nd6_nbr.c revision 257985
1139826Simp/*- 253541Sshin * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 353541Sshin * All rights reserved. 453541Sshin * 553541Sshin * Redistribution and use in source and binary forms, with or without 653541Sshin * modification, are permitted provided that the following conditions 753541Sshin * are met: 853541Sshin * 1. Redistributions of source code must retain the above copyright 953541Sshin * notice, this list of conditions and the following disclaimer. 1053541Sshin * 2. Redistributions in binary form must reproduce the above copyright 1153541Sshin * notice, this list of conditions and the following disclaimer in the 1253541Sshin * documentation and/or other materials provided with the distribution. 1353541Sshin * 3. Neither the name of the project nor the names of its contributors 1453541Sshin * may be used to endorse or promote products derived from this software 1553541Sshin * without specific prior written permission. 1653541Sshin * 1753541Sshin * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 1853541Sshin * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1953541Sshin * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2053541Sshin * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2153541Sshin * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2253541Sshin * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2353541Sshin * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2453541Sshin * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2553541Sshin * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2653541Sshin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2753541Sshin * SUCH DAMAGE. 28174510Sobrien * 29174510Sobrien * $KAME: nd6_nbr.c,v 1.86 2002/01/21 02:33:04 jinmei Exp $ 3053541Sshin */ 3153541Sshin 32174510Sobrien#include <sys/cdefs.h> 33174510Sobrien__FBSDID("$FreeBSD: head/sys/netinet6/nd6_nbr.c 257985 2013-11-11 12:49:00Z ae $"); 34174510Sobrien 3562587Sitojun#include "opt_inet.h" 3662587Sitojun#include "opt_inet6.h" 37142215Sglebius#include "opt_ipsec.h" 38178167Sqingli#include "opt_mpath.h" 3955009Sshin 4053541Sshin#include <sys/param.h> 4153541Sshin#include <sys/systm.h> 4253541Sshin#include <sys/malloc.h> 43186119Sqingli#include <sys/lock.h> 44186119Sqingli#include <sys/rwlock.h> 4553541Sshin#include <sys/mbuf.h> 4653541Sshin#include <sys/socket.h> 4753541Sshin#include <sys/sockio.h> 4853541Sshin#include <sys/time.h> 4953541Sshin#include <sys/kernel.h> 5053541Sshin#include <sys/errno.h> 5153541Sshin#include <sys/syslog.h> 5253541Sshin#include <sys/queue.h> 5378064Sume#include <sys/callout.h> 5453541Sshin 5553541Sshin#include <net/if.h> 5653541Sshin#include <net/if_types.h> 5753541Sshin#include <net/if_dl.h> 58147306Sbrooks#include <net/if_var.h> 5953541Sshin#include <net/route.h> 60178167Sqingli#ifdef RADIX_MPATH 61178167Sqingli#include <net/radix_mpath.h> 62178167Sqingli#endif 6353541Sshin 6453541Sshin#include <netinet/in.h> 6553541Sshin#include <netinet/in_var.h> 66186119Sqingli#include <net/if_llatbl.h> 67186119Sqingli#define L3_ADDR_SIN6(le) ((struct sockaddr_in6 *) L3_ADDR(le)) 6853541Sshin#include <netinet6/in6_var.h> 69151477Ssuz#include <netinet6/in6_ifattach.h> 7062587Sitojun#include <netinet/ip6.h> 7153541Sshin#include <netinet6/ip6_var.h> 72148385Sume#include <netinet6/scope6_var.h> 7353541Sshin#include <netinet6/nd6.h> 7462587Sitojun#include <netinet/icmp6.h> 75211193Swill#include <netinet/ip_carp.h> 76211501Sanchie#include <netinet6/send.h> 7753541Sshin 7862587Sitojun#define SDL(s) ((struct sockaddr_dl *)s) 7953541Sshin 8062587Sitojunstruct dadq; 81175162Sobrienstatic struct dadq *nd6_dad_find(struct ifaddr *); 82175162Sobrienstatic void nd6_dad_starttimer(struct dadq *, int); 83175162Sobrienstatic void nd6_dad_stoptimer(struct dadq *); 84191816Szecstatic void nd6_dad_timer(struct dadq *); 85175162Sobrienstatic void nd6_dad_ns_output(struct dadq *, struct ifaddr *); 86175162Sobrienstatic void nd6_dad_ns_input(struct ifaddr *); 87175162Sobrienstatic void nd6_dad_na_input(struct ifaddr *); 88231852Sbzstatic void nd6_na_output_fib(struct ifnet *, const struct in6_addr *, 89231852Sbz const struct in6_addr *, u_long, int, struct sockaddr *, u_int); 9053541Sshin 91207369SbzVNET_DEFINE(int, dad_ignore_ns) = 0; /* ignore NS in DAD - specwise incorrect*/ 92207369SbzVNET_DEFINE(int, dad_maxtry) = 15; /* max # of *tries* to transmit DAD packet */ 93195727Srwatson#define V_dad_ignore_ns VNET(dad_ignore_ns) 94195727Srwatson#define V_dad_maxtry VNET(dad_maxtry) 95195699Srwatson 9653541Sshin/* 97108470Sschweikh * Input a Neighbor Solicitation Message. 9853541Sshin * 9953541Sshin * Based on RFC 2461 100148987Sume * Based on RFC 2462 (duplicate address detection) 10153541Sshin */ 10253541Sshinvoid 103171259Sdelphijnd6_ns_input(struct mbuf *m, int off, int icmp6len) 10453541Sshin{ 10553541Sshin struct ifnet *ifp = m->m_pkthdr.rcvif; 10653541Sshin struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 10762587Sitojun struct nd_neighbor_solicit *nd_ns; 10853541Sshin struct in6_addr saddr6 = ip6->ip6_src; 10953541Sshin struct in6_addr daddr6 = ip6->ip6_dst; 11062587Sitojun struct in6_addr taddr6; 11153541Sshin struct in6_addr myaddr6; 11253541Sshin char *lladdr = NULL; 113142215Sglebius struct ifaddr *ifa = NULL; 11453541Sshin int lladdrlen = 0; 11553541Sshin int anycast = 0, proxy = 0, tentative = 0; 11653541Sshin int tlladdr; 117222728Shrs int rflag; 11853541Sshin union nd_opts ndopts; 119219562Sbz struct sockaddr_dl proxydl; 120165118Sbz char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 12153541Sshin 122222728Shrs rflag = (V_ip6_forwarding) ? ND_NA_FLAG_ROUTER : 0; 123222728Shrs if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV && V_ip6_norbit_raif) 124222728Shrs rflag = 0; 12578064Sume#ifndef PULLDOWN_TEST 12678064Sume IP6_EXTHDR_CHECK(m, off, icmp6len,); 12778064Sume nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off); 12878064Sume#else 12978064Sume IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len); 13078064Sume if (nd_ns == NULL) { 131190964Srwatson ICMP6STAT_INC(icp6s_tooshort); 13278064Sume return; 13378064Sume } 13478064Sume#endif 13578064Sume ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */ 13678064Sume taddr6 = nd_ns->nd_ns_target; 137148385Sume if (in6_setscope(&taddr6, ifp, NULL) != 0) 138148385Sume goto bad; 13978064Sume 14053541Sshin if (ip6->ip6_hlim != 255) { 14178064Sume nd6log((LOG_ERR, 14278064Sume "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n", 143165118Sbz ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 144165118Sbz ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 14578064Sume goto bad; 14653541Sshin } 14753541Sshin 14853541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 149148987Sume /* dst has to be a solicited node multicast address. */ 150120941Sume if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL && 15195023Ssuz /* don't check ifindex portion */ 152120941Sume daddr6.s6_addr32[1] == 0 && 153120941Sume daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE && 154120941Sume daddr6.s6_addr8[12] == 0xff) { 15595023Ssuz ; /* good */ 15653541Sshin } else { 15778064Sume nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 158120941Sume "(wrong ip6 dst)\n")); 15953541Sshin goto bad; 16053541Sshin } 161185348Szec } else if (!V_nd6_onlink_ns_rfc4861) { 162183529Scperciva struct sockaddr_in6 src_sa6; 163183529Scperciva 164183529Scperciva /* 165183529Scperciva * According to recent IETF discussions, it is not a good idea 166183529Scperciva * to accept a NS from an address which would not be deemed 167183529Scperciva * to be a neighbor otherwise. This point is expected to be 168183529Scperciva * clarified in future revisions of the specification. 169183529Scperciva */ 170183529Scperciva bzero(&src_sa6, sizeof(src_sa6)); 171183529Scperciva src_sa6.sin6_family = AF_INET6; 172183529Scperciva src_sa6.sin6_len = sizeof(src_sa6); 173183529Scperciva src_sa6.sin6_addr = saddr6; 174186119Sqingli if (nd6_is_addr_neighbor(&src_sa6, ifp) == 0) { 175183529Scperciva nd6log((LOG_INFO, "nd6_ns_input: " 176183529Scperciva "NS packet from non-neighbor\n")); 177183529Scperciva goto bad; 178183529Scperciva } 17953541Sshin } 18053541Sshin 18153541Sshin if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 18278064Sume nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n")); 18353541Sshin goto bad; 18453541Sshin } 18553541Sshin 18653541Sshin icmp6len -= sizeof(*nd_ns); 18753541Sshin nd6_option_init(nd_ns + 1, icmp6len, &ndopts); 18853541Sshin if (nd6_options(&ndopts) < 0) { 18978064Sume nd6log((LOG_INFO, 19078064Sume "nd6_ns_input: invalid ND option, ignored\n")); 19178064Sume /* nd6_options have incremented stats */ 19278064Sume goto freeit; 19353541Sshin } 19453541Sshin 19553541Sshin if (ndopts.nd_opts_src_lladdr) { 19695023Ssuz lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 19753541Sshin lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 19853541Sshin } 199120941Sume 20053541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) { 20178064Sume nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 20278064Sume "(link-layer address option)\n")); 20353541Sshin goto bad; 20453541Sshin } 20553541Sshin 20653541Sshin /* 20753541Sshin * Attaching target link-layer address to the NA? 20853541Sshin * (RFC 2461 7.2.4) 20953541Sshin * 21053541Sshin * NS IP dst is unicast/anycast MUST NOT add 21153541Sshin * NS IP dst is solicited-node multicast MUST add 21253541Sshin * 21353541Sshin * In implementation, we add target link-layer address by default. 21453541Sshin * We do not add one in MUST NOT cases. 21553541Sshin */ 21653541Sshin if (!IN6_IS_ADDR_MULTICAST(&daddr6)) 21753541Sshin tlladdr = 0; 21853541Sshin else 21953541Sshin tlladdr = 1; 22053541Sshin 22153541Sshin /* 22253541Sshin * Target address (taddr6) must be either: 22353541Sshin * (1) Valid unicast/anycast address for my receiving interface, 22453541Sshin * (2) Unicast address for which I'm offering proxy service, or 22553541Sshin * (3) "tentative" address on which DAD is being performed. 22653541Sshin */ 22753541Sshin /* (1) and (3) check. */ 228142215Sglebius if (ifp->if_carp) 229211157Swill ifa = (*carp_iamatch6_p)(ifp, &taddr6); 230228571Sglebius else 231142215Sglebius ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 23253541Sshin 23353541Sshin /* (2) check. */ 234151465Ssuz if (ifa == NULL) { 235257985Sae struct route_in6 ro; 236121765Ssam int need_proxy; 23753541Sshin 238257985Sae bzero(&ro, sizeof(ro)); 239257985Sae ro.ro_dst.sin6_len = sizeof(struct sockaddr_in6); 240257985Sae ro.ro_dst.sin6_family = AF_INET6; 241257985Sae ro.ro_dst.sin6_addr = taddr6; 24253541Sshin 243231852Sbz /* Always use the default FIB. */ 244178167Sqingli#ifdef RADIX_MPATH 245231852Sbz rtalloc_mpath_fib((struct route *)&ro, RTF_ANNOUNCE, 246231852Sbz RT_DEFAULT_FIB); 247178167Sqingli#else 248257985Sae in6_rtalloc(&ro, RT_DEFAULT_FIB); 249178167Sqingli#endif 250257985Sae need_proxy = (ro.ro_rt && 251257985Sae (ro.ro_rt->rt_flags & RTF_ANNOUNCE) != 0 && 252257985Sae ro.ro_rt->rt_gateway->sa_family == AF_LINK); 253257985Sae if (ro.ro_rt != NULL) { 254219562Sbz if (need_proxy) 255257985Sae proxydl = *SDL(ro.ro_rt->rt_gateway); 256257985Sae RTFREE(ro.ro_rt); 257219562Sbz } 258121765Ssam if (need_proxy) { 25953541Sshin /* 26062587Sitojun * proxy NDP for single entry 26153541Sshin */ 26262587Sitojun ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 26362587Sitojun IN6_IFF_NOTREADY|IN6_IFF_ANYCAST); 264219562Sbz if (ifa) 26553541Sshin proxy = 1; 26653541Sshin } 26753541Sshin } 268151479Ssuz if (ifa == NULL) { 26953541Sshin /* 27078064Sume * We've got an NS packet, and we don't have that adddress 27153541Sshin * assigned for us. We MUST silently ignore it. 27253541Sshin * See RFC2461 7.2.3. 27353541Sshin */ 27462587Sitojun goto freeit; 27553541Sshin } 27653541Sshin myaddr6 = *IFA_IN6(ifa); 27753541Sshin anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST; 27853541Sshin tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE; 27953541Sshin if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED) 28062587Sitojun goto freeit; 28153541Sshin 28253541Sshin if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 283120941Sume nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s " 28453541Sshin "(if %d, NS packet %d)\n", 285165118Sbz ip6_sprintf(ip6bufs, &taddr6), 286120941Sume ifp->if_addrlen, lladdrlen - 2)); 28778064Sume goto bad; 28853541Sshin } 28953541Sshin 29053541Sshin if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) { 291120941Sume nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n", 292165118Sbz ip6_sprintf(ip6bufs, &saddr6))); 29362587Sitojun goto freeit; 29453541Sshin } 29553541Sshin 29653541Sshin /* 29753541Sshin * We have neighbor solicitation packet, with target address equals to 29853541Sshin * one of my tentative address. 29953541Sshin * 30053541Sshin * src addr how to process? 30153541Sshin * --- --- 30253541Sshin * multicast of course, invalid (rejected in ip6_input) 30353541Sshin * unicast somebody is doing address resolution -> ignore 30453541Sshin * unspec dup address detection 30553541Sshin * 30653541Sshin * The processing is defined in RFC 2462. 30753541Sshin */ 30853541Sshin if (tentative) { 30953541Sshin /* 31053541Sshin * If source address is unspecified address, it is for 311148987Sume * duplicate address detection. 31253541Sshin * 31353541Sshin * If not, the packet is for addess resolution; 31453541Sshin * silently ignore it. 31553541Sshin */ 31653541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 31753541Sshin nd6_dad_ns_input(ifa); 31853541Sshin 31962587Sitojun goto freeit; 32053541Sshin } 32153541Sshin 32253541Sshin /* 32353541Sshin * If the source address is unspecified address, entries must not 32453541Sshin * be created or updated. 32553541Sshin * It looks that sender is performing DAD. Output NA toward 32653541Sshin * all-node multicast address, to tell the sender that I'm using 32753541Sshin * the address. 32853541Sshin * S bit ("solicited") must be zero. 32953541Sshin */ 33053541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 331148385Sume struct in6_addr in6_all; 332148385Sume 333148385Sume in6_all = in6addr_linklocal_allnodes; 334148385Sume if (in6_setscope(&in6_all, ifp, NULL) != 0) 335148385Sume goto bad; 336231852Sbz nd6_na_output_fib(ifp, &in6_all, &taddr6, 337120941Sume ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 338231852Sbz rflag, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL, 339231852Sbz M_GETFIB(m)); 34062587Sitojun goto freeit; 34153541Sshin } 34253541Sshin 343120941Sume nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, 344120941Sume ND_NEIGHBOR_SOLICIT, 0); 34553541Sshin 346231852Sbz nd6_na_output_fib(ifp, &saddr6, &taddr6, 347120941Sume ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 348222728Shrs rflag | ND_NA_FLAG_SOLICITED, tlladdr, 349231852Sbz proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m)); 35062587Sitojun freeit: 351194760Srwatson if (ifa != NULL) 352194760Srwatson ifa_free(ifa); 35362587Sitojun m_freem(m); 35453541Sshin return; 35553541Sshin 35653541Sshin bad: 357165118Sbz nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", 358165118Sbz ip6_sprintf(ip6bufs, &saddr6))); 359165118Sbz nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", 360165118Sbz ip6_sprintf(ip6bufs, &daddr6))); 361165118Sbz nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", 362165118Sbz ip6_sprintf(ip6bufs, &taddr6))); 363190964Srwatson ICMP6STAT_INC(icp6s_badns); 364194760Srwatson if (ifa != NULL) 365194760Srwatson ifa_free(ifa); 36662587Sitojun m_freem(m); 36753541Sshin} 36853541Sshin 36953541Sshin/* 370108470Sschweikh * Output a Neighbor Solicitation Message. Caller specifies: 37153541Sshin * - ICMP6 header source IP6 address 37253541Sshin * - ND6 header target IP6 address 37353541Sshin * - ND6 header source datalink address 37453541Sshin * 37553541Sshin * Based on RFC 2461 376148987Sume * Based on RFC 2462 (duplicate address detection) 377171259Sdelphij * 378171259Sdelphij * ln - for source address determination 379171259Sdelphij * dad - duplicate address detection 38053541Sshin */ 38153541Sshinvoid 382186119Sqinglind6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6, 383186119Sqingli const struct in6_addr *taddr6, struct llentry *ln, int dad) 38453541Sshin{ 38553541Sshin struct mbuf *m; 386211501Sanchie struct m_tag *mtag; 38753541Sshin struct ip6_hdr *ip6; 38853541Sshin struct nd_neighbor_solicit *nd_ns; 38953541Sshin struct ip6_moptions im6o; 39053541Sshin int icmp6len; 39162587Sitojun int maxlen; 39253541Sshin caddr_t mac; 393148385Sume struct route_in6 ro; 394120941Sume 39553541Sshin if (IN6_IS_ADDR_MULTICAST(taddr6)) 39653541Sshin return; 39753541Sshin 39862587Sitojun /* estimate the size of message */ 39962587Sitojun maxlen = sizeof(*ip6) + sizeof(*nd_ns); 40062587Sitojun maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 40162587Sitojun if (max_linkhdr + maxlen >= MCLBYTES) { 40262587Sitojun#ifdef DIAGNOSTIC 40362587Sitojun printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES " 40462587Sitojun "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 40562587Sitojun#endif 40653541Sshin return; 40762587Sitojun } 40853541Sshin 409248328Sglebius if (max_linkhdr + maxlen > MHLEN) 410248328Sglebius m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 411248328Sglebius else 412248328Sglebius m = m_gethdr(M_NOWAIT, MT_DATA); 41362587Sitojun if (m == NULL) 41462587Sitojun return; 41562587Sitojun 416215559Sbz bzero(&ro, sizeof(ro)); 417215559Sbz 41853541Sshin if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) { 41953541Sshin m->m_flags |= M_MCAST; 42053541Sshin im6o.im6o_multicast_ifp = ifp; 42153541Sshin im6o.im6o_multicast_hlim = 255; 42253541Sshin im6o.im6o_multicast_loop = 0; 42353541Sshin } 42453541Sshin 42553541Sshin icmp6len = sizeof(*nd_ns); 42653541Sshin m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len; 42795023Ssuz m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 42853541Sshin 42953541Sshin /* fill neighbor solicitation packet */ 43053541Sshin ip6 = mtod(m, struct ip6_hdr *); 43153541Sshin ip6->ip6_flow = 0; 43262587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 43362587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 43453541Sshin /* ip6->ip6_plen will be set later */ 43553541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 43653541Sshin ip6->ip6_hlim = 255; 43753541Sshin if (daddr6) 43853541Sshin ip6->ip6_dst = *daddr6; 43953541Sshin else { 44053541Sshin ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 441148385Sume ip6->ip6_dst.s6_addr16[1] = 0; 44253541Sshin ip6->ip6_dst.s6_addr32[1] = 0; 44353541Sshin ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE; 44453541Sshin ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3]; 44553541Sshin ip6->ip6_dst.s6_addr8[12] = 0xff; 446148385Sume if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 447148385Sume goto bad; 44853541Sshin } 44953541Sshin if (!dad) { 450194760Srwatson struct ifaddr *ifa; 451194760Srwatson 45253541Sshin /* 45353541Sshin * RFC2461 7.2.2: 45453541Sshin * "If the source address of the packet prompting the 45553541Sshin * solicitation is the same as one of the addresses assigned 45653541Sshin * to the outgoing interface, that address SHOULD be placed 45753541Sshin * in the IP Source Address of the outgoing solicitation. 45853541Sshin * Otherwise, any one of the addresses assigned to the 45953541Sshin * interface should be used." 46053541Sshin * 46153541Sshin * We use the source address for the prompting packet 46253541Sshin * (saddr6), if: 46353541Sshin * - saddr6 is given from the caller (by giving "ln"), and 46453541Sshin * - saddr6 belongs to the outgoing interface. 465148385Sume * Otherwise, we perform the source address selection as usual. 46653541Sshin */ 467216022Sbz struct in6_addr *hsrc; 46853541Sshin 469216022Sbz hsrc = NULL; 470216022Sbz if (ln != NULL) { 471216022Sbz LLE_RLOCK(ln); 472216022Sbz if (ln->la_hold != NULL) { 473216022Sbz struct ip6_hdr *hip6; /* hold ip6 */ 474216022Sbz 475216022Sbz /* 476216022Sbz * assuming every packet in la_hold has the same IP 477216022Sbz * header 478216022Sbz */ 479216022Sbz hip6 = mtod(ln->la_hold, struct ip6_hdr *); 480216022Sbz /* XXX pullup? */ 481216022Sbz if (sizeof(*hip6) < ln->la_hold->m_len) { 482216022Sbz ip6->ip6_src = hip6->ip6_src; 483216022Sbz hsrc = &hip6->ip6_src; 484216022Sbz } 485216022Sbz } 486216022Sbz LLE_RUNLOCK(ln); 487148385Sume } 488194760Srwatson if (hsrc && (ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, 489194760Srwatson hsrc)) != NULL) { 490216022Sbz /* ip6_src set already. */ 491194760Srwatson ifa_free(ifa); 492194760Srwatson } else { 493148385Sume int error; 494148385Sume struct sockaddr_in6 dst_sa; 495216022Sbz struct in6_addr src_in; 496231852Sbz struct ifnet *oifp; 497148385Sume 498148385Sume bzero(&dst_sa, sizeof(dst_sa)); 499148385Sume dst_sa.sin6_family = AF_INET6; 500148385Sume dst_sa.sin6_len = sizeof(dst_sa); 501148385Sume dst_sa.sin6_addr = ip6->ip6_dst; 502148385Sume 503231852Sbz oifp = ifp; 504194777Sbz error = in6_selectsrc(&dst_sa, NULL, 505231852Sbz NULL, &ro, NULL, &oifp, &src_in); 506194777Sbz if (error) { 507165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 508148385Sume nd6log((LOG_DEBUG, 509148385Sume "nd6_ns_output: source can't be " 510148385Sume "determined: dst=%s, error=%d\n", 511165118Sbz ip6_sprintf(ip6buf, &dst_sa.sin6_addr), 512165118Sbz error)); 513148385Sume goto bad; 51453541Sshin } 515216022Sbz ip6->ip6_src = src_in; 51653541Sshin } 51753541Sshin } else { 51853541Sshin /* 51953541Sshin * Source address for DAD packet must always be IPv6 52053541Sshin * unspecified address. (0::0) 521148385Sume * We actually don't have to 0-clear the address (we did it 522148385Sume * above), but we do so here explicitly to make the intention 523148385Sume * clearer. 52453541Sshin */ 525216022Sbz bzero(&ip6->ip6_src, sizeof(ip6->ip6_src)); 52653541Sshin } 52753541Sshin nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1); 52853541Sshin nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT; 52953541Sshin nd_ns->nd_ns_code = 0; 53053541Sshin nd_ns->nd_ns_reserved = 0; 53153541Sshin nd_ns->nd_ns_target = *taddr6; 532121315Sume in6_clearscope(&nd_ns->nd_ns_target); /* XXX */ 53353541Sshin 53453541Sshin /* 53553541Sshin * Add source link-layer address option. 53653541Sshin * 53753541Sshin * spec implementation 53853541Sshin * --- --- 53953541Sshin * DAD packet MUST NOT do not add the option 54053541Sshin * there's no link layer address: 54153541Sshin * impossible do not add the option 54253541Sshin * there's link layer address: 54353541Sshin * Multicast NS MUST add one add the option 54453541Sshin * Unicast NS SHOULD add one add the option 54553541Sshin */ 54653541Sshin if (!dad && (mac = nd6_ifptomac(ifp))) { 54753541Sshin int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 54853541Sshin struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); 54953541Sshin /* 8 byte alignments... */ 55053541Sshin optlen = (optlen + 7) & ~7; 551120941Sume 55253541Sshin m->m_pkthdr.len += optlen; 55353541Sshin m->m_len += optlen; 55453541Sshin icmp6len += optlen; 55553541Sshin bzero((caddr_t)nd_opt, optlen); 55653541Sshin nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; 55753541Sshin nd_opt->nd_opt_len = optlen >> 3; 55853541Sshin bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 55953541Sshin } 56053541Sshin 56153541Sshin ip6->ip6_plen = htons((u_short)icmp6len); 56253541Sshin nd_ns->nd_ns_cksum = 0; 563120941Sume nd_ns->nd_ns_cksum = 564120941Sume in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len); 56553541Sshin 566211501Sanchie if (send_sendso_input_hook != NULL) { 567211501Sanchie mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, 568211501Sanchie sizeof(unsigned short), M_NOWAIT); 569211501Sanchie if (mtag == NULL) 570211501Sanchie goto bad; 571211501Sanchie *(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type; 572211501Sanchie m_tag_prepend(m, mtag); 573211501Sanchie } 574211501Sanchie 575151536Ssuz ip6_output(m, NULL, &ro, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL, NULL); 576148385Sume icmp6_ifstat_inc(ifp, ifs6_out_msg); 577148385Sume icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit); 578190964Srwatson ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]); 579148385Sume 580238092Sglebius /* We don't cache this route. */ 581238092Sglebius RO_RTFREE(&ro); 582238092Sglebius 583148385Sume return; 584148385Sume 585148385Sume bad: 586148385Sume if (ro.ro_rt) { 587148385Sume RTFREE(ro.ro_rt); 588148385Sume } 589148385Sume m_freem(m); 590148385Sume return; 59153541Sshin} 59253541Sshin 59353541Sshin/* 59453541Sshin * Neighbor advertisement input handling. 59553541Sshin * 59653541Sshin * Based on RFC 2461 597148987Sume * Based on RFC 2462 (duplicate address detection) 59862587Sitojun * 59962587Sitojun * the following items are not implemented yet: 60062587Sitojun * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 60162587Sitojun * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 60253541Sshin */ 60353541Sshinvoid 604171259Sdelphijnd6_na_input(struct mbuf *m, int off, int icmp6len) 60553541Sshin{ 60653541Sshin struct ifnet *ifp = m->m_pkthdr.rcvif; 60753541Sshin struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 60862587Sitojun struct nd_neighbor_advert *nd_na; 60953541Sshin struct in6_addr daddr6 = ip6->ip6_dst; 61062587Sitojun struct in6_addr taddr6; 61162587Sitojun int flags; 61262587Sitojun int is_router; 61362587Sitojun int is_solicited; 61462587Sitojun int is_override; 61553541Sshin char *lladdr = NULL; 61653541Sshin int lladdrlen = 0; 617186468Skmacy int checklink = 0; 61853541Sshin struct ifaddr *ifa; 619186119Sqingli struct llentry *ln = NULL; 62053541Sshin union nd_opts ndopts; 621186119Sqingli struct mbuf *chain = NULL; 622211501Sanchie struct m_tag *mtag; 623186119Sqingli struct sockaddr_in6 sin6; 624165118Sbz char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 62553541Sshin 62653541Sshin if (ip6->ip6_hlim != 255) { 62778064Sume nd6log((LOG_ERR, 62878064Sume "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n", 629165118Sbz ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 630165118Sbz ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 63178064Sume goto bad; 63262587Sitojun } 63362587Sitojun 63462587Sitojun#ifndef PULLDOWN_TEST 63562587Sitojun IP6_EXTHDR_CHECK(m, off, icmp6len,); 63662587Sitojun nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off); 63762587Sitojun#else 63862587Sitojun IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len); 63962587Sitojun if (nd_na == NULL) { 640190964Srwatson ICMP6STAT_INC(icp6s_tooshort); 64153541Sshin return; 64253541Sshin } 64362587Sitojun#endif 644148385Sume 64562587Sitojun flags = nd_na->nd_na_flags_reserved; 64662587Sitojun is_router = ((flags & ND_NA_FLAG_ROUTER) != 0); 64762587Sitojun is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0); 64862587Sitojun is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0); 64953541Sshin 650148385Sume taddr6 = nd_na->nd_na_target; 651148385Sume if (in6_setscope(&taddr6, ifp, NULL)) 652150202Ssuz goto bad; /* XXX: impossible */ 65353541Sshin 65453541Sshin if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 65578064Sume nd6log((LOG_ERR, 65653541Sshin "nd6_na_input: invalid target address %s\n", 657165118Sbz ip6_sprintf(ip6bufs, &taddr6))); 65878064Sume goto bad; 65953541Sshin } 66053541Sshin if (IN6_IS_ADDR_MULTICAST(&daddr6)) 66153541Sshin if (is_solicited) { 66278064Sume nd6log((LOG_ERR, 66378064Sume "nd6_na_input: a solicited adv is multicasted\n")); 66478064Sume goto bad; 66553541Sshin } 66653541Sshin 66753541Sshin icmp6len -= sizeof(*nd_na); 66853541Sshin nd6_option_init(nd_na + 1, icmp6len, &ndopts); 66953541Sshin if (nd6_options(&ndopts) < 0) { 67078064Sume nd6log((LOG_INFO, 67178064Sume "nd6_na_input: invalid ND option, ignored\n")); 67278064Sume /* nd6_options have incremented stats */ 67362587Sitojun goto freeit; 67453541Sshin } 67553541Sshin 67653541Sshin if (ndopts.nd_opts_tgt_lladdr) { 67753541Sshin lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 67853541Sshin lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 67953541Sshin } 68053541Sshin 681228571Sglebius /* 682228571Sglebius * This effectively disables the DAD check on a non-master CARP 683228571Sglebius * address. 684228571Sglebius */ 685228571Sglebius if (ifp->if_carp) 686228571Sglebius ifa = (*carp_iamatch6_p)(ifp, &taddr6); 687228571Sglebius else 688228571Sglebius ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 68953541Sshin 69053541Sshin /* 69153541Sshin * Target address matches one of my interface address. 69253541Sshin * 69353541Sshin * If my address is tentative, this means that there's somebody 69453541Sshin * already using the same address as mine. This indicates DAD failure. 69553541Sshin * This is defined in RFC 2462. 69653541Sshin * 69753541Sshin * Otherwise, process as defined in RFC 2461. 69853541Sshin */ 69953541Sshin if (ifa 70053541Sshin && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) { 701194760Srwatson ifa_free(ifa); 70253541Sshin nd6_dad_na_input(ifa); 70362587Sitojun goto freeit; 70453541Sshin } 70553541Sshin 70695023Ssuz /* Just for safety, maybe unnecessary. */ 70753541Sshin if (ifa) { 708194760Srwatson ifa_free(ifa); 70953541Sshin log(LOG_ERR, 71053541Sshin "nd6_na_input: duplicate IP6 address %s\n", 711165118Sbz ip6_sprintf(ip6bufs, &taddr6)); 71262587Sitojun goto freeit; 71353541Sshin } 71453541Sshin 71553541Sshin if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 716120941Sume nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s " 717165118Sbz "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6), 718120941Sume ifp->if_addrlen, lladdrlen - 2)); 71978064Sume goto bad; 72053541Sshin } 72153541Sshin 72253541Sshin /* 723120941Sume * If no neighbor cache entry is found, NA SHOULD silently be 724120941Sume * discarded. 72553541Sshin */ 726186119Sqingli IF_AFDATA_LOCK(ifp); 727186119Sqingli ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp); 728186119Sqingli IF_AFDATA_UNLOCK(ifp); 729186119Sqingli if (ln == NULL) { 73062587Sitojun goto freeit; 731186119Sqingli } 73253541Sshin 73353541Sshin if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 73453541Sshin /* 73553541Sshin * If the link-layer has address, and no lladdr option came, 73653541Sshin * discard the packet. 73753541Sshin */ 738186119Sqingli if (ifp->if_addrlen && lladdr == NULL) { 73962587Sitojun goto freeit; 740186119Sqingli } 74153541Sshin 74253541Sshin /* 74353541Sshin * Record link-layer address, and update the state. 74453541Sshin */ 745186119Sqingli bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen); 746186119Sqingli ln->la_flags |= LLE_VALID; 747245925Snp EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED); 74853541Sshin if (is_solicited) { 74953541Sshin ln->ln_state = ND6_LLINFO_REACHABLE; 75062587Sitojun ln->ln_byhint = 0; 751151539Ssuz if (!ND6_LLINFO_PERMANENT(ln)) { 752186119Sqingli nd6_llinfo_settimer_locked(ln, 753186119Sqingli (long)ND_IFINFO(ln->lle_tbl->llt_ifp)->reachable * hz); 754120941Sume } 75578064Sume } else { 75653541Sshin ln->ln_state = ND6_LLINFO_STALE; 757186119Sqingli nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz); 75878064Sume } 75978064Sume if ((ln->ln_router = is_router) != 0) { 76078064Sume /* 76178064Sume * This means a router's state has changed from 76278064Sume * non-reachable to probably reachable, and might 76378064Sume * affect the status of associated prefixes.. 76478064Sume */ 765186468Skmacy checklink = 1; 76678064Sume } 76753541Sshin } else { 76853541Sshin int llchange; 76953541Sshin 77053541Sshin /* 77153541Sshin * Check if the link-layer address has changed or not. 77253541Sshin */ 773151465Ssuz if (lladdr == NULL) 77453541Sshin llchange = 0; 77553541Sshin else { 776186119Sqingli if (ln->la_flags & LLE_VALID) { 777186119Sqingli if (bcmp(lladdr, &ln->ll_addr, ifp->if_addrlen)) 77853541Sshin llchange = 1; 77953541Sshin else 78053541Sshin llchange = 0; 78153541Sshin } else 78253541Sshin llchange = 1; 78353541Sshin } 78453541Sshin 78553541Sshin /* 78653541Sshin * This is VERY complex. Look at it with care. 78753541Sshin * 78853541Sshin * override solicit lladdr llchange action 78953541Sshin * (L: record lladdr) 79053541Sshin * 79153541Sshin * 0 0 n -- (2c) 79253541Sshin * 0 0 y n (2b) L 79353541Sshin * 0 0 y y (1) REACHABLE->STALE 79453541Sshin * 0 1 n -- (2c) *->REACHABLE 79553541Sshin * 0 1 y n (2b) L *->REACHABLE 79653541Sshin * 0 1 y y (1) REACHABLE->STALE 79753541Sshin * 1 0 n -- (2a) 79853541Sshin * 1 0 y n (2a) L 79953541Sshin * 1 0 y y (2a) L *->STALE 80053541Sshin * 1 1 n -- (2a) *->REACHABLE 80153541Sshin * 1 1 y n (2a) L *->REACHABLE 80253541Sshin * 1 1 y y (2a) L *->REACHABLE 80353541Sshin */ 804151539Ssuz if (!is_override && (lladdr != NULL && llchange)) { /* (1) */ 80553541Sshin /* 80653541Sshin * If state is REACHABLE, make it STALE. 80753541Sshin * no other updates should be done. 80853541Sshin */ 80978064Sume if (ln->ln_state == ND6_LLINFO_REACHABLE) { 81053541Sshin ln->ln_state = ND6_LLINFO_STALE; 811186119Sqingli nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz); 81278064Sume } 81362587Sitojun goto freeit; 81453541Sshin } else if (is_override /* (2a) */ 815151465Ssuz || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */ 816151465Ssuz || lladdr == NULL) { /* (2c) */ 81753541Sshin /* 81853541Sshin * Update link-local address, if any. 81953541Sshin */ 820151465Ssuz if (lladdr != NULL) { 821186119Sqingli bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen); 822186119Sqingli ln->la_flags |= LLE_VALID; 823245925Snp EVENTHANDLER_INVOKE(lle_event, ln, 824245925Snp LLENTRY_RESOLVED); 82553541Sshin } 82653541Sshin 82753541Sshin /* 82853541Sshin * If solicited, make the state REACHABLE. 82953541Sshin * If not solicited and the link-layer address was 83053541Sshin * changed, make it STALE. 83153541Sshin */ 83253541Sshin if (is_solicited) { 83353541Sshin ln->ln_state = ND6_LLINFO_REACHABLE; 83462587Sitojun ln->ln_byhint = 0; 835151539Ssuz if (!ND6_LLINFO_PERMANENT(ln)) { 836186119Sqingli nd6_llinfo_settimer_locked(ln, 837151539Ssuz (long)ND_IFINFO(ifp)->reachable * hz); 83853541Sshin } 83953541Sshin } else { 840151465Ssuz if (lladdr != NULL && llchange) { 84153541Sshin ln->ln_state = ND6_LLINFO_STALE; 842186119Sqingli nd6_llinfo_settimer_locked(ln, 843181803Sbz (long)V_nd6_gctimer * hz); 84478064Sume } 84553541Sshin } 84653541Sshin } 84753541Sshin 84853541Sshin if (ln->ln_router && !is_router) { 84953541Sshin /* 85053541Sshin * The peer dropped the router flag. 85153541Sshin * Remove the sender from the Default Router List and 85253541Sshin * update the Destination Cache entries. 85353541Sshin */ 85453541Sshin struct nd_defrouter *dr; 85553541Sshin struct in6_addr *in6; 85653541Sshin 857186119Sqingli in6 = &L3_ADDR_SIN6(ln)->sin6_addr; 85895023Ssuz 85995023Ssuz /* 86095023Ssuz * Lock to protect the default router list. 86195023Ssuz * XXX: this might be unnecessary, since this function 86295023Ssuz * is only called under the network software interrupt 863120941Sume * context. However, we keep it just for safety. 86495023Ssuz */ 865186119Sqingli dr = defrouter_lookup(in6, ln->lle_tbl->llt_ifp); 86653541Sshin if (dr) 86753541Sshin defrtrlist_del(dr); 868222728Shrs else if (ND_IFINFO(ln->lle_tbl->llt_ifp)->flags & 869222728Shrs ND6_IFF_ACCEPT_RTADV) { 87053541Sshin /* 87153541Sshin * Even if the neighbor is not in the default 87253541Sshin * router list, the neighbor may be used 87353541Sshin * as a next hop for some destinations 87453541Sshin * (e.g. redirect case). So we must 87553541Sshin * call rt6_flush explicitly. 87653541Sshin */ 877128422Sluigi rt6_flush(&ip6->ip6_src, ifp); 87853541Sshin } 87953541Sshin } 88053541Sshin ln->ln_router = is_router; 88153541Sshin } 882186119Sqingli /* XXX - QL 883186119Sqingli * Does this matter? 884186119Sqingli * rt->rt_flags &= ~RTF_REJECT; 885186119Sqingli */ 886186119Sqingli ln->la_asked = 0; 887186119Sqingli if (ln->la_hold) { 888151539Ssuz struct mbuf *m_hold, *m_hold_next; 889151539Ssuz 890169273Ssuz /* 891186119Sqingli * reset the la_hold in advance, to explicitly 892186119Sqingli * prevent a la_hold lookup in nd6_output() 893169273Ssuz * (wouldn't happen, though...) 894169273Ssuz */ 895186119Sqingli for (m_hold = ln->la_hold, ln->la_hold = NULL; 896169241Ssuz m_hold; m_hold = m_hold_next) { 897151539Ssuz m_hold_next = m_hold->m_nextpkt; 898169241Ssuz m_hold->m_nextpkt = NULL; 899151539Ssuz /* 900151539Ssuz * we assume ifp is not a loopback here, so just set 901151539Ssuz * the 2nd argument as the 1st one. 902151539Ssuz */ 903211501Sanchie 904211501Sanchie if (send_sendso_input_hook != NULL) { 905211501Sanchie mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, 906211501Sanchie sizeof(unsigned short), M_NOWAIT); 907211501Sanchie if (mtag == NULL) 908211501Sanchie goto bad; 909211501Sanchie m_tag_prepend(m, mtag); 910211501Sanchie } 911211501Sanchie 912186119Sqingli nd6_output_lle(ifp, ifp, m_hold, L3_ADDR_SIN6(ln), NULL, ln, &chain); 913151539Ssuz } 91453541Sshin } 915186119Sqingli freeit: 916186160Skmacy if (ln != NULL) { 917186119Sqingli if (chain) 918186119Sqingli memcpy(&sin6, L3_ADDR_SIN6(ln), sizeof(sin6)); 919186119Sqingli LLE_WUNLOCK(ln); 92062587Sitojun 921186119Sqingli if (chain) 922186119Sqingli nd6_output_flush(ifp, ifp, chain, &sin6, NULL); 923186119Sqingli } 924186468Skmacy if (checklink) 925186468Skmacy pfxlist_onlink_check(); 926186468Skmacy 92762587Sitojun m_freem(m); 92878064Sume return; 92978064Sume 93078064Sume bad: 931186160Skmacy if (ln != NULL) 932186119Sqingli LLE_WUNLOCK(ln); 933186119Sqingli 934190964Srwatson ICMP6STAT_INC(icp6s_badna); 93578064Sume m_freem(m); 93653541Sshin} 93753541Sshin 93853541Sshin/* 93953541Sshin * Neighbor advertisement output handling. 94053541Sshin * 94153541Sshin * Based on RFC 2461 94253541Sshin * 94362587Sitojun * the following items are not implemented yet: 94462587Sitojun * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 94562587Sitojun * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 946171259Sdelphij * 947171259Sdelphij * tlladdr - 1 if include target link-layer address 948171259Sdelphij * sdl0 - sockaddr_dl (= proxy NA) or NULL 94953541Sshin */ 950231852Sbzstatic void 951231852Sbznd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0, 952171259Sdelphij const struct in6_addr *taddr6, u_long flags, int tlladdr, 953231852Sbz struct sockaddr *sdl0, u_int fibnum) 95453541Sshin{ 95553541Sshin struct mbuf *m; 956211501Sanchie struct m_tag *mtag; 957231852Sbz struct ifnet *oifp; 95853541Sshin struct ip6_hdr *ip6; 95953541Sshin struct nd_neighbor_advert *nd_na; 96053541Sshin struct ip6_moptions im6o; 961194777Sbz struct in6_addr src, daddr6; 962148385Sume struct sockaddr_in6 dst_sa; 963148385Sume int icmp6len, maxlen, error; 96492733Speter caddr_t mac = NULL; 965148385Sume struct route_in6 ro; 96662587Sitojun 967148385Sume bzero(&ro, sizeof(ro)); 968148385Sume 969148385Sume daddr6 = *daddr6_0; /* make a local copy for modification */ 970148385Sume 97162587Sitojun /* estimate the size of message */ 97262587Sitojun maxlen = sizeof(*ip6) + sizeof(*nd_na); 97362587Sitojun maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 97462587Sitojun if (max_linkhdr + maxlen >= MCLBYTES) { 97562587Sitojun#ifdef DIAGNOSTIC 97662587Sitojun printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES " 97762587Sitojun "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 97862587Sitojun#endif 97953541Sshin return; 98062587Sitojun } 98153541Sshin 982248328Sglebius if (max_linkhdr + maxlen > MHLEN) 983248328Sglebius m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 984248328Sglebius else 985248328Sglebius m = m_gethdr(M_NOWAIT, MT_DATA); 98662587Sitojun if (m == NULL) 98762587Sitojun return; 988231852Sbz M_SETFIB(m, fibnum); 98962587Sitojun 990148385Sume if (IN6_IS_ADDR_MULTICAST(&daddr6)) { 99153541Sshin m->m_flags |= M_MCAST; 99253541Sshin im6o.im6o_multicast_ifp = ifp; 99353541Sshin im6o.im6o_multicast_hlim = 255; 99453541Sshin im6o.im6o_multicast_loop = 0; 99553541Sshin } 99653541Sshin 99753541Sshin icmp6len = sizeof(*nd_na); 99853541Sshin m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len; 99995023Ssuz m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 100053541Sshin 100153541Sshin /* fill neighbor advertisement packet */ 100253541Sshin ip6 = mtod(m, struct ip6_hdr *); 100353541Sshin ip6->ip6_flow = 0; 100462587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 100562587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 100653541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 100753541Sshin ip6->ip6_hlim = 255; 1008148385Sume if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) { 100953541Sshin /* reply to DAD */ 1010153227Sume daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 1011153227Sume daddr6.s6_addr16[1] = 0; 1012153227Sume daddr6.s6_addr32[1] = 0; 1013153227Sume daddr6.s6_addr32[2] = 0; 1014153227Sume daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE; 1015148385Sume if (in6_setscope(&daddr6, ifp, NULL)) 1016148385Sume goto bad; 1017148385Sume 101853541Sshin flags &= ~ND_NA_FLAG_SOLICITED; 1019148385Sume } 1020148385Sume ip6->ip6_dst = daddr6; 1021148385Sume bzero(&dst_sa, sizeof(struct sockaddr_in6)); 1022148385Sume dst_sa.sin6_family = AF_INET6; 1023148385Sume dst_sa.sin6_len = sizeof(struct sockaddr_in6); 1024148385Sume dst_sa.sin6_addr = daddr6; 102553541Sshin 102653541Sshin /* 102753541Sshin * Select a source whose scope is the same as that of the dest. 102853541Sshin */ 1029148385Sume bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa)); 1030231852Sbz oifp = ifp; 1031231852Sbz error = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, &oifp, &src); 1032194777Sbz if (error) { 1033165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 1034148385Sume nd6log((LOG_DEBUG, "nd6_na_output: source can't be " 1035148385Sume "determined: dst=%s, error=%d\n", 1036165118Sbz ip6_sprintf(ip6buf, &dst_sa.sin6_addr), error)); 1037148385Sume goto bad; 103853541Sshin } 1039194777Sbz ip6->ip6_src = src; 104053541Sshin nd_na = (struct nd_neighbor_advert *)(ip6 + 1); 104153541Sshin nd_na->nd_na_type = ND_NEIGHBOR_ADVERT; 104253541Sshin nd_na->nd_na_code = 0; 104353541Sshin nd_na->nd_na_target = *taddr6; 1044121315Sume in6_clearscope(&nd_na->nd_na_target); /* XXX */ 104553541Sshin 104653541Sshin /* 104753541Sshin * "tlladdr" indicates NS's condition for adding tlladdr or not. 104853541Sshin * see nd6_ns_input() for details. 104953541Sshin * Basically, if NS packet is sent to unicast/anycast addr, 105053541Sshin * target lladdr option SHOULD NOT be included. 105153541Sshin */ 105262587Sitojun if (tlladdr) { 105362587Sitojun /* 105462587Sitojun * sdl0 != NULL indicates proxy NA. If we do proxy, use 105562587Sitojun * lladdr in sdl0. If we are not proxying (sending NA for 105662587Sitojun * my address) use lladdr configured for the interface. 105762587Sitojun */ 1058142215Sglebius if (sdl0 == NULL) { 1059142215Sglebius if (ifp->if_carp) 1060211157Swill mac = (*carp_macmatch6_p)(ifp, m, taddr6); 1061142215Sglebius if (mac == NULL) 1062142215Sglebius mac = nd6_ifptomac(ifp); 1063142215Sglebius } else if (sdl0->sa_family == AF_LINK) { 106462587Sitojun struct sockaddr_dl *sdl; 106562587Sitojun sdl = (struct sockaddr_dl *)sdl0; 106662587Sitojun if (sdl->sdl_alen == ifp->if_addrlen) 106762587Sitojun mac = LLADDR(sdl); 106862587Sitojun } 106962587Sitojun } 107062587Sitojun if (tlladdr && mac) { 107153541Sshin int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 107253541Sshin struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1); 1073120941Sume 107453541Sshin /* roundup to 8 bytes alignment! */ 107553541Sshin optlen = (optlen + 7) & ~7; 107653541Sshin 107753541Sshin m->m_pkthdr.len += optlen; 107853541Sshin m->m_len += optlen; 107953541Sshin icmp6len += optlen; 108053541Sshin bzero((caddr_t)nd_opt, optlen); 108153541Sshin nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 108253541Sshin nd_opt->nd_opt_len = optlen >> 3; 108353541Sshin bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 108453541Sshin } else 108553541Sshin flags &= ~ND_NA_FLAG_OVERRIDE; 108653541Sshin 108753541Sshin ip6->ip6_plen = htons((u_short)icmp6len); 108853541Sshin nd_na->nd_na_flags_reserved = flags; 108953541Sshin nd_na->nd_na_cksum = 0; 109053541Sshin nd_na->nd_na_cksum = 1091120941Sume in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len); 109253541Sshin 1093211501Sanchie if (send_sendso_input_hook != NULL) { 1094211501Sanchie mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, 1095211501Sanchie sizeof(unsigned short), M_NOWAIT); 1096211501Sanchie if (mtag == NULL) 1097211501Sanchie goto bad; 1098211501Sanchie *(unsigned short *)(mtag + 1) = nd_na->nd_na_type; 1099211501Sanchie m_tag_prepend(m, mtag); 1100211501Sanchie } 1101211501Sanchie 1102148385Sume ip6_output(m, NULL, &ro, 0, &im6o, NULL, NULL); 1103148385Sume icmp6_ifstat_inc(ifp, ifs6_out_msg); 1104148385Sume icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert); 1105190964Srwatson ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]); 1106148385Sume 1107238092Sglebius /* We don't cache this route. */ 1108238092Sglebius RO_RTFREE(&ro); 1109238092Sglebius 1110148385Sume return; 1111148385Sume 1112148385Sume bad: 1113148385Sume if (ro.ro_rt) { 1114148385Sume RTFREE(ro.ro_rt); 1115148385Sume } 1116148385Sume m_freem(m); 1117148385Sume return; 111853541Sshin} 111953541Sshin 1120231852Sbz#ifndef BURN_BRIDGES 1121231852Sbzvoid 1122231852Sbznd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0, 1123231852Sbz const struct in6_addr *taddr6, u_long flags, int tlladdr, 1124231852Sbz struct sockaddr *sdl0) 1125231852Sbz{ 1126231852Sbz 1127231852Sbz nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0, 1128231852Sbz RT_DEFAULT_FIB); 1129231852Sbz} 1130231852Sbz#endif 1131231852Sbz 113253541Sshincaddr_t 1133171259Sdelphijnd6_ifptomac(struct ifnet *ifp) 113453541Sshin{ 113553541Sshin switch (ifp->if_type) { 113653541Sshin case IFT_ARCNET: 113753541Sshin case IFT_ETHER: 113853541Sshin case IFT_FDDI: 113978064Sume case IFT_IEEE1394: 114078468Ssumikawa#ifdef IFT_L2VLAN 114178468Ssumikawa case IFT_L2VLAN: 114278468Ssumikawa#endif 114378064Sume#ifdef IFT_IEEE80211 114478064Sume case IFT_IEEE80211: 114578064Sume#endif 1146219819Sjeff case IFT_INFINIBAND: 1147149829Sthompsa case IFT_BRIDGE: 1148120049Smdodd case IFT_ISO88025: 1149147306Sbrooks return IF_LLADDR(ifp); 115053541Sshin default: 115153541Sshin return NULL; 115253541Sshin } 115353541Sshin} 115453541Sshin 115553541Sshinstruct dadq { 115660938Sjake TAILQ_ENTRY(dadq) dad_list; 115753541Sshin struct ifaddr *dad_ifa; 115853541Sshin int dad_count; /* max NS to send */ 115962587Sitojun int dad_ns_tcount; /* # of trials to send NS */ 116053541Sshin int dad_ns_ocount; /* NS sent so far */ 116153541Sshin int dad_ns_icount; 116253541Sshin int dad_na_icount; 116378064Sume struct callout dad_timer_ch; 1164191816Szec struct vnet *dad_vnet; 116553541Sshin}; 116653541Sshin 1167215701Sdimstatic VNET_DEFINE(TAILQ_HEAD(, dadq), dadq); 1168207369SbzVNET_DEFINE(int, dad_init) = 0; 1169195727Srwatson#define V_dadq VNET(dadq) 1170195727Srwatson#define V_dad_init VNET(dad_init) 1171195699Srwatson 117253541Sshinstatic struct dadq * 1173171259Sdelphijnd6_dad_find(struct ifaddr *ifa) 117453541Sshin{ 117553541Sshin struct dadq *dp; 117653541Sshin 1177226340Sglebius TAILQ_FOREACH(dp, &V_dadq, dad_list) 117853541Sshin if (dp->dad_ifa == ifa) 1179226340Sglebius return (dp); 1180226340Sglebius 1181226340Sglebius return (NULL); 118253541Sshin} 118353541Sshin 118478064Sumestatic void 1185171259Sdelphijnd6_dad_starttimer(struct dadq *dp, int ticks) 118678064Sume{ 118778064Sume 118878064Sume callout_reset(&dp->dad_timer_ch, ticks, 1189191816Szec (void (*)(void *))nd6_dad_timer, (void *)dp); 119078064Sume} 119178064Sume 119278064Sumestatic void 1193171259Sdelphijnd6_dad_stoptimer(struct dadq *dp) 119478064Sume{ 119578064Sume 119678064Sume callout_stop(&dp->dad_timer_ch); 119778064Sume} 119878064Sume 119953541Sshin/* 1200148987Sume * Start Duplicate Address Detection (DAD) for specified interface address. 120153541Sshin */ 120253541Sshinvoid 1203171259Sdelphijnd6_dad_start(struct ifaddr *ifa, int delay) 120453541Sshin{ 120553541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 120653541Sshin struct dadq *dp; 1207165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 120853541Sshin 1209181803Sbz if (!V_dad_init) { 1210181803Sbz TAILQ_INIT(&V_dadq); 1211181803Sbz V_dad_init++; 121253541Sshin } 121353541Sshin 121453541Sshin /* 121553541Sshin * If we don't need DAD, don't do it. 121653541Sshin * There are several cases: 121753541Sshin * - DAD is disabled (ip6_dad_count == 0) 121853541Sshin * - the interface address is anycast 121953541Sshin */ 122053541Sshin if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) { 122162587Sitojun log(LOG_DEBUG, 122262587Sitojun "nd6_dad_start: called with non-tentative address " 122353541Sshin "%s(%s)\n", 1224165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 122553541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 122653541Sshin return; 122753541Sshin } 122853541Sshin if (ia->ia6_flags & IN6_IFF_ANYCAST) { 122953541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 123053541Sshin return; 123153541Sshin } 1232181803Sbz if (!V_ip6_dad_count) { 123353541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 123453541Sshin return; 123553541Sshin } 1236151465Ssuz if (ifa->ifa_ifp == NULL) 123753541Sshin panic("nd6_dad_start: ifa->ifa_ifp == NULL"); 1238120941Sume if (!(ifa->ifa_ifp->if_flags & IFF_UP)) { 123953541Sshin return; 1240120941Sume } 1241197138Shrs if (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED) 1242197138Shrs return; 124353541Sshin if (nd6_dad_find(ifa) != NULL) { 124453541Sshin /* DAD already in progress */ 124553541Sshin return; 124653541Sshin } 124753541Sshin 124853541Sshin dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT); 124953541Sshin if (dp == NULL) { 125062587Sitojun log(LOG_ERR, "nd6_dad_start: memory allocation failed for " 125153541Sshin "%s(%s)\n", 1252165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 125353541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 125453541Sshin return; 125553541Sshin } 125653541Sshin bzero(dp, sizeof(*dp)); 125778064Sume callout_init(&dp->dad_timer_ch, 0); 1258191816Szec#ifdef VIMAGE 1259191816Szec dp->dad_vnet = curvnet; 1260191816Szec#endif 1261182150Sjulian TAILQ_INSERT_TAIL(&V_dadq, (struct dadq *)dp, dad_list); 126253541Sshin 126378064Sume nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp), 1264165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 126553541Sshin 126653541Sshin /* 126753541Sshin * Send NS packet for DAD, ip6_dad_count times. 126853541Sshin * Note that we must delay the first transmission, if this is the 126953541Sshin * first packet to be sent from the interface after interface 127053541Sshin * (re)initialization. 127153541Sshin */ 127253541Sshin dp->dad_ifa = ifa; 1273194602Srwatson ifa_ref(ifa); /* just for safety */ 1274181803Sbz dp->dad_count = V_ip6_dad_count; 127553541Sshin dp->dad_ns_icount = dp->dad_na_icount = 0; 127662587Sitojun dp->dad_ns_ocount = dp->dad_ns_tcount = 0; 1277151539Ssuz if (delay == 0) { 127862587Sitojun nd6_dad_ns_output(dp, ifa); 1279121161Sume nd6_dad_starttimer(dp, 1280151539Ssuz (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 128153541Sshin } else { 1282151539Ssuz nd6_dad_starttimer(dp, delay); 128353541Sshin } 128453541Sshin} 128553541Sshin 128678064Sume/* 128778064Sume * terminate DAD unconditionally. used for address removals. 128878064Sume */ 128978064Sumevoid 1290171259Sdelphijnd6_dad_stop(struct ifaddr *ifa) 129178064Sume{ 129278064Sume struct dadq *dp; 129378064Sume 1294181803Sbz if (!V_dad_init) 129578064Sume return; 129678064Sume dp = nd6_dad_find(ifa); 129778064Sume if (!dp) { 129878064Sume /* DAD wasn't started yet */ 129978064Sume return; 130078064Sume } 130178064Sume 130278064Sume nd6_dad_stoptimer(dp); 130378064Sume 1304181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 130578064Sume free(dp, M_IP6NDP); 130678064Sume dp = NULL; 1307194602Srwatson ifa_free(ifa); 130878064Sume} 130978064Sume 131053541Sshinstatic void 1311191816Szecnd6_dad_timer(struct dadq *dp) 131253541Sshin{ 1313183550Szec CURVNET_SET(dp->dad_vnet); 1314191816Szec struct ifaddr *ifa = dp->dad_ifa; 131553541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1316165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 131753541Sshin 131853541Sshin /* Sanity check */ 131953541Sshin if (ia == NULL) { 132062587Sitojun log(LOG_ERR, "nd6_dad_timer: called with null parameter\n"); 132153541Sshin goto done; 132253541Sshin } 132353541Sshin if (ia->ia6_flags & IN6_IFF_DUPLICATED) { 132462587Sitojun log(LOG_ERR, "nd6_dad_timer: called with duplicated address " 132553541Sshin "%s(%s)\n", 1326165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 132753541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 132853541Sshin goto done; 132953541Sshin } 133053541Sshin if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) { 133162587Sitojun log(LOG_ERR, "nd6_dad_timer: called with non-tentative address " 133253541Sshin "%s(%s)\n", 1333165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 133453541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 133553541Sshin goto done; 133653541Sshin } 133753541Sshin 133862587Sitojun /* timeouted with IFF_{RUNNING,UP} check */ 1339181803Sbz if (dp->dad_ns_tcount > V_dad_maxtry) { 134078064Sume nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n", 1341120941Sume if_name(ifa->ifa_ifp))); 134262587Sitojun 1343181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 134462587Sitojun free(dp, M_IP6NDP); 134562587Sitojun dp = NULL; 1346194602Srwatson ifa_free(ifa); 134762587Sitojun goto done; 134862587Sitojun } 134962587Sitojun 135053541Sshin /* Need more checks? */ 135153541Sshin if (dp->dad_ns_ocount < dp->dad_count) { 135253541Sshin /* 135353541Sshin * We have more NS to go. Send NS packet for DAD. 135453541Sshin */ 135562587Sitojun nd6_dad_ns_output(dp, ifa); 1356120941Sume nd6_dad_starttimer(dp, 1357151539Ssuz (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 135853541Sshin } else { 135953541Sshin /* 136053541Sshin * We have transmitted sufficient number of DAD packets. 136153541Sshin * See what we've got. 136253541Sshin */ 136353541Sshin int duplicate; 136453541Sshin 136553541Sshin duplicate = 0; 136653541Sshin 136753541Sshin if (dp->dad_na_icount) { 136853541Sshin /* 136953541Sshin * the check is in nd6_dad_na_input(), 137053541Sshin * but just in case 137153541Sshin */ 137253541Sshin duplicate++; 137353541Sshin } 137453541Sshin 137553541Sshin if (dp->dad_ns_icount) { 137653541Sshin /* We've seen NS, means DAD has failed. */ 137753541Sshin duplicate++; 137853541Sshin } 137953541Sshin 138053541Sshin if (duplicate) { 138153541Sshin /* (*dp) will be freed in nd6_dad_duplicated() */ 138253541Sshin dp = NULL; 138353541Sshin nd6_dad_duplicated(ifa); 138453541Sshin } else { 138553541Sshin /* 138653541Sshin * We are done with DAD. No NA came, no NS came. 1387148987Sume * No duplicate address found. 138853541Sshin */ 138953541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 139053541Sshin 139178064Sume nd6log((LOG_DEBUG, 139262587Sitojun "%s: DAD complete for %s - no duplicates found\n", 139362587Sitojun if_name(ifa->ifa_ifp), 1394165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 139553541Sshin 1396181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 139753541Sshin free(dp, M_IP6NDP); 139853541Sshin dp = NULL; 1399194602Srwatson ifa_free(ifa); 140053541Sshin } 140153541Sshin } 140253541Sshin 140353541Sshindone: 1404183550Szec CURVNET_RESTORE(); 140553541Sshin} 140653541Sshin 140753541Sshinvoid 1408171259Sdelphijnd6_dad_duplicated(struct ifaddr *ifa) 140953541Sshin{ 141053541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1411151477Ssuz struct ifnet *ifp; 141253541Sshin struct dadq *dp; 1413165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 141453541Sshin 141553541Sshin dp = nd6_dad_find(ifa); 141653541Sshin if (dp == NULL) { 141762587Sitojun log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n"); 141853541Sshin return; 141953541Sshin } 142053541Sshin 142178064Sume log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: " 142278064Sume "NS in/out=%d/%d, NA in=%d\n", 1423165118Sbz if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 142478064Sume dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount); 142553541Sshin 142653541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 142753541Sshin ia->ia6_flags |= IN6_IFF_DUPLICATED; 142853541Sshin 1429148987Sume /* We are done with DAD, with duplicate address found. (failure) */ 143078064Sume nd6_dad_stoptimer(dp); 143153541Sshin 1432151477Ssuz ifp = ifa->ifa_ifp; 143362587Sitojun log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n", 1434165118Sbz if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)); 143562587Sitojun log(LOG_ERR, "%s: manual intervention required\n", 1436151477Ssuz if_name(ifp)); 143753541Sshin 1438151477Ssuz /* 1439151477Ssuz * If the address is a link-local address formed from an interface 1440151477Ssuz * identifier based on the hardware address which is supposed to be 1441151477Ssuz * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP 1442151477Ssuz * operation on the interface SHOULD be disabled. 1443197138Shrs * [RFC 4862, Section 5.4.5] 1444151477Ssuz */ 1445151477Ssuz if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) { 1446151477Ssuz struct in6_addr in6; 1447151477Ssuz 1448151477Ssuz /* 1449151477Ssuz * To avoid over-reaction, we only apply this logic when we are 1450151477Ssuz * very sure that hardware addresses are supposed to be unique. 1451151477Ssuz */ 1452151477Ssuz switch (ifp->if_type) { 1453151477Ssuz case IFT_ETHER: 1454151477Ssuz case IFT_FDDI: 1455151477Ssuz case IFT_ATM: 1456151477Ssuz case IFT_IEEE1394: 1457151477Ssuz#ifdef IFT_IEEE80211 1458151477Ssuz case IFT_IEEE80211: 1459151477Ssuz#endif 1460219819Sjeff case IFT_INFINIBAND: 1461151477Ssuz in6 = ia->ia_addr.sin6_addr; 1462151477Ssuz if (in6_get_hw_ifid(ifp, &in6) == 0 && 1463151477Ssuz IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) { 1464151477Ssuz ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED; 1465151477Ssuz log(LOG_ERR, "%s: possible hardware address " 1466151477Ssuz "duplication detected, disable IPv6\n", 1467151477Ssuz if_name(ifp)); 1468151477Ssuz } 1469151477Ssuz break; 1470151477Ssuz } 1471151477Ssuz } 1472151477Ssuz 1473181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 147453541Sshin free(dp, M_IP6NDP); 147553541Sshin dp = NULL; 1476194602Srwatson ifa_free(ifa); 147753541Sshin} 147853541Sshin 147962587Sitojunstatic void 1480171259Sdelphijnd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa) 148162587Sitojun{ 148262587Sitojun struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 148362587Sitojun struct ifnet *ifp = ifa->ifa_ifp; 148462587Sitojun 148562587Sitojun dp->dad_ns_tcount++; 148662587Sitojun if ((ifp->if_flags & IFF_UP) == 0) { 148762587Sitojun return; 148862587Sitojun } 1489148887Srwatson if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 149062587Sitojun return; 149162587Sitojun } 149262587Sitojun 149362587Sitojun dp->dad_ns_ocount++; 149462587Sitojun nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1); 149562587Sitojun} 149662587Sitojun 149762587Sitojunstatic void 1498171259Sdelphijnd6_dad_ns_input(struct ifaddr *ifa) 149953541Sshin{ 150053541Sshin struct in6_ifaddr *ia; 150153541Sshin struct ifnet *ifp; 150278064Sume const struct in6_addr *taddr6; 150353541Sshin struct dadq *dp; 150453541Sshin int duplicate; 150553541Sshin 1506151465Ssuz if (ifa == NULL) 150753541Sshin panic("ifa == NULL in nd6_dad_ns_input"); 150853541Sshin 150953541Sshin ia = (struct in6_ifaddr *)ifa; 151053541Sshin ifp = ifa->ifa_ifp; 151153541Sshin taddr6 = &ia->ia_addr.sin6_addr; 151253541Sshin duplicate = 0; 151353541Sshin dp = nd6_dad_find(ifa); 151453541Sshin 151553541Sshin /* Quickhack - completely ignore DAD NS packets */ 1516181803Sbz if (V_dad_ignore_ns) { 1517165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 151878064Sume nd6log((LOG_INFO, 151978064Sume "nd6_dad_ns_input: ignoring DAD NS packet for " 1520165118Sbz "address %s(%s)\n", ip6_sprintf(ip6buf, taddr6), 152178064Sume if_name(ifa->ifa_ifp))); 152253541Sshin return; 152353541Sshin } 152453541Sshin 152553541Sshin /* 152653541Sshin * if I'm yet to start DAD, someone else started using this address 152753541Sshin * first. I have a duplicate and you win. 152853541Sshin */ 1529151465Ssuz if (dp == NULL || dp->dad_ns_ocount == 0) 153053541Sshin duplicate++; 153153541Sshin 153253541Sshin /* XXX more checks for loopback situation - see nd6_dad_timer too */ 153353541Sshin 153453541Sshin if (duplicate) { 153553541Sshin dp = NULL; /* will be freed in nd6_dad_duplicated() */ 153653541Sshin nd6_dad_duplicated(ifa); 153753541Sshin } else { 153853541Sshin /* 153953541Sshin * not sure if I got a duplicate. 154053541Sshin * increment ns count and see what happens. 154153541Sshin */ 154253541Sshin if (dp) 154353541Sshin dp->dad_ns_icount++; 154453541Sshin } 154553541Sshin} 154653541Sshin 154762587Sitojunstatic void 1548171259Sdelphijnd6_dad_na_input(struct ifaddr *ifa) 154953541Sshin{ 155053541Sshin struct dadq *dp; 155153541Sshin 1552151465Ssuz if (ifa == NULL) 155353541Sshin panic("ifa == NULL in nd6_dad_na_input"); 155453541Sshin 155553541Sshin dp = nd6_dad_find(ifa); 155653541Sshin if (dp) 155753541Sshin dp->dad_na_icount++; 155853541Sshin 155953541Sshin /* remove the address. */ 156053541Sshin nd6_dad_duplicated(ifa); 156153541Sshin} 1562