nd6_nbr.c revision 183550
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 183550 2008-10-02 15:37:58Z zec $"); 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> 4453541Sshin#include <sys/mbuf.h> 4553541Sshin#include <sys/socket.h> 4653541Sshin#include <sys/sockio.h> 4753541Sshin#include <sys/time.h> 4853541Sshin#include <sys/kernel.h> 4953541Sshin#include <sys/errno.h> 5053541Sshin#include <sys/syslog.h> 5153541Sshin#include <sys/queue.h> 5278064Sume#include <sys/callout.h> 53181803Sbz#include <sys/vimage.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> 6653541Sshin#include <netinet6/in6_var.h> 67151477Ssuz#include <netinet6/in6_ifattach.h> 6862587Sitojun#include <netinet/ip6.h> 6953541Sshin#include <netinet6/ip6_var.h> 70148385Sume#include <netinet6/scope6_var.h> 7153541Sshin#include <netinet6/nd6.h> 7262587Sitojun#include <netinet/icmp6.h> 7353541Sshin 74142215Sglebius#ifdef DEV_CARP 75142215Sglebius#include <netinet/ip_carp.h> 76142215Sglebius#endif 77142215Sglebius 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 *); 84175162Sobrienstatic void nd6_dad_timer(struct ifaddr *); 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 8962587Sitojunstatic int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/ 9062587Sitojunstatic int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */ 9153541Sshin 9253541Sshin/* 93108470Sschweikh * Input a Neighbor Solicitation Message. 9453541Sshin * 9553541Sshin * Based on RFC 2461 96148987Sume * Based on RFC 2462 (duplicate address detection) 9753541Sshin */ 9853541Sshinvoid 99171259Sdelphijnd6_ns_input(struct mbuf *m, int off, int icmp6len) 10053541Sshin{ 101183550Szec INIT_VNET_INET6(curvnet); 10253541Sshin struct ifnet *ifp = m->m_pkthdr.rcvif; 10353541Sshin struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 10462587Sitojun struct nd_neighbor_solicit *nd_ns; 10553541Sshin struct in6_addr saddr6 = ip6->ip6_src; 10653541Sshin struct in6_addr daddr6 = ip6->ip6_dst; 10762587Sitojun struct in6_addr taddr6; 10853541Sshin struct in6_addr myaddr6; 10953541Sshin char *lladdr = NULL; 110142215Sglebius struct ifaddr *ifa = NULL; 11153541Sshin int lladdrlen = 0; 11253541Sshin int anycast = 0, proxy = 0, tentative = 0; 11353541Sshin int tlladdr; 11453541Sshin union nd_opts ndopts; 11562587Sitojun struct sockaddr_dl *proxydl = NULL; 116165118Sbz char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 11753541Sshin 11878064Sume#ifndef PULLDOWN_TEST 11978064Sume IP6_EXTHDR_CHECK(m, off, icmp6len,); 12078064Sume nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off); 12178064Sume#else 12278064Sume IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len); 12378064Sume if (nd_ns == NULL) { 124181803Sbz V_icmp6stat.icp6s_tooshort++; 12578064Sume return; 12678064Sume } 12778064Sume#endif 12878064Sume ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */ 12978064Sume taddr6 = nd_ns->nd_ns_target; 130148385Sume if (in6_setscope(&taddr6, ifp, NULL) != 0) 131148385Sume goto bad; 13278064Sume 13353541Sshin if (ip6->ip6_hlim != 255) { 13478064Sume nd6log((LOG_ERR, 13578064Sume "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n", 136165118Sbz ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 137165118Sbz ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 13878064Sume goto bad; 13953541Sshin } 14053541Sshin 14153541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 142148987Sume /* dst has to be a solicited node multicast address. */ 143120941Sume if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL && 14495023Ssuz /* don't check ifindex portion */ 145120941Sume daddr6.s6_addr32[1] == 0 && 146120941Sume daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE && 147120941Sume daddr6.s6_addr8[12] == 0xff) { 14895023Ssuz ; /* good */ 14953541Sshin } else { 15078064Sume nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 151120941Sume "(wrong ip6 dst)\n")); 15253541Sshin goto bad; 15353541Sshin } 154183529Scperciva } else if (!nd6_onlink_ns_rfc4861) { 155183529Scperciva struct sockaddr_in6 src_sa6; 156183529Scperciva 157183529Scperciva /* 158183529Scperciva * According to recent IETF discussions, it is not a good idea 159183529Scperciva * to accept a NS from an address which would not be deemed 160183529Scperciva * to be a neighbor otherwise. This point is expected to be 161183529Scperciva * clarified in future revisions of the specification. 162183529Scperciva */ 163183529Scperciva bzero(&src_sa6, sizeof(src_sa6)); 164183529Scperciva src_sa6.sin6_family = AF_INET6; 165183529Scperciva src_sa6.sin6_len = sizeof(src_sa6); 166183529Scperciva src_sa6.sin6_addr = saddr6; 167183529Scperciva if (!nd6_is_addr_neighbor(&src_sa6, ifp)) { 168183529Scperciva nd6log((LOG_INFO, "nd6_ns_input: " 169183529Scperciva "NS packet from non-neighbor\n")); 170183529Scperciva goto bad; 171183529Scperciva } 17253541Sshin } 17353541Sshin 17453541Sshin if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 17578064Sume nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n")); 17653541Sshin goto bad; 17753541Sshin } 17853541Sshin 17953541Sshin icmp6len -= sizeof(*nd_ns); 18053541Sshin nd6_option_init(nd_ns + 1, icmp6len, &ndopts); 18153541Sshin if (nd6_options(&ndopts) < 0) { 18278064Sume nd6log((LOG_INFO, 18378064Sume "nd6_ns_input: invalid ND option, ignored\n")); 18478064Sume /* nd6_options have incremented stats */ 18578064Sume goto freeit; 18653541Sshin } 18753541Sshin 18853541Sshin if (ndopts.nd_opts_src_lladdr) { 18995023Ssuz lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 19053541Sshin lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 19153541Sshin } 192120941Sume 19353541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) { 19478064Sume nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 19578064Sume "(link-layer address option)\n")); 19653541Sshin goto bad; 19753541Sshin } 19853541Sshin 19953541Sshin /* 20053541Sshin * Attaching target link-layer address to the NA? 20153541Sshin * (RFC 2461 7.2.4) 20253541Sshin * 20353541Sshin * NS IP dst is unicast/anycast MUST NOT add 20453541Sshin * NS IP dst is solicited-node multicast MUST add 20553541Sshin * 20653541Sshin * In implementation, we add target link-layer address by default. 20753541Sshin * We do not add one in MUST NOT cases. 20853541Sshin */ 20953541Sshin if (!IN6_IS_ADDR_MULTICAST(&daddr6)) 21053541Sshin tlladdr = 0; 21153541Sshin else 21253541Sshin tlladdr = 1; 21353541Sshin 21453541Sshin /* 21553541Sshin * Target address (taddr6) must be either: 21653541Sshin * (1) Valid unicast/anycast address for my receiving interface, 21753541Sshin * (2) Unicast address for which I'm offering proxy service, or 21853541Sshin * (3) "tentative" address on which DAD is being performed. 21953541Sshin */ 22053541Sshin /* (1) and (3) check. */ 221142215Sglebius#ifdef DEV_CARP 222142215Sglebius if (ifp->if_carp) 223142215Sglebius ifa = carp_iamatch6(ifp->if_carp, &taddr6); 224151465Ssuz if (ifa == NULL) 225142215Sglebius ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 226142215Sglebius#else 22753541Sshin ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 228142215Sglebius#endif 22953541Sshin 23053541Sshin /* (2) check. */ 231151465Ssuz if (ifa == NULL) { 23253541Sshin struct rtentry *rt; 23353541Sshin struct sockaddr_in6 tsin6; 234121765Ssam int need_proxy; 235178167Sqingli#ifdef RADIX_MPATH 236178167Sqingli struct route_in6 ro; 237178167Sqingli#endif 23853541Sshin 239171260Sdelphij bzero(&tsin6, sizeof tsin6); 24053541Sshin tsin6.sin6_len = sizeof(struct sockaddr_in6); 24153541Sshin tsin6.sin6_family = AF_INET6; 24253541Sshin tsin6.sin6_addr = taddr6; 24353541Sshin 244178167Sqingli#ifdef RADIX_MPATH 245178167Sqingli bzero(&ro, sizeof(ro)); 246178167Sqingli ro.ro_dst = tsin6; 247178167Sqingli rtalloc_mpath((struct route *)&ro, RTF_ANNOUNCE); 248178167Sqingli rt = ro.ro_rt; 249178167Sqingli#else 25053541Sshin rt = rtalloc1((struct sockaddr *)&tsin6, 0, 0); 251178167Sqingli#endif 252121765Ssam need_proxy = (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 && 253121765Ssam rt->rt_gateway->sa_family == AF_LINK); 254121765Ssam if (rt) 255121765Ssam rtfree(rt); 256121765Ssam if (need_proxy) { 25753541Sshin /* 25862587Sitojun * proxy NDP for single entry 25953541Sshin */ 26062587Sitojun ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 26162587Sitojun IN6_IFF_NOTREADY|IN6_IFF_ANYCAST); 26262587Sitojun if (ifa) { 26353541Sshin proxy = 1; 26462587Sitojun proxydl = SDL(rt->rt_gateway); 26562587Sitojun } 26653541Sshin } 26753541Sshin } 268151479Ssuz if (ifa == NULL) { 26953541Sshin /* 27078064Sume * We've got an NS packet, and we don't have that adddress 27153541Sshin * assigned for us. We MUST silently ignore it. 27253541Sshin * See RFC2461 7.2.3. 27353541Sshin */ 27462587Sitojun goto freeit; 27553541Sshin } 27653541Sshin myaddr6 = *IFA_IN6(ifa); 27753541Sshin anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST; 27853541Sshin tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE; 27953541Sshin if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED) 28062587Sitojun goto freeit; 28153541Sshin 28253541Sshin if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 283120941Sume nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s " 28453541Sshin "(if %d, NS packet %d)\n", 285165118Sbz ip6_sprintf(ip6bufs, &taddr6), 286120941Sume ifp->if_addrlen, lladdrlen - 2)); 28778064Sume goto bad; 28853541Sshin } 28953541Sshin 29053541Sshin if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) { 291120941Sume nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n", 292165118Sbz ip6_sprintf(ip6bufs, &saddr6))); 29362587Sitojun goto freeit; 29453541Sshin } 29553541Sshin 29653541Sshin /* 29753541Sshin * We have neighbor solicitation packet, with target address equals to 29853541Sshin * one of my tentative address. 29953541Sshin * 30053541Sshin * src addr how to process? 30153541Sshin * --- --- 30253541Sshin * multicast of course, invalid (rejected in ip6_input) 30353541Sshin * unicast somebody is doing address resolution -> ignore 30453541Sshin * unspec dup address detection 30553541Sshin * 30653541Sshin * The processing is defined in RFC 2462. 30753541Sshin */ 30853541Sshin if (tentative) { 30953541Sshin /* 31053541Sshin * If source address is unspecified address, it is for 311148987Sume * duplicate address detection. 31253541Sshin * 31353541Sshin * If not, the packet is for addess resolution; 31453541Sshin * silently ignore it. 31553541Sshin */ 31653541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 31753541Sshin nd6_dad_ns_input(ifa); 31853541Sshin 31962587Sitojun goto freeit; 32053541Sshin } 32153541Sshin 32253541Sshin /* 32353541Sshin * If the source address is unspecified address, entries must not 32453541Sshin * be created or updated. 32553541Sshin * It looks that sender is performing DAD. Output NA toward 32653541Sshin * all-node multicast address, to tell the sender that I'm using 32753541Sshin * the address. 32853541Sshin * S bit ("solicited") must be zero. 32953541Sshin */ 33053541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 331148385Sume struct in6_addr in6_all; 332148385Sume 333148385Sume in6_all = in6addr_linklocal_allnodes; 334148385Sume if (in6_setscope(&in6_all, ifp, NULL) != 0) 335148385Sume goto bad; 336148385Sume nd6_na_output(ifp, &in6_all, &taddr6, 337120941Sume ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 338181803Sbz (V_ip6_forwarding ? ND_NA_FLAG_ROUTER : 0), 339120941Sume tlladdr, (struct sockaddr *)proxydl); 34062587Sitojun goto freeit; 34153541Sshin } 34253541Sshin 343120941Sume nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, 344120941Sume ND_NEIGHBOR_SOLICIT, 0); 34553541Sshin 34653541Sshin nd6_na_output(ifp, &saddr6, &taddr6, 347120941Sume ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 348181803Sbz (V_ip6_forwarding ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED, 349120941Sume tlladdr, (struct sockaddr *)proxydl); 35062587Sitojun freeit: 35162587Sitojun m_freem(m); 35253541Sshin return; 35353541Sshin 35453541Sshin bad: 355165118Sbz nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", 356165118Sbz ip6_sprintf(ip6bufs, &saddr6))); 357165118Sbz nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", 358165118Sbz ip6_sprintf(ip6bufs, &daddr6))); 359165118Sbz nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", 360165118Sbz ip6_sprintf(ip6bufs, &taddr6))); 361181803Sbz V_icmp6stat.icp6s_badns++; 36262587Sitojun m_freem(m); 36353541Sshin} 36453541Sshin 36553541Sshin/* 366108470Sschweikh * Output a Neighbor Solicitation Message. Caller specifies: 36753541Sshin * - ICMP6 header source IP6 address 36853541Sshin * - ND6 header target IP6 address 36953541Sshin * - ND6 header source datalink address 37053541Sshin * 37153541Sshin * Based on RFC 2461 372148987Sume * Based on RFC 2462 (duplicate address detection) 373171259Sdelphij * 374171259Sdelphij * ln - for source address determination 375171259Sdelphij * dad - duplicate address detection 37653541Sshin */ 37753541Sshinvoid 378171259Sdelphijnd6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6, 379171259Sdelphij const struct in6_addr *taddr6, struct llinfo_nd6 *ln, int dad) 38053541Sshin{ 381183550Szec INIT_VNET_INET6(ifp->if_vnet); 38253541Sshin struct mbuf *m; 38353541Sshin struct ip6_hdr *ip6; 38453541Sshin struct nd_neighbor_solicit *nd_ns; 385148385Sume struct in6_addr *src, src_in; 38653541Sshin struct ip6_moptions im6o; 38753541Sshin int icmp6len; 38862587Sitojun int maxlen; 38953541Sshin caddr_t mac; 390148385Sume struct route_in6 ro; 391120941Sume 392148385Sume bzero(&ro, sizeof(ro)); 393148385Sume 39453541Sshin if (IN6_IS_ADDR_MULTICAST(taddr6)) 39553541Sshin return; 39653541Sshin 39762587Sitojun /* estimate the size of message */ 39862587Sitojun maxlen = sizeof(*ip6) + sizeof(*nd_ns); 39962587Sitojun maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 40062587Sitojun if (max_linkhdr + maxlen >= MCLBYTES) { 40162587Sitojun#ifdef DIAGNOSTIC 40262587Sitojun printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES " 40362587Sitojun "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 40462587Sitojun#endif 40553541Sshin return; 40662587Sitojun } 40753541Sshin 408111119Simp MGETHDR(m, M_DONTWAIT, MT_DATA); 40962587Sitojun if (m && max_linkhdr + maxlen >= MHLEN) { 410111119Simp MCLGET(m, M_DONTWAIT); 41162587Sitojun if ((m->m_flags & M_EXT) == 0) { 41262587Sitojun m_free(m); 41362587Sitojun m = NULL; 41462587Sitojun } 41562587Sitojun } 41662587Sitojun if (m == NULL) 41762587Sitojun return; 41878064Sume m->m_pkthdr.rcvif = NULL; 41962587Sitojun 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) { 45253541Sshin /* 45353541Sshin * RFC2461 7.2.2: 45453541Sshin * "If the source address of the packet prompting the 45553541Sshin * solicitation is the same as one of the addresses assigned 45653541Sshin * to the outgoing interface, that address SHOULD be placed 45753541Sshin * in the IP Source Address of the outgoing solicitation. 45853541Sshin * Otherwise, any one of the addresses assigned to the 45953541Sshin * interface should be used." 46053541Sshin * 46153541Sshin * We use the source address for the prompting packet 46253541Sshin * (saddr6), if: 46353541Sshin * - saddr6 is given from the caller (by giving "ln"), and 46453541Sshin * - saddr6 belongs to the outgoing interface. 465148385Sume * Otherwise, we perform the source address selection as usual. 46653541Sshin */ 46795023Ssuz struct ip6_hdr *hip6; /* hold ip6 */ 468148385Sume struct in6_addr *hsrc = NULL; 46953541Sshin 47053541Sshin if (ln && ln->ln_hold) { 471148987Sume /* 472148987Sume * assuming every packet in ln_hold has the same IP 473148987Sume * header 474148987Sume */ 47553541Sshin hip6 = mtod(ln->ln_hold, struct ip6_hdr *); 47653541Sshin /* XXX pullup? */ 47753541Sshin if (sizeof(*hip6) < ln->ln_hold->m_len) 478148385Sume hsrc = &hip6->ip6_src; 47953541Sshin else 480148385Sume hsrc = NULL; 481148385Sume } 482148385Sume if (hsrc && in6ifa_ifpwithaddr(ifp, hsrc)) 483148385Sume src = hsrc; 48453541Sshin else { 485148385Sume int error; 486148385Sume struct sockaddr_in6 dst_sa; 487148385Sume 488148385Sume bzero(&dst_sa, sizeof(dst_sa)); 489148385Sume dst_sa.sin6_family = AF_INET6; 490148385Sume dst_sa.sin6_len = sizeof(dst_sa); 491148385Sume dst_sa.sin6_addr = ip6->ip6_dst; 492148385Sume 493148385Sume src = in6_selectsrc(&dst_sa, NULL, 494148385Sume NULL, &ro, NULL, NULL, &error); 495148385Sume if (src == NULL) { 496165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 497148385Sume nd6log((LOG_DEBUG, 498148385Sume "nd6_ns_output: source can't be " 499148385Sume "determined: dst=%s, error=%d\n", 500165118Sbz ip6_sprintf(ip6buf, &dst_sa.sin6_addr), 501165118Sbz error)); 502148385Sume goto bad; 50353541Sshin } 50453541Sshin } 50553541Sshin } else { 50653541Sshin /* 50753541Sshin * Source address for DAD packet must always be IPv6 50853541Sshin * unspecified address. (0::0) 509148385Sume * We actually don't have to 0-clear the address (we did it 510148385Sume * above), but we do so here explicitly to make the intention 511148385Sume * clearer. 51253541Sshin */ 513148385Sume bzero(&src_in, sizeof(src_in)); 514148385Sume src = &src_in; 51553541Sshin } 516148385Sume ip6->ip6_src = *src; 51753541Sshin nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1); 51853541Sshin nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT; 51953541Sshin nd_ns->nd_ns_code = 0; 52053541Sshin nd_ns->nd_ns_reserved = 0; 52153541Sshin nd_ns->nd_ns_target = *taddr6; 522121315Sume in6_clearscope(&nd_ns->nd_ns_target); /* XXX */ 52353541Sshin 52453541Sshin /* 52553541Sshin * Add source link-layer address option. 52653541Sshin * 52753541Sshin * spec implementation 52853541Sshin * --- --- 52953541Sshin * DAD packet MUST NOT do not add the option 53053541Sshin * there's no link layer address: 53153541Sshin * impossible do not add the option 53253541Sshin * there's link layer address: 53353541Sshin * Multicast NS MUST add one add the option 53453541Sshin * Unicast NS SHOULD add one add the option 53553541Sshin */ 53653541Sshin if (!dad && (mac = nd6_ifptomac(ifp))) { 53753541Sshin int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 53853541Sshin struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); 53953541Sshin /* 8 byte alignments... */ 54053541Sshin optlen = (optlen + 7) & ~7; 541120941Sume 54253541Sshin m->m_pkthdr.len += optlen; 54353541Sshin m->m_len += optlen; 54453541Sshin icmp6len += optlen; 54553541Sshin bzero((caddr_t)nd_opt, optlen); 54653541Sshin nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; 54753541Sshin nd_opt->nd_opt_len = optlen >> 3; 54853541Sshin bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 54953541Sshin } 55053541Sshin 55153541Sshin ip6->ip6_plen = htons((u_short)icmp6len); 55253541Sshin nd_ns->nd_ns_cksum = 0; 553120941Sume nd_ns->nd_ns_cksum = 554120941Sume in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len); 55553541Sshin 556151536Ssuz ip6_output(m, NULL, &ro, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL, NULL); 557148385Sume icmp6_ifstat_inc(ifp, ifs6_out_msg); 558148385Sume icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit); 559181803Sbz V_icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++; 560148385Sume 561148385Sume if (ro.ro_rt) { /* we don't cache this route. */ 562148385Sume RTFREE(ro.ro_rt); 56353541Sshin } 564148385Sume return; 565148385Sume 566148385Sume bad: 567148385Sume if (ro.ro_rt) { 568148385Sume RTFREE(ro.ro_rt); 569148385Sume } 570148385Sume m_freem(m); 571148385Sume return; 57253541Sshin} 57353541Sshin 57453541Sshin/* 57553541Sshin * Neighbor advertisement input handling. 57653541Sshin * 57753541Sshin * Based on RFC 2461 578148987Sume * Based on RFC 2462 (duplicate address detection) 57962587Sitojun * 58062587Sitojun * the following items are not implemented yet: 58162587Sitojun * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 58262587Sitojun * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 58353541Sshin */ 58453541Sshinvoid 585171259Sdelphijnd6_na_input(struct mbuf *m, int off, int icmp6len) 58653541Sshin{ 587183550Szec INIT_VNET_INET6(curvnet); 58853541Sshin struct ifnet *ifp = m->m_pkthdr.rcvif; 58953541Sshin struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 59062587Sitojun struct nd_neighbor_advert *nd_na; 59153541Sshin struct in6_addr daddr6 = ip6->ip6_dst; 59262587Sitojun struct in6_addr taddr6; 59362587Sitojun int flags; 59462587Sitojun int is_router; 59562587Sitojun int is_solicited; 59662587Sitojun int is_override; 59753541Sshin char *lladdr = NULL; 59853541Sshin int lladdrlen = 0; 59953541Sshin struct ifaddr *ifa; 60053541Sshin struct llinfo_nd6 *ln; 60153541Sshin struct rtentry *rt; 60253541Sshin struct sockaddr_dl *sdl; 60353541Sshin union nd_opts ndopts; 604165118Sbz char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 60553541Sshin 60653541Sshin if (ip6->ip6_hlim != 255) { 60778064Sume nd6log((LOG_ERR, 60878064Sume "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n", 609165118Sbz ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 610165118Sbz ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 61178064Sume goto bad; 61262587Sitojun } 61362587Sitojun 61462587Sitojun#ifndef PULLDOWN_TEST 61562587Sitojun IP6_EXTHDR_CHECK(m, off, icmp6len,); 61662587Sitojun nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off); 61762587Sitojun#else 61862587Sitojun IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len); 61962587Sitojun if (nd_na == NULL) { 620181803Sbz V_icmp6stat.icp6s_tooshort++; 62153541Sshin return; 62253541Sshin } 62362587Sitojun#endif 624148385Sume 62562587Sitojun flags = nd_na->nd_na_flags_reserved; 62662587Sitojun is_router = ((flags & ND_NA_FLAG_ROUTER) != 0); 62762587Sitojun is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0); 62862587Sitojun is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0); 62953541Sshin 630148385Sume taddr6 = nd_na->nd_na_target; 631148385Sume if (in6_setscope(&taddr6, ifp, NULL)) 632150202Ssuz goto bad; /* XXX: impossible */ 63353541Sshin 63453541Sshin if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 63578064Sume nd6log((LOG_ERR, 63653541Sshin "nd6_na_input: invalid target address %s\n", 637165118Sbz ip6_sprintf(ip6bufs, &taddr6))); 63878064Sume goto bad; 63953541Sshin } 64053541Sshin if (IN6_IS_ADDR_MULTICAST(&daddr6)) 64153541Sshin if (is_solicited) { 64278064Sume nd6log((LOG_ERR, 64378064Sume "nd6_na_input: a solicited adv is multicasted\n")); 64478064Sume goto bad; 64553541Sshin } 64653541Sshin 64753541Sshin icmp6len -= sizeof(*nd_na); 64853541Sshin nd6_option_init(nd_na + 1, icmp6len, &ndopts); 64953541Sshin if (nd6_options(&ndopts) < 0) { 65078064Sume nd6log((LOG_INFO, 65178064Sume "nd6_na_input: invalid ND option, ignored\n")); 65278064Sume /* nd6_options have incremented stats */ 65362587Sitojun goto freeit; 65453541Sshin } 65553541Sshin 65653541Sshin if (ndopts.nd_opts_tgt_lladdr) { 65753541Sshin lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 65853541Sshin lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 65953541Sshin } 66053541Sshin 66153541Sshin ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 66253541Sshin 66353541Sshin /* 66453541Sshin * Target address matches one of my interface address. 66553541Sshin * 66653541Sshin * If my address is tentative, this means that there's somebody 66753541Sshin * already using the same address as mine. This indicates DAD failure. 66853541Sshin * This is defined in RFC 2462. 66953541Sshin * 67053541Sshin * Otherwise, process as defined in RFC 2461. 67153541Sshin */ 67253541Sshin if (ifa 67353541Sshin && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) { 67453541Sshin nd6_dad_na_input(ifa); 67562587Sitojun goto freeit; 67653541Sshin } 67753541Sshin 67895023Ssuz /* Just for safety, maybe unnecessary. */ 67953541Sshin if (ifa) { 68053541Sshin log(LOG_ERR, 68153541Sshin "nd6_na_input: duplicate IP6 address %s\n", 682165118Sbz ip6_sprintf(ip6bufs, &taddr6)); 68362587Sitojun goto freeit; 68453541Sshin } 68553541Sshin 68653541Sshin if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 687120941Sume nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s " 688165118Sbz "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6), 689120941Sume ifp->if_addrlen, lladdrlen - 2)); 69078064Sume goto bad; 69153541Sshin } 69253541Sshin 69353541Sshin /* 694120941Sume * If no neighbor cache entry is found, NA SHOULD silently be 695120941Sume * discarded. 69653541Sshin */ 69753541Sshin rt = nd6_lookup(&taddr6, 0, ifp); 69853541Sshin if ((rt == NULL) || 69953541Sshin ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) || 70053541Sshin ((sdl = SDL(rt->rt_gateway)) == NULL)) 70162587Sitojun goto freeit; 70253541Sshin 70353541Sshin if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 70453541Sshin /* 70553541Sshin * If the link-layer has address, and no lladdr option came, 70653541Sshin * discard the packet. 70753541Sshin */ 708151465Ssuz if (ifp->if_addrlen && lladdr == NULL) 70962587Sitojun goto freeit; 71053541Sshin 71153541Sshin /* 71253541Sshin * Record link-layer address, and update the state. 71353541Sshin */ 71453541Sshin sdl->sdl_alen = ifp->if_addrlen; 71553541Sshin bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 71653541Sshin if (is_solicited) { 71753541Sshin ln->ln_state = ND6_LLINFO_REACHABLE; 71862587Sitojun ln->ln_byhint = 0; 719151539Ssuz if (!ND6_LLINFO_PERMANENT(ln)) { 720151539Ssuz nd6_llinfo_settimer(ln, 721151539Ssuz (long)ND_IFINFO(rt->rt_ifp)->reachable * hz); 722120941Sume } 72378064Sume } else { 72453541Sshin ln->ln_state = ND6_LLINFO_STALE; 725181803Sbz nd6_llinfo_settimer(ln, (long)V_nd6_gctimer * hz); 72678064Sume } 72778064Sume if ((ln->ln_router = is_router) != 0) { 72878064Sume /* 72978064Sume * This means a router's state has changed from 73078064Sume * non-reachable to probably reachable, and might 73178064Sume * affect the status of associated prefixes.. 73278064Sume */ 73378064Sume pfxlist_onlink_check(); 73478064Sume } 73553541Sshin } else { 73653541Sshin int llchange; 73753541Sshin 73853541Sshin /* 73953541Sshin * Check if the link-layer address has changed or not. 74053541Sshin */ 741151465Ssuz if (lladdr == NULL) 74253541Sshin llchange = 0; 74353541Sshin else { 74453541Sshin if (sdl->sdl_alen) { 74553541Sshin if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 74653541Sshin llchange = 1; 74753541Sshin else 74853541Sshin llchange = 0; 74953541Sshin } else 75053541Sshin llchange = 1; 75153541Sshin } 75253541Sshin 75353541Sshin /* 75453541Sshin * This is VERY complex. Look at it with care. 75553541Sshin * 75653541Sshin * override solicit lladdr llchange action 75753541Sshin * (L: record lladdr) 75853541Sshin * 75953541Sshin * 0 0 n -- (2c) 76053541Sshin * 0 0 y n (2b) L 76153541Sshin * 0 0 y y (1) REACHABLE->STALE 76253541Sshin * 0 1 n -- (2c) *->REACHABLE 76353541Sshin * 0 1 y n (2b) L *->REACHABLE 76453541Sshin * 0 1 y y (1) REACHABLE->STALE 76553541Sshin * 1 0 n -- (2a) 76653541Sshin * 1 0 y n (2a) L 76753541Sshin * 1 0 y y (2a) L *->STALE 76853541Sshin * 1 1 n -- (2a) *->REACHABLE 76953541Sshin * 1 1 y n (2a) L *->REACHABLE 77053541Sshin * 1 1 y y (2a) L *->REACHABLE 77153541Sshin */ 772151539Ssuz if (!is_override && (lladdr != NULL && llchange)) { /* (1) */ 77353541Sshin /* 77453541Sshin * If state is REACHABLE, make it STALE. 77553541Sshin * no other updates should be done. 77653541Sshin */ 77778064Sume if (ln->ln_state == ND6_LLINFO_REACHABLE) { 77853541Sshin ln->ln_state = ND6_LLINFO_STALE; 779181803Sbz nd6_llinfo_settimer(ln, (long)V_nd6_gctimer * hz); 78078064Sume } 78162587Sitojun goto freeit; 78253541Sshin } else if (is_override /* (2a) */ 783151465Ssuz || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */ 784151465Ssuz || lladdr == NULL) { /* (2c) */ 78553541Sshin /* 78653541Sshin * Update link-local address, if any. 78753541Sshin */ 788151465Ssuz if (lladdr != NULL) { 78953541Sshin sdl->sdl_alen = ifp->if_addrlen; 79053541Sshin bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 79153541Sshin } 79253541Sshin 79353541Sshin /* 79453541Sshin * If solicited, make the state REACHABLE. 79553541Sshin * If not solicited and the link-layer address was 79653541Sshin * changed, make it STALE. 79753541Sshin */ 79853541Sshin if (is_solicited) { 79953541Sshin ln->ln_state = ND6_LLINFO_REACHABLE; 80062587Sitojun ln->ln_byhint = 0; 801151539Ssuz if (!ND6_LLINFO_PERMANENT(ln)) { 802151539Ssuz nd6_llinfo_settimer(ln, 803151539Ssuz (long)ND_IFINFO(ifp)->reachable * hz); 80453541Sshin } 80553541Sshin } else { 806151465Ssuz if (lladdr != NULL && llchange) { 80753541Sshin ln->ln_state = ND6_LLINFO_STALE; 808151539Ssuz nd6_llinfo_settimer(ln, 809181803Sbz (long)V_nd6_gctimer * hz); 81078064Sume } 81153541Sshin } 81253541Sshin } 81353541Sshin 81453541Sshin if (ln->ln_router && !is_router) { 81553541Sshin /* 81653541Sshin * The peer dropped the router flag. 81753541Sshin * Remove the sender from the Default Router List and 81853541Sshin * update the Destination Cache entries. 81953541Sshin */ 82053541Sshin struct nd_defrouter *dr; 82153541Sshin struct in6_addr *in6; 82253541Sshin int s; 82353541Sshin 82453541Sshin in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr; 82595023Ssuz 82695023Ssuz /* 82795023Ssuz * Lock to protect the default router list. 82895023Ssuz * XXX: this might be unnecessary, since this function 82995023Ssuz * is only called under the network software interrupt 830120941Sume * context. However, we keep it just for safety. 83195023Ssuz */ 83253541Sshin s = splnet(); 833128422Sluigi dr = defrouter_lookup(in6, ifp); 83453541Sshin if (dr) 83553541Sshin defrtrlist_del(dr); 836181803Sbz else if (!V_ip6_forwarding) { 83753541Sshin /* 83853541Sshin * Even if the neighbor is not in the default 83953541Sshin * router list, the neighbor may be used 84053541Sshin * as a next hop for some destinations 84153541Sshin * (e.g. redirect case). So we must 84253541Sshin * call rt6_flush explicitly. 84353541Sshin */ 844128422Sluigi rt6_flush(&ip6->ip6_src, ifp); 84553541Sshin } 84653541Sshin splx(s); 84753541Sshin } 84853541Sshin ln->ln_router = is_router; 84953541Sshin } 85053541Sshin rt->rt_flags &= ~RTF_REJECT; 85153541Sshin ln->ln_asked = 0; 85253541Sshin if (ln->ln_hold) { 853151539Ssuz struct mbuf *m_hold, *m_hold_next; 854151539Ssuz 855169273Ssuz /* 856169273Ssuz * reset the ln_hold in advance, to explicitly 857169273Ssuz * prevent a ln_hold lookup in nd6_output() 858169273Ssuz * (wouldn't happen, though...) 859169273Ssuz */ 860171133Sgnn for (m_hold = ln->ln_hold; 861169241Ssuz m_hold; m_hold = m_hold_next) { 862151539Ssuz m_hold_next = m_hold->m_nextpkt; 863169241Ssuz m_hold->m_nextpkt = NULL; 864151539Ssuz /* 865151539Ssuz * we assume ifp is not a loopback here, so just set 866151539Ssuz * the 2nd argument as the 1st one. 867151539Ssuz */ 868169241Ssuz nd6_output(ifp, ifp, m_hold, 869151539Ssuz (struct sockaddr_in6 *)rt_key(rt), rt); 870151539Ssuz } 871171133Sgnn ln->ln_hold = NULL; 87253541Sshin } 87362587Sitojun 87462587Sitojun freeit: 87562587Sitojun m_freem(m); 87678064Sume return; 87778064Sume 87878064Sume bad: 879181803Sbz V_icmp6stat.icp6s_badna++; 88078064Sume m_freem(m); 88153541Sshin} 88253541Sshin 88353541Sshin/* 88453541Sshin * Neighbor advertisement output handling. 88553541Sshin * 88653541Sshin * Based on RFC 2461 88753541Sshin * 88862587Sitojun * the following items are not implemented yet: 88962587Sitojun * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 89062587Sitojun * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 891171259Sdelphij * 892171259Sdelphij * tlladdr - 1 if include target link-layer address 893171259Sdelphij * sdl0 - sockaddr_dl (= proxy NA) or NULL 89453541Sshin */ 89553541Sshinvoid 896171259Sdelphijnd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0, 897171259Sdelphij const struct in6_addr *taddr6, u_long flags, int tlladdr, 898171259Sdelphij struct sockaddr *sdl0) 89953541Sshin{ 900183550Szec INIT_VNET_INET6(ifp->if_vnet); 90153541Sshin struct mbuf *m; 90253541Sshin struct ip6_hdr *ip6; 90353541Sshin struct nd_neighbor_advert *nd_na; 90453541Sshin struct ip6_moptions im6o; 905148385Sume struct in6_addr *src, daddr6; 906148385Sume struct sockaddr_in6 dst_sa; 907148385Sume int icmp6len, maxlen, error; 90892733Speter caddr_t mac = NULL; 909148385Sume struct route_in6 ro; 91062587Sitojun 911148385Sume bzero(&ro, sizeof(ro)); 912148385Sume 913148385Sume daddr6 = *daddr6_0; /* make a local copy for modification */ 914148385Sume 91562587Sitojun /* estimate the size of message */ 91662587Sitojun maxlen = sizeof(*ip6) + sizeof(*nd_na); 91762587Sitojun maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 91862587Sitojun if (max_linkhdr + maxlen >= MCLBYTES) { 91962587Sitojun#ifdef DIAGNOSTIC 92062587Sitojun printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES " 92162587Sitojun "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 92262587Sitojun#endif 92353541Sshin return; 92462587Sitojun } 92553541Sshin 926111119Simp MGETHDR(m, M_DONTWAIT, MT_DATA); 92762587Sitojun if (m && max_linkhdr + maxlen >= MHLEN) { 928111119Simp MCLGET(m, M_DONTWAIT); 92962587Sitojun if ((m->m_flags & M_EXT) == 0) { 93062587Sitojun m_free(m); 93162587Sitojun m = NULL; 93262587Sitojun } 93362587Sitojun } 93462587Sitojun if (m == NULL) 93562587Sitojun return; 93678064Sume m->m_pkthdr.rcvif = NULL; 93762587Sitojun 938148385Sume if (IN6_IS_ADDR_MULTICAST(&daddr6)) { 93953541Sshin m->m_flags |= M_MCAST; 94053541Sshin im6o.im6o_multicast_ifp = ifp; 94153541Sshin im6o.im6o_multicast_hlim = 255; 94253541Sshin im6o.im6o_multicast_loop = 0; 94353541Sshin } 94453541Sshin 94553541Sshin icmp6len = sizeof(*nd_na); 94653541Sshin m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len; 94795023Ssuz m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 94853541Sshin 94953541Sshin /* fill neighbor advertisement packet */ 95053541Sshin ip6 = mtod(m, struct ip6_hdr *); 95153541Sshin ip6->ip6_flow = 0; 95262587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 95362587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 95453541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 95553541Sshin ip6->ip6_hlim = 255; 956148385Sume if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) { 95753541Sshin /* reply to DAD */ 958153227Sume daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 959153227Sume daddr6.s6_addr16[1] = 0; 960153227Sume daddr6.s6_addr32[1] = 0; 961153227Sume daddr6.s6_addr32[2] = 0; 962153227Sume daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE; 963148385Sume if (in6_setscope(&daddr6, ifp, NULL)) 964148385Sume goto bad; 965148385Sume 96653541Sshin flags &= ~ND_NA_FLAG_SOLICITED; 967148385Sume } 968148385Sume ip6->ip6_dst = daddr6; 969148385Sume bzero(&dst_sa, sizeof(struct sockaddr_in6)); 970148385Sume dst_sa.sin6_family = AF_INET6; 971148385Sume dst_sa.sin6_len = sizeof(struct sockaddr_in6); 972148385Sume dst_sa.sin6_addr = daddr6; 97353541Sshin 97453541Sshin /* 97553541Sshin * Select a source whose scope is the same as that of the dest. 97653541Sshin */ 977148385Sume bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa)); 978148385Sume src = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, NULL, &error); 979148385Sume if (src == NULL) { 980165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 981148385Sume nd6log((LOG_DEBUG, "nd6_na_output: source can't be " 982148385Sume "determined: dst=%s, error=%d\n", 983165118Sbz ip6_sprintf(ip6buf, &dst_sa.sin6_addr), error)); 984148385Sume goto bad; 98553541Sshin } 986148385Sume ip6->ip6_src = *src; 98753541Sshin nd_na = (struct nd_neighbor_advert *)(ip6 + 1); 98853541Sshin nd_na->nd_na_type = ND_NEIGHBOR_ADVERT; 98953541Sshin nd_na->nd_na_code = 0; 99053541Sshin nd_na->nd_na_target = *taddr6; 991121315Sume in6_clearscope(&nd_na->nd_na_target); /* XXX */ 99253541Sshin 99353541Sshin /* 99453541Sshin * "tlladdr" indicates NS's condition for adding tlladdr or not. 99553541Sshin * see nd6_ns_input() for details. 99653541Sshin * Basically, if NS packet is sent to unicast/anycast addr, 99753541Sshin * target lladdr option SHOULD NOT be included. 99853541Sshin */ 99962587Sitojun if (tlladdr) { 100062587Sitojun /* 100162587Sitojun * sdl0 != NULL indicates proxy NA. If we do proxy, use 100262587Sitojun * lladdr in sdl0. If we are not proxying (sending NA for 100362587Sitojun * my address) use lladdr configured for the interface. 100462587Sitojun */ 1005142215Sglebius if (sdl0 == NULL) { 1006142215Sglebius#ifdef DEV_CARP 1007142215Sglebius if (ifp->if_carp) 1008142215Sglebius mac = carp_macmatch6(ifp->if_carp, m, taddr6); 1009142215Sglebius if (mac == NULL) 1010142215Sglebius mac = nd6_ifptomac(ifp); 1011142215Sglebius#else 101262587Sitojun mac = nd6_ifptomac(ifp); 1013142215Sglebius#endif 1014142215Sglebius } else if (sdl0->sa_family == AF_LINK) { 101562587Sitojun struct sockaddr_dl *sdl; 101662587Sitojun sdl = (struct sockaddr_dl *)sdl0; 101762587Sitojun if (sdl->sdl_alen == ifp->if_addrlen) 101862587Sitojun mac = LLADDR(sdl); 101962587Sitojun } 102062587Sitojun } 102162587Sitojun if (tlladdr && mac) { 102253541Sshin int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 102353541Sshin struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1); 1024120941Sume 102553541Sshin /* roundup to 8 bytes alignment! */ 102653541Sshin optlen = (optlen + 7) & ~7; 102753541Sshin 102853541Sshin m->m_pkthdr.len += optlen; 102953541Sshin m->m_len += optlen; 103053541Sshin icmp6len += optlen; 103153541Sshin bzero((caddr_t)nd_opt, optlen); 103253541Sshin nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 103353541Sshin nd_opt->nd_opt_len = optlen >> 3; 103453541Sshin bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 103553541Sshin } else 103653541Sshin flags &= ~ND_NA_FLAG_OVERRIDE; 103753541Sshin 103853541Sshin ip6->ip6_plen = htons((u_short)icmp6len); 103953541Sshin nd_na->nd_na_flags_reserved = flags; 104053541Sshin nd_na->nd_na_cksum = 0; 104153541Sshin nd_na->nd_na_cksum = 1042120941Sume in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len); 104353541Sshin 1044148385Sume ip6_output(m, NULL, &ro, 0, &im6o, NULL, NULL); 1045148385Sume icmp6_ifstat_inc(ifp, ifs6_out_msg); 1046148385Sume icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert); 1047181803Sbz V_icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++; 1048148385Sume 1049148385Sume if (ro.ro_rt) { /* we don't cache this route. */ 1050148385Sume RTFREE(ro.ro_rt); 105153541Sshin } 1052148385Sume return; 1053148385Sume 1054148385Sume bad: 1055148385Sume if (ro.ro_rt) { 1056148385Sume RTFREE(ro.ro_rt); 1057148385Sume } 1058148385Sume m_freem(m); 1059148385Sume return; 106053541Sshin} 106153541Sshin 106253541Sshincaddr_t 1063171259Sdelphijnd6_ifptomac(struct ifnet *ifp) 106453541Sshin{ 106553541Sshin switch (ifp->if_type) { 106653541Sshin case IFT_ARCNET: 106753541Sshin case IFT_ETHER: 106853541Sshin case IFT_FDDI: 106978064Sume case IFT_IEEE1394: 107078468Ssumikawa#ifdef IFT_L2VLAN 107178468Ssumikawa case IFT_L2VLAN: 107278468Ssumikawa#endif 107378064Sume#ifdef IFT_IEEE80211 107478064Sume case IFT_IEEE80211: 107578064Sume#endif 1076142215Sglebius#ifdef IFT_CARP 1077142215Sglebius case IFT_CARP: 1078142215Sglebius#endif 1079149829Sthompsa case IFT_BRIDGE: 1080120049Smdodd case IFT_ISO88025: 1081147306Sbrooks return IF_LLADDR(ifp); 108253541Sshin default: 108353541Sshin return NULL; 108453541Sshin } 108553541Sshin} 108653541Sshin 108760938SjakeTAILQ_HEAD(dadq_head, dadq); 108853541Sshinstruct dadq { 108960938Sjake TAILQ_ENTRY(dadq) dad_list; 109053541Sshin struct ifaddr *dad_ifa; 109153541Sshin int dad_count; /* max NS to send */ 109262587Sitojun int dad_ns_tcount; /* # of trials to send NS */ 109353541Sshin int dad_ns_ocount; /* NS sent so far */ 109453541Sshin int dad_ns_icount; 109553541Sshin int dad_na_icount; 109678064Sume struct callout dad_timer_ch; 109753541Sshin}; 109853541Sshin 109953541Sshinstatic struct dadq_head dadq; 110078064Sumestatic int dad_init = 0; 110153541Sshin 110253541Sshinstatic struct dadq * 1103171259Sdelphijnd6_dad_find(struct ifaddr *ifa) 110453541Sshin{ 1105183550Szec INIT_VNET_INET6(curvnet); 110653541Sshin struct dadq *dp; 110753541Sshin 1108181803Sbz for (dp = V_dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) { 110953541Sshin if (dp->dad_ifa == ifa) 111053541Sshin return dp; 111153541Sshin } 111253541Sshin return NULL; 111353541Sshin} 111453541Sshin 111578064Sumestatic void 1116171259Sdelphijnd6_dad_starttimer(struct dadq *dp, int ticks) 111778064Sume{ 111878064Sume 111978064Sume callout_reset(&dp->dad_timer_ch, ticks, 1120175162Sobrien (void (*)(void *))nd6_dad_timer, (void *)dp->dad_ifa); 112178064Sume} 112278064Sume 112378064Sumestatic void 1124171259Sdelphijnd6_dad_stoptimer(struct dadq *dp) 112578064Sume{ 112678064Sume 112778064Sume callout_stop(&dp->dad_timer_ch); 112878064Sume} 112978064Sume 113053541Sshin/* 1131148987Sume * Start Duplicate Address Detection (DAD) for specified interface address. 113253541Sshin */ 113353541Sshinvoid 1134171259Sdelphijnd6_dad_start(struct ifaddr *ifa, int delay) 113553541Sshin{ 1136183550Szec INIT_VNET_INET6(curvnet); 113753541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 113853541Sshin struct dadq *dp; 1139165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 114053541Sshin 1141181803Sbz if (!V_dad_init) { 1142181803Sbz TAILQ_INIT(&V_dadq); 1143181803Sbz V_dad_init++; 114453541Sshin } 114553541Sshin 114653541Sshin /* 114753541Sshin * If we don't need DAD, don't do it. 114853541Sshin * There are several cases: 114953541Sshin * - DAD is disabled (ip6_dad_count == 0) 115053541Sshin * - the interface address is anycast 115153541Sshin */ 115253541Sshin if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) { 115362587Sitojun log(LOG_DEBUG, 115462587Sitojun "nd6_dad_start: called with non-tentative address " 115553541Sshin "%s(%s)\n", 1156165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 115753541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 115853541Sshin return; 115953541Sshin } 116053541Sshin if (ia->ia6_flags & IN6_IFF_ANYCAST) { 116153541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 116253541Sshin return; 116353541Sshin } 1164181803Sbz if (!V_ip6_dad_count) { 116553541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 116653541Sshin return; 116753541Sshin } 1168151465Ssuz if (ifa->ifa_ifp == NULL) 116953541Sshin panic("nd6_dad_start: ifa->ifa_ifp == NULL"); 1170120941Sume if (!(ifa->ifa_ifp->if_flags & IFF_UP)) { 117153541Sshin return; 1172120941Sume } 117353541Sshin if (nd6_dad_find(ifa) != NULL) { 117453541Sshin /* DAD already in progress */ 117553541Sshin return; 117653541Sshin } 117753541Sshin 117853541Sshin dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT); 117953541Sshin if (dp == NULL) { 118062587Sitojun log(LOG_ERR, "nd6_dad_start: memory allocation failed for " 118153541Sshin "%s(%s)\n", 1182165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 118353541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 118453541Sshin return; 118553541Sshin } 118653541Sshin bzero(dp, sizeof(*dp)); 118778064Sume callout_init(&dp->dad_timer_ch, 0); 1188182150Sjulian TAILQ_INSERT_TAIL(&V_dadq, (struct dadq *)dp, dad_list); 118953541Sshin 119078064Sume nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp), 1191165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 119253541Sshin 119353541Sshin /* 119453541Sshin * Send NS packet for DAD, ip6_dad_count times. 119553541Sshin * Note that we must delay the first transmission, if this is the 119653541Sshin * first packet to be sent from the interface after interface 119753541Sshin * (re)initialization. 119853541Sshin */ 119953541Sshin dp->dad_ifa = ifa; 120095023Ssuz IFAREF(ifa); /* just for safety */ 1201181803Sbz dp->dad_count = V_ip6_dad_count; 120253541Sshin dp->dad_ns_icount = dp->dad_na_icount = 0; 120362587Sitojun dp->dad_ns_ocount = dp->dad_ns_tcount = 0; 1204151539Ssuz if (delay == 0) { 120562587Sitojun nd6_dad_ns_output(dp, ifa); 1206121161Sume nd6_dad_starttimer(dp, 1207151539Ssuz (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 120853541Sshin } else { 1209151539Ssuz nd6_dad_starttimer(dp, delay); 121053541Sshin } 121153541Sshin} 121253541Sshin 121378064Sume/* 121478064Sume * terminate DAD unconditionally. used for address removals. 121578064Sume */ 121678064Sumevoid 1217171259Sdelphijnd6_dad_stop(struct ifaddr *ifa) 121878064Sume{ 1219183550Szec INIT_VNET_INET6(curvnet); 122078064Sume struct dadq *dp; 122178064Sume 1222181803Sbz if (!V_dad_init) 122378064Sume return; 122478064Sume dp = nd6_dad_find(ifa); 122578064Sume if (!dp) { 122678064Sume /* DAD wasn't started yet */ 122778064Sume return; 122878064Sume } 122978064Sume 123078064Sume nd6_dad_stoptimer(dp); 123178064Sume 1232181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 123378064Sume free(dp, M_IP6NDP); 123478064Sume dp = NULL; 123578064Sume IFAFREE(ifa); 123678064Sume} 123778064Sume 123853541Sshinstatic void 1239171259Sdelphijnd6_dad_timer(struct ifaddr *ifa) 124053541Sshin{ 1241183550Szec CURVNET_SET(dp->dad_vnet); 1242183550Szec INIT_VNET_INET6(curvnet); 124353541Sshin int s; 124453541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 124553541Sshin struct dadq *dp; 1246165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 124753541Sshin 124895023Ssuz s = splnet(); /* XXX */ 124953541Sshin 125053541Sshin /* Sanity check */ 125153541Sshin if (ia == NULL) { 125262587Sitojun log(LOG_ERR, "nd6_dad_timer: called with null parameter\n"); 125353541Sshin goto done; 125453541Sshin } 125553541Sshin dp = nd6_dad_find(ifa); 125653541Sshin if (dp == NULL) { 125762587Sitojun log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n"); 125853541Sshin goto done; 125953541Sshin } 126053541Sshin if (ia->ia6_flags & IN6_IFF_DUPLICATED) { 126162587Sitojun log(LOG_ERR, "nd6_dad_timer: called with duplicated address " 126253541Sshin "%s(%s)\n", 1263165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 126453541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 126553541Sshin goto done; 126653541Sshin } 126753541Sshin if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) { 126862587Sitojun log(LOG_ERR, "nd6_dad_timer: called with non-tentative address " 126953541Sshin "%s(%s)\n", 1270165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 127153541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 127253541Sshin goto done; 127353541Sshin } 127453541Sshin 127562587Sitojun /* timeouted with IFF_{RUNNING,UP} check */ 1276181803Sbz if (dp->dad_ns_tcount > V_dad_maxtry) { 127778064Sume nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n", 1278120941Sume if_name(ifa->ifa_ifp))); 127962587Sitojun 1280181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 128162587Sitojun free(dp, M_IP6NDP); 128262587Sitojun dp = NULL; 128362587Sitojun IFAFREE(ifa); 128462587Sitojun goto done; 128562587Sitojun } 128662587Sitojun 128753541Sshin /* Need more checks? */ 128853541Sshin if (dp->dad_ns_ocount < dp->dad_count) { 128953541Sshin /* 129053541Sshin * We have more NS to go. Send NS packet for DAD. 129153541Sshin */ 129262587Sitojun nd6_dad_ns_output(dp, ifa); 1293120941Sume nd6_dad_starttimer(dp, 1294151539Ssuz (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 129553541Sshin } else { 129653541Sshin /* 129753541Sshin * We have transmitted sufficient number of DAD packets. 129853541Sshin * See what we've got. 129953541Sshin */ 130053541Sshin int duplicate; 130153541Sshin 130253541Sshin duplicate = 0; 130353541Sshin 130453541Sshin if (dp->dad_na_icount) { 130553541Sshin /* 130653541Sshin * the check is in nd6_dad_na_input(), 130753541Sshin * but just in case 130853541Sshin */ 130953541Sshin duplicate++; 131053541Sshin } 131153541Sshin 131253541Sshin if (dp->dad_ns_icount) { 131353541Sshin /* We've seen NS, means DAD has failed. */ 131453541Sshin duplicate++; 131553541Sshin } 131653541Sshin 131753541Sshin if (duplicate) { 131853541Sshin /* (*dp) will be freed in nd6_dad_duplicated() */ 131953541Sshin dp = NULL; 132053541Sshin nd6_dad_duplicated(ifa); 132153541Sshin } else { 132253541Sshin /* 132353541Sshin * We are done with DAD. No NA came, no NS came. 1324148987Sume * No duplicate address found. 132553541Sshin */ 132653541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 132753541Sshin 132878064Sume nd6log((LOG_DEBUG, 132962587Sitojun "%s: DAD complete for %s - no duplicates found\n", 133062587Sitojun if_name(ifa->ifa_ifp), 1331165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 133253541Sshin 1333181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 133453541Sshin free(dp, M_IP6NDP); 133553541Sshin dp = NULL; 133662587Sitojun IFAFREE(ifa); 133753541Sshin } 133853541Sshin } 133953541Sshin 134053541Sshindone: 134153541Sshin splx(s); 1342183550Szec CURVNET_RESTORE(); 134353541Sshin} 134453541Sshin 134553541Sshinvoid 1346171259Sdelphijnd6_dad_duplicated(struct ifaddr *ifa) 134753541Sshin{ 1348183550Szec INIT_VNET_INET6(curvnet); 134953541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1350151477Ssuz struct ifnet *ifp; 135153541Sshin struct dadq *dp; 1352165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 135353541Sshin 135453541Sshin dp = nd6_dad_find(ifa); 135553541Sshin if (dp == NULL) { 135662587Sitojun log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n"); 135753541Sshin return; 135853541Sshin } 135953541Sshin 136078064Sume log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: " 136178064Sume "NS in/out=%d/%d, NA in=%d\n", 1362165118Sbz if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 136378064Sume dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount); 136453541Sshin 136553541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 136653541Sshin ia->ia6_flags |= IN6_IFF_DUPLICATED; 136753541Sshin 1368148987Sume /* We are done with DAD, with duplicate address found. (failure) */ 136978064Sume nd6_dad_stoptimer(dp); 137053541Sshin 1371151477Ssuz ifp = ifa->ifa_ifp; 137262587Sitojun log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n", 1373165118Sbz if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)); 137462587Sitojun log(LOG_ERR, "%s: manual intervention required\n", 1375151477Ssuz if_name(ifp)); 137653541Sshin 1377151477Ssuz /* 1378151477Ssuz * If the address is a link-local address formed from an interface 1379151477Ssuz * identifier based on the hardware address which is supposed to be 1380151477Ssuz * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP 1381151477Ssuz * operation on the interface SHOULD be disabled. 1382151477Ssuz * [rfc2462bis-03 Section 5.4.5] 1383151477Ssuz */ 1384151477Ssuz if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) { 1385151477Ssuz struct in6_addr in6; 1386151477Ssuz 1387151477Ssuz /* 1388151477Ssuz * To avoid over-reaction, we only apply this logic when we are 1389151477Ssuz * very sure that hardware addresses are supposed to be unique. 1390151477Ssuz */ 1391151477Ssuz switch (ifp->if_type) { 1392151477Ssuz case IFT_ETHER: 1393151477Ssuz case IFT_FDDI: 1394151477Ssuz case IFT_ATM: 1395151477Ssuz case IFT_IEEE1394: 1396151477Ssuz#ifdef IFT_IEEE80211 1397151477Ssuz case IFT_IEEE80211: 1398151477Ssuz#endif 1399151477Ssuz in6 = ia->ia_addr.sin6_addr; 1400151477Ssuz if (in6_get_hw_ifid(ifp, &in6) == 0 && 1401151477Ssuz IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) { 1402151477Ssuz ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED; 1403151477Ssuz log(LOG_ERR, "%s: possible hardware address " 1404151477Ssuz "duplication detected, disable IPv6\n", 1405151477Ssuz if_name(ifp)); 1406151477Ssuz } 1407151477Ssuz break; 1408151477Ssuz } 1409151477Ssuz } 1410151477Ssuz 1411181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 141253541Sshin free(dp, M_IP6NDP); 141353541Sshin dp = NULL; 141462587Sitojun IFAFREE(ifa); 141553541Sshin} 141653541Sshin 141762587Sitojunstatic void 1418171259Sdelphijnd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa) 141962587Sitojun{ 142062587Sitojun struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 142162587Sitojun struct ifnet *ifp = ifa->ifa_ifp; 142262587Sitojun 142362587Sitojun dp->dad_ns_tcount++; 142462587Sitojun if ((ifp->if_flags & IFF_UP) == 0) { 142562587Sitojun return; 142662587Sitojun } 1427148887Srwatson if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 142862587Sitojun return; 142962587Sitojun } 143062587Sitojun 143162587Sitojun dp->dad_ns_ocount++; 143262587Sitojun nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1); 143362587Sitojun} 143462587Sitojun 143562587Sitojunstatic void 1436171259Sdelphijnd6_dad_ns_input(struct ifaddr *ifa) 143753541Sshin{ 1438183550Szec INIT_VNET_INET6(curvnet); 143953541Sshin struct in6_ifaddr *ia; 144053541Sshin struct ifnet *ifp; 144178064Sume const struct in6_addr *taddr6; 144253541Sshin struct dadq *dp; 144353541Sshin int duplicate; 144453541Sshin 1445151465Ssuz if (ifa == NULL) 144653541Sshin panic("ifa == NULL in nd6_dad_ns_input"); 144753541Sshin 144853541Sshin ia = (struct in6_ifaddr *)ifa; 144953541Sshin ifp = ifa->ifa_ifp; 145053541Sshin taddr6 = &ia->ia_addr.sin6_addr; 145153541Sshin duplicate = 0; 145253541Sshin dp = nd6_dad_find(ifa); 145353541Sshin 145453541Sshin /* Quickhack - completely ignore DAD NS packets */ 1455181803Sbz if (V_dad_ignore_ns) { 1456165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 145778064Sume nd6log((LOG_INFO, 145878064Sume "nd6_dad_ns_input: ignoring DAD NS packet for " 1459165118Sbz "address %s(%s)\n", ip6_sprintf(ip6buf, taddr6), 146078064Sume if_name(ifa->ifa_ifp))); 146153541Sshin return; 146253541Sshin } 146353541Sshin 146453541Sshin /* 146553541Sshin * if I'm yet to start DAD, someone else started using this address 146653541Sshin * first. I have a duplicate and you win. 146753541Sshin */ 1468151465Ssuz if (dp == NULL || dp->dad_ns_ocount == 0) 146953541Sshin duplicate++; 147053541Sshin 147153541Sshin /* XXX more checks for loopback situation - see nd6_dad_timer too */ 147253541Sshin 147353541Sshin if (duplicate) { 147453541Sshin dp = NULL; /* will be freed in nd6_dad_duplicated() */ 147553541Sshin nd6_dad_duplicated(ifa); 147653541Sshin } else { 147753541Sshin /* 147853541Sshin * not sure if I got a duplicate. 147953541Sshin * increment ns count and see what happens. 148053541Sshin */ 148153541Sshin if (dp) 148253541Sshin dp->dad_ns_icount++; 148353541Sshin } 148453541Sshin} 148553541Sshin 148662587Sitojunstatic void 1487171259Sdelphijnd6_dad_na_input(struct ifaddr *ifa) 148853541Sshin{ 148953541Sshin struct dadq *dp; 149053541Sshin 1491151465Ssuz if (ifa == NULL) 149253541Sshin panic("ifa == NULL in nd6_dad_na_input"); 149353541Sshin 149453541Sshin dp = nd6_dad_find(ifa); 149553541Sshin if (dp) 149653541Sshin dp->dad_na_icount++; 149753541Sshin 149853541Sshin /* remove the address. */ 149953541Sshin nd6_dad_duplicated(ifa); 150053541Sshin} 1501