X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/1c79356b52d46aa6b508fb032f5ae709b1f2897b..cb3231590a3c94ab4375e2228bd5e86b0cf1ad7e:/bsd/netinet6/in6_ifattach.c diff --git a/bsd/netinet6/in6_ifattach.c b/bsd/netinet6/in6_ifattach.c index 722b8f8b6..bd4ad95c0 100644 --- a/bsd/netinet6/in6_ifattach.c +++ b/bsd/netinet6/in6_ifattach.c @@ -1,4 +1,30 @@ -/* $KAME: in6_ifattach.c,v 1.41 2000/03/16 07:05:34 jinmei Exp $ */ +/* + * Copyright (c) 2003-2018 Apple Inc. All rights reserved. + * + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ + * + * This file contains Original Code and/or Modifications of Original Code + * as defined in and that are subject to the Apple Public Source License + * Version 2.0 (the 'License'). You may not use this file except in + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. + * + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * + * The Original Code and all software distributed under the License are + * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, + * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. + * Please see the License for the specific language governing rights and + * limitations under the License. + * + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ + */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. @@ -33,814 +59,1136 @@ #include #include #include +#include #include #include -#ifdef __bsdi__ -#include -#elif defined(__OpenBSD__) -#include -#else -#include -#endif +#include +#include +#include +#include #include #include #include #include +#include +#include #include #include -#ifndef __NetBSD__ #include -#endif +#include +#include #include #include +#include +#include #include #include #include +#include #include +#include -static struct in6_addr llsol; +u_int32_t in6_maxmtu = 0; +extern lck_mtx_t *nd6_mutex; -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; +#if IP6_AUTO_LINKLOCAL +int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; +#else +int ip6_auto_linklocal = 1; /* enable by default */ +#endif -int found_first_ifid = 0; -#define IFID_LEN 8 -static u_int8_t first_ifid[IFID_LEN]; +extern struct inpcbinfo udbinfo; +extern struct inpcbinfo ripcbinfo; -static int laddr_to_eui64 __P((u_int8_t *, u_int8_t *, size_t)); -static int gen_rand_eui64 __P((u_int8_t *)); +static const unsigned int in6_extra_size = sizeof(struct in6_ifextra); +static const unsigned int in6_extra_bufsize = in6_extra_size + + sizeof(void *) + sizeof(uint64_t); -#define DEBUG 1 +static int get_rand_iid(struct ifnet *, struct in6_addr *); +static int in6_generate_tmp_iid(u_int8_t *, const u_int8_t *, u_int8_t *); +static int in6_select_iid_from_all_hw(struct ifnet *, struct ifnet *, + struct in6_addr *); +static int in6_ifattach_linklocal(struct ifnet *, struct in6_aliasreq *); +static int in6_ifattach_loopback(struct ifnet *); +/* + * 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 SHA1(hostname) for it. + * + * in6 - upper 64bits are preserved + */ static int -laddr_to_eui64(dst, src, len) - u_int8_t *dst; - u_int8_t *src; - size_t len; +get_rand_iid( + __unused struct ifnet *ifp, + struct in6_addr *in6) /* upper 64bits are preserved */ { - static u_int8_t zero[8]; + SHA1_CTX ctxt; + u_int8_t digest[SHA1_RESULTLEN]; + int hostnlen; - bzero(zero, sizeof(zero)); + /* generate 8 bytes of pseudo-random value. */ + bzero(&ctxt, sizeof(ctxt)); + SHA1Init(&ctxt); + lck_mtx_lock(&hostname_lock); + hostnlen = strlen(hostname); + SHA1Update(&ctxt, hostname, hostnlen); + lck_mtx_unlock(&hostname_lock); + SHA1Final(digest, &ctxt); - switch (len) { - case 6: - if (bcmp(zero, src, 6) == 0) - return EINVAL; - dst[0] = src[0]; - dst[1] = src[1]; - dst[2] = src[2]; - dst[3] = 0xff; - dst[4] = 0xfe; - dst[5] = src[3]; - dst[6] = src[4]; - dst[7] = src[5]; - break; - case 8: - if (bcmp(zero, src, 8) == 0) - return EINVAL; - bcopy(src, dst, len); - break; - default: - return EINVAL; - } + /* assumes sizeof (digest) > sizeof (iid) */ + bcopy(digest, &in6->s6_addr[8], 8); + + /* make sure to set "u" bit to local, and "g" bit to individual. */ + in6->s6_addr[8] &= ~ND6_EUI64_GBIT; /* g bit to "individual" */ + in6->s6_addr[8] |= ND6_EUI64_UBIT; /* u bit to "local" */ + + /* convert EUI64 into IPv6 interface identifier */ + ND6_EUI64_TO_IFID(in6); return 0; } -/* - * Generate a last-resort interface identifier, when the machine has no - * IEEE802/EUI64 address sources. - * The address should be random, and should not change across reboot. - */ static int -gen_rand_eui64(dst) - u_int8_t *dst; +in6_generate_tmp_iid( + u_int8_t *seed0, + const u_int8_t *seed1, + u_int8_t *ret) { - MD5_CTX ctxt; - u_int8_t digest[16]; -#if defined(__FreeBSD__) || defined (__APPLE__) - int hostnamelen = strlen(hostname); -#endif + SHA1_CTX ctxt; + u_int8_t seed[16], nullbuf[8], digest[SHA1_RESULTLEN]; + u_int32_t val32; + struct timeval tv; + + /* If there's no history, start with a random seed. */ + bzero(nullbuf, sizeof(nullbuf)); + if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { + int i; + + for (i = 0; i < 2; i++) { + getmicrotime(&tv); + val32 = RandomULong() ^ 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); - /* generate 8bytes of pseudo-random value. */ + if ((0)) { /* for debugging purposes only */ + int i; + + printf("%s: new randomized ID from: ", __func__); + 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, hostname, hostnamelen); - MD5Final(digest, &ctxt); + SHA1Init(&ctxt); + SHA1Update(&ctxt, seed, sizeof(seed)); + SHA1Final(digest, &ctxt); + + /* + * RFC 4941 3.2.1. (3) + * Take the left-most 64-bits of the SHA1 digest and set bit 6 (the + * left-most bit is numbered 0) to zero. + */ + bcopy(digest, ret, 8); + ret[0] &= ~ND6_EUI64_UBIT; - /* assumes sizeof(digest) > sizeof(first_ifid) */ - bcopy(digest, dst, 8); + /* + * 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(info, + "%s: computed SHA1 value is zero.\n", __func__); - /* make sure to set "u" bit to local, and "g" bit to individual. */ - dst[0] &= 0xfe; - dst[0] |= 0x02; /* EUI64 "local" */ + getmicrotime(&tv); + val32 = random() ^ tv.tv_usec; + val32 = 1 + (val32 % (0xffffffff - 1)); + } + + /* + * RFC 4941 3.2.1. (4) + * Take the next 64-bits of the SHA1 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; } /* - * Find first ifid on list of interfaces. - * This is assumed that ifp0's interface token (for example, IEEE802 MAC) - * is globally unique. We may need to have a flag parameter in the future. + * Get interface identifier for the specified interface using the method in + * Appendix A of RFC 4291. + * + * XXX assumes single sockaddr_dl (AF_LINK address) per an interface + * + * in6 - upper 64bits are preserved */ int -in6_ifattach_getifid(ifp0) - struct ifnet *ifp0; +in6_iid_from_hw(struct ifnet *ifp, struct in6_addr *in6) { - struct ifnet *ifp; - struct ifaddr *ifa; - u_int8_t *addr = NULL; - int addrlen = 0; + struct ifaddr *ifa = NULL; 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 }; + int err = -1; + + /* Why doesn't this code use ifnet_addrs? */ + ifnet_lock_shared(ifp); + ifa = ifp->if_lladdr; + sdl = (struct sockaddr_dl *)(void *)ifa->ifa_addr; + if (sdl->sdl_alen == 0) { + ifnet_lock_done(ifp); + return -1; + } + IFA_ADDREF(ifa); /* for this routine */ + ifnet_lock_done(ifp); - if (found_first_ifid) - return 0; + IFA_LOCK(ifa); + addr = (u_int8_t *) LLADDR(sdl); + addrlen = sdl->sdl_alen; -#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) - for (ifp = ifnet; ifp; ifp = ifp->if_next) -#else - for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) -#endif - { - if (ifp0 != NULL && ifp0 != ifp) - continue; -#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) - for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) -#else - for (ifa = ifp->if_addrlist.tqh_first; - ifa; - ifa = ifa->ifa_list.tqe_next) + /* get EUI64 */ + switch (ifp->if_type) { + case IFT_ETHER: + case IFT_FDDI: + case IFT_ISO88025: + case IFT_ATM: + case IFT_IEEE1394: + case IFT_L2VLAN: + case IFT_IEEE8023ADLAG: +#if IFT_IEEE80211 + case IFT_IEEE80211: #endif - { - 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; - switch (ifp->if_type) { - case IFT_ETHER: - case IFT_FDDI: - case IFT_ATM: - /* IEEE802/EUI64 cases - what others? */ - addr = LLADDR(sdl); - addrlen = sdl->sdl_alen; - /* - * to copy ifid from IEEE802/EUI64 interface, - * u bit of the source needs to be 0. - */ - if ((addr[0] & 0x02) != 0) - break; - goto found; - case IFT_ARCNET: - /* - * ARCnet interface token cannot be used as - * globally unique identifier due to its - * small bitwidth. - */ - break; - default: - break; - } + case IFT_BRIDGE: + case IFT_6LOWPAN: + /* 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) { + goto done; } - } -#if DEBUG - printf("in6_ifattach_getifid: failed to get EUI64"); -#endif - return EADDRNOTAVAIL; -found: - if (laddr_to_eui64(first_ifid, addr, addrlen) == 0) - found_first_ifid = 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) { + goto done; + } + if (bcmp(addr, allone, addrlen) == 0) { + goto done; + } - if (found_first_ifid) { - printf("%s: supplying EUI64: " - "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", - if_name(ifp), - first_ifid[0] & 0xff, first_ifid[1] & 0xff, - first_ifid[2] & 0xff, first_ifid[3] & 0xff, - first_ifid[4] & 0xff, first_ifid[5] & 0xff, - first_ifid[6] & 0xff, first_ifid[7] & 0xff); + /* 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; - /* invert u bit to convert EUI64 to RFC2373 interface ID. */ - first_ifid[0] ^= 0x02; + case IFT_ARCNET: + if (addrlen != 1) { + goto done; + } + if (!addr[0]) { + goto done; + } - return 0; - } else { -#if DEBUG - printf("in6_ifattach_getifid: failed to get EUI64"); + bzero(&in6->s6_addr[8], 8); + in6->s6_addr[15] = addr[0]; + + /* + * due to insufficient bitwidth, we mark it local. + */ + in6->s6_addr[8] &= ~ND6_EUI64_GBIT; /* g to "individual" */ + in6->s6_addr[8] |= ND6_EUI64_UBIT; /* u to "local" */ + break; + + case IFT_GIF: +#if IFT_STF + case IFT_STF: #endif - return EADDRNOTAVAIL; + /* + * RFC2893 says: "SHOULD use IPv4 address as IID source". + * however, IPv4 address is not very suitable as unique + * identifier source (can be renumbered). + * we don't do this. + */ + goto done; + + case IFT_CELLULAR: + goto done; + + default: + goto done; + } + + /* sanity check: g bit must not indicate "group" */ + if (ND6_EUI64_GROUP(in6)) { + goto done; } + + /* convert EUI64 into IPv6 interface identifier */ + ND6_EUI64_TO_IFID(in6); + + /* + * sanity check: iid must not be all zero, avoid conflict with + * subnet router anycast + */ + if ((in6->s6_addr[8] & ~(ND6_EUI64_GBIT | ND6_EUI64_UBIT)) == 0x00 && + bcmp(&in6->s6_addr[9], allzero, 7) == 0) { + goto done; + } + + err = 0; /* found */ + +done: + /* This must not be the last reference to the lladdr */ + if (IFA_REMREF_LOCKED(ifa) == NULL) { + panic("%s: unexpected (missing) refcnt ifa=%p", __func__, ifa); + /* NOTREACHED */ + } + IFA_UNLOCK(ifa); + return err; } /* - * XXX multiple loopback interface needs more care. for instance, - * nodelocal address needs to be configured onto only one of them. + * Get interface identifier for the specified interface using the method in + * Appendix A of RFC 4291. If it is not available on ifp0, borrow interface + * identifier from other information sources. + * + * ifp - primary EUI64 source + * altifp - secondary EUI64 source + * in6 - IPv6 address to output IID */ -void -in6_ifattach(ifp, type, laddr, noloop) - struct ifnet *ifp; - u_int type; - caddr_t laddr; - /* size_t laddrlen; */ - int noloop; +static int +in6_select_iid_from_all_hw( + struct ifnet *ifp0, + struct ifnet *altifp, /* secondary EUI64 source */ + struct in6_addr *in6) { - static size_t if_indexlim = 8; - struct sockaddr_in6 mltaddr; - struct sockaddr_in6 mltmask; - struct sockaddr_in6 gate; - struct sockaddr_in6 mask; -#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) - struct ifaddr **ifap; -#endif + struct ifnet *ifp; - struct in6_ifaddr *ia, *ib, *oia; - struct ifaddr *ifa; - int rtflag = 0; - int s; - int error; + /* first, try to get it from the interface itself */ + if (in6_iid_from_hw(ifp0, in6) == 0) { + nd6log(debug, "%s: IID derived from HW interface.\n", + if_name(ifp0)); + goto success; + } - if (type == IN6_IFT_P2P && found_first_ifid == 0) { - printf("%s: no ifid available for IPv6 link-local address\n", - if_name(ifp)); -#if 0 - return; -#else - /* last resort */ - if (gen_rand_eui64(first_ifid) == 0) { - printf("%s: using random value as EUI64: " - "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", - if_name(ifp), - first_ifid[0] & 0xff, first_ifid[1] & 0xff, - first_ifid[2] & 0xff, first_ifid[3] & 0xff, - first_ifid[4] & 0xff, first_ifid[5] & 0xff, - first_ifid[6] & 0xff, first_ifid[7] & 0xff); - /* - * invert u bit to convert EUI64 to RFC2373 interface - * ID. - */ - first_ifid[0] ^= 0x02; + /* try secondary EUI64 source. this basically is for ATM PVC */ + if (altifp && in6_iid_from_hw(altifp, in6) == 0) { + nd6log(debug, "%s: IID from alterate HW interface %s.\n", + if_name(ifp0), if_name(altifp)); + goto success; + } - found_first_ifid = 1; + /* next, try to get it from some other hardware interface */ + ifnet_head_lock_shared(); + TAILQ_FOREACH(ifp, &ifnet_head, if_list) { + if (ifp == ifp0) { + continue; + } + if (in6_iid_from_hw(ifp, in6) != 0) { + continue; + } + + /* + * to borrow IID from other interface, IID needs to be + * globally unique + */ + if (ND6_IFID_UNIVERSAL(in6)) { + nd6log(debug, "%s: borrowed IID from %s\n", + if_name(ifp0), if_name(ifp)); + ifnet_head_done(); + goto success; } -#endif } + ifnet_head_done(); - if ((ifp->if_flags & IFF_MULTICAST) == 0) { - printf("%s: not multicast capable, IPv6 not enabled\n", - if_name(ifp)); - return; + /* last resort: get from random number source */ + if (get_rand_iid(ifp, in6) == 0) { + nd6log(debug, "%s: IID from PRNG.\n", if_name(ifp0)); + goto success; + } + + printf("%s: failed to get interface identifier\n", if_name(ifp0)); + return -1; + +success: + nd6log(info, "%s: IID: " + "%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 in6_aliasreq *ifra) +{ + struct in6_ifaddr *ia; + struct nd_prefix pr0, *pr; + int i, error; + + VERIFY(ifra != NULL); + + proto_plumb(PF_INET6, ifp); + + error = in6_update_ifa(ifp, ifra, IN6_IFAUPDATE_DADDELAY, &ia); + if (error != 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(info, "%s: failed to " + "configure a link-local address on %s " + "(errno=%d)\n", + __func__, if_name(ifp), error); + } + return EADDRNOTAVAIL; } + VERIFY(ia != NULL); /* - * 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 + * 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... */ - 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; + bzero(&pr0, sizeof(pr0)); + lck_mtx_init(&pr0.ndpr_lock, ifa_mtx_grp, ifa_mtx_attr); + 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]; } - /* - * To prevent to assign link-local address to PnP network - * cards multiple times. - * This is lengthy for P2P and LOOP but works. + * Initialize parameters. The link-local prefix must always be + * on-link, and its lifetimes never expire. */ -#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) - ifa = ifp->if_addrlist; - if (ifa != NULL) { - for ( ; ifa; ifa = ifa->ifa_next) { - ifap = &ifa->ifa_next; - if (ifa->ifa_addr->sa_family != AF_INET6) - continue; - if (IN6_IS_ADDR_LINKLOCAL(&satosin6(ifa->ifa_addr)->sin6_addr)) - return; - } - } else - ifap = &ifp->if_addrlist; -#else - ifa = TAILQ_FIRST(&ifp->if_addrlist); - if (ifa != NULL) { - for ( ; ifa; ifa = TAILQ_NEXT(ifa, ifa_list)) { - if (ifa->ifa_addr->sa_family != AF_INET6) - continue; - if (IN6_IS_ADDR_LINKLOCAL(&satosin6(ifa->ifa_addr)->sin6_addr)) - return; + pr0.ndpr_raf_onlink = 1; + pr0.ndpr_raf_auto = 1; /* probably meaningless */ + pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; + pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; + pr0.ndpr_stateflags |= NDPRF_STATIC; + /* + * 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 ((pr = nd6_prefix_lookup(&pr0, ND6_PREFIX_EXPIRY_UNSPEC)) == NULL) { + if ((error = nd6_prelist_add(&pr0, NULL, &pr, TRUE)) != 0) { + IFA_REMREF(&ia->ia_ifa); + lck_mtx_destroy(&pr0.ndpr_lock, ifa_mtx_grp); + return error; } - } else { - TAILQ_INIT(&ifp->if_addrlist); } -#endif + + in6_post_msg(ifp, KEV_INET6_NEW_LL_ADDR, ia, NULL); + IFA_REMREF(&ia->ia_ifa); + + /* Drop use count held above during lookup/add */ + if (pr != NULL) { + NDPR_REMREF(pr); + } + + lck_mtx_destroy(&pr0.ndpr_lock, ifa_mtx_grp); + return 0; +} + +static int +in6_ifattach_loopback( + struct ifnet *ifp) /* must be IFT_LOOP */ +{ + struct in6_aliasreq ifra; + struct in6_ifaddr *ia; + int error; + + bzero(&ifra, sizeof(ifra)); /* - * link-local address + * in6_update_ifa() does not use ifra_name, but we accurately set it + * for safety. */ - ia = (struct in6_ifaddr *)_MALLOC(sizeof(*ia), M_IFADDR, M_WAITOK); - bzero((caddr_t)ia, sizeof(*ia)); - ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; - if (ifp->if_flags & IFF_POINTOPOINT) - ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; - else - ia->ia_ifa.ifa_dstaddr = NULL; - ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; - ia->ia_ifp = ifp; -#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) - *ifap = (struct ifaddr *)ia; -#else - TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); -#endif - ia->ia_ifa.ifa_refcnt++; + strlcpy(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; /* - * Also link into the IPv6 address chain beginning with in6_ifaddr. - * kazu opposed it, but itojun & jinmei wanted. + * Always initialize ia_dstaddr (= broadcast address) to loopback + * address. Follows IPv4 practice - see in_ifinit(). */ - if ((oia = in6_ifaddr) != NULL) { - for (; oia->ia_next; oia = oia->ia_next) - continue; - oia->ia_next = ia; - } else - in6_ifaddr = ia; - ia->ia_ifa.ifa_refcnt++; - - ia->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6); - ia->ia_prefixmask.sin6_family = AF_INET6; - ia->ia_prefixmask.sin6_addr = in6mask64; - - bzero(&ia->ia_addr, sizeof(struct sockaddr_in6)); - ia->ia_addr.sin6_len = sizeof(struct sockaddr_in6); - ia->ia_addr.sin6_family = AF_INET6; - ia->ia_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); - ia->ia_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); - ia->ia_addr.sin6_addr.s6_addr32[1] = 0; - - switch (type) { - case IN6_IFT_LOOP: - ia->ia_addr.sin6_addr.s6_addr32[2] = 0; - ia->ia_addr.sin6_addr.s6_addr32[3] = htonl(1); - if (strcmp(ifp->if_name, "lo") == 0) { - ia->ia_ifa.ifa_dlt = lo_attach_inet(ifp); - printf("in6_ifattach: IFT_LOOP setting initial ifp=%s%d initial ia=%x ifa_dlt=%x\n", - ifp->if_name, ifp->if_unit, ia, ia->ia_ifa.ifa_dlt); + 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; + + /* add the new interface address */ + error = in6_update_ifa(ifp, &ifra, 0, &ia); + if (error != 0) { + nd6log(error, + "%s: failed to configure loopback address %s (error=%d)\n", + __func__, if_name(ifp), error); + VERIFY(ia == NULL); + return EADDRNOTAVAIL; + } + + VERIFY(ia != NULL); + IFA_REMREF(&ia->ia_ifa); + return 0; +} + +/* + * compute NI group address, based on the current hostname setting. + * see RFC 4620. + * + * 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; + SHA1_CTX ctxt; + u_int8_t digest[SHA1_RESULTLEN]; + 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; + strlcpy(n, name, l); + n[(int)l] = '\0'; + for (q = (u_char *) n; *q; q++) { + if ('A' <= *q && *q <= 'Z') { + *q = *q - 'A' + 'a'; } - break; - case IN6_IFT_802: - ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; - ia->ia_ifa.ifa_flags |= RTF_CLONING; - rtflag = RTF_CLONING; - if (strcmp(ifp->if_name, "en") == 0) { - ia->ia_ifa.ifa_dlt = ether_attach_inet6(ifp); - printf("in6_ifattach: IFT_802 setting initial ifp=%s%d initial ia=%x ifa_dlt=%x\n", - ifp->if_name, ifp->if_unit, ia, ia->ia_ifa.ifa_dlt); - } - - /* fall through */ - case IN6_IFT_P2P802: - ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; - ia->ia_ifa.ifa_flags |= RTF_CLONING; - rtflag = RTF_CLONING; - if (laddr == NULL) - break; - /* XXX use laddrlen */ - if (laddr_to_eui64(&ia->ia_addr.sin6_addr.s6_addr8[8], - laddr, 6) != 0) { - break; - } - /* invert u bit to convert EUI64 to RFC2373 interface ID. */ - ia->ia_addr.sin6_addr.s6_addr8[8] ^= 0x02; - if (found_first_ifid == 0) - in6_ifattach_getifid(ifp); - bzero(&ia->ia_dstaddr, sizeof(struct sockaddr_in6)); - ia->ia_dstaddr.sin6_len = sizeof(struct sockaddr_in6); - ia->ia_dstaddr.sin6_family = AF_INET6; - - if (ia->ia_ifa.ifa_dlt == 0) { - ia->ia_ifa.ifa_dlt = ifp; -#if DEBUG - printf("in6_ifattach: IFT_P2P802 setting initial ifp=%s%d initial ia=%x ifa_dlt=%x\n", - ifp->if_name, ifp->if_unit, ia, ia->ia_ifa.ifa_dlt); -#endif + } + + /* generate 16 bytes of pseudo-random value. */ + bzero(&ctxt, sizeof(ctxt)); + SHA1Init(&ctxt); + SHA1Update(&ctxt, &l, sizeof(l)); + SHA1Update(&ctxt, n, l); + SHA1Final(digest, &ctxt); + + bzero(in6, sizeof(*in6)); + in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; + in6->s6_addr8[11] = 2; + in6->s6_addr8[12] = 0xff; + /* copy first 3 bytes of prefix into address */ + bcopy(digest, &in6->s6_addr8[13], 3); + if (in6_setscope(in6, ifp, NULL)) { + return -1; /* XXX: should not fail */ + } + return 0; +} + +int +in6_domifattach(struct ifnet *ifp) +{ + int error; + + VERIFY(ifp != NULL); + + error = proto_plumb(PF_INET6, ifp); + if (error != 0) { + if (error != EEXIST) { + log(LOG_ERR, "%s: proto_plumb returned %d if=%s\n", + __func__, error, if_name(ifp)); + } + } else { + error = in6_ifattach_prelim(ifp); + if (error != 0) { + int errorx; + + log(LOG_ERR, + "%s: in6_ifattach_prelim returned %d if=%s%d\n", + __func__, error, ifp->if_name, ifp->if_unit); + + errorx = proto_unplumb(PF_INET6, ifp); + if (errorx != 0) { /* XXX should not fail */ + log(LOG_ERR, + "%s: proto_unplumb returned %d if=%s%d\n", + __func__, errorx, ifp->if_name, + ifp->if_unit); + } } - break; - case IN6_IFT_P2P: - ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; - ia->ia_ifa.ifa_flags |= RTF_CLONING; - rtflag = RTF_CLONING; - bcopy((caddr_t)first_ifid, - (caddr_t)&ia->ia_addr.sin6_addr.s6_addr8[8], - IFID_LEN); - bzero(&ia->ia_dstaddr, sizeof(struct sockaddr_in6)); - ia->ia_dstaddr.sin6_len = sizeof(struct sockaddr_in6); - ia->ia_dstaddr.sin6_family = AF_INET6; - - if (strcmp(ifp->if_name, "gif") == 0) { - ia->ia_ifa.ifa_dlt = gif_attach_inet(ifp); -#if DEBUG - printf("in6_ifattach: IFT_P2P setting initial ifp=%s%d initial ia=%x ifa_dlt=%x\n", - ifp->if_name, ifp->if_unit, ia, ia->ia_ifa.ifa_dlt); -#endif - } - break; - case IN6_IFT_ARCNET: - ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; - ia->ia_ifa.ifa_flags |= RTF_CLONING; - rtflag = RTF_CLONING; - if (laddr == NULL) - break; - - /* make non-global IF id out of link-level address */ - bzero(&ia->ia_addr.sin6_addr.s6_addr8[8], 7); - ia->ia_addr.sin6_addr.s6_addr8[15] = *laddr; - ia->ia_ifa.ifa_dlt = ifp; -#if DEBUG - printf("in6_ifattach: IFT_ARCNET setting initial ifp=%s%d initial ia=%x ifa_dlt=%x\n", - ifp->if_name, ifp->if_unit, ia, ia->ia_ifa.ifa_dlt); -#endif } - ia->ia_ifa.ifa_metric = ifp->if_metric; + return error; +} +int +in6_ifattach_prelim(struct ifnet *ifp) +{ + struct in6_ifextra *ext; + void **pbuf, *base; + int error = 0; + struct in6_ifaddr *ia6 = NULL; + + VERIFY(ifp != NULL); + + /* quirks based on interface type */ + switch (ifp->if_type) { +#if 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 skipmcast; +#endif + default: + break; + } /* - * give the interface a chance to initialize, in case this - * is the first address to be added. + * IPv6 requires multicast capability at the interface. + * (previously, this was a silent error.) */ - s = splimp(); -#ifdef __APPLE__ - error = dlil_ioctl(0, ifp, SIOCSIFADDR, (caddr_t)ia); -#else - error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); -#endif - splx(s); -#if DEBUG - printf("in6_ifattach: Calling SIOCSIFADDR for if=%s%d ia=%x error=%x\n", ifp->if_name, ifp->if_unit, ia, error); -#endif - if (error == EOPNOTSUPP) - error = 0; - - if (error) { - switch (error) { - case EAFNOSUPPORT: - printf("%s: IPv6 not supported\n", - if_name(ifp)); - break; - default: - printf("%s: SIOCSIFADDR error %d\n", - if_name(ifp), error); - break; - } - - /* undo changes */ -#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) - *ifap = NULL; -#else - TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); + if ((ifp->if_flags & IFF_MULTICAST) == 0) { + nd6log0(info, "in6_ifattach: %s is not multicast capable, IPv6 not enabled\n", + if_name(ifp)); + return EINVAL; + } + +#if IFT_STF +skipmcast: #endif - IFAFREE(&ia->ia_ifa); - if (oia) - oia->ia_next = ia->ia_next; - else - in6_ifaddr = ia->ia_next; - IFAFREE(&ia->ia_ifa); - return; - } - - /* add route to the interface. */ - rtrequest(RTM_ADD, - (struct sockaddr *)&ia->ia_addr, - (struct sockaddr *)&ia->ia_addr, - (struct sockaddr *)&ia->ia_prefixmask, - RTF_UP|rtflag, - (struct rtentry **)0); - ia->ia_flags |= IFA_ROUTE; - - if (type == IN6_IFT_P2P || type == IN6_IFT_P2P802) { + + if (ifp->if_inet6data == NULL) { + ext = (struct in6_ifextra *)_MALLOC(in6_extra_bufsize, M_IFADDR, + M_WAITOK | M_ZERO); + if (!ext) { + return ENOMEM; + } + base = (void *)P2ROUNDUP((intptr_t)ext + sizeof(uint64_t), + sizeof(uint64_t)); + VERIFY(((intptr_t)base + in6_extra_size) <= + ((intptr_t)ext + in6_extra_bufsize)); + pbuf = (void **)((intptr_t)base - sizeof(void *)); + *pbuf = ext; + ifp->if_inet6data = base; + IN6_IFEXTRA(ifp)->ii_llt = in6_lltattach(ifp); + VERIFY(IS_P2ALIGNED(ifp->if_inet6data, sizeof(uint64_t))); + } else { + /* + * Since the structure is never freed, we need to zero out + * some of its members. We avoid zeroing out the scope6 + * structure on purpose because other threads might be + * using its contents. + */ + bzero(&IN6_IFEXTRA(ifp)->icmp6_ifstat, + sizeof(IN6_IFEXTRA(ifp)->icmp6_ifstat)); + bzero(&IN6_IFEXTRA(ifp)->in6_ifstat, + sizeof(IN6_IFEXTRA(ifp)->in6_ifstat)); + /* XXX TBD Purge the layer two table */ /* - * route local address to loopback + * XXX When recycling, nd_ifinfo gets initialized, other + * than the lock, inside nd6_ifattach */ - bzero(&gate, sizeof(gate)); - gate.sin6_len = sizeof(struct sockaddr_in6); - gate.sin6_family = AF_INET6; - gate.sin6_addr = in6addr_loopback; - bzero(&mask, sizeof(mask)); - mask.sin6_len = sizeof(struct sockaddr_in6); - mask.sin6_family = AF_INET6; - mask.sin6_addr = in6mask64; - rtrequest(RTM_ADD, - (struct sockaddr *)&ia->ia_addr, - (struct sockaddr *)&gate, - (struct sockaddr *)&mask, - RTF_UP|RTF_HOST, - (struct rtentry **)0); } /* - * loopback address + * XXX Only initialize IPv6 configuration for the interface + * if interface has not yet been configured with + * link local IPv6 address. + * Could possibly be optimized with an interface flag if need + * be. For now using in6ifa_ifpforlinklocal. */ - ib = (struct in6_ifaddr *)NULL; - if (type == IN6_IFT_LOOP) { - ib = (struct in6_ifaddr *) - _MALLOC(sizeof(*ib), M_IFADDR, M_WAITOK); - bzero((caddr_t)ib, sizeof(*ib)); - ib->ia_ifa.ifa_addr = (struct sockaddr *)&ib->ia_addr; - ib->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ib->ia_dstaddr; - ib->ia_ifa.ifa_netmask = (struct sockaddr *)&ib->ia_prefixmask; - ib->ia_ifa.ifa_dlt = lo_attach_inet(ifp); - ib->ia_ifp = ifp; - - ia->ia_next = ib; -#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) - ia->ia_ifa.ifa_next = (struct ifaddr *)ib; -#else - TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ib, - ifa_list); -#endif - ib->ia_ifa.ifa_refcnt++; + ia6 = in6ifa_ifpforlinklocal(ifp, 0); + if (ia6 == NULL) { + IN6_IFEXTRA(ifp)->netsig_len = 0; + bzero(&IN6_IFEXTRA(ifp)->netsig, + sizeof(IN6_IFEXTRA(ifp)->netsig)); + bzero(IN6_IFEXTRA(ifp)->nat64_prefixes, + sizeof(IN6_IFEXTRA(ifp)->nat64_prefixes)); + /* initialize NDP variables */ + nd6_ifattach(ifp); + } else { + VERIFY(ND_IFINFO(ifp)->initialized); + IFA_REMREF(&ia6->ia_ifa); + ia6 = NULL; + } + scope6_ifattach(ifp); + + /* initialize loopback interface address */ + if ((ifp->if_flags & IFF_LOOPBACK) != 0) { + error = in6_ifattach_loopback(ifp); + if (error != 0) { + log(LOG_ERR, "%s: in6_ifattach_loopback returned %d\n", + __func__, error, ifp->if_name, + ifp->if_unit); + return error; + } + } - ib->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6); - ib->ia_prefixmask.sin6_family = AF_INET6; - ib->ia_prefixmask.sin6_addr = in6mask128; - ib->ia_addr.sin6_len = sizeof(struct sockaddr_in6); - ib->ia_addr.sin6_family = AF_INET6; - ib->ia_addr.sin6_addr = in6addr_loopback; + /* update dynamically. */ + if (in6_maxmtu < ifp->if_mtu) { + in6_maxmtu = ifp->if_mtu; + } - /* - * Always initialize ia_dstaddr (= broadcast address) - * to loopback address, to make getifaddr happier. - * - * For BSDI, it is mandatory. The BSDI version of - * ifa_ifwithroute() rejects to add a route to the loopback - * interface. Even for other systems, loopback looks somewhat - * special. - */ - ib->ia_dstaddr.sin6_len = sizeof(struct sockaddr_in6); - ib->ia_dstaddr.sin6_family = AF_INET6; - ib->ia_dstaddr.sin6_addr = in6addr_loopback; + VERIFY(error == 0); + return 0; +} - ib->ia_ifa.ifa_metric = ifp->if_metric; +/* + * This routine is only meant to configure IPv6 Link Local + * addresses. + */ +int +in6_ifattach_aliasreq(struct ifnet *ifp, struct ifnet *altifp, + struct in6_aliasreq *ifra0) +{ + int error; + struct in6_ifaddr *ia6; + struct in6_aliasreq ifra; - rtrequest(RTM_ADD, - (struct sockaddr *)&ib->ia_addr, - (struct sockaddr *)&ib->ia_addr, - (struct sockaddr *)&ib->ia_prefixmask, - RTF_UP|RTF_HOST, - (struct rtentry **)0); + error = in6_ifattach_prelim(ifp); + if (error != 0) { + return error; + } - ib->ia_flags |= IFA_ROUTE; + if (!ip6_auto_linklocal) { + return 0; } /* - * join multicast + * Assign a link-local address, only if there isn't one here already. + * XXX If we ever allow more than one LLA on the interface + * make sure that the corresponding prefix on the prefixlist + * is reference counted and the address's prefix pointer + * points to the prefix. */ - if (ifp->if_flags & IFF_MULTICAST) { - int error; /* not used */ + ia6 = in6ifa_ifpforlinklocal(ifp, 0); + if (ia6 != NULL) { + IFA_REMREF(&ia6->ia_ifa); + return 0; + } -#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined (__APPLE__) - /* Restore saved multicast addresses(if any). */ - in6_restoremkludge(ia, ifp); -#endif + bzero(&ifra, sizeof(ifra)); + + /* + * in6_update_ifa() does not use ifra_name, but we accurately set it + * for safety. + */ + strlcpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); - bzero(&mltmask, sizeof(mltmask)); - mltmask.sin6_len = sizeof(struct sockaddr_in6); - mltmask.sin6_family = AF_INET6; - mltmask.sin6_addr = in6mask32; + /* Initialize the IPv6 interface address in our in6_aliasreq block */ + if (ifra0 != NULL) { + /* interface provided both addresses for us */ + struct sockaddr_in6 *sin6 = &ifra.ifra_addr; + struct in6_addr *in6 = &sin6->sin6_addr; + boolean_t ok = TRUE; - /* - * join link-local all-nodes address - */ - bzero(&mltaddr, sizeof(mltaddr)); - mltaddr.sin6_len = sizeof(struct sockaddr_in6); - mltaddr.sin6_family = AF_INET6; - mltaddr.sin6_addr = in6addr_linklocal_allnodes; - mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); - rtrequest(RTM_ADD, - (struct sockaddr *)&mltaddr, - (struct sockaddr *)&ia->ia_addr, - (struct sockaddr *)&mltmask, - RTF_UP|RTF_CLONING, /* xxx */ - (struct rtentry **)0); - (void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error); - - if (type == IN6_IFT_LOOP) { - /* - * join node-local all-nodes address - */ - mltaddr.sin6_addr = in6addr_nodelocal_allnodes; - rtrequest(RTM_ADD, - (struct sockaddr *)&mltaddr, - (struct sockaddr *)&ib->ia_addr, - (struct sockaddr *)&mltmask, - RTF_UP, - (struct rtentry **)0); - (void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error); + bcopy(&ifra0->ifra_addr, sin6, sizeof(struct sockaddr_in6)); + + if (sin6->sin6_family != AF_INET6 || sin6->sin6_port != 0) { + ok = FALSE; + } + if (ok && (in6->s6_addr16[0] != htons(0xfe80))) { + ok = FALSE; + } + if (ok) { + if (sin6->sin6_scope_id == 0 && in6->s6_addr16[1] == 0) { + in6->s6_addr16[1] = htons(ifp->if_index); + } else if (sin6->sin6_scope_id != 0 && + sin6->sin6_scope_id != ifp->if_index) { + ok = FALSE; + } else if (in6->s6_addr16[1] != 0 && + ntohs(in6->s6_addr16[1]) != ifp->if_index) { + ok = FALSE; + } + } + if (ok && (in6->s6_addr32[1] != 0)) { + ok = FALSE; + } + if (!ok) { + return EINVAL; + } + } else { + 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); + 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 { - /* - * join solicited multicast address - */ - bzero(&llsol, sizeof(llsol)); - llsol.s6_addr16[0] = htons(0xff02); - llsol.s6_addr16[1] = htons(ifp->if_index); - llsol.s6_addr32[1] = 0; - llsol.s6_addr32[2] = htonl(1); - llsol.s6_addr32[3] = ia->ia_addr.sin6_addr.s6_addr32[3]; - llsol.s6_addr8[12] = 0xff; - (void)in6_addmulti(&llsol, ifp, &error); + if (in6_select_iid_from_all_hw(ifp, altifp, + &ifra.ifra_addr.sin6_addr) != 0) { + nd6log(error, "%s: no IID available\n", + if_name(ifp)); + return EADDRNOTAVAIL; + } } } - /* update dynamically. */ - if (in6_maxmtu < ifp->if_mtu) - in6_maxmtu = ifp->if_mtu; + if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) { + return EADDRNOTAVAIL; + } - 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)); + /* Set the prefix mask */ + 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; + + /* Attach the link-local address */ + if (in6_ifattach_linklocal(ifp, &ifra) != 0) { + nd6log(info, + "%s: %s could not attach link-local address.\n", + __func__, if_name(ifp)); + /* NB: not an error */ } - 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)); + + return 0; +} + +int +in6_ifattach_llcgareq(struct ifnet *ifp, struct in6_cgareq *llcgasr) +{ + struct in6_aliasreq ifra; + struct in6_ifaddr *ia6 = NULL; + struct nd_ifinfo *ndi = NULL; + int error; + + VERIFY(llcgasr != NULL); + + error = in6_ifattach_prelim(ifp); + if (error != 0) { + return error; } - /* initialize NDP variables */ - nd6_ifattach(ifp); + if (!ip6_auto_linklocal) { + return 0; + } - /* mark the address TENTATIVE, if needed. */ - switch (ifp->if_type) { - case IFT_ARCNET: - case IFT_ETHER: - case IFT_FDDI: -#if 0 - case IFT_ATM: - case IFT_SLIP: - case IFT_PPP: -#endif - ia->ia6_flags |= IN6_IFF_TENTATIVE; - /* nd6_dad_start() will be called in in6_if_up */ - break; - case IFT_DUMMY: - case IFT_GIF: /*XXX*/ - case IFT_LOOP: - case IFT_FAITH: - default: - break; + if (nd6_send_opstate == ND6_SEND_OPMODE_DISABLED) { + return ENXIO; } - return; + ndi = ND_IFINFO(ifp); + VERIFY(ndi != NULL && ndi->initialized); + if ((ndi->flags & ND6_IFF_INSECURE) != 0) { + return ENXIO; + } + + /* + * Assign a link-local address, only if there isn't one here already. + * XXX If we ever allow more than one LLA on the interface + * make sure that the corresponding prefix on the prefixlist + * is reference counted and the address's prefix pointer + * points to the prefix. + */ + ia6 = in6ifa_ifpforlinklocal(ifp, 0); + if (ia6 != NULL) { + IFA_REMREF(&ia6->ia_ifa); + return 0; + } + + bzero(&ifra, sizeof(ifra)); + strlcpy(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); + ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; + ifra.ifra_flags = IN6_IFF_SECURED; + + in6_cga_node_lock(); + if (in6_cga_generate(&llcgasr->cgar_cgaprep, 0, + &ifra.ifra_addr.sin6_addr)) { + in6_cga_node_unlock(); + return EADDRNOTAVAIL; + } + in6_cga_node_unlock(); + + if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) { + return EADDRNOTAVAIL; + } + + /* Set the prefix mask */ + 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, but cryptographic + * ones may have finite preferred lifetime [if it's important to + * keep them from being used by applications as persistent device + * identifiers]. + */ + ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; + ifra.ifra_lifetime.ia6t_pltime = llcgasr->cgar_lifetime.ia6t_pltime; + + /* Attach the link-local address */ + if (in6_ifattach_linklocal(ifp, &ifra) != 0) { + /* NB: not an error */ + nd6log(info, + "%s: %s could not attach link-local address.\n", + __func__, if_name(ifp)); + } + + VERIFY(error == 0); + return error; } /* * NOTE: in6_ifdetach() does not support loopback if at this moment. */ void -in6_ifdetach(ifp) - struct ifnet *ifp; +in6_ifdetach(struct ifnet *ifp) { struct in6_ifaddr *ia, *oia; struct ifaddr *ifa; -#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) - struct ifaddr *ifaprev = NULL; -#endif struct rtentry *rt; - short rtflags; struct sockaddr_in6 sin6; - struct in6_multi *in6m; -#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined (__APPLE__) - struct in6_multi *in6m_next; -#endif + struct in6_multi_mship *imm; + int unlinked; - /* nuke prefix list. this may try to remove some of ifaddrs as well */ - in6_purgeprefix(ifp); + LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_NOTOWNED); /* remove neighbor management table */ nd6_purge(ifp); -#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) - for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) -#else - for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) -#endif - { - if (ifa->ifa_addr->sa_family != AF_INET6 - || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { -#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) - ifaprev = ifa; -#endif + if (LLTABLE6(ifp)) { + lltable_free(LLTABLE6(ifp)); + } + + /* nuke any of IPv6 addresses we have */ + lck_rw_lock_exclusive(&in6_ifaddr_rwlock); + ia = in6_ifaddrs; + while (ia != NULL) { + if (ia->ia_ifa.ifa_ifp != ifp) { + ia = ia->ia_next; + continue; + } + IFA_ADDREF(&ia->ia_ifa); /* for us */ + lck_rw_done(&in6_ifaddr_rwlock); + in6_purgeaddr(&ia->ia_ifa); + IFA_REMREF(&ia->ia_ifa); /* for us */ + lck_rw_lock_exclusive(&in6_ifaddr_rwlock); + /* + * Purging the address caused in6_ifaddr_rwlock + * to be dropped and reacquired; + * therefore search again from the beginning + * of in6_ifaddrs list. + */ + ia = in6_ifaddrs; + } + lck_rw_done(&in6_ifaddr_rwlock); + + ifnet_lock_exclusive(ifp); + + /* undo everything done by in6_ifattach(), just in case */ + ifa = TAILQ_FIRST(&ifp->if_addrlist); + while (ifa != NULL) { + IFA_LOCK(ifa); + if (ifa->ifa_addr->sa_family != AF_INET6 || + !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)-> + sin6_addr)) { + IFA_UNLOCK(ifa); + ifa = TAILQ_NEXT(ifa, ifa_list); continue; } ia = (struct in6_ifaddr *)ifa; -#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined (__APPLE__) - /* leave from all multicast groups joined */ - while ((in6m = LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) - in6_delmulti(in6m); -#endif + /* hold a reference for this routine */ + IFA_ADDREF_LOCKED(ifa); + /* remove from the linked list */ + if_detach_ifa(ifp, ifa); + IFA_UNLOCK(ifa); - /* remove from the routing table */ - if ((ia->ia_flags & IFA_ROUTE) - && (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0 -#if defined (__FreeBSD__) || defined (__APPLE__) - , 0UL -#endif - ))) { - 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); + /* + * Leaving the multicast group(s) may involve freeing the + * link address multicast structure(s) for the interface, + * which is protected by ifnet lock. To avoid violating + * lock ordering, we must drop ifnet lock before doing so. + * The ifa won't go away since we held a refcnt above. + */ + ifnet_lock_done(ifp); + + /* + * We have to do this work manually here instead of calling + * in6_purgeaddr() since in6_purgeaddr() uses the RTM_HOST flag. + */ + + /* + * leave from multicast groups we have joined for the interface + */ + IFA_LOCK(ifa); + while ((imm = ia->ia6_memberships.lh_first) != NULL) { + LIST_REMOVE(imm, i6mm_chain); + IFA_UNLOCK(ifa); + in6_leavegroup(imm); + IFA_LOCK(ifa); } - /* remove from the linked list */ -#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) - if (ifaprev) - ifaprev->ifa_next = ifa->ifa_next; - else - ifp->if_addrlist = ifa->ifa_next; -#else - TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); -#endif + /* remove from the routing table */ + if (ia->ia_flags & IFA_ROUTE) { + IFA_UNLOCK(ifa); + rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0); + if (rt != NULL) { + (void) rtrequest(RTM_DELETE, + (struct sockaddr *)&ia->ia_addr, + (struct sockaddr *)&ia->ia_addr, + (struct sockaddr *)&ia->ia_prefixmask, + rt->rt_flags, (struct rtentry **)0); + rtfree(rt); + } + } else { + IFA_UNLOCK(ifa); + } /* also remove from the IPv6 address chain(itojun&jinmei) */ + unlinked = 1; oia = ia; - if (oia == (ia = in6_ifaddr)) - in6_ifaddr = ia->ia_next; - else { - while (ia->ia_next && (ia->ia_next != oia)) + lck_rw_lock_exclusive(&in6_ifaddr_rwlock); + if (oia == (ia = in6_ifaddrs)) { + in6_ifaddrs = ia->ia_next; + } else { + while (ia->ia_next && (ia->ia_next != oia)) { ia = ia->ia_next; - if (ia->ia_next) + } + if (ia->ia_next) { ia->ia_next = oia->ia_next; -#if DEBUG - else - printf("%s: didn't unlink in6ifaddr from " + } else { + nd6log(error, + "%s: didn't unlink in6ifaddr from " "list\n", if_name(ifp)); -#endif + unlinked = 0; + } } + lck_rw_done(&in6_ifaddr_rwlock); - _FREE(ia, M_IFADDR); - } + ifa = &oia->ia_ifa; + /* + * release another refcnt for the link from in6_ifaddrs. + * Do this only if it's not already unlinked in the event + * that we lost the race, since in6_ifaddr_rwlock was + * momentarily dropped above. + */ + if (unlinked) { + IFA_REMREF(ifa); + } + /* release reference held for this routine */ + IFA_REMREF(ifa); -#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined (__APPLE__) - /* leave from all multicast groups joined */ - 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; + /* + * This is suboptimal, but since we dropped ifnet lock above + * the list might have changed. Repeat the search from the + * beginning until we find the first eligible IPv6 address. + */ + ifnet_lock_exclusive(ifp); + ifa = TAILQ_FIRST(&ifp->if_addrlist); } -#endif + ifnet_lock_done(ifp); -#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined(__APPLE__) - /* cleanup multicast address kludge table, if there is any */ - in6_purgemkludge(ifp); -#endif + /* invalidate route caches */ + routegenid_inet6_update(); - /* remove neighbor management table */ + /* + * 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) */ @@ -849,14 +1197,82 @@ in6_ifdetach(ifp) sin6.sin6_family = AF_INET6; sin6.sin6_addr = in6addr_linklocal_allnodes; sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); -#if !defined(__FreeBSD__) && !defined (__APPLE__) - if ((rt = rtalloc1((struct sockaddr *)&sin6, 0)) != NULL) -#else - if ((rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL)) != NULL) -#endif - { - rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), - rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); + rt = rtalloc1((struct sockaddr *)&sin6, 0, 0); + if (rt != NULL) { + RT_LOCK(rt); + if (rt->rt_ifp == ifp) { + /* + * Prevent another thread from modifying rt_key, + * rt_gateway via rt_setgate() after the rt_lock + * is dropped by marking the route as defunct. + */ + rt->rt_flags |= RTF_CONDEMNED; + RT_UNLOCK(rt); + (void) rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, + rt_mask(rt), rt->rt_flags, 0); + } else { + RT_UNLOCK(rt); + } rtfree(rt); } } + +void +in6_iid_mktmp(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); + + VERIFY(ndi != NULL && ndi->initialized); + lck_mtx_lock(&ndi->lock); + 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)); + + /* in6_generate_tmp_iid will update seedn and buf */ + (void) in6_generate_tmp_iid(ndi->randomseed0, ndi->randomseed1, + ndi->randomid); + } + + bcopy(ndi->randomid, retbuf, 8); + lck_mtx_unlock(&ndi->lock); +} + +void +in6_tmpaddrtimer(void *arg) +{ +#pragma unused(arg) + struct ifnet *ifp = NULL; + struct nd_ifinfo *ndi = NULL; + u_int8_t nullbuf[8]; + + timeout(in6_tmpaddrtimer, (caddr_t)0, (ip6_temp_preferred_lifetime - + ip6_desync_factor - ip6_temp_regen_advance) * hz); + + bzero(nullbuf, sizeof(nullbuf)); + ifnet_head_lock_shared(); + for (ifp = ifnet_head.tqh_first; ifp; + ifp = ifp->if_link.tqe_next) { + ndi = ND_IFINFO(ifp); + if ((NULL == ndi) || (FALSE == ndi->initialized)) { + continue; + } + lck_mtx_lock(&ndi->lock); + if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { + /* + * We've been generating a random ID on this interface. + * Create a new one. + */ + (void) in6_generate_tmp_iid(ndi->randomseed0, + ndi->randomseed1, ndi->randomid); + } + lck_mtx_unlock(&ndi->lock); + } + ifnet_head_done(); +}