build-sys: move slirp as git submodule project

The slirp project is now hosted on freedesktop at:
https://gitlab.freedesktop.org/slirp.

The libslirp source was extracted from qemu/slirp filtered through
clang-format (available in project tree). The qemu slirp directory can
be swapped by a git submodule.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20190424110041.8175-3-marcandre.lureau@redhat.com>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

62 files changed, 13 insertions, 15725 deletions

diff --git a/.gitmodules b/.gitmodules
index ceafb0e..aa77ce6 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -52,3 +52,6 @@
 [submodule "roms/edk2"]
 	path = roms/edk2
 	url = https://github.com/tianocore/edk2.git
+[submodule "slirp"]
+	path = slirp
+	url = https://gitlab.freedesktop.org/slirp/libslirp.git
diff --git a/configure b/configure
index 60719dd..c60a43d 100755
--- a/configure
+++ b/configure
@@ -1115,6 +1115,8 @@ for opt do
   ;;
   --disable-slirp) slirp="no"
   ;;
+  --enable-slirp=git) slirp="git"
+  ;;
   --enable-slirp=system) slirp="system"
   ;;
   --disable-vde) vde="no"
@@ -5885,6 +5887,8 @@ case "$slirp" in
   "" | yes)
     if $pkg_config slirp; then
       slirp=system
+    elif test -e "${source_path}/.git" && test $git_update = 'yes' ; then
+      slirp=git
     elif test -e "${source_path}/slirp/Makefile" ; then
       slirp=internal
     elif test -z "$slirp" ; then
@@ -5902,7 +5906,10 @@ case "$slirp" in
 esac
 
 case "$slirp" in
-  internal)
+  git | internal)
+    if test "$slirp" = git; then
+      git_submodules="${git_submodules} slirp"
+    fi
     mkdir -p slirp
     slirp_cflags="-I\$(SRC_PATH)/slirp/src -I\$(BUILD_DIR)/slirp/src"
     slirp_libs="-L\$(BUILD_DIR)/slirp -lslirp"
@@ -6565,7 +6572,7 @@ if test "$slirp" != "no"; then
   echo "SLIRP_CFLAGS=$slirp_cflags" >> $config_host_mak
   echo "SLIRP_LIBS=$slirp_libs" >> $config_host_mak
 fi
-if [ "$slirp" = "internal" ]; then
+if [ "$slirp" = "git" -o "$slirp" = "internal" ]; then
     echo "config-host.h: subdir-slirp" >> $config_host_mak
 fi
 if test "$vde" = "yes" ; then
diff --git a/scripts/archive-source.sh b/scripts/archive-source.sh
index d3a88f7..8b89948 100755
--- a/scripts/archive-source.sh
+++ b/scripts/archive-source.sh
@@ -26,7 +26,7 @@ vroot_dir="${tar_file}.vroot"
 # independent of what the developer currently has initialized
 # in their checkout, because the build environment is completely
 # different to the host OS.
-submodules="dtc ui/keycodemapdb tests/fp/berkeley-softfloat-3 tests/fp/berkeley-testfloat-3"
+submodules="dtc slirp ui/keycodemapdb tests/fp/berkeley-softfloat-3 tests/fp/berkeley-testfloat-3"
 
 trap "status=$?; rm -rf \"$list_file\" \"$vroot_dir\"; exit \$status" 0 1 2 3 15
 
diff --git a/slirp b/slirp
new file mode 160000
+Subproject 59a1b1f165458c2acb7ff0525b543945f741622
diff --git a/slirp/COPYRIGHT b/slirp/COPYRIGHT
deleted file mode 100644
index ed49512..0000000
--- a/slirp/COPYRIGHT
+++ /dev/null
@@ -1,62 +0,0 @@
-Slirp was written by Danny Gasparovski.
-Copyright (c), 1995,1996 All Rights Reserved.
-
-Slirp is free software; "free" as in you don't have to pay for it, and you
-are free to do whatever you want with it.  I do not accept any donations,
-monetary or otherwise, for Slirp.  Instead, I would ask you to pass this
-potential donation to your favorite charity.  In fact, I encourage
-*everyone* who finds Slirp useful to make a small donation to their
-favorite charity (for example, GreenPeace).  This is not a requirement, but
-a suggestion from someone who highly values the service they provide.
-
-The copyright terms and conditions:
-
----BEGIN---
-
- Copyright (c) 1995,1996 Danny Gasparovski.  All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
- 1. Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
- 2. Redistributions in binary form must reproduce the above copyright
-    notice, this list of conditions and the following disclaimer in the
-    documentation and/or other materials provided with the distribution.
- 3. Neither the name of the copyright holder nor the names of its
-    contributors may be used to endorse or promote products derived
-    from this software without specific prior written permission.
-
- THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
- INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
- AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
- DANNY GASPAROVSKI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
----END---
-
-This basically means you can do anything you want with the software, except
-1) call it your own, and 2) claim warranty on it.  There is no warranty for
-this software.  None.  Nada.  If you lose a million dollars while using
-Slirp, that's your loss not mine.  So, ***USE AT YOUR OWN RISK!***.
-
-If these conditions cannot be met due to legal restrictions (E.g. where it
-is against the law to give out Software without warranty), you must cease
-using the software and delete all copies you have.
-
-Slirp uses code that is copyrighted by the following people/organizations:
-
-Juha Pirkola.
-Gregory M. Christy.
-The Regents of the University of California.
-Carnegie Mellon University.
-The Australian National University.
-RSA Data Security, Inc.
-
-Please read the top of each source file for the details on the various
-copyrights.
diff --git a/slirp/Makefile b/slirp/Makefile
deleted file mode 100644
index 6d48f62..0000000
--- a/slirp/Makefile
+++ /dev/null
@@ -1,47 +0,0 @@
-ROOT_DIR := $(shell dirname $(realpath $(lastword $(MAKEFILE_LIST))))
-BUILD_DIR ?= .
-
-LIBSLIRP = $(BUILD_DIR)/libslirp.a
-
-all: $(LIBSLIRP)
-
-SRCS := $(wildcard src/*.c)
-OBJS := $(SRCS:%.c=$(BUILD_DIR)/%.o)
-DEPS := $(OBJS:%.o=%.d)
-
-INC_DIRS := $(BUILD_DIR)/src
-INC_FLAGS := $(addprefix -I,$(INC_DIRS))
-
-override CFLAGS +=					\
-	-DG_LOG_DOMAIN='"Slirp"'			\
-	$(shell $(PKG_CONFIG) --cflags glib-2.0)	\
-	$(INC_FLAGS)					\
-	-MMD -MP
-override LDFLAGS += $(shell $(PKG_CONFIG) --libs glib-2.0)
-
-$(LIBSLIRP): $(OBJS)
-
-.PHONY: clean
-
-clean:
-	rm -r $(OBJS) $(DEPS) $(LIBSLIRP)
-
-$(BUILD_DIR)/src/%.o: $(ROOT_DIR)/src/%.c
-	@$(MKDIR_P) $(dir $@)
-	$(call quiet-command,$(CC) $(CFLAGS) -c -o $@ $<,"CC","$@")
-
-%.a:
-	$(call quiet-command,rm -f $@ && $(AR) rcs $@ $^,"AR","$@")
-
-PKG_CONFIG ?= pkg-config
-MKDIR_P ?= mkdir -p
-quiet-command-run = $(if $(V),,$(if $2,printf "  %-7s %s\n" $2 $3 && ))$1
-quiet-@ = $(if $(V),,@)
-quiet-command = $(quiet-@)$(call quiet-command-run,$1,$2,$3)
-
-print-%:
-	@echo '$*=$($*)'
-
-.SUFFIXES:
-
--include $(DEPS)
diff --git a/slirp/src/arp_table.c b/slirp/src/arp_table.c
deleted file mode 100644
index 9d7a59e..0000000
--- a/slirp/src/arp_table.c
+++ /dev/null
@@ -1,92 +0,0 @@
-/* SPDX-License-Identifier: MIT */
-/*
- * ARP table
- *
- * Copyright (c) 2011 AdaCore
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-#include "slirp.h"
-
-#include <string.h>
-
-void arp_table_add(Slirp *slirp, uint32_t ip_addr, uint8_t ethaddr[ETH_ALEN])
-{
-    const uint32_t broadcast_addr =
-        ~slirp->vnetwork_mask.s_addr | slirp->vnetwork_addr.s_addr;
-    ArpTable *arptbl = &slirp->arp_table;
-    int i;
-
-    DEBUG_CALL("arp_table_add");
-    DEBUG_ARG("ip = %s", inet_ntoa((struct in_addr){.s_addr = ip_addr}));
-    DEBUG_ARG("hw addr = %02x:%02x:%02x:%02x:%02x:%02x",
-              ethaddr[0], ethaddr[1], ethaddr[2],
-              ethaddr[3], ethaddr[4], ethaddr[5]);
-
-    if (ip_addr == 0 || ip_addr == 0xffffffff || ip_addr == broadcast_addr) {
-        /* Do not register broadcast addresses */
-        return;
-    }
-
-    /* Search for an entry */
-    for (i = 0; i < ARP_TABLE_SIZE; i++) {
-        if (arptbl->table[i].ar_sip == ip_addr) {
-            /* Update the entry */
-            memcpy(arptbl->table[i].ar_sha, ethaddr, ETH_ALEN);
-            return;
-        }
-    }
-
-    /* No entry found, create a new one */
-    arptbl->table[arptbl->next_victim].ar_sip = ip_addr;
-    memcpy(arptbl->table[arptbl->next_victim].ar_sha,  ethaddr, ETH_ALEN);
-    arptbl->next_victim = (arptbl->next_victim + 1) % ARP_TABLE_SIZE;
-}
-
-bool arp_table_search(Slirp *slirp, uint32_t ip_addr,
-                      uint8_t out_ethaddr[ETH_ALEN])
-{
-    const uint32_t broadcast_addr =
-        ~slirp->vnetwork_mask.s_addr | slirp->vnetwork_addr.s_addr;
-    ArpTable *arptbl = &slirp->arp_table;
-    int i;
-
-    DEBUG_CALL("arp_table_search");
-    DEBUG_ARG("ip = %s", inet_ntoa((struct in_addr){.s_addr = ip_addr}));
-
-    /* If broadcast address */
-    if (ip_addr == 0xffffffff || ip_addr == broadcast_addr) {
-        /* return Ethernet broadcast address */
-        memset(out_ethaddr, 0xff, ETH_ALEN);
-        return 1;
-    }
-
-    for (i = 0; i < ARP_TABLE_SIZE; i++) {
-        if (arptbl->table[i].ar_sip == ip_addr) {
-            memcpy(out_ethaddr, arptbl->table[i].ar_sha,  ETH_ALEN);
-            DEBUG_ARG("found hw addr = %02x:%02x:%02x:%02x:%02x:%02x",
-                      out_ethaddr[0], out_ethaddr[1], out_ethaddr[2],
-                      out_ethaddr[3], out_ethaddr[4], out_ethaddr[5]);
-            return 1;
-        }
-    }
-
-    return 0;
-}
diff --git a/slirp/src/bootp.c b/slirp/src/bootp.c
deleted file mode 100644
index b208e3b..0000000
--- a/slirp/src/bootp.c
+++ /dev/null
@@ -1,371 +0,0 @@
-/* SPDX-License-Identifier: MIT */
-/*
- * QEMU BOOTP/DHCP server
- *
- * Copyright (c) 2004 Fabrice Bellard
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-#include "slirp.h"
-
-#if defined(_WIN32)
-/* Windows ntohl() returns an u_long value.
- * Add a type cast to match the format strings. */
-# define ntohl(n) ((uint32_t)ntohl(n))
-#endif
-
-/* XXX: only DHCP is supported */
-
-#define LEASE_TIME (24 * 3600)
-
-static const uint8_t rfc1533_cookie[] = { RFC1533_COOKIE };
-
-#define DPRINTF(fmt, ...) DEBUG_CALL(fmt, ##__VA_ARGS__)
-
-static BOOTPClient *get_new_addr(Slirp *slirp, struct in_addr *paddr,
-                                 const uint8_t *macaddr)
-{
-    BOOTPClient *bc;
-    int i;
-
-    for(i = 0; i < NB_BOOTP_CLIENTS; i++) {
-        bc = &slirp->bootp_clients[i];
-        if (!bc->allocated || !memcmp(macaddr, bc->macaddr, 6))
-            goto found;
-    }
-    return NULL;
- found:
-    bc = &slirp->bootp_clients[i];
-    bc->allocated = 1;
-    paddr->s_addr = slirp->vdhcp_startaddr.s_addr + htonl(i);
-    return bc;
-}
-
-static BOOTPClient *request_addr(Slirp *slirp, const struct in_addr *paddr,
-                                 const uint8_t *macaddr)
-{
-    uint32_t req_addr = ntohl(paddr->s_addr);
-    uint32_t dhcp_addr = ntohl(slirp->vdhcp_startaddr.s_addr);
-    BOOTPClient *bc;
-
-    if (req_addr >= dhcp_addr &&
-        req_addr < (dhcp_addr + NB_BOOTP_CLIENTS)) {
-        bc = &slirp->bootp_clients[req_addr - dhcp_addr];
-        if (!bc->allocated || !memcmp(macaddr, bc->macaddr, 6)) {
-            bc->allocated = 1;
-            return bc;
-        }
-    }
-    return NULL;
-}
-
-static BOOTPClient *find_addr(Slirp *slirp, struct in_addr *paddr,
-                              const uint8_t *macaddr)
-{
-    BOOTPClient *bc;
-    int i;
-
-    for(i = 0; i < NB_BOOTP_CLIENTS; i++) {
-        if (!memcmp(macaddr, slirp->bootp_clients[i].macaddr, 6))
-            goto found;
-    }
-    return NULL;
- found:
-    bc = &slirp->bootp_clients[i];
-    bc->allocated = 1;
-    paddr->s_addr = slirp->vdhcp_startaddr.s_addr + htonl(i);
-    return bc;
-}
-
-static void dhcp_decode(const struct bootp_t *bp, int *pmsg_type,
-                        struct in_addr *preq_addr)
-{
-    const uint8_t *p, *p_end;
-    int len, tag;
-
-    *pmsg_type = 0;
-    preq_addr->s_addr = htonl(0L);
-
-    p = bp->bp_vend;
-    p_end = p + DHCP_OPT_LEN;
-    if (memcmp(p, rfc1533_cookie, 4) != 0)
-        return;
-    p += 4;
-    while (p < p_end) {
-        tag = p[0];
-        if (tag == RFC1533_PAD) {
-            p++;
-        } else if (tag == RFC1533_END) {
-            break;
-        } else {
-            p++;
-            if (p >= p_end)
-                break;
-            len = *p++;
-            if (p + len > p_end) {
-                break;
-            }
-            DPRINTF("dhcp: tag=%d len=%d\n", tag, len);
-
-            switch(tag) {
-            case RFC2132_MSG_TYPE:
-                if (len >= 1)
-                    *pmsg_type = p[0];
-                break;
-            case RFC2132_REQ_ADDR:
-                if (len >= 4) {
-                    memcpy(&(preq_addr->s_addr), p, 4);
-                }
-                break;
-            default:
-                break;
-            }
-            p += len;
-        }
-    }
-    if (*pmsg_type == DHCPREQUEST && preq_addr->s_addr == htonl(0L) &&
-        bp->bp_ciaddr.s_addr) {
-        memcpy(&(preq_addr->s_addr), &bp->bp_ciaddr, 4);
-    }
-}
-
-static void bootp_reply(Slirp *slirp, const struct bootp_t *bp)
-{
-    BOOTPClient *bc = NULL;
-    struct mbuf *m;
-    struct bootp_t *rbp;
-    struct sockaddr_in saddr, daddr;
-    struct in_addr preq_addr;
-    int dhcp_msg_type, val;
-    uint8_t *q;
-    uint8_t *end;
-    uint8_t client_ethaddr[ETH_ALEN];
-
-    /* extract exact DHCP msg type */
-    dhcp_decode(bp, &dhcp_msg_type, &preq_addr);
-    DPRINTF("bootp packet op=%d msgtype=%d", bp->bp_op, dhcp_msg_type);
-    if (preq_addr.s_addr != htonl(0L))
-        DPRINTF(" req_addr=%08" PRIx32 "\n", ntohl(preq_addr.s_addr));
-    else {
-        DPRINTF("\n");
-    }
-
-    if (dhcp_msg_type == 0)
-        dhcp_msg_type = DHCPREQUEST; /* Force reply for old BOOTP clients */
-
-    if (dhcp_msg_type != DHCPDISCOVER &&
-        dhcp_msg_type != DHCPREQUEST)
-        return;
-
-    /* Get client's hardware address from bootp request */
-    memcpy(client_ethaddr, bp->bp_hwaddr, ETH_ALEN);
-
-    m = m_get(slirp);
-    if (!m) {
-        return;
-    }
-    m->m_data += IF_MAXLINKHDR;
-    rbp = (struct bootp_t *)m->m_data;
-    m->m_data += sizeof(struct udpiphdr);
-    memset(rbp, 0, sizeof(struct bootp_t));
-
-    if (dhcp_msg_type == DHCPDISCOVER) {
-        if (preq_addr.s_addr != htonl(0L)) {
-            bc = request_addr(slirp, &preq_addr, client_ethaddr);
-            if (bc) {
-                daddr.sin_addr = preq_addr;
-            }
-        }
-        if (!bc) {
-         new_addr:
-            bc = get_new_addr(slirp, &daddr.sin_addr, client_ethaddr);
-            if (!bc) {
-                DPRINTF("no address left\n");
-                return;
-            }
-        }
-        memcpy(bc->macaddr, client_ethaddr, ETH_ALEN);
-    } else if (preq_addr.s_addr != htonl(0L)) {
-        bc = request_addr(slirp, &preq_addr, client_ethaddr);
-        if (bc) {
-            daddr.sin_addr = preq_addr;
-            memcpy(bc->macaddr, client_ethaddr, ETH_ALEN);
-        } else {
-            /* DHCPNAKs should be sent to broadcast */
-            daddr.sin_addr.s_addr = 0xffffffff;
-        }
-    } else {
-        bc = find_addr(slirp, &daddr.sin_addr, bp->bp_hwaddr);
-        if (!bc) {
-            /* if never assigned, behaves as if it was already
-               assigned (windows fix because it remembers its address) */
-            goto new_addr;
-        }
-    }
-
-    /* Update ARP table for this IP address */
-    arp_table_add(slirp, daddr.sin_addr.s_addr, client_ethaddr);
-
-    saddr.sin_addr = slirp->vhost_addr;
-    saddr.sin_port = htons(BOOTP_SERVER);
-
-    daddr.sin_port = htons(BOOTP_CLIENT);
-
-    rbp->bp_op = BOOTP_REPLY;
-    rbp->bp_xid = bp->bp_xid;
-    rbp->bp_htype = 1;
-    rbp->bp_hlen = 6;
-    memcpy(rbp->bp_hwaddr, bp->bp_hwaddr, ETH_ALEN);
-
-    rbp->bp_yiaddr = daddr.sin_addr; /* Client IP address */
-    rbp->bp_siaddr = saddr.sin_addr; /* Server IP address */
-
-    q = rbp->bp_vend;
-    end = (uint8_t *)&rbp[1];
-    memcpy(q, rfc1533_cookie, 4);
-    q += 4;
-
-    if (bc) {
-        DPRINTF("%s addr=%08" PRIx32 "\n",
-                (dhcp_msg_type == DHCPDISCOVER) ? "offered" : "ack'ed",
-                ntohl(daddr.sin_addr.s_addr));
-
-        if (dhcp_msg_type == DHCPDISCOVER) {
-            *q++ = RFC2132_MSG_TYPE;
-            *q++ = 1;
-            *q++ = DHCPOFFER;
-        } else /* DHCPREQUEST */ {
-            *q++ = RFC2132_MSG_TYPE;
-            *q++ = 1;
-            *q++ = DHCPACK;
-        }
-
-        if (slirp->bootp_filename)
-            snprintf((char *)rbp->bp_file, sizeof(rbp->bp_file), "%s",
-                     slirp->bootp_filename);
-
-        *q++ = RFC2132_SRV_ID;
-        *q++ = 4;
-        memcpy(q, &saddr.sin_addr, 4);
-        q += 4;
-
-        *q++ = RFC1533_NETMASK;
-        *q++ = 4;
-        memcpy(q, &slirp->vnetwork_mask, 4);
-        q += 4;
-
-        if (!slirp->restricted) {
-            *q++ = RFC1533_GATEWAY;
-            *q++ = 4;
-            memcpy(q, &saddr.sin_addr, 4);
-            q += 4;
-
-            *q++ = RFC1533_DNS;
-            *q++ = 4;
-            memcpy(q, &slirp->vnameserver_addr, 4);
-            q += 4;
-        }
-
-        *q++ = RFC2132_LEASE_TIME;
-        *q++ = 4;
-        val = htonl(LEASE_TIME);
-        memcpy(q, &val, 4);
-        q += 4;
-
-        if (*slirp->client_hostname) {
-            val = strlen(slirp->client_hostname);
-            if (q + val + 2 >= end) {
-                g_warning("DHCP packet size exceeded, "
-                    "omitting host name option.");
-            } else {
-                *q++ = RFC1533_HOSTNAME;
-                *q++ = val;
-                memcpy(q, slirp->client_hostname, val);
-                q += val;
-            }
-        }
-
-        if (slirp->vdomainname) {
-            val = strlen(slirp->vdomainname);
-            if (q + val + 2 >= end) {
-                g_warning("DHCP packet size exceeded, "
-                    "omitting domain name option.");
-            } else {
-                *q++ = RFC1533_DOMAINNAME;
-                *q++ = val;
-                memcpy(q, slirp->vdomainname, val);
-                q += val;
-            }
-        }
-
-        if (slirp->tftp_server_name) {
-            val = strlen(slirp->tftp_server_name);
-            if (q + val + 2 >= end) {
-                g_warning("DHCP packet size exceeded, "
-                    "omitting tftp-server-name option.");
-            } else {
-                *q++ = RFC2132_TFTP_SERVER_NAME;
-                *q++ = val;
-                memcpy(q, slirp->tftp_server_name, val);
-                q += val;
-            }
-        }
-
-        if (slirp->vdnssearch) {
-            val = slirp->vdnssearch_len;
-            if (q + val >= end) {
-                g_warning("DHCP packet size exceeded, "
-                    "omitting domain-search option.");
-            } else {
-                memcpy(q, slirp->vdnssearch, val);
-                q += val;
-            }
-        }
-    } else {
-        static const char nak_msg[] = "requested address not available";
-
-        DPRINTF("nak'ed addr=%08" PRIx32 "\n", ntohl(preq_addr.s_addr));
-
-        *q++ = RFC2132_MSG_TYPE;
-        *q++ = 1;
-        *q++ = DHCPNAK;
-
-        *q++ = RFC2132_MESSAGE;
-        *q++ = sizeof(nak_msg) - 1;
-        memcpy(q, nak_msg, sizeof(nak_msg) - 1);
-        q += sizeof(nak_msg) - 1;
-    }
-    assert(q < end);
-    *q = RFC1533_END;
-
-    daddr.sin_addr.s_addr = 0xffffffffu;
-
-    m->m_len = sizeof(struct bootp_t) -
-        sizeof(struct ip) - sizeof(struct udphdr);
-    udp_output(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
-}
-
-void bootp_input(struct mbuf *m)
-{
-    struct bootp_t *bp = mtod(m, struct bootp_t *);
-
-    if (bp->bp_op == BOOTP_REQUEST) {
-        bootp_reply(m->slirp, bp);
-    }
-}
diff --git a/slirp/src/bootp.h b/slirp/src/bootp.h
deleted file mode 100644
index d881ad6..0000000
--- a/slirp/src/bootp.h
+++ /dev/null
@@ -1,129 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/* bootp/dhcp defines */
-
-#ifndef SLIRP_BOOTP_H
-#define SLIRP_BOOTP_H
-
-#define BOOTP_SERVER	67
-#define BOOTP_CLIENT	68
-
-#define BOOTP_REQUEST	1
-#define BOOTP_REPLY	2
-
-#define RFC1533_COOKIE		99, 130, 83, 99
-#define RFC1533_PAD		0
-#define RFC1533_NETMASK		1
-#define RFC1533_TIMEOFFSET	2
-#define RFC1533_GATEWAY		3
-#define RFC1533_TIMESERVER	4
-#define RFC1533_IEN116NS	5
-#define RFC1533_DNS		6
-#define RFC1533_LOGSERVER	7
-#define RFC1533_COOKIESERVER	8
-#define RFC1533_LPRSERVER	9
-#define RFC1533_IMPRESSSERVER	10
-#define RFC1533_RESOURCESERVER	11
-#define RFC1533_HOSTNAME	12
-#define RFC1533_BOOTFILESIZE	13
-#define RFC1533_MERITDUMPFILE	14
-#define RFC1533_DOMAINNAME	15
-#define RFC1533_SWAPSERVER	16
-#define RFC1533_ROOTPATH	17
-#define RFC1533_EXTENSIONPATH	18
-#define RFC1533_IPFORWARDING	19
-#define RFC1533_IPSOURCEROUTING	20
-#define RFC1533_IPPOLICYFILTER	21
-#define RFC1533_IPMAXREASSEMBLY	22
-#define RFC1533_IPTTL		23
-#define RFC1533_IPMTU		24
-#define RFC1533_IPMTUPLATEAU	25
-#define RFC1533_INTMTU		26
-#define RFC1533_INTLOCALSUBNETS	27
-#define RFC1533_INTBROADCAST	28
-#define RFC1533_INTICMPDISCOVER	29
-#define RFC1533_INTICMPRESPOND	30
-#define RFC1533_INTROUTEDISCOVER 31
-#define RFC1533_INTROUTESOLICIT	32
-#define RFC1533_INTSTATICROUTES	33
-#define RFC1533_LLTRAILERENCAP	34
-#define RFC1533_LLARPCACHETMO	35
-#define RFC1533_LLETHERNETENCAP	36
-#define RFC1533_TCPTTL		37
-#define RFC1533_TCPKEEPALIVETMO	38
-#define RFC1533_TCPKEEPALIVEGB	39
-#define RFC1533_NISDOMAIN	40
-#define RFC1533_NISSERVER	41
-#define RFC1533_NTPSERVER	42
-#define RFC1533_VENDOR		43
-#define RFC1533_NBNS		44
-#define RFC1533_NBDD		45
-#define RFC1533_NBNT		46
-#define RFC1533_NBSCOPE		47
-#define RFC1533_XFS		48
-#define RFC1533_XDM		49
-
-#define RFC2132_REQ_ADDR	50
-#define RFC2132_LEASE_TIME      51
-#define RFC2132_MSG_TYPE	53
-#define RFC2132_SRV_ID		54
-#define RFC2132_PARAM_LIST	55
-#define RFC2132_MESSAGE		56
-#define RFC2132_MAX_SIZE	57
-#define RFC2132_RENEWAL_TIME    58
-#define RFC2132_REBIND_TIME     59
-#define RFC2132_TFTP_SERVER_NAME 66
-
-#define DHCPDISCOVER		1
-#define DHCPOFFER		2
-#define DHCPREQUEST		3
-#define DHCPACK			5
-#define DHCPNAK			6
-
-#define RFC1533_VENDOR_MAJOR	0
-#define RFC1533_VENDOR_MINOR	0
-
-#define RFC1533_VENDOR_MAGIC	128
-#define RFC1533_VENDOR_ADDPARM	129
-#define	RFC1533_VENDOR_ETHDEV	130
-#define RFC1533_VENDOR_HOWTO    132
-#define RFC1533_VENDOR_MNUOPTS	160
-#define RFC1533_VENDOR_SELECTION 176
-#define RFC1533_VENDOR_MOTD	184
-#define RFC1533_VENDOR_NUMOFMOTD 8
-#define RFC1533_VENDOR_IMG	192
-#define RFC1533_VENDOR_NUMOFIMG	16
-
-#define RFC1533_END		255
-#define BOOTP_VENDOR_LEN	64
-#define DHCP_OPT_LEN		312
-
-struct bootp_t {
-    struct ip ip;
-    struct udphdr udp;
-    uint8_t bp_op;
-    uint8_t bp_htype;
-    uint8_t bp_hlen;
-    uint8_t bp_hops;
-    uint32_t bp_xid;
-    uint16_t bp_secs;
-    uint16_t unused;
-    struct in_addr bp_ciaddr;
-    struct in_addr bp_yiaddr;
-    struct in_addr bp_siaddr;
-    struct in_addr bp_giaddr;
-    uint8_t bp_hwaddr[16];
-    uint8_t bp_sname[64];
-    uint8_t bp_file[128];
-    uint8_t bp_vend[DHCP_OPT_LEN];
-};
-
-typedef struct {
-    uint16_t allocated;
-    uint8_t macaddr[6];
-} BOOTPClient;
-
-#define NB_BOOTP_CLIENTS 16
-
-void bootp_input(struct mbuf *m);
-
-#endif
diff --git a/slirp/src/cksum.c b/slirp/src/cksum.c
deleted file mode 100644
index 9599f6a..0000000
--- a/slirp/src/cksum.c
+++ /dev/null
@@ -1,161 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1988, 1992, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)in_cksum.c	8.1 (Berkeley) 6/10/93
- * in_cksum.c,v 1.2 1994/08/02 07:48:16 davidg Exp
- */
-
-#include "slirp.h"
-
-/*
- * Checksum routine for Internet Protocol family headers (Portable Version).
- *
- * This routine is very heavily used in the network
- * code and should be modified for each CPU to be as fast as possible.
- *
- * XXX Since we will never span more than 1 mbuf, we can optimise this
- */
-
-#define ADDCARRY(x)  (x > 65535 ? x -= 65535 : x)
-#define REDUCE {l_util.l = sum; sum = l_util.s[0] + l_util.s[1];        \
-        (void)ADDCARRY(sum);}
-
-int cksum(struct mbuf *m, int len)
-{
-	register uint16_t *w;
-	register int sum = 0;
-	register int mlen = 0;
-	int byte_swapped = 0;
-
-	union {
-		uint8_t  c[2];
-		uint16_t s;
-	} s_util;
-	union {
-		uint16_t s[2];
-		uint32_t l;
-	} l_util;
-
-	if (m->m_len == 0)
-	   goto cont;
-	w = mtod(m, uint16_t *);
-
-	mlen = m->m_len;
-
-	if (len < mlen)
-	   mlen = len;
-	len -= mlen;
-	/*
-	 * Force to even boundary.
-	 */
-	if ((1 & (uintptr_t)w) && (mlen > 0)) {
-		REDUCE;
-		sum <<= 8;
-		s_util.c[0] = *(uint8_t *)w;
-		w = (uint16_t *)((int8_t *)w + 1);
-		mlen--;
-		byte_swapped = 1;
-	}
-	/*
-	 * Unroll the loop to make overhead from
-	 * branches &c small.
-	 */
-	while ((mlen -= 32) >= 0) {
-		sum += w[0]; sum += w[1]; sum += w[2]; sum += w[3];
-		sum += w[4]; sum += w[5]; sum += w[6]; sum += w[7];
-		sum += w[8]; sum += w[9]; sum += w[10]; sum += w[11];
-		sum += w[12]; sum += w[13]; sum += w[14]; sum += w[15];
-		w += 16;
-	}
-	mlen += 32;
-	while ((mlen -= 8) >= 0) {
-		sum += w[0]; sum += w[1]; sum += w[2]; sum += w[3];
-		w += 4;
-	}
-	mlen += 8;
-	if (mlen == 0 && byte_swapped == 0)
-	   goto cont;
-	REDUCE;
-	while ((mlen -= 2) >= 0) {
-		sum += *w++;
-	}
-
-	if (byte_swapped) {
-		REDUCE;
-		sum <<= 8;
-		if (mlen == -1) {
-			s_util.c[1] = *(uint8_t *)w;
-			sum += s_util.s;
-			mlen = 0;
-		} else
-
-		   mlen = -1;
-	} else if (mlen == -1)
-	   s_util.c[0] = *(uint8_t *)w;
-
-cont:
-	if (len) {
-		DEBUG_ERROR("cksum: out of data");
-		DEBUG_ERROR(" len = %d", len);
-	}
-	if (mlen == -1) {
-		/* The last mbuf has odd # of bytes. Follow the
-		 standard (the odd byte may be shifted left by 8 bits
-			   or not as determined by endian-ness of the machine) */
-		s_util.c[1] = 0;
-		sum += s_util.s;
-	}
-	REDUCE;
-	return (~sum & 0xffff);
-}
-
-int ip6_cksum(struct mbuf *m)
-{
-    /* TODO: Optimize this by being able to pass the ip6_pseudohdr to cksum
-     * separately from the mbuf */
-    struct ip6 save_ip, *ip = mtod(m, struct ip6 *);
-    struct ip6_pseudohdr *ih = mtod(m, struct ip6_pseudohdr *);
-    int sum;
-
-    save_ip = *ip;
-
-    ih->ih_src = save_ip.ip_src;
-    ih->ih_dst = save_ip.ip_dst;
-    ih->ih_pl = htonl((uint32_t)ntohs(save_ip.ip_pl));
-    ih->ih_zero_hi = 0;
-    ih->ih_zero_lo = 0;
-    ih->ih_nh = save_ip.ip_nh;
-
-    sum = cksum(m, ((int)sizeof(struct ip6_pseudohdr))
-                    + ntohl(ih->ih_pl));
-
-    *ip = save_ip;
-
-    return sum;
-}
diff --git a/slirp/src/debug.h b/slirp/src/debug.h
deleted file mode 100644
index c95fd8f..0000000
--- a/slirp/src/debug.h
+++ /dev/null
@@ -1,46 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1995 Danny Gasparovski.
- */
-
-#ifndef DEBUG_H_
-#define DEBUG_H_
-
-#define DBG_CALL (1 << 0)
-#define DBG_MISC (1 << 1)
-#define DBG_ERROR (1 << 2)
-#define DBG_TFTP (1 << 3)
-
-extern int slirp_debug;
-
-#define DEBUG_CALL(fmt, ...) do {               \
-    if (G_UNLIKELY(slirp_debug & DBG_CALL)) {   \
-        g_debug(fmt "...", ##__VA_ARGS__);      \
-    }                                           \
-} while (0)
-
-#define DEBUG_ARG(fmt, ...) do {                \
-    if (G_UNLIKELY(slirp_debug & DBG_CALL)) {   \
-        g_debug(" " fmt, ##__VA_ARGS__);        \
-    }                                           \
-} while (0)
-
-#define DEBUG_MISC(fmt, ...) do {               \
-    if (G_UNLIKELY(slirp_debug & DBG_MISC)) {   \
-        g_debug(fmt, ##__VA_ARGS__);            \
-    }                                           \
-} while (0)
-
-#define DEBUG_ERROR(fmt, ...) do {              \
-    if (G_UNLIKELY(slirp_debug & DBG_ERROR)) {  \
-        g_debug(fmt, ##__VA_ARGS__);            \
-    }                                           \
-} while (0)
-
-#define DEBUG_TFTP(fmt, ...) do {               \
-    if (G_UNLIKELY(slirp_debug & DBG_TFTP)) {   \
-        g_debug(fmt, ##__VA_ARGS__);            \
-    }                                           \
-} while (0)
-
-#endif /* DEBUG_H_ */
diff --git a/slirp/src/dhcpv6.c b/slirp/src/dhcpv6.c
deleted file mode 100644
index 3c8f420..0000000
--- a/slirp/src/dhcpv6.c
+++ /dev/null
@@ -1,224 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * SLIRP stateless DHCPv6
- *
- * We only support stateless DHCPv6, e.g. for network booting.
- * See RFC 3315, RFC 3736, RFC 3646 and RFC 5970 for details.
- *
- * Copyright 2016 Thomas Huth, Red Hat Inc.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above
- * copyright notice, this list of conditions and the following
- * disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * 3. Neither the name of the copyright holder nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
- * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "slirp.h"
-#include "dhcpv6.h"
-
-/* DHCPv6 message types */
-#define MSGTYPE_REPLY        7
-#define MSGTYPE_INFO_REQUEST 11
-
-/* DHCPv6 option types */
-#define OPTION_CLIENTID      1
-#define OPTION_IAADDR        5
-#define OPTION_ORO           6
-#define OPTION_DNS_SERVERS   23
-#define OPTION_BOOTFILE_URL  59
-
-struct requested_infos {
-    uint8_t *client_id;
-    int client_id_len;
-    bool want_dns;
-    bool want_boot_url;
-};
-
-/**
- * Analyze the info request message sent by the client to see what data it
- * provided and what it wants to have. The information is gathered in the
- * "requested_infos" struct. Note that client_id (if provided) points into
- * the odata region, thus the caller must keep odata valid as long as it
- * needs to access the requested_infos struct.
- */
-static int dhcpv6_parse_info_request(Slirp *slirp, uint8_t *odata, int olen,
-                                     struct requested_infos *ri)
-{
-    int i, req_opt;
-
-    while (olen > 4) {
-        /* Parse one option */
-        int option = odata[0] << 8 | odata[1];
-        int len = odata[2] << 8 | odata[3];
-
-        if (len + 4 > olen) {
-            slirp->cb->guest_error("Guest sent bad DHCPv6 packet!", slirp->opaque);
-            return -E2BIG;
-        }
-
-        switch (option) {
-        case OPTION_IAADDR:
-            /* According to RFC3315, we must discard requests with IA option */
-            return -EINVAL;
-        case OPTION_CLIENTID:
-            if (len > 256) {
-                /* Avoid very long IDs which could cause problems later */
-                return -E2BIG;
-            }
-            ri->client_id = odata + 4;
-            ri->client_id_len = len;
-            break;
-        case OPTION_ORO:        /* Option request option */
-            if (len & 1) {
-                return -EINVAL;
-            }
-            /* Check which options the client wants to have */
-            for (i = 0; i < len; i += 2) {
-                req_opt = odata[4 + i] << 8 | odata[4 + i + 1];
-                switch (req_opt) {
-                case OPTION_DNS_SERVERS:
-                    ri->want_dns = true;
-                    break;
-                case OPTION_BOOTFILE_URL:
-                    ri->want_boot_url = true;
-                    break;
-                default:
-                    DEBUG_MISC("dhcpv6: Unsupported option request %d",
-                               req_opt);
-                }
-            }
-            break;
-        default:
-            DEBUG_MISC("dhcpv6 info req: Unsupported option %d, len=%d",
-                       option, len);
-        }
-
-        odata += len + 4;
-        olen -= len + 4;
-    }
-
-    return 0;
-}
-
-
-/**
- * Handle information request messages
- */
-static void dhcpv6_info_request(Slirp *slirp, struct sockaddr_in6 *srcsas,
-                                uint32_t xid, uint8_t *odata, int olen)
-{
-    struct requested_infos ri = { NULL };
-    struct sockaddr_in6 sa6, da6;
-    struct mbuf *m;
-    uint8_t *resp;
-
-    if (dhcpv6_parse_info_request(slirp, odata, olen, &ri) < 0) {
-        return;
-    }
-
-    m = m_get(slirp);
-    if (!m) {
-        return;
-    }
-    memset(m->m_data, 0, m->m_size);
-    m->m_data += IF_MAXLINKHDR;
-    resp = (uint8_t *)m->m_data + sizeof(struct ip6) + sizeof(struct udphdr);
-
-    /* Fill in response */
-    *resp++ = MSGTYPE_REPLY;
-    *resp++ = (uint8_t)(xid >> 16);
-    *resp++ = (uint8_t)(xid >> 8);
-    *resp++ = (uint8_t)xid;
-
-    if (ri.client_id) {
-        *resp++ = OPTION_CLIENTID >> 8;         /* option-code high byte */
-        *resp++ = OPTION_CLIENTID;              /* option-code low byte */
-        *resp++ = ri.client_id_len >> 8;        /* option-len high byte */
-        *resp++ = ri.client_id_len;             /* option-len low byte */
-        memcpy(resp, ri.client_id, ri.client_id_len);
-        resp += ri.client_id_len;
-    }
-    if (ri.want_dns) {
-        *resp++ = OPTION_DNS_SERVERS >> 8;      /* option-code high byte */
-        *resp++ = OPTION_DNS_SERVERS;           /* option-code low byte */
-        *resp++ = 0;                            /* option-len high byte */
-        *resp++ = 16;                           /* option-len low byte */
-        memcpy(resp, &slirp->vnameserver_addr6, 16);
-        resp += 16;
-    }
-    if (ri.want_boot_url) {
-        uint8_t *sa = slirp->vhost_addr6.s6_addr;
-        int slen, smaxlen;
-
-        *resp++ = OPTION_BOOTFILE_URL >> 8;     /* option-code high byte */
-        *resp++ = OPTION_BOOTFILE_URL;          /* option-code low byte */
-        smaxlen = (uint8_t *)m->m_data + IF_MTU - (resp + 2);
-        slen = snprintf((char *)resp + 2, smaxlen,
-                        "tftp://[%02x%02x:%02x%02x:%02x%02x:%02x%02x:"
-                                "%02x%02x:%02x%02x:%02x%02x:%02x%02x]/%s",
-                        sa[0], sa[1], sa[2], sa[3], sa[4], sa[5], sa[6], sa[7],
-                        sa[8], sa[9], sa[10], sa[11], sa[12], sa[13], sa[14],
-                        sa[15], slirp->bootp_filename);
-        slen = MIN(slen, smaxlen);
-        *resp++ = slen >> 8;                    /* option-len high byte */
-        *resp++ = slen;                         /* option-len low byte */
-        resp += slen;
-    }
-
-    sa6.sin6_addr = slirp->vhost_addr6;
-    sa6.sin6_port = DHCPV6_SERVER_PORT;
-    da6.sin6_addr = srcsas->sin6_addr;
-    da6.sin6_port = srcsas->sin6_port;
-    m->m_data += sizeof(struct ip6) + sizeof(struct udphdr);
-    m->m_len = resp - (uint8_t *)m->m_data;
-    udp6_output(NULL, m, &sa6, &da6);
-}
-
-/**
- * Handle DHCPv6 messages sent by the client
- */
-void dhcpv6_input(struct sockaddr_in6 *srcsas, struct mbuf *m)
-{
-    uint8_t *data = (uint8_t *)m->m_data + sizeof(struct udphdr);
-    int data_len = m->m_len - sizeof(struct udphdr);
-    uint32_t xid;
-
-    if (data_len < 4) {
-        return;
-    }
-
-    xid = ntohl(*(uint32_t *)data) & 0xffffff;
-
-    switch (data[0]) {
-    case MSGTYPE_INFO_REQUEST:
-        dhcpv6_info_request(m->slirp, srcsas, xid, &data[4], data_len - 4);
-        break;
-    default:
-        DEBUG_MISC("dhcpv6_input: Unsupported message type 0x%x", data[0]);
-    }
-}
diff --git a/slirp/src/dhcpv6.h b/slirp/src/dhcpv6.h
deleted file mode 100644
index dc26a93..0000000
--- a/slirp/src/dhcpv6.h
+++ /dev/null
@@ -1,53 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Definitions and prototypes for SLIRP stateless DHCPv6
- *
- * Copyright 2016 Thomas Huth, Red Hat Inc.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above
- * copyright notice, this list of conditions and the following
- * disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * 3. Neither the name of the copyright holder nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
- * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#ifndef SLIRP_DHCPV6_H
-#define SLIRP_DHCPV6_H
-
-#define DHCPV6_SERVER_PORT 547
-
-#define ALLDHCP_MULTICAST { .s6_addr = \
-                            { 0xff, 0x02, 0x00, 0x00,\
-                            0x00, 0x00, 0x00, 0x00,\
-                            0x00, 0x00, 0x00, 0x00,\
-                            0x00, 0x01, 0x00, 0x02 } }
-
-#define in6_dhcp_multicast(a)\
-    in6_equal(a, &(struct in6_addr)ALLDHCP_MULTICAST)
-
-void dhcpv6_input(struct sockaddr_in6 *srcsas, struct mbuf *m);
-
-#endif
diff --git a/slirp/src/dnssearch.c b/slirp/src/dnssearch.c
deleted file mode 100644
index 12c4889..0000000
--- a/slirp/src/dnssearch.c
+++ /dev/null
@@ -1,311 +0,0 @@
-/* SPDX-License-Identifier: MIT */
-/*
- * Domain search option for DHCP (RFC 3397)
- *
- * Copyright (c) 2012 Klaus Stengel
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-#include "slirp.h"
-
-static const uint8_t RFC3397_OPT_DOMAIN_SEARCH = 119;
-static const uint8_t MAX_OPT_LEN = 255;
-static const uint8_t OPT_HEADER_LEN = 2;
-static const uint8_t REFERENCE_LEN = 2;
-
-struct compact_domain;
-
-typedef struct compact_domain {
-    struct compact_domain *self;
-    struct compact_domain *refdom;
-    uint8_t *labels;
-    size_t len;
-    size_t common_octets;
-} CompactDomain;
-
-static size_t
-domain_suffix_diffoff(const CompactDomain *a, const CompactDomain *b)
-{
-    size_t la = a->len, lb = b->len;
-    uint8_t *da = a->labels + la, *db = b->labels + lb;
-    size_t i, lm = (la < lb) ? la : lb;
-
-    for (i = 0; i < lm; i++) {
-        da--; db--;
-        if (*da != *db) {
-            break;
-        }
-    }
-    return i;
-}
-
-static int domain_suffix_ord(const void *cva, const void *cvb)
-{
-    const CompactDomain *a = cva, *b = cvb;
-    size_t la = a->len, lb = b->len;
-    size_t doff = domain_suffix_diffoff(a, b);
-    uint8_t ca = a->labels[la - doff];
-    uint8_t cb = b->labels[lb - doff];
-
-    if (ca < cb) {
-        return -1;
-    }
-    if (ca > cb) {
-        return 1;
-    }
-    if (la < lb) {
-        return -1;
-    }
-    if (la > lb) {
-        return 1;
-    }
-    return 0;
-}
-
-static size_t domain_common_label(CompactDomain *a, CompactDomain *b)
-{
-    size_t res, doff = domain_suffix_diffoff(a, b);
-    uint8_t *first_eq_pos = a->labels + (a->len - doff);
-    uint8_t *label = a->labels;
-
-    while (*label && label < first_eq_pos) {
-        label += *label + 1;
-    }
-    res = a->len - (label - a->labels);
-    /* only report if it can help to reduce the packet size */
-    return (res > REFERENCE_LEN) ? res : 0;
-}
-
-static void domain_fixup_order(CompactDomain *cd, size_t n)
-{
-    size_t i;
-
-    for (i = 0; i < n; i++) {
-        CompactDomain *cur = cd + i, *next = cd[i].self;
-
-        while (!cur->common_octets) {
-            CompactDomain *tmp = next->self; /* backup target value */
-
-            next->self = cur;
-            cur->common_octets++;
-
-            cur = next;
-            next = tmp;
-        }
-    }
-}
-
-static void domain_mklabels(CompactDomain *cd, const char *input)
-{
-    uint8_t *len_marker = cd->labels;
-    uint8_t *output = len_marker; /* pre-incremented */
-    const char *in = input;
-    char cur_chr;
-    size_t len = 0;
-
-    if (cd->len == 0) {
-        goto fail;
-    }
-    cd->len++;
-
-    do {
-        cur_chr = *in++;
-        if (cur_chr == '.' || cur_chr == '\0') {
-            len = output - len_marker;
-            if ((len == 0 && cur_chr == '.') || len >= 64) {
-                goto fail;
-            }
-            *len_marker = len;
-
-            output++;
-            len_marker = output;
-        } else {
-            output++;
-            *output = cur_chr;
-        }
-    } while (cur_chr != '\0');
-
-    /* ensure proper zero-termination */
-    if (len != 0) {
-        *len_marker = 0;
-        cd->len++;
-    }
-    return;
-
-fail:
-    g_warning("failed to parse domain name '%s'\n", input);
-    cd->len = 0;
-}
-
-static void
-domain_mkxrefs(CompactDomain *doms, CompactDomain *last, size_t depth)
-{
-    CompactDomain *i = doms, *target = doms;
-
-    do {
-        if (i->labels < target->labels) {
-            target = i;
-        }
-    } while (i++ != last);
-
-    for (i = doms; i != last; i++) {
-        CompactDomain *group_last;
-        size_t next_depth;
-
-        if (i->common_octets == depth) {
-            continue;
-        }
-
-        next_depth = -1;
-        for (group_last = i; group_last != last; group_last++) {
-            size_t co = group_last->common_octets;
-            if (co <= depth) {
-                break;
-            }
-            if (co < next_depth) {
-                next_depth = co;
-            }
-        }
-        domain_mkxrefs(i, group_last, next_depth);
-
-        i = group_last;
-        if (i == last) {
-            break;
-        }
-    }
-
-    if (depth == 0) {
-        return;
-    }
-
-    i = doms;
-    do {
-        if (i != target && i->refdom == NULL) {
-            i->refdom = target;
-            i->common_octets = depth;
-        }
-    } while (i++ != last);
-}
-
-static size_t domain_compactify(CompactDomain *domains, size_t n)
-{
-    uint8_t *start = domains->self->labels, *outptr = start;
-    size_t i;
-
-    for (i = 0; i < n; i++) {
-        CompactDomain *cd = domains[i].self;
-        CompactDomain *rd = cd->refdom;
-
-        if (rd != NULL) {
-            size_t moff = (rd->labels - start)
-                    + (rd->len - cd->common_octets);
-            if (moff < 0x3FFFu) {
-                cd->len -= cd->common_octets - 2;
-                cd->labels[cd->len - 1] = moff & 0xFFu;
-                cd->labels[cd->len - 2] = 0xC0u | (moff >> 8);
-            }
-        }
-
-        if (cd->labels != outptr) {
-            memmove(outptr, cd->labels, cd->len);
-            cd->labels = outptr;
-        }
-        outptr += cd->len;
-    }
-    return outptr - start;
-}
-
-int translate_dnssearch(Slirp *s, const char **names)
-{
-    size_t blocks, bsrc_start, bsrc_end, bdst_start;
-    size_t i, num_domains, memreq = 0;
-    uint8_t *result = NULL, *outptr;
-    CompactDomain *domains = NULL;
-    const char **nameptr = names;
-
-    while (*nameptr != NULL) {
-        nameptr++;
-    }
-
-    num_domains = nameptr - names;
-    if (num_domains == 0) {
-        return -2;
-    }
-
-    domains = g_malloc(num_domains * sizeof(*domains));
-
-    for (i = 0; i < num_domains; i++) {
-        size_t nlen = strlen(names[i]);
-        memreq += nlen + 2; /* 1 zero octet + 1 label length octet */
-        domains[i].self = domains + i;
-        domains[i].len = nlen;
-        domains[i].common_octets = 0;
-        domains[i].refdom = NULL;
-    }
-
-    /* reserve extra 2 header bytes for each 255 bytes of output */
-    memreq += DIV_ROUND_UP(memreq, MAX_OPT_LEN) * OPT_HEADER_LEN;
-    result = g_malloc(memreq * sizeof(*result));
-
-    outptr = result;
-    for (i = 0; i < num_domains; i++) {
-        domains[i].labels = outptr;
-        domain_mklabels(domains + i, names[i]);
-        outptr += domains[i].len;
-    }
-
-    if (outptr == result) {
-        g_free(domains);
-        g_free(result);
-        return -1;
-    }
-
-    qsort(domains, num_domains, sizeof(*domains), domain_suffix_ord);
-    domain_fixup_order(domains, num_domains);
-
-    for (i = 1; i < num_domains; i++) {
-        size_t cl = domain_common_label(domains + i - 1, domains + i);
-        domains[i - 1].common_octets = cl;
-    }
-
-    domain_mkxrefs(domains, domains + num_domains - 1, 0);
-    memreq = domain_compactify(domains, num_domains);
-
-    blocks = DIV_ROUND_UP(memreq, MAX_OPT_LEN);
-    bsrc_end = memreq;
-    bsrc_start = (blocks - 1) * MAX_OPT_LEN;
-    bdst_start = bsrc_start + blocks * OPT_HEADER_LEN;
-    memreq += blocks * OPT_HEADER_LEN;
-
-    while (blocks--) {
-        size_t len = bsrc_end - bsrc_start;
-        memmove(result + bdst_start, result + bsrc_start, len);
-        result[bdst_start - 2] = RFC3397_OPT_DOMAIN_SEARCH;
-        result[bdst_start - 1] = len;
-        bsrc_end = bsrc_start;
-        bsrc_start -= MAX_OPT_LEN;
-        bdst_start -= MAX_OPT_LEN + OPT_HEADER_LEN;
-    }
-
-    g_free(domains);
-    s->vdnssearch = result;
-    s->vdnssearch_len = memreq;
-    return 0;
-}
diff --git a/slirp/src/if.c b/slirp/src/if.c
deleted file mode 100644
index 6eaac72..0000000
--- a/slirp/src/if.c
+++ /dev/null
@@ -1,218 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1995 Danny Gasparovski.
- */
-
-#include "slirp.h"
-
-static void
-ifs_insque(struct mbuf *ifm, struct mbuf *ifmhead)
-{
-	ifm->ifs_next = ifmhead->ifs_next;
-	ifmhead->ifs_next = ifm;
-	ifm->ifs_prev = ifmhead;
-	ifm->ifs_next->ifs_prev = ifm;
-}
-
-static void
-ifs_remque(struct mbuf *ifm)
-{
-	ifm->ifs_prev->ifs_next = ifm->ifs_next;
-	ifm->ifs_next->ifs_prev = ifm->ifs_prev;
-}
-
-void
-if_init(Slirp *slirp)
-{
-    slirp->if_fastq.qh_link = slirp->if_fastq.qh_rlink = &slirp->if_fastq;
-    slirp->if_batchq.qh_link = slirp->if_batchq.qh_rlink = &slirp->if_batchq;
-}
-
-/*
- * if_output: Queue packet into an output queue.
- * There are 2 output queue's, if_fastq and if_batchq.
- * Each output queue is a doubly linked list of double linked lists
- * of mbufs, each list belonging to one "session" (socket).  This
- * way, we can output packets fairly by sending one packet from each
- * session, instead of all the packets from one session, then all packets
- * from the next session, etc.  Packets on the if_fastq get absolute
- * priority, but if one session hogs the link, it gets "downgraded"
- * to the batchq until it runs out of packets, then it'll return
- * to the fastq (eg. if the user does an ls -alR in a telnet session,
- * it'll temporarily get downgraded to the batchq)
- */
-void
-if_output(struct socket *so, struct mbuf *ifm)
-{
-	Slirp *slirp = ifm->slirp;
-	struct mbuf *ifq;
-	int on_fastq = 1;
-
-	DEBUG_CALL("if_output");
-	DEBUG_ARG("so = %p", so);
-	DEBUG_ARG("ifm = %p", ifm);
-
-	/*
-	 * First remove the mbuf from m_usedlist,
-	 * since we're gonna use m_next and m_prev ourselves
-	 * XXX Shouldn't need this, gotta change dtom() etc.
-	 */
-	if (ifm->m_flags & M_USEDLIST) {
-		remque(ifm);
-		ifm->m_flags &= ~M_USEDLIST;
-	}
-
-	/*
-	 * See if there's already a batchq list for this session.
-	 * This can include an interactive session, which should go on fastq,
-	 * but gets too greedy... hence it'll be downgraded from fastq to batchq.
-	 * We mustn't put this packet back on the fastq (or we'll send it out of order)
-	 * XXX add cache here?
-	 */
-	if (so) {
-		for (ifq = (struct mbuf *) slirp->if_batchq.qh_rlink;
-		     (struct quehead *) ifq != &slirp->if_batchq;
-		     ifq = ifq->ifq_prev) {
-			if (so == ifq->ifq_so) {
-				/* A match! */
-				ifm->ifq_so = so;
-				ifs_insque(ifm, ifq->ifs_prev);
-				goto diddit;
-			}
-		}
-	}
-
-	/* No match, check which queue to put it on */
-	if (so && (so->so_iptos & IPTOS_LOWDELAY)) {
-		ifq = (struct mbuf *) slirp->if_fastq.qh_rlink;
-		on_fastq = 1;
-		/*
-		 * Check if this packet is a part of the last
-		 * packet's session
-		 */
-		if (ifq->ifq_so == so) {
-			ifm->ifq_so = so;
-			ifs_insque(ifm, ifq->ifs_prev);
-			goto diddit;
-		}
-        } else {
-		ifq = (struct mbuf *) slirp->if_batchq.qh_rlink;
-        }
-
-	/* Create a new doubly linked list for this session */
-	ifm->ifq_so = so;
-	ifs_init(ifm);
-	insque(ifm, ifq);
-
-diddit:
-	if (so) {
-		/* Update *_queued */
-		so->so_queued++;
-		so->so_nqueued++;
-		/*
-		 * Check if the interactive session should be downgraded to
-		 * the batchq.  A session is downgraded if it has queued 6
-		 * packets without pausing, and at least 3 of those packets
-		 * have been sent over the link
-		 * (XXX These are arbitrary numbers, probably not optimal..)
-		 */
-		if (on_fastq && ((so->so_nqueued >= 6) &&
-				 (so->so_nqueued - so->so_queued) >= 3)) {
-
-			/* Remove from current queue... */
-			remque(ifm->ifs_next);
-
-			/* ...And insert in the new.  That'll teach ya! */
-			insque(ifm->ifs_next, &slirp->if_batchq);
-		}
-	}
-
-	/*
-	 * This prevents us from malloc()ing too many mbufs
-	 */
-	if_start(ifm->slirp);
-}
-
-/*
- * Send one packet from each session.
- * If there are packets on the fastq, they are sent FIFO, before
- * everything else.  Then we choose the first packet from each
- * batchq session (socket) and send it.
- * For example, if there are 3 ftp sessions fighting for bandwidth,
- * one packet will be sent from the first session, then one packet
- * from the second session, then one packet from the third.
- */
-void if_start(Slirp *slirp)
-{
-    uint64_t now = slirp->cb->clock_get_ns(slirp->opaque);
-    bool from_batchq = false;
-    struct mbuf *ifm, *ifm_next, *ifqt;
-
-    DEBUG_CALL("if_start");
-
-    if (slirp->if_start_busy) {
-        return;
-    }
-    slirp->if_start_busy = true;
-
-    struct mbuf *batch_head = NULL;
-    if (slirp->if_batchq.qh_link != &slirp->if_batchq) {
-        batch_head = (struct mbuf *) slirp->if_batchq.qh_link;
-    }
-
-    if (slirp->if_fastq.qh_link != &slirp->if_fastq) {
-        ifm_next = (struct mbuf *) slirp->if_fastq.qh_link;
-    } else if (batch_head) {
-        /* Nothing on fastq, pick up from batchq */
-        ifm_next = batch_head;
-        from_batchq = true;
-    } else {
-        ifm_next = NULL;
-    }
-
-    while (ifm_next) {
-        ifm = ifm_next;
-
-        ifm_next = ifm->ifq_next;
-        if ((struct quehead *) ifm_next == &slirp->if_fastq) {
-            /* No more packets in fastq, switch to batchq */
-            ifm_next = batch_head;
-            from_batchq = true;
-        }
-        if ((struct quehead *) ifm_next == &slirp->if_batchq) {
-            /* end of batchq */
-            ifm_next = NULL;
-        }
-
-        /* Try to send packet unless it already expired */
-        if (ifm->expiration_date >= now && !if_encap(slirp, ifm)) {
-            /* Packet is delayed due to pending ARP or NDP resolution */
-            continue;
-        }
-
-        /* Remove it from the queue */
-        ifqt = ifm->ifq_prev;
-        remque(ifm);
-
-        /* If there are more packets for this session, re-queue them */
-        if (ifm->ifs_next != ifm) {
-            struct mbuf *next = ifm->ifs_next;
-
-            insque(next, ifqt);
-            ifs_remque(ifm);
-            if (!from_batchq) {
-                ifm_next = next;
-            }
-        }
-
-        /* Update so_queued */
-        if (ifm->ifq_so && --ifm->ifq_so->so_queued == 0) {
-            /* If there's no more queued, reset nqueued */
-            ifm->ifq_so->so_nqueued = 0;
-        }
-
-        m_free(ifm);
-    }
-
-    slirp->if_start_busy = false;
-}
diff --git a/slirp/src/if.h b/slirp/src/if.h
deleted file mode 100644
index b71c37d..0000000
--- a/slirp/src/if.h
+++ /dev/null
@@ -1,21 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1995 Danny Gasparovski.
- */
-
-#ifndef IF_H
-#define IF_H
-
-#define IF_COMPRESS	0x01	/* We want compression */
-#define IF_NOCOMPRESS	0x02	/* Do not do compression */
-#define IF_AUTOCOMP	0x04	/* Autodetect (default) */
-#define IF_NOCIDCOMP	0x08	/* CID compression */
-
-#define IF_MTU 1500
-#define IF_MRU 1500
-#define	IF_COMP IF_AUTOCOMP	/* Flags for compression */
-
-/* 2 for alignment, 14 for ethernet */
-#define IF_MAXLINKHDR (2 + ETH_HLEN)
-
-#endif
diff --git a/slirp/src/ip.h b/slirp/src/ip.h
deleted file mode 100644
index 1484de1..0000000
--- a/slirp/src/ip.h
+++ /dev/null
@@ -1,242 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1982, 1986, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)ip.h	8.1 (Berkeley) 6/10/93
- * ip.h,v 1.3 1994/08/21 05:27:30 paul Exp
- */
-
-#ifndef IP_H
-#define IP_H
-
-#include <glib.h>
-
-#if G_BYTE_ORDER == G_BIG_ENDIAN
-# undef NTOHL
-# undef NTOHS
-# undef HTONL
-# undef HTONS
-# define NTOHL(d)
-# define NTOHS(d)
-# define HTONL(d)
-# define HTONS(d)
-#else
-# ifndef NTOHL
-#  define NTOHL(d) ((d) = ntohl((d)))
-# endif
-# ifndef NTOHS
-#  define NTOHS(d) ((d) = ntohs((uint16_t)(d)))
-# endif
-# ifndef HTONL
-#  define HTONL(d) ((d) = htonl((d)))
-# endif
-# ifndef HTONS
-#  define HTONS(d) ((d) = htons((uint16_t)(d)))
-# endif
-#endif
-
-typedef uint32_t n_long;                 /* long as received from the net */
-
-/*
- * Definitions for internet protocol version 4.
- * Per RFC 791, September 1981.
- */
-#define	IPVERSION	4
-
-/*
- * Structure of an internet header, naked of options.
- */
-struct ip {
-#if G_BYTE_ORDER == G_BIG_ENDIAN
-	uint8_t ip_v:4,			/* version */
-		ip_hl:4;		/* header length */
-#else
-	uint8_t ip_hl:4,		/* header length */
-		ip_v:4;			/* version */
-#endif
-	uint8_t		ip_tos;			/* type of service */
-	uint16_t	ip_len;			/* total length */
-	uint16_t	ip_id;			/* identification */
-	uint16_t	ip_off;			/* fragment offset field */
-#define	IP_DF 0x4000			/* don't fragment flag */
-#define	IP_MF 0x2000			/* more fragments flag */
-#define	IP_OFFMASK 0x1fff		/* mask for fragmenting bits */
-	uint8_t ip_ttl;			/* time to live */
-	uint8_t ip_p;			/* protocol */
-	uint16_t	ip_sum;			/* checksum */
-	struct	in_addr ip_src,ip_dst;	/* source and dest address */
-} SLIRP_PACKED;
-
-#define	IP_MAXPACKET	65535		/* maximum packet size */
-
-/*
- * Definitions for IP type of service (ip_tos)
- */
-#define	IPTOS_LOWDELAY		0x10
-#define	IPTOS_THROUGHPUT	0x08
-#define	IPTOS_RELIABILITY	0x04
-
-/*
- * Definitions for options.
- */
-#define	IPOPT_COPIED(o)		((o)&0x80)
-#define	IPOPT_CLASS(o)		((o)&0x60)
-#define	IPOPT_NUMBER(o)		((o)&0x1f)
-
-#define	IPOPT_CONTROL		0x00
-#define	IPOPT_RESERVED1		0x20
-#define	IPOPT_DEBMEAS		0x40
-#define	IPOPT_RESERVED2		0x60
-
-#define	IPOPT_EOL		0		/* end of option list */
-#define	IPOPT_NOP		1		/* no operation */
-
-#define	IPOPT_RR		7		/* record packet route */
-#define	IPOPT_TS		68		/* timestamp */
-#define	IPOPT_SECURITY		130		/* provide s,c,h,tcc */
-#define	IPOPT_LSRR		131		/* loose source route */
-#define	IPOPT_SATID		136		/* satnet id */
-#define	IPOPT_SSRR		137		/* strict source route */
-
-/*
- * Offsets to fields in options other than EOL and NOP.
- */
-#define	IPOPT_OPTVAL		0		/* option ID */
-#define	IPOPT_OLEN		1		/* option length */
-#define IPOPT_OFFSET		2		/* offset within option */
-#define	IPOPT_MINOFF		4		/* min value of above */
-
-/*
- * Time stamp option structure.
- */
-struct	ip_timestamp {
-	uint8_t	ipt_code;		/* IPOPT_TS */
-	uint8_t	ipt_len;		/* size of structure (variable) */
-	uint8_t	ipt_ptr;		/* index of current entry */
-#if G_BYTE_ORDER == G_BIG_ENDIAN
-	uint8_t	ipt_oflw:4,		/* overflow counter */
-		ipt_flg:4;		/* flags, see below */
-#else
-	uint8_t	ipt_flg:4,		/* flags, see below */
-		ipt_oflw:4;		/* overflow counter */
-#endif
-	union ipt_timestamp {
-		n_long	ipt_time[1];
-		struct	ipt_ta {
-			struct in_addr ipt_addr;
-			n_long ipt_time;
-		} ipt_ta[1];
-	} ipt_timestamp;
-} SLIRP_PACKED;
-
-/* flag bits for ipt_flg */
-#define	IPOPT_TS_TSONLY		0		/* timestamps only */
-#define	IPOPT_TS_TSANDADDR	1		/* timestamps and addresses */
-#define	IPOPT_TS_PRESPEC	3		/* specified modules only */
-
-/* bits for security (not byte swapped) */
-#define	IPOPT_SECUR_UNCLASS	0x0000
-#define	IPOPT_SECUR_CONFID	0xf135
-#define	IPOPT_SECUR_EFTO	0x789a
-#define	IPOPT_SECUR_MMMM	0xbc4d
-#define	IPOPT_SECUR_RESTR	0xaf13
-#define	IPOPT_SECUR_SECRET	0xd788
-#define	IPOPT_SECUR_TOPSECRET	0x6bc5
-
-/*
- * Internet implementation parameters.
- */
-#define	MAXTTL		255		/* maximum time to live (seconds) */
-#define	IPDEFTTL	64		/* default ttl, from RFC 1340 */
-#define	IPFRAGTTL	60		/* time to live for frags, slowhz */
-#define	IPTTLDEC	1		/* subtracted when forwarding */
-
-#define	IP_MSS		576		/* default maximum segment size */
-
-#if GLIB_SIZEOF_VOID_P == 4
-struct mbuf_ptr {
-	struct mbuf *mptr;
-	uint32_t dummy;
-} SLIRP_PACKED;
-#else
-struct mbuf_ptr {
-	struct mbuf *mptr;
-} SLIRP_PACKED;
-#endif
-struct qlink {
-	void *next, *prev;
-};
-
-/*
- * Overlay for ip header used by other protocols (tcp, udp).
- */
-struct ipovly {
-	struct mbuf_ptr ih_mbuf;	/* backpointer to mbuf */
-	uint8_t	ih_x1;			/* (unused) */
-	uint8_t	ih_pr;			/* protocol */
-	uint16_t	ih_len;			/* protocol length */
-	struct	in_addr ih_src;		/* source internet address */
-	struct	in_addr ih_dst;		/* destination internet address */
-} SLIRP_PACKED;
-
-/*
- * Ip reassembly queue structure.  Each fragment
- * being reassembled is attached to one of these structures.
- * They are timed out after ipq_ttl drops to 0, and may also
- * be reclaimed if memory becomes tight.
- * size 28 bytes
- */
-struct ipq {
-        struct qlink frag_link;			/* to ip headers of fragments */
-	struct qlink ip_link;				/* to other reass headers */
-	uint8_t	ipq_ttl;		/* time for reass q to live */
-	uint8_t	ipq_p;			/* protocol of this fragment */
-	uint16_t	ipq_id;			/* sequence id for reassembly */
-	struct	in_addr ipq_src,ipq_dst;
-};
-
-/*
- * Ip header, when holding a fragment.
- *
- * Note: ipf_link must be at same offset as frag_link above
- */
-struct	ipasfrag {
-	struct qlink ipf_link;
-	struct ip ipf_ip;
-};
-
-G_STATIC_ASSERT(offsetof(struct ipq, frag_link) ==
-                offsetof(struct ipasfrag, ipf_link));
-
-#define ipf_off      ipf_ip.ip_off
-#define ipf_tos      ipf_ip.ip_tos
-#define ipf_len      ipf_ip.ip_len
-#define ipf_next     ipf_link.next
-#define ipf_prev     ipf_link.prev
-
-#endif
diff --git a/slirp/src/ip6.h b/slirp/src/ip6.h
deleted file mode 100644
index 33683c8..0000000
--- a/slirp/src/ip6.h
+++ /dev/null
@@ -1,160 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 2013
- * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
- */
-
-#ifndef SLIRP_IP6_H
-#define SLIRP_IP6_H
-
-#include <glib.h>
-#include <string.h>
-
-#define ALLNODES_MULTICAST  { .s6_addr = \
-                            { 0xff, 0x02, 0x00, 0x00,\
-                            0x00, 0x00, 0x00, 0x00,\
-                            0x00, 0x00, 0x00, 0x00,\
-                            0x00, 0x00, 0x00, 0x01 } }
-
-#define SOLICITED_NODE_PREFIX { .s6_addr = \
-                            { 0xff, 0x02, 0x00, 0x00,\
-                            0x00, 0x00, 0x00, 0x00,\
-                            0x00, 0x00, 0x00, 0x01,\
-                            0xff, 0x00, 0x00, 0x00 } }
-
-#define LINKLOCAL_ADDR  { .s6_addr = \
-                        { 0xfe, 0x80, 0x00, 0x00,\
-                        0x00, 0x00, 0x00, 0x00,\
-                        0x00, 0x00, 0x00, 0x00,\
-                        0x00, 0x00, 0x00, 0x02 } }
-
-#define ZERO_ADDR  { .s6_addr = \
-                        { 0x00, 0x00, 0x00, 0x00,\
-                        0x00, 0x00, 0x00, 0x00,\
-                        0x00, 0x00, 0x00, 0x00,\
-                        0x00, 0x00, 0x00, 0x00 } }
-
-static inline bool in6_equal(const struct in6_addr *a, const struct in6_addr *b)
-{
-    return memcmp(a, b, sizeof(*a)) == 0;
-}
-
-static inline bool in6_equal_net(const struct in6_addr *a,
-                                 const struct in6_addr *b,
-                                 int prefix_len)
-{
-    if (memcmp(a, b, prefix_len / 8) != 0) {
-        return 0;
-    }
-
-    if (prefix_len % 8 == 0) {
-        return 1;
-    }
-
-    return a->s6_addr[prefix_len / 8] >> (8 - (prefix_len % 8))
-        == b->s6_addr[prefix_len / 8] >> (8 - (prefix_len % 8));
-}
-
-static inline bool in6_equal_mach(const struct in6_addr *a,
-                                  const struct in6_addr *b,
-                                  int prefix_len)
-{
-    if (memcmp(&(a->s6_addr[DIV_ROUND_UP(prefix_len, 8)]),
-               &(b->s6_addr[DIV_ROUND_UP(prefix_len, 8)]),
-               16 - DIV_ROUND_UP(prefix_len, 8)) != 0) {
-        return 0;
-    }
-
-    if (prefix_len % 8 == 0) {
-        return 1;
-    }
-
-    return (a->s6_addr[prefix_len / 8] & ((1U << (8 - (prefix_len % 8))) - 1))
-        == (b->s6_addr[prefix_len / 8] & ((1U << (8 - (prefix_len % 8))) - 1));
-}
-
-
-#define in6_equal_router(a)\
-    ((in6_equal_net(a, &slirp->vprefix_addr6, slirp->vprefix_len)\
-      && in6_equal_mach(a, &slirp->vhost_addr6, slirp->vprefix_len))\
-  || (in6_equal_net(a, &(struct in6_addr)LINKLOCAL_ADDR, 64)\
-      && in6_equal_mach(a, &slirp->vhost_addr6, 64)))
-
-#define in6_equal_dns(a)\
-    ((in6_equal_net(a, &slirp->vprefix_addr6, slirp->vprefix_len)\
-      && in6_equal_mach(a, &slirp->vnameserver_addr6, slirp->vprefix_len))\
-  || (in6_equal_net(a, &(struct in6_addr)LINKLOCAL_ADDR, 64)\
-      && in6_equal_mach(a, &slirp->vnameserver_addr6, 64)))
-
-#define in6_equal_host(a)\
-    (in6_equal_router(a) || in6_equal_dns(a))
-
-#define in6_solicitednode_multicast(a)\
-    (in6_equal_net(a, &(struct in6_addr)SOLICITED_NODE_PREFIX, 104))
-
-#define in6_zero(a)\
-    (in6_equal(a, &(struct in6_addr)ZERO_ADDR))
-
-/* Compute emulated host MAC address from its ipv6 address */
-static inline void in6_compute_ethaddr(struct in6_addr ip,
-                                       uint8_t eth[ETH_ALEN])
-{
-    eth[0] = 0x52;
-    eth[1] = 0x56;
-    memcpy(&eth[2], &ip.s6_addr[16 - (ETH_ALEN - 2)], ETH_ALEN - 2);
-}
-
-/*
- * Definitions for internet protocol version 6.
- * Per RFC 2460, December 1998.
- */
-#define IP6VERSION      6
-#define IP6_HOP_LIMIT 255
-
-/*
- * Structure of an internet header, naked of options.
- */
-struct ip6 {
-#if G_BYTE_ORDER == G_BIG_ENDIAN
-    uint32_t
-        ip_v:4,         /* version */
-        ip_tc_hi:4,     /* traffic class */
-        ip_tc_lo:4,
-        ip_fl_hi:4,     /* flow label */
-        ip_fl_lo:16;
-#else
-    uint32_t
-        ip_tc_hi:4,
-        ip_v:4,
-        ip_fl_hi:4,
-        ip_tc_lo:4,
-        ip_fl_lo:16;
-#endif
-    uint16_t    ip_pl;               /* payload length */
-    uint8_t     ip_nh;               /* next header */
-    uint8_t     ip_hl;               /* hop limit */
-    struct in6_addr ip_src, ip_dst;  /* source and dest address */
-};
-
-/*
- * IPv6 pseudo-header used by upper-layer protocols
- */
-struct ip6_pseudohdr {
-    struct      in6_addr ih_src;  /* source internet address */
-    struct      in6_addr ih_dst;  /* destination internet address */
-    uint32_t    ih_pl;            /* upper-layer packet length */
-    uint16_t    ih_zero_hi;       /* zero */
-    uint8_t     ih_zero_lo;       /* zero */
-    uint8_t     ih_nh;            /* next header */
-};
-
-/*
- * We don't want to mark these ip6 structs as packed as they are naturally
- * correctly aligned; instead assert that there is no stray padding.
- * If we marked the struct as packed then we would be unable to take
- * the address of any of the fields in it.
- */
-G_STATIC_ASSERT(sizeof(struct ip6) == 40);
-G_STATIC_ASSERT(sizeof(struct ip6_pseudohdr) == 40);
-
-#endif
diff --git a/slirp/src/ip6_icmp.c b/slirp/src/ip6_icmp.c
deleted file mode 100644
index 5642457..0000000
--- a/slirp/src/ip6_icmp.c
+++ /dev/null
@@ -1,438 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 2013
- * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
- */
-
-#include "slirp.h"
-#include "ip6_icmp.h"
-
-#define NDP_Interval g_rand_int_range(slirp->grand, \
-        NDP_MinRtrAdvInterval, NDP_MaxRtrAdvInterval)
-
-static void ra_timer_handler(void *opaque)
-{
-    Slirp *slirp = opaque;
-
-    slirp->cb->timer_mod(slirp->ra_timer,
-        slirp->cb->clock_get_ns(slirp->opaque) / SCALE_MS + NDP_Interval,
-        slirp->opaque);
-    ndp_send_ra(slirp);
-}
-
-void icmp6_init(Slirp *slirp)
-{
-    if (!slirp->in6_enabled) {
-        return;
-    }
-
-    slirp->ra_timer = slirp->cb->timer_new(ra_timer_handler, slirp, slirp->opaque);
-    slirp->cb->timer_mod(slirp->ra_timer,
-        slirp->cb->clock_get_ns(slirp->opaque) / SCALE_MS + NDP_Interval,
-        slirp->opaque);
-}
-
-void icmp6_cleanup(Slirp *slirp)
-{
-    if (!slirp->in6_enabled) {
-        return;
-    }
-
-    slirp->cb->timer_free(slirp->ra_timer, slirp->opaque);
-}
-
-static void icmp6_send_echoreply(struct mbuf *m, Slirp *slirp, struct ip6 *ip,
-        struct icmp6 *icmp)
-{
-    struct mbuf *t = m_get(slirp);
-    t->m_len = sizeof(struct ip6) + ntohs(ip->ip_pl);
-    memcpy(t->m_data, m->m_data, t->m_len);
-
-    /* IPv6 Packet */
-    struct ip6 *rip = mtod(t, struct ip6 *);
-    rip->ip_dst = ip->ip_src;
-    rip->ip_src = ip->ip_dst;
-
-    /* ICMPv6 packet */
-    t->m_data += sizeof(struct ip6);
-    struct icmp6 *ricmp = mtod(t, struct icmp6 *);
-    ricmp->icmp6_type = ICMP6_ECHO_REPLY;
-    ricmp->icmp6_cksum = 0;
-
-    /* Checksum */
-    t->m_data -= sizeof(struct ip6);
-    ricmp->icmp6_cksum = ip6_cksum(t);
-
-    ip6_output(NULL, t, 0);
-}
-
-void icmp6_send_error(struct mbuf *m, uint8_t type, uint8_t code)
-{
-    Slirp *slirp = m->slirp;
-    struct mbuf *t;
-    struct ip6 *ip = mtod(m, struct ip6 *);
-    char addrstr[INET6_ADDRSTRLEN];
-
-    DEBUG_CALL("icmp6_send_error");
-    DEBUG_ARG("type = %d, code = %d", type, code);
-
-    if (IN6_IS_ADDR_MULTICAST(&ip->ip_src) ||
-            in6_zero(&ip->ip_src)) {
-        /* TODO icmp error? */
-        return;
-    }
-
-    t = m_get(slirp);
-
-    /* IPv6 packet */
-    struct ip6 *rip = mtod(t, struct ip6 *);
-    rip->ip_src = (struct in6_addr)LINKLOCAL_ADDR;
-    rip->ip_dst = ip->ip_src;
-    inet_ntop(AF_INET6, &rip->ip_dst, addrstr, INET6_ADDRSTRLEN);
-    DEBUG_ARG("target = %s", addrstr);
-
-    rip->ip_nh = IPPROTO_ICMPV6;
-    const int error_data_len = MIN(m->m_len,
-            IF_MTU - (sizeof(struct ip6) + ICMP6_ERROR_MINLEN));
-    rip->ip_pl = htons(ICMP6_ERROR_MINLEN + error_data_len);
-    t->m_len = sizeof(struct ip6) + ntohs(rip->ip_pl);
-
-    /* ICMPv6 packet */
-    t->m_data += sizeof(struct ip6);
-    struct icmp6 *ricmp = mtod(t, struct icmp6 *);
-    ricmp->icmp6_type = type;
-    ricmp->icmp6_code = code;
-    ricmp->icmp6_cksum = 0;
-
-    switch (type) {
-    case ICMP6_UNREACH:
-    case ICMP6_TIMXCEED:
-        ricmp->icmp6_err.unused = 0;
-        break;
-    case ICMP6_TOOBIG:
-        ricmp->icmp6_err.mtu = htonl(IF_MTU);
-        break;
-    case ICMP6_PARAMPROB:
-        /* TODO: Handle this case */
-        break;
-    default:
-        g_assert_not_reached();
-        break;
-    }
-    t->m_data += ICMP6_ERROR_MINLEN;
-    memcpy(t->m_data, m->m_data, error_data_len);
-
-    /* Checksum */
-    t->m_data -= ICMP6_ERROR_MINLEN;
-    t->m_data -= sizeof(struct ip6);
-    ricmp->icmp6_cksum = ip6_cksum(t);
-
-    ip6_output(NULL, t, 0);
-}
-
-/*
- * Send NDP Router Advertisement
- */
-void ndp_send_ra(Slirp *slirp)
-{
-    DEBUG_CALL("ndp_send_ra");
-
-    /* Build IPv6 packet */
-    struct mbuf *t = m_get(slirp);
-    struct ip6 *rip = mtod(t, struct ip6 *);
-    size_t pl_size = 0;
-    struct in6_addr addr;
-    uint32_t scope_id;
-
-    rip->ip_src = (struct in6_addr)LINKLOCAL_ADDR;
-    rip->ip_dst = (struct in6_addr)ALLNODES_MULTICAST;
-    rip->ip_nh = IPPROTO_ICMPV6;
-
-    /* Build ICMPv6 packet */
-    t->m_data += sizeof(struct ip6);
-    struct icmp6 *ricmp = mtod(t, struct icmp6 *);
-    ricmp->icmp6_type = ICMP6_NDP_RA;
-    ricmp->icmp6_code = 0;
-    ricmp->icmp6_cksum = 0;
-
-    /* NDP */
-    ricmp->icmp6_nra.chl = NDP_AdvCurHopLimit;
-    ricmp->icmp6_nra.M = NDP_AdvManagedFlag;
-    ricmp->icmp6_nra.O = NDP_AdvOtherConfigFlag;
-    ricmp->icmp6_nra.reserved = 0;
-    ricmp->icmp6_nra.lifetime = htons(NDP_AdvDefaultLifetime);
-    ricmp->icmp6_nra.reach_time = htonl(NDP_AdvReachableTime);
-    ricmp->icmp6_nra.retrans_time = htonl(NDP_AdvRetransTime);
-    t->m_data += ICMP6_NDP_RA_MINLEN;
-    pl_size += ICMP6_NDP_RA_MINLEN;
-
-    /* Source link-layer address (NDP option) */
-    struct ndpopt *opt = mtod(t, struct ndpopt *);
-    opt->ndpopt_type = NDPOPT_LINKLAYER_SOURCE;
-    opt->ndpopt_len = NDPOPT_LINKLAYER_LEN / 8;
-    in6_compute_ethaddr(rip->ip_src, opt->ndpopt_linklayer);
-    t->m_data += NDPOPT_LINKLAYER_LEN;
-    pl_size += NDPOPT_LINKLAYER_LEN;
-
-    /* Prefix information (NDP option) */
-    struct ndpopt *opt2 = mtod(t, struct ndpopt *);
-    opt2->ndpopt_type = NDPOPT_PREFIX_INFO;
-    opt2->ndpopt_len = NDPOPT_PREFIXINFO_LEN / 8;
-    opt2->ndpopt_prefixinfo.prefix_length = slirp->vprefix_len;
-    opt2->ndpopt_prefixinfo.L = 1;
-    opt2->ndpopt_prefixinfo.A = 1;
-    opt2->ndpopt_prefixinfo.reserved1 = 0;
-    opt2->ndpopt_prefixinfo.valid_lt = htonl(NDP_AdvValidLifetime);
-    opt2->ndpopt_prefixinfo.pref_lt = htonl(NDP_AdvPrefLifetime);
-    opt2->ndpopt_prefixinfo.reserved2 = 0;
-    opt2->ndpopt_prefixinfo.prefix = slirp->vprefix_addr6;
-    t->m_data += NDPOPT_PREFIXINFO_LEN;
-    pl_size += NDPOPT_PREFIXINFO_LEN;
-
-    /* Prefix information (NDP option) */
-    if (get_dns6_addr(&addr, &scope_id) >= 0) {
-        /* Host system does have an IPv6 DNS server, announce our proxy.  */
-        struct ndpopt *opt3 = mtod(t, struct ndpopt *);
-        opt3->ndpopt_type = NDPOPT_RDNSS;
-        opt3->ndpopt_len = NDPOPT_RDNSS_LEN / 8;
-        opt3->ndpopt_rdnss.reserved = 0;
-        opt3->ndpopt_rdnss.lifetime = htonl(2 * NDP_MaxRtrAdvInterval);
-        opt3->ndpopt_rdnss.addr = slirp->vnameserver_addr6;
-        t->m_data += NDPOPT_RDNSS_LEN;
-        pl_size += NDPOPT_RDNSS_LEN;
-    }
-
-    rip->ip_pl = htons(pl_size);
-    t->m_data -= sizeof(struct ip6) + pl_size;
-    t->m_len = sizeof(struct ip6) + pl_size;
-
-    /* ICMPv6 Checksum */
-    ricmp->icmp6_cksum = ip6_cksum(t);
-
-    ip6_output(NULL, t, 0);
-}
-
-/*
- * Send NDP Neighbor Solitication
- */
-void ndp_send_ns(Slirp *slirp, struct in6_addr addr)
-{
-    char addrstr[INET6_ADDRSTRLEN];
-
-    inet_ntop(AF_INET6, &addr, addrstr, INET6_ADDRSTRLEN);
-
-    DEBUG_CALL("ndp_send_ns");
-    DEBUG_ARG("target = %s", addrstr);
-
-    /* Build IPv6 packet */
-    struct mbuf *t = m_get(slirp);
-    struct ip6 *rip = mtod(t, struct ip6 *);
-    rip->ip_src = slirp->vhost_addr6;
-    rip->ip_dst = (struct in6_addr)SOLICITED_NODE_PREFIX;
-    memcpy(&rip->ip_dst.s6_addr[13], &addr.s6_addr[13], 3);
-    rip->ip_nh = IPPROTO_ICMPV6;
-    rip->ip_pl = htons(ICMP6_NDP_NS_MINLEN + NDPOPT_LINKLAYER_LEN);
-    t->m_len = sizeof(struct ip6) + ntohs(rip->ip_pl);
-
-    /* Build ICMPv6 packet */
-    t->m_data += sizeof(struct ip6);
-    struct icmp6 *ricmp = mtod(t, struct icmp6 *);
-    ricmp->icmp6_type = ICMP6_NDP_NS;
-    ricmp->icmp6_code = 0;
-    ricmp->icmp6_cksum = 0;
-
-    /* NDP */
-    ricmp->icmp6_nns.reserved = 0;
-    ricmp->icmp6_nns.target = addr;
-
-    /* Build NDP option */
-    t->m_data += ICMP6_NDP_NS_MINLEN;
-    struct ndpopt *opt = mtod(t, struct ndpopt *);
-    opt->ndpopt_type = NDPOPT_LINKLAYER_SOURCE;
-    opt->ndpopt_len = NDPOPT_LINKLAYER_LEN / 8;
-    in6_compute_ethaddr(slirp->vhost_addr6, opt->ndpopt_linklayer);
-
-    /* ICMPv6 Checksum */
-    t->m_data -= ICMP6_NDP_NA_MINLEN;
-    t->m_data -= sizeof(struct ip6);
-    ricmp->icmp6_cksum = ip6_cksum(t);
-
-    ip6_output(NULL, t, 1);
-}
-
-/*
- * Send NDP Neighbor Advertisement
- */
-static void ndp_send_na(Slirp *slirp, struct ip6 *ip, struct icmp6 *icmp)
-{
-    /* Build IPv6 packet */
-    struct mbuf *t = m_get(slirp);
-    struct ip6 *rip = mtod(t, struct ip6 *);
-    rip->ip_src = icmp->icmp6_nns.target;
-    if (in6_zero(&ip->ip_src)) {
-        rip->ip_dst = (struct in6_addr)ALLNODES_MULTICAST;
-    } else {
-        rip->ip_dst = ip->ip_src;
-    }
-    rip->ip_nh = IPPROTO_ICMPV6;
-    rip->ip_pl = htons(ICMP6_NDP_NA_MINLEN
-                        + NDPOPT_LINKLAYER_LEN);
-    t->m_len = sizeof(struct ip6) + ntohs(rip->ip_pl);
-
-    /* Build ICMPv6 packet */
-    t->m_data += sizeof(struct ip6);
-    struct icmp6 *ricmp = mtod(t, struct icmp6 *);
-    ricmp->icmp6_type = ICMP6_NDP_NA;
-    ricmp->icmp6_code = 0;
-    ricmp->icmp6_cksum = 0;
-
-    /* NDP */
-    ricmp->icmp6_nna.R = NDP_IsRouter;
-    ricmp->icmp6_nna.S = !IN6_IS_ADDR_MULTICAST(&rip->ip_dst);
-    ricmp->icmp6_nna.O = 1;
-    ricmp->icmp6_nna.reserved_hi = 0;
-    ricmp->icmp6_nna.reserved_lo = 0;
-    ricmp->icmp6_nna.target = icmp->icmp6_nns.target;
-
-    /* Build NDP option */
-    t->m_data += ICMP6_NDP_NA_MINLEN;
-    struct ndpopt *opt = mtod(t, struct ndpopt *);
-    opt->ndpopt_type = NDPOPT_LINKLAYER_TARGET;
-    opt->ndpopt_len = NDPOPT_LINKLAYER_LEN / 8;
-    in6_compute_ethaddr(ricmp->icmp6_nna.target,
-                    opt->ndpopt_linklayer);
-
-    /* ICMPv6 Checksum */
-    t->m_data -= ICMP6_NDP_NA_MINLEN;
-    t->m_data -= sizeof(struct ip6);
-    ricmp->icmp6_cksum = ip6_cksum(t);
-
-    ip6_output(NULL, t, 0);
-}
-
-/*
- * Process a NDP message
- */
-static void ndp_input(struct mbuf *m, Slirp *slirp, struct ip6 *ip,
-        struct icmp6 *icmp)
-{
-    m->m_len += ETH_HLEN;
-    m->m_data -= ETH_HLEN;
-    struct ethhdr *eth = mtod(m, struct ethhdr *);
-    m->m_len -= ETH_HLEN;
-    m->m_data += ETH_HLEN;
-
-    switch (icmp->icmp6_type) {
-    case ICMP6_NDP_RS:
-        DEBUG_CALL(" type = Router Solicitation");
-        if (ip->ip_hl == 255
-                && icmp->icmp6_code == 0
-                && ntohs(ip->ip_pl) >= ICMP6_NDP_RS_MINLEN) {
-            /* Gratuitous NDP */
-            ndp_table_add(slirp, ip->ip_src, eth->h_source);
-
-            ndp_send_ra(slirp);
-        }
-        break;
-
-    case ICMP6_NDP_RA:
-        DEBUG_CALL(" type = Router Advertisement");
-        slirp->cb->guest_error("Warning: guest sent NDP RA, but shouldn't",
-                               slirp->opaque);
-        break;
-
-    case ICMP6_NDP_NS:
-        DEBUG_CALL(" type = Neighbor Solicitation");
-        if (ip->ip_hl == 255
-                && icmp->icmp6_code == 0
-                && !IN6_IS_ADDR_MULTICAST(&icmp->icmp6_nns.target)
-                && ntohs(ip->ip_pl) >= ICMP6_NDP_NS_MINLEN
-                && (!in6_zero(&ip->ip_src)
-                    || in6_solicitednode_multicast(&ip->ip_dst))) {
-            if (in6_equal_host(&icmp->icmp6_nns.target)) {
-                /* Gratuitous NDP */
-                ndp_table_add(slirp, ip->ip_src, eth->h_source);
-                ndp_send_na(slirp, ip, icmp);
-            }
-        }
-        break;
-
-    case ICMP6_NDP_NA:
-        DEBUG_CALL(" type = Neighbor Advertisement");
-        if (ip->ip_hl == 255
-                && icmp->icmp6_code == 0
-                && ntohs(ip->ip_pl) >= ICMP6_NDP_NA_MINLEN
-                && !IN6_IS_ADDR_MULTICAST(&icmp->icmp6_nna.target)
-                && (!IN6_IS_ADDR_MULTICAST(&ip->ip_dst)
-                    || icmp->icmp6_nna.S == 0)) {
-            ndp_table_add(slirp, ip->ip_src, eth->h_source);
-        }
-        break;
-
-    case ICMP6_NDP_REDIRECT:
-        DEBUG_CALL(" type = Redirect");
-        slirp->cb->guest_error(
-            "Warning: guest sent NDP REDIRECT, but shouldn't", slirp->opaque);
-        break;
-    }
-}
-
-/*
- * Process a received ICMPv6 message.
- */
-void icmp6_input(struct mbuf *m)
-{
-    struct icmp6 *icmp;
-    struct ip6 *ip = mtod(m, struct ip6 *);
-    Slirp *slirp = m->slirp;
-    int hlen = sizeof(struct ip6);
-
-    DEBUG_CALL("icmp6_input");
-    DEBUG_ARG("m = %p", m);
-    DEBUG_ARG("m_len = %d", m->m_len);
-
-    if (ntohs(ip->ip_pl) < ICMP6_MINLEN) {
-        goto end;
-    }
-
-    if (ip6_cksum(m)) {
-        goto end;
-    }
-
-    m->m_len -= hlen;
-    m->m_data += hlen;
-    icmp = mtod(m, struct icmp6 *);
-    m->m_len += hlen;
-    m->m_data -= hlen;
-
-    DEBUG_ARG("icmp6_type = %d", icmp->icmp6_type);
-    switch (icmp->icmp6_type) {
-    case ICMP6_ECHO_REQUEST:
-        if (in6_equal_host(&ip->ip_dst)) {
-            icmp6_send_echoreply(m, slirp, ip, icmp);
-        } else {
-            /* TODO */
-            g_critical("external icmpv6 not supported yet");
-        }
-        break;
-
-    case ICMP6_NDP_RS:
-    case ICMP6_NDP_RA:
-    case ICMP6_NDP_NS:
-    case ICMP6_NDP_NA:
-    case ICMP6_NDP_REDIRECT:
-        ndp_input(m, slirp, ip, icmp);
-        break;
-
-    case ICMP6_UNREACH:
-    case ICMP6_TOOBIG:
-    case ICMP6_TIMXCEED:
-    case ICMP6_PARAMPROB:
-        /* XXX? report error? close socket? */
-    default:
-        break;
-    }
-
-end:
-    m_free(m);
-}
diff --git a/slirp/src/ip6_icmp.h b/slirp/src/ip6_icmp.h
deleted file mode 100644
index d8d13e3..0000000
--- a/slirp/src/ip6_icmp.h
+++ /dev/null
@@ -1,232 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 2013
- * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
- */
-
-#ifndef SLIRP_IP6_ICMP_H
-#define SLIRP_IP6_ICMP_H
-
-/*
- * Interface Control Message Protocol version 6 Definitions.
- * Per RFC 4443, March 2006.
- *
- * Network Discover Protocol Definitions.
- * Per RFC 4861, September 2007.
- */
-
-struct icmp6_echo { /* Echo Messages */
-    uint16_t id;
-    uint16_t seq_num;
-};
-
-union icmp6_error_body {
-    uint32_t unused;
-    uint32_t pointer;
-    uint32_t mtu;
-};
-
-/*
- * NDP Messages
- */
-struct ndp_rs {     /* Router Solicitation Message */
-    uint32_t reserved;
-};
-
-struct ndp_ra {     /* Router Advertisement Message */
-    uint8_t chl;    /* Cur Hop Limit */
-#if G_BYTE_ORDER == G_BIG_ENDIAN
-    uint8_t
-        M:1,
-        O:1,
-        reserved:6;
-#else
-    uint8_t
-        reserved:6,
-        O:1,
-        M:1;
-#endif
-    uint16_t lifetime;      /* Router Lifetime */
-    uint32_t reach_time;    /* Reachable Time */
-    uint32_t retrans_time;  /* Retrans Timer */
-};
-
-G_STATIC_ASSERT(sizeof(struct ndp_ra) == 12);
-
-struct ndp_ns {     /* Neighbor Solicitation Message */
-    uint32_t reserved;
-    struct in6_addr target; /* Target Address */
-};
-
-G_STATIC_ASSERT(sizeof(struct ndp_ns) == 20);
-
-struct ndp_na {     /* Neighbor Advertisement Message */
-#if G_BYTE_ORDER == G_BIG_ENDIAN
-    uint32_t
-        R:1,                /* Router Flag */
-        S:1,                /* Solicited Flag */
-        O:1,                /* Override Flag */
-        reserved_hi:5,
-        reserved_lo:24;
-#else
-    uint32_t
-        reserved_hi:5,
-        O:1,
-        S:1,
-        R:1,
-        reserved_lo:24;
-#endif
-    struct in6_addr target; /* Target Address */
-};
-
-G_STATIC_ASSERT(sizeof(struct ndp_na) == 20);
-
-struct ndp_redirect {
-    uint32_t reserved;
-    struct in6_addr target; /* Target Address */
-    struct in6_addr dest;   /* Destination Address */
-};
-
-G_STATIC_ASSERT(sizeof(struct ndp_redirect) == 36);
-
-/*
- * Structure of an icmpv6 header.
- */
-struct icmp6 {
-    uint8_t     icmp6_type;         /* type of message, see below */
-    uint8_t     icmp6_code;         /* type sub code */
-    uint16_t    icmp6_cksum;        /* ones complement cksum of struct */
-    union {
-        union icmp6_error_body error_body;
-        struct icmp6_echo echo;
-        struct ndp_rs ndp_rs;
-        struct ndp_ra ndp_ra;
-        struct ndp_ns ndp_ns;
-        struct ndp_na ndp_na;
-        struct ndp_redirect ndp_redirect;
-    } icmp6_body;
-#define icmp6_err icmp6_body.error_body
-#define icmp6_echo icmp6_body.echo
-#define icmp6_nrs icmp6_body.ndp_rs
-#define icmp6_nra icmp6_body.ndp_ra
-#define icmp6_nns icmp6_body.ndp_ns
-#define icmp6_nna icmp6_body.ndp_na
-#define icmp6_redirect icmp6_body.ndp_redirect
-};
-
-G_STATIC_ASSERT(sizeof(struct icmp6) == 40);
-
-#define ICMP6_MINLEN    4
-#define ICMP6_ERROR_MINLEN  8
-#define ICMP6_ECHO_MINLEN   8
-#define ICMP6_NDP_RS_MINLEN 8
-#define ICMP6_NDP_RA_MINLEN 16
-#define ICMP6_NDP_NS_MINLEN 24
-#define ICMP6_NDP_NA_MINLEN 24
-#define ICMP6_NDP_REDIRECT_MINLEN 40
-
-/*
- * NDP Options
- */
-struct ndpopt {
-    uint8_t     ndpopt_type;                    /* Option type */
-    uint8_t     ndpopt_len;                     /* /!\ In units of 8 octets */
-    union {
-        unsigned char   linklayer_addr[6];      /* Source/Target Link-layer */
-#define ndpopt_linklayer ndpopt_body.linklayer_addr
-        struct prefixinfo {                     /* Prefix Information */
-            uint8_t     prefix_length;
-#if G_BYTE_ORDER == G_BIG_ENDIAN
-            uint8_t     L:1, A:1, reserved1:6;
-#else
-            uint8_t     reserved1:6, A:1, L:1;
-#endif
-            uint32_t    valid_lt;               /* Valid Lifetime */
-            uint32_t    pref_lt;                /* Preferred Lifetime */
-            uint32_t    reserved2;
-            struct in6_addr prefix;
-        } SLIRP_PACKED prefixinfo;
-#define ndpopt_prefixinfo ndpopt_body.prefixinfo
-        struct rdnss {
-            uint16_t reserved;
-            uint32_t lifetime;
-            struct in6_addr addr;
-        } SLIRP_PACKED rdnss;
-#define ndpopt_rdnss ndpopt_body.rdnss
-    } ndpopt_body;
-} SLIRP_PACKED;
-
-/* NDP options type */
-#define NDPOPT_LINKLAYER_SOURCE     1   /* Source Link-Layer Address */
-#define NDPOPT_LINKLAYER_TARGET     2   /* Target Link-Layer Address */
-#define NDPOPT_PREFIX_INFO          3   /* Prefix Information */
-#define NDPOPT_RDNSS                25  /* Recursive DNS Server Address */
-
-/* NDP options size, in octets. */
-#define NDPOPT_LINKLAYER_LEN    8
-#define NDPOPT_PREFIXINFO_LEN   32
-#define NDPOPT_RDNSS_LEN        24
-
-/*
- * Definition of type and code field values.
- * Per https://www.iana.org/assignments/icmpv6-parameters/icmpv6-parameters.xml
- * Last Updated 2012-11-12
- */
-
-/* Errors */
-#define ICMP6_UNREACH   1   /* Destination Unreachable */
-#define     ICMP6_UNREACH_NO_ROUTE      0   /* no route to dest */
-#define     ICMP6_UNREACH_DEST_PROHIB   1   /* com with dest prohibited */
-#define     ICMP6_UNREACH_SCOPE         2   /* beyond scope of src addr */
-#define     ICMP6_UNREACH_ADDRESS       3   /* address unreachable */
-#define     ICMP6_UNREACH_PORT          4   /* port unreachable */
-#define     ICMP6_UNREACH_SRC_FAIL      5   /* src addr failed */
-#define     ICMP6_UNREACH_REJECT_ROUTE  6   /* reject route to dest */
-#define     ICMP6_UNREACH_SRC_HDR_ERROR 7   /* error in src routing header */
-#define ICMP6_TOOBIG    2   /* Packet Too Big */
-#define ICMP6_TIMXCEED  3   /* Time Exceeded */
-#define     ICMP6_TIMXCEED_INTRANS      0   /* hop limit exceeded in transit */
-#define     ICMP6_TIMXCEED_REASS        1   /* ttl=0 in reass */
-#define ICMP6_PARAMPROB 4   /* Parameter Problem */
-#define     ICMP6_PARAMPROB_HDR_FIELD   0   /* err header field */
-#define     ICMP6_PARAMPROB_NXTHDR_TYPE 1   /* unrecognized Next Header type */
-#define     ICMP6_PARAMPROB_IPV6_OPT    2   /* unrecognized IPv6 option */
-
-/* Informational Messages */
-#define ICMP6_ECHO_REQUEST      128 /* Echo Request */
-#define ICMP6_ECHO_REPLY        129 /* Echo Reply */
-#define ICMP6_NDP_RS            133 /* Router Solicitation (NDP) */
-#define ICMP6_NDP_RA            134 /* Router Advertisement (NDP) */
-#define ICMP6_NDP_NS            135 /* Neighbor Solicitation (NDP) */
-#define ICMP6_NDP_NA            136 /* Neighbor Advertisement (NDP) */
-#define ICMP6_NDP_REDIRECT      137 /* Redirect Message (NDP) */
-
-/*
- * Router Configuration Variables (rfc4861#section-6)
- */
-#define NDP_IsRouter                1
-#define NDP_AdvSendAdvertisements   1
-#define NDP_MaxRtrAdvInterval       600000
-#define NDP_MinRtrAdvInterval       ((NDP_MaxRtrAdvInterval >= 9) ? \
-                                        NDP_MaxRtrAdvInterval / 3 : \
-                                        NDP_MaxRtrAdvInterval)
-#define NDP_AdvManagedFlag          0
-#define NDP_AdvOtherConfigFlag      0
-#define NDP_AdvLinkMTU              0
-#define NDP_AdvReachableTime        0
-#define NDP_AdvRetransTime          0
-#define NDP_AdvCurHopLimit          64
-#define NDP_AdvDefaultLifetime      ((3 * NDP_MaxRtrAdvInterval) / 1000)
-#define NDP_AdvValidLifetime        86400
-#define NDP_AdvOnLinkFlag           1
-#define NDP_AdvPrefLifetime         14400
-#define NDP_AdvAutonomousFlag       1
-
-void icmp6_init(Slirp *slirp);
-void icmp6_cleanup(Slirp *slirp);
-void icmp6_input(struct mbuf *);
-void icmp6_send_error(struct mbuf *m, uint8_t type, uint8_t code);
-void ndp_send_ra(Slirp *slirp);
-void ndp_send_ns(Slirp *slirp, struct in6_addr addr);
-
-#endif
diff --git a/slirp/src/ip6_input.c b/slirp/src/ip6_input.c
deleted file mode 100644
index d9d2b7e..0000000
--- a/slirp/src/ip6_input.c
+++ /dev/null
@@ -1,78 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 2013
- * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
- */
-
-#include "slirp.h"
-#include "ip6_icmp.h"
-
-/*
- * IP initialization: fill in IP protocol switch table.
- * All protocols not implemented in kernel go to raw IP protocol handler.
- */
-void ip6_init(Slirp *slirp)
-{
-    icmp6_init(slirp);
-}
-
-void ip6_cleanup(Slirp *slirp)
-{
-    icmp6_cleanup(slirp);
-}
-
-void ip6_input(struct mbuf *m)
-{
-    struct ip6 *ip6;
-    Slirp *slirp = m->slirp;
-
-    if (!slirp->in6_enabled) {
-        goto bad;
-    }
-
-    DEBUG_CALL("ip6_input");
-    DEBUG_ARG("m = %p", m);
-    DEBUG_ARG("m_len = %d", m->m_len);
-
-    if (m->m_len < sizeof(struct ip6)) {
-        goto bad;
-    }
-
-    ip6 = mtod(m, struct ip6 *);
-
-    if (ip6->ip_v != IP6VERSION) {
-        goto bad;
-    }
-
-    if (ntohs(ip6->ip_pl) > IF_MTU) {
-        icmp6_send_error(m, ICMP6_TOOBIG, 0);
-        goto bad;
-    }
-
-    /* check ip_ttl for a correct ICMP reply */
-    if (ip6->ip_hl == 0) {
-        icmp6_send_error(m, ICMP6_TIMXCEED, ICMP6_TIMXCEED_INTRANS);
-        goto bad;
-    }
-
-    /*
-     * Switch out to protocol's input routine.
-     */
-    switch (ip6->ip_nh) {
-    case IPPROTO_TCP:
-        NTOHS(ip6->ip_pl);
-        tcp_input(m, sizeof(struct ip6), (struct socket *)NULL, AF_INET6);
-        break;
-    case IPPROTO_UDP:
-        udp6_input(m);
-        break;
-    case IPPROTO_ICMPV6:
-        icmp6_input(m);
-        break;
-    default:
-        m_free(m);
-    }
-    return;
-bad:
-    m_free(m);
-}
diff --git a/slirp/src/ip6_output.c b/slirp/src/ip6_output.c
deleted file mode 100644
index b861106..0000000
--- a/slirp/src/ip6_output.c
+++ /dev/null
@@ -1,39 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 2013
- * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
- */
-
-#include "slirp.h"
-
-/* Number of packets queued before we start sending
- * (to prevent allocing too many mbufs) */
-#define IF6_THRESH 10
-
-/*
- * IPv6 output. The packet in mbuf chain m contains a IP header
- */
-int ip6_output(struct socket *so, struct mbuf *m, int fast)
-{
-    struct ip6 *ip = mtod(m, struct ip6 *);
-
-    DEBUG_CALL("ip6_output");
-    DEBUG_ARG("so = %p", so);
-    DEBUG_ARG("m = %p", m);
-
-    /* Fill IPv6 header */
-    ip->ip_v = IP6VERSION;
-    ip->ip_hl = IP6_HOP_LIMIT;
-    ip->ip_tc_hi = 0;
-    ip->ip_tc_lo = 0;
-    ip->ip_fl_hi = 0;
-    ip->ip_fl_lo = 0;
-
-    if (fast) {
-        if_encap(m->slirp, m);
-    } else {
-        if_output(so, m);
-    }
-
-    return 0;
-}
diff --git a/slirp/src/ip_icmp.c b/slirp/src/ip_icmp.c
deleted file mode 100644
index 1aea18a..0000000
--- a/slirp/src/ip_icmp.c
+++ /dev/null
@@ -1,470 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1982, 1986, 1988, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)ip_icmp.c	8.2 (Berkeley) 1/4/94
- * ip_icmp.c,v 1.7 1995/05/30 08:09:42 rgrimes Exp
- */
-
-#include "slirp.h"
-#include "ip_icmp.h"
-
-#ifndef WITH_ICMP_ERROR_MSG
-#define WITH_ICMP_ERROR_MSG 0
-#endif
-
-/* The message sent when emulating PING */
-/* Be nice and tell them it's just a pseudo-ping packet */
-static const char icmp_ping_msg[] = "This is a pseudo-PING packet used by Slirp to emulate ICMP ECHO-REQUEST packets.\n";
-
-/* list of actions for icmp_send_error() on RX of an icmp message */
-static const int icmp_flush[19] = {
-/*  ECHO REPLY (0)  */   0,
-		         1,
-		         1,
-/* DEST UNREACH (3) */   1,
-/* SOURCE QUENCH (4)*/   1,
-/* REDIRECT (5) */       1,
-		         1,
-		         1,
-/* ECHO (8) */           0,
-/* ROUTERADVERT (9) */   1,
-/* ROUTERSOLICIT (10) */ 1,
-/* TIME EXCEEDED (11) */ 1,
-/* PARAMETER PROBLEM (12) */ 1,
-/* TIMESTAMP (13) */     0,
-/* TIMESTAMP REPLY (14) */ 0,
-/* INFO (15) */          0,
-/* INFO REPLY (16) */    0,
-/* ADDR MASK (17) */     0,
-/* ADDR MASK REPLY (18) */ 0
-};
-
-void icmp_init(Slirp *slirp)
-{
-    slirp->icmp.so_next = slirp->icmp.so_prev = &slirp->icmp;
-    slirp->icmp_last_so = &slirp->icmp;
-}
-
-void icmp_cleanup(Slirp *slirp)
-{
-    while (slirp->icmp.so_next != &slirp->icmp) {
-        icmp_detach(slirp->icmp.so_next);
-    }
-}
-
-static int icmp_send(struct socket *so, struct mbuf *m, int hlen)
-{
-    struct ip *ip = mtod(m, struct ip *);
-    struct sockaddr_in addr;
-
-    so->s = slirp_socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP);
-    if (so->s == -1) {
-        return -1;
-    }
-
-    so->so_m = m;
-    so->so_faddr = ip->ip_dst;
-    so->so_laddr = ip->ip_src;
-    so->so_iptos = ip->ip_tos;
-    so->so_type = IPPROTO_ICMP;
-    so->so_state = SS_ISFCONNECTED;
-    so->so_expire = curtime + SO_EXPIRE;
-
-    addr.sin_family = AF_INET;
-    addr.sin_addr = so->so_faddr;
-
-    insque(so, &so->slirp->icmp);
-
-    if (sendto(so->s, m->m_data + hlen, m->m_len - hlen, 0,
-               (struct sockaddr *)&addr, sizeof(addr)) == -1) {
-        DEBUG_MISC("icmp_input icmp sendto tx errno = %d-%s",
-                   errno, strerror(errno));
-        icmp_send_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno));
-        icmp_detach(so);
-    }
-
-    return 0;
-}
-
-void icmp_detach(struct socket *so)
-{
-    so->slirp->cb->unregister_poll_fd(so->s, so->slirp->opaque);
-    closesocket(so->s);
-    sofree(so);
-}
-
-/*
- * Process a received ICMP message.
- */
-void
-icmp_input(struct mbuf *m, int hlen)
-{
-  register struct icmp *icp;
-  register struct ip *ip=mtod(m, struct ip *);
-  int icmplen=ip->ip_len;
-  Slirp *slirp = m->slirp;
-
-  DEBUG_CALL("icmp_input");
-  DEBUG_ARG("m = %p", m);
-  DEBUG_ARG("m_len = %d", m->m_len);
-
-  /*
-   * Locate icmp structure in mbuf, and check
-   * that its not corrupted and of at least minimum length.
-   */
-  if (icmplen < ICMP_MINLEN) {          /* min 8 bytes payload */
-  freeit:
-    m_free(m);
-    goto end_error;
-  }
-
-  m->m_len -= hlen;
-  m->m_data += hlen;
-  icp = mtod(m, struct icmp *);
-  if (cksum(m, icmplen)) {
-    goto freeit;
-  }
-  m->m_len += hlen;
-  m->m_data -= hlen;
-
-  DEBUG_ARG("icmp_type = %d", icp->icmp_type);
-  switch (icp->icmp_type) {
-  case ICMP_ECHO:
-    ip->ip_len += hlen;	             /* since ip_input subtracts this */
-    if (ip->ip_dst.s_addr == slirp->vhost_addr.s_addr ||
-        ip->ip_dst.s_addr == slirp->vnameserver_addr.s_addr) {
-        icmp_reflect(m);
-    } else if (slirp->restricted) {
-        goto freeit;
-    } else {
-      struct socket *so;
-      struct sockaddr_storage addr;
-      so = socreate(slirp);
-      if (icmp_send(so, m, hlen) == 0) {
-        return;
-      }
-      if (udp_attach(so, AF_INET) == -1) {
-	DEBUG_MISC("icmp_input udp_attach errno = %d-%s",
-               errno,strerror(errno));
-	sofree(so);
-	m_free(m);
-	goto end_error;
-      }
-      so->so_m = m;
-      so->so_ffamily = AF_INET;
-      so->so_faddr = ip->ip_dst;
-      so->so_fport = htons(7);
-      so->so_lfamily = AF_INET;
-      so->so_laddr = ip->ip_src;
-      so->so_lport = htons(9);
-      so->so_iptos = ip->ip_tos;
-      so->so_type = IPPROTO_ICMP;
-      so->so_state = SS_ISFCONNECTED;
-
-      /* Send the packet */
-      addr = so->fhost.ss;
-      sotranslate_out(so, &addr);
-
-      if(sendto(so->s, icmp_ping_msg, strlen(icmp_ping_msg), 0,
-		(struct sockaddr *)&addr, sockaddr_size(&addr)) == -1) {
-	DEBUG_MISC("icmp_input udp sendto tx errno = %d-%s",
-               errno,strerror(errno));
-	icmp_send_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno));
-	udp_detach(so);
-      }
-    } /* if ip->ip_dst.s_addr == alias_addr.s_addr */
-    break;
-  case ICMP_UNREACH:
-    /* XXX? report error? close socket? */
-  case ICMP_TIMXCEED:
-  case ICMP_PARAMPROB:
-  case ICMP_SOURCEQUENCH:
-  case ICMP_TSTAMP:
-  case ICMP_MASKREQ:
-  case ICMP_REDIRECT:
-    m_free(m);
-    break;
-
-  default:
-    m_free(m);
-  } /* swith */
-
-end_error:
-  /* m is m_free()'d xor put in a socket xor or given to ip_send */
-  return;
-}
-
-
-/*
- *	Send an ICMP message in response to a situation
- *
- *	RFC 1122: 3.2.2	MUST send at least the IP header and 8 bytes of header. MAY send more (we do).
- *			MUST NOT change this header information.
- *			MUST NOT reply to a multicast/broadcast IP address.
- *			MUST NOT reply to a multicast/broadcast MAC address.
- *			MUST reply to only the first fragment.
- */
-/*
- * Send ICMP_UNREACH back to the source regarding msrc.
- * mbuf *msrc is used as a template, but is NOT m_free()'d.
- * It is reported as the bad ip packet.  The header should
- * be fully correct and in host byte order.
- * ICMP fragmentation is illegal.  All machines must accept 576 bytes in one
- * packet.  The maximum payload is 576-20(ip hdr)-8(icmp hdr)=548
- */
-
-#define ICMP_MAXDATALEN (IP_MSS-28)
-void
-icmp_send_error(struct mbuf *msrc, uint8_t type, uint8_t code, int minsize,
-           const char *message)
-{
-  unsigned hlen, shlen, s_ip_len;
-  register struct ip *ip;
-  register struct icmp *icp;
-  register struct mbuf *m;
-
-  DEBUG_CALL("icmp_send_error");
-  DEBUG_ARG("msrc = %p", msrc);
-  DEBUG_ARG("msrc_len = %d", msrc->m_len);
-
-  if(type!=ICMP_UNREACH && type!=ICMP_TIMXCEED) goto end_error;
-
-  /* check msrc */
-  if(!msrc) goto end_error;
-  ip = mtod(msrc, struct ip *);
-  if (slirp_debug & DBG_MISC) {
-    char bufa[20], bufb[20];
-    strcpy(bufa, inet_ntoa(ip->ip_src));
-    strcpy(bufb, inet_ntoa(ip->ip_dst));
-    DEBUG_MISC(" %.16s to %.16s", bufa, bufb);
-  }
-  if(ip->ip_off & IP_OFFMASK) goto end_error;    /* Only reply to fragment 0 */
-
-  /* Do not reply to source-only IPs */
-  if ((ip->ip_src.s_addr & htonl(~(0xf << 28))) == 0) {
-      goto end_error;
-  }
-
-  shlen=ip->ip_hl << 2;
-  s_ip_len=ip->ip_len;
-  if(ip->ip_p == IPPROTO_ICMP) {
-    icp = (struct icmp *)((char *)ip + shlen);
-    /*
-     *	Assume any unknown ICMP type is an error. This isn't
-     *	specified by the RFC, but think about it..
-     */
-    if(icp->icmp_type>18 || icmp_flush[icp->icmp_type]) goto end_error;
-  }
-
-  /* make a copy */
-  m = m_get(msrc->slirp);
-  if (!m) {
-      goto end_error;
-  }
-
-  { int new_m_size;
-    new_m_size=sizeof(struct ip )+ICMP_MINLEN+msrc->m_len+ICMP_MAXDATALEN;
-    if(new_m_size>m->m_size) m_inc(m, new_m_size);
-  }
-  memcpy(m->m_data, msrc->m_data, msrc->m_len);
-  m->m_len = msrc->m_len;                        /* copy msrc to m */
-
-  /* make the header of the reply packet */
-  ip  = mtod(m, struct ip *);
-  hlen= sizeof(struct ip );     /* no options in reply */
-
-  /* fill in icmp */
-  m->m_data += hlen;
-  m->m_len -= hlen;
-
-  icp = mtod(m, struct icmp *);
-
-  if(minsize) s_ip_len=shlen+ICMP_MINLEN;   /* return header+8b only */
-  else if(s_ip_len>ICMP_MAXDATALEN)         /* maximum size */
-    s_ip_len=ICMP_MAXDATALEN;
-
-  m->m_len=ICMP_MINLEN+s_ip_len;        /* 8 bytes ICMP header */
-
-  /* min. size = 8+sizeof(struct ip)+8 */
-
-  icp->icmp_type = type;
-  icp->icmp_code = code;
-  icp->icmp_id = 0;
-  icp->icmp_seq = 0;
-
-  memcpy(&icp->icmp_ip, msrc->m_data, s_ip_len);   /* report the ip packet */
-  HTONS(icp->icmp_ip.ip_len);
-  HTONS(icp->icmp_ip.ip_id);
-  HTONS(icp->icmp_ip.ip_off);
-
-  if (message && WITH_ICMP_ERROR_MSG) { /* append message to ICMP packet */
-    int message_len;
-    char *cpnt;
-    message_len=strlen(message);
-    if(message_len>ICMP_MAXDATALEN) message_len=ICMP_MAXDATALEN;
-    cpnt=(char *)m->m_data+m->m_len;
-    memcpy(cpnt, message, message_len);
-    m->m_len+=message_len;
-  }
-
-  icp->icmp_cksum = 0;
-  icp->icmp_cksum = cksum(m, m->m_len);
-
-  m->m_data -= hlen;
-  m->m_len += hlen;
-
-  /* fill in ip */
-  ip->ip_hl = hlen >> 2;
-  ip->ip_len = m->m_len;
-
-  ip->ip_tos=((ip->ip_tos & 0x1E) | 0xC0);  /* high priority for errors */
-
-  ip->ip_ttl = MAXTTL;
-  ip->ip_p = IPPROTO_ICMP;
-  ip->ip_dst = ip->ip_src;    /* ip addresses */
-  ip->ip_src = m->slirp->vhost_addr;
-
-  (void ) ip_output((struct socket *)NULL, m);
-
-end_error:
-  return;
-}
-#undef ICMP_MAXDATALEN
-
-/*
- * Reflect the ip packet back to the source
- */
-void
-icmp_reflect(struct mbuf *m)
-{
-  register struct ip *ip = mtod(m, struct ip *);
-  int hlen = ip->ip_hl << 2;
-  int optlen = hlen - sizeof(struct ip );
-  register struct icmp *icp;
-
-  /*
-   * Send an icmp packet back to the ip level,
-   * after supplying a checksum.
-   */
-  m->m_data += hlen;
-  m->m_len -= hlen;
-  icp = mtod(m, struct icmp *);
-
-  icp->icmp_type = ICMP_ECHOREPLY;
-  icp->icmp_cksum = 0;
-  icp->icmp_cksum = cksum(m, ip->ip_len - hlen);
-
-  m->m_data -= hlen;
-  m->m_len += hlen;
-
-  /* fill in ip */
-  if (optlen > 0) {
-    /*
-     * Strip out original options by copying rest of first
-     * mbuf's data back, and adjust the IP length.
-     */
-    memmove((char *)(ip + 1), (char *)ip + hlen,
-	    (unsigned )(m->m_len - hlen));
-    hlen -= optlen;
-    ip->ip_hl = hlen >> 2;
-    ip->ip_len -= optlen;
-    m->m_len -= optlen;
-  }
-
-  ip->ip_ttl = MAXTTL;
-  { /* swap */
-    struct in_addr icmp_dst;
-    icmp_dst = ip->ip_dst;
-    ip->ip_dst = ip->ip_src;
-    ip->ip_src = icmp_dst;
-  }
-
-  (void ) ip_output((struct socket *)NULL, m);
-}
-
-void icmp_receive(struct socket *so)
-{
-    struct mbuf *m = so->so_m;
-    struct ip *ip = mtod(m, struct ip *);
-    int hlen = ip->ip_hl << 2;
-    uint8_t error_code;
-    struct icmp *icp;
-    int id, len;
-
-    m->m_data += hlen;
-    m->m_len -= hlen;
-    icp = mtod(m, struct icmp *);
-
-    id = icp->icmp_id;
-    len = recv(so->s, icp, M_ROOM(m), 0);
-    /*
-     * The behavior of reading SOCK_DGRAM+IPPROTO_ICMP sockets is inconsistent
-     * between host OSes.  On Linux, only the ICMP header and payload is
-     * included.  On macOS/Darwin, the socket acts like a raw socket and
-     * includes the IP header as well.  On other BSDs, SOCK_DGRAM+IPPROTO_ICMP
-     * sockets aren't supported at all, so we treat them like raw sockets.  It
-     * isn't possible to detect this difference at runtime, so we must use an
-     * #ifdef to determine if we need to remove the IP header.
-     */
-#ifdef CONFIG_BSD
-    if (len >= sizeof(struct ip)) {
-        struct ip *inner_ip = mtod(m, struct ip *);
-        int inner_hlen = inner_ip->ip_hl << 2;
-        if (inner_hlen > len) {
-            len = -1;
-            errno = -EINVAL;
-        } else {
-            len -= inner_hlen;
-            memmove(icp, (unsigned char *)icp + inner_hlen, len);
-        }
-    } else {
-      len = -1;
-      errno = -EINVAL;
-    }
-#endif
-    icp->icmp_id = id;
-
-    m->m_data -= hlen;
-    m->m_len += hlen;
-
-    if (len == -1 || len == 0) {
-        if (errno == ENETUNREACH) {
-            error_code = ICMP_UNREACH_NET;
-        } else {
-            error_code = ICMP_UNREACH_HOST;
-        }
-        DEBUG_MISC(" udp icmp rx errno = %d-%s", errno,
-                   strerror(errno));
-        icmp_send_error(so->so_m, ICMP_UNREACH, error_code, 0, strerror(errno));
-    } else {
-        icmp_reflect(so->so_m);
-        so->so_m = NULL; /* Don't m_free() it again! */
-    }
-    icmp_detach(so);
-}
diff --git a/slirp/src/ip_icmp.h b/slirp/src/ip_icmp.h
deleted file mode 100644
index 05d85c5..0000000
--- a/slirp/src/ip_icmp.h
+++ /dev/null
@@ -1,166 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1982, 1986, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)ip_icmp.h	8.1 (Berkeley) 6/10/93
- * ip_icmp.h,v 1.4 1995/05/30 08:09:43 rgrimes Exp
- */
-
-#ifndef NETINET_IP_ICMP_H
-#define NETINET_IP_ICMP_H
-
-/*
- * Interface Control Message Protocol Definitions.
- * Per RFC 792, September 1981.
- */
-
-typedef uint32_t n_time;
-
-/*
- * Structure of an icmp header.
- */
-struct icmp {
-	uint8_t	icmp_type;		/* type of message, see below */
-	uint8_t	icmp_code;		/* type sub code */
-	uint16_t	icmp_cksum;		/* ones complement cksum of struct */
-	union {
-		uint8_t ih_pptr;			/* ICMP_PARAMPROB */
-		struct in_addr ih_gwaddr;	/* ICMP_REDIRECT */
-		struct ih_idseq {
-			uint16_t	icd_id;
-			uint16_t	icd_seq;
-		} ih_idseq;
-		int ih_void;
-
-		/* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
-		struct ih_pmtu {
-			uint16_t ipm_void;
-			uint16_t ipm_nextmtu;
-		} ih_pmtu;
-	} icmp_hun;
-#define	icmp_pptr	icmp_hun.ih_pptr
-#define	icmp_gwaddr	icmp_hun.ih_gwaddr
-#define	icmp_id		icmp_hun.ih_idseq.icd_id
-#define	icmp_seq	icmp_hun.ih_idseq.icd_seq
-#define	icmp_void	icmp_hun.ih_void
-#define	icmp_pmvoid	icmp_hun.ih_pmtu.ipm_void
-#define	icmp_nextmtu	icmp_hun.ih_pmtu.ipm_nextmtu
-	union {
-		struct id_ts {
-			n_time its_otime;
-			n_time its_rtime;
-			n_time its_ttime;
-		} id_ts;
-		struct id_ip  {
-			struct ip idi_ip;
-			/* options and then 64 bits of data */
-		} id_ip;
-		uint32_t	id_mask;
-		char		id_data[1];
-	} icmp_dun;
-#define	icmp_otime	icmp_dun.id_ts.its_otime
-#define	icmp_rtime	icmp_dun.id_ts.its_rtime
-#define	icmp_ttime	icmp_dun.id_ts.its_ttime
-#define	icmp_ip		icmp_dun.id_ip.idi_ip
-#define	icmp_mask	icmp_dun.id_mask
-#define	icmp_data	icmp_dun.id_data
-};
-
-/*
- * Lower bounds on packet lengths for various types.
- * For the error advice packets must first ensure that the
- * packet is large enough to contain the returned ip header.
- * Only then can we do the check to see if 64 bits of packet
- * data have been returned, since we need to check the returned
- * ip header length.
- */
-#define	ICMP_MINLEN	8				/* abs minimum */
-#define	ICMP_TSLEN	(8 + 3 * sizeof (n_time))	/* timestamp */
-#define	ICMP_MASKLEN	12				/* address mask */
-#define	ICMP_ADVLENMIN	(8 + sizeof (struct ip) + 8)	/* min */
-#define	ICMP_ADVLEN(p)	(8 + ((p)->icmp_ip.ip_hl << 2) + 8)
-	/* N.B.: must separately check that ip_hl >= 5 */
-
-/*
- * Definition of type and code field values.
- */
-#define	ICMP_ECHOREPLY		0		/* echo reply */
-#define	ICMP_UNREACH		3		/* dest unreachable, codes: */
-#define		ICMP_UNREACH_NET	0		/* bad net */
-#define		ICMP_UNREACH_HOST	1		/* bad host */
-#define		ICMP_UNREACH_PROTOCOL	2		/* bad protocol */
-#define		ICMP_UNREACH_PORT	3		/* bad port */
-#define		ICMP_UNREACH_NEEDFRAG	4		/* IP_DF caused drop */
-#define		ICMP_UNREACH_SRCFAIL	5		/* src route failed */
-#define		ICMP_UNREACH_NET_UNKNOWN 6		/* unknown net */
-#define		ICMP_UNREACH_HOST_UNKNOWN 7		/* unknown host */
-#define		ICMP_UNREACH_ISOLATED	8		/* src host isolated */
-#define		ICMP_UNREACH_NET_PROHIB	9		/* prohibited access */
-#define		ICMP_UNREACH_HOST_PROHIB 10		/* ditto */
-#define		ICMP_UNREACH_TOSNET	11		/* bad tos for net */
-#define		ICMP_UNREACH_TOSHOST	12		/* bad tos for host */
-#define	ICMP_SOURCEQUENCH	4		/* packet lost, slow down */
-#define	ICMP_REDIRECT		5		/* shorter route, codes: */
-#define		ICMP_REDIRECT_NET	0		/* for network */
-#define		ICMP_REDIRECT_HOST	1		/* for host */
-#define		ICMP_REDIRECT_TOSNET	2		/* for tos and net */
-#define		ICMP_REDIRECT_TOSHOST	3		/* for tos and host */
-#define	ICMP_ECHO		8		/* echo service */
-#define	ICMP_ROUTERADVERT	9		/* router advertisement */
-#define	ICMP_ROUTERSOLICIT	10		/* router solicitation */
-#define	ICMP_TIMXCEED		11		/* time exceeded, code: */
-#define		ICMP_TIMXCEED_INTRANS	0		/* ttl==0 in transit */
-#define		ICMP_TIMXCEED_REASS	1		/* ttl==0 in reass */
-#define	ICMP_PARAMPROB		12		/* ip header bad */
-#define		ICMP_PARAMPROB_OPTABSENT 1		/* req. opt. absent */
-#define	ICMP_TSTAMP		13		/* timestamp request */
-#define	ICMP_TSTAMPREPLY	14		/* timestamp reply */
-#define	ICMP_IREQ		15		/* information request */
-#define	ICMP_IREQREPLY		16		/* information reply */
-#define	ICMP_MASKREQ		17		/* address mask request */
-#define	ICMP_MASKREPLY		18		/* address mask reply */
-
-#define	ICMP_MAXTYPE		18
-
-#define	ICMP_INFOTYPE(type) \
-	((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
-	(type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
-	(type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
-	(type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
-	(type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
-
-void icmp_init(Slirp *slirp);
-void icmp_cleanup(Slirp *slirp);
-void icmp_input(struct mbuf *, int);
-void icmp_send_error(struct mbuf *msrc, uint8_t type, uint8_t code, int minsize,
-                     const char *message);
-void icmp_reflect(struct mbuf *);
-void icmp_receive(struct socket *so);
-void icmp_detach(struct socket *so);
-
-#endif
diff --git a/slirp/src/ip_input.c b/slirp/src/ip_input.c
deleted file mode 100644
index a714fec..0000000
--- a/slirp/src/ip_input.c
+++ /dev/null
@@ -1,469 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1982, 1986, 1988, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)ip_input.c	8.2 (Berkeley) 1/4/94
- * ip_input.c,v 1.11 1994/11/16 10:17:08 jkh Exp
- */
-
-/*
- * Changes and additions relating to SLiRP are
- * Copyright (c) 1995 Danny Gasparovski.
- */
-
-#include "slirp.h"
-#include "ip_icmp.h"
-
-static struct ip *ip_reass(Slirp *slirp, struct ip *ip, struct ipq *fp);
-static void ip_freef(Slirp *slirp, struct ipq *fp);
-static void ip_enq(register struct ipasfrag *p,
-                   register struct ipasfrag *prev);
-static void ip_deq(register struct ipasfrag *p);
-
-/*
- * IP initialization: fill in IP protocol switch table.
- * All protocols not implemented in kernel go to raw IP protocol handler.
- */
-void
-ip_init(Slirp *slirp)
-{
-    slirp->ipq.ip_link.next = slirp->ipq.ip_link.prev = &slirp->ipq.ip_link;
-    udp_init(slirp);
-    tcp_init(slirp);
-    icmp_init(slirp);
-}
-
-void ip_cleanup(Slirp *slirp)
-{
-    udp_cleanup(slirp);
-    tcp_cleanup(slirp);
-    icmp_cleanup(slirp);
-}
-
-/*
- * Ip input routine.  Checksum and byte swap header.  If fragmented
- * try to reassemble.  Process options.  Pass to next level.
- */
-void
-ip_input(struct mbuf *m)
-{
-	Slirp *slirp = m->slirp;
-	register struct ip *ip;
-	int hlen;
-
-	if (!slirp->in_enabled) {
-		goto bad;
-	}
-
-	DEBUG_CALL("ip_input");
-	DEBUG_ARG("m = %p", m);
-	DEBUG_ARG("m_len = %d", m->m_len);
-
-	if (m->m_len < sizeof (struct ip)) {
-		goto bad;
-	}
-
-	ip = mtod(m, struct ip *);
-
-	if (ip->ip_v != IPVERSION) {
-		goto bad;
-	}
-
-	hlen = ip->ip_hl << 2;
-	if (hlen<sizeof(struct ip ) || hlen>m->m_len) {/* min header length */
-	  goto bad;                                  /* or packet too short */
-	}
-
-        /* keep ip header intact for ICMP reply
-	 * ip->ip_sum = cksum(m, hlen);
-	 * if (ip->ip_sum) {
-	 */
-	if(cksum(m,hlen)) {
-	  goto bad;
-	}
-
-	/*
-	 * Convert fields to host representation.
-	 */
-	NTOHS(ip->ip_len);
-	if (ip->ip_len < hlen) {
-		goto bad;
-	}
-	NTOHS(ip->ip_id);
-	NTOHS(ip->ip_off);
-
-	/*
-	 * Check that the amount of data in the buffers
-	 * is as at least much as the IP header would have us expect.
-	 * Trim mbufs if longer than we expect.
-	 * Drop packet if shorter than we expect.
-	 */
-	if (m->m_len < ip->ip_len) {
-		goto bad;
-	}
-
-	/* Should drop packet if mbuf too long? hmmm... */
-	if (m->m_len > ip->ip_len)
-	   m_adj(m, ip->ip_len - m->m_len);
-
-	/* check ip_ttl for a correct ICMP reply */
-	if (ip->ip_ttl == 0) {
-	    icmp_send_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 0, "ttl");
-	    goto bad;
-	}
-
-	/*
-	 * If offset or IP_MF are set, must reassemble.
-	 * Otherwise, nothing need be done.
-	 * (We could look in the reassembly queue to see
-	 * if the packet was previously fragmented,
-	 * but it's not worth the time; just let them time out.)
-	 *
-	 * XXX This should fail, don't fragment yet
-	 */
-	if (ip->ip_off &~ IP_DF) {
-	  register struct ipq *fp;
-      struct qlink *l;
-		/*
-		 * Look for queue of fragments
-		 * of this datagram.
-		 */
-		for (l = slirp->ipq.ip_link.next; l != &slirp->ipq.ip_link;
-		     l = l->next) {
-            fp = container_of(l, struct ipq, ip_link);
-            if (ip->ip_id == fp->ipq_id &&
-                    ip->ip_src.s_addr == fp->ipq_src.s_addr &&
-                    ip->ip_dst.s_addr == fp->ipq_dst.s_addr &&
-                    ip->ip_p == fp->ipq_p)
-		    goto found;
-        }
-        fp = NULL;
-	found:
-
-		/*
-		 * Adjust ip_len to not reflect header,
-		 * set ip_mff if more fragments are expected,
-		 * convert offset of this to bytes.
-		 */
-		ip->ip_len -= hlen;
-		if (ip->ip_off & IP_MF)
-		  ip->ip_tos |= 1;
-		else
-		  ip->ip_tos &= ~1;
-
-		ip->ip_off <<= 3;
-
-		/*
-		 * If datagram marked as having more fragments
-		 * or if this is not the first fragment,
-		 * attempt reassembly; if it succeeds, proceed.
-		 */
-		if (ip->ip_tos & 1 || ip->ip_off) {
-			ip = ip_reass(slirp, ip, fp);
-                        if (ip == NULL)
-				return;
-			m = dtom(slirp, ip);
-		} else
-			if (fp)
-			   ip_freef(slirp, fp);
-
-	} else
-		ip->ip_len -= hlen;
-
-	/*
-	 * Switch out to protocol's input routine.
-	 */
-	switch (ip->ip_p) {
-	 case IPPROTO_TCP:
-		tcp_input(m, hlen, (struct socket *)NULL, AF_INET);
-		break;
-	 case IPPROTO_UDP:
-		udp_input(m, hlen);
-		break;
-	 case IPPROTO_ICMP:
-		icmp_input(m, hlen);
-		break;
-	 default:
-		m_free(m);
-	}
-	return;
-bad:
-	m_free(m);
-}
-
-#define iptofrag(P) ((struct ipasfrag *)(((char*)(P)) - sizeof(struct qlink)))
-#define fragtoip(P) ((struct ip*)(((char*)(P)) + sizeof(struct qlink)))
-/*
- * Take incoming datagram fragment and try to
- * reassemble it into whole datagram.  If a chain for
- * reassembly of this datagram already exists, then it
- * is given as fp; otherwise have to make a chain.
- */
-static struct ip *
-ip_reass(Slirp *slirp, struct ip *ip, struct ipq *fp)
-{
-	register struct mbuf *m = dtom(slirp, ip);
-	register struct ipasfrag *q;
-	int hlen = ip->ip_hl << 2;
-	int i, next;
-
-	DEBUG_CALL("ip_reass");
-	DEBUG_ARG("ip = %p", ip);
-	DEBUG_ARG("fp = %p", fp);
-	DEBUG_ARG("m = %p", m);
-
-	/*
-	 * Presence of header sizes in mbufs
-	 * would confuse code below.
-         * Fragment m_data is concatenated.
-	 */
-	m->m_data += hlen;
-	m->m_len -= hlen;
-
-	/*
-	 * If first fragment to arrive, create a reassembly queue.
-	 */
-        if (fp == NULL) {
-	  struct mbuf *t = m_get(slirp);
-
-	  if (t == NULL) {
-	      goto dropfrag;
-	  }
-	  fp = mtod(t, struct ipq *);
-	  insque(&fp->ip_link, &slirp->ipq.ip_link);
-	  fp->ipq_ttl = IPFRAGTTL;
-	  fp->ipq_p = ip->ip_p;
-	  fp->ipq_id = ip->ip_id;
-	  fp->frag_link.next = fp->frag_link.prev = &fp->frag_link;
-	  fp->ipq_src = ip->ip_src;
-	  fp->ipq_dst = ip->ip_dst;
-	  q = (struct ipasfrag *)fp;
-	  goto insert;
-	}
-
-	/*
-	 * Find a segment which begins after this one does.
-	 */
-	for (q = fp->frag_link.next; q != (struct ipasfrag *)&fp->frag_link;
-            q = q->ipf_next)
-		if (q->ipf_off > ip->ip_off)
-			break;
-
-	/*
-	 * If there is a preceding segment, it may provide some of
-	 * our data already.  If so, drop the data from the incoming
-	 * segment.  If it provides all of our data, drop us.
-	 */
-	if (q->ipf_prev != &fp->frag_link) {
-        struct ipasfrag *pq = q->ipf_prev;
-		i = pq->ipf_off + pq->ipf_len - ip->ip_off;
-		if (i > 0) {
-			if (i >= ip->ip_len)
-				goto dropfrag;
-			m_adj(dtom(slirp, ip), i);
-			ip->ip_off += i;
-			ip->ip_len -= i;
-		}
-	}
-
-	/*
-	 * While we overlap succeeding segments trim them or,
-	 * if they are completely covered, dequeue them.
-	 */
-	while (q != (struct ipasfrag*)&fp->frag_link &&
-            ip->ip_off + ip->ip_len > q->ipf_off) {
-		i = (ip->ip_off + ip->ip_len) - q->ipf_off;
-		if (i < q->ipf_len) {
-			q->ipf_len -= i;
-			q->ipf_off += i;
-			m_adj(dtom(slirp, q), i);
-			break;
-		}
-		q = q->ipf_next;
-		m_free(dtom(slirp, q->ipf_prev));
-		ip_deq(q->ipf_prev);
-	}
-
-insert:
-	/*
-	 * Stick new segment in its place;
-	 * check for complete reassembly.
-	 */
-	ip_enq(iptofrag(ip), q->ipf_prev);
-	next = 0;
-	for (q = fp->frag_link.next; q != (struct ipasfrag*)&fp->frag_link;
-            q = q->ipf_next) {
-		if (q->ipf_off != next)
-                        return NULL;
-		next += q->ipf_len;
-	}
-	if (((struct ipasfrag *)(q->ipf_prev))->ipf_tos & 1)
-                return NULL;
-
-	/*
-	 * Reassembly is complete; concatenate fragments.
-	 */
-    q = fp->frag_link.next;
-	m = dtom(slirp, q);
-
-	q = (struct ipasfrag *) q->ipf_next;
-	while (q != (struct ipasfrag*)&fp->frag_link) {
-	  struct mbuf *t = dtom(slirp, q);
-	  q = (struct ipasfrag *) q->ipf_next;
-	  m_cat(m, t);
-	}
-
-	/*
-	 * Create header for new ip packet by
-	 * modifying header of first packet;
-	 * dequeue and discard fragment reassembly header.
-	 * Make header visible.
-	 */
-	q = fp->frag_link.next;
-
-	/*
-	 * If the fragments concatenated to an mbuf that's
-	 * bigger than the total size of the fragment, then and
-	 * m_ext buffer was alloced. But fp->ipq_next points to
-	 * the old buffer (in the mbuf), so we must point ip
-	 * into the new buffer.
-	 */
-	if (m->m_flags & M_EXT) {
-	  int delta = (char *)q - m->m_dat;
-	  q = (struct ipasfrag *)(m->m_ext + delta);
-	}
-
-    ip = fragtoip(q);
-	ip->ip_len = next;
-	ip->ip_tos &= ~1;
-	ip->ip_src = fp->ipq_src;
-	ip->ip_dst = fp->ipq_dst;
-	remque(&fp->ip_link);
-	(void) m_free(dtom(slirp, fp));
-	m->m_len += (ip->ip_hl << 2);
-	m->m_data -= (ip->ip_hl << 2);
-
-	return ip;
-
-dropfrag:
-	m_free(m);
-        return NULL;
-}
-
-/*
- * Free a fragment reassembly header and all
- * associated datagrams.
- */
-static void
-ip_freef(Slirp *slirp, struct ipq *fp)
-{
-	register struct ipasfrag *q, *p;
-
-	for (q = fp->frag_link.next; q != (struct ipasfrag*)&fp->frag_link; q = p) {
-		p = q->ipf_next;
-		ip_deq(q);
-		m_free(dtom(slirp, q));
-	}
-	remque(&fp->ip_link);
-	(void) m_free(dtom(slirp, fp));
-}
-
-/*
- * Put an ip fragment on a reassembly chain.
- * Like insque, but pointers in middle of structure.
- */
-static void
-ip_enq(register struct ipasfrag *p, register struct ipasfrag *prev)
-{
-	DEBUG_CALL("ip_enq");
-	DEBUG_ARG("prev = %p", prev);
-	p->ipf_prev =  prev;
-	p->ipf_next = prev->ipf_next;
-	((struct ipasfrag *)(prev->ipf_next))->ipf_prev = p;
-	prev->ipf_next = p;
-}
-
-/*
- * To ip_enq as remque is to insque.
- */
-static void
-ip_deq(register struct ipasfrag *p)
-{
-	((struct ipasfrag *)(p->ipf_prev))->ipf_next = p->ipf_next;
-	((struct ipasfrag *)(p->ipf_next))->ipf_prev = p->ipf_prev;
-}
-
-/*
- * IP timer processing;
- * if a timer expires on a reassembly
- * queue, discard it.
- */
-void
-ip_slowtimo(Slirp *slirp)
-{
-    struct qlink *l;
-
-	DEBUG_CALL("ip_slowtimo");
-
-    l = slirp->ipq.ip_link.next;
-
-        if (l == NULL)
-	   return;
-
-    while (l != &slirp->ipq.ip_link) {
-        struct ipq *fp = container_of(l, struct ipq, ip_link);
-        l = l->next;
-		if (--fp->ipq_ttl == 0) {
-			ip_freef(slirp, fp);
-		}
-    }
-}
-
-/*
- * Strip out IP options, at higher
- * level protocol in the kernel.
- * Second argument is buffer to which options
- * will be moved, and return value is their length.
- * (XXX) should be deleted; last arg currently ignored.
- */
-void
-ip_stripoptions(register struct mbuf *m, struct mbuf *mopt)
-{
-	register int i;
-	struct ip *ip = mtod(m, struct ip *);
-	register char *opts;
-	int olen;
-
-	olen = (ip->ip_hl<<2) - sizeof (struct ip);
-	opts = (char *)(ip + 1);
-	i = m->m_len - (sizeof (struct ip) + olen);
-	memcpy(opts, opts  + olen, (unsigned)i);
-	m->m_len -= olen;
-
-	ip->ip_hl = sizeof(struct ip) >> 2;
-}
diff --git a/slirp/src/ip_output.c b/slirp/src/ip_output.c
deleted file mode 100644
index 8560197..0000000
--- a/slirp/src/ip_output.c
+++ /dev/null
@@ -1,170 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1982, 1986, 1988, 1990, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)ip_output.c	8.3 (Berkeley) 1/21/94
- * ip_output.c,v 1.9 1994/11/16 10:17:10 jkh Exp
- */
-
-/*
- * Changes and additions relating to SLiRP are
- * Copyright (c) 1995 Danny Gasparovski.
- */
-
-#include "slirp.h"
-
-/* Number of packets queued before we start sending
- * (to prevent allocing too many mbufs) */
-#define IF_THRESH 10
-
-/*
- * IP output.  The packet in mbuf chain m contains a skeletal IP
- * header (with len, off, ttl, proto, tos, src, dst).
- * The mbuf chain containing the packet will be freed.
- * The mbuf opt, if present, will not be freed.
- */
-int
-ip_output(struct socket *so, struct mbuf *m0)
-{
-	Slirp *slirp = m0->slirp;
-	register struct ip *ip;
-	register struct mbuf *m = m0;
-	register int hlen = sizeof(struct ip );
-	int len, off, error = 0;
-
-	DEBUG_CALL("ip_output");
-	DEBUG_ARG("so = %p", so);
-	DEBUG_ARG("m0 = %p", m0);
-
-	ip = mtod(m, struct ip *);
-	/*
-	 * Fill in IP header.
-	 */
-	ip->ip_v = IPVERSION;
-	ip->ip_off &= IP_DF;
-	ip->ip_id = htons(slirp->ip_id++);
-	ip->ip_hl = hlen >> 2;
-
-	/*
-	 * If small enough for interface, can just send directly.
-	 */
-	if ((uint16_t)ip->ip_len <= IF_MTU) {
-		ip->ip_len = htons((uint16_t)ip->ip_len);
-		ip->ip_off = htons((uint16_t)ip->ip_off);
-		ip->ip_sum = 0;
-		ip->ip_sum = cksum(m, hlen);
-
-		if_output(so, m);
-		goto done;
-	}
-
-	/*
-	 * Too large for interface; fragment if possible.
-	 * Must be able to put at least 8 bytes per fragment.
-	 */
-	if (ip->ip_off & IP_DF) {
-		error = -1;
-		goto bad;
-	}
-
-	len = (IF_MTU - hlen) &~ 7;       /* ip databytes per packet */
-	if (len < 8) {
-		error = -1;
-		goto bad;
-	}
-
-    {
-	int mhlen, firstlen = len;
-	struct mbuf **mnext = &m->m_nextpkt;
-
-	/*
-	 * Loop through length of segment after first fragment,
-	 * make new header and copy data of each part and link onto chain.
-	 */
-	m0 = m;
-	mhlen = sizeof (struct ip);
-	for (off = hlen + len; off < (uint16_t)ip->ip_len; off += len) {
-	  register struct ip *mhip;
-	  m = m_get(slirp);
-          if (m == NULL) {
-	    error = -1;
-	    goto sendorfree;
-	  }
-	  m->m_data += IF_MAXLINKHDR;
-	  mhip = mtod(m, struct ip *);
-	  *mhip = *ip;
-
-	  m->m_len = mhlen;
-	  mhip->ip_off = ((off - hlen) >> 3) + (ip->ip_off & ~IP_MF);
-	  if (ip->ip_off & IP_MF)
-	    mhip->ip_off |= IP_MF;
-	  if (off + len >= (uint16_t)ip->ip_len)
-	    len = (uint16_t)ip->ip_len - off;
-	  else
-	    mhip->ip_off |= IP_MF;
-	  mhip->ip_len = htons((uint16_t)(len + mhlen));
-
-	  if (m_copy(m, m0, off, len) < 0) {
-	    error = -1;
-	    goto sendorfree;
-	  }
-
-	  mhip->ip_off = htons((uint16_t)mhip->ip_off);
-	  mhip->ip_sum = 0;
-	  mhip->ip_sum = cksum(m, mhlen);
-	  *mnext = m;
-	  mnext = &m->m_nextpkt;
-	}
-	/*
-	 * Update first fragment by trimming what's been copied out
-	 * and updating header, then send each fragment (in order).
-	 */
-	m = m0;
-	m_adj(m, hlen + firstlen - (uint16_t)ip->ip_len);
-	ip->ip_len = htons((uint16_t)m->m_len);
-	ip->ip_off = htons((uint16_t)(ip->ip_off | IP_MF));
-	ip->ip_sum = 0;
-	ip->ip_sum = cksum(m, hlen);
-sendorfree:
-	for (m = m0; m; m = m0) {
-		m0 = m->m_nextpkt;
-                m->m_nextpkt = NULL;
-		if (error == 0)
-			if_output(so, m);
-		else
-			m_free(m);
-	}
-    }
-
-done:
-	return (error);
-
-bad:
-	m_free(m0);
-	goto done;
-}
diff --git a/slirp/src/libslirp.h b/slirp/src/libslirp.h
deleted file mode 100644
index 3b28764..0000000
--- a/slirp/src/libslirp.h
+++ /dev/null
@@ -1,118 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-#ifndef LIBSLIRP_H
-#define LIBSLIRP_H
-
-#include <stdint.h>
-#include <stdbool.h>
-#include <sys/types.h>
-
-#ifdef _WIN32
-#include <winsock2.h>
-#include <in6addr.h>
-#else
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#endif
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-typedef struct Slirp Slirp;
-
-enum {
-    SLIRP_POLL_IN  = 1 << 0,
-    SLIRP_POLL_OUT = 1 << 1,
-    SLIRP_POLL_PRI = 1 << 2,
-    SLIRP_POLL_ERR = 1 << 3,
-    SLIRP_POLL_HUP = 1 << 4,
-};
-
-typedef ssize_t (*SlirpReadCb)(void *buf, size_t len, void *opaque);
-typedef ssize_t (*SlirpWriteCb)(const void *buf, size_t len, void *opaque);
-typedef void (*SlirpTimerCb)(void *opaque);
-typedef int (*SlirpAddPollCb)(int fd, int events, void *opaque);
-typedef int (*SlirpGetREventsCb)(int idx, void *opaque);
-
-/*
- * Callbacks from slirp
- */
-typedef struct SlirpCb {
-    /*
-     * Send an ethernet frame to the guest network. The opaque
-     * parameter is the one given to slirp_init(). The function
-     * doesn't need to send all the data and may return <len (no
-     * buffering is done on libslirp side, so the data will be dropped
-     * in this case). <0 reports an IO error.
-     */
-    SlirpWriteCb send_packet;
-    /* Print a message for an error due to guest misbehavior.  */
-    void (*guest_error)(const char *msg, void *opaque);
-    /* Return the virtual clock value in nanoseconds */
-    int64_t (*clock_get_ns)(void *opaque);
-    /* Create a new timer with the given callback and opaque data */
-    void *(*timer_new)(SlirpTimerCb cb, void *cb_opaque, void *opaque);
-    /* Remove and free a timer */
-    void (*timer_free)(void *timer, void *opaque);
-    /* Modify a timer to expire at @expire_time */
-    void (*timer_mod)(void *timer, int64_t expire_time, void *opaque);
-    /* Register a fd for future polling */
-    void (*register_poll_fd)(int fd, void *opaque);
-    /* Unregister a fd */
-    void (*unregister_poll_fd)(int fd, void *opaque);
-    /* Kick the io-thread, to signal that new events may be processed */
-    void (*notify)(void *opaque);
-} SlirpCb;
-
-
-Slirp *slirp_init(int restricted, bool in_enabled, struct in_addr vnetwork,
-                  struct in_addr vnetmask, struct in_addr vhost,
-                  bool in6_enabled,
-                  struct in6_addr vprefix_addr6, uint8_t vprefix_len,
-                  struct in6_addr vhost6, const char *vhostname,
-                  const char *tftp_server_name,
-                  const char *tftp_path, const char *bootfile,
-                  struct in_addr vdhcp_start, struct in_addr vnameserver,
-                  struct in6_addr vnameserver6, const char **vdnssearch,
-                  const char *vdomainname,
-                  const SlirpCb *callbacks,
-                  void *opaque);
-void slirp_cleanup(Slirp *slirp);
-
-void slirp_pollfds_fill(Slirp *slirp, uint32_t *timeout,
-                        SlirpAddPollCb add_poll, void *opaque);
-
-void slirp_pollfds_poll(Slirp *slirp, int select_error,
-                        SlirpGetREventsCb get_revents, void *opaque);
-
-void slirp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len);
-
-int slirp_add_hostfwd(Slirp *slirp, int is_udp,
-                      struct in_addr host_addr, int host_port,
-                      struct in_addr guest_addr, int guest_port);
-int slirp_remove_hostfwd(Slirp *slirp, int is_udp,
-                         struct in_addr host_addr, int host_port);
-int slirp_add_exec(Slirp *slirp, const char *cmdline,
-                   struct in_addr *guest_addr, int guest_port);
-int slirp_add_guestfwd(Slirp *slirp, SlirpWriteCb write_cb, void *opaque,
-                   struct in_addr *guest_addr, int guest_port);
-
-char *slirp_connection_info(Slirp *slirp);
-
-void slirp_socket_recv(Slirp *slirp, struct in_addr guest_addr,
-                       int guest_port, const uint8_t *buf, int size);
-size_t slirp_socket_can_recv(Slirp *slirp, struct in_addr guest_addr,
-                             int guest_port);
-
-void slirp_state_save(Slirp *s, SlirpWriteCb write_cb, void *opaque);
-
-int slirp_state_load(Slirp *s, int version_id,
-                     SlirpReadCb read_cb, void *opaque);
-
-int slirp_state_version(void);
-
-#ifdef __cplusplus
-} /* extern "C" */
-#endif
-
-#endif /* LIBSLIRP_H */
diff --git a/slirp/src/main.h b/slirp/src/main.h
deleted file mode 100644
index 3b3f883..0000000
--- a/slirp/src/main.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1995 Danny Gasparovski.
- */
-
-#ifndef SLIRP_MAIN_H
-#define SLIRP_MAIN_H
-
-extern unsigned curtime;
-extern struct in_addr loopback_addr;
-extern unsigned long loopback_mask;
-
-int if_encap(Slirp *slirp, struct mbuf *ifm);
-ssize_t slirp_send(struct socket *so, const void *buf, size_t len, int flags);
-
-#endif
diff --git a/slirp/src/mbuf.c b/slirp/src/mbuf.c
deleted file mode 100644
index 800406c..0000000
--- a/slirp/src/mbuf.c
+++ /dev/null
@@ -1,235 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1995 Danny Gasparovski
- */
-
-/*
- * mbuf's in SLiRP are much simpler than the real mbufs in
- * FreeBSD.  They are fixed size, determined by the MTU,
- * so that one whole packet can fit.  Mbuf's cannot be
- * chained together.  If there's more data than the mbuf
- * could hold, an external g_malloced buffer is pointed to
- * by m_ext (and the data pointers) and M_EXT is set in
- * the flags
- */
-
-#include "slirp.h"
-
-#define MBUF_THRESH 30
-
-/*
- * Find a nice value for msize
- */
-#define SLIRP_MSIZE\
-    (offsetof(struct mbuf, m_dat) + IF_MAXLINKHDR + TCPIPHDR_DELTA + IF_MTU)
-
-void
-m_init(Slirp *slirp)
-{
-    slirp->m_freelist.qh_link = slirp->m_freelist.qh_rlink = &slirp->m_freelist;
-    slirp->m_usedlist.qh_link = slirp->m_usedlist.qh_rlink = &slirp->m_usedlist;
-}
-
-void m_cleanup(Slirp *slirp)
-{
-    struct mbuf *m, *next;
-
-    m = (struct mbuf *) slirp->m_usedlist.qh_link;
-    while ((struct quehead *) m != &slirp->m_usedlist) {
-        next = m->m_next;
-        if (m->m_flags & M_EXT) {
-            g_free(m->m_ext);
-        }
-        g_free(m);
-        m = next;
-    }
-    m = (struct mbuf *) slirp->m_freelist.qh_link;
-    while ((struct quehead *) m != &slirp->m_freelist) {
-        next = m->m_next;
-        g_free(m);
-        m = next;
-    }
-}
-
-/*
- * Get an mbuf from the free list, if there are none
- * allocate one
- *
- * Because fragmentation can occur if we alloc new mbufs and
- * free old mbufs, we mark all mbufs above mbuf_thresh as M_DOFREE,
- * which tells m_free to actually g_free() it
- */
-struct mbuf *
-m_get(Slirp *slirp)
-{
-	register struct mbuf *m;
-	int flags = 0;
-
-	DEBUG_CALL("m_get");
-
-	if (slirp->m_freelist.qh_link == &slirp->m_freelist) {
-                m = g_malloc(SLIRP_MSIZE);
-		slirp->mbuf_alloced++;
-		if (slirp->mbuf_alloced > MBUF_THRESH)
-			flags = M_DOFREE;
-		m->slirp = slirp;
-	} else {
-		m = (struct mbuf *) slirp->m_freelist.qh_link;
-		remque(m);
-	}
-
-	/* Insert it in the used list */
-	insque(m,&slirp->m_usedlist);
-	m->m_flags = (flags | M_USEDLIST);
-
-	/* Initialise it */
-	m->m_size = SLIRP_MSIZE - offsetof(struct mbuf, m_dat);
-	m->m_data = m->m_dat;
-	m->m_len = 0;
-        m->m_nextpkt = NULL;
-        m->m_prevpkt = NULL;
-        m->resolution_requested = false;
-        m->expiration_date = (uint64_t)-1;
-	DEBUG_ARG("m = %p", m);
-	return m;
-}
-
-void
-m_free(struct mbuf *m)
-{
-
-  DEBUG_CALL("m_free");
-  DEBUG_ARG("m = %p", m);
-
-  if(m) {
-	/* Remove from m_usedlist */
-	if (m->m_flags & M_USEDLIST)
-	   remque(m);
-
-	/* If it's M_EXT, free() it */
-        if (m->m_flags & M_EXT) {
-                g_free(m->m_ext);
-        }
-	/*
-	 * Either free() it or put it on the free list
-	 */
-	if (m->m_flags & M_DOFREE) {
-		m->slirp->mbuf_alloced--;
-                g_free(m);
-	} else if ((m->m_flags & M_FREELIST) == 0) {
-		insque(m,&m->slirp->m_freelist);
-		m->m_flags = M_FREELIST; /* Clobber other flags */
-	}
-  } /* if(m) */
-}
-
-/*
- * Copy data from one mbuf to the end of
- * the other.. if result is too big for one mbuf, allocate
- * an M_EXT data segment
- */
-void
-m_cat(struct mbuf *m, struct mbuf *n)
-{
-	/*
-	 * If there's no room, realloc
-	 */
-	if (M_FREEROOM(m) < n->m_len)
-		m_inc(m, m->m_len + n->m_len);
-
-	memcpy(m->m_data+m->m_len, n->m_data, n->m_len);
-	m->m_len += n->m_len;
-
-	m_free(n);
-}
-
-
-/* make m 'size' bytes large from m_data */
-void
-m_inc(struct mbuf *m, int size)
-{
-    int gapsize;
-
-    /* some compilers throw up on gotos.  This one we can fake. */
-    if (M_ROOM(m) > size) {
-        return;
-    }
-
-    if (m->m_flags & M_EXT) {
-        gapsize = m->m_data - m->m_ext;
-        m->m_ext = g_realloc(m->m_ext, size + gapsize);
-    } else {
-        gapsize = m->m_data - m->m_dat;
-        m->m_ext = g_malloc(size + gapsize);
-        memcpy(m->m_ext, m->m_dat, m->m_size);
-        m->m_flags |= M_EXT;
-    }
-
-    m->m_data = m->m_ext + gapsize;
-    m->m_size = size + gapsize;
-}
-
-
-
-void
-m_adj(struct mbuf *m, int len)
-{
-	if (m == NULL)
-		return;
-	if (len >= 0) {
-		/* Trim from head */
-		m->m_data += len;
-		m->m_len -= len;
-	} else {
-		/* Trim from tail */
-		len = -len;
-		m->m_len -= len;
-	}
-}
-
-
-/*
- * Copy len bytes from m, starting off bytes into n
- */
-int
-m_copy(struct mbuf *n, struct mbuf *m, int off, int len)
-{
-	if (len > M_FREEROOM(n))
-		return -1;
-
-	memcpy((n->m_data + n->m_len), (m->m_data + off), len);
-	n->m_len += len;
-	return 0;
-}
-
-
-/*
- * Given a pointer into an mbuf, return the mbuf
- * XXX This is a kludge, I should eliminate the need for it
- * Fortunately, it's not used often
- */
-struct mbuf *
-dtom(Slirp *slirp, void *dat)
-{
-	struct mbuf *m;
-
-	DEBUG_CALL("dtom");
-	DEBUG_ARG("dat = %p", dat);
-
-	/* bug corrected for M_EXT buffers */
-	for (m = (struct mbuf *) slirp->m_usedlist.qh_link;
-	     (struct quehead *) m != &slirp->m_usedlist;
-	     m = m->m_next) {
-	  if (m->m_flags & M_EXT) {
-	    if( (char *)dat>=m->m_ext && (char *)dat<(m->m_ext + m->m_size) )
-	      return m;
-	  } else {
-	    if( (char *)dat >= m->m_dat && (char *)dat<(m->m_dat + m->m_size) )
-	      return m;
-	  }
-	}
-
-	DEBUG_ERROR("dtom failed");
-
-	return (struct mbuf *)0;
-}
diff --git a/slirp/src/mbuf.h b/slirp/src/mbuf.h
deleted file mode 100644
index 732c85c..0000000
--- a/slirp/src/mbuf.h
+++ /dev/null
@@ -1,127 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1982, 1986, 1988, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)mbuf.h	8.3 (Berkeley) 1/21/94
- * mbuf.h,v 1.9 1994/11/14 13:54:20 bde Exp
- */
-
-#ifndef MBUF_H
-#define MBUF_H
-
-/*
- * Macros for type conversion
- * mtod(m,t) -	convert mbuf pointer to data pointer of correct type
- */
-#define mtod(m,t)	((t)(m)->m_data)
-
-/* XXX About mbufs for slirp:
- * Only one mbuf is ever used in a chain, for each "cell" of data.
- * m_nextpkt points to the next packet, if fragmented.
- * If the data is too large, the M_EXT is used, and a larger block
- * is alloced.  Therefore, m_free[m] must check for M_EXT and if set
- * free the m_ext.  This is inefficient memory-wise, but who cares.
- */
-
-/*
- * mbufs allow to have a gap between the start of the allocated buffer (m_ext if
- * M_EXT is set, m_dat otherwise) and the in-use data:
- *
- *  |--gapsize----->|---m_len------->
- *  |----------m_size------------------------------>
- *                  |----M_ROOM-------------------->
- *                                   |-M_FREEROOM-->
- *
- *  ^               ^                               ^
- *  m_dat/m_ext     m_data                          end of buffer
- */
-
-/*
- * How much room is in the mbuf, from m_data to the end of the mbuf
- */
-#define M_ROOM(m) ((m->m_flags & M_EXT)? \
-			(((m)->m_ext + (m)->m_size) - (m)->m_data) \
-		   : \
-			(((m)->m_dat + (m)->m_size) - (m)->m_data))
-
-/*
- * How much free room there is
- */
-#define M_FREEROOM(m) (M_ROOM(m) - (m)->m_len)
-
-struct mbuf {
-	/* XXX should union some of these! */
-	/* header at beginning of each mbuf: */
-	struct	mbuf *m_next;		/* Linked list of mbufs */
-	struct	mbuf *m_prev;
-	struct	mbuf *m_nextpkt;	/* Next packet in queue/record */
-	struct	mbuf *m_prevpkt;	/* Flags aren't used in the output queue */
-	int	m_flags;		/* Misc flags */
-
-	int	m_size;			/* Size of mbuf, from m_dat or m_ext */
-	struct	socket *m_so;
-
-	char *m_data;			/* Current location of data */
-	int	m_len;			/* Amount of data in this mbuf, from m_data */
-
-	Slirp *slirp;
-	bool	resolution_requested;
-	uint64_t expiration_date;
-	char   *m_ext;
-	/* start of dynamic buffer area, must be last element */
-	char    m_dat[];
-};
-
-#define ifq_prev m_prev
-#define ifq_next m_next
-#define ifs_prev m_prevpkt
-#define ifs_next m_nextpkt
-#define ifq_so m_so
-
-#define M_EXT			0x01	/* m_ext points to more (malloced) data */
-#define M_FREELIST		0x02	/* mbuf is on free list */
-#define M_USEDLIST		0x04	/* XXX mbuf is on used list (for dtom()) */
-#define M_DOFREE		0x08	/* when m_free is called on the mbuf, free()
-					 * it rather than putting it on the free list */
-
-void m_init(Slirp *);
-void m_cleanup(Slirp *slirp);
-struct mbuf * m_get(Slirp *);
-void m_free(struct mbuf *);
-void m_cat(register struct mbuf *, register struct mbuf *);
-void m_inc(struct mbuf *, int);
-void m_adj(struct mbuf *, int);
-int m_copy(struct mbuf *, struct mbuf *, int, int);
-struct mbuf * dtom(Slirp *, void *);
-
-static inline void ifs_init(struct mbuf *ifm)
-{
-    ifm->ifs_next = ifm->ifs_prev = ifm;
-}
-
-#endif
diff --git a/slirp/src/misc.c b/slirp/src/misc.c
deleted file mode 100644
index 7c5db0e..0000000
--- a/slirp/src/misc.c
+++ /dev/null
@@ -1,321 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1995 Danny Gasparovski.
- */
-
-#include "slirp.h"
-
-inline void
-insque(void *a, void *b)
-{
-	register struct quehead *element = (struct quehead *) a;
-	register struct quehead *head = (struct quehead *) b;
-	element->qh_link = head->qh_link;
-	head->qh_link = (struct quehead *)element;
-	element->qh_rlink = (struct quehead *)head;
-	((struct quehead *)(element->qh_link))->qh_rlink
-	= (struct quehead *)element;
-}
-
-inline void
-remque(void *a)
-{
-  register struct quehead *element = (struct quehead *) a;
-  ((struct quehead *)(element->qh_link))->qh_rlink = element->qh_rlink;
-  ((struct quehead *)(element->qh_rlink))->qh_link = element->qh_link;
-  element->qh_rlink = NULL;
-}
-
-/* TODO: IPv6 */
-struct gfwd_list *
-add_guestfwd(struct gfwd_list **ex_ptr,
-             SlirpWriteCb write_cb, void *opaque,
-             struct in_addr addr, int port)
-{
-    struct gfwd_list *f = g_new0(struct gfwd_list, 1);
-
-    f->write_cb = write_cb;
-    f->opaque = opaque;
-    f->ex_fport = port;
-    f->ex_addr = addr;
-    f->ex_next = *ex_ptr;
-    *ex_ptr = f;
-
-    return f;
-}
-
-struct gfwd_list *
-add_exec(struct gfwd_list **ex_ptr, const char *cmdline,
-         struct in_addr addr, int port)
-{
-    struct gfwd_list *f = add_guestfwd(ex_ptr, NULL, NULL, addr, port);
-
-    f->ex_exec = g_strdup(cmdline);
-
-    return f;
-}
-
-static int
-slirp_socketpair_with_oob(int sv[2])
-{
-    struct sockaddr_in addr = {
-        .sin_family = AF_INET,
-        .sin_port = 0,
-        .sin_addr.s_addr = INADDR_ANY,
-    };
-    socklen_t addrlen = sizeof(addr);
-    int ret, s;
-
-    sv[1] = -1;
-    s = slirp_socket(AF_INET, SOCK_STREAM, 0);
-    if (s < 0 || bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
-        listen(s, 1) < 0 ||
-        getsockname(s, (struct sockaddr *)&addr, &addrlen) < 0) {
-        goto err;
-    }
-
-    sv[1] = slirp_socket(AF_INET, SOCK_STREAM, 0);
-    if (sv[1] < 0) {
-        goto err;
-    }
-    /*
-     * This connect won't block because we've already listen()ed on
-     * the server end (even though we won't accept() the connection
-     * until later on).
-     */
-    do {
-        ret = connect(sv[1], (struct sockaddr *)&addr, addrlen);
-    } while (ret < 0 && errno == EINTR);
-    if (ret < 0) {
-        goto err;
-    }
-
-    do {
-        sv[0] = accept(s, (struct sockaddr *)&addr, &addrlen);
-    } while (sv[0] < 0 && errno == EINTR);
-    if (sv[0] < 0) {
-        goto err;
-    }
-
-    closesocket(s);
-    return 0;
-
-err:
-    g_critical("slirp_socketpair(): %s", strerror(errno));
-    if (s >= 0) {
-        closesocket(s);
-    }
-    if (sv[1] >= 0) {
-        closesocket(sv[1]);
-    }
-    return -1;
-}
-
-static void
-fork_exec_child_setup(gpointer data)
-{
-#ifndef _WIN32
-    setsid();
-#endif
-}
-
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
-
-#if !GLIB_CHECK_VERSION(2, 58, 0)
-typedef struct SlirpGSpawnFds {
-    GSpawnChildSetupFunc child_setup;
-    gpointer user_data;
-    gint stdin_fd;
-    gint stdout_fd;
-    gint stderr_fd;
-} SlirpGSpawnFds;
-
-static inline void
-slirp_gspawn_fds_setup(gpointer user_data)
-{
-    SlirpGSpawnFds *q = (SlirpGSpawnFds *)user_data;
-
-    dup2(q->stdin_fd, 0);
-    dup2(q->stdout_fd, 1);
-    dup2(q->stderr_fd, 2);
-    q->child_setup(q->user_data);
-}
-#endif
-
-static inline gboolean
-g_spawn_async_with_fds_slirp(const gchar *working_directory,
-                            gchar **argv,
-                            gchar **envp,
-                            GSpawnFlags flags,
-                            GSpawnChildSetupFunc child_setup,
-                            gpointer user_data,
-                            GPid *child_pid,
-                            gint stdin_fd,
-                            gint stdout_fd,
-                            gint stderr_fd,
-                            GError **error)
-{
-#if GLIB_CHECK_VERSION(2, 58, 0)
-    return g_spawn_async_with_fds(working_directory, argv, envp, flags,
-                                  child_setup, user_data,
-                                  child_pid, stdin_fd, stdout_fd, stderr_fd,
-                                  error);
-#else
-    SlirpGSpawnFds setup = {
-        .child_setup = child_setup,
-        .user_data = user_data,
-        .stdin_fd = stdin_fd,
-        .stdout_fd = stdout_fd,
-        .stderr_fd = stderr_fd,
-    };
-
-    return g_spawn_async(working_directory, argv, envp, flags,
-                         slirp_gspawn_fds_setup, &setup,
-                         child_pid, error);
-#endif
-}
-
-#define g_spawn_async_with_fds(wd, argv, env, f, c, d, p, ifd, ofd, efd, err) \
-    g_spawn_async_with_fds_slirp(wd, argv, env, f, c, d, p, ifd, ofd, efd, err)
-
-#pragma GCC diagnostic pop
-
-int
-fork_exec(struct socket *so, const char *ex)
-{
-    GError *err = NULL;
-    char **argv;
-    int opt, sp[2];
-
-    DEBUG_CALL("fork_exec");
-    DEBUG_ARG("so = %p", so);
-    DEBUG_ARG("ex = %p", ex);
-
-    if (slirp_socketpair_with_oob(sp) < 0) {
-        return 0;
-    }
-
-    argv = g_strsplit(ex, " ", -1);
-    g_spawn_async_with_fds(NULL /* cwd */,
-                           argv,
-                           NULL /* env */,
-                           G_SPAWN_SEARCH_PATH,
-                           fork_exec_child_setup, NULL /* data */,
-                           NULL /* child_pid */,
-                           sp[1], sp[1], sp[1],
-                           &err);
-    g_strfreev(argv);
-
-    if (err) {
-        g_critical("fork_exec: %s", err->message);
-        g_error_free(err);
-        closesocket(sp[0]);
-        closesocket(sp[1]);
-        return 0;
-    }
-
-    so->s = sp[0];
-    closesocket(sp[1]);
-    slirp_socket_set_fast_reuse(so->s);
-    opt = 1;
-    setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int));
-    slirp_set_nonblock(so->s);
-    so->slirp->cb->register_poll_fd(so->s, so->slirp->opaque);
-    return 1;
-}
-
-char *slirp_connection_info(Slirp *slirp)
-{
-    GString *str = g_string_new(NULL);
-    const char * const tcpstates[] = {
-        [TCPS_CLOSED]       = "CLOSED",
-        [TCPS_LISTEN]       = "LISTEN",
-        [TCPS_SYN_SENT]     = "SYN_SENT",
-        [TCPS_SYN_RECEIVED] = "SYN_RCVD",
-        [TCPS_ESTABLISHED]  = "ESTABLISHED",
-        [TCPS_CLOSE_WAIT]   = "CLOSE_WAIT",
-        [TCPS_FIN_WAIT_1]   = "FIN_WAIT_1",
-        [TCPS_CLOSING]      = "CLOSING",
-        [TCPS_LAST_ACK]     = "LAST_ACK",
-        [TCPS_FIN_WAIT_2]   = "FIN_WAIT_2",
-        [TCPS_TIME_WAIT]    = "TIME_WAIT",
-    };
-    struct in_addr dst_addr;
-    struct sockaddr_in src;
-    socklen_t src_len;
-    uint16_t dst_port;
-    struct socket *so;
-    const char *state;
-    char buf[20];
-
-    g_string_append_printf(str,
-        "  Protocol[State]    FD  Source Address  Port   "
-        "Dest. Address  Port RecvQ SendQ\n");
-
-    /* TODO: IPv6 */
-
-    for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
-        if (so->so_state & SS_HOSTFWD) {
-            state = "HOST_FORWARD";
-        } else if (so->so_tcpcb) {
-            state = tcpstates[so->so_tcpcb->t_state];
-        } else {
-            state = "NONE";
-        }
-        if (so->so_state & (SS_HOSTFWD | SS_INCOMING)) {
-            src_len = sizeof(src);
-            getsockname(so->s, (struct sockaddr *)&src, &src_len);
-            dst_addr = so->so_laddr;
-            dst_port = so->so_lport;
-        } else {
-            src.sin_addr = so->so_laddr;
-            src.sin_port = so->so_lport;
-            dst_addr = so->so_faddr;
-            dst_port = so->so_fport;
-        }
-        snprintf(buf, sizeof(buf), "  TCP[%s]", state);
-        g_string_append_printf(str, "%-19s %3d %15s %5d ", buf, so->s,
-                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
-                       ntohs(src.sin_port));
-        g_string_append_printf(str, "%15s %5d %5d %5d\n",
-                       inet_ntoa(dst_addr), ntohs(dst_port),
-                       so->so_rcv.sb_cc, so->so_snd.sb_cc);
-    }
-
-    for (so = slirp->udb.so_next; so != &slirp->udb; so = so->so_next) {
-        if (so->so_state & SS_HOSTFWD) {
-            snprintf(buf, sizeof(buf), "  UDP[HOST_FORWARD]");
-            src_len = sizeof(src);
-            getsockname(so->s, (struct sockaddr *)&src, &src_len);
-            dst_addr = so->so_laddr;
-            dst_port = so->so_lport;
-        } else {
-            snprintf(buf, sizeof(buf), "  UDP[%d sec]",
-                         (so->so_expire - curtime) / 1000);
-            src.sin_addr = so->so_laddr;
-            src.sin_port = so->so_lport;
-            dst_addr = so->so_faddr;
-            dst_port = so->so_fport;
-        }
-        g_string_append_printf(str, "%-19s %3d %15s %5d ", buf, so->s,
-                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
-                       ntohs(src.sin_port));
-        g_string_append_printf(str, "%15s %5d %5d %5d\n",
-                       inet_ntoa(dst_addr), ntohs(dst_port),
-                       so->so_rcv.sb_cc, so->so_snd.sb_cc);
-    }
-
-    for (so = slirp->icmp.so_next; so != &slirp->icmp; so = so->so_next) {
-        snprintf(buf, sizeof(buf), "  ICMP[%d sec]",
-                     (so->so_expire - curtime) / 1000);
-        src.sin_addr = so->so_laddr;
-        dst_addr = so->so_faddr;
-        g_string_append_printf(str, "%-19s %3d %15s  -    ", buf, so->s,
-                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*");
-        g_string_append_printf(str, "%15s  -    %5d %5d\n", inet_ntoa(dst_addr),
-                       so->so_rcv.sb_cc, so->so_snd.sb_cc);
-    }
-
-    return g_string_free(str, FALSE);
-}
diff --git a/slirp/src/misc.h b/slirp/src/misc.h
deleted file mode 100644
index 23b7490..0000000
--- a/slirp/src/misc.h
+++ /dev/null
@@ -1,66 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1995 Danny Gasparovski.
- */
-
-#ifndef MISC_H
-#define MISC_H
-
-#include "libslirp.h"
-
-struct gfwd_list {
-	SlirpWriteCb write_cb;
-	void *opaque;
-	struct in_addr ex_addr;		/* Server address */
-	int ex_fport;                   /* Port to telnet to */
-	char *ex_exec;                  /* Command line of what to exec */
-	struct gfwd_list *ex_next;
-};
-
-#define EMU_NONE 0x0
-
-/* TCP emulations */
-#define EMU_CTL 0x1
-#define EMU_FTP 0x2
-#define EMU_KSH 0x3
-#define EMU_IRC 0x4
-#define EMU_REALAUDIO 0x5
-#define EMU_RLOGIN 0x6
-#define EMU_IDENT 0x7
-
-#define EMU_NOCONNECT 0x10	/* Don't connect */
-
-struct tos_t {
-    uint16_t lport;
-    uint16_t fport;
-    uint8_t tos;
-    uint8_t emu;
-};
-
-struct emu_t {
-    uint16_t lport;
-    uint16_t fport;
-    uint8_t tos;
-    uint8_t emu;
-    struct emu_t *next;
-};
-
-struct slirp_quehead {
-    struct slirp_quehead *qh_link;
-    struct slirp_quehead *qh_rlink;
-};
-
-void slirp_insque(void *, void *);
-void slirp_remque(void *);
-int fork_exec(struct socket *so, const char *ex);
-
-struct gfwd_list *
-add_guestfwd(struct gfwd_list **ex_ptr,
-             SlirpWriteCb write_cb, void *opaque,
-             struct in_addr addr, int port);
-
-struct gfwd_list *
-add_exec(struct gfwd_list **ex_ptr, const char *cmdline,
-         struct in_addr addr, int port);
-
-#endif
diff --git a/slirp/src/ncsi-pkt.h b/slirp/src/ncsi-pkt.h
deleted file mode 100644
index 4c0be39..0000000
--- a/slirp/src/ncsi-pkt.h
+++ /dev/null
@@ -1,445 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright Gavin Shan, IBM Corporation 2016.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above
- * copyright notice, this list of conditions and the following
- * disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * 3. Neither the name of the copyright holder nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
- * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef NCSI_PKT_H
-#define NCSI_PKT_H
-
-/* from linux/net/ncsi/ncsi-pkt.h */
-#define __be32 uint32_t
-#define __be16 uint16_t
-
-struct ncsi_pkt_hdr {
-        unsigned char mc_id;        /* Management controller ID */
-        unsigned char revision;     /* NCSI version - 0x01      */
-        unsigned char reserved;     /* Reserved                 */
-        unsigned char id;           /* Packet sequence number   */
-        unsigned char type;         /* Packet type              */
-        unsigned char channel;      /* Network controller ID    */
-        __be16        length;       /* Payload length           */
-        __be32        reserved1[2]; /* Reserved                 */
-};
-
-struct ncsi_cmd_pkt_hdr {
-        struct ncsi_pkt_hdr common; /* Common NCSI packet header */
-};
-
-struct ncsi_rsp_pkt_hdr {
-        struct ncsi_pkt_hdr common; /* Common NCSI packet header */
-        __be16              code;   /* Response code             */
-        __be16              reason; /* Response reason           */
-};
-
-struct ncsi_aen_pkt_hdr {
-        struct ncsi_pkt_hdr common;       /* Common NCSI packet header */
-        unsigned char       reserved2[3]; /* Reserved                  */
-        unsigned char       type;         /* AEN packet type           */
-};
-
-/* NCSI common command packet */
-struct ncsi_cmd_pkt {
-        struct ncsi_cmd_pkt_hdr cmd;      /* Command header */
-        __be32                  checksum; /* Checksum       */
-        unsigned char           pad[26];
-};
-
-struct ncsi_rsp_pkt {
-        struct ncsi_rsp_pkt_hdr rsp;      /* Response header */
-        __be32                  checksum; /* Checksum        */
-        unsigned char           pad[22];
-};
-
-/* Select Package */
-struct ncsi_cmd_sp_pkt {
-        struct ncsi_cmd_pkt_hdr cmd;            /* Command header */
-        unsigned char           reserved[3];    /* Reserved       */
-        unsigned char           hw_arbitration; /* HW arbitration */
-        __be32                  checksum;       /* Checksum       */
-        unsigned char           pad[22];
-};
-
-/* Disable Channel */
-struct ncsi_cmd_dc_pkt {
-        struct ncsi_cmd_pkt_hdr cmd;         /* Command header  */
-        unsigned char           reserved[3]; /* Reserved        */
-        unsigned char           ald;         /* Allow link down */
-        __be32                  checksum;    /* Checksum        */
-        unsigned char           pad[22];
-};
-
-/* Reset Channel */
-struct ncsi_cmd_rc_pkt {
-        struct ncsi_cmd_pkt_hdr cmd;      /* Command header */
-        __be32                  reserved; /* Reserved       */
-        __be32                  checksum; /* Checksum       */
-        unsigned char           pad[22];
-};
-
-/* AEN Enable */
-struct ncsi_cmd_ae_pkt {
-        struct ncsi_cmd_pkt_hdr cmd;         /* Command header   */
-        unsigned char           reserved[3]; /* Reserved         */
-        unsigned char           mc_id;       /* MC ID            */
-        __be32                  mode;        /* AEN working mode */
-        __be32                  checksum;    /* Checksum         */
-        unsigned char           pad[18];
-};
-
-/* Set Link */
-struct ncsi_cmd_sl_pkt {
-        struct ncsi_cmd_pkt_hdr cmd;      /* Command header    */
-        __be32                  mode;     /* Link working mode */
-        __be32                  oem_mode; /* OEM link mode     */
-        __be32                  checksum; /* Checksum          */
-        unsigned char           pad[18];
-};
-
-/* Set VLAN Filter */
-struct ncsi_cmd_svf_pkt {
-        struct ncsi_cmd_pkt_hdr cmd;       /* Command header    */
-        __be16                  reserved;  /* Reserved          */
-        __be16                  vlan;      /* VLAN ID           */
-        __be16                  reserved1; /* Reserved          */
-        unsigned char           index;     /* VLAN table index  */
-        unsigned char           enable;    /* Enable or disable */
-        __be32                  checksum;  /* Checksum          */
-        unsigned char           pad[14];
-};
-
-/* Enable VLAN */
-struct ncsi_cmd_ev_pkt {
-        struct ncsi_cmd_pkt_hdr cmd;         /* Command header   */
-        unsigned char           reserved[3]; /* Reserved         */
-        unsigned char           mode;        /* VLAN filter mode */
-        __be32                  checksum;    /* Checksum         */
-        unsigned char           pad[22];
-};
-
-/* Set MAC Address */
-struct ncsi_cmd_sma_pkt {
-        struct ncsi_cmd_pkt_hdr cmd;      /* Command header          */
-        unsigned char           mac[6];   /* MAC address             */
-        unsigned char           index;    /* MAC table index         */
-        unsigned char           at_e;     /* Addr type and operation */
-        __be32                  checksum; /* Checksum                */
-        unsigned char           pad[18];
-};
-
-/* Enable Broadcast Filter */
-struct ncsi_cmd_ebf_pkt {
-        struct ncsi_cmd_pkt_hdr cmd;      /* Command header */
-        __be32                  mode;     /* Filter mode    */
-        __be32                  checksum; /* Checksum       */
-        unsigned char           pad[22];
-};
-
-/* Enable Global Multicast Filter */
-struct ncsi_cmd_egmf_pkt {
-        struct ncsi_cmd_pkt_hdr cmd;      /* Command header */
-        __be32                  mode;     /* Global MC mode */
-        __be32                  checksum; /* Checksum       */
-        unsigned char           pad[22];
-};
-
-/* Set NCSI Flow Control */
-struct ncsi_cmd_snfc_pkt {
-        struct ncsi_cmd_pkt_hdr cmd;         /* Command header    */
-        unsigned char           reserved[3]; /* Reserved          */
-        unsigned char           mode;        /* Flow control mode */
-        __be32                  checksum;    /* Checksum          */
-        unsigned char           pad[22];
-};
-
-/* Get Link Status */
-struct ncsi_rsp_gls_pkt {
-        struct ncsi_rsp_pkt_hdr rsp;        /* Response header   */
-        __be32                  status;     /* Link status       */
-        __be32                  other;      /* Other indications */
-        __be32                  oem_status; /* OEM link status   */
-        __be32                  checksum;
-        unsigned char           pad[10];
-};
-
-/* Get Version ID */
-struct ncsi_rsp_gvi_pkt {
-        struct ncsi_rsp_pkt_hdr rsp;          /* Response header */
-        __be32                  ncsi_version; /* NCSI version    */
-        unsigned char           reserved[3];  /* Reserved        */
-        unsigned char           alpha2;       /* NCSI version    */
-        unsigned char           fw_name[12];  /* f/w name string */
-        __be32                  fw_version;   /* f/w version     */
-        __be16                  pci_ids[4];   /* PCI IDs         */
-        __be32                  mf_id;        /* Manufacture ID  */
-        __be32                  checksum;
-};
-
-/* Get Capabilities */
-struct ncsi_rsp_gc_pkt {
-        struct ncsi_rsp_pkt_hdr rsp;         /* Response header   */
-        __be32                  cap;         /* Capabilities      */
-        __be32                  bc_cap;      /* Broadcast cap     */
-        __be32                  mc_cap;      /* Multicast cap     */
-        __be32                  buf_cap;     /* Buffering cap     */
-        __be32                  aen_cap;     /* AEN cap           */
-        unsigned char           vlan_cnt;    /* VLAN filter count */
-        unsigned char           mixed_cnt;   /* Mix filter count  */
-        unsigned char           mc_cnt;      /* MC filter count   */
-        unsigned char           uc_cnt;      /* UC filter count   */
-        unsigned char           reserved[2]; /* Reserved          */
-        unsigned char           vlan_mode;   /* VLAN mode         */
-        unsigned char           channel_cnt; /* Channel count     */
-        __be32                  checksum;    /* Checksum          */
-};
-
-/* Get Parameters */
-struct ncsi_rsp_gp_pkt {
-        struct ncsi_rsp_pkt_hdr rsp;          /* Response header       */
-        unsigned char           mac_cnt;      /* Number of MAC addr    */
-        unsigned char           reserved[2];  /* Reserved              */
-        unsigned char           mac_enable;   /* MAC addr enable flags */
-        unsigned char           vlan_cnt;     /* VLAN tag count        */
-        unsigned char           reserved1;    /* Reserved              */
-        __be16                  vlan_enable;  /* VLAN tag enable flags */
-        __be32                  link_mode;    /* Link setting          */
-        __be32                  bc_mode;      /* BC filter mode        */
-        __be32                  valid_modes;  /* Valid mode parameters */
-        unsigned char           vlan_mode;    /* VLAN mode             */
-        unsigned char           fc_mode;      /* Flow control mode     */
-        unsigned char           reserved2[2]; /* Reserved              */
-        __be32                  aen_mode;     /* AEN mode              */
-        unsigned char           mac[6];       /* Supported MAC addr    */
-        __be16                  vlan;         /* Supported VLAN tags   */
-        __be32                  checksum;     /* Checksum              */
-};
-
-/* Get Controller Packet Statistics */
-struct ncsi_rsp_gcps_pkt {
-        struct ncsi_rsp_pkt_hdr rsp;            /* Response header            */
-        __be32                  cnt_hi;         /* Counter cleared            */
-        __be32                  cnt_lo;         /* Counter cleared            */
-        __be32                  rx_bytes;       /* Rx bytes                   */
-        __be32                  tx_bytes;       /* Tx bytes                   */
-        __be32                  rx_uc_pkts;     /* Rx UC packets              */
-        __be32                  rx_mc_pkts;     /* Rx MC packets              */
-        __be32                  rx_bc_pkts;     /* Rx BC packets              */
-        __be32                  tx_uc_pkts;     /* Tx UC packets              */
-        __be32                  tx_mc_pkts;     /* Tx MC packets              */
-        __be32                  tx_bc_pkts;     /* Tx BC packets              */
-        __be32                  fcs_err;        /* FCS errors                 */
-        __be32                  align_err;      /* Alignment errors           */
-        __be32                  false_carrier;  /* False carrier detection    */
-        __be32                  runt_pkts;      /* Rx runt packets            */
-        __be32                  jabber_pkts;    /* Rx jabber packets          */
-        __be32                  rx_pause_xon;   /* Rx pause XON frames        */
-        __be32                  rx_pause_xoff;  /* Rx XOFF frames             */
-        __be32                  tx_pause_xon;   /* Tx XON frames              */
-        __be32                  tx_pause_xoff;  /* Tx XOFF frames             */
-        __be32                  tx_s_collision; /* Single collision frames    */
-        __be32                  tx_m_collision; /* Multiple collision frames  */
-        __be32                  l_collision;    /* Late collision frames      */
-        __be32                  e_collision;    /* Excessive collision frames */
-        __be32                  rx_ctl_frames;  /* Rx control frames          */
-        __be32                  rx_64_frames;   /* Rx 64-bytes frames         */
-        __be32                  rx_127_frames;  /* Rx 65-127 bytes frames     */
-        __be32                  rx_255_frames;  /* Rx 128-255 bytes frames    */
-        __be32                  rx_511_frames;  /* Rx 256-511 bytes frames    */
-        __be32                  rx_1023_frames; /* Rx 512-1023 bytes frames   */
-        __be32                  rx_1522_frames; /* Rx 1024-1522 bytes frames  */
-        __be32                  rx_9022_frames; /* Rx 1523-9022 bytes frames  */
-        __be32                  tx_64_frames;   /* Tx 64-bytes frames         */
-        __be32                  tx_127_frames;  /* Tx 65-127 bytes frames     */
-        __be32                  tx_255_frames;  /* Tx 128-255 bytes frames    */
-        __be32                  tx_511_frames;  /* Tx 256-511 bytes frames    */
-        __be32                  tx_1023_frames; /* Tx 512-1023 bytes frames   */
-        __be32                  tx_1522_frames; /* Tx 1024-1522 bytes frames  */
-        __be32                  tx_9022_frames; /* Tx 1523-9022 bytes frames  */
-        __be32                  rx_valid_bytes; /* Rx valid bytes             */
-        __be32                  rx_runt_pkts;   /* Rx error runt packets      */
-        __be32                  rx_jabber_pkts; /* Rx error jabber packets    */
-        __be32                  checksum;       /* Checksum                   */
-};
-
-/* Get NCSI Statistics */
-struct ncsi_rsp_gns_pkt {
-        struct ncsi_rsp_pkt_hdr rsp;           /* Response header         */
-        __be32                  rx_cmds;       /* Rx NCSI commands        */
-        __be32                  dropped_cmds;  /* Dropped commands        */
-        __be32                  cmd_type_errs; /* Command type errors     */
-        __be32                  cmd_csum_errs; /* Command checksum errors */
-        __be32                  rx_pkts;       /* Rx NCSI packets         */
-        __be32                  tx_pkts;       /* Tx NCSI packets         */
-        __be32                  tx_aen_pkts;   /* Tx AEN packets          */
-        __be32                  checksum;      /* Checksum                */
-};
-
-/* Get NCSI Pass-through Statistics */
-struct ncsi_rsp_gnpts_pkt {
-        struct ncsi_rsp_pkt_hdr rsp;            /* Response header     */
-        __be32                  tx_pkts;        /* Tx packets          */
-        __be32                  tx_dropped;     /* Tx dropped packets  */
-        __be32                  tx_channel_err; /* Tx channel errors   */
-        __be32                  tx_us_err;      /* Tx undersize errors */
-        __be32                  rx_pkts;        /* Rx packets          */
-        __be32                  rx_dropped;     /* Rx dropped packets  */
-        __be32                  rx_channel_err; /* Rx channel errors   */
-        __be32                  rx_us_err;      /* Rx undersize errors */
-        __be32                  rx_os_err;      /* Rx oversize errors  */
-        __be32                  checksum;       /* Checksum            */
-};
-
-/* Get package status */
-struct ncsi_rsp_gps_pkt {
-        struct ncsi_rsp_pkt_hdr rsp;      /* Response header             */
-        __be32                  status;   /* Hardware arbitration status */
-        __be32                  checksum;
-};
-
-/* Get package UUID */
-struct ncsi_rsp_gpuuid_pkt {
-        struct ncsi_rsp_pkt_hdr rsp;      /* Response header */
-        unsigned char           uuid[16]; /* UUID            */
-        __be32                  checksum;
-};
-
-/* AEN: Link State Change */
-struct ncsi_aen_lsc_pkt {
-        struct ncsi_aen_pkt_hdr aen;        /* AEN header      */
-        __be32                  status;     /* Link status     */
-        __be32                  oem_status; /* OEM link status */
-        __be32                  checksum;   /* Checksum        */
-        unsigned char           pad[14];
-};
-
-/* AEN: Configuration Required */
-struct ncsi_aen_cr_pkt {
-        struct ncsi_aen_pkt_hdr aen;      /* AEN header */
-        __be32                  checksum; /* Checksum   */
-        unsigned char           pad[22];
-};
-
-/* AEN: Host Network Controller Driver Status Change */
-struct ncsi_aen_hncdsc_pkt {
-        struct ncsi_aen_pkt_hdr aen;      /* AEN header */
-        __be32                  status;   /* Status     */
-        __be32                  checksum; /* Checksum   */
-        unsigned char           pad[18];
-};
-
-/* NCSI packet revision */
-#define NCSI_PKT_REVISION       0x01
-
-/* NCSI packet commands */
-#define NCSI_PKT_CMD_CIS        0x00 /* Clear Initial State              */
-#define NCSI_PKT_CMD_SP         0x01 /* Select Package                   */
-#define NCSI_PKT_CMD_DP         0x02 /* Deselect Package                 */
-#define NCSI_PKT_CMD_EC         0x03 /* Enable Channel                   */
-#define NCSI_PKT_CMD_DC         0x04 /* Disable Channel                  */
-#define NCSI_PKT_CMD_RC         0x05 /* Reset Channel                    */
-#define NCSI_PKT_CMD_ECNT       0x06 /* Enable Channel Network Tx        */
-#define NCSI_PKT_CMD_DCNT       0x07 /* Disable Channel Network Tx       */
-#define NCSI_PKT_CMD_AE         0x08 /* AEN Enable                       */
-#define NCSI_PKT_CMD_SL         0x09 /* Set Link                         */
-#define NCSI_PKT_CMD_GLS        0x0a /* Get Link                         */
-#define NCSI_PKT_CMD_SVF        0x0b /* Set VLAN Filter                  */
-#define NCSI_PKT_CMD_EV         0x0c /* Enable VLAN                      */
-#define NCSI_PKT_CMD_DV         0x0d /* Disable VLAN                     */
-#define NCSI_PKT_CMD_SMA        0x0e /* Set MAC address                  */
-#define NCSI_PKT_CMD_EBF        0x10 /* Enable Broadcast Filter          */
-#define NCSI_PKT_CMD_DBF        0x11 /* Disable Broadcast Filter         */
-#define NCSI_PKT_CMD_EGMF       0x12 /* Enable Global Multicast Filter   */
-#define NCSI_PKT_CMD_DGMF       0x13 /* Disable Global Multicast Filter  */
-#define NCSI_PKT_CMD_SNFC       0x14 /* Set NCSI Flow Control            */
-#define NCSI_PKT_CMD_GVI        0x15 /* Get Version ID                   */
-#define NCSI_PKT_CMD_GC         0x16 /* Get Capabilities                 */
-#define NCSI_PKT_CMD_GP         0x17 /* Get Parameters                   */
-#define NCSI_PKT_CMD_GCPS       0x18 /* Get Controller Packet Statistics */
-#define NCSI_PKT_CMD_GNS        0x19 /* Get NCSI Statistics              */
-#define NCSI_PKT_CMD_GNPTS      0x1a /* Get NCSI Pass-throu Statistics   */
-#define NCSI_PKT_CMD_GPS        0x1b /* Get package status               */
-#define NCSI_PKT_CMD_OEM        0x50 /* OEM                              */
-#define NCSI_PKT_CMD_PLDM       0x51 /* PLDM request over NCSI over RBT  */
-#define NCSI_PKT_CMD_GPUUID     0x52 /* Get package UUID                 */
-
-/* NCSI packet responses */
-#define NCSI_PKT_RSP_CIS        (NCSI_PKT_CMD_CIS    + 0x80)
-#define NCSI_PKT_RSP_SP         (NCSI_PKT_CMD_SP     + 0x80)
-#define NCSI_PKT_RSP_DP         (NCSI_PKT_CMD_DP     + 0x80)
-#define NCSI_PKT_RSP_EC         (NCSI_PKT_CMD_EC     + 0x80)
-#define NCSI_PKT_RSP_DC         (NCSI_PKT_CMD_DC     + 0x80)
-#define NCSI_PKT_RSP_RC         (NCSI_PKT_CMD_RC     + 0x80)
-#define NCSI_PKT_RSP_ECNT       (NCSI_PKT_CMD_ECNT   + 0x80)
-#define NCSI_PKT_RSP_DCNT       (NCSI_PKT_CMD_DCNT   + 0x80)
-#define NCSI_PKT_RSP_AE         (NCSI_PKT_CMD_AE     + 0x80)
-#define NCSI_PKT_RSP_SL         (NCSI_PKT_CMD_SL     + 0x80)
-#define NCSI_PKT_RSP_GLS        (NCSI_PKT_CMD_GLS    + 0x80)
-#define NCSI_PKT_RSP_SVF        (NCSI_PKT_CMD_SVF    + 0x80)
-#define NCSI_PKT_RSP_EV         (NCSI_PKT_CMD_EV     + 0x80)
-#define NCSI_PKT_RSP_DV         (NCSI_PKT_CMD_DV     + 0x80)
-#define NCSI_PKT_RSP_SMA        (NCSI_PKT_CMD_SMA    + 0x80)
-#define NCSI_PKT_RSP_EBF        (NCSI_PKT_CMD_EBF    + 0x80)
-#define NCSI_PKT_RSP_DBF        (NCSI_PKT_CMD_DBF    + 0x80)
-#define NCSI_PKT_RSP_EGMF       (NCSI_PKT_CMD_EGMF   + 0x80)
-#define NCSI_PKT_RSP_DGMF       (NCSI_PKT_CMD_DGMF   + 0x80)
-#define NCSI_PKT_RSP_SNFC       (NCSI_PKT_CMD_SNFC   + 0x80)
-#define NCSI_PKT_RSP_GVI        (NCSI_PKT_CMD_GVI    + 0x80)
-#define NCSI_PKT_RSP_GC         (NCSI_PKT_CMD_GC     + 0x80)
-#define NCSI_PKT_RSP_GP         (NCSI_PKT_CMD_GP     + 0x80)
-#define NCSI_PKT_RSP_GCPS       (NCSI_PKT_CMD_GCPS   + 0x80)
-#define NCSI_PKT_RSP_GNS        (NCSI_PKT_CMD_GNS    + 0x80)
-#define NCSI_PKT_RSP_GNPTS      (NCSI_PKT_CMD_GNPTS  + 0x80)
-#define NCSI_PKT_RSP_GPS        (NCSI_PKT_CMD_GPS    + 0x80)
-#define NCSI_PKT_RSP_OEM        (NCSI_PKT_CMD_OEM    + 0x80)
-#define NCSI_PKT_RSP_PLDM       (NCSI_PKT_CMD_PLDM   + 0x80)
-#define NCSI_PKT_RSP_GPUUID     (NCSI_PKT_CMD_GPUUID + 0x80)
-
-/* NCSI response code/reason */
-#define NCSI_PKT_RSP_C_COMPLETED        0x0000 /* Command Completed        */
-#define NCSI_PKT_RSP_C_FAILED           0x0001 /* Command Failed           */
-#define NCSI_PKT_RSP_C_UNAVAILABLE      0x0002 /* Command Unavailable      */
-#define NCSI_PKT_RSP_C_UNSUPPORTED      0x0003 /* Command Unsupported      */
-#define NCSI_PKT_RSP_R_NO_ERROR         0x0000 /* No Error                 */
-#define NCSI_PKT_RSP_R_INTERFACE        0x0001 /* Interface not ready      */
-#define NCSI_PKT_RSP_R_PARAM            0x0002 /* Invalid Parameter        */
-#define NCSI_PKT_RSP_R_CHANNEL          0x0003 /* Channel not Ready        */
-#define NCSI_PKT_RSP_R_PACKAGE          0x0004 /* Package not Ready        */
-#define NCSI_PKT_RSP_R_LENGTH           0x0005 /* Invalid payload length   */
-#define NCSI_PKT_RSP_R_UNKNOWN          0x7fff /* Command type unsupported */
-
-/* NCSI AEN packet type */
-#define NCSI_PKT_AEN            0xFF /* AEN Packet               */
-#define NCSI_PKT_AEN_LSC        0x00 /* Link status change       */
-#define NCSI_PKT_AEN_CR         0x01 /* Configuration required   */
-#define NCSI_PKT_AEN_HNCDSC     0x02 /* HNC driver status change */
-
-#endif /* NCSI_PKT_H */
diff --git a/slirp/src/ncsi.c b/slirp/src/ncsi.c
deleted file mode 100644
index 6d574ec..0000000
--- a/slirp/src/ncsi.c
+++ /dev/null
@@ -1,194 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * NC-SI (Network Controller Sideband Interface) "echo" model
- *
- * Copyright (C) 2016-2018 IBM Corp.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above
- * copyright notice, this list of conditions and the following
- * disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * 3. Neither the name of the copyright holder nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
- * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#include "slirp.h"
-
-#include "ncsi-pkt.h"
-
-static uint32_t ncsi_calculate_checksum(uint16_t *data, int len)
-{
-    uint32_t checksum = 0;
-    int i;
-
-    /*
-     * 32-bit unsigned sum of the NC-SI packet header and NC-SI packet
-     * payload interpreted as a series of 16-bit unsigned integer values.
-     */
-    for (i = 0; i < len; i++) {
-        checksum += htons(data[i]);
-    }
-
-    checksum = (~checksum + 1);
-    return checksum;
-}
-
-/* Get Capabilities */
-static int ncsi_rsp_handler_gc(struct ncsi_rsp_pkt_hdr *rnh)
-{
-    struct ncsi_rsp_gc_pkt *rsp = (struct ncsi_rsp_gc_pkt *) rnh;
-
-    rsp->cap = htonl(~0);
-    rsp->bc_cap = htonl(~0);
-    rsp->mc_cap = htonl(~0);
-    rsp->buf_cap = htonl(~0);
-    rsp->aen_cap = htonl(~0);
-    rsp->vlan_mode = 0xff;
-    rsp->uc_cnt = 2;
-    return 0;
-}
-
-/* Get Link status */
-static int ncsi_rsp_handler_gls(struct ncsi_rsp_pkt_hdr *rnh)
-{
-    struct ncsi_rsp_gls_pkt *rsp = (struct ncsi_rsp_gls_pkt *) rnh;
-
-    rsp->status = htonl(0x1);
-    return 0;
-}
-
-/* Get Parameters */
-static int ncsi_rsp_handler_gp(struct ncsi_rsp_pkt_hdr *rnh)
-{
-    struct ncsi_rsp_gp_pkt *rsp = (struct ncsi_rsp_gp_pkt *) rnh;
-
-    /* no MAC address filters or VLAN filters on the channel */
-    rsp->mac_cnt = 0;
-    rsp->mac_enable = 0;
-    rsp->vlan_cnt = 0;
-    rsp->vlan_enable = 0;
-
-    return 0;
-}
-
-static const struct ncsi_rsp_handler {
-        unsigned char   type;
-        int             payload;
-        int             (*handler)(struct ncsi_rsp_pkt_hdr *rnh);
-} ncsi_rsp_handlers[] = {
-        { NCSI_PKT_RSP_CIS,     4, NULL },
-        { NCSI_PKT_RSP_SP,      4, NULL },
-        { NCSI_PKT_RSP_DP,      4, NULL },
-        { NCSI_PKT_RSP_EC,      4, NULL },
-        { NCSI_PKT_RSP_DC,      4, NULL },
-        { NCSI_PKT_RSP_RC,      4, NULL },
-        { NCSI_PKT_RSP_ECNT,    4, NULL },
-        { NCSI_PKT_RSP_DCNT,    4, NULL },
-        { NCSI_PKT_RSP_AE,      4, NULL },
-        { NCSI_PKT_RSP_SL,      4, NULL },
-        { NCSI_PKT_RSP_GLS,    16, ncsi_rsp_handler_gls },
-        { NCSI_PKT_RSP_SVF,     4, NULL },
-        { NCSI_PKT_RSP_EV,      4, NULL },
-        { NCSI_PKT_RSP_DV,      4, NULL },
-        { NCSI_PKT_RSP_SMA,     4, NULL },
-        { NCSI_PKT_RSP_EBF,     4, NULL },
-        { NCSI_PKT_RSP_DBF,     4, NULL },
-        { NCSI_PKT_RSP_EGMF,    4, NULL },
-        { NCSI_PKT_RSP_DGMF,    4, NULL },
-        { NCSI_PKT_RSP_SNFC,    4, NULL },
-        { NCSI_PKT_RSP_GVI,    40, NULL },
-        { NCSI_PKT_RSP_GC,     32, ncsi_rsp_handler_gc },
-        { NCSI_PKT_RSP_GP,     40, ncsi_rsp_handler_gp },
-        { NCSI_PKT_RSP_GCPS,  172, NULL },
-        { NCSI_PKT_RSP_GNS,   172, NULL },
-        { NCSI_PKT_RSP_GNPTS, 172, NULL },
-        { NCSI_PKT_RSP_GPS,     8, NULL },
-        { NCSI_PKT_RSP_OEM,     0, NULL },
-        { NCSI_PKT_RSP_PLDM,    0, NULL },
-        { NCSI_PKT_RSP_GPUUID, 20, NULL }
-};
-
-/*
- * packet format : ncsi header + payload + checksum
- */
-#define NCSI_MAX_PAYLOAD 172
-#define NCSI_MAX_LEN     (sizeof(struct ncsi_pkt_hdr) + NCSI_MAX_PAYLOAD + 4)
-
-void ncsi_input(Slirp *slirp, const uint8_t *pkt, int pkt_len)
-{
-    struct ncsi_pkt_hdr *nh = (struct ncsi_pkt_hdr *)(pkt + ETH_HLEN);
-    uint8_t ncsi_reply[ETH_HLEN + NCSI_MAX_LEN];
-    struct ethhdr *reh = (struct ethhdr *)ncsi_reply;
-    struct ncsi_rsp_pkt_hdr *rnh = (struct ncsi_rsp_pkt_hdr *)
-        (ncsi_reply + ETH_HLEN);
-    const struct ncsi_rsp_handler *handler = NULL;
-    int i;
-    int ncsi_rsp_len = sizeof(*nh);
-    uint32_t checksum;
-    uint32_t *pchecksum;
-
-    memset(ncsi_reply, 0, sizeof(ncsi_reply));
-
-    memset(reh->h_dest, 0xff, ETH_ALEN);
-    memset(reh->h_source, 0xff, ETH_ALEN);
-    reh->h_proto = htons(ETH_P_NCSI);
-
-    for (i = 0; i < G_N_ELEMENTS(ncsi_rsp_handlers); i++) {
-        if (ncsi_rsp_handlers[i].type == nh->type + 0x80) {
-            handler = &ncsi_rsp_handlers[i];
-            break;
-        }
-    }
-
-    rnh->common.mc_id      = nh->mc_id;
-    rnh->common.revision   = NCSI_PKT_REVISION;
-    rnh->common.id         = nh->id;
-    rnh->common.type       = nh->type + 0x80;
-    rnh->common.channel    = nh->channel;
-
-    if (handler) {
-        rnh->common.length = htons(handler->payload);
-        rnh->code          = htons(NCSI_PKT_RSP_C_COMPLETED);
-        rnh->reason        = htons(NCSI_PKT_RSP_R_NO_ERROR);
-
-        if (handler->handler) {
-            /* TODO: handle errors */
-            handler->handler(rnh);
-        }
-        ncsi_rsp_len += handler->payload;
-    } else {
-        rnh->common.length = 0;
-        rnh->code          = htons(NCSI_PKT_RSP_C_UNAVAILABLE);
-        rnh->reason        = htons(NCSI_PKT_RSP_R_UNKNOWN);
-    }
-
-    /* Add the optional checksum at the end of the frame. */
-    checksum = ncsi_calculate_checksum((uint16_t *) rnh, ncsi_rsp_len);
-    pchecksum = (uint32_t *)((void *) rnh + ncsi_rsp_len);
-    *pchecksum = htonl(checksum);
-    ncsi_rsp_len += 4;
-
-    slirp_send_packet_all(slirp, ncsi_reply, ETH_HLEN + ncsi_rsp_len);
-}
diff --git a/slirp/src/ndp_table.c b/slirp/src/ndp_table.c
deleted file mode 100644
index 7832487..0000000
--- a/slirp/src/ndp_table.c
+++ /dev/null
@@ -1,87 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 2013
- * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
- */
-
-#include "slirp.h"
-
-void ndp_table_add(Slirp *slirp, struct in6_addr ip_addr,
-                    uint8_t ethaddr[ETH_ALEN])
-{
-    char addrstr[INET6_ADDRSTRLEN];
-    NdpTable *ndp_table = &slirp->ndp_table;
-    int i;
-
-    inet_ntop(AF_INET6, &(ip_addr), addrstr, INET6_ADDRSTRLEN);
-
-    DEBUG_CALL("ndp_table_add");
-    DEBUG_ARG("ip = %s", addrstr);
-    DEBUG_ARG("hw addr = %02x:%02x:%02x:%02x:%02x:%02x",
-              ethaddr[0], ethaddr[1], ethaddr[2],
-              ethaddr[3], ethaddr[4], ethaddr[5]);
-
-    if (IN6_IS_ADDR_MULTICAST(&ip_addr) || in6_zero(&ip_addr)) {
-        /* Do not register multicast or unspecified addresses */
-        DEBUG_CALL(" abort: do not register multicast or unspecified address");
-        return;
-    }
-
-    /* Search for an entry */
-    for (i = 0; i < NDP_TABLE_SIZE; i++) {
-        if (in6_equal(&ndp_table->table[i].ip_addr, &ip_addr)) {
-            DEBUG_CALL(" already in table: update the entry");
-            /* Update the entry */
-            memcpy(ndp_table->table[i].eth_addr, ethaddr, ETH_ALEN);
-            return;
-        }
-    }
-
-    /* No entry found, create a new one */
-    DEBUG_CALL(" create new entry");
-    ndp_table->table[ndp_table->next_victim].ip_addr = ip_addr;
-    memcpy(ndp_table->table[ndp_table->next_victim].eth_addr,
-            ethaddr, ETH_ALEN);
-    ndp_table->next_victim = (ndp_table->next_victim + 1) % NDP_TABLE_SIZE;
-}
-
-bool ndp_table_search(Slirp *slirp, struct in6_addr ip_addr,
-                      uint8_t out_ethaddr[ETH_ALEN])
-{
-    char addrstr[INET6_ADDRSTRLEN];
-    NdpTable *ndp_table = &slirp->ndp_table;
-    int i;
-
-    inet_ntop(AF_INET6, &(ip_addr), addrstr, INET6_ADDRSTRLEN);
-
-    DEBUG_CALL("ndp_table_search");
-    DEBUG_ARG("ip = %s", addrstr);
-
-    assert(!in6_zero(&ip_addr));
-
-    /* Multicast address: fec0::abcd:efgh/8 -> 33:33:ab:cd:ef:gh */
-    if (IN6_IS_ADDR_MULTICAST(&ip_addr)) {
-        out_ethaddr[0] = 0x33; out_ethaddr[1] = 0x33;
-        out_ethaddr[2] = ip_addr.s6_addr[12];
-        out_ethaddr[3] = ip_addr.s6_addr[13];
-        out_ethaddr[4] = ip_addr.s6_addr[14];
-        out_ethaddr[5] = ip_addr.s6_addr[15];
-        DEBUG_ARG("multicast addr = %02x:%02x:%02x:%02x:%02x:%02x",
-                  out_ethaddr[0], out_ethaddr[1], out_ethaddr[2],
-                  out_ethaddr[3], out_ethaddr[4], out_ethaddr[5]);
-        return 1;
-    }
-
-    for (i = 0; i < NDP_TABLE_SIZE; i++) {
-        if (in6_equal(&ndp_table->table[i].ip_addr, &ip_addr)) {
-            memcpy(out_ethaddr, ndp_table->table[i].eth_addr,  ETH_ALEN);
-            DEBUG_ARG("found hw addr = %02x:%02x:%02x:%02x:%02x:%02x",
-                      out_ethaddr[0], out_ethaddr[1], out_ethaddr[2],
-                      out_ethaddr[3], out_ethaddr[4], out_ethaddr[5]);
-            return 1;
-        }
-    }
-
-    DEBUG_CALL(" ip not found in table");
-    return 0;
-}
diff --git a/slirp/src/qtailq.h b/slirp/src/qtailq.h
deleted file mode 100644
index d8aa0e1..0000000
--- a/slirp/src/qtailq.h
+++ /dev/null
@@ -1,194 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*      $NetBSD: queue.h,v 1.52 2009/04/20 09:56:08 mschuett Exp $ */
-
-/*
- * slirp version: Copy from QEMU, removed all but tail queues.
- */
-
-/*
- * Copyright (c) 1991, 1993
- *      The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *      @(#)queue.h     8.5 (Berkeley) 8/20/94
- */
-
-#ifndef QTAILQ_H
-#define QTAILQ_H
-
-/*
- * A tail queue is headed by a pair of pointers, one to the head of the
- * list and the other to the tail of the list. The elements are doubly
- * linked so that an arbitrary element can be removed without a need to
- * traverse the list. New elements can be added to the list before or
- * after an existing element, at the head of the list, or at the end of
- * the list. A tail queue may be traversed in either direction.
- */
-typedef struct QTailQLink {
-    void *tql_next;
-    struct QTailQLink *tql_prev;
-} QTailQLink;
-
-/*
- * Tail queue definitions.  The union acts as a poor man template, as if
- * it were QTailQLink<type>.
- */
-#define QTAILQ_HEAD(name, type)                                         \
-    union name {                                                        \
-        struct type *tqh_first;       /* first element */               \
-        QTailQLink tqh_circ;          /* link for circular backwards list */ \
-    }
-
-#define QTAILQ_HEAD_INITIALIZER(head)           \
-    { .tqh_circ = { NULL, &(head).tqh_circ } }
-
-#define QTAILQ_ENTRY(type)                                              \
-    union {                                                             \
-        struct type *tqe_next;        /* next element */                \
-        QTailQLink tqe_circ;          /* link for circular backwards list */ \
-    }
-
-#define QTAILQ_INIT(head) do {                                          \
-        (head)->tqh_first = NULL;                                       \
-        (head)->tqh_circ.tql_prev = &(head)->tqh_circ;                  \
-} while (/*CONSTCOND*/0)
-
-#define QTAILQ_INSERT_HEAD(head, elm, field) do {                       \
-        if (((elm)->field.tqe_next = (head)->tqh_first) != NULL)        \
-            (head)->tqh_first->field.tqe_circ.tql_prev =                \
-                &(elm)->field.tqe_circ;                                 \
-        else                                                            \
-            (head)->tqh_circ.tql_prev = &(elm)->field.tqe_circ;         \
-        (head)->tqh_first = (elm);                                      \
-        (elm)->field.tqe_circ.tql_prev = &(head)->tqh_circ;             \
-} while (/*CONSTCOND*/0)
-
-#define QTAILQ_INSERT_TAIL(head, elm, field) do {                       \
-        (elm)->field.tqe_next = NULL;                                   \
-        (elm)->field.tqe_circ.tql_prev = (head)->tqh_circ.tql_prev;     \
-        (head)->tqh_circ.tql_prev->tql_next = (elm);                    \
-        (head)->tqh_circ.tql_prev = &(elm)->field.tqe_circ;             \
-} while (/*CONSTCOND*/0)
-
-#define QTAILQ_INSERT_AFTER(head, listelm, elm, field) do {             \
-        if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\
-            (elm)->field.tqe_next->field.tqe_circ.tql_prev =            \
-                &(elm)->field.tqe_circ;                                 \
-        else                                                            \
-            (head)->tqh_circ.tql_prev = &(elm)->field.tqe_circ;         \
-        (listelm)->field.tqe_next = (elm);                              \
-        (elm)->field.tqe_circ.tql_prev = &(listelm)->field.tqe_circ;    \
-} while (/*CONSTCOND*/0)
-
-#define QTAILQ_INSERT_BEFORE(listelm, elm, field) do {                       \
-        (elm)->field.tqe_circ.tql_prev = (listelm)->field.tqe_circ.tql_prev; \
-        (elm)->field.tqe_next = (listelm);                                   \
-        (listelm)->field.tqe_circ.tql_prev->tql_next = (elm);                \
-        (listelm)->field.tqe_circ.tql_prev = &(elm)->field.tqe_circ;         \
-} while (/*CONSTCOND*/0)
-
-#define QTAILQ_REMOVE(head, elm, field) do {                            \
-        if (((elm)->field.tqe_next) != NULL)                            \
-            (elm)->field.tqe_next->field.tqe_circ.tql_prev =            \
-                (elm)->field.tqe_circ.tql_prev;                         \
-        else                                                            \
-            (head)->tqh_circ.tql_prev = (elm)->field.tqe_circ.tql_prev; \
-        (elm)->field.tqe_circ.tql_prev->tql_next = (elm)->field.tqe_next; \
-        (elm)->field.tqe_circ.tql_prev = NULL;                          \
-} while (/*CONSTCOND*/0)
-
-#define QTAILQ_FOREACH(var, head, field)                                \
-        for ((var) = ((head)->tqh_first);                               \
-                (var);                                                  \
-                (var) = ((var)->field.tqe_next))
-
-#define QTAILQ_FOREACH_SAFE(var, head, field, next_var)                 \
-        for ((var) = ((head)->tqh_first);                               \
-                (var) && ((next_var) = ((var)->field.tqe_next), 1);     \
-                (var) = (next_var))
-
-#define QTAILQ_FOREACH_REVERSE(var, head, field)                        \
-        for ((var) = QTAILQ_LAST(head);                                 \
-                (var);                                                  \
-                (var) = QTAILQ_PREV(var, field))
-
-#define QTAILQ_FOREACH_REVERSE_SAFE(var, head, field, prev_var)         \
-        for ((var) = QTAILQ_LAST(head);                                 \
-             (var) && ((prev_var) = QTAILQ_PREV(var, field));           \
-             (var) = (prev_var))
-
-/*
- * Tail queue access methods.
- */
-#define QTAILQ_EMPTY(head)               ((head)->tqh_first == NULL)
-#define QTAILQ_FIRST(head)               ((head)->tqh_first)
-#define QTAILQ_NEXT(elm, field)          ((elm)->field.tqe_next)
-#define QTAILQ_IN_USE(elm, field)        ((elm)->field.tqe_circ.tql_prev != NULL)
-
-#define QTAILQ_LINK_PREV(link)                                          \
-        ((link).tql_prev->tql_prev->tql_next)
-#define QTAILQ_LAST(head)                                               \
-        ((typeof((head)->tqh_first)) QTAILQ_LINK_PREV((head)->tqh_circ))
-#define QTAILQ_PREV(elm, field)                                         \
-        ((typeof((elm)->field.tqe_next)) QTAILQ_LINK_PREV((elm)->field.tqe_circ))
-
-#define field_at_offset(base, offset, type)                                    \
-        ((type *) (((char *) (base)) + (offset)))
-
-/*
- * Raw access of elements of a tail queue head.  Offsets are all zero
- * because it's a union.
- */
-#define QTAILQ_RAW_FIRST(head)                                                 \
-        field_at_offset(head, 0, void *)
-#define QTAILQ_RAW_TQH_CIRC(head)                                              \
-        field_at_offset(head, 0, QTailQLink)
-
-/*
- * Raw access of elements of a tail entry
- */
-#define QTAILQ_RAW_NEXT(elm, entry)                                            \
-        field_at_offset(elm, entry, void *)
-#define QTAILQ_RAW_TQE_CIRC(elm, entry)                                        \
-        field_at_offset(elm, entry, QTailQLink)
-/*
- * Tail queue traversal using pointer arithmetic.
- */
-#define QTAILQ_RAW_FOREACH(elm, head, entry)                                   \
-        for ((elm) = *QTAILQ_RAW_FIRST(head);                                  \
-             (elm);                                                            \
-             (elm) = *QTAILQ_RAW_NEXT(elm, entry))
-/*
- * Tail queue insertion using pointer arithmetic.
- */
-#define QTAILQ_RAW_INSERT_TAIL(head, elm, entry) do {                           \
-        *QTAILQ_RAW_NEXT(elm, entry) = NULL;                                    \
-        QTAILQ_RAW_TQE_CIRC(elm, entry)->tql_prev = QTAILQ_RAW_TQH_CIRC(head)->tql_prev; \
-        QTAILQ_RAW_TQH_CIRC(head)->tql_prev->tql_next = (elm);                  \
-        QTAILQ_RAW_TQH_CIRC(head)->tql_prev = QTAILQ_RAW_TQE_CIRC(elm, entry);  \
-} while (/*CONSTCOND*/0)
-
-#endif /* QTAILQ_H */
diff --git a/slirp/src/sbuf.c b/slirp/src/sbuf.c
deleted file mode 100644
index 9c0b31b..0000000
--- a/slirp/src/sbuf.c
+++ /dev/null
@@ -1,186 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1995 Danny Gasparovski.
- */
-
-#include "slirp.h"
-
-static void sbappendsb(struct sbuf *sb, struct mbuf *m);
-
-void
-sbfree(struct sbuf *sb)
-{
-	free(sb->sb_data);
-}
-
-bool
-sbdrop(struct sbuf *sb, int num)
-{
-    int limit = sb->sb_datalen / 2;
-
-	/*
-	 * We can only drop how much we have
-	 * This should never succeed
-	 */
-	if(num > sb->sb_cc)
-		num = sb->sb_cc;
-	sb->sb_cc -= num;
-	sb->sb_rptr += num;
-	if(sb->sb_rptr >= sb->sb_data + sb->sb_datalen)
-		sb->sb_rptr -= sb->sb_datalen;
-
-    if (sb->sb_cc < limit && sb->sb_cc + num >= limit) {
-        return true;
-    }
-
-    return false;
-}
-
-void
-sbreserve(struct sbuf *sb, int size)
-{
-	if (sb->sb_data) {
-		/* Already alloced, realloc if necessary */
-		if (sb->sb_datalen != size) {
-			sb->sb_wptr = sb->sb_rptr = sb->sb_data = (char *)realloc(sb->sb_data, size);
-			sb->sb_cc = 0;
-			if (sb->sb_wptr)
-			   sb->sb_datalen = size;
-			else
-			   sb->sb_datalen = 0;
-		}
-	} else {
-		sb->sb_wptr = sb->sb_rptr = sb->sb_data = (char *)malloc(size);
-		sb->sb_cc = 0;
-		if (sb->sb_wptr)
-		   sb->sb_datalen = size;
-		else
-		   sb->sb_datalen = 0;
-	}
-}
-
-/*
- * Try and write() to the socket, whatever doesn't get written
- * append to the buffer... for a host with a fast net connection,
- * this prevents an unnecessary copy of the data
- * (the socket is non-blocking, so we won't hang)
- */
-void
-sbappend(struct socket *so, struct mbuf *m)
-{
-	int ret = 0;
-
-	DEBUG_CALL("sbappend");
-	DEBUG_ARG("so = %p", so);
-	DEBUG_ARG("m = %p", m);
-	DEBUG_ARG("m->m_len = %d", m->m_len);
-
-	/* Shouldn't happen, but...  e.g. foreign host closes connection */
-	if (m->m_len <= 0) {
-		m_free(m);
-		return;
-	}
-
-	/*
-	 * If there is urgent data, call sosendoob
-	 * if not all was sent, sowrite will take care of the rest
-	 * (The rest of this function is just an optimisation)
-	 */
-	if (so->so_urgc) {
-		sbappendsb(&so->so_rcv, m);
-		m_free(m);
-		(void)sosendoob(so);
-		return;
-	}
-
-	/*
-	 * We only write if there's nothing in the buffer,
-	 * ottherwise it'll arrive out of order, and hence corrupt
-	 */
-	if (!so->so_rcv.sb_cc)
-	   ret = slirp_send(so, m->m_data, m->m_len, 0);
-
-	if (ret <= 0) {
-		/*
-		 * Nothing was written
-		 * It's possible that the socket has closed, but
-		 * we don't need to check because if it has closed,
-		 * it will be detected in the normal way by soread()
-		 */
-		sbappendsb(&so->so_rcv, m);
-	} else if (ret != m->m_len) {
-		/*
-		 * Something was written, but not everything..
-		 * sbappendsb the rest
-		 */
-		m->m_len -= ret;
-		m->m_data += ret;
-		sbappendsb(&so->so_rcv, m);
-	} /* else */
-	/* Whatever happened, we free the mbuf */
-	m_free(m);
-}
-
-/*
- * Copy the data from m into sb
- * The caller is responsible to make sure there's enough room
- */
-static void
-sbappendsb(struct sbuf *sb, struct mbuf *m)
-{
-	int len, n,  nn;
-
-	len = m->m_len;
-
-	if (sb->sb_wptr < sb->sb_rptr) {
-		n = sb->sb_rptr - sb->sb_wptr;
-		if (n > len) n = len;
-		memcpy(sb->sb_wptr, m->m_data, n);
-	} else {
-		/* Do the right edge first */
-		n = sb->sb_data + sb->sb_datalen - sb->sb_wptr;
-		if (n > len) n = len;
-		memcpy(sb->sb_wptr, m->m_data, n);
-		len -= n;
-		if (len) {
-			/* Now the left edge */
-			nn = sb->sb_rptr - sb->sb_data;
-			if (nn > len) nn = len;
-			memcpy(sb->sb_data,m->m_data+n,nn);
-			n += nn;
-		}
-	}
-
-	sb->sb_cc += n;
-	sb->sb_wptr += n;
-	if (sb->sb_wptr >= sb->sb_data + sb->sb_datalen)
-		sb->sb_wptr -= sb->sb_datalen;
-}
-
-/*
- * Copy data from sbuf to a normal, straight buffer
- * Don't update the sbuf rptr, this will be
- * done in sbdrop when the data is acked
- */
-void
-sbcopy(struct sbuf *sb, int off, int len, char *to)
-{
-	char *from;
-
-	from = sb->sb_rptr + off;
-	if (from >= sb->sb_data + sb->sb_datalen)
-		from -= sb->sb_datalen;
-
-	if (from < sb->sb_wptr) {
-		if (len > sb->sb_cc) len = sb->sb_cc;
-		memcpy(to,from,len);
-	} else {
-		/* re-use off */
-		off = (sb->sb_data + sb->sb_datalen) - from;
-		if (off > len) off = len;
-		memcpy(to,from,off);
-		len -= off;
-		if (len)
-		   memcpy(to+off,sb->sb_data,len);
-	}
-}
diff --git a/slirp/src/sbuf.h b/slirp/src/sbuf.h
deleted file mode 100644
index 337af1b..0000000
--- a/slirp/src/sbuf.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1995 Danny Gasparovski.
- */
-
-#ifndef SBUF_H
-#define SBUF_H
-
-#define sbspace(sb) ((sb)->sb_datalen - (sb)->sb_cc)
-
-struct sbuf {
-	uint32_t sb_cc;		/* actual chars in buffer */
-	uint32_t sb_datalen;	/* Length of data  */
-	char	*sb_wptr;	/* write pointer. points to where the next
-				 * bytes should be written in the sbuf */
-	char	*sb_rptr;	/* read pointer. points to where the next
-				 * byte should be read from the sbuf */
-	char	*sb_data;	/* Actual data */
-};
-
-void sbfree(struct sbuf *);
-bool sbdrop(struct sbuf *, int);
-void sbreserve(struct sbuf *, int);
-void sbappend(struct socket *, struct mbuf *);
-void sbcopy(struct sbuf *, int, int, char *);
-
-#endif
diff --git a/slirp/src/slirp.c b/slirp/src/slirp.c
deleted file mode 100644
index 169c85b..0000000
--- a/slirp/src/slirp.c
+++ /dev/null
@@ -1,1118 +0,0 @@
-/* SPDX-License-Identifier: MIT */
-/*
- * libslirp glue
- *
- * Copyright (c) 2004-2008 Fabrice Bellard
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-#include "slirp.h"
-
-
-#ifndef _WIN32
-#include <net/if.h>
-#endif
-
-int slirp_debug;
-
-/* Define to 1 if you want KEEPALIVE timers */
-bool slirp_do_keepalive;
-
-/* host loopback address */
-struct in_addr loopback_addr;
-/* host loopback network mask */
-unsigned long loopback_mask;
-
-/* emulated hosts use the MAC addr 52:55:IP:IP:IP:IP */
-static const uint8_t special_ethaddr[ETH_ALEN] = {
-    0x52, 0x55, 0x00, 0x00, 0x00, 0x00
-};
-
-unsigned curtime;
-
-static struct in_addr dns_addr;
-#ifndef _WIN32
-static struct in6_addr dns6_addr;
-#endif
-static unsigned dns_addr_time;
-#ifndef _WIN32
-static unsigned dns6_addr_time;
-#endif
-
-#define TIMEOUT_FAST 2  /* milliseconds */
-#define TIMEOUT_SLOW 499  /* milliseconds */
-/* for the aging of certain requests like DNS */
-#define TIMEOUT_DEFAULT 1000  /* milliseconds */
-
-#ifdef _WIN32
-
-int get_dns_addr(struct in_addr *pdns_addr)
-{
-    FIXED_INFO *FixedInfo=NULL;
-    ULONG    BufLen;
-    DWORD    ret;
-    IP_ADDR_STRING *pIPAddr;
-    struct in_addr tmp_addr;
-
-    if (dns_addr.s_addr != 0 && (curtime - dns_addr_time) < TIMEOUT_DEFAULT) {
-        *pdns_addr = dns_addr;
-        return 0;
-    }
-
-    FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO));
-    BufLen = sizeof(FIXED_INFO);
-
-    if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen)) {
-        if (FixedInfo) {
-            GlobalFree(FixedInfo);
-            FixedInfo = NULL;
-        }
-        FixedInfo = GlobalAlloc(GPTR, BufLen);
-    }
-
-    if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS) {
-        printf("GetNetworkParams failed. ret = %08x\n", (unsigned)ret );
-        if (FixedInfo) {
-            GlobalFree(FixedInfo);
-            FixedInfo = NULL;
-        }
-        return -1;
-    }
-
-    pIPAddr = &(FixedInfo->DnsServerList);
-    inet_aton(pIPAddr->IpAddress.String, &tmp_addr);
-    *pdns_addr = tmp_addr;
-    dns_addr = tmp_addr;
-    dns_addr_time = curtime;
-    if (FixedInfo) {
-        GlobalFree(FixedInfo);
-        FixedInfo = NULL;
-    }
-    return 0;
-}
-
-int get_dns6_addr(struct in6_addr *pdns6_addr, uint32_t *scope_id)
-{
-    return -1;
-}
-
-static void winsock_cleanup(void)
-{
-    WSACleanup();
-}
-
-#else
-
-static int get_dns_addr_cached(void *pdns_addr, void *cached_addr,
-                               socklen_t addrlen,
-                               struct stat *cached_stat, unsigned *cached_time)
-{
-    struct stat old_stat;
-    if (curtime - *cached_time < TIMEOUT_DEFAULT) {
-        memcpy(pdns_addr, cached_addr, addrlen);
-        return 0;
-    }
-    old_stat = *cached_stat;
-    if (stat("/etc/resolv.conf", cached_stat) != 0) {
-        return -1;
-    }
-    if (cached_stat->st_dev == old_stat.st_dev
-        && cached_stat->st_ino == old_stat.st_ino
-        && cached_stat->st_size == old_stat.st_size
-        && cached_stat->st_mtime == old_stat.st_mtime) {
-        memcpy(pdns_addr, cached_addr, addrlen);
-        return 0;
-    }
-    return 1;
-}
-
-static int get_dns_addr_resolv_conf(int af, void *pdns_addr, void *cached_addr,
-                                    socklen_t addrlen, uint32_t *scope_id,
-                                    unsigned *cached_time)
-{
-    char buff[512];
-    char buff2[257];
-    FILE *f;
-    int found = 0;
-    void *tmp_addr = alloca(addrlen);
-    unsigned if_index;
-
-    f = fopen("/etc/resolv.conf", "r");
-    if (!f)
-        return -1;
-
-    DEBUG_MISC("IP address of your DNS(s):");
-    while (fgets(buff, 512, f) != NULL) {
-        if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) {
-            char *c = strchr(buff2, '%');
-            if (c) {
-                if_index = if_nametoindex(c + 1);
-                *c = '\0';
-            } else {
-                if_index = 0;
-            }
-
-            if (!inet_pton(af, buff2, tmp_addr)) {
-                continue;
-            }
-            /* If it's the first one, set it to dns_addr */
-            if (!found) {
-                memcpy(pdns_addr, tmp_addr, addrlen);
-                memcpy(cached_addr, tmp_addr, addrlen);
-                if (scope_id) {
-                    *scope_id = if_index;
-                }
-                *cached_time = curtime;
-            }
-
-            if (++found > 3) {
-                DEBUG_MISC("  (more)");
-                break;
-            } else if (slirp_debug & DBG_MISC) {
-                char s[INET6_ADDRSTRLEN];
-                const char *res = inet_ntop(af, tmp_addr, s, sizeof(s));
-                if (!res) {
-                    res = "  (string conversion error)";
-                }
-                DEBUG_MISC("  %s", res);
-            }
-        }
-    }
-    fclose(f);
-    if (!found)
-        return -1;
-    return 0;
-}
-
-int get_dns_addr(struct in_addr *pdns_addr)
-{
-    static struct stat dns_addr_stat;
-
-    if (dns_addr.s_addr != 0) {
-        int ret;
-        ret = get_dns_addr_cached(pdns_addr, &dns_addr, sizeof(dns_addr),
-                                  &dns_addr_stat, &dns_addr_time);
-        if (ret <= 0) {
-            return ret;
-        }
-    }
-    return get_dns_addr_resolv_conf(AF_INET, pdns_addr, &dns_addr,
-                                    sizeof(dns_addr), NULL, &dns_addr_time);
-}
-
-int get_dns6_addr(struct in6_addr *pdns6_addr, uint32_t *scope_id)
-{
-    static struct stat dns6_addr_stat;
-
-    if (!in6_zero(&dns6_addr)) {
-        int ret;
-        ret = get_dns_addr_cached(pdns6_addr, &dns6_addr, sizeof(dns6_addr),
-                                  &dns6_addr_stat, &dns6_addr_time);
-        if (ret <= 0) {
-            return ret;
-        }
-    }
-    return get_dns_addr_resolv_conf(AF_INET6, pdns6_addr, &dns6_addr,
-                                    sizeof(dns6_addr),
-                                    scope_id, &dns6_addr_time);
-}
-
-#endif
-
-static void slirp_init_once(void)
-{
-    static int initialized;
-    const char *debug;
-#ifdef _WIN32
-    WSADATA Data;
-#endif
-
-    if (initialized) {
-        return;
-    }
-    initialized = 1;
-
-#ifdef _WIN32
-    WSAStartup(MAKEWORD(2,0), &Data);
-    atexit(winsock_cleanup);
-#endif
-
-    loopback_addr.s_addr = htonl(INADDR_LOOPBACK);
-    loopback_mask = htonl(IN_CLASSA_NET);
-
-    debug = g_getenv("SLIRP_DEBUG");
-    if (debug) {
-        const GDebugKey keys[] = {
-            { "call", DBG_CALL },
-            { "misc", DBG_MISC },
-            { "error", DBG_ERROR },
-            { "tftp", DBG_TFTP },
-        };
-        slirp_debug = g_parse_debug_string(debug, keys, G_N_ELEMENTS(keys));
-    }
-
-
-}
-
-Slirp *slirp_init(int restricted, bool in_enabled, struct in_addr vnetwork,
-                  struct in_addr vnetmask, struct in_addr vhost,
-                  bool in6_enabled,
-                  struct in6_addr vprefix_addr6, uint8_t vprefix_len,
-                  struct in6_addr vhost6, const char *vhostname,
-                  const char *tftp_server_name,
-                  const char *tftp_path, const char *bootfile,
-                  struct in_addr vdhcp_start, struct in_addr vnameserver,
-                  struct in6_addr vnameserver6, const char **vdnssearch,
-                  const char *vdomainname,
-                  const SlirpCb *callbacks,
-                  void *opaque)
-{
-    Slirp *slirp = g_malloc0(sizeof(Slirp));
-
-    slirp_init_once();
-
-    slirp->opaque = opaque;
-    slirp->cb = callbacks;
-    slirp->grand = g_rand_new();
-    slirp->restricted = restricted;
-
-    slirp->in_enabled = in_enabled;
-    slirp->in6_enabled = in6_enabled;
-
-    if_init(slirp);
-    ip_init(slirp);
-    ip6_init(slirp);
-
-    /* Initialise mbufs *after* setting the MTU */
-    m_init(slirp);
-
-    slirp->vnetwork_addr = vnetwork;
-    slirp->vnetwork_mask = vnetmask;
-    slirp->vhost_addr = vhost;
-    slirp->vprefix_addr6 = vprefix_addr6;
-    slirp->vprefix_len = vprefix_len;
-    slirp->vhost_addr6 = vhost6;
-    if (vhostname) {
-        slirp_pstrcpy(slirp->client_hostname, sizeof(slirp->client_hostname),
-                      vhostname);
-    }
-    slirp->tftp_prefix = g_strdup(tftp_path);
-    slirp->bootp_filename = g_strdup(bootfile);
-    slirp->vdomainname = g_strdup(vdomainname);
-    slirp->vdhcp_startaddr = vdhcp_start;
-    slirp->vnameserver_addr = vnameserver;
-    slirp->vnameserver_addr6 = vnameserver6;
-    slirp->tftp_server_name = g_strdup(tftp_server_name);
-
-    if (vdnssearch) {
-        translate_dnssearch(slirp, vdnssearch);
-    }
-
-    return slirp;
-}
-
-void slirp_cleanup(Slirp *slirp)
-{
-    struct gfwd_list *e, *next;
-
-    for (e = slirp->guestfwd_list; e; e = next) {
-        next = e->ex_next;
-        g_free(e->ex_exec);
-        g_free(e);
-    }
-
-    ip_cleanup(slirp);
-    ip6_cleanup(slirp);
-    m_cleanup(slirp);
-
-    g_rand_free(slirp->grand);
-
-    g_free(slirp->vdnssearch);
-    g_free(slirp->tftp_prefix);
-    g_free(slirp->bootp_filename);
-    g_free(slirp->vdomainname);
-    g_free(slirp);
-}
-
-#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
-#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
-
-static void slirp_update_timeout(Slirp *slirp, uint32_t *timeout)
-{
-    uint32_t t;
-
-    if (*timeout <= TIMEOUT_FAST) {
-        return;
-    }
-
-    t = MIN(1000, *timeout);
-
-    /* If we have tcp timeout with slirp, then we will fill @timeout with
-     * more precise value.
-     */
-    if (slirp->time_fasttimo) {
-        *timeout = TIMEOUT_FAST;
-        return;
-    }
-    if (slirp->do_slowtimo) {
-        t = MIN(TIMEOUT_SLOW, t);
-    }
-    *timeout = t;
-}
-
-void slirp_pollfds_fill(Slirp *slirp, uint32_t *timeout,
-                        SlirpAddPollCb add_poll, void *opaque)
-{
-    struct socket *so, *so_next;
-
-    /*
-     * First, TCP sockets
-     */
-
-    /*
-     * *_slowtimo needs calling if there are IP fragments
-     * in the fragment queue, or there are TCP connections active
-     */
-    slirp->do_slowtimo = ((slirp->tcb.so_next != &slirp->tcb) ||
-                          (&slirp->ipq.ip_link != slirp->ipq.ip_link.next));
-
-    for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so_next) {
-        int events = 0;
-
-        so_next = so->so_next;
-
-        so->pollfds_idx = -1;
-
-        /*
-         * See if we need a tcp_fasttimo
-         */
-        if (slirp->time_fasttimo == 0 &&
-            so->so_tcpcb->t_flags & TF_DELACK) {
-            slirp->time_fasttimo = curtime; /* Flag when want a fasttimo */
-        }
-
-        /*
-         * NOFDREF can include still connecting to local-host,
-         * newly socreated() sockets etc. Don't want to select these.
-         */
-        if (so->so_state & SS_NOFDREF || so->s == -1) {
-            continue;
-        }
-
-        /*
-         * Set for reading sockets which are accepting
-         */
-        if (so->so_state & SS_FACCEPTCONN) {
-            so->pollfds_idx = add_poll(so->s,
-                SLIRP_POLL_IN | SLIRP_POLL_HUP | SLIRP_POLL_ERR, opaque);
-            continue;
-        }
-
-        /*
-         * Set for writing sockets which are connecting
-         */
-        if (so->so_state & SS_ISFCONNECTING) {
-            so->pollfds_idx = add_poll(so->s,
-                SLIRP_POLL_OUT | SLIRP_POLL_ERR, opaque);
-            continue;
-        }
-
-        /*
-         * Set for writing if we are connected, can send more, and
-         * we have something to send
-         */
-        if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) {
-            events |= SLIRP_POLL_OUT | SLIRP_POLL_ERR;
-        }
-
-        /*
-         * Set for reading (and urgent data) if we are connected, can
-         * receive more, and we have room for it XXX /2 ?
-         */
-        if (CONN_CANFRCV(so) &&
-            (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) {
-            events |= SLIRP_POLL_IN | SLIRP_POLL_HUP |
-                      SLIRP_POLL_ERR | SLIRP_POLL_PRI;
-        }
-
-        if (events) {
-            so->pollfds_idx = add_poll(so->s, events, opaque);
-        }
-    }
-
-    /*
-     * UDP sockets
-     */
-    for (so = slirp->udb.so_next; so != &slirp->udb; so = so_next) {
-        so_next = so->so_next;
-
-        so->pollfds_idx = -1;
-
-        /*
-         * See if it's timed out
-         */
-        if (so->so_expire) {
-            if (so->so_expire <= curtime) {
-                udp_detach(so);
-                continue;
-            } else {
-                slirp->do_slowtimo = true; /* Let socket expire */
-            }
-        }
-
-        /*
-         * When UDP packets are received from over the
-         * link, they're sendto()'d straight away, so
-         * no need for setting for writing
-         * Limit the number of packets queued by this session
-         * to 4.  Note that even though we try and limit this
-         * to 4 packets, the session could have more queued
-         * if the packets needed to be fragmented
-         * (XXX <= 4 ?)
-         */
-        if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) {
-            so->pollfds_idx = add_poll(so->s,
-                SLIRP_POLL_IN | SLIRP_POLL_HUP | SLIRP_POLL_ERR, opaque);
-        }
-    }
-
-    /*
-     * ICMP sockets
-     */
-    for (so = slirp->icmp.so_next; so != &slirp->icmp; so = so_next) {
-        so_next = so->so_next;
-
-        so->pollfds_idx = -1;
-
-        /*
-         * See if it's timed out
-         */
-        if (so->so_expire) {
-            if (so->so_expire <= curtime) {
-                icmp_detach(so);
-                continue;
-            } else {
-                slirp->do_slowtimo = true; /* Let socket expire */
-            }
-        }
-
-        if (so->so_state & SS_ISFCONNECTED) {
-            so->pollfds_idx = add_poll(so->s,
-                SLIRP_POLL_IN | SLIRP_POLL_HUP | SLIRP_POLL_ERR, opaque);
-        }
-    }
-
-    slirp_update_timeout(slirp, timeout);
-}
-
-void slirp_pollfds_poll(Slirp *slirp, int select_error,
-                        SlirpGetREventsCb get_revents, void *opaque)
-{
-    struct socket *so, *so_next;
-    int ret;
-
-    curtime = slirp->cb->clock_get_ns(slirp->opaque) / SCALE_MS;
-
-    /*
-     * See if anything has timed out
-     */
-    if (slirp->time_fasttimo &&
-        ((curtime - slirp->time_fasttimo) >= TIMEOUT_FAST)) {
-        tcp_fasttimo(slirp);
-        slirp->time_fasttimo = 0;
-    }
-    if (slirp->do_slowtimo &&
-        ((curtime - slirp->last_slowtimo) >= TIMEOUT_SLOW)) {
-        ip_slowtimo(slirp);
-        tcp_slowtimo(slirp);
-        slirp->last_slowtimo = curtime;
-    }
-
-    /*
-     * Check sockets
-     */
-    if (!select_error) {
-        /*
-         * Check TCP sockets
-         */
-        for (so = slirp->tcb.so_next; so != &slirp->tcb;
-             so = so_next) {
-            int revents;
-
-            so_next = so->so_next;
-
-            revents = 0;
-            if (so->pollfds_idx != -1) {
-                revents = get_revents(so->pollfds_idx, opaque);
-            }
-
-            if (so->so_state & SS_NOFDREF || so->s == -1) {
-                continue;
-            }
-
-            /*
-             * Check for URG data
-             * This will soread as well, so no need to
-             * test for SLIRP_POLL_IN below if this succeeds
-             */
-            if (revents & SLIRP_POLL_PRI) {
-                ret = sorecvoob(so);
-                if (ret < 0) {
-                    /* Socket error might have resulted in the socket being
-                     * removed, do not try to do anything more with it. */
-                    continue;
-                }
-            }
-            /*
-             * Check sockets for reading
-             */
-            else if (revents &
-                     (SLIRP_POLL_IN | SLIRP_POLL_HUP | SLIRP_POLL_ERR)) {
-                /*
-                 * Check for incoming connections
-                 */
-                if (so->so_state & SS_FACCEPTCONN) {
-                    tcp_connect(so);
-                    continue;
-                } /* else */
-                ret = soread(so);
-
-                /* Output it if we read something */
-                if (ret > 0) {
-                    tcp_output(sototcpcb(so));
-                }
-                if (ret < 0) {
-                    /* Socket error might have resulted in the socket being
-                     * removed, do not try to do anything more with it. */
-                    continue;
-                }
-            }
-
-            /*
-             * Check sockets for writing
-             */
-            if (!(so->so_state & SS_NOFDREF) &&
-                (revents & (SLIRP_POLL_OUT | SLIRP_POLL_ERR))) {
-                /*
-                 * Check for non-blocking, still-connecting sockets
-                 */
-                if (so->so_state & SS_ISFCONNECTING) {
-                    /* Connected */
-                    so->so_state &= ~SS_ISFCONNECTING;
-
-                    ret = send(so->s, (const void *) &ret, 0, 0);
-                    if (ret < 0) {
-                        /* XXXXX Must fix, zero bytes is a NOP */
-                        if (errno == EAGAIN || errno == EWOULDBLOCK ||
-                            errno == EINPROGRESS || errno == ENOTCONN) {
-                            continue;
-                        }
-
-                        /* else failed */
-                        so->so_state &= SS_PERSISTENT_MASK;
-                        so->so_state |= SS_NOFDREF;
-                    }
-                    /* else so->so_state &= ~SS_ISFCONNECTING; */
-
-                    /*
-                     * Continue tcp_input
-                     */
-                    tcp_input((struct mbuf *)NULL, sizeof(struct ip), so,
-                              so->so_ffamily);
-                    /* continue; */
-                } else {
-                    ret = sowrite(so);
-                    if (ret > 0) {
-                        /* Call tcp_output in case we need to send a window
-                         * update to the guest, otherwise it will be stuck
-                         * until it sends a window probe. */
-                        tcp_output(sototcpcb(so));
-                    }
-                }
-            }
-        }
-
-        /*
-         * Now UDP sockets.
-         * Incoming packets are sent straight away, they're not buffered.
-         * Incoming UDP data isn't buffered either.
-         */
-        for (so = slirp->udb.so_next; so != &slirp->udb;
-             so = so_next) {
-            int revents;
-
-            so_next = so->so_next;
-
-            revents = 0;
-            if (so->pollfds_idx != -1) {
-                revents = get_revents(so->pollfds_idx, opaque);
-            }
-
-            if (so->s != -1 &&
-                (revents & (SLIRP_POLL_IN | SLIRP_POLL_HUP | SLIRP_POLL_ERR))) {
-                sorecvfrom(so);
-            }
-        }
-
-        /*
-         * Check incoming ICMP relies.
-         */
-        for (so = slirp->icmp.so_next; so != &slirp->icmp;
-             so = so_next) {
-            int revents;
-
-            so_next = so->so_next;
-
-            revents = 0;
-            if (so->pollfds_idx != -1) {
-                revents = get_revents(so->pollfds_idx, opaque);
-            }
-
-            if (so->s != -1 &&
-                (revents & (SLIRP_POLL_IN | SLIRP_POLL_HUP | SLIRP_POLL_ERR))) {
-                icmp_receive(so);
-            }
-        }
-    }
-
-    if_start(slirp);
-}
-
-static void arp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len)
-{
-    struct slirp_arphdr *ah = (struct slirp_arphdr *)(pkt + ETH_HLEN);
-    uint8_t arp_reply[MAX(ETH_HLEN + sizeof(struct slirp_arphdr), 64)];
-    struct ethhdr *reh = (struct ethhdr *)arp_reply;
-    struct slirp_arphdr *rah = (struct slirp_arphdr *)(arp_reply + ETH_HLEN);
-    int ar_op;
-    struct gfwd_list *ex_ptr;
-
-    if (!slirp->in_enabled) {
-        return;
-    }
-
-    ar_op = ntohs(ah->ar_op);
-    switch(ar_op) {
-    case ARPOP_REQUEST:
-        if (ah->ar_tip == ah->ar_sip) {
-            /* Gratuitous ARP */
-            arp_table_add(slirp, ah->ar_sip, ah->ar_sha);
-            return;
-        }
-
-        if ((ah->ar_tip & slirp->vnetwork_mask.s_addr) ==
-            slirp->vnetwork_addr.s_addr) {
-            if (ah->ar_tip == slirp->vnameserver_addr.s_addr ||
-                ah->ar_tip == slirp->vhost_addr.s_addr)
-                goto arp_ok;
-            /* TODO: IPv6 */
-            for (ex_ptr = slirp->guestfwd_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
-                if (ex_ptr->ex_addr.s_addr == ah->ar_tip)
-                    goto arp_ok;
-            }
-            return;
-        arp_ok:
-            memset(arp_reply, 0, sizeof(arp_reply));
-
-            arp_table_add(slirp, ah->ar_sip, ah->ar_sha);
-
-            /* ARP request for alias/dns mac address */
-            memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN);
-            memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 4);
-            memcpy(&reh->h_source[2], &ah->ar_tip, 4);
-            reh->h_proto = htons(ETH_P_ARP);
-
-            rah->ar_hrd = htons(1);
-            rah->ar_pro = htons(ETH_P_IP);
-            rah->ar_hln = ETH_ALEN;
-            rah->ar_pln = 4;
-            rah->ar_op = htons(ARPOP_REPLY);
-            memcpy(rah->ar_sha, reh->h_source, ETH_ALEN);
-            rah->ar_sip = ah->ar_tip;
-            memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
-            rah->ar_tip = ah->ar_sip;
-            slirp_send_packet_all(slirp, arp_reply, sizeof(arp_reply));
-        }
-        break;
-    case ARPOP_REPLY:
-        arp_table_add(slirp, ah->ar_sip, ah->ar_sha);
-        break;
-    default:
-        break;
-    }
-}
-
-void slirp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len)
-{
-    struct mbuf *m;
-    int proto;
-
-    if (pkt_len < ETH_HLEN)
-        return;
-
-    proto = (((uint16_t) pkt[12]) << 8) + pkt[13];
-    switch(proto) {
-    case ETH_P_ARP:
-        arp_input(slirp, pkt, pkt_len);
-        break;
-    case ETH_P_IP:
-    case ETH_P_IPV6:
-        m = m_get(slirp);
-        if (!m)
-            return;
-        /* Note: we add 2 to align the IP header on 4 bytes,
-         * and add the margin for the tcpiphdr overhead  */
-        if (M_FREEROOM(m) < pkt_len + TCPIPHDR_DELTA + 2) {
-            m_inc(m, pkt_len + TCPIPHDR_DELTA + 2);
-        }
-        m->m_len = pkt_len + TCPIPHDR_DELTA + 2;
-        memcpy(m->m_data + TCPIPHDR_DELTA + 2, pkt, pkt_len);
-
-        m->m_data += TCPIPHDR_DELTA + 2 + ETH_HLEN;
-        m->m_len -= TCPIPHDR_DELTA + 2 + ETH_HLEN;
-
-        if (proto == ETH_P_IP) {
-            ip_input(m);
-        } else if (proto == ETH_P_IPV6) {
-            ip6_input(m);
-        }
-        break;
-
-    case ETH_P_NCSI:
-        ncsi_input(slirp, pkt, pkt_len);
-        break;
-
-    default:
-        break;
-    }
-}
-
-/* Prepare the IPv4 packet to be sent to the ethernet device. Returns 1 if no
- * packet should be sent, 0 if the packet must be re-queued, 2 if the packet
- * is ready to go.
- */
-static int if_encap4(Slirp *slirp, struct mbuf *ifm, struct ethhdr *eh,
-        uint8_t ethaddr[ETH_ALEN])
-{
-    const struct ip *iph = (const struct ip *)ifm->m_data;
-
-    if (iph->ip_dst.s_addr == 0) {
-        /* 0.0.0.0 can not be a destination address, something went wrong,
-         * avoid making it worse */
-        return 1;
-    }
-    if (!arp_table_search(slirp, iph->ip_dst.s_addr, ethaddr)) {
-        uint8_t arp_req[ETH_HLEN + sizeof(struct slirp_arphdr)];
-        struct ethhdr *reh = (struct ethhdr *)arp_req;
-        struct slirp_arphdr *rah = (struct slirp_arphdr *)(arp_req + ETH_HLEN);
-
-        if (!ifm->resolution_requested) {
-            /* If the client addr is not known, send an ARP request */
-            memset(reh->h_dest, 0xff, ETH_ALEN);
-            memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 4);
-            memcpy(&reh->h_source[2], &slirp->vhost_addr, 4);
-            reh->h_proto = htons(ETH_P_ARP);
-            rah->ar_hrd = htons(1);
-            rah->ar_pro = htons(ETH_P_IP);
-            rah->ar_hln = ETH_ALEN;
-            rah->ar_pln = 4;
-            rah->ar_op = htons(ARPOP_REQUEST);
-
-            /* source hw addr */
-            memcpy(rah->ar_sha, special_ethaddr, ETH_ALEN - 4);
-            memcpy(&rah->ar_sha[2], &slirp->vhost_addr, 4);
-
-            /* source IP */
-            rah->ar_sip = slirp->vhost_addr.s_addr;
-
-            /* target hw addr (none) */
-            memset(rah->ar_tha, 0, ETH_ALEN);
-
-            /* target IP */
-            rah->ar_tip = iph->ip_dst.s_addr;
-            slirp->client_ipaddr = iph->ip_dst;
-            slirp_send_packet_all(slirp, arp_req, sizeof(arp_req));
-            ifm->resolution_requested = true;
-
-            /* Expire request and drop outgoing packet after 1 second */
-            ifm->expiration_date =
-                slirp->cb->clock_get_ns(slirp->opaque) + 1000000000ULL;
-        }
-        return 0;
-    } else {
-        memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 4);
-        /* XXX: not correct */
-        memcpy(&eh->h_source[2], &slirp->vhost_addr, 4);
-        eh->h_proto = htons(ETH_P_IP);
-
-        /* Send this */
-        return 2;
-    }
-}
-
-/* Prepare the IPv6 packet to be sent to the ethernet device. Returns 1 if no
- * packet should be sent, 0 if the packet must be re-queued, 2 if the packet
- * is ready to go.
- */
-static int if_encap6(Slirp *slirp, struct mbuf *ifm, struct ethhdr *eh,
-        uint8_t ethaddr[ETH_ALEN])
-{
-    const struct ip6 *ip6h = mtod(ifm, const struct ip6 *);
-    if (!ndp_table_search(slirp, ip6h->ip_dst, ethaddr)) {
-        if (!ifm->resolution_requested) {
-            ndp_send_ns(slirp, ip6h->ip_dst);
-            ifm->resolution_requested = true;
-            ifm->expiration_date = slirp->cb->clock_get_ns(slirp->opaque) + 1000000000ULL;
-        }
-        return 0;
-    } else {
-        eh->h_proto = htons(ETH_P_IPV6);
-        in6_compute_ethaddr(ip6h->ip_src, eh->h_source);
-
-        /* Send this */
-        return 2;
-    }
-}
-
-/* Output the IP packet to the ethernet device. Returns 0 if the packet must be
- * re-queued.
- */
-int if_encap(Slirp *slirp, struct mbuf *ifm)
-{
-    uint8_t buf[1600];
-    struct ethhdr *eh = (struct ethhdr *)buf;
-    uint8_t ethaddr[ETH_ALEN];
-    const struct ip *iph = (const struct ip *)ifm->m_data;
-    int ret;
-
-    if (ifm->m_len + ETH_HLEN > sizeof(buf)) {
-        return 1;
-    }
-
-    switch (iph->ip_v) {
-    case IPVERSION:
-        ret = if_encap4(slirp, ifm, eh, ethaddr);
-        if (ret < 2) {
-            return ret;
-        }
-        break;
-
-    case IP6VERSION:
-        ret = if_encap6(slirp, ifm, eh, ethaddr);
-        if (ret < 2) {
-            return ret;
-        }
-        break;
-
-    default:
-        g_assert_not_reached();
-        break;
-    }
-
-    memcpy(eh->h_dest, ethaddr, ETH_ALEN);
-    DEBUG_ARG("src = %02x:%02x:%02x:%02x:%02x:%02x",
-              eh->h_source[0], eh->h_source[1], eh->h_source[2],
-              eh->h_source[3], eh->h_source[4], eh->h_source[5]);
-    DEBUG_ARG("dst = %02x:%02x:%02x:%02x:%02x:%02x",
-              eh->h_dest[0], eh->h_dest[1], eh->h_dest[2],
-              eh->h_dest[3], eh->h_dest[4], eh->h_dest[5]);
-    memcpy(buf + sizeof(struct ethhdr), ifm->m_data, ifm->m_len);
-    slirp_send_packet_all(slirp, buf, ifm->m_len + ETH_HLEN);
-    return 1;
-}
-
-/* Drop host forwarding rule, return 0 if found. */
-/* TODO: IPv6 */
-int slirp_remove_hostfwd(Slirp *slirp, int is_udp, struct in_addr host_addr,
-                         int host_port)
-{
-    struct socket *so;
-    struct socket *head = (is_udp ? &slirp->udb : &slirp->tcb);
-    struct sockaddr_in addr;
-    int port = htons(host_port);
-    socklen_t addr_len;
-
-    for (so = head->so_next; so != head; so = so->so_next) {
-        addr_len = sizeof(addr);
-        if ((so->so_state & SS_HOSTFWD) &&
-            getsockname(so->s, (struct sockaddr *)&addr, &addr_len) == 0 &&
-            addr.sin_addr.s_addr == host_addr.s_addr &&
-            addr.sin_port == port) {
-            so->slirp->cb->unregister_poll_fd(so->s, so->slirp->opaque);
-            closesocket(so->s);
-            sofree(so);
-            return 0;
-        }
-    }
-
-    return -1;
-}
-
-/* TODO: IPv6 */
-int slirp_add_hostfwd(Slirp *slirp, int is_udp, struct in_addr host_addr,
-                      int host_port, struct in_addr guest_addr, int guest_port)
-{
-    if (!guest_addr.s_addr) {
-        guest_addr = slirp->vdhcp_startaddr;
-    }
-    if (is_udp) {
-        if (!udp_listen(slirp, host_addr.s_addr, htons(host_port),
-                        guest_addr.s_addr, htons(guest_port), SS_HOSTFWD))
-            return -1;
-    } else {
-        if (!tcp_listen(slirp, host_addr.s_addr, htons(host_port),
-                        guest_addr.s_addr, htons(guest_port), SS_HOSTFWD))
-            return -1;
-    }
-    return 0;
-}
-
-/* TODO: IPv6 */
-static bool
-check_guestfwd(Slirp *slirp, struct in_addr *guest_addr, int guest_port)
-{
-    struct gfwd_list *tmp_ptr;
-
-    if (!guest_addr->s_addr) {
-        guest_addr->s_addr = slirp->vnetwork_addr.s_addr |
-            (htonl(0x0204) & ~slirp->vnetwork_mask.s_addr);
-    }
-    if ((guest_addr->s_addr & slirp->vnetwork_mask.s_addr) !=
-        slirp->vnetwork_addr.s_addr ||
-        guest_addr->s_addr == slirp->vhost_addr.s_addr ||
-        guest_addr->s_addr == slirp->vnameserver_addr.s_addr) {
-        return false;
-    }
-
-    /* check if the port is "bound" */
-    for (tmp_ptr = slirp->guestfwd_list; tmp_ptr; tmp_ptr = tmp_ptr->ex_next) {
-        if (guest_port == tmp_ptr->ex_fport &&
-            guest_addr->s_addr == tmp_ptr->ex_addr.s_addr)
-            return false;
-    }
-
-    return true;
-}
-
-int slirp_add_exec(Slirp *slirp, const char *cmdline,
-                   struct in_addr *guest_addr, int guest_port)
-{
-    if (!check_guestfwd(slirp, guest_addr, guest_port)) {
-        return -1;
-    }
-
-    add_exec(&slirp->guestfwd_list, cmdline, *guest_addr, htons(guest_port));
-    return 0;
-}
-
-int slirp_add_guestfwd(Slirp *slirp, SlirpWriteCb write_cb, void *opaque,
-                       struct in_addr *guest_addr, int guest_port)
-{
-    if (!check_guestfwd(slirp, guest_addr, guest_port)) {
-        return -1;
-    }
-
-    add_guestfwd(&slirp->guestfwd_list, write_cb, opaque,
-                 *guest_addr, htons(guest_port));
-    return 0;
-}
-
-ssize_t slirp_send(struct socket *so, const void *buf, size_t len, int flags)
-{
-    if (so->s == -1 && so->guestfwd) {
-        /* XXX this blocks entire thread. Rewrite to use
-         * qemu_chr_fe_write and background I/O callbacks */
-        so->guestfwd->write_cb(buf, len, so->guestfwd->opaque);
-        return len;
-    }
-
-    if (so->s == -1) {
-        /*
-         * This should in theory not happen but it is hard to be
-         * sure because some code paths will end up with so->s == -1
-         * on a failure but don't dispose of the struct socket.
-         * Check specifically, so we don't pass -1 to send().
-         */
-        errno = EBADF;
-        return -1;
-    }
-
-    return send(so->s, buf, len, flags);
-}
-
-struct socket *
-slirp_find_ctl_socket(Slirp *slirp, struct in_addr guest_addr, int guest_port)
-{
-    struct socket *so;
-
-    /* TODO: IPv6 */
-    for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
-        if (so->so_faddr.s_addr == guest_addr.s_addr &&
-            htons(so->so_fport) == guest_port) {
-            return so;
-        }
-    }
-    return NULL;
-}
-
-size_t slirp_socket_can_recv(Slirp *slirp, struct in_addr guest_addr,
-                             int guest_port)
-{
-    struct iovec iov[2];
-    struct socket *so;
-
-    so = slirp_find_ctl_socket(slirp, guest_addr, guest_port);
-
-    if (!so || so->so_state & SS_NOFDREF) {
-        return 0;
-    }
-
-    if (!CONN_CANFRCV(so) || so->so_snd.sb_cc >= (so->so_snd.sb_datalen/2)) {
-        return 0;
-    }
-
-    return sopreprbuf(so, iov, NULL);
-}
-
-void slirp_socket_recv(Slirp *slirp, struct in_addr guest_addr, int guest_port,
-                       const uint8_t *buf, int size)
-{
-    int ret;
-    struct socket *so = slirp_find_ctl_socket(slirp, guest_addr, guest_port);
-
-    if (!so)
-        return;
-
-    ret = soreadbuf(so, (const char *)buf, size);
-
-    if (ret > 0)
-        tcp_output(sototcpcb(so));
-}
-
-void slirp_send_packet_all(Slirp *slirp, const void *buf, size_t len)
-{
-    ssize_t ret = slirp->cb->send_packet(buf, len, slirp->opaque);
-
-    if (ret < 0) {
-        g_critical("Failed to send packet, ret: %ld", (long) ret);
-    } else if (ret < len) {
-        DEBUG_ERROR("send_packet() didn't send all data: %ld < %lu",
-                (long) ret, (unsigned long) len);
-    }
-}
diff --git a/slirp/src/slirp.h b/slirp/src/slirp.h
deleted file mode 100644
index 3958093..0000000
--- a/slirp/src/slirp.h
+++ /dev/null
@@ -1,275 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-#ifndef SLIRP_H
-#define SLIRP_H
-
-#ifdef _WIN32
-
-/* as defined in sdkddkver.h */
-#ifndef _WIN32_WINNT
-#define _WIN32_WINNT 0x0600 /* Vista */
-#endif
-/* reduces the number of implicitly included headers */
-#ifndef WIN32_LEAN_AND_MEAN
-#define WIN32_LEAN_AND_MEAN
-#endif
-
-# include <winsock2.h>
-# include <windows.h>
-# include <ws2tcpip.h>
-# include <sys/timeb.h>
-# include <iphlpapi.h>
-
-#else
-# if !defined(__HAIKU__)
-#  define O_BINARY 0
-# endif
-#endif
-
-#ifndef _WIN32
-#include <sys/uio.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <sys/socket.h>
-#include <sys/ioctl.h>
-#endif
-
-#ifdef __APPLE__
-# include <sys/filio.h>
-#endif
-
-/* Avoid conflicting with the libc insque() and remque(), which
-   have different prototypes. */
-#define insque slirp_insque
-#define remque slirp_remque
-#define quehead slirp_quehead
-
-#include "debug.h"
-#include "util.h"
-#include "qtailq.h"
-
-#include "libslirp.h"
-#include "ip.h"
-#include "ip6.h"
-#include "tcp.h"
-#include "tcp_timer.h"
-#include "tcp_var.h"
-#include "tcpip.h"
-#include "udp.h"
-#include "ip_icmp.h"
-#include "ip6_icmp.h"
-#include "mbuf.h"
-#include "sbuf.h"
-#include "socket.h"
-#include "if.h"
-#include "main.h"
-#include "misc.h"
-
-#include "bootp.h"
-#include "tftp.h"
-
-#define ARPOP_REQUEST 1         /* ARP request */
-#define ARPOP_REPLY   2         /* ARP reply   */
-
-struct ethhdr {
-    unsigned char  h_dest[ETH_ALEN];   /* destination eth addr */
-    unsigned char  h_source[ETH_ALEN]; /* source ether addr    */
-    unsigned short h_proto;            /* packet type ID field */
-};
-
-struct slirp_arphdr {
-    unsigned short ar_hrd;      /* format of hardware address */
-    unsigned short ar_pro;      /* format of protocol address */
-    unsigned char  ar_hln;      /* length of hardware address */
-    unsigned char  ar_pln;      /* length of protocol address */
-    unsigned short ar_op;       /* ARP opcode (command)       */
-
-    /*
-     *  Ethernet looks like this : This bit is variable sized however...
-     */
-    unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
-    uint32_t      ar_sip;           /* sender IP address       */
-    unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
-    uint32_t      ar_tip;           /* target IP address       */
-} SLIRP_PACKED;
-
-#define ARP_TABLE_SIZE 16
-
-typedef struct ArpTable {
-    struct slirp_arphdr table[ARP_TABLE_SIZE];
-    int next_victim;
-} ArpTable;
-
-void arp_table_add(Slirp *slirp, uint32_t ip_addr, uint8_t ethaddr[ETH_ALEN]);
-
-bool arp_table_search(Slirp *slirp, uint32_t ip_addr,
-                      uint8_t out_ethaddr[ETH_ALEN]);
-
-struct ndpentry {
-    unsigned char   eth_addr[ETH_ALEN];     /* sender hardware address */
-    struct in6_addr ip_addr;                /* sender IP address       */
-};
-
-#define NDP_TABLE_SIZE 16
-
-typedef struct NdpTable {
-    struct ndpentry table[NDP_TABLE_SIZE];
-    int next_victim;
-} NdpTable;
-
-void ndp_table_add(Slirp *slirp, struct in6_addr ip_addr,
-                   uint8_t ethaddr[ETH_ALEN]);
-bool ndp_table_search(Slirp *slirp, struct in6_addr ip_addr,
-                      uint8_t out_ethaddr[ETH_ALEN]);
-
-struct Slirp {
-    QTAILQ_ENTRY(Slirp) entry;
-    unsigned time_fasttimo;
-    unsigned last_slowtimo;
-    bool do_slowtimo;
-
-    bool in_enabled, in6_enabled;
-
-    /* virtual network configuration */
-    struct in_addr vnetwork_addr;
-    struct in_addr vnetwork_mask;
-    struct in_addr vhost_addr;
-    struct in6_addr vprefix_addr6;
-    uint8_t vprefix_len;
-    struct in6_addr vhost_addr6;
-    struct in_addr vdhcp_startaddr;
-    struct in_addr vnameserver_addr;
-    struct in6_addr vnameserver_addr6;
-
-    struct in_addr client_ipaddr;
-    char client_hostname[33];
-
-    int restricted;
-    struct gfwd_list *guestfwd_list;
-
-    /* mbuf states */
-    struct quehead m_freelist;
-    struct quehead m_usedlist;
-    int mbuf_alloced;
-
-    /* if states */
-    struct quehead if_fastq;   /* fast queue (for interactive data) */
-    struct quehead if_batchq;  /* queue for non-interactive data */
-    bool if_start_busy;     /* avoid if_start recursion */
-
-    /* ip states */
-    struct ipq ipq;         /* ip reass. queue */
-    uint16_t ip_id;         /* ip packet ctr, for ids */
-
-    /* bootp/dhcp states */
-    BOOTPClient bootp_clients[NB_BOOTP_CLIENTS];
-    char *bootp_filename;
-    size_t vdnssearch_len;
-    uint8_t *vdnssearch;
-    char *vdomainname;
-
-    /* tcp states */
-    struct socket tcb;
-    struct socket *tcp_last_so;
-    tcp_seq tcp_iss;        /* tcp initial send seq # */
-    uint32_t tcp_now;       /* for RFC 1323 timestamps */
-
-    /* udp states */
-    struct socket udb;
-    struct socket *udp_last_so;
-
-    /* icmp states */
-    struct socket icmp;
-    struct socket *icmp_last_so;
-
-    /* tftp states */
-    char *tftp_prefix;
-    struct tftp_session tftp_sessions[TFTP_SESSIONS_MAX];
-    char *tftp_server_name;
-
-    ArpTable arp_table;
-    NdpTable ndp_table;
-
-    GRand *grand;
-    void *ra_timer;
-
-    const SlirpCb *cb;
-    void *opaque;
-};
-
-void if_start(Slirp *);
-
-int get_dns_addr(struct in_addr *pdns_addr);
-int get_dns6_addr(struct in6_addr *pdns6_addr, uint32_t *scope_id);
-
-/* ncsi.c */
-void ncsi_input(Slirp *slirp, const uint8_t *pkt, int pkt_len);
-
-#ifndef _WIN32
-#include <netdb.h>
-#endif
-
-
-extern bool slirp_do_keepalive;
-
-#define TCP_MAXIDLE (TCPTV_KEEPCNT * TCPTV_KEEPINTVL)
-
-/* dnssearch.c */
-int translate_dnssearch(Slirp *s, const char ** names);
-
-/* cksum.c */
-int cksum(struct mbuf *m, int len);
-int ip6_cksum(struct mbuf *m);
-
-/* if.c */
-void if_init(Slirp *);
-void if_output(struct socket *, struct mbuf *);
-
-/* ip_input.c */
-void ip_init(Slirp *);
-void ip_cleanup(Slirp *);
-void ip_input(struct mbuf *);
-void ip_slowtimo(Slirp *);
-void ip_stripoptions(register struct mbuf *, struct mbuf *);
-
-/* ip_output.c */
-int ip_output(struct socket *, struct mbuf *);
-
-/* ip6_input.c */
-void ip6_init(Slirp *);
-void ip6_cleanup(Slirp *);
-void ip6_input(struct mbuf *);
-
-/* ip6_output */
-int ip6_output(struct socket *, struct mbuf *, int fast);
-
-/* tcp_input.c */
-void tcp_input(register struct mbuf *, int, struct socket *, unsigned short af);
-int tcp_mss(register struct tcpcb *, unsigned);
-
-/* tcp_output.c */
-int tcp_output(register struct tcpcb *);
-void tcp_setpersist(register struct tcpcb *);
-
-/* tcp_subr.c */
-void tcp_init(Slirp *);
-void tcp_cleanup(Slirp *);
-void tcp_template(struct tcpcb *);
-void tcp_respond(struct tcpcb *, register struct tcpiphdr *,
-        register struct mbuf *, tcp_seq, tcp_seq, int, unsigned short);
-struct tcpcb * tcp_newtcpcb(struct socket *);
-struct tcpcb * tcp_close(register struct tcpcb *);
-void tcp_sockclosed(struct tcpcb *);
-int tcp_fconnect(struct socket *, unsigned short af);
-void tcp_connect(struct socket *);
-int tcp_attach(struct socket *);
-uint8_t tcp_tos(struct socket *);
-int tcp_emu(struct socket *, struct mbuf *);
-int tcp_ctl(struct socket *);
-struct tcpcb *tcp_drop(struct tcpcb *tp, int err);
-
-struct socket *
-slirp_find_ctl_socket(Slirp *slirp, struct in_addr guest_addr, int guest_port);
-
-void slirp_send_packet_all(Slirp *slirp, const void *buf, size_t len);
-
-#endif
diff --git a/slirp/src/socket.c b/slirp/src/socket.c
deleted file mode 100644
index bb752fd..0000000
--- a/slirp/src/socket.c
+++ /dev/null
@@ -1,945 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1995 Danny Gasparovski.
- */
-
-#include "slirp.h"
-#include "ip_icmp.h"
-#ifdef __sun__
-#include <sys/filio.h>
-#endif
-
-static void sofcantrcvmore(struct socket *so);
-static void sofcantsendmore(struct socket *so);
-
-struct socket *solookup(struct socket **last, struct socket *head,
-        struct sockaddr_storage *lhost, struct sockaddr_storage *fhost)
-{
-    struct socket *so = *last;
-
-    /* Optimisation */
-    if (so != head && sockaddr_equal(&(so->lhost.ss), lhost)
-            && (!fhost || sockaddr_equal(&so->fhost.ss, fhost))) {
-        return so;
-    }
-
-    for (so = head->so_next; so != head; so = so->so_next) {
-        if (sockaddr_equal(&(so->lhost.ss), lhost)
-                && (!fhost || sockaddr_equal(&so->fhost.ss, fhost))) {
-            *last = so;
-            return so;
-        }
-    }
-
-    return (struct socket *)NULL;
-}
-
-/*
- * Create a new socket, initialise the fields
- * It is the responsibility of the caller to
- * insque() it into the correct linked-list
- */
-struct socket *
-socreate(Slirp *slirp)
-{
-    struct socket *so = g_new(struct socket, 1);
-
-    memset(so, 0, sizeof(struct socket));
-    so->so_state = SS_NOFDREF;
-    so->s = -1;
-    so->slirp = slirp;
-    so->pollfds_idx = -1;
-
-    return so;
-}
-
-/*
- * Remove references to so from the given message queue.
- */
-static void
-soqfree(struct socket *so, struct quehead *qh)
-{
-    struct mbuf *ifq;
-
-    for (ifq = (struct mbuf *) qh->qh_link;
-             (struct quehead *) ifq != qh;
-             ifq = ifq->ifq_next) {
-        if (ifq->ifq_so == so) {
-            struct mbuf *ifm;
-            ifq->ifq_so = NULL;
-            for (ifm = ifq->ifs_next; ifm != ifq; ifm = ifm->ifs_next) {
-                ifm->ifq_so = NULL;
-            }
-        }
-    }
-}
-
-/*
- * remque and free a socket, clobber cache
- */
-void
-sofree(struct socket *so)
-{
-  Slirp *slirp = so->slirp;
-
-  soqfree(so, &slirp->if_fastq);
-  soqfree(so, &slirp->if_batchq);
-
-  if (so == slirp->tcp_last_so) {
-      slirp->tcp_last_so = &slirp->tcb;
-  } else if (so == slirp->udp_last_so) {
-      slirp->udp_last_so = &slirp->udb;
-  } else if (so == slirp->icmp_last_so) {
-      slirp->icmp_last_so = &slirp->icmp;
-  }
-  m_free(so->so_m);
-
-  if(so->so_next && so->so_prev)
-    remque(so);  /* crashes if so is not in a queue */
-
-  if (so->so_tcpcb) {
-      free(so->so_tcpcb);
-  }
-  g_free(so);
-}
-
-size_t sopreprbuf(struct socket *so, struct iovec *iov, int *np)
-{
-	int n, lss, total;
-	struct sbuf *sb = &so->so_snd;
-	int len = sb->sb_datalen - sb->sb_cc;
-	int mss = so->so_tcpcb->t_maxseg;
-
-	DEBUG_CALL("sopreprbuf");
-	DEBUG_ARG("so = %p", so);
-
-	if (len <= 0)
-		return 0;
-
-	iov[0].iov_base = sb->sb_wptr;
-        iov[1].iov_base = NULL;
-        iov[1].iov_len = 0;
-	if (sb->sb_wptr < sb->sb_rptr) {
-		iov[0].iov_len = sb->sb_rptr - sb->sb_wptr;
-		/* Should never succeed, but... */
-		if (iov[0].iov_len > len)
-		   iov[0].iov_len = len;
-		if (iov[0].iov_len > mss)
-		   iov[0].iov_len -= iov[0].iov_len%mss;
-		n = 1;
-	} else {
-		iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_wptr;
-		/* Should never succeed, but... */
-		if (iov[0].iov_len > len) iov[0].iov_len = len;
-		len -= iov[0].iov_len;
-		if (len) {
-			iov[1].iov_base = sb->sb_data;
-			iov[1].iov_len = sb->sb_rptr - sb->sb_data;
-			if(iov[1].iov_len > len)
-			   iov[1].iov_len = len;
-			total = iov[0].iov_len + iov[1].iov_len;
-			if (total > mss) {
-				lss = total%mss;
-				if (iov[1].iov_len > lss) {
-					iov[1].iov_len -= lss;
-					n = 2;
-				} else {
-					lss -= iov[1].iov_len;
-					iov[0].iov_len -= lss;
-					n = 1;
-				}
-			} else
-				n = 2;
-		} else {
-			if (iov[0].iov_len > mss)
-			   iov[0].iov_len -= iov[0].iov_len%mss;
-			n = 1;
-		}
-	}
-	if (np)
-		*np = n;
-
-	return iov[0].iov_len + (n - 1) * iov[1].iov_len;
-}
-
-/*
- * Read from so's socket into sb_snd, updating all relevant sbuf fields
- * NOTE: This will only be called if it is select()ed for reading, so
- * a read() of 0 (or less) means it's disconnected
- */
-int
-soread(struct socket *so)
-{
-	int n, nn;
-	size_t buf_len;
-	struct sbuf *sb = &so->so_snd;
-	struct iovec iov[2];
-
-	DEBUG_CALL("soread");
-	DEBUG_ARG("so = %p", so);
-
-	/*
-	 * No need to check if there's enough room to read.
-	 * soread wouldn't have been called if there weren't
-	 */
-	buf_len = sopreprbuf(so, iov, &n);
-	assert(buf_len != 0);
-
-	nn = recv(so->s, iov[0].iov_base, iov[0].iov_len,0);
-	if (nn <= 0) {
-		if (nn < 0 && (errno == EINTR || errno == EAGAIN))
-			return 0;
-		else {
-			int err;
-			socklen_t elen = sizeof err;
-			struct sockaddr_storage addr;
-			struct sockaddr *paddr = (struct sockaddr *) &addr;
-			socklen_t alen = sizeof addr;
-
-			err = errno;
-			if (nn == 0) {
-				if (getpeername(so->s, paddr, &alen) < 0) {
-					err = errno;
-				} else {
-					getsockopt(so->s, SOL_SOCKET, SO_ERROR,
-						&err, &elen);
-				}
-			}
-
-			DEBUG_MISC(" --- soread() disconnected, nn = %d, errno = %d-%s",
-                       nn, errno,strerror(errno));
-			sofcantrcvmore(so);
-
-			if (err == ECONNRESET || err == ECONNREFUSED
-			    || err == ENOTCONN || err == EPIPE) {
-				tcp_drop(sototcpcb(so), err);
-			} else {
-				tcp_sockclosed(sototcpcb(so));
-			}
-			return -1;
-		}
-	}
-
-	/*
-	 * If there was no error, try and read the second time round
-	 * We read again if n = 2 (ie, there's another part of the buffer)
-	 * and we read as much as we could in the first read
-	 * We don't test for <= 0 this time, because there legitimately
-	 * might not be any more data (since the socket is non-blocking),
-	 * a close will be detected on next iteration.
-	 * A return of -1 won't (shouldn't) happen, since it didn't happen above
-	 */
-	if (n == 2 && nn == iov[0].iov_len) {
-            int ret;
-            ret = recv(so->s, iov[1].iov_base, iov[1].iov_len,0);
-            if (ret > 0)
-                nn += ret;
-        }
-
-	DEBUG_MISC(" ... read nn = %d bytes", nn);
-
-	/* Update fields */
-	sb->sb_cc += nn;
-	sb->sb_wptr += nn;
-	if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen))
-		sb->sb_wptr -= sb->sb_datalen;
-	return nn;
-}
-
-int soreadbuf(struct socket *so, const char *buf, int size)
-{
-    int n, nn, copy = size;
-	struct sbuf *sb = &so->so_snd;
-	struct iovec iov[2];
-
-	DEBUG_CALL("soreadbuf");
-	DEBUG_ARG("so = %p", so);
-
-	/*
-	 * No need to check if there's enough room to read.
-	 * soread wouldn't have been called if there weren't
-	 */
-	assert(size > 0);
-	if (sopreprbuf(so, iov, &n) < size)
-        goto err;
-
-    nn = MIN(iov[0].iov_len, copy);
-    memcpy(iov[0].iov_base, buf, nn);
-
-    copy -= nn;
-    buf += nn;
-
-    if (copy == 0)
-        goto done;
-
-    memcpy(iov[1].iov_base, buf, copy);
-
-done:
-    /* Update fields */
-	sb->sb_cc += size;
-	sb->sb_wptr += size;
-	if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen))
-		sb->sb_wptr -= sb->sb_datalen;
-    return size;
-err:
-
-    sofcantrcvmore(so);
-    tcp_sockclosed(sototcpcb(so));
-    g_critical("soreadbuf buffer too small");
-    return -1;
-}
-
-/*
- * Get urgent data
- *
- * When the socket is created, we set it SO_OOBINLINE,
- * so when OOB data arrives, we soread() it and everything
- * in the send buffer is sent as urgent data
- */
-int
-sorecvoob(struct socket *so)
-{
-	struct tcpcb *tp = sototcpcb(so);
-	int ret;
-
-	DEBUG_CALL("sorecvoob");
-	DEBUG_ARG("so = %p", so);
-
-	/*
-	 * We take a guess at how much urgent data has arrived.
-	 * In most situations, when urgent data arrives, the next
-	 * read() should get all the urgent data.  This guess will
-	 * be wrong however if more data arrives just after the
-	 * urgent data, or the read() doesn't return all the
-	 * urgent data.
-	 */
-	ret = soread(so);
-	if (ret > 0) {
-	    tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
-	    tp->t_force = 1;
-	    tcp_output(tp);
-	    tp->t_force = 0;
-	}
-
-	return ret;
-}
-
-/*
- * Send urgent data
- * There's a lot duplicated code here, but...
- */
-int
-sosendoob(struct socket *so)
-{
-	struct sbuf *sb = &so->so_rcv;
-	char buff[2048]; /* XXX Shouldn't be sending more oob data than this */
-
-	int n;
-
-	DEBUG_CALL("sosendoob");
-	DEBUG_ARG("so = %p", so);
-	DEBUG_ARG("sb->sb_cc = %d", sb->sb_cc);
-
-	if (so->so_urgc > 2048)
-	   so->so_urgc = 2048; /* XXXX */
-
-	if (sb->sb_rptr < sb->sb_wptr) {
-		/* We can send it directly */
-		n = slirp_send(so, sb->sb_rptr, so->so_urgc, (MSG_OOB)); /* |MSG_DONTWAIT)); */
-	} else {
-		/*
-		 * Since there's no sendv or sendtov like writev,
-		 * we must copy all data to a linear buffer then
-		 * send it all
-		 */
-		uint32_t urgc = so->so_urgc;
-		int len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
-		if (len > urgc) {
-			len = urgc;
-		}
-		memcpy(buff, sb->sb_rptr, len);
-		urgc -= len;
-		if (urgc) {
-			n = sb->sb_wptr - sb->sb_data;
-			if (n > urgc) {
-				n = urgc;
-			}
-			memcpy((buff + len), sb->sb_data, n);
-			len += n;
-		}
-		n = slirp_send(so, buff, len, (MSG_OOB)); /* |MSG_DONTWAIT)); */
-#ifdef DEBUG
-		if (n != len) {
-			DEBUG_ERROR("Didn't send all data urgently XXXXX");
-		}
-#endif
-	}
-
-	if (n < 0) {
-		return n;
-	}
-	so->so_urgc -= n;
-	DEBUG_MISC(" ---2 sent %d bytes urgent data, %d urgent bytes left", n, so->so_urgc);
-
-	sb->sb_cc -= n;
-	sb->sb_rptr += n;
-	if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
-		sb->sb_rptr -= sb->sb_datalen;
-
-	return n;
-}
-
-/*
- * Write data from so_rcv to so's socket,
- * updating all sbuf field as necessary
- */
-int
-sowrite(struct socket *so)
-{
-	int  n,nn;
-	struct sbuf *sb = &so->so_rcv;
-	int len = sb->sb_cc;
-	struct iovec iov[2];
-
-	DEBUG_CALL("sowrite");
-	DEBUG_ARG("so = %p", so);
-
-	if (so->so_urgc) {
-		uint32_t expected = so->so_urgc;
-		if (sosendoob(so) < expected) {
-			/* Treat a short write as a fatal error too,
-			 * rather than continuing on and sending the urgent
-			 * data as if it were non-urgent and leaving the
-			 * so_urgc count wrong.
-			 */
-			goto err_disconnected;
-		}
-		if (sb->sb_cc == 0)
-			return 0;
-	}
-
-	/*
-	 * No need to check if there's something to write,
-	 * sowrite wouldn't have been called otherwise
-	 */
-
-	iov[0].iov_base = sb->sb_rptr;
-        iov[1].iov_base = NULL;
-        iov[1].iov_len = 0;
-	if (sb->sb_rptr < sb->sb_wptr) {
-		iov[0].iov_len = sb->sb_wptr - sb->sb_rptr;
-		/* Should never succeed, but... */
-		if (iov[0].iov_len > len) iov[0].iov_len = len;
-		n = 1;
-	} else {
-		iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
-		if (iov[0].iov_len > len) iov[0].iov_len = len;
-		len -= iov[0].iov_len;
-		if (len) {
-			iov[1].iov_base = sb->sb_data;
-			iov[1].iov_len = sb->sb_wptr - sb->sb_data;
-			if (iov[1].iov_len > len) iov[1].iov_len = len;
-			n = 2;
-		} else
-			n = 1;
-	}
-	/* Check if there's urgent data to send, and if so, send it */
-
-	nn = slirp_send(so, iov[0].iov_base, iov[0].iov_len,0);
-	/* This should never happen, but people tell me it does *shrug* */
-	if (nn < 0 && (errno == EAGAIN || errno == EINTR))
-		return 0;
-
-	if (nn <= 0) {
-		goto err_disconnected;
-	}
-
-	if (n == 2 && nn == iov[0].iov_len) {
-            int ret;
-            ret = slirp_send(so, iov[1].iov_base, iov[1].iov_len,0);
-            if (ret > 0)
-                nn += ret;
-        }
-        DEBUG_MISC("  ... wrote nn = %d bytes", nn);
-
-	/* Update sbuf */
-	sb->sb_cc -= nn;
-	sb->sb_rptr += nn;
-	if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
-		sb->sb_rptr -= sb->sb_datalen;
-
-	/*
-	 * If in DRAIN mode, and there's no more data, set
-	 * it CANTSENDMORE
-	 */
-	if ((so->so_state & SS_FWDRAIN) && sb->sb_cc == 0)
-		sofcantsendmore(so);
-
-	return nn;
-
-err_disconnected:
-	DEBUG_MISC(" --- sowrite disconnected, so->so_state = %x, errno = %d",
-               so->so_state, errno);
-	sofcantsendmore(so);
-	tcp_sockclosed(sototcpcb(so));
-	return -1;
-}
-
-/*
- * recvfrom() a UDP socket
- */
-void
-sorecvfrom(struct socket *so)
-{
-	struct sockaddr_storage addr;
-	struct sockaddr_storage saddr, daddr;
-	socklen_t addrlen = sizeof(struct sockaddr_storage);
-
-	DEBUG_CALL("sorecvfrom");
-	DEBUG_ARG("so = %p", so);
-
-	if (so->so_type == IPPROTO_ICMP) {   /* This is a "ping" reply */
-	  char buff[256];
-	  int len;
-
-	  len = recvfrom(so->s, buff, 256, 0,
-			 (struct sockaddr *)&addr, &addrlen);
-	  /* XXX Check if reply is "correct"? */
-
-	  if(len == -1 || len == 0) {
-	    uint8_t code=ICMP_UNREACH_PORT;
-
-	    if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
-	    else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
-
-	    DEBUG_MISC(" udp icmp rx errno = %d-%s",
-                   errno,strerror(errno));
-	    icmp_send_error(so->so_m, ICMP_UNREACH, code, 0, strerror(errno));
-	  } else {
-	    icmp_reflect(so->so_m);
-            so->so_m = NULL; /* Don't m_free() it again! */
-	  }
-	  /* No need for this socket anymore, udp_detach it */
-	  udp_detach(so);
-	} else {                            	/* A "normal" UDP packet */
-	  struct mbuf *m;
-          int len;
-#ifdef _WIN32
-          unsigned long n;
-#else
-          int n;
-#endif
-
-	  if (ioctlsocket(so->s, FIONREAD, &n) != 0) {
-	      DEBUG_MISC(" ioctlsocket errno = %d-%s\n",
-			 errno,strerror(errno));
-	      return;
-	  }
-	  if (n == 0) {
-	      return;
-	  }
-
-	  m = m_get(so->slirp);
-	  if (!m) {
-	      return;
-	  }
-	  switch (so->so_ffamily) {
-	  case AF_INET:
-	      m->m_data += IF_MAXLINKHDR + sizeof(struct udpiphdr);
-	      break;
-	  case AF_INET6:
-	      m->m_data += IF_MAXLINKHDR + sizeof(struct ip6)
-	                                 + sizeof(struct udphdr);
-	      break;
-	  default:
-	      g_assert_not_reached();
-	      break;
-	  }
-
-	  /*
-	   * XXX Shouldn't FIONREAD packets destined for port 53,
-	   * but I don't know the max packet size for DNS lookups
-	   */
-	  len = M_FREEROOM(m);
-	  /* if (so->so_fport != htons(53)) { */
-
-	  if (n > len) {
-	    n = (m->m_data - m->m_dat) + m->m_len + n + 1;
-	    m_inc(m, n);
-	    len = M_FREEROOM(m);
-	  }
-	  /* } */
-
-	  m->m_len = recvfrom(so->s, m->m_data, len, 0,
-			      (struct sockaddr *)&addr, &addrlen);
-	  DEBUG_MISC(" did recvfrom %d, errno = %d-%s",
-                 m->m_len, errno,strerror(errno));
-	  if(m->m_len<0) {
-	    /* Report error as ICMP */
-	    switch (so->so_lfamily) {
-	    uint8_t code;
-	    case AF_INET:
-	      code = ICMP_UNREACH_PORT;
-
-	      if (errno == EHOSTUNREACH) {
-		code = ICMP_UNREACH_HOST;
-	      } else if (errno == ENETUNREACH) {
-		code = ICMP_UNREACH_NET;
-	      }
-
-	      DEBUG_MISC(" rx error, tx icmp ICMP_UNREACH:%i", code);
-	      icmp_send_error(so->so_m, ICMP_UNREACH, code, 0, strerror(errno));
-	      break;
-	    case AF_INET6:
-	      code = ICMP6_UNREACH_PORT;
-
-	      if (errno == EHOSTUNREACH) {
-		code = ICMP6_UNREACH_ADDRESS;
-	      } else if (errno == ENETUNREACH) {
-		code = ICMP6_UNREACH_NO_ROUTE;
-	      }
-
-	      DEBUG_MISC(" rx error, tx icmp6 ICMP_UNREACH:%i", code);
-	      icmp6_send_error(so->so_m, ICMP6_UNREACH, code);
-	      break;
-	    default:
-	      g_assert_not_reached();
-	      break;
-	    }
-	    m_free(m);
-	  } else {
-	  /*
-	   * Hack: domain name lookup will be used the most for UDP,
-	   * and since they'll only be used once there's no need
-	   * for the 4 minute (or whatever) timeout... So we time them
-	   * out much quicker (10 seconds  for now...)
-	   */
-	    if (so->so_expire) {
-	      if (so->so_fport == htons(53))
-		so->so_expire = curtime + SO_EXPIREFAST;
-	      else
-		so->so_expire = curtime + SO_EXPIRE;
-	    }
-
-	    /*
-	     * If this packet was destined for CTL_ADDR,
-	     * make it look like that's where it came from
-	     */
-	    saddr = addr;
-	    sotranslate_in(so, &saddr);
-	    daddr = so->lhost.ss;
-
-	    switch (so->so_ffamily) {
-	    case AF_INET:
-	        udp_output(so, m, (struct sockaddr_in *) &saddr,
-	                   (struct sockaddr_in *) &daddr,
-	                   so->so_iptos);
-	        break;
-	    case AF_INET6:
-	        udp6_output(so, m, (struct sockaddr_in6 *) &saddr,
-	                    (struct sockaddr_in6 *) &daddr);
-	        break;
-	    default:
-	        g_assert_not_reached();
-	        break;
-	    }
-	  } /* rx error */
-	} /* if ping packet */
-}
-
-/*
- * sendto() a socket
- */
-int
-sosendto(struct socket *so, struct mbuf *m)
-{
-	int ret;
-	struct sockaddr_storage addr;
-
-	DEBUG_CALL("sosendto");
-	DEBUG_ARG("so = %p", so);
-	DEBUG_ARG("m = %p", m);
-
-	addr = so->fhost.ss;
-	DEBUG_CALL(" sendto()ing)");
-	sotranslate_out(so, &addr);
-
-	/* Don't care what port we get */
-	ret = sendto(so->s, m->m_data, m->m_len, 0,
-		     (struct sockaddr *)&addr, sockaddr_size(&addr));
-	if (ret < 0)
-		return -1;
-
-	/*
-	 * Kill the socket if there's no reply in 4 minutes,
-	 * but only if it's an expirable socket
-	 */
-	if (so->so_expire)
-		so->so_expire = curtime + SO_EXPIRE;
-	so->so_state &= SS_PERSISTENT_MASK;
-	so->so_state |= SS_ISFCONNECTED; /* So that it gets select()ed */
-	return 0;
-}
-
-/*
- * Listen for incoming TCP connections
- */
-struct socket *
-tcp_listen(Slirp *slirp, uint32_t haddr, unsigned hport, uint32_t laddr,
-           unsigned lport, int flags)
-{
-        /* TODO: IPv6 */
-	struct sockaddr_in addr;
-	struct socket *so;
-	int s, opt = 1;
-	socklen_t addrlen = sizeof(addr);
-	memset(&addr, 0, addrlen);
-
-	DEBUG_CALL("tcp_listen");
-	DEBUG_ARG("haddr = %s", inet_ntoa((struct in_addr){.s_addr = haddr}));
-	DEBUG_ARG("hport = %d", ntohs(hport));
-	DEBUG_ARG("laddr = %s", inet_ntoa((struct in_addr){.s_addr = laddr}));
-	DEBUG_ARG("lport = %d", ntohs(lport));
-	DEBUG_ARG("flags = %x", flags);
-
-	so = socreate(slirp);
-
-	/* Don't tcp_attach... we don't need so_snd nor so_rcv */
-	if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL) {
-            g_free(so);
-            return NULL;
-	}
-	insque(so, &slirp->tcb);
-
-	/*
-	 * SS_FACCEPTONCE sockets must time out.
-	 */
-	if (flags & SS_FACCEPTONCE)
-	   so->so_tcpcb->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT*2;
-
-	so->so_state &= SS_PERSISTENT_MASK;
-	so->so_state |= (SS_FACCEPTCONN | flags);
-	so->so_lfamily = AF_INET;
-	so->so_lport = lport; /* Kept in network format */
-	so->so_laddr.s_addr = laddr; /* Ditto */
-
-	addr.sin_family = AF_INET;
-	addr.sin_addr.s_addr = haddr;
-	addr.sin_port = hport;
-
-	if (((s = slirp_socket(AF_INET,SOCK_STREAM,0)) < 0) ||
-	    (slirp_socket_set_fast_reuse(s) < 0) ||
-	    (bind(s,(struct sockaddr *)&addr, sizeof(addr)) < 0) ||
-	    (listen(s,1) < 0)) {
-		int tmperrno = errno; /* Don't clobber the real reason we failed */
-
-                if (s >= 0) {
-                    closesocket(s);
-                }
-		sofree(so);
-		/* Restore the real errno */
-#ifdef _WIN32
-		WSASetLastError(tmperrno);
-#else
-		errno = tmperrno;
-#endif
-		return NULL;
-	}
-	setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int));
-	opt = 1;
-	setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(int));
-
-	getsockname(s,(struct sockaddr *)&addr,&addrlen);
-	so->so_ffamily = AF_INET;
-	so->so_fport = addr.sin_port;
-	if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr)
-	   so->so_faddr = slirp->vhost_addr;
-	else
-	   so->so_faddr = addr.sin_addr;
-
-	so->s = s;
-	return so;
-}
-
-/*
- * Various session state calls
- * XXX Should be #define's
- * The socket state stuff needs work, these often get call 2 or 3
- * times each when only 1 was needed
- */
-void
-soisfconnecting(struct socket *so)
-{
-	so->so_state &= ~(SS_NOFDREF|SS_ISFCONNECTED|SS_FCANTRCVMORE|
-			  SS_FCANTSENDMORE|SS_FWDRAIN);
-	so->so_state |= SS_ISFCONNECTING; /* Clobber other states */
-}
-
-void
-soisfconnected(struct socket *so)
-{
-	so->so_state &= ~(SS_ISFCONNECTING|SS_FWDRAIN|SS_NOFDREF);
-	so->so_state |= SS_ISFCONNECTED; /* Clobber other states */
-}
-
-static void
-sofcantrcvmore(struct socket *so)
-{
-	if ((so->so_state & SS_NOFDREF) == 0) {
-		shutdown(so->s,0);
-	}
-	so->so_state &= ~(SS_ISFCONNECTING);
-	if (so->so_state & SS_FCANTSENDMORE) {
-	   so->so_state &= SS_PERSISTENT_MASK;
-	   so->so_state |= SS_NOFDREF; /* Don't select it */
-	} else {
-	   so->so_state |= SS_FCANTRCVMORE;
-	}
-}
-
-static void
-sofcantsendmore(struct socket *so)
-{
-	if ((so->so_state & SS_NOFDREF) == 0) {
-            shutdown(so->s,1);           /* send FIN to fhost */
-	}
-	so->so_state &= ~(SS_ISFCONNECTING);
-	if (so->so_state & SS_FCANTRCVMORE) {
-	   so->so_state &= SS_PERSISTENT_MASK;
-	   so->so_state |= SS_NOFDREF; /* as above */
-	} else {
-	   so->so_state |= SS_FCANTSENDMORE;
-	}
-}
-
-/*
- * Set write drain mode
- * Set CANTSENDMORE once all data has been write()n
- */
-void
-sofwdrain(struct socket *so)
-{
-	if (so->so_rcv.sb_cc)
-		so->so_state |= SS_FWDRAIN;
-	else
-		sofcantsendmore(so);
-}
-
-/*
- * Translate addr in host addr when it is a virtual address
- */
-void sotranslate_out(struct socket *so, struct sockaddr_storage *addr)
-{
-    Slirp *slirp = so->slirp;
-    struct sockaddr_in *sin = (struct sockaddr_in *)addr;
-    struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
-
-    switch (addr->ss_family) {
-    case AF_INET:
-        if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
-                slirp->vnetwork_addr.s_addr) {
-            /* It's an alias */
-            if (so->so_faddr.s_addr == slirp->vnameserver_addr.s_addr) {
-                if (get_dns_addr(&sin->sin_addr) < 0) {
-                    sin->sin_addr = loopback_addr;
-                }
-            } else {
-                sin->sin_addr = loopback_addr;
-            }
-        }
-
-        DEBUG_MISC(" addr.sin_port=%d, addr.sin_addr.s_addr=%.16s",
-                   ntohs(sin->sin_port), inet_ntoa(sin->sin_addr));
-        break;
-
-    case AF_INET6:
-        if (in6_equal_net(&so->so_faddr6, &slirp->vprefix_addr6,
-                    slirp->vprefix_len)) {
-            if (in6_equal(&so->so_faddr6, &slirp->vnameserver_addr6)) {
-                uint32_t scope_id;
-                if (get_dns6_addr(&sin6->sin6_addr, &scope_id) >= 0) {
-                    sin6->sin6_scope_id = scope_id;
-                } else {
-                    sin6->sin6_addr = in6addr_loopback;
-                }
-            } else {
-                sin6->sin6_addr = in6addr_loopback;
-            }
-        }
-        break;
-
-    default:
-        break;
-    }
-}
-
-void sotranslate_in(struct socket *so, struct sockaddr_storage *addr)
-{
-    Slirp *slirp = so->slirp;
-    struct sockaddr_in *sin = (struct sockaddr_in *)addr;
-    struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
-
-    switch (addr->ss_family) {
-    case AF_INET:
-        if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
-            slirp->vnetwork_addr.s_addr) {
-            uint32_t inv_mask = ~slirp->vnetwork_mask.s_addr;
-
-            if ((so->so_faddr.s_addr & inv_mask) == inv_mask) {
-                sin->sin_addr = slirp->vhost_addr;
-            } else if (sin->sin_addr.s_addr == loopback_addr.s_addr ||
-                       so->so_faddr.s_addr != slirp->vhost_addr.s_addr) {
-                sin->sin_addr = so->so_faddr;
-            }
-        }
-        break;
-
-    case AF_INET6:
-        if (in6_equal_net(&so->so_faddr6, &slirp->vprefix_addr6,
-                    slirp->vprefix_len)) {
-            if (in6_equal(&sin6->sin6_addr, &in6addr_loopback)
-                    || !in6_equal(&so->so_faddr6, &slirp->vhost_addr6)) {
-                sin6->sin6_addr = so->so_faddr6;
-            }
-        }
-        break;
-
-    default:
-        break;
-    }
-}
-
-/*
- * Translate connections from localhost to the real hostname
- */
-void sotranslate_accept(struct socket *so)
-{
-    Slirp *slirp = so->slirp;
-
-    switch (so->so_ffamily) {
-    case AF_INET:
-        if (so->so_faddr.s_addr == INADDR_ANY ||
-            (so->so_faddr.s_addr & loopback_mask) ==
-            (loopback_addr.s_addr & loopback_mask)) {
-           so->so_faddr = slirp->vhost_addr;
-        }
-        break;
-
-   case AF_INET6:
-        if (in6_equal(&so->so_faddr6, &in6addr_any) ||
-                in6_equal(&so->so_faddr6, &in6addr_loopback)) {
-           so->so_faddr6 = slirp->vhost_addr6;
-        }
-        break;
-
-    default:
-        break;
-    }
-}
-
-void sodrop(struct socket *s, int num)
-{
-    if (sbdrop(&s->so_snd, num)) {
-        s->slirp->cb->notify(s->slirp->opaque);
-    }
-}
diff --git a/slirp/src/socket.h b/slirp/src/socket.h
deleted file mode 100644
index 2540389..0000000
--- a/slirp/src/socket.h
+++ /dev/null
@@ -1,160 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1995 Danny Gasparovski.
- */
-
-#ifndef SLIRP_SOCKET_H
-#define SLIRP_SOCKET_H
-
-#include "misc.h"
-
-#define SO_EXPIRE 240000
-#define SO_EXPIREFAST 10000
-
-/*
- * Our socket structure
- */
-
-union slirp_sockaddr {
-    struct sockaddr_storage ss;
-    struct sockaddr_in sin;
-    struct sockaddr_in6 sin6;
-};
-
-struct socket {
-  struct socket *so_next,*so_prev;      /* For a linked list of sockets */
-
-  int s;                           /* The actual socket */
-  struct gfwd_list *guestfwd;
-
-  int pollfds_idx;                 /* GPollFD GArray index */
-
-  Slirp *slirp;			   /* managing slirp instance */
-
-			/* XXX union these with not-yet-used sbuf params */
-  struct mbuf *so_m;	           /* Pointer to the original SYN packet,
-				    * for non-blocking connect()'s, and
-				    * PING reply's */
-  struct tcpiphdr *so_ti;	   /* Pointer to the original ti within
-				    * so_mconn, for non-blocking connections */
-  uint32_t      so_urgc;
-  union slirp_sockaddr fhost;      /* Foreign host */
-#define so_faddr fhost.sin.sin_addr
-#define so_fport fhost.sin.sin_port
-#define so_faddr6 fhost.sin6.sin6_addr
-#define so_fport6 fhost.sin6.sin6_port
-#define so_ffamily fhost.ss.ss_family
-
-  union slirp_sockaddr lhost;      /* Local host */
-#define so_laddr lhost.sin.sin_addr
-#define so_lport lhost.sin.sin_port
-#define so_laddr6 lhost.sin6.sin6_addr
-#define so_lport6 lhost.sin6.sin6_port
-#define so_lfamily lhost.ss.ss_family
-
-  uint8_t	so_iptos;	/* Type of service */
-  uint8_t	so_emu;		/* Is the socket emulated? */
-
-  uint8_t       so_type;        /* Type of socket, UDP or TCP */
-  int32_t       so_state;       /* internal state flags SS_*, below */
-
-  struct 	tcpcb *so_tcpcb;	/* pointer to TCP protocol control block */
-  unsigned	so_expire;		/* When the socket will expire */
-
-  int	so_queued;		/* Number of packets queued from this socket */
-  int	so_nqueued;		/* Number of packets queued in a row
-				 * Used to determine when to "downgrade" a session
-					 * from fastq to batchq */
-
-  struct sbuf so_rcv;		/* Receive buffer */
-  struct sbuf so_snd;		/* Send buffer */
-};
-
-
-/*
- * Socket state bits. (peer means the host on the Internet,
- * local host means the host on the other end of the modem)
- */
-#define SS_NOFDREF		0x001	/* No fd reference */
-
-#define SS_ISFCONNECTING	0x002	/* Socket is connecting to peer (non-blocking connect()'s) */
-#define SS_ISFCONNECTED		0x004	/* Socket is connected to peer */
-#define SS_FCANTRCVMORE		0x008	/* Socket can't receive more from peer (for half-closes) */
-#define SS_FCANTSENDMORE	0x010	/* Socket can't send more to peer (for half-closes) */
-#define SS_FWDRAIN		0x040	/* We received a FIN, drain data and set SS_FCANTSENDMORE */
-
-#define SS_CTL			0x080
-#define SS_FACCEPTCONN		0x100	/* Socket is accepting connections from a host on the internet */
-#define SS_FACCEPTONCE		0x200	/* If set, the SS_FACCEPTCONN socket will die after one accept */
-
-#define SS_PERSISTENT_MASK	0xf000	/* Unremovable state bits */
-#define SS_HOSTFWD		0x1000	/* Socket describes host->guest forwarding */
-#define SS_INCOMING		0x2000	/* Connection was initiated by a host on the internet */
-
-static inline int sockaddr_equal(struct sockaddr_storage *a,
-        struct sockaddr_storage *b)
-{
-    if (a->ss_family != b->ss_family) {
-        return 0;
-    }
-
-    switch (a->ss_family) {
-    case AF_INET:
-    {
-        struct sockaddr_in *a4 = (struct sockaddr_in *) a;
-        struct sockaddr_in *b4 = (struct sockaddr_in *) b;
-        return a4->sin_addr.s_addr == b4->sin_addr.s_addr
-               && a4->sin_port == b4->sin_port;
-    }
-    case AF_INET6:
-    {
-        struct sockaddr_in6 *a6 = (struct sockaddr_in6 *) a;
-        struct sockaddr_in6 *b6 = (struct sockaddr_in6 *) b;
-        return (in6_equal(&a6->sin6_addr, &b6->sin6_addr)
-                && a6->sin6_port == b6->sin6_port);
-    }
-    default:
-        g_assert_not_reached();
-    }
-
-    return 0;
-}
-
-static inline socklen_t sockaddr_size(struct sockaddr_storage *a)
-{
-    switch (a->ss_family) {
-    case AF_INET:
-        return sizeof(struct sockaddr_in);
-    case AF_INET6:
-        return sizeof(struct sockaddr_in6);
-    default:
-        g_assert_not_reached();
-    }
-}
-
-struct socket *solookup(struct socket **, struct socket *,
-        struct sockaddr_storage *, struct sockaddr_storage *);
-struct socket *socreate(Slirp *);
-void sofree(struct socket *);
-int soread(struct socket *);
-int sorecvoob(struct socket *);
-int sosendoob(struct socket *);
-int sowrite(struct socket *);
-void sorecvfrom(struct socket *);
-int sosendto(struct socket *, struct mbuf *);
-struct socket * tcp_listen(Slirp *, uint32_t, unsigned, uint32_t, unsigned,
-                               int);
-void soisfconnecting(register struct socket *);
-void soisfconnected(register struct socket *);
-void sofwdrain(struct socket *);
-struct iovec; /* For win32 */
-size_t sopreprbuf(struct socket *so, struct iovec *iov, int *np);
-int soreadbuf(struct socket *so, const char *buf, int size);
-
-void sotranslate_out(struct socket *, struct sockaddr_storage *);
-void sotranslate_in(struct socket *, struct sockaddr_storage *);
-void sotranslate_accept(struct socket *);
-void sodrop(struct socket *, int num);
-
-
-#endif /* SLIRP_SOCKET_H */
diff --git a/slirp/src/state.c b/slirp/src/state.c
deleted file mode 100644
index 09cea35..0000000
--- a/slirp/src/state.c
+++ /dev/null
@@ -1,388 +0,0 @@
-/* SPDX-License-Identifier: MIT */
-/*
- * libslirp
- *
- * Copyright (c) 2004-2008 Fabrice Bellard
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-#include "slirp.h"
-#include "vmstate.h"
-#include "stream.h"
-
-static int slirp_tcp_post_load(void *opaque, int version)
-{
-    tcp_template((struct tcpcb *)opaque);
-
-    return 0;
-}
-
-static const VMStateDescription vmstate_slirp_tcp = {
-    .name = "slirp-tcp",
-    .version_id = 0,
-    .post_load = slirp_tcp_post_load,
-    .fields = (VMStateField[]) {
-        VMSTATE_INT16(t_state, struct tcpcb),
-        VMSTATE_INT16_ARRAY(t_timer, struct tcpcb, TCPT_NTIMERS),
-        VMSTATE_INT16(t_rxtshift, struct tcpcb),
-        VMSTATE_INT16(t_rxtcur, struct tcpcb),
-        VMSTATE_INT16(t_dupacks, struct tcpcb),
-        VMSTATE_UINT16(t_maxseg, struct tcpcb),
-        VMSTATE_UINT8(t_force, struct tcpcb),
-        VMSTATE_UINT16(t_flags, struct tcpcb),
-        VMSTATE_UINT32(snd_una, struct tcpcb),
-        VMSTATE_UINT32(snd_nxt, struct tcpcb),
-        VMSTATE_UINT32(snd_up, struct tcpcb),
-        VMSTATE_UINT32(snd_wl1, struct tcpcb),
-        VMSTATE_UINT32(snd_wl2, struct tcpcb),
-        VMSTATE_UINT32(iss, struct tcpcb),
-        VMSTATE_UINT32(snd_wnd, struct tcpcb),
-        VMSTATE_UINT32(rcv_wnd, struct tcpcb),
-        VMSTATE_UINT32(rcv_nxt, struct tcpcb),
-        VMSTATE_UINT32(rcv_up, struct tcpcb),
-        VMSTATE_UINT32(irs, struct tcpcb),
-        VMSTATE_UINT32(rcv_adv, struct tcpcb),
-        VMSTATE_UINT32(snd_max, struct tcpcb),
-        VMSTATE_UINT32(snd_cwnd, struct tcpcb),
-        VMSTATE_UINT32(snd_ssthresh, struct tcpcb),
-        VMSTATE_INT16(t_idle, struct tcpcb),
-        VMSTATE_INT16(t_rtt, struct tcpcb),
-        VMSTATE_UINT32(t_rtseq, struct tcpcb),
-        VMSTATE_INT16(t_srtt, struct tcpcb),
-        VMSTATE_INT16(t_rttvar, struct tcpcb),
-        VMSTATE_UINT16(t_rttmin, struct tcpcb),
-        VMSTATE_UINT32(max_sndwnd, struct tcpcb),
-        VMSTATE_UINT8(t_oobflags, struct tcpcb),
-        VMSTATE_UINT8(t_iobc, struct tcpcb),
-        VMSTATE_INT16(t_softerror, struct tcpcb),
-        VMSTATE_UINT8(snd_scale, struct tcpcb),
-        VMSTATE_UINT8(rcv_scale, struct tcpcb),
-        VMSTATE_UINT8(request_r_scale, struct tcpcb),
-        VMSTATE_UINT8(requested_s_scale, struct tcpcb),
-        VMSTATE_UINT32(ts_recent, struct tcpcb),
-        VMSTATE_UINT32(ts_recent_age, struct tcpcb),
-        VMSTATE_UINT32(last_ack_sent, struct tcpcb),
-        VMSTATE_END_OF_LIST()
-    }
-};
-
-/* The sbuf has a pair of pointers that are migrated as offsets;
- * we calculate the offsets and restore the pointers using
- * pre_save/post_load on a tmp structure.
- */
-struct sbuf_tmp {
-    struct sbuf *parent;
-    uint32_t roff, woff;
-};
-
-static int sbuf_tmp_pre_save(void *opaque)
-{
-    struct sbuf_tmp *tmp = opaque;
-    tmp->woff = tmp->parent->sb_wptr - tmp->parent->sb_data;
-    tmp->roff = tmp->parent->sb_rptr - tmp->parent->sb_data;
-
-    return 0;
-}
-
-static int sbuf_tmp_post_load(void *opaque, int version)
-{
-    struct sbuf_tmp *tmp = opaque;
-    uint32_t requested_len = tmp->parent->sb_datalen;
-
-    /* Allocate the buffer space used by the field after the tmp */
-    sbreserve(tmp->parent, tmp->parent->sb_datalen);
-
-    if (tmp->parent->sb_datalen != requested_len) {
-        return -ENOMEM;
-    }
-    if (tmp->woff >= requested_len ||
-        tmp->roff >= requested_len) {
-        g_critical("invalid sbuf offsets r/w=%u/%u len=%u",
-                   tmp->roff, tmp->woff, requested_len);
-        return -EINVAL;
-    }
-
-    tmp->parent->sb_wptr = tmp->parent->sb_data + tmp->woff;
-    tmp->parent->sb_rptr = tmp->parent->sb_data + tmp->roff;
-
-    return 0;
-}
-
-
-static const VMStateDescription vmstate_slirp_sbuf_tmp = {
-    .name = "slirp-sbuf-tmp",
-    .post_load = sbuf_tmp_post_load,
-    .pre_save  = sbuf_tmp_pre_save,
-    .version_id = 0,
-    .fields = (VMStateField[]) {
-        VMSTATE_UINT32(woff, struct sbuf_tmp),
-        VMSTATE_UINT32(roff, struct sbuf_tmp),
-        VMSTATE_END_OF_LIST()
-    }
-};
-
-static const VMStateDescription vmstate_slirp_sbuf = {
-    .name = "slirp-sbuf",
-    .version_id = 0,
-    .fields = (VMStateField[]) {
-        VMSTATE_UINT32(sb_cc, struct sbuf),
-        VMSTATE_UINT32(sb_datalen, struct sbuf),
-        VMSTATE_WITH_TMP(struct sbuf, struct sbuf_tmp, vmstate_slirp_sbuf_tmp),
-        VMSTATE_VBUFFER_UINT32(sb_data, struct sbuf, 0, NULL, sb_datalen),
-        VMSTATE_END_OF_LIST()
-    }
-};
-
-static bool slirp_older_than_v4(void *opaque, int version_id)
-{
-    return version_id < 4;
-}
-
-static bool slirp_family_inet(void *opaque, int version_id)
-{
-    union slirp_sockaddr *ssa = (union slirp_sockaddr *)opaque;
-    return ssa->ss.ss_family == AF_INET;
-}
-
-static int slirp_socket_pre_load(void *opaque)
-{
-    struct socket *so = opaque;
-    if (tcp_attach(so) < 0) {
-        return -ENOMEM;
-    }
-    /* Older versions don't load these fields */
-    so->so_ffamily = AF_INET;
-    so->so_lfamily = AF_INET;
-    return 0;
-}
-
-#ifndef _WIN32
-#define VMSTATE_SIN4_ADDR(f, s, t) VMSTATE_UINT32_TEST(f, s, t)
-#else
-/* Win uses u_long rather than uint32_t - but it's still 32bits long */
-#define VMSTATE_SIN4_ADDR(f, s, t) VMSTATE_SINGLE_TEST(f, s, t, 0, \
-                                       slirp_vmstate_info_uint32, u_long)
-#endif
-
-/* The OS provided ss_family field isn't that portable; it's size
- * and type varies (16/8 bit, signed, unsigned)
- * and the values it contains aren't fully portable.
- */
-typedef struct SS_FamilyTmpStruct {
-    union slirp_sockaddr    *parent;
-    uint16_t                 portable_family;
-} SS_FamilyTmpStruct;
-
-#define SS_FAMILY_MIG_IPV4   2  /* Linux, BSD, Win... */
-#define SS_FAMILY_MIG_IPV6  10  /* Linux */
-#define SS_FAMILY_MIG_OTHER 0xffff
-
-static int ss_family_pre_save(void *opaque)
-{
-    SS_FamilyTmpStruct *tss = opaque;
-
-    tss->portable_family = SS_FAMILY_MIG_OTHER;
-
-    if (tss->parent->ss.ss_family == AF_INET) {
-        tss->portable_family = SS_FAMILY_MIG_IPV4;
-    } else if (tss->parent->ss.ss_family == AF_INET6) {
-        tss->portable_family = SS_FAMILY_MIG_IPV6;
-    }
-
-    return 0;
-}
-
-static int ss_family_post_load(void *opaque, int version_id)
-{
-    SS_FamilyTmpStruct *tss = opaque;
-
-    switch (tss->portable_family) {
-    case SS_FAMILY_MIG_IPV4:
-        tss->parent->ss.ss_family = AF_INET;
-        break;
-    case SS_FAMILY_MIG_IPV6:
-    case 23: /* compatibility: AF_INET6 from mingw */
-    case 28: /* compatibility: AF_INET6 from FreeBSD sys/socket.h */
-        tss->parent->ss.ss_family = AF_INET6;
-        break;
-    default:
-        g_critical("invalid ss_family type %x", tss->portable_family);
-        return -EINVAL;
-    }
-
-    return 0;
-}
-
-static const VMStateDescription vmstate_slirp_ss_family = {
-    .name = "slirp-socket-addr/ss_family",
-    .pre_save  = ss_family_pre_save,
-    .post_load = ss_family_post_load,
-    .fields = (VMStateField[]) {
-        VMSTATE_UINT16(portable_family, SS_FamilyTmpStruct),
-        VMSTATE_END_OF_LIST()
-    }
-};
-
-static const VMStateDescription vmstate_slirp_socket_addr = {
-    .name = "slirp-socket-addr",
-    .version_id = 4,
-    .fields = (VMStateField[]) {
-        VMSTATE_WITH_TMP(union slirp_sockaddr, SS_FamilyTmpStruct,
-                            vmstate_slirp_ss_family),
-        VMSTATE_SIN4_ADDR(sin.sin_addr.s_addr, union slirp_sockaddr,
-                            slirp_family_inet),
-        VMSTATE_UINT16_TEST(sin.sin_port, union slirp_sockaddr,
-                            slirp_family_inet),
-
-#if 0
-        /* Untested: Needs checking by someone with IPv6 test */
-        VMSTATE_BUFFER_TEST(sin6.sin6_addr, union slirp_sockaddr,
-                            slirp_family_inet6),
-        VMSTATE_UINT16_TEST(sin6.sin6_port, union slirp_sockaddr,
-                            slirp_family_inet6),
-        VMSTATE_UINT32_TEST(sin6.sin6_flowinfo, union slirp_sockaddr,
-                            slirp_family_inet6),
-        VMSTATE_UINT32_TEST(sin6.sin6_scope_id, union slirp_sockaddr,
-                            slirp_family_inet6),
-#endif
-
-        VMSTATE_END_OF_LIST()
-    }
-};
-
-static const VMStateDescription vmstate_slirp_socket = {
-    .name = "slirp-socket",
-    .version_id = 4,
-    .pre_load = slirp_socket_pre_load,
-    .fields = (VMStateField[]) {
-        VMSTATE_UINT32(so_urgc, struct socket),
-        /* Pre-v4 versions */
-        VMSTATE_SIN4_ADDR(so_faddr.s_addr, struct socket,
-                            slirp_older_than_v4),
-        VMSTATE_SIN4_ADDR(so_laddr.s_addr, struct socket,
-                            slirp_older_than_v4),
-        VMSTATE_UINT16_TEST(so_fport, struct socket, slirp_older_than_v4),
-        VMSTATE_UINT16_TEST(so_lport, struct socket, slirp_older_than_v4),
-        /* v4 and newer */
-        VMSTATE_STRUCT(fhost, struct socket, 4, vmstate_slirp_socket_addr,
-                       union slirp_sockaddr),
-        VMSTATE_STRUCT(lhost, struct socket, 4, vmstate_slirp_socket_addr,
-                       union slirp_sockaddr),
-
-        VMSTATE_UINT8(so_iptos, struct socket),
-        VMSTATE_UINT8(so_emu, struct socket),
-        VMSTATE_UINT8(so_type, struct socket),
-        VMSTATE_INT32(so_state, struct socket),
-        VMSTATE_STRUCT(so_rcv, struct socket, 0, vmstate_slirp_sbuf,
-                       struct sbuf),
-        VMSTATE_STRUCT(so_snd, struct socket, 0, vmstate_slirp_sbuf,
-                       struct sbuf),
-        VMSTATE_STRUCT_POINTER(so_tcpcb, struct socket, vmstate_slirp_tcp,
-                       struct tcpcb),
-        VMSTATE_END_OF_LIST()
-    }
-};
-
-static const VMStateDescription vmstate_slirp_bootp_client = {
-    .name = "slirp_bootpclient",
-    .fields = (VMStateField[]) {
-        VMSTATE_UINT16(allocated, BOOTPClient),
-        VMSTATE_BUFFER(macaddr, BOOTPClient),
-        VMSTATE_END_OF_LIST()
-    }
-};
-
-static const VMStateDescription vmstate_slirp = {
-    .name = "slirp",
-    .version_id = 4,
-    .fields = (VMStateField[]) {
-        VMSTATE_UINT16_V(ip_id, Slirp, 2),
-        VMSTATE_STRUCT_ARRAY(bootp_clients, Slirp, NB_BOOTP_CLIENTS, 3,
-                             vmstate_slirp_bootp_client, BOOTPClient),
-        VMSTATE_END_OF_LIST()
-    }
-};
-
-void slirp_state_save(Slirp *slirp, SlirpWriteCb write_cb, void *opaque)
-{
-    struct gfwd_list *ex_ptr;
-    SlirpOStream f = {
-        .write_cb = write_cb,
-        .opaque = opaque,
-    };
-
-    for (ex_ptr = slirp->guestfwd_list; ex_ptr; ex_ptr = ex_ptr->ex_next)
-        if (ex_ptr->write_cb) {
-            struct socket *so;
-            so = slirp_find_ctl_socket(slirp, ex_ptr->ex_addr,
-                                       ntohs(ex_ptr->ex_fport));
-            if (!so) {
-                continue;
-            }
-
-            slirp_ostream_write_u8(&f, 42);
-            slirp_vmstate_save_state(&f, &vmstate_slirp_socket, so);
-        }
-    slirp_ostream_write_u8(&f, 0);
-
-    slirp_vmstate_save_state(&f, &vmstate_slirp, slirp);
-}
-
-
-int slirp_state_load(Slirp *slirp, int version_id,
-                     SlirpReadCb read_cb, void *opaque)
-{
-    struct gfwd_list *ex_ptr;
-    SlirpIStream f = {
-        .read_cb = read_cb,
-        .opaque = opaque,
-    };
-
-    while (slirp_istream_read_u8(&f)) {
-        int ret;
-        struct socket *so = socreate(slirp);
-
-        ret = slirp_vmstate_load_state(&f, &vmstate_slirp_socket, so, version_id);
-        if (ret < 0) {
-            return ret;
-        }
-
-        if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) !=
-            slirp->vnetwork_addr.s_addr) {
-            return -EINVAL;
-        }
-        for (ex_ptr = slirp->guestfwd_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
-            if (ex_ptr->write_cb &&
-                so->so_faddr.s_addr == ex_ptr->ex_addr.s_addr &&
-                so->so_fport == ex_ptr->ex_fport) {
-                break;
-            }
-        }
-        if (!ex_ptr) {
-            return -EINVAL;
-        }
-    }
-
-    return slirp_vmstate_load_state(&f, &vmstate_slirp, slirp, version_id);
-}
-
-int slirp_state_version(void)
-{
-    return 4;
-}
diff --git a/slirp/src/stream.c b/slirp/src/stream.c
deleted file mode 100644
index 9c1764c..0000000
--- a/slirp/src/stream.c
+++ /dev/null
@@ -1,120 +0,0 @@
-/* SPDX-License-Identifier: MIT */
-/*
- * libslirp io streams
- *
- * Copyright (c) 2018 Red Hat, Inc.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-#include "stream.h"
-#include <glib.h>
-
-bool slirp_istream_read(SlirpIStream *f, void *buf, size_t size)
-{
-    return f->read_cb(buf, size, f->opaque) == size;
-}
-
-bool slirp_ostream_write(SlirpOStream *f, const void *buf, size_t size)
-{
-    return f->write_cb(buf, size, f->opaque) == size;
-}
-
-uint8_t slirp_istream_read_u8(SlirpIStream *f)
-{
-    uint8_t b;
-
-    if (slirp_istream_read(f, &b, sizeof(b))) {
-        return b;
-    }
-
-    return 0;
-}
-
-bool slirp_ostream_write_u8(SlirpOStream *f, uint8_t b)
-{
-    return slirp_ostream_write(f, &b, sizeof(b));
-}
-
-uint16_t slirp_istream_read_u16(SlirpIStream *f)
-{
-    uint16_t b;
-
-    if (slirp_istream_read(f, &b, sizeof(b))) {
-        return GUINT16_FROM_BE(b);
-    }
-
-    return 0;
-}
-
-bool slirp_ostream_write_u16(SlirpOStream *f, uint16_t b)
-{
-    b =  GUINT16_TO_BE(b);
-    return slirp_ostream_write(f, &b, sizeof(b));
-}
-
-uint32_t slirp_istream_read_u32(SlirpIStream *f)
-{
-    uint32_t b;
-
-    if (slirp_istream_read(f, &b, sizeof(b))) {
-        return GUINT32_FROM_BE(b);
-    }
-
-    return 0;
-}
-
-bool slirp_ostream_write_u32(SlirpOStream *f, uint32_t b)
-{
-    b = GUINT32_TO_BE(b);
-    return slirp_ostream_write(f, &b, sizeof(b));
-}
-
-int16_t slirp_istream_read_i16(SlirpIStream *f)
-{
-    int16_t b;
-
-    if (slirp_istream_read(f, &b, sizeof(b))) {
-        return GINT16_FROM_BE(b);
-    }
-
-    return 0;
-}
-
-bool slirp_ostream_write_i16(SlirpOStream *f, int16_t b)
-{
-    b = GINT16_TO_BE(b);
-    return slirp_ostream_write(f, &b, sizeof(b));
-}
-
-int32_t slirp_istream_read_i32(SlirpIStream *f)
-{
-    int32_t b;
-
-    if (slirp_istream_read(f, &b, sizeof(b))) {
-        return GINT32_FROM_BE(b);
-    }
-
-    return 0;
-}
-
-bool slirp_ostream_write_i32(SlirpOStream *f, int32_t b)
-{
-    b = GINT32_TO_BE(b);
-    return slirp_ostream_write(f, &b, sizeof(b));
-}
diff --git a/slirp/src/stream.h b/slirp/src/stream.h
deleted file mode 100644
index 08bb5b6..0000000
--- a/slirp/src/stream.h
+++ /dev/null
@@ -1,35 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-#ifndef STREAM_H_
-#define STREAM_H_
-
-#include "libslirp.h"
-
-typedef struct SlirpIStream {
-    SlirpReadCb read_cb;
-    void *opaque;
-} SlirpIStream;
-
-typedef struct SlirpOStream {
-    SlirpWriteCb write_cb;
-    void *opaque;
-} SlirpOStream;
-
-bool slirp_istream_read(SlirpIStream *f, void *buf, size_t size);
-bool slirp_ostream_write(SlirpOStream *f, const void *buf, size_t size);
-
-uint8_t slirp_istream_read_u8(SlirpIStream *f);
-bool slirp_ostream_write_u8(SlirpOStream *f, uint8_t b);
-
-uint16_t slirp_istream_read_u16(SlirpIStream *f);
-bool slirp_ostream_write_u16(SlirpOStream *f, uint16_t b);
-
-uint32_t slirp_istream_read_u32(SlirpIStream *f);
-bool slirp_ostream_write_u32(SlirpOStream *f, uint32_t b);
-
-int16_t slirp_istream_read_i16(SlirpIStream *f);
-bool slirp_ostream_write_i16(SlirpOStream *f, int16_t b);
-
-int32_t slirp_istream_read_i32(SlirpIStream *f);
-bool slirp_ostream_write_i32(SlirpOStream *f, int32_t b);
-
-#endif /* STREAM_H_ */
diff --git a/slirp/src/tcp.h b/slirp/src/tcp.h
deleted file mode 100644
index 79d3251..0000000
--- a/slirp/src/tcp.h
+++ /dev/null
@@ -1,181 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1982, 1986, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)tcp.h	8.1 (Berkeley) 6/10/93
- * tcp.h,v 1.3 1994/08/21 05:27:34 paul Exp
- */
-
-#ifndef TCP_H
-#define TCP_H
-
-#include <glib.h>
-
-typedef	uint32_t tcp_seq;
-
-#define      PR_SLOWHZ       2               /* 2 slow timeouts per second (approx) */
-#define      PR_FASTHZ       5               /* 5 fast timeouts per second (not important) */
-
-#define TCP_SNDSPACE 8192
-#define TCP_RCVSPACE 8192
-
-/*
- * TCP header.
- * Per RFC 793, September, 1981.
- */
-#define tcphdr slirp_tcphdr
-struct tcphdr {
-	uint16_t th_sport;              /* source port */
-	uint16_t th_dport;              /* destination port */
-	tcp_seq	th_seq;			/* sequence number */
-	tcp_seq	th_ack;			/* acknowledgement number */
-#if G_BYTE_ORDER == G_BIG_ENDIAN
-	uint8_t	th_off:4,		/* data offset */
-		th_x2:4;		/* (unused) */
-#else
-	uint8_t	th_x2:4,		/* (unused) */
-		th_off:4;		/* data offset */
-#endif
-	uint8_t th_flags;
-	uint16_t th_win;                /* window */
-	uint16_t th_sum;                /* checksum */
-	uint16_t th_urp;                /* urgent pointer */
-};
-
-#include "tcp_var.h"
-
-#ifndef TH_FIN
-#define	TH_FIN	0x01
-#define	TH_SYN	0x02
-#define	TH_RST	0x04
-#define	TH_PUSH	0x08
-#define	TH_ACK	0x10
-#define	TH_URG	0x20
-#endif
-
-#ifndef TCPOPT_EOL
-#define	TCPOPT_EOL		0
-#define	TCPOPT_NOP		1
-#define	TCPOPT_MAXSEG		2
-#define TCPOPT_WINDOW		3
-#define TCPOPT_SACK_PERMITTED	4		/* Experimental */
-#define TCPOPT_SACK		5		/* Experimental */
-#define TCPOPT_TIMESTAMP	8
-
-#define TCPOPT_TSTAMP_HDR	\
-    (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
-#endif
-
-#ifndef TCPOLEN_MAXSEG
-#define    TCPOLEN_MAXSEG		4
-#define    TCPOLEN_WINDOW		3
-#define    TCPOLEN_SACK_PERMITTED	2
-#define    TCPOLEN_TIMESTAMP		10
-#define    TCPOLEN_TSTAMP_APPA		(TCPOLEN_TIMESTAMP+2) /* appendix A */
-#endif
-
-/*
- * Default maximum segment size for TCP.
- * With an IP MSS of 576, this is 536,
- * but 512 is probably more convenient.
- * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
- *
- * We make this 1460 because we only care about Ethernet in the qemu context.
- */
-#undef TCP_MSS
-#define	TCP_MSS	1460
-#undef TCP6_MSS
-#define TCP6_MSS 1440
-
-#undef TCP_MAXWIN
-#define	TCP_MAXWIN	65535	/* largest value for (unscaled) window */
-
-#undef TCP_MAX_WINSHIFT
-#define TCP_MAX_WINSHIFT	14	/* maximum window shift */
-
-/*
- * User-settable options (used with setsockopt).
- *
- * We don't use the system headers on unix because we have conflicting
- * local structures. We can't avoid the system definitions on Windows,
- * so we undefine them.
- */
-#undef TCP_NODELAY
-#define	TCP_NODELAY	0x01	/* don't delay send to coalesce packets */
-#undef TCP_MAXSEG
-
-/*
- * TCP FSM state definitions.
- * Per RFC793, September, 1981.
- */
-
-#define TCP_NSTATES     11
-
-#define TCPS_CLOSED             0       /* closed */
-#define TCPS_LISTEN             1       /* listening for connection */
-#define TCPS_SYN_SENT           2       /* active, have sent syn */
-#define TCPS_SYN_RECEIVED       3       /* have send and received syn */
-/* states < TCPS_ESTABLISHED are those where connections not established */
-#define TCPS_ESTABLISHED        4       /* established */
-#define TCPS_CLOSE_WAIT         5       /* rcvd fin, waiting for close */
-/* states > TCPS_CLOSE_WAIT are those where user has closed */
-#define TCPS_FIN_WAIT_1         6       /* have closed, sent fin */
-#define TCPS_CLOSING            7       /* closed xchd FIN; await FIN ACK */
-#define TCPS_LAST_ACK           8       /* had fin and close; await FIN ACK */
-/* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
-#define TCPS_FIN_WAIT_2         9       /* have closed, fin is acked */
-#define TCPS_TIME_WAIT          10      /* in 2*msl quiet wait after close */
-
-#define TCPS_HAVERCVDSYN(s)     ((s) >= TCPS_SYN_RECEIVED)
-#define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
-#define TCPS_HAVERCVDFIN(s)     ((s) >= TCPS_TIME_WAIT)
-
-/*
- * TCP sequence numbers are 32 bit integers operated
- * on with modular arithmetic.  These macros can be
- * used to compare such integers.
- */
-#define SEQ_LT(a,b)     ((int)((a)-(b)) < 0)
-#define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
-#define SEQ_GT(a,b)     ((int)((a)-(b)) > 0)
-#define SEQ_GEQ(a,b)    ((int)((a)-(b)) >= 0)
-
-/*
- * Macros to initialize tcp sequence numbers for
- * send and receive from initial send and receive
- * sequence numbers.
- */
-#define tcp_rcvseqinit(tp) \
-     (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
-
-#define tcp_sendseqinit(tp) \
-    (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss
-
-#define TCP_ISSINCR     (125*1024)      /* increment for tcp_iss each second */
-
-#endif
diff --git a/slirp/src/tcp_input.c b/slirp/src/tcp_input.c
deleted file mode 100644
index 50a1145..0000000
--- a/slirp/src/tcp_input.c
+++ /dev/null
@@ -1,1554 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1994
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)tcp_input.c	8.5 (Berkeley) 4/10/94
- * tcp_input.c,v 1.10 1994/10/13 18:36:32 wollman Exp
- */
-
-/*
- * Changes and additions relating to SLiRP
- * Copyright (c) 1995 Danny Gasparovski.
- */
-
-#include "slirp.h"
-#include "ip_icmp.h"
-
-#define	TCPREXMTTHRESH 3
-
-#define TCP_PAWS_IDLE	(24 * 24 * 60 * 60 * PR_SLOWHZ)
-
-/* for modulo comparisons of timestamps */
-#define TSTMP_LT(a,b)	((int)((a)-(b)) < 0)
-#define TSTMP_GEQ(a,b)	((int)((a)-(b)) >= 0)
-
-/*
- * Insert segment ti into reassembly queue of tcp with
- * control block tp.  Return TH_FIN if reassembly now includes
- * a segment with FIN.  The macro form does the common case inline
- * (segment is the next to be received on an established connection,
- * and the queue is empty), avoiding linkage into and removal
- * from the queue and repetition of various conversions.
- * Set DELACK for segments received in order, but ack immediately
- * when segments are out of order (so fast retransmit can work).
- */
-#define	TCP_REASS(tp, ti, m, so, flags) { \
-	if ((ti)->ti_seq == (tp)->rcv_nxt && \
-        tcpfrag_list_empty(tp) && \
-	    (tp)->t_state == TCPS_ESTABLISHED) { \
-		tp->t_flags |= TF_DELACK; \
-		(tp)->rcv_nxt += (ti)->ti_len; \
-		flags = (ti)->ti_flags & TH_FIN; \
-		if (so->so_emu) { \
-			if (tcp_emu((so),(m))) sbappend(so, (m)); \
-		} else \
-			sbappend((so), (m)); \
-	} else { \
-		(flags) = tcp_reass((tp), (ti), (m)); \
-		tp->t_flags |= TF_ACKNOW; \
-	} \
-}
-
-static void tcp_dooptions(struct tcpcb *tp, uint8_t *cp, int cnt,
-                          struct tcpiphdr *ti);
-static void tcp_xmit_timer(register struct tcpcb *tp, int rtt);
-
-static int
-tcp_reass(register struct tcpcb *tp, register struct tcpiphdr *ti,
-          struct mbuf *m)
-{
-	register struct tcpiphdr *q;
-	struct socket *so = tp->t_socket;
-	int flags;
-
-	/*
-	 * Call with ti==NULL after become established to
-	 * force pre-ESTABLISHED data up to user socket.
-	 */
-        if (ti == NULL)
-		goto present;
-
-	/*
-	 * Find a segment which begins after this one does.
-	 */
-	for (q = tcpfrag_list_first(tp); !tcpfrag_list_end(q, tp);
-            q = tcpiphdr_next(q))
-		if (SEQ_GT(q->ti_seq, ti->ti_seq))
-			break;
-
-	/*
-	 * If there is a preceding segment, it may provide some of
-	 * our data already.  If so, drop the data from the incoming
-	 * segment.  If it provides all of our data, drop us.
-	 */
-	if (!tcpfrag_list_end(tcpiphdr_prev(q), tp)) {
-		register int i;
-		q = tcpiphdr_prev(q);
-		/* conversion to int (in i) handles seq wraparound */
-		i = q->ti_seq + q->ti_len - ti->ti_seq;
-		if (i > 0) {
-			if (i >= ti->ti_len) {
-				m_free(m);
-				/*
-				 * Try to present any queued data
-				 * at the left window edge to the user.
-				 * This is needed after the 3-WHS
-				 * completes.
-				 */
-				goto present;   /* ??? */
-			}
-			m_adj(m, i);
-			ti->ti_len -= i;
-			ti->ti_seq += i;
-		}
-		q = tcpiphdr_next(q);
-	}
-	ti->ti_mbuf = m;
-
-	/*
-	 * While we overlap succeeding segments trim them or,
-	 * if they are completely covered, dequeue them.
-	 */
-	while (!tcpfrag_list_end(q, tp)) {
-		register int i = (ti->ti_seq + ti->ti_len) - q->ti_seq;
-		if (i <= 0)
-			break;
-		if (i < q->ti_len) {
-			q->ti_seq += i;
-			q->ti_len -= i;
-			m_adj(q->ti_mbuf, i);
-			break;
-		}
-		q = tcpiphdr_next(q);
-		m = tcpiphdr_prev(q)->ti_mbuf;
-		remque(tcpiphdr2qlink(tcpiphdr_prev(q)));
-		m_free(m);
-	}
-
-	/*
-	 * Stick new segment in its place.
-	 */
-	insque(tcpiphdr2qlink(ti), tcpiphdr2qlink(tcpiphdr_prev(q)));
-
-present:
-	/*
-	 * Present data to user, advancing rcv_nxt through
-	 * completed sequence space.
-	 */
-	if (!TCPS_HAVEESTABLISHED(tp->t_state))
-		return (0);
-	ti = tcpfrag_list_first(tp);
-	if (tcpfrag_list_end(ti, tp) || ti->ti_seq != tp->rcv_nxt)
-		return (0);
-	if (tp->t_state == TCPS_SYN_RECEIVED && ti->ti_len)
-		return (0);
-	do {
-		tp->rcv_nxt += ti->ti_len;
-		flags = ti->ti_flags & TH_FIN;
-		remque(tcpiphdr2qlink(ti));
-		m = ti->ti_mbuf;
-		ti = tcpiphdr_next(ti);
-		if (so->so_state & SS_FCANTSENDMORE)
-			m_free(m);
-		else {
-			if (so->so_emu) {
-				if (tcp_emu(so,m)) sbappend(so, m);
-			} else
-				sbappend(so, m);
-		}
-	} while (ti != (struct tcpiphdr *)tp && ti->ti_seq == tp->rcv_nxt);
-	return (flags);
-}
-
-/*
- * TCP input routine, follows pages 65-76 of the
- * protocol specification dated September, 1981 very closely.
- */
-void
-tcp_input(struct mbuf *m, int iphlen, struct socket *inso, unsigned short af)
-{
-	struct ip save_ip, *ip;
-	struct ip6 save_ip6, *ip6;
-	register struct tcpiphdr *ti;
-	char *optp = NULL;
-	int optlen = 0;
-	int len, tlen, off;
-        register struct tcpcb *tp = NULL;
-	register int tiflags;
-        struct socket *so = NULL;
-	int todrop, acked, ourfinisacked, needoutput = 0;
-	int iss = 0;
-	uint32_t tiwin;
-	int ret;
-	struct sockaddr_storage lhost, fhost;
-	struct sockaddr_in *lhost4, *fhost4;
-	struct sockaddr_in6 *lhost6, *fhost6;
-    struct gfwd_list *ex_ptr;
-    Slirp *slirp;
-
-	DEBUG_CALL("tcp_input");
-	DEBUG_ARG("m = %p  iphlen = %2d  inso = %p",
-              m, iphlen, inso);
-
-	/*
-	 * If called with m == 0, then we're continuing the connect
-	 */
-	if (m == NULL) {
-		so = inso;
-		slirp = so->slirp;
-
-		/* Re-set a few variables */
-		tp = sototcpcb(so);
-		m = so->so_m;
-                so->so_m = NULL;
-		ti = so->so_ti;
-		tiwin = ti->ti_win;
-		tiflags = ti->ti_flags;
-
-		goto cont_conn;
-	}
-	slirp = m->slirp;
-
-	ip = mtod(m, struct ip *);
-	ip6 = mtod(m, struct ip6 *);
-
-	switch (af) {
-	case AF_INET:
-	    if (iphlen > sizeof(struct ip)) {
-	        ip_stripoptions(m, (struct mbuf *)0);
-	        iphlen = sizeof(struct ip);
-	    }
-	    /* XXX Check if too short */
-
-
-	    /*
-	     * Save a copy of the IP header in case we want restore it
-	     * for sending an ICMP error message in response.
-	     */
-	    save_ip = *ip;
-	    save_ip.ip_len += iphlen;
-
-	    /*
-	     * Get IP and TCP header together in first mbuf.
-	     * Note: IP leaves IP header in first mbuf.
-	     */
-	    m->m_data -= sizeof(struct tcpiphdr) - sizeof(struct ip)
-	                                         - sizeof(struct tcphdr);
-	    m->m_len += sizeof(struct tcpiphdr) - sizeof(struct ip)
-	                                        - sizeof(struct tcphdr);
-	    ti = mtod(m, struct tcpiphdr *);
-
-	    /*
-	     * Checksum extended TCP header and data.
-	     */
-	    tlen = ip->ip_len;
-	    tcpiphdr2qlink(ti)->next = tcpiphdr2qlink(ti)->prev = NULL;
-	    memset(&ti->ih_mbuf, 0 , sizeof(struct mbuf_ptr));
-	    memset(&ti->ti, 0, sizeof(ti->ti));
-	    ti->ti_x0 = 0;
-	    ti->ti_src = save_ip.ip_src;
-	    ti->ti_dst = save_ip.ip_dst;
-	    ti->ti_pr = save_ip.ip_p;
-	    ti->ti_len = htons((uint16_t)tlen);
-	    break;
-
-	case AF_INET6:
-	    /*
-	     * Save a copy of the IP header in case we want restore it
-	     * for sending an ICMP error message in response.
-	     */
-	    save_ip6 = *ip6;
-	    /*
-	     * Get IP and TCP header together in first mbuf.
-	     * Note: IP leaves IP header in first mbuf.
-	     */
-	    m->m_data -= sizeof(struct tcpiphdr) - (sizeof(struct ip6)
-	                                         + sizeof(struct tcphdr));
-	    m->m_len  += sizeof(struct tcpiphdr) - (sizeof(struct ip6)
-	                                         + sizeof(struct tcphdr));
-	    ti = mtod(m, struct tcpiphdr *);
-
-	    tlen = ip6->ip_pl;
-	    tcpiphdr2qlink(ti)->next = tcpiphdr2qlink(ti)->prev = NULL;
-	    memset(&ti->ih_mbuf, 0 , sizeof(struct mbuf_ptr));
-	    memset(&ti->ti, 0, sizeof(ti->ti));
-	    ti->ti_x0 = 0;
-	    ti->ti_src6 = save_ip6.ip_src;
-	    ti->ti_dst6 = save_ip6.ip_dst;
-	    ti->ti_nh6 = save_ip6.ip_nh;
-	    ti->ti_len = htons((uint16_t)tlen);
-	    break;
-
-	default:
-	    g_assert_not_reached();
-	}
-
-	len = ((sizeof(struct tcpiphdr) - sizeof(struct tcphdr)) + tlen);
-	if (cksum(m, len)) {
-	    goto drop;
-	}
-
-	/*
-	 * Check that TCP offset makes sense,
-	 * pull out TCP options and adjust length.		XXX
-	 */
-	off = ti->ti_off << 2;
-	if (off < sizeof (struct tcphdr) || off > tlen) {
-	  goto drop;
-	}
-	tlen -= off;
-	ti->ti_len = tlen;
-	if (off > sizeof (struct tcphdr)) {
-	  optlen = off - sizeof (struct tcphdr);
-	  optp = mtod(m, char *) + sizeof (struct tcpiphdr);
-	}
-	tiflags = ti->ti_flags;
-
-	/*
-	 * Convert TCP protocol specific fields to host format.
-	 */
-	NTOHL(ti->ti_seq);
-	NTOHL(ti->ti_ack);
-	NTOHS(ti->ti_win);
-	NTOHS(ti->ti_urp);
-
-	/*
-	 * Drop TCP, IP headers and TCP options.
-	 */
-	m->m_data += sizeof(struct tcpiphdr)+off-sizeof(struct tcphdr);
-	m->m_len  -= sizeof(struct tcpiphdr)+off-sizeof(struct tcphdr);
-
-	/*
-	 * Locate pcb for segment.
-	 */
-findso:
-	lhost.ss_family = af;
-	fhost.ss_family = af;
-	switch (af) {
-	case AF_INET:
-	    lhost4 = (struct sockaddr_in *) &lhost;
-	    lhost4->sin_addr = ti->ti_src;
-	    lhost4->sin_port = ti->ti_sport;
-	    fhost4 = (struct sockaddr_in *) &fhost;
-	    fhost4->sin_addr = ti->ti_dst;
-	    fhost4->sin_port = ti->ti_dport;
-	    break;
-	case AF_INET6:
-	    lhost6 = (struct sockaddr_in6 *) &lhost;
-	    lhost6->sin6_addr = ti->ti_src6;
-	    lhost6->sin6_port = ti->ti_sport;
-	    fhost6 = (struct sockaddr_in6 *) &fhost;
-	    fhost6->sin6_addr = ti->ti_dst6;
-	    fhost6->sin6_port = ti->ti_dport;
-	    break;
-	default:
-	    g_assert_not_reached();
-	}
-
-	so = solookup(&slirp->tcp_last_so, &slirp->tcb, &lhost, &fhost);
-
-	/*
-	 * If the state is CLOSED (i.e., TCB does not exist) then
-	 * all data in the incoming segment is discarded.
-	 * If the TCB exists but is in CLOSED state, it is embryonic,
-	 * but should either do a listen or a connect soon.
-	 *
-	 * state == CLOSED means we've done socreate() but haven't
-	 * attached it to a protocol yet...
-	 *
-	 * XXX If a TCB does not exist, and the TH_SYN flag is
-	 * the only flag set, then create a session, mark it
-	 * as if it was LISTENING, and continue...
-	 */
-        if (so == NULL) {
-          /* TODO: IPv6 */
-          if (slirp->restricted) {
-            /* Any hostfwds will have an existing socket, so we only get here
-             * for non-hostfwd connections. These should be dropped, unless it
-             * happens to be a guestfwd.
-             */
-            for (ex_ptr = slirp->guestfwd_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
-                if (ex_ptr->ex_fport == ti->ti_dport &&
-                    ti->ti_dst.s_addr == ex_ptr->ex_addr.s_addr) {
-                    break;
-                }
-            }
-            if (!ex_ptr) {
-                goto dropwithreset;
-            }
-          }
-
-	  if ((tiflags & (TH_SYN|TH_FIN|TH_RST|TH_URG|TH_ACK)) != TH_SYN)
-	    goto dropwithreset;
-
-          so = socreate(slirp);
-	  if (tcp_attach(so) < 0) {
-            g_free(so); /* Not sofree (if it failed, it's not insqued) */
-            goto dropwithreset;
-	  }
-
-	  sbreserve(&so->so_snd, TCP_SNDSPACE);
-	  sbreserve(&so->so_rcv, TCP_RCVSPACE);
-
-	  so->lhost.ss = lhost;
-	  so->fhost.ss = fhost;
-
-	  so->so_iptos = tcp_tos(so);
-	  if (so->so_iptos == 0) {
-	      switch (af) {
-	      case AF_INET:
-	          so->so_iptos = ((struct ip *)ti)->ip_tos;
-	          break;
-	      case AF_INET6:
-	          break;
-	      default:
-	          g_assert_not_reached();
-	      }
-	  }
-
-	  tp = sototcpcb(so);
-	  tp->t_state = TCPS_LISTEN;
-	}
-
-        /*
-         * If this is a still-connecting socket, this probably
-         * a retransmit of the SYN.  Whether it's a retransmit SYN
-	 * or something else, we nuke it.
-         */
-        if (so->so_state & SS_ISFCONNECTING)
-                goto drop;
-
-	tp = sototcpcb(so);
-
-	/* XXX Should never fail */
-        if (tp == NULL)
-		goto dropwithreset;
-	if (tp->t_state == TCPS_CLOSED)
-		goto drop;
-
-	tiwin = ti->ti_win;
-
-	/*
-	 * Segment received on connection.
-	 * Reset idle time and keep-alive timer.
-	 */
-	tp->t_idle = 0;
-	if (slirp_do_keepalive)
-	   tp->t_timer[TCPT_KEEP] = TCPTV_KEEPINTVL;
-	else
-	   tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_IDLE;
-
-	/*
-	 * Process options if not in LISTEN state,
-	 * else do it below (after getting remote address).
-	 */
-	if (optp && tp->t_state != TCPS_LISTEN)
-		tcp_dooptions(tp, (uint8_t *)optp, optlen, ti);
-
-	/*
-	 * Header prediction: check for the two common cases
-	 * of a uni-directional data xfer.  If the packet has
-	 * no control flags, is in-sequence, the window didn't
-	 * change and we're not retransmitting, it's a
-	 * candidate.  If the length is zero and the ack moved
-	 * forward, we're the sender side of the xfer.  Just
-	 * free the data acked & wake any higher level process
-	 * that was blocked waiting for space.  If the length
-	 * is non-zero and the ack didn't move, we're the
-	 * receiver side.  If we're getting packets in-order
-	 * (the reassembly queue is empty), add the data to
-	 * the socket buffer and note that we need a delayed ack.
-	 *
-	 * XXX Some of these tests are not needed
-	 * eg: the tiwin == tp->snd_wnd prevents many more
-	 * predictions.. with no *real* advantage..
-	 */
-	if (tp->t_state == TCPS_ESTABLISHED &&
-	    (tiflags & (TH_SYN|TH_FIN|TH_RST|TH_URG|TH_ACK)) == TH_ACK &&
-	    ti->ti_seq == tp->rcv_nxt &&
-	    tiwin && tiwin == tp->snd_wnd &&
-	    tp->snd_nxt == tp->snd_max) {
-		if (ti->ti_len == 0) {
-			if (SEQ_GT(ti->ti_ack, tp->snd_una) &&
-			    SEQ_LEQ(ti->ti_ack, tp->snd_max) &&
-			    tp->snd_cwnd >= tp->snd_wnd) {
-				/*
-				 * this is a pure ack for outstanding data.
-				 */
-				if (tp->t_rtt &&
-				    SEQ_GT(ti->ti_ack, tp->t_rtseq))
-					tcp_xmit_timer(tp, tp->t_rtt);
-				acked = ti->ti_ack - tp->snd_una;
-				sodrop(so, acked);
-				tp->snd_una = ti->ti_ack;
-				m_free(m);
-
-				/*
-				 * If all outstanding data are acked, stop
-				 * retransmit timer, otherwise restart timer
-				 * using current (possibly backed-off) value.
-				 * If process is waiting for space,
-				 * wakeup/selwakeup/signal.  If data
-				 * are ready to send, let tcp_output
-				 * decide between more output or persist.
-				 */
-				if (tp->snd_una == tp->snd_max)
-					tp->t_timer[TCPT_REXMT] = 0;
-				else if (tp->t_timer[TCPT_PERSIST] == 0)
-					tp->t_timer[TCPT_REXMT] = tp->t_rxtcur;
-
-				/*
-				 * This is called because sowwakeup might have
-				 * put data into so_snd.  Since we don't so sowwakeup,
-				 * we don't need this.. XXX???
-				 */
-				if (so->so_snd.sb_cc)
-					(void) tcp_output(tp);
-
-				return;
-			}
-		} else if (ti->ti_ack == tp->snd_una &&
-		    tcpfrag_list_empty(tp) &&
-		    ti->ti_len <= sbspace(&so->so_rcv)) {
-			/*
-			 * this is a pure, in-sequence data packet
-			 * with nothing on the reassembly queue and
-			 * we have enough buffer space to take it.
-			 */
-			tp->rcv_nxt += ti->ti_len;
-			/*
-			 * Add data to socket buffer.
-			 */
-			if (so->so_emu) {
-				if (tcp_emu(so,m)) sbappend(so, m);
-			} else
-				sbappend(so, m);
-
-			/*
-			 * If this is a short packet, then ACK now - with Nagel
-			 *	congestion avoidance sender won't send more until
-			 *	he gets an ACK.
-			 *
-			 * It is better to not delay acks at all to maximize
-			 * TCP throughput.  See RFC 2581.
-			 */
-			tp->t_flags |= TF_ACKNOW;
-			tcp_output(tp);
-			return;
-		}
-	} /* header prediction */
-	/*
-	 * Calculate amount of space in receive window,
-	 * and then do TCP input processing.
-	 * Receive window is amount of space in rcv queue,
-	 * but not less than advertised window.
-	 */
-	{ int win;
-          win = sbspace(&so->so_rcv);
-	  if (win < 0)
-	    win = 0;
-          tp->rcv_wnd = MAX(win, (int)(tp->rcv_adv - tp->rcv_nxt));
-	}
-
-	switch (tp->t_state) {
-
-	/*
-	 * If the state is LISTEN then ignore segment if it contains an RST.
-	 * If the segment contains an ACK then it is bad and send a RST.
-	 * If it does not contain a SYN then it is not interesting; drop it.
-	 * Don't bother responding if the destination was a broadcast.
-	 * Otherwise initialize tp->rcv_nxt, and tp->irs, select an initial
-	 * tp->iss, and send a segment:
-	 *     <SEQ=ISS><ACK=RCV_NXT><CTL=SYN,ACK>
-	 * Also initialize tp->snd_nxt to tp->iss+1 and tp->snd_una to tp->iss.
-	 * Fill in remote peer address fields if not previously specified.
-	 * Enter SYN_RECEIVED state, and process any other fields of this
-	 * segment in this state.
-	 */
-	case TCPS_LISTEN: {
-
-	  if (tiflags & TH_RST)
-	    goto drop;
-	  if (tiflags & TH_ACK)
-	    goto dropwithreset;
-	  if ((tiflags & TH_SYN) == 0)
-	    goto drop;
-
-	  /*
-	   * This has way too many gotos...
-	   * But a bit of spaghetti code never hurt anybody :)
-	   */
-
-	  /*
-	   * If this is destined for the control address, then flag to
-	   * tcp_ctl once connected, otherwise connect
-	   */
-          /* TODO: IPv6 */
-	  if (af == AF_INET &&
-	         (so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
-	         slirp->vnetwork_addr.s_addr) {
-	    if (so->so_faddr.s_addr != slirp->vhost_addr.s_addr &&
-		so->so_faddr.s_addr != slirp->vnameserver_addr.s_addr) {
-		/* May be an add exec */
-		for (ex_ptr = slirp->guestfwd_list; ex_ptr;
-		     ex_ptr = ex_ptr->ex_next) {
-		  if(ex_ptr->ex_fport == so->so_fport &&
-		     so->so_faddr.s_addr == ex_ptr->ex_addr.s_addr) {
-		    so->so_state |= SS_CTL;
-		    break;
-		  }
-		}
-		if (so->so_state & SS_CTL) {
-		    goto cont_input;
-		}
-	    }
-	    /* CTL_ALIAS: Do nothing, tcp_fconnect will be called on it */
-	  }
-
-	  if (so->so_emu & EMU_NOCONNECT) {
-	    so->so_emu &= ~EMU_NOCONNECT;
-	    goto cont_input;
-	  }
-
-	  if ((tcp_fconnect(so, so->so_ffamily) == -1) &&
-              (errno != EAGAIN) &&
-              (errno != EINPROGRESS) && (errno != EWOULDBLOCK)
-          ) {
-	    uint8_t code;
-	    DEBUG_MISC(" tcp fconnect errno = %d-%s", errno, strerror(errno));
-	    if(errno == ECONNREFUSED) {
-	      /* ACK the SYN, send RST to refuse the connection */
-	      tcp_respond(tp, ti, m, ti->ti_seq + 1, (tcp_seq) 0,
-			  TH_RST | TH_ACK, af);
-	    } else {
-	      switch (af) {
-	      case AF_INET:
-		code = ICMP_UNREACH_NET;
-		if (errno == EHOSTUNREACH) {
-		  code = ICMP_UNREACH_HOST;
-		}
-		break;
-	      case AF_INET6:
-		code = ICMP6_UNREACH_NO_ROUTE;
-		if (errno == EHOSTUNREACH) {
-		  code = ICMP6_UNREACH_ADDRESS;
-		}
-		break;
-	      default:
-		g_assert_not_reached();
-	      }
-	      HTONL(ti->ti_seq);             /* restore tcp header */
-	      HTONL(ti->ti_ack);
-	      HTONS(ti->ti_win);
-	      HTONS(ti->ti_urp);
-	      m->m_data -= sizeof(struct tcpiphdr)+off-sizeof(struct tcphdr);
-	      m->m_len  += sizeof(struct tcpiphdr)+off-sizeof(struct tcphdr);
-	      switch (af) {
-	      case AF_INET:
-		m->m_data += sizeof(struct tcpiphdr) - sizeof(struct ip)
-						     - sizeof(struct tcphdr);
-		m->m_len  -= sizeof(struct tcpiphdr) - sizeof(struct ip)
-						     - sizeof(struct tcphdr);
-		*ip = save_ip;
-		icmp_send_error(m, ICMP_UNREACH, code, 0, strerror(errno));
-		break;
-	      case AF_INET6:
-		m->m_data += sizeof(struct tcpiphdr) - (sizeof(struct ip6)
-						     + sizeof(struct tcphdr));
-		m->m_len  -= sizeof(struct tcpiphdr) - (sizeof(struct ip6)
-						     + sizeof(struct tcphdr));
-		*ip6 = save_ip6;
-		icmp6_send_error(m, ICMP6_UNREACH, code);
-		break;
-	      default:
-		g_assert_not_reached();
-	      }
-	    }
-            tcp_close(tp);
-	    m_free(m);
-	  } else {
-	    /*
-	     * Haven't connected yet, save the current mbuf
-	     * and ti, and return
-	     * XXX Some OS's don't tell us whether the connect()
-	     * succeeded or not.  So we must time it out.
-	     */
-	    so->so_m = m;
-	    so->so_ti = ti;
-	    tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
-	    tp->t_state = TCPS_SYN_RECEIVED;
-	    /*
-	     * Initialize receive sequence numbers now so that we can send a
-	     * valid RST if the remote end rejects our connection.
-	     */
-	    tp->irs = ti->ti_seq;
-	    tcp_rcvseqinit(tp);
-	    tcp_template(tp);
-	  }
-	  return;
-
-	cont_conn:
-	  /* m==NULL
-	   * Check if the connect succeeded
-	   */
-	  if (so->so_state & SS_NOFDREF) {
-	    tp = tcp_close(tp);
-	    goto dropwithreset;
-	  }
-	cont_input:
-	  tcp_template(tp);
-
-	  if (optp)
-	    tcp_dooptions(tp, (uint8_t *)optp, optlen, ti);
-
-	  if (iss)
-	    tp->iss = iss;
-	  else
-	    tp->iss = slirp->tcp_iss;
-	  slirp->tcp_iss += TCP_ISSINCR/2;
-	  tp->irs = ti->ti_seq;
-	  tcp_sendseqinit(tp);
-	  tcp_rcvseqinit(tp);
-	  tp->t_flags |= TF_ACKNOW;
-	  tp->t_state = TCPS_SYN_RECEIVED;
-	  tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
-	  goto trimthenstep6;
-	} /* case TCPS_LISTEN */
-
-	/*
-	 * If the state is SYN_SENT:
-	 *	if seg contains an ACK, but not for our SYN, drop the input.
-	 *	if seg contains a RST, then drop the connection.
-	 *	if seg does not contain SYN, then drop it.
-	 * Otherwise this is an acceptable SYN segment
-	 *	initialize tp->rcv_nxt and tp->irs
-	 *	if seg contains ack then advance tp->snd_una
-	 *	if SYN has been acked change to ESTABLISHED else SYN_RCVD state
-	 *	arrange for segment to be acked (eventually)
-	 *	continue processing rest of data/controls, beginning with URG
-	 */
-	case TCPS_SYN_SENT:
-		if ((tiflags & TH_ACK) &&
-		    (SEQ_LEQ(ti->ti_ack, tp->iss) ||
-		     SEQ_GT(ti->ti_ack, tp->snd_max)))
-			goto dropwithreset;
-
-		if (tiflags & TH_RST) {
-                        if (tiflags & TH_ACK) {
-                                tcp_drop(tp, 0); /* XXX Check t_softerror! */
-                        }
-			goto drop;
-		}
-
-		if ((tiflags & TH_SYN) == 0)
-			goto drop;
-		if (tiflags & TH_ACK) {
-			tp->snd_una = ti->ti_ack;
-			if (SEQ_LT(tp->snd_nxt, tp->snd_una))
-				tp->snd_nxt = tp->snd_una;
-		}
-
-		tp->t_timer[TCPT_REXMT] = 0;
-		tp->irs = ti->ti_seq;
-		tcp_rcvseqinit(tp);
-		tp->t_flags |= TF_ACKNOW;
-		if (tiflags & TH_ACK && SEQ_GT(tp->snd_una, tp->iss)) {
-			soisfconnected(so);
-			tp->t_state = TCPS_ESTABLISHED;
-
-			(void) tcp_reass(tp, (struct tcpiphdr *)0,
-				(struct mbuf *)0);
-			/*
-			 * if we didn't have to retransmit the SYN,
-			 * use its rtt as our initial srtt & rtt var.
-			 */
-			if (tp->t_rtt)
-				tcp_xmit_timer(tp, tp->t_rtt);
-		} else
-			tp->t_state = TCPS_SYN_RECEIVED;
-
-trimthenstep6:
-		/*
-		 * Advance ti->ti_seq to correspond to first data byte.
-		 * If data, trim to stay within window,
-		 * dropping FIN if necessary.
-		 */
-		ti->ti_seq++;
-		if (ti->ti_len > tp->rcv_wnd) {
-			todrop = ti->ti_len - tp->rcv_wnd;
-			m_adj(m, -todrop);
-			ti->ti_len = tp->rcv_wnd;
-			tiflags &= ~TH_FIN;
-		}
-		tp->snd_wl1 = ti->ti_seq - 1;
-		tp->rcv_up = ti->ti_seq;
-		goto step6;
-	} /* switch tp->t_state */
-	/*
-	 * States other than LISTEN or SYN_SENT.
-	 * Check that at least some bytes of segment are within
-	 * receive window.  If segment begins before rcv_nxt,
-	 * drop leading data (and SYN); if nothing left, just ack.
-	 */
-	todrop = tp->rcv_nxt - ti->ti_seq;
-	if (todrop > 0) {
-		if (tiflags & TH_SYN) {
-			tiflags &= ~TH_SYN;
-			ti->ti_seq++;
-			if (ti->ti_urp > 1)
-				ti->ti_urp--;
-			else
-				tiflags &= ~TH_URG;
-			todrop--;
-		}
-		/*
-		 * Following if statement from Stevens, vol. 2, p. 960.
-		 */
-		if (todrop > ti->ti_len
-		    || (todrop == ti->ti_len && (tiflags & TH_FIN) == 0)) {
-			/*
-			 * Any valid FIN must be to the left of the window.
-			 * At this point the FIN must be a duplicate or out
-			 * of sequence; drop it.
-			 */
-			tiflags &= ~TH_FIN;
-
-			/*
-			 * Send an ACK to resynchronize and drop any data.
-			 * But keep on processing for RST or ACK.
-			 */
-			tp->t_flags |= TF_ACKNOW;
-			todrop = ti->ti_len;
-		}
-		m_adj(m, todrop);
-		ti->ti_seq += todrop;
-		ti->ti_len -= todrop;
-		if (ti->ti_urp > todrop)
-			ti->ti_urp -= todrop;
-		else {
-			tiflags &= ~TH_URG;
-			ti->ti_urp = 0;
-		}
-	}
-	/*
-	 * If new data are received on a connection after the
-	 * user processes are gone, then RST the other end.
-	 */
-	if ((so->so_state & SS_NOFDREF) &&
-	    tp->t_state > TCPS_CLOSE_WAIT && ti->ti_len) {
-		tp = tcp_close(tp);
-		goto dropwithreset;
-	}
-
-	/*
-	 * If segment ends after window, drop trailing data
-	 * (and PUSH and FIN); if nothing left, just ACK.
-	 */
-	todrop = (ti->ti_seq+ti->ti_len) - (tp->rcv_nxt+tp->rcv_wnd);
-	if (todrop > 0) {
-		if (todrop >= ti->ti_len) {
-			/*
-			 * If a new connection request is received
-			 * while in TIME_WAIT, drop the old connection
-			 * and start over if the sequence numbers
-			 * are above the previous ones.
-			 */
-			if (tiflags & TH_SYN &&
-			    tp->t_state == TCPS_TIME_WAIT &&
-			    SEQ_GT(ti->ti_seq, tp->rcv_nxt)) {
-				iss = tp->rcv_nxt + TCP_ISSINCR;
-				tp = tcp_close(tp);
-				goto findso;
-			}
-			/*
-			 * If window is closed can only take segments at
-			 * window edge, and have to drop data and PUSH from
-			 * incoming segments.  Continue processing, but
-			 * remember to ack.  Otherwise, drop segment
-			 * and ack.
-			 */
-			if (tp->rcv_wnd == 0 && ti->ti_seq == tp->rcv_nxt) {
-				tp->t_flags |= TF_ACKNOW;
-			} else {
-				goto dropafterack;
-			}
-		}
-		m_adj(m, -todrop);
-		ti->ti_len -= todrop;
-		tiflags &= ~(TH_PUSH|TH_FIN);
-	}
-
-	/*
-	 * If the RST bit is set examine the state:
-	 *    SYN_RECEIVED STATE:
-	 *	If passive open, return to LISTEN state.
-	 *	If active open, inform user that connection was refused.
-	 *    ESTABLISHED, FIN_WAIT_1, FIN_WAIT2, CLOSE_WAIT STATES:
-	 *	Inform user that connection was reset, and close tcb.
-	 *    CLOSING, LAST_ACK, TIME_WAIT STATES
-	 *	Close the tcb.
-	 */
-	if (tiflags&TH_RST) switch (tp->t_state) {
-
-	case TCPS_SYN_RECEIVED:
-	case TCPS_ESTABLISHED:
-	case TCPS_FIN_WAIT_1:
-	case TCPS_FIN_WAIT_2:
-	case TCPS_CLOSE_WAIT:
-		tp->t_state = TCPS_CLOSED;
-                tcp_close(tp);
-		goto drop;
-
-	case TCPS_CLOSING:
-	case TCPS_LAST_ACK:
-	case TCPS_TIME_WAIT:
-                tcp_close(tp);
-		goto drop;
-	}
-
-	/*
-	 * If a SYN is in the window, then this is an
-	 * error and we send an RST and drop the connection.
-	 */
-	if (tiflags & TH_SYN) {
-		tp = tcp_drop(tp,0);
-		goto dropwithreset;
-	}
-
-	/*
-	 * If the ACK bit is off we drop the segment and return.
-	 */
-	if ((tiflags & TH_ACK) == 0) goto drop;
-
-	/*
-	 * Ack processing.
-	 */
-	switch (tp->t_state) {
-	/*
-	 * In SYN_RECEIVED state if the ack ACKs our SYN then enter
-	 * ESTABLISHED state and continue processing, otherwise
-	 * send an RST.  una<=ack<=max
-	 */
-	case TCPS_SYN_RECEIVED:
-
-		if (SEQ_GT(tp->snd_una, ti->ti_ack) ||
-		    SEQ_GT(ti->ti_ack, tp->snd_max))
-			goto dropwithreset;
-		tp->t_state = TCPS_ESTABLISHED;
-		/*
-		 * The sent SYN is ack'ed with our sequence number +1
-		 * The first data byte already in the buffer will get
-		 * lost if no correction is made.  This is only needed for
-		 * SS_CTL since the buffer is empty otherwise.
-		 * tp->snd_una++; or:
-		 */
-		tp->snd_una=ti->ti_ack;
-		if (so->so_state & SS_CTL) {
-		  /* So tcp_ctl reports the right state */
-		  ret = tcp_ctl(so);
-		  if (ret == 1) {
-		    soisfconnected(so);
-		    so->so_state &= ~SS_CTL;   /* success XXX */
-		  } else if (ret == 2) {
-		    so->so_state &= SS_PERSISTENT_MASK;
-		    so->so_state |= SS_NOFDREF; /* CTL_CMD */
-		  } else {
-		    needoutput = 1;
-		    tp->t_state = TCPS_FIN_WAIT_1;
-		  }
-		} else {
-		  soisfconnected(so);
-		}
-
-		(void) tcp_reass(tp, (struct tcpiphdr *)0, (struct mbuf *)0);
-		tp->snd_wl1 = ti->ti_seq - 1;
-		/* Avoid ack processing; snd_una==ti_ack  =>  dup ack */
-		goto synrx_to_est;
-		/* fall into ... */
-
-	/*
-	 * In ESTABLISHED state: drop duplicate ACKs; ACK out of range
-	 * ACKs.  If the ack is in the range
-	 *	tp->snd_una < ti->ti_ack <= tp->snd_max
-	 * then advance tp->snd_una to ti->ti_ack and drop
-	 * data from the retransmission queue.  If this ACK reflects
-	 * more up to date window information we update our window information.
-	 */
-	case TCPS_ESTABLISHED:
-	case TCPS_FIN_WAIT_1:
-	case TCPS_FIN_WAIT_2:
-	case TCPS_CLOSE_WAIT:
-	case TCPS_CLOSING:
-	case TCPS_LAST_ACK:
-	case TCPS_TIME_WAIT:
-
-		if (SEQ_LEQ(ti->ti_ack, tp->snd_una)) {
-			if (ti->ti_len == 0 && tiwin == tp->snd_wnd) {
-			  DEBUG_MISC(" dup ack  m = %p  so = %p", m, so);
-				/*
-				 * If we have outstanding data (other than
-				 * a window probe), this is a completely
-				 * duplicate ack (ie, window info didn't
-				 * change), the ack is the biggest we've
-				 * seen and we've seen exactly our rexmt
-				 * threshold of them, assume a packet
-				 * has been dropped and retransmit it.
-				 * Kludge snd_nxt & the congestion
-				 * window so we send only this one
-				 * packet.
-				 *
-				 * We know we're losing at the current
-				 * window size so do congestion avoidance
-				 * (set ssthresh to half the current window
-				 * and pull our congestion window back to
-				 * the new ssthresh).
-				 *
-				 * Dup acks mean that packets have left the
-				 * network (they're now cached at the receiver)
-				 * so bump cwnd by the amount in the receiver
-				 * to keep a constant cwnd packets in the
-				 * network.
-				 */
-				if (tp->t_timer[TCPT_REXMT] == 0 ||
-				    ti->ti_ack != tp->snd_una)
-					tp->t_dupacks = 0;
-				else if (++tp->t_dupacks == TCPREXMTTHRESH) {
-					tcp_seq onxt = tp->snd_nxt;
-					unsigned win =
-                                                MIN(tp->snd_wnd, tp->snd_cwnd) /
-                                                2 / tp->t_maxseg;
-
-					if (win < 2)
-						win = 2;
-					tp->snd_ssthresh = win * tp->t_maxseg;
-					tp->t_timer[TCPT_REXMT] = 0;
-					tp->t_rtt = 0;
-					tp->snd_nxt = ti->ti_ack;
-					tp->snd_cwnd = tp->t_maxseg;
-					(void) tcp_output(tp);
-					tp->snd_cwnd = tp->snd_ssthresh +
-					       tp->t_maxseg * tp->t_dupacks;
-					if (SEQ_GT(onxt, tp->snd_nxt))
-						tp->snd_nxt = onxt;
-					goto drop;
-				} else if (tp->t_dupacks > TCPREXMTTHRESH) {
-					tp->snd_cwnd += tp->t_maxseg;
-					(void) tcp_output(tp);
-					goto drop;
-				}
-			} else
-				tp->t_dupacks = 0;
-			break;
-		}
-	synrx_to_est:
-		/*
-		 * If the congestion window was inflated to account
-		 * for the other side's cached packets, retract it.
-		 */
-		if (tp->t_dupacks > TCPREXMTTHRESH &&
-		    tp->snd_cwnd > tp->snd_ssthresh)
-			tp->snd_cwnd = tp->snd_ssthresh;
-		tp->t_dupacks = 0;
-		if (SEQ_GT(ti->ti_ack, tp->snd_max)) {
-			goto dropafterack;
-		}
-		acked = ti->ti_ack - tp->snd_una;
-
-		/*
-		 * If transmit timer is running and timed sequence
-		 * number was acked, update smoothed round trip time.
-		 * Since we now have an rtt measurement, cancel the
-		 * timer backoff (cf., Phil Karn's retransmit alg.).
-		 * Recompute the initial retransmit timer.
-		 */
-		if (tp->t_rtt && SEQ_GT(ti->ti_ack, tp->t_rtseq))
-			tcp_xmit_timer(tp,tp->t_rtt);
-
-		/*
-		 * If all outstanding data is acked, stop retransmit
-		 * timer and remember to restart (more output or persist).
-		 * If there is more data to be acked, restart retransmit
-		 * timer, using current (possibly backed-off) value.
-		 */
-		if (ti->ti_ack == tp->snd_max) {
-			tp->t_timer[TCPT_REXMT] = 0;
-			needoutput = 1;
-		} else if (tp->t_timer[TCPT_PERSIST] == 0)
-			tp->t_timer[TCPT_REXMT] = tp->t_rxtcur;
-		/*
-		 * When new data is acked, open the congestion window.
-		 * If the window gives us less than ssthresh packets
-		 * in flight, open exponentially (maxseg per packet).
-		 * Otherwise open linearly: maxseg per window
-		 * (maxseg^2 / cwnd per packet).
-		 */
-		{
-		  register unsigned cw = tp->snd_cwnd;
-		  register unsigned incr = tp->t_maxseg;
-
-		  if (cw > tp->snd_ssthresh)
-		    incr = incr * incr / cw;
-                  tp->snd_cwnd = MIN(cw + incr, TCP_MAXWIN << tp->snd_scale);
-		}
-		if (acked > so->so_snd.sb_cc) {
-			tp->snd_wnd -= so->so_snd.sb_cc;
-			sodrop(so, (int)so->so_snd.sb_cc);
-			ourfinisacked = 1;
-		} else {
-			sodrop(so, acked);
-			tp->snd_wnd -= acked;
-			ourfinisacked = 0;
-		}
-		tp->snd_una = ti->ti_ack;
-		if (SEQ_LT(tp->snd_nxt, tp->snd_una))
-			tp->snd_nxt = tp->snd_una;
-
-		switch (tp->t_state) {
-
-		/*
-		 * In FIN_WAIT_1 STATE in addition to the processing
-		 * for the ESTABLISHED state if our FIN is now acknowledged
-		 * then enter FIN_WAIT_2.
-		 */
-		case TCPS_FIN_WAIT_1:
-			if (ourfinisacked) {
-				/*
-				 * If we can't receive any more
-				 * data, then closing user can proceed.
-				 * Starting the timer is contrary to the
-				 * specification, but if we don't get a FIN
-				 * we'll hang forever.
-				 */
-				if (so->so_state & SS_FCANTRCVMORE) {
-					tp->t_timer[TCPT_2MSL] = TCP_MAXIDLE;
-				}
-				tp->t_state = TCPS_FIN_WAIT_2;
-			}
-			break;
-
-		/*
-		 * In CLOSING STATE in addition to the processing for
-		 * the ESTABLISHED state if the ACK acknowledges our FIN
-		 * then enter the TIME-WAIT state, otherwise ignore
-		 * the segment.
-		 */
-		case TCPS_CLOSING:
-			if (ourfinisacked) {
-				tp->t_state = TCPS_TIME_WAIT;
-				tcp_canceltimers(tp);
-				tp->t_timer[TCPT_2MSL] = 2 * TCPTV_MSL;
-			}
-			break;
-
-		/*
-		 * In LAST_ACK, we may still be waiting for data to drain
-		 * and/or to be acked, as well as for the ack of our FIN.
-		 * If our FIN is now acknowledged, delete the TCB,
-		 * enter the closed state and return.
-		 */
-		case TCPS_LAST_ACK:
-			if (ourfinisacked) {
-                                tcp_close(tp);
-				goto drop;
-			}
-			break;
-
-		/*
-		 * In TIME_WAIT state the only thing that should arrive
-		 * is a retransmission of the remote FIN.  Acknowledge
-		 * it and restart the finack timer.
-		 */
-		case TCPS_TIME_WAIT:
-			tp->t_timer[TCPT_2MSL] = 2 * TCPTV_MSL;
-			goto dropafterack;
-		}
-	} /* switch(tp->t_state) */
-
-step6:
-	/*
-	 * Update window information.
-	 * Don't look at window if no ACK: TAC's send garbage on first SYN.
-	 */
-	if ((tiflags & TH_ACK) &&
-	    (SEQ_LT(tp->snd_wl1, ti->ti_seq) ||
-	    (tp->snd_wl1 == ti->ti_seq && (SEQ_LT(tp->snd_wl2, ti->ti_ack) ||
-	    (tp->snd_wl2 == ti->ti_ack && tiwin > tp->snd_wnd))))) {
-		tp->snd_wnd = tiwin;
-		tp->snd_wl1 = ti->ti_seq;
-		tp->snd_wl2 = ti->ti_ack;
-		if (tp->snd_wnd > tp->max_sndwnd)
-			tp->max_sndwnd = tp->snd_wnd;
-		needoutput = 1;
-	}
-
-	/*
-	 * Process segments with URG.
-	 */
-	if ((tiflags & TH_URG) && ti->ti_urp &&
-	    TCPS_HAVERCVDFIN(tp->t_state) == 0) {
-		/*
-		 * This is a kludge, but if we receive and accept
-		 * random urgent pointers, we'll crash in
-		 * soreceive.  It's hard to imagine someone
-		 * actually wanting to send this much urgent data.
-		 */
-		if (ti->ti_urp + so->so_rcv.sb_cc > so->so_rcv.sb_datalen) {
-			ti->ti_urp = 0;
-			tiflags &= ~TH_URG;
-			goto dodata;
-		}
-		/*
-		 * If this segment advances the known urgent pointer,
-		 * then mark the data stream.  This should not happen
-		 * in CLOSE_WAIT, CLOSING, LAST_ACK or TIME_WAIT STATES since
-		 * a FIN has been received from the remote side.
-		 * In these states we ignore the URG.
-		 *
-		 * According to RFC961 (Assigned Protocols),
-		 * the urgent pointer points to the last octet
-		 * of urgent data.  We continue, however,
-		 * to consider it to indicate the first octet
-		 * of data past the urgent section as the original
-		 * spec states (in one of two places).
-		 */
-		if (SEQ_GT(ti->ti_seq+ti->ti_urp, tp->rcv_up)) {
-			tp->rcv_up = ti->ti_seq + ti->ti_urp;
-			so->so_urgc =  so->so_rcv.sb_cc +
-				(tp->rcv_up - tp->rcv_nxt); /* -1; */
-			tp->rcv_up = ti->ti_seq + ti->ti_urp;
-
-		}
-	} else
-		/*
-		 * If no out of band data is expected,
-		 * pull receive urgent pointer along
-		 * with the receive window.
-		 */
-		if (SEQ_GT(tp->rcv_nxt, tp->rcv_up))
-			tp->rcv_up = tp->rcv_nxt;
-dodata:
-
-	/*
-	 * If this is a small packet, then ACK now - with Nagel
-	 *      congestion avoidance sender won't send more until
-	 *      he gets an ACK.
-	 */
-	if (ti->ti_len && (unsigned)ti->ti_len <= 5 &&
-	    ((struct tcpiphdr_2 *)ti)->first_char == (char)27) {
-		tp->t_flags |= TF_ACKNOW;
-	}
-
-	/*
-	 * Process the segment text, merging it into the TCP sequencing queue,
-	 * and arranging for acknowledgment of receipt if necessary.
-	 * This process logically involves adjusting tp->rcv_wnd as data
-	 * is presented to the user (this happens in tcp_usrreq.c,
-	 * case PRU_RCVD).  If a FIN has already been received on this
-	 * connection then we just ignore the text.
-	 */
-	if ((ti->ti_len || (tiflags&TH_FIN)) &&
-	    TCPS_HAVERCVDFIN(tp->t_state) == 0) {
-		TCP_REASS(tp, ti, m, so, tiflags);
-	} else {
-		m_free(m);
-		tiflags &= ~TH_FIN;
-	}
-
-	/*
-	 * If FIN is received ACK the FIN and let the user know
-	 * that the connection is closing.
-	 */
-	if (tiflags & TH_FIN) {
-		if (TCPS_HAVERCVDFIN(tp->t_state) == 0) {
-			/*
-			 * If we receive a FIN we can't send more data,
-			 * set it SS_FDRAIN
-                         * Shutdown the socket if there is no rx data in the
-			 * buffer.
-			 * soread() is called on completion of shutdown() and
-			 * will got to TCPS_LAST_ACK, and use tcp_output()
-			 * to send the FIN.
-			 */
-			sofwdrain(so);
-
-			tp->t_flags |= TF_ACKNOW;
-			tp->rcv_nxt++;
-		}
-		switch (tp->t_state) {
-
-		/*
-		 * In SYN_RECEIVED and ESTABLISHED STATES
-		 * enter the CLOSE_WAIT state.
-		 */
-		case TCPS_SYN_RECEIVED:
-		case TCPS_ESTABLISHED:
-		  if(so->so_emu == EMU_CTL)        /* no shutdown on socket */
-		    tp->t_state = TCPS_LAST_ACK;
-		  else
-		    tp->t_state = TCPS_CLOSE_WAIT;
-		  break;
-
-		/*
-		 * If still in FIN_WAIT_1 STATE FIN has not been acked so
-		 * enter the CLOSING state.
-		 */
-		case TCPS_FIN_WAIT_1:
-			tp->t_state = TCPS_CLOSING;
-			break;
-
-		/*
-		 * In FIN_WAIT_2 state enter the TIME_WAIT state,
-		 * starting the time-wait timer, turning off the other
-		 * standard timers.
-		 */
-		case TCPS_FIN_WAIT_2:
-			tp->t_state = TCPS_TIME_WAIT;
-			tcp_canceltimers(tp);
-			tp->t_timer[TCPT_2MSL] = 2 * TCPTV_MSL;
-			break;
-
-		/*
-		 * In TIME_WAIT state restart the 2 MSL time_wait timer.
-		 */
-		case TCPS_TIME_WAIT:
-			tp->t_timer[TCPT_2MSL] = 2 * TCPTV_MSL;
-			break;
-		}
-	}
-
-	/*
-	 * Return any desired output.
-	 */
-	if (needoutput || (tp->t_flags & TF_ACKNOW)) {
-		(void) tcp_output(tp);
-	}
-	return;
-
-dropafterack:
-	/*
-	 * Generate an ACK dropping incoming segment if it occupies
-	 * sequence space, where the ACK reflects our state.
-	 */
-	if (tiflags & TH_RST)
-		goto drop;
-	m_free(m);
-	tp->t_flags |= TF_ACKNOW;
-	(void) tcp_output(tp);
-	return;
-
-dropwithreset:
-	/* reuses m if m!=NULL, m_free() unnecessary */
-	if (tiflags & TH_ACK)
-		tcp_respond(tp, ti, m, (tcp_seq)0, ti->ti_ack, TH_RST, af);
-	else {
-		if (tiflags & TH_SYN) ti->ti_len++;
-		tcp_respond(tp, ti, m, ti->ti_seq + ti->ti_len, (tcp_seq) 0,
-		    TH_RST | TH_ACK, af);
-	}
-
-	return;
-
-drop:
-	/*
-	 * Drop space held by incoming segment and return.
-	 */
-	m_free(m);
-}
-
-static void
-tcp_dooptions(struct tcpcb *tp, uint8_t *cp, int cnt, struct tcpiphdr *ti)
-{
-	uint16_t mss;
-	int opt, optlen;
-
-	DEBUG_CALL("tcp_dooptions");
-	DEBUG_ARG("tp = %p  cnt=%i", tp, cnt);
-
-	for (; cnt > 0; cnt -= optlen, cp += optlen) {
-		opt = cp[0];
-		if (opt == TCPOPT_EOL)
-			break;
-		if (opt == TCPOPT_NOP)
-			optlen = 1;
-		else {
-			optlen = cp[1];
-			if (optlen <= 0)
-				break;
-		}
-		switch (opt) {
-
-		default:
-			continue;
-
-		case TCPOPT_MAXSEG:
-			if (optlen != TCPOLEN_MAXSEG)
-				continue;
-			if (!(ti->ti_flags & TH_SYN))
-				continue;
-			memcpy((char *) &mss, (char *) cp + 2, sizeof(mss));
-			NTOHS(mss);
-			(void) tcp_mss(tp, mss);	/* sets t_maxseg */
-			break;
-		}
-	}
-}
-
-/*
- * Collect new round-trip time estimate
- * and update averages and current timeout.
- */
-
-static void
-tcp_xmit_timer(register struct tcpcb *tp, int rtt)
-{
-	register short delta;
-
-	DEBUG_CALL("tcp_xmit_timer");
-	DEBUG_ARG("tp = %p", tp);
-	DEBUG_ARG("rtt = %d", rtt);
-
-	if (tp->t_srtt != 0) {
-		/*
-		 * srtt is stored as fixed point with 3 bits after the
-		 * binary point (i.e., scaled by 8).  The following magic
-		 * is equivalent to the smoothing algorithm in rfc793 with
-		 * an alpha of .875 (srtt = rtt/8 + srtt*7/8 in fixed
-		 * point).  Adjust rtt to origin 0.
-		 */
-		delta = rtt - 1 - (tp->t_srtt >> TCP_RTT_SHIFT);
-		if ((tp->t_srtt += delta) <= 0)
-			tp->t_srtt = 1;
-		/*
-		 * We accumulate a smoothed rtt variance (actually, a
-		 * smoothed mean difference), then set the retransmit
-		 * timer to smoothed rtt + 4 times the smoothed variance.
-		 * rttvar is stored as fixed point with 2 bits after the
-		 * binary point (scaled by 4).  The following is
-		 * equivalent to rfc793 smoothing with an alpha of .75
-		 * (rttvar = rttvar*3/4 + |delta| / 4).  This replaces
-		 * rfc793's wired-in beta.
-		 */
-		if (delta < 0)
-			delta = -delta;
-		delta -= (tp->t_rttvar >> TCP_RTTVAR_SHIFT);
-		if ((tp->t_rttvar += delta) <= 0)
-			tp->t_rttvar = 1;
-	} else {
-		/*
-		 * No rtt measurement yet - use the unsmoothed rtt.
-		 * Set the variance to half the rtt (so our first
-		 * retransmit happens at 3*rtt).
-		 */
-		tp->t_srtt = rtt << TCP_RTT_SHIFT;
-		tp->t_rttvar = rtt << (TCP_RTTVAR_SHIFT - 1);
-	}
-	tp->t_rtt = 0;
-	tp->t_rxtshift = 0;
-
-	/*
-	 * the retransmit should happen at rtt + 4 * rttvar.
-	 * Because of the way we do the smoothing, srtt and rttvar
-	 * will each average +1/2 tick of bias.  When we compute
-	 * the retransmit timer, we want 1/2 tick of rounding and
-	 * 1 extra tick because of +-1/2 tick uncertainty in the
-	 * firing of the timer.  The bias will give us exactly the
-	 * 1.5 tick we need.  But, because the bias is
-	 * statistical, we have to test that we don't drop below
-	 * the minimum feasible timer (which is 2 ticks).
-	 */
-	TCPT_RANGESET(tp->t_rxtcur, TCP_REXMTVAL(tp),
-	    (short)tp->t_rttmin, TCPTV_REXMTMAX); /* XXX */
-
-	/*
-	 * We received an ack for a packet that wasn't retransmitted;
-	 * it is probably safe to discard any error indications we've
-	 * received recently.  This isn't quite right, but close enough
-	 * for now (a route might have failed after we sent a segment,
-	 * and the return path might not be symmetrical).
-	 */
-	tp->t_softerror = 0;
-}
-
-/*
- * Determine a reasonable value for maxseg size.
- * If the route is known, check route for mtu.
- * If none, use an mss that can be handled on the outgoing
- * interface without forcing IP to fragment; if bigger than
- * an mbuf cluster (MCLBYTES), round down to nearest multiple of MCLBYTES
- * to utilize large mbufs.  If no route is found, route has no mtu,
- * or the destination isn't local, use a default, hopefully conservative
- * size (usually 512 or the default IP max size, but no more than the mtu
- * of the interface), as we can't discover anything about intervening
- * gateways or networks.  We also initialize the congestion/slow start
- * window to be a single segment if the destination isn't local.
- * While looking at the routing entry, we also initialize other path-dependent
- * parameters from pre-set or cached values in the routing entry.
- */
-
-int
-tcp_mss(struct tcpcb *tp, unsigned offer)
-{
-	struct socket *so = tp->t_socket;
-	int mss;
-
-	DEBUG_CALL("tcp_mss");
-	DEBUG_ARG("tp = %p", tp);
-	DEBUG_ARG("offer = %d", offer);
-
-	switch (so->so_ffamily) {
-	case AF_INET:
-            mss = MIN(IF_MTU, IF_MRU) - sizeof(struct tcphdr)
-	                              - sizeof(struct ip);
-	    break;
-	case AF_INET6:
-            mss = MIN(IF_MTU, IF_MRU) - sizeof(struct tcphdr)
-	                              - sizeof(struct ip6);
-	    break;
-	default:
-	    g_assert_not_reached();
-	}
-
-	if (offer)
-            mss = MIN(mss, offer);
-        mss = MAX(mss, 32);
-	if (mss < tp->t_maxseg || offer != 0)
-	   tp->t_maxseg = mss;
-
-	tp->snd_cwnd = mss;
-
-	sbreserve(&so->so_snd, TCP_SNDSPACE + ((TCP_SNDSPACE % mss) ?
-                                               (mss - (TCP_SNDSPACE % mss)) :
-                                               0));
-	sbreserve(&so->so_rcv, TCP_RCVSPACE + ((TCP_RCVSPACE % mss) ?
-                                               (mss - (TCP_RCVSPACE % mss)) :
-                                               0));
-
-	DEBUG_MISC(" returning mss = %d", mss);
-
-	return mss;
-}
diff --git a/slirp/src/tcp_output.c b/slirp/src/tcp_output.c
deleted file mode 100644
index 6bbaf6c..0000000
--- a/slirp/src/tcp_output.c
+++ /dev/null
@@ -1,522 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1982, 1986, 1988, 1990, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)tcp_output.c	8.3 (Berkeley) 12/30/93
- * tcp_output.c,v 1.3 1994/09/15 10:36:55 davidg Exp
- */
-
-/*
- * Changes and additions relating to SLiRP
- * Copyright (c) 1995 Danny Gasparovski.
- */
-
-#include "slirp.h"
-
-static const uint8_t  tcp_outflags[TCP_NSTATES] = {
-	TH_RST|TH_ACK, 0,      TH_SYN,        TH_SYN|TH_ACK,
-	TH_ACK,        TH_ACK, TH_FIN|TH_ACK, TH_FIN|TH_ACK,
-	TH_FIN|TH_ACK, TH_ACK, TH_ACK,
-};
-
-
-#undef MAX_TCPOPTLEN
-#define MAX_TCPOPTLEN	32	/* max # bytes that go in options */
-
-/*
- * Tcp output routine: figure out what should be sent and send it.
- */
-int
-tcp_output(struct tcpcb *tp)
-{
-	register struct socket *so = tp->t_socket;
-	register long len, win;
-	int off, flags, error;
-	register struct mbuf *m;
-	register struct tcpiphdr *ti, tcpiph_save;
-	struct ip *ip;
-	struct ip6 *ip6;
-	uint8_t opt[MAX_TCPOPTLEN];
-	unsigned optlen, hdrlen;
-	int idle, sendalot;
-
-	DEBUG_CALL("tcp_output");
-	DEBUG_ARG("tp = %p", tp);
-
-	/*
-	 * Determine length of data that should be transmitted,
-	 * and flags that will be used.
-	 * If there is some data or critical controls (SYN, RST)
-	 * to send, then transmit; otherwise, investigate further.
-	 */
-	idle = (tp->snd_max == tp->snd_una);
-	if (idle && tp->t_idle >= tp->t_rxtcur)
-		/*
-		 * We have been idle for "a while" and no acks are
-		 * expected to clock out any data we send --
-		 * slow start to get ack "clock" running again.
-		 */
-		tp->snd_cwnd = tp->t_maxseg;
-again:
-	sendalot = 0;
-	off = tp->snd_nxt - tp->snd_una;
-        win = MIN(tp->snd_wnd, tp->snd_cwnd);
-
-	flags = tcp_outflags[tp->t_state];
-
-	DEBUG_MISC(" --- tcp_output flags = 0x%x", flags);
-
-	/*
-	 * If in persist timeout with window of 0, send 1 byte.
-	 * Otherwise, if window is small but nonzero
-	 * and timer expired, we will send what we can
-	 * and go to transmit state.
-	 */
-	if (tp->t_force) {
-		if (win == 0) {
-			/*
-			 * If we still have some data to send, then
-			 * clear the FIN bit.  Usually this would
-			 * happen below when it realizes that we
-			 * aren't sending all the data.  However,
-			 * if we have exactly 1 byte of unset data,
-			 * then it won't clear the FIN bit below,
-			 * and if we are in persist state, we wind
-			 * up sending the packet without recording
-			 * that we sent the FIN bit.
-			 *
-			 * We can't just blindly clear the FIN bit,
-			 * because if we don't have any more data
-			 * to send then the probe will be the FIN
-			 * itself.
-			 */
-			if (off < so->so_snd.sb_cc)
-				flags &= ~TH_FIN;
-			win = 1;
-		} else {
-			tp->t_timer[TCPT_PERSIST] = 0;
-			tp->t_rxtshift = 0;
-		}
-	}
-
-        len = MIN(so->so_snd.sb_cc, win) - off;
-
-	if (len < 0) {
-		/*
-		 * If FIN has been sent but not acked,
-		 * but we haven't been called to retransmit,
-		 * len will be -1.  Otherwise, window shrank
-		 * after we sent into it.  If window shrank to 0,
-		 * cancel pending retransmit and pull snd_nxt
-		 * back to (closed) window.  We will enter persist
-		 * state below.  If the window didn't close completely,
-		 * just wait for an ACK.
-		 */
-		len = 0;
-		if (win == 0) {
-			tp->t_timer[TCPT_REXMT] = 0;
-			tp->snd_nxt = tp->snd_una;
-		}
-	}
-
-	if (len > tp->t_maxseg) {
-		len = tp->t_maxseg;
-		sendalot = 1;
-	}
-	if (SEQ_LT(tp->snd_nxt + len, tp->snd_una + so->so_snd.sb_cc))
-		flags &= ~TH_FIN;
-
-	win = sbspace(&so->so_rcv);
-
-	/*
-	 * Sender silly window avoidance.  If connection is idle
-	 * and can send all data, a maximum segment,
-	 * at least a maximum default-size segment do it,
-	 * or are forced, do it; otherwise don't bother.
-	 * If peer's buffer is tiny, then send
-	 * when window is at least half open.
-	 * If retransmitting (possibly after persist timer forced us
-	 * to send into a small window), then must resend.
-	 */
-	if (len) {
-		if (len == tp->t_maxseg)
-			goto send;
-		if ((1 || idle || tp->t_flags & TF_NODELAY) &&
-		    len + off >= so->so_snd.sb_cc)
-			goto send;
-		if (tp->t_force)
-			goto send;
-		if (len >= tp->max_sndwnd / 2 && tp->max_sndwnd > 0)
-			goto send;
-		if (SEQ_LT(tp->snd_nxt, tp->snd_max))
-			goto send;
-	}
-
-	/*
-	 * Compare available window to amount of window
-	 * known to peer (as advertised window less
-	 * next expected input).  If the difference is at least two
-	 * max size segments, or at least 50% of the maximum possible
-	 * window, then want to send a window update to peer.
-	 */
-	if (win > 0) {
-		/*
-		 * "adv" is the amount we can increase the window,
-		 * taking into account that we are limited by
-		 * TCP_MAXWIN << tp->rcv_scale.
-		 */
-                long adv = MIN(win, (long)TCP_MAXWIN << tp->rcv_scale) -
-			(tp->rcv_adv - tp->rcv_nxt);
-
-		if (adv >= (long) (2 * tp->t_maxseg))
-			goto send;
-		if (2 * adv >= (long) so->so_rcv.sb_datalen)
-			goto send;
-	}
-
-	/*
-	 * Send if we owe peer an ACK.
-	 */
-	if (tp->t_flags & TF_ACKNOW)
-		goto send;
-	if (flags & (TH_SYN|TH_RST))
-		goto send;
-	if (SEQ_GT(tp->snd_up, tp->snd_una))
-		goto send;
-	/*
-	 * If our state indicates that FIN should be sent
-	 * and we have not yet done so, or we're retransmitting the FIN,
-	 * then we need to send.
-	 */
-	if (flags & TH_FIN &&
-	    ((tp->t_flags & TF_SENTFIN) == 0 || tp->snd_nxt == tp->snd_una))
-		goto send;
-
-	/*
-	 * TCP window updates are not reliable, rather a polling protocol
-	 * using ``persist'' packets is used to insure receipt of window
-	 * updates.  The three ``states'' for the output side are:
-	 *	idle			not doing retransmits or persists
-	 *	persisting		to move a small or zero window
-	 *	(re)transmitting	and thereby not persisting
-	 *
-	 * tp->t_timer[TCPT_PERSIST]
-	 *	is set when we are in persist state.
-	 * tp->t_force
-	 *	is set when we are called to send a persist packet.
-	 * tp->t_timer[TCPT_REXMT]
-	 *	is set when we are retransmitting
-	 * The output side is idle when both timers are zero.
-	 *
-	 * If send window is too small, there is data to transmit, and no
-	 * retransmit or persist is pending, then go to persist state.
-	 * If nothing happens soon, send when timer expires:
-	 * if window is nonzero, transmit what we can,
-	 * otherwise force out a byte.
-	 */
-	if (so->so_snd.sb_cc && tp->t_timer[TCPT_REXMT] == 0 &&
-	    tp->t_timer[TCPT_PERSIST] == 0) {
-		tp->t_rxtshift = 0;
-		tcp_setpersist(tp);
-	}
-
-	/*
-	 * No reason to send a segment, just return.
-	 */
-	return (0);
-
-send:
-	/*
-	 * Before ESTABLISHED, force sending of initial options
-	 * unless TCP set not to do any options.
-	 * NOTE: we assume that the IP/TCP header plus TCP options
-	 * always fit in a single mbuf, leaving room for a maximum
-	 * link header, i.e.
-	 *	max_linkhdr + sizeof (struct tcpiphdr) + optlen <= MHLEN
-	 */
-	optlen = 0;
-	hdrlen = sizeof (struct tcpiphdr);
-	if (flags & TH_SYN) {
-		tp->snd_nxt = tp->iss;
-		if ((tp->t_flags & TF_NOOPT) == 0) {
-			uint16_t mss;
-
-			opt[0] = TCPOPT_MAXSEG;
-			opt[1] = 4;
-			mss = htons((uint16_t) tcp_mss(tp, 0));
-			memcpy((char *)(opt + 2), (char *)&mss, sizeof(mss));
-			optlen = 4;
-		}
-	}
-
-	hdrlen += optlen;
-
-	/*
-	 * Adjust data length if insertion of options will
-	 * bump the packet length beyond the t_maxseg length.
-	 */
-	 if (len > tp->t_maxseg - optlen) {
-		len = tp->t_maxseg - optlen;
-		sendalot = 1;
-	 }
-
-	/*
-	 * Grab a header mbuf, attaching a copy of data to
-	 * be transmitted, and initialize the header from
-	 * the template for sends on this connection.
-	 */
-	if (len) {
-		m = m_get(so->slirp);
-		if (m == NULL) {
-			error = 1;
-			goto out;
-		}
-		m->m_data += IF_MAXLINKHDR;
-		m->m_len = hdrlen;
-
-		sbcopy(&so->so_snd, off, (int) len, mtod(m, char *) + hdrlen);
-		m->m_len += len;
-
-		/*
-		 * If we're sending everything we've got, set PUSH.
-		 * (This will keep happy those implementations which only
-		 * give data to the user when a buffer fills or
-		 * a PUSH comes in.)
-		 */
-		if (off + len == so->so_snd.sb_cc)
-			flags |= TH_PUSH;
-	} else {
-		m = m_get(so->slirp);
-		if (m == NULL) {
-			error = 1;
-			goto out;
-		}
-		m->m_data += IF_MAXLINKHDR;
-		m->m_len = hdrlen;
-	}
-
-	ti = mtod(m, struct tcpiphdr *);
-
-	memcpy((char *)ti, &tp->t_template, sizeof (struct tcpiphdr));
-
-	/*
-	 * Fill in fields, remembering maximum advertised
-	 * window for use in delaying messages about window sizes.
-	 * If resending a FIN, be sure not to use a new sequence number.
-	 */
-	if (flags & TH_FIN && tp->t_flags & TF_SENTFIN &&
-	    tp->snd_nxt == tp->snd_max)
-		tp->snd_nxt--;
-	/*
-	 * If we are doing retransmissions, then snd_nxt will
-	 * not reflect the first unsent octet.  For ACK only
-	 * packets, we do not want the sequence number of the
-	 * retransmitted packet, we want the sequence number
-	 * of the next unsent octet.  So, if there is no data
-	 * (and no SYN or FIN), use snd_max instead of snd_nxt
-	 * when filling in ti_seq.  But if we are in persist
-	 * state, snd_max might reflect one byte beyond the
-	 * right edge of the window, so use snd_nxt in that
-	 * case, since we know we aren't doing a retransmission.
-	 * (retransmit and persist are mutually exclusive...)
-	 */
-	if (len || (flags & (TH_SYN|TH_FIN)) || tp->t_timer[TCPT_PERSIST])
-		ti->ti_seq = htonl(tp->snd_nxt);
-	else
-		ti->ti_seq = htonl(tp->snd_max);
-	ti->ti_ack = htonl(tp->rcv_nxt);
-	if (optlen) {
-		memcpy((char *)(ti + 1), (char *)opt, optlen);
-		ti->ti_off = (sizeof (struct tcphdr) + optlen) >> 2;
-	}
-	ti->ti_flags = flags;
-	/*
-	 * Calculate receive window.  Don't shrink window,
-	 * but avoid silly window syndrome.
-	 */
-	if (win < (long)(so->so_rcv.sb_datalen / 4) && win < (long)tp->t_maxseg)
-		win = 0;
-	if (win > (long)TCP_MAXWIN << tp->rcv_scale)
-		win = (long)TCP_MAXWIN << tp->rcv_scale;
-	if (win < (long)(tp->rcv_adv - tp->rcv_nxt))
-		win = (long)(tp->rcv_adv - tp->rcv_nxt);
-	ti->ti_win = htons((uint16_t) (win>>tp->rcv_scale));
-
-	if (SEQ_GT(tp->snd_up, tp->snd_una)) {
-		ti->ti_urp = htons((uint16_t)(tp->snd_up - ntohl(ti->ti_seq)));
-		ti->ti_flags |= TH_URG;
-	} else
-		/*
-		 * If no urgent pointer to send, then we pull
-		 * the urgent pointer to the left edge of the send window
-		 * so that it doesn't drift into the send window on sequence
-		 * number wraparound.
-		 */
-		tp->snd_up = tp->snd_una;		/* drag it along */
-
-	/*
-	 * Put TCP length in extended header, and then
-	 * checksum extended header and data.
-	 */
-	if (len + optlen)
-		ti->ti_len = htons((uint16_t)(sizeof (struct tcphdr) +
-		    optlen + len));
-	ti->ti_sum = cksum(m, (int)(hdrlen + len));
-
-	/*
-	 * In transmit state, time the transmission and arrange for
-	 * the retransmit.  In persist state, just set snd_max.
-	 */
-	if (tp->t_force == 0 || tp->t_timer[TCPT_PERSIST] == 0) {
-		tcp_seq startseq = tp->snd_nxt;
-
-		/*
-		 * Advance snd_nxt over sequence space of this segment.
-		 */
-		if (flags & (TH_SYN|TH_FIN)) {
-			if (flags & TH_SYN)
-				tp->snd_nxt++;
-			if (flags & TH_FIN) {
-				tp->snd_nxt++;
-				tp->t_flags |= TF_SENTFIN;
-			}
-		}
-		tp->snd_nxt += len;
-		if (SEQ_GT(tp->snd_nxt, tp->snd_max)) {
-			tp->snd_max = tp->snd_nxt;
-			/*
-			 * Time this transmission if not a retransmission and
-			 * not currently timing anything.
-			 */
-			if (tp->t_rtt == 0) {
-				tp->t_rtt = 1;
-				tp->t_rtseq = startseq;
-			}
-		}
-
-		/*
-		 * Set retransmit timer if not currently set,
-		 * and not doing an ack or a keep-alive probe.
-		 * Initial value for retransmit timer is smoothed
-		 * round-trip time + 2 * round-trip time variance.
-		 * Initialize shift counter which is used for backoff
-		 * of retransmit time.
-		 */
-		if (tp->t_timer[TCPT_REXMT] == 0 &&
-		    tp->snd_nxt != tp->snd_una) {
-			tp->t_timer[TCPT_REXMT] = tp->t_rxtcur;
-			if (tp->t_timer[TCPT_PERSIST]) {
-				tp->t_timer[TCPT_PERSIST] = 0;
-				tp->t_rxtshift = 0;
-			}
-		}
-	} else
-		if (SEQ_GT(tp->snd_nxt + len, tp->snd_max))
-			tp->snd_max = tp->snd_nxt + len;
-
-	/*
-	 * Fill in IP length and desired time to live and
-	 * send to IP level.  There should be a better way
-	 * to handle ttl and tos; we could keep them in
-	 * the template, but need a way to checksum without them.
-	 */
-	m->m_len = hdrlen + len; /* XXX Needed? m_len should be correct */
-	tcpiph_save = *mtod(m, struct tcpiphdr *);
-
-	switch (so->so_ffamily) {
-	case AF_INET:
-	    m->m_data += sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
-	                                         - sizeof(struct ip);
-	    m->m_len  -= sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
-	                                         - sizeof(struct ip);
-	    ip = mtod(m, struct ip *);
-
-	    ip->ip_len = m->m_len;
-	    ip->ip_dst = tcpiph_save.ti_dst;
-	    ip->ip_src = tcpiph_save.ti_src;
-	    ip->ip_p = tcpiph_save.ti_pr;
-
-	    ip->ip_ttl = IPDEFTTL;
-	    ip->ip_tos = so->so_iptos;
-	    error = ip_output(so, m);
-	    break;
-
-	case AF_INET6:
-	    m->m_data += sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
-	                                         - sizeof(struct ip6);
-	    m->m_len  -= sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
-	                                         - sizeof(struct ip6);
-	    ip6 = mtod(m, struct ip6 *);
-
-	    ip6->ip_pl = tcpiph_save.ti_len;
-	    ip6->ip_dst = tcpiph_save.ti_dst6;
-	    ip6->ip_src = tcpiph_save.ti_src6;
-	    ip6->ip_nh = tcpiph_save.ti_nh6;
-
-	    error = ip6_output(so, m, 0);
-	    break;
-
-	default:
-	    g_assert_not_reached();
-	}
-
-	if (error) {
-out:
-		return (error);
-	}
-
-	/*
-	 * Data sent (as far as we can tell).
-	 * If this advertises a larger window than any other segment,
-	 * then remember the size of the advertised window.
-	 * Any pending ACK has now been sent.
-	 */
-	if (win > 0 && SEQ_GT(tp->rcv_nxt+win, tp->rcv_adv))
-		tp->rcv_adv = tp->rcv_nxt + win;
-	tp->last_ack_sent = tp->rcv_nxt;
-	tp->t_flags &= ~(TF_ACKNOW|TF_DELACK);
-	if (sendalot)
-		goto again;
-
-	return (0);
-}
-
-void
-tcp_setpersist(struct tcpcb *tp)
-{
-    int t = ((tp->t_srtt >> 2) + tp->t_rttvar) >> 1;
-
-	/*
-	 * Start/restart persistence timer.
-	 */
-	TCPT_RANGESET(tp->t_timer[TCPT_PERSIST],
-	    t * tcp_backoff[tp->t_rxtshift],
-	    TCPTV_PERSMIN, TCPTV_PERSMAX);
-	if (tp->t_rxtshift < TCP_MAXRXTSHIFT)
-		tp->t_rxtshift++;
-}
diff --git a/slirp/src/tcp_subr.c b/slirp/src/tcp_subr.c
deleted file mode 100644
index fde9207..0000000
--- a/slirp/src/tcp_subr.c
+++ /dev/null
@@ -1,987 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1982, 1986, 1988, 1990, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)tcp_subr.c	8.1 (Berkeley) 6/10/93
- * tcp_subr.c,v 1.5 1994/10/08 22:39:58 phk Exp
- */
-
-/*
- * Changes and additions relating to SLiRP
- * Copyright (c) 1995 Danny Gasparovski.
- */
-
-#include "slirp.h"
-
-/* patchable/settable parameters for tcp */
-/* Don't do rfc1323 performance enhancements */
-#define TCP_DO_RFC1323 0
-
-/*
- * Tcp initialization
- */
-void
-tcp_init(Slirp *slirp)
-{
-    slirp->tcp_iss = 1;		/* wrong */
-    slirp->tcb.so_next = slirp->tcb.so_prev = &slirp->tcb;
-    slirp->tcp_last_so = &slirp->tcb;
-}
-
-void tcp_cleanup(Slirp *slirp)
-{
-    while (slirp->tcb.so_next != &slirp->tcb) {
-        tcp_close(sototcpcb(slirp->tcb.so_next));
-    }
-}
-
-/*
- * Create template to be used to send tcp packets on a connection.
- * Call after host entry created, fills
- * in a skeletal tcp/ip header, minimizing the amount of work
- * necessary when the connection is used.
- */
-void
-tcp_template(struct tcpcb *tp)
-{
-	struct socket *so = tp->t_socket;
-	register struct tcpiphdr *n = &tp->t_template;
-
-	n->ti_mbuf = NULL;
-	memset(&n->ti, 0, sizeof(n->ti));
-	n->ti_x0 = 0;
-	switch (so->so_ffamily) {
-	case AF_INET:
-	    n->ti_pr = IPPROTO_TCP;
-	    n->ti_len = htons(sizeof(struct tcphdr));
-	    n->ti_src = so->so_faddr;
-	    n->ti_dst = so->so_laddr;
-	    n->ti_sport = so->so_fport;
-	    n->ti_dport = so->so_lport;
-	    break;
-
-	case AF_INET6:
-	    n->ti_nh6 = IPPROTO_TCP;
-	    n->ti_len = htons(sizeof(struct tcphdr));
-	    n->ti_src6 = so->so_faddr6;
-	    n->ti_dst6 = so->so_laddr6;
-	    n->ti_sport = so->so_fport6;
-	    n->ti_dport = so->so_lport6;
-	    break;
-
-	default:
-	    g_assert_not_reached();
-	}
-
-	n->ti_seq = 0;
-	n->ti_ack = 0;
-	n->ti_x2 = 0;
-	n->ti_off = 5;
-	n->ti_flags = 0;
-	n->ti_win = 0;
-	n->ti_sum = 0;
-	n->ti_urp = 0;
-}
-
-/*
- * Send a single message to the TCP at address specified by
- * the given TCP/IP header.  If m == 0, then we make a copy
- * of the tcpiphdr at ti and send directly to the addressed host.
- * This is used to force keep alive messages out using the TCP
- * template for a connection tp->t_template.  If flags are given
- * then we send a message back to the TCP which originated the
- * segment ti, and discard the mbuf containing it and any other
- * attached mbufs.
- *
- * In any case the ack and sequence number of the transmitted
- * segment are as specified by the parameters.
- */
-void
-tcp_respond(struct tcpcb *tp, struct tcpiphdr *ti, struct mbuf *m,
-            tcp_seq ack, tcp_seq seq, int flags, unsigned short af)
-{
-	register int tlen;
-	int win = 0;
-
-	DEBUG_CALL("tcp_respond");
-	DEBUG_ARG("tp = %p", tp);
-	DEBUG_ARG("ti = %p", ti);
-	DEBUG_ARG("m = %p", m);
-	DEBUG_ARG("ack = %u", ack);
-	DEBUG_ARG("seq = %u", seq);
-	DEBUG_ARG("flags = %x", flags);
-
-	if (tp)
-		win = sbspace(&tp->t_socket->so_rcv);
-        if (m == NULL) {
-		if (!tp || (m = m_get(tp->t_socket->slirp)) == NULL)
-			return;
-		tlen = 0;
-		m->m_data += IF_MAXLINKHDR;
-		*mtod(m, struct tcpiphdr *) = *ti;
-		ti = mtod(m, struct tcpiphdr *);
-		switch (af) {
-		case AF_INET:
-		    ti->ti.ti_i4.ih_x1 = 0;
-		    break;
-		case AF_INET6:
-		    ti->ti.ti_i6.ih_x1 = 0;
-		    break;
-		default:
-		    g_assert_not_reached();
-		}
-		flags = TH_ACK;
-	} else {
-		/*
-		 * ti points into m so the next line is just making
-		 * the mbuf point to ti
-		 */
-		m->m_data = (char *)ti;
-
-		m->m_len = sizeof (struct tcpiphdr);
-		tlen = 0;
-#define xchg(a,b,type) { type t; t=a; a=b; b=t; }
-		switch (af) {
-		case AF_INET:
-		    xchg(ti->ti_dst.s_addr, ti->ti_src.s_addr, uint32_t);
-		    xchg(ti->ti_dport, ti->ti_sport, uint16_t);
-		    break;
-		case AF_INET6:
-		    xchg(ti->ti_dst6, ti->ti_src6, struct in6_addr);
-		    xchg(ti->ti_dport, ti->ti_sport, uint16_t);
-		    break;
-		default:
-		    g_assert_not_reached();
-		}
-#undef xchg
-	}
-	ti->ti_len = htons((uint16_t)(sizeof (struct tcphdr) + tlen));
-	tlen += sizeof (struct tcpiphdr);
-	m->m_len = tlen;
-
-	ti->ti_mbuf = NULL;
-	ti->ti_x0 = 0;
-	ti->ti_seq = htonl(seq);
-	ti->ti_ack = htonl(ack);
-	ti->ti_x2 = 0;
-	ti->ti_off = sizeof (struct tcphdr) >> 2;
-	ti->ti_flags = flags;
-	if (tp)
-		ti->ti_win = htons((uint16_t) (win >> tp->rcv_scale));
-	else
-		ti->ti_win = htons((uint16_t)win);
-	ti->ti_urp = 0;
-	ti->ti_sum = 0;
-	ti->ti_sum = cksum(m, tlen);
-
-	struct tcpiphdr tcpiph_save = *(mtod(m, struct tcpiphdr *));
-	struct ip *ip;
-	struct ip6 *ip6;
-
-	switch (af) {
-	case AF_INET:
-	    m->m_data += sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
-	                                         - sizeof(struct ip);
-	    m->m_len  -= sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
-	                                         - sizeof(struct ip);
-	    ip = mtod(m, struct ip *);
-	    ip->ip_len = m->m_len;
-	    ip->ip_dst = tcpiph_save.ti_dst;
-	    ip->ip_src = tcpiph_save.ti_src;
-	    ip->ip_p = tcpiph_save.ti_pr;
-
-	    if (flags & TH_RST) {
-	        ip->ip_ttl = MAXTTL;
-	    } else {
-	        ip->ip_ttl = IPDEFTTL;
-	    }
-
-	    ip_output(NULL, m);
-	    break;
-
-	case AF_INET6:
-	    m->m_data += sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
-	                                         - sizeof(struct ip6);
-	    m->m_len  -= sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
-	                                         - sizeof(struct ip6);
-	    ip6 = mtod(m, struct ip6 *);
-	    ip6->ip_pl = tcpiph_save.ti_len;
-	    ip6->ip_dst = tcpiph_save.ti_dst6;
-	    ip6->ip_src = tcpiph_save.ti_src6;
-	    ip6->ip_nh = tcpiph_save.ti_nh6;
-
-	    ip6_output(NULL, m, 0);
-	    break;
-
-	default:
-	    g_assert_not_reached();
-	}
-}
-
-/*
- * Create a new TCP control block, making an
- * empty reassembly queue and hooking it to the argument
- * protocol control block.
- */
-struct tcpcb *
-tcp_newtcpcb(struct socket *so)
-{
-	register struct tcpcb *tp;
-
-	tp = (struct tcpcb *)malloc(sizeof(*tp));
-	if (tp == NULL)
-		return ((struct tcpcb *)0);
-
-	memset((char *) tp, 0, sizeof(struct tcpcb));
-	tp->seg_next = tp->seg_prev = (struct tcpiphdr*)tp;
-	tp->t_maxseg = (so->so_ffamily == AF_INET) ? TCP_MSS : TCP6_MSS;
-
-	tp->t_flags = TCP_DO_RFC1323 ? (TF_REQ_SCALE|TF_REQ_TSTMP) : 0;
-	tp->t_socket = so;
-
-	/*
-	 * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
-	 * rtt estimate.  Set rttvar so that srtt + 2 * rttvar gives
-	 * reasonable initial retransmit time.
-	 */
-	tp->t_srtt = TCPTV_SRTTBASE;
-	tp->t_rttvar = TCPTV_SRTTDFLT << 2;
-	tp->t_rttmin = TCPTV_MIN;
-
-	TCPT_RANGESET(tp->t_rxtcur,
-	    ((TCPTV_SRTTBASE >> 2) + (TCPTV_SRTTDFLT << 2)) >> 1,
-	    TCPTV_MIN, TCPTV_REXMTMAX);
-
-	tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
-	tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
-	tp->t_state = TCPS_CLOSED;
-
-	so->so_tcpcb = tp;
-
-	return (tp);
-}
-
-/*
- * Drop a TCP connection, reporting
- * the specified error.  If connection is synchronized,
- * then send a RST to peer.
- */
-struct tcpcb *tcp_drop(struct tcpcb *tp, int err)
-{
-	DEBUG_CALL("tcp_drop");
-	DEBUG_ARG("tp = %p", tp);
-	DEBUG_ARG("errno = %d", errno);
-
-	if (TCPS_HAVERCVDSYN(tp->t_state)) {
-		tp->t_state = TCPS_CLOSED;
-		(void) tcp_output(tp);
-	}
-	return (tcp_close(tp));
-}
-
-/*
- * Close a TCP control block:
- *	discard all space held by the tcp
- *	discard internet protocol block
- *	wake up any sleepers
- */
-struct tcpcb *
-tcp_close(struct tcpcb *tp)
-{
-	register struct tcpiphdr *t;
-	struct socket *so = tp->t_socket;
-	Slirp *slirp = so->slirp;
-	register struct mbuf *m;
-
-	DEBUG_CALL("tcp_close");
-	DEBUG_ARG("tp = %p", tp);
-
-	/* free the reassembly queue, if any */
-	t = tcpfrag_list_first(tp);
-	while (!tcpfrag_list_end(t, tp)) {
-		t = tcpiphdr_next(t);
-		m = tcpiphdr_prev(t)->ti_mbuf;
-		remque(tcpiphdr2qlink(tcpiphdr_prev(t)));
-		m_free(m);
-	}
-	free(tp);
-        so->so_tcpcb = NULL;
-	/* clobber input socket cache if we're closing the cached connection */
-	if (so == slirp->tcp_last_so)
-		slirp->tcp_last_so = &slirp->tcb;
-	so->slirp->cb->unregister_poll_fd(so->s, so->slirp->opaque);
-	closesocket(so->s);
-	sbfree(&so->so_rcv);
-	sbfree(&so->so_snd);
-	sofree(so);
-	return ((struct tcpcb *)0);
-}
-
-/*
- * TCP protocol interface to socket abstraction.
- */
-
-/*
- * User issued close, and wish to trail through shutdown states:
- * if never received SYN, just forget it.  If got a SYN from peer,
- * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
- * If already got a FIN from peer, then almost done; go to LAST_ACK
- * state.  In all other cases, have already sent FIN to peer (e.g.
- * after PRU_SHUTDOWN), and just have to play tedious game waiting
- * for peer to send FIN or not respond to keep-alives, etc.
- * We can let the user exit from the close as soon as the FIN is acked.
- */
-void
-tcp_sockclosed(struct tcpcb *tp)
-{
-
-	DEBUG_CALL("tcp_sockclosed");
-	DEBUG_ARG("tp = %p", tp);
-
-	if (!tp) {
-		return;
-	}
-
-	switch (tp->t_state) {
-
-	case TCPS_CLOSED:
-	case TCPS_LISTEN:
-	case TCPS_SYN_SENT:
-		tp->t_state = TCPS_CLOSED;
-		tp = tcp_close(tp);
-		break;
-
-	case TCPS_SYN_RECEIVED:
-	case TCPS_ESTABLISHED:
-		tp->t_state = TCPS_FIN_WAIT_1;
-		break;
-
-	case TCPS_CLOSE_WAIT:
-		tp->t_state = TCPS_LAST_ACK;
-		break;
-	}
-	tcp_output(tp);
-}
-
-/*
- * Connect to a host on the Internet
- * Called by tcp_input
- * Only do a connect, the tcp fields will be set in tcp_input
- * return 0 if there's a result of the connect,
- * else return -1 means we're still connecting
- * The return value is almost always -1 since the socket is
- * nonblocking.  Connect returns after the SYN is sent, and does
- * not wait for ACK+SYN.
- */
-int tcp_fconnect(struct socket *so, unsigned short af)
-{
-  int ret=0;
-
-  DEBUG_CALL("tcp_fconnect");
-  DEBUG_ARG("so = %p", so);
-
-  ret = so->s = slirp_socket(af, SOCK_STREAM, 0);
-  if (ret >= 0) {
-    int opt, s=so->s;
-    struct sockaddr_storage addr;
-
-    slirp_set_nonblock(s);
-    so->slirp->cb->register_poll_fd(so->s, so->slirp->opaque);
-    slirp_socket_set_fast_reuse(s);
-    opt = 1;
-    setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(opt));
-    opt = 1;
-    setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt));
-
-    addr = so->fhost.ss;
-    DEBUG_CALL(" connect()ing");
-    sotranslate_out(so, &addr);
-
-    /* We don't care what port we get */
-    ret = connect(s, (struct sockaddr *)&addr, sockaddr_size(&addr));
-
-    /*
-     * If it's not in progress, it failed, so we just return 0,
-     * without clearing SS_NOFDREF
-     */
-    soisfconnecting(so);
-  }
-
-  return(ret);
-}
-
-/*
- * Accept the socket and connect to the local-host
- *
- * We have a problem. The correct thing to do would be
- * to first connect to the local-host, and only if the
- * connection is accepted, then do an accept() here.
- * But, a) we need to know who's trying to connect
- * to the socket to be able to SYN the local-host, and
- * b) we are already connected to the foreign host by
- * the time it gets to accept(), so... We simply accept
- * here and SYN the local-host.
- */
-void tcp_connect(struct socket *inso)
-{
-    Slirp *slirp = inso->slirp;
-    struct socket *so;
-    struct sockaddr_storage addr;
-    socklen_t addrlen = sizeof(struct sockaddr_storage);
-    struct tcpcb *tp;
-    int s, opt;
-
-    DEBUG_CALL("tcp_connect");
-    DEBUG_ARG("inso = %p", inso);
-
-    /*
-     * If it's an SS_ACCEPTONCE socket, no need to socreate()
-     * another socket, just use the accept() socket.
-     */
-    if (inso->so_state & SS_FACCEPTONCE) {
-        /* FACCEPTONCE already have a tcpcb */
-        so = inso;
-    } else {
-        so = socreate(slirp);
-        if (tcp_attach(so) < 0) {
-            g_free(so); /* NOT sofree */
-            return;
-        }
-        so->lhost = inso->lhost;
-        so->so_ffamily = inso->so_ffamily;
-    }
-
-    tcp_mss(sototcpcb(so), 0);
-
-    s = accept(inso->s, (struct sockaddr *)&addr, &addrlen);
-    if (s < 0) {
-        tcp_close(sototcpcb(so)); /* This will sofree() as well */
-        return;
-    }
-    slirp_set_nonblock(s);
-    so->slirp->cb->register_poll_fd(so->s, so->slirp->opaque);
-    slirp_socket_set_fast_reuse(s);
-    opt = 1;
-    setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int));
-    slirp_socket_set_nodelay(s);
-
-    so->fhost.ss = addr;
-    sotranslate_accept(so);
-
-    /* Close the accept() socket, set right state */
-    if (inso->so_state & SS_FACCEPTONCE) {
-        /* If we only accept once, close the accept() socket */
-        so->slirp->cb->unregister_poll_fd(so->s, so->slirp->opaque);
-        closesocket(so->s);
-
-        /* Don't select it yet, even though we have an FD */
-        /* if it's not FACCEPTONCE, it's already NOFDREF */
-        so->so_state = SS_NOFDREF;
-    }
-    so->s = s;
-    so->so_state |= SS_INCOMING;
-
-    so->so_iptos = tcp_tos(so);
-    tp = sototcpcb(so);
-
-    tcp_template(tp);
-
-    tp->t_state = TCPS_SYN_SENT;
-    tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
-    tp->iss = slirp->tcp_iss;
-    slirp->tcp_iss += TCP_ISSINCR/2;
-    tcp_sendseqinit(tp);
-    tcp_output(tp);
-}
-
-/*
- * Attach a TCPCB to a socket.
- */
-int
-tcp_attach(struct socket *so)
-{
-	if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL)
-	   return -1;
-
-	insque(so, &so->slirp->tcb);
-
-	return 0;
-}
-
-/*
- * Set the socket's type of service field
- */
-static const struct tos_t tcptos[] = {
-	  {0, 20, IPTOS_THROUGHPUT, 0},	/* ftp data */
-	  {21, 21, IPTOS_LOWDELAY,  EMU_FTP},	/* ftp control */
-	  {0, 23, IPTOS_LOWDELAY, 0},	/* telnet */
-	  {0, 80, IPTOS_THROUGHPUT, 0},	/* WWW */
-	  {0, 513, IPTOS_LOWDELAY, EMU_RLOGIN|EMU_NOCONNECT},	/* rlogin */
-	  {0, 544, IPTOS_LOWDELAY, EMU_KSH},		/* kshell */
-	  {0, 543, IPTOS_LOWDELAY, 0},	/* klogin */
-	  {0, 6667, IPTOS_THROUGHPUT, EMU_IRC},	/* IRC */
-	  {0, 6668, IPTOS_THROUGHPUT, EMU_IRC},	/* IRC undernet */
-	  {0, 7070, IPTOS_LOWDELAY, EMU_REALAUDIO }, /* RealAudio control */
-	  {0, 113, IPTOS_LOWDELAY, EMU_IDENT }, /* identd protocol */
-	  {0, 0, 0, 0}
-};
-
-static struct emu_t *tcpemu = NULL;
-
-/*
- * Return TOS according to the above table
- */
-uint8_t
-tcp_tos(struct socket *so)
-{
-	int i = 0;
-	struct emu_t *emup;
-
-	while(tcptos[i].tos) {
-		if ((tcptos[i].fport && (ntohs(so->so_fport) == tcptos[i].fport)) ||
-		    (tcptos[i].lport && (ntohs(so->so_lport) == tcptos[i].lport))) {
-			so->so_emu = tcptos[i].emu;
-			return tcptos[i].tos;
-		}
-		i++;
-	}
-
-	/* Nope, lets see if there's a user-added one */
-	for (emup = tcpemu; emup; emup = emup->next) {
-		if ((emup->fport && (ntohs(so->so_fport) == emup->fport)) ||
-		    (emup->lport && (ntohs(so->so_lport) == emup->lport))) {
-			so->so_emu = emup->emu;
-			return emup->tos;
-		}
-	}
-
-	return 0;
-}
-
-/*
- * Emulate programs that try and connect to us
- * This includes ftp (the data connection is
- * initiated by the server) and IRC (DCC CHAT and
- * DCC SEND) for now
- *
- * NOTE: It's possible to crash SLiRP by sending it
- * unstandard strings to emulate... if this is a problem,
- * more checks are needed here
- *
- * XXX Assumes the whole command came in one packet
- *
- * XXX Some ftp clients will have their TOS set to
- * LOWDELAY and so Nagel will kick in.  Because of this,
- * we'll get the first letter, followed by the rest, so
- * we simply scan for ORT instead of PORT...
- * DCC doesn't have this problem because there's other stuff
- * in the packet before the DCC command.
- *
- * Return 1 if the mbuf m is still valid and should be
- * sbappend()ed
- *
- * NOTE: if you return 0 you MUST m_free() the mbuf!
- */
-int
-tcp_emu(struct socket *so, struct mbuf *m)
-{
-	Slirp *slirp = so->slirp;
-	unsigned n1, n2, n3, n4, n5, n6;
-        char buff[257];
-	uint32_t laddr;
-	unsigned lport;
-	char *bptr;
-
-	DEBUG_CALL("tcp_emu");
-	DEBUG_ARG("so = %p", so);
-	DEBUG_ARG("m = %p", m);
-
-	switch(so->so_emu) {
-		int x, i;
-
-        /* TODO: IPv6 */
-	 case EMU_IDENT:
-		/*
-		 * Identification protocol as per rfc-1413
-		 */
-
-		{
-			struct socket *tmpso;
-			struct sockaddr_in addr;
-			socklen_t addrlen = sizeof(struct sockaddr_in);
-			struct sbuf *so_rcv = &so->so_rcv;
-
-			if (m->m_len > so_rcv->sb_datalen
-					- (so_rcv->sb_wptr - so_rcv->sb_data)) {
-			    return 1;
-			}
-
-			memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
-			so_rcv->sb_wptr += m->m_len;
-			so_rcv->sb_rptr += m->m_len;
-			m->m_data[m->m_len] = 0; /* NULL terminate */
-			if (strchr(m->m_data, '\r') || strchr(m->m_data, '\n')) {
-				if (sscanf(so_rcv->sb_data, "%u%*[ ,]%u", &n1, &n2) == 2) {
-					HTONS(n1);
-					HTONS(n2);
-					/* n2 is the one on our host */
-					for (tmpso = slirp->tcb.so_next;
-					     tmpso != &slirp->tcb;
-					     tmpso = tmpso->so_next) {
-						if (tmpso->so_laddr.s_addr == so->so_laddr.s_addr &&
-						    tmpso->so_lport == n2 &&
-						    tmpso->so_faddr.s_addr == so->so_faddr.s_addr &&
-						    tmpso->so_fport == n1) {
-							if (getsockname(tmpso->s,
-								(struct sockaddr *)&addr, &addrlen) == 0)
-							   n2 = addr.sin_port;
-							break;
-						}
-					}
-					NTOHS(n1);
-					NTOHS(n2);
-					so_rcv->sb_cc = snprintf(so_rcv->sb_data,
-								 so_rcv->sb_datalen,
-								 "%d,%d\r\n", n1, n2);
-					so_rcv->sb_rptr = so_rcv->sb_data;
-					so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
-				}
-			}
-			m_free(m);
-			return 0;
-		}
-
-        case EMU_FTP: /* ftp */
-                *(m->m_data+m->m_len) = 0; /* NUL terminate for strstr */
-		if ((bptr = (char *)strstr(m->m_data, "ORT")) != NULL) {
-			/*
-			 * Need to emulate the PORT command
-			 */
-			x = sscanf(bptr, "ORT %u,%u,%u,%u,%u,%u\r\n%256[^\177]",
-				   &n1, &n2, &n3, &n4, &n5, &n6, buff);
-			if (x < 6)
-			   return 1;
-
-			laddr = htonl((n1 << 24) | (n2 << 16) | (n3 << 8) | (n4));
-			lport = htons((n5 << 8) | (n6));
-
-			if ((so = tcp_listen(slirp, INADDR_ANY, 0, laddr,
-			                     lport, SS_FACCEPTONCE)) == NULL) {
-			   return 1;
-			}
-			n6 = ntohs(so->so_fport);
-
-			n5 = (n6 >> 8) & 0xff;
-			n6 &= 0xff;
-
-			laddr = ntohl(so->so_faddr.s_addr);
-
-			n1 = ((laddr >> 24) & 0xff);
-			n2 = ((laddr >> 16) & 0xff);
-			n3 = ((laddr >> 8)  & 0xff);
-			n4 =  (laddr & 0xff);
-
-			m->m_len = bptr - m->m_data; /* Adjust length */
-                        m->m_len += snprintf(bptr, m->m_size - m->m_len,
-                                             "ORT %d,%d,%d,%d,%d,%d\r\n%s",
-                                             n1, n2, n3, n4, n5, n6, x==7?buff:"");
-			return 1;
-		} else if ((bptr = (char *)strstr(m->m_data, "27 Entering")) != NULL) {
-			/*
-			 * Need to emulate the PASV response
-			 */
-			x = sscanf(bptr, "27 Entering Passive Mode (%u,%u,%u,%u,%u,%u)\r\n%256[^\177]",
-				   &n1, &n2, &n3, &n4, &n5, &n6, buff);
-			if (x < 6)
-			   return 1;
-
-			laddr = htonl((n1 << 24) | (n2 << 16) | (n3 << 8) | (n4));
-			lport = htons((n5 << 8) | (n6));
-
-			if ((so = tcp_listen(slirp, INADDR_ANY, 0, laddr,
-			                     lport, SS_FACCEPTONCE)) == NULL) {
-			   return 1;
-			}
-			n6 = ntohs(so->so_fport);
-
-			n5 = (n6 >> 8) & 0xff;
-			n6 &= 0xff;
-
-			laddr = ntohl(so->so_faddr.s_addr);
-
-			n1 = ((laddr >> 24) & 0xff);
-			n2 = ((laddr >> 16) & 0xff);
-			n3 = ((laddr >> 8)  & 0xff);
-			n4 =  (laddr & 0xff);
-
-			m->m_len = bptr - m->m_data; /* Adjust length */
-			m->m_len += snprintf(bptr, m->m_size - m->m_len,
-                                             "27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%s",
-                                             n1, n2, n3, n4, n5, n6, x==7?buff:"");
-
-			return 1;
-		}
-
-		return 1;
-
-	 case EMU_KSH:
-		/*
-		 * The kshell (Kerberos rsh) and shell services both pass
-		 * a local port port number to carry signals to the server
-		 * and stderr to the client.  It is passed at the beginning
-		 * of the connection as a NUL-terminated decimal ASCII string.
-		 */
-		so->so_emu = 0;
-		for (lport = 0, i = 0; i < m->m_len-1; ++i) {
-			if (m->m_data[i] < '0' || m->m_data[i] > '9')
-				return 1;       /* invalid number */
-			lport *= 10;
-			lport += m->m_data[i] - '0';
-		}
-		if (m->m_data[m->m_len-1] == '\0' && lport != 0 &&
-		    (so = tcp_listen(slirp, INADDR_ANY, 0, so->so_laddr.s_addr,
-		                     htons(lport), SS_FACCEPTONCE)) != NULL)
-                    m->m_len = snprintf(m->m_data, m->m_size, "%d",
-                                        ntohs(so->so_fport)) + 1;
-		return 1;
-
-	 case EMU_IRC:
-		/*
-		 * Need to emulate DCC CHAT, DCC SEND and DCC MOVE
-		 */
-		*(m->m_data+m->m_len) = 0; /* NULL terminate the string for strstr */
-		if ((bptr = (char *)strstr(m->m_data, "DCC")) == NULL)
-			 return 1;
-
-		/* The %256s is for the broken mIRC */
-		if (sscanf(bptr, "DCC CHAT %256s %u %u", buff, &laddr, &lport) == 3) {
-			if ((so = tcp_listen(slirp, INADDR_ANY, 0,
-			                     htonl(laddr), htons(lport),
-			                     SS_FACCEPTONCE)) == NULL) {
-				return 1;
-			}
-			m->m_len = bptr - m->m_data; /* Adjust length */
-                        m->m_len += snprintf(bptr, m->m_size,
-                                             "DCC CHAT chat %lu %u%c\n",
-                                             (unsigned long)ntohl(so->so_faddr.s_addr),
-                                             ntohs(so->so_fport), 1);
-		} else if (sscanf(bptr, "DCC SEND %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
-			if ((so = tcp_listen(slirp, INADDR_ANY, 0,
-			                     htonl(laddr), htons(lport),
-			                     SS_FACCEPTONCE)) == NULL) {
-				return 1;
-			}
-			m->m_len = bptr - m->m_data; /* Adjust length */
-                        m->m_len += snprintf(bptr, m->m_size,
-                                             "DCC SEND %s %lu %u %u%c\n", buff,
-                                             (unsigned long)ntohl(so->so_faddr.s_addr),
-                                             ntohs(so->so_fport), n1, 1);
-		} else if (sscanf(bptr, "DCC MOVE %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
-			if ((so = tcp_listen(slirp, INADDR_ANY, 0,
-			                     htonl(laddr), htons(lport),
-			                     SS_FACCEPTONCE)) == NULL) {
-				return 1;
-			}
-			m->m_len = bptr - m->m_data; /* Adjust length */
-                        m->m_len += snprintf(bptr, m->m_size,
-                                             "DCC MOVE %s %lu %u %u%c\n", buff,
-                                             (unsigned long)ntohl(so->so_faddr.s_addr),
-                                             ntohs(so->so_fport), n1, 1);
-		}
-		return 1;
-
-	 case EMU_REALAUDIO:
-                /*
-		 * RealAudio emulation - JP. We must try to parse the incoming
-		 * data and try to find the two characters that contain the
-		 * port number. Then we redirect an udp port and replace the
-		 * number with the real port we got.
-		 *
-		 * The 1.0 beta versions of the player are not supported
-		 * any more.
-		 *
-		 * A typical packet for player version 1.0 (release version):
-		 *
-		 * 0000:50 4E 41 00 05
-		 * 0000:00 01 00 02 1B D7 00 00 67 E6 6C DC 63 00 12 50 ........g.l.c..P
-		 * 0010:4E 43 4C 49 45 4E 54 20 31 30 31 20 41 4C 50 48 NCLIENT 101 ALPH
-		 * 0020:41 6C 00 00 52 00 17 72 61 66 69 6C 65 73 2F 76 Al..R..rafiles/v
-		 * 0030:6F 61 2F 65 6E 67 6C 69 73 68 5F 2E 72 61 79 42 oa/english_.rayB
-		 *
-		 * Now the port number 0x1BD7 is found at offset 0x04 of the
-		 * Now the port number 0x1BD7 is found at offset 0x04 of the
-		 * second packet. This time we received five bytes first and
-		 * then the rest. You never know how many bytes you get.
-		 *
-		 * A typical packet for player version 2.0 (beta):
-		 *
-		 * 0000:50 4E 41 00 06 00 02 00 00 00 01 00 02 1B C1 00 PNA.............
-		 * 0010:00 67 75 78 F5 63 00 0A 57 69 6E 32 2E 30 2E 30 .gux.c..Win2.0.0
-		 * 0020:2E 35 6C 00 00 52 00 1C 72 61 66 69 6C 65 73 2F .5l..R..rafiles/
-		 * 0030:77 65 62 73 69 74 65 2F 32 30 72 65 6C 65 61 73 website/20releas
-		 * 0040:65 2E 72 61 79 53 00 00 06 36 42                e.rayS...6B
-		 *
-		 * Port number 0x1BC1 is found at offset 0x0d.
-		 *
-		 * This is just a horrible switch statement. Variable ra tells
-		 * us where we're going.
-		 */
-
-		bptr = m->m_data;
-		while (bptr < m->m_data + m->m_len) {
-			uint16_t p;
-			static int ra = 0;
-			char ra_tbl[4];
-
-			ra_tbl[0] = 0x50;
-			ra_tbl[1] = 0x4e;
-			ra_tbl[2] = 0x41;
-			ra_tbl[3] = 0;
-
-			switch (ra) {
-			 case 0:
-			 case 2:
-			 case 3:
-				if (*bptr++ != ra_tbl[ra]) {
-					ra = 0;
-					continue;
-				}
-				break;
-
-			 case 1:
-				/*
-				 * We may get 0x50 several times, ignore them
-				 */
-				if (*bptr == 0x50) {
-					ra = 1;
-					bptr++;
-					continue;
-				} else if (*bptr++ != ra_tbl[ra]) {
-					ra = 0;
-					continue;
-				}
-				break;
-
-			 case 4:
-				/*
-				 * skip version number
-				 */
-				bptr++;
-				break;
-
-			 case 5:
-				/*
-				 * The difference between versions 1.0 and
-				 * 2.0 is here. For future versions of
-				 * the player this may need to be modified.
-				 */
-				if (*(bptr + 1) == 0x02)
-				   bptr += 8;
-				else
-				   bptr += 4;
-				break;
-
-			 case 6:
-				/* This is the field containing the port
-				 * number that RA-player is listening to.
-				 */
-				lport = (((uint8_t*)bptr)[0] << 8)
-				+ ((uint8_t *)bptr)[1];
-				if (lport < 6970)
-				   lport += 256;   /* don't know why */
-				if (lport < 6970 || lport > 7170)
-				   return 1;       /* failed */
-
-				/* try to get udp port between 6970 - 7170 */
-				for (p = 6970; p < 7071; p++) {
-					if (udp_listen(slirp, INADDR_ANY,
-						       htons(p),
-						       so->so_laddr.s_addr,
-						       htons(lport),
-						       SS_FACCEPTONCE)) {
-						break;
-					}
-				}
-				if (p == 7071)
-				   p = 0;
-				*(uint8_t *)bptr++ = (p >> 8) & 0xff;
-                                *(uint8_t *)bptr = p & 0xff;
-				ra = 0;
-				return 1;   /* port redirected, we're done */
-				break;
-
-			 default:
-				ra = 0;
-			}
-			ra++;
-		}
-		return 1;
-
-	 default:
-		/* Ooops, not emulated, won't call tcp_emu again */
-		so->so_emu = 0;
-		return 1;
-	}
-}
-
-/*
- * Do misc. config of SLiRP while its running.
- * Return 0 if this connections is to be closed, 1 otherwise,
- * return 2 if this is a command-line connection
- */
-int tcp_ctl(struct socket *so)
-{
-    Slirp *slirp = so->slirp;
-    struct sbuf *sb = &so->so_snd;
-    struct gfwd_list *ex_ptr;
-
-    DEBUG_CALL("tcp_ctl");
-    DEBUG_ARG("so = %p", so);
-
-    /* TODO: IPv6 */
-    if (so->so_faddr.s_addr != slirp->vhost_addr.s_addr) {
-        /* Check if it's pty_exec */
-        for (ex_ptr = slirp->guestfwd_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
-            if (ex_ptr->ex_fport == so->so_fport &&
-                so->so_faddr.s_addr == ex_ptr->ex_addr.s_addr) {
-                if (ex_ptr->write_cb) {
-                    so->s = -1;
-                    so->guestfwd = ex_ptr;
-                    return 1;
-                }
-                DEBUG_MISC(" executing %s", ex_ptr->ex_exec);
-                return fork_exec(so, ex_ptr->ex_exec);
-            }
-        }
-    }
-    sb->sb_cc =
-        snprintf(sb->sb_wptr, sb->sb_datalen - (sb->sb_wptr - sb->sb_data),
-                 "Error: No application configured.\r\n");
-    sb->sb_wptr += sb->sb_cc;
-    return 0;
-}
diff --git a/slirp/src/tcp_timer.c b/slirp/src/tcp_timer.c
deleted file mode 100644
index be361a1..0000000
--- a/slirp/src/tcp_timer.c
+++ /dev/null
@@ -1,294 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1982, 1986, 1988, 1990, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)tcp_timer.c	8.1 (Berkeley) 6/10/93
- * tcp_timer.c,v 1.2 1994/08/02 07:49:10 davidg Exp
- */
-
-#include "slirp.h"
-
-static struct tcpcb *tcp_timers(register struct tcpcb *tp, int timer);
-
-/*
- * Fast timeout routine for processing delayed acks
- */
-void
-tcp_fasttimo(Slirp *slirp)
-{
-	register struct socket *so;
-	register struct tcpcb *tp;
-
-	DEBUG_CALL("tcp_fasttimo");
-
-	so = slirp->tcb.so_next;
-	if (so)
-	for (; so != &slirp->tcb; so = so->so_next)
-		if ((tp = (struct tcpcb *)so->so_tcpcb) &&
-		    (tp->t_flags & TF_DELACK)) {
-			tp->t_flags &= ~TF_DELACK;
-			tp->t_flags |= TF_ACKNOW;
-			(void) tcp_output(tp);
-		}
-}
-
-/*
- * Tcp protocol timeout routine called every 500 ms.
- * Updates the timers in all active tcb's and
- * causes finite state machine actions if timers expire.
- */
-void
-tcp_slowtimo(Slirp *slirp)
-{
-	register struct socket *ip, *ipnxt;
-	register struct tcpcb *tp;
-	register int i;
-
-	DEBUG_CALL("tcp_slowtimo");
-
-	/*
-	 * Search through tcb's and update active timers.
-	 */
-	ip = slirp->tcb.so_next;
-        if (ip == NULL) {
-            return;
-        }
-	for (; ip != &slirp->tcb; ip = ipnxt) {
-		ipnxt = ip->so_next;
-		tp = sototcpcb(ip);
-                if (tp == NULL) {
-                        continue;
-                }
-		for (i = 0; i < TCPT_NTIMERS; i++) {
-			if (tp->t_timer[i] && --tp->t_timer[i] == 0) {
-				tcp_timers(tp,i);
-				if (ipnxt->so_prev != ip)
-					goto tpgone;
-			}
-		}
-		tp->t_idle++;
-		if (tp->t_rtt)
-		   tp->t_rtt++;
-tpgone:
-		;
-	}
-	slirp->tcp_iss += TCP_ISSINCR/PR_SLOWHZ;	/* increment iss */
-	slirp->tcp_now++;				/* for timestamps */
-}
-
-/*
- * Cancel all timers for TCP tp.
- */
-void
-tcp_canceltimers(struct tcpcb *tp)
-{
-	register int i;
-
-	for (i = 0; i < TCPT_NTIMERS; i++)
-		tp->t_timer[i] = 0;
-}
-
-const int tcp_backoff[TCP_MAXRXTSHIFT + 1] =
-   { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
-
-/*
- * TCP timer processing.
- */
-static struct tcpcb *
-tcp_timers(register struct tcpcb *tp, int timer)
-{
-	register int rexmt;
-
-	DEBUG_CALL("tcp_timers");
-
-	switch (timer) {
-
-	/*
-	 * 2 MSL timeout in shutdown went off.  If we're closed but
-	 * still waiting for peer to close and connection has been idle
-	 * too long, or if 2MSL time is up from TIME_WAIT, delete connection
-	 * control block.  Otherwise, check again in a bit.
-	 */
-	case TCPT_2MSL:
-		if (tp->t_state != TCPS_TIME_WAIT &&
-		    tp->t_idle <= TCP_MAXIDLE)
-			tp->t_timer[TCPT_2MSL] = TCPTV_KEEPINTVL;
-		else
-			tp = tcp_close(tp);
-		break;
-
-	/*
-	 * Retransmission timer went off.  Message has not
-	 * been acked within retransmit interval.  Back off
-	 * to a longer retransmit interval and retransmit one segment.
-	 */
-	case TCPT_REXMT:
-
-		/*
-		 * XXXXX If a packet has timed out, then remove all the queued
-		 * packets for that session.
-		 */
-
-		if (++tp->t_rxtshift > TCP_MAXRXTSHIFT) {
-			/*
-			 * This is a hack to suit our terminal server here at the uni of canberra
-			 * since they have trouble with zeroes... It usually lets them through
-			 * unharmed, but under some conditions, it'll eat the zeros.  If we
-			 * keep retransmitting it, it'll keep eating the zeroes, so we keep
-			 * retransmitting, and eventually the connection dies...
-			 * (this only happens on incoming data)
-			 *
-			 * So, if we were gonna drop the connection from too many retransmits,
-			 * don't... instead halve the t_maxseg, which might break up the NULLs and
-			 * let them through
-			 *
-			 * *sigh*
-			 */
-
-			tp->t_maxseg >>= 1;
-			if (tp->t_maxseg < 32) {
-				/*
-				 * We tried our best, now the connection must die!
-				 */
-				tp->t_rxtshift = TCP_MAXRXTSHIFT;
-				tp = tcp_drop(tp, tp->t_softerror);
-				/* tp->t_softerror : ETIMEDOUT); */ /* XXX */
-				return (tp); /* XXX */
-			}
-
-			/*
-			 * Set rxtshift to 6, which is still at the maximum
-			 * backoff time
-			 */
-			tp->t_rxtshift = 6;
-		}
-		rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift];
-		TCPT_RANGESET(tp->t_rxtcur, rexmt,
-		    (short)tp->t_rttmin, TCPTV_REXMTMAX); /* XXX */
-		tp->t_timer[TCPT_REXMT] = tp->t_rxtcur;
-		/*
-		 * If losing, let the lower level know and try for
-		 * a better route.  Also, if we backed off this far,
-		 * our srtt estimate is probably bogus.  Clobber it
-		 * so we'll take the next rtt measurement as our srtt;
-		 * move the current srtt into rttvar to keep the current
-		 * retransmit times until then.
-		 */
-		if (tp->t_rxtshift > TCP_MAXRXTSHIFT / 4) {
-			tp->t_rttvar += (tp->t_srtt >> TCP_RTT_SHIFT);
-			tp->t_srtt = 0;
-		}
-		tp->snd_nxt = tp->snd_una;
-		/*
-		 * If timing a segment in this window, stop the timer.
-		 */
-		tp->t_rtt = 0;
-		/*
-		 * Close the congestion window down to one segment
-		 * (we'll open it by one segment for each ack we get).
-		 * Since we probably have a window's worth of unacked
-		 * data accumulated, this "slow start" keeps us from
-		 * dumping all that data as back-to-back packets (which
-		 * might overwhelm an intermediate gateway).
-		 *
-		 * There are two phases to the opening: Initially we
-		 * open by one mss on each ack.  This makes the window
-		 * size increase exponentially with time.  If the
-		 * window is larger than the path can handle, this
-		 * exponential growth results in dropped packet(s)
-		 * almost immediately.  To get more time between
-		 * drops but still "push" the network to take advantage
-		 * of improving conditions, we switch from exponential
-		 * to linear window opening at some threshold size.
-		 * For a threshold, we use half the current window
-		 * size, truncated to a multiple of the mss.
-		 *
-		 * (the minimum cwnd that will give us exponential
-		 * growth is 2 mss.  We don't allow the threshold
-		 * to go below this.)
-		 */
-		{
-                unsigned win = MIN(tp->snd_wnd, tp->snd_cwnd) / 2 / tp->t_maxseg;
-		if (win < 2)
-			win = 2;
-		tp->snd_cwnd = tp->t_maxseg;
-		tp->snd_ssthresh = win * tp->t_maxseg;
-		tp->t_dupacks = 0;
-		}
-		(void) tcp_output(tp);
-		break;
-
-	/*
-	 * Persistence timer into zero window.
-	 * Force a byte to be output, if possible.
-	 */
-	case TCPT_PERSIST:
-		tcp_setpersist(tp);
-		tp->t_force = 1;
-		(void) tcp_output(tp);
-		tp->t_force = 0;
-		break;
-
-	/*
-	 * Keep-alive timer went off; send something
-	 * or drop connection if idle for too long.
-	 */
-	case TCPT_KEEP:
-		if (tp->t_state < TCPS_ESTABLISHED)
-			goto dropit;
-
-		if (slirp_do_keepalive && tp->t_state <= TCPS_CLOSE_WAIT) {
-			if (tp->t_idle >= TCPTV_KEEP_IDLE + TCP_MAXIDLE)
-				goto dropit;
-			/*
-			 * Send a packet designed to force a response
-			 * if the peer is up and reachable:
-			 * either an ACK if the connection is still alive,
-			 * or an RST if the peer has closed the connection
-			 * due to timeout or reboot.
-			 * Using sequence number tp->snd_una-1
-			 * causes the transmitted zero-length segment
-			 * to lie outside the receive window;
-			 * by the protocol spec, this requires the
-			 * correspondent TCP to respond.
-			 */
-			tcp_respond(tp, &tp->t_template, (struct mbuf *)NULL,
-			    tp->rcv_nxt, tp->snd_una - 1, 0,
-			    tp->t_socket->so_ffamily);
-			tp->t_timer[TCPT_KEEP] = TCPTV_KEEPINTVL;
-		} else
-			tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_IDLE;
-		break;
-
-	dropit:
-		tp = tcp_drop(tp, 0);
-		break;
-	}
-
-	return (tp);
-}
diff --git a/slirp/src/tcp_timer.h b/slirp/src/tcp_timer.h
deleted file mode 100644
index 709f639..0000000
--- a/slirp/src/tcp_timer.h
+++ /dev/null
@@ -1,128 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1982, 1986, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)tcp_timer.h	8.1 (Berkeley) 6/10/93
- * tcp_timer.h,v 1.4 1994/08/21 05:27:38 paul Exp
- */
-
-#ifndef TCP_TIMER_H
-#define TCP_TIMER_H
-
-/*
- * Definitions of the TCP timers.  These timers are counted
- * down PR_SLOWHZ times a second.
- */
-#define	TCPT_NTIMERS	4
-
-#define	TCPT_REXMT	0		/* retransmit */
-#define	TCPT_PERSIST	1		/* retransmit persistence */
-#define	TCPT_KEEP	2		/* keep alive */
-#define	TCPT_2MSL	3		/* 2*msl quiet time timer */
-
-/*
- * The TCPT_REXMT timer is used to force retransmissions.
- * The TCP has the TCPT_REXMT timer set whenever segments
- * have been sent for which ACKs are expected but not yet
- * received.  If an ACK is received which advances tp->snd_una,
- * then the retransmit timer is cleared (if there are no more
- * outstanding segments) or reset to the base value (if there
- * are more ACKs expected).  Whenever the retransmit timer goes off,
- * we retransmit one unacknowledged segment, and do a backoff
- * on the retransmit timer.
- *
- * The TCPT_PERSIST timer is used to keep window size information
- * flowing even if the window goes shut.  If all previous transmissions
- * have been acknowledged (so that there are no retransmissions in progress),
- * and the window is too small to bother sending anything, then we start
- * the TCPT_PERSIST timer.  When it expires, if the window is nonzero,
- * we go to transmit state.  Otherwise, at intervals send a single byte
- * into the peer's window to force him to update our window information.
- * We do this at most as often as TCPT_PERSMIN time intervals,
- * but no more frequently than the current estimate of round-trip
- * packet time.  The TCPT_PERSIST timer is cleared whenever we receive
- * a window update from the peer.
- *
- * The TCPT_KEEP timer is used to keep connections alive.  If an
- * connection is idle (no segments received) for TCPTV_KEEP_INIT amount of time,
- * but not yet established, then we drop the connection.  Once the connection
- * is established, if the connection is idle for TCPTV_KEEP_IDLE time
- * (and keepalives have been enabled on the socket), we begin to probe
- * the connection.  We force the peer to send us a segment by sending:
- *	<SEQ=SND.UNA-1><ACK=RCV.NXT><CTL=ACK>
- * This segment is (deliberately) outside the window, and should elicit
- * an ack segment in response from the peer.  If, despite the TCPT_KEEP
- * initiated segments we cannot elicit a response from a peer in TCPT_MAXIDLE
- * amount of time probing, then we drop the connection.
- */
-
-/*
- * Time constants.
- */
-#define TCPTV_MSL       ( 5*PR_SLOWHZ)          /* max seg lifetime (hah!) */
-
-#define	TCPTV_SRTTBASE	0			/* base roundtrip time;
-						   if 0, no idea yet */
-#define	TCPTV_SRTTDFLT	(  3*PR_SLOWHZ)		/* assumed RTT if no info */
-
-#define	TCPTV_PERSMIN	(  5*PR_SLOWHZ)		/* retransmit persistence */
-#define	TCPTV_PERSMAX	( 60*PR_SLOWHZ)		/* maximum persist interval */
-
-#define	TCPTV_KEEP_INIT	( 75*PR_SLOWHZ)		/* initial connect keep alive */
-#define	TCPTV_KEEP_IDLE	(120*60*PR_SLOWHZ)	/* dflt time before probing */
-#define	TCPTV_KEEPINTVL	( 75*PR_SLOWHZ)		/* default probe interval */
-#define	TCPTV_KEEPCNT	8			/* max probes before drop */
-
-#define	TCPTV_MIN	(  1*PR_SLOWHZ)		/* minimum allowable value */
-#define TCPTV_REXMTMAX  ( 12*PR_SLOWHZ)		/* max allowable REXMT value */
-
-#define	TCP_LINGERTIME	120			/* linger at most 2 minutes */
-
-#define TCP_MAXRXTSHIFT 12                      /* maximum retransmits */
-
-
-/*
- * Force a time value to be in a certain range.
- */
-#define	TCPT_RANGESET(tv, value, tvmin, tvmax) { \
-	(tv) = (value); \
-	if ((tv) < (tvmin)) \
-		(tv) = (tvmin); \
-	else if ((tv) > (tvmax)) \
-		(tv) = (tvmax); \
-}
-
-extern const int tcp_backoff[];
-
-struct tcpcb;
-
-void tcp_fasttimo(Slirp *);
-void tcp_slowtimo(Slirp *);
-void tcp_canceltimers(struct tcpcb *);
-
-#endif
diff --git a/slirp/src/tcp_var.h b/slirp/src/tcp_var.h
deleted file mode 100644
index 162be6e..0000000
--- a/slirp/src/tcp_var.h
+++ /dev/null
@@ -1,162 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1982, 1986, 1993, 1994
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)tcp_var.h	8.3 (Berkeley) 4/10/94
- * tcp_var.h,v 1.3 1994/08/21 05:27:39 paul Exp
- */
-
-#ifndef TCP_VAR_H
-#define TCP_VAR_H
-
-#include "tcpip.h"
-#include "tcp_timer.h"
-
-/*
- * Tcp control block, one per tcp; fields:
- */
-struct tcpcb {
-	struct tcpiphdr *seg_next;	/* sequencing queue */
-	struct tcpiphdr *seg_prev;
-	short	t_state;		/* state of this connection */
-	short	t_timer[TCPT_NTIMERS];	/* tcp timers */
-	short	t_rxtshift;		/* log(2) of rexmt exp. backoff */
-	short	t_rxtcur;		/* current retransmit value */
-	short	t_dupacks;		/* consecutive dup acks recd */
-	uint16_t	t_maxseg;		/* maximum segment size */
-	uint8_t t_force;		/* 1 if forcing out a byte */
-	uint16_t	t_flags;
-#define	TF_ACKNOW	0x0001		/* ack peer immediately */
-#define	TF_DELACK	0x0002		/* ack, but try to delay it */
-#define	TF_NODELAY	0x0004		/* don't delay packets to coalesce */
-#define	TF_NOOPT	0x0008		/* don't use tcp options */
-#define	TF_SENTFIN	0x0010		/* have sent FIN */
-#define	TF_REQ_SCALE	0x0020		/* have/will request window scaling */
-#define	TF_RCVD_SCALE	0x0040		/* other side has requested scaling */
-#define	TF_REQ_TSTMP	0x0080		/* have/will request timestamps */
-#define	TF_RCVD_TSTMP	0x0100		/* a timestamp was received in SYN */
-#define	TF_SACK_PERMIT	0x0200		/* other side said I could SACK */
-
-	struct	tcpiphdr t_template;    /* static skeletal packet for xmit */
-
-	struct	socket *t_socket;		/* back pointer to socket */
-/*
- * The following fields are used as in the protocol specification.
- * See RFC783, Dec. 1981, page 21.
- */
-/* send sequence variables */
-	tcp_seq	snd_una;		/* send unacknowledged */
-	tcp_seq	snd_nxt;		/* send next */
-	tcp_seq	snd_up;			/* send urgent pointer */
-	tcp_seq	snd_wl1;		/* window update seg seq number */
-	tcp_seq	snd_wl2;		/* window update seg ack number */
-	tcp_seq	iss;			/* initial send sequence number */
-	uint32_t snd_wnd;		/* send window */
-/* receive sequence variables */
-	uint32_t rcv_wnd;		/* receive window */
-	tcp_seq	rcv_nxt;		/* receive next */
-	tcp_seq	rcv_up;			/* receive urgent pointer */
-	tcp_seq	irs;			/* initial receive sequence number */
-/*
- * Additional variables for this implementation.
- */
-/* receive variables */
-	tcp_seq	rcv_adv;		/* advertised window */
-/* retransmit variables */
-	tcp_seq	snd_max;		/* highest sequence number sent;
-					 * used to recognize retransmits
-					 */
-/* congestion control (for slow start, source quench, retransmit after loss) */
-	uint32_t snd_cwnd;		/* congestion-controlled window */
-	uint32_t snd_ssthresh;		/* snd_cwnd size threshold for
-					 * for slow start exponential to
-					 * linear switch
-					 */
-/*
- * transmit timing stuff.  See below for scale of srtt and rttvar.
- * "Variance" is actually smoothed difference.
- */
-	short	t_idle;			/* inactivity time */
-	short	t_rtt;			/* round trip time */
-	tcp_seq	t_rtseq;		/* sequence number being timed */
-	short	t_srtt;			/* smoothed round-trip time */
-	short	t_rttvar;		/* variance in round-trip time */
-	uint16_t	t_rttmin;		/* minimum rtt allowed */
-	uint32_t max_sndwnd;		/* largest window peer has offered */
-
-/* out-of-band data */
-	uint8_t	t_oobflags;		/* have some */
-	uint8_t	t_iobc;			/* input character */
-#define	TCPOOB_HAVEDATA	0x01
-#define	TCPOOB_HADDATA	0x02
-	short	t_softerror;		/* possible error not yet reported */
-
-/* RFC 1323 variables */
-	uint8_t	snd_scale;		/* window scaling for send window */
-	uint8_t	rcv_scale;		/* window scaling for recv window */
-	uint8_t	request_r_scale;	/* pending window scaling */
-	uint8_t	requested_s_scale;
-	uint32_t	ts_recent;		/* timestamp echo data */
-	uint32_t	ts_recent_age;		/* when last updated */
-	tcp_seq	last_ack_sent;
-
-};
-
-#define	sototcpcb(so)	((so)->so_tcpcb)
-
-/*
- * The smoothed round-trip time and estimated variance
- * are stored as fixed point numbers scaled by the values below.
- * For convenience, these scales are also used in smoothing the average
- * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
- * With these scales, srtt has 3 bits to the right of the binary point,
- * and thus an "ALPHA" of 0.875.  rttvar has 2 bits to the right of the
- * binary point, and is smoothed with an ALPHA of 0.75.
- */
-#define	TCP_RTT_SCALE		8	/* multiplier for srtt; 3 bits frac. */
-#define	TCP_RTT_SHIFT		3	/* shift for srtt; 3 bits frac. */
-#define	TCP_RTTVAR_SCALE	4	/* multiplier for rttvar; 2 bits */
-#define	TCP_RTTVAR_SHIFT	2	/* multiplier for rttvar; 2 bits */
-
-/*
- * The initial retransmission should happen at rtt + 4 * rttvar.
- * Because of the way we do the smoothing, srtt and rttvar
- * will each average +1/2 tick of bias.  When we compute
- * the retransmit timer, we want 1/2 tick of rounding and
- * 1 extra tick because of +-1/2 tick uncertainty in the
- * firing of the timer.  The bias will give us exactly the
- * 1.5 tick we need.  But, because the bias is
- * statistical, we have to test that we don't drop below
- * the minimum feasible timer (which is 2 ticks).
- * This macro assumes that the value of TCP_RTTVAR_SCALE
- * is the same as the multiplier for rttvar.
- */
-#define	TCP_REXMTVAL(tp) \
-	(((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar)
-
-#endif
diff --git a/slirp/src/tcpip.h b/slirp/src/tcpip.h
deleted file mode 100644
index 560a864..0000000
--- a/slirp/src/tcpip.h
+++ /dev/null
@@ -1,102 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1982, 1986, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)tcpip.h	8.1 (Berkeley) 6/10/93
- * tcpip.h,v 1.3 1994/08/21 05:27:40 paul Exp
- */
-
-#ifndef TCPIP_H
-#define TCPIP_H
-
-/*
- * Tcp+ip header, after ip options removed.
- */
-struct tcpiphdr {
-    struct mbuf_ptr ih_mbuf;	/* backpointer to mbuf */
-    union {
-        struct {
-            struct  in_addr ih_src; /* source internet address */
-            struct  in_addr ih_dst; /* destination internet address */
-            uint8_t ih_x1;          /* (unused) */
-            uint8_t ih_pr;          /* protocol */
-        } ti_i4;
-        struct {
-            struct  in6_addr ih_src;
-            struct  in6_addr ih_dst;
-            uint8_t ih_x1;
-            uint8_t ih_nh;
-        } ti_i6;
-    } ti;
-    uint16_t    ti_x0;
-    uint16_t    ti_len;             /* protocol length */
-    struct      tcphdr ti_t;        /* tcp header */
-};
-#define	ti_mbuf		ih_mbuf.mptr
-#define	ti_pr		ti.ti_i4.ih_pr
-#define	ti_src		ti.ti_i4.ih_src
-#define	ti_dst		ti.ti_i4.ih_dst
-#define	ti_src6		ti.ti_i6.ih_src
-#define	ti_dst6		ti.ti_i6.ih_dst
-#define	ti_nh6		ti.ti_i6.ih_nh
-#define	ti_sport	ti_t.th_sport
-#define	ti_dport	ti_t.th_dport
-#define	ti_seq		ti_t.th_seq
-#define	ti_ack		ti_t.th_ack
-#define	ti_x2		ti_t.th_x2
-#define	ti_off		ti_t.th_off
-#define	ti_flags	ti_t.th_flags
-#define	ti_win		ti_t.th_win
-#define	ti_sum		ti_t.th_sum
-#define	ti_urp		ti_t.th_urp
-
-#define tcpiphdr2qlink(T) ((struct qlink*)(((char*)(T)) - sizeof(struct qlink)))
-#define qlink2tcpiphdr(Q) ((struct tcpiphdr*)(((char*)(Q)) + sizeof(struct qlink)))
-#define tcpiphdr_next(T) qlink2tcpiphdr(tcpiphdr2qlink(T)->next)
-#define tcpiphdr_prev(T) qlink2tcpiphdr(tcpiphdr2qlink(T)->prev)
-#define tcpfrag_list_first(T) qlink2tcpiphdr((T)->seg_next)
-#define tcpfrag_list_end(F, T) (tcpiphdr2qlink(F) == (struct qlink*)(T))
-#define tcpfrag_list_empty(T) ((T)->seg_next == (struct tcpiphdr*)(T))
-
-/* This is the difference between the size of a tcpiphdr structure, and the
- * size of actual ip+tcp headers, rounded up since we need to align data.  */
-#define TCPIPHDR_DELTA\
-    (MAX(0,\
-         (sizeof(struct tcpiphdr)\
-          - sizeof(struct ip) - sizeof(struct tcphdr) + 3) & ~3))
-
-/*
- * Just a clean way to get to the first byte
- * of the packet
- */
-struct tcpiphdr_2 {
-	struct tcpiphdr dummy;
-	char first_char;
-};
-
-#endif
diff --git a/slirp/src/tftp.c b/slirp/src/tftp.c
deleted file mode 100644
index 2071dca..0000000
--- a/slirp/src/tftp.c
+++ /dev/null
@@ -1,463 +0,0 @@
-/* SPDX-License-Identifier: MIT */
-/*
- * tftp.c - a simple, read-only tftp server for qemu
- *
- * Copyright (c) 2004 Magnus Damm <damm@opensource.se>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-#include "slirp.h"
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-
-static inline int tftp_session_in_use(struct tftp_session *spt)
-{
-    return (spt->slirp != NULL);
-}
-
-static inline void tftp_session_update(struct tftp_session *spt)
-{
-    spt->timestamp = curtime;
-}
-
-static void tftp_session_terminate(struct tftp_session *spt)
-{
-    if (spt->fd >= 0) {
-        close(spt->fd);
-        spt->fd = -1;
-    }
-    g_free(spt->filename);
-    spt->slirp = NULL;
-}
-
-static int tftp_session_allocate(Slirp *slirp, struct sockaddr_storage *srcsas,
-                                 struct tftp_t *tp)
-{
-  struct tftp_session *spt;
-  int k;
-
-  for (k = 0; k < TFTP_SESSIONS_MAX; k++) {
-    spt = &slirp->tftp_sessions[k];
-
-    if (!tftp_session_in_use(spt))
-        goto found;
-
-    /* sessions time out after 5 inactive seconds */
-    if ((int)(curtime - spt->timestamp) > 5000) {
-        tftp_session_terminate(spt);
-        goto found;
-    }
-  }
-
-  return -1;
-
- found:
-  memset(spt, 0, sizeof(*spt));
-  memcpy(&spt->client_addr, srcsas, sockaddr_size(srcsas));
-  spt->fd = -1;
-  spt->block_size = 512;
-  spt->client_port = tp->udp.uh_sport;
-  spt->slirp = slirp;
-
-  tftp_session_update(spt);
-
-  return k;
-}
-
-static int tftp_session_find(Slirp *slirp, struct sockaddr_storage *srcsas,
-                             struct tftp_t *tp)
-{
-  struct tftp_session *spt;
-  int k;
-
-  for (k = 0; k < TFTP_SESSIONS_MAX; k++) {
-    spt = &slirp->tftp_sessions[k];
-
-    if (tftp_session_in_use(spt)) {
-      if (sockaddr_equal(&spt->client_addr, srcsas)) {
-	if (spt->client_port == tp->udp.uh_sport) {
-	  return k;
-	}
-      }
-    }
-  }
-
-  return -1;
-}
-
-static int tftp_read_data(struct tftp_session *spt, uint32_t block_nr,
-                          uint8_t *buf, int len)
-{
-    int bytes_read = 0;
-
-    if (spt->fd < 0) {
-        spt->fd = open(spt->filename, O_RDONLY | O_BINARY);
-    }
-
-    if (spt->fd < 0) {
-        return -1;
-    }
-
-    if (len) {
-        lseek(spt->fd, block_nr * spt->block_size, SEEK_SET);
-
-        bytes_read = read(spt->fd, buf, len);
-    }
-
-    return bytes_read;
-}
-
-static struct tftp_t *tftp_prep_mbuf_data(struct tftp_session *spt,
-                                          struct mbuf *m)
-{
-    struct tftp_t *tp;
-
-    memset(m->m_data, 0, m->m_size);
-
-    m->m_data += IF_MAXLINKHDR;
-    if (spt->client_addr.ss_family == AF_INET6) {
-        m->m_data += sizeof(struct ip6);
-    } else {
-        m->m_data += sizeof(struct ip);
-    }
-    tp = (void *)m->m_data;
-    m->m_data += sizeof(struct udphdr);
-
-    return tp;
-}
-
-static void tftp_udp_output(struct tftp_session *spt, struct mbuf *m,
-                            struct tftp_t *recv_tp)
-{
-    if (spt->client_addr.ss_family == AF_INET6) {
-        struct sockaddr_in6 sa6, da6;
-
-        sa6.sin6_addr = spt->slirp->vhost_addr6;
-        sa6.sin6_port = recv_tp->udp.uh_dport;
-        da6.sin6_addr = ((struct sockaddr_in6 *)&spt->client_addr)->sin6_addr;
-        da6.sin6_port = spt->client_port;
-
-        udp6_output(NULL, m, &sa6, &da6);
-    } else {
-        struct sockaddr_in sa4, da4;
-
-        sa4.sin_addr = spt->slirp->vhost_addr;
-        sa4.sin_port = recv_tp->udp.uh_dport;
-        da4.sin_addr = ((struct sockaddr_in *)&spt->client_addr)->sin_addr;
-        da4.sin_port = spt->client_port;
-
-        udp_output(NULL, m, &sa4, &da4, IPTOS_LOWDELAY);
-    }
-}
-
-static int tftp_send_oack(struct tftp_session *spt,
-                          const char *keys[], uint32_t values[], int nb,
-                          struct tftp_t *recv_tp)
-{
-    struct mbuf *m;
-    struct tftp_t *tp;
-    int i, n = 0;
-
-    m = m_get(spt->slirp);
-
-    if (!m)
-        return -1;
-
-    tp = tftp_prep_mbuf_data(spt, m);
-
-    tp->tp_op = htons(TFTP_OACK);
-    for (i = 0; i < nb; i++) {
-        n += snprintf(tp->x.tp_buf + n, sizeof(tp->x.tp_buf) - n, "%s",
-                      keys[i]) + 1;
-        n += snprintf(tp->x.tp_buf + n, sizeof(tp->x.tp_buf) - n, "%u",
-                      values[i]) + 1;
-    }
-
-    m->m_len = sizeof(struct tftp_t) - (TFTP_BLOCKSIZE_MAX + 2) + n
-               - sizeof(struct udphdr);
-    tftp_udp_output(spt, m, recv_tp);
-
-    return 0;
-}
-
-static void tftp_send_error(struct tftp_session *spt,
-                            uint16_t errorcode, const char *msg,
-                            struct tftp_t *recv_tp)
-{
-  struct mbuf *m;
-  struct tftp_t *tp;
-
-  DEBUG_TFTP("tftp error msg: %s", msg);
-
-  m = m_get(spt->slirp);
-
-  if (!m) {
-    goto out;
-  }
-
-  tp = tftp_prep_mbuf_data(spt, m);
-
-  tp->tp_op = htons(TFTP_ERROR);
-  tp->x.tp_error.tp_error_code = htons(errorcode);
-  slirp_pstrcpy((char *)tp->x.tp_error.tp_msg, sizeof(tp->x.tp_error.tp_msg), msg);
-
-  m->m_len = sizeof(struct tftp_t) - (TFTP_BLOCKSIZE_MAX + 2) + 3 + strlen(msg)
-             - sizeof(struct udphdr);
-  tftp_udp_output(spt, m, recv_tp);
-
-out:
-  tftp_session_terminate(spt);
-}
-
-static void tftp_send_next_block(struct tftp_session *spt,
-                                 struct tftp_t *recv_tp)
-{
-  struct mbuf *m;
-  struct tftp_t *tp;
-  int nobytes;
-
-  m = m_get(spt->slirp);
-
-  if (!m) {
-    return;
-  }
-
-  tp = tftp_prep_mbuf_data(spt, m);
-
-  tp->tp_op = htons(TFTP_DATA);
-  tp->x.tp_data.tp_block_nr = htons((spt->block_nr + 1) & 0xffff);
-
-  nobytes = tftp_read_data(spt, spt->block_nr, tp->x.tp_data.tp_buf,
-                           spt->block_size);
-
-  if (nobytes < 0) {
-    m_free(m);
-
-    /* send "file not found" error back */
-
-    tftp_send_error(spt, 1, "File not found", tp);
-
-    return;
-  }
-
-  m->m_len = sizeof(struct tftp_t) - (TFTP_BLOCKSIZE_MAX - nobytes)
-             - sizeof(struct udphdr);
-  tftp_udp_output(spt, m, recv_tp);
-
-  if (nobytes == spt->block_size) {
-    tftp_session_update(spt);
-  }
-  else {
-    tftp_session_terminate(spt);
-  }
-
-  spt->block_nr++;
-}
-
-static void tftp_handle_rrq(Slirp *slirp, struct sockaddr_storage *srcsas,
-                            struct tftp_t *tp, int pktlen)
-{
-  struct tftp_session *spt;
-  int s, k;
-  size_t prefix_len;
-  char *req_fname;
-  const char *option_name[2];
-  uint32_t option_value[2];
-  int nb_options = 0;
-
-  /* check if a session already exists and if so terminate it */
-  s = tftp_session_find(slirp, srcsas, tp);
-  if (s >= 0) {
-    tftp_session_terminate(&slirp->tftp_sessions[s]);
-  }
-
-  s = tftp_session_allocate(slirp, srcsas, tp);
-
-  if (s < 0) {
-    return;
-  }
-
-  spt = &slirp->tftp_sessions[s];
-
-  /* unspecified prefix means service disabled */
-  if (!slirp->tftp_prefix) {
-      tftp_send_error(spt, 2, "Access violation", tp);
-      return;
-  }
-
-  /* skip header fields */
-  k = 0;
-  pktlen -= offsetof(struct tftp_t, x.tp_buf);
-
-  /* prepend tftp_prefix */
-  prefix_len = strlen(slirp->tftp_prefix);
-  spt->filename = g_malloc(prefix_len + TFTP_FILENAME_MAX + 2);
-  memcpy(spt->filename, slirp->tftp_prefix, prefix_len);
-  spt->filename[prefix_len] = '/';
-
-  /* get name */
-  req_fname = spt->filename + prefix_len + 1;
-
-  while (1) {
-    if (k >= TFTP_FILENAME_MAX || k >= pktlen) {
-      tftp_send_error(spt, 2, "Access violation", tp);
-      return;
-    }
-    req_fname[k] = tp->x.tp_buf[k];
-    if (req_fname[k++] == '\0') {
-      break;
-    }
-  }
-
-  DEBUG_TFTP("tftp rrq file: %s", req_fname);
-
-  /* check mode */
-  if ((pktlen - k) < 6) {
-    tftp_send_error(spt, 2, "Access violation", tp);
-    return;
-  }
-
-  if (strcasecmp(&tp->x.tp_buf[k], "octet") != 0) {
-      tftp_send_error(spt, 4, "Unsupported transfer mode", tp);
-      return;
-  }
-
-  k += 6; /* skipping octet */
-
-  /* do sanity checks on the filename */
-  if (!strncmp(req_fname, "../", 3) ||
-      req_fname[strlen(req_fname) - 1] == '/' ||
-      strstr(req_fname, "/../")) {
-      tftp_send_error(spt, 2, "Access violation", tp);
-      return;
-  }
-
-  /* check if the file exists */
-  if (tftp_read_data(spt, 0, NULL, 0) < 0) {
-      tftp_send_error(spt, 1, "File not found", tp);
-      return;
-  }
-
-  if (tp->x.tp_buf[pktlen - 1] != 0) {
-      tftp_send_error(spt, 2, "Access violation", tp);
-      return;
-  }
-
-  while (k < pktlen && nb_options < G_N_ELEMENTS(option_name)) {
-      const char *key, *value;
-
-      key = &tp->x.tp_buf[k];
-      k += strlen(key) + 1;
-
-      if (k >= pktlen) {
-	  tftp_send_error(spt, 2, "Access violation", tp);
-	  return;
-      }
-
-      value = &tp->x.tp_buf[k];
-      k += strlen(value) + 1;
-
-      if (strcasecmp(key, "tsize") == 0) {
-	  int tsize = atoi(value);
-	  struct stat stat_p;
-
-	  if (tsize == 0) {
-	      if (stat(spt->filename, &stat_p) == 0)
-		  tsize = stat_p.st_size;
-	      else {
-		  tftp_send_error(spt, 1, "File not found", tp);
-		  return;
-	      }
-	  }
-
-          option_name[nb_options] = "tsize";
-          option_value[nb_options] = tsize;
-          nb_options++;
-      } else if (strcasecmp(key, "blksize") == 0) {
-          int blksize = atoi(value);
-
-          /* Accept blksize up to our maximum size */
-          if (blksize > 0) {
-              spt->block_size = MIN(blksize, TFTP_BLOCKSIZE_MAX);
-              option_name[nb_options] = "blksize";
-              option_value[nb_options] = spt->block_size;
-              nb_options++;
-          }
-      }
-  }
-
-  if (nb_options > 0) {
-      assert(nb_options <= G_N_ELEMENTS(option_name));
-      tftp_send_oack(spt, option_name, option_value, nb_options, tp);
-      return;
-  }
-
-  spt->block_nr = 0;
-  tftp_send_next_block(spt, tp);
-}
-
-static void tftp_handle_ack(Slirp *slirp, struct sockaddr_storage *srcsas,
-                            struct tftp_t *tp, int pktlen)
-{
-  int s;
-
-  s = tftp_session_find(slirp, srcsas, tp);
-
-  if (s < 0) {
-    return;
-  }
-
-  tftp_send_next_block(&slirp->tftp_sessions[s], tp);
-}
-
-static void tftp_handle_error(Slirp *slirp, struct sockaddr_storage *srcsas,
-                              struct tftp_t *tp, int pktlen)
-{
-  int s;
-
-  s = tftp_session_find(slirp, srcsas, tp);
-
-  if (s < 0) {
-    return;
-  }
-
-  tftp_session_terminate(&slirp->tftp_sessions[s]);
-}
-
-void tftp_input(struct sockaddr_storage *srcsas, struct mbuf *m)
-{
-  struct tftp_t *tp = (struct tftp_t *)m->m_data;
-
-  switch(ntohs(tp->tp_op)) {
-  case TFTP_RRQ:
-    tftp_handle_rrq(m->slirp, srcsas, tp, m->m_len);
-    break;
-
-  case TFTP_ACK:
-    tftp_handle_ack(m->slirp, srcsas, tp, m->m_len);
-    break;
-
-  case TFTP_ERROR:
-    tftp_handle_error(m->slirp, srcsas, tp, m->m_len);
-    break;
-  }
-}
diff --git a/slirp/src/tftp.h b/slirp/src/tftp.h
deleted file mode 100644
index 3fe3b70..0000000
--- a/slirp/src/tftp.h
+++ /dev/null
@@ -1,52 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/* tftp defines */
-
-#ifndef SLIRP_TFTP_H
-#define SLIRP_TFTP_H
-
-#define TFTP_SESSIONS_MAX 20
-
-#define TFTP_SERVER	69
-
-#define TFTP_RRQ    1
-#define TFTP_WRQ    2
-#define TFTP_DATA   3
-#define TFTP_ACK    4
-#define TFTP_ERROR  5
-#define TFTP_OACK   6
-
-#define TFTP_FILENAME_MAX 512
-#define TFTP_BLOCKSIZE_MAX 1428
-
-struct tftp_t {
-  struct udphdr udp;
-  uint16_t tp_op;
-  union {
-    struct {
-      uint16_t tp_block_nr;
-      uint8_t tp_buf[TFTP_BLOCKSIZE_MAX];
-    } tp_data;
-    struct {
-      uint16_t tp_error_code;
-      uint8_t tp_msg[TFTP_BLOCKSIZE_MAX];
-    } tp_error;
-    char tp_buf[TFTP_BLOCKSIZE_MAX + 2];
-  } x;
-} __attribute__((packed));
-
-struct tftp_session {
-    Slirp *slirp;
-    char *filename;
-    int fd;
-    uint16_t block_size;
-
-    struct sockaddr_storage client_addr;
-    uint16_t client_port;
-    uint32_t block_nr;
-
-    int timestamp;
-};
-
-void tftp_input(struct sockaddr_storage *srcsas, struct mbuf *m);
-
-#endif
diff --git a/slirp/src/udp.c b/slirp/src/udp.c
deleted file mode 100644
index 27bb829..0000000
--- a/slirp/src/udp.c
+++ /dev/null
@@ -1,363 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1982, 1986, 1988, 1990, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)udp_usrreq.c	8.4 (Berkeley) 1/21/94
- * udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
- */
-
-/*
- * Changes and additions relating to SLiRP
- * Copyright (c) 1995 Danny Gasparovski.
- *
- * Please read the file COPYRIGHT for the
- * terms and conditions of the copyright.
- */
-
-#include "slirp.h"
-#include "ip_icmp.h"
-
-static uint8_t udp_tos(struct socket *so);
-
-void
-udp_init(Slirp *slirp)
-{
-    slirp->udb.so_next = slirp->udb.so_prev = &slirp->udb;
-    slirp->udp_last_so = &slirp->udb;
-}
-
-void udp_cleanup(Slirp *slirp)
-{
-    while (slirp->udb.so_next != &slirp->udb) {
-        udp_detach(slirp->udb.so_next);
-    }
-}
-
-/* m->m_data  points at ip packet header
- * m->m_len   length ip packet
- * ip->ip_len length data (IPDU)
- */
-void
-udp_input(register struct mbuf *m, int iphlen)
-{
-	Slirp *slirp = m->slirp;
-	register struct ip *ip;
-	register struct udphdr *uh;
-	int len;
-	struct ip save_ip;
-	struct socket *so;
-	struct sockaddr_storage lhost;
-	struct sockaddr_in *lhost4;
-
-	DEBUG_CALL("udp_input");
-	DEBUG_ARG("m = %p", m);
-	DEBUG_ARG("iphlen = %d", iphlen);
-
-	/*
-	 * Strip IP options, if any; should skip this,
-	 * make available to user, and use on returned packets,
-	 * but we don't yet have a way to check the checksum
-	 * with options still present.
-	 */
-	if(iphlen > sizeof(struct ip)) {
-		ip_stripoptions(m, (struct mbuf *)0);
-		iphlen = sizeof(struct ip);
-	}
-
-	/*
-	 * Get IP and UDP header together in first mbuf.
-	 */
-	ip = mtod(m, struct ip *);
-	uh = (struct udphdr *)((char *)ip + iphlen);
-
-	/*
-	 * Make mbuf data length reflect UDP length.
-	 * If not enough data to reflect UDP length, drop.
-	 */
-	len = ntohs((uint16_t)uh->uh_ulen);
-
-	if (ip->ip_len != len) {
-		if (len > ip->ip_len) {
-			goto bad;
-		}
-		m_adj(m, len - ip->ip_len);
-		ip->ip_len = len;
-	}
-
-	/*
-	 * Save a copy of the IP header in case we want restore it
-	 * for sending an ICMP error message in response.
-	 */
-	save_ip = *ip;
-	save_ip.ip_len+= iphlen;         /* tcp_input subtracts this */
-
-	/*
-	 * Checksum extended UDP header and data.
-	 */
-	if (uh->uh_sum) {
-      memset(&((struct ipovly *)ip)->ih_mbuf, 0, sizeof(struct mbuf_ptr));
-	  ((struct ipovly *)ip)->ih_x1 = 0;
-	  ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
-	  if(cksum(m, len + sizeof(struct ip))) {
-	    goto bad;
-	  }
-	}
-
-	lhost.ss_family = AF_INET;
-	lhost4 = (struct sockaddr_in *) &lhost;
-	lhost4->sin_addr = ip->ip_src;
-	lhost4->sin_port = uh->uh_sport;
-
-        /*
-         *  handle DHCP/BOOTP
-         */
-        if (ntohs(uh->uh_dport) == BOOTP_SERVER &&
-            (ip->ip_dst.s_addr == slirp->vhost_addr.s_addr ||
-             ip->ip_dst.s_addr == 0xffffffff)) {
-                bootp_input(m);
-                goto bad;
-            }
-
-        /*
-         *  handle TFTP
-         */
-        if (ntohs(uh->uh_dport) == TFTP_SERVER &&
-            ip->ip_dst.s_addr == slirp->vhost_addr.s_addr) {
-            m->m_data += iphlen;
-            m->m_len -= iphlen;
-            tftp_input(&lhost, m);
-            m->m_data -= iphlen;
-            m->m_len += iphlen;
-            goto bad;
-        }
-
-        if (slirp->restricted) {
-            goto bad;
-        }
-
-	/*
-	 * Locate pcb for datagram.
-	 */
-	so = solookup(&slirp->udp_last_so, &slirp->udb, &lhost, NULL);
-
-	if (so == NULL) {
-	  /*
-	   * If there's no socket for this packet,
-	   * create one
-	   */
-	  so = socreate(slirp);
-	  if (udp_attach(so, AF_INET) == -1) {
-	    DEBUG_MISC(" udp_attach errno = %d-%s", errno, strerror(errno));
-	    sofree(so);
-	    goto bad;
-	  }
-
-	  /*
-	   * Setup fields
-	   */
-	  so->so_lfamily = AF_INET;
-	  so->so_laddr = ip->ip_src;
-	  so->so_lport = uh->uh_sport;
-
-	  if ((so->so_iptos = udp_tos(so)) == 0)
-	    so->so_iptos = ip->ip_tos;
-
-	  /*
-	   * XXXXX Here, check if it's in udpexec_list,
-	   * and if it is, do the fork_exec() etc.
-	   */
-	}
-
-        so->so_ffamily = AF_INET;
-        so->so_faddr = ip->ip_dst; /* XXX */
-        so->so_fport = uh->uh_dport; /* XXX */
-
-	iphlen += sizeof(struct udphdr);
-	m->m_len -= iphlen;
-	m->m_data += iphlen;
-
-	/*
-	 * Now we sendto() the packet.
-	 */
-	if(sosendto(so,m) == -1) {
-	  m->m_len += iphlen;
-	  m->m_data -= iphlen;
-	  *ip=save_ip;
-	  DEBUG_MISC("udp tx errno = %d-%s", errno, strerror(errno));
-	  icmp_send_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, 0,
-	                  strerror(errno));
-	  goto bad;
-	}
-
-	m_free(so->so_m);   /* used for ICMP if error on sorecvfrom */
-
-	/* restore the orig mbuf packet */
-	m->m_len += iphlen;
-	m->m_data -= iphlen;
-	*ip=save_ip;
-	so->so_m=m;         /* ICMP backup */
-
-	return;
-bad:
-	m_free(m);
-}
-
-int udp_output(struct socket *so, struct mbuf *m,
-                struct sockaddr_in *saddr, struct sockaddr_in *daddr,
-                int iptos)
-{
-	register struct udpiphdr *ui;
-	int error = 0;
-
-	DEBUG_CALL("udp_output");
-	DEBUG_ARG("so = %p", so);
-	DEBUG_ARG("m = %p", m);
-	DEBUG_ARG("saddr = %s", inet_ntoa(saddr->sin_addr));
-	DEBUG_ARG("daddr = %s", inet_ntoa(daddr->sin_addr));
-
-	/*
-	 * Adjust for header
-	 */
-	m->m_data -= sizeof(struct udpiphdr);
-	m->m_len += sizeof(struct udpiphdr);
-
-	/*
-	 * Fill in mbuf with extended UDP header
-	 * and addresses and length put into network format.
-	 */
-	ui = mtod(m, struct udpiphdr *);
-    memset(&ui->ui_i.ih_mbuf, 0 , sizeof(struct mbuf_ptr));
-	ui->ui_x1 = 0;
-	ui->ui_pr = IPPROTO_UDP;
-	ui->ui_len = htons(m->m_len - sizeof(struct ip));
-	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
-        ui->ui_src = saddr->sin_addr;
-	ui->ui_dst = daddr->sin_addr;
-	ui->ui_sport = saddr->sin_port;
-	ui->ui_dport = daddr->sin_port;
-	ui->ui_ulen = ui->ui_len;
-
-	/*
-	 * Stuff checksum and output datagram.
-	 */
-	ui->ui_sum = 0;
-	if ((ui->ui_sum = cksum(m, m->m_len)) == 0)
-		ui->ui_sum = 0xffff;
-	((struct ip *)ui)->ip_len = m->m_len;
-
-	((struct ip *)ui)->ip_ttl = IPDEFTTL;
-	((struct ip *)ui)->ip_tos = iptos;
-
-	error = ip_output(so, m);
-
-	return (error);
-}
-
-int
-udp_attach(struct socket *so, unsigned short af)
-{
-  so->s = slirp_socket(af, SOCK_DGRAM, 0);
-  if (so->s != -1) {
-    so->so_expire = curtime + SO_EXPIRE;
-    insque(so, &so->slirp->udb);
-  }
-  return(so->s);
-}
-
-void
-udp_detach(struct socket *so)
-{
-	so->slirp->cb->unregister_poll_fd(so->s, so->slirp->opaque);
-	closesocket(so->s);
-	sofree(so);
-}
-
-static const struct tos_t udptos[] = {
-	{0, 53, IPTOS_LOWDELAY, 0},			/* DNS */
-	{0, 0, 0, 0}
-};
-
-static uint8_t
-udp_tos(struct socket *so)
-{
-	int i = 0;
-
-	while(udptos[i].tos) {
-		if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) ||
-		    (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) {
-			so->so_emu = udptos[i].emu;
-			return udptos[i].tos;
-		}
-		i++;
-	}
-
-	return 0;
-}
-
-struct socket *
-udp_listen(Slirp *slirp, uint32_t haddr, unsigned hport, uint32_t laddr,
-           unsigned lport, int flags)
-{
-        /* TODO: IPv6 */
-	struct sockaddr_in addr;
-	struct socket *so;
-	socklen_t addrlen = sizeof(struct sockaddr_in);
-
-	so = socreate(slirp);
-	so->s = slirp_socket(AF_INET,SOCK_DGRAM,0);
-        if (so->s < 0) {
-            sofree(so);
-            return NULL;
-        }
-	so->so_expire = curtime + SO_EXPIRE;
-	insque(so, &slirp->udb);
-
-	addr.sin_family = AF_INET;
-	addr.sin_addr.s_addr = haddr;
-	addr.sin_port = hport;
-
-	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) {
-		udp_detach(so);
-		return NULL;
-	}
-	slirp_socket_set_fast_reuse(so->s);
-
-	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
-	so->fhost.sin = addr;
-	sotranslate_accept(so);
-	so->so_lfamily = AF_INET;
-	so->so_lport = lport;
-	so->so_laddr.s_addr = laddr;
-	if (flags != SS_FACCEPTONCE)
-	   so->so_expire = 0;
-
-	so->so_state &= SS_PERSISTENT_MASK;
-	so->so_state |= SS_ISFCONNECTED | flags;
-
-	return so;
-}
diff --git a/slirp/src/udp.h b/slirp/src/udp.h
deleted file mode 100644
index 29c0297..0000000
--- a/slirp/src/udp.h
+++ /dev/null
@@ -1,92 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1982, 1986, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)udp.h	8.1 (Berkeley) 6/10/93
- * udp.h,v 1.3 1994/08/21 05:27:41 paul Exp
- */
-
-#ifndef UDP_H
-#define UDP_H
-
-#define UDP_TTL 0x60
-#define UDP_UDPDATALEN 16192
-
-/*
- * Udp protocol header.
- * Per RFC 768, September, 1981.
- */
-struct udphdr {
-    uint16_t uh_sport;          /* source port */
-    uint16_t uh_dport;          /* destination port */
-    int16_t  uh_ulen;           /* udp length */
-    uint16_t uh_sum;            /* udp checksum */
-};
-
-/*
- * UDP kernel structures and variables.
- */
-struct udpiphdr {
-	        struct  ipovly ui_i;            /* overlaid ip structure */
-	        struct  udphdr ui_u;            /* udp header */
-};
-#define ui_mbuf         ui_i.ih_mbuf.mptr
-#define ui_x1           ui_i.ih_x1
-#define ui_pr           ui_i.ih_pr
-#define ui_len          ui_i.ih_len
-#define ui_src          ui_i.ih_src
-#define ui_dst          ui_i.ih_dst
-#define ui_sport        ui_u.uh_sport
-#define ui_dport        ui_u.uh_dport
-#define ui_ulen         ui_u.uh_ulen
-#define ui_sum          ui_u.uh_sum
-
-/*
- * Names for UDP sysctl objects
- */
-#define UDPCTL_CHECKSUM         1       /* checksum UDP packets */
-#define UDPCTL_MAXID            2
-
-struct mbuf;
-
-void udp_init(Slirp *);
-void udp_cleanup(Slirp *);
-void udp_input(register struct mbuf *, int);
-int udp_attach(struct socket *, unsigned short af);
-void udp_detach(struct socket *);
-struct socket * udp_listen(Slirp *, uint32_t, unsigned, uint32_t, unsigned,
-                           int);
-int udp_output(struct socket *so, struct mbuf *m,
-                struct sockaddr_in *saddr, struct sockaddr_in *daddr,
-                int iptos);
-
-void udp6_input(register struct mbuf *);
-int udp6_output(struct socket *so, struct mbuf *m,
-                struct sockaddr_in6 *saddr, struct sockaddr_in6 *daddr);
-
-#endif
diff --git a/slirp/src/udp6.c b/slirp/src/udp6.c
deleted file mode 100644
index bfcc7ec..0000000
--- a/slirp/src/udp6.c
+++ /dev/null
@@ -1,173 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 2013
- * Guillaume Subiron
- */
-
-#include "slirp.h"
-#include "udp.h"
-#include "dhcpv6.h"
-
-void udp6_input(struct mbuf *m)
-{
-    Slirp *slirp = m->slirp;
-    struct ip6 *ip, save_ip;
-    struct udphdr *uh;
-    int iphlen = sizeof(struct ip6);
-    int len;
-    struct socket *so;
-    struct sockaddr_in6 lhost;
-
-    DEBUG_CALL("udp6_input");
-    DEBUG_ARG("m = %p", m);
-
-    if (slirp->restricted) {
-        goto bad;
-    }
-
-    ip = mtod(m, struct ip6 *);
-    m->m_len -= iphlen;
-    m->m_data += iphlen;
-    uh = mtod(m, struct udphdr *);
-    m->m_len += iphlen;
-    m->m_data -= iphlen;
-
-    if (ip6_cksum(m)) {
-        goto bad;
-    }
-
-    len = ntohs((uint16_t)uh->uh_ulen);
-
-    /*
-     * Make mbuf data length reflect UDP length.
-     * If not enough data to reflect UDP length, drop.
-     */
-    if (ntohs(ip->ip_pl) != len) {
-        if (len > ntohs(ip->ip_pl)) {
-            goto bad;
-        }
-        m_adj(m, len - ntohs(ip->ip_pl));
-        ip->ip_pl = htons(len);
-    }
-
-    /*
-     * Save a copy of the IP header in case we want restore it
-     * for sending an ICMP error message in response.
-     */
-    save_ip = *ip;
-
-    /* Locate pcb for datagram. */
-    lhost.sin6_family = AF_INET6;
-    lhost.sin6_addr = ip->ip_src;
-    lhost.sin6_port = uh->uh_sport;
-
-    /* handle DHCPv6 */
-    if (ntohs(uh->uh_dport) == DHCPV6_SERVER_PORT &&
-        (in6_equal(&ip->ip_dst, &slirp->vhost_addr6) ||
-         in6_dhcp_multicast(&ip->ip_dst))) {
-        m->m_data += iphlen;
-        m->m_len -= iphlen;
-        dhcpv6_input(&lhost, m);
-        m->m_data -= iphlen;
-        m->m_len += iphlen;
-        goto bad;
-    }
-
-    /* handle TFTP */
-    if (ntohs(uh->uh_dport) == TFTP_SERVER &&
-        !memcmp(ip->ip_dst.s6_addr, slirp->vhost_addr6.s6_addr, 16)) {
-        m->m_data += iphlen;
-        m->m_len -= iphlen;
-        tftp_input((struct sockaddr_storage *)&lhost, m);
-        m->m_data -= iphlen;
-        m->m_len += iphlen;
-        goto bad;
-    }
-
-    so = solookup(&slirp->udp_last_so, &slirp->udb,
-                  (struct sockaddr_storage *) &lhost, NULL);
-
-    if (so == NULL) {
-        /* If there's no socket for this packet, create one. */
-        so = socreate(slirp);
-        if (udp_attach(so, AF_INET6) == -1) {
-            DEBUG_MISC(" udp6_attach errno = %d-%s", errno, strerror(errno));
-            sofree(so);
-            goto bad;
-        }
-
-        /* Setup fields */
-        so->so_lfamily = AF_INET6;
-        so->so_laddr6 = ip->ip_src;
-        so->so_lport6 = uh->uh_sport;
-    }
-
-    so->so_ffamily = AF_INET6;
-    so->so_faddr6 = ip->ip_dst; /* XXX */
-    so->so_fport6 = uh->uh_dport; /* XXX */
-
-    iphlen += sizeof(struct udphdr);
-    m->m_len -= iphlen;
-    m->m_data += iphlen;
-
-    /*
-     * Now we sendto() the packet.
-     */
-    if (sosendto(so, m) == -1) {
-        m->m_len += iphlen;
-        m->m_data -= iphlen;
-        *ip = save_ip;
-        DEBUG_MISC("udp tx errno = %d-%s", errno, strerror(errno));
-        icmp6_send_error(m, ICMP6_UNREACH, ICMP6_UNREACH_NO_ROUTE);
-        goto bad;
-    }
-
-    m_free(so->so_m);   /* used for ICMP if error on sorecvfrom */
-
-    /* restore the orig mbuf packet */
-    m->m_len += iphlen;
-    m->m_data -= iphlen;
-    *ip = save_ip;
-    so->so_m = m;
-
-    return;
-bad:
-    m_free(m);
-}
-
-int udp6_output(struct socket *so, struct mbuf *m,
-        struct sockaddr_in6 *saddr, struct sockaddr_in6 *daddr)
-{
-    struct ip6 *ip;
-    struct udphdr *uh;
-
-    DEBUG_CALL("udp6_output");
-    DEBUG_ARG("so = %p", so);
-    DEBUG_ARG("m = %p", m);
-
-    /* adjust for header */
-    m->m_data -= sizeof(struct udphdr);
-    m->m_len += sizeof(struct udphdr);
-    uh = mtod(m, struct udphdr *);
-    m->m_data -= sizeof(struct ip6);
-    m->m_len += sizeof(struct ip6);
-    ip = mtod(m, struct ip6 *);
-
-    /* Build IP header */
-    ip->ip_pl = htons(m->m_len - sizeof(struct ip6));
-    ip->ip_nh = IPPROTO_UDP;
-    ip->ip_src = saddr->sin6_addr;
-    ip->ip_dst = daddr->sin6_addr;
-
-    /* Build UDP header */
-    uh->uh_sport = saddr->sin6_port;
-    uh->uh_dport = daddr->sin6_port;
-    uh->uh_ulen = ip->ip_pl;
-    uh->uh_sum = 0;
-    uh->uh_sum = ip6_cksum(m);
-    if (uh->uh_sum == 0) {
-        uh->uh_sum = 0xffff;
-    }
-
-    return ip6_output(so, m, 0);
-}
diff --git a/slirp/src/util.c b/slirp/src/util.c
deleted file mode 100644
index 60bb200..0000000
--- a/slirp/src/util.c
+++ /dev/null
@@ -1,368 +0,0 @@
-/* SPDX-License-Identifier: MIT */
-/*
- * util.c (mostly based on QEMU os-win32.c)
- *
- * Copyright (c) 2003-2008 Fabrice Bellard
- * Copyright (c) 2010-2016 Red Hat, Inc.
- *
- * QEMU library functions for win32 which are shared between QEMU and
- * the QEMU tools.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-#include "util.h"
-
-#include <glib.h>
-#include <fcntl.h>
-#include <stdint.h>
-
-#if defined(_WIN32)
-int slirp_inet_aton(const char *cp, struct in_addr *ia)
-{
-    uint32_t addr = inet_addr(cp);
-    if (addr == 0xffffffff) {
-        return 0;
-    }
-    ia->s_addr = addr;
-    return 1;
-}
-#endif
-
-void slirp_set_nonblock(int fd)
-{
-#ifndef _WIN32
-    int f;
-    f = fcntl(fd, F_GETFL);
-    assert(f != -1);
-    f = fcntl(fd, F_SETFL, f | O_NONBLOCK);
-    assert(f != -1);
-#else
-    unsigned long opt = 1;
-    ioctlsocket(fd, FIONBIO, &opt);
-#endif
-}
-
-static void slirp_set_cloexec(int fd)
-{
-#ifndef _WIN32
-    int f;
-    f = fcntl(fd, F_GETFD);
-    assert(f != -1);
-    f = fcntl(fd, F_SETFD, f | FD_CLOEXEC);
-    assert(f != -1);
-#endif
-}
-
-/*
- * Opens a socket with FD_CLOEXEC set
- */
-int slirp_socket(int domain, int type, int protocol)
-{
-    int ret;
-
-#ifdef SOCK_CLOEXEC
-    ret = socket(domain, type | SOCK_CLOEXEC, protocol);
-    if (ret != -1 || errno != EINVAL) {
-        return ret;
-    }
-#endif
-    ret = socket(domain, type, protocol);
-    if (ret >= 0) {
-        slirp_set_cloexec(ret);
-    }
-
-    return ret;
-}
-
-#ifdef _WIN32
-static int socket_error(void)
-{
-    switch (WSAGetLastError()) {
-    case 0:
-        return 0;
-    case WSAEINTR:
-        return EINTR;
-    case WSAEINVAL:
-        return EINVAL;
-    case WSA_INVALID_HANDLE:
-        return EBADF;
-    case WSA_NOT_ENOUGH_MEMORY:
-        return ENOMEM;
-    case WSA_INVALID_PARAMETER:
-        return EINVAL;
-    case WSAENAMETOOLONG:
-        return ENAMETOOLONG;
-    case WSAENOTEMPTY:
-        return ENOTEMPTY;
-    case WSAEWOULDBLOCK:
-         /* not using EWOULDBLOCK as we don't want code to have
-          * to check both EWOULDBLOCK and EAGAIN */
-        return EAGAIN;
-    case WSAEINPROGRESS:
-        return EINPROGRESS;
-    case WSAEALREADY:
-        return EALREADY;
-    case WSAENOTSOCK:
-        return ENOTSOCK;
-    case WSAEDESTADDRREQ:
-        return EDESTADDRREQ;
-    case WSAEMSGSIZE:
-        return EMSGSIZE;
-    case WSAEPROTOTYPE:
-        return EPROTOTYPE;
-    case WSAENOPROTOOPT:
-        return ENOPROTOOPT;
-    case WSAEPROTONOSUPPORT:
-        return EPROTONOSUPPORT;
-    case WSAEOPNOTSUPP:
-        return EOPNOTSUPP;
-    case WSAEAFNOSUPPORT:
-        return EAFNOSUPPORT;
-    case WSAEADDRINUSE:
-        return EADDRINUSE;
-    case WSAEADDRNOTAVAIL:
-        return EADDRNOTAVAIL;
-    case WSAENETDOWN:
-        return ENETDOWN;
-    case WSAENETUNREACH:
-        return ENETUNREACH;
-    case WSAENETRESET:
-        return ENETRESET;
-    case WSAECONNABORTED:
-        return ECONNABORTED;
-    case WSAECONNRESET:
-        return ECONNRESET;
-    case WSAENOBUFS:
-        return ENOBUFS;
-    case WSAEISCONN:
-        return EISCONN;
-    case WSAENOTCONN:
-        return ENOTCONN;
-    case WSAETIMEDOUT:
-        return ETIMEDOUT;
-    case WSAECONNREFUSED:
-        return ECONNREFUSED;
-    case WSAELOOP:
-        return ELOOP;
-    case WSAEHOSTUNREACH:
-        return EHOSTUNREACH;
-    default:
-        return EIO;
-    }
-}
-
-#undef ioctlsocket
-int slirp_ioctlsocket_wrap(int fd, int req, void *val)
-{
-    int ret;
-    ret = ioctlsocket(fd, req, val);
-    if (ret < 0) {
-        errno = socket_error();
-    }
-    return ret;
-}
-
-#undef closesocket
-int slirp_closesocket_wrap(int fd)
-{
-    int ret;
-    ret = closesocket(fd);
-    if (ret < 0) {
-        errno = socket_error();
-    }
-    return ret;
-}
-
-#undef connect
-int slirp_connect_wrap(int sockfd, const struct sockaddr *addr, int addrlen)
-{
-    int ret;
-    ret = connect(sockfd, addr, addrlen);
-    if (ret < 0) {
-        errno = socket_error();
-    }
-    return ret;
-}
-
-#undef listen
-int slirp_listen_wrap(int sockfd, int backlog)
-{
-    int ret;
-    ret = listen(sockfd, backlog);
-    if (ret < 0) {
-        errno = socket_error();
-    }
-    return ret;
-}
-
-#undef bind
-int slirp_bind_wrap(int sockfd, const struct sockaddr *addr, int addrlen)
-{
-    int ret;
-    ret = bind(sockfd, addr, addrlen);
-    if (ret < 0) {
-        errno = socket_error();
-    }
-    return ret;
-}
-
-#undef socket
-int slirp_socket_wrap(int domain, int type, int protocol)
-{
-    int ret;
-    ret = socket(domain, type, protocol);
-    if (ret < 0) {
-        errno = socket_error();
-    }
-    return ret;
-}
-
-#undef accept
-int slirp_accept_wrap(int sockfd, struct sockaddr *addr, int *addrlen)
-{
-    int ret;
-    ret = accept(sockfd, addr, addrlen);
-    if (ret < 0) {
-        errno = socket_error();
-    }
-    return ret;
-}
-
-#undef shutdown
-int slirp_shutdown_wrap(int sockfd, int how)
-{
-    int ret;
-    ret = shutdown(sockfd, how);
-    if (ret < 0) {
-        errno = socket_error();
-    }
-    return ret;
-}
-
-#undef getsockopt
-int slirp_getsockopt_wrap(int sockfd, int level, int optname,
-                          void *optval, int *optlen)
-{
-    int ret;
-    ret = getsockopt(sockfd, level, optname, optval, optlen);
-    if (ret < 0) {
-        errno = socket_error();
-    }
-    return ret;
-}
-
-#undef setsockopt
-int slirp_setsockopt_wrap(int sockfd, int level, int optname,
-                          const void *optval, int optlen)
-{
-    int ret;
-    ret = setsockopt(sockfd, level, optname, optval, optlen);
-    if (ret < 0) {
-        errno = socket_error();
-    }
-    return ret;
-}
-
-#undef getpeername
-int slirp_getpeername_wrap(int sockfd, struct sockaddr *addr,
-                           int *addrlen)
-{
-    int ret;
-    ret = getpeername(sockfd, addr, addrlen);
-    if (ret < 0) {
-        errno = socket_error();
-    }
-    return ret;
-}
-
-#undef getsockname
-int slirp_getsockname_wrap(int sockfd, struct sockaddr *addr,
-                           int *addrlen)
-{
-    int ret;
-    ret = getsockname(sockfd, addr, addrlen);
-    if (ret < 0) {
-        errno = socket_error();
-    }
-    return ret;
-}
-
-#undef send
-ssize_t slirp_send_wrap(int sockfd, const void *buf, size_t len, int flags)
-{
-    int ret;
-    ret = send(sockfd, buf, len, flags);
-    if (ret < 0) {
-        errno = socket_error();
-    }
-    return ret;
-}
-
-#undef sendto
-ssize_t slirp_sendto_wrap(int sockfd, const void *buf, size_t len, int flags,
-                     const struct sockaddr *addr, int addrlen)
-{
-    int ret;
-    ret = sendto(sockfd, buf, len, flags, addr, addrlen);
-    if (ret < 0) {
-        errno = socket_error();
-    }
-    return ret;
-}
-
-#undef recv
-ssize_t slirp_recv_wrap(int sockfd, void *buf, size_t len, int flags)
-{
-    int ret;
-    ret = recv(sockfd, buf, len, flags);
-    if (ret < 0) {
-        errno = socket_error();
-    }
-    return ret;
-}
-
-#undef recvfrom
-ssize_t slirp_recvfrom_wrap(int sockfd, void *buf, size_t len, int flags,
-                            struct sockaddr *addr, int *addrlen)
-{
-    int ret;
-    ret = recvfrom(sockfd, buf, len, flags, addr, addrlen);
-    if (ret < 0) {
-        errno = socket_error();
-    }
-    return ret;
-}
-#endif /* WIN32 */
-
-void slirp_pstrcpy(char *buf, int buf_size, const char *str)
-{
-    int c;
-    char *q = buf;
-
-    if (buf_size <= 0)
-        return;
-
-    for(;;) {
-        c = *str++;
-        if (c == 0 || q >= buf + buf_size - 1)
-            break;
-        *q++ = c;
-    }
-    *q = '\0';
-}
diff --git a/slirp/src/util.h b/slirp/src/util.h
deleted file mode 100644
index 01f1e0e..0000000
--- a/slirp/src/util.h
+++ /dev/null
@@ -1,175 +0,0 @@
-/* SPDX-License-Identifier: MIT */
-/*
- * Copyright (c) 2003-2008 Fabrice Bellard
- * Copyright (c) 2010-2019 Red Hat, Inc.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-#ifndef UTIL_H_
-#define UTIL_H_
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <assert.h>
-#include <errno.h>
-#include <unistd.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <inttypes.h>
-
-#ifdef _WIN32
-#include <winsock2.h>
-#include <windows.h>
-#else
-#include <sys/socket.h>
-#include <netinet/tcp.h>
-#include <netinet/in.h>
-#endif
-
-#if defined(_WIN32)
-# define SLIRP_PACKED __attribute__((gcc_struct, packed))
-#else
-# define SLIRP_PACKED __attribute__((packed))
-#endif
-
-#ifndef DIV_ROUND_UP
-#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
-#endif
-
-#ifndef container_of
-#define container_of(ptr, type, member) __extension__ ({    \
-    void *__mptr = (void *)(ptr);               \
-    ((type *)(__mptr - offsetof(type, member))); })
-#endif
-
-#if defined(_WIN32) /* CONFIG_IOVEC */
-# if !defined(IOV_MAX) /* XXX: to avoid duplicate with QEMU osdep.h */
-struct iovec {
-    void *iov_base;
-    size_t iov_len;
-};
-# endif
-#else
-#include <sys/uio.h>
-#endif
-
-#define SCALE_MS 1000000
-
-#define ETH_ALEN    6
-#define ETH_HLEN    14
-#define ETH_P_IP                  (0x0800)      /* Internet Protocol packet  */
-#define ETH_P_ARP                 (0x0806)      /* Address Resolution packet */
-#define ETH_P_IPV6                (0x86dd)
-#define ETH_P_VLAN                (0x8100)
-#define ETH_P_DVLAN               (0x88a8)
-#define ETH_P_NCSI                (0x88f8)
-#define ETH_P_UNKNOWN             (0xffff)
-
-/* FIXME: remove me when made standalone */
-#ifdef _WIN32
-#undef accept
-#undef bind
-#undef closesocket
-#undef connect
-#undef getpeername
-#undef getsockname
-#undef getsockopt
-#undef ioctlsocket
-#undef listen
-#undef recv
-#undef recvfrom
-#undef send
-#undef sendto
-#undef setsockopt
-#undef shutdown
-#undef socket
-#endif
-
-#ifdef _WIN32
-#define connect slirp_connect_wrap
-int slirp_connect_wrap(int fd, const struct sockaddr *addr, int addrlen);
-#define listen slirp_listen_wrap
-int slirp_listen_wrap(int fd, int backlog);
-#define bind slirp_bind_wrap
-int slirp_bind_wrap(int fd, const struct sockaddr *addr, int addrlen);
-#define socket slirp_socket_wrap
-int slirp_socket_wrap(int domain, int type, int protocol);
-#define accept slirp_accept_wrap
-int slirp_accept_wrap(int fd, struct sockaddr *addr, int *addrlen);
-#define shutdown slirp_shutdown_wrap
-int slirp_shutdown_wrap(int fd, int how);
-#define getpeername slirp_getpeername_wrap
-int slirp_getpeername_wrap(int fd, struct sockaddr *addr, int *addrlen);
-#define getsockname slirp_getsockname_wrap
-int slirp_getsockname_wrap(int fd, struct sockaddr *addr, int *addrlen);
-#define send slirp_send_wrap
-ssize_t slirp_send_wrap(int fd, const void *buf, size_t len, int flags);
-#define sendto slirp_sendto_wrap
-ssize_t slirp_sendto_wrap(int fd, const void *buf, size_t len, int flags,
-                          const struct sockaddr *dest_addr, int addrlen);
-#define recv slirp_recv_wrap
-ssize_t slirp_recv_wrap(int fd, void *buf, size_t len, int flags);
-#define recvfrom slirp_recvfrom_wrap
-ssize_t slirp_recvfrom_wrap(int fd, void *buf, size_t len, int flags,
-                            struct sockaddr *src_addr, int *addrlen);
-#define closesocket slirp_closesocket_wrap
-int slirp_closesocket_wrap(int fd);
-#define ioctlsocket slirp_ioctlsocket_wrap
-int slirp_ioctlsocket_wrap(int fd, int req, void *val);
-#define getsockopt slirp_getsockopt_wrap
-int slirp_getsockopt_wrap(int sockfd, int level, int optname,
-                     void *optval, int *optlen);
-#define setsockopt slirp_setsockopt_wrap
-int slirp_setsockopt_wrap(int sockfd, int level, int optname,
-                          const void *optval, int optlen);
-#define inet_aton slirp_inet_aton
-int slirp_inet_aton(const char *cp, struct in_addr *ia);
-#else
-#define closesocket(s) close(s)
-#define ioctlsocket(s, r, v) ioctl(s, r, v)
-#endif
-
-int slirp_socket(int domain, int type, int protocol);
-void slirp_set_nonblock(int fd);
-
-static inline int slirp_socket_set_nodelay(int fd)
-{
-    int v = 1;
-    return setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &v, sizeof(v));
-}
-
-static inline int slirp_socket_set_fast_reuse(int fd)
-{
-#ifndef _WIN32
-    int v = 1;
-    return setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v));
-#else
-    /* Enabling the reuse of an endpoint that was used by a socket still in
-     * TIME_WAIT state is usually performed by setting SO_REUSEADDR. On Windows
-     * fast reuse is the default and SO_REUSEADDR does strange things. So we
-     * don't have to do anything here. More info can be found at:
-     * http://msdn.microsoft.com/en-us/library/windows/desktop/ms740621.aspx */
-    return 0;
-#endif
-}
-
-void slirp_pstrcpy(char *buf, int buf_size, const char *str);
-
-#endif
diff --git a/slirp/src/vmstate.c b/slirp/src/vmstate.c
deleted file mode 100644
index 43bb3eb..0000000
--- a/slirp/src/vmstate.c
+++ /dev/null
@@ -1,441 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * VMState interpreter
- *
- * Copyright (c) 2009-2018 Red Hat Inc
- *
- * Authors:
- *  Juan Quintela <quintela@redhat.com>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above
- * copyright notice, this list of conditions and the following
- * disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * 3. Neither the name of the copyright holder nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
- * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#include <assert.h>
-#include <errno.h>
-#include <string.h>
-#include <glib.h>
-
-#include "stream.h"
-#include "vmstate.h"
-
-static int get_nullptr(SlirpIStream *f, void *pv, size_t size,
-                       const VMStateField *field)
-{
-    if (slirp_istream_read_u8(f) == VMS_NULLPTR_MARKER) {
-        return  0;
-    }
-    g_warning("vmstate: get_nullptr expected VMS_NULLPTR_MARKER");
-    return -EINVAL;
-}
-
-static int put_nullptr(SlirpOStream *f, void *pv, size_t size,
-                       const VMStateField *field)
-
-{
-    if (pv == NULL) {
-        slirp_ostream_write_u8(f, VMS_NULLPTR_MARKER);
-        return 0;
-    }
-    g_warning("vmstate: put_nullptr must be called with pv == NULL");
-    return -EINVAL;
-}
-
-const VMStateInfo slirp_vmstate_info_nullptr = {
-    .name = "uint64",
-    .get  = get_nullptr,
-    .put  = put_nullptr,
-};
-
-/* 8 bit unsigned int */
-
-static int get_uint8(SlirpIStream *f, void *pv, size_t size, const VMStateField *field)
-{
-    uint8_t *v = pv;
-    *v = slirp_istream_read_u8(f);
-    return 0;
-}
-
-static int put_uint8(SlirpOStream *f, void *pv, size_t size, const VMStateField *field)
-{
-    uint8_t *v = pv;
-    slirp_ostream_write_u8(f, *v);
-    return 0;
-}
-
-const VMStateInfo slirp_vmstate_info_uint8 = {
-    .name = "uint8",
-    .get  = get_uint8,
-    .put  = put_uint8,
-};
-
-/* 16 bit unsigned int */
-
-static int get_uint16(SlirpIStream *f, void *pv, size_t size,
-                      const VMStateField *field)
-{
-    uint16_t *v = pv;
-    *v = slirp_istream_read_u16(f);
-    return 0;
-}
-
-static int put_uint16(SlirpOStream *f, void *pv, size_t size,
-                      const VMStateField *field)
-{
-    uint16_t *v = pv;
-    slirp_ostream_write_u16(f, *v);
-    return 0;
-}
-
-const VMStateInfo slirp_vmstate_info_uint16 = {
-    .name = "uint16",
-    .get  = get_uint16,
-    .put  = put_uint16,
-};
-
-/* 32 bit unsigned int */
-
-static int get_uint32(SlirpIStream *f, void *pv, size_t size,
-                      const VMStateField *field)
-{
-    uint32_t *v = pv;
-    *v = slirp_istream_read_u32(f);
-    return 0;
-}
-
-static int put_uint32(SlirpOStream *f, void *pv, size_t size,
-                      const VMStateField *field)
-{
-    uint32_t *v = pv;
-    slirp_ostream_write_u32(f, *v);
-    return 0;
-}
-
-const VMStateInfo slirp_vmstate_info_uint32 = {
-    .name = "uint32",
-    .get  = get_uint32,
-    .put  = put_uint32,
-};
-
-/* 16 bit int */
-
-static int get_int16(SlirpIStream *f, void *pv, size_t size, const VMStateField *field)
-{
-    int16_t *v = pv;
-    *v = slirp_istream_read_i16(f);
-    return 0;
-}
-
-static int put_int16(SlirpOStream *f, void *pv, size_t size, const VMStateField *field)
-{
-    int16_t *v = pv;
-    slirp_ostream_write_i16(f, *v);
-    return 0;
-}
-
-const VMStateInfo slirp_vmstate_info_int16 = {
-    .name = "int16",
-    .get  = get_int16,
-    .put  = put_int16,
-};
-
-/* 32 bit int */
-
-static int get_int32(SlirpIStream *f, void *pv, size_t size, const VMStateField *field)
-{
-    int32_t *v = pv;
-    *v = slirp_istream_read_i32(f);
-    return 0;
-}
-
-static int put_int32(SlirpOStream *f, void *pv, size_t size, const VMStateField *field)
-{
-    int32_t *v = pv;
-    slirp_ostream_write_i32(f, *v);
-    return 0;
-}
-
-const VMStateInfo slirp_vmstate_info_int32 = {
-    .name = "int32",
-    .get  = get_int32,
-    .put  = put_int32,
-};
-
-/* vmstate_info_tmp, see VMSTATE_WITH_TMP, the idea is that we allocate
- * a temporary buffer and the pre_load/pre_save methods in the child vmsd
- * copy stuff from the parent into the child and do calculations to fill
- * in fields that don't really exist in the parent but need to be in the
- * stream.
- */
-static int get_tmp(SlirpIStream *f, void *pv, size_t size, const VMStateField *field)
-{
-    int ret;
-    const VMStateDescription *vmsd = field->vmsd;
-    int version_id = field->version_id;
-    void *tmp = g_malloc(size);
-
-    /* Writes the parent field which is at the start of the tmp */
-    *(void **)tmp = pv;
-    ret = slirp_vmstate_load_state(f, vmsd, tmp, version_id);
-    g_free(tmp);
-    return ret;
-}
-
-static int put_tmp(SlirpOStream *f, void *pv, size_t size, const VMStateField *field)
-{
-    const VMStateDescription *vmsd = field->vmsd;
-    void *tmp = g_malloc(size);
-    int ret;
-
-    /* Writes the parent field which is at the start of the tmp */
-    *(void **)tmp = pv;
-    ret = slirp_vmstate_save_state(f, vmsd, tmp);
-    g_free(tmp);
-
-    return ret;
-}
-
-const VMStateInfo slirp_vmstate_info_tmp = {
-    .name = "tmp",
-    .get = get_tmp,
-    .put = put_tmp,
-};
-
-/* uint8_t buffers */
-
-static int get_buffer(SlirpIStream *f, void *pv, size_t size,
-                      const VMStateField *field)
-{
-    slirp_istream_read(f, pv, size);
-    return 0;
-}
-
-static int put_buffer(SlirpOStream *f, void *pv, size_t size,
-                      const VMStateField *field)
-{
-    slirp_ostream_write(f, pv, size);
-    return 0;
-}
-
-const VMStateInfo slirp_vmstate_info_buffer = {
-    .name = "buffer",
-    .get  = get_buffer,
-    .put  = put_buffer,
-};
-
-static int vmstate_n_elems(void *opaque, const VMStateField *field)
-{
-    int n_elems = 1;
-
-    if (field->flags & VMS_ARRAY) {
-        n_elems = field->num;
-    } else if (field->flags & VMS_VARRAY_INT32) {
-        n_elems = *(int32_t *)(opaque + field->num_offset);
-    } else if (field->flags & VMS_VARRAY_UINT32) {
-        n_elems = *(uint32_t *)(opaque + field->num_offset);
-    } else if (field->flags & VMS_VARRAY_UINT16) {
-        n_elems = *(uint16_t *)(opaque + field->num_offset);
-    } else if (field->flags & VMS_VARRAY_UINT8) {
-        n_elems = *(uint8_t *)(opaque + field->num_offset);
-    }
-
-    if (field->flags & VMS_MULTIPLY_ELEMENTS) {
-        n_elems *= field->num;
-    }
-
-    return n_elems;
-}
-
-static int vmstate_size(void *opaque, const VMStateField *field)
-{
-    int size = field->size;
-
-    if (field->flags & VMS_VBUFFER) {
-        size = *(int32_t *)(opaque + field->size_offset);
-        if (field->flags & VMS_MULTIPLY) {
-            size *= field->size;
-        }
-    }
-
-    return size;
-}
-
-static int
-vmstate_save_state_v(SlirpOStream *f, const VMStateDescription *vmsd,
-                     void *opaque, int version_id)
-{
-    int ret = 0;
-    const VMStateField *field = vmsd->fields;
-
-    if (vmsd->pre_save) {
-        ret = vmsd->pre_save(opaque);
-        if (ret) {
-            g_warning("pre-save failed: %s", vmsd->name);
-            return ret;
-        }
-    }
-
-    while (field->name) {
-        if ((field->field_exists &&
-             field->field_exists(opaque, version_id)) ||
-            (!field->field_exists &&
-             field->version_id <= version_id)) {
-            void *first_elem = opaque + field->offset;
-            int i, n_elems = vmstate_n_elems(opaque, field);
-            int size = vmstate_size(opaque, field);
-
-            if (field->flags & VMS_POINTER) {
-                first_elem = *(void **)first_elem;
-                assert(first_elem || !n_elems || !size);
-            }
-            for (i = 0; i < n_elems; i++) {
-                void *curr_elem = first_elem + size * i;
-                ret = 0;
-
-                if (field->flags & VMS_ARRAY_OF_POINTER) {
-                    assert(curr_elem);
-                    curr_elem = *(void **)curr_elem;
-                }
-                if (!curr_elem && size) {
-                    /* if null pointer write placeholder and do not follow */
-                    assert(field->flags & VMS_ARRAY_OF_POINTER);
-                    ret = slirp_vmstate_info_nullptr.put(f, curr_elem, size, NULL);
-                } else if (field->flags & VMS_STRUCT) {
-                    ret = slirp_vmstate_save_state(f, field->vmsd, curr_elem);
-                } else if (field->flags & VMS_VSTRUCT) {
-                    ret = vmstate_save_state_v(f, field->vmsd, curr_elem,
-                                               field->struct_version_id);
-                } else {
-                    ret = field->info->put(f, curr_elem, size, field);
-                }
-                if (ret) {
-                    g_warning("Save of field %s/%s failed",
-                              vmsd->name, field->name);
-                    return ret;
-                }
-            }
-        } else {
-            if (field->flags & VMS_MUST_EXIST) {
-                g_warning("Output state validation failed: %s/%s",
-                          vmsd->name, field->name);
-                assert(!(field->flags & VMS_MUST_EXIST));
-            }
-        }
-        field++;
-    }
-
-    return 0;
-}
-
-int slirp_vmstate_save_state(SlirpOStream *f, const VMStateDescription *vmsd,
-                             void *opaque)
-{
-    return vmstate_save_state_v(f, vmsd, opaque, vmsd->version_id);
-}
-
-static void vmstate_handle_alloc(void *ptr, VMStateField *field, void *opaque)
-{
-    if (field->flags & VMS_POINTER && field->flags & VMS_ALLOC) {
-        size_t size = vmstate_size(opaque, field);
-        size *= vmstate_n_elems(opaque, field);
-        if (size) {
-            *(void **)ptr = g_malloc(size);
-        }
-    }
-}
-
-int slirp_vmstate_load_state(SlirpIStream *f, const VMStateDescription *vmsd,
-                             void *opaque, int version_id)
-{
-    VMStateField *field = vmsd->fields;
-    int ret = 0;
-
-    if (version_id > vmsd->version_id) {
-        g_warning("%s: incoming version_id %d is too new "
-                  "for local version_id %d",
-                  vmsd->name, version_id, vmsd->version_id);
-        return -EINVAL;
-    }
-    if (vmsd->pre_load) {
-        int ret = vmsd->pre_load(opaque);
-        if (ret) {
-            return ret;
-        }
-    }
-    while (field->name) {
-        if ((field->field_exists &&
-             field->field_exists(opaque, version_id)) ||
-            (!field->field_exists &&
-             field->version_id <= version_id)) {
-            void *first_elem = opaque + field->offset;
-            int i, n_elems = vmstate_n_elems(opaque, field);
-            int size = vmstate_size(opaque, field);
-
-            vmstate_handle_alloc(first_elem, field, opaque);
-            if (field->flags & VMS_POINTER) {
-                first_elem = *(void **)first_elem;
-                assert(first_elem || !n_elems || !size);
-            }
-            for (i = 0; i < n_elems; i++) {
-                void *curr_elem = first_elem + size * i;
-
-                if (field->flags & VMS_ARRAY_OF_POINTER) {
-                    curr_elem = *(void **)curr_elem;
-                }
-                if (!curr_elem && size) {
-                    /* if null pointer check placeholder and do not follow */
-                    assert(field->flags & VMS_ARRAY_OF_POINTER);
-                    ret = slirp_vmstate_info_nullptr.get(f, curr_elem, size, NULL);
-                } else if (field->flags & VMS_STRUCT) {
-                    ret = slirp_vmstate_load_state(f, field->vmsd, curr_elem,
-                                             field->vmsd->version_id);
-                } else if (field->flags & VMS_VSTRUCT) {
-                    ret = slirp_vmstate_load_state(f, field->vmsd, curr_elem,
-                                             field->struct_version_id);
-                } else {
-                    ret = field->info->get(f, curr_elem, size, field);
-                }
-                if (ret < 0) {
-                    g_warning("Failed to load %s:%s", vmsd->name,
-                              field->name);
-                    return ret;
-                }
-            }
-        } else if (field->flags & VMS_MUST_EXIST) {
-            g_warning("Input validation failed: %s/%s",
-                      vmsd->name, field->name);
-            return -1;
-        }
-        field++;
-    }
-    if (vmsd->post_load) {
-        ret = vmsd->post_load(opaque, version_id);
-    }
-    return ret;
-}
diff --git a/slirp/src/vmstate.h b/slirp/src/vmstate.h
deleted file mode 100644
index 44efea7..0000000
--- a/slirp/src/vmstate.h
+++ /dev/null
@@ -1,409 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * QEMU migration/snapshot declarations
- *
- * Copyright (c) 2009-2011 Red Hat, Inc.
- *
- * Original author: Juan Quintela <quintela@redhat.com>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above
- * copyright notice, this list of conditions and the following
- * disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * 3. Neither the name of the copyright holder nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
- * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#ifndef VMSTATE_H_
-#define VMSTATE_H_
-
-#include <unistd.h>
-#include <stdint.h>
-#include <stdbool.h>
-#include "slirp.h"
-#include "stream.h"
-
-#define stringify(s) tostring(s)
-#define tostring(s) #s
-
-typedef struct VMStateInfo VMStateInfo;
-typedef struct VMStateDescription VMStateDescription;
-typedef struct VMStateField VMStateField;
-
-int slirp_vmstate_save_state(SlirpOStream *f, const VMStateDescription *vmsd,
-                             void *opaque);
-int slirp_vmstate_load_state(SlirpIStream *f, const VMStateDescription *vmsd,
-                             void *opaque, int version_id);
-
-/* VMStateInfo allows customized migration of objects that don't fit in
- * any category in VMStateFlags. Additional information is always passed
- * into get and put in terms of field and vmdesc parameters. However
- * these two parameters should only be used in cases when customized
- * handling is needed, such as QTAILQ. For primitive data types such as
- * integer, field and vmdesc parameters should be ignored inside get/put.
- */
-struct VMStateInfo {
-    const char *name;
-    int (*get)(SlirpIStream *f, void *pv, size_t size, const VMStateField *field);
-    int (*put)(SlirpOStream *f, void *pv, size_t size, const VMStateField *field);
-};
-
-enum VMStateFlags {
-    /* Ignored */
-    VMS_SINGLE           = 0x001,
-
-    /* The struct member at opaque + VMStateField.offset is a pointer
-     * to the actual field (e.g. struct a { uint8_t *b;
-     * }). Dereference the pointer before using it as basis for
-     * further pointer arithmetic (see e.g. VMS_ARRAY). Does not
-     * affect the meaning of VMStateField.num_offset or
-     * VMStateField.size_offset; see VMS_VARRAY* and VMS_VBUFFER for
-     * those. */
-    VMS_POINTER          = 0x002,
-
-    /* The field is an array of fixed size. VMStateField.num contains
-     * the number of entries in the array. The size of each entry is
-     * given by VMStateField.size and / or opaque +
-     * VMStateField.size_offset; see VMS_VBUFFER and
-     * VMS_MULTIPLY. Each array entry will be processed individually
-     * (VMStateField.info.get()/put() if VMS_STRUCT is not set,
-     * recursion into VMStateField.vmsd if VMS_STRUCT is set). May not
-     * be combined with VMS_VARRAY*. */
-    VMS_ARRAY            = 0x004,
-
-    /* The field is itself a struct, containing one or more
-     * fields. Recurse into VMStateField.vmsd. Most useful in
-     * combination with VMS_ARRAY / VMS_VARRAY*, recursing into each
-     * array entry. */
-    VMS_STRUCT           = 0x008,
-
-    /* The field is an array of variable size. The int32_t at opaque +
-     * VMStateField.num_offset contains the number of entries in the
-     * array. See the VMS_ARRAY description regarding array handling
-     * in general. May not be combined with VMS_ARRAY or any other
-     * VMS_VARRAY*. */
-    VMS_VARRAY_INT32     = 0x010,
-
-    /* Ignored */
-    VMS_BUFFER           = 0x020,
-
-    /* The field is a (fixed-size or variable-size) array of pointers
-     * (e.g. struct a { uint8_t *b[]; }). Dereference each array entry
-     * before using it. Note: Does not imply any one of VMS_ARRAY /
-     * VMS_VARRAY*; these need to be set explicitly. */
-    VMS_ARRAY_OF_POINTER = 0x040,
-
-    /* The field is an array of variable size. The uint16_t at opaque
-     * + VMStateField.num_offset (subject to VMS_MULTIPLY_ELEMENTS)
-     * contains the number of entries in the array. See the VMS_ARRAY
-     * description regarding array handling in general. May not be
-     * combined with VMS_ARRAY or any other VMS_VARRAY*. */
-    VMS_VARRAY_UINT16    = 0x080,
-
-    /* The size of the individual entries (a single array entry if
-     * VMS_ARRAY or any of VMS_VARRAY* are set, or the field itself if
-     * neither is set) is variable (i.e. not known at compile-time),
-     * but the same for all entries. Use the int32_t at opaque +
-     * VMStateField.size_offset (subject to VMS_MULTIPLY) to determine
-     * the size of each (and every) entry. */
-    VMS_VBUFFER          = 0x100,
-
-    /* Multiply the entry size given by the int32_t at opaque +
-     * VMStateField.size_offset (see VMS_VBUFFER description) with
-     * VMStateField.size to determine the number of bytes to be
-     * allocated. Only valid in combination with VMS_VBUFFER. */
-    VMS_MULTIPLY         = 0x200,
-
-    /* The field is an array of variable size. The uint8_t at opaque +
-     * VMStateField.num_offset (subject to VMS_MULTIPLY_ELEMENTS)
-     * contains the number of entries in the array. See the VMS_ARRAY
-     * description regarding array handling in general. May not be
-     * combined with VMS_ARRAY or any other VMS_VARRAY*. */
-    VMS_VARRAY_UINT8     = 0x400,
-
-    /* The field is an array of variable size. The uint32_t at opaque
-     * + VMStateField.num_offset (subject to VMS_MULTIPLY_ELEMENTS)
-     * contains the number of entries in the array. See the VMS_ARRAY
-     * description regarding array handling in general. May not be
-     * combined with VMS_ARRAY or any other VMS_VARRAY*. */
-    VMS_VARRAY_UINT32    = 0x800,
-
-    /* Fail loading the serialised VM state if this field is missing
-     * from the input. */
-    VMS_MUST_EXIST       = 0x1000,
-
-    /* When loading serialised VM state, allocate memory for the
-     * (entire) field. Only valid in combination with
-     * VMS_POINTER. Note: Not all combinations with other flags are
-     * currently supported, e.g. VMS_ALLOC|VMS_ARRAY_OF_POINTER won't
-     * cause the individual entries to be allocated. */
-    VMS_ALLOC            = 0x2000,
-
-    /* Multiply the number of entries given by the integer at opaque +
-     * VMStateField.num_offset (see VMS_VARRAY*) with VMStateField.num
-     * to determine the number of entries in the array. Only valid in
-     * combination with one of VMS_VARRAY*. */
-    VMS_MULTIPLY_ELEMENTS = 0x4000,
-
-    /* A structure field that is like VMS_STRUCT, but uses
-     * VMStateField.struct_version_id to tell which version of the
-     * structure we are referencing to use. */
-    VMS_VSTRUCT           = 0x8000,
-};
-
-struct VMStateField {
-    const char *name;
-    size_t offset;
-    size_t size;
-    size_t start;
-    int num;
-    size_t num_offset;
-    size_t size_offset;
-    const VMStateInfo *info;
-    enum VMStateFlags flags;
-    const VMStateDescription *vmsd;
-    int version_id;
-    int struct_version_id;
-    bool (*field_exists)(void *opaque, int version_id);
-};
-
-struct VMStateDescription {
-    const char *name;
-    int version_id;
-    int (*pre_load)(void *opaque);
-    int (*post_load)(void *opaque, int version_id);
-    int (*pre_save)(void *opaque);
-    VMStateField *fields;
-};
-
-
-extern const VMStateInfo slirp_vmstate_info_int16;
-extern const VMStateInfo slirp_vmstate_info_int32;
-extern const VMStateInfo slirp_vmstate_info_uint8;
-extern const VMStateInfo slirp_vmstate_info_uint16;
-extern const VMStateInfo slirp_vmstate_info_uint32;
-
-/** Put this in the stream when migrating a null pointer.*/
-#define VMS_NULLPTR_MARKER (0x30U) /* '0' */
-extern const VMStateInfo slirp_vmstate_info_nullptr;
-
-extern const VMStateInfo slirp_vmstate_info_buffer;
-extern const VMStateInfo slirp_vmstate_info_tmp;
-
-#define type_check_array(t1,t2,n) ((t1(*)[n])0 - (t2*)0)
-#define type_check_pointer(t1,t2) ((t1**)0 - (t2*)0)
-#define typeof_field(type, field) typeof(((type *)0)->field)
-#define type_check(t1,t2) ((t1*)0 - (t2*)0)
-
-#define vmstate_offset_value(_state, _field, _type)                  \
-    (offsetof(_state, _field) +                                      \
-     type_check(_type, typeof_field(_state, _field)))
-
-#define vmstate_offset_pointer(_state, _field, _type)                \
-    (offsetof(_state, _field) +                                      \
-     type_check_pointer(_type, typeof_field(_state, _field)))
-
-#define vmstate_offset_array(_state, _field, _type, _num)            \
-    (offsetof(_state, _field) +                                      \
-     type_check_array(_type, typeof_field(_state, _field), _num))
-
-#define vmstate_offset_buffer(_state, _field)                        \
-    vmstate_offset_array(_state, _field, uint8_t,                    \
-                         sizeof(typeof_field(_state, _field)))
-
-/* In the macros below, if there is a _version, that means the macro's
- * field will be processed only if the version being received is >=
- * the _version specified.  In general, if you add a new field, you
- * would increment the structure's version and put that version
- * number into the new field so it would only be processed with the
- * new version.
- *
- * In particular, for VMSTATE_STRUCT() and friends the _version does
- * *NOT* pick the version of the sub-structure.  It works just as
- * specified above.  The version of the top-level structure received
- * is passed down to all sub-structures.  This means that the
- * sub-structures must have version that are compatible with all the
- * structures that use them.
- *
- * If you want to specify the version of the sub-structure, use
- * VMSTATE_VSTRUCT(), which allows the specific sub-structure version
- * to be directly specified.
- */
-
-#define VMSTATE_SINGLE_TEST(_field, _state, _test, _version, _info, _type) { \
-    .name         = (stringify(_field)),                             \
-    .version_id   = (_version),                                      \
-    .field_exists = (_test),                                         \
-    .size         = sizeof(_type),                                   \
-    .info         = &(_info),                                        \
-    .flags        = VMS_SINGLE,                                      \
-    .offset       = vmstate_offset_value(_state, _field, _type),     \
-}
-
-#define VMSTATE_ARRAY(_field, _state, _num, _version, _info, _type) {\
-    .name       = (stringify(_field)),                               \
-    .version_id = (_version),                                        \
-    .num        = (_num),                                            \
-    .info       = &(_info),                                          \
-    .size       = sizeof(_type),                                     \
-    .flags      = VMS_ARRAY,                                         \
-    .offset     = vmstate_offset_array(_state, _field, _type, _num), \
-}
-
-#define VMSTATE_STRUCT_TEST(_field, _state, _test, _version, _vmsd, _type) { \
-    .name         = (stringify(_field)),                             \
-    .version_id   = (_version),                                      \
-    .field_exists = (_test),                                         \
-    .vmsd         = &(_vmsd),                                        \
-    .size         = sizeof(_type),                                   \
-    .flags        = VMS_STRUCT,                                      \
-    .offset       = vmstate_offset_value(_state, _field, _type),     \
-}
-
-#define VMSTATE_STRUCT_POINTER_V(_field, _state, _version, _vmsd, _type) { \
-    .name         = (stringify(_field)),                             \
-    .version_id   = (_version),                                        \
-    .vmsd         = &(_vmsd),                                        \
-    .size         = sizeof(_type *),                                 \
-    .flags        = VMS_STRUCT|VMS_POINTER,                          \
-    .offset       = vmstate_offset_pointer(_state, _field, _type),   \
-}
-
-#define VMSTATE_STRUCT_ARRAY_TEST(_field, _state, _num, _test, _version, _vmsd, _type) { \
-    .name         = (stringify(_field)),                             \
-    .num          = (_num),                                          \
-    .field_exists = (_test),                                         \
-    .version_id   = (_version),                                      \
-    .vmsd         = &(_vmsd),                                        \
-    .size         = sizeof(_type),                                   \
-    .flags        = VMS_STRUCT|VMS_ARRAY,                            \
-    .offset       = vmstate_offset_array(_state, _field, _type, _num),\
-}
-
-#define VMSTATE_STATIC_BUFFER(_field, _state, _version, _test, _start, _size) { \
-    .name         = (stringify(_field)),                             \
-    .version_id   = (_version),                                      \
-    .field_exists = (_test),                                         \
-    .size         = (_size - _start),                                \
-    .info         = &slirp_vmstate_info_buffer,                      \
-    .flags        = VMS_BUFFER,                                      \
-    .offset       = vmstate_offset_buffer(_state, _field) + _start,  \
-}
-
-#define VMSTATE_VBUFFER_UINT32(_field, _state, _version, _test, _field_size) { \
-    .name         = (stringify(_field)),                             \
-    .version_id   = (_version),                                      \
-    .field_exists = (_test),                                         \
-    .size_offset  = vmstate_offset_value(_state, _field_size, uint32_t),\
-    .info         = &slirp_vmstate_info_buffer,                      \
-    .flags        = VMS_VBUFFER|VMS_POINTER,                         \
-    .offset       = offsetof(_state, _field),                        \
-}
-
-#define QEMU_BUILD_BUG_ON_STRUCT(x)             \
-    struct {                                    \
-        int:(x) ? -1 : 1;                       \
-    }
-
-#define QEMU_BUILD_BUG_ON_ZERO(x) (sizeof(QEMU_BUILD_BUG_ON_STRUCT(x)) - \
-                                   sizeof(QEMU_BUILD_BUG_ON_STRUCT(x)))
-
-/* Allocate a temporary of type 'tmp_type', set tmp->parent to _state
- * and execute the vmsd on the temporary.  Note that we're working with
- * the whole of _state here, not a field within it.
- * We compile time check that:
- *    That _tmp_type contains a 'parent' member that's a pointer to the
- *        '_state' type
- *    That the pointer is right at the start of _tmp_type.
- */
-#define VMSTATE_WITH_TMP(_state, _tmp_type, _vmsd) {                 \
-    .name         = "tmp",                                           \
-    .size         = sizeof(_tmp_type) +                              \
-                    QEMU_BUILD_BUG_ON_ZERO(offsetof(_tmp_type, parent) != 0) + \
-                    type_check_pointer(_state,                       \
-                        typeof_field(_tmp_type, parent)),            \
-    .vmsd         = &(_vmsd),                                        \
-    .info         = &slirp_vmstate_info_tmp,                         \
-}
-
-#define VMSTATE_SINGLE(_field, _state, _version, _info, _type)          \
-    VMSTATE_SINGLE_TEST(_field, _state, NULL, _version, _info, _type)
-
-#define VMSTATE_STRUCT(_field, _state, _version, _vmsd, _type)        \
-    VMSTATE_STRUCT_TEST(_field, _state, NULL, _version, _vmsd, _type)
-
-#define VMSTATE_STRUCT_POINTER(_field, _state, _vmsd, _type)          \
-    VMSTATE_STRUCT_POINTER_V(_field, _state, 0, _vmsd, _type)
-
-#define VMSTATE_STRUCT_ARRAY(_field, _state, _num, _version, _vmsd, _type) \
-    VMSTATE_STRUCT_ARRAY_TEST(_field, _state, _num, NULL, _version,   \
-            _vmsd, _type)
-
-#define VMSTATE_INT16_V(_f, _s, _v)                                   \
-    VMSTATE_SINGLE(_f, _s, _v, slirp_vmstate_info_int16, int16_t)
-#define VMSTATE_INT32_V(_f, _s, _v)                                   \
-    VMSTATE_SINGLE(_f, _s, _v, slirp_vmstate_info_int32, int32_t)
-
-#define VMSTATE_UINT8_V(_f, _s, _v)                                   \
-    VMSTATE_SINGLE(_f, _s, _v, slirp_vmstate_info_uint8, uint8_t)
-#define VMSTATE_UINT16_V(_f, _s, _v)                                  \
-    VMSTATE_SINGLE(_f, _s, _v, slirp_vmstate_info_uint16, uint16_t)
-#define VMSTATE_UINT32_V(_f, _s, _v)                                  \
-    VMSTATE_SINGLE(_f, _s, _v, slirp_vmstate_info_uint32, uint32_t)
-
-#define VMSTATE_INT16(_f, _s)                                         \
-    VMSTATE_INT16_V(_f, _s, 0)
-#define VMSTATE_INT32(_f, _s)                                         \
-    VMSTATE_INT32_V(_f, _s, 0)
-
-#define VMSTATE_UINT8(_f, _s)                                         \
-    VMSTATE_UINT8_V(_f, _s, 0)
-#define VMSTATE_UINT16(_f, _s)                                        \
-    VMSTATE_UINT16_V(_f, _s, 0)
-#define VMSTATE_UINT32(_f, _s)                                        \
-    VMSTATE_UINT32_V(_f, _s, 0)
-
-#define VMSTATE_UINT16_TEST(_f, _s, _t)                               \
-    VMSTATE_SINGLE_TEST(_f, _s, _t, 0, slirp_vmstate_info_uint16, uint16_t)
-
-#define VMSTATE_UINT32_TEST(_f, _s, _t)                                  \
-    VMSTATE_SINGLE_TEST(_f, _s, _t, 0, slirp_vmstate_info_uint32, uint32_t)
-
-#define VMSTATE_INT16_ARRAY_V(_f, _s, _n, _v)                         \
-    VMSTATE_ARRAY(_f, _s, _n, _v, slirp_vmstate_info_int16, int16_t)
-
-#define VMSTATE_INT16_ARRAY(_f, _s, _n)                               \
-    VMSTATE_INT16_ARRAY_V(_f, _s, _n, 0)
-
-#define VMSTATE_BUFFER_V(_f, _s, _v)                                    \
-    VMSTATE_STATIC_BUFFER(_f, _s, _v, NULL, 0, sizeof(typeof_field(_s, _f)))
-
-#define VMSTATE_BUFFER(_f, _s)                                        \
-    VMSTATE_BUFFER_V(_f, _s, 0)
-
-#define VMSTATE_END_OF_LIST()                                         \
-    {}
-
-#endif