icmp6.c revision 112781
162587Sitojun/* $FreeBSD: head/sys/netinet6/icmp6.c 112781 2003-03-29 08:31:28Z suz $ */ 278064Sume/* $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $ */ 362587Sitojun 453541Sshin/* 553541Sshin * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 653541Sshin * All rights reserved. 753541Sshin * 853541Sshin * Redistribution and use in source and binary forms, with or without 953541Sshin * modification, are permitted provided that the following conditions 1053541Sshin * are met: 1153541Sshin * 1. Redistributions of source code must retain the above copyright 1253541Sshin * notice, this list of conditions and the following disclaimer. 1353541Sshin * 2. Redistributions in binary form must reproduce the above copyright 1453541Sshin * notice, this list of conditions and the following disclaimer in the 1553541Sshin * documentation and/or other materials provided with the distribution. 1653541Sshin * 3. Neither the name of the project nor the names of its contributors 1753541Sshin * may be used to endorse or promote products derived from this software 1853541Sshin * without specific prior written permission. 1953541Sshin * 2053541Sshin * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 2153541Sshin * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2253541Sshin * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2353541Sshin * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2453541Sshin * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2553541Sshin * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2653541Sshin * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2753541Sshin * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2853541Sshin * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2953541Sshin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3053541Sshin * SUCH DAMAGE. 3153541Sshin */ 3253541Sshin 3353541Sshin/* 3453541Sshin * Copyright (c) 1982, 1986, 1988, 1993 3553541Sshin * The Regents of the University of California. All rights reserved. 3653541Sshin * 3753541Sshin * Redistribution and use in source and binary forms, with or without 3853541Sshin * modification, are permitted provided that the following conditions 3953541Sshin * are met: 4053541Sshin * 1. Redistributions of source code must retain the above copyright 4153541Sshin * notice, this list of conditions and the following disclaimer. 4253541Sshin * 2. Redistributions in binary form must reproduce the above copyright 4353541Sshin * notice, this list of conditions and the following disclaimer in the 4453541Sshin * documentation and/or other materials provided with the distribution. 4553541Sshin * 3. All advertising materials mentioning features or use of this software 4653541Sshin * must display the following acknowledgement: 4753541Sshin * This product includes software developed by the University of 4853541Sshin * California, Berkeley and its contributors. 4953541Sshin * 4. Neither the name of the University nor the names of its contributors 5053541Sshin * may be used to endorse or promote products derived from this software 5153541Sshin * without specific prior written permission. 5253541Sshin * 5353541Sshin * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 5453541Sshin * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 5553541Sshin * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 5653541Sshin * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 5753541Sshin * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 5853541Sshin * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 5953541Sshin * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 6053541Sshin * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 6153541Sshin * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 6253541Sshin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 6353541Sshin * SUCH DAMAGE. 6453541Sshin * 6553541Sshin * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 6653541Sshin */ 6753541Sshin 6862587Sitojun#include "opt_inet.h" 6962587Sitojun#include "opt_inet6.h" 7055009Sshin#include "opt_ipsec.h" 7153541Sshin 7253541Sshin#include <sys/param.h> 7395759Stanimura#include <sys/domain.h> 7495759Stanimura#include <sys/kernel.h> 7595759Stanimura#include <sys/lock.h> 7678064Sume#include <sys/malloc.h> 7753541Sshin#include <sys/mbuf.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> 8953541Sshin#include <net/if_types.h> 9095759Stanimura#include <net/route.h> 9153541Sshin 9253541Sshin#include <netinet/in.h> 9395759Stanimura#include <netinet/in_pcb.h> 9453541Sshin#include <netinet/in_var.h> 9562587Sitojun#include <netinet/ip6.h> 9695759Stanimura#include <netinet/icmp6.h> 9795759Stanimura#include <netinet6/in6_ifattach.h> 9895759Stanimura#include <netinet6/in6_pcb.h> 9995759Stanimura#include <netinet6/ip6protosw.h> 10053541Sshin#include <netinet6/ip6_var.h> 10153541Sshin#include <netinet6/mld6_var.h> 10253541Sshin#include <netinet6/nd6.h> 10353541Sshin 10453541Sshin#ifdef IPSEC 10553541Sshin#include <netinet6/ipsec.h> 10653541Sshin#include <netkey/key.h> 10755009Sshin#endif 10853541Sshin 109105199Ssam#ifdef FAST_IPSEC 110105199Ssam#include <netipsec/ipsec.h> 111105199Ssam#include <netipsec/key.h> 112105199Ssam#define IPSEC 113105199Ssam#endif 114105199Ssam 11553541Sshin#include <net/net_osdep.h> 11653541Sshin 11778064Sume#ifdef HAVE_NRL_INPCB 11878064Sume/* inpcb members */ 11978064Sume#define in6pcb inpcb 12078064Sume#define in6p_laddr inp_laddr6 12178064Sume#define in6p_faddr inp_faddr6 12278064Sume#define in6p_icmp6filt inp_icmp6filt 12378064Sume#define in6p_route inp_route 12478064Sume#define in6p_socket inp_socket 12578064Sume#define in6p_flags inp_flags 12678064Sume#define in6p_moptions inp_moptions6 12778064Sume#define in6p_outputopts inp_outputopts6 12878064Sume#define in6p_ip6 inp_ipv6 12978064Sume#define in6p_flowinfo inp_flowinfo 13078064Sume#define in6p_sp inp_sp 13178064Sume#define in6p_next inp_next 13278064Sume#define in6p_prev inp_prev 13378064Sume/* macro names */ 13478064Sume#define sotoin6pcb sotoinpcb 13578064Sume/* function names */ 13678064Sume#define in6_pcbdetach in_pcbdetach 13778064Sume#define in6_rtchange in_rtchange 13878064Sume 13978064Sume/* 14078064Sume * for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from 14178064Sume * others... 14278064Sume */ 14378064Sume#define in6p_ip6_nxt inp_ipv6.ip6_nxt 14478064Sume#endif 14578064Sume 14662587Sitojunextern struct domain inet6domain; 14753541Sshin 14862587Sitojunstruct icmp6stat icmp6stat; 14953541Sshin 15062587Sitojunextern struct inpcbhead ripcb; 15162587Sitojunextern int icmp6errppslim; 15262587Sitojunstatic int icmp6errpps_count = 0; 15378064Sumestatic struct timeval icmp6errppslim_last; 15462587Sitojunextern int icmp6_nodeinfo; 15553541Sshin 15662587Sitojunstatic void icmp6_errcount __P((struct icmp6errstat *, int, int)); 15762587Sitojunstatic int icmp6_rip6_input __P((struct mbuf **, int)); 15862587Sitojunstatic int icmp6_ratelimit __P((const struct in6_addr *, const int, const int)); 15962587Sitojunstatic const char *icmp6_redirect_diag __P((struct in6_addr *, 16062587Sitojun struct in6_addr *, struct in6_addr *)); 161108143Ssam#define HAVE_PPSRATECHECK 16278064Sume#ifndef HAVE_PPSRATECHECK 16378064Sumestatic int ppsratecheck __P((struct timeval *, int *, int)); 16462587Sitojun#endif 16562587Sitojunstatic struct mbuf *ni6_input __P((struct mbuf *, int)); 16662587Sitojunstatic struct mbuf *ni6_nametodns __P((const char *, int, int)); 16762587Sitojunstatic int ni6_dnsmatch __P((const char *, int, const char *, int)); 16862587Sitojunstatic int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *, 16978064Sume struct ifnet **, char *)); 17062587Sitojunstatic int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 17162587Sitojun struct ifnet *, int)); 17278064Sumestatic int icmp6_notify_error __P((struct mbuf *, int, int, int)); 17353541Sshin 17453541Sshin#ifdef COMPAT_RFC1885 17562587Sitojunstatic struct route_in6 icmp6_reflect_rt; 17653541Sshin#endif 17753541Sshin 17878064Sume 17953541Sshinvoid 18053541Sshinicmp6_init() 18153541Sshin{ 18253541Sshin mld6_init(); 18353541Sshin} 18453541Sshin 18562587Sitojunstatic void 18662587Sitojunicmp6_errcount(stat, type, code) 18762587Sitojun struct icmp6errstat *stat; 18862587Sitojun int type, code; 18962587Sitojun{ 19078064Sume switch (type) { 19162587Sitojun case ICMP6_DST_UNREACH: 19262587Sitojun switch (code) { 19362587Sitojun case ICMP6_DST_UNREACH_NOROUTE: 19462587Sitojun stat->icp6errs_dst_unreach_noroute++; 19562587Sitojun return; 19662587Sitojun case ICMP6_DST_UNREACH_ADMIN: 19762587Sitojun stat->icp6errs_dst_unreach_admin++; 19862587Sitojun return; 19962587Sitojun case ICMP6_DST_UNREACH_BEYONDSCOPE: 20062587Sitojun stat->icp6errs_dst_unreach_beyondscope++; 20162587Sitojun return; 20262587Sitojun case ICMP6_DST_UNREACH_ADDR: 20362587Sitojun stat->icp6errs_dst_unreach_addr++; 20462587Sitojun return; 20562587Sitojun case ICMP6_DST_UNREACH_NOPORT: 20662587Sitojun stat->icp6errs_dst_unreach_noport++; 20762587Sitojun return; 20862587Sitojun } 20962587Sitojun break; 21062587Sitojun case ICMP6_PACKET_TOO_BIG: 21162587Sitojun stat->icp6errs_packet_too_big++; 21262587Sitojun return; 21362587Sitojun case ICMP6_TIME_EXCEEDED: 21478064Sume switch (code) { 21562587Sitojun case ICMP6_TIME_EXCEED_TRANSIT: 21662587Sitojun stat->icp6errs_time_exceed_transit++; 21762587Sitojun return; 21862587Sitojun case ICMP6_TIME_EXCEED_REASSEMBLY: 21962587Sitojun stat->icp6errs_time_exceed_reassembly++; 22062587Sitojun return; 22162587Sitojun } 22262587Sitojun break; 22362587Sitojun case ICMP6_PARAM_PROB: 22478064Sume switch (code) { 22562587Sitojun case ICMP6_PARAMPROB_HEADER: 22662587Sitojun stat->icp6errs_paramprob_header++; 22762587Sitojun return; 22862587Sitojun case ICMP6_PARAMPROB_NEXTHEADER: 22962587Sitojun stat->icp6errs_paramprob_nextheader++; 23062587Sitojun return; 23162587Sitojun case ICMP6_PARAMPROB_OPTION: 23262587Sitojun stat->icp6errs_paramprob_option++; 23362587Sitojun return; 23462587Sitojun } 23562587Sitojun break; 23662587Sitojun case ND_REDIRECT: 23762587Sitojun stat->icp6errs_redirect++; 23862587Sitojun return; 23962587Sitojun } 24062587Sitojun stat->icp6errs_unknown++; 24162587Sitojun} 24262587Sitojun 24353541Sshin/* 24453541Sshin * Generate an error packet of type error in response to bad IP6 packet. 24553541Sshin */ 24653541Sshinvoid 24753541Sshinicmp6_error(m, type, code, param) 24853541Sshin struct mbuf *m; 24953541Sshin int type, code, param; 25053541Sshin{ 25153541Sshin struct ip6_hdr *oip6, *nip6; 25253541Sshin struct icmp6_hdr *icmp6; 25362587Sitojun u_int preplen; 25453541Sshin int off; 25562587Sitojun int nxt; 25653541Sshin 25753541Sshin icmp6stat.icp6s_error++; 25853541Sshin 25962587Sitojun /* count per-type-code statistics */ 26062587Sitojun icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code); 26162587Sitojun 26262587Sitojun#ifdef M_DECRYPTED /*not openbsd*/ 26362587Sitojun if (m->m_flags & M_DECRYPTED) { 26462587Sitojun icmp6stat.icp6s_canterror++; 26553541Sshin goto freeit; 26662587Sitojun } 26762587Sitojun#endif 26853541Sshin 26962587Sitojun#ifndef PULLDOWN_TEST 27062587Sitojun IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 27162587Sitojun#else 27262587Sitojun if (m->m_len < sizeof(struct ip6_hdr)) { 27362587Sitojun m = m_pullup(m, sizeof(struct ip6_hdr)); 27462587Sitojun if (m == NULL) 27562587Sitojun return; 27662587Sitojun } 27762587Sitojun#endif 27853541Sshin oip6 = mtod(m, struct ip6_hdr *); 27953541Sshin 28053541Sshin /* 28153541Sshin * Multicast destination check. For unrecognized option errors, 28253541Sshin * this check has already done in ip6_unknown_opt(), so we can 28353541Sshin * check only for other errors. 28453541Sshin */ 28553541Sshin if ((m->m_flags & (M_BCAST|M_MCAST) || 28653541Sshin IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 28753541Sshin (type != ICMP6_PACKET_TOO_BIG && 28853541Sshin (type != ICMP6_PARAM_PROB || 28953541Sshin code != ICMP6_PARAMPROB_OPTION))) 29053541Sshin goto freeit; 29153541Sshin 29253541Sshin /* Source address check. XXX: the case of anycast source? */ 29353541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 29453541Sshin IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 29553541Sshin goto freeit; 29653541Sshin 29753541Sshin /* 29862587Sitojun * If we are about to send ICMPv6 against ICMPv6 error/redirect, 29962587Sitojun * don't do it. 30053541Sshin */ 30162587Sitojun nxt = -1; 30262587Sitojun off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 30362587Sitojun if (off >= 0 && nxt == IPPROTO_ICMPV6) { 30453541Sshin struct icmp6_hdr *icp; 30553541Sshin 30662587Sitojun#ifndef PULLDOWN_TEST 30762587Sitojun IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), ); 30862587Sitojun icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 30962587Sitojun#else 31062587Sitojun IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 31162587Sitojun sizeof(*icp)); 31262587Sitojun if (icp == NULL) { 31362587Sitojun icmp6stat.icp6s_tooshort++; 31462587Sitojun return; 31562587Sitojun } 31662587Sitojun#endif 31762587Sitojun if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 31862587Sitojun icp->icmp6_type == ND_REDIRECT) { 31953541Sshin /* 32062587Sitojun * ICMPv6 error 32162587Sitojun * Special case: for redirect (which is 32262587Sitojun * informational) we must not send icmp6 error. 32353541Sshin */ 32462587Sitojun icmp6stat.icp6s_canterror++; 32562587Sitojun goto freeit; 32662587Sitojun } else { 32762587Sitojun /* ICMPv6 informational - send the error */ 32853541Sshin } 32962587Sitojun } else { 33062587Sitojun /* non-ICMPv6 - send the error */ 33153541Sshin } 33253541Sshin 33353541Sshin oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 33453541Sshin 33553541Sshin /* Finally, do rate limitation check. */ 33653541Sshin if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 33753541Sshin icmp6stat.icp6s_toofreq++; 33853541Sshin goto freeit; 33953541Sshin } 34053541Sshin 34153541Sshin /* 34253541Sshin * OK, ICMP6 can be generated. 34353541Sshin */ 34453541Sshin 34553541Sshin if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 34653541Sshin m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 34753541Sshin 34862587Sitojun preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 349111119Simp M_PREPEND(m, preplen, M_DONTWAIT); 35062587Sitojun if (m && m->m_len < preplen) 35162587Sitojun m = m_pullup(m, preplen); 35253541Sshin if (m == NULL) { 35378064Sume nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__)); 35453541Sshin return; 35553541Sshin } 35653541Sshin 35753541Sshin nip6 = mtod(m, struct ip6_hdr *); 35853541Sshin nip6->ip6_src = oip6->ip6_src; 35953541Sshin nip6->ip6_dst = oip6->ip6_dst; 36053541Sshin 36153541Sshin if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 36253541Sshin oip6->ip6_src.s6_addr16[1] = 0; 36353541Sshin if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 36453541Sshin oip6->ip6_dst.s6_addr16[1] = 0; 36553541Sshin 36653541Sshin icmp6 = (struct icmp6_hdr *)(nip6 + 1); 36753541Sshin icmp6->icmp6_type = type; 36853541Sshin icmp6->icmp6_code = code; 36953541Sshin icmp6->icmp6_pptr = htonl((u_int32_t)param); 37053541Sshin 37178064Sume /* 37278064Sume * icmp6_reflect() is designed to be in the input path. 37378064Sume * icmp6_error() can be called from both input and outut path, 37478064Sume * and if we are in output path rcvif could contain bogus value. 37578064Sume * clear m->m_pkthdr.rcvif for safety, we should have enough scope 37678064Sume * information in ip header (nip6). 37778064Sume */ 37878064Sume m->m_pkthdr.rcvif = NULL; 37978064Sume 38053541Sshin icmp6stat.icp6s_outhist[type]++; 38195023Ssuz icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 38262587Sitojun 38362587Sitojun return; 38462587Sitojun 38562587Sitojun freeit: 38662587Sitojun /* 38762587Sitojun * If we can't tell wheter or not we can generate ICMP6, free it. 38862587Sitojun */ 38962587Sitojun m_freem(m); 39053541Sshin} 39153541Sshin 39253541Sshin/* 39353541Sshin * Process a received ICMP6 message. 39453541Sshin */ 39553541Sshinint 39653541Sshinicmp6_input(mp, offp, proto) 39753541Sshin struct mbuf **mp; 39853541Sshin int *offp, proto; 39953541Sshin{ 40053541Sshin struct mbuf *m = *mp, *n; 40153541Sshin struct ip6_hdr *ip6, *nip6; 40253541Sshin struct icmp6_hdr *icmp6, *nicmp6; 40353541Sshin int off = *offp; 40453541Sshin int icmp6len = m->m_pkthdr.len - *offp; 40553541Sshin int code, sum, noff; 40653541Sshin 40762587Sitojun#ifndef PULLDOWN_TEST 40853541Sshin IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE); 40995023Ssuz /* m might change if M_LOOP. So, call mtod after this */ 41062587Sitojun#endif 41153541Sshin 41253541Sshin /* 41353541Sshin * Locate icmp6 structure in mbuf, and check 41453541Sshin * that not corrupted and of at least minimum length 41553541Sshin */ 41653541Sshin 41753541Sshin ip6 = mtod(m, struct ip6_hdr *); 41853541Sshin if (icmp6len < sizeof(struct icmp6_hdr)) { 41953541Sshin icmp6stat.icp6s_tooshort++; 42053541Sshin goto freeit; 42153541Sshin } 42253541Sshin 42353541Sshin /* 42453541Sshin * calculate the checksum 42553541Sshin */ 42662587Sitojun#ifndef PULLDOWN_TEST 42753541Sshin icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 42862587Sitojun#else 42962587Sitojun IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 43062587Sitojun if (icmp6 == NULL) { 43162587Sitojun icmp6stat.icp6s_tooshort++; 43262587Sitojun return IPPROTO_DONE; 43362587Sitojun } 43462587Sitojun#endif 43553541Sshin code = icmp6->icmp6_code; 43653541Sshin 43753541Sshin if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 43878064Sume nd6log((LOG_ERR, 43953541Sshin "ICMP6 checksum error(%d|%x) %s\n", 44078064Sume icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src))); 44153541Sshin icmp6stat.icp6s_checksum++; 44253541Sshin goto freeit; 44353541Sshin } 44453541Sshin 44583934Sbrooks if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 44653541Sshin /* 44753541Sshin * Deliver very specific ICMP6 type only. 44853541Sshin * This is important to deilver TOOBIG. Otherwise PMTUD 44953541Sshin * will not work. 45053541Sshin */ 45153541Sshin switch (icmp6->icmp6_type) { 45253541Sshin case ICMP6_DST_UNREACH: 45353541Sshin case ICMP6_PACKET_TOO_BIG: 45453541Sshin case ICMP6_TIME_EXCEEDED: 45553541Sshin break; 45653541Sshin default: 45753541Sshin goto freeit; 45853541Sshin } 45953541Sshin } 46053541Sshin 46153541Sshin icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; 46253541Sshin icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); 46353541Sshin if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 46453541Sshin icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 46553541Sshin 46653541Sshin switch (icmp6->icmp6_type) { 46753541Sshin case ICMP6_DST_UNREACH: 46853541Sshin icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach); 46953541Sshin switch (code) { 47053541Sshin case ICMP6_DST_UNREACH_NOROUTE: 47153541Sshin code = PRC_UNREACH_NET; 47253541Sshin break; 47353541Sshin case ICMP6_DST_UNREACH_ADMIN: 47453541Sshin icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib); 47562587Sitojun code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 47662587Sitojun break; 47753541Sshin case ICMP6_DST_UNREACH_ADDR: 47862587Sitojun code = PRC_HOSTDEAD; 47953541Sshin break; 48062587Sitojun#ifdef COMPAT_RFC1885 48153541Sshin case ICMP6_DST_UNREACH_NOTNEIGHBOR: 48253541Sshin code = PRC_UNREACH_SRCFAIL; 48353541Sshin break; 48462587Sitojun#else 48562587Sitojun case ICMP6_DST_UNREACH_BEYONDSCOPE: 48662587Sitojun /* I mean "source address was incorrect." */ 48762587Sitojun code = PRC_PARAMPROB; 48862587Sitojun break; 48962587Sitojun#endif 49053541Sshin case ICMP6_DST_UNREACH_NOPORT: 49153541Sshin code = PRC_UNREACH_PORT; 49253541Sshin break; 49353541Sshin default: 49453541Sshin goto badcode; 49553541Sshin } 49653541Sshin goto deliver; 49753541Sshin break; 49853541Sshin 49953541Sshin case ICMP6_PACKET_TOO_BIG: 50053541Sshin icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig); 50153541Sshin if (code != 0) 50253541Sshin goto badcode; 50353541Sshin 50453541Sshin code = PRC_MSGSIZE; 50553541Sshin 50662587Sitojun /* 50762587Sitojun * Updating the path MTU will be done after examining 50862587Sitojun * intermediate extension headers. 50962587Sitojun */ 51053541Sshin goto deliver; 51153541Sshin break; 51253541Sshin 51353541Sshin case ICMP6_TIME_EXCEEDED: 51453541Sshin icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); 51553541Sshin switch (code) { 51653541Sshin case ICMP6_TIME_EXCEED_TRANSIT: 51753541Sshin case ICMP6_TIME_EXCEED_REASSEMBLY: 51853541Sshin code += PRC_TIMXCEED_INTRANS; 51953541Sshin break; 52053541Sshin default: 52153541Sshin goto badcode; 52253541Sshin } 52353541Sshin goto deliver; 52453541Sshin break; 52553541Sshin 52653541Sshin case ICMP6_PARAM_PROB: 52753541Sshin icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); 52853541Sshin switch (code) { 52953541Sshin case ICMP6_PARAMPROB_NEXTHEADER: 53053541Sshin code = PRC_UNREACH_PROTOCOL; 53153541Sshin break; 53253541Sshin case ICMP6_PARAMPROB_HEADER: 53353541Sshin case ICMP6_PARAMPROB_OPTION: 53453541Sshin code = PRC_PARAMPROB; 53553541Sshin break; 53653541Sshin default: 53753541Sshin goto badcode; 53853541Sshin } 53953541Sshin goto deliver; 54053541Sshin break; 54153541Sshin 54253541Sshin case ICMP6_ECHO_REQUEST: 54353541Sshin icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); 54453541Sshin if (code != 0) 54553541Sshin goto badcode; 54653541Sshin if ((n = m_copy(m, 0, M_COPYALL)) == NULL) { 54753541Sshin /* Give up remote */ 54853541Sshin break; 54953541Sshin } 55062587Sitojun if ((n->m_flags & M_EXT) != 0 55162587Sitojun || n->m_len < off + sizeof(struct icmp6_hdr)) { 55253541Sshin struct mbuf *n0 = n; 55362587Sitojun const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 554108741Ssam int n0len; 55553541Sshin 55653541Sshin /* 55753541Sshin * Prepare an internal mbuf. m_pullup() doesn't 55853541Sshin * always copy the length we specified. 55953541Sshin */ 56062587Sitojun if (maxlen >= MCLBYTES) { 56162587Sitojun /* Give up remote */ 56262587Sitojun m_freem(n0); 56362587Sitojun break; 56462587Sitojun } 565111119Simp MGETHDR(n, M_DONTWAIT, n0->m_type); 566111070Ssam n0len = n0->m_pkthdr.len; /* save for use below */ 567111070Ssam if (n) 568111070Ssam M_MOVE_PKTHDR(n, n0); 56962587Sitojun if (n && maxlen >= MHLEN) { 570111119Simp MCLGET(n, M_DONTWAIT); 57162587Sitojun if ((n->m_flags & M_EXT) == 0) { 57262587Sitojun m_free(n); 57362587Sitojun n = NULL; 57462587Sitojun } 57562587Sitojun } 57653541Sshin if (n == NULL) { 57753541Sshin /* Give up remote */ 57853541Sshin m_freem(n0); 57953541Sshin break; 58053541Sshin } 58153541Sshin /* 58253541Sshin * Copy IPv6 and ICMPv6 only. 58353541Sshin */ 58453541Sshin nip6 = mtod(n, struct ip6_hdr *); 58553541Sshin bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 58653541Sshin nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 58753541Sshin bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 58862587Sitojun noff = sizeof(struct ip6_hdr); 589108741Ssam /* new mbuf contains only ipv6+icmpv6 headers */ 590108741Ssam n->m_len = noff + sizeof(struct icmp6_hdr); 59153541Sshin /* 59262587Sitojun * Adjust mbuf. ip6_plen will be adjusted in 59362587Sitojun * ip6_output(). 59453541Sshin */ 59562587Sitojun m_adj(n0, off + sizeof(struct icmp6_hdr)); 596108741Ssam /* recalculate complete packet size */ 597108741Ssam n->m_pkthdr.len = n0len + (noff - off); 59862587Sitojun n->m_next = n0; 59953541Sshin } else { 60053541Sshin nip6 = mtod(n, struct ip6_hdr *); 60153541Sshin nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off); 60253541Sshin noff = off; 60353541Sshin } 60453541Sshin nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 60553541Sshin nicmp6->icmp6_code = 0; 60653541Sshin if (n) { 60753541Sshin icmp6stat.icp6s_reflect++; 60853541Sshin icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 60953541Sshin icmp6_reflect(n, noff); 61053541Sshin } 61153541Sshin break; 61253541Sshin 61353541Sshin case ICMP6_ECHO_REPLY: 61453541Sshin icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 61553541Sshin if (code != 0) 61653541Sshin goto badcode; 61753541Sshin break; 61853541Sshin 61996116Sume case MLD_LISTENER_QUERY: 62096116Sume case MLD_LISTENER_REPORT: 62196116Sume if (icmp6len < sizeof(struct mld_hdr)) 62253541Sshin goto badlen; 62396116Sume if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 62453541Sshin icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 62553541Sshin else 62653541Sshin icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 627111119Simp if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 62862587Sitojun /* give up local */ 62962587Sitojun mld6_input(m, off); 63062587Sitojun m = NULL; 63162587Sitojun goto freeit; 63262587Sitojun } 63362587Sitojun mld6_input(n, off); 63453541Sshin /* m stays. */ 63553541Sshin break; 63653541Sshin 63796116Sume case MLD_LISTENER_DONE: 63853541Sshin icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 63996116Sume if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 64053541Sshin goto badlen; 64153541Sshin break; /* nothing to be done in kernel */ 64253541Sshin 64396116Sume case MLD_MTRACE_RESP: 64496116Sume case MLD_MTRACE: 64595023Ssuz /* XXX: these two are experimental. not officially defind. */ 64653541Sshin /* XXX: per-interface statistics? */ 64762587Sitojun break; /* just pass it to applications */ 64853541Sshin 64953541Sshin case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 65053541Sshin { 65153541Sshin enum { WRU, FQDN } mode; 65253541Sshin 65362587Sitojun if (!icmp6_nodeinfo) 65462587Sitojun break; 65562587Sitojun 65653541Sshin if (icmp6len == sizeof(struct icmp6_hdr) + 4) 65753541Sshin mode = WRU; 65862587Sitojun else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 65953541Sshin mode = FQDN; 66053541Sshin else 66153541Sshin goto badlen; 66253541Sshin 66353541Sshin#define hostnamelen strlen(hostname) 66453541Sshin if (mode == FQDN) { 66562587Sitojun#ifndef PULLDOWN_TEST 66653541Sshin IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), 66753541Sshin IPPROTO_DONE); 66862587Sitojun#endif 66962587Sitojun n = m_copy(m, 0, M_COPYALL); 67062587Sitojun if (n) 67162587Sitojun n = ni6_input(n, off); 67262587Sitojun /* XXX meaningless if n == NULL */ 67353541Sshin noff = sizeof(struct ip6_hdr); 67453541Sshin } else { 67553541Sshin u_char *p; 67662587Sitojun int maxlen, maxhlen; 67753541Sshin 67878064Sume if ((icmp6_nodeinfo & 5) != 5) 67978064Sume break; 68078064Sume 68162587Sitojun if (code != 0) 68262587Sitojun goto badcode; 68362587Sitojun maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 68462587Sitojun if (maxlen >= MCLBYTES) { 68562587Sitojun /* Give up remote */ 68662587Sitojun break; 68762587Sitojun } 688111119Simp MGETHDR(n, M_DONTWAIT, m->m_type); 68962587Sitojun if (n && maxlen > MHLEN) { 690111119Simp MCLGET(n, M_DONTWAIT); 69162587Sitojun if ((n->m_flags & M_EXT) == 0) { 69262587Sitojun m_free(n); 69362587Sitojun n = NULL; 69462587Sitojun } 69562587Sitojun } 696111119Simp if (!m_dup_pkthdr(n, m, M_DONTWAIT)) { 697108466Ssam /* 698108466Ssam * Previous code did a blind M_COPY_PKTHDR 699108466Ssam * and said "just for rcvif". If true, then 700108466Ssam * we could tolerate the dup failing (due to 701108466Ssam * the deep copy of the tag chain). For now 702108466Ssam * be conservative and just fail. 703108466Ssam */ 704108466Ssam m_free(n); 705108466Ssam n = NULL; 706108466Ssam } 70753541Sshin if (n == NULL) { 70853541Sshin /* Give up remote */ 70953541Sshin break; 71053541Sshin } 71178064Sume n->m_pkthdr.rcvif = NULL; 71262587Sitojun n->m_len = 0; 71362587Sitojun maxhlen = M_TRAILINGSPACE(n) - maxlen; 71462587Sitojun if (maxhlen > hostnamelen) 71562587Sitojun maxhlen = hostnamelen; 71653541Sshin /* 71753541Sshin * Copy IPv6 and ICMPv6 only. 71853541Sshin */ 71953541Sshin nip6 = mtod(n, struct ip6_hdr *); 72053541Sshin bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 72153541Sshin nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 72253541Sshin bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 72353541Sshin p = (u_char *)(nicmp6 + 1); 72453541Sshin bzero(p, 4); 72595023Ssuz bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ 72653541Sshin noff = sizeof(struct ip6_hdr); 72753541Sshin n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 72862587Sitojun sizeof(struct icmp6_hdr) + 4 + maxhlen; 72953541Sshin nicmp6->icmp6_type = ICMP6_WRUREPLY; 73053541Sshin nicmp6->icmp6_code = 0; 73153541Sshin } 73253541Sshin#undef hostnamelen 73353541Sshin if (n) { 73453541Sshin icmp6stat.icp6s_reflect++; 73553541Sshin icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 73653541Sshin icmp6_reflect(n, noff); 73753541Sshin } 73853541Sshin break; 73953541Sshin } 74053541Sshin 74153541Sshin case ICMP6_WRUREPLY: 74253541Sshin if (code != 0) 74353541Sshin goto badcode; 74453541Sshin break; 74553541Sshin 74653541Sshin case ND_ROUTER_SOLICIT: 74753541Sshin icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 74853541Sshin if (code != 0) 74953541Sshin goto badcode; 75053541Sshin if (icmp6len < sizeof(struct nd_router_solicit)) 75153541Sshin goto badlen; 752111119Simp if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 75362587Sitojun /* give up local */ 75462587Sitojun nd6_rs_input(m, off, icmp6len); 75562587Sitojun m = NULL; 75662587Sitojun goto freeit; 75762587Sitojun } 75862587Sitojun nd6_rs_input(n, off, icmp6len); 75953541Sshin /* m stays. */ 76053541Sshin break; 76153541Sshin 76253541Sshin case ND_ROUTER_ADVERT: 76353541Sshin icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 76453541Sshin if (code != 0) 76553541Sshin goto badcode; 76653541Sshin if (icmp6len < sizeof(struct nd_router_advert)) 76753541Sshin goto badlen; 768111119Simp if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 76962587Sitojun /* give up local */ 77062587Sitojun nd6_ra_input(m, off, icmp6len); 77162587Sitojun m = NULL; 77262587Sitojun goto freeit; 77362587Sitojun } 77462587Sitojun nd6_ra_input(n, off, icmp6len); 77553541Sshin /* m stays. */ 77653541Sshin break; 77753541Sshin 77853541Sshin case ND_NEIGHBOR_SOLICIT: 77953541Sshin icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 78053541Sshin if (code != 0) 78153541Sshin goto badcode; 78253541Sshin if (icmp6len < sizeof(struct nd_neighbor_solicit)) 78353541Sshin goto badlen; 784111119Simp if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 78562587Sitojun /* give up local */ 78662587Sitojun nd6_ns_input(m, off, icmp6len); 78762587Sitojun m = NULL; 78862587Sitojun goto freeit; 78962587Sitojun } 79062587Sitojun nd6_ns_input(n, off, icmp6len); 79153541Sshin /* m stays. */ 79253541Sshin break; 79353541Sshin 79453541Sshin case ND_NEIGHBOR_ADVERT: 79553541Sshin icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 79653541Sshin if (code != 0) 79753541Sshin goto badcode; 79853541Sshin if (icmp6len < sizeof(struct nd_neighbor_advert)) 79953541Sshin goto badlen; 800111119Simp if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 80162587Sitojun /* give up local */ 80262587Sitojun nd6_na_input(m, off, icmp6len); 80362587Sitojun m = NULL; 80462587Sitojun goto freeit; 80562587Sitojun } 80662587Sitojun nd6_na_input(n, off, icmp6len); 80753541Sshin /* m stays. */ 80853541Sshin break; 80953541Sshin 81053541Sshin case ND_REDIRECT: 81153541Sshin icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 81253541Sshin if (code != 0) 81353541Sshin goto badcode; 81453541Sshin if (icmp6len < sizeof(struct nd_redirect)) 81553541Sshin goto badlen; 816111119Simp if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 81762587Sitojun /* give up local */ 81862587Sitojun icmp6_redirect_input(m, off); 81962587Sitojun m = NULL; 82062587Sitojun goto freeit; 82162587Sitojun } 82262587Sitojun icmp6_redirect_input(n, off); 82353541Sshin /* m stays. */ 82453541Sshin break; 82553541Sshin 82653541Sshin case ICMP6_ROUTER_RENUMBERING: 82753541Sshin if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 82853541Sshin code != ICMP6_ROUTER_RENUMBERING_RESULT) 82953541Sshin goto badcode; 83053541Sshin if (icmp6len < sizeof(struct icmp6_router_renum)) 83153541Sshin goto badlen; 83253541Sshin break; 83353541Sshin 83453541Sshin default: 83578064Sume nd6log((LOG_DEBUG, 83678064Sume "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 83778064Sume icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 83878064Sume ip6_sprintf(&ip6->ip6_dst), 83978064Sume m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0)); 84053541Sshin if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 84153541Sshin /* ICMPv6 error: MUST deliver it by spec... */ 84253541Sshin code = PRC_NCMDS; 84353541Sshin /* deliver */ 84453541Sshin } else { 84553541Sshin /* ICMPv6 informational: MUST not deliver */ 84653541Sshin break; 84753541Sshin } 84853541Sshin deliver: 84978064Sume if (icmp6_notify_error(m, off, icmp6len, code)) { 85078064Sume /* In this case, m should've been freed. */ 85178064Sume return(IPPROTO_DONE); 85253541Sshin } 85378064Sume break; 85478064Sume 85578064Sume badcode: 85678064Sume icmp6stat.icp6s_badcode++; 85778064Sume break; 85878064Sume 85978064Sume badlen: 86078064Sume icmp6stat.icp6s_badlen++; 86178064Sume break; 86278064Sume } 86378064Sume 86478064Sume /* deliver the packet to appropriate sockets */ 86578064Sume icmp6_rip6_input(&m, *offp); 86678064Sume 86778064Sume return IPPROTO_DONE; 86878064Sume 86978064Sume freeit: 87078064Sume m_freem(m); 87178064Sume return IPPROTO_DONE; 87278064Sume} 87378064Sume 87478064Sumestatic int 87578064Sumeicmp6_notify_error(m, off, icmp6len, code) 87678064Sume struct mbuf *m; 87778064Sume int off, icmp6len; 87878064Sume{ 87978064Sume struct icmp6_hdr *icmp6; 88078064Sume struct ip6_hdr *eip6; 88178064Sume u_int32_t notifymtu; 88278064Sume struct sockaddr_in6 icmp6src, icmp6dst; 88378064Sume 88478064Sume if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 88578064Sume icmp6stat.icp6s_tooshort++; 88678064Sume goto freeit; 88778064Sume } 88862587Sitojun#ifndef PULLDOWN_TEST 88978064Sume IP6_EXTHDR_CHECK(m, off, 89078064Sume sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), 89178064Sume -1); 89278064Sume icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 89362587Sitojun#else 89478064Sume IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 89578064Sume sizeof(*icmp6) + sizeof(struct ip6_hdr)); 89678064Sume if (icmp6 == NULL) { 89778064Sume icmp6stat.icp6s_tooshort++; 89878064Sume return(-1); 89978064Sume } 90062587Sitojun#endif 90178064Sume eip6 = (struct ip6_hdr *)(icmp6 + 1); 90253541Sshin 90378064Sume /* Detect the upper level protocol */ 90478064Sume { 90553541Sshin void (*ctlfunc) __P((int, struct sockaddr *, void *)); 90653541Sshin u_int8_t nxt = eip6->ip6_nxt; 90753541Sshin int eoff = off + sizeof(struct icmp6_hdr) + 90853541Sshin sizeof(struct ip6_hdr); 90953541Sshin struct ip6ctlparam ip6cp; 91062587Sitojun struct in6_addr *finaldst = NULL; 91162587Sitojun int icmp6type = icmp6->icmp6_type; 91262587Sitojun struct ip6_frag *fh; 91362587Sitojun struct ip6_rthdr *rth; 91462587Sitojun struct ip6_rthdr0 *rth0; 91562587Sitojun int rthlen; 91653541Sshin 91795023Ssuz while (1) { /* XXX: should avoid infinite loop explicitly? */ 91853541Sshin struct ip6_ext *eh; 91953541Sshin 92078064Sume switch (nxt) { 92153541Sshin case IPPROTO_HOPOPTS: 92253541Sshin case IPPROTO_DSTOPTS: 92353541Sshin case IPPROTO_AH: 92462587Sitojun#ifndef PULLDOWN_TEST 92553541Sshin IP6_EXTHDR_CHECK(m, 0, eoff + 92653541Sshin sizeof(struct ip6_ext), 92778064Sume -1); 92853541Sshin eh = (struct ip6_ext *)(mtod(m, caddr_t) 92953541Sshin + eoff); 93062587Sitojun#else 93162587Sitojun IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 93278064Sume eoff, sizeof(*eh)); 93362587Sitojun if (eh == NULL) { 93462587Sitojun icmp6stat.icp6s_tooshort++; 93578064Sume return(-1); 93662587Sitojun } 93762587Sitojun#endif 93862587Sitojun 93953541Sshin if (nxt == IPPROTO_AH) 94053541Sshin eoff += (eh->ip6e_len + 2) << 2; 94153541Sshin else 94253541Sshin eoff += (eh->ip6e_len + 1) << 3; 94353541Sshin nxt = eh->ip6e_nxt; 94453541Sshin break; 94562587Sitojun case IPPROTO_ROUTING: 94662587Sitojun /* 94762587Sitojun * When the erroneous packet contains a 94862587Sitojun * routing header, we should examine the 94962587Sitojun * header to determine the final destination. 95062587Sitojun * Otherwise, we can't properly update 95162587Sitojun * information that depends on the final 95262587Sitojun * destination (e.g. path MTU). 95362587Sitojun */ 95462587Sitojun#ifndef PULLDOWN_TEST 95562587Sitojun IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), 95678064Sume -1); 95762587Sitojun rth = (struct ip6_rthdr *)(mtod(m, caddr_t) 95862587Sitojun + eoff); 95962587Sitojun#else 96062587Sitojun IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 96178064Sume eoff, sizeof(*rth)); 96262587Sitojun if (rth == NULL) { 96362587Sitojun icmp6stat.icp6s_tooshort++; 96478064Sume return(-1); 96562587Sitojun } 96662587Sitojun#endif 96762587Sitojun rthlen = (rth->ip6r_len + 1) << 3; 96862587Sitojun /* 96962587Sitojun * XXX: currently there is no 97062587Sitojun * officially defined type other 97162587Sitojun * than type-0. 97262587Sitojun * Note that if the segment left field 97362587Sitojun * is 0, all intermediate hops must 97462587Sitojun * have been passed. 97562587Sitojun */ 97662587Sitojun if (rth->ip6r_segleft && 97762587Sitojun rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 97862587Sitojun int hops; 97962587Sitojun 98062587Sitojun#ifndef PULLDOWN_TEST 98162587Sitojun IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, 98278064Sume -1); 98362587Sitojun rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff); 98462587Sitojun#else 98562587Sitojun IP6_EXTHDR_GET(rth0, 98662587Sitojun struct ip6_rthdr0 *, m, 98762587Sitojun eoff, rthlen); 98862587Sitojun if (rth0 == NULL) { 98962587Sitojun icmp6stat.icp6s_tooshort++; 99078064Sume return(-1); 99162587Sitojun } 99262587Sitojun#endif 99362587Sitojun /* just ignore a bogus header */ 99462587Sitojun if ((rth0->ip6r0_len % 2) == 0 && 99562587Sitojun (hops = rth0->ip6r0_len/2)) 99662587Sitojun finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 99762587Sitojun } 99862587Sitojun eoff += rthlen; 99962587Sitojun nxt = rth->ip6r_nxt; 100062587Sitojun break; 100162587Sitojun case IPPROTO_FRAGMENT: 100262587Sitojun#ifndef PULLDOWN_TEST 100362587Sitojun IP6_EXTHDR_CHECK(m, 0, eoff + 100462587Sitojun sizeof(struct ip6_frag), 100578064Sume -1); 100662587Sitojun fh = (struct ip6_frag *)(mtod(m, caddr_t) 100762587Sitojun + eoff); 100862587Sitojun#else 100962587Sitojun IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 101078064Sume eoff, sizeof(*fh)); 101162587Sitojun if (fh == NULL) { 101262587Sitojun icmp6stat.icp6s_tooshort++; 101378064Sume return(-1); 101462587Sitojun } 101562587Sitojun#endif 101662587Sitojun /* 101762587Sitojun * Data after a fragment header is meaningless 101862587Sitojun * unless it is the first fragment, but 101962587Sitojun * we'll go to the notify label for path MTU 102062587Sitojun * discovery. 102162587Sitojun */ 102262587Sitojun if (fh->ip6f_offlg & IP6F_OFF_MASK) 102362587Sitojun goto notify; 102462587Sitojun 102562587Sitojun eoff += sizeof(struct ip6_frag); 102662587Sitojun nxt = fh->ip6f_nxt; 102762587Sitojun break; 102853541Sshin default: 102962587Sitojun /* 103062587Sitojun * This case includes ESP and the No Next 103195023Ssuz * Header. In such cases going to the notify 103262587Sitojun * label does not have any meaning 103362587Sitojun * (i.e. ctlfunc will be NULL), but we go 103462587Sitojun * anyway since we might have to update 103562587Sitojun * path MTU information. 103662587Sitojun */ 103753541Sshin goto notify; 103853541Sshin } 103953541Sshin } 104078064Sume notify: 104162587Sitojun#ifndef PULLDOWN_TEST 104253541Sshin icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 104362587Sitojun#else 104462587Sitojun IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 104578064Sume sizeof(*icmp6) + sizeof(struct ip6_hdr)); 104662587Sitojun if (icmp6 == NULL) { 104762587Sitojun icmp6stat.icp6s_tooshort++; 104878064Sume return(-1); 104962587Sitojun } 105062587Sitojun#endif 105178064Sume 105278064Sume eip6 = (struct ip6_hdr *)(icmp6 + 1); 105378064Sume bzero(&icmp6dst, sizeof(icmp6dst)); 105478064Sume icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 105578064Sume icmp6dst.sin6_family = AF_INET6; 105678064Sume if (finaldst == NULL) 105778064Sume icmp6dst.sin6_addr = eip6->ip6_dst; 105878064Sume else 105978064Sume icmp6dst.sin6_addr = *finaldst; 106078064Sume icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 106178064Sume &icmp6dst.sin6_addr); 106278064Sume#ifndef SCOPEDROUTING 106378064Sume if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst, 106478064Sume NULL, NULL)) { 106578064Sume /* should be impossbile */ 106678064Sume nd6log((LOG_DEBUG, 106778064Sume "icmp6_notify_error: in6_embedscope failed\n")); 106878064Sume goto freeit; 106978064Sume } 107078064Sume#endif 107178064Sume 107278064Sume /* 107378064Sume * retrieve parameters from the inner IPv6 header, and convert 107478064Sume * them into sockaddr structures. 107578064Sume */ 107678064Sume bzero(&icmp6src, sizeof(icmp6src)); 107778064Sume icmp6src.sin6_len = sizeof(struct sockaddr_in6); 107878064Sume icmp6src.sin6_family = AF_INET6; 107978064Sume icmp6src.sin6_addr = eip6->ip6_src; 108078064Sume icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 108178064Sume &icmp6src.sin6_addr); 108278064Sume#ifndef SCOPEDROUTING 108378064Sume if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src, 108478064Sume NULL, NULL)) { 108578064Sume /* should be impossbile */ 108678064Sume nd6log((LOG_DEBUG, 108778064Sume "icmp6_notify_error: in6_embedscope failed\n")); 108878064Sume goto freeit; 108978064Sume } 109078064Sume#endif 109178064Sume icmp6src.sin6_flowinfo = 109278064Sume (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 109378064Sume 109478064Sume if (finaldst == NULL) 109578064Sume finaldst = &eip6->ip6_dst; 109678064Sume ip6cp.ip6c_m = m; 109778064Sume ip6cp.ip6c_icmp6 = icmp6; 109878064Sume ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 109978064Sume ip6cp.ip6c_off = eoff; 110078064Sume ip6cp.ip6c_finaldst = finaldst; 110178064Sume ip6cp.ip6c_src = &icmp6src; 110278064Sume ip6cp.ip6c_nxt = nxt; 110378064Sume 110462587Sitojun if (icmp6type == ICMP6_PACKET_TOO_BIG) { 110578064Sume notifymtu = ntohl(icmp6->icmp6_mtu); 110678064Sume ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 110778064Sume icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/ 110862587Sitojun } 110962587Sitojun 111053541Sshin ctlfunc = (void (*) __P((int, struct sockaddr *, void *))) 111153541Sshin (inet6sw[ip6_protox[nxt]].pr_ctlinput); 111253541Sshin if (ctlfunc) { 111378064Sume (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, 111478064Sume &ip6cp); 111553541Sshin } 111653541Sshin } 111778064Sume return(0); 111853541Sshin 111978064Sume freeit: 112053541Sshin m_freem(m); 112178064Sume return(-1); 112253541Sshin} 112353541Sshin 112478064Sumevoid 112578064Sumeicmp6_mtudisc_update(ip6cp, validated) 112678064Sume struct ip6ctlparam *ip6cp; 112778064Sume int validated; 112862587Sitojun{ 112978064Sume struct in6_addr *dst = ip6cp->ip6c_finaldst; 113078064Sume struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 113178064Sume struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 113262587Sitojun u_int mtu = ntohl(icmp6->icmp6_mtu); 113362587Sitojun struct rtentry *rt = NULL; 113462587Sitojun struct sockaddr_in6 sin6; 113562587Sitojun 113678064Sume if (!validated) 113778064Sume return; 113878064Sume 113962587Sitojun bzero(&sin6, sizeof(sin6)); 114062587Sitojun sin6.sin6_family = PF_INET6; 114162587Sitojun sin6.sin6_len = sizeof(struct sockaddr_in6); 114262587Sitojun sin6.sin6_addr = *dst; 114378064Sume /* XXX normally, this won't happen */ 114478064Sume if (IN6_IS_ADDR_LINKLOCAL(dst)) { 114578064Sume sin6.sin6_addr.s6_addr16[1] = 114678064Sume htons(m->m_pkthdr.rcvif->if_index); 114778064Sume } 114862587Sitojun /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 114962587Sitojun rt = rtalloc1((struct sockaddr *)&sin6, 0, 115062587Sitojun RTF_CLONING | RTF_PRCLONING); 115162587Sitojun 115262587Sitojun if (rt && (rt->rt_flags & RTF_HOST) 115362587Sitojun && !(rt->rt_rmx.rmx_locks & RTV_MTU)) { 115462587Sitojun if (mtu < IPV6_MMTU) { 115562587Sitojun /* xxx */ 115662587Sitojun rt->rt_rmx.rmx_locks |= RTV_MTU; 115762587Sitojun } else if (mtu < rt->rt_ifp->if_mtu && 115862587Sitojun rt->rt_rmx.rmx_mtu > mtu) { 115978064Sume icmp6stat.icp6s_pmtuchg++; 116062587Sitojun rt->rt_rmx.rmx_mtu = mtu; 116162587Sitojun } 116262587Sitojun } 116395023Ssuz if (rt) { /* XXX: need braces to avoid conflict with else in RTFREE. */ 116462587Sitojun RTFREE(rt); 116595023Ssuz } 116662587Sitojun} 116762587Sitojun 116853541Sshin/* 116978064Sume * Process a Node Information Query packet, based on 117078064Sume * draft-ietf-ipngwg-icmp-name-lookups-07. 117162587Sitojun * 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 */ 117962587Sitojun#define hostnamelen strlen(hostname) 118053541Sshinstatic struct mbuf * 118153541Sshinni6_input(m, off) 118253541Sshin struct mbuf *m; 118353541Sshin int off; 118453541Sshin{ 118562587Sitojun struct icmp6_nodeinfo *ni6, *nni6; 118653541Sshin struct mbuf *n = NULL; 118762587Sitojun u_int16_t qtype; 118862587Sitojun int subjlen; 118953541Sshin int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 119053541Sshin struct ni_reply_fqdn *fqdn; 119153541Sshin int addrs; /* for NI_QTYPE_NODEADDR */ 119253541Sshin struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 119378064Sume struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */ 119478064Sume struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */ 119562587Sitojun struct ip6_hdr *ip6; 119662587Sitojun int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 119778064Sume char *subj = NULL; 119878064Sume struct in6_ifaddr *ia6 = NULL; 119953541Sshin 120062587Sitojun ip6 = mtod(m, struct ip6_hdr *); 120162587Sitojun#ifndef PULLDOWN_TEST 120262587Sitojun ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 120362587Sitojun#else 120462587Sitojun IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 120562587Sitojun if (ni6 == NULL) { 120662587Sitojun /* m is already reclaimed */ 120762587Sitojun return NULL; 120862587Sitojun } 120962587Sitojun#endif 121053541Sshin 121162587Sitojun /* 121262587Sitojun * Validate IPv6 destination address. 121362587Sitojun * 121478064Sume * The Responder must discard the Query without further processing 121578064Sume * unless it is one of the Responder's unicast or anycast addresses, or 121678064Sume * a link-local scope multicast address which the Responder has joined. 121778064Sume * [icmp-name-lookups-07, Section 4.] 121862587Sitojun */ 121962587Sitojun bzero(&sin6, sizeof(sin6)); 122062587Sitojun sin6.sin6_family = AF_INET6; 122162587Sitojun sin6.sin6_len = sizeof(struct sockaddr_in6); 122262587Sitojun bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 122362587Sitojun /* XXX scopeid */ 122478064Sume if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) { 122578064Sume /* unicast/anycast, fine */ 122678064Sume if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 122778064Sume (icmp6_nodeinfo & 4) == 0) { 122878064Sume nd6log((LOG_DEBUG, "ni6_input: ignore node info to " 122978064Sume "a temporary address in %s:%d", 123078064Sume __FILE__, __LINE__)); 123178064Sume goto bad; 123278064Sume } 123378064Sume } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 123478064Sume ; /* link-local multicast, fine */ 123562587Sitojun else 123662587Sitojun goto bad; 123762587Sitojun 123878064Sume /* validate query Subject field. */ 123962587Sitojun qtype = ntohs(ni6->ni_qtype); 124062587Sitojun subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 124162587Sitojun switch (qtype) { 124262587Sitojun case NI_QTYPE_NOOP: 124362587Sitojun case NI_QTYPE_SUPTYPES: 124478064Sume /* 07 draft */ 124578064Sume if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 124678064Sume break; 124778064Sume /* FALLTHROUGH */ 124862587Sitojun case NI_QTYPE_FQDN: 124962587Sitojun case NI_QTYPE_NODEADDR: 125062587Sitojun switch (ni6->ni_code) { 125162587Sitojun case ICMP6_NI_SUBJ_IPV6: 125262587Sitojun#if ICMP6_NI_SUBJ_IPV6 != 0 125362587Sitojun case 0: 125462587Sitojun#endif 125562587Sitojun /* 125662587Sitojun * backward compatibility - try to accept 03 draft 125762587Sitojun * format, where no Subject is present. 125862587Sitojun */ 125978064Sume if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 126078064Sume subjlen == 0) { 126162587Sitojun oldfqdn++; 126262587Sitojun break; 126362587Sitojun } 126478064Sume#if ICMP6_NI_SUBJ_IPV6 != 0 126578064Sume if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 126678064Sume goto bad; 126778064Sume#endif 126862587Sitojun 126962587Sitojun if (subjlen != sizeof(sin6.sin6_addr)) 127062587Sitojun goto bad; 127162587Sitojun 127262587Sitojun /* 127362587Sitojun * Validate Subject address. 127462587Sitojun * 127578064Sume * Not sure what exactly "address belongs to the node" 127678064Sume * means in the spec, is it just unicast, or what? 127762587Sitojun * 127862587Sitojun * At this moment we consider Subject address as 127962587Sitojun * "belong to the node" if the Subject address equals 128062587Sitojun * to the IPv6 destination address; validation for 128162587Sitojun * IPv6 destination address should have done enough 128262587Sitojun * check for us. 128362587Sitojun * 128462587Sitojun * We do not do proxy at this moment. 128562587Sitojun */ 128662587Sitojun /* m_pulldown instead of copy? */ 128762587Sitojun m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 128862587Sitojun subjlen, (caddr_t)&sin6.sin6_addr); 128978064Sume sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 129078064Sume &sin6.sin6_addr); 129178064Sume#ifndef SCOPEDROUTING 129278064Sume in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL); 129362587Sitojun#endif 129478064Sume bzero(&sin6_d, sizeof(sin6_d)); 129578064Sume sin6_d.sin6_family = AF_INET6; /* not used, actually */ 129678064Sume sin6_d.sin6_len = sizeof(sin6_d); /* ditto */ 129778064Sume sin6_d.sin6_addr = ip6->ip6_dst; 129878064Sume sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 129978064Sume &ip6->ip6_dst); 130078064Sume#ifndef SCOPEDROUTING 130178064Sume in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL); 130278064Sume#endif 130378064Sume subj = (char *)&sin6; 130478064Sume if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d)) 130562587Sitojun break; 130678064Sume 130762587Sitojun /* 130862587Sitojun * XXX if we are to allow other cases, we should really 130962587Sitojun * be careful about scope here. 131062587Sitojun * basically, we should disallow queries toward IPv6 131162587Sitojun * destination X with subject Y, if scope(X) > scope(Y). 131262587Sitojun * if we allow scope(X) > scope(Y), it will result in 131362587Sitojun * information leakage across scope boundary. 131462587Sitojun */ 131562587Sitojun goto bad; 131662587Sitojun 131762587Sitojun case ICMP6_NI_SUBJ_FQDN: 131862587Sitojun /* 131962587Sitojun * Validate Subject name with gethostname(3). 132062587Sitojun * 132162587Sitojun * The behavior may need some debate, since: 132262587Sitojun * - we are not sure if the node has FQDN as 132362587Sitojun * hostname (returned by gethostname(3)). 132462587Sitojun * - the code does wildcard match for truncated names. 132562587Sitojun * however, we are not sure if we want to perform 132662587Sitojun * wildcard match, if gethostname(3) side has 132762587Sitojun * truncated hostname. 132862587Sitojun */ 132962587Sitojun n = ni6_nametodns(hostname, hostnamelen, 0); 133062587Sitojun if (!n || n->m_next || n->m_len == 0) 133162587Sitojun goto bad; 133262587Sitojun IP6_EXTHDR_GET(subj, char *, m, 133362587Sitojun off + sizeof(struct icmp6_nodeinfo), subjlen); 133462587Sitojun if (subj == NULL) 133562587Sitojun goto bad; 133662587Sitojun if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 133762587Sitojun n->m_len)) { 133862587Sitojun goto bad; 133962587Sitojun } 134062587Sitojun m_freem(n); 134162587Sitojun n = NULL; 134262587Sitojun break; 134362587Sitojun 134478064Sume case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 134562587Sitojun default: 134662587Sitojun goto bad; 134762587Sitojun } 134862587Sitojun break; 134978064Sume } 135062587Sitojun 135178064Sume /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 135278064Sume switch (qtype) { 135378064Sume case NI_QTYPE_FQDN: 135478064Sume if ((icmp6_nodeinfo & 1) == 0) 135578064Sume goto bad; 135678064Sume break; 135778064Sume case NI_QTYPE_NODEADDR: 135878064Sume if ((icmp6_nodeinfo & 2) == 0) 135978064Sume goto bad; 136078064Sume break; 136178064Sume } 136278064Sume 136378064Sume /* guess reply length */ 136478064Sume switch (qtype) { 136578064Sume case NI_QTYPE_NOOP: 136678064Sume break; /* no reply data */ 136778064Sume case NI_QTYPE_SUPTYPES: 136878064Sume replylen += sizeof(u_int32_t); 136978064Sume break; 137078064Sume case NI_QTYPE_FQDN: 137178064Sume /* XXX will append an mbuf */ 137278064Sume replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 137378064Sume break; 137478064Sume case NI_QTYPE_NODEADDR: 137578064Sume addrs = ni6_addrs(ni6, m, &ifp, subj); 137678064Sume if ((replylen += addrs * (sizeof(struct in6_addr) + 137778064Sume sizeof(u_int32_t))) > MCLBYTES) 137878064Sume replylen = MCLBYTES; /* XXX: will truncate pkt later */ 137978064Sume break; 138062587Sitojun default: 138178064Sume /* 138278064Sume * XXX: We must return a reply with the ICMP6 code 138378064Sume * `unknown Qtype' in this case. However we regard the case 138478064Sume * as an FQDN query for backward compatibility. 138578064Sume * Older versions set a random value to this field, 138678064Sume * so it rarely varies in the defined qtypes. 138778064Sume * But the mechanism is not reliable... 138878064Sume * maybe we should obsolete older versions. 138978064Sume */ 139078064Sume qtype = NI_QTYPE_FQDN; 139178064Sume /* XXX will append an mbuf */ 139278064Sume replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 139378064Sume oldfqdn++; 139478064Sume break; 139562587Sitojun } 139662587Sitojun 139778064Sume /* allocate an mbuf to reply. */ 1398111119Simp MGETHDR(n, M_DONTWAIT, m->m_type); 139962587Sitojun if (n == NULL) { 140062587Sitojun m_freem(m); 140153541Sshin return(NULL); 140262587Sitojun } 1403108466Ssam M_MOVE_PKTHDR(n, m); /* just for recvif */ 140453541Sshin if (replylen > MHLEN) { 140562587Sitojun if (replylen > MCLBYTES) { 140678064Sume /* 140778064Sume * XXX: should we try to allocate more? But MCLBYTES 140878064Sume * is probably much larger than IPV6_MMTU... 140978064Sume */ 141053541Sshin goto bad; 141162587Sitojun } 1412111119Simp MCLGET(n, M_DONTWAIT); 141353541Sshin if ((n->m_flags & M_EXT) == 0) { 141453541Sshin goto bad; 141553541Sshin } 141653541Sshin } 141753541Sshin n->m_pkthdr.len = n->m_len = replylen; 141853541Sshin 141953541Sshin /* copy mbuf header and IPv6 + Node Information base headers */ 142053541Sshin bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 142153541Sshin nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 142262587Sitojun bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 142353541Sshin 142453541Sshin /* qtype dependent procedure */ 142553541Sshin switch (qtype) { 142662587Sitojun case NI_QTYPE_NOOP: 142778064Sume nni6->ni_code = ICMP6_NI_SUCCESS; 142862587Sitojun nni6->ni_flags = 0; 142962587Sitojun break; 143062587Sitojun case NI_QTYPE_SUPTYPES: 143178064Sume { 143278064Sume u_int32_t v; 143378064Sume nni6->ni_code = ICMP6_NI_SUCCESS; 143478064Sume nni6->ni_flags = htons(0x0000); /* raw bitmap */ 143578064Sume /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 143678064Sume v = (u_int32_t)htonl(0x0000000f); 143778064Sume bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 143862587Sitojun break; 143978064Sume } 144062587Sitojun case NI_QTYPE_FQDN: 144178064Sume nni6->ni_code = ICMP6_NI_SUCCESS; 144262587Sitojun fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 144362587Sitojun sizeof(struct ip6_hdr) + 144462587Sitojun sizeof(struct icmp6_nodeinfo)); 144562587Sitojun nni6->ni_flags = 0; /* XXX: meaningless TTL */ 144662587Sitojun fqdn->ni_fqdn_ttl = 0; /* ditto. */ 144762587Sitojun /* 144862587Sitojun * XXX do we really have FQDN in variable "hostname"? 144962587Sitojun */ 145062587Sitojun n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 145162587Sitojun if (n->m_next == NULL) 145262587Sitojun goto bad; 145362587Sitojun /* XXX we assume that n->m_next is not a chain */ 145462587Sitojun if (n->m_next->m_next != NULL) 145562587Sitojun goto bad; 145662587Sitojun n->m_pkthdr.len += n->m_next->m_len; 145762587Sitojun break; 145862587Sitojun case NI_QTYPE_NODEADDR: 145962587Sitojun { 146062587Sitojun int lenlim, copied; 146153541Sshin 146278064Sume nni6->ni_code = ICMP6_NI_SUCCESS; 146378064Sume n->m_pkthdr.len = n->m_len = 146478064Sume sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 146578064Sume lenlim = M_TRAILINGSPACE(n); 146662587Sitojun copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 146762587Sitojun /* XXX: reset mbuf length */ 146862587Sitojun n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 146962587Sitojun sizeof(struct icmp6_nodeinfo) + copied; 147062587Sitojun break; 147153541Sshin } 147262587Sitojun default: 147362587Sitojun break; /* XXX impossible! */ 147462587Sitojun } 147553541Sshin 147653541Sshin nni6->ni_type = ICMP6_NI_REPLY; 147762587Sitojun m_freem(m); 147853541Sshin return(n); 147953541Sshin 148053541Sshin bad: 148162587Sitojun m_freem(m); 148253541Sshin if (n) 148353541Sshin m_freem(n); 148453541Sshin return(NULL); 148553541Sshin} 148653541Sshin#undef hostnamelen 148753541Sshin 148853541Sshin/* 148962587Sitojun * make a mbuf with DNS-encoded string. no compression support. 149062587Sitojun * 149162587Sitojun * XXX names with less than 2 dots (like "foo" or "foo.section") will be 149262587Sitojun * treated as truncated name (two \0 at the end). this is a wild guess. 149362587Sitojun */ 149462587Sitojunstatic struct mbuf * 149562587Sitojunni6_nametodns(name, namelen, old) 149662587Sitojun const char *name; 149762587Sitojun int namelen; 149862587Sitojun int old; /* return pascal string if non-zero */ 149962587Sitojun{ 150062587Sitojun struct mbuf *m; 150162587Sitojun char *cp, *ep; 150262587Sitojun const char *p, *q; 150362587Sitojun int i, len, nterm; 150462587Sitojun 150562587Sitojun if (old) 150662587Sitojun len = namelen + 1; 150762587Sitojun else 150862587Sitojun len = MCLBYTES; 150962587Sitojun 151062587Sitojun /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1511111119Simp MGET(m, M_DONTWAIT, MT_DATA); 151262587Sitojun if (m && len > MLEN) { 1513111119Simp MCLGET(m, M_DONTWAIT); 151462587Sitojun if ((m->m_flags & M_EXT) == 0) 151562587Sitojun goto fail; 151662587Sitojun } 151762587Sitojun if (!m) 151862587Sitojun goto fail; 151962587Sitojun m->m_next = NULL; 152062587Sitojun 152162587Sitojun if (old) { 152262587Sitojun m->m_len = len; 152362587Sitojun *mtod(m, char *) = namelen; 152462587Sitojun bcopy(name, mtod(m, char *) + 1, namelen); 152562587Sitojun return m; 152662587Sitojun } else { 152762587Sitojun m->m_len = 0; 152862587Sitojun cp = mtod(m, char *); 152962587Sitojun ep = mtod(m, char *) + M_TRAILINGSPACE(m); 153062587Sitojun 153162587Sitojun /* if not certain about my name, return empty buffer */ 153262587Sitojun if (namelen == 0) 153362587Sitojun return m; 153462587Sitojun 153562587Sitojun /* 153662587Sitojun * guess if it looks like shortened hostname, or FQDN. 153762587Sitojun * shortened hostname needs two trailing "\0". 153862587Sitojun */ 153962587Sitojun i = 0; 154062587Sitojun for (p = name; p < name + namelen; p++) { 154162587Sitojun if (*p && *p == '.') 154262587Sitojun i++; 154362587Sitojun } 154462587Sitojun if (i < 2) 154562587Sitojun nterm = 2; 154662587Sitojun else 154762587Sitojun nterm = 1; 154862587Sitojun 154962587Sitojun p = name; 155062587Sitojun while (cp < ep && p < name + namelen) { 155162587Sitojun i = 0; 155262587Sitojun for (q = p; q < name + namelen && *q && *q != '.'; q++) 155362587Sitojun i++; 155462587Sitojun /* result does not fit into mbuf */ 155562587Sitojun if (cp + i + 1 >= ep) 155662587Sitojun goto fail; 155778704Sume /* 155878704Sume * DNS label length restriction, RFC1035 page 8. 155978704Sume * "i == 0" case is included here to avoid returning 156078704Sume * 0-length label on "foo..bar". 156178704Sume */ 156278704Sume if (i <= 0 || i >= 64) 156362587Sitojun goto fail; 156462587Sitojun *cp++ = i; 156562587Sitojun bcopy(p, cp, i); 156662587Sitojun cp += i; 156762587Sitojun p = q; 156862587Sitojun if (p < name + namelen && *p == '.') 156962587Sitojun p++; 157062587Sitojun } 157162587Sitojun /* termination */ 157262587Sitojun if (cp + nterm >= ep) 157362587Sitojun goto fail; 157462587Sitojun while (nterm-- > 0) 157562587Sitojun *cp++ = '\0'; 157662587Sitojun m->m_len = cp - mtod(m, char *); 157762587Sitojun return m; 157862587Sitojun } 157962587Sitojun 158062587Sitojun panic("should not reach here"); 158195023Ssuz /* NOTREACHED */ 158262587Sitojun 158362587Sitojun fail: 158462587Sitojun if (m) 158562587Sitojun m_freem(m); 158662587Sitojun return NULL; 158762587Sitojun} 158862587Sitojun 158962587Sitojun/* 159062587Sitojun * check if two DNS-encoded string matches. takes care of truncated 159162587Sitojun * form (with \0\0 at the end). no compression support. 159278064Sume * XXX upper/lowercase match (see RFC2065) 159362587Sitojun */ 159462587Sitojunstatic int 159562587Sitojunni6_dnsmatch(a, alen, b, blen) 159662587Sitojun const char *a; 159762587Sitojun int alen; 159862587Sitojun const char *b; 159962587Sitojun int blen; 160062587Sitojun{ 160162587Sitojun const char *a0, *b0; 160262587Sitojun int l; 160362587Sitojun 160462587Sitojun /* simplest case - need validation? */ 160562587Sitojun if (alen == blen && bcmp(a, b, alen) == 0) 160662587Sitojun return 1; 160762587Sitojun 160862587Sitojun a0 = a; 160962587Sitojun b0 = b; 161062587Sitojun 161162587Sitojun /* termination is mandatory */ 161262587Sitojun if (alen < 2 || blen < 2) 161362587Sitojun return 0; 161462587Sitojun if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 161562587Sitojun return 0; 161662587Sitojun alen--; 161762587Sitojun blen--; 161862587Sitojun 161962587Sitojun while (a - a0 < alen && b - b0 < blen) { 162062587Sitojun if (a - a0 + 1 > alen || b - b0 + 1 > blen) 162162587Sitojun return 0; 162262587Sitojun 162362587Sitojun if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 162462587Sitojun return 0; 162562587Sitojun /* we don't support compression yet */ 162662587Sitojun if (a[0] >= 64 || b[0] >= 64) 162762587Sitojun return 0; 162862587Sitojun 162962587Sitojun /* truncated case */ 163062587Sitojun if (a[0] == 0 && a - a0 == alen - 1) 163162587Sitojun return 1; 163262587Sitojun if (b[0] == 0 && b - b0 == blen - 1) 163362587Sitojun return 1; 163462587Sitojun if (a[0] == 0 || b[0] == 0) 163562587Sitojun return 0; 163662587Sitojun 163762587Sitojun if (a[0] != b[0]) 163862587Sitojun return 0; 163962587Sitojun l = a[0]; 164062587Sitojun if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 164162587Sitojun return 0; 164262587Sitojun if (bcmp(a + 1, b + 1, l) != 0) 164362587Sitojun return 0; 164462587Sitojun 164562587Sitojun a += 1 + l; 164662587Sitojun b += 1 + l; 164762587Sitojun } 164862587Sitojun 164962587Sitojun if (a - a0 == alen && b - b0 == blen) 165062587Sitojun return 1; 165162587Sitojun else 165262587Sitojun return 0; 165362587Sitojun} 165462587Sitojun 165562587Sitojun/* 165653541Sshin * calculate the number of addresses to be returned in the node info reply. 165753541Sshin */ 165853541Sshinstatic int 165978064Sumeni6_addrs(ni6, m, ifpp, subj) 166053541Sshin struct icmp6_nodeinfo *ni6; 166153541Sshin struct mbuf *m; 166253541Sshin struct ifnet **ifpp; 166378064Sume char *subj; 166453541Sshin{ 166578064Sume struct ifnet *ifp; 166678064Sume struct in6_ifaddr *ifa6; 166778064Sume struct ifaddr *ifa; 166878064Sume struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 166953541Sshin int addrs = 0, addrsofif, iffound = 0; 167078064Sume int niflags = ni6->ni_flags; 167153541Sshin 167278064Sume if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 167378064Sume switch (ni6->ni_code) { 167478064Sume case ICMP6_NI_SUBJ_IPV6: 167578064Sume if (subj == NULL) /* must be impossible... */ 167678064Sume return(0); 167778064Sume subj_ip6 = (struct sockaddr_in6 *)subj; 167878064Sume break; 167978064Sume default: 168078064Sume /* 168178064Sume * XXX: we only support IPv6 subject address for 168278064Sume * this Qtype. 168378064Sume */ 168478064Sume return(0); 168578064Sume } 168678064Sume } 168778064Sume 1688108172Shsu IFNET_RLOCK(); 168953541Sshin for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 169053541Sshin { 169153541Sshin addrsofif = 0; 169279139Sume TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 169353541Sshin { 169453541Sshin if (ifa->ifa_addr->sa_family != AF_INET6) 169553541Sshin continue; 169653541Sshin ifa6 = (struct in6_ifaddr *)ifa; 169753541Sshin 169878064Sume if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 169978064Sume IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 170053541Sshin &ifa6->ia_addr.sin6_addr)) 170153541Sshin iffound = 1; 170253541Sshin 170362587Sitojun /* 170462587Sitojun * IPv4-mapped addresses can only be returned by a 170562587Sitojun * Node Information proxy, since they represent 170662587Sitojun * addresses of IPv4-only nodes, which perforce do 170762587Sitojun * not implement this protocol. 170878064Sume * [icmp-name-lookups-07, Section 5.4] 170962587Sitojun * So we don't support NI_NODEADDR_FLAG_COMPAT in 171062587Sitojun * this function at this moment. 171162587Sitojun */ 171262587Sitojun 171353541Sshin /* What do we have to do about ::1? */ 171478064Sume switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 171578064Sume case IPV6_ADDR_SCOPE_LINKLOCAL: 171678064Sume if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 171778064Sume continue; 171853541Sshin break; 171978064Sume case IPV6_ADDR_SCOPE_SITELOCAL: 172078064Sume if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 172178064Sume continue; 172253541Sshin break; 172378064Sume case IPV6_ADDR_SCOPE_GLOBAL: 172478064Sume if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 172578064Sume continue; 172678064Sume break; 172778064Sume default: 172878064Sume continue; 172953541Sshin } 173078064Sume 173178064Sume /* 173278064Sume * check if anycast is okay. 173395023Ssuz * XXX: just experimental. not in the spec. 173478064Sume */ 173578064Sume if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 173678064Sume (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 173778064Sume continue; /* we need only unicast addresses */ 173878064Sume if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 173978064Sume (icmp6_nodeinfo & 4) == 0) { 174078064Sume continue; 174178064Sume } 174278064Sume addrsofif++; /* count the address */ 174353541Sshin } 174453541Sshin if (iffound) { 174553541Sshin *ifpp = ifp; 1746108172Shsu IFNET_RUNLOCK(); 174753541Sshin return(addrsofif); 174853541Sshin } 174953541Sshin 175053541Sshin addrs += addrsofif; 175153541Sshin } 1752108172Shsu IFNET_RUNLOCK(); 175353541Sshin 175453541Sshin return(addrs); 175553541Sshin} 175653541Sshin 175753541Sshinstatic int 175853541Sshinni6_store_addrs(ni6, nni6, ifp0, resid) 175953541Sshin struct icmp6_nodeinfo *ni6, *nni6; 176053541Sshin struct ifnet *ifp0; 176153541Sshin int resid; 176253541Sshin{ 176378064Sume struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); 176478064Sume struct in6_ifaddr *ifa6; 176578064Sume struct ifaddr *ifa; 176678064Sume struct ifnet *ifp_dep = NULL; 176778064Sume int copied = 0, allow_deprecated = 0; 176853541Sshin u_char *cp = (u_char *)(nni6 + 1); 176978064Sume int niflags = ni6->ni_flags; 177078064Sume u_int32_t ltime; 177153541Sshin 177278064Sume if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 177353541Sshin return(0); /* needless to copy */ 1774108172Shsu 1775108172Shsu IFNET_RLOCK(); 177678064Sume again: 177753541Sshin for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) 177853541Sshin { 177962587Sitojun for (ifa = ifp->if_addrlist.tqh_first; ifa; 178062587Sitojun ifa = ifa->ifa_list.tqe_next) 178153541Sshin { 178253541Sshin if (ifa->ifa_addr->sa_family != AF_INET6) 178353541Sshin continue; 178453541Sshin ifa6 = (struct in6_ifaddr *)ifa; 178553541Sshin 178678064Sume if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 178778064Sume allow_deprecated == 0) { 178878064Sume /* 178978064Sume * prefererred address should be put before 179078064Sume * deprecated addresses. 179178064Sume */ 179278064Sume 179378064Sume /* record the interface for later search */ 179478064Sume if (ifp_dep == NULL) 179578064Sume ifp_dep = ifp; 179678064Sume 179778064Sume continue; 179862587Sitojun } 179978064Sume else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 180078064Sume allow_deprecated != 0) 180178064Sume continue; /* we now collect deprecated addrs */ 180253541Sshin 180353541Sshin /* What do we have to do about ::1? */ 180478064Sume switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 180578064Sume case IPV6_ADDR_SCOPE_LINKLOCAL: 180678064Sume if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 180778064Sume continue; 180853541Sshin break; 180978064Sume case IPV6_ADDR_SCOPE_SITELOCAL: 181078064Sume if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 181178064Sume continue; 181253541Sshin break; 181378064Sume case IPV6_ADDR_SCOPE_GLOBAL: 181478064Sume if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 181578064Sume continue; 181678064Sume break; 181778064Sume default: 181878064Sume continue; 181953541Sshin } 182053541Sshin 182178064Sume /* 182278064Sume * check if anycast is okay. 182378064Sume * XXX: just experimental. not in the spec. 182478064Sume */ 182578064Sume if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 182678064Sume (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 182778064Sume continue; 182878064Sume if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 182978064Sume (icmp6_nodeinfo & 4) == 0) { 183078064Sume continue; 183153541Sshin } 183278064Sume 183378064Sume /* now we can copy the address */ 183478064Sume if (resid < sizeof(struct in6_addr) + 183578064Sume sizeof(u_int32_t)) { 183678064Sume /* 183778064Sume * We give up much more copy. 183878064Sume * Set the truncate flag and return. 183978064Sume */ 184078064Sume nni6->ni_flags |= 184178064Sume NI_NODEADDR_FLAG_TRUNCATE; 1842108172Shsu IFNET_RUNLOCK(); 184378064Sume return(copied); 184478064Sume } 184578064Sume 184678064Sume /* 184778064Sume * Set the TTL of the address. 184878064Sume * The TTL value should be one of the following 184978064Sume * according to the specification: 185078064Sume * 185178064Sume * 1. The remaining lifetime of a DHCP lease on the 185278064Sume * address, or 185378064Sume * 2. The remaining Valid Lifetime of a prefix from 185478064Sume * which the address was derived through Stateless 185578064Sume * Autoconfiguration. 185678064Sume * 185778064Sume * Note that we currently do not support stateful 185878064Sume * address configuration by DHCPv6, so the former 185978064Sume * case can't happen. 186078064Sume */ 186178064Sume if (ifa6->ia6_lifetime.ia6t_expire == 0) 186278064Sume ltime = ND6_INFINITE_LIFETIME; 186378064Sume else { 186478064Sume if (ifa6->ia6_lifetime.ia6t_expire > 186578064Sume time_second) 186678064Sume ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second); 186778064Sume else 186878064Sume ltime = 0; 186978064Sume } 187078064Sume 187178064Sume bcopy(<ime, cp, sizeof(u_int32_t)); 187278064Sume cp += sizeof(u_int32_t); 187378064Sume 187478064Sume /* copy the address itself */ 187578064Sume bcopy(&ifa6->ia_addr.sin6_addr, cp, 187678064Sume sizeof(struct in6_addr)); 187778064Sume /* XXX: KAME link-local hack; remove ifindex */ 187878064Sume if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) 187978064Sume ((struct in6_addr *)cp)->s6_addr16[1] = 0; 188078064Sume cp += sizeof(struct in6_addr); 188178064Sume 188278064Sume resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 188378064Sume copied += (sizeof(struct in6_addr) + 188478064Sume sizeof(u_int32_t)); 188553541Sshin } 188653541Sshin if (ifp0) /* we need search only on the specified IF */ 188753541Sshin break; 188853541Sshin } 188953541Sshin 189078064Sume if (allow_deprecated == 0 && ifp_dep != NULL) { 189178064Sume ifp = ifp_dep; 189278064Sume allow_deprecated = 1; 189378064Sume 189478064Sume goto again; 189578064Sume } 189678064Sume 1897108172Shsu IFNET_RUNLOCK(); 1898108172Shsu 189953541Sshin return(copied); 190053541Sshin} 190153541Sshin 190253541Sshin/* 190353541Sshin * XXX almost dup'ed code with rip6_input. 190453541Sshin */ 190553541Sshinstatic int 190653541Sshinicmp6_rip6_input(mp, off) 190753541Sshin struct mbuf **mp; 190853541Sshin int off; 190953541Sshin{ 191053541Sshin struct mbuf *m = *mp; 191178064Sume struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 191278064Sume struct in6pcb *in6p; 191353541Sshin struct in6pcb *last = NULL; 191453541Sshin struct sockaddr_in6 rip6src; 191553541Sshin struct icmp6_hdr *icmp6; 191653541Sshin struct mbuf *opts = NULL; 191753541Sshin 191862587Sitojun#ifndef PULLDOWN_TEST 191953541Sshin /* this is assumed to be safe. */ 192053541Sshin icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 192162587Sitojun#else 192262587Sitojun IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 192362587Sitojun if (icmp6 == NULL) { 192462587Sitojun /* m is already reclaimed */ 192562587Sitojun return IPPROTO_DONE; 192662587Sitojun } 192762587Sitojun#endif 192853541Sshin 192953541Sshin bzero(&rip6src, sizeof(rip6src)); 193053541Sshin rip6src.sin6_len = sizeof(struct sockaddr_in6); 193153541Sshin rip6src.sin6_family = AF_INET6; 193262587Sitojun /* KAME hack: recover scopeid */ 193362587Sitojun (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif); 193453541Sshin 193553541Sshin LIST_FOREACH(in6p, &ripcb, inp_list) 193653541Sshin { 193778064Sume if ((in6p->inp_vflag & INP_IPV6) == 0) 193853541Sshin continue; 193978064Sume#ifdef HAVE_NRL_INPCB 194078064Sume if (!(in6p->in6p_flags & INP_IPV6)) 194178064Sume continue; 194278064Sume#endif 194353541Sshin if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) 194453541Sshin continue; 194553541Sshin if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 194653541Sshin !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 194753541Sshin continue; 194853541Sshin if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 194953541Sshin !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 195053541Sshin continue; 195153541Sshin if (in6p->in6p_icmp6filt 195253541Sshin && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 195353541Sshin in6p->in6p_icmp6filt)) 195453541Sshin continue; 195553541Sshin if (last) { 195653541Sshin struct mbuf *n; 195753541Sshin if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 195853541Sshin if (last->in6p_flags & IN6P_CONTROLOPTS) 195953541Sshin ip6_savecontrol(last, &opts, ip6, n); 196053541Sshin /* strip intermediate headers */ 196153541Sshin m_adj(n, off); 196253541Sshin if (sbappendaddr(&last->in6p_socket->so_rcv, 196353541Sshin (struct sockaddr *)&rip6src, 196453541Sshin n, opts) == 0) { 196553541Sshin /* should notify about lost packet */ 196653541Sshin m_freem(n); 196778064Sume if (opts) { 196853541Sshin m_freem(opts); 196978064Sume } 197097658Stanimura } else 197153541Sshin sorwakeup(last->in6p_socket); 197253541Sshin opts = NULL; 197353541Sshin } 197453541Sshin } 197553541Sshin last = in6p; 197653541Sshin } 197753541Sshin if (last) { 197853541Sshin if (last->in6p_flags & IN6P_CONTROLOPTS) 197953541Sshin ip6_savecontrol(last, &opts, ip6, m); 198053541Sshin /* strip intermediate headers */ 198153541Sshin m_adj(m, off); 198253541Sshin if (sbappendaddr(&last->in6p_socket->so_rcv, 198378064Sume (struct sockaddr *)&rip6src, m, opts) == 0) { 198453541Sshin m_freem(m); 198553541Sshin if (opts) 198653541Sshin m_freem(opts); 198797658Stanimura } else 198853541Sshin sorwakeup(last->in6p_socket); 198953541Sshin } else { 199053541Sshin m_freem(m); 199153541Sshin ip6stat.ip6s_delivered--; 199253541Sshin } 199353541Sshin return IPPROTO_DONE; 199453541Sshin} 199553541Sshin 199653541Sshin/* 199753541Sshin * Reflect the ip6 packet back to the source. 199862587Sitojun * OFF points to the icmp6 header, counted from the top of the mbuf. 199953541Sshin */ 200053541Sshinvoid 200153541Sshinicmp6_reflect(m, off) 200253541Sshin struct mbuf *m; 200353541Sshin size_t off; 200453541Sshin{ 200562587Sitojun struct ip6_hdr *ip6; 200653541Sshin struct icmp6_hdr *icmp6; 200753541Sshin struct in6_ifaddr *ia; 200853541Sshin struct in6_addr t, *src = 0; 200962587Sitojun int plen; 201053541Sshin int type, code; 201153541Sshin struct ifnet *outif = NULL; 201278064Sume struct sockaddr_in6 sa6_src, sa6_dst; 201353541Sshin#ifdef COMPAT_RFC1885 201453541Sshin int mtu = IPV6_MMTU; 201553541Sshin struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst; 201653541Sshin#endif 201753541Sshin 201862587Sitojun /* too short to reflect */ 201962587Sitojun if (off < sizeof(struct ip6_hdr)) { 202078064Sume nd6log((LOG_DEBUG, 202178064Sume "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 202278064Sume (u_long)off, (u_long)sizeof(struct ip6_hdr), 202378064Sume __FILE__, __LINE__)); 202462587Sitojun goto bad; 202562587Sitojun } 202662587Sitojun 202753541Sshin /* 202853541Sshin * If there are extra headers between IPv6 and ICMPv6, strip 202953541Sshin * off that header first. 203053541Sshin */ 203162587Sitojun#ifdef DIAGNOSTIC 203262587Sitojun if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 203362587Sitojun panic("assumption failed in icmp6_reflect"); 203462587Sitojun#endif 203562587Sitojun if (off > sizeof(struct ip6_hdr)) { 203662587Sitojun size_t l; 203762587Sitojun struct ip6_hdr nip6; 203853541Sshin 203962587Sitojun l = off - sizeof(struct ip6_hdr); 204062587Sitojun m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 204162587Sitojun m_adj(m, l); 204262587Sitojun l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 204362587Sitojun if (m->m_len < l) { 204462587Sitojun if ((m = m_pullup(m, l)) == NULL) 204562587Sitojun return; 204653541Sshin } 204762587Sitojun bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 204862587Sitojun } else /* off == sizeof(struct ip6_hdr) */ { 204962587Sitojun size_t l; 205062587Sitojun l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 205162587Sitojun if (m->m_len < l) { 205262587Sitojun if ((m = m_pullup(m, l)) == NULL) 205362587Sitojun return; 205453541Sshin } 205553541Sshin } 205662587Sitojun plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 205762587Sitojun ip6 = mtod(m, struct ip6_hdr *); 205862587Sitojun ip6->ip6_nxt = IPPROTO_ICMPV6; 205953541Sshin icmp6 = (struct icmp6_hdr *)(ip6 + 1); 206053541Sshin type = icmp6->icmp6_type; /* keep type for statistics */ 206153541Sshin code = icmp6->icmp6_code; /* ditto. */ 206253541Sshin 206353541Sshin t = ip6->ip6_dst; 206453541Sshin /* 206553541Sshin * ip6_input() drops a packet if its src is multicast. 206653541Sshin * So, the src is never multicast. 206753541Sshin */ 206853541Sshin ip6->ip6_dst = ip6->ip6_src; 206953541Sshin 207078064Sume /* 207178064Sume * XXX: make sure to embed scope zone information, using 207278064Sume * already embedded IDs or the received interface (if any). 207378064Sume * Note that rcvif may be NULL. 207478064Sume * TODO: scoped routing case (XXX). 207578064Sume */ 207678064Sume bzero(&sa6_src, sizeof(sa6_src)); 207778064Sume sa6_src.sin6_family = AF_INET6; 207878064Sume sa6_src.sin6_len = sizeof(sa6_src); 207978064Sume sa6_src.sin6_addr = ip6->ip6_dst; 208078064Sume in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif); 208178064Sume in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL); 208278064Sume bzero(&sa6_dst, sizeof(sa6_dst)); 208378064Sume sa6_dst.sin6_family = AF_INET6; 208478064Sume sa6_dst.sin6_len = sizeof(sa6_dst); 208578064Sume sa6_dst.sin6_addr = t; 208678064Sume in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif); 208778064Sume in6_embedscope(&t, &sa6_dst, NULL, NULL); 208853541Sshin 208953541Sshin#ifdef COMPAT_RFC1885 209053541Sshin /* 209153541Sshin * xxx guess MTU 209253541Sshin * RFC 1885 requires that echo reply should be truncated if it 209353541Sshin * does not fit in with (return) path MTU, but the description was 209453541Sshin * removed in the new spec. 209553541Sshin */ 209653541Sshin if (icmp6_reflect_rt.ro_rt == 0 || 209753541Sshin ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) { 209853541Sshin if (icmp6_reflect_rt.ro_rt) { 209953541Sshin RTFREE(icmp6_reflect_rt.ro_rt); 210053541Sshin icmp6_reflect_rt.ro_rt = 0; 210153541Sshin } 210253541Sshin bzero(sin6, sizeof(*sin6)); 210353541Sshin sin6->sin6_family = PF_INET6; 210453541Sshin sin6->sin6_len = sizeof(struct sockaddr_in6); 210553541Sshin sin6->sin6_addr = ip6->ip6_dst; 210653541Sshin 210753541Sshin rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt, 210853541Sshin RTF_PRCLONING); 210953541Sshin } 211053541Sshin 211153541Sshin if (icmp6_reflect_rt.ro_rt == 0) 211253541Sshin goto bad; 211353541Sshin 211453541Sshin if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST) 211553541Sshin && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu) 211653541Sshin mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu; 211753541Sshin 211853541Sshin if (mtu < m->m_pkthdr.len) { 211953541Sshin plen -= (m->m_pkthdr.len - mtu); 212053541Sshin m_adj(m, mtu - m->m_pkthdr.len); 212153541Sshin } 212253541Sshin#endif 212353541Sshin /* 212453541Sshin * If the incoming packet was addressed directly to us(i.e. unicast), 212553541Sshin * use dst as the src for the reply. 212662587Sitojun * The IN6_IFF_NOTREADY case would be VERY rare, but is possible 212762587Sitojun * (for example) when we encounter an error while forwarding procedure 212862587Sitojun * destined to a duplicated address of ours. 212953541Sshin */ 213053541Sshin for (ia = in6_ifaddr; ia; ia = ia->ia_next) 213153541Sshin if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 213262587Sitojun (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 213353541Sshin src = &t; 213453541Sshin break; 213553541Sshin } 213653541Sshin if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 213753541Sshin /* 213853541Sshin * This is the case if the dst is our link-local address 213995023Ssuz * and the sender is also ourselves. 214053541Sshin */ 214153541Sshin src = &t; 214253541Sshin } 214353541Sshin 214478064Sume if (src == 0) { 214578064Sume int e; 214678064Sume struct route_in6 ro; 214778064Sume 214853541Sshin /* 214962587Sitojun * This case matches to multicasts, our anycast, or unicasts 215095023Ssuz * that we do not own. Select a source address based on the 215178064Sume * source address of the erroneous packet. 215253541Sshin */ 215378064Sume bzero(&ro, sizeof(ro)); 215478064Sume src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e); 215578064Sume if (ro.ro_rt) 215678064Sume RTFREE(ro.ro_rt); /* XXX: we could use this */ 215778064Sume if (src == NULL) { 215878064Sume nd6log((LOG_DEBUG, 215978064Sume "icmp6_reflect: source can't be determined: " 216078064Sume "dst=%s, error=%d\n", 216178064Sume ip6_sprintf(&sa6_src.sin6_addr), e)); 216278064Sume goto bad; 216378064Sume } 216478064Sume } 216553541Sshin 216653541Sshin ip6->ip6_src = *src; 216753541Sshin 216853541Sshin ip6->ip6_flow = 0; 216962587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 217062587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 217153541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 217253541Sshin if (m->m_pkthdr.rcvif) { 217353541Sshin /* XXX: This may not be the outgoing interface */ 217453541Sshin ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim; 217578064Sume } else 217678064Sume ip6->ip6_hlim = ip6_defhlim; 217753541Sshin 217853541Sshin icmp6->icmp6_cksum = 0; 217953541Sshin icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 218053541Sshin sizeof(struct ip6_hdr), plen); 218153541Sshin 218253541Sshin /* 218378064Sume * XXX option handling 218453541Sshin */ 218553541Sshin 218653541Sshin m->m_flags &= ~(M_BCAST|M_MCAST); 218753541Sshin 218853541Sshin#ifdef COMPAT_RFC1885 2189105194Ssam ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL); 219053541Sshin#else 2191105194Ssam ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 219253541Sshin#endif 219353541Sshin if (outif) 219453541Sshin icmp6_ifoutstat_inc(outif, type, code); 219553541Sshin 219653541Sshin return; 219753541Sshin 219853541Sshin bad: 219953541Sshin m_freem(m); 220053541Sshin return; 220153541Sshin} 220253541Sshin 220353541Sshinvoid 220453541Sshinicmp6_fasttimo() 220553541Sshin{ 220662587Sitojun 220753541Sshin mld6_fasttimeo(); 220853541Sshin} 220953541Sshin 221053541Sshinstatic const char * 221153541Sshinicmp6_redirect_diag(src6, dst6, tgt6) 221253541Sshin struct in6_addr *src6; 221353541Sshin struct in6_addr *dst6; 221453541Sshin struct in6_addr *tgt6; 221553541Sshin{ 221653541Sshin static char buf[1024]; 221753541Sshin snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 221853541Sshin ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 221953541Sshin return buf; 222053541Sshin} 222153541Sshin 222253541Sshinvoid 222353541Sshinicmp6_redirect_input(m, off) 222478064Sume struct mbuf *m; 222553541Sshin int off; 222653541Sshin{ 222753541Sshin struct ifnet *ifp = m->m_pkthdr.rcvif; 222853541Sshin struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 222962587Sitojun struct nd_redirect *nd_rd; 223053541Sshin int icmp6len = ntohs(ip6->ip6_plen); 223153541Sshin char *lladdr = NULL; 223253541Sshin int lladdrlen = 0; 223353541Sshin u_char *redirhdr = NULL; 223453541Sshin int redirhdrlen = 0; 223553541Sshin struct rtentry *rt = NULL; 223653541Sshin int is_router; 223753541Sshin int is_onlink; 223853541Sshin struct in6_addr src6 = ip6->ip6_src; 223962587Sitojun struct in6_addr redtgt6; 224062587Sitojun struct in6_addr reddst6; 224153541Sshin union nd_opts ndopts; 224253541Sshin 224353541Sshin if (!m || !ifp) 224453541Sshin return; 224553541Sshin 224653541Sshin /* XXX if we are router, we don't update route by icmp6 redirect */ 224753541Sshin if (ip6_forwarding) 224862587Sitojun goto freeit; 224953541Sshin if (!icmp6_rediraccept) 225062587Sitojun goto freeit; 225162587Sitojun 225262587Sitojun#ifndef PULLDOWN_TEST 225362587Sitojun IP6_EXTHDR_CHECK(m, off, icmp6len,); 225462587Sitojun nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 225562587Sitojun#else 225662587Sitojun IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 225762587Sitojun if (nd_rd == NULL) { 225862587Sitojun icmp6stat.icp6s_tooshort++; 225953541Sshin return; 226062587Sitojun } 226162587Sitojun#endif 226262587Sitojun redtgt6 = nd_rd->nd_rd_target; 226362587Sitojun reddst6 = nd_rd->nd_rd_dst; 226453541Sshin 226553541Sshin if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 226653541Sshin redtgt6.s6_addr16[1] = htons(ifp->if_index); 226753541Sshin if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 226853541Sshin reddst6.s6_addr16[1] = htons(ifp->if_index); 226953541Sshin 227053541Sshin /* validation */ 227153541Sshin if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 227278064Sume nd6log((LOG_ERR, 227353541Sshin "ICMP6 redirect sent from %s rejected; " 227478064Sume "must be from linklocal\n", ip6_sprintf(&src6))); 227578064Sume goto bad; 227653541Sshin } 227753541Sshin if (ip6->ip6_hlim != 255) { 227878064Sume nd6log((LOG_ERR, 227953541Sshin "ICMP6 redirect sent from %s rejected; " 228053541Sshin "hlim=%d (must be 255)\n", 228178064Sume ip6_sprintf(&src6), ip6->ip6_hlim)); 228278064Sume goto bad; 228353541Sshin } 228453541Sshin { 228553541Sshin /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 228653541Sshin struct sockaddr_in6 sin6; 228753541Sshin struct in6_addr *gw6; 228853541Sshin 228953541Sshin bzero(&sin6, sizeof(sin6)); 229053541Sshin sin6.sin6_family = AF_INET6; 229153541Sshin sin6.sin6_len = sizeof(struct sockaddr_in6); 229253541Sshin bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 229353541Sshin rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 229453541Sshin if (rt) { 229565895Sume if (rt->rt_gateway == NULL || 229665895Sume rt->rt_gateway->sa_family != AF_INET6) { 229778064Sume nd6log((LOG_ERR, 229865895Sume "ICMP6 redirect rejected; no route " 229965895Sume "with inet6 gateway found for redirect dst: %s\n", 230078064Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 230165895Sume RTFREE(rt); 230278064Sume goto bad; 230365895Sume } 230465895Sume 230553541Sshin gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 230653541Sshin if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 230778064Sume nd6log((LOG_ERR, 230853541Sshin "ICMP6 redirect rejected; " 230953541Sshin "not equal to gw-for-src=%s (must be same): " 231053541Sshin "%s\n", 231153541Sshin ip6_sprintf(gw6), 231278064Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 231353541Sshin RTFREE(rt); 231478064Sume goto bad; 231553541Sshin } 231653541Sshin } else { 231778064Sume nd6log((LOG_ERR, 231853541Sshin "ICMP6 redirect rejected; " 231953541Sshin "no route found for redirect dst: %s\n", 232078064Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 232178064Sume goto bad; 232253541Sshin } 232353541Sshin RTFREE(rt); 232453541Sshin rt = NULL; 232553541Sshin } 232653541Sshin if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 232778064Sume nd6log((LOG_ERR, 232853541Sshin "ICMP6 redirect rejected; " 232953541Sshin "redirect dst must be unicast: %s\n", 233078064Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 233178064Sume goto bad; 233253541Sshin } 233353541Sshin 233453541Sshin is_router = is_onlink = 0; 233553541Sshin if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 233653541Sshin is_router = 1; /* router case */ 233753541Sshin if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 233853541Sshin is_onlink = 1; /* on-link destination case */ 233953541Sshin if (!is_router && !is_onlink) { 234078064Sume nd6log((LOG_ERR, 234153541Sshin "ICMP6 redirect rejected; " 234253541Sshin "neither router case nor onlink case: %s\n", 234378064Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 234478064Sume goto bad; 234553541Sshin } 234653541Sshin /* validation passed */ 234753541Sshin 234853541Sshin icmp6len -= sizeof(*nd_rd); 234953541Sshin nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 235053541Sshin if (nd6_options(&ndopts) < 0) { 235178064Sume nd6log((LOG_INFO, "icmp6_redirect_input: " 235253541Sshin "invalid ND option, rejected: %s\n", 235378064Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 235478064Sume /* nd6_options have incremented stats */ 235562587Sitojun goto freeit; 235653541Sshin } 235753541Sshin 235853541Sshin if (ndopts.nd_opts_tgt_lladdr) { 235953541Sshin lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 236053541Sshin lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 236153541Sshin } 236253541Sshin 236353541Sshin if (ndopts.nd_opts_rh) { 236453541Sshin redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 236553541Sshin redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 236653541Sshin } 236753541Sshin 236853541Sshin if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 236978064Sume nd6log((LOG_INFO, 237053541Sshin "icmp6_redirect_input: lladdrlen mismatch for %s " 237153541Sshin "(if %d, icmp6 packet %d): %s\n", 237253541Sshin ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 237378064Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 237478064Sume goto bad; 237553541Sshin } 237653541Sshin 237753541Sshin /* RFC 2461 8.3 */ 237853541Sshin nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 237953541Sshin is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 238053541Sshin 238195023Ssuz if (!is_onlink) { /* better router case. perform rtredirect. */ 238253541Sshin /* perform rtredirect */ 238353541Sshin struct sockaddr_in6 sdst; 238453541Sshin struct sockaddr_in6 sgw; 238553541Sshin struct sockaddr_in6 ssrc; 238653541Sshin 238753541Sshin bzero(&sdst, sizeof(sdst)); 238853541Sshin bzero(&sgw, sizeof(sgw)); 238953541Sshin bzero(&ssrc, sizeof(ssrc)); 239053541Sshin sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 239153541Sshin sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 239253541Sshin sizeof(struct sockaddr_in6); 239353541Sshin bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 239453541Sshin bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 239553541Sshin bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 239653541Sshin rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 239753541Sshin (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 239853541Sshin (struct sockaddr *)&ssrc, 239953541Sshin (struct rtentry **)NULL); 240053541Sshin } 240153541Sshin /* finally update cached route in each socket via pfctlinput */ 240253541Sshin { 240353541Sshin struct sockaddr_in6 sdst; 240453541Sshin 240553541Sshin bzero(&sdst, sizeof(sdst)); 240653541Sshin sdst.sin6_family = AF_INET6; 240753541Sshin sdst.sin6_len = sizeof(struct sockaddr_in6); 240853541Sshin bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 240953541Sshin pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 241053541Sshin#ifdef IPSEC 241153541Sshin key_sa_routechange((struct sockaddr *)&sdst); 241253541Sshin#endif 241353541Sshin } 241462587Sitojun 241562587Sitojun freeit: 241662587Sitojun m_freem(m); 241778064Sume return; 241878064Sume 241978064Sume bad: 242078064Sume icmp6stat.icp6s_badredirect++; 242178064Sume m_freem(m); 242253541Sshin} 242353541Sshin 242453541Sshinvoid 242553541Sshinicmp6_redirect_output(m0, rt) 242653541Sshin struct mbuf *m0; 242753541Sshin struct rtentry *rt; 242853541Sshin{ 242953541Sshin struct ifnet *ifp; /* my outgoing interface */ 243053541Sshin struct in6_addr *ifp_ll6; 243153541Sshin struct in6_addr *router_ll6; 243253541Sshin struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 243353541Sshin struct mbuf *m = NULL; /* newly allocated one */ 243453541Sshin struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 243553541Sshin struct nd_redirect *nd_rd; 243653541Sshin size_t maxlen; 243753541Sshin u_char *p; 243853541Sshin struct ifnet *outif = NULL; 243962587Sitojun struct sockaddr_in6 src_sa; 244053541Sshin 244162587Sitojun icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 244262587Sitojun 244353541Sshin /* if we are not router, we don't send icmp6 redirect */ 244453541Sshin if (!ip6_forwarding || ip6_accept_rtadv) 244553541Sshin goto fail; 244653541Sshin 244753541Sshin /* sanity check */ 244853541Sshin if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 244953541Sshin goto fail; 245053541Sshin 245153541Sshin /* 245253541Sshin * Address check: 245353541Sshin * the source address must identify a neighbor, and 245453541Sshin * the destination address must not be a multicast address 245553541Sshin * [RFC 2461, sec 8.2] 245653541Sshin */ 245753541Sshin sip6 = mtod(m0, struct ip6_hdr *); 245862587Sitojun bzero(&src_sa, sizeof(src_sa)); 245962587Sitojun src_sa.sin6_family = AF_INET6; 246062587Sitojun src_sa.sin6_len = sizeof(src_sa); 246162587Sitojun src_sa.sin6_addr = sip6->ip6_src; 246262587Sitojun /* we don't currently use sin6_scope_id, but eventually use it */ 246362587Sitojun src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); 246462587Sitojun if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 246553541Sshin goto fail; 246653541Sshin if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 246753541Sshin goto fail; /* what should we do here? */ 246853541Sshin 246953541Sshin /* rate limit */ 247053541Sshin if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 247153541Sshin goto fail; 247253541Sshin 247353541Sshin /* 247453541Sshin * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 247553541Sshin * we almost always ask for an mbuf cluster for simplicity. 247653541Sshin * (MHLEN < IPV6_MMTU is almost always true) 247753541Sshin */ 247862587Sitojun#if IPV6_MMTU >= MCLBYTES 247962587Sitojun# error assumption failed about IPV6_MMTU and MCLBYTES 248062587Sitojun#endif 2481111119Simp MGETHDR(m, M_DONTWAIT, MT_HEADER); 248262587Sitojun if (m && IPV6_MMTU >= MHLEN) 2483111119Simp MCLGET(m, M_DONTWAIT); 248453541Sshin if (!m) 248553541Sshin goto fail; 248678064Sume m->m_pkthdr.rcvif = NULL; 248778064Sume m->m_len = 0; 248878064Sume maxlen = M_TRAILINGSPACE(m); 248953541Sshin maxlen = min(IPV6_MMTU, maxlen); 249053541Sshin /* just for safety */ 249162587Sitojun if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 249262587Sitojun ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 249353541Sshin goto fail; 249462587Sitojun } 249553541Sshin 249653541Sshin { 249753541Sshin /* get ip6 linklocal address for ifp(my outgoing interface). */ 249862587Sitojun struct in6_ifaddr *ia; 249962587Sitojun if ((ia = in6ifa_ifpforlinklocal(ifp, 250062587Sitojun IN6_IFF_NOTREADY| 250162587Sitojun IN6_IFF_ANYCAST)) == NULL) 250253541Sshin goto fail; 250353541Sshin ifp_ll6 = &ia->ia_addr.sin6_addr; 250453541Sshin } 250553541Sshin 250653541Sshin /* get ip6 linklocal address for the router. */ 250753541Sshin if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 250853541Sshin struct sockaddr_in6 *sin6; 250953541Sshin sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 251053541Sshin router_ll6 = &sin6->sin6_addr; 251153541Sshin if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 251253541Sshin router_ll6 = (struct in6_addr *)NULL; 251353541Sshin } else 251453541Sshin router_ll6 = (struct in6_addr *)NULL; 251553541Sshin 251653541Sshin /* ip6 */ 251753541Sshin ip6 = mtod(m, struct ip6_hdr *); 251853541Sshin ip6->ip6_flow = 0; 251962587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 252062587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 252153541Sshin /* ip6->ip6_plen will be set later */ 252253541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 252353541Sshin ip6->ip6_hlim = 255; 252453541Sshin /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 252553541Sshin bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 252653541Sshin bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 252753541Sshin 252853541Sshin /* ND Redirect */ 252953541Sshin nd_rd = (struct nd_redirect *)(ip6 + 1); 253053541Sshin nd_rd->nd_rd_type = ND_REDIRECT; 253153541Sshin nd_rd->nd_rd_code = 0; 253253541Sshin nd_rd->nd_rd_reserved = 0; 253353541Sshin if (rt->rt_flags & RTF_GATEWAY) { 253453541Sshin /* 253553541Sshin * nd_rd->nd_rd_target must be a link-local address in 253653541Sshin * better router cases. 253753541Sshin */ 253853541Sshin if (!router_ll6) 253953541Sshin goto fail; 254053541Sshin bcopy(router_ll6, &nd_rd->nd_rd_target, 254153541Sshin sizeof(nd_rd->nd_rd_target)); 254253541Sshin bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 254353541Sshin sizeof(nd_rd->nd_rd_dst)); 254453541Sshin } else { 254553541Sshin /* make sure redtgt == reddst */ 254653541Sshin bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 254753541Sshin sizeof(nd_rd->nd_rd_target)); 254853541Sshin bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 254953541Sshin sizeof(nd_rd->nd_rd_dst)); 255053541Sshin } 255153541Sshin 255253541Sshin p = (u_char *)(nd_rd + 1); 255353541Sshin 255453541Sshin if (!router_ll6) 255553541Sshin goto nolladdropt; 255653541Sshin 255753541Sshin { 255853541Sshin /* target lladdr option */ 255953541Sshin struct rtentry *rt_router = NULL; 256053541Sshin int len; 256153541Sshin struct sockaddr_dl *sdl; 256253541Sshin struct nd_opt_hdr *nd_opt; 256353541Sshin char *lladdr; 256453541Sshin 256553541Sshin rt_router = nd6_lookup(router_ll6, 0, ifp); 256653541Sshin if (!rt_router) 256753541Sshin goto nolladdropt; 256862587Sitojun len = sizeof(*nd_opt) + ifp->if_addrlen; 256995023Ssuz len = (len + 7) & ~7; /* round by 8 */ 257062587Sitojun /* safety check */ 257162587Sitojun if (len + (p - (u_char *)ip6) > maxlen) 257262587Sitojun goto nolladdropt; 257362587Sitojun if (!(rt_router->rt_flags & RTF_GATEWAY) && 257462587Sitojun (rt_router->rt_flags & RTF_LLINFO) && 257562587Sitojun (rt_router->rt_gateway->sa_family == AF_LINK) && 257662587Sitojun (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) && 257762587Sitojun sdl->sdl_alen) { 257853541Sshin nd_opt = (struct nd_opt_hdr *)p; 257953541Sshin nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 258053541Sshin nd_opt->nd_opt_len = len >> 3; 258153541Sshin lladdr = (char *)(nd_opt + 1); 258253541Sshin bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 258362587Sitojun p += len; 258453541Sshin } 258553541Sshin } 258653541Sshinnolladdropt:; 258753541Sshin 258853541Sshin m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 258953541Sshin 259053541Sshin /* just to be safe */ 259162587Sitojun#ifdef M_DECRYPTED /*not openbsd*/ 259253541Sshin if (m0->m_flags & M_DECRYPTED) 259353541Sshin goto noredhdropt; 259462587Sitojun#endif 259562587Sitojun if (p - (u_char *)ip6 > maxlen) 259662587Sitojun goto noredhdropt; 259753541Sshin 259853541Sshin { 259953541Sshin /* redirected header option */ 260053541Sshin int len; 260153541Sshin struct nd_opt_rd_hdr *nd_opt_rh; 260253541Sshin 260353541Sshin /* 260453541Sshin * compute the maximum size for icmp6 redirect header option. 260553541Sshin * XXX room for auth header? 260653541Sshin */ 260753541Sshin len = maxlen - (p - (u_char *)ip6); 260853541Sshin len &= ~7; 260953541Sshin 261053541Sshin /* This is just for simplicity. */ 261153541Sshin if (m0->m_pkthdr.len != m0->m_len) { 261253541Sshin if (m0->m_next) { 261353541Sshin m_freem(m0->m_next); 261453541Sshin m0->m_next = NULL; 261553541Sshin } 261653541Sshin m0->m_pkthdr.len = m0->m_len; 261753541Sshin } 261853541Sshin 261953541Sshin /* 262053541Sshin * Redirected header option spec (RFC2461 4.6.3) talks nothing 262153541Sshin * about padding/truncate rule for the original IP packet. 262253541Sshin * From the discussion on IPv6imp in Feb 1999, the consensus was: 262353541Sshin * - "attach as much as possible" is the goal 262453541Sshin * - pad if not aligned (original size can be guessed by original 262553541Sshin * ip6 header) 262653541Sshin * Following code adds the padding if it is simple enough, 262753541Sshin * and truncates if not. 262853541Sshin */ 262953541Sshin if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 263053541Sshin panic("assumption failed in %s:%d\n", __FILE__, __LINE__); 263153541Sshin 263253541Sshin if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 263353541Sshin /* not enough room, truncate */ 263453541Sshin m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 263553541Sshin } else { 263653541Sshin /* enough room, pad or truncate */ 263753541Sshin size_t extra; 263853541Sshin 263953541Sshin extra = m0->m_pkthdr.len % 8; 264053541Sshin if (extra) { 264153541Sshin /* pad if easy enough, truncate if not */ 264253541Sshin if (8 - extra <= M_TRAILINGSPACE(m0)) { 264353541Sshin /* pad */ 264453541Sshin m0->m_len += (8 - extra); 264553541Sshin m0->m_pkthdr.len += (8 - extra); 264653541Sshin } else { 264753541Sshin /* truncate */ 264853541Sshin m0->m_pkthdr.len -= extra; 264953541Sshin m0->m_len -= extra; 265053541Sshin } 265153541Sshin } 265253541Sshin len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 265353541Sshin m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 265453541Sshin } 265553541Sshin 265653541Sshin nd_opt_rh = (struct nd_opt_rd_hdr *)p; 265753541Sshin bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 265853541Sshin nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 265953541Sshin nd_opt_rh->nd_opt_rh_len = len >> 3; 266053541Sshin p += sizeof(*nd_opt_rh); 266153541Sshin m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 266253541Sshin 266353541Sshin /* connect m0 to m */ 2664112781Ssuz m_tag_delete_chain(m0, NULL); 2665112781Ssuz m0->m_flags &= ~M_PKTHDR; 266653541Sshin m->m_next = m0; 266753541Sshin m->m_pkthdr.len = m->m_len + m0->m_len; 2668112781Ssuz m0 = NULL; 266953541Sshin } 267053541Sshinnoredhdropt:; 2671112781Ssuz if (m0) { 2672112781Ssuz m_freem(m0); 2673112781Ssuz m0 = NULL; 2674112781Ssuz } 267553541Sshin 267653541Sshin if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src)) 267753541Sshin sip6->ip6_src.s6_addr16[1] = 0; 267853541Sshin if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst)) 267953541Sshin sip6->ip6_dst.s6_addr16[1] = 0; 268062587Sitojun#if 0 268162587Sitojun if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 268262587Sitojun ip6->ip6_src.s6_addr16[1] = 0; 268362587Sitojun if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 268462587Sitojun ip6->ip6_dst.s6_addr16[1] = 0; 268562587Sitojun#endif 268653541Sshin if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target)) 268753541Sshin nd_rd->nd_rd_target.s6_addr16[1] = 0; 268853541Sshin if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst)) 268953541Sshin nd_rd->nd_rd_dst.s6_addr16[1] = 0; 269053541Sshin 269153541Sshin ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 269253541Sshin 269353541Sshin nd_rd->nd_rd_cksum = 0; 269453541Sshin nd_rd->nd_rd_cksum 269553541Sshin = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 269653541Sshin 269753541Sshin /* send the packet to outside... */ 2698105194Ssam ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 269953541Sshin if (outif) { 270053541Sshin icmp6_ifstat_inc(outif, ifs6_out_msg); 270153541Sshin icmp6_ifstat_inc(outif, ifs6_out_redirect); 270253541Sshin } 270353541Sshin icmp6stat.icp6s_outhist[ND_REDIRECT]++; 270453541Sshin 270553541Sshin return; 270653541Sshin 270753541Sshinfail: 270853541Sshin if (m) 270953541Sshin m_freem(m); 271053541Sshin if (m0) 271153541Sshin m_freem(m0); 271253541Sshin} 271353541Sshin 271478064Sume#ifdef HAVE_NRL_INPCB 271578064Sume#define sotoin6pcb sotoinpcb 271678064Sume#define in6pcb inpcb 271778064Sume#define in6p_icmp6filt inp_icmp6filt 271878064Sume#endif 271953541Sshin/* 272053541Sshin * ICMPv6 socket option processing. 272153541Sshin */ 272253541Sshinint 272353541Sshinicmp6_ctloutput(so, sopt) 272453541Sshin struct socket *so; 272553541Sshin struct sockopt *sopt; 272653541Sshin{ 272753541Sshin int error = 0; 272853541Sshin int optlen; 272978064Sume struct inpcb *inp = sotoinpcb(so); 273053541Sshin int level, op, optname; 273153541Sshin 273253541Sshin if (sopt) { 273353541Sshin level = sopt->sopt_level; 273453541Sshin op = sopt->sopt_dir; 273553541Sshin optname = sopt->sopt_name; 273653541Sshin optlen = sopt->sopt_valsize; 273753541Sshin } else 273853541Sshin level = op = optname = optlen = 0; 273978064Sume 274053541Sshin if (level != IPPROTO_ICMPV6) { 274153541Sshin return EINVAL; 274253541Sshin } 274353541Sshin 274478064Sume switch (op) { 274553541Sshin case PRCO_SETOPT: 274653541Sshin switch (optname) { 274753541Sshin case ICMP6_FILTER: 274853541Sshin { 274953541Sshin struct icmp6_filter *p; 275053541Sshin 275153541Sshin if (optlen != sizeof(*p)) { 275253541Sshin error = EMSGSIZE; 275353541Sshin break; 275453541Sshin } 275553541Sshin if (inp->in6p_icmp6filt == NULL) { 275653541Sshin error = EINVAL; 275753541Sshin break; 275853541Sshin } 275953541Sshin error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen, 276053541Sshin optlen); 276153541Sshin break; 276253541Sshin } 276353541Sshin 276453541Sshin default: 276553541Sshin error = ENOPROTOOPT; 276653541Sshin break; 276753541Sshin } 276853541Sshin break; 276953541Sshin 277053541Sshin case PRCO_GETOPT: 277153541Sshin switch (optname) { 277253541Sshin case ICMP6_FILTER: 277353541Sshin { 277453541Sshin if (inp->in6p_icmp6filt == NULL) { 277553541Sshin error = EINVAL; 277653541Sshin break; 277753541Sshin } 277853541Sshin error = sooptcopyout(sopt, inp->in6p_icmp6filt, 277953541Sshin sizeof(struct icmp6_filter)); 278053541Sshin break; 278153541Sshin } 278253541Sshin 278353541Sshin default: 278453541Sshin error = ENOPROTOOPT; 278553541Sshin break; 278653541Sshin } 278753541Sshin break; 278853541Sshin } 278953541Sshin 279053541Sshin return(error); 279153541Sshin} 279278064Sume#ifdef HAVE_NRL_INPCB 279378064Sume#undef sotoin6pcb 279478064Sume#undef in6pcb 279578064Sume#undef in6p_icmp6filt 279678064Sume#endif 279753541Sshin 279878064Sume#ifndef HAVE_PPSRATECHECK 279978064Sume#ifndef timersub 280078064Sume#define timersub(tvp, uvp, vvp) \ 280178064Sume do { \ 280278064Sume (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \ 280378064Sume (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \ 280478064Sume if ((vvp)->tv_usec < 0) { \ 280578064Sume (vvp)->tv_sec--; \ 280678064Sume (vvp)->tv_usec += 1000000; \ 280778064Sume } \ 280878064Sume } while (0) 280978064Sume#endif 281078064Sume 281153541Sshin/* 281278064Sume * ppsratecheck(): packets (or events) per second limitation. 281362587Sitojun */ 281462587Sitojunstatic int 281578064Sumeppsratecheck(lasttime, curpps, maxpps) 281678064Sume struct timeval *lasttime; 281778064Sume int *curpps; 281878064Sume int maxpps; /* maximum pps allowed */ 281962587Sitojun{ 282078064Sume struct timeval tv, delta; 282178064Sume int s, rv; 282262587Sitojun 282378064Sume s = splclock(); 282478064Sume microtime(&tv); 282578064Sume splx(s); 282662587Sitojun 282778064Sume timersub(&tv, lasttime, &delta); 282862587Sitojun 282978064Sume /* 283095023Ssuz * Check for 0,0 so that the message will be seen at least once. 283195023Ssuz * If more than one second has passed since the last update of 283278064Sume * lasttime, reset the counter. 283378064Sume * 283495023Ssuz * We do increment *curpps even in *curpps < maxpps case, as some may 283578064Sume * try to use *curpps for stat purposes as well. 283678064Sume */ 283778064Sume if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) || 283878064Sume delta.tv_sec >= 1) { 283978064Sume *lasttime = tv; 284078064Sume *curpps = 0; 284178064Sume rv = 1; 284278064Sume } else if (maxpps < 0) 284378064Sume rv = 1; 284478064Sume else if (*curpps < maxpps) 284578064Sume rv = 1; 284678064Sume else 284778064Sume rv = 0; 284862587Sitojun 284995023Ssuz#if 1 /* DIAGNOSTIC? */ 285078064Sume /* be careful about wrap-around */ 285178064Sume if (*curpps + 1 > *curpps) 285278064Sume *curpps = *curpps + 1; 285378064Sume#else 285478064Sume /* 285578064Sume * assume that there's not too many calls to this function. 285678064Sume * not sure if the assumption holds, as it depends on *caller's* 285778064Sume * behavior, not the behavior of this function. 285878064Sume * IMHO it is wrong to make assumption on the caller's behavior, 285978064Sume * so the above #if is #if 1, not #ifdef DIAGNOSTIC. 286078064Sume */ 286178064Sume *curpps = *curpps + 1; 286278064Sume#endif 286378064Sume 286478064Sume return (rv); 286562587Sitojun} 286662587Sitojun#endif 286762587Sitojun 286862587Sitojun/* 286953541Sshin * Perform rate limit check. 287053541Sshin * Returns 0 if it is okay to send the icmp6 packet. 287153541Sshin * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 287253541Sshin * limitation. 287353541Sshin * 287453541Sshin * XXX per-destination/type check necessary? 287553541Sshin */ 287653541Sshinstatic int 287753541Sshinicmp6_ratelimit(dst, type, code) 287853541Sshin const struct in6_addr *dst; /* not used at this moment */ 287953541Sshin const int type; /* not used at this moment */ 288053541Sshin const int code; /* not used at this moment */ 288153541Sshin{ 288262587Sitojun int ret; 288353541Sshin 288495023Ssuz ret = 0; /* okay to send */ 288553541Sshin 288662587Sitojun /* PPS limit */ 288778064Sume if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 288878064Sume icmp6errppslim)) { 288953541Sshin /* The packet is subject to rate limit */ 289062587Sitojun ret++; 289153541Sshin } 289253541Sshin 289362587Sitojun return ret; 289453541Sshin} 2895