/* $OpenBSD: icmp6.c,v 1.64 2002/09/11 03:15:36 itojun Exp $ */ /* $KAME: icmp6.c,v 1.217 2001/06/20 15:03:29 jinmei 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) 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 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "faith.h" /* inpcb members */ #define in6pcb inpcb #define in6p_laddr inp_laddr6 #define in6p_faddr inp_faddr6 #define in6p_icmp6filt inp_icmp6filt #define in6p_route inp_route #define in6p_socket inp_socket #define in6p_flags inp_flags #define in6p_moptions inp_moptions6 #define in6p_outputopts inp_outputopts6 #define in6p_ip6 inp_ipv6 #define in6p_flowinfo inp_flowinfo #define in6p_sp inp_sp #define in6p_next inp_next #define in6p_prev inp_prev /* macro names */ #define sotoin6pcb sotoinpcb /* function names */ #define in6_pcbdetach in_pcbdetach #define in6_rtchange in_rtchange /* * for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from * others... */ #define in6p_ip6_nxt inp_ipv6.ip6_nxt extern struct domain inet6domain; extern struct ip6protosw inet6sw[]; extern u_char ip6_protox[]; struct icmp6stat icmp6stat; extern struct inpcbtable rawin6pcbtable; extern int icmp6errppslim; static int icmp6errpps_count = 0; static struct timeval icmp6errppslim_last; extern int icmp6_nodeinfo; /* * List of callbacks to notify when Path MTU changes are made. */ struct icmp6_mtudisc_callback { LIST_ENTRY(icmp6_mtudisc_callback) mc_list; void (*mc_func)(struct in6_addr *); }; LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks); static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; extern int pmtu_expire; /* XXX do these values make any sense? */ static int icmp6_mtudisc_hiwat = 1280; static int icmp6_mtudisc_lowat = 256; /* * keep track of # of redirect routes. */ static struct rttimer_queue *icmp6_redirect_timeout_q = NULL; /* XXX experimental, turned off */ static int icmp6_redirect_hiwat = -1; static int icmp6_redirect_lowat = -1; static void icmp6_errcount(struct icmp6errstat *, int, int); static int icmp6_rip6_input(struct mbuf **, int); static int icmp6_ratelimit(const struct in6_addr *, const int, const int); static const char *icmp6_redirect_diag(struct in6_addr *, struct in6_addr *, struct in6_addr *); static struct mbuf *ni6_input(struct mbuf *, int); static struct mbuf *ni6_nametodns(const char *, int, int); static int ni6_dnsmatch(const char *, int, const char *, int); static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *, struct ifnet **, char *); static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, struct ifnet *, int); static int icmp6_notify_error(struct mbuf *, int, int, int); static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *); static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *); static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *); void icmp6_init() { mld6_init(); icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout); } static void icmp6_errcount(stat, type, code) struct icmp6errstat *stat; int type, code; { switch (type) { case ICMP6_DST_UNREACH: switch (code) { case ICMP6_DST_UNREACH_NOROUTE: stat->icp6errs_dst_unreach_noroute++; return; case ICMP6_DST_UNREACH_ADMIN: stat->icp6errs_dst_unreach_admin++; return; case ICMP6_DST_UNREACH_BEYONDSCOPE: stat->icp6errs_dst_unreach_beyondscope++; return; case ICMP6_DST_UNREACH_ADDR: stat->icp6errs_dst_unreach_addr++; return; case ICMP6_DST_UNREACH_NOPORT: stat->icp6errs_dst_unreach_noport++; return; } break; case ICMP6_PACKET_TOO_BIG: stat->icp6errs_packet_too_big++; return; case ICMP6_TIME_EXCEEDED: switch (code) { case ICMP6_TIME_EXCEED_TRANSIT: stat->icp6errs_time_exceed_transit++; return; case ICMP6_TIME_EXCEED_REASSEMBLY: stat->icp6errs_time_exceed_reassembly++; return; } break; case ICMP6_PARAM_PROB: switch (code) { case ICMP6_PARAMPROB_HEADER: stat->icp6errs_paramprob_header++; return; case ICMP6_PARAMPROB_NEXTHEADER: stat->icp6errs_paramprob_nextheader++; return; case ICMP6_PARAMPROB_OPTION: stat->icp6errs_paramprob_option++; return; } break; case ND_REDIRECT: stat->icp6errs_redirect++; return; } stat->icp6errs_unknown++; } /* * Register a Path MTU Discovery callback. */ void icmp6_mtudisc_callback_register(func) void (*func)(struct in6_addr *); { struct icmp6_mtudisc_callback *mc; for (mc = LIST_FIRST(&icmp6_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("icmp6_mtudisc_callback_register"); mc->mc_func = func; LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, mc, mc_list); } /* * Generate an error packet of type error in response to bad IP6 packet. */ void icmp6_error(m, type, code, param) struct mbuf *m; int type, code, param; { struct ip6_hdr *oip6, *nip6; struct icmp6_hdr *icmp6; u_int preplen; int off; int nxt; icmp6stat.icp6s_error++; /* count per-type-code statistics */ icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code); #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); #else if (m->m_len < sizeof(struct ip6_hdr)) { m = m_pullup(m, sizeof(struct ip6_hdr)); if (m == NULL) return; } #endif oip6 = mtod(m, struct ip6_hdr *); /* * If the destination address of the erroneous packet is a multicast * address, or the packet was sent using link-layer multicast, * we should basically suppress sending an error (RFC 2463, Section * 2.4). * We have two exceptions (the item e.2 in that section): * - the Pakcet Too Big message can be sent for path MTU discovery. * - the Parameter Problem Message that can be allowed an icmp6 error * in the option type field. This check has been done in * ip6_unknown_opt(), so we can just check the type and code. */ if ((m->m_flags & (M_BCAST|M_MCAST) || IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && (type != ICMP6_PACKET_TOO_BIG && (type != ICMP6_PARAM_PROB || code != ICMP6_PARAMPROB_OPTION))) goto freeit; /* * RFC 2463, 2.4 (e.5): source address check. * XXX: the case of anycast source? */ if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) goto freeit; /* * If we are about to send ICMPv6 against ICMPv6 error/redirect, * don't do it. */ nxt = -1; off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); if (off >= 0 && nxt == IPPROTO_ICMPV6) { struct icmp6_hdr *icp; #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), ); icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); #else IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, sizeof(*icp)); if (icp == NULL) { icmp6stat.icp6s_tooshort++; return; } #endif if (icp->icmp6_type < ICMP6_ECHO_REQUEST || icp->icmp6_type == ND_REDIRECT) { /* * ICMPv6 error * Special case: for redirect (which is * informational) we must not send icmp6 error. */ icmp6stat.icp6s_canterror++; goto freeit; } else { /* ICMPv6 informational - send the error */ } } else { /* non-ICMPv6 - send the error */ } oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ /* Finally, do rate limitation check. */ if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { icmp6stat.icp6s_toofreq++; goto freeit; } /* * OK, ICMP6 can be generated. */ if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); M_PREPEND(m, preplen, M_DONTWAIT); if (m && m->m_len < preplen) m = m_pullup(m, preplen); if (m == NULL) { nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__)); return; } nip6 = mtod(m, struct ip6_hdr *); nip6->ip6_src = oip6->ip6_src; nip6->ip6_dst = oip6->ip6_dst; if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) oip6->ip6_src.s6_addr16[1] = 0; if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) oip6->ip6_dst.s6_addr16[1] = 0; icmp6 = (struct icmp6_hdr *)(nip6 + 1); icmp6->icmp6_type = type; icmp6->icmp6_code = code; icmp6->icmp6_pptr = htonl((u_int32_t)param); /* * icmp6_reflect() is designed to be in the input path. * icmp6_error() can be called from both input and outut path, * and if we are in output path rcvif could contain bogus value. * clear m->m_pkthdr.rcvif for safety, we should have enough scope * information in ip header (nip6). */ m->m_pkthdr.rcvif = NULL; icmp6stat.icp6s_outhist[type]++; icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ return; freeit: /* * If we can't tell wheter or not we can generate ICMP6, free it. */ m_freem(m); } /* * Process a received ICMP6 message. */ int icmp6_input(mp, offp, proto) struct mbuf **mp; int *offp, proto; { struct mbuf *m = *mp, *n; struct ip6_hdr *ip6, *nip6; struct icmp6_hdr *icmp6, *nicmp6; int off = *offp; int icmp6len = m->m_pkthdr.len - *offp; int code, sum, noff; icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE); /* m might change if M_LOOP. So, call mtod after this */ #endif /* * Locate icmp6 structure in mbuf, and check * that not corrupted and of at least minimum length */ ip6 = mtod(m, struct ip6_hdr *); if (icmp6len < sizeof(struct icmp6_hdr)) { icmp6stat.icp6s_tooshort++; icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); goto freeit; } /* * calculate the checksum */ #ifndef PULLDOWN_TEST icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); #else IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); if (icmp6 == NULL) { icmp6stat.icp6s_tooshort++; icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); return IPPROTO_DONE; } #endif code = icmp6->icmp6_code; if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { nd6log((LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n", icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src))); icmp6stat.icp6s_checksum++; icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); goto freeit; } #if defined(NFAITH) && 0 < NFAITH if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_type == IFT_FAITH) { /* * Deliver very specific ICMP6 type only. * This is important to deilver TOOBIG. Otherwise PMTUD * will not work. */ switch (icmp6->icmp6_type) { case ICMP6_DST_UNREACH: case ICMP6_PACKET_TOO_BIG: case ICMP6_TIME_EXCEEDED: break; default: goto freeit; } } #endif icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; switch (icmp6->icmp6_type) { case ICMP6_DST_UNREACH: icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach); switch (code) { case ICMP6_DST_UNREACH_NOROUTE: code = PRC_UNREACH_NET; break; case ICMP6_DST_UNREACH_ADMIN: icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib); code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ break; case ICMP6_DST_UNREACH_ADDR: code = PRC_HOSTDEAD; break; #ifdef COMPAT_RFC1885 case ICMP6_DST_UNREACH_NOTNEIGHBOR: code = PRC_UNREACH_SRCFAIL; break; #else case ICMP6_DST_UNREACH_BEYONDSCOPE: /* I mean "source address was incorrect." */ code = PRC_PARAMPROB; break; #endif case ICMP6_DST_UNREACH_NOPORT: code = PRC_UNREACH_PORT; break; default: goto badcode; } goto deliver; break; case ICMP6_PACKET_TOO_BIG: icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig); if (code != 0) goto badcode; code = PRC_MSGSIZE; /* * Updating the path MTU will be done after examining * intermediate extension headers. */ goto deliver; break; case ICMP6_TIME_EXCEEDED: icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); switch (code) { case ICMP6_TIME_EXCEED_TRANSIT: code = PRC_TIMXCEED_INTRANS; break; case ICMP6_TIME_EXCEED_REASSEMBLY: code = PRC_TIMXCEED_REASS; break; default: goto badcode; } goto deliver; break; case ICMP6_PARAM_PROB: icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); switch (code) { case ICMP6_PARAMPROB_NEXTHEADER: code = PRC_UNREACH_PROTOCOL; break; case ICMP6_PARAMPROB_HEADER: case ICMP6_PARAMPROB_OPTION: code = PRC_PARAMPROB; break; default: goto badcode; } goto deliver; break; case ICMP6_ECHO_REQUEST: icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); if (code != 0) goto badcode; /* * Copy mbuf to send to two data paths: userland socket(s), * and to the querier (echo reply). * m: a copy for socket, n: a copy for querier */ if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { /* Give up local */ n = m; m = NULL; goto deliverecho; } /* * If the first mbuf is shared, or the first mbuf is too short, * copy the first part of the data into a fresh mbuf. * Otherwise, we will wrongly overwrite both copies. */ if ((n->m_flags & M_EXT) != 0 || n->m_len < off + sizeof(struct icmp6_hdr)) { struct mbuf *n0 = n; const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); /* * Prepare an internal mbuf. m_pullup() doesn't * always copy the length we specified. */ if (maxlen >= MCLBYTES) { /* Give up remote */ m_freem(n0); break; } MGETHDR(n, M_DONTWAIT, n0->m_type); if (n && maxlen >= MHLEN) { MCLGET(n, M_DONTWAIT); if ((n->m_flags & M_EXT) == 0) { m_free(n); n = NULL; } } if (n == NULL) { /* Give up local */ m_freem(n0); n = m; m = NULL; goto deliverecho; } M_MOVE_PKTHDR(n, n0); /* * Copy IPv6 and ICMPv6 only. */ nip6 = mtod(n, struct ip6_hdr *); bcopy(ip6, nip6, sizeof(struct ip6_hdr)); nicmp6 = (struct icmp6_hdr *)(nip6 + 1); bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); noff = sizeof(struct ip6_hdr); n->m_len = noff + sizeof(struct icmp6_hdr); /* * Adjust mbuf. ip6_plen will be adjusted in * ip6_output(). * n->m_pkthdr.len == n0->m_pkthdr.len at this point. */ n->m_pkthdr.len += noff + sizeof(struct icmp6_hdr); n->m_pkthdr.len -= (off + sizeof(struct icmp6_hdr)); m_adj(n0, off + sizeof(struct icmp6_hdr)); n->m_next = n0; } else { deliverecho: nip6 = mtod(n, struct ip6_hdr *); nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off); noff = off; } nicmp6->icmp6_type = ICMP6_ECHO_REPLY; nicmp6->icmp6_code = 0; if (n) { icmp6stat.icp6s_reflect++; icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; icmp6_reflect(n, noff); } if (!m) goto freeit; break; case ICMP6_ECHO_REPLY: icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); if (code != 0) goto badcode; break; case MLD6_LISTENER_QUERY: case MLD6_LISTENER_REPORT: if (icmp6len < sizeof(struct mld6_hdr)) goto badlen; if (icmp6->icmp6_type == MLD6_LISTENER_QUERY) /* XXX: ugly... */ icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); else icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { /* give up local */ mld6_input(m, off); m = NULL; goto freeit; } mld6_input(n, off); /* m stays. */ break; case MLD6_LISTENER_DONE: icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); if (icmp6len < sizeof(struct mld6_hdr)) /* necessary? */ goto badlen; break; /* nothing to be done in kernel */ case MLD6_MTRACE_RESP: case MLD6_MTRACE: /* XXX: these two are experimental. not officially defined. */ /* XXX: per-interface statistics? */ break; /* just pass it to applications */ case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ { enum { WRU, FQDN } mode; if (!icmp6_nodeinfo) break; if (icmp6len == sizeof(struct icmp6_hdr) + 4) mode = WRU; else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) mode = FQDN; else goto badlen; if (mode == FQDN) { #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), IPPROTO_DONE); #endif n = m_copym(m, 0, M_COPYALL, M_DONTWAIT); if (n) n = ni6_input(n, off); /* XXX meaningless if n == NULL */ noff = sizeof(struct ip6_hdr); } else { u_char *p; int maxlen, maxhlen; if ((icmp6_nodeinfo & 1) == 0) break; if (code != 0) goto badcode; maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; if (maxlen >= MCLBYTES) { /* Give up remote */ break; } MGETHDR(n, M_DONTWAIT, m->m_type); if (n && maxlen > MHLEN) { MCLGET(n, M_DONTWAIT); if ((n->m_flags & M_EXT) == 0) { m_free(n); n = NULL; } } if (n == NULL) { /* Give up remote */ break; } n->m_pkthdr.rcvif = NULL; n->m_len = 0; maxhlen = M_TRAILINGSPACE(n) - maxlen; if (maxhlen > hostnamelen) maxhlen = hostnamelen; /* * Copy IPv6 and ICMPv6 only. */ nip6 = mtod(n, struct ip6_hdr *); bcopy(ip6, nip6, sizeof(struct ip6_hdr)); nicmp6 = (struct icmp6_hdr *)(nip6 + 1); bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); p = (u_char *)(nicmp6 + 1); bzero(p, 4); bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ noff = sizeof(struct ip6_hdr); M_DUP_PKTHDR(n, m); /* just for rcvif */ n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 4 + maxhlen; nicmp6->icmp6_type = ICMP6_WRUREPLY; nicmp6->icmp6_code = 0; } #undef hostnamelen if (n) { icmp6stat.icp6s_reflect++; icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; icmp6_reflect(n, noff); } break; } case ICMP6_WRUREPLY: if (code != 0) goto badcode; break; case ND_ROUTER_SOLICIT: icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); if (code != 0) goto badcode; if (icmp6len < sizeof(struct nd_router_solicit)) goto badlen; if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { /* give up local */ nd6_rs_input(m, off, icmp6len); m = NULL; goto freeit; } nd6_rs_input(n, off, icmp6len); /* m stays. */ break; case ND_ROUTER_ADVERT: icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); if (code != 0) goto badcode; if (icmp6len < sizeof(struct nd_router_advert)) goto badlen; if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { /* give up local */ nd6_ra_input(m, off, icmp6len); m = NULL; goto freeit; } nd6_ra_input(n, off, icmp6len); /* m stays. */ break; case ND_NEIGHBOR_SOLICIT: icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); if (code != 0) goto badcode; if (icmp6len < sizeof(struct nd_neighbor_solicit)) goto badlen; if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { /* give up local */ nd6_ns_input(m, off, icmp6len); m = NULL; goto freeit; } nd6_ns_input(n, off, icmp6len); /* m stays. */ break; case ND_NEIGHBOR_ADVERT: icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); if (code != 0) goto badcode; if (icmp6len < sizeof(struct nd_neighbor_advert)) goto badlen; if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { /* give up local */ nd6_na_input(m, off, icmp6len); m = NULL; goto freeit; } nd6_na_input(n, off, icmp6len); /* m stays. */ break; case ND_REDIRECT: icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); if (code != 0) goto badcode; if (icmp6len < sizeof(struct nd_redirect)) goto badlen; if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { /* give up local */ icmp6_redirect_input(m, off); m = NULL; goto freeit; } icmp6_redirect_input(n, off); /* m stays. */ break; case ICMP6_ROUTER_RENUMBERING: if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && code != ICMP6_ROUTER_RENUMBERING_RESULT) goto badcode; if (icmp6len < sizeof(struct icmp6_router_renum)) goto badlen; break; default: nd6log((LOG_DEBUG, "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0)); if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { /* ICMPv6 error: MUST deliver it by spec... */ code = PRC_NCMDS; /* deliver */ } else { /* ICMPv6 informational: MUST not deliver */ break; } deliver: if (icmp6_notify_error(m, off, icmp6len, code)) { /* In this case, m should've been freed. */ return (IPPROTO_DONE); } break; badcode: icmp6stat.icp6s_badcode++; break; badlen: icmp6stat.icp6s_badlen++; break; } /* deliver the packet to appropriate sockets */ icmp6_rip6_input(&m, *offp); return IPPROTO_DONE; freeit: m_freem(m); return IPPROTO_DONE; } static int icmp6_notify_error(m, off, icmp6len, code) struct mbuf *m; int off, icmp6len; { struct icmp6_hdr *icmp6; struct ip6_hdr *eip6; u_int32_t notifymtu; struct sockaddr_in6 icmp6src, icmp6dst; if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { icmp6stat.icp6s_tooshort++; goto freeit; } #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1); icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); #else IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6) + sizeof(struct ip6_hdr)); if (icmp6 == NULL) { icmp6stat.icp6s_tooshort++; return (-1); } #endif eip6 = (struct ip6_hdr *)(icmp6 + 1); /* Detect the upper level protocol */ { void (*ctlfunc)(int, struct sockaddr *, void *); u_int8_t nxt = eip6->ip6_nxt; int eoff = off + sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr); struct ip6ctlparam ip6cp; struct in6_addr *finaldst = NULL; int icmp6type = icmp6->icmp6_type; struct ip6_frag *fh; struct ip6_rthdr *rth; struct ip6_rthdr0 *rth0; int rthlen; while (1) { /* XXX: should avoid infinite loop explicitly? */ struct ip6_ext *eh; switch (nxt) { case IPPROTO_HOPOPTS: case IPPROTO_DSTOPTS: case IPPROTO_AH: #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(struct ip6_ext), -1); eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff); #else IP6_EXTHDR_GET(eh, struct ip6_ext *, m, eoff, sizeof(*eh)); if (eh == NULL) { icmp6stat.icp6s_tooshort++; return (-1); } #endif if (nxt == IPPROTO_AH) eoff += (eh->ip6e_len + 2) << 2; else eoff += (eh->ip6e_len + 1) << 3; nxt = eh->ip6e_nxt; break; case IPPROTO_ROUTING: /* * When the erroneous packet contains a * routing header, we should examine the * header to determine the final destination. * Otherwise, we can't properly update * information that depends on the final * destination (e.g. path MTU). */ #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1); rth = (struct ip6_rthdr *)(mtod(m, caddr_t) + eoff); #else IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, eoff, sizeof(*rth)); if (rth == NULL) { icmp6stat.icp6s_tooshort++; return (-1); } #endif rthlen = (rth->ip6r_len + 1) << 3; /* * XXX: currently there is no * officially defined type other * than type-0. * Note that if the segment left field * is 0, all intermediate hops must * have been passed. */ if (rth->ip6r_segleft && rth->ip6r_type == IPV6_RTHDR_TYPE_0) { int hops; #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1); rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff); #else IP6_EXTHDR_GET(rth0, struct ip6_rthdr0 *, m, eoff, rthlen); if (rth0 == NULL) { icmp6stat.icp6s_tooshort++; return (-1); } #endif /* just ignore a bogus header */ if ((rth0->ip6r0_len % 2) == 0 && (hops = rth0->ip6r0_len/2)) finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); } eoff += rthlen; nxt = rth->ip6r_nxt; break; case IPPROTO_FRAGMENT: #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(struct ip6_frag), -1); fh = (struct ip6_frag *)(mtod(m, caddr_t) + eoff); #else IP6_EXTHDR_GET(fh, struct ip6_frag *, m, eoff, sizeof(*fh)); if (fh == NULL) { icmp6stat.icp6s_tooshort++; return (-1); } #endif /* * Data after a fragment header is meaningless * unless it is the first fragment, but * we'll go to the notify label for path MTU * discovery. */ if (fh->ip6f_offlg & IP6F_OFF_MASK) goto notify; eoff += sizeof(struct ip6_frag); nxt = fh->ip6f_nxt; break; default: /* * This case includes ESP and the No Next * Header. In such cases going to the notify * label does not have any meaning * (i.e. ctlfunc will be NULL), but we go * anyway since we might have to update * path MTU information. */ goto notify; } } notify: #ifndef PULLDOWN_TEST icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); #else IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6) + sizeof(struct ip6_hdr)); if (icmp6 == NULL) { icmp6stat.icp6s_tooshort++; return (-1); } #endif eip6 = (struct ip6_hdr *)(icmp6 + 1); bzero(&icmp6dst, sizeof(icmp6dst)); icmp6dst.sin6_len = sizeof(struct sockaddr_in6); icmp6dst.sin6_family = AF_INET6; if (finaldst == NULL) icmp6dst.sin6_addr = eip6->ip6_dst; else icmp6dst.sin6_addr = *finaldst; icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, &icmp6dst.sin6_addr); #ifndef SCOPEDROUTING if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst, NULL, NULL)) { /* should be impossbile */ nd6log((LOG_DEBUG, "icmp6_notify_error: in6_embedscope failed\n")); goto freeit; } #endif /* * retrieve parameters from the inner IPv6 header, and convert * them into sockaddr structures. */ bzero(&icmp6src, sizeof(icmp6src)); icmp6src.sin6_len = sizeof(struct sockaddr_in6); icmp6src.sin6_family = AF_INET6; icmp6src.sin6_addr = eip6->ip6_src; icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, &icmp6src.sin6_addr); #ifndef SCOPEDROUTING if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src, NULL, NULL)) { /* should be impossbile */ nd6log((LOG_DEBUG, "icmp6_notify_error: in6_embedscope failed\n")); goto freeit; } #endif icmp6src.sin6_flowinfo = (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); if (finaldst == NULL) finaldst = &eip6->ip6_dst; ip6cp.ip6c_m = m; ip6cp.ip6c_icmp6 = icmp6; ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); ip6cp.ip6c_off = eoff; ip6cp.ip6c_finaldst = finaldst; ip6cp.ip6c_src = &icmp6src; ip6cp.ip6c_nxt = nxt; if (icmp6type == ICMP6_PACKET_TOO_BIG) { notifymtu = ntohl(icmp6->icmp6_mtu); ip6cp.ip6c_cmdarg = (void *)¬ifymtu; } ctlfunc = (void (*)(int, struct sockaddr *, void *)) (inet6sw[ip6_protox[nxt]].pr_ctlinput); if (ctlfunc) { (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, &ip6cp); } } return (0); freeit: m_freem(m); return (-1); } void icmp6_mtudisc_update(ip6cp, validated) struct ip6ctlparam *ip6cp; int validated; { unsigned long rtcount; struct icmp6_mtudisc_callback *mc; struct in6_addr *dst = ip6cp->ip6c_finaldst; struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ u_int mtu = ntohl(icmp6->icmp6_mtu); struct rtentry *rt = NULL; struct sockaddr_in6 sin6; /* * allow non-validated cases if memory is plenty, to make traffic * from non-connected pcb happy. */ rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); if (validated) { if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) return; else if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) { /* * XXX nuke a victim, install the new one. */ } } else { if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) return; } bzero(&sin6, sizeof(sin6)); sin6.sin6_family = PF_INET6; sin6.sin6_len = sizeof(struct sockaddr_in6); sin6.sin6_addr = *dst; /* XXX normally, this won't happen */ if (IN6_IS_ADDR_LINKLOCAL(dst)) { sin6.sin6_addr.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index); } /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ rt = icmp6_mtudisc_clone((struct sockaddr *)&sin6); if (rt && (rt->rt_flags & RTF_HOST) && !(rt->rt_rmx.rmx_locks & RTV_MTU) && (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { if (mtu < IN6_LINKMTU(rt->rt_ifp)) { icmp6stat.icp6s_pmtuchg++; rt->rt_rmx.rmx_mtu = mtu; } } if (rt) { /* XXX: need braces to avoid conflict with else in RTFREE. */ RTFREE(rt); } /* * Notify protocols that the MTU for this destination * has changed. */ for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; mc = LIST_NEXT(mc, mc_list)) (*mc->mc_func)(&sin6.sin6_addr); } /* * Process a Node Information Query packet, based on * draft-ietf-ipngwg-icmp-name-lookups-07. * * Spec incompatibilities: * - IPv6 Subject address handling * - IPv4 Subject address handling support missing * - Proxy reply (answer even if it's not for me) * - joins NI group address at in6_ifattach() time only, does not cope * with hostname changes by sethostname(3) */ #ifndef offsetof /* XXX */ #define offsetof(type, member) ((size_t)(&((type *)0)->member)) #endif static struct mbuf * ni6_input(m, off) struct mbuf *m; int off; { struct icmp6_nodeinfo *ni6, *nni6; struct mbuf *n = NULL; u_int16_t qtype; int subjlen; int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); struct ni_reply_fqdn *fqdn; int addrs; /* for NI_QTYPE_NODEADDR */ struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */ struct ip6_hdr *ip6; int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ char *subj = NULL; ip6 = mtod(m, struct ip6_hdr *); #ifndef PULLDOWN_TEST ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); #else IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); if (ni6 == NULL) { /* m is already reclaimed */ return NULL; } #endif /* * Validate IPv6 destination address. * * The Responder must discard the Query without further processing * unless it is one of the Responder's unicast or anycast addresses, or * a link-local scope multicast address which the Responder has joined. * [icmp-name-lookups-07, Section 4.] */ bzero(&sin6, sizeof(sin6)); sin6.sin6_family = AF_INET6; sin6.sin6_len = sizeof(struct sockaddr_in6); bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); /* XXX scopeid */ if (ifa_ifwithaddr((struct sockaddr *)&sin6)) ; /* unicast/anycast, fine */ else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) ; /* link-local multicast, fine */ else goto bad; /* validate query Subject field. */ qtype = ntohs(ni6->ni_qtype); subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); switch (qtype) { case NI_QTYPE_NOOP: case NI_QTYPE_SUPTYPES: /* 07 draft */ if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) break; /* FALLTHROUGH */ case NI_QTYPE_FQDN: case NI_QTYPE_NODEADDR: switch (ni6->ni_code) { case ICMP6_NI_SUBJ_IPV6: #if ICMP6_NI_SUBJ_IPV6 != 0 case 0: #endif /* * backward compatibility - try to accept 03 draft * format, where no Subject is present. */ if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && subjlen == 0) { oldfqdn++; break; } #if ICMP6_NI_SUBJ_IPV6 != 0 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) goto bad; #endif if (subjlen != sizeof(sin6.sin6_addr)) goto bad; /* * Validate Subject address. * * Not sure what exactly "address belongs to the node" * means in the spec, is it just unicast, or what? * * At this moment we consider Subject address as * "belong to the node" if the Subject address equals * to the IPv6 destination address; validation for * IPv6 destination address should have done enough * check for us. * * We do not do proxy at this moment. */ /* m_pulldown instead of copy? */ m_copydata(m, off + sizeof(struct icmp6_nodeinfo), subjlen, (caddr_t)&sin6.sin6_addr); /* XXX kame scope hack */ if (IN6_IS_SCOPE_LINKLOCAL(&sin6.sin6_addr)) { if ((m->m_flags & M_PKTHDR) != 0 && m->m_pkthdr.rcvif) { sin6.sin6_addr.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index); } } subj = (char *)&sin6; if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &sin6.sin6_addr)) break; /* * XXX if we are to allow other cases, we should really * be careful about scope here. * basically, we should disallow queries toward IPv6 * destination X with subject Y, if scope(X) > scope(Y). * if we allow scope(X) > scope(Y), it will result in * information leakage across scope boundary. */ goto bad; case ICMP6_NI_SUBJ_FQDN: /* * Validate Subject name with gethostname(3). * * The behavior may need some debate, since: * - we are not sure if the node has FQDN as * hostname (returned by gethostname(3)). * - the code does wildcard match for truncated names. * however, we are not sure if we want to perform * wildcard match, if gethostname(3) side has * truncated hostname. */ n = ni6_nametodns(hostname, hostnamelen, 0); if (!n || n->m_next || n->m_len == 0) goto bad; IP6_EXTHDR_GET(subj, char *, m, off + sizeof(struct icmp6_nodeinfo), subjlen); if (subj == NULL) goto bad; if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), n->m_len)) { goto bad; } m_freem(n); n = NULL; break; case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ default: goto bad; } break; } /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ switch (qtype) { case NI_QTYPE_FQDN: if ((icmp6_nodeinfo & 1) == 0) goto bad; break; case NI_QTYPE_NODEADDR: if ((icmp6_nodeinfo & 2) == 0) goto bad; break; } /* guess reply length */ switch (qtype) { case NI_QTYPE_NOOP: break; /* no reply data */ case NI_QTYPE_SUPTYPES: replylen += sizeof(u_int32_t); break; case NI_QTYPE_FQDN: /* XXX will append an mbuf */ replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); break; case NI_QTYPE_NODEADDR: addrs = ni6_addrs(ni6, m, &ifp, subj); if ((replylen += addrs * (sizeof(struct in6_addr) + sizeof(u_int32_t))) > MCLBYTES) replylen = MCLBYTES; /* XXX: will truncate pkt later */ break; default: /* * XXX: We must return a reply with the ICMP6 code * `unknown Qtype' in this case. However we regard the case * as an FQDN query for backward compatibility. * Older versions set a random value to this field, * so it rarely varies in the defined qtypes. * But the mechanism is not reliable... * maybe we should obsolete older versions. */ qtype = NI_QTYPE_FQDN; /* XXX will append an mbuf */ replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); oldfqdn++; break; } /* allocate an mbuf to reply. */ MGETHDR(n, M_DONTWAIT, m->m_type); if (n == NULL) { m_freem(m); return (NULL); } M_DUP_PKTHDR(n, m); /* just for rcvif */ if (replylen > MHLEN) { if (replylen > MCLBYTES) { /* * XXX: should we try to allocate more? But MCLBYTES * is probably much larger than IPV6_MMTU... */ goto bad; } MCLGET(n, M_DONTWAIT); if ((n->m_flags & M_EXT) == 0) { goto bad; } } n->m_pkthdr.len = n->m_len = replylen; /* copy mbuf header and IPv6 + Node Information base headers */ bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); /* qtype dependent procedure */ switch (qtype) { case NI_QTYPE_NOOP: nni6->ni_code = ICMP6_NI_SUCCESS; nni6->ni_flags = 0; break; case NI_QTYPE_SUPTYPES: { u_int32_t v; nni6->ni_code = ICMP6_NI_SUCCESS; nni6->ni_flags = htons(0x0000); /* raw bitmap */ /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ v = (u_int32_t)htonl(0x0000000f); bcopy(&v, nni6 + 1, sizeof(u_int32_t)); break; } case NI_QTYPE_FQDN: nni6->ni_code = ICMP6_NI_SUCCESS; fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo)); nni6->ni_flags = 0; /* XXX: meaningless TTL */ fqdn->ni_fqdn_ttl = 0; /* ditto. */ /* * XXX do we really have FQDN in variable "hostname"? */ n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); if (n->m_next == NULL) goto bad; /* XXX we assume that n->m_next is not a chain */ if (n->m_next->m_next != NULL) goto bad; n->m_pkthdr.len += n->m_next->m_len; break; case NI_QTYPE_NODEADDR: { int lenlim, copied; nni6->ni_code = ICMP6_NI_SUCCESS; n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); lenlim = M_TRAILINGSPACE(n); copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); /* XXX: reset mbuf length */ n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo) + copied; break; } default: break; /* XXX impossible! */ } nni6->ni_type = ICMP6_NI_REPLY; m_freem(m); return (n); bad: m_freem(m); if (n) m_freem(n); return (NULL); } #undef hostnamelen #define isupper(x) ('A' <= (x) && (x) <= 'Z') #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) #define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) /* * make a mbuf with DNS-encoded string. no compression support. * * XXX names with less than 2 dots (like "foo" or "foo.section") will be * treated as truncated name (two \0 at the end). this is a wild guess. */ static struct mbuf * ni6_nametodns(name, namelen, old) const char *name; int namelen; int old; /* return pascal string if non-zero */ { struct mbuf *m; char *cp, *ep; const char *p, *q; int i, len, nterm; if (old) len = namelen + 1; else len = MCLBYTES; /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ MGET(m, M_DONTWAIT, MT_DATA); if (m && len > MLEN) { MCLGET(m, M_DONTWAIT); if ((m->m_flags & M_EXT) == 0) goto fail; } if (!m) goto fail; m->m_next = NULL; if (old) { m->m_len = len; *mtod(m, char *) = namelen; bcopy(name, mtod(m, char *) + 1, namelen); return m; } else { m->m_len = 0; cp = mtod(m, char *); ep = mtod(m, char *) + M_TRAILINGSPACE(m); /* if not certain about my name, return empty buffer */ if (namelen == 0) return m; /* * guess if it looks like shortened hostname, or FQDN. * shortened hostname needs two trailing "\0". */ i = 0; for (p = name; p < name + namelen; p++) { if (*p && *p == '.') i++; } if (i < 2) nterm = 2; else nterm = 1; p = name; while (cp < ep && p < name + namelen) { i = 0; for (q = p; q < name + namelen && *q && *q != '.'; q++) i++; /* result does not fit into mbuf */ if (cp + i + 1 >= ep) goto fail; /* * DNS label length restriction, RFC1035 page 8. * "i == 0" case is included here to avoid returning * 0-length label on "foo..bar". */ if (i <= 0 || i >= 64) goto fail; *cp++ = i; if (!isalpha(p[0]) || !isalnum(p[i - 1])) goto fail; while (i > 0) { if (!isalnum(*p) && *p != '-') goto fail; if (isupper(*p)) { *cp++ = tolower(*p); p++; } else *cp++ = *p++; i--; } p = q; if (p < name + namelen && *p == '.') p++; } /* termination */ if (cp + nterm >= ep) goto fail; while (nterm-- > 0) *cp++ = '\0'; m->m_len = cp - mtod(m, char *); return m; } panic("should not reach here"); /* NOTREACHED */ fail: if (m) m_freem(m); return NULL; } /* * check if two DNS-encoded string matches. takes care of truncated * form (with \0\0 at the end). no compression support. * XXX upper/lowercase match (see RFC2065) */ static int ni6_dnsmatch(a, alen, b, blen) const char *a; int alen; const char *b; int blen; { const char *a0, *b0; int l; /* simplest case - need validation? */ if (alen == blen && bcmp(a, b, alen) == 0) return 1; a0 = a; b0 = b; /* termination is mandatory */ if (alen < 2 || blen < 2) return 0; if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') return 0; alen--; blen--; while (a - a0 < alen && b - b0 < blen) { if (a - a0 + 1 > alen || b - b0 + 1 > blen) return 0; if ((signed char)a[0] < 0 || (signed char)b[0] < 0) return 0; /* we don't support compression yet */ if (a[0] >= 64 || b[0] >= 64) return 0; /* truncated case */ if (a[0] == 0 && a - a0 == alen - 1) return 1; if (b[0] == 0 && b - b0 == blen - 1) return 1; if (a[0] == 0 || b[0] == 0) return 0; if (a[0] != b[0]) return 0; l = a[0]; if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) return 0; if (bcmp(a + 1, b + 1, l) != 0) return 0; a += 1 + l; b += 1 + l; } if (a - a0 == alen && b - b0 == blen) return 1; else return 0; } /* * calculate the number of addresses to be returned in the node info reply. */ static int ni6_addrs(ni6, m, ifpp, subj) struct icmp6_nodeinfo *ni6; struct mbuf *m; struct ifnet **ifpp; char *subj; { struct ifnet *ifp; struct in6_ifaddr *ifa6; struct ifaddr *ifa; struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ int addrs = 0, addrsofif, iffound = 0; int niflags = ni6->ni_flags; if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { switch (ni6->ni_code) { case ICMP6_NI_SUBJ_IPV6: if (subj == NULL) /* must be impossible... */ return (0); subj_ip6 = (struct sockaddr_in6 *)subj; break; default: /* * XXX: we only support IPv6 subject address for * this Qtype. */ return (0); } } for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { addrsofif = 0; for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; ifa6 = (struct in6_ifaddr *)ifa; if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, &ifa6->ia_addr.sin6_addr)) iffound = 1; /* * IPv4-mapped addresses can only be returned by a * Node Information proxy, since they represent * addresses of IPv4-only nodes, which perforce do * not implement this protocol. * [icmp-name-lookups-07, Section 5.4] * So we don't support NI_NODEADDR_FLAG_COMPAT in * this function at this moment. */ /* What do we have to do about ::1? */ switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { case IPV6_ADDR_SCOPE_LINKLOCAL: if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) continue; break; case IPV6_ADDR_SCOPE_SITELOCAL: if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) continue; break; case IPV6_ADDR_SCOPE_GLOBAL: if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) continue; break; default: continue; } /* * check if anycast is okay. * XXX: just experimental. not in the spec. */ if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) continue; /* we need only unicast addresses */ addrsofif++; /* count the address */ } if (iffound) { *ifpp = ifp; return (addrsofif); } addrs += addrsofif; } return (addrs); } static int ni6_store_addrs(ni6, nni6, ifp0, resid) struct icmp6_nodeinfo *ni6, *nni6; struct ifnet *ifp0; int resid; { struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); struct in6_ifaddr *ifa6; struct ifaddr *ifa; struct ifnet *ifp_dep = NULL; int copied = 0, allow_deprecated = 0; u_char *cp = (u_char *)(nni6 + 1); int niflags = ni6->ni_flags; u_int32_t ltime; long time_second = time.tv_sec; if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) return (0); /* needless to copy */ again: for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) { for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; ifa6 = (struct in6_ifaddr *)ifa; if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && allow_deprecated == 0) { /* * prefererred address should be put before * deprecated addresses. */ /* record the interface for later search */ if (ifp_dep == NULL) ifp_dep = ifp; continue; } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && allow_deprecated != 0) continue; /* we now collect deprecated addrs */ /* What do we have to do about ::1? */ switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { case IPV6_ADDR_SCOPE_LINKLOCAL: if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) continue; break; case IPV6_ADDR_SCOPE_SITELOCAL: if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) continue; break; case IPV6_ADDR_SCOPE_GLOBAL: if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) continue; break; default: continue; } /* * check if anycast is okay. * XXX: just experimental. not in the spec. */ if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) continue; /* now we can copy the address */ if (resid < sizeof(struct in6_addr) + sizeof(u_int32_t)) { /* * We give up much more copy. * Set the truncate flag and return. */ nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; return (copied); } /* * Set the TTL of the address. * The TTL value should be one of the following * according to the specification: * * 1. The remaining lifetime of a DHCP lease on the * address, or * 2. The remaining Valid Lifetime of a prefix from * which the address was derived through Stateless * Autoconfiguration. * * Note that we currently do not support stateful * address configuration by DHCPv6, so the former * case can't happen. * * TTL must be 2^31 > TTL >= 0. */ if (ifa6->ia6_lifetime.ia6t_expire == 0) ltime = ND6_INFINITE_LIFETIME; else { if (ifa6->ia6_lifetime.ia6t_expire > time_second) ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second); else ltime = 0; } bcopy(<ime, cp, sizeof(u_int32_t)); cp += sizeof(u_int32_t); /* copy the address itself */ bcopy(&ifa6->ia_addr.sin6_addr, cp, sizeof(struct in6_addr)); /* XXX: KAME link-local hack; remove ifindex */ if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) ((struct in6_addr *)cp)->s6_addr16[1] = 0; cp += sizeof(struct in6_addr); resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); } if (ifp0) /* we need search only on the specified IF */ break; } if (allow_deprecated == 0 && ifp_dep != NULL) { ifp = ifp_dep; allow_deprecated = 1; goto again; } return (copied); } /* * XXX almost dup'ed code with rip6_input. */ static int icmp6_rip6_input(mp, off) struct mbuf **mp; int off; { struct mbuf *m = *mp; struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); struct in6pcb *in6p; struct in6pcb *last = NULL; struct sockaddr_in6 rip6src; struct icmp6_hdr *icmp6; struct mbuf *opts = NULL; #ifndef PULLDOWN_TEST /* this is assumed to be safe. */ icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); #else IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); if (icmp6 == NULL) { /* m is already reclaimed */ return IPPROTO_DONE; } #endif bzero(&rip6src, sizeof(rip6src)); rip6src.sin6_len = sizeof(struct sockaddr_in6); rip6src.sin6_family = AF_INET6; /* KAME hack: recover scopeid */ (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif); for (in6p = rawin6pcbtable.inpt_queue.cqh_first; in6p != (struct inpcb *)&rawin6pcbtable.inpt_queue; in6p = in6p->inp_queue.cqe_next) { if (!(in6p->in6p_flags & INP_IPV6)) continue; if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) continue; if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) continue; if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) continue; if (in6p->in6p_icmp6filt && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, in6p->in6p_icmp6filt)) continue; if (last) { struct mbuf *n; if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { if (last->in6p_flags & IN6P_CONTROLOPTS) ip6_savecontrol(last, &opts, ip6, n); /* strip intermediate headers */ m_adj(n, off); if (sbappendaddr(&last->in6p_socket->so_rcv, (struct sockaddr *)&rip6src, n, opts) == 0) { /* should notify about lost packet */ m_freem(n); if (opts) m_freem(opts); } else sorwakeup(last->in6p_socket); opts = NULL; } } last = in6p; } if (last) { if (last->in6p_flags & IN6P_CONTROLOPTS) ip6_savecontrol(last, &opts, ip6, m); /* strip intermediate headers */ m_adj(m, off); if (sbappendaddr(&last->in6p_socket->so_rcv, (struct sockaddr *)&rip6src, m, opts) == 0) { m_freem(m); if (opts) m_freem(opts); } else sorwakeup(last->in6p_socket); } else { m_freem(m); ip6stat.ip6s_delivered--; } return IPPROTO_DONE; } /* * Reflect the ip6 packet back to the source. * OFF points to the icmp6 header, counted from the top of the mbuf. * * Note: RFC 1885 required that an echo reply should be truncated if it * did not fit in with (return) path MTU, and KAME code supported the * behavior. However, as a clarification after the RFC, this limitation * was removed in a revised version of the spec, RFC 2463. We had kept the * old behavior, with a (non-default) ifdef block, while the new version of * the spec was an internet-draft status, and even after the new RFC was * published. But it would rather make sense to clean the obsoleted part * up, and to make the code simpler at this stage. */ void icmp6_reflect(m, off) struct mbuf *m; size_t off; { struct ip6_hdr *ip6; struct icmp6_hdr *icmp6; struct in6_ifaddr *ia; struct in6_addr t, *src = 0; int plen; int type, code; struct ifnet *outif = NULL; struct sockaddr_in6 sa6_src, sa6_dst; /* too short to reflect */ if (off < sizeof(struct ip6_hdr)) { nd6log((LOG_DEBUG, "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", (u_long)off, (u_long)sizeof(struct ip6_hdr), __FILE__, __LINE__)); goto bad; } /* * If there are extra headers between IPv6 and ICMPv6, strip * off that header first. */ #ifdef DIAGNOSTIC if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) panic("assumption failed in icmp6_reflect"); #endif if (off > sizeof(struct ip6_hdr)) { size_t l; struct ip6_hdr nip6; l = off - sizeof(struct ip6_hdr); m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); m_adj(m, l); l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); if (m->m_len < l) { if ((m = m_pullup(m, l)) == NULL) return; } bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); } else /* off == sizeof(struct ip6_hdr) */ { size_t l; l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); if (m->m_len < l) { if ((m = m_pullup(m, l)) == NULL) return; } } plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); ip6 = mtod(m, struct ip6_hdr *); ip6->ip6_nxt = IPPROTO_ICMPV6; icmp6 = (struct icmp6_hdr *)(ip6 + 1); type = icmp6->icmp6_type; /* keep type for statistics */ code = icmp6->icmp6_code; /* ditto. */ t = ip6->ip6_dst; /* * ip6_input() drops a packet if its src is multicast. * So, the src is never multicast. */ ip6->ip6_dst = ip6->ip6_src; /* * XXX: make sure to embed scope zone information, using * already embedded IDs or the received interface (if any). * Note that rcvif may be NULL. * TODO: scoped routing case (XXX). */ bzero(&sa6_src, sizeof(sa6_src)); sa6_src.sin6_family = AF_INET6; sa6_src.sin6_len = sizeof(sa6_src); sa6_src.sin6_addr = ip6->ip6_dst; in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif); in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL); bzero(&sa6_dst, sizeof(sa6_dst)); sa6_dst.sin6_family = AF_INET6; sa6_dst.sin6_len = sizeof(sa6_dst); sa6_dst.sin6_addr = t; in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif); in6_embedscope(&t, &sa6_dst, NULL, NULL); /* * If the incoming packet was addressed directly to us (i.e. unicast), * use dst as the src for the reply. * The IN6_IFF_NOTREADY case would be VERY rare, but is possible * (for example) when we encounter an error while forwarding procedure * destined to a duplicated address of ours. */ for (ia = in6_ifaddr; ia; ia = ia->ia_next) if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { src = &t; break; } if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { /* * This is the case if the dst is our link-local address * and the sender is also ourselves. */ src = &t; } if (src == 0) { int e; struct route_in6 ro; /* * This case matches to multicasts, our anycast, or unicasts * that we do not own. Select a source address based on the * source address of the erroneous packet. */ bzero(&ro, sizeof(ro)); src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e); if (ro.ro_rt) { /* XXX: see comments in icmp6_mtudisc_update */ RTFREE(ro.ro_rt); /* XXX: we could use this */ } if (src == NULL) { nd6log((LOG_DEBUG, "icmp6_reflect: source can't be determined: " "dst=%s, error=%d\n", ip6_sprintf(&sa6_src.sin6_addr), e)); goto bad; } } ip6->ip6_src = *src; ip6->ip6_flow = 0; ip6->ip6_vfc &= ~IPV6_VERSION_MASK; ip6->ip6_vfc |= IPV6_VERSION; ip6->ip6_nxt = IPPROTO_ICMPV6; if (m->m_pkthdr.rcvif) { /* XXX: This may not be the outgoing interface */ ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim; } else ip6->ip6_hlim = ip6_defhlim; icmp6->icmp6_cksum = 0; icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), plen); /* * XXX option handling */ m->m_flags &= ~(M_BCAST|M_MCAST); /* * To avoid a "too big" situation at an intermediate router * and the path MTU discovery process, specify the IPV6_MINMTU flag. * Note that only echo and node information replies are affected, * since the length of ICMP6 errors is limited to the minimum MTU. */ if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, &outif) != 0 && outif) icmp6_ifstat_inc(outif, ifs6_out_error); if (outif) icmp6_ifoutstat_inc(outif, type, code); return; bad: m_freem(m); return; } void icmp6_fasttimo() { mld6_fasttimeo(); } static const char * icmp6_redirect_diag(src6, dst6, tgt6) struct in6_addr *src6; struct in6_addr *dst6; struct in6_addr *tgt6; { static char buf[1024]; snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); return buf; } void icmp6_redirect_input(m, off) struct mbuf *m; int off; { struct ifnet *ifp = m->m_pkthdr.rcvif; struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); struct nd_redirect *nd_rd; int icmp6len = ntohs(ip6->ip6_plen); char *lladdr = NULL; int lladdrlen = 0; u_char *redirhdr = NULL; int redirhdrlen = 0; struct rtentry *rt = NULL; int is_router; int is_onlink; struct in6_addr src6 = ip6->ip6_src; struct in6_addr redtgt6; struct in6_addr reddst6; union nd_opts ndopts; if (!ifp) return; /* XXX if we are router, we don't update route by icmp6 redirect */ if (ip6_forwarding) goto freeit; if (!icmp6_rediraccept) goto freeit; #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, icmp6len,); nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); #else IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); if (nd_rd == NULL) { icmp6stat.icp6s_tooshort++; return; } #endif redtgt6 = nd_rd->nd_rd_target; reddst6 = nd_rd->nd_rd_dst; if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) redtgt6.s6_addr16[1] = htons(ifp->if_index); if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) reddst6.s6_addr16[1] = htons(ifp->if_index); /* validation */ if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { nd6log((LOG_ERR, "ICMP6 redirect sent from %s rejected; " "must be from linklocal\n", ip6_sprintf(&src6))); goto bad; } if (ip6->ip6_hlim != 255) { nd6log((LOG_ERR, "ICMP6 redirect sent from %s rejected; " "hlim=%d (must be 255)\n", ip6_sprintf(&src6), ip6->ip6_hlim)); goto bad; } { /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ struct sockaddr_in6 sin6; struct in6_addr *gw6; bzero(&sin6, sizeof(sin6)); sin6.sin6_family = AF_INET6; sin6.sin6_len = sizeof(struct sockaddr_in6); bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); rt = rtalloc1((struct sockaddr *)&sin6, 0); if (rt) { if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6) { nd6log((LOG_ERR, "ICMP6 redirect rejected; no route " "with inet6 gateway found for redirect dst: %s\n", icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); RTFREE(rt); goto bad; } gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { nd6log((LOG_ERR, "ICMP6 redirect rejected; " "not equal to gw-for-src=%s (must be same): " "%s\n", ip6_sprintf(gw6), icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); RTFREE(rt); goto bad; } } else { nd6log((LOG_ERR, "ICMP6 redirect rejected; " "no route found for redirect dst: %s\n", icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); goto bad; } RTFREE(rt); rt = NULL; } if (IN6_IS_ADDR_MULTICAST(&reddst6)) { nd6log((LOG_ERR, "ICMP6 redirect rejected; " "redirect dst must be unicast: %s\n", icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); goto bad; } is_router = is_onlink = 0; if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) is_router = 1; /* router case */ if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) is_onlink = 1; /* on-link destination case */ if (!is_router && !is_onlink) { nd6log((LOG_ERR, "ICMP6 redirect rejected; " "neither router case nor onlink case: %s\n", icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); goto bad; } /* validation passed */ icmp6len -= sizeof(*nd_rd); nd6_option_init(nd_rd + 1, icmp6len, &ndopts); if (nd6_options(&ndopts) < 0) { nd6log((LOG_INFO, "icmp6_redirect_input: " "invalid ND option, rejected: %s\n", icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); /* nd6_options have incremented stats */ goto freeit; } if (ndopts.nd_opts_tgt_lladdr) { lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; } if (ndopts.nd_opts_rh) { redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ } if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { nd6log((LOG_INFO, "icmp6_redirect_input: lladdrlen mismatch for %s " "(if %d, icmp6 packet %d): %s\n", ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); goto bad; } /* RFC 2461 8.3 */ nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); if (!is_onlink) { /* better router case. perform rtredirect. */ /* perform rtredirect */ struct sockaddr_in6 sdst; struct sockaddr_in6 sgw; struct sockaddr_in6 ssrc; unsigned long rtcount; struct rtentry *newrt = NULL; /* * do not install redirect route, if the number of entries * is too much (> hiwat). note that, the node (= host) will * work just fine even if we do not install redirect route * (there will be additional hops, though). */ rtcount = rt_timer_count(icmp6_redirect_timeout_q); if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) return; else if (0 <= icmp6_redirect_lowat && rtcount > icmp6_redirect_lowat) { /* * XXX nuke a victim, install the new one. */ } bzero(&sdst, sizeof(sdst)); bzero(&sgw, sizeof(sgw)); bzero(&ssrc, sizeof(ssrc)); sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = sizeof(struct sockaddr_in6); bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, (struct sockaddr *)&ssrc, &newrt); if (newrt) { (void)rt_timer_add(newrt, icmp6_redirect_timeout, icmp6_redirect_timeout_q); rtfree(newrt); } } /* finally update cached route in each socket via pfctlinput */ { struct sockaddr_in6 sdst; bzero(&sdst, sizeof(sdst)); sdst.sin6_family = AF_INET6; sdst.sin6_len = sizeof(struct sockaddr_in6); bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); } freeit: m_freem(m); return; bad: icmp6stat.icp6s_badredirect++; m_freem(m); } void icmp6_redirect_output(m0, rt) struct mbuf *m0; struct rtentry *rt; { struct ifnet *ifp; /* my outgoing interface */ struct in6_addr *ifp_ll6; struct in6_addr *nexthop; struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ struct mbuf *m = NULL; /* newly allocated one */ struct ip6_hdr *ip6; /* m as struct ip6_hdr */ struct nd_redirect *nd_rd; size_t maxlen; u_char *p; struct sockaddr_in6 src_sa; icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); /* if we are not router, we don't send icmp6 redirect */ if (!ip6_forwarding || ip6_accept_rtadv) goto fail; /* sanity check */ if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) goto fail; /* * Address check: * the source address must identify a neighbor, and * the destination address must not be a multicast address * [RFC 2461, sec 8.2] */ sip6 = mtod(m0, struct ip6_hdr *); bzero(&src_sa, sizeof(src_sa)); src_sa.sin6_family = AF_INET6; src_sa.sin6_len = sizeof(src_sa); src_sa.sin6_addr = sip6->ip6_src; /* we don't currently use sin6_scope_id, but eventually use it */ src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) goto fail; if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) goto fail; /* what should we do here? */ /* rate limit */ if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) goto fail; /* * Since we are going to append up to 1280 bytes (= IPV6_MMTU), * we almost always ask for an mbuf cluster for simplicity. * (MHLEN < IPV6_MMTU is almost always true) */ #if IPV6_MMTU >= MCLBYTES # error assumption failed about IPV6_MMTU and MCLBYTES #endif MGETHDR(m, M_DONTWAIT, MT_HEADER); if (m && IPV6_MMTU >= MHLEN) MCLGET(m, M_DONTWAIT); if (!m) goto fail; m->m_pkthdr.rcvif = NULL; m->m_len = 0; maxlen = M_TRAILINGSPACE(m); maxlen = min(IPV6_MMTU, maxlen); /* just for safety */ if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { goto fail; } { /* get ip6 linklocal address for ifp(my outgoing interface). */ struct in6_ifaddr *ia; if ((ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY| IN6_IFF_ANYCAST)) == NULL) goto fail; ifp_ll6 = &ia->ia_addr.sin6_addr; } /* get ip6 linklocal address for the router. */ if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { struct sockaddr_in6 *sin6; sin6 = (struct sockaddr_in6 *)rt->rt_gateway; nexthop = &sin6->sin6_addr; if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) nexthop = NULL; } else nexthop = NULL; /* ip6 */ ip6 = mtod(m, struct ip6_hdr *); ip6->ip6_flow = 0; ip6->ip6_vfc &= ~IPV6_VERSION_MASK; ip6->ip6_vfc |= IPV6_VERSION; /* ip6->ip6_plen will be set later */ ip6->ip6_nxt = IPPROTO_ICMPV6; ip6->ip6_hlim = 255; /* ip6->ip6_src must be linklocal addr for my outgoing if. */ bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); /* ND Redirect */ nd_rd = (struct nd_redirect *)(ip6 + 1); nd_rd->nd_rd_type = ND_REDIRECT; nd_rd->nd_rd_code = 0; nd_rd->nd_rd_reserved = 0; if (rt->rt_flags & RTF_GATEWAY) { /* * nd_rd->nd_rd_target must be a link-local address in * better router cases. */ if (!nexthop) goto fail; bcopy(nexthop, &nd_rd->nd_rd_target, sizeof(nd_rd->nd_rd_target)); bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, sizeof(nd_rd->nd_rd_dst)); } else { /* make sure redtgt == reddst */ nexthop = &sip6->ip6_dst; bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, sizeof(nd_rd->nd_rd_target)); bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, sizeof(nd_rd->nd_rd_dst)); } p = (u_char *)(nd_rd + 1); { /* target lladdr option */ struct rtentry *rt_nexthop = NULL; int len; struct sockaddr_dl *sdl; struct nd_opt_hdr *nd_opt; char *lladdr; rt_nexthop = nd6_lookup(nexthop, 0, ifp); if (!rt_nexthop) goto nolladdropt; len = sizeof(*nd_opt) + ifp->if_addrlen; len = (len + 7) & ~7; /* round by 8 */ /* safety check */ if (len + (p - (u_char *)ip6) > maxlen) goto nolladdropt; if (!(rt_nexthop->rt_flags & RTF_GATEWAY) && (rt_nexthop->rt_flags & RTF_LLINFO) && (rt_nexthop->rt_gateway->sa_family == AF_LINK) && (sdl = (struct sockaddr_dl *)rt_nexthop->rt_gateway) && sdl->sdl_alen) { nd_opt = (struct nd_opt_hdr *)p; nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; nd_opt->nd_opt_len = len >> 3; lladdr = (char *)(nd_opt + 1); bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); p += len; } } nolladdropt:; m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; /* just to be safe */ if (p - (u_char *)ip6 > maxlen) goto noredhdropt; { /* redirected header option */ int len; struct nd_opt_rd_hdr *nd_opt_rh; /* * compute the maximum size for icmp6 redirect header option. * XXX room for auth header? */ len = maxlen - (p - (u_char *)ip6); len &= ~7; /* This is just for simplicity. */ if (m0->m_pkthdr.len != m0->m_len) { if (m0->m_next) { m_freem(m0->m_next); m0->m_next = NULL; } m0->m_pkthdr.len = m0->m_len; } /* * Redirected header option spec (RFC2461 4.6.3) talks nothing * about padding/truncate rule for the original IP packet. * From the discussion on IPv6imp in Feb 1999, the consensus was: * - "attach as much as possible" is the goal * - pad if not aligned (original size can be guessed by original * ip6 header) * Following code adds the padding if it is simple enough, * and truncates if not. */ if (m0->m_next || m0->m_pkthdr.len != m0->m_len) panic("assumption failed in %s:%d\n", __FILE__, __LINE__); if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { /* not enough room, truncate */ m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); } else { /* enough room, pad or truncate */ size_t extra; extra = m0->m_pkthdr.len % 8; if (extra) { /* pad if easy enough, truncate if not */ if (8 - extra <= M_TRAILINGSPACE(m0)) { /* pad */ m0->m_len += (8 - extra); m0->m_pkthdr.len += (8 - extra); } else { /* truncate */ m0->m_pkthdr.len -= extra; m0->m_len -= extra; } } len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); } nd_opt_rh = (struct nd_opt_rd_hdr *)p; bzero(nd_opt_rh, sizeof(*nd_opt_rh)); nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; nd_opt_rh->nd_opt_rh_len = len >> 3; p += sizeof(*nd_opt_rh); m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; /* connect m0 to m */ m->m_next = m0; m->m_pkthdr.len = m->m_len + m0->m_len; } noredhdropt:; if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src)) sip6->ip6_src.s6_addr16[1] = 0; if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst)) sip6->ip6_dst.s6_addr16[1] = 0; #if 0 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) ip6->ip6_src.s6_addr16[1] = 0; if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) ip6->ip6_dst.s6_addr16[1] = 0; #endif if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target)) nd_rd->nd_rd_target.s6_addr16[1] = 0; if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst)) nd_rd->nd_rd_dst.s6_addr16[1] = 0; ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); nd_rd->nd_rd_cksum = 0; nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); /* send the packet to outside... */ if (ip6_output(m, NULL, NULL, 0, NULL, NULL) != 0) icmp6_ifstat_inc(ifp, ifs6_out_error); icmp6_ifstat_inc(ifp, ifs6_out_msg); icmp6_ifstat_inc(ifp, ifs6_out_redirect); icmp6stat.icp6s_outhist[ND_REDIRECT]++; return; fail: if (m) m_freem(m); if (m0) m_freem(m0); } /* NRL PCB */ #define sotoin6pcb sotoinpcb #define in6pcb inpcb #define in6p_icmp6filt inp_icmp6filt /* * ICMPv6 socket option processing. */ int icmp6_ctloutput(op, so, level, optname, mp) int op; struct socket *so; int level, optname; struct mbuf **mp; { int error = 0; int optlen; struct in6pcb *in6p = sotoin6pcb(so); struct mbuf *m = *mp; optlen = m ? m->m_len : 0; if (level != IPPROTO_ICMPV6) { if (op == PRCO_SETOPT && m) (void)m_free(m); return EINVAL; } switch (op) { case PRCO_SETOPT: switch (optname) { case ICMP6_FILTER: { struct icmp6_filter *p; if (optlen != sizeof(*p)) { error = EMSGSIZE; break; } p = mtod(m, struct icmp6_filter *); if (!p || !in6p->in6p_icmp6filt) { error = EINVAL; break; } bcopy(p, in6p->in6p_icmp6filt, sizeof(struct icmp6_filter)); error = 0; break; } default: error = ENOPROTOOPT; break; } if (m) (void)m_freem(m); break; case PRCO_GETOPT: switch (optname) { case ICMP6_FILTER: { struct icmp6_filter *p; if (!in6p->in6p_icmp6filt) { error = EINVAL; break; } *mp = m = m_get(M_WAIT, MT_SOOPTS); m->m_len = sizeof(struct icmp6_filter); p = mtod(m, struct icmp6_filter *); bcopy(in6p->in6p_icmp6filt, p, sizeof(struct icmp6_filter)); error = 0; break; } default: error = ENOPROTOOPT; break; } break; } return (error); } /* NRL PCB */ #undef sotoin6pcb #undef in6pcb #undef in6p_icmp6filt /* * Perform rate limit check. * Returns 0 if it is okay to send the icmp6 packet. * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate * limitation. * * XXX per-destination/type check necessary? */ static int icmp6_ratelimit(dst, type, code) const struct in6_addr *dst; /* not used at this moment */ const int type; /* not used at this moment */ const int code; /* not used at this moment */ { int ret; ret = 0; /* okay to send */ /* PPS limit */ if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, icmp6errppslim)) { /* The packet is subject to rate limit */ ret++; } return ret; } static struct rtentry * icmp6_mtudisc_clone(dst) struct sockaddr *dst; { struct rtentry *rt; int error; rt = rtalloc1(dst, 1); if (rt == 0) return NULL; /* 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 NULL; } nrt->rt_rmx = rt->rt_rmx; rtfree(rt); rt = nrt; } error = rt_timer_add(rt, icmp6_mtudisc_timeout, icmp6_mtudisc_timeout_q); if (error) { rtfree(rt); return NULL; } return rt; /* caller need to call rtfree() */ } static void icmp6_mtudisc_timeout(rt, r) struct rtentry *rt; struct rttimer *r; { if (rt == NULL) panic("icmp6_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)) rt->rt_rmx.rmx_mtu = 0; } } static void icmp6_redirect_timeout(rt, r) struct rtentry *rt; struct rttimer *r; { if (rt == NULL) panic("icmp6_redirect_timeout: bad route to timeout"); if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt), rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); } } #include #include int icmp6_sysctl(name, namelen, oldp, oldlenp, newp, newlen) int *name; u_int namelen; void *oldp; size_t *oldlenp; void *newp; size_t newlen; { /* All sysctl names at this level are terminal. */ if (namelen != 1) return ENOTDIR; switch (name[0]) { case ICMPV6CTL_REDIRACCEPT: return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6_rediraccept); case ICMPV6CTL_REDIRTIMEOUT: return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6_redirtimeout); case ICMPV6CTL_STATS: return sysctl_rdstruct(oldp, oldlenp, newp, &icmp6stat, sizeof(icmp6stat)); case ICMPV6CTL_ND6_PRUNE: return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_prune); case ICMPV6CTL_ND6_DELAY: return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_delay); case ICMPV6CTL_ND6_UMAXTRIES: return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_umaxtries); case ICMPV6CTL_ND6_MMAXTRIES: return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_mmaxtries); case ICMPV6CTL_ND6_USELOOPBACK: return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_useloopback); case ICMPV6CTL_NODEINFO: return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6_nodeinfo); case ICMPV6CTL_ERRPPSLIMIT: return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6errppslim); case ICMPV6CTL_ND6_MAXNUDHINT: return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_maxnudhint); case ICMPV6CTL_MTUDISC_HIWAT: return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6_mtudisc_hiwat); case ICMPV6CTL_MTUDISC_LOWAT: return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6_mtudisc_lowat); case ICMPV6CTL_ND6_DEBUG: return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_debug); case ICMPV6CTL_ND6_DRLIST: case ICMPV6CTL_ND6_PRLIST: return nd6_sysctl(name[0], oldp, oldlenp, newp, newlen); default: return ENOPROTOOPT; } /* NOTREACHED */ }