nd6_nbr.c revision 186119
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 186119 2008-12-15 06:10:57Z qingli $"); 34174510Sobrien 3562587Sitojun#include "opt_inet.h" 3662587Sitojun#include "opt_inet6.h" 37142215Sglebius#include "opt_ipsec.h" 38142215Sglebius#include "opt_carp.h" 39178167Sqingli#include "opt_mpath.h" 4055009Sshin 4153541Sshin#include <sys/param.h> 4253541Sshin#include <sys/systm.h> 4353541Sshin#include <sys/malloc.h> 44186119Sqingli#include <sys/lock.h> 45186119Sqingli#include <sys/rwlock.h> 4653541Sshin#include <sys/mbuf.h> 4753541Sshin#include <sys/socket.h> 4853541Sshin#include <sys/sockio.h> 4953541Sshin#include <sys/time.h> 5053541Sshin#include <sys/kernel.h> 5153541Sshin#include <sys/errno.h> 5253541Sshin#include <sys/syslog.h> 5353541Sshin#include <sys/queue.h> 5478064Sume#include <sys/callout.h> 55181803Sbz#include <sys/vimage.h> 5653541Sshin 5753541Sshin#include <net/if.h> 5853541Sshin#include <net/if_types.h> 5953541Sshin#include <net/if_dl.h> 60147306Sbrooks#include <net/if_var.h> 6153541Sshin#include <net/route.h> 62178167Sqingli#ifdef RADIX_MPATH 63178167Sqingli#include <net/radix_mpath.h> 64178167Sqingli#endif 6553541Sshin 6653541Sshin#include <netinet/in.h> 6753541Sshin#include <netinet/in_var.h> 68186119Sqingli#include <net/if_llatbl.h> 69186119Sqingli#define L3_ADDR_SIN6(le) ((struct sockaddr_in6 *) L3_ADDR(le)) 7053541Sshin#include <netinet6/in6_var.h> 71151477Ssuz#include <netinet6/in6_ifattach.h> 7262587Sitojun#include <netinet/ip6.h> 7353541Sshin#include <netinet6/ip6_var.h> 74148385Sume#include <netinet6/scope6_var.h> 7553541Sshin#include <netinet6/nd6.h> 7662587Sitojun#include <netinet/icmp6.h> 77185571Sbz#include <netinet6/vinet6.h> 7853541Sshin 79142215Sglebius#ifdef DEV_CARP 80142215Sglebius#include <netinet/ip_carp.h> 81142215Sglebius#endif 82142215Sglebius 8362587Sitojun#define SDL(s) ((struct sockaddr_dl *)s) 8453541Sshin 8562587Sitojunstruct dadq; 86175162Sobrienstatic struct dadq *nd6_dad_find(struct ifaddr *); 87175162Sobrienstatic void nd6_dad_starttimer(struct dadq *, int); 88175162Sobrienstatic void nd6_dad_stoptimer(struct dadq *); 89175162Sobrienstatic void nd6_dad_timer(struct ifaddr *); 90175162Sobrienstatic void nd6_dad_ns_output(struct dadq *, struct ifaddr *); 91175162Sobrienstatic void nd6_dad_ns_input(struct ifaddr *); 92175162Sobrienstatic void nd6_dad_na_input(struct ifaddr *); 9353541Sshin 94185088Szec#ifdef VIMAGE_GLOBALS 95185088Szecint dad_ignore_ns; 96185088Szecint dad_maxtry; 97185088Szec#endif 9853541Sshin 9953541Sshin/* 100108470Sschweikh * Input a Neighbor Solicitation Message. 10153541Sshin * 10253541Sshin * Based on RFC 2461 103148987Sume * Based on RFC 2462 (duplicate address detection) 10453541Sshin */ 10553541Sshinvoid 106171259Sdelphijnd6_ns_input(struct mbuf *m, int off, int icmp6len) 10753541Sshin{ 108183550Szec INIT_VNET_INET6(curvnet); 10953541Sshin struct ifnet *ifp = m->m_pkthdr.rcvif; 11053541Sshin struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 11162587Sitojun struct nd_neighbor_solicit *nd_ns; 11253541Sshin struct in6_addr saddr6 = ip6->ip6_src; 11353541Sshin struct in6_addr daddr6 = ip6->ip6_dst; 11462587Sitojun struct in6_addr taddr6; 11553541Sshin struct in6_addr myaddr6; 11653541Sshin char *lladdr = NULL; 117142215Sglebius struct ifaddr *ifa = NULL; 11853541Sshin int lladdrlen = 0; 11953541Sshin int anycast = 0, proxy = 0, tentative = 0; 12053541Sshin int tlladdr; 12153541Sshin union nd_opts ndopts; 12262587Sitojun struct sockaddr_dl *proxydl = NULL; 123165118Sbz char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 12453541Sshin 12578064Sume#ifndef PULLDOWN_TEST 12678064Sume IP6_EXTHDR_CHECK(m, off, icmp6len,); 12778064Sume nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off); 12878064Sume#else 12978064Sume IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len); 13078064Sume if (nd_ns == NULL) { 131181803Sbz V_icmp6stat.icp6s_tooshort++; 13278064Sume return; 13378064Sume } 13478064Sume#endif 13578064Sume ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */ 13678064Sume taddr6 = nd_ns->nd_ns_target; 137148385Sume if (in6_setscope(&taddr6, ifp, NULL) != 0) 138148385Sume goto bad; 13978064Sume 14053541Sshin if (ip6->ip6_hlim != 255) { 14178064Sume nd6log((LOG_ERR, 14278064Sume "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n", 143165118Sbz ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 144165118Sbz ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 14578064Sume goto bad; 14653541Sshin } 14753541Sshin 14853541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 149148987Sume /* dst has to be a solicited node multicast address. */ 150120941Sume if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL && 15195023Ssuz /* don't check ifindex portion */ 152120941Sume daddr6.s6_addr32[1] == 0 && 153120941Sume daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE && 154120941Sume daddr6.s6_addr8[12] == 0xff) { 15595023Ssuz ; /* good */ 15653541Sshin } else { 15778064Sume nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 158120941Sume "(wrong ip6 dst)\n")); 15953541Sshin goto bad; 16053541Sshin } 161185348Szec } else if (!V_nd6_onlink_ns_rfc4861) { 162183529Scperciva struct sockaddr_in6 src_sa6; 163183529Scperciva 164183529Scperciva /* 165183529Scperciva * According to recent IETF discussions, it is not a good idea 166183529Scperciva * to accept a NS from an address which would not be deemed 167183529Scperciva * to be a neighbor otherwise. This point is expected to be 168183529Scperciva * clarified in future revisions of the specification. 169183529Scperciva */ 170183529Scperciva bzero(&src_sa6, sizeof(src_sa6)); 171183529Scperciva src_sa6.sin6_family = AF_INET6; 172183529Scperciva src_sa6.sin6_len = sizeof(src_sa6); 173183529Scperciva src_sa6.sin6_addr = saddr6; 174186119Sqingli if (nd6_is_addr_neighbor(&src_sa6, ifp) == 0) { 175183529Scperciva nd6log((LOG_INFO, "nd6_ns_input: " 176183529Scperciva "NS packet from non-neighbor\n")); 177183529Scperciva goto bad; 178183529Scperciva } 17953541Sshin } 18053541Sshin 18153541Sshin if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 18278064Sume nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n")); 18353541Sshin goto bad; 18453541Sshin } 18553541Sshin 18653541Sshin icmp6len -= sizeof(*nd_ns); 18753541Sshin nd6_option_init(nd_ns + 1, icmp6len, &ndopts); 18853541Sshin if (nd6_options(&ndopts) < 0) { 18978064Sume nd6log((LOG_INFO, 19078064Sume "nd6_ns_input: invalid ND option, ignored\n")); 19178064Sume /* nd6_options have incremented stats */ 19278064Sume goto freeit; 19353541Sshin } 19453541Sshin 19553541Sshin if (ndopts.nd_opts_src_lladdr) { 19695023Ssuz lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 19753541Sshin lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 19853541Sshin } 199120941Sume 20053541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) { 20178064Sume nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 20278064Sume "(link-layer address option)\n")); 20353541Sshin goto bad; 20453541Sshin } 20553541Sshin 20653541Sshin /* 20753541Sshin * Attaching target link-layer address to the NA? 20853541Sshin * (RFC 2461 7.2.4) 20953541Sshin * 21053541Sshin * NS IP dst is unicast/anycast MUST NOT add 21153541Sshin * NS IP dst is solicited-node multicast MUST add 21253541Sshin * 21353541Sshin * In implementation, we add target link-layer address by default. 21453541Sshin * We do not add one in MUST NOT cases. 21553541Sshin */ 21653541Sshin if (!IN6_IS_ADDR_MULTICAST(&daddr6)) 21753541Sshin tlladdr = 0; 21853541Sshin else 21953541Sshin tlladdr = 1; 22053541Sshin 22153541Sshin /* 22253541Sshin * Target address (taddr6) must be either: 22353541Sshin * (1) Valid unicast/anycast address for my receiving interface, 22453541Sshin * (2) Unicast address for which I'm offering proxy service, or 22553541Sshin * (3) "tentative" address on which DAD is being performed. 22653541Sshin */ 22753541Sshin /* (1) and (3) check. */ 228142215Sglebius#ifdef DEV_CARP 229142215Sglebius if (ifp->if_carp) 230142215Sglebius ifa = carp_iamatch6(ifp->if_carp, &taddr6); 231151465Ssuz if (ifa == NULL) 232142215Sglebius ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 233142215Sglebius#else 23453541Sshin ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 235142215Sglebius#endif 23653541Sshin 23753541Sshin /* (2) check. */ 238151465Ssuz if (ifa == NULL) { 23953541Sshin struct rtentry *rt; 24053541Sshin struct sockaddr_in6 tsin6; 241121765Ssam int need_proxy; 242178167Sqingli#ifdef RADIX_MPATH 243178167Sqingli struct route_in6 ro; 244178167Sqingli#endif 24553541Sshin 246171260Sdelphij bzero(&tsin6, sizeof tsin6); 24753541Sshin tsin6.sin6_len = sizeof(struct sockaddr_in6); 24853541Sshin tsin6.sin6_family = AF_INET6; 24953541Sshin tsin6.sin6_addr = taddr6; 25053541Sshin 251178167Sqingli#ifdef RADIX_MPATH 252178167Sqingli bzero(&ro, sizeof(ro)); 253178167Sqingli ro.ro_dst = tsin6; 254178167Sqingli rtalloc_mpath((struct route *)&ro, RTF_ANNOUNCE); 255178167Sqingli rt = ro.ro_rt; 256178167Sqingli#else 25753541Sshin rt = rtalloc1((struct sockaddr *)&tsin6, 0, 0); 258178167Sqingli#endif 259121765Ssam need_proxy = (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 && 260121765Ssam rt->rt_gateway->sa_family == AF_LINK); 261121765Ssam if (rt) 262121765Ssam rtfree(rt); 263121765Ssam if (need_proxy) { 26453541Sshin /* 26562587Sitojun * proxy NDP for single entry 26653541Sshin */ 26762587Sitojun ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 26862587Sitojun IN6_IFF_NOTREADY|IN6_IFF_ANYCAST); 26962587Sitojun if (ifa) { 27053541Sshin proxy = 1; 27162587Sitojun proxydl = SDL(rt->rt_gateway); 27262587Sitojun } 27353541Sshin } 27453541Sshin } 275151479Ssuz if (ifa == NULL) { 27653541Sshin /* 27778064Sume * We've got an NS packet, and we don't have that adddress 27853541Sshin * assigned for us. We MUST silently ignore it. 27953541Sshin * See RFC2461 7.2.3. 28053541Sshin */ 28162587Sitojun goto freeit; 28253541Sshin } 28353541Sshin myaddr6 = *IFA_IN6(ifa); 28453541Sshin anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST; 28553541Sshin tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE; 28653541Sshin if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED) 28762587Sitojun goto freeit; 28853541Sshin 28953541Sshin if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 290120941Sume nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s " 29153541Sshin "(if %d, NS packet %d)\n", 292165118Sbz ip6_sprintf(ip6bufs, &taddr6), 293120941Sume ifp->if_addrlen, lladdrlen - 2)); 29478064Sume goto bad; 29553541Sshin } 29653541Sshin 29753541Sshin if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) { 298120941Sume nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n", 299165118Sbz ip6_sprintf(ip6bufs, &saddr6))); 30062587Sitojun goto freeit; 30153541Sshin } 30253541Sshin 30353541Sshin /* 30453541Sshin * We have neighbor solicitation packet, with target address equals to 30553541Sshin * one of my tentative address. 30653541Sshin * 30753541Sshin * src addr how to process? 30853541Sshin * --- --- 30953541Sshin * multicast of course, invalid (rejected in ip6_input) 31053541Sshin * unicast somebody is doing address resolution -> ignore 31153541Sshin * unspec dup address detection 31253541Sshin * 31353541Sshin * The processing is defined in RFC 2462. 31453541Sshin */ 31553541Sshin if (tentative) { 31653541Sshin /* 31753541Sshin * If source address is unspecified address, it is for 318148987Sume * duplicate address detection. 31953541Sshin * 32053541Sshin * If not, the packet is for addess resolution; 32153541Sshin * silently ignore it. 32253541Sshin */ 32353541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 32453541Sshin nd6_dad_ns_input(ifa); 32553541Sshin 32662587Sitojun goto freeit; 32753541Sshin } 32853541Sshin 32953541Sshin /* 33053541Sshin * If the source address is unspecified address, entries must not 33153541Sshin * be created or updated. 33253541Sshin * It looks that sender is performing DAD. Output NA toward 33353541Sshin * all-node multicast address, to tell the sender that I'm using 33453541Sshin * the address. 33553541Sshin * S bit ("solicited") must be zero. 33653541Sshin */ 33753541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 338148385Sume struct in6_addr in6_all; 339148385Sume 340148385Sume in6_all = in6addr_linklocal_allnodes; 341148385Sume if (in6_setscope(&in6_all, ifp, NULL) != 0) 342148385Sume goto bad; 343148385Sume nd6_na_output(ifp, &in6_all, &taddr6, 344120941Sume ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 345181803Sbz (V_ip6_forwarding ? ND_NA_FLAG_ROUTER : 0), 346120941Sume tlladdr, (struct sockaddr *)proxydl); 34762587Sitojun goto freeit; 34853541Sshin } 34953541Sshin 350120941Sume nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, 351120941Sume ND_NEIGHBOR_SOLICIT, 0); 35253541Sshin 35353541Sshin nd6_na_output(ifp, &saddr6, &taddr6, 354120941Sume ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 355181803Sbz (V_ip6_forwarding ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED, 356120941Sume tlladdr, (struct sockaddr *)proxydl); 35762587Sitojun freeit: 35862587Sitojun m_freem(m); 35953541Sshin return; 36053541Sshin 36153541Sshin bad: 362165118Sbz nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", 363165118Sbz ip6_sprintf(ip6bufs, &saddr6))); 364165118Sbz nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", 365165118Sbz ip6_sprintf(ip6bufs, &daddr6))); 366165118Sbz nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", 367165118Sbz ip6_sprintf(ip6bufs, &taddr6))); 368181803Sbz V_icmp6stat.icp6s_badns++; 36962587Sitojun m_freem(m); 37053541Sshin} 37153541Sshin 37253541Sshin/* 373108470Sschweikh * Output a Neighbor Solicitation Message. Caller specifies: 37453541Sshin * - ICMP6 header source IP6 address 37553541Sshin * - ND6 header target IP6 address 37653541Sshin * - ND6 header source datalink address 37753541Sshin * 37853541Sshin * Based on RFC 2461 379148987Sume * Based on RFC 2462 (duplicate address detection) 380171259Sdelphij * 381171259Sdelphij * ln - for source address determination 382171259Sdelphij * dad - duplicate address detection 38353541Sshin */ 38453541Sshinvoid 385186119Sqinglind6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6, 386186119Sqingli const struct in6_addr *taddr6, struct llentry *ln, int dad) 38753541Sshin{ 388183550Szec INIT_VNET_INET6(ifp->if_vnet); 38953541Sshin struct mbuf *m; 39053541Sshin struct ip6_hdr *ip6; 39153541Sshin struct nd_neighbor_solicit *nd_ns; 392148385Sume struct in6_addr *src, src_in; 39353541Sshin struct ip6_moptions im6o; 39453541Sshin int icmp6len; 39562587Sitojun int maxlen; 39653541Sshin caddr_t mac; 397148385Sume struct route_in6 ro; 398120941Sume 399148385Sume bzero(&ro, sizeof(ro)); 400148385Sume 40153541Sshin if (IN6_IS_ADDR_MULTICAST(taddr6)) 40253541Sshin return; 40353541Sshin 40462587Sitojun /* estimate the size of message */ 40562587Sitojun maxlen = sizeof(*ip6) + sizeof(*nd_ns); 40662587Sitojun maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 40762587Sitojun if (max_linkhdr + maxlen >= MCLBYTES) { 40862587Sitojun#ifdef DIAGNOSTIC 40962587Sitojun printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES " 41062587Sitojun "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 41162587Sitojun#endif 41253541Sshin return; 41362587Sitojun } 41453541Sshin 415111119Simp MGETHDR(m, M_DONTWAIT, MT_DATA); 41662587Sitojun if (m && max_linkhdr + maxlen >= MHLEN) { 417111119Simp MCLGET(m, M_DONTWAIT); 41862587Sitojun if ((m->m_flags & M_EXT) == 0) { 41962587Sitojun m_free(m); 42062587Sitojun m = NULL; 42162587Sitojun } 42262587Sitojun } 42362587Sitojun if (m == NULL) 42462587Sitojun return; 42578064Sume m->m_pkthdr.rcvif = NULL; 42662587Sitojun 42753541Sshin if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) { 42853541Sshin m->m_flags |= M_MCAST; 42953541Sshin im6o.im6o_multicast_ifp = ifp; 43053541Sshin im6o.im6o_multicast_hlim = 255; 43153541Sshin im6o.im6o_multicast_loop = 0; 43253541Sshin } 43353541Sshin 43453541Sshin icmp6len = sizeof(*nd_ns); 43553541Sshin m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len; 43695023Ssuz m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 43753541Sshin 43853541Sshin /* fill neighbor solicitation packet */ 43953541Sshin ip6 = mtod(m, struct ip6_hdr *); 44053541Sshin ip6->ip6_flow = 0; 44162587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 44262587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 44353541Sshin /* ip6->ip6_plen will be set later */ 44453541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 44553541Sshin ip6->ip6_hlim = 255; 44653541Sshin if (daddr6) 44753541Sshin ip6->ip6_dst = *daddr6; 44853541Sshin else { 44953541Sshin ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 450148385Sume ip6->ip6_dst.s6_addr16[1] = 0; 45153541Sshin ip6->ip6_dst.s6_addr32[1] = 0; 45253541Sshin ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE; 45353541Sshin ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3]; 45453541Sshin ip6->ip6_dst.s6_addr8[12] = 0xff; 455148385Sume if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 456148385Sume goto bad; 45753541Sshin } 45853541Sshin if (!dad) { 45953541Sshin /* 46053541Sshin * RFC2461 7.2.2: 46153541Sshin * "If the source address of the packet prompting the 46253541Sshin * solicitation is the same as one of the addresses assigned 46353541Sshin * to the outgoing interface, that address SHOULD be placed 46453541Sshin * in the IP Source Address of the outgoing solicitation. 46553541Sshin * Otherwise, any one of the addresses assigned to the 46653541Sshin * interface should be used." 46753541Sshin * 46853541Sshin * We use the source address for the prompting packet 46953541Sshin * (saddr6), if: 47053541Sshin * - saddr6 is given from the caller (by giving "ln"), and 47153541Sshin * - saddr6 belongs to the outgoing interface. 472148385Sume * Otherwise, we perform the source address selection as usual. 47353541Sshin */ 47495023Ssuz struct ip6_hdr *hip6; /* hold ip6 */ 475148385Sume struct in6_addr *hsrc = NULL; 47653541Sshin 477186119Sqingli if (ln && ln->la_hold) { 478148987Sume /* 479186119Sqingli * assuming every packet in la_hold has the same IP 480148987Sume * header 481148987Sume */ 482186119Sqingli hip6 = mtod(ln->la_hold, struct ip6_hdr *); 48353541Sshin /* XXX pullup? */ 484186119Sqingli if (sizeof(*hip6) < ln->la_hold->m_len) 485148385Sume hsrc = &hip6->ip6_src; 48653541Sshin else 487148385Sume hsrc = NULL; 488148385Sume } 489148385Sume if (hsrc && in6ifa_ifpwithaddr(ifp, hsrc)) 490148385Sume src = hsrc; 49153541Sshin else { 492148385Sume int error; 493148385Sume struct sockaddr_in6 dst_sa; 494148385Sume 495148385Sume bzero(&dst_sa, sizeof(dst_sa)); 496148385Sume dst_sa.sin6_family = AF_INET6; 497148385Sume dst_sa.sin6_len = sizeof(dst_sa); 498148385Sume dst_sa.sin6_addr = ip6->ip6_dst; 499148385Sume 500148385Sume src = in6_selectsrc(&dst_sa, NULL, 501148385Sume NULL, &ro, NULL, NULL, &error); 502148385Sume if (src == NULL) { 503165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 504148385Sume nd6log((LOG_DEBUG, 505148385Sume "nd6_ns_output: source can't be " 506148385Sume "determined: dst=%s, error=%d\n", 507165118Sbz ip6_sprintf(ip6buf, &dst_sa.sin6_addr), 508165118Sbz error)); 509148385Sume goto bad; 51053541Sshin } 51153541Sshin } 51253541Sshin } else { 51353541Sshin /* 51453541Sshin * Source address for DAD packet must always be IPv6 51553541Sshin * unspecified address. (0::0) 516148385Sume * We actually don't have to 0-clear the address (we did it 517148385Sume * above), but we do so here explicitly to make the intention 518148385Sume * clearer. 51953541Sshin */ 520148385Sume bzero(&src_in, sizeof(src_in)); 521148385Sume src = &src_in; 52253541Sshin } 523148385Sume ip6->ip6_src = *src; 52453541Sshin nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1); 52553541Sshin nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT; 52653541Sshin nd_ns->nd_ns_code = 0; 52753541Sshin nd_ns->nd_ns_reserved = 0; 52853541Sshin nd_ns->nd_ns_target = *taddr6; 529121315Sume in6_clearscope(&nd_ns->nd_ns_target); /* XXX */ 53053541Sshin 53153541Sshin /* 53253541Sshin * Add source link-layer address option. 53353541Sshin * 53453541Sshin * spec implementation 53553541Sshin * --- --- 53653541Sshin * DAD packet MUST NOT do not add the option 53753541Sshin * there's no link layer address: 53853541Sshin * impossible do not add the option 53953541Sshin * there's link layer address: 54053541Sshin * Multicast NS MUST add one add the option 54153541Sshin * Unicast NS SHOULD add one add the option 54253541Sshin */ 54353541Sshin if (!dad && (mac = nd6_ifptomac(ifp))) { 54453541Sshin int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 54553541Sshin struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); 54653541Sshin /* 8 byte alignments... */ 54753541Sshin optlen = (optlen + 7) & ~7; 548120941Sume 54953541Sshin m->m_pkthdr.len += optlen; 55053541Sshin m->m_len += optlen; 55153541Sshin icmp6len += optlen; 55253541Sshin bzero((caddr_t)nd_opt, optlen); 55353541Sshin nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; 55453541Sshin nd_opt->nd_opt_len = optlen >> 3; 55553541Sshin bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 55653541Sshin } 55753541Sshin 55853541Sshin ip6->ip6_plen = htons((u_short)icmp6len); 55953541Sshin nd_ns->nd_ns_cksum = 0; 560120941Sume nd_ns->nd_ns_cksum = 561120941Sume in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len); 56253541Sshin 563151536Ssuz ip6_output(m, NULL, &ro, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL, NULL); 564148385Sume icmp6_ifstat_inc(ifp, ifs6_out_msg); 565148385Sume icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit); 566181803Sbz V_icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++; 567148385Sume 568148385Sume if (ro.ro_rt) { /* we don't cache this route. */ 569148385Sume RTFREE(ro.ro_rt); 57053541Sshin } 571148385Sume return; 572148385Sume 573148385Sume bad: 574148385Sume if (ro.ro_rt) { 575148385Sume RTFREE(ro.ro_rt); 576148385Sume } 577148385Sume m_freem(m); 578148385Sume return; 57953541Sshin} 58053541Sshin 58153541Sshin/* 58253541Sshin * Neighbor advertisement input handling. 58353541Sshin * 58453541Sshin * Based on RFC 2461 585148987Sume * Based on RFC 2462 (duplicate address detection) 58662587Sitojun * 58762587Sitojun * the following items are not implemented yet: 58862587Sitojun * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 58962587Sitojun * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 59053541Sshin */ 59153541Sshinvoid 592171259Sdelphijnd6_na_input(struct mbuf *m, int off, int icmp6len) 59353541Sshin{ 594183550Szec INIT_VNET_INET6(curvnet); 59553541Sshin struct ifnet *ifp = m->m_pkthdr.rcvif; 59653541Sshin struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 59762587Sitojun struct nd_neighbor_advert *nd_na; 59853541Sshin struct in6_addr daddr6 = ip6->ip6_dst; 59962587Sitojun struct in6_addr taddr6; 60062587Sitojun int flags; 60162587Sitojun int is_router; 60262587Sitojun int is_solicited; 60362587Sitojun int is_override; 60453541Sshin char *lladdr = NULL; 60553541Sshin int lladdrlen = 0; 60653541Sshin struct ifaddr *ifa; 607186119Sqingli struct llentry *ln = NULL; 60853541Sshin union nd_opts ndopts; 609186119Sqingli struct mbuf *chain = NULL; 610186119Sqingli struct sockaddr_in6 sin6; 611165118Sbz char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 61253541Sshin 61353541Sshin if (ip6->ip6_hlim != 255) { 61478064Sume nd6log((LOG_ERR, 61578064Sume "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n", 616165118Sbz ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 617165118Sbz ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 61878064Sume goto bad; 61962587Sitojun } 62062587Sitojun 62162587Sitojun#ifndef PULLDOWN_TEST 62262587Sitojun IP6_EXTHDR_CHECK(m, off, icmp6len,); 62362587Sitojun nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off); 62462587Sitojun#else 62562587Sitojun IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len); 62662587Sitojun if (nd_na == NULL) { 627181803Sbz V_icmp6stat.icp6s_tooshort++; 62853541Sshin return; 62953541Sshin } 63062587Sitojun#endif 631148385Sume 63262587Sitojun flags = nd_na->nd_na_flags_reserved; 63362587Sitojun is_router = ((flags & ND_NA_FLAG_ROUTER) != 0); 63462587Sitojun is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0); 63562587Sitojun is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0); 63653541Sshin 637148385Sume taddr6 = nd_na->nd_na_target; 638148385Sume if (in6_setscope(&taddr6, ifp, NULL)) 639150202Ssuz goto bad; /* XXX: impossible */ 64053541Sshin 64153541Sshin if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 64278064Sume nd6log((LOG_ERR, 64353541Sshin "nd6_na_input: invalid target address %s\n", 644165118Sbz ip6_sprintf(ip6bufs, &taddr6))); 64578064Sume goto bad; 64653541Sshin } 64753541Sshin if (IN6_IS_ADDR_MULTICAST(&daddr6)) 64853541Sshin if (is_solicited) { 64978064Sume nd6log((LOG_ERR, 65078064Sume "nd6_na_input: a solicited adv is multicasted\n")); 65178064Sume goto bad; 65253541Sshin } 65353541Sshin 65453541Sshin icmp6len -= sizeof(*nd_na); 65553541Sshin nd6_option_init(nd_na + 1, icmp6len, &ndopts); 65653541Sshin if (nd6_options(&ndopts) < 0) { 65778064Sume nd6log((LOG_INFO, 65878064Sume "nd6_na_input: invalid ND option, ignored\n")); 65978064Sume /* nd6_options have incremented stats */ 66062587Sitojun goto freeit; 66153541Sshin } 66253541Sshin 66353541Sshin if (ndopts.nd_opts_tgt_lladdr) { 66453541Sshin lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 66553541Sshin lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 66653541Sshin } 66753541Sshin 66853541Sshin ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 66953541Sshin 67053541Sshin /* 67153541Sshin * Target address matches one of my interface address. 67253541Sshin * 67353541Sshin * If my address is tentative, this means that there's somebody 67453541Sshin * already using the same address as mine. This indicates DAD failure. 67553541Sshin * This is defined in RFC 2462. 67653541Sshin * 67753541Sshin * Otherwise, process as defined in RFC 2461. 67853541Sshin */ 67953541Sshin if (ifa 68053541Sshin && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) { 68153541Sshin nd6_dad_na_input(ifa); 68262587Sitojun goto freeit; 68353541Sshin } 68453541Sshin 68595023Ssuz /* Just for safety, maybe unnecessary. */ 68653541Sshin if (ifa) { 68753541Sshin log(LOG_ERR, 68853541Sshin "nd6_na_input: duplicate IP6 address %s\n", 689165118Sbz ip6_sprintf(ip6bufs, &taddr6)); 69062587Sitojun goto freeit; 69153541Sshin } 69253541Sshin 69353541Sshin if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 694120941Sume nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s " 695165118Sbz "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6), 696120941Sume ifp->if_addrlen, lladdrlen - 2)); 69778064Sume goto bad; 69853541Sshin } 69953541Sshin 70053541Sshin /* 701120941Sume * If no neighbor cache entry is found, NA SHOULD silently be 702120941Sume * discarded. 70353541Sshin */ 704186119Sqingli IF_AFDATA_LOCK(ifp); 705186119Sqingli ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp); 706186119Sqingli IF_AFDATA_UNLOCK(ifp); 707186119Sqingli if (ln == NULL) { 70862587Sitojun goto freeit; 709186119Sqingli } 71053541Sshin 71153541Sshin if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 71253541Sshin /* 71353541Sshin * If the link-layer has address, and no lladdr option came, 71453541Sshin * discard the packet. 71553541Sshin */ 716186119Sqingli if (ifp->if_addrlen && lladdr == NULL) { 71762587Sitojun goto freeit; 718186119Sqingli } 71953541Sshin 72053541Sshin /* 72153541Sshin * Record link-layer address, and update the state. 72253541Sshin */ 723186119Sqingli bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen); 724186119Sqingli ln->la_flags |= LLE_VALID; 72553541Sshin if (is_solicited) { 72653541Sshin ln->ln_state = ND6_LLINFO_REACHABLE; 72762587Sitojun ln->ln_byhint = 0; 728151539Ssuz if (!ND6_LLINFO_PERMANENT(ln)) { 729186119Sqingli nd6_llinfo_settimer_locked(ln, 730186119Sqingli (long)ND_IFINFO(ln->lle_tbl->llt_ifp)->reachable * hz); 731120941Sume } 73278064Sume } else { 73353541Sshin ln->ln_state = ND6_LLINFO_STALE; 734186119Sqingli nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz); 73578064Sume } 73678064Sume if ((ln->ln_router = is_router) != 0) { 73778064Sume /* 73878064Sume * This means a router's state has changed from 73978064Sume * non-reachable to probably reachable, and might 74078064Sume * affect the status of associated prefixes.. 74178064Sume */ 74278064Sume pfxlist_onlink_check(); 74378064Sume } 74453541Sshin } else { 74553541Sshin int llchange; 74653541Sshin 74753541Sshin /* 74853541Sshin * Check if the link-layer address has changed or not. 74953541Sshin */ 750151465Ssuz if (lladdr == NULL) 75153541Sshin llchange = 0; 75253541Sshin else { 753186119Sqingli if (ln->la_flags & LLE_VALID) { 754186119Sqingli if (bcmp(lladdr, &ln->ll_addr, ifp->if_addrlen)) 75553541Sshin llchange = 1; 75653541Sshin else 75753541Sshin llchange = 0; 75853541Sshin } else 75953541Sshin llchange = 1; 76053541Sshin } 76153541Sshin 76253541Sshin /* 76353541Sshin * This is VERY complex. Look at it with care. 76453541Sshin * 76553541Sshin * override solicit lladdr llchange action 76653541Sshin * (L: record lladdr) 76753541Sshin * 76853541Sshin * 0 0 n -- (2c) 76953541Sshin * 0 0 y n (2b) L 77053541Sshin * 0 0 y y (1) REACHABLE->STALE 77153541Sshin * 0 1 n -- (2c) *->REACHABLE 77253541Sshin * 0 1 y n (2b) L *->REACHABLE 77353541Sshin * 0 1 y y (1) REACHABLE->STALE 77453541Sshin * 1 0 n -- (2a) 77553541Sshin * 1 0 y n (2a) L 77653541Sshin * 1 0 y y (2a) L *->STALE 77753541Sshin * 1 1 n -- (2a) *->REACHABLE 77853541Sshin * 1 1 y n (2a) L *->REACHABLE 77953541Sshin * 1 1 y y (2a) L *->REACHABLE 78053541Sshin */ 781151539Ssuz if (!is_override && (lladdr != NULL && llchange)) { /* (1) */ 78253541Sshin /* 78353541Sshin * If state is REACHABLE, make it STALE. 78453541Sshin * no other updates should be done. 78553541Sshin */ 78678064Sume if (ln->ln_state == ND6_LLINFO_REACHABLE) { 78753541Sshin ln->ln_state = ND6_LLINFO_STALE; 788186119Sqingli nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz); 78978064Sume } 79062587Sitojun goto freeit; 79153541Sshin } else if (is_override /* (2a) */ 792151465Ssuz || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */ 793151465Ssuz || lladdr == NULL) { /* (2c) */ 79453541Sshin /* 79553541Sshin * Update link-local address, if any. 79653541Sshin */ 797151465Ssuz if (lladdr != NULL) { 798186119Sqingli bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen); 799186119Sqingli ln->la_flags |= LLE_VALID; 80053541Sshin } 80153541Sshin 80253541Sshin /* 80353541Sshin * If solicited, make the state REACHABLE. 80453541Sshin * If not solicited and the link-layer address was 80553541Sshin * changed, make it STALE. 80653541Sshin */ 80753541Sshin if (is_solicited) { 80853541Sshin ln->ln_state = ND6_LLINFO_REACHABLE; 80962587Sitojun ln->ln_byhint = 0; 810151539Ssuz if (!ND6_LLINFO_PERMANENT(ln)) { 811186119Sqingli nd6_llinfo_settimer_locked(ln, 812151539Ssuz (long)ND_IFINFO(ifp)->reachable * hz); 81353541Sshin } 81453541Sshin } else { 815151465Ssuz if (lladdr != NULL && llchange) { 81653541Sshin ln->ln_state = ND6_LLINFO_STALE; 817186119Sqingli nd6_llinfo_settimer_locked(ln, 818181803Sbz (long)V_nd6_gctimer * hz); 81978064Sume } 82053541Sshin } 82153541Sshin } 82253541Sshin 82353541Sshin if (ln->ln_router && !is_router) { 82453541Sshin /* 82553541Sshin * The peer dropped the router flag. 82653541Sshin * Remove the sender from the Default Router List and 82753541Sshin * update the Destination Cache entries. 82853541Sshin */ 82953541Sshin struct nd_defrouter *dr; 83053541Sshin struct in6_addr *in6; 83153541Sshin 832186119Sqingli in6 = &L3_ADDR_SIN6(ln)->sin6_addr; 83395023Ssuz 83495023Ssuz /* 83595023Ssuz * Lock to protect the default router list. 83695023Ssuz * XXX: this might be unnecessary, since this function 83795023Ssuz * is only called under the network software interrupt 838120941Sume * context. However, we keep it just for safety. 83995023Ssuz */ 840186119Sqingli dr = defrouter_lookup(in6, ln->lle_tbl->llt_ifp); 84153541Sshin if (dr) 84253541Sshin defrtrlist_del(dr); 843181803Sbz else if (!V_ip6_forwarding) { 84453541Sshin /* 84553541Sshin * Even if the neighbor is not in the default 84653541Sshin * router list, the neighbor may be used 84753541Sshin * as a next hop for some destinations 84853541Sshin * (e.g. redirect case). So we must 84953541Sshin * call rt6_flush explicitly. 85053541Sshin */ 851128422Sluigi rt6_flush(&ip6->ip6_src, ifp); 85253541Sshin } 85353541Sshin } 85453541Sshin ln->ln_router = is_router; 85553541Sshin } 856186119Sqingli /* XXX - QL 857186119Sqingli * Does this matter? 858186119Sqingli * rt->rt_flags &= ~RTF_REJECT; 859186119Sqingli */ 860186119Sqingli ln->la_asked = 0; 861186119Sqingli if (ln->la_hold) { 862151539Ssuz struct mbuf *m_hold, *m_hold_next; 863151539Ssuz 864169273Ssuz /* 865186119Sqingli * reset the la_hold in advance, to explicitly 866186119Sqingli * prevent a la_hold lookup in nd6_output() 867169273Ssuz * (wouldn't happen, though...) 868169273Ssuz */ 869186119Sqingli for (m_hold = ln->la_hold, ln->la_hold = NULL; 870169241Ssuz m_hold; m_hold = m_hold_next) { 871151539Ssuz m_hold_next = m_hold->m_nextpkt; 872169241Ssuz m_hold->m_nextpkt = NULL; 873151539Ssuz /* 874151539Ssuz * we assume ifp is not a loopback here, so just set 875151539Ssuz * the 2nd argument as the 1st one. 876151539Ssuz */ 877186119Sqingli nd6_output_lle(ifp, ifp, m_hold, L3_ADDR_SIN6(ln), NULL, ln, &chain); 878151539Ssuz } 87953541Sshin } 880186119Sqingli freeit: 881186119Sqingli if (ln) { 882186119Sqingli if (chain) 883186119Sqingli memcpy(&sin6, L3_ADDR_SIN6(ln), sizeof(sin6)); 884186119Sqingli LLE_WUNLOCK(ln); 88562587Sitojun 886186119Sqingli if (chain) 887186119Sqingli nd6_output_flush(ifp, ifp, chain, &sin6, NULL); 888186119Sqingli } 88962587Sitojun m_freem(m); 89078064Sume return; 89178064Sume 89278064Sume bad: 893186119Sqingli if (ln) 894186119Sqingli LLE_WUNLOCK(ln); 895186119Sqingli 896181803Sbz V_icmp6stat.icp6s_badna++; 89778064Sume m_freem(m); 89853541Sshin} 89953541Sshin 90053541Sshin/* 90153541Sshin * Neighbor advertisement output handling. 90253541Sshin * 90353541Sshin * Based on RFC 2461 90453541Sshin * 90562587Sitojun * the following items are not implemented yet: 90662587Sitojun * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 90762587Sitojun * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 908171259Sdelphij * 909171259Sdelphij * tlladdr - 1 if include target link-layer address 910171259Sdelphij * sdl0 - sockaddr_dl (= proxy NA) or NULL 91153541Sshin */ 91253541Sshinvoid 913171259Sdelphijnd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0, 914171259Sdelphij const struct in6_addr *taddr6, u_long flags, int tlladdr, 915171259Sdelphij struct sockaddr *sdl0) 91653541Sshin{ 917183550Szec INIT_VNET_INET6(ifp->if_vnet); 91853541Sshin struct mbuf *m; 91953541Sshin struct ip6_hdr *ip6; 92053541Sshin struct nd_neighbor_advert *nd_na; 92153541Sshin struct ip6_moptions im6o; 922148385Sume struct in6_addr *src, daddr6; 923148385Sume struct sockaddr_in6 dst_sa; 924148385Sume int icmp6len, maxlen, error; 92592733Speter caddr_t mac = NULL; 926148385Sume struct route_in6 ro; 92762587Sitojun 928148385Sume bzero(&ro, sizeof(ro)); 929148385Sume 930148385Sume daddr6 = *daddr6_0; /* make a local copy for modification */ 931148385Sume 93262587Sitojun /* estimate the size of message */ 93362587Sitojun maxlen = sizeof(*ip6) + sizeof(*nd_na); 93462587Sitojun maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 93562587Sitojun if (max_linkhdr + maxlen >= MCLBYTES) { 93662587Sitojun#ifdef DIAGNOSTIC 93762587Sitojun printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES " 93862587Sitojun "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 93962587Sitojun#endif 94053541Sshin return; 94162587Sitojun } 94253541Sshin 943111119Simp MGETHDR(m, M_DONTWAIT, MT_DATA); 94462587Sitojun if (m && max_linkhdr + maxlen >= MHLEN) { 945111119Simp MCLGET(m, M_DONTWAIT); 94662587Sitojun if ((m->m_flags & M_EXT) == 0) { 94762587Sitojun m_free(m); 94862587Sitojun m = NULL; 94962587Sitojun } 95062587Sitojun } 95162587Sitojun if (m == NULL) 95262587Sitojun return; 95378064Sume m->m_pkthdr.rcvif = NULL; 95462587Sitojun 955148385Sume if (IN6_IS_ADDR_MULTICAST(&daddr6)) { 95653541Sshin m->m_flags |= M_MCAST; 95753541Sshin im6o.im6o_multicast_ifp = ifp; 95853541Sshin im6o.im6o_multicast_hlim = 255; 95953541Sshin im6o.im6o_multicast_loop = 0; 96053541Sshin } 96153541Sshin 96253541Sshin icmp6len = sizeof(*nd_na); 96353541Sshin m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len; 96495023Ssuz m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 96553541Sshin 96653541Sshin /* fill neighbor advertisement packet */ 96753541Sshin ip6 = mtod(m, struct ip6_hdr *); 96853541Sshin ip6->ip6_flow = 0; 96962587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 97062587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 97153541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 97253541Sshin ip6->ip6_hlim = 255; 973148385Sume if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) { 97453541Sshin /* reply to DAD */ 975153227Sume daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 976153227Sume daddr6.s6_addr16[1] = 0; 977153227Sume daddr6.s6_addr32[1] = 0; 978153227Sume daddr6.s6_addr32[2] = 0; 979153227Sume daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE; 980148385Sume if (in6_setscope(&daddr6, ifp, NULL)) 981148385Sume goto bad; 982148385Sume 98353541Sshin flags &= ~ND_NA_FLAG_SOLICITED; 984148385Sume } 985148385Sume ip6->ip6_dst = daddr6; 986148385Sume bzero(&dst_sa, sizeof(struct sockaddr_in6)); 987148385Sume dst_sa.sin6_family = AF_INET6; 988148385Sume dst_sa.sin6_len = sizeof(struct sockaddr_in6); 989148385Sume dst_sa.sin6_addr = daddr6; 99053541Sshin 99153541Sshin /* 99253541Sshin * Select a source whose scope is the same as that of the dest. 99353541Sshin */ 994148385Sume bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa)); 995148385Sume src = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, NULL, &error); 996148385Sume if (src == NULL) { 997165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 998148385Sume nd6log((LOG_DEBUG, "nd6_na_output: source can't be " 999148385Sume "determined: dst=%s, error=%d\n", 1000165118Sbz ip6_sprintf(ip6buf, &dst_sa.sin6_addr), error)); 1001148385Sume goto bad; 100253541Sshin } 1003148385Sume ip6->ip6_src = *src; 100453541Sshin nd_na = (struct nd_neighbor_advert *)(ip6 + 1); 100553541Sshin nd_na->nd_na_type = ND_NEIGHBOR_ADVERT; 100653541Sshin nd_na->nd_na_code = 0; 100753541Sshin nd_na->nd_na_target = *taddr6; 1008121315Sume in6_clearscope(&nd_na->nd_na_target); /* XXX */ 100953541Sshin 101053541Sshin /* 101153541Sshin * "tlladdr" indicates NS's condition for adding tlladdr or not. 101253541Sshin * see nd6_ns_input() for details. 101353541Sshin * Basically, if NS packet is sent to unicast/anycast addr, 101453541Sshin * target lladdr option SHOULD NOT be included. 101553541Sshin */ 101662587Sitojun if (tlladdr) { 101762587Sitojun /* 101862587Sitojun * sdl0 != NULL indicates proxy NA. If we do proxy, use 101962587Sitojun * lladdr in sdl0. If we are not proxying (sending NA for 102062587Sitojun * my address) use lladdr configured for the interface. 102162587Sitojun */ 1022142215Sglebius if (sdl0 == NULL) { 1023142215Sglebius#ifdef DEV_CARP 1024142215Sglebius if (ifp->if_carp) 1025142215Sglebius mac = carp_macmatch6(ifp->if_carp, m, taddr6); 1026142215Sglebius if (mac == NULL) 1027142215Sglebius mac = nd6_ifptomac(ifp); 1028142215Sglebius#else 102962587Sitojun mac = nd6_ifptomac(ifp); 1030142215Sglebius#endif 1031142215Sglebius } else if (sdl0->sa_family == AF_LINK) { 103262587Sitojun struct sockaddr_dl *sdl; 103362587Sitojun sdl = (struct sockaddr_dl *)sdl0; 103462587Sitojun if (sdl->sdl_alen == ifp->if_addrlen) 103562587Sitojun mac = LLADDR(sdl); 103662587Sitojun } 103762587Sitojun } 103862587Sitojun if (tlladdr && mac) { 103953541Sshin int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 104053541Sshin struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1); 1041120941Sume 104253541Sshin /* roundup to 8 bytes alignment! */ 104353541Sshin optlen = (optlen + 7) & ~7; 104453541Sshin 104553541Sshin m->m_pkthdr.len += optlen; 104653541Sshin m->m_len += optlen; 104753541Sshin icmp6len += optlen; 104853541Sshin bzero((caddr_t)nd_opt, optlen); 104953541Sshin nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 105053541Sshin nd_opt->nd_opt_len = optlen >> 3; 105153541Sshin bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 105253541Sshin } else 105353541Sshin flags &= ~ND_NA_FLAG_OVERRIDE; 105453541Sshin 105553541Sshin ip6->ip6_plen = htons((u_short)icmp6len); 105653541Sshin nd_na->nd_na_flags_reserved = flags; 105753541Sshin nd_na->nd_na_cksum = 0; 105853541Sshin nd_na->nd_na_cksum = 1059120941Sume in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len); 106053541Sshin 1061148385Sume ip6_output(m, NULL, &ro, 0, &im6o, NULL, NULL); 1062148385Sume icmp6_ifstat_inc(ifp, ifs6_out_msg); 1063148385Sume icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert); 1064181803Sbz V_icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++; 1065148385Sume 1066148385Sume if (ro.ro_rt) { /* we don't cache this route. */ 1067148385Sume RTFREE(ro.ro_rt); 106853541Sshin } 1069148385Sume return; 1070148385Sume 1071148385Sume bad: 1072148385Sume if (ro.ro_rt) { 1073148385Sume RTFREE(ro.ro_rt); 1074148385Sume } 1075148385Sume m_freem(m); 1076148385Sume return; 107753541Sshin} 107853541Sshin 107953541Sshincaddr_t 1080171259Sdelphijnd6_ifptomac(struct ifnet *ifp) 108153541Sshin{ 108253541Sshin switch (ifp->if_type) { 108353541Sshin case IFT_ARCNET: 108453541Sshin case IFT_ETHER: 108553541Sshin case IFT_FDDI: 108678064Sume case IFT_IEEE1394: 108778468Ssumikawa#ifdef IFT_L2VLAN 108878468Ssumikawa case IFT_L2VLAN: 108978468Ssumikawa#endif 109078064Sume#ifdef IFT_IEEE80211 109178064Sume case IFT_IEEE80211: 109278064Sume#endif 1093142215Sglebius#ifdef IFT_CARP 1094142215Sglebius case IFT_CARP: 1095142215Sglebius#endif 1096149829Sthompsa case IFT_BRIDGE: 1097120049Smdodd case IFT_ISO88025: 1098147306Sbrooks return IF_LLADDR(ifp); 109953541Sshin default: 110053541Sshin return NULL; 110153541Sshin } 110253541Sshin} 110353541Sshin 110460938SjakeTAILQ_HEAD(dadq_head, dadq); 110553541Sshinstruct dadq { 110660938Sjake TAILQ_ENTRY(dadq) dad_list; 110753541Sshin struct ifaddr *dad_ifa; 110853541Sshin int dad_count; /* max NS to send */ 110962587Sitojun int dad_ns_tcount; /* # of trials to send NS */ 111053541Sshin int dad_ns_ocount; /* NS sent so far */ 111153541Sshin int dad_ns_icount; 111253541Sshin int dad_na_icount; 111378064Sume struct callout dad_timer_ch; 111453541Sshin}; 111553541Sshin 1116185088Szec#ifdef VIMAGE_GLOBALS 111753541Sshinstatic struct dadq_head dadq; 1118185088Szecint dad_init; 1119185088Szec#endif 112053541Sshin 112153541Sshinstatic struct dadq * 1122171259Sdelphijnd6_dad_find(struct ifaddr *ifa) 112353541Sshin{ 1124183550Szec INIT_VNET_INET6(curvnet); 112553541Sshin struct dadq *dp; 112653541Sshin 1127181803Sbz for (dp = V_dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) { 112853541Sshin if (dp->dad_ifa == ifa) 112953541Sshin return dp; 113053541Sshin } 113153541Sshin return NULL; 113253541Sshin} 113353541Sshin 113478064Sumestatic void 1135171259Sdelphijnd6_dad_starttimer(struct dadq *dp, int ticks) 113678064Sume{ 113778064Sume 113878064Sume callout_reset(&dp->dad_timer_ch, ticks, 1139175162Sobrien (void (*)(void *))nd6_dad_timer, (void *)dp->dad_ifa); 114078064Sume} 114178064Sume 114278064Sumestatic void 1143171259Sdelphijnd6_dad_stoptimer(struct dadq *dp) 114478064Sume{ 114578064Sume 114678064Sume callout_stop(&dp->dad_timer_ch); 114778064Sume} 114878064Sume 114953541Sshin/* 1150148987Sume * Start Duplicate Address Detection (DAD) for specified interface address. 115153541Sshin */ 115253541Sshinvoid 1153171259Sdelphijnd6_dad_start(struct ifaddr *ifa, int delay) 115453541Sshin{ 1155183550Szec INIT_VNET_INET6(curvnet); 115653541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 115753541Sshin struct dadq *dp; 1158165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 115953541Sshin 1160181803Sbz if (!V_dad_init) { 1161181803Sbz TAILQ_INIT(&V_dadq); 1162181803Sbz V_dad_init++; 116353541Sshin } 116453541Sshin 116553541Sshin /* 116653541Sshin * If we don't need DAD, don't do it. 116753541Sshin * There are several cases: 116853541Sshin * - DAD is disabled (ip6_dad_count == 0) 116953541Sshin * - the interface address is anycast 117053541Sshin */ 117153541Sshin if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) { 117262587Sitojun log(LOG_DEBUG, 117362587Sitojun "nd6_dad_start: called with non-tentative address " 117453541Sshin "%s(%s)\n", 1175165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 117653541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 117753541Sshin return; 117853541Sshin } 117953541Sshin if (ia->ia6_flags & IN6_IFF_ANYCAST) { 118053541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 118153541Sshin return; 118253541Sshin } 1183181803Sbz if (!V_ip6_dad_count) { 118453541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 118553541Sshin return; 118653541Sshin } 1187151465Ssuz if (ifa->ifa_ifp == NULL) 118853541Sshin panic("nd6_dad_start: ifa->ifa_ifp == NULL"); 1189120941Sume if (!(ifa->ifa_ifp->if_flags & IFF_UP)) { 119053541Sshin return; 1191120941Sume } 119253541Sshin if (nd6_dad_find(ifa) != NULL) { 119353541Sshin /* DAD already in progress */ 119453541Sshin return; 119553541Sshin } 119653541Sshin 119753541Sshin dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT); 119853541Sshin if (dp == NULL) { 119962587Sitojun log(LOG_ERR, "nd6_dad_start: memory allocation failed for " 120053541Sshin "%s(%s)\n", 1201165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 120253541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 120353541Sshin return; 120453541Sshin } 120553541Sshin bzero(dp, sizeof(*dp)); 120678064Sume callout_init(&dp->dad_timer_ch, 0); 1207182150Sjulian TAILQ_INSERT_TAIL(&V_dadq, (struct dadq *)dp, dad_list); 120853541Sshin 120978064Sume nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp), 1210165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 121153541Sshin 121253541Sshin /* 121353541Sshin * Send NS packet for DAD, ip6_dad_count times. 121453541Sshin * Note that we must delay the first transmission, if this is the 121553541Sshin * first packet to be sent from the interface after interface 121653541Sshin * (re)initialization. 121753541Sshin */ 121853541Sshin dp->dad_ifa = ifa; 121995023Ssuz IFAREF(ifa); /* just for safety */ 1220181803Sbz dp->dad_count = V_ip6_dad_count; 122153541Sshin dp->dad_ns_icount = dp->dad_na_icount = 0; 122262587Sitojun dp->dad_ns_ocount = dp->dad_ns_tcount = 0; 1223151539Ssuz if (delay == 0) { 122462587Sitojun nd6_dad_ns_output(dp, ifa); 1225121161Sume nd6_dad_starttimer(dp, 1226151539Ssuz (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 122753541Sshin } else { 1228151539Ssuz nd6_dad_starttimer(dp, delay); 122953541Sshin } 123053541Sshin} 123153541Sshin 123278064Sume/* 123378064Sume * terminate DAD unconditionally. used for address removals. 123478064Sume */ 123578064Sumevoid 1236171259Sdelphijnd6_dad_stop(struct ifaddr *ifa) 123778064Sume{ 1238183550Szec INIT_VNET_INET6(curvnet); 123978064Sume struct dadq *dp; 124078064Sume 1241181803Sbz if (!V_dad_init) 124278064Sume return; 124378064Sume dp = nd6_dad_find(ifa); 124478064Sume if (!dp) { 124578064Sume /* DAD wasn't started yet */ 124678064Sume return; 124778064Sume } 124878064Sume 124978064Sume nd6_dad_stoptimer(dp); 125078064Sume 1251181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 125278064Sume free(dp, M_IP6NDP); 125378064Sume dp = NULL; 125478064Sume IFAFREE(ifa); 125578064Sume} 125678064Sume 125753541Sshinstatic void 1258171259Sdelphijnd6_dad_timer(struct ifaddr *ifa) 125953541Sshin{ 1260183550Szec CURVNET_SET(dp->dad_vnet); 1261183550Szec INIT_VNET_INET6(curvnet); 126253541Sshin int s; 126353541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 126453541Sshin struct dadq *dp; 1265165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 126653541Sshin 126795023Ssuz s = splnet(); /* XXX */ 126853541Sshin 126953541Sshin /* Sanity check */ 127053541Sshin if (ia == NULL) { 127162587Sitojun log(LOG_ERR, "nd6_dad_timer: called with null parameter\n"); 127253541Sshin goto done; 127353541Sshin } 127453541Sshin dp = nd6_dad_find(ifa); 127553541Sshin if (dp == NULL) { 127662587Sitojun log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n"); 127753541Sshin goto done; 127853541Sshin } 127953541Sshin if (ia->ia6_flags & IN6_IFF_DUPLICATED) { 128062587Sitojun log(LOG_ERR, "nd6_dad_timer: called with duplicated address " 128153541Sshin "%s(%s)\n", 1282165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 128353541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 128453541Sshin goto done; 128553541Sshin } 128653541Sshin if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) { 128762587Sitojun log(LOG_ERR, "nd6_dad_timer: called with non-tentative address " 128853541Sshin "%s(%s)\n", 1289165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 129053541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 129153541Sshin goto done; 129253541Sshin } 129353541Sshin 129462587Sitojun /* timeouted with IFF_{RUNNING,UP} check */ 1295181803Sbz if (dp->dad_ns_tcount > V_dad_maxtry) { 129678064Sume nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n", 1297120941Sume if_name(ifa->ifa_ifp))); 129862587Sitojun 1299181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 130062587Sitojun free(dp, M_IP6NDP); 130162587Sitojun dp = NULL; 130262587Sitojun IFAFREE(ifa); 130362587Sitojun goto done; 130462587Sitojun } 130562587Sitojun 130653541Sshin /* Need more checks? */ 130753541Sshin if (dp->dad_ns_ocount < dp->dad_count) { 130853541Sshin /* 130953541Sshin * We have more NS to go. Send NS packet for DAD. 131053541Sshin */ 131162587Sitojun nd6_dad_ns_output(dp, ifa); 1312120941Sume nd6_dad_starttimer(dp, 1313151539Ssuz (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 131453541Sshin } else { 131553541Sshin /* 131653541Sshin * We have transmitted sufficient number of DAD packets. 131753541Sshin * See what we've got. 131853541Sshin */ 131953541Sshin int duplicate; 132053541Sshin 132153541Sshin duplicate = 0; 132253541Sshin 132353541Sshin if (dp->dad_na_icount) { 132453541Sshin /* 132553541Sshin * the check is in nd6_dad_na_input(), 132653541Sshin * but just in case 132753541Sshin */ 132853541Sshin duplicate++; 132953541Sshin } 133053541Sshin 133153541Sshin if (dp->dad_ns_icount) { 133253541Sshin /* We've seen NS, means DAD has failed. */ 133353541Sshin duplicate++; 133453541Sshin } 133553541Sshin 133653541Sshin if (duplicate) { 133753541Sshin /* (*dp) will be freed in nd6_dad_duplicated() */ 133853541Sshin dp = NULL; 133953541Sshin nd6_dad_duplicated(ifa); 134053541Sshin } else { 134153541Sshin /* 134253541Sshin * We are done with DAD. No NA came, no NS came. 1343148987Sume * No duplicate address found. 134453541Sshin */ 134553541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 134653541Sshin 134778064Sume nd6log((LOG_DEBUG, 134862587Sitojun "%s: DAD complete for %s - no duplicates found\n", 134962587Sitojun if_name(ifa->ifa_ifp), 1350165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 135153541Sshin 1352181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 135353541Sshin free(dp, M_IP6NDP); 135453541Sshin dp = NULL; 135562587Sitojun IFAFREE(ifa); 135653541Sshin } 135753541Sshin } 135853541Sshin 135953541Sshindone: 136053541Sshin splx(s); 1361183550Szec CURVNET_RESTORE(); 136253541Sshin} 136353541Sshin 136453541Sshinvoid 1365171259Sdelphijnd6_dad_duplicated(struct ifaddr *ifa) 136653541Sshin{ 1367183550Szec INIT_VNET_INET6(curvnet); 136853541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1369151477Ssuz struct ifnet *ifp; 137053541Sshin struct dadq *dp; 1371165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 137253541Sshin 137353541Sshin dp = nd6_dad_find(ifa); 137453541Sshin if (dp == NULL) { 137562587Sitojun log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n"); 137653541Sshin return; 137753541Sshin } 137853541Sshin 137978064Sume log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: " 138078064Sume "NS in/out=%d/%d, NA in=%d\n", 1381165118Sbz if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 138278064Sume dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount); 138353541Sshin 138453541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 138553541Sshin ia->ia6_flags |= IN6_IFF_DUPLICATED; 138653541Sshin 1387148987Sume /* We are done with DAD, with duplicate address found. (failure) */ 138878064Sume nd6_dad_stoptimer(dp); 138953541Sshin 1390151477Ssuz ifp = ifa->ifa_ifp; 139162587Sitojun log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n", 1392165118Sbz if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)); 139362587Sitojun log(LOG_ERR, "%s: manual intervention required\n", 1394151477Ssuz if_name(ifp)); 139553541Sshin 1396151477Ssuz /* 1397151477Ssuz * If the address is a link-local address formed from an interface 1398151477Ssuz * identifier based on the hardware address which is supposed to be 1399151477Ssuz * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP 1400151477Ssuz * operation on the interface SHOULD be disabled. 1401151477Ssuz * [rfc2462bis-03 Section 5.4.5] 1402151477Ssuz */ 1403151477Ssuz if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) { 1404151477Ssuz struct in6_addr in6; 1405151477Ssuz 1406151477Ssuz /* 1407151477Ssuz * To avoid over-reaction, we only apply this logic when we are 1408151477Ssuz * very sure that hardware addresses are supposed to be unique. 1409151477Ssuz */ 1410151477Ssuz switch (ifp->if_type) { 1411151477Ssuz case IFT_ETHER: 1412151477Ssuz case IFT_FDDI: 1413151477Ssuz case IFT_ATM: 1414151477Ssuz case IFT_IEEE1394: 1415151477Ssuz#ifdef IFT_IEEE80211 1416151477Ssuz case IFT_IEEE80211: 1417151477Ssuz#endif 1418151477Ssuz in6 = ia->ia_addr.sin6_addr; 1419151477Ssuz if (in6_get_hw_ifid(ifp, &in6) == 0 && 1420151477Ssuz IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) { 1421151477Ssuz ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED; 1422151477Ssuz log(LOG_ERR, "%s: possible hardware address " 1423151477Ssuz "duplication detected, disable IPv6\n", 1424151477Ssuz if_name(ifp)); 1425151477Ssuz } 1426151477Ssuz break; 1427151477Ssuz } 1428151477Ssuz } 1429151477Ssuz 1430181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 143153541Sshin free(dp, M_IP6NDP); 143253541Sshin dp = NULL; 143362587Sitojun IFAFREE(ifa); 143453541Sshin} 143553541Sshin 143662587Sitojunstatic void 1437171259Sdelphijnd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa) 143862587Sitojun{ 143962587Sitojun struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 144062587Sitojun struct ifnet *ifp = ifa->ifa_ifp; 144162587Sitojun 144262587Sitojun dp->dad_ns_tcount++; 144362587Sitojun if ((ifp->if_flags & IFF_UP) == 0) { 144462587Sitojun return; 144562587Sitojun } 1446148887Srwatson if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 144762587Sitojun return; 144862587Sitojun } 144962587Sitojun 145062587Sitojun dp->dad_ns_ocount++; 145162587Sitojun nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1); 145262587Sitojun} 145362587Sitojun 145462587Sitojunstatic void 1455171259Sdelphijnd6_dad_ns_input(struct ifaddr *ifa) 145653541Sshin{ 1457183550Szec INIT_VNET_INET6(curvnet); 145853541Sshin struct in6_ifaddr *ia; 145953541Sshin struct ifnet *ifp; 146078064Sume const struct in6_addr *taddr6; 146153541Sshin struct dadq *dp; 146253541Sshin int duplicate; 146353541Sshin 1464151465Ssuz if (ifa == NULL) 146553541Sshin panic("ifa == NULL in nd6_dad_ns_input"); 146653541Sshin 146753541Sshin ia = (struct in6_ifaddr *)ifa; 146853541Sshin ifp = ifa->ifa_ifp; 146953541Sshin taddr6 = &ia->ia_addr.sin6_addr; 147053541Sshin duplicate = 0; 147153541Sshin dp = nd6_dad_find(ifa); 147253541Sshin 147353541Sshin /* Quickhack - completely ignore DAD NS packets */ 1474181803Sbz if (V_dad_ignore_ns) { 1475165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 147678064Sume nd6log((LOG_INFO, 147778064Sume "nd6_dad_ns_input: ignoring DAD NS packet for " 1478165118Sbz "address %s(%s)\n", ip6_sprintf(ip6buf, taddr6), 147978064Sume if_name(ifa->ifa_ifp))); 148053541Sshin return; 148153541Sshin } 148253541Sshin 148353541Sshin /* 148453541Sshin * if I'm yet to start DAD, someone else started using this address 148553541Sshin * first. I have a duplicate and you win. 148653541Sshin */ 1487151465Ssuz if (dp == NULL || dp->dad_ns_ocount == 0) 148853541Sshin duplicate++; 148953541Sshin 149053541Sshin /* XXX more checks for loopback situation - see nd6_dad_timer too */ 149153541Sshin 149253541Sshin if (duplicate) { 149353541Sshin dp = NULL; /* will be freed in nd6_dad_duplicated() */ 149453541Sshin nd6_dad_duplicated(ifa); 149553541Sshin } else { 149653541Sshin /* 149753541Sshin * not sure if I got a duplicate. 149853541Sshin * increment ns count and see what happens. 149953541Sshin */ 150053541Sshin if (dp) 150153541Sshin dp->dad_ns_icount++; 150253541Sshin } 150353541Sshin} 150453541Sshin 150562587Sitojunstatic void 1506171259Sdelphijnd6_dad_na_input(struct ifaddr *ifa) 150753541Sshin{ 150853541Sshin struct dadq *dp; 150953541Sshin 1510151465Ssuz if (ifa == NULL) 151153541Sshin panic("ifa == NULL in nd6_dad_na_input"); 151253541Sshin 151353541Sshin dp = nd6_dad_find(ifa); 151453541Sshin if (dp) 151553541Sshin dp->dad_na_icount++; 151653541Sshin 151753541Sshin /* remove the address. */ 151853541Sshin nd6_dad_duplicated(ifa); 151953541Sshin} 1520