nd6_nbr.c revision 153227
162587Sitojun/* $FreeBSD: head/sys/netinet6/nd6_nbr.c 153227 2005-12-08 06:43:39Z ume $ */ 295023Ssuz/* $KAME: nd6_nbr.c,v 1.86 2002/01/21 02:33:04 jinmei Exp $ */ 362587Sitojun 4139826Simp/*- 553541Sshin * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 653541Sshin * All rights reserved. 753541Sshin * 853541Sshin * Redistribution and use in source and binary forms, with or without 953541Sshin * modification, are permitted provided that the following conditions 1053541Sshin * are met: 1153541Sshin * 1. Redistributions of source code must retain the above copyright 1253541Sshin * notice, this list of conditions and the following disclaimer. 1353541Sshin * 2. Redistributions in binary form must reproduce the above copyright 1453541Sshin * notice, this list of conditions and the following disclaimer in the 1553541Sshin * documentation and/or other materials provided with the distribution. 1653541Sshin * 3. Neither the name of the project nor the names of its contributors 1753541Sshin * may be used to endorse or promote products derived from this software 1853541Sshin * without specific prior written permission. 1953541Sshin * 2053541Sshin * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 2153541Sshin * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2253541Sshin * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2353541Sshin * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2453541Sshin * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2553541Sshin * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2653541Sshin * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2753541Sshin * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2853541Sshin * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2953541Sshin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3053541Sshin * SUCH DAMAGE. 3153541Sshin */ 3253541Sshin 3362587Sitojun#include "opt_inet.h" 3462587Sitojun#include "opt_inet6.h" 35142215Sglebius#include "opt_ipsec.h" 36142215Sglebius#include "opt_carp.h" 3755009Sshin 3853541Sshin#include <sys/param.h> 3953541Sshin#include <sys/systm.h> 4053541Sshin#include <sys/malloc.h> 4153541Sshin#include <sys/mbuf.h> 4253541Sshin#include <sys/socket.h> 4353541Sshin#include <sys/sockio.h> 4453541Sshin#include <sys/time.h> 4553541Sshin#include <sys/kernel.h> 4653541Sshin#include <sys/errno.h> 4753541Sshin#include <sys/syslog.h> 4853541Sshin#include <sys/queue.h> 4978064Sume#include <sys/callout.h> 5053541Sshin 5153541Sshin#include <net/if.h> 5253541Sshin#include <net/if_types.h> 5353541Sshin#include <net/if_dl.h> 54147306Sbrooks#include <net/if_var.h> 5553541Sshin#include <net/route.h> 5653541Sshin 5753541Sshin#include <netinet/in.h> 5853541Sshin#include <netinet/in_var.h> 5953541Sshin#include <netinet6/in6_var.h> 60151477Ssuz#include <netinet6/in6_ifattach.h> 6162587Sitojun#include <netinet/ip6.h> 6253541Sshin#include <netinet6/ip6_var.h> 63148385Sume#include <netinet6/scope6_var.h> 6453541Sshin#include <netinet6/nd6.h> 6562587Sitojun#include <netinet/icmp6.h> 6653541Sshin 67142215Sglebius#ifdef DEV_CARP 68142215Sglebius#include <netinet/ip_carp.h> 69142215Sglebius#endif 70142215Sglebius 7153541Sshin#include <net/net_osdep.h> 7253541Sshin 7362587Sitojun#define SDL(s) ((struct sockaddr_dl *)s) 7453541Sshin 7562587Sitojunstruct dadq; 7662587Sitojunstatic struct dadq *nd6_dad_find __P((struct ifaddr *)); 7778064Sumestatic void nd6_dad_starttimer __P((struct dadq *, int)); 7878064Sumestatic void nd6_dad_stoptimer __P((struct dadq *)); 7962587Sitojunstatic void nd6_dad_timer __P((struct ifaddr *)); 8062587Sitojunstatic void nd6_dad_ns_output __P((struct dadq *, struct ifaddr *)); 8162587Sitojunstatic void nd6_dad_ns_input __P((struct ifaddr *)); 8262587Sitojunstatic void nd6_dad_na_input __P((struct ifaddr *)); 8353541Sshin 8462587Sitojunstatic int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/ 8562587Sitojunstatic int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */ 8653541Sshin 8753541Sshin/* 88108470Sschweikh * Input a Neighbor Solicitation Message. 8953541Sshin * 9053541Sshin * Based on RFC 2461 91148987Sume * Based on RFC 2462 (duplicate address detection) 9253541Sshin */ 9353541Sshinvoid 9453541Sshinnd6_ns_input(m, off, icmp6len) 9553541Sshin struct mbuf *m; 9653541Sshin int off, icmp6len; 9753541Sshin{ 9853541Sshin struct ifnet *ifp = m->m_pkthdr.rcvif; 9953541Sshin struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 10062587Sitojun struct nd_neighbor_solicit *nd_ns; 10153541Sshin struct in6_addr saddr6 = ip6->ip6_src; 10253541Sshin struct in6_addr daddr6 = ip6->ip6_dst; 10362587Sitojun struct in6_addr taddr6; 10453541Sshin struct in6_addr myaddr6; 10553541Sshin char *lladdr = NULL; 106142215Sglebius struct ifaddr *ifa = NULL; 10753541Sshin int lladdrlen = 0; 10853541Sshin int anycast = 0, proxy = 0, tentative = 0; 10953541Sshin int tlladdr; 11053541Sshin union nd_opts ndopts; 11162587Sitojun struct sockaddr_dl *proxydl = NULL; 11253541Sshin 11378064Sume#ifndef PULLDOWN_TEST 11478064Sume IP6_EXTHDR_CHECK(m, off, icmp6len,); 11578064Sume nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off); 11678064Sume#else 11778064Sume IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len); 11878064Sume if (nd_ns == NULL) { 11978064Sume icmp6stat.icp6s_tooshort++; 12078064Sume return; 12178064Sume } 12278064Sume#endif 12378064Sume ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */ 12478064Sume taddr6 = nd_ns->nd_ns_target; 125148385Sume if (in6_setscope(&taddr6, ifp, NULL) != 0) 126148385Sume goto bad; 12778064Sume 12853541Sshin if (ip6->ip6_hlim != 255) { 12978064Sume nd6log((LOG_ERR, 13078064Sume "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n", 13178064Sume ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 13278064Sume ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 13378064Sume goto bad; 13453541Sshin } 13553541Sshin 13653541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 137148987Sume /* dst has to be a solicited node multicast address. */ 138120941Sume if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL && 13995023Ssuz /* don't check ifindex portion */ 140120941Sume daddr6.s6_addr32[1] == 0 && 141120941Sume daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE && 142120941Sume daddr6.s6_addr8[12] == 0xff) { 14395023Ssuz ; /* good */ 14453541Sshin } else { 14578064Sume nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 146120941Sume "(wrong ip6 dst)\n")); 14753541Sshin goto bad; 14853541Sshin } 14953541Sshin } 15053541Sshin 15153541Sshin if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 15278064Sume nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n")); 15353541Sshin goto bad; 15453541Sshin } 15553541Sshin 15653541Sshin icmp6len -= sizeof(*nd_ns); 15753541Sshin nd6_option_init(nd_ns + 1, icmp6len, &ndopts); 15853541Sshin if (nd6_options(&ndopts) < 0) { 15978064Sume nd6log((LOG_INFO, 16078064Sume "nd6_ns_input: invalid ND option, ignored\n")); 16178064Sume /* nd6_options have incremented stats */ 16278064Sume goto freeit; 16353541Sshin } 16453541Sshin 16553541Sshin if (ndopts.nd_opts_src_lladdr) { 16695023Ssuz lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 16753541Sshin lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 16853541Sshin } 169120941Sume 17053541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) { 17178064Sume nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 17278064Sume "(link-layer address option)\n")); 17353541Sshin goto bad; 17453541Sshin } 17553541Sshin 17653541Sshin /* 17753541Sshin * Attaching target link-layer address to the NA? 17853541Sshin * (RFC 2461 7.2.4) 17953541Sshin * 18053541Sshin * NS IP dst is unicast/anycast MUST NOT add 18153541Sshin * NS IP dst is solicited-node multicast MUST add 18253541Sshin * 18353541Sshin * In implementation, we add target link-layer address by default. 18453541Sshin * We do not add one in MUST NOT cases. 18553541Sshin */ 18653541Sshin if (!IN6_IS_ADDR_MULTICAST(&daddr6)) 18753541Sshin tlladdr = 0; 18853541Sshin else 18953541Sshin tlladdr = 1; 19053541Sshin 19153541Sshin /* 19253541Sshin * Target address (taddr6) must be either: 19353541Sshin * (1) Valid unicast/anycast address for my receiving interface, 19453541Sshin * (2) Unicast address for which I'm offering proxy service, or 19553541Sshin * (3) "tentative" address on which DAD is being performed. 19653541Sshin */ 19753541Sshin /* (1) and (3) check. */ 198142215Sglebius#ifdef DEV_CARP 199142215Sglebius if (ifp->if_carp) 200142215Sglebius ifa = carp_iamatch6(ifp->if_carp, &taddr6); 201151465Ssuz if (ifa == NULL) 202142215Sglebius ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 203142215Sglebius#else 20453541Sshin ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 205142215Sglebius#endif 20653541Sshin 20753541Sshin /* (2) check. */ 208151465Ssuz if (ifa == NULL) { 20953541Sshin struct rtentry *rt; 21053541Sshin struct sockaddr_in6 tsin6; 211121765Ssam int need_proxy; 21253541Sshin 21353541Sshin bzero(&tsin6, sizeof tsin6); 21453541Sshin tsin6.sin6_len = sizeof(struct sockaddr_in6); 21553541Sshin tsin6.sin6_family = AF_INET6; 21653541Sshin tsin6.sin6_addr = taddr6; 21753541Sshin 21853541Sshin rt = rtalloc1((struct sockaddr *)&tsin6, 0, 0); 219121765Ssam need_proxy = (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 && 220121765Ssam rt->rt_gateway->sa_family == AF_LINK); 221121765Ssam if (rt) 222121765Ssam rtfree(rt); 223121765Ssam if (need_proxy) { 22453541Sshin /* 22562587Sitojun * proxy NDP for single entry 22653541Sshin */ 22762587Sitojun ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 22862587Sitojun IN6_IFF_NOTREADY|IN6_IFF_ANYCAST); 22962587Sitojun if (ifa) { 23053541Sshin proxy = 1; 23162587Sitojun proxydl = SDL(rt->rt_gateway); 23262587Sitojun } 23353541Sshin } 23453541Sshin } 235151479Ssuz if (ifa == NULL) { 23653541Sshin /* 23778064Sume * We've got an NS packet, and we don't have that adddress 23853541Sshin * assigned for us. We MUST silently ignore it. 23953541Sshin * See RFC2461 7.2.3. 24053541Sshin */ 24162587Sitojun goto freeit; 24253541Sshin } 24353541Sshin myaddr6 = *IFA_IN6(ifa); 24453541Sshin anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST; 24553541Sshin tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE; 24653541Sshin if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED) 24762587Sitojun goto freeit; 24853541Sshin 24953541Sshin if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 250120941Sume nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s " 25153541Sshin "(if %d, NS packet %d)\n", 252120941Sume ip6_sprintf(&taddr6), 253120941Sume ifp->if_addrlen, lladdrlen - 2)); 25478064Sume goto bad; 25553541Sshin } 25653541Sshin 25753541Sshin if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) { 258120941Sume nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n", 259120941Sume ip6_sprintf(&saddr6))); 26062587Sitojun goto freeit; 26153541Sshin } 26253541Sshin 26353541Sshin /* 26453541Sshin * We have neighbor solicitation packet, with target address equals to 26553541Sshin * one of my tentative address. 26653541Sshin * 26753541Sshin * src addr how to process? 26853541Sshin * --- --- 26953541Sshin * multicast of course, invalid (rejected in ip6_input) 27053541Sshin * unicast somebody is doing address resolution -> ignore 27153541Sshin * unspec dup address detection 27253541Sshin * 27353541Sshin * The processing is defined in RFC 2462. 27453541Sshin */ 27553541Sshin if (tentative) { 27653541Sshin /* 27753541Sshin * If source address is unspecified address, it is for 278148987Sume * duplicate address detection. 27953541Sshin * 28053541Sshin * If not, the packet is for addess resolution; 28153541Sshin * silently ignore it. 28253541Sshin */ 28353541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 28453541Sshin nd6_dad_ns_input(ifa); 28553541Sshin 28662587Sitojun goto freeit; 28753541Sshin } 28853541Sshin 28953541Sshin /* 29053541Sshin * If the source address is unspecified address, entries must not 29153541Sshin * be created or updated. 29253541Sshin * It looks that sender is performing DAD. Output NA toward 29353541Sshin * all-node multicast address, to tell the sender that I'm using 29453541Sshin * the address. 29553541Sshin * S bit ("solicited") must be zero. 29653541Sshin */ 29753541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 298148385Sume struct in6_addr in6_all; 299148385Sume 300148385Sume in6_all = in6addr_linklocal_allnodes; 301148385Sume if (in6_setscope(&in6_all, ifp, NULL) != 0) 302148385Sume goto bad; 303148385Sume nd6_na_output(ifp, &in6_all, &taddr6, 304120941Sume ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 305120941Sume (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0), 306120941Sume tlladdr, (struct sockaddr *)proxydl); 30762587Sitojun goto freeit; 30853541Sshin } 30953541Sshin 310120941Sume nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, 311120941Sume ND_NEIGHBOR_SOLICIT, 0); 31253541Sshin 31353541Sshin nd6_na_output(ifp, &saddr6, &taddr6, 314120941Sume ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 315120941Sume (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED, 316120941Sume tlladdr, (struct sockaddr *)proxydl); 31762587Sitojun freeit: 31862587Sitojun m_freem(m); 31953541Sshin return; 32053541Sshin 32153541Sshin bad: 32278064Sume nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6))); 32378064Sume nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6))); 32478064Sume nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6))); 32578064Sume icmp6stat.icp6s_badns++; 32662587Sitojun m_freem(m); 32753541Sshin} 32853541Sshin 32953541Sshin/* 330108470Sschweikh * Output a Neighbor Solicitation Message. Caller specifies: 33153541Sshin * - ICMP6 header source IP6 address 33253541Sshin * - ND6 header target IP6 address 33353541Sshin * - ND6 header source datalink address 33453541Sshin * 33553541Sshin * Based on RFC 2461 336148987Sume * Based on RFC 2462 (duplicate address detection) 33753541Sshin */ 33853541Sshinvoid 33953541Sshinnd6_ns_output(ifp, daddr6, taddr6, ln, dad) 34053541Sshin struct ifnet *ifp; 34178064Sume const struct in6_addr *daddr6, *taddr6; 34253541Sshin struct llinfo_nd6 *ln; /* for source address determination */ 343148987Sume int dad; /* duplicate address detection */ 34453541Sshin{ 34553541Sshin struct mbuf *m; 34653541Sshin struct ip6_hdr *ip6; 34753541Sshin struct nd_neighbor_solicit *nd_ns; 348148385Sume struct in6_addr *src, src_in; 34953541Sshin struct ip6_moptions im6o; 35053541Sshin int icmp6len; 35162587Sitojun int maxlen; 35253541Sshin caddr_t mac; 353148385Sume struct route_in6 ro; 354120941Sume 355148385Sume bzero(&ro, sizeof(ro)); 356148385Sume 35753541Sshin if (IN6_IS_ADDR_MULTICAST(taddr6)) 35853541Sshin return; 35953541Sshin 36062587Sitojun /* estimate the size of message */ 36162587Sitojun maxlen = sizeof(*ip6) + sizeof(*nd_ns); 36262587Sitojun maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 36362587Sitojun if (max_linkhdr + maxlen >= MCLBYTES) { 36462587Sitojun#ifdef DIAGNOSTIC 36562587Sitojun printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES " 36662587Sitojun "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 36762587Sitojun#endif 36853541Sshin return; 36962587Sitojun } 37053541Sshin 371111119Simp MGETHDR(m, M_DONTWAIT, MT_DATA); 37262587Sitojun if (m && max_linkhdr + maxlen >= MHLEN) { 373111119Simp MCLGET(m, M_DONTWAIT); 37462587Sitojun if ((m->m_flags & M_EXT) == 0) { 37562587Sitojun m_free(m); 37662587Sitojun m = NULL; 37762587Sitojun } 37862587Sitojun } 37962587Sitojun if (m == NULL) 38062587Sitojun return; 38178064Sume m->m_pkthdr.rcvif = NULL; 38262587Sitojun 38353541Sshin if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) { 38453541Sshin m->m_flags |= M_MCAST; 38553541Sshin im6o.im6o_multicast_ifp = ifp; 38653541Sshin im6o.im6o_multicast_hlim = 255; 38753541Sshin im6o.im6o_multicast_loop = 0; 38853541Sshin } 38953541Sshin 39053541Sshin icmp6len = sizeof(*nd_ns); 39153541Sshin m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len; 39295023Ssuz m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 39353541Sshin 39453541Sshin /* fill neighbor solicitation packet */ 39553541Sshin ip6 = mtod(m, struct ip6_hdr *); 39653541Sshin ip6->ip6_flow = 0; 39762587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 39862587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 39953541Sshin /* ip6->ip6_plen will be set later */ 40053541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 40153541Sshin ip6->ip6_hlim = 255; 40253541Sshin if (daddr6) 40353541Sshin ip6->ip6_dst = *daddr6; 40453541Sshin else { 40553541Sshin ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 406148385Sume ip6->ip6_dst.s6_addr16[1] = 0; 40753541Sshin ip6->ip6_dst.s6_addr32[1] = 0; 40853541Sshin ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE; 40953541Sshin ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3]; 41053541Sshin ip6->ip6_dst.s6_addr8[12] = 0xff; 411148385Sume if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 412148385Sume goto bad; 41353541Sshin } 41453541Sshin if (!dad) { 41553541Sshin /* 41653541Sshin * RFC2461 7.2.2: 41753541Sshin * "If the source address of the packet prompting the 41853541Sshin * solicitation is the same as one of the addresses assigned 41953541Sshin * to the outgoing interface, that address SHOULD be placed 42053541Sshin * in the IP Source Address of the outgoing solicitation. 42153541Sshin * Otherwise, any one of the addresses assigned to the 42253541Sshin * interface should be used." 42353541Sshin * 42453541Sshin * We use the source address for the prompting packet 42553541Sshin * (saddr6), if: 42653541Sshin * - saddr6 is given from the caller (by giving "ln"), and 42753541Sshin * - saddr6 belongs to the outgoing interface. 428148385Sume * Otherwise, we perform the source address selection as usual. 42953541Sshin */ 43095023Ssuz struct ip6_hdr *hip6; /* hold ip6 */ 431148385Sume struct in6_addr *hsrc = NULL; 43253541Sshin 43353541Sshin if (ln && ln->ln_hold) { 434148987Sume /* 435148987Sume * assuming every packet in ln_hold has the same IP 436148987Sume * header 437148987Sume */ 43853541Sshin hip6 = mtod(ln->ln_hold, struct ip6_hdr *); 43953541Sshin /* XXX pullup? */ 44053541Sshin if (sizeof(*hip6) < ln->ln_hold->m_len) 441148385Sume hsrc = &hip6->ip6_src; 44253541Sshin else 443148385Sume hsrc = NULL; 444148385Sume } 445148385Sume if (hsrc && in6ifa_ifpwithaddr(ifp, hsrc)) 446148385Sume src = hsrc; 44753541Sshin else { 448148385Sume int error; 449148385Sume struct sockaddr_in6 dst_sa; 450148385Sume 451148385Sume bzero(&dst_sa, sizeof(dst_sa)); 452148385Sume dst_sa.sin6_family = AF_INET6; 453148385Sume dst_sa.sin6_len = sizeof(dst_sa); 454148385Sume dst_sa.sin6_addr = ip6->ip6_dst; 455148385Sume 456148385Sume src = in6_selectsrc(&dst_sa, NULL, 457148385Sume NULL, &ro, NULL, NULL, &error); 458148385Sume if (src == NULL) { 459148385Sume nd6log((LOG_DEBUG, 460148385Sume "nd6_ns_output: source can't be " 461148385Sume "determined: dst=%s, error=%d\n", 462148385Sume ip6_sprintf(&dst_sa.sin6_addr), error)); 463148385Sume goto bad; 46453541Sshin } 46553541Sshin } 46653541Sshin } else { 46753541Sshin /* 46853541Sshin * Source address for DAD packet must always be IPv6 46953541Sshin * unspecified address. (0::0) 470148385Sume * We actually don't have to 0-clear the address (we did it 471148385Sume * above), but we do so here explicitly to make the intention 472148385Sume * clearer. 47353541Sshin */ 474148385Sume bzero(&src_in, sizeof(src_in)); 475148385Sume src = &src_in; 47653541Sshin } 477148385Sume ip6->ip6_src = *src; 47853541Sshin nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1); 47953541Sshin nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT; 48053541Sshin nd_ns->nd_ns_code = 0; 48153541Sshin nd_ns->nd_ns_reserved = 0; 48253541Sshin nd_ns->nd_ns_target = *taddr6; 483121315Sume in6_clearscope(&nd_ns->nd_ns_target); /* XXX */ 48453541Sshin 48553541Sshin /* 48653541Sshin * Add source link-layer address option. 48753541Sshin * 48853541Sshin * spec implementation 48953541Sshin * --- --- 49053541Sshin * DAD packet MUST NOT do not add the option 49153541Sshin * there's no link layer address: 49253541Sshin * impossible do not add the option 49353541Sshin * there's link layer address: 49453541Sshin * Multicast NS MUST add one add the option 49553541Sshin * Unicast NS SHOULD add one add the option 49653541Sshin */ 49753541Sshin if (!dad && (mac = nd6_ifptomac(ifp))) { 49853541Sshin int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 49953541Sshin struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); 50053541Sshin /* 8 byte alignments... */ 50153541Sshin optlen = (optlen + 7) & ~7; 502120941Sume 50353541Sshin m->m_pkthdr.len += optlen; 50453541Sshin m->m_len += optlen; 50553541Sshin icmp6len += optlen; 50653541Sshin bzero((caddr_t)nd_opt, optlen); 50753541Sshin nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; 50853541Sshin nd_opt->nd_opt_len = optlen >> 3; 50953541Sshin bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 51053541Sshin } 51153541Sshin 51253541Sshin ip6->ip6_plen = htons((u_short)icmp6len); 51353541Sshin nd_ns->nd_ns_cksum = 0; 514120941Sume nd_ns->nd_ns_cksum = 515120941Sume in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len); 51653541Sshin 517151536Ssuz ip6_output(m, NULL, &ro, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL, NULL); 518148385Sume icmp6_ifstat_inc(ifp, ifs6_out_msg); 519148385Sume icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit); 520148385Sume icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++; 521148385Sume 522148385Sume if (ro.ro_rt) { /* we don't cache this route. */ 523148385Sume RTFREE(ro.ro_rt); 52453541Sshin } 525148385Sume return; 526148385Sume 527148385Sume bad: 528148385Sume if (ro.ro_rt) { 529148385Sume RTFREE(ro.ro_rt); 530148385Sume } 531148385Sume m_freem(m); 532148385Sume return; 53353541Sshin} 53453541Sshin 53553541Sshin/* 53653541Sshin * Neighbor advertisement input handling. 53753541Sshin * 53853541Sshin * Based on RFC 2461 539148987Sume * Based on RFC 2462 (duplicate address detection) 54062587Sitojun * 54162587Sitojun * the following items are not implemented yet: 54262587Sitojun * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 54362587Sitojun * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 54453541Sshin */ 54553541Sshinvoid 54653541Sshinnd6_na_input(m, off, icmp6len) 54753541Sshin struct mbuf *m; 54853541Sshin int off, icmp6len; 54953541Sshin{ 55053541Sshin struct ifnet *ifp = m->m_pkthdr.rcvif; 55153541Sshin struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 55262587Sitojun struct nd_neighbor_advert *nd_na; 55353541Sshin struct in6_addr daddr6 = ip6->ip6_dst; 55462587Sitojun struct in6_addr taddr6; 55562587Sitojun int flags; 55662587Sitojun int is_router; 55762587Sitojun int is_solicited; 55862587Sitojun int is_override; 55953541Sshin char *lladdr = NULL; 56053541Sshin int lladdrlen = 0; 56153541Sshin struct ifaddr *ifa; 56253541Sshin struct llinfo_nd6 *ln; 56353541Sshin struct rtentry *rt; 56453541Sshin struct sockaddr_dl *sdl; 56553541Sshin union nd_opts ndopts; 56653541Sshin 56753541Sshin if (ip6->ip6_hlim != 255) { 56878064Sume nd6log((LOG_ERR, 56978064Sume "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n", 57078064Sume ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 57178064Sume ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 57278064Sume goto bad; 57362587Sitojun } 57462587Sitojun 57562587Sitojun#ifndef PULLDOWN_TEST 57662587Sitojun IP6_EXTHDR_CHECK(m, off, icmp6len,); 57762587Sitojun nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off); 57862587Sitojun#else 57962587Sitojun IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len); 58062587Sitojun if (nd_na == NULL) { 58162587Sitojun icmp6stat.icp6s_tooshort++; 58253541Sshin return; 58353541Sshin } 58462587Sitojun#endif 585148385Sume 58662587Sitojun flags = nd_na->nd_na_flags_reserved; 58762587Sitojun is_router = ((flags & ND_NA_FLAG_ROUTER) != 0); 58862587Sitojun is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0); 58962587Sitojun is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0); 59053541Sshin 591148385Sume taddr6 = nd_na->nd_na_target; 592148385Sume if (in6_setscope(&taddr6, ifp, NULL)) 593150202Ssuz goto bad; /* XXX: impossible */ 59453541Sshin 59553541Sshin if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 59678064Sume nd6log((LOG_ERR, 59753541Sshin "nd6_na_input: invalid target address %s\n", 59878064Sume ip6_sprintf(&taddr6))); 59978064Sume goto bad; 60053541Sshin } 60153541Sshin if (IN6_IS_ADDR_MULTICAST(&daddr6)) 60253541Sshin if (is_solicited) { 60378064Sume nd6log((LOG_ERR, 60478064Sume "nd6_na_input: a solicited adv is multicasted\n")); 60578064Sume goto bad; 60653541Sshin } 60753541Sshin 60853541Sshin icmp6len -= sizeof(*nd_na); 60953541Sshin nd6_option_init(nd_na + 1, icmp6len, &ndopts); 61053541Sshin if (nd6_options(&ndopts) < 0) { 61178064Sume nd6log((LOG_INFO, 61278064Sume "nd6_na_input: invalid ND option, ignored\n")); 61378064Sume /* nd6_options have incremented stats */ 61462587Sitojun goto freeit; 61553541Sshin } 61653541Sshin 61753541Sshin if (ndopts.nd_opts_tgt_lladdr) { 61853541Sshin lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 61953541Sshin lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 62053541Sshin } 62153541Sshin 62253541Sshin ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 62353541Sshin 62453541Sshin /* 62553541Sshin * Target address matches one of my interface address. 62653541Sshin * 62753541Sshin * If my address is tentative, this means that there's somebody 62853541Sshin * already using the same address as mine. This indicates DAD failure. 62953541Sshin * This is defined in RFC 2462. 63053541Sshin * 63153541Sshin * Otherwise, process as defined in RFC 2461. 63253541Sshin */ 63353541Sshin if (ifa 63453541Sshin && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) { 63553541Sshin nd6_dad_na_input(ifa); 63662587Sitojun goto freeit; 63753541Sshin } 63853541Sshin 63995023Ssuz /* Just for safety, maybe unnecessary. */ 64053541Sshin if (ifa) { 64153541Sshin log(LOG_ERR, 64253541Sshin "nd6_na_input: duplicate IP6 address %s\n", 64353541Sshin ip6_sprintf(&taddr6)); 64462587Sitojun goto freeit; 64553541Sshin } 64653541Sshin 64753541Sshin if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 648120941Sume nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s " 649120941Sume "(if %d, NA packet %d)\n", ip6_sprintf(&taddr6), 650120941Sume ifp->if_addrlen, lladdrlen - 2)); 65178064Sume goto bad; 65253541Sshin } 65353541Sshin 65453541Sshin /* 655120941Sume * If no neighbor cache entry is found, NA SHOULD silently be 656120941Sume * discarded. 65753541Sshin */ 65853541Sshin rt = nd6_lookup(&taddr6, 0, ifp); 65953541Sshin if ((rt == NULL) || 66053541Sshin ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) || 66153541Sshin ((sdl = SDL(rt->rt_gateway)) == NULL)) 66262587Sitojun goto freeit; 66353541Sshin 66453541Sshin if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 66553541Sshin /* 66653541Sshin * If the link-layer has address, and no lladdr option came, 66753541Sshin * discard the packet. 66853541Sshin */ 669151465Ssuz if (ifp->if_addrlen && lladdr == NULL) 67062587Sitojun goto freeit; 67153541Sshin 67253541Sshin /* 67353541Sshin * Record link-layer address, and update the state. 67453541Sshin */ 67553541Sshin sdl->sdl_alen = ifp->if_addrlen; 67653541Sshin bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 67753541Sshin if (is_solicited) { 67853541Sshin ln->ln_state = ND6_LLINFO_REACHABLE; 67962587Sitojun ln->ln_byhint = 0; 680151539Ssuz if (!ND6_LLINFO_PERMANENT(ln)) { 681151539Ssuz nd6_llinfo_settimer(ln, 682151539Ssuz (long)ND_IFINFO(rt->rt_ifp)->reachable * hz); 683120941Sume } 68478064Sume } else { 68553541Sshin ln->ln_state = ND6_LLINFO_STALE; 686151539Ssuz nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 68778064Sume } 68878064Sume if ((ln->ln_router = is_router) != 0) { 68978064Sume /* 69078064Sume * This means a router's state has changed from 69178064Sume * non-reachable to probably reachable, and might 69278064Sume * affect the status of associated prefixes.. 69378064Sume */ 69478064Sume pfxlist_onlink_check(); 69578064Sume } 69653541Sshin } else { 69753541Sshin int llchange; 69853541Sshin 69953541Sshin /* 70053541Sshin * Check if the link-layer address has changed or not. 70153541Sshin */ 702151465Ssuz if (lladdr == NULL) 70353541Sshin llchange = 0; 70453541Sshin else { 70553541Sshin if (sdl->sdl_alen) { 70653541Sshin if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 70753541Sshin llchange = 1; 70853541Sshin else 70953541Sshin llchange = 0; 71053541Sshin } else 71153541Sshin llchange = 1; 71253541Sshin } 71353541Sshin 71453541Sshin /* 71553541Sshin * This is VERY complex. Look at it with care. 71653541Sshin * 71753541Sshin * override solicit lladdr llchange action 71853541Sshin * (L: record lladdr) 71953541Sshin * 72053541Sshin * 0 0 n -- (2c) 72153541Sshin * 0 0 y n (2b) L 72253541Sshin * 0 0 y y (1) REACHABLE->STALE 72353541Sshin * 0 1 n -- (2c) *->REACHABLE 72453541Sshin * 0 1 y n (2b) L *->REACHABLE 72553541Sshin * 0 1 y y (1) REACHABLE->STALE 72653541Sshin * 1 0 n -- (2a) 72753541Sshin * 1 0 y n (2a) L 72853541Sshin * 1 0 y y (2a) L *->STALE 72953541Sshin * 1 1 n -- (2a) *->REACHABLE 73053541Sshin * 1 1 y n (2a) L *->REACHABLE 73153541Sshin * 1 1 y y (2a) L *->REACHABLE 73253541Sshin */ 733151539Ssuz if (!is_override && (lladdr != NULL && llchange)) { /* (1) */ 73453541Sshin /* 73553541Sshin * If state is REACHABLE, make it STALE. 73653541Sshin * no other updates should be done. 73753541Sshin */ 73878064Sume if (ln->ln_state == ND6_LLINFO_REACHABLE) { 73953541Sshin ln->ln_state = ND6_LLINFO_STALE; 740151539Ssuz nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 74178064Sume } 74262587Sitojun goto freeit; 74353541Sshin } else if (is_override /* (2a) */ 744151465Ssuz || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */ 745151465Ssuz || lladdr == NULL) { /* (2c) */ 74653541Sshin /* 74753541Sshin * Update link-local address, if any. 74853541Sshin */ 749151465Ssuz if (lladdr != NULL) { 75053541Sshin sdl->sdl_alen = ifp->if_addrlen; 75153541Sshin bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 75253541Sshin } 75353541Sshin 75453541Sshin /* 75553541Sshin * If solicited, make the state REACHABLE. 75653541Sshin * If not solicited and the link-layer address was 75753541Sshin * changed, make it STALE. 75853541Sshin */ 75953541Sshin if (is_solicited) { 76053541Sshin ln->ln_state = ND6_LLINFO_REACHABLE; 76162587Sitojun ln->ln_byhint = 0; 762151539Ssuz if (!ND6_LLINFO_PERMANENT(ln)) { 763151539Ssuz nd6_llinfo_settimer(ln, 764151539Ssuz (long)ND_IFINFO(ifp)->reachable * hz); 76553541Sshin } 76653541Sshin } else { 767151465Ssuz if (lladdr != NULL && llchange) { 76853541Sshin ln->ln_state = ND6_LLINFO_STALE; 769151539Ssuz nd6_llinfo_settimer(ln, 770151539Ssuz (long)nd6_gctimer * hz); 77178064Sume } 77253541Sshin } 77353541Sshin } 77453541Sshin 77553541Sshin if (ln->ln_router && !is_router) { 77653541Sshin /* 77753541Sshin * The peer dropped the router flag. 77853541Sshin * Remove the sender from the Default Router List and 77953541Sshin * update the Destination Cache entries. 78053541Sshin */ 78153541Sshin struct nd_defrouter *dr; 78253541Sshin struct in6_addr *in6; 78353541Sshin int s; 78453541Sshin 78553541Sshin in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr; 78695023Ssuz 78795023Ssuz /* 78895023Ssuz * Lock to protect the default router list. 78995023Ssuz * XXX: this might be unnecessary, since this function 79095023Ssuz * is only called under the network software interrupt 791120941Sume * context. However, we keep it just for safety. 79295023Ssuz */ 79353541Sshin s = splnet(); 794128422Sluigi dr = defrouter_lookup(in6, ifp); 79553541Sshin if (dr) 79653541Sshin defrtrlist_del(dr); 797151539Ssuz else if (!ip6_forwarding) { 79853541Sshin /* 79953541Sshin * Even if the neighbor is not in the default 80053541Sshin * router list, the neighbor may be used 80153541Sshin * as a next hop for some destinations 80253541Sshin * (e.g. redirect case). So we must 80353541Sshin * call rt6_flush explicitly. 80453541Sshin */ 805128422Sluigi rt6_flush(&ip6->ip6_src, ifp); 80653541Sshin } 80753541Sshin splx(s); 80853541Sshin } 80953541Sshin ln->ln_router = is_router; 81053541Sshin } 81153541Sshin rt->rt_flags &= ~RTF_REJECT; 81253541Sshin ln->ln_asked = 0; 81353541Sshin if (ln->ln_hold) { 814151539Ssuz struct mbuf *m_hold, *m_hold_next; 815151539Ssuz 816151539Ssuz for (m_hold = ln->ln_hold; m_hold; m_hold = m_hold_next) { 817151539Ssuz struct mbuf *mpkt = NULL; 818151539Ssuz 819151539Ssuz m_hold_next = m_hold->m_nextpkt; 820151539Ssuz mpkt = m_copym(m_hold, 0, M_COPYALL, M_DONTWAIT); 821151539Ssuz if (mpkt == NULL) { 822151539Ssuz m_freem(m_hold); 823151539Ssuz break; 824151539Ssuz } 825151539Ssuz mpkt->m_nextpkt = NULL; 826151539Ssuz /* 827151539Ssuz * we assume ifp is not a loopback here, so just set 828151539Ssuz * the 2nd argument as the 1st one. 829151539Ssuz */ 830151539Ssuz nd6_output(ifp, ifp, mpkt, 831151539Ssuz (struct sockaddr_in6 *)rt_key(rt), rt); 832151539Ssuz } 833120941Sume ln->ln_hold = NULL; 83453541Sshin } 83562587Sitojun 83662587Sitojun freeit: 83762587Sitojun m_freem(m); 83878064Sume return; 83978064Sume 84078064Sume bad: 84178064Sume icmp6stat.icp6s_badna++; 84278064Sume m_freem(m); 84353541Sshin} 84453541Sshin 84553541Sshin/* 84653541Sshin * Neighbor advertisement output handling. 84753541Sshin * 84853541Sshin * Based on RFC 2461 84953541Sshin * 85062587Sitojun * the following items are not implemented yet: 85162587Sitojun * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 85262587Sitojun * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 85353541Sshin */ 85453541Sshinvoid 855148385Sumend6_na_output(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0) 85653541Sshin struct ifnet *ifp; 857148385Sume const struct in6_addr *daddr6_0, *taddr6; 85853541Sshin u_long flags; 85962587Sitojun int tlladdr; /* 1 if include target link-layer address */ 86062587Sitojun struct sockaddr *sdl0; /* sockaddr_dl (= proxy NA) or NULL */ 86153541Sshin{ 86253541Sshin struct mbuf *m; 86353541Sshin struct ip6_hdr *ip6; 86453541Sshin struct nd_neighbor_advert *nd_na; 86553541Sshin struct ip6_moptions im6o; 866148385Sume struct in6_addr *src, daddr6; 867148385Sume struct sockaddr_in6 dst_sa; 868148385Sume int icmp6len, maxlen, error; 86992733Speter caddr_t mac = NULL; 870148385Sume struct route_in6 ro; 87162587Sitojun 872148385Sume bzero(&ro, sizeof(ro)); 873148385Sume 874148385Sume daddr6 = *daddr6_0; /* make a local copy for modification */ 875148385Sume 87662587Sitojun /* estimate the size of message */ 87762587Sitojun maxlen = sizeof(*ip6) + sizeof(*nd_na); 87862587Sitojun maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 87962587Sitojun if (max_linkhdr + maxlen >= MCLBYTES) { 88062587Sitojun#ifdef DIAGNOSTIC 88162587Sitojun printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES " 88262587Sitojun "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 88362587Sitojun#endif 88453541Sshin return; 88562587Sitojun } 88653541Sshin 887111119Simp MGETHDR(m, M_DONTWAIT, MT_DATA); 88862587Sitojun if (m && max_linkhdr + maxlen >= MHLEN) { 889111119Simp MCLGET(m, M_DONTWAIT); 89062587Sitojun if ((m->m_flags & M_EXT) == 0) { 89162587Sitojun m_free(m); 89262587Sitojun m = NULL; 89362587Sitojun } 89462587Sitojun } 89562587Sitojun if (m == NULL) 89662587Sitojun return; 89778064Sume m->m_pkthdr.rcvif = NULL; 89862587Sitojun 899148385Sume if (IN6_IS_ADDR_MULTICAST(&daddr6)) { 90053541Sshin m->m_flags |= M_MCAST; 90153541Sshin im6o.im6o_multicast_ifp = ifp; 90253541Sshin im6o.im6o_multicast_hlim = 255; 90353541Sshin im6o.im6o_multicast_loop = 0; 90453541Sshin } 90553541Sshin 90653541Sshin icmp6len = sizeof(*nd_na); 90753541Sshin m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len; 90895023Ssuz m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 90953541Sshin 91053541Sshin /* fill neighbor advertisement packet */ 91153541Sshin ip6 = mtod(m, struct ip6_hdr *); 91253541Sshin ip6->ip6_flow = 0; 91362587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 91462587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 91553541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 91653541Sshin ip6->ip6_hlim = 255; 917148385Sume if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) { 91853541Sshin /* reply to DAD */ 919153227Sume daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 920153227Sume daddr6.s6_addr16[1] = 0; 921153227Sume daddr6.s6_addr32[1] = 0; 922153227Sume daddr6.s6_addr32[2] = 0; 923153227Sume daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE; 924148385Sume if (in6_setscope(&daddr6, ifp, NULL)) 925148385Sume goto bad; 926148385Sume 92753541Sshin flags &= ~ND_NA_FLAG_SOLICITED; 928148385Sume } 929148385Sume ip6->ip6_dst = daddr6; 930148385Sume bzero(&dst_sa, sizeof(struct sockaddr_in6)); 931148385Sume dst_sa.sin6_family = AF_INET6; 932148385Sume dst_sa.sin6_len = sizeof(struct sockaddr_in6); 933148385Sume dst_sa.sin6_addr = daddr6; 93453541Sshin 93553541Sshin /* 93653541Sshin * Select a source whose scope is the same as that of the dest. 93753541Sshin */ 938148385Sume bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa)); 939148385Sume src = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, NULL, &error); 940148385Sume if (src == NULL) { 941148385Sume nd6log((LOG_DEBUG, "nd6_na_output: source can't be " 942148385Sume "determined: dst=%s, error=%d\n", 943148385Sume ip6_sprintf(&dst_sa.sin6_addr), error)); 944148385Sume goto bad; 94553541Sshin } 946148385Sume ip6->ip6_src = *src; 94753541Sshin nd_na = (struct nd_neighbor_advert *)(ip6 + 1); 94853541Sshin nd_na->nd_na_type = ND_NEIGHBOR_ADVERT; 94953541Sshin nd_na->nd_na_code = 0; 95053541Sshin nd_na->nd_na_target = *taddr6; 951121315Sume in6_clearscope(&nd_na->nd_na_target); /* XXX */ 95253541Sshin 95353541Sshin /* 95453541Sshin * "tlladdr" indicates NS's condition for adding tlladdr or not. 95553541Sshin * see nd6_ns_input() for details. 95653541Sshin * Basically, if NS packet is sent to unicast/anycast addr, 95753541Sshin * target lladdr option SHOULD NOT be included. 95853541Sshin */ 95962587Sitojun if (tlladdr) { 96062587Sitojun /* 96162587Sitojun * sdl0 != NULL indicates proxy NA. If we do proxy, use 96262587Sitojun * lladdr in sdl0. If we are not proxying (sending NA for 96362587Sitojun * my address) use lladdr configured for the interface. 96462587Sitojun */ 965142215Sglebius if (sdl0 == NULL) { 966142215Sglebius#ifdef DEV_CARP 967142215Sglebius if (ifp->if_carp) 968142215Sglebius mac = carp_macmatch6(ifp->if_carp, m, taddr6); 969142215Sglebius if (mac == NULL) 970142215Sglebius mac = nd6_ifptomac(ifp); 971142215Sglebius#else 97262587Sitojun mac = nd6_ifptomac(ifp); 973142215Sglebius#endif 974142215Sglebius } else if (sdl0->sa_family == AF_LINK) { 97562587Sitojun struct sockaddr_dl *sdl; 97662587Sitojun sdl = (struct sockaddr_dl *)sdl0; 97762587Sitojun if (sdl->sdl_alen == ifp->if_addrlen) 97862587Sitojun mac = LLADDR(sdl); 97962587Sitojun } 98062587Sitojun } 98162587Sitojun if (tlladdr && mac) { 98253541Sshin int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 98353541Sshin struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1); 984120941Sume 98553541Sshin /* roundup to 8 bytes alignment! */ 98653541Sshin optlen = (optlen + 7) & ~7; 98753541Sshin 98853541Sshin m->m_pkthdr.len += optlen; 98953541Sshin m->m_len += optlen; 99053541Sshin icmp6len += optlen; 99153541Sshin bzero((caddr_t)nd_opt, optlen); 99253541Sshin nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 99353541Sshin nd_opt->nd_opt_len = optlen >> 3; 99453541Sshin bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 99553541Sshin } else 99653541Sshin flags &= ~ND_NA_FLAG_OVERRIDE; 99753541Sshin 99853541Sshin ip6->ip6_plen = htons((u_short)icmp6len); 99953541Sshin nd_na->nd_na_flags_reserved = flags; 100053541Sshin nd_na->nd_na_cksum = 0; 100153541Sshin nd_na->nd_na_cksum = 1002120941Sume in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len); 100353541Sshin 1004148385Sume ip6_output(m, NULL, &ro, 0, &im6o, NULL, NULL); 1005148385Sume icmp6_ifstat_inc(ifp, ifs6_out_msg); 1006148385Sume icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert); 1007148385Sume icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++; 1008148385Sume 1009148385Sume if (ro.ro_rt) { /* we don't cache this route. */ 1010148385Sume RTFREE(ro.ro_rt); 101153541Sshin } 1012148385Sume return; 1013148385Sume 1014148385Sume bad: 1015148385Sume if (ro.ro_rt) { 1016148385Sume RTFREE(ro.ro_rt); 1017148385Sume } 1018148385Sume m_freem(m); 1019148385Sume return; 102053541Sshin} 102153541Sshin 102253541Sshincaddr_t 102353541Sshinnd6_ifptomac(ifp) 102453541Sshin struct ifnet *ifp; 102553541Sshin{ 102653541Sshin switch (ifp->if_type) { 102753541Sshin case IFT_ARCNET: 102853541Sshin case IFT_ETHER: 102953541Sshin case IFT_FDDI: 103078064Sume case IFT_IEEE1394: 103178468Ssumikawa#ifdef IFT_L2VLAN 103278468Ssumikawa case IFT_L2VLAN: 103378468Ssumikawa#endif 103478064Sume#ifdef IFT_IEEE80211 103578064Sume case IFT_IEEE80211: 103678064Sume#endif 1037142215Sglebius#ifdef IFT_CARP 1038142215Sglebius case IFT_CARP: 1039142215Sglebius#endif 1040149829Sthompsa case IFT_BRIDGE: 1041120049Smdodd case IFT_ISO88025: 1042147306Sbrooks return IF_LLADDR(ifp); 104353541Sshin default: 104453541Sshin return NULL; 104553541Sshin } 104653541Sshin} 104753541Sshin 104860938SjakeTAILQ_HEAD(dadq_head, dadq); 104953541Sshinstruct dadq { 105060938Sjake TAILQ_ENTRY(dadq) dad_list; 105153541Sshin struct ifaddr *dad_ifa; 105253541Sshin int dad_count; /* max NS to send */ 105362587Sitojun int dad_ns_tcount; /* # of trials to send NS */ 105453541Sshin int dad_ns_ocount; /* NS sent so far */ 105553541Sshin int dad_ns_icount; 105653541Sshin int dad_na_icount; 105778064Sume struct callout dad_timer_ch; 105853541Sshin}; 105953541Sshin 106053541Sshinstatic struct dadq_head dadq; 106178064Sumestatic int dad_init = 0; 106253541Sshin 106353541Sshinstatic struct dadq * 106453541Sshinnd6_dad_find(ifa) 106553541Sshin struct ifaddr *ifa; 106653541Sshin{ 106753541Sshin struct dadq *dp; 106853541Sshin 106962587Sitojun for (dp = dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) { 107053541Sshin if (dp->dad_ifa == ifa) 107153541Sshin return dp; 107253541Sshin } 107353541Sshin return NULL; 107453541Sshin} 107553541Sshin 107678064Sumestatic void 107778064Sumend6_dad_starttimer(dp, ticks) 107878064Sume struct dadq *dp; 107978064Sume int ticks; 108078064Sume{ 108178064Sume 108278064Sume callout_reset(&dp->dad_timer_ch, ticks, 108378064Sume (void (*) __P((void *)))nd6_dad_timer, (void *)dp->dad_ifa); 108478064Sume} 108578064Sume 108678064Sumestatic void 108778064Sumend6_dad_stoptimer(dp) 108878064Sume struct dadq *dp; 108978064Sume{ 109078064Sume 109178064Sume callout_stop(&dp->dad_timer_ch); 109278064Sume} 109378064Sume 109453541Sshin/* 1095148987Sume * Start Duplicate Address Detection (DAD) for specified interface address. 109653541Sshin */ 109753541Sshinvoid 1098151539Ssuznd6_dad_start(ifa, delay) 109953541Sshin struct ifaddr *ifa; 1100151539Ssuz int delay; 110153541Sshin{ 110253541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 110353541Sshin struct dadq *dp; 110453541Sshin 110553541Sshin if (!dad_init) { 110653541Sshin TAILQ_INIT(&dadq); 110753541Sshin dad_init++; 110853541Sshin } 110953541Sshin 111053541Sshin /* 111153541Sshin * If we don't need DAD, don't do it. 111253541Sshin * There are several cases: 111353541Sshin * - DAD is disabled (ip6_dad_count == 0) 111453541Sshin * - the interface address is anycast 111553541Sshin */ 111653541Sshin if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) { 111762587Sitojun log(LOG_DEBUG, 111862587Sitojun "nd6_dad_start: called with non-tentative address " 111953541Sshin "%s(%s)\n", 112053541Sshin ip6_sprintf(&ia->ia_addr.sin6_addr), 112153541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 112253541Sshin return; 112353541Sshin } 112453541Sshin if (ia->ia6_flags & IN6_IFF_ANYCAST) { 112553541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 112653541Sshin return; 112753541Sshin } 112853541Sshin if (!ip6_dad_count) { 112953541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 113053541Sshin return; 113153541Sshin } 1132151465Ssuz if (ifa->ifa_ifp == NULL) 113353541Sshin panic("nd6_dad_start: ifa->ifa_ifp == NULL"); 1134120941Sume if (!(ifa->ifa_ifp->if_flags & IFF_UP)) { 113553541Sshin return; 1136120941Sume } 113753541Sshin if (nd6_dad_find(ifa) != NULL) { 113853541Sshin /* DAD already in progress */ 113953541Sshin return; 114053541Sshin } 114153541Sshin 114253541Sshin dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT); 114353541Sshin if (dp == NULL) { 114462587Sitojun log(LOG_ERR, "nd6_dad_start: memory allocation failed for " 114553541Sshin "%s(%s)\n", 114653541Sshin ip6_sprintf(&ia->ia_addr.sin6_addr), 114753541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 114853541Sshin return; 114953541Sshin } 115053541Sshin bzero(dp, sizeof(*dp)); 115178064Sume callout_init(&dp->dad_timer_ch, 0); 115253541Sshin TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list); 115353541Sshin 115478064Sume nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp), 115578064Sume ip6_sprintf(&ia->ia_addr.sin6_addr))); 115653541Sshin 115753541Sshin /* 115853541Sshin * Send NS packet for DAD, ip6_dad_count times. 115953541Sshin * Note that we must delay the first transmission, if this is the 116053541Sshin * first packet to be sent from the interface after interface 116153541Sshin * (re)initialization. 116253541Sshin */ 116353541Sshin dp->dad_ifa = ifa; 116495023Ssuz IFAREF(ifa); /* just for safety */ 116553541Sshin dp->dad_count = ip6_dad_count; 116653541Sshin dp->dad_ns_icount = dp->dad_na_icount = 0; 116762587Sitojun dp->dad_ns_ocount = dp->dad_ns_tcount = 0; 1168151539Ssuz if (delay == 0) { 116962587Sitojun nd6_dad_ns_output(dp, ifa); 1170121161Sume nd6_dad_starttimer(dp, 1171151539Ssuz (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 117253541Sshin } else { 1173151539Ssuz nd6_dad_starttimer(dp, delay); 117453541Sshin } 117553541Sshin} 117653541Sshin 117778064Sume/* 117878064Sume * terminate DAD unconditionally. used for address removals. 117978064Sume */ 118078064Sumevoid 118178064Sumend6_dad_stop(ifa) 118278064Sume struct ifaddr *ifa; 118378064Sume{ 118478064Sume struct dadq *dp; 118578064Sume 118678064Sume if (!dad_init) 118778064Sume return; 118878064Sume dp = nd6_dad_find(ifa); 118978064Sume if (!dp) { 119078064Sume /* DAD wasn't started yet */ 119178064Sume return; 119278064Sume } 119378064Sume 119478064Sume nd6_dad_stoptimer(dp); 119578064Sume 119678064Sume TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 119778064Sume free(dp, M_IP6NDP); 119878064Sume dp = NULL; 119978064Sume IFAFREE(ifa); 120078064Sume} 120178064Sume 120253541Sshinstatic void 120353541Sshinnd6_dad_timer(ifa) 120453541Sshin struct ifaddr *ifa; 120553541Sshin{ 120653541Sshin int s; 120753541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 120853541Sshin struct dadq *dp; 120953541Sshin 121095023Ssuz s = splnet(); /* XXX */ 121153541Sshin 121253541Sshin /* Sanity check */ 121353541Sshin if (ia == NULL) { 121462587Sitojun log(LOG_ERR, "nd6_dad_timer: called with null parameter\n"); 121553541Sshin goto done; 121653541Sshin } 121753541Sshin dp = nd6_dad_find(ifa); 121853541Sshin if (dp == NULL) { 121962587Sitojun log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n"); 122053541Sshin goto done; 122153541Sshin } 122253541Sshin if (ia->ia6_flags & IN6_IFF_DUPLICATED) { 122362587Sitojun log(LOG_ERR, "nd6_dad_timer: called with duplicated address " 122453541Sshin "%s(%s)\n", 122553541Sshin ip6_sprintf(&ia->ia_addr.sin6_addr), 122653541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 122753541Sshin goto done; 122853541Sshin } 122953541Sshin if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) { 123062587Sitojun log(LOG_ERR, "nd6_dad_timer: called with non-tentative address " 123153541Sshin "%s(%s)\n", 123253541Sshin ip6_sprintf(&ia->ia_addr.sin6_addr), 123353541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 123453541Sshin goto done; 123553541Sshin } 123653541Sshin 123762587Sitojun /* timeouted with IFF_{RUNNING,UP} check */ 123862587Sitojun if (dp->dad_ns_tcount > dad_maxtry) { 123978064Sume nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n", 1240120941Sume if_name(ifa->ifa_ifp))); 124162587Sitojun 124262587Sitojun TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 124362587Sitojun free(dp, M_IP6NDP); 124462587Sitojun dp = NULL; 124562587Sitojun IFAFREE(ifa); 124662587Sitojun goto done; 124762587Sitojun } 124862587Sitojun 124953541Sshin /* Need more checks? */ 125053541Sshin if (dp->dad_ns_ocount < dp->dad_count) { 125153541Sshin /* 125253541Sshin * We have more NS to go. Send NS packet for DAD. 125353541Sshin */ 125462587Sitojun nd6_dad_ns_output(dp, ifa); 1255120941Sume nd6_dad_starttimer(dp, 1256151539Ssuz (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 125753541Sshin } else { 125853541Sshin /* 125953541Sshin * We have transmitted sufficient number of DAD packets. 126053541Sshin * See what we've got. 126153541Sshin */ 126253541Sshin int duplicate; 126353541Sshin 126453541Sshin duplicate = 0; 126553541Sshin 126653541Sshin if (dp->dad_na_icount) { 126753541Sshin /* 126853541Sshin * the check is in nd6_dad_na_input(), 126953541Sshin * but just in case 127053541Sshin */ 127153541Sshin duplicate++; 127253541Sshin } 127353541Sshin 127453541Sshin if (dp->dad_ns_icount) { 127553541Sshin /* We've seen NS, means DAD has failed. */ 127653541Sshin duplicate++; 127753541Sshin } 127853541Sshin 127953541Sshin if (duplicate) { 128053541Sshin /* (*dp) will be freed in nd6_dad_duplicated() */ 128153541Sshin dp = NULL; 128253541Sshin nd6_dad_duplicated(ifa); 128353541Sshin } else { 128453541Sshin /* 128553541Sshin * We are done with DAD. No NA came, no NS came. 1286148987Sume * No duplicate address found. 128753541Sshin */ 128853541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 128953541Sshin 129078064Sume nd6log((LOG_DEBUG, 129162587Sitojun "%s: DAD complete for %s - no duplicates found\n", 129262587Sitojun if_name(ifa->ifa_ifp), 129378064Sume ip6_sprintf(&ia->ia_addr.sin6_addr))); 129453541Sshin 129553541Sshin TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 129653541Sshin free(dp, M_IP6NDP); 129753541Sshin dp = NULL; 129862587Sitojun IFAFREE(ifa); 129953541Sshin } 130053541Sshin } 130153541Sshin 130253541Sshindone: 130353541Sshin splx(s); 130453541Sshin} 130553541Sshin 130653541Sshinvoid 130753541Sshinnd6_dad_duplicated(ifa) 130853541Sshin struct ifaddr *ifa; 130953541Sshin{ 131053541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1311151477Ssuz struct ifnet *ifp; 131253541Sshin struct dadq *dp; 131353541Sshin 131453541Sshin dp = nd6_dad_find(ifa); 131553541Sshin if (dp == NULL) { 131662587Sitojun log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n"); 131753541Sshin return; 131853541Sshin } 131953541Sshin 132078064Sume log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: " 132178064Sume "NS in/out=%d/%d, NA in=%d\n", 132278064Sume if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr), 132378064Sume dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount); 132453541Sshin 132553541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 132653541Sshin ia->ia6_flags |= IN6_IFF_DUPLICATED; 132753541Sshin 1328148987Sume /* We are done with DAD, with duplicate address found. (failure) */ 132978064Sume nd6_dad_stoptimer(dp); 133053541Sshin 1331151477Ssuz ifp = ifa->ifa_ifp; 133262587Sitojun log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n", 1333151477Ssuz if_name(ifp), ip6_sprintf(&ia->ia_addr.sin6_addr)); 133462587Sitojun log(LOG_ERR, "%s: manual intervention required\n", 1335151477Ssuz if_name(ifp)); 133653541Sshin 1337151477Ssuz /* 1338151477Ssuz * If the address is a link-local address formed from an interface 1339151477Ssuz * identifier based on the hardware address which is supposed to be 1340151477Ssuz * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP 1341151477Ssuz * operation on the interface SHOULD be disabled. 1342151477Ssuz * [rfc2462bis-03 Section 5.4.5] 1343151477Ssuz */ 1344151477Ssuz if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) { 1345151477Ssuz struct in6_addr in6; 1346151477Ssuz 1347151477Ssuz /* 1348151477Ssuz * To avoid over-reaction, we only apply this logic when we are 1349151477Ssuz * very sure that hardware addresses are supposed to be unique. 1350151477Ssuz */ 1351151477Ssuz switch (ifp->if_type) { 1352151477Ssuz case IFT_ETHER: 1353151477Ssuz case IFT_FDDI: 1354151477Ssuz case IFT_ATM: 1355151477Ssuz case IFT_IEEE1394: 1356151477Ssuz#ifdef IFT_IEEE80211 1357151477Ssuz case IFT_IEEE80211: 1358151477Ssuz#endif 1359151477Ssuz in6 = ia->ia_addr.sin6_addr; 1360151477Ssuz if (in6_get_hw_ifid(ifp, &in6) == 0 && 1361151477Ssuz IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) { 1362151477Ssuz ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED; 1363151477Ssuz log(LOG_ERR, "%s: possible hardware address " 1364151477Ssuz "duplication detected, disable IPv6\n", 1365151477Ssuz if_name(ifp)); 1366151477Ssuz } 1367151477Ssuz break; 1368151477Ssuz } 1369151477Ssuz } 1370151477Ssuz 137153541Sshin TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 137253541Sshin free(dp, M_IP6NDP); 137353541Sshin dp = NULL; 137462587Sitojun IFAFREE(ifa); 137553541Sshin} 137653541Sshin 137762587Sitojunstatic void 137862587Sitojunnd6_dad_ns_output(dp, ifa) 137962587Sitojun struct dadq *dp; 138062587Sitojun struct ifaddr *ifa; 138162587Sitojun{ 138262587Sitojun struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 138362587Sitojun struct ifnet *ifp = ifa->ifa_ifp; 138462587Sitojun 138562587Sitojun dp->dad_ns_tcount++; 138662587Sitojun if ((ifp->if_flags & IFF_UP) == 0) { 138762587Sitojun return; 138862587Sitojun } 1389148887Srwatson if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 139062587Sitojun return; 139162587Sitojun } 139262587Sitojun 139362587Sitojun dp->dad_ns_ocount++; 139462587Sitojun nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1); 139562587Sitojun} 139662587Sitojun 139762587Sitojunstatic void 139853541Sshinnd6_dad_ns_input(ifa) 139953541Sshin struct ifaddr *ifa; 140053541Sshin{ 140153541Sshin struct in6_ifaddr *ia; 140253541Sshin struct ifnet *ifp; 140378064Sume const struct in6_addr *taddr6; 140453541Sshin struct dadq *dp; 140553541Sshin int duplicate; 140653541Sshin 1407151465Ssuz if (ifa == NULL) 140853541Sshin panic("ifa == NULL in nd6_dad_ns_input"); 140953541Sshin 141053541Sshin ia = (struct in6_ifaddr *)ifa; 141153541Sshin ifp = ifa->ifa_ifp; 141253541Sshin taddr6 = &ia->ia_addr.sin6_addr; 141353541Sshin duplicate = 0; 141453541Sshin dp = nd6_dad_find(ifa); 141553541Sshin 141653541Sshin /* Quickhack - completely ignore DAD NS packets */ 141753541Sshin if (dad_ignore_ns) { 141878064Sume nd6log((LOG_INFO, 141978064Sume "nd6_dad_ns_input: ignoring DAD NS packet for " 142053541Sshin "address %s(%s)\n", ip6_sprintf(taddr6), 142178064Sume if_name(ifa->ifa_ifp))); 142253541Sshin return; 142353541Sshin } 142453541Sshin 142553541Sshin /* 142653541Sshin * if I'm yet to start DAD, someone else started using this address 142753541Sshin * first. I have a duplicate and you win. 142853541Sshin */ 1429151465Ssuz if (dp == NULL || dp->dad_ns_ocount == 0) 143053541Sshin duplicate++; 143153541Sshin 143253541Sshin /* XXX more checks for loopback situation - see nd6_dad_timer too */ 143353541Sshin 143453541Sshin if (duplicate) { 143553541Sshin dp = NULL; /* will be freed in nd6_dad_duplicated() */ 143653541Sshin nd6_dad_duplicated(ifa); 143753541Sshin } else { 143853541Sshin /* 143953541Sshin * not sure if I got a duplicate. 144053541Sshin * increment ns count and see what happens. 144153541Sshin */ 144253541Sshin if (dp) 144353541Sshin dp->dad_ns_icount++; 144453541Sshin } 144553541Sshin} 144653541Sshin 144762587Sitojunstatic void 144853541Sshinnd6_dad_na_input(ifa) 144953541Sshin struct ifaddr *ifa; 145053541Sshin{ 145153541Sshin struct dadq *dp; 145253541Sshin 1453151465Ssuz if (ifa == NULL) 145453541Sshin panic("ifa == NULL in nd6_dad_na_input"); 145553541Sshin 145653541Sshin dp = nd6_dad_find(ifa); 145753541Sshin if (dp) 145853541Sshin dp->dad_na_icount++; 145953541Sshin 146053541Sshin /* remove the address. */ 146153541Sshin nd6_dad_duplicated(ifa); 146253541Sshin} 1463