icmp6.c revision 196019
1139826Simp/*- 253541Sshin * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 353541Sshin * All rights reserved. 453541Sshin * 553541Sshin * Redistribution and use in source and binary forms, with or without 653541Sshin * modification, are permitted provided that the following conditions 753541Sshin * are met: 853541Sshin * 1. Redistributions of source code must retain the above copyright 953541Sshin * notice, this list of conditions and the following disclaimer. 1053541Sshin * 2. Redistributions in binary form must reproduce the above copyright 1153541Sshin * notice, this list of conditions and the following disclaimer in the 1253541Sshin * documentation and/or other materials provided with the distribution. 1353541Sshin * 3. Neither the name of the project nor the names of its contributors 1453541Sshin * may be used to endorse or promote products derived from this software 1553541Sshin * without specific prior written permission. 1653541Sshin * 1753541Sshin * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 1853541Sshin * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1953541Sshin * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2053541Sshin * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2153541Sshin * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2253541Sshin * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2353541Sshin * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2453541Sshin * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2553541Sshin * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2653541Sshin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2753541Sshin * SUCH DAMAGE. 28174510Sobrien * 29174510Sobrien * $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $ 3053541Sshin */ 3153541Sshin 32139826Simp/*- 3353541Sshin * Copyright (c) 1982, 1986, 1988, 1993 3453541Sshin * The Regents of the University of California. All rights reserved. 3553541Sshin * 3653541Sshin * Redistribution and use in source and binary forms, with or without 3753541Sshin * modification, are permitted provided that the following conditions 3853541Sshin * are met: 3953541Sshin * 1. Redistributions of source code must retain the above copyright 4053541Sshin * notice, this list of conditions and the following disclaimer. 4153541Sshin * 2. Redistributions in binary form must reproduce the above copyright 4253541Sshin * notice, this list of conditions and the following disclaimer in the 4353541Sshin * documentation and/or other materials provided with the distribution. 4453541Sshin * 4. Neither the name of the University nor the names of its contributors 4553541Sshin * may be used to endorse or promote products derived from this software 4653541Sshin * without specific prior written permission. 4753541Sshin * 4853541Sshin * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 4953541Sshin * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 5053541Sshin * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 5153541Sshin * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 5253541Sshin * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 5353541Sshin * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 5453541Sshin * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 5553541Sshin * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 5653541Sshin * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5753541Sshin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5853541Sshin * SUCH DAMAGE. 5953541Sshin * 6053541Sshin * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 6153541Sshin */ 6253541Sshin 63174510Sobrien#include <sys/cdefs.h> 64174510Sobrien__FBSDID("$FreeBSD: head/sys/netinet6/icmp6.c 196019 2009-08-01 19:26:27Z rwatson $"); 65174510Sobrien 6662587Sitojun#include "opt_inet.h" 6762587Sitojun#include "opt_inet6.h" 6855009Sshin#include "opt_ipsec.h" 6953541Sshin 7053541Sshin#include <sys/param.h> 7195759Stanimura#include <sys/domain.h> 72193066Sjamie#include <sys/jail.h> 7395759Stanimura#include <sys/kernel.h> 7495759Stanimura#include <sys/lock.h> 7578064Sume#include <sys/malloc.h> 7653541Sshin#include <sys/mbuf.h> 77196019Srwatson#include <sys/proc.h> 7853541Sshin#include <sys/protosw.h> 7995759Stanimura#include <sys/signalvar.h> 8053541Sshin#include <sys/socket.h> 8153541Sshin#include <sys/socketvar.h> 8295759Stanimura#include <sys/sx.h> 8395759Stanimura#include <sys/syslog.h> 8495759Stanimura#include <sys/systm.h> 8553541Sshin#include <sys/time.h> 8653541Sshin 8753541Sshin#include <net/if.h> 8853541Sshin#include <net/if_dl.h> 89186119Sqingli#include <net/if_llatbl.h> 9053541Sshin#include <net/if_types.h> 9195759Stanimura#include <net/route.h> 92185571Sbz#include <net/vnet.h> 9353541Sshin 9453541Sshin#include <netinet/in.h> 9595759Stanimura#include <netinet/in_pcb.h> 9653541Sshin#include <netinet/in_var.h> 9762587Sitojun#include <netinet/ip6.h> 9895759Stanimura#include <netinet/icmp6.h> 99122922Sandre#include <netinet/tcp_var.h> 100185571Sbz 10195759Stanimura#include <netinet6/in6_ifattach.h> 10295759Stanimura#include <netinet6/in6_pcb.h> 10395759Stanimura#include <netinet6/ip6protosw.h> 10453541Sshin#include <netinet6/ip6_var.h> 105148385Sume#include <netinet6/scope6_var.h> 10653541Sshin#include <netinet6/mld6_var.h> 10753541Sshin#include <netinet6/nd6.h> 10853541Sshin 109171167Sgnn#ifdef IPSEC 110105199Ssam#include <netipsec/ipsec.h> 111105199Ssam#include <netipsec/key.h> 112105199Ssam#endif 113105199Ssam 11462587Sitojunextern struct domain inet6domain; 115185348Szec 116195699SrwatsonVNET_DECLARE(struct inpcbinfo, ripcbinfo); 117195699SrwatsonVNET_DECLARE(struct inpcbhead, ripcb); 118195699SrwatsonVNET_DECLARE(int, icmp6errppslim); 119195699SrwatsonVNET_DECLARE(int, icmp6_nodeinfo); 12053541Sshin 121195727Srwatson#define V_ripcbinfo VNET(ripcbinfo) 122195727Srwatson#define V_ripcb VNET(ripcb) 123195727Srwatson#define V_icmp6errppslim VNET(icmp6errppslim) 124195727Srwatson#define V_icmp6_nodeinfo VNET(icmp6_nodeinfo) 125185088Szec 126195699SrwatsonVNET_DEFINE(struct icmp6stat, icmp6stat); 127195699Srwatsonstatic VNET_DEFINE(int, icmp6errpps_count); 128195699Srwatsonstatic VNET_DEFINE(struct timeval, icmp6errppslim_last); 129195699Srwatson 130195727Srwatson#define V_icmp6errpps_count VNET(icmp6errpps_count) 131195727Srwatson#define V_icmp6errppslim_last VNET(icmp6errppslim_last) 132195699Srwatson 133175162Sobrienstatic void icmp6_errcount(struct icmp6errstat *, int, int); 134175162Sobrienstatic int icmp6_rip6_input(struct mbuf **, int); 135175162Sobrienstatic int icmp6_ratelimit(const struct in6_addr *, const int, const int); 13662587Sitojunstatic const char *icmp6_redirect_diag __P((struct in6_addr *, 13762587Sitojun struct in6_addr *, struct in6_addr *)); 138175162Sobrienstatic struct mbuf *ni6_input(struct mbuf *, int); 139175162Sobrienstatic struct mbuf *ni6_nametodns(const char *, int, int); 140175162Sobrienstatic int ni6_dnsmatch(const char *, int, const char *, int); 14162587Sitojunstatic int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *, 142148892Sume struct ifnet **, struct in6_addr *)); 14362587Sitojunstatic int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 14462587Sitojun struct ifnet *, int)); 145175162Sobrienstatic int icmp6_notify_error(struct mbuf **, int, int, int); 14653541Sshin 14753541Sshin 14853541Sshinvoid 149171259Sdelphijicmp6_init(void) 15053541Sshin{ 151171259Sdelphij 152185088Szec V_icmp6errpps_count = 0; 15353541Sshin} 15453541Sshin 15562587Sitojunstatic void 156171259Sdelphijicmp6_errcount(struct icmp6errstat *stat, int type, int code) 15762587Sitojun{ 15878064Sume switch (type) { 15962587Sitojun case ICMP6_DST_UNREACH: 16062587Sitojun switch (code) { 16162587Sitojun case ICMP6_DST_UNREACH_NOROUTE: 16262587Sitojun stat->icp6errs_dst_unreach_noroute++; 16362587Sitojun return; 16462587Sitojun case ICMP6_DST_UNREACH_ADMIN: 16562587Sitojun stat->icp6errs_dst_unreach_admin++; 16662587Sitojun return; 16762587Sitojun case ICMP6_DST_UNREACH_BEYONDSCOPE: 16862587Sitojun stat->icp6errs_dst_unreach_beyondscope++; 16962587Sitojun return; 17062587Sitojun case ICMP6_DST_UNREACH_ADDR: 17162587Sitojun stat->icp6errs_dst_unreach_addr++; 17262587Sitojun return; 17362587Sitojun case ICMP6_DST_UNREACH_NOPORT: 17462587Sitojun stat->icp6errs_dst_unreach_noport++; 17562587Sitojun return; 17662587Sitojun } 17762587Sitojun break; 17862587Sitojun case ICMP6_PACKET_TOO_BIG: 17962587Sitojun stat->icp6errs_packet_too_big++; 18062587Sitojun return; 18162587Sitojun case ICMP6_TIME_EXCEEDED: 18278064Sume switch (code) { 18362587Sitojun case ICMP6_TIME_EXCEED_TRANSIT: 18462587Sitojun stat->icp6errs_time_exceed_transit++; 18562587Sitojun return; 18662587Sitojun case ICMP6_TIME_EXCEED_REASSEMBLY: 18762587Sitojun stat->icp6errs_time_exceed_reassembly++; 18862587Sitojun return; 18962587Sitojun } 19062587Sitojun break; 19162587Sitojun case ICMP6_PARAM_PROB: 19278064Sume switch (code) { 19362587Sitojun case ICMP6_PARAMPROB_HEADER: 19462587Sitojun stat->icp6errs_paramprob_header++; 19562587Sitojun return; 19662587Sitojun case ICMP6_PARAMPROB_NEXTHEADER: 19762587Sitojun stat->icp6errs_paramprob_nextheader++; 19862587Sitojun return; 19962587Sitojun case ICMP6_PARAMPROB_OPTION: 20062587Sitojun stat->icp6errs_paramprob_option++; 20162587Sitojun return; 20262587Sitojun } 20362587Sitojun break; 20462587Sitojun case ND_REDIRECT: 20562587Sitojun stat->icp6errs_redirect++; 20662587Sitojun return; 20762587Sitojun } 20862587Sitojun stat->icp6errs_unknown++; 20962587Sitojun} 21062587Sitojun 21153541Sshin/* 212148385Sume * A wrapper function for icmp6_error() necessary when the erroneous packet 213148385Sume * may not contain enough scope zone information. 214148385Sume */ 215148385Sumevoid 216171259Sdelphijicmp6_error2(struct mbuf *m, int type, int code, int param, 217171259Sdelphij struct ifnet *ifp) 218148385Sume{ 219148385Sume struct ip6_hdr *ip6; 220148385Sume 221148385Sume if (ifp == NULL) 222148385Sume return; 223148385Sume 224148385Sume#ifndef PULLDOWN_TEST 225148385Sume IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 226148385Sume#else 227148385Sume if (m->m_len < sizeof(struct ip6_hdr)) { 228148385Sume m = m_pullup(m, sizeof(struct ip6_hdr)); 229148385Sume if (m == NULL) 230148385Sume return; 231148385Sume } 232148385Sume#endif 233148385Sume 234148385Sume ip6 = mtod(m, struct ip6_hdr *); 235148385Sume 236148385Sume if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) 237148385Sume return; 238148385Sume if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 239148385Sume return; 240148385Sume 241148385Sume icmp6_error(m, type, code, param); 242148385Sume} 243148385Sume 244148385Sume/* 24553541Sshin * Generate an error packet of type error in response to bad IP6 packet. 24653541Sshin */ 24753541Sshinvoid 248171259Sdelphijicmp6_error(struct mbuf *m, int type, int code, int param) 24953541Sshin{ 25053541Sshin struct ip6_hdr *oip6, *nip6; 25153541Sshin struct icmp6_hdr *icmp6; 25262587Sitojun u_int preplen; 25353541Sshin int off; 25462587Sitojun int nxt; 25553541Sshin 256190964Srwatson ICMP6STAT_INC(icp6s_error); 25753541Sshin 25862587Sitojun /* count per-type-code statistics */ 259181803Sbz icmp6_errcount(&V_icmp6stat.icp6s_outerrhist, type, code); 26062587Sitojun 26162587Sitojun#ifdef M_DECRYPTED /*not openbsd*/ 26262587Sitojun if (m->m_flags & M_DECRYPTED) { 263190964Srwatson ICMP6STAT_INC(icp6s_canterror); 26453541Sshin goto freeit; 26562587Sitojun } 26662587Sitojun#endif 26753541Sshin 26862587Sitojun#ifndef PULLDOWN_TEST 26962587Sitojun IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 27062587Sitojun#else 27162587Sitojun if (m->m_len < sizeof(struct ip6_hdr)) { 27262587Sitojun m = m_pullup(m, sizeof(struct ip6_hdr)); 27362587Sitojun if (m == NULL) 27462587Sitojun return; 27562587Sitojun } 27662587Sitojun#endif 27753541Sshin oip6 = mtod(m, struct ip6_hdr *); 27853541Sshin 27953541Sshin /* 280121472Sume * If the destination address of the erroneous packet is a multicast 281121472Sume * address, or the packet was sent using link-layer multicast, 282121472Sume * we should basically suppress sending an error (RFC 2463, Section 283121472Sume * 2.4). 284121472Sume * We have two exceptions (the item e.2 in that section): 285121472Sume * - the Pakcet Too Big message can be sent for path MTU discovery. 286121472Sume * - the Parameter Problem Message that can be allowed an icmp6 error 287121472Sume * in the option type field. This check has been done in 288121472Sume * ip6_unknown_opt(), so we can just check the type and code. 28953541Sshin */ 29053541Sshin if ((m->m_flags & (M_BCAST|M_MCAST) || 29153541Sshin IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 29253541Sshin (type != ICMP6_PACKET_TOO_BIG && 29353541Sshin (type != ICMP6_PARAM_PROB || 29453541Sshin code != ICMP6_PARAMPROB_OPTION))) 29553541Sshin goto freeit; 29653541Sshin 297121472Sume /* 298121472Sume * RFC 2463, 2.4 (e.5): source address check. 299121472Sume * XXX: the case of anycast source? 300121472Sume */ 30153541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 30253541Sshin IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 30353541Sshin goto freeit; 30453541Sshin 30553541Sshin /* 30662587Sitojun * If we are about to send ICMPv6 against ICMPv6 error/redirect, 30762587Sitojun * don't do it. 30853541Sshin */ 30962587Sitojun nxt = -1; 31062587Sitojun off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 31162587Sitojun if (off >= 0 && nxt == IPPROTO_ICMPV6) { 31253541Sshin struct icmp6_hdr *icp; 31353541Sshin 31462587Sitojun#ifndef PULLDOWN_TEST 31562587Sitojun IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), ); 31662587Sitojun icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 31762587Sitojun#else 31862587Sitojun IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 31962587Sitojun sizeof(*icp)); 32062587Sitojun if (icp == NULL) { 321190964Srwatson ICMP6STAT_INC(icp6s_tooshort); 32262587Sitojun return; 32362587Sitojun } 32462587Sitojun#endif 32562587Sitojun if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 32662587Sitojun icp->icmp6_type == ND_REDIRECT) { 32753541Sshin /* 32862587Sitojun * ICMPv6 error 32962587Sitojun * Special case: for redirect (which is 33062587Sitojun * informational) we must not send icmp6 error. 33153541Sshin */ 332190964Srwatson ICMP6STAT_INC(icp6s_canterror); 33362587Sitojun goto freeit; 33462587Sitojun } else { 33562587Sitojun /* ICMPv6 informational - send the error */ 33653541Sshin } 33762587Sitojun } else { 33862587Sitojun /* non-ICMPv6 - send the error */ 33953541Sshin } 34053541Sshin 34153541Sshin oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 34253541Sshin 34353541Sshin /* Finally, do rate limitation check. */ 34453541Sshin if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 345190964Srwatson ICMP6STAT_INC(icp6s_toofreq); 34653541Sshin goto freeit; 34753541Sshin } 34853541Sshin 34953541Sshin /* 35053541Sshin * OK, ICMP6 can be generated. 35153541Sshin */ 35253541Sshin 35353541Sshin if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 35453541Sshin m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 35553541Sshin 35662587Sitojun preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 357111119Simp M_PREPEND(m, preplen, M_DONTWAIT); 35862587Sitojun if (m && m->m_len < preplen) 35962587Sitojun m = m_pullup(m, preplen); 36053541Sshin if (m == NULL) { 36178064Sume nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__)); 36253541Sshin return; 36353541Sshin } 36453541Sshin 36553541Sshin nip6 = mtod(m, struct ip6_hdr *); 36653541Sshin nip6->ip6_src = oip6->ip6_src; 36753541Sshin nip6->ip6_dst = oip6->ip6_dst; 36853541Sshin 369121315Sume in6_clearscope(&oip6->ip6_src); 370121315Sume in6_clearscope(&oip6->ip6_dst); 37153541Sshin 37253541Sshin icmp6 = (struct icmp6_hdr *)(nip6 + 1); 37353541Sshin icmp6->icmp6_type = type; 37453541Sshin icmp6->icmp6_code = code; 37553541Sshin icmp6->icmp6_pptr = htonl((u_int32_t)param); 37653541Sshin 37778064Sume /* 37878064Sume * icmp6_reflect() is designed to be in the input path. 379148987Sume * icmp6_error() can be called from both input and output path, 38078064Sume * and if we are in output path rcvif could contain bogus value. 38178064Sume * clear m->m_pkthdr.rcvif for safety, we should have enough scope 38278064Sume * information in ip header (nip6). 38378064Sume */ 38478064Sume m->m_pkthdr.rcvif = NULL; 38578064Sume 386190964Srwatson ICMP6STAT_INC(icp6s_outhist[type]); 38795023Ssuz icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 38862587Sitojun 38962587Sitojun return; 39062587Sitojun 39162587Sitojun freeit: 39262587Sitojun /* 393148987Sume * If we can't tell whether or not we can generate ICMP6, free it. 39462587Sitojun */ 39562587Sitojun m_freem(m); 39653541Sshin} 39753541Sshin 39853541Sshin/* 39953541Sshin * Process a received ICMP6 message. 40053541Sshin */ 40153541Sshinint 402171259Sdelphijicmp6_input(struct mbuf **mp, int *offp, int proto) 40353541Sshin{ 40453541Sshin struct mbuf *m = *mp, *n; 405192923Sbms struct ifnet *ifp; 40653541Sshin struct ip6_hdr *ip6, *nip6; 40753541Sshin struct icmp6_hdr *icmp6, *nicmp6; 40853541Sshin int off = *offp; 40953541Sshin int icmp6len = m->m_pkthdr.len - *offp; 41053541Sshin int code, sum, noff; 411165118Sbz char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 41253541Sshin 413192923Sbms ifp = m->m_pkthdr.rcvif; 414192923Sbms 41562587Sitojun#ifndef PULLDOWN_TEST 41653541Sshin IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE); 41795023Ssuz /* m might change if M_LOOP. So, call mtod after this */ 41862587Sitojun#endif 41953541Sshin 42053541Sshin /* 42153541Sshin * Locate icmp6 structure in mbuf, and check 42253541Sshin * that not corrupted and of at least minimum length 42353541Sshin */ 42453541Sshin 42553541Sshin ip6 = mtod(m, struct ip6_hdr *); 42653541Sshin if (icmp6len < sizeof(struct icmp6_hdr)) { 427190964Srwatson ICMP6STAT_INC(icp6s_tooshort); 42853541Sshin goto freeit; 42953541Sshin } 43053541Sshin 43153541Sshin /* 432191672Sbms * Check multicast group membership. 433191672Sbms * Note: SSM filters are not applied for ICMPv6 traffic. 434191672Sbms */ 435191672Sbms if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 436192923Sbms struct in6_multi *inm; 437191672Sbms 438191672Sbms inm = in6m_lookup(ifp, &ip6->ip6_dst); 439191672Sbms if (inm == NULL) { 440191672Sbms IP6STAT_INC(ip6s_notmember); 441191672Sbms in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 442191672Sbms goto freeit; 443191672Sbms } 444191672Sbms } 445191672Sbms 446191672Sbms /* 44753541Sshin * calculate the checksum 44853541Sshin */ 44962587Sitojun#ifndef PULLDOWN_TEST 45053541Sshin icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 45162587Sitojun#else 45262587Sitojun IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 45362587Sitojun if (icmp6 == NULL) { 454190964Srwatson ICMP6STAT_INC(icp6s_tooshort); 45562587Sitojun return IPPROTO_DONE; 45662587Sitojun } 45762587Sitojun#endif 45853541Sshin code = icmp6->icmp6_code; 45953541Sshin 46053541Sshin if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 46178064Sume nd6log((LOG_ERR, 46253541Sshin "ICMP6 checksum error(%d|%x) %s\n", 463165118Sbz icmp6->icmp6_type, sum, 464165118Sbz ip6_sprintf(ip6bufs, &ip6->ip6_src))); 465190964Srwatson ICMP6STAT_INC(icp6s_checksum); 46653541Sshin goto freeit; 46753541Sshin } 46853541Sshin 46983934Sbrooks if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 47053541Sshin /* 47153541Sshin * Deliver very specific ICMP6 type only. 472148987Sume * This is important to deliver TOOBIG. Otherwise PMTUD 47353541Sshin * will not work. 47453541Sshin */ 47553541Sshin switch (icmp6->icmp6_type) { 47653541Sshin case ICMP6_DST_UNREACH: 47753541Sshin case ICMP6_PACKET_TOO_BIG: 47853541Sshin case ICMP6_TIME_EXCEEDED: 47953541Sshin break; 48053541Sshin default: 48153541Sshin goto freeit; 48253541Sshin } 48353541Sshin } 48453541Sshin 485190964Srwatson ICMP6STAT_INC(icp6s_inhist[icmp6->icmp6_type]); 486192923Sbms icmp6_ifstat_inc(ifp, ifs6_in_msg); 48753541Sshin if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 488192923Sbms icmp6_ifstat_inc(ifp, ifs6_in_error); 48953541Sshin 49053541Sshin switch (icmp6->icmp6_type) { 49153541Sshin case ICMP6_DST_UNREACH: 492192923Sbms icmp6_ifstat_inc(ifp, ifs6_in_dstunreach); 49353541Sshin switch (code) { 49453541Sshin case ICMP6_DST_UNREACH_NOROUTE: 49553541Sshin code = PRC_UNREACH_NET; 49653541Sshin break; 49753541Sshin case ICMP6_DST_UNREACH_ADMIN: 498192923Sbms icmp6_ifstat_inc(ifp, ifs6_in_adminprohib); 49962587Sitojun code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 50062587Sitojun break; 50153541Sshin case ICMP6_DST_UNREACH_ADDR: 50262587Sitojun code = PRC_HOSTDEAD; 50353541Sshin break; 50462587Sitojun case ICMP6_DST_UNREACH_BEYONDSCOPE: 50562587Sitojun /* I mean "source address was incorrect." */ 50662587Sitojun code = PRC_PARAMPROB; 50762587Sitojun break; 50853541Sshin case ICMP6_DST_UNREACH_NOPORT: 50953541Sshin code = PRC_UNREACH_PORT; 51053541Sshin break; 51153541Sshin default: 51253541Sshin goto badcode; 51353541Sshin } 51453541Sshin goto deliver; 51553541Sshin break; 51653541Sshin 51753541Sshin case ICMP6_PACKET_TOO_BIG: 518192923Sbms icmp6_ifstat_inc(ifp, ifs6_in_pkttoobig); 51953541Sshin 520126194Sume /* validation is made in icmp6_mtudisc_update */ 521126194Sume 52253541Sshin code = PRC_MSGSIZE; 52353541Sshin 52462587Sitojun /* 52562587Sitojun * Updating the path MTU will be done after examining 52662587Sitojun * intermediate extension headers. 52762587Sitojun */ 52853541Sshin goto deliver; 52953541Sshin break; 53053541Sshin 53153541Sshin case ICMP6_TIME_EXCEEDED: 532192923Sbms icmp6_ifstat_inc(ifp, ifs6_in_timeexceed); 53353541Sshin switch (code) { 53453541Sshin case ICMP6_TIME_EXCEED_TRANSIT: 535151465Ssuz code = PRC_TIMXCEED_INTRANS; 536151465Ssuz break; 53753541Sshin case ICMP6_TIME_EXCEED_REASSEMBLY: 538151465Ssuz code = PRC_TIMXCEED_REASS; 53953541Sshin break; 54053541Sshin default: 54153541Sshin goto badcode; 54253541Sshin } 54353541Sshin goto deliver; 54453541Sshin break; 54553541Sshin 54653541Sshin case ICMP6_PARAM_PROB: 547192923Sbms icmp6_ifstat_inc(ifp, ifs6_in_paramprob); 54853541Sshin switch (code) { 54953541Sshin case ICMP6_PARAMPROB_NEXTHEADER: 55053541Sshin code = PRC_UNREACH_PROTOCOL; 55153541Sshin break; 55253541Sshin case ICMP6_PARAMPROB_HEADER: 55353541Sshin case ICMP6_PARAMPROB_OPTION: 55453541Sshin code = PRC_PARAMPROB; 55553541Sshin break; 55653541Sshin default: 55753541Sshin goto badcode; 55853541Sshin } 55953541Sshin goto deliver; 56053541Sshin break; 56153541Sshin 56253541Sshin case ICMP6_ECHO_REQUEST: 563192923Sbms icmp6_ifstat_inc(ifp, ifs6_in_echo); 56453541Sshin if (code != 0) 56553541Sshin goto badcode; 56653541Sshin if ((n = m_copy(m, 0, M_COPYALL)) == NULL) { 56753541Sshin /* Give up remote */ 56853541Sshin break; 56953541Sshin } 57062587Sitojun if ((n->m_flags & M_EXT) != 0 57162587Sitojun || n->m_len < off + sizeof(struct icmp6_hdr)) { 57253541Sshin struct mbuf *n0 = n; 57362587Sitojun const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 574108741Ssam int n0len; 57553541Sshin 576111119Simp MGETHDR(n, M_DONTWAIT, n0->m_type); 577111070Ssam n0len = n0->m_pkthdr.len; /* save for use below */ 578111070Ssam if (n) 579111070Ssam M_MOVE_PKTHDR(n, n0); 58062587Sitojun if (n && maxlen >= MHLEN) { 581111119Simp MCLGET(n, M_DONTWAIT); 58262587Sitojun if ((n->m_flags & M_EXT) == 0) { 58362587Sitojun m_free(n); 58462587Sitojun n = NULL; 58562587Sitojun } 58662587Sitojun } 58753541Sshin if (n == NULL) { 58853541Sshin /* Give up remote */ 58953541Sshin m_freem(n0); 59053541Sshin break; 59153541Sshin } 59253541Sshin /* 59353541Sshin * Copy IPv6 and ICMPv6 only. 59453541Sshin */ 59553541Sshin nip6 = mtod(n, struct ip6_hdr *); 59653541Sshin bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 59753541Sshin nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 59853541Sshin bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 59962587Sitojun noff = sizeof(struct ip6_hdr); 600108741Ssam /* new mbuf contains only ipv6+icmpv6 headers */ 601108741Ssam n->m_len = noff + sizeof(struct icmp6_hdr); 60253541Sshin /* 603120891Sume * Adjust mbuf. ip6_plen will be adjusted in 60462587Sitojun * ip6_output(). 60553541Sshin */ 60662587Sitojun m_adj(n0, off + sizeof(struct icmp6_hdr)); 607108741Ssam /* recalculate complete packet size */ 608108741Ssam n->m_pkthdr.len = n0len + (noff - off); 60962587Sitojun n->m_next = n0; 61053541Sshin } else { 61153541Sshin nip6 = mtod(n, struct ip6_hdr *); 612166046Sume IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 613166046Sume sizeof(*nicmp6)); 61453541Sshin noff = off; 61553541Sshin } 61653541Sshin nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 61753541Sshin nicmp6->icmp6_code = 0; 61853541Sshin if (n) { 619190964Srwatson ICMP6STAT_INC(icp6s_reflect); 620190964Srwatson ICMP6STAT_INC(icp6s_outhist[ICMP6_ECHO_REPLY]); 62153541Sshin icmp6_reflect(n, noff); 62253541Sshin } 62353541Sshin break; 62453541Sshin 62553541Sshin case ICMP6_ECHO_REPLY: 626192923Sbms icmp6_ifstat_inc(ifp, ifs6_in_echoreply); 62753541Sshin if (code != 0) 62853541Sshin goto badcode; 62953541Sshin break; 63053541Sshin 63196116Sume case MLD_LISTENER_QUERY: 63296116Sume case MLD_LISTENER_REPORT: 633191672Sbms case MLD_LISTENER_DONE: 634191672Sbms case MLDV2_LISTENER_REPORT: 635191672Sbms /* 636192923Sbms * Drop MLD traffic which is not link-local, has a hop limit 637192923Sbms * of greater than 1 hop, or which does not have the 638192923Sbms * IPv6 HBH Router Alert option. 639192923Sbms * As IPv6 HBH options are stripped in ip6_input() we must 640192923Sbms * check an mbuf header flag. 641191672Sbms * XXX Should we also sanity check that these messages 642191672Sbms * were directed to a link-local multicast prefix? 643191672Sbms */ 644192923Sbms if ((ip6->ip6_hlim != 1) || (m->m_flags & M_RTALERT_MLD) == 0) 64562587Sitojun goto freeit; 646191672Sbms if (mld_input(m, off, icmp6len) != 0) 647191672Sbms return (IPPROTO_DONE); 64853541Sshin /* m stays. */ 64953541Sshin break; 65053541Sshin 65153541Sshin case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 65253541Sshin { 65353541Sshin enum { WRU, FQDN } mode; 65453541Sshin 655181803Sbz if (!V_icmp6_nodeinfo) 65662587Sitojun break; 65762587Sitojun 65853541Sshin if (icmp6len == sizeof(struct icmp6_hdr) + 4) 65953541Sshin mode = WRU; 66062587Sitojun else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 66153541Sshin mode = FQDN; 66253541Sshin else 66353541Sshin goto badlen; 66453541Sshin 66553541Sshin if (mode == FQDN) { 66662587Sitojun#ifndef PULLDOWN_TEST 66753541Sshin IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), 668120891Sume IPPROTO_DONE); 66962587Sitojun#endif 67062587Sitojun n = m_copy(m, 0, M_COPYALL); 67162587Sitojun if (n) 67262587Sitojun n = ni6_input(n, off); 67362587Sitojun /* XXX meaningless if n == NULL */ 67453541Sshin noff = sizeof(struct ip6_hdr); 67553541Sshin } else { 676193066Sjamie struct prison *pr; 67753541Sshin u_char *p; 678193066Sjamie int maxlen, maxhlen, hlen; 67953541Sshin 680169664Sjinmei /* 681169664Sjinmei * XXX: this combination of flags is pointless, 682169664Sjinmei * but should we keep this for compatibility? 683169664Sjinmei */ 684181803Sbz if ((V_icmp6_nodeinfo & 5) != 5) 68578064Sume break; 68678064Sume 68762587Sitojun if (code != 0) 68862587Sitojun goto badcode; 68962587Sitojun maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 69062587Sitojun if (maxlen >= MCLBYTES) { 69162587Sitojun /* Give up remote */ 69262587Sitojun break; 69362587Sitojun } 694111119Simp MGETHDR(n, M_DONTWAIT, m->m_type); 69562587Sitojun if (n && maxlen > MHLEN) { 696111119Simp MCLGET(n, M_DONTWAIT); 69762587Sitojun if ((n->m_flags & M_EXT) == 0) { 69862587Sitojun m_free(n); 69962587Sitojun n = NULL; 70062587Sitojun } 70162587Sitojun } 702166619Sbms if (n && !m_dup_pkthdr(n, m, M_DONTWAIT)) { 703108466Ssam /* 704108466Ssam * Previous code did a blind M_COPY_PKTHDR 705108466Ssam * and said "just for rcvif". If true, then 706108466Ssam * we could tolerate the dup failing (due to 707108466Ssam * the deep copy of the tag chain). For now 708108466Ssam * be conservative and just fail. 709108466Ssam */ 710108466Ssam m_free(n); 711108466Ssam n = NULL; 712108466Ssam } 71353541Sshin if (n == NULL) { 71453541Sshin /* Give up remote */ 71553541Sshin break; 71653541Sshin } 71778064Sume n->m_pkthdr.rcvif = NULL; 71862587Sitojun n->m_len = 0; 71962587Sitojun maxhlen = M_TRAILINGSPACE(n) - maxlen; 720193066Sjamie pr = curthread->td_ucred->cr_prison; 721193066Sjamie mtx_lock(&pr->pr_mtx); 722194118Sjamie hlen = strlen(pr->pr_hostname); 723193066Sjamie if (maxhlen > hlen) 724193066Sjamie maxhlen = hlen; 72553541Sshin /* 72653541Sshin * Copy IPv6 and ICMPv6 only. 72753541Sshin */ 72853541Sshin nip6 = mtod(n, struct ip6_hdr *); 72953541Sshin bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 73053541Sshin nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 73153541Sshin bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 73253541Sshin p = (u_char *)(nicmp6 + 1); 73353541Sshin bzero(p, 4); 734194118Sjamie /* meaningless TTL */ 735194118Sjamie bcopy(pr->pr_hostname, p + 4, maxhlen); 736193066Sjamie mtx_unlock(&pr->pr_mtx); 73753541Sshin noff = sizeof(struct ip6_hdr); 73853541Sshin n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 73962587Sitojun sizeof(struct icmp6_hdr) + 4 + maxhlen; 74053541Sshin nicmp6->icmp6_type = ICMP6_WRUREPLY; 74153541Sshin nicmp6->icmp6_code = 0; 74253541Sshin } 74353541Sshin if (n) { 744190964Srwatson ICMP6STAT_INC(icp6s_reflect); 745190964Srwatson ICMP6STAT_INC(icp6s_outhist[ICMP6_WRUREPLY]); 74653541Sshin icmp6_reflect(n, noff); 74753541Sshin } 74853541Sshin break; 74953541Sshin } 75053541Sshin 75153541Sshin case ICMP6_WRUREPLY: 75253541Sshin if (code != 0) 75353541Sshin goto badcode; 75453541Sshin break; 75553541Sshin 75653541Sshin case ND_ROUTER_SOLICIT: 757192923Sbms icmp6_ifstat_inc(ifp, ifs6_in_routersolicit); 75853541Sshin if (code != 0) 75953541Sshin goto badcode; 76053541Sshin if (icmp6len < sizeof(struct nd_router_solicit)) 76153541Sshin goto badlen; 762111119Simp if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 76362587Sitojun /* give up local */ 76462587Sitojun nd6_rs_input(m, off, icmp6len); 76562587Sitojun m = NULL; 76662587Sitojun goto freeit; 76762587Sitojun } 76862587Sitojun nd6_rs_input(n, off, icmp6len); 76953541Sshin /* m stays. */ 77053541Sshin break; 77153541Sshin 77253541Sshin case ND_ROUTER_ADVERT: 773192923Sbms icmp6_ifstat_inc(ifp, ifs6_in_routeradvert); 77453541Sshin if (code != 0) 77553541Sshin goto badcode; 77653541Sshin if (icmp6len < sizeof(struct nd_router_advert)) 77753541Sshin goto badlen; 778111119Simp if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 77962587Sitojun /* give up local */ 78062587Sitojun nd6_ra_input(m, off, icmp6len); 78162587Sitojun m = NULL; 78262587Sitojun goto freeit; 78362587Sitojun } 78462587Sitojun nd6_ra_input(n, off, icmp6len); 78553541Sshin /* m stays. */ 78653541Sshin break; 78753541Sshin 78853541Sshin case ND_NEIGHBOR_SOLICIT: 789192923Sbms icmp6_ifstat_inc(ifp, ifs6_in_neighborsolicit); 79053541Sshin if (code != 0) 79153541Sshin goto badcode; 79253541Sshin if (icmp6len < sizeof(struct nd_neighbor_solicit)) 79353541Sshin goto badlen; 794111119Simp if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 79562587Sitojun /* give up local */ 79662587Sitojun nd6_ns_input(m, off, icmp6len); 79762587Sitojun m = NULL; 79862587Sitojun goto freeit; 79962587Sitojun } 80062587Sitojun nd6_ns_input(n, off, icmp6len); 80153541Sshin /* m stays. */ 80253541Sshin break; 80353541Sshin 80453541Sshin case ND_NEIGHBOR_ADVERT: 805192923Sbms icmp6_ifstat_inc(ifp, ifs6_in_neighboradvert); 80653541Sshin if (code != 0) 80753541Sshin goto badcode; 80853541Sshin if (icmp6len < sizeof(struct nd_neighbor_advert)) 80953541Sshin goto badlen; 810111119Simp if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 81162587Sitojun /* give up local */ 81262587Sitojun nd6_na_input(m, off, icmp6len); 81362587Sitojun m = NULL; 81462587Sitojun goto freeit; 81562587Sitojun } 81662587Sitojun nd6_na_input(n, off, icmp6len); 81753541Sshin /* m stays. */ 81853541Sshin break; 81953541Sshin 82053541Sshin case ND_REDIRECT: 821192923Sbms icmp6_ifstat_inc(ifp, ifs6_in_redirect); 82253541Sshin if (code != 0) 82353541Sshin goto badcode; 82453541Sshin if (icmp6len < sizeof(struct nd_redirect)) 82553541Sshin goto badlen; 826111119Simp if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 82762587Sitojun /* give up local */ 82862587Sitojun icmp6_redirect_input(m, off); 82962587Sitojun m = NULL; 83062587Sitojun goto freeit; 83162587Sitojun } 83262587Sitojun icmp6_redirect_input(n, off); 83353541Sshin /* m stays. */ 83453541Sshin break; 83553541Sshin 83653541Sshin case ICMP6_ROUTER_RENUMBERING: 83753541Sshin if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 83853541Sshin code != ICMP6_ROUTER_RENUMBERING_RESULT) 83953541Sshin goto badcode; 84053541Sshin if (icmp6len < sizeof(struct icmp6_router_renum)) 84153541Sshin goto badlen; 84253541Sshin break; 84353541Sshin 84453541Sshin default: 84578064Sume nd6log((LOG_DEBUG, 84678064Sume "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 847165118Sbz icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src), 848165118Sbz ip6_sprintf(ip6bufd, &ip6->ip6_dst), 849192923Sbms ifp ? ifp->if_index : 0)); 85053541Sshin if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 85153541Sshin /* ICMPv6 error: MUST deliver it by spec... */ 85253541Sshin code = PRC_NCMDS; 85353541Sshin /* deliver */ 85453541Sshin } else { 85553541Sshin /* ICMPv6 informational: MUST not deliver */ 85653541Sshin break; 85753541Sshin } 85853541Sshin deliver: 859142681Sume if (icmp6_notify_error(&m, off, icmp6len, code)) { 86078064Sume /* In this case, m should've been freed. */ 861120856Sume return (IPPROTO_DONE); 86253541Sshin } 86378064Sume break; 86478064Sume 86578064Sume badcode: 866190964Srwatson ICMP6STAT_INC(icp6s_badcode); 86778064Sume break; 86878064Sume 86978064Sume badlen: 870190964Srwatson ICMP6STAT_INC(icp6s_badlen); 87178064Sume break; 87278064Sume } 87378064Sume 87478064Sume /* deliver the packet to appropriate sockets */ 87578064Sume icmp6_rip6_input(&m, *offp); 87678064Sume 87778064Sume return IPPROTO_DONE; 87878064Sume 87978064Sume freeit: 88078064Sume m_freem(m); 88178064Sume return IPPROTO_DONE; 88278064Sume} 88378064Sume 88478064Sumestatic int 885171259Sdelphijicmp6_notify_error(struct mbuf **mp, int off, int icmp6len, int code) 88678064Sume{ 887142681Sume struct mbuf *m = *mp; 88878064Sume struct icmp6_hdr *icmp6; 88978064Sume struct ip6_hdr *eip6; 89078064Sume u_int32_t notifymtu; 89178064Sume struct sockaddr_in6 icmp6src, icmp6dst; 89278064Sume 89378064Sume if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 894190964Srwatson ICMP6STAT_INC(icp6s_tooshort); 89578064Sume goto freeit; 89678064Sume } 89762587Sitojun#ifndef PULLDOWN_TEST 89878064Sume IP6_EXTHDR_CHECK(m, off, 899120891Sume sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1); 90078064Sume icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 90162587Sitojun#else 90278064Sume IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 903120891Sume sizeof(*icmp6) + sizeof(struct ip6_hdr)); 90478064Sume if (icmp6 == NULL) { 905190964Srwatson ICMP6STAT_INC(icp6s_tooshort); 906120856Sume return (-1); 90778064Sume } 90862587Sitojun#endif 90978064Sume eip6 = (struct ip6_hdr *)(icmp6 + 1); 91053541Sshin 91178064Sume /* Detect the upper level protocol */ 91278064Sume { 913175162Sobrien void (*ctlfunc)(int, struct sockaddr *, void *); 91453541Sshin u_int8_t nxt = eip6->ip6_nxt; 91553541Sshin int eoff = off + sizeof(struct icmp6_hdr) + 916120891Sume sizeof(struct ip6_hdr); 91753541Sshin struct ip6ctlparam ip6cp; 91862587Sitojun struct in6_addr *finaldst = NULL; 91962587Sitojun int icmp6type = icmp6->icmp6_type; 92062587Sitojun struct ip6_frag *fh; 92162587Sitojun struct ip6_rthdr *rth; 92262587Sitojun struct ip6_rthdr0 *rth0; 92362587Sitojun int rthlen; 92453541Sshin 92595023Ssuz while (1) { /* XXX: should avoid infinite loop explicitly? */ 92653541Sshin struct ip6_ext *eh; 92753541Sshin 92878064Sume switch (nxt) { 92953541Sshin case IPPROTO_HOPOPTS: 93053541Sshin case IPPROTO_DSTOPTS: 93153541Sshin case IPPROTO_AH: 93262587Sitojun#ifndef PULLDOWN_TEST 933120891Sume IP6_EXTHDR_CHECK(m, 0, 934120891Sume eoff + sizeof(struct ip6_ext), -1); 935120892Sume eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff); 93662587Sitojun#else 93762587Sitojun IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 938120891Sume eoff, sizeof(*eh)); 93962587Sitojun if (eh == NULL) { 940190964Srwatson ICMP6STAT_INC(icp6s_tooshort); 941120856Sume return (-1); 94262587Sitojun } 94362587Sitojun#endif 944120891Sume 94553541Sshin if (nxt == IPPROTO_AH) 94653541Sshin eoff += (eh->ip6e_len + 2) << 2; 94753541Sshin else 94853541Sshin eoff += (eh->ip6e_len + 1) << 3; 94953541Sshin nxt = eh->ip6e_nxt; 95053541Sshin break; 95162587Sitojun case IPPROTO_ROUTING: 95262587Sitojun /* 95362587Sitojun * When the erroneous packet contains a 95462587Sitojun * routing header, we should examine the 95562587Sitojun * header to determine the final destination. 95662587Sitojun * Otherwise, we can't properly update 95762587Sitojun * information that depends on the final 95862587Sitojun * destination (e.g. path MTU). 95962587Sitojun */ 96062587Sitojun#ifndef PULLDOWN_TEST 961120891Sume IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1); 962120891Sume rth = (struct ip6_rthdr *) 963120891Sume (mtod(m, caddr_t) + eoff); 96462587Sitojun#else 96562587Sitojun IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 966120891Sume eoff, sizeof(*rth)); 96762587Sitojun if (rth == NULL) { 968190964Srwatson ICMP6STAT_INC(icp6s_tooshort); 969120856Sume return (-1); 97062587Sitojun } 97162587Sitojun#endif 97262587Sitojun rthlen = (rth->ip6r_len + 1) << 3; 97362587Sitojun /* 97462587Sitojun * XXX: currently there is no 97562587Sitojun * officially defined type other 97662587Sitojun * than type-0. 97762587Sitojun * Note that if the segment left field 97862587Sitojun * is 0, all intermediate hops must 97962587Sitojun * have been passed. 98062587Sitojun */ 98162587Sitojun if (rth->ip6r_segleft && 98262587Sitojun rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 98362587Sitojun int hops; 98462587Sitojun 98562587Sitojun#ifndef PULLDOWN_TEST 986120891Sume IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1); 987120891Sume rth0 = (struct ip6_rthdr0 *) 988120891Sume (mtod(m, caddr_t) + eoff); 98962587Sitojun#else 99062587Sitojun IP6_EXTHDR_GET(rth0, 991120891Sume struct ip6_rthdr0 *, m, 992120891Sume eoff, rthlen); 99362587Sitojun if (rth0 == NULL) { 994190964Srwatson ICMP6STAT_INC(icp6s_tooshort); 995120856Sume return (-1); 99662587Sitojun } 99762587Sitojun#endif 99862587Sitojun /* just ignore a bogus header */ 99962587Sitojun if ((rth0->ip6r0_len % 2) == 0 && 100062587Sitojun (hops = rth0->ip6r0_len/2)) 100162587Sitojun finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 100262587Sitojun } 100362587Sitojun eoff += rthlen; 100462587Sitojun nxt = rth->ip6r_nxt; 100562587Sitojun break; 100662587Sitojun case IPPROTO_FRAGMENT: 100762587Sitojun#ifndef PULLDOWN_TEST 100862587Sitojun IP6_EXTHDR_CHECK(m, 0, eoff + 1009120891Sume sizeof(struct ip6_frag), -1); 1010120891Sume fh = (struct ip6_frag *)(mtod(m, caddr_t) + 1011120891Sume eoff); 101262587Sitojun#else 101362587Sitojun IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1014120891Sume eoff, sizeof(*fh)); 101562587Sitojun if (fh == NULL) { 1016190964Srwatson ICMP6STAT_INC(icp6s_tooshort); 1017120856Sume return (-1); 101862587Sitojun } 101962587Sitojun#endif 102062587Sitojun /* 102162587Sitojun * Data after a fragment header is meaningless 102262587Sitojun * unless it is the first fragment, but 102362587Sitojun * we'll go to the notify label for path MTU 102462587Sitojun * discovery. 102562587Sitojun */ 102662587Sitojun if (fh->ip6f_offlg & IP6F_OFF_MASK) 102762587Sitojun goto notify; 102862587Sitojun 102962587Sitojun eoff += sizeof(struct ip6_frag); 103062587Sitojun nxt = fh->ip6f_nxt; 103162587Sitojun break; 103253541Sshin default: 103362587Sitojun /* 103462587Sitojun * This case includes ESP and the No Next 103595023Ssuz * Header. In such cases going to the notify 103662587Sitojun * label does not have any meaning 103762587Sitojun * (i.e. ctlfunc will be NULL), but we go 103862587Sitojun * anyway since we might have to update 103962587Sitojun * path MTU information. 104062587Sitojun */ 104153541Sshin goto notify; 104253541Sshin } 104353541Sshin } 104478064Sume notify: 104562587Sitojun#ifndef PULLDOWN_TEST 104653541Sshin icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 104762587Sitojun#else 104862587Sitojun IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1049120891Sume sizeof(*icmp6) + sizeof(struct ip6_hdr)); 105062587Sitojun if (icmp6 == NULL) { 1051190964Srwatson ICMP6STAT_INC(icp6s_tooshort); 1052120856Sume return (-1); 105362587Sitojun } 105462587Sitojun#endif 105578064Sume 1056120891Sume /* 1057120891Sume * retrieve parameters from the inner IPv6 header, and convert 1058120891Sume * them into sockaddr structures. 1059120891Sume * XXX: there is no guarantee that the source or destination 1060120891Sume * addresses of the inner packet are in the same scope as 1061120891Sume * the addresses of the icmp packet. But there is no other 1062120891Sume * way to determine the zone. 1063120891Sume */ 106478064Sume eip6 = (struct ip6_hdr *)(icmp6 + 1); 1065120891Sume 106678064Sume bzero(&icmp6dst, sizeof(icmp6dst)); 106778064Sume icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 106878064Sume icmp6dst.sin6_family = AF_INET6; 106978064Sume if (finaldst == NULL) 107078064Sume icmp6dst.sin6_addr = eip6->ip6_dst; 107178064Sume else 107278064Sume icmp6dst.sin6_addr = *finaldst; 1073148385Sume if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL)) 1074121315Sume goto freeit; 107578064Sume bzero(&icmp6src, sizeof(icmp6src)); 107678064Sume icmp6src.sin6_len = sizeof(struct sockaddr_in6); 107778064Sume icmp6src.sin6_family = AF_INET6; 107878064Sume icmp6src.sin6_addr = eip6->ip6_src; 1079148385Sume if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL)) 1080121315Sume goto freeit; 1081148385Sume icmp6src.sin6_flowinfo = 1082148385Sume (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 108378064Sume 108478064Sume if (finaldst == NULL) 108578064Sume finaldst = &eip6->ip6_dst; 108678064Sume ip6cp.ip6c_m = m; 108778064Sume ip6cp.ip6c_icmp6 = icmp6; 108878064Sume ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 108978064Sume ip6cp.ip6c_off = eoff; 109078064Sume ip6cp.ip6c_finaldst = finaldst; 109178064Sume ip6cp.ip6c_src = &icmp6src; 109278064Sume ip6cp.ip6c_nxt = nxt; 109378064Sume 109462587Sitojun if (icmp6type == ICMP6_PACKET_TOO_BIG) { 109578064Sume notifymtu = ntohl(icmp6->icmp6_mtu); 109678064Sume ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 109778064Sume icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/ 109862587Sitojun } 109962587Sitojun 1100175162Sobrien ctlfunc = (void (*)(int, struct sockaddr *, void *)) 1101120891Sume (inet6sw[ip6_protox[nxt]].pr_ctlinput); 110253541Sshin if (ctlfunc) { 110378064Sume (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, 1104120891Sume &ip6cp); 110553541Sshin } 110653541Sshin } 1107142681Sume *mp = m; 1108120856Sume return (0); 110953541Sshin 111078064Sume freeit: 111153541Sshin m_freem(m); 1112120856Sume return (-1); 111353541Sshin} 111453541Sshin 111578064Sumevoid 1116171259Sdelphijicmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 111762587Sitojun{ 111878064Sume struct in6_addr *dst = ip6cp->ip6c_finaldst; 111978064Sume struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 112078064Sume struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 112162587Sitojun u_int mtu = ntohl(icmp6->icmp6_mtu); 1122122922Sandre struct in_conninfo inc; 112362587Sitojun 1124121472Sume#if 0 1125121472Sume /* 1126121472Sume * RFC2460 section 5, last paragraph. 1127121472Sume * even though minimum link MTU for IPv6 is IPV6_MMTU, 1128121472Sume * we may see ICMPv6 too big with mtu < IPV6_MMTU 1129121472Sume * due to packet translator in the middle. 1130121472Sume * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for 1131121472Sume * special handling. 1132121472Sume */ 1133121472Sume if (mtu < IPV6_MMTU) 1134121472Sume return; 1135121472Sume#endif 1136121472Sume 1137121472Sume /* 1138121472Sume * we reject ICMPv6 too big with abnormally small value. 1139121472Sume * XXX what is the good definition of "abnormally small"? 1140121472Sume */ 1141121472Sume if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1142121472Sume return; 1143121472Sume 114478064Sume if (!validated) 114578064Sume return; 114678064Sume 1147182740Ssimon /* 1148182740Ssimon * In case the suggested mtu is less than IPV6_MMTU, we 1149182740Ssimon * only need to remember that it was for above mentioned 1150182740Ssimon * "alwaysfrag" case. 1151182740Ssimon * Try to be as close to the spec as possible. 1152182740Ssimon */ 1153182740Ssimon if (mtu < IPV6_MMTU) 1154182740Ssimon mtu = IPV6_MMTU - 8; 1155182740Ssimon 1156122922Sandre bzero(&inc, sizeof(inc)); 1157186222Sbz inc.inc_flags |= INC_ISIPV6; 1158122922Sandre inc.inc6_faddr = *dst; 1159148385Sume if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL)) 1160148385Sume return; 116162587Sitojun 1162162084Sandre if (mtu < tcp_maxmtu6(&inc, NULL)) { 1163122922Sandre tcp_hc_updatemtu(&inc, mtu); 1164190964Srwatson ICMP6STAT_INC(icp6s_pmtuchg); 116562587Sitojun } 116662587Sitojun} 116762587Sitojun 116853541Sshin/* 116978064Sume * Process a Node Information Query packet, based on 117078064Sume * draft-ietf-ipngwg-icmp-name-lookups-07. 1171120891Sume * 117262587Sitojun * Spec incompatibilities: 117362587Sitojun * - IPv6 Subject address handling 117462587Sitojun * - IPv4 Subject address handling support missing 117562587Sitojun * - Proxy reply (answer even if it's not for me) 117662587Sitojun * - joins NI group address at in6_ifattach() time only, does not cope 117762587Sitojun * with hostname changes by sethostname(3) 117853541Sshin */ 117953541Sshinstatic struct mbuf * 1180171259Sdelphijni6_input(struct mbuf *m, int off) 118153541Sshin{ 118262587Sitojun struct icmp6_nodeinfo *ni6, *nni6; 118353541Sshin struct mbuf *n = NULL; 1184193066Sjamie struct prison *pr; 118562587Sitojun u_int16_t qtype; 118662587Sitojun int subjlen; 118753541Sshin int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 118853541Sshin struct ni_reply_fqdn *fqdn; 118953541Sshin int addrs; /* for NI_QTYPE_NODEADDR */ 119053541Sshin struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1191148385Sume struct in6_addr in6_subj; /* subject address */ 119262587Sitojun struct ip6_hdr *ip6; 119362587Sitojun int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 119478064Sume char *subj = NULL; 119578064Sume struct in6_ifaddr *ia6 = NULL; 119653541Sshin 119762587Sitojun ip6 = mtod(m, struct ip6_hdr *); 119862587Sitojun#ifndef PULLDOWN_TEST 119962587Sitojun ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 120062587Sitojun#else 120162587Sitojun IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 120262587Sitojun if (ni6 == NULL) { 120362587Sitojun /* m is already reclaimed */ 1204120891Sume return (NULL); 120562587Sitojun } 120662587Sitojun#endif 120753541Sshin 120862587Sitojun /* 1209169664Sjinmei * Validate IPv6 source address. 1210169664Sjinmei * The default configuration MUST be to refuse answering queries from 1211169664Sjinmei * global-scope addresses according to RFC4602. 1212169664Sjinmei * Notes: 1213169664Sjinmei * - it's not very clear what "refuse" means; this implementation 1214169664Sjinmei * simply drops it. 1215169664Sjinmei * - it's not very easy to identify global-scope (unicast) addresses 1216169664Sjinmei * since there are many prefixes for them. It should be safer 1217169664Sjinmei * and in practice sufficient to check "all" but loopback and 1218169664Sjinmei * link-local (note that site-local unicast was deprecated and 1219169664Sjinmei * ULA is defined as global scope-wise) 1220169664Sjinmei */ 1221181803Sbz if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 && 1222169664Sjinmei !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) && 1223169664Sjinmei !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 1224169664Sjinmei goto bad; 1225169664Sjinmei 1226169664Sjinmei /* 122762587Sitojun * Validate IPv6 destination address. 122862587Sitojun * 122978064Sume * The Responder must discard the Query without further processing 123078064Sume * unless it is one of the Responder's unicast or anycast addresses, or 123178064Sume * a link-local scope multicast address which the Responder has joined. 1232169664Sjinmei * [RFC4602, Section 5.] 123362587Sitojun */ 1234121630Sume if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 1235121630Sume if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1236121630Sume goto bad; 1237121630Sume /* else it's a link-local multicast, fine */ 1238121630Sume } else { /* unicast or anycast */ 1239121630Sume if ((ia6 = ip6_getdstifaddr(m)) == NULL) 1240121630Sume goto bad; /* XXX impossible */ 1241121630Sume 1242121630Sume if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) && 1243181803Sbz !(V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) { 1244194760Srwatson ifa_free(&ia6->ia_ifa); 124578064Sume nd6log((LOG_DEBUG, "ni6_input: ignore node info to " 124678064Sume "a temporary address in %s:%d", 124778064Sume __FILE__, __LINE__)); 124878064Sume goto bad; 124978064Sume } 1250194760Srwatson ifa_free(&ia6->ia_ifa); 1251121630Sume } 125262587Sitojun 125378064Sume /* validate query Subject field. */ 125462587Sitojun qtype = ntohs(ni6->ni_qtype); 125562587Sitojun subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 125662587Sitojun switch (qtype) { 125762587Sitojun case NI_QTYPE_NOOP: 125862587Sitojun case NI_QTYPE_SUPTYPES: 125978064Sume /* 07 draft */ 126078064Sume if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 126178064Sume break; 126278064Sume /* FALLTHROUGH */ 126362587Sitojun case NI_QTYPE_FQDN: 126462587Sitojun case NI_QTYPE_NODEADDR: 1265151475Ssuz case NI_QTYPE_IPV4ADDR: 126662587Sitojun switch (ni6->ni_code) { 126762587Sitojun case ICMP6_NI_SUBJ_IPV6: 126862587Sitojun#if ICMP6_NI_SUBJ_IPV6 != 0 126962587Sitojun case 0: 127062587Sitojun#endif 127162587Sitojun /* 127262587Sitojun * backward compatibility - try to accept 03 draft 127362587Sitojun * format, where no Subject is present. 127462587Sitojun */ 127578064Sume if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 127678064Sume subjlen == 0) { 127762587Sitojun oldfqdn++; 127862587Sitojun break; 127962587Sitojun } 128078064Sume#if ICMP6_NI_SUBJ_IPV6 != 0 128178064Sume if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 128278064Sume goto bad; 128378064Sume#endif 128462587Sitojun 1285121630Sume if (subjlen != sizeof(struct in6_addr)) 128662587Sitojun goto bad; 128762587Sitojun 128862587Sitojun /* 128962587Sitojun * Validate Subject address. 129062587Sitojun * 129178064Sume * Not sure what exactly "address belongs to the node" 129278064Sume * means in the spec, is it just unicast, or what? 129362587Sitojun * 129462587Sitojun * At this moment we consider Subject address as 129562587Sitojun * "belong to the node" if the Subject address equals 129662587Sitojun * to the IPv6 destination address; validation for 129762587Sitojun * IPv6 destination address should have done enough 129862587Sitojun * check for us. 129962587Sitojun * 130062587Sitojun * We do not do proxy at this moment. 130162587Sitojun */ 130262587Sitojun /* m_pulldown instead of copy? */ 130362587Sitojun m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1304148385Sume subjlen, (caddr_t)&in6_subj); 1305148385Sume if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL)) 1306121315Sume goto bad; 1307121630Sume 1308148385Sume subj = (char *)&in6_subj; 1309148385Sume if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 131062587Sitojun break; 131178064Sume 131262587Sitojun /* 131362587Sitojun * XXX if we are to allow other cases, we should really 131462587Sitojun * be careful about scope here. 131562587Sitojun * basically, we should disallow queries toward IPv6 1316120891Sume * destination X with subject Y, 1317120891Sume * if scope(X) > scope(Y). 131862587Sitojun * if we allow scope(X) > scope(Y), it will result in 131962587Sitojun * information leakage across scope boundary. 132062587Sitojun */ 132162587Sitojun goto bad; 132262587Sitojun 132362587Sitojun case ICMP6_NI_SUBJ_FQDN: 132462587Sitojun /* 132562587Sitojun * Validate Subject name with gethostname(3). 132662587Sitojun * 132762587Sitojun * The behavior may need some debate, since: 132862587Sitojun * - we are not sure if the node has FQDN as 132962587Sitojun * hostname (returned by gethostname(3)). 133062587Sitojun * - the code does wildcard match for truncated names. 133162587Sitojun * however, we are not sure if we want to perform 133262587Sitojun * wildcard match, if gethostname(3) side has 133362587Sitojun * truncated hostname. 133462587Sitojun */ 1335193066Sjamie pr = curthread->td_ucred->cr_prison; 1336193066Sjamie mtx_lock(&pr->pr_mtx); 1337194118Sjamie n = ni6_nametodns(pr->pr_hostname, 1338194118Sjamie strlen(pr->pr_hostname), 0); 1339193066Sjamie mtx_unlock(&pr->pr_mtx); 134062587Sitojun if (!n || n->m_next || n->m_len == 0) 134162587Sitojun goto bad; 134262587Sitojun IP6_EXTHDR_GET(subj, char *, m, 134362587Sitojun off + sizeof(struct icmp6_nodeinfo), subjlen); 134462587Sitojun if (subj == NULL) 134562587Sitojun goto bad; 134662587Sitojun if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1347120891Sume n->m_len)) { 134862587Sitojun goto bad; 134962587Sitojun } 135062587Sitojun m_freem(n); 135162587Sitojun n = NULL; 135262587Sitojun break; 135362587Sitojun 135478064Sume case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 135562587Sitojun default: 135662587Sitojun goto bad; 135762587Sitojun } 135862587Sitojun break; 135978064Sume } 136062587Sitojun 136178064Sume /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 136278064Sume switch (qtype) { 136378064Sume case NI_QTYPE_FQDN: 1364181803Sbz if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0) 136578064Sume goto bad; 136678064Sume break; 136778064Sume case NI_QTYPE_NODEADDR: 1368151475Ssuz case NI_QTYPE_IPV4ADDR: 1369181803Sbz if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0) 137078064Sume goto bad; 137178064Sume break; 137278064Sume } 137378064Sume 137478064Sume /* guess reply length */ 137578064Sume switch (qtype) { 137678064Sume case NI_QTYPE_NOOP: 137778064Sume break; /* no reply data */ 137878064Sume case NI_QTYPE_SUPTYPES: 137978064Sume replylen += sizeof(u_int32_t); 138078064Sume break; 138178064Sume case NI_QTYPE_FQDN: 138278064Sume /* XXX will append an mbuf */ 138378064Sume replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 138478064Sume break; 138578064Sume case NI_QTYPE_NODEADDR: 1386148892Sume addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj); 138778064Sume if ((replylen += addrs * (sizeof(struct in6_addr) + 1388120891Sume sizeof(u_int32_t))) > MCLBYTES) 138978064Sume replylen = MCLBYTES; /* XXX: will truncate pkt later */ 139078064Sume break; 1391151475Ssuz case NI_QTYPE_IPV4ADDR: 1392151475Ssuz /* unsupported - should respond with unknown Qtype? */ 1393151475Ssuz break; 139462587Sitojun default: 139578064Sume /* 139678064Sume * XXX: We must return a reply with the ICMP6 code 1397120891Sume * `unknown Qtype' in this case. However we regard the case 139878064Sume * as an FQDN query for backward compatibility. 139978064Sume * Older versions set a random value to this field, 140078064Sume * so it rarely varies in the defined qtypes. 140178064Sume * But the mechanism is not reliable... 140278064Sume * maybe we should obsolete older versions. 140378064Sume */ 140478064Sume qtype = NI_QTYPE_FQDN; 140578064Sume /* XXX will append an mbuf */ 140678064Sume replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 140778064Sume oldfqdn++; 140878064Sume break; 140962587Sitojun } 141062587Sitojun 141178064Sume /* allocate an mbuf to reply. */ 1412111119Simp MGETHDR(n, M_DONTWAIT, m->m_type); 141362587Sitojun if (n == NULL) { 141462587Sitojun m_freem(m); 1415120856Sume return (NULL); 141662587Sitojun } 1417108466Ssam M_MOVE_PKTHDR(n, m); /* just for recvif */ 141853541Sshin if (replylen > MHLEN) { 141962587Sitojun if (replylen > MCLBYTES) { 142078064Sume /* 142178064Sume * XXX: should we try to allocate more? But MCLBYTES 142278064Sume * is probably much larger than IPV6_MMTU... 142378064Sume */ 142453541Sshin goto bad; 142562587Sitojun } 1426111119Simp MCLGET(n, M_DONTWAIT); 142753541Sshin if ((n->m_flags & M_EXT) == 0) { 142853541Sshin goto bad; 142953541Sshin } 143053541Sshin } 143153541Sshin n->m_pkthdr.len = n->m_len = replylen; 143253541Sshin 143353541Sshin /* copy mbuf header and IPv6 + Node Information base headers */ 143453541Sshin bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 143553541Sshin nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 143662587Sitojun bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 143753541Sshin 143853541Sshin /* qtype dependent procedure */ 143953541Sshin switch (qtype) { 144062587Sitojun case NI_QTYPE_NOOP: 144178064Sume nni6->ni_code = ICMP6_NI_SUCCESS; 144262587Sitojun nni6->ni_flags = 0; 144362587Sitojun break; 144462587Sitojun case NI_QTYPE_SUPTYPES: 144578064Sume { 144678064Sume u_int32_t v; 144778064Sume nni6->ni_code = ICMP6_NI_SUCCESS; 144878064Sume nni6->ni_flags = htons(0x0000); /* raw bitmap */ 144978064Sume /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 145078064Sume v = (u_int32_t)htonl(0x0000000f); 145178064Sume bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 145262587Sitojun break; 145378064Sume } 145462587Sitojun case NI_QTYPE_FQDN: 145578064Sume nni6->ni_code = ICMP6_NI_SUCCESS; 145662587Sitojun fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1457120891Sume sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo)); 145862587Sitojun nni6->ni_flags = 0; /* XXX: meaningless TTL */ 145962587Sitojun fqdn->ni_fqdn_ttl = 0; /* ditto. */ 146062587Sitojun /* 1461193066Sjamie * XXX do we really have FQDN in hostname? 146262587Sitojun */ 1463193066Sjamie pr = curthread->td_ucred->cr_prison; 1464193066Sjamie mtx_lock(&pr->pr_mtx); 1465194118Sjamie n->m_next = ni6_nametodns(pr->pr_hostname, 1466194118Sjamie strlen(pr->pr_hostname), oldfqdn); 1467193066Sjamie mtx_unlock(&pr->pr_mtx); 146862587Sitojun if (n->m_next == NULL) 146962587Sitojun goto bad; 147062587Sitojun /* XXX we assume that n->m_next is not a chain */ 147162587Sitojun if (n->m_next->m_next != NULL) 147262587Sitojun goto bad; 147362587Sitojun n->m_pkthdr.len += n->m_next->m_len; 147462587Sitojun break; 147562587Sitojun case NI_QTYPE_NODEADDR: 147662587Sitojun { 147762587Sitojun int lenlim, copied; 147853541Sshin 147978064Sume nni6->ni_code = ICMP6_NI_SUCCESS; 148078064Sume n->m_pkthdr.len = n->m_len = 148178064Sume sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 148278064Sume lenlim = M_TRAILINGSPACE(n); 148362587Sitojun copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 148462587Sitojun /* XXX: reset mbuf length */ 148562587Sitojun n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1486120891Sume sizeof(struct icmp6_nodeinfo) + copied; 148762587Sitojun break; 148853541Sshin } 148962587Sitojun default: 149062587Sitojun break; /* XXX impossible! */ 149162587Sitojun } 149253541Sshin 149353541Sshin nni6->ni_type = ICMP6_NI_REPLY; 149462587Sitojun m_freem(m); 1495120856Sume return (n); 149653541Sshin 149753541Sshin bad: 149862587Sitojun m_freem(m); 149953541Sshin if (n) 150053541Sshin m_freem(n); 1501120856Sume return (NULL); 150253541Sshin} 150353541Sshin 150453541Sshin/* 150562587Sitojun * make a mbuf with DNS-encoded string. no compression support. 150662587Sitojun * 150762587Sitojun * XXX names with less than 2 dots (like "foo" or "foo.section") will be 150862587Sitojun * treated as truncated name (two \0 at the end). this is a wild guess. 1509171259Sdelphij * 1510171259Sdelphij * old - return pascal string if non-zero 151162587Sitojun */ 151262587Sitojunstatic struct mbuf * 1513171259Sdelphijni6_nametodns(const char *name, int namelen, int old) 151462587Sitojun{ 151562587Sitojun struct mbuf *m; 151662587Sitojun char *cp, *ep; 151762587Sitojun const char *p, *q; 151862587Sitojun int i, len, nterm; 151962587Sitojun 152062587Sitojun if (old) 152162587Sitojun len = namelen + 1; 152262587Sitojun else 152362587Sitojun len = MCLBYTES; 152462587Sitojun 152562587Sitojun /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1526111119Simp MGET(m, M_DONTWAIT, MT_DATA); 152762587Sitojun if (m && len > MLEN) { 1528111119Simp MCLGET(m, M_DONTWAIT); 152962587Sitojun if ((m->m_flags & M_EXT) == 0) 153062587Sitojun goto fail; 153162587Sitojun } 153262587Sitojun if (!m) 153362587Sitojun goto fail; 153462587Sitojun m->m_next = NULL; 153562587Sitojun 153662587Sitojun if (old) { 153762587Sitojun m->m_len = len; 153862587Sitojun *mtod(m, char *) = namelen; 153962587Sitojun bcopy(name, mtod(m, char *) + 1, namelen); 154062587Sitojun return m; 154162587Sitojun } else { 154262587Sitojun m->m_len = 0; 154362587Sitojun cp = mtod(m, char *); 154462587Sitojun ep = mtod(m, char *) + M_TRAILINGSPACE(m); 154562587Sitojun 154662587Sitojun /* if not certain about my name, return empty buffer */ 154762587Sitojun if (namelen == 0) 154862587Sitojun return m; 154962587Sitojun 155062587Sitojun /* 155162587Sitojun * guess if it looks like shortened hostname, or FQDN. 155262587Sitojun * shortened hostname needs two trailing "\0". 155362587Sitojun */ 155462587Sitojun i = 0; 155562587Sitojun for (p = name; p < name + namelen; p++) { 155662587Sitojun if (*p && *p == '.') 155762587Sitojun i++; 155862587Sitojun } 155962587Sitojun if (i < 2) 156062587Sitojun nterm = 2; 156162587Sitojun else 156262587Sitojun nterm = 1; 156362587Sitojun 156462587Sitojun p = name; 156562587Sitojun while (cp < ep && p < name + namelen) { 156662587Sitojun i = 0; 156762587Sitojun for (q = p; q < name + namelen && *q && *q != '.'; q++) 156862587Sitojun i++; 156962587Sitojun /* result does not fit into mbuf */ 157062587Sitojun if (cp + i + 1 >= ep) 157162587Sitojun goto fail; 157278704Sume /* 157378704Sume * DNS label length restriction, RFC1035 page 8. 157478704Sume * "i == 0" case is included here to avoid returning 157578704Sume * 0-length label on "foo..bar". 157678704Sume */ 157778704Sume if (i <= 0 || i >= 64) 157862587Sitojun goto fail; 157962587Sitojun *cp++ = i; 158062587Sitojun bcopy(p, cp, i); 158162587Sitojun cp += i; 158262587Sitojun p = q; 158362587Sitojun if (p < name + namelen && *p == '.') 158462587Sitojun p++; 158562587Sitojun } 158662587Sitojun /* termination */ 158762587Sitojun if (cp + nterm >= ep) 158862587Sitojun goto fail; 158962587Sitojun while (nterm-- > 0) 159062587Sitojun *cp++ = '\0'; 159162587Sitojun m->m_len = cp - mtod(m, char *); 159262587Sitojun return m; 159362587Sitojun } 159462587Sitojun 159562587Sitojun panic("should not reach here"); 159695023Ssuz /* NOTREACHED */ 159762587Sitojun 159862587Sitojun fail: 159962587Sitojun if (m) 160062587Sitojun m_freem(m); 160162587Sitojun return NULL; 160262587Sitojun} 160362587Sitojun 160462587Sitojun/* 160562587Sitojun * check if two DNS-encoded string matches. takes care of truncated 160662587Sitojun * form (with \0\0 at the end). no compression support. 160778064Sume * XXX upper/lowercase match (see RFC2065) 160862587Sitojun */ 160962587Sitojunstatic int 1610171259Sdelphijni6_dnsmatch(const char *a, int alen, const char *b, int blen) 161162587Sitojun{ 161262587Sitojun const char *a0, *b0; 161362587Sitojun int l; 161462587Sitojun 161562587Sitojun /* simplest case - need validation? */ 161662587Sitojun if (alen == blen && bcmp(a, b, alen) == 0) 161762587Sitojun return 1; 161862587Sitojun 161962587Sitojun a0 = a; 162062587Sitojun b0 = b; 162162587Sitojun 162262587Sitojun /* termination is mandatory */ 162362587Sitojun if (alen < 2 || blen < 2) 162462587Sitojun return 0; 162562587Sitojun if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 162662587Sitojun return 0; 162762587Sitojun alen--; 162862587Sitojun blen--; 162962587Sitojun 163062587Sitojun while (a - a0 < alen && b - b0 < blen) { 163162587Sitojun if (a - a0 + 1 > alen || b - b0 + 1 > blen) 163262587Sitojun return 0; 163362587Sitojun 163462587Sitojun if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 163562587Sitojun return 0; 163662587Sitojun /* we don't support compression yet */ 163762587Sitojun if (a[0] >= 64 || b[0] >= 64) 163862587Sitojun return 0; 163962587Sitojun 164062587Sitojun /* truncated case */ 164162587Sitojun if (a[0] == 0 && a - a0 == alen - 1) 164262587Sitojun return 1; 164362587Sitojun if (b[0] == 0 && b - b0 == blen - 1) 164462587Sitojun return 1; 164562587Sitojun if (a[0] == 0 || b[0] == 0) 164662587Sitojun return 0; 164762587Sitojun 164862587Sitojun if (a[0] != b[0]) 164962587Sitojun return 0; 165062587Sitojun l = a[0]; 165162587Sitojun if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 165262587Sitojun return 0; 165362587Sitojun if (bcmp(a + 1, b + 1, l) != 0) 165462587Sitojun return 0; 165562587Sitojun 165662587Sitojun a += 1 + l; 165762587Sitojun b += 1 + l; 165862587Sitojun } 165962587Sitojun 166062587Sitojun if (a - a0 == alen && b - b0 == blen) 166162587Sitojun return 1; 166262587Sitojun else 166362587Sitojun return 0; 166462587Sitojun} 166562587Sitojun 166662587Sitojun/* 166753541Sshin * calculate the number of addresses to be returned in the node info reply. 166853541Sshin */ 166953541Sshinstatic int 1670171259Sdelphijni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp, 1671171259Sdelphij struct in6_addr *subj) 167253541Sshin{ 167378064Sume struct ifnet *ifp; 167478064Sume struct in6_ifaddr *ifa6; 167578064Sume struct ifaddr *ifa; 167653541Sshin int addrs = 0, addrsofif, iffound = 0; 167778064Sume int niflags = ni6->ni_flags; 167853541Sshin 167978064Sume if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 168078064Sume switch (ni6->ni_code) { 168178064Sume case ICMP6_NI_SUBJ_IPV6: 168278064Sume if (subj == NULL) /* must be impossible... */ 1683120856Sume return (0); 168478064Sume break; 168578064Sume default: 168678064Sume /* 168778064Sume * XXX: we only support IPv6 subject address for 168878064Sume * this Qtype. 168978064Sume */ 1690120856Sume return (0); 169178064Sume } 169278064Sume } 169378064Sume 1694108172Shsu IFNET_RLOCK(); 1695181803Sbz for (ifp = TAILQ_FIRST(&V_ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 169653541Sshin addrsofif = 0; 1697191317Srwatson IF_ADDR_LOCK(ifp); 1698191340Srwatson TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 169953541Sshin if (ifa->ifa_addr->sa_family != AF_INET6) 170053541Sshin continue; 170153541Sshin ifa6 = (struct in6_ifaddr *)ifa; 170253541Sshin 170378064Sume if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1704148892Sume IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr)) 170553541Sshin iffound = 1; 170653541Sshin 170762587Sitojun /* 170862587Sitojun * IPv4-mapped addresses can only be returned by a 170962587Sitojun * Node Information proxy, since they represent 171062587Sitojun * addresses of IPv4-only nodes, which perforce do 171162587Sitojun * not implement this protocol. 171278064Sume * [icmp-name-lookups-07, Section 5.4] 171362587Sitojun * So we don't support NI_NODEADDR_FLAG_COMPAT in 171462587Sitojun * this function at this moment. 171562587Sitojun */ 171662587Sitojun 171753541Sshin /* What do we have to do about ::1? */ 171878064Sume switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 171978064Sume case IPV6_ADDR_SCOPE_LINKLOCAL: 172078064Sume if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 172178064Sume continue; 172253541Sshin break; 172378064Sume case IPV6_ADDR_SCOPE_SITELOCAL: 172478064Sume if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 172578064Sume continue; 172653541Sshin break; 172778064Sume case IPV6_ADDR_SCOPE_GLOBAL: 172878064Sume if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 172978064Sume continue; 173078064Sume break; 173178064Sume default: 173278064Sume continue; 173353541Sshin } 173478064Sume 173578064Sume /* 173678064Sume * check if anycast is okay. 173795023Ssuz * XXX: just experimental. not in the spec. 173878064Sume */ 173978064Sume if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 174078064Sume (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 174178064Sume continue; /* we need only unicast addresses */ 174278064Sume if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1743181803Sbz (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) { 174478064Sume continue; 174578064Sume } 174678064Sume addrsofif++; /* count the address */ 174753541Sshin } 1748191317Srwatson IF_ADDR_UNLOCK(ifp); 174953541Sshin if (iffound) { 175053541Sshin *ifpp = ifp; 1751108172Shsu IFNET_RUNLOCK(); 1752120856Sume return (addrsofif); 175353541Sshin } 175453541Sshin 175553541Sshin addrs += addrsofif; 175653541Sshin } 1757108172Shsu IFNET_RUNLOCK(); 175853541Sshin 1759120856Sume return (addrs); 176053541Sshin} 176153541Sshin 176253541Sshinstatic int 1763171259Sdelphijni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6, 1764171259Sdelphij struct ifnet *ifp0, int resid) 176553541Sshin{ 1766181803Sbz struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&V_ifnet); 176778064Sume struct in6_ifaddr *ifa6; 176878064Sume struct ifaddr *ifa; 176978064Sume struct ifnet *ifp_dep = NULL; 177078064Sume int copied = 0, allow_deprecated = 0; 177153541Sshin u_char *cp = (u_char *)(nni6 + 1); 177278064Sume int niflags = ni6->ni_flags; 177378064Sume u_int32_t ltime; 177453541Sshin 177578064Sume if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1776120856Sume return (0); /* needless to copy */ 1777120891Sume 1778108172Shsu IFNET_RLOCK(); 177978064Sume again: 1780120892Sume 1781120891Sume for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 1782191317Srwatson IF_ADDR_LOCK(ifp); 1783191340Srwatson TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 178453541Sshin if (ifa->ifa_addr->sa_family != AF_INET6) 178553541Sshin continue; 178653541Sshin ifa6 = (struct in6_ifaddr *)ifa; 178753541Sshin 178878064Sume if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 178978064Sume allow_deprecated == 0) { 179078064Sume /* 179178064Sume * prefererred address should be put before 179278064Sume * deprecated addresses. 179378064Sume */ 179478064Sume 179578064Sume /* record the interface for later search */ 179678064Sume if (ifp_dep == NULL) 179778064Sume ifp_dep = ifp; 179878064Sume 179978064Sume continue; 1800120891Sume } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1801120891Sume allow_deprecated != 0) 180278064Sume continue; /* we now collect deprecated addrs */ 180353541Sshin 180453541Sshin /* What do we have to do about ::1? */ 180578064Sume switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 180678064Sume case IPV6_ADDR_SCOPE_LINKLOCAL: 180778064Sume if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 180878064Sume continue; 180953541Sshin break; 181078064Sume case IPV6_ADDR_SCOPE_SITELOCAL: 181178064Sume if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 181278064Sume continue; 181353541Sshin break; 181478064Sume case IPV6_ADDR_SCOPE_GLOBAL: 181578064Sume if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 181678064Sume continue; 181778064Sume break; 181878064Sume default: 181978064Sume continue; 182053541Sshin } 182153541Sshin 182278064Sume /* 182378064Sume * check if anycast is okay. 1824120891Sume * XXX: just experimental. not in the spec. 182578064Sume */ 182678064Sume if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 182778064Sume (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 182878064Sume continue; 182978064Sume if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1830181803Sbz (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) { 183178064Sume continue; 183253541Sshin } 183378064Sume 183478064Sume /* now we can copy the address */ 183578064Sume if (resid < sizeof(struct in6_addr) + 183678064Sume sizeof(u_int32_t)) { 1837191317Srwatson IF_ADDR_UNLOCK(ifp); 183878064Sume /* 183978064Sume * We give up much more copy. 184078064Sume * Set the truncate flag and return. 184178064Sume */ 1842120891Sume nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1843108172Shsu IFNET_RUNLOCK(); 1844120856Sume return (copied); 184578064Sume } 184678064Sume 184778064Sume /* 184878064Sume * Set the TTL of the address. 184978064Sume * The TTL value should be one of the following 185078064Sume * according to the specification: 185178064Sume * 185278064Sume * 1. The remaining lifetime of a DHCP lease on the 185378064Sume * address, or 185478064Sume * 2. The remaining Valid Lifetime of a prefix from 185578064Sume * which the address was derived through Stateless 185678064Sume * Autoconfiguration. 185778064Sume * 185878064Sume * Note that we currently do not support stateful 185978064Sume * address configuration by DHCPv6, so the former 186078064Sume * case can't happen. 186178064Sume */ 186278064Sume if (ifa6->ia6_lifetime.ia6t_expire == 0) 186378064Sume ltime = ND6_INFINITE_LIFETIME; 186478064Sume else { 186578064Sume if (ifa6->ia6_lifetime.ia6t_expire > 186678064Sume time_second) 186778064Sume ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second); 186878064Sume else 186978064Sume ltime = 0; 187078064Sume } 1871120891Sume 187278064Sume bcopy(<ime, cp, sizeof(u_int32_t)); 187378064Sume cp += sizeof(u_int32_t); 187478064Sume 187578064Sume /* copy the address itself */ 187678064Sume bcopy(&ifa6->ia_addr.sin6_addr, cp, 1877120891Sume sizeof(struct in6_addr)); 1878121315Sume in6_clearscope((struct in6_addr *)cp); /* XXX */ 187978064Sume cp += sizeof(struct in6_addr); 1880120891Sume 188178064Sume resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1882120891Sume copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 188353541Sshin } 1884191317Srwatson IF_ADDR_UNLOCK(ifp); 188553541Sshin if (ifp0) /* we need search only on the specified IF */ 188653541Sshin break; 188753541Sshin } 188853541Sshin 188978064Sume if (allow_deprecated == 0 && ifp_dep != NULL) { 189078064Sume ifp = ifp_dep; 189178064Sume allow_deprecated = 1; 189278064Sume 189378064Sume goto again; 189478064Sume } 189578064Sume 1896108172Shsu IFNET_RUNLOCK(); 1897108172Shsu 1898120856Sume return (copied); 189953541Sshin} 190053541Sshin 190153541Sshin/* 190253541Sshin * XXX almost dup'ed code with rip6_input. 190353541Sshin */ 190453541Sshinstatic int 1905171259Sdelphijicmp6_rip6_input(struct mbuf **mp, int off) 190653541Sshin{ 190753541Sshin struct mbuf *m = *mp; 190878064Sume struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1909186141Sbz struct inpcb *in6p; 1910186141Sbz struct inpcb *last = NULL; 1911121315Sume struct sockaddr_in6 fromsa; 191253541Sshin struct icmp6_hdr *icmp6; 191353541Sshin struct mbuf *opts = NULL; 191453541Sshin 191562587Sitojun#ifndef PULLDOWN_TEST 191653541Sshin /* this is assumed to be safe. */ 191753541Sshin icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 191862587Sitojun#else 191962587Sitojun IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 192062587Sitojun if (icmp6 == NULL) { 192162587Sitojun /* m is already reclaimed */ 1922120891Sume return (IPPROTO_DONE); 192362587Sitojun } 192462587Sitojun#endif 192553541Sshin 1926148385Sume /* 1927148385Sume * XXX: the address may have embedded scope zone ID, which should be 1928148385Sume * hidden from applications. 1929148385Sume */ 1930121315Sume bzero(&fromsa, sizeof(fromsa)); 1931148385Sume fromsa.sin6_family = AF_INET6; 1932121315Sume fromsa.sin6_len = sizeof(struct sockaddr_in6); 1933148385Sume fromsa.sin6_addr = ip6->ip6_src; 1934148385Sume if (sa6_recoverscope(&fromsa)) { 1935148385Sume m_freem(m); 1936148385Sume return (IPPROTO_DONE); 1937148385Sume } 193853541Sshin 1939181803Sbz INP_INFO_RLOCK(&V_ripcbinfo); 1940181803Sbz LIST_FOREACH(in6p, &V_ripcb, inp_list) { 1941180850Smav if ((in6p->inp_vflag & INP_IPV6) == 0) 194253541Sshin continue; 1943186141Sbz if (in6p->inp_ip_p != IPPROTO_ICMPV6) 1944180850Smav continue; 194553541Sshin if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 194653541Sshin !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1947180850Smav continue; 194853541Sshin if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 194953541Sshin !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1950180850Smav continue; 1951180932Smav INP_RLOCK(in6p); 1952180965Srwatson if (ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1953180965Srwatson in6p->in6p_icmp6filt)) { 1954180932Smav INP_RUNLOCK(in6p); 1955180850Smav continue; 1956180932Smav } 1957186163Skmacy if (last != NULL) { 1958121809Sume struct mbuf *n = NULL; 1959121809Sume 1960121809Sume /* 1961121809Sume * Recent network drivers tend to allocate a single 1962121809Sume * mbuf cluster, rather than to make a couple of 1963121809Sume * mbufs without clusters. Also, since the IPv6 code 1964121809Sume * path tries to avoid m_pullup(), it is highly 1965121809Sume * probable that we still have an mbuf cluster here 1966121809Sume * even though the necessary length can be stored in an 1967121809Sume * mbuf's internal buffer. 1968121809Sume * Meanwhile, the default size of the receive socket 1969121809Sume * buffer for raw sockets is not so large. This means 1970121809Sume * the possibility of packet loss is relatively higher 1971121809Sume * than before. To avoid this scenario, we copy the 1972121809Sume * received data to a separate mbuf that does not use 1973121809Sume * a cluster, if possible. 1974121809Sume * XXX: it is better to copy the data after stripping 1975121809Sume * intermediate headers. 1976121809Sume */ 1977121809Sume if ((m->m_flags & M_EXT) && m->m_next == NULL && 1978121809Sume m->m_len <= MHLEN) { 1979121809Sume MGET(n, M_DONTWAIT, m->m_type); 1980121809Sume if (n != NULL) { 1981145065Sgnn if (m_dup_pkthdr(n, m, M_NOWAIT)) { 1982171260Sdelphij bcopy(m->m_data, n->m_data, 1983145065Sgnn m->m_len); 1984145065Sgnn n->m_len = m->m_len; 1985145065Sgnn } else { 1986145065Sgnn m_free(n); 1987145065Sgnn n = NULL; 1988145065Sgnn } 1989121809Sume } 1990121809Sume } 1991121809Sume if (n != NULL || 1992121809Sume (n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1993186223Sbz if (last->inp_flags & INP_CONTROLOPTS) 1994121674Sume ip6_savecontrol(last, n, &opts); 199553541Sshin /* strip intermediate headers */ 199653541Sshin m_adj(n, off); 1997186141Sbz SOCKBUF_LOCK(&last->inp_socket->so_rcv); 1998160591Srwatson if (sbappendaddr_locked( 1999186141Sbz &last->inp_socket->so_rcv, 2000121315Sume (struct sockaddr *)&fromsa, n, opts) 2001120891Sume == 0) { 200253541Sshin /* should notify about lost packet */ 200353541Sshin m_freem(n); 200478064Sume if (opts) { 200553541Sshin m_freem(opts); 200678064Sume } 2007160591Srwatson SOCKBUF_UNLOCK( 2008186141Sbz &last->inp_socket->so_rcv); 200997658Stanimura } else 2010186141Sbz sorwakeup_locked(last->inp_socket); 201153541Sshin opts = NULL; 201253541Sshin } 2013178378Srwatson INP_RUNLOCK(last); 201453541Sshin } 201553541Sshin last = in6p; 201653541Sshin } 2017181803Sbz INP_INFO_RUNLOCK(&V_ripcbinfo); 2018186163Skmacy if (last != NULL) { 2019186223Sbz if (last->inp_flags & INP_CONTROLOPTS) 2020121674Sume ip6_savecontrol(last, m, &opts); 202153541Sshin /* strip intermediate headers */ 202253541Sshin m_adj(m, off); 2023121809Sume 2024121809Sume /* avoid using mbuf clusters if possible (see above) */ 2025121809Sume if ((m->m_flags & M_EXT) && m->m_next == NULL && 2026121809Sume m->m_len <= MHLEN) { 2027121809Sume struct mbuf *n; 2028121809Sume 2029121809Sume MGET(n, M_DONTWAIT, m->m_type); 2030121809Sume if (n != NULL) { 2031145065Sgnn if (m_dup_pkthdr(n, m, M_NOWAIT)) { 2032145065Sgnn bcopy(m->m_data, n->m_data, m->m_len); 2033145065Sgnn n->m_len = m->m_len; 2034171260Sdelphij 2035145065Sgnn m_freem(m); 2036145065Sgnn m = n; 2037145065Sgnn } else { 2038145065Sgnn m_freem(n); 2039145065Sgnn n = NULL; 2040145065Sgnn } 2041121809Sume } 2042121809Sume } 2043186141Sbz SOCKBUF_LOCK(&last->inp_socket->so_rcv); 2044186141Sbz if (sbappendaddr_locked(&last->inp_socket->so_rcv, 2045121315Sume (struct sockaddr *)&fromsa, m, opts) == 0) { 204653541Sshin m_freem(m); 204753541Sshin if (opts) 204853541Sshin m_freem(opts); 2049186141Sbz SOCKBUF_UNLOCK(&last->inp_socket->so_rcv); 205097658Stanimura } else 2051186141Sbz sorwakeup_locked(last->inp_socket); 2052178378Srwatson INP_RUNLOCK(last); 205353541Sshin } else { 205453541Sshin m_freem(m); 2055191672Sbms IP6STAT_DEC(ip6s_delivered); 205653541Sshin } 205753541Sshin return IPPROTO_DONE; 205853541Sshin} 205953541Sshin 206053541Sshin/* 206153541Sshin * Reflect the ip6 packet back to the source. 206262587Sitojun * OFF points to the icmp6 header, counted from the top of the mbuf. 206353541Sshin */ 206453541Sshinvoid 2065171259Sdelphijicmp6_reflect(struct mbuf *m, size_t off) 206653541Sshin{ 206762587Sitojun struct ip6_hdr *ip6; 206853541Sshin struct icmp6_hdr *icmp6; 2069194760Srwatson struct in6_ifaddr *ia = NULL; 207062587Sitojun int plen; 207153541Sshin int type, code; 207253541Sshin struct ifnet *outif = NULL; 2073194777Sbz struct in6_addr origdst, src, *srcp = NULL; 207453541Sshin 207562587Sitojun /* too short to reflect */ 207662587Sitojun if (off < sizeof(struct ip6_hdr)) { 207778064Sume nd6log((LOG_DEBUG, 207878064Sume "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 207978064Sume (u_long)off, (u_long)sizeof(struct ip6_hdr), 208078064Sume __FILE__, __LINE__)); 208162587Sitojun goto bad; 208262587Sitojun } 208362587Sitojun 208453541Sshin /* 208553541Sshin * If there are extra headers between IPv6 and ICMPv6, strip 208653541Sshin * off that header first. 208753541Sshin */ 208862587Sitojun#ifdef DIAGNOSTIC 208962587Sitojun if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 209062587Sitojun panic("assumption failed in icmp6_reflect"); 209162587Sitojun#endif 209262587Sitojun if (off > sizeof(struct ip6_hdr)) { 209362587Sitojun size_t l; 209462587Sitojun struct ip6_hdr nip6; 209553541Sshin 209662587Sitojun l = off - sizeof(struct ip6_hdr); 209762587Sitojun m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 209862587Sitojun m_adj(m, l); 209962587Sitojun l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 210062587Sitojun if (m->m_len < l) { 210162587Sitojun if ((m = m_pullup(m, l)) == NULL) 210262587Sitojun return; 210353541Sshin } 210462587Sitojun bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 210562587Sitojun } else /* off == sizeof(struct ip6_hdr) */ { 210662587Sitojun size_t l; 210762587Sitojun l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 210862587Sitojun if (m->m_len < l) { 210962587Sitojun if ((m = m_pullup(m, l)) == NULL) 211062587Sitojun return; 211153541Sshin } 211253541Sshin } 211362587Sitojun plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 211462587Sitojun ip6 = mtod(m, struct ip6_hdr *); 211562587Sitojun ip6->ip6_nxt = IPPROTO_ICMPV6; 211653541Sshin icmp6 = (struct icmp6_hdr *)(ip6 + 1); 211753541Sshin type = icmp6->icmp6_type; /* keep type for statistics */ 211853541Sshin code = icmp6->icmp6_code; /* ditto. */ 211953541Sshin 2120148385Sume origdst = ip6->ip6_dst; 212153541Sshin /* 212253541Sshin * ip6_input() drops a packet if its src is multicast. 212353541Sshin * So, the src is never multicast. 212453541Sshin */ 212553541Sshin ip6->ip6_dst = ip6->ip6_src; 212653541Sshin 212753541Sshin /* 2128120891Sume * If the incoming packet was addressed directly to us (i.e. unicast), 212953541Sshin * use dst as the src for the reply. 2130120891Sume * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 213162587Sitojun * (for example) when we encounter an error while forwarding procedure 213262587Sitojun * destined to a duplicated address of ours. 2133148385Sume * Note that ip6_getdstifaddr() may fail if we are in an error handling 2134148385Sume * procedure of an outgoing packet of our own, in which case we need 2135148385Sume * to search in the ifaddr list. 213653541Sshin */ 2137148385Sume if (!IN6_IS_ADDR_MULTICAST(&origdst)) { 2138148385Sume if ((ia = ip6_getdstifaddr(m))) { 2139148385Sume if (!(ia->ia6_flags & 2140148385Sume (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) 2141194777Sbz srcp = &ia->ia_addr.sin6_addr; 2142148385Sume } else { 2143148385Sume struct sockaddr_in6 d; 2144148385Sume 2145148385Sume bzero(&d, sizeof(d)); 2146148385Sume d.sin6_family = AF_INET6; 2147148385Sume d.sin6_len = sizeof(d); 2148148385Sume d.sin6_addr = origdst; 2149148385Sume ia = (struct in6_ifaddr *) 2150148385Sume ifa_ifwithaddr((struct sockaddr *)&d); 2151148385Sume if (ia && 2152148385Sume !(ia->ia6_flags & 2153148385Sume (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) { 2154194777Sbz srcp = &ia->ia_addr.sin6_addr; 2155148385Sume } 215653541Sshin } 215753541Sshin } 215853541Sshin 2159194777Sbz if (srcp == NULL) { 216078064Sume int e; 2161148385Sume struct sockaddr_in6 sin6; 216278064Sume struct route_in6 ro; 216378064Sume 216453541Sshin /* 216562587Sitojun * This case matches to multicasts, our anycast, or unicasts 216695023Ssuz * that we do not own. Select a source address based on the 216778064Sume * source address of the erroneous packet. 216853541Sshin */ 2169148385Sume bzero(&sin6, sizeof(sin6)); 2170148385Sume sin6.sin6_family = AF_INET6; 2171148385Sume sin6.sin6_len = sizeof(sin6); 2172148385Sume sin6.sin6_addr = ip6->ip6_dst; /* zone ID should be embedded */ 2173148385Sume 217478064Sume bzero(&ro, sizeof(ro)); 2175194777Sbz e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, &outif, &src); 217678064Sume if (ro.ro_rt) 217778064Sume RTFREE(ro.ro_rt); /* XXX: we could use this */ 2178194777Sbz if (e) { 2179165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 218078064Sume nd6log((LOG_DEBUG, 218178064Sume "icmp6_reflect: source can't be determined: " 218278064Sume "dst=%s, error=%d\n", 2183165118Sbz ip6_sprintf(ip6buf, &sin6.sin6_addr), e)); 218478064Sume goto bad; 218578064Sume } 2186194777Sbz srcp = &src; 218778064Sume } 218853541Sshin 2189194777Sbz ip6->ip6_src = *srcp; 219053541Sshin ip6->ip6_flow = 0; 219162587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 219262587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 219353541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 2194121472Sume if (outif) 2195121472Sume ip6->ip6_hlim = ND_IFINFO(outif)->chlim; 2196121472Sume else if (m->m_pkthdr.rcvif) { 219753541Sshin /* XXX: This may not be the outgoing interface */ 2198121161Sume ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim; 219978064Sume } else 2200181803Sbz ip6->ip6_hlim = V_ip6_defhlim; 220153541Sshin 220253541Sshin icmp6->icmp6_cksum = 0; 220353541Sshin icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2204120891Sume sizeof(struct ip6_hdr), plen); 220553541Sshin 220653541Sshin /* 220778064Sume * XXX option handling 220853541Sshin */ 220953541Sshin 221053541Sshin m->m_flags &= ~(M_BCAST|M_MCAST); 221153541Sshin 2212105194Ssam ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 221353541Sshin if (outif) 221453541Sshin icmp6_ifoutstat_inc(outif, type, code); 221553541Sshin 2216194760Srwatson if (ia != NULL) 2217194760Srwatson ifa_free(&ia->ia_ifa); 221853541Sshin return; 221953541Sshin 222053541Sshin bad: 2221194760Srwatson if (ia != NULL) 2222194760Srwatson ifa_free(&ia->ia_ifa); 222353541Sshin m_freem(m); 222453541Sshin return; 222553541Sshin} 222653541Sshin 222753541Sshinvoid 2228171259Sdelphijicmp6_fasttimo(void) 222953541Sshin{ 223062587Sitojun 2231191672Sbms mld_fasttimo(); 223253541Sshin} 223353541Sshin 2234191672Sbmsvoid 2235191672Sbmsicmp6_slowtimo(void) 2236191672Sbms{ 2237191672Sbms 2238191672Sbms mld_slowtimo(); 2239191672Sbms} 2240191672Sbms 224153541Sshinstatic const char * 2242171259Sdelphijicmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6, 2243171259Sdelphij struct in6_addr *tgt6) 224453541Sshin{ 224553541Sshin static char buf[1024]; 2246165118Sbz char ip6bufs[INET6_ADDRSTRLEN]; 2247165118Sbz char ip6bufd[INET6_ADDRSTRLEN]; 2248165118Sbz char ip6buft[INET6_ADDRSTRLEN]; 224953541Sshin snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2250165118Sbz ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6), 2251165118Sbz ip6_sprintf(ip6buft, tgt6)); 225253541Sshin return buf; 225353541Sshin} 225453541Sshin 225553541Sshinvoid 2256171259Sdelphijicmp6_redirect_input(struct mbuf *m, int off) 225753541Sshin{ 2258171133Sgnn struct ifnet *ifp; 225953541Sshin struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 226062587Sitojun struct nd_redirect *nd_rd; 226153541Sshin int icmp6len = ntohs(ip6->ip6_plen); 226253541Sshin char *lladdr = NULL; 226353541Sshin int lladdrlen = 0; 226453541Sshin u_char *redirhdr = NULL; 226553541Sshin int redirhdrlen = 0; 226653541Sshin struct rtentry *rt = NULL; 226753541Sshin int is_router; 226853541Sshin int is_onlink; 226953541Sshin struct in6_addr src6 = ip6->ip6_src; 227062587Sitojun struct in6_addr redtgt6; 227162587Sitojun struct in6_addr reddst6; 227253541Sshin union nd_opts ndopts; 2273165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 227453541Sshin 2275171133Sgnn if (!m) 227653541Sshin return; 227753541Sshin 2278171133Sgnn ifp = m->m_pkthdr.rcvif; 2279171133Sgnn 2280171133Sgnn if (!ifp) 2281171133Sgnn return; 2282171133Sgnn 228353541Sshin /* XXX if we are router, we don't update route by icmp6 redirect */ 2284181803Sbz if (V_ip6_forwarding) 228562587Sitojun goto freeit; 2286181803Sbz if (!V_icmp6_rediraccept) 228762587Sitojun goto freeit; 228862587Sitojun 228962587Sitojun#ifndef PULLDOWN_TEST 229062587Sitojun IP6_EXTHDR_CHECK(m, off, icmp6len,); 229162587Sitojun nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 229262587Sitojun#else 229362587Sitojun IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 229462587Sitojun if (nd_rd == NULL) { 2295190964Srwatson ICMP6STAT_INC(icp6s_tooshort); 229653541Sshin return; 229762587Sitojun } 229862587Sitojun#endif 229962587Sitojun redtgt6 = nd_rd->nd_rd_target; 230062587Sitojun reddst6 = nd_rd->nd_rd_dst; 230153541Sshin 2302148385Sume if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) || 2303148385Sume in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) { 2304148385Sume goto freeit; 2305148385Sume } 230653541Sshin 230753541Sshin /* validation */ 230853541Sshin if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 230978064Sume nd6log((LOG_ERR, 2310120891Sume "ICMP6 redirect sent from %s rejected; " 2311120891Sume "must be from linklocal\n", 2312165118Sbz ip6_sprintf(ip6buf, &src6))); 231378064Sume goto bad; 231453541Sshin } 231553541Sshin if (ip6->ip6_hlim != 255) { 231678064Sume nd6log((LOG_ERR, 2317120891Sume "ICMP6 redirect sent from %s rejected; " 2318120891Sume "hlim=%d (must be 255)\n", 2319165118Sbz ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim)); 232078064Sume goto bad; 232153541Sshin } 232253541Sshin { 232353541Sshin /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 232453541Sshin struct sockaddr_in6 sin6; 232553541Sshin struct in6_addr *gw6; 232653541Sshin 232753541Sshin bzero(&sin6, sizeof(sin6)); 232853541Sshin sin6.sin6_family = AF_INET6; 232953541Sshin sin6.sin6_len = sizeof(struct sockaddr_in6); 233053541Sshin bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 233153541Sshin rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 233253541Sshin if (rt) { 233365895Sume if (rt->rt_gateway == NULL || 233465895Sume rt->rt_gateway->sa_family != AF_INET6) { 233578064Sume nd6log((LOG_ERR, 233665895Sume "ICMP6 redirect rejected; no route " 233765895Sume "with inet6 gateway found for redirect dst: %s\n", 233878064Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2339120727Ssam RTFREE_LOCKED(rt); 234078064Sume goto bad; 234165895Sume } 234265895Sume 234353541Sshin gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 234453541Sshin if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 234578064Sume nd6log((LOG_ERR, 2346120891Sume "ICMP6 redirect rejected; " 2347120891Sume "not equal to gw-for-src=%s (must be same): " 2348120891Sume "%s\n", 2349165118Sbz ip6_sprintf(ip6buf, gw6), 2350120891Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2351120727Ssam RTFREE_LOCKED(rt); 235278064Sume goto bad; 235353541Sshin } 235453541Sshin } else { 235578064Sume nd6log((LOG_ERR, 2356120891Sume "ICMP6 redirect rejected; " 2357120891Sume "no route found for redirect dst: %s\n", 2358120891Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 235978064Sume goto bad; 236053541Sshin } 2361120727Ssam RTFREE_LOCKED(rt); 236253541Sshin rt = NULL; 236353541Sshin } 236453541Sshin if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 236578064Sume nd6log((LOG_ERR, 2366120891Sume "ICMP6 redirect rejected; " 2367120891Sume "redirect dst must be unicast: %s\n", 2368120891Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 236978064Sume goto bad; 237053541Sshin } 237153541Sshin 237253541Sshin is_router = is_onlink = 0; 237353541Sshin if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 237453541Sshin is_router = 1; /* router case */ 237553541Sshin if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 237653541Sshin is_onlink = 1; /* on-link destination case */ 237753541Sshin if (!is_router && !is_onlink) { 237878064Sume nd6log((LOG_ERR, 2379120891Sume "ICMP6 redirect rejected; " 2380120891Sume "neither router case nor onlink case: %s\n", 2381120891Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 238278064Sume goto bad; 238353541Sshin } 238453541Sshin /* validation passed */ 238553541Sshin 238653541Sshin icmp6len -= sizeof(*nd_rd); 238753541Sshin nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 238853541Sshin if (nd6_options(&ndopts) < 0) { 238978064Sume nd6log((LOG_INFO, "icmp6_redirect_input: " 2390120891Sume "invalid ND option, rejected: %s\n", 2391120891Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 239278064Sume /* nd6_options have incremented stats */ 239362587Sitojun goto freeit; 239453541Sshin } 239553541Sshin 239653541Sshin if (ndopts.nd_opts_tgt_lladdr) { 239753541Sshin lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 239853541Sshin lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 239953541Sshin } 240053541Sshin 240153541Sshin if (ndopts.nd_opts_rh) { 240253541Sshin redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 240353541Sshin redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 240453541Sshin } 240553541Sshin 240653541Sshin if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 240778064Sume nd6log((LOG_INFO, 2408120891Sume "icmp6_redirect_input: lladdrlen mismatch for %s " 2409120891Sume "(if %d, icmp6 packet %d): %s\n", 2410165118Sbz ip6_sprintf(ip6buf, &redtgt6), 2411165118Sbz ifp->if_addrlen, lladdrlen - 2, 2412120891Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 241378064Sume goto bad; 241453541Sshin } 241553541Sshin 241653541Sshin /* RFC 2461 8.3 */ 241753541Sshin nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2418120891Sume is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 241953541Sshin 242095023Ssuz if (!is_onlink) { /* better router case. perform rtredirect. */ 242153541Sshin /* perform rtredirect */ 242253541Sshin struct sockaddr_in6 sdst; 242353541Sshin struct sockaddr_in6 sgw; 242453541Sshin struct sockaddr_in6 ssrc; 242553541Sshin 242653541Sshin bzero(&sdst, sizeof(sdst)); 242753541Sshin bzero(&sgw, sizeof(sgw)); 242853541Sshin bzero(&ssrc, sizeof(ssrc)); 242953541Sshin sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 243053541Sshin sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 243153541Sshin sizeof(struct sockaddr_in6); 243253541Sshin bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 243353541Sshin bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 243453541Sshin bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 243553541Sshin rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2436120891Sume (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 2437120891Sume (struct sockaddr *)&ssrc); 243853541Sshin } 243953541Sshin /* finally update cached route in each socket via pfctlinput */ 244053541Sshin { 244153541Sshin struct sockaddr_in6 sdst; 244253541Sshin 244353541Sshin bzero(&sdst, sizeof(sdst)); 244453541Sshin sdst.sin6_family = AF_INET6; 244553541Sshin sdst.sin6_len = sizeof(struct sockaddr_in6); 244653541Sshin bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 244753541Sshin pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2448171167Sgnn#ifdef IPSEC 244953541Sshin key_sa_routechange((struct sockaddr *)&sdst); 2450171167Sgnn#endif /* IPSEC */ 245153541Sshin } 245262587Sitojun 245362587Sitojun freeit: 245462587Sitojun m_freem(m); 245578064Sume return; 245678064Sume 245778064Sume bad: 2458190964Srwatson ICMP6STAT_INC(icp6s_badredirect); 245978064Sume m_freem(m); 246053541Sshin} 246153541Sshin 246253541Sshinvoid 2463171259Sdelphijicmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 246453541Sshin{ 246553541Sshin struct ifnet *ifp; /* my outgoing interface */ 246653541Sshin struct in6_addr *ifp_ll6; 246753541Sshin struct in6_addr *router_ll6; 246853541Sshin struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 246953541Sshin struct mbuf *m = NULL; /* newly allocated one */ 247053541Sshin struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 247153541Sshin struct nd_redirect *nd_rd; 2472186157Skmacy struct llentry *ln = NULL; 247353541Sshin size_t maxlen; 247453541Sshin u_char *p; 247553541Sshin struct ifnet *outif = NULL; 247662587Sitojun struct sockaddr_in6 src_sa; 247753541Sshin 2478181803Sbz icmp6_errcount(&V_icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 247962587Sitojun 248053541Sshin /* if we are not router, we don't send icmp6 redirect */ 2481181803Sbz if (!V_ip6_forwarding) 248253541Sshin goto fail; 248353541Sshin 248453541Sshin /* sanity check */ 248553541Sshin if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 248653541Sshin goto fail; 248753541Sshin 248853541Sshin /* 248953541Sshin * Address check: 249053541Sshin * the source address must identify a neighbor, and 249153541Sshin * the destination address must not be a multicast address 249253541Sshin * [RFC 2461, sec 8.2] 249353541Sshin */ 249453541Sshin sip6 = mtod(m0, struct ip6_hdr *); 249562587Sitojun bzero(&src_sa, sizeof(src_sa)); 249662587Sitojun src_sa.sin6_family = AF_INET6; 249762587Sitojun src_sa.sin6_len = sizeof(src_sa); 249862587Sitojun src_sa.sin6_addr = sip6->ip6_src; 249962587Sitojun if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 250053541Sshin goto fail; 250153541Sshin if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 250253541Sshin goto fail; /* what should we do here? */ 250353541Sshin 250453541Sshin /* rate limit */ 250553541Sshin if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 250653541Sshin goto fail; 250753541Sshin 250853541Sshin /* 250953541Sshin * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 251053541Sshin * we almost always ask for an mbuf cluster for simplicity. 251153541Sshin * (MHLEN < IPV6_MMTU is almost always true) 251253541Sshin */ 251362587Sitojun#if IPV6_MMTU >= MCLBYTES 251462587Sitojun# error assumption failed about IPV6_MMTU and MCLBYTES 251562587Sitojun#endif 2516111119Simp MGETHDR(m, M_DONTWAIT, MT_HEADER); 251762587Sitojun if (m && IPV6_MMTU >= MHLEN) 2518111119Simp MCLGET(m, M_DONTWAIT); 251953541Sshin if (!m) 252053541Sshin goto fail; 252178064Sume m->m_pkthdr.rcvif = NULL; 252278064Sume m->m_len = 0; 252378064Sume maxlen = M_TRAILINGSPACE(m); 252453541Sshin maxlen = min(IPV6_MMTU, maxlen); 252553541Sshin /* just for safety */ 252662587Sitojun if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 252762587Sitojun ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 252853541Sshin goto fail; 252962587Sitojun } 253053541Sshin 253153541Sshin { 253253541Sshin /* get ip6 linklocal address for ifp(my outgoing interface). */ 253362587Sitojun struct in6_ifaddr *ia; 253462587Sitojun if ((ia = in6ifa_ifpforlinklocal(ifp, 253562587Sitojun IN6_IFF_NOTREADY| 253662587Sitojun IN6_IFF_ANYCAST)) == NULL) 253753541Sshin goto fail; 253853541Sshin ifp_ll6 = &ia->ia_addr.sin6_addr; 2539194760Srwatson /* XXXRW: reference released prematurely. */ 2540194760Srwatson ifa_free(&ia->ia_ifa); 254153541Sshin } 254253541Sshin 254353541Sshin /* get ip6 linklocal address for the router. */ 254453541Sshin if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 254553541Sshin struct sockaddr_in6 *sin6; 254653541Sshin sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 254753541Sshin router_ll6 = &sin6->sin6_addr; 254853541Sshin if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 254953541Sshin router_ll6 = (struct in6_addr *)NULL; 255053541Sshin } else 255153541Sshin router_ll6 = (struct in6_addr *)NULL; 255253541Sshin 255353541Sshin /* ip6 */ 255453541Sshin ip6 = mtod(m, struct ip6_hdr *); 255553541Sshin ip6->ip6_flow = 0; 255662587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 255762587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 255853541Sshin /* ip6->ip6_plen will be set later */ 255953541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 256053541Sshin ip6->ip6_hlim = 255; 256153541Sshin /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 256253541Sshin bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 256353541Sshin bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 256453541Sshin 256553541Sshin /* ND Redirect */ 256653541Sshin nd_rd = (struct nd_redirect *)(ip6 + 1); 256753541Sshin nd_rd->nd_rd_type = ND_REDIRECT; 256853541Sshin nd_rd->nd_rd_code = 0; 256953541Sshin nd_rd->nd_rd_reserved = 0; 257053541Sshin if (rt->rt_flags & RTF_GATEWAY) { 257153541Sshin /* 257253541Sshin * nd_rd->nd_rd_target must be a link-local address in 257353541Sshin * better router cases. 257453541Sshin */ 257553541Sshin if (!router_ll6) 257653541Sshin goto fail; 257753541Sshin bcopy(router_ll6, &nd_rd->nd_rd_target, 2578120892Sume sizeof(nd_rd->nd_rd_target)); 257953541Sshin bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2580120892Sume sizeof(nd_rd->nd_rd_dst)); 258153541Sshin } else { 258253541Sshin /* make sure redtgt == reddst */ 258353541Sshin bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2584120892Sume sizeof(nd_rd->nd_rd_target)); 258553541Sshin bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2586120892Sume sizeof(nd_rd->nd_rd_dst)); 258753541Sshin } 258853541Sshin 258953541Sshin p = (u_char *)(nd_rd + 1); 259053541Sshin 259153541Sshin if (!router_ll6) 259253541Sshin goto nolladdropt; 259353541Sshin 2594120892Sume { 2595120892Sume /* target lladdr option */ 2596120892Sume int len; 2597120892Sume struct nd_opt_hdr *nd_opt; 2598120892Sume char *lladdr; 259953541Sshin 2600186119Sqingli IF_AFDATA_LOCK(ifp); 2601186119Sqingli ln = nd6_lookup(router_ll6, 0, ifp); 2602186119Sqingli IF_AFDATA_UNLOCK(ifp); 2603186157Skmacy if (ln == NULL) 2604120892Sume goto nolladdropt; 2605186119Sqingli 2606120892Sume len = sizeof(*nd_opt) + ifp->if_addrlen; 2607120892Sume len = (len + 7) & ~7; /* round by 8 */ 2608120892Sume /* safety check */ 2609186157Skmacy if (len + (p - (u_char *)ip6) > maxlen) 2610120892Sume goto nolladdropt; 2611186119Sqingli 2612186119Sqingli if (ln->la_flags & LLE_VALID) { 2613120892Sume nd_opt = (struct nd_opt_hdr *)p; 2614120892Sume nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2615120892Sume nd_opt->nd_opt_len = len >> 3; 2616120892Sume lladdr = (char *)(nd_opt + 1); 2617186119Sqingli bcopy(&ln->ll_addr, lladdr, ifp->if_addrlen); 2618120892Sume p += len; 2619120892Sume } 2620186157Skmacy } 2621186157Skmacynolladdropt: 2622186157Skmacy if (ln != NULL) 2623186119Sqingli LLE_RUNLOCK(ln); 2624186157Skmacy 262553541Sshin m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 262653541Sshin 262753541Sshin /* just to be safe */ 262862587Sitojun#ifdef M_DECRYPTED /*not openbsd*/ 262953541Sshin if (m0->m_flags & M_DECRYPTED) 263053541Sshin goto noredhdropt; 263162587Sitojun#endif 263262587Sitojun if (p - (u_char *)ip6 > maxlen) 263362587Sitojun goto noredhdropt; 263453541Sshin 2635120891Sume { 2636120891Sume /* redirected header option */ 2637120891Sume int len; 2638120891Sume struct nd_opt_rd_hdr *nd_opt_rh; 263953541Sshin 2640120891Sume /* 2641120891Sume * compute the maximum size for icmp6 redirect header option. 2642120891Sume * XXX room for auth header? 2643120891Sume */ 2644120891Sume len = maxlen - (p - (u_char *)ip6); 2645120891Sume len &= ~7; 264653541Sshin 2647120891Sume /* This is just for simplicity. */ 2648120891Sume if (m0->m_pkthdr.len != m0->m_len) { 2649120891Sume if (m0->m_next) { 2650120891Sume m_freem(m0->m_next); 2651120891Sume m0->m_next = NULL; 2652120891Sume } 2653120891Sume m0->m_pkthdr.len = m0->m_len; 265453541Sshin } 265553541Sshin 2656120891Sume /* 2657120891Sume * Redirected header option spec (RFC2461 4.6.3) talks nothing 2658120891Sume * about padding/truncate rule for the original IP packet. 2659120891Sume * From the discussion on IPv6imp in Feb 1999, 2660120891Sume * the consensus was: 2661120891Sume * - "attach as much as possible" is the goal 2662120891Sume * - pad if not aligned (original size can be guessed by 2663120891Sume * original ip6 header) 2664120891Sume * Following code adds the padding if it is simple enough, 2665120891Sume * and truncates if not. 2666120891Sume */ 2667120891Sume if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 2668120891Sume panic("assumption failed in %s:%d", __FILE__, 2669120891Sume __LINE__); 267053541Sshin 2671120891Sume if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2672120891Sume /* not enough room, truncate */ 2673120891Sume m0->m_pkthdr.len = m0->m_len = len - 2674120891Sume sizeof(*nd_opt_rh); 2675120891Sume } else { 2676120891Sume /* enough room, pad or truncate */ 2677120891Sume size_t extra; 267853541Sshin 2679120891Sume extra = m0->m_pkthdr.len % 8; 2680120891Sume if (extra) { 2681120891Sume /* pad if easy enough, truncate if not */ 2682120891Sume if (8 - extra <= M_TRAILINGSPACE(m0)) { 2683120891Sume /* pad */ 2684120891Sume m0->m_len += (8 - extra); 2685120891Sume m0->m_pkthdr.len += (8 - extra); 2686120891Sume } else { 2687120891Sume /* truncate */ 2688120891Sume m0->m_pkthdr.len -= extra; 2689120891Sume m0->m_len -= extra; 2690120891Sume } 269153541Sshin } 2692120891Sume len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2693120891Sume m0->m_pkthdr.len = m0->m_len = len - 2694120891Sume sizeof(*nd_opt_rh); 269553541Sshin } 269653541Sshin 2697120891Sume nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2698120891Sume bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2699120891Sume nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2700120891Sume nd_opt_rh->nd_opt_rh_len = len >> 3; 2701120891Sume p += sizeof(*nd_opt_rh); 2702120891Sume m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 270353541Sshin 2704120891Sume /* connect m0 to m */ 2705120891Sume m_tag_delete_chain(m0, NULL); 2706120891Sume m0->m_flags &= ~M_PKTHDR; 2707120891Sume m->m_next = m0; 2708120891Sume m->m_pkthdr.len = m->m_len + m0->m_len; 2709120891Sume m0 = NULL; 2710120891Sume } 271153541Sshinnoredhdropt:; 2712112781Ssuz if (m0) { 2713112781Ssuz m_freem(m0); 2714112781Ssuz m0 = NULL; 2715112781Ssuz } 271653541Sshin 2717121315Sume /* XXX: clear embedded link IDs in the inner header */ 2718121315Sume in6_clearscope(&sip6->ip6_src); 2719121315Sume in6_clearscope(&sip6->ip6_dst); 2720121315Sume in6_clearscope(&nd_rd->nd_rd_target); 2721121315Sume in6_clearscope(&nd_rd->nd_rd_dst); 272253541Sshin 272353541Sshin ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 272453541Sshin 272553541Sshin nd_rd->nd_rd_cksum = 0; 2726120891Sume nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2727120891Sume sizeof(*ip6), ntohs(ip6->ip6_plen)); 272853541Sshin 272953541Sshin /* send the packet to outside... */ 2730105194Ssam ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 273153541Sshin if (outif) { 273253541Sshin icmp6_ifstat_inc(outif, ifs6_out_msg); 273353541Sshin icmp6_ifstat_inc(outif, ifs6_out_redirect); 273453541Sshin } 2735190964Srwatson ICMP6STAT_INC(icp6s_outhist[ND_REDIRECT]); 273653541Sshin 273753541Sshin return; 273853541Sshin 273953541Sshinfail: 274053541Sshin if (m) 274153541Sshin m_freem(m); 274253541Sshin if (m0) 274353541Sshin m_freem(m0); 274453541Sshin} 274553541Sshin 274653541Sshin/* 274753541Sshin * ICMPv6 socket option processing. 274853541Sshin */ 274953541Sshinint 2750171259Sdelphijicmp6_ctloutput(struct socket *so, struct sockopt *sopt) 275153541Sshin{ 275253541Sshin int error = 0; 275353541Sshin int optlen; 275478064Sume struct inpcb *inp = sotoinpcb(so); 275553541Sshin int level, op, optname; 275653541Sshin 275753541Sshin if (sopt) { 275853541Sshin level = sopt->sopt_level; 275953541Sshin op = sopt->sopt_dir; 276053541Sshin optname = sopt->sopt_name; 276153541Sshin optlen = sopt->sopt_valsize; 276253541Sshin } else 276353541Sshin level = op = optname = optlen = 0; 276478064Sume 276553541Sshin if (level != IPPROTO_ICMPV6) { 276653541Sshin return EINVAL; 276753541Sshin } 276853541Sshin 276978064Sume switch (op) { 277053541Sshin case PRCO_SETOPT: 277153541Sshin switch (optname) { 277253541Sshin case ICMP6_FILTER: 277353541Sshin { 2774180968Srwatson struct icmp6_filter ic6f; 277553541Sshin 2776180968Srwatson if (optlen != sizeof(ic6f)) { 277753541Sshin error = EMSGSIZE; 277853541Sshin break; 277953541Sshin } 2780180968Srwatson error = sooptcopyin(sopt, &ic6f, optlen, optlen); 2781180968Srwatson if (error == 0) { 2782180968Srwatson INP_WLOCK(inp); 2783180968Srwatson *inp->in6p_icmp6filt = ic6f; 2784180968Srwatson INP_WUNLOCK(inp); 2785180968Srwatson } 278653541Sshin break; 278753541Sshin } 278853541Sshin 278953541Sshin default: 279053541Sshin error = ENOPROTOOPT; 279153541Sshin break; 279253541Sshin } 279353541Sshin break; 279453541Sshin 279553541Sshin case PRCO_GETOPT: 279653541Sshin switch (optname) { 279753541Sshin case ICMP6_FILTER: 279853541Sshin { 2799180968Srwatson struct icmp6_filter ic6f; 2800180968Srwatson 2801180968Srwatson INP_RLOCK(inp); 2802180968Srwatson ic6f = *inp->in6p_icmp6filt; 2803180968Srwatson INP_RUNLOCK(inp); 2804180968Srwatson error = sooptcopyout(sopt, &ic6f, sizeof(ic6f)); 280553541Sshin break; 280653541Sshin } 280753541Sshin 280853541Sshin default: 280953541Sshin error = ENOPROTOOPT; 281053541Sshin break; 281153541Sshin } 281253541Sshin break; 281353541Sshin } 281453541Sshin 2815120856Sume return (error); 281653541Sshin} 281753541Sshin 281853541Sshin/* 281953541Sshin * Perform rate limit check. 282053541Sshin * Returns 0 if it is okay to send the icmp6 packet. 282153541Sshin * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 282253541Sshin * limitation. 282353541Sshin * 282453541Sshin * XXX per-destination/type check necessary? 2825171259Sdelphij * 2826171259Sdelphij * dst - not used at this moment 2827171259Sdelphij * type - not used at this moment 2828171259Sdelphij * code - not used at this moment 282953541Sshin */ 283053541Sshinstatic int 2831171259Sdelphijicmp6_ratelimit(const struct in6_addr *dst, const int type, 2832171259Sdelphij const int code) 283353541Sshin{ 283462587Sitojun int ret; 283553541Sshin 283695023Ssuz ret = 0; /* okay to send */ 283753541Sshin 283862587Sitojun /* PPS limit */ 2839181803Sbz if (!ppsratecheck(&V_icmp6errppslim_last, &V_icmp6errpps_count, 2840181803Sbz V_icmp6errppslim)) { 284153541Sshin /* The packet is subject to rate limit */ 284262587Sitojun ret++; 284353541Sshin } 284453541Sshin 284562587Sitojun return ret; 284653541Sshin} 2847