/* * Copyright (c) 2000-2014 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* $FreeBSD: src/sys/netinet6/icmp6.c,v 1.6.2.6 2001/07/10 09:44:16 ume Exp $ */ /* $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun 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 #include #include #include #if IPSEC #include #include #endif #include #if NECP #include #endif extern struct ip6protosw *ip6_protox[]; extern uint32_t rip_sendspace; extern uint32_t rip_recvspace; struct icmp6stat icmp6stat; extern struct inpcbhead ripcb; extern int icmp6errppslim; extern int icmp6rappslim; static int icmp6errpps_count = 0; static int icmp6rapps_count = 0; static struct timeval icmp6errppslim_last; static struct timeval icmp6rappslim_last; extern int icmp6_nodeinfo; extern struct inpcbinfo ripcbinfo; 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 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); void icmp6_init(struct ip6protosw *pp, struct domain *dp) { #pragma unused(dp) static int icmp6_initialized = 0; /* Also called from ip6_init() without pp */ VERIFY(pp == NULL || (pp->pr_flags & (PR_INITIALIZED|PR_ATTACHED)) == PR_ATTACHED); /* This gets called by more than one protocols, so initialize once */ if (!icmp6_initialized) { icmp6_initialized = 1; mld_init(); } } 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++; } /* * A wrapper function for icmp6_error() necessary when the erroneous packet * may not contain enough scope zone information. */ void icmp6_error2(struct mbuf *m, int type, int code, int param, struct ifnet *ifp) { struct ip6_hdr *ip6; if (ifp == NULL) return; #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr),return ); #else if (m->m_len < sizeof(struct ip6_hdr)) { m = m_pullup(m, sizeof(struct ip6_hdr)); if (m == NULL) return; } #endif ip6 = mtod(m, struct ip6_hdr *); if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) return; if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) return; icmp6_error(m, type, code, param); } /* * Generate an error packet of type error in response to bad IP6 packet. */ void icmp6_error(struct mbuf *m, int type, int code, int 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); #ifdef M_DECRYPTED /*not openbsd*/ if (m->m_flags & M_DECRYPTED) { icmp6stat.icp6s_canterror++; goto freeit; } #endif #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), return); #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), return); 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; in6_clearscope(&oip6->ip6_src); in6_clearscope(&oip6->ip6_dst); 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 output 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 whether or not we can generate ICMP6, free it. */ m_freem(m); } /* * Process a received ICMP6 message. */ int icmp6_input(struct mbuf **mp, int *offp, int proto) { #pragma unused(proto) struct mbuf *m = *mp, *n; struct ifnet *ifp; struct ip6_hdr *ip6, *nip6; struct icmp6_hdr *icmp6, *nicmp6; int off = *offp; int icmp6len = m->m_pkthdr.len - *offp; int code, sum, noff, proxy = 0; ifp = m->m_pkthdr.rcvif; #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), return IPPROTO_DONE); /* m might change if M_LOOP. So, call mtod after this */ #endif /* Expect 32-bit aligned data pointer on strict-align platforms */ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m); /* * 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++; goto freeit; } #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++; return IPPROTO_DONE; } #endif code = icmp6->icmp6_code; /* Apply rate limit before checksum validation. */ if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) { icmp6stat.icp6s_toofreq++; goto freeit; } /* * Check multicast group membership. * Note: SSM filters are not applied for ICMPv6 traffic. */ if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { struct in6_multi *inm; in6_multihead_lock_shared(); IN6_LOOKUP_MULTI(&ip6->ip6_dst, ifp, inm); in6_multihead_lock_done(); if (inm == NULL) { /* * Don't discard if this is a Neighbor Solicitation * that needs to be proxied (see check down below.) */ if (!(m->m_pkthdr.pkt_flags & PKTF_PROXY_DST)) { ip6stat.ip6s_notmember++; in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); goto freeit; } } else { IN6M_REMREF(inm); } } /* * calculate the checksum */ 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++; goto freeit; } if (m->m_pkthdr.pkt_flags & PKTF_PROXY_DST) { /* * This is the special case of proxying NS (dst is either * solicited-node multicast or unicast); process it locally * but don't deliver it to sockets. It practically lets us * steer the packet to nd6_prproxy_ns_input, where more * specific tests and actions will be taken. */ switch (icmp6->icmp6_type) { case ND_NEIGHBOR_SOLICIT: proxy = 1; break; default: goto freeit; } } icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 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; case ICMP6_DST_UNREACH_BEYONDSCOPE: /* I mean "source address was incorrect." */ code = PRC_PARAMPROB; break; 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); 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; if ((n = m_copy(m, 0, M_COPYALL)) == NULL) { /* Give up remote */ goto rate_limit_checked; break; } 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); goto rate_limit_checked; break; } MGETHDR(n, M_DONTWAIT, n0->m_type); /* MAC-OK */ 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 */ m_freem(n0); goto rate_limit_checked; break; } M_COPY_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_pkthdr.len = n->m_len = noff + sizeof(struct icmp6_hdr); /* * Adjust mbuf. ip6_plen will be adjusted in * ip6_output(). */ m_adj(n0, off + sizeof(struct icmp6_hdr)); n->m_pkthdr.len += n0->m_pkthdr.len; n->m_next = n0; n0->m_flags &= ~M_PKTHDR; } else { nip6 = mtod(n, struct ip6_hdr *); IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, sizeof(*nicmp6)); noff = off; } if(nicmp6 == NULL) panic("nicmp6 is NULL in %s, which isn't good!\n", __FUNCTION__); else { 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); } goto rate_limit_checked; break; case ICMP6_ECHO_REPLY: icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); if (code != 0) goto badcode; break; case MLD_LISTENER_QUERY: case MLD_LISTENER_REPORT: if (icmp6len < sizeof(struct mld_hdr)) goto badlen; if (icmp6->icmp6_type == MLD_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 */ if (mld_input(m, off, icmp6len) == IPPROTO_DONE) m = NULL; goto freeit; } if (mld_input(n, off, icmp6len) != IPPROTO_DONE) m_freem(n); /* m stays. */ goto rate_limit_checked; break; case MLD_LISTENER_DONE: icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ goto badlen; break; /* nothing to be done in kernel */ case MLD_MTRACE_RESP: case MLD_MTRACE: /* XXX: these two are experimental. not officially defined. */ /* XXX: per-interface statistics? */ break; /* just pass it to applications */ case ICMP6_NI_QUERY: if (!icmp6_nodeinfo) break; //### LD 10/20 Check fbsd differences here. Not sure we're more advanced or not. /* By RFC 4620 refuse to answer queries from global scope addresses */ if ((icmp6_nodeinfo & 8) != 8 && in6_addrscope(&ip6->ip6_src) == IPV6_ADDR_SCOPE_GLOBAL) break; if (icmp6len < sizeof(struct icmp6_nodeinfo)) goto badlen; #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), return IPPROTO_DONE); #endif n = m_copy(m, 0, M_COPYALL); if (n) n = ni6_input(n, off); if (n) { noff = sizeof(struct ip6_hdr); icmp6stat.icp6s_reflect++; icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; icmp6_reflect(n, noff); } goto rate_limit_checked; 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. */ goto rate_limit_checked; 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. */ goto rate_limit_checked; 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. */ goto rate_limit_checked; 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. */ goto rate_limit_checked; 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. */ goto rate_limit_checked; 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 */ goto rate_limit_checked; 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; } rate_limit_checked: /* deliver the packet to appropriate sockets (unless proxying) */ if (!proxy) { 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, code; { 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), return -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), return -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), return -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, return -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 *)(void *)(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), return -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 /* * retrieve parameters from the inner IPv6 header, and convert * them into sockaddr structures. * XXX: there is no guarantee that the source or destination * addresses of the inner packet are in the same scope as * the addresses of the icmp packet. But there is no other * way to determine the zone. */ 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; if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL)) goto freeit; bzero(&icmp6src, sizeof(icmp6src)); icmp6src.sin6_len = sizeof(struct sockaddr_in6); icmp6src.sin6_family = AF_INET6; icmp6src.sin6_addr = eip6->ip6_src; if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL)) goto freeit; 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; icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/ } ctlfunc = (void (*)(int, struct sockaddr *, void *)) (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; { 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; /* * we reject ICMPv6 too big with abnormally small value. * XXX what is the good definition of "abnormally small"? */ if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) return; if (!validated) return; /* * In case the suggested mtu is less than IPV6_MMTU, we * only need to remember that it was for above mentioned * "alwaysfrag" case. * Try to be as close to the spec as possible. */ if (mtu < IPV6_MMTU) mtu = IPV6_MMTU - 8; 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 = rtalloc1_scoped((struct sockaddr *)&sin6, 0, RTF_CLONING | RTF_PRCLONING, m->m_pkthdr.rcvif->if_index); if (rt != NULL) { RT_LOCK(rt); if ((rt->rt_flags & RTF_HOST) && !(rt->rt_rmx.rmx_locks & RTV_MTU) && mtu < IN6_LINKMTU(rt->rt_ifp) && rt->rt_rmx.rmx_mtu > mtu) { icmp6stat.icp6s_pmtuchg++; rt->rt_rmx.rmx_mtu = mtu; } RT_UNLOCK(rt); rtfree(rt); } } /* * 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) */ #define hostnamelen strlen(hostname) 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 sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */ 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 source address. * The default configuration MUST be to refuse answering queries from * global-scope addresses according to RFC4602. * Notes: * - it's not very clear what "refuse" means; this implementation * simply drops it. * - it's not very easy to identify global-scope (unicast) addresses * since there are many prefixes for them. It should be safer * and in practice sufficient to check "all" but loopback and * link-local (note that site-local unicast was deprecated and * ULA is defined as global scope-wise) */ if ((icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 && !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) && !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) goto bad; /* * 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. * [RFC4602, Section 5.] */ if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) goto bad; /* else it's a link-local multicast, fine */ } else { /* unicast or anycast */ uint32_t ia6_flags; if (ip6_getdstifaddr_info(m, NULL, &ia6_flags) != 0) goto bad; /* XXX impossible */ if ((ia6_flags & IN6_IFF_TEMPORARY) && !(icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) { nd6log((LOG_DEBUG, "ni6_input: ignore node info to " "a temporary address in %s:%d", __FILE__, __LINE__)); 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: case NI_QTYPE_IPV4ADDR: 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(struct in6_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); sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, &sin6.sin6_addr); in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL, NULL); bzero(&sin6_d, sizeof(sin6_d)); sin6_d.sin6_family = AF_INET6; /* not used, actually */ sin6_d.sin6_len = sizeof(sin6_d); /* ditto */ sin6_d.sin6_addr = ip6->ip6_dst; sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, &ip6->ip6_dst); in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL, NULL); subj = (char *)&sin6; if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d)) 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 & ICMP6_NODEINFO_FQDNOK) == 0) goto bad; break; case NI_QTYPE_NODEADDR: case NI_QTYPE_IPV4ADDR: if ((icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 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, &ifp, subj); if ((replylen += addrs * (sizeof(struct in6_addr) + sizeof(u_int32_t))) > MCLBYTES) replylen = MCLBYTES; /* XXX: will truncate pkt later */ break; case NI_QTYPE_IPV4ADDR: /* unsupported - should respond with unknown Qtype? */ 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); /* MAC-OK */ if (n == NULL) { m_freem(m); if (ifp != NULL) ifnet_release(ifp); return (NULL); } M_COPY_PKTHDR(n, m); /* just for recvif */ 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); if (ifp != NULL) ifnet_release(ifp); return (n); bad: m_freem(m); if (n) m_freem(n); if (ifp != NULL) ifnet_release(ifp); return (NULL); } #undef hostnamelen /* * 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; bcopy(p, cp, i); cp += 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, ifpp, subj) struct icmp6_nodeinfo *ni6; 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 (ifpp != NULL) *ifpp = NULL; 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 *)(void *)subj; break; default: /* * XXX: we only support IPv6 subject address for * this Qtype. */ return (0); } } ifnet_head_lock_shared(); TAILQ_FOREACH(ifp, &ifnet_head, if_list) { addrsofif = 0; ifnet_lock_shared(ifp); TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { IFA_LOCK(ifa); if (ifa->ifa_addr->sa_family != AF_INET6) { IFA_UNLOCK(ifa); 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) { IFA_UNLOCK(ifa); continue; } break; case IPV6_ADDR_SCOPE_SITELOCAL: if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) { IFA_UNLOCK(ifa); continue; } break; case IPV6_ADDR_SCOPE_GLOBAL: if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) { IFA_UNLOCK(ifa); continue; } break; default: IFA_UNLOCK(ifa); 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) { IFA_UNLOCK(ifa); continue; /* we need only unicast addresses */ } if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && (icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) { IFA_UNLOCK(ifa); continue; } addrsofif++; /* count the address */ IFA_UNLOCK(ifa); } ifnet_lock_done(ifp); if (iffound) { if (ifpp != NULL) { *ifpp = ifp; ifnet_reference(ifp); } ifnet_head_done(); return(addrsofif); } addrs += addrsofif; } ifnet_head_done(); 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; 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; uint64_t now = net_uptime(); if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) return (0); /* needless to copy */ again: ifnet_head_lock_shared(); if (ifp == NULL) ifp = TAILQ_FIRST(&ifnet_head); for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) { ifnet_lock_shared(ifp); for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { struct in6_addrlifetime_i *lt; IFA_LOCK(ifa); if (ifa->ifa_addr->sa_family != AF_INET6) { IFA_UNLOCK(ifa); 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; IFA_UNLOCK(ifa); continue; } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && allow_deprecated != 0) { IFA_UNLOCK(ifa); 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) { IFA_UNLOCK(ifa); continue; } break; case IPV6_ADDR_SCOPE_SITELOCAL: if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) { IFA_UNLOCK(ifa); continue; } break; case IPV6_ADDR_SCOPE_GLOBAL: if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) { IFA_UNLOCK(ifa); continue; } break; default: IFA_UNLOCK(ifa); 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) { IFA_UNLOCK(ifa); continue; } if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && (icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) { IFA_UNLOCK(ifa); continue; } /* now we can copy the address */ if (resid < sizeof(struct in6_addr) + sizeof(u_int32_t)) { IFA_UNLOCK(ifa); /* * We give up much more copy. * Set the truncate flag and return. */ nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; ifnet_lock_done(ifp); ifnet_head_done(); 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. */ lt = &ifa6->ia6_lifetime; if (lt->ia6ti_expire == 0) { ltime = ND6_INFINITE_LIFETIME; } else { if (lt->ia6ti_expire > now) ltime = htonl(lt->ia6ti_expire - now); 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 *)(void *)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)); IFA_UNLOCK(ifa); } ifnet_lock_done(ifp); if (ifp0) /* we need search only on the specified IF */ break; } ifnet_head_done(); 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; int ret = 0; struct ifnet *ifp = m->m_pkthdr.rcvif; #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 /* * XXX: the address may have embedded scope zone ID, which should be * hidden from applications. */ bzero(&rip6src, sizeof(rip6src)); rip6src.sin6_family = AF_INET6; rip6src.sin6_len = sizeof(struct sockaddr_in6); rip6src.sin6_addr = ip6->ip6_src; if (sa6_recoverscope(&rip6src, TRUE)) return (IPPROTO_DONE); lck_rw_lock_shared(ripcbinfo.ipi_lock); LIST_FOREACH(in6p, &ripcb, inp_list) { if ((in6p->inp_vflag & INP_IPV6) == 0) 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 (inp_restricted_recv(in6p, ifp)) continue; if (last) { struct mbuf *n; if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { if ((last->in6p_flags & INP_CONTROLOPTS) != 0 || (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 || (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) { ret = ip6_savecontrol(last, n, &opts); if (ret != 0) { m_freem(n); m_freem(opts); last = in6p; continue; } } /* strip intermediate headers */ m_adj(n, off); so_recv_data_stat(last->in6p_socket, m, 0); if (sbappendaddr(&last->in6p_socket->so_rcv, (struct sockaddr *)&rip6src, n, opts, NULL) != 0) { sorwakeup(last->in6p_socket); } opts = NULL; } } last = in6p; } if (last) { if ((last->in6p_flags & INP_CONTROLOPTS) != 0 || (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 || (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) { ret = ip6_savecontrol(last, m, &opts); if (ret != 0) { goto error; } } /* strip intermediate headers */ m_adj(m, off); so_recv_data_stat(last->in6p_socket, m, 0); if (sbappendaddr(&last->in6p_socket->so_rcv, (struct sockaddr *)&rip6src, m, opts, NULL) != 0) { sorwakeup(last->in6p_socket); } } else { goto error; } lck_rw_done(ripcbinfo.ipi_lock); return IPPROTO_DONE; error: lck_rw_done(ripcbinfo.ipi_lock); m_freem(m); m_freem(opts); 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. */ void icmp6_reflect(m, off) struct mbuf *m; size_t off; { struct mbuf *m_ip6hdr = m; struct ip6_hdr *ip6; struct icmp6_hdr *icmp6; struct in6_ifaddr *ia; struct in6_addr t, src_storage, *src = 0; int plen; int type, code; struct ifnet *outif = NULL; struct sockaddr_in6 sa6_src, sa6_dst; struct nd_ifinfo *ndi; u_int32_t oflow; struct ip6_out_args ip6oa = { IFSCOPE_NONE, { 0 }, IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR, 0 }; if (!(m->m_pkthdr.pkt_flags & PKTF_LOOP) && m->m_pkthdr.rcvif != NULL) { ip6oa.ip6oa_boundif = m->m_pkthdr.rcvif->if_index; ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF; } /* 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_int32_t)off, (u_int32_t)sizeof(struct ip6_hdr), __FILE__, __LINE__)); goto bad; } /* * If there are extra headers between IPv6 and ICMPv6, strip * off that header first. */ 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_ip6hdr = m_pulldown(m, 0, l, NULL)) == 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_ip6hdr = m_pulldown(m, 0, l, NULL)) == NULL) return; } } plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); ip6 = mtod(m_ip6hdr, 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. */ 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, 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, 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 should be VERY rare, but is possible * (for example) when we encounter an error while forwarding procedure * destined to a duplicated address of ours. * Note that ip6_getdstifaddr() may fail if we are in an error handling * procedure of an outgoing packet of our own, in which case we need * to search in the ifaddr list. */ lck_rw_lock_shared(&in6_ifaddr_rwlock); for (ia = in6_ifaddrs; ia; ia = ia->ia_next) { IFA_LOCK(&ia->ia_ifa); if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { IFA_UNLOCK(&ia->ia_ifa); src = &t; break; } IFA_UNLOCK(&ia->ia_ifa); } lck_rw_done(&in6_ifaddr_rwlock); if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && ((m->m_flags & M_LOOP) || (m->m_pkthdr.pkt_flags & PKTF_LOOP))) { /* * This is the case if the dst is our link-local address * and the sender is also ourselves. Here we test for both * M_LOOP and PKTF_LOOP, since the former may have been set * in ip6_output() and that we get here as part of callling * ip6_process_hopopts(). See comments in */ src = &t; } if (src == NULL) { int e; struct sockaddr_in6 sin6; 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(&sin6, sizeof(sin6)); sin6.sin6_family = AF_INET6; sin6.sin6_len = sizeof(sin6); sin6.sin6_addr = ip6->ip6_dst; /* zone ID should be embedded */ bzero(&ro, sizeof(ro)); /* * in6_selectsrc() might return outif with its reference held * even in the error case, so we always need to release it * if non-NULL. */ src = in6_selectsrc(&sin6, NULL, NULL, &ro, &outif, &src_storage, ip6oa.ip6oa_boundif, &e); ROUTE_RELEASE(&ro); 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; } } oflow = ip6->ip6_flow; /* Save for later */ ip6->ip6_src = *src; ip6->ip6_flow = 0; ip6->ip6_vfc &= ~IPV6_VERSION_MASK; ip6->ip6_vfc |= IPV6_VERSION; if (icmp6->icmp6_type == ICMP6_ECHO_REPLY && icmp6->icmp6_code == 0) { ip6->ip6_flow |= (oflow & htonl(0x0ff00000)); } ip6->ip6_nxt = IPPROTO_ICMPV6; lck_rw_lock_shared(nd_if_rwlock); if (outif != NULL && (ndi = ND_IFINFO(outif)) != NULL && ndi->initialized) { lck_mtx_lock(&ndi->lock); ip6->ip6_hlim = ndi->chlim; lck_mtx_unlock(&ndi->lock); } if (m->m_pkthdr.rcvif != NULL && (ndi = ND_IFINFO(m->m_pkthdr.rcvif)) != NULL && ndi->initialized) { /* XXX: This may not be the outgoing interface */ lck_mtx_lock(&ndi->lock); ip6->ip6_hlim = ndi->chlim; lck_mtx_unlock(&ndi->lock); } else { ip6->ip6_hlim = ip6_defhlim; } lck_rw_done(nd_if_rwlock); /* Use the same traffic class as in the request to match IPv4 */ 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); if (outif != NULL) { ifnet_release(outif); outif = NULL; } m->m_pkthdr.rcvif = NULL; m->m_pkthdr.csum_data = 0; m->m_pkthdr.csum_flags = 0; ip6_output(m, NULL, NULL, IPV6_OUTARGS, NULL, &outif, &ip6oa); if (outif != NULL) { icmp6_ifoutstat_inc(outif, type, code); ifnet_release(outif); } return; bad: m_freem(m); if (outif != NULL) ifnet_release(outif); return; } 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 (!m || !ifp) return; /* * If we are an advertising router on this interface, * don't update route by icmp6 redirect. */ if (ifp->if_eflags & IFEF_IPV6_ROUTER) goto freeit; if (!icmp6_rediraccept) goto freeit; #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, icmp6len, return); 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_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) || in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) { goto freeit; } /* 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_scoped((struct sockaddr *)&sin6, 0, 0, ifp->if_index); if (rt) { RT_LOCK(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))); RT_UNLOCK(rt); rtfree(rt); goto bad; } gw6 = &(((struct sockaddr_in6 *)(void *) 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))); RT_UNLOCK(rt); 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; } RT_UNLOCK(rt); 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; 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(ifp, (struct sockaddr *)&sdst, (struct sockaddr *)&sgw, NULL, RTF_GATEWAY | RTF_HOST, (struct sockaddr *)&ssrc, NULL); } /* 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); #if IPSEC key_sa_routechange((struct sockaddr *)&sdst); #endif } 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 *router_ll6; 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 ifnet *outif = NULL; struct sockaddr_in6 src_sa; struct ip6_out_args ip6oa = { IFSCOPE_NONE, { 0 }, IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR, 0 }; icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); if (rt != NULL) RT_LOCK(rt); /* sanity check */ if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) goto fail; /* * If we are not a router to begin with, or not an advertising * router on this interface, don't send icmp6 redirect. */ if (!ip6_forwarding || !(ifp->if_eflags & IFEF_IPV6_ROUTER)) 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); RT_UNLOCK(rt); if (nd6_is_addr_neighbor(&src_sa, ifp, 0) == 0) { /* already unlocked */ rt = NULL; goto fail; } RT_LOCK(rt); 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); /* MAC-OK */ 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; IFA_LOCK(&ia->ia_ifa); ifp_ll6 = ia->ia_addr.sin6_addr; IFA_UNLOCK(&ia->ia_ifa); IFA_REMREF(&ia->ia_ifa); } /* get ip6 linklocal address for the router. */ if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { struct sockaddr_in6 *sin6; sin6 = (struct sockaddr_in6 *)(void *)rt->rt_gateway; router_ll6 = &sin6->sin6_addr; if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) router_ll6 = (struct in6_addr *)NULL; } else router_ll6 = (struct in6_addr *)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 (!router_ll6) goto fail; bcopy(router_ll6, &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 */ 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)); } RT_UNLOCK(rt); rt = NULL; p = (u_char *)(nd_rd + 1); if (!router_ll6) goto nolladdropt; { /* target lladdr option */ struct rtentry *rt_router = NULL; int len; struct sockaddr_dl *sdl; struct nd_opt_hdr *nd_opt; char *lladdr; /* Callee returns a locked route upon success */ rt_router = nd6_lookup(router_ll6, 0, ifp, 0); if (!rt_router) goto nolladdropt; RT_LOCK_ASSERT_HELD(rt_router); len = sizeof(*nd_opt) + ifp->if_addrlen; len = (len + 7) & ~7; /* round by 8 */ /* safety check */ if (len + (p - (u_char *)ip6) > maxlen) { RT_REMREF_LOCKED(rt_router); RT_UNLOCK(rt_router); goto nolladdropt; } if (!(rt_router->rt_flags & RTF_GATEWAY) && (rt_router->rt_flags & RTF_LLINFO) && (rt_router->rt_gateway->sa_family == AF_LINK) && (sdl = (struct sockaddr_dl *)(void *) rt_router->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; } RT_REMREF_LOCKED(rt_router); RT_UNLOCK(rt_router); } nolladdropt:; m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; /* just to be safe */ #ifdef M_DECRYPTED /*not openbsd*/ if (m0->m_flags & M_DECRYPTED) goto noredhdropt; #endif 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:; /* XXX: clear embedded link IDs in the inner header */ in6_clearscope(&sip6->ip6_src); in6_clearscope(&sip6->ip6_dst); in6_clearscope(&nd_rd->nd_rd_target); in6_clearscope(&nd_rd->nd_rd_dst); 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... */ ip6oa.ip6oa_boundif = ifp->if_index; ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF; ip6_output(m, NULL, NULL, IPV6_OUTARGS, NULL, &outif, &ip6oa); if (outif) { icmp6_ifstat_inc(outif, ifs6_out_msg); icmp6_ifstat_inc(outif, ifs6_out_redirect); ifnet_release(outif); } icmp6stat.icp6s_outhist[ND_REDIRECT]++; return; fail: if (rt != NULL) RT_UNLOCK(rt); if (m) m_freem(m); if (m0) m_freem(m0); } /* * ICMPv6 socket option processing. */ int icmp6_ctloutput(so, sopt) struct socket *so; struct sockopt *sopt; { int error = 0; int optlen; struct inpcb *inp = sotoinpcb(so); int level, op, optname; if (sopt) { level = sopt->sopt_level; op = sopt->sopt_dir; optname = sopt->sopt_name; optlen = sopt->sopt_valsize; } else level = op = optname = optlen = 0; if (level != IPPROTO_ICMPV6) { return EINVAL; } switch (op) { case PRCO_SETOPT: switch (optname) { case ICMP6_FILTER: { struct icmp6_filter *p; if (optlen != 0 && optlen != sizeof(*p)) { error = EMSGSIZE; break; } if (inp->in6p_icmp6filt == NULL) { error = EINVAL; break; } if (optlen == 0) { /* According to RFC 3542, an installed filter can be * cleared by issuing a setsockopt for ICMP6_FILTER * with a zero length. */ ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt); } else { error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen, optlen); } break; } default: error = ENOPROTOOPT; break; } break; case PRCO_GETOPT: switch (optname) { case ICMP6_FILTER: { if (inp->in6p_icmp6filt == NULL) { error = EINVAL; break; } error = sooptcopyout(sopt, inp->in6p_icmp6filt, min(sizeof(struct icmp6_filter), optlen)); break; } default: error = ENOPROTOOPT; break; } break; } return(error); } /* * ICMPv6 socket datagram option processing. */ int icmp6_dgram_ctloutput(struct socket *so, struct sockopt *sopt) { if (kauth_cred_issuser(so->so_cred)) return icmp6_ctloutput(so, sopt); if (sopt->sopt_level == IPPROTO_ICMPV6) { switch (sopt->sopt_name) { case ICMP6_FILTER: return icmp6_ctloutput(so, sopt); default: return EPERM; } } if (sopt->sopt_level != IPPROTO_IPV6) return EINVAL; switch (sopt->sopt_name) { case IPV6_UNICAST_HOPS: case IPV6_CHECKSUM: case IPV6_V6ONLY: case IPV6_USE_MIN_MTU: case IPV6_RECVRTHDR: case IPV6_RECVPKTINFO: case IPV6_RECVHOPLIMIT: case IPV6_PATHMTU: case IPV6_PKTINFO: case IPV6_HOPLIMIT: case IPV6_HOPOPTS: case IPV6_DSTOPTS: case IPV6_MULTICAST_IF: case IPV6_MULTICAST_HOPS: case IPV6_MULTICAST_LOOP: case IPV6_JOIN_GROUP: case IPV6_LEAVE_GROUP: case IPV6_PORTRANGE: case IPV6_IPSEC_POLICY: case IPV6_RECVTCLASS: case IPV6_TCLASS: case IPV6_2292PKTOPTIONS: case IPV6_2292PKTINFO: case IPV6_2292HOPLIMIT: case IPV6_2292HOPOPTS: case IPV6_2292DSTOPTS: case IPV6_2292RTHDR: case IPV6_BOUND_IF: case IPV6_NO_IFT_CELLULAR: return ip6_ctloutput(so, sopt); default: return EPERM; } } __private_extern__ int icmp6_dgram_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, struct mbuf *control, struct proc *p) { #pragma unused(flags, p) int error = 0; struct inpcb *inp = sotoinpcb(so); struct sockaddr_in6 tmp; struct sockaddr_in6 *dst = (struct sockaddr_in6 *)(void *)nam; struct icmp6_hdr *icmp6; if (inp == NULL #if NECP || (necp_socket_should_use_flow_divert(inp)) #endif /* NECP */ ) { error = (inp == NULL ? EINVAL : EPROTOTYPE); goto bad; } if (kauth_cred_issuser(so->so_cred)) return (rip6_output(m, so, SIN6(nam), control, 0)); /* always copy sockaddr to avoid overwrites */ if (so->so_state & SS_ISCONNECTED) { if (nam != NULL) { error = EISCONN; goto bad; } /* XXX */ bzero(&tmp, sizeof(tmp)); tmp.sin6_family = AF_INET6; tmp.sin6_len = sizeof(struct sockaddr_in6); bcopy(&inp->in6p_faddr, &tmp.sin6_addr, sizeof(struct in6_addr)); dst = &tmp; } else { if (nam == NULL) { error = ENOTCONN; goto bad; } tmp = *(struct sockaddr_in6 *)(void *)nam; dst = &tmp; } /* * For an ICMPv6 packet, we should know its type and code */ if (SOCK_PROTO(so) == IPPROTO_ICMPV6) { if (m->m_len < sizeof(struct icmp6_hdr) && (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) { error = ENOBUFS; goto bad; } icmp6 = mtod(m, struct icmp6_hdr *); /* * Allow only to send echo request and node information request * See RFC 2463 for Echo Request Message format */ if ((icmp6->icmp6_type == ICMP6_ECHO_REQUEST && icmp6->icmp6_code == 0) || (icmp6->icmp6_type == ICMP6_NI_QUERY && (icmp6->icmp6_code == ICMP6_NI_SUBJ_IPV6 || icmp6->icmp6_code == ICMP6_NI_SUBJ_FQDN))) { /* Good */ ; } else { error = EPERM; goto bad; } } #if ENABLE_DEFAULT_SCOPE if (dst->sin6_scope_id == 0) { /* not change if specified */ dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr); } #endif return (rip6_output(m, so, dst, control, 0)); bad: VERIFY(error != 0); if (m != NULL) m_freem(m); if (control != NULL) m_freem(control); return (error); } /* Like rip6_attach but without root privilege enforcement */ __private_extern__ int icmp6_dgram_attach(struct socket *so, int proto, struct proc *p) { struct inpcb *inp; int error; inp = sotoinpcb(so); if (inp) panic("icmp6_dgram_attach"); if (proto != IPPROTO_ICMPV6) return EINVAL; error = soreserve(so, rip_sendspace, rip_recvspace); if (error) return error; error = in_pcballoc(so, &ripcbinfo, p); if (error) return error; inp = (struct inpcb *)so->so_pcb; inp->inp_vflag |= INP_IPV6; inp->in6p_ip6_nxt = IPPROTO_ICMPV6; inp->in6p_hops = -1; /* use kernel default */ inp->in6p_cksum = -1; MALLOC(inp->in6p_icmp6filt, struct icmp6_filter *, sizeof(struct icmp6_filter), M_PCB, M_WAITOK); if (inp->in6p_icmp6filt == NULL) return (ENOMEM); ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt); return 0; } /* * 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 check necessary? */ static int icmp6_ratelimit( __unused const struct in6_addr *dst, /* not used at this moment */ const int type, __unused const int code) { int ret; ret = 0; /* okay to send */ /* PPS limit */ if (type == ND_ROUTER_ADVERT) { if (!ppsratecheck(&icmp6rappslim_last, &icmp6rapps_count, icmp6rappslim)) ret++; } else if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, icmp6errppslim)) { /* The packet is subject to rate limit */ ret++; } return ret; }