1caf43b02SWarner Losh /*- 251369649SPedro F. Giffuni * SPDX-License-Identifier: BSD-3-Clause 351369649SPedro F. Giffuni * 482cd038dSYoshinobu Inoue * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 582cd038dSYoshinobu Inoue * All rights reserved. 682cd038dSYoshinobu Inoue * 782cd038dSYoshinobu Inoue * Redistribution and use in source and binary forms, with or without 882cd038dSYoshinobu Inoue * modification, are permitted provided that the following conditions 982cd038dSYoshinobu Inoue * are met: 1082cd038dSYoshinobu Inoue * 1. Redistributions of source code must retain the above copyright 1182cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer. 1282cd038dSYoshinobu Inoue * 2. Redistributions in binary form must reproduce the above copyright 1382cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer in the 1482cd038dSYoshinobu Inoue * documentation and/or other materials provided with the distribution. 1582cd038dSYoshinobu Inoue * 3. Neither the name of the project nor the names of its contributors 1682cd038dSYoshinobu Inoue * may be used to endorse or promote products derived from this software 1782cd038dSYoshinobu Inoue * without specific prior written permission. 1882cd038dSYoshinobu Inoue * 1982cd038dSYoshinobu Inoue * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 2082cd038dSYoshinobu Inoue * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2182cd038dSYoshinobu Inoue * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2282cd038dSYoshinobu Inoue * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2382cd038dSYoshinobu Inoue * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2482cd038dSYoshinobu Inoue * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2582cd038dSYoshinobu Inoue * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2682cd038dSYoshinobu Inoue * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2782cd038dSYoshinobu Inoue * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2882cd038dSYoshinobu Inoue * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2982cd038dSYoshinobu Inoue * SUCH DAMAGE. 30b48287a3SDavid E. O'Brien * 31b48287a3SDavid E. O'Brien * $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $ 3282cd038dSYoshinobu Inoue */ 3382cd038dSYoshinobu Inoue 34caf43b02SWarner Losh /*- 3582cd038dSYoshinobu Inoue * Copyright (c) 1982, 1986, 1988, 1993 3682cd038dSYoshinobu Inoue * The Regents of the University of California. All rights reserved. 3782cd038dSYoshinobu Inoue * 3882cd038dSYoshinobu Inoue * Redistribution and use in source and binary forms, with or without 3982cd038dSYoshinobu Inoue * modification, are permitted provided that the following conditions 4082cd038dSYoshinobu Inoue * are met: 4182cd038dSYoshinobu Inoue * 1. Redistributions of source code must retain the above copyright 4282cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer. 4382cd038dSYoshinobu Inoue * 2. Redistributions in binary form must reproduce the above copyright 4482cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer in the 4582cd038dSYoshinobu Inoue * documentation and/or other materials provided with the distribution. 46fbbd9655SWarner Losh * 3. Neither the name of the University nor the names of its contributors 4782cd038dSYoshinobu Inoue * may be used to endorse or promote products derived from this software 4882cd038dSYoshinobu Inoue * without specific prior written permission. 4982cd038dSYoshinobu Inoue * 5082cd038dSYoshinobu Inoue * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 5182cd038dSYoshinobu Inoue * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 5282cd038dSYoshinobu Inoue * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 5382cd038dSYoshinobu Inoue * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 5482cd038dSYoshinobu Inoue * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 5582cd038dSYoshinobu Inoue * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 5682cd038dSYoshinobu Inoue * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 5782cd038dSYoshinobu Inoue * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 5882cd038dSYoshinobu Inoue * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5982cd038dSYoshinobu Inoue * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 6082cd038dSYoshinobu Inoue * SUCH DAMAGE. 6182cd038dSYoshinobu Inoue * 6282cd038dSYoshinobu Inoue * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 6382cd038dSYoshinobu Inoue */ 6482cd038dSYoshinobu Inoue 65b48287a3SDavid E. O'Brien #include <sys/cdefs.h> 66b48287a3SDavid E. O'Brien __FBSDID("$FreeBSD$"); 67b48287a3SDavid E. O'Brien 68f0cace5dSRobert Watson #define MBUF_PRIVATE /* XXXRW: Optimisation tries to avoid M_EXT mbufs */ 69f0cace5dSRobert Watson 70686cdd19SJun-ichiro itojun Hagino #include "opt_inet.h" 71686cdd19SJun-ichiro itojun Hagino #include "opt_inet6.h" 7282cd038dSYoshinobu Inoue 7382cd038dSYoshinobu Inoue #include <sys/param.h> 74960ed29cSSeigo Tanimura #include <sys/domain.h> 7576ca6f88SJamie Gritton #include <sys/jail.h> 76960ed29cSSeigo Tanimura #include <sys/kernel.h> 77960ed29cSSeigo Tanimura #include <sys/lock.h> 7833841545SHajimu UMEMOTO #include <sys/malloc.h> 7982cd038dSYoshinobu Inoue #include <sys/mbuf.h> 80530c0060SRobert Watson #include <sys/proc.h> 8182cd038dSYoshinobu Inoue #include <sys/protosw.h> 82960ed29cSSeigo Tanimura #include <sys/signalvar.h> 8382cd038dSYoshinobu Inoue #include <sys/socket.h> 8482cd038dSYoshinobu Inoue #include <sys/socketvar.h> 85960ed29cSSeigo Tanimura #include <sys/sx.h> 8682cd038dSYoshinobu Inoue #include <sys/syslog.h> 87960ed29cSSeigo Tanimura #include <sys/systm.h> 88960ed29cSSeigo Tanimura #include <sys/time.h> 8982cd038dSYoshinobu Inoue 9082cd038dSYoshinobu Inoue #include <net/if.h> 9176039bc8SGleb Smirnoff #include <net/if_var.h> 9282cd038dSYoshinobu Inoue #include <net/if_dl.h> 936e6b3f7cSQing Li #include <net/if_llatbl.h> 9482cd038dSYoshinobu Inoue #include <net/if_types.h> 95960ed29cSSeigo Tanimura #include <net/route.h> 964b79449eSBjoern A. Zeeb #include <net/vnet.h> 9782cd038dSYoshinobu Inoue 9882cd038dSYoshinobu Inoue #include <netinet/in.h> 99960ed29cSSeigo Tanimura #include <netinet/in_pcb.h> 10082cd038dSYoshinobu Inoue #include <netinet/in_var.h> 101686cdd19SJun-ichiro itojun Hagino #include <netinet/ip6.h> 102686cdd19SJun-ichiro itojun Hagino #include <netinet/icmp6.h> 10397d8d152SAndre Oppermann #include <netinet/tcp_var.h> 1044b79449eSBjoern A. Zeeb 1059977be4aSAlexander V. Chernikov #include <netinet6/in6_fib.h> 10682cd038dSYoshinobu Inoue #include <netinet6/in6_ifattach.h> 107960ed29cSSeigo Tanimura #include <netinet6/in6_pcb.h> 10882cd038dSYoshinobu Inoue #include <netinet6/ip6protosw.h> 109960ed29cSSeigo Tanimura #include <netinet6/ip6_var.h> 110a1f7e5f8SHajimu UMEMOTO #include <netinet6/scope6_var.h> 111960ed29cSSeigo Tanimura #include <netinet6/mld6_var.h> 112960ed29cSSeigo Tanimura #include <netinet6/nd6.h> 1131db8d1f8SAna Kukec #include <netinet6/send.h> 11482cd038dSYoshinobu Inoue 11582cd038dSYoshinobu Inoue extern struct domain inet6domain; 11697021c24SMarko Zec 117a786f679SAndrey V. Elsukov VNET_PCPUSTAT_DEFINE(struct icmp6stat, icmp6stat); 118a786f679SAndrey V. Elsukov VNET_PCPUSTAT_SYSINIT(icmp6stat); 119a786f679SAndrey V. Elsukov 120a786f679SAndrey V. Elsukov #ifdef VIMAGE 121a786f679SAndrey V. Elsukov VNET_PCPUSTAT_SYSUNINIT(icmp6stat); 122a786f679SAndrey V. Elsukov #endif /* VIMAGE */ 12382cea7e6SBjoern A. Zeeb 124eddfbb76SRobert Watson VNET_DECLARE(struct inpcbinfo, ripcbinfo); 125eddfbb76SRobert Watson VNET_DECLARE(struct inpcbhead, ripcb); 126eddfbb76SRobert Watson VNET_DECLARE(int, icmp6errppslim); 1275f901c92SAndrew Turner VNET_DEFINE_STATIC(int, icmp6errpps_count) = 0; 1285f901c92SAndrew Turner VNET_DEFINE_STATIC(struct timeval, icmp6errppslim_last); 129eddfbb76SRobert Watson VNET_DECLARE(int, icmp6_nodeinfo); 13082cd038dSYoshinobu Inoue 1311e77c105SRobert Watson #define V_ripcbinfo VNET(ripcbinfo) 1321e77c105SRobert Watson #define V_ripcb VNET(ripcb) 1331e77c105SRobert Watson #define V_icmp6errppslim VNET(icmp6errppslim) 1341e77c105SRobert Watson #define V_icmp6errpps_count VNET(icmp6errpps_count) 1351e77c105SRobert Watson #define V_icmp6errppslim_last VNET(icmp6errppslim_last) 13682cea7e6SBjoern A. Zeeb #define V_icmp6_nodeinfo VNET(icmp6_nodeinfo) 13744e33a07SMarko Zec 13849dc650cSAndrey V. Elsukov static void icmp6_errcount(int, int); 1399233d8f3SDavid E. O'Brien static int icmp6_rip6_input(struct mbuf **, int); 1409233d8f3SDavid E. O'Brien static int icmp6_ratelimit(const struct in6_addr *, const int, const int); 1416f56329aSXin LI static const char *icmp6_redirect_diag(struct in6_addr *, 1426f56329aSXin LI struct in6_addr *, struct in6_addr *); 1437460ef5dSHiroki Sato static struct mbuf *ni6_input(struct mbuf *, int, struct prison *); 1449233d8f3SDavid E. O'Brien static struct mbuf *ni6_nametodns(const char *, int, int); 1459233d8f3SDavid E. O'Brien static int ni6_dnsmatch(const char *, int, const char *, int); 1466f56329aSXin LI static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *, 1476f56329aSXin LI struct ifnet **, struct in6_addr *); 1486f56329aSXin LI static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 1496f56329aSXin LI struct ifnet *, int); 1509233d8f3SDavid E. O'Brien static int icmp6_notify_error(struct mbuf **, int, int, int); 15182cd038dSYoshinobu Inoue 152315e3e38SRobert Watson /* 153315e3e38SRobert Watson * Kernel module interface for updating icmp6stat. The argument is an index 154315e3e38SRobert Watson * into icmp6stat treated as an array of u_quad_t. While this encodes the 155315e3e38SRobert Watson * general layout of icmp6stat into the caller, it doesn't encode its 156315e3e38SRobert Watson * location, so that future changes to add, for example, per-CPU stats 157315e3e38SRobert Watson * support won't cause binary compatibility problems for kernel modules. 158315e3e38SRobert Watson */ 159315e3e38SRobert Watson void 160315e3e38SRobert Watson kmod_icmp6stat_inc(int statnum) 161315e3e38SRobert Watson { 162315e3e38SRobert Watson 163a786f679SAndrey V. Elsukov counter_u64_add(VNET(icmp6stat)[statnum], 1); 164315e3e38SRobert Watson } 165315e3e38SRobert Watson 166686cdd19SJun-ichiro itojun Hagino static void 16749dc650cSAndrey V. Elsukov icmp6_errcount(int type, int code) 168686cdd19SJun-ichiro itojun Hagino { 169686cdd19SJun-ichiro itojun Hagino switch (type) { 170686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH: 171686cdd19SJun-ichiro itojun Hagino switch (code) { 172686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_NOROUTE: 17349dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_odst_unreach_noroute); 174686cdd19SJun-ichiro itojun Hagino return; 175686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_ADMIN: 17649dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_odst_unreach_admin); 177686cdd19SJun-ichiro itojun Hagino return; 178686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_BEYONDSCOPE: 17949dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_odst_unreach_beyondscope); 180686cdd19SJun-ichiro itojun Hagino return; 181686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_ADDR: 18249dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_odst_unreach_addr); 183686cdd19SJun-ichiro itojun Hagino return; 184686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_NOPORT: 18549dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_odst_unreach_noport); 186686cdd19SJun-ichiro itojun Hagino return; 187686cdd19SJun-ichiro itojun Hagino } 188686cdd19SJun-ichiro itojun Hagino break; 189686cdd19SJun-ichiro itojun Hagino case ICMP6_PACKET_TOO_BIG: 19049dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_opacket_too_big); 191686cdd19SJun-ichiro itojun Hagino return; 192686cdd19SJun-ichiro itojun Hagino case ICMP6_TIME_EXCEEDED: 193686cdd19SJun-ichiro itojun Hagino switch (code) { 194686cdd19SJun-ichiro itojun Hagino case ICMP6_TIME_EXCEED_TRANSIT: 19549dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_otime_exceed_transit); 196686cdd19SJun-ichiro itojun Hagino return; 197686cdd19SJun-ichiro itojun Hagino case ICMP6_TIME_EXCEED_REASSEMBLY: 19849dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_otime_exceed_reassembly); 199686cdd19SJun-ichiro itojun Hagino return; 200686cdd19SJun-ichiro itojun Hagino } 201686cdd19SJun-ichiro itojun Hagino break; 202686cdd19SJun-ichiro itojun Hagino case ICMP6_PARAM_PROB: 203686cdd19SJun-ichiro itojun Hagino switch (code) { 204686cdd19SJun-ichiro itojun Hagino case ICMP6_PARAMPROB_HEADER: 20549dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_oparamprob_header); 206686cdd19SJun-ichiro itojun Hagino return; 207686cdd19SJun-ichiro itojun Hagino case ICMP6_PARAMPROB_NEXTHEADER: 20849dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_oparamprob_nextheader); 209686cdd19SJun-ichiro itojun Hagino return; 210686cdd19SJun-ichiro itojun Hagino case ICMP6_PARAMPROB_OPTION: 21149dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_oparamprob_option); 212686cdd19SJun-ichiro itojun Hagino return; 213686cdd19SJun-ichiro itojun Hagino } 214686cdd19SJun-ichiro itojun Hagino break; 215686cdd19SJun-ichiro itojun Hagino case ND_REDIRECT: 21649dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_oredirect); 217686cdd19SJun-ichiro itojun Hagino return; 218686cdd19SJun-ichiro itojun Hagino } 21949dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_ounknown); 220686cdd19SJun-ichiro itojun Hagino } 221686cdd19SJun-ichiro itojun Hagino 22282cd038dSYoshinobu Inoue /* 223a1f7e5f8SHajimu UMEMOTO * A wrapper function for icmp6_error() necessary when the erroneous packet 224a1f7e5f8SHajimu UMEMOTO * may not contain enough scope zone information. 225a1f7e5f8SHajimu UMEMOTO */ 226a1f7e5f8SHajimu UMEMOTO void 2271272577eSXin LI icmp6_error2(struct mbuf *m, int type, int code, int param, 2281272577eSXin LI struct ifnet *ifp) 229a1f7e5f8SHajimu UMEMOTO { 230a1f7e5f8SHajimu UMEMOTO struct ip6_hdr *ip6; 231a1f7e5f8SHajimu UMEMOTO 232a1f7e5f8SHajimu UMEMOTO if (ifp == NULL) 233a1f7e5f8SHajimu UMEMOTO return; 234a1f7e5f8SHajimu UMEMOTO 235a1f7e5f8SHajimu UMEMOTO #ifndef PULLDOWN_TEST 236a1f7e5f8SHajimu UMEMOTO IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 237a1f7e5f8SHajimu UMEMOTO #else 238a1f7e5f8SHajimu UMEMOTO if (m->m_len < sizeof(struct ip6_hdr)) { 239a1f7e5f8SHajimu UMEMOTO m = m_pullup(m, sizeof(struct ip6_hdr)); 240a1f7e5f8SHajimu UMEMOTO if (m == NULL) 241a1f7e5f8SHajimu UMEMOTO return; 242a1f7e5f8SHajimu UMEMOTO } 243a1f7e5f8SHajimu UMEMOTO #endif 244a1f7e5f8SHajimu UMEMOTO 245a1f7e5f8SHajimu UMEMOTO ip6 = mtod(m, struct ip6_hdr *); 246a1f7e5f8SHajimu UMEMOTO 247a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) 248a1f7e5f8SHajimu UMEMOTO return; 249a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 250a1f7e5f8SHajimu UMEMOTO return; 251a1f7e5f8SHajimu UMEMOTO 252a1f7e5f8SHajimu UMEMOTO icmp6_error(m, type, code, param); 253a1f7e5f8SHajimu UMEMOTO } 254a1f7e5f8SHajimu UMEMOTO 255a1f7e5f8SHajimu UMEMOTO /* 25682cd038dSYoshinobu Inoue * Generate an error packet of type error in response to bad IP6 packet. 25782cd038dSYoshinobu Inoue */ 25882cd038dSYoshinobu Inoue void 2591272577eSXin LI icmp6_error(struct mbuf *m, int type, int code, int param) 26082cd038dSYoshinobu Inoue { 26182cd038dSYoshinobu Inoue struct ip6_hdr *oip6, *nip6; 26282cd038dSYoshinobu Inoue struct icmp6_hdr *icmp6; 263686cdd19SJun-ichiro itojun Hagino u_int preplen; 26482cd038dSYoshinobu Inoue int off; 265686cdd19SJun-ichiro itojun Hagino int nxt; 26682cd038dSYoshinobu Inoue 267e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_error); 26882cd038dSYoshinobu Inoue 269686cdd19SJun-ichiro itojun Hagino /* count per-type-code statistics */ 27049dc650cSAndrey V. Elsukov icmp6_errcount(type, code); 27182cd038dSYoshinobu Inoue 272686cdd19SJun-ichiro itojun Hagino #ifdef M_DECRYPTED /*not openbsd*/ 273686cdd19SJun-ichiro itojun Hagino if (m->m_flags & M_DECRYPTED) { 274e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_canterror); 275686cdd19SJun-ichiro itojun Hagino goto freeit; 276686cdd19SJun-ichiro itojun Hagino } 277686cdd19SJun-ichiro itojun Hagino #endif 278686cdd19SJun-ichiro itojun Hagino 279686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 280686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 281686cdd19SJun-ichiro itojun Hagino #else 282686cdd19SJun-ichiro itojun Hagino if (m->m_len < sizeof(struct ip6_hdr)) { 283686cdd19SJun-ichiro itojun Hagino m = m_pullup(m, sizeof(struct ip6_hdr)); 284686cdd19SJun-ichiro itojun Hagino if (m == NULL) 285686cdd19SJun-ichiro itojun Hagino return; 286686cdd19SJun-ichiro itojun Hagino } 287686cdd19SJun-ichiro itojun Hagino #endif 28882cd038dSYoshinobu Inoue oip6 = mtod(m, struct ip6_hdr *); 28982cd038dSYoshinobu Inoue 29082cd038dSYoshinobu Inoue /* 291f95d4633SHajimu UMEMOTO * If the destination address of the erroneous packet is a multicast 292f95d4633SHajimu UMEMOTO * address, or the packet was sent using link-layer multicast, 293f95d4633SHajimu UMEMOTO * we should basically suppress sending an error (RFC 2463, Section 294f95d4633SHajimu UMEMOTO * 2.4). 295f95d4633SHajimu UMEMOTO * We have two exceptions (the item e.2 in that section): 2961767c520SBjoern A. Zeeb * - the Packet Too Big message can be sent for path MTU discovery. 297f95d4633SHajimu UMEMOTO * - the Parameter Problem Message that can be allowed an icmp6 error 298f95d4633SHajimu UMEMOTO * in the option type field. This check has been done in 299f95d4633SHajimu UMEMOTO * ip6_unknown_opt(), so we can just check the type and code. 30082cd038dSYoshinobu Inoue */ 30182cd038dSYoshinobu Inoue if ((m->m_flags & (M_BCAST|M_MCAST) || 30282cd038dSYoshinobu Inoue IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 30382cd038dSYoshinobu Inoue (type != ICMP6_PACKET_TOO_BIG && 30482cd038dSYoshinobu Inoue (type != ICMP6_PARAM_PROB || 30582cd038dSYoshinobu Inoue code != ICMP6_PARAMPROB_OPTION))) 30682cd038dSYoshinobu Inoue goto freeit; 30782cd038dSYoshinobu Inoue 308f95d4633SHajimu UMEMOTO /* 309f95d4633SHajimu UMEMOTO * RFC 2463, 2.4 (e.5): source address check. 310f95d4633SHajimu UMEMOTO * XXX: the case of anycast source? 311f95d4633SHajimu UMEMOTO */ 31282cd038dSYoshinobu Inoue if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 31382cd038dSYoshinobu Inoue IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 31482cd038dSYoshinobu Inoue goto freeit; 31582cd038dSYoshinobu Inoue 31682cd038dSYoshinobu Inoue /* 317686cdd19SJun-ichiro itojun Hagino * If we are about to send ICMPv6 against ICMPv6 error/redirect, 318686cdd19SJun-ichiro itojun Hagino * don't do it. 31982cd038dSYoshinobu Inoue */ 320686cdd19SJun-ichiro itojun Hagino nxt = -1; 321686cdd19SJun-ichiro itojun Hagino off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 322686cdd19SJun-ichiro itojun Hagino if (off >= 0 && nxt == IPPROTO_ICMPV6) { 32382cd038dSYoshinobu Inoue struct icmp6_hdr *icp; 32482cd038dSYoshinobu Inoue 325686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 32682cd038dSYoshinobu Inoue IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), ); 32782cd038dSYoshinobu Inoue icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 328686cdd19SJun-ichiro itojun Hagino #else 329686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 330686cdd19SJun-ichiro itojun Hagino sizeof(*icp)); 331686cdd19SJun-ichiro itojun Hagino if (icp == NULL) { 332e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 333686cdd19SJun-ichiro itojun Hagino return; 334686cdd19SJun-ichiro itojun Hagino } 335686cdd19SJun-ichiro itojun Hagino #endif 336686cdd19SJun-ichiro itojun Hagino if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 337686cdd19SJun-ichiro itojun Hagino icp->icmp6_type == ND_REDIRECT) { 33882cd038dSYoshinobu Inoue /* 33982cd038dSYoshinobu Inoue * ICMPv6 error 34082cd038dSYoshinobu Inoue * Special case: for redirect (which is 34182cd038dSYoshinobu Inoue * informational) we must not send icmp6 error. 34282cd038dSYoshinobu Inoue */ 343e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_canterror); 34482cd038dSYoshinobu Inoue goto freeit; 34582cd038dSYoshinobu Inoue } else { 346686cdd19SJun-ichiro itojun Hagino /* ICMPv6 informational - send the error */ 34782cd038dSYoshinobu Inoue } 348686cdd19SJun-ichiro itojun Hagino } else { 349686cdd19SJun-ichiro itojun Hagino /* non-ICMPv6 - send the error */ 35082cd038dSYoshinobu Inoue } 35182cd038dSYoshinobu Inoue 35282cd038dSYoshinobu Inoue oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 35382cd038dSYoshinobu Inoue 35482cd038dSYoshinobu Inoue /* Finally, do rate limitation check. */ 35582cd038dSYoshinobu Inoue if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 356e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_toofreq); 35782cd038dSYoshinobu Inoue goto freeit; 35882cd038dSYoshinobu Inoue } 35982cd038dSYoshinobu Inoue 36082cd038dSYoshinobu Inoue /* 36182cd038dSYoshinobu Inoue * OK, ICMP6 can be generated. 36282cd038dSYoshinobu Inoue */ 36382cd038dSYoshinobu Inoue 36482cd038dSYoshinobu Inoue if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 36582cd038dSYoshinobu Inoue m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 36682cd038dSYoshinobu Inoue 367686cdd19SJun-ichiro itojun Hagino preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 368eb1b1807SGleb Smirnoff M_PREPEND(m, preplen, M_NOWAIT); /* FIB is also copied over. */ 36982cd038dSYoshinobu Inoue if (m == NULL) { 37033841545SHajimu UMEMOTO nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__)); 37182cd038dSYoshinobu Inoue return; 37282cd038dSYoshinobu Inoue } 37382cd038dSYoshinobu Inoue 37482cd038dSYoshinobu Inoue nip6 = mtod(m, struct ip6_hdr *); 37582cd038dSYoshinobu Inoue nip6->ip6_src = oip6->ip6_src; 37682cd038dSYoshinobu Inoue nip6->ip6_dst = oip6->ip6_dst; 37782cd038dSYoshinobu Inoue 3789a4f9608SHajimu UMEMOTO in6_clearscope(&oip6->ip6_src); 3799a4f9608SHajimu UMEMOTO in6_clearscope(&oip6->ip6_dst); 38082cd038dSYoshinobu Inoue 38182cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)(nip6 + 1); 38282cd038dSYoshinobu Inoue icmp6->icmp6_type = type; 38382cd038dSYoshinobu Inoue icmp6->icmp6_code = code; 38482cd038dSYoshinobu Inoue icmp6->icmp6_pptr = htonl((u_int32_t)param); 38582cd038dSYoshinobu Inoue 386e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_outhist[type]); 38782cd038dSYoshinobu Inoue icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 388686cdd19SJun-ichiro itojun Hagino 389686cdd19SJun-ichiro itojun Hagino return; 390686cdd19SJun-ichiro itojun Hagino 391686cdd19SJun-ichiro itojun Hagino freeit: 392686cdd19SJun-ichiro itojun Hagino /* 393cd0fdcf7SHajimu UMEMOTO * If we can't tell whether or not we can generate ICMP6, free it. 394686cdd19SJun-ichiro itojun Hagino */ 395686cdd19SJun-ichiro itojun Hagino m_freem(m); 39682cd038dSYoshinobu Inoue } 39782cd038dSYoshinobu Inoue 39882cd038dSYoshinobu Inoue /* 39982cd038dSYoshinobu Inoue * Process a received ICMP6 message. 40082cd038dSYoshinobu Inoue */ 40182cd038dSYoshinobu Inoue int 4021272577eSXin LI icmp6_input(struct mbuf **mp, int *offp, int proto) 40382cd038dSYoshinobu Inoue { 404503f4e47SBjoern A. Zeeb struct mbuf *m, *n; 40529dc7bc6SBruce M Simpson struct ifnet *ifp; 40682cd038dSYoshinobu Inoue struct ip6_hdr *ip6, *nip6; 40782cd038dSYoshinobu Inoue struct icmp6_hdr *icmp6, *nicmp6; 4081d54aa3bSBjoern A. Zeeb char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 409503f4e47SBjoern A. Zeeb int code, error, icmp6len, ip6len, noff, off, sum; 41082cd038dSYoshinobu Inoue 411503f4e47SBjoern A. Zeeb m = *mp; 412503f4e47SBjoern A. Zeeb off = *offp; 41329dc7bc6SBruce M Simpson 414686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 41582cd038dSYoshinobu Inoue IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE); 41682cd038dSYoshinobu Inoue /* m might change if M_LOOP. So, call mtod after this */ 417686cdd19SJun-ichiro itojun Hagino #endif 41882cd038dSYoshinobu Inoue 41982cd038dSYoshinobu Inoue /* 42082cd038dSYoshinobu Inoue * Locate icmp6 structure in mbuf, and check 42182cd038dSYoshinobu Inoue * that not corrupted and of at least minimum length 42282cd038dSYoshinobu Inoue */ 42382cd038dSYoshinobu Inoue 424503f4e47SBjoern A. Zeeb icmp6len = m->m_pkthdr.len - off; 42582cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct icmp6_hdr)) { 426e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 42782cd038dSYoshinobu Inoue goto freeit; 42882cd038dSYoshinobu Inoue } 42982cd038dSYoshinobu Inoue 430503f4e47SBjoern A. Zeeb ip6 = mtod(m, struct ip6_hdr *); 431503f4e47SBjoern A. Zeeb ifp = m->m_pkthdr.rcvif; 43282cd038dSYoshinobu Inoue /* 43333cde130SBruce M Simpson * Check multicast group membership. 43433cde130SBruce M Simpson * Note: SSM filters are not applied for ICMPv6 traffic. 43533cde130SBruce M Simpson */ 43633cde130SBruce M Simpson if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 43733cde130SBruce M Simpson struct in6_multi *inm; 43833cde130SBruce M Simpson 43933cde130SBruce M Simpson inm = in6m_lookup(ifp, &ip6->ip6_dst); 44033cde130SBruce M Simpson if (inm == NULL) { 44133cde130SBruce M Simpson IP6STAT_INC(ip6s_notmember); 44233cde130SBruce M Simpson in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 44333cde130SBruce M Simpson goto freeit; 44433cde130SBruce M Simpson } 44533cde130SBruce M Simpson } 44633cde130SBruce M Simpson 447503f4e47SBjoern A. Zeeb /* Calculate the checksum. */ 448686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 44982cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 450686cdd19SJun-ichiro itojun Hagino #else 451686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 452686cdd19SJun-ichiro itojun Hagino if (icmp6 == NULL) { 453e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 454686cdd19SJun-ichiro itojun Hagino return IPPROTO_DONE; 455686cdd19SJun-ichiro itojun Hagino } 456686cdd19SJun-ichiro itojun Hagino #endif 45782cd038dSYoshinobu Inoue code = icmp6->icmp6_code; 45882cd038dSYoshinobu Inoue 45982cd038dSYoshinobu Inoue if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 46033841545SHajimu UMEMOTO nd6log((LOG_ERR, 46182cd038dSYoshinobu Inoue "ICMP6 checksum error(%d|%x) %s\n", 4621d54aa3bSBjoern A. Zeeb icmp6->icmp6_type, sum, 4631d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6bufs, &ip6->ip6_src))); 464e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_checksum); 46582cd038dSYoshinobu Inoue goto freeit; 46682cd038dSYoshinobu Inoue } 46782cd038dSYoshinobu Inoue 468e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_inhist[icmp6->icmp6_type]); 46929dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_msg); 47082cd038dSYoshinobu Inoue if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 47129dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_error); 47282cd038dSYoshinobu Inoue 473503f4e47SBjoern A. Zeeb ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen); 47482cd038dSYoshinobu Inoue switch (icmp6->icmp6_type) { 47582cd038dSYoshinobu Inoue case ICMP6_DST_UNREACH: 47629dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_dstunreach); 47782cd038dSYoshinobu Inoue switch (code) { 47882cd038dSYoshinobu Inoue case ICMP6_DST_UNREACH_NOROUTE: 479d4c22202SAndrew Gallatin case ICMP6_DST_UNREACH_ADDR: /* PRC_HOSTDEAD is a DOS */ 48082cd038dSYoshinobu Inoue code = PRC_UNREACH_NET; 48182cd038dSYoshinobu Inoue break; 48282cd038dSYoshinobu Inoue case ICMP6_DST_UNREACH_ADMIN: 48329dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_adminprohib); 4843e146575SMichael Tuexen code = PRC_UNREACH_ADMIN_PROHIB; 48582cd038dSYoshinobu Inoue break; 486686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_BEYONDSCOPE: 487686cdd19SJun-ichiro itojun Hagino /* I mean "source address was incorrect." */ 488686cdd19SJun-ichiro itojun Hagino code = PRC_PARAMPROB; 489686cdd19SJun-ichiro itojun Hagino break; 49082cd038dSYoshinobu Inoue case ICMP6_DST_UNREACH_NOPORT: 49182cd038dSYoshinobu Inoue code = PRC_UNREACH_PORT; 49282cd038dSYoshinobu Inoue break; 49382cd038dSYoshinobu Inoue default: 49482cd038dSYoshinobu Inoue goto badcode; 49582cd038dSYoshinobu Inoue } 49682cd038dSYoshinobu Inoue goto deliver; 49782cd038dSYoshinobu Inoue break; 49882cd038dSYoshinobu Inoue 49982cd038dSYoshinobu Inoue case ICMP6_PACKET_TOO_BIG: 50029dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_pkttoobig); 50182cd038dSYoshinobu Inoue 502aaff9927SHajimu UMEMOTO /* validation is made in icmp6_mtudisc_update */ 503aaff9927SHajimu UMEMOTO 50482cd038dSYoshinobu Inoue code = PRC_MSGSIZE; 50582cd038dSYoshinobu Inoue 506686cdd19SJun-ichiro itojun Hagino /* 507686cdd19SJun-ichiro itojun Hagino * Updating the path MTU will be done after examining 508686cdd19SJun-ichiro itojun Hagino * intermediate extension headers. 509686cdd19SJun-ichiro itojun Hagino */ 51082cd038dSYoshinobu Inoue goto deliver; 51182cd038dSYoshinobu Inoue break; 51282cd038dSYoshinobu Inoue 51382cd038dSYoshinobu Inoue case ICMP6_TIME_EXCEEDED: 51429dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_timeexceed); 51582cd038dSYoshinobu Inoue switch (code) { 51682cd038dSYoshinobu Inoue case ICMP6_TIME_EXCEED_TRANSIT: 5172ce62dceSSUZUKI Shinsuke code = PRC_TIMXCEED_INTRANS; 5182ce62dceSSUZUKI Shinsuke break; 51982cd038dSYoshinobu Inoue case ICMP6_TIME_EXCEED_REASSEMBLY: 5202ce62dceSSUZUKI Shinsuke code = PRC_TIMXCEED_REASS; 52182cd038dSYoshinobu Inoue break; 52282cd038dSYoshinobu Inoue default: 52382cd038dSYoshinobu Inoue goto badcode; 52482cd038dSYoshinobu Inoue } 52582cd038dSYoshinobu Inoue goto deliver; 52682cd038dSYoshinobu Inoue break; 52782cd038dSYoshinobu Inoue 52882cd038dSYoshinobu Inoue case ICMP6_PARAM_PROB: 52929dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_paramprob); 53082cd038dSYoshinobu Inoue switch (code) { 53182cd038dSYoshinobu Inoue case ICMP6_PARAMPROB_NEXTHEADER: 53282cd038dSYoshinobu Inoue code = PRC_UNREACH_PROTOCOL; 53382cd038dSYoshinobu Inoue break; 53482cd038dSYoshinobu Inoue case ICMP6_PARAMPROB_HEADER: 53582cd038dSYoshinobu Inoue case ICMP6_PARAMPROB_OPTION: 53682cd038dSYoshinobu Inoue code = PRC_PARAMPROB; 53782cd038dSYoshinobu Inoue break; 53882cd038dSYoshinobu Inoue default: 53982cd038dSYoshinobu Inoue goto badcode; 54082cd038dSYoshinobu Inoue } 54182cd038dSYoshinobu Inoue goto deliver; 54282cd038dSYoshinobu Inoue break; 54382cd038dSYoshinobu Inoue 54482cd038dSYoshinobu Inoue case ICMP6_ECHO_REQUEST: 54529dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_echo); 54682cd038dSYoshinobu Inoue if (code != 0) 54782cd038dSYoshinobu Inoue goto badcode; 548c3bef61eSKevin Lo if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 54982cd038dSYoshinobu Inoue /* Give up remote */ 55082cd038dSYoshinobu Inoue break; 55182cd038dSYoshinobu Inoue } 552f0cace5dSRobert Watson if (!M_WRITABLE(n) 553686cdd19SJun-ichiro itojun Hagino || n->m_len < off + sizeof(struct icmp6_hdr)) { 55482cd038dSYoshinobu Inoue struct mbuf *n0 = n; 5552268ca47SSam Leffler int n0len; 55682cd038dSYoshinobu Inoue 55710e5acc3SGleb Smirnoff CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) <= MHLEN); 5587b07d1beSGleb Smirnoff n = m_gethdr(M_NOWAIT, n0->m_type); 55982cd038dSYoshinobu Inoue if (n == NULL) { 56082cd038dSYoshinobu Inoue /* Give up remote */ 56182cd038dSYoshinobu Inoue m_freem(n0); 56282cd038dSYoshinobu Inoue break; 56382cd038dSYoshinobu Inoue } 56410e5acc3SGleb Smirnoff 56510e5acc3SGleb Smirnoff m_move_pkthdr(n, n0); /* FIB copied. */ 56610e5acc3SGleb Smirnoff n0len = n0->m_pkthdr.len; /* save for use below */ 56782cd038dSYoshinobu Inoue /* 56882cd038dSYoshinobu Inoue * Copy IPv6 and ICMPv6 only. 56982cd038dSYoshinobu Inoue */ 57082cd038dSYoshinobu Inoue nip6 = mtod(n, struct ip6_hdr *); 57182cd038dSYoshinobu Inoue bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 57282cd038dSYoshinobu Inoue nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 57382cd038dSYoshinobu Inoue bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 57482cd038dSYoshinobu Inoue noff = sizeof(struct ip6_hdr); 5752268ca47SSam Leffler /* new mbuf contains only ipv6+icmpv6 headers */ 5762268ca47SSam Leffler n->m_len = noff + sizeof(struct icmp6_hdr); 577686cdd19SJun-ichiro itojun Hagino /* 578686cdd19SJun-ichiro itojun Hagino * Adjust mbuf. ip6_plen will be adjusted in 579686cdd19SJun-ichiro itojun Hagino * ip6_output(). 580686cdd19SJun-ichiro itojun Hagino */ 581686cdd19SJun-ichiro itojun Hagino m_adj(n0, off + sizeof(struct icmp6_hdr)); 5822268ca47SSam Leffler /* recalculate complete packet size */ 5832268ca47SSam Leffler n->m_pkthdr.len = n0len + (noff - off); 584686cdd19SJun-ichiro itojun Hagino n->m_next = n0; 58582cd038dSYoshinobu Inoue } else { 5866a550ab3SHajimu UMEMOTO IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 5876a550ab3SHajimu UMEMOTO sizeof(*nicmp6)); 58882cd038dSYoshinobu Inoue noff = off; 58982cd038dSYoshinobu Inoue } 590fb043945SJonathan T. Looney if (n) { 59182cd038dSYoshinobu Inoue nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 59282cd038dSYoshinobu Inoue nicmp6->icmp6_code = 0; 593e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_reflect); 594e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_outhist[ICMP6_ECHO_REPLY]); 59582cd038dSYoshinobu Inoue icmp6_reflect(n, noff); 59682cd038dSYoshinobu Inoue } 59782cd038dSYoshinobu Inoue break; 59882cd038dSYoshinobu Inoue 59982cd038dSYoshinobu Inoue case ICMP6_ECHO_REPLY: 60029dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_echoreply); 60182cd038dSYoshinobu Inoue if (code != 0) 60282cd038dSYoshinobu Inoue goto badcode; 60382cd038dSYoshinobu Inoue break; 60482cd038dSYoshinobu Inoue 60581170631SHajimu UMEMOTO case MLD_LISTENER_QUERY: 60681170631SHajimu UMEMOTO case MLD_LISTENER_REPORT: 60733cde130SBruce M Simpson case MLD_LISTENER_DONE: 60833cde130SBruce M Simpson case MLDV2_LISTENER_REPORT: 60933cde130SBruce M Simpson /* 61029dc7bc6SBruce M Simpson * Drop MLD traffic which is not link-local, has a hop limit 61129dc7bc6SBruce M Simpson * of greater than 1 hop, or which does not have the 61229dc7bc6SBruce M Simpson * IPv6 HBH Router Alert option. 61329dc7bc6SBruce M Simpson * As IPv6 HBH options are stripped in ip6_input() we must 61429dc7bc6SBruce M Simpson * check an mbuf header flag. 61533cde130SBruce M Simpson * XXX Should we also sanity check that these messages 61633cde130SBruce M Simpson * were directed to a link-local multicast prefix? 61733cde130SBruce M Simpson */ 61829dc7bc6SBruce M Simpson if ((ip6->ip6_hlim != 1) || (m->m_flags & M_RTALERT_MLD) == 0) 619686cdd19SJun-ichiro itojun Hagino goto freeit; 62033cde130SBruce M Simpson if (mld_input(m, off, icmp6len) != 0) 62133cde130SBruce M Simpson return (IPPROTO_DONE); 62282cd038dSYoshinobu Inoue /* m stays. */ 62382cd038dSYoshinobu Inoue break; 62482cd038dSYoshinobu Inoue 62582cd038dSYoshinobu Inoue case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 62682cd038dSYoshinobu Inoue { 62782cd038dSYoshinobu Inoue enum { WRU, FQDN } mode; 6287460ef5dSHiroki Sato struct prison *pr; 62982cd038dSYoshinobu Inoue 630603724d3SBjoern A. Zeeb if (!V_icmp6_nodeinfo) 631686cdd19SJun-ichiro itojun Hagino break; 632686cdd19SJun-ichiro itojun Hagino 63382cd038dSYoshinobu Inoue if (icmp6len == sizeof(struct icmp6_hdr) + 4) 63482cd038dSYoshinobu Inoue mode = WRU; 635686cdd19SJun-ichiro itojun Hagino else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 63682cd038dSYoshinobu Inoue mode = FQDN; 63782cd038dSYoshinobu Inoue else 63882cd038dSYoshinobu Inoue goto badlen; 63982cd038dSYoshinobu Inoue 6407460ef5dSHiroki Sato pr = NULL; 6417460ef5dSHiroki Sato sx_slock(&allprison_lock); 6427460ef5dSHiroki Sato TAILQ_FOREACH(pr, &allprison, pr_list) 6437460ef5dSHiroki Sato if (pr->pr_vnet == ifp->if_vnet) 6447460ef5dSHiroki Sato break; 6457460ef5dSHiroki Sato sx_sunlock(&allprison_lock); 6467460ef5dSHiroki Sato if (pr == NULL) 6477460ef5dSHiroki Sato pr = curthread->td_ucred->cr_prison; 64882cd038dSYoshinobu Inoue if (mode == FQDN) { 649686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 65082cd038dSYoshinobu Inoue IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), 65182cd038dSYoshinobu Inoue IPPROTO_DONE); 652686cdd19SJun-ichiro itojun Hagino #endif 653c3bef61eSKevin Lo n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 654686cdd19SJun-ichiro itojun Hagino if (n) 6557460ef5dSHiroki Sato n = ni6_input(n, off, pr); 656686cdd19SJun-ichiro itojun Hagino /* XXX meaningless if n == NULL */ 65782cd038dSYoshinobu Inoue noff = sizeof(struct ip6_hdr); 65882cd038dSYoshinobu Inoue } else { 65982cd038dSYoshinobu Inoue u_char *p; 66010e5acc3SGleb Smirnoff int maxhlen, hlen; 66182cd038dSYoshinobu Inoue 66218706985SJINMEI Tatuya /* 66318706985SJINMEI Tatuya * XXX: this combination of flags is pointless, 66418706985SJINMEI Tatuya * but should we keep this for compatibility? 66518706985SJINMEI Tatuya */ 666c81c183dSMark Johnston if ((V_icmp6_nodeinfo & (ICMP6_NODEINFO_FQDNOK | 667c81c183dSMark Johnston ICMP6_NODEINFO_TMPADDROK)) != 668c81c183dSMark Johnston (ICMP6_NODEINFO_FQDNOK | ICMP6_NODEINFO_TMPADDROK)) 66933841545SHajimu UMEMOTO break; 67033841545SHajimu UMEMOTO 671686cdd19SJun-ichiro itojun Hagino if (code != 0) 672686cdd19SJun-ichiro itojun Hagino goto badcode; 67310e5acc3SGleb Smirnoff 67410e5acc3SGleb Smirnoff CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) + 4 <= MHLEN); 67510e5acc3SGleb Smirnoff n = m_gethdr(M_NOWAIT, m->m_type); 67610e5acc3SGleb Smirnoff if (n == NULL) { 677686cdd19SJun-ichiro itojun Hagino /* Give up remote */ 678686cdd19SJun-ichiro itojun Hagino break; 679686cdd19SJun-ichiro itojun Hagino } 68010e5acc3SGleb Smirnoff if (!m_dup_pkthdr(n, m, M_NOWAIT)) { 6819967cafcSSam Leffler /* 6829967cafcSSam Leffler * Previous code did a blind M_COPY_PKTHDR 6839967cafcSSam Leffler * and said "just for rcvif". If true, then 6849967cafcSSam Leffler * we could tolerate the dup failing (due to 6859967cafcSSam Leffler * the deep copy of the tag chain). For now 6869967cafcSSam Leffler * be conservative and just fail. 6879967cafcSSam Leffler */ 6889967cafcSSam Leffler m_free(n); 6899967cafcSSam Leffler n = NULL; 690fb043945SJonathan T. Looney break; 6919967cafcSSam Leffler } 69282cd038dSYoshinobu Inoue /* 69382cd038dSYoshinobu Inoue * Copy IPv6 and ICMPv6 only. 69482cd038dSYoshinobu Inoue */ 69582cd038dSYoshinobu Inoue nip6 = mtod(n, struct ip6_hdr *); 69682cd038dSYoshinobu Inoue bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 69782cd038dSYoshinobu Inoue nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 69882cd038dSYoshinobu Inoue bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 69982cd038dSYoshinobu Inoue p = (u_char *)(nicmp6 + 1); 70082cd038dSYoshinobu Inoue bzero(p, 4); 7017460ef5dSHiroki Sato 7027460ef5dSHiroki Sato maxhlen = M_TRAILINGSPACE(n) - 7037460ef5dSHiroki Sato (sizeof(*nip6) + sizeof(*nicmp6) + 4); 7047460ef5dSHiroki Sato mtx_lock(&pr->pr_mtx); 7057460ef5dSHiroki Sato hlen = strlen(pr->pr_hostname); 7067460ef5dSHiroki Sato if (maxhlen > hlen) 7077460ef5dSHiroki Sato maxhlen = hlen; 708c1f19219SJamie Gritton /* meaningless TTL */ 709c1f19219SJamie Gritton bcopy(pr->pr_hostname, p + 4, maxhlen); 71076ca6f88SJamie Gritton mtx_unlock(&pr->pr_mtx); 71182cd038dSYoshinobu Inoue noff = sizeof(struct ip6_hdr); 71282cd038dSYoshinobu Inoue n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 713686cdd19SJun-ichiro itojun Hagino sizeof(struct icmp6_hdr) + 4 + maxhlen; 71482cd038dSYoshinobu Inoue nicmp6->icmp6_type = ICMP6_WRUREPLY; 71582cd038dSYoshinobu Inoue nicmp6->icmp6_code = 0; 71682cd038dSYoshinobu Inoue } 71782cd038dSYoshinobu Inoue if (n) { 718e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_reflect); 719e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_outhist[ICMP6_WRUREPLY]); 72082cd038dSYoshinobu Inoue icmp6_reflect(n, noff); 72182cd038dSYoshinobu Inoue } 72282cd038dSYoshinobu Inoue break; 72382cd038dSYoshinobu Inoue } 72482cd038dSYoshinobu Inoue 72582cd038dSYoshinobu Inoue case ICMP6_WRUREPLY: 72682cd038dSYoshinobu Inoue if (code != 0) 72782cd038dSYoshinobu Inoue goto badcode; 72882cd038dSYoshinobu Inoue break; 72982cd038dSYoshinobu Inoue 73082cd038dSYoshinobu Inoue case ND_ROUTER_SOLICIT: 73129dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_routersolicit); 73282cd038dSYoshinobu Inoue if (code != 0) 73382cd038dSYoshinobu Inoue goto badcode; 73482cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_router_solicit)) 73582cd038dSYoshinobu Inoue goto badlen; 7361db8d1f8SAna Kukec if (send_sendso_input_hook != NULL) { 7372d12d25cSMark Johnston IP6_EXTHDR_CHECK(m, off, icmp6len, IPPROTO_DONE); 7382d12d25cSMark Johnston error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); 7392d12d25cSMark Johnston if (error == 0) { 740686cdd19SJun-ichiro itojun Hagino m = NULL; 741686cdd19SJun-ichiro itojun Hagino goto freeit; 742686cdd19SJun-ichiro itojun Hagino } 7432d12d25cSMark Johnston } 7442d12d25cSMark Johnston n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 7452d12d25cSMark Johnston nd6_rs_input(m, off, icmp6len); 7462d12d25cSMark Johnston m = n; 7472d12d25cSMark Johnston if (m == NULL) 748e7a6db74SAna Kukec goto freeit; 74982cd038dSYoshinobu Inoue break; 75082cd038dSYoshinobu Inoue 75182cd038dSYoshinobu Inoue case ND_ROUTER_ADVERT: 75229dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_routeradvert); 75382cd038dSYoshinobu Inoue if (code != 0) 75482cd038dSYoshinobu Inoue goto badcode; 75582cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_router_advert)) 75682cd038dSYoshinobu Inoue goto badlen; 7571db8d1f8SAna Kukec if (send_sendso_input_hook != NULL) { 7582d12d25cSMark Johnston error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); 7592d12d25cSMark Johnston if (error == 0) { 760686cdd19SJun-ichiro itojun Hagino m = NULL; 761686cdd19SJun-ichiro itojun Hagino goto freeit; 762686cdd19SJun-ichiro itojun Hagino } 7632d12d25cSMark Johnston } 7642d12d25cSMark Johnston n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 7652d12d25cSMark Johnston nd6_ra_input(m, off, icmp6len); 7662d12d25cSMark Johnston m = n; 7672d12d25cSMark Johnston if (m == NULL) 768e7a6db74SAna Kukec goto freeit; 76982cd038dSYoshinobu Inoue break; 77082cd038dSYoshinobu Inoue 77182cd038dSYoshinobu Inoue case ND_NEIGHBOR_SOLICIT: 77229dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_neighborsolicit); 77382cd038dSYoshinobu Inoue if (code != 0) 77482cd038dSYoshinobu Inoue goto badcode; 77582cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_neighbor_solicit)) 77682cd038dSYoshinobu Inoue goto badlen; 7771db8d1f8SAna Kukec if (send_sendso_input_hook != NULL) { 7782d12d25cSMark Johnston error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); 7792d12d25cSMark Johnston if (error == 0) { 780686cdd19SJun-ichiro itojun Hagino m = NULL; 781686cdd19SJun-ichiro itojun Hagino goto freeit; 782686cdd19SJun-ichiro itojun Hagino } 7832d12d25cSMark Johnston } 7842d12d25cSMark Johnston n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 7852d12d25cSMark Johnston nd6_ns_input(m, off, icmp6len); 7862d12d25cSMark Johnston m = n; 7872d12d25cSMark Johnston if (m == NULL) 788e7a6db74SAna Kukec goto freeit; 78982cd038dSYoshinobu Inoue break; 79082cd038dSYoshinobu Inoue 79182cd038dSYoshinobu Inoue case ND_NEIGHBOR_ADVERT: 79229dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_neighboradvert); 79382cd038dSYoshinobu Inoue if (code != 0) 79482cd038dSYoshinobu Inoue goto badcode; 79582cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_neighbor_advert)) 79682cd038dSYoshinobu Inoue goto badlen; 7971db8d1f8SAna Kukec if (send_sendso_input_hook != NULL) { 7982d12d25cSMark Johnston error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); 7992d12d25cSMark Johnston if (error == 0) { 800686cdd19SJun-ichiro itojun Hagino m = NULL; 801686cdd19SJun-ichiro itojun Hagino goto freeit; 802686cdd19SJun-ichiro itojun Hagino } 8032d12d25cSMark Johnston } 8042d12d25cSMark Johnston n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 8052d12d25cSMark Johnston nd6_na_input(m, off, icmp6len); 8062d12d25cSMark Johnston m = n; 8072d12d25cSMark Johnston if (m == NULL) 808e7a6db74SAna Kukec goto freeit; 80982cd038dSYoshinobu Inoue break; 81082cd038dSYoshinobu Inoue 81182cd038dSYoshinobu Inoue case ND_REDIRECT: 81229dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_redirect); 81382cd038dSYoshinobu Inoue if (code != 0) 81482cd038dSYoshinobu Inoue goto badcode; 81582cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_redirect)) 81682cd038dSYoshinobu Inoue goto badlen; 8171db8d1f8SAna Kukec if (send_sendso_input_hook != NULL) { 8182d12d25cSMark Johnston error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); 8192d12d25cSMark Johnston if (error == 0) { 820686cdd19SJun-ichiro itojun Hagino m = NULL; 821686cdd19SJun-ichiro itojun Hagino goto freeit; 822686cdd19SJun-ichiro itojun Hagino } 8232d12d25cSMark Johnston } 8242d12d25cSMark Johnston n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 8252d12d25cSMark Johnston icmp6_redirect_input(m, off); 8262d12d25cSMark Johnston m = n; 8272d12d25cSMark Johnston if (m == NULL) 828e7a6db74SAna Kukec goto freeit; 82982cd038dSYoshinobu Inoue break; 83082cd038dSYoshinobu Inoue 83182cd038dSYoshinobu Inoue case ICMP6_ROUTER_RENUMBERING: 83282cd038dSYoshinobu Inoue if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 83382cd038dSYoshinobu Inoue code != ICMP6_ROUTER_RENUMBERING_RESULT) 83482cd038dSYoshinobu Inoue goto badcode; 83582cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct icmp6_router_renum)) 83682cd038dSYoshinobu Inoue goto badlen; 83782cd038dSYoshinobu Inoue break; 83882cd038dSYoshinobu Inoue 83982cd038dSYoshinobu Inoue default: 84033841545SHajimu UMEMOTO nd6log((LOG_DEBUG, 84133841545SHajimu UMEMOTO "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 8421d54aa3bSBjoern A. Zeeb icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src), 8431d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6bufd, &ip6->ip6_dst), 84429dc7bc6SBruce M Simpson ifp ? ifp->if_index : 0)); 84582cd038dSYoshinobu Inoue if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 84682cd038dSYoshinobu Inoue /* ICMPv6 error: MUST deliver it by spec... */ 84782cd038dSYoshinobu Inoue code = PRC_NCMDS; 84882cd038dSYoshinobu Inoue /* deliver */ 84982cd038dSYoshinobu Inoue } else { 85082cd038dSYoshinobu Inoue /* ICMPv6 informational: MUST not deliver */ 85182cd038dSYoshinobu Inoue break; 85282cd038dSYoshinobu Inoue } 85382cd038dSYoshinobu Inoue deliver: 85414c129fcSBjoern A. Zeeb if (icmp6_notify_error(&m, off, icmp6len, code) != 0) { 85533841545SHajimu UMEMOTO /* In this case, m should've been freed. */ 85633841545SHajimu UMEMOTO return (IPPROTO_DONE); 85733841545SHajimu UMEMOTO } 85833841545SHajimu UMEMOTO break; 85933841545SHajimu UMEMOTO 86033841545SHajimu UMEMOTO badcode: 861e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_badcode); 86233841545SHajimu UMEMOTO break; 86333841545SHajimu UMEMOTO 86433841545SHajimu UMEMOTO badlen: 865e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_badlen); 86633841545SHajimu UMEMOTO break; 86733841545SHajimu UMEMOTO } 86833841545SHajimu UMEMOTO 86933841545SHajimu UMEMOTO /* deliver the packet to appropriate sockets */ 87033841545SHajimu UMEMOTO icmp6_rip6_input(&m, *offp); 87133841545SHajimu UMEMOTO 87233841545SHajimu UMEMOTO return IPPROTO_DONE; 87333841545SHajimu UMEMOTO 87433841545SHajimu UMEMOTO freeit: 87533841545SHajimu UMEMOTO m_freem(m); 87633841545SHajimu UMEMOTO return IPPROTO_DONE; 87733841545SHajimu UMEMOTO } 87833841545SHajimu UMEMOTO 87933841545SHajimu UMEMOTO static int 8801272577eSXin LI icmp6_notify_error(struct mbuf **mp, int off, int icmp6len, int code) 88133841545SHajimu UMEMOTO { 882503f4e47SBjoern A. Zeeb struct mbuf *m; 88333841545SHajimu UMEMOTO struct icmp6_hdr *icmp6; 88433841545SHajimu UMEMOTO struct ip6_hdr *eip6; 88533841545SHajimu UMEMOTO u_int32_t notifymtu; 88633841545SHajimu UMEMOTO struct sockaddr_in6 icmp6src, icmp6dst; 88733841545SHajimu UMEMOTO 888503f4e47SBjoern A. Zeeb m = *mp; 889503f4e47SBjoern A. Zeeb 89082cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 891e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 89282cd038dSYoshinobu Inoue goto freeit; 89382cd038dSYoshinobu Inoue } 894686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 89582cd038dSYoshinobu Inoue IP6_EXTHDR_CHECK(m, off, 89606cd0a3fSHajimu UMEMOTO sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1); 89782cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 898686cdd19SJun-ichiro itojun Hagino #else 899686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 900686cdd19SJun-ichiro itojun Hagino sizeof(*icmp6) + sizeof(struct ip6_hdr)); 901686cdd19SJun-ichiro itojun Hagino if (icmp6 == NULL) { 902e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 90333841545SHajimu UMEMOTO return (-1); 904686cdd19SJun-ichiro itojun Hagino } 905686cdd19SJun-ichiro itojun Hagino #endif 90633841545SHajimu UMEMOTO eip6 = (struct ip6_hdr *)(icmp6 + 1); 90782cd038dSYoshinobu Inoue 90882cd038dSYoshinobu Inoue /* Detect the upper level protocol */ 90982cd038dSYoshinobu Inoue { 9109233d8f3SDavid E. O'Brien void (*ctlfunc)(int, struct sockaddr *, void *); 91182cd038dSYoshinobu Inoue u_int8_t nxt = eip6->ip6_nxt; 91282cd038dSYoshinobu Inoue int eoff = off + sizeof(struct icmp6_hdr) + 91382cd038dSYoshinobu Inoue sizeof(struct ip6_hdr); 91482cd038dSYoshinobu Inoue struct ip6ctlparam ip6cp; 915686cdd19SJun-ichiro itojun Hagino struct in6_addr *finaldst = NULL; 916686cdd19SJun-ichiro itojun Hagino int icmp6type = icmp6->icmp6_type; 917686cdd19SJun-ichiro itojun Hagino struct ip6_frag *fh; 918686cdd19SJun-ichiro itojun Hagino struct ip6_rthdr *rth; 919686cdd19SJun-ichiro itojun Hagino struct ip6_rthdr0 *rth0; 920686cdd19SJun-ichiro itojun Hagino int rthlen; 92182cd038dSYoshinobu Inoue 92288ff5695SSUZUKI Shinsuke while (1) { /* XXX: should avoid infinite loop explicitly? */ 92382cd038dSYoshinobu Inoue struct ip6_ext *eh; 92482cd038dSYoshinobu Inoue 92582cd038dSYoshinobu Inoue switch (nxt) { 92682cd038dSYoshinobu Inoue case IPPROTO_HOPOPTS: 92782cd038dSYoshinobu Inoue case IPPROTO_DSTOPTS: 92882cd038dSYoshinobu Inoue case IPPROTO_AH: 929686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 93006cd0a3fSHajimu UMEMOTO IP6_EXTHDR_CHECK(m, 0, 93106cd0a3fSHajimu UMEMOTO eoff + sizeof(struct ip6_ext), -1); 9320527d333SHajimu UMEMOTO eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff); 933686cdd19SJun-ichiro itojun Hagino #else 934686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 935686cdd19SJun-ichiro itojun Hagino eoff, sizeof(*eh)); 936686cdd19SJun-ichiro itojun Hagino if (eh == NULL) { 937e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 93833841545SHajimu UMEMOTO return (-1); 939686cdd19SJun-ichiro itojun Hagino } 940686cdd19SJun-ichiro itojun Hagino #endif 941686cdd19SJun-ichiro itojun Hagino 94282cd038dSYoshinobu Inoue if (nxt == IPPROTO_AH) 94382cd038dSYoshinobu Inoue eoff += (eh->ip6e_len + 2) << 2; 94482cd038dSYoshinobu Inoue else 94582cd038dSYoshinobu Inoue eoff += (eh->ip6e_len + 1) << 3; 94682cd038dSYoshinobu Inoue nxt = eh->ip6e_nxt; 94782cd038dSYoshinobu Inoue break; 948686cdd19SJun-ichiro itojun Hagino case IPPROTO_ROUTING: 949686cdd19SJun-ichiro itojun Hagino /* 950686cdd19SJun-ichiro itojun Hagino * When the erroneous packet contains a 951686cdd19SJun-ichiro itojun Hagino * routing header, we should examine the 952686cdd19SJun-ichiro itojun Hagino * header to determine the final destination. 953686cdd19SJun-ichiro itojun Hagino * Otherwise, we can't properly update 954686cdd19SJun-ichiro itojun Hagino * information that depends on the final 955686cdd19SJun-ichiro itojun Hagino * destination (e.g. path MTU). 956686cdd19SJun-ichiro itojun Hagino */ 957686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 95806cd0a3fSHajimu UMEMOTO IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1); 95906cd0a3fSHajimu UMEMOTO rth = (struct ip6_rthdr *) 96006cd0a3fSHajimu UMEMOTO (mtod(m, caddr_t) + eoff); 961686cdd19SJun-ichiro itojun Hagino #else 962686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 963686cdd19SJun-ichiro itojun Hagino eoff, sizeof(*rth)); 964686cdd19SJun-ichiro itojun Hagino if (rth == NULL) { 965e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 96633841545SHajimu UMEMOTO return (-1); 967686cdd19SJun-ichiro itojun Hagino } 968686cdd19SJun-ichiro itojun Hagino #endif 969686cdd19SJun-ichiro itojun Hagino rthlen = (rth->ip6r_len + 1) << 3; 970686cdd19SJun-ichiro itojun Hagino /* 971686cdd19SJun-ichiro itojun Hagino * XXX: currently there is no 972686cdd19SJun-ichiro itojun Hagino * officially defined type other 973686cdd19SJun-ichiro itojun Hagino * than type-0. 974686cdd19SJun-ichiro itojun Hagino * Note that if the segment left field 975686cdd19SJun-ichiro itojun Hagino * is 0, all intermediate hops must 976686cdd19SJun-ichiro itojun Hagino * have been passed. 977686cdd19SJun-ichiro itojun Hagino */ 978686cdd19SJun-ichiro itojun Hagino if (rth->ip6r_segleft && 979686cdd19SJun-ichiro itojun Hagino rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 980686cdd19SJun-ichiro itojun Hagino int hops; 981686cdd19SJun-ichiro itojun Hagino 982686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 98306cd0a3fSHajimu UMEMOTO IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1); 98406cd0a3fSHajimu UMEMOTO rth0 = (struct ip6_rthdr0 *) 98506cd0a3fSHajimu UMEMOTO (mtod(m, caddr_t) + eoff); 986686cdd19SJun-ichiro itojun Hagino #else 987686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(rth0, 988686cdd19SJun-ichiro itojun Hagino struct ip6_rthdr0 *, m, 989686cdd19SJun-ichiro itojun Hagino eoff, rthlen); 990686cdd19SJun-ichiro itojun Hagino if (rth0 == NULL) { 991e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 99233841545SHajimu UMEMOTO return (-1); 993686cdd19SJun-ichiro itojun Hagino } 994686cdd19SJun-ichiro itojun Hagino #endif 995686cdd19SJun-ichiro itojun Hagino /* just ignore a bogus header */ 996686cdd19SJun-ichiro itojun Hagino if ((rth0->ip6r0_len % 2) == 0 && 997686cdd19SJun-ichiro itojun Hagino (hops = rth0->ip6r0_len/2)) 998686cdd19SJun-ichiro itojun Hagino finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 999686cdd19SJun-ichiro itojun Hagino } 1000686cdd19SJun-ichiro itojun Hagino eoff += rthlen; 1001686cdd19SJun-ichiro itojun Hagino nxt = rth->ip6r_nxt; 1002686cdd19SJun-ichiro itojun Hagino break; 1003686cdd19SJun-ichiro itojun Hagino case IPPROTO_FRAGMENT: 1004686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 1005686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_CHECK(m, 0, eoff + 100606cd0a3fSHajimu UMEMOTO sizeof(struct ip6_frag), -1); 100706cd0a3fSHajimu UMEMOTO fh = (struct ip6_frag *)(mtod(m, caddr_t) + 100806cd0a3fSHajimu UMEMOTO eoff); 1009686cdd19SJun-ichiro itojun Hagino #else 1010686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1011686cdd19SJun-ichiro itojun Hagino eoff, sizeof(*fh)); 1012686cdd19SJun-ichiro itojun Hagino if (fh == NULL) { 1013e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 101433841545SHajimu UMEMOTO return (-1); 1015686cdd19SJun-ichiro itojun Hagino } 1016686cdd19SJun-ichiro itojun Hagino #endif 1017686cdd19SJun-ichiro itojun Hagino /* 1018686cdd19SJun-ichiro itojun Hagino * Data after a fragment header is meaningless 1019686cdd19SJun-ichiro itojun Hagino * unless it is the first fragment, but 1020686cdd19SJun-ichiro itojun Hagino * we'll go to the notify label for path MTU 1021686cdd19SJun-ichiro itojun Hagino * discovery. 1022686cdd19SJun-ichiro itojun Hagino */ 1023686cdd19SJun-ichiro itojun Hagino if (fh->ip6f_offlg & IP6F_OFF_MASK) 1024686cdd19SJun-ichiro itojun Hagino goto notify; 1025686cdd19SJun-ichiro itojun Hagino 1026686cdd19SJun-ichiro itojun Hagino eoff += sizeof(struct ip6_frag); 1027686cdd19SJun-ichiro itojun Hagino nxt = fh->ip6f_nxt; 1028686cdd19SJun-ichiro itojun Hagino break; 102982cd038dSYoshinobu Inoue default: 1030686cdd19SJun-ichiro itojun Hagino /* 1031686cdd19SJun-ichiro itojun Hagino * This case includes ESP and the No Next 1032686cdd19SJun-ichiro itojun Hagino * Header. In such cases going to the notify 1033686cdd19SJun-ichiro itojun Hagino * label does not have any meaning 1034686cdd19SJun-ichiro itojun Hagino * (i.e. ctlfunc will be NULL), but we go 1035686cdd19SJun-ichiro itojun Hagino * anyway since we might have to update 1036686cdd19SJun-ichiro itojun Hagino * path MTU information. 1037686cdd19SJun-ichiro itojun Hagino */ 103882cd038dSYoshinobu Inoue goto notify; 103982cd038dSYoshinobu Inoue } 104082cd038dSYoshinobu Inoue } 104182cd038dSYoshinobu Inoue notify: 1042686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 104382cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 1044686cdd19SJun-ichiro itojun Hagino #else 1045686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1046686cdd19SJun-ichiro itojun Hagino sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1047686cdd19SJun-ichiro itojun Hagino if (icmp6 == NULL) { 1048e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 104933841545SHajimu UMEMOTO return (-1); 1050686cdd19SJun-ichiro itojun Hagino } 1051686cdd19SJun-ichiro itojun Hagino #endif 105233841545SHajimu UMEMOTO 105306cd0a3fSHajimu UMEMOTO /* 105406cd0a3fSHajimu UMEMOTO * retrieve parameters from the inner IPv6 header, and convert 105506cd0a3fSHajimu UMEMOTO * them into sockaddr structures. 105606cd0a3fSHajimu UMEMOTO * XXX: there is no guarantee that the source or destination 105706cd0a3fSHajimu UMEMOTO * addresses of the inner packet are in the same scope as 105806cd0a3fSHajimu UMEMOTO * the addresses of the icmp packet. But there is no other 105906cd0a3fSHajimu UMEMOTO * way to determine the zone. 106006cd0a3fSHajimu UMEMOTO */ 106133841545SHajimu UMEMOTO eip6 = (struct ip6_hdr *)(icmp6 + 1); 106206cd0a3fSHajimu UMEMOTO 106333841545SHajimu UMEMOTO bzero(&icmp6dst, sizeof(icmp6dst)); 106433841545SHajimu UMEMOTO icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 106533841545SHajimu UMEMOTO icmp6dst.sin6_family = AF_INET6; 1066686cdd19SJun-ichiro itojun Hagino if (finaldst == NULL) 106733841545SHajimu UMEMOTO icmp6dst.sin6_addr = eip6->ip6_dst; 106833841545SHajimu UMEMOTO else 106933841545SHajimu UMEMOTO icmp6dst.sin6_addr = *finaldst; 1070a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL)) 10719a4f9608SHajimu UMEMOTO goto freeit; 107233841545SHajimu UMEMOTO bzero(&icmp6src, sizeof(icmp6src)); 107333841545SHajimu UMEMOTO icmp6src.sin6_len = sizeof(struct sockaddr_in6); 107433841545SHajimu UMEMOTO icmp6src.sin6_family = AF_INET6; 107533841545SHajimu UMEMOTO icmp6src.sin6_addr = eip6->ip6_src; 1076a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL)) 10779a4f9608SHajimu UMEMOTO goto freeit; 1078a1f7e5f8SHajimu UMEMOTO icmp6src.sin6_flowinfo = 1079a1f7e5f8SHajimu UMEMOTO (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 108033841545SHajimu UMEMOTO 108133841545SHajimu UMEMOTO if (finaldst == NULL) 108233841545SHajimu UMEMOTO finaldst = &eip6->ip6_dst; 108333841545SHajimu UMEMOTO ip6cp.ip6c_m = m; 108433841545SHajimu UMEMOTO ip6cp.ip6c_icmp6 = icmp6; 108533841545SHajimu UMEMOTO ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 108633841545SHajimu UMEMOTO ip6cp.ip6c_off = eoff; 108733841545SHajimu UMEMOTO ip6cp.ip6c_finaldst = finaldst; 108833841545SHajimu UMEMOTO ip6cp.ip6c_src = &icmp6src; 108933841545SHajimu UMEMOTO ip6cp.ip6c_nxt = nxt; 109033841545SHajimu UMEMOTO 109133841545SHajimu UMEMOTO if (icmp6type == ICMP6_PACKET_TOO_BIG) { 109233841545SHajimu UMEMOTO notifymtu = ntohl(icmp6->icmp6_mtu); 109333841545SHajimu UMEMOTO ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 109433841545SHajimu UMEMOTO icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/ 1095686cdd19SJun-ichiro itojun Hagino } 1096686cdd19SJun-ichiro itojun Hagino 10979233d8f3SDavid E. O'Brien ctlfunc = (void (*)(int, struct sockaddr *, void *)) 109882cd038dSYoshinobu Inoue (inet6sw[ip6_protox[nxt]].pr_ctlinput); 109982cd038dSYoshinobu Inoue if (ctlfunc) { 110033841545SHajimu UMEMOTO (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, 110133841545SHajimu UMEMOTO &ip6cp); 110282cd038dSYoshinobu Inoue } 110382cd038dSYoshinobu Inoue } 11049c0fda72SHajimu UMEMOTO *mp = m; 110533841545SHajimu UMEMOTO return (0); 110682cd038dSYoshinobu Inoue 110782cd038dSYoshinobu Inoue freeit: 110882cd038dSYoshinobu Inoue m_freem(m); 110933841545SHajimu UMEMOTO return (-1); 111082cd038dSYoshinobu Inoue } 111182cd038dSYoshinobu Inoue 111233841545SHajimu UMEMOTO void 11131272577eSXin LI icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1114686cdd19SJun-ichiro itojun Hagino { 111533841545SHajimu UMEMOTO struct in6_addr *dst = ip6cp->ip6c_finaldst; 111633841545SHajimu UMEMOTO struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 111733841545SHajimu UMEMOTO struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1118686cdd19SJun-ichiro itojun Hagino u_int mtu = ntohl(icmp6->icmp6_mtu); 111997d8d152SAndre Oppermann struct in_conninfo inc; 1120686cdd19SJun-ichiro itojun Hagino 1121f95d4633SHajimu UMEMOTO #if 0 1122f95d4633SHajimu UMEMOTO /* 1123f95d4633SHajimu UMEMOTO * RFC2460 section 5, last paragraph. 1124f95d4633SHajimu UMEMOTO * even though minimum link MTU for IPv6 is IPV6_MMTU, 1125f95d4633SHajimu UMEMOTO * we may see ICMPv6 too big with mtu < IPV6_MMTU 1126f95d4633SHajimu UMEMOTO * due to packet translator in the middle. 1127f95d4633SHajimu UMEMOTO * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for 1128f95d4633SHajimu UMEMOTO * special handling. 1129f95d4633SHajimu UMEMOTO */ 1130f95d4633SHajimu UMEMOTO if (mtu < IPV6_MMTU) 1131f95d4633SHajimu UMEMOTO return; 1132f95d4633SHajimu UMEMOTO #endif 1133f95d4633SHajimu UMEMOTO 1134f95d4633SHajimu UMEMOTO /* 1135f95d4633SHajimu UMEMOTO * we reject ICMPv6 too big with abnormally small value. 1136f95d4633SHajimu UMEMOTO * XXX what is the good definition of "abnormally small"? 1137f95d4633SHajimu UMEMOTO */ 1138f95d4633SHajimu UMEMOTO if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1139f95d4633SHajimu UMEMOTO return; 1140f95d4633SHajimu UMEMOTO 114133841545SHajimu UMEMOTO if (!validated) 114233841545SHajimu UMEMOTO return; 114333841545SHajimu UMEMOTO 114459ca51adSSimon L. B. Nielsen /* 114559ca51adSSimon L. B. Nielsen * In case the suggested mtu is less than IPV6_MMTU, we 114659ca51adSSimon L. B. Nielsen * only need to remember that it was for above mentioned 114759ca51adSSimon L. B. Nielsen * "alwaysfrag" case. 114859ca51adSSimon L. B. Nielsen * Try to be as close to the spec as possible. 114959ca51adSSimon L. B. Nielsen */ 115059ca51adSSimon L. B. Nielsen if (mtu < IPV6_MMTU) 115159ca51adSSimon L. B. Nielsen mtu = IPV6_MMTU - 8; 115259ca51adSSimon L. B. Nielsen 115397d8d152SAndre Oppermann bzero(&inc, sizeof(inc)); 1154baa09f18SAndrey V. Elsukov inc.inc_fibnum = M_GETFIB(m); 1155dcdb4371SBjoern A. Zeeb inc.inc_flags |= INC_ISIPV6; 115697d8d152SAndre Oppermann inc.inc6_faddr = *dst; 1157a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL)) 1158a1f7e5f8SHajimu UMEMOTO return; 1159686cdd19SJun-ichiro itojun Hagino 1160233dcce1SAndre Oppermann if (mtu < tcp_maxmtu6(&inc, NULL)) { 116197d8d152SAndre Oppermann tcp_hc_updatemtu(&inc, mtu); 1162e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_pmtuchg); 1163686cdd19SJun-ichiro itojun Hagino } 1164686cdd19SJun-ichiro itojun Hagino } 1165686cdd19SJun-ichiro itojun Hagino 116682cd038dSYoshinobu Inoue /* 116733841545SHajimu UMEMOTO * Process a Node Information Query packet, based on 116833841545SHajimu UMEMOTO * draft-ietf-ipngwg-icmp-name-lookups-07. 1169686cdd19SJun-ichiro itojun Hagino * 1170686cdd19SJun-ichiro itojun Hagino * Spec incompatibilities: 1171686cdd19SJun-ichiro itojun Hagino * - IPv6 Subject address handling 1172686cdd19SJun-ichiro itojun Hagino * - IPv4 Subject address handling support missing 1173686cdd19SJun-ichiro itojun Hagino * - Proxy reply (answer even if it's not for me) 1174686cdd19SJun-ichiro itojun Hagino * - joins NI group address at in6_ifattach() time only, does not cope 1175686cdd19SJun-ichiro itojun Hagino * with hostname changes by sethostname(3) 117682cd038dSYoshinobu Inoue */ 117782cd038dSYoshinobu Inoue static struct mbuf * 11787460ef5dSHiroki Sato ni6_input(struct mbuf *m, int off, struct prison *pr) 117982cd038dSYoshinobu Inoue { 1180686cdd19SJun-ichiro itojun Hagino struct icmp6_nodeinfo *ni6, *nni6; 118182cd038dSYoshinobu Inoue struct mbuf *n = NULL; 1182686cdd19SJun-ichiro itojun Hagino u_int16_t qtype; 1183686cdd19SJun-ichiro itojun Hagino int subjlen; 118482cd038dSYoshinobu Inoue int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 118582cd038dSYoshinobu Inoue struct ni_reply_fqdn *fqdn; 118682cd038dSYoshinobu Inoue int addrs; /* for NI_QTYPE_NODEADDR */ 118782cd038dSYoshinobu Inoue struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1188a1f7e5f8SHajimu UMEMOTO struct in6_addr in6_subj; /* subject address */ 1189686cdd19SJun-ichiro itojun Hagino struct ip6_hdr *ip6; 1190686cdd19SJun-ichiro itojun Hagino int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 119133841545SHajimu UMEMOTO char *subj = NULL; 119233841545SHajimu UMEMOTO struct in6_ifaddr *ia6 = NULL; 119382cd038dSYoshinobu Inoue 1194686cdd19SJun-ichiro itojun Hagino ip6 = mtod(m, struct ip6_hdr *); 1195686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 1196686cdd19SJun-ichiro itojun Hagino ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 1197686cdd19SJun-ichiro itojun Hagino #else 1198686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1199686cdd19SJun-ichiro itojun Hagino if (ni6 == NULL) { 1200686cdd19SJun-ichiro itojun Hagino /* m is already reclaimed */ 120106cd0a3fSHajimu UMEMOTO return (NULL); 1202686cdd19SJun-ichiro itojun Hagino } 1203686cdd19SJun-ichiro itojun Hagino #endif 1204686cdd19SJun-ichiro itojun Hagino 1205686cdd19SJun-ichiro itojun Hagino /* 120618706985SJINMEI Tatuya * Validate IPv6 source address. 120718706985SJINMEI Tatuya * The default configuration MUST be to refuse answering queries from 120818706985SJINMEI Tatuya * global-scope addresses according to RFC4602. 120918706985SJINMEI Tatuya * Notes: 121018706985SJINMEI Tatuya * - it's not very clear what "refuse" means; this implementation 121118706985SJINMEI Tatuya * simply drops it. 121218706985SJINMEI Tatuya * - it's not very easy to identify global-scope (unicast) addresses 121318706985SJINMEI Tatuya * since there are many prefixes for them. It should be safer 121418706985SJINMEI Tatuya * and in practice sufficient to check "all" but loopback and 121518706985SJINMEI Tatuya * link-local (note that site-local unicast was deprecated and 121618706985SJINMEI Tatuya * ULA is defined as global scope-wise) 121718706985SJINMEI Tatuya */ 1218603724d3SBjoern A. Zeeb if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 && 121918706985SJINMEI Tatuya !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) && 122018706985SJINMEI Tatuya !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 122118706985SJINMEI Tatuya goto bad; 122218706985SJINMEI Tatuya 122318706985SJINMEI Tatuya /* 1224686cdd19SJun-ichiro itojun Hagino * Validate IPv6 destination address. 1225686cdd19SJun-ichiro itojun Hagino * 122633841545SHajimu UMEMOTO * The Responder must discard the Query without further processing 122733841545SHajimu UMEMOTO * unless it is one of the Responder's unicast or anycast addresses, or 122833841545SHajimu UMEMOTO * a link-local scope multicast address which the Responder has joined. 122918706985SJINMEI Tatuya * [RFC4602, Section 5.] 1230686cdd19SJun-ichiro itojun Hagino */ 12312a5aafceSHajimu UMEMOTO if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 12322a5aafceSHajimu UMEMOTO if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 12332a5aafceSHajimu UMEMOTO goto bad; 12342a5aafceSHajimu UMEMOTO /* else it's a link-local multicast, fine */ 12352a5aafceSHajimu UMEMOTO } else { /* unicast or anycast */ 12363e88eb90SAndrey V. Elsukov ia6 = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */); 12373e88eb90SAndrey V. Elsukov if (ia6 == NULL) 12382a5aafceSHajimu UMEMOTO goto bad; /* XXX impossible */ 12392a5aafceSHajimu UMEMOTO 12402a5aafceSHajimu UMEMOTO if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) && 1241603724d3SBjoern A. Zeeb !(V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) { 12428c0fec80SRobert Watson ifa_free(&ia6->ia_ifa); 124333841545SHajimu UMEMOTO nd6log((LOG_DEBUG, "ni6_input: ignore node info to " 124433841545SHajimu UMEMOTO "a temporary address in %s:%d", 124533841545SHajimu UMEMOTO __FILE__, __LINE__)); 124633841545SHajimu UMEMOTO goto bad; 124733841545SHajimu UMEMOTO } 12488c0fec80SRobert Watson ifa_free(&ia6->ia_ifa); 12492a5aafceSHajimu UMEMOTO } 1250686cdd19SJun-ichiro itojun Hagino 1251686cdd19SJun-ichiro itojun Hagino /* validate query Subject field. */ 125233841545SHajimu UMEMOTO qtype = ntohs(ni6->ni_qtype); 1253686cdd19SJun-ichiro itojun Hagino subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1254686cdd19SJun-ichiro itojun Hagino switch (qtype) { 1255686cdd19SJun-ichiro itojun Hagino case NI_QTYPE_NOOP: 1256686cdd19SJun-ichiro itojun Hagino case NI_QTYPE_SUPTYPES: 125733841545SHajimu UMEMOTO /* 07 draft */ 125833841545SHajimu UMEMOTO if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1259686cdd19SJun-ichiro itojun Hagino break; 126033841545SHajimu UMEMOTO /* FALLTHROUGH */ 1261686cdd19SJun-ichiro itojun Hagino case NI_QTYPE_FQDN: 1262686cdd19SJun-ichiro itojun Hagino case NI_QTYPE_NODEADDR: 1263a22adbc6SSUZUKI Shinsuke case NI_QTYPE_IPV4ADDR: 1264686cdd19SJun-ichiro itojun Hagino switch (ni6->ni_code) { 1265686cdd19SJun-ichiro itojun Hagino case ICMP6_NI_SUBJ_IPV6: 1266686cdd19SJun-ichiro itojun Hagino #if ICMP6_NI_SUBJ_IPV6 != 0 1267686cdd19SJun-ichiro itojun Hagino case 0: 1268686cdd19SJun-ichiro itojun Hagino #endif 1269686cdd19SJun-ichiro itojun Hagino /* 1270686cdd19SJun-ichiro itojun Hagino * backward compatibility - try to accept 03 draft 1271686cdd19SJun-ichiro itojun Hagino * format, where no Subject is present. 1272686cdd19SJun-ichiro itojun Hagino */ 127333841545SHajimu UMEMOTO if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 127433841545SHajimu UMEMOTO subjlen == 0) { 1275686cdd19SJun-ichiro itojun Hagino oldfqdn++; 1276686cdd19SJun-ichiro itojun Hagino break; 1277686cdd19SJun-ichiro itojun Hagino } 127833841545SHajimu UMEMOTO #if ICMP6_NI_SUBJ_IPV6 != 0 127933841545SHajimu UMEMOTO if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 128033841545SHajimu UMEMOTO goto bad; 128133841545SHajimu UMEMOTO #endif 1282686cdd19SJun-ichiro itojun Hagino 12832a5aafceSHajimu UMEMOTO if (subjlen != sizeof(struct in6_addr)) 1284686cdd19SJun-ichiro itojun Hagino goto bad; 1285686cdd19SJun-ichiro itojun Hagino 1286686cdd19SJun-ichiro itojun Hagino /* 1287686cdd19SJun-ichiro itojun Hagino * Validate Subject address. 1288686cdd19SJun-ichiro itojun Hagino * 128933841545SHajimu UMEMOTO * Not sure what exactly "address belongs to the node" 129033841545SHajimu UMEMOTO * means in the spec, is it just unicast, or what? 1291686cdd19SJun-ichiro itojun Hagino * 1292686cdd19SJun-ichiro itojun Hagino * At this moment we consider Subject address as 1293686cdd19SJun-ichiro itojun Hagino * "belong to the node" if the Subject address equals 1294686cdd19SJun-ichiro itojun Hagino * to the IPv6 destination address; validation for 1295686cdd19SJun-ichiro itojun Hagino * IPv6 destination address should have done enough 1296686cdd19SJun-ichiro itojun Hagino * check for us. 1297686cdd19SJun-ichiro itojun Hagino * 1298686cdd19SJun-ichiro itojun Hagino * We do not do proxy at this moment. 1299686cdd19SJun-ichiro itojun Hagino */ 1300686cdd19SJun-ichiro itojun Hagino /* m_pulldown instead of copy? */ 1301686cdd19SJun-ichiro itojun Hagino m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1302a1f7e5f8SHajimu UMEMOTO subjlen, (caddr_t)&in6_subj); 1303a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL)) 13049a4f9608SHajimu UMEMOTO goto bad; 13052a5aafceSHajimu UMEMOTO 1306a1f7e5f8SHajimu UMEMOTO subj = (char *)&in6_subj; 1307a1f7e5f8SHajimu UMEMOTO if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1308686cdd19SJun-ichiro itojun Hagino break; 130933841545SHajimu UMEMOTO 1310686cdd19SJun-ichiro itojun Hagino /* 1311686cdd19SJun-ichiro itojun Hagino * XXX if we are to allow other cases, we should really 1312686cdd19SJun-ichiro itojun Hagino * be careful about scope here. 1313686cdd19SJun-ichiro itojun Hagino * basically, we should disallow queries toward IPv6 131406cd0a3fSHajimu UMEMOTO * destination X with subject Y, 131506cd0a3fSHajimu UMEMOTO * if scope(X) > scope(Y). 1316686cdd19SJun-ichiro itojun Hagino * if we allow scope(X) > scope(Y), it will result in 1317686cdd19SJun-ichiro itojun Hagino * information leakage across scope boundary. 1318686cdd19SJun-ichiro itojun Hagino */ 1319686cdd19SJun-ichiro itojun Hagino goto bad; 1320686cdd19SJun-ichiro itojun Hagino 1321686cdd19SJun-ichiro itojun Hagino case ICMP6_NI_SUBJ_FQDN: 1322686cdd19SJun-ichiro itojun Hagino /* 1323686cdd19SJun-ichiro itojun Hagino * Validate Subject name with gethostname(3). 1324686cdd19SJun-ichiro itojun Hagino * 1325686cdd19SJun-ichiro itojun Hagino * The behavior may need some debate, since: 1326686cdd19SJun-ichiro itojun Hagino * - we are not sure if the node has FQDN as 1327686cdd19SJun-ichiro itojun Hagino * hostname (returned by gethostname(3)). 1328686cdd19SJun-ichiro itojun Hagino * - the code does wildcard match for truncated names. 1329686cdd19SJun-ichiro itojun Hagino * however, we are not sure if we want to perform 1330686cdd19SJun-ichiro itojun Hagino * wildcard match, if gethostname(3) side has 1331686cdd19SJun-ichiro itojun Hagino * truncated hostname. 1332686cdd19SJun-ichiro itojun Hagino */ 133376ca6f88SJamie Gritton mtx_lock(&pr->pr_mtx); 1334c1f19219SJamie Gritton n = ni6_nametodns(pr->pr_hostname, 1335c1f19219SJamie Gritton strlen(pr->pr_hostname), 0); 133676ca6f88SJamie Gritton mtx_unlock(&pr->pr_mtx); 1337686cdd19SJun-ichiro itojun Hagino if (!n || n->m_next || n->m_len == 0) 1338686cdd19SJun-ichiro itojun Hagino goto bad; 1339686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(subj, char *, m, 1340686cdd19SJun-ichiro itojun Hagino off + sizeof(struct icmp6_nodeinfo), subjlen); 1341686cdd19SJun-ichiro itojun Hagino if (subj == NULL) 1342686cdd19SJun-ichiro itojun Hagino goto bad; 1343686cdd19SJun-ichiro itojun Hagino if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1344686cdd19SJun-ichiro itojun Hagino n->m_len)) { 1345686cdd19SJun-ichiro itojun Hagino goto bad; 1346686cdd19SJun-ichiro itojun Hagino } 1347686cdd19SJun-ichiro itojun Hagino m_freem(n); 1348686cdd19SJun-ichiro itojun Hagino n = NULL; 1349686cdd19SJun-ichiro itojun Hagino break; 1350686cdd19SJun-ichiro itojun Hagino 135133841545SHajimu UMEMOTO case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1352686cdd19SJun-ichiro itojun Hagino default: 1353686cdd19SJun-ichiro itojun Hagino goto bad; 1354686cdd19SJun-ichiro itojun Hagino } 1355686cdd19SJun-ichiro itojun Hagino break; 1356686cdd19SJun-ichiro itojun Hagino } 1357686cdd19SJun-ichiro itojun Hagino 135833841545SHajimu UMEMOTO /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 135933841545SHajimu UMEMOTO switch (qtype) { 136033841545SHajimu UMEMOTO case NI_QTYPE_FQDN: 1361603724d3SBjoern A. Zeeb if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0) 136233841545SHajimu UMEMOTO goto bad; 136333841545SHajimu UMEMOTO break; 136433841545SHajimu UMEMOTO case NI_QTYPE_NODEADDR: 1365a22adbc6SSUZUKI Shinsuke case NI_QTYPE_IPV4ADDR: 1366603724d3SBjoern A. Zeeb if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0) 136733841545SHajimu UMEMOTO goto bad; 136833841545SHajimu UMEMOTO break; 136933841545SHajimu UMEMOTO } 137033841545SHajimu UMEMOTO 137133841545SHajimu UMEMOTO /* guess reply length */ 137233841545SHajimu UMEMOTO switch (qtype) { 137333841545SHajimu UMEMOTO case NI_QTYPE_NOOP: 137433841545SHajimu UMEMOTO break; /* no reply data */ 137533841545SHajimu UMEMOTO case NI_QTYPE_SUPTYPES: 137633841545SHajimu UMEMOTO replylen += sizeof(u_int32_t); 137733841545SHajimu UMEMOTO break; 137833841545SHajimu UMEMOTO case NI_QTYPE_FQDN: 137933841545SHajimu UMEMOTO /* XXX will append an mbuf */ 138033841545SHajimu UMEMOTO replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 138133841545SHajimu UMEMOTO break; 138233841545SHajimu UMEMOTO case NI_QTYPE_NODEADDR: 1383c66b5feaSHajimu UMEMOTO addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj); 138433841545SHajimu UMEMOTO if ((replylen += addrs * (sizeof(struct in6_addr) + 138533841545SHajimu UMEMOTO sizeof(u_int32_t))) > MCLBYTES) 138633841545SHajimu UMEMOTO replylen = MCLBYTES; /* XXX: will truncate pkt later */ 138733841545SHajimu UMEMOTO break; 1388a22adbc6SSUZUKI Shinsuke case NI_QTYPE_IPV4ADDR: 1389a22adbc6SSUZUKI Shinsuke /* unsupported - should respond with unknown Qtype? */ 1390a22adbc6SSUZUKI Shinsuke break; 139133841545SHajimu UMEMOTO default: 139233841545SHajimu UMEMOTO /* 139333841545SHajimu UMEMOTO * XXX: We must return a reply with the ICMP6 code 139433841545SHajimu UMEMOTO * `unknown Qtype' in this case. However we regard the case 139533841545SHajimu UMEMOTO * as an FQDN query for backward compatibility. 139633841545SHajimu UMEMOTO * Older versions set a random value to this field, 139733841545SHajimu UMEMOTO * so it rarely varies in the defined qtypes. 139833841545SHajimu UMEMOTO * But the mechanism is not reliable... 139933841545SHajimu UMEMOTO * maybe we should obsolete older versions. 140033841545SHajimu UMEMOTO */ 140133841545SHajimu UMEMOTO qtype = NI_QTYPE_FQDN; 140233841545SHajimu UMEMOTO /* XXX will append an mbuf */ 140333841545SHajimu UMEMOTO replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 140433841545SHajimu UMEMOTO oldfqdn++; 140533841545SHajimu UMEMOTO break; 140633841545SHajimu UMEMOTO } 140733841545SHajimu UMEMOTO 140810e5acc3SGleb Smirnoff /* Allocate an mbuf to reply. */ 1409686cdd19SJun-ichiro itojun Hagino if (replylen > MCLBYTES) { 141082cd038dSYoshinobu Inoue /* 141133841545SHajimu UMEMOTO * XXX: should we try to allocate more? But MCLBYTES 141233841545SHajimu UMEMOTO * is probably much larger than IPV6_MMTU... 141382cd038dSYoshinobu Inoue */ 141482cd038dSYoshinobu Inoue goto bad; 1415686cdd19SJun-ichiro itojun Hagino } 141610e5acc3SGleb Smirnoff if (replylen > MHLEN) 141710e5acc3SGleb Smirnoff n = m_getcl(M_NOWAIT, m->m_type, M_PKTHDR); 141810e5acc3SGleb Smirnoff else 141910e5acc3SGleb Smirnoff n = m_gethdr(M_NOWAIT, m->m_type); 142010e5acc3SGleb Smirnoff if (n == NULL) { 142110e5acc3SGleb Smirnoff m_freem(m); 142210e5acc3SGleb Smirnoff return (NULL); 142382cd038dSYoshinobu Inoue } 142410e5acc3SGleb Smirnoff m_move_pkthdr(n, m); /* just for recvif and FIB */ 142582cd038dSYoshinobu Inoue n->m_pkthdr.len = n->m_len = replylen; 142682cd038dSYoshinobu Inoue 142782cd038dSYoshinobu Inoue /* copy mbuf header and IPv6 + Node Information base headers */ 142882cd038dSYoshinobu Inoue bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 142982cd038dSYoshinobu Inoue nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1430686cdd19SJun-ichiro itojun Hagino bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 143182cd038dSYoshinobu Inoue 143282cd038dSYoshinobu Inoue /* qtype dependent procedure */ 143382cd038dSYoshinobu Inoue switch (qtype) { 143482cd038dSYoshinobu Inoue case NI_QTYPE_NOOP: 143533841545SHajimu UMEMOTO nni6->ni_code = ICMP6_NI_SUCCESS; 143682cd038dSYoshinobu Inoue nni6->ni_flags = 0; 143782cd038dSYoshinobu Inoue break; 143882cd038dSYoshinobu Inoue case NI_QTYPE_SUPTYPES: 143933841545SHajimu UMEMOTO { 144033841545SHajimu UMEMOTO u_int32_t v; 144133841545SHajimu UMEMOTO nni6->ni_code = ICMP6_NI_SUCCESS; 144233841545SHajimu UMEMOTO nni6->ni_flags = htons(0x0000); /* raw bitmap */ 144333841545SHajimu UMEMOTO /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 144433841545SHajimu UMEMOTO v = (u_int32_t)htonl(0x0000000f); 144533841545SHajimu UMEMOTO bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 144682cd038dSYoshinobu Inoue break; 144733841545SHajimu UMEMOTO } 144882cd038dSYoshinobu Inoue case NI_QTYPE_FQDN: 144933841545SHajimu UMEMOTO nni6->ni_code = ICMP6_NI_SUCCESS; 145082cd038dSYoshinobu Inoue fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 145106cd0a3fSHajimu UMEMOTO sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo)); 145282cd038dSYoshinobu Inoue nni6->ni_flags = 0; /* XXX: meaningless TTL */ 145382cd038dSYoshinobu Inoue fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1454686cdd19SJun-ichiro itojun Hagino /* 145576ca6f88SJamie Gritton * XXX do we really have FQDN in hostname? 1456686cdd19SJun-ichiro itojun Hagino */ 145776ca6f88SJamie Gritton mtx_lock(&pr->pr_mtx); 1458c1f19219SJamie Gritton n->m_next = ni6_nametodns(pr->pr_hostname, 1459c1f19219SJamie Gritton strlen(pr->pr_hostname), oldfqdn); 146076ca6f88SJamie Gritton mtx_unlock(&pr->pr_mtx); 1461686cdd19SJun-ichiro itojun Hagino if (n->m_next == NULL) 1462686cdd19SJun-ichiro itojun Hagino goto bad; 1463686cdd19SJun-ichiro itojun Hagino /* XXX we assume that n->m_next is not a chain */ 1464686cdd19SJun-ichiro itojun Hagino if (n->m_next->m_next != NULL) 1465686cdd19SJun-ichiro itojun Hagino goto bad; 1466686cdd19SJun-ichiro itojun Hagino n->m_pkthdr.len += n->m_next->m_len; 146782cd038dSYoshinobu Inoue break; 146882cd038dSYoshinobu Inoue case NI_QTYPE_NODEADDR: 146982cd038dSYoshinobu Inoue { 147082cd038dSYoshinobu Inoue int lenlim, copied; 147182cd038dSYoshinobu Inoue 147233841545SHajimu UMEMOTO nni6->ni_code = ICMP6_NI_SUCCESS; 147333841545SHajimu UMEMOTO n->m_pkthdr.len = n->m_len = 147433841545SHajimu UMEMOTO sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 147533841545SHajimu UMEMOTO lenlim = M_TRAILINGSPACE(n); 147682cd038dSYoshinobu Inoue copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 147782cd038dSYoshinobu Inoue /* XXX: reset mbuf length */ 147882cd038dSYoshinobu Inoue n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 147982cd038dSYoshinobu Inoue sizeof(struct icmp6_nodeinfo) + copied; 148082cd038dSYoshinobu Inoue break; 148182cd038dSYoshinobu Inoue } 148282cd038dSYoshinobu Inoue default: 148382cd038dSYoshinobu Inoue break; /* XXX impossible! */ 148482cd038dSYoshinobu Inoue } 148582cd038dSYoshinobu Inoue 148682cd038dSYoshinobu Inoue nni6->ni_type = ICMP6_NI_REPLY; 1487686cdd19SJun-ichiro itojun Hagino m_freem(m); 148882cd038dSYoshinobu Inoue return (n); 148982cd038dSYoshinobu Inoue 149082cd038dSYoshinobu Inoue bad: 1491686cdd19SJun-ichiro itojun Hagino m_freem(m); 149282cd038dSYoshinobu Inoue if (n) 149382cd038dSYoshinobu Inoue m_freem(n); 149482cd038dSYoshinobu Inoue return (NULL); 149582cd038dSYoshinobu Inoue } 149682cd038dSYoshinobu Inoue 149782cd038dSYoshinobu Inoue /* 1498686cdd19SJun-ichiro itojun Hagino * make a mbuf with DNS-encoded string. no compression support. 1499686cdd19SJun-ichiro itojun Hagino * 1500686cdd19SJun-ichiro itojun Hagino * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1501686cdd19SJun-ichiro itojun Hagino * treated as truncated name (two \0 at the end). this is a wild guess. 15021272577eSXin LI * 15031272577eSXin LI * old - return pascal string if non-zero 1504686cdd19SJun-ichiro itojun Hagino */ 1505686cdd19SJun-ichiro itojun Hagino static struct mbuf * 15061272577eSXin LI ni6_nametodns(const char *name, int namelen, int old) 1507686cdd19SJun-ichiro itojun Hagino { 1508686cdd19SJun-ichiro itojun Hagino struct mbuf *m; 1509686cdd19SJun-ichiro itojun Hagino char *cp, *ep; 1510686cdd19SJun-ichiro itojun Hagino const char *p, *q; 1511686cdd19SJun-ichiro itojun Hagino int i, len, nterm; 1512686cdd19SJun-ichiro itojun Hagino 1513686cdd19SJun-ichiro itojun Hagino if (old) 1514686cdd19SJun-ichiro itojun Hagino len = namelen + 1; 1515686cdd19SJun-ichiro itojun Hagino else 1516686cdd19SJun-ichiro itojun Hagino len = MCLBYTES; 1517686cdd19SJun-ichiro itojun Hagino 15187b07d1beSGleb Smirnoff /* Because MAXHOSTNAMELEN is usually 256, we use cluster mbuf. */ 15197b07d1beSGleb Smirnoff if (len > MLEN) 15207b07d1beSGleb Smirnoff m = m_getcl(M_NOWAIT, MT_DATA, 0); 15217b07d1beSGleb Smirnoff else 15227b07d1beSGleb Smirnoff m = m_get(M_NOWAIT, MT_DATA); 15237b07d1beSGleb Smirnoff if (m == NULL) 1524686cdd19SJun-ichiro itojun Hagino goto fail; 1525686cdd19SJun-ichiro itojun Hagino 1526686cdd19SJun-ichiro itojun Hagino if (old) { 1527686cdd19SJun-ichiro itojun Hagino m->m_len = len; 1528686cdd19SJun-ichiro itojun Hagino *mtod(m, char *) = namelen; 1529686cdd19SJun-ichiro itojun Hagino bcopy(name, mtod(m, char *) + 1, namelen); 1530686cdd19SJun-ichiro itojun Hagino return m; 1531686cdd19SJun-ichiro itojun Hagino } else { 1532686cdd19SJun-ichiro itojun Hagino m->m_len = 0; 1533686cdd19SJun-ichiro itojun Hagino cp = mtod(m, char *); 1534686cdd19SJun-ichiro itojun Hagino ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1535686cdd19SJun-ichiro itojun Hagino 1536686cdd19SJun-ichiro itojun Hagino /* if not certain about my name, return empty buffer */ 1537686cdd19SJun-ichiro itojun Hagino if (namelen == 0) 1538686cdd19SJun-ichiro itojun Hagino return m; 1539686cdd19SJun-ichiro itojun Hagino 1540686cdd19SJun-ichiro itojun Hagino /* 1541686cdd19SJun-ichiro itojun Hagino * guess if it looks like shortened hostname, or FQDN. 1542686cdd19SJun-ichiro itojun Hagino * shortened hostname needs two trailing "\0". 1543686cdd19SJun-ichiro itojun Hagino */ 1544686cdd19SJun-ichiro itojun Hagino i = 0; 1545686cdd19SJun-ichiro itojun Hagino for (p = name; p < name + namelen; p++) { 1546686cdd19SJun-ichiro itojun Hagino if (*p && *p == '.') 1547686cdd19SJun-ichiro itojun Hagino i++; 1548686cdd19SJun-ichiro itojun Hagino } 1549686cdd19SJun-ichiro itojun Hagino if (i < 2) 1550686cdd19SJun-ichiro itojun Hagino nterm = 2; 1551686cdd19SJun-ichiro itojun Hagino else 1552686cdd19SJun-ichiro itojun Hagino nterm = 1; 1553686cdd19SJun-ichiro itojun Hagino 1554686cdd19SJun-ichiro itojun Hagino p = name; 1555686cdd19SJun-ichiro itojun Hagino while (cp < ep && p < name + namelen) { 1556686cdd19SJun-ichiro itojun Hagino i = 0; 1557686cdd19SJun-ichiro itojun Hagino for (q = p; q < name + namelen && *q && *q != '.'; q++) 1558686cdd19SJun-ichiro itojun Hagino i++; 1559686cdd19SJun-ichiro itojun Hagino /* result does not fit into mbuf */ 1560686cdd19SJun-ichiro itojun Hagino if (cp + i + 1 >= ep) 1561686cdd19SJun-ichiro itojun Hagino goto fail; 1562610be6ceSHajimu UMEMOTO /* 1563610be6ceSHajimu UMEMOTO * DNS label length restriction, RFC1035 page 8. 1564610be6ceSHajimu UMEMOTO * "i == 0" case is included here to avoid returning 1565610be6ceSHajimu UMEMOTO * 0-length label on "foo..bar". 1566610be6ceSHajimu UMEMOTO */ 1567610be6ceSHajimu UMEMOTO if (i <= 0 || i >= 64) 1568686cdd19SJun-ichiro itojun Hagino goto fail; 1569686cdd19SJun-ichiro itojun Hagino *cp++ = i; 1570686cdd19SJun-ichiro itojun Hagino bcopy(p, cp, i); 1571686cdd19SJun-ichiro itojun Hagino cp += i; 1572686cdd19SJun-ichiro itojun Hagino p = q; 1573686cdd19SJun-ichiro itojun Hagino if (p < name + namelen && *p == '.') 1574686cdd19SJun-ichiro itojun Hagino p++; 1575686cdd19SJun-ichiro itojun Hagino } 1576686cdd19SJun-ichiro itojun Hagino /* termination */ 1577686cdd19SJun-ichiro itojun Hagino if (cp + nterm >= ep) 1578686cdd19SJun-ichiro itojun Hagino goto fail; 1579686cdd19SJun-ichiro itojun Hagino while (nterm-- > 0) 1580686cdd19SJun-ichiro itojun Hagino *cp++ = '\0'; 1581686cdd19SJun-ichiro itojun Hagino m->m_len = cp - mtod(m, char *); 1582686cdd19SJun-ichiro itojun Hagino return m; 1583686cdd19SJun-ichiro itojun Hagino } 1584686cdd19SJun-ichiro itojun Hagino 1585686cdd19SJun-ichiro itojun Hagino panic("should not reach here"); 1586686cdd19SJun-ichiro itojun Hagino /* NOTREACHED */ 1587686cdd19SJun-ichiro itojun Hagino 1588686cdd19SJun-ichiro itojun Hagino fail: 1589686cdd19SJun-ichiro itojun Hagino if (m) 1590686cdd19SJun-ichiro itojun Hagino m_freem(m); 1591686cdd19SJun-ichiro itojun Hagino return NULL; 1592686cdd19SJun-ichiro itojun Hagino } 1593686cdd19SJun-ichiro itojun Hagino 1594686cdd19SJun-ichiro itojun Hagino /* 1595686cdd19SJun-ichiro itojun Hagino * check if two DNS-encoded string matches. takes care of truncated 1596686cdd19SJun-ichiro itojun Hagino * form (with \0\0 at the end). no compression support. 159733841545SHajimu UMEMOTO * XXX upper/lowercase match (see RFC2065) 1598686cdd19SJun-ichiro itojun Hagino */ 1599686cdd19SJun-ichiro itojun Hagino static int 16001272577eSXin LI ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1601686cdd19SJun-ichiro itojun Hagino { 1602686cdd19SJun-ichiro itojun Hagino const char *a0, *b0; 1603686cdd19SJun-ichiro itojun Hagino int l; 1604686cdd19SJun-ichiro itojun Hagino 1605686cdd19SJun-ichiro itojun Hagino /* simplest case - need validation? */ 1606686cdd19SJun-ichiro itojun Hagino if (alen == blen && bcmp(a, b, alen) == 0) 1607686cdd19SJun-ichiro itojun Hagino return 1; 1608686cdd19SJun-ichiro itojun Hagino 1609686cdd19SJun-ichiro itojun Hagino a0 = a; 1610686cdd19SJun-ichiro itojun Hagino b0 = b; 1611686cdd19SJun-ichiro itojun Hagino 1612686cdd19SJun-ichiro itojun Hagino /* termination is mandatory */ 1613686cdd19SJun-ichiro itojun Hagino if (alen < 2 || blen < 2) 1614686cdd19SJun-ichiro itojun Hagino return 0; 1615686cdd19SJun-ichiro itojun Hagino if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1616686cdd19SJun-ichiro itojun Hagino return 0; 1617686cdd19SJun-ichiro itojun Hagino alen--; 1618686cdd19SJun-ichiro itojun Hagino blen--; 1619686cdd19SJun-ichiro itojun Hagino 1620686cdd19SJun-ichiro itojun Hagino while (a - a0 < alen && b - b0 < blen) { 1621686cdd19SJun-ichiro itojun Hagino if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1622686cdd19SJun-ichiro itojun Hagino return 0; 1623686cdd19SJun-ichiro itojun Hagino 1624686cdd19SJun-ichiro itojun Hagino if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1625686cdd19SJun-ichiro itojun Hagino return 0; 1626686cdd19SJun-ichiro itojun Hagino /* we don't support compression yet */ 1627686cdd19SJun-ichiro itojun Hagino if (a[0] >= 64 || b[0] >= 64) 1628686cdd19SJun-ichiro itojun Hagino return 0; 1629686cdd19SJun-ichiro itojun Hagino 1630686cdd19SJun-ichiro itojun Hagino /* truncated case */ 1631686cdd19SJun-ichiro itojun Hagino if (a[0] == 0 && a - a0 == alen - 1) 1632686cdd19SJun-ichiro itojun Hagino return 1; 1633686cdd19SJun-ichiro itojun Hagino if (b[0] == 0 && b - b0 == blen - 1) 1634686cdd19SJun-ichiro itojun Hagino return 1; 1635686cdd19SJun-ichiro itojun Hagino if (a[0] == 0 || b[0] == 0) 1636686cdd19SJun-ichiro itojun Hagino return 0; 1637686cdd19SJun-ichiro itojun Hagino 1638686cdd19SJun-ichiro itojun Hagino if (a[0] != b[0]) 1639686cdd19SJun-ichiro itojun Hagino return 0; 1640686cdd19SJun-ichiro itojun Hagino l = a[0]; 1641686cdd19SJun-ichiro itojun Hagino if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1642686cdd19SJun-ichiro itojun Hagino return 0; 1643686cdd19SJun-ichiro itojun Hagino if (bcmp(a + 1, b + 1, l) != 0) 1644686cdd19SJun-ichiro itojun Hagino return 0; 1645686cdd19SJun-ichiro itojun Hagino 1646686cdd19SJun-ichiro itojun Hagino a += 1 + l; 1647686cdd19SJun-ichiro itojun Hagino b += 1 + l; 1648686cdd19SJun-ichiro itojun Hagino } 1649686cdd19SJun-ichiro itojun Hagino 1650686cdd19SJun-ichiro itojun Hagino if (a - a0 == alen && b - b0 == blen) 1651686cdd19SJun-ichiro itojun Hagino return 1; 1652686cdd19SJun-ichiro itojun Hagino else 1653686cdd19SJun-ichiro itojun Hagino return 0; 1654686cdd19SJun-ichiro itojun Hagino } 1655686cdd19SJun-ichiro itojun Hagino 1656686cdd19SJun-ichiro itojun Hagino /* 165782cd038dSYoshinobu Inoue * calculate the number of addresses to be returned in the node info reply. 165882cd038dSYoshinobu Inoue */ 165982cd038dSYoshinobu Inoue static int 16601272577eSXin LI ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp, 16611272577eSXin LI struct in6_addr *subj) 166282cd038dSYoshinobu Inoue { 166333841545SHajimu UMEMOTO struct ifnet *ifp; 166433841545SHajimu UMEMOTO struct in6_ifaddr *ifa6; 166533841545SHajimu UMEMOTO struct ifaddr *ifa; 166682cd038dSYoshinobu Inoue int addrs = 0, addrsofif, iffound = 0; 166733841545SHajimu UMEMOTO int niflags = ni6->ni_flags; 166833841545SHajimu UMEMOTO 1669b8a6e03fSGleb Smirnoff NET_EPOCH_ASSERT(); 1670b8a6e03fSGleb Smirnoff 167133841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 167233841545SHajimu UMEMOTO switch (ni6->ni_code) { 167333841545SHajimu UMEMOTO case ICMP6_NI_SUBJ_IPV6: 167433841545SHajimu UMEMOTO if (subj == NULL) /* must be impossible... */ 167533841545SHajimu UMEMOTO return (0); 167633841545SHajimu UMEMOTO break; 167733841545SHajimu UMEMOTO default: 167833841545SHajimu UMEMOTO /* 167933841545SHajimu UMEMOTO * XXX: we only support IPv6 subject address for 168033841545SHajimu UMEMOTO * this Qtype. 168133841545SHajimu UMEMOTO */ 168233841545SHajimu UMEMOTO return (0); 168333841545SHajimu UMEMOTO } 168433841545SHajimu UMEMOTO } 168582cd038dSYoshinobu Inoue 16864f6c66ccSMatt Macy CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 168782cd038dSYoshinobu Inoue addrsofif = 0; 1688d7c5a620SMatt Macy CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 168982cd038dSYoshinobu Inoue if (ifa->ifa_addr->sa_family != AF_INET6) 169082cd038dSYoshinobu Inoue continue; 169182cd038dSYoshinobu Inoue ifa6 = (struct in6_ifaddr *)ifa; 169282cd038dSYoshinobu Inoue 169333841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1694c66b5feaSHajimu UMEMOTO IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr)) 169582cd038dSYoshinobu Inoue iffound = 1; 169682cd038dSYoshinobu Inoue 1697686cdd19SJun-ichiro itojun Hagino /* 1698686cdd19SJun-ichiro itojun Hagino * IPv4-mapped addresses can only be returned by a 1699686cdd19SJun-ichiro itojun Hagino * Node Information proxy, since they represent 1700686cdd19SJun-ichiro itojun Hagino * addresses of IPv4-only nodes, which perforce do 1701686cdd19SJun-ichiro itojun Hagino * not implement this protocol. 170233841545SHajimu UMEMOTO * [icmp-name-lookups-07, Section 5.4] 1703686cdd19SJun-ichiro itojun Hagino * So we don't support NI_NODEADDR_FLAG_COMPAT in 1704686cdd19SJun-ichiro itojun Hagino * this function at this moment. 1705686cdd19SJun-ichiro itojun Hagino */ 1706686cdd19SJun-ichiro itojun Hagino 170782cd038dSYoshinobu Inoue /* What do we have to do about ::1? */ 170882cd038dSYoshinobu Inoue switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 170982cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_LINKLOCAL: 171033841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 171133841545SHajimu UMEMOTO continue; 171282cd038dSYoshinobu Inoue break; 171382cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_SITELOCAL: 171433841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 171533841545SHajimu UMEMOTO continue; 171682cd038dSYoshinobu Inoue break; 171782cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_GLOBAL: 171833841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 171933841545SHajimu UMEMOTO continue; 172082cd038dSYoshinobu Inoue break; 172182cd038dSYoshinobu Inoue default: 172282cd038dSYoshinobu Inoue continue; 172382cd038dSYoshinobu Inoue } 172433841545SHajimu UMEMOTO 172533841545SHajimu UMEMOTO /* 172633841545SHajimu UMEMOTO * check if anycast is okay. 172733841545SHajimu UMEMOTO * XXX: just experimental. not in the spec. 172833841545SHajimu UMEMOTO */ 172933841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 173033841545SHajimu UMEMOTO (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 173133841545SHajimu UMEMOTO continue; /* we need only unicast addresses */ 173233841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1733603724d3SBjoern A. Zeeb (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) { 173433841545SHajimu UMEMOTO continue; 173533841545SHajimu UMEMOTO } 173633841545SHajimu UMEMOTO addrsofif++; /* count the address */ 173782cd038dSYoshinobu Inoue } 173882cd038dSYoshinobu Inoue if (iffound) { 173982cd038dSYoshinobu Inoue *ifpp = ifp; 174082cd038dSYoshinobu Inoue return (addrsofif); 174182cd038dSYoshinobu Inoue } 174282cd038dSYoshinobu Inoue 174382cd038dSYoshinobu Inoue addrs += addrsofif; 174482cd038dSYoshinobu Inoue } 174582cd038dSYoshinobu Inoue 174682cd038dSYoshinobu Inoue return (addrs); 174782cd038dSYoshinobu Inoue } 174882cd038dSYoshinobu Inoue 174982cd038dSYoshinobu Inoue static int 17501272577eSXin LI ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6, 17511272577eSXin LI struct ifnet *ifp0, int resid) 175282cd038dSYoshinobu Inoue { 175394e83133SJohn Baldwin struct ifnet *ifp; 175433841545SHajimu UMEMOTO struct in6_ifaddr *ifa6; 175533841545SHajimu UMEMOTO struct ifaddr *ifa; 175633841545SHajimu UMEMOTO struct ifnet *ifp_dep = NULL; 175733841545SHajimu UMEMOTO int copied = 0, allow_deprecated = 0; 175882cd038dSYoshinobu Inoue u_char *cp = (u_char *)(nni6 + 1); 175933841545SHajimu UMEMOTO int niflags = ni6->ni_flags; 176033841545SHajimu UMEMOTO u_int32_t ltime; 176182cd038dSYoshinobu Inoue 1762b8a6e03fSGleb Smirnoff NET_EPOCH_ASSERT(); 1763b8a6e03fSGleb Smirnoff 176433841545SHajimu UMEMOTO if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 176582cd038dSYoshinobu Inoue return (0); /* needless to copy */ 176682cd038dSYoshinobu Inoue 17674f6c66ccSMatt Macy ifp = ifp0 ? ifp0 : CK_STAILQ_FIRST(&V_ifnet); 176833841545SHajimu UMEMOTO again: 17690527d333SHajimu UMEMOTO 17704f6c66ccSMatt Macy for (; ifp; ifp = CK_STAILQ_NEXT(ifp, if_link)) { 1771d7c5a620SMatt Macy CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 177282cd038dSYoshinobu Inoue if (ifa->ifa_addr->sa_family != AF_INET6) 177382cd038dSYoshinobu Inoue continue; 177482cd038dSYoshinobu Inoue ifa6 = (struct in6_ifaddr *)ifa; 177582cd038dSYoshinobu Inoue 177633841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 177733841545SHajimu UMEMOTO allow_deprecated == 0) { 177833841545SHajimu UMEMOTO /* 177933841545SHajimu UMEMOTO * prefererred address should be put before 178033841545SHajimu UMEMOTO * deprecated addresses. 178133841545SHajimu UMEMOTO */ 178233841545SHajimu UMEMOTO 178333841545SHajimu UMEMOTO /* record the interface for later search */ 178433841545SHajimu UMEMOTO if (ifp_dep == NULL) 178533841545SHajimu UMEMOTO ifp_dep = ifp; 178633841545SHajimu UMEMOTO 178782cd038dSYoshinobu Inoue continue; 178806cd0a3fSHajimu UMEMOTO } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 178933841545SHajimu UMEMOTO allow_deprecated != 0) 179033841545SHajimu UMEMOTO continue; /* we now collect deprecated addrs */ 179182cd038dSYoshinobu Inoue 179282cd038dSYoshinobu Inoue /* What do we have to do about ::1? */ 179382cd038dSYoshinobu Inoue switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 179482cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_LINKLOCAL: 179533841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 179633841545SHajimu UMEMOTO continue; 179782cd038dSYoshinobu Inoue break; 179882cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_SITELOCAL: 179933841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 180033841545SHajimu UMEMOTO continue; 180182cd038dSYoshinobu Inoue break; 180282cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_GLOBAL: 180333841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 180433841545SHajimu UMEMOTO continue; 180582cd038dSYoshinobu Inoue break; 180682cd038dSYoshinobu Inoue default: 180782cd038dSYoshinobu Inoue continue; 180882cd038dSYoshinobu Inoue } 180982cd038dSYoshinobu Inoue 181033841545SHajimu UMEMOTO /* 181133841545SHajimu UMEMOTO * check if anycast is okay. 181233841545SHajimu UMEMOTO * XXX: just experimental. not in the spec. 181333841545SHajimu UMEMOTO */ 181433841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 181533841545SHajimu UMEMOTO (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 181633841545SHajimu UMEMOTO continue; 181733841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1818603724d3SBjoern A. Zeeb (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) { 181933841545SHajimu UMEMOTO continue; 182033841545SHajimu UMEMOTO } 182133841545SHajimu UMEMOTO 182233841545SHajimu UMEMOTO /* now we can copy the address */ 182333841545SHajimu UMEMOTO if (resid < sizeof(struct in6_addr) + 182433841545SHajimu UMEMOTO sizeof(u_int32_t)) { 182582cd038dSYoshinobu Inoue /* 182682cd038dSYoshinobu Inoue * We give up much more copy. 182782cd038dSYoshinobu Inoue * Set the truncate flag and return. 182882cd038dSYoshinobu Inoue */ 182906cd0a3fSHajimu UMEMOTO nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 183082cd038dSYoshinobu Inoue return (copied); 183182cd038dSYoshinobu Inoue } 183233841545SHajimu UMEMOTO 183333841545SHajimu UMEMOTO /* 183433841545SHajimu UMEMOTO * Set the TTL of the address. 183533841545SHajimu UMEMOTO * The TTL value should be one of the following 183633841545SHajimu UMEMOTO * according to the specification: 183733841545SHajimu UMEMOTO * 183833841545SHajimu UMEMOTO * 1. The remaining lifetime of a DHCP lease on the 183933841545SHajimu UMEMOTO * address, or 184033841545SHajimu UMEMOTO * 2. The remaining Valid Lifetime of a prefix from 184133841545SHajimu UMEMOTO * which the address was derived through Stateless 184233841545SHajimu UMEMOTO * Autoconfiguration. 184333841545SHajimu UMEMOTO * 184433841545SHajimu UMEMOTO * Note that we currently do not support stateful 184533841545SHajimu UMEMOTO * address configuration by DHCPv6, so the former 184633841545SHajimu UMEMOTO * case can't happen. 184733841545SHajimu UMEMOTO */ 184833841545SHajimu UMEMOTO if (ifa6->ia6_lifetime.ia6t_expire == 0) 184933841545SHajimu UMEMOTO ltime = ND6_INFINITE_LIFETIME; 185033841545SHajimu UMEMOTO else { 185133841545SHajimu UMEMOTO if (ifa6->ia6_lifetime.ia6t_expire > 18527d26db17SHiroki Sato time_uptime) 18537d26db17SHiroki Sato ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime); 185433841545SHajimu UMEMOTO else 185533841545SHajimu UMEMOTO ltime = 0; 185633841545SHajimu UMEMOTO } 185733841545SHajimu UMEMOTO 185833841545SHajimu UMEMOTO bcopy(<ime, cp, sizeof(u_int32_t)); 185933841545SHajimu UMEMOTO cp += sizeof(u_int32_t); 186033841545SHajimu UMEMOTO 186133841545SHajimu UMEMOTO /* copy the address itself */ 186282cd038dSYoshinobu Inoue bcopy(&ifa6->ia_addr.sin6_addr, cp, 186382cd038dSYoshinobu Inoue sizeof(struct in6_addr)); 18649a4f9608SHajimu UMEMOTO in6_clearscope((struct in6_addr *)cp); /* XXX */ 186582cd038dSYoshinobu Inoue cp += sizeof(struct in6_addr); 186633841545SHajimu UMEMOTO 186733841545SHajimu UMEMOTO resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 186806cd0a3fSHajimu UMEMOTO copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 186982cd038dSYoshinobu Inoue } 187082cd038dSYoshinobu Inoue if (ifp0) /* we need search only on the specified IF */ 187182cd038dSYoshinobu Inoue break; 187282cd038dSYoshinobu Inoue } 187382cd038dSYoshinobu Inoue 187433841545SHajimu UMEMOTO if (allow_deprecated == 0 && ifp_dep != NULL) { 187533841545SHajimu UMEMOTO ifp = ifp_dep; 187633841545SHajimu UMEMOTO allow_deprecated = 1; 187733841545SHajimu UMEMOTO 187833841545SHajimu UMEMOTO goto again; 187933841545SHajimu UMEMOTO } 188033841545SHajimu UMEMOTO 188182cd038dSYoshinobu Inoue return (copied); 188282cd038dSYoshinobu Inoue } 188382cd038dSYoshinobu Inoue 188482cd038dSYoshinobu Inoue /* 188582cd038dSYoshinobu Inoue * XXX almost dup'ed code with rip6_input. 188682cd038dSYoshinobu Inoue */ 188782cd038dSYoshinobu Inoue static int 18881272577eSXin LI icmp6_rip6_input(struct mbuf **mp, int off) 188982cd038dSYoshinobu Inoue { 189082cd038dSYoshinobu Inoue struct mbuf *m = *mp; 189133841545SHajimu UMEMOTO struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 18920ecd976eSBjoern A. Zeeb struct inpcb *inp; 1893fc384fa5SBjoern A. Zeeb struct inpcb *last = NULL; 18949a4f9608SHajimu UMEMOTO struct sockaddr_in6 fromsa; 189582cd038dSYoshinobu Inoue struct icmp6_hdr *icmp6; 189682cd038dSYoshinobu Inoue struct mbuf *opts = NULL; 189782cd038dSYoshinobu Inoue 1898*cf377af6SGleb Smirnoff NET_EPOCH_ASSERT(); 1899*cf377af6SGleb Smirnoff 1900686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 190182cd038dSYoshinobu Inoue /* this is assumed to be safe. */ 190282cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 1903686cdd19SJun-ichiro itojun Hagino #else 1904686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1905686cdd19SJun-ichiro itojun Hagino if (icmp6 == NULL) { 1906686cdd19SJun-ichiro itojun Hagino /* m is already reclaimed */ 190706cd0a3fSHajimu UMEMOTO return (IPPROTO_DONE); 1908686cdd19SJun-ichiro itojun Hagino } 1909686cdd19SJun-ichiro itojun Hagino #endif 191082cd038dSYoshinobu Inoue 1911a1f7e5f8SHajimu UMEMOTO /* 1912a1f7e5f8SHajimu UMEMOTO * XXX: the address may have embedded scope zone ID, which should be 1913a1f7e5f8SHajimu UMEMOTO * hidden from applications. 1914a1f7e5f8SHajimu UMEMOTO */ 19159a4f9608SHajimu UMEMOTO bzero(&fromsa, sizeof(fromsa)); 19169a4f9608SHajimu UMEMOTO fromsa.sin6_family = AF_INET6; 1917a1f7e5f8SHajimu UMEMOTO fromsa.sin6_len = sizeof(struct sockaddr_in6); 1918a1f7e5f8SHajimu UMEMOTO fromsa.sin6_addr = ip6->ip6_src; 1919a1f7e5f8SHajimu UMEMOTO if (sa6_recoverscope(&fromsa)) { 1920a1f7e5f8SHajimu UMEMOTO m_freem(m); 1921a1f7e5f8SHajimu UMEMOTO return (IPPROTO_DONE); 1922a1f7e5f8SHajimu UMEMOTO } 192382cd038dSYoshinobu Inoue 19240ecd976eSBjoern A. Zeeb CK_LIST_FOREACH(inp, &V_ripcb, inp_list) { 19250ecd976eSBjoern A. Zeeb if ((inp->inp_vflag & INP_IPV6) == 0) 192682cd038dSYoshinobu Inoue continue; 19270ecd976eSBjoern A. Zeeb if (inp->inp_ip_p != IPPROTO_ICMPV6) 1928b11e21aeSAlexander Motin continue; 19290ecd976eSBjoern A. Zeeb if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 19300ecd976eSBjoern A. Zeeb !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &ip6->ip6_dst)) 1931b11e21aeSAlexander Motin continue; 19320ecd976eSBjoern A. Zeeb if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 19330ecd976eSBjoern A. Zeeb !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &ip6->ip6_src)) 1934b11e21aeSAlexander Motin continue; 19350ecd976eSBjoern A. Zeeb INP_RLOCK(inp); 19360ecd976eSBjoern A. Zeeb if (__predict_false(inp->inp_flags2 & INP_FREED)) { 19370ecd976eSBjoern A. Zeeb INP_RUNLOCK(inp); 19386675bee8SBjoern A. Zeeb continue; 19396675bee8SBjoern A. Zeeb } 19402f1ff0cdSRobert Watson if (ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 19410ecd976eSBjoern A. Zeeb inp->in6p_icmp6filt)) { 19420ecd976eSBjoern A. Zeeb INP_RUNLOCK(inp); 1943b11e21aeSAlexander Motin continue; 19446c5bbf5cSAlexander Motin } 1945aba53ef0SKip Macy if (last != NULL) { 1946657db3c8SHajimu UMEMOTO struct mbuf *n = NULL; 1947657db3c8SHajimu UMEMOTO 1948657db3c8SHajimu UMEMOTO /* 1949657db3c8SHajimu UMEMOTO * Recent network drivers tend to allocate a single 1950657db3c8SHajimu UMEMOTO * mbuf cluster, rather than to make a couple of 1951657db3c8SHajimu UMEMOTO * mbufs without clusters. Also, since the IPv6 code 1952657db3c8SHajimu UMEMOTO * path tries to avoid m_pullup(), it is highly 1953657db3c8SHajimu UMEMOTO * probable that we still have an mbuf cluster here 1954657db3c8SHajimu UMEMOTO * even though the necessary length can be stored in an 1955657db3c8SHajimu UMEMOTO * mbuf's internal buffer. 1956657db3c8SHajimu UMEMOTO * Meanwhile, the default size of the receive socket 1957657db3c8SHajimu UMEMOTO * buffer for raw sockets is not so large. This means 1958657db3c8SHajimu UMEMOTO * the possibility of packet loss is relatively higher 1959657db3c8SHajimu UMEMOTO * than before. To avoid this scenario, we copy the 1960657db3c8SHajimu UMEMOTO * received data to a separate mbuf that does not use 1961657db3c8SHajimu UMEMOTO * a cluster, if possible. 1962657db3c8SHajimu UMEMOTO * XXX: it is better to copy the data after stripping 1963657db3c8SHajimu UMEMOTO * intermediate headers. 1964657db3c8SHajimu UMEMOTO */ 1965657db3c8SHajimu UMEMOTO if ((m->m_flags & M_EXT) && m->m_next == NULL && 1966657db3c8SHajimu UMEMOTO m->m_len <= MHLEN) { 19677b07d1beSGleb Smirnoff n = m_get(M_NOWAIT, m->m_type); 1968657db3c8SHajimu UMEMOTO if (n != NULL) { 1969c543ec4eSGeorge V. Neville-Neil if (m_dup_pkthdr(n, m, M_NOWAIT)) { 1970c543ec4eSGeorge V. Neville-Neil bcopy(m->m_data, n->m_data, 1971c543ec4eSGeorge V. Neville-Neil m->m_len); 1972657db3c8SHajimu UMEMOTO n->m_len = m->m_len; 1973c543ec4eSGeorge V. Neville-Neil } else { 1974c543ec4eSGeorge V. Neville-Neil m_free(n); 1975c543ec4eSGeorge V. Neville-Neil n = NULL; 1976c543ec4eSGeorge V. Neville-Neil } 1977657db3c8SHajimu UMEMOTO } 1978657db3c8SHajimu UMEMOTO } 1979657db3c8SHajimu UMEMOTO if (n != NULL || 1980c3bef61eSKevin Lo (n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) != NULL) { 198197590249SBjoern A. Zeeb if (last->inp_flags & INP_CONTROLOPTS) 198211de19f4SHajimu UMEMOTO ip6_savecontrol(last, n, &opts); 198382cd038dSYoshinobu Inoue /* strip intermediate headers */ 198482cd038dSYoshinobu Inoue m_adj(n, off); 1985fc384fa5SBjoern A. Zeeb SOCKBUF_LOCK(&last->inp_socket->so_rcv); 1986c9db0fadSRobert Watson if (sbappendaddr_locked( 1987fc384fa5SBjoern A. Zeeb &last->inp_socket->so_rcv, 19889a4f9608SHajimu UMEMOTO (struct sockaddr *)&fromsa, n, opts) 198906cd0a3fSHajimu UMEMOTO == 0) { 199082cd038dSYoshinobu Inoue /* should notify about lost packet */ 199182cd038dSYoshinobu Inoue m_freem(n); 199233841545SHajimu UMEMOTO if (opts) { 199382cd038dSYoshinobu Inoue m_freem(opts); 199433841545SHajimu UMEMOTO } 1995c9db0fadSRobert Watson SOCKBUF_UNLOCK( 1996fc384fa5SBjoern A. Zeeb &last->inp_socket->so_rcv); 19974cc20ab1SSeigo Tanimura } else 1998fc384fa5SBjoern A. Zeeb sorwakeup_locked(last->inp_socket); 199982cd038dSYoshinobu Inoue opts = NULL; 200082cd038dSYoshinobu Inoue } 2001bb145f60SRobert Watson INP_RUNLOCK(last); 200282cd038dSYoshinobu Inoue } 20030ecd976eSBjoern A. Zeeb last = inp; 200482cd038dSYoshinobu Inoue } 2005aba53ef0SKip Macy if (last != NULL) { 200697590249SBjoern A. Zeeb if (last->inp_flags & INP_CONTROLOPTS) 200711de19f4SHajimu UMEMOTO ip6_savecontrol(last, m, &opts); 200882cd038dSYoshinobu Inoue /* strip intermediate headers */ 200982cd038dSYoshinobu Inoue m_adj(m, off); 2010657db3c8SHajimu UMEMOTO 2011657db3c8SHajimu UMEMOTO /* avoid using mbuf clusters if possible (see above) */ 2012657db3c8SHajimu UMEMOTO if ((m->m_flags & M_EXT) && m->m_next == NULL && 2013657db3c8SHajimu UMEMOTO m->m_len <= MHLEN) { 2014657db3c8SHajimu UMEMOTO struct mbuf *n; 2015657db3c8SHajimu UMEMOTO 20167b07d1beSGleb Smirnoff n = m_get(M_NOWAIT, m->m_type); 2017657db3c8SHajimu UMEMOTO if (n != NULL) { 2018c543ec4eSGeorge V. Neville-Neil if (m_dup_pkthdr(n, m, M_NOWAIT)) { 2019657db3c8SHajimu UMEMOTO bcopy(m->m_data, n->m_data, m->m_len); 2020657db3c8SHajimu UMEMOTO n->m_len = m->m_len; 2021657db3c8SHajimu UMEMOTO 2022657db3c8SHajimu UMEMOTO m_freem(m); 2023657db3c8SHajimu UMEMOTO m = n; 2024c543ec4eSGeorge V. Neville-Neil } else { 2025c543ec4eSGeorge V. Neville-Neil m_freem(n); 2026c543ec4eSGeorge V. Neville-Neil n = NULL; 2027c543ec4eSGeorge V. Neville-Neil } 2028657db3c8SHajimu UMEMOTO } 2029657db3c8SHajimu UMEMOTO } 2030fc384fa5SBjoern A. Zeeb SOCKBUF_LOCK(&last->inp_socket->so_rcv); 2031fc384fa5SBjoern A. Zeeb if (sbappendaddr_locked(&last->inp_socket->so_rcv, 20329a4f9608SHajimu UMEMOTO (struct sockaddr *)&fromsa, m, opts) == 0) { 203382cd038dSYoshinobu Inoue m_freem(m); 203482cd038dSYoshinobu Inoue if (opts) 203582cd038dSYoshinobu Inoue m_freem(opts); 2036fc384fa5SBjoern A. Zeeb SOCKBUF_UNLOCK(&last->inp_socket->so_rcv); 20374cc20ab1SSeigo Tanimura } else 2038fc384fa5SBjoern A. Zeeb sorwakeup_locked(last->inp_socket); 2039bb145f60SRobert Watson INP_RUNLOCK(last); 204082cd038dSYoshinobu Inoue } else { 204182cd038dSYoshinobu Inoue m_freem(m); 204233cde130SBruce M Simpson IP6STAT_DEC(ip6s_delivered); 204382cd038dSYoshinobu Inoue } 204482cd038dSYoshinobu Inoue return IPPROTO_DONE; 204582cd038dSYoshinobu Inoue } 204682cd038dSYoshinobu Inoue 204782cd038dSYoshinobu Inoue /* 204882cd038dSYoshinobu Inoue * Reflect the ip6 packet back to the source. 2049686cdd19SJun-ichiro itojun Hagino * OFF points to the icmp6 header, counted from the top of the mbuf. 205082cd038dSYoshinobu Inoue */ 205182cd038dSYoshinobu Inoue void 20521272577eSXin LI icmp6_reflect(struct mbuf *m, size_t off) 205382cd038dSYoshinobu Inoue { 2054ab861e6cSAlexander V. Chernikov struct in6_addr src6, *srcp; 2055686cdd19SJun-ichiro itojun Hagino struct ip6_hdr *ip6; 205682cd038dSYoshinobu Inoue struct icmp6_hdr *icmp6; 20578c0fec80SRobert Watson struct in6_ifaddr *ia = NULL; 20583e88eb90SAndrey V. Elsukov struct ifnet *outif = NULL; 2059686cdd19SJun-ichiro itojun Hagino int plen; 2060ab861e6cSAlexander V. Chernikov int type, code, hlim; 206182cd038dSYoshinobu Inoue 2062686cdd19SJun-ichiro itojun Hagino /* too short to reflect */ 2063686cdd19SJun-ichiro itojun Hagino if (off < sizeof(struct ip6_hdr)) { 206433841545SHajimu UMEMOTO nd6log((LOG_DEBUG, 206533841545SHajimu UMEMOTO "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2066686cdd19SJun-ichiro itojun Hagino (u_long)off, (u_long)sizeof(struct ip6_hdr), 206733841545SHajimu UMEMOTO __FILE__, __LINE__)); 2068686cdd19SJun-ichiro itojun Hagino goto bad; 2069686cdd19SJun-ichiro itojun Hagino } 2070686cdd19SJun-ichiro itojun Hagino 207182cd038dSYoshinobu Inoue /* 207282cd038dSYoshinobu Inoue * If there are extra headers between IPv6 and ICMPv6, strip 207382cd038dSYoshinobu Inoue * off that header first. 207482cd038dSYoshinobu Inoue */ 2075686cdd19SJun-ichiro itojun Hagino #ifdef DIAGNOSTIC 2076686cdd19SJun-ichiro itojun Hagino if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2077686cdd19SJun-ichiro itojun Hagino panic("assumption failed in icmp6_reflect"); 2078686cdd19SJun-ichiro itojun Hagino #endif 2079686cdd19SJun-ichiro itojun Hagino if (off > sizeof(struct ip6_hdr)) { 2080686cdd19SJun-ichiro itojun Hagino size_t l; 2081686cdd19SJun-ichiro itojun Hagino struct ip6_hdr nip6; 208282cd038dSYoshinobu Inoue 2083686cdd19SJun-ichiro itojun Hagino l = off - sizeof(struct ip6_hdr); 2084686cdd19SJun-ichiro itojun Hagino m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 2085686cdd19SJun-ichiro itojun Hagino m_adj(m, l); 2086686cdd19SJun-ichiro itojun Hagino l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2087686cdd19SJun-ichiro itojun Hagino if (m->m_len < l) { 2088686cdd19SJun-ichiro itojun Hagino if ((m = m_pullup(m, l)) == NULL) 2089686cdd19SJun-ichiro itojun Hagino return; 209082cd038dSYoshinobu Inoue } 2091686cdd19SJun-ichiro itojun Hagino bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 2092686cdd19SJun-ichiro itojun Hagino } else /* off == sizeof(struct ip6_hdr) */ { 2093686cdd19SJun-ichiro itojun Hagino size_t l; 2094686cdd19SJun-ichiro itojun Hagino l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2095686cdd19SJun-ichiro itojun Hagino if (m->m_len < l) { 2096686cdd19SJun-ichiro itojun Hagino if ((m = m_pullup(m, l)) == NULL) 2097686cdd19SJun-ichiro itojun Hagino return; 209882cd038dSYoshinobu Inoue } 2099686cdd19SJun-ichiro itojun Hagino } 2100686cdd19SJun-ichiro itojun Hagino plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 210182cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 210282cd038dSYoshinobu Inoue ip6->ip6_nxt = IPPROTO_ICMPV6; 210382cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)(ip6 + 1); 210482cd038dSYoshinobu Inoue type = icmp6->icmp6_type; /* keep type for statistics */ 210582cd038dSYoshinobu Inoue code = icmp6->icmp6_code; /* ditto. */ 2106ab861e6cSAlexander V. Chernikov hlim = 0; 2107ab861e6cSAlexander V. Chernikov srcp = NULL; 210882cd038dSYoshinobu Inoue 210982cd038dSYoshinobu Inoue /* 211082cd038dSYoshinobu Inoue * If the incoming packet was addressed directly to us (i.e. unicast), 211182cd038dSYoshinobu Inoue * use dst as the src for the reply. 211206cd0a3fSHajimu UMEMOTO * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2113686cdd19SJun-ichiro itojun Hagino * (for example) when we encounter an error while forwarding procedure 2114686cdd19SJun-ichiro itojun Hagino * destined to a duplicated address of ours. 211582cd038dSYoshinobu Inoue */ 21163e88eb90SAndrey V. Elsukov if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 21173e88eb90SAndrey V. Elsukov ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */); 21183e88eb90SAndrey V. Elsukov if (ia != NULL && !(ia->ia6_flags & 2119ab861e6cSAlexander V. Chernikov (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) { 2120ab861e6cSAlexander V. Chernikov src6 = ia->ia_addr.sin6_addr; 2121ab861e6cSAlexander V. Chernikov srcp = &src6; 2122ab861e6cSAlexander V. Chernikov 2123ab861e6cSAlexander V. Chernikov if (m->m_pkthdr.rcvif != NULL) { 2124ab861e6cSAlexander V. Chernikov /* XXX: This may not be the outgoing interface */ 2125ab861e6cSAlexander V. Chernikov hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim; 2126ab861e6cSAlexander V. Chernikov } else 2127ab861e6cSAlexander V. Chernikov hlim = V_ip6_defhlim; 2128ab861e6cSAlexander V. Chernikov } 2129ab861e6cSAlexander V. Chernikov if (ia != NULL) 2130ab861e6cSAlexander V. Chernikov ifa_free(&ia->ia_ifa); 213182cd038dSYoshinobu Inoue } 213282cd038dSYoshinobu Inoue 213388d166bfSBjoern A. Zeeb if (srcp == NULL) { 2134601c0b8bSAlexander V. Chernikov int error; 2135601c0b8bSAlexander V. Chernikov struct in6_addr dst6; 2136601c0b8bSAlexander V. Chernikov uint32_t scopeid; 213733841545SHajimu UMEMOTO 213882cd038dSYoshinobu Inoue /* 2139686cdd19SJun-ichiro itojun Hagino * This case matches to multicasts, our anycast, or unicasts 214033841545SHajimu UMEMOTO * that we do not own. Select a source address based on the 214133841545SHajimu UMEMOTO * source address of the erroneous packet. 214282cd038dSYoshinobu Inoue */ 21435a03e781SAndrey V. Elsukov in6_splitscope(&ip6->ip6_src, &dst6, &scopeid); 2144559b4296SAlan Somers error = in6_selectsrc_addr(M_GETFIB(m), &dst6, 2145601c0b8bSAlexander V. Chernikov scopeid, NULL, &src6, &hlim); 2146a1f7e5f8SHajimu UMEMOTO 2147601c0b8bSAlexander V. Chernikov if (error) { 21481d54aa3bSBjoern A. Zeeb char ip6buf[INET6_ADDRSTRLEN]; 214933841545SHajimu UMEMOTO nd6log((LOG_DEBUG, 215033841545SHajimu UMEMOTO "icmp6_reflect: source can't be determined: " 215133841545SHajimu UMEMOTO "dst=%s, error=%d\n", 2152601c0b8bSAlexander V. Chernikov ip6_sprintf(ip6buf, &ip6->ip6_dst), error)); 215382cd038dSYoshinobu Inoue goto bad; 215433841545SHajimu UMEMOTO } 2155ab861e6cSAlexander V. Chernikov srcp = &src6; 215633841545SHajimu UMEMOTO } 21573e88eb90SAndrey V. Elsukov /* 21583e88eb90SAndrey V. Elsukov * ip6_input() drops a packet if its src is multicast. 21593e88eb90SAndrey V. Elsukov * So, the src is never multicast. 21603e88eb90SAndrey V. Elsukov */ 21613e88eb90SAndrey V. Elsukov ip6->ip6_dst = ip6->ip6_src; 216288d166bfSBjoern A. Zeeb ip6->ip6_src = *srcp; 216382cd038dSYoshinobu Inoue ip6->ip6_flow = 0; 2164686cdd19SJun-ichiro itojun Hagino ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2165686cdd19SJun-ichiro itojun Hagino ip6->ip6_vfc |= IPV6_VERSION; 216682cd038dSYoshinobu Inoue ip6->ip6_nxt = IPPROTO_ICMPV6; 2167ab861e6cSAlexander V. Chernikov ip6->ip6_hlim = hlim; 216882cd038dSYoshinobu Inoue 216982cd038dSYoshinobu Inoue icmp6->icmp6_cksum = 0; 217082cd038dSYoshinobu Inoue icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 217182cd038dSYoshinobu Inoue sizeof(struct ip6_hdr), plen); 217282cd038dSYoshinobu Inoue 217382cd038dSYoshinobu Inoue /* 217433841545SHajimu UMEMOTO * XXX option handling 217582cd038dSYoshinobu Inoue */ 217682cd038dSYoshinobu Inoue 217782cd038dSYoshinobu Inoue m->m_flags &= ~(M_BCAST|M_MCAST); 2178849eeaa5SAndrey V. Elsukov m->m_pkthdr.rcvif = NULL; 21795d846453SSam Leffler ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 218082cd038dSYoshinobu Inoue if (outif) 218182cd038dSYoshinobu Inoue icmp6_ifoutstat_inc(outif, type, code); 218282cd038dSYoshinobu Inoue 218382cd038dSYoshinobu Inoue return; 218482cd038dSYoshinobu Inoue 218582cd038dSYoshinobu Inoue bad: 218682cd038dSYoshinobu Inoue m_freem(m); 218782cd038dSYoshinobu Inoue return; 218882cd038dSYoshinobu Inoue } 218982cd038dSYoshinobu Inoue 219082cd038dSYoshinobu Inoue void 21911272577eSXin LI icmp6_fasttimo(void) 219282cd038dSYoshinobu Inoue { 2193686cdd19SJun-ichiro itojun Hagino 219433cde130SBruce M Simpson mld_fasttimo(); 219533cde130SBruce M Simpson } 219633cde130SBruce M Simpson 219733cde130SBruce M Simpson void 219833cde130SBruce M Simpson icmp6_slowtimo(void) 219933cde130SBruce M Simpson { 220033cde130SBruce M Simpson 220133cde130SBruce M Simpson mld_slowtimo(); 220282cd038dSYoshinobu Inoue } 220382cd038dSYoshinobu Inoue 220482cd038dSYoshinobu Inoue static const char * 22051272577eSXin LI icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6, 22061272577eSXin LI struct in6_addr *tgt6) 220782cd038dSYoshinobu Inoue { 220882cd038dSYoshinobu Inoue static char buf[1024]; 22091d54aa3bSBjoern A. Zeeb char ip6bufs[INET6_ADDRSTRLEN]; 22101d54aa3bSBjoern A. Zeeb char ip6bufd[INET6_ADDRSTRLEN]; 22111d54aa3bSBjoern A. Zeeb char ip6buft[INET6_ADDRSTRLEN]; 221282cd038dSYoshinobu Inoue snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 22131d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6), 22141d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6buft, tgt6)); 221582cd038dSYoshinobu Inoue return buf; 221682cd038dSYoshinobu Inoue } 221782cd038dSYoshinobu Inoue 221882cd038dSYoshinobu Inoue void 22191272577eSXin LI icmp6_redirect_input(struct mbuf *m, int off) 222082cd038dSYoshinobu Inoue { 22212cb64cb2SGeorge V. Neville-Neil struct ifnet *ifp; 2222503f4e47SBjoern A. Zeeb struct ip6_hdr *ip6; 2223686cdd19SJun-ichiro itojun Hagino struct nd_redirect *nd_rd; 2224503f4e47SBjoern A. Zeeb struct in6_addr src6; 2225686cdd19SJun-ichiro itojun Hagino struct in6_addr redtgt6; 2226686cdd19SJun-ichiro itojun Hagino struct in6_addr reddst6; 222782cd038dSYoshinobu Inoue union nd_opts ndopts; 22281d54aa3bSBjoern A. Zeeb char ip6buf[INET6_ADDRSTRLEN]; 2229503f4e47SBjoern A. Zeeb char *lladdr; 2230503f4e47SBjoern A. Zeeb int icmp6len, is_onlink, is_router, lladdrlen; 223182cd038dSYoshinobu Inoue 223237c1ff48SGleb Smirnoff M_ASSERTPKTHDR(m); 223337c1ff48SGleb Smirnoff KASSERT(m->m_pkthdr.rcvif != NULL, ("%s: no rcvif", __func__)); 22342cb64cb2SGeorge V. Neville-Neil 223582cd038dSYoshinobu Inoue /* XXX if we are router, we don't update route by icmp6 redirect */ 2236603724d3SBjoern A. Zeeb if (V_ip6_forwarding) 2237686cdd19SJun-ichiro itojun Hagino goto freeit; 2238603724d3SBjoern A. Zeeb if (!V_icmp6_rediraccept) 2239686cdd19SJun-ichiro itojun Hagino goto freeit; 2240686cdd19SJun-ichiro itojun Hagino 2241a4061289SAndrey V. Elsukov /* RFC 6980: Nodes MUST silently ignore fragments */ 2242a4061289SAndrey V. Elsukov if(m->m_flags & M_FRAGMENTED) 2243a4061289SAndrey V. Elsukov goto freeit; 2244a4061289SAndrey V. Elsukov 2245503f4e47SBjoern A. Zeeb ip6 = mtod(m, struct ip6_hdr *); 2246503f4e47SBjoern A. Zeeb icmp6len = ntohs(ip6->ip6_plen); 2247686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 2248686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_CHECK(m, off, icmp6len,); 2249686cdd19SJun-ichiro itojun Hagino nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 2250686cdd19SJun-ichiro itojun Hagino #else 2251686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2252686cdd19SJun-ichiro itojun Hagino if (nd_rd == NULL) { 2253e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 225482cd038dSYoshinobu Inoue return; 2255686cdd19SJun-ichiro itojun Hagino } 2256686cdd19SJun-ichiro itojun Hagino #endif 2257503f4e47SBjoern A. Zeeb 2258503f4e47SBjoern A. Zeeb ifp = m->m_pkthdr.rcvif; 2259686cdd19SJun-ichiro itojun Hagino redtgt6 = nd_rd->nd_rd_target; 2260686cdd19SJun-ichiro itojun Hagino reddst6 = nd_rd->nd_rd_dst; 226182cd038dSYoshinobu Inoue 2262503f4e47SBjoern A. Zeeb if (in6_setscope(&redtgt6, ifp, NULL) || 2263503f4e47SBjoern A. Zeeb in6_setscope(&reddst6, ifp, NULL)) { 2264a1f7e5f8SHajimu UMEMOTO goto freeit; 2265a1f7e5f8SHajimu UMEMOTO } 226682cd038dSYoshinobu Inoue 226782cd038dSYoshinobu Inoue /* validation */ 2268503f4e47SBjoern A. Zeeb src6 = ip6->ip6_src; 226982cd038dSYoshinobu Inoue if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 227033841545SHajimu UMEMOTO nd6log((LOG_ERR, 227182cd038dSYoshinobu Inoue "ICMP6 redirect sent from %s rejected; " 227206cd0a3fSHajimu UMEMOTO "must be from linklocal\n", 22731d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6buf, &src6))); 227433841545SHajimu UMEMOTO goto bad; 227582cd038dSYoshinobu Inoue } 227682cd038dSYoshinobu Inoue if (ip6->ip6_hlim != 255) { 227733841545SHajimu UMEMOTO nd6log((LOG_ERR, 227882cd038dSYoshinobu Inoue "ICMP6 redirect sent from %s rejected; " 227982cd038dSYoshinobu Inoue "hlim=%d (must be 255)\n", 22801d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim)); 228133841545SHajimu UMEMOTO goto bad; 228282cd038dSYoshinobu Inoue } 228382cd038dSYoshinobu Inoue { 228482cd038dSYoshinobu Inoue /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 22859977be4aSAlexander V. Chernikov struct nhop6_basic nh6; 22869977be4aSAlexander V. Chernikov struct in6_addr kdst; 22879977be4aSAlexander V. Chernikov uint32_t scopeid; 228882cd038dSYoshinobu Inoue 22899977be4aSAlexander V. Chernikov in6_splitscope(&reddst6, &kdst, &scopeid); 2290559b4296SAlan Somers if (fib6_lookup_nh_basic(ifp->if_fib, &kdst, scopeid, 0, 0,&nh6)==0){ 22919977be4aSAlexander V. Chernikov if ((nh6.nh_flags & NHF_GATEWAY) == 0) { 229233841545SHajimu UMEMOTO nd6log((LOG_ERR, 2293deebc913SHajimu UMEMOTO "ICMP6 redirect rejected; no route " 2294deebc913SHajimu UMEMOTO "with inet6 gateway found for redirect dst: %s\n", 229533841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 229633841545SHajimu UMEMOTO goto bad; 2297deebc913SHajimu UMEMOTO } 2298deebc913SHajimu UMEMOTO 229943105e58SEric van Gyzen /* 230043105e58SEric van Gyzen * Embed scope zone id into next hop address, since 230143105e58SEric van Gyzen * fib6_lookup_nh_basic() returns address without embedded 230243105e58SEric van Gyzen * scope zone id. 230343105e58SEric van Gyzen */ 230443105e58SEric van Gyzen if (in6_setscope(&nh6.nh_addr, m->m_pkthdr.rcvif, NULL)) 230543105e58SEric van Gyzen goto freeit; 230643105e58SEric van Gyzen 23079977be4aSAlexander V. Chernikov if (IN6_ARE_ADDR_EQUAL(&src6, &nh6.nh_addr) == 0) { 230833841545SHajimu UMEMOTO nd6log((LOG_ERR, 230982cd038dSYoshinobu Inoue "ICMP6 redirect rejected; " 231082cd038dSYoshinobu Inoue "not equal to gw-for-src=%s (must be same): " 231182cd038dSYoshinobu Inoue "%s\n", 23129977be4aSAlexander V. Chernikov ip6_sprintf(ip6buf, &nh6.nh_addr), 231333841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 231433841545SHajimu UMEMOTO goto bad; 231582cd038dSYoshinobu Inoue } 231682cd038dSYoshinobu Inoue } else { 231733841545SHajimu UMEMOTO nd6log((LOG_ERR, 231882cd038dSYoshinobu Inoue "ICMP6 redirect rejected; " 231982cd038dSYoshinobu Inoue "no route found for redirect dst: %s\n", 232033841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 232133841545SHajimu UMEMOTO goto bad; 232282cd038dSYoshinobu Inoue } 232382cd038dSYoshinobu Inoue } 232482cd038dSYoshinobu Inoue if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 232533841545SHajimu UMEMOTO nd6log((LOG_ERR, 232682cd038dSYoshinobu Inoue "ICMP6 redirect rejected; " 232782cd038dSYoshinobu Inoue "redirect dst must be unicast: %s\n", 232833841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 232933841545SHajimu UMEMOTO goto bad; 233082cd038dSYoshinobu Inoue } 233182cd038dSYoshinobu Inoue 233282cd038dSYoshinobu Inoue is_router = is_onlink = 0; 233382cd038dSYoshinobu Inoue if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 233482cd038dSYoshinobu Inoue is_router = 1; /* router case */ 233582cd038dSYoshinobu Inoue if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 233682cd038dSYoshinobu Inoue is_onlink = 1; /* on-link destination case */ 233782cd038dSYoshinobu Inoue if (!is_router && !is_onlink) { 233833841545SHajimu UMEMOTO nd6log((LOG_ERR, 233982cd038dSYoshinobu Inoue "ICMP6 redirect rejected; " 234082cd038dSYoshinobu Inoue "neither router case nor onlink case: %s\n", 234133841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 234233841545SHajimu UMEMOTO goto bad; 234382cd038dSYoshinobu Inoue } 234482cd038dSYoshinobu Inoue 234582cd038dSYoshinobu Inoue icmp6len -= sizeof(*nd_rd); 234682cd038dSYoshinobu Inoue nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 234782cd038dSYoshinobu Inoue if (nd6_options(&ndopts) < 0) { 234837c1ff48SGleb Smirnoff nd6log((LOG_INFO, "%s: invalid ND option, rejected: %s\n", 234937c1ff48SGleb Smirnoff __func__, icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 235033841545SHajimu UMEMOTO /* nd6_options have incremented stats */ 2351686cdd19SJun-ichiro itojun Hagino goto freeit; 235282cd038dSYoshinobu Inoue } 235382cd038dSYoshinobu Inoue 2354503f4e47SBjoern A. Zeeb lladdr = NULL; 2355503f4e47SBjoern A. Zeeb lladdrlen = 0; 235682cd038dSYoshinobu Inoue if (ndopts.nd_opts_tgt_lladdr) { 235782cd038dSYoshinobu Inoue lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 235882cd038dSYoshinobu Inoue lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 235982cd038dSYoshinobu Inoue } 236082cd038dSYoshinobu Inoue 236182cd038dSYoshinobu Inoue if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 236237c1ff48SGleb Smirnoff nd6log((LOG_INFO, "%s: lladdrlen mismatch for %s " 236382cd038dSYoshinobu Inoue "(if %d, icmp6 packet %d): %s\n", 236437c1ff48SGleb Smirnoff __func__, ip6_sprintf(ip6buf, &redtgt6), 23651d54aa3bSBjoern A. Zeeb ifp->if_addrlen, lladdrlen - 2, 236633841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 236733841545SHajimu UMEMOTO goto bad; 236882cd038dSYoshinobu Inoue } 236982cd038dSYoshinobu Inoue 2370bfbc08b8SBjoern A. Zeeb /* Validation passed. */ 2371bfbc08b8SBjoern A. Zeeb 237282cd038dSYoshinobu Inoue /* RFC 2461 8.3 */ 237382cd038dSYoshinobu Inoue nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 237482cd038dSYoshinobu Inoue is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 237582cd038dSYoshinobu Inoue 237617a03656SEric van Gyzen /* 237717a03656SEric van Gyzen * Install a gateway route in the better-router case or an interface 237817a03656SEric van Gyzen * route in the on-link-destination case. 237917a03656SEric van Gyzen */ 238017a03656SEric van Gyzen { 238182cd038dSYoshinobu Inoue struct sockaddr_in6 sdst; 238282cd038dSYoshinobu Inoue struct sockaddr_in6 sgw; 238382cd038dSYoshinobu Inoue struct sockaddr_in6 ssrc; 238417a03656SEric van Gyzen struct sockaddr *gw; 238517a03656SEric van Gyzen int rt_flags; 238681d5d46bSBjoern A. Zeeb u_int fibnum; 238782cd038dSYoshinobu Inoue 238882cd038dSYoshinobu Inoue bzero(&sdst, sizeof(sdst)); 238982cd038dSYoshinobu Inoue bzero(&ssrc, sizeof(ssrc)); 239017a03656SEric van Gyzen sdst.sin6_family = ssrc.sin6_family = AF_INET6; 239117a03656SEric van Gyzen sdst.sin6_len = ssrc.sin6_len = sizeof(struct sockaddr_in6); 239282cd038dSYoshinobu Inoue bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 239382cd038dSYoshinobu Inoue bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 239417a03656SEric van Gyzen rt_flags = RTF_HOST; 239517a03656SEric van Gyzen if (is_router) { 239617a03656SEric van Gyzen bzero(&sgw, sizeof(sgw)); 239717a03656SEric van Gyzen sgw.sin6_family = AF_INET6; 239817a03656SEric van Gyzen sgw.sin6_len = sizeof(struct sockaddr_in6); 239917a03656SEric van Gyzen bcopy(&redtgt6, &sgw.sin6_addr, 240017a03656SEric van Gyzen sizeof(struct in6_addr)); 240117a03656SEric van Gyzen gw = (struct sockaddr *)&sgw; 240217a03656SEric van Gyzen rt_flags |= RTF_GATEWAY; 240317a03656SEric van Gyzen } else 240417a03656SEric van Gyzen gw = ifp->if_addr->ifa_addr; 240581d5d46bSBjoern A. Zeeb for (fibnum = 0; fibnum < rt_numfibs; fibnum++) 240617a03656SEric van Gyzen in6_rtredirect((struct sockaddr *)&sdst, gw, 240717a03656SEric van Gyzen (struct sockaddr *)NULL, rt_flags, 240817a03656SEric van Gyzen (struct sockaddr *)&ssrc, fibnum); 240982cd038dSYoshinobu Inoue } 241082cd038dSYoshinobu Inoue /* finally update cached route in each socket via pfctlinput */ 241182cd038dSYoshinobu Inoue { 241282cd038dSYoshinobu Inoue struct sockaddr_in6 sdst; 241382cd038dSYoshinobu Inoue 241482cd038dSYoshinobu Inoue bzero(&sdst, sizeof(sdst)); 241582cd038dSYoshinobu Inoue sdst.sin6_family = AF_INET6; 241682cd038dSYoshinobu Inoue sdst.sin6_len = sizeof(struct sockaddr_in6); 241782cd038dSYoshinobu Inoue bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 241882cd038dSYoshinobu Inoue pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 241982cd038dSYoshinobu Inoue } 2420686cdd19SJun-ichiro itojun Hagino 2421686cdd19SJun-ichiro itojun Hagino freeit: 2422686cdd19SJun-ichiro itojun Hagino m_freem(m); 242333841545SHajimu UMEMOTO return; 242433841545SHajimu UMEMOTO 242533841545SHajimu UMEMOTO bad: 2426e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_badredirect); 242733841545SHajimu UMEMOTO m_freem(m); 242882cd038dSYoshinobu Inoue } 242982cd038dSYoshinobu Inoue 243082cd038dSYoshinobu Inoue void 24311272577eSXin LI icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 243282cd038dSYoshinobu Inoue { 243382cd038dSYoshinobu Inoue struct ifnet *ifp; /* my outgoing interface */ 243482cd038dSYoshinobu Inoue struct in6_addr *ifp_ll6; 243582cd038dSYoshinobu Inoue struct in6_addr *router_ll6; 243682cd038dSYoshinobu Inoue struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 243782cd038dSYoshinobu Inoue struct mbuf *m = NULL; /* newly allocated one */ 24381db8d1f8SAna Kukec struct m_tag *mtag; 243982cd038dSYoshinobu Inoue struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 244082cd038dSYoshinobu Inoue struct nd_redirect *nd_rd; 244156c423b0SKip Macy struct llentry *ln = NULL; 244282cd038dSYoshinobu Inoue size_t maxlen; 244382cd038dSYoshinobu Inoue u_char *p; 244482cd038dSYoshinobu Inoue struct ifnet *outif = NULL; 2445686cdd19SJun-ichiro itojun Hagino struct sockaddr_in6 src_sa; 2446686cdd19SJun-ichiro itojun Hagino 244749dc650cSAndrey V. Elsukov icmp6_errcount(ND_REDIRECT, 0); 244882cd038dSYoshinobu Inoue 244982cd038dSYoshinobu Inoue /* if we are not router, we don't send icmp6 redirect */ 2450603724d3SBjoern A. Zeeb if (!V_ip6_forwarding) 245182cd038dSYoshinobu Inoue goto fail; 245282cd038dSYoshinobu Inoue 245382cd038dSYoshinobu Inoue /* sanity check */ 245482cd038dSYoshinobu Inoue if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 245582cd038dSYoshinobu Inoue goto fail; 245682cd038dSYoshinobu Inoue 245782cd038dSYoshinobu Inoue /* 245882cd038dSYoshinobu Inoue * Address check: 245982cd038dSYoshinobu Inoue * the source address must identify a neighbor, and 246082cd038dSYoshinobu Inoue * the destination address must not be a multicast address 246182cd038dSYoshinobu Inoue * [RFC 2461, sec 8.2] 246282cd038dSYoshinobu Inoue */ 246382cd038dSYoshinobu Inoue sip6 = mtod(m0, struct ip6_hdr *); 2464686cdd19SJun-ichiro itojun Hagino bzero(&src_sa, sizeof(src_sa)); 2465686cdd19SJun-ichiro itojun Hagino src_sa.sin6_family = AF_INET6; 2466686cdd19SJun-ichiro itojun Hagino src_sa.sin6_len = sizeof(src_sa); 2467686cdd19SJun-ichiro itojun Hagino src_sa.sin6_addr = sip6->ip6_src; 2468686cdd19SJun-ichiro itojun Hagino if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 246982cd038dSYoshinobu Inoue goto fail; 247082cd038dSYoshinobu Inoue if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 247182cd038dSYoshinobu Inoue goto fail; /* what should we do here? */ 247282cd038dSYoshinobu Inoue 247382cd038dSYoshinobu Inoue /* rate limit */ 247482cd038dSYoshinobu Inoue if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 247582cd038dSYoshinobu Inoue goto fail; 247682cd038dSYoshinobu Inoue 247782cd038dSYoshinobu Inoue /* 247882cd038dSYoshinobu Inoue * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 247982cd038dSYoshinobu Inoue * we almost always ask for an mbuf cluster for simplicity. 248082cd038dSYoshinobu Inoue * (MHLEN < IPV6_MMTU is almost always true) 248182cd038dSYoshinobu Inoue */ 2482686cdd19SJun-ichiro itojun Hagino #if IPV6_MMTU >= MCLBYTES 2483686cdd19SJun-ichiro itojun Hagino # error assumption failed about IPV6_MMTU and MCLBYTES 2484686cdd19SJun-ichiro itojun Hagino #endif 24857b07d1beSGleb Smirnoff m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 24867b07d1beSGleb Smirnoff if (m == NULL) 248782cd038dSYoshinobu Inoue goto fail; 248881d5d46bSBjoern A. Zeeb M_SETFIB(m, rt->rt_fibnum); 248933841545SHajimu UMEMOTO maxlen = M_TRAILINGSPACE(m); 249082cd038dSYoshinobu Inoue maxlen = min(IPV6_MMTU, maxlen); 249182cd038dSYoshinobu Inoue /* just for safety */ 2492686cdd19SJun-ichiro itojun Hagino if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2493686cdd19SJun-ichiro itojun Hagino ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 249482cd038dSYoshinobu Inoue goto fail; 2495686cdd19SJun-ichiro itojun Hagino } 249682cd038dSYoshinobu Inoue 249782cd038dSYoshinobu Inoue { 249882cd038dSYoshinobu Inoue /* get ip6 linklocal address for ifp(my outgoing interface). */ 2499686cdd19SJun-ichiro itojun Hagino struct in6_ifaddr *ia; 2500686cdd19SJun-ichiro itojun Hagino if ((ia = in6ifa_ifpforlinklocal(ifp, 2501686cdd19SJun-ichiro itojun Hagino IN6_IFF_NOTREADY| 2502686cdd19SJun-ichiro itojun Hagino IN6_IFF_ANYCAST)) == NULL) 250382cd038dSYoshinobu Inoue goto fail; 250482cd038dSYoshinobu Inoue ifp_ll6 = &ia->ia_addr.sin6_addr; 25058c0fec80SRobert Watson /* XXXRW: reference released prematurely. */ 25068c0fec80SRobert Watson ifa_free(&ia->ia_ifa); 250782cd038dSYoshinobu Inoue } 250882cd038dSYoshinobu Inoue 250982cd038dSYoshinobu Inoue /* get ip6 linklocal address for the router. */ 251082cd038dSYoshinobu Inoue if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 251182cd038dSYoshinobu Inoue struct sockaddr_in6 *sin6; 251282cd038dSYoshinobu Inoue sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 251382cd038dSYoshinobu Inoue router_ll6 = &sin6->sin6_addr; 251482cd038dSYoshinobu Inoue if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 251582cd038dSYoshinobu Inoue router_ll6 = (struct in6_addr *)NULL; 251682cd038dSYoshinobu Inoue } else 251782cd038dSYoshinobu Inoue router_ll6 = (struct in6_addr *)NULL; 251882cd038dSYoshinobu Inoue 251982cd038dSYoshinobu Inoue /* ip6 */ 252082cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 252182cd038dSYoshinobu Inoue ip6->ip6_flow = 0; 2522686cdd19SJun-ichiro itojun Hagino ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2523686cdd19SJun-ichiro itojun Hagino ip6->ip6_vfc |= IPV6_VERSION; 252482cd038dSYoshinobu Inoue /* ip6->ip6_plen will be set later */ 252582cd038dSYoshinobu Inoue ip6->ip6_nxt = IPPROTO_ICMPV6; 252682cd038dSYoshinobu Inoue ip6->ip6_hlim = 255; 252782cd038dSYoshinobu Inoue /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 252882cd038dSYoshinobu Inoue bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 252982cd038dSYoshinobu Inoue bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 253082cd038dSYoshinobu Inoue 253182cd038dSYoshinobu Inoue /* ND Redirect */ 253282cd038dSYoshinobu Inoue nd_rd = (struct nd_redirect *)(ip6 + 1); 253382cd038dSYoshinobu Inoue nd_rd->nd_rd_type = ND_REDIRECT; 253482cd038dSYoshinobu Inoue nd_rd->nd_rd_code = 0; 253582cd038dSYoshinobu Inoue nd_rd->nd_rd_reserved = 0; 253682cd038dSYoshinobu Inoue if (rt->rt_flags & RTF_GATEWAY) { 253782cd038dSYoshinobu Inoue /* 253882cd038dSYoshinobu Inoue * nd_rd->nd_rd_target must be a link-local address in 253982cd038dSYoshinobu Inoue * better router cases. 254082cd038dSYoshinobu Inoue */ 254182cd038dSYoshinobu Inoue if (!router_ll6) 254282cd038dSYoshinobu Inoue goto fail; 254382cd038dSYoshinobu Inoue bcopy(router_ll6, &nd_rd->nd_rd_target, 254482cd038dSYoshinobu Inoue sizeof(nd_rd->nd_rd_target)); 254582cd038dSYoshinobu Inoue bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 254682cd038dSYoshinobu Inoue sizeof(nd_rd->nd_rd_dst)); 254782cd038dSYoshinobu Inoue } else { 254882cd038dSYoshinobu Inoue /* make sure redtgt == reddst */ 254982cd038dSYoshinobu Inoue bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 255082cd038dSYoshinobu Inoue sizeof(nd_rd->nd_rd_target)); 255182cd038dSYoshinobu Inoue bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 255282cd038dSYoshinobu Inoue sizeof(nd_rd->nd_rd_dst)); 255382cd038dSYoshinobu Inoue } 255482cd038dSYoshinobu Inoue 255582cd038dSYoshinobu Inoue p = (u_char *)(nd_rd + 1); 255682cd038dSYoshinobu Inoue 255782cd038dSYoshinobu Inoue if (!router_ll6) 255882cd038dSYoshinobu Inoue goto nolladdropt; 255982cd038dSYoshinobu Inoue 256082cd038dSYoshinobu Inoue { 256182cd038dSYoshinobu Inoue /* target lladdr option */ 256282cd038dSYoshinobu Inoue int len; 256382cd038dSYoshinobu Inoue struct nd_opt_hdr *nd_opt; 256482cd038dSYoshinobu Inoue char *lladdr; 256582cd038dSYoshinobu Inoue 25666e6b3f7cSQing Li ln = nd6_lookup(router_ll6, 0, ifp); 256756c423b0SKip Macy if (ln == NULL) 256882cd038dSYoshinobu Inoue goto nolladdropt; 25696e6b3f7cSQing Li 2570686cdd19SJun-ichiro itojun Hagino len = sizeof(*nd_opt) + ifp->if_addrlen; 2571686cdd19SJun-ichiro itojun Hagino len = (len + 7) & ~7; /* round by 8 */ 2572686cdd19SJun-ichiro itojun Hagino /* safety check */ 2573686cdd19SJun-ichiro itojun Hagino if (len + (p - (u_char *)ip6) > maxlen) 2574686cdd19SJun-ichiro itojun Hagino goto nolladdropt; 25756e6b3f7cSQing Li 25766e6b3f7cSQing Li if (ln->la_flags & LLE_VALID) { 257782cd038dSYoshinobu Inoue nd_opt = (struct nd_opt_hdr *)p; 257882cd038dSYoshinobu Inoue nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 257982cd038dSYoshinobu Inoue nd_opt->nd_opt_len = len >> 3; 258082cd038dSYoshinobu Inoue lladdr = (char *)(nd_opt + 1); 25814fb3a820SAlexander V. Chernikov bcopy(ln->ll_addr, lladdr, ifp->if_addrlen); 2582686cdd19SJun-ichiro itojun Hagino p += len; 258382cd038dSYoshinobu Inoue } 258482cd038dSYoshinobu Inoue } 258556c423b0SKip Macy nolladdropt: 258656c423b0SKip Macy if (ln != NULL) 258756c423b0SKip Macy LLE_RUNLOCK(ln); 258882cd038dSYoshinobu Inoue 258982cd038dSYoshinobu Inoue m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 259082cd038dSYoshinobu Inoue 259182cd038dSYoshinobu Inoue /* just to be safe */ 2592686cdd19SJun-ichiro itojun Hagino #ifdef M_DECRYPTED /*not openbsd*/ 259382cd038dSYoshinobu Inoue if (m0->m_flags & M_DECRYPTED) 259482cd038dSYoshinobu Inoue goto noredhdropt; 2595686cdd19SJun-ichiro itojun Hagino #endif 2596686cdd19SJun-ichiro itojun Hagino if (p - (u_char *)ip6 > maxlen) 2597686cdd19SJun-ichiro itojun Hagino goto noredhdropt; 259882cd038dSYoshinobu Inoue 259982cd038dSYoshinobu Inoue { 260082cd038dSYoshinobu Inoue /* redirected header option */ 260182cd038dSYoshinobu Inoue int len; 260282cd038dSYoshinobu Inoue struct nd_opt_rd_hdr *nd_opt_rh; 260382cd038dSYoshinobu Inoue 260482cd038dSYoshinobu Inoue /* 260582cd038dSYoshinobu Inoue * compute the maximum size for icmp6 redirect header option. 260682cd038dSYoshinobu Inoue * XXX room for auth header? 260782cd038dSYoshinobu Inoue */ 260882cd038dSYoshinobu Inoue len = maxlen - (p - (u_char *)ip6); 260982cd038dSYoshinobu Inoue len &= ~7; 261082cd038dSYoshinobu Inoue 261182cd038dSYoshinobu Inoue /* This is just for simplicity. */ 261282cd038dSYoshinobu Inoue if (m0->m_pkthdr.len != m0->m_len) { 261382cd038dSYoshinobu Inoue if (m0->m_next) { 261482cd038dSYoshinobu Inoue m_freem(m0->m_next); 261582cd038dSYoshinobu Inoue m0->m_next = NULL; 261682cd038dSYoshinobu Inoue } 261782cd038dSYoshinobu Inoue m0->m_pkthdr.len = m0->m_len; 261882cd038dSYoshinobu Inoue } 261982cd038dSYoshinobu Inoue 262082cd038dSYoshinobu Inoue /* 262182cd038dSYoshinobu Inoue * Redirected header option spec (RFC2461 4.6.3) talks nothing 262282cd038dSYoshinobu Inoue * about padding/truncate rule for the original IP packet. 262306cd0a3fSHajimu UMEMOTO * From the discussion on IPv6imp in Feb 1999, 262406cd0a3fSHajimu UMEMOTO * the consensus was: 262582cd038dSYoshinobu Inoue * - "attach as much as possible" is the goal 262606cd0a3fSHajimu UMEMOTO * - pad if not aligned (original size can be guessed by 262706cd0a3fSHajimu UMEMOTO * original ip6 header) 262882cd038dSYoshinobu Inoue * Following code adds the padding if it is simple enough, 262982cd038dSYoshinobu Inoue * and truncates if not. 263082cd038dSYoshinobu Inoue */ 263182cd038dSYoshinobu Inoue if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 263206cd0a3fSHajimu UMEMOTO panic("assumption failed in %s:%d", __FILE__, 263306cd0a3fSHajimu UMEMOTO __LINE__); 263482cd038dSYoshinobu Inoue 263582cd038dSYoshinobu Inoue if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 263682cd038dSYoshinobu Inoue /* not enough room, truncate */ 263706cd0a3fSHajimu UMEMOTO m0->m_pkthdr.len = m0->m_len = len - 263806cd0a3fSHajimu UMEMOTO sizeof(*nd_opt_rh); 263982cd038dSYoshinobu Inoue } else { 264082cd038dSYoshinobu Inoue /* enough room, pad or truncate */ 264182cd038dSYoshinobu Inoue size_t extra; 264282cd038dSYoshinobu Inoue 264382cd038dSYoshinobu Inoue extra = m0->m_pkthdr.len % 8; 264482cd038dSYoshinobu Inoue if (extra) { 264582cd038dSYoshinobu Inoue /* pad if easy enough, truncate if not */ 264682cd038dSYoshinobu Inoue if (8 - extra <= M_TRAILINGSPACE(m0)) { 264782cd038dSYoshinobu Inoue /* pad */ 264882cd038dSYoshinobu Inoue m0->m_len += (8 - extra); 264982cd038dSYoshinobu Inoue m0->m_pkthdr.len += (8 - extra); 265082cd038dSYoshinobu Inoue } else { 265182cd038dSYoshinobu Inoue /* truncate */ 265282cd038dSYoshinobu Inoue m0->m_pkthdr.len -= extra; 265382cd038dSYoshinobu Inoue m0->m_len -= extra; 265482cd038dSYoshinobu Inoue } 265582cd038dSYoshinobu Inoue } 265682cd038dSYoshinobu Inoue len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 265706cd0a3fSHajimu UMEMOTO m0->m_pkthdr.len = m0->m_len = len - 265806cd0a3fSHajimu UMEMOTO sizeof(*nd_opt_rh); 265982cd038dSYoshinobu Inoue } 266082cd038dSYoshinobu Inoue 266182cd038dSYoshinobu Inoue nd_opt_rh = (struct nd_opt_rd_hdr *)p; 266282cd038dSYoshinobu Inoue bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 266382cd038dSYoshinobu Inoue nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 266482cd038dSYoshinobu Inoue nd_opt_rh->nd_opt_rh_len = len >> 3; 266582cd038dSYoshinobu Inoue p += sizeof(*nd_opt_rh); 266682cd038dSYoshinobu Inoue m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 266782cd038dSYoshinobu Inoue 266882cd038dSYoshinobu Inoue /* connect m0 to m */ 2669db06e8a0SSUZUKI Shinsuke m_tag_delete_chain(m0, NULL); 2670db06e8a0SSUZUKI Shinsuke m0->m_flags &= ~M_PKTHDR; 267182cd038dSYoshinobu Inoue m->m_next = m0; 267282cd038dSYoshinobu Inoue m->m_pkthdr.len = m->m_len + m0->m_len; 2673db06e8a0SSUZUKI Shinsuke m0 = NULL; 267482cd038dSYoshinobu Inoue } 267582cd038dSYoshinobu Inoue noredhdropt:; 2676db06e8a0SSUZUKI Shinsuke if (m0) { 2677db06e8a0SSUZUKI Shinsuke m_freem(m0); 2678db06e8a0SSUZUKI Shinsuke m0 = NULL; 2679db06e8a0SSUZUKI Shinsuke } 268082cd038dSYoshinobu Inoue 26819a4f9608SHajimu UMEMOTO /* XXX: clear embedded link IDs in the inner header */ 26829a4f9608SHajimu UMEMOTO in6_clearscope(&sip6->ip6_src); 26839a4f9608SHajimu UMEMOTO in6_clearscope(&sip6->ip6_dst); 26849a4f9608SHajimu UMEMOTO in6_clearscope(&nd_rd->nd_rd_target); 26859a4f9608SHajimu UMEMOTO in6_clearscope(&nd_rd->nd_rd_dst); 268682cd038dSYoshinobu Inoue 268782cd038dSYoshinobu Inoue ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 268882cd038dSYoshinobu Inoue 268982cd038dSYoshinobu Inoue nd_rd->nd_rd_cksum = 0; 269006cd0a3fSHajimu UMEMOTO nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6, 269106cd0a3fSHajimu UMEMOTO sizeof(*ip6), ntohs(ip6->ip6_plen)); 269282cd038dSYoshinobu Inoue 26931db8d1f8SAna Kukec if (send_sendso_input_hook != NULL) { 26941db8d1f8SAna Kukec mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, sizeof(unsigned short), 26951db8d1f8SAna Kukec M_NOWAIT); 26961db8d1f8SAna Kukec if (mtag == NULL) 26971db8d1f8SAna Kukec goto fail; 26981db8d1f8SAna Kukec *(unsigned short *)(mtag + 1) = nd_rd->nd_rd_type; 26991db8d1f8SAna Kukec m_tag_prepend(m, mtag); 27001db8d1f8SAna Kukec } 27011db8d1f8SAna Kukec 270282cd038dSYoshinobu Inoue /* send the packet to outside... */ 27035d846453SSam Leffler ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 270482cd038dSYoshinobu Inoue if (outif) { 270582cd038dSYoshinobu Inoue icmp6_ifstat_inc(outif, ifs6_out_msg); 270682cd038dSYoshinobu Inoue icmp6_ifstat_inc(outif, ifs6_out_redirect); 270782cd038dSYoshinobu Inoue } 2708e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_outhist[ND_REDIRECT]); 270982cd038dSYoshinobu Inoue 271082cd038dSYoshinobu Inoue return; 271182cd038dSYoshinobu Inoue 271282cd038dSYoshinobu Inoue fail: 271382cd038dSYoshinobu Inoue if (m) 271482cd038dSYoshinobu Inoue m_freem(m); 271582cd038dSYoshinobu Inoue if (m0) 271682cd038dSYoshinobu Inoue m_freem(m0); 271782cd038dSYoshinobu Inoue } 271882cd038dSYoshinobu Inoue 271982cd038dSYoshinobu Inoue /* 272082cd038dSYoshinobu Inoue * ICMPv6 socket option processing. 272182cd038dSYoshinobu Inoue */ 272282cd038dSYoshinobu Inoue int 27231272577eSXin LI icmp6_ctloutput(struct socket *so, struct sockopt *sopt) 272482cd038dSYoshinobu Inoue { 272582cd038dSYoshinobu Inoue int error = 0; 272682cd038dSYoshinobu Inoue int optlen; 272733841545SHajimu UMEMOTO struct inpcb *inp = sotoinpcb(so); 272882cd038dSYoshinobu Inoue int level, op, optname; 272982cd038dSYoshinobu Inoue 273082cd038dSYoshinobu Inoue if (sopt) { 273182cd038dSYoshinobu Inoue level = sopt->sopt_level; 273282cd038dSYoshinobu Inoue op = sopt->sopt_dir; 273382cd038dSYoshinobu Inoue optname = sopt->sopt_name; 273482cd038dSYoshinobu Inoue optlen = sopt->sopt_valsize; 273582cd038dSYoshinobu Inoue } else 273682cd038dSYoshinobu Inoue level = op = optname = optlen = 0; 273733841545SHajimu UMEMOTO 273882cd038dSYoshinobu Inoue if (level != IPPROTO_ICMPV6) { 273982cd038dSYoshinobu Inoue return EINVAL; 274082cd038dSYoshinobu Inoue } 274182cd038dSYoshinobu Inoue 274282cd038dSYoshinobu Inoue switch (op) { 274382cd038dSYoshinobu Inoue case PRCO_SETOPT: 274482cd038dSYoshinobu Inoue switch (optname) { 274582cd038dSYoshinobu Inoue case ICMP6_FILTER: 274682cd038dSYoshinobu Inoue { 2747ae89d5a3SRobert Watson struct icmp6_filter ic6f; 274882cd038dSYoshinobu Inoue 2749ae89d5a3SRobert Watson if (optlen != sizeof(ic6f)) { 275082cd038dSYoshinobu Inoue error = EMSGSIZE; 275182cd038dSYoshinobu Inoue break; 275282cd038dSYoshinobu Inoue } 2753ae89d5a3SRobert Watson error = sooptcopyin(sopt, &ic6f, optlen, optlen); 2754ae89d5a3SRobert Watson if (error == 0) { 2755ae89d5a3SRobert Watson INP_WLOCK(inp); 2756ae89d5a3SRobert Watson *inp->in6p_icmp6filt = ic6f; 2757ae89d5a3SRobert Watson INP_WUNLOCK(inp); 2758ae89d5a3SRobert Watson } 275982cd038dSYoshinobu Inoue break; 276082cd038dSYoshinobu Inoue } 276182cd038dSYoshinobu Inoue 276282cd038dSYoshinobu Inoue default: 276382cd038dSYoshinobu Inoue error = ENOPROTOOPT; 276482cd038dSYoshinobu Inoue break; 276582cd038dSYoshinobu Inoue } 276682cd038dSYoshinobu Inoue break; 276782cd038dSYoshinobu Inoue 276882cd038dSYoshinobu Inoue case PRCO_GETOPT: 276982cd038dSYoshinobu Inoue switch (optname) { 277082cd038dSYoshinobu Inoue case ICMP6_FILTER: 277182cd038dSYoshinobu Inoue { 2772ae89d5a3SRobert Watson struct icmp6_filter ic6f; 2773ae89d5a3SRobert Watson 2774ae89d5a3SRobert Watson INP_RLOCK(inp); 2775ae89d5a3SRobert Watson ic6f = *inp->in6p_icmp6filt; 2776ae89d5a3SRobert Watson INP_RUNLOCK(inp); 2777ae89d5a3SRobert Watson error = sooptcopyout(sopt, &ic6f, sizeof(ic6f)); 277882cd038dSYoshinobu Inoue break; 277982cd038dSYoshinobu Inoue } 278082cd038dSYoshinobu Inoue 278182cd038dSYoshinobu Inoue default: 278282cd038dSYoshinobu Inoue error = ENOPROTOOPT; 278382cd038dSYoshinobu Inoue break; 278482cd038dSYoshinobu Inoue } 278582cd038dSYoshinobu Inoue break; 278682cd038dSYoshinobu Inoue } 278782cd038dSYoshinobu Inoue 278882cd038dSYoshinobu Inoue return (error); 278982cd038dSYoshinobu Inoue } 279082cd038dSYoshinobu Inoue 279182cd038dSYoshinobu Inoue /* 279282cd038dSYoshinobu Inoue * Perform rate limit check. 279382cd038dSYoshinobu Inoue * Returns 0 if it is okay to send the icmp6 packet. 279482cd038dSYoshinobu Inoue * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 279582cd038dSYoshinobu Inoue * limitation. 279682cd038dSYoshinobu Inoue * 279782cd038dSYoshinobu Inoue * XXX per-destination/type check necessary? 27981272577eSXin LI * 27991272577eSXin LI * dst - not used at this moment 28001272577eSXin LI * type - not used at this moment 28011272577eSXin LI * code - not used at this moment 280282cd038dSYoshinobu Inoue */ 280382cd038dSYoshinobu Inoue static int 28041272577eSXin LI icmp6_ratelimit(const struct in6_addr *dst, const int type, 28051272577eSXin LI const int code) 280682cd038dSYoshinobu Inoue { 2807686cdd19SJun-ichiro itojun Hagino int ret; 280882cd038dSYoshinobu Inoue 2809686cdd19SJun-ichiro itojun Hagino ret = 0; /* okay to send */ 281082cd038dSYoshinobu Inoue 2811686cdd19SJun-ichiro itojun Hagino /* PPS limit */ 2812603724d3SBjoern A. Zeeb if (!ppsratecheck(&V_icmp6errppslim_last, &V_icmp6errpps_count, 2813603724d3SBjoern A. Zeeb V_icmp6errppslim)) { 281482cd038dSYoshinobu Inoue /* The packet is subject to rate limit */ 2815686cdd19SJun-ichiro itojun Hagino ret++; 281682cd038dSYoshinobu Inoue } 281782cd038dSYoshinobu Inoue 2818686cdd19SJun-ichiro itojun Hagino return ret; 281982cd038dSYoshinobu Inoue } 2820