/* $OpenBSD: in6_ifattach.c,v 1.11 2000/10/02 04:45:03 itojun Exp $ */ /* $KAME: in6_ifattach.c,v 1.67 2000/10/01 10:51:54 itojun Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include 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; static int get_rand_ifid __P((struct ifnet *, struct in6_addr *)); 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_addaddr __P((struct ifnet *, struct in6_ifaddr *)); 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]; #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; } /* * 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: /* IEEE802/EUI64 cases - what others? */ /* 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 /* * mech-06 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) { #ifdef ND6_DEBUG printf("%s: got interface identifier from itself\n", if_name(ifp0)); #endif goto success; } /* try secondary EUI64 source. this basically is for ATM PVC */ if (altifp && get_hw_ifid(altifp, in6) == 0) { #ifdef ND6_DEBUG printf("%s: got interface identifier from %s\n", if_name(ifp0), if_name(altifp)); #endif goto success; } /* next, try to get it from some other hardware interface */ 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)) { #ifdef ND6_DEBUG printf("%s: borrow interface identifier from %s\n", if_name(ifp0), if_name(ifp)); #endif goto success; } } /* last resort: get from random number source */ if (get_rand_ifid(ifp, in6) == 0) { #ifdef ND6_DEBUG printf("%s: interface identifier generated by random number\n", if_name(ifp0)); #endif goto success; } printf("%s: failed to get interface identifier\n", if_name(ifp0)); return -1; success: #ifdef ND6_DEBUG printf("%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]); #endif return 0; } /* * configure IPv6 interface address. XXX code duplicated with in.c */ static int in6_ifattach_addaddr(ifp, ia) struct ifnet *ifp; struct in6_ifaddr *ia; { struct in6_ifaddr *oia; struct ifaddr *ifa; int error; int rtflag; struct in6_addr llsol; /* * initialize if_addrlist, if we are the very first one */ ifa = TAILQ_FIRST(&ifp->if_addrlist); if (ifa == NULL) { TAILQ_INIT(&ifp->if_addrlist); } /* * link the interface address to global list */ TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); ia->ia_ifa.ifa_refcnt++; /* * Also link into the IPv6 address chain beginning with in6_ifaddr. * kazu opposed it, but itojun & jinmei wanted. */ 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++; /* * give the interface a chance to initialize, in case this * is the first address to be added. */ if (ifp->if_ioctl != NULL) { int s; s = splimp(); error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); splx(s); } else 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 */ TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); IFAFREE(&ia->ia_ifa); if (oia) oia->ia_next = ia->ia_next; else in6_ifaddr = ia->ia_next; IFAFREE(&ia->ia_ifa); return -1; } /* configure link-layer address resolution */ rtflag = 0; if (IN6_ARE_ADDR_EQUAL(&ia->ia_prefixmask.sin6_addr, &in6mask128)) rtflag = RTF_HOST; else { switch (ifp->if_type) { case IFT_LOOP: #ifdef IFT_STF case IFT_STF: #endif rtflag = 0; break; default: ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; ia->ia_ifa.ifa_flags |= RTF_CLONING; rtflag = RTF_CLONING; break; } } /* 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 ((rtflag & RTF_CLONING) != 0 && (ifp->if_flags & IFF_MULTICAST) != 0) { /* Restore saved multicast addresses (if any). */ in6_restoremkludge(ia, ifp); /* * 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); /* XXX should we run DAD on other interface types? */ switch (ifp->if_type) { #if 1 case IFT_ARCNET: case IFT_ETHER: case IFT_FDDI: #else default: #endif /* mark the address TENTATIVE, if needed. */ ia->ia6_flags |= IN6_IFF_TENTATIVE; /* nd6_dad_start() will be called in in6_if_up */ } } return 0; } static int in6_ifattach_linklocal(ifp, altifp) struct ifnet *ifp; struct ifnet *altifp; /*secondary EUI64 source*/ { struct in6_ifaddr *ia; /* * configure link-local address */ 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; bzero(&ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); ia->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6); ia->ia_prefixmask.sin6_family = AF_INET6; ia->ia_prefixmask.sin6_addr = in6mask64; /* just in case */ bzero(&ia->ia_dstaddr, sizeof(ia->ia_dstaddr)); ia->ia_dstaddr.sin6_len = sizeof(struct sockaddr_in6); ia->ia_dstaddr.sin6_family = AF_INET6; bzero(&ia->ia_addr, sizeof(ia->ia_addr)); 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; if (ifp->if_flags & IFF_LOOPBACK) { ia->ia_addr.sin6_addr.s6_addr32[2] = 0; ia->ia_addr.sin6_addr.s6_addr32[3] = htonl(1); } else { if (get_ifid(ifp, altifp, &ia->ia_addr.sin6_addr) != 0) { #ifdef ND6_DEBUG printf("%s: no ifid available\n", if_name(ifp)); #endif free(ia, M_IFADDR); return -1; } } ia->ia_ifa.ifa_metric = ifp->if_metric; if (in6_ifattach_addaddr(ifp, ia) != 0) { /* ia will be freed on failure */ return -1; } return 0; } static int in6_ifattach_loopback(ifp) struct ifnet *ifp; /* must be IFT_LOOP */ { struct in6_ifaddr *ia; /* * configure link-local address */ 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; ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; ia->ia_ifp = ifp; bzero(&ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); ia->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6); ia->ia_prefixmask.sin6_family = AF_INET6; ia->ia_prefixmask.sin6_addr = in6mask128; /* * 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. */ bzero(&ia->ia_dstaddr, sizeof(ia->ia_dstaddr)); ia->ia_dstaddr.sin6_len = sizeof(struct sockaddr_in6); ia->ia_dstaddr.sin6_family = AF_INET6; ia->ia_dstaddr.sin6_addr = in6addr_loopback; bzero(&ia->ia_addr, sizeof(ia->ia_addr)); ia->ia_addr.sin6_len = sizeof(struct sockaddr_in6); ia->ia_addr.sin6_family = AF_INET6; ia->ia_addr.sin6_addr = in6addr_loopback; ia->ia_ifa.ifa_metric = ifp->if_metric; if (in6_ifattach_addaddr(ifp, ia) != 0) { /* ia will be freed on failure */ return -1; } return 0; } /* * XXX multiple loopback interface needs more care. for instance, * nodelocal address needs to be configured onto only one of them. * XXX multiple link-local address case */ void in6_ifattach(ifp, altifp) struct ifnet *ifp; struct ifnet *altifp; /* secondary EUI64 source */ { static size_t if_indexlim = 8; struct sockaddr_in6 mltaddr; struct sockaddr_in6 mltmask; struct sockaddr_in6 gate; struct sockaddr_in6 mask; struct in6_ifaddr *ia; struct in6_addr in6; /* * 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; } /* * quirks based on interface type */ switch (ifp->if_type) { #ifdef IFT_STF case IFT_STF: /* * 6to4 interface is a very speical kind of beast. * no multicast, no linklocal (based on 03 draft). */ goto statinit; #endif default: break; } /* * usually, we require multicast capability to the interface */ if ((ifp->if_flags & IFF_MULTICAST) == 0) { printf("%s: not multicast capable, IPv6 not enabled\n", if_name(ifp)); return; } /* * assign link-local address, if there's none */ ia = in6ifa_ifpforlinklocal(ifp, 0); if (ia == NULL) { if (in6_ifattach_linklocal(ifp, altifp) != 0) return; ia = in6ifa_ifpforlinklocal(ifp, 0); if (ia == NULL) { printf("%s: failed to add link-local address\n", if_name(ifp)); /* we can't initialize multicasts without link-local */ goto statinit; } } if (ifp->if_flags & IFF_POINTOPOINT) { /* * route local address to loopback */ 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); } /* * assign loopback address for loopback interface * XXX multiple loopback interface case */ in6 = in6addr_loopback; if (ifp->if_flags & IFF_LOOPBACK) { if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { if (in6_ifattach_loopback(ifp) != 0) return; } } #ifdef DIAGNOSTIC if (!ia) { panic("ia == NULL in in6_ifattach"); /*NOTREACHED*/ } #endif /* * join multicast */ if (ifp->if_flags & IFF_MULTICAST) { int error; /* not used */ struct in6_multi *in6m; /* Restore saved multicast addresses(if any). */ in6_restoremkludge(ia, ifp); bzero(&mltmask, sizeof(mltmask)); mltmask.sin6_len = sizeof(struct sockaddr_in6); mltmask.sin6_family = AF_INET6; mltmask.sin6_addr = in6mask32; /* * 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); IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); if (in6m == NULL) { 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 (ifp->if_flags & IFF_LOOPBACK) { in6 = in6addr_loopback; ia = in6ifa_ifpwithaddr(ifp, &in6); /* * join node-local all-nodes address, on loopback */ mltaddr.sin6_addr = in6addr_nodelocal_allnodes; IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); if (in6m == NULL && ia != NULL) { rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr, (struct sockaddr *)&ia->ia_addr, (struct sockaddr *)&mltmask, RTF_UP, (struct rtentry **)0); (void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error); } } } statinit:; /* 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. */ 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; /* 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, ifp); } /* undo everything done by in6_ifattach(), just in case */ for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = 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; /* leave from all multicast groups joined */ while ((in6m = LIST_FIRST(&ia->ia6_multiaddrs)) != NULL) in6_delmulti(in6m); /* 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, (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; #ifdef ND6_DEBUG else printf("%s: didn't unlink in6ifaddr from " "list\n", if_name(ifp)); #endif } IFAFREE(&oia->ia_ifa); } /* cleanup multicast address kludge table, if there is any */ in6_purgemkludge(ifp); /* remove neighbor management table */ 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); if ((rt = rtalloc1((struct sockaddr *)&sin6, 0)) != NULL) { rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); rtfree(rt); } }