diff options
Diffstat (limited to 'slirp/src/ip_icmp.c')
| m--------- | slirp | 0 | ||||
| -rw-r--r-- | slirp/src/ip_icmp.c | 470 |
2 files changed, 0 insertions, 470 deletions
diff --git a/slirp b/slirp new file mode 160000 +Subproject 59a1b1f165458c2acb7ff0525b543945f741622 diff --git a/slirp/src/ip_icmp.c b/slirp/src/ip_icmp.c deleted file mode 100644 index 1aea18a..0000000 --- a/slirp/src/ip_icmp.c +++ /dev/null @@ -1,470 +0,0 @@ -/* SPDX-License-Identifier: BSD-3-Clause */ -/* - * Copyright (c) 1982, 1986, 1988, 1993 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 - * ip_icmp.c,v 1.7 1995/05/30 08:09:42 rgrimes Exp - */ - -#include "slirp.h" -#include "ip_icmp.h" - -#ifndef WITH_ICMP_ERROR_MSG -#define WITH_ICMP_ERROR_MSG 0 -#endif - -/* The message sent when emulating PING */ -/* Be nice and tell them it's just a pseudo-ping packet */ -static const char icmp_ping_msg[] = "This is a pseudo-PING packet used by Slirp to emulate ICMP ECHO-REQUEST packets.\n"; - -/* list of actions for icmp_send_error() on RX of an icmp message */ -static const int icmp_flush[19] = { -/* ECHO REPLY (0) */ 0, - 1, - 1, -/* DEST UNREACH (3) */ 1, -/* SOURCE QUENCH (4)*/ 1, -/* REDIRECT (5) */ 1, - 1, - 1, -/* ECHO (8) */ 0, -/* ROUTERADVERT (9) */ 1, -/* ROUTERSOLICIT (10) */ 1, -/* TIME EXCEEDED (11) */ 1, -/* PARAMETER PROBLEM (12) */ 1, -/* TIMESTAMP (13) */ 0, -/* TIMESTAMP REPLY (14) */ 0, -/* INFO (15) */ 0, -/* INFO REPLY (16) */ 0, -/* ADDR MASK (17) */ 0, -/* ADDR MASK REPLY (18) */ 0 -}; - -void icmp_init(Slirp *slirp) -{ - slirp->icmp.so_next = slirp->icmp.so_prev = &slirp->icmp; - slirp->icmp_last_so = &slirp->icmp; -} - -void icmp_cleanup(Slirp *slirp) -{ - while (slirp->icmp.so_next != &slirp->icmp) { - icmp_detach(slirp->icmp.so_next); - } -} - -static int icmp_send(struct socket *so, struct mbuf *m, int hlen) -{ - struct ip *ip = mtod(m, struct ip *); - struct sockaddr_in addr; - - so->s = slirp_socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP); - if (so->s == -1) { - return -1; - } - - so->so_m = m; - so->so_faddr = ip->ip_dst; - so->so_laddr = ip->ip_src; - so->so_iptos = ip->ip_tos; - so->so_type = IPPROTO_ICMP; - so->so_state = SS_ISFCONNECTED; - so->so_expire = curtime + SO_EXPIRE; - - addr.sin_family = AF_INET; - addr.sin_addr = so->so_faddr; - - insque(so, &so->slirp->icmp); - - if (sendto(so->s, m->m_data + hlen, m->m_len - hlen, 0, - (struct sockaddr *)&addr, sizeof(addr)) == -1) { - DEBUG_MISC("icmp_input icmp sendto tx errno = %d-%s", - errno, strerror(errno)); - icmp_send_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno)); - icmp_detach(so); - } - - return 0; -} - -void icmp_detach(struct socket *so) -{ - so->slirp->cb->unregister_poll_fd(so->s, so->slirp->opaque); - closesocket(so->s); - sofree(so); -} - -/* - * Process a received ICMP message. - */ -void -icmp_input(struct mbuf *m, int hlen) -{ - register struct icmp *icp; - register struct ip *ip=mtod(m, struct ip *); - int icmplen=ip->ip_len; - Slirp *slirp = m->slirp; - - DEBUG_CALL("icmp_input"); - DEBUG_ARG("m = %p", m); - DEBUG_ARG("m_len = %d", m->m_len); - - /* - * Locate icmp structure in mbuf, and check - * that its not corrupted and of at least minimum length. - */ - if (icmplen < ICMP_MINLEN) { /* min 8 bytes payload */ - freeit: - m_free(m); - goto end_error; - } - - m->m_len -= hlen; - m->m_data += hlen; - icp = mtod(m, struct icmp *); - if (cksum(m, icmplen)) { - goto freeit; - } - m->m_len += hlen; - m->m_data -= hlen; - - DEBUG_ARG("icmp_type = %d", icp->icmp_type); - switch (icp->icmp_type) { - case ICMP_ECHO: - ip->ip_len += hlen; /* since ip_input subtracts this */ - if (ip->ip_dst.s_addr == slirp->vhost_addr.s_addr || - ip->ip_dst.s_addr == slirp->vnameserver_addr.s_addr) { - icmp_reflect(m); - } else if (slirp->restricted) { - goto freeit; - } else { - struct socket *so; - struct sockaddr_storage addr; - so = socreate(slirp); - if (icmp_send(so, m, hlen) == 0) { - return; - } - if (udp_attach(so, AF_INET) == -1) { - DEBUG_MISC("icmp_input udp_attach errno = %d-%s", - errno,strerror(errno)); - sofree(so); - m_free(m); - goto end_error; - } - so->so_m = m; - so->so_ffamily = AF_INET; - so->so_faddr = ip->ip_dst; - so->so_fport = htons(7); - so->so_lfamily = AF_INET; - so->so_laddr = ip->ip_src; - so->so_lport = htons(9); - so->so_iptos = ip->ip_tos; - so->so_type = IPPROTO_ICMP; - so->so_state = SS_ISFCONNECTED; - - /* Send the packet */ - addr = so->fhost.ss; - sotranslate_out(so, &addr); - - if(sendto(so->s, icmp_ping_msg, strlen(icmp_ping_msg), 0, - (struct sockaddr *)&addr, sockaddr_size(&addr)) == -1) { - DEBUG_MISC("icmp_input udp sendto tx errno = %d-%s", - errno,strerror(errno)); - icmp_send_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno)); - udp_detach(so); - } - } /* if ip->ip_dst.s_addr == alias_addr.s_addr */ - break; - case ICMP_UNREACH: - /* XXX? report error? close socket? */ - case ICMP_TIMXCEED: - case ICMP_PARAMPROB: - case ICMP_SOURCEQUENCH: - case ICMP_TSTAMP: - case ICMP_MASKREQ: - case ICMP_REDIRECT: - m_free(m); - break; - - default: - m_free(m); - } /* swith */ - -end_error: - /* m is m_free()'d xor put in a socket xor or given to ip_send */ - return; -} - - -/* - * Send an ICMP message in response to a situation - * - * RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header. MAY send more (we do). - * MUST NOT change this header information. - * MUST NOT reply to a multicast/broadcast IP address. - * MUST NOT reply to a multicast/broadcast MAC address. - * MUST reply to only the first fragment. - */ -/* - * Send ICMP_UNREACH back to the source regarding msrc. - * mbuf *msrc is used as a template, but is NOT m_free()'d. - * It is reported as the bad ip packet. The header should - * be fully correct and in host byte order. - * ICMP fragmentation is illegal. All machines must accept 576 bytes in one - * packet. The maximum payload is 576-20(ip hdr)-8(icmp hdr)=548 - */ - -#define ICMP_MAXDATALEN (IP_MSS-28) -void -icmp_send_error(struct mbuf *msrc, uint8_t type, uint8_t code, int minsize, - const char *message) -{ - unsigned hlen, shlen, s_ip_len; - register struct ip *ip; - register struct icmp *icp; - register struct mbuf *m; - - DEBUG_CALL("icmp_send_error"); - DEBUG_ARG("msrc = %p", msrc); - DEBUG_ARG("msrc_len = %d", msrc->m_len); - - if(type!=ICMP_UNREACH && type!=ICMP_TIMXCEED) goto end_error; - - /* check msrc */ - if(!msrc) goto end_error; - ip = mtod(msrc, struct ip *); - if (slirp_debug & DBG_MISC) { - char bufa[20], bufb[20]; - strcpy(bufa, inet_ntoa(ip->ip_src)); - strcpy(bufb, inet_ntoa(ip->ip_dst)); - DEBUG_MISC(" %.16s to %.16s", bufa, bufb); - } - if(ip->ip_off & IP_OFFMASK) goto end_error; /* Only reply to fragment 0 */ - - /* Do not reply to source-only IPs */ - if ((ip->ip_src.s_addr & htonl(~(0xf << 28))) == 0) { - goto end_error; - } - - shlen=ip->ip_hl << 2; - s_ip_len=ip->ip_len; - if(ip->ip_p == IPPROTO_ICMP) { - icp = (struct icmp *)((char *)ip + shlen); - /* - * Assume any unknown ICMP type is an error. This isn't - * specified by the RFC, but think about it.. - */ - if(icp->icmp_type>18 || icmp_flush[icp->icmp_type]) goto end_error; - } - - /* make a copy */ - m = m_get(msrc->slirp); - if (!m) { - goto end_error; - } - - { int new_m_size; - new_m_size=sizeof(struct ip )+ICMP_MINLEN+msrc->m_len+ICMP_MAXDATALEN; - if(new_m_size>m->m_size) m_inc(m, new_m_size); - } - memcpy(m->m_data, msrc->m_data, msrc->m_len); - m->m_len = msrc->m_len; /* copy msrc to m */ - - /* make the header of the reply packet */ - ip = mtod(m, struct ip *); - hlen= sizeof(struct ip ); /* no options in reply */ - - /* fill in icmp */ - m->m_data += hlen; - m->m_len -= hlen; - - icp = mtod(m, struct icmp *); - - if(minsize) s_ip_len=shlen+ICMP_MINLEN; /* return header+8b only */ - else if(s_ip_len>ICMP_MAXDATALEN) /* maximum size */ - s_ip_len=ICMP_MAXDATALEN; - - m->m_len=ICMP_MINLEN+s_ip_len; /* 8 bytes ICMP header */ - - /* min. size = 8+sizeof(struct ip)+8 */ - - icp->icmp_type = type; - icp->icmp_code = code; - icp->icmp_id = 0; - icp->icmp_seq = 0; - - memcpy(&icp->icmp_ip, msrc->m_data, s_ip_len); /* report the ip packet */ - HTONS(icp->icmp_ip.ip_len); - HTONS(icp->icmp_ip.ip_id); - HTONS(icp->icmp_ip.ip_off); - - if (message && WITH_ICMP_ERROR_MSG) { /* append message to ICMP packet */ - int message_len; - char *cpnt; - message_len=strlen(message); - if(message_len>ICMP_MAXDATALEN) message_len=ICMP_MAXDATALEN; - cpnt=(char *)m->m_data+m->m_len; - memcpy(cpnt, message, message_len); - m->m_len+=message_len; - } - - icp->icmp_cksum = 0; - icp->icmp_cksum = cksum(m, m->m_len); - - m->m_data -= hlen; - m->m_len += hlen; - - /* fill in ip */ - ip->ip_hl = hlen >> 2; - ip->ip_len = m->m_len; - - ip->ip_tos=((ip->ip_tos & 0x1E) | 0xC0); /* high priority for errors */ - - ip->ip_ttl = MAXTTL; - ip->ip_p = IPPROTO_ICMP; - ip->ip_dst = ip->ip_src; /* ip addresses */ - ip->ip_src = m->slirp->vhost_addr; - - (void ) ip_output((struct socket *)NULL, m); - -end_error: - return; -} -#undef ICMP_MAXDATALEN - -/* - * Reflect the ip packet back to the source - */ -void -icmp_reflect(struct mbuf *m) -{ - register struct ip *ip = mtod(m, struct ip *); - int hlen = ip->ip_hl << 2; - int optlen = hlen - sizeof(struct ip ); - register struct icmp *icp; - - /* - * Send an icmp packet back to the ip level, - * after supplying a checksum. - */ - m->m_data += hlen; - m->m_len -= hlen; - icp = mtod(m, struct icmp *); - - icp->icmp_type = ICMP_ECHOREPLY; - icp->icmp_cksum = 0; - icp->icmp_cksum = cksum(m, ip->ip_len - hlen); - - m->m_data -= hlen; - m->m_len += hlen; - - /* fill in ip */ - if (optlen > 0) { - /* - * Strip out original options by copying rest of first - * mbuf's data back, and adjust the IP length. - */ - memmove((char *)(ip + 1), (char *)ip + hlen, - (unsigned )(m->m_len - hlen)); - hlen -= optlen; - ip->ip_hl = hlen >> 2; - ip->ip_len -= optlen; - m->m_len -= optlen; - } - - ip->ip_ttl = MAXTTL; - { /* swap */ - struct in_addr icmp_dst; - icmp_dst = ip->ip_dst; - ip->ip_dst = ip->ip_src; - ip->ip_src = icmp_dst; - } - - (void ) ip_output((struct socket *)NULL, m); -} - -void icmp_receive(struct socket *so) -{ - struct mbuf *m = so->so_m; - struct ip *ip = mtod(m, struct ip *); - int hlen = ip->ip_hl << 2; - uint8_t error_code; - struct icmp *icp; - int id, len; - - m->m_data += hlen; - m->m_len -= hlen; - icp = mtod(m, struct icmp *); - - id = icp->icmp_id; - len = recv(so->s, icp, M_ROOM(m), 0); - /* - * The behavior of reading SOCK_DGRAM+IPPROTO_ICMP sockets is inconsistent - * between host OSes. On Linux, only the ICMP header and payload is - * included. On macOS/Darwin, the socket acts like a raw socket and - * includes the IP header as well. On other BSDs, SOCK_DGRAM+IPPROTO_ICMP - * sockets aren't supported at all, so we treat them like raw sockets. It - * isn't possible to detect this difference at runtime, so we must use an - * #ifdef to determine if we need to remove the IP header. - */ -#ifdef CONFIG_BSD - if (len >= sizeof(struct ip)) { - struct ip *inner_ip = mtod(m, struct ip *); - int inner_hlen = inner_ip->ip_hl << 2; - if (inner_hlen > len) { - len = -1; - errno = -EINVAL; - } else { - len -= inner_hlen; - memmove(icp, (unsigned char *)icp + inner_hlen, len); - } - } else { - len = -1; - errno = -EINVAL; - } -#endif - icp->icmp_id = id; - - m->m_data -= hlen; - m->m_len += hlen; - - if (len == -1 || len == 0) { - if (errno == ENETUNREACH) { - error_code = ICMP_UNREACH_NET; - } else { - error_code = ICMP_UNREACH_HOST; - } - DEBUG_MISC(" udp icmp rx errno = %d-%s", errno, - strerror(errno)); - icmp_send_error(so->so_m, ICMP_UNREACH, error_code, 0, strerror(errno)); - } else { - icmp_reflect(so->so_m); - so->so_m = NULL; /* Don't m_free() it again! */ - } - icmp_detach(so); -} |