/* $OpenBSD: in6_ifattach.c,v 1.7 2000/03/02 09:44:28 itojun Exp $ */ /* $KAME: in6_ifattach.c,v 1.39 2000/03/02 09:24:45 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 static struct in6_addr llsol; 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; int found_first_ifid = 0; #define IFID_LEN 8 static u_int8_t first_ifid[IFID_LEN]; static int laddr_to_eui64 __P((u_int8_t *, u_int8_t *, size_t)); static int gen_rand_eui64 __P((u_int8_t *)); static int laddr_to_eui64(dst, src, len) u_int8_t *dst; u_int8_t *src; size_t len; { static u_int8_t zero[8]; bzero(zero, sizeof(zero)); 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; } 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; { MD5_CTX ctxt; u_int8_t digest[16]; /* generate 8bytes of pseudo-random value. */ bzero(&ctxt, sizeof(ctxt)); MD5Init(&ctxt); MD5Update(&ctxt, hostname, hostnamelen); MD5Final(digest, &ctxt); /* assumes sizeof(digest) > sizeof(first_ifid) */ bcopy(digest, dst, 8); /* make sure to set "u" bit to local, and "g" bit to individual. */ dst[0] &= 0xfe; dst[0] |= 0x02; /* EUI64 "local" */ 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. */ int in6_ifattach_getifid(ifp0) struct ifnet *ifp0; { struct ifnet *ifp; struct ifaddr *ifa; u_int8_t *addr = NULL; int addrlen = 0; struct sockaddr_dl *sdl; if (found_first_ifid) return 0; for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { if (ifp0 != NULL && ifp0 != ifp) continue; 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; 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; } } } #ifdef 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; if (found_first_ifid) { printf("%s: supplying EUI64: " "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", if_name(ifp), first_ifid[0], first_ifid[1], first_ifid[2], first_ifid[3], first_ifid[4], first_ifid[5], first_ifid[6], first_ifid[7]); /* invert u bit to convert EUI64 to RFC2373 interface ID. */ first_ifid[0] ^= 0x02; return 0; } else { #ifdef DEBUG printf("in6_ifattach_getifid: failed to get EUI64"); #endif return EADDRNOTAVAIL; } } /* * XXX multiple loopback interface needs more care. for instance, * nodelocal address needs to be configured onto only one of them. */ void in6_ifattach(ifp, type, laddr, noloop) struct ifnet *ifp; u_int type; caddr_t laddr; /* size_t laddrlen; */ int noloop; { 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, *ib, *oia; struct ifaddr *ifa; int rtflag = 0; 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], first_ifid[1], first_ifid[2], first_ifid[3], first_ifid[4], first_ifid[5], first_ifid[6], first_ifid[7]); /* * invert u bit to convert EUI64 to RFC2373 interface * ID. */ first_ifid[0] ^= 0x02; found_first_ifid = 1; } #endif } if ((ifp->if_flags & IFF_MULTICAST) == 0) { printf("%s: not multicast capable, IPv6 not enabled\n", if_name(ifp)); return; } /* * 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; } /* * To prevent to assign link-local address to PnP network * cards multiple times. * This is lengthy for P2P and LOOP but works. */ 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; } } else { TAILQ_INIT(&ifp->if_addrlist); } /* * 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; 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++; 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); break; case IN6_IFT_802: ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; ia->ia_ifa.ifa_flags |= RTF_CLONING; rtflag = RTF_CLONING; /* fall through */ case IN6_IFT_P2P802: 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; break; case IN6_IFT_P2P: 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; 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_metric = ifp->if_metric; if (ifp->if_ioctl != NULL) { int s; int error; /* * give the interface a chance to initialize, in case this * is the first address to be added. */ s = splimp(); error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); splx(s); 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; } } /* 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) { /* * 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); } /* * loopback address */ 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_ifp = ifp; ia->ia_next = ib; TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ib, ifa_list); ib->ia_ifa.ifa_refcnt++; 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; /* * 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; ib->ia_ifa.ifa_metric = ifp->if_metric; 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); ib->ia_flags |= IFA_ROUTE; } /* * join multicast */ if (ifp->if_flags & IFF_MULTICAST) { int error; /* not used */ /* 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); 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); } 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); } } /* 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); /* 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; } return; } /* * 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; 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); for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = 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; /* leave from all multicast groups joined */ while ((in6m = LIST_FIRST(&oia->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); /* 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 DEBUG else printf("%s: didn't unlink in6ifaddr from " "list\n", if_name(ifp)); #endif } free(ia, M_IFADDR); } /* 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); } }