/* $OpenBSD: in6.c,v 1.30 2001/12/07 09:16:07 itojun Exp $ */ /* $KAME: in6.c,v 1.198 2001/07/18 09:12:38 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. */ /* * Copyright (c) 1982, 1986, 1991, 1993 * The Regents of the University of California. 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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. * * @(#)in.c 8.2 (Berkeley) 11/15/93 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* backward compatibility for a while... */ #define COMPAT_IN6IFIOCTL /* * Definitions of some costant IP6 addresses. */ const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; const struct in6_addr in6addr_nodelocal_allnodes = IN6ADDR_NODELOCAL_ALLNODES_INIT; const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; const struct in6_addr in6mask0 = IN6MASK0; const struct in6_addr in6mask32 = IN6MASK32; const struct in6_addr in6mask64 = IN6MASK64; const struct in6_addr in6mask96 = IN6MASK96; const struct in6_addr in6mask128 = IN6MASK128; static int in6_lifaddr_ioctl __P((struct socket *, u_long, caddr_t, struct ifnet *, struct proc *)); const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0}; /* * This structure is used to keep track of in6_multi chains which belong to * deleted interface addresses. */ static LIST_HEAD(, multi6_kludge) in6_mk; /* XXX BSS initialization */ struct multi6_kludge { LIST_ENTRY(multi6_kludge) mk_entry; struct ifnet *mk_ifp; struct in6_multihead mk_head; }; /* * Check if the loopback entry will be automatically generated. * if 0 returned, will not be automatically generated. * if 1 returned, will be automatically generated. */ static int in6_is_ifloop_auto(struct ifaddr *ifa) { return 0; } /* * Subroutine for in6_ifaddloop() and in6_ifremloop(). * This routine does actual work. */ static void in6_ifloop_request(int cmd, struct ifaddr *ifa) { struct sockaddr_in6 lo_sa; struct sockaddr_in6 all1_sa; struct rtentry *nrt = NULL, **nrtp = NULL; bzero(&lo_sa, sizeof(lo_sa)); bzero(&all1_sa, sizeof(all1_sa)); lo_sa.sin6_family = AF_INET6; lo_sa.sin6_len = sizeof(struct sockaddr_in6); all1_sa = lo_sa; lo_sa.sin6_addr = in6addr_loopback; all1_sa.sin6_addr = in6mask128; /* * So we add or remove static loopback entry, here. * This request for deletion could fail, e.g. when we remove * an address right after adding it. */ if (cmd == RTM_ADD) nrtp = &nrt; rtrequest(cmd, ifa->ifa_addr, (struct sockaddr *)&lo_sa, (struct sockaddr *)&all1_sa, RTF_UP|RTF_HOST, nrtp); /* * Make sure rt_ifa be equal to IFA, the second argument of the * function. * We need this because when we refer to rt_ifa->ia6_flags in * ip6_input, we assume that the rt_ifa points to the address instead * of the loopback address. */ if (cmd == RTM_ADD && nrt && ifa != nrt->rt_ifa) { IFAFREE(nrt->rt_ifa); ifa->ifa_refcnt++; nrt->rt_ifa = ifa; } if (nrt) nrt->rt_refcnt--; } /* * Add ownaddr as loopback rtentry, if necessary(ex. on p2p link). * Because, KAME needs loopback rtentry for ownaddr check in * ip6_input(). */ static void in6_ifaddloop(struct ifaddr *ifa) { if (!in6_is_ifloop_auto(ifa)) { struct rtentry *rt; /* If there is no loopback entry, allocate one. */ rt = rtalloc1(ifa->ifa_addr, 0); if (rt == 0 || (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) in6_ifloop_request(RTM_ADD, ifa); if (rt) rt->rt_refcnt--; } } /* * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(), * if it exists. */ static void in6_ifremloop(struct ifaddr *ifa) { if (!in6_is_ifloop_auto(ifa)) { struct in6_ifaddr *ia; int ia_count = 0; /* If only one ifa for the loopback entry, delete it. */ for (ia = in6_ifaddr; ia; ia = ia->ia_next) { if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) { ia_count++; if (ia_count > 1) break; } } if (ia_count == 1) in6_ifloop_request(RTM_DELETE, ifa); } } int in6_ifindex2scopeid(idx) int idx; { struct ifnet *ifp; struct ifaddr *ifa; struct sockaddr_in6 *sin6; if (idx < 0 || if_index < idx) return -1; ifp = ifindex2ifnet[idx]; for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) return sin6->sin6_scope_id & 0xffff; } return -1; } int in6_mask2len(mask) struct in6_addr *mask; { int x, y; for (x = 0; x < sizeof(*mask); x++) { if (mask->s6_addr8[x] != 0xff) break; } y = 0; if (x < sizeof(*mask)) { for (y = 0; y < 8; y++) { if ((mask->s6_addr8[x] & (0x80 >> y)) == 0) break; } } return x * 8 + y; } void in6_len2mask(mask, len) struct in6_addr *mask; int len; { int i; bzero(mask, sizeof(*mask)); for (i = 0; i < len / 8; i++) mask->s6_addr8[i] = 0xff; if (len % 8) mask->s6_addr8[i] = (0xff00 >> (len % 8)) & 0xff; } #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) #define ia62ifa(ia6) (&((ia6)->ia_ifa)) int in6_control(so, cmd, data, ifp, p) struct socket *so; u_long cmd; caddr_t data; struct ifnet *ifp; struct proc *p; { struct in6_ifreq *ifr = (struct in6_ifreq *)data; struct in6_ifaddr *ia, *oia; struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; struct sockaddr_in6 oldaddr; #ifdef COMPAT_IN6IFIOCTL struct sockaddr_in6 net; #endif int error = 0, hostIsNew, prefixIsNew; int newifaddr; time_t time_second = (time_t)time.tv_sec; int privileged; privileged = 0; if ((so->so_state & SS_PRIV) != 0) privileged++; switch (cmd) { case SIOCGETSGCNT_IN6: case SIOCGETMIFCNT_IN6: return (mrt6_ioctl(cmd, data)); } if (ifp == 0) return(EOPNOTSUPP); switch (cmd) { case SIOCSNDFLUSH_IN6: case SIOCSPFXFLUSH_IN6: case SIOCSRTRFLUSH_IN6: case SIOCSDEFIFACE_IN6: case SIOCSIFINFO_FLAGS: if (!privileged) return(EPERM); /*fall through*/ case SIOCGIFINFO_IN6: case SIOCGDRLST_IN6: case SIOCGPRLST_IN6: case SIOCGNBRINFO_IN6: case SIOCGDEFIFACE_IN6: return(nd6_ioctl(cmd, data, ifp)); } switch (cmd) { case SIOCSIFPREFIX_IN6: case SIOCDIFPREFIX_IN6: case SIOCAIFPREFIX_IN6: case SIOCCIFPREFIX_IN6: case SIOCSGIFPREFIX_IN6: if (!privileged) return(EPERM); /*fall through*/ case SIOCGIFPREFIX_IN6: return(in6_prefix_ioctl(so, cmd, data, ifp)); } switch (cmd) { case SIOCALIFADDR: case SIOCDLIFADDR: if (!privileged) return(EPERM); /*fall through*/ case SIOCGLIFADDR: return in6_lifaddr_ioctl(so, cmd, data, ifp, p); } /* * Find address for this interface, if it exists. */ if (ifra->ifra_addr.sin6_family == AF_INET6) { /* XXX */ struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)&ifra->ifra_addr; if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) { if (sa6->sin6_addr.s6_addr16[1] == 0) { /* interface ID is not embedded by the user */ sa6->sin6_addr.s6_addr16[1] = htons(ifp->if_index); } else if (sa6->sin6_addr.s6_addr16[1] != htons(ifp->if_index)) { return(EINVAL); /* ifid contradicts */ } if (sa6->sin6_scope_id) { if (sa6->sin6_scope_id != (u_int32_t)ifp->if_index) return(EINVAL); sa6->sin6_scope_id = 0; /* XXX: good way? */ } } ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr); } switch (cmd) { case SIOCDIFADDR_IN6: /* * for IPv4, we look for existing in_ifaddr here to allow * "ifconfig if0 delete" to remove first IPv4 address on the * interface. For IPv6, as the spec allow multiple interface * address from the day one, we consider "remove the first one" * semantics to be not preferable. */ if (ia == NULL) return(EADDRNOTAVAIL); /* FALLTHROUGH */ case SIOCAIFADDR_IN6: case SIOCSIFADDR_IN6: #ifdef COMPAT_IN6IFIOCTL case SIOCSIFDSTADDR_IN6: case SIOCSIFNETMASK_IN6: /* * Since IPv6 allows a node to assign multiple addresses * on a single interface, SIOCSIFxxx ioctls are not suitable * and should be unused. */ #endif if (ifra->ifra_addr.sin6_family != AF_INET6) return(EAFNOSUPPORT); if (!privileged) return(EPERM); if (ia == NULL) { ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, M_WAITOK); bzero((caddr_t)ia, sizeof(*ia)); /* Initialize the address and masks */ ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; ia->ia_addr.sin6_family = AF_INET6; ia->ia_addr.sin6_len = sizeof(ia->ia_addr); if (ifp->if_flags & IFF_POINTOPOINT) { ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; ia->ia_dstaddr.sin6_family = AF_INET6; ia->ia_dstaddr.sin6_len = sizeof(ia->ia_dstaddr); } else { ia->ia_ifa.ifa_dstaddr = NULL; bzero(&ia->ia_dstaddr, sizeof(ia->ia_dstaddr)); } ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; ia->ia_ifp = ifp; 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++; TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); ia->ia_ifa.ifa_refcnt++; newifaddr = 1; } else newifaddr = 0; if (cmd == SIOCAIFADDR_IN6) { /* sanity for overflow - beware unsigned */ struct in6_addrlifetime *lt; lt = &ifra->ifra_lifetime; if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME && lt->ia6t_vltime + time_second < time_second) { return EINVAL; } if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME && lt->ia6t_pltime + time_second < time_second) { return EINVAL; } } break; case SIOCGIFADDR_IN6: /* This interface is basically deprecated. use SIOCGIFCONF. */ /* fall through */ case SIOCGIFAFLAG_IN6: case SIOCGIFNETMASK_IN6: case SIOCGIFDSTADDR_IN6: case SIOCGIFALIFETIME_IN6: /* must think again about its semantics */ if (ia == NULL) return(EADDRNOTAVAIL); break; case SIOCSIFALIFETIME_IN6: { struct in6_addrlifetime *lt; if (!privileged) return(EPERM); if (ia == NULL) return(EADDRNOTAVAIL); /* sanity for overflow - beware unsigned */ lt = &ifr->ifr_ifru.ifru_lifetime; if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME && lt->ia6t_vltime + time_second < time_second) { return EINVAL; } if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME && lt->ia6t_pltime + time_second < time_second) { return EINVAL; } break; } } switch (cmd) { case SIOCGIFADDR_IN6: ifr->ifr_addr = ia->ia_addr; break; case SIOCGIFDSTADDR_IN6: if ((ifp->if_flags & IFF_POINTOPOINT) == 0) return(EINVAL); ifr->ifr_dstaddr = ia->ia_dstaddr; break; case SIOCGIFNETMASK_IN6: ifr->ifr_addr = ia->ia_prefixmask; break; case SIOCGIFAFLAG_IN6: ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; break; case SIOCGIFSTAT_IN6: if (ifp == NULL) return EINVAL; if (in6_ifstat == NULL || ifp->if_index >= in6_ifstatmax || in6_ifstat[ifp->if_index] == NULL) { /* return EAFNOSUPPORT? */ bzero(&ifr->ifr_ifru.ifru_stat, sizeof(ifr->ifr_ifru.ifru_stat)); } else ifr->ifr_ifru.ifru_stat = *in6_ifstat[ifp->if_index]; break; case SIOCGIFSTAT_ICMP6: if (ifp == NULL) return EINVAL; if (icmp6_ifstat == NULL || ifp->if_index >= icmp6_ifstatmax || icmp6_ifstat[ifp->if_index] == NULL) { /* return EAFNOSUPPORT? */ bzero(&ifr->ifr_ifru.ifru_stat, sizeof(ifr->ifr_ifru.ifru_icmp6stat)); } else ifr->ifr_ifru.ifru_icmp6stat = *icmp6_ifstat[ifp->if_index]; break; #ifdef COMPAT_IN6IFIOCTL /* should be unused */ case SIOCSIFDSTADDR_IN6: if ((ifp->if_flags & IFF_POINTOPOINT) == 0) return(EINVAL); oldaddr = ia->ia_dstaddr; ia->ia_dstaddr = ifr->ifr_dstaddr; /* link-local index check */ if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_dstaddr.sin6_addr)) { if (ia->ia_dstaddr.sin6_addr.s6_addr16[1] == 0) { /* interface ID is not embedded by the user */ ia->ia_dstaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); } else if (ia->ia_dstaddr.sin6_addr.s6_addr16[1] != htons(ifp->if_index)) { ia->ia_dstaddr = oldaddr; return(EINVAL); /* ifid contradicts */ } } if (ifp->if_ioctl && (error = (ifp->if_ioctl) (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) { ia->ia_dstaddr = oldaddr; return(error); } if (ia->ia_flags & IFA_ROUTE) { ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); } break; #endif case SIOCGIFALIFETIME_IN6: ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; break; case SIOCSIFALIFETIME_IN6: ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; /* for sanity */ if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { ia->ia6_lifetime.ia6t_expire = time_second + ia->ia6_lifetime.ia6t_vltime; } else ia->ia6_lifetime.ia6t_expire = 0; if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { ia->ia6_lifetime.ia6t_preferred = time_second + ia->ia6_lifetime.ia6t_pltime; } else ia->ia6_lifetime.ia6t_preferred = 0; break; case SIOCSIFADDR_IN6: error = in6_ifinit(ifp, ia, &ifr->ifr_addr, 1); #if 0 /* * the code chokes if we are to assign multiple addresses with * the same address prefix (rtinit() will return EEXIST, which * is not fatal actually). we will get memory leak if we * don't do it. * -> we may want to hide EEXIST from rtinit(). */ undo: if (error && newifaddr) { TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list); IFAFREE(&ia->ia_ifa); 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 { printf("Didn't unlink in6_ifaddr " "from list\n"); } } IFAFREE(&oia->ia_ifa); } #endif return error; #ifdef COMPAT_IN6IFIOCTL /* XXX should be unused */ case SIOCSIFNETMASK_IN6: ia->ia_prefixmask = ifr->ifr_addr; bzero(&net, sizeof(net)); net.sin6_len = sizeof(struct sockaddr_in6); net.sin6_family = AF_INET6; net.sin6_port = htons(0); net.sin6_flowinfo = htonl(0); net.sin6_addr.s6_addr32[0] = ia->ia_addr.sin6_addr.s6_addr32[0] & ia->ia_prefixmask.sin6_addr.s6_addr32[0]; net.sin6_addr.s6_addr32[1] = ia->ia_addr.sin6_addr.s6_addr32[1] & ia->ia_prefixmask.sin6_addr.s6_addr32[1]; net.sin6_addr.s6_addr32[2] = ia->ia_addr.sin6_addr.s6_addr32[2] & ia->ia_prefixmask.sin6_addr.s6_addr32[2]; net.sin6_addr.s6_addr32[3] = ia->ia_addr.sin6_addr.s6_addr32[3] & ia->ia_prefixmask.sin6_addr.s6_addr32[3]; ia->ia_net = net; break; #endif case SIOCAIFADDR_IN6: prefixIsNew = 0; hostIsNew = 1; if (ifra->ifra_addr.sin6_len == 0) { ifra->ifra_addr = ia->ia_addr; hostIsNew = 0; } else if (IN6_ARE_ADDR_EQUAL(&ifra->ifra_addr.sin6_addr, &ia->ia_addr.sin6_addr)) hostIsNew = 0; /* Validate address families: */ /* * The destination address for a p2p link must have a family * of AF_UNSPEC or AF_INET6. */ if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && ifra->ifra_dstaddr.sin6_family != AF_INET6 && ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) return(EAFNOSUPPORT); /* * The prefixmask must have a family of AF_UNSPEC or AF_INET6. */ if (ifra->ifra_prefixmask.sin6_family != AF_INET6 && ifra->ifra_prefixmask.sin6_family != AF_UNSPEC) return(EAFNOSUPPORT); if (ifra->ifra_prefixmask.sin6_len) { in6_ifscrub(ifp, ia); ia->ia_prefixmask = ifra->ifra_prefixmask; prefixIsNew = 1; } if ((ifp->if_flags & IFF_POINTOPOINT) && (ifra->ifra_dstaddr.sin6_family == AF_INET6)) { in6_ifscrub(ifp, ia); oldaddr = ia->ia_dstaddr; ia->ia_dstaddr = ifra->ifra_dstaddr; /* link-local index check: should be a separate function? */ if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_dstaddr.sin6_addr)) { if (ia->ia_dstaddr.sin6_addr.s6_addr16[1] == 0) { /* * interface ID is not embedded by * the user */ ia->ia_dstaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); } else if (ia->ia_dstaddr.sin6_addr.s6_addr16[1] != htons(ifp->if_index)) { ia->ia_dstaddr = oldaddr; return(EINVAL); /* ifid contradicts */ } } prefixIsNew = 1; /* We lie; but effect's the same */ } if (hostIsNew || prefixIsNew) { error = in6_ifinit(ifp, ia, &ifra->ifra_addr, 0); #if 0 if (error) goto undo; #endif } if (hostIsNew && (ifp->if_flags & IFF_MULTICAST)) { int error_local = 0; /* * join solicited multicast addr for new host id */ struct in6_addr llsol; bzero(&llsol, sizeof(struct in6_addr)); 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] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; llsol.s6_addr8[12] = 0xff; (void)in6_addmulti(&llsol, ifp, &error_local); if (error == 0) error = error_local; } ia->ia6_flags = ifra->ifra_flags; ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /*safety*/ ia->ia6_lifetime = ifra->ifra_lifetime; /* for sanity */ if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { ia->ia6_lifetime.ia6t_expire = time_second + ia->ia6_lifetime.ia6t_vltime; } else ia->ia6_lifetime.ia6t_expire = 0; if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { ia->ia6_lifetime.ia6t_preferred = time_second + ia->ia6_lifetime.ia6t_pltime; } else ia->ia6_lifetime.ia6t_preferred = 0; /* * make sure to initialize ND6 information. this is to * workaround issues with interfaces with IPv6 addresses, * which have never brought # up. we are assuming that it is * safe to nd6_ifattach multiple times. */ nd6_ifattach(ifp); /* * Perform DAD, if needed. * XXX It may be of use, if we can administratively * disable DAD. */ 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((struct ifaddr *)ia, NULL); break; case IFT_DUMMY: case IFT_FAITH: case IFT_GIF: case IFT_LOOP: default: break; } if (hostIsNew) { int iilen; int error_local = 0; iilen = (sizeof(ia->ia_prefixmask.sin6_addr) << 3) - in6_mask2len(&ia->ia_prefixmask.sin6_addr); error_local = in6_prefix_add_ifid(iilen, ia); if (error == 0) error = error_local; } return(error); case SIOCDIFADDR_IN6: in6_purgeaddr(&ia->ia_ifa, ifp); break; default: if (ifp == NULL || ifp->if_ioctl == 0) return(EOPNOTSUPP); return((*ifp->if_ioctl)(ifp, cmd, data)); } return(0); } void in6_purgeaddr(ifa, ifp) struct ifaddr *ifa; struct ifnet *ifp; { struct in6_ifaddr *oia, *ia = (void *) ifa; /* stop DAD processing */ nd6_dad_stop(ifa); in6_ifscrub(ifp, ia); if (ifp->if_flags & IFF_MULTICAST) { /* * delete solicited multicast addr for deleting host id */ struct in6_multi *in6m; struct in6_addr llsol; bzero(&llsol, sizeof(struct in6_addr)); 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; IN6_LOOKUP_MULTI(llsol, ifp, in6m); if (in6m) in6_delmulti(in6m); } TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list); IFAFREE(&ia->ia_ifa); 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 printf("Didn't unlink in6_ifaddr from list\n"); } { int iilen; iilen = (sizeof(oia->ia_prefixmask.sin6_addr) << 3) - in6_mask2len(&oia->ia_prefixmask.sin6_addr); in6_prefix_remove_ifid(iilen, oia); } if (oia->ia6_multiaddrs.lh_first != NULL) in6_savemkludge(oia); IFAFREE(&oia->ia_ifa); } /* * SIOC[GAD]LIFADDR. * SIOCGLIFADDR: get first address. (?) * SIOCGLIFADDR with IFLR_PREFIX: * get first address that matches the specified prefix. * SIOCALIFADDR: add the specified address. * SIOCALIFADDR with IFLR_PREFIX: * add the specified prefix, filling hostid part from * the first link-local address. prefixlen must be <= 64. * SIOCDLIFADDR: delete the specified address. * SIOCDLIFADDR with IFLR_PREFIX: * delete the first address that matches the specified prefix. * return values: * EINVAL on invalid parameters * EADDRNOTAVAIL on prefix match failed/specified address not found * other values may be returned from in6_ioctl() * * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. * this is to accomodate address naming scheme other than RFC2374, * in the future. * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 * address encoding scheme. (see figure on page 8) */ static int in6_lifaddr_ioctl(so, cmd, data, ifp, p) struct socket *so; u_long cmd; caddr_t data; struct ifnet *ifp; struct proc *p; { struct if_laddrreq *iflr = (struct if_laddrreq *)data; struct ifaddr *ifa; struct sockaddr *sa; /* sanity checks */ if (!data || !ifp) { panic("invalid argument to in6_lifaddr_ioctl"); /* NOTREACHED */ } switch (cmd) { case SIOCGLIFADDR: /* address must be specified on GET with IFLR_PREFIX */ if ((iflr->flags & IFLR_PREFIX) == 0) break; /* FALLTHROUGH */ case SIOCALIFADDR: case SIOCDLIFADDR: /* address must be specified on ADD and DELETE */ sa = (struct sockaddr *)&iflr->addr; if (sa->sa_family != AF_INET6) return EINVAL; if (sa->sa_len != sizeof(struct sockaddr_in6)) return EINVAL; /* XXX need improvement */ sa = (struct sockaddr *)&iflr->dstaddr; if (sa->sa_family && sa->sa_family != AF_INET6) return EINVAL; if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) return EINVAL; break; default: /* shouldn't happen */ #if 0 panic("invalid cmd to in6_lifaddr_ioctl"); /* NOTREACHED */ #else return EOPNOTSUPP; #endif } if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) return EINVAL; switch (cmd) { case SIOCALIFADDR: { struct in6_aliasreq ifra; struct in6_addr *hostid = NULL; int prefixlen; if ((iflr->flags & IFLR_PREFIX) != 0) { struct sockaddr_in6 *sin6; /* * hostid is to fill in the hostid part of the * address. hostid points to the first link-local * address attached to the interface. */ ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); if (!ifa) return EADDRNOTAVAIL; hostid = IFA_IN6(ifa); /* prefixlen must be <= 64. */ if (64 < iflr->prefixlen) return EINVAL; prefixlen = iflr->prefixlen; /* hostid part must be zero. */ sin6 = (struct sockaddr_in6 *)&iflr->addr; if (sin6->sin6_addr.s6_addr32[2] != 0 || sin6->sin6_addr.s6_addr32[3] != 0) { return EINVAL; } } else prefixlen = iflr->prefixlen; /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ bzero(&ifra, sizeof(ifra)); bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); bcopy(&iflr->addr, &ifra.ifra_addr, ((struct sockaddr *)&iflr->addr)->sa_len); if (hostid) { /* fill in hostid part */ ifra.ifra_addr.sin6_addr.s6_addr32[2] = hostid->s6_addr32[2]; ifra.ifra_addr.sin6_addr.s6_addr32[3] = hostid->s6_addr32[3]; } if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/ bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, ((struct sockaddr *)&iflr->dstaddr)->sa_len); if (hostid) { ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = hostid->s6_addr32[2]; ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = hostid->s6_addr32[3]; } } ifra.ifra_prefixmask.sin6_family = AF_INET6; ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); in6_len2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, p); } case SIOCGLIFADDR: case SIOCDLIFADDR: { struct in6_ifaddr *ia; struct in6_addr mask, candidate, match; struct sockaddr_in6 *sin6; int cmp; bzero(&mask, sizeof(mask)); if (iflr->flags & IFLR_PREFIX) { /* lookup a prefix rather than address. */ in6_len2mask(&mask, iflr->prefixlen); sin6 = (struct sockaddr_in6 *)&iflr->addr; bcopy(&sin6->sin6_addr, &match, sizeof(match)); match.s6_addr32[0] &= mask.s6_addr32[0]; match.s6_addr32[1] &= mask.s6_addr32[1]; match.s6_addr32[2] &= mask.s6_addr32[2]; match.s6_addr32[3] &= mask.s6_addr32[3]; /* if you set extra bits, that's wrong */ if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) return EINVAL; cmp = 1; } else { if (cmd == SIOCGLIFADDR) { /* on getting an address, take the 1st match */ cmp = 0; /*XXX*/ } else { /* on deleting an address, do exact match */ in6_len2mask(&mask, 128); sin6 = (struct sockaddr_in6 *)&iflr->addr; bcopy(&sin6->sin6_addr, &match, sizeof(match)); cmp = 1; } } for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; if (!cmp) break; bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); candidate.s6_addr32[0] &= mask.s6_addr32[0]; candidate.s6_addr32[1] &= mask.s6_addr32[1]; candidate.s6_addr32[2] &= mask.s6_addr32[2]; candidate.s6_addr32[3] &= mask.s6_addr32[3]; if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) break; } if (!ifa) return EADDRNOTAVAIL; ia = ifa2ia6(ifa); if (cmd == SIOCGLIFADDR) { /* fill in the if_laddrreq structure */ bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { bcopy(&ia->ia_dstaddr, &iflr->dstaddr, ia->ia_dstaddr.sin6_len); } else bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); iflr->prefixlen = in6_mask2len(&ia->ia_prefixmask.sin6_addr); iflr->flags = ia->ia6_flags; /*XXX*/ return 0; } else { struct in6_aliasreq ifra; /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ bzero(&ifra, sizeof(ifra)); bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); bcopy(&ia->ia_addr, &ifra.ifra_addr, ia->ia_addr.sin6_len); if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, ia->ia_dstaddr.sin6_len); } else { bzero(&ifra.ifra_dstaddr, sizeof(ifra.ifra_dstaddr)); } bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, ia->ia_prefixmask.sin6_len); ifra.ifra_flags = ia->ia6_flags; return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, ifp, p); } } } return EOPNOTSUPP; /*just for safety*/ } /* * Delete any existing route for an interface. */ void in6_ifscrub(ifp, ia) struct ifnet *ifp; struct in6_ifaddr *ia; { if ((ia->ia_flags & IFA_ROUTE) == 0) return; /* * We should check the existence of dstaddr, because link-local * addresses can be configured without particular destinations * even on point-to-point or loopback interfaces. * In this case, kernel would panic in rtinit()... */ if (ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT) && (ia->ia_ifa.ifa_dstaddr != NULL)) rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); else rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0); ia->ia_flags &= ~IFA_ROUTE; /* Remove ownaddr's loopback rtentry, if it exists. */ in6_ifremloop(&(ia->ia_ifa)); } /* * Initialize an interface's intetnet6 address * and routing table entry. */ int in6_ifinit(ifp, ia, sin6, scrub) struct ifnet *ifp; struct in6_ifaddr *ia; struct sockaddr_in6 *sin6; int scrub; { struct sockaddr_in6 oldaddr; int error, flags = RTF_UP; int s = splimp(); oldaddr = ia->ia_addr; ia->ia_addr = *sin6; /* * Give the interface a chance to initialize * if this is its first address, * and to validate the address if necessary. */ if (ifp->if_ioctl && (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) { splx(s); ia->ia_addr = oldaddr; return(error); } switch (ifp->if_type) { case IFT_ARCNET: case IFT_ETHER: case IFT_FDDI: ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; ia->ia_ifa.ifa_flags |= RTF_CLONING; break; case IFT_PPP: ia->ia_ifa.ifa_rtrequest = nd6_p2p_rtrequest; ia->ia_ifa.ifa_flags |= RTF_CLONING; break; } splx(s); if (scrub) { ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; in6_ifscrub(ifp, ia); ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; } /* xxx * in_socktrim */ /* * Add route for the network. */ ia->ia_ifa.ifa_metric = ifp->if_metric; if (ifp->if_flags & IFF_LOOPBACK) { ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; flags |= RTF_HOST; } else if (ifp->if_flags & IFF_POINTOPOINT) { if (ia->ia_dstaddr.sin6_family != AF_INET6) return(0); flags |= RTF_HOST; } if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, flags)) == 0) ia->ia_flags |= IFA_ROUTE; /* Add ownaddr as loopback rtentry, if necessary(ex. on p2p link). */ in6_ifaddloop(&(ia->ia_ifa)); if (ifp->if_flags & IFF_MULTICAST) in6_restoremkludge(ia, ifp); return(error); } /* * Multicast address kludge: * If there were any multicast addresses attached to this interface address, * either move them to another address on this interface, or save them until * such time as this interface is reconfigured for IPv6. */ void in6_savemkludge(oia) struct in6_ifaddr *oia; { struct in6_ifaddr *ia; struct in6_multi *in6m, *next; IFP_TO_IA6(oia->ia_ifp, ia); if (ia) { /* there is another address */ for (in6m = oia->ia6_multiaddrs.lh_first; in6m; in6m = next){ next = in6m->in6m_entry.le_next; IFAFREE(&in6m->in6m_ia->ia_ifa); ia->ia_ifa.ifa_refcnt++; in6m->in6m_ia = ia; LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry); } } else { /* last address on this if deleted, save */ struct multi6_kludge *mk; for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) { if (mk->mk_ifp == oia->ia_ifp) break; } if (mk == NULL) /* this should not happen! */ panic("in6_savemkludge: no kludge space"); for (in6m = oia->ia6_multiaddrs.lh_first; in6m; in6m = next){ next = in6m->in6m_entry.le_next; IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */ in6m->in6m_ia = NULL; LIST_INSERT_HEAD(&mk->mk_head, in6m, in6m_entry); } } } /* * Continuation of multicast address hack: * If there was a multicast group list previously saved for this interface, * then we re-attach it to the first address configured on the i/f. */ void in6_restoremkludge(ia, ifp) struct in6_ifaddr *ia; struct ifnet *ifp; { struct multi6_kludge *mk; for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) { if (mk->mk_ifp == ifp) { struct in6_multi *in6m, *next; for (in6m = mk->mk_head.lh_first; in6m; in6m = next) { next = in6m->in6m_entry.le_next; in6m->in6m_ia = ia; ia->ia_ifa.ifa_refcnt++; LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry); } LIST_INIT(&mk->mk_head); break; } } } /* * Allocate space for the kludge at interface initialization time. * Formerly, we dynamically allocated the space in in6_savemkludge() with * malloc(M_WAITOK). However, it was wrong since the function could be called * under an interrupt context (software timer on address lifetime expiration). * Also, we cannot just give up allocating the strucutre, since the group * membership structure is very complex and we need to keep it anyway. * Of course, this function MUST NOT be called under an interrupt context. * Specifically, it is expected to be called only from in6_ifattach(), though * it is a global function. */ void in6_createmkludge(ifp) struct ifnet *ifp; { struct multi6_kludge *mk; for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) { /* If we've already had one, do not allocate. */ if (mk->mk_ifp == ifp) return; } mk = malloc(sizeof(*mk), M_IPMADDR, M_WAITOK); bzero(mk, sizeof(*mk)); LIST_INIT(&mk->mk_head); mk->mk_ifp = ifp; LIST_INSERT_HEAD(&in6_mk, mk, mk_entry); } void in6_purgemkludge(ifp) struct ifnet *ifp; { struct multi6_kludge *mk; struct in6_multi *in6m; for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) { if (mk->mk_ifp != ifp) continue; /* leave from all multicast groups joined */ while ((in6m = LIST_FIRST(&mk->mk_head)) != NULL) in6_delmulti(in6m); LIST_REMOVE(mk, mk_entry); free(mk, M_IPMADDR); break; } } /* * Add an address to the list of IP6 multicast addresses for a * given interface. */ struct in6_multi * in6_addmulti(maddr6, ifp, errorp) struct in6_addr *maddr6; struct ifnet *ifp; int *errorp; { struct in6_ifaddr *ia; struct in6_ifreq ifr; struct in6_multi *in6m; int s = splnet(); *errorp = 0; /* * See if address already in list. */ IN6_LOOKUP_MULTI(*maddr6, ifp, in6m); if (in6m != NULL) { /* * Found it; just increment the refrence count. */ in6m->in6m_refcount++; } else { /* * New address; allocate a new multicast record * and link it into the interface's multicast list. */ in6m = (struct in6_multi *) malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT); if (in6m == NULL) { splx(s); *errorp = ENOBUFS; return(NULL); } in6m->in6m_addr = *maddr6; in6m->in6m_ifp = ifp; in6m->in6m_refcount = 1; IFP_TO_IA6(ifp, ia); if (ia == NULL) { free(in6m, M_IPMADDR); splx(s); *errorp = EADDRNOTAVAIL; /* appropriate? */ return(NULL); } in6m->in6m_ia = ia; ia->ia_ifa.ifa_refcnt++; /* gain a reference */ LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry); /* * Ask the network driver to update its multicast reception * filter appropriately for the new address. */ bzero(&ifr.ifr_addr, sizeof(struct sockaddr_in6)); ifr.ifr_addr.sin6_len = sizeof(struct sockaddr_in6); ifr.ifr_addr.sin6_family = AF_INET6; ifr.ifr_addr.sin6_addr = *maddr6; if (ifp->if_ioctl == NULL) *errorp = ENXIO; /* XXX: appropriate? */ else *errorp = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); if (*errorp) { LIST_REMOVE(in6m, in6m_entry); free(in6m, M_IPMADDR); IFAFREE(&ia->ia_ifa); splx(s); return(NULL); } /* * Let MLD6 know that we have joined a new IP6 multicast * group. */ mld6_start_listening(in6m); } splx(s); return(in6m); } /* * Delete a multicast address record. */ void in6_delmulti(in6m) struct in6_multi *in6m; { struct in6_ifreq ifr; int s = splnet(); if (--in6m->in6m_refcount == 0) { /* * No remaining claims to this record; let MLD6 know * that we are leaving the multicast group. */ mld6_stop_listening(in6m); /* * Unlink from list. */ LIST_REMOVE(in6m, in6m_entry); if (in6m->in6m_ia) { IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */ } /* * Notify the network driver to update its multicast * reception filter. */ bzero(&ifr.ifr_addr, sizeof(struct sockaddr_in6)); ifr.ifr_addr.sin6_len = sizeof(struct sockaddr_in6); ifr.ifr_addr.sin6_family = AF_INET6; ifr.ifr_addr.sin6_addr = in6m->in6m_addr; (*in6m->in6m_ifp->if_ioctl)(in6m->in6m_ifp, SIOCDELMULTI, (caddr_t)&ifr); free(in6m, M_IPMADDR); } splx(s); } /* * Find an IPv6 interface link-local address specific to an interface. */ struct in6_ifaddr * in6ifa_ifpforlinklocal(ifp, ignoreflags) struct ifnet *ifp; int ignoreflags; { struct ifaddr *ifa; for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { if (ifa->ifa_addr == NULL) continue; /* just for safety */ if (ifa->ifa_addr->sa_family != AF_INET6) continue; if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { if ((((struct in6_ifaddr *)ifa)->ia6_flags & ignoreflags) != 0) continue; break; } } return((struct in6_ifaddr *)ifa); } /* * find the internet address corresponding to a given interface and address. */ struct in6_ifaddr * in6ifa_ifpwithaddr(ifp, addr) struct ifnet *ifp; struct in6_addr *addr; { struct ifaddr *ifa; for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { if (ifa->ifa_addr == NULL) continue; /* just for safety */ if (ifa->ifa_addr->sa_family != AF_INET6) continue; if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) break; } return((struct in6_ifaddr *)ifa); } /* * Convert IP6 address to printable (loggable) representation. */ static char digits[] = "0123456789abcdef"; static int ip6round = 0; char * ip6_sprintf(addr) struct in6_addr *addr; { static char ip6buf[8][48]; int i; char *cp; u_short *a = (u_short *)addr; u_char *d; int dcolon = 0; ip6round = (ip6round + 1) & 7; cp = ip6buf[ip6round]; for (i = 0; i < 8; i++) { if (dcolon == 1) { if (*a == 0) { if (i == 7) *cp++ = ':'; a++; continue; } else dcolon = 2; } if (*a == 0) { if (dcolon == 0 && *(a + 1) == 0) { if (i == 0) *cp++ = ':'; *cp++ = ':'; dcolon = 1; } else { *cp++ = '0'; *cp++ = ':'; } a++; continue; } d = (u_char *)a; *cp++ = digits[*d >> 4]; *cp++ = digits[*d++ & 0xf]; *cp++ = digits[*d >> 4]; *cp++ = digits[*d & 0xf]; *cp++ = ':'; a++; } *--cp = 0; return(ip6buf[ip6round]); } int in6_localaddr(in6) struct in6_addr *in6; { struct in6_ifaddr *ia; if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) return 1; for (ia = in6_ifaddr; ia; ia = ia->ia_next) if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, &ia->ia_prefixmask.sin6_addr)) return 1; return (0); } /* * Get a scope of the address. Node-local, link-local, site-local or global. */ int in6_addrscope (addr) struct in6_addr *addr; { int scope; if (addr->s6_addr8[0] == 0xfe) { scope = addr->s6_addr8[1] & 0xc0; switch (scope) { case 0x80: return IPV6_ADDR_SCOPE_LINKLOCAL; break; case 0xc0: return IPV6_ADDR_SCOPE_SITELOCAL; break; default: return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */ break; } } if (addr->s6_addr8[0] == 0xff) { scope = addr->s6_addr8[1] & 0x0f; /* * due to other scope such as reserved, * return scope doesn't work. */ switch (scope) { case IPV6_ADDR_SCOPE_NODELOCAL: return IPV6_ADDR_SCOPE_NODELOCAL; break; case IPV6_ADDR_SCOPE_LINKLOCAL: return IPV6_ADDR_SCOPE_LINKLOCAL; break; case IPV6_ADDR_SCOPE_SITELOCAL: return IPV6_ADDR_SCOPE_SITELOCAL; break; default: return IPV6_ADDR_SCOPE_GLOBAL; break; } } if (bcmp(&in6addr_loopback, addr, sizeof(addr) - 1) == 0) { if (addr->s6_addr8[15] == 1) /* loopback */ return IPV6_ADDR_SCOPE_NODELOCAL; if (addr->s6_addr8[15] == 0) /* unspecified */ return IPV6_ADDR_SCOPE_LINKLOCAL; } return IPV6_ADDR_SCOPE_GLOBAL; } int in6_addr2scopeid(ifp, addr) struct ifnet *ifp; /* must not be NULL */ struct in6_addr *addr; /* must not be NULL */ { int scope = in6_addrscope(addr); switch(scope) { case IPV6_ADDR_SCOPE_NODELOCAL: return(-1); /* XXX: is this an appropriate value? */ case IPV6_ADDR_SCOPE_LINKLOCAL: /* XXX: we do not distinguish between a link and an I/F. */ return(ifp->if_index); case IPV6_ADDR_SCOPE_SITELOCAL: return(0); /* XXX: invalid. */ default: return(0); /* XXX: treat as global. */ } } /* * return length of part which dst and src are equal * hard coding... */ int in6_matchlen(src, dst) struct in6_addr *src, *dst; { int match = 0; u_char *s = (u_char *)src, *d = (u_char *)dst; u_char *lim = s + 16, r; while (s < lim) if ((r = (*d++ ^ *s++)) != 0) { while (r < 128) { match++; r <<= 1; } break; } else match += 8; return match; } int in6_are_prefix_equal(p1, p2, len) struct in6_addr *p1, *p2; int len; { int bytelen, bitlen; /* sanity check */ if (0 > len || len > 128) { log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", len); return(0); } bytelen = len / 8; bitlen = len % 8; if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) return(0); if (p1->s6_addr[bytelen] >> (8 - bitlen) != p2->s6_addr[bytelen] >> (8 - bitlen)) return(0); return(1); } void in6_prefixlen2mask(maskp, len) struct in6_addr *maskp; int len; { u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; int bytelen, bitlen, i; /* sanity check */ if (0 > len || len > 128) { log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", len); return; } bzero(maskp, sizeof(*maskp)); bytelen = len / 8; bitlen = len % 8; for (i = 0; i < bytelen; i++) maskp->s6_addr[i] = 0xff; if (bitlen) maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; } /* * return the best address out of the same scope */ struct in6_ifaddr * in6_ifawithscope(oifp, dst) struct ifnet *oifp; struct in6_addr *dst; { int dst_scope = in6_addrscope(dst), src_scope, best_scope = 0; int blen = -1; struct ifaddr *ifa; struct ifnet *ifp; struct in6_ifaddr *ifa_best = NULL; if (oifp == NULL) { printf("in6_ifawithscope: output interface is not specified\n"); return(NULL); } /* * We search for all addresses on all interfaces from the beginning. * Comparing an interface with the outgoing interface will be done * only at the final stage of tiebreaking. */ for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { /* * We can never take an address that breaks the scope zone * of the destination. */ if (in6_addr2scopeid(ifp, dst) != in6_addr2scopeid(oifp, dst)) continue; for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { int tlen = -1, dscopecmp, bscopecmp, matchcmp; if (ifa->ifa_addr->sa_family != AF_INET6) continue; src_scope = in6_addrscope(IFA_IN6(ifa)); #ifdef ADDRSELECT_DEBUG /* should be removed after stabilization */ dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope); printf("in6_ifawithscope: dst=%s bestaddr=%s, " "newaddr=%s, scope=%x, dcmp=%d, bcmp=%d, " "matchlen=%d, flgs=%x\n", ip6_sprintf(dst), ifa_best ? ip6_sprintf(&ifa_best->ia_addr.sin6_addr) : "none", ip6_sprintf(IFA_IN6(ifa)), src_scope, dscopecmp, ifa_best ? IN6_ARE_SCOPE_CMP(src_scope, best_scope) : -1, in6_matchlen(IFA_IN6(ifa), dst), ((struct in6_ifaddr *)ifa)->ia6_flags); #endif /* * Don't use an address before completing DAD * nor a duplicated address. */ if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) continue; /* XXX: is there any case to allow anycasts? */ if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) continue; if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) continue; /* * If this is the first address we find, * keep it anyway. */ if (ifa_best == NULL) goto replace; /* * ifa_best is never NULL beyond this line except * within the block labeled "replace". */ /* * If ifa_best has a smaller scope than dst and * the current address has a larger one than * (or equal to) dst, always replace ifa_best. * Also, if the current address has a smaller scope * than dst, ignore it unless ifa_best also has a * smaller scope. */ if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0 && IN6_ARE_SCOPE_CMP(src_scope, dst_scope) >= 0) goto replace; if (IN6_ARE_SCOPE_CMP(src_scope, dst_scope) < 0 && IN6_ARE_SCOPE_CMP(best_scope, dst_scope) >= 0) continue; /* * A deprecated address SHOULD NOT be used in new * communications if an alternate (non-deprecated) * address is available and has sufficient scope. * RFC 2462, Section 5.5.4. */ if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { /* * Ignore any deprecated addresses if * specified by configuration. */ if (!ip6_use_deprecated) continue; /* * If we have already found a non-deprecated * candidate, just ignore deprecated addresses. */ if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) == 0) continue; } /* * A non-deprecated address is always preferred * to a deprecated one regardless of scopes and * address matching. */ if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) == 0) goto replace; /* * At this point, we have two cases: * 1. we are looking at a non-deprecated address, * and ifa_best is also non-deprecated. * 2. we are looking at a deprecated address, * and ifa_best is also deprecated. * Also, we do not have to consider a case where * the scope of if_best is larger(smaller) than dst and * the scope of the current address is smaller(larger) * than dst. Such a case has already been covered. * Tiebreaking is done according to the following * items: * - the scope comparison between the address and * dst (dscopecmp) * - the scope comparison between the address and * ifa_best (bscopecmp) * - if the address match dst longer than ifa_best * (matchcmp) * - if the address is on the outgoing I/F (outI/F) * * Roughly speaking, the selection policy is * - the most important item is scope. The same scope * is best. Then search for a larger scope. * Smaller scopes are the last resort. * - A deprecated address is chosen only when we have * no address that has an enough scope, but is * prefered to any addresses of smaller scopes. * - Longest address match against dst is considered * only for addresses that has the same scope of dst. * - If there is no other reasons to choose one, * addresses on the outgoing I/F are preferred. * * The precise decision table is as follows: * dscopecmp bscopecmp matchcmp outI/F | replace? * !equal equal N/A Yes | Yes (1) * !equal equal N/A No | No (2) * larger larger N/A N/A | No (3) * larger smaller N/A N/A | Yes (4) * smaller larger N/A N/A | Yes (5) * smaller smaller N/A N/A | No (6) * equal smaller N/A N/A | Yes (7) * equal larger (already done) * equal equal larger N/A | Yes (8) * equal equal smaller N/A | No (9) * equal equal equal Yes | Yes (a) * eaual eqaul equal No | No (b) */ dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope); bscopecmp = IN6_ARE_SCOPE_CMP(src_scope, best_scope); if (dscopecmp && bscopecmp == 0) { if (oifp == ifp) /* (1) */ goto replace; continue; /* (2) */ } if (dscopecmp > 0) { if (bscopecmp > 0) /* (3) */ continue; goto replace; /* (4) */ } if (dscopecmp < 0) { if (bscopecmp > 0) /* (5) */ goto replace; continue; /* (6) */ } /* now dscopecmp must be 0 */ if (bscopecmp < 0) goto replace; /* (7) */ /* * At last both dscopecmp and bscopecmp must be 0. * We need address matching against dst for * tiebreaking. */ tlen = in6_matchlen(IFA_IN6(ifa), dst); matchcmp = tlen - blen; if (matchcmp > 0) /* (8) */ goto replace; if (matchcmp < 0) /* (9) */ continue; if (oifp == ifp) /* (a) */ goto replace; continue; /* (b) */ replace: ifa_best = (struct in6_ifaddr *)ifa; blen = tlen >= 0 ? tlen : in6_matchlen(IFA_IN6(ifa), dst); best_scope = in6_addrscope(&ifa_best->ia_addr.sin6_addr); } } /* count statistics for future improvements */ if (ifa_best == NULL) ip6stat.ip6s_sources_none++; else { if (oifp == ifa_best->ia_ifp) ip6stat.ip6s_sources_sameif[best_scope]++; else ip6stat.ip6s_sources_otherif[best_scope]++; if (best_scope == dst_scope) ip6stat.ip6s_sources_samescope[best_scope]++; else ip6stat.ip6s_sources_otherscope[best_scope]++; if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) != 0) ip6stat.ip6s_sources_deprecated[best_scope]++; } return(ifa_best); } /* * return the best address out of the same scope. if no address was * found, return the first valid address from designated IF. */ struct in6_ifaddr * in6_ifawithifp(ifp, dst) struct ifnet *ifp; struct in6_addr *dst; { int dst_scope = in6_addrscope(dst), blen = -1, tlen; struct ifaddr *ifa; struct in6_ifaddr *besta = 0; struct in6_ifaddr *dep[2]; /*last-resort: deprecated*/ dep[0] = dep[1] = NULL; /* * We first look for addresses in the same scope. * If there is one, return it. * If two or more, return one which matches the dst longest. * If none, return one of global addresses assigned other ifs. */ for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) continue; /* XXX: is there any case to allow anycast? */ if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) continue; /* don't use this interface */ if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) continue; if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { if (ip6_use_deprecated) dep[0] = (struct in6_ifaddr *)ifa; continue; } if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { /* * call in6_matchlen() as few as possible */ if (besta) { if (blen == -1) blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); tlen = in6_matchlen(IFA_IN6(ifa), dst); if (tlen > blen) { blen = tlen; besta = (struct in6_ifaddr *)ifa; } } else besta = (struct in6_ifaddr *)ifa; } } if (besta) return(besta); for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) continue; /* XXX: is there any case to allow anycast? */ if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) continue; /* don't use this interface */ if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) continue; if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { if (ip6_use_deprecated) dep[1] = (struct in6_ifaddr *)ifa; continue; } return (struct in6_ifaddr *)ifa; } /* use the last-resort values, that are, deprecated addresses */ if (dep[0]) return dep[0]; if (dep[1]) return dep[1]; return NULL; } /* * perform DAD when interface becomes IFF_UP. */ void in6_if_up(ifp) struct ifnet *ifp; { struct ifaddr *ifa; struct in6_ifaddr *ia; int dad_delay; /* delay ticks before DAD output */ /* * special cases, like 6to4, are handled in in6_ifattach */ in6_ifattach(ifp, NULL); dad_delay = 0; for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; ia = (struct in6_ifaddr *)ifa; if (ia->ia6_flags & IN6_IFF_TENTATIVE) nd6_dad_start(ifa, &dad_delay); } } /* * Calculate max IPv6 MTU through all the interfaces and store it * to in6_maxmtu. */ void in6_setmaxmtu() { unsigned long maxmtu = 0; struct ifnet *ifp; for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { if ((ifp->if_flags & IFF_LOOPBACK) == 0 && nd_ifinfo[ifp->if_index].linkmtu > maxmtu) maxmtu = nd_ifinfo[ifp->if_index].linkmtu; } if (maxmtu) /* update only when maxmtu is positive */ in6_maxmtu = maxmtu; }