Index: head/sys/netinet6/in6_ifattach.c =================================================================== --- head/sys/netinet6/in6_ifattach.c (revision 151476) +++ head/sys/netinet6/in6_ifattach.c (revision 151477) @@ -1,911 +1,910 @@ /* $FreeBSD$ */ /* $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 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 unsigned long in6_maxmtu = 0; #ifdef IP6_AUTO_LINKLOCAL int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; #else int ip6_auto_linklocal = 1; /* enable by default */ #endif struct callout in6_tmpaddrtimer_ch; extern struct inpcbinfo udbinfo; extern struct inpcbinfo ripcbinfo; static int get_rand_ifid __P((struct ifnet *, struct in6_addr *)); static int generate_tmp_ifid __P((u_int8_t *, const u_int8_t *, u_int8_t *)); -static int get_hw_ifid __P((struct ifnet *, struct in6_addr *)); static int get_ifid __P((struct ifnet *, struct ifnet *, struct in6_addr *)); static int in6_ifattach_linklocal __P((struct ifnet *, struct ifnet *)); static int in6_ifattach_loopback __P((struct ifnet *)); #define EUI64_GBIT 0x01 #define EUI64_UBIT 0x02 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) /* * Generate a last-resort interface identifier, when the machine has no * IEEE802/EUI64 address sources. * The goal here is to get an interface identifier that is * (1) random enough and (2) does not change across reboot. * We currently use MD5(hostname) for it. */ static int get_rand_ifid(ifp, in6) struct ifnet *ifp; struct in6_addr *in6; /* upper 64bits are preserved */ { MD5_CTX ctxt; u_int8_t digest[16]; int hostnamelen = strlen(hostname); #if 0 /* we need at least several letters as seed for ifid */ if (hostnamelen < 3) return -1; #endif /* generate 8 bytes of pseudo-random value. */ bzero(&ctxt, sizeof(ctxt)); MD5Init(&ctxt); MD5Update(&ctxt, hostname, hostnamelen); MD5Final(digest, &ctxt); /* assumes sizeof(digest) > sizeof(ifid) */ bcopy(digest, &in6->s6_addr[8], 8); /* make sure to set "u" bit to local, and "g" bit to individual. */ in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ /* convert EUI64 into IPv6 interface identifier */ EUI64_TO_IFID(in6); return 0; } static int generate_tmp_ifid(seed0, seed1, ret) u_int8_t *seed0, *ret; const u_int8_t *seed1; { MD5_CTX ctxt; u_int8_t seed[16], digest[16], nullbuf[8]; u_int32_t val32; /* If there's no hisotry, start with a random seed. */ bzero(nullbuf, sizeof(nullbuf)); if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { int i; for (i = 0; i < 2; i++) { val32 = arc4random(); bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); } } else bcopy(seed0, seed, 8); /* copy the right-most 64-bits of the given address */ /* XXX assumption on the size of IFID */ bcopy(seed1, &seed[8], 8); if (0) { /* for debugging purposes only */ int i; printf("generate_tmp_ifid: new randomized ID from: "); for (i = 0; i < 16; i++) printf("%02x", seed[i]); printf(" "); } /* generate 16 bytes of pseudo-random value. */ bzero(&ctxt, sizeof(ctxt)); MD5Init(&ctxt); MD5Update(&ctxt, seed, sizeof(seed)); MD5Final(digest, &ctxt); /* * RFC 3041 3.2.1. (3) * Take the left-most 64-bits of the MD5 digest and set bit 6 (the * left-most bit is numbered 0) to zero. */ bcopy(digest, ret, 8); ret[0] &= ~EUI64_UBIT; /* * XXX: we'd like to ensure that the generated value is not zero * for simplicity. If the caclculated digest happens to be zero, * use a random non-zero value as the last resort. */ if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { nd6log((LOG_INFO, "generate_tmp_ifid: computed MD5 value is zero.\n")); val32 = arc4random(); val32 = 1 + (val32 % (0xffffffff - 1)); } /* * RFC 3041 3.2.1. (4) * Take the rightmost 64-bits of the MD5 digest and save them in * stable storage as the history value to be used in the next * iteration of the algorithm. */ bcopy(&digest[8], seed0, 8); if (0) { /* for debugging purposes only */ int i; printf("to: "); for (i = 0; i < 16; i++) printf("%02x", digest[i]); printf("\n"); } return 0; } /* * Get interface identifier for the specified interface. * XXX assumes single sockaddr_dl (AF_LINK address) per an interface */ -static int -get_hw_ifid(ifp, in6) +int +in6_get_hw_ifid(ifp, in6) struct ifnet *ifp; struct in6_addr *in6; /* upper 64bits are preserved */ { struct ifaddr *ifa; struct sockaddr_dl *sdl; u_int8_t *addr; size_t addrlen; static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; static u_int8_t allone[8] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { if (ifa->ifa_addr->sa_family != AF_LINK) continue; sdl = (struct sockaddr_dl *)ifa->ifa_addr; if (sdl == NULL) continue; if (sdl->sdl_alen == 0) continue; goto found; } return -1; found: addr = LLADDR(sdl); addrlen = sdl->sdl_alen; /* get EUI64 */ switch (ifp->if_type) { case IFT_ETHER: case IFT_FDDI: case IFT_ISO88025: case IFT_ATM: case IFT_IEEE1394: #ifdef IFT_IEEE80211 case IFT_IEEE80211: #endif /* IEEE802/EUI64 cases - what others? */ /* IEEE1394 uses 16byte length address starting with EUI64 */ if (addrlen > 8) addrlen = 8; /* look at IEEE802/EUI64 only */ if (addrlen != 8 && addrlen != 6) return -1; /* * check for invalid MAC address - on bsdi, we see it a lot * since wildboar configures all-zero MAC on pccard before * card insertion. */ if (bcmp(addr, allzero, addrlen) == 0) return -1; if (bcmp(addr, allone, addrlen) == 0) return -1; /* make EUI64 address */ if (addrlen == 8) bcopy(addr, &in6->s6_addr[8], 8); else if (addrlen == 6) { in6->s6_addr[8] = addr[0]; in6->s6_addr[9] = addr[1]; in6->s6_addr[10] = addr[2]; in6->s6_addr[11] = 0xff; in6->s6_addr[12] = 0xfe; in6->s6_addr[13] = addr[3]; in6->s6_addr[14] = addr[4]; in6->s6_addr[15] = addr[5]; } break; case IFT_ARCNET: if (addrlen != 1) return -1; if (!addr[0]) return -1; bzero(&in6->s6_addr[8], 8); in6->s6_addr[15] = addr[0]; /* * due to insufficient bitwidth, we mark it local. */ in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ break; case IFT_GIF: #ifdef IFT_STF case IFT_STF: #endif /* * RFC2893 says: "SHOULD use IPv4 address as ifid source". * however, IPv4 address is not very suitable as unique * identifier source (can be renumbered). * we don't do this. */ return -1; default: return -1; } /* sanity check: g bit must not indicate "group" */ if (EUI64_GROUP(in6)) return -1; /* convert EUI64 into IPv6 interface identifier */ EUI64_TO_IFID(in6); /* * sanity check: ifid must not be all zero, avoid conflict with * subnet router anycast */ if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && bcmp(&in6->s6_addr[9], allzero, 7) == 0) { return -1; } return 0; } /* * Get interface identifier for the specified interface. If it is not * available on ifp0, borrow interface identifier from other information * sources. */ static int get_ifid(ifp0, altifp, in6) struct ifnet *ifp0; struct ifnet *altifp; /* secondary EUI64 source */ struct in6_addr *in6; { struct ifnet *ifp; /* first, try to get it from the interface itself */ - if (get_hw_ifid(ifp0, in6) == 0) { + if (in6_get_hw_ifid(ifp0, in6) == 0) { nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", if_name(ifp0))); goto success; } /* try secondary EUI64 source. this basically is for ATM PVC */ - if (altifp && get_hw_ifid(altifp, in6) == 0) { + if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", if_name(ifp0), if_name(altifp))); goto success; } /* next, try to get it from some other hardware interface */ IFNET_RLOCK(); for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { if (ifp == ifp0) continue; - if (get_hw_ifid(ifp, in6) != 0) + if (in6_get_hw_ifid(ifp, in6) != 0) continue; /* * to borrow ifid from other interface, ifid needs to be * globally unique */ if (IFID_UNIVERSAL(in6)) { nd6log((LOG_DEBUG, "%s: borrow interface identifier from %s\n", if_name(ifp0), if_name(ifp))); IFNET_RUNLOCK(); goto success; } } IFNET_RUNLOCK(); /* last resort: get from random number source */ if (get_rand_ifid(ifp, in6) == 0) { nd6log((LOG_DEBUG, "%s: interface identifier generated by random number\n", if_name(ifp0))); goto success; } printf("%s: failed to get interface identifier\n", if_name(ifp0)); return -1; success: nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], in6->s6_addr[14], in6->s6_addr[15])); return 0; } static int in6_ifattach_linklocal(ifp, altifp) struct ifnet *ifp; struct ifnet *altifp; /* secondary EUI64 source */ { struct in6_ifaddr *ia; struct in6_aliasreq ifra; struct nd_prefix pr0; int i, error; /* * configure link-local address. */ bzero(&ifra, sizeof(ifra)); /* * in6_update_ifa() does not use ifra_name, but we accurately set it * for safety. */ strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); ifra.ifra_addr.sin6_family = AF_INET6; ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; if ((ifp->if_flags & IFF_LOOPBACK) != 0) { ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); } else { if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { nd6log((LOG_ERR, "%s: no ifid available\n", if_name(ifp))); return (-1); } } if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) return (-1); ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); ifra.ifra_prefixmask.sin6_family = AF_INET6; ifra.ifra_prefixmask.sin6_addr = in6mask64; /* link-local addresses should NEVER expire. */ ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; /* * Do not let in6_update_ifa() do DAD, since we need a random delay * before sending an NS at the first time the interface becomes up. * Instead, in6_if_up() will start DAD with a proper random delay. */ ifra.ifra_flags |= IN6_IFF_NODAD; /* * Now call in6_update_ifa() to do a bunch of procedures to configure * a link-local address. We can set the 3rd argument to NULL, because * we know there's no other link-local address on the interface * and therefore we are adding one (instead of updating one). */ if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { /* * XXX: When the interface does not support IPv6, this call * would fail in the SIOCSIFADDR ioctl. I believe the * notification is rather confusing in this case, so just * suppress it. (jinmei@kame.net 20010130) */ if (error != EAFNOSUPPORT) nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " "configure a link-local address on %s " "(errno=%d)\n", if_name(ifp), error)); return (-1); } /* * Adjust ia6_flags so that in6_if_up will perform DAD. * XXX: Some P2P interfaces seem not to send packets just after * becoming up, so we skip p2p interfaces for safety. */ ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ #ifdef DIAGNOSTIC if (!ia) { panic("ia == NULL in in6_ifattach_linklocal"); /* NOTREACHED */ } #endif if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) { ia->ia6_flags &= ~IN6_IFF_NODAD; ia->ia6_flags |= IN6_IFF_TENTATIVE; } /* * Make the link-local prefix (fe80::%link/64) as on-link. * Since we'd like to manage prefixes separately from addresses, * we make an ND6 prefix structure for the link-local prefix, * and add it to the prefix list as a never-expire prefix. * XXX: this change might affect some existing code base... */ bzero(&pr0, sizeof(pr0)); pr0.ndpr_ifp = ifp; /* this should be 64 at this moment. */ pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; pr0.ndpr_prefix = ifra.ifra_addr; /* apply the mask for safety. (nd6_prelist_add will apply it again) */ for (i = 0; i < 4; i++) { pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= in6mask64.s6_addr32[i]; } /* * Initialize parameters. The link-local prefix must always be * on-link, and its lifetimes never expire. */ pr0.ndpr_raf_onlink = 1; pr0.ndpr_raf_auto = 1; /* probably meaningless */ pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; /* * Since there is no other link-local addresses, nd6_prefix_lookup() * probably returns NULL. However, we cannot always expect the result. * For example, if we first remove the (only) existing link-local * address, and then reconfigure another one, the prefix is still * valid with referring to the old link-local address. */ if (nd6_prefix_lookup(&pr0) == NULL) { if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) return (error); } return 0; } static int in6_ifattach_loopback(ifp) struct ifnet *ifp; /* must be IFT_LOOP */ { struct in6_aliasreq ifra; int error; bzero(&ifra, sizeof(ifra)); /* * in6_update_ifa() does not use ifra_name, but we accurately set it * for safety. */ strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); ifra.ifra_prefixmask.sin6_family = AF_INET6; ifra.ifra_prefixmask.sin6_addr = in6mask128; /* * Always initialize ia_dstaddr (= broadcast address) to loopback * address. Follows IPv4 practice - see in_ifinit(). */ ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); ifra.ifra_dstaddr.sin6_family = AF_INET6; ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); ifra.ifra_addr.sin6_family = AF_INET6; ifra.ifra_addr.sin6_addr = in6addr_loopback; /* the loopback address should NEVER expire. */ ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; /* we don't need to perform DAD on loopback interfaces. */ ifra.ifra_flags |= IN6_IFF_NODAD; /* skip registration to the prefix list. XXX should be temporary. */ ifra.ifra_flags |= IN6_IFF_NOPFX; /* * We are sure that this is a newly assigned address, so we can set * NULL to the 3rd arg. */ if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " "the loopback address on %s (errno=%d)\n", if_name(ifp), error)); return (-1); } return 0; } /* * compute NI group address, based on the current hostname setting. * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). * * when ifp == NULL, the caller is responsible for filling scopeid. */ int in6_nigroup(ifp, name, namelen, in6) struct ifnet *ifp; const char *name; int namelen; struct in6_addr *in6; { const char *p; u_char *q; MD5_CTX ctxt; u_int8_t digest[16]; char l; char n[64]; /* a single label must not exceed 63 chars */ if (!namelen || !name) return -1; p = name; while (p && *p && *p != '.' && p - name < namelen) p++; if (p - name > sizeof(n) - 1) return -1; /* label too long */ l = p - name; strncpy(n, name, l); n[(int)l] = '\0'; for (q = n; *q; q++) { if ('A' <= *q && *q <= 'Z') *q = *q - 'A' + 'a'; } /* generate 8 bytes of pseudo-random value. */ bzero(&ctxt, sizeof(ctxt)); MD5Init(&ctxt); MD5Update(&ctxt, &l, sizeof(l)); MD5Update(&ctxt, n, l); MD5Final(digest, &ctxt); bzero(in6, sizeof(*in6)); in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; in6->s6_addr8[11] = 2; bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); if (in6_setscope(in6, ifp, NULL)) return (-1); /* XXX: should not fail */ return 0; } /* * XXX multiple loopback interface needs more care. for instance, * nodelocal address needs to be configured onto only one of them. * XXX multiple link-local address case */ void in6_ifattach(ifp, altifp) struct ifnet *ifp; struct ifnet *altifp; /* secondary EUI64 source */ { struct in6_ifaddr *ia; struct in6_addr in6; /* some of the interfaces are inherently not IPv6 capable */ switch (ifp->if_type) { case IFT_PFLOG: case IFT_PFSYNC: case IFT_CARP: return; } /* * quirks based on interface type */ switch (ifp->if_type) { #ifdef IFT_STF case IFT_STF: /* * 6to4 interface is a very special kind of beast. * no multicast, no linklocal. RFC2529 specifies how to make * linklocals for 6to4 interface, but there's no use and * it is rather harmful to have one. */ goto statinit; #endif default: break; } /* * usually, we require multicast capability to the interface */ if ((ifp->if_flags & IFF_MULTICAST) == 0) { nd6log((LOG_INFO, "in6_ifattach: " "%s is not multicast capable, IPv6 not enabled\n", if_name(ifp))); return; } /* * assign loopback address for loopback interface. * XXX multiple loopback interface case. */ if ((ifp->if_flags & IFF_LOOPBACK) != 0) { in6 = in6addr_loopback; if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { if (in6_ifattach_loopback(ifp) != 0) return; } } /* * assign a link-local address, if there's none. */ if (ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) { ia = in6ifa_ifpforlinklocal(ifp, 0); if (ia == NULL) { if (in6_ifattach_linklocal(ifp, altifp) == 0) { /* linklocal address assigned */ } else { /* failed to assign linklocal address. bark? */ } } } #ifdef IFT_STF /* XXX */ statinit: #endif /* update dynamically. */ if (in6_maxmtu < ifp->if_mtu) in6_maxmtu = ifp->if_mtu; } /* * NOTE: in6_ifdetach() does not support loopback if at this moment. * We don't need this function in bsdi, because interfaces are never removed * from the ifnet list in bsdi. */ void in6_ifdetach(ifp) struct ifnet *ifp; { struct in6_ifaddr *ia, *oia; struct ifaddr *ifa, *next; struct rtentry *rt; short rtflags; struct sockaddr_in6 sin6; struct in6_multi *in6m; struct in6_multi *in6m_next; /* remove neighbor management table */ nd6_purge(ifp); /* nuke any of IPv6 addresses we have */ for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) { next = ifa->ifa_list.tqe_next; if (ifa->ifa_addr->sa_family != AF_INET6) continue; in6_purgeaddr(ifa); } /* undo everything done by in6_ifattach(), just in case */ for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) { next = ifa->ifa_list.tqe_next; if (ifa->ifa_addr->sa_family != AF_INET6 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { continue; } ia = (struct in6_ifaddr *)ifa; /* remove from the routing table */ if ((ia->ia_flags & IFA_ROUTE) && (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { rtflags = rt->rt_flags; rtfree(rt); rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, (struct sockaddr *)&ia->ia_addr, (struct sockaddr *)&ia->ia_prefixmask, rtflags, (struct rtentry **)0); } /* remove from the linked list */ TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); IFAFREE(&ia->ia_ifa); /* also remove from the IPv6 address chain(itojun&jinmei) */ oia = ia; if (oia == (ia = in6_ifaddr)) in6_ifaddr = ia->ia_next; else { while (ia->ia_next && (ia->ia_next != oia)) ia = ia->ia_next; if (ia->ia_next) ia->ia_next = oia->ia_next; else { nd6log((LOG_ERR, "%s: didn't unlink in6ifaddr from list\n", if_name(ifp))); } } IFAFREE(&oia->ia_ifa); } /* leave from all multicast groups joined */ if (udbinfo.listhead != NULL) in6_pcbpurgeif0(LIST_FIRST(udbinfo.listhead), ifp); if (ripcbinfo.listhead != NULL) in6_pcbpurgeif0(LIST_FIRST(ripcbinfo.listhead), ifp); for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) { in6m_next = LIST_NEXT(in6m, in6m_entry); if (in6m->in6m_ifp != ifp) continue; in6_delmulti(in6m); in6m = NULL; } /* * remove neighbor management table. we call it twice just to make * sure we nuke everything. maybe we need just one call. * XXX: since the first call did not release addresses, some prefixes * might remain. We should call nd6_purge() again to release the * prefixes after removing all addresses above. * (Or can we just delay calling nd6_purge until at this point?) */ nd6_purge(ifp); /* remove route to link-local allnodes multicast (ff02::1) */ bzero(&sin6, sizeof(sin6)); sin6.sin6_len = sizeof(struct sockaddr_in6); sin6.sin6_family = AF_INET6; sin6.sin6_addr = in6addr_linklocal_allnodes; if (in6_setscope(&sin6.sin6_addr, ifp, NULL)) /* XXX: should not fail */ return; /* XXX grab lock first to avoid LOR */ if (rt_tables[AF_INET6] != NULL) { RADIX_NODE_HEAD_LOCK(rt_tables[AF_INET6]); rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); if (rt) { if (rt->rt_ifp == ifp) rtexpunge(rt); RTFREE_LOCKED(rt); } RADIX_NODE_HEAD_UNLOCK(rt_tables[AF_INET6]); } } void in6_get_tmpifid(ifp, retbuf, baseid, generate) struct ifnet *ifp; u_int8_t *retbuf; const u_int8_t *baseid; int generate; { u_int8_t nullbuf[8]; struct nd_ifinfo *ndi = ND_IFINFO(ifp); bzero(nullbuf, sizeof(nullbuf)); if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { /* we've never created a random ID. Create a new one. */ generate = 1; } if (generate) { bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); /* generate_tmp_ifid will update seedn and buf */ (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, ndi->randomid); } bcopy(ndi->randomid, retbuf, 8); } void in6_tmpaddrtimer(ignored_arg) void *ignored_arg; { struct nd_ifinfo *ndi; u_int8_t nullbuf[8]; struct ifnet *ifp; int s = splnet(); callout_reset(&in6_tmpaddrtimer_ch, (ip6_temp_preferred_lifetime - ip6_desync_factor - ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL); bzero(nullbuf, sizeof(nullbuf)); for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { ndi = ND_IFINFO(ifp); if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { /* * We've been generating a random ID on this interface. * Create a new one. */ (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, ndi->randomid); } } splx(s); } Index: head/sys/netinet6/in6_ifattach.h =================================================================== --- head/sys/netinet6/in6_ifattach.h (revision 151476) +++ head/sys/netinet6/in6_ifattach.h (revision 151477) @@ -1,44 +1,45 @@ /* $FreeBSD$ */ /* $KAME: in6_ifattach.h,v 1.14 2001/02/08 12:48:39 jinmei 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. */ #ifndef _NETINET6_IN6_IFATTACH_H_ #define _NETINET6_IN6_IFATTACH_H_ #ifdef _KERNEL void in6_ifattach __P((struct ifnet *, struct ifnet *)); void in6_ifdetach __P((struct ifnet *)); void in6_get_tmpifid __P((struct ifnet *, u_int8_t *, const u_int8_t *, int)); void in6_tmpaddrtimer __P((void *)); +int in6_get_hw_ifid __P((struct ifnet *, struct in6_addr *)); int in6_nigroup __P((struct ifnet *, const char *, int, struct in6_addr *)); #endif /* _KERNEL */ #endif /* _NETINET6_IN6_IFATTACH_H_ */ Index: head/sys/netinet6/nd6_nbr.c =================================================================== --- head/sys/netinet6/nd6_nbr.c (revision 151476) +++ head/sys/netinet6/nd6_nbr.c (revision 151477) @@ -1,1430 +1,1467 @@ /* $FreeBSD$ */ /* $KAME: nd6_nbr.c,v 1.86 2002/01/21 02:33:04 jinmei 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 "opt_inet.h" #include "opt_inet6.h" #include "opt_ipsec.h" #include "opt_carp.h" #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 #ifdef DEV_CARP #include #endif #include #define SDL(s) ((struct sockaddr_dl *)s) struct dadq; static struct dadq *nd6_dad_find __P((struct ifaddr *)); static void nd6_dad_starttimer __P((struct dadq *, int)); static void nd6_dad_stoptimer __P((struct dadq *)); static void nd6_dad_timer __P((struct ifaddr *)); static void nd6_dad_ns_output __P((struct dadq *, struct ifaddr *)); static void nd6_dad_ns_input __P((struct ifaddr *)); static void nd6_dad_na_input __P((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 */ /* * Input a Neighbor Solicitation Message. * * Based on RFC 2461 * Based on RFC 2462 (duplicate address detection) */ void nd6_ns_input(m, off, icmp6len) struct mbuf *m; int off, 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, tentative = 0; int tlladdr; union nd_opts ndopts; struct sockaddr_dl *proxydl = NULL; #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, icmp6len,); 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 != 255) { 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; } } 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 0 /* too much! */ ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &daddr6); if (ifa && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)) tlladdr = 0; else #endif 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" address on which DAD is being performed. */ /* (1) and (3) check. */ #ifdef DEV_CARP if (ifp->if_carp) ifa = carp_iamatch6(ifp->if_carp, &taddr6); if (ifa == NULL) ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); #else ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); #endif /* (2) check. */ if (ifa == NULL) { struct rtentry *rt; struct sockaddr_in6 tsin6; int need_proxy; bzero(&tsin6, sizeof tsin6); tsin6.sin6_len = sizeof(struct sockaddr_in6); tsin6.sin6_family = AF_INET6; tsin6.sin6_addr = taddr6; rt = rtalloc1((struct sockaddr *)&tsin6, 0, 0); need_proxy = (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 && rt->rt_gateway->sa_family == AF_LINK); if (rt) rtfree(rt); if (need_proxy) { /* * 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); } } } if (!ifa) { /* * We've got an NS packet, and we don't have that adddress * assigned for us. We MUST silently ignore it. * See RFC2461 7.2.3. */ goto freeit; } myaddr6 = *IFA_IN6(ifa); anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST; tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE; if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED) goto freeit; 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 tentative address. * * 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. */ if (tentative) { /* * 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; } /* * If the source address is unspecified address, entries must not * be created or updated. * It looks that sender is performing DAD. 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)) { struct in6_addr in6_all; in6_all = in6addr_linklocal_allnodes; if (in6_setscope(&in6_all, ifp, NULL) != 0) goto bad; nd6_na_output(ifp, &in6_all, &taddr6, ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0), tlladdr, (struct sockaddr *)proxydl); 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) | (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED, tlladdr, (struct sockaddr *)proxydl); freeit: m_freem(m); 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); } /* * 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) */ void nd6_ns_output(ifp, daddr6, taddr6, ln, dad) struct ifnet *ifp; const struct in6_addr *daddr6, *taddr6; struct llinfo_nd6 *ln; /* for source address determination */ int dad; /* duplicate address detection */ { struct mbuf *m; struct ip6_hdr *ip6; struct nd_neighbor_solicit *nd_ns; struct in6_addr *src, src_in; struct ip6_moptions im6o; int icmp6len; int maxlen; caddr_t mac; struct route_in6 ro; bzero(&ro, sizeof(ro)); if (IN6_IS_ADDR_MULTICAST(taddr6)) return; /* 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) { #ifdef 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); 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.im6o_multicast_ifp = ifp; im6o.im6o_multicast_hlim = 255; 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 = 255; 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; if (ln && ln->ln_hold) { /* * assuming every packet in ln_hold has the same IP * header */ 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; } if (hsrc && in6ifa_ifpwithaddr(ifp, hsrc)) 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, NULL, &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; } } } 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; } 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); ip6_output(m, NULL, &ro, dad ? IPV6_DADOUTPUT : 0, &im6o, NULL, NULL); icmp6_ifstat_inc(ifp, ifs6_out_msg); icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit); icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++; if (ro.ro_rt) { /* we don't cache this route. */ RTFREE(ro.ro_rt); } return; bad: if (ro.ro_rt) { RTFREE(ro.ro_rt); } m_freem(m); 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(m, off, icmp6len) struct mbuf *m; int off, 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 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; struct llinfo_nd6 *ln; struct rtentry *rt; struct sockaddr_dl *sdl; union nd_opts ndopts; if (ip6->ip6_hlim != 255) { 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,); 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, this means that there's somebody * already using the same address as mine. This indicates DAD failure. * This is defined in RFC 2462. * * Otherwise, process as defined in RFC 2461. */ if (ifa && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) { nd6_dad_na_input(ifa); goto freeit; } /* 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; } /* * If no neighbor cache entry is found, NA SHOULD silently be * discarded. */ rt = nd6_lookup(&taddr6, 0, ifp); if ((rt == NULL) || ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) || ((sdl = SDL(rt->rt_gateway)) == NULL)) goto freeit; 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 == NULL) 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) { ln->ln_expire = time_second + ND_IFINFO(rt->rt_ifp)->reachable; } } else { ln->ln_state = ND6_LLINFO_STALE; ln->ln_expire = time_second + 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.. */ pfxlist_onlink_check(); } } else { int llchange; /* * Check if the link-layer address has changed or not. */ if (lladdr == NULL) 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 = time_second + nd6_gctimer; } goto freeit; } else if (is_override /* (2a) */ || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */ || lladdr == NULL) { /* (2c) */ /* * Update link-local address, if any. */ if (lladdr != NULL) { 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) { ln->ln_expire = time_second + ND_IFINFO(ifp)->reachable; } } else { if (lladdr != NULL && llchange) { ln->ln_state = ND6_LLINFO_STALE; ln->ln_expire = time_second + 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; int s; in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr; /* * Lock to protect the default router list. * XXX: this might be unnecessary, since this function * is only called under the network software interrupt * context. However, we keep it just for safety. */ s = splnet(); dr = defrouter_lookup(in6, ifp); if (dr) defrtrlist_del(dr); else if (!ip6_forwarding && ip6_accept_rtadv) { /* * 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, ifp); } splx(s); } ln->ln_router = is_router; } rt->rt_flags &= ~RTF_REJECT; ln->ln_asked = 0; if (ln->ln_hold) { /* * we assume ifp is not a loopback here, so just set the 2nd * argument as the 1st one. */ nd6_output(ifp, ifp, ln->ln_hold, (struct sockaddr_in6 *)rt_key(rt), rt); ln->ln_hold = NULL; } freeit: m_freem(m); return; bad: icmp6stat.icp6s_badna++; m_freem(m); } /* * 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) */ void nd6_na_output(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0) struct ifnet *ifp; const struct in6_addr *daddr6_0, *taddr6; u_long 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; struct in6_addr *src, daddr6; struct sockaddr_in6 dst_sa; int icmp6len, maxlen, error; caddr_t mac = NULL; struct route_in6 ro; bzero(&ro, sizeof(ro)); daddr6 = *daddr6_0; /* make a local copy for modification */ /* 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) { #ifdef 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); 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.im6o_multicast_ifp = ifp; im6o.im6o_multicast_hlim = 255; 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 = 255; if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) { /* reply to DAD */ 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] = 0; ip6->ip6_dst.s6_addr32[3] = IPV6_ADDR_INT32_ONE; if (in6_setscope(&daddr6, ifp, NULL)) goto bad; flags &= ~ND_NA_FLAG_SOLICITED; } 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, NULL, &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; 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) { #ifdef DEV_CARP if (ifp->if_carp) mac = carp_macmatch6(ifp->if_carp, m, taddr6); if (mac == NULL) mac = nd6_ifptomac(ifp); #else mac = nd6_ifptomac(ifp); #endif } else if (sdl0->sa_family == AF_LINK) { struct sockaddr_dl *sdl; sdl = (struct sockaddr_dl *)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); ip6_output(m, NULL, &ro, 0, &im6o, NULL, NULL); icmp6_ifstat_inc(ifp, ifs6_out_msg); icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert); icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++; if (ro.ro_rt) { /* we don't cache this route. */ RTFREE(ro.ro_rt); } return; bad: if (ro.ro_rt) { RTFREE(ro.ro_rt); } m_freem(m); return; } caddr_t nd6_ifptomac(ifp) struct ifnet *ifp; { switch (ifp->if_type) { case IFT_ARCNET: case IFT_ETHER: 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 IF_LLADDR(ifp); default: return NULL; } } TAILQ_HEAD(dadq_head, dadq); struct dadq { 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; struct callout dad_timer_ch; }; static struct dadq_head dadq; static int dad_init = 0; static struct dadq * nd6_dad_find(ifa) struct ifaddr *ifa; { struct dadq *dp; for (dp = dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) { if (dp->dad_ifa == ifa) return dp; } return NULL; } static void nd6_dad_starttimer(dp, ticks) struct dadq *dp; int ticks; { callout_reset(&dp->dad_timer_ch, ticks, (void (*) __P((void *)))nd6_dad_timer, (void *)dp->dad_ifa); } static void nd6_dad_stoptimer(dp) struct dadq *dp; { callout_stop(&dp->dad_timer_ch); } /* * Start Duplicate Address Detection (DAD) for specified interface address. */ void nd6_dad_start(ifa, tick) struct ifaddr *ifa; int *tick; /* minimum delay ticks for IFF_UP event */ { struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; struct dadq *dp; if (!dad_init) { TAILQ_INIT(&dadq); dad_init++; } /* * 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 */ if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) { log(LOG_DEBUG, "nd6_dad_start: called with non-tentative address " "%s(%s)\n", ip6_sprintf(&ia->ia_addr.sin6_addr), ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); return; } if (ia->ia6_flags & IN6_IFF_ANYCAST) { ia->ia6_flags &= ~IN6_IFF_TENTATIVE; return; } if (!ip6_dad_count) { ia->ia6_flags &= ~IN6_IFF_TENTATIVE; return; } if (ifa->ifa_ifp == NULL) panic("nd6_dad_start: ifa->ifa_ifp == NULL"); if (!(ifa->ifa_ifp->if_flags & IFF_UP)) { return; } if (nd6_dad_find(ifa) != NULL) { /* DAD already in progress */ return; } dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT); 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, sizeof(*dp)); callout_init(&dp->dad_timer_ch, 0); TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list); nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp), 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. */ dp->dad_ifa = ifa; IFAREF(ifa); /* just for safety */ dp->dad_count = ip6_dad_count; dp->dad_ns_icount = dp->dad_na_icount = 0; dp->dad_ns_ocount = dp->dad_ns_tcount = 0; if (tick == NULL) { nd6_dad_ns_output(dp, ifa); nd6_dad_starttimer(dp, ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); } else { int ntick; if (*tick == 0) ntick = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); else ntick = *tick + arc4random() % (hz / 2); *tick = ntick; nd6_dad_starttimer(dp, ntick); } } /* * terminate DAD unconditionally. used for address removals. */ void nd6_dad_stop(ifa) struct ifaddr *ifa; { struct dadq *dp; if (!dad_init) return; dp = nd6_dad_find(ifa); if (!dp) { /* DAD wasn't started yet */ return; } nd6_dad_stoptimer(dp); TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); free(dp, M_IP6NDP); dp = NULL; IFAFREE(ifa); } static void nd6_dad_timer(ifa) struct ifaddr *ifa; { int s; struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; struct dadq *dp; s = splnet(); /* XXX */ /* 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; } 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) : "???"); goto done; } if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) { log(LOG_ERR, "nd6_dad_timer: called with non-tentative address " "%s(%s)\n", ip6_sprintf(&ia->ia_addr.sin6_addr), ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); goto done; } /* timeouted with IFF_{RUNNING,UP} check */ if (dp->dad_ns_tcount > dad_maxtry) { nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n", if_name(ifa->ifa_ifp))); TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); free(dp, M_IP6NDP); dp = NULL; IFAFREE(ifa); goto done; } /* Need more checks? */ if (dp->dad_ns_ocount < dp->dad_count) { /* * We have more NS to go. Send NS packet for DAD. */ nd6_dad_ns_output(dp, ifa); nd6_dad_starttimer(dp, ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); } 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++; } if (duplicate) { /* (*dp) will be freed in nd6_dad_duplicated() */ dp = NULL; nd6_dad_duplicated(ifa); } else { /* * We are done with DAD. No NA came, no NS came. * No duplicate address found. */ ia->ia6_flags &= ~IN6_IFF_TENTATIVE; nd6log((LOG_DEBUG, "%s: DAD complete for %s - no duplicates found\n", if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr))); TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); free(dp, M_IP6NDP); dp = NULL; IFAFREE(ifa); } } done: splx(s); } void nd6_dad_duplicated(ifa) struct ifaddr *ifa; { struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; + struct ifnet *ifp; struct dadq *dp; dp = nd6_dad_find(ifa); if (dp == NULL) { log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n"); return; } log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: " "NS in/out=%d/%d, NA in=%d\n", if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr), dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount); ia->ia6_flags &= ~IN6_IFF_TENTATIVE; ia->ia6_flags |= IN6_IFF_DUPLICATED; /* We are done with DAD, with duplicate address found. (failure) */ nd6_dad_stoptimer(dp); + ifp = ifa->ifa_ifp; log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n", - if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr)); + if_name(ifp), ip6_sprintf(&ia->ia_addr.sin6_addr)); log(LOG_ERR, "%s: manual intervention required\n", - if_name(ifa->ifa_ifp)); + if_name(ifp)); + + /* + * 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. + * [rfc2462bis-03 Section 5.4.5] + */ + if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) { + struct in6_addr in6; + + /* + * 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_ETHER: + case IFT_FDDI: + case IFT_ATM: + case IFT_IEEE1394: +#ifdef IFT_IEEE80211 + case IFT_IEEE80211: +#endif + in6 = ia->ia_addr.sin6_addr; + if (in6_get_hw_ifid(ifp, &in6) == 0 && + IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) { + ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED; + log(LOG_ERR, "%s: possible hardware address " + "duplication detected, disable IPv6\n", + if_name(ifp)); + } + break; + } + } TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); free(dp, M_IP6NDP); dp = NULL; IFAFREE(ifa); } static void nd6_dad_ns_output(dp, ifa) struct dadq *dp; struct ifaddr *ifa; { struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; struct ifnet *ifp = ifa->ifa_ifp; dp->dad_ns_tcount++; if ((ifp->if_flags & IFF_UP) == 0) { #if 0 printf("%s: interface down?\n", if_name(ifp)); #endif return; } if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { #if 0 printf("%s: interface not running?\n", if_name(ifp)); #endif return; } dp->dad_ns_ocount++; nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1); } static void nd6_dad_ns_input(ifa) struct ifaddr *ifa; { struct in6_ifaddr *ia; struct ifnet *ifp; const struct in6_addr *taddr6; struct dadq *dp; int duplicate; if (ifa == NULL) panic("ifa == NULL in nd6_dad_ns_input"); ia = (struct in6_ifaddr *)ifa; ifp = ifa->ifa_ifp; taddr6 = &ia->ia_addr.sin6_addr; duplicate = 0; dp = nd6_dad_find(ifa); /* Quickhack - completely ignore DAD NS packets */ if (dad_ignore_ns) { nd6log((LOG_INFO, "nd6_dad_ns_input: ignoring DAD NS packet for " "address %s(%s)\n", ip6_sprintf(taddr6), if_name(ifa->ifa_ifp))); 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 || dp->dad_ns_ocount == 0) duplicate++; /* XXX more checks for loopback situation - see nd6_dad_timer too */ if (duplicate) { dp = NULL; /* will be freed in nd6_dad_duplicated() */ nd6_dad_duplicated(ifa); } else { /* * not sure if I got a duplicate. * increment ns count and see what happens. */ if (dp) dp->dad_ns_icount++; } } static void nd6_dad_na_input(ifa) struct ifaddr *ifa; { struct dadq *dp; if (ifa == NULL) panic("ifa == NULL in nd6_dad_na_input"); dp = nd6_dad_find(ifa); if (dp) dp->dad_na_icount++; /* remove the address. */ nd6_dad_duplicated(ifa); }