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Diffstat (limited to 'sys/netinet6/in6_ifattach.c')
| -rw-r--r-- | sys/netinet6/in6_ifattach.c | 1050 |
1 files changed, 1050 insertions, 0 deletions
diff --git a/sys/netinet6/in6_ifattach.c b/sys/netinet6/in6_ifattach.c new file mode 100644 index 0000000..5abcca1 --- /dev/null +++ b/sys/netinet6/in6_ifattach.c @@ -0,0 +1,1050 @@ +/* $FreeBSD$ */ +/* $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 <sys/param.h> +#include <sys/systm.h> +#include <sys/malloc.h> +#include <sys/socket.h> +#include <sys/sockio.h> +#include <sys/kernel.h> +#include <sys/syslog.h> +#include <sys/md5.h> + +#include <net/if.h> +#include <net/if_dl.h> +#include <net/if_types.h> +#include <net/route.h> + +#include <netinet/in.h> +#include <netinet/in_var.h> +#include <netinet/if_ether.h> +#include <netinet/in_pcb.h> + +#include <netinet/ip6.h> +#include <netinet6/ip6_var.h> +#include <netinet6/in6_var.h> +#include <netinet6/in6_pcb.h> +#include <netinet6/in6_ifattach.h> +#include <netinet6/ip6_var.h> +#include <netinet6/nd6.h> +#include <netinet6/scope6_var.h> + +#include <net/net_osdep.h> + +struct in6_ifstat **in6_ifstat = NULL; +struct icmp6_ifstat **icmp6_ifstat = NULL; +size_t in6_ifstatmax = 0; +size_t icmp6_ifstatmax = 0; +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; + 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(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_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) { + 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 */ + 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) + 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_addr16[0] = htons(0xfe80); +#ifdef SCOPEDROUTING + ifra.ifra_addr.sin6_addr.s6_addr16[1] = 0 +#else + ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */ +#endif + 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; + } + } +#ifdef SCOPEDROUTING + ifra.ifra_addr.sin6_scope_id = + in6_addr2scopeid(ifp, &ifra.ifra_addr.sin6_addr); +#endif + + ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); + ifra.ifra_prefixmask.sin6_family = AF_INET6; + ifra.ifra_prefixmask.sin6_addr = in6mask64; +#ifdef SCOPEDROUTING + /* take into accound the sin6_scope_id field for routing */ + ifra.ifra_prefixmask.sin6_scope_id = 0xffffffff; +#endif + /* 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(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) { + 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(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] = 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(name, namelen) + 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; + + IFNET_RLOCK(); + for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) + { + 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)); + } + } + } + IFNET_RUNLOCK(); +} + +void +in6_nigroup_detach(name, namelen) + 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; + + IFNET_RLOCK(); + for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) + { + mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); + IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); + if (in6m) + in6_delmulti(in6m); + } + IFNET_RUNLOCK(); +} + +/* + * 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 */ +{ + static size_t if_indexlim = 8; + 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 + } + + /* + * We have some arrays that should be indexed by if_index. + * since if_index will grow dynamically, they should grow too. + * struct in6_ifstat **in6_ifstat + * struct icmp6_ifstat **icmp6_ifstat + */ + if (in6_ifstat == NULL || icmp6_ifstat == NULL || + if_index >= if_indexlim) { + size_t n; + caddr_t q; + size_t olim; + + olim = if_indexlim; + while (if_index >= if_indexlim) + if_indexlim <<= 1; + + /* grow in6_ifstat */ + n = if_indexlim * sizeof(struct in6_ifstat *); + q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK); + bzero(q, n); + if (in6_ifstat) { + bcopy((caddr_t)in6_ifstat, q, + olim * sizeof(struct in6_ifstat *)); + free((caddr_t)in6_ifstat, M_IFADDR); + } + in6_ifstat = (struct in6_ifstat **)q; + in6_ifstatmax = if_indexlim; + + /* grow icmp6_ifstat */ + n = if_indexlim * sizeof(struct icmp6_ifstat *); + q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK); + bzero(q, n); + if (icmp6_ifstat) { + bcopy((caddr_t)icmp6_ifstat, q, + olim * sizeof(struct icmp6_ifstat *)); + free((caddr_t)icmp6_ifstat, M_IFADDR); + } + icmp6_ifstat = (struct icmp6_ifstat **)q; + icmp6_ifstatmax = if_indexlim; + } + + /* initialize scope identifiers */ + scope6_ifattach(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. + */ + 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; + + if (in6_ifstat[ifp->if_index] == NULL) { + in6_ifstat[ifp->if_index] = (struct in6_ifstat *) + malloc(sizeof(struct in6_ifstat), M_IFADDR, M_WAITOK); + bzero(in6_ifstat[ifp->if_index], sizeof(struct in6_ifstat)); + } + if (icmp6_ifstat[ifp->if_index] == NULL) { + icmp6_ifstat[ifp->if_index] = (struct icmp6_ifstat *) + malloc(sizeof(struct icmp6_ifstat), M_IFADDR, M_WAITOK); + bzero(icmp6_ifstat[ifp->if_index], sizeof(struct icmp6_ifstat)); + } + + /* initialize NDP variables */ + nd6_ifattach(ifp); +} + +/* + * 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; + + /* 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 */ + 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 */ + in6_pcbpurgeif0(LIST_FIRST(udbinfo.listhead), ifp); + 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; + sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); + rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); + if (rt && rt->rt_ifp == ifp) { + rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), + rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); + rtfree(rt); + } +} + +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->if_index]; + + 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; +{ + int i; + struct nd_ifinfo *ndi; + u_int8_t nullbuf[8]; + 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 (i = 1; i < if_index + 1; i++) { + ndi = &nd_ifinfo[i]; + 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); +} |
