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. 4482cd038dSYoshinobu Inoue * 4. 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 66686cdd19SJun-ichiro itojun Hagino #include "opt_inet.h" 67686cdd19SJun-ichiro itojun Hagino #include "opt_inet6.h" 686a800098SYoshinobu Inoue #include "opt_ipsec.h" 6982cd038dSYoshinobu Inoue 7082cd038dSYoshinobu Inoue #include <sys/param.h> 71960ed29cSSeigo Tanimura #include <sys/domain.h> 7276ca6f88SJamie Gritton #include <sys/jail.h> 73960ed29cSSeigo Tanimura #include <sys/kernel.h> 74960ed29cSSeigo Tanimura #include <sys/lock.h> 7533841545SHajimu UMEMOTO #include <sys/malloc.h> 7682cd038dSYoshinobu Inoue #include <sys/mbuf.h> 7782cd038dSYoshinobu Inoue #include <sys/protosw.h> 78960ed29cSSeigo Tanimura #include <sys/signalvar.h> 7982cd038dSYoshinobu Inoue #include <sys/socket.h> 8082cd038dSYoshinobu Inoue #include <sys/socketvar.h> 81960ed29cSSeigo Tanimura #include <sys/sx.h> 8282cd038dSYoshinobu Inoue #include <sys/syslog.h> 83960ed29cSSeigo Tanimura #include <sys/systm.h> 84960ed29cSSeigo Tanimura #include <sys/time.h> 85603724d3SBjoern A. Zeeb #include <sys/vimage.h> 8682cd038dSYoshinobu Inoue 8782cd038dSYoshinobu Inoue #include <net/if.h> 8882cd038dSYoshinobu Inoue #include <net/if_dl.h> 896e6b3f7cSQing Li #include <net/if_llatbl.h> 9082cd038dSYoshinobu Inoue #include <net/if_types.h> 91960ed29cSSeigo Tanimura #include <net/route.h> 924b79449eSBjoern A. Zeeb #include <net/vnet.h> 9382cd038dSYoshinobu Inoue 9482cd038dSYoshinobu Inoue #include <netinet/in.h> 95960ed29cSSeigo Tanimura #include <netinet/in_pcb.h> 9682cd038dSYoshinobu Inoue #include <netinet/in_var.h> 97686cdd19SJun-ichiro itojun Hagino #include <netinet/ip6.h> 98686cdd19SJun-ichiro itojun Hagino #include <netinet/icmp6.h> 9997d8d152SAndre Oppermann #include <netinet/tcp_var.h> 1004b79449eSBjoern A. Zeeb #include <netinet/vinet.h> 1014b79449eSBjoern A. Zeeb 10282cd038dSYoshinobu Inoue #include <netinet6/in6_ifattach.h> 103960ed29cSSeigo Tanimura #include <netinet6/in6_pcb.h> 10482cd038dSYoshinobu Inoue #include <netinet6/ip6protosw.h> 105960ed29cSSeigo Tanimura #include <netinet6/ip6_var.h> 106a1f7e5f8SHajimu UMEMOTO #include <netinet6/scope6_var.h> 107960ed29cSSeigo Tanimura #include <netinet6/mld6_var.h> 108960ed29cSSeigo Tanimura #include <netinet6/nd6.h> 1094b79449eSBjoern A. Zeeb #include <netinet6/vinet6.h> 11082cd038dSYoshinobu Inoue 111b2630c29SGeorge V. Neville-Neil #ifdef IPSEC 112b9234fafSSam Leffler #include <netipsec/ipsec.h> 113b9234fafSSam Leffler #include <netipsec/key.h> 114b9234fafSSam Leffler #endif 115b9234fafSSam Leffler 11682cd038dSYoshinobu Inoue extern struct domain inet6domain; 11797021c24SMarko Zec 11897021c24SMarko Zec #ifdef VIMAGE_GLOBALS 119da2ecc1aSRobert Watson extern struct inpcbinfo ripcbinfo; 12082cd038dSYoshinobu Inoue extern struct inpcbhead ripcb; 121686cdd19SJun-ichiro itojun Hagino extern int icmp6errppslim; 122686cdd19SJun-ichiro itojun Hagino extern int icmp6_nodeinfo; 12382cd038dSYoshinobu Inoue 12444e33a07SMarko Zec struct icmp6stat icmp6stat; 12544e33a07SMarko Zec static int icmp6errpps_count; 12644e33a07SMarko Zec static struct timeval icmp6errppslim_last; 12744e33a07SMarko Zec #endif 12844e33a07SMarko Zec 1299233d8f3SDavid E. O'Brien static void icmp6_errcount(struct icmp6errstat *, int, int); 1309233d8f3SDavid E. O'Brien static int icmp6_rip6_input(struct mbuf **, int); 1319233d8f3SDavid E. O'Brien static int icmp6_ratelimit(const struct in6_addr *, const int, const int); 13282cd038dSYoshinobu Inoue static const char *icmp6_redirect_diag __P((struct in6_addr *, 133686cdd19SJun-ichiro itojun Hagino struct in6_addr *, struct in6_addr *)); 1349233d8f3SDavid E. O'Brien static struct mbuf *ni6_input(struct mbuf *, int); 1359233d8f3SDavid E. O'Brien static struct mbuf *ni6_nametodns(const char *, int, int); 1369233d8f3SDavid E. O'Brien static int ni6_dnsmatch(const char *, int, const char *, int); 13782cd038dSYoshinobu Inoue static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *, 138c66b5feaSHajimu UMEMOTO struct ifnet **, struct in6_addr *)); 139686cdd19SJun-ichiro itojun Hagino static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 14082cd038dSYoshinobu Inoue struct ifnet *, int)); 1419233d8f3SDavid E. O'Brien static int icmp6_notify_error(struct mbuf **, int, int, int); 14282cd038dSYoshinobu Inoue 14333841545SHajimu UMEMOTO 14482cd038dSYoshinobu Inoue void 1451272577eSXin LI icmp6_init(void) 14682cd038dSYoshinobu Inoue { 1478b615593SMarko Zec INIT_VNET_INET6(curvnet); 1481272577eSXin LI 14944e33a07SMarko Zec V_icmp6errpps_count = 0; 15082cd038dSYoshinobu Inoue } 15182cd038dSYoshinobu Inoue 152686cdd19SJun-ichiro itojun Hagino static void 1531272577eSXin LI icmp6_errcount(struct icmp6errstat *stat, int type, int code) 154686cdd19SJun-ichiro itojun Hagino { 155686cdd19SJun-ichiro itojun Hagino switch (type) { 156686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH: 157686cdd19SJun-ichiro itojun Hagino switch (code) { 158686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_NOROUTE: 159686cdd19SJun-ichiro itojun Hagino stat->icp6errs_dst_unreach_noroute++; 160686cdd19SJun-ichiro itojun Hagino return; 161686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_ADMIN: 162686cdd19SJun-ichiro itojun Hagino stat->icp6errs_dst_unreach_admin++; 163686cdd19SJun-ichiro itojun Hagino return; 164686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_BEYONDSCOPE: 165686cdd19SJun-ichiro itojun Hagino stat->icp6errs_dst_unreach_beyondscope++; 166686cdd19SJun-ichiro itojun Hagino return; 167686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_ADDR: 168686cdd19SJun-ichiro itojun Hagino stat->icp6errs_dst_unreach_addr++; 169686cdd19SJun-ichiro itojun Hagino return; 170686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_NOPORT: 171686cdd19SJun-ichiro itojun Hagino stat->icp6errs_dst_unreach_noport++; 172686cdd19SJun-ichiro itojun Hagino return; 173686cdd19SJun-ichiro itojun Hagino } 174686cdd19SJun-ichiro itojun Hagino break; 175686cdd19SJun-ichiro itojun Hagino case ICMP6_PACKET_TOO_BIG: 176686cdd19SJun-ichiro itojun Hagino stat->icp6errs_packet_too_big++; 177686cdd19SJun-ichiro itojun Hagino return; 178686cdd19SJun-ichiro itojun Hagino case ICMP6_TIME_EXCEEDED: 179686cdd19SJun-ichiro itojun Hagino switch (code) { 180686cdd19SJun-ichiro itojun Hagino case ICMP6_TIME_EXCEED_TRANSIT: 181686cdd19SJun-ichiro itojun Hagino stat->icp6errs_time_exceed_transit++; 182686cdd19SJun-ichiro itojun Hagino return; 183686cdd19SJun-ichiro itojun Hagino case ICMP6_TIME_EXCEED_REASSEMBLY: 184686cdd19SJun-ichiro itojun Hagino stat->icp6errs_time_exceed_reassembly++; 185686cdd19SJun-ichiro itojun Hagino return; 186686cdd19SJun-ichiro itojun Hagino } 187686cdd19SJun-ichiro itojun Hagino break; 188686cdd19SJun-ichiro itojun Hagino case ICMP6_PARAM_PROB: 189686cdd19SJun-ichiro itojun Hagino switch (code) { 190686cdd19SJun-ichiro itojun Hagino case ICMP6_PARAMPROB_HEADER: 191686cdd19SJun-ichiro itojun Hagino stat->icp6errs_paramprob_header++; 192686cdd19SJun-ichiro itojun Hagino return; 193686cdd19SJun-ichiro itojun Hagino case ICMP6_PARAMPROB_NEXTHEADER: 194686cdd19SJun-ichiro itojun Hagino stat->icp6errs_paramprob_nextheader++; 195686cdd19SJun-ichiro itojun Hagino return; 196686cdd19SJun-ichiro itojun Hagino case ICMP6_PARAMPROB_OPTION: 197686cdd19SJun-ichiro itojun Hagino stat->icp6errs_paramprob_option++; 198686cdd19SJun-ichiro itojun Hagino return; 199686cdd19SJun-ichiro itojun Hagino } 200686cdd19SJun-ichiro itojun Hagino break; 201686cdd19SJun-ichiro itojun Hagino case ND_REDIRECT: 202686cdd19SJun-ichiro itojun Hagino stat->icp6errs_redirect++; 203686cdd19SJun-ichiro itojun Hagino return; 204686cdd19SJun-ichiro itojun Hagino } 205686cdd19SJun-ichiro itojun Hagino stat->icp6errs_unknown++; 206686cdd19SJun-ichiro itojun Hagino } 207686cdd19SJun-ichiro itojun Hagino 20882cd038dSYoshinobu Inoue /* 209a1f7e5f8SHajimu UMEMOTO * A wrapper function for icmp6_error() necessary when the erroneous packet 210a1f7e5f8SHajimu UMEMOTO * may not contain enough scope zone information. 211a1f7e5f8SHajimu UMEMOTO */ 212a1f7e5f8SHajimu UMEMOTO void 2131272577eSXin LI icmp6_error2(struct mbuf *m, int type, int code, int param, 2141272577eSXin LI struct ifnet *ifp) 215a1f7e5f8SHajimu UMEMOTO { 2168b615593SMarko Zec INIT_VNET_INET6(curvnet); 217a1f7e5f8SHajimu UMEMOTO struct ip6_hdr *ip6; 218a1f7e5f8SHajimu UMEMOTO 219a1f7e5f8SHajimu UMEMOTO if (ifp == NULL) 220a1f7e5f8SHajimu UMEMOTO return; 221a1f7e5f8SHajimu UMEMOTO 222a1f7e5f8SHajimu UMEMOTO #ifndef PULLDOWN_TEST 223a1f7e5f8SHajimu UMEMOTO IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 224a1f7e5f8SHajimu UMEMOTO #else 225a1f7e5f8SHajimu UMEMOTO if (m->m_len < sizeof(struct ip6_hdr)) { 226a1f7e5f8SHajimu UMEMOTO m = m_pullup(m, sizeof(struct ip6_hdr)); 227a1f7e5f8SHajimu UMEMOTO if (m == NULL) 228a1f7e5f8SHajimu UMEMOTO return; 229a1f7e5f8SHajimu UMEMOTO } 230a1f7e5f8SHajimu UMEMOTO #endif 231a1f7e5f8SHajimu UMEMOTO 232a1f7e5f8SHajimu UMEMOTO ip6 = mtod(m, struct ip6_hdr *); 233a1f7e5f8SHajimu UMEMOTO 234a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) 235a1f7e5f8SHajimu UMEMOTO return; 236a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 237a1f7e5f8SHajimu UMEMOTO return; 238a1f7e5f8SHajimu UMEMOTO 239a1f7e5f8SHajimu UMEMOTO icmp6_error(m, type, code, param); 240a1f7e5f8SHajimu UMEMOTO } 241a1f7e5f8SHajimu UMEMOTO 242a1f7e5f8SHajimu UMEMOTO /* 24382cd038dSYoshinobu Inoue * Generate an error packet of type error in response to bad IP6 packet. 24482cd038dSYoshinobu Inoue */ 24582cd038dSYoshinobu Inoue void 2461272577eSXin LI icmp6_error(struct mbuf *m, int type, int code, int param) 24782cd038dSYoshinobu Inoue { 2488b615593SMarko Zec INIT_VNET_INET6(curvnet); 24982cd038dSYoshinobu Inoue struct ip6_hdr *oip6, *nip6; 25082cd038dSYoshinobu Inoue struct icmp6_hdr *icmp6; 251686cdd19SJun-ichiro itojun Hagino u_int preplen; 25282cd038dSYoshinobu Inoue int off; 253686cdd19SJun-ichiro itojun Hagino int nxt; 25482cd038dSYoshinobu Inoue 255e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_error); 25682cd038dSYoshinobu Inoue 257686cdd19SJun-ichiro itojun Hagino /* count per-type-code statistics */ 258603724d3SBjoern A. Zeeb icmp6_errcount(&V_icmp6stat.icp6s_outerrhist, type, code); 25982cd038dSYoshinobu Inoue 260686cdd19SJun-ichiro itojun Hagino #ifdef M_DECRYPTED /*not openbsd*/ 261686cdd19SJun-ichiro itojun Hagino if (m->m_flags & M_DECRYPTED) { 262e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_canterror); 263686cdd19SJun-ichiro itojun Hagino goto freeit; 264686cdd19SJun-ichiro itojun Hagino } 265686cdd19SJun-ichiro itojun Hagino #endif 266686cdd19SJun-ichiro itojun Hagino 267686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 268686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 269686cdd19SJun-ichiro itojun Hagino #else 270686cdd19SJun-ichiro itojun Hagino if (m->m_len < sizeof(struct ip6_hdr)) { 271686cdd19SJun-ichiro itojun Hagino m = m_pullup(m, sizeof(struct ip6_hdr)); 272686cdd19SJun-ichiro itojun Hagino if (m == NULL) 273686cdd19SJun-ichiro itojun Hagino return; 274686cdd19SJun-ichiro itojun Hagino } 275686cdd19SJun-ichiro itojun Hagino #endif 27682cd038dSYoshinobu Inoue oip6 = mtod(m, struct ip6_hdr *); 27782cd038dSYoshinobu Inoue 27882cd038dSYoshinobu Inoue /* 279f95d4633SHajimu UMEMOTO * If the destination address of the erroneous packet is a multicast 280f95d4633SHajimu UMEMOTO * address, or the packet was sent using link-layer multicast, 281f95d4633SHajimu UMEMOTO * we should basically suppress sending an error (RFC 2463, Section 282f95d4633SHajimu UMEMOTO * 2.4). 283f95d4633SHajimu UMEMOTO * We have two exceptions (the item e.2 in that section): 284f95d4633SHajimu UMEMOTO * - the Pakcet Too Big message can be sent for path MTU discovery. 285f95d4633SHajimu UMEMOTO * - the Parameter Problem Message that can be allowed an icmp6 error 286f95d4633SHajimu UMEMOTO * in the option type field. This check has been done in 287f95d4633SHajimu UMEMOTO * ip6_unknown_opt(), so we can just check the type and code. 28882cd038dSYoshinobu Inoue */ 28982cd038dSYoshinobu Inoue if ((m->m_flags & (M_BCAST|M_MCAST) || 29082cd038dSYoshinobu Inoue IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 29182cd038dSYoshinobu Inoue (type != ICMP6_PACKET_TOO_BIG && 29282cd038dSYoshinobu Inoue (type != ICMP6_PARAM_PROB || 29382cd038dSYoshinobu Inoue code != ICMP6_PARAMPROB_OPTION))) 29482cd038dSYoshinobu Inoue goto freeit; 29582cd038dSYoshinobu Inoue 296f95d4633SHajimu UMEMOTO /* 297f95d4633SHajimu UMEMOTO * RFC 2463, 2.4 (e.5): source address check. 298f95d4633SHajimu UMEMOTO * XXX: the case of anycast source? 299f95d4633SHajimu UMEMOTO */ 30082cd038dSYoshinobu Inoue if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 30182cd038dSYoshinobu Inoue IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 30282cd038dSYoshinobu Inoue goto freeit; 30382cd038dSYoshinobu Inoue 30482cd038dSYoshinobu Inoue /* 305686cdd19SJun-ichiro itojun Hagino * If we are about to send ICMPv6 against ICMPv6 error/redirect, 306686cdd19SJun-ichiro itojun Hagino * don't do it. 30782cd038dSYoshinobu Inoue */ 308686cdd19SJun-ichiro itojun Hagino nxt = -1; 309686cdd19SJun-ichiro itojun Hagino off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 310686cdd19SJun-ichiro itojun Hagino if (off >= 0 && nxt == IPPROTO_ICMPV6) { 31182cd038dSYoshinobu Inoue struct icmp6_hdr *icp; 31282cd038dSYoshinobu Inoue 313686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 31482cd038dSYoshinobu Inoue IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), ); 31582cd038dSYoshinobu Inoue icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 316686cdd19SJun-ichiro itojun Hagino #else 317686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 318686cdd19SJun-ichiro itojun Hagino sizeof(*icp)); 319686cdd19SJun-ichiro itojun Hagino if (icp == NULL) { 320e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 321686cdd19SJun-ichiro itojun Hagino return; 322686cdd19SJun-ichiro itojun Hagino } 323686cdd19SJun-ichiro itojun Hagino #endif 324686cdd19SJun-ichiro itojun Hagino if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 325686cdd19SJun-ichiro itojun Hagino icp->icmp6_type == ND_REDIRECT) { 32682cd038dSYoshinobu Inoue /* 32782cd038dSYoshinobu Inoue * ICMPv6 error 32882cd038dSYoshinobu Inoue * Special case: for redirect (which is 32982cd038dSYoshinobu Inoue * informational) we must not send icmp6 error. 33082cd038dSYoshinobu Inoue */ 331e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_canterror); 33282cd038dSYoshinobu Inoue goto freeit; 33382cd038dSYoshinobu Inoue } else { 334686cdd19SJun-ichiro itojun Hagino /* ICMPv6 informational - send the error */ 33582cd038dSYoshinobu Inoue } 336686cdd19SJun-ichiro itojun Hagino } else { 337686cdd19SJun-ichiro itojun Hagino /* non-ICMPv6 - send the error */ 33882cd038dSYoshinobu Inoue } 33982cd038dSYoshinobu Inoue 34082cd038dSYoshinobu Inoue oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 34182cd038dSYoshinobu Inoue 34282cd038dSYoshinobu Inoue /* Finally, do rate limitation check. */ 34382cd038dSYoshinobu Inoue if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 344e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_toofreq); 34582cd038dSYoshinobu Inoue goto freeit; 34682cd038dSYoshinobu Inoue } 34782cd038dSYoshinobu Inoue 34882cd038dSYoshinobu Inoue /* 34982cd038dSYoshinobu Inoue * OK, ICMP6 can be generated. 35082cd038dSYoshinobu Inoue */ 35182cd038dSYoshinobu Inoue 35282cd038dSYoshinobu Inoue if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 35382cd038dSYoshinobu Inoue m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 35482cd038dSYoshinobu Inoue 355686cdd19SJun-ichiro itojun Hagino preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 356a163d034SWarner Losh M_PREPEND(m, preplen, M_DONTWAIT); 357686cdd19SJun-ichiro itojun Hagino if (m && m->m_len < preplen) 358686cdd19SJun-ichiro itojun Hagino m = m_pullup(m, preplen); 35982cd038dSYoshinobu Inoue if (m == NULL) { 36033841545SHajimu UMEMOTO nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__)); 36182cd038dSYoshinobu Inoue return; 36282cd038dSYoshinobu Inoue } 36382cd038dSYoshinobu Inoue 36482cd038dSYoshinobu Inoue nip6 = mtod(m, struct ip6_hdr *); 36582cd038dSYoshinobu Inoue nip6->ip6_src = oip6->ip6_src; 36682cd038dSYoshinobu Inoue nip6->ip6_dst = oip6->ip6_dst; 36782cd038dSYoshinobu Inoue 3689a4f9608SHajimu UMEMOTO in6_clearscope(&oip6->ip6_src); 3699a4f9608SHajimu UMEMOTO in6_clearscope(&oip6->ip6_dst); 37082cd038dSYoshinobu Inoue 37182cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)(nip6 + 1); 37282cd038dSYoshinobu Inoue icmp6->icmp6_type = type; 37382cd038dSYoshinobu Inoue icmp6->icmp6_code = code; 37482cd038dSYoshinobu Inoue icmp6->icmp6_pptr = htonl((u_int32_t)param); 37582cd038dSYoshinobu Inoue 37633841545SHajimu UMEMOTO /* 37733841545SHajimu UMEMOTO * icmp6_reflect() is designed to be in the input path. 378cd0fdcf7SHajimu UMEMOTO * icmp6_error() can be called from both input and output path, 37933841545SHajimu UMEMOTO * and if we are in output path rcvif could contain bogus value. 38033841545SHajimu UMEMOTO * clear m->m_pkthdr.rcvif for safety, we should have enough scope 38133841545SHajimu UMEMOTO * information in ip header (nip6). 38233841545SHajimu UMEMOTO */ 38333841545SHajimu UMEMOTO m->m_pkthdr.rcvif = NULL; 38433841545SHajimu UMEMOTO 385e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_outhist[type]); 38682cd038dSYoshinobu Inoue icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 387686cdd19SJun-ichiro itojun Hagino 388686cdd19SJun-ichiro itojun Hagino return; 389686cdd19SJun-ichiro itojun Hagino 390686cdd19SJun-ichiro itojun Hagino freeit: 391686cdd19SJun-ichiro itojun Hagino /* 392cd0fdcf7SHajimu UMEMOTO * If we can't tell whether or not we can generate ICMP6, free it. 393686cdd19SJun-ichiro itojun Hagino */ 394686cdd19SJun-ichiro itojun Hagino m_freem(m); 39582cd038dSYoshinobu Inoue } 39682cd038dSYoshinobu Inoue 39782cd038dSYoshinobu Inoue /* 39882cd038dSYoshinobu Inoue * Process a received ICMP6 message. 39982cd038dSYoshinobu Inoue */ 40082cd038dSYoshinobu Inoue int 4011272577eSXin LI icmp6_input(struct mbuf **mp, int *offp, int proto) 40282cd038dSYoshinobu Inoue { 4038b615593SMarko Zec INIT_VNET_INET6(curvnet); 40482cd038dSYoshinobu Inoue struct mbuf *m = *mp, *n; 40529dc7bc6SBruce M Simpson struct ifnet *ifp; 40682cd038dSYoshinobu Inoue struct ip6_hdr *ip6, *nip6; 40782cd038dSYoshinobu Inoue struct icmp6_hdr *icmp6, *nicmp6; 40882cd038dSYoshinobu Inoue int off = *offp; 40982cd038dSYoshinobu Inoue int icmp6len = m->m_pkthdr.len - *offp; 41082cd038dSYoshinobu Inoue int code, sum, noff; 4111d54aa3bSBjoern A. Zeeb char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 41282cd038dSYoshinobu Inoue 41329dc7bc6SBruce M Simpson ifp = m->m_pkthdr.rcvif; 41429dc7bc6SBruce M Simpson 415686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 41682cd038dSYoshinobu Inoue IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE); 41782cd038dSYoshinobu Inoue /* m might change if M_LOOP. So, call mtod after this */ 418686cdd19SJun-ichiro itojun Hagino #endif 41982cd038dSYoshinobu Inoue 42082cd038dSYoshinobu Inoue /* 42182cd038dSYoshinobu Inoue * Locate icmp6 structure in mbuf, and check 42282cd038dSYoshinobu Inoue * that not corrupted and of at least minimum length 42382cd038dSYoshinobu Inoue */ 42482cd038dSYoshinobu Inoue 42582cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 42682cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct icmp6_hdr)) { 427e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 42882cd038dSYoshinobu Inoue goto freeit; 42982cd038dSYoshinobu Inoue } 43082cd038dSYoshinobu Inoue 43182cd038dSYoshinobu Inoue /* 43233cde130SBruce M Simpson * Check multicast group membership. 43333cde130SBruce M Simpson * Note: SSM filters are not applied for ICMPv6 traffic. 43433cde130SBruce M Simpson */ 43533cde130SBruce M Simpson if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 43633cde130SBruce M Simpson struct in6_multi *inm; 43733cde130SBruce M Simpson 43833cde130SBruce M Simpson inm = in6m_lookup(ifp, &ip6->ip6_dst); 43933cde130SBruce M Simpson if (inm == NULL) { 44033cde130SBruce M Simpson IP6STAT_INC(ip6s_notmember); 44133cde130SBruce M Simpson in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 44233cde130SBruce M Simpson goto freeit; 44333cde130SBruce M Simpson } 44433cde130SBruce M Simpson } 44533cde130SBruce M Simpson 44633cde130SBruce M Simpson /* 44782cd038dSYoshinobu Inoue * calculate the checksum 44882cd038dSYoshinobu Inoue */ 449686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 45082cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 451686cdd19SJun-ichiro itojun Hagino #else 452686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 453686cdd19SJun-ichiro itojun Hagino if (icmp6 == NULL) { 454e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 455686cdd19SJun-ichiro itojun Hagino return IPPROTO_DONE; 456686cdd19SJun-ichiro itojun Hagino } 457686cdd19SJun-ichiro itojun Hagino #endif 45882cd038dSYoshinobu Inoue code = icmp6->icmp6_code; 45982cd038dSYoshinobu Inoue 46082cd038dSYoshinobu Inoue if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 46133841545SHajimu UMEMOTO nd6log((LOG_ERR, 46282cd038dSYoshinobu Inoue "ICMP6 checksum error(%d|%x) %s\n", 4631d54aa3bSBjoern A. Zeeb icmp6->icmp6_type, sum, 4641d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6bufs, &ip6->ip6_src))); 465e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_checksum); 46682cd038dSYoshinobu Inoue goto freeit; 46782cd038dSYoshinobu Inoue } 46882cd038dSYoshinobu Inoue 4699494d596SBrooks Davis if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 47082cd038dSYoshinobu Inoue /* 47182cd038dSYoshinobu Inoue * Deliver very specific ICMP6 type only. 472cd0fdcf7SHajimu UMEMOTO * This is important to deliver TOOBIG. Otherwise PMTUD 47382cd038dSYoshinobu Inoue * will not work. 47482cd038dSYoshinobu Inoue */ 47582cd038dSYoshinobu Inoue switch (icmp6->icmp6_type) { 47682cd038dSYoshinobu Inoue case ICMP6_DST_UNREACH: 47782cd038dSYoshinobu Inoue case ICMP6_PACKET_TOO_BIG: 47882cd038dSYoshinobu Inoue case ICMP6_TIME_EXCEEDED: 47982cd038dSYoshinobu Inoue break; 48082cd038dSYoshinobu Inoue default: 48182cd038dSYoshinobu Inoue goto freeit; 48282cd038dSYoshinobu Inoue } 48382cd038dSYoshinobu Inoue } 48482cd038dSYoshinobu Inoue 485e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_inhist[icmp6->icmp6_type]); 48629dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_msg); 48782cd038dSYoshinobu Inoue if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 48829dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_error); 48982cd038dSYoshinobu Inoue 49082cd038dSYoshinobu Inoue switch (icmp6->icmp6_type) { 49182cd038dSYoshinobu Inoue case ICMP6_DST_UNREACH: 49229dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_dstunreach); 49382cd038dSYoshinobu Inoue switch (code) { 49482cd038dSYoshinobu Inoue case ICMP6_DST_UNREACH_NOROUTE: 49582cd038dSYoshinobu Inoue code = PRC_UNREACH_NET; 49682cd038dSYoshinobu Inoue break; 49782cd038dSYoshinobu Inoue case ICMP6_DST_UNREACH_ADMIN: 49829dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_adminprohib); 499686cdd19SJun-ichiro itojun Hagino code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 50082cd038dSYoshinobu Inoue break; 501686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_ADDR: 502686cdd19SJun-ichiro itojun Hagino code = PRC_HOSTDEAD; 503686cdd19SJun-ichiro itojun Hagino break; 504686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_BEYONDSCOPE: 505686cdd19SJun-ichiro itojun Hagino /* I mean "source address was incorrect." */ 506686cdd19SJun-ichiro itojun Hagino code = PRC_PARAMPROB; 507686cdd19SJun-ichiro itojun Hagino break; 50882cd038dSYoshinobu Inoue case ICMP6_DST_UNREACH_NOPORT: 50982cd038dSYoshinobu Inoue code = PRC_UNREACH_PORT; 51082cd038dSYoshinobu Inoue break; 51182cd038dSYoshinobu Inoue default: 51282cd038dSYoshinobu Inoue goto badcode; 51382cd038dSYoshinobu Inoue } 51482cd038dSYoshinobu Inoue goto deliver; 51582cd038dSYoshinobu Inoue break; 51682cd038dSYoshinobu Inoue 51782cd038dSYoshinobu Inoue case ICMP6_PACKET_TOO_BIG: 51829dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_pkttoobig); 51982cd038dSYoshinobu Inoue 520aaff9927SHajimu UMEMOTO /* validation is made in icmp6_mtudisc_update */ 521aaff9927SHajimu UMEMOTO 52282cd038dSYoshinobu Inoue code = PRC_MSGSIZE; 52382cd038dSYoshinobu Inoue 524686cdd19SJun-ichiro itojun Hagino /* 525686cdd19SJun-ichiro itojun Hagino * Updating the path MTU will be done after examining 526686cdd19SJun-ichiro itojun Hagino * intermediate extension headers. 527686cdd19SJun-ichiro itojun Hagino */ 52882cd038dSYoshinobu Inoue goto deliver; 52982cd038dSYoshinobu Inoue break; 53082cd038dSYoshinobu Inoue 53182cd038dSYoshinobu Inoue case ICMP6_TIME_EXCEEDED: 53229dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_timeexceed); 53382cd038dSYoshinobu Inoue switch (code) { 53482cd038dSYoshinobu Inoue case ICMP6_TIME_EXCEED_TRANSIT: 5352ce62dceSSUZUKI Shinsuke code = PRC_TIMXCEED_INTRANS; 5362ce62dceSSUZUKI Shinsuke break; 53782cd038dSYoshinobu Inoue case ICMP6_TIME_EXCEED_REASSEMBLY: 5382ce62dceSSUZUKI Shinsuke code = PRC_TIMXCEED_REASS; 53982cd038dSYoshinobu Inoue break; 54082cd038dSYoshinobu Inoue default: 54182cd038dSYoshinobu Inoue goto badcode; 54282cd038dSYoshinobu Inoue } 54382cd038dSYoshinobu Inoue goto deliver; 54482cd038dSYoshinobu Inoue break; 54582cd038dSYoshinobu Inoue 54682cd038dSYoshinobu Inoue case ICMP6_PARAM_PROB: 54729dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_paramprob); 54882cd038dSYoshinobu Inoue switch (code) { 54982cd038dSYoshinobu Inoue case ICMP6_PARAMPROB_NEXTHEADER: 55082cd038dSYoshinobu Inoue code = PRC_UNREACH_PROTOCOL; 55182cd038dSYoshinobu Inoue break; 55282cd038dSYoshinobu Inoue case ICMP6_PARAMPROB_HEADER: 55382cd038dSYoshinobu Inoue case ICMP6_PARAMPROB_OPTION: 55482cd038dSYoshinobu Inoue code = PRC_PARAMPROB; 55582cd038dSYoshinobu Inoue break; 55682cd038dSYoshinobu Inoue default: 55782cd038dSYoshinobu Inoue goto badcode; 55882cd038dSYoshinobu Inoue } 55982cd038dSYoshinobu Inoue goto deliver; 56082cd038dSYoshinobu Inoue break; 56182cd038dSYoshinobu Inoue 56282cd038dSYoshinobu Inoue case ICMP6_ECHO_REQUEST: 56329dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_echo); 56482cd038dSYoshinobu Inoue if (code != 0) 56582cd038dSYoshinobu Inoue goto badcode; 56682cd038dSYoshinobu Inoue if ((n = m_copy(m, 0, M_COPYALL)) == NULL) { 56782cd038dSYoshinobu Inoue /* Give up remote */ 56882cd038dSYoshinobu Inoue break; 56982cd038dSYoshinobu Inoue } 570686cdd19SJun-ichiro itojun Hagino if ((n->m_flags & M_EXT) != 0 571686cdd19SJun-ichiro itojun Hagino || n->m_len < off + sizeof(struct icmp6_hdr)) { 57282cd038dSYoshinobu Inoue struct mbuf *n0 = n; 573686cdd19SJun-ichiro itojun Hagino const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 5742268ca47SSam Leffler int n0len; 57582cd038dSYoshinobu Inoue 576a163d034SWarner Losh MGETHDR(n, M_DONTWAIT, n0->m_type); 5775c47350dSSam Leffler n0len = n0->m_pkthdr.len; /* save for use below */ 5785c47350dSSam Leffler if (n) 5795c47350dSSam Leffler M_MOVE_PKTHDR(n, n0); 580686cdd19SJun-ichiro itojun Hagino if (n && maxlen >= MHLEN) { 581a163d034SWarner Losh MCLGET(n, M_DONTWAIT); 582686cdd19SJun-ichiro itojun Hagino if ((n->m_flags & M_EXT) == 0) { 583686cdd19SJun-ichiro itojun Hagino m_free(n); 584686cdd19SJun-ichiro itojun Hagino n = NULL; 585686cdd19SJun-ichiro itojun Hagino } 586686cdd19SJun-ichiro itojun Hagino } 58782cd038dSYoshinobu Inoue if (n == NULL) { 58882cd038dSYoshinobu Inoue /* Give up remote */ 58982cd038dSYoshinobu Inoue m_freem(n0); 59082cd038dSYoshinobu Inoue break; 59182cd038dSYoshinobu Inoue } 59282cd038dSYoshinobu Inoue /* 59382cd038dSYoshinobu Inoue * Copy IPv6 and ICMPv6 only. 59482cd038dSYoshinobu Inoue */ 59582cd038dSYoshinobu Inoue nip6 = mtod(n, struct ip6_hdr *); 59682cd038dSYoshinobu Inoue bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 59782cd038dSYoshinobu Inoue nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 59882cd038dSYoshinobu Inoue bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 59982cd038dSYoshinobu Inoue noff = sizeof(struct ip6_hdr); 6002268ca47SSam Leffler /* new mbuf contains only ipv6+icmpv6 headers */ 6012268ca47SSam Leffler n->m_len = noff + sizeof(struct icmp6_hdr); 602686cdd19SJun-ichiro itojun Hagino /* 603686cdd19SJun-ichiro itojun Hagino * Adjust mbuf. ip6_plen will be adjusted in 604686cdd19SJun-ichiro itojun Hagino * ip6_output(). 605686cdd19SJun-ichiro itojun Hagino */ 606686cdd19SJun-ichiro itojun Hagino m_adj(n0, off + sizeof(struct icmp6_hdr)); 6072268ca47SSam Leffler /* recalculate complete packet size */ 6082268ca47SSam Leffler n->m_pkthdr.len = n0len + (noff - off); 609686cdd19SJun-ichiro itojun Hagino n->m_next = n0; 61082cd038dSYoshinobu Inoue } else { 61182cd038dSYoshinobu Inoue nip6 = mtod(n, struct ip6_hdr *); 6126a550ab3SHajimu UMEMOTO IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 6136a550ab3SHajimu UMEMOTO sizeof(*nicmp6)); 61482cd038dSYoshinobu Inoue noff = off; 61582cd038dSYoshinobu Inoue } 61682cd038dSYoshinobu Inoue nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 61782cd038dSYoshinobu Inoue nicmp6->icmp6_code = 0; 61882cd038dSYoshinobu Inoue if (n) { 619e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_reflect); 620e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_outhist[ICMP6_ECHO_REPLY]); 62182cd038dSYoshinobu Inoue icmp6_reflect(n, noff); 62282cd038dSYoshinobu Inoue } 62382cd038dSYoshinobu Inoue break; 62482cd038dSYoshinobu Inoue 62582cd038dSYoshinobu Inoue case ICMP6_ECHO_REPLY: 62629dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_echoreply); 62782cd038dSYoshinobu Inoue if (code != 0) 62882cd038dSYoshinobu Inoue goto badcode; 62982cd038dSYoshinobu Inoue break; 63082cd038dSYoshinobu Inoue 63181170631SHajimu UMEMOTO case MLD_LISTENER_QUERY: 63281170631SHajimu UMEMOTO case MLD_LISTENER_REPORT: 63333cde130SBruce M Simpson case MLD_LISTENER_DONE: 63433cde130SBruce M Simpson case MLDV2_LISTENER_REPORT: 63533cde130SBruce M Simpson /* 63629dc7bc6SBruce M Simpson * Drop MLD traffic which is not link-local, has a hop limit 63729dc7bc6SBruce M Simpson * of greater than 1 hop, or which does not have the 63829dc7bc6SBruce M Simpson * IPv6 HBH Router Alert option. 63929dc7bc6SBruce M Simpson * As IPv6 HBH options are stripped in ip6_input() we must 64029dc7bc6SBruce M Simpson * check an mbuf header flag. 64133cde130SBruce M Simpson * XXX Should we also sanity check that these messages 64233cde130SBruce M Simpson * were directed to a link-local multicast prefix? 64333cde130SBruce M Simpson */ 64429dc7bc6SBruce M Simpson if ((ip6->ip6_hlim != 1) || (m->m_flags & M_RTALERT_MLD) == 0) 645686cdd19SJun-ichiro itojun Hagino goto freeit; 64633cde130SBruce M Simpson if (mld_input(m, off, icmp6len) != 0) 64733cde130SBruce M Simpson return (IPPROTO_DONE); 64882cd038dSYoshinobu Inoue /* m stays. */ 64982cd038dSYoshinobu Inoue break; 65082cd038dSYoshinobu Inoue 65182cd038dSYoshinobu Inoue case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 65282cd038dSYoshinobu Inoue { 65382cd038dSYoshinobu Inoue enum { WRU, FQDN } mode; 65482cd038dSYoshinobu Inoue 655603724d3SBjoern A. Zeeb if (!V_icmp6_nodeinfo) 656686cdd19SJun-ichiro itojun Hagino break; 657686cdd19SJun-ichiro itojun Hagino 65882cd038dSYoshinobu Inoue if (icmp6len == sizeof(struct icmp6_hdr) + 4) 65982cd038dSYoshinobu Inoue mode = WRU; 660686cdd19SJun-ichiro itojun Hagino else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 66182cd038dSYoshinobu Inoue mode = FQDN; 66282cd038dSYoshinobu Inoue else 66382cd038dSYoshinobu Inoue goto badlen; 66482cd038dSYoshinobu Inoue 66582cd038dSYoshinobu Inoue if (mode == FQDN) { 666686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 66782cd038dSYoshinobu Inoue IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), 66882cd038dSYoshinobu Inoue IPPROTO_DONE); 669686cdd19SJun-ichiro itojun Hagino #endif 670686cdd19SJun-ichiro itojun Hagino n = m_copy(m, 0, M_COPYALL); 671686cdd19SJun-ichiro itojun Hagino if (n) 672686cdd19SJun-ichiro itojun Hagino n = ni6_input(n, off); 673686cdd19SJun-ichiro itojun Hagino /* XXX meaningless if n == NULL */ 67482cd038dSYoshinobu Inoue noff = sizeof(struct ip6_hdr); 67582cd038dSYoshinobu Inoue } else { 67676ca6f88SJamie Gritton struct prison *pr; 67782cd038dSYoshinobu Inoue u_char *p; 67876ca6f88SJamie Gritton int maxlen, maxhlen, hlen; 67982cd038dSYoshinobu Inoue 68018706985SJINMEI Tatuya /* 68118706985SJINMEI Tatuya * XXX: this combination of flags is pointless, 68218706985SJINMEI Tatuya * but should we keep this for compatibility? 68318706985SJINMEI Tatuya */ 684603724d3SBjoern A. Zeeb if ((V_icmp6_nodeinfo & 5) != 5) 68533841545SHajimu UMEMOTO break; 68633841545SHajimu UMEMOTO 687686cdd19SJun-ichiro itojun Hagino if (code != 0) 688686cdd19SJun-ichiro itojun Hagino goto badcode; 689686cdd19SJun-ichiro itojun Hagino maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 690686cdd19SJun-ichiro itojun Hagino if (maxlen >= MCLBYTES) { 691686cdd19SJun-ichiro itojun Hagino /* Give up remote */ 692686cdd19SJun-ichiro itojun Hagino break; 693686cdd19SJun-ichiro itojun Hagino } 694a163d034SWarner Losh MGETHDR(n, M_DONTWAIT, m->m_type); 695686cdd19SJun-ichiro itojun Hagino if (n && maxlen > MHLEN) { 696a163d034SWarner Losh MCLGET(n, M_DONTWAIT); 697686cdd19SJun-ichiro itojun Hagino if ((n->m_flags & M_EXT) == 0) { 698686cdd19SJun-ichiro itojun Hagino m_free(n); 699686cdd19SJun-ichiro itojun Hagino n = NULL; 700686cdd19SJun-ichiro itojun Hagino } 701686cdd19SJun-ichiro itojun Hagino } 70231a94603SBruce M Simpson if (n && !m_dup_pkthdr(n, m, M_DONTWAIT)) { 7039967cafcSSam Leffler /* 7049967cafcSSam Leffler * Previous code did a blind M_COPY_PKTHDR 7059967cafcSSam Leffler * and said "just for rcvif". If true, then 7069967cafcSSam Leffler * we could tolerate the dup failing (due to 7079967cafcSSam Leffler * the deep copy of the tag chain). For now 7089967cafcSSam Leffler * be conservative and just fail. 7099967cafcSSam Leffler */ 7109967cafcSSam Leffler m_free(n); 7119967cafcSSam Leffler n = NULL; 7129967cafcSSam Leffler } 71382cd038dSYoshinobu Inoue if (n == NULL) { 71482cd038dSYoshinobu Inoue /* Give up remote */ 71582cd038dSYoshinobu Inoue break; 71682cd038dSYoshinobu Inoue } 71733841545SHajimu UMEMOTO n->m_pkthdr.rcvif = NULL; 718686cdd19SJun-ichiro itojun Hagino n->m_len = 0; 719686cdd19SJun-ichiro itojun Hagino maxhlen = M_TRAILINGSPACE(n) - maxlen; 72076ca6f88SJamie Gritton pr = curthread->td_ucred->cr_prison; 72176ca6f88SJamie Gritton mtx_lock(&pr->pr_mtx); 722c1f19219SJamie Gritton hlen = strlen(pr->pr_hostname); 72376ca6f88SJamie Gritton if (maxhlen > hlen) 72476ca6f88SJamie Gritton maxhlen = hlen; 72582cd038dSYoshinobu Inoue /* 72682cd038dSYoshinobu Inoue * Copy IPv6 and ICMPv6 only. 72782cd038dSYoshinobu Inoue */ 72882cd038dSYoshinobu Inoue nip6 = mtod(n, struct ip6_hdr *); 72982cd038dSYoshinobu Inoue bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 73082cd038dSYoshinobu Inoue nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 73182cd038dSYoshinobu Inoue bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 73282cd038dSYoshinobu Inoue p = (u_char *)(nicmp6 + 1); 73382cd038dSYoshinobu Inoue bzero(p, 4); 734c1f19219SJamie Gritton /* meaningless TTL */ 735c1f19219SJamie Gritton bcopy(pr->pr_hostname, p + 4, maxhlen); 73676ca6f88SJamie Gritton mtx_unlock(&pr->pr_mtx); 73782cd038dSYoshinobu Inoue noff = sizeof(struct ip6_hdr); 73882cd038dSYoshinobu Inoue n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 739686cdd19SJun-ichiro itojun Hagino sizeof(struct icmp6_hdr) + 4 + maxhlen; 74082cd038dSYoshinobu Inoue nicmp6->icmp6_type = ICMP6_WRUREPLY; 74182cd038dSYoshinobu Inoue nicmp6->icmp6_code = 0; 74282cd038dSYoshinobu Inoue } 74382cd038dSYoshinobu Inoue if (n) { 744e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_reflect); 745e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_outhist[ICMP6_WRUREPLY]); 74682cd038dSYoshinobu Inoue icmp6_reflect(n, noff); 74782cd038dSYoshinobu Inoue } 74882cd038dSYoshinobu Inoue break; 74982cd038dSYoshinobu Inoue } 75082cd038dSYoshinobu Inoue 75182cd038dSYoshinobu Inoue case ICMP6_WRUREPLY: 75282cd038dSYoshinobu Inoue if (code != 0) 75382cd038dSYoshinobu Inoue goto badcode; 75482cd038dSYoshinobu Inoue break; 75582cd038dSYoshinobu Inoue 75682cd038dSYoshinobu Inoue case ND_ROUTER_SOLICIT: 75729dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_routersolicit); 75882cd038dSYoshinobu Inoue if (code != 0) 75982cd038dSYoshinobu Inoue goto badcode; 76082cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_router_solicit)) 76182cd038dSYoshinobu Inoue goto badlen; 762a163d034SWarner Losh if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 763686cdd19SJun-ichiro itojun Hagino /* give up local */ 76482cd038dSYoshinobu Inoue nd6_rs_input(m, off, icmp6len); 765686cdd19SJun-ichiro itojun Hagino m = NULL; 766686cdd19SJun-ichiro itojun Hagino goto freeit; 767686cdd19SJun-ichiro itojun Hagino } 768686cdd19SJun-ichiro itojun Hagino nd6_rs_input(n, off, icmp6len); 76982cd038dSYoshinobu Inoue /* m stays. */ 77082cd038dSYoshinobu Inoue break; 77182cd038dSYoshinobu Inoue 77282cd038dSYoshinobu Inoue case ND_ROUTER_ADVERT: 77329dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_routeradvert); 77482cd038dSYoshinobu Inoue if (code != 0) 77582cd038dSYoshinobu Inoue goto badcode; 77682cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_router_advert)) 77782cd038dSYoshinobu Inoue goto badlen; 778a163d034SWarner Losh if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 779686cdd19SJun-ichiro itojun Hagino /* give up local */ 78082cd038dSYoshinobu Inoue nd6_ra_input(m, off, icmp6len); 781686cdd19SJun-ichiro itojun Hagino m = NULL; 782686cdd19SJun-ichiro itojun Hagino goto freeit; 783686cdd19SJun-ichiro itojun Hagino } 784686cdd19SJun-ichiro itojun Hagino nd6_ra_input(n, off, icmp6len); 78582cd038dSYoshinobu Inoue /* m stays. */ 78682cd038dSYoshinobu Inoue break; 78782cd038dSYoshinobu Inoue 78882cd038dSYoshinobu Inoue case ND_NEIGHBOR_SOLICIT: 78929dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_neighborsolicit); 79082cd038dSYoshinobu Inoue if (code != 0) 79182cd038dSYoshinobu Inoue goto badcode; 79282cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_neighbor_solicit)) 79382cd038dSYoshinobu Inoue goto badlen; 794a163d034SWarner Losh if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 795686cdd19SJun-ichiro itojun Hagino /* give up local */ 79682cd038dSYoshinobu Inoue nd6_ns_input(m, off, icmp6len); 797686cdd19SJun-ichiro itojun Hagino m = NULL; 798686cdd19SJun-ichiro itojun Hagino goto freeit; 799686cdd19SJun-ichiro itojun Hagino } 800686cdd19SJun-ichiro itojun Hagino nd6_ns_input(n, off, icmp6len); 80182cd038dSYoshinobu Inoue /* m stays. */ 80282cd038dSYoshinobu Inoue break; 80382cd038dSYoshinobu Inoue 80482cd038dSYoshinobu Inoue case ND_NEIGHBOR_ADVERT: 80529dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_neighboradvert); 80682cd038dSYoshinobu Inoue if (code != 0) 80782cd038dSYoshinobu Inoue goto badcode; 80882cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_neighbor_advert)) 80982cd038dSYoshinobu Inoue goto badlen; 810a163d034SWarner Losh if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 811686cdd19SJun-ichiro itojun Hagino /* give up local */ 81282cd038dSYoshinobu Inoue nd6_na_input(m, off, icmp6len); 813686cdd19SJun-ichiro itojun Hagino m = NULL; 814686cdd19SJun-ichiro itojun Hagino goto freeit; 815686cdd19SJun-ichiro itojun Hagino } 816686cdd19SJun-ichiro itojun Hagino nd6_na_input(n, off, icmp6len); 81782cd038dSYoshinobu Inoue /* m stays. */ 81882cd038dSYoshinobu Inoue break; 81982cd038dSYoshinobu Inoue 82082cd038dSYoshinobu Inoue case ND_REDIRECT: 82129dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_redirect); 82282cd038dSYoshinobu Inoue if (code != 0) 82382cd038dSYoshinobu Inoue goto badcode; 82482cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_redirect)) 82582cd038dSYoshinobu Inoue goto badlen; 826a163d034SWarner Losh if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 827686cdd19SJun-ichiro itojun Hagino /* give up local */ 82882cd038dSYoshinobu Inoue icmp6_redirect_input(m, off); 829686cdd19SJun-ichiro itojun Hagino m = NULL; 830686cdd19SJun-ichiro itojun Hagino goto freeit; 831686cdd19SJun-ichiro itojun Hagino } 832686cdd19SJun-ichiro itojun Hagino icmp6_redirect_input(n, off); 83382cd038dSYoshinobu Inoue /* m stays. */ 83482cd038dSYoshinobu Inoue break; 83582cd038dSYoshinobu Inoue 83682cd038dSYoshinobu Inoue case ICMP6_ROUTER_RENUMBERING: 83782cd038dSYoshinobu Inoue if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 83882cd038dSYoshinobu Inoue code != ICMP6_ROUTER_RENUMBERING_RESULT) 83982cd038dSYoshinobu Inoue goto badcode; 84082cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct icmp6_router_renum)) 84182cd038dSYoshinobu Inoue goto badlen; 84282cd038dSYoshinobu Inoue break; 84382cd038dSYoshinobu Inoue 84482cd038dSYoshinobu Inoue default: 84533841545SHajimu UMEMOTO nd6log((LOG_DEBUG, 84633841545SHajimu UMEMOTO "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 8471d54aa3bSBjoern A. Zeeb icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src), 8481d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6bufd, &ip6->ip6_dst), 84929dc7bc6SBruce M Simpson ifp ? ifp->if_index : 0)); 85082cd038dSYoshinobu Inoue if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 85182cd038dSYoshinobu Inoue /* ICMPv6 error: MUST deliver it by spec... */ 85282cd038dSYoshinobu Inoue code = PRC_NCMDS; 85382cd038dSYoshinobu Inoue /* deliver */ 85482cd038dSYoshinobu Inoue } else { 85582cd038dSYoshinobu Inoue /* ICMPv6 informational: MUST not deliver */ 85682cd038dSYoshinobu Inoue break; 85782cd038dSYoshinobu Inoue } 85882cd038dSYoshinobu Inoue deliver: 8599c0fda72SHajimu UMEMOTO if (icmp6_notify_error(&m, off, icmp6len, code)) { 86033841545SHajimu UMEMOTO /* In this case, m should've been freed. */ 86133841545SHajimu UMEMOTO return (IPPROTO_DONE); 86233841545SHajimu UMEMOTO } 86333841545SHajimu UMEMOTO break; 86433841545SHajimu UMEMOTO 86533841545SHajimu UMEMOTO badcode: 866e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_badcode); 86733841545SHajimu UMEMOTO break; 86833841545SHajimu UMEMOTO 86933841545SHajimu UMEMOTO badlen: 870e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_badlen); 87133841545SHajimu UMEMOTO break; 87233841545SHajimu UMEMOTO } 87333841545SHajimu UMEMOTO 87433841545SHajimu UMEMOTO /* deliver the packet to appropriate sockets */ 87533841545SHajimu UMEMOTO icmp6_rip6_input(&m, *offp); 87633841545SHajimu UMEMOTO 87733841545SHajimu UMEMOTO return IPPROTO_DONE; 87833841545SHajimu UMEMOTO 87933841545SHajimu UMEMOTO freeit: 88033841545SHajimu UMEMOTO m_freem(m); 88133841545SHajimu UMEMOTO return IPPROTO_DONE; 88233841545SHajimu UMEMOTO } 88333841545SHajimu UMEMOTO 88433841545SHajimu UMEMOTO static int 8851272577eSXin LI icmp6_notify_error(struct mbuf **mp, int off, int icmp6len, int code) 88633841545SHajimu UMEMOTO { 8878b615593SMarko Zec INIT_VNET_INET6(curvnet); 8889c0fda72SHajimu UMEMOTO struct mbuf *m = *mp; 88933841545SHajimu UMEMOTO struct icmp6_hdr *icmp6; 89033841545SHajimu UMEMOTO struct ip6_hdr *eip6; 89133841545SHajimu UMEMOTO u_int32_t notifymtu; 89233841545SHajimu UMEMOTO struct sockaddr_in6 icmp6src, icmp6dst; 89333841545SHajimu UMEMOTO 89482cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 895e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 89682cd038dSYoshinobu Inoue goto freeit; 89782cd038dSYoshinobu Inoue } 898686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 89982cd038dSYoshinobu Inoue IP6_EXTHDR_CHECK(m, off, 90006cd0a3fSHajimu UMEMOTO sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1); 90182cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 902686cdd19SJun-ichiro itojun Hagino #else 903686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 904686cdd19SJun-ichiro itojun Hagino sizeof(*icmp6) + sizeof(struct ip6_hdr)); 905686cdd19SJun-ichiro itojun Hagino if (icmp6 == NULL) { 906e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 90733841545SHajimu UMEMOTO return (-1); 908686cdd19SJun-ichiro itojun Hagino } 909686cdd19SJun-ichiro itojun Hagino #endif 91033841545SHajimu UMEMOTO eip6 = (struct ip6_hdr *)(icmp6 + 1); 91182cd038dSYoshinobu Inoue 91282cd038dSYoshinobu Inoue /* Detect the upper level protocol */ 91382cd038dSYoshinobu Inoue { 9149233d8f3SDavid E. O'Brien void (*ctlfunc)(int, struct sockaddr *, void *); 91582cd038dSYoshinobu Inoue u_int8_t nxt = eip6->ip6_nxt; 91682cd038dSYoshinobu Inoue int eoff = off + sizeof(struct icmp6_hdr) + 91782cd038dSYoshinobu Inoue sizeof(struct ip6_hdr); 91882cd038dSYoshinobu Inoue struct ip6ctlparam ip6cp; 919686cdd19SJun-ichiro itojun Hagino struct in6_addr *finaldst = NULL; 920686cdd19SJun-ichiro itojun Hagino int icmp6type = icmp6->icmp6_type; 921686cdd19SJun-ichiro itojun Hagino struct ip6_frag *fh; 922686cdd19SJun-ichiro itojun Hagino struct ip6_rthdr *rth; 923686cdd19SJun-ichiro itojun Hagino struct ip6_rthdr0 *rth0; 924686cdd19SJun-ichiro itojun Hagino int rthlen; 92582cd038dSYoshinobu Inoue 92688ff5695SSUZUKI Shinsuke while (1) { /* XXX: should avoid infinite loop explicitly? */ 92782cd038dSYoshinobu Inoue struct ip6_ext *eh; 92882cd038dSYoshinobu Inoue 92982cd038dSYoshinobu Inoue switch (nxt) { 93082cd038dSYoshinobu Inoue case IPPROTO_HOPOPTS: 93182cd038dSYoshinobu Inoue case IPPROTO_DSTOPTS: 93282cd038dSYoshinobu Inoue case IPPROTO_AH: 933686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 93406cd0a3fSHajimu UMEMOTO IP6_EXTHDR_CHECK(m, 0, 93506cd0a3fSHajimu UMEMOTO eoff + sizeof(struct ip6_ext), -1); 9360527d333SHajimu UMEMOTO eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff); 937686cdd19SJun-ichiro itojun Hagino #else 938686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 939686cdd19SJun-ichiro itojun Hagino eoff, sizeof(*eh)); 940686cdd19SJun-ichiro itojun Hagino if (eh == NULL) { 941e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 94233841545SHajimu UMEMOTO return (-1); 943686cdd19SJun-ichiro itojun Hagino } 944686cdd19SJun-ichiro itojun Hagino #endif 945686cdd19SJun-ichiro itojun Hagino 94682cd038dSYoshinobu Inoue if (nxt == IPPROTO_AH) 94782cd038dSYoshinobu Inoue eoff += (eh->ip6e_len + 2) << 2; 94882cd038dSYoshinobu Inoue else 94982cd038dSYoshinobu Inoue eoff += (eh->ip6e_len + 1) << 3; 95082cd038dSYoshinobu Inoue nxt = eh->ip6e_nxt; 95182cd038dSYoshinobu Inoue break; 952686cdd19SJun-ichiro itojun Hagino case IPPROTO_ROUTING: 953686cdd19SJun-ichiro itojun Hagino /* 954686cdd19SJun-ichiro itojun Hagino * When the erroneous packet contains a 955686cdd19SJun-ichiro itojun Hagino * routing header, we should examine the 956686cdd19SJun-ichiro itojun Hagino * header to determine the final destination. 957686cdd19SJun-ichiro itojun Hagino * Otherwise, we can't properly update 958686cdd19SJun-ichiro itojun Hagino * information that depends on the final 959686cdd19SJun-ichiro itojun Hagino * destination (e.g. path MTU). 960686cdd19SJun-ichiro itojun Hagino */ 961686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 96206cd0a3fSHajimu UMEMOTO IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1); 96306cd0a3fSHajimu UMEMOTO rth = (struct ip6_rthdr *) 96406cd0a3fSHajimu UMEMOTO (mtod(m, caddr_t) + eoff); 965686cdd19SJun-ichiro itojun Hagino #else 966686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 967686cdd19SJun-ichiro itojun Hagino eoff, sizeof(*rth)); 968686cdd19SJun-ichiro itojun Hagino if (rth == NULL) { 969e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 97033841545SHajimu UMEMOTO return (-1); 971686cdd19SJun-ichiro itojun Hagino } 972686cdd19SJun-ichiro itojun Hagino #endif 973686cdd19SJun-ichiro itojun Hagino rthlen = (rth->ip6r_len + 1) << 3; 974686cdd19SJun-ichiro itojun Hagino /* 975686cdd19SJun-ichiro itojun Hagino * XXX: currently there is no 976686cdd19SJun-ichiro itojun Hagino * officially defined type other 977686cdd19SJun-ichiro itojun Hagino * than type-0. 978686cdd19SJun-ichiro itojun Hagino * Note that if the segment left field 979686cdd19SJun-ichiro itojun Hagino * is 0, all intermediate hops must 980686cdd19SJun-ichiro itojun Hagino * have been passed. 981686cdd19SJun-ichiro itojun Hagino */ 982686cdd19SJun-ichiro itojun Hagino if (rth->ip6r_segleft && 983686cdd19SJun-ichiro itojun Hagino rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 984686cdd19SJun-ichiro itojun Hagino int hops; 985686cdd19SJun-ichiro itojun Hagino 986686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 98706cd0a3fSHajimu UMEMOTO IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1); 98806cd0a3fSHajimu UMEMOTO rth0 = (struct ip6_rthdr0 *) 98906cd0a3fSHajimu UMEMOTO (mtod(m, caddr_t) + eoff); 990686cdd19SJun-ichiro itojun Hagino #else 991686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(rth0, 992686cdd19SJun-ichiro itojun Hagino struct ip6_rthdr0 *, m, 993686cdd19SJun-ichiro itojun Hagino eoff, rthlen); 994686cdd19SJun-ichiro itojun Hagino if (rth0 == NULL) { 995e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 99633841545SHajimu UMEMOTO return (-1); 997686cdd19SJun-ichiro itojun Hagino } 998686cdd19SJun-ichiro itojun Hagino #endif 999686cdd19SJun-ichiro itojun Hagino /* just ignore a bogus header */ 1000686cdd19SJun-ichiro itojun Hagino if ((rth0->ip6r0_len % 2) == 0 && 1001686cdd19SJun-ichiro itojun Hagino (hops = rth0->ip6r0_len/2)) 1002686cdd19SJun-ichiro itojun Hagino finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 1003686cdd19SJun-ichiro itojun Hagino } 1004686cdd19SJun-ichiro itojun Hagino eoff += rthlen; 1005686cdd19SJun-ichiro itojun Hagino nxt = rth->ip6r_nxt; 1006686cdd19SJun-ichiro itojun Hagino break; 1007686cdd19SJun-ichiro itojun Hagino case IPPROTO_FRAGMENT: 1008686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 1009686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_CHECK(m, 0, eoff + 101006cd0a3fSHajimu UMEMOTO sizeof(struct ip6_frag), -1); 101106cd0a3fSHajimu UMEMOTO fh = (struct ip6_frag *)(mtod(m, caddr_t) + 101206cd0a3fSHajimu UMEMOTO eoff); 1013686cdd19SJun-ichiro itojun Hagino #else 1014686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1015686cdd19SJun-ichiro itojun Hagino eoff, sizeof(*fh)); 1016686cdd19SJun-ichiro itojun Hagino if (fh == NULL) { 1017e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 101833841545SHajimu UMEMOTO return (-1); 1019686cdd19SJun-ichiro itojun Hagino } 1020686cdd19SJun-ichiro itojun Hagino #endif 1021686cdd19SJun-ichiro itojun Hagino /* 1022686cdd19SJun-ichiro itojun Hagino * Data after a fragment header is meaningless 1023686cdd19SJun-ichiro itojun Hagino * unless it is the first fragment, but 1024686cdd19SJun-ichiro itojun Hagino * we'll go to the notify label for path MTU 1025686cdd19SJun-ichiro itojun Hagino * discovery. 1026686cdd19SJun-ichiro itojun Hagino */ 1027686cdd19SJun-ichiro itojun Hagino if (fh->ip6f_offlg & IP6F_OFF_MASK) 1028686cdd19SJun-ichiro itojun Hagino goto notify; 1029686cdd19SJun-ichiro itojun Hagino 1030686cdd19SJun-ichiro itojun Hagino eoff += sizeof(struct ip6_frag); 1031686cdd19SJun-ichiro itojun Hagino nxt = fh->ip6f_nxt; 1032686cdd19SJun-ichiro itojun Hagino break; 103382cd038dSYoshinobu Inoue default: 1034686cdd19SJun-ichiro itojun Hagino /* 1035686cdd19SJun-ichiro itojun Hagino * This case includes ESP and the No Next 1036686cdd19SJun-ichiro itojun Hagino * Header. In such cases going to the notify 1037686cdd19SJun-ichiro itojun Hagino * label does not have any meaning 1038686cdd19SJun-ichiro itojun Hagino * (i.e. ctlfunc will be NULL), but we go 1039686cdd19SJun-ichiro itojun Hagino * anyway since we might have to update 1040686cdd19SJun-ichiro itojun Hagino * path MTU information. 1041686cdd19SJun-ichiro itojun Hagino */ 104282cd038dSYoshinobu Inoue goto notify; 104382cd038dSYoshinobu Inoue } 104482cd038dSYoshinobu Inoue } 104582cd038dSYoshinobu Inoue notify: 1046686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 104782cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 1048686cdd19SJun-ichiro itojun Hagino #else 1049686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1050686cdd19SJun-ichiro itojun Hagino sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1051686cdd19SJun-ichiro itojun Hagino if (icmp6 == NULL) { 1052e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 105333841545SHajimu UMEMOTO return (-1); 1054686cdd19SJun-ichiro itojun Hagino } 1055686cdd19SJun-ichiro itojun Hagino #endif 105633841545SHajimu UMEMOTO 105706cd0a3fSHajimu UMEMOTO /* 105806cd0a3fSHajimu UMEMOTO * retrieve parameters from the inner IPv6 header, and convert 105906cd0a3fSHajimu UMEMOTO * them into sockaddr structures. 106006cd0a3fSHajimu UMEMOTO * XXX: there is no guarantee that the source or destination 106106cd0a3fSHajimu UMEMOTO * addresses of the inner packet are in the same scope as 106206cd0a3fSHajimu UMEMOTO * the addresses of the icmp packet. But there is no other 106306cd0a3fSHajimu UMEMOTO * way to determine the zone. 106406cd0a3fSHajimu UMEMOTO */ 106533841545SHajimu UMEMOTO eip6 = (struct ip6_hdr *)(icmp6 + 1); 106606cd0a3fSHajimu UMEMOTO 106733841545SHajimu UMEMOTO bzero(&icmp6dst, sizeof(icmp6dst)); 106833841545SHajimu UMEMOTO icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 106933841545SHajimu UMEMOTO icmp6dst.sin6_family = AF_INET6; 1070686cdd19SJun-ichiro itojun Hagino if (finaldst == NULL) 107133841545SHajimu UMEMOTO icmp6dst.sin6_addr = eip6->ip6_dst; 107233841545SHajimu UMEMOTO else 107333841545SHajimu UMEMOTO icmp6dst.sin6_addr = *finaldst; 1074a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL)) 10759a4f9608SHajimu UMEMOTO goto freeit; 107633841545SHajimu UMEMOTO bzero(&icmp6src, sizeof(icmp6src)); 107733841545SHajimu UMEMOTO icmp6src.sin6_len = sizeof(struct sockaddr_in6); 107833841545SHajimu UMEMOTO icmp6src.sin6_family = AF_INET6; 107933841545SHajimu UMEMOTO icmp6src.sin6_addr = eip6->ip6_src; 1080a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL)) 10819a4f9608SHajimu UMEMOTO goto freeit; 1082a1f7e5f8SHajimu UMEMOTO icmp6src.sin6_flowinfo = 1083a1f7e5f8SHajimu UMEMOTO (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 108433841545SHajimu UMEMOTO 108533841545SHajimu UMEMOTO if (finaldst == NULL) 108633841545SHajimu UMEMOTO finaldst = &eip6->ip6_dst; 108733841545SHajimu UMEMOTO ip6cp.ip6c_m = m; 108833841545SHajimu UMEMOTO ip6cp.ip6c_icmp6 = icmp6; 108933841545SHajimu UMEMOTO ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 109033841545SHajimu UMEMOTO ip6cp.ip6c_off = eoff; 109133841545SHajimu UMEMOTO ip6cp.ip6c_finaldst = finaldst; 109233841545SHajimu UMEMOTO ip6cp.ip6c_src = &icmp6src; 109333841545SHajimu UMEMOTO ip6cp.ip6c_nxt = nxt; 109433841545SHajimu UMEMOTO 109533841545SHajimu UMEMOTO if (icmp6type == ICMP6_PACKET_TOO_BIG) { 109633841545SHajimu UMEMOTO notifymtu = ntohl(icmp6->icmp6_mtu); 109733841545SHajimu UMEMOTO ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 109833841545SHajimu UMEMOTO icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/ 1099686cdd19SJun-ichiro itojun Hagino } 1100686cdd19SJun-ichiro itojun Hagino 11019233d8f3SDavid E. O'Brien ctlfunc = (void (*)(int, struct sockaddr *, void *)) 110282cd038dSYoshinobu Inoue (inet6sw[ip6_protox[nxt]].pr_ctlinput); 110382cd038dSYoshinobu Inoue if (ctlfunc) { 110433841545SHajimu UMEMOTO (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, 110533841545SHajimu UMEMOTO &ip6cp); 110682cd038dSYoshinobu Inoue } 110782cd038dSYoshinobu Inoue } 11089c0fda72SHajimu UMEMOTO *mp = m; 110933841545SHajimu UMEMOTO return (0); 111082cd038dSYoshinobu Inoue 111182cd038dSYoshinobu Inoue freeit: 111282cd038dSYoshinobu Inoue m_freem(m); 111333841545SHajimu UMEMOTO return (-1); 111482cd038dSYoshinobu Inoue } 111582cd038dSYoshinobu Inoue 111633841545SHajimu UMEMOTO void 11171272577eSXin LI icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1118686cdd19SJun-ichiro itojun Hagino { 11198b615593SMarko Zec INIT_VNET_INET6(curvnet); 112033841545SHajimu UMEMOTO struct in6_addr *dst = ip6cp->ip6c_finaldst; 112133841545SHajimu UMEMOTO struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 112233841545SHajimu UMEMOTO struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1123686cdd19SJun-ichiro itojun Hagino u_int mtu = ntohl(icmp6->icmp6_mtu); 112497d8d152SAndre Oppermann struct in_conninfo inc; 1125686cdd19SJun-ichiro itojun Hagino 1126f95d4633SHajimu UMEMOTO #if 0 1127f95d4633SHajimu UMEMOTO /* 1128f95d4633SHajimu UMEMOTO * RFC2460 section 5, last paragraph. 1129f95d4633SHajimu UMEMOTO * even though minimum link MTU for IPv6 is IPV6_MMTU, 1130f95d4633SHajimu UMEMOTO * we may see ICMPv6 too big with mtu < IPV6_MMTU 1131f95d4633SHajimu UMEMOTO * due to packet translator in the middle. 1132f95d4633SHajimu UMEMOTO * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for 1133f95d4633SHajimu UMEMOTO * special handling. 1134f95d4633SHajimu UMEMOTO */ 1135f95d4633SHajimu UMEMOTO if (mtu < IPV6_MMTU) 1136f95d4633SHajimu UMEMOTO return; 1137f95d4633SHajimu UMEMOTO #endif 1138f95d4633SHajimu UMEMOTO 1139f95d4633SHajimu UMEMOTO /* 1140f95d4633SHajimu UMEMOTO * we reject ICMPv6 too big with abnormally small value. 1141f95d4633SHajimu UMEMOTO * XXX what is the good definition of "abnormally small"? 1142f95d4633SHajimu UMEMOTO */ 1143f95d4633SHajimu UMEMOTO if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1144f95d4633SHajimu UMEMOTO return; 1145f95d4633SHajimu UMEMOTO 114633841545SHajimu UMEMOTO if (!validated) 114733841545SHajimu UMEMOTO return; 114833841545SHajimu UMEMOTO 114959ca51adSSimon L. B. Nielsen /* 115059ca51adSSimon L. B. Nielsen * In case the suggested mtu is less than IPV6_MMTU, we 115159ca51adSSimon L. B. Nielsen * only need to remember that it was for above mentioned 115259ca51adSSimon L. B. Nielsen * "alwaysfrag" case. 115359ca51adSSimon L. B. Nielsen * Try to be as close to the spec as possible. 115459ca51adSSimon L. B. Nielsen */ 115559ca51adSSimon L. B. Nielsen if (mtu < IPV6_MMTU) 115659ca51adSSimon L. B. Nielsen mtu = IPV6_MMTU - 8; 115759ca51adSSimon L. B. Nielsen 115897d8d152SAndre Oppermann bzero(&inc, sizeof(inc)); 1159dcdb4371SBjoern A. Zeeb inc.inc_flags |= INC_ISIPV6; 116097d8d152SAndre Oppermann inc.inc6_faddr = *dst; 1161a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL)) 1162a1f7e5f8SHajimu UMEMOTO return; 1163686cdd19SJun-ichiro itojun Hagino 1164233dcce1SAndre Oppermann if (mtu < tcp_maxmtu6(&inc, NULL)) { 116597d8d152SAndre Oppermann tcp_hc_updatemtu(&inc, mtu); 1166e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_pmtuchg); 1167686cdd19SJun-ichiro itojun Hagino } 1168686cdd19SJun-ichiro itojun Hagino } 1169686cdd19SJun-ichiro itojun Hagino 117082cd038dSYoshinobu Inoue /* 117133841545SHajimu UMEMOTO * Process a Node Information Query packet, based on 117233841545SHajimu UMEMOTO * draft-ietf-ipngwg-icmp-name-lookups-07. 1173686cdd19SJun-ichiro itojun Hagino * 1174686cdd19SJun-ichiro itojun Hagino * Spec incompatibilities: 1175686cdd19SJun-ichiro itojun Hagino * - IPv6 Subject address handling 1176686cdd19SJun-ichiro itojun Hagino * - IPv4 Subject address handling support missing 1177686cdd19SJun-ichiro itojun Hagino * - Proxy reply (answer even if it's not for me) 1178686cdd19SJun-ichiro itojun Hagino * - joins NI group address at in6_ifattach() time only, does not cope 1179686cdd19SJun-ichiro itojun Hagino * with hostname changes by sethostname(3) 118082cd038dSYoshinobu Inoue */ 118182cd038dSYoshinobu Inoue static struct mbuf * 11821272577eSXin LI ni6_input(struct mbuf *m, int off) 118382cd038dSYoshinobu Inoue { 11848b615593SMarko Zec INIT_VNET_INET6(curvnet); 1185686cdd19SJun-ichiro itojun Hagino struct icmp6_nodeinfo *ni6, *nni6; 118682cd038dSYoshinobu Inoue struct mbuf *n = NULL; 118776ca6f88SJamie Gritton struct prison *pr; 1188686cdd19SJun-ichiro itojun Hagino u_int16_t qtype; 1189686cdd19SJun-ichiro itojun Hagino int subjlen; 119082cd038dSYoshinobu Inoue int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 119182cd038dSYoshinobu Inoue struct ni_reply_fqdn *fqdn; 119282cd038dSYoshinobu Inoue int addrs; /* for NI_QTYPE_NODEADDR */ 119382cd038dSYoshinobu Inoue struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1194a1f7e5f8SHajimu UMEMOTO struct in6_addr in6_subj; /* subject address */ 1195686cdd19SJun-ichiro itojun Hagino struct ip6_hdr *ip6; 1196686cdd19SJun-ichiro itojun Hagino int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 119733841545SHajimu UMEMOTO char *subj = NULL; 119833841545SHajimu UMEMOTO struct in6_ifaddr *ia6 = NULL; 119982cd038dSYoshinobu Inoue 1200686cdd19SJun-ichiro itojun Hagino ip6 = mtod(m, struct ip6_hdr *); 1201686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 1202686cdd19SJun-ichiro itojun Hagino ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 1203686cdd19SJun-ichiro itojun Hagino #else 1204686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1205686cdd19SJun-ichiro itojun Hagino if (ni6 == NULL) { 1206686cdd19SJun-ichiro itojun Hagino /* m is already reclaimed */ 120706cd0a3fSHajimu UMEMOTO return (NULL); 1208686cdd19SJun-ichiro itojun Hagino } 1209686cdd19SJun-ichiro itojun Hagino #endif 1210686cdd19SJun-ichiro itojun Hagino 1211686cdd19SJun-ichiro itojun Hagino /* 121218706985SJINMEI Tatuya * Validate IPv6 source address. 121318706985SJINMEI Tatuya * The default configuration MUST be to refuse answering queries from 121418706985SJINMEI Tatuya * global-scope addresses according to RFC4602. 121518706985SJINMEI Tatuya * Notes: 121618706985SJINMEI Tatuya * - it's not very clear what "refuse" means; this implementation 121718706985SJINMEI Tatuya * simply drops it. 121818706985SJINMEI Tatuya * - it's not very easy to identify global-scope (unicast) addresses 121918706985SJINMEI Tatuya * since there are many prefixes for them. It should be safer 122018706985SJINMEI Tatuya * and in practice sufficient to check "all" but loopback and 122118706985SJINMEI Tatuya * link-local (note that site-local unicast was deprecated and 122218706985SJINMEI Tatuya * ULA is defined as global scope-wise) 122318706985SJINMEI Tatuya */ 1224603724d3SBjoern A. Zeeb if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 && 122518706985SJINMEI Tatuya !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) && 122618706985SJINMEI Tatuya !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 122718706985SJINMEI Tatuya goto bad; 122818706985SJINMEI Tatuya 122918706985SJINMEI Tatuya /* 1230686cdd19SJun-ichiro itojun Hagino * Validate IPv6 destination address. 1231686cdd19SJun-ichiro itojun Hagino * 123233841545SHajimu UMEMOTO * The Responder must discard the Query without further processing 123333841545SHajimu UMEMOTO * unless it is one of the Responder's unicast or anycast addresses, or 123433841545SHajimu UMEMOTO * a link-local scope multicast address which the Responder has joined. 123518706985SJINMEI Tatuya * [RFC4602, Section 5.] 1236686cdd19SJun-ichiro itojun Hagino */ 12372a5aafceSHajimu UMEMOTO if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 12382a5aafceSHajimu UMEMOTO if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 12392a5aafceSHajimu UMEMOTO goto bad; 12402a5aafceSHajimu UMEMOTO /* else it's a link-local multicast, fine */ 12412a5aafceSHajimu UMEMOTO } else { /* unicast or anycast */ 12422a5aafceSHajimu UMEMOTO if ((ia6 = ip6_getdstifaddr(m)) == NULL) 12432a5aafceSHajimu UMEMOTO goto bad; /* XXX impossible */ 12442a5aafceSHajimu UMEMOTO 12452a5aafceSHajimu UMEMOTO if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) && 1246603724d3SBjoern A. Zeeb !(V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) { 12478c0fec80SRobert Watson ifa_free(&ia6->ia_ifa); 124833841545SHajimu UMEMOTO nd6log((LOG_DEBUG, "ni6_input: ignore node info to " 124933841545SHajimu UMEMOTO "a temporary address in %s:%d", 125033841545SHajimu UMEMOTO __FILE__, __LINE__)); 125133841545SHajimu UMEMOTO goto bad; 125233841545SHajimu UMEMOTO } 12538c0fec80SRobert Watson ifa_free(&ia6->ia_ifa); 12542a5aafceSHajimu UMEMOTO } 1255686cdd19SJun-ichiro itojun Hagino 1256686cdd19SJun-ichiro itojun Hagino /* validate query Subject field. */ 125733841545SHajimu UMEMOTO qtype = ntohs(ni6->ni_qtype); 1258686cdd19SJun-ichiro itojun Hagino subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1259686cdd19SJun-ichiro itojun Hagino switch (qtype) { 1260686cdd19SJun-ichiro itojun Hagino case NI_QTYPE_NOOP: 1261686cdd19SJun-ichiro itojun Hagino case NI_QTYPE_SUPTYPES: 126233841545SHajimu UMEMOTO /* 07 draft */ 126333841545SHajimu UMEMOTO if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1264686cdd19SJun-ichiro itojun Hagino break; 126533841545SHajimu UMEMOTO /* FALLTHROUGH */ 1266686cdd19SJun-ichiro itojun Hagino case NI_QTYPE_FQDN: 1267686cdd19SJun-ichiro itojun Hagino case NI_QTYPE_NODEADDR: 1268a22adbc6SSUZUKI Shinsuke case NI_QTYPE_IPV4ADDR: 1269686cdd19SJun-ichiro itojun Hagino switch (ni6->ni_code) { 1270686cdd19SJun-ichiro itojun Hagino case ICMP6_NI_SUBJ_IPV6: 1271686cdd19SJun-ichiro itojun Hagino #if ICMP6_NI_SUBJ_IPV6 != 0 1272686cdd19SJun-ichiro itojun Hagino case 0: 1273686cdd19SJun-ichiro itojun Hagino #endif 1274686cdd19SJun-ichiro itojun Hagino /* 1275686cdd19SJun-ichiro itojun Hagino * backward compatibility - try to accept 03 draft 1276686cdd19SJun-ichiro itojun Hagino * format, where no Subject is present. 1277686cdd19SJun-ichiro itojun Hagino */ 127833841545SHajimu UMEMOTO if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 127933841545SHajimu UMEMOTO subjlen == 0) { 1280686cdd19SJun-ichiro itojun Hagino oldfqdn++; 1281686cdd19SJun-ichiro itojun Hagino break; 1282686cdd19SJun-ichiro itojun Hagino } 128333841545SHajimu UMEMOTO #if ICMP6_NI_SUBJ_IPV6 != 0 128433841545SHajimu UMEMOTO if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 128533841545SHajimu UMEMOTO goto bad; 128633841545SHajimu UMEMOTO #endif 1287686cdd19SJun-ichiro itojun Hagino 12882a5aafceSHajimu UMEMOTO if (subjlen != sizeof(struct in6_addr)) 1289686cdd19SJun-ichiro itojun Hagino goto bad; 1290686cdd19SJun-ichiro itojun Hagino 1291686cdd19SJun-ichiro itojun Hagino /* 1292686cdd19SJun-ichiro itojun Hagino * Validate Subject address. 1293686cdd19SJun-ichiro itojun Hagino * 129433841545SHajimu UMEMOTO * Not sure what exactly "address belongs to the node" 129533841545SHajimu UMEMOTO * means in the spec, is it just unicast, or what? 1296686cdd19SJun-ichiro itojun Hagino * 1297686cdd19SJun-ichiro itojun Hagino * At this moment we consider Subject address as 1298686cdd19SJun-ichiro itojun Hagino * "belong to the node" if the Subject address equals 1299686cdd19SJun-ichiro itojun Hagino * to the IPv6 destination address; validation for 1300686cdd19SJun-ichiro itojun Hagino * IPv6 destination address should have done enough 1301686cdd19SJun-ichiro itojun Hagino * check for us. 1302686cdd19SJun-ichiro itojun Hagino * 1303686cdd19SJun-ichiro itojun Hagino * We do not do proxy at this moment. 1304686cdd19SJun-ichiro itojun Hagino */ 1305686cdd19SJun-ichiro itojun Hagino /* m_pulldown instead of copy? */ 1306686cdd19SJun-ichiro itojun Hagino m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1307a1f7e5f8SHajimu UMEMOTO subjlen, (caddr_t)&in6_subj); 1308a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL)) 13099a4f9608SHajimu UMEMOTO goto bad; 13102a5aafceSHajimu UMEMOTO 1311a1f7e5f8SHajimu UMEMOTO subj = (char *)&in6_subj; 1312a1f7e5f8SHajimu UMEMOTO if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1313686cdd19SJun-ichiro itojun Hagino break; 131433841545SHajimu UMEMOTO 1315686cdd19SJun-ichiro itojun Hagino /* 1316686cdd19SJun-ichiro itojun Hagino * XXX if we are to allow other cases, we should really 1317686cdd19SJun-ichiro itojun Hagino * be careful about scope here. 1318686cdd19SJun-ichiro itojun Hagino * basically, we should disallow queries toward IPv6 131906cd0a3fSHajimu UMEMOTO * destination X with subject Y, 132006cd0a3fSHajimu UMEMOTO * if scope(X) > scope(Y). 1321686cdd19SJun-ichiro itojun Hagino * if we allow scope(X) > scope(Y), it will result in 1322686cdd19SJun-ichiro itojun Hagino * information leakage across scope boundary. 1323686cdd19SJun-ichiro itojun Hagino */ 1324686cdd19SJun-ichiro itojun Hagino goto bad; 1325686cdd19SJun-ichiro itojun Hagino 1326686cdd19SJun-ichiro itojun Hagino case ICMP6_NI_SUBJ_FQDN: 1327686cdd19SJun-ichiro itojun Hagino /* 1328686cdd19SJun-ichiro itojun Hagino * Validate Subject name with gethostname(3). 1329686cdd19SJun-ichiro itojun Hagino * 1330686cdd19SJun-ichiro itojun Hagino * The behavior may need some debate, since: 1331686cdd19SJun-ichiro itojun Hagino * - we are not sure if the node has FQDN as 1332686cdd19SJun-ichiro itojun Hagino * hostname (returned by gethostname(3)). 1333686cdd19SJun-ichiro itojun Hagino * - the code does wildcard match for truncated names. 1334686cdd19SJun-ichiro itojun Hagino * however, we are not sure if we want to perform 1335686cdd19SJun-ichiro itojun Hagino * wildcard match, if gethostname(3) side has 1336686cdd19SJun-ichiro itojun Hagino * truncated hostname. 1337686cdd19SJun-ichiro itojun Hagino */ 133876ca6f88SJamie Gritton pr = curthread->td_ucred->cr_prison; 133976ca6f88SJamie Gritton mtx_lock(&pr->pr_mtx); 1340c1f19219SJamie Gritton n = ni6_nametodns(pr->pr_hostname, 1341c1f19219SJamie Gritton strlen(pr->pr_hostname), 0); 134276ca6f88SJamie Gritton mtx_unlock(&pr->pr_mtx); 1343686cdd19SJun-ichiro itojun Hagino if (!n || n->m_next || n->m_len == 0) 1344686cdd19SJun-ichiro itojun Hagino goto bad; 1345686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(subj, char *, m, 1346686cdd19SJun-ichiro itojun Hagino off + sizeof(struct icmp6_nodeinfo), subjlen); 1347686cdd19SJun-ichiro itojun Hagino if (subj == NULL) 1348686cdd19SJun-ichiro itojun Hagino goto bad; 1349686cdd19SJun-ichiro itojun Hagino if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1350686cdd19SJun-ichiro itojun Hagino n->m_len)) { 1351686cdd19SJun-ichiro itojun Hagino goto bad; 1352686cdd19SJun-ichiro itojun Hagino } 1353686cdd19SJun-ichiro itojun Hagino m_freem(n); 1354686cdd19SJun-ichiro itojun Hagino n = NULL; 1355686cdd19SJun-ichiro itojun Hagino break; 1356686cdd19SJun-ichiro itojun Hagino 135733841545SHajimu UMEMOTO case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1358686cdd19SJun-ichiro itojun Hagino default: 1359686cdd19SJun-ichiro itojun Hagino goto bad; 1360686cdd19SJun-ichiro itojun Hagino } 1361686cdd19SJun-ichiro itojun Hagino break; 1362686cdd19SJun-ichiro itojun Hagino } 1363686cdd19SJun-ichiro itojun Hagino 136433841545SHajimu UMEMOTO /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 136533841545SHajimu UMEMOTO switch (qtype) { 136633841545SHajimu UMEMOTO case NI_QTYPE_FQDN: 1367603724d3SBjoern A. Zeeb if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0) 136833841545SHajimu UMEMOTO goto bad; 136933841545SHajimu UMEMOTO break; 137033841545SHajimu UMEMOTO case NI_QTYPE_NODEADDR: 1371a22adbc6SSUZUKI Shinsuke case NI_QTYPE_IPV4ADDR: 1372603724d3SBjoern A. Zeeb if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0) 137333841545SHajimu UMEMOTO goto bad; 137433841545SHajimu UMEMOTO break; 137533841545SHajimu UMEMOTO } 137633841545SHajimu UMEMOTO 137733841545SHajimu UMEMOTO /* guess reply length */ 137833841545SHajimu UMEMOTO switch (qtype) { 137933841545SHajimu UMEMOTO case NI_QTYPE_NOOP: 138033841545SHajimu UMEMOTO break; /* no reply data */ 138133841545SHajimu UMEMOTO case NI_QTYPE_SUPTYPES: 138233841545SHajimu UMEMOTO replylen += sizeof(u_int32_t); 138333841545SHajimu UMEMOTO break; 138433841545SHajimu UMEMOTO case NI_QTYPE_FQDN: 138533841545SHajimu UMEMOTO /* XXX will append an mbuf */ 138633841545SHajimu UMEMOTO replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 138733841545SHajimu UMEMOTO break; 138833841545SHajimu UMEMOTO case NI_QTYPE_NODEADDR: 1389c66b5feaSHajimu UMEMOTO addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj); 139033841545SHajimu UMEMOTO if ((replylen += addrs * (sizeof(struct in6_addr) + 139133841545SHajimu UMEMOTO sizeof(u_int32_t))) > MCLBYTES) 139233841545SHajimu UMEMOTO replylen = MCLBYTES; /* XXX: will truncate pkt later */ 139333841545SHajimu UMEMOTO break; 1394a22adbc6SSUZUKI Shinsuke case NI_QTYPE_IPV4ADDR: 1395a22adbc6SSUZUKI Shinsuke /* unsupported - should respond with unknown Qtype? */ 1396a22adbc6SSUZUKI Shinsuke break; 139733841545SHajimu UMEMOTO default: 139833841545SHajimu UMEMOTO /* 139933841545SHajimu UMEMOTO * XXX: We must return a reply with the ICMP6 code 140033841545SHajimu UMEMOTO * `unknown Qtype' in this case. However we regard the case 140133841545SHajimu UMEMOTO * as an FQDN query for backward compatibility. 140233841545SHajimu UMEMOTO * Older versions set a random value to this field, 140333841545SHajimu UMEMOTO * so it rarely varies in the defined qtypes. 140433841545SHajimu UMEMOTO * But the mechanism is not reliable... 140533841545SHajimu UMEMOTO * maybe we should obsolete older versions. 140633841545SHajimu UMEMOTO */ 140733841545SHajimu UMEMOTO qtype = NI_QTYPE_FQDN; 140833841545SHajimu UMEMOTO /* XXX will append an mbuf */ 140933841545SHajimu UMEMOTO replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 141033841545SHajimu UMEMOTO oldfqdn++; 141133841545SHajimu UMEMOTO break; 141233841545SHajimu UMEMOTO } 141333841545SHajimu UMEMOTO 141433841545SHajimu UMEMOTO /* allocate an mbuf to reply. */ 1415a163d034SWarner Losh MGETHDR(n, M_DONTWAIT, m->m_type); 1416686cdd19SJun-ichiro itojun Hagino if (n == NULL) { 1417686cdd19SJun-ichiro itojun Hagino m_freem(m); 141882cd038dSYoshinobu Inoue return (NULL); 1419686cdd19SJun-ichiro itojun Hagino } 14209967cafcSSam Leffler M_MOVE_PKTHDR(n, m); /* just for recvif */ 142182cd038dSYoshinobu Inoue if (replylen > MHLEN) { 1422686cdd19SJun-ichiro itojun Hagino if (replylen > MCLBYTES) { 142382cd038dSYoshinobu Inoue /* 142433841545SHajimu UMEMOTO * XXX: should we try to allocate more? But MCLBYTES 142533841545SHajimu UMEMOTO * is probably much larger than IPV6_MMTU... 142682cd038dSYoshinobu Inoue */ 142782cd038dSYoshinobu Inoue goto bad; 1428686cdd19SJun-ichiro itojun Hagino } 1429a163d034SWarner Losh MCLGET(n, M_DONTWAIT); 143082cd038dSYoshinobu Inoue if ((n->m_flags & M_EXT) == 0) { 143182cd038dSYoshinobu Inoue goto bad; 143282cd038dSYoshinobu Inoue } 143382cd038dSYoshinobu Inoue } 143482cd038dSYoshinobu Inoue n->m_pkthdr.len = n->m_len = replylen; 143582cd038dSYoshinobu Inoue 143682cd038dSYoshinobu Inoue /* copy mbuf header and IPv6 + Node Information base headers */ 143782cd038dSYoshinobu Inoue bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 143882cd038dSYoshinobu Inoue nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1439686cdd19SJun-ichiro itojun Hagino bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 144082cd038dSYoshinobu Inoue 144182cd038dSYoshinobu Inoue /* qtype dependent procedure */ 144282cd038dSYoshinobu Inoue switch (qtype) { 144382cd038dSYoshinobu Inoue case NI_QTYPE_NOOP: 144433841545SHajimu UMEMOTO nni6->ni_code = ICMP6_NI_SUCCESS; 144582cd038dSYoshinobu Inoue nni6->ni_flags = 0; 144682cd038dSYoshinobu Inoue break; 144782cd038dSYoshinobu Inoue case NI_QTYPE_SUPTYPES: 144833841545SHajimu UMEMOTO { 144933841545SHajimu UMEMOTO u_int32_t v; 145033841545SHajimu UMEMOTO nni6->ni_code = ICMP6_NI_SUCCESS; 145133841545SHajimu UMEMOTO nni6->ni_flags = htons(0x0000); /* raw bitmap */ 145233841545SHajimu UMEMOTO /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 145333841545SHajimu UMEMOTO v = (u_int32_t)htonl(0x0000000f); 145433841545SHajimu UMEMOTO bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 145582cd038dSYoshinobu Inoue break; 145633841545SHajimu UMEMOTO } 145782cd038dSYoshinobu Inoue case NI_QTYPE_FQDN: 145833841545SHajimu UMEMOTO nni6->ni_code = ICMP6_NI_SUCCESS; 145982cd038dSYoshinobu Inoue fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 146006cd0a3fSHajimu UMEMOTO sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo)); 146182cd038dSYoshinobu Inoue nni6->ni_flags = 0; /* XXX: meaningless TTL */ 146282cd038dSYoshinobu Inoue fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1463686cdd19SJun-ichiro itojun Hagino /* 146476ca6f88SJamie Gritton * XXX do we really have FQDN in hostname? 1465686cdd19SJun-ichiro itojun Hagino */ 146676ca6f88SJamie Gritton pr = curthread->td_ucred->cr_prison; 146776ca6f88SJamie Gritton mtx_lock(&pr->pr_mtx); 1468c1f19219SJamie Gritton n->m_next = ni6_nametodns(pr->pr_hostname, 1469c1f19219SJamie Gritton strlen(pr->pr_hostname), oldfqdn); 147076ca6f88SJamie Gritton mtx_unlock(&pr->pr_mtx); 1471686cdd19SJun-ichiro itojun Hagino if (n->m_next == NULL) 1472686cdd19SJun-ichiro itojun Hagino goto bad; 1473686cdd19SJun-ichiro itojun Hagino /* XXX we assume that n->m_next is not a chain */ 1474686cdd19SJun-ichiro itojun Hagino if (n->m_next->m_next != NULL) 1475686cdd19SJun-ichiro itojun Hagino goto bad; 1476686cdd19SJun-ichiro itojun Hagino n->m_pkthdr.len += n->m_next->m_len; 147782cd038dSYoshinobu Inoue break; 147882cd038dSYoshinobu Inoue case NI_QTYPE_NODEADDR: 147982cd038dSYoshinobu Inoue { 148082cd038dSYoshinobu Inoue int lenlim, copied; 148182cd038dSYoshinobu Inoue 148233841545SHajimu UMEMOTO nni6->ni_code = ICMP6_NI_SUCCESS; 148333841545SHajimu UMEMOTO n->m_pkthdr.len = n->m_len = 148433841545SHajimu UMEMOTO sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 148533841545SHajimu UMEMOTO lenlim = M_TRAILINGSPACE(n); 148682cd038dSYoshinobu Inoue copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 148782cd038dSYoshinobu Inoue /* XXX: reset mbuf length */ 148882cd038dSYoshinobu Inoue n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 148982cd038dSYoshinobu Inoue sizeof(struct icmp6_nodeinfo) + copied; 149082cd038dSYoshinobu Inoue break; 149182cd038dSYoshinobu Inoue } 149282cd038dSYoshinobu Inoue default: 149382cd038dSYoshinobu Inoue break; /* XXX impossible! */ 149482cd038dSYoshinobu Inoue } 149582cd038dSYoshinobu Inoue 149682cd038dSYoshinobu Inoue nni6->ni_type = ICMP6_NI_REPLY; 1497686cdd19SJun-ichiro itojun Hagino m_freem(m); 149882cd038dSYoshinobu Inoue return (n); 149982cd038dSYoshinobu Inoue 150082cd038dSYoshinobu Inoue bad: 1501686cdd19SJun-ichiro itojun Hagino m_freem(m); 150282cd038dSYoshinobu Inoue if (n) 150382cd038dSYoshinobu Inoue m_freem(n); 150482cd038dSYoshinobu Inoue return (NULL); 150582cd038dSYoshinobu Inoue } 150682cd038dSYoshinobu Inoue 150782cd038dSYoshinobu Inoue /* 1508686cdd19SJun-ichiro itojun Hagino * make a mbuf with DNS-encoded string. no compression support. 1509686cdd19SJun-ichiro itojun Hagino * 1510686cdd19SJun-ichiro itojun Hagino * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1511686cdd19SJun-ichiro itojun Hagino * treated as truncated name (two \0 at the end). this is a wild guess. 15121272577eSXin LI * 15131272577eSXin LI * old - return pascal string if non-zero 1514686cdd19SJun-ichiro itojun Hagino */ 1515686cdd19SJun-ichiro itojun Hagino static struct mbuf * 15161272577eSXin LI ni6_nametodns(const char *name, int namelen, int old) 1517686cdd19SJun-ichiro itojun Hagino { 1518686cdd19SJun-ichiro itojun Hagino struct mbuf *m; 1519686cdd19SJun-ichiro itojun Hagino char *cp, *ep; 1520686cdd19SJun-ichiro itojun Hagino const char *p, *q; 1521686cdd19SJun-ichiro itojun Hagino int i, len, nterm; 1522686cdd19SJun-ichiro itojun Hagino 1523686cdd19SJun-ichiro itojun Hagino if (old) 1524686cdd19SJun-ichiro itojun Hagino len = namelen + 1; 1525686cdd19SJun-ichiro itojun Hagino else 1526686cdd19SJun-ichiro itojun Hagino len = MCLBYTES; 1527686cdd19SJun-ichiro itojun Hagino 1528686cdd19SJun-ichiro itojun Hagino /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1529a163d034SWarner Losh MGET(m, M_DONTWAIT, MT_DATA); 1530686cdd19SJun-ichiro itojun Hagino if (m && len > MLEN) { 1531a163d034SWarner Losh MCLGET(m, M_DONTWAIT); 1532686cdd19SJun-ichiro itojun Hagino if ((m->m_flags & M_EXT) == 0) 1533686cdd19SJun-ichiro itojun Hagino goto fail; 1534686cdd19SJun-ichiro itojun Hagino } 1535686cdd19SJun-ichiro itojun Hagino if (!m) 1536686cdd19SJun-ichiro itojun Hagino goto fail; 1537686cdd19SJun-ichiro itojun Hagino m->m_next = NULL; 1538686cdd19SJun-ichiro itojun Hagino 1539686cdd19SJun-ichiro itojun Hagino if (old) { 1540686cdd19SJun-ichiro itojun Hagino m->m_len = len; 1541686cdd19SJun-ichiro itojun Hagino *mtod(m, char *) = namelen; 1542686cdd19SJun-ichiro itojun Hagino bcopy(name, mtod(m, char *) + 1, namelen); 1543686cdd19SJun-ichiro itojun Hagino return m; 1544686cdd19SJun-ichiro itojun Hagino } else { 1545686cdd19SJun-ichiro itojun Hagino m->m_len = 0; 1546686cdd19SJun-ichiro itojun Hagino cp = mtod(m, char *); 1547686cdd19SJun-ichiro itojun Hagino ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1548686cdd19SJun-ichiro itojun Hagino 1549686cdd19SJun-ichiro itojun Hagino /* if not certain about my name, return empty buffer */ 1550686cdd19SJun-ichiro itojun Hagino if (namelen == 0) 1551686cdd19SJun-ichiro itojun Hagino return m; 1552686cdd19SJun-ichiro itojun Hagino 1553686cdd19SJun-ichiro itojun Hagino /* 1554686cdd19SJun-ichiro itojun Hagino * guess if it looks like shortened hostname, or FQDN. 1555686cdd19SJun-ichiro itojun Hagino * shortened hostname needs two trailing "\0". 1556686cdd19SJun-ichiro itojun Hagino */ 1557686cdd19SJun-ichiro itojun Hagino i = 0; 1558686cdd19SJun-ichiro itojun Hagino for (p = name; p < name + namelen; p++) { 1559686cdd19SJun-ichiro itojun Hagino if (*p && *p == '.') 1560686cdd19SJun-ichiro itojun Hagino i++; 1561686cdd19SJun-ichiro itojun Hagino } 1562686cdd19SJun-ichiro itojun Hagino if (i < 2) 1563686cdd19SJun-ichiro itojun Hagino nterm = 2; 1564686cdd19SJun-ichiro itojun Hagino else 1565686cdd19SJun-ichiro itojun Hagino nterm = 1; 1566686cdd19SJun-ichiro itojun Hagino 1567686cdd19SJun-ichiro itojun Hagino p = name; 1568686cdd19SJun-ichiro itojun Hagino while (cp < ep && p < name + namelen) { 1569686cdd19SJun-ichiro itojun Hagino i = 0; 1570686cdd19SJun-ichiro itojun Hagino for (q = p; q < name + namelen && *q && *q != '.'; q++) 1571686cdd19SJun-ichiro itojun Hagino i++; 1572686cdd19SJun-ichiro itojun Hagino /* result does not fit into mbuf */ 1573686cdd19SJun-ichiro itojun Hagino if (cp + i + 1 >= ep) 1574686cdd19SJun-ichiro itojun Hagino goto fail; 1575610be6ceSHajimu UMEMOTO /* 1576610be6ceSHajimu UMEMOTO * DNS label length restriction, RFC1035 page 8. 1577610be6ceSHajimu UMEMOTO * "i == 0" case is included here to avoid returning 1578610be6ceSHajimu UMEMOTO * 0-length label on "foo..bar". 1579610be6ceSHajimu UMEMOTO */ 1580610be6ceSHajimu UMEMOTO if (i <= 0 || i >= 64) 1581686cdd19SJun-ichiro itojun Hagino goto fail; 1582686cdd19SJun-ichiro itojun Hagino *cp++ = i; 1583686cdd19SJun-ichiro itojun Hagino bcopy(p, cp, i); 1584686cdd19SJun-ichiro itojun Hagino cp += i; 1585686cdd19SJun-ichiro itojun Hagino p = q; 1586686cdd19SJun-ichiro itojun Hagino if (p < name + namelen && *p == '.') 1587686cdd19SJun-ichiro itojun Hagino p++; 1588686cdd19SJun-ichiro itojun Hagino } 1589686cdd19SJun-ichiro itojun Hagino /* termination */ 1590686cdd19SJun-ichiro itojun Hagino if (cp + nterm >= ep) 1591686cdd19SJun-ichiro itojun Hagino goto fail; 1592686cdd19SJun-ichiro itojun Hagino while (nterm-- > 0) 1593686cdd19SJun-ichiro itojun Hagino *cp++ = '\0'; 1594686cdd19SJun-ichiro itojun Hagino m->m_len = cp - mtod(m, char *); 1595686cdd19SJun-ichiro itojun Hagino return m; 1596686cdd19SJun-ichiro itojun Hagino } 1597686cdd19SJun-ichiro itojun Hagino 1598686cdd19SJun-ichiro itojun Hagino panic("should not reach here"); 1599686cdd19SJun-ichiro itojun Hagino /* NOTREACHED */ 1600686cdd19SJun-ichiro itojun Hagino 1601686cdd19SJun-ichiro itojun Hagino fail: 1602686cdd19SJun-ichiro itojun Hagino if (m) 1603686cdd19SJun-ichiro itojun Hagino m_freem(m); 1604686cdd19SJun-ichiro itojun Hagino return NULL; 1605686cdd19SJun-ichiro itojun Hagino } 1606686cdd19SJun-ichiro itojun Hagino 1607686cdd19SJun-ichiro itojun Hagino /* 1608686cdd19SJun-ichiro itojun Hagino * check if two DNS-encoded string matches. takes care of truncated 1609686cdd19SJun-ichiro itojun Hagino * form (with \0\0 at the end). no compression support. 161033841545SHajimu UMEMOTO * XXX upper/lowercase match (see RFC2065) 1611686cdd19SJun-ichiro itojun Hagino */ 1612686cdd19SJun-ichiro itojun Hagino static int 16131272577eSXin LI ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1614686cdd19SJun-ichiro itojun Hagino { 1615686cdd19SJun-ichiro itojun Hagino const char *a0, *b0; 1616686cdd19SJun-ichiro itojun Hagino int l; 1617686cdd19SJun-ichiro itojun Hagino 1618686cdd19SJun-ichiro itojun Hagino /* simplest case - need validation? */ 1619686cdd19SJun-ichiro itojun Hagino if (alen == blen && bcmp(a, b, alen) == 0) 1620686cdd19SJun-ichiro itojun Hagino return 1; 1621686cdd19SJun-ichiro itojun Hagino 1622686cdd19SJun-ichiro itojun Hagino a0 = a; 1623686cdd19SJun-ichiro itojun Hagino b0 = b; 1624686cdd19SJun-ichiro itojun Hagino 1625686cdd19SJun-ichiro itojun Hagino /* termination is mandatory */ 1626686cdd19SJun-ichiro itojun Hagino if (alen < 2 || blen < 2) 1627686cdd19SJun-ichiro itojun Hagino return 0; 1628686cdd19SJun-ichiro itojun Hagino if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1629686cdd19SJun-ichiro itojun Hagino return 0; 1630686cdd19SJun-ichiro itojun Hagino alen--; 1631686cdd19SJun-ichiro itojun Hagino blen--; 1632686cdd19SJun-ichiro itojun Hagino 1633686cdd19SJun-ichiro itojun Hagino while (a - a0 < alen && b - b0 < blen) { 1634686cdd19SJun-ichiro itojun Hagino if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1635686cdd19SJun-ichiro itojun Hagino return 0; 1636686cdd19SJun-ichiro itojun Hagino 1637686cdd19SJun-ichiro itojun Hagino if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1638686cdd19SJun-ichiro itojun Hagino return 0; 1639686cdd19SJun-ichiro itojun Hagino /* we don't support compression yet */ 1640686cdd19SJun-ichiro itojun Hagino if (a[0] >= 64 || b[0] >= 64) 1641686cdd19SJun-ichiro itojun Hagino return 0; 1642686cdd19SJun-ichiro itojun Hagino 1643686cdd19SJun-ichiro itojun Hagino /* truncated case */ 1644686cdd19SJun-ichiro itojun Hagino if (a[0] == 0 && a - a0 == alen - 1) 1645686cdd19SJun-ichiro itojun Hagino return 1; 1646686cdd19SJun-ichiro itojun Hagino if (b[0] == 0 && b - b0 == blen - 1) 1647686cdd19SJun-ichiro itojun Hagino return 1; 1648686cdd19SJun-ichiro itojun Hagino if (a[0] == 0 || b[0] == 0) 1649686cdd19SJun-ichiro itojun Hagino return 0; 1650686cdd19SJun-ichiro itojun Hagino 1651686cdd19SJun-ichiro itojun Hagino if (a[0] != b[0]) 1652686cdd19SJun-ichiro itojun Hagino return 0; 1653686cdd19SJun-ichiro itojun Hagino l = a[0]; 1654686cdd19SJun-ichiro itojun Hagino if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1655686cdd19SJun-ichiro itojun Hagino return 0; 1656686cdd19SJun-ichiro itojun Hagino if (bcmp(a + 1, b + 1, l) != 0) 1657686cdd19SJun-ichiro itojun Hagino return 0; 1658686cdd19SJun-ichiro itojun Hagino 1659686cdd19SJun-ichiro itojun Hagino a += 1 + l; 1660686cdd19SJun-ichiro itojun Hagino b += 1 + l; 1661686cdd19SJun-ichiro itojun Hagino } 1662686cdd19SJun-ichiro itojun Hagino 1663686cdd19SJun-ichiro itojun Hagino if (a - a0 == alen && b - b0 == blen) 1664686cdd19SJun-ichiro itojun Hagino return 1; 1665686cdd19SJun-ichiro itojun Hagino else 1666686cdd19SJun-ichiro itojun Hagino return 0; 1667686cdd19SJun-ichiro itojun Hagino } 1668686cdd19SJun-ichiro itojun Hagino 1669686cdd19SJun-ichiro itojun Hagino /* 167082cd038dSYoshinobu Inoue * calculate the number of addresses to be returned in the node info reply. 167182cd038dSYoshinobu Inoue */ 167282cd038dSYoshinobu Inoue static int 16731272577eSXin LI ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp, 16741272577eSXin LI struct in6_addr *subj) 167582cd038dSYoshinobu Inoue { 16768b615593SMarko Zec INIT_VNET_NET(curvnet); 16778b615593SMarko Zec INIT_VNET_INET6(curvnet); 167833841545SHajimu UMEMOTO struct ifnet *ifp; 167933841545SHajimu UMEMOTO struct in6_ifaddr *ifa6; 168033841545SHajimu UMEMOTO struct ifaddr *ifa; 168182cd038dSYoshinobu Inoue int addrs = 0, addrsofif, iffound = 0; 168233841545SHajimu UMEMOTO int niflags = ni6->ni_flags; 168333841545SHajimu UMEMOTO 168433841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 168533841545SHajimu UMEMOTO switch (ni6->ni_code) { 168633841545SHajimu UMEMOTO case ICMP6_NI_SUBJ_IPV6: 168733841545SHajimu UMEMOTO if (subj == NULL) /* must be impossible... */ 168833841545SHajimu UMEMOTO return (0); 168933841545SHajimu UMEMOTO break; 169033841545SHajimu UMEMOTO default: 169133841545SHajimu UMEMOTO /* 169233841545SHajimu UMEMOTO * XXX: we only support IPv6 subject address for 169333841545SHajimu UMEMOTO * this Qtype. 169433841545SHajimu UMEMOTO */ 169533841545SHajimu UMEMOTO return (0); 169633841545SHajimu UMEMOTO } 169733841545SHajimu UMEMOTO } 169882cd038dSYoshinobu Inoue 1699b30a244cSJeffrey Hsu IFNET_RLOCK(); 1700603724d3SBjoern A. Zeeb for (ifp = TAILQ_FIRST(&V_ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 170182cd038dSYoshinobu Inoue addrsofif = 0; 17021e1d603eSRobert Watson IF_ADDR_LOCK(ifp); 1703c4dd3fe1SRobert Watson TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 170482cd038dSYoshinobu Inoue if (ifa->ifa_addr->sa_family != AF_INET6) 170582cd038dSYoshinobu Inoue continue; 170682cd038dSYoshinobu Inoue ifa6 = (struct in6_ifaddr *)ifa; 170782cd038dSYoshinobu Inoue 170833841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1709c66b5feaSHajimu UMEMOTO IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr)) 171082cd038dSYoshinobu Inoue iffound = 1; 171182cd038dSYoshinobu Inoue 1712686cdd19SJun-ichiro itojun Hagino /* 1713686cdd19SJun-ichiro itojun Hagino * IPv4-mapped addresses can only be returned by a 1714686cdd19SJun-ichiro itojun Hagino * Node Information proxy, since they represent 1715686cdd19SJun-ichiro itojun Hagino * addresses of IPv4-only nodes, which perforce do 1716686cdd19SJun-ichiro itojun Hagino * not implement this protocol. 171733841545SHajimu UMEMOTO * [icmp-name-lookups-07, Section 5.4] 1718686cdd19SJun-ichiro itojun Hagino * So we don't support NI_NODEADDR_FLAG_COMPAT in 1719686cdd19SJun-ichiro itojun Hagino * this function at this moment. 1720686cdd19SJun-ichiro itojun Hagino */ 1721686cdd19SJun-ichiro itojun Hagino 172282cd038dSYoshinobu Inoue /* What do we have to do about ::1? */ 172382cd038dSYoshinobu Inoue switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 172482cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_LINKLOCAL: 172533841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 172633841545SHajimu UMEMOTO continue; 172782cd038dSYoshinobu Inoue break; 172882cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_SITELOCAL: 172933841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 173033841545SHajimu UMEMOTO continue; 173182cd038dSYoshinobu Inoue break; 173282cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_GLOBAL: 173333841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 173433841545SHajimu UMEMOTO continue; 173582cd038dSYoshinobu Inoue break; 173682cd038dSYoshinobu Inoue default: 173782cd038dSYoshinobu Inoue continue; 173882cd038dSYoshinobu Inoue } 173933841545SHajimu UMEMOTO 174033841545SHajimu UMEMOTO /* 174133841545SHajimu UMEMOTO * check if anycast is okay. 174233841545SHajimu UMEMOTO * XXX: just experimental. not in the spec. 174333841545SHajimu UMEMOTO */ 174433841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 174533841545SHajimu UMEMOTO (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 174633841545SHajimu UMEMOTO continue; /* we need only unicast addresses */ 174733841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1748603724d3SBjoern A. Zeeb (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) { 174933841545SHajimu UMEMOTO continue; 175033841545SHajimu UMEMOTO } 175133841545SHajimu UMEMOTO addrsofif++; /* count the address */ 175282cd038dSYoshinobu Inoue } 17531e1d603eSRobert Watson IF_ADDR_UNLOCK(ifp); 175482cd038dSYoshinobu Inoue if (iffound) { 175582cd038dSYoshinobu Inoue *ifpp = ifp; 1756b30a244cSJeffrey Hsu IFNET_RUNLOCK(); 175782cd038dSYoshinobu Inoue return (addrsofif); 175882cd038dSYoshinobu Inoue } 175982cd038dSYoshinobu Inoue 176082cd038dSYoshinobu Inoue addrs += addrsofif; 176182cd038dSYoshinobu Inoue } 1762b30a244cSJeffrey Hsu IFNET_RUNLOCK(); 176382cd038dSYoshinobu Inoue 176482cd038dSYoshinobu Inoue return (addrs); 176582cd038dSYoshinobu Inoue } 176682cd038dSYoshinobu Inoue 176782cd038dSYoshinobu Inoue static int 17681272577eSXin LI ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6, 17691272577eSXin LI struct ifnet *ifp0, int resid) 177082cd038dSYoshinobu Inoue { 17718b615593SMarko Zec INIT_VNET_NET(curvnet); 17728b615593SMarko Zec INIT_VNET_INET6(curvnet); 1773603724d3SBjoern A. Zeeb struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&V_ifnet); 177433841545SHajimu UMEMOTO struct in6_ifaddr *ifa6; 177533841545SHajimu UMEMOTO struct ifaddr *ifa; 177633841545SHajimu UMEMOTO struct ifnet *ifp_dep = NULL; 177733841545SHajimu UMEMOTO int copied = 0, allow_deprecated = 0; 177882cd038dSYoshinobu Inoue u_char *cp = (u_char *)(nni6 + 1); 177933841545SHajimu UMEMOTO int niflags = ni6->ni_flags; 178033841545SHajimu UMEMOTO u_int32_t ltime; 178182cd038dSYoshinobu Inoue 178233841545SHajimu UMEMOTO if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 178382cd038dSYoshinobu Inoue return (0); /* needless to copy */ 178482cd038dSYoshinobu Inoue 1785b30a244cSJeffrey Hsu IFNET_RLOCK(); 178633841545SHajimu UMEMOTO again: 17870527d333SHajimu UMEMOTO 178806cd0a3fSHajimu UMEMOTO for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 17891e1d603eSRobert Watson IF_ADDR_LOCK(ifp); 1790c4dd3fe1SRobert Watson TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 179182cd038dSYoshinobu Inoue if (ifa->ifa_addr->sa_family != AF_INET6) 179282cd038dSYoshinobu Inoue continue; 179382cd038dSYoshinobu Inoue ifa6 = (struct in6_ifaddr *)ifa; 179482cd038dSYoshinobu Inoue 179533841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 179633841545SHajimu UMEMOTO allow_deprecated == 0) { 179733841545SHajimu UMEMOTO /* 179833841545SHajimu UMEMOTO * prefererred address should be put before 179933841545SHajimu UMEMOTO * deprecated addresses. 180033841545SHajimu UMEMOTO */ 180133841545SHajimu UMEMOTO 180233841545SHajimu UMEMOTO /* record the interface for later search */ 180333841545SHajimu UMEMOTO if (ifp_dep == NULL) 180433841545SHajimu UMEMOTO ifp_dep = ifp; 180533841545SHajimu UMEMOTO 180682cd038dSYoshinobu Inoue continue; 180706cd0a3fSHajimu UMEMOTO } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 180833841545SHajimu UMEMOTO allow_deprecated != 0) 180933841545SHajimu UMEMOTO continue; /* we now collect deprecated addrs */ 181082cd038dSYoshinobu Inoue 181182cd038dSYoshinobu Inoue /* What do we have to do about ::1? */ 181282cd038dSYoshinobu Inoue switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 181382cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_LINKLOCAL: 181433841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 181533841545SHajimu UMEMOTO continue; 181682cd038dSYoshinobu Inoue break; 181782cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_SITELOCAL: 181833841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 181933841545SHajimu UMEMOTO continue; 182082cd038dSYoshinobu Inoue break; 182182cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_GLOBAL: 182233841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 182333841545SHajimu UMEMOTO continue; 182482cd038dSYoshinobu Inoue break; 182582cd038dSYoshinobu Inoue default: 182682cd038dSYoshinobu Inoue continue; 182782cd038dSYoshinobu Inoue } 182882cd038dSYoshinobu Inoue 182933841545SHajimu UMEMOTO /* 183033841545SHajimu UMEMOTO * check if anycast is okay. 183133841545SHajimu UMEMOTO * XXX: just experimental. not in the spec. 183233841545SHajimu UMEMOTO */ 183333841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 183433841545SHajimu UMEMOTO (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 183533841545SHajimu UMEMOTO continue; 183633841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1837603724d3SBjoern A. Zeeb (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) { 183833841545SHajimu UMEMOTO continue; 183933841545SHajimu UMEMOTO } 184033841545SHajimu UMEMOTO 184133841545SHajimu UMEMOTO /* now we can copy the address */ 184233841545SHajimu UMEMOTO if (resid < sizeof(struct in6_addr) + 184333841545SHajimu UMEMOTO sizeof(u_int32_t)) { 18441e1d603eSRobert Watson IF_ADDR_UNLOCK(ifp); 184582cd038dSYoshinobu Inoue /* 184682cd038dSYoshinobu Inoue * We give up much more copy. 184782cd038dSYoshinobu Inoue * Set the truncate flag and return. 184882cd038dSYoshinobu Inoue */ 184906cd0a3fSHajimu UMEMOTO nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1850b30a244cSJeffrey Hsu IFNET_RUNLOCK(); 185182cd038dSYoshinobu Inoue return (copied); 185282cd038dSYoshinobu Inoue } 185333841545SHajimu UMEMOTO 185433841545SHajimu UMEMOTO /* 185533841545SHajimu UMEMOTO * Set the TTL of the address. 185633841545SHajimu UMEMOTO * The TTL value should be one of the following 185733841545SHajimu UMEMOTO * according to the specification: 185833841545SHajimu UMEMOTO * 185933841545SHajimu UMEMOTO * 1. The remaining lifetime of a DHCP lease on the 186033841545SHajimu UMEMOTO * address, or 186133841545SHajimu UMEMOTO * 2. The remaining Valid Lifetime of a prefix from 186233841545SHajimu UMEMOTO * which the address was derived through Stateless 186333841545SHajimu UMEMOTO * Autoconfiguration. 186433841545SHajimu UMEMOTO * 186533841545SHajimu UMEMOTO * Note that we currently do not support stateful 186633841545SHajimu UMEMOTO * address configuration by DHCPv6, so the former 186733841545SHajimu UMEMOTO * case can't happen. 186833841545SHajimu UMEMOTO */ 186933841545SHajimu UMEMOTO if (ifa6->ia6_lifetime.ia6t_expire == 0) 187033841545SHajimu UMEMOTO ltime = ND6_INFINITE_LIFETIME; 187133841545SHajimu UMEMOTO else { 187233841545SHajimu UMEMOTO if (ifa6->ia6_lifetime.ia6t_expire > 187333841545SHajimu UMEMOTO time_second) 187433841545SHajimu UMEMOTO ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second); 187533841545SHajimu UMEMOTO else 187633841545SHajimu UMEMOTO ltime = 0; 187733841545SHajimu UMEMOTO } 187833841545SHajimu UMEMOTO 187933841545SHajimu UMEMOTO bcopy(<ime, cp, sizeof(u_int32_t)); 188033841545SHajimu UMEMOTO cp += sizeof(u_int32_t); 188133841545SHajimu UMEMOTO 188233841545SHajimu UMEMOTO /* copy the address itself */ 188382cd038dSYoshinobu Inoue bcopy(&ifa6->ia_addr.sin6_addr, cp, 188482cd038dSYoshinobu Inoue sizeof(struct in6_addr)); 18859a4f9608SHajimu UMEMOTO in6_clearscope((struct in6_addr *)cp); /* XXX */ 188682cd038dSYoshinobu Inoue cp += sizeof(struct in6_addr); 188733841545SHajimu UMEMOTO 188833841545SHajimu UMEMOTO resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 188906cd0a3fSHajimu UMEMOTO copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 189082cd038dSYoshinobu Inoue } 18911e1d603eSRobert Watson IF_ADDR_UNLOCK(ifp); 189282cd038dSYoshinobu Inoue if (ifp0) /* we need search only on the specified IF */ 189382cd038dSYoshinobu Inoue break; 189482cd038dSYoshinobu Inoue } 189582cd038dSYoshinobu Inoue 189633841545SHajimu UMEMOTO if (allow_deprecated == 0 && ifp_dep != NULL) { 189733841545SHajimu UMEMOTO ifp = ifp_dep; 189833841545SHajimu UMEMOTO allow_deprecated = 1; 189933841545SHajimu UMEMOTO 190033841545SHajimu UMEMOTO goto again; 190133841545SHajimu UMEMOTO } 190233841545SHajimu UMEMOTO 1903b30a244cSJeffrey Hsu IFNET_RUNLOCK(); 1904b30a244cSJeffrey Hsu 190582cd038dSYoshinobu Inoue return (copied); 190682cd038dSYoshinobu Inoue } 190782cd038dSYoshinobu Inoue 190882cd038dSYoshinobu Inoue /* 190982cd038dSYoshinobu Inoue * XXX almost dup'ed code with rip6_input. 191082cd038dSYoshinobu Inoue */ 191182cd038dSYoshinobu Inoue static int 19121272577eSXin LI icmp6_rip6_input(struct mbuf **mp, int off) 191382cd038dSYoshinobu Inoue { 19148b615593SMarko Zec INIT_VNET_INET(curvnet); 19158b615593SMarko Zec INIT_VNET_INET6(curvnet); 191682cd038dSYoshinobu Inoue struct mbuf *m = *mp; 191733841545SHajimu UMEMOTO struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1918fc384fa5SBjoern A. Zeeb struct inpcb *in6p; 1919fc384fa5SBjoern A. Zeeb struct inpcb *last = NULL; 19209a4f9608SHajimu UMEMOTO struct sockaddr_in6 fromsa; 192182cd038dSYoshinobu Inoue struct icmp6_hdr *icmp6; 192282cd038dSYoshinobu Inoue struct mbuf *opts = NULL; 192382cd038dSYoshinobu Inoue 1924686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 192582cd038dSYoshinobu Inoue /* this is assumed to be safe. */ 192682cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 1927686cdd19SJun-ichiro itojun Hagino #else 1928686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1929686cdd19SJun-ichiro itojun Hagino if (icmp6 == NULL) { 1930686cdd19SJun-ichiro itojun Hagino /* m is already reclaimed */ 193106cd0a3fSHajimu UMEMOTO return (IPPROTO_DONE); 1932686cdd19SJun-ichiro itojun Hagino } 1933686cdd19SJun-ichiro itojun Hagino #endif 193482cd038dSYoshinobu Inoue 1935a1f7e5f8SHajimu UMEMOTO /* 1936a1f7e5f8SHajimu UMEMOTO * XXX: the address may have embedded scope zone ID, which should be 1937a1f7e5f8SHajimu UMEMOTO * hidden from applications. 1938a1f7e5f8SHajimu UMEMOTO */ 19399a4f9608SHajimu UMEMOTO bzero(&fromsa, sizeof(fromsa)); 19409a4f9608SHajimu UMEMOTO fromsa.sin6_family = AF_INET6; 1941a1f7e5f8SHajimu UMEMOTO fromsa.sin6_len = sizeof(struct sockaddr_in6); 1942a1f7e5f8SHajimu UMEMOTO fromsa.sin6_addr = ip6->ip6_src; 1943a1f7e5f8SHajimu UMEMOTO if (sa6_recoverscope(&fromsa)) { 1944a1f7e5f8SHajimu UMEMOTO m_freem(m); 1945a1f7e5f8SHajimu UMEMOTO return (IPPROTO_DONE); 1946a1f7e5f8SHajimu UMEMOTO } 194782cd038dSYoshinobu Inoue 1948603724d3SBjoern A. Zeeb INP_INFO_RLOCK(&V_ripcbinfo); 1949603724d3SBjoern A. Zeeb LIST_FOREACH(in6p, &V_ripcb, inp_list) { 1950b11e21aeSAlexander Motin if ((in6p->inp_vflag & INP_IPV6) == 0) 195182cd038dSYoshinobu Inoue continue; 1952fc384fa5SBjoern A. Zeeb if (in6p->inp_ip_p != IPPROTO_ICMPV6) 1953b11e21aeSAlexander Motin continue; 195482cd038dSYoshinobu Inoue if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 195582cd038dSYoshinobu Inoue !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1956b11e21aeSAlexander Motin continue; 195782cd038dSYoshinobu Inoue if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 195882cd038dSYoshinobu Inoue !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1959b11e21aeSAlexander Motin continue; 19606c5bbf5cSAlexander Motin INP_RLOCK(in6p); 19612f1ff0cdSRobert Watson if (ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 19626c5bbf5cSAlexander Motin in6p->in6p_icmp6filt)) { 19636c5bbf5cSAlexander Motin INP_RUNLOCK(in6p); 1964b11e21aeSAlexander Motin continue; 19656c5bbf5cSAlexander Motin } 1966aba53ef0SKip Macy if (last != NULL) { 1967657db3c8SHajimu UMEMOTO struct mbuf *n = NULL; 1968657db3c8SHajimu UMEMOTO 1969657db3c8SHajimu UMEMOTO /* 1970657db3c8SHajimu UMEMOTO * Recent network drivers tend to allocate a single 1971657db3c8SHajimu UMEMOTO * mbuf cluster, rather than to make a couple of 1972657db3c8SHajimu UMEMOTO * mbufs without clusters. Also, since the IPv6 code 1973657db3c8SHajimu UMEMOTO * path tries to avoid m_pullup(), it is highly 1974657db3c8SHajimu UMEMOTO * probable that we still have an mbuf cluster here 1975657db3c8SHajimu UMEMOTO * even though the necessary length can be stored in an 1976657db3c8SHajimu UMEMOTO * mbuf's internal buffer. 1977657db3c8SHajimu UMEMOTO * Meanwhile, the default size of the receive socket 1978657db3c8SHajimu UMEMOTO * buffer for raw sockets is not so large. This means 1979657db3c8SHajimu UMEMOTO * the possibility of packet loss is relatively higher 1980657db3c8SHajimu UMEMOTO * than before. To avoid this scenario, we copy the 1981657db3c8SHajimu UMEMOTO * received data to a separate mbuf that does not use 1982657db3c8SHajimu UMEMOTO * a cluster, if possible. 1983657db3c8SHajimu UMEMOTO * XXX: it is better to copy the data after stripping 1984657db3c8SHajimu UMEMOTO * intermediate headers. 1985657db3c8SHajimu UMEMOTO */ 1986657db3c8SHajimu UMEMOTO if ((m->m_flags & M_EXT) && m->m_next == NULL && 1987657db3c8SHajimu UMEMOTO m->m_len <= MHLEN) { 1988657db3c8SHajimu UMEMOTO MGET(n, M_DONTWAIT, m->m_type); 1989657db3c8SHajimu UMEMOTO if (n != NULL) { 1990c543ec4eSGeorge V. Neville-Neil if (m_dup_pkthdr(n, m, M_NOWAIT)) { 1991c543ec4eSGeorge V. Neville-Neil bcopy(m->m_data, n->m_data, 1992c543ec4eSGeorge V. Neville-Neil m->m_len); 1993657db3c8SHajimu UMEMOTO n->m_len = m->m_len; 1994c543ec4eSGeorge V. Neville-Neil } else { 1995c543ec4eSGeorge V. Neville-Neil m_free(n); 1996c543ec4eSGeorge V. Neville-Neil n = NULL; 1997c543ec4eSGeorge V. Neville-Neil } 1998657db3c8SHajimu UMEMOTO } 1999657db3c8SHajimu UMEMOTO } 2000657db3c8SHajimu UMEMOTO if (n != NULL || 2001657db3c8SHajimu UMEMOTO (n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 200297590249SBjoern A. Zeeb if (last->inp_flags & INP_CONTROLOPTS) 200311de19f4SHajimu UMEMOTO ip6_savecontrol(last, n, &opts); 200482cd038dSYoshinobu Inoue /* strip intermediate headers */ 200582cd038dSYoshinobu Inoue m_adj(n, off); 2006fc384fa5SBjoern A. Zeeb SOCKBUF_LOCK(&last->inp_socket->so_rcv); 2007c9db0fadSRobert Watson if (sbappendaddr_locked( 2008fc384fa5SBjoern A. Zeeb &last->inp_socket->so_rcv, 20099a4f9608SHajimu UMEMOTO (struct sockaddr *)&fromsa, n, opts) 201006cd0a3fSHajimu UMEMOTO == 0) { 201182cd038dSYoshinobu Inoue /* should notify about lost packet */ 201282cd038dSYoshinobu Inoue m_freem(n); 201333841545SHajimu UMEMOTO if (opts) { 201482cd038dSYoshinobu Inoue m_freem(opts); 201533841545SHajimu UMEMOTO } 2016c9db0fadSRobert Watson SOCKBUF_UNLOCK( 2017fc384fa5SBjoern A. Zeeb &last->inp_socket->so_rcv); 20184cc20ab1SSeigo Tanimura } else 2019fc384fa5SBjoern A. Zeeb sorwakeup_locked(last->inp_socket); 202082cd038dSYoshinobu Inoue opts = NULL; 202182cd038dSYoshinobu Inoue } 2022bb145f60SRobert Watson INP_RUNLOCK(last); 202382cd038dSYoshinobu Inoue } 202482cd038dSYoshinobu Inoue last = in6p; 202582cd038dSYoshinobu Inoue } 2026603724d3SBjoern A. Zeeb INP_INFO_RUNLOCK(&V_ripcbinfo); 2027aba53ef0SKip Macy if (last != NULL) { 202897590249SBjoern A. Zeeb if (last->inp_flags & INP_CONTROLOPTS) 202911de19f4SHajimu UMEMOTO ip6_savecontrol(last, m, &opts); 203082cd038dSYoshinobu Inoue /* strip intermediate headers */ 203182cd038dSYoshinobu Inoue m_adj(m, off); 2032657db3c8SHajimu UMEMOTO 2033657db3c8SHajimu UMEMOTO /* avoid using mbuf clusters if possible (see above) */ 2034657db3c8SHajimu UMEMOTO if ((m->m_flags & M_EXT) && m->m_next == NULL && 2035657db3c8SHajimu UMEMOTO m->m_len <= MHLEN) { 2036657db3c8SHajimu UMEMOTO struct mbuf *n; 2037657db3c8SHajimu UMEMOTO 2038657db3c8SHajimu UMEMOTO MGET(n, M_DONTWAIT, m->m_type); 2039657db3c8SHajimu UMEMOTO if (n != NULL) { 2040c543ec4eSGeorge V. Neville-Neil if (m_dup_pkthdr(n, m, M_NOWAIT)) { 2041657db3c8SHajimu UMEMOTO bcopy(m->m_data, n->m_data, m->m_len); 2042657db3c8SHajimu UMEMOTO n->m_len = m->m_len; 2043657db3c8SHajimu UMEMOTO 2044657db3c8SHajimu UMEMOTO m_freem(m); 2045657db3c8SHajimu UMEMOTO m = n; 2046c543ec4eSGeorge V. Neville-Neil } else { 2047c543ec4eSGeorge V. Neville-Neil m_freem(n); 2048c543ec4eSGeorge V. Neville-Neil n = NULL; 2049c543ec4eSGeorge V. Neville-Neil } 2050657db3c8SHajimu UMEMOTO } 2051657db3c8SHajimu UMEMOTO } 2052fc384fa5SBjoern A. Zeeb SOCKBUF_LOCK(&last->inp_socket->so_rcv); 2053fc384fa5SBjoern A. Zeeb if (sbappendaddr_locked(&last->inp_socket->so_rcv, 20549a4f9608SHajimu UMEMOTO (struct sockaddr *)&fromsa, m, opts) == 0) { 205582cd038dSYoshinobu Inoue m_freem(m); 205682cd038dSYoshinobu Inoue if (opts) 205782cd038dSYoshinobu Inoue m_freem(opts); 2058fc384fa5SBjoern A. Zeeb SOCKBUF_UNLOCK(&last->inp_socket->so_rcv); 20594cc20ab1SSeigo Tanimura } else 2060fc384fa5SBjoern A. Zeeb sorwakeup_locked(last->inp_socket); 2061bb145f60SRobert Watson INP_RUNLOCK(last); 206282cd038dSYoshinobu Inoue } else { 206382cd038dSYoshinobu Inoue m_freem(m); 206433cde130SBruce M Simpson IP6STAT_DEC(ip6s_delivered); 206582cd038dSYoshinobu Inoue } 206682cd038dSYoshinobu Inoue return IPPROTO_DONE; 206782cd038dSYoshinobu Inoue } 206882cd038dSYoshinobu Inoue 206982cd038dSYoshinobu Inoue /* 207082cd038dSYoshinobu Inoue * Reflect the ip6 packet back to the source. 2071686cdd19SJun-ichiro itojun Hagino * OFF points to the icmp6 header, counted from the top of the mbuf. 207282cd038dSYoshinobu Inoue */ 207382cd038dSYoshinobu Inoue void 20741272577eSXin LI icmp6_reflect(struct mbuf *m, size_t off) 207582cd038dSYoshinobu Inoue { 20768b615593SMarko Zec INIT_VNET_INET6(curvnet); 2077686cdd19SJun-ichiro itojun Hagino struct ip6_hdr *ip6; 207882cd038dSYoshinobu Inoue struct icmp6_hdr *icmp6; 20798c0fec80SRobert Watson struct in6_ifaddr *ia = NULL; 2080686cdd19SJun-ichiro itojun Hagino int plen; 208182cd038dSYoshinobu Inoue int type, code; 208282cd038dSYoshinobu Inoue struct ifnet *outif = NULL; 2083a1f7e5f8SHajimu UMEMOTO struct in6_addr origdst, *src = NULL; 208482cd038dSYoshinobu Inoue 2085686cdd19SJun-ichiro itojun Hagino /* too short to reflect */ 2086686cdd19SJun-ichiro itojun Hagino if (off < sizeof(struct ip6_hdr)) { 208733841545SHajimu UMEMOTO nd6log((LOG_DEBUG, 208833841545SHajimu UMEMOTO "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2089686cdd19SJun-ichiro itojun Hagino (u_long)off, (u_long)sizeof(struct ip6_hdr), 209033841545SHajimu UMEMOTO __FILE__, __LINE__)); 2091686cdd19SJun-ichiro itojun Hagino goto bad; 2092686cdd19SJun-ichiro itojun Hagino } 2093686cdd19SJun-ichiro itojun Hagino 209482cd038dSYoshinobu Inoue /* 209582cd038dSYoshinobu Inoue * If there are extra headers between IPv6 and ICMPv6, strip 209682cd038dSYoshinobu Inoue * off that header first. 209782cd038dSYoshinobu Inoue */ 2098686cdd19SJun-ichiro itojun Hagino #ifdef DIAGNOSTIC 2099686cdd19SJun-ichiro itojun Hagino if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2100686cdd19SJun-ichiro itojun Hagino panic("assumption failed in icmp6_reflect"); 2101686cdd19SJun-ichiro itojun Hagino #endif 2102686cdd19SJun-ichiro itojun Hagino if (off > sizeof(struct ip6_hdr)) { 2103686cdd19SJun-ichiro itojun Hagino size_t l; 2104686cdd19SJun-ichiro itojun Hagino struct ip6_hdr nip6; 210582cd038dSYoshinobu Inoue 2106686cdd19SJun-ichiro itojun Hagino l = off - sizeof(struct ip6_hdr); 2107686cdd19SJun-ichiro itojun Hagino m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 2108686cdd19SJun-ichiro itojun Hagino m_adj(m, l); 2109686cdd19SJun-ichiro itojun Hagino l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2110686cdd19SJun-ichiro itojun Hagino if (m->m_len < l) { 2111686cdd19SJun-ichiro itojun Hagino if ((m = m_pullup(m, l)) == NULL) 2112686cdd19SJun-ichiro itojun Hagino return; 211382cd038dSYoshinobu Inoue } 2114686cdd19SJun-ichiro itojun Hagino bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 2115686cdd19SJun-ichiro itojun Hagino } else /* off == sizeof(struct ip6_hdr) */ { 2116686cdd19SJun-ichiro itojun Hagino size_t l; 2117686cdd19SJun-ichiro itojun Hagino l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2118686cdd19SJun-ichiro itojun Hagino if (m->m_len < l) { 2119686cdd19SJun-ichiro itojun Hagino if ((m = m_pullup(m, l)) == NULL) 2120686cdd19SJun-ichiro itojun Hagino return; 212182cd038dSYoshinobu Inoue } 2122686cdd19SJun-ichiro itojun Hagino } 2123686cdd19SJun-ichiro itojun Hagino plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 212482cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 212582cd038dSYoshinobu Inoue ip6->ip6_nxt = IPPROTO_ICMPV6; 212682cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)(ip6 + 1); 212782cd038dSYoshinobu Inoue type = icmp6->icmp6_type; /* keep type for statistics */ 212882cd038dSYoshinobu Inoue code = icmp6->icmp6_code; /* ditto. */ 212982cd038dSYoshinobu Inoue 2130a1f7e5f8SHajimu UMEMOTO origdst = ip6->ip6_dst; 213182cd038dSYoshinobu Inoue /* 213282cd038dSYoshinobu Inoue * ip6_input() drops a packet if its src is multicast. 213382cd038dSYoshinobu Inoue * So, the src is never multicast. 213482cd038dSYoshinobu Inoue */ 213582cd038dSYoshinobu Inoue ip6->ip6_dst = ip6->ip6_src; 213682cd038dSYoshinobu Inoue 213782cd038dSYoshinobu Inoue /* 213882cd038dSYoshinobu Inoue * If the incoming packet was addressed directly to us (i.e. unicast), 213982cd038dSYoshinobu Inoue * use dst as the src for the reply. 214006cd0a3fSHajimu UMEMOTO * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2141686cdd19SJun-ichiro itojun Hagino * (for example) when we encounter an error while forwarding procedure 2142686cdd19SJun-ichiro itojun Hagino * destined to a duplicated address of ours. 2143a1f7e5f8SHajimu UMEMOTO * Note that ip6_getdstifaddr() may fail if we are in an error handling 2144a1f7e5f8SHajimu UMEMOTO * procedure of an outgoing packet of our own, in which case we need 2145a1f7e5f8SHajimu UMEMOTO * to search in the ifaddr list. 214682cd038dSYoshinobu Inoue */ 2147a1f7e5f8SHajimu UMEMOTO if (!IN6_IS_ADDR_MULTICAST(&origdst)) { 2148a1f7e5f8SHajimu UMEMOTO if ((ia = ip6_getdstifaddr(m))) { 2149a1f7e5f8SHajimu UMEMOTO if (!(ia->ia6_flags & 2150a1f7e5f8SHajimu UMEMOTO (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) 2151a1f7e5f8SHajimu UMEMOTO src = &ia->ia_addr.sin6_addr; 2152a1f7e5f8SHajimu UMEMOTO } else { 2153a1f7e5f8SHajimu UMEMOTO struct sockaddr_in6 d; 2154a1f7e5f8SHajimu UMEMOTO 2155a1f7e5f8SHajimu UMEMOTO bzero(&d, sizeof(d)); 2156a1f7e5f8SHajimu UMEMOTO d.sin6_family = AF_INET6; 2157a1f7e5f8SHajimu UMEMOTO d.sin6_len = sizeof(d); 2158a1f7e5f8SHajimu UMEMOTO d.sin6_addr = origdst; 2159a1f7e5f8SHajimu UMEMOTO ia = (struct in6_ifaddr *) 2160a1f7e5f8SHajimu UMEMOTO ifa_ifwithaddr((struct sockaddr *)&d); 2161a1f7e5f8SHajimu UMEMOTO if (ia && 2162a1f7e5f8SHajimu UMEMOTO !(ia->ia6_flags & 2163a1f7e5f8SHajimu UMEMOTO (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) { 2164a1f7e5f8SHajimu UMEMOTO src = &ia->ia_addr.sin6_addr; 216582cd038dSYoshinobu Inoue } 2166a1f7e5f8SHajimu UMEMOTO } 216782cd038dSYoshinobu Inoue } 216882cd038dSYoshinobu Inoue 2169a1f7e5f8SHajimu UMEMOTO if (src == NULL) { 217033841545SHajimu UMEMOTO int e; 2171a1f7e5f8SHajimu UMEMOTO struct sockaddr_in6 sin6; 217233841545SHajimu UMEMOTO struct route_in6 ro; 217333841545SHajimu UMEMOTO 217482cd038dSYoshinobu Inoue /* 2175686cdd19SJun-ichiro itojun Hagino * This case matches to multicasts, our anycast, or unicasts 217633841545SHajimu UMEMOTO * that we do not own. Select a source address based on the 217733841545SHajimu UMEMOTO * source address of the erroneous packet. 217882cd038dSYoshinobu Inoue */ 2179a1f7e5f8SHajimu UMEMOTO bzero(&sin6, sizeof(sin6)); 2180a1f7e5f8SHajimu UMEMOTO sin6.sin6_family = AF_INET6; 2181a1f7e5f8SHajimu UMEMOTO sin6.sin6_len = sizeof(sin6); 2182a1f7e5f8SHajimu UMEMOTO sin6.sin6_addr = ip6->ip6_dst; /* zone ID should be embedded */ 2183a1f7e5f8SHajimu UMEMOTO 218433841545SHajimu UMEMOTO bzero(&ro, sizeof(ro)); 2185a1f7e5f8SHajimu UMEMOTO src = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, &outif, &e); 218633841545SHajimu UMEMOTO if (ro.ro_rt) 218733841545SHajimu UMEMOTO RTFREE(ro.ro_rt); /* XXX: we could use this */ 218833841545SHajimu UMEMOTO if (src == NULL) { 21891d54aa3bSBjoern A. Zeeb char ip6buf[INET6_ADDRSTRLEN]; 219033841545SHajimu UMEMOTO nd6log((LOG_DEBUG, 219133841545SHajimu UMEMOTO "icmp6_reflect: source can't be determined: " 219233841545SHajimu UMEMOTO "dst=%s, error=%d\n", 21931d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6buf, &sin6.sin6_addr), e)); 219482cd038dSYoshinobu Inoue goto bad; 219533841545SHajimu UMEMOTO } 219633841545SHajimu UMEMOTO } 219782cd038dSYoshinobu Inoue 219882cd038dSYoshinobu Inoue ip6->ip6_src = *src; 219982cd038dSYoshinobu Inoue ip6->ip6_flow = 0; 2200686cdd19SJun-ichiro itojun Hagino ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2201686cdd19SJun-ichiro itojun Hagino ip6->ip6_vfc |= IPV6_VERSION; 220282cd038dSYoshinobu Inoue ip6->ip6_nxt = IPPROTO_ICMPV6; 2203f95d4633SHajimu UMEMOTO if (outif) 2204f95d4633SHajimu UMEMOTO ip6->ip6_hlim = ND_IFINFO(outif)->chlim; 2205f95d4633SHajimu UMEMOTO else if (m->m_pkthdr.rcvif) { 220682cd038dSYoshinobu Inoue /* XXX: This may not be the outgoing interface */ 220731b1bfe1SHajimu UMEMOTO ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim; 220833841545SHajimu UMEMOTO } else 2209603724d3SBjoern A. Zeeb ip6->ip6_hlim = V_ip6_defhlim; 221082cd038dSYoshinobu Inoue 221182cd038dSYoshinobu Inoue icmp6->icmp6_cksum = 0; 221282cd038dSYoshinobu Inoue icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 221382cd038dSYoshinobu Inoue sizeof(struct ip6_hdr), plen); 221482cd038dSYoshinobu Inoue 221582cd038dSYoshinobu Inoue /* 221633841545SHajimu UMEMOTO * XXX option handling 221782cd038dSYoshinobu Inoue */ 221882cd038dSYoshinobu Inoue 221982cd038dSYoshinobu Inoue m->m_flags &= ~(M_BCAST|M_MCAST); 222082cd038dSYoshinobu Inoue 22215d846453SSam Leffler ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 222282cd038dSYoshinobu Inoue if (outif) 222382cd038dSYoshinobu Inoue icmp6_ifoutstat_inc(outif, type, code); 222482cd038dSYoshinobu Inoue 22258c0fec80SRobert Watson if (ia != NULL) 22268c0fec80SRobert Watson ifa_free(&ia->ia_ifa); 222782cd038dSYoshinobu Inoue return; 222882cd038dSYoshinobu Inoue 222982cd038dSYoshinobu Inoue bad: 22308c0fec80SRobert Watson if (ia != NULL) 22318c0fec80SRobert Watson ifa_free(&ia->ia_ifa); 223282cd038dSYoshinobu Inoue m_freem(m); 223382cd038dSYoshinobu Inoue return; 223482cd038dSYoshinobu Inoue } 223582cd038dSYoshinobu Inoue 223682cd038dSYoshinobu Inoue void 22371272577eSXin LI icmp6_fasttimo(void) 223882cd038dSYoshinobu Inoue { 2239686cdd19SJun-ichiro itojun Hagino 224033cde130SBruce M Simpson mld_fasttimo(); 224133cde130SBruce M Simpson } 224233cde130SBruce M Simpson 224333cde130SBruce M Simpson void 224433cde130SBruce M Simpson icmp6_slowtimo(void) 224533cde130SBruce M Simpson { 224633cde130SBruce M Simpson 224733cde130SBruce M Simpson mld_slowtimo(); 224882cd038dSYoshinobu Inoue } 224982cd038dSYoshinobu Inoue 225082cd038dSYoshinobu Inoue static const char * 22511272577eSXin LI icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6, 22521272577eSXin LI struct in6_addr *tgt6) 225382cd038dSYoshinobu Inoue { 225482cd038dSYoshinobu Inoue static char buf[1024]; 22551d54aa3bSBjoern A. Zeeb char ip6bufs[INET6_ADDRSTRLEN]; 22561d54aa3bSBjoern A. Zeeb char ip6bufd[INET6_ADDRSTRLEN]; 22571d54aa3bSBjoern A. Zeeb char ip6buft[INET6_ADDRSTRLEN]; 225882cd038dSYoshinobu Inoue snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 22591d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6), 22601d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6buft, tgt6)); 226182cd038dSYoshinobu Inoue return buf; 226282cd038dSYoshinobu Inoue } 226382cd038dSYoshinobu Inoue 226482cd038dSYoshinobu Inoue void 22651272577eSXin LI icmp6_redirect_input(struct mbuf *m, int off) 226682cd038dSYoshinobu Inoue { 22678b615593SMarko Zec INIT_VNET_INET6(curvnet); 22682cb64cb2SGeorge V. Neville-Neil struct ifnet *ifp; 226982cd038dSYoshinobu Inoue struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2270686cdd19SJun-ichiro itojun Hagino struct nd_redirect *nd_rd; 227182cd038dSYoshinobu Inoue int icmp6len = ntohs(ip6->ip6_plen); 227282cd038dSYoshinobu Inoue char *lladdr = NULL; 227382cd038dSYoshinobu Inoue int lladdrlen = 0; 227482cd038dSYoshinobu Inoue u_char *redirhdr = NULL; 227582cd038dSYoshinobu Inoue int redirhdrlen = 0; 227682cd038dSYoshinobu Inoue struct rtentry *rt = NULL; 227782cd038dSYoshinobu Inoue int is_router; 227882cd038dSYoshinobu Inoue int is_onlink; 227982cd038dSYoshinobu Inoue struct in6_addr src6 = ip6->ip6_src; 2280686cdd19SJun-ichiro itojun Hagino struct in6_addr redtgt6; 2281686cdd19SJun-ichiro itojun Hagino struct in6_addr reddst6; 228282cd038dSYoshinobu Inoue union nd_opts ndopts; 22831d54aa3bSBjoern A. Zeeb char ip6buf[INET6_ADDRSTRLEN]; 228482cd038dSYoshinobu Inoue 22852cb64cb2SGeorge V. Neville-Neil if (!m) 22862cb64cb2SGeorge V. Neville-Neil return; 22872cb64cb2SGeorge V. Neville-Neil 22882cb64cb2SGeorge V. Neville-Neil ifp = m->m_pkthdr.rcvif; 22892cb64cb2SGeorge V. Neville-Neil 22902cb64cb2SGeorge V. Neville-Neil if (!ifp) 229182cd038dSYoshinobu Inoue return; 229282cd038dSYoshinobu Inoue 229382cd038dSYoshinobu Inoue /* XXX if we are router, we don't update route by icmp6 redirect */ 2294603724d3SBjoern A. Zeeb if (V_ip6_forwarding) 2295686cdd19SJun-ichiro itojun Hagino goto freeit; 2296603724d3SBjoern A. Zeeb if (!V_icmp6_rediraccept) 2297686cdd19SJun-ichiro itojun Hagino goto freeit; 2298686cdd19SJun-ichiro itojun Hagino 2299686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 2300686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_CHECK(m, off, icmp6len,); 2301686cdd19SJun-ichiro itojun Hagino nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 2302686cdd19SJun-ichiro itojun Hagino #else 2303686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2304686cdd19SJun-ichiro itojun Hagino if (nd_rd == NULL) { 2305e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 230682cd038dSYoshinobu Inoue return; 2307686cdd19SJun-ichiro itojun Hagino } 2308686cdd19SJun-ichiro itojun Hagino #endif 2309686cdd19SJun-ichiro itojun Hagino redtgt6 = nd_rd->nd_rd_target; 2310686cdd19SJun-ichiro itojun Hagino reddst6 = nd_rd->nd_rd_dst; 231182cd038dSYoshinobu Inoue 2312a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) || 2313a1f7e5f8SHajimu UMEMOTO in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) { 2314a1f7e5f8SHajimu UMEMOTO goto freeit; 2315a1f7e5f8SHajimu UMEMOTO } 231682cd038dSYoshinobu Inoue 231782cd038dSYoshinobu Inoue /* validation */ 231882cd038dSYoshinobu Inoue if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 231933841545SHajimu UMEMOTO nd6log((LOG_ERR, 232082cd038dSYoshinobu Inoue "ICMP6 redirect sent from %s rejected; " 232106cd0a3fSHajimu UMEMOTO "must be from linklocal\n", 23221d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6buf, &src6))); 232333841545SHajimu UMEMOTO goto bad; 232482cd038dSYoshinobu Inoue } 232582cd038dSYoshinobu Inoue if (ip6->ip6_hlim != 255) { 232633841545SHajimu UMEMOTO nd6log((LOG_ERR, 232782cd038dSYoshinobu Inoue "ICMP6 redirect sent from %s rejected; " 232882cd038dSYoshinobu Inoue "hlim=%d (must be 255)\n", 23291d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim)); 233033841545SHajimu UMEMOTO goto bad; 233182cd038dSYoshinobu Inoue } 233282cd038dSYoshinobu Inoue { 233382cd038dSYoshinobu Inoue /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 233482cd038dSYoshinobu Inoue struct sockaddr_in6 sin6; 233582cd038dSYoshinobu Inoue struct in6_addr *gw6; 233682cd038dSYoshinobu Inoue 233782cd038dSYoshinobu Inoue bzero(&sin6, sizeof(sin6)); 233882cd038dSYoshinobu Inoue sin6.sin6_family = AF_INET6; 233982cd038dSYoshinobu Inoue sin6.sin6_len = sizeof(struct sockaddr_in6); 234082cd038dSYoshinobu Inoue bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 234182cd038dSYoshinobu Inoue rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 234282cd038dSYoshinobu Inoue if (rt) { 2343deebc913SHajimu UMEMOTO if (rt->rt_gateway == NULL || 2344deebc913SHajimu UMEMOTO rt->rt_gateway->sa_family != AF_INET6) { 234533841545SHajimu UMEMOTO nd6log((LOG_ERR, 2346deebc913SHajimu UMEMOTO "ICMP6 redirect rejected; no route " 2347deebc913SHajimu UMEMOTO "with inet6 gateway found for redirect dst: %s\n", 234833841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2349d1dd20beSSam Leffler RTFREE_LOCKED(rt); 235033841545SHajimu UMEMOTO goto bad; 2351deebc913SHajimu UMEMOTO } 2352deebc913SHajimu UMEMOTO 235382cd038dSYoshinobu Inoue gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 235482cd038dSYoshinobu Inoue if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 235533841545SHajimu UMEMOTO nd6log((LOG_ERR, 235682cd038dSYoshinobu Inoue "ICMP6 redirect rejected; " 235782cd038dSYoshinobu Inoue "not equal to gw-for-src=%s (must be same): " 235882cd038dSYoshinobu Inoue "%s\n", 23591d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6buf, gw6), 236033841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2361d1dd20beSSam Leffler RTFREE_LOCKED(rt); 236233841545SHajimu UMEMOTO goto bad; 236382cd038dSYoshinobu Inoue } 236482cd038dSYoshinobu Inoue } else { 236533841545SHajimu UMEMOTO nd6log((LOG_ERR, 236682cd038dSYoshinobu Inoue "ICMP6 redirect rejected; " 236782cd038dSYoshinobu Inoue "no route found for redirect dst: %s\n", 236833841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 236933841545SHajimu UMEMOTO goto bad; 237082cd038dSYoshinobu Inoue } 2371d1dd20beSSam Leffler RTFREE_LOCKED(rt); 237282cd038dSYoshinobu Inoue rt = NULL; 237382cd038dSYoshinobu Inoue } 237482cd038dSYoshinobu Inoue if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 237533841545SHajimu UMEMOTO nd6log((LOG_ERR, 237682cd038dSYoshinobu Inoue "ICMP6 redirect rejected; " 237782cd038dSYoshinobu Inoue "redirect dst must be unicast: %s\n", 237833841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 237933841545SHajimu UMEMOTO goto bad; 238082cd038dSYoshinobu Inoue } 238182cd038dSYoshinobu Inoue 238282cd038dSYoshinobu Inoue is_router = is_onlink = 0; 238382cd038dSYoshinobu Inoue if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 238482cd038dSYoshinobu Inoue is_router = 1; /* router case */ 238582cd038dSYoshinobu Inoue if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 238682cd038dSYoshinobu Inoue is_onlink = 1; /* on-link destination case */ 238782cd038dSYoshinobu Inoue if (!is_router && !is_onlink) { 238833841545SHajimu UMEMOTO nd6log((LOG_ERR, 238982cd038dSYoshinobu Inoue "ICMP6 redirect rejected; " 239082cd038dSYoshinobu Inoue "neither router case nor onlink case: %s\n", 239133841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 239233841545SHajimu UMEMOTO goto bad; 239382cd038dSYoshinobu Inoue } 239482cd038dSYoshinobu Inoue /* validation passed */ 239582cd038dSYoshinobu Inoue 239682cd038dSYoshinobu Inoue icmp6len -= sizeof(*nd_rd); 239782cd038dSYoshinobu Inoue nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 239882cd038dSYoshinobu Inoue if (nd6_options(&ndopts) < 0) { 239933841545SHajimu UMEMOTO nd6log((LOG_INFO, "icmp6_redirect_input: " 240082cd038dSYoshinobu Inoue "invalid ND option, rejected: %s\n", 240133841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 240233841545SHajimu UMEMOTO /* nd6_options have incremented stats */ 2403686cdd19SJun-ichiro itojun Hagino goto freeit; 240482cd038dSYoshinobu Inoue } 240582cd038dSYoshinobu Inoue 240682cd038dSYoshinobu Inoue if (ndopts.nd_opts_tgt_lladdr) { 240782cd038dSYoshinobu Inoue lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 240882cd038dSYoshinobu Inoue lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 240982cd038dSYoshinobu Inoue } 241082cd038dSYoshinobu Inoue 241182cd038dSYoshinobu Inoue if (ndopts.nd_opts_rh) { 241282cd038dSYoshinobu Inoue redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 241382cd038dSYoshinobu Inoue redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 241482cd038dSYoshinobu Inoue } 241582cd038dSYoshinobu Inoue 241682cd038dSYoshinobu Inoue if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 241733841545SHajimu UMEMOTO nd6log((LOG_INFO, 241882cd038dSYoshinobu Inoue "icmp6_redirect_input: lladdrlen mismatch for %s " 241982cd038dSYoshinobu Inoue "(if %d, icmp6 packet %d): %s\n", 24201d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6buf, &redtgt6), 24211d54aa3bSBjoern A. Zeeb ifp->if_addrlen, lladdrlen - 2, 242233841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 242333841545SHajimu UMEMOTO goto bad; 242482cd038dSYoshinobu Inoue } 242582cd038dSYoshinobu Inoue 242682cd038dSYoshinobu Inoue /* RFC 2461 8.3 */ 242782cd038dSYoshinobu Inoue nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 242882cd038dSYoshinobu Inoue is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 242982cd038dSYoshinobu Inoue 243082cd038dSYoshinobu Inoue if (!is_onlink) { /* better router case. perform rtredirect. */ 243182cd038dSYoshinobu Inoue /* perform rtredirect */ 243282cd038dSYoshinobu Inoue struct sockaddr_in6 sdst; 243382cd038dSYoshinobu Inoue struct sockaddr_in6 sgw; 243482cd038dSYoshinobu Inoue struct sockaddr_in6 ssrc; 243582cd038dSYoshinobu Inoue 243682cd038dSYoshinobu Inoue bzero(&sdst, sizeof(sdst)); 243782cd038dSYoshinobu Inoue bzero(&sgw, sizeof(sgw)); 243882cd038dSYoshinobu Inoue bzero(&ssrc, sizeof(ssrc)); 243982cd038dSYoshinobu Inoue sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 244082cd038dSYoshinobu Inoue sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 244182cd038dSYoshinobu Inoue sizeof(struct sockaddr_in6); 244282cd038dSYoshinobu Inoue bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 244382cd038dSYoshinobu Inoue bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 244482cd038dSYoshinobu Inoue bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 244582cd038dSYoshinobu Inoue rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 244682cd038dSYoshinobu Inoue (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 2447d1dd20beSSam Leffler (struct sockaddr *)&ssrc); 244882cd038dSYoshinobu Inoue } 244982cd038dSYoshinobu Inoue /* finally update cached route in each socket via pfctlinput */ 245082cd038dSYoshinobu Inoue { 245182cd038dSYoshinobu Inoue struct sockaddr_in6 sdst; 245282cd038dSYoshinobu Inoue 245382cd038dSYoshinobu Inoue bzero(&sdst, sizeof(sdst)); 245482cd038dSYoshinobu Inoue sdst.sin6_family = AF_INET6; 245582cd038dSYoshinobu Inoue sdst.sin6_len = sizeof(struct sockaddr_in6); 245682cd038dSYoshinobu Inoue bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 245782cd038dSYoshinobu Inoue pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2458b2630c29SGeorge V. Neville-Neil #ifdef IPSEC 245982cd038dSYoshinobu Inoue key_sa_routechange((struct sockaddr *)&sdst); 2460b2630c29SGeorge V. Neville-Neil #endif /* IPSEC */ 246182cd038dSYoshinobu Inoue } 2462686cdd19SJun-ichiro itojun Hagino 2463686cdd19SJun-ichiro itojun Hagino freeit: 2464686cdd19SJun-ichiro itojun Hagino m_freem(m); 246533841545SHajimu UMEMOTO return; 246633841545SHajimu UMEMOTO 246733841545SHajimu UMEMOTO bad: 2468e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_badredirect); 246933841545SHajimu UMEMOTO m_freem(m); 247082cd038dSYoshinobu Inoue } 247182cd038dSYoshinobu Inoue 247282cd038dSYoshinobu Inoue void 24731272577eSXin LI icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 247482cd038dSYoshinobu Inoue { 24758b615593SMarko Zec INIT_VNET_INET6(curvnet); 247682cd038dSYoshinobu Inoue struct ifnet *ifp; /* my outgoing interface */ 247782cd038dSYoshinobu Inoue struct in6_addr *ifp_ll6; 247882cd038dSYoshinobu Inoue struct in6_addr *router_ll6; 247982cd038dSYoshinobu Inoue struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 248082cd038dSYoshinobu Inoue struct mbuf *m = NULL; /* newly allocated one */ 248182cd038dSYoshinobu Inoue struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 248282cd038dSYoshinobu Inoue struct nd_redirect *nd_rd; 248356c423b0SKip Macy struct llentry *ln = NULL; 248482cd038dSYoshinobu Inoue size_t maxlen; 248582cd038dSYoshinobu Inoue u_char *p; 248682cd038dSYoshinobu Inoue struct ifnet *outif = NULL; 2487686cdd19SJun-ichiro itojun Hagino struct sockaddr_in6 src_sa; 2488686cdd19SJun-ichiro itojun Hagino 2489603724d3SBjoern A. Zeeb icmp6_errcount(&V_icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 249082cd038dSYoshinobu Inoue 249182cd038dSYoshinobu Inoue /* if we are not router, we don't send icmp6 redirect */ 2492603724d3SBjoern A. Zeeb if (!V_ip6_forwarding) 249382cd038dSYoshinobu Inoue goto fail; 249482cd038dSYoshinobu Inoue 249582cd038dSYoshinobu Inoue /* sanity check */ 249682cd038dSYoshinobu Inoue if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 249782cd038dSYoshinobu Inoue goto fail; 249882cd038dSYoshinobu Inoue 249982cd038dSYoshinobu Inoue /* 250082cd038dSYoshinobu Inoue * Address check: 250182cd038dSYoshinobu Inoue * the source address must identify a neighbor, and 250282cd038dSYoshinobu Inoue * the destination address must not be a multicast address 250382cd038dSYoshinobu Inoue * [RFC 2461, sec 8.2] 250482cd038dSYoshinobu Inoue */ 250582cd038dSYoshinobu Inoue sip6 = mtod(m0, struct ip6_hdr *); 2506686cdd19SJun-ichiro itojun Hagino bzero(&src_sa, sizeof(src_sa)); 2507686cdd19SJun-ichiro itojun Hagino src_sa.sin6_family = AF_INET6; 2508686cdd19SJun-ichiro itojun Hagino src_sa.sin6_len = sizeof(src_sa); 2509686cdd19SJun-ichiro itojun Hagino src_sa.sin6_addr = sip6->ip6_src; 2510686cdd19SJun-ichiro itojun Hagino if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 251182cd038dSYoshinobu Inoue goto fail; 251282cd038dSYoshinobu Inoue if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 251382cd038dSYoshinobu Inoue goto fail; /* what should we do here? */ 251482cd038dSYoshinobu Inoue 251582cd038dSYoshinobu Inoue /* rate limit */ 251682cd038dSYoshinobu Inoue if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 251782cd038dSYoshinobu Inoue goto fail; 251882cd038dSYoshinobu Inoue 251982cd038dSYoshinobu Inoue /* 252082cd038dSYoshinobu Inoue * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 252182cd038dSYoshinobu Inoue * we almost always ask for an mbuf cluster for simplicity. 252282cd038dSYoshinobu Inoue * (MHLEN < IPV6_MMTU is almost always true) 252382cd038dSYoshinobu Inoue */ 2524686cdd19SJun-ichiro itojun Hagino #if IPV6_MMTU >= MCLBYTES 2525686cdd19SJun-ichiro itojun Hagino # error assumption failed about IPV6_MMTU and MCLBYTES 2526686cdd19SJun-ichiro itojun Hagino #endif 2527a163d034SWarner Losh MGETHDR(m, M_DONTWAIT, MT_HEADER); 2528686cdd19SJun-ichiro itojun Hagino if (m && IPV6_MMTU >= MHLEN) 2529a163d034SWarner Losh MCLGET(m, M_DONTWAIT); 253082cd038dSYoshinobu Inoue if (!m) 253182cd038dSYoshinobu Inoue goto fail; 253233841545SHajimu UMEMOTO m->m_pkthdr.rcvif = NULL; 253333841545SHajimu UMEMOTO m->m_len = 0; 253433841545SHajimu UMEMOTO maxlen = M_TRAILINGSPACE(m); 253582cd038dSYoshinobu Inoue maxlen = min(IPV6_MMTU, maxlen); 253682cd038dSYoshinobu Inoue /* just for safety */ 2537686cdd19SJun-ichiro itojun Hagino if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2538686cdd19SJun-ichiro itojun Hagino ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 253982cd038dSYoshinobu Inoue goto fail; 2540686cdd19SJun-ichiro itojun Hagino } 254182cd038dSYoshinobu Inoue 254282cd038dSYoshinobu Inoue { 254382cd038dSYoshinobu Inoue /* get ip6 linklocal address for ifp(my outgoing interface). */ 2544686cdd19SJun-ichiro itojun Hagino struct in6_ifaddr *ia; 2545686cdd19SJun-ichiro itojun Hagino if ((ia = in6ifa_ifpforlinklocal(ifp, 2546686cdd19SJun-ichiro itojun Hagino IN6_IFF_NOTREADY| 2547686cdd19SJun-ichiro itojun Hagino IN6_IFF_ANYCAST)) == NULL) 254882cd038dSYoshinobu Inoue goto fail; 254982cd038dSYoshinobu Inoue ifp_ll6 = &ia->ia_addr.sin6_addr; 25508c0fec80SRobert Watson /* XXXRW: reference released prematurely. */ 25518c0fec80SRobert Watson ifa_free(&ia->ia_ifa); 255282cd038dSYoshinobu Inoue } 255382cd038dSYoshinobu Inoue 255482cd038dSYoshinobu Inoue /* get ip6 linklocal address for the router. */ 255582cd038dSYoshinobu Inoue if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 255682cd038dSYoshinobu Inoue struct sockaddr_in6 *sin6; 255782cd038dSYoshinobu Inoue sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 255882cd038dSYoshinobu Inoue router_ll6 = &sin6->sin6_addr; 255982cd038dSYoshinobu Inoue if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 256082cd038dSYoshinobu Inoue router_ll6 = (struct in6_addr *)NULL; 256182cd038dSYoshinobu Inoue } else 256282cd038dSYoshinobu Inoue router_ll6 = (struct in6_addr *)NULL; 256382cd038dSYoshinobu Inoue 256482cd038dSYoshinobu Inoue /* ip6 */ 256582cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 256682cd038dSYoshinobu Inoue ip6->ip6_flow = 0; 2567686cdd19SJun-ichiro itojun Hagino ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2568686cdd19SJun-ichiro itojun Hagino ip6->ip6_vfc |= IPV6_VERSION; 256982cd038dSYoshinobu Inoue /* ip6->ip6_plen will be set later */ 257082cd038dSYoshinobu Inoue ip6->ip6_nxt = IPPROTO_ICMPV6; 257182cd038dSYoshinobu Inoue ip6->ip6_hlim = 255; 257282cd038dSYoshinobu Inoue /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 257382cd038dSYoshinobu Inoue bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 257482cd038dSYoshinobu Inoue bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 257582cd038dSYoshinobu Inoue 257682cd038dSYoshinobu Inoue /* ND Redirect */ 257782cd038dSYoshinobu Inoue nd_rd = (struct nd_redirect *)(ip6 + 1); 257882cd038dSYoshinobu Inoue nd_rd->nd_rd_type = ND_REDIRECT; 257982cd038dSYoshinobu Inoue nd_rd->nd_rd_code = 0; 258082cd038dSYoshinobu Inoue nd_rd->nd_rd_reserved = 0; 258182cd038dSYoshinobu Inoue if (rt->rt_flags & RTF_GATEWAY) { 258282cd038dSYoshinobu Inoue /* 258382cd038dSYoshinobu Inoue * nd_rd->nd_rd_target must be a link-local address in 258482cd038dSYoshinobu Inoue * better router cases. 258582cd038dSYoshinobu Inoue */ 258682cd038dSYoshinobu Inoue if (!router_ll6) 258782cd038dSYoshinobu Inoue goto fail; 258882cd038dSYoshinobu Inoue bcopy(router_ll6, &nd_rd->nd_rd_target, 258982cd038dSYoshinobu Inoue sizeof(nd_rd->nd_rd_target)); 259082cd038dSYoshinobu Inoue bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 259182cd038dSYoshinobu Inoue sizeof(nd_rd->nd_rd_dst)); 259282cd038dSYoshinobu Inoue } else { 259382cd038dSYoshinobu Inoue /* make sure redtgt == reddst */ 259482cd038dSYoshinobu Inoue bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 259582cd038dSYoshinobu Inoue sizeof(nd_rd->nd_rd_target)); 259682cd038dSYoshinobu Inoue bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 259782cd038dSYoshinobu Inoue sizeof(nd_rd->nd_rd_dst)); 259882cd038dSYoshinobu Inoue } 259982cd038dSYoshinobu Inoue 260082cd038dSYoshinobu Inoue p = (u_char *)(nd_rd + 1); 260182cd038dSYoshinobu Inoue 260282cd038dSYoshinobu Inoue if (!router_ll6) 260382cd038dSYoshinobu Inoue goto nolladdropt; 260482cd038dSYoshinobu Inoue 260582cd038dSYoshinobu Inoue { 260682cd038dSYoshinobu Inoue /* target lladdr option */ 260782cd038dSYoshinobu Inoue int len; 260882cd038dSYoshinobu Inoue struct nd_opt_hdr *nd_opt; 260982cd038dSYoshinobu Inoue char *lladdr; 261082cd038dSYoshinobu Inoue 26116e6b3f7cSQing Li IF_AFDATA_LOCK(ifp); 26126e6b3f7cSQing Li ln = nd6_lookup(router_ll6, 0, ifp); 26136e6b3f7cSQing Li IF_AFDATA_UNLOCK(ifp); 261456c423b0SKip Macy if (ln == NULL) 261582cd038dSYoshinobu Inoue goto nolladdropt; 26166e6b3f7cSQing Li 2617686cdd19SJun-ichiro itojun Hagino len = sizeof(*nd_opt) + ifp->if_addrlen; 2618686cdd19SJun-ichiro itojun Hagino len = (len + 7) & ~7; /* round by 8 */ 2619686cdd19SJun-ichiro itojun Hagino /* safety check */ 2620686cdd19SJun-ichiro itojun Hagino if (len + (p - (u_char *)ip6) > maxlen) 2621686cdd19SJun-ichiro itojun Hagino goto nolladdropt; 26226e6b3f7cSQing Li 26236e6b3f7cSQing Li if (ln->la_flags & LLE_VALID) { 262482cd038dSYoshinobu Inoue nd_opt = (struct nd_opt_hdr *)p; 262582cd038dSYoshinobu Inoue nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 262682cd038dSYoshinobu Inoue nd_opt->nd_opt_len = len >> 3; 262782cd038dSYoshinobu Inoue lladdr = (char *)(nd_opt + 1); 26286e6b3f7cSQing Li bcopy(&ln->ll_addr, lladdr, ifp->if_addrlen); 2629686cdd19SJun-ichiro itojun Hagino p += len; 263082cd038dSYoshinobu Inoue } 263182cd038dSYoshinobu Inoue } 263256c423b0SKip Macy nolladdropt: 263356c423b0SKip Macy if (ln != NULL) 263456c423b0SKip Macy LLE_RUNLOCK(ln); 263582cd038dSYoshinobu Inoue 263682cd038dSYoshinobu Inoue m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 263782cd038dSYoshinobu Inoue 263882cd038dSYoshinobu Inoue /* just to be safe */ 2639686cdd19SJun-ichiro itojun Hagino #ifdef M_DECRYPTED /*not openbsd*/ 264082cd038dSYoshinobu Inoue if (m0->m_flags & M_DECRYPTED) 264182cd038dSYoshinobu Inoue goto noredhdropt; 2642686cdd19SJun-ichiro itojun Hagino #endif 2643686cdd19SJun-ichiro itojun Hagino if (p - (u_char *)ip6 > maxlen) 2644686cdd19SJun-ichiro itojun Hagino goto noredhdropt; 264582cd038dSYoshinobu Inoue 264682cd038dSYoshinobu Inoue { 264782cd038dSYoshinobu Inoue /* redirected header option */ 264882cd038dSYoshinobu Inoue int len; 264982cd038dSYoshinobu Inoue struct nd_opt_rd_hdr *nd_opt_rh; 265082cd038dSYoshinobu Inoue 265182cd038dSYoshinobu Inoue /* 265282cd038dSYoshinobu Inoue * compute the maximum size for icmp6 redirect header option. 265382cd038dSYoshinobu Inoue * XXX room for auth header? 265482cd038dSYoshinobu Inoue */ 265582cd038dSYoshinobu Inoue len = maxlen - (p - (u_char *)ip6); 265682cd038dSYoshinobu Inoue len &= ~7; 265782cd038dSYoshinobu Inoue 265882cd038dSYoshinobu Inoue /* This is just for simplicity. */ 265982cd038dSYoshinobu Inoue if (m0->m_pkthdr.len != m0->m_len) { 266082cd038dSYoshinobu Inoue if (m0->m_next) { 266182cd038dSYoshinobu Inoue m_freem(m0->m_next); 266282cd038dSYoshinobu Inoue m0->m_next = NULL; 266382cd038dSYoshinobu Inoue } 266482cd038dSYoshinobu Inoue m0->m_pkthdr.len = m0->m_len; 266582cd038dSYoshinobu Inoue } 266682cd038dSYoshinobu Inoue 266782cd038dSYoshinobu Inoue /* 266882cd038dSYoshinobu Inoue * Redirected header option spec (RFC2461 4.6.3) talks nothing 266982cd038dSYoshinobu Inoue * about padding/truncate rule for the original IP packet. 267006cd0a3fSHajimu UMEMOTO * From the discussion on IPv6imp in Feb 1999, 267106cd0a3fSHajimu UMEMOTO * the consensus was: 267282cd038dSYoshinobu Inoue * - "attach as much as possible" is the goal 267306cd0a3fSHajimu UMEMOTO * - pad if not aligned (original size can be guessed by 267406cd0a3fSHajimu UMEMOTO * original ip6 header) 267582cd038dSYoshinobu Inoue * Following code adds the padding if it is simple enough, 267682cd038dSYoshinobu Inoue * and truncates if not. 267782cd038dSYoshinobu Inoue */ 267882cd038dSYoshinobu Inoue if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 267906cd0a3fSHajimu UMEMOTO panic("assumption failed in %s:%d", __FILE__, 268006cd0a3fSHajimu UMEMOTO __LINE__); 268182cd038dSYoshinobu Inoue 268282cd038dSYoshinobu Inoue if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 268382cd038dSYoshinobu Inoue /* not enough room, truncate */ 268406cd0a3fSHajimu UMEMOTO m0->m_pkthdr.len = m0->m_len = len - 268506cd0a3fSHajimu UMEMOTO sizeof(*nd_opt_rh); 268682cd038dSYoshinobu Inoue } else { 268782cd038dSYoshinobu Inoue /* enough room, pad or truncate */ 268882cd038dSYoshinobu Inoue size_t extra; 268982cd038dSYoshinobu Inoue 269082cd038dSYoshinobu Inoue extra = m0->m_pkthdr.len % 8; 269182cd038dSYoshinobu Inoue if (extra) { 269282cd038dSYoshinobu Inoue /* pad if easy enough, truncate if not */ 269382cd038dSYoshinobu Inoue if (8 - extra <= M_TRAILINGSPACE(m0)) { 269482cd038dSYoshinobu Inoue /* pad */ 269582cd038dSYoshinobu Inoue m0->m_len += (8 - extra); 269682cd038dSYoshinobu Inoue m0->m_pkthdr.len += (8 - extra); 269782cd038dSYoshinobu Inoue } else { 269882cd038dSYoshinobu Inoue /* truncate */ 269982cd038dSYoshinobu Inoue m0->m_pkthdr.len -= extra; 270082cd038dSYoshinobu Inoue m0->m_len -= extra; 270182cd038dSYoshinobu Inoue } 270282cd038dSYoshinobu Inoue } 270382cd038dSYoshinobu Inoue len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 270406cd0a3fSHajimu UMEMOTO m0->m_pkthdr.len = m0->m_len = len - 270506cd0a3fSHajimu UMEMOTO sizeof(*nd_opt_rh); 270682cd038dSYoshinobu Inoue } 270782cd038dSYoshinobu Inoue 270882cd038dSYoshinobu Inoue nd_opt_rh = (struct nd_opt_rd_hdr *)p; 270982cd038dSYoshinobu Inoue bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 271082cd038dSYoshinobu Inoue nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 271182cd038dSYoshinobu Inoue nd_opt_rh->nd_opt_rh_len = len >> 3; 271282cd038dSYoshinobu Inoue p += sizeof(*nd_opt_rh); 271382cd038dSYoshinobu Inoue m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 271482cd038dSYoshinobu Inoue 271582cd038dSYoshinobu Inoue /* connect m0 to m */ 2716db06e8a0SSUZUKI Shinsuke m_tag_delete_chain(m0, NULL); 2717db06e8a0SSUZUKI Shinsuke m0->m_flags &= ~M_PKTHDR; 271882cd038dSYoshinobu Inoue m->m_next = m0; 271982cd038dSYoshinobu Inoue m->m_pkthdr.len = m->m_len + m0->m_len; 2720db06e8a0SSUZUKI Shinsuke m0 = NULL; 272182cd038dSYoshinobu Inoue } 272282cd038dSYoshinobu Inoue noredhdropt:; 2723db06e8a0SSUZUKI Shinsuke if (m0) { 2724db06e8a0SSUZUKI Shinsuke m_freem(m0); 2725db06e8a0SSUZUKI Shinsuke m0 = NULL; 2726db06e8a0SSUZUKI Shinsuke } 272782cd038dSYoshinobu Inoue 27289a4f9608SHajimu UMEMOTO /* XXX: clear embedded link IDs in the inner header */ 27299a4f9608SHajimu UMEMOTO in6_clearscope(&sip6->ip6_src); 27309a4f9608SHajimu UMEMOTO in6_clearscope(&sip6->ip6_dst); 27319a4f9608SHajimu UMEMOTO in6_clearscope(&nd_rd->nd_rd_target); 27329a4f9608SHajimu UMEMOTO in6_clearscope(&nd_rd->nd_rd_dst); 273382cd038dSYoshinobu Inoue 273482cd038dSYoshinobu Inoue ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 273582cd038dSYoshinobu Inoue 273682cd038dSYoshinobu Inoue nd_rd->nd_rd_cksum = 0; 273706cd0a3fSHajimu UMEMOTO nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6, 273806cd0a3fSHajimu UMEMOTO sizeof(*ip6), ntohs(ip6->ip6_plen)); 273982cd038dSYoshinobu Inoue 274082cd038dSYoshinobu Inoue /* send the packet to outside... */ 27415d846453SSam Leffler ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 274282cd038dSYoshinobu Inoue if (outif) { 274382cd038dSYoshinobu Inoue icmp6_ifstat_inc(outif, ifs6_out_msg); 274482cd038dSYoshinobu Inoue icmp6_ifstat_inc(outif, ifs6_out_redirect); 274582cd038dSYoshinobu Inoue } 2746e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_outhist[ND_REDIRECT]); 274782cd038dSYoshinobu Inoue 274882cd038dSYoshinobu Inoue return; 274982cd038dSYoshinobu Inoue 275082cd038dSYoshinobu Inoue fail: 275182cd038dSYoshinobu Inoue if (m) 275282cd038dSYoshinobu Inoue m_freem(m); 275382cd038dSYoshinobu Inoue if (m0) 275482cd038dSYoshinobu Inoue m_freem(m0); 275582cd038dSYoshinobu Inoue } 275682cd038dSYoshinobu Inoue 275782cd038dSYoshinobu Inoue /* 275882cd038dSYoshinobu Inoue * ICMPv6 socket option processing. 275982cd038dSYoshinobu Inoue */ 276082cd038dSYoshinobu Inoue int 27611272577eSXin LI icmp6_ctloutput(struct socket *so, struct sockopt *sopt) 276282cd038dSYoshinobu Inoue { 276382cd038dSYoshinobu Inoue int error = 0; 276482cd038dSYoshinobu Inoue int optlen; 276533841545SHajimu UMEMOTO struct inpcb *inp = sotoinpcb(so); 276682cd038dSYoshinobu Inoue int level, op, optname; 276782cd038dSYoshinobu Inoue 276882cd038dSYoshinobu Inoue if (sopt) { 276982cd038dSYoshinobu Inoue level = sopt->sopt_level; 277082cd038dSYoshinobu Inoue op = sopt->sopt_dir; 277182cd038dSYoshinobu Inoue optname = sopt->sopt_name; 277282cd038dSYoshinobu Inoue optlen = sopt->sopt_valsize; 277382cd038dSYoshinobu Inoue } else 277482cd038dSYoshinobu Inoue level = op = optname = optlen = 0; 277533841545SHajimu UMEMOTO 277682cd038dSYoshinobu Inoue if (level != IPPROTO_ICMPV6) { 277782cd038dSYoshinobu Inoue return EINVAL; 277882cd038dSYoshinobu Inoue } 277982cd038dSYoshinobu Inoue 278082cd038dSYoshinobu Inoue switch (op) { 278182cd038dSYoshinobu Inoue case PRCO_SETOPT: 278282cd038dSYoshinobu Inoue switch (optname) { 278382cd038dSYoshinobu Inoue case ICMP6_FILTER: 278482cd038dSYoshinobu Inoue { 2785ae89d5a3SRobert Watson struct icmp6_filter ic6f; 278682cd038dSYoshinobu Inoue 2787ae89d5a3SRobert Watson if (optlen != sizeof(ic6f)) { 278882cd038dSYoshinobu Inoue error = EMSGSIZE; 278982cd038dSYoshinobu Inoue break; 279082cd038dSYoshinobu Inoue } 2791ae89d5a3SRobert Watson error = sooptcopyin(sopt, &ic6f, optlen, optlen); 2792ae89d5a3SRobert Watson if (error == 0) { 2793ae89d5a3SRobert Watson INP_WLOCK(inp); 2794ae89d5a3SRobert Watson *inp->in6p_icmp6filt = ic6f; 2795ae89d5a3SRobert Watson INP_WUNLOCK(inp); 2796ae89d5a3SRobert Watson } 279782cd038dSYoshinobu Inoue break; 279882cd038dSYoshinobu Inoue } 279982cd038dSYoshinobu Inoue 280082cd038dSYoshinobu Inoue default: 280182cd038dSYoshinobu Inoue error = ENOPROTOOPT; 280282cd038dSYoshinobu Inoue break; 280382cd038dSYoshinobu Inoue } 280482cd038dSYoshinobu Inoue break; 280582cd038dSYoshinobu Inoue 280682cd038dSYoshinobu Inoue case PRCO_GETOPT: 280782cd038dSYoshinobu Inoue switch (optname) { 280882cd038dSYoshinobu Inoue case ICMP6_FILTER: 280982cd038dSYoshinobu Inoue { 2810ae89d5a3SRobert Watson struct icmp6_filter ic6f; 2811ae89d5a3SRobert Watson 2812ae89d5a3SRobert Watson INP_RLOCK(inp); 2813ae89d5a3SRobert Watson ic6f = *inp->in6p_icmp6filt; 2814ae89d5a3SRobert Watson INP_RUNLOCK(inp); 2815ae89d5a3SRobert Watson error = sooptcopyout(sopt, &ic6f, sizeof(ic6f)); 281682cd038dSYoshinobu Inoue break; 281782cd038dSYoshinobu Inoue } 281882cd038dSYoshinobu Inoue 281982cd038dSYoshinobu Inoue default: 282082cd038dSYoshinobu Inoue error = ENOPROTOOPT; 282182cd038dSYoshinobu Inoue break; 282282cd038dSYoshinobu Inoue } 282382cd038dSYoshinobu Inoue break; 282482cd038dSYoshinobu Inoue } 282582cd038dSYoshinobu Inoue 282682cd038dSYoshinobu Inoue return (error); 282782cd038dSYoshinobu Inoue } 282882cd038dSYoshinobu Inoue 282982cd038dSYoshinobu Inoue /* 283082cd038dSYoshinobu Inoue * Perform rate limit check. 283182cd038dSYoshinobu Inoue * Returns 0 if it is okay to send the icmp6 packet. 283282cd038dSYoshinobu Inoue * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 283382cd038dSYoshinobu Inoue * limitation. 283482cd038dSYoshinobu Inoue * 283582cd038dSYoshinobu Inoue * XXX per-destination/type check necessary? 28361272577eSXin LI * 28371272577eSXin LI * dst - not used at this moment 28381272577eSXin LI * type - not used at this moment 28391272577eSXin LI * code - not used at this moment 284082cd038dSYoshinobu Inoue */ 284182cd038dSYoshinobu Inoue static int 28421272577eSXin LI icmp6_ratelimit(const struct in6_addr *dst, const int type, 28431272577eSXin LI const int code) 284482cd038dSYoshinobu Inoue { 28458b615593SMarko Zec INIT_VNET_INET6(curvnet); 2846686cdd19SJun-ichiro itojun Hagino int ret; 284782cd038dSYoshinobu Inoue 2848686cdd19SJun-ichiro itojun Hagino ret = 0; /* okay to send */ 284982cd038dSYoshinobu Inoue 2850686cdd19SJun-ichiro itojun Hagino /* PPS limit */ 2851603724d3SBjoern A. Zeeb if (!ppsratecheck(&V_icmp6errppslim_last, &V_icmp6errpps_count, 2852603724d3SBjoern A. Zeeb V_icmp6errppslim)) { 285382cd038dSYoshinobu Inoue /* The packet is subject to rate limit */ 2854686cdd19SJun-ichiro itojun Hagino ret++; 285582cd038dSYoshinobu Inoue } 285682cd038dSYoshinobu Inoue 2857686cdd19SJun-ichiro itojun Hagino return ret; 285882cd038dSYoshinobu Inoue } 2859