/* $NetBSD: ip_icmp.c,v 1.87 2004/08/03 13:58:59 cube Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * 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 project 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 PROJECT 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 PROJECT 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. */ /*- * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Public Access Networks Corporation ("Panix"). It was developed under * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe of Zembu Labs, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ /* * 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 */ #include __KERNEL_RCSID(0, "$NetBSD: ip_icmp.c,v 1.87 2004/08/03 13:58:59 cube Exp $"); #include "opt_ipsec.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef IPSEC #include #include #endif #ifdef FAST_IPSEC #include #include #endif /* FAST_IPSEC*/ #include /* * ICMP routines: error generation, receive packet processing, and * routines to turnaround packets back to the originator, and * host table maintenance routines. */ int icmpmaskrepl = 0; #ifdef ICMPPRINTFS int icmpprintfs = 0; #endif int icmpreturndatabytes = 8; struct icmpstat icmpstat; /* * List of callbacks to notify when Path MTU changes are made. */ struct icmp_mtudisc_callback { LIST_ENTRY(icmp_mtudisc_callback) mc_list; void (*mc_func) __P((struct in_addr)); }; LIST_HEAD(, icmp_mtudisc_callback) icmp_mtudisc_callbacks = LIST_HEAD_INITIALIZER(&icmp_mtudisc_callbacks); #if 0 static int ip_next_mtu __P((int, int)); #else /*static*/ int ip_next_mtu __P((int, int)); #endif extern int icmperrppslim; static int icmperrpps_count = 0; static struct timeval icmperrppslim_last; static int icmp_rediraccept = 1; static int icmp_redirtimeout = 600; static struct rttimer_queue *icmp_redirect_timeout_q = NULL; static void icmp_mtudisc_timeout __P((struct rtentry *, struct rttimer *)); static void icmp_redirect_timeout __P((struct rtentry *, struct rttimer *)); static int icmp_ratelimit __P((const struct in_addr *, const int, const int)); void icmp_init() { /* * This is only useful if the user initializes redirtimeout to * something other than zero. */ if (icmp_redirtimeout != 0) { icmp_redirect_timeout_q = rt_timer_queue_create(icmp_redirtimeout); } } /* * Register a Path MTU Discovery callback. */ void icmp_mtudisc_callback_register(func) void (*func) __P((struct in_addr)); { struct icmp_mtudisc_callback *mc; for (mc = LIST_FIRST(&icmp_mtudisc_callbacks); mc != NULL; mc = LIST_NEXT(mc, mc_list)) { if (mc->mc_func == func) return; } mc = malloc(sizeof(*mc), M_PCB, M_NOWAIT); if (mc == NULL) panic("icmp_mtudisc_callback_register"); mc->mc_func = func; LIST_INSERT_HEAD(&icmp_mtudisc_callbacks, mc, mc_list); } /* * Generate an error packet of type error * in response to bad packet ip. */ void icmp_error(n, type, code, dest, destifp) struct mbuf *n; int type, code; n_long dest; struct ifnet *destifp; { struct ip *oip = mtod(n, struct ip *), *nip; unsigned oiplen = oip->ip_hl << 2; struct icmp *icp; struct mbuf *m; unsigned icmplen, mblen; #ifdef ICMPPRINTFS if (icmpprintfs) printf("icmp_error(%x, %d, %d)\n", oip, type, code); #endif if (type != ICMP_REDIRECT) icmpstat.icps_error++; /* * Don't send error if the original packet was encrypted. * Don't send error if not the first fragment of message. * Don't error if the old packet protocol was ICMP * error message, only known informational types. */ if (n->m_flags & M_DECRYPTED) goto freeit; if (oip->ip_off &~ htons(IP_MF|IP_DF)) goto freeit; if (oip->ip_p == IPPROTO_ICMP && type != ICMP_REDIRECT && n->m_len >= oiplen + ICMP_MINLEN && !ICMP_INFOTYPE(((struct icmp *)((caddr_t)oip + oiplen))->icmp_type)) { icmpstat.icps_oldicmp++; goto freeit; } /* Don't send error in response to a multicast or broadcast packet */ if (n->m_flags & (M_BCAST|M_MCAST)) goto freeit; /* * First, do a rate limitation check. */ if (icmp_ratelimit(&oip->ip_src, type, code)) { /* XXX stat */ goto freeit; } /* * Now, formulate icmp message */ icmplen = oiplen + min(icmpreturndatabytes, ntohs(oip->ip_len) - oiplen); /* * Defend against mbuf chains shorter than oip->ip_len - oiplen: */ mblen = 0; for (m = n; m && (mblen < icmplen); m = m->m_next) mblen += m->m_len; icmplen = min(mblen, icmplen); /* * As we are not required to return everything we have, * we return whatever we can return at ease. * * Note that ICMP datagrams longer than 576 octets are out of spec * according to RFC1812; the limit on icmpreturndatabytes below in * icmp_sysctl will keep things below that limit. */ KASSERT(ICMP_MINLEN <= MCLBYTES); if (icmplen + ICMP_MINLEN > MCLBYTES) icmplen = MCLBYTES - ICMP_MINLEN; m = m_gethdr(M_DONTWAIT, MT_HEADER); if (m && (icmplen + ICMP_MINLEN > MHLEN)) { MCLGET(m, M_DONTWAIT); if ((m->m_flags & M_EXT) == 0) { m_freem(m); m = NULL; } } if (m == NULL) goto freeit; MCLAIM(m, n->m_owner); m->m_len = icmplen + ICMP_MINLEN; if ((m->m_flags & M_EXT) == 0) MH_ALIGN(m, m->m_len); icp = mtod(m, struct icmp *); if ((u_int)type > ICMP_MAXTYPE) panic("icmp_error"); icmpstat.icps_outhist[type]++; icp->icmp_type = type; if (type == ICMP_REDIRECT) icp->icmp_gwaddr.s_addr = dest; else { icp->icmp_void = 0; /* * The following assignments assume an overlay with the * zeroed icmp_void field. */ if (type == ICMP_PARAMPROB) { icp->icmp_pptr = code; code = 0; } else if (type == ICMP_UNREACH && code == ICMP_UNREACH_NEEDFRAG && destifp) icp->icmp_nextmtu = htons(destifp->if_mtu); } icp->icmp_code = code; m_copydata(n, 0, icmplen, (caddr_t)&icp->icmp_ip); nip = &icp->icmp_ip; /* * Now, copy old ip header (without options) * in front of icmp message. */ if (m->m_data - sizeof(struct ip) < m->m_pktdat) panic("icmp len"); m->m_data -= sizeof(struct ip); m->m_len += sizeof(struct ip); m->m_pkthdr.len = m->m_len; m->m_pkthdr.rcvif = n->m_pkthdr.rcvif; nip = mtod(m, struct ip *); /* ip_v set in ip_output */ nip->ip_hl = sizeof(struct ip) >> 2; nip->ip_tos = 0; nip->ip_len = htons(m->m_len); /* ip_id set in ip_output */ nip->ip_off = htons(0); /* ip_ttl set in icmp_reflect */ nip->ip_p = IPPROTO_ICMP; nip->ip_src = oip->ip_src; nip->ip_dst = oip->ip_dst; icmp_reflect(m); freeit: m_freem(n); } static struct sockaddr_in icmpsrc = { sizeof (struct sockaddr_in), AF_INET }; static struct sockaddr_in icmpdst = { sizeof (struct sockaddr_in), AF_INET }; static struct sockaddr_in icmpgw = { sizeof (struct sockaddr_in), AF_INET }; struct sockaddr_in icmpmask = { 8, 0 }; /* * Process a received ICMP message. */ void icmp_input(struct mbuf *m, ...) { int proto; struct icmp *icp; struct ip *ip = mtod(m, struct ip *); int icmplen; int i; struct in_ifaddr *ia; void *(*ctlfunc) __P((int, struct sockaddr *, void *)); int code; int hlen; va_list ap; struct rtentry *rt; va_start(ap, m); hlen = va_arg(ap, int); proto = va_arg(ap, int); va_end(ap); /* * Locate icmp structure in mbuf, and check * that not corrupted and of at least minimum length. */ icmplen = ntohs(ip->ip_len) - hlen; #ifdef ICMPPRINTFS if (icmpprintfs) printf("icmp_input from %x to %x, len %d\n", ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr), icmplen); #endif if (icmplen < ICMP_MINLEN) { icmpstat.icps_tooshort++; goto freeit; } i = hlen + min(icmplen, ICMP_ADVLENMIN); if (m->m_len < i && (m = m_pullup(m, i)) == 0) { icmpstat.icps_tooshort++; return; } ip = mtod(m, struct ip *); m->m_len -= hlen; m->m_data += hlen; icp = mtod(m, struct icmp *); /* Don't need to assert alignment, here. */ if (in_cksum(m, icmplen)) { icmpstat.icps_checksum++; goto freeit; } m->m_len += hlen; m->m_data -= hlen; #ifdef ICMPPRINTFS /* * Message type specific processing. */ if (icmpprintfs) printf("icmp_input, type %d code %d\n", icp->icmp_type, icp->icmp_code); #endif if (icp->icmp_type > ICMP_MAXTYPE) goto raw; icmpstat.icps_inhist[icp->icmp_type]++; code = icp->icmp_code; switch (icp->icmp_type) { case ICMP_UNREACH: switch (code) { case ICMP_UNREACH_NET: case ICMP_UNREACH_HOST: case ICMP_UNREACH_PROTOCOL: case ICMP_UNREACH_PORT: case ICMP_UNREACH_SRCFAIL: code += PRC_UNREACH_NET; break; case ICMP_UNREACH_NEEDFRAG: code = PRC_MSGSIZE; break; case ICMP_UNREACH_NET_UNKNOWN: case ICMP_UNREACH_NET_PROHIB: case ICMP_UNREACH_TOSNET: code = PRC_UNREACH_NET; break; case ICMP_UNREACH_HOST_UNKNOWN: case ICMP_UNREACH_ISOLATED: case ICMP_UNREACH_HOST_PROHIB: case ICMP_UNREACH_TOSHOST: code = PRC_UNREACH_HOST; break; default: goto badcode; } goto deliver; case ICMP_TIMXCEED: if (code > 1) goto badcode; code += PRC_TIMXCEED_INTRANS; goto deliver; case ICMP_PARAMPROB: if (code > 1) goto badcode; code = PRC_PARAMPROB; goto deliver; case ICMP_SOURCEQUENCH: if (code) goto badcode; code = PRC_QUENCH; goto deliver; deliver: /* * Problem with datagram; advise higher level routines. */ if (icmplen < ICMP_ADVLENMIN || icmplen < ICMP_ADVLEN(icp) || icp->icmp_ip.ip_hl < (sizeof(struct ip) >> 2)) { icmpstat.icps_badlen++; goto freeit; } if (IN_MULTICAST(icp->icmp_ip.ip_dst.s_addr)) goto badcode; #ifdef ICMPPRINTFS if (icmpprintfs) printf("deliver to protocol %d\n", icp->icmp_ip.ip_p); #endif icmpsrc.sin_addr = icp->icmp_ip.ip_dst; ctlfunc = inetsw[ip_protox[icp->icmp_ip.ip_p]].pr_ctlinput; if (ctlfunc) (void) (*ctlfunc)(code, sintosa(&icmpsrc), &icp->icmp_ip); break; badcode: icmpstat.icps_badcode++; break; case ICMP_ECHO: icp->icmp_type = ICMP_ECHOREPLY; goto reflect; case ICMP_TSTAMP: if (icmplen < ICMP_TSLEN) { icmpstat.icps_badlen++; break; } icp->icmp_type = ICMP_TSTAMPREPLY; icp->icmp_rtime = iptime(); icp->icmp_ttime = icp->icmp_rtime; /* bogus, do later! */ goto reflect; case ICMP_MASKREQ: if (icmpmaskrepl == 0) break; /* * We are not able to respond with all ones broadcast * unless we receive it over a point-to-point interface. */ if (icmplen < ICMP_MASKLEN) { icmpstat.icps_badlen++; break; } if (ip->ip_dst.s_addr == INADDR_BROADCAST || in_nullhost(ip->ip_dst)) icmpdst.sin_addr = ip->ip_src; else icmpdst.sin_addr = ip->ip_dst; ia = ifatoia(ifaof_ifpforaddr(sintosa(&icmpdst), m->m_pkthdr.rcvif)); if (ia == 0) break; icp->icmp_type = ICMP_MASKREPLY; icp->icmp_mask = ia->ia_sockmask.sin_addr.s_addr; if (in_nullhost(ip->ip_src)) { if (ia->ia_ifp->if_flags & IFF_BROADCAST) ip->ip_src = ia->ia_broadaddr.sin_addr; else if (ia->ia_ifp->if_flags & IFF_POINTOPOINT) ip->ip_src = ia->ia_dstaddr.sin_addr; } reflect: icmpstat.icps_reflect++; icmpstat.icps_outhist[icp->icmp_type]++; icmp_reflect(m); return; case ICMP_REDIRECT: if (code > 3) goto badcode; if (icmp_rediraccept == 0) goto freeit; if (icmplen < ICMP_ADVLENMIN || icmplen < ICMP_ADVLEN(icp) || icp->icmp_ip.ip_hl < (sizeof(struct ip) >> 2)) { icmpstat.icps_badlen++; break; } /* * Short circuit routing redirects to force * immediate change in the kernel's routing * tables. The message is also handed to anyone * listening on a raw socket (e.g. the routing * daemon for use in updating its tables). */ icmpgw.sin_addr = ip->ip_src; icmpdst.sin_addr = icp->icmp_gwaddr; #ifdef ICMPPRINTFS if (icmpprintfs) printf("redirect dst %x to %x\n", icp->icmp_ip.ip_dst, icp->icmp_gwaddr); #endif icmpsrc.sin_addr = icp->icmp_ip.ip_dst; rt = NULL; rtredirect(sintosa(&icmpsrc), sintosa(&icmpdst), (struct sockaddr *)0, RTF_GATEWAY | RTF_HOST, sintosa(&icmpgw), (struct rtentry **)&rt); if (rt != NULL && icmp_redirtimeout != 0) { i = rt_timer_add(rt, icmp_redirect_timeout, icmp_redirect_timeout_q); if (i) log(LOG_ERR, "ICMP: redirect failed to " "register timeout for route to %x, " "code %d\n", icp->icmp_ip.ip_dst.s_addr, i); } if (rt != NULL) rtfree(rt); pfctlinput(PRC_REDIRECT_HOST, sintosa(&icmpsrc)); #if defined(IPSEC) || defined(FAST_IPSEC) key_sa_routechange((struct sockaddr *)&icmpsrc); #endif break; /* * No kernel processing for the following; * just fall through to send to raw listener. */ case ICMP_ECHOREPLY: case ICMP_ROUTERADVERT: case ICMP_ROUTERSOLICIT: case ICMP_TSTAMPREPLY: case ICMP_IREQREPLY: case ICMP_MASKREPLY: default: break; } raw: rip_input(m, hlen, proto); return; freeit: m_freem(m); return; } /* * Reflect the ip packet back to the source */ void icmp_reflect(m) struct mbuf *m; { struct ip *ip = mtod(m, struct ip *); struct in_ifaddr *ia; struct ifaddr *ifa; struct sockaddr_in *sin = 0; struct in_addr t; struct mbuf *opts = 0; int optlen = (ip->ip_hl << 2) - sizeof(struct ip); if (!in_canforward(ip->ip_src) && ((ip->ip_src.s_addr & IN_CLASSA_NET) != htonl(IN_LOOPBACKNET << IN_CLASSA_NSHIFT))) { m_freem(m); /* Bad return address */ goto done; /* ip_output() will check for broadcast */ } t = ip->ip_dst; ip->ip_dst = ip->ip_src; /* * If the incoming packet was addressed directly to us, use * dst as the src for the reply. Otherwise (broadcast or * anonymous), use an address which corresponds to the * incoming interface, with a preference for the address which * corresponds to the route to the destination of the ICMP. */ /* Look for packet addressed to us */ INADDR_TO_IA(t, ia); /* look for packet sent to broadcast address */ if (ia == NULL && m->m_pkthdr.rcvif && (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST)) { TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family != AF_INET) continue; if (in_hosteq(t,ifatoia(ifa)->ia_broadaddr.sin_addr)) { ia = ifatoia(ifa); break; } } } if (ia) sin = &ia->ia_addr; icmpdst.sin_addr = t; /* * if the packet is addressed somewhere else, compute the * source address for packets routed back to the source, and * use that, if it's an address on the interface which * received the packet */ if (sin == (struct sockaddr_in *)0 && m->m_pkthdr.rcvif) { struct sockaddr_in sin_dst; struct route icmproute; int errornum; sin_dst.sin_family = AF_INET; sin_dst.sin_len = sizeof(struct sockaddr_in); sin_dst.sin_addr = ip->ip_dst; bzero(&icmproute, sizeof(icmproute)); errornum = 0; sin = in_selectsrc(&sin_dst, &icmproute, 0, NULL, &errornum); /* errornum is never used */ if (icmproute.ro_rt) RTFREE(icmproute.ro_rt); /* check to make sure sin is a source address on rcvif */ if (sin) { t = sin->sin_addr; sin = (struct sockaddr_in *)0; INADDR_TO_IA(t, ia); while (ia) { if (ia->ia_ifp == m->m_pkthdr.rcvif) { sin = &ia->ia_addr; break; } NEXT_IA_WITH_SAME_ADDR(ia); } } } /* * if it was not addressed to us, but the route doesn't go out * the source interface, pick an address on the source * interface. This can happen when routing is asymmetric, or * when the incoming packet was encapsulated */ if (sin == (struct sockaddr_in *)0 && m->m_pkthdr.rcvif) { TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family != AF_INET) continue; sin = &(ifatoia(ifa)->ia_addr); break; } } /* * The following happens if the packet was not addressed to us, * and was received on an interface with no IP address: * We find the first AF_INET address on the first non-loopback * interface. */ if (sin == (struct sockaddr_in *)0) TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { if (ia->ia_ifp->if_flags & IFF_LOOPBACK) continue; sin = &ia->ia_addr; break; } /* * If we still didn't find an address, punt. We could have an * interface up (and receiving packets) with no address. */ if (sin == (struct sockaddr_in *)0) { m_freem(m); goto done; } ip->ip_src = sin->sin_addr; ip->ip_ttl = MAXTTL; if (optlen > 0) { u_char *cp; int opt, cnt; u_int len; /* * Retrieve any source routing from the incoming packet; * add on any record-route or timestamp options. */ cp = (u_char *) (ip + 1); if ((opts = ip_srcroute()) == 0 && (opts = m_gethdr(M_DONTWAIT, MT_HEADER))) { MCLAIM(opts, m->m_owner); opts->m_len = sizeof(struct in_addr); *mtod(opts, struct in_addr *) = zeroin_addr; } if (opts) { #ifdef ICMPPRINTFS if (icmpprintfs) printf("icmp_reflect optlen %d rt %d => ", optlen, opts->m_len); #endif for (cnt = optlen; cnt > 0; cnt -= len, cp += len) { opt = cp[IPOPT_OPTVAL]; if (opt == IPOPT_EOL) break; if (opt == IPOPT_NOP) len = 1; else { if (cnt < IPOPT_OLEN + sizeof(*cp)) break; len = cp[IPOPT_OLEN]; if (len < IPOPT_OLEN + sizeof(*cp) || len > cnt) break; } /* * Should check for overflow, but it "can't happen" */ if (opt == IPOPT_RR || opt == IPOPT_TS || opt == IPOPT_SECURITY) { bcopy((caddr_t)cp, mtod(opts, caddr_t) + opts->m_len, len); opts->m_len += len; } } /* Terminate & pad, if necessary */ if ((cnt = opts->m_len % 4) != 0) { for (; cnt < 4; cnt++) { *(mtod(opts, caddr_t) + opts->m_len) = IPOPT_EOL; opts->m_len++; } } #ifdef ICMPPRINTFS if (icmpprintfs) printf("%d\n", opts->m_len); #endif } /* * Now strip out original options by copying rest of first * mbuf's data back, and adjust the IP length. */ ip->ip_len = htons(ntohs(ip->ip_len) - optlen); ip->ip_hl = sizeof(struct ip) >> 2; m->m_len -= optlen; if (m->m_flags & M_PKTHDR) m->m_pkthdr.len -= optlen; optlen += sizeof(struct ip); bcopy((caddr_t)ip + optlen, (caddr_t)(ip + 1), (unsigned)(m->m_len - sizeof(struct ip))); } m_tag_delete_nonpersistent(m); m->m_flags &= ~(M_BCAST|M_MCAST); /* * Clear any in-bound checksum flags for this packet. */ if (m->m_flags & M_PKTHDR) m->m_pkthdr.csum_flags = 0; icmp_send(m, opts); done: if (opts) (void)m_free(opts); } /* * Send an icmp packet back to the ip level, * after supplying a checksum. */ void icmp_send(m, opts) struct mbuf *m; struct mbuf *opts; { struct ip *ip = mtod(m, struct ip *); int hlen; struct icmp *icp; hlen = ip->ip_hl << 2; m->m_data += hlen; m->m_len -= hlen; icp = mtod(m, struct icmp *); icp->icmp_cksum = 0; icp->icmp_cksum = in_cksum(m, ntohs(ip->ip_len) - hlen); m->m_data -= hlen; m->m_len += hlen; #ifdef ICMPPRINTFS if (icmpprintfs) printf("icmp_send dst %x src %x\n", ip->ip_dst, ip->ip_src); #endif (void) ip_output(m, opts, NULL, 0, (struct ip_moptions *)NULL, (struct socket *)NULL); } n_time iptime() { struct timeval atv; u_long t; microtime(&atv); t = (atv.tv_sec % (24*60*60)) * 1000 + atv.tv_usec / 1000; return (htonl(t)); } /* * sysctl helper routine for net.inet.icmp.returndatabytes. ensures * that the new value is in the correct range. */ static int sysctl_net_inet_icmp_returndatabytes(SYSCTLFN_ARGS) { int error, t; struct sysctlnode node; node = *rnode; node.sysctl_data = &t; t = icmpreturndatabytes; error = sysctl_lookup(SYSCTLFN_CALL(&node)); if (error || newp == NULL) return (error); if (t < 8 || t > 512) return (EINVAL); icmpreturndatabytes = t; return (0); } /* * sysctl helper routine for net.inet.icmp.redirtimeout. ensures that * the given value is not less than zero and then resets the timeout * queue. */ static int sysctl_net_inet_icmp_redirtimeout(SYSCTLFN_ARGS) { int error, tmp; struct sysctlnode node; node = *rnode; node.sysctl_data = &tmp; tmp = icmp_redirtimeout; error = sysctl_lookup(SYSCTLFN_CALL(&node)); if (error || newp == NULL) return (error); if (tmp < 0) return (EINVAL); icmp_redirtimeout = tmp; /* * was it a *defined* side-effect that anyone even *reading* * this value causes these things to happen? */ if (icmp_redirect_timeout_q != NULL) { if (icmp_redirtimeout == 0) { rt_timer_queue_destroy(icmp_redirect_timeout_q, TRUE); icmp_redirect_timeout_q = NULL; } else { rt_timer_queue_change(icmp_redirect_timeout_q, icmp_redirtimeout); } } else if (icmp_redirtimeout > 0) { icmp_redirect_timeout_q = rt_timer_queue_create(icmp_redirtimeout); } return (0); } SYSCTL_SETUP(sysctl_net_inet_icmp_setup, "sysctl net.inet.icmp subtree setup") { sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "net", NULL, NULL, 0, NULL, 0, CTL_NET, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "inet", NULL, NULL, 0, NULL, 0, CTL_NET, PF_INET, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "icmp", SYSCTL_DESCR("ICMPv4 related settings"), NULL, 0, NULL, 0, CTL_NET, PF_INET, IPPROTO_ICMP, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "maskrepl", SYSCTL_DESCR("Respond to ICMP_MASKREQ messages"), NULL, 0, &icmpmaskrepl, 0, CTL_NET, PF_INET, IPPROTO_ICMP, ICMPCTL_MASKREPL, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "returndatabytes", SYSCTL_DESCR("Number of bytes to return in an ICMP " "error message"), sysctl_net_inet_icmp_returndatabytes, 0, &icmpreturndatabytes, 0, CTL_NET, PF_INET, IPPROTO_ICMP, ICMPCTL_RETURNDATABYTES, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "errppslimit", SYSCTL_DESCR("Maximum number of outgoing ICMP error " "messages per second"), NULL, 0, &icmperrppslim, 0, CTL_NET, PF_INET, IPPROTO_ICMP, ICMPCTL_ERRPPSLIMIT, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "rediraccept", SYSCTL_DESCR("Accept ICMP_REDIRECT messages"), NULL, 0, &icmp_rediraccept, 0, CTL_NET, PF_INET, IPPROTO_ICMP, ICMPCTL_REDIRACCEPT, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "redirtimeout", SYSCTL_DESCR("Lifetime of ICMP_REDIRECT generated " "routes"), sysctl_net_inet_icmp_redirtimeout, 0, &icmp_redirtimeout, 0, CTL_NET, PF_INET, IPPROTO_ICMP, ICMPCTL_REDIRTIMEOUT, CTL_EOL); } /* Table of common MTUs: */ static const u_int mtu_table[] = { 65535, 65280, 32000, 17914, 9180, 8166, 4352, 2002, 1492, 1006, 508, 296, 68, 0 }; void icmp_mtudisc(icp, faddr) struct icmp *icp; struct in_addr faddr; { struct icmp_mtudisc_callback *mc; struct sockaddr *dst = sintosa(&icmpsrc); struct rtentry *rt; u_long mtu = ntohs(icp->icmp_nextmtu); /* Why a long? IPv6 */ int error; rt = rtalloc1(dst, 1); if (rt == 0) return; /* If we didn't get a host route, allocate one */ if ((rt->rt_flags & RTF_HOST) == 0) { struct rtentry *nrt; error = rtrequest((int) RTM_ADD, dst, (struct sockaddr *) rt->rt_gateway, (struct sockaddr *) 0, RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); if (error) { rtfree(rt); return; } nrt->rt_rmx = rt->rt_rmx; rtfree(rt); rt = nrt; } error = rt_timer_add(rt, icmp_mtudisc_timeout, ip_mtudisc_timeout_q); if (error) { rtfree(rt); return; } if (mtu == 0) { int i = 0; mtu = ntohs(icp->icmp_ip.ip_len); /* Some 4.2BSD-based routers incorrectly adjust the ip_len */ if (mtu > rt->rt_rmx.rmx_mtu && rt->rt_rmx.rmx_mtu != 0) mtu -= (icp->icmp_ip.ip_hl << 2); /* If we still can't guess a value, try the route */ if (mtu == 0) { mtu = rt->rt_rmx.rmx_mtu; /* If no route mtu, default to the interface mtu */ if (mtu == 0) mtu = rt->rt_ifp->if_mtu; } for (i = 0; i < sizeof(mtu_table) / sizeof(mtu_table[0]); i++) if (mtu > mtu_table[i]) { mtu = mtu_table[i]; break; } } /* * XXX: RTV_MTU is overloaded, since the admin can set it * to turn off PMTU for a route, and the kernel can * set it to indicate a serious problem with PMTU * on a route. We should be using a separate flag * for the kernel to indicate this. */ if ((rt->rt_rmx.rmx_locks & RTV_MTU) == 0) { if (mtu < 296 || mtu > rt->rt_ifp->if_mtu) rt->rt_rmx.rmx_locks |= RTV_MTU; else if (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0) { icmpstat.icps_pmtuchg++; rt->rt_rmx.rmx_mtu = mtu; } } if (rt) rtfree(rt); /* * Notify protocols that the MTU for this destination * has changed. */ for (mc = LIST_FIRST(&icmp_mtudisc_callbacks); mc != NULL; mc = LIST_NEXT(mc, mc_list)) (*mc->mc_func)(faddr); } /* * Return the next larger or smaller MTU plateau (table from RFC 1191) * given current value MTU. If DIR is less than zero, a larger plateau * is returned; otherwise, a smaller value is returned. */ int ip_next_mtu(mtu, dir) /* XXX */ int mtu; int dir; { int i; for (i = 0; i < (sizeof mtu_table) / (sizeof mtu_table[0]); i++) { if (mtu >= mtu_table[i]) break; } if (dir < 0) { if (i == 0) { return 0; } else { return mtu_table[i - 1]; } } else { if (mtu_table[i] == 0) { return 0; } else if (mtu > mtu_table[i]) { return mtu_table[i]; } else { return mtu_table[i + 1]; } } } static void icmp_mtudisc_timeout(rt, r) struct rtentry *rt; struct rttimer *r; { if (rt == NULL) panic("icmp_mtudisc_timeout: bad route to timeout"); if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == (RTF_DYNAMIC | RTF_HOST)) { rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt), rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); } else { if ((rt->rt_rmx.rmx_locks & RTV_MTU) == 0) { rt->rt_rmx.rmx_mtu = 0; } } } static void icmp_redirect_timeout(rt, r) struct rtentry *rt; struct rttimer *r; { if (rt == NULL) panic("icmp_redirect_timeout: bad route to timeout"); if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == (RTF_DYNAMIC | RTF_HOST)) { rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt), rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); } } /* * Perform rate limit check. * Returns 0 if it is okay to send the icmp packet. * Returns 1 if the router SHOULD NOT send this icmp packet due to rate * limitation. * * XXX per-destination/type check necessary? */ static int icmp_ratelimit(dst, type, code) const struct in_addr *dst; const int type; /* not used at this moment */ const int code; /* not used at this moment */ { /* PPS limit */ if (!ppsratecheck(&icmperrppslim_last, &icmperrpps_count, icmperrppslim)) { /* The packet is subject to rate limit */ return 1; } /*okay to send*/ return 0; }