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-rw-r--r--slirp/bootp.c212
-rw-r--r--slirp/bootp.h113
-rw-r--r--slirp/cksum.c141
-rw-r--r--slirp/ctl.h7
-rw-r--r--slirp/debug.c376
-rw-r--r--slirp/debug.h50
-rw-r--r--slirp/icmp_var.h69
-rw-r--r--slirp/if.c320
-rw-r--r--slirp/if.h50
-rw-r--r--slirp/ip.h317
-rw-r--r--slirp/ip_icmp.c376
-rw-r--r--slirp/ip_icmp.h164
-rw-r--r--slirp/ip_input.c697
-rw-r--r--slirp/ip_output.c205
-rw-r--r--slirp/libslirp.h19
-rw-r--r--slirp/main.h54
-rw-r--r--slirp/mbuf.c245
-rw-r--r--slirp/mbuf.h147
-rw-r--r--slirp/misc.c925
-rw-r--r--slirp/misc.h87
-rw-r--r--slirp/sbuf.c201
-rw-r--r--slirp/sbuf.h31
-rw-r--r--slirp/slirp.c550
-rw-r--r--slirp/slirp.h308
-rw-r--r--slirp/slirp_config.h186
-rw-r--r--slirp/socket.c696
-rw-r--r--slirp/socket.h104
-rw-r--r--slirp/tcp.h169
-rw-r--r--slirp/tcp_input.c1745
-rw-r--r--slirp/tcp_output.c608
-rw-r--r--slirp/tcp_subr.c1325
-rw-r--r--slirp/tcp_timer.c329
-rw-r--r--slirp/tcp_timer.h142
-rw-r--r--slirp/tcp_var.h252
-rw-r--r--slirp/tcpip.h74
-rw-r--r--slirp/udp.c654
-rw-r--r--slirp/udp.h109
37 files changed, 12057 insertions, 0 deletions
diff --git a/slirp/bootp.c b/slirp/bootp.c
new file mode 100644
index 0000000..7e4b5ba
--- /dev/null
+++ b/slirp/bootp.c
@@ -0,0 +1,212 @@
+/*
+ * 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>
+
+/* XXX: only DHCP is supported */
+
+#define NB_ADDR 16
+
+#define START_ADDR 15
+
+#define LEASE_TIME (24 * 3600)
+
+typedef struct {
+ uint8_t allocated;
+} BOOTPClient;
+
+BOOTPClient bootp_clients[NB_ADDR];
+
+static const uint8_t rfc1533_cookie[] = { RFC1533_COOKIE };
+
+#ifdef DEBUG
+#define dprintf(fmt, args...) \
+if (slirp_debug & DBG_CALL) { fprintf(dfd, fmt, ## args); fflush(dfd); }
+#else
+#define dprintf(fmt, args...)
+#endif
+
+static BOOTPClient *get_new_addr(struct in_addr *paddr)
+{
+ BOOTPClient *bc;
+ int i;
+
+ for(i = 0; i < NB_ADDR; i++) {
+ if (!bootp_clients[i].allocated)
+ goto found;
+ }
+ return NULL;
+ found:
+ bc = &bootp_clients[i];
+ bc->allocated = 1;
+ paddr->s_addr = htonl(ntohl(special_addr.s_addr) | (i + START_ADDR));
+ return bc;
+}
+
+static void dhcp_decode(const uint8_t *buf, int size,
+ int *pmsg_type)
+{
+ const uint8_t *p, *p_end;
+ int len, tag;
+
+ *pmsg_type = 0;
+
+ p = buf;
+ p_end = buf + size;
+ if (size < 5)
+ return;
+ 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++;
+ dprintf("dhcp: tag=0x%02x len=%d\n", tag, len);
+
+ switch(tag) {
+ case RFC2132_MSG_TYPE:
+ if (len >= 1)
+ *pmsg_type = p[0];
+ break;
+ default:
+ break;
+ }
+ p += len;
+ }
+ }
+}
+
+static void bootp_reply(struct bootp_t *bp)
+{
+ BOOTPClient *bc;
+ struct mbuf *m;
+ struct bootp_t *rbp;
+ struct sockaddr_in saddr, daddr;
+ struct in_addr dns_addr;
+ int dhcp_msg_type, val;
+ uint8_t *q;
+
+ /* extract exact DHCP msg type */
+ dhcp_decode(bp->bp_vend, DHCP_OPT_LEN, &dhcp_msg_type);
+ dprintf("bootp packet op=%d msgtype=%d\n", bp->bp_op, dhcp_msg_type);
+
+ if (dhcp_msg_type != DHCPDISCOVER &&
+ dhcp_msg_type != DHCPREQUEST)
+ return;
+ /* XXX: this is a hack to get the client mac address */
+ memcpy(client_ethaddr, bp->bp_hwaddr, 6);
+
+ if ((m = m_get()) == NULL)
+ 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));
+
+ bc = get_new_addr(&daddr.sin_addr);
+ if (!bc) {
+ dprintf("no address left\n");
+ return;
+ }
+ dprintf("offered addr=%08x\n", ntohl(daddr.sin_addr.s_addr));
+
+ saddr.sin_addr.s_addr = htonl(ntohl(special_addr.s_addr) | CTL_ALIAS);
+ 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, 6);
+
+ rbp->bp_yiaddr = daddr.sin_addr; /* IP address */
+
+ q = rbp->bp_vend;
+ memcpy(q, rfc1533_cookie, 4);
+ q += 4;
+
+ if (dhcp_msg_type == DHCPDISCOVER) {
+ *q++ = RFC2132_MSG_TYPE;
+ *q++ = 1;
+ *q++ = DHCPOFFER;
+ } else if (dhcp_msg_type == DHCPREQUEST) {
+ *q++ = RFC2132_MSG_TYPE;
+ *q++ = 1;
+ *q++ = DHCPACK;
+ }
+
+ if (dhcp_msg_type == DHCPDISCOVER ||
+ dhcp_msg_type == DHCPREQUEST) {
+ *q++ = RFC2132_SRV_ID;
+ *q++ = 4;
+ memcpy(q, &saddr.sin_addr, 4);
+ q += 4;
+
+ *q++ = RFC1533_NETMASK;
+ *q++ = 4;
+ *q++ = 0xff;
+ *q++ = 0xff;
+ *q++ = 0xff;
+ *q++ = 0x00;
+
+ *q++ = RFC1533_GATEWAY;
+ *q++ = 4;
+ memcpy(q, &saddr.sin_addr, 4);
+ q += 4;
+
+ *q++ = RFC1533_DNS;
+ *q++ = 4;
+ dns_addr.s_addr = htonl(ntohl(special_addr.s_addr) | CTL_DNS);
+ memcpy(q, &dns_addr, 4);
+ q += 4;
+
+ *q++ = RFC2132_LEASE_TIME;
+ *q++ = 4;
+ val = htonl(LEASE_TIME);
+ memcpy(q, &val, 4);
+ q += 4;
+ }
+ *q++ = RFC1533_END;
+
+ m->m_len = sizeof(struct bootp_t);
+ udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
+}
+
+void bootp_input(struct mbuf *m)
+{
+ struct bootp_t *bp = (struct bootp_t *)m->m_data;
+
+ if (bp->bp_op == BOOTP_REQUEST) {
+ bootp_reply(bp);
+ }
+}
diff --git a/slirp/bootp.h b/slirp/bootp.h
new file mode 100644
index 0000000..d3b2baa
--- /dev/null
+++ b/slirp/bootp.h
@@ -0,0 +1,113 @@
+/* bootp/dhcp defines */
+
+#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_MAX_SIZE 57
+#define RFC2132_RENEWAL_TIME 58
+#define RFC2132_REBIND_TIME 59
+
+#define DHCPDISCOVER 1
+#define DHCPOFFER 2
+#define DHCPREQUEST 3
+#define DHCPACK 5
+
+#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;
+ unsigned long bp_xid;
+ unsigned short bp_secs;
+ unsigned short 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];
+};
+
+void bootp_input(struct mbuf *m);
diff --git a/slirp/cksum.c b/slirp/cksum.c
new file mode 100644
index 0000000..f8f7512
--- /dev/null
+++ b/slirp/cksum.c
@@ -0,0 +1,141 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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]; ADDCARRY(sum);}
+
+int cksum(struct mbuf *m, int len)
+{
+ register u_int16_t *w;
+ register int sum = 0;
+ register int mlen = 0;
+ int byte_swapped = 0;
+
+ union {
+ u_int8_t c[2];
+ u_int16_t s;
+ } s_util;
+ union {
+ u_int16_t s[2];
+ u_int32_t l;
+ } l_util;
+
+ if (m->m_len == 0)
+ goto cont;
+ w = mtod(m, u_int16_t *);
+
+ mlen = m->m_len;
+
+ if (len < mlen)
+ mlen = len;
+ len -= mlen;
+ /*
+ * Force to even boundary.
+ */
+ if ((1 & (long) w) && (mlen > 0)) {
+ REDUCE;
+ sum <<= 8;
+ s_util.c[0] = *(u_int8_t *)w;
+ w = (u_int16_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;
+ byte_swapped = 0;
+ if (mlen == -1) {
+ s_util.c[1] = *(u_int8_t *)w;
+ sum += s_util.s;
+ mlen = 0;
+ } else
+
+ mlen = -1;
+ } else if (mlen == -1)
+ s_util.c[0] = *(u_int8_t *)w;
+
+cont:
+#ifdef DEBUG
+ if (len) {
+ DEBUG_ERROR((dfd, "cksum: out of data\n"));
+ DEBUG_ERROR((dfd, " len = %d\n", len));
+ }
+#endif
+ 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);
+}
diff --git a/slirp/ctl.h b/slirp/ctl.h
new file mode 100644
index 0000000..4a8576d
--- /dev/null
+++ b/slirp/ctl.h
@@ -0,0 +1,7 @@
+#define CTL_CMD 0
+#define CTL_EXEC 1
+#define CTL_ALIAS 2
+#define CTL_DNS 3
+
+#define CTL_SPECIAL "10.0.2.0"
+#define CTL_LOCAL "10.0.2.15"
diff --git a/slirp/debug.c b/slirp/debug.c
new file mode 100644
index 0000000..d3d8c57
--- /dev/null
+++ b/slirp/debug.c
@@ -0,0 +1,376 @@
+/*
+ * Copyright (c) 1995 Danny Gasparovski.
+ * Portions copyright (c) 2000 Kelly Price.
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+#include <slirp.h>
+
+FILE *dfd = NULL;
+#ifdef DEBUG
+int dostats = 1;
+#else
+int dostats = 0;
+#endif
+int slirp_debug = 0;
+
+extern char *strerror _P((int));
+
+/* Carry over one item from main.c so that the tty's restored.
+ * Only done when the tty being used is /dev/tty --RedWolf */
+extern struct termios slirp_tty_settings;
+extern int slirp_tty_restore;
+
+
+void
+debug_init(file, dbg)
+ char *file;
+ int dbg;
+{
+ /* Close the old debugging file */
+ if (dfd)
+ fclose(dfd);
+
+ dfd = fopen(file,"w");
+ if (dfd != NULL) {
+#if 0
+ fprintf(dfd,"Slirp %s - Debugging Started.\n", SLIRP_VERSION);
+#endif
+ fprintf(dfd,"Debugging Started level %i.\r\n",dbg);
+ fflush(dfd);
+ slirp_debug = dbg;
+ } else {
+ lprint("Error: Debugging file \"%s\" could not be opened: %s\r\n",
+ file, strerror(errno));
+ }
+}
+
+/*
+ * Dump a packet in the same format as tcpdump -x
+ */
+#ifdef DEBUG
+void
+dump_packet(dat, n)
+ void *dat;
+ int n;
+{
+ u_char *pptr = (u_char *)dat;
+ int j,k;
+
+ n /= 16;
+ n++;
+ DEBUG_MISC((dfd, "PACKET DUMPED: \n"));
+ for(j = 0; j < n; j++) {
+ for(k = 0; k < 6; k++)
+ DEBUG_MISC((dfd, "%02x ", *pptr++));
+ DEBUG_MISC((dfd, "\n"));
+ fflush(dfd);
+ }
+}
+#endif
+
+#if 0
+/*
+ * Statistic routines
+ *
+ * These will print statistics to the screen, the debug file (dfd), or
+ * a buffer, depending on "type", so that the stats can be sent over
+ * the link as well.
+ */
+
+void
+ttystats(ttyp)
+ struct ttys *ttyp;
+{
+ struct slirp_ifstats *is = &ttyp->ifstats;
+ char buff[512];
+
+ lprint(" \r\n");
+
+ if (if_comp & IF_COMPRESS)
+ strcpy(buff, "on");
+ else if (if_comp & IF_NOCOMPRESS)
+ strcpy(buff, "off");
+ else
+ strcpy(buff, "off (for now)");
+ lprint("Unit %d:\r\n", ttyp->unit);
+ lprint(" using %s encapsulation (VJ compression is %s)\r\n", (
+#ifdef USE_PPP
+ ttyp->proto==PROTO_PPP?"PPP":
+#endif
+ "SLIP"), buff);
+ lprint(" %d baudrate\r\n", ttyp->baud);
+ lprint(" interface is %s\r\n", ttyp->up?"up":"down");
+ lprint(" using fd %d, guardian pid is %d\r\n", ttyp->fd, ttyp->pid);
+#ifndef FULL_BOLT
+ lprint(" towrite is %d bytes\r\n", ttyp->towrite);
+#endif
+ if (ttyp->zeros)
+ lprint(" %d zeros have been typed\r\n", ttyp->zeros);
+ else if (ttyp->ones)
+ lprint(" %d ones have been typed\r\n", ttyp->ones);
+ lprint("Interface stats:\r\n");
+ lprint(" %6d output packets sent (%d bytes)\r\n", is->out_pkts, is->out_bytes);
+ lprint(" %6d output packets dropped (%d bytes)\r\n", is->out_errpkts, is->out_errbytes);
+ lprint(" %6d input packets received (%d bytes)\r\n", is->in_pkts, is->in_bytes);
+ lprint(" %6d input packets dropped (%d bytes)\r\n", is->in_errpkts, is->in_errbytes);
+ lprint(" %6d bad input packets\r\n", is->in_mbad);
+}
+
+void
+allttystats()
+{
+ struct ttys *ttyp;
+
+ for (ttyp = ttys; ttyp; ttyp = ttyp->next)
+ ttystats(ttyp);
+}
+#endif
+
+void
+ipstats()
+{
+ lprint(" \r\n");
+
+ lprint("IP stats:\r\n");
+ lprint(" %6d total packets received (%d were unaligned)\r\n",
+ ipstat.ips_total, ipstat.ips_unaligned);
+ lprint(" %6d with incorrect version\r\n", ipstat.ips_badvers);
+ lprint(" %6d with bad header checksum\r\n", ipstat.ips_badsum);
+ lprint(" %6d with length too short (len < sizeof(iphdr))\r\n", ipstat.ips_tooshort);
+ lprint(" %6d with length too small (len < ip->len)\r\n", ipstat.ips_toosmall);
+ lprint(" %6d with bad header length\r\n", ipstat.ips_badhlen);
+ lprint(" %6d with bad packet length\r\n", ipstat.ips_badlen);
+ lprint(" %6d fragments received\r\n", ipstat.ips_fragments);
+ lprint(" %6d fragments dropped\r\n", ipstat.ips_fragdropped);
+ lprint(" %6d fragments timed out\r\n", ipstat.ips_fragtimeout);
+ lprint(" %6d packets reassembled ok\r\n", ipstat.ips_reassembled);
+ lprint(" %6d outgoing packets fragmented\r\n", ipstat.ips_fragmented);
+ lprint(" %6d total outgoing fragments\r\n", ipstat.ips_ofragments);
+ lprint(" %6d with bad protocol field\r\n", ipstat.ips_noproto);
+ lprint(" %6d total packets delivered\r\n", ipstat.ips_delivered);
+}
+
+#if 0
+void
+vjstats()
+{
+ lprint(" \r\n");
+
+ lprint("VJ compression stats:\r\n");
+
+ lprint(" %6d outbound packets (%d compressed)\r\n",
+ comp_s.sls_packets, comp_s.sls_compressed);
+ lprint(" %6d searches for connection stats (%d misses)\r\n",
+ comp_s.sls_searches, comp_s.sls_misses);
+ lprint(" %6d inbound uncompressed packets\r\n", comp_s.sls_uncompressedin);
+ lprint(" %6d inbound compressed packets\r\n", comp_s.sls_compressedin);
+ lprint(" %6d inbound unknown type packets\r\n", comp_s.sls_errorin);
+ lprint(" %6d inbound packets tossed due to error\r\n", comp_s.sls_tossed);
+}
+#endif
+
+void
+tcpstats()
+{
+ lprint(" \r\n");
+
+ lprint("TCP stats:\r\n");
+
+ lprint(" %6d packets sent\r\n", tcpstat.tcps_sndtotal);
+ lprint(" %6d data packets (%d bytes)\r\n",
+ tcpstat.tcps_sndpack, tcpstat.tcps_sndbyte);
+ lprint(" %6d data packets retransmitted (%d bytes)\r\n",
+ tcpstat.tcps_sndrexmitpack, tcpstat.tcps_sndrexmitbyte);
+ lprint(" %6d ack-only packets (%d delayed)\r\n",
+ tcpstat.tcps_sndacks, tcpstat.tcps_delack);
+ lprint(" %6d URG only packets\r\n", tcpstat.tcps_sndurg);
+ lprint(" %6d window probe packets\r\n", tcpstat.tcps_sndprobe);
+ lprint(" %6d window update packets\r\n", tcpstat.tcps_sndwinup);
+ lprint(" %6d control (SYN/FIN/RST) packets\r\n", tcpstat.tcps_sndctrl);
+ lprint(" %6d times tcp_output did nothing\r\n", tcpstat.tcps_didnuttin);
+
+ lprint(" %6d packets received\r\n", tcpstat.tcps_rcvtotal);
+ lprint(" %6d acks (for %d bytes)\r\n",
+ tcpstat.tcps_rcvackpack, tcpstat.tcps_rcvackbyte);
+ lprint(" %6d duplicate acks\r\n", tcpstat.tcps_rcvdupack);
+ lprint(" %6d acks for unsent data\r\n", tcpstat.tcps_rcvacktoomuch);
+ lprint(" %6d packets received in sequence (%d bytes)\r\n",
+ tcpstat.tcps_rcvpack, tcpstat.tcps_rcvbyte);
+ lprint(" %6d completely duplicate packets (%d bytes)\r\n",
+ tcpstat.tcps_rcvduppack, tcpstat.tcps_rcvdupbyte);
+
+ lprint(" %6d packets with some duplicate data (%d bytes duped)\r\n",
+ tcpstat.tcps_rcvpartduppack, tcpstat.tcps_rcvpartdupbyte);
+ lprint(" %6d out-of-order packets (%d bytes)\r\n",
+ tcpstat.tcps_rcvoopack, tcpstat.tcps_rcvoobyte);
+ lprint(" %6d packets of data after window (%d bytes)\r\n",
+ tcpstat.tcps_rcvpackafterwin, tcpstat.tcps_rcvbyteafterwin);
+ lprint(" %6d window probes\r\n", tcpstat.tcps_rcvwinprobe);
+ lprint(" %6d window update packets\r\n", tcpstat.tcps_rcvwinupd);
+ lprint(" %6d packets received after close\r\n", tcpstat.tcps_rcvafterclose);
+ lprint(" %6d discarded for bad checksums\r\n", tcpstat.tcps_rcvbadsum);
+ lprint(" %6d discarded for bad header offset fields\r\n",
+ tcpstat.tcps_rcvbadoff);
+
+ lprint(" %6d connection requests\r\n", tcpstat.tcps_connattempt);
+ lprint(" %6d connection accepts\r\n", tcpstat.tcps_accepts);
+ lprint(" %6d connections established (including accepts)\r\n", tcpstat.tcps_connects);
+ lprint(" %6d connections closed (including %d drop)\r\n",
+ tcpstat.tcps_closed, tcpstat.tcps_drops);
+ lprint(" %6d embryonic connections dropped\r\n", tcpstat.tcps_conndrops);
+ lprint(" %6d segments we tried to get rtt (%d succeeded)\r\n",
+ tcpstat.tcps_segstimed, tcpstat.tcps_rttupdated);
+ lprint(" %6d retransmit timeouts\r\n", tcpstat.tcps_rexmttimeo);
+ lprint(" %6d connections dropped by rxmt timeout\r\n",
+ tcpstat.tcps_timeoutdrop);
+ lprint(" %6d persist timeouts\r\n", tcpstat.tcps_persisttimeo);
+ lprint(" %6d keepalive timeouts\r\n", tcpstat.tcps_keeptimeo);
+ lprint(" %6d keepalive probes sent\r\n", tcpstat.tcps_keepprobe);
+ lprint(" %6d connections dropped by keepalive\r\n", tcpstat.tcps_keepdrops);
+ lprint(" %6d correct ACK header predictions\r\n", tcpstat.tcps_predack);
+ lprint(" %6d correct data packet header predictions\n", tcpstat.tcps_preddat);
+ lprint(" %6d TCP cache misses\r\n", tcpstat.tcps_socachemiss);
+
+
+/* lprint(" Packets received too short: %d\r\n", tcpstat.tcps_rcvshort); */
+/* lprint(" Segments dropped due to PAWS: %d\r\n", tcpstat.tcps_pawsdrop); */
+
+}
+
+void
+udpstats()
+{
+ lprint(" \r\n");
+
+ lprint("UDP stats:\r\n");
+ lprint(" %6d datagrams received\r\n", udpstat.udps_ipackets);
+ lprint(" %6d with packets shorter than header\r\n", udpstat.udps_hdrops);
+ lprint(" %6d with bad checksums\r\n", udpstat.udps_badsum);
+ lprint(" %6d with data length larger than packet\r\n", udpstat.udps_badlen);
+ lprint(" %6d UDP socket cache misses\r\n", udpstat.udpps_pcbcachemiss);
+ lprint(" %6d datagrams sent\r\n", udpstat.udps_opackets);
+}
+
+void
+icmpstats()
+{
+ lprint(" \r\n");
+ lprint("ICMP stats:\r\n");
+ lprint(" %6d ICMP packets received\r\n", icmpstat.icps_received);
+ lprint(" %6d were too short\r\n", icmpstat.icps_tooshort);
+ lprint(" %6d with bad checksums\r\n", icmpstat.icps_checksum);
+ lprint(" %6d with type not supported\r\n", icmpstat.icps_notsupp);
+ lprint(" %6d with bad type feilds\r\n", icmpstat.icps_badtype);
+ lprint(" %6d ICMP packets sent in reply\r\n", icmpstat.icps_reflect);
+}
+
+void
+mbufstats()
+{
+ struct mbuf *m;
+ int i;
+
+ lprint(" \r\n");
+
+ lprint("Mbuf stats:\r\n");
+
+ lprint(" %6d mbufs allocated (%d max)\r\n", mbuf_alloced, mbuf_max);
+
+ i = 0;
+ for (m = m_freelist.m_next; m != &m_freelist; m = m->m_next)
+ i++;
+ lprint(" %6d mbufs on free list\r\n", i);
+
+ i = 0;
+ for (m = m_usedlist.m_next; m != &m_usedlist; m = m->m_next)
+ i++;
+ lprint(" %6d mbufs on used list\r\n", i);
+ lprint(" %6d mbufs queued as packets\r\n\r\n", if_queued);
+}
+
+void
+sockstats()
+{
+ char buff[256];
+ int n;
+ struct socket *so;
+
+ lprint(" \r\n");
+
+ lprint(
+ "Proto[state] Sock Local Address, Port Remote Address, Port RecvQ SendQ\r\n");
+
+ for (so = tcb.so_next; so != &tcb; so = so->so_next) {
+
+ n = sprintf(buff, "tcp[%s]", so->so_tcpcb?tcpstates[so->so_tcpcb->t_state]:"NONE");
+ while (n < 17)
+ buff[n++] = ' ';
+ buff[17] = 0;
+ lprint("%s %3d %15s %5d ",
+ buff, so->s,
+ inet_ntoa(so->so_laddr), ntohs(so->so_lport));
+ lprint("%15s %5d %5d %5d\r\n",
+ inet_ntoa(so->so_faddr), ntohs(so->so_fport),
+ so->so_rcv.sb_cc, so->so_snd.sb_cc);
+ }
+
+ for (so = udb.so_next; so != &udb; so = so->so_next) {
+
+ n = sprintf(buff, "udp[%d sec]", (so->so_expire - curtime) / 1000);
+ while (n < 17)
+ buff[n++] = ' ';
+ buff[17] = 0;
+ lprint("%s %3d %15s %5d ",
+ buff, so->s,
+ inet_ntoa(so->so_laddr), ntohs(so->so_lport));
+ lprint("%15s %5d %5d %5d\r\n",
+ inet_ntoa(so->so_faddr), ntohs(so->so_fport),
+ so->so_rcv.sb_cc, so->so_snd.sb_cc);
+ }
+}
+
+#if 0
+void
+slirp_exit(exit_status)
+ int exit_status;
+{
+ struct ttys *ttyp;
+
+ DEBUG_CALL("slirp_exit");
+ DEBUG_ARG("exit_status = %d", exit_status);
+
+ if (dostats) {
+ lprint_print = (int (*) _P((void *, const char *, va_list)))vfprintf;
+ if (!dfd)
+ debug_init("slirp_stats", 0xf);
+ lprint_arg = (char **)&dfd;
+
+ ipstats();
+ tcpstats();
+ udpstats();
+ icmpstats();
+ mbufstats();
+ sockstats();
+ allttystats();
+ vjstats();
+ }
+
+ for (ttyp = ttys; ttyp; ttyp = ttyp->next)
+ tty_detached(ttyp, 1);
+
+ if (slirp_forked) {
+ /* Menendez time */
+ if (kill(getppid(), SIGQUIT) < 0)
+ lprint("Couldn't kill parent process %ld!\n",
+ (long) getppid());
+ }
+
+ /* Restore the terminal if we gotta */
+ if(slirp_tty_restore)
+ tcsetattr(0,TCSANOW, &slirp_tty_settings); /* NOW DAMMIT! */
+ exit(exit_status);
+}
+#endif
diff --git a/slirp/debug.h b/slirp/debug.h
new file mode 100644
index 0000000..6e8444d
--- /dev/null
+++ b/slirp/debug.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 1995 Danny Gasparovski.
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+#define PRN_STDERR 1
+#define PRN_SPRINTF 2
+
+extern FILE *dfd;
+extern FILE *lfd;
+extern int dostats;
+extern int slirp_debug;
+
+#define DBG_CALL 0x1
+#define DBG_MISC 0x2
+#define DBG_ERROR 0x4
+#define DEBUG_DEFAULT DBG_CALL|DBG_MISC|DBG_ERROR
+
+#ifdef DEBUG
+#define DEBUG_CALL(x) if (slirp_debug & DBG_CALL) { fprintf(dfd, "%s...\n", x); fflush(dfd); }
+#define DEBUG_ARG(x, y) if (slirp_debug & DBG_CALL) { fputc(' ', dfd); fprintf(dfd, x, y); fputc('\n', dfd); fflush(dfd); }
+#define DEBUG_ARGS(x) if (slirp_debug & DBG_CALL) { fprintf x ; fflush(dfd); }
+#define DEBUG_MISC(x) if (slirp_debug & DBG_MISC) { fprintf x ; fflush(dfd); }
+#define DEBUG_ERROR(x) if (slirp_debug & DBG_ERROR) {fprintf x ; fflush(dfd); }
+
+
+#else
+
+#define DEBUG_CALL(x)
+#define DEBUG_ARG(x, y)
+#define DEBUG_ARGS(x)
+#define DEBUG_MISC(x)
+#define DEBUG_ERROR(x)
+
+#endif
+
+void debug_init _P((char *, int));
+//void ttystats _P((struct ttys *));
+void allttystats _P((void));
+void ipstats _P((void));
+void vjstats _P((void));
+void tcpstats _P((void));
+void udpstats _P((void));
+void icmpstats _P((void));
+void mbufstats _P((void));
+void sockstats _P((void));
+void slirp_exit _P((int));
+
diff --git a/slirp/icmp_var.h b/slirp/icmp_var.h
new file mode 100644
index 0000000..03fc8c3
--- /dev/null
+++ b/slirp/icmp_var.h
@@ -0,0 +1,69 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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.
+ *
+ * @(#)icmp_var.h 8.1 (Berkeley) 6/10/93
+ * icmp_var.h,v 1.4 1995/02/16 00:27:40 wollman Exp
+ */
+
+#ifndef _NETINET_ICMP_VAR_H_
+#define _NETINET_ICMP_VAR_H_
+
+/*
+ * Variables related to this implementation
+ * of the internet control message protocol.
+ */
+struct icmpstat {
+/* statistics related to input messages processed */
+ u_long icps_received; /* #ICMP packets received */
+ u_long icps_tooshort; /* packet < ICMP_MINLEN */
+ u_long icps_checksum; /* bad checksum */
+ u_long icps_notsupp; /* #ICMP packets not supported */
+ u_long icps_badtype; /* #with bad type feild */
+ u_long icps_reflect; /* number of responses */
+};
+
+/*
+ * Names for ICMP sysctl objects
+ */
+#define ICMPCTL_MASKREPL 1 /* allow replies to netmask requests */
+#define ICMPCTL_STATS 2 /* statistics (read-only) */
+#define ICMPCTL_MAXID 3
+
+#define ICMPCTL_NAMES { \
+ { 0, 0 }, \
+ { "maskrepl", CTLTYPE_INT }, \
+ { "stats", CTLTYPE_STRUCT }, \
+}
+
+extern struct icmpstat icmpstat;
+
+#endif
diff --git a/slirp/if.c b/slirp/if.c
new file mode 100644
index 0000000..282b674
--- /dev/null
+++ b/slirp/if.c
@@ -0,0 +1,320 @@
+/*
+ * Copyright (c) 1995 Danny Gasparovski.
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+#include <slirp.h>
+
+int if_mtu, if_mru;
+int if_comp;
+int if_maxlinkhdr;
+int if_queued = 0; /* Number of packets queued so far */
+int if_thresh = 10; /* Number of packets queued before we start sending
+ * (to prevent allocing too many mbufs) */
+
+struct mbuf if_fastq; /* fast queue (for interactive data) */
+struct mbuf if_batchq; /* queue for non-interactive data */
+struct mbuf *next_m; /* Pointer to next mbuf to output */
+
+#define ifs_init(ifm) ((ifm)->ifs_next = (ifm)->ifs_prev = (ifm))
+
+void
+ifs_insque(ifm, ifmhead)
+ struct mbuf *ifm, *ifmhead;
+{
+ ifm->ifs_next = ifmhead->ifs_next;
+ ifmhead->ifs_next = ifm;
+ ifm->ifs_prev = ifmhead;
+ ifm->ifs_next->ifs_prev = ifm;
+}
+
+void
+ifs_remque(ifm)
+ struct mbuf *ifm;
+{
+ ifm->ifs_prev->ifs_next = ifm->ifs_next;
+ ifm->ifs_next->ifs_prev = ifm->ifs_prev;
+}
+
+void
+if_init()
+{
+#if 0
+ /*
+ * Set if_maxlinkhdr to 48 because it's 40 bytes for TCP/IP,
+ * and 8 bytes for PPP, but need to have it on an 8byte boundary
+ */
+#ifdef USE_PPP
+ if_maxlinkhdr = 48;
+#else
+ if_maxlinkhdr = 40;
+#endif
+#else
+ /* 14 for ethernet + 40 */
+ if_maxlinkhdr = 14 + 40;
+#endif
+ if_mtu = 1500;
+ if_mru = 1500;
+ if_comp = IF_AUTOCOMP;
+ if_fastq.ifq_next = if_fastq.ifq_prev = &if_fastq;
+ if_batchq.ifq_next = if_batchq.ifq_prev = &if_batchq;
+ // sl_compress_init(&comp_s);
+ next_m = &if_batchq;
+}
+
+#if 0
+/*
+ * This shouldn't be needed since the modem is blocking and
+ * we don't expect any signals, but what the hell..
+ */
+inline int
+writen(fd, bptr, n)
+ int fd;
+ char *bptr;
+ int n;
+{
+ int ret;
+ int total;
+
+ /* This should succeed most of the time */
+ ret = write(fd, bptr, n);
+ if (ret == n || ret <= 0)
+ return ret;
+
+ /* Didn't write everything, go into the loop */
+ total = ret;
+ while (n > total) {
+ ret = write(fd, bptr+total, n-total);
+ if (ret <= 0)
+ return ret;
+ total += ret;
+ }
+ return total;
+}
+
+/*
+ * if_input - read() the tty, do "top level" processing (ie: check for any escapes),
+ * and pass onto (*ttyp->if_input)
+ *
+ * XXXXX Any zeros arriving by themselves are NOT placed into the arriving packet.
+ */
+#define INBUFF_SIZE 2048 /* XXX */
+void
+if_input(ttyp)
+ struct ttys *ttyp;
+{
+ u_char if_inbuff[INBUFF_SIZE];
+ int if_n;
+
+ DEBUG_CALL("if_input");
+ DEBUG_ARG("ttyp = %lx", (long)ttyp);
+
+ if_n = read(ttyp->fd, (char *)if_inbuff, INBUFF_SIZE);
+
+ DEBUG_MISC((dfd, " read %d bytes\n", if_n));
+
+ if (if_n <= 0) {
+ if (if_n == 0 || (errno != EINTR && errno != EAGAIN)) {
+ if (ttyp->up)
+ link_up--;
+ tty_detached(ttyp, 0);
+ }
+ return;
+ }
+ if (if_n == 1) {
+ if (*if_inbuff == '0') {
+ ttyp->ones = 0;
+ if (++ttyp->zeros >= 5)
+ slirp_exit(0);
+ return;
+ }
+ if (*if_inbuff == '1') {
+ ttyp->zeros = 0;
+ if (++ttyp->ones >= 5)
+ tty_detached(ttyp, 0);
+ return;
+ }
+ }
+ ttyp->ones = ttyp->zeros = 0;
+
+ (*ttyp->if_input)(ttyp, if_inbuff, if_n);
+}
+#endif
+
+/*
+ * 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(so, ifm)
+ struct socket *so;
+ struct mbuf *ifm;
+{
+ struct mbuf *ifq;
+ int on_fastq = 1;
+
+ DEBUG_CALL("if_output");
+ DEBUG_ARG("so = %lx", (long)so);
+ DEBUG_ARG("ifm = %lx", (long)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?
+ */
+ for (ifq = if_batchq.ifq_prev; ifq != &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 = if_fastq.ifq_prev;
+ 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 = if_batchq.ifq_prev;
+
+ /* Create a new doubly linked list for this session */
+ ifm->ifq_so = so;
+ ifs_init(ifm);
+ insque(ifm, ifq);
+
+diddit:
+ ++if_queued;
+
+ 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, &if_batchq);
+ }
+ }
+
+#ifndef FULL_BOLT
+ /*
+ * This prevents us from malloc()ing too many mbufs
+ */
+ if (link_up) {
+ /* if_start will check towrite */
+ if_start();
+ }
+#endif
+}
+
+/*
+ * Send a packet
+ * We choose a packet based on it's position in the output queues;
+ * If there are packets on the fastq, they are sent FIFO, before
+ * everything else. Otherwise we choose the first packet from the
+ * batchq and send it. the next packet chosen will be from the session
+ * after this one, then the session after that one, and so on.. So,
+ * for example, if there are 3 ftp session's 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, then back
+ * to the first, etc. etc.
+ */
+void
+if_start(void)
+{
+ struct mbuf *ifm, *ifqt;
+
+ DEBUG_CALL("if_start");
+
+ if (if_queued == 0)
+ return; /* Nothing to do */
+
+ again:
+ /* check if we can really output */
+ if (!slirp_can_output())
+ return;
+
+ /*
+ * See which queue to get next packet from
+ * If there's something in the fastq, select it immediately
+ */
+ if (if_fastq.ifq_next != &if_fastq) {
+ ifm = if_fastq.ifq_next;
+ } else {
+ /* Nothing on fastq, see if next_m is valid */
+ if (next_m != &if_batchq)
+ ifm = next_m;
+ else
+ ifm = if_batchq.ifq_next;
+
+ /* Set which packet to send on next iteration */
+ next_m = ifm->ifq_next;
+ }
+ /* Remove it from the queue */
+ ifqt = ifm->ifq_prev;
+ remque(ifm);
+ --if_queued;
+
+ /* If there are more packets for this session, re-queue them */
+ if (ifm->ifs_next != /* ifm->ifs_prev != */ ifm) {
+ insque(ifm->ifs_next, ifqt);
+ ifs_remque(ifm);
+ }
+
+ /* Update so_queued */
+ if (ifm->ifq_so) {
+ if (--ifm->ifq_so->so_queued == 0)
+ /* If there's no more queued, reset nqueued */
+ ifm->ifq_so->so_nqueued = 0;
+ }
+
+ /* Encapsulate the packet for sending */
+ if_encap(ifm->m_data, ifm->m_len);
+
+ if (if_queued)
+ goto again;
+}
diff --git a/slirp/if.h b/slirp/if.h
new file mode 100644
index 0000000..5d96a90
--- /dev/null
+++ b/slirp/if.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 1995 Danny Gasparovski.
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+#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 */
+
+/* Needed for FreeBSD */
+#undef if_mtu
+extern int if_mtu;
+extern int if_mru; /* MTU and MRU */
+extern int if_comp; /* Flags for compression */
+extern int if_maxlinkhdr;
+extern int if_queued; /* Number of packets queued so far */
+extern int if_thresh; /* Number of packets queued before we start sending
+ * (to prevent allocing too many mbufs) */
+
+extern struct mbuf if_fastq; /* fast queue (for interactive data) */
+extern struct mbuf if_batchq; /* queue for non-interactive data */
+extern struct mbuf *next_m;
+
+#define ifs_init(ifm) ((ifm)->ifs_next = (ifm)->ifs_prev = (ifm))
+
+/* Interface statistics */
+struct slirp_ifstats {
+ u_int out_pkts; /* Output packets */
+ u_int out_bytes; /* Output bytes */
+ u_int out_errpkts; /* Output Error Packets */
+ u_int out_errbytes; /* Output Error Bytes */
+ u_int in_pkts; /* Input packets */
+ u_int in_bytes; /* Input bytes */
+ u_int in_errpkts; /* Input Error Packets */
+ u_int in_errbytes; /* Input Error Bytes */
+
+ u_int bytes_saved; /* Number of bytes that compression "saved" */
+ /* ie: number of bytes that didn't need to be sent over the link
+ * because of compression */
+
+ u_int in_mbad; /* Bad incoming packets */
+};
+
+#endif
diff --git a/slirp/ip.h b/slirp/ip.h
new file mode 100644
index 0000000..8280e55
--- /dev/null
+++ b/slirp/ip.h
@@ -0,0 +1,317 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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_
+
+#ifdef WORDS_BIGENDIAN
+# ifndef NTOHL
+# define NTOHL(d)
+# endif
+# ifndef NTOHS
+# define NTOHS(d)
+# endif
+# ifndef HTONL
+# define HTONL(d)
+# endif
+# ifndef HTONS
+# define HTONS(d)
+# endif
+#else
+# ifndef NTOHL
+# define NTOHL(d) ((d) = ntohl((d)))
+# endif
+# ifndef NTOHS
+# define NTOHS(d) ((d) = ntohs((u_int16_t)(d)))
+# endif
+# ifndef HTONL
+# define HTONL(d) ((d) = htonl((d)))
+# endif
+# ifndef HTONS
+# define HTONS(d) ((d) = htons((u_int16_t)(d)))
+# endif
+#endif
+
+typedef u_int32_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.
+ *
+ * We declare ip_len and ip_off to be short, rather than u_short
+ * pragmatically since otherwise unsigned comparisons can result
+ * against negative integers quite easily, and fail in subtle ways.
+ */
+struct ip {
+#ifdef WORDS_BIGENDIAN
+ u_int ip_v:4, /* version */
+ ip_hl:4; /* header length */
+#else
+ u_int ip_hl:4, /* header length */
+ ip_v:4; /* version */
+#endif
+ u_int8_t ip_tos; /* type of service */
+ int16_t ip_len; /* total length */
+ u_int16_t ip_id; /* identification */
+ int16_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 */
+ u_int8_t ip_ttl; /* time to live */
+ u_int8_t ip_p; /* protocol */
+ u_int16_t ip_sum; /* checksum */
+ struct in_addr ip_src,ip_dst; /* source and dest address */
+};
+
+#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 {
+ u_int8_t ipt_code; /* IPOPT_TS */
+ u_int8_t ipt_len; /* size of structure (variable) */
+ u_int8_t ipt_ptr; /* index of current entry */
+#ifdef WORDS_BIGENDIAN
+ u_int ipt_oflw:4, /* overflow counter */
+ ipt_flg:4; /* flags, see below */
+#else
+ u_int 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;
+};
+
+/* 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 */
+
+#ifdef HAVE_SYS_TYPES32_H /* Overcome some Solaris 2.x junk */
+#include <sys/types32.h>
+#else
+#if SIZEOF_CHAR_P == 4
+typedef caddr_t caddr32_t;
+#else
+typedef u_int32_t caddr32_t;
+#endif
+#endif
+
+#if SIZEOF_CHAR_P == 4
+typedef struct ipq *ipqp_32;
+typedef struct ipasfrag *ipasfragp_32;
+#else
+typedef caddr32_t ipqp_32;
+typedef caddr32_t ipasfragp_32;
+#endif
+
+/*
+ * Overlay for ip header used by other protocols (tcp, udp).
+ */
+struct ipovly {
+ caddr32_t ih_next, ih_prev; /* for protocol sequence q's */
+ u_int8_t ih_x1; /* (unused) */
+ u_int8_t ih_pr; /* protocol */
+ int16_t ih_len; /* protocol length */
+ struct in_addr ih_src; /* source internet address */
+ struct in_addr ih_dst; /* destination internet address */
+};
+
+/*
+ * 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 {
+ ipqp_32 next,prev; /* to other reass headers */
+ u_int8_t ipq_ttl; /* time for reass q to live */
+ u_int8_t ipq_p; /* protocol of this fragment */
+ u_int16_t ipq_id; /* sequence id for reassembly */
+ ipasfragp_32 ipq_next,ipq_prev;
+ /* to ip headers of fragments */
+ struct in_addr ipq_src,ipq_dst;
+};
+
+/*
+ * Ip header, when holding a fragment.
+ *
+ * Note: ipf_next must be at same offset as ipq_next above
+ */
+struct ipasfrag {
+#ifdef WORDS_BIGENDIAN
+ u_int ip_v:4,
+ ip_hl:4;
+#else
+ u_int ip_hl:4,
+ ip_v:4;
+#endif
+ /* BUG : u_int changed to u_int8_t.
+ * sizeof(u_int)==4 on linux 2.0
+ */
+ u_int8_t ipf_mff; /* XXX overlays ip_tos: use low bit
+ * to avoid destroying tos (PPPDTRuu);
+ * copied from (ip_off&IP_MF) */
+ int16_t ip_len;
+ u_int16_t ip_id;
+ int16_t ip_off;
+ u_int8_t ip_ttl;
+ u_int8_t ip_p;
+ u_int16_t ip_sum;
+ ipasfragp_32 ipf_next; /* next fragment */
+ ipasfragp_32 ipf_prev; /* previous fragment */
+};
+
+/*
+ * Structure stored in mbuf in inpcb.ip_options
+ * and passed to ip_output when ip options are in use.
+ * The actual length of the options (including ipopt_dst)
+ * is in m_len.
+ */
+#define MAX_IPOPTLEN 40
+
+struct ipoption {
+ struct in_addr ipopt_dst; /* first-hop dst if source routed */
+ int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */
+};
+
+/*
+ * Structure attached to inpcb.ip_moptions and
+ * passed to ip_output when IP multicast options are in use.
+ */
+
+struct ipstat {
+ u_long ips_total; /* total packets received */
+ u_long ips_badsum; /* checksum bad */
+ u_long ips_tooshort; /* packet too short */
+ u_long ips_toosmall; /* not enough data */
+ u_long ips_badhlen; /* ip header length < data size */
+ u_long ips_badlen; /* ip length < ip header length */
+ u_long ips_fragments; /* fragments received */
+ u_long ips_fragdropped; /* frags dropped (dups, out of space) */
+ u_long ips_fragtimeout; /* fragments timed out */
+ u_long ips_forward; /* packets forwarded */
+ u_long ips_cantforward; /* packets rcvd for unreachable dest */
+ u_long ips_redirectsent; /* packets forwarded on same net */
+ u_long ips_noproto; /* unknown or unsupported protocol */
+ u_long ips_delivered; /* datagrams delivered to upper level*/
+ u_long ips_localout; /* total ip packets generated here */
+ u_long ips_odropped; /* lost packets due to nobufs, etc. */
+ u_long ips_reassembled; /* total packets reassembled ok */
+ u_long ips_fragmented; /* datagrams successfully fragmented */
+ u_long ips_ofragments; /* output fragments created */
+ u_long ips_cantfrag; /* don't fragment flag was set, etc. */
+ u_long ips_badoptions; /* error in option processing */
+ u_long ips_noroute; /* packets discarded due to no route */
+ u_long ips_badvers; /* ip version != 4 */
+ u_long ips_rawout; /* total raw ip packets generated */
+ u_long ips_unaligned; /* times the ip packet was not aligned */
+};
+
+extern struct ipstat ipstat;
+extern struct ipq ipq; /* ip reass. queue */
+extern u_int16_t ip_id; /* ip packet ctr, for ids */
+extern int ip_defttl; /* default IP ttl */
+
+#endif
diff --git a/slirp/ip_icmp.c b/slirp/ip_icmp.c
new file mode 100644
index 0000000..8bc97a0
--- /dev/null
+++ b/slirp/ip_icmp.c
@@ -0,0 +1,376 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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"
+
+struct icmpstat icmpstat;
+
+/* The message sent when emulating PING */
+/* Be nice and tell them it's just a psuedo-ping packet */
+char icmp_ping_msg[] = "This is a psuedo-PING packet used by Slirp to emulate ICMP ECHO-REQUEST packets.\n";
+
+/* list of actions for icmp_error() on RX of an icmp message */
+static 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
+};
+
+/*
+ * Process a received ICMP message.
+ */
+void
+icmp_input(m, hlen)
+ struct mbuf *m;
+ int hlen;
+{
+ register struct icmp *icp;
+ register struct ip *ip=mtod(m, struct ip *);
+ int icmplen=ip->ip_len;
+ /* int code; */
+
+ DEBUG_CALL("icmp_input");
+ DEBUG_ARG("m = %lx", (long )m);
+ DEBUG_ARG("m_len = %d", m->m_len);
+
+ icmpstat.icps_received++;
+
+ /*
+ * 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 */
+ icmpstat.icps_tooshort++;
+ freeit:
+ m_freem(m);
+ goto end_error;
+ }
+
+ m->m_len -= hlen;
+ m->m_data += hlen;
+ icp = mtod(m, struct icmp *);
+ if (cksum(m, icmplen)) {
+ icmpstat.icps_checksum++;
+ goto freeit;
+ }
+ m->m_len += hlen;
+ m->m_data -= hlen;
+
+ /* icmpstat.icps_inhist[icp->icmp_type]++; */
+ /* code = icp->icmp_code; */
+
+ DEBUG_ARG("icmp_type = %d", icp->icmp_type);
+ switch (icp->icmp_type) {
+ case ICMP_ECHO:
+ icp->icmp_type = ICMP_ECHOREPLY;
+ ip->ip_len += hlen; /* since ip_input subtracts this */
+ if (ip->ip_dst.s_addr == our_addr.s_addr ||
+ (ip->ip_dst.s_addr == (special_addr.s_addr|htonl(CTL_ALIAS))) ) {
+ icmp_reflect(m);
+ } else {
+ struct socket *so;
+ struct sockaddr_in addr;
+ if ((so = socreate()) == NULL) goto freeit;
+ if(udp_attach(so) == -1) {
+ DEBUG_MISC((dfd,"icmp_input udp_attach errno = %d-%s\n",
+ errno,strerror(errno)));
+ sofree(so);
+ m_free(m);
+ goto end_error;
+ }
+ so->so_m = m;
+ so->so_faddr = ip->ip_dst;
+ so->so_fport = htons(7);
+ 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.sin_family = AF_INET;
+ if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
+ /* It's an alias */
+ switch(ntohl(so->so_faddr.s_addr) & 0xff) {
+ case CTL_DNS:
+ addr.sin_addr = dns_addr;
+ break;
+ case CTL_ALIAS:
+ default:
+ addr.sin_addr = loopback_addr;
+ break;
+ }
+ } else {
+ addr.sin_addr = so->so_faddr;
+ }
+ addr.sin_port = so->so_fport;
+ if(sendto(so->s, icmp_ping_msg, strlen(icmp_ping_msg), 0,
+ (struct sockaddr *)&addr, sizeof(addr)) == -1) {
+ DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
+ errno,strerror(errno)));
+ icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
+ udp_detach(so);
+ }
+ } /* if ip->ip_dst.s_addr == our_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:
+ icmpstat.icps_notsupp++;
+ m_freem(m);
+ break;
+
+ default:
+ icmpstat.icps_badtype++;
+ m_freem(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_error(msrc, type, code, minsize, message)
+ struct mbuf *msrc;
+ u_char type;
+ u_char code;
+ int minsize;
+ char *message;
+{
+ unsigned hlen, shlen, s_ip_len;
+ register struct ip *ip;
+ register struct icmp *icp;
+ register struct mbuf *m;
+
+ DEBUG_CALL("icmp_error");
+ DEBUG_ARG("msrc = %lx", (long )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 DEBUG
+ { char bufa[20], bufb[20];
+ strcpy(bufa, inet_ntoa(ip->ip_src));
+ strcpy(bufb, inet_ntoa(ip->ip_dst));
+ DEBUG_MISC((dfd, " %.16s to %.16s\n", bufa, bufb));
+ }
+#endif
+ if(ip->ip_off & IP_OFFMASK) goto end_error; /* Only reply to fragment 0 */
+
+ 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 */
+ if(!(m=m_get())) goto end_error; /* get mbuf */
+ { 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 DEBUG
+ if(message) { /* DEBUG : 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;
+ }
+#endif
+
+ 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 adresses */
+ ip->ip_src = our_addr;
+
+ (void ) ip_output((struct socket *)NULL, m);
+
+ icmpstat.icps_reflect++;
+
+end_error:
+ return;
+}
+#undef ICMP_MAXDATALEN
+
+/*
+ * Reflect the ip packet back to the source
+ */
+void
+icmp_reflect(m)
+ 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_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((caddr_t)(ip + 1), (caddr_t)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);
+
+ icmpstat.icps_reflect++;
+}
diff --git a/slirp/ip_icmp.h b/slirp/ip_icmp.h
new file mode 100644
index 0000000..7ddaaf8
--- /dev/null
+++ b/slirp/ip_icmp.h
@@ -0,0 +1,164 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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 u_int32_t n_time;
+
+/*
+ * Structure of an icmp header.
+ */
+struct icmp {
+ u_char icmp_type; /* type of message, see below */
+ u_char icmp_code; /* type sub code */
+ u_short icmp_cksum; /* ones complement cksum of struct */
+ union {
+ u_char ih_pptr; /* ICMP_PARAMPROB */
+ struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
+ struct ih_idseq {
+ u_short icd_id;
+ u_short icd_seq;
+ } ih_idseq;
+ int ih_void;
+
+ /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
+ struct ih_pmtu {
+ u_short ipm_void;
+ u_short 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;
+ u_long 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 insure that the
+ * packet is large enought 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_input _P((struct mbuf *, int));
+void icmp_error _P((struct mbuf *, u_char, u_char, int, char *));
+void icmp_reflect _P((struct mbuf *));
+
+#endif
diff --git a/slirp/ip_input.c b/slirp/ip_input.c
new file mode 100644
index 0000000..74b9223
--- /dev/null
+++ b/slirp/ip_input.c
@@ -0,0 +1,697 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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.
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+#include <slirp.h>
+#include "ip_icmp.h"
+
+int ip_defttl;
+struct ipstat ipstat;
+struct ipq ipq;
+
+/*
+ * IP initialization: fill in IP protocol switch table.
+ * All protocols not implemented in kernel go to raw IP protocol handler.
+ */
+void
+ip_init()
+{
+ ipq.next = ipq.prev = (ipqp_32)&ipq;
+ ip_id = tt.tv_sec & 0xffff;
+ udp_init();
+ tcp_init();
+ ip_defttl = IPDEFTTL;
+}
+
+/*
+ * Ip input routine. Checksum and byte swap header. If fragmented
+ * try to reassemble. Process options. Pass to next level.
+ */
+void
+ip_input(m)
+ struct mbuf *m;
+{
+ register struct ip *ip;
+ int hlen;
+
+ DEBUG_CALL("ip_input");
+ DEBUG_ARG("m = %lx", (long)m);
+ DEBUG_ARG("m_len = %d", m->m_len);
+
+ ipstat.ips_total++;
+
+ if (m->m_len < sizeof (struct ip)) {
+ ipstat.ips_toosmall++;
+ return;
+ }
+
+ ip = mtod(m, struct ip *);
+
+ if (ip->ip_v != IPVERSION) {
+ ipstat.ips_badvers++;
+ goto bad;
+ }
+
+ hlen = ip->ip_hl << 2;
+ if (hlen<sizeof(struct ip ) || hlen>m->m_len) {/* min header length */
+ ipstat.ips_badhlen++; /* or packet too short */
+ goto bad;
+ }
+
+ /* keep ip header intact for ICMP reply
+ * ip->ip_sum = cksum(m, hlen);
+ * if (ip->ip_sum) {
+ */
+ if(cksum(m,hlen)) {
+ ipstat.ips_badsum++;
+ goto bad;
+ }
+
+ /*
+ * Convert fields to host representation.
+ */
+ NTOHS(ip->ip_len);
+ if (ip->ip_len < hlen) {
+ ipstat.ips_badlen++;
+ 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) {
+ ipstat.ips_tooshort++;
+ 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 || ip->ip_ttl==1) {
+ icmp_error(m, ICMP_TIMXCEED,ICMP_TIMXCEED_INTRANS, 0,"ttl");
+ goto bad;
+ }
+
+ /*
+ * Process options and, if not destined for us,
+ * ship it on. ip_dooptions returns 1 when an
+ * error was detected (causing an icmp message
+ * to be sent and the original packet to be freed).
+ */
+/* We do no IP options */
+/* if (hlen > sizeof (struct ip) && ip_dooptions(m))
+ * goto next;
+ */
+ /*
+ * 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;
+ /*
+ * Look for queue of fragments
+ * of this datagram.
+ */
+ for (fp = (struct ipq *) ipq.next; fp != &ipq;
+ fp = (struct ipq *) fp->next)
+ 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 = 0;
+ 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)
+ ((struct ipasfrag *)ip)->ipf_mff |= 1;
+ else
+ ((struct ipasfrag *)ip)->ipf_mff &= ~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 (((struct ipasfrag *)ip)->ipf_mff & 1 || ip->ip_off) {
+ ipstat.ips_fragments++;
+ ip = ip_reass((struct ipasfrag *)ip, fp);
+ if (ip == 0)
+ return;
+ ipstat.ips_reassembled++;
+ m = dtom(ip);
+ } else
+ if (fp)
+ ip_freef(fp);
+
+ } else
+ ip->ip_len -= hlen;
+
+ /*
+ * Switch out to protocol's input routine.
+ */
+ ipstat.ips_delivered++;
+ switch (ip->ip_p) {
+ case IPPROTO_TCP:
+ tcp_input(m, hlen, (struct socket *)NULL);
+ break;
+ case IPPROTO_UDP:
+ udp_input(m, hlen);
+ break;
+ case IPPROTO_ICMP:
+ icmp_input(m, hlen);
+ break;
+ default:
+ ipstat.ips_noproto++;
+ m_free(m);
+ }
+ return;
+bad:
+ m_freem(m);
+ return;
+}
+
+/*
+ * 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.
+ */
+struct ip *
+ip_reass(ip, fp)
+ register struct ipasfrag *ip;
+ register struct ipq *fp;
+{
+ register struct mbuf *m = dtom(ip);
+ register struct ipasfrag *q;
+ int hlen = ip->ip_hl << 2;
+ int i, next;
+
+ DEBUG_CALL("ip_reass");
+ DEBUG_ARG("ip = %lx", (long)ip);
+ DEBUG_ARG("fp = %lx", (long)fp);
+ DEBUG_ARG("m = %lx", (long)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 == 0) {
+ struct mbuf *t;
+ if ((t = m_get()) == NULL) goto dropfrag;
+ fp = mtod(t, struct ipq *);
+ insque_32(fp, &ipq);
+ fp->ipq_ttl = IPFRAGTTL;
+ fp->ipq_p = ip->ip_p;
+ fp->ipq_id = ip->ip_id;
+ fp->ipq_next = fp->ipq_prev = (ipasfragp_32)fp;
+ fp->ipq_src = ((struct ip *)ip)->ip_src;
+ fp->ipq_dst = ((struct ip *)ip)->ip_dst;
+ q = (struct ipasfrag *)fp;
+ goto insert;
+ }
+
+ /*
+ * Find a segment which begins after this one does.
+ */
+ for (q = (struct ipasfrag *)fp->ipq_next; q != (struct ipasfrag *)fp;
+ q = (struct ipasfrag *)q->ipf_next)
+ if (q->ip_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 != (ipasfragp_32)fp) {
+ i = ((struct ipasfrag *)(q->ipf_prev))->ip_off +
+ ((struct ipasfrag *)(q->ipf_prev))->ip_len - ip->ip_off;
+ if (i > 0) {
+ if (i >= ip->ip_len)
+ goto dropfrag;
+ m_adj(dtom(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 && ip->ip_off + ip->ip_len > q->ip_off) {
+ i = (ip->ip_off + ip->ip_len) - q->ip_off;
+ if (i < q->ip_len) {
+ q->ip_len -= i;
+ q->ip_off += i;
+ m_adj(dtom(q), i);
+ break;
+ }
+ q = (struct ipasfrag *) q->ipf_next;
+ m_freem(dtom((struct ipasfrag *) q->ipf_prev));
+ ip_deq((struct ipasfrag *) q->ipf_prev);
+ }
+
+insert:
+ /*
+ * Stick new segment in its place;
+ * check for complete reassembly.
+ */
+ ip_enq(ip, (struct ipasfrag *) q->ipf_prev);
+ next = 0;
+ for (q = (struct ipasfrag *) fp->ipq_next; q != (struct ipasfrag *)fp;
+ q = (struct ipasfrag *) q->ipf_next) {
+ if (q->ip_off != next)
+ return (0);
+ next += q->ip_len;
+ }
+ if (((struct ipasfrag *)(q->ipf_prev))->ipf_mff & 1)
+ return (0);
+
+ /*
+ * Reassembly is complete; concatenate fragments.
+ */
+ q = (struct ipasfrag *) fp->ipq_next;
+ m = dtom(q);
+
+ q = (struct ipasfrag *) q->ipf_next;
+ while (q != (struct ipasfrag *)fp) {
+ struct mbuf *t;
+ t = dtom(q);
+ m_cat(m, t);
+ q = (struct ipasfrag *) q->ipf_next;
+ }
+
+ /*
+ * Create header for new ip packet by
+ * modifying header of first packet;
+ * dequeue and discard fragment reassembly header.
+ * Make header visible.
+ */
+ ip = (struct ipasfrag *) fp->ipq_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;
+ delta = (char *)ip - m->m_dat;
+ ip = (struct ipasfrag *)(m->m_ext + delta);
+ }
+
+ /* DEBUG_ARG("ip = %lx", (long)ip);
+ * ip=(struct ipasfrag *)m->m_data; */
+
+ ip->ip_len = next;
+ ip->ipf_mff &= ~1;
+ ((struct ip *)ip)->ip_src = fp->ipq_src;
+ ((struct ip *)ip)->ip_dst = fp->ipq_dst;
+ remque_32(fp);
+ (void) m_free(dtom(fp));
+ m = dtom(ip);
+ m->m_len += (ip->ip_hl << 2);
+ m->m_data -= (ip->ip_hl << 2);
+
+ return ((struct ip *)ip);
+
+dropfrag:
+ ipstat.ips_fragdropped++;
+ m_freem(m);
+ return (0);
+}
+
+/*
+ * Free a fragment reassembly header and all
+ * associated datagrams.
+ */
+void
+ip_freef(fp)
+ struct ipq *fp;
+{
+ register struct ipasfrag *q, *p;
+
+ for (q = (struct ipasfrag *) fp->ipq_next; q != (struct ipasfrag *)fp;
+ q = p) {
+ p = (struct ipasfrag *) q->ipf_next;
+ ip_deq(q);
+ m_freem(dtom(q));
+ }
+ remque_32(fp);
+ (void) m_free(dtom(fp));
+}
+
+/*
+ * Put an ip fragment on a reassembly chain.
+ * Like insque, but pointers in middle of structure.
+ */
+void
+ip_enq(p, prev)
+ register struct ipasfrag *p, *prev;
+{
+ DEBUG_CALL("ip_enq");
+ DEBUG_ARG("prev = %lx", (long)prev);
+ p->ipf_prev = (ipasfragp_32) prev;
+ p->ipf_next = prev->ipf_next;
+ ((struct ipasfrag *)(prev->ipf_next))->ipf_prev = (ipasfragp_32) p;
+ prev->ipf_next = (ipasfragp_32) p;
+}
+
+/*
+ * To ip_enq as remque is to insque.
+ */
+void
+ip_deq(p)
+ 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()
+{
+ register struct ipq *fp;
+
+ DEBUG_CALL("ip_slowtimo");
+
+ fp = (struct ipq *) ipq.next;
+ if (fp == 0)
+ return;
+
+ while (fp != &ipq) {
+ --fp->ipq_ttl;
+ fp = (struct ipq *) fp->next;
+ if (((struct ipq *)(fp->prev))->ipq_ttl == 0) {
+ ipstat.ips_fragtimeout++;
+ ip_freef((struct ipq *) fp->prev);
+ }
+ }
+}
+
+/*
+ * Do option processing on a datagram,
+ * possibly discarding it if bad options are encountered,
+ * or forwarding it if source-routed.
+ * Returns 1 if packet has been forwarded/freed,
+ * 0 if the packet should be processed further.
+ */
+
+#ifdef notdef
+
+int
+ip_dooptions(m)
+ struct mbuf *m;
+{
+ register struct ip *ip = mtod(m, struct ip *);
+ register u_char *cp;
+ register struct ip_timestamp *ipt;
+ register struct in_ifaddr *ia;
+/* int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; */
+ int opt, optlen, cnt, off, code, type, forward = 0;
+ struct in_addr *sin, dst;
+typedef u_int32_t n_time;
+ n_time ntime;
+
+ dst = ip->ip_dst;
+ cp = (u_char *)(ip + 1);
+ cnt = (ip->ip_hl << 2) - sizeof (struct ip);
+ for (; cnt > 0; cnt -= optlen, cp += optlen) {
+ opt = cp[IPOPT_OPTVAL];
+ if (opt == IPOPT_EOL)
+ break;
+ if (opt == IPOPT_NOP)
+ optlen = 1;
+ else {
+ optlen = cp[IPOPT_OLEN];
+ if (optlen <= 0 || optlen > cnt) {
+ code = &cp[IPOPT_OLEN] - (u_char *)ip;
+ goto bad;
+ }
+ }
+ switch (opt) {
+
+ default:
+ break;
+
+ /*
+ * Source routing with record.
+ * Find interface with current destination address.
+ * If none on this machine then drop if strictly routed,
+ * or do nothing if loosely routed.
+ * Record interface address and bring up next address
+ * component. If strictly routed make sure next
+ * address is on directly accessible net.
+ */
+ case IPOPT_LSRR:
+ case IPOPT_SSRR:
+ if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
+ code = &cp[IPOPT_OFFSET] - (u_char *)ip;
+ goto bad;
+ }
+ ipaddr.sin_addr = ip->ip_dst;
+ ia = (struct in_ifaddr *)
+ ifa_ifwithaddr((struct sockaddr *)&ipaddr);
+ if (ia == 0) {
+ if (opt == IPOPT_SSRR) {
+ type = ICMP_UNREACH;
+ code = ICMP_UNREACH_SRCFAIL;
+ goto bad;
+ }
+ /*
+ * Loose routing, and not at next destination
+ * yet; nothing to do except forward.
+ */
+ break;
+ }
+ off--; / * 0 origin * /
+ if (off > optlen - sizeof(struct in_addr)) {
+ /*
+ * End of source route. Should be for us.
+ */
+ save_rte(cp, ip->ip_src);
+ break;
+ }
+ /*
+ * locate outgoing interface
+ */
+ bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
+ sizeof(ipaddr.sin_addr));
+ if (opt == IPOPT_SSRR) {
+#define INA struct in_ifaddr *
+#define SA struct sockaddr *
+ if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == 0)
+ ia = (INA)ifa_ifwithnet((SA)&ipaddr);
+ } else
+ ia = ip_rtaddr(ipaddr.sin_addr);
+ if (ia == 0) {
+ type = ICMP_UNREACH;
+ code = ICMP_UNREACH_SRCFAIL;
+ goto bad;
+ }
+ ip->ip_dst = ipaddr.sin_addr;
+ bcopy((caddr_t)&(IA_SIN(ia)->sin_addr),
+ (caddr_t)(cp + off), sizeof(struct in_addr));
+ cp[IPOPT_OFFSET] += sizeof(struct in_addr);
+ /*
+ * Let ip_intr's mcast routing check handle mcast pkts
+ */
+ forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr));
+ break;
+
+ case IPOPT_RR:
+ if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
+ code = &cp[IPOPT_OFFSET] - (u_char *)ip;
+ goto bad;
+ }
+ /*
+ * If no space remains, ignore.
+ */
+ off--; * 0 origin *
+ if (off > optlen - sizeof(struct in_addr))
+ break;
+ bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
+ sizeof(ipaddr.sin_addr));
+ /*
+ * locate outgoing interface; if we're the destination,
+ * use the incoming interface (should be same).
+ */
+ if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 &&
+ (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
+ type = ICMP_UNREACH;
+ code = ICMP_UNREACH_HOST;
+ goto bad;
+ }
+ bcopy((caddr_t)&(IA_SIN(ia)->sin_addr),
+ (caddr_t)(cp + off), sizeof(struct in_addr));
+ cp[IPOPT_OFFSET] += sizeof(struct in_addr);
+ break;
+
+ case IPOPT_TS:
+ code = cp - (u_char *)ip;
+ ipt = (struct ip_timestamp *)cp;
+ if (ipt->ipt_len < 5)
+ goto bad;
+ if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
+ if (++ipt->ipt_oflw == 0)
+ goto bad;
+ break;
+ }
+ sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1);
+ switch (ipt->ipt_flg) {
+
+ case IPOPT_TS_TSONLY:
+ break;
+
+ case IPOPT_TS_TSANDADDR:
+ if (ipt->ipt_ptr + sizeof(n_time) +
+ sizeof(struct in_addr) > ipt->ipt_len)
+ goto bad;
+ ipaddr.sin_addr = dst;
+ ia = (INA)ifaof_ i f p foraddr((SA)&ipaddr,
+ m->m_pkthdr.rcvif);
+ if (ia == 0)
+ continue;
+ bcopy((caddr_t)&IA_SIN(ia)->sin_addr,
+ (caddr_t)sin, sizeof(struct in_addr));
+ ipt->ipt_ptr += sizeof(struct in_addr);
+ break;
+
+ case IPOPT_TS_PRESPEC:
+ if (ipt->ipt_ptr + sizeof(n_time) +
+ sizeof(struct in_addr) > ipt->ipt_len)
+ goto bad;
+ bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr,
+ sizeof(struct in_addr));
+ if (ifa_ifwithaddr((SA)&ipaddr) == 0)
+ continue;
+ ipt->ipt_ptr += sizeof(struct in_addr);
+ break;
+
+ default:
+ goto bad;
+ }
+ ntime = iptime();
+ bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
+ sizeof(n_time));
+ ipt->ipt_ptr += sizeof(n_time);
+ }
+ }
+ if (forward) {
+ ip_forward(m, 1);
+ return (1);
+ }
+ }
+ }
+ return (0);
+bad:
+ /* ip->ip_len -= ip->ip_hl << 2; XXX icmp_error adds in hdr length */
+
+/* Not yet */
+ icmp_error(m, type, code, 0, 0);
+
+ ipstat.ips_badoptions++;
+ return (1);
+}
+
+#endif /* notdef */
+
+/*
+ * 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(m, mopt)
+ register struct mbuf *m;
+ struct mbuf *mopt;
+{
+ register int i;
+ struct ip *ip = mtod(m, struct ip *);
+ register caddr_t opts;
+ int olen;
+
+ olen = (ip->ip_hl<<2) - sizeof (struct ip);
+ opts = (caddr_t)(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/ip_output.c b/slirp/ip_output.c
new file mode 100644
index 0000000..f3dc9b7
--- /dev/null
+++ b/slirp/ip_output.c
@@ -0,0 +1,205 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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.
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+#include <slirp.h>
+
+u_int16_t ip_id;
+
+/*
+ * 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(so, m0)
+ struct socket *so;
+ struct mbuf *m0;
+{
+ 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 = %lx", (long)so);
+ DEBUG_ARG("m0 = %lx", (long)m0);
+
+ /* We do no options */
+/* if (opt) {
+ * m = ip_insertoptions(m, opt, &len);
+ * hlen = len;
+ * }
+ */
+ ip = mtod(m, struct ip *);
+ /*
+ * Fill in IP header.
+ */
+ ip->ip_v = IPVERSION;
+ ip->ip_off &= IP_DF;
+ ip->ip_id = htons(ip_id++);
+ ip->ip_hl = hlen >> 2;
+ ipstat.ips_localout++;
+
+ /*
+ * Verify that we have any chance at all of being able to queue
+ * the packet or packet fragments
+ */
+ /* XXX Hmmm... */
+/* if (if_queued > if_thresh && towrite <= 0) {
+ * error = ENOBUFS;
+ * goto bad;
+ * }
+ */
+
+ /*
+ * If small enough for interface, can just send directly.
+ */
+ if ((u_int16_t)ip->ip_len <= if_mtu) {
+ ip->ip_len = htons((u_int16_t)ip->ip_len);
+ ip->ip_off = htons((u_int16_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;
+ ipstat.ips_cantfrag++;
+ 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 < (u_int16_t)ip->ip_len; off += len) {
+ register struct ip *mhip;
+ m = m_get();
+ if (m == 0) {
+ error = -1;
+ ipstat.ips_odropped++;
+ goto sendorfree;
+ }
+ m->m_data += if_maxlinkhdr;
+ mhip = mtod(m, struct ip *);
+ *mhip = *ip;
+
+ /* No options */
+/* if (hlen > sizeof (struct ip)) {
+ * mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
+ * mhip->ip_hl = mhlen >> 2;
+ * }
+ */
+ 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 >= (u_int16_t)ip->ip_len)
+ len = (u_int16_t)ip->ip_len - off;
+ else
+ mhip->ip_off |= IP_MF;
+ mhip->ip_len = htons((u_int16_t)(len + mhlen));
+
+ if (m_copy(m, m0, off, len) < 0) {
+ error = -1;
+ goto sendorfree;
+ }
+
+ mhip->ip_off = htons((u_int16_t)mhip->ip_off);
+ mhip->ip_sum = 0;
+ mhip->ip_sum = cksum(m, mhlen);
+ *mnext = m;
+ mnext = &m->m_nextpkt;
+ ipstat.ips_ofragments++;
+ }
+ /*
+ * 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 - (u_int16_t)ip->ip_len);
+ ip->ip_len = htons((u_int16_t)m->m_len);
+ ip->ip_off = htons((u_int16_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 = 0;
+ if (error == 0)
+ if_output(so, m);
+ else
+ m_freem(m);
+ }
+
+ if (error == 0)
+ ipstat.ips_fragmented++;
+ }
+
+done:
+ return (error);
+
+bad:
+ m_freem(m0);
+ goto done;
+}
diff --git a/slirp/libslirp.h b/slirp/libslirp.h
new file mode 100644
index 0000000..31ddaea
--- /dev/null
+++ b/slirp/libslirp.h
@@ -0,0 +1,19 @@
+#ifndef _LIBSLIRP_H
+#define _LIBSLIRP_H
+
+#include <sys/select.h>
+
+void slirp_init(void);
+
+void slirp_select_fill(int *pnfds,
+ fd_set *readfds, fd_set *writefds, fd_set *xfds);
+
+void slirp_select_poll(fd_set *readfds, fd_set *writefds, fd_set *xfds);
+
+void slirp_input(const uint8_t *pkt, int pkt_len);
+
+/* you must provide the following functions: */
+int slirp_can_output(void);
+void slirp_output(const uint8_t *pkt, int pkt_len);
+
+#endif
diff --git a/slirp/main.h b/slirp/main.h
new file mode 100644
index 0000000..dc06d6f
--- /dev/null
+++ b/slirp/main.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 1995 Danny Gasparovski.
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+
+#define TOWRITEMAX 512
+#define min(x,y) ((x) < (y) ? (x) : (y))
+
+extern struct timeval tt;
+extern int link_up;
+extern int slirp_socket;
+extern int slirp_socket_unit;
+extern int slirp_socket_port;
+extern u_int32_t slirp_socket_addr;
+extern char *slirp_socket_passwd;
+extern int ctty_closed;
+
+/*
+ * Get the difference in 2 times from updtim()
+ * Allow for wraparound times, "just in case"
+ * x is the greater of the 2 (current time) and y is
+ * what it's being compared against.
+ */
+#define TIME_DIFF(x,y) (x)-(y) < 0 ? ~0-(y)+(x) : (x)-(y)
+
+extern char *slirp_tty;
+extern char *exec_shell;
+extern u_int curtime;
+extern fd_set *global_readfds, *global_writefds, *global_xfds;
+extern struct in_addr ctl_addr;
+extern struct in_addr special_addr;
+extern struct in_addr our_addr;
+extern struct in_addr loopback_addr;
+extern struct in_addr dns_addr;
+extern char *username;
+extern char *socket_path;
+extern int towrite_max;
+extern int ppp_exit;
+extern int so_options;
+extern int tcp_keepintvl;
+extern uint8_t client_ethaddr[6];
+
+#define PROTO_SLIP 0x1
+#ifdef USE_PPP
+#define PROTO_PPP 0x2
+#endif
+
+void if_encap(const uint8_t *ip_data, int ip_data_len);
diff --git a/slirp/mbuf.c b/slirp/mbuf.c
new file mode 100644
index 0000000..fa36d89
--- /dev/null
+++ b/slirp/mbuf.c
@@ -0,0 +1,245 @@
+/*
+ * Copyright (c) 1995 Danny Gasparovski
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+/*
+ * 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 malloced buffer is pointed to
+ * by m_ext (and the data pointers) and M_EXT is set in
+ * the flags
+ */
+
+#include <slirp.h>
+
+struct mbuf *mbutl;
+char *mclrefcnt;
+int mbuf_alloced = 0;
+struct mbuf m_freelist, m_usedlist;
+int mbuf_thresh = 30;
+int mbuf_max = 0;
+int msize;
+
+void
+m_init()
+{
+ m_freelist.m_next = m_freelist.m_prev = &m_freelist;
+ m_usedlist.m_next = m_usedlist.m_prev = &m_usedlist;
+ msize_init();
+}
+
+void
+msize_init()
+{
+ /*
+ * Find a nice value for msize
+ * XXX if_maxlinkhdr already in mtu
+ */
+ msize = (if_mtu>if_mru?if_mtu:if_mru) +
+ if_maxlinkhdr + sizeof(struct m_hdr ) + 6;
+}
+
+/*
+ * Get an mbuf from the free list, if there are none
+ * malloc 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 free() it
+ */
+struct mbuf *
+m_get()
+{
+ register struct mbuf *m;
+ int flags = 0;
+
+ DEBUG_CALL("m_get");
+
+ if (m_freelist.m_next == &m_freelist) {
+ m = (struct mbuf *)malloc(msize);
+ if (m == NULL) goto end_error;
+ mbuf_alloced++;
+ if (mbuf_alloced > mbuf_thresh)
+ flags = M_DOFREE;
+ if (mbuf_alloced > mbuf_max)
+ mbuf_max = mbuf_alloced;
+ } else {
+ m = m_freelist.m_next;
+ remque(m);
+ }
+
+ /* Insert it in the used list */
+ insque(m,&m_usedlist);
+ m->m_flags = (flags | M_USEDLIST);
+
+ /* Initialise it */
+ m->m_size = msize - sizeof(struct m_hdr);
+ m->m_data = m->m_dat;
+ m->m_len = 0;
+ m->m_nextpkt = 0;
+ m->m_prevpkt = 0;
+end_error:
+ DEBUG_ARG("m = %lx", (long )m);
+ return m;
+}
+
+void
+m_free(m)
+ struct mbuf *m;
+{
+
+ DEBUG_CALL("m_free");
+ DEBUG_ARG("m = %lx", (long )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)
+ free(m->m_ext);
+
+ /*
+ * Either free() it or put it on the free list
+ */
+ if (m->m_flags & M_DOFREE) {
+ free(m);
+ mbuf_alloced--;
+ } else if ((m->m_flags & M_FREELIST) == 0) {
+ insque(m,&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, malloc()
+ * an M_EXT data segment
+ */
+void
+m_cat(m, n)
+ register struct mbuf *m, *n;
+{
+ /*
+ * If there's no room, realloc
+ */
+ if (M_FREEROOM(m) < n->m_len)
+ m_inc(m,m->m_size+MINCSIZE);
+
+ 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 */
+void
+m_inc(m, size)
+ struct mbuf *m;
+ int size;
+{
+ /* some compiles throw up on gotos. This one we can fake. */
+ if(m->m_size>size) return;
+
+ if (m->m_flags & M_EXT) {
+ /* datasize = m->m_data - m->m_ext; */
+ m->m_ext = (char *)realloc(m->m_ext,size);
+/* if (m->m_ext == NULL)
+ * return (struct mbuf *)NULL;
+ */
+ /* m->m_data = m->m_ext + datasize; */
+ } else {
+ int datasize;
+ char *dat;
+ datasize = m->m_data - m->m_dat;
+ dat = (char *)malloc(size);
+/* if (dat == NULL)
+ * return (struct mbuf *)NULL;
+ */
+ memcpy(dat, m->m_dat, m->m_size);
+
+ m->m_ext = dat;
+ m->m_data = m->m_ext + datasize;
+ m->m_flags |= M_EXT;
+ }
+
+ m->m_size = size;
+
+}
+
+
+
+void
+m_adj(m, len)
+ 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(n, m, off, len)
+ struct mbuf *n, *m;
+ int off, 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(dat)
+ void *dat;
+{
+ struct mbuf *m;
+
+ DEBUG_CALL("dtom");
+ DEBUG_ARG("dat = %lx", (long )dat);
+
+ /* bug corrected for M_EXT buffers */
+ for (m = m_usedlist.m_next; m != &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((dfd, "dtom failed"));
+
+ return (struct mbuf *)0;
+}
+
diff --git a/slirp/mbuf.h b/slirp/mbuf.h
new file mode 100644
index 0000000..8cc292b
--- /dev/null
+++ b/slirp/mbuf.h
@@ -0,0 +1,147 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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_
+
+#define m_freem m_free
+
+
+#define MINCSIZE 4096 /* Amount to increase mbuf if too small */
+
+/*
+ * Macros for type conversion
+ * mtod(m,t) - convert mbuf pointer to data pointer of correct type
+ * dtom(x) - convert data pointer within mbuf to mbuf pointer (XXX)
+ */
+#define mtod(m,t) ((t)(m)->m_data)
+/* #define dtom(x) ((struct mbuf *)((int)(x) & ~(M_SIZE-1))) */
+
+/* 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.
+ */
+
+/* XXX should union some of these! */
+/* header at beginning of each mbuf: */
+struct m_hdr {
+ struct mbuf *mh_next; /* Linked list of mbufs */
+ struct mbuf *mh_prev;
+ struct mbuf *mh_nextpkt; /* Next packet in queue/record */
+ struct mbuf *mh_prevpkt; /* Flags aren't used in the output queue */
+ int mh_flags; /* Misc flags */
+
+ int mh_size; /* Size of data */
+ struct socket *mh_so;
+
+ caddr_t mh_data; /* Location of data */
+ int mh_len; /* Amount of data in this mbuf */
+};
+
+/*
+ * 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)
+#define M_TRAILINGSPACE M_FREEROOM
+
+struct mbuf {
+ struct m_hdr m_hdr;
+ union M_dat {
+ char m_dat_[1]; /* ANSI don't like 0 sized arrays */
+ char *m_ext_;
+ } M_dat;
+};
+
+#define m_next m_hdr.mh_next
+#define m_prev m_hdr.mh_prev
+#define m_nextpkt m_hdr.mh_nextpkt
+#define m_prevpkt m_hdr.mh_prevpkt
+#define m_flags m_hdr.mh_flags
+#define m_len m_hdr.mh_len
+#define m_data m_hdr.mh_data
+#define m_size m_hdr.mh_size
+#define m_dat M_dat.m_dat_
+#define m_ext M_dat.m_ext_
+#define m_so m_hdr.mh_so
+
+#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 */
+
+/*
+ * Mbuf statistics. XXX
+ */
+
+struct mbstat {
+ int mbs_alloced; /* Number of mbufs allocated */
+
+};
+
+extern struct mbstat mbstat;
+extern int mbuf_alloced;
+extern struct mbuf m_freelist, m_usedlist;
+extern int mbuf_max;
+
+void m_init _P((void));
+void msize_init _P((void));
+struct mbuf * m_get _P((void));
+void m_free _P((struct mbuf *));
+void m_cat _P((register struct mbuf *, register struct mbuf *));
+void m_inc _P((struct mbuf *, int));
+void m_adj _P((struct mbuf *, int));
+int m_copy _P((struct mbuf *, struct mbuf *, int, int));
+struct mbuf * dtom _P((void *));
+
+#endif
diff --git a/slirp/misc.c b/slirp/misc.c
new file mode 100644
index 0000000..7f6448d
--- /dev/null
+++ b/slirp/misc.c
@@ -0,0 +1,925 @@
+/*
+ * Copyright (c) 1995 Danny Gasparovski.
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+#define WANT_SYS_IOCTL_H
+#include <slirp.h>
+
+u_int curtime, time_fasttimo, last_slowtimo, detach_time;
+u_int detach_wait = 600000; /* 10 minutes */
+
+#if 0
+int x_port = -1;
+int x_display = 0;
+int x_screen = 0;
+
+int
+show_x(buff, inso)
+ char *buff;
+ struct socket *inso;
+{
+ if (x_port < 0) {
+ lprint("X Redir: X not being redirected.\r\n");
+ } else {
+ lprint("X Redir: In sh/bash/zsh/etc. type: DISPLAY=%s:%d.%d; export DISPLAY\r\n",
+ inet_ntoa(our_addr), x_port, x_screen);
+ lprint("X Redir: In csh/tcsh/etc. type: setenv DISPLAY %s:%d.%d\r\n",
+ inet_ntoa(our_addr), x_port, x_screen);
+ if (x_display)
+ lprint("X Redir: Redirecting to display %d\r\n", x_display);
+ }
+
+ return CFG_OK;
+}
+
+
+/*
+ * XXX Allow more than one X redirection?
+ */
+void
+redir_x(inaddr, start_port, display, screen)
+ u_int32_t inaddr;
+ int start_port;
+ int display;
+ int screen;
+{
+ int i;
+
+ if (x_port >= 0) {
+ lprint("X Redir: X already being redirected.\r\n");
+ show_x(0, 0);
+ } else {
+ for (i = 6001 + (start_port-1); i <= 6100; i++) {
+ if (solisten(htons(i), inaddr, htons(6000 + display), 0)) {
+ /* Success */
+ x_port = i - 6000;
+ x_display = display;
+ x_screen = screen;
+ show_x(0, 0);
+ return;
+ }
+ }
+ lprint("X Redir: Error: Couldn't redirect a port for X. Weird.\r\n");
+ }
+}
+#endif
+
+#ifndef HAVE_INET_ATON
+int
+inet_aton(cp, ia)
+ const char *cp;
+ struct in_addr *ia;
+{
+ u_int32_t addr = inet_addr(cp);
+ if (addr == 0xffffffff)
+ return 0;
+ ia->s_addr = addr;
+ return 1;
+}
+#endif
+
+/*
+ * Get our IP address and put it in our_addr
+ */
+void
+getouraddr()
+{
+ char buff[256];
+ struct hostent *he;
+
+ if (gethostname(buff,256) < 0)
+ return;
+
+ if ((he = gethostbyname(buff)) == NULL)
+ return;
+
+ our_addr = *(struct in_addr *)he->h_addr;
+}
+
+#if SIZEOF_CHAR_P == 8
+
+struct quehead_32 {
+ u_int32_t qh_link;
+ u_int32_t qh_rlink;
+};
+
+inline void
+insque_32(a, b)
+ void *a;
+ void *b;
+{
+ register struct quehead_32 *element = (struct quehead_32 *) a;
+ register struct quehead_32 *head = (struct quehead_32 *) b;
+ element->qh_link = head->qh_link;
+ head->qh_link = (u_int32_t)element;
+ element->qh_rlink = (u_int32_t)head;
+ ((struct quehead_32 *)(element->qh_link))->qh_rlink
+ = (u_int32_t)element;
+}
+
+inline void
+remque_32(a)
+ void *a;
+{
+ register struct quehead_32 *element = (struct quehead_32 *) a;
+ ((struct quehead_32 *)(element->qh_link))->qh_rlink = element->qh_rlink;
+ ((struct quehead_32 *)(element->qh_rlink))->qh_link = element->qh_link;
+ element->qh_rlink = 0;
+}
+
+#endif /* SIZEOF_CHAR_P == 8 */
+
+struct quehead {
+ struct quehead *qh_link;
+ struct quehead *qh_rlink;
+};
+
+inline void
+insque(a, b)
+ void *a, *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(a)
+ 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;
+ /* element->qh_link = NULL; TCP FIN1 crashes if you do this. Why ? */
+}
+
+/* #endif */
+
+
+int
+add_exec(ex_ptr, do_pty, exec, addr, port)
+ struct ex_list **ex_ptr;
+ int do_pty;
+ char *exec;
+ int addr;
+ int port;
+{
+ struct ex_list *tmp_ptr;
+
+ /* First, check if the port is "bound" */
+ for (tmp_ptr = *ex_ptr; tmp_ptr; tmp_ptr = tmp_ptr->ex_next) {
+ if (port == tmp_ptr->ex_fport && addr == tmp_ptr->ex_addr)
+ return -1;
+ }
+
+ tmp_ptr = *ex_ptr;
+ *ex_ptr = (struct ex_list *)malloc(sizeof(struct ex_list));
+ (*ex_ptr)->ex_fport = port;
+ (*ex_ptr)->ex_addr = addr;
+ (*ex_ptr)->ex_pty = do_pty;
+ (*ex_ptr)->ex_exec = strdup(exec);
+ (*ex_ptr)->ex_next = tmp_ptr;
+ return 0;
+}
+
+#ifndef HAVE_STRERROR
+
+/*
+ * For systems with no strerror
+ */
+
+extern int sys_nerr;
+extern char *sys_errlist[];
+
+char *
+strerror(error)
+ int error;
+{
+ if (error < sys_nerr)
+ return sys_errlist[error];
+ else
+ return "Unknown error.";
+}
+
+#endif
+
+
+#if 0
+int
+openpty(amaster, aslave)
+ int *amaster, *aslave;
+{
+ register int master, slave;
+
+#ifdef HAVE_GRANTPT
+ char *ptr;
+
+ if ((master = open("/dev/ptmx", O_RDWR)) < 0 ||
+ grantpt(master) < 0 ||
+ unlockpt(master) < 0 ||
+ (ptr = ptsname(master)) == NULL) {
+ close(master);
+ return -1;
+ }
+
+ if ((slave = open(ptr, O_RDWR)) < 0 ||
+ ioctl(slave, I_PUSH, "ptem") < 0 ||
+ ioctl(slave, I_PUSH, "ldterm") < 0 ||
+ ioctl(slave, I_PUSH, "ttcompat") < 0) {
+ close(master);
+ close(slave);
+ return -1;
+ }
+
+ *amaster = master;
+ *aslave = slave;
+ return 0;
+
+#else
+
+ static char line[] = "/dev/ptyXX";
+ register const char *cp1, *cp2;
+
+ for (cp1 = "pqrsPQRS"; *cp1; cp1++) {
+ line[8] = *cp1;
+ for (cp2 = "0123456789abcdefghijklmnopqrstuv"; *cp2; cp2++) {
+ line[9] = *cp2;
+ if ((master = open(line, O_RDWR, 0)) == -1) {
+ if (errno == ENOENT)
+ return (-1); /* out of ptys */
+ } else {
+ line[5] = 't';
+ /* These will fail */
+ (void) chown(line, getuid(), 0);
+ (void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
+#ifdef HAVE_REVOKE
+ (void) revoke(line);
+#endif
+ if ((slave = open(line, O_RDWR, 0)) != -1) {
+ *amaster = master;
+ *aslave = slave;
+ return 0;
+ }
+ (void) close(master);
+ line[5] = 'p';
+ }
+ }
+ }
+ errno = ENOENT; /* out of ptys */
+ return (-1);
+#endif
+}
+
+/*
+ * XXX This is ugly
+ * We create and bind a socket, then fork off to another
+ * process, which connects to this socket, after which we
+ * exec the wanted program. If something (strange) happens,
+ * the accept() call could block us forever.
+ *
+ * do_pty = 0 Fork/exec inetd style
+ * do_pty = 1 Fork/exec using slirp.telnetd
+ * do_ptr = 2 Fork/exec using pty
+ */
+int
+fork_exec(so, ex, do_pty)
+ struct socket *so;
+ char *ex;
+ int do_pty;
+{
+ int s;
+ struct sockaddr_in addr;
+ int addrlen = sizeof(addr);
+ int opt;
+ int master;
+ char *argv[256];
+ char buff[256];
+ /* don't want to clobber the original */
+ char *bptr;
+ char *curarg;
+ int c, i;
+
+ DEBUG_CALL("fork_exec");
+ DEBUG_ARG("so = %lx", (long)so);
+ DEBUG_ARG("ex = %lx", (long)ex);
+ DEBUG_ARG("do_pty = %lx", (long)do_pty);
+
+ if (do_pty == 2) {
+ if (openpty(&master, &s) == -1) {
+ lprint("Error: openpty failed: %s\n", strerror(errno));
+ return 0;
+ }
+ } else {
+ addr.sin_family = AF_INET;
+ addr.sin_port = 0;
+ addr.sin_addr.s_addr = INADDR_ANY;
+
+ if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0 ||
+ bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
+ listen(s, 1) < 0) {
+ lprint("Error: inet socket: %s\n", strerror(errno));
+ close(s);
+
+ return 0;
+ }
+ }
+
+ switch(fork()) {
+ case -1:
+ lprint("Error: fork failed: %s\n", strerror(errno));
+ close(s);
+ if (do_pty == 2)
+ close(master);
+ return 0;
+
+ case 0:
+ /* Set the DISPLAY */
+ if (do_pty == 2) {
+ (void) close(master);
+#ifdef TIOCSCTTY /* XXXXX */
+ (void) setsid();
+ ioctl(s, TIOCSCTTY, (char *)NULL);
+#endif
+ } else {
+ getsockname(s, (struct sockaddr *)&addr, &addrlen);
+ close(s);
+ /*
+ * Connect to the socket
+ * XXX If any of these fail, we're in trouble!
+ */
+ s = socket(AF_INET, SOCK_STREAM, 0);
+ addr.sin_addr = loopback_addr;
+ connect(s, (struct sockaddr *)&addr, addrlen);
+ }
+
+ if (x_port >= 0) {
+#ifdef HAVE_SETENV
+ sprintf(buff, "%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
+ setenv("DISPLAY", buff, 1);
+#else
+ sprintf(buff, "DISPLAY=%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
+ putenv(buff);
+#endif
+ }
+
+ dup2(s, 0);
+ dup2(s, 1);
+ dup2(s, 2);
+ for (s = 3; s <= 255; s++)
+ close(s);
+
+ i = 0;
+ bptr = strdup(ex); /* No need to free() this */
+ if (do_pty == 1) {
+ /* Setup "slirp.telnetd -x" */
+ argv[i++] = "slirp.telnetd";
+ argv[i++] = "-x";
+ argv[i++] = bptr;
+ } else
+ do {
+ /* Change the string into argv[] */
+ curarg = bptr;
+ while (*bptr != ' ' && *bptr != (char)0)
+ bptr++;
+ c = *bptr;
+ *bptr++ = (char)0;
+ argv[i++] = strdup(curarg);
+ } while (c);
+
+ argv[i] = 0;
+ execvp(argv[0], argv);
+
+ /* Ooops, failed, let's tell the user why */
+ {
+ char buff[256];
+
+ sprintf(buff, "Error: execvp of %s failed: %s\n",
+ argv[0], strerror(errno));
+ write(2, buff, strlen(buff)+1);
+ }
+ close(0); close(1); close(2); /* XXX */
+ exit(1);
+
+ default:
+ if (do_pty == 2) {
+ close(s);
+ so->s = master;
+ } else {
+ /*
+ * XXX this could block us...
+ * XXX Should set a timer here, and if accept() doesn't
+ * return after X seconds, declare it a failure
+ * The only reason this will block forever is if socket()
+ * of connect() fail in the child process
+ */
+ so->s = accept(s, (struct sockaddr *)&addr, &addrlen);
+ close(s);
+ opt = 1;
+ setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
+ opt = 1;
+ setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
+ }
+ fd_nonblock(so->s);
+
+ /* Append the telnet options now */
+ if (so->so_m != 0 && do_pty == 1) {
+ sbappend(so, so->so_m);
+ so->so_m = 0;
+ }
+
+ return 1;
+ }
+}
+#endif
+
+#ifndef HAVE_STRDUP
+char *
+strdup(str)
+ const char *str;
+{
+ char *bptr;
+
+ bptr = (char *)malloc(strlen(str)+1);
+ strcpy(bptr, str);
+
+ return bptr;
+}
+#endif
+
+#if 0
+void
+snooze_hup(num)
+ int num;
+{
+ int s, ret;
+#ifndef NO_UNIX_SOCKETS
+ struct sockaddr_un sock_un;
+#endif
+ struct sockaddr_in sock_in;
+ char buff[256];
+
+ ret = -1;
+ if (slirp_socket_passwd) {
+ s = socket(AF_INET, SOCK_STREAM, 0);
+ if (s < 0)
+ slirp_exit(1);
+ sock_in.sin_family = AF_INET;
+ sock_in.sin_addr.s_addr = slirp_socket_addr;
+ sock_in.sin_port = htons(slirp_socket_port);
+ if (connect(s, (struct sockaddr *)&sock_in, sizeof(sock_in)) != 0)
+ slirp_exit(1); /* just exit...*/
+ sprintf(buff, "kill %s:%d", slirp_socket_passwd, slirp_socket_unit);
+ write(s, buff, strlen(buff)+1);
+ }
+#ifndef NO_UNIX_SOCKETS
+ else {
+ s = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (s < 0)
+ slirp_exit(1);
+ sock_un.sun_family = AF_UNIX;
+ strcpy(sock_un.sun_path, socket_path);
+ if (connect(s, (struct sockaddr *)&sock_un,
+ sizeof(sock_un.sun_family) + sizeof(sock_un.sun_path)) != 0)
+ slirp_exit(1);
+ sprintf(buff, "kill none:%d", slirp_socket_unit);
+ write(s, buff, strlen(buff)+1);
+ }
+#endif
+ slirp_exit(0);
+}
+
+
+void
+snooze()
+{
+ sigset_t s;
+ int i;
+
+ /* Don't need our data anymore */
+ /* XXX This makes SunOS barf */
+/* brk(0); */
+
+ /* Close all fd's */
+ for (i = 255; i >= 0; i--)
+ close(i);
+
+ signal(SIGQUIT, slirp_exit);
+ signal(SIGHUP, snooze_hup);
+ sigemptyset(&s);
+
+ /* Wait for any signal */
+ sigsuspend(&s);
+
+ /* Just in case ... */
+ exit(255);
+}
+
+void
+relay(s)
+ int s;
+{
+ char buf[8192];
+ int n;
+ fd_set readfds;
+ struct ttys *ttyp;
+
+ /* Don't need our data anymore */
+ /* XXX This makes SunOS barf */
+/* brk(0); */
+
+ signal(SIGQUIT, slirp_exit);
+ signal(SIGHUP, slirp_exit);
+ signal(SIGINT, slirp_exit);
+ signal(SIGTERM, slirp_exit);
+
+ /* Fudge to get term_raw and term_restore to work */
+ if (NULL == (ttyp = tty_attach (0, slirp_tty))) {
+ lprint ("Error: tty_attach failed in misc.c:relay()\r\n");
+ slirp_exit (1);
+ }
+ ttyp->fd = 0;
+ ttyp->flags |= TTY_CTTY;
+ term_raw(ttyp);
+
+ while (1) {
+ FD_ZERO(&readfds);
+
+ FD_SET(0, &readfds);
+ FD_SET(s, &readfds);
+
+ n = select(s+1, &readfds, (fd_set *)0, (fd_set *)0, (struct timeval *)0);
+
+ if (n <= 0)
+ slirp_exit(0);
+
+ if (FD_ISSET(0, &readfds)) {
+ n = read(0, buf, 8192);
+ if (n <= 0)
+ slirp_exit(0);
+ n = writen(s, buf, n);
+ if (n <= 0)
+ slirp_exit(0);
+ }
+
+ if (FD_ISSET(s, &readfds)) {
+ n = read(s, buf, 8192);
+ if (n <= 0)
+ slirp_exit(0);
+ n = writen(0, buf, n);
+ if (n <= 0)
+ slirp_exit(0);
+ }
+ }
+
+ /* Just in case.... */
+ exit(1);
+}
+#endif
+
+int (*lprint_print) _P((void *, const char *, va_list));
+char *lprint_ptr, *lprint_ptr2, **lprint_arg;
+
+void
+#ifdef __STDC__
+lprint(const char *format, ...)
+#else
+lprint(va_alist) va_dcl
+#endif
+{
+ va_list args;
+
+#ifdef __STDC__
+ va_start(args, format);
+#else
+ char *format;
+ va_start(args);
+ format = va_arg(args, char *);
+#endif
+#if 0
+ /* If we're printing to an sbuf, make sure there's enough room */
+ /* XXX +100? */
+ if (lprint_sb) {
+ if ((lprint_ptr - lprint_sb->sb_wptr) >=
+ (lprint_sb->sb_datalen - (strlen(format) + 100))) {
+ int deltaw = lprint_sb->sb_wptr - lprint_sb->sb_data;
+ int deltar = lprint_sb->sb_rptr - lprint_sb->sb_data;
+ int deltap = lprint_ptr - lprint_sb->sb_data;
+
+ lprint_sb->sb_data = (char *)realloc(lprint_sb->sb_data,
+ lprint_sb->sb_datalen + TCP_SNDSPACE);
+
+ /* Adjust all values */
+ lprint_sb->sb_wptr = lprint_sb->sb_data + deltaw;
+ lprint_sb->sb_rptr = lprint_sb->sb_data + deltar;
+ lprint_ptr = lprint_sb->sb_data + deltap;
+
+ lprint_sb->sb_datalen += TCP_SNDSPACE;
+ }
+ }
+#endif
+ if (lprint_print)
+ lprint_ptr += (*lprint_print)(*lprint_arg, format, args);
+
+ /* Check if they want output to be logged to file as well */
+ if (lfd) {
+ /*
+ * Remove \r's
+ * otherwise you'll get ^M all over the file
+ */
+ int len = strlen(format);
+ char *bptr1, *bptr2;
+
+ bptr1 = bptr2 = strdup(format);
+
+ while (len--) {
+ if (*bptr1 == '\r')
+ memcpy(bptr1, bptr1+1, len+1);
+ else
+ bptr1++;
+ }
+ vfprintf(lfd, bptr2, args);
+ free(bptr2);
+ }
+ va_end(args);
+}
+
+void
+add_emu(buff)
+ char *buff;
+{
+ u_int lport, fport;
+ u_int8_t tos = 0, emu = 0;
+ char buff1[256], buff2[256], buff4[128];
+ char *buff3 = buff4;
+ struct emu_t *emup;
+ struct socket *so;
+
+ if (sscanf(buff, "%256s %256s", buff2, buff1) != 2) {
+ lprint("Error: Bad arguments\r\n");
+ return;
+ }
+
+ if (sscanf(buff1, "%d:%d", &lport, &fport) != 2) {
+ lport = 0;
+ if (sscanf(buff1, "%d", &fport) != 1) {
+ lprint("Error: Bad first argument\r\n");
+ return;
+ }
+ }
+
+ if (sscanf(buff2, "%128[^:]:%128s", buff1, buff3) != 2) {
+ buff3 = 0;
+ if (sscanf(buff2, "%256s", buff1) != 1) {
+ lprint("Error: Bad second argument\r\n");
+ return;
+ }
+ }
+
+ if (buff3) {
+ if (strcmp(buff3, "lowdelay") == 0)
+ tos = IPTOS_LOWDELAY;
+ else if (strcmp(buff3, "throughput") == 0)
+ tos = IPTOS_THROUGHPUT;
+ else {
+ lprint("Error: Expecting \"lowdelay\"/\"throughput\"\r\n");
+ return;
+ }
+ }
+
+ if (strcmp(buff1, "ftp") == 0)
+ emu = EMU_FTP;
+ else if (strcmp(buff1, "irc") == 0)
+ emu = EMU_IRC;
+ else if (strcmp(buff1, "none") == 0)
+ emu = EMU_NONE; /* ie: no emulation */
+ else {
+ lprint("Error: Unknown service\r\n");
+ return;
+ }
+
+ /* First, check that it isn't already emulated */
+ for (emup = tcpemu; emup; emup = emup->next) {
+ if (emup->lport == lport && emup->fport == fport) {
+ lprint("Error: port already emulated\r\n");
+ return;
+ }
+ }
+
+ /* link it */
+ emup = (struct emu_t *)malloc(sizeof (struct emu_t));
+ emup->lport = (u_int16_t)lport;
+ emup->fport = (u_int16_t)fport;
+ emup->tos = tos;
+ emup->emu = emu;
+ emup->next = tcpemu;
+ tcpemu = emup;
+
+ /* And finally, mark all current sessions, if any, as being emulated */
+ for (so = tcb.so_next; so != &tcb; so = so->so_next) {
+ if ((lport && lport == ntohs(so->so_lport)) ||
+ (fport && fport == ntohs(so->so_fport))) {
+ if (emu)
+ so->so_emu = emu;
+ if (tos)
+ so->so_iptos = tos;
+ }
+ }
+
+ lprint("Adding emulation for %s to port %d/%d\r\n", buff1, emup->lport, emup->fport);
+}
+
+#ifdef BAD_SPRINTF
+
+#undef vsprintf
+#undef sprintf
+
+/*
+ * Some BSD-derived systems have a sprintf which returns char *
+ */
+
+int
+vsprintf_len(string, format, args)
+ char *string;
+ const char *format;
+ va_list args;
+{
+ vsprintf(string, format, args);
+ return strlen(string);
+}
+
+int
+#ifdef __STDC__
+sprintf_len(char *string, const char *format, ...)
+#else
+sprintf_len(va_alist) va_dcl
+#endif
+{
+ va_list args;
+#ifdef __STDC__
+ va_start(args, format);
+#else
+ char *string;
+ char *format;
+ va_start(args);
+ string = va_arg(args, char *);
+ format = va_arg(args, char *);
+#endif
+ vsprintf(string, format, args);
+ return strlen(string);
+}
+
+#endif
+
+void
+u_sleep(usec)
+ int usec;
+{
+ struct timeval t;
+ fd_set fdset;
+
+ FD_ZERO(&fdset);
+
+ t.tv_sec = 0;
+ t.tv_usec = usec * 1000;
+
+ select(0, &fdset, &fdset, &fdset, &t);
+}
+
+/*
+ * Set fd blocking and non-blocking
+ */
+
+void
+fd_nonblock(fd)
+ int fd;
+{
+#ifdef FIONBIO
+ int opt = 1;
+
+ ioctl(fd, FIONBIO, &opt);
+#else
+ int opt;
+
+ opt = fcntl(fd, F_GETFL, 0);
+ opt |= O_NONBLOCK;
+ fcntl(fd, F_SETFL, opt);
+#endif
+}
+
+void
+fd_block(fd)
+ int fd;
+{
+#ifdef FIONBIO
+ int opt = 0;
+
+ ioctl(fd, FIONBIO, &opt);
+#else
+ int opt;
+
+ opt = fcntl(fd, F_GETFL, 0);
+ opt &= ~O_NONBLOCK;
+ fcntl(fd, F_SETFL, opt);
+#endif
+}
+
+
+#if 0
+/*
+ * invoke RSH
+ */
+int
+rsh_exec(so,ns, user, host, args)
+ struct socket *so;
+ struct socket *ns;
+ char *user;
+ char *host;
+ char *args;
+{
+ int fd[2];
+ int fd0[2];
+ int s;
+ char buff[256];
+
+ DEBUG_CALL("rsh_exec");
+ DEBUG_ARG("so = %lx", (long)so);
+
+ if (pipe(fd)<0) {
+ lprint("Error: pipe failed: %s\n", strerror(errno));
+ return 0;
+ }
+/* #ifdef HAVE_SOCKETPAIR */
+#if 1
+ if (socketpair(PF_UNIX,SOCK_STREAM,0, fd0) == -1) {
+ close(fd[0]);
+ close(fd[1]);
+ lprint("Error: openpty failed: %s\n", strerror(errno));
+ return 0;
+ }
+#else
+ if (openpty(&fd0[0], &fd0[1]) == -1) {
+ close(fd[0]);
+ close(fd[1]);
+ lprint("Error: openpty failed: %s\n", strerror(errno));
+ return 0;
+ }
+#endif
+
+ switch(fork()) {
+ case -1:
+ lprint("Error: fork failed: %s\n", strerror(errno));
+ close(fd[0]);
+ close(fd[1]);
+ close(fd0[0]);
+ close(fd0[1]);
+ return 0;
+
+ case 0:
+ close(fd[0]);
+ close(fd0[0]);
+
+ /* Set the DISPLAY */
+ if (x_port >= 0) {
+#ifdef HAVE_SETENV
+ sprintf(buff, "%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
+ setenv("DISPLAY", buff, 1);
+#else
+ sprintf(buff, "DISPLAY=%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
+ putenv(buff);
+#endif
+ }
+
+ dup2(fd0[1], 0);
+ dup2(fd0[1], 1);
+ dup2(fd[1], 2);
+ for (s = 3; s <= 255; s++)
+ close(s);
+
+ execlp("rsh","rsh","-l", user, host, args, NULL);
+
+ /* Ooops, failed, let's tell the user why */
+
+ sprintf(buff, "Error: execlp of %s failed: %s\n",
+ "rsh", strerror(errno));
+ write(2, buff, strlen(buff)+1);
+ close(0); close(1); close(2); /* XXX */
+ exit(1);
+
+ default:
+ close(fd[1]);
+ close(fd0[1]);
+ ns->s=fd[0];
+ so->s=fd0[0];
+
+ return 1;
+ }
+}
+#endif
diff --git a/slirp/misc.h b/slirp/misc.h
new file mode 100644
index 0000000..8e2819b
--- /dev/null
+++ b/slirp/misc.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 1995 Danny Gasparovski.
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+#ifndef _MISC_H_
+#define _MISC_H_
+
+struct ex_list {
+ int ex_pty; /* Do we want a pty? */
+ int ex_addr; /* The last byte of the address */
+ int ex_fport; /* Port to telnet to */
+ char *ex_exec; /* Command line of what to exec */
+ struct ex_list *ex_next;
+};
+
+extern struct ex_list *exec_list;
+extern u_int curtime, time_fasttimo, last_slowtimo, detach_time, detach_wait;
+
+extern int (*lprint_print) _P((void *, const char *, va_list));
+extern char *lprint_ptr, *lprint_ptr2, **lprint_arg;
+extern struct sbuf *lprint_sb;
+
+#ifndef HAVE_STRDUP
+char *strdup _P((const char *));
+#endif
+
+void do_wait _P((int));
+
+#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_RSH 0x8
+
+#define EMU_NOCONNECT 0x10 /* Don't connect */
+
+/* UDP emulations */
+#define EMU_TALK 0x1
+#define EMU_NTALK 0x2
+#define EMU_CUSEEME 0x3
+
+struct tos_t {
+ u_int16_t lport;
+ u_int16_t fport;
+ u_int8_t tos;
+ u_int8_t emu;
+};
+
+struct emu_t {
+ u_int16_t lport;
+ u_int16_t fport;
+ u_int8_t tos;
+ u_int8_t emu;
+ struct emu_t *next;
+};
+
+extern struct emu_t *tcpemu;
+
+extern int x_port, x_server, x_display;
+
+int show_x _P((char *, struct socket *));
+void redir_x _P((u_int32_t, int, int, int));
+void getouraddr _P((void));
+inline void slirp_insque _P((void *, void *));
+inline void slirp_remque _P((void *));
+int add_exec _P((struct ex_list **, int, char *, int, int));
+int openpty _P((int *, int *));
+int fork_exec _P((struct socket *, char *, int));
+void snooze_hup _P((int));
+void snooze _P((void));
+void relay _P((int));
+void add_emu _P((char *));
+void u_sleep _P((int));
+void fd_nonblock _P((int));
+void fd_block _P((int));
+int rsh_exec _P((struct socket *, struct socket *, char *, char *, char *));
+
+#endif
diff --git a/slirp/sbuf.c b/slirp/sbuf.c
new file mode 100644
index 0000000..04fb97d
--- /dev/null
+++ b/slirp/sbuf.c
@@ -0,0 +1,201 @@
+/*
+ * Copyright (c) 1995 Danny Gasparovski.
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+#include <slirp.h>
+
+/* Done as a macro in socket.h */
+/* int
+ * sbspace(struct sockbuff *sb)
+ * {
+ * return SB_DATALEN - sb->sb_cc;
+ * }
+ */
+
+void
+sbfree(sb)
+ struct sbuf *sb;
+{
+ free(sb->sb_data);
+}
+
+void
+sbdrop(sb, num)
+ struct sbuf *sb;
+ int num;
+{
+ /*
+ * 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;
+
+}
+
+void
+sbreserve(sb, size)
+ 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(so, m)
+ struct socket *so;
+ struct mbuf *m;
+{
+ int ret = 0;
+
+ DEBUG_CALL("sbappend");
+ DEBUG_ARG("so = %lx", (long)so);
+ DEBUG_ARG("m = %lx", (long)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);
+ 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 = write(so->s, m->m_data, m->m_len);
+
+ 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
+ */
+void
+sbappendsb(sb, m)
+ 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(sb, off, len, to)
+ 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/sbuf.h b/slirp/sbuf.h
new file mode 100644
index 0000000..161e0bb
--- /dev/null
+++ b/slirp/sbuf.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 1995 Danny Gasparovski.
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+#ifndef _SBUF_H_
+#define _SBUF_H_
+
+#define sbflush(sb) sbdrop((sb),(sb)->sb_cc)
+#define sbspace(sb) ((sb)->sb_datalen - (sb)->sb_cc)
+
+struct sbuf {
+ u_int sb_cc; /* actual chars in buffer */
+ u_int 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 _P((struct sbuf *));
+void sbdrop _P((struct sbuf *, int));
+void sbreserve _P((struct sbuf *, int));
+void sbappend _P((struct socket *, struct mbuf *));
+void sbappendsb _P((struct sbuf *, struct mbuf *));
+void sbcopy _P((struct sbuf *, int, int, char *));
+
+#endif
diff --git a/slirp/slirp.c b/slirp/slirp.c
new file mode 100644
index 0000000..48b45a3
--- /dev/null
+++ b/slirp/slirp.c
@@ -0,0 +1,550 @@
+#include "slirp.h"
+
+/* host address */
+struct in_addr our_addr;
+/* host dns address */
+struct in_addr dns_addr;
+/* host loopback address */
+struct in_addr loopback_addr;
+
+/* address for slirp virtual addresses */
+struct in_addr special_addr;
+
+const uint8_t special_ethaddr[6] = {
+ 0x52, 0x54, 0x00, 0x12, 0x35, 0x00
+};
+
+uint8_t client_ethaddr[6];
+
+int do_slowtimo;
+int link_up;
+struct timeval tt;
+FILE *lfd;
+
+/* XXX: suppress those select globals */
+fd_set *global_readfds, *global_writefds, *global_xfds;
+
+#ifdef _WIN32
+
+static int get_dns_addr(struct in_addr *pdns_addr)
+{
+ /* XXX: add it */
+ return -1;
+}
+
+#else
+
+static int get_dns_addr(struct in_addr *pdns_addr)
+{
+ char buff[512];
+ char buff2[256];
+ FILE *f;
+ int found = 0;
+ struct in_addr tmp_addr;
+
+ f = fopen("/etc/resolv.conf", "r");
+ if (!f)
+ return -1;
+
+ lprint("IP address of your DNS(s): ");
+ while (fgets(buff, 512, f) != NULL) {
+ if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) {
+ if (!inet_aton(buff2, &tmp_addr))
+ continue;
+ if (tmp_addr.s_addr == loopback_addr.s_addr)
+ tmp_addr = our_addr;
+ /* If it's the first one, set it to dns_addr */
+ if (!found)
+ *pdns_addr = tmp_addr;
+ else
+ lprint(", ");
+ if (++found > 3) {
+ lprint("(more)");
+ break;
+ } else
+ lprint("%s", inet_ntoa(tmp_addr));
+ }
+ }
+ if (!found)
+ return -1;
+ return 0;
+}
+
+#endif
+
+void slirp_init(void)
+{
+ debug_init("/tmp/slirp.log", DEBUG_DEFAULT);
+
+ link_up = 1;
+
+ if_init();
+ ip_init();
+
+ /* Initialise mbufs *after* setting the MTU */
+ m_init();
+
+ /* set default addresses */
+ getouraddr();
+ inet_aton("127.0.0.1", &loopback_addr);
+
+ if (get_dns_addr(&dns_addr) < 0) {
+ fprintf(stderr, "Could not get DNS address\n");
+ exit(1);
+ }
+
+ inet_aton(CTL_SPECIAL, &special_addr);
+}
+
+#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)
+#define UPD_NFDS(x) if (nfds < (x)) nfds = (x)
+
+/*
+ * curtime kept to an accuracy of 1ms
+ */
+static void updtime(void)
+{
+ gettimeofday(&tt, 0);
+
+ curtime = (u_int)tt.tv_sec * (u_int)1000;
+ curtime += (u_int)tt.tv_usec / (u_int)1000;
+
+ if ((tt.tv_usec % 1000) >= 500)
+ curtime++;
+}
+
+void slirp_select_fill(int *pnfds,
+ fd_set *readfds, fd_set *writefds, fd_set *xfds)
+{
+ struct socket *so, *so_next;
+ struct timeval timeout;
+ int nfds;
+ int tmp_time;
+
+ /* fail safe */
+ global_readfds = NULL;
+ global_writefds = NULL;
+ global_xfds = NULL;
+
+ nfds = *pnfds;
+ /*
+ * First, TCP sockets
+ */
+ do_slowtimo = 0;
+ if (link_up) {
+ /*
+ * *_slowtimo needs calling if there are IP fragments
+ * in the fragment queue, or there are TCP connections active
+ */
+ do_slowtimo = ((tcb.so_next != &tcb) ||
+ ((struct ipasfrag *)&ipq != (struct ipasfrag *)ipq.next));
+
+ for (so = tcb.so_next; so != &tcb; so = so_next) {
+ so_next = so->so_next;
+
+ /*
+ * See if we need a tcp_fasttimo
+ */
+ if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK)
+ time_fasttimo = curtime; /* Flag when we 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) {
+ FD_SET(so->s, readfds);
+ UPD_NFDS(so->s);
+ continue;
+ }
+
+ /*
+ * Set for writing sockets which are connecting
+ */
+ if (so->so_state & SS_ISFCONNECTING) {
+ FD_SET(so->s, writefds);
+ UPD_NFDS(so->s);
+ 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) {
+ FD_SET(so->s, writefds);
+ UPD_NFDS(so->s);
+ }
+
+ /*
+ * 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))) {
+ FD_SET(so->s, readfds);
+ FD_SET(so->s, xfds);
+ UPD_NFDS(so->s);
+ }
+ }
+
+ /*
+ * UDP sockets
+ */
+ for (so = udb.so_next; so != &udb; so = so_next) {
+ so_next = so->so_next;
+
+ /*
+ * See if it's timed out
+ */
+ if (so->so_expire) {
+ if (so->so_expire <= curtime) {
+ udp_detach(so);
+ continue;
+ } else
+ do_slowtimo = 1; /* 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) {
+ FD_SET(so->s, readfds);
+ UPD_NFDS(so->s);
+ }
+ }
+ }
+
+ /*
+ * Setup timeout to use minimum CPU usage, especially when idle
+ */
+
+ /*
+ * First, see the timeout needed by *timo
+ */
+ timeout.tv_sec = 0;
+ timeout.tv_usec = -1;
+ /*
+ * If a slowtimo is needed, set timeout to 500ms from the last
+ * slow timeout. If a fast timeout is needed, set timeout within
+ * 200ms of when it was requested.
+ */
+ if (do_slowtimo) {
+ /* XXX + 10000 because some select()'s aren't that accurate */
+ timeout.tv_usec = ((500 - (curtime - last_slowtimo)) * 1000) + 10000;
+ if (timeout.tv_usec < 0)
+ timeout.tv_usec = 0;
+ else if (timeout.tv_usec > 510000)
+ timeout.tv_usec = 510000;
+
+ /* Can only fasttimo if we also slowtimo */
+ if (time_fasttimo) {
+ tmp_time = (200 - (curtime - time_fasttimo)) * 1000;
+ if (tmp_time < 0)
+ tmp_time = 0;
+
+ /* Choose the smallest of the 2 */
+ if (tmp_time < timeout.tv_usec)
+ timeout.tv_usec = (u_int)tmp_time;
+ }
+ }
+ *pnfds = nfds;
+}
+
+void slirp_select_poll(fd_set *readfds, fd_set *writefds, fd_set *xfds)
+{
+ struct socket *so, *so_next;
+ int ret;
+
+ global_readfds = readfds;
+ global_writefds = writefds;
+ global_xfds = xfds;
+
+ /* Update time */
+ updtime();
+
+ /*
+ * See if anything has timed out
+ */
+ if (link_up) {
+ if (time_fasttimo && ((curtime - time_fasttimo) >= 199)) {
+ tcp_fasttimo();
+ time_fasttimo = 0;
+ }
+ if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) {
+ ip_slowtimo();
+ tcp_slowtimo();
+ last_slowtimo = curtime;
+ }
+ }
+
+ /*
+ * Check sockets
+ */
+ if (link_up) {
+ /*
+ * Check TCP sockets
+ */
+ for (so = tcb.so_next; so != &tcb; so = so_next) {
+ so_next = so->so_next;
+
+ /*
+ * FD_ISSET is meaningless on these sockets
+ * (and they can crash the program)
+ */
+ 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 readfds below if this succeeds
+ */
+ if (FD_ISSET(so->s, xfds))
+ sorecvoob(so);
+ /*
+ * Check sockets for reading
+ */
+ else if (FD_ISSET(so->s, readfds)) {
+ /*
+ * 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));
+ }
+
+ /*
+ * Check sockets for writing
+ */
+ if (FD_ISSET(so->s, writefds)) {
+ /*
+ * Check for non-blocking, still-connecting sockets
+ */
+ if (so->so_state & SS_ISFCONNECTING) {
+ /* Connected */
+ so->so_state &= ~SS_ISFCONNECTING;
+
+ ret = write(so->s, &ret, 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_NOFDREF;
+ }
+ /* else so->so_state &= ~SS_ISFCONNECTING; */
+
+ /*
+ * Continue tcp_input
+ */
+ tcp_input((struct mbuf *)NULL, sizeof(struct ip), so);
+ /* continue; */
+ } else
+ ret = sowrite(so);
+ /*
+ * XXXXX If we wrote something (a lot), there
+ * could be a need for a window update.
+ * In the worst case, the remote will send
+ * a window probe to get things going again
+ */
+ }
+
+ /*
+ * Probe a still-connecting, non-blocking socket
+ * to check if it's still alive
+ */
+#ifdef PROBE_CONN
+ if (so->so_state & SS_ISFCONNECTING) {
+ ret = read(so->s, (char *)&ret, 0);
+
+ if (ret < 0) {
+ /* XXX */
+ if (errno == EAGAIN || errno == EWOULDBLOCK ||
+ errno == EINPROGRESS || errno == ENOTCONN)
+ continue; /* Still connecting, continue */
+
+ /* else failed */
+ so->so_state = SS_NOFDREF;
+
+ /* tcp_input will take care of it */
+ } else {
+ ret = write(so->s, &ret, 0);
+ if (ret < 0) {
+ /* XXX */
+ if (errno == EAGAIN || errno == EWOULDBLOCK ||
+ errno == EINPROGRESS || errno == ENOTCONN)
+ continue;
+ /* else failed */
+ so->so_state = SS_NOFDREF;
+ } else
+ so->so_state &= ~SS_ISFCONNECTING;
+
+ }
+ tcp_input((struct mbuf *)NULL, sizeof(struct ip),so);
+ } /* SS_ISFCONNECTING */
+#endif
+ }
+
+ /*
+ * Now UDP sockets.
+ * Incoming packets are sent straight away, they're not buffered.
+ * Incoming UDP data isn't buffered either.
+ */
+ for (so = udb.so_next; so != &udb; so = so_next) {
+ so_next = so->so_next;
+
+ if (so->s != -1 && FD_ISSET(so->s, readfds)) {
+ sorecvfrom(so);
+ }
+ }
+ }
+
+ /*
+ * See if we can start outputting
+ */
+ if (if_queued && link_up)
+ if_start();
+}
+
+#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 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 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 */
+ unsigned char ar_sip[4]; /* sender IP address */
+ unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
+ unsigned char ar_tip[4]; /* target IP address */
+};
+
+void arp_input(const uint8_t *pkt, int pkt_len)
+{
+ struct ethhdr *eh = (struct ethhdr *)pkt;
+ struct arphdr *ah = (struct arphdr *)(pkt + ETH_HLEN);
+ uint8_t arp_reply[ETH_HLEN + sizeof(struct arphdr)];
+ struct ethhdr *reh = (struct ethhdr *)arp_reply;
+ struct arphdr *rah = (struct arphdr *)(arp_reply + ETH_HLEN);
+ int ar_op;
+
+ ar_op = ntohs(ah->ar_op);
+ switch(ar_op) {
+ case ARPOP_REQUEST:
+ if (!memcmp(ah->ar_tip, &special_addr, 3) &&
+ (ah->ar_tip[3] == CTL_DNS || ah->ar_tip[3] == CTL_ALIAS)) {
+
+ /* XXX: make an ARP request to have the client address */
+ memcpy(client_ethaddr, eh->h_source, ETH_ALEN);
+
+ /* ARP request for alias/dns mac address */
+ memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN);
+ memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1);
+ reh->h_source[5] = ah->ar_tip[3];
+ 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);
+ memcpy(rah->ar_sip, ah->ar_tip, 4);
+ memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
+ memcpy(rah->ar_tip, ah->ar_sip, 4);
+ slirp_output(arp_reply, sizeof(arp_reply));
+ }
+ break;
+ default:
+ break;
+ }
+}
+
+void slirp_input(const uint8_t *pkt, int pkt_len)
+{
+ struct mbuf *m;
+ int proto;
+
+ if (pkt_len < ETH_HLEN)
+ return;
+
+ proto = ntohs(*(uint16_t *)(pkt + 12));
+ switch(proto) {
+ case ETH_P_ARP:
+ arp_input(pkt, pkt_len);
+ break;
+ case ETH_P_IP:
+ m = m_get();
+ if (!m)
+ return;
+ m->m_len = pkt_len;
+ memcpy(m->m_data, pkt, pkt_len);
+
+ m->m_data += ETH_HLEN;
+ m->m_len -= ETH_HLEN;
+
+ ip_input(m);
+ break;
+ default:
+ break;
+ }
+}
+
+/* output the IP packet to the ethernet device */
+void if_encap(const uint8_t *ip_data, int ip_data_len)
+{
+ uint8_t buf[1600];
+ struct ethhdr *eh = (struct ethhdr *)buf;
+
+ if (ip_data_len + ETH_HLEN > sizeof(buf))
+ return;
+
+ memcpy(eh->h_dest, client_ethaddr, ETH_ALEN);
+ memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 1);
+ eh->h_source[5] = CTL_ALIAS;
+ eh->h_proto = htons(ETH_P_IP);
+ memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len);
+ slirp_output(buf, ip_data_len + ETH_HLEN);
+}
diff --git a/slirp/slirp.h b/slirp/slirp.h
new file mode 100644
index 0000000..c2fa86e
--- /dev/null
+++ b/slirp/slirp.h
@@ -0,0 +1,308 @@
+#ifndef __COMMON_H__
+#define __COMMON_H__
+
+#define CONFIG_QEMU
+
+#define DEBUG 1
+
+#ifndef CONFIG_QEMU
+#include "version.h"
+#endif
+#include "config.h"
+#include "slirp_config.h"
+
+#include <sys/types.h>
+#ifdef HAVE_SYS_BITYPES_H
+# include <sys/bitypes.h>
+#endif
+
+#ifdef NEED_TYPEDEFS
+typedef char int8_t;
+typedef unsigned char u_int8_t;
+
+# if SIZEOF_SHORT == 2
+ typedef short int16_t;
+ typedef unsigned short u_int16_t;
+# else
+# if SIZEOF_INT == 2
+ typedef int int16_t;
+ typedef unsigned int u_int16_t;
+# else
+ #error Cannot find a type with sizeof() == 2
+# endif
+# endif
+
+# if SIZEOF_SHORT == 4
+ typedef short int32_t;
+ typedef unsigned short u_int32_t;
+# else
+# if SIZEOF_INT == 4
+ typedef int int32_t;
+ typedef unsigned int u_int32_t;
+# else
+ #error Cannot find a type with sizeof() == 4
+# endif
+# endif
+#endif /* NEED_TYPEDEFS */
+
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#ifdef HAVE_STDLIB_H
+# include <stdlib.h>
+#endif
+
+#include <stdio.h>
+#include <errno.h>
+
+#ifndef HAVE_MEMMOVE
+#define memmove(x, y, z) bcopy(y, x, z)
+#endif
+
+#if TIME_WITH_SYS_TIME
+# include <sys/time.h>
+# include <time.h>
+#else
+# if HAVE_SYS_TIME_H
+# include <sys/time.h>
+# else
+# include <time.h>
+# endif
+#endif
+
+#ifdef HAVE_STRING_H
+# include <string.h>
+#else
+# include <strings.h>
+#endif
+
+#include <sys/uio.h>
+
+#ifndef _P
+#ifndef NO_PROTOTYPES
+# define _P(x) x
+#else
+# define _P(x) ()
+#endif
+#endif
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#ifdef GETTIMEOFDAY_ONE_ARG
+#define gettimeofday(x, y) gettimeofday(x)
+#endif
+
+/* Systems lacking strdup() definition in <string.h>. */
+#if defined(ultrix)
+char *strdup _P((const char *));
+#endif
+
+/* Systems lacking malloc() definition in <stdlib.h>. */
+#if defined(ultrix) || defined(hcx)
+void *malloc _P((size_t arg));
+void free _P((void *ptr));
+#endif
+
+#ifndef HAVE_INET_ATON
+int inet_aton _P((const char *cp, struct in_addr *ia));
+#endif
+
+#include <fcntl.h>
+#ifndef NO_UNIX_SOCKETS
+#include <sys/un.h>
+#endif
+#include <signal.h>
+#ifdef HAVE_SYS_SIGNAL_H
+# include <sys/signal.h>
+#endif
+#include <sys/socket.h>
+
+#if defined(WANT_SYS_IOCTL_H) && defined(HAVE_SYS_IOCTL_H)
+# include <sys/ioctl.h>
+#else
+# define WANT_SYS_TERMIOS_H
+#endif
+
+#ifdef WANT_SYS_TERMIOS_H
+# ifndef INCLUDED_TERMIOS_H
+# ifdef HAVE_TERMIOS_H
+# include <termios.h>
+# else
+# include <termio.h>
+# endif
+# define INCLUDED_TERMIOS_H
+# endif
+#endif
+
+
+
+#ifdef HAVE_SYS_SELECT_H
+# include <sys/select.h>
+#endif
+
+#ifdef HAVE_SYS_WAIT_H
+# include <sys/wait.h>
+#endif
+
+#ifdef HAVE_SYS_FILIO_H
+# include <sys/filio.h>
+#endif
+
+#ifdef USE_PPP
+#include <ppp/slirppp.h>
+#endif
+
+#ifdef __STDC__
+#include <stdarg.h>
+#else
+#include <varargs.h>
+#endif
+
+#include <sys/stat.h>
+
+/* Avoid conflicting with the libc insque() and remque(), which
+ have different prototypes. */
+#define insque slirp_insque
+#define remque slirp_remque
+
+#ifdef HAVE_SYS_STROPTS_H
+#include <sys/stropts.h>
+#endif
+
+#include "debug.h"
+
+#include "ip.h"
+#include "tcp.h"
+#include "tcp_timer.h"
+#include "tcp_var.h"
+#include "tcpip.h"
+#include "udp.h"
+#include "icmp_var.h"
+#include "mbuf.h"
+#include "sbuf.h"
+#include "socket.h"
+#include "if.h"
+#include "main.h"
+#include "misc.h"
+#include "ctl.h"
+#ifdef USE_PPP
+#include "ppp/pppd.h"
+#include "ppp/ppp.h"
+#endif
+
+#include "bootp.h"
+#include "libslirp.h"
+
+extern struct ttys *ttys_unit[MAX_INTERFACES];
+
+#ifndef NULL
+#define NULL (void *)0
+#endif
+
+#ifndef FULL_BOLT
+void if_start _P((void));
+#else
+void if_start _P((struct ttys *));
+#endif
+
+#ifdef BAD_SPRINTF
+# define vsprintf vsprintf_len
+# define sprintf sprintf_len
+ extern int vsprintf_len _P((char *, const char *, va_list));
+ extern int sprintf_len _P((char *, const char *, ...));
+#endif
+
+#ifdef DECLARE_SPRINTF
+# ifndef BAD_SPRINTF
+ extern int vsprintf _P((char *, const char *, va_list));
+# endif
+ extern int vfprintf _P((FILE *, const char *, va_list));
+#endif
+
+#ifndef HAVE_STRERROR
+ extern char *strerror _P((int error));
+#endif
+
+#ifndef HAVE_INDEX
+ char *index _P((const char *, int));
+#endif
+
+#ifndef HAVE_GETHOSTID
+ long gethostid _P((void));
+#endif
+
+void lprint _P((const char *, ...));
+
+extern int do_echo;
+
+#if SIZEOF_CHAR_P == 4
+# define insque_32 insque
+# define remque_32 remque
+#else
+ inline void insque_32 _P((void *, void *));
+ inline void remque_32 _P((void *));
+#endif
+
+#include <pwd.h>
+#include <netdb.h>
+
+#define DEFAULT_BAUD 115200
+
+/* cksum.c */
+int cksum(struct mbuf *m, int len);
+
+/* if.c */
+void if_init _P((void));
+void if_output _P((struct socket *, struct mbuf *));
+
+/* ip_input.c */
+void ip_init _P((void));
+void ip_input _P((struct mbuf *));
+struct ip * ip_reass _P((register struct ipasfrag *, register struct ipq *));
+void ip_freef _P((struct ipq *));
+void ip_enq _P((register struct ipasfrag *, register struct ipasfrag *));
+void ip_deq _P((register struct ipasfrag *));
+void ip_slowtimo _P((void));
+void ip_stripoptions _P((register struct mbuf *, struct mbuf *));
+
+/* ip_output.c */
+int ip_output _P((struct socket *, struct mbuf *));
+
+/* tcp_input.c */
+int tcp_reass _P((register struct tcpcb *, register struct tcpiphdr *, struct mbuf *));
+void tcp_input _P((register struct mbuf *, int, struct socket *));
+void tcp_dooptions _P((struct tcpcb *, u_char *, int, struct tcpiphdr *));
+void tcp_xmit_timer _P((register struct tcpcb *, int));
+int tcp_mss _P((register struct tcpcb *, u_int));
+
+/* tcp_output.c */
+int tcp_output _P((register struct tcpcb *));
+void tcp_setpersist _P((register struct tcpcb *));
+
+/* tcp_subr.c */
+void tcp_init _P((void));
+void tcp_template _P((struct tcpcb *));
+void tcp_respond _P((struct tcpcb *, register struct tcpiphdr *, register struct mbuf *, tcp_seq, tcp_seq, int));
+struct tcpcb * tcp_newtcpcb _P((struct socket *));
+struct tcpcb * tcp_close _P((register struct tcpcb *));
+void tcp_drain _P((void));
+void tcp_sockclosed _P((struct tcpcb *));
+int tcp_fconnect _P((struct socket *));
+void tcp_connect _P((struct socket *));
+int tcp_attach _P((struct socket *));
+u_int8_t tcp_tos _P((struct socket *));
+int tcp_emu _P((struct socket *, struct mbuf *));
+int tcp_ctl _P((struct socket *));
+struct tcpcb *tcp_drop(struct tcpcb *tp, int errno);
+
+#ifdef USE_PPP
+#define MIN_MRU MINMRU
+#define MAX_MRU MAXMRU
+#else
+#define MIN_MRU 128
+#define MAX_MRU 16384
+#endif
+
+#endif
diff --git a/slirp/slirp_config.h b/slirp/slirp_config.h
new file mode 100644
index 0000000..51fc951
--- /dev/null
+++ b/slirp/slirp_config.h
@@ -0,0 +1,186 @@
+/*
+ * User definable configuration options
+ */
+
+/* Undefine if you don't want talk emulation */
+#undef EMULATE_TALK
+
+/* Define if you want the connection to be probed */
+/* XXX Not working yet, so ignore this for now */
+#undef PROBE_CONN
+
+/* Define to 1 if you want KEEPALIVE timers */
+#define DO_KEEPALIVE 0
+
+/* Define to MAX interfaces you expect to use at once */
+/* MAX_INTERFACES determines the max. TOTAL number of interfaces (SLIP and PPP) */
+/* MAX_PPP_INTERFACES determines max. number of PPP interfaces */
+#define MAX_INTERFACES 1
+#define MAX_PPP_INTERFACES 1
+
+/* Define if you want slirp's socket in /tmp */
+/* XXXXXX Do this in ./configure */
+#undef USE_TMPSOCKET
+
+/* Define if you want slirp to use cfsetXspeed() on the terminal */
+#undef DO_CFSETSPEED
+
+/* Define this if you want slirp to write to the tty as fast as it can */
+/* This should only be set if you are using load-balancing, slirp does a */
+/* pretty good job on single modems already, and seting this will make */
+/* interactive sessions less responsive */
+/* XXXXX Talk about having fast modem as unit 0 */
+#undef FULL_BOLT
+
+/*
+ * Define if you want slirp to use less CPU
+ * You will notice a small lag in interactive sessions, but it's not that bad
+ * Things like Netscape/ftp/etc. are completely unaffected
+ * This is mainly for sysadmins who have many slirp users
+ */
+#undef USE_LOWCPU
+
+/* Define this if your compiler doesn't like prototypes */
+#ifndef __STDC__
+#define NO_PROTOTYPES
+#endif
+
+/*********************************************************/
+/*
+ * Autoconf defined configuration options
+ * You shouldn't need to touch any of these
+ */
+
+/* Ignore this */
+#undef DUMMY_PPP
+
+/* Define if you have unistd.h */
+#define HAVE_UNISTD_H
+
+/* Define if you have stdlib.h */
+#define HAVE_STDLIB_H
+
+/* Define if you have sys/ioctl.h */
+#undef HAVE_SYS_IOCTL_H
+
+/* Define if you have sys/filio.h */
+#undef HAVE_SYS_FILIO_H
+
+/* Define if you have strerror */
+#define HAVE_STRERROR
+
+/* Define if you have strdup() */
+#define HAVE_STRDUP
+
+/* Define according to how time.h should be included */
+#define TIME_WITH_SYS_TIME 0
+#undef HAVE_SYS_TIME_H
+
+/* Define if you have sys/bitypes.h */
+#undef HAVE_SYS_BITYPES_H
+
+/* Define if the machine is big endian */
+//#undef WORDS_BIGENDIAN
+
+/* Define if your sprintf returns char * instead of int */
+#undef BAD_SPRINTF
+
+/* Define if you have readv */
+#undef HAVE_READV
+
+/* Define if iovec needs to be declared */
+#undef DECLARE_IOVEC
+
+/* Define if a declaration of sprintf/fprintf is needed */
+#undef DECLARE_SPRINTF
+
+/* Define if you have a POSIX.1 sys/wait.h */
+#undef HAVE_SYS_WAIT_H
+
+/* Define if you have sys/select.h */
+#define HAVE_SYS_SELECT_H
+
+/* Define if you have strings.h */
+#define HAVE_STRING_H
+
+/* Define if you have arpa/inet.h */
+#define HAVE_ARPA_INET_H
+
+/* Define if you have sys/signal.h */
+#undef HAVE_SYS_SIGNAL_H
+
+/* Define if you have sys/stropts.h */
+#undef HAVE_SYS_STROPTS_H
+
+/* Define to whatever your compiler thinks inline should be */
+#define inline inline
+
+/* Define to whatever your compiler thinks const should be */
+#define const const
+
+/* Define if your compiler doesn't like prototypes */
+#undef NO_PROTOTYPES
+
+/* Define if you don't have u_int32_t etc. typedef'd */
+#undef NEED_TYPEDEFS
+
+/* Define to sizeof(char) */
+#define SIZEOF_CHAR 1
+
+/* Define to sizeof(short) */
+#define SIZEOF_SHORT 2
+
+/* Define to sizeof(int) */
+#define SIZEOF_INT 4
+
+/* Define to sizeof(char *) */
+/* XXX: patch it */
+#define SIZEOF_CHAR_P 4
+
+/* Define if you have random() */
+#undef HAVE_RANDOM
+
+/* Define if you have srandom() */
+#undef HAVE_SRANDOM
+
+/* Define if you have inet_aton */
+#define HAVE_INET_ATON
+
+/* Define if you have setenv */
+#undef HAVE_SETENV
+
+/* Define if you have index() */
+#undef HAVE_INDEX
+
+/* Define if you have bcmp() */
+#undef HAVE_BCMP
+
+/* Define if you have drand48 */
+#undef HAVE_DRAND48
+
+/* Define if you have memmove */
+#define HAVE_MEMMOVE
+
+/* Define if you have <termios.h> */
+#undef HAVE_TERMIOS_H
+
+/* Define if you have gethostid */
+#undef HAVE_GETHOSTID
+
+/* Define if you DON'T have unix-domain sockets */
+#undef NO_UNIX_SOCKETS
+
+/* Define if gettimeofday only takes one argument */
+#undef GETTIMEOFDAY_ONE_ARG
+
+/* Define if you have revoke() */
+#undef HAVE_REVOKE
+
+/* Define if you have the sysv method of opening pty's (/dev/ptmx, etc.) */
+#undef HAVE_GRANTPT
+
+/* Define if you have fchmod */
+#undef HAVE_FCHMOD
+
+/* Define if you have <sys/type32.h> */
+#undef HAVE_SYS_TYPES32_H
diff --git a/slirp/socket.c b/slirp/socket.c
new file mode 100644
index 0000000..396fb4a
--- /dev/null
+++ b/slirp/socket.c
@@ -0,0 +1,696 @@
+/*
+ * Copyright (c) 1995 Danny Gasparovski.
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+#define WANT_SYS_IOCTL_H
+#include <slirp.h>
+#include "ip_icmp.h"
+#include "main.h"
+
+void
+so_init()
+{
+ /* Nothing yet */
+}
+
+
+struct socket *
+solookup(head, laddr, lport, faddr, fport)
+ struct socket *head;
+ struct in_addr laddr;
+ u_int lport;
+ struct in_addr faddr;
+ u_int fport;
+{
+ struct socket *so;
+
+ for (so = head->so_next; so != head; so = so->so_next) {
+ if (so->so_lport == lport &&
+ so->so_laddr.s_addr == laddr.s_addr &&
+ so->so_faddr.s_addr == faddr.s_addr &&
+ so->so_fport == fport)
+ break;
+ }
+
+ if (so == head)
+ return (struct socket *)NULL;
+ return so;
+
+}
+
+/*
+ * 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()
+{
+ struct socket *so;
+
+ so = (struct socket *)malloc(sizeof(struct socket));
+ if(so) {
+ memset(so, 0, sizeof(struct socket));
+ so->so_state = SS_NOFDREF;
+ so->s = -1;
+ }
+ return(so);
+}
+
+/*
+ * remque and free a socket, clobber cache
+ */
+void
+sofree(so)
+ struct socket *so;
+{
+ if (so->so_emu==EMU_RSH && so->extra) {
+ sofree(so->extra);
+ so->extra=NULL;
+ }
+ if (so == tcp_last_so)
+ tcp_last_so = &tcb;
+ else if (so == udp_last_so)
+ udp_last_so = &udb;
+
+ m_free(so->so_m);
+
+ if(so->so_next && so->so_prev)
+ remque(so); /* crashes if so is not in a queue */
+
+ free(so);
+}
+
+/*
+ * 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(so)
+ struct socket *so;
+{
+ int n, nn, lss, total;
+ struct sbuf *sb = &so->so_snd;
+ int len = sb->sb_datalen - sb->sb_cc;
+ struct iovec iov[2];
+ int mss = so->so_tcpcb->t_maxseg;
+
+ DEBUG_CALL("soread");
+ DEBUG_ARG("so = %lx", (long )so);
+
+ /*
+ * No need to check if there's enough room to read.
+ * soread wouldn't have been called if there weren't
+ */
+
+ len = sb->sb_datalen - sb->sb_cc;
+
+ iov[0].iov_base = sb->sb_wptr;
+ 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;
+ }
+ }
+
+#ifdef HAVE_READV
+ nn = readv(so->s, (struct iovec *)iov, n);
+ DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
+#else
+ nn = read(so->s, iov[0].iov_base, iov[0].iov_len);
+#endif
+ if (nn <= 0) {
+ if (nn < 0 && (errno == EINTR || errno == EAGAIN))
+ return 0;
+ else {
+ DEBUG_MISC((dfd, " --- soread() disconnected, nn = %d, errno = %d-%s\n", nn, errno,strerror(errno)));
+ sofcantrcvmore(so);
+ tcp_sockclosed(sototcpcb(so));
+ return -1;
+ }
+ }
+
+#ifndef HAVE_READV
+ /*
+ * 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 wont (shouldn't) happen, since it didn't happen above
+ */
+ if (n == 2 && nn == iov[0].iov_len)
+ nn += read(so->s, iov[1].iov_base, iov[1].iov_len);
+
+ DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
+#endif
+
+ /* 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;
+}
+
+/*
+ * 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
+ */
+void
+sorecvoob(so)
+ struct socket *so;
+{
+ struct tcpcb *tp = sototcpcb(so);
+
+ DEBUG_CALL("sorecvoob");
+ DEBUG_ARG("so = %lx", (long)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.
+ */
+ soread(so);
+ tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
+ tp->t_force = 1;
+ tcp_output(tp);
+ tp->t_force = 0;
+}
+
+/*
+ * Send urgent data
+ * There's a lot duplicated code here, but...
+ */
+int
+sosendoob(so)
+ struct socket *so;
+{
+ struct sbuf *sb = &so->so_rcv;
+ char buff[2048]; /* XXX Shouldn't be sending more oob data than this */
+
+ int n, len;
+
+ DEBUG_CALL("sosendoob");
+ DEBUG_ARG("so = %lx", (long)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 = send(so->s, sb->sb_rptr, so->so_urgc, (MSG_OOB)); /* |MSG_DONTWAIT)); */
+ so->so_urgc -= n;
+
+ DEBUG_MISC((dfd, " --- sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
+ } else {
+ /*
+ * Since there's no sendv or sendtov like writev,
+ * we must copy all data to a linear buffer then
+ * send it all
+ */
+ len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
+ if (len > so->so_urgc) len = so->so_urgc;
+ memcpy(buff, sb->sb_rptr, len);
+ so->so_urgc -= len;
+ if (so->so_urgc) {
+ n = sb->sb_wptr - sb->sb_data;
+ if (n > so->so_urgc) n = so->so_urgc;
+ memcpy((buff + len), sb->sb_data, n);
+ so->so_urgc -= n;
+ len += n;
+ }
+ n = send(so->s, buff, len, (MSG_OOB)); /* |MSG_DONTWAIT)); */
+#ifdef DEBUG
+ if (n != len)
+ DEBUG_ERROR((dfd, "Didn't send all data urgently XXXXX\n"));
+#endif
+ DEBUG_MISC((dfd, " ---2 sent %d bytes urgent data, %d urgent bytes left\n", 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(so)
+ 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 = %lx", (long)so);
+
+ if (so->so_urgc) {
+ sosendoob(so);
+ if (sb->sb_cc == 0)
+ return 0;
+ }
+
+ /*
+ * No need to check if there's something to write,
+ * sowrite wouldn't have been called otherwise
+ */
+
+ len = sb->sb_cc;
+
+ iov[0].iov_base = sb->sb_rptr;
+ 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 */
+
+#ifdef HAVE_READV
+ nn = writev(so->s, (const struct iovec *)iov, n);
+
+ DEBUG_MISC((dfd, " ... wrote nn = %d bytes\n", nn));
+#else
+ nn = write(so->s, iov[0].iov_base, iov[0].iov_len);
+#endif
+ /* This should never happen, but people tell me it does *shrug* */
+ if (nn < 0 && (errno == EAGAIN || errno == EINTR))
+ return 0;
+
+ if (nn <= 0) {
+ DEBUG_MISC((dfd, " --- sowrite disconnected, so->so_state = %x, errno = %d\n",
+ so->so_state, errno));
+ sofcantsendmore(so);
+ tcp_sockclosed(sototcpcb(so));
+ return -1;
+ }
+
+#ifndef HAVE_READV
+ if (n == 2 && nn == iov[0].iov_len)
+ nn += write(so->s, iov[1].iov_base, iov[1].iov_len);
+ DEBUG_MISC((dfd, " ... wrote nn = %d bytes\n", nn));
+#endif
+
+ /* 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;
+}
+
+/*
+ * recvfrom() a UDP socket
+ */
+void
+sorecvfrom(so)
+ struct socket *so;
+{
+ struct sockaddr_in addr;
+ int addrlen = sizeof(struct sockaddr_in);
+
+ DEBUG_CALL("sorecvfrom");
+ DEBUG_ARG("so = %lx", (long)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) {
+ u_char code=ICMP_UNREACH_PORT;
+
+ if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
+ else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
+
+ DEBUG_MISC((dfd," udp icmp rx errno = %d-%s\n",
+ errno,strerror(errno)));
+ icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
+ } else {
+ icmp_reflect(so->so_m);
+ so->so_m = 0; /* 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, n;
+
+ if (!(m = m_get())) return;
+ m->m_data += if_maxlinkhdr;
+
+ /*
+ * 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)) { */
+ ioctl(so->s, FIONREAD, &n);
+
+ 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((dfd, " did recvfrom %d, errno = %d-%s\n",
+ m->m_len, errno,strerror(errno)));
+ if(m->m_len<0) {
+ u_char code=ICMP_UNREACH_PORT;
+
+ if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
+ else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
+
+ DEBUG_MISC((dfd," rx error, tx icmp ICMP_UNREACH:%i\n", code));
+ icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
+ 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 (m->m_len == len) {
+ * m_inc(m, MINCSIZE);
+ * m->m_len = 0;
+ * }
+ */
+
+ /*
+ * If this packet was destined for CTL_ADDR,
+ * make it look like that's where it came from, done by udp_output
+ */
+ udp_output(so, m, &addr);
+ } /* rx error */
+ } /* if ping packet */
+}
+
+/*
+ * sendto() a socket
+ */
+int
+sosendto(so, m)
+ struct socket *so;
+ struct mbuf *m;
+{
+ int ret;
+ struct sockaddr_in addr;
+
+ DEBUG_CALL("sosendto");
+ DEBUG_ARG("so = %lx", (long)so);
+ DEBUG_ARG("m = %lx", (long)m);
+
+ addr.sin_family = AF_INET;
+ if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
+ /* It's an alias */
+ switch(ntohl(so->so_faddr.s_addr) & 0xff) {
+ case CTL_DNS:
+ addr.sin_addr = dns_addr;
+ break;
+ case CTL_ALIAS:
+ default:
+ addr.sin_addr = loopback_addr;
+ break;
+ }
+ } else
+ addr.sin_addr = so->so_faddr;
+ addr.sin_port = so->so_fport;
+
+ DEBUG_MISC((dfd, " sendto()ing, addr.sin_port=%d, addr.sin_addr.s_addr=%.16s\n", ntohs(addr.sin_port), inet_ntoa(addr.sin_addr)));
+
+ /* Don't care what port we get */
+ ret = sendto(so->s, m->m_data, m->m_len, 0,
+ (struct sockaddr *)&addr, sizeof (struct sockaddr));
+ 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_ISFCONNECTED; /* So that it gets select()ed */
+ return 0;
+}
+
+/*
+ * XXX This should really be tcp_listen
+ */
+struct socket *
+solisten(port, laddr, lport, flags)
+ u_int port;
+ u_int32_t laddr;
+ u_int lport;
+ int flags;
+{
+ struct sockaddr_in addr;
+ struct socket *so;
+ int s, addrlen = sizeof(addr), opt = 1;
+
+ DEBUG_CALL("solisten");
+ DEBUG_ARG("port = %d", port);
+ DEBUG_ARG("laddr = %x", laddr);
+ DEBUG_ARG("lport = %d", lport);
+ DEBUG_ARG("flags = %x", flags);
+
+ if ((so = socreate()) == NULL) {
+ /* free(so); Not sofree() ??? free(NULL) == NOP */
+ return NULL;
+ }
+
+ /* Don't tcp_attach... we don't need so_snd nor so_rcv */
+ if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL) {
+ free(so);
+ return NULL;
+ }
+ insque(so,&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_FACCEPTCONN|flags);
+ 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 = INADDR_ANY;
+ addr.sin_port = port;
+
+ if (((s = socket(AF_INET,SOCK_STREAM,0)) < 0) ||
+ (bind(s,(struct sockaddr *)&addr, sizeof(addr)) < 0) ||
+ (listen(s,1) < 0)) {
+ int tmperrno = errno; /* Don't clobber the real reason we failed */
+
+ close(s);
+ sofree(so);
+ /* Restore the real errno */
+ errno = tmperrno;
+ return NULL;
+ }
+ setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
+ setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
+
+ getsockname(s,(struct sockaddr *)&addr,&addrlen);
+ 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 = our_addr;
+ else
+ so->so_faddr = addr.sin_addr;
+
+ so->s = s;
+ return so;
+}
+
+/*
+ * Data is available in so_rcv
+ * Just write() the data to the socket
+ * XXX not yet...
+ */
+void
+sorwakeup(so)
+ struct socket *so;
+{
+/* sowrite(so); */
+/* FD_CLR(so->s,&writefds); */
+}
+
+/*
+ * Data has been freed in so_snd
+ * We have room for a read() if we want to
+ * For now, don't read, it'll be done in the main loop
+ */
+void
+sowwakeup(so)
+ struct socket *so;
+{
+ /* Nothing, yet */
+}
+
+/*
+ * 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(so)
+ register 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(so)
+ register struct socket *so;
+{
+ so->so_state &= ~(SS_ISFCONNECTING|SS_FWDRAIN|SS_NOFDREF);
+ so->so_state |= SS_ISFCONNECTED; /* Clobber other states */
+}
+
+void
+sofcantrcvmore(so)
+ struct socket *so;
+{
+ if ((so->so_state & SS_NOFDREF) == 0) {
+ shutdown(so->s,0);
+ FD_CLR(so->s, global_writefds);
+ }
+ so->so_state &= ~(SS_ISFCONNECTING);
+ if (so->so_state & SS_FCANTSENDMORE)
+ so->so_state = SS_NOFDREF; /* Don't select it */ /* XXX close() here as well? */
+ else
+ so->so_state |= SS_FCANTRCVMORE;
+}
+
+void
+sofcantsendmore(so)
+ struct socket *so;
+{
+ if ((so->so_state & SS_NOFDREF) == 0) {
+ shutdown(so->s,1); /* send FIN to fhost */
+ FD_CLR(so->s, global_readfds);
+ FD_CLR(so->s, global_xfds);
+ }
+ so->so_state &= ~(SS_ISFCONNECTING);
+ if (so->so_state & SS_FCANTRCVMORE)
+ so->so_state = SS_NOFDREF; /* as above */
+ else
+ so->so_state |= SS_FCANTSENDMORE;
+}
+
+void
+soisfdisconnected(so)
+ struct socket *so;
+{
+/* so->so_state &= ~(SS_ISFCONNECTING|SS_ISFCONNECTED); */
+/* close(so->s); */
+/* so->so_state = SS_ISFDISCONNECTED; */
+ /*
+ * XXX Do nothing ... ?
+ */
+}
+
+/*
+ * Set write drain mode
+ * Set CANTSENDMORE once all data has been write()n
+ */
+void
+sofwdrain(so)
+ struct socket *so;
+{
+ if (so->so_rcv.sb_cc)
+ so->so_state |= SS_FWDRAIN;
+ else
+ sofcantsendmore(so);
+}
+
diff --git a/slirp/socket.h b/slirp/socket.h
new file mode 100644
index 0000000..d05354c
--- /dev/null
+++ b/slirp/socket.h
@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 1995 Danny Gasparovski.
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+/* MINE */
+
+#ifndef _SLIRP_SOCKET_H_
+#define _SLIRP_SOCKET_H_
+
+#define SO_EXPIRE 240000
+#define SO_EXPIREFAST 10000
+
+/*
+ * Our socket structure
+ */
+
+struct socket {
+ struct socket *so_next,*so_prev; /* For a linked list of sockets */
+
+ int s; /* The actual socket */
+
+ /* 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 */
+ int so_urgc;
+ struct in_addr so_faddr; /* foreign host table entry */
+ struct in_addr so_laddr; /* local host table entry */
+ u_int16_t so_fport; /* foreign port */
+ u_int16_t so_lport; /* local port */
+
+ u_int8_t so_iptos; /* Type of service */
+ u_int8_t so_emu; /* Is the socket emulated? */
+
+ u_char so_type; /* Type of socket, UDP or TCP */
+ int so_state; /* internal state flags SS_*, below */
+
+ struct tcpcb *so_tcpcb; /* pointer to TCP protocol control block */
+ u_int 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 */
+ void * extra; /* Extra pointer */
+};
+
+
+/*
+ * 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_ISFDISCONNECTED 0x020*/ /* Socket has disconnected from peer, in 2MSL state */
+#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 */
+
+extern struct socket tcb;
+
+
+#if defined(DECLARE_IOVEC) && !defined(HAVE_READV)
+struct iovec {
+ char *iov_base;
+ size_t iov_len;
+};
+#endif
+
+void so_init _P((void));
+struct socket * solookup _P((struct socket *, struct in_addr, u_int, struct in_addr, u_int));
+struct socket * socreate _P((void));
+void sofree _P((struct socket *));
+int soread _P((struct socket *));
+void sorecvoob _P((struct socket *));
+int sosendoob _P((struct socket *));
+int sowrite _P((struct socket *));
+void sorecvfrom _P((struct socket *));
+int sosendto _P((struct socket *, struct mbuf *));
+struct socket * solisten _P((u_int, u_int32_t, u_int, int));
+void sorwakeup _P((struct socket *));
+void sowwakeup _P((struct socket *));
+void soisfconnecting _P((register struct socket *));
+void soisfconnected _P((register struct socket *));
+void sofcantrcvmore _P((struct socket *));
+void sofcantsendmore _P((struct socket *));
+void soisfdisconnected _P((struct socket *));
+void sofwdrain _P((struct socket *));
+
+#endif /* _SOCKET_H_ */
diff --git a/slirp/tcp.h b/slirp/tcp.h
new file mode 100644
index 0000000..3e0b4dd
--- /dev/null
+++ b/slirp/tcp.h
@@ -0,0 +1,169 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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_
+
+typedef u_int32_t tcp_seq;
+
+#define PR_SLOWHZ 2 /* 2 slow timeouts per second (approx) */
+#define PR_FASTHZ 5 /* 5 fast timeouts per second (not important) */
+
+extern int tcp_rcvspace;
+extern int tcp_sndspace;
+extern struct socket *tcp_last_so;
+
+#define TCP_SNDSPACE 8192
+#define TCP_RCVSPACE 8192
+
+/*
+ * TCP header.
+ * Per RFC 793, September, 1981.
+ */
+struct tcphdr {
+ u_int16_t th_sport; /* source port */
+ u_int16_t th_dport; /* destination port */
+ tcp_seq th_seq; /* sequence number */
+ tcp_seq th_ack; /* acknowledgement number */
+#ifdef WORDS_BIGENDIAN
+ u_int th_off:4, /* data offset */
+ th_x2:4; /* (unused) */
+#else
+ u_int th_x2:4, /* (unused) */
+ th_off:4; /* data offset */
+#endif
+ u_int8_t th_flags;
+#define TH_FIN 0x01
+#define TH_SYN 0x02
+#define TH_RST 0x04
+#define TH_PUSH 0x08
+#define TH_ACK 0x10
+#define TH_URG 0x20
+ u_int16_t th_win; /* window */
+ u_int16_t th_sum; /* checksum */
+ u_int16_t th_urp; /* urgent pointer */
+};
+
+#include "tcp_var.h"
+
+#define TCPOPT_EOL 0
+#define TCPOPT_NOP 1
+#define TCPOPT_MAXSEG 2
+#define TCPOLEN_MAXSEG 4
+#define TCPOPT_WINDOW 3
+#define TCPOLEN_WINDOW 3
+#define TCPOPT_SACK_PERMITTED 4 /* Experimental */
+#define TCPOLEN_SACK_PERMITTED 2
+#define TCPOPT_SACK 5 /* Experimental */
+#define TCPOPT_TIMESTAMP 8
+#define TCPOLEN_TIMESTAMP 10
+#define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
+
+#define TCPOPT_TSTAMP_HDR \
+ (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
+
+/*
+ * 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)).
+ */
+#define TCP_MSS 512
+
+#define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
+
+#define TCP_MAX_WINSHIFT 14 /* maximum window shift */
+
+/*
+ * User-settable options (used with setsockopt).
+ */
+/* #define TCP_NODELAY 0x01 */ /* don't delay send to coalesce packets */
+/* #define TCP_MAXSEG 0x02 */ /* set maximum segment size */
+
+/*
+ * 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 */
+
+extern tcp_seq tcp_iss; /* tcp initial send seq # */
+
+extern char *tcpstates[];
+
+#endif
diff --git a/slirp/tcp_input.c b/slirp/tcp_input.c
new file mode 100644
index 0000000..eeee985
--- /dev/null
+++ b/slirp/tcp_input.c
@@ -0,0 +1,1745 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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.
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+#include <slirp.h>
+#include "ip_icmp.h"
+
+struct socket tcb;
+
+#define min(x,y) ((x) < (y) ? (x) : (y))
+#define max(x,y) ((x) > (y) ? (x) : (y))
+
+int tcprexmtthresh = 3;
+struct socket *tcp_last_so = &tcb;
+
+tcp_seq tcp_iss; /* tcp initial send seq # */
+
+#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).
+ */
+#ifdef TCP_ACK_HACK
+#define TCP_REASS(tp, ti, m, so, flags) {\
+ if ((ti)->ti_seq == (tp)->rcv_nxt && \
+ (tp)->seg_next == (tcpiphdrp_32)(tp) && \
+ (tp)->t_state == TCPS_ESTABLISHED) {\
+ if (ti->ti_flags & TH_PUSH) \
+ tp->t_flags |= TF_ACKNOW; \
+ else \
+ tp->t_flags |= TF_DELACK; \
+ (tp)->rcv_nxt += (ti)->ti_len; \
+ flags = (ti)->ti_flags & TH_FIN; \
+ tcpstat.tcps_rcvpack++;\
+ tcpstat.tcps_rcvbyte += (ti)->ti_len;\
+ if (so->so_emu) { \
+ if (tcp_emu((so),(m))) sbappend((so), (m)); \
+ } else \
+ sbappend((so), (m)); \
+/* sorwakeup(so); */ \
+ } else {\
+ (flags) = tcp_reass((tp), (ti), (m)); \
+ tp->t_flags |= TF_ACKNOW; \
+ } \
+}
+#else
+#define TCP_REASS(tp, ti, m, so, flags) { \
+ if ((ti)->ti_seq == (tp)->rcv_nxt && \
+ (tp)->seg_next == (tcpiphdrp_32)(tp) && \
+ (tp)->t_state == TCPS_ESTABLISHED) { \
+ tp->t_flags |= TF_DELACK; \
+ (tp)->rcv_nxt += (ti)->ti_len; \
+ flags = (ti)->ti_flags & TH_FIN; \
+ tcpstat.tcps_rcvpack++;\
+ tcpstat.tcps_rcvbyte += (ti)->ti_len;\
+ if (so->so_emu) { \
+ if (tcp_emu((so),(m))) sbappend(so, (m)); \
+ } else \
+ sbappend((so), (m)); \
+/* sorwakeup(so); */ \
+ } else { \
+ (flags) = tcp_reass((tp), (ti), (m)); \
+ tp->t_flags |= TF_ACKNOW; \
+ } \
+}
+#endif
+
+int
+tcp_reass(tp, ti, m)
+ 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==0 after become established to
+ * force pre-ESTABLISHED data up to user socket.
+ */
+ if (ti == 0)
+ goto present;
+
+ /*
+ * Find a segment which begins after this one does.
+ */
+ for (q = (struct tcpiphdr *)tp->seg_next; q != (struct tcpiphdr *)tp;
+ q = (struct tcpiphdr *)q->ti_next)
+ 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 ((struct tcpiphdr *)q->ti_prev != (struct tcpiphdr *)tp) {
+ register int i;
+ q = (struct tcpiphdr *)q->ti_prev;
+ /* 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) {
+ tcpstat.tcps_rcvduppack++;
+ tcpstat.tcps_rcvdupbyte += ti->ti_len;
+ m_freem(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 = (struct tcpiphdr *)(q->ti_next);
+ }
+ tcpstat.tcps_rcvoopack++;
+ tcpstat.tcps_rcvoobyte += ti->ti_len;
+ REASS_MBUF(ti) = (mbufp_32) m; /* XXX */
+
+ /*
+ * While we overlap succeeding segments trim them or,
+ * if they are completely covered, dequeue them.
+ */
+ while (q != (struct tcpiphdr *)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((struct mbuf *) REASS_MBUF(q), i);
+ break;
+ }
+ q = (struct tcpiphdr *)q->ti_next;
+ m = (struct mbuf *) REASS_MBUF((struct tcpiphdr *)q->ti_prev);
+ remque_32((void *)(q->ti_prev));
+ m_freem(m);
+ }
+
+ /*
+ * Stick new segment in its place.
+ */
+ insque_32(ti, (void *)(q->ti_prev));
+
+present:
+ /*
+ * Present data to user, advancing rcv_nxt through
+ * completed sequence space.
+ */
+ if (!TCPS_HAVEESTABLISHED(tp->t_state))
+ return (0);
+ ti = (struct tcpiphdr *) tp->seg_next;
+ if (ti == (struct tcpiphdr *)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_32(ti);
+ m = (struct mbuf *) REASS_MBUF(ti); /* XXX */
+ ti = (struct tcpiphdr *)ti->ti_next;
+/* if (so->so_state & SS_FCANTRCVMORE) */
+ if (so->so_state & SS_FCANTSENDMORE)
+ m_freem(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);
+/* sorwakeup(so); */
+ return (flags);
+}
+
+/*
+ * TCP input routine, follows pages 65-76 of the
+ * protocol specification dated September, 1981 very closely.
+ */
+void
+tcp_input(m, iphlen, inso)
+ register struct mbuf *m;
+ int iphlen;
+ struct socket *inso;
+{
+ struct ip save_ip, *ip;
+ register struct tcpiphdr *ti;
+ caddr_t optp = NULL;
+ int optlen = 0;
+ int len, tlen, off;
+ register struct tcpcb *tp = 0;
+ register int tiflags;
+ struct socket *so = 0;
+ int todrop, acked, ourfinisacked, needoutput = 0;
+/* int dropsocket = 0; */
+ int iss = 0;
+ u_long tiwin;
+ int ret;
+/* int ts_present = 0; */
+
+ DEBUG_CALL("tcp_input");
+ DEBUG_ARGS((dfd," m = %8lx iphlen = %2d inso = %lx\n",
+ (long )m, iphlen, (long )inso ));
+
+ /*
+ * If called with m == 0, then we're continuing the connect
+ */
+ if (m == NULL) {
+ so = inso;
+
+ /* Re-set a few variables */
+ tp = sototcpcb(so);
+ m = so->so_m;
+ so->so_m = 0;
+ ti = so->so_ti;
+ tiwin = ti->ti_win;
+ tiflags = ti->ti_flags;
+
+ goto cont_conn;
+ }
+
+
+ tcpstat.tcps_rcvtotal++;
+ /*
+ * Get IP and TCP header together in first mbuf.
+ * Note: IP leaves IP header in first mbuf.
+ */
+ ti = mtod(m, struct tcpiphdr *);
+ 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.
+ */
+ ip=mtod(m, struct ip *);
+ save_ip = *ip;
+ save_ip.ip_len+= iphlen;
+
+ /*
+ * Checksum extended TCP header and data.
+ */
+ tlen = ((struct ip *)ti)->ip_len;
+ ti->ti_next = ti->ti_prev = 0;
+ ti->ti_x1 = 0;
+ ti->ti_len = htons((u_int16_t)tlen);
+ len = sizeof(struct ip ) + tlen;
+ /* keep checksum for ICMP reply
+ * ti->ti_sum = cksum(m, len);
+ * if (ti->ti_sum) { */
+ if(cksum(m, len)) {
+ tcpstat.tcps_rcvbadsum++;
+ 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) {
+ tcpstat.tcps_rcvbadoff++;
+ goto drop;
+ }
+ tlen -= off;
+ ti->ti_len = tlen;
+ if (off > sizeof (struct tcphdr)) {
+ optlen = off - sizeof (struct tcphdr);
+ optp = mtod(m, caddr_t) + sizeof (struct tcpiphdr);
+
+ /*
+ * Do quick retrieval of timestamp options ("options
+ * prediction?"). If timestamp is the only option and it's
+ * formatted as recommended in RFC 1323 appendix A, we
+ * quickly get the values now and not bother calling
+ * tcp_dooptions(), etc.
+ */
+/* if ((optlen == TCPOLEN_TSTAMP_APPA ||
+ * (optlen > TCPOLEN_TSTAMP_APPA &&
+ * optp[TCPOLEN_TSTAMP_APPA] == TCPOPT_EOL)) &&
+ * *(u_int32_t *)optp == htonl(TCPOPT_TSTAMP_HDR) &&
+ * (ti->ti_flags & TH_SYN) == 0) {
+ * ts_present = 1;
+ * ts_val = ntohl(*(u_int32_t *)(optp + 4));
+ * ts_ecr = ntohl(*(u_int32_t *)(optp + 8));
+ * optp = NULL; / * we've parsed the options * /
+ * }
+ */
+ }
+ 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:
+ so = tcp_last_so;
+ if (so->so_fport != ti->ti_dport ||
+ so->so_lport != ti->ti_sport ||
+ so->so_laddr.s_addr != ti->ti_src.s_addr ||
+ so->so_faddr.s_addr != ti->ti_dst.s_addr) {
+ so = solookup(&tcb, ti->ti_src, ti->ti_sport,
+ ti->ti_dst, ti->ti_dport);
+ if (so)
+ tcp_last_so = so;
+ ++tcpstat.tcps_socachemiss;
+ }
+
+ /*
+ * 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 == 0) {
+ if ((tiflags & (TH_SYN|TH_FIN|TH_RST|TH_URG|TH_ACK)) != TH_SYN)
+ goto dropwithreset;
+
+ if ((so = socreate()) == NULL)
+ goto dropwithreset;
+ if (tcp_attach(so) < 0) {
+ 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);
+
+ /* tcp_last_so = so; */ /* XXX ? */
+ /* tp = sototcpcb(so); */
+
+ so->so_laddr = ti->ti_src;
+ so->so_lport = ti->ti_sport;
+ so->so_faddr = ti->ti_dst;
+ so->so_fport = ti->ti_dport;
+
+ if ((so->so_iptos = tcp_tos(so)) == 0)
+ so->so_iptos = ((struct ip *)ti)->ip_tos;
+
+ 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 == 0)
+ goto dropwithreset;
+ if (tp->t_state == TCPS_CLOSED)
+ goto drop;
+
+ /* Unscale the window into a 32-bit value. */
+/* if ((tiflags & TH_SYN) == 0)
+ * tiwin = ti->ti_win << tp->snd_scale;
+ * else
+ */
+ tiwin = ti->ti_win;
+
+ /*
+ * Segment received on connection.
+ * Reset idle time and keep-alive timer.
+ */
+ tp->t_idle = 0;
+ if (so_options)
+ tp->t_timer[TCPT_KEEP] = tcp_keepintvl;
+ else
+ tp->t_timer[TCPT_KEEP] = tcp_keepidle;
+
+ /*
+ * 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, (u_char *)optp, optlen, ti);
+/* , */
+/* &ts_present, &ts_val, &ts_ecr); */
+
+ /*
+ * 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 &&
+/* (!ts_present || TSTMP_GEQ(ts_val, tp->ts_recent)) && */
+ ti->ti_seq == tp->rcv_nxt &&
+ tiwin && tiwin == tp->snd_wnd &&
+ tp->snd_nxt == tp->snd_max) {
+ /*
+ * If last ACK falls within this segment's sequence numbers,
+ * record the timestamp.
+ */
+/* if (ts_present && SEQ_LEQ(ti->ti_seq, tp->last_ack_sent) &&
+ * SEQ_LT(tp->last_ack_sent, ti->ti_seq + ti->ti_len)) {
+ * tp->ts_recent_age = tcp_now;
+ * tp->ts_recent = ts_val;
+ * }
+ */
+ 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.
+ */
+ ++tcpstat.tcps_predack;
+/* if (ts_present)
+ * tcp_xmit_timer(tp, tcp_now-ts_ecr+1);
+ * else
+ */ 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;
+ tcpstat.tcps_rcvackpack++;
+ tcpstat.tcps_rcvackbyte += acked;
+ sbdrop(&so->so_snd, acked);
+ tp->snd_una = ti->ti_ack;
+ m_freem(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;
+
+ /*
+ * There's room in so_snd, sowwakup will read()
+ * from the socket if we can
+ */
+/* if (so->so_snd.sb_flags & SB_NOTIFY)
+ * sowwakeup(so);
+ */
+ /*
+ * 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 &&
+ tp->seg_next == (tcpiphdrp_32)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.
+ */
+ ++tcpstat.tcps_preddat;
+ tp->rcv_nxt += ti->ti_len;
+ tcpstat.tcps_rcvpack++;
+ tcpstat.tcps_rcvbyte += ti->ti_len;
+ /*
+ * Add data to socket buffer.
+ */
+ if (so->so_emu) {
+ if (tcp_emu(so,m)) sbappend(so, m);
+ } else
+ sbappend(so, m);
+
+ /*
+ * XXX This is called when data arrives. Later, check
+ * if we can actually write() to the socket
+ * XXX Need to check? It's be NON_BLOCKING
+ */
+/* sorwakeup(so); */
+
+ /*
+ * If this is a short packet, then ACK now - with Nagel
+ * congestion avoidance sender won't send more until
+ * he gets an ACK.
+ *
+ * Here are 3 interpretations of what should happen.
+ * The best (for me) is to delay-ack everything except
+ * if it's a one-byte packet containing an ESC
+ * (this means it's an arrow key (or similar) sent using
+ * Nagel, hence there will be no echo)
+ * The first of these is the original, the second is the
+ * middle ground between the other 2
+ */
+/* if (((unsigned)ti->ti_len < tp->t_maxseg)) {
+ */
+/* if (((unsigned)ti->ti_len < tp->t_maxseg &&
+ * (so->so_iptos & IPTOS_LOWDELAY) == 0) ||
+ * ((so->so_iptos & IPTOS_LOWDELAY) &&
+ * ((struct tcpiphdr_2 *)ti)->first_char == (char)27)) {
+ */
+ if ((unsigned)ti->ti_len == 1 &&
+ ((struct tcpiphdr_2 *)ti)->first_char == (char)27) {
+ tp->t_flags |= TF_ACKNOW;
+ tcp_output(tp);
+ } else {
+ tp->t_flags |= TF_DELACK;
+ }
+ 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
+ */
+ if ((so->so_faddr.s_addr&htonl(0xffffff00)) == special_addr.s_addr) {
+ int lastbyte=ntohl(so->so_faddr.s_addr) & 0xff;
+ if (lastbyte!=CTL_ALIAS && lastbyte!=CTL_DNS) {
+#if 0
+ if(lastbyte==CTL_CMD || lastbyte==CTL_EXEC) {
+ /* Command or exec adress */
+ so->so_state |= SS_CTL;
+ } else {
+ /* May be an add exec */
+ struct ex_list *ex_ptr;
+
+ for(ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
+ if(ex_ptr->ex_fport == so->so_fport &&
+ lastbyte == ex_ptr->ex_addr) {
+ so->so_state |= SS_CTL;
+ break;
+ }
+ }
+ }
+ if(so->so_state & SS_CTL) goto cont_input;
+#endif
+ }
+ /* 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) == -1 && errno != EINPROGRESS) {
+ u_char code=ICMP_UNREACH_NET;
+ DEBUG_MISC((dfd," tcp fconnect errno = %d-%s\n",
+ 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);
+ } else {
+ if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
+ 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);
+ *ip=save_ip;
+ icmp_error(m, ICMP_UNREACH,code, 0,strerror(errno));
+ }
+ tp = 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;
+ }
+ 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, (u_char *)optp, optlen, ti);
+ /* , */
+ /* &ts_present, &ts_val, &ts_ecr); */
+
+ if (iss)
+ tp->iss = iss;
+ else
+ tp->iss = tcp_iss;
+ 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;
+ tcpstat.tcps_accepts++;
+ 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)
+ tp = 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)) {
+ tcpstat.tcps_connects++;
+ soisfconnected(so);
+ tp->t_state = TCPS_ESTABLISHED;
+
+ /* Do window scaling on this connection? */
+/* if ((tp->t_flags & (TF_RCVD_SCALE|TF_REQ_SCALE)) ==
+ * (TF_RCVD_SCALE|TF_REQ_SCALE)) {
+ * tp->snd_scale = tp->requested_s_scale;
+ * tp->rcv_scale = tp->request_r_scale;
+ * }
+ */
+ (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;
+ tcpstat.tcps_rcvpackafterwin++;
+ tcpstat.tcps_rcvbyteafterwin += todrop;
+ }
+ 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.
+ * First check timestamp, if present.
+ * Then 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.
+ *
+ * RFC 1323 PAWS: If we have a timestamp reply on this segment
+ * and it's less than ts_recent, drop it.
+ */
+/* if (ts_present && (tiflags & TH_RST) == 0 && tp->ts_recent &&
+ * TSTMP_LT(ts_val, tp->ts_recent)) {
+ *
+ */ /* Check to see if ts_recent is over 24 days old. */
+/* if ((int)(tcp_now - tp->ts_recent_age) > TCP_PAWS_IDLE) {
+ */ /*
+ * * Invalidate ts_recent. If this segment updates
+ * * ts_recent, the age will be reset later and ts_recent
+ * * will get a valid value. If it does not, setting
+ * * ts_recent to zero will at least satisfy the
+ * * requirement that zero be placed in the timestamp
+ * * echo reply when ts_recent isn't valid. The
+ * * age isn't reset until we get a valid ts_recent
+ * * because we don't want out-of-order segments to be
+ * * dropped when ts_recent is old.
+ * */
+/* tp->ts_recent = 0;
+ * } else {
+ * tcpstat.tcps_rcvduppack++;
+ * tcpstat.tcps_rcvdupbyte += ti->ti_len;
+ * tcpstat.tcps_pawsdrop++;
+ * goto dropafterack;
+ * }
+ * }
+ */
+
+ 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;
+ tcpstat.tcps_rcvduppack++;
+ tcpstat.tcps_rcvdupbyte += todrop;
+ } else {
+ tcpstat.tcps_rcvpartduppack++;
+ tcpstat.tcps_rcvpartdupbyte += todrop;
+ }
+ 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);
+ tcpstat.tcps_rcvafterclose++;
+ 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) {
+ tcpstat.tcps_rcvpackafterwin++;
+ if (todrop >= ti->ti_len) {
+ tcpstat.tcps_rcvbyteafterwin += 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;
+ tcpstat.tcps_rcvwinprobe++;
+ } else
+ goto dropafterack;
+ } else
+ tcpstat.tcps_rcvbyteafterwin += todrop;
+ m_adj(m, -todrop);
+ ti->ti_len -= todrop;
+ tiflags &= ~(TH_PUSH|TH_FIN);
+ }
+
+ /*
+ * If last ACK falls within this segment's sequence numbers,
+ * record its timestamp.
+ */
+/* if (ts_present && SEQ_LEQ(ti->ti_seq, tp->last_ack_sent) &&
+ * SEQ_LT(tp->last_ack_sent, ti->ti_seq + ti->ti_len +
+ * ((tiflags & (TH_SYN|TH_FIN)) != 0))) {
+ * tp->ts_recent_age = tcp_now;
+ * tp->ts_recent = ts_val;
+ * }
+ */
+
+ /*
+ * 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:
+/* so->so_error = ECONNREFUSED; */
+ goto close;
+
+ case TCPS_ESTABLISHED:
+ case TCPS_FIN_WAIT_1:
+ case TCPS_FIN_WAIT_2:
+ case TCPS_CLOSE_WAIT:
+/* so->so_error = ECONNRESET; */
+ close:
+ tp->t_state = TCPS_CLOSED;
+ tcpstat.tcps_drops++;
+ tp = tcp_close(tp);
+ goto drop;
+
+ case TCPS_CLOSING:
+ case TCPS_LAST_ACK:
+ case TCPS_TIME_WAIT:
+ tp = 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;
+ tcpstat.tcps_connects++;
+ 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_NOFDREF; /* CTL_CMD */
+ } else {
+ needoutput = 1;
+ tp->t_state = TCPS_FIN_WAIT_1;
+ }
+ } else {
+ soisfconnected(so);
+ }
+
+ /* Do window scaling? */
+/* if ((tp->t_flags & (TF_RCVD_SCALE|TF_REQ_SCALE)) ==
+ * (TF_RCVD_SCALE|TF_REQ_SCALE)) {
+ * tp->snd_scale = tp->requested_s_scale;
+ * tp->rcv_scale = tp->request_r_scale;
+ * }
+ */
+ (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) {
+ tcpstat.tcps_rcvdupack++;
+ DEBUG_MISC((dfd," dup ack m = %lx so = %lx \n",
+ (long )m, (long )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;
+ u_int 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)) {
+ tcpstat.tcps_rcvacktoomuch++;
+ goto dropafterack;
+ }
+ acked = ti->ti_ack - tp->snd_una;
+ tcpstat.tcps_rcvackpack++;
+ tcpstat.tcps_rcvackbyte += acked;
+
+ /*
+ * If we have a timestamp reply, update smoothed
+ * round trip time. If no timestamp is present but
+ * 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 (ts_present)
+ * tcp_xmit_timer(tp, tcp_now-ts_ecr+1);
+ * else
+ */
+ 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 u_int cw = tp->snd_cwnd;
+ register u_int 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;
+ sbdrop(&so->so_snd, (int )so->so_snd.sb_cc);
+ ourfinisacked = 1;
+ } else {
+ sbdrop(&so->so_snd, acked);
+ tp->snd_wnd -= acked;
+ ourfinisacked = 0;
+ }
+ /*
+ * XXX sowwakup is called when data is acked and there's room for
+ * for more data... it should read() the socket
+ */
+/* if (so->so_snd.sb_flags & SB_NOTIFY)
+ * sowwakeup(so);
+ */
+ 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) {
+ soisfdisconnected(so);
+ 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;
+ soisfdisconnected(so);
+ }
+ 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) {
+ tp = 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))))) {
+ /* keep track of pure window updates */
+ if (ti->ti_len == 0 &&
+ tp->snd_wl2 == ti->ti_ack && tiwin > tp->snd_wnd)
+ tcpstat.tcps_rcvwinupd++;
+ 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:
+
+ /*
+ * 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);
+ /*
+ * Note the amount of data that peer has sent into
+ * our window, in order to estimate the sender's
+ * buffer size.
+ */
+ len = so->so_rcv.sb_datalen - (tp->rcv_adv - tp->rcv_nxt);
+ } 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.
+ */
+/* sofcantrcvmore(so); */
+ 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;
+ soisfdisconnected(so);
+ 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;
+ }
+ }
+
+ /*
+ * If this is a small packet, then ACK now - with Nagel
+ * congestion avoidance sender won't send more until
+ * he gets an ACK.
+ *
+ * See above.
+ */
+/* if (ti->ti_len && (unsigned)ti->ti_len < tp->t_maxseg) {
+ */
+/* if ((ti->ti_len && (unsigned)ti->ti_len < tp->t_maxseg &&
+ * (so->so_iptos & IPTOS_LOWDELAY) == 0) ||
+ * ((so->so_iptos & IPTOS_LOWDELAY) &&
+ * ((struct tcpiphdr_2 *)ti)->first_char == (char)27)) {
+ */
+ if (ti->ti_len && (unsigned)ti->ti_len <= 5 &&
+ ((struct tcpiphdr_2 *)ti)->first_char == (char)27) {
+ tp->t_flags |= TF_ACKNOW;
+ }
+
+ /*
+ * 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_freem(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);
+ 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);
+ }
+
+ return;
+
+drop:
+ /*
+ * Drop space held by incoming segment and return.
+ */
+ m_free(m);
+
+ return;
+}
+
+ /* , ts_present, ts_val, ts_ecr) */
+/* int *ts_present;
+ * u_int32_t *ts_val, *ts_ecr;
+ */
+void
+tcp_dooptions(tp, cp, cnt, ti)
+ struct tcpcb *tp;
+ u_char *cp;
+ int cnt;
+ struct tcpiphdr *ti;
+{
+ u_int16_t mss;
+ int opt, optlen;
+
+ DEBUG_CALL("tcp_dooptions");
+ DEBUG_ARGS((dfd," tp = %lx cnt=%i \n", (long )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;
+
+/* case TCPOPT_WINDOW:
+ * if (optlen != TCPOLEN_WINDOW)
+ * continue;
+ * if (!(ti->ti_flags & TH_SYN))
+ * continue;
+ * tp->t_flags |= TF_RCVD_SCALE;
+ * tp->requested_s_scale = min(cp[2], TCP_MAX_WINSHIFT);
+ * break;
+ */
+/* case TCPOPT_TIMESTAMP:
+ * if (optlen != TCPOLEN_TIMESTAMP)
+ * continue;
+ * *ts_present = 1;
+ * memcpy((char *) ts_val, (char *)cp + 2, sizeof(*ts_val));
+ * NTOHL(*ts_val);
+ * memcpy((char *) ts_ecr, (char *)cp + 6, sizeof(*ts_ecr));
+ * NTOHL(*ts_ecr);
+ *
+ */ /*
+ * * A timestamp received in a SYN makes
+ * * it ok to send timestamp requests and replies.
+ * */
+/* if (ti->ti_flags & TH_SYN) {
+ * tp->t_flags |= TF_RCVD_TSTMP;
+ * tp->ts_recent = *ts_val;
+ * tp->ts_recent_age = tcp_now;
+ * }
+ */ break;
+ }
+ }
+}
+
+
+/*
+ * Pull out of band byte out of a segment so
+ * it doesn't appear in the user's data queue.
+ * It is still reflected in the segment length for
+ * sequencing purposes.
+ */
+
+#ifdef notdef
+
+void
+tcp_pulloutofband(so, ti, m)
+ struct socket *so;
+ struct tcpiphdr *ti;
+ register struct mbuf *m;
+{
+ int cnt = ti->ti_urp - 1;
+
+ while (cnt >= 0) {
+ if (m->m_len > cnt) {
+ char *cp = mtod(m, caddr_t) + cnt;
+ struct tcpcb *tp = sototcpcb(so);
+
+ tp->t_iobc = *cp;
+ tp->t_oobflags |= TCPOOB_HAVEDATA;
+ memcpy(sp, cp+1, (unsigned)(m->m_len - cnt - 1));
+ m->m_len--;
+ return;
+ }
+ cnt -= m->m_len;
+ m = m->m_next; /* XXX WRONG! Fix it! */
+ if (m == 0)
+ break;
+ }
+ panic("tcp_pulloutofband");
+}
+
+#endif /* notdef */
+
+/*
+ * Collect new round-trip time estimate
+ * and update averages and current timeout.
+ */
+
+void
+tcp_xmit_timer(tp, rtt)
+ register struct tcpcb *tp;
+ int rtt;
+{
+ register short delta;
+
+ DEBUG_CALL("tcp_xmit_timer");
+ DEBUG_ARG("tp = %lx", (long)tp);
+ DEBUG_ARG("rtt = %d", rtt);
+
+ tcpstat.tcps_rttupdated++;
+ 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(tp, offer)
+ register struct tcpcb *tp;
+ u_int offer;
+{
+ struct socket *so = tp->t_socket;
+ int mss;
+
+ DEBUG_CALL("tcp_mss");
+ DEBUG_ARG("tp = %lx", (long)tp);
+ DEBUG_ARG("offer = %d", offer);
+
+ mss = min(if_mtu, if_mru) - sizeof(struct tcpiphdr);
+ 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((dfd, " returning mss = %d\n", mss));
+
+ return mss;
+}
diff --git a/slirp/tcp_output.c b/slirp/tcp_output.c
new file mode 100644
index 0000000..0f05dfa
--- /dev/null
+++ b/slirp/tcp_output.c
@@ -0,0 +1,608 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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.
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+#include <slirp.h>
+
+#define max(x,y) ((x) > (y) ? (x) : (y))
+#define min(x,y) ((x) < (y) ? (x) : (y))
+
+/*
+ * Since this is only used in "stats socket", we give meaning
+ * names instead of the REAL names
+ */
+char *tcpstates[] = {
+/* "CLOSED", "LISTEN", "SYN_SENT", "SYN_RCVD", */
+ "REDIRECT", "LISTEN", "SYN_SENT", "SYN_RCVD",
+ "ESTABLISHED", "CLOSE_WAIT", "FIN_WAIT_1", "CLOSING",
+ "LAST_ACK", "FIN_WAIT_2", "TIME_WAIT",
+};
+
+u_char 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,
+};
+
+
+#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(tp)
+ register 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;
+ u_char opt[MAX_TCPOPTLEN];
+ unsigned optlen, hdrlen;
+ int idle, sendalot;
+
+ DEBUG_CALL("tcp_output");
+ DEBUG_ARG("tp = %lx", (long )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((dfd, " --- tcp_output flags = 0x%x\n",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.
+ */
+ tcpstat.tcps_didnuttin++;
+
+ 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) {
+ u_int16_t mss;
+
+ opt[0] = TCPOPT_MAXSEG;
+ opt[1] = 4;
+ mss = htons((u_int16_t) tcp_mss(tp, 0));
+ memcpy((caddr_t)(opt + 2), (caddr_t)&mss, sizeof(mss));
+ optlen = 4;
+
+/* if ((tp->t_flags & TF_REQ_SCALE) &&
+ * ((flags & TH_ACK) == 0 ||
+ * (tp->t_flags & TF_RCVD_SCALE))) {
+ * *((u_int32_t *) (opt + optlen)) = htonl(
+ * TCPOPT_NOP << 24 |
+ * TCPOPT_WINDOW << 16 |
+ * TCPOLEN_WINDOW << 8 |
+ * tp->request_r_scale);
+ * optlen += 4;
+ * }
+ */
+ }
+ }
+
+ /*
+ * Send a timestamp and echo-reply if this is a SYN and our side
+ * wants to use timestamps (TF_REQ_TSTMP is set) or both our side
+ * and our peer have sent timestamps in our SYN's.
+ */
+/* if ((tp->t_flags & (TF_REQ_TSTMP|TF_NOOPT)) == TF_REQ_TSTMP &&
+ * (flags & TH_RST) == 0 &&
+ * ((flags & (TH_SYN|TH_ACK)) == TH_SYN ||
+ * (tp->t_flags & TF_RCVD_TSTMP))) {
+ * u_int32_t *lp = (u_int32_t *)(opt + optlen);
+ *
+ * / * Form timestamp option as shown in appendix A of RFC 1323. * /
+ * *lp++ = htonl(TCPOPT_TSTAMP_HDR);
+ * *lp++ = htonl(tcp_now);
+ * *lp = htonl(tp->ts_recent);
+ * optlen += TCPOLEN_TSTAMP_APPA;
+ * }
+ */
+ 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) {
+ if (tp->t_force && len == 1)
+ tcpstat.tcps_sndprobe++;
+ else if (SEQ_LT(tp->snd_nxt, tp->snd_max)) {
+ tcpstat.tcps_sndrexmitpack++;
+ tcpstat.tcps_sndrexmitbyte += len;
+ } else {
+ tcpstat.tcps_sndpack++;
+ tcpstat.tcps_sndbyte += len;
+ }
+
+ m = m_get();
+ if (m == NULL) {
+/* error = ENOBUFS; */
+ error = 1;
+ goto out;
+ }
+ m->m_data += if_maxlinkhdr;
+ m->m_len = hdrlen;
+
+ /*
+ * This will always succeed, since we make sure our mbufs
+ * are big enough to hold one MSS packet + header + ... etc.
+ */
+/* if (len <= MHLEN - hdrlen - max_linkhdr) { */
+
+ sbcopy(&so->so_snd, off, (int) len, mtod(m, caddr_t) + hdrlen);
+ m->m_len += len;
+
+/* } else {
+ * m->m_next = m_copy(so->so_snd.sb_mb, off, (int) len);
+ * if (m->m_next == 0)
+ * len = 0;
+ * }
+ */
+ /*
+ * 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 {
+ if (tp->t_flags & TF_ACKNOW)
+ tcpstat.tcps_sndacks++;
+ else if (flags & (TH_SYN|TH_FIN|TH_RST))
+ tcpstat.tcps_sndctrl++;
+ else if (SEQ_GT(tp->snd_up, tp->snd_una))
+ tcpstat.tcps_sndurg++;
+ else
+ tcpstat.tcps_sndwinup++;
+
+ m = m_get();
+ if (m == NULL) {
+/* error = ENOBUFS; */
+ error = 1;
+ goto out;
+ }
+ m->m_data += if_maxlinkhdr;
+ m->m_len = hdrlen;
+ }
+
+ ti = mtod(m, struct tcpiphdr *);
+
+ memcpy((caddr_t)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((caddr_t)(ti + 1), (caddr_t)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((u_int16_t) (win>>tp->rcv_scale));
+
+ if (SEQ_GT(tp->snd_up, tp->snd_una)) {
+ ti->ti_urp = htons((u_int16_t)(tp->snd_up - ntohl(ti->ti_seq)));
+#ifdef notdef
+ if (SEQ_GT(tp->snd_up, tp->snd_nxt)) {
+ ti->ti_urp = htons((u_int16_t)(tp->snd_up - tp->snd_nxt));
+#endif
+ 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((u_int16_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;
+ tcpstat.tcps_segstimed++;
+ }
+ }
+
+ /*
+ * 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 */
+
+ {
+
+ ((struct ip *)ti)->ip_len = m->m_len;
+
+ ((struct ip *)ti)->ip_ttl = ip_defttl;
+ ((struct ip *)ti)->ip_tos = so->so_iptos;
+
+/* #if BSD >= 43 */
+ /* Don't do IP options... */
+/* error = ip_output(m, tp->t_inpcb->inp_options, &tp->t_inpcb->inp_route,
+ * so->so_options & SO_DONTROUTE, 0);
+ */
+ error = ip_output(so, m);
+
+/* #else
+ * error = ip_output(m, (struct mbuf *)0, &tp->t_inpcb->inp_route,
+ * so->so_options & SO_DONTROUTE);
+ * #endif
+ */
+ }
+ if (error) {
+out:
+/* if (error == ENOBUFS) {
+ * tcp_quench(tp->t_inpcb, 0);
+ * return (0);
+ * }
+ */
+/* if ((error == EHOSTUNREACH || error == ENETDOWN)
+ * && TCPS_HAVERCVDSYN(tp->t_state)) {
+ * tp->t_softerror = error;
+ * return (0);
+ * }
+ */
+ return (error);
+ }
+ tcpstat.tcps_sndtotal++;
+
+ /*
+ * 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(tp)
+ register struct tcpcb *tp;
+{
+ int t = ((tp->t_srtt >> 2) + tp->t_rttvar) >> 1;
+
+/* if (tp->t_timer[TCPT_REXMT])
+ * panic("tcp_output REXMT");
+ */
+ /*
+ * 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/tcp_subr.c b/slirp/tcp_subr.c
new file mode 100644
index 0000000..bf8a202
--- /dev/null
+++ b/slirp/tcp_subr.c
@@ -0,0 +1,1325 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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.
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+#define WANT_SYS_IOCTL_H
+#include <slirp.h>
+
+/* patchable/settable parameters for tcp */
+int tcp_mssdflt = TCP_MSS;
+int tcp_rttdflt = TCPTV_SRTTDFLT / PR_SLOWHZ;
+int tcp_do_rfc1323 = 0; /* Don't do rfc1323 performance enhancements */
+int tcp_rcvspace; /* You may want to change this */
+int tcp_sndspace; /* Keep small if you have an error prone link */
+
+/*
+ * Tcp initialization
+ */
+void
+tcp_init()
+{
+ tcp_iss = 1; /* wrong */
+ tcb.so_next = tcb.so_prev = &tcb;
+
+ /* tcp_rcvspace = our Window we advertise to the remote */
+ tcp_rcvspace = TCP_RCVSPACE;
+ tcp_sndspace = TCP_SNDSPACE;
+
+ /* Make sure tcp_sndspace is at least 2*MSS */
+ if (tcp_sndspace < 2*(min(if_mtu, if_mru) - sizeof(struct tcpiphdr)))
+ tcp_sndspace = 2*(min(if_mtu, if_mru) - sizeof(struct tcpiphdr));
+}
+
+/*
+ * 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.
+ */
+/* struct tcpiphdr * */
+void
+tcp_template(tp)
+ struct tcpcb *tp;
+{
+ struct socket *so = tp->t_socket;
+ register struct tcpiphdr *n = &tp->t_template;
+
+ n->ti_next = n->ti_prev = 0;
+ n->ti_x1 = 0;
+ n->ti_pr = IPPROTO_TCP;
+ n->ti_len = htons(sizeof (struct tcpiphdr) - sizeof (struct ip));
+ n->ti_src = so->so_faddr;
+ n->ti_dst = so->so_laddr;
+ n->ti_sport = so->so_fport;
+ n->ti_dport = so->so_lport;
+
+ 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(tp, ti, m, ack, seq, flags)
+ struct tcpcb *tp;
+ register struct tcpiphdr *ti;
+ register struct mbuf *m;
+ tcp_seq ack, seq;
+ int flags;
+{
+ register int tlen;
+ int win = 0;
+
+ DEBUG_CALL("tcp_respond");
+ DEBUG_ARG("tp = %lx", (long)tp);
+ DEBUG_ARG("ti = %lx", (long)ti);
+ DEBUG_ARG("m = %lx", (long)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 == 0) {
+ if ((m = m_get()) == NULL)
+ return;
+#ifdef TCP_COMPAT_42
+ tlen = 1;
+#else
+ tlen = 0;
+#endif
+ m->m_data += if_maxlinkhdr;
+ *mtod(m, struct tcpiphdr *) = *ti;
+ ti = mtod(m, struct tcpiphdr *);
+ flags = TH_ACK;
+ } else {
+ /*
+ * ti points into m so the next line is just making
+ * the mbuf point to ti
+ */
+ m->m_data = (caddr_t)ti;
+
+ m->m_len = sizeof (struct tcpiphdr);
+ tlen = 0;
+#define xchg(a,b,type) { type t; t=a; a=b; b=t; }
+ xchg(ti->ti_dst.s_addr, ti->ti_src.s_addr, u_int32_t);
+ xchg(ti->ti_dport, ti->ti_sport, u_int16_t);
+#undef xchg
+ }
+ ti->ti_len = htons((u_short)(sizeof (struct tcphdr) + tlen));
+ tlen += sizeof (struct tcpiphdr);
+ m->m_len = tlen;
+
+ ti->ti_next = ti->ti_prev = 0;
+ ti->ti_x1 = 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((u_int16_t) (win >> tp->rcv_scale));
+ else
+ ti->ti_win = htons((u_int16_t)win);
+ ti->ti_urp = 0;
+ ti->ti_sum = 0;
+ ti->ti_sum = cksum(m, tlen);
+ ((struct ip *)ti)->ip_len = tlen;
+
+ if(flags & TH_RST)
+ ((struct ip *)ti)->ip_ttl = MAXTTL;
+ else
+ ((struct ip *)ti)->ip_ttl = ip_defttl;
+
+ (void) ip_output((struct socket *)0, m);
+}
+
+/*
+ * Create a new TCP control block, making an
+ * empty reassembly queue and hooking it to the argument
+ * protocol control block.
+ */
+struct tcpcb *
+tcp_newtcpcb(so)
+ 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 = (tcpiphdrp_32)tp;
+ tp->t_maxseg = tcp_mssdflt;
+
+ 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 = tcp_rttdflt * PR_SLOWHZ << 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 errno)
+{
+/* tcp_drop(tp, errno)
+ register struct tcpcb *tp;
+ int errno;
+{
+*/
+
+ DEBUG_CALL("tcp_drop");
+ DEBUG_ARG("tp = %lx", (long)tp);
+ DEBUG_ARG("errno = %d", errno);
+
+ if (TCPS_HAVERCVDSYN(tp->t_state)) {
+ tp->t_state = TCPS_CLOSED;
+ (void) tcp_output(tp);
+ tcpstat.tcps_drops++;
+ } else
+ tcpstat.tcps_conndrops++;
+/* if (errno == ETIMEDOUT && tp->t_softerror)
+ * errno = tp->t_softerror;
+ */
+/* so->so_error = errno; */
+ 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(tp)
+ register struct tcpcb *tp;
+{
+ register struct tcpiphdr *t;
+ struct socket *so = tp->t_socket;
+ register struct mbuf *m;
+
+ DEBUG_CALL("tcp_close");
+ DEBUG_ARG("tp = %lx", (long )tp);
+
+ /* free the reassembly queue, if any */
+ t = (struct tcpiphdr *) tp->seg_next;
+ while (t != (struct tcpiphdr *)tp) {
+ t = (struct tcpiphdr *)t->ti_next;
+ m = (struct mbuf *) REASS_MBUF((struct tcpiphdr *)t->ti_prev);
+ remque_32((struct tcpiphdr *) t->ti_prev);
+ m_freem(m);
+ }
+ /* It's static */
+/* if (tp->t_template)
+ * (void) m_free(dtom(tp->t_template));
+ */
+/* free(tp, M_PCB); */
+ free(tp);
+ so->so_tcpcb = 0;
+ soisfdisconnected(so);
+ /* clobber input socket cache if we're closing the cached connection */
+ if (so == tcp_last_so)
+ tcp_last_so = &tcb;
+ close(so->s);
+ sbfree(&so->so_rcv);
+ sbfree(&so->so_snd);
+ sofree(so);
+ tcpstat.tcps_closed++;
+ return ((struct tcpcb *)0);
+}
+
+void
+tcp_drain()
+{
+ /* XXX */
+}
+
+/*
+ * When a source quench is received, close congestion window
+ * to one segment. We will gradually open it again as we proceed.
+ */
+
+#ifdef notdef
+
+void
+tcp_quench(i, errno)
+
+ int errno;
+{
+ struct tcpcb *tp = intotcpcb(inp);
+
+ if (tp)
+ tp->snd_cwnd = tp->t_maxseg;
+}
+
+#endif /* notdef */
+
+/*
+ * 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(tp)
+ struct tcpcb *tp;
+{
+
+ DEBUG_CALL("tcp_sockclosed");
+ DEBUG_ARG("tp = %lx", (long)tp);
+
+ 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;
+ }
+/* soisfdisconnecting(tp->t_socket); */
+ if (tp && tp->t_state >= TCPS_FIN_WAIT_2)
+ soisfdisconnected(tp->t_socket);
+ if (tp)
+ 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(so)
+ struct socket *so;
+{
+ int ret=0;
+
+ DEBUG_CALL("tcp_fconnect");
+ DEBUG_ARG("so = %lx", (long )so);
+
+ if( (ret=so->s=socket(AF_INET,SOCK_STREAM,0)) >= 0) {
+ int opt, s=so->s;
+ struct sockaddr_in addr;
+
+ fd_nonblock(s);
+ opt = 1;
+ setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(opt ));
+ opt = 1;
+ setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(opt ));
+
+ addr.sin_family = AF_INET;
+ if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
+ /* It's an alias */
+ switch(ntohl(so->so_faddr.s_addr) & 0xff) {
+ case CTL_DNS:
+ addr.sin_addr = dns_addr;
+ break;
+ case CTL_ALIAS:
+ default:
+ addr.sin_addr = loopback_addr;
+ break;
+ }
+ } else
+ addr.sin_addr = so->so_faddr;
+ addr.sin_port = so->so_fport;
+
+ DEBUG_MISC((dfd, " connect()ing, addr.sin_port=%d, "
+ "addr.sin_addr.s_addr=%.16s\n",
+ ntohs(addr.sin_port), inet_ntoa(addr.sin_addr)));
+ /* We don't care what port we get */
+ ret = connect(s,(struct sockaddr *)&addr,sizeof (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(inso)
+ struct socket *inso;
+{
+ struct socket *so;
+ struct sockaddr_in addr;
+ int addrlen = sizeof(struct sockaddr_in);
+ struct tcpcb *tp;
+ int s, opt;
+
+ DEBUG_CALL("tcp_connect");
+ DEBUG_ARG("inso = %lx", (long)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 {
+ if ((so = socreate()) == NULL) {
+ /* If it failed, get rid of the pending connection */
+ close(accept(inso->s,(struct sockaddr *)&addr,&addrlen));
+ return;
+ }
+ if (tcp_attach(so) < 0) {
+ free(so); /* NOT sofree */
+ return;
+ }
+ so->so_laddr = inso->so_laddr;
+ so->so_lport = inso->so_lport;
+ }
+
+ (void) tcp_mss(sototcpcb(so), 0);
+
+ if ((s = accept(inso->s,(struct sockaddr *)&addr,&addrlen)) < 0) {
+ tcp_close(sototcpcb(so)); /* This will sofree() as well */
+ return;
+ }
+ fd_nonblock(s);
+ opt = 1;
+ setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
+ opt = 1;
+ setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
+
+ so->so_fport = addr.sin_port;
+ so->so_faddr = addr.sin_addr;
+ /* Translate connections from localhost to the real hostname */
+ if (so->so_faddr.s_addr == 0 || so->so_faddr.s_addr == loopback_addr.s_addr)
+ so->so_faddr = our_addr;
+
+ /* Close the accept() socket, set right state */
+ if (inso->so_state & SS_FACCEPTONCE) {
+ close(so->s); /* If we only accept once, close the accept() socket */
+ so->so_state = SS_NOFDREF; /* Don't select it yet, even though we have an FD */
+ /* if it's not FACCEPTONCE, it's already NOFDREF */
+ }
+ so->s = s;
+
+ so->so_iptos = tcp_tos(so);
+ tp = sototcpcb(so);
+
+ tcp_template(tp);
+
+ /* Compute window scaling to request. */
+/* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
+ * (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
+ * tp->request_r_scale++;
+ */
+
+/* soisconnecting(so); */ /* NOFDREF used instead */
+ tcpstat.tcps_connattempt++;
+
+ tp->t_state = TCPS_SYN_SENT;
+ tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
+ tp->iss = tcp_iss;
+ tcp_iss += TCP_ISSINCR/2;
+ tcp_sendseqinit(tp);
+ tcp_output(tp);
+}
+
+/*
+ * Attach a TCPCB to a socket.
+ */
+int
+tcp_attach(so)
+ struct socket *so;
+{
+ if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL)
+ return -1;
+
+ insque(so, &tcb);
+
+ return 0;
+}
+
+/*
+ * Set the socket's type of service field
+ */
+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, 514, IPTOS_LOWDELAY, EMU_RSH|EMU_NOCONNECT}, /* shell */
+ {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}
+};
+
+struct emu_t *tcpemu = 0;
+
+/*
+ * Return TOS according to the above table
+ */
+u_int8_t
+tcp_tos(so)
+ 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;
+}
+
+int do_echo = -1;
+
+/*
+ * 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(so, m)
+ struct socket *so;
+ struct mbuf *m;
+{
+ u_int n1, n2, n3, n4, n5, n6;
+ char buff[256];
+ u_int32_t laddr;
+ u_int lport;
+ char *bptr;
+
+ DEBUG_CALL("tcp_emu");
+ DEBUG_ARG("so = %lx", (long)so);
+ DEBUG_ARG("m = %lx", (long)m);
+
+ switch(so->so_emu) {
+ int x, i;
+
+ case EMU_IDENT:
+ /*
+ * Identification protocol as per rfc-1413
+ */
+
+ {
+ struct socket *tmpso;
+ struct sockaddr_in addr;
+ int addrlen = sizeof(struct sockaddr_in);
+ struct sbuf *so_rcv = &so->so_rcv;
+
+ 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, "%d%*[ ,]%d", &n1, &n2) == 2) {
+ HTONS(n1);
+ HTONS(n2);
+ /* n2 is the one on our host */
+ for (tmpso = tcb.so_next; tmpso != &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 = ntohs(addr.sin_port);
+ break;
+ }
+ }
+ }
+ so_rcv->sb_cc = sprintf(so_rcv->sb_data, "%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;
+ }
+
+#if 0
+ case EMU_RLOGIN:
+ /*
+ * Rlogin emulation
+ * First we accumulate all the initial option negotiation,
+ * then fork_exec() rlogin according to the options
+ */
+ {
+ int i, i2, n;
+ char *ptr;
+ char args[100];
+ char term[100];
+ struct sbuf *so_snd = &so->so_snd;
+ struct sbuf *so_rcv = &so->so_rcv;
+
+ /* First check if they have a priveladged port, or too much data has arrived */
+ if (ntohs(so->so_lport) > 1023 || ntohs(so->so_lport) < 512 ||
+ (m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
+ memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
+ so_snd->sb_wptr += 18;
+ so_snd->sb_cc += 18;
+ tcp_sockclosed(sototcpcb(so));
+ m_free(m);
+ return 0;
+ }
+
+ /* Append the current data */
+ 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_free(m);
+
+ /*
+ * Check if we have all the initial options,
+ * and build argument list to rlogin while we're here
+ */
+ n = 0;
+ ptr = so_rcv->sb_data;
+ args[0] = 0;
+ term[0] = 0;
+ while (ptr < so_rcv->sb_wptr) {
+ if (*ptr++ == 0) {
+ n++;
+ if (n == 2) {
+ sprintf(args, "rlogin -l %s %s",
+ ptr, inet_ntoa(so->so_faddr));
+ } else if (n == 3) {
+ i2 = so_rcv->sb_wptr - ptr;
+ for (i = 0; i < i2; i++) {
+ if (ptr[i] == '/') {
+ ptr[i] = 0;
+#ifdef HAVE_SETENV
+ sprintf(term, "%s", ptr);
+#else
+ sprintf(term, "TERM=%s", ptr);
+#endif
+ ptr[i] = '/';
+ break;
+ }
+ }
+ }
+ }
+ }
+
+ if (n != 4)
+ return 0;
+
+ /* We have it, set our term variable and fork_exec() */
+#ifdef HAVE_SETENV
+ setenv("TERM", term, 1);
+#else
+ putenv(term);
+#endif
+ fork_exec(so, args, 2);
+ term[0] = 0;
+ so->so_emu = 0;
+
+ /* And finally, send the client a 0 character */
+ so_snd->sb_wptr[0] = 0;
+ so_snd->sb_wptr++;
+ so_snd->sb_cc++;
+
+ return 0;
+ }
+
+ case EMU_RSH:
+ /*
+ * rsh emulation
+ * First we accumulate all the initial option negotiation,
+ * then rsh_exec() rsh according to the options
+ */
+ {
+ int n;
+ char *ptr;
+ char *user;
+ char *args;
+ struct sbuf *so_snd = &so->so_snd;
+ struct sbuf *so_rcv = &so->so_rcv;
+
+ /* First check if they have a priveladged port, or too much data has arrived */
+ if (ntohs(so->so_lport) > 1023 || ntohs(so->so_lport) < 512 ||
+ (m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
+ memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
+ so_snd->sb_wptr += 18;
+ so_snd->sb_cc += 18;
+ tcp_sockclosed(sototcpcb(so));
+ m_free(m);
+ return 0;
+ }
+
+ /* Append the current data */
+ 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_free(m);
+
+ /*
+ * Check if we have all the initial options,
+ * and build argument list to rlogin while we're here
+ */
+ n = 0;
+ ptr = so_rcv->sb_data;
+ user="";
+ args="";
+ if (so->extra==NULL) {
+ struct socket *ns;
+ struct tcpcb* tp;
+ int port=atoi(ptr);
+ if (port <= 0) return 0;
+ if (port > 1023 || port < 512) {
+ memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
+ so_snd->sb_wptr += 18;
+ so_snd->sb_cc += 18;
+ tcp_sockclosed(sototcpcb(so));
+ return 0;
+ }
+ if ((ns=socreate()) == NULL)
+ return 0;
+ if (tcp_attach(ns)<0) {
+ free(ns);
+ return 0;
+ }
+
+ ns->so_laddr=so->so_laddr;
+ ns->so_lport=htons(port);
+
+ (void) tcp_mss(sototcpcb(ns), 0);
+
+ ns->so_faddr=so->so_faddr;
+ ns->so_fport=htons(IPPORT_RESERVED-1); /* Use a fake port. */
+
+ if (ns->so_faddr.s_addr == 0 ||
+ ns->so_faddr.s_addr == loopback_addr.s_addr)
+ ns->so_faddr = our_addr;
+
+ ns->so_iptos = tcp_tos(ns);
+ tp = sototcpcb(ns);
+
+ tcp_template(tp);
+
+ /* Compute window scaling to request. */
+ /* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
+ * (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
+ * tp->request_r_scale++;
+ */
+
+ /*soisfconnecting(ns);*/
+
+ tcpstat.tcps_connattempt++;
+
+ tp->t_state = TCPS_SYN_SENT;
+ tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
+ tp->iss = tcp_iss;
+ tcp_iss += TCP_ISSINCR/2;
+ tcp_sendseqinit(tp);
+ tcp_output(tp);
+ so->extra=ns;
+ }
+ while (ptr < so_rcv->sb_wptr) {
+ if (*ptr++ == 0) {
+ n++;
+ if (n == 2) {
+ user=ptr;
+ } else if (n == 3) {
+ args=ptr;
+ }
+ }
+ }
+
+ if (n != 4)
+ return 0;
+
+ rsh_exec(so,so->extra, user, inet_ntoa(so->so_faddr), args);
+ so->so_emu = 0;
+ so->extra=NULL;
+
+ /* And finally, send the client a 0 character */
+ so_snd->sb_wptr[0] = 0;
+ so_snd->sb_wptr++;
+ so_snd->sb_cc++;
+
+ return 0;
+ }
+
+ case EMU_CTL:
+ {
+ int num;
+ struct sbuf *so_snd = &so->so_snd;
+ struct sbuf *so_rcv = &so->so_rcv;
+
+ /*
+ * If there is binary data here, we save it in so->so_m
+ */
+ if (!so->so_m) {
+ int rxlen;
+ char *rxdata;
+ rxdata=mtod(m, char *);
+ for (rxlen=m->m_len; rxlen; rxlen--) {
+ if (*rxdata++ & 0x80) {
+ so->so_m = m;
+ return 0;
+ }
+ }
+ } /* if(so->so_m==NULL) */
+
+ /*
+ * Append the line
+ */
+ sbappendsb(so_rcv, m);
+
+ /* To avoid going over the edge of the buffer, we reset it */
+ if (so_snd->sb_cc == 0)
+ so_snd->sb_wptr = so_snd->sb_rptr = so_snd->sb_data;
+
+ /*
+ * A bit of a hack:
+ * If the first packet we get here is 1 byte long, then it
+ * was done in telnet character mode, therefore we must echo
+ * the characters as they come. Otherwise, we echo nothing,
+ * because in linemode, the line is already echoed
+ * XXX two or more control connections won't work
+ */
+ if (do_echo == -1) {
+ if (m->m_len == 1) do_echo = 1;
+ else do_echo = 0;
+ }
+ if (do_echo) {
+ sbappendsb(so_snd, m);
+ m_free(m);
+ tcp_output(sototcpcb(so)); /* XXX */
+ } else
+ m_free(m);
+
+ num = 0;
+ while (num < so->so_rcv.sb_cc) {
+ if (*(so->so_rcv.sb_rptr + num) == '\n' ||
+ *(so->so_rcv.sb_rptr + num) == '\r') {
+ int n;
+
+ *(so_rcv->sb_rptr + num) = 0;
+ if (ctl_password && !ctl_password_ok) {
+ /* Need a password */
+ if (sscanf(so_rcv->sb_rptr, "pass %256s", buff) == 1) {
+ if (strcmp(buff, ctl_password) == 0) {
+ ctl_password_ok = 1;
+ n = sprintf(so_snd->sb_wptr,
+ "Password OK.\r\n");
+ goto do_prompt;
+ }
+ }
+ n = sprintf(so_snd->sb_wptr,
+ "Error: Password required, log on with \"pass PASSWORD\"\r\n");
+ goto do_prompt;
+ }
+ cfg_quitting = 0;
+ n = do_config(so_rcv->sb_rptr, so, PRN_SPRINTF);
+ if (!cfg_quitting) {
+ /* Register the printed data */
+do_prompt:
+ so_snd->sb_cc += n;
+ so_snd->sb_wptr += n;
+ /* Add prompt */
+ n = sprintf(so_snd->sb_wptr, "Slirp> ");
+ so_snd->sb_cc += n;
+ so_snd->sb_wptr += n;
+ }
+ /* Drop so_rcv data */
+ so_rcv->sb_cc = 0;
+ so_rcv->sb_wptr = so_rcv->sb_rptr = so_rcv->sb_data;
+ tcp_output(sototcpcb(so)); /* Send the reply */
+ }
+ num++;
+ }
+ return 0;
+ }
+#endif
+ case EMU_FTP: /* ftp */
+ *(m->m_data+m->m_len) = 0; /* NULL terminate for strstr */
+ if ((bptr = (char *)strstr(m->m_data, "ORT")) != NULL) {
+ /*
+ * Need to emulate the PORT command
+ */
+ x = sscanf(bptr, "ORT %d,%d,%d,%d,%d,%d\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 = solisten(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 += sprintf(bptr,"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 (%d,%d,%d,%d,%d,%d)\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 = solisten(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 += sprintf(bptr,"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 = solisten(0, so->so_laddr.s_addr, htons(lport), SS_FACCEPTONCE)) != NULL)
+ m->m_len = sprintf(m->m_data, "%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 = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
+ return 1;
+
+ m->m_len = bptr - m->m_data; /* Adjust length */
+ m->m_len += sprintf(bptr, "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 = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
+ return 1;
+
+ m->m_len = bptr - m->m_data; /* Adjust length */
+ m->m_len += sprintf(bptr, "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 = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
+ return 1;
+
+ m->m_len = bptr - m->m_data; /* Adjust length */
+ m->m_len += sprintf(bptr, "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 .....×..gælÜc..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...........Á.
+ * 0010:00 67 75 78 F5 63 00 0A 57 69 6E 32 2E 30 2E 30 .guxõc..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) {
+ u_short 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 = (((u_char*)bptr)[0] << 8)
+ + ((u_char *)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( htons(p),
+ so->so_laddr.s_addr,
+ htons(lport),
+ SS_FACCEPTONCE)) {
+ break;
+ }
+ }
+ if (p == 7071)
+ p = 0;
+ *(u_char *)bptr++ = (p >> 8) & 0xff;
+ *(u_char *)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(so)
+ struct socket *so;
+{
+#if 0
+ struct sbuf *sb = &so->so_snd;
+ int command;
+ struct ex_list *ex_ptr;
+ int do_pty;
+ struct socket *tmpso;
+
+ DEBUG_CALL("tcp_ctl");
+ DEBUG_ARG("so = %lx", (long )so);
+
+ /*
+ * Check if they're authorised
+ */
+ if (ctl_addr.s_addr && (ctl_addr.s_addr == -1 || (so->so_laddr.s_addr != ctl_addr.s_addr))) {
+ sb->sb_cc = sprintf(sb->sb_wptr,"Error: Permission denied.\r\n");
+ sb->sb_wptr += sb->sb_cc;
+ return 0;
+ }
+
+ command = (ntohl(so->so_faddr.s_addr) & 0xff);
+
+ switch(command) {
+ default: /* Check for exec's */
+
+ /*
+ * Check if it's pty_exec
+ */
+ for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
+ if (ex_ptr->ex_fport == so->so_fport &&
+ command == ex_ptr->ex_addr) {
+ do_pty = ex_ptr->ex_pty;
+ goto do_exec;
+ }
+ }
+
+ /*
+ * Nothing bound..
+ */
+ /* tcp_fconnect(so); */
+
+ /* FALLTHROUGH */
+ case CTL_ALIAS:
+ sb->sb_cc = sprintf(sb->sb_wptr,
+ "Error: No application configured.\r\n");
+ sb->sb_wptr += sb->sb_cc;
+ return(0);
+
+ do_exec:
+ DEBUG_MISC((dfd, " executing %s \n",ex_ptr->ex_exec));
+ return(fork_exec(so, ex_ptr->ex_exec, do_pty));
+
+ case CTL_CMD:
+ for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
+ if (tmpso->so_emu == EMU_CTL &&
+ !(tmpso->so_tcpcb?
+ (tmpso->so_tcpcb->t_state & (TCPS_TIME_WAIT|TCPS_LAST_ACK))
+ :0)) {
+ /* Ooops, control connection already active */
+ sb->sb_cc = sprintf(sb->sb_wptr,"Sorry, already connected.\r\n");
+ sb->sb_wptr += sb->sb_cc;
+ return 0;
+ }
+ }
+ so->so_emu = EMU_CTL;
+ ctl_password_ok = 0;
+ sb->sb_cc = sprintf(sb->sb_wptr, "Slirp command-line ready (type \"help\" for help).\r\nSlirp> ");
+ sb->sb_wptr += sb->sb_cc;
+ do_echo=-1;
+ return(2);
+ }
+#else
+ return 0;
+#endif
+}
diff --git a/slirp/tcp_timer.c b/slirp/tcp_timer.c
new file mode 100644
index 0000000..166979a
--- /dev/null
+++ b/slirp/tcp_timer.c
@@ -0,0 +1,329 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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>
+
+#define max(x,y) ((x) > (y) ? (x) : (y))
+#define min(x,y) ((x) < (y) ? (x) : (y))
+
+int tcp_keepidle = TCPTV_KEEP_IDLE;
+int tcp_keepintvl = TCPTV_KEEPINTVL;
+int tcp_maxidle;
+int so_options = DO_KEEPALIVE;
+
+struct tcpstat tcpstat; /* tcp statistics */
+u_int32_t tcp_now; /* for RFC 1323 timestamps */
+
+/*
+ * Fast timeout routine for processing delayed acks
+ */
+void
+tcp_fasttimo()
+{
+ register struct socket *so;
+ register struct tcpcb *tp;
+
+ DEBUG_CALL("tcp_fasttimo");
+
+ so = tcb.so_next;
+ if (so)
+ for (; so != &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;
+ tcpstat.tcps_delack++;
+ (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()
+{
+ register struct socket *ip, *ipnxt;
+ register struct tcpcb *tp;
+ register int i;
+
+ DEBUG_CALL("tcp_slowtimo");
+
+ tcp_maxidle = TCPTV_KEEPCNT * tcp_keepintvl;
+ /*
+ * Search through tcb's and update active timers.
+ */
+ ip = tcb.so_next;
+ if (ip == 0)
+ return;
+ for (; ip != &tcb; ip = ipnxt) {
+ ipnxt = ip->so_next;
+ tp = sototcpcb(ip);
+ if (tp == 0)
+ 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:
+ ;
+ }
+ tcp_iss += TCP_ISSINCR/PR_SLOWHZ; /* increment iss */
+#ifdef TCP_COMPAT_42
+ if ((int)tcp_iss < 0)
+ tcp_iss = 0; /* XXX */
+#endif
+ tcp_now++; /* for timestamps */
+}
+
+/*
+ * Cancel all timers for TCP tp.
+ */
+void
+tcp_canceltimers(tp)
+ struct tcpcb *tp;
+{
+ register int i;
+
+ for (i = 0; i < TCPT_NTIMERS; i++)
+ tp->t_timer[i] = 0;
+}
+
+int tcp_backoff[TCP_MAXRXTSHIFT + 1] =
+ { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
+
+/*
+ * TCP timer processing.
+ */
+struct tcpcb *
+tcp_timers(tp, timer)
+ 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] = tcp_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;
+ tcpstat.tcps_timeoutdrop++;
+ 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;
+ }
+ tcpstat.tcps_rexmttimeo++;
+ 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) {
+/* in_losing(tp->t_inpcb); */
+ 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.)
+ */
+ {
+ u_int 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:
+ tcpstat.tcps_persisttimeo++;
+ 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:
+ tcpstat.tcps_keeptimeo++;
+ if (tp->t_state < TCPS_ESTABLISHED)
+ goto dropit;
+
+/* if (tp->t_socket->so_options & SO_KEEPALIVE && */
+ if ((so_options) && tp->t_state <= TCPS_CLOSE_WAIT) {
+ if (tp->t_idle >= tcp_keepidle + 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.
+ */
+ tcpstat.tcps_keepprobe++;
+#ifdef TCP_COMPAT_42
+ /*
+ * The keepalive packet must have nonzero length
+ * to get a 4.2 host to respond.
+ */
+ tcp_respond(tp, &tp->t_template, (struct mbuf *)NULL,
+ tp->rcv_nxt - 1, tp->snd_una - 1, 0);
+#else
+ tcp_respond(tp, &tp->t_template, (struct mbuf *)NULL,
+ tp->rcv_nxt, tp->snd_una - 1, 0);
+#endif
+ tp->t_timer[TCPT_KEEP] = tcp_keepintvl;
+ } else
+ tp->t_timer[TCPT_KEEP] = tcp_keepidle;
+ break;
+
+ dropit:
+ tcpstat.tcps_keepdrops++;
+ tp = tcp_drop(tp, 0); /* ETIMEDOUT); */
+ break;
+ }
+
+ return (tp);
+}
diff --git a/slirp/tcp_timer.h b/slirp/tcp_timer.h
new file mode 100644
index 0000000..59933bc
--- /dev/null
+++ b/slirp/tcp_timer.h
@@ -0,0 +1,142 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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 ( 64*PR_SLOWHZ) */ /* max allowable REXMT 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 */
+
+
+#ifdef TCPTIMERS
+char *tcptimers[] =
+ { "REXMT", "PERSIST", "KEEP", "2MSL" };
+#endif
+
+/*
+ * 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 int tcp_keepidle; /* time before keepalive probes begin */
+extern int tcp_keepintvl; /* time between keepalive probes */
+extern int tcp_maxidle; /* time to drop after starting probes */
+extern int tcp_ttl; /* time to live for TCP segs */
+extern int tcp_backoff[];
+
+struct tcpcb;
+
+void tcp_fasttimo _P((void));
+void tcp_slowtimo _P((void));
+void tcp_canceltimers _P((struct tcpcb *));
+struct tcpcb * tcp_timers _P((register struct tcpcb *, int));
+
+#endif
diff --git a/slirp/tcp_var.h b/slirp/tcp_var.h
new file mode 100644
index 0000000..0d6cd24
--- /dev/null
+++ b/slirp/tcp_var.h
@@ -0,0 +1,252 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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"
+
+#if SIZEOF_CHAR_P == 4
+ typedef struct tcpiphdr *tcpiphdrp_32;
+#else
+ typedef u_int32_t tcpiphdrp_32;
+#endif
+
+/*
+ * Tcp control block, one per tcp; fields:
+ */
+struct tcpcb {
+ tcpiphdrp_32 seg_next; /* sequencing queue */
+ tcpiphdrp_32 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 */
+ u_short t_maxseg; /* maximum segment size */
+ char t_force; /* 1 if forcing out a byte */
+ u_short 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 */
+
+ /* Make it static for now */
+/* struct tcpiphdr *t_template; / * skeletal packet for transmit */
+ struct tcpiphdr t_template;
+
+ 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 */
+ u_int32_t snd_wnd; /* send window */
+/* receive sequence variables */
+ u_int32_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) */
+ u_int32_t snd_cwnd; /* congestion-controlled window */
+ u_int32_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 */
+ u_short t_rttmin; /* minimum rtt allowed */
+ u_int32_t max_sndwnd; /* largest window peer has offered */
+
+/* out-of-band data */
+ char t_oobflags; /* have some */
+ char t_iobc; /* input character */
+#define TCPOOB_HAVEDATA 0x01
+#define TCPOOB_HADDATA 0x02
+ short t_softerror; /* possible error not yet reported */
+
+/* RFC 1323 variables */
+ u_char snd_scale; /* window scaling for send window */
+ u_char rcv_scale; /* window scaling for recv window */
+ u_char request_r_scale; /* pending window scaling */
+ u_char requested_s_scale;
+ u_int32_t ts_recent; /* timestamp echo data */
+ u_int32_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)
+
+/* XXX
+ * We want to avoid doing m_pullup on incoming packets but that
+ * means avoiding dtom on the tcp reassembly code. That in turn means
+ * keeping an mbuf pointer in the reassembly queue (since we might
+ * have a cluster). As a quick hack, the source & destination
+ * port numbers (which are no longer needed once we've located the
+ * tcpcb) are overlayed with an mbuf pointer.
+ */
+#if SIZEOF_CHAR_P == 4
+typedef struct mbuf *mbufp_32;
+#else
+typedef u_int32_t mbufp_32;
+#endif
+#define REASS_MBUF(ti) (*(mbufp_32 *)&((ti)->ti_t))
+
+/*
+ * TCP statistics.
+ * Many of these should be kept per connection,
+ * but that's inconvenient at the moment.
+ */
+struct tcpstat {
+ u_long tcps_connattempt; /* connections initiated */
+ u_long tcps_accepts; /* connections accepted */
+ u_long tcps_connects; /* connections established */
+ u_long tcps_drops; /* connections dropped */
+ u_long tcps_conndrops; /* embryonic connections dropped */
+ u_long tcps_closed; /* conn. closed (includes drops) */
+ u_long tcps_segstimed; /* segs where we tried to get rtt */
+ u_long tcps_rttupdated; /* times we succeeded */
+ u_long tcps_delack; /* delayed acks sent */
+ u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
+ u_long tcps_rexmttimeo; /* retransmit timeouts */
+ u_long tcps_persisttimeo; /* persist timeouts */
+ u_long tcps_keeptimeo; /* keepalive timeouts */
+ u_long tcps_keepprobe; /* keepalive probes sent */
+ u_long tcps_keepdrops; /* connections dropped in keepalive */
+
+ u_long tcps_sndtotal; /* total packets sent */
+ u_long tcps_sndpack; /* data packets sent */
+ u_long tcps_sndbyte; /* data bytes sent */
+ u_long tcps_sndrexmitpack; /* data packets retransmitted */
+ u_long tcps_sndrexmitbyte; /* data bytes retransmitted */
+ u_long tcps_sndacks; /* ack-only packets sent */
+ u_long tcps_sndprobe; /* window probes sent */
+ u_long tcps_sndurg; /* packets sent with URG only */
+ u_long tcps_sndwinup; /* window update-only packets sent */
+ u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
+
+ u_long tcps_rcvtotal; /* total packets received */
+ u_long tcps_rcvpack; /* packets received in sequence */
+ u_long tcps_rcvbyte; /* bytes received in sequence */
+ u_long tcps_rcvbadsum; /* packets received with ccksum errs */
+ u_long tcps_rcvbadoff; /* packets received with bad offset */
+/* u_long tcps_rcvshort; */ /* packets received too short */
+ u_long tcps_rcvduppack; /* duplicate-only packets received */
+ u_long tcps_rcvdupbyte; /* duplicate-only bytes received */
+ u_long tcps_rcvpartduppack; /* packets with some duplicate data */
+ u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
+ u_long tcps_rcvoopack; /* out-of-order packets received */
+ u_long tcps_rcvoobyte; /* out-of-order bytes received */
+ u_long tcps_rcvpackafterwin; /* packets with data after window */
+ u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */
+ u_long tcps_rcvafterclose; /* packets rcvd after "close" */
+ u_long tcps_rcvwinprobe; /* rcvd window probe packets */
+ u_long tcps_rcvdupack; /* rcvd duplicate acks */
+ u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */
+ u_long tcps_rcvackpack; /* rcvd ack packets */
+ u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */
+ u_long tcps_rcvwinupd; /* rcvd window update packets */
+/* u_long tcps_pawsdrop; */ /* segments dropped due to PAWS */
+ u_long tcps_predack; /* times hdr predict ok for acks */
+ u_long tcps_preddat; /* times hdr predict ok for data pkts */
+ u_long tcps_socachemiss; /* tcp_last_so misses */
+ u_long tcps_didnuttin; /* Times tcp_output didn't do anything XXX */
+};
+
+extern struct tcpstat tcpstat; /* tcp statistics */
+extern u_int32_t tcp_now; /* for RFC 1323 timestamps */
+
+#endif
diff --git a/slirp/tcpip.h b/slirp/tcpip.h
new file mode 100644
index 0000000..82708b0
--- /dev/null
+++ b/slirp/tcpip.h
@@ -0,0 +1,74 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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 ipovly ti_i; /* overlaid ip structure */
+ struct tcphdr ti_t; /* tcp header */
+};
+#define ti_next ti_i.ih_next
+#define ti_prev ti_i.ih_prev
+#define ti_x1 ti_i.ih_x1
+#define ti_pr ti_i.ih_pr
+#define ti_len ti_i.ih_len
+#define ti_src ti_i.ih_src
+#define ti_dst ti_i.ih_dst
+#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
+
+/*
+ * 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/udp.c b/slirp/udp.c
new file mode 100644
index 0000000..76a4fcc
--- /dev/null
+++ b/slirp/udp.c
@@ -0,0 +1,654 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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"
+
+struct udpstat udpstat;
+
+struct socket udb;
+
+/*
+ * UDP protocol implementation.
+ * Per RFC 768, August, 1980.
+ */
+#ifndef COMPAT_42
+int udpcksum = 1;
+#else
+int udpcksum = 0; /* XXX */
+#endif
+
+struct socket *udp_last_so = &udb;
+
+void
+udp_init()
+{
+ udb.so_next = udb.so_prev = &udb;
+}
+/* m->m_data points at ip packet header
+ * m->m_len length ip packet
+ * ip->ip_len length data (IPDU)
+ */
+void
+udp_input(m, iphlen)
+ register struct mbuf *m;
+ int iphlen;
+{
+ register struct ip *ip;
+ register struct udphdr *uh;
+/* struct mbuf *opts = 0;*/
+ int len;
+ struct ip save_ip;
+ struct socket *so;
+
+ DEBUG_CALL("udp_input");
+ DEBUG_ARG("m = %lx", (long)m);
+ DEBUG_ARG("iphlen = %d", iphlen);
+
+ udpstat.udps_ipackets++;
+
+ /*
+ * 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 *)((caddr_t)ip + iphlen);
+
+ /*
+ * Make mbuf data length reflect UDP length.
+ * If not enough data to reflect UDP length, drop.
+ */
+ len = ntohs((u_int16_t)uh->uh_ulen);
+
+ if (ip->ip_len != len) {
+ if (len > ip->ip_len) {
+ udpstat.udps_badlen++;
+ 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 (udpcksum && uh->uh_sum) {
+ ((struct ipovly *)ip)->ih_next = 0;
+ ((struct ipovly *)ip)->ih_prev = 0;
+ ((struct ipovly *)ip)->ih_x1 = 0;
+ ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
+ /* keep uh_sum for ICMP reply
+ * uh->uh_sum = cksum(m, len + sizeof (struct ip));
+ * if (uh->uh_sum) {
+ */
+ if(cksum(m, len + sizeof(struct ip))) {
+ udpstat.udps_badsum++;
+ goto bad;
+ }
+ }
+
+ /*
+ * handle DHCP/BOOTP
+ */
+ if (ntohs(uh->uh_dport) == BOOTP_SERVER) {
+ bootp_input(m);
+ goto bad;
+ }
+
+ /*
+ * Locate pcb for datagram.
+ */
+ so = udp_last_so;
+ if (so->so_lport != uh->uh_sport ||
+ so->so_laddr.s_addr != ip->ip_src.s_addr) {
+ struct socket *tmp;
+
+ for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next) {
+ if (tmp->so_lport == uh->uh_sport &&
+ tmp->so_laddr.s_addr == ip->ip_src.s_addr) {
+ tmp->so_faddr.s_addr = ip->ip_dst.s_addr;
+ tmp->so_fport = uh->uh_dport;
+ so = tmp;
+ break;
+ }
+ }
+ if (tmp == &udb) {
+ so = NULL;
+ } else {
+ udpstat.udpps_pcbcachemiss++;
+ udp_last_so = so;
+ }
+ }
+
+ if (so == NULL) {
+ /*
+ * If there's no socket for this packet,
+ * create one
+ */
+ if ((so = socreate()) == NULL) goto bad;
+ if(udp_attach(so) == -1) {
+ DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
+ errno,strerror(errno)));
+ sofree(so);
+ goto bad;
+ }
+
+ /*
+ * Setup fields
+ */
+ /* udp_last_so = so; */
+ so->so_laddr = ip->ip_src;
+ so->so_lport = uh->uh_sport;
+ so->so_faddr = ip->ip_dst; /* XXX */
+ so->so_fport = uh->uh_dport; /* XXX */
+
+ 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.
+ */
+ }
+
+ iphlen += sizeof(struct udphdr);
+ m->m_len -= iphlen;
+ m->m_data += iphlen;
+
+ /*
+ * Now we sendto() the packet.
+ */
+ if (so->so_emu)
+ udp_emu(so, m);
+
+ if(sosendto(so,m) == -1) {
+ m->m_len += iphlen;
+ m->m_data -= iphlen;
+ *ip=save_ip;
+ DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno)));
+ icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
+ }
+
+ 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_freem(m);
+ /* if (opts) m_freem(opts); */
+ return;
+}
+
+int udp_output2(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 = %lx", (long)so);
+ DEBUG_ARG("m = %lx", (long)m);
+ DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
+ DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_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 *);
+ ui->ui_next = ui->ui_prev = 0;
+ ui->ui_x1 = 0;
+ ui->ui_pr = IPPROTO_UDP;
+ ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */
+ /* 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 (udpcksum) {
+ if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
+ ui->ui_sum = 0xffff;
+ }
+ ((struct ip *)ui)->ip_len = m->m_len;
+
+ ((struct ip *)ui)->ip_ttl = ip_defttl;
+ ((struct ip *)ui)->ip_tos = iptos;
+
+ udpstat.udps_opackets++;
+
+ error = ip_output(so, m);
+
+ return (error);
+}
+
+int udp_output(struct socket *so, struct mbuf *m,
+ struct sockaddr_in *addr)
+
+{
+ struct sockaddr_in saddr, daddr;
+
+ saddr = *addr;
+ if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr)
+ saddr.sin_addr.s_addr = so->so_faddr.s_addr;
+ daddr.sin_addr = so->so_laddr;
+ daddr.sin_port = so->so_lport;
+
+ return udp_output2(so, m, &saddr, &daddr, so->so_iptos);
+}
+
+int
+udp_attach(so)
+ struct socket *so;
+{
+ struct sockaddr_in addr;
+
+ if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) {
+ /*
+ * Here, we bind() the socket. Although not really needed
+ * (sendto() on an unbound socket will bind it), it's done
+ * here so that emulation of ytalk etc. don't have to do it
+ */
+ addr.sin_family = AF_INET;
+ addr.sin_port = 0;
+ addr.sin_addr.s_addr = INADDR_ANY;
+ if(bind(so->s, (struct sockaddr *)&addr, sizeof(addr))<0) {
+ int lasterrno=errno;
+ close(so->s);
+ so->s=-1;
+ errno=lasterrno;
+ } else {
+ /* success, insert in queue */
+ so->so_expire = curtime + SO_EXPIRE;
+ insque(so,&udb);
+ }
+ }
+ return(so->s);
+}
+
+void
+udp_detach(so)
+ struct socket *so;
+{
+ close(so->s);
+ /* if (so->so_m) m_free(so->so_m); done by sofree */
+
+ sofree(so);
+}
+
+struct tos_t udptos[] = {
+ {0, 53, IPTOS_LOWDELAY, 0}, /* DNS */
+ {517, 517, IPTOS_LOWDELAY, EMU_TALK}, /* talk */
+ {518, 518, IPTOS_LOWDELAY, EMU_NTALK}, /* ntalk */
+ {0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME}, /* Cu-Seeme */
+ {0, 0, 0, 0}
+};
+
+u_int8_t
+udp_tos(so)
+ 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;
+}
+
+#ifdef EMULATE_TALK
+#include "talkd.h"
+#endif
+
+/*
+ * Here, talk/ytalk/ntalk requests must be emulated
+ */
+void
+udp_emu(so, m)
+ struct socket *so;
+ struct mbuf *m;
+{
+ struct sockaddr_in addr;
+ int addrlen = sizeof(addr);
+#ifdef EMULATE_TALK
+ CTL_MSG_OLD *omsg;
+ CTL_MSG *nmsg;
+ char buff[sizeof(CTL_MSG)];
+ u_char type;
+
+struct talk_request {
+ struct talk_request *next;
+ struct socket *udp_so;
+ struct socket *tcp_so;
+} *req;
+
+ static struct talk_request *req_tbl = 0;
+
+#endif
+
+struct cu_header {
+ char dest[8];
+ short family;
+ u_short port;
+ u_long addr;
+} *cu_head;
+
+ switch(so->so_emu) {
+
+#ifdef EMULATE_TALK
+ case EMU_TALK:
+ case EMU_NTALK:
+ /*
+ * Talk emulation. We always change the ctl_addr to get
+ * some answers from the daemon. When an ANNOUNCE comes,
+ * we send LEAVE_INVITE to the local daemons. Also when a
+ * DELETE comes, we send copies to the local daemons.
+ */
+ if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
+ return;
+
+#define IS_OLD (so->so_emu == EMU_TALK)
+
+#define COPY_MSG(dest, src) { dest->type = src->type; \
+ dest->id_num = src->id_num; \
+ dest->pid = src->pid; \
+ dest->addr = src->addr; \
+ dest->ctl_addr = src->ctl_addr; \
+ memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
+ memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
+ memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); }
+
+#define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
+/* old_sockaddr to sockaddr_in */
+
+
+ if (IS_OLD) { /* old talk */
+ omsg = mtod(m, CTL_MSG_OLD*);
+ nmsg = (CTL_MSG *) buff;
+ type = omsg->type;
+ OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port;
+ OTOSIN(omsg, ctl_addr)->sin_addr = our_addr;
+ strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD);
+ } else { /* new talk */
+ omsg = (CTL_MSG_OLD *) buff;
+ nmsg = mtod(m, CTL_MSG *);
+ type = nmsg->type;
+ OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port;
+ OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr;
+ strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD);
+ }
+
+ if (type == LOOK_UP)
+ return; /* for LOOK_UP this is enough */
+
+ if (IS_OLD) { /* make a copy of the message */
+ COPY_MSG(nmsg, omsg);
+ nmsg->vers = 1;
+ nmsg->answer = 0;
+ } else
+ COPY_MSG(omsg, nmsg);
+
+ /*
+ * If if is an ANNOUNCE message, we go through the
+ * request table to see if a tcp port has already
+ * been redirected for this socket. If not, we solisten()
+ * a new socket and add this entry to the table.
+ * The port number of the tcp socket and our IP
+ * are put to the addr field of the message structures.
+ * Then a LEAVE_INVITE is sent to both local daemon
+ * ports, 517 and 518. This is why we have two copies
+ * of the message, one in old talk and one in new talk
+ * format.
+ */
+
+ if (type == ANNOUNCE) {
+ int s;
+ u_short temp_port;
+
+ for(req = req_tbl; req; req = req->next)
+ if (so == req->udp_so)
+ break; /* found it */
+
+ if (!req) { /* no entry for so, create new */
+ req = (struct talk_request *)
+ malloc(sizeof(struct talk_request));
+ req->udp_so = so;
+ req->tcp_so = solisten(0,
+ OTOSIN(omsg, addr)->sin_addr.s_addr,
+ OTOSIN(omsg, addr)->sin_port,
+ SS_FACCEPTONCE);
+ req->next = req_tbl;
+ req_tbl = req;
+ }
+
+ /* replace port number in addr field */
+ addrlen = sizeof(addr);
+ getsockname(req->tcp_so->s,
+ (struct sockaddr *) &addr,
+ &addrlen);
+ OTOSIN(omsg, addr)->sin_port = addr.sin_port;
+ OTOSIN(omsg, addr)->sin_addr = our_addr;
+ OTOSIN(nmsg, addr)->sin_port = addr.sin_port;
+ OTOSIN(nmsg, addr)->sin_addr = our_addr;
+
+ /* send LEAVE_INVITEs */
+ temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
+ OTOSIN(omsg, ctl_addr)->sin_port = 0;
+ OTOSIN(nmsg, ctl_addr)->sin_port = 0;
+ omsg->type = nmsg->type = LEAVE_INVITE;
+
+ s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
+ addr.sin_addr = our_addr;
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(517);
+ sendto(s, (char *)omsg, sizeof(*omsg), 0,
+ (struct sockaddr *)&addr, sizeof(addr));
+ addr.sin_port = htons(518);
+ sendto(s, (char *)nmsg, sizeof(*nmsg), 0,
+ (struct sockaddr *) &addr, sizeof(addr));
+ close(s) ;
+
+ omsg->type = nmsg->type = ANNOUNCE;
+ OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
+ OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
+ }
+
+ /*
+ * If it is a DELETE message, we send a copy to the
+ * local daemons. Then we delete the entry corresponding
+ * to our socket from the request table.
+ */
+
+ if (type == DELETE) {
+ struct talk_request *temp_req, *req_next;
+ int s;
+ u_short temp_port;
+
+ temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
+ OTOSIN(omsg, ctl_addr)->sin_port = 0;
+ OTOSIN(nmsg, ctl_addr)->sin_port = 0;
+
+ s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
+ addr.sin_addr = our_addr;
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(517);
+ sendto(s, (char *)omsg, sizeof(*omsg), 0,
+ (struct sockaddr *)&addr, sizeof(addr));
+ addr.sin_port = htons(518);
+ sendto(s, (char *)nmsg, sizeof(*nmsg), 0,
+ (struct sockaddr *)&addr, sizeof(addr));
+ close(s);
+
+ OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
+ OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
+
+ /* delete table entry */
+ if (so == req_tbl->udp_so) {
+ temp_req = req_tbl;
+ req_tbl = req_tbl->next;
+ free(temp_req);
+ } else {
+ temp_req = req_tbl;
+ for(req = req_tbl->next; req; req = req_next) {
+ req_next = req->next;
+ if (so == req->udp_so) {
+ temp_req->next = req_next;
+ free(req);
+ break;
+ } else {
+ temp_req = req;
+ }
+ }
+ }
+ }
+
+ return;
+#endif
+
+ case EMU_CUSEEME:
+
+ /*
+ * Cu-SeeMe emulation.
+ * Hopefully the packet is more that 16 bytes long. We don't
+ * do any other tests, just replace the address and port
+ * fields.
+ */
+ if (m->m_len >= sizeof (*cu_head)) {
+ if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
+ return;
+ cu_head = mtod(m, struct cu_header *);
+ cu_head->port = addr.sin_port;
+ cu_head->addr = (u_long) our_addr.s_addr;
+ }
+
+ return;
+ }
+}
+
+struct socket *
+udp_listen(port, laddr, lport, flags)
+ u_int port;
+ u_int32_t laddr;
+ u_int lport;
+ int flags;
+{
+ struct sockaddr_in addr;
+ struct socket *so;
+ int addrlen = sizeof(struct sockaddr_in), opt = 1;
+
+ if ((so = socreate()) == NULL) {
+ free(so);
+ return NULL;
+ }
+ so->s = socket(AF_INET,SOCK_DGRAM,0);
+ so->so_expire = curtime + SO_EXPIRE;
+ insque(so,&udb);
+
+ addr.sin_family = AF_INET;
+ addr.sin_addr.s_addr = INADDR_ANY;
+ addr.sin_port = port;
+
+ if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) {
+ udp_detach(so);
+ return NULL;
+ }
+ setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
+/* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int)); */
+
+ getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
+ 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 = our_addr;
+ else
+ so->so_faddr = addr.sin_addr;
+
+ so->so_lport = lport;
+ so->so_laddr.s_addr = laddr;
+ if (flags != SS_FACCEPTONCE)
+ so->so_expire = 0;
+
+ so->so_state = SS_ISFCONNECTED;
+
+ return so;
+}
diff --git a/slirp/udp.h b/slirp/udp.h
new file mode 100644
index 0000000..195b1bf
--- /dev/null
+++ b/slirp/udp.h
@@ -0,0 +1,109 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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
+
+extern struct socket *udp_last_so;
+
+/*
+ * Udp protocol header.
+ * Per RFC 768, September, 1981.
+ */
+struct udphdr {
+ u_int16_t uh_sport; /* source port */
+ u_int16_t uh_dport; /* destination port */
+ int16_t uh_ulen; /* udp length */
+ u_int16_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_next ui_i.ih_next
+#define ui_prev ui_i.ih_prev
+#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
+
+struct udpstat {
+ /* input statistics: */
+ u_long udps_ipackets; /* total input packets */
+ u_long udps_hdrops; /* packet shorter than header */
+ u_long udps_badsum; /* checksum error */
+ u_long udps_badlen; /* data length larger than packet */
+ u_long udps_noport; /* no socket on port */
+ u_long udps_noportbcast; /* of above, arrived as broadcast */
+ u_long udps_fullsock; /* not delivered, input socket full */
+ u_long udpps_pcbcachemiss; /* input packets missing pcb cache */
+ /* output statistics: */
+ u_long udps_opackets; /* total output packets */
+};
+
+/*
+ * Names for UDP sysctl objects
+ */
+#define UDPCTL_CHECKSUM 1 /* checksum UDP packets */
+#define UDPCTL_MAXID 2
+
+extern struct udpstat udpstat;
+extern struct socket udb;
+
+void udp_init _P((void));
+void udp_input _P((register struct mbuf *, int));
+int udp_output _P((struct socket *, struct mbuf *, struct sockaddr_in *));
+int udp_attach _P((struct socket *));
+void udp_detach _P((struct socket *));
+u_int8_t udp_tos _P((struct socket *));
+void udp_emu _P((struct socket *, struct mbuf *));
+struct socket * udp_listen _P((u_int, u_int32_t, u_int, int));
+int udp_output2(struct socket *so, struct mbuf *m,
+ struct sockaddr_in *saddr, struct sockaddr_in *daddr,
+ int iptos);
+#endif
generated by cgit v1.1 at 2024-12-27 03:15:32 +0000