/* $NetBSD: in6_ifattach.c,v 1.73 2007/08/10 22:43:26 dyoung Exp $ */ /* $KAME: in6_ifattach.c,v 1.124 2001/07/18 08:32:51 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 __KERNEL_RCSID(0, "$NetBSD: in6_ifattach.c,v 1.73 2007/08/10 22:43:26 dyoung Exp $"); #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; int ip6_auto_linklocal = 1; /* enable by default */ callout_t in6_tmpaddrtimer_ch; #if 0 static int get_hostid_ifid __P((struct ifnet *, struct in6_addr *)); #endif 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_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 (/*CONSTCOND*/ 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)) #define GEN_TEMPID_RETRY_MAX 5 #if 0 /* * Generate a last-resort interface identifier from hostid. * works only for certain architectures (like sparc). * also, using hostid itself may constitute a privacy threat, much worse * than MAC addresses (hostids are used for software licensing). * maybe we should use MD5(hostid) instead. * * in6 - upper 64bits are preserved */ static int get_hostid_ifid(struct ifnet *ifp, struct in6_addr *in6) { int off, len; static const uint8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; static const uint8_t allone[8] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; if (!hostid) return -1; /* get up to 8 bytes from the hostid field - should we get */ len = (sizeof(hostid) > 8) ? 8 : sizeof(hostid); off = sizeof(*in6) - len; memcpy(&in6->s6_addr[off], &hostid, len); /* make sure we do not return anything bogus */ if (memcmp(&in6->s6_addr[8], allzero, sizeof(allzero))) return -1; if (memcmp(&in6->s6_addr[8], allone, sizeof(allone))) return -1; /* 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; } #endif /* * 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]; #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. */ memset(&ctxt, 0, sizeof(ctxt)); MD5Init(&ctxt); MD5Update(&ctxt, (u_char *)hostname, hostnamelen); MD5Final(digest, &ctxt); /* assumes sizeof(digest) > sizeof(ifid) */ memcpy(&in6->s6_addr[8], digest, 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; /* * interface ID for subnet anycast addresses. * XXX: we assume the unicast address range that requires IDs * in EUI-64 format. */ static const uint8_t anycast_id[8] = { 0xfd, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80 }; static const uint8_t isatap_id[4] = { 0x00, 0x00, 0x5e, 0xfe }; int badid, retry = 0; /* If there's no hisotry, start with a random seed. */ memset(nullbuf, 0, sizeof(nullbuf)); if (memcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { int i; for (i = 0; i < 2; i++) { val32 = arc4random(); memcpy(seed + sizeof(val32) * i, &val32, sizeof(val32)); } } else memcpy(seed, seed0, 8); /* copy the right-most 64-bits of the given address */ /* XXX assumption on the size of IFID */ memcpy(&seed[8], seed1, 8); again: /* for debugging purposes only */ #if 0 { int i; printf("generate_tmp_ifid: new randomized ID from: "); for (i = 0; i < 16; i++) printf("%02x", seed[i]); printf(" "); } #endif /* generate 16 bytes of pseudo-random value. */ memset(&ctxt, 0, sizeof(ctxt)); MD5Init(&ctxt); MD5Update(&ctxt, seed, sizeof(seed)); MD5Final(digest, &ctxt); /* * draft-ietf-ipngwg-temp-addresses-v2-00.txt 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. */ memcpy(ret, digest, 8); ret[0] &= ~EUI64_UBIT; /* * Reject inappropriate identifiers according to * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (4) * At this moment, we reject following cases: * - all 0 identifier * - identifiers that conflict with reserved subnet anycast addresses, * which are defined in RFC 2526. * - identifiers that conflict with ISATAP addresses * - identifiers used in our own addresses */ badid = 0; if (memcmp(nullbuf, ret, sizeof(nullbuf)) == 0) badid = 1; else if (memcmp(anycast_id, ret, 7) == 0 && (anycast_id[7] & ret[7]) == anycast_id[7]) { badid = 1; } else if (memcmp(isatap_id, ret, sizeof(isatap_id)) == 0) badid = 1; else { struct in6_ifaddr *ia; for (ia = in6_ifaddr; ia; ia = ia->ia_next) { if (!memcmp(&ia->ia_addr.sin6_addr.s6_addr[8], ret, 8)) { badid = 1; break; } } } /* * In the event that an unacceptable identifier has been generated, * restart the process, using the right-most 64 bits of the MD5 digest * obtained in place of the history value. */ if (badid) { /* for debugging purposes only */ #if 0 { int i; printf("unacceptable random ID: "); for (i = 0; i < 16; i++) printf("%02x", digest[i]); printf("\n"); } #endif if (++retry < GEN_TEMPID_RETRY_MAX) { memcpy(seed, &digest[8], 8); goto again; } else { /* * We're so unlucky. Give up for now, and return * all 0 IDs to tell the caller not to make a * temporary address. */ nd6log((LOG_NOTICE, "generate_tmp_ifid: never found a good ID\n")); memset(ret, 0, 8); } } /* * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (6) * 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. */ memcpy(seed0, &digest[8], 8); /* for debugging purposes only */ #if 0 { int i; printf("to: "); for (i = 0; i < 16; i++) printf("%02x", digest[i]); printf("\n"); } #endif return 0; } /* * Get interface identifier for the specified interface. * XXX assumes single sockaddr_dl (AF_LINK address) per an interfacea * * in6 - upper 64bits are preserved */ int in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) { struct ifaddr *ifa; const struct sockaddr_dl *sdl; const char *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 = satocsdl(ifa->ifa_addr); if (sdl == NULL) continue; if (sdl->sdl_alen == 0) continue; goto found; } return -1; found: addr = CLLADDR(sdl); addrlen = sdl->sdl_alen; switch (ifp->if_type) { case IFT_IEEE1394: case IFT_IEEE80211: /* IEEE1394 uses 16byte length address starting with EUI64 */ if (addrlen > 8) addrlen = 8; break; default: break; } /* get EUI64 */ switch (ifp->if_type) { /* IEEE802/EUI64 cases - what others? */ case IFT_ETHER: case IFT_FDDI: case IFT_ATM: case IFT_IEEE1394: case IFT_IEEE80211: /* 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 (memcmp(addr, allzero, addrlen) == 0) return -1; if (memcmp(addr, allone, addrlen) == 0) return -1; /* make EUI64 address */ if (addrlen == 8) memcpy(&in6->s6_addr[8], addr, 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; memset(&in6->s6_addr[8], 0, 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 && memcmp(&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. * * altifp - secondary EUI64 source */ static int get_ifid(struct ifnet *ifp0, struct ifnet *altifp, struct in6_addr *in6) { struct ifnet *ifp; /* first, try to get it from the interface itself */ 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 && 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 */ TAILQ_FOREACH(ifp, &ifnet, if_list) { if (ifp == ifp0) continue; 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))); goto success; } } #if 0 /* get from hostid - only for certain architectures */ if (get_hostid_ifid(ifp, in6) == 0) { nd6log((LOG_DEBUG, "%s: interface identifier generated by hostid\n", if_name(ifp0))); goto success; } #endif /* 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; } /* * altifp - secondary EUI64 source */ static int in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) { struct in6_ifaddr *ia; struct in6_aliasreq ifra; struct nd_prefixctl pr0; int i, error; /* * configure link-local address. */ memset(&ifra, 0, 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; /* * 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, IN6_IFAUPDATE_DADDELAY)) != 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; } ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ #ifdef DIAGNOSTIC if (!ia) { panic("ia == NULL in in6_ifattach_linklocal"); /* NOTREACHED */ } #endif /* * 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... */ memset(&pr0, 0, 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_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; } /* * ifp - mut be IFT_LOOP */ static int in6_ifattach_loopback(struct ifnet *ifp) { struct in6_aliasreq ifra; int error; memset(&ifra, 0, 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; /* * 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)) != 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(struct ifnet *ifp, const char *name, int namelen, struct sockaddr_in6 *sa6) { const char *p; u_int8_t *q; MD5_CTX ctxt; u_int8_t digest[16]; u_int8_t l; u_int8_t 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((char *)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. */ memset(&ctxt, 0, sizeof(ctxt)); MD5Init(&ctxt); MD5Update(&ctxt, &l, sizeof(l)); MD5Update(&ctxt, n, l); MD5Final(digest, &ctxt); memset(sa6, 0, sizeof(*sa6)); sa6->sin6_family = AF_INET6; sa6->sin6_len = sizeof(*sa6); sa6->sin6_addr.s6_addr16[0] = htons(0xff02); sa6->sin6_addr.s6_addr8[11] = 2; memcpy(&sa6->sin6_addr.s6_addr32[3], digest, sizeof(sa6->sin6_addr.s6_addr32[3])); if (in6_setscope(&sa6->sin6_addr, 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 * * altifp - secondary EUI64 source */ void in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) { struct in6_ifaddr *ia; struct in6_addr in6; /* some of the interfaces are inherently not IPv6 capable */ switch (ifp->if_type) { case IFT_BRIDGE: #ifdef IFT_PFLOG case IFT_PFLOG: #endif #ifdef IFT_PFSYNC case IFT_PFSYNC: #endif return; } /* * if link mtu is too small, don't try to configure IPv6. * remember there could be some link-layer that has special * fragmentation logic. */ if (ifp->if_mtu < IPV6_MMTU) { nd6log((LOG_INFO, "in6_ifattach: " "%s has too small MTU, IPv6 not enabled\n", if_name(ifp))); return; } /* create a multicast kludge storage (if we have not had one) */ in6_createmkludge(ifp); /* * 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. */ return; #endif case IFT_CARP: return; 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) { ia = in6ifa_ifpforlinklocal(ifp, 0); if (ia == NULL && in6_ifattach_linklocal(ifp, altifp) != 0) { printf("%s: cannot assign link-local address\n", ifp->if_xname); } } } /* * 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 in6_multi_mship *imm; /* remove ip6_mrouter stuff */ ip6_mrouter_detach(ifp); /* remove neighbor management table */ nd6_purge(ifp); /* nuke any of IPv6 addresses we have */ for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa; ifa = next) { next = TAILQ_NEXT(ifa, ifa_list); if (ifa->ifa_addr->sa_family != AF_INET6) continue; in6_purgeaddr(ifa); } /* undo everything done by in6_ifattach(), just in case */ for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa; ifa = next) { next = TAILQ_NEXT(ifa, ifa_list); if (ifa->ifa_addr->sa_family != AF_INET6 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { continue; } ia = (struct in6_ifaddr *)ifa; /* * leave from multicast groups we have joined for the interface */ while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { LIST_REMOVE(imm, i6mm_chain); in6_leavegroup(imm); } /* remove from the routing table */ if ((ia->ia_flags & IFA_ROUTE) && (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0))) { 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, &ia->ia_ifa, 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); } /* cleanup multicast address kludge table, if there is any */ in6_purgemkludge(ifp); /* * 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); } int 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); memset(nullbuf, 0, sizeof(nullbuf)); if (memcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { /* we've never created a random ID. Create a new one. */ generate = 1; } if (generate) { memcpy(ndi->randomseed1, baseid, sizeof(ndi->randomseed1)); /* generate_tmp_ifid will update seedn and buf */ (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, ndi->randomid); } memcpy(retbuf, ndi->randomid, 8); if (generate && memcmp(retbuf, nullbuf, sizeof(nullbuf)) == 0) { /* generate_tmp_ifid could not found a good ID. */ return -1; } return 0; } void in6_tmpaddrtimer(void *ignored_arg) { struct nd_ifinfo *ndi; u_int8_t nullbuf[8]; struct ifnet *ifp; int s = splsoftnet(); callout_reset(&in6_tmpaddrtimer_ch, (ip6_temp_preferred_lifetime - ip6_desync_factor - ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL); memset(nullbuf, 0, sizeof(nullbuf)); TAILQ_FOREACH(ifp, &ifnet, if_list) { ndi = ND_IFINFO(ifp); if (memcmp(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); }