/* $FreeBSD: src/sys/netinet6/in6_ifattach.c,v 1.2.2.6 2002/04/28 05:40:26 suz Exp $ */ /* $DragonFly: src/sys/netinet6/in6_ifattach.c,v 1.14 2006/01/14 11:44:25 swildner Exp $ */ /* $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 #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 (struct ifnet *, struct in6_addr *); static int generate_tmp_ifid (u_int8_t *, const u_int8_t *, u_int8_t *); static int get_hw_ifid (struct ifnet *, struct in6_addr *); static int get_ifid (struct ifnet *, struct ifnet *, struct in6_addr *); static int in6_ifattach_linklocal (struct ifnet *, struct ifnet *); static int in6_ifattach_loopback (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(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(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) { MD5_CTX ctxt; u_int8_t seed[16], digest[16], nullbuf[8]; u_int32_t val32; struct timeval tv; /* 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++) { microtime(&tv); val32 = random() ^ tv.tv_usec; 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) { log(LOG_INFO, "generate_tmp_ifid: computed MD5 value is zero.\n"); microtime(&tv); val32 = random() ^ tv.tv_usec; 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(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 }; TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 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_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(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) { 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) { 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 */ TAILQ_FOREACH(ifp, &ifnet, if_list) { if (ifp == ifp0) continue; if (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))); goto success; } } /* 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(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_addr16[0] = htons(0xfe80); ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */ 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; } } 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 NULL to the 3rd argument, 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 * supress it. (jinmei@kame.net 20010130) */ if (error != EAFNOSUPPORT) log(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::/64%link) 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(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) { log(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(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] = htons(0xff02); if (ifp) in6->s6_addr16[1] = htons(ifp->if_index); in6->s6_addr8[11] = 2; bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); return 0; } void in6_nigroup_attach(const char *name, int namelen) { struct ifnet *ifp; struct sockaddr_in6 mltaddr; struct in6_multi *in6m; int error; bzero(&mltaddr, sizeof(mltaddr)); mltaddr.sin6_family = AF_INET6; mltaddr.sin6_len = sizeof(struct sockaddr_in6); if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) return; TAILQ_FOREACH(ifp, &ifnet, if_list) { mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); if (!in6m) { if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error)) { nd6log((LOG_ERR, "%s: failed to join %s " "(errno=%d)\n", if_name(ifp), ip6_sprintf(&mltaddr.sin6_addr), error)); } } } } void in6_nigroup_detach(const char *name, int namelen) { struct ifnet *ifp; struct sockaddr_in6 mltaddr; struct in6_multi *in6m; bzero(&mltaddr, sizeof(mltaddr)); mltaddr.sin6_family = AF_INET6; mltaddr.sin6_len = sizeof(struct sockaddr_in6); if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) return; TAILQ_FOREACH(ifp, &ifnet, if_list) { mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); if (in6m) in6_delmulti(in6m); } } /* * 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(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) { #ifdef IFT_BRIDGE /*OpenBSD 2.8*/ case IFT_BRIDGE: return; #endif case IFT_PFLOG: case IFT_PFSYNC: 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) { log(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) { 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(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; /* nuke prefix list. this may try to remove some of ifaddrs as well */ in6_purgeprefix(ifp); /* remove neighbor management table */ nd6_purge(ifp); /* nuke any of IPv6 addresses we have */ TAILQ_FOREACH_MUTABLE(ifa, &ifp->if_addrlist, ifa_list, next) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; in6_purgeaddr(ifa); } /* undo everything done by in6_ifattach(), just in case */ TAILQ_FOREACH_MUTABLE(ifa, &ifp->if_addrlist, ifa_list, 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 = rtpurelookup((struct sockaddr *)&ia->ia_addr))) { rtflags = rt->rt_flags; --rt->rt_refcnt; 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 */ in6_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); in6_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), 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; sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); rt = rtpurelookup((struct sockaddr *)&sin6); if (rt != NULL && rt->rt_ifp == ifp) { --rt->rt_refcnt; rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); } } void in6_get_tmpifid(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 */ generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, ndi->randomid); } bcopy(ndi->randomid, retbuf, 8); } void in6_tmpaddrtimer(void *ignored_arg) { struct nd_ifinfo *ndi; u_int8_t nullbuf[8]; struct ifnet *ifp; crit_enter(); 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. */ generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, ndi->randomid); } } crit_exit(); }