nd6_nbr.c revision 165118
162587Sitojun/* $FreeBSD: head/sys/netinet6/nd6_nbr.c 165118 2006-12-12 12:17:58Z bz $ */ 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 7162587Sitojun#define SDL(s) ((struct sockaddr_dl *)s) 7253541Sshin 7362587Sitojunstruct dadq; 7462587Sitojunstatic struct dadq *nd6_dad_find __P((struct ifaddr *)); 7578064Sumestatic void nd6_dad_starttimer __P((struct dadq *, int)); 7678064Sumestatic void nd6_dad_stoptimer __P((struct dadq *)); 7762587Sitojunstatic void nd6_dad_timer __P((struct ifaddr *)); 7862587Sitojunstatic void nd6_dad_ns_output __P((struct dadq *, struct ifaddr *)); 7962587Sitojunstatic void nd6_dad_ns_input __P((struct ifaddr *)); 8062587Sitojunstatic void nd6_dad_na_input __P((struct ifaddr *)); 8153541Sshin 8262587Sitojunstatic int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/ 8362587Sitojunstatic int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */ 8453541Sshin 8553541Sshin/* 86108470Sschweikh * Input a Neighbor Solicitation Message. 8753541Sshin * 8853541Sshin * Based on RFC 2461 89148987Sume * Based on RFC 2462 (duplicate address detection) 9053541Sshin */ 9153541Sshinvoid 9253541Sshinnd6_ns_input(m, off, icmp6len) 9353541Sshin struct mbuf *m; 9453541Sshin int off, icmp6len; 9553541Sshin{ 9653541Sshin struct ifnet *ifp = m->m_pkthdr.rcvif; 9753541Sshin struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 9862587Sitojun struct nd_neighbor_solicit *nd_ns; 9953541Sshin struct in6_addr saddr6 = ip6->ip6_src; 10053541Sshin struct in6_addr daddr6 = ip6->ip6_dst; 10162587Sitojun struct in6_addr taddr6; 10253541Sshin struct in6_addr myaddr6; 10353541Sshin char *lladdr = NULL; 104142215Sglebius struct ifaddr *ifa = NULL; 10553541Sshin int lladdrlen = 0; 10653541Sshin int anycast = 0, proxy = 0, tentative = 0; 10753541Sshin int tlladdr; 10853541Sshin union nd_opts ndopts; 10962587Sitojun struct sockaddr_dl *proxydl = NULL; 110165118Sbz char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 11153541Sshin 11278064Sume#ifndef PULLDOWN_TEST 11378064Sume IP6_EXTHDR_CHECK(m, off, icmp6len,); 11478064Sume nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off); 11578064Sume#else 11678064Sume IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len); 11778064Sume if (nd_ns == NULL) { 11878064Sume icmp6stat.icp6s_tooshort++; 11978064Sume return; 12078064Sume } 12178064Sume#endif 12278064Sume ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */ 12378064Sume taddr6 = nd_ns->nd_ns_target; 124148385Sume if (in6_setscope(&taddr6, ifp, NULL) != 0) 125148385Sume goto bad; 12678064Sume 12753541Sshin if (ip6->ip6_hlim != 255) { 12878064Sume nd6log((LOG_ERR, 12978064Sume "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n", 130165118Sbz ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 131165118Sbz ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 13278064Sume goto bad; 13353541Sshin } 13453541Sshin 13553541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 136148987Sume /* dst has to be a solicited node multicast address. */ 137120941Sume if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL && 13895023Ssuz /* don't check ifindex portion */ 139120941Sume daddr6.s6_addr32[1] == 0 && 140120941Sume daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE && 141120941Sume daddr6.s6_addr8[12] == 0xff) { 14295023Ssuz ; /* good */ 14353541Sshin } else { 14478064Sume nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 145120941Sume "(wrong ip6 dst)\n")); 14653541Sshin goto bad; 14753541Sshin } 14853541Sshin } 14953541Sshin 15053541Sshin if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 15178064Sume nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n")); 15253541Sshin goto bad; 15353541Sshin } 15453541Sshin 15553541Sshin icmp6len -= sizeof(*nd_ns); 15653541Sshin nd6_option_init(nd_ns + 1, icmp6len, &ndopts); 15753541Sshin if (nd6_options(&ndopts) < 0) { 15878064Sume nd6log((LOG_INFO, 15978064Sume "nd6_ns_input: invalid ND option, ignored\n")); 16078064Sume /* nd6_options have incremented stats */ 16178064Sume goto freeit; 16253541Sshin } 16353541Sshin 16453541Sshin if (ndopts.nd_opts_src_lladdr) { 16595023Ssuz lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 16653541Sshin lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 16753541Sshin } 168120941Sume 16953541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) { 17078064Sume nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 17178064Sume "(link-layer address option)\n")); 17253541Sshin goto bad; 17353541Sshin } 17453541Sshin 17553541Sshin /* 17653541Sshin * Attaching target link-layer address to the NA? 17753541Sshin * (RFC 2461 7.2.4) 17853541Sshin * 17953541Sshin * NS IP dst is unicast/anycast MUST NOT add 18053541Sshin * NS IP dst is solicited-node multicast MUST add 18153541Sshin * 18253541Sshin * In implementation, we add target link-layer address by default. 18353541Sshin * We do not add one in MUST NOT cases. 18453541Sshin */ 18553541Sshin if (!IN6_IS_ADDR_MULTICAST(&daddr6)) 18653541Sshin tlladdr = 0; 18753541Sshin else 18853541Sshin tlladdr = 1; 18953541Sshin 19053541Sshin /* 19153541Sshin * Target address (taddr6) must be either: 19253541Sshin * (1) Valid unicast/anycast address for my receiving interface, 19353541Sshin * (2) Unicast address for which I'm offering proxy service, or 19453541Sshin * (3) "tentative" address on which DAD is being performed. 19553541Sshin */ 19653541Sshin /* (1) and (3) check. */ 197142215Sglebius#ifdef DEV_CARP 198142215Sglebius if (ifp->if_carp) 199142215Sglebius ifa = carp_iamatch6(ifp->if_carp, &taddr6); 200151465Ssuz if (ifa == NULL) 201142215Sglebius ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 202142215Sglebius#else 20353541Sshin ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 204142215Sglebius#endif 20553541Sshin 20653541Sshin /* (2) check. */ 207151465Ssuz if (ifa == NULL) { 20853541Sshin struct rtentry *rt; 20953541Sshin struct sockaddr_in6 tsin6; 210121765Ssam int need_proxy; 21153541Sshin 21253541Sshin bzero(&tsin6, sizeof tsin6); 21353541Sshin tsin6.sin6_len = sizeof(struct sockaddr_in6); 21453541Sshin tsin6.sin6_family = AF_INET6; 21553541Sshin tsin6.sin6_addr = taddr6; 21653541Sshin 21753541Sshin rt = rtalloc1((struct sockaddr *)&tsin6, 0, 0); 218121765Ssam need_proxy = (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 && 219121765Ssam rt->rt_gateway->sa_family == AF_LINK); 220121765Ssam if (rt) 221121765Ssam rtfree(rt); 222121765Ssam if (need_proxy) { 22353541Sshin /* 22462587Sitojun * proxy NDP for single entry 22553541Sshin */ 22662587Sitojun ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 22762587Sitojun IN6_IFF_NOTREADY|IN6_IFF_ANYCAST); 22862587Sitojun if (ifa) { 22953541Sshin proxy = 1; 23062587Sitojun proxydl = SDL(rt->rt_gateway); 23162587Sitojun } 23253541Sshin } 23353541Sshin } 234151479Ssuz if (ifa == NULL) { 23553541Sshin /* 23678064Sume * We've got an NS packet, and we don't have that adddress 23753541Sshin * assigned for us. We MUST silently ignore it. 23853541Sshin * See RFC2461 7.2.3. 23953541Sshin */ 24062587Sitojun goto freeit; 24153541Sshin } 24253541Sshin myaddr6 = *IFA_IN6(ifa); 24353541Sshin anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST; 24453541Sshin tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE; 24553541Sshin if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED) 24662587Sitojun goto freeit; 24753541Sshin 24853541Sshin if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 249120941Sume nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s " 25053541Sshin "(if %d, NS packet %d)\n", 251165118Sbz ip6_sprintf(ip6bufs, &taddr6), 252120941Sume ifp->if_addrlen, lladdrlen - 2)); 25378064Sume goto bad; 25453541Sshin } 25553541Sshin 25653541Sshin if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) { 257120941Sume nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n", 258165118Sbz ip6_sprintf(ip6bufs, &saddr6))); 25962587Sitojun goto freeit; 26053541Sshin } 26153541Sshin 26253541Sshin /* 26353541Sshin * We have neighbor solicitation packet, with target address equals to 26453541Sshin * one of my tentative address. 26553541Sshin * 26653541Sshin * src addr how to process? 26753541Sshin * --- --- 26853541Sshin * multicast of course, invalid (rejected in ip6_input) 26953541Sshin * unicast somebody is doing address resolution -> ignore 27053541Sshin * unspec dup address detection 27153541Sshin * 27253541Sshin * The processing is defined in RFC 2462. 27353541Sshin */ 27453541Sshin if (tentative) { 27553541Sshin /* 27653541Sshin * If source address is unspecified address, it is for 277148987Sume * duplicate address detection. 27853541Sshin * 27953541Sshin * If not, the packet is for addess resolution; 28053541Sshin * silently ignore it. 28153541Sshin */ 28253541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 28353541Sshin nd6_dad_ns_input(ifa); 28453541Sshin 28562587Sitojun goto freeit; 28653541Sshin } 28753541Sshin 28853541Sshin /* 28953541Sshin * If the source address is unspecified address, entries must not 29053541Sshin * be created or updated. 29153541Sshin * It looks that sender is performing DAD. Output NA toward 29253541Sshin * all-node multicast address, to tell the sender that I'm using 29353541Sshin * the address. 29453541Sshin * S bit ("solicited") must be zero. 29553541Sshin */ 29653541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 297148385Sume struct in6_addr in6_all; 298148385Sume 299148385Sume in6_all = in6addr_linklocal_allnodes; 300148385Sume if (in6_setscope(&in6_all, ifp, NULL) != 0) 301148385Sume goto bad; 302148385Sume nd6_na_output(ifp, &in6_all, &taddr6, 303120941Sume ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 304120941Sume (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0), 305120941Sume tlladdr, (struct sockaddr *)proxydl); 30662587Sitojun goto freeit; 30753541Sshin } 30853541Sshin 309120941Sume nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, 310120941Sume ND_NEIGHBOR_SOLICIT, 0); 31153541Sshin 31253541Sshin nd6_na_output(ifp, &saddr6, &taddr6, 313120941Sume ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 314120941Sume (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED, 315120941Sume tlladdr, (struct sockaddr *)proxydl); 31662587Sitojun freeit: 31762587Sitojun m_freem(m); 31853541Sshin return; 31953541Sshin 32053541Sshin bad: 321165118Sbz nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", 322165118Sbz ip6_sprintf(ip6bufs, &saddr6))); 323165118Sbz nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", 324165118Sbz ip6_sprintf(ip6bufs, &daddr6))); 325165118Sbz nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", 326165118Sbz ip6_sprintf(ip6bufs, &taddr6))); 32778064Sume icmp6stat.icp6s_badns++; 32862587Sitojun m_freem(m); 32953541Sshin} 33053541Sshin 33153541Sshin/* 332108470Sschweikh * Output a Neighbor Solicitation Message. Caller specifies: 33353541Sshin * - ICMP6 header source IP6 address 33453541Sshin * - ND6 header target IP6 address 33553541Sshin * - ND6 header source datalink address 33653541Sshin * 33753541Sshin * Based on RFC 2461 338148987Sume * Based on RFC 2462 (duplicate address detection) 33953541Sshin */ 34053541Sshinvoid 34153541Sshinnd6_ns_output(ifp, daddr6, taddr6, ln, dad) 34253541Sshin struct ifnet *ifp; 34378064Sume const struct in6_addr *daddr6, *taddr6; 34453541Sshin struct llinfo_nd6 *ln; /* for source address determination */ 345148987Sume int dad; /* duplicate address detection */ 34653541Sshin{ 34753541Sshin struct mbuf *m; 34853541Sshin struct ip6_hdr *ip6; 34953541Sshin struct nd_neighbor_solicit *nd_ns; 350148385Sume struct in6_addr *src, src_in; 35153541Sshin struct ip6_moptions im6o; 35253541Sshin int icmp6len; 35362587Sitojun int maxlen; 35453541Sshin caddr_t mac; 355148385Sume struct route_in6 ro; 356120941Sume 357148385Sume bzero(&ro, sizeof(ro)); 358148385Sume 35953541Sshin if (IN6_IS_ADDR_MULTICAST(taddr6)) 36053541Sshin return; 36153541Sshin 36262587Sitojun /* estimate the size of message */ 36362587Sitojun maxlen = sizeof(*ip6) + sizeof(*nd_ns); 36462587Sitojun maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 36562587Sitojun if (max_linkhdr + maxlen >= MCLBYTES) { 36662587Sitojun#ifdef DIAGNOSTIC 36762587Sitojun printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES " 36862587Sitojun "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 36962587Sitojun#endif 37053541Sshin return; 37162587Sitojun } 37253541Sshin 373111119Simp MGETHDR(m, M_DONTWAIT, MT_DATA); 37462587Sitojun if (m && max_linkhdr + maxlen >= MHLEN) { 375111119Simp MCLGET(m, M_DONTWAIT); 37662587Sitojun if ((m->m_flags & M_EXT) == 0) { 37762587Sitojun m_free(m); 37862587Sitojun m = NULL; 37962587Sitojun } 38062587Sitojun } 38162587Sitojun if (m == NULL) 38262587Sitojun return; 38378064Sume m->m_pkthdr.rcvif = NULL; 38462587Sitojun 38553541Sshin if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) { 38653541Sshin m->m_flags |= M_MCAST; 38753541Sshin im6o.im6o_multicast_ifp = ifp; 38853541Sshin im6o.im6o_multicast_hlim = 255; 38953541Sshin im6o.im6o_multicast_loop = 0; 39053541Sshin } 39153541Sshin 39253541Sshin icmp6len = sizeof(*nd_ns); 39353541Sshin m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len; 39495023Ssuz m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 39553541Sshin 39653541Sshin /* fill neighbor solicitation packet */ 39753541Sshin ip6 = mtod(m, struct ip6_hdr *); 39853541Sshin ip6->ip6_flow = 0; 39962587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 40062587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 40153541Sshin /* ip6->ip6_plen will be set later */ 40253541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 40353541Sshin ip6->ip6_hlim = 255; 40453541Sshin if (daddr6) 40553541Sshin ip6->ip6_dst = *daddr6; 40653541Sshin else { 40753541Sshin ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 408148385Sume ip6->ip6_dst.s6_addr16[1] = 0; 40953541Sshin ip6->ip6_dst.s6_addr32[1] = 0; 41053541Sshin ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE; 41153541Sshin ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3]; 41253541Sshin ip6->ip6_dst.s6_addr8[12] = 0xff; 413148385Sume if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 414148385Sume goto bad; 41553541Sshin } 41653541Sshin if (!dad) { 41753541Sshin /* 41853541Sshin * RFC2461 7.2.2: 41953541Sshin * "If the source address of the packet prompting the 42053541Sshin * solicitation is the same as one of the addresses assigned 42153541Sshin * to the outgoing interface, that address SHOULD be placed 42253541Sshin * in the IP Source Address of the outgoing solicitation. 42353541Sshin * Otherwise, any one of the addresses assigned to the 42453541Sshin * interface should be used." 42553541Sshin * 42653541Sshin * We use the source address for the prompting packet 42753541Sshin * (saddr6), if: 42853541Sshin * - saddr6 is given from the caller (by giving "ln"), and 42953541Sshin * - saddr6 belongs to the outgoing interface. 430148385Sume * Otherwise, we perform the source address selection as usual. 43153541Sshin */ 43295023Ssuz struct ip6_hdr *hip6; /* hold ip6 */ 433148385Sume struct in6_addr *hsrc = NULL; 43453541Sshin 43553541Sshin if (ln && ln->ln_hold) { 436148987Sume /* 437148987Sume * assuming every packet in ln_hold has the same IP 438148987Sume * header 439148987Sume */ 44053541Sshin hip6 = mtod(ln->ln_hold, struct ip6_hdr *); 44153541Sshin /* XXX pullup? */ 44253541Sshin if (sizeof(*hip6) < ln->ln_hold->m_len) 443148385Sume hsrc = &hip6->ip6_src; 44453541Sshin else 445148385Sume hsrc = NULL; 446148385Sume } 447148385Sume if (hsrc && in6ifa_ifpwithaddr(ifp, hsrc)) 448148385Sume src = hsrc; 44953541Sshin else { 450148385Sume int error; 451148385Sume struct sockaddr_in6 dst_sa; 452148385Sume 453148385Sume bzero(&dst_sa, sizeof(dst_sa)); 454148385Sume dst_sa.sin6_family = AF_INET6; 455148385Sume dst_sa.sin6_len = sizeof(dst_sa); 456148385Sume dst_sa.sin6_addr = ip6->ip6_dst; 457148385Sume 458148385Sume src = in6_selectsrc(&dst_sa, NULL, 459148385Sume NULL, &ro, NULL, NULL, &error); 460148385Sume if (src == NULL) { 461165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 462148385Sume nd6log((LOG_DEBUG, 463148385Sume "nd6_ns_output: source can't be " 464148385Sume "determined: dst=%s, error=%d\n", 465165118Sbz ip6_sprintf(ip6buf, &dst_sa.sin6_addr), 466165118Sbz error)); 467148385Sume goto bad; 46853541Sshin } 46953541Sshin } 47053541Sshin } else { 47153541Sshin /* 47253541Sshin * Source address for DAD packet must always be IPv6 47353541Sshin * unspecified address. (0::0) 474148385Sume * We actually don't have to 0-clear the address (we did it 475148385Sume * above), but we do so here explicitly to make the intention 476148385Sume * clearer. 47753541Sshin */ 478148385Sume bzero(&src_in, sizeof(src_in)); 479148385Sume src = &src_in; 48053541Sshin } 481148385Sume ip6->ip6_src = *src; 48253541Sshin nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1); 48353541Sshin nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT; 48453541Sshin nd_ns->nd_ns_code = 0; 48553541Sshin nd_ns->nd_ns_reserved = 0; 48653541Sshin nd_ns->nd_ns_target = *taddr6; 487121315Sume in6_clearscope(&nd_ns->nd_ns_target); /* XXX */ 48853541Sshin 48953541Sshin /* 49053541Sshin * Add source link-layer address option. 49153541Sshin * 49253541Sshin * spec implementation 49353541Sshin * --- --- 49453541Sshin * DAD packet MUST NOT do not add the option 49553541Sshin * there's no link layer address: 49653541Sshin * impossible do not add the option 49753541Sshin * there's link layer address: 49853541Sshin * Multicast NS MUST add one add the option 49953541Sshin * Unicast NS SHOULD add one add the option 50053541Sshin */ 50153541Sshin if (!dad && (mac = nd6_ifptomac(ifp))) { 50253541Sshin int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 50353541Sshin struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); 50453541Sshin /* 8 byte alignments... */ 50553541Sshin optlen = (optlen + 7) & ~7; 506120941Sume 50753541Sshin m->m_pkthdr.len += optlen; 50853541Sshin m->m_len += optlen; 50953541Sshin icmp6len += optlen; 51053541Sshin bzero((caddr_t)nd_opt, optlen); 51153541Sshin nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; 51253541Sshin nd_opt->nd_opt_len = optlen >> 3; 51353541Sshin bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 51453541Sshin } 51553541Sshin 51653541Sshin ip6->ip6_plen = htons((u_short)icmp6len); 51753541Sshin nd_ns->nd_ns_cksum = 0; 518120941Sume nd_ns->nd_ns_cksum = 519120941Sume in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len); 52053541Sshin 521151536Ssuz ip6_output(m, NULL, &ro, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL, NULL); 522148385Sume icmp6_ifstat_inc(ifp, ifs6_out_msg); 523148385Sume icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit); 524148385Sume icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++; 525148385Sume 526148385Sume if (ro.ro_rt) { /* we don't cache this route. */ 527148385Sume RTFREE(ro.ro_rt); 52853541Sshin } 529148385Sume return; 530148385Sume 531148385Sume bad: 532148385Sume if (ro.ro_rt) { 533148385Sume RTFREE(ro.ro_rt); 534148385Sume } 535148385Sume m_freem(m); 536148385Sume return; 53753541Sshin} 53853541Sshin 53953541Sshin/* 54053541Sshin * Neighbor advertisement input handling. 54153541Sshin * 54253541Sshin * Based on RFC 2461 543148987Sume * Based on RFC 2462 (duplicate address detection) 54462587Sitojun * 54562587Sitojun * the following items are not implemented yet: 54662587Sitojun * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 54762587Sitojun * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 54853541Sshin */ 54953541Sshinvoid 55053541Sshinnd6_na_input(m, off, icmp6len) 55153541Sshin struct mbuf *m; 55253541Sshin int off, icmp6len; 55353541Sshin{ 55453541Sshin struct ifnet *ifp = m->m_pkthdr.rcvif; 55553541Sshin struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 55662587Sitojun struct nd_neighbor_advert *nd_na; 55753541Sshin struct in6_addr daddr6 = ip6->ip6_dst; 55862587Sitojun struct in6_addr taddr6; 55962587Sitojun int flags; 56062587Sitojun int is_router; 56162587Sitojun int is_solicited; 56262587Sitojun int is_override; 56353541Sshin char *lladdr = NULL; 56453541Sshin int lladdrlen = 0; 56553541Sshin struct ifaddr *ifa; 56653541Sshin struct llinfo_nd6 *ln; 56753541Sshin struct rtentry *rt; 56853541Sshin struct sockaddr_dl *sdl; 56953541Sshin union nd_opts ndopts; 570165118Sbz char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 57153541Sshin 57253541Sshin if (ip6->ip6_hlim != 255) { 57378064Sume nd6log((LOG_ERR, 57478064Sume "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n", 575165118Sbz ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 576165118Sbz ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 57778064Sume goto bad; 57862587Sitojun } 57962587Sitojun 58062587Sitojun#ifndef PULLDOWN_TEST 58162587Sitojun IP6_EXTHDR_CHECK(m, off, icmp6len,); 58262587Sitojun nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off); 58362587Sitojun#else 58462587Sitojun IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len); 58562587Sitojun if (nd_na == NULL) { 58662587Sitojun icmp6stat.icp6s_tooshort++; 58753541Sshin return; 58853541Sshin } 58962587Sitojun#endif 590148385Sume 59162587Sitojun flags = nd_na->nd_na_flags_reserved; 59262587Sitojun is_router = ((flags & ND_NA_FLAG_ROUTER) != 0); 59362587Sitojun is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0); 59462587Sitojun is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0); 59553541Sshin 596148385Sume taddr6 = nd_na->nd_na_target; 597148385Sume if (in6_setscope(&taddr6, ifp, NULL)) 598150202Ssuz goto bad; /* XXX: impossible */ 59953541Sshin 60053541Sshin if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 60178064Sume nd6log((LOG_ERR, 60253541Sshin "nd6_na_input: invalid target address %s\n", 603165118Sbz ip6_sprintf(ip6bufs, &taddr6))); 60478064Sume goto bad; 60553541Sshin } 60653541Sshin if (IN6_IS_ADDR_MULTICAST(&daddr6)) 60753541Sshin if (is_solicited) { 60878064Sume nd6log((LOG_ERR, 60978064Sume "nd6_na_input: a solicited adv is multicasted\n")); 61078064Sume goto bad; 61153541Sshin } 61253541Sshin 61353541Sshin icmp6len -= sizeof(*nd_na); 61453541Sshin nd6_option_init(nd_na + 1, icmp6len, &ndopts); 61553541Sshin if (nd6_options(&ndopts) < 0) { 61678064Sume nd6log((LOG_INFO, 61778064Sume "nd6_na_input: invalid ND option, ignored\n")); 61878064Sume /* nd6_options have incremented stats */ 61962587Sitojun goto freeit; 62053541Sshin } 62153541Sshin 62253541Sshin if (ndopts.nd_opts_tgt_lladdr) { 62353541Sshin lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 62453541Sshin lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 62553541Sshin } 62653541Sshin 62753541Sshin ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 62853541Sshin 62953541Sshin /* 63053541Sshin * Target address matches one of my interface address. 63153541Sshin * 63253541Sshin * If my address is tentative, this means that there's somebody 63353541Sshin * already using the same address as mine. This indicates DAD failure. 63453541Sshin * This is defined in RFC 2462. 63553541Sshin * 63653541Sshin * Otherwise, process as defined in RFC 2461. 63753541Sshin */ 63853541Sshin if (ifa 63953541Sshin && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) { 64053541Sshin nd6_dad_na_input(ifa); 64162587Sitojun goto freeit; 64253541Sshin } 64353541Sshin 64495023Ssuz /* Just for safety, maybe unnecessary. */ 64553541Sshin if (ifa) { 64653541Sshin log(LOG_ERR, 64753541Sshin "nd6_na_input: duplicate IP6 address %s\n", 648165118Sbz ip6_sprintf(ip6bufs, &taddr6)); 64962587Sitojun goto freeit; 65053541Sshin } 65153541Sshin 65253541Sshin if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 653120941Sume nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s " 654165118Sbz "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6), 655120941Sume ifp->if_addrlen, lladdrlen - 2)); 65678064Sume goto bad; 65753541Sshin } 65853541Sshin 65953541Sshin /* 660120941Sume * If no neighbor cache entry is found, NA SHOULD silently be 661120941Sume * discarded. 66253541Sshin */ 66353541Sshin rt = nd6_lookup(&taddr6, 0, ifp); 66453541Sshin if ((rt == NULL) || 66553541Sshin ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) || 66653541Sshin ((sdl = SDL(rt->rt_gateway)) == NULL)) 66762587Sitojun goto freeit; 66853541Sshin 66953541Sshin if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 67053541Sshin /* 67153541Sshin * If the link-layer has address, and no lladdr option came, 67253541Sshin * discard the packet. 67353541Sshin */ 674151465Ssuz if (ifp->if_addrlen && lladdr == NULL) 67562587Sitojun goto freeit; 67653541Sshin 67753541Sshin /* 67853541Sshin * Record link-layer address, and update the state. 67953541Sshin */ 68053541Sshin sdl->sdl_alen = ifp->if_addrlen; 68153541Sshin bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 68253541Sshin if (is_solicited) { 68353541Sshin ln->ln_state = ND6_LLINFO_REACHABLE; 68462587Sitojun ln->ln_byhint = 0; 685151539Ssuz if (!ND6_LLINFO_PERMANENT(ln)) { 686151539Ssuz nd6_llinfo_settimer(ln, 687151539Ssuz (long)ND_IFINFO(rt->rt_ifp)->reachable * hz); 688120941Sume } 68978064Sume } else { 69053541Sshin ln->ln_state = ND6_LLINFO_STALE; 691151539Ssuz nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 69278064Sume } 69378064Sume if ((ln->ln_router = is_router) != 0) { 69478064Sume /* 69578064Sume * This means a router's state has changed from 69678064Sume * non-reachable to probably reachable, and might 69778064Sume * affect the status of associated prefixes.. 69878064Sume */ 69978064Sume pfxlist_onlink_check(); 70078064Sume } 70153541Sshin } else { 70253541Sshin int llchange; 70353541Sshin 70453541Sshin /* 70553541Sshin * Check if the link-layer address has changed or not. 70653541Sshin */ 707151465Ssuz if (lladdr == NULL) 70853541Sshin llchange = 0; 70953541Sshin else { 71053541Sshin if (sdl->sdl_alen) { 71153541Sshin if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 71253541Sshin llchange = 1; 71353541Sshin else 71453541Sshin llchange = 0; 71553541Sshin } else 71653541Sshin llchange = 1; 71753541Sshin } 71853541Sshin 71953541Sshin /* 72053541Sshin * This is VERY complex. Look at it with care. 72153541Sshin * 72253541Sshin * override solicit lladdr llchange action 72353541Sshin * (L: record lladdr) 72453541Sshin * 72553541Sshin * 0 0 n -- (2c) 72653541Sshin * 0 0 y n (2b) L 72753541Sshin * 0 0 y y (1) REACHABLE->STALE 72853541Sshin * 0 1 n -- (2c) *->REACHABLE 72953541Sshin * 0 1 y n (2b) L *->REACHABLE 73053541Sshin * 0 1 y y (1) REACHABLE->STALE 73153541Sshin * 1 0 n -- (2a) 73253541Sshin * 1 0 y n (2a) L 73353541Sshin * 1 0 y y (2a) L *->STALE 73453541Sshin * 1 1 n -- (2a) *->REACHABLE 73553541Sshin * 1 1 y n (2a) L *->REACHABLE 73653541Sshin * 1 1 y y (2a) L *->REACHABLE 73753541Sshin */ 738151539Ssuz if (!is_override && (lladdr != NULL && llchange)) { /* (1) */ 73953541Sshin /* 74053541Sshin * If state is REACHABLE, make it STALE. 74153541Sshin * no other updates should be done. 74253541Sshin */ 74378064Sume if (ln->ln_state == ND6_LLINFO_REACHABLE) { 74453541Sshin ln->ln_state = ND6_LLINFO_STALE; 745151539Ssuz nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 74678064Sume } 74762587Sitojun goto freeit; 74853541Sshin } else if (is_override /* (2a) */ 749151465Ssuz || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */ 750151465Ssuz || lladdr == NULL) { /* (2c) */ 75153541Sshin /* 75253541Sshin * Update link-local address, if any. 75353541Sshin */ 754151465Ssuz if (lladdr != NULL) { 75553541Sshin sdl->sdl_alen = ifp->if_addrlen; 75653541Sshin bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 75753541Sshin } 75853541Sshin 75953541Sshin /* 76053541Sshin * If solicited, make the state REACHABLE. 76153541Sshin * If not solicited and the link-layer address was 76253541Sshin * changed, make it STALE. 76353541Sshin */ 76453541Sshin if (is_solicited) { 76553541Sshin ln->ln_state = ND6_LLINFO_REACHABLE; 76662587Sitojun ln->ln_byhint = 0; 767151539Ssuz if (!ND6_LLINFO_PERMANENT(ln)) { 768151539Ssuz nd6_llinfo_settimer(ln, 769151539Ssuz (long)ND_IFINFO(ifp)->reachable * hz); 77053541Sshin } 77153541Sshin } else { 772151465Ssuz if (lladdr != NULL && llchange) { 77353541Sshin ln->ln_state = ND6_LLINFO_STALE; 774151539Ssuz nd6_llinfo_settimer(ln, 775151539Ssuz (long)nd6_gctimer * hz); 77678064Sume } 77753541Sshin } 77853541Sshin } 77953541Sshin 78053541Sshin if (ln->ln_router && !is_router) { 78153541Sshin /* 78253541Sshin * The peer dropped the router flag. 78353541Sshin * Remove the sender from the Default Router List and 78453541Sshin * update the Destination Cache entries. 78553541Sshin */ 78653541Sshin struct nd_defrouter *dr; 78753541Sshin struct in6_addr *in6; 78853541Sshin int s; 78953541Sshin 79053541Sshin in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr; 79195023Ssuz 79295023Ssuz /* 79395023Ssuz * Lock to protect the default router list. 79495023Ssuz * XXX: this might be unnecessary, since this function 79595023Ssuz * is only called under the network software interrupt 796120941Sume * context. However, we keep it just for safety. 79795023Ssuz */ 79853541Sshin s = splnet(); 799128422Sluigi dr = defrouter_lookup(in6, ifp); 80053541Sshin if (dr) 80153541Sshin defrtrlist_del(dr); 802151539Ssuz else if (!ip6_forwarding) { 80353541Sshin /* 80453541Sshin * Even if the neighbor is not in the default 80553541Sshin * router list, the neighbor may be used 80653541Sshin * as a next hop for some destinations 80753541Sshin * (e.g. redirect case). So we must 80853541Sshin * call rt6_flush explicitly. 80953541Sshin */ 810128422Sluigi rt6_flush(&ip6->ip6_src, ifp); 81153541Sshin } 81253541Sshin splx(s); 81353541Sshin } 81453541Sshin ln->ln_router = is_router; 81553541Sshin } 81653541Sshin rt->rt_flags &= ~RTF_REJECT; 81753541Sshin ln->ln_asked = 0; 81853541Sshin if (ln->ln_hold) { 819151539Ssuz struct mbuf *m_hold, *m_hold_next; 820151539Ssuz 821151539Ssuz for (m_hold = ln->ln_hold; m_hold; m_hold = m_hold_next) { 822151539Ssuz struct mbuf *mpkt = NULL; 823151539Ssuz 824151539Ssuz m_hold_next = m_hold->m_nextpkt; 825151539Ssuz mpkt = m_copym(m_hold, 0, M_COPYALL, M_DONTWAIT); 826151539Ssuz if (mpkt == NULL) { 827151539Ssuz m_freem(m_hold); 828151539Ssuz break; 829151539Ssuz } 830151539Ssuz mpkt->m_nextpkt = NULL; 831151539Ssuz /* 832151539Ssuz * we assume ifp is not a loopback here, so just set 833151539Ssuz * the 2nd argument as the 1st one. 834151539Ssuz */ 835151539Ssuz nd6_output(ifp, ifp, mpkt, 836151539Ssuz (struct sockaddr_in6 *)rt_key(rt), rt); 837151539Ssuz } 838120941Sume ln->ln_hold = NULL; 83953541Sshin } 84062587Sitojun 84162587Sitojun freeit: 84262587Sitojun m_freem(m); 84378064Sume return; 84478064Sume 84578064Sume bad: 84678064Sume icmp6stat.icp6s_badna++; 84778064Sume m_freem(m); 84853541Sshin} 84953541Sshin 85053541Sshin/* 85153541Sshin * Neighbor advertisement output handling. 85253541Sshin * 85353541Sshin * Based on RFC 2461 85453541Sshin * 85562587Sitojun * the following items are not implemented yet: 85662587Sitojun * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 85762587Sitojun * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 85853541Sshin */ 85953541Sshinvoid 860148385Sumend6_na_output(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0) 86153541Sshin struct ifnet *ifp; 862148385Sume const struct in6_addr *daddr6_0, *taddr6; 86353541Sshin u_long flags; 86462587Sitojun int tlladdr; /* 1 if include target link-layer address */ 86562587Sitojun struct sockaddr *sdl0; /* sockaddr_dl (= proxy NA) or NULL */ 86653541Sshin{ 86753541Sshin struct mbuf *m; 86853541Sshin struct ip6_hdr *ip6; 86953541Sshin struct nd_neighbor_advert *nd_na; 87053541Sshin struct ip6_moptions im6o; 871148385Sume struct in6_addr *src, daddr6; 872148385Sume struct sockaddr_in6 dst_sa; 873148385Sume int icmp6len, maxlen, error; 87492733Speter caddr_t mac = NULL; 875148385Sume struct route_in6 ro; 87662587Sitojun 877148385Sume bzero(&ro, sizeof(ro)); 878148385Sume 879148385Sume daddr6 = *daddr6_0; /* make a local copy for modification */ 880148385Sume 88162587Sitojun /* estimate the size of message */ 88262587Sitojun maxlen = sizeof(*ip6) + sizeof(*nd_na); 88362587Sitojun maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 88462587Sitojun if (max_linkhdr + maxlen >= MCLBYTES) { 88562587Sitojun#ifdef DIAGNOSTIC 88662587Sitojun printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES " 88762587Sitojun "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 88862587Sitojun#endif 88953541Sshin return; 89062587Sitojun } 89153541Sshin 892111119Simp MGETHDR(m, M_DONTWAIT, MT_DATA); 89362587Sitojun if (m && max_linkhdr + maxlen >= MHLEN) { 894111119Simp MCLGET(m, M_DONTWAIT); 89562587Sitojun if ((m->m_flags & M_EXT) == 0) { 89662587Sitojun m_free(m); 89762587Sitojun m = NULL; 89862587Sitojun } 89962587Sitojun } 90062587Sitojun if (m == NULL) 90162587Sitojun return; 90278064Sume m->m_pkthdr.rcvif = NULL; 90362587Sitojun 904148385Sume if (IN6_IS_ADDR_MULTICAST(&daddr6)) { 90553541Sshin m->m_flags |= M_MCAST; 90653541Sshin im6o.im6o_multicast_ifp = ifp; 90753541Sshin im6o.im6o_multicast_hlim = 255; 90853541Sshin im6o.im6o_multicast_loop = 0; 90953541Sshin } 91053541Sshin 91153541Sshin icmp6len = sizeof(*nd_na); 91253541Sshin m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len; 91395023Ssuz m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 91453541Sshin 91553541Sshin /* fill neighbor advertisement packet */ 91653541Sshin ip6 = mtod(m, struct ip6_hdr *); 91753541Sshin ip6->ip6_flow = 0; 91862587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 91962587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 92053541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 92153541Sshin ip6->ip6_hlim = 255; 922148385Sume if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) { 92353541Sshin /* reply to DAD */ 924153227Sume daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 925153227Sume daddr6.s6_addr16[1] = 0; 926153227Sume daddr6.s6_addr32[1] = 0; 927153227Sume daddr6.s6_addr32[2] = 0; 928153227Sume daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE; 929148385Sume if (in6_setscope(&daddr6, ifp, NULL)) 930148385Sume goto bad; 931148385Sume 93253541Sshin flags &= ~ND_NA_FLAG_SOLICITED; 933148385Sume } 934148385Sume ip6->ip6_dst = daddr6; 935148385Sume bzero(&dst_sa, sizeof(struct sockaddr_in6)); 936148385Sume dst_sa.sin6_family = AF_INET6; 937148385Sume dst_sa.sin6_len = sizeof(struct sockaddr_in6); 938148385Sume dst_sa.sin6_addr = daddr6; 93953541Sshin 94053541Sshin /* 94153541Sshin * Select a source whose scope is the same as that of the dest. 94253541Sshin */ 943148385Sume bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa)); 944148385Sume src = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, NULL, &error); 945148385Sume if (src == NULL) { 946165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 947148385Sume nd6log((LOG_DEBUG, "nd6_na_output: source can't be " 948148385Sume "determined: dst=%s, error=%d\n", 949165118Sbz ip6_sprintf(ip6buf, &dst_sa.sin6_addr), error)); 950148385Sume goto bad; 95153541Sshin } 952148385Sume ip6->ip6_src = *src; 95353541Sshin nd_na = (struct nd_neighbor_advert *)(ip6 + 1); 95453541Sshin nd_na->nd_na_type = ND_NEIGHBOR_ADVERT; 95553541Sshin nd_na->nd_na_code = 0; 95653541Sshin nd_na->nd_na_target = *taddr6; 957121315Sume in6_clearscope(&nd_na->nd_na_target); /* XXX */ 95853541Sshin 95953541Sshin /* 96053541Sshin * "tlladdr" indicates NS's condition for adding tlladdr or not. 96153541Sshin * see nd6_ns_input() for details. 96253541Sshin * Basically, if NS packet is sent to unicast/anycast addr, 96353541Sshin * target lladdr option SHOULD NOT be included. 96453541Sshin */ 96562587Sitojun if (tlladdr) { 96662587Sitojun /* 96762587Sitojun * sdl0 != NULL indicates proxy NA. If we do proxy, use 96862587Sitojun * lladdr in sdl0. If we are not proxying (sending NA for 96962587Sitojun * my address) use lladdr configured for the interface. 97062587Sitojun */ 971142215Sglebius if (sdl0 == NULL) { 972142215Sglebius#ifdef DEV_CARP 973142215Sglebius if (ifp->if_carp) 974142215Sglebius mac = carp_macmatch6(ifp->if_carp, m, taddr6); 975142215Sglebius if (mac == NULL) 976142215Sglebius mac = nd6_ifptomac(ifp); 977142215Sglebius#else 97862587Sitojun mac = nd6_ifptomac(ifp); 979142215Sglebius#endif 980142215Sglebius } else if (sdl0->sa_family == AF_LINK) { 98162587Sitojun struct sockaddr_dl *sdl; 98262587Sitojun sdl = (struct sockaddr_dl *)sdl0; 98362587Sitojun if (sdl->sdl_alen == ifp->if_addrlen) 98462587Sitojun mac = LLADDR(sdl); 98562587Sitojun } 98662587Sitojun } 98762587Sitojun if (tlladdr && mac) { 98853541Sshin int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 98953541Sshin struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1); 990120941Sume 99153541Sshin /* roundup to 8 bytes alignment! */ 99253541Sshin optlen = (optlen + 7) & ~7; 99353541Sshin 99453541Sshin m->m_pkthdr.len += optlen; 99553541Sshin m->m_len += optlen; 99653541Sshin icmp6len += optlen; 99753541Sshin bzero((caddr_t)nd_opt, optlen); 99853541Sshin nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 99953541Sshin nd_opt->nd_opt_len = optlen >> 3; 100053541Sshin bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 100153541Sshin } else 100253541Sshin flags &= ~ND_NA_FLAG_OVERRIDE; 100353541Sshin 100453541Sshin ip6->ip6_plen = htons((u_short)icmp6len); 100553541Sshin nd_na->nd_na_flags_reserved = flags; 100653541Sshin nd_na->nd_na_cksum = 0; 100753541Sshin nd_na->nd_na_cksum = 1008120941Sume in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len); 100953541Sshin 1010148385Sume ip6_output(m, NULL, &ro, 0, &im6o, NULL, NULL); 1011148385Sume icmp6_ifstat_inc(ifp, ifs6_out_msg); 1012148385Sume icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert); 1013148385Sume icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++; 1014148385Sume 1015148385Sume if (ro.ro_rt) { /* we don't cache this route. */ 1016148385Sume RTFREE(ro.ro_rt); 101753541Sshin } 1018148385Sume return; 1019148385Sume 1020148385Sume bad: 1021148385Sume if (ro.ro_rt) { 1022148385Sume RTFREE(ro.ro_rt); 1023148385Sume } 1024148385Sume m_freem(m); 1025148385Sume return; 102653541Sshin} 102753541Sshin 102853541Sshincaddr_t 102953541Sshinnd6_ifptomac(ifp) 103053541Sshin struct ifnet *ifp; 103153541Sshin{ 103253541Sshin switch (ifp->if_type) { 103353541Sshin case IFT_ARCNET: 103453541Sshin case IFT_ETHER: 103553541Sshin case IFT_FDDI: 103678064Sume case IFT_IEEE1394: 103778468Ssumikawa#ifdef IFT_L2VLAN 103878468Ssumikawa case IFT_L2VLAN: 103978468Ssumikawa#endif 104078064Sume#ifdef IFT_IEEE80211 104178064Sume case IFT_IEEE80211: 104278064Sume#endif 1043142215Sglebius#ifdef IFT_CARP 1044142215Sglebius case IFT_CARP: 1045142215Sglebius#endif 1046149829Sthompsa case IFT_BRIDGE: 1047120049Smdodd case IFT_ISO88025: 1048147306Sbrooks return IF_LLADDR(ifp); 104953541Sshin default: 105053541Sshin return NULL; 105153541Sshin } 105253541Sshin} 105353541Sshin 105460938SjakeTAILQ_HEAD(dadq_head, dadq); 105553541Sshinstruct dadq { 105660938Sjake TAILQ_ENTRY(dadq) dad_list; 105753541Sshin struct ifaddr *dad_ifa; 105853541Sshin int dad_count; /* max NS to send */ 105962587Sitojun int dad_ns_tcount; /* # of trials to send NS */ 106053541Sshin int dad_ns_ocount; /* NS sent so far */ 106153541Sshin int dad_ns_icount; 106253541Sshin int dad_na_icount; 106378064Sume struct callout dad_timer_ch; 106453541Sshin}; 106553541Sshin 106653541Sshinstatic struct dadq_head dadq; 106778064Sumestatic int dad_init = 0; 106853541Sshin 106953541Sshinstatic struct dadq * 107053541Sshinnd6_dad_find(ifa) 107153541Sshin struct ifaddr *ifa; 107253541Sshin{ 107353541Sshin struct dadq *dp; 107453541Sshin 107562587Sitojun for (dp = dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) { 107653541Sshin if (dp->dad_ifa == ifa) 107753541Sshin return dp; 107853541Sshin } 107953541Sshin return NULL; 108053541Sshin} 108153541Sshin 108278064Sumestatic void 108378064Sumend6_dad_starttimer(dp, ticks) 108478064Sume struct dadq *dp; 108578064Sume int ticks; 108678064Sume{ 108778064Sume 108878064Sume callout_reset(&dp->dad_timer_ch, ticks, 108978064Sume (void (*) __P((void *)))nd6_dad_timer, (void *)dp->dad_ifa); 109078064Sume} 109178064Sume 109278064Sumestatic void 109378064Sumend6_dad_stoptimer(dp) 109478064Sume struct dadq *dp; 109578064Sume{ 109678064Sume 109778064Sume callout_stop(&dp->dad_timer_ch); 109878064Sume} 109978064Sume 110053541Sshin/* 1101148987Sume * Start Duplicate Address Detection (DAD) for specified interface address. 110253541Sshin */ 110353541Sshinvoid 1104151539Ssuznd6_dad_start(ifa, delay) 110553541Sshin struct ifaddr *ifa; 1106151539Ssuz int delay; 110753541Sshin{ 110853541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 110953541Sshin struct dadq *dp; 1110165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 111153541Sshin 111253541Sshin if (!dad_init) { 111353541Sshin TAILQ_INIT(&dadq); 111453541Sshin dad_init++; 111553541Sshin } 111653541Sshin 111753541Sshin /* 111853541Sshin * If we don't need DAD, don't do it. 111953541Sshin * There are several cases: 112053541Sshin * - DAD is disabled (ip6_dad_count == 0) 112153541Sshin * - the interface address is anycast 112253541Sshin */ 112353541Sshin if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) { 112462587Sitojun log(LOG_DEBUG, 112562587Sitojun "nd6_dad_start: called with non-tentative address " 112653541Sshin "%s(%s)\n", 1127165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 112853541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 112953541Sshin return; 113053541Sshin } 113153541Sshin if (ia->ia6_flags & IN6_IFF_ANYCAST) { 113253541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 113353541Sshin return; 113453541Sshin } 113553541Sshin if (!ip6_dad_count) { 113653541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 113753541Sshin return; 113853541Sshin } 1139151465Ssuz if (ifa->ifa_ifp == NULL) 114053541Sshin panic("nd6_dad_start: ifa->ifa_ifp == NULL"); 1141120941Sume if (!(ifa->ifa_ifp->if_flags & IFF_UP)) { 114253541Sshin return; 1143120941Sume } 114453541Sshin if (nd6_dad_find(ifa) != NULL) { 114553541Sshin /* DAD already in progress */ 114653541Sshin return; 114753541Sshin } 114853541Sshin 114953541Sshin dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT); 115053541Sshin if (dp == NULL) { 115162587Sitojun log(LOG_ERR, "nd6_dad_start: memory allocation failed for " 115253541Sshin "%s(%s)\n", 1153165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 115453541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 115553541Sshin return; 115653541Sshin } 115753541Sshin bzero(dp, sizeof(*dp)); 115878064Sume callout_init(&dp->dad_timer_ch, 0); 115953541Sshin TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list); 116053541Sshin 116178064Sume nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp), 1162165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 116353541Sshin 116453541Sshin /* 116553541Sshin * Send NS packet for DAD, ip6_dad_count times. 116653541Sshin * Note that we must delay the first transmission, if this is the 116753541Sshin * first packet to be sent from the interface after interface 116853541Sshin * (re)initialization. 116953541Sshin */ 117053541Sshin dp->dad_ifa = ifa; 117195023Ssuz IFAREF(ifa); /* just for safety */ 117253541Sshin dp->dad_count = ip6_dad_count; 117353541Sshin dp->dad_ns_icount = dp->dad_na_icount = 0; 117462587Sitojun dp->dad_ns_ocount = dp->dad_ns_tcount = 0; 1175151539Ssuz if (delay == 0) { 117662587Sitojun nd6_dad_ns_output(dp, ifa); 1177121161Sume nd6_dad_starttimer(dp, 1178151539Ssuz (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 117953541Sshin } else { 1180151539Ssuz nd6_dad_starttimer(dp, delay); 118153541Sshin } 118253541Sshin} 118353541Sshin 118478064Sume/* 118578064Sume * terminate DAD unconditionally. used for address removals. 118678064Sume */ 118778064Sumevoid 118878064Sumend6_dad_stop(ifa) 118978064Sume struct ifaddr *ifa; 119078064Sume{ 119178064Sume struct dadq *dp; 119278064Sume 119378064Sume if (!dad_init) 119478064Sume return; 119578064Sume dp = nd6_dad_find(ifa); 119678064Sume if (!dp) { 119778064Sume /* DAD wasn't started yet */ 119878064Sume return; 119978064Sume } 120078064Sume 120178064Sume nd6_dad_stoptimer(dp); 120278064Sume 120378064Sume TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 120478064Sume free(dp, M_IP6NDP); 120578064Sume dp = NULL; 120678064Sume IFAFREE(ifa); 120778064Sume} 120878064Sume 120953541Sshinstatic void 121053541Sshinnd6_dad_timer(ifa) 121153541Sshin struct ifaddr *ifa; 121253541Sshin{ 121353541Sshin int s; 121453541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 121553541Sshin struct dadq *dp; 1216165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 121753541Sshin 121895023Ssuz s = splnet(); /* XXX */ 121953541Sshin 122053541Sshin /* Sanity check */ 122153541Sshin if (ia == NULL) { 122262587Sitojun log(LOG_ERR, "nd6_dad_timer: called with null parameter\n"); 122353541Sshin goto done; 122453541Sshin } 122553541Sshin dp = nd6_dad_find(ifa); 122653541Sshin if (dp == NULL) { 122762587Sitojun log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n"); 122853541Sshin goto done; 122953541Sshin } 123053541Sshin if (ia->ia6_flags & IN6_IFF_DUPLICATED) { 123162587Sitojun log(LOG_ERR, "nd6_dad_timer: called with duplicated address " 123253541Sshin "%s(%s)\n", 1233165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 123453541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 123553541Sshin goto done; 123653541Sshin } 123753541Sshin if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) { 123862587Sitojun log(LOG_ERR, "nd6_dad_timer: called with non-tentative address " 123953541Sshin "%s(%s)\n", 1240165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 124153541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 124253541Sshin goto done; 124353541Sshin } 124453541Sshin 124562587Sitojun /* timeouted with IFF_{RUNNING,UP} check */ 124662587Sitojun if (dp->dad_ns_tcount > dad_maxtry) { 124778064Sume nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n", 1248120941Sume if_name(ifa->ifa_ifp))); 124962587Sitojun 125062587Sitojun TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 125162587Sitojun free(dp, M_IP6NDP); 125262587Sitojun dp = NULL; 125362587Sitojun IFAFREE(ifa); 125462587Sitojun goto done; 125562587Sitojun } 125662587Sitojun 125753541Sshin /* Need more checks? */ 125853541Sshin if (dp->dad_ns_ocount < dp->dad_count) { 125953541Sshin /* 126053541Sshin * We have more NS to go. Send NS packet for DAD. 126153541Sshin */ 126262587Sitojun nd6_dad_ns_output(dp, ifa); 1263120941Sume nd6_dad_starttimer(dp, 1264151539Ssuz (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 126553541Sshin } else { 126653541Sshin /* 126753541Sshin * We have transmitted sufficient number of DAD packets. 126853541Sshin * See what we've got. 126953541Sshin */ 127053541Sshin int duplicate; 127153541Sshin 127253541Sshin duplicate = 0; 127353541Sshin 127453541Sshin if (dp->dad_na_icount) { 127553541Sshin /* 127653541Sshin * the check is in nd6_dad_na_input(), 127753541Sshin * but just in case 127853541Sshin */ 127953541Sshin duplicate++; 128053541Sshin } 128153541Sshin 128253541Sshin if (dp->dad_ns_icount) { 128353541Sshin /* We've seen NS, means DAD has failed. */ 128453541Sshin duplicate++; 128553541Sshin } 128653541Sshin 128753541Sshin if (duplicate) { 128853541Sshin /* (*dp) will be freed in nd6_dad_duplicated() */ 128953541Sshin dp = NULL; 129053541Sshin nd6_dad_duplicated(ifa); 129153541Sshin } else { 129253541Sshin /* 129353541Sshin * We are done with DAD. No NA came, no NS came. 1294148987Sume * No duplicate address found. 129553541Sshin */ 129653541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 129753541Sshin 129878064Sume nd6log((LOG_DEBUG, 129962587Sitojun "%s: DAD complete for %s - no duplicates found\n", 130062587Sitojun if_name(ifa->ifa_ifp), 1301165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 130253541Sshin 130353541Sshin TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 130453541Sshin free(dp, M_IP6NDP); 130553541Sshin dp = NULL; 130662587Sitojun IFAFREE(ifa); 130753541Sshin } 130853541Sshin } 130953541Sshin 131053541Sshindone: 131153541Sshin splx(s); 131253541Sshin} 131353541Sshin 131453541Sshinvoid 131553541Sshinnd6_dad_duplicated(ifa) 131653541Sshin struct ifaddr *ifa; 131753541Sshin{ 131853541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1319151477Ssuz struct ifnet *ifp; 132053541Sshin struct dadq *dp; 1321165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 132253541Sshin 132353541Sshin dp = nd6_dad_find(ifa); 132453541Sshin if (dp == NULL) { 132562587Sitojun log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n"); 132653541Sshin return; 132753541Sshin } 132853541Sshin 132978064Sume log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: " 133078064Sume "NS in/out=%d/%d, NA in=%d\n", 1331165118Sbz if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 133278064Sume dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount); 133353541Sshin 133453541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 133553541Sshin ia->ia6_flags |= IN6_IFF_DUPLICATED; 133653541Sshin 1337148987Sume /* We are done with DAD, with duplicate address found. (failure) */ 133878064Sume nd6_dad_stoptimer(dp); 133953541Sshin 1340151477Ssuz ifp = ifa->ifa_ifp; 134162587Sitojun log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n", 1342165118Sbz if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)); 134362587Sitojun log(LOG_ERR, "%s: manual intervention required\n", 1344151477Ssuz if_name(ifp)); 134553541Sshin 1346151477Ssuz /* 1347151477Ssuz * If the address is a link-local address formed from an interface 1348151477Ssuz * identifier based on the hardware address which is supposed to be 1349151477Ssuz * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP 1350151477Ssuz * operation on the interface SHOULD be disabled. 1351151477Ssuz * [rfc2462bis-03 Section 5.4.5] 1352151477Ssuz */ 1353151477Ssuz if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) { 1354151477Ssuz struct in6_addr in6; 1355151477Ssuz 1356151477Ssuz /* 1357151477Ssuz * To avoid over-reaction, we only apply this logic when we are 1358151477Ssuz * very sure that hardware addresses are supposed to be unique. 1359151477Ssuz */ 1360151477Ssuz switch (ifp->if_type) { 1361151477Ssuz case IFT_ETHER: 1362151477Ssuz case IFT_FDDI: 1363151477Ssuz case IFT_ATM: 1364151477Ssuz case IFT_IEEE1394: 1365151477Ssuz#ifdef IFT_IEEE80211 1366151477Ssuz case IFT_IEEE80211: 1367151477Ssuz#endif 1368151477Ssuz in6 = ia->ia_addr.sin6_addr; 1369151477Ssuz if (in6_get_hw_ifid(ifp, &in6) == 0 && 1370151477Ssuz IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) { 1371151477Ssuz ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED; 1372151477Ssuz log(LOG_ERR, "%s: possible hardware address " 1373151477Ssuz "duplication detected, disable IPv6\n", 1374151477Ssuz if_name(ifp)); 1375151477Ssuz } 1376151477Ssuz break; 1377151477Ssuz } 1378151477Ssuz } 1379151477Ssuz 138053541Sshin TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 138153541Sshin free(dp, M_IP6NDP); 138253541Sshin dp = NULL; 138362587Sitojun IFAFREE(ifa); 138453541Sshin} 138553541Sshin 138662587Sitojunstatic void 138762587Sitojunnd6_dad_ns_output(dp, ifa) 138862587Sitojun struct dadq *dp; 138962587Sitojun struct ifaddr *ifa; 139062587Sitojun{ 139162587Sitojun struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 139262587Sitojun struct ifnet *ifp = ifa->ifa_ifp; 139362587Sitojun 139462587Sitojun dp->dad_ns_tcount++; 139562587Sitojun if ((ifp->if_flags & IFF_UP) == 0) { 139662587Sitojun return; 139762587Sitojun } 1398148887Srwatson if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 139962587Sitojun return; 140062587Sitojun } 140162587Sitojun 140262587Sitojun dp->dad_ns_ocount++; 140362587Sitojun nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1); 140462587Sitojun} 140562587Sitojun 140662587Sitojunstatic void 140753541Sshinnd6_dad_ns_input(ifa) 140853541Sshin struct ifaddr *ifa; 140953541Sshin{ 141053541Sshin struct in6_ifaddr *ia; 141153541Sshin struct ifnet *ifp; 141278064Sume const struct in6_addr *taddr6; 141353541Sshin struct dadq *dp; 141453541Sshin int duplicate; 141553541Sshin 1416151465Ssuz if (ifa == NULL) 141753541Sshin panic("ifa == NULL in nd6_dad_ns_input"); 141853541Sshin 141953541Sshin ia = (struct in6_ifaddr *)ifa; 142053541Sshin ifp = ifa->ifa_ifp; 142153541Sshin taddr6 = &ia->ia_addr.sin6_addr; 142253541Sshin duplicate = 0; 142353541Sshin dp = nd6_dad_find(ifa); 142453541Sshin 142553541Sshin /* Quickhack - completely ignore DAD NS packets */ 142653541Sshin if (dad_ignore_ns) { 1427165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 142878064Sume nd6log((LOG_INFO, 142978064Sume "nd6_dad_ns_input: ignoring DAD NS packet for " 1430165118Sbz "address %s(%s)\n", ip6_sprintf(ip6buf, taddr6), 143178064Sume if_name(ifa->ifa_ifp))); 143253541Sshin return; 143353541Sshin } 143453541Sshin 143553541Sshin /* 143653541Sshin * if I'm yet to start DAD, someone else started using this address 143753541Sshin * first. I have a duplicate and you win. 143853541Sshin */ 1439151465Ssuz if (dp == NULL || dp->dad_ns_ocount == 0) 144053541Sshin duplicate++; 144153541Sshin 144253541Sshin /* XXX more checks for loopback situation - see nd6_dad_timer too */ 144353541Sshin 144453541Sshin if (duplicate) { 144553541Sshin dp = NULL; /* will be freed in nd6_dad_duplicated() */ 144653541Sshin nd6_dad_duplicated(ifa); 144753541Sshin } else { 144853541Sshin /* 144953541Sshin * not sure if I got a duplicate. 145053541Sshin * increment ns count and see what happens. 145153541Sshin */ 145253541Sshin if (dp) 145353541Sshin dp->dad_ns_icount++; 145453541Sshin } 145553541Sshin} 145653541Sshin 145762587Sitojunstatic void 145853541Sshinnd6_dad_na_input(ifa) 145953541Sshin struct ifaddr *ifa; 146053541Sshin{ 146153541Sshin struct dadq *dp; 146253541Sshin 1463151465Ssuz if (ifa == NULL) 146453541Sshin panic("ifa == NULL in nd6_dad_na_input"); 146553541Sshin 146653541Sshin dp = nd6_dad_find(ifa); 146753541Sshin if (dp) 146853541Sshin dp->dad_na_icount++; 146953541Sshin 147053541Sshin /* remove the address. */ 147153541Sshin nd6_dad_duplicated(ifa); 147253541Sshin} 1473