nd6_nbr.c revision 216022
1139826Simp/*- 253541Sshin * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 353541Sshin * All rights reserved. 453541Sshin * 553541Sshin * Redistribution and use in source and binary forms, with or without 653541Sshin * modification, are permitted provided that the following conditions 753541Sshin * are met: 853541Sshin * 1. Redistributions of source code must retain the above copyright 953541Sshin * notice, this list of conditions and the following disclaimer. 1053541Sshin * 2. Redistributions in binary form must reproduce the above copyright 1153541Sshin * notice, this list of conditions and the following disclaimer in the 1253541Sshin * documentation and/or other materials provided with the distribution. 1353541Sshin * 3. Neither the name of the project nor the names of its contributors 1453541Sshin * may be used to endorse or promote products derived from this software 1553541Sshin * without specific prior written permission. 1653541Sshin * 1753541Sshin * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 1853541Sshin * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1953541Sshin * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2053541Sshin * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2153541Sshin * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2253541Sshin * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2353541Sshin * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2453541Sshin * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2553541Sshin * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2653541Sshin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2753541Sshin * SUCH DAMAGE. 28174510Sobrien * 29174510Sobrien * $KAME: nd6_nbr.c,v 1.86 2002/01/21 02:33:04 jinmei Exp $ 3053541Sshin */ 3153541Sshin 32174510Sobrien#include <sys/cdefs.h> 33174510Sobrien__FBSDID("$FreeBSD: head/sys/netinet6/nd6_nbr.c 216022 2010-11-29 00:04:08Z bz $"); 34174510Sobrien 3562587Sitojun#include "opt_inet.h" 3662587Sitojun#include "opt_inet6.h" 37142215Sglebius#include "opt_ipsec.h" 38178167Sqingli#include "opt_mpath.h" 3955009Sshin 4053541Sshin#include <sys/param.h> 4153541Sshin#include <sys/systm.h> 4253541Sshin#include <sys/malloc.h> 43186119Sqingli#include <sys/lock.h> 44186119Sqingli#include <sys/rwlock.h> 4553541Sshin#include <sys/mbuf.h> 4653541Sshin#include <sys/socket.h> 4753541Sshin#include <sys/sockio.h> 4853541Sshin#include <sys/time.h> 4953541Sshin#include <sys/kernel.h> 5053541Sshin#include <sys/errno.h> 5153541Sshin#include <sys/syslog.h> 5253541Sshin#include <sys/queue.h> 5378064Sume#include <sys/callout.h> 5453541Sshin 5553541Sshin#include <net/if.h> 5653541Sshin#include <net/if_types.h> 5753541Sshin#include <net/if_dl.h> 58147306Sbrooks#include <net/if_var.h> 5953541Sshin#include <net/route.h> 60178167Sqingli#ifdef RADIX_MPATH 61178167Sqingli#include <net/radix_mpath.h> 62178167Sqingli#endif 6353541Sshin 6453541Sshin#include <netinet/in.h> 6553541Sshin#include <netinet/in_var.h> 66186119Sqingli#include <net/if_llatbl.h> 67186119Sqingli#define L3_ADDR_SIN6(le) ((struct sockaddr_in6 *) L3_ADDR(le)) 6853541Sshin#include <netinet6/in6_var.h> 69151477Ssuz#include <netinet6/in6_ifattach.h> 7062587Sitojun#include <netinet/ip6.h> 7153541Sshin#include <netinet6/ip6_var.h> 72148385Sume#include <netinet6/scope6_var.h> 7353541Sshin#include <netinet6/nd6.h> 7462587Sitojun#include <netinet/icmp6.h> 75211193Swill#include <netinet/ip_carp.h> 76211501Sanchie#include <netinet6/send.h> 7753541Sshin 7862587Sitojun#define SDL(s) ((struct sockaddr_dl *)s) 7953541Sshin 8062587Sitojunstruct dadq; 81175162Sobrienstatic struct dadq *nd6_dad_find(struct ifaddr *); 82175162Sobrienstatic void nd6_dad_starttimer(struct dadq *, int); 83175162Sobrienstatic void nd6_dad_stoptimer(struct dadq *); 84191816Szecstatic void nd6_dad_timer(struct dadq *); 85175162Sobrienstatic void nd6_dad_ns_output(struct dadq *, struct ifaddr *); 86175162Sobrienstatic void nd6_dad_ns_input(struct ifaddr *); 87175162Sobrienstatic void nd6_dad_na_input(struct ifaddr *); 8853541Sshin 89207369SbzVNET_DEFINE(int, dad_ignore_ns) = 0; /* ignore NS in DAD - specwise incorrect*/ 90207369SbzVNET_DEFINE(int, dad_maxtry) = 15; /* max # of *tries* to transmit DAD packet */ 91195727Srwatson#define V_dad_ignore_ns VNET(dad_ignore_ns) 92195727Srwatson#define V_dad_maxtry VNET(dad_maxtry) 93195699Srwatson 9453541Sshin/* 95108470Sschweikh * Input a Neighbor Solicitation Message. 9653541Sshin * 9753541Sshin * Based on RFC 2461 98148987Sume * Based on RFC 2462 (duplicate address detection) 9953541Sshin */ 10053541Sshinvoid 101171259Sdelphijnd6_ns_input(struct mbuf *m, int off, int icmp6len) 10253541Sshin{ 10353541Sshin struct ifnet *ifp = m->m_pkthdr.rcvif; 10453541Sshin struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 10562587Sitojun struct nd_neighbor_solicit *nd_ns; 10653541Sshin struct in6_addr saddr6 = ip6->ip6_src; 10753541Sshin struct in6_addr daddr6 = ip6->ip6_dst; 10862587Sitojun struct in6_addr taddr6; 10953541Sshin struct in6_addr myaddr6; 11053541Sshin char *lladdr = NULL; 111142215Sglebius struct ifaddr *ifa = NULL; 11253541Sshin int lladdrlen = 0; 11353541Sshin int anycast = 0, proxy = 0, tentative = 0; 11453541Sshin int tlladdr; 11553541Sshin union nd_opts ndopts; 11662587Sitojun struct sockaddr_dl *proxydl = NULL; 117165118Sbz char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 11853541Sshin 11978064Sume#ifndef PULLDOWN_TEST 12078064Sume IP6_EXTHDR_CHECK(m, off, icmp6len,); 12178064Sume nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off); 12278064Sume#else 12378064Sume IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len); 12478064Sume if (nd_ns == NULL) { 125190964Srwatson ICMP6STAT_INC(icp6s_tooshort); 12678064Sume return; 12778064Sume } 12878064Sume#endif 12978064Sume ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */ 13078064Sume taddr6 = nd_ns->nd_ns_target; 131148385Sume if (in6_setscope(&taddr6, ifp, NULL) != 0) 132148385Sume goto bad; 13378064Sume 13453541Sshin if (ip6->ip6_hlim != 255) { 13578064Sume nd6log((LOG_ERR, 13678064Sume "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n", 137165118Sbz ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 138165118Sbz ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 13978064Sume goto bad; 14053541Sshin } 14153541Sshin 14253541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 143148987Sume /* dst has to be a solicited node multicast address. */ 144120941Sume if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL && 14595023Ssuz /* don't check ifindex portion */ 146120941Sume daddr6.s6_addr32[1] == 0 && 147120941Sume daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE && 148120941Sume daddr6.s6_addr8[12] == 0xff) { 14995023Ssuz ; /* good */ 15053541Sshin } else { 15178064Sume nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 152120941Sume "(wrong ip6 dst)\n")); 15353541Sshin goto bad; 15453541Sshin } 155185348Szec } else if (!V_nd6_onlink_ns_rfc4861) { 156183529Scperciva struct sockaddr_in6 src_sa6; 157183529Scperciva 158183529Scperciva /* 159183529Scperciva * According to recent IETF discussions, it is not a good idea 160183529Scperciva * to accept a NS from an address which would not be deemed 161183529Scperciva * to be a neighbor otherwise. This point is expected to be 162183529Scperciva * clarified in future revisions of the specification. 163183529Scperciva */ 164183529Scperciva bzero(&src_sa6, sizeof(src_sa6)); 165183529Scperciva src_sa6.sin6_family = AF_INET6; 166183529Scperciva src_sa6.sin6_len = sizeof(src_sa6); 167183529Scperciva src_sa6.sin6_addr = saddr6; 168186119Sqingli if (nd6_is_addr_neighbor(&src_sa6, ifp) == 0) { 169183529Scperciva nd6log((LOG_INFO, "nd6_ns_input: " 170183529Scperciva "NS packet from non-neighbor\n")); 171183529Scperciva goto bad; 172183529Scperciva } 17353541Sshin } 17453541Sshin 17553541Sshin if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 17678064Sume nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n")); 17753541Sshin goto bad; 17853541Sshin } 17953541Sshin 18053541Sshin icmp6len -= sizeof(*nd_ns); 18153541Sshin nd6_option_init(nd_ns + 1, icmp6len, &ndopts); 18253541Sshin if (nd6_options(&ndopts) < 0) { 18378064Sume nd6log((LOG_INFO, 18478064Sume "nd6_ns_input: invalid ND option, ignored\n")); 18578064Sume /* nd6_options have incremented stats */ 18678064Sume goto freeit; 18753541Sshin } 18853541Sshin 18953541Sshin if (ndopts.nd_opts_src_lladdr) { 19095023Ssuz lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 19153541Sshin lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 19253541Sshin } 193120941Sume 19453541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) { 19578064Sume nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 19678064Sume "(link-layer address option)\n")); 19753541Sshin goto bad; 19853541Sshin } 19953541Sshin 20053541Sshin /* 20153541Sshin * Attaching target link-layer address to the NA? 20253541Sshin * (RFC 2461 7.2.4) 20353541Sshin * 20453541Sshin * NS IP dst is unicast/anycast MUST NOT add 20553541Sshin * NS IP dst is solicited-node multicast MUST add 20653541Sshin * 20753541Sshin * In implementation, we add target link-layer address by default. 20853541Sshin * We do not add one in MUST NOT cases. 20953541Sshin */ 21053541Sshin if (!IN6_IS_ADDR_MULTICAST(&daddr6)) 21153541Sshin tlladdr = 0; 21253541Sshin else 21353541Sshin tlladdr = 1; 21453541Sshin 21553541Sshin /* 21653541Sshin * Target address (taddr6) must be either: 21753541Sshin * (1) Valid unicast/anycast address for my receiving interface, 21853541Sshin * (2) Unicast address for which I'm offering proxy service, or 21953541Sshin * (3) "tentative" address on which DAD is being performed. 22053541Sshin */ 22153541Sshin /* (1) and (3) check. */ 222142215Sglebius if (ifp->if_carp) 223211157Swill ifa = (*carp_iamatch6_p)(ifp, &taddr6); 224151465Ssuz if (ifa == NULL) 225142215Sglebius ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 22653541Sshin 22753541Sshin /* (2) check. */ 228151465Ssuz if (ifa == NULL) { 22953541Sshin struct rtentry *rt; 23053541Sshin struct sockaddr_in6 tsin6; 231121765Ssam int need_proxy; 232178167Sqingli#ifdef RADIX_MPATH 233178167Sqingli struct route_in6 ro; 234178167Sqingli#endif 23553541Sshin 236171260Sdelphij bzero(&tsin6, sizeof tsin6); 23753541Sshin tsin6.sin6_len = sizeof(struct sockaddr_in6); 23853541Sshin tsin6.sin6_family = AF_INET6; 23953541Sshin tsin6.sin6_addr = taddr6; 24053541Sshin 241178167Sqingli#ifdef RADIX_MPATH 242178167Sqingli bzero(&ro, sizeof(ro)); 243178167Sqingli ro.ro_dst = tsin6; 244178167Sqingli rtalloc_mpath((struct route *)&ro, RTF_ANNOUNCE); 245178167Sqingli rt = ro.ro_rt; 246178167Sqingli#else 24753541Sshin rt = rtalloc1((struct sockaddr *)&tsin6, 0, 0); 248178167Sqingli#endif 249121765Ssam need_proxy = (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 && 250121765Ssam rt->rt_gateway->sa_family == AF_LINK); 251121765Ssam if (rt) 252187946Sbz RTFREE_LOCKED(rt); 253121765Ssam if (need_proxy) { 25453541Sshin /* 25562587Sitojun * proxy NDP for single entry 25653541Sshin */ 25762587Sitojun ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 25862587Sitojun IN6_IFF_NOTREADY|IN6_IFF_ANYCAST); 25962587Sitojun if (ifa) { 26053541Sshin proxy = 1; 26162587Sitojun proxydl = SDL(rt->rt_gateway); 26262587Sitojun } 26353541Sshin } 26453541Sshin } 265151479Ssuz if (ifa == NULL) { 26653541Sshin /* 26778064Sume * We've got an NS packet, and we don't have that adddress 26853541Sshin * assigned for us. We MUST silently ignore it. 26953541Sshin * See RFC2461 7.2.3. 27053541Sshin */ 27162587Sitojun goto freeit; 27253541Sshin } 27353541Sshin myaddr6 = *IFA_IN6(ifa); 27453541Sshin anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST; 27553541Sshin tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE; 27653541Sshin if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED) 27762587Sitojun goto freeit; 27853541Sshin 27953541Sshin if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 280120941Sume nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s " 28153541Sshin "(if %d, NS packet %d)\n", 282165118Sbz ip6_sprintf(ip6bufs, &taddr6), 283120941Sume ifp->if_addrlen, lladdrlen - 2)); 28478064Sume goto bad; 28553541Sshin } 28653541Sshin 28753541Sshin if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) { 288120941Sume nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n", 289165118Sbz ip6_sprintf(ip6bufs, &saddr6))); 29062587Sitojun goto freeit; 29153541Sshin } 29253541Sshin 29353541Sshin /* 29453541Sshin * We have neighbor solicitation packet, with target address equals to 29553541Sshin * one of my tentative address. 29653541Sshin * 29753541Sshin * src addr how to process? 29853541Sshin * --- --- 29953541Sshin * multicast of course, invalid (rejected in ip6_input) 30053541Sshin * unicast somebody is doing address resolution -> ignore 30153541Sshin * unspec dup address detection 30253541Sshin * 30353541Sshin * The processing is defined in RFC 2462. 30453541Sshin */ 30553541Sshin if (tentative) { 30653541Sshin /* 30753541Sshin * If source address is unspecified address, it is for 308148987Sume * duplicate address detection. 30953541Sshin * 31053541Sshin * If not, the packet is for addess resolution; 31153541Sshin * silently ignore it. 31253541Sshin */ 31353541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 31453541Sshin nd6_dad_ns_input(ifa); 31553541Sshin 31662587Sitojun goto freeit; 31753541Sshin } 31853541Sshin 31953541Sshin /* 32053541Sshin * If the source address is unspecified address, entries must not 32153541Sshin * be created or updated. 32253541Sshin * It looks that sender is performing DAD. Output NA toward 32353541Sshin * all-node multicast address, to tell the sender that I'm using 32453541Sshin * the address. 32553541Sshin * S bit ("solicited") must be zero. 32653541Sshin */ 32753541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 328148385Sume struct in6_addr in6_all; 329148385Sume 330148385Sume in6_all = in6addr_linklocal_allnodes; 331148385Sume if (in6_setscope(&in6_all, ifp, NULL) != 0) 332148385Sume goto bad; 333148385Sume nd6_na_output(ifp, &in6_all, &taddr6, 334120941Sume ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 335181803Sbz (V_ip6_forwarding ? ND_NA_FLAG_ROUTER : 0), 336120941Sume tlladdr, (struct sockaddr *)proxydl); 33762587Sitojun goto freeit; 33853541Sshin } 33953541Sshin 340120941Sume nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, 341120941Sume ND_NEIGHBOR_SOLICIT, 0); 34253541Sshin 34353541Sshin nd6_na_output(ifp, &saddr6, &taddr6, 344120941Sume ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 345181803Sbz (V_ip6_forwarding ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED, 346120941Sume tlladdr, (struct sockaddr *)proxydl); 34762587Sitojun freeit: 348194760Srwatson if (ifa != NULL) 349194760Srwatson ifa_free(ifa); 35062587Sitojun m_freem(m); 35153541Sshin return; 35253541Sshin 35353541Sshin bad: 354165118Sbz nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", 355165118Sbz ip6_sprintf(ip6bufs, &saddr6))); 356165118Sbz nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", 357165118Sbz ip6_sprintf(ip6bufs, &daddr6))); 358165118Sbz nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", 359165118Sbz ip6_sprintf(ip6bufs, &taddr6))); 360190964Srwatson ICMP6STAT_INC(icp6s_badns); 361194760Srwatson if (ifa != NULL) 362194760Srwatson ifa_free(ifa); 36362587Sitojun m_freem(m); 36453541Sshin} 36553541Sshin 36653541Sshin/* 367108470Sschweikh * Output a Neighbor Solicitation Message. Caller specifies: 36853541Sshin * - ICMP6 header source IP6 address 36953541Sshin * - ND6 header target IP6 address 37053541Sshin * - ND6 header source datalink address 37153541Sshin * 37253541Sshin * Based on RFC 2461 373148987Sume * Based on RFC 2462 (duplicate address detection) 374171259Sdelphij * 375171259Sdelphij * ln - for source address determination 376171259Sdelphij * dad - duplicate address detection 37753541Sshin */ 37853541Sshinvoid 379186119Sqinglind6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6, 380186119Sqingli const struct in6_addr *taddr6, struct llentry *ln, int dad) 38153541Sshin{ 38253541Sshin struct mbuf *m; 383211501Sanchie struct m_tag *mtag; 38453541Sshin struct ip6_hdr *ip6; 38553541Sshin struct nd_neighbor_solicit *nd_ns; 38653541Sshin struct ip6_moptions im6o; 38753541Sshin int icmp6len; 38862587Sitojun int maxlen; 38953541Sshin caddr_t mac; 390148385Sume struct route_in6 ro; 391120941Sume 39253541Sshin if (IN6_IS_ADDR_MULTICAST(taddr6)) 39353541Sshin return; 39453541Sshin 39562587Sitojun /* estimate the size of message */ 39662587Sitojun maxlen = sizeof(*ip6) + sizeof(*nd_ns); 39762587Sitojun maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 39862587Sitojun if (max_linkhdr + maxlen >= MCLBYTES) { 39962587Sitojun#ifdef DIAGNOSTIC 40062587Sitojun printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES " 40162587Sitojun "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 40262587Sitojun#endif 40353541Sshin return; 40462587Sitojun } 40553541Sshin 406111119Simp MGETHDR(m, M_DONTWAIT, MT_DATA); 40762587Sitojun if (m && max_linkhdr + maxlen >= MHLEN) { 408111119Simp MCLGET(m, M_DONTWAIT); 40962587Sitojun if ((m->m_flags & M_EXT) == 0) { 41062587Sitojun m_free(m); 41162587Sitojun m = NULL; 41262587Sitojun } 41362587Sitojun } 41462587Sitojun if (m == NULL) 41562587Sitojun return; 41678064Sume m->m_pkthdr.rcvif = NULL; 41762587Sitojun 418215559Sbz bzero(&ro, sizeof(ro)); 419215559Sbz 42053541Sshin if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) { 42153541Sshin m->m_flags |= M_MCAST; 42253541Sshin im6o.im6o_multicast_ifp = ifp; 42353541Sshin im6o.im6o_multicast_hlim = 255; 42453541Sshin im6o.im6o_multicast_loop = 0; 42553541Sshin } 42653541Sshin 42753541Sshin icmp6len = sizeof(*nd_ns); 42853541Sshin m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len; 42995023Ssuz m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 43053541Sshin 43153541Sshin /* fill neighbor solicitation packet */ 43253541Sshin ip6 = mtod(m, struct ip6_hdr *); 43353541Sshin ip6->ip6_flow = 0; 43462587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 43562587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 43653541Sshin /* ip6->ip6_plen will be set later */ 43753541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 43853541Sshin ip6->ip6_hlim = 255; 43953541Sshin if (daddr6) 44053541Sshin ip6->ip6_dst = *daddr6; 44153541Sshin else { 44253541Sshin ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 443148385Sume ip6->ip6_dst.s6_addr16[1] = 0; 44453541Sshin ip6->ip6_dst.s6_addr32[1] = 0; 44553541Sshin ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE; 44653541Sshin ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3]; 44753541Sshin ip6->ip6_dst.s6_addr8[12] = 0xff; 448148385Sume if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 449148385Sume goto bad; 45053541Sshin } 45153541Sshin if (!dad) { 452194760Srwatson struct ifaddr *ifa; 453194760Srwatson 45453541Sshin /* 45553541Sshin * RFC2461 7.2.2: 45653541Sshin * "If the source address of the packet prompting the 45753541Sshin * solicitation is the same as one of the addresses assigned 45853541Sshin * to the outgoing interface, that address SHOULD be placed 45953541Sshin * in the IP Source Address of the outgoing solicitation. 46053541Sshin * Otherwise, any one of the addresses assigned to the 46153541Sshin * interface should be used." 46253541Sshin * 46353541Sshin * We use the source address for the prompting packet 46453541Sshin * (saddr6), if: 46553541Sshin * - saddr6 is given from the caller (by giving "ln"), and 46653541Sshin * - saddr6 belongs to the outgoing interface. 467148385Sume * Otherwise, we perform the source address selection as usual. 46853541Sshin */ 469216022Sbz struct in6_addr *hsrc; 47053541Sshin 471216022Sbz hsrc = NULL; 472216022Sbz if (ln != NULL) { 473216022Sbz LLE_RLOCK(ln); 474216022Sbz if (ln->la_hold != NULL) { 475216022Sbz struct ip6_hdr *hip6; /* hold ip6 */ 476216022Sbz 477216022Sbz /* 478216022Sbz * assuming every packet in la_hold has the same IP 479216022Sbz * header 480216022Sbz */ 481216022Sbz hip6 = mtod(ln->la_hold, struct ip6_hdr *); 482216022Sbz /* XXX pullup? */ 483216022Sbz if (sizeof(*hip6) < ln->la_hold->m_len) { 484216022Sbz ip6->ip6_src = hip6->ip6_src; 485216022Sbz hsrc = &hip6->ip6_src; 486216022Sbz } 487216022Sbz } 488216022Sbz LLE_RUNLOCK(ln); 489148385Sume } 490194760Srwatson if (hsrc && (ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, 491194760Srwatson hsrc)) != NULL) { 492216022Sbz /* ip6_src set already. */ 493194760Srwatson ifa_free(ifa); 494194760Srwatson } else { 495148385Sume int error; 496148385Sume struct sockaddr_in6 dst_sa; 497216022Sbz struct in6_addr src_in; 498148385Sume 499148385Sume bzero(&dst_sa, sizeof(dst_sa)); 500148385Sume dst_sa.sin6_family = AF_INET6; 501148385Sume dst_sa.sin6_len = sizeof(dst_sa); 502148385Sume dst_sa.sin6_addr = ip6->ip6_dst; 503148385Sume 504194777Sbz error = in6_selectsrc(&dst_sa, NULL, 505194777Sbz NULL, &ro, NULL, NULL, &src_in); 506194777Sbz if (error) { 507165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 508148385Sume nd6log((LOG_DEBUG, 509148385Sume "nd6_ns_output: source can't be " 510148385Sume "determined: dst=%s, error=%d\n", 511165118Sbz ip6_sprintf(ip6buf, &dst_sa.sin6_addr), 512165118Sbz error)); 513148385Sume goto bad; 51453541Sshin } 515216022Sbz ip6->ip6_src = src_in; 51653541Sshin } 51753541Sshin } else { 51853541Sshin /* 51953541Sshin * Source address for DAD packet must always be IPv6 52053541Sshin * unspecified address. (0::0) 521148385Sume * We actually don't have to 0-clear the address (we did it 522148385Sume * above), but we do so here explicitly to make the intention 523148385Sume * clearer. 52453541Sshin */ 525216022Sbz bzero(&ip6->ip6_src, sizeof(ip6->ip6_src)); 52653541Sshin } 52753541Sshin nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1); 52853541Sshin nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT; 52953541Sshin nd_ns->nd_ns_code = 0; 53053541Sshin nd_ns->nd_ns_reserved = 0; 53153541Sshin nd_ns->nd_ns_target = *taddr6; 532121315Sume in6_clearscope(&nd_ns->nd_ns_target); /* XXX */ 53353541Sshin 53453541Sshin /* 53553541Sshin * Add source link-layer address option. 53653541Sshin * 53753541Sshin * spec implementation 53853541Sshin * --- --- 53953541Sshin * DAD packet MUST NOT do not add the option 54053541Sshin * there's no link layer address: 54153541Sshin * impossible do not add the option 54253541Sshin * there's link layer address: 54353541Sshin * Multicast NS MUST add one add the option 54453541Sshin * Unicast NS SHOULD add one add the option 54553541Sshin */ 54653541Sshin if (!dad && (mac = nd6_ifptomac(ifp))) { 54753541Sshin int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 54853541Sshin struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); 54953541Sshin /* 8 byte alignments... */ 55053541Sshin optlen = (optlen + 7) & ~7; 551120941Sume 55253541Sshin m->m_pkthdr.len += optlen; 55353541Sshin m->m_len += optlen; 55453541Sshin icmp6len += optlen; 55553541Sshin bzero((caddr_t)nd_opt, optlen); 55653541Sshin nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; 55753541Sshin nd_opt->nd_opt_len = optlen >> 3; 55853541Sshin bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 55953541Sshin } 56053541Sshin 56153541Sshin ip6->ip6_plen = htons((u_short)icmp6len); 56253541Sshin nd_ns->nd_ns_cksum = 0; 563120941Sume nd_ns->nd_ns_cksum = 564120941Sume in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len); 56553541Sshin 566211501Sanchie if (send_sendso_input_hook != NULL) { 567211501Sanchie mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, 568211501Sanchie sizeof(unsigned short), M_NOWAIT); 569211501Sanchie if (mtag == NULL) 570211501Sanchie goto bad; 571211501Sanchie *(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type; 572211501Sanchie m_tag_prepend(m, mtag); 573211501Sanchie } 574211501Sanchie 575151536Ssuz ip6_output(m, NULL, &ro, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL, NULL); 576148385Sume icmp6_ifstat_inc(ifp, ifs6_out_msg); 577148385Sume icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit); 578190964Srwatson ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]); 579148385Sume 580148385Sume if (ro.ro_rt) { /* we don't cache this route. */ 581148385Sume RTFREE(ro.ro_rt); 58253541Sshin } 583148385Sume return; 584148385Sume 585148385Sume bad: 586148385Sume if (ro.ro_rt) { 587148385Sume RTFREE(ro.ro_rt); 588148385Sume } 589148385Sume m_freem(m); 590148385Sume return; 59153541Sshin} 59253541Sshin 59353541Sshin/* 59453541Sshin * Neighbor advertisement input handling. 59553541Sshin * 59653541Sshin * Based on RFC 2461 597148987Sume * Based on RFC 2462 (duplicate address detection) 59862587Sitojun * 59962587Sitojun * the following items are not implemented yet: 60062587Sitojun * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 60162587Sitojun * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 60253541Sshin */ 60353541Sshinvoid 604171259Sdelphijnd6_na_input(struct mbuf *m, int off, int icmp6len) 60553541Sshin{ 60653541Sshin struct ifnet *ifp = m->m_pkthdr.rcvif; 60753541Sshin struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 60862587Sitojun struct nd_neighbor_advert *nd_na; 60953541Sshin struct in6_addr daddr6 = ip6->ip6_dst; 61062587Sitojun struct in6_addr taddr6; 61162587Sitojun int flags; 61262587Sitojun int is_router; 61362587Sitojun int is_solicited; 61462587Sitojun int is_override; 61553541Sshin char *lladdr = NULL; 61653541Sshin int lladdrlen = 0; 617186468Skmacy int checklink = 0; 61853541Sshin struct ifaddr *ifa; 619186119Sqingli struct llentry *ln = NULL; 62053541Sshin union nd_opts ndopts; 621186119Sqingli struct mbuf *chain = NULL; 622211501Sanchie struct m_tag *mtag; 623186119Sqingli struct sockaddr_in6 sin6; 624165118Sbz char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 62553541Sshin 62653541Sshin if (ip6->ip6_hlim != 255) { 62778064Sume nd6log((LOG_ERR, 62878064Sume "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n", 629165118Sbz ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 630165118Sbz ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 63178064Sume goto bad; 63262587Sitojun } 63362587Sitojun 63462587Sitojun#ifndef PULLDOWN_TEST 63562587Sitojun IP6_EXTHDR_CHECK(m, off, icmp6len,); 63662587Sitojun nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off); 63762587Sitojun#else 63862587Sitojun IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len); 63962587Sitojun if (nd_na == NULL) { 640190964Srwatson ICMP6STAT_INC(icp6s_tooshort); 64153541Sshin return; 64253541Sshin } 64362587Sitojun#endif 644148385Sume 64562587Sitojun flags = nd_na->nd_na_flags_reserved; 64662587Sitojun is_router = ((flags & ND_NA_FLAG_ROUTER) != 0); 64762587Sitojun is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0); 64862587Sitojun is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0); 64953541Sshin 650148385Sume taddr6 = nd_na->nd_na_target; 651148385Sume if (in6_setscope(&taddr6, ifp, NULL)) 652150202Ssuz goto bad; /* XXX: impossible */ 65353541Sshin 65453541Sshin if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 65578064Sume nd6log((LOG_ERR, 65653541Sshin "nd6_na_input: invalid target address %s\n", 657165118Sbz ip6_sprintf(ip6bufs, &taddr6))); 65878064Sume goto bad; 65953541Sshin } 66053541Sshin if (IN6_IS_ADDR_MULTICAST(&daddr6)) 66153541Sshin if (is_solicited) { 66278064Sume nd6log((LOG_ERR, 66378064Sume "nd6_na_input: a solicited adv is multicasted\n")); 66478064Sume goto bad; 66553541Sshin } 66653541Sshin 66753541Sshin icmp6len -= sizeof(*nd_na); 66853541Sshin nd6_option_init(nd_na + 1, icmp6len, &ndopts); 66953541Sshin if (nd6_options(&ndopts) < 0) { 67078064Sume nd6log((LOG_INFO, 67178064Sume "nd6_na_input: invalid ND option, ignored\n")); 67278064Sume /* nd6_options have incremented stats */ 67362587Sitojun goto freeit; 67453541Sshin } 67553541Sshin 67653541Sshin if (ndopts.nd_opts_tgt_lladdr) { 67753541Sshin lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 67853541Sshin lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 67953541Sshin } 68053541Sshin 68153541Sshin ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 68253541Sshin 68353541Sshin /* 68453541Sshin * Target address matches one of my interface address. 68553541Sshin * 68653541Sshin * If my address is tentative, this means that there's somebody 68753541Sshin * already using the same address as mine. This indicates DAD failure. 68853541Sshin * This is defined in RFC 2462. 68953541Sshin * 69053541Sshin * Otherwise, process as defined in RFC 2461. 69153541Sshin */ 69253541Sshin if (ifa 69353541Sshin && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) { 694194760Srwatson ifa_free(ifa); 69553541Sshin nd6_dad_na_input(ifa); 69662587Sitojun goto freeit; 69753541Sshin } 69853541Sshin 69995023Ssuz /* Just for safety, maybe unnecessary. */ 70053541Sshin if (ifa) { 701194760Srwatson ifa_free(ifa); 70253541Sshin log(LOG_ERR, 70353541Sshin "nd6_na_input: duplicate IP6 address %s\n", 704165118Sbz ip6_sprintf(ip6bufs, &taddr6)); 70562587Sitojun goto freeit; 70653541Sshin } 70753541Sshin 70853541Sshin if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 709120941Sume nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s " 710165118Sbz "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6), 711120941Sume ifp->if_addrlen, lladdrlen - 2)); 71278064Sume goto bad; 71353541Sshin } 71453541Sshin 71553541Sshin /* 716120941Sume * If no neighbor cache entry is found, NA SHOULD silently be 717120941Sume * discarded. 71853541Sshin */ 719186119Sqingli IF_AFDATA_LOCK(ifp); 720186119Sqingli ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp); 721186119Sqingli IF_AFDATA_UNLOCK(ifp); 722186119Sqingli if (ln == NULL) { 72362587Sitojun goto freeit; 724186119Sqingli } 72553541Sshin 72653541Sshin if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 72753541Sshin /* 72853541Sshin * If the link-layer has address, and no lladdr option came, 72953541Sshin * discard the packet. 73053541Sshin */ 731186119Sqingli if (ifp->if_addrlen && lladdr == NULL) { 73262587Sitojun goto freeit; 733186119Sqingli } 73453541Sshin 73553541Sshin /* 73653541Sshin * Record link-layer address, and update the state. 73753541Sshin */ 738186119Sqingli bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen); 739186119Sqingli ln->la_flags |= LLE_VALID; 74053541Sshin if (is_solicited) { 74153541Sshin ln->ln_state = ND6_LLINFO_REACHABLE; 74262587Sitojun ln->ln_byhint = 0; 743151539Ssuz if (!ND6_LLINFO_PERMANENT(ln)) { 744186119Sqingli nd6_llinfo_settimer_locked(ln, 745186119Sqingli (long)ND_IFINFO(ln->lle_tbl->llt_ifp)->reachable * hz); 746120941Sume } 74778064Sume } else { 74853541Sshin ln->ln_state = ND6_LLINFO_STALE; 749186119Sqingli nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz); 75078064Sume } 75178064Sume if ((ln->ln_router = is_router) != 0) { 75278064Sume /* 75378064Sume * This means a router's state has changed from 75478064Sume * non-reachable to probably reachable, and might 75578064Sume * affect the status of associated prefixes.. 75678064Sume */ 757186468Skmacy checklink = 1; 75878064Sume } 75953541Sshin } else { 76053541Sshin int llchange; 76153541Sshin 76253541Sshin /* 76353541Sshin * Check if the link-layer address has changed or not. 76453541Sshin */ 765151465Ssuz if (lladdr == NULL) 76653541Sshin llchange = 0; 76753541Sshin else { 768186119Sqingli if (ln->la_flags & LLE_VALID) { 769186119Sqingli if (bcmp(lladdr, &ln->ll_addr, ifp->if_addrlen)) 77053541Sshin llchange = 1; 77153541Sshin else 77253541Sshin llchange = 0; 77353541Sshin } else 77453541Sshin llchange = 1; 77553541Sshin } 77653541Sshin 77753541Sshin /* 77853541Sshin * This is VERY complex. Look at it with care. 77953541Sshin * 78053541Sshin * override solicit lladdr llchange action 78153541Sshin * (L: record lladdr) 78253541Sshin * 78353541Sshin * 0 0 n -- (2c) 78453541Sshin * 0 0 y n (2b) L 78553541Sshin * 0 0 y y (1) REACHABLE->STALE 78653541Sshin * 0 1 n -- (2c) *->REACHABLE 78753541Sshin * 0 1 y n (2b) L *->REACHABLE 78853541Sshin * 0 1 y y (1) REACHABLE->STALE 78953541Sshin * 1 0 n -- (2a) 79053541Sshin * 1 0 y n (2a) L 79153541Sshin * 1 0 y y (2a) L *->STALE 79253541Sshin * 1 1 n -- (2a) *->REACHABLE 79353541Sshin * 1 1 y n (2a) L *->REACHABLE 79453541Sshin * 1 1 y y (2a) L *->REACHABLE 79553541Sshin */ 796151539Ssuz if (!is_override && (lladdr != NULL && llchange)) { /* (1) */ 79753541Sshin /* 79853541Sshin * If state is REACHABLE, make it STALE. 79953541Sshin * no other updates should be done. 80053541Sshin */ 80178064Sume if (ln->ln_state == ND6_LLINFO_REACHABLE) { 80253541Sshin ln->ln_state = ND6_LLINFO_STALE; 803186119Sqingli nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz); 80478064Sume } 80562587Sitojun goto freeit; 80653541Sshin } else if (is_override /* (2a) */ 807151465Ssuz || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */ 808151465Ssuz || lladdr == NULL) { /* (2c) */ 80953541Sshin /* 81053541Sshin * Update link-local address, if any. 81153541Sshin */ 812151465Ssuz if (lladdr != NULL) { 813186119Sqingli bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen); 814186119Sqingli ln->la_flags |= LLE_VALID; 81553541Sshin } 81653541Sshin 81753541Sshin /* 81853541Sshin * If solicited, make the state REACHABLE. 81953541Sshin * If not solicited and the link-layer address was 82053541Sshin * changed, make it STALE. 82153541Sshin */ 82253541Sshin if (is_solicited) { 82353541Sshin ln->ln_state = ND6_LLINFO_REACHABLE; 82462587Sitojun ln->ln_byhint = 0; 825151539Ssuz if (!ND6_LLINFO_PERMANENT(ln)) { 826186119Sqingli nd6_llinfo_settimer_locked(ln, 827151539Ssuz (long)ND_IFINFO(ifp)->reachable * hz); 82853541Sshin } 82953541Sshin } else { 830151465Ssuz if (lladdr != NULL && llchange) { 83153541Sshin ln->ln_state = ND6_LLINFO_STALE; 832186119Sqingli nd6_llinfo_settimer_locked(ln, 833181803Sbz (long)V_nd6_gctimer * hz); 83478064Sume } 83553541Sshin } 83653541Sshin } 83753541Sshin 83853541Sshin if (ln->ln_router && !is_router) { 83953541Sshin /* 84053541Sshin * The peer dropped the router flag. 84153541Sshin * Remove the sender from the Default Router List and 84253541Sshin * update the Destination Cache entries. 84353541Sshin */ 84453541Sshin struct nd_defrouter *dr; 84553541Sshin struct in6_addr *in6; 84653541Sshin 847186119Sqingli in6 = &L3_ADDR_SIN6(ln)->sin6_addr; 84895023Ssuz 84995023Ssuz /* 85095023Ssuz * Lock to protect the default router list. 85195023Ssuz * XXX: this might be unnecessary, since this function 85295023Ssuz * is only called under the network software interrupt 853120941Sume * context. However, we keep it just for safety. 85495023Ssuz */ 855186119Sqingli dr = defrouter_lookup(in6, ln->lle_tbl->llt_ifp); 85653541Sshin if (dr) 85753541Sshin defrtrlist_del(dr); 858181803Sbz else if (!V_ip6_forwarding) { 85953541Sshin /* 86053541Sshin * Even if the neighbor is not in the default 86153541Sshin * router list, the neighbor may be used 86253541Sshin * as a next hop for some destinations 86353541Sshin * (e.g. redirect case). So we must 86453541Sshin * call rt6_flush explicitly. 86553541Sshin */ 866128422Sluigi rt6_flush(&ip6->ip6_src, ifp); 86753541Sshin } 86853541Sshin } 86953541Sshin ln->ln_router = is_router; 87053541Sshin } 871186119Sqingli /* XXX - QL 872186119Sqingli * Does this matter? 873186119Sqingli * rt->rt_flags &= ~RTF_REJECT; 874186119Sqingli */ 875186119Sqingli ln->la_asked = 0; 876186119Sqingli if (ln->la_hold) { 877151539Ssuz struct mbuf *m_hold, *m_hold_next; 878151539Ssuz 879169273Ssuz /* 880186119Sqingli * reset the la_hold in advance, to explicitly 881186119Sqingli * prevent a la_hold lookup in nd6_output() 882169273Ssuz * (wouldn't happen, though...) 883169273Ssuz */ 884186119Sqingli for (m_hold = ln->la_hold, ln->la_hold = NULL; 885169241Ssuz m_hold; m_hold = m_hold_next) { 886151539Ssuz m_hold_next = m_hold->m_nextpkt; 887169241Ssuz m_hold->m_nextpkt = NULL; 888151539Ssuz /* 889151539Ssuz * we assume ifp is not a loopback here, so just set 890151539Ssuz * the 2nd argument as the 1st one. 891151539Ssuz */ 892211501Sanchie 893211501Sanchie if (send_sendso_input_hook != NULL) { 894211501Sanchie mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, 895211501Sanchie sizeof(unsigned short), M_NOWAIT); 896211501Sanchie if (mtag == NULL) 897211501Sanchie goto bad; 898211501Sanchie m_tag_prepend(m, mtag); 899211501Sanchie } 900211501Sanchie 901186119Sqingli nd6_output_lle(ifp, ifp, m_hold, L3_ADDR_SIN6(ln), NULL, ln, &chain); 902151539Ssuz } 90353541Sshin } 904186119Sqingli freeit: 905186160Skmacy if (ln != NULL) { 906186119Sqingli if (chain) 907186119Sqingli memcpy(&sin6, L3_ADDR_SIN6(ln), sizeof(sin6)); 908186119Sqingli LLE_WUNLOCK(ln); 90962587Sitojun 910186119Sqingli if (chain) 911186119Sqingli nd6_output_flush(ifp, ifp, chain, &sin6, NULL); 912186119Sqingli } 913186468Skmacy if (checklink) 914186468Skmacy pfxlist_onlink_check(); 915186468Skmacy 91662587Sitojun m_freem(m); 91778064Sume return; 91878064Sume 91978064Sume bad: 920186160Skmacy if (ln != NULL) 921186119Sqingli LLE_WUNLOCK(ln); 922186119Sqingli 923190964Srwatson ICMP6STAT_INC(icp6s_badna); 92478064Sume m_freem(m); 92553541Sshin} 92653541Sshin 92753541Sshin/* 92853541Sshin * Neighbor advertisement output handling. 92953541Sshin * 93053541Sshin * Based on RFC 2461 93153541Sshin * 93262587Sitojun * the following items are not implemented yet: 93362587Sitojun * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 93462587Sitojun * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 935171259Sdelphij * 936171259Sdelphij * tlladdr - 1 if include target link-layer address 937171259Sdelphij * sdl0 - sockaddr_dl (= proxy NA) or NULL 93853541Sshin */ 93953541Sshinvoid 940171259Sdelphijnd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0, 941171259Sdelphij const struct in6_addr *taddr6, u_long flags, int tlladdr, 942171259Sdelphij struct sockaddr *sdl0) 94353541Sshin{ 94453541Sshin struct mbuf *m; 945211501Sanchie struct m_tag *mtag; 94653541Sshin struct ip6_hdr *ip6; 94753541Sshin struct nd_neighbor_advert *nd_na; 94853541Sshin struct ip6_moptions im6o; 949194777Sbz struct in6_addr src, daddr6; 950148385Sume struct sockaddr_in6 dst_sa; 951148385Sume int icmp6len, maxlen, error; 95292733Speter caddr_t mac = NULL; 953148385Sume struct route_in6 ro; 95462587Sitojun 955148385Sume bzero(&ro, sizeof(ro)); 956148385Sume 957148385Sume daddr6 = *daddr6_0; /* make a local copy for modification */ 958148385Sume 95962587Sitojun /* estimate the size of message */ 96062587Sitojun maxlen = sizeof(*ip6) + sizeof(*nd_na); 96162587Sitojun maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 96262587Sitojun if (max_linkhdr + maxlen >= MCLBYTES) { 96362587Sitojun#ifdef DIAGNOSTIC 96462587Sitojun printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES " 96562587Sitojun "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 96662587Sitojun#endif 96753541Sshin return; 96862587Sitojun } 96953541Sshin 970111119Simp MGETHDR(m, M_DONTWAIT, MT_DATA); 97162587Sitojun if (m && max_linkhdr + maxlen >= MHLEN) { 972111119Simp MCLGET(m, M_DONTWAIT); 97362587Sitojun if ((m->m_flags & M_EXT) == 0) { 97462587Sitojun m_free(m); 97562587Sitojun m = NULL; 97662587Sitojun } 97762587Sitojun } 97862587Sitojun if (m == NULL) 97962587Sitojun return; 98078064Sume m->m_pkthdr.rcvif = NULL; 98162587Sitojun 982148385Sume if (IN6_IS_ADDR_MULTICAST(&daddr6)) { 98353541Sshin m->m_flags |= M_MCAST; 98453541Sshin im6o.im6o_multicast_ifp = ifp; 98553541Sshin im6o.im6o_multicast_hlim = 255; 98653541Sshin im6o.im6o_multicast_loop = 0; 98753541Sshin } 98853541Sshin 98953541Sshin icmp6len = sizeof(*nd_na); 99053541Sshin m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len; 99195023Ssuz m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 99253541Sshin 99353541Sshin /* fill neighbor advertisement packet */ 99453541Sshin ip6 = mtod(m, struct ip6_hdr *); 99553541Sshin ip6->ip6_flow = 0; 99662587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 99762587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 99853541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 99953541Sshin ip6->ip6_hlim = 255; 1000148385Sume if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) { 100153541Sshin /* reply to DAD */ 1002153227Sume daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 1003153227Sume daddr6.s6_addr16[1] = 0; 1004153227Sume daddr6.s6_addr32[1] = 0; 1005153227Sume daddr6.s6_addr32[2] = 0; 1006153227Sume daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE; 1007148385Sume if (in6_setscope(&daddr6, ifp, NULL)) 1008148385Sume goto bad; 1009148385Sume 101053541Sshin flags &= ~ND_NA_FLAG_SOLICITED; 1011148385Sume } 1012148385Sume ip6->ip6_dst = daddr6; 1013148385Sume bzero(&dst_sa, sizeof(struct sockaddr_in6)); 1014148385Sume dst_sa.sin6_family = AF_INET6; 1015148385Sume dst_sa.sin6_len = sizeof(struct sockaddr_in6); 1016148385Sume dst_sa.sin6_addr = daddr6; 101753541Sshin 101853541Sshin /* 101953541Sshin * Select a source whose scope is the same as that of the dest. 102053541Sshin */ 1021148385Sume bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa)); 1022194777Sbz error = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, NULL, &src); 1023194777Sbz if (error) { 1024165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 1025148385Sume nd6log((LOG_DEBUG, "nd6_na_output: source can't be " 1026148385Sume "determined: dst=%s, error=%d\n", 1027165118Sbz ip6_sprintf(ip6buf, &dst_sa.sin6_addr), error)); 1028148385Sume goto bad; 102953541Sshin } 1030194777Sbz ip6->ip6_src = src; 103153541Sshin nd_na = (struct nd_neighbor_advert *)(ip6 + 1); 103253541Sshin nd_na->nd_na_type = ND_NEIGHBOR_ADVERT; 103353541Sshin nd_na->nd_na_code = 0; 103453541Sshin nd_na->nd_na_target = *taddr6; 1035121315Sume in6_clearscope(&nd_na->nd_na_target); /* XXX */ 103653541Sshin 103753541Sshin /* 103853541Sshin * "tlladdr" indicates NS's condition for adding tlladdr or not. 103953541Sshin * see nd6_ns_input() for details. 104053541Sshin * Basically, if NS packet is sent to unicast/anycast addr, 104153541Sshin * target lladdr option SHOULD NOT be included. 104253541Sshin */ 104362587Sitojun if (tlladdr) { 104462587Sitojun /* 104562587Sitojun * sdl0 != NULL indicates proxy NA. If we do proxy, use 104662587Sitojun * lladdr in sdl0. If we are not proxying (sending NA for 104762587Sitojun * my address) use lladdr configured for the interface. 104862587Sitojun */ 1049142215Sglebius if (sdl0 == NULL) { 1050142215Sglebius if (ifp->if_carp) 1051211157Swill mac = (*carp_macmatch6_p)(ifp, m, taddr6); 1052142215Sglebius if (mac == NULL) 1053142215Sglebius mac = nd6_ifptomac(ifp); 1054142215Sglebius } else if (sdl0->sa_family == AF_LINK) { 105562587Sitojun struct sockaddr_dl *sdl; 105662587Sitojun sdl = (struct sockaddr_dl *)sdl0; 105762587Sitojun if (sdl->sdl_alen == ifp->if_addrlen) 105862587Sitojun mac = LLADDR(sdl); 105962587Sitojun } 106062587Sitojun } 106162587Sitojun if (tlladdr && mac) { 106253541Sshin int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 106353541Sshin struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1); 1064120941Sume 106553541Sshin /* roundup to 8 bytes alignment! */ 106653541Sshin optlen = (optlen + 7) & ~7; 106753541Sshin 106853541Sshin m->m_pkthdr.len += optlen; 106953541Sshin m->m_len += optlen; 107053541Sshin icmp6len += optlen; 107153541Sshin bzero((caddr_t)nd_opt, optlen); 107253541Sshin nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 107353541Sshin nd_opt->nd_opt_len = optlen >> 3; 107453541Sshin bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 107553541Sshin } else 107653541Sshin flags &= ~ND_NA_FLAG_OVERRIDE; 107753541Sshin 107853541Sshin ip6->ip6_plen = htons((u_short)icmp6len); 107953541Sshin nd_na->nd_na_flags_reserved = flags; 108053541Sshin nd_na->nd_na_cksum = 0; 108153541Sshin nd_na->nd_na_cksum = 1082120941Sume in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len); 108353541Sshin 1084211501Sanchie if (send_sendso_input_hook != NULL) { 1085211501Sanchie mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, 1086211501Sanchie sizeof(unsigned short), M_NOWAIT); 1087211501Sanchie if (mtag == NULL) 1088211501Sanchie goto bad; 1089211501Sanchie *(unsigned short *)(mtag + 1) = nd_na->nd_na_type; 1090211501Sanchie m_tag_prepend(m, mtag); 1091211501Sanchie } 1092211501Sanchie 1093148385Sume ip6_output(m, NULL, &ro, 0, &im6o, NULL, NULL); 1094148385Sume icmp6_ifstat_inc(ifp, ifs6_out_msg); 1095148385Sume icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert); 1096190964Srwatson ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]); 1097148385Sume 1098148385Sume if (ro.ro_rt) { /* we don't cache this route. */ 1099148385Sume RTFREE(ro.ro_rt); 110053541Sshin } 1101148385Sume return; 1102148385Sume 1103148385Sume bad: 1104148385Sume if (ro.ro_rt) { 1105148385Sume RTFREE(ro.ro_rt); 1106148385Sume } 1107148385Sume m_freem(m); 1108148385Sume return; 110953541Sshin} 111053541Sshin 111153541Sshincaddr_t 1112171259Sdelphijnd6_ifptomac(struct ifnet *ifp) 111353541Sshin{ 111453541Sshin switch (ifp->if_type) { 111553541Sshin case IFT_ARCNET: 111653541Sshin case IFT_ETHER: 111753541Sshin case IFT_FDDI: 111878064Sume case IFT_IEEE1394: 111978468Ssumikawa#ifdef IFT_L2VLAN 112078468Ssumikawa case IFT_L2VLAN: 112178468Ssumikawa#endif 112278064Sume#ifdef IFT_IEEE80211 112378064Sume case IFT_IEEE80211: 112478064Sume#endif 1125142215Sglebius#ifdef IFT_CARP 1126142215Sglebius case IFT_CARP: 1127142215Sglebius#endif 1128149829Sthompsa case IFT_BRIDGE: 1129120049Smdodd case IFT_ISO88025: 1130147306Sbrooks return IF_LLADDR(ifp); 113153541Sshin default: 113253541Sshin return NULL; 113353541Sshin } 113453541Sshin} 113553541Sshin 113653541Sshinstruct dadq { 113760938Sjake TAILQ_ENTRY(dadq) dad_list; 113853541Sshin struct ifaddr *dad_ifa; 113953541Sshin int dad_count; /* max NS to send */ 114062587Sitojun int dad_ns_tcount; /* # of trials to send NS */ 114153541Sshin int dad_ns_ocount; /* NS sent so far */ 114253541Sshin int dad_ns_icount; 114353541Sshin int dad_na_icount; 114478064Sume struct callout dad_timer_ch; 1145191816Szec struct vnet *dad_vnet; 114653541Sshin}; 114753541Sshin 1148215701Sdimstatic VNET_DEFINE(TAILQ_HEAD(, dadq), dadq); 1149207369SbzVNET_DEFINE(int, dad_init) = 0; 1150195727Srwatson#define V_dadq VNET(dadq) 1151195727Srwatson#define V_dad_init VNET(dad_init) 1152195699Srwatson 115353541Sshinstatic struct dadq * 1154171259Sdelphijnd6_dad_find(struct ifaddr *ifa) 115553541Sshin{ 115653541Sshin struct dadq *dp; 115753541Sshin 1158181803Sbz for (dp = V_dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) { 115953541Sshin if (dp->dad_ifa == ifa) 116053541Sshin return dp; 116153541Sshin } 116253541Sshin return NULL; 116353541Sshin} 116453541Sshin 116578064Sumestatic void 1166171259Sdelphijnd6_dad_starttimer(struct dadq *dp, int ticks) 116778064Sume{ 116878064Sume 116978064Sume callout_reset(&dp->dad_timer_ch, ticks, 1170191816Szec (void (*)(void *))nd6_dad_timer, (void *)dp); 117178064Sume} 117278064Sume 117378064Sumestatic void 1174171259Sdelphijnd6_dad_stoptimer(struct dadq *dp) 117578064Sume{ 117678064Sume 117778064Sume callout_stop(&dp->dad_timer_ch); 117878064Sume} 117978064Sume 118053541Sshin/* 1181148987Sume * Start Duplicate Address Detection (DAD) for specified interface address. 118253541Sshin */ 118353541Sshinvoid 1184171259Sdelphijnd6_dad_start(struct ifaddr *ifa, int delay) 118553541Sshin{ 118653541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 118753541Sshin struct dadq *dp; 1188165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 118953541Sshin 1190181803Sbz if (!V_dad_init) { 1191181803Sbz TAILQ_INIT(&V_dadq); 1192181803Sbz V_dad_init++; 119353541Sshin } 119453541Sshin 119553541Sshin /* 119653541Sshin * If we don't need DAD, don't do it. 119753541Sshin * There are several cases: 119853541Sshin * - DAD is disabled (ip6_dad_count == 0) 119953541Sshin * - the interface address is anycast 120053541Sshin */ 120153541Sshin if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) { 120262587Sitojun log(LOG_DEBUG, 120362587Sitojun "nd6_dad_start: called with non-tentative address " 120453541Sshin "%s(%s)\n", 1205165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 120653541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 120753541Sshin return; 120853541Sshin } 120953541Sshin if (ia->ia6_flags & IN6_IFF_ANYCAST) { 121053541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 121153541Sshin return; 121253541Sshin } 1213181803Sbz if (!V_ip6_dad_count) { 121453541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 121553541Sshin return; 121653541Sshin } 1217151465Ssuz if (ifa->ifa_ifp == NULL) 121853541Sshin panic("nd6_dad_start: ifa->ifa_ifp == NULL"); 1219120941Sume if (!(ifa->ifa_ifp->if_flags & IFF_UP)) { 122053541Sshin return; 1221120941Sume } 1222197138Shrs if (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED) 1223197138Shrs return; 122453541Sshin if (nd6_dad_find(ifa) != NULL) { 122553541Sshin /* DAD already in progress */ 122653541Sshin return; 122753541Sshin } 122853541Sshin 122953541Sshin dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT); 123053541Sshin if (dp == NULL) { 123162587Sitojun log(LOG_ERR, "nd6_dad_start: memory allocation failed for " 123253541Sshin "%s(%s)\n", 1233165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 123453541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 123553541Sshin return; 123653541Sshin } 123753541Sshin bzero(dp, sizeof(*dp)); 123878064Sume callout_init(&dp->dad_timer_ch, 0); 1239191816Szec#ifdef VIMAGE 1240191816Szec dp->dad_vnet = curvnet; 1241191816Szec#endif 1242182150Sjulian TAILQ_INSERT_TAIL(&V_dadq, (struct dadq *)dp, dad_list); 124353541Sshin 124478064Sume nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp), 1245165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 124653541Sshin 124753541Sshin /* 124853541Sshin * Send NS packet for DAD, ip6_dad_count times. 124953541Sshin * Note that we must delay the first transmission, if this is the 125053541Sshin * first packet to be sent from the interface after interface 125153541Sshin * (re)initialization. 125253541Sshin */ 125353541Sshin dp->dad_ifa = ifa; 1254194602Srwatson ifa_ref(ifa); /* just for safety */ 1255181803Sbz dp->dad_count = V_ip6_dad_count; 125653541Sshin dp->dad_ns_icount = dp->dad_na_icount = 0; 125762587Sitojun dp->dad_ns_ocount = dp->dad_ns_tcount = 0; 1258151539Ssuz if (delay == 0) { 125962587Sitojun nd6_dad_ns_output(dp, ifa); 1260121161Sume nd6_dad_starttimer(dp, 1261151539Ssuz (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 126253541Sshin } else { 1263151539Ssuz nd6_dad_starttimer(dp, delay); 126453541Sshin } 126553541Sshin} 126653541Sshin 126778064Sume/* 126878064Sume * terminate DAD unconditionally. used for address removals. 126978064Sume */ 127078064Sumevoid 1271171259Sdelphijnd6_dad_stop(struct ifaddr *ifa) 127278064Sume{ 127378064Sume struct dadq *dp; 127478064Sume 1275181803Sbz if (!V_dad_init) 127678064Sume return; 127778064Sume dp = nd6_dad_find(ifa); 127878064Sume if (!dp) { 127978064Sume /* DAD wasn't started yet */ 128078064Sume return; 128178064Sume } 128278064Sume 128378064Sume nd6_dad_stoptimer(dp); 128478064Sume 1285181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 128678064Sume free(dp, M_IP6NDP); 128778064Sume dp = NULL; 1288194602Srwatson ifa_free(ifa); 128978064Sume} 129078064Sume 129153541Sshinstatic void 1292191816Szecnd6_dad_timer(struct dadq *dp) 129353541Sshin{ 1294183550Szec CURVNET_SET(dp->dad_vnet); 129553541Sshin int s; 1296191816Szec struct ifaddr *ifa = dp->dad_ifa; 129753541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1298165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 129953541Sshin 130095023Ssuz s = splnet(); /* XXX */ 130153541Sshin 130253541Sshin /* Sanity check */ 130353541Sshin if (ia == NULL) { 130462587Sitojun log(LOG_ERR, "nd6_dad_timer: called with null parameter\n"); 130553541Sshin goto done; 130653541Sshin } 130753541Sshin if (ia->ia6_flags & IN6_IFF_DUPLICATED) { 130862587Sitojun log(LOG_ERR, "nd6_dad_timer: called with duplicated address " 130953541Sshin "%s(%s)\n", 1310165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 131153541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 131253541Sshin goto done; 131353541Sshin } 131453541Sshin if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) { 131562587Sitojun log(LOG_ERR, "nd6_dad_timer: called with non-tentative address " 131653541Sshin "%s(%s)\n", 1317165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 131853541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 131953541Sshin goto done; 132053541Sshin } 132153541Sshin 132262587Sitojun /* timeouted with IFF_{RUNNING,UP} check */ 1323181803Sbz if (dp->dad_ns_tcount > V_dad_maxtry) { 132478064Sume nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n", 1325120941Sume if_name(ifa->ifa_ifp))); 132662587Sitojun 1327181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 132862587Sitojun free(dp, M_IP6NDP); 132962587Sitojun dp = NULL; 1330194602Srwatson ifa_free(ifa); 133162587Sitojun goto done; 133262587Sitojun } 133362587Sitojun 133453541Sshin /* Need more checks? */ 133553541Sshin if (dp->dad_ns_ocount < dp->dad_count) { 133653541Sshin /* 133753541Sshin * We have more NS to go. Send NS packet for DAD. 133853541Sshin */ 133962587Sitojun nd6_dad_ns_output(dp, ifa); 1340120941Sume nd6_dad_starttimer(dp, 1341151539Ssuz (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 134253541Sshin } else { 134353541Sshin /* 134453541Sshin * We have transmitted sufficient number of DAD packets. 134553541Sshin * See what we've got. 134653541Sshin */ 134753541Sshin int duplicate; 134853541Sshin 134953541Sshin duplicate = 0; 135053541Sshin 135153541Sshin if (dp->dad_na_icount) { 135253541Sshin /* 135353541Sshin * the check is in nd6_dad_na_input(), 135453541Sshin * but just in case 135553541Sshin */ 135653541Sshin duplicate++; 135753541Sshin } 135853541Sshin 135953541Sshin if (dp->dad_ns_icount) { 136053541Sshin /* We've seen NS, means DAD has failed. */ 136153541Sshin duplicate++; 136253541Sshin } 136353541Sshin 136453541Sshin if (duplicate) { 136553541Sshin /* (*dp) will be freed in nd6_dad_duplicated() */ 136653541Sshin dp = NULL; 136753541Sshin nd6_dad_duplicated(ifa); 136853541Sshin } else { 136953541Sshin /* 137053541Sshin * We are done with DAD. No NA came, no NS came. 1371148987Sume * No duplicate address found. 137253541Sshin */ 137353541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 137453541Sshin 137578064Sume nd6log((LOG_DEBUG, 137662587Sitojun "%s: DAD complete for %s - no duplicates found\n", 137762587Sitojun if_name(ifa->ifa_ifp), 1378165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 137953541Sshin 1380181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 138153541Sshin free(dp, M_IP6NDP); 138253541Sshin dp = NULL; 1383194602Srwatson ifa_free(ifa); 138453541Sshin } 138553541Sshin } 138653541Sshin 138753541Sshindone: 138853541Sshin splx(s); 1389183550Szec CURVNET_RESTORE(); 139053541Sshin} 139153541Sshin 139253541Sshinvoid 1393171259Sdelphijnd6_dad_duplicated(struct ifaddr *ifa) 139453541Sshin{ 139553541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1396151477Ssuz struct ifnet *ifp; 139753541Sshin struct dadq *dp; 1398165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 139953541Sshin 140053541Sshin dp = nd6_dad_find(ifa); 140153541Sshin if (dp == NULL) { 140262587Sitojun log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n"); 140353541Sshin return; 140453541Sshin } 140553541Sshin 140678064Sume log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: " 140778064Sume "NS in/out=%d/%d, NA in=%d\n", 1408165118Sbz if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 140978064Sume dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount); 141053541Sshin 141153541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 141253541Sshin ia->ia6_flags |= IN6_IFF_DUPLICATED; 141353541Sshin 1414148987Sume /* We are done with DAD, with duplicate address found. (failure) */ 141578064Sume nd6_dad_stoptimer(dp); 141653541Sshin 1417151477Ssuz ifp = ifa->ifa_ifp; 141862587Sitojun log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n", 1419165118Sbz if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)); 142062587Sitojun log(LOG_ERR, "%s: manual intervention required\n", 1421151477Ssuz if_name(ifp)); 142253541Sshin 1423151477Ssuz /* 1424151477Ssuz * If the address is a link-local address formed from an interface 1425151477Ssuz * identifier based on the hardware address which is supposed to be 1426151477Ssuz * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP 1427151477Ssuz * operation on the interface SHOULD be disabled. 1428197138Shrs * [RFC 4862, Section 5.4.5] 1429151477Ssuz */ 1430151477Ssuz if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) { 1431151477Ssuz struct in6_addr in6; 1432151477Ssuz 1433151477Ssuz /* 1434151477Ssuz * To avoid over-reaction, we only apply this logic when we are 1435151477Ssuz * very sure that hardware addresses are supposed to be unique. 1436151477Ssuz */ 1437151477Ssuz switch (ifp->if_type) { 1438151477Ssuz case IFT_ETHER: 1439151477Ssuz case IFT_FDDI: 1440151477Ssuz case IFT_ATM: 1441151477Ssuz case IFT_IEEE1394: 1442151477Ssuz#ifdef IFT_IEEE80211 1443151477Ssuz case IFT_IEEE80211: 1444151477Ssuz#endif 1445151477Ssuz in6 = ia->ia_addr.sin6_addr; 1446151477Ssuz if (in6_get_hw_ifid(ifp, &in6) == 0 && 1447151477Ssuz IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) { 1448151477Ssuz ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED; 1449151477Ssuz log(LOG_ERR, "%s: possible hardware address " 1450151477Ssuz "duplication detected, disable IPv6\n", 1451151477Ssuz if_name(ifp)); 1452151477Ssuz } 1453151477Ssuz break; 1454151477Ssuz } 1455151477Ssuz } 1456151477Ssuz 1457181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 145853541Sshin free(dp, M_IP6NDP); 145953541Sshin dp = NULL; 1460194602Srwatson ifa_free(ifa); 146153541Sshin} 146253541Sshin 146362587Sitojunstatic void 1464171259Sdelphijnd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa) 146562587Sitojun{ 146662587Sitojun struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 146762587Sitojun struct ifnet *ifp = ifa->ifa_ifp; 146862587Sitojun 146962587Sitojun dp->dad_ns_tcount++; 147062587Sitojun if ((ifp->if_flags & IFF_UP) == 0) { 147162587Sitojun return; 147262587Sitojun } 1473148887Srwatson if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 147462587Sitojun return; 147562587Sitojun } 147662587Sitojun 147762587Sitojun dp->dad_ns_ocount++; 147862587Sitojun nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1); 147962587Sitojun} 148062587Sitojun 148162587Sitojunstatic void 1482171259Sdelphijnd6_dad_ns_input(struct ifaddr *ifa) 148353541Sshin{ 148453541Sshin struct in6_ifaddr *ia; 148553541Sshin struct ifnet *ifp; 148678064Sume const struct in6_addr *taddr6; 148753541Sshin struct dadq *dp; 148853541Sshin int duplicate; 148953541Sshin 1490151465Ssuz if (ifa == NULL) 149153541Sshin panic("ifa == NULL in nd6_dad_ns_input"); 149253541Sshin 149353541Sshin ia = (struct in6_ifaddr *)ifa; 149453541Sshin ifp = ifa->ifa_ifp; 149553541Sshin taddr6 = &ia->ia_addr.sin6_addr; 149653541Sshin duplicate = 0; 149753541Sshin dp = nd6_dad_find(ifa); 149853541Sshin 149953541Sshin /* Quickhack - completely ignore DAD NS packets */ 1500181803Sbz if (V_dad_ignore_ns) { 1501165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 150278064Sume nd6log((LOG_INFO, 150378064Sume "nd6_dad_ns_input: ignoring DAD NS packet for " 1504165118Sbz "address %s(%s)\n", ip6_sprintf(ip6buf, taddr6), 150578064Sume if_name(ifa->ifa_ifp))); 150653541Sshin return; 150753541Sshin } 150853541Sshin 150953541Sshin /* 151053541Sshin * if I'm yet to start DAD, someone else started using this address 151153541Sshin * first. I have a duplicate and you win. 151253541Sshin */ 1513151465Ssuz if (dp == NULL || dp->dad_ns_ocount == 0) 151453541Sshin duplicate++; 151553541Sshin 151653541Sshin /* XXX more checks for loopback situation - see nd6_dad_timer too */ 151753541Sshin 151853541Sshin if (duplicate) { 151953541Sshin dp = NULL; /* will be freed in nd6_dad_duplicated() */ 152053541Sshin nd6_dad_duplicated(ifa); 152153541Sshin } else { 152253541Sshin /* 152353541Sshin * not sure if I got a duplicate. 152453541Sshin * increment ns count and see what happens. 152553541Sshin */ 152653541Sshin if (dp) 152753541Sshin dp->dad_ns_icount++; 152853541Sshin } 152953541Sshin} 153053541Sshin 153162587Sitojunstatic void 1532171259Sdelphijnd6_dad_na_input(struct ifaddr *ifa) 153353541Sshin{ 153453541Sshin struct dadq *dp; 153553541Sshin 1536151465Ssuz if (ifa == NULL) 153753541Sshin panic("ifa == NULL in nd6_dad_na_input"); 153853541Sshin 153953541Sshin dp = nd6_dad_find(ifa); 154053541Sshin if (dp) 154153541Sshin dp->dad_na_icount++; 154253541Sshin 154353541Sshin /* remove the address. */ 154453541Sshin nd6_dad_duplicated(ifa); 154553541Sshin} 1546