icmp6.c revision 120891
162587Sitojun/* $FreeBSD: head/sys/netinet6/icmp6.c 120891 2003-10-07 17:46:18Z ume $ */ 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 /* 557120891Sume * 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 /* 592120891Sume * 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: 645120891Sume /* XXX: these two are experimental. not officially defined. */ 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), 667120891Sume 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 678120891Sume 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. */ 851120856Sume 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; 877113799Sobrien int off, icmp6len, code; 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, 890120891Sume sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1); 89178064Sume icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 89262587Sitojun#else 89378064Sume IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 894120891Sume sizeof(*icmp6) + sizeof(struct ip6_hdr)); 89578064Sume if (icmp6 == NULL) { 89678064Sume icmp6stat.icp6s_tooshort++; 897120856Sume return (-1); 89878064Sume } 89962587Sitojun#endif 90078064Sume eip6 = (struct ip6_hdr *)(icmp6 + 1); 90153541Sshin 90278064Sume /* Detect the upper level protocol */ 90378064Sume { 90453541Sshin void (*ctlfunc) __P((int, struct sockaddr *, void *)); 90553541Sshin u_int8_t nxt = eip6->ip6_nxt; 90653541Sshin int eoff = off + sizeof(struct icmp6_hdr) + 907120891Sume sizeof(struct ip6_hdr); 90853541Sshin struct ip6ctlparam ip6cp; 90962587Sitojun struct in6_addr *finaldst = NULL; 91062587Sitojun int icmp6type = icmp6->icmp6_type; 91162587Sitojun struct ip6_frag *fh; 91262587Sitojun struct ip6_rthdr *rth; 91362587Sitojun struct ip6_rthdr0 *rth0; 91462587Sitojun int rthlen; 91553541Sshin 91695023Ssuz while (1) { /* XXX: should avoid infinite loop explicitly? */ 91753541Sshin struct ip6_ext *eh; 91853541Sshin 91978064Sume switch (nxt) { 92053541Sshin case IPPROTO_HOPOPTS: 92153541Sshin case IPPROTO_DSTOPTS: 92253541Sshin case IPPROTO_AH: 92362587Sitojun#ifndef PULLDOWN_TEST 924120891Sume IP6_EXTHDR_CHECK(m, 0, 925120891Sume eoff + sizeof(struct ip6_ext), -1); 92653541Sshin eh = (struct ip6_ext *)(mtod(m, caddr_t) 92753541Sshin + eoff); 92862587Sitojun#else 92962587Sitojun IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 930120891Sume eoff, sizeof(*eh)); 93162587Sitojun if (eh == NULL) { 93262587Sitojun icmp6stat.icp6s_tooshort++; 933120856Sume return (-1); 93462587Sitojun } 93562587Sitojun#endif 936120891Sume 93753541Sshin if (nxt == IPPROTO_AH) 93853541Sshin eoff += (eh->ip6e_len + 2) << 2; 93953541Sshin else 94053541Sshin eoff += (eh->ip6e_len + 1) << 3; 94153541Sshin nxt = eh->ip6e_nxt; 94253541Sshin break; 94362587Sitojun case IPPROTO_ROUTING: 94462587Sitojun /* 94562587Sitojun * When the erroneous packet contains a 94662587Sitojun * routing header, we should examine the 94762587Sitojun * header to determine the final destination. 94862587Sitojun * Otherwise, we can't properly update 94962587Sitojun * information that depends on the final 95062587Sitojun * destination (e.g. path MTU). 95162587Sitojun */ 95262587Sitojun#ifndef PULLDOWN_TEST 953120891Sume IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1); 954120891Sume rth = (struct ip6_rthdr *) 955120891Sume (mtod(m, caddr_t) + eoff); 95662587Sitojun#else 95762587Sitojun IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 958120891Sume eoff, sizeof(*rth)); 95962587Sitojun if (rth == NULL) { 96062587Sitojun icmp6stat.icp6s_tooshort++; 961120856Sume return (-1); 96262587Sitojun } 96362587Sitojun#endif 96462587Sitojun rthlen = (rth->ip6r_len + 1) << 3; 96562587Sitojun /* 96662587Sitojun * XXX: currently there is no 96762587Sitojun * officially defined type other 96862587Sitojun * than type-0. 96962587Sitojun * Note that if the segment left field 97062587Sitojun * is 0, all intermediate hops must 97162587Sitojun * have been passed. 97262587Sitojun */ 97362587Sitojun if (rth->ip6r_segleft && 97462587Sitojun rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 97562587Sitojun int hops; 97662587Sitojun 97762587Sitojun#ifndef PULLDOWN_TEST 978120891Sume IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1); 979120891Sume rth0 = (struct ip6_rthdr0 *) 980120891Sume (mtod(m, caddr_t) + eoff); 98162587Sitojun#else 98262587Sitojun IP6_EXTHDR_GET(rth0, 983120891Sume struct ip6_rthdr0 *, m, 984120891Sume eoff, rthlen); 98562587Sitojun if (rth0 == NULL) { 98662587Sitojun icmp6stat.icp6s_tooshort++; 987120856Sume return (-1); 98862587Sitojun } 98962587Sitojun#endif 99062587Sitojun /* just ignore a bogus header */ 99162587Sitojun if ((rth0->ip6r0_len % 2) == 0 && 99262587Sitojun (hops = rth0->ip6r0_len/2)) 99362587Sitojun finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 99462587Sitojun } 99562587Sitojun eoff += rthlen; 99662587Sitojun nxt = rth->ip6r_nxt; 99762587Sitojun break; 99862587Sitojun case IPPROTO_FRAGMENT: 99962587Sitojun#ifndef PULLDOWN_TEST 100062587Sitojun IP6_EXTHDR_CHECK(m, 0, eoff + 1001120891Sume sizeof(struct ip6_frag), -1); 1002120891Sume fh = (struct ip6_frag *)(mtod(m, caddr_t) + 1003120891Sume eoff); 100462587Sitojun#else 100562587Sitojun IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1006120891Sume eoff, sizeof(*fh)); 100762587Sitojun if (fh == NULL) { 100862587Sitojun icmp6stat.icp6s_tooshort++; 1009120856Sume return (-1); 101062587Sitojun } 101162587Sitojun#endif 101262587Sitojun /* 101362587Sitojun * Data after a fragment header is meaningless 101462587Sitojun * unless it is the first fragment, but 101562587Sitojun * we'll go to the notify label for path MTU 101662587Sitojun * discovery. 101762587Sitojun */ 101862587Sitojun if (fh->ip6f_offlg & IP6F_OFF_MASK) 101962587Sitojun goto notify; 102062587Sitojun 102162587Sitojun eoff += sizeof(struct ip6_frag); 102262587Sitojun nxt = fh->ip6f_nxt; 102362587Sitojun break; 102453541Sshin default: 102562587Sitojun /* 102662587Sitojun * This case includes ESP and the No Next 102795023Ssuz * Header. In such cases going to the notify 102862587Sitojun * label does not have any meaning 102962587Sitojun * (i.e. ctlfunc will be NULL), but we go 103062587Sitojun * anyway since we might have to update 103162587Sitojun * path MTU information. 103262587Sitojun */ 103353541Sshin goto notify; 103453541Sshin } 103553541Sshin } 103678064Sume notify: 103762587Sitojun#ifndef PULLDOWN_TEST 103853541Sshin icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 103962587Sitojun#else 104062587Sitojun IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1041120891Sume sizeof(*icmp6) + sizeof(struct ip6_hdr)); 104262587Sitojun if (icmp6 == NULL) { 104362587Sitojun icmp6stat.icp6s_tooshort++; 1044120856Sume return (-1); 104562587Sitojun } 104662587Sitojun#endif 104778064Sume 1048120891Sume /* 1049120891Sume * retrieve parameters from the inner IPv6 header, and convert 1050120891Sume * them into sockaddr structures. 1051120891Sume * XXX: there is no guarantee that the source or destination 1052120891Sume * addresses of the inner packet are in the same scope as 1053120891Sume * the addresses of the icmp packet. But there is no other 1054120891Sume * way to determine the zone. 1055120891Sume */ 105678064Sume eip6 = (struct ip6_hdr *)(icmp6 + 1); 1057120891Sume 105878064Sume bzero(&icmp6dst, sizeof(icmp6dst)); 105978064Sume icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 106078064Sume icmp6dst.sin6_family = AF_INET6; 106178064Sume if (finaldst == NULL) 106278064Sume icmp6dst.sin6_addr = eip6->ip6_dst; 106378064Sume else 106478064Sume icmp6dst.sin6_addr = *finaldst; 106578064Sume icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 106678064Sume &icmp6dst.sin6_addr); 106778064Sume#ifndef SCOPEDROUTING 106878064Sume if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst, 106978064Sume NULL, NULL)) { 107078064Sume /* should be impossbile */ 107178064Sume nd6log((LOG_DEBUG, 107278064Sume "icmp6_notify_error: in6_embedscope failed\n")); 107378064Sume goto freeit; 107478064Sume } 107578064Sume#endif 107678064Sume 107778064Sume /* 107878064Sume * retrieve parameters from the inner IPv6 header, and convert 107978064Sume * them into sockaddr structures. 108078064Sume */ 108178064Sume bzero(&icmp6src, sizeof(icmp6src)); 108278064Sume icmp6src.sin6_len = sizeof(struct sockaddr_in6); 108378064Sume icmp6src.sin6_family = AF_INET6; 108478064Sume icmp6src.sin6_addr = eip6->ip6_src; 108578064Sume icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 108678064Sume &icmp6src.sin6_addr); 108778064Sume#ifndef SCOPEDROUTING 108878064Sume if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src, 108978064Sume NULL, NULL)) { 109078064Sume /* should be impossbile */ 109178064Sume nd6log((LOG_DEBUG, 109278064Sume "icmp6_notify_error: in6_embedscope failed\n")); 109378064Sume goto freeit; 109478064Sume } 109578064Sume#endif 1096120891Sume icmp6src.sin6_flowinfo = (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 109778064Sume 109878064Sume if (finaldst == NULL) 109978064Sume finaldst = &eip6->ip6_dst; 110078064Sume ip6cp.ip6c_m = m; 110178064Sume ip6cp.ip6c_icmp6 = icmp6; 110278064Sume ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 110378064Sume ip6cp.ip6c_off = eoff; 110478064Sume ip6cp.ip6c_finaldst = finaldst; 110578064Sume ip6cp.ip6c_src = &icmp6src; 110678064Sume ip6cp.ip6c_nxt = nxt; 110778064Sume 110862587Sitojun if (icmp6type == ICMP6_PACKET_TOO_BIG) { 110978064Sume notifymtu = ntohl(icmp6->icmp6_mtu); 111078064Sume ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 111178064Sume icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/ 111262587Sitojun } 111362587Sitojun 111453541Sshin ctlfunc = (void (*) __P((int, struct sockaddr *, void *))) 1115120891Sume (inet6sw[ip6_protox[nxt]].pr_ctlinput); 111653541Sshin if (ctlfunc) { 111778064Sume (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, 1118120891Sume &ip6cp); 111953541Sshin } 112053541Sshin } 1121120856Sume return (0); 112253541Sshin 112378064Sume freeit: 112453541Sshin m_freem(m); 1125120856Sume return (-1); 112653541Sshin} 112753541Sshin 112878064Sumevoid 112978064Sumeicmp6_mtudisc_update(ip6cp, validated) 113078064Sume struct ip6ctlparam *ip6cp; 113178064Sume int validated; 113262587Sitojun{ 113378064Sume struct in6_addr *dst = ip6cp->ip6c_finaldst; 113478064Sume struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 113578064Sume struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 113662587Sitojun u_int mtu = ntohl(icmp6->icmp6_mtu); 113762587Sitojun struct rtentry *rt = NULL; 113862587Sitojun struct sockaddr_in6 sin6; 113962587Sitojun 114078064Sume if (!validated) 114178064Sume return; 114278064Sume 114362587Sitojun bzero(&sin6, sizeof(sin6)); 114462587Sitojun sin6.sin6_family = PF_INET6; 114562587Sitojun sin6.sin6_len = sizeof(struct sockaddr_in6); 114662587Sitojun sin6.sin6_addr = *dst; 114778064Sume /* XXX normally, this won't happen */ 114878064Sume if (IN6_IS_ADDR_LINKLOCAL(dst)) { 114978064Sume sin6.sin6_addr.s6_addr16[1] = 115078064Sume htons(m->m_pkthdr.rcvif->if_index); 115178064Sume } 115262587Sitojun /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 115362587Sitojun rt = rtalloc1((struct sockaddr *)&sin6, 0, 115462587Sitojun RTF_CLONING | RTF_PRCLONING); 115562587Sitojun 1156120891Sume if (rt && (rt->rt_flags & RTF_HOST) && 1157120891Sume !(rt->rt_rmx.rmx_locks & RTV_MTU)) { 115862587Sitojun if (mtu < IPV6_MMTU) { 115962587Sitojun /* xxx */ 116062587Sitojun rt->rt_rmx.rmx_locks |= RTV_MTU; 116162587Sitojun } else if (mtu < rt->rt_ifp->if_mtu && 116262587Sitojun rt->rt_rmx.rmx_mtu > mtu) { 116378064Sume icmp6stat.icp6s_pmtuchg++; 116462587Sitojun rt->rt_rmx.rmx_mtu = mtu; 116562587Sitojun } 116662587Sitojun } 1167120727Ssam if (rt) 1168120727Ssam rtfree(rt); 116962587Sitojun} 117062587Sitojun 117153541Sshin/* 117278064Sume * Process a Node Information Query packet, based on 117378064Sume * draft-ietf-ipngwg-icmp-name-lookups-07. 1174120891Sume * 117562587Sitojun * Spec incompatibilities: 117662587Sitojun * - IPv6 Subject address handling 117762587Sitojun * - IPv4 Subject address handling support missing 117862587Sitojun * - Proxy reply (answer even if it's not for me) 117962587Sitojun * - joins NI group address at in6_ifattach() time only, does not cope 118062587Sitojun * with hostname changes by sethostname(3) 118153541Sshin */ 118262587Sitojun#define hostnamelen strlen(hostname) 118353541Sshinstatic struct mbuf * 118453541Sshinni6_input(m, off) 118553541Sshin struct mbuf *m; 118653541Sshin int off; 118753541Sshin{ 118862587Sitojun struct icmp6_nodeinfo *ni6, *nni6; 118953541Sshin struct mbuf *n = NULL; 119062587Sitojun u_int16_t qtype; 119162587Sitojun int subjlen; 119253541Sshin int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 119353541Sshin struct ni_reply_fqdn *fqdn; 119453541Sshin int addrs; /* for NI_QTYPE_NODEADDR */ 119553541Sshin struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 119678064Sume struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */ 119778064Sume struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */ 119862587Sitojun struct ip6_hdr *ip6; 119962587Sitojun int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 120078064Sume char *subj = NULL; 120178064Sume struct in6_ifaddr *ia6 = NULL; 120253541Sshin 120362587Sitojun ip6 = mtod(m, struct ip6_hdr *); 120462587Sitojun#ifndef PULLDOWN_TEST 120562587Sitojun ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 120662587Sitojun#else 120762587Sitojun IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 120862587Sitojun if (ni6 == NULL) { 120962587Sitojun /* m is already reclaimed */ 1210120891Sume return (NULL); 121162587Sitojun } 121262587Sitojun#endif 121353541Sshin 121462587Sitojun /* 121562587Sitojun * Validate IPv6 destination address. 121662587Sitojun * 121778064Sume * The Responder must discard the Query without further processing 121878064Sume * unless it is one of the Responder's unicast or anycast addresses, or 121978064Sume * a link-local scope multicast address which the Responder has joined. 122078064Sume * [icmp-name-lookups-07, Section 4.] 122162587Sitojun */ 122262587Sitojun bzero(&sin6, sizeof(sin6)); 122362587Sitojun sin6.sin6_family = AF_INET6; 122462587Sitojun sin6.sin6_len = sizeof(struct sockaddr_in6); 122562587Sitojun bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 122662587Sitojun /* XXX scopeid */ 122778064Sume if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) { 122878064Sume /* unicast/anycast, fine */ 122978064Sume if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 123078064Sume (icmp6_nodeinfo & 4) == 0) { 123178064Sume nd6log((LOG_DEBUG, "ni6_input: ignore node info to " 123278064Sume "a temporary address in %s:%d", 123378064Sume __FILE__, __LINE__)); 123478064Sume goto bad; 123578064Sume } 123678064Sume } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 123778064Sume ; /* link-local multicast, fine */ 123862587Sitojun else 123962587Sitojun goto bad; 124062587Sitojun 124178064Sume /* validate query Subject field. */ 124262587Sitojun qtype = ntohs(ni6->ni_qtype); 124362587Sitojun subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 124462587Sitojun switch (qtype) { 124562587Sitojun case NI_QTYPE_NOOP: 124662587Sitojun case NI_QTYPE_SUPTYPES: 124778064Sume /* 07 draft */ 124878064Sume if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 124978064Sume break; 125078064Sume /* FALLTHROUGH */ 125162587Sitojun case NI_QTYPE_FQDN: 125262587Sitojun case NI_QTYPE_NODEADDR: 125362587Sitojun switch (ni6->ni_code) { 125462587Sitojun case ICMP6_NI_SUBJ_IPV6: 125562587Sitojun#if ICMP6_NI_SUBJ_IPV6 != 0 125662587Sitojun case 0: 125762587Sitojun#endif 125862587Sitojun /* 125962587Sitojun * backward compatibility - try to accept 03 draft 126062587Sitojun * format, where no Subject is present. 126162587Sitojun */ 126278064Sume if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 126378064Sume subjlen == 0) { 126462587Sitojun oldfqdn++; 126562587Sitojun break; 126662587Sitojun } 126778064Sume#if ICMP6_NI_SUBJ_IPV6 != 0 126878064Sume if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 126978064Sume goto bad; 127078064Sume#endif 127162587Sitojun 127262587Sitojun if (subjlen != sizeof(sin6.sin6_addr)) 127362587Sitojun goto bad; 127462587Sitojun 127562587Sitojun /* 127662587Sitojun * Validate Subject address. 127762587Sitojun * 127878064Sume * Not sure what exactly "address belongs to the node" 127978064Sume * means in the spec, is it just unicast, or what? 128062587Sitojun * 128162587Sitojun * At this moment we consider Subject address as 128262587Sitojun * "belong to the node" if the Subject address equals 128362587Sitojun * to the IPv6 destination address; validation for 128462587Sitojun * IPv6 destination address should have done enough 128562587Sitojun * check for us. 128662587Sitojun * 128762587Sitojun * We do not do proxy at this moment. 128862587Sitojun */ 128962587Sitojun /* m_pulldown instead of copy? */ 129062587Sitojun m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 129162587Sitojun subjlen, (caddr_t)&sin6.sin6_addr); 129278064Sume sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 129378064Sume &sin6.sin6_addr); 129478064Sume#ifndef SCOPEDROUTING 129578064Sume in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL); 129662587Sitojun#endif 129778064Sume bzero(&sin6_d, sizeof(sin6_d)); 129878064Sume sin6_d.sin6_family = AF_INET6; /* not used, actually */ 129978064Sume sin6_d.sin6_len = sizeof(sin6_d); /* ditto */ 130078064Sume sin6_d.sin6_addr = ip6->ip6_dst; 130178064Sume sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 130278064Sume &ip6->ip6_dst); 130378064Sume#ifndef SCOPEDROUTING 130478064Sume in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL); 130578064Sume#endif 130678064Sume subj = (char *)&sin6; 130778064Sume if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d)) 130862587Sitojun break; 130978064Sume 131062587Sitojun /* 131162587Sitojun * XXX if we are to allow other cases, we should really 131262587Sitojun * be careful about scope here. 131362587Sitojun * basically, we should disallow queries toward IPv6 1314120891Sume * destination X with subject Y, 1315120891Sume * if scope(X) > scope(Y). 131662587Sitojun * if we allow scope(X) > scope(Y), it will result in 131762587Sitojun * information leakage across scope boundary. 131862587Sitojun */ 131962587Sitojun goto bad; 132062587Sitojun 132162587Sitojun case ICMP6_NI_SUBJ_FQDN: 132262587Sitojun /* 132362587Sitojun * Validate Subject name with gethostname(3). 132462587Sitojun * 132562587Sitojun * The behavior may need some debate, since: 132662587Sitojun * - we are not sure if the node has FQDN as 132762587Sitojun * hostname (returned by gethostname(3)). 132862587Sitojun * - the code does wildcard match for truncated names. 132962587Sitojun * however, we are not sure if we want to perform 133062587Sitojun * wildcard match, if gethostname(3) side has 133162587Sitojun * truncated hostname. 133262587Sitojun */ 133362587Sitojun n = ni6_nametodns(hostname, hostnamelen, 0); 133462587Sitojun if (!n || n->m_next || n->m_len == 0) 133562587Sitojun goto bad; 133662587Sitojun IP6_EXTHDR_GET(subj, char *, m, 133762587Sitojun off + sizeof(struct icmp6_nodeinfo), subjlen); 133862587Sitojun if (subj == NULL) 133962587Sitojun goto bad; 134062587Sitojun if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1341120891Sume n->m_len)) { 134262587Sitojun goto bad; 134362587Sitojun } 134462587Sitojun m_freem(n); 134562587Sitojun n = NULL; 134662587Sitojun break; 134762587Sitojun 134878064Sume case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 134962587Sitojun default: 135062587Sitojun goto bad; 135162587Sitojun } 135262587Sitojun break; 135378064Sume } 135462587Sitojun 135578064Sume /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 135678064Sume switch (qtype) { 135778064Sume case NI_QTYPE_FQDN: 135878064Sume if ((icmp6_nodeinfo & 1) == 0) 135978064Sume goto bad; 136078064Sume break; 136178064Sume case NI_QTYPE_NODEADDR: 136278064Sume if ((icmp6_nodeinfo & 2) == 0) 136378064Sume goto bad; 136478064Sume break; 136578064Sume } 136678064Sume 136778064Sume /* guess reply length */ 136878064Sume switch (qtype) { 136978064Sume case NI_QTYPE_NOOP: 137078064Sume break; /* no reply data */ 137178064Sume case NI_QTYPE_SUPTYPES: 137278064Sume replylen += sizeof(u_int32_t); 137378064Sume break; 137478064Sume case NI_QTYPE_FQDN: 137578064Sume /* XXX will append an mbuf */ 137678064Sume replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 137778064Sume break; 137878064Sume case NI_QTYPE_NODEADDR: 137978064Sume addrs = ni6_addrs(ni6, m, &ifp, subj); 138078064Sume if ((replylen += addrs * (sizeof(struct in6_addr) + 1381120891Sume sizeof(u_int32_t))) > MCLBYTES) 138278064Sume replylen = MCLBYTES; /* XXX: will truncate pkt later */ 138378064Sume break; 138462587Sitojun default: 138578064Sume /* 138678064Sume * XXX: We must return a reply with the ICMP6 code 1387120891Sume * `unknown Qtype' in this case. However we regard the case 138878064Sume * as an FQDN query for backward compatibility. 138978064Sume * Older versions set a random value to this field, 139078064Sume * so it rarely varies in the defined qtypes. 139178064Sume * But the mechanism is not reliable... 139278064Sume * maybe we should obsolete older versions. 139378064Sume */ 139478064Sume qtype = NI_QTYPE_FQDN; 139578064Sume /* XXX will append an mbuf */ 139678064Sume replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 139778064Sume oldfqdn++; 139878064Sume break; 139962587Sitojun } 140062587Sitojun 140178064Sume /* allocate an mbuf to reply. */ 1402111119Simp MGETHDR(n, M_DONTWAIT, m->m_type); 140362587Sitojun if (n == NULL) { 140462587Sitojun m_freem(m); 1405120856Sume return (NULL); 140662587Sitojun } 1407108466Ssam M_MOVE_PKTHDR(n, m); /* just for recvif */ 140853541Sshin if (replylen > MHLEN) { 140962587Sitojun if (replylen > MCLBYTES) { 141078064Sume /* 141178064Sume * XXX: should we try to allocate more? But MCLBYTES 141278064Sume * is probably much larger than IPV6_MMTU... 141378064Sume */ 141453541Sshin goto bad; 141562587Sitojun } 1416111119Simp MCLGET(n, M_DONTWAIT); 141753541Sshin if ((n->m_flags & M_EXT) == 0) { 141853541Sshin goto bad; 141953541Sshin } 142053541Sshin } 142153541Sshin n->m_pkthdr.len = n->m_len = replylen; 142253541Sshin 142353541Sshin /* copy mbuf header and IPv6 + Node Information base headers */ 142453541Sshin bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 142553541Sshin nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 142662587Sitojun bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 142753541Sshin 142853541Sshin /* qtype dependent procedure */ 142953541Sshin switch (qtype) { 143062587Sitojun case NI_QTYPE_NOOP: 143178064Sume nni6->ni_code = ICMP6_NI_SUCCESS; 143262587Sitojun nni6->ni_flags = 0; 143362587Sitojun break; 143462587Sitojun case NI_QTYPE_SUPTYPES: 143578064Sume { 143678064Sume u_int32_t v; 143778064Sume nni6->ni_code = ICMP6_NI_SUCCESS; 143878064Sume nni6->ni_flags = htons(0x0000); /* raw bitmap */ 143978064Sume /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 144078064Sume v = (u_int32_t)htonl(0x0000000f); 144178064Sume bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 144262587Sitojun break; 144378064Sume } 144462587Sitojun case NI_QTYPE_FQDN: 144578064Sume nni6->ni_code = ICMP6_NI_SUCCESS; 144662587Sitojun fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1447120891Sume sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo)); 144862587Sitojun nni6->ni_flags = 0; /* XXX: meaningless TTL */ 144962587Sitojun fqdn->ni_fqdn_ttl = 0; /* ditto. */ 145062587Sitojun /* 145162587Sitojun * XXX do we really have FQDN in variable "hostname"? 145262587Sitojun */ 145362587Sitojun n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 145462587Sitojun if (n->m_next == NULL) 145562587Sitojun goto bad; 145662587Sitojun /* XXX we assume that n->m_next is not a chain */ 145762587Sitojun if (n->m_next->m_next != NULL) 145862587Sitojun goto bad; 145962587Sitojun n->m_pkthdr.len += n->m_next->m_len; 146062587Sitojun break; 146162587Sitojun case NI_QTYPE_NODEADDR: 146262587Sitojun { 146362587Sitojun int lenlim, copied; 146453541Sshin 146578064Sume nni6->ni_code = ICMP6_NI_SUCCESS; 146678064Sume n->m_pkthdr.len = n->m_len = 146778064Sume sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 146878064Sume lenlim = M_TRAILINGSPACE(n); 146962587Sitojun copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 147062587Sitojun /* XXX: reset mbuf length */ 147162587Sitojun n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1472120891Sume sizeof(struct icmp6_nodeinfo) + copied; 147362587Sitojun break; 147453541Sshin } 147562587Sitojun default: 147662587Sitojun break; /* XXX impossible! */ 147762587Sitojun } 147853541Sshin 147953541Sshin nni6->ni_type = ICMP6_NI_REPLY; 148062587Sitojun m_freem(m); 1481120856Sume return (n); 148253541Sshin 148353541Sshin bad: 148462587Sitojun m_freem(m); 148553541Sshin if (n) 148653541Sshin m_freem(n); 1487120856Sume return (NULL); 148853541Sshin} 148953541Sshin#undef hostnamelen 149053541Sshin 149153541Sshin/* 149262587Sitojun * make a mbuf with DNS-encoded string. no compression support. 149362587Sitojun * 149462587Sitojun * XXX names with less than 2 dots (like "foo" or "foo.section") will be 149562587Sitojun * treated as truncated name (two \0 at the end). this is a wild guess. 149662587Sitojun */ 149762587Sitojunstatic struct mbuf * 149862587Sitojunni6_nametodns(name, namelen, old) 149962587Sitojun const char *name; 150062587Sitojun int namelen; 150162587Sitojun int old; /* return pascal string if non-zero */ 150262587Sitojun{ 150362587Sitojun struct mbuf *m; 150462587Sitojun char *cp, *ep; 150562587Sitojun const char *p, *q; 150662587Sitojun int i, len, nterm; 150762587Sitojun 150862587Sitojun if (old) 150962587Sitojun len = namelen + 1; 151062587Sitojun else 151162587Sitojun len = MCLBYTES; 151262587Sitojun 151362587Sitojun /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1514111119Simp MGET(m, M_DONTWAIT, MT_DATA); 151562587Sitojun if (m && len > MLEN) { 1516111119Simp MCLGET(m, M_DONTWAIT); 151762587Sitojun if ((m->m_flags & M_EXT) == 0) 151862587Sitojun goto fail; 151962587Sitojun } 152062587Sitojun if (!m) 152162587Sitojun goto fail; 152262587Sitojun m->m_next = NULL; 152362587Sitojun 152462587Sitojun if (old) { 152562587Sitojun m->m_len = len; 152662587Sitojun *mtod(m, char *) = namelen; 152762587Sitojun bcopy(name, mtod(m, char *) + 1, namelen); 152862587Sitojun return m; 152962587Sitojun } else { 153062587Sitojun m->m_len = 0; 153162587Sitojun cp = mtod(m, char *); 153262587Sitojun ep = mtod(m, char *) + M_TRAILINGSPACE(m); 153362587Sitojun 153462587Sitojun /* if not certain about my name, return empty buffer */ 153562587Sitojun if (namelen == 0) 153662587Sitojun return m; 153762587Sitojun 153862587Sitojun /* 153962587Sitojun * guess if it looks like shortened hostname, or FQDN. 154062587Sitojun * shortened hostname needs two trailing "\0". 154162587Sitojun */ 154262587Sitojun i = 0; 154362587Sitojun for (p = name; p < name + namelen; p++) { 154462587Sitojun if (*p && *p == '.') 154562587Sitojun i++; 154662587Sitojun } 154762587Sitojun if (i < 2) 154862587Sitojun nterm = 2; 154962587Sitojun else 155062587Sitojun nterm = 1; 155162587Sitojun 155262587Sitojun p = name; 155362587Sitojun while (cp < ep && p < name + namelen) { 155462587Sitojun i = 0; 155562587Sitojun for (q = p; q < name + namelen && *q && *q != '.'; q++) 155662587Sitojun i++; 155762587Sitojun /* result does not fit into mbuf */ 155862587Sitojun if (cp + i + 1 >= ep) 155962587Sitojun goto fail; 156078704Sume /* 156178704Sume * DNS label length restriction, RFC1035 page 8. 156278704Sume * "i == 0" case is included here to avoid returning 156378704Sume * 0-length label on "foo..bar". 156478704Sume */ 156578704Sume if (i <= 0 || i >= 64) 156662587Sitojun goto fail; 156762587Sitojun *cp++ = i; 156862587Sitojun bcopy(p, cp, i); 156962587Sitojun cp += i; 157062587Sitojun p = q; 157162587Sitojun if (p < name + namelen && *p == '.') 157262587Sitojun p++; 157362587Sitojun } 157462587Sitojun /* termination */ 157562587Sitojun if (cp + nterm >= ep) 157662587Sitojun goto fail; 157762587Sitojun while (nterm-- > 0) 157862587Sitojun *cp++ = '\0'; 157962587Sitojun m->m_len = cp - mtod(m, char *); 158062587Sitojun return m; 158162587Sitojun } 158262587Sitojun 158362587Sitojun panic("should not reach here"); 158495023Ssuz /* NOTREACHED */ 158562587Sitojun 158662587Sitojun fail: 158762587Sitojun if (m) 158862587Sitojun m_freem(m); 158962587Sitojun return NULL; 159062587Sitojun} 159162587Sitojun 159262587Sitojun/* 159362587Sitojun * check if two DNS-encoded string matches. takes care of truncated 159462587Sitojun * form (with \0\0 at the end). no compression support. 159578064Sume * XXX upper/lowercase match (see RFC2065) 159662587Sitojun */ 159762587Sitojunstatic int 159862587Sitojunni6_dnsmatch(a, alen, b, blen) 159962587Sitojun const char *a; 160062587Sitojun int alen; 160162587Sitojun const char *b; 160262587Sitojun int blen; 160362587Sitojun{ 160462587Sitojun const char *a0, *b0; 160562587Sitojun int l; 160662587Sitojun 160762587Sitojun /* simplest case - need validation? */ 160862587Sitojun if (alen == blen && bcmp(a, b, alen) == 0) 160962587Sitojun return 1; 161062587Sitojun 161162587Sitojun a0 = a; 161262587Sitojun b0 = b; 161362587Sitojun 161462587Sitojun /* termination is mandatory */ 161562587Sitojun if (alen < 2 || blen < 2) 161662587Sitojun return 0; 161762587Sitojun if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 161862587Sitojun return 0; 161962587Sitojun alen--; 162062587Sitojun blen--; 162162587Sitojun 162262587Sitojun while (a - a0 < alen && b - b0 < blen) { 162362587Sitojun if (a - a0 + 1 > alen || b - b0 + 1 > blen) 162462587Sitojun return 0; 162562587Sitojun 162662587Sitojun if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 162762587Sitojun return 0; 162862587Sitojun /* we don't support compression yet */ 162962587Sitojun if (a[0] >= 64 || b[0] >= 64) 163062587Sitojun return 0; 163162587Sitojun 163262587Sitojun /* truncated case */ 163362587Sitojun if (a[0] == 0 && a - a0 == alen - 1) 163462587Sitojun return 1; 163562587Sitojun if (b[0] == 0 && b - b0 == blen - 1) 163662587Sitojun return 1; 163762587Sitojun if (a[0] == 0 || b[0] == 0) 163862587Sitojun return 0; 163962587Sitojun 164062587Sitojun if (a[0] != b[0]) 164162587Sitojun return 0; 164262587Sitojun l = a[0]; 164362587Sitojun if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 164462587Sitojun return 0; 164562587Sitojun if (bcmp(a + 1, b + 1, l) != 0) 164662587Sitojun return 0; 164762587Sitojun 164862587Sitojun a += 1 + l; 164962587Sitojun b += 1 + l; 165062587Sitojun } 165162587Sitojun 165262587Sitojun if (a - a0 == alen && b - b0 == blen) 165362587Sitojun return 1; 165462587Sitojun else 165562587Sitojun return 0; 165662587Sitojun} 165762587Sitojun 165862587Sitojun/* 165953541Sshin * calculate the number of addresses to be returned in the node info reply. 166053541Sshin */ 166153541Sshinstatic int 166278064Sumeni6_addrs(ni6, m, ifpp, subj) 166353541Sshin struct icmp6_nodeinfo *ni6; 166453541Sshin struct mbuf *m; 166553541Sshin struct ifnet **ifpp; 166678064Sume char *subj; 166753541Sshin{ 166878064Sume struct ifnet *ifp; 166978064Sume struct in6_ifaddr *ifa6; 167078064Sume struct ifaddr *ifa; 167178064Sume struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 167253541Sshin int addrs = 0, addrsofif, iffound = 0; 167378064Sume int niflags = ni6->ni_flags; 167453541Sshin 167578064Sume if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 167678064Sume switch (ni6->ni_code) { 167778064Sume case ICMP6_NI_SUBJ_IPV6: 167878064Sume if (subj == NULL) /* must be impossible... */ 1679120856Sume return (0); 168078064Sume subj_ip6 = (struct sockaddr_in6 *)subj; 168178064Sume break; 168278064Sume default: 168378064Sume /* 168478064Sume * XXX: we only support IPv6 subject address for 168578064Sume * this Qtype. 168678064Sume */ 1687120856Sume return (0); 168878064Sume } 168978064Sume } 169078064Sume 1691108172Shsu IFNET_RLOCK(); 1692120891Sume for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 169353541Sshin addrsofif = 0; 1694120891Sume TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 169553541Sshin if (ifa->ifa_addr->sa_family != AF_INET6) 169653541Sshin continue; 169753541Sshin ifa6 = (struct in6_ifaddr *)ifa; 169853541Sshin 169978064Sume if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 170078064Sume IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1701120891Sume &ifa6->ia_addr.sin6_addr)) 170253541Sshin iffound = 1; 170353541Sshin 170462587Sitojun /* 170562587Sitojun * IPv4-mapped addresses can only be returned by a 170662587Sitojun * Node Information proxy, since they represent 170762587Sitojun * addresses of IPv4-only nodes, which perforce do 170862587Sitojun * not implement this protocol. 170978064Sume * [icmp-name-lookups-07, Section 5.4] 171062587Sitojun * So we don't support NI_NODEADDR_FLAG_COMPAT in 171162587Sitojun * this function at this moment. 171262587Sitojun */ 171362587Sitojun 171453541Sshin /* What do we have to do about ::1? */ 171578064Sume switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 171678064Sume case IPV6_ADDR_SCOPE_LINKLOCAL: 171778064Sume if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 171878064Sume continue; 171953541Sshin break; 172078064Sume case IPV6_ADDR_SCOPE_SITELOCAL: 172178064Sume if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 172278064Sume continue; 172353541Sshin break; 172478064Sume case IPV6_ADDR_SCOPE_GLOBAL: 172578064Sume if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 172678064Sume continue; 172778064Sume break; 172878064Sume default: 172978064Sume continue; 173053541Sshin } 173178064Sume 173278064Sume /* 173378064Sume * check if anycast is okay. 173495023Ssuz * XXX: just experimental. not in the spec. 173578064Sume */ 173678064Sume if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 173778064Sume (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 173878064Sume continue; /* we need only unicast addresses */ 173978064Sume if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 174078064Sume (icmp6_nodeinfo & 4) == 0) { 174178064Sume continue; 174278064Sume } 174378064Sume addrsofif++; /* count the address */ 174453541Sshin } 174553541Sshin if (iffound) { 174653541Sshin *ifpp = ifp; 1747108172Shsu IFNET_RUNLOCK(); 1748120856Sume return (addrsofif); 174953541Sshin } 175053541Sshin 175153541Sshin addrs += addrsofif; 175253541Sshin } 1753108172Shsu IFNET_RUNLOCK(); 175453541Sshin 1755120856Sume return (addrs); 175653541Sshin} 175753541Sshin 175853541Sshinstatic int 175953541Sshinni6_store_addrs(ni6, nni6, ifp0, resid) 176053541Sshin struct icmp6_nodeinfo *ni6, *nni6; 176153541Sshin struct ifnet *ifp0; 176253541Sshin int resid; 176353541Sshin{ 176478064Sume struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); 176578064Sume struct in6_ifaddr *ifa6; 176678064Sume struct ifaddr *ifa; 176778064Sume struct ifnet *ifp_dep = NULL; 176878064Sume int copied = 0, allow_deprecated = 0; 176953541Sshin u_char *cp = (u_char *)(nni6 + 1); 177078064Sume int niflags = ni6->ni_flags; 177178064Sume u_int32_t ltime; 177253541Sshin 177378064Sume if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1774120856Sume return (0); /* needless to copy */ 1775120891Sume 1776108172Shsu IFNET_RLOCK(); 177778064Sume again: 1778120891Sume for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 177962587Sitojun for (ifa = ifp->if_addrlist.tqh_first; ifa; 1780120891Sume ifa = ifa->ifa_list.tqe_next) { 178153541Sshin if (ifa->ifa_addr->sa_family != AF_INET6) 178253541Sshin continue; 178353541Sshin ifa6 = (struct in6_ifaddr *)ifa; 178453541Sshin 178578064Sume if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 178678064Sume allow_deprecated == 0) { 178778064Sume /* 178878064Sume * prefererred address should be put before 178978064Sume * deprecated addresses. 179078064Sume */ 179178064Sume 179278064Sume /* record the interface for later search */ 179378064Sume if (ifp_dep == NULL) 179478064Sume ifp_dep = ifp; 179578064Sume 179678064Sume continue; 1797120891Sume } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1798120891Sume allow_deprecated != 0) 179978064Sume continue; /* we now collect deprecated addrs */ 180053541Sshin 180153541Sshin /* What do we have to do about ::1? */ 180278064Sume switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 180378064Sume case IPV6_ADDR_SCOPE_LINKLOCAL: 180478064Sume if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 180578064Sume continue; 180653541Sshin break; 180778064Sume case IPV6_ADDR_SCOPE_SITELOCAL: 180878064Sume if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 180978064Sume continue; 181053541Sshin break; 181178064Sume case IPV6_ADDR_SCOPE_GLOBAL: 181278064Sume if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 181378064Sume continue; 181478064Sume break; 181578064Sume default: 181678064Sume continue; 181753541Sshin } 181853541Sshin 181978064Sume /* 182078064Sume * check if anycast is okay. 1821120891Sume * XXX: just experimental. not in the spec. 182278064Sume */ 182378064Sume if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 182478064Sume (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 182578064Sume continue; 182678064Sume if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 182778064Sume (icmp6_nodeinfo & 4) == 0) { 182878064Sume continue; 182953541Sshin } 183078064Sume 183178064Sume /* now we can copy the address */ 183278064Sume if (resid < sizeof(struct in6_addr) + 183378064Sume sizeof(u_int32_t)) { 183478064Sume /* 183578064Sume * We give up much more copy. 183678064Sume * Set the truncate flag and return. 183778064Sume */ 1838120891Sume nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1839108172Shsu IFNET_RUNLOCK(); 1840120856Sume return (copied); 184178064Sume } 184278064Sume 184378064Sume /* 184478064Sume * Set the TTL of the address. 184578064Sume * The TTL value should be one of the following 184678064Sume * according to the specification: 184778064Sume * 184878064Sume * 1. The remaining lifetime of a DHCP lease on the 184978064Sume * address, or 185078064Sume * 2. The remaining Valid Lifetime of a prefix from 185178064Sume * which the address was derived through Stateless 185278064Sume * Autoconfiguration. 185378064Sume * 185478064Sume * Note that we currently do not support stateful 185578064Sume * address configuration by DHCPv6, so the former 185678064Sume * case can't happen. 185778064Sume */ 185878064Sume if (ifa6->ia6_lifetime.ia6t_expire == 0) 185978064Sume ltime = ND6_INFINITE_LIFETIME; 186078064Sume else { 186178064Sume if (ifa6->ia6_lifetime.ia6t_expire > 186278064Sume time_second) 186378064Sume ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second); 186478064Sume else 186578064Sume ltime = 0; 186678064Sume } 1867120891Sume 186878064Sume bcopy(<ime, cp, sizeof(u_int32_t)); 186978064Sume cp += sizeof(u_int32_t); 187078064Sume 187178064Sume /* copy the address itself */ 187278064Sume bcopy(&ifa6->ia_addr.sin6_addr, cp, 1873120891Sume sizeof(struct in6_addr)); 187478064Sume /* XXX: KAME link-local hack; remove ifindex */ 187578064Sume if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) 187678064Sume ((struct in6_addr *)cp)->s6_addr16[1] = 0; 187778064Sume cp += sizeof(struct in6_addr); 1878120891Sume 187978064Sume resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1880120891Sume copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 188153541Sshin } 188253541Sshin if (ifp0) /* we need search only on the specified IF */ 188353541Sshin break; 188453541Sshin } 188553541Sshin 188678064Sume if (allow_deprecated == 0 && ifp_dep != NULL) { 188778064Sume ifp = ifp_dep; 188878064Sume allow_deprecated = 1; 188978064Sume 189078064Sume goto again; 189178064Sume } 189278064Sume 1893108172Shsu IFNET_RUNLOCK(); 1894108172Shsu 1895120856Sume return (copied); 189653541Sshin} 189753541Sshin 189853541Sshin/* 189953541Sshin * XXX almost dup'ed code with rip6_input. 190053541Sshin */ 190153541Sshinstatic int 190253541Sshinicmp6_rip6_input(mp, off) 190353541Sshin struct mbuf **mp; 190453541Sshin int off; 190553541Sshin{ 190653541Sshin struct mbuf *m = *mp; 190778064Sume struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 190878064Sume struct in6pcb *in6p; 190953541Sshin struct in6pcb *last = NULL; 191053541Sshin struct sockaddr_in6 rip6src; 191153541Sshin struct icmp6_hdr *icmp6; 191253541Sshin struct mbuf *opts = NULL; 191353541Sshin 191462587Sitojun#ifndef PULLDOWN_TEST 191553541Sshin /* this is assumed to be safe. */ 191653541Sshin icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 191762587Sitojun#else 191862587Sitojun IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 191962587Sitojun if (icmp6 == NULL) { 192062587Sitojun /* m is already reclaimed */ 1921120891Sume return (IPPROTO_DONE); 192262587Sitojun } 192362587Sitojun#endif 192453541Sshin 192553541Sshin bzero(&rip6src, sizeof(rip6src)); 192653541Sshin rip6src.sin6_len = sizeof(struct sockaddr_in6); 192753541Sshin rip6src.sin6_family = AF_INET6; 192862587Sitojun /* KAME hack: recover scopeid */ 192962587Sitojun (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif); 193053541Sshin 1931120891Sume LIST_FOREACH(in6p, &ripcb, inp_list) { 193278064Sume if ((in6p->inp_vflag & INP_IPV6) == 0) 193353541Sshin continue; 193478064Sume#ifdef HAVE_NRL_INPCB 193578064Sume if (!(in6p->in6p_flags & INP_IPV6)) 193678064Sume continue; 193778064Sume#endif 193853541Sshin if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) 193953541Sshin continue; 194053541Sshin if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 194153541Sshin !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 194253541Sshin continue; 194353541Sshin if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 194453541Sshin !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 194553541Sshin continue; 194653541Sshin if (in6p->in6p_icmp6filt 194753541Sshin && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 194853541Sshin in6p->in6p_icmp6filt)) 194953541Sshin continue; 195053541Sshin if (last) { 195153541Sshin struct mbuf *n; 195253541Sshin if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 195353541Sshin if (last->in6p_flags & IN6P_CONTROLOPTS) 195453541Sshin ip6_savecontrol(last, &opts, ip6, n); 195553541Sshin /* strip intermediate headers */ 195653541Sshin m_adj(n, off); 195753541Sshin if (sbappendaddr(&last->in6p_socket->so_rcv, 1958120891Sume (struct sockaddr *)&rip6src, n, opts) 1959120891Sume == 0) { 196053541Sshin /* should notify about lost packet */ 196153541Sshin m_freem(n); 196278064Sume if (opts) { 196353541Sshin m_freem(opts); 196478064Sume } 196597658Stanimura } else 196653541Sshin sorwakeup(last->in6p_socket); 196753541Sshin opts = NULL; 196853541Sshin } 196953541Sshin } 197053541Sshin last = in6p; 197153541Sshin } 197253541Sshin if (last) { 197353541Sshin if (last->in6p_flags & IN6P_CONTROLOPTS) 197453541Sshin ip6_savecontrol(last, &opts, ip6, m); 197553541Sshin /* strip intermediate headers */ 197653541Sshin m_adj(m, off); 197753541Sshin if (sbappendaddr(&last->in6p_socket->so_rcv, 1978120891Sume (struct sockaddr *)&rip6src, m, opts) == 0) { 197953541Sshin m_freem(m); 198053541Sshin if (opts) 198153541Sshin m_freem(opts); 198297658Stanimura } else 198353541Sshin sorwakeup(last->in6p_socket); 198453541Sshin } else { 198553541Sshin m_freem(m); 198653541Sshin ip6stat.ip6s_delivered--; 198753541Sshin } 198853541Sshin return IPPROTO_DONE; 198953541Sshin} 199053541Sshin 199153541Sshin/* 199253541Sshin * Reflect the ip6 packet back to the source. 199362587Sitojun * OFF points to the icmp6 header, counted from the top of the mbuf. 199453541Sshin */ 199553541Sshinvoid 199653541Sshinicmp6_reflect(m, off) 199753541Sshin struct mbuf *m; 199853541Sshin size_t off; 199953541Sshin{ 200062587Sitojun struct ip6_hdr *ip6; 200153541Sshin struct icmp6_hdr *icmp6; 200253541Sshin struct in6_ifaddr *ia; 200353541Sshin struct in6_addr t, *src = 0; 200462587Sitojun int plen; 200553541Sshin int type, code; 200653541Sshin struct ifnet *outif = NULL; 200778064Sume struct sockaddr_in6 sa6_src, sa6_dst; 200853541Sshin#ifdef COMPAT_RFC1885 200953541Sshin int mtu = IPV6_MMTU; 201053541Sshin struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst; 201153541Sshin#endif 201253541Sshin 201362587Sitojun /* too short to reflect */ 201462587Sitojun if (off < sizeof(struct ip6_hdr)) { 201578064Sume nd6log((LOG_DEBUG, 201678064Sume "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 201778064Sume (u_long)off, (u_long)sizeof(struct ip6_hdr), 201878064Sume __FILE__, __LINE__)); 201962587Sitojun goto bad; 202062587Sitojun } 202162587Sitojun 202253541Sshin /* 202353541Sshin * If there are extra headers between IPv6 and ICMPv6, strip 202453541Sshin * off that header first. 202553541Sshin */ 202662587Sitojun#ifdef DIAGNOSTIC 202762587Sitojun if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 202862587Sitojun panic("assumption failed in icmp6_reflect"); 202962587Sitojun#endif 203062587Sitojun if (off > sizeof(struct ip6_hdr)) { 203162587Sitojun size_t l; 203262587Sitojun struct ip6_hdr nip6; 203353541Sshin 203462587Sitojun l = off - sizeof(struct ip6_hdr); 203562587Sitojun m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 203662587Sitojun m_adj(m, l); 203762587Sitojun l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 203862587Sitojun if (m->m_len < l) { 203962587Sitojun if ((m = m_pullup(m, l)) == NULL) 204062587Sitojun return; 204153541Sshin } 204262587Sitojun bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 204362587Sitojun } else /* off == sizeof(struct ip6_hdr) */ { 204462587Sitojun size_t l; 204562587Sitojun l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 204662587Sitojun if (m->m_len < l) { 204762587Sitojun if ((m = m_pullup(m, l)) == NULL) 204862587Sitojun return; 204953541Sshin } 205053541Sshin } 205162587Sitojun plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 205262587Sitojun ip6 = mtod(m, struct ip6_hdr *); 205362587Sitojun ip6->ip6_nxt = IPPROTO_ICMPV6; 205453541Sshin icmp6 = (struct icmp6_hdr *)(ip6 + 1); 205553541Sshin type = icmp6->icmp6_type; /* keep type for statistics */ 205653541Sshin code = icmp6->icmp6_code; /* ditto. */ 205753541Sshin 205853541Sshin t = ip6->ip6_dst; 205953541Sshin /* 206053541Sshin * ip6_input() drops a packet if its src is multicast. 206153541Sshin * So, the src is never multicast. 206253541Sshin */ 206353541Sshin ip6->ip6_dst = ip6->ip6_src; 206453541Sshin 206578064Sume /* 206678064Sume * XXX: make sure to embed scope zone information, using 206778064Sume * already embedded IDs or the received interface (if any). 206878064Sume * Note that rcvif may be NULL. 206978064Sume * TODO: scoped routing case (XXX). 207078064Sume */ 207178064Sume bzero(&sa6_src, sizeof(sa6_src)); 207278064Sume sa6_src.sin6_family = AF_INET6; 207378064Sume sa6_src.sin6_len = sizeof(sa6_src); 207478064Sume sa6_src.sin6_addr = ip6->ip6_dst; 207578064Sume in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif); 207678064Sume in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL); 207778064Sume bzero(&sa6_dst, sizeof(sa6_dst)); 207878064Sume sa6_dst.sin6_family = AF_INET6; 207978064Sume sa6_dst.sin6_len = sizeof(sa6_dst); 208078064Sume sa6_dst.sin6_addr = t; 208178064Sume in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif); 208278064Sume in6_embedscope(&t, &sa6_dst, NULL, NULL); 208353541Sshin 208453541Sshin#ifdef COMPAT_RFC1885 208553541Sshin /* 208653541Sshin * xxx guess MTU 208753541Sshin * RFC 1885 requires that echo reply should be truncated if it 208853541Sshin * does not fit in with (return) path MTU, but the description was 208953541Sshin * removed in the new spec. 209053541Sshin */ 209153541Sshin if (icmp6_reflect_rt.ro_rt == 0 || 209253541Sshin ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) { 209353541Sshin if (icmp6_reflect_rt.ro_rt) { 209453541Sshin RTFREE(icmp6_reflect_rt.ro_rt); 209553541Sshin icmp6_reflect_rt.ro_rt = 0; 209653541Sshin } 209753541Sshin bzero(sin6, sizeof(*sin6)); 209853541Sshin sin6->sin6_family = PF_INET6; 209953541Sshin sin6->sin6_len = sizeof(struct sockaddr_in6); 210053541Sshin sin6->sin6_addr = ip6->ip6_dst; 210153541Sshin 210253541Sshin rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt, 210353541Sshin RTF_PRCLONING); 210453541Sshin } 210553541Sshin 210653541Sshin if (icmp6_reflect_rt.ro_rt == 0) 210753541Sshin goto bad; 210853541Sshin 210953541Sshin if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST) 211053541Sshin && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu) 211153541Sshin mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu; 211253541Sshin 211353541Sshin if (mtu < m->m_pkthdr.len) { 211453541Sshin plen -= (m->m_pkthdr.len - mtu); 211553541Sshin m_adj(m, mtu - m->m_pkthdr.len); 211653541Sshin } 211753541Sshin#endif 211853541Sshin /* 2119120891Sume * If the incoming packet was addressed directly to us (i.e. unicast), 212053541Sshin * use dst as the src for the reply. 2121120891Sume * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 212262587Sitojun * (for example) when we encounter an error while forwarding procedure 212362587Sitojun * destined to a duplicated address of ours. 212453541Sshin */ 212553541Sshin for (ia = in6_ifaddr; ia; ia = ia->ia_next) 212653541Sshin if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 212762587Sitojun (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 212853541Sshin src = &t; 212953541Sshin break; 213053541Sshin } 213153541Sshin if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 213253541Sshin /* 213353541Sshin * This is the case if the dst is our link-local address 213495023Ssuz * and the sender is also ourselves. 213553541Sshin */ 213653541Sshin src = &t; 213753541Sshin } 213853541Sshin 213978064Sume if (src == 0) { 214078064Sume int e; 214178064Sume struct route_in6 ro; 214278064Sume 214353541Sshin /* 214462587Sitojun * This case matches to multicasts, our anycast, or unicasts 214595023Ssuz * that we do not own. Select a source address based on the 214678064Sume * source address of the erroneous packet. 214753541Sshin */ 214878064Sume bzero(&ro, sizeof(ro)); 214978064Sume src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e); 215078064Sume if (ro.ro_rt) 215178064Sume RTFREE(ro.ro_rt); /* XXX: we could use this */ 215278064Sume if (src == NULL) { 215378064Sume nd6log((LOG_DEBUG, 215478064Sume "icmp6_reflect: source can't be determined: " 215578064Sume "dst=%s, error=%d\n", 215678064Sume ip6_sprintf(&sa6_src.sin6_addr), e)); 215778064Sume goto bad; 215878064Sume } 215978064Sume } 216053541Sshin 216153541Sshin ip6->ip6_src = *src; 216253541Sshin 216353541Sshin ip6->ip6_flow = 0; 216462587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 216562587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 216653541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 216753541Sshin if (m->m_pkthdr.rcvif) { 216853541Sshin /* XXX: This may not be the outgoing interface */ 216953541Sshin ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim; 217078064Sume } else 217178064Sume ip6->ip6_hlim = ip6_defhlim; 217253541Sshin 217353541Sshin icmp6->icmp6_cksum = 0; 217453541Sshin icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2175120891Sume sizeof(struct ip6_hdr), plen); 217653541Sshin 217753541Sshin /* 217878064Sume * XXX option handling 217953541Sshin */ 218053541Sshin 218153541Sshin m->m_flags &= ~(M_BCAST|M_MCAST); 218253541Sshin 218353541Sshin#ifdef COMPAT_RFC1885 2184105194Ssam ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL); 218553541Sshin#else 2186105194Ssam ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 218753541Sshin#endif 218853541Sshin if (outif) 218953541Sshin icmp6_ifoutstat_inc(outif, type, code); 219053541Sshin 219153541Sshin return; 219253541Sshin 219353541Sshin bad: 219453541Sshin m_freem(m); 219553541Sshin return; 219653541Sshin} 219753541Sshin 219853541Sshinvoid 219953541Sshinicmp6_fasttimo() 220053541Sshin{ 220162587Sitojun 220253541Sshin mld6_fasttimeo(); 220353541Sshin} 220453541Sshin 220553541Sshinstatic const char * 220653541Sshinicmp6_redirect_diag(src6, dst6, tgt6) 220753541Sshin struct in6_addr *src6; 220853541Sshin struct in6_addr *dst6; 220953541Sshin struct in6_addr *tgt6; 221053541Sshin{ 221153541Sshin static char buf[1024]; 221253541Sshin snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2213120891Sume ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 221453541Sshin return buf; 221553541Sshin} 221653541Sshin 221753541Sshinvoid 221853541Sshinicmp6_redirect_input(m, off) 221978064Sume struct mbuf *m; 222053541Sshin int off; 222153541Sshin{ 222253541Sshin struct ifnet *ifp = m->m_pkthdr.rcvif; 222353541Sshin struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 222462587Sitojun struct nd_redirect *nd_rd; 222553541Sshin int icmp6len = ntohs(ip6->ip6_plen); 222653541Sshin char *lladdr = NULL; 222753541Sshin int lladdrlen = 0; 222853541Sshin u_char *redirhdr = NULL; 222953541Sshin int redirhdrlen = 0; 223053541Sshin struct rtentry *rt = NULL; 223153541Sshin int is_router; 223253541Sshin int is_onlink; 223353541Sshin struct in6_addr src6 = ip6->ip6_src; 223462587Sitojun struct in6_addr redtgt6; 223562587Sitojun struct in6_addr reddst6; 223653541Sshin union nd_opts ndopts; 223753541Sshin 223853541Sshin if (!m || !ifp) 223953541Sshin return; 224053541Sshin 224153541Sshin /* XXX if we are router, we don't update route by icmp6 redirect */ 224253541Sshin if (ip6_forwarding) 224362587Sitojun goto freeit; 224453541Sshin if (!icmp6_rediraccept) 224562587Sitojun goto freeit; 224662587Sitojun 224762587Sitojun#ifndef PULLDOWN_TEST 224862587Sitojun IP6_EXTHDR_CHECK(m, off, icmp6len,); 224962587Sitojun nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 225062587Sitojun#else 225162587Sitojun IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 225262587Sitojun if (nd_rd == NULL) { 225362587Sitojun icmp6stat.icp6s_tooshort++; 225453541Sshin return; 225562587Sitojun } 225662587Sitojun#endif 225762587Sitojun redtgt6 = nd_rd->nd_rd_target; 225862587Sitojun reddst6 = nd_rd->nd_rd_dst; 225953541Sshin 226053541Sshin if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 226153541Sshin redtgt6.s6_addr16[1] = htons(ifp->if_index); 226253541Sshin if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 226353541Sshin reddst6.s6_addr16[1] = htons(ifp->if_index); 226453541Sshin 226553541Sshin /* validation */ 226653541Sshin if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 226778064Sume nd6log((LOG_ERR, 2268120891Sume "ICMP6 redirect sent from %s rejected; " 2269120891Sume "must be from linklocal\n", 2270120891Sume ip6_sprintf(&src6))); 227178064Sume goto bad; 227253541Sshin } 227353541Sshin if (ip6->ip6_hlim != 255) { 227478064Sume nd6log((LOG_ERR, 2275120891Sume "ICMP6 redirect sent from %s rejected; " 2276120891Sume "hlim=%d (must be 255)\n", 2277120891Sume ip6_sprintf(&src6), ip6->ip6_hlim)); 227878064Sume goto bad; 227953541Sshin } 228053541Sshin { 228153541Sshin /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 228253541Sshin struct sockaddr_in6 sin6; 228353541Sshin struct in6_addr *gw6; 228453541Sshin 228553541Sshin bzero(&sin6, sizeof(sin6)); 228653541Sshin sin6.sin6_family = AF_INET6; 228753541Sshin sin6.sin6_len = sizeof(struct sockaddr_in6); 228853541Sshin bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 228953541Sshin rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 229053541Sshin if (rt) { 229165895Sume if (rt->rt_gateway == NULL || 229265895Sume rt->rt_gateway->sa_family != AF_INET6) { 229378064Sume nd6log((LOG_ERR, 229465895Sume "ICMP6 redirect rejected; no route " 229565895Sume "with inet6 gateway found for redirect dst: %s\n", 229678064Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2297120727Ssam RTFREE_LOCKED(rt); 229878064Sume goto bad; 229965895Sume } 230065895Sume 230153541Sshin gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 230253541Sshin if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 230378064Sume nd6log((LOG_ERR, 2304120891Sume "ICMP6 redirect rejected; " 2305120891Sume "not equal to gw-for-src=%s (must be same): " 2306120891Sume "%s\n", 2307120891Sume ip6_sprintf(gw6), 2308120891Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2309120727Ssam RTFREE_LOCKED(rt); 231078064Sume goto bad; 231153541Sshin } 231253541Sshin } else { 231378064Sume nd6log((LOG_ERR, 2314120891Sume "ICMP6 redirect rejected; " 2315120891Sume "no route found for redirect dst: %s\n", 2316120891Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 231778064Sume goto bad; 231853541Sshin } 2319120727Ssam RTFREE_LOCKED(rt); 232053541Sshin rt = NULL; 232153541Sshin } 232253541Sshin if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 232378064Sume nd6log((LOG_ERR, 2324120891Sume "ICMP6 redirect rejected; " 2325120891Sume "redirect dst must be unicast: %s\n", 2326120891Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 232778064Sume goto bad; 232853541Sshin } 232953541Sshin 233053541Sshin is_router = is_onlink = 0; 233153541Sshin if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 233253541Sshin is_router = 1; /* router case */ 233353541Sshin if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 233453541Sshin is_onlink = 1; /* on-link destination case */ 233553541Sshin if (!is_router && !is_onlink) { 233678064Sume nd6log((LOG_ERR, 2337120891Sume "ICMP6 redirect rejected; " 2338120891Sume "neither router case nor onlink case: %s\n", 2339120891Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 234078064Sume goto bad; 234153541Sshin } 234253541Sshin /* validation passed */ 234353541Sshin 234453541Sshin icmp6len -= sizeof(*nd_rd); 234553541Sshin nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 234653541Sshin if (nd6_options(&ndopts) < 0) { 234778064Sume nd6log((LOG_INFO, "icmp6_redirect_input: " 2348120891Sume "invalid ND option, rejected: %s\n", 2349120891Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 235078064Sume /* nd6_options have incremented stats */ 235162587Sitojun goto freeit; 235253541Sshin } 235353541Sshin 235453541Sshin if (ndopts.nd_opts_tgt_lladdr) { 235553541Sshin lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 235653541Sshin lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 235753541Sshin } 235853541Sshin 235953541Sshin if (ndopts.nd_opts_rh) { 236053541Sshin redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 236153541Sshin redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 236253541Sshin } 236353541Sshin 236453541Sshin if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 236578064Sume nd6log((LOG_INFO, 2366120891Sume "icmp6_redirect_input: lladdrlen mismatch for %s " 2367120891Sume "(if %d, icmp6 packet %d): %s\n", 2368120891Sume ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2369120891Sume icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 237078064Sume goto bad; 237153541Sshin } 237253541Sshin 237353541Sshin /* RFC 2461 8.3 */ 237453541Sshin nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2375120891Sume is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 237653541Sshin 237795023Ssuz if (!is_onlink) { /* better router case. perform rtredirect. */ 237853541Sshin /* perform rtredirect */ 237953541Sshin struct sockaddr_in6 sdst; 238053541Sshin struct sockaddr_in6 sgw; 238153541Sshin struct sockaddr_in6 ssrc; 238253541Sshin 238353541Sshin bzero(&sdst, sizeof(sdst)); 238453541Sshin bzero(&sgw, sizeof(sgw)); 238553541Sshin bzero(&ssrc, sizeof(ssrc)); 238653541Sshin sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 238753541Sshin sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 238853541Sshin sizeof(struct sockaddr_in6); 238953541Sshin bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 239053541Sshin bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 239153541Sshin bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 239253541Sshin rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2393120891Sume (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 2394120891Sume (struct sockaddr *)&ssrc); 239553541Sshin } 239653541Sshin /* finally update cached route in each socket via pfctlinput */ 239753541Sshin { 239853541Sshin struct sockaddr_in6 sdst; 239953541Sshin 240053541Sshin bzero(&sdst, sizeof(sdst)); 240153541Sshin sdst.sin6_family = AF_INET6; 240253541Sshin sdst.sin6_len = sizeof(struct sockaddr_in6); 240353541Sshin bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 240453541Sshin pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 240553541Sshin#ifdef IPSEC 240653541Sshin key_sa_routechange((struct sockaddr *)&sdst); 240753541Sshin#endif 240853541Sshin } 240962587Sitojun 241062587Sitojun freeit: 241162587Sitojun m_freem(m); 241278064Sume return; 241378064Sume 241478064Sume bad: 241578064Sume icmp6stat.icp6s_badredirect++; 241678064Sume m_freem(m); 241753541Sshin} 241853541Sshin 241953541Sshinvoid 242053541Sshinicmp6_redirect_output(m0, rt) 242153541Sshin struct mbuf *m0; 242253541Sshin struct rtentry *rt; 242353541Sshin{ 242453541Sshin struct ifnet *ifp; /* my outgoing interface */ 242553541Sshin struct in6_addr *ifp_ll6; 242653541Sshin struct in6_addr *router_ll6; 242753541Sshin struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 242853541Sshin struct mbuf *m = NULL; /* newly allocated one */ 242953541Sshin struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 243053541Sshin struct nd_redirect *nd_rd; 243153541Sshin size_t maxlen; 243253541Sshin u_char *p; 243353541Sshin struct ifnet *outif = NULL; 243462587Sitojun struct sockaddr_in6 src_sa; 243553541Sshin 243662587Sitojun icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 243762587Sitojun 243853541Sshin /* if we are not router, we don't send icmp6 redirect */ 243953541Sshin if (!ip6_forwarding || ip6_accept_rtadv) 244053541Sshin goto fail; 244153541Sshin 244253541Sshin /* sanity check */ 244353541Sshin if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 244453541Sshin goto fail; 244553541Sshin 244653541Sshin /* 244753541Sshin * Address check: 244853541Sshin * the source address must identify a neighbor, and 244953541Sshin * the destination address must not be a multicast address 245053541Sshin * [RFC 2461, sec 8.2] 245153541Sshin */ 245253541Sshin sip6 = mtod(m0, struct ip6_hdr *); 245362587Sitojun bzero(&src_sa, sizeof(src_sa)); 245462587Sitojun src_sa.sin6_family = AF_INET6; 245562587Sitojun src_sa.sin6_len = sizeof(src_sa); 245662587Sitojun src_sa.sin6_addr = sip6->ip6_src; 245762587Sitojun /* we don't currently use sin6_scope_id, but eventually use it */ 245862587Sitojun src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); 245962587Sitojun if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 246053541Sshin goto fail; 246153541Sshin if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 246253541Sshin goto fail; /* what should we do here? */ 246353541Sshin 246453541Sshin /* rate limit */ 246553541Sshin if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 246653541Sshin goto fail; 246753541Sshin 246853541Sshin /* 246953541Sshin * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 247053541Sshin * we almost always ask for an mbuf cluster for simplicity. 247153541Sshin * (MHLEN < IPV6_MMTU is almost always true) 247253541Sshin */ 247362587Sitojun#if IPV6_MMTU >= MCLBYTES 247462587Sitojun# error assumption failed about IPV6_MMTU and MCLBYTES 247562587Sitojun#endif 2476111119Simp MGETHDR(m, M_DONTWAIT, MT_HEADER); 247762587Sitojun if (m && IPV6_MMTU >= MHLEN) 2478111119Simp MCLGET(m, M_DONTWAIT); 247953541Sshin if (!m) 248053541Sshin goto fail; 248178064Sume m->m_pkthdr.rcvif = NULL; 248278064Sume m->m_len = 0; 248378064Sume maxlen = M_TRAILINGSPACE(m); 248453541Sshin maxlen = min(IPV6_MMTU, maxlen); 248553541Sshin /* just for safety */ 248662587Sitojun if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 248762587Sitojun ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 248853541Sshin goto fail; 248962587Sitojun } 249053541Sshin 249153541Sshin { 249253541Sshin /* get ip6 linklocal address for ifp(my outgoing interface). */ 249362587Sitojun struct in6_ifaddr *ia; 249462587Sitojun if ((ia = in6ifa_ifpforlinklocal(ifp, 249562587Sitojun IN6_IFF_NOTREADY| 249662587Sitojun IN6_IFF_ANYCAST)) == NULL) 249753541Sshin goto fail; 249853541Sshin ifp_ll6 = &ia->ia_addr.sin6_addr; 249953541Sshin } 250053541Sshin 250153541Sshin /* get ip6 linklocal address for the router. */ 250253541Sshin if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 250353541Sshin struct sockaddr_in6 *sin6; 250453541Sshin sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 250553541Sshin router_ll6 = &sin6->sin6_addr; 250653541Sshin if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 250753541Sshin router_ll6 = (struct in6_addr *)NULL; 250853541Sshin } else 250953541Sshin router_ll6 = (struct in6_addr *)NULL; 251053541Sshin 251153541Sshin /* ip6 */ 251253541Sshin ip6 = mtod(m, struct ip6_hdr *); 251353541Sshin ip6->ip6_flow = 0; 251462587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 251562587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 251653541Sshin /* ip6->ip6_plen will be set later */ 251753541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 251853541Sshin ip6->ip6_hlim = 255; 251953541Sshin /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 252053541Sshin bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 252153541Sshin bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 252253541Sshin 252353541Sshin /* ND Redirect */ 252453541Sshin nd_rd = (struct nd_redirect *)(ip6 + 1); 252553541Sshin nd_rd->nd_rd_type = ND_REDIRECT; 252653541Sshin nd_rd->nd_rd_code = 0; 252753541Sshin nd_rd->nd_rd_reserved = 0; 252853541Sshin if (rt->rt_flags & RTF_GATEWAY) { 252953541Sshin /* 253053541Sshin * nd_rd->nd_rd_target must be a link-local address in 253153541Sshin * better router cases. 253253541Sshin */ 253353541Sshin if (!router_ll6) 253453541Sshin goto fail; 253553541Sshin bcopy(router_ll6, &nd_rd->nd_rd_target, 253653541Sshin sizeof(nd_rd->nd_rd_target)); 253753541Sshin bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 253853541Sshin sizeof(nd_rd->nd_rd_dst)); 253953541Sshin } else { 254053541Sshin /* make sure redtgt == reddst */ 254153541Sshin bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 254253541Sshin sizeof(nd_rd->nd_rd_target)); 254353541Sshin bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 254453541Sshin sizeof(nd_rd->nd_rd_dst)); 254553541Sshin } 254653541Sshin 254753541Sshin p = (u_char *)(nd_rd + 1); 254853541Sshin 254953541Sshin if (!router_ll6) 255053541Sshin goto nolladdropt; 255153541Sshin 255253541Sshin { 255353541Sshin /* target lladdr option */ 255453541Sshin struct rtentry *rt_router = NULL; 255553541Sshin int len; 255653541Sshin struct sockaddr_dl *sdl; 255753541Sshin struct nd_opt_hdr *nd_opt; 255853541Sshin char *lladdr; 255953541Sshin 256053541Sshin rt_router = nd6_lookup(router_ll6, 0, ifp); 256153541Sshin if (!rt_router) 256253541Sshin goto nolladdropt; 256362587Sitojun len = sizeof(*nd_opt) + ifp->if_addrlen; 256495023Ssuz len = (len + 7) & ~7; /* round by 8 */ 256562587Sitojun /* safety check */ 256662587Sitojun if (len + (p - (u_char *)ip6) > maxlen) 256762587Sitojun goto nolladdropt; 256862587Sitojun if (!(rt_router->rt_flags & RTF_GATEWAY) && 256962587Sitojun (rt_router->rt_flags & RTF_LLINFO) && 257062587Sitojun (rt_router->rt_gateway->sa_family == AF_LINK) && 257162587Sitojun (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) && 257262587Sitojun sdl->sdl_alen) { 257353541Sshin nd_opt = (struct nd_opt_hdr *)p; 257453541Sshin nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 257553541Sshin nd_opt->nd_opt_len = len >> 3; 257653541Sshin lladdr = (char *)(nd_opt + 1); 257753541Sshin bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 257862587Sitojun p += len; 257953541Sshin } 258053541Sshin } 258153541Sshinnolladdropt:; 258253541Sshin 258353541Sshin m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 258453541Sshin 258553541Sshin /* just to be safe */ 258662587Sitojun#ifdef M_DECRYPTED /*not openbsd*/ 258753541Sshin if (m0->m_flags & M_DECRYPTED) 258853541Sshin goto noredhdropt; 258962587Sitojun#endif 259062587Sitojun if (p - (u_char *)ip6 > maxlen) 259162587Sitojun goto noredhdropt; 259253541Sshin 2593120891Sume { 2594120891Sume /* redirected header option */ 2595120891Sume int len; 2596120891Sume struct nd_opt_rd_hdr *nd_opt_rh; 259753541Sshin 2598120891Sume /* 2599120891Sume * compute the maximum size for icmp6 redirect header option. 2600120891Sume * XXX room for auth header? 2601120891Sume */ 2602120891Sume len = maxlen - (p - (u_char *)ip6); 2603120891Sume len &= ~7; 260453541Sshin 2605120891Sume /* This is just for simplicity. */ 2606120891Sume if (m0->m_pkthdr.len != m0->m_len) { 2607120891Sume if (m0->m_next) { 2608120891Sume m_freem(m0->m_next); 2609120891Sume m0->m_next = NULL; 2610120891Sume } 2611120891Sume m0->m_pkthdr.len = m0->m_len; 261253541Sshin } 261353541Sshin 2614120891Sume /* 2615120891Sume * Redirected header option spec (RFC2461 4.6.3) talks nothing 2616120891Sume * about padding/truncate rule for the original IP packet. 2617120891Sume * From the discussion on IPv6imp in Feb 1999, 2618120891Sume * the consensus was: 2619120891Sume * - "attach as much as possible" is the goal 2620120891Sume * - pad if not aligned (original size can be guessed by 2621120891Sume * original ip6 header) 2622120891Sume * Following code adds the padding if it is simple enough, 2623120891Sume * and truncates if not. 2624120891Sume */ 2625120891Sume if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 2626120891Sume panic("assumption failed in %s:%d", __FILE__, 2627120891Sume __LINE__); 262853541Sshin 2629120891Sume if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2630120891Sume /* not enough room, truncate */ 2631120891Sume m0->m_pkthdr.len = m0->m_len = len - 2632120891Sume sizeof(*nd_opt_rh); 2633120891Sume } else { 2634120891Sume /* enough room, pad or truncate */ 2635120891Sume size_t extra; 263653541Sshin 2637120891Sume extra = m0->m_pkthdr.len % 8; 2638120891Sume if (extra) { 2639120891Sume /* pad if easy enough, truncate if not */ 2640120891Sume if (8 - extra <= M_TRAILINGSPACE(m0)) { 2641120891Sume /* pad */ 2642120891Sume m0->m_len += (8 - extra); 2643120891Sume m0->m_pkthdr.len += (8 - extra); 2644120891Sume } else { 2645120891Sume /* truncate */ 2646120891Sume m0->m_pkthdr.len -= extra; 2647120891Sume m0->m_len -= extra; 2648120891Sume } 264953541Sshin } 2650120891Sume len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2651120891Sume m0->m_pkthdr.len = m0->m_len = len - 2652120891Sume sizeof(*nd_opt_rh); 265353541Sshin } 265453541Sshin 2655120891Sume nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2656120891Sume bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2657120891Sume nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2658120891Sume nd_opt_rh->nd_opt_rh_len = len >> 3; 2659120891Sume p += sizeof(*nd_opt_rh); 2660120891Sume m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 266153541Sshin 2662120891Sume /* connect m0 to m */ 2663120891Sume m_tag_delete_chain(m0, NULL); 2664120891Sume m0->m_flags &= ~M_PKTHDR; 2665120891Sume m->m_next = m0; 2666120891Sume m->m_pkthdr.len = m->m_len + m0->m_len; 2667120891Sume m0 = NULL; 2668120891Sume } 266953541Sshinnoredhdropt:; 2670112781Ssuz if (m0) { 2671112781Ssuz m_freem(m0); 2672112781Ssuz m0 = NULL; 2673112781Ssuz } 267453541Sshin 267553541Sshin if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src)) 267653541Sshin sip6->ip6_src.s6_addr16[1] = 0; 267753541Sshin if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst)) 267853541Sshin sip6->ip6_dst.s6_addr16[1] = 0; 267962587Sitojun#if 0 268062587Sitojun if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 268162587Sitojun ip6->ip6_src.s6_addr16[1] = 0; 268262587Sitojun if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 268362587Sitojun ip6->ip6_dst.s6_addr16[1] = 0; 268462587Sitojun#endif 268553541Sshin if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target)) 268653541Sshin nd_rd->nd_rd_target.s6_addr16[1] = 0; 268753541Sshin if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst)) 268853541Sshin nd_rd->nd_rd_dst.s6_addr16[1] = 0; 268953541Sshin 269053541Sshin ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 269153541Sshin 269253541Sshin nd_rd->nd_rd_cksum = 0; 2693120891Sume nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2694120891Sume sizeof(*ip6), ntohs(ip6->ip6_plen)); 269553541Sshin 269653541Sshin /* send the packet to outside... */ 2697105194Ssam ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 269853541Sshin if (outif) { 269953541Sshin icmp6_ifstat_inc(outif, ifs6_out_msg); 270053541Sshin icmp6_ifstat_inc(outif, ifs6_out_redirect); 270153541Sshin } 270253541Sshin icmp6stat.icp6s_outhist[ND_REDIRECT]++; 270353541Sshin 270453541Sshin return; 270553541Sshin 270653541Sshinfail: 270753541Sshin if (m) 270853541Sshin m_freem(m); 270953541Sshin if (m0) 271053541Sshin m_freem(m0); 271153541Sshin} 271253541Sshin 271378064Sume#ifdef HAVE_NRL_INPCB 271478064Sume#define sotoin6pcb sotoinpcb 271578064Sume#define in6pcb inpcb 271678064Sume#define in6p_icmp6filt inp_icmp6filt 271778064Sume#endif 271853541Sshin/* 271953541Sshin * ICMPv6 socket option processing. 272053541Sshin */ 272153541Sshinint 272253541Sshinicmp6_ctloutput(so, sopt) 272353541Sshin struct socket *so; 272453541Sshin struct sockopt *sopt; 272553541Sshin{ 272653541Sshin int error = 0; 272753541Sshin int optlen; 272878064Sume struct inpcb *inp = sotoinpcb(so); 272953541Sshin int level, op, optname; 273053541Sshin 273153541Sshin if (sopt) { 273253541Sshin level = sopt->sopt_level; 273353541Sshin op = sopt->sopt_dir; 273453541Sshin optname = sopt->sopt_name; 273553541Sshin optlen = sopt->sopt_valsize; 273653541Sshin } else 273753541Sshin level = op = optname = optlen = 0; 273878064Sume 273953541Sshin if (level != IPPROTO_ICMPV6) { 274053541Sshin return EINVAL; 274153541Sshin } 274253541Sshin 274378064Sume switch (op) { 274453541Sshin case PRCO_SETOPT: 274553541Sshin switch (optname) { 274653541Sshin case ICMP6_FILTER: 274753541Sshin { 274853541Sshin struct icmp6_filter *p; 274953541Sshin 275053541Sshin if (optlen != sizeof(*p)) { 275153541Sshin error = EMSGSIZE; 275253541Sshin break; 275353541Sshin } 275453541Sshin if (inp->in6p_icmp6filt == NULL) { 275553541Sshin error = EINVAL; 275653541Sshin break; 275753541Sshin } 275853541Sshin error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen, 275953541Sshin optlen); 276053541Sshin break; 276153541Sshin } 276253541Sshin 276353541Sshin default: 276453541Sshin error = ENOPROTOOPT; 276553541Sshin break; 276653541Sshin } 276753541Sshin break; 276853541Sshin 276953541Sshin case PRCO_GETOPT: 277053541Sshin switch (optname) { 277153541Sshin case ICMP6_FILTER: 277253541Sshin { 277353541Sshin if (inp->in6p_icmp6filt == NULL) { 277453541Sshin error = EINVAL; 277553541Sshin break; 277653541Sshin } 277753541Sshin error = sooptcopyout(sopt, inp->in6p_icmp6filt, 277853541Sshin sizeof(struct icmp6_filter)); 277953541Sshin break; 278053541Sshin } 278153541Sshin 278253541Sshin default: 278353541Sshin error = ENOPROTOOPT; 278453541Sshin break; 278553541Sshin } 278653541Sshin break; 278753541Sshin } 278853541Sshin 2789120856Sume return (error); 279053541Sshin} 279178064Sume#ifdef HAVE_NRL_INPCB 279278064Sume#undef sotoin6pcb 279378064Sume#undef in6pcb 279478064Sume#undef in6p_icmp6filt 279578064Sume#endif 279653541Sshin 279778064Sume#ifndef HAVE_PPSRATECHECK 279878064Sume#ifndef timersub 279978064Sume#define timersub(tvp, uvp, vvp) \ 280078064Sume do { \ 280178064Sume (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \ 280278064Sume (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \ 280378064Sume if ((vvp)->tv_usec < 0) { \ 280478064Sume (vvp)->tv_sec--; \ 280578064Sume (vvp)->tv_usec += 1000000; \ 280678064Sume } \ 280778064Sume } while (0) 280878064Sume#endif 280978064Sume 281053541Sshin/* 281178064Sume * ppsratecheck(): packets (or events) per second limitation. 281262587Sitojun */ 281362587Sitojunstatic int 281478064Sumeppsratecheck(lasttime, curpps, maxpps) 281578064Sume struct timeval *lasttime; 281678064Sume int *curpps; 281778064Sume int maxpps; /* maximum pps allowed */ 281862587Sitojun{ 281978064Sume struct timeval tv, delta; 282078064Sume int s, rv; 282162587Sitojun 282278064Sume s = splclock(); 282378064Sume microtime(&tv); 282478064Sume splx(s); 282562587Sitojun 282678064Sume timersub(&tv, lasttime, &delta); 282762587Sitojun 282878064Sume /* 282995023Ssuz * Check for 0,0 so that the message will be seen at least once. 283095023Ssuz * If more than one second has passed since the last update of 283178064Sume * lasttime, reset the counter. 283278064Sume * 283395023Ssuz * We do increment *curpps even in *curpps < maxpps case, as some may 283478064Sume * try to use *curpps for stat purposes as well. 283578064Sume */ 283678064Sume if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) || 283778064Sume delta.tv_sec >= 1) { 283878064Sume *lasttime = tv; 283978064Sume *curpps = 0; 284078064Sume rv = 1; 284178064Sume } else if (maxpps < 0) 284278064Sume rv = 1; 284378064Sume else if (*curpps < maxpps) 284478064Sume rv = 1; 284578064Sume else 284678064Sume rv = 0; 284762587Sitojun 284895023Ssuz#if 1 /* DIAGNOSTIC? */ 284978064Sume /* be careful about wrap-around */ 285078064Sume if (*curpps + 1 > *curpps) 285178064Sume *curpps = *curpps + 1; 285278064Sume#else 285378064Sume /* 285478064Sume * assume that there's not too many calls to this function. 285578064Sume * not sure if the assumption holds, as it depends on *caller's* 285678064Sume * behavior, not the behavior of this function. 285778064Sume * IMHO it is wrong to make assumption on the caller's behavior, 285878064Sume * so the above #if is #if 1, not #ifdef DIAGNOSTIC. 285978064Sume */ 286078064Sume *curpps = *curpps + 1; 286178064Sume#endif 286278064Sume 286378064Sume return (rv); 286462587Sitojun} 286562587Sitojun#endif 286662587Sitojun 286762587Sitojun/* 286853541Sshin * Perform rate limit check. 286953541Sshin * Returns 0 if it is okay to send the icmp6 packet. 287053541Sshin * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 287153541Sshin * limitation. 287253541Sshin * 287353541Sshin * XXX per-destination/type check necessary? 287453541Sshin */ 287553541Sshinstatic int 287653541Sshinicmp6_ratelimit(dst, type, code) 287753541Sshin const struct in6_addr *dst; /* not used at this moment */ 287853541Sshin const int type; /* not used at this moment */ 287953541Sshin const int code; /* not used at this moment */ 288053541Sshin{ 288162587Sitojun int ret; 288253541Sshin 288395023Ssuz ret = 0; /* okay to send */ 288453541Sshin 288562587Sitojun /* PPS limit */ 288678064Sume if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 288778064Sume icmp6errppslim)) { 288853541Sshin /* The packet is subject to rate limit */ 288962587Sitojun ret++; 289053541Sshin } 289153541Sshin 289262587Sitojun return ret; 289353541Sshin} 2894