nd6_nbr.c revision 182150
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 182150 2008-08-25 06:09:32Z julian $"); 34174510Sobrien 3562587Sitojun#include "opt_inet.h" 3662587Sitojun#include "opt_inet6.h" 37142215Sglebius#include "opt_ipsec.h" 38142215Sglebius#include "opt_carp.h" 39178167Sqingli#include "opt_mpath.h" 4055009Sshin 4153541Sshin#include <sys/param.h> 4253541Sshin#include <sys/systm.h> 4353541Sshin#include <sys/malloc.h> 4453541Sshin#include <sys/mbuf.h> 4553541Sshin#include <sys/socket.h> 4653541Sshin#include <sys/sockio.h> 4753541Sshin#include <sys/time.h> 4853541Sshin#include <sys/kernel.h> 4953541Sshin#include <sys/errno.h> 5053541Sshin#include <sys/syslog.h> 5153541Sshin#include <sys/queue.h> 5278064Sume#include <sys/callout.h> 53181803Sbz#include <sys/vimage.h> 5453541Sshin 5553541Sshin#include <net/if.h> 5653541Sshin#include <net/if_types.h> 5753541Sshin#include <net/if_dl.h> 58147306Sbrooks#include <net/if_var.h> 5953541Sshin#include <net/route.h> 60178167Sqingli#ifdef RADIX_MPATH 61178167Sqingli#include <net/radix_mpath.h> 62178167Sqingli#endif 6353541Sshin 6453541Sshin#include <netinet/in.h> 6553541Sshin#include <netinet/in_var.h> 6653541Sshin#include <netinet6/in6_var.h> 67151477Ssuz#include <netinet6/in6_ifattach.h> 6862587Sitojun#include <netinet/ip6.h> 6953541Sshin#include <netinet6/ip6_var.h> 70148385Sume#include <netinet6/scope6_var.h> 7153541Sshin#include <netinet6/nd6.h> 7262587Sitojun#include <netinet/icmp6.h> 7353541Sshin 74142215Sglebius#ifdef DEV_CARP 75142215Sglebius#include <netinet/ip_carp.h> 76142215Sglebius#endif 77142215Sglebius 7862587Sitojun#define SDL(s) ((struct sockaddr_dl *)s) 7953541Sshin 8062587Sitojunstruct dadq; 81175162Sobrienstatic struct dadq *nd6_dad_find(struct ifaddr *); 82175162Sobrienstatic void nd6_dad_starttimer(struct dadq *, int); 83175162Sobrienstatic void nd6_dad_stoptimer(struct dadq *); 84175162Sobrienstatic void nd6_dad_timer(struct ifaddr *); 85175162Sobrienstatic void nd6_dad_ns_output(struct dadq *, struct ifaddr *); 86175162Sobrienstatic void nd6_dad_ns_input(struct ifaddr *); 87175162Sobrienstatic void nd6_dad_na_input(struct ifaddr *); 8853541Sshin 8962587Sitojunstatic int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/ 9062587Sitojunstatic int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */ 9153541Sshin 9253541Sshin/* 93108470Sschweikh * Input a Neighbor Solicitation Message. 9453541Sshin * 9553541Sshin * Based on RFC 2461 96148987Sume * Based on RFC 2462 (duplicate address detection) 9753541Sshin */ 9853541Sshinvoid 99171259Sdelphijnd6_ns_input(struct mbuf *m, int off, int icmp6len) 10053541Sshin{ 10153541Sshin struct ifnet *ifp = m->m_pkthdr.rcvif; 10253541Sshin struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 10362587Sitojun struct nd_neighbor_solicit *nd_ns; 10453541Sshin struct in6_addr saddr6 = ip6->ip6_src; 10553541Sshin struct in6_addr daddr6 = ip6->ip6_dst; 10662587Sitojun struct in6_addr taddr6; 10753541Sshin struct in6_addr myaddr6; 10853541Sshin char *lladdr = NULL; 109142215Sglebius struct ifaddr *ifa = NULL; 11053541Sshin int lladdrlen = 0; 11153541Sshin int anycast = 0, proxy = 0, tentative = 0; 11253541Sshin int tlladdr; 11353541Sshin union nd_opts ndopts; 11462587Sitojun struct sockaddr_dl *proxydl = NULL; 115165118Sbz char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 11653541Sshin 11778064Sume#ifndef PULLDOWN_TEST 11878064Sume IP6_EXTHDR_CHECK(m, off, icmp6len,); 11978064Sume nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off); 12078064Sume#else 12178064Sume IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len); 12278064Sume if (nd_ns == NULL) { 123181803Sbz V_icmp6stat.icp6s_tooshort++; 12478064Sume return; 12578064Sume } 12678064Sume#endif 12778064Sume ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */ 12878064Sume taddr6 = nd_ns->nd_ns_target; 129148385Sume if (in6_setscope(&taddr6, ifp, NULL) != 0) 130148385Sume goto bad; 13178064Sume 13253541Sshin if (ip6->ip6_hlim != 255) { 13378064Sume nd6log((LOG_ERR, 13478064Sume "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n", 135165118Sbz ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 136165118Sbz ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 13778064Sume goto bad; 13853541Sshin } 13953541Sshin 14053541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 141148987Sume /* dst has to be a solicited node multicast address. */ 142120941Sume if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL && 14395023Ssuz /* don't check ifindex portion */ 144120941Sume daddr6.s6_addr32[1] == 0 && 145120941Sume daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE && 146120941Sume daddr6.s6_addr8[12] == 0xff) { 14795023Ssuz ; /* good */ 14853541Sshin } else { 14978064Sume nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 150120941Sume "(wrong ip6 dst)\n")); 15153541Sshin goto bad; 15253541Sshin } 15353541Sshin } 15453541Sshin 15553541Sshin if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 15678064Sume nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n")); 15753541Sshin goto bad; 15853541Sshin } 15953541Sshin 16053541Sshin icmp6len -= sizeof(*nd_ns); 16153541Sshin nd6_option_init(nd_ns + 1, icmp6len, &ndopts); 16253541Sshin if (nd6_options(&ndopts) < 0) { 16378064Sume nd6log((LOG_INFO, 16478064Sume "nd6_ns_input: invalid ND option, ignored\n")); 16578064Sume /* nd6_options have incremented stats */ 16678064Sume goto freeit; 16753541Sshin } 16853541Sshin 16953541Sshin if (ndopts.nd_opts_src_lladdr) { 17095023Ssuz lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 17153541Sshin lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 17253541Sshin } 173120941Sume 17453541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) { 17578064Sume nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 17678064Sume "(link-layer address option)\n")); 17753541Sshin goto bad; 17853541Sshin } 17953541Sshin 18053541Sshin /* 18153541Sshin * Attaching target link-layer address to the NA? 18253541Sshin * (RFC 2461 7.2.4) 18353541Sshin * 18453541Sshin * NS IP dst is unicast/anycast MUST NOT add 18553541Sshin * NS IP dst is solicited-node multicast MUST add 18653541Sshin * 18753541Sshin * In implementation, we add target link-layer address by default. 18853541Sshin * We do not add one in MUST NOT cases. 18953541Sshin */ 19053541Sshin if (!IN6_IS_ADDR_MULTICAST(&daddr6)) 19153541Sshin tlladdr = 0; 19253541Sshin else 19353541Sshin tlladdr = 1; 19453541Sshin 19553541Sshin /* 19653541Sshin * Target address (taddr6) must be either: 19753541Sshin * (1) Valid unicast/anycast address for my receiving interface, 19853541Sshin * (2) Unicast address for which I'm offering proxy service, or 19953541Sshin * (3) "tentative" address on which DAD is being performed. 20053541Sshin */ 20153541Sshin /* (1) and (3) check. */ 202142215Sglebius#ifdef DEV_CARP 203142215Sglebius if (ifp->if_carp) 204142215Sglebius ifa = carp_iamatch6(ifp->if_carp, &taddr6); 205151465Ssuz if (ifa == NULL) 206142215Sglebius ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 207142215Sglebius#else 20853541Sshin ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 209142215Sglebius#endif 21053541Sshin 21153541Sshin /* (2) check. */ 212151465Ssuz if (ifa == NULL) { 21353541Sshin struct rtentry *rt; 21453541Sshin struct sockaddr_in6 tsin6; 215121765Ssam int need_proxy; 216178167Sqingli#ifdef RADIX_MPATH 217178167Sqingli struct route_in6 ro; 218178167Sqingli#endif 21953541Sshin 220171260Sdelphij bzero(&tsin6, sizeof tsin6); 22153541Sshin tsin6.sin6_len = sizeof(struct sockaddr_in6); 22253541Sshin tsin6.sin6_family = AF_INET6; 22353541Sshin tsin6.sin6_addr = taddr6; 22453541Sshin 225178167Sqingli#ifdef RADIX_MPATH 226178167Sqingli bzero(&ro, sizeof(ro)); 227178167Sqingli ro.ro_dst = tsin6; 228178167Sqingli rtalloc_mpath((struct route *)&ro, RTF_ANNOUNCE); 229178167Sqingli rt = ro.ro_rt; 230178167Sqingli#else 23153541Sshin rt = rtalloc1((struct sockaddr *)&tsin6, 0, 0); 232178167Sqingli#endif 233121765Ssam need_proxy = (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 && 234121765Ssam rt->rt_gateway->sa_family == AF_LINK); 235121765Ssam if (rt) 236121765Ssam rtfree(rt); 237121765Ssam if (need_proxy) { 23853541Sshin /* 23962587Sitojun * proxy NDP for single entry 24053541Sshin */ 24162587Sitojun ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 24262587Sitojun IN6_IFF_NOTREADY|IN6_IFF_ANYCAST); 24362587Sitojun if (ifa) { 24453541Sshin proxy = 1; 24562587Sitojun proxydl = SDL(rt->rt_gateway); 24662587Sitojun } 24753541Sshin } 24853541Sshin } 249151479Ssuz if (ifa == NULL) { 25053541Sshin /* 25178064Sume * We've got an NS packet, and we don't have that adddress 25253541Sshin * assigned for us. We MUST silently ignore it. 25353541Sshin * See RFC2461 7.2.3. 25453541Sshin */ 25562587Sitojun goto freeit; 25653541Sshin } 25753541Sshin myaddr6 = *IFA_IN6(ifa); 25853541Sshin anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST; 25953541Sshin tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE; 26053541Sshin if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED) 26162587Sitojun goto freeit; 26253541Sshin 26353541Sshin if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 264120941Sume nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s " 26553541Sshin "(if %d, NS packet %d)\n", 266165118Sbz ip6_sprintf(ip6bufs, &taddr6), 267120941Sume ifp->if_addrlen, lladdrlen - 2)); 26878064Sume goto bad; 26953541Sshin } 27053541Sshin 27153541Sshin if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) { 272120941Sume nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n", 273165118Sbz ip6_sprintf(ip6bufs, &saddr6))); 27462587Sitojun goto freeit; 27553541Sshin } 27653541Sshin 27753541Sshin /* 27853541Sshin * We have neighbor solicitation packet, with target address equals to 27953541Sshin * one of my tentative address. 28053541Sshin * 28153541Sshin * src addr how to process? 28253541Sshin * --- --- 28353541Sshin * multicast of course, invalid (rejected in ip6_input) 28453541Sshin * unicast somebody is doing address resolution -> ignore 28553541Sshin * unspec dup address detection 28653541Sshin * 28753541Sshin * The processing is defined in RFC 2462. 28853541Sshin */ 28953541Sshin if (tentative) { 29053541Sshin /* 29153541Sshin * If source address is unspecified address, it is for 292148987Sume * duplicate address detection. 29353541Sshin * 29453541Sshin * If not, the packet is for addess resolution; 29553541Sshin * silently ignore it. 29653541Sshin */ 29753541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 29853541Sshin nd6_dad_ns_input(ifa); 29953541Sshin 30062587Sitojun goto freeit; 30153541Sshin } 30253541Sshin 30353541Sshin /* 30453541Sshin * If the source address is unspecified address, entries must not 30553541Sshin * be created or updated. 30653541Sshin * It looks that sender is performing DAD. Output NA toward 30753541Sshin * all-node multicast address, to tell the sender that I'm using 30853541Sshin * the address. 30953541Sshin * S bit ("solicited") must be zero. 31053541Sshin */ 31153541Sshin if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 312148385Sume struct in6_addr in6_all; 313148385Sume 314148385Sume in6_all = in6addr_linklocal_allnodes; 315148385Sume if (in6_setscope(&in6_all, ifp, NULL) != 0) 316148385Sume goto bad; 317148385Sume nd6_na_output(ifp, &in6_all, &taddr6, 318120941Sume ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 319181803Sbz (V_ip6_forwarding ? ND_NA_FLAG_ROUTER : 0), 320120941Sume tlladdr, (struct sockaddr *)proxydl); 32162587Sitojun goto freeit; 32253541Sshin } 32353541Sshin 324120941Sume nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, 325120941Sume ND_NEIGHBOR_SOLICIT, 0); 32653541Sshin 32753541Sshin nd6_na_output(ifp, &saddr6, &taddr6, 328120941Sume ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 329181803Sbz (V_ip6_forwarding ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED, 330120941Sume tlladdr, (struct sockaddr *)proxydl); 33162587Sitojun freeit: 33262587Sitojun m_freem(m); 33353541Sshin return; 33453541Sshin 33553541Sshin bad: 336165118Sbz nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", 337165118Sbz ip6_sprintf(ip6bufs, &saddr6))); 338165118Sbz nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", 339165118Sbz ip6_sprintf(ip6bufs, &daddr6))); 340165118Sbz nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", 341165118Sbz ip6_sprintf(ip6bufs, &taddr6))); 342181803Sbz V_icmp6stat.icp6s_badns++; 34362587Sitojun m_freem(m); 34453541Sshin} 34553541Sshin 34653541Sshin/* 347108470Sschweikh * Output a Neighbor Solicitation Message. Caller specifies: 34853541Sshin * - ICMP6 header source IP6 address 34953541Sshin * - ND6 header target IP6 address 35053541Sshin * - ND6 header source datalink address 35153541Sshin * 35253541Sshin * Based on RFC 2461 353148987Sume * Based on RFC 2462 (duplicate address detection) 354171259Sdelphij * 355171259Sdelphij * ln - for source address determination 356171259Sdelphij * dad - duplicate address detection 35753541Sshin */ 35853541Sshinvoid 359171259Sdelphijnd6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6, 360171259Sdelphij const struct in6_addr *taddr6, struct llinfo_nd6 *ln, int dad) 36153541Sshin{ 36253541Sshin struct mbuf *m; 36353541Sshin struct ip6_hdr *ip6; 36453541Sshin struct nd_neighbor_solicit *nd_ns; 365148385Sume struct in6_addr *src, src_in; 36653541Sshin struct ip6_moptions im6o; 36753541Sshin int icmp6len; 36862587Sitojun int maxlen; 36953541Sshin caddr_t mac; 370148385Sume struct route_in6 ro; 371120941Sume 372148385Sume bzero(&ro, sizeof(ro)); 373148385Sume 37453541Sshin if (IN6_IS_ADDR_MULTICAST(taddr6)) 37553541Sshin return; 37653541Sshin 37762587Sitojun /* estimate the size of message */ 37862587Sitojun maxlen = sizeof(*ip6) + sizeof(*nd_ns); 37962587Sitojun maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 38062587Sitojun if (max_linkhdr + maxlen >= MCLBYTES) { 38162587Sitojun#ifdef DIAGNOSTIC 38262587Sitojun printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES " 38362587Sitojun "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 38462587Sitojun#endif 38553541Sshin return; 38662587Sitojun } 38753541Sshin 388111119Simp MGETHDR(m, M_DONTWAIT, MT_DATA); 38962587Sitojun if (m && max_linkhdr + maxlen >= MHLEN) { 390111119Simp MCLGET(m, M_DONTWAIT); 39162587Sitojun if ((m->m_flags & M_EXT) == 0) { 39262587Sitojun m_free(m); 39362587Sitojun m = NULL; 39462587Sitojun } 39562587Sitojun } 39662587Sitojun if (m == NULL) 39762587Sitojun return; 39878064Sume m->m_pkthdr.rcvif = NULL; 39962587Sitojun 40053541Sshin if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) { 40153541Sshin m->m_flags |= M_MCAST; 40253541Sshin im6o.im6o_multicast_ifp = ifp; 40353541Sshin im6o.im6o_multicast_hlim = 255; 40453541Sshin im6o.im6o_multicast_loop = 0; 40553541Sshin } 40653541Sshin 40753541Sshin icmp6len = sizeof(*nd_ns); 40853541Sshin m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len; 40995023Ssuz m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 41053541Sshin 41153541Sshin /* fill neighbor solicitation packet */ 41253541Sshin ip6 = mtod(m, struct ip6_hdr *); 41353541Sshin ip6->ip6_flow = 0; 41462587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 41562587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 41653541Sshin /* ip6->ip6_plen will be set later */ 41753541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 41853541Sshin ip6->ip6_hlim = 255; 41953541Sshin if (daddr6) 42053541Sshin ip6->ip6_dst = *daddr6; 42153541Sshin else { 42253541Sshin ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 423148385Sume ip6->ip6_dst.s6_addr16[1] = 0; 42453541Sshin ip6->ip6_dst.s6_addr32[1] = 0; 42553541Sshin ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE; 42653541Sshin ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3]; 42753541Sshin ip6->ip6_dst.s6_addr8[12] = 0xff; 428148385Sume if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 429148385Sume goto bad; 43053541Sshin } 43153541Sshin if (!dad) { 43253541Sshin /* 43353541Sshin * RFC2461 7.2.2: 43453541Sshin * "If the source address of the packet prompting the 43553541Sshin * solicitation is the same as one of the addresses assigned 43653541Sshin * to the outgoing interface, that address SHOULD be placed 43753541Sshin * in the IP Source Address of the outgoing solicitation. 43853541Sshin * Otherwise, any one of the addresses assigned to the 43953541Sshin * interface should be used." 44053541Sshin * 44153541Sshin * We use the source address for the prompting packet 44253541Sshin * (saddr6), if: 44353541Sshin * - saddr6 is given from the caller (by giving "ln"), and 44453541Sshin * - saddr6 belongs to the outgoing interface. 445148385Sume * Otherwise, we perform the source address selection as usual. 44653541Sshin */ 44795023Ssuz struct ip6_hdr *hip6; /* hold ip6 */ 448148385Sume struct in6_addr *hsrc = NULL; 44953541Sshin 45053541Sshin if (ln && ln->ln_hold) { 451148987Sume /* 452148987Sume * assuming every packet in ln_hold has the same IP 453148987Sume * header 454148987Sume */ 45553541Sshin hip6 = mtod(ln->ln_hold, struct ip6_hdr *); 45653541Sshin /* XXX pullup? */ 45753541Sshin if (sizeof(*hip6) < ln->ln_hold->m_len) 458148385Sume hsrc = &hip6->ip6_src; 45953541Sshin else 460148385Sume hsrc = NULL; 461148385Sume } 462148385Sume if (hsrc && in6ifa_ifpwithaddr(ifp, hsrc)) 463148385Sume src = hsrc; 46453541Sshin else { 465148385Sume int error; 466148385Sume struct sockaddr_in6 dst_sa; 467148385Sume 468148385Sume bzero(&dst_sa, sizeof(dst_sa)); 469148385Sume dst_sa.sin6_family = AF_INET6; 470148385Sume dst_sa.sin6_len = sizeof(dst_sa); 471148385Sume dst_sa.sin6_addr = ip6->ip6_dst; 472148385Sume 473148385Sume src = in6_selectsrc(&dst_sa, NULL, 474148385Sume NULL, &ro, NULL, NULL, &error); 475148385Sume if (src == NULL) { 476165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 477148385Sume nd6log((LOG_DEBUG, 478148385Sume "nd6_ns_output: source can't be " 479148385Sume "determined: dst=%s, error=%d\n", 480165118Sbz ip6_sprintf(ip6buf, &dst_sa.sin6_addr), 481165118Sbz error)); 482148385Sume goto bad; 48353541Sshin } 48453541Sshin } 48553541Sshin } else { 48653541Sshin /* 48753541Sshin * Source address for DAD packet must always be IPv6 48853541Sshin * unspecified address. (0::0) 489148385Sume * We actually don't have to 0-clear the address (we did it 490148385Sume * above), but we do so here explicitly to make the intention 491148385Sume * clearer. 49253541Sshin */ 493148385Sume bzero(&src_in, sizeof(src_in)); 494148385Sume src = &src_in; 49553541Sshin } 496148385Sume ip6->ip6_src = *src; 49753541Sshin nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1); 49853541Sshin nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT; 49953541Sshin nd_ns->nd_ns_code = 0; 50053541Sshin nd_ns->nd_ns_reserved = 0; 50153541Sshin nd_ns->nd_ns_target = *taddr6; 502121315Sume in6_clearscope(&nd_ns->nd_ns_target); /* XXX */ 50353541Sshin 50453541Sshin /* 50553541Sshin * Add source link-layer address option. 50653541Sshin * 50753541Sshin * spec implementation 50853541Sshin * --- --- 50953541Sshin * DAD packet MUST NOT do not add the option 51053541Sshin * there's no link layer address: 51153541Sshin * impossible do not add the option 51253541Sshin * there's link layer address: 51353541Sshin * Multicast NS MUST add one add the option 51453541Sshin * Unicast NS SHOULD add one add the option 51553541Sshin */ 51653541Sshin if (!dad && (mac = nd6_ifptomac(ifp))) { 51753541Sshin int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 51853541Sshin struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); 51953541Sshin /* 8 byte alignments... */ 52053541Sshin optlen = (optlen + 7) & ~7; 521120941Sume 52253541Sshin m->m_pkthdr.len += optlen; 52353541Sshin m->m_len += optlen; 52453541Sshin icmp6len += optlen; 52553541Sshin bzero((caddr_t)nd_opt, optlen); 52653541Sshin nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; 52753541Sshin nd_opt->nd_opt_len = optlen >> 3; 52853541Sshin bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 52953541Sshin } 53053541Sshin 53153541Sshin ip6->ip6_plen = htons((u_short)icmp6len); 53253541Sshin nd_ns->nd_ns_cksum = 0; 533120941Sume nd_ns->nd_ns_cksum = 534120941Sume in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len); 53553541Sshin 536151536Ssuz ip6_output(m, NULL, &ro, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL, NULL); 537148385Sume icmp6_ifstat_inc(ifp, ifs6_out_msg); 538148385Sume icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit); 539181803Sbz V_icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++; 540148385Sume 541148385Sume if (ro.ro_rt) { /* we don't cache this route. */ 542148385Sume RTFREE(ro.ro_rt); 54353541Sshin } 544148385Sume return; 545148385Sume 546148385Sume bad: 547148385Sume if (ro.ro_rt) { 548148385Sume RTFREE(ro.ro_rt); 549148385Sume } 550148385Sume m_freem(m); 551148385Sume return; 55253541Sshin} 55353541Sshin 55453541Sshin/* 55553541Sshin * Neighbor advertisement input handling. 55653541Sshin * 55753541Sshin * Based on RFC 2461 558148987Sume * Based on RFC 2462 (duplicate address detection) 55962587Sitojun * 56062587Sitojun * the following items are not implemented yet: 56162587Sitojun * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 56262587Sitojun * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 56353541Sshin */ 56453541Sshinvoid 565171259Sdelphijnd6_na_input(struct mbuf *m, int off, int icmp6len) 56653541Sshin{ 56753541Sshin struct ifnet *ifp = m->m_pkthdr.rcvif; 56853541Sshin struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 56962587Sitojun struct nd_neighbor_advert *nd_na; 57053541Sshin struct in6_addr daddr6 = ip6->ip6_dst; 57162587Sitojun struct in6_addr taddr6; 57262587Sitojun int flags; 57362587Sitojun int is_router; 57462587Sitojun int is_solicited; 57562587Sitojun int is_override; 57653541Sshin char *lladdr = NULL; 57753541Sshin int lladdrlen = 0; 57853541Sshin struct ifaddr *ifa; 57953541Sshin struct llinfo_nd6 *ln; 58053541Sshin struct rtentry *rt; 58153541Sshin struct sockaddr_dl *sdl; 58253541Sshin union nd_opts ndopts; 583165118Sbz char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 58453541Sshin 58553541Sshin if (ip6->ip6_hlim != 255) { 58678064Sume nd6log((LOG_ERR, 58778064Sume "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n", 588165118Sbz ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 589165118Sbz ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 59078064Sume goto bad; 59162587Sitojun } 59262587Sitojun 59362587Sitojun#ifndef PULLDOWN_TEST 59462587Sitojun IP6_EXTHDR_CHECK(m, off, icmp6len,); 59562587Sitojun nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off); 59662587Sitojun#else 59762587Sitojun IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len); 59862587Sitojun if (nd_na == NULL) { 599181803Sbz V_icmp6stat.icp6s_tooshort++; 60053541Sshin return; 60153541Sshin } 60262587Sitojun#endif 603148385Sume 60462587Sitojun flags = nd_na->nd_na_flags_reserved; 60562587Sitojun is_router = ((flags & ND_NA_FLAG_ROUTER) != 0); 60662587Sitojun is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0); 60762587Sitojun is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0); 60853541Sshin 609148385Sume taddr6 = nd_na->nd_na_target; 610148385Sume if (in6_setscope(&taddr6, ifp, NULL)) 611150202Ssuz goto bad; /* XXX: impossible */ 61253541Sshin 61353541Sshin if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 61478064Sume nd6log((LOG_ERR, 61553541Sshin "nd6_na_input: invalid target address %s\n", 616165118Sbz ip6_sprintf(ip6bufs, &taddr6))); 61778064Sume goto bad; 61853541Sshin } 61953541Sshin if (IN6_IS_ADDR_MULTICAST(&daddr6)) 62053541Sshin if (is_solicited) { 62178064Sume nd6log((LOG_ERR, 62278064Sume "nd6_na_input: a solicited adv is multicasted\n")); 62378064Sume goto bad; 62453541Sshin } 62553541Sshin 62653541Sshin icmp6len -= sizeof(*nd_na); 62753541Sshin nd6_option_init(nd_na + 1, icmp6len, &ndopts); 62853541Sshin if (nd6_options(&ndopts) < 0) { 62978064Sume nd6log((LOG_INFO, 63078064Sume "nd6_na_input: invalid ND option, ignored\n")); 63178064Sume /* nd6_options have incremented stats */ 63262587Sitojun goto freeit; 63353541Sshin } 63453541Sshin 63553541Sshin if (ndopts.nd_opts_tgt_lladdr) { 63653541Sshin lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 63753541Sshin lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 63853541Sshin } 63953541Sshin 64053541Sshin ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 64153541Sshin 64253541Sshin /* 64353541Sshin * Target address matches one of my interface address. 64453541Sshin * 64553541Sshin * If my address is tentative, this means that there's somebody 64653541Sshin * already using the same address as mine. This indicates DAD failure. 64753541Sshin * This is defined in RFC 2462. 64853541Sshin * 64953541Sshin * Otherwise, process as defined in RFC 2461. 65053541Sshin */ 65153541Sshin if (ifa 65253541Sshin && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) { 65353541Sshin nd6_dad_na_input(ifa); 65462587Sitojun goto freeit; 65553541Sshin } 65653541Sshin 65795023Ssuz /* Just for safety, maybe unnecessary. */ 65853541Sshin if (ifa) { 65953541Sshin log(LOG_ERR, 66053541Sshin "nd6_na_input: duplicate IP6 address %s\n", 661165118Sbz ip6_sprintf(ip6bufs, &taddr6)); 66262587Sitojun goto freeit; 66353541Sshin } 66453541Sshin 66553541Sshin if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 666120941Sume nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s " 667165118Sbz "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6), 668120941Sume ifp->if_addrlen, lladdrlen - 2)); 66978064Sume goto bad; 67053541Sshin } 67153541Sshin 67253541Sshin /* 673120941Sume * If no neighbor cache entry is found, NA SHOULD silently be 674120941Sume * discarded. 67553541Sshin */ 67653541Sshin rt = nd6_lookup(&taddr6, 0, ifp); 67753541Sshin if ((rt == NULL) || 67853541Sshin ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) || 67953541Sshin ((sdl = SDL(rt->rt_gateway)) == NULL)) 68062587Sitojun goto freeit; 68153541Sshin 68253541Sshin if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 68353541Sshin /* 68453541Sshin * If the link-layer has address, and no lladdr option came, 68553541Sshin * discard the packet. 68653541Sshin */ 687151465Ssuz if (ifp->if_addrlen && lladdr == NULL) 68862587Sitojun goto freeit; 68953541Sshin 69053541Sshin /* 69153541Sshin * Record link-layer address, and update the state. 69253541Sshin */ 69353541Sshin sdl->sdl_alen = ifp->if_addrlen; 69453541Sshin bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 69553541Sshin if (is_solicited) { 69653541Sshin ln->ln_state = ND6_LLINFO_REACHABLE; 69762587Sitojun ln->ln_byhint = 0; 698151539Ssuz if (!ND6_LLINFO_PERMANENT(ln)) { 699151539Ssuz nd6_llinfo_settimer(ln, 700151539Ssuz (long)ND_IFINFO(rt->rt_ifp)->reachable * hz); 701120941Sume } 70278064Sume } else { 70353541Sshin ln->ln_state = ND6_LLINFO_STALE; 704181803Sbz nd6_llinfo_settimer(ln, (long)V_nd6_gctimer * hz); 70578064Sume } 70678064Sume if ((ln->ln_router = is_router) != 0) { 70778064Sume /* 70878064Sume * This means a router's state has changed from 70978064Sume * non-reachable to probably reachable, and might 71078064Sume * affect the status of associated prefixes.. 71178064Sume */ 71278064Sume pfxlist_onlink_check(); 71378064Sume } 71453541Sshin } else { 71553541Sshin int llchange; 71653541Sshin 71753541Sshin /* 71853541Sshin * Check if the link-layer address has changed or not. 71953541Sshin */ 720151465Ssuz if (lladdr == NULL) 72153541Sshin llchange = 0; 72253541Sshin else { 72353541Sshin if (sdl->sdl_alen) { 72453541Sshin if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 72553541Sshin llchange = 1; 72653541Sshin else 72753541Sshin llchange = 0; 72853541Sshin } else 72953541Sshin llchange = 1; 73053541Sshin } 73153541Sshin 73253541Sshin /* 73353541Sshin * This is VERY complex. Look at it with care. 73453541Sshin * 73553541Sshin * override solicit lladdr llchange action 73653541Sshin * (L: record lladdr) 73753541Sshin * 73853541Sshin * 0 0 n -- (2c) 73953541Sshin * 0 0 y n (2b) L 74053541Sshin * 0 0 y y (1) REACHABLE->STALE 74153541Sshin * 0 1 n -- (2c) *->REACHABLE 74253541Sshin * 0 1 y n (2b) L *->REACHABLE 74353541Sshin * 0 1 y y (1) REACHABLE->STALE 74453541Sshin * 1 0 n -- (2a) 74553541Sshin * 1 0 y n (2a) L 74653541Sshin * 1 0 y y (2a) L *->STALE 74753541Sshin * 1 1 n -- (2a) *->REACHABLE 74853541Sshin * 1 1 y n (2a) L *->REACHABLE 74953541Sshin * 1 1 y y (2a) L *->REACHABLE 75053541Sshin */ 751151539Ssuz if (!is_override && (lladdr != NULL && llchange)) { /* (1) */ 75253541Sshin /* 75353541Sshin * If state is REACHABLE, make it STALE. 75453541Sshin * no other updates should be done. 75553541Sshin */ 75678064Sume if (ln->ln_state == ND6_LLINFO_REACHABLE) { 75753541Sshin ln->ln_state = ND6_LLINFO_STALE; 758181803Sbz nd6_llinfo_settimer(ln, (long)V_nd6_gctimer * hz); 75978064Sume } 76062587Sitojun goto freeit; 76153541Sshin } else if (is_override /* (2a) */ 762151465Ssuz || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */ 763151465Ssuz || lladdr == NULL) { /* (2c) */ 76453541Sshin /* 76553541Sshin * Update link-local address, if any. 76653541Sshin */ 767151465Ssuz if (lladdr != NULL) { 76853541Sshin sdl->sdl_alen = ifp->if_addrlen; 76953541Sshin bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 77053541Sshin } 77153541Sshin 77253541Sshin /* 77353541Sshin * If solicited, make the state REACHABLE. 77453541Sshin * If not solicited and the link-layer address was 77553541Sshin * changed, make it STALE. 77653541Sshin */ 77753541Sshin if (is_solicited) { 77853541Sshin ln->ln_state = ND6_LLINFO_REACHABLE; 77962587Sitojun ln->ln_byhint = 0; 780151539Ssuz if (!ND6_LLINFO_PERMANENT(ln)) { 781151539Ssuz nd6_llinfo_settimer(ln, 782151539Ssuz (long)ND_IFINFO(ifp)->reachable * hz); 78353541Sshin } 78453541Sshin } else { 785151465Ssuz if (lladdr != NULL && llchange) { 78653541Sshin ln->ln_state = ND6_LLINFO_STALE; 787151539Ssuz nd6_llinfo_settimer(ln, 788181803Sbz (long)V_nd6_gctimer * hz); 78978064Sume } 79053541Sshin } 79153541Sshin } 79253541Sshin 79353541Sshin if (ln->ln_router && !is_router) { 79453541Sshin /* 79553541Sshin * The peer dropped the router flag. 79653541Sshin * Remove the sender from the Default Router List and 79753541Sshin * update the Destination Cache entries. 79853541Sshin */ 79953541Sshin struct nd_defrouter *dr; 80053541Sshin struct in6_addr *in6; 80153541Sshin int s; 80253541Sshin 80353541Sshin in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr; 80495023Ssuz 80595023Ssuz /* 80695023Ssuz * Lock to protect the default router list. 80795023Ssuz * XXX: this might be unnecessary, since this function 80895023Ssuz * is only called under the network software interrupt 809120941Sume * context. However, we keep it just for safety. 81095023Ssuz */ 81153541Sshin s = splnet(); 812128422Sluigi dr = defrouter_lookup(in6, ifp); 81353541Sshin if (dr) 81453541Sshin defrtrlist_del(dr); 815181803Sbz else if (!V_ip6_forwarding) { 81653541Sshin /* 81753541Sshin * Even if the neighbor is not in the default 81853541Sshin * router list, the neighbor may be used 81953541Sshin * as a next hop for some destinations 82053541Sshin * (e.g. redirect case). So we must 82153541Sshin * call rt6_flush explicitly. 82253541Sshin */ 823128422Sluigi rt6_flush(&ip6->ip6_src, ifp); 82453541Sshin } 82553541Sshin splx(s); 82653541Sshin } 82753541Sshin ln->ln_router = is_router; 82853541Sshin } 82953541Sshin rt->rt_flags &= ~RTF_REJECT; 83053541Sshin ln->ln_asked = 0; 83153541Sshin if (ln->ln_hold) { 832151539Ssuz struct mbuf *m_hold, *m_hold_next; 833151539Ssuz 834169273Ssuz /* 835169273Ssuz * reset the ln_hold in advance, to explicitly 836169273Ssuz * prevent a ln_hold lookup in nd6_output() 837169273Ssuz * (wouldn't happen, though...) 838169273Ssuz */ 839171133Sgnn for (m_hold = ln->ln_hold; 840169241Ssuz m_hold; m_hold = m_hold_next) { 841151539Ssuz m_hold_next = m_hold->m_nextpkt; 842169241Ssuz m_hold->m_nextpkt = NULL; 843151539Ssuz /* 844151539Ssuz * we assume ifp is not a loopback here, so just set 845151539Ssuz * the 2nd argument as the 1st one. 846151539Ssuz */ 847169241Ssuz nd6_output(ifp, ifp, m_hold, 848151539Ssuz (struct sockaddr_in6 *)rt_key(rt), rt); 849151539Ssuz } 850171133Sgnn ln->ln_hold = NULL; 85153541Sshin } 85262587Sitojun 85362587Sitojun freeit: 85462587Sitojun m_freem(m); 85578064Sume return; 85678064Sume 85778064Sume bad: 858181803Sbz V_icmp6stat.icp6s_badna++; 85978064Sume m_freem(m); 86053541Sshin} 86153541Sshin 86253541Sshin/* 86353541Sshin * Neighbor advertisement output handling. 86453541Sshin * 86553541Sshin * Based on RFC 2461 86653541Sshin * 86762587Sitojun * the following items are not implemented yet: 86862587Sitojun * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 86962587Sitojun * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 870171259Sdelphij * 871171259Sdelphij * tlladdr - 1 if include target link-layer address 872171259Sdelphij * sdl0 - sockaddr_dl (= proxy NA) or NULL 87353541Sshin */ 87453541Sshinvoid 875171259Sdelphijnd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0, 876171259Sdelphij const struct in6_addr *taddr6, u_long flags, int tlladdr, 877171259Sdelphij struct sockaddr *sdl0) 87853541Sshin{ 87953541Sshin struct mbuf *m; 88053541Sshin struct ip6_hdr *ip6; 88153541Sshin struct nd_neighbor_advert *nd_na; 88253541Sshin struct ip6_moptions im6o; 883148385Sume struct in6_addr *src, daddr6; 884148385Sume struct sockaddr_in6 dst_sa; 885148385Sume int icmp6len, maxlen, error; 88692733Speter caddr_t mac = NULL; 887148385Sume struct route_in6 ro; 88862587Sitojun 889148385Sume bzero(&ro, sizeof(ro)); 890148385Sume 891148385Sume daddr6 = *daddr6_0; /* make a local copy for modification */ 892148385Sume 89362587Sitojun /* estimate the size of message */ 89462587Sitojun maxlen = sizeof(*ip6) + sizeof(*nd_na); 89562587Sitojun maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 89662587Sitojun if (max_linkhdr + maxlen >= MCLBYTES) { 89762587Sitojun#ifdef DIAGNOSTIC 89862587Sitojun printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES " 89962587Sitojun "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 90062587Sitojun#endif 90153541Sshin return; 90262587Sitojun } 90353541Sshin 904111119Simp MGETHDR(m, M_DONTWAIT, MT_DATA); 90562587Sitojun if (m && max_linkhdr + maxlen >= MHLEN) { 906111119Simp MCLGET(m, M_DONTWAIT); 90762587Sitojun if ((m->m_flags & M_EXT) == 0) { 90862587Sitojun m_free(m); 90962587Sitojun m = NULL; 91062587Sitojun } 91162587Sitojun } 91262587Sitojun if (m == NULL) 91362587Sitojun return; 91478064Sume m->m_pkthdr.rcvif = NULL; 91562587Sitojun 916148385Sume if (IN6_IS_ADDR_MULTICAST(&daddr6)) { 91753541Sshin m->m_flags |= M_MCAST; 91853541Sshin im6o.im6o_multicast_ifp = ifp; 91953541Sshin im6o.im6o_multicast_hlim = 255; 92053541Sshin im6o.im6o_multicast_loop = 0; 92153541Sshin } 92253541Sshin 92353541Sshin icmp6len = sizeof(*nd_na); 92453541Sshin m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len; 92595023Ssuz m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 92653541Sshin 92753541Sshin /* fill neighbor advertisement packet */ 92853541Sshin ip6 = mtod(m, struct ip6_hdr *); 92953541Sshin ip6->ip6_flow = 0; 93062587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 93162587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 93253541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 93353541Sshin ip6->ip6_hlim = 255; 934148385Sume if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) { 93553541Sshin /* reply to DAD */ 936153227Sume daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 937153227Sume daddr6.s6_addr16[1] = 0; 938153227Sume daddr6.s6_addr32[1] = 0; 939153227Sume daddr6.s6_addr32[2] = 0; 940153227Sume daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE; 941148385Sume if (in6_setscope(&daddr6, ifp, NULL)) 942148385Sume goto bad; 943148385Sume 94453541Sshin flags &= ~ND_NA_FLAG_SOLICITED; 945148385Sume } 946148385Sume ip6->ip6_dst = daddr6; 947148385Sume bzero(&dst_sa, sizeof(struct sockaddr_in6)); 948148385Sume dst_sa.sin6_family = AF_INET6; 949148385Sume dst_sa.sin6_len = sizeof(struct sockaddr_in6); 950148385Sume dst_sa.sin6_addr = daddr6; 95153541Sshin 95253541Sshin /* 95353541Sshin * Select a source whose scope is the same as that of the dest. 95453541Sshin */ 955148385Sume bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa)); 956148385Sume src = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, NULL, &error); 957148385Sume if (src == NULL) { 958165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 959148385Sume nd6log((LOG_DEBUG, "nd6_na_output: source can't be " 960148385Sume "determined: dst=%s, error=%d\n", 961165118Sbz ip6_sprintf(ip6buf, &dst_sa.sin6_addr), error)); 962148385Sume goto bad; 96353541Sshin } 964148385Sume ip6->ip6_src = *src; 96553541Sshin nd_na = (struct nd_neighbor_advert *)(ip6 + 1); 96653541Sshin nd_na->nd_na_type = ND_NEIGHBOR_ADVERT; 96753541Sshin nd_na->nd_na_code = 0; 96853541Sshin nd_na->nd_na_target = *taddr6; 969121315Sume in6_clearscope(&nd_na->nd_na_target); /* XXX */ 97053541Sshin 97153541Sshin /* 97253541Sshin * "tlladdr" indicates NS's condition for adding tlladdr or not. 97353541Sshin * see nd6_ns_input() for details. 97453541Sshin * Basically, if NS packet is sent to unicast/anycast addr, 97553541Sshin * target lladdr option SHOULD NOT be included. 97653541Sshin */ 97762587Sitojun if (tlladdr) { 97862587Sitojun /* 97962587Sitojun * sdl0 != NULL indicates proxy NA. If we do proxy, use 98062587Sitojun * lladdr in sdl0. If we are not proxying (sending NA for 98162587Sitojun * my address) use lladdr configured for the interface. 98262587Sitojun */ 983142215Sglebius if (sdl0 == NULL) { 984142215Sglebius#ifdef DEV_CARP 985142215Sglebius if (ifp->if_carp) 986142215Sglebius mac = carp_macmatch6(ifp->if_carp, m, taddr6); 987142215Sglebius if (mac == NULL) 988142215Sglebius mac = nd6_ifptomac(ifp); 989142215Sglebius#else 99062587Sitojun mac = nd6_ifptomac(ifp); 991142215Sglebius#endif 992142215Sglebius } else if (sdl0->sa_family == AF_LINK) { 99362587Sitojun struct sockaddr_dl *sdl; 99462587Sitojun sdl = (struct sockaddr_dl *)sdl0; 99562587Sitojun if (sdl->sdl_alen == ifp->if_addrlen) 99662587Sitojun mac = LLADDR(sdl); 99762587Sitojun } 99862587Sitojun } 99962587Sitojun if (tlladdr && mac) { 100053541Sshin int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 100153541Sshin struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1); 1002120941Sume 100353541Sshin /* roundup to 8 bytes alignment! */ 100453541Sshin optlen = (optlen + 7) & ~7; 100553541Sshin 100653541Sshin m->m_pkthdr.len += optlen; 100753541Sshin m->m_len += optlen; 100853541Sshin icmp6len += optlen; 100953541Sshin bzero((caddr_t)nd_opt, optlen); 101053541Sshin nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 101153541Sshin nd_opt->nd_opt_len = optlen >> 3; 101253541Sshin bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 101353541Sshin } else 101453541Sshin flags &= ~ND_NA_FLAG_OVERRIDE; 101553541Sshin 101653541Sshin ip6->ip6_plen = htons((u_short)icmp6len); 101753541Sshin nd_na->nd_na_flags_reserved = flags; 101853541Sshin nd_na->nd_na_cksum = 0; 101953541Sshin nd_na->nd_na_cksum = 1020120941Sume in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len); 102153541Sshin 1022148385Sume ip6_output(m, NULL, &ro, 0, &im6o, NULL, NULL); 1023148385Sume icmp6_ifstat_inc(ifp, ifs6_out_msg); 1024148385Sume icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert); 1025181803Sbz V_icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++; 1026148385Sume 1027148385Sume if (ro.ro_rt) { /* we don't cache this route. */ 1028148385Sume RTFREE(ro.ro_rt); 102953541Sshin } 1030148385Sume return; 1031148385Sume 1032148385Sume bad: 1033148385Sume if (ro.ro_rt) { 1034148385Sume RTFREE(ro.ro_rt); 1035148385Sume } 1036148385Sume m_freem(m); 1037148385Sume return; 103853541Sshin} 103953541Sshin 104053541Sshincaddr_t 1041171259Sdelphijnd6_ifptomac(struct ifnet *ifp) 104253541Sshin{ 104353541Sshin switch (ifp->if_type) { 104453541Sshin case IFT_ARCNET: 104553541Sshin case IFT_ETHER: 104653541Sshin case IFT_FDDI: 104778064Sume case IFT_IEEE1394: 104878468Ssumikawa#ifdef IFT_L2VLAN 104978468Ssumikawa case IFT_L2VLAN: 105078468Ssumikawa#endif 105178064Sume#ifdef IFT_IEEE80211 105278064Sume case IFT_IEEE80211: 105378064Sume#endif 1054142215Sglebius#ifdef IFT_CARP 1055142215Sglebius case IFT_CARP: 1056142215Sglebius#endif 1057149829Sthompsa case IFT_BRIDGE: 1058120049Smdodd case IFT_ISO88025: 1059147306Sbrooks return IF_LLADDR(ifp); 106053541Sshin default: 106153541Sshin return NULL; 106253541Sshin } 106353541Sshin} 106453541Sshin 106560938SjakeTAILQ_HEAD(dadq_head, dadq); 106653541Sshinstruct dadq { 106760938Sjake TAILQ_ENTRY(dadq) dad_list; 106853541Sshin struct ifaddr *dad_ifa; 106953541Sshin int dad_count; /* max NS to send */ 107062587Sitojun int dad_ns_tcount; /* # of trials to send NS */ 107153541Sshin int dad_ns_ocount; /* NS sent so far */ 107253541Sshin int dad_ns_icount; 107353541Sshin int dad_na_icount; 107478064Sume struct callout dad_timer_ch; 107553541Sshin}; 107653541Sshin 107753541Sshinstatic struct dadq_head dadq; 107878064Sumestatic int dad_init = 0; 107953541Sshin 108053541Sshinstatic struct dadq * 1081171259Sdelphijnd6_dad_find(struct ifaddr *ifa) 108253541Sshin{ 108353541Sshin struct dadq *dp; 108453541Sshin 1085181803Sbz for (dp = V_dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) { 108653541Sshin if (dp->dad_ifa == ifa) 108753541Sshin return dp; 108853541Sshin } 108953541Sshin return NULL; 109053541Sshin} 109153541Sshin 109278064Sumestatic void 1093171259Sdelphijnd6_dad_starttimer(struct dadq *dp, int ticks) 109478064Sume{ 109578064Sume 109678064Sume callout_reset(&dp->dad_timer_ch, ticks, 1097175162Sobrien (void (*)(void *))nd6_dad_timer, (void *)dp->dad_ifa); 109878064Sume} 109978064Sume 110078064Sumestatic void 1101171259Sdelphijnd6_dad_stoptimer(struct dadq *dp) 110278064Sume{ 110378064Sume 110478064Sume callout_stop(&dp->dad_timer_ch); 110578064Sume} 110678064Sume 110753541Sshin/* 1108148987Sume * Start Duplicate Address Detection (DAD) for specified interface address. 110953541Sshin */ 111053541Sshinvoid 1111171259Sdelphijnd6_dad_start(struct ifaddr *ifa, int delay) 111253541Sshin{ 111353541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 111453541Sshin struct dadq *dp; 1115165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 111653541Sshin 1117181803Sbz if (!V_dad_init) { 1118181803Sbz TAILQ_INIT(&V_dadq); 1119181803Sbz V_dad_init++; 112053541Sshin } 112153541Sshin 112253541Sshin /* 112353541Sshin * If we don't need DAD, don't do it. 112453541Sshin * There are several cases: 112553541Sshin * - DAD is disabled (ip6_dad_count == 0) 112653541Sshin * - the interface address is anycast 112753541Sshin */ 112853541Sshin if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) { 112962587Sitojun log(LOG_DEBUG, 113062587Sitojun "nd6_dad_start: called with non-tentative address " 113153541Sshin "%s(%s)\n", 1132165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 113353541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 113453541Sshin return; 113553541Sshin } 113653541Sshin if (ia->ia6_flags & IN6_IFF_ANYCAST) { 113753541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 113853541Sshin return; 113953541Sshin } 1140181803Sbz if (!V_ip6_dad_count) { 114153541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 114253541Sshin return; 114353541Sshin } 1144151465Ssuz if (ifa->ifa_ifp == NULL) 114553541Sshin panic("nd6_dad_start: ifa->ifa_ifp == NULL"); 1146120941Sume if (!(ifa->ifa_ifp->if_flags & IFF_UP)) { 114753541Sshin return; 1148120941Sume } 114953541Sshin if (nd6_dad_find(ifa) != NULL) { 115053541Sshin /* DAD already in progress */ 115153541Sshin return; 115253541Sshin } 115353541Sshin 115453541Sshin dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT); 115553541Sshin if (dp == NULL) { 115662587Sitojun log(LOG_ERR, "nd6_dad_start: memory allocation failed for " 115753541Sshin "%s(%s)\n", 1158165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 115953541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 116053541Sshin return; 116153541Sshin } 116253541Sshin bzero(dp, sizeof(*dp)); 116378064Sume callout_init(&dp->dad_timer_ch, 0); 1164182150Sjulian TAILQ_INSERT_TAIL(&V_dadq, (struct dadq *)dp, dad_list); 116553541Sshin 116678064Sume nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp), 1167165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 116853541Sshin 116953541Sshin /* 117053541Sshin * Send NS packet for DAD, ip6_dad_count times. 117153541Sshin * Note that we must delay the first transmission, if this is the 117253541Sshin * first packet to be sent from the interface after interface 117353541Sshin * (re)initialization. 117453541Sshin */ 117553541Sshin dp->dad_ifa = ifa; 117695023Ssuz IFAREF(ifa); /* just for safety */ 1177181803Sbz dp->dad_count = V_ip6_dad_count; 117853541Sshin dp->dad_ns_icount = dp->dad_na_icount = 0; 117962587Sitojun dp->dad_ns_ocount = dp->dad_ns_tcount = 0; 1180151539Ssuz if (delay == 0) { 118162587Sitojun nd6_dad_ns_output(dp, ifa); 1182121161Sume nd6_dad_starttimer(dp, 1183151539Ssuz (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 118453541Sshin } else { 1185151539Ssuz nd6_dad_starttimer(dp, delay); 118653541Sshin } 118753541Sshin} 118853541Sshin 118978064Sume/* 119078064Sume * terminate DAD unconditionally. used for address removals. 119178064Sume */ 119278064Sumevoid 1193171259Sdelphijnd6_dad_stop(struct ifaddr *ifa) 119478064Sume{ 119578064Sume struct dadq *dp; 119678064Sume 1197181803Sbz if (!V_dad_init) 119878064Sume return; 119978064Sume dp = nd6_dad_find(ifa); 120078064Sume if (!dp) { 120178064Sume /* DAD wasn't started yet */ 120278064Sume return; 120378064Sume } 120478064Sume 120578064Sume nd6_dad_stoptimer(dp); 120678064Sume 1207181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 120878064Sume free(dp, M_IP6NDP); 120978064Sume dp = NULL; 121078064Sume IFAFREE(ifa); 121178064Sume} 121278064Sume 121353541Sshinstatic void 1214171259Sdelphijnd6_dad_timer(struct ifaddr *ifa) 121553541Sshin{ 121653541Sshin int s; 121753541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 121853541Sshin struct dadq *dp; 1219165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 122053541Sshin 122195023Ssuz s = splnet(); /* XXX */ 122253541Sshin 122353541Sshin /* Sanity check */ 122453541Sshin if (ia == NULL) { 122562587Sitojun log(LOG_ERR, "nd6_dad_timer: called with null parameter\n"); 122653541Sshin goto done; 122753541Sshin } 122853541Sshin dp = nd6_dad_find(ifa); 122953541Sshin if (dp == NULL) { 123062587Sitojun log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n"); 123153541Sshin goto done; 123253541Sshin } 123353541Sshin if (ia->ia6_flags & IN6_IFF_DUPLICATED) { 123462587Sitojun log(LOG_ERR, "nd6_dad_timer: called with duplicated address " 123553541Sshin "%s(%s)\n", 1236165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 123753541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 123853541Sshin goto done; 123953541Sshin } 124053541Sshin if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) { 124162587Sitojun log(LOG_ERR, "nd6_dad_timer: called with non-tentative address " 124253541Sshin "%s(%s)\n", 1243165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 124453541Sshin ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 124553541Sshin goto done; 124653541Sshin } 124753541Sshin 124862587Sitojun /* timeouted with IFF_{RUNNING,UP} check */ 1249181803Sbz if (dp->dad_ns_tcount > V_dad_maxtry) { 125078064Sume nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n", 1251120941Sume if_name(ifa->ifa_ifp))); 125262587Sitojun 1253181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 125462587Sitojun free(dp, M_IP6NDP); 125562587Sitojun dp = NULL; 125662587Sitojun IFAFREE(ifa); 125762587Sitojun goto done; 125862587Sitojun } 125962587Sitojun 126053541Sshin /* Need more checks? */ 126153541Sshin if (dp->dad_ns_ocount < dp->dad_count) { 126253541Sshin /* 126353541Sshin * We have more NS to go. Send NS packet for DAD. 126453541Sshin */ 126562587Sitojun nd6_dad_ns_output(dp, ifa); 1266120941Sume nd6_dad_starttimer(dp, 1267151539Ssuz (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 126853541Sshin } else { 126953541Sshin /* 127053541Sshin * We have transmitted sufficient number of DAD packets. 127153541Sshin * See what we've got. 127253541Sshin */ 127353541Sshin int duplicate; 127453541Sshin 127553541Sshin duplicate = 0; 127653541Sshin 127753541Sshin if (dp->dad_na_icount) { 127853541Sshin /* 127953541Sshin * the check is in nd6_dad_na_input(), 128053541Sshin * but just in case 128153541Sshin */ 128253541Sshin duplicate++; 128353541Sshin } 128453541Sshin 128553541Sshin if (dp->dad_ns_icount) { 128653541Sshin /* We've seen NS, means DAD has failed. */ 128753541Sshin duplicate++; 128853541Sshin } 128953541Sshin 129053541Sshin if (duplicate) { 129153541Sshin /* (*dp) will be freed in nd6_dad_duplicated() */ 129253541Sshin dp = NULL; 129353541Sshin nd6_dad_duplicated(ifa); 129453541Sshin } else { 129553541Sshin /* 129653541Sshin * We are done with DAD. No NA came, no NS came. 1297148987Sume * No duplicate address found. 129853541Sshin */ 129953541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 130053541Sshin 130178064Sume nd6log((LOG_DEBUG, 130262587Sitojun "%s: DAD complete for %s - no duplicates found\n", 130362587Sitojun if_name(ifa->ifa_ifp), 1304165118Sbz ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 130553541Sshin 1306181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 130753541Sshin free(dp, M_IP6NDP); 130853541Sshin dp = NULL; 130962587Sitojun IFAFREE(ifa); 131053541Sshin } 131153541Sshin } 131253541Sshin 131353541Sshindone: 131453541Sshin splx(s); 131553541Sshin} 131653541Sshin 131753541Sshinvoid 1318171259Sdelphijnd6_dad_duplicated(struct ifaddr *ifa) 131953541Sshin{ 132053541Sshin struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1321151477Ssuz struct ifnet *ifp; 132253541Sshin struct dadq *dp; 1323165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 132453541Sshin 132553541Sshin dp = nd6_dad_find(ifa); 132653541Sshin if (dp == NULL) { 132762587Sitojun log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n"); 132853541Sshin return; 132953541Sshin } 133053541Sshin 133178064Sume log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: " 133278064Sume "NS in/out=%d/%d, NA in=%d\n", 1333165118Sbz if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 133478064Sume dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount); 133553541Sshin 133653541Sshin ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 133753541Sshin ia->ia6_flags |= IN6_IFF_DUPLICATED; 133853541Sshin 1339148987Sume /* We are done with DAD, with duplicate address found. (failure) */ 134078064Sume nd6_dad_stoptimer(dp); 134153541Sshin 1342151477Ssuz ifp = ifa->ifa_ifp; 134362587Sitojun log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n", 1344165118Sbz if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)); 134562587Sitojun log(LOG_ERR, "%s: manual intervention required\n", 1346151477Ssuz if_name(ifp)); 134753541Sshin 1348151477Ssuz /* 1349151477Ssuz * If the address is a link-local address formed from an interface 1350151477Ssuz * identifier based on the hardware address which is supposed to be 1351151477Ssuz * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP 1352151477Ssuz * operation on the interface SHOULD be disabled. 1353151477Ssuz * [rfc2462bis-03 Section 5.4.5] 1354151477Ssuz */ 1355151477Ssuz if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) { 1356151477Ssuz struct in6_addr in6; 1357151477Ssuz 1358151477Ssuz /* 1359151477Ssuz * To avoid over-reaction, we only apply this logic when we are 1360151477Ssuz * very sure that hardware addresses are supposed to be unique. 1361151477Ssuz */ 1362151477Ssuz switch (ifp->if_type) { 1363151477Ssuz case IFT_ETHER: 1364151477Ssuz case IFT_FDDI: 1365151477Ssuz case IFT_ATM: 1366151477Ssuz case IFT_IEEE1394: 1367151477Ssuz#ifdef IFT_IEEE80211 1368151477Ssuz case IFT_IEEE80211: 1369151477Ssuz#endif 1370151477Ssuz in6 = ia->ia_addr.sin6_addr; 1371151477Ssuz if (in6_get_hw_ifid(ifp, &in6) == 0 && 1372151477Ssuz IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) { 1373151477Ssuz ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED; 1374151477Ssuz log(LOG_ERR, "%s: possible hardware address " 1375151477Ssuz "duplication detected, disable IPv6\n", 1376151477Ssuz if_name(ifp)); 1377151477Ssuz } 1378151477Ssuz break; 1379151477Ssuz } 1380151477Ssuz } 1381151477Ssuz 1382181803Sbz TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list); 138353541Sshin free(dp, M_IP6NDP); 138453541Sshin dp = NULL; 138562587Sitojun IFAFREE(ifa); 138653541Sshin} 138753541Sshin 138862587Sitojunstatic void 1389171259Sdelphijnd6_dad_ns_output(struct dadq *dp, 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 1407171259Sdelphijnd6_dad_ns_input(struct ifaddr *ifa) 140853541Sshin{ 140953541Sshin struct in6_ifaddr *ia; 141053541Sshin struct ifnet *ifp; 141178064Sume const struct in6_addr *taddr6; 141253541Sshin struct dadq *dp; 141353541Sshin int duplicate; 141453541Sshin 1415151465Ssuz if (ifa == NULL) 141653541Sshin panic("ifa == NULL in nd6_dad_ns_input"); 141753541Sshin 141853541Sshin ia = (struct in6_ifaddr *)ifa; 141953541Sshin ifp = ifa->ifa_ifp; 142053541Sshin taddr6 = &ia->ia_addr.sin6_addr; 142153541Sshin duplicate = 0; 142253541Sshin dp = nd6_dad_find(ifa); 142353541Sshin 142453541Sshin /* Quickhack - completely ignore DAD NS packets */ 1425181803Sbz if (V_dad_ignore_ns) { 1426165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 142778064Sume nd6log((LOG_INFO, 142878064Sume "nd6_dad_ns_input: ignoring DAD NS packet for " 1429165118Sbz "address %s(%s)\n", ip6_sprintf(ip6buf, taddr6), 143078064Sume if_name(ifa->ifa_ifp))); 143153541Sshin return; 143253541Sshin } 143353541Sshin 143453541Sshin /* 143553541Sshin * if I'm yet to start DAD, someone else started using this address 143653541Sshin * first. I have a duplicate and you win. 143753541Sshin */ 1438151465Ssuz if (dp == NULL || dp->dad_ns_ocount == 0) 143953541Sshin duplicate++; 144053541Sshin 144153541Sshin /* XXX more checks for loopback situation - see nd6_dad_timer too */ 144253541Sshin 144353541Sshin if (duplicate) { 144453541Sshin dp = NULL; /* will be freed in nd6_dad_duplicated() */ 144553541Sshin nd6_dad_duplicated(ifa); 144653541Sshin } else { 144753541Sshin /* 144853541Sshin * not sure if I got a duplicate. 144953541Sshin * increment ns count and see what happens. 145053541Sshin */ 145153541Sshin if (dp) 145253541Sshin dp->dad_ns_icount++; 145353541Sshin } 145453541Sshin} 145553541Sshin 145662587Sitojunstatic void 1457171259Sdelphijnd6_dad_na_input(struct ifaddr *ifa) 145853541Sshin{ 145953541Sshin struct dadq *dp; 146053541Sshin 1461151465Ssuz if (ifa == NULL) 146253541Sshin panic("ifa == NULL in nd6_dad_na_input"); 146353541Sshin 146453541Sshin dp = nd6_dad_find(ifa); 146553541Sshin if (dp) 146653541Sshin dp->dad_na_icount++; 146753541Sshin 146853541Sshin /* remove the address. */ 146953541Sshin nd6_dad_duplicated(ifa); 147053541Sshin} 1471