1caf43b02SWarner Losh /*- 282cd038dSYoshinobu Inoue * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 382cd038dSYoshinobu Inoue * All rights reserved. 482cd038dSYoshinobu Inoue * 582cd038dSYoshinobu Inoue * Redistribution and use in source and binary forms, with or without 682cd038dSYoshinobu Inoue * modification, are permitted provided that the following conditions 782cd038dSYoshinobu Inoue * are met: 882cd038dSYoshinobu Inoue * 1. Redistributions of source code must retain the above copyright 982cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer. 1082cd038dSYoshinobu Inoue * 2. Redistributions in binary form must reproduce the above copyright 1182cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer in the 1282cd038dSYoshinobu Inoue * documentation and/or other materials provided with the distribution. 1382cd038dSYoshinobu Inoue * 3. Neither the name of the project nor the names of its contributors 1482cd038dSYoshinobu Inoue * may be used to endorse or promote products derived from this software 1582cd038dSYoshinobu Inoue * without specific prior written permission. 1682cd038dSYoshinobu Inoue * 1782cd038dSYoshinobu Inoue * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 1882cd038dSYoshinobu Inoue * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1982cd038dSYoshinobu Inoue * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2082cd038dSYoshinobu Inoue * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2182cd038dSYoshinobu Inoue * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2282cd038dSYoshinobu Inoue * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2382cd038dSYoshinobu Inoue * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2482cd038dSYoshinobu Inoue * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2582cd038dSYoshinobu Inoue * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2682cd038dSYoshinobu Inoue * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2782cd038dSYoshinobu Inoue * SUCH DAMAGE. 28b48287a3SDavid E. O'Brien * 29b48287a3SDavid E. O'Brien * $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $ 3082cd038dSYoshinobu Inoue */ 3182cd038dSYoshinobu Inoue 32caf43b02SWarner Losh /*- 3382cd038dSYoshinobu Inoue * Copyright (c) 1982, 1986, 1988, 1993 3482cd038dSYoshinobu Inoue * The Regents of the University of California. All rights reserved. 3582cd038dSYoshinobu Inoue * 3682cd038dSYoshinobu Inoue * Redistribution and use in source and binary forms, with or without 3782cd038dSYoshinobu Inoue * modification, are permitted provided that the following conditions 3882cd038dSYoshinobu Inoue * are met: 3982cd038dSYoshinobu Inoue * 1. Redistributions of source code must retain the above copyright 4082cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer. 4182cd038dSYoshinobu Inoue * 2. Redistributions in binary form must reproduce the above copyright 4282cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer in the 4382cd038dSYoshinobu Inoue * documentation and/or other materials provided with the distribution. 44*fbbd9655SWarner Losh * 3. Neither the name of the University nor the names of its contributors 4582cd038dSYoshinobu Inoue * may be used to endorse or promote products derived from this software 4682cd038dSYoshinobu Inoue * without specific prior written permission. 4782cd038dSYoshinobu Inoue * 4882cd038dSYoshinobu Inoue * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 4982cd038dSYoshinobu Inoue * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 5082cd038dSYoshinobu Inoue * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 5182cd038dSYoshinobu Inoue * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 5282cd038dSYoshinobu Inoue * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 5382cd038dSYoshinobu Inoue * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 5482cd038dSYoshinobu Inoue * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 5582cd038dSYoshinobu Inoue * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 5682cd038dSYoshinobu Inoue * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5782cd038dSYoshinobu Inoue * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5882cd038dSYoshinobu Inoue * SUCH DAMAGE. 5982cd038dSYoshinobu Inoue * 6082cd038dSYoshinobu Inoue * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 6182cd038dSYoshinobu Inoue */ 6282cd038dSYoshinobu Inoue 63b48287a3SDavid E. O'Brien #include <sys/cdefs.h> 64b48287a3SDavid E. O'Brien __FBSDID("$FreeBSD$"); 65b48287a3SDavid E. O'Brien 66f0cace5dSRobert Watson #define MBUF_PRIVATE /* XXXRW: Optimisation tries to avoid M_EXT mbufs */ 67f0cace5dSRobert Watson 68686cdd19SJun-ichiro itojun Hagino #include "opt_inet.h" 69686cdd19SJun-ichiro itojun Hagino #include "opt_inet6.h" 7082cd038dSYoshinobu Inoue 7182cd038dSYoshinobu Inoue #include <sys/param.h> 72960ed29cSSeigo Tanimura #include <sys/domain.h> 7376ca6f88SJamie Gritton #include <sys/jail.h> 74960ed29cSSeigo Tanimura #include <sys/kernel.h> 75960ed29cSSeigo Tanimura #include <sys/lock.h> 7633841545SHajimu UMEMOTO #include <sys/malloc.h> 7782cd038dSYoshinobu Inoue #include <sys/mbuf.h> 78530c0060SRobert Watson #include <sys/proc.h> 7982cd038dSYoshinobu Inoue #include <sys/protosw.h> 80960ed29cSSeigo Tanimura #include <sys/signalvar.h> 8182cd038dSYoshinobu Inoue #include <sys/socket.h> 8282cd038dSYoshinobu Inoue #include <sys/socketvar.h> 83960ed29cSSeigo Tanimura #include <sys/sx.h> 8482cd038dSYoshinobu Inoue #include <sys/syslog.h> 85960ed29cSSeigo Tanimura #include <sys/systm.h> 86960ed29cSSeigo Tanimura #include <sys/time.h> 8782cd038dSYoshinobu Inoue 8882cd038dSYoshinobu Inoue #include <net/if.h> 8976039bc8SGleb Smirnoff #include <net/if_var.h> 9082cd038dSYoshinobu Inoue #include <net/if_dl.h> 916e6b3f7cSQing Li #include <net/if_llatbl.h> 9282cd038dSYoshinobu Inoue #include <net/if_types.h> 93960ed29cSSeigo Tanimura #include <net/route.h> 944b79449eSBjoern A. Zeeb #include <net/vnet.h> 9582cd038dSYoshinobu Inoue 9682cd038dSYoshinobu Inoue #include <netinet/in.h> 97960ed29cSSeigo Tanimura #include <netinet/in_pcb.h> 9882cd038dSYoshinobu Inoue #include <netinet/in_var.h> 99686cdd19SJun-ichiro itojun Hagino #include <netinet/ip6.h> 100686cdd19SJun-ichiro itojun Hagino #include <netinet/icmp6.h> 10197d8d152SAndre Oppermann #include <netinet/tcp_var.h> 1024b79449eSBjoern A. Zeeb 1039977be4aSAlexander V. Chernikov #include <netinet6/in6_fib.h> 10482cd038dSYoshinobu Inoue #include <netinet6/in6_ifattach.h> 105960ed29cSSeigo Tanimura #include <netinet6/in6_pcb.h> 10682cd038dSYoshinobu Inoue #include <netinet6/ip6protosw.h> 107960ed29cSSeigo Tanimura #include <netinet6/ip6_var.h> 108a1f7e5f8SHajimu UMEMOTO #include <netinet6/scope6_var.h> 109960ed29cSSeigo Tanimura #include <netinet6/mld6_var.h> 110960ed29cSSeigo Tanimura #include <netinet6/nd6.h> 1111db8d1f8SAna Kukec #include <netinet6/send.h> 11282cd038dSYoshinobu Inoue 11382cd038dSYoshinobu Inoue extern struct domain inet6domain; 11497021c24SMarko Zec 115a786f679SAndrey V. Elsukov VNET_PCPUSTAT_DEFINE(struct icmp6stat, icmp6stat); 116a786f679SAndrey V. Elsukov VNET_PCPUSTAT_SYSINIT(icmp6stat); 117a786f679SAndrey V. Elsukov 118a786f679SAndrey V. Elsukov #ifdef VIMAGE 119a786f679SAndrey V. Elsukov VNET_PCPUSTAT_SYSUNINIT(icmp6stat); 120a786f679SAndrey V. Elsukov #endif /* VIMAGE */ 12182cea7e6SBjoern A. Zeeb 122eddfbb76SRobert Watson VNET_DECLARE(struct inpcbinfo, ripcbinfo); 123eddfbb76SRobert Watson VNET_DECLARE(struct inpcbhead, ripcb); 124eddfbb76SRobert Watson VNET_DECLARE(int, icmp6errppslim); 1253e288e62SDimitry Andric static VNET_DEFINE(int, icmp6errpps_count) = 0; 1263e288e62SDimitry Andric static VNET_DEFINE(struct timeval, icmp6errppslim_last); 127eddfbb76SRobert Watson VNET_DECLARE(int, icmp6_nodeinfo); 12882cd038dSYoshinobu Inoue 1291e77c105SRobert Watson #define V_ripcbinfo VNET(ripcbinfo) 1301e77c105SRobert Watson #define V_ripcb VNET(ripcb) 1311e77c105SRobert Watson #define V_icmp6errppslim VNET(icmp6errppslim) 1321e77c105SRobert Watson #define V_icmp6errpps_count VNET(icmp6errpps_count) 1331e77c105SRobert Watson #define V_icmp6errppslim_last VNET(icmp6errppslim_last) 13482cea7e6SBjoern A. Zeeb #define V_icmp6_nodeinfo VNET(icmp6_nodeinfo) 13544e33a07SMarko Zec 13649dc650cSAndrey V. Elsukov static void icmp6_errcount(int, int); 1379233d8f3SDavid E. O'Brien static int icmp6_rip6_input(struct mbuf **, int); 1389233d8f3SDavid E. O'Brien static int icmp6_ratelimit(const struct in6_addr *, const int, const int); 1396f56329aSXin LI static const char *icmp6_redirect_diag(struct in6_addr *, 1406f56329aSXin LI struct in6_addr *, struct in6_addr *); 1419233d8f3SDavid E. O'Brien static struct mbuf *ni6_input(struct mbuf *, int); 1429233d8f3SDavid E. O'Brien static struct mbuf *ni6_nametodns(const char *, int, int); 1439233d8f3SDavid E. O'Brien static int ni6_dnsmatch(const char *, int, const char *, int); 1446f56329aSXin LI static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *, 1456f56329aSXin LI struct ifnet **, struct in6_addr *); 1466f56329aSXin LI static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 1476f56329aSXin LI struct ifnet *, int); 1489233d8f3SDavid E. O'Brien static int icmp6_notify_error(struct mbuf **, int, int, int); 14982cd038dSYoshinobu Inoue 150315e3e38SRobert Watson /* 151315e3e38SRobert Watson * Kernel module interface for updating icmp6stat. The argument is an index 152315e3e38SRobert Watson * into icmp6stat treated as an array of u_quad_t. While this encodes the 153315e3e38SRobert Watson * general layout of icmp6stat into the caller, it doesn't encode its 154315e3e38SRobert Watson * location, so that future changes to add, for example, per-CPU stats 155315e3e38SRobert Watson * support won't cause binary compatibility problems for kernel modules. 156315e3e38SRobert Watson */ 157315e3e38SRobert Watson void 158315e3e38SRobert Watson kmod_icmp6stat_inc(int statnum) 159315e3e38SRobert Watson { 160315e3e38SRobert Watson 161a786f679SAndrey V. Elsukov counter_u64_add(VNET(icmp6stat)[statnum], 1); 162315e3e38SRobert Watson } 163315e3e38SRobert Watson 164686cdd19SJun-ichiro itojun Hagino static void 16549dc650cSAndrey V. Elsukov icmp6_errcount(int type, int code) 166686cdd19SJun-ichiro itojun Hagino { 167686cdd19SJun-ichiro itojun Hagino switch (type) { 168686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH: 169686cdd19SJun-ichiro itojun Hagino switch (code) { 170686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_NOROUTE: 17149dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_odst_unreach_noroute); 172686cdd19SJun-ichiro itojun Hagino return; 173686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_ADMIN: 17449dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_odst_unreach_admin); 175686cdd19SJun-ichiro itojun Hagino return; 176686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_BEYONDSCOPE: 17749dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_odst_unreach_beyondscope); 178686cdd19SJun-ichiro itojun Hagino return; 179686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_ADDR: 18049dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_odst_unreach_addr); 181686cdd19SJun-ichiro itojun Hagino return; 182686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_NOPORT: 18349dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_odst_unreach_noport); 184686cdd19SJun-ichiro itojun Hagino return; 185686cdd19SJun-ichiro itojun Hagino } 186686cdd19SJun-ichiro itojun Hagino break; 187686cdd19SJun-ichiro itojun Hagino case ICMP6_PACKET_TOO_BIG: 18849dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_opacket_too_big); 189686cdd19SJun-ichiro itojun Hagino return; 190686cdd19SJun-ichiro itojun Hagino case ICMP6_TIME_EXCEEDED: 191686cdd19SJun-ichiro itojun Hagino switch (code) { 192686cdd19SJun-ichiro itojun Hagino case ICMP6_TIME_EXCEED_TRANSIT: 19349dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_otime_exceed_transit); 194686cdd19SJun-ichiro itojun Hagino return; 195686cdd19SJun-ichiro itojun Hagino case ICMP6_TIME_EXCEED_REASSEMBLY: 19649dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_otime_exceed_reassembly); 197686cdd19SJun-ichiro itojun Hagino return; 198686cdd19SJun-ichiro itojun Hagino } 199686cdd19SJun-ichiro itojun Hagino break; 200686cdd19SJun-ichiro itojun Hagino case ICMP6_PARAM_PROB: 201686cdd19SJun-ichiro itojun Hagino switch (code) { 202686cdd19SJun-ichiro itojun Hagino case ICMP6_PARAMPROB_HEADER: 20349dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_oparamprob_header); 204686cdd19SJun-ichiro itojun Hagino return; 205686cdd19SJun-ichiro itojun Hagino case ICMP6_PARAMPROB_NEXTHEADER: 20649dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_oparamprob_nextheader); 207686cdd19SJun-ichiro itojun Hagino return; 208686cdd19SJun-ichiro itojun Hagino case ICMP6_PARAMPROB_OPTION: 20949dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_oparamprob_option); 210686cdd19SJun-ichiro itojun Hagino return; 211686cdd19SJun-ichiro itojun Hagino } 212686cdd19SJun-ichiro itojun Hagino break; 213686cdd19SJun-ichiro itojun Hagino case ND_REDIRECT: 21449dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_oredirect); 215686cdd19SJun-ichiro itojun Hagino return; 216686cdd19SJun-ichiro itojun Hagino } 21749dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_ounknown); 218686cdd19SJun-ichiro itojun Hagino } 219686cdd19SJun-ichiro itojun Hagino 22082cd038dSYoshinobu Inoue /* 221a1f7e5f8SHajimu UMEMOTO * A wrapper function for icmp6_error() necessary when the erroneous packet 222a1f7e5f8SHajimu UMEMOTO * may not contain enough scope zone information. 223a1f7e5f8SHajimu UMEMOTO */ 224a1f7e5f8SHajimu UMEMOTO void 2251272577eSXin LI icmp6_error2(struct mbuf *m, int type, int code, int param, 2261272577eSXin LI struct ifnet *ifp) 227a1f7e5f8SHajimu UMEMOTO { 228a1f7e5f8SHajimu UMEMOTO struct ip6_hdr *ip6; 229a1f7e5f8SHajimu UMEMOTO 230a1f7e5f8SHajimu UMEMOTO if (ifp == NULL) 231a1f7e5f8SHajimu UMEMOTO return; 232a1f7e5f8SHajimu UMEMOTO 233a1f7e5f8SHajimu UMEMOTO #ifndef PULLDOWN_TEST 234a1f7e5f8SHajimu UMEMOTO IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 235a1f7e5f8SHajimu UMEMOTO #else 236a1f7e5f8SHajimu UMEMOTO if (m->m_len < sizeof(struct ip6_hdr)) { 237a1f7e5f8SHajimu UMEMOTO m = m_pullup(m, sizeof(struct ip6_hdr)); 238a1f7e5f8SHajimu UMEMOTO if (m == NULL) 239a1f7e5f8SHajimu UMEMOTO return; 240a1f7e5f8SHajimu UMEMOTO } 241a1f7e5f8SHajimu UMEMOTO #endif 242a1f7e5f8SHajimu UMEMOTO 243a1f7e5f8SHajimu UMEMOTO ip6 = mtod(m, struct ip6_hdr *); 244a1f7e5f8SHajimu UMEMOTO 245a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) 246a1f7e5f8SHajimu UMEMOTO return; 247a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 248a1f7e5f8SHajimu UMEMOTO return; 249a1f7e5f8SHajimu UMEMOTO 250a1f7e5f8SHajimu UMEMOTO icmp6_error(m, type, code, param); 251a1f7e5f8SHajimu UMEMOTO } 252a1f7e5f8SHajimu UMEMOTO 253a1f7e5f8SHajimu UMEMOTO /* 25482cd038dSYoshinobu Inoue * Generate an error packet of type error in response to bad IP6 packet. 25582cd038dSYoshinobu Inoue */ 25682cd038dSYoshinobu Inoue void 2571272577eSXin LI icmp6_error(struct mbuf *m, int type, int code, int param) 25882cd038dSYoshinobu Inoue { 25982cd038dSYoshinobu Inoue struct ip6_hdr *oip6, *nip6; 26082cd038dSYoshinobu Inoue struct icmp6_hdr *icmp6; 261686cdd19SJun-ichiro itojun Hagino u_int preplen; 26282cd038dSYoshinobu Inoue int off; 263686cdd19SJun-ichiro itojun Hagino int nxt; 26482cd038dSYoshinobu Inoue 265e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_error); 26682cd038dSYoshinobu Inoue 267686cdd19SJun-ichiro itojun Hagino /* count per-type-code statistics */ 26849dc650cSAndrey V. Elsukov icmp6_errcount(type, code); 26982cd038dSYoshinobu Inoue 270686cdd19SJun-ichiro itojun Hagino #ifdef M_DECRYPTED /*not openbsd*/ 271686cdd19SJun-ichiro itojun Hagino if (m->m_flags & M_DECRYPTED) { 272e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_canterror); 273686cdd19SJun-ichiro itojun Hagino goto freeit; 274686cdd19SJun-ichiro itojun Hagino } 275686cdd19SJun-ichiro itojun Hagino #endif 276686cdd19SJun-ichiro itojun Hagino 277686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 278686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 279686cdd19SJun-ichiro itojun Hagino #else 280686cdd19SJun-ichiro itojun Hagino if (m->m_len < sizeof(struct ip6_hdr)) { 281686cdd19SJun-ichiro itojun Hagino m = m_pullup(m, sizeof(struct ip6_hdr)); 282686cdd19SJun-ichiro itojun Hagino if (m == NULL) 283686cdd19SJun-ichiro itojun Hagino return; 284686cdd19SJun-ichiro itojun Hagino } 285686cdd19SJun-ichiro itojun Hagino #endif 28682cd038dSYoshinobu Inoue oip6 = mtod(m, struct ip6_hdr *); 28782cd038dSYoshinobu Inoue 28882cd038dSYoshinobu Inoue /* 289f95d4633SHajimu UMEMOTO * If the destination address of the erroneous packet is a multicast 290f95d4633SHajimu UMEMOTO * address, or the packet was sent using link-layer multicast, 291f95d4633SHajimu UMEMOTO * we should basically suppress sending an error (RFC 2463, Section 292f95d4633SHajimu UMEMOTO * 2.4). 293f95d4633SHajimu UMEMOTO * We have two exceptions (the item e.2 in that section): 2941767c520SBjoern A. Zeeb * - the Packet Too Big message can be sent for path MTU discovery. 295f95d4633SHajimu UMEMOTO * - the Parameter Problem Message that can be allowed an icmp6 error 296f95d4633SHajimu UMEMOTO * in the option type field. This check has been done in 297f95d4633SHajimu UMEMOTO * ip6_unknown_opt(), so we can just check the type and code. 29882cd038dSYoshinobu Inoue */ 29982cd038dSYoshinobu Inoue if ((m->m_flags & (M_BCAST|M_MCAST) || 30082cd038dSYoshinobu Inoue IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 30182cd038dSYoshinobu Inoue (type != ICMP6_PACKET_TOO_BIG && 30282cd038dSYoshinobu Inoue (type != ICMP6_PARAM_PROB || 30382cd038dSYoshinobu Inoue code != ICMP6_PARAMPROB_OPTION))) 30482cd038dSYoshinobu Inoue goto freeit; 30582cd038dSYoshinobu Inoue 306f95d4633SHajimu UMEMOTO /* 307f95d4633SHajimu UMEMOTO * RFC 2463, 2.4 (e.5): source address check. 308f95d4633SHajimu UMEMOTO * XXX: the case of anycast source? 309f95d4633SHajimu UMEMOTO */ 31082cd038dSYoshinobu Inoue if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 31182cd038dSYoshinobu Inoue IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 31282cd038dSYoshinobu Inoue goto freeit; 31382cd038dSYoshinobu Inoue 31482cd038dSYoshinobu Inoue /* 315686cdd19SJun-ichiro itojun Hagino * If we are about to send ICMPv6 against ICMPv6 error/redirect, 316686cdd19SJun-ichiro itojun Hagino * don't do it. 31782cd038dSYoshinobu Inoue */ 318686cdd19SJun-ichiro itojun Hagino nxt = -1; 319686cdd19SJun-ichiro itojun Hagino off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 320686cdd19SJun-ichiro itojun Hagino if (off >= 0 && nxt == IPPROTO_ICMPV6) { 32182cd038dSYoshinobu Inoue struct icmp6_hdr *icp; 32282cd038dSYoshinobu Inoue 323686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 32482cd038dSYoshinobu Inoue IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), ); 32582cd038dSYoshinobu Inoue icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 326686cdd19SJun-ichiro itojun Hagino #else 327686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 328686cdd19SJun-ichiro itojun Hagino sizeof(*icp)); 329686cdd19SJun-ichiro itojun Hagino if (icp == NULL) { 330e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 331686cdd19SJun-ichiro itojun Hagino return; 332686cdd19SJun-ichiro itojun Hagino } 333686cdd19SJun-ichiro itojun Hagino #endif 334686cdd19SJun-ichiro itojun Hagino if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 335686cdd19SJun-ichiro itojun Hagino icp->icmp6_type == ND_REDIRECT) { 33682cd038dSYoshinobu Inoue /* 33782cd038dSYoshinobu Inoue * ICMPv6 error 33882cd038dSYoshinobu Inoue * Special case: for redirect (which is 33982cd038dSYoshinobu Inoue * informational) we must not send icmp6 error. 34082cd038dSYoshinobu Inoue */ 341e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_canterror); 34282cd038dSYoshinobu Inoue goto freeit; 34382cd038dSYoshinobu Inoue } else { 344686cdd19SJun-ichiro itojun Hagino /* ICMPv6 informational - send the error */ 34582cd038dSYoshinobu Inoue } 346686cdd19SJun-ichiro itojun Hagino } else { 347686cdd19SJun-ichiro itojun Hagino /* non-ICMPv6 - send the error */ 34882cd038dSYoshinobu Inoue } 34982cd038dSYoshinobu Inoue 35082cd038dSYoshinobu Inoue oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 35182cd038dSYoshinobu Inoue 35282cd038dSYoshinobu Inoue /* Finally, do rate limitation check. */ 35382cd038dSYoshinobu Inoue if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 354e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_toofreq); 35582cd038dSYoshinobu Inoue goto freeit; 35682cd038dSYoshinobu Inoue } 35782cd038dSYoshinobu Inoue 35882cd038dSYoshinobu Inoue /* 35982cd038dSYoshinobu Inoue * OK, ICMP6 can be generated. 36082cd038dSYoshinobu Inoue */ 36182cd038dSYoshinobu Inoue 36282cd038dSYoshinobu Inoue if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 36382cd038dSYoshinobu Inoue m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 36482cd038dSYoshinobu Inoue 365686cdd19SJun-ichiro itojun Hagino preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 366eb1b1807SGleb Smirnoff M_PREPEND(m, preplen, M_NOWAIT); /* FIB is also copied over. */ 36782cd038dSYoshinobu Inoue if (m == NULL) { 36833841545SHajimu UMEMOTO nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__)); 36982cd038dSYoshinobu Inoue return; 37082cd038dSYoshinobu Inoue } 37182cd038dSYoshinobu Inoue 37282cd038dSYoshinobu Inoue nip6 = mtod(m, struct ip6_hdr *); 37382cd038dSYoshinobu Inoue nip6->ip6_src = oip6->ip6_src; 37482cd038dSYoshinobu Inoue nip6->ip6_dst = oip6->ip6_dst; 37582cd038dSYoshinobu Inoue 3769a4f9608SHajimu UMEMOTO in6_clearscope(&oip6->ip6_src); 3779a4f9608SHajimu UMEMOTO in6_clearscope(&oip6->ip6_dst); 37882cd038dSYoshinobu Inoue 37982cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)(nip6 + 1); 38082cd038dSYoshinobu Inoue icmp6->icmp6_type = type; 38182cd038dSYoshinobu Inoue icmp6->icmp6_code = code; 38282cd038dSYoshinobu Inoue icmp6->icmp6_pptr = htonl((u_int32_t)param); 38382cd038dSYoshinobu Inoue 38433841545SHajimu UMEMOTO /* 38533841545SHajimu UMEMOTO * icmp6_reflect() is designed to be in the input path. 386cd0fdcf7SHajimu UMEMOTO * icmp6_error() can be called from both input and output path, 38733841545SHajimu UMEMOTO * and if we are in output path rcvif could contain bogus value. 38833841545SHajimu UMEMOTO * clear m->m_pkthdr.rcvif for safety, we should have enough scope 38933841545SHajimu UMEMOTO * information in ip header (nip6). 39033841545SHajimu UMEMOTO */ 39133841545SHajimu UMEMOTO m->m_pkthdr.rcvif = NULL; 39233841545SHajimu UMEMOTO 393e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_outhist[type]); 39482cd038dSYoshinobu Inoue icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 395686cdd19SJun-ichiro itojun Hagino 396686cdd19SJun-ichiro itojun Hagino return; 397686cdd19SJun-ichiro itojun Hagino 398686cdd19SJun-ichiro itojun Hagino freeit: 399686cdd19SJun-ichiro itojun Hagino /* 400cd0fdcf7SHajimu UMEMOTO * If we can't tell whether or not we can generate ICMP6, free it. 401686cdd19SJun-ichiro itojun Hagino */ 402686cdd19SJun-ichiro itojun Hagino m_freem(m); 40382cd038dSYoshinobu Inoue } 40482cd038dSYoshinobu Inoue 40582cd038dSYoshinobu Inoue /* 40682cd038dSYoshinobu Inoue * Process a received ICMP6 message. 40782cd038dSYoshinobu Inoue */ 40882cd038dSYoshinobu Inoue int 4091272577eSXin LI icmp6_input(struct mbuf **mp, int *offp, int proto) 41082cd038dSYoshinobu Inoue { 41182cd038dSYoshinobu Inoue struct mbuf *m = *mp, *n; 41229dc7bc6SBruce M Simpson struct ifnet *ifp; 41382cd038dSYoshinobu Inoue struct ip6_hdr *ip6, *nip6; 41482cd038dSYoshinobu Inoue struct icmp6_hdr *icmp6, *nicmp6; 41582cd038dSYoshinobu Inoue int off = *offp; 41682cd038dSYoshinobu Inoue int icmp6len = m->m_pkthdr.len - *offp; 41782cd038dSYoshinobu Inoue int code, sum, noff; 4181d54aa3bSBjoern A. Zeeb char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 4191db8d1f8SAna Kukec int ip6len, error; 42082cd038dSYoshinobu Inoue 42129dc7bc6SBruce M Simpson ifp = m->m_pkthdr.rcvif; 42229dc7bc6SBruce M Simpson 423686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 42482cd038dSYoshinobu Inoue IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE); 42582cd038dSYoshinobu Inoue /* m might change if M_LOOP. So, call mtod after this */ 426686cdd19SJun-ichiro itojun Hagino #endif 42782cd038dSYoshinobu Inoue 42882cd038dSYoshinobu Inoue /* 42982cd038dSYoshinobu Inoue * Locate icmp6 structure in mbuf, and check 43082cd038dSYoshinobu Inoue * that not corrupted and of at least minimum length 43182cd038dSYoshinobu Inoue */ 43282cd038dSYoshinobu Inoue 43382cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 4341db8d1f8SAna Kukec ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen); 43582cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct icmp6_hdr)) { 436e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 43782cd038dSYoshinobu Inoue goto freeit; 43882cd038dSYoshinobu Inoue } 43982cd038dSYoshinobu Inoue 44082cd038dSYoshinobu Inoue /* 44133cde130SBruce M Simpson * Check multicast group membership. 44233cde130SBruce M Simpson * Note: SSM filters are not applied for ICMPv6 traffic. 44333cde130SBruce M Simpson */ 44433cde130SBruce M Simpson if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 44533cde130SBruce M Simpson struct in6_multi *inm; 44633cde130SBruce M Simpson 44733cde130SBruce M Simpson inm = in6m_lookup(ifp, &ip6->ip6_dst); 44833cde130SBruce M Simpson if (inm == NULL) { 44933cde130SBruce M Simpson IP6STAT_INC(ip6s_notmember); 45033cde130SBruce M Simpson in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 45133cde130SBruce M Simpson goto freeit; 45233cde130SBruce M Simpson } 45333cde130SBruce M Simpson } 45433cde130SBruce M Simpson 45533cde130SBruce M Simpson /* 45682cd038dSYoshinobu Inoue * calculate the checksum 45782cd038dSYoshinobu Inoue */ 458686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 45982cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 460686cdd19SJun-ichiro itojun Hagino #else 461686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 462686cdd19SJun-ichiro itojun Hagino if (icmp6 == NULL) { 463e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 464686cdd19SJun-ichiro itojun Hagino return IPPROTO_DONE; 465686cdd19SJun-ichiro itojun Hagino } 466686cdd19SJun-ichiro itojun Hagino #endif 46782cd038dSYoshinobu Inoue code = icmp6->icmp6_code; 46882cd038dSYoshinobu Inoue 46982cd038dSYoshinobu Inoue if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 47033841545SHajimu UMEMOTO nd6log((LOG_ERR, 47182cd038dSYoshinobu Inoue "ICMP6 checksum error(%d|%x) %s\n", 4721d54aa3bSBjoern A. Zeeb icmp6->icmp6_type, sum, 4731d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6bufs, &ip6->ip6_src))); 474e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_checksum); 47582cd038dSYoshinobu Inoue goto freeit; 47682cd038dSYoshinobu Inoue } 47782cd038dSYoshinobu Inoue 478e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_inhist[icmp6->icmp6_type]); 47929dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_msg); 48082cd038dSYoshinobu Inoue if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 48129dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_error); 48282cd038dSYoshinobu Inoue 48382cd038dSYoshinobu Inoue switch (icmp6->icmp6_type) { 48482cd038dSYoshinobu Inoue case ICMP6_DST_UNREACH: 48529dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_dstunreach); 48682cd038dSYoshinobu Inoue switch (code) { 48782cd038dSYoshinobu Inoue case ICMP6_DST_UNREACH_NOROUTE: 488d4c22202SAndrew Gallatin case ICMP6_DST_UNREACH_ADDR: /* PRC_HOSTDEAD is a DOS */ 48982cd038dSYoshinobu Inoue code = PRC_UNREACH_NET; 49082cd038dSYoshinobu Inoue break; 49182cd038dSYoshinobu Inoue case ICMP6_DST_UNREACH_ADMIN: 49229dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_adminprohib); 4933e146575SMichael Tuexen code = PRC_UNREACH_ADMIN_PROHIB; 49482cd038dSYoshinobu Inoue break; 495686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_BEYONDSCOPE: 496686cdd19SJun-ichiro itojun Hagino /* I mean "source address was incorrect." */ 497686cdd19SJun-ichiro itojun Hagino code = PRC_PARAMPROB; 498686cdd19SJun-ichiro itojun Hagino break; 49982cd038dSYoshinobu Inoue case ICMP6_DST_UNREACH_NOPORT: 50082cd038dSYoshinobu Inoue code = PRC_UNREACH_PORT; 50182cd038dSYoshinobu Inoue break; 50282cd038dSYoshinobu Inoue default: 50382cd038dSYoshinobu Inoue goto badcode; 50482cd038dSYoshinobu Inoue } 50582cd038dSYoshinobu Inoue goto deliver; 50682cd038dSYoshinobu Inoue break; 50782cd038dSYoshinobu Inoue 50882cd038dSYoshinobu Inoue case ICMP6_PACKET_TOO_BIG: 50929dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_pkttoobig); 51082cd038dSYoshinobu Inoue 511aaff9927SHajimu UMEMOTO /* validation is made in icmp6_mtudisc_update */ 512aaff9927SHajimu UMEMOTO 51382cd038dSYoshinobu Inoue code = PRC_MSGSIZE; 51482cd038dSYoshinobu Inoue 515686cdd19SJun-ichiro itojun Hagino /* 516686cdd19SJun-ichiro itojun Hagino * Updating the path MTU will be done after examining 517686cdd19SJun-ichiro itojun Hagino * intermediate extension headers. 518686cdd19SJun-ichiro itojun Hagino */ 51982cd038dSYoshinobu Inoue goto deliver; 52082cd038dSYoshinobu Inoue break; 52182cd038dSYoshinobu Inoue 52282cd038dSYoshinobu Inoue case ICMP6_TIME_EXCEEDED: 52329dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_timeexceed); 52482cd038dSYoshinobu Inoue switch (code) { 52582cd038dSYoshinobu Inoue case ICMP6_TIME_EXCEED_TRANSIT: 5262ce62dceSSUZUKI Shinsuke code = PRC_TIMXCEED_INTRANS; 5272ce62dceSSUZUKI Shinsuke break; 52882cd038dSYoshinobu Inoue case ICMP6_TIME_EXCEED_REASSEMBLY: 5292ce62dceSSUZUKI Shinsuke code = PRC_TIMXCEED_REASS; 53082cd038dSYoshinobu Inoue break; 53182cd038dSYoshinobu Inoue default: 53282cd038dSYoshinobu Inoue goto badcode; 53382cd038dSYoshinobu Inoue } 53482cd038dSYoshinobu Inoue goto deliver; 53582cd038dSYoshinobu Inoue break; 53682cd038dSYoshinobu Inoue 53782cd038dSYoshinobu Inoue case ICMP6_PARAM_PROB: 53829dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_paramprob); 53982cd038dSYoshinobu Inoue switch (code) { 54082cd038dSYoshinobu Inoue case ICMP6_PARAMPROB_NEXTHEADER: 54182cd038dSYoshinobu Inoue code = PRC_UNREACH_PROTOCOL; 54282cd038dSYoshinobu Inoue break; 54382cd038dSYoshinobu Inoue case ICMP6_PARAMPROB_HEADER: 54482cd038dSYoshinobu Inoue case ICMP6_PARAMPROB_OPTION: 54582cd038dSYoshinobu Inoue code = PRC_PARAMPROB; 54682cd038dSYoshinobu Inoue break; 54782cd038dSYoshinobu Inoue default: 54882cd038dSYoshinobu Inoue goto badcode; 54982cd038dSYoshinobu Inoue } 55082cd038dSYoshinobu Inoue goto deliver; 55182cd038dSYoshinobu Inoue break; 55282cd038dSYoshinobu Inoue 55382cd038dSYoshinobu Inoue case ICMP6_ECHO_REQUEST: 55429dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_echo); 55582cd038dSYoshinobu Inoue if (code != 0) 55682cd038dSYoshinobu Inoue goto badcode; 557c3bef61eSKevin Lo if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 55882cd038dSYoshinobu Inoue /* Give up remote */ 55982cd038dSYoshinobu Inoue break; 56082cd038dSYoshinobu Inoue } 561f0cace5dSRobert Watson if (!M_WRITABLE(n) 562686cdd19SJun-ichiro itojun Hagino || n->m_len < off + sizeof(struct icmp6_hdr)) { 56382cd038dSYoshinobu Inoue struct mbuf *n0 = n; 5642268ca47SSam Leffler int n0len; 56582cd038dSYoshinobu Inoue 56610e5acc3SGleb Smirnoff CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) <= MHLEN); 5677b07d1beSGleb Smirnoff n = m_gethdr(M_NOWAIT, n0->m_type); 56882cd038dSYoshinobu Inoue if (n == NULL) { 56982cd038dSYoshinobu Inoue /* Give up remote */ 57082cd038dSYoshinobu Inoue m_freem(n0); 57182cd038dSYoshinobu Inoue break; 57282cd038dSYoshinobu Inoue } 57310e5acc3SGleb Smirnoff 57410e5acc3SGleb Smirnoff m_move_pkthdr(n, n0); /* FIB copied. */ 57510e5acc3SGleb Smirnoff n0len = n0->m_pkthdr.len; /* save for use below */ 57682cd038dSYoshinobu Inoue /* 57782cd038dSYoshinobu Inoue * Copy IPv6 and ICMPv6 only. 57882cd038dSYoshinobu Inoue */ 57982cd038dSYoshinobu Inoue nip6 = mtod(n, struct ip6_hdr *); 58082cd038dSYoshinobu Inoue bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 58182cd038dSYoshinobu Inoue nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 58282cd038dSYoshinobu Inoue bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 58382cd038dSYoshinobu Inoue noff = sizeof(struct ip6_hdr); 5842268ca47SSam Leffler /* new mbuf contains only ipv6+icmpv6 headers */ 5852268ca47SSam Leffler n->m_len = noff + sizeof(struct icmp6_hdr); 586686cdd19SJun-ichiro itojun Hagino /* 587686cdd19SJun-ichiro itojun Hagino * Adjust mbuf. ip6_plen will be adjusted in 588686cdd19SJun-ichiro itojun Hagino * ip6_output(). 589686cdd19SJun-ichiro itojun Hagino */ 590686cdd19SJun-ichiro itojun Hagino m_adj(n0, off + sizeof(struct icmp6_hdr)); 5912268ca47SSam Leffler /* recalculate complete packet size */ 5922268ca47SSam Leffler n->m_pkthdr.len = n0len + (noff - off); 593686cdd19SJun-ichiro itojun Hagino n->m_next = n0; 59482cd038dSYoshinobu Inoue } else { 59582cd038dSYoshinobu Inoue nip6 = mtod(n, struct ip6_hdr *); 5966a550ab3SHajimu UMEMOTO IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 5976a550ab3SHajimu UMEMOTO sizeof(*nicmp6)); 59882cd038dSYoshinobu Inoue noff = off; 59982cd038dSYoshinobu Inoue } 60082cd038dSYoshinobu Inoue nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 60182cd038dSYoshinobu Inoue nicmp6->icmp6_code = 0; 60282cd038dSYoshinobu Inoue if (n) { 603e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_reflect); 604e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_outhist[ICMP6_ECHO_REPLY]); 60582cd038dSYoshinobu Inoue icmp6_reflect(n, noff); 60682cd038dSYoshinobu Inoue } 60782cd038dSYoshinobu Inoue break; 60882cd038dSYoshinobu Inoue 60982cd038dSYoshinobu Inoue case ICMP6_ECHO_REPLY: 61029dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_echoreply); 61182cd038dSYoshinobu Inoue if (code != 0) 61282cd038dSYoshinobu Inoue goto badcode; 61382cd038dSYoshinobu Inoue break; 61482cd038dSYoshinobu Inoue 61581170631SHajimu UMEMOTO case MLD_LISTENER_QUERY: 61681170631SHajimu UMEMOTO case MLD_LISTENER_REPORT: 61733cde130SBruce M Simpson case MLD_LISTENER_DONE: 61833cde130SBruce M Simpson case MLDV2_LISTENER_REPORT: 61933cde130SBruce M Simpson /* 62029dc7bc6SBruce M Simpson * Drop MLD traffic which is not link-local, has a hop limit 62129dc7bc6SBruce M Simpson * of greater than 1 hop, or which does not have the 62229dc7bc6SBruce M Simpson * IPv6 HBH Router Alert option. 62329dc7bc6SBruce M Simpson * As IPv6 HBH options are stripped in ip6_input() we must 62429dc7bc6SBruce M Simpson * check an mbuf header flag. 62533cde130SBruce M Simpson * XXX Should we also sanity check that these messages 62633cde130SBruce M Simpson * were directed to a link-local multicast prefix? 62733cde130SBruce M Simpson */ 62829dc7bc6SBruce M Simpson if ((ip6->ip6_hlim != 1) || (m->m_flags & M_RTALERT_MLD) == 0) 629686cdd19SJun-ichiro itojun Hagino goto freeit; 63033cde130SBruce M Simpson if (mld_input(m, off, icmp6len) != 0) 63133cde130SBruce M Simpson return (IPPROTO_DONE); 63282cd038dSYoshinobu Inoue /* m stays. */ 63382cd038dSYoshinobu Inoue break; 63482cd038dSYoshinobu Inoue 63582cd038dSYoshinobu Inoue case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 63682cd038dSYoshinobu Inoue { 63782cd038dSYoshinobu Inoue enum { WRU, FQDN } mode; 63882cd038dSYoshinobu Inoue 639603724d3SBjoern A. Zeeb if (!V_icmp6_nodeinfo) 640686cdd19SJun-ichiro itojun Hagino break; 641686cdd19SJun-ichiro itojun Hagino 64282cd038dSYoshinobu Inoue if (icmp6len == sizeof(struct icmp6_hdr) + 4) 64382cd038dSYoshinobu Inoue mode = WRU; 644686cdd19SJun-ichiro itojun Hagino else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 64582cd038dSYoshinobu Inoue mode = FQDN; 64682cd038dSYoshinobu Inoue else 64782cd038dSYoshinobu Inoue goto badlen; 64882cd038dSYoshinobu Inoue 64982cd038dSYoshinobu Inoue if (mode == FQDN) { 650686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 65182cd038dSYoshinobu Inoue IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), 65282cd038dSYoshinobu Inoue IPPROTO_DONE); 653686cdd19SJun-ichiro itojun Hagino #endif 654c3bef61eSKevin Lo n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 655686cdd19SJun-ichiro itojun Hagino if (n) 656686cdd19SJun-ichiro itojun Hagino n = ni6_input(n, off); 657686cdd19SJun-ichiro itojun Hagino /* XXX meaningless if n == NULL */ 65882cd038dSYoshinobu Inoue noff = sizeof(struct ip6_hdr); 65982cd038dSYoshinobu Inoue } else { 66076ca6f88SJamie Gritton struct prison *pr; 66182cd038dSYoshinobu Inoue u_char *p; 66210e5acc3SGleb Smirnoff int maxhlen, hlen; 66382cd038dSYoshinobu Inoue 66418706985SJINMEI Tatuya /* 66518706985SJINMEI Tatuya * XXX: this combination of flags is pointless, 66618706985SJINMEI Tatuya * but should we keep this for compatibility? 66718706985SJINMEI Tatuya */ 668c81c183dSMark Johnston if ((V_icmp6_nodeinfo & (ICMP6_NODEINFO_FQDNOK | 669c81c183dSMark Johnston ICMP6_NODEINFO_TMPADDROK)) != 670c81c183dSMark Johnston (ICMP6_NODEINFO_FQDNOK | ICMP6_NODEINFO_TMPADDROK)) 67133841545SHajimu UMEMOTO break; 67233841545SHajimu UMEMOTO 673686cdd19SJun-ichiro itojun Hagino if (code != 0) 674686cdd19SJun-ichiro itojun Hagino goto badcode; 67510e5acc3SGleb Smirnoff 67610e5acc3SGleb Smirnoff CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) + 4 <= MHLEN); 67710e5acc3SGleb Smirnoff n = m_gethdr(M_NOWAIT, m->m_type); 67810e5acc3SGleb Smirnoff if (n == NULL) { 679686cdd19SJun-ichiro itojun Hagino /* Give up remote */ 680686cdd19SJun-ichiro itojun Hagino break; 681686cdd19SJun-ichiro itojun Hagino } 68210e5acc3SGleb Smirnoff if (!m_dup_pkthdr(n, m, M_NOWAIT)) { 6839967cafcSSam Leffler /* 6849967cafcSSam Leffler * Previous code did a blind M_COPY_PKTHDR 6859967cafcSSam Leffler * and said "just for rcvif". If true, then 6869967cafcSSam Leffler * we could tolerate the dup failing (due to 6879967cafcSSam Leffler * the deep copy of the tag chain). For now 6889967cafcSSam Leffler * be conservative and just fail. 6899967cafcSSam Leffler */ 6909967cafcSSam Leffler m_free(n); 6919967cafcSSam Leffler n = NULL; 6929967cafcSSam Leffler } 69310e5acc3SGleb Smirnoff maxhlen = M_TRAILINGSPACE(n) - 69410e5acc3SGleb Smirnoff (sizeof(*nip6) + sizeof(*nicmp6) + 4); 69576ca6f88SJamie Gritton pr = curthread->td_ucred->cr_prison; 69676ca6f88SJamie Gritton mtx_lock(&pr->pr_mtx); 697c1f19219SJamie Gritton hlen = strlen(pr->pr_hostname); 69876ca6f88SJamie Gritton if (maxhlen > hlen) 69976ca6f88SJamie Gritton maxhlen = hlen; 70082cd038dSYoshinobu Inoue /* 70182cd038dSYoshinobu Inoue * Copy IPv6 and ICMPv6 only. 70282cd038dSYoshinobu Inoue */ 70382cd038dSYoshinobu Inoue nip6 = mtod(n, struct ip6_hdr *); 70482cd038dSYoshinobu Inoue bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 70582cd038dSYoshinobu Inoue nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 70682cd038dSYoshinobu Inoue bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 70782cd038dSYoshinobu Inoue p = (u_char *)(nicmp6 + 1); 70882cd038dSYoshinobu Inoue bzero(p, 4); 709c1f19219SJamie Gritton /* meaningless TTL */ 710c1f19219SJamie Gritton bcopy(pr->pr_hostname, p + 4, maxhlen); 71176ca6f88SJamie Gritton mtx_unlock(&pr->pr_mtx); 71282cd038dSYoshinobu Inoue noff = sizeof(struct ip6_hdr); 71382cd038dSYoshinobu Inoue n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 714686cdd19SJun-ichiro itojun Hagino sizeof(struct icmp6_hdr) + 4 + maxhlen; 71582cd038dSYoshinobu Inoue nicmp6->icmp6_type = ICMP6_WRUREPLY; 71682cd038dSYoshinobu Inoue nicmp6->icmp6_code = 0; 71782cd038dSYoshinobu Inoue } 71882cd038dSYoshinobu Inoue if (n) { 719e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_reflect); 720e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_outhist[ICMP6_WRUREPLY]); 72182cd038dSYoshinobu Inoue icmp6_reflect(n, noff); 72282cd038dSYoshinobu Inoue } 72382cd038dSYoshinobu Inoue break; 72482cd038dSYoshinobu Inoue } 72582cd038dSYoshinobu Inoue 72682cd038dSYoshinobu Inoue case ICMP6_WRUREPLY: 72782cd038dSYoshinobu Inoue if (code != 0) 72882cd038dSYoshinobu Inoue goto badcode; 72982cd038dSYoshinobu Inoue break; 73082cd038dSYoshinobu Inoue 73182cd038dSYoshinobu Inoue case ND_ROUTER_SOLICIT: 73229dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_routersolicit); 73382cd038dSYoshinobu Inoue if (code != 0) 73482cd038dSYoshinobu Inoue goto badcode; 73582cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_router_solicit)) 73682cd038dSYoshinobu Inoue goto badlen; 7371db8d1f8SAna Kukec if (send_sendso_input_hook != NULL) { 7382d12d25cSMark Johnston IP6_EXTHDR_CHECK(m, off, icmp6len, IPPROTO_DONE); 7392d12d25cSMark Johnston error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); 7402d12d25cSMark Johnston if (error == 0) { 741686cdd19SJun-ichiro itojun Hagino m = NULL; 742686cdd19SJun-ichiro itojun Hagino goto freeit; 743686cdd19SJun-ichiro itojun Hagino } 7442d12d25cSMark Johnston } 7452d12d25cSMark Johnston n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 7462d12d25cSMark Johnston nd6_rs_input(m, off, icmp6len); 7472d12d25cSMark Johnston m = n; 7482d12d25cSMark Johnston if (m == NULL) 749e7a6db74SAna Kukec goto freeit; 75082cd038dSYoshinobu Inoue break; 75182cd038dSYoshinobu Inoue 75282cd038dSYoshinobu Inoue case ND_ROUTER_ADVERT: 75329dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_routeradvert); 75482cd038dSYoshinobu Inoue if (code != 0) 75582cd038dSYoshinobu Inoue goto badcode; 75682cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_router_advert)) 75782cd038dSYoshinobu Inoue goto badlen; 7581db8d1f8SAna Kukec if (send_sendso_input_hook != NULL) { 7592d12d25cSMark Johnston error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); 7602d12d25cSMark Johnston if (error == 0) { 761686cdd19SJun-ichiro itojun Hagino m = NULL; 762686cdd19SJun-ichiro itojun Hagino goto freeit; 763686cdd19SJun-ichiro itojun Hagino } 7642d12d25cSMark Johnston } 7652d12d25cSMark Johnston n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 7662d12d25cSMark Johnston nd6_ra_input(m, off, icmp6len); 7672d12d25cSMark Johnston m = n; 7682d12d25cSMark Johnston if (m == NULL) 769e7a6db74SAna Kukec goto freeit; 77082cd038dSYoshinobu Inoue break; 77182cd038dSYoshinobu Inoue 77282cd038dSYoshinobu Inoue case ND_NEIGHBOR_SOLICIT: 77329dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_neighborsolicit); 77482cd038dSYoshinobu Inoue if (code != 0) 77582cd038dSYoshinobu Inoue goto badcode; 77682cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_neighbor_solicit)) 77782cd038dSYoshinobu Inoue goto badlen; 7781db8d1f8SAna Kukec if (send_sendso_input_hook != NULL) { 7792d12d25cSMark Johnston error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); 7802d12d25cSMark Johnston if (error == 0) { 781686cdd19SJun-ichiro itojun Hagino m = NULL; 782686cdd19SJun-ichiro itojun Hagino goto freeit; 783686cdd19SJun-ichiro itojun Hagino } 7842d12d25cSMark Johnston } 7852d12d25cSMark Johnston n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 7862d12d25cSMark Johnston nd6_ns_input(m, off, icmp6len); 7872d12d25cSMark Johnston m = n; 7882d12d25cSMark Johnston if (m == NULL) 789e7a6db74SAna Kukec goto freeit; 79082cd038dSYoshinobu Inoue break; 79182cd038dSYoshinobu Inoue 79282cd038dSYoshinobu Inoue case ND_NEIGHBOR_ADVERT: 79329dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_neighboradvert); 79482cd038dSYoshinobu Inoue if (code != 0) 79582cd038dSYoshinobu Inoue goto badcode; 79682cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_neighbor_advert)) 79782cd038dSYoshinobu Inoue goto badlen; 7981db8d1f8SAna Kukec if (send_sendso_input_hook != NULL) { 7992d12d25cSMark Johnston error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); 8002d12d25cSMark Johnston if (error == 0) { 801686cdd19SJun-ichiro itojun Hagino m = NULL; 802686cdd19SJun-ichiro itojun Hagino goto freeit; 803686cdd19SJun-ichiro itojun Hagino } 8042d12d25cSMark Johnston } 8052d12d25cSMark Johnston n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 8062d12d25cSMark Johnston nd6_na_input(m, off, icmp6len); 8072d12d25cSMark Johnston m = n; 8082d12d25cSMark Johnston if (m == NULL) 809e7a6db74SAna Kukec goto freeit; 81082cd038dSYoshinobu Inoue break; 81182cd038dSYoshinobu Inoue 81282cd038dSYoshinobu Inoue case ND_REDIRECT: 81329dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_redirect); 81482cd038dSYoshinobu Inoue if (code != 0) 81582cd038dSYoshinobu Inoue goto badcode; 81682cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_redirect)) 81782cd038dSYoshinobu Inoue goto badlen; 8181db8d1f8SAna Kukec if (send_sendso_input_hook != NULL) { 8192d12d25cSMark Johnston error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); 8202d12d25cSMark Johnston if (error == 0) { 821686cdd19SJun-ichiro itojun Hagino m = NULL; 822686cdd19SJun-ichiro itojun Hagino goto freeit; 823686cdd19SJun-ichiro itojun Hagino } 8242d12d25cSMark Johnston } 8252d12d25cSMark Johnston n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 8262d12d25cSMark Johnston icmp6_redirect_input(m, off); 8272d12d25cSMark Johnston m = n; 8282d12d25cSMark Johnston if (m == NULL) 829e7a6db74SAna Kukec goto freeit; 83082cd038dSYoshinobu Inoue break; 83182cd038dSYoshinobu Inoue 83282cd038dSYoshinobu Inoue case ICMP6_ROUTER_RENUMBERING: 83382cd038dSYoshinobu Inoue if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 83482cd038dSYoshinobu Inoue code != ICMP6_ROUTER_RENUMBERING_RESULT) 83582cd038dSYoshinobu Inoue goto badcode; 83682cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct icmp6_router_renum)) 83782cd038dSYoshinobu Inoue goto badlen; 83882cd038dSYoshinobu Inoue break; 83982cd038dSYoshinobu Inoue 84082cd038dSYoshinobu Inoue default: 84133841545SHajimu UMEMOTO nd6log((LOG_DEBUG, 84233841545SHajimu UMEMOTO "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 8431d54aa3bSBjoern A. Zeeb icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src), 8441d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6bufd, &ip6->ip6_dst), 84529dc7bc6SBruce M Simpson ifp ? ifp->if_index : 0)); 84682cd038dSYoshinobu Inoue if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 84782cd038dSYoshinobu Inoue /* ICMPv6 error: MUST deliver it by spec... */ 84882cd038dSYoshinobu Inoue code = PRC_NCMDS; 84982cd038dSYoshinobu Inoue /* deliver */ 85082cd038dSYoshinobu Inoue } else { 85182cd038dSYoshinobu Inoue /* ICMPv6 informational: MUST not deliver */ 85282cd038dSYoshinobu Inoue break; 85382cd038dSYoshinobu Inoue } 85482cd038dSYoshinobu Inoue deliver: 85514c129fcSBjoern A. Zeeb if (icmp6_notify_error(&m, off, icmp6len, code) != 0) { 85633841545SHajimu UMEMOTO /* In this case, m should've been freed. */ 85733841545SHajimu UMEMOTO return (IPPROTO_DONE); 85833841545SHajimu UMEMOTO } 85933841545SHajimu UMEMOTO break; 86033841545SHajimu UMEMOTO 86133841545SHajimu UMEMOTO badcode: 862e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_badcode); 86333841545SHajimu UMEMOTO break; 86433841545SHajimu UMEMOTO 86533841545SHajimu UMEMOTO badlen: 866e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_badlen); 86733841545SHajimu UMEMOTO break; 86833841545SHajimu UMEMOTO } 86933841545SHajimu UMEMOTO 87033841545SHajimu UMEMOTO /* deliver the packet to appropriate sockets */ 87133841545SHajimu UMEMOTO icmp6_rip6_input(&m, *offp); 87233841545SHajimu UMEMOTO 87333841545SHajimu UMEMOTO return IPPROTO_DONE; 87433841545SHajimu UMEMOTO 87533841545SHajimu UMEMOTO freeit: 87633841545SHajimu UMEMOTO m_freem(m); 87733841545SHajimu UMEMOTO return IPPROTO_DONE; 87833841545SHajimu UMEMOTO } 87933841545SHajimu UMEMOTO 88033841545SHajimu UMEMOTO static int 8811272577eSXin LI icmp6_notify_error(struct mbuf **mp, int off, int icmp6len, int code) 88233841545SHajimu UMEMOTO { 8839c0fda72SHajimu UMEMOTO struct mbuf *m = *mp; 88433841545SHajimu UMEMOTO struct icmp6_hdr *icmp6; 88533841545SHajimu UMEMOTO struct ip6_hdr *eip6; 88633841545SHajimu UMEMOTO u_int32_t notifymtu; 88733841545SHajimu UMEMOTO struct sockaddr_in6 icmp6src, icmp6dst; 88833841545SHajimu UMEMOTO 88982cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 890e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 89182cd038dSYoshinobu Inoue goto freeit; 89282cd038dSYoshinobu Inoue } 893686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 89482cd038dSYoshinobu Inoue IP6_EXTHDR_CHECK(m, off, 89506cd0a3fSHajimu UMEMOTO sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1); 89682cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 897686cdd19SJun-ichiro itojun Hagino #else 898686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 899686cdd19SJun-ichiro itojun Hagino sizeof(*icmp6) + sizeof(struct ip6_hdr)); 900686cdd19SJun-ichiro itojun Hagino if (icmp6 == NULL) { 901e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 90233841545SHajimu UMEMOTO return (-1); 903686cdd19SJun-ichiro itojun Hagino } 904686cdd19SJun-ichiro itojun Hagino #endif 90533841545SHajimu UMEMOTO eip6 = (struct ip6_hdr *)(icmp6 + 1); 90682cd038dSYoshinobu Inoue 90782cd038dSYoshinobu Inoue /* Detect the upper level protocol */ 90882cd038dSYoshinobu Inoue { 9099233d8f3SDavid E. O'Brien void (*ctlfunc)(int, struct sockaddr *, void *); 91082cd038dSYoshinobu Inoue u_int8_t nxt = eip6->ip6_nxt; 91182cd038dSYoshinobu Inoue int eoff = off + sizeof(struct icmp6_hdr) + 91282cd038dSYoshinobu Inoue sizeof(struct ip6_hdr); 91382cd038dSYoshinobu Inoue struct ip6ctlparam ip6cp; 914686cdd19SJun-ichiro itojun Hagino struct in6_addr *finaldst = NULL; 915686cdd19SJun-ichiro itojun Hagino int icmp6type = icmp6->icmp6_type; 916686cdd19SJun-ichiro itojun Hagino struct ip6_frag *fh; 917686cdd19SJun-ichiro itojun Hagino struct ip6_rthdr *rth; 918686cdd19SJun-ichiro itojun Hagino struct ip6_rthdr0 *rth0; 919686cdd19SJun-ichiro itojun Hagino int rthlen; 92082cd038dSYoshinobu Inoue 92188ff5695SSUZUKI Shinsuke while (1) { /* XXX: should avoid infinite loop explicitly? */ 92282cd038dSYoshinobu Inoue struct ip6_ext *eh; 92382cd038dSYoshinobu Inoue 92482cd038dSYoshinobu Inoue switch (nxt) { 92582cd038dSYoshinobu Inoue case IPPROTO_HOPOPTS: 92682cd038dSYoshinobu Inoue case IPPROTO_DSTOPTS: 92782cd038dSYoshinobu Inoue case IPPROTO_AH: 928686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 92906cd0a3fSHajimu UMEMOTO IP6_EXTHDR_CHECK(m, 0, 93006cd0a3fSHajimu UMEMOTO eoff + sizeof(struct ip6_ext), -1); 9310527d333SHajimu UMEMOTO eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff); 932686cdd19SJun-ichiro itojun Hagino #else 933686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 934686cdd19SJun-ichiro itojun Hagino eoff, sizeof(*eh)); 935686cdd19SJun-ichiro itojun Hagino if (eh == NULL) { 936e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 93733841545SHajimu UMEMOTO return (-1); 938686cdd19SJun-ichiro itojun Hagino } 939686cdd19SJun-ichiro itojun Hagino #endif 940686cdd19SJun-ichiro itojun Hagino 94182cd038dSYoshinobu Inoue if (nxt == IPPROTO_AH) 94282cd038dSYoshinobu Inoue eoff += (eh->ip6e_len + 2) << 2; 94382cd038dSYoshinobu Inoue else 94482cd038dSYoshinobu Inoue eoff += (eh->ip6e_len + 1) << 3; 94582cd038dSYoshinobu Inoue nxt = eh->ip6e_nxt; 94682cd038dSYoshinobu Inoue break; 947686cdd19SJun-ichiro itojun Hagino case IPPROTO_ROUTING: 948686cdd19SJun-ichiro itojun Hagino /* 949686cdd19SJun-ichiro itojun Hagino * When the erroneous packet contains a 950686cdd19SJun-ichiro itojun Hagino * routing header, we should examine the 951686cdd19SJun-ichiro itojun Hagino * header to determine the final destination. 952686cdd19SJun-ichiro itojun Hagino * Otherwise, we can't properly update 953686cdd19SJun-ichiro itojun Hagino * information that depends on the final 954686cdd19SJun-ichiro itojun Hagino * destination (e.g. path MTU). 955686cdd19SJun-ichiro itojun Hagino */ 956686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 95706cd0a3fSHajimu UMEMOTO IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1); 95806cd0a3fSHajimu UMEMOTO rth = (struct ip6_rthdr *) 95906cd0a3fSHajimu UMEMOTO (mtod(m, caddr_t) + eoff); 960686cdd19SJun-ichiro itojun Hagino #else 961686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 962686cdd19SJun-ichiro itojun Hagino eoff, sizeof(*rth)); 963686cdd19SJun-ichiro itojun Hagino if (rth == NULL) { 964e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 96533841545SHajimu UMEMOTO return (-1); 966686cdd19SJun-ichiro itojun Hagino } 967686cdd19SJun-ichiro itojun Hagino #endif 968686cdd19SJun-ichiro itojun Hagino rthlen = (rth->ip6r_len + 1) << 3; 969686cdd19SJun-ichiro itojun Hagino /* 970686cdd19SJun-ichiro itojun Hagino * XXX: currently there is no 971686cdd19SJun-ichiro itojun Hagino * officially defined type other 972686cdd19SJun-ichiro itojun Hagino * than type-0. 973686cdd19SJun-ichiro itojun Hagino * Note that if the segment left field 974686cdd19SJun-ichiro itojun Hagino * is 0, all intermediate hops must 975686cdd19SJun-ichiro itojun Hagino * have been passed. 976686cdd19SJun-ichiro itojun Hagino */ 977686cdd19SJun-ichiro itojun Hagino if (rth->ip6r_segleft && 978686cdd19SJun-ichiro itojun Hagino rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 979686cdd19SJun-ichiro itojun Hagino int hops; 980686cdd19SJun-ichiro itojun Hagino 981686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 98206cd0a3fSHajimu UMEMOTO IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1); 98306cd0a3fSHajimu UMEMOTO rth0 = (struct ip6_rthdr0 *) 98406cd0a3fSHajimu UMEMOTO (mtod(m, caddr_t) + eoff); 985686cdd19SJun-ichiro itojun Hagino #else 986686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(rth0, 987686cdd19SJun-ichiro itojun Hagino struct ip6_rthdr0 *, m, 988686cdd19SJun-ichiro itojun Hagino eoff, rthlen); 989686cdd19SJun-ichiro itojun Hagino if (rth0 == NULL) { 990e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 99133841545SHajimu UMEMOTO return (-1); 992686cdd19SJun-ichiro itojun Hagino } 993686cdd19SJun-ichiro itojun Hagino #endif 994686cdd19SJun-ichiro itojun Hagino /* just ignore a bogus header */ 995686cdd19SJun-ichiro itojun Hagino if ((rth0->ip6r0_len % 2) == 0 && 996686cdd19SJun-ichiro itojun Hagino (hops = rth0->ip6r0_len/2)) 997686cdd19SJun-ichiro itojun Hagino finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 998686cdd19SJun-ichiro itojun Hagino } 999686cdd19SJun-ichiro itojun Hagino eoff += rthlen; 1000686cdd19SJun-ichiro itojun Hagino nxt = rth->ip6r_nxt; 1001686cdd19SJun-ichiro itojun Hagino break; 1002686cdd19SJun-ichiro itojun Hagino case IPPROTO_FRAGMENT: 1003686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 1004686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_CHECK(m, 0, eoff + 100506cd0a3fSHajimu UMEMOTO sizeof(struct ip6_frag), -1); 100606cd0a3fSHajimu UMEMOTO fh = (struct ip6_frag *)(mtod(m, caddr_t) + 100706cd0a3fSHajimu UMEMOTO eoff); 1008686cdd19SJun-ichiro itojun Hagino #else 1009686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1010686cdd19SJun-ichiro itojun Hagino eoff, sizeof(*fh)); 1011686cdd19SJun-ichiro itojun Hagino if (fh == NULL) { 1012e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 101333841545SHajimu UMEMOTO return (-1); 1014686cdd19SJun-ichiro itojun Hagino } 1015686cdd19SJun-ichiro itojun Hagino #endif 1016686cdd19SJun-ichiro itojun Hagino /* 1017686cdd19SJun-ichiro itojun Hagino * Data after a fragment header is meaningless 1018686cdd19SJun-ichiro itojun Hagino * unless it is the first fragment, but 1019686cdd19SJun-ichiro itojun Hagino * we'll go to the notify label for path MTU 1020686cdd19SJun-ichiro itojun Hagino * discovery. 1021686cdd19SJun-ichiro itojun Hagino */ 1022686cdd19SJun-ichiro itojun Hagino if (fh->ip6f_offlg & IP6F_OFF_MASK) 1023686cdd19SJun-ichiro itojun Hagino goto notify; 1024686cdd19SJun-ichiro itojun Hagino 1025686cdd19SJun-ichiro itojun Hagino eoff += sizeof(struct ip6_frag); 1026686cdd19SJun-ichiro itojun Hagino nxt = fh->ip6f_nxt; 1027686cdd19SJun-ichiro itojun Hagino break; 102882cd038dSYoshinobu Inoue default: 1029686cdd19SJun-ichiro itojun Hagino /* 1030686cdd19SJun-ichiro itojun Hagino * This case includes ESP and the No Next 1031686cdd19SJun-ichiro itojun Hagino * Header. In such cases going to the notify 1032686cdd19SJun-ichiro itojun Hagino * label does not have any meaning 1033686cdd19SJun-ichiro itojun Hagino * (i.e. ctlfunc will be NULL), but we go 1034686cdd19SJun-ichiro itojun Hagino * anyway since we might have to update 1035686cdd19SJun-ichiro itojun Hagino * path MTU information. 1036686cdd19SJun-ichiro itojun Hagino */ 103782cd038dSYoshinobu Inoue goto notify; 103882cd038dSYoshinobu Inoue } 103982cd038dSYoshinobu Inoue } 104082cd038dSYoshinobu Inoue notify: 1041686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 104282cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 1043686cdd19SJun-ichiro itojun Hagino #else 1044686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1045686cdd19SJun-ichiro itojun Hagino sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1046686cdd19SJun-ichiro itojun Hagino if (icmp6 == NULL) { 1047e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 104833841545SHajimu UMEMOTO return (-1); 1049686cdd19SJun-ichiro itojun Hagino } 1050686cdd19SJun-ichiro itojun Hagino #endif 105133841545SHajimu UMEMOTO 105206cd0a3fSHajimu UMEMOTO /* 105306cd0a3fSHajimu UMEMOTO * retrieve parameters from the inner IPv6 header, and convert 105406cd0a3fSHajimu UMEMOTO * them into sockaddr structures. 105506cd0a3fSHajimu UMEMOTO * XXX: there is no guarantee that the source or destination 105606cd0a3fSHajimu UMEMOTO * addresses of the inner packet are in the same scope as 105706cd0a3fSHajimu UMEMOTO * the addresses of the icmp packet. But there is no other 105806cd0a3fSHajimu UMEMOTO * way to determine the zone. 105906cd0a3fSHajimu UMEMOTO */ 106033841545SHajimu UMEMOTO eip6 = (struct ip6_hdr *)(icmp6 + 1); 106106cd0a3fSHajimu UMEMOTO 106233841545SHajimu UMEMOTO bzero(&icmp6dst, sizeof(icmp6dst)); 106333841545SHajimu UMEMOTO icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 106433841545SHajimu UMEMOTO icmp6dst.sin6_family = AF_INET6; 1065686cdd19SJun-ichiro itojun Hagino if (finaldst == NULL) 106633841545SHajimu UMEMOTO icmp6dst.sin6_addr = eip6->ip6_dst; 106733841545SHajimu UMEMOTO else 106833841545SHajimu UMEMOTO icmp6dst.sin6_addr = *finaldst; 1069a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL)) 10709a4f9608SHajimu UMEMOTO goto freeit; 107133841545SHajimu UMEMOTO bzero(&icmp6src, sizeof(icmp6src)); 107233841545SHajimu UMEMOTO icmp6src.sin6_len = sizeof(struct sockaddr_in6); 107333841545SHajimu UMEMOTO icmp6src.sin6_family = AF_INET6; 107433841545SHajimu UMEMOTO icmp6src.sin6_addr = eip6->ip6_src; 1075a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL)) 10769a4f9608SHajimu UMEMOTO goto freeit; 1077a1f7e5f8SHajimu UMEMOTO icmp6src.sin6_flowinfo = 1078a1f7e5f8SHajimu UMEMOTO (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 107933841545SHajimu UMEMOTO 108033841545SHajimu UMEMOTO if (finaldst == NULL) 108133841545SHajimu UMEMOTO finaldst = &eip6->ip6_dst; 108233841545SHajimu UMEMOTO ip6cp.ip6c_m = m; 108333841545SHajimu UMEMOTO ip6cp.ip6c_icmp6 = icmp6; 108433841545SHajimu UMEMOTO ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 108533841545SHajimu UMEMOTO ip6cp.ip6c_off = eoff; 108633841545SHajimu UMEMOTO ip6cp.ip6c_finaldst = finaldst; 108733841545SHajimu UMEMOTO ip6cp.ip6c_src = &icmp6src; 108833841545SHajimu UMEMOTO ip6cp.ip6c_nxt = nxt; 108933841545SHajimu UMEMOTO 109033841545SHajimu UMEMOTO if (icmp6type == ICMP6_PACKET_TOO_BIG) { 109133841545SHajimu UMEMOTO notifymtu = ntohl(icmp6->icmp6_mtu); 109233841545SHajimu UMEMOTO ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 109333841545SHajimu UMEMOTO icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/ 1094686cdd19SJun-ichiro itojun Hagino } 1095686cdd19SJun-ichiro itojun Hagino 10969233d8f3SDavid E. O'Brien ctlfunc = (void (*)(int, struct sockaddr *, void *)) 109782cd038dSYoshinobu Inoue (inet6sw[ip6_protox[nxt]].pr_ctlinput); 109882cd038dSYoshinobu Inoue if (ctlfunc) { 109933841545SHajimu UMEMOTO (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, 110033841545SHajimu UMEMOTO &ip6cp); 110182cd038dSYoshinobu Inoue } 110282cd038dSYoshinobu Inoue } 11039c0fda72SHajimu UMEMOTO *mp = m; 110433841545SHajimu UMEMOTO return (0); 110582cd038dSYoshinobu Inoue 110682cd038dSYoshinobu Inoue freeit: 110782cd038dSYoshinobu Inoue m_freem(m); 110833841545SHajimu UMEMOTO return (-1); 110982cd038dSYoshinobu Inoue } 111082cd038dSYoshinobu Inoue 111133841545SHajimu UMEMOTO void 11121272577eSXin LI icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1113686cdd19SJun-ichiro itojun Hagino { 111433841545SHajimu UMEMOTO struct in6_addr *dst = ip6cp->ip6c_finaldst; 111533841545SHajimu UMEMOTO struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 111633841545SHajimu UMEMOTO struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1117686cdd19SJun-ichiro itojun Hagino u_int mtu = ntohl(icmp6->icmp6_mtu); 111897d8d152SAndre Oppermann struct in_conninfo inc; 1119686cdd19SJun-ichiro itojun Hagino 1120f95d4633SHajimu UMEMOTO #if 0 1121f95d4633SHajimu UMEMOTO /* 1122f95d4633SHajimu UMEMOTO * RFC2460 section 5, last paragraph. 1123f95d4633SHajimu UMEMOTO * even though minimum link MTU for IPv6 is IPV6_MMTU, 1124f95d4633SHajimu UMEMOTO * we may see ICMPv6 too big with mtu < IPV6_MMTU 1125f95d4633SHajimu UMEMOTO * due to packet translator in the middle. 1126f95d4633SHajimu UMEMOTO * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for 1127f95d4633SHajimu UMEMOTO * special handling. 1128f95d4633SHajimu UMEMOTO */ 1129f95d4633SHajimu UMEMOTO if (mtu < IPV6_MMTU) 1130f95d4633SHajimu UMEMOTO return; 1131f95d4633SHajimu UMEMOTO #endif 1132f95d4633SHajimu UMEMOTO 1133f95d4633SHajimu UMEMOTO /* 1134f95d4633SHajimu UMEMOTO * we reject ICMPv6 too big with abnormally small value. 1135f95d4633SHajimu UMEMOTO * XXX what is the good definition of "abnormally small"? 1136f95d4633SHajimu UMEMOTO */ 1137f95d4633SHajimu UMEMOTO if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1138f95d4633SHajimu UMEMOTO return; 1139f95d4633SHajimu UMEMOTO 114033841545SHajimu UMEMOTO if (!validated) 114133841545SHajimu UMEMOTO return; 114233841545SHajimu UMEMOTO 114359ca51adSSimon L. B. Nielsen /* 114459ca51adSSimon L. B. Nielsen * In case the suggested mtu is less than IPV6_MMTU, we 114559ca51adSSimon L. B. Nielsen * only need to remember that it was for above mentioned 114659ca51adSSimon L. B. Nielsen * "alwaysfrag" case. 114759ca51adSSimon L. B. Nielsen * Try to be as close to the spec as possible. 114859ca51adSSimon L. B. Nielsen */ 114959ca51adSSimon L. B. Nielsen if (mtu < IPV6_MMTU) 115059ca51adSSimon L. B. Nielsen mtu = IPV6_MMTU - 8; 115159ca51adSSimon L. B. Nielsen 115297d8d152SAndre Oppermann bzero(&inc, sizeof(inc)); 1153baa09f18SAndrey V. Elsukov inc.inc_fibnum = M_GETFIB(m); 1154dcdb4371SBjoern A. Zeeb inc.inc_flags |= INC_ISIPV6; 115597d8d152SAndre Oppermann inc.inc6_faddr = *dst; 1156a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL)) 1157a1f7e5f8SHajimu UMEMOTO return; 1158686cdd19SJun-ichiro itojun Hagino 1159233dcce1SAndre Oppermann if (mtu < tcp_maxmtu6(&inc, NULL)) { 116097d8d152SAndre Oppermann tcp_hc_updatemtu(&inc, mtu); 1161e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_pmtuchg); 1162686cdd19SJun-ichiro itojun Hagino } 1163686cdd19SJun-ichiro itojun Hagino } 1164686cdd19SJun-ichiro itojun Hagino 116582cd038dSYoshinobu Inoue /* 116633841545SHajimu UMEMOTO * Process a Node Information Query packet, based on 116733841545SHajimu UMEMOTO * draft-ietf-ipngwg-icmp-name-lookups-07. 1168686cdd19SJun-ichiro itojun Hagino * 1169686cdd19SJun-ichiro itojun Hagino * Spec incompatibilities: 1170686cdd19SJun-ichiro itojun Hagino * - IPv6 Subject address handling 1171686cdd19SJun-ichiro itojun Hagino * - IPv4 Subject address handling support missing 1172686cdd19SJun-ichiro itojun Hagino * - Proxy reply (answer even if it's not for me) 1173686cdd19SJun-ichiro itojun Hagino * - joins NI group address at in6_ifattach() time only, does not cope 1174686cdd19SJun-ichiro itojun Hagino * with hostname changes by sethostname(3) 117582cd038dSYoshinobu Inoue */ 117682cd038dSYoshinobu Inoue static struct mbuf * 11771272577eSXin LI ni6_input(struct mbuf *m, int off) 117882cd038dSYoshinobu Inoue { 1179686cdd19SJun-ichiro itojun Hagino struct icmp6_nodeinfo *ni6, *nni6; 118082cd038dSYoshinobu Inoue struct mbuf *n = NULL; 118176ca6f88SJamie Gritton struct prison *pr; 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 pr = curthread->td_ucred->cr_prison; 133476ca6f88SJamie Gritton mtx_lock(&pr->pr_mtx); 1335c1f19219SJamie Gritton n = ni6_nametodns(pr->pr_hostname, 1336c1f19219SJamie Gritton strlen(pr->pr_hostname), 0); 133776ca6f88SJamie Gritton mtx_unlock(&pr->pr_mtx); 1338686cdd19SJun-ichiro itojun Hagino if (!n || n->m_next || n->m_len == 0) 1339686cdd19SJun-ichiro itojun Hagino goto bad; 1340686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(subj, char *, m, 1341686cdd19SJun-ichiro itojun Hagino off + sizeof(struct icmp6_nodeinfo), subjlen); 1342686cdd19SJun-ichiro itojun Hagino if (subj == NULL) 1343686cdd19SJun-ichiro itojun Hagino goto bad; 1344686cdd19SJun-ichiro itojun Hagino if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1345686cdd19SJun-ichiro itojun Hagino n->m_len)) { 1346686cdd19SJun-ichiro itojun Hagino goto bad; 1347686cdd19SJun-ichiro itojun Hagino } 1348686cdd19SJun-ichiro itojun Hagino m_freem(n); 1349686cdd19SJun-ichiro itojun Hagino n = NULL; 1350686cdd19SJun-ichiro itojun Hagino break; 1351686cdd19SJun-ichiro itojun Hagino 135233841545SHajimu UMEMOTO case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1353686cdd19SJun-ichiro itojun Hagino default: 1354686cdd19SJun-ichiro itojun Hagino goto bad; 1355686cdd19SJun-ichiro itojun Hagino } 1356686cdd19SJun-ichiro itojun Hagino break; 1357686cdd19SJun-ichiro itojun Hagino } 1358686cdd19SJun-ichiro itojun Hagino 135933841545SHajimu UMEMOTO /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 136033841545SHajimu UMEMOTO switch (qtype) { 136133841545SHajimu UMEMOTO case NI_QTYPE_FQDN: 1362603724d3SBjoern A. Zeeb if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0) 136333841545SHajimu UMEMOTO goto bad; 136433841545SHajimu UMEMOTO break; 136533841545SHajimu UMEMOTO case NI_QTYPE_NODEADDR: 1366a22adbc6SSUZUKI Shinsuke case NI_QTYPE_IPV4ADDR: 1367603724d3SBjoern A. Zeeb if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0) 136833841545SHajimu UMEMOTO goto bad; 136933841545SHajimu UMEMOTO break; 137033841545SHajimu UMEMOTO } 137133841545SHajimu UMEMOTO 137233841545SHajimu UMEMOTO /* guess reply length */ 137333841545SHajimu UMEMOTO switch (qtype) { 137433841545SHajimu UMEMOTO case NI_QTYPE_NOOP: 137533841545SHajimu UMEMOTO break; /* no reply data */ 137633841545SHajimu UMEMOTO case NI_QTYPE_SUPTYPES: 137733841545SHajimu UMEMOTO replylen += sizeof(u_int32_t); 137833841545SHajimu UMEMOTO break; 137933841545SHajimu UMEMOTO case NI_QTYPE_FQDN: 138033841545SHajimu UMEMOTO /* XXX will append an mbuf */ 138133841545SHajimu UMEMOTO replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 138233841545SHajimu UMEMOTO break; 138333841545SHajimu UMEMOTO case NI_QTYPE_NODEADDR: 1384c66b5feaSHajimu UMEMOTO addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj); 138533841545SHajimu UMEMOTO if ((replylen += addrs * (sizeof(struct in6_addr) + 138633841545SHajimu UMEMOTO sizeof(u_int32_t))) > MCLBYTES) 138733841545SHajimu UMEMOTO replylen = MCLBYTES; /* XXX: will truncate pkt later */ 138833841545SHajimu UMEMOTO break; 1389a22adbc6SSUZUKI Shinsuke case NI_QTYPE_IPV4ADDR: 1390a22adbc6SSUZUKI Shinsuke /* unsupported - should respond with unknown Qtype? */ 1391a22adbc6SSUZUKI Shinsuke break; 139233841545SHajimu UMEMOTO default: 139333841545SHajimu UMEMOTO /* 139433841545SHajimu UMEMOTO * XXX: We must return a reply with the ICMP6 code 139533841545SHajimu UMEMOTO * `unknown Qtype' in this case. However we regard the case 139633841545SHajimu UMEMOTO * as an FQDN query for backward compatibility. 139733841545SHajimu UMEMOTO * Older versions set a random value to this field, 139833841545SHajimu UMEMOTO * so it rarely varies in the defined qtypes. 139933841545SHajimu UMEMOTO * But the mechanism is not reliable... 140033841545SHajimu UMEMOTO * maybe we should obsolete older versions. 140133841545SHajimu UMEMOTO */ 140233841545SHajimu UMEMOTO qtype = NI_QTYPE_FQDN; 140333841545SHajimu UMEMOTO /* XXX will append an mbuf */ 140433841545SHajimu UMEMOTO replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 140533841545SHajimu UMEMOTO oldfqdn++; 140633841545SHajimu UMEMOTO break; 140733841545SHajimu UMEMOTO } 140833841545SHajimu UMEMOTO 140910e5acc3SGleb Smirnoff /* Allocate an mbuf to reply. */ 1410686cdd19SJun-ichiro itojun Hagino if (replylen > MCLBYTES) { 141182cd038dSYoshinobu Inoue /* 141233841545SHajimu UMEMOTO * XXX: should we try to allocate more? But MCLBYTES 141333841545SHajimu UMEMOTO * is probably much larger than IPV6_MMTU... 141482cd038dSYoshinobu Inoue */ 141582cd038dSYoshinobu Inoue goto bad; 1416686cdd19SJun-ichiro itojun Hagino } 141710e5acc3SGleb Smirnoff if (replylen > MHLEN) 141810e5acc3SGleb Smirnoff n = m_getcl(M_NOWAIT, m->m_type, M_PKTHDR); 141910e5acc3SGleb Smirnoff else 142010e5acc3SGleb Smirnoff n = m_gethdr(M_NOWAIT, m->m_type); 142110e5acc3SGleb Smirnoff if (n == NULL) { 142210e5acc3SGleb Smirnoff m_freem(m); 142310e5acc3SGleb Smirnoff return (NULL); 142482cd038dSYoshinobu Inoue } 142510e5acc3SGleb Smirnoff m_move_pkthdr(n, m); /* just for recvif and FIB */ 142682cd038dSYoshinobu Inoue n->m_pkthdr.len = n->m_len = replylen; 142782cd038dSYoshinobu Inoue 142882cd038dSYoshinobu Inoue /* copy mbuf header and IPv6 + Node Information base headers */ 142982cd038dSYoshinobu Inoue bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 143082cd038dSYoshinobu Inoue nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1431686cdd19SJun-ichiro itojun Hagino bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 143282cd038dSYoshinobu Inoue 143382cd038dSYoshinobu Inoue /* qtype dependent procedure */ 143482cd038dSYoshinobu Inoue switch (qtype) { 143582cd038dSYoshinobu Inoue case NI_QTYPE_NOOP: 143633841545SHajimu UMEMOTO nni6->ni_code = ICMP6_NI_SUCCESS; 143782cd038dSYoshinobu Inoue nni6->ni_flags = 0; 143882cd038dSYoshinobu Inoue break; 143982cd038dSYoshinobu Inoue case NI_QTYPE_SUPTYPES: 144033841545SHajimu UMEMOTO { 144133841545SHajimu UMEMOTO u_int32_t v; 144233841545SHajimu UMEMOTO nni6->ni_code = ICMP6_NI_SUCCESS; 144333841545SHajimu UMEMOTO nni6->ni_flags = htons(0x0000); /* raw bitmap */ 144433841545SHajimu UMEMOTO /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 144533841545SHajimu UMEMOTO v = (u_int32_t)htonl(0x0000000f); 144633841545SHajimu UMEMOTO bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 144782cd038dSYoshinobu Inoue break; 144833841545SHajimu UMEMOTO } 144982cd038dSYoshinobu Inoue case NI_QTYPE_FQDN: 145033841545SHajimu UMEMOTO nni6->ni_code = ICMP6_NI_SUCCESS; 145182cd038dSYoshinobu Inoue fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 145206cd0a3fSHajimu UMEMOTO sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo)); 145382cd038dSYoshinobu Inoue nni6->ni_flags = 0; /* XXX: meaningless TTL */ 145482cd038dSYoshinobu Inoue fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1455686cdd19SJun-ichiro itojun Hagino /* 145676ca6f88SJamie Gritton * XXX do we really have FQDN in hostname? 1457686cdd19SJun-ichiro itojun Hagino */ 145876ca6f88SJamie Gritton pr = curthread->td_ucred->cr_prison; 145976ca6f88SJamie Gritton mtx_lock(&pr->pr_mtx); 1460c1f19219SJamie Gritton n->m_next = ni6_nametodns(pr->pr_hostname, 1461c1f19219SJamie Gritton strlen(pr->pr_hostname), oldfqdn); 146276ca6f88SJamie Gritton mtx_unlock(&pr->pr_mtx); 1463686cdd19SJun-ichiro itojun Hagino if (n->m_next == NULL) 1464686cdd19SJun-ichiro itojun Hagino goto bad; 1465686cdd19SJun-ichiro itojun Hagino /* XXX we assume that n->m_next is not a chain */ 1466686cdd19SJun-ichiro itojun Hagino if (n->m_next->m_next != NULL) 1467686cdd19SJun-ichiro itojun Hagino goto bad; 1468686cdd19SJun-ichiro itojun Hagino n->m_pkthdr.len += n->m_next->m_len; 146982cd038dSYoshinobu Inoue break; 147082cd038dSYoshinobu Inoue case NI_QTYPE_NODEADDR: 147182cd038dSYoshinobu Inoue { 147282cd038dSYoshinobu Inoue int lenlim, copied; 147382cd038dSYoshinobu Inoue 147433841545SHajimu UMEMOTO nni6->ni_code = ICMP6_NI_SUCCESS; 147533841545SHajimu UMEMOTO n->m_pkthdr.len = n->m_len = 147633841545SHajimu UMEMOTO sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 147733841545SHajimu UMEMOTO lenlim = M_TRAILINGSPACE(n); 147882cd038dSYoshinobu Inoue copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 147982cd038dSYoshinobu Inoue /* XXX: reset mbuf length */ 148082cd038dSYoshinobu Inoue n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 148182cd038dSYoshinobu Inoue sizeof(struct icmp6_nodeinfo) + copied; 148282cd038dSYoshinobu Inoue break; 148382cd038dSYoshinobu Inoue } 148482cd038dSYoshinobu Inoue default: 148582cd038dSYoshinobu Inoue break; /* XXX impossible! */ 148682cd038dSYoshinobu Inoue } 148782cd038dSYoshinobu Inoue 148882cd038dSYoshinobu Inoue nni6->ni_type = ICMP6_NI_REPLY; 1489686cdd19SJun-ichiro itojun Hagino m_freem(m); 149082cd038dSYoshinobu Inoue return (n); 149182cd038dSYoshinobu Inoue 149282cd038dSYoshinobu Inoue bad: 1493686cdd19SJun-ichiro itojun Hagino m_freem(m); 149482cd038dSYoshinobu Inoue if (n) 149582cd038dSYoshinobu Inoue m_freem(n); 149682cd038dSYoshinobu Inoue return (NULL); 149782cd038dSYoshinobu Inoue } 149882cd038dSYoshinobu Inoue 149982cd038dSYoshinobu Inoue /* 1500686cdd19SJun-ichiro itojun Hagino * make a mbuf with DNS-encoded string. no compression support. 1501686cdd19SJun-ichiro itojun Hagino * 1502686cdd19SJun-ichiro itojun Hagino * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1503686cdd19SJun-ichiro itojun Hagino * treated as truncated name (two \0 at the end). this is a wild guess. 15041272577eSXin LI * 15051272577eSXin LI * old - return pascal string if non-zero 1506686cdd19SJun-ichiro itojun Hagino */ 1507686cdd19SJun-ichiro itojun Hagino static struct mbuf * 15081272577eSXin LI ni6_nametodns(const char *name, int namelen, int old) 1509686cdd19SJun-ichiro itojun Hagino { 1510686cdd19SJun-ichiro itojun Hagino struct mbuf *m; 1511686cdd19SJun-ichiro itojun Hagino char *cp, *ep; 1512686cdd19SJun-ichiro itojun Hagino const char *p, *q; 1513686cdd19SJun-ichiro itojun Hagino int i, len, nterm; 1514686cdd19SJun-ichiro itojun Hagino 1515686cdd19SJun-ichiro itojun Hagino if (old) 1516686cdd19SJun-ichiro itojun Hagino len = namelen + 1; 1517686cdd19SJun-ichiro itojun Hagino else 1518686cdd19SJun-ichiro itojun Hagino len = MCLBYTES; 1519686cdd19SJun-ichiro itojun Hagino 15207b07d1beSGleb Smirnoff /* Because MAXHOSTNAMELEN is usually 256, we use cluster mbuf. */ 15217b07d1beSGleb Smirnoff if (len > MLEN) 15227b07d1beSGleb Smirnoff m = m_getcl(M_NOWAIT, MT_DATA, 0); 15237b07d1beSGleb Smirnoff else 15247b07d1beSGleb Smirnoff m = m_get(M_NOWAIT, MT_DATA); 15257b07d1beSGleb Smirnoff if (m == NULL) 1526686cdd19SJun-ichiro itojun Hagino goto fail; 1527686cdd19SJun-ichiro itojun Hagino 1528686cdd19SJun-ichiro itojun Hagino if (old) { 1529686cdd19SJun-ichiro itojun Hagino m->m_len = len; 1530686cdd19SJun-ichiro itojun Hagino *mtod(m, char *) = namelen; 1531686cdd19SJun-ichiro itojun Hagino bcopy(name, mtod(m, char *) + 1, namelen); 1532686cdd19SJun-ichiro itojun Hagino return m; 1533686cdd19SJun-ichiro itojun Hagino } else { 1534686cdd19SJun-ichiro itojun Hagino m->m_len = 0; 1535686cdd19SJun-ichiro itojun Hagino cp = mtod(m, char *); 1536686cdd19SJun-ichiro itojun Hagino ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1537686cdd19SJun-ichiro itojun Hagino 1538686cdd19SJun-ichiro itojun Hagino /* if not certain about my name, return empty buffer */ 1539686cdd19SJun-ichiro itojun Hagino if (namelen == 0) 1540686cdd19SJun-ichiro itojun Hagino return m; 1541686cdd19SJun-ichiro itojun Hagino 1542686cdd19SJun-ichiro itojun Hagino /* 1543686cdd19SJun-ichiro itojun Hagino * guess if it looks like shortened hostname, or FQDN. 1544686cdd19SJun-ichiro itojun Hagino * shortened hostname needs two trailing "\0". 1545686cdd19SJun-ichiro itojun Hagino */ 1546686cdd19SJun-ichiro itojun Hagino i = 0; 1547686cdd19SJun-ichiro itojun Hagino for (p = name; p < name + namelen; p++) { 1548686cdd19SJun-ichiro itojun Hagino if (*p && *p == '.') 1549686cdd19SJun-ichiro itojun Hagino i++; 1550686cdd19SJun-ichiro itojun Hagino } 1551686cdd19SJun-ichiro itojun Hagino if (i < 2) 1552686cdd19SJun-ichiro itojun Hagino nterm = 2; 1553686cdd19SJun-ichiro itojun Hagino else 1554686cdd19SJun-ichiro itojun Hagino nterm = 1; 1555686cdd19SJun-ichiro itojun Hagino 1556686cdd19SJun-ichiro itojun Hagino p = name; 1557686cdd19SJun-ichiro itojun Hagino while (cp < ep && p < name + namelen) { 1558686cdd19SJun-ichiro itojun Hagino i = 0; 1559686cdd19SJun-ichiro itojun Hagino for (q = p; q < name + namelen && *q && *q != '.'; q++) 1560686cdd19SJun-ichiro itojun Hagino i++; 1561686cdd19SJun-ichiro itojun Hagino /* result does not fit into mbuf */ 1562686cdd19SJun-ichiro itojun Hagino if (cp + i + 1 >= ep) 1563686cdd19SJun-ichiro itojun Hagino goto fail; 1564610be6ceSHajimu UMEMOTO /* 1565610be6ceSHajimu UMEMOTO * DNS label length restriction, RFC1035 page 8. 1566610be6ceSHajimu UMEMOTO * "i == 0" case is included here to avoid returning 1567610be6ceSHajimu UMEMOTO * 0-length label on "foo..bar". 1568610be6ceSHajimu UMEMOTO */ 1569610be6ceSHajimu UMEMOTO if (i <= 0 || i >= 64) 1570686cdd19SJun-ichiro itojun Hagino goto fail; 1571686cdd19SJun-ichiro itojun Hagino *cp++ = i; 1572686cdd19SJun-ichiro itojun Hagino bcopy(p, cp, i); 1573686cdd19SJun-ichiro itojun Hagino cp += i; 1574686cdd19SJun-ichiro itojun Hagino p = q; 1575686cdd19SJun-ichiro itojun Hagino if (p < name + namelen && *p == '.') 1576686cdd19SJun-ichiro itojun Hagino p++; 1577686cdd19SJun-ichiro itojun Hagino } 1578686cdd19SJun-ichiro itojun Hagino /* termination */ 1579686cdd19SJun-ichiro itojun Hagino if (cp + nterm >= ep) 1580686cdd19SJun-ichiro itojun Hagino goto fail; 1581686cdd19SJun-ichiro itojun Hagino while (nterm-- > 0) 1582686cdd19SJun-ichiro itojun Hagino *cp++ = '\0'; 1583686cdd19SJun-ichiro itojun Hagino m->m_len = cp - mtod(m, char *); 1584686cdd19SJun-ichiro itojun Hagino return m; 1585686cdd19SJun-ichiro itojun Hagino } 1586686cdd19SJun-ichiro itojun Hagino 1587686cdd19SJun-ichiro itojun Hagino panic("should not reach here"); 1588686cdd19SJun-ichiro itojun Hagino /* NOTREACHED */ 1589686cdd19SJun-ichiro itojun Hagino 1590686cdd19SJun-ichiro itojun Hagino fail: 1591686cdd19SJun-ichiro itojun Hagino if (m) 1592686cdd19SJun-ichiro itojun Hagino m_freem(m); 1593686cdd19SJun-ichiro itojun Hagino return NULL; 1594686cdd19SJun-ichiro itojun Hagino } 1595686cdd19SJun-ichiro itojun Hagino 1596686cdd19SJun-ichiro itojun Hagino /* 1597686cdd19SJun-ichiro itojun Hagino * check if two DNS-encoded string matches. takes care of truncated 1598686cdd19SJun-ichiro itojun Hagino * form (with \0\0 at the end). no compression support. 159933841545SHajimu UMEMOTO * XXX upper/lowercase match (see RFC2065) 1600686cdd19SJun-ichiro itojun Hagino */ 1601686cdd19SJun-ichiro itojun Hagino static int 16021272577eSXin LI ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1603686cdd19SJun-ichiro itojun Hagino { 1604686cdd19SJun-ichiro itojun Hagino const char *a0, *b0; 1605686cdd19SJun-ichiro itojun Hagino int l; 1606686cdd19SJun-ichiro itojun Hagino 1607686cdd19SJun-ichiro itojun Hagino /* simplest case - need validation? */ 1608686cdd19SJun-ichiro itojun Hagino if (alen == blen && bcmp(a, b, alen) == 0) 1609686cdd19SJun-ichiro itojun Hagino return 1; 1610686cdd19SJun-ichiro itojun Hagino 1611686cdd19SJun-ichiro itojun Hagino a0 = a; 1612686cdd19SJun-ichiro itojun Hagino b0 = b; 1613686cdd19SJun-ichiro itojun Hagino 1614686cdd19SJun-ichiro itojun Hagino /* termination is mandatory */ 1615686cdd19SJun-ichiro itojun Hagino if (alen < 2 || blen < 2) 1616686cdd19SJun-ichiro itojun Hagino return 0; 1617686cdd19SJun-ichiro itojun Hagino if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1618686cdd19SJun-ichiro itojun Hagino return 0; 1619686cdd19SJun-ichiro itojun Hagino alen--; 1620686cdd19SJun-ichiro itojun Hagino blen--; 1621686cdd19SJun-ichiro itojun Hagino 1622686cdd19SJun-ichiro itojun Hagino while (a - a0 < alen && b - b0 < blen) { 1623686cdd19SJun-ichiro itojun Hagino if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1624686cdd19SJun-ichiro itojun Hagino return 0; 1625686cdd19SJun-ichiro itojun Hagino 1626686cdd19SJun-ichiro itojun Hagino if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1627686cdd19SJun-ichiro itojun Hagino return 0; 1628686cdd19SJun-ichiro itojun Hagino /* we don't support compression yet */ 1629686cdd19SJun-ichiro itojun Hagino if (a[0] >= 64 || b[0] >= 64) 1630686cdd19SJun-ichiro itojun Hagino return 0; 1631686cdd19SJun-ichiro itojun Hagino 1632686cdd19SJun-ichiro itojun Hagino /* truncated case */ 1633686cdd19SJun-ichiro itojun Hagino if (a[0] == 0 && a - a0 == alen - 1) 1634686cdd19SJun-ichiro itojun Hagino return 1; 1635686cdd19SJun-ichiro itojun Hagino if (b[0] == 0 && b - b0 == blen - 1) 1636686cdd19SJun-ichiro itojun Hagino return 1; 1637686cdd19SJun-ichiro itojun Hagino if (a[0] == 0 || b[0] == 0) 1638686cdd19SJun-ichiro itojun Hagino return 0; 1639686cdd19SJun-ichiro itojun Hagino 1640686cdd19SJun-ichiro itojun Hagino if (a[0] != b[0]) 1641686cdd19SJun-ichiro itojun Hagino return 0; 1642686cdd19SJun-ichiro itojun Hagino l = a[0]; 1643686cdd19SJun-ichiro itojun Hagino if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1644686cdd19SJun-ichiro itojun Hagino return 0; 1645686cdd19SJun-ichiro itojun Hagino if (bcmp(a + 1, b + 1, l) != 0) 1646686cdd19SJun-ichiro itojun Hagino return 0; 1647686cdd19SJun-ichiro itojun Hagino 1648686cdd19SJun-ichiro itojun Hagino a += 1 + l; 1649686cdd19SJun-ichiro itojun Hagino b += 1 + l; 1650686cdd19SJun-ichiro itojun Hagino } 1651686cdd19SJun-ichiro itojun Hagino 1652686cdd19SJun-ichiro itojun Hagino if (a - a0 == alen && b - b0 == blen) 1653686cdd19SJun-ichiro itojun Hagino return 1; 1654686cdd19SJun-ichiro itojun Hagino else 1655686cdd19SJun-ichiro itojun Hagino return 0; 1656686cdd19SJun-ichiro itojun Hagino } 1657686cdd19SJun-ichiro itojun Hagino 1658686cdd19SJun-ichiro itojun Hagino /* 165982cd038dSYoshinobu Inoue * calculate the number of addresses to be returned in the node info reply. 166082cd038dSYoshinobu Inoue */ 166182cd038dSYoshinobu Inoue static int 16621272577eSXin LI ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp, 16631272577eSXin LI struct in6_addr *subj) 166482cd038dSYoshinobu Inoue { 166533841545SHajimu UMEMOTO struct ifnet *ifp; 166633841545SHajimu UMEMOTO struct in6_ifaddr *ifa6; 166733841545SHajimu UMEMOTO struct ifaddr *ifa; 166882cd038dSYoshinobu Inoue int addrs = 0, addrsofif, iffound = 0; 166933841545SHajimu UMEMOTO int niflags = ni6->ni_flags; 167033841545SHajimu UMEMOTO 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 168677dfcdc4SRobert Watson IFNET_RLOCK_NOSLEEP(); 1687e6abaf91SGleb Smirnoff TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 168882cd038dSYoshinobu Inoue addrsofif = 0; 1689137f91e8SJohn Baldwin IF_ADDR_RLOCK(ifp); 1690c4dd3fe1SRobert Watson TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 169182cd038dSYoshinobu Inoue if (ifa->ifa_addr->sa_family != AF_INET6) 169282cd038dSYoshinobu Inoue continue; 169382cd038dSYoshinobu Inoue ifa6 = (struct in6_ifaddr *)ifa; 169482cd038dSYoshinobu Inoue 169533841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1696c66b5feaSHajimu UMEMOTO IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr)) 169782cd038dSYoshinobu Inoue iffound = 1; 169882cd038dSYoshinobu Inoue 1699686cdd19SJun-ichiro itojun Hagino /* 1700686cdd19SJun-ichiro itojun Hagino * IPv4-mapped addresses can only be returned by a 1701686cdd19SJun-ichiro itojun Hagino * Node Information proxy, since they represent 1702686cdd19SJun-ichiro itojun Hagino * addresses of IPv4-only nodes, which perforce do 1703686cdd19SJun-ichiro itojun Hagino * not implement this protocol. 170433841545SHajimu UMEMOTO * [icmp-name-lookups-07, Section 5.4] 1705686cdd19SJun-ichiro itojun Hagino * So we don't support NI_NODEADDR_FLAG_COMPAT in 1706686cdd19SJun-ichiro itojun Hagino * this function at this moment. 1707686cdd19SJun-ichiro itojun Hagino */ 1708686cdd19SJun-ichiro itojun Hagino 170982cd038dSYoshinobu Inoue /* What do we have to do about ::1? */ 171082cd038dSYoshinobu Inoue switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 171182cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_LINKLOCAL: 171233841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 171333841545SHajimu UMEMOTO continue; 171482cd038dSYoshinobu Inoue break; 171582cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_SITELOCAL: 171633841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 171733841545SHajimu UMEMOTO continue; 171882cd038dSYoshinobu Inoue break; 171982cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_GLOBAL: 172033841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 172133841545SHajimu UMEMOTO continue; 172282cd038dSYoshinobu Inoue break; 172382cd038dSYoshinobu Inoue default: 172482cd038dSYoshinobu Inoue continue; 172582cd038dSYoshinobu Inoue } 172633841545SHajimu UMEMOTO 172733841545SHajimu UMEMOTO /* 172833841545SHajimu UMEMOTO * check if anycast is okay. 172933841545SHajimu UMEMOTO * XXX: just experimental. not in the spec. 173033841545SHajimu UMEMOTO */ 173133841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 173233841545SHajimu UMEMOTO (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 173333841545SHajimu UMEMOTO continue; /* we need only unicast addresses */ 173433841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1735603724d3SBjoern A. Zeeb (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) { 173633841545SHajimu UMEMOTO continue; 173733841545SHajimu UMEMOTO } 173833841545SHajimu UMEMOTO addrsofif++; /* count the address */ 173982cd038dSYoshinobu Inoue } 1740137f91e8SJohn Baldwin IF_ADDR_RUNLOCK(ifp); 174182cd038dSYoshinobu Inoue if (iffound) { 174282cd038dSYoshinobu Inoue *ifpp = ifp; 174377dfcdc4SRobert Watson IFNET_RUNLOCK_NOSLEEP(); 174482cd038dSYoshinobu Inoue return (addrsofif); 174582cd038dSYoshinobu Inoue } 174682cd038dSYoshinobu Inoue 174782cd038dSYoshinobu Inoue addrs += addrsofif; 174882cd038dSYoshinobu Inoue } 174977dfcdc4SRobert Watson IFNET_RUNLOCK_NOSLEEP(); 175082cd038dSYoshinobu Inoue 175182cd038dSYoshinobu Inoue return (addrs); 175282cd038dSYoshinobu Inoue } 175382cd038dSYoshinobu Inoue 175482cd038dSYoshinobu Inoue static int 17551272577eSXin LI ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6, 17561272577eSXin LI struct ifnet *ifp0, int resid) 175782cd038dSYoshinobu Inoue { 175894e83133SJohn Baldwin struct ifnet *ifp; 175933841545SHajimu UMEMOTO struct in6_ifaddr *ifa6; 176033841545SHajimu UMEMOTO struct ifaddr *ifa; 176133841545SHajimu UMEMOTO struct ifnet *ifp_dep = NULL; 176233841545SHajimu UMEMOTO int copied = 0, allow_deprecated = 0; 176382cd038dSYoshinobu Inoue u_char *cp = (u_char *)(nni6 + 1); 176433841545SHajimu UMEMOTO int niflags = ni6->ni_flags; 176533841545SHajimu UMEMOTO u_int32_t ltime; 176682cd038dSYoshinobu Inoue 176733841545SHajimu UMEMOTO if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 176882cd038dSYoshinobu Inoue return (0); /* needless to copy */ 176982cd038dSYoshinobu Inoue 177077dfcdc4SRobert Watson IFNET_RLOCK_NOSLEEP(); 177194e83133SJohn Baldwin ifp = ifp0 ? ifp0 : TAILQ_FIRST(&V_ifnet); 177233841545SHajimu UMEMOTO again: 17730527d333SHajimu UMEMOTO 1774e6abaf91SGleb Smirnoff for (; ifp; ifp = TAILQ_NEXT(ifp, if_link)) { 1775137f91e8SJohn Baldwin IF_ADDR_RLOCK(ifp); 1776c4dd3fe1SRobert Watson TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 177782cd038dSYoshinobu Inoue if (ifa->ifa_addr->sa_family != AF_INET6) 177882cd038dSYoshinobu Inoue continue; 177982cd038dSYoshinobu Inoue ifa6 = (struct in6_ifaddr *)ifa; 178082cd038dSYoshinobu Inoue 178133841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 178233841545SHajimu UMEMOTO allow_deprecated == 0) { 178333841545SHajimu UMEMOTO /* 178433841545SHajimu UMEMOTO * prefererred address should be put before 178533841545SHajimu UMEMOTO * deprecated addresses. 178633841545SHajimu UMEMOTO */ 178733841545SHajimu UMEMOTO 178833841545SHajimu UMEMOTO /* record the interface for later search */ 178933841545SHajimu UMEMOTO if (ifp_dep == NULL) 179033841545SHajimu UMEMOTO ifp_dep = ifp; 179133841545SHajimu UMEMOTO 179282cd038dSYoshinobu Inoue continue; 179306cd0a3fSHajimu UMEMOTO } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 179433841545SHajimu UMEMOTO allow_deprecated != 0) 179533841545SHajimu UMEMOTO continue; /* we now collect deprecated addrs */ 179682cd038dSYoshinobu Inoue 179782cd038dSYoshinobu Inoue /* What do we have to do about ::1? */ 179882cd038dSYoshinobu Inoue switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 179982cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_LINKLOCAL: 180033841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 180133841545SHajimu UMEMOTO continue; 180282cd038dSYoshinobu Inoue break; 180382cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_SITELOCAL: 180433841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 180533841545SHajimu UMEMOTO continue; 180682cd038dSYoshinobu Inoue break; 180782cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_GLOBAL: 180833841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 180933841545SHajimu UMEMOTO continue; 181082cd038dSYoshinobu Inoue break; 181182cd038dSYoshinobu Inoue default: 181282cd038dSYoshinobu Inoue continue; 181382cd038dSYoshinobu Inoue } 181482cd038dSYoshinobu Inoue 181533841545SHajimu UMEMOTO /* 181633841545SHajimu UMEMOTO * check if anycast is okay. 181733841545SHajimu UMEMOTO * XXX: just experimental. not in the spec. 181833841545SHajimu UMEMOTO */ 181933841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 182033841545SHajimu UMEMOTO (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 182133841545SHajimu UMEMOTO continue; 182233841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1823603724d3SBjoern A. Zeeb (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) { 182433841545SHajimu UMEMOTO continue; 182533841545SHajimu UMEMOTO } 182633841545SHajimu UMEMOTO 182733841545SHajimu UMEMOTO /* now we can copy the address */ 182833841545SHajimu UMEMOTO if (resid < sizeof(struct in6_addr) + 182933841545SHajimu UMEMOTO sizeof(u_int32_t)) { 1830137f91e8SJohn Baldwin IF_ADDR_RUNLOCK(ifp); 183182cd038dSYoshinobu Inoue /* 183282cd038dSYoshinobu Inoue * We give up much more copy. 183382cd038dSYoshinobu Inoue * Set the truncate flag and return. 183482cd038dSYoshinobu Inoue */ 183506cd0a3fSHajimu UMEMOTO nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 183677dfcdc4SRobert Watson IFNET_RUNLOCK_NOSLEEP(); 183782cd038dSYoshinobu Inoue return (copied); 183882cd038dSYoshinobu Inoue } 183933841545SHajimu UMEMOTO 184033841545SHajimu UMEMOTO /* 184133841545SHajimu UMEMOTO * Set the TTL of the address. 184233841545SHajimu UMEMOTO * The TTL value should be one of the following 184333841545SHajimu UMEMOTO * according to the specification: 184433841545SHajimu UMEMOTO * 184533841545SHajimu UMEMOTO * 1. The remaining lifetime of a DHCP lease on the 184633841545SHajimu UMEMOTO * address, or 184733841545SHajimu UMEMOTO * 2. The remaining Valid Lifetime of a prefix from 184833841545SHajimu UMEMOTO * which the address was derived through Stateless 184933841545SHajimu UMEMOTO * Autoconfiguration. 185033841545SHajimu UMEMOTO * 185133841545SHajimu UMEMOTO * Note that we currently do not support stateful 185233841545SHajimu UMEMOTO * address configuration by DHCPv6, so the former 185333841545SHajimu UMEMOTO * case can't happen. 185433841545SHajimu UMEMOTO */ 185533841545SHajimu UMEMOTO if (ifa6->ia6_lifetime.ia6t_expire == 0) 185633841545SHajimu UMEMOTO ltime = ND6_INFINITE_LIFETIME; 185733841545SHajimu UMEMOTO else { 185833841545SHajimu UMEMOTO if (ifa6->ia6_lifetime.ia6t_expire > 18597d26db17SHiroki Sato time_uptime) 18607d26db17SHiroki Sato ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime); 186133841545SHajimu UMEMOTO else 186233841545SHajimu UMEMOTO ltime = 0; 186333841545SHajimu UMEMOTO } 186433841545SHajimu UMEMOTO 186533841545SHajimu UMEMOTO bcopy(<ime, cp, sizeof(u_int32_t)); 186633841545SHajimu UMEMOTO cp += sizeof(u_int32_t); 186733841545SHajimu UMEMOTO 186833841545SHajimu UMEMOTO /* copy the address itself */ 186982cd038dSYoshinobu Inoue bcopy(&ifa6->ia_addr.sin6_addr, cp, 187082cd038dSYoshinobu Inoue sizeof(struct in6_addr)); 18719a4f9608SHajimu UMEMOTO in6_clearscope((struct in6_addr *)cp); /* XXX */ 187282cd038dSYoshinobu Inoue cp += sizeof(struct in6_addr); 187333841545SHajimu UMEMOTO 187433841545SHajimu UMEMOTO resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 187506cd0a3fSHajimu UMEMOTO copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 187682cd038dSYoshinobu Inoue } 1877137f91e8SJohn Baldwin IF_ADDR_RUNLOCK(ifp); 187882cd038dSYoshinobu Inoue if (ifp0) /* we need search only on the specified IF */ 187982cd038dSYoshinobu Inoue break; 188082cd038dSYoshinobu Inoue } 188182cd038dSYoshinobu Inoue 188233841545SHajimu UMEMOTO if (allow_deprecated == 0 && ifp_dep != NULL) { 188333841545SHajimu UMEMOTO ifp = ifp_dep; 188433841545SHajimu UMEMOTO allow_deprecated = 1; 188533841545SHajimu UMEMOTO 188633841545SHajimu UMEMOTO goto again; 188733841545SHajimu UMEMOTO } 188833841545SHajimu UMEMOTO 188977dfcdc4SRobert Watson IFNET_RUNLOCK_NOSLEEP(); 1890b30a244cSJeffrey Hsu 189182cd038dSYoshinobu Inoue return (copied); 189282cd038dSYoshinobu Inoue } 189382cd038dSYoshinobu Inoue 189482cd038dSYoshinobu Inoue /* 189582cd038dSYoshinobu Inoue * XXX almost dup'ed code with rip6_input. 189682cd038dSYoshinobu Inoue */ 189782cd038dSYoshinobu Inoue static int 18981272577eSXin LI icmp6_rip6_input(struct mbuf **mp, int off) 189982cd038dSYoshinobu Inoue { 190082cd038dSYoshinobu Inoue struct mbuf *m = *mp; 190133841545SHajimu UMEMOTO struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1902fc384fa5SBjoern A. Zeeb struct inpcb *in6p; 1903fc384fa5SBjoern A. Zeeb struct inpcb *last = NULL; 19049a4f9608SHajimu UMEMOTO struct sockaddr_in6 fromsa; 190582cd038dSYoshinobu Inoue struct icmp6_hdr *icmp6; 190682cd038dSYoshinobu Inoue struct mbuf *opts = NULL; 190782cd038dSYoshinobu Inoue 1908686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 190982cd038dSYoshinobu Inoue /* this is assumed to be safe. */ 191082cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 1911686cdd19SJun-ichiro itojun Hagino #else 1912686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1913686cdd19SJun-ichiro itojun Hagino if (icmp6 == NULL) { 1914686cdd19SJun-ichiro itojun Hagino /* m is already reclaimed */ 191506cd0a3fSHajimu UMEMOTO return (IPPROTO_DONE); 1916686cdd19SJun-ichiro itojun Hagino } 1917686cdd19SJun-ichiro itojun Hagino #endif 191882cd038dSYoshinobu Inoue 1919a1f7e5f8SHajimu UMEMOTO /* 1920a1f7e5f8SHajimu UMEMOTO * XXX: the address may have embedded scope zone ID, which should be 1921a1f7e5f8SHajimu UMEMOTO * hidden from applications. 1922a1f7e5f8SHajimu UMEMOTO */ 19239a4f9608SHajimu UMEMOTO bzero(&fromsa, sizeof(fromsa)); 19249a4f9608SHajimu UMEMOTO fromsa.sin6_family = AF_INET6; 1925a1f7e5f8SHajimu UMEMOTO fromsa.sin6_len = sizeof(struct sockaddr_in6); 1926a1f7e5f8SHajimu UMEMOTO fromsa.sin6_addr = ip6->ip6_src; 1927a1f7e5f8SHajimu UMEMOTO if (sa6_recoverscope(&fromsa)) { 1928a1f7e5f8SHajimu UMEMOTO m_freem(m); 1929a1f7e5f8SHajimu UMEMOTO return (IPPROTO_DONE); 1930a1f7e5f8SHajimu UMEMOTO } 193182cd038dSYoshinobu Inoue 1932603724d3SBjoern A. Zeeb INP_INFO_RLOCK(&V_ripcbinfo); 1933603724d3SBjoern A. Zeeb LIST_FOREACH(in6p, &V_ripcb, inp_list) { 1934b11e21aeSAlexander Motin if ((in6p->inp_vflag & INP_IPV6) == 0) 193582cd038dSYoshinobu Inoue continue; 1936fc384fa5SBjoern A. Zeeb if (in6p->inp_ip_p != IPPROTO_ICMPV6) 1937b11e21aeSAlexander Motin continue; 193882cd038dSYoshinobu Inoue if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 193982cd038dSYoshinobu Inoue !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1940b11e21aeSAlexander Motin continue; 194182cd038dSYoshinobu Inoue if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 194282cd038dSYoshinobu Inoue !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1943b11e21aeSAlexander Motin continue; 19446c5bbf5cSAlexander Motin INP_RLOCK(in6p); 19452f1ff0cdSRobert Watson if (ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 19466c5bbf5cSAlexander Motin in6p->in6p_icmp6filt)) { 19476c5bbf5cSAlexander Motin INP_RUNLOCK(in6p); 1948b11e21aeSAlexander Motin continue; 19496c5bbf5cSAlexander Motin } 1950aba53ef0SKip Macy if (last != NULL) { 1951657db3c8SHajimu UMEMOTO struct mbuf *n = NULL; 1952657db3c8SHajimu UMEMOTO 1953657db3c8SHajimu UMEMOTO /* 1954657db3c8SHajimu UMEMOTO * Recent network drivers tend to allocate a single 1955657db3c8SHajimu UMEMOTO * mbuf cluster, rather than to make a couple of 1956657db3c8SHajimu UMEMOTO * mbufs without clusters. Also, since the IPv6 code 1957657db3c8SHajimu UMEMOTO * path tries to avoid m_pullup(), it is highly 1958657db3c8SHajimu UMEMOTO * probable that we still have an mbuf cluster here 1959657db3c8SHajimu UMEMOTO * even though the necessary length can be stored in an 1960657db3c8SHajimu UMEMOTO * mbuf's internal buffer. 1961657db3c8SHajimu UMEMOTO * Meanwhile, the default size of the receive socket 1962657db3c8SHajimu UMEMOTO * buffer for raw sockets is not so large. This means 1963657db3c8SHajimu UMEMOTO * the possibility of packet loss is relatively higher 1964657db3c8SHajimu UMEMOTO * than before. To avoid this scenario, we copy the 1965657db3c8SHajimu UMEMOTO * received data to a separate mbuf that does not use 1966657db3c8SHajimu UMEMOTO * a cluster, if possible. 1967657db3c8SHajimu UMEMOTO * XXX: it is better to copy the data after stripping 1968657db3c8SHajimu UMEMOTO * intermediate headers. 1969657db3c8SHajimu UMEMOTO */ 1970657db3c8SHajimu UMEMOTO if ((m->m_flags & M_EXT) && m->m_next == NULL && 1971657db3c8SHajimu UMEMOTO m->m_len <= MHLEN) { 19727b07d1beSGleb Smirnoff n = m_get(M_NOWAIT, m->m_type); 1973657db3c8SHajimu UMEMOTO if (n != NULL) { 1974c543ec4eSGeorge V. Neville-Neil if (m_dup_pkthdr(n, m, M_NOWAIT)) { 1975c543ec4eSGeorge V. Neville-Neil bcopy(m->m_data, n->m_data, 1976c543ec4eSGeorge V. Neville-Neil m->m_len); 1977657db3c8SHajimu UMEMOTO n->m_len = m->m_len; 1978c543ec4eSGeorge V. Neville-Neil } else { 1979c543ec4eSGeorge V. Neville-Neil m_free(n); 1980c543ec4eSGeorge V. Neville-Neil n = NULL; 1981c543ec4eSGeorge V. Neville-Neil } 1982657db3c8SHajimu UMEMOTO } 1983657db3c8SHajimu UMEMOTO } 1984657db3c8SHajimu UMEMOTO if (n != NULL || 1985c3bef61eSKevin Lo (n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) != NULL) { 198697590249SBjoern A. Zeeb if (last->inp_flags & INP_CONTROLOPTS) 198711de19f4SHajimu UMEMOTO ip6_savecontrol(last, n, &opts); 198882cd038dSYoshinobu Inoue /* strip intermediate headers */ 198982cd038dSYoshinobu Inoue m_adj(n, off); 1990fc384fa5SBjoern A. Zeeb SOCKBUF_LOCK(&last->inp_socket->so_rcv); 1991c9db0fadSRobert Watson if (sbappendaddr_locked( 1992fc384fa5SBjoern A. Zeeb &last->inp_socket->so_rcv, 19939a4f9608SHajimu UMEMOTO (struct sockaddr *)&fromsa, n, opts) 199406cd0a3fSHajimu UMEMOTO == 0) { 199582cd038dSYoshinobu Inoue /* should notify about lost packet */ 199682cd038dSYoshinobu Inoue m_freem(n); 199733841545SHajimu UMEMOTO if (opts) { 199882cd038dSYoshinobu Inoue m_freem(opts); 199933841545SHajimu UMEMOTO } 2000c9db0fadSRobert Watson SOCKBUF_UNLOCK( 2001fc384fa5SBjoern A. Zeeb &last->inp_socket->so_rcv); 20024cc20ab1SSeigo Tanimura } else 2003fc384fa5SBjoern A. Zeeb sorwakeup_locked(last->inp_socket); 200482cd038dSYoshinobu Inoue opts = NULL; 200582cd038dSYoshinobu Inoue } 2006bb145f60SRobert Watson INP_RUNLOCK(last); 200782cd038dSYoshinobu Inoue } 200882cd038dSYoshinobu Inoue last = in6p; 200982cd038dSYoshinobu Inoue } 2010603724d3SBjoern A. Zeeb INP_INFO_RUNLOCK(&V_ripcbinfo); 2011aba53ef0SKip Macy if (last != NULL) { 201297590249SBjoern A. Zeeb if (last->inp_flags & INP_CONTROLOPTS) 201311de19f4SHajimu UMEMOTO ip6_savecontrol(last, m, &opts); 201482cd038dSYoshinobu Inoue /* strip intermediate headers */ 201582cd038dSYoshinobu Inoue m_adj(m, off); 2016657db3c8SHajimu UMEMOTO 2017657db3c8SHajimu UMEMOTO /* avoid using mbuf clusters if possible (see above) */ 2018657db3c8SHajimu UMEMOTO if ((m->m_flags & M_EXT) && m->m_next == NULL && 2019657db3c8SHajimu UMEMOTO m->m_len <= MHLEN) { 2020657db3c8SHajimu UMEMOTO struct mbuf *n; 2021657db3c8SHajimu UMEMOTO 20227b07d1beSGleb Smirnoff n = m_get(M_NOWAIT, m->m_type); 2023657db3c8SHajimu UMEMOTO if (n != NULL) { 2024c543ec4eSGeorge V. Neville-Neil if (m_dup_pkthdr(n, m, M_NOWAIT)) { 2025657db3c8SHajimu UMEMOTO bcopy(m->m_data, n->m_data, m->m_len); 2026657db3c8SHajimu UMEMOTO n->m_len = m->m_len; 2027657db3c8SHajimu UMEMOTO 2028657db3c8SHajimu UMEMOTO m_freem(m); 2029657db3c8SHajimu UMEMOTO m = n; 2030c543ec4eSGeorge V. Neville-Neil } else { 2031c543ec4eSGeorge V. Neville-Neil m_freem(n); 2032c543ec4eSGeorge V. Neville-Neil n = NULL; 2033c543ec4eSGeorge V. Neville-Neil } 2034657db3c8SHajimu UMEMOTO } 2035657db3c8SHajimu UMEMOTO } 2036fc384fa5SBjoern A. Zeeb SOCKBUF_LOCK(&last->inp_socket->so_rcv); 2037fc384fa5SBjoern A. Zeeb if (sbappendaddr_locked(&last->inp_socket->so_rcv, 20389a4f9608SHajimu UMEMOTO (struct sockaddr *)&fromsa, m, opts) == 0) { 203982cd038dSYoshinobu Inoue m_freem(m); 204082cd038dSYoshinobu Inoue if (opts) 204182cd038dSYoshinobu Inoue m_freem(opts); 2042fc384fa5SBjoern A. Zeeb SOCKBUF_UNLOCK(&last->inp_socket->so_rcv); 20434cc20ab1SSeigo Tanimura } else 2044fc384fa5SBjoern A. Zeeb sorwakeup_locked(last->inp_socket); 2045bb145f60SRobert Watson INP_RUNLOCK(last); 204682cd038dSYoshinobu Inoue } else { 204782cd038dSYoshinobu Inoue m_freem(m); 204833cde130SBruce M Simpson IP6STAT_DEC(ip6s_delivered); 204982cd038dSYoshinobu Inoue } 205082cd038dSYoshinobu Inoue return IPPROTO_DONE; 205182cd038dSYoshinobu Inoue } 205282cd038dSYoshinobu Inoue 205382cd038dSYoshinobu Inoue /* 205482cd038dSYoshinobu Inoue * Reflect the ip6 packet back to the source. 2055686cdd19SJun-ichiro itojun Hagino * OFF points to the icmp6 header, counted from the top of the mbuf. 205682cd038dSYoshinobu Inoue */ 205782cd038dSYoshinobu Inoue void 20581272577eSXin LI icmp6_reflect(struct mbuf *m, size_t off) 205982cd038dSYoshinobu Inoue { 2060ab861e6cSAlexander V. Chernikov struct in6_addr src6, *srcp; 2061686cdd19SJun-ichiro itojun Hagino struct ip6_hdr *ip6; 206282cd038dSYoshinobu Inoue struct icmp6_hdr *icmp6; 20638c0fec80SRobert Watson struct in6_ifaddr *ia = NULL; 20643e88eb90SAndrey V. Elsukov struct ifnet *outif = NULL; 2065686cdd19SJun-ichiro itojun Hagino int plen; 2066ab861e6cSAlexander V. Chernikov int type, code, hlim; 206782cd038dSYoshinobu Inoue 2068686cdd19SJun-ichiro itojun Hagino /* too short to reflect */ 2069686cdd19SJun-ichiro itojun Hagino if (off < sizeof(struct ip6_hdr)) { 207033841545SHajimu UMEMOTO nd6log((LOG_DEBUG, 207133841545SHajimu UMEMOTO "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2072686cdd19SJun-ichiro itojun Hagino (u_long)off, (u_long)sizeof(struct ip6_hdr), 207333841545SHajimu UMEMOTO __FILE__, __LINE__)); 2074686cdd19SJun-ichiro itojun Hagino goto bad; 2075686cdd19SJun-ichiro itojun Hagino } 2076686cdd19SJun-ichiro itojun Hagino 207782cd038dSYoshinobu Inoue /* 207882cd038dSYoshinobu Inoue * If there are extra headers between IPv6 and ICMPv6, strip 207982cd038dSYoshinobu Inoue * off that header first. 208082cd038dSYoshinobu Inoue */ 2081686cdd19SJun-ichiro itojun Hagino #ifdef DIAGNOSTIC 2082686cdd19SJun-ichiro itojun Hagino if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2083686cdd19SJun-ichiro itojun Hagino panic("assumption failed in icmp6_reflect"); 2084686cdd19SJun-ichiro itojun Hagino #endif 2085686cdd19SJun-ichiro itojun Hagino if (off > sizeof(struct ip6_hdr)) { 2086686cdd19SJun-ichiro itojun Hagino size_t l; 2087686cdd19SJun-ichiro itojun Hagino struct ip6_hdr nip6; 208882cd038dSYoshinobu Inoue 2089686cdd19SJun-ichiro itojun Hagino l = off - sizeof(struct ip6_hdr); 2090686cdd19SJun-ichiro itojun Hagino m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 2091686cdd19SJun-ichiro itojun Hagino m_adj(m, l); 2092686cdd19SJun-ichiro itojun Hagino l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2093686cdd19SJun-ichiro itojun Hagino if (m->m_len < l) { 2094686cdd19SJun-ichiro itojun Hagino if ((m = m_pullup(m, l)) == NULL) 2095686cdd19SJun-ichiro itojun Hagino return; 209682cd038dSYoshinobu Inoue } 2097686cdd19SJun-ichiro itojun Hagino bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 2098686cdd19SJun-ichiro itojun Hagino } else /* off == sizeof(struct ip6_hdr) */ { 2099686cdd19SJun-ichiro itojun Hagino size_t l; 2100686cdd19SJun-ichiro itojun Hagino l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2101686cdd19SJun-ichiro itojun Hagino if (m->m_len < l) { 2102686cdd19SJun-ichiro itojun Hagino if ((m = m_pullup(m, l)) == NULL) 2103686cdd19SJun-ichiro itojun Hagino return; 210482cd038dSYoshinobu Inoue } 2105686cdd19SJun-ichiro itojun Hagino } 2106686cdd19SJun-ichiro itojun Hagino plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 210782cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 210882cd038dSYoshinobu Inoue ip6->ip6_nxt = IPPROTO_ICMPV6; 210982cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)(ip6 + 1); 211082cd038dSYoshinobu Inoue type = icmp6->icmp6_type; /* keep type for statistics */ 211182cd038dSYoshinobu Inoue code = icmp6->icmp6_code; /* ditto. */ 2112ab861e6cSAlexander V. Chernikov hlim = 0; 2113ab861e6cSAlexander V. Chernikov srcp = NULL; 211482cd038dSYoshinobu Inoue 211582cd038dSYoshinobu Inoue /* 211682cd038dSYoshinobu Inoue * If the incoming packet was addressed directly to us (i.e. unicast), 211782cd038dSYoshinobu Inoue * use dst as the src for the reply. 211806cd0a3fSHajimu UMEMOTO * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2119686cdd19SJun-ichiro itojun Hagino * (for example) when we encounter an error while forwarding procedure 2120686cdd19SJun-ichiro itojun Hagino * destined to a duplicated address of ours. 212182cd038dSYoshinobu Inoue */ 21223e88eb90SAndrey V. Elsukov if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 21233e88eb90SAndrey V. Elsukov ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */); 21243e88eb90SAndrey V. Elsukov if (ia != NULL && !(ia->ia6_flags & 2125ab861e6cSAlexander V. Chernikov (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) { 2126ab861e6cSAlexander V. Chernikov src6 = ia->ia_addr.sin6_addr; 2127ab861e6cSAlexander V. Chernikov srcp = &src6; 2128ab861e6cSAlexander V. Chernikov 2129ab861e6cSAlexander V. Chernikov if (m->m_pkthdr.rcvif != NULL) { 2130ab861e6cSAlexander V. Chernikov /* XXX: This may not be the outgoing interface */ 2131ab861e6cSAlexander V. Chernikov hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim; 2132ab861e6cSAlexander V. Chernikov } else 2133ab861e6cSAlexander V. Chernikov hlim = V_ip6_defhlim; 2134ab861e6cSAlexander V. Chernikov } 2135ab861e6cSAlexander V. Chernikov if (ia != NULL) 2136ab861e6cSAlexander V. Chernikov ifa_free(&ia->ia_ifa); 213782cd038dSYoshinobu Inoue } 213882cd038dSYoshinobu Inoue 213988d166bfSBjoern A. Zeeb if (srcp == NULL) { 2140601c0b8bSAlexander V. Chernikov int error; 2141601c0b8bSAlexander V. Chernikov struct in6_addr dst6; 2142601c0b8bSAlexander V. Chernikov uint32_t scopeid; 214333841545SHajimu UMEMOTO 214482cd038dSYoshinobu Inoue /* 2145686cdd19SJun-ichiro itojun Hagino * This case matches to multicasts, our anycast, or unicasts 214633841545SHajimu UMEMOTO * that we do not own. Select a source address based on the 214733841545SHajimu UMEMOTO * source address of the erroneous packet. 214882cd038dSYoshinobu Inoue */ 21495a03e781SAndrey V. Elsukov in6_splitscope(&ip6->ip6_src, &dst6, &scopeid); 2150601c0b8bSAlexander V. Chernikov error = in6_selectsrc_addr(RT_DEFAULT_FIB, &dst6, 2151601c0b8bSAlexander V. Chernikov scopeid, NULL, &src6, &hlim); 2152a1f7e5f8SHajimu UMEMOTO 2153601c0b8bSAlexander V. Chernikov if (error) { 21541d54aa3bSBjoern A. Zeeb char ip6buf[INET6_ADDRSTRLEN]; 215533841545SHajimu UMEMOTO nd6log((LOG_DEBUG, 215633841545SHajimu UMEMOTO "icmp6_reflect: source can't be determined: " 215733841545SHajimu UMEMOTO "dst=%s, error=%d\n", 2158601c0b8bSAlexander V. Chernikov ip6_sprintf(ip6buf, &ip6->ip6_dst), error)); 215982cd038dSYoshinobu Inoue goto bad; 216033841545SHajimu UMEMOTO } 2161ab861e6cSAlexander V. Chernikov srcp = &src6; 216233841545SHajimu UMEMOTO } 21633e88eb90SAndrey V. Elsukov /* 21643e88eb90SAndrey V. Elsukov * ip6_input() drops a packet if its src is multicast. 21653e88eb90SAndrey V. Elsukov * So, the src is never multicast. 21663e88eb90SAndrey V. Elsukov */ 21673e88eb90SAndrey V. Elsukov ip6->ip6_dst = ip6->ip6_src; 216888d166bfSBjoern A. Zeeb ip6->ip6_src = *srcp; 216982cd038dSYoshinobu Inoue ip6->ip6_flow = 0; 2170686cdd19SJun-ichiro itojun Hagino ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2171686cdd19SJun-ichiro itojun Hagino ip6->ip6_vfc |= IPV6_VERSION; 217282cd038dSYoshinobu Inoue ip6->ip6_nxt = IPPROTO_ICMPV6; 2173ab861e6cSAlexander V. Chernikov ip6->ip6_hlim = hlim; 217482cd038dSYoshinobu Inoue 217582cd038dSYoshinobu Inoue icmp6->icmp6_cksum = 0; 217682cd038dSYoshinobu Inoue icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 217782cd038dSYoshinobu Inoue sizeof(struct ip6_hdr), plen); 217882cd038dSYoshinobu Inoue 217982cd038dSYoshinobu Inoue /* 218033841545SHajimu UMEMOTO * XXX option handling 218182cd038dSYoshinobu Inoue */ 218282cd038dSYoshinobu Inoue 218382cd038dSYoshinobu Inoue m->m_flags &= ~(M_BCAST|M_MCAST); 218482cd038dSYoshinobu Inoue 21855d846453SSam Leffler ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 218682cd038dSYoshinobu Inoue if (outif) 218782cd038dSYoshinobu Inoue icmp6_ifoutstat_inc(outif, type, code); 218882cd038dSYoshinobu Inoue 218982cd038dSYoshinobu Inoue return; 219082cd038dSYoshinobu Inoue 219182cd038dSYoshinobu Inoue bad: 219282cd038dSYoshinobu Inoue m_freem(m); 219382cd038dSYoshinobu Inoue return; 219482cd038dSYoshinobu Inoue } 219582cd038dSYoshinobu Inoue 219682cd038dSYoshinobu Inoue void 21971272577eSXin LI icmp6_fasttimo(void) 219882cd038dSYoshinobu Inoue { 2199686cdd19SJun-ichiro itojun Hagino 220033cde130SBruce M Simpson mld_fasttimo(); 220133cde130SBruce M Simpson } 220233cde130SBruce M Simpson 220333cde130SBruce M Simpson void 220433cde130SBruce M Simpson icmp6_slowtimo(void) 220533cde130SBruce M Simpson { 220633cde130SBruce M Simpson 220733cde130SBruce M Simpson mld_slowtimo(); 220882cd038dSYoshinobu Inoue } 220982cd038dSYoshinobu Inoue 221082cd038dSYoshinobu Inoue static const char * 22111272577eSXin LI icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6, 22121272577eSXin LI struct in6_addr *tgt6) 221382cd038dSYoshinobu Inoue { 221482cd038dSYoshinobu Inoue static char buf[1024]; 22151d54aa3bSBjoern A. Zeeb char ip6bufs[INET6_ADDRSTRLEN]; 22161d54aa3bSBjoern A. Zeeb char ip6bufd[INET6_ADDRSTRLEN]; 22171d54aa3bSBjoern A. Zeeb char ip6buft[INET6_ADDRSTRLEN]; 221882cd038dSYoshinobu Inoue snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 22191d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6), 22201d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6buft, tgt6)); 222182cd038dSYoshinobu Inoue return buf; 222282cd038dSYoshinobu Inoue } 222382cd038dSYoshinobu Inoue 222482cd038dSYoshinobu Inoue void 22251272577eSXin LI icmp6_redirect_input(struct mbuf *m, int off) 222682cd038dSYoshinobu Inoue { 22272cb64cb2SGeorge V. Neville-Neil struct ifnet *ifp; 222882cd038dSYoshinobu Inoue struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2229686cdd19SJun-ichiro itojun Hagino struct nd_redirect *nd_rd; 223082cd038dSYoshinobu Inoue int icmp6len = ntohs(ip6->ip6_plen); 223182cd038dSYoshinobu Inoue char *lladdr = NULL; 223282cd038dSYoshinobu Inoue int lladdrlen = 0; 223382cd038dSYoshinobu Inoue int is_router; 223482cd038dSYoshinobu Inoue int is_onlink; 223582cd038dSYoshinobu Inoue struct in6_addr src6 = ip6->ip6_src; 2236686cdd19SJun-ichiro itojun Hagino struct in6_addr redtgt6; 2237686cdd19SJun-ichiro itojun Hagino struct in6_addr reddst6; 223882cd038dSYoshinobu Inoue union nd_opts ndopts; 22391d54aa3bSBjoern A. Zeeb char ip6buf[INET6_ADDRSTRLEN]; 224082cd038dSYoshinobu Inoue 224137c1ff48SGleb Smirnoff M_ASSERTPKTHDR(m); 224237c1ff48SGleb Smirnoff KASSERT(m->m_pkthdr.rcvif != NULL, ("%s: no rcvif", __func__)); 22432cb64cb2SGeorge V. Neville-Neil 22442cb64cb2SGeorge V. Neville-Neil ifp = m->m_pkthdr.rcvif; 22452cb64cb2SGeorge V. Neville-Neil 224682cd038dSYoshinobu Inoue /* XXX if we are router, we don't update route by icmp6 redirect */ 2247603724d3SBjoern A. Zeeb if (V_ip6_forwarding) 2248686cdd19SJun-ichiro itojun Hagino goto freeit; 2249603724d3SBjoern A. Zeeb if (!V_icmp6_rediraccept) 2250686cdd19SJun-ichiro itojun Hagino goto freeit; 2251686cdd19SJun-ichiro itojun Hagino 2252686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 2253686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_CHECK(m, off, icmp6len,); 2254686cdd19SJun-ichiro itojun Hagino nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 2255686cdd19SJun-ichiro itojun Hagino #else 2256686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2257686cdd19SJun-ichiro itojun Hagino if (nd_rd == NULL) { 2258e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 225982cd038dSYoshinobu Inoue return; 2260686cdd19SJun-ichiro itojun Hagino } 2261686cdd19SJun-ichiro itojun Hagino #endif 2262686cdd19SJun-ichiro itojun Hagino redtgt6 = nd_rd->nd_rd_target; 2263686cdd19SJun-ichiro itojun Hagino reddst6 = nd_rd->nd_rd_dst; 226482cd038dSYoshinobu Inoue 2265a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) || 2266a1f7e5f8SHajimu UMEMOTO in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) { 2267a1f7e5f8SHajimu UMEMOTO goto freeit; 2268a1f7e5f8SHajimu UMEMOTO } 226982cd038dSYoshinobu Inoue 227082cd038dSYoshinobu Inoue /* validation */ 227182cd038dSYoshinobu Inoue if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 227233841545SHajimu UMEMOTO nd6log((LOG_ERR, 227382cd038dSYoshinobu Inoue "ICMP6 redirect sent from %s rejected; " 227406cd0a3fSHajimu UMEMOTO "must be from linklocal\n", 22751d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6buf, &src6))); 227633841545SHajimu UMEMOTO goto bad; 227782cd038dSYoshinobu Inoue } 227882cd038dSYoshinobu Inoue if (ip6->ip6_hlim != 255) { 227933841545SHajimu UMEMOTO nd6log((LOG_ERR, 228082cd038dSYoshinobu Inoue "ICMP6 redirect sent from %s rejected; " 228182cd038dSYoshinobu Inoue "hlim=%d (must be 255)\n", 22821d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim)); 228333841545SHajimu UMEMOTO goto bad; 228482cd038dSYoshinobu Inoue } 228582cd038dSYoshinobu Inoue { 228682cd038dSYoshinobu Inoue /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 22879977be4aSAlexander V. Chernikov struct nhop6_basic nh6; 22889977be4aSAlexander V. Chernikov struct in6_addr kdst; 22899977be4aSAlexander V. Chernikov uint32_t scopeid; 229082cd038dSYoshinobu Inoue 22919977be4aSAlexander V. Chernikov in6_splitscope(&reddst6, &kdst, &scopeid); 22929977be4aSAlexander V. Chernikov if (fib6_lookup_nh_basic(RT_DEFAULT_FIB, &kdst, scopeid, 0, 0,&nh6)==0){ 22939977be4aSAlexander V. Chernikov if ((nh6.nh_flags & NHF_GATEWAY) == 0) { 229433841545SHajimu UMEMOTO nd6log((LOG_ERR, 2295deebc913SHajimu UMEMOTO "ICMP6 redirect rejected; no route " 2296deebc913SHajimu UMEMOTO "with inet6 gateway found for redirect dst: %s\n", 229733841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 229833841545SHajimu UMEMOTO goto bad; 2299deebc913SHajimu UMEMOTO } 2300deebc913SHajimu UMEMOTO 23019977be4aSAlexander V. Chernikov if (IN6_ARE_ADDR_EQUAL(&src6, &nh6.nh_addr) == 0) { 230233841545SHajimu UMEMOTO nd6log((LOG_ERR, 230382cd038dSYoshinobu Inoue "ICMP6 redirect rejected; " 230482cd038dSYoshinobu Inoue "not equal to gw-for-src=%s (must be same): " 230582cd038dSYoshinobu Inoue "%s\n", 23069977be4aSAlexander V. Chernikov ip6_sprintf(ip6buf, &nh6.nh_addr), 230733841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 230833841545SHajimu UMEMOTO goto bad; 230982cd038dSYoshinobu Inoue } 231082cd038dSYoshinobu Inoue } else { 231133841545SHajimu UMEMOTO nd6log((LOG_ERR, 231282cd038dSYoshinobu Inoue "ICMP6 redirect rejected; " 231382cd038dSYoshinobu Inoue "no route found for redirect dst: %s\n", 231433841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 231533841545SHajimu UMEMOTO goto bad; 231682cd038dSYoshinobu Inoue } 231782cd038dSYoshinobu Inoue } 231882cd038dSYoshinobu Inoue if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 231933841545SHajimu UMEMOTO nd6log((LOG_ERR, 232082cd038dSYoshinobu Inoue "ICMP6 redirect rejected; " 232182cd038dSYoshinobu Inoue "redirect dst must be unicast: %s\n", 232233841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 232333841545SHajimu UMEMOTO goto bad; 232482cd038dSYoshinobu Inoue } 232582cd038dSYoshinobu Inoue 232682cd038dSYoshinobu Inoue is_router = is_onlink = 0; 232782cd038dSYoshinobu Inoue if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 232882cd038dSYoshinobu Inoue is_router = 1; /* router case */ 232982cd038dSYoshinobu Inoue if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 233082cd038dSYoshinobu Inoue is_onlink = 1; /* on-link destination case */ 233182cd038dSYoshinobu Inoue if (!is_router && !is_onlink) { 233233841545SHajimu UMEMOTO nd6log((LOG_ERR, 233382cd038dSYoshinobu Inoue "ICMP6 redirect rejected; " 233482cd038dSYoshinobu Inoue "neither router case nor onlink case: %s\n", 233533841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 233633841545SHajimu UMEMOTO goto bad; 233782cd038dSYoshinobu Inoue } 233882cd038dSYoshinobu Inoue 233982cd038dSYoshinobu Inoue icmp6len -= sizeof(*nd_rd); 234082cd038dSYoshinobu Inoue nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 234182cd038dSYoshinobu Inoue if (nd6_options(&ndopts) < 0) { 234237c1ff48SGleb Smirnoff nd6log((LOG_INFO, "%s: invalid ND option, rejected: %s\n", 234337c1ff48SGleb Smirnoff __func__, icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 234433841545SHajimu UMEMOTO /* nd6_options have incremented stats */ 2345686cdd19SJun-ichiro itojun Hagino goto freeit; 234682cd038dSYoshinobu Inoue } 234782cd038dSYoshinobu Inoue 234882cd038dSYoshinobu Inoue if (ndopts.nd_opts_tgt_lladdr) { 234982cd038dSYoshinobu Inoue lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 235082cd038dSYoshinobu Inoue lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 235182cd038dSYoshinobu Inoue } 235282cd038dSYoshinobu Inoue 235382cd038dSYoshinobu Inoue if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 235437c1ff48SGleb Smirnoff nd6log((LOG_INFO, "%s: lladdrlen mismatch for %s " 235582cd038dSYoshinobu Inoue "(if %d, icmp6 packet %d): %s\n", 235637c1ff48SGleb Smirnoff __func__, ip6_sprintf(ip6buf, &redtgt6), 23571d54aa3bSBjoern A. Zeeb ifp->if_addrlen, lladdrlen - 2, 235833841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 235933841545SHajimu UMEMOTO goto bad; 236082cd038dSYoshinobu Inoue } 236182cd038dSYoshinobu Inoue 2362bfbc08b8SBjoern A. Zeeb /* Validation passed. */ 2363bfbc08b8SBjoern A. Zeeb 236482cd038dSYoshinobu Inoue /* RFC 2461 8.3 */ 236582cd038dSYoshinobu Inoue nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 236682cd038dSYoshinobu Inoue is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 236782cd038dSYoshinobu Inoue 236817a03656SEric van Gyzen /* 236917a03656SEric van Gyzen * Install a gateway route in the better-router case or an interface 237017a03656SEric van Gyzen * route in the on-link-destination case. 237117a03656SEric van Gyzen */ 237217a03656SEric van Gyzen { 237382cd038dSYoshinobu Inoue struct sockaddr_in6 sdst; 237482cd038dSYoshinobu Inoue struct sockaddr_in6 sgw; 237582cd038dSYoshinobu Inoue struct sockaddr_in6 ssrc; 237617a03656SEric van Gyzen struct sockaddr *gw; 237717a03656SEric van Gyzen int rt_flags; 237881d5d46bSBjoern A. Zeeb u_int fibnum; 237982cd038dSYoshinobu Inoue 238082cd038dSYoshinobu Inoue bzero(&sdst, sizeof(sdst)); 238182cd038dSYoshinobu Inoue bzero(&ssrc, sizeof(ssrc)); 238217a03656SEric van Gyzen sdst.sin6_family = ssrc.sin6_family = AF_INET6; 238317a03656SEric van Gyzen sdst.sin6_len = ssrc.sin6_len = sizeof(struct sockaddr_in6); 238482cd038dSYoshinobu Inoue bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 238582cd038dSYoshinobu Inoue bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 238617a03656SEric van Gyzen rt_flags = RTF_HOST; 238717a03656SEric van Gyzen if (is_router) { 238817a03656SEric van Gyzen bzero(&sgw, sizeof(sgw)); 238917a03656SEric van Gyzen sgw.sin6_family = AF_INET6; 239017a03656SEric van Gyzen sgw.sin6_len = sizeof(struct sockaddr_in6); 239117a03656SEric van Gyzen bcopy(&redtgt6, &sgw.sin6_addr, 239217a03656SEric van Gyzen sizeof(struct in6_addr)); 239317a03656SEric van Gyzen gw = (struct sockaddr *)&sgw; 239417a03656SEric van Gyzen rt_flags |= RTF_GATEWAY; 239517a03656SEric van Gyzen } else 239617a03656SEric van Gyzen gw = ifp->if_addr->ifa_addr; 239781d5d46bSBjoern A. Zeeb for (fibnum = 0; fibnum < rt_numfibs; fibnum++) 239817a03656SEric van Gyzen in6_rtredirect((struct sockaddr *)&sdst, gw, 239917a03656SEric van Gyzen (struct sockaddr *)NULL, rt_flags, 240017a03656SEric van Gyzen (struct sockaddr *)&ssrc, fibnum); 240182cd038dSYoshinobu Inoue } 240282cd038dSYoshinobu Inoue /* finally update cached route in each socket via pfctlinput */ 240382cd038dSYoshinobu Inoue { 240482cd038dSYoshinobu Inoue struct sockaddr_in6 sdst; 240582cd038dSYoshinobu Inoue 240682cd038dSYoshinobu Inoue bzero(&sdst, sizeof(sdst)); 240782cd038dSYoshinobu Inoue sdst.sin6_family = AF_INET6; 240882cd038dSYoshinobu Inoue sdst.sin6_len = sizeof(struct sockaddr_in6); 240982cd038dSYoshinobu Inoue bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 241082cd038dSYoshinobu Inoue pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 241182cd038dSYoshinobu Inoue } 2412686cdd19SJun-ichiro itojun Hagino 2413686cdd19SJun-ichiro itojun Hagino freeit: 2414686cdd19SJun-ichiro itojun Hagino m_freem(m); 241533841545SHajimu UMEMOTO return; 241633841545SHajimu UMEMOTO 241733841545SHajimu UMEMOTO bad: 2418e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_badredirect); 241933841545SHajimu UMEMOTO m_freem(m); 242082cd038dSYoshinobu Inoue } 242182cd038dSYoshinobu Inoue 242282cd038dSYoshinobu Inoue void 24231272577eSXin LI icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 242482cd038dSYoshinobu Inoue { 242582cd038dSYoshinobu Inoue struct ifnet *ifp; /* my outgoing interface */ 242682cd038dSYoshinobu Inoue struct in6_addr *ifp_ll6; 242782cd038dSYoshinobu Inoue struct in6_addr *router_ll6; 242882cd038dSYoshinobu Inoue struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 242982cd038dSYoshinobu Inoue struct mbuf *m = NULL; /* newly allocated one */ 24301db8d1f8SAna Kukec struct m_tag *mtag; 243182cd038dSYoshinobu Inoue struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 243282cd038dSYoshinobu Inoue struct nd_redirect *nd_rd; 243356c423b0SKip Macy struct llentry *ln = NULL; 243482cd038dSYoshinobu Inoue size_t maxlen; 243582cd038dSYoshinobu Inoue u_char *p; 243682cd038dSYoshinobu Inoue struct ifnet *outif = NULL; 2437686cdd19SJun-ichiro itojun Hagino struct sockaddr_in6 src_sa; 2438686cdd19SJun-ichiro itojun Hagino 243949dc650cSAndrey V. Elsukov icmp6_errcount(ND_REDIRECT, 0); 244082cd038dSYoshinobu Inoue 244182cd038dSYoshinobu Inoue /* if we are not router, we don't send icmp6 redirect */ 2442603724d3SBjoern A. Zeeb if (!V_ip6_forwarding) 244382cd038dSYoshinobu Inoue goto fail; 244482cd038dSYoshinobu Inoue 244582cd038dSYoshinobu Inoue /* sanity check */ 244682cd038dSYoshinobu Inoue if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 244782cd038dSYoshinobu Inoue goto fail; 244882cd038dSYoshinobu Inoue 244982cd038dSYoshinobu Inoue /* 245082cd038dSYoshinobu Inoue * Address check: 245182cd038dSYoshinobu Inoue * the source address must identify a neighbor, and 245282cd038dSYoshinobu Inoue * the destination address must not be a multicast address 245382cd038dSYoshinobu Inoue * [RFC 2461, sec 8.2] 245482cd038dSYoshinobu Inoue */ 245582cd038dSYoshinobu Inoue sip6 = mtod(m0, struct ip6_hdr *); 2456686cdd19SJun-ichiro itojun Hagino bzero(&src_sa, sizeof(src_sa)); 2457686cdd19SJun-ichiro itojun Hagino src_sa.sin6_family = AF_INET6; 2458686cdd19SJun-ichiro itojun Hagino src_sa.sin6_len = sizeof(src_sa); 2459686cdd19SJun-ichiro itojun Hagino src_sa.sin6_addr = sip6->ip6_src; 2460686cdd19SJun-ichiro itojun Hagino if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 246182cd038dSYoshinobu Inoue goto fail; 246282cd038dSYoshinobu Inoue if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 246382cd038dSYoshinobu Inoue goto fail; /* what should we do here? */ 246482cd038dSYoshinobu Inoue 246582cd038dSYoshinobu Inoue /* rate limit */ 246682cd038dSYoshinobu Inoue if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 246782cd038dSYoshinobu Inoue goto fail; 246882cd038dSYoshinobu Inoue 246982cd038dSYoshinobu Inoue /* 247082cd038dSYoshinobu Inoue * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 247182cd038dSYoshinobu Inoue * we almost always ask for an mbuf cluster for simplicity. 247282cd038dSYoshinobu Inoue * (MHLEN < IPV6_MMTU is almost always true) 247382cd038dSYoshinobu Inoue */ 2474686cdd19SJun-ichiro itojun Hagino #if IPV6_MMTU >= MCLBYTES 2475686cdd19SJun-ichiro itojun Hagino # error assumption failed about IPV6_MMTU and MCLBYTES 2476686cdd19SJun-ichiro itojun Hagino #endif 24777b07d1beSGleb Smirnoff m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 24787b07d1beSGleb Smirnoff if (m == NULL) 247982cd038dSYoshinobu Inoue goto fail; 248081d5d46bSBjoern A. Zeeb M_SETFIB(m, rt->rt_fibnum); 248133841545SHajimu UMEMOTO maxlen = M_TRAILINGSPACE(m); 248282cd038dSYoshinobu Inoue maxlen = min(IPV6_MMTU, maxlen); 248382cd038dSYoshinobu Inoue /* just for safety */ 2484686cdd19SJun-ichiro itojun Hagino if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2485686cdd19SJun-ichiro itojun Hagino ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 248682cd038dSYoshinobu Inoue goto fail; 2487686cdd19SJun-ichiro itojun Hagino } 248882cd038dSYoshinobu Inoue 248982cd038dSYoshinobu Inoue { 249082cd038dSYoshinobu Inoue /* get ip6 linklocal address for ifp(my outgoing interface). */ 2491686cdd19SJun-ichiro itojun Hagino struct in6_ifaddr *ia; 2492686cdd19SJun-ichiro itojun Hagino if ((ia = in6ifa_ifpforlinklocal(ifp, 2493686cdd19SJun-ichiro itojun Hagino IN6_IFF_NOTREADY| 2494686cdd19SJun-ichiro itojun Hagino IN6_IFF_ANYCAST)) == NULL) 249582cd038dSYoshinobu Inoue goto fail; 249682cd038dSYoshinobu Inoue ifp_ll6 = &ia->ia_addr.sin6_addr; 24978c0fec80SRobert Watson /* XXXRW: reference released prematurely. */ 24988c0fec80SRobert Watson ifa_free(&ia->ia_ifa); 249982cd038dSYoshinobu Inoue } 250082cd038dSYoshinobu Inoue 250182cd038dSYoshinobu Inoue /* get ip6 linklocal address for the router. */ 250282cd038dSYoshinobu Inoue if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 250382cd038dSYoshinobu Inoue struct sockaddr_in6 *sin6; 250482cd038dSYoshinobu Inoue sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 250582cd038dSYoshinobu Inoue router_ll6 = &sin6->sin6_addr; 250682cd038dSYoshinobu Inoue if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 250782cd038dSYoshinobu Inoue router_ll6 = (struct in6_addr *)NULL; 250882cd038dSYoshinobu Inoue } else 250982cd038dSYoshinobu Inoue router_ll6 = (struct in6_addr *)NULL; 251082cd038dSYoshinobu Inoue 251182cd038dSYoshinobu Inoue /* ip6 */ 251282cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 251382cd038dSYoshinobu Inoue ip6->ip6_flow = 0; 2514686cdd19SJun-ichiro itojun Hagino ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2515686cdd19SJun-ichiro itojun Hagino ip6->ip6_vfc |= IPV6_VERSION; 251682cd038dSYoshinobu Inoue /* ip6->ip6_plen will be set later */ 251782cd038dSYoshinobu Inoue ip6->ip6_nxt = IPPROTO_ICMPV6; 251882cd038dSYoshinobu Inoue ip6->ip6_hlim = 255; 251982cd038dSYoshinobu Inoue /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 252082cd038dSYoshinobu Inoue bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 252182cd038dSYoshinobu Inoue bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 252282cd038dSYoshinobu Inoue 252382cd038dSYoshinobu Inoue /* ND Redirect */ 252482cd038dSYoshinobu Inoue nd_rd = (struct nd_redirect *)(ip6 + 1); 252582cd038dSYoshinobu Inoue nd_rd->nd_rd_type = ND_REDIRECT; 252682cd038dSYoshinobu Inoue nd_rd->nd_rd_code = 0; 252782cd038dSYoshinobu Inoue nd_rd->nd_rd_reserved = 0; 252882cd038dSYoshinobu Inoue if (rt->rt_flags & RTF_GATEWAY) { 252982cd038dSYoshinobu Inoue /* 253082cd038dSYoshinobu Inoue * nd_rd->nd_rd_target must be a link-local address in 253182cd038dSYoshinobu Inoue * better router cases. 253282cd038dSYoshinobu Inoue */ 253382cd038dSYoshinobu Inoue if (!router_ll6) 253482cd038dSYoshinobu Inoue goto fail; 253582cd038dSYoshinobu Inoue bcopy(router_ll6, &nd_rd->nd_rd_target, 253682cd038dSYoshinobu Inoue sizeof(nd_rd->nd_rd_target)); 253782cd038dSYoshinobu Inoue bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 253882cd038dSYoshinobu Inoue sizeof(nd_rd->nd_rd_dst)); 253982cd038dSYoshinobu Inoue } else { 254082cd038dSYoshinobu Inoue /* make sure redtgt == reddst */ 254182cd038dSYoshinobu Inoue bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 254282cd038dSYoshinobu Inoue sizeof(nd_rd->nd_rd_target)); 254382cd038dSYoshinobu Inoue bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 254482cd038dSYoshinobu Inoue sizeof(nd_rd->nd_rd_dst)); 254582cd038dSYoshinobu Inoue } 254682cd038dSYoshinobu Inoue 254782cd038dSYoshinobu Inoue p = (u_char *)(nd_rd + 1); 254882cd038dSYoshinobu Inoue 254982cd038dSYoshinobu Inoue if (!router_ll6) 255082cd038dSYoshinobu Inoue goto nolladdropt; 255182cd038dSYoshinobu Inoue 255282cd038dSYoshinobu Inoue { 255382cd038dSYoshinobu Inoue /* target lladdr option */ 255482cd038dSYoshinobu Inoue int len; 255582cd038dSYoshinobu Inoue struct nd_opt_hdr *nd_opt; 255682cd038dSYoshinobu Inoue char *lladdr; 255782cd038dSYoshinobu Inoue 255873cb2f38SAndrey V. Elsukov IF_AFDATA_RLOCK(ifp); 25596e6b3f7cSQing Li ln = nd6_lookup(router_ll6, 0, ifp); 256073cb2f38SAndrey V. Elsukov IF_AFDATA_RUNLOCK(ifp); 256156c423b0SKip Macy if (ln == NULL) 256282cd038dSYoshinobu Inoue goto nolladdropt; 25636e6b3f7cSQing Li 2564686cdd19SJun-ichiro itojun Hagino len = sizeof(*nd_opt) + ifp->if_addrlen; 2565686cdd19SJun-ichiro itojun Hagino len = (len + 7) & ~7; /* round by 8 */ 2566686cdd19SJun-ichiro itojun Hagino /* safety check */ 2567686cdd19SJun-ichiro itojun Hagino if (len + (p - (u_char *)ip6) > maxlen) 2568686cdd19SJun-ichiro itojun Hagino goto nolladdropt; 25696e6b3f7cSQing Li 25706e6b3f7cSQing Li if (ln->la_flags & LLE_VALID) { 257182cd038dSYoshinobu Inoue nd_opt = (struct nd_opt_hdr *)p; 257282cd038dSYoshinobu Inoue nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 257382cd038dSYoshinobu Inoue nd_opt->nd_opt_len = len >> 3; 257482cd038dSYoshinobu Inoue lladdr = (char *)(nd_opt + 1); 25754fb3a820SAlexander V. Chernikov bcopy(ln->ll_addr, lladdr, ifp->if_addrlen); 2576686cdd19SJun-ichiro itojun Hagino p += len; 257782cd038dSYoshinobu Inoue } 257882cd038dSYoshinobu Inoue } 257956c423b0SKip Macy nolladdropt: 258056c423b0SKip Macy if (ln != NULL) 258156c423b0SKip Macy LLE_RUNLOCK(ln); 258282cd038dSYoshinobu Inoue 258382cd038dSYoshinobu Inoue m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 258482cd038dSYoshinobu Inoue 258582cd038dSYoshinobu Inoue /* just to be safe */ 2586686cdd19SJun-ichiro itojun Hagino #ifdef M_DECRYPTED /*not openbsd*/ 258782cd038dSYoshinobu Inoue if (m0->m_flags & M_DECRYPTED) 258882cd038dSYoshinobu Inoue goto noredhdropt; 2589686cdd19SJun-ichiro itojun Hagino #endif 2590686cdd19SJun-ichiro itojun Hagino if (p - (u_char *)ip6 > maxlen) 2591686cdd19SJun-ichiro itojun Hagino goto noredhdropt; 259282cd038dSYoshinobu Inoue 259382cd038dSYoshinobu Inoue { 259482cd038dSYoshinobu Inoue /* redirected header option */ 259582cd038dSYoshinobu Inoue int len; 259682cd038dSYoshinobu Inoue struct nd_opt_rd_hdr *nd_opt_rh; 259782cd038dSYoshinobu Inoue 259882cd038dSYoshinobu Inoue /* 259982cd038dSYoshinobu Inoue * compute the maximum size for icmp6 redirect header option. 260082cd038dSYoshinobu Inoue * XXX room for auth header? 260182cd038dSYoshinobu Inoue */ 260282cd038dSYoshinobu Inoue len = maxlen - (p - (u_char *)ip6); 260382cd038dSYoshinobu Inoue len &= ~7; 260482cd038dSYoshinobu Inoue 260582cd038dSYoshinobu Inoue /* This is just for simplicity. */ 260682cd038dSYoshinobu Inoue if (m0->m_pkthdr.len != m0->m_len) { 260782cd038dSYoshinobu Inoue if (m0->m_next) { 260882cd038dSYoshinobu Inoue m_freem(m0->m_next); 260982cd038dSYoshinobu Inoue m0->m_next = NULL; 261082cd038dSYoshinobu Inoue } 261182cd038dSYoshinobu Inoue m0->m_pkthdr.len = m0->m_len; 261282cd038dSYoshinobu Inoue } 261382cd038dSYoshinobu Inoue 261482cd038dSYoshinobu Inoue /* 261582cd038dSYoshinobu Inoue * Redirected header option spec (RFC2461 4.6.3) talks nothing 261682cd038dSYoshinobu Inoue * about padding/truncate rule for the original IP packet. 261706cd0a3fSHajimu UMEMOTO * From the discussion on IPv6imp in Feb 1999, 261806cd0a3fSHajimu UMEMOTO * the consensus was: 261982cd038dSYoshinobu Inoue * - "attach as much as possible" is the goal 262006cd0a3fSHajimu UMEMOTO * - pad if not aligned (original size can be guessed by 262106cd0a3fSHajimu UMEMOTO * original ip6 header) 262282cd038dSYoshinobu Inoue * Following code adds the padding if it is simple enough, 262382cd038dSYoshinobu Inoue * and truncates if not. 262482cd038dSYoshinobu Inoue */ 262582cd038dSYoshinobu Inoue if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 262606cd0a3fSHajimu UMEMOTO panic("assumption failed in %s:%d", __FILE__, 262706cd0a3fSHajimu UMEMOTO __LINE__); 262882cd038dSYoshinobu Inoue 262982cd038dSYoshinobu Inoue if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 263082cd038dSYoshinobu Inoue /* not enough room, truncate */ 263106cd0a3fSHajimu UMEMOTO m0->m_pkthdr.len = m0->m_len = len - 263206cd0a3fSHajimu UMEMOTO sizeof(*nd_opt_rh); 263382cd038dSYoshinobu Inoue } else { 263482cd038dSYoshinobu Inoue /* enough room, pad or truncate */ 263582cd038dSYoshinobu Inoue size_t extra; 263682cd038dSYoshinobu Inoue 263782cd038dSYoshinobu Inoue extra = m0->m_pkthdr.len % 8; 263882cd038dSYoshinobu Inoue if (extra) { 263982cd038dSYoshinobu Inoue /* pad if easy enough, truncate if not */ 264082cd038dSYoshinobu Inoue if (8 - extra <= M_TRAILINGSPACE(m0)) { 264182cd038dSYoshinobu Inoue /* pad */ 264282cd038dSYoshinobu Inoue m0->m_len += (8 - extra); 264382cd038dSYoshinobu Inoue m0->m_pkthdr.len += (8 - extra); 264482cd038dSYoshinobu Inoue } else { 264582cd038dSYoshinobu Inoue /* truncate */ 264682cd038dSYoshinobu Inoue m0->m_pkthdr.len -= extra; 264782cd038dSYoshinobu Inoue m0->m_len -= extra; 264882cd038dSYoshinobu Inoue } 264982cd038dSYoshinobu Inoue } 265082cd038dSYoshinobu Inoue len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 265106cd0a3fSHajimu UMEMOTO m0->m_pkthdr.len = m0->m_len = len - 265206cd0a3fSHajimu UMEMOTO sizeof(*nd_opt_rh); 265382cd038dSYoshinobu Inoue } 265482cd038dSYoshinobu Inoue 265582cd038dSYoshinobu Inoue nd_opt_rh = (struct nd_opt_rd_hdr *)p; 265682cd038dSYoshinobu Inoue bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 265782cd038dSYoshinobu Inoue nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 265882cd038dSYoshinobu Inoue nd_opt_rh->nd_opt_rh_len = len >> 3; 265982cd038dSYoshinobu Inoue p += sizeof(*nd_opt_rh); 266082cd038dSYoshinobu Inoue m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 266182cd038dSYoshinobu Inoue 266282cd038dSYoshinobu Inoue /* connect m0 to m */ 2663db06e8a0SSUZUKI Shinsuke m_tag_delete_chain(m0, NULL); 2664db06e8a0SSUZUKI Shinsuke m0->m_flags &= ~M_PKTHDR; 266582cd038dSYoshinobu Inoue m->m_next = m0; 266682cd038dSYoshinobu Inoue m->m_pkthdr.len = m->m_len + m0->m_len; 2667db06e8a0SSUZUKI Shinsuke m0 = NULL; 266882cd038dSYoshinobu Inoue } 266982cd038dSYoshinobu Inoue noredhdropt:; 2670db06e8a0SSUZUKI Shinsuke if (m0) { 2671db06e8a0SSUZUKI Shinsuke m_freem(m0); 2672db06e8a0SSUZUKI Shinsuke m0 = NULL; 2673db06e8a0SSUZUKI Shinsuke } 267482cd038dSYoshinobu Inoue 26759a4f9608SHajimu UMEMOTO /* XXX: clear embedded link IDs in the inner header */ 26769a4f9608SHajimu UMEMOTO in6_clearscope(&sip6->ip6_src); 26779a4f9608SHajimu UMEMOTO in6_clearscope(&sip6->ip6_dst); 26789a4f9608SHajimu UMEMOTO in6_clearscope(&nd_rd->nd_rd_target); 26799a4f9608SHajimu UMEMOTO in6_clearscope(&nd_rd->nd_rd_dst); 268082cd038dSYoshinobu Inoue 268182cd038dSYoshinobu Inoue ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 268282cd038dSYoshinobu Inoue 268382cd038dSYoshinobu Inoue nd_rd->nd_rd_cksum = 0; 268406cd0a3fSHajimu UMEMOTO nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6, 268506cd0a3fSHajimu UMEMOTO sizeof(*ip6), ntohs(ip6->ip6_plen)); 268682cd038dSYoshinobu Inoue 26871db8d1f8SAna Kukec if (send_sendso_input_hook != NULL) { 26881db8d1f8SAna Kukec mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, sizeof(unsigned short), 26891db8d1f8SAna Kukec M_NOWAIT); 26901db8d1f8SAna Kukec if (mtag == NULL) 26911db8d1f8SAna Kukec goto fail; 26921db8d1f8SAna Kukec *(unsigned short *)(mtag + 1) = nd_rd->nd_rd_type; 26931db8d1f8SAna Kukec m_tag_prepend(m, mtag); 26941db8d1f8SAna Kukec } 26951db8d1f8SAna Kukec 269682cd038dSYoshinobu Inoue /* send the packet to outside... */ 26975d846453SSam Leffler ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 269882cd038dSYoshinobu Inoue if (outif) { 269982cd038dSYoshinobu Inoue icmp6_ifstat_inc(outif, ifs6_out_msg); 270082cd038dSYoshinobu Inoue icmp6_ifstat_inc(outif, ifs6_out_redirect); 270182cd038dSYoshinobu Inoue } 2702e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_outhist[ND_REDIRECT]); 270382cd038dSYoshinobu Inoue 270482cd038dSYoshinobu Inoue return; 270582cd038dSYoshinobu Inoue 270682cd038dSYoshinobu Inoue fail: 270782cd038dSYoshinobu Inoue if (m) 270882cd038dSYoshinobu Inoue m_freem(m); 270982cd038dSYoshinobu Inoue if (m0) 271082cd038dSYoshinobu Inoue m_freem(m0); 271182cd038dSYoshinobu Inoue } 271282cd038dSYoshinobu Inoue 271382cd038dSYoshinobu Inoue /* 271482cd038dSYoshinobu Inoue * ICMPv6 socket option processing. 271582cd038dSYoshinobu Inoue */ 271682cd038dSYoshinobu Inoue int 27171272577eSXin LI icmp6_ctloutput(struct socket *so, struct sockopt *sopt) 271882cd038dSYoshinobu Inoue { 271982cd038dSYoshinobu Inoue int error = 0; 272082cd038dSYoshinobu Inoue int optlen; 272133841545SHajimu UMEMOTO struct inpcb *inp = sotoinpcb(so); 272282cd038dSYoshinobu Inoue int level, op, optname; 272382cd038dSYoshinobu Inoue 272482cd038dSYoshinobu Inoue if (sopt) { 272582cd038dSYoshinobu Inoue level = sopt->sopt_level; 272682cd038dSYoshinobu Inoue op = sopt->sopt_dir; 272782cd038dSYoshinobu Inoue optname = sopt->sopt_name; 272882cd038dSYoshinobu Inoue optlen = sopt->sopt_valsize; 272982cd038dSYoshinobu Inoue } else 273082cd038dSYoshinobu Inoue level = op = optname = optlen = 0; 273133841545SHajimu UMEMOTO 273282cd038dSYoshinobu Inoue if (level != IPPROTO_ICMPV6) { 273382cd038dSYoshinobu Inoue return EINVAL; 273482cd038dSYoshinobu Inoue } 273582cd038dSYoshinobu Inoue 273682cd038dSYoshinobu Inoue switch (op) { 273782cd038dSYoshinobu Inoue case PRCO_SETOPT: 273882cd038dSYoshinobu Inoue switch (optname) { 273982cd038dSYoshinobu Inoue case ICMP6_FILTER: 274082cd038dSYoshinobu Inoue { 2741ae89d5a3SRobert Watson struct icmp6_filter ic6f; 274282cd038dSYoshinobu Inoue 2743ae89d5a3SRobert Watson if (optlen != sizeof(ic6f)) { 274482cd038dSYoshinobu Inoue error = EMSGSIZE; 274582cd038dSYoshinobu Inoue break; 274682cd038dSYoshinobu Inoue } 2747ae89d5a3SRobert Watson error = sooptcopyin(sopt, &ic6f, optlen, optlen); 2748ae89d5a3SRobert Watson if (error == 0) { 2749ae89d5a3SRobert Watson INP_WLOCK(inp); 2750ae89d5a3SRobert Watson *inp->in6p_icmp6filt = ic6f; 2751ae89d5a3SRobert Watson INP_WUNLOCK(inp); 2752ae89d5a3SRobert Watson } 275382cd038dSYoshinobu Inoue break; 275482cd038dSYoshinobu Inoue } 275582cd038dSYoshinobu Inoue 275682cd038dSYoshinobu Inoue default: 275782cd038dSYoshinobu Inoue error = ENOPROTOOPT; 275882cd038dSYoshinobu Inoue break; 275982cd038dSYoshinobu Inoue } 276082cd038dSYoshinobu Inoue break; 276182cd038dSYoshinobu Inoue 276282cd038dSYoshinobu Inoue case PRCO_GETOPT: 276382cd038dSYoshinobu Inoue switch (optname) { 276482cd038dSYoshinobu Inoue case ICMP6_FILTER: 276582cd038dSYoshinobu Inoue { 2766ae89d5a3SRobert Watson struct icmp6_filter ic6f; 2767ae89d5a3SRobert Watson 2768ae89d5a3SRobert Watson INP_RLOCK(inp); 2769ae89d5a3SRobert Watson ic6f = *inp->in6p_icmp6filt; 2770ae89d5a3SRobert Watson INP_RUNLOCK(inp); 2771ae89d5a3SRobert Watson error = sooptcopyout(sopt, &ic6f, sizeof(ic6f)); 277282cd038dSYoshinobu Inoue break; 277382cd038dSYoshinobu Inoue } 277482cd038dSYoshinobu Inoue 277582cd038dSYoshinobu Inoue default: 277682cd038dSYoshinobu Inoue error = ENOPROTOOPT; 277782cd038dSYoshinobu Inoue break; 277882cd038dSYoshinobu Inoue } 277982cd038dSYoshinobu Inoue break; 278082cd038dSYoshinobu Inoue } 278182cd038dSYoshinobu Inoue 278282cd038dSYoshinobu Inoue return (error); 278382cd038dSYoshinobu Inoue } 278482cd038dSYoshinobu Inoue 278582cd038dSYoshinobu Inoue /* 278682cd038dSYoshinobu Inoue * Perform rate limit check. 278782cd038dSYoshinobu Inoue * Returns 0 if it is okay to send the icmp6 packet. 278882cd038dSYoshinobu Inoue * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 278982cd038dSYoshinobu Inoue * limitation. 279082cd038dSYoshinobu Inoue * 279182cd038dSYoshinobu Inoue * XXX per-destination/type check necessary? 27921272577eSXin LI * 27931272577eSXin LI * dst - not used at this moment 27941272577eSXin LI * type - not used at this moment 27951272577eSXin LI * code - not used at this moment 279682cd038dSYoshinobu Inoue */ 279782cd038dSYoshinobu Inoue static int 27981272577eSXin LI icmp6_ratelimit(const struct in6_addr *dst, const int type, 27991272577eSXin LI const int code) 280082cd038dSYoshinobu Inoue { 2801686cdd19SJun-ichiro itojun Hagino int ret; 280282cd038dSYoshinobu Inoue 2803686cdd19SJun-ichiro itojun Hagino ret = 0; /* okay to send */ 280482cd038dSYoshinobu Inoue 2805686cdd19SJun-ichiro itojun Hagino /* PPS limit */ 2806603724d3SBjoern A. Zeeb if (!ppsratecheck(&V_icmp6errppslim_last, &V_icmp6errpps_count, 2807603724d3SBjoern A. Zeeb V_icmp6errppslim)) { 280882cd038dSYoshinobu Inoue /* The packet is subject to rate limit */ 2809686cdd19SJun-ichiro itojun Hagino ret++; 281082cd038dSYoshinobu Inoue } 281182cd038dSYoshinobu Inoue 2812686cdd19SJun-ichiro itojun Hagino return ret; 281382cd038dSYoshinobu Inoue } 2814