/* * Copyright (c) 2000-2012 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* $FreeBSD: src/sys/netinet6/nd6_nbr.c,v 1.4.2.4 2001/07/06 05:32:25 sumikawa Exp $ */ /* $KAME: nd6_nbr.c,v 1.64 2001/05/17 03:48:30 itojun Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if IPSEC #include #if INET6 #include #endif extern int ipsec_bypass; #endif #include struct dadq; static struct dadq *nd6_dad_find(struct ifaddr *); void nd6_dad_stoptimer(struct ifaddr *); static void nd6_dad_timer(struct ifaddr *); static void nd6_dad_ns_output(struct dadq *, struct ifaddr *); static void nd6_dad_ns_input(struct ifaddr *); static void nd6_dad_na_input(struct ifaddr *, caddr_t, int); static void dad_addref(struct dadq *, int); static void dad_remref(struct dadq *); static struct dadq *nd6_dad_attach(struct dadq *, struct ifaddr *); static void nd6_dad_detach(struct dadq *, struct ifaddr *); static int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/ static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */ static unsigned int dad_size; /* size of zone element */ static struct zone *dad_zone; /* zone for dadq */ #define DAD_ZONE_MAX 64 /* maximum elements in zone */ #define DAD_ZONE_NAME "nd6_dad" /* zone name */ #define DAD_LOCK_ASSERT_HELD(_dp) \ lck_mtx_assert(&(_dp)->dad_lock, LCK_MTX_ASSERT_OWNED) #define DAD_LOCK_ASSERT_NOTHELD(_dp) \ lck_mtx_assert(&(_dp)->dad_lock, LCK_MTX_ASSERT_NOTOWNED) #define DAD_LOCK(_dp) \ lck_mtx_lock(&(_dp)->dad_lock) #define DAD_LOCK_SPIN(_dp) \ lck_mtx_lock_spin(&(_dp)->dad_lock) #define DAD_CONVERT_LOCK(_dp) do { \ DAD_LOCK_ASSERT_HELD(_dp); \ lck_mtx_convert_spin(&(_dp)->dad_lock); \ } while (0) #define DAD_UNLOCK(_dp) \ lck_mtx_unlock(&(_dp)->dad_lock) #define DAD_ADDREF(_dp) \ dad_addref(_dp, 0) #define DAD_ADDREF_LOCKED(_dp) \ dad_addref(_dp, 1) #define DAD_REMREF(_dp) \ dad_remref(_dp) extern lck_mtx_t *dad6_mutex; extern lck_mtx_t *nd6_mutex; extern int in6_get_hw_ifid(struct ifnet *, struct in6_addr *); static int nd6_llreach_base = (LL_BASE_REACHABLE / 1000); /* seconds */ static struct sockaddr_in6 hostrtmask; SYSCTL_DECL(_net_inet6_icmp6); SYSCTL_INT(_net_inet6_icmp6, OID_AUTO, nd6_llreach_base, CTLFLAG_RW | CTLFLAG_LOCKED, &nd6_llreach_base, LL_BASE_REACHABLE, "default ND6 link-layer reachability max lifetime (in seconds)"); /* * Obtain a link-layer source cache entry for the sender. * * NOTE: This is currently only for ND6/Ethernet. */ void nd6_llreach_alloc(struct rtentry *rt, struct ifnet *ifp, void *addr, unsigned int alen, boolean_t solicited) { struct llinfo_nd6 *ln = rt->rt_llinfo; if (nd6_llreach_base != 0 && (ln->ln_expire != 0 || (ifp->if_eflags & IFEF_IPV6_ND6ALT) != 0) && rt->rt_ifp != lo_ifp && ifp->if_addrlen == IF_LLREACH_MAXLEN && /* Ethernet */ alen == ifp->if_addrlen) { struct if_llreach *lr; const char *why = NULL, *type = ""; /* Become a regular mutex, just in case */ RT_CONVERT_LOCK(rt); if ((lr = ln->ln_llreach) != NULL) { type = (solicited ? "ND6 advertisement" : "ND6 unsolicited announcement"); /* * If target has changed, create a new record; * otherwise keep existing record. */ IFLR_LOCK(lr); if (bcmp(addr, lr->lr_key.addr, alen) != 0) { IFLR_UNLOCK(lr); /* Purge any link-layer info caching */ VERIFY(rt->rt_llinfo_purge != NULL); rt->rt_llinfo_purge(rt); lr = NULL; why = " for different target HW address; " "using new llreach record"; } else { lr->lr_probes = 0; /* reset probe count */ IFLR_UNLOCK(lr); if (solicited) { why = " for same target HW address; " "keeping existing llreach record"; } } } if (lr == NULL) { lr = ln->ln_llreach = ifnet_llreach_alloc(ifp, ETHERTYPE_IPV6, addr, alen, nd6_llreach_base); if (lr != NULL) { lr->lr_probes = 0; /* reset probe count */ if (why == NULL) why = "creating new llreach record"; } } if (nd6_debug && lr != NULL && why != NULL) { char tmp[MAX_IPv6_STR_LEN]; nd6log((LOG_DEBUG, "%s%d: %s%s for %s\n", ifp->if_name, ifp->if_unit, type, why, inet_ntop(AF_INET6, &SIN6(rt_key(rt))->sin6_addr, tmp, sizeof (tmp)))); } } } void nd6_llreach_use(struct llinfo_nd6 *ln) { if (ln->ln_llreach != NULL) ln->ln_lastused = net_uptime(); } /* * Input a Neighbor Solicitation Message. * * Based on RFC 2461 * Based on RFC 2462 (duplicate address detection) */ void nd6_ns_input( struct mbuf *m, int off, int icmp6len) { struct ifnet *ifp = m->m_pkthdr.rcvif; struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); struct nd_neighbor_solicit *nd_ns; struct in6_addr saddr6 = ip6->ip6_src; struct in6_addr daddr6 = ip6->ip6_dst; struct in6_addr taddr6; struct in6_addr myaddr6; char *lladdr = NULL; struct ifaddr *ifa = NULL; int lladdrlen = 0; int anycast = 0, proxy = 0, dadprogress = 0; int tlladdr; union nd_opts ndopts; struct sockaddr_dl proxydl; boolean_t advrouter; if ((ifp->if_eflags & IFEF_IPV6_ND6ALT) != 0) { nd6log((LOG_INFO, "nd6_ns_input: on ND6ALT interface!\n")); return; } /* Expect 32-bit aligned data pointer on strict-align platforms */ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m); #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, icmp6len, return); nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off); #else IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len); if (nd_ns == NULL) { icmp6stat.icp6s_tooshort++; return; } #endif ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */ taddr6 = nd_ns->nd_ns_target; if (in6_setscope(&taddr6, ifp, NULL) != 0) goto bad; if (ip6->ip6_hlim != IPV6_MAXHLIM) { nd6log((LOG_ERR, "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n", ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); goto bad; } if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { /* dst has to be a solicited node multicast address. */ if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL && /* don't check ifindex portion */ daddr6.s6_addr32[1] == 0 && daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE && daddr6.s6_addr8[12] == 0xff) { ; /* good */ } else { nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " "(wrong ip6 dst)\n")); goto bad; } } else if (!nd6_onlink_ns_rfc4861) { struct sockaddr_in6 src_sa6; /* * According to recent IETF discussions, it is not a good idea * to accept a NS from an address which would not be deemed * to be a neighbor otherwise. This point is expected to be * clarified in future revisions of the specification. */ bzero(&src_sa6, sizeof(src_sa6)); src_sa6.sin6_family = AF_INET6; src_sa6.sin6_len = sizeof(src_sa6); src_sa6.sin6_addr = saddr6; if (!nd6_is_addr_neighbor(&src_sa6, ifp, 0)) { nd6log((LOG_INFO, "nd6_ns_input: " "NS packet from non-neighbor\n")); goto bad; } } if (IN6_IS_ADDR_MULTICAST(&taddr6)) { nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n")); goto bad; } icmp6len -= sizeof(*nd_ns); nd6_option_init(nd_ns + 1, icmp6len, &ndopts); if (nd6_options(&ndopts) < 0) { nd6log((LOG_INFO, "nd6_ns_input: invalid ND option, ignored\n")); /* nd6_options have incremented stats */ goto freeit; } if (ndopts.nd_opts_src_lladdr) { lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; } if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) { nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " "(link-layer address option)\n")); goto bad; } /* * Attaching target link-layer address to the NA? * (RFC 2461 7.2.4) * * NS IP dst is unicast/anycast MUST NOT add * NS IP dst is solicited-node multicast MUST add * * In implementation, we add target link-layer address by default. * We do not add one in MUST NOT cases. */ if (!IN6_IS_ADDR_MULTICAST(&daddr6)) tlladdr = 0; else tlladdr = 1; /* * Target address (taddr6) must be either: * (1) Valid unicast/anycast address for my receiving interface, * (2) Unicast address for which I'm offering proxy service, or * (3) "tentative" or "optimistic" address [DAD is in progress]. */ /* (1) and (3) check. */ ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); /* (2) check. */ if (ifa == NULL) { struct rtentry *rt; struct sockaddr_in6 tsin6; bzero(&tsin6, sizeof tsin6); tsin6.sin6_len = sizeof(struct sockaddr_in6); tsin6.sin6_family = AF_INET6; tsin6.sin6_addr = taddr6; rt = rtalloc1_scoped((struct sockaddr *)&tsin6, 0, 0, ifp->if_index); if (rt != NULL) { RT_LOCK(rt); if ((rt->rt_flags & RTF_ANNOUNCE) != 0 && rt->rt_gateway->sa_family == AF_LINK) { /* * proxy NDP for single entry */ ifa = (struct ifaddr *)in6ifa_ifpforlinklocal( ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST); if (ifa) { proxy = 1; proxydl = *SDL(rt->rt_gateway); } } RT_UNLOCK(rt); rtfree(rt); } } if (ifa == NULL && ip6_forwarding && nd6_prproxy) { /* * Is the target address part of the prefix that is being * proxied and installed on another interface? */ ifa = (struct ifaddr *)in6ifa_prproxyaddr(&taddr6); } if (ifa == NULL) { /* * We've got an NS packet, and we don't have that address * assigned for us. We MUST silently ignore it on this * interface, c.f. RFC 4861 7.2.3. * * Forwarding associated with NDPRF_PRPROXY may apply. */ if (ip6_forwarding && nd6_prproxy) nd6_prproxy_ns_input(ifp, &saddr6, lladdr, lladdrlen, &daddr6, &taddr6); goto freeit; } IFA_LOCK(ifa); myaddr6 = *IFA_IN6(ifa); anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST; dadprogress = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DADPROGRESS; if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED) { IFA_UNLOCK(ifa); goto freeit; } IFA_UNLOCK(ifa); if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s " "(if %d, NS packet %d)\n", ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2)); goto bad; } if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) { nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n", ip6_sprintf(&saddr6))); goto freeit; } /* * We have neighbor solicitation packet, with target address equals to * one of my DAD in-progress addresses. * * src addr how to process? * --- --- * multicast of course, invalid (rejected in ip6_input) * unicast somebody is doing address resolution -> ignore * unspec dup address detection * * The processing is defined in RFC 2462 (and updated by RFC 4429) */ if (dadprogress) { /* * If source address is unspecified address, it is for * duplicate address detection. * * If not, the packet is for addess resolution; * silently ignore it. */ if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) nd6_dad_ns_input(ifa); goto freeit; } /* Are we an advertising router on this interface? */ advrouter = (ifp->if_eflags & IFEF_IPV6_ROUTER); /* * If the source address is unspecified address, entries must not * be created or updated. * It looks that sender is performing DAD. If I'm using the address, * and it's a "preferred" address, i.e. not optimistic, then output NA * toward all-node multicast address, to tell the sender that I'm using * the address. * S bit ("solicited") must be zero. */ if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { saddr6 = in6addr_linklocal_allnodes; if (in6_setscope(&saddr6, ifp, NULL) != 0) goto bad; if ((dadprogress & IN6_IFF_OPTIMISTIC) == 0) nd6_na_output(ifp, &saddr6, &taddr6, ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | (advrouter ? ND_NA_FLAG_ROUTER : 0), tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL); goto freeit; } nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_NEIGHBOR_SOLICIT, 0); nd6_na_output(ifp, &saddr6, &taddr6, ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | (advrouter ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL); freeit: m_freem(m); if (ifa != NULL) IFA_REMREF(ifa); return; bad: nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6))); nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6))); nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6))); icmp6stat.icp6s_badns++; m_freem(m); if (ifa != NULL) IFA_REMREF(ifa); } /* * Output a Neighbor Solicitation Message. Caller specifies: * - ICMP6 header source IP6 address * - ND6 header target IP6 address * - ND6 header source datalink address * * Based on RFC 2461 * Based on RFC 2462 (duplicate address detection) * Updated by RFC 4429 (optimistic duplicate address detection) * * Caller must bump up ln->ln_rt refcnt to make sure 'ln' doesn't go * away if there is a llinfo_nd6 passed in. */ void nd6_ns_output( struct ifnet *ifp, const struct in6_addr *daddr6, const struct in6_addr *taddr6, struct llinfo_nd6 *ln, /* for source address determination */ int dad) /* duplicated address detection */ { struct mbuf *m; struct ip6_hdr *ip6; struct nd_neighbor_solicit *nd_ns; struct in6_ifaddr *ia = NULL; struct in6_addr *src, src_in, src_storage; struct ip6_moptions *im6o = NULL; struct ifnet *outif = NULL; int icmp6len; int maxlen; int flags; caddr_t mac; struct route_in6 ro; struct ip6_out_args ip6oa = { IFSCOPE_NONE, { 0 }, IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR }; u_int32_t rtflags = 0; if ((ifp->if_eflags & IFEF_IPV6_ND6ALT) || IN6_IS_ADDR_MULTICAST(taddr6)) return; bzero(&ro, sizeof(ro)); ip6oa.ip6oa_boundif = ifp->if_index; ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF; /* estimate the size of message */ maxlen = sizeof(*ip6) + sizeof(*nd_ns); maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; if (max_linkhdr + maxlen >= MCLBYTES) { #if DIAGNOSTIC printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES " "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); #endif return; } MGETHDR(m, M_DONTWAIT, MT_DATA); /* XXXMAC: mac_create_mbuf_linklayer() probably */ if (m && max_linkhdr + maxlen >= MHLEN) { MCLGET(m, M_DONTWAIT); if ((m->m_flags & M_EXT) == 0) { m_free(m); m = NULL; } } if (m == NULL) return; m->m_pkthdr.rcvif = NULL; if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) { m->m_flags |= M_MCAST; im6o = ip6_allocmoptions(M_DONTWAIT); if (im6o == NULL) { m_freem(m); return; } im6o->im6o_multicast_ifp = ifp; im6o->im6o_multicast_hlim = IPV6_MAXHLIM; im6o->im6o_multicast_loop = 0; } icmp6len = sizeof(*nd_ns); m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len; m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ /* fill neighbor solicitation packet */ ip6 = mtod(m, struct ip6_hdr *); ip6->ip6_flow = 0; ip6->ip6_vfc &= ~IPV6_VERSION_MASK; ip6->ip6_vfc |= IPV6_VERSION; /* ip6->ip6_plen will be set later */ ip6->ip6_nxt = IPPROTO_ICMPV6; ip6->ip6_hlim = IPV6_MAXHLIM; if (daddr6) ip6->ip6_dst = *daddr6; else { ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; ip6->ip6_dst.s6_addr16[1] = 0; ip6->ip6_dst.s6_addr32[1] = 0; ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE; ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3]; ip6->ip6_dst.s6_addr8[12] = 0xff; if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) goto bad; } if (!dad) { /* * RFC2461 7.2.2: * "If the source address of the packet prompting the * solicitation is the same as one of the addresses assigned * to the outgoing interface, that address SHOULD be placed * in the IP Source Address of the outgoing solicitation. * Otherwise, any one of the addresses assigned to the * interface should be used." * * We use the source address for the prompting packet * (saddr6), if: * - saddr6 is given from the caller (by giving "ln"), and * - saddr6 belongs to the outgoing interface. * Otherwise, we perform the source address selection as usual. */ struct ip6_hdr *hip6; /* hold ip6 */ struct in6_addr *hsrc = NULL; /* Caller holds ref on this route */ if (ln != NULL) { RT_LOCK(ln->ln_rt); /* * assuming every packet in ln_hold has the same IP * header */ if (ln->ln_hold != NULL) { hip6 = mtod(ln->ln_hold, struct ip6_hdr *); /* XXX pullup? */ if (sizeof (*hip6) < ln->ln_hold->m_len) hsrc = &hip6->ip6_src; else hsrc = NULL; } /* Update probe count, if applicable */ if (ln->ln_llreach != NULL) { IFLR_LOCK_SPIN(ln->ln_llreach); ln->ln_llreach->lr_probes++; IFLR_UNLOCK(ln->ln_llreach); } rtflags = ln->ln_rt->rt_flags; RT_UNLOCK(ln->ln_rt); } if (ia != NULL) { IFA_REMREF(&ia->ia_ifa); ia = NULL; } if (hsrc != NULL && (ia = in6ifa_ifpwithaddr(ifp, hsrc)) && (ia->ia6_flags & IN6_IFF_OPTIMISTIC) == 0) { src = hsrc; } else { int error; struct sockaddr_in6 dst_sa; bzero(&dst_sa, sizeof(dst_sa)); dst_sa.sin6_family = AF_INET6; dst_sa.sin6_len = sizeof(dst_sa); dst_sa.sin6_addr = ip6->ip6_dst; src = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, &src_storage, ip6oa.ip6oa_boundif, &error); if (src == NULL) { nd6log((LOG_DEBUG, "nd6_ns_output: source can't be " "determined: dst=%s, error=%d\n", ip6_sprintf(&dst_sa.sin6_addr), error)); goto bad; } ia = in6ifa_ifpwithaddr(ifp, src); if (!ia || (ia->ia6_flags & IN6_IFF_OPTIMISTIC)) { nd6log((LOG_DEBUG, "nd6_ns_output: no preferred source " "available: dst=%s\n", ip6_sprintf(&dst_sa.sin6_addr))); goto bad; } } } else { /* * Source address for DAD packet must always be IPv6 * unspecified address. (0::0) * We actually don't have to 0-clear the address (we did it * above), but we do so here explicitly to make the intention * clearer. */ bzero(&src_in, sizeof(src_in)); src = &src_in; ip6oa.ip6oa_flags &= ~IP6OAF_BOUND_SRCADDR; } ip6->ip6_src = *src; nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1); nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT; nd_ns->nd_ns_code = 0; nd_ns->nd_ns_reserved = 0; nd_ns->nd_ns_target = *taddr6; in6_clearscope(&nd_ns->nd_ns_target); /* XXX */ /* * Add source link-layer address option. * * spec implementation * --- --- * DAD packet MUST NOT do not add the option * there's no link layer address: * impossible do not add the option * there's link layer address: * Multicast NS MUST add one add the option * Unicast NS SHOULD add one add the option */ if (!dad && (mac = nd6_ifptomac(ifp))) { int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); /* 8 byte alignments... */ optlen = (optlen + 7) & ~7; m->m_pkthdr.len += optlen; m->m_len += optlen; icmp6len += optlen; bzero((caddr_t)nd_opt, optlen); nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; nd_opt->nd_opt_len = optlen >> 3; bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); } ip6->ip6_plen = htons((u_short)icmp6len); nd_ns->nd_ns_cksum = 0; nd_ns->nd_ns_cksum = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len); #if IPSEC /* Don't lookup socket */ if (ipsec_bypass == 0) (void)ipsec_setsocket(m, NULL); #endif flags = dad ? IPV6_UNSPECSRC : 0; flags |= IPV6_OUTARGS; /* * If this is a NS for resolving the (default) router, mark * the packet accordingly so that the driver can find out, * in case it needs to perform driver-specific action(s). */ if (rtflags & RTF_ROUTER) { m->m_pkthdr.aux_flags |= MAUXF_INET6_RESOLVE_RTR; VERIFY(!(m->m_pkthdr.aux_flags & MAUXF_INET_RESOLVE_RTR)); } if (ifp->if_eflags & IFEF_TXSTART) { /* Use control service class if the interface * supports transmit-start model */ (void) m_set_service_class(m, MBUF_SC_CTL); } ip6_output(m, NULL, NULL, flags, im6o, &outif, &ip6oa); if (outif) { icmp6_ifstat_inc(outif, ifs6_out_msg); icmp6_ifstat_inc(outif, ifs6_out_neighborsolicit); ifnet_release(outif); } icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++; if (im6o != NULL) IM6O_REMREF(im6o); if (ro.ro_rt) { /* we don't cache this route. */ rtfree(ro.ro_rt); } if (ia != NULL) IFA_REMREF(&ia->ia_ifa); return; bad: if (im6o != NULL) IM6O_REMREF(im6o); if (ro.ro_rt) { rtfree(ro.ro_rt); } m_freem(m); if (ia != NULL) IFA_REMREF(&ia->ia_ifa); return; } /* * Neighbor advertisement input handling. * * Based on RFC 2461 * Based on RFC 2462 (duplicate address detection) * * the following items are not implemented yet: * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) */ void nd6_na_input( struct mbuf *m, int off, int icmp6len) { struct ifnet *ifp = m->m_pkthdr.rcvif; struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); struct nd_neighbor_advert *nd_na; struct in6_addr saddr6 = ip6->ip6_src; struct in6_addr daddr6 = ip6->ip6_dst; struct in6_addr taddr6; int flags; int is_router; int is_solicited; int is_override; char *lladdr = NULL; int lladdrlen = 0; struct ifaddr *ifa = NULL; struct llinfo_nd6 *ln; struct rtentry *rt; struct sockaddr_dl *sdl; union nd_opts ndopts; struct timeval timenow; if ((ifp->if_eflags & IFEF_IPV6_ND6ALT) != 0) { nd6log((LOG_INFO, "nd6_na_input: on ND6ALT interface!\n")); return; } /* Expect 32-bit aligned data pointer on strict-align platforms */ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m); if (ip6->ip6_hlim != IPV6_MAXHLIM) { nd6log((LOG_ERR, "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n", ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); goto bad; } #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, icmp6len, return); nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off); #else IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len); if (nd_na == NULL) { icmp6stat.icp6s_tooshort++; return; } #endif flags = nd_na->nd_na_flags_reserved; is_router = ((flags & ND_NA_FLAG_ROUTER) != 0); is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0); is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0); taddr6 = nd_na->nd_na_target; if (in6_setscope(&taddr6, ifp, NULL)) goto bad; /* XXX: impossible */ if (IN6_IS_ADDR_MULTICAST(&taddr6)) { nd6log((LOG_ERR, "nd6_na_input: invalid target address %s\n", ip6_sprintf(&taddr6))); goto bad; } if (IN6_IS_ADDR_MULTICAST(&daddr6)) if (is_solicited) { nd6log((LOG_ERR, "nd6_na_input: a solicited adv is multicasted\n")); goto bad; } icmp6len -= sizeof(*nd_na); nd6_option_init(nd_na + 1, icmp6len, &ndopts); if (nd6_options(&ndopts) < 0) { nd6log((LOG_INFO, "nd6_na_input: invalid ND option, ignored\n")); /* nd6_options have incremented stats */ goto freeit; } if (ndopts.nd_opts_tgt_lladdr) { lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; } ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); /* * Target address matches one of my interface address. * * If my address is tentative or optimistic, this means that there's * somebody already using the same address as mine. This indicates DAD * failure. This is defined in RFC 2462 and updated by RFC 4429. * * Otherwise, process as defined in RFC 2461. */ if (ifa != NULL) { IFA_LOCK(ifa); if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DADPROGRESS) { struct nd_ifinfo *ndi; boolean_t ignorena = FALSE; IFA_UNLOCK(ifa); lck_rw_lock_shared(nd_if_rwlock); ndi = ND_IFINFO(ifp); if (ndi != NULL && ndi->initialized) { lck_mtx_lock(&ndi->lock); ignorena = ndi->flags & ND6_IFF_IGNORE_NA; lck_mtx_unlock(&ndi->lock); } lck_rw_done(nd_if_rwlock); if (ignorena) log(LOG_ERR, "%s: ignoring duplicate DAD due " "to sleep proxy (%s)\n", __func__, if_name(ifp)); else nd6_dad_na_input(ifa, lladdr, lladdrlen); goto freeit; } IFA_UNLOCK(ifa); } /* Just for safety, maybe unnecessary. */ if (ifa) { log(LOG_ERR, "nd6_na_input: duplicate IP6 address %s\n", ip6_sprintf(&taddr6)); goto freeit; } if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s " "(if %d, NA packet %d)\n", ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2)); goto bad; } /* Forwarding associated with NDPRF_PRPROXY may apply. */ if (ip6_forwarding && nd6_prproxy) nd6_prproxy_na_input(ifp, &saddr6, &daddr6, &taddr6, flags); /* * If no neighbor cache entry is found, NA SHOULD silently be * discarded. If we are forwarding (and Scoped Routing is in * effect), try to see if there is a neighbor cache entry on * another interface (in case we are doing prefix proxying.) */ if ((rt = nd6_lookup(&taddr6, 0, ifp, 0)) == NULL) { if (!ip6_forwarding || !ip6_doscopedroute || !nd6_prproxy) goto freeit; if ((rt = nd6_lookup(&taddr6, 0, NULL, 0)) == NULL) goto freeit; RT_LOCK_ASSERT_HELD(rt); if (rt->rt_ifp != ifp) { /* * Purge any link-layer info caching. */ if (rt->rt_llinfo_purge != NULL) rt->rt_llinfo_purge(rt); /* Adjust route ref count for the interfaces */ if (rt->rt_if_ref_fn != NULL) { rt->rt_if_ref_fn(ifp, 1); rt->rt_if_ref_fn(rt->rt_ifp, -1); } /* Change the interface when the existing route is on */ rt->rt_ifp = ifp; } } RT_LOCK_ASSERT_HELD(rt); if ((ln = rt->rt_llinfo) == NULL || (sdl = SDL(rt->rt_gateway)) == NULL) { RT_REMREF_LOCKED(rt); RT_UNLOCK(rt); goto freeit; } getmicrotime(&timenow); if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { /* * If the link-layer has address, and no lladdr option came, * discard the packet. */ if (ifp->if_addrlen && !lladdr) { RT_REMREF_LOCKED(rt); RT_UNLOCK(rt); goto freeit; } /* * Record link-layer address, and update the state. */ sdl->sdl_alen = ifp->if_addrlen; bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); if (is_solicited) { ln->ln_state = ND6_LLINFO_REACHABLE; ln->ln_byhint = 0; if (ln->ln_expire) { struct nd_ifinfo *ndi; lck_rw_lock_shared(nd_if_rwlock); ndi = ND_IFINFO(rt->rt_ifp); VERIFY(ndi != NULL && ndi->initialized); lck_mtx_lock(&ndi->lock); ln->ln_expire = rt_expiry(rt, timenow.tv_sec, ndi->reachable); lck_mtx_unlock(&ndi->lock); lck_rw_done(nd_if_rwlock); } } else { ln->ln_state = ND6_LLINFO_STALE; ln->ln_expire = rt_expiry(rt, timenow.tv_sec, nd6_gctimer); } if ((ln->ln_router = is_router) != 0) { /* * This means a router's state has changed from * non-reachable to probably reachable, and might * affect the status of associated prefixes.. */ RT_UNLOCK(rt); lck_mtx_lock(nd6_mutex); pfxlist_onlink_check(); lck_mtx_unlock(nd6_mutex); RT_LOCK(rt); } } else { int llchange; /* * Check if the link-layer address has changed or not. */ if (!lladdr) llchange = 0; else { if (sdl->sdl_alen) { if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) llchange = 1; else llchange = 0; } else llchange = 1; } /* * This is VERY complex. Look at it with care. * * override solicit lladdr llchange action * (L: record lladdr) * * 0 0 n -- (2c) * 0 0 y n (2b) L * 0 0 y y (1) REACHABLE->STALE * 0 1 n -- (2c) *->REACHABLE * 0 1 y n (2b) L *->REACHABLE * 0 1 y y (1) REACHABLE->STALE * 1 0 n -- (2a) * 1 0 y n (2a) L * 1 0 y y (2a) L *->STALE * 1 1 n -- (2a) *->REACHABLE * 1 1 y n (2a) L *->REACHABLE * 1 1 y y (2a) L *->REACHABLE */ if (!is_override && (lladdr != NULL && llchange)) { /* (1) */ /* * If state is REACHABLE, make it STALE. * no other updates should be done. */ if (ln->ln_state == ND6_LLINFO_REACHABLE) { ln->ln_state = ND6_LLINFO_STALE; ln->ln_expire = rt_expiry(rt, timenow.tv_sec, nd6_gctimer); } RT_REMREF_LOCKED(rt); RT_UNLOCK(rt); goto freeit; } else if (is_override /* (2a) */ || (!is_override && (lladdr && !llchange)) /* (2b) */ || !lladdr) { /* (2c) */ /* * Update link-local address, if any. */ if (lladdr) { sdl->sdl_alen = ifp->if_addrlen; bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); } /* * If solicited, make the state REACHABLE. * If not solicited and the link-layer address was * changed, make it STALE. */ if (is_solicited) { ln->ln_state = ND6_LLINFO_REACHABLE; ln->ln_byhint = 0; if (ln->ln_expire) { struct nd_ifinfo *ndi; lck_rw_lock_shared(nd_if_rwlock); ndi = ND_IFINFO(ifp); VERIFY(ndi != NULL && ndi->initialized); lck_mtx_lock(&ndi->lock); ln->ln_expire = rt_expiry(rt, timenow.tv_sec, ndi->reachable); lck_mtx_unlock(&ndi->lock); lck_rw_done(nd_if_rwlock); } } else { if (lladdr && llchange) { ln->ln_state = ND6_LLINFO_STALE; ln->ln_expire = rt_expiry(rt, timenow.tv_sec, nd6_gctimer); } } } if (ln->ln_router && !is_router) { /* * The peer dropped the router flag. * Remove the sender from the Default Router List and * update the Destination Cache entries. */ struct nd_defrouter *dr; struct in6_addr *in6; struct ifnet *rt_ifp = rt->rt_ifp; in6 = &((struct sockaddr_in6 *) (void *)rt_key(rt))->sin6_addr; RT_UNLOCK(rt); lck_mtx_lock(nd6_mutex); dr = defrouter_lookup(in6, rt_ifp); if (dr) { defrtrlist_del(dr); NDDR_REMREF(dr); lck_mtx_unlock(nd6_mutex); } else { lck_mtx_unlock(nd6_mutex); if (ip6_doscopedroute || !ip6_forwarding) { /* * Even if the neighbor is not in the * default router list, the neighbor * may be used as a next hop for some * destinations (e.g. redirect case). * So we must call rt6_flush explicitly. */ rt6_flush(&ip6->ip6_src, rt_ifp); } } RT_LOCK(rt); } ln->ln_router = is_router; } RT_LOCK_ASSERT_HELD(rt); rt->rt_flags &= ~RTF_REJECT; /* cache the gateway (sender HW) address */ nd6_llreach_alloc(rt, ifp, LLADDR(sdl), sdl->sdl_alen, TRUE); /* update the llinfo, send a queued packet if there is one */ ln->ln_asked = 0; if (ln->ln_hold != NULL) { struct mbuf *m_hold, *m_hold_next; struct sockaddr_in6 sin6; rtkey_to_sa6(rt, &sin6); /* * reset the ln_hold in advance, to explicitly * prevent a ln_hold lookup in nd6_output() * (wouldn't happen, though...) */ for (m_hold = ln->ln_hold; m_hold; m_hold = m_hold_next) { m_hold_next = m_hold->m_nextpkt; m_hold->m_nextpkt = NULL; /* * we assume ifp is not a loopback here, so just set * the 2nd argument as the 1st one. */ RT_UNLOCK(rt); nd6_output(ifp, ifp, m_hold, &sin6, rt, NULL); RT_LOCK_SPIN(rt); } ln->ln_hold = NULL; } RT_REMREF_LOCKED(rt); RT_UNLOCK(rt); freeit: m_freem(m); if (ifa != NULL) IFA_REMREF(ifa); return; bad: icmp6stat.icp6s_badna++; m_freem(m); if (ifa != NULL) IFA_REMREF(ifa); } /* * Neighbor advertisement output handling. * * Based on RFC 2461 * * the following items are not implemented yet: * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) * * tlladdr - 1 if include target link-layer address * sdl0 - sockaddr_dl (= proxy NA) or NULL */ void nd6_na_output( struct ifnet *ifp, const struct in6_addr *daddr6_0, const struct in6_addr *taddr6, uint32_t flags, int tlladdr, /* 1 if include target link-layer address */ struct sockaddr *sdl0) /* sockaddr_dl (= proxy NA) or NULL */ { struct mbuf *m; struct ip6_hdr *ip6; struct nd_neighbor_advert *nd_na; struct ip6_moptions *im6o = NULL; caddr_t mac = NULL; struct route_in6 ro; struct in6_addr *src, src_storage, daddr6; struct in6_ifaddr *ia; struct sockaddr_in6 dst_sa; int icmp6len, maxlen, error; struct ifnet *outif = NULL; struct ip6_out_args ip6oa = { IFSCOPE_NONE, { 0 }, IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR }; bzero(&ro, sizeof(ro)); daddr6 = *daddr6_0; /* make a local copy for modification */ ip6oa.ip6oa_boundif = ifp->if_index; ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF; /* estimate the size of message */ maxlen = sizeof(*ip6) + sizeof(*nd_na); maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; if (max_linkhdr + maxlen >= MCLBYTES) { #if DIAGNOSTIC printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES " "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); #endif return; } MGETHDR(m, M_DONTWAIT, MT_DATA); /* XXXMAC: mac_create_mbuf_linklayer() probably */ if (m && max_linkhdr + maxlen >= MHLEN) { MCLGET(m, M_DONTWAIT); if ((m->m_flags & M_EXT) == 0) { m_free(m); m = NULL; } } if (m == NULL) return; m->m_pkthdr.rcvif = NULL; if (IN6_IS_ADDR_MULTICAST(&daddr6)) { m->m_flags |= M_MCAST; im6o = ip6_allocmoptions(M_DONTWAIT); if (im6o == NULL) { m_freem(m); return; } im6o->im6o_multicast_ifp = ifp; im6o->im6o_multicast_hlim = IPV6_MAXHLIM; im6o->im6o_multicast_loop = 0; } icmp6len = sizeof(*nd_na); m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len; m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ /* fill neighbor advertisement packet */ ip6 = mtod(m, struct ip6_hdr *); ip6->ip6_flow = 0; ip6->ip6_vfc &= ~IPV6_VERSION_MASK; ip6->ip6_vfc |= IPV6_VERSION; ip6->ip6_nxt = IPPROTO_ICMPV6; ip6->ip6_hlim = IPV6_MAXHLIM; if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) { /* reply to DAD */ daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL; daddr6.s6_addr16[1] = 0; daddr6.s6_addr32[1] = 0; daddr6.s6_addr32[2] = 0; daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE; if (in6_setscope(&daddr6, ifp, NULL)) goto bad; flags &= ~ND_NA_FLAG_SOLICITED; } else ip6->ip6_dst = daddr6; bzero(&dst_sa, sizeof(struct sockaddr_in6)); dst_sa.sin6_family = AF_INET6; dst_sa.sin6_len = sizeof(struct sockaddr_in6); dst_sa.sin6_addr = daddr6; /* * Select a source whose scope is the same as that of the dest. */ bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa)); src = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, &src_storage, ip6oa.ip6oa_boundif, &error); if (src == NULL) { nd6log((LOG_DEBUG, "nd6_na_output: source can't be " "determined: dst=%s, error=%d\n", ip6_sprintf(&dst_sa.sin6_addr), error)); goto bad; } ip6->ip6_src = *src; /* * RFC 4429 requires not setting "override" flag on NA packets sent * from optimistic addresses. */ ia = in6ifa_ifpwithaddr(ifp, src); if (ia != NULL) { if (ia->ia6_flags & IN6_IFF_OPTIMISTIC) flags &= ~ND_NA_FLAG_OVERRIDE; IFA_REMREF(&ia->ia_ifa); } nd_na = (struct nd_neighbor_advert *)(ip6 + 1); nd_na->nd_na_type = ND_NEIGHBOR_ADVERT; nd_na->nd_na_code = 0; nd_na->nd_na_target = *taddr6; in6_clearscope(&nd_na->nd_na_target); /* XXX */ /* * "tlladdr" indicates NS's condition for adding tlladdr or not. * see nd6_ns_input() for details. * Basically, if NS packet is sent to unicast/anycast addr, * target lladdr option SHOULD NOT be included. */ if (tlladdr) { /* * sdl0 != NULL indicates proxy NA. If we do proxy, use * lladdr in sdl0. If we are not proxying (sending NA for * my address) use lladdr configured for the interface. */ if (sdl0 == NULL) mac = nd6_ifptomac(ifp); else if (sdl0->sa_family == AF_LINK) { struct sockaddr_dl *sdl; sdl = (struct sockaddr_dl *)(void *)sdl0; if (sdl->sdl_alen == ifp->if_addrlen) mac = LLADDR(sdl); } } if (tlladdr && mac) { int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1); /* roundup to 8 bytes alignment! */ optlen = (optlen + 7) & ~7; m->m_pkthdr.len += optlen; m->m_len += optlen; icmp6len += optlen; bzero((caddr_t)nd_opt, optlen); nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; nd_opt->nd_opt_len = optlen >> 3; bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); } else flags &= ~ND_NA_FLAG_OVERRIDE; ip6->ip6_plen = htons((u_short)icmp6len); nd_na->nd_na_flags_reserved = flags; nd_na->nd_na_cksum = 0; nd_na->nd_na_cksum = in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len); #if IPSEC /* Don't lookup socket */ if (ipsec_bypass == 0) (void)ipsec_setsocket(m, NULL); #endif if (ifp->if_eflags & IFEF_TXSTART) { /* Use control service class if the interface supports * transmit-start model. */ (void) m_set_service_class(m, MBUF_SC_CTL); } ip6_output(m, NULL, NULL, IPV6_OUTARGS, im6o, &outif, &ip6oa); if (outif) { icmp6_ifstat_inc(outif, ifs6_out_msg); icmp6_ifstat_inc(outif, ifs6_out_neighboradvert); ifnet_release(outif); } icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++; if (im6o != NULL) IM6O_REMREF(im6o); if (ro.ro_rt) { rtfree(ro.ro_rt); } return; bad: if (im6o != NULL) IM6O_REMREF(im6o); if (ro.ro_rt) { rtfree(ro.ro_rt); } m_freem(m); return; } caddr_t nd6_ifptomac( struct ifnet *ifp) { switch (ifp->if_type) { case IFT_ARCNET: case IFT_ETHER: case IFT_IEEE8023ADLAG: case IFT_FDDI: case IFT_IEEE1394: #ifdef IFT_L2VLAN case IFT_L2VLAN: #endif #ifdef IFT_IEEE80211 case IFT_IEEE80211: #endif #ifdef IFT_CARP case IFT_CARP: #endif case IFT_BRIDGE: case IFT_ISO88025: return ((caddr_t)ifnet_lladdr(ifp)); default: return NULL; } } TAILQ_HEAD(dadq_head, dadq); struct dadq { decl_lck_mtx_data(, dad_lock); u_int32_t dad_refcount; /* reference count */ int dad_attached; TAILQ_ENTRY(dadq) dad_list; struct ifaddr *dad_ifa; int dad_count; /* max NS to send */ int dad_ns_tcount; /* # of trials to send NS */ int dad_ns_ocount; /* NS sent so far */ int dad_ns_icount; int dad_na_icount; int dad_na_ixcount; /* Count of IFDISABLED eligible NA rx'd */ }; static struct dadq_head dadq; void nd6_nbr_init(void) { int i; TAILQ_INIT(&dadq); dad_size = sizeof (struct dadq); dad_zone = zinit(dad_size, DAD_ZONE_MAX * dad_size, 0, DAD_ZONE_NAME); if (dad_zone == NULL) { panic("%s: failed allocating %s", __func__, DAD_ZONE_NAME); /* NOTREACHED */ } zone_change(dad_zone, Z_EXPAND, TRUE); zone_change(dad_zone, Z_CALLERACCT, FALSE); bzero(&hostrtmask, sizeof hostrtmask); hostrtmask.sin6_family = AF_INET6; hostrtmask.sin6_len = sizeof hostrtmask; for (i = 0; i < sizeof hostrtmask.sin6_addr; ++i) hostrtmask.sin6_addr.s6_addr[i] = 0xff; } static struct dadq * nd6_dad_find(struct ifaddr *ifa) { struct dadq *dp; lck_mtx_lock(dad6_mutex); for (dp = dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) { DAD_LOCK_SPIN(dp); if (dp->dad_ifa == ifa) { DAD_ADDREF_LOCKED(dp); DAD_UNLOCK(dp); lck_mtx_unlock(dad6_mutex); return (dp); } DAD_UNLOCK(dp); } lck_mtx_unlock(dad6_mutex); return (NULL); } void nd6_dad_stoptimer( struct ifaddr *ifa) { untimeout((void (*)(void *))nd6_dad_timer, (void *)ifa); } /* * Start Duplicate Address Detection (DAD) for specified interface address. */ void nd6_dad_start( struct ifaddr *ifa, int *tick_delay) /* minimum delay ticks for IFF_UP event */ { struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; struct dadq *dp; /* * If we don't need DAD, don't do it. * There are several cases: * - DAD is disabled (ip6_dad_count == 0) * - the interface address is anycast */ IFA_LOCK(&ia->ia_ifa); if (!(ia->ia6_flags & IN6_IFF_DADPROGRESS)) { log(LOG_DEBUG, "nd6_dad_start: not a tentative or optimistic address " "%s(%s)\n", ip6_sprintf(&ia->ia_addr.sin6_addr), ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); IFA_UNLOCK(&ia->ia_ifa); return; } if (!ip6_dad_count || (ia->ia6_flags & IN6_IFF_ANYCAST) != 0) { ia->ia6_flags &= ~IN6_IFF_DADPROGRESS; IFA_UNLOCK(&ia->ia_ifa); return; } IFA_UNLOCK(&ia->ia_ifa); if (ifa->ifa_ifp == NULL) panic("nd6_dad_start: ifa->ifa_ifp == NULL"); if (!(ifa->ifa_ifp->if_flags & IFF_UP) || (ifa->ifa_ifp->if_eflags & IFEF_IPV6_ND6ALT)) { return; } if ((dp = nd6_dad_find(ifa)) != NULL) { DAD_REMREF(dp); /* DAD already in progress */ return; } dp = zalloc(dad_zone); if (dp == NULL) { log(LOG_ERR, "nd6_dad_start: memory allocation failed for " "%s(%s)\n", ip6_sprintf(&ia->ia_addr.sin6_addr), ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); return; } bzero(dp, dad_size); lck_mtx_init(&dp->dad_lock, ifa_mtx_grp, ifa_mtx_attr); /* Callee adds one reference for us */ dp = nd6_dad_attach(dp, ifa); nd6log((LOG_DEBUG, "%s: starting %sDAD for %s\n", if_name(ifa->ifa_ifp), (ia->ia_flags & IN6_IFF_OPTIMISTIC) ? "optimistic " : "", ip6_sprintf(&ia->ia_addr.sin6_addr))); /* * Send NS packet for DAD, ip6_dad_count times. * Note that we must delay the first transmission, if this is the * first packet to be sent from the interface after interface * (re)initialization. */ if (tick_delay == NULL) { u_int32_t retrans; struct nd_ifinfo *ndi; nd6_dad_ns_output(dp, ifa); lck_rw_lock_shared(nd_if_rwlock); ndi = ND_IFINFO(ifa->ifa_ifp); VERIFY(ndi != NULL && ndi->initialized); lck_mtx_lock(&ndi->lock); retrans = ndi->retrans * hz / 1000; lck_mtx_unlock(&ndi->lock); lck_rw_done(nd_if_rwlock); timeout((void (*)(void *))nd6_dad_timer, (void *)ifa, retrans); } else { int ntick; if (*tick_delay == 0) ntick = random() % (MAX_RTR_SOLICITATION_DELAY * hz); else ntick = *tick_delay + random() % (hz / 2); *tick_delay = ntick; timeout((void (*)(void *))nd6_dad_timer, (void *)ifa, ntick); } DAD_REMREF(dp); /* drop our reference */ } static struct dadq * nd6_dad_attach(struct dadq *dp, struct ifaddr *ifa) { lck_mtx_lock(dad6_mutex); DAD_LOCK(dp); dp->dad_ifa = ifa; IFA_ADDREF(ifa); /* for dad_ifa */ dp->dad_count = ip6_dad_count; dp->dad_ns_icount = dp->dad_na_icount = 0; dp->dad_ns_ocount = dp->dad_ns_tcount = 0; dp->dad_na_ixcount = 0; VERIFY(!dp->dad_attached); dp->dad_attached = 1; DAD_ADDREF_LOCKED(dp); /* for caller */ DAD_ADDREF_LOCKED(dp); /* for dadq_head list */ TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list); DAD_UNLOCK(dp); lck_mtx_unlock(dad6_mutex); return (dp); } static void nd6_dad_detach(struct dadq *dp, struct ifaddr *ifa) { int detached; lck_mtx_lock(dad6_mutex); DAD_LOCK(dp); if ((detached = dp->dad_attached)) { VERIFY(dp->dad_ifa == ifa); TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); dp->dad_list.tqe_next = NULL; dp->dad_list.tqe_prev = NULL; dp->dad_attached = 0; } DAD_UNLOCK(dp); lck_mtx_unlock(dad6_mutex); if (detached) { DAD_REMREF(dp); /* drop dadq_head reference */ } } /* * terminate DAD unconditionally. used for address removals. */ void nd6_dad_stop(struct ifaddr *ifa) { struct dadq *dp; dp = nd6_dad_find(ifa); if (!dp) { /* DAD wasn't started yet */ return; } untimeout((void (*)(void *))nd6_dad_timer, (void *)ifa); nd6_dad_detach(dp, ifa); DAD_REMREF(dp); /* drop our reference */ } static void nd6_unsol_na_output(struct ifaddr *ifa) { struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; struct ifnet *ifp = ifa->ifa_ifp; struct in6_addr saddr6, taddr6; if ((ifp->if_flags & IFF_UP) == 0 || (ifp->if_flags & IFF_RUNNING) == 0 || (ifp->if_eflags & IFEF_IPV6_ND6ALT) != 0) return; IFA_LOCK_SPIN(&ia->ia_ifa); taddr6 = ia->ia_addr.sin6_addr; IFA_UNLOCK(&ia->ia_ifa); if (in6_setscope(&taddr6, ifp, NULL) != 0) return; saddr6 = in6addr_linklocal_allnodes; if (in6_setscope(&saddr6, ifp, NULL) != 0) return; nd6log((LOG_INFO, "%s: sending unsolicited NA\n", if_name(ifa->ifa_ifp))); nd6_na_output(ifp, &saddr6, &taddr6, ND_NA_FLAG_OVERRIDE, 1, NULL); } static void nd6_dad_timer(struct ifaddr *ifa) { struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; struct dadq *dp = NULL; /* Sanity check */ if (ia == NULL) { log(LOG_ERR, "nd6_dad_timer: called with null parameter\n"); goto done; } dp = nd6_dad_find(ifa); if (dp == NULL) { log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n"); goto done; } IFA_LOCK(&ia->ia_ifa); if (ia->ia6_flags & IN6_IFF_DUPLICATED) { log(LOG_ERR, "nd6_dad_timer: called with duplicated address " "%s(%s)\n", ip6_sprintf(&ia->ia_addr.sin6_addr), ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); IFA_UNLOCK(&ia->ia_ifa); goto done; } if ((ia->ia6_flags & IN6_IFF_DADPROGRESS) == 0) { log(LOG_ERR, "nd6_dad_timer: not a tentative or optimistic " "address %s(%s)\n", ip6_sprintf(&ia->ia_addr.sin6_addr), ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); IFA_UNLOCK(&ia->ia_ifa); goto done; } IFA_UNLOCK(&ia->ia_ifa); /* timeouted with IFF_{RUNNING,UP} check */ DAD_LOCK(dp); if (dp->dad_ns_tcount > dad_maxtry) { DAD_UNLOCK(dp); nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n", if_name(ifa->ifa_ifp))); nd6_dad_detach(dp, ifa); goto done; } /* Need more checks? */ if (dp->dad_ns_ocount < dp->dad_count) { u_int32_t retrans; struct nd_ifinfo *ndi; DAD_UNLOCK(dp); /* * We have more NS to go. Send NS packet for DAD. */ nd6_dad_ns_output(dp, ifa); lck_rw_lock_shared(nd_if_rwlock); ndi = ND_IFINFO(ifa->ifa_ifp); VERIFY(ndi != NULL && ndi->initialized); lck_mtx_lock(&ndi->lock); retrans = ndi->retrans * hz / 1000; lck_mtx_unlock(&ndi->lock); lck_rw_done(nd_if_rwlock); timeout((void (*)(void *))nd6_dad_timer, (void *)ifa, retrans); } else { /* * We have transmitted sufficient number of DAD packets. * See what we've got. */ int duplicate; duplicate = 0; if (dp->dad_na_icount) { /* * the check is in nd6_dad_na_input(), * but just in case */ duplicate++; } if (dp->dad_ns_icount) { /* We've seen NS, means DAD has failed. */ duplicate++; } DAD_UNLOCK(dp); if (duplicate) { /* (*dp) will be freed in nd6_dad_duplicated() */ nd6_dad_duplicated(ifa, TRUE); } else { /* * We are done with DAD. No NA came, no NS came. * No duplicate address found. */ IFA_LOCK_SPIN(&ia->ia_ifa); ia->ia6_flags &= ~IN6_IFF_DADPROGRESS; IFA_UNLOCK(&ia->ia_ifa); nd6log((LOG_DEBUG, "%s: DAD complete for %s - no duplicates found\n", if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr))); /* * Send an Unsolicited Neighbor Advertisement so that * other machines on the network are aware of us * (important when we are waking from sleep). */ nd6_unsol_na_output(ifa); in6_post_msg(ia->ia_ifp, KEV_INET6_NEW_USER_ADDR, ia); nd6_dad_detach(dp, ifa); } } done: if (dp != NULL) DAD_REMREF(dp); /* drop our reference */ } void nd6_dad_duplicated(struct ifaddr *ifa, boolean_t dontignhwdup) { struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; struct dadq *dp; struct ifnet *ifp = ifa->ifa_ifp; int hwdupposs; dp = nd6_dad_find(ifa); if (dp == NULL) { log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n"); return; } hwdupposs = 0; IFA_LOCK(&ia->ia_ifa); DAD_LOCK(dp); log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: " "NS in/out=%d/%d, NA in=%d inx=%d\n", if_name(ifp), ip6_sprintf(&ia->ia_addr.sin6_addr), dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount, dp->dad_na_ixcount); hwdupposs = dp->dad_na_ixcount; DAD_UNLOCK(dp); ia->ia6_flags &= ~IN6_IFF_DADPROGRESS; ia->ia6_flags |= IN6_IFF_DUPLICATED; IFA_UNLOCK(&ia->ia_ifa); /* We are done with DAD, with duplicated address found. (failure) */ untimeout((void (*)(void *))nd6_dad_timer, (void *)ifa); IFA_LOCK(&ia->ia_ifa); log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n", if_name(ifp), ip6_sprintf(&ia->ia_addr.sin6_addr)); log(LOG_ERR, "%s: manual intervention required\n", if_name(ifp)); IFA_UNLOCK(&ia->ia_ifa); if (hwdupposs || (dontignhwdup && IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr))) { log(LOG_ERR, "%s: possible hardware address duplication " "detected, disable IPv6\n", if_name(ifp)); lck_rw_lock_shared(nd_if_rwlock); nd_ifinfo[ifp->if_index].flags |= ND6_IFF_IFDISABLED; lck_rw_done(nd_if_rwlock); } /* Send an event to the configuration agent so that the * duplicate address will be notified to the user and will * be removed. */ in6_post_msg(ifp, KEV_INET6_NEW_USER_ADDR, ia); nd6_dad_detach(dp, ifa); DAD_REMREF(dp); /* drop our reference */ } static void nd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa) { struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; struct ifnet *ifp = ifa->ifa_ifp; struct in6_addr taddr6; DAD_LOCK(dp); dp->dad_ns_tcount++; if ((ifp->if_flags & IFF_UP) == 0) { DAD_UNLOCK(dp); return; } if ((ifp->if_flags & IFF_RUNNING) == 0) { DAD_UNLOCK(dp); return; } dp->dad_ns_ocount++; DAD_UNLOCK(dp); IFA_LOCK_SPIN(&ia->ia_ifa); taddr6 = ia->ia_addr.sin6_addr; IFA_UNLOCK(&ia->ia_ifa); nd6_ns_output(ifp, NULL, &taddr6, NULL, 1); } static void nd6_dad_ns_input(struct ifaddr *ifa) { struct dadq *dp; int duplicate; struct ifnet *ifp; if (ifa == NULL) panic("ifa == NULL in nd6_dad_ns_input"); ifp = ifa->ifa_ifp; duplicate = 0; dp = nd6_dad_find(ifa); /* Quickhack - completely ignore DAD NS packets */ if (dad_ignore_ns) { struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; IFA_LOCK(&ia->ia_ifa); nd6log((LOG_INFO, "nd6_dad_ns_input: ignoring DAD NS packet for " "address %s(%s)\n", ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifa->ifa_ifp))); IFA_UNLOCK(&ia->ia_ifa); return; } /* * if I'm yet to start DAD, someone else started using this address * first. I have a duplicate and you win. */ if (dp != NULL) DAD_LOCK(dp); if (dp == NULL || dp->dad_ns_ocount == 0) duplicate++; /* XXX more checks for loopback situation - see nd6_dad_timer too */ if (duplicate) { if (dp != NULL) { DAD_UNLOCK(dp); DAD_REMREF(dp); dp = NULL; } nd6_dad_duplicated(ifa, TRUE); } else if (dp != NULL) { /* * not sure if I got a duplicate. * increment ns count and see what happens. */ dp->dad_ns_icount++; DAD_UNLOCK(dp); DAD_REMREF(dp); } } static void nd6_dad_na_input(struct ifaddr *ifa, caddr_t lladdr, int lladdrlen) { struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; struct dadq *dp; int hwdupposs; if (ifa == NULL) panic("ifa == NULL in nd6_dad_na_input"); dp = nd6_dad_find(ifa); if (dp == NULL) { log(LOG_ERR, "nd6_dad_na_input: DAD structure not found\n"); return; } /* * If the address is a link-local address formed from an interface * identifier based on the hardware address which is supposed to be * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP * operation on the interface SHOULD be disabled according to RFC 4862, * section 5.4.5, but here we decide not to disable if the target * hardware address is not also ours, which is a transitory possibility * in the presence of network-resident sleep proxies on the local link. */ hwdupposs = 0; IFA_LOCK(ifa); if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) { struct ifnet *ifp; struct in6_addr in6; IFA_UNLOCK(ifa); ifp = ifa->ifa_ifp; /* * To avoid over-reaction, we only apply this logic when we are * very sure that hardware addresses are supposed to be unique. */ switch (ifp->if_type) { case IFT_BRIDGE: case IFT_ETHER: case IFT_FDDI: case IFT_ATM: case IFT_IEEE1394: #ifdef IFT_IEEE80211 case IFT_IEEE80211: #endif /* Check if our hardware address matches the target */ if (lladdr != NULL && lladdrlen > 0) { struct ifaddr *llifa; struct sockaddr_dl *sdl; llifa = ifp->if_lladdr; IFA_LOCK(llifa); sdl = (struct sockaddr_dl *)(void *) llifa->ifa_addr; if (lladdrlen == sdl->sdl_alen || bcmp(lladdr, LLADDR(sdl), lladdrlen) == 0) hwdupposs = 1; IFA_UNLOCK(llifa); } in6 = ia->ia_addr.sin6_addr; if (in6_get_hw_ifid(ifp, &in6) != 0) break; /* * Apply this logic only to the EUI-64 form of * link-local interface identifiers. */ IFA_LOCK(ifa); if (hwdupposs && !IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) { hwdupposs = 0; } else if (lladdr == NULL && IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) { /* * We received a NA with no target link-layer * address option. This means that someone else * has our address. Mark it as a hardware * duplicate so we disable IPv6 later on. */ hwdupposs = 1; } IFA_UNLOCK(ifa); break; default: break; } } else { IFA_UNLOCK(ifa); } DAD_LOCK_SPIN(dp); dp->dad_na_icount++; if (hwdupposs) dp->dad_na_ixcount++; DAD_UNLOCK(dp); DAD_REMREF(dp); /* remove the address. */ nd6_dad_duplicated(ifa, FALSE); } static void dad_addref(struct dadq *dp, int locked) { if (!locked) DAD_LOCK_SPIN(dp); else DAD_LOCK_ASSERT_HELD(dp); if (++dp->dad_refcount == 0) { panic("%s: dad %p wraparound refcnt\n", __func__, dp); /* NOTREACHED */ } if (!locked) DAD_UNLOCK(dp); } static void dad_remref(struct dadq *dp) { struct ifaddr *ifa; DAD_LOCK_SPIN(dp); if (dp->dad_refcount == 0) panic("%s: dad %p negative refcnt\n", __func__, dp); --dp->dad_refcount; if (dp->dad_refcount > 0) { DAD_UNLOCK(dp); return; } DAD_UNLOCK(dp); if (dp->dad_attached || dp->dad_list.tqe_next != NULL || dp->dad_list.tqe_prev != NULL) { panic("%s: attached dad=%p is being freed", __func__, dp); /* NOTREACHED */ } if ((ifa = dp->dad_ifa) != NULL) { IFA_REMREF(ifa); /* drop dad_ifa reference */ dp->dad_ifa = NULL; } lck_mtx_destroy(&dp->dad_lock, ifa_mtx_grp); zfree(dad_zone, dp); } void nd6_llreach_set_reachable(struct ifnet *ifp, void *addr, unsigned int alen) { /* Nothing more to do if it's disabled */ if (nd6_llreach_base == 0) return; ifnet_llreach_set_reachable(ifp, ETHERTYPE_IPV6, addr, alen); } void nd6_alt_node_addr_decompose(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr_dl* sdl, struct sockaddr_in6 *sin6) { static const size_t EUI64_LENGTH = 8; VERIFY(nd6_need_cache(ifp)); VERIFY(sa); VERIFY(sdl && (void *)sa != (void *)sdl); VERIFY(sin6 && (void *)sa != (void *)sin6); bzero(sin6, sizeof *sin6); sin6->sin6_len = sizeof *sin6; sin6->sin6_family = AF_INET6; bzero(sdl, sizeof *sdl); sdl->sdl_len = sizeof *sdl; sdl->sdl_family = AF_LINK; sdl->sdl_type = ifp->if_type; sdl->sdl_index = ifp->if_index; switch (sa->sa_family) { case AF_INET6: { struct sockaddr_in6 *sin6a = (struct sockaddr_in6 *)(void *)sa; struct in6_addr *in6 = &sin6a->sin6_addr; VERIFY(sa->sa_len == sizeof *sin6); sdl->sdl_nlen = strlen(ifp->if_name); bcopy(ifp->if_name, sdl->sdl_data, sdl->sdl_nlen); if (in6->s6_addr[11] == 0xff && in6->s6_addr[12] == 0xfe) { sdl->sdl_alen = ETHER_ADDR_LEN; LLADDR(sdl)[0] = (in6->s6_addr[8] ^ ND6_EUI64_UBIT); LLADDR(sdl)[1] = in6->s6_addr[9]; LLADDR(sdl)[2] = in6->s6_addr[10]; LLADDR(sdl)[3] = in6->s6_addr[13]; LLADDR(sdl)[4] = in6->s6_addr[14]; LLADDR(sdl)[5] = in6->s6_addr[15]; } else { sdl->sdl_alen = EUI64_LENGTH; bcopy(&in6->s6_addr[8], LLADDR(sdl), EUI64_LENGTH); } sdl->sdl_slen = 0; break; } case AF_LINK: { struct sockaddr_dl *sdla = (struct sockaddr_dl *)(void *)sa; struct in6_addr *in6 = &sin6->sin6_addr; caddr_t lla = LLADDR(sdla); VERIFY(sa->sa_len <= sizeof *sdl); bcopy(sa, sdl, sa->sa_len); sin6->sin6_scope_id = sdla->sdl_index; if (sin6->sin6_scope_id == 0) sin6->sin6_scope_id = ifp->if_index; in6->s6_addr[0] = 0xfe; in6->s6_addr[1] = 0x80; if (sdla->sdl_alen == EUI64_LENGTH) bcopy(lla, &in6->s6_addr[8], EUI64_LENGTH); else { VERIFY(sdla->sdl_alen == ETHER_ADDR_LEN); in6->s6_addr[8] = ((uint8_t) lla[0] ^ ND6_EUI64_UBIT); in6->s6_addr[9] = (uint8_t) lla[1]; in6->s6_addr[10] = (uint8_t) lla[2]; in6->s6_addr[11] = 0xff; in6->s6_addr[12] = 0xfe; in6->s6_addr[13] = (uint8_t) lla[3]; in6->s6_addr[14] = (uint8_t) lla[4]; in6->s6_addr[15] = (uint8_t) lla[5]; } break; } default: VERIFY(false); break; } } void nd6_alt_node_present(struct ifnet *ifp, struct sockaddr_in6 *sin6, struct sockaddr_dl *sdl, int32_t rssi, int lqm, int npm) { struct rtentry *rt; struct llinfo_nd6 *ln; struct if_llreach *lr; nd6_cache_lladdr(ifp, &sin6->sin6_addr, LLADDR(sdl), sdl->sdl_alen, ND_NEIGHBOR_ADVERT, 0); lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_NOTOWNED); lck_mtx_lock(rnh_lock); rt = rtalloc1_scoped_locked((struct sockaddr *)sin6, 1, 0, ifp->if_index); if (rt != NULL) { RT_LOCK(rt); VERIFY(rt->rt_flags & RTF_LLINFO); VERIFY(rt->rt_llinfo); ln = rt->rt_llinfo; ln->ln_state = ND6_LLINFO_REACHABLE; ln->ln_expire = 0; lr = ln->ln_llreach; if (lr) { IFLR_LOCK(lr); lr->lr_rssi = rssi; lr->lr_lqm = (int32_t) lqm; lr->lr_npm = (int32_t) npm; IFLR_UNLOCK(lr); } RT_UNLOCK(rt); RT_REMREF(rt); } lck_mtx_unlock(rnh_lock); if (rt == NULL) { log(LOG_ERR, "%s: failed to add/update host route to %s.\n", __func__, ip6_sprintf(&sin6->sin6_addr)); } else { nd6log((LOG_DEBUG, "%s: host route to %s [lr=%p]\n", __func__, ip6_sprintf(&sin6->sin6_addr), lr)); } } void nd6_alt_node_absent(struct ifnet *ifp, struct sockaddr_in6 *sin6) { struct rtentry *rt; nd6log((LOG_DEBUG, "%s: host route to %s\n", __func__, ip6_sprintf(&sin6->sin6_addr))); lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_NOTOWNED); lck_mtx_lock(rnh_lock); rt = rtalloc1_scoped_locked((struct sockaddr *)sin6, 0, 0, ifp->if_index); if (rt != NULL) { RT_LOCK(rt); if (!(rt->rt_flags & (RTF_PINNED|RTF_CLONING|RTF_PRCLONING)) && (rt->rt_flags & (RTF_HOST|RTF_LLINFO|RTF_WASCLONED)) == (RTF_HOST|RTF_LLINFO|RTF_WASCLONED)) { rt->rt_flags |= RTF_CONDEMNED; RT_UNLOCK(rt); (void) rtrequest_locked(RTM_DELETE, rt_key(rt), (struct sockaddr *)NULL, rt_mask(rt), 0, (struct rtentry **)NULL); rtfree_locked(rt); } else { RT_REMREF_LOCKED(rt); RT_UNLOCK(rt); } } lck_mtx_unlock(rnh_lock); }