/* $OpenBSD: in6.c,v 1.248 2022/08/29 07:51:45 bluhm Exp $ */ /* $KAME: in6.c,v 1.372 2004/06/14 08:14:21 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. 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 "carp.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef MROUTING #include #endif #include #if NCARP > 0 #include #endif /* * Definitions of some constant 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_intfacelocal_allnodes = IN6ADDR_INTFACELOCAL_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; int in6_ioctl(u_long, caddr_t, struct ifnet *, int); int in6_ioctl_change_ifaddr(u_long, caddr_t, struct ifnet *); int in6_ioctl_get(u_long, caddr_t, struct ifnet *); int in6_check_embed_scope(struct sockaddr_in6 *, unsigned int); int in6_clear_scope_id(struct sockaddr_in6 *, unsigned int); int in6_ifinit(struct ifnet *, struct in6_ifaddr *, int); void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); const struct sockaddr_in6 sa6_any = { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 }; int in6_mask2len(struct in6_addr *mask, u_char *lim0) { int x = 0, y; u_char *lim = lim0, *p; /* ignore the scope_id part */ if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) lim = (u_char *)mask + sizeof(*mask); for (p = (u_char *)mask; p < lim; x++, p++) { if (*p != 0xff) break; } y = 0; if (p < lim) { for (y = 0; y < 8; y++) { if ((*p & (0x80 >> y)) == 0) break; } } /* * when the limit pointer is given, do a stricter check on the * remaining bits. */ if (p < lim) { if (y != 0 && (*p & (0x00ff >> y)) != 0) return (-1); for (p = p + 1; p < lim; p++) if (*p != 0) return (-1); } return x * 8 + y; } int in6_nam2sin6(const struct mbuf *nam, struct sockaddr_in6 **sin6) { struct sockaddr *sa = mtod(nam, struct sockaddr *); if (nam->m_len < offsetof(struct sockaddr, sa_data)) return EINVAL; if (sa->sa_family != AF_INET6) return EAFNOSUPPORT; if (sa->sa_len != nam->m_len) return EINVAL; if (sa->sa_len != sizeof(struct sockaddr_in6)) return EINVAL; *sin6 = satosin6(sa); return 0; } int in6_sa2sin6(struct sockaddr *sa, struct sockaddr_in6 **sin6) { if (sa->sa_family != AF_INET6) return EAFNOSUPPORT; if (sa->sa_len != sizeof(struct sockaddr_in6)) return EINVAL; *sin6 = satosin6(sa); return 0; } int in6_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp) { int privileged; int error; privileged = 0; if ((so->so_state & SS_PRIV) != 0) privileged++; switch (cmd) { #ifdef MROUTING case SIOCGETSGCNT_IN6: case SIOCGETMIFCNT_IN6: error = mrt6_ioctl(so, cmd, data); break; #endif /* MROUTING */ default: error = in6_ioctl(cmd, data, ifp, privileged); break; } return error; } int in6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, int privileged) { if (ifp == NULL) return (ENXIO); switch (cmd) { case SIOCGIFINFO_IN6: case SIOCGNBRINFO_IN6: return (nd6_ioctl(cmd, data, ifp)); case SIOCGIFDSTADDR_IN6: case SIOCGIFNETMASK_IN6: case SIOCGIFAFLAG_IN6: case SIOCGIFALIFETIME_IN6: return (in6_ioctl_get(cmd, data, ifp)); case SIOCAIFADDR_IN6: case SIOCDIFADDR_IN6: if (!privileged) return (EPERM); return (in6_ioctl_change_ifaddr(cmd, data, ifp)); case SIOCSIFADDR: case SIOCSIFDSTADDR: case SIOCSIFBRDADDR: case SIOCSIFNETMASK: /* * Do not pass those ioctl to driver handler since they are not * properly set up. Instead just error out. */ return (EINVAL); default: return (EOPNOTSUPP); } } int in6_ioctl_change_ifaddr(u_long cmd, caddr_t data, struct ifnet *ifp) { struct in6_ifaddr *ia6 = NULL; struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; struct sockaddr *sa; struct sockaddr_in6 *sa6 = NULL; int error = 0, newifaddr = 0, plen; /* * Find address for this interface, if it exists. * * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation * only, and used the first interface address as the target of other * operations (without checking ifra_addr). This was because netinet * code/API assumed at most 1 interface address per interface. * Since IPv6 allows a node to assign multiple addresses * on a single interface, we almost always look and check the * presence of ifra_addr, and reject invalid ones here. * It also decreases duplicated code among SIOC*_IN6 operations. * * We always require users to specify a valid IPv6 address for * the corresponding operation. */ switch (cmd) { case SIOCAIFADDR_IN6: sa = sin6tosa(&ifra->ifra_addr); break; case SIOCDIFADDR_IN6: sa = sin6tosa(&((struct in6_ifreq *)data)->ifr_addr); break; default: panic("%s: invalid ioctl %lu", __func__, cmd); } if (sa->sa_family == AF_INET6) { error = in6_sa2sin6(sa, &sa6); if (error) return (error); } NET_LOCK(); if (sa6 != NULL) { error = in6_check_embed_scope(sa6, ifp->if_index); if (error) goto err; error = in6_clear_scope_id(sa6, ifp->if_index); if (error) goto err; ia6 = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); } switch (cmd) { case SIOCDIFADDR_IN6: /* * for IPv4, we look for existing in_ifaddr here to allow * "ifconfig if0 delete" to remove the first IPv4 address on * the interface. For IPv6, as the spec allows multiple * interface address from the day one, we consider "remove the * first one" semantics to be not preferable. */ if (ia6 == NULL) { error = EADDRNOTAVAIL; break; } in6_purgeaddr(&ia6->ia_ifa); if_addrhooks_run(ifp); break; case SIOCAIFADDR_IN6: if (ifra->ifra_addr.sin6_family != AF_INET6 || ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { error = EAFNOSUPPORT; break; } /* reject read-only flags */ if ((ifra->ifra_flags & IN6_IFF_DUPLICATED) != 0 || (ifra->ifra_flags & IN6_IFF_DETACHED) != 0 || (ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { error = EINVAL; break; } if (ia6 == NULL) newifaddr = 1; /* * Make the address tentative before joining multicast * addresses, so that corresponding MLD responses would * not have a tentative source address. */ if (newifaddr && in6if_do_dad(ifp)) ifra->ifra_flags |= IN6_IFF_TENTATIVE; /* * first, make or update the interface address structure, * and link it to the list. try to enable inet6 if there * is no link-local yet. */ error = in6_ifattach(ifp); if (error) break; error = in6_update_ifa(ifp, ifra, ia6); if (error) break; ia6 = NULL; if (sa6 != NULL) ia6 = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); if (ia6 == NULL) { /* * this can happen when the user specify the 0 valid * lifetime. */ break; } /* Perform DAD, if needed. */ if (ia6->ia6_flags & IN6_IFF_TENTATIVE) nd6_dad_start(&ia6->ia_ifa); if (!newifaddr) { if_addrhooks_run(ifp); break; } plen = in6_mask2len(&ia6->ia_prefixmask.sin6_addr, NULL); if ((ifp->if_flags & IFF_LOOPBACK) || plen == 128) { if_addrhooks_run(ifp); break; /* No need to install a connected route. */ } error = rt_ifa_add(&ia6->ia_ifa, RTF_CLONING | RTF_CONNECTED | RTF_MPATH, ia6->ia_ifa.ifa_addr, ifp->if_rdomain); if (error) { in6_purgeaddr(&ia6->ia_ifa); break; } if_addrhooks_run(ifp); break; } err: NET_UNLOCK(); return (error); } int in6_ioctl_get(u_long cmd, caddr_t data, struct ifnet *ifp) { struct in6_ifreq *ifr = (struct in6_ifreq *)data; struct in6_ifaddr *ia6 = NULL; struct sockaddr *sa; struct sockaddr_in6 *sa6 = NULL; int error = 0; sa = sin6tosa(&ifr->ifr_addr); if (sa->sa_family == AF_INET6) { sa->sa_len = sizeof(struct sockaddr_in6); error = in6_sa2sin6(sa, &sa6); if (error) return (error); } NET_LOCK_SHARED(); if (sa6 != NULL) { error = in6_check_embed_scope(sa6, ifp->if_index); if (error) goto err; error = in6_clear_scope_id(sa6, ifp->if_index); if (error) goto err; ia6 = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); } /* must think again about its semantics */ if (ia6 == NULL) { error = EADDRNOTAVAIL; goto err; } switch (cmd) { case SIOCGIFDSTADDR_IN6: if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { error = EINVAL; break; } /* * XXX: should we check if ifa_dstaddr is NULL and return * an error? */ ifr->ifr_dstaddr = ia6->ia_dstaddr; break; case SIOCGIFNETMASK_IN6: ifr->ifr_addr = ia6->ia_prefixmask; break; case SIOCGIFAFLAG_IN6: ifr->ifr_ifru.ifru_flags6 = ia6->ia6_flags; break; case SIOCGIFALIFETIME_IN6: ifr->ifr_ifru.ifru_lifetime = ia6->ia6_lifetime; if (ia6->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { time_t expire, maxexpire; struct in6_addrlifetime *retlt = &ifr->ifr_ifru.ifru_lifetime; /* * XXX: adjust expiration time assuming time_t is * signed. */ maxexpire = (time_t)~(1ULL << ((sizeof(maxexpire) * 8) - 1)); if (ia6->ia6_lifetime.ia6t_vltime < maxexpire - ia6->ia6_updatetime) { expire = ia6->ia6_updatetime + ia6->ia6_lifetime.ia6t_vltime; if (expire != 0) { expire -= getuptime(); expire += gettime(); } retlt->ia6t_expire = expire; } else retlt->ia6t_expire = maxexpire; } if (ia6->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { time_t expire, maxexpire; struct in6_addrlifetime *retlt = &ifr->ifr_ifru.ifru_lifetime; /* * XXX: adjust expiration time assuming time_t is * signed. */ maxexpire = (time_t)~(1ULL << ((sizeof(maxexpire) * 8) - 1)); if (ia6->ia6_lifetime.ia6t_pltime < maxexpire - ia6->ia6_updatetime) { expire = ia6->ia6_updatetime + ia6->ia6_lifetime.ia6t_pltime; if (expire != 0) { expire -= getuptime(); expire += gettime(); } retlt->ia6t_preferred = expire; } else retlt->ia6t_preferred = maxexpire; } break; default: panic("%s: invalid ioctl %lu", __func__, cmd); } err: NET_UNLOCK_SHARED(); return (error); } int in6_check_embed_scope(struct sockaddr_in6 *sa6, unsigned int ifidx) { if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) { if (sa6->sin6_addr.s6_addr16[1] == 0) { /* link ID is not embedded by the user */ sa6->sin6_addr.s6_addr16[1] = htons(ifidx); } else if (sa6->sin6_addr.s6_addr16[1] != htons(ifidx)) return EINVAL; /* link ID contradicts */ } return 0; } int in6_clear_scope_id(struct sockaddr_in6 *sa6, unsigned int ifidx) { if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) { if (sa6->sin6_scope_id) { if (sa6->sin6_scope_id != (u_int32_t)ifidx) return EINVAL; sa6->sin6_scope_id = 0; /* XXX: good way? */ } } return 0; } /* * Update parameters of an IPv6 interface address. * If necessary, a new entry is created and linked into address chains. * This function is separated from in6_control(). */ int in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, struct in6_ifaddr *ia6) { int error = 0, hostIsNew = 0, plen = -1; struct sockaddr_in6 dst6; struct in6_addrlifetime *lt; struct in6_multi_mship *imm; struct rtentry *rt; char addr[INET6_ADDRSTRLEN]; NET_ASSERT_LOCKED(); /* Validate parameters */ if (ifp == NULL || ifra == NULL) /* this maybe redundant */ return (EINVAL); /* * 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); /* * validate ifra_prefixmask. don't check sin6_family, netmask * does not carry fields other than sin6_len. */ if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) return (EINVAL); /* * Because the IPv6 address architecture is classless, we require * users to specify a (non 0) prefix length (mask) for a new address. * We also require the prefix (when specified) mask is valid, and thus * reject a non-consecutive mask. */ if (ia6 == NULL && ifra->ifra_prefixmask.sin6_len == 0) return (EINVAL); if (ifra->ifra_prefixmask.sin6_len != 0) { plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, (u_char *)&ifra->ifra_prefixmask + ifra->ifra_prefixmask.sin6_len); if (plen <= 0) return (EINVAL); } else { /* * In this case, ia6 must not be NULL. We just use its prefix * length. */ plen = in6_mask2len(&ia6->ia_prefixmask.sin6_addr, NULL); } /* * If the destination address on a p2p interface is specified, * and the address is a scoped one, validate/set the scope * zone identifier. */ dst6 = ifra->ifra_dstaddr; if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && (dst6.sin6_family == AF_INET6)) { error = in6_check_embed_scope(&dst6, ifp->if_index); if (error) return error; } /* * The destination address can be specified only for a p2p or a * loopback interface. If specified, the corresponding prefix length * must be 128. */ if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) return (EINVAL); if (plen != 128) return (EINVAL); } /* lifetime consistency check */ lt = &ifra->ifra_lifetime; if (lt->ia6t_pltime > lt->ia6t_vltime) return (EINVAL); if (lt->ia6t_vltime == 0) { /* * the following log might be noisy, but this is a typical * configuration mistake or a tool's bug. */ nd6log((LOG_INFO, "%s: valid lifetime is 0 for %s\n", __func__, inet_ntop(AF_INET6, &ifra->ifra_addr.sin6_addr, addr, sizeof(addr)))); if (ia6 == NULL) return (0); /* there's nothing to do */ } /* * If this is a new address, allocate a new ifaddr and link it * into chains. */ if (ia6 == NULL) { hostIsNew = 1; ia6 = malloc(sizeof(*ia6), M_IFADDR, M_WAITOK | M_ZERO); refcnt_init_trace(&ia6->ia_ifa.ifa_refcnt, DT_REFCNT_IDX_IFADDR); LIST_INIT(&ia6->ia6_memberships); /* Initialize the address and masks, and put time stamp */ ia6->ia_ifa.ifa_addr = sin6tosa(&ia6->ia_addr); ia6->ia_addr.sin6_family = AF_INET6; ia6->ia_addr.sin6_len = sizeof(ia6->ia_addr); ia6->ia6_updatetime = getuptime(); if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { /* * XXX: some functions expect that ifa_dstaddr is not * NULL for p2p interfaces. */ ia6->ia_ifa.ifa_dstaddr = sin6tosa(&ia6->ia_dstaddr); } else { ia6->ia_ifa.ifa_dstaddr = NULL; } ia6->ia_ifa.ifa_netmask = sin6tosa(&ia6->ia_prefixmask); ia6->ia_ifp = ifp; ia6->ia_addr = ifra->ifra_addr; ifa_add(ifp, &ia6->ia_ifa); } /* set prefix mask */ if (ifra->ifra_prefixmask.sin6_len) { /* * We prohibit changing the prefix length of an existing * address, because * + such an operation should be rare in IPv6, and * + the operation would confuse prefix management. */ if (ia6->ia_prefixmask.sin6_len && in6_mask2len(&ia6->ia_prefixmask.sin6_addr, NULL) != plen) { error = EINVAL; goto unlink; } ia6->ia_prefixmask = ifra->ifra_prefixmask; } /* * If a new destination address is specified, scrub the old one and * install the new destination. Note that the interface must be * p2p or loopback (see the check above.) */ if ((ifp->if_flags & IFF_POINTOPOINT) && dst6.sin6_family == AF_INET6 && !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia6->ia_dstaddr.sin6_addr)) { struct ifaddr *ifa = &ia6->ia_ifa; if ((ia6->ia_flags & IFA_ROUTE) != 0 && rt_ifa_del(ifa, RTF_HOST, ifa->ifa_dstaddr, ifp->if_rdomain) != 0) { nd6log((LOG_ERR, "%s: failed to remove a route " "to the old destination: %s\n", __func__, inet_ntop(AF_INET6, &ia6->ia_addr.sin6_addr, addr, sizeof(addr)))); /* proceed anyway... */ } else ia6->ia_flags &= ~IFA_ROUTE; ia6->ia_dstaddr = dst6; } /* * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred * to see if the address is deprecated or invalidated, but initialize * these members for applications. */ ia6->ia6_updatetime = getuptime(); ia6->ia6_lifetime = ifra->ifra_lifetime; if (ia6->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { ia6->ia6_lifetime.ia6t_expire = getuptime() + ia6->ia6_lifetime.ia6t_vltime; } else ia6->ia6_lifetime.ia6t_expire = 0; if (ia6->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { ia6->ia6_lifetime.ia6t_preferred = getuptime() + ia6->ia6_lifetime.ia6t_pltime; } else ia6->ia6_lifetime.ia6t_preferred = 0; /* reset the interface and routing table appropriately. */ if ((error = in6_ifinit(ifp, ia6, hostIsNew)) != 0) goto unlink; /* re-run DAD */ if (ia6->ia6_flags & (IN6_IFF_TENTATIVE|IN6_IFF_DUPLICATED)) ifra->ifra_flags |= IN6_IFF_TENTATIVE; /* * configure address flags. */ ia6->ia6_flags = ifra->ifra_flags; nd6_expire_timer_update(ia6); /* * We are done if we have simply modified an existing address. */ if (!hostIsNew) return (error); /* * Beyond this point, we should call in6_purgeaddr upon an error, * not just go to unlink. */ /* join necessary multiast groups */ if ((ifp->if_flags & IFF_MULTICAST) != 0) { struct sockaddr_in6 mltaddr, mltmask; /* join solicited multicast addr for new host id */ struct sockaddr_in6 llsol; bzero(&llsol, sizeof(llsol)); llsol.sin6_family = AF_INET6; llsol.sin6_len = sizeof(llsol); llsol.sin6_addr.s6_addr16[0] = htons(0xff02); llsol.sin6_addr.s6_addr16[1] = htons(ifp->if_index); llsol.sin6_addr.s6_addr32[1] = 0; llsol.sin6_addr.s6_addr32[2] = htonl(1); llsol.sin6_addr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; llsol.sin6_addr.s6_addr8[12] = 0xff; imm = in6_joingroup(ifp, &llsol.sin6_addr, &error); if (!imm) goto cleanup; LIST_INSERT_HEAD(&ia6->ia6_memberships, imm, i6mm_chain); 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); mltaddr.sin6_scope_id = 0; /* * XXX: do we really need this automatic routes? * We should probably reconsider this stuff. Most applications * actually do not need the routes, since they usually specify * the outgoing interface. */ rt = rtalloc(sin6tosa(&mltaddr), 0, ifp->if_rdomain); if (rt) { /* 32bit came from "mltmask" */ if (memcmp(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr, 32 / 8)) { rtfree(rt); rt = NULL; } } if (!rt) { struct rt_addrinfo info; bzero(&info, sizeof(info)); info.rti_ifa = &ia6->ia_ifa; info.rti_info[RTAX_DST] = sin6tosa(&mltaddr); info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia6->ia_addr); info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask); info.rti_info[RTAX_IFA] = sin6tosa(&ia6->ia_addr); info.rti_flags = RTF_MULTICAST; error = rtrequest(RTM_ADD, &info, RTP_CONNECTED, NULL, ifp->if_rdomain); if (error) goto cleanup; } else { rtfree(rt); } imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error); if (!imm) goto cleanup; LIST_INSERT_HEAD(&ia6->ia6_memberships, imm, i6mm_chain); /* * join interface-local all-nodes address. * (ff01::1%ifN, and ff01::%ifN/32) */ bzero(&mltaddr, sizeof(mltaddr)); mltaddr.sin6_len = sizeof(struct sockaddr_in6); mltaddr.sin6_family = AF_INET6; mltaddr.sin6_addr = in6addr_intfacelocal_allnodes; mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); mltaddr.sin6_scope_id = 0; /* XXX: again, do we really need the route? */ rt = rtalloc(sin6tosa(&mltaddr), 0, ifp->if_rdomain); if (rt) { /* 32bit came from "mltmask" */ if (memcmp(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr, 32 / 8)) { rtfree(rt); rt = NULL; } } if (!rt) { struct rt_addrinfo info; bzero(&info, sizeof(info)); info.rti_ifa = &ia6->ia_ifa; info.rti_info[RTAX_DST] = sin6tosa(&mltaddr); info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia6->ia_addr); info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask); info.rti_info[RTAX_IFA] = sin6tosa(&ia6->ia_addr); info.rti_flags = RTF_MULTICAST; error = rtrequest(RTM_ADD, &info, RTP_CONNECTED, NULL, ifp->if_rdomain); if (error) goto cleanup; } else { rtfree(rt); } imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error); if (!imm) goto cleanup; LIST_INSERT_HEAD(&ia6->ia6_memberships, imm, i6mm_chain); } return (error); unlink: /* * XXX: if a change of an existing address failed, keep the entry * anyway. */ if (hostIsNew) in6_unlink_ifa(ia6, ifp); return (error); cleanup: in6_purgeaddr(&ia6->ia_ifa); return error; } void in6_purgeaddr(struct ifaddr *ifa) { struct ifnet *ifp = ifa->ifa_ifp; struct in6_ifaddr *ia6 = ifatoia6(ifa); struct in6_multi_mship *imm; /* stop DAD processing */ nd6_dad_stop(ifa); /* * delete route to the destination of the address being purged. * The interface must be p2p or loopback in this case. */ if ((ifp->if_flags & IFF_POINTOPOINT) && (ia6->ia_flags & IFA_ROUTE) && ia6->ia_dstaddr.sin6_len != 0) { int e; e = rt_ifa_del(ifa, RTF_HOST, ifa->ifa_dstaddr, ifp->if_rdomain); if (e != 0) { char addr[INET6_ADDRSTRLEN]; log(LOG_ERR, "in6_purgeaddr: failed to remove " "a route to the p2p destination: %s on %s, " "errno=%d\n", inet_ntop(AF_INET6, &ia6->ia_addr.sin6_addr, addr, sizeof(addr)), ifp->if_xname, e); /* proceed anyway... */ } else ia6->ia_flags &= ~IFA_ROUTE; } /* Remove ownaddr's loopback rtentry, if it exists. */ rt_ifa_dellocal(&(ia6->ia_ifa)); /* * leave from multicast groups we have joined for the interface */ while (!LIST_EMPTY(&ia6->ia6_memberships)) { imm = LIST_FIRST(&ia6->ia6_memberships); LIST_REMOVE(imm, i6mm_chain); in6_leavegroup(imm); } in6_unlink_ifa(ia6, ifp); } void in6_unlink_ifa(struct in6_ifaddr *ia6, struct ifnet *ifp) { struct ifaddr *ifa = &ia6->ia_ifa; int plen; NET_ASSERT_LOCKED(); /* Release the reference to the base prefix. */ plen = in6_mask2len(&ia6->ia_prefixmask.sin6_addr, NULL); if ((ifp->if_flags & IFF_LOOPBACK) == 0 && plen != 128) { rt_ifa_del(ifa, RTF_CLONING | RTF_CONNECTED, ifa->ifa_addr, ifp->if_rdomain); } rt_ifa_purge(ifa); ifa_del(ifp, ifa); ia6->ia_ifp = NULL; ifafree(&ia6->ia_ifa); } /* * Initialize an interface's inet6 address * and routing table entry. */ int in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia6, int newhost) { int error = 0, plen, ifacount = 0; struct ifaddr *ifa; NET_ASSERT_LOCKED(); /* * Give the interface a chance to initialize * if this is its first address (or it is a CARP interface) * and to validate the address if necessary. */ TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; ifacount++; } if ((ifacount <= 1 || ifp->if_type == IFT_CARP || (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))) && (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia6))) { return (error); } ia6->ia_ifa.ifa_metric = ifp->if_metric; /* we could do in(6)_socktrim here, but just omit it at this moment. */ /* * Special case: * If the destination address is specified for a point-to-point * interface, install a route to the destination as an interface * direct route. */ plen = in6_mask2len(&ia6->ia_prefixmask.sin6_addr, NULL); /* XXX */ if ((ifp->if_flags & IFF_POINTOPOINT) && plen == 128 && ia6->ia_dstaddr.sin6_family == AF_INET6) { ifa = &ia6->ia_ifa; error = rt_ifa_add(ifa, RTF_HOST | RTF_MPATH, ifa->ifa_dstaddr, ifp->if_rdomain); if (error != 0) return (error); ia6->ia_flags |= IFA_ROUTE; } if (newhost) error = rt_ifa_addlocal(&(ia6->ia_ifa)); return (error); } /* * Add an address to the list of IP6 multicast addresses for a * given interface. */ struct in6_multi * in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp, int *errorp) { struct in6_ifreq ifr; struct in6_multi *in6m; NET_ASSERT_LOCKED(); *errorp = 0; /* * See if address already in list. */ IN6_LOOKUP_MULTI(*maddr6, ifp, in6m); if (in6m != NULL) { /* * Found it; just increment the reference count. */ in6m->in6m_refcnt++; } else { /* * New address; allocate a new multicast record * and link it into the interface's multicast list. */ in6m = malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT | M_ZERO); if (in6m == NULL) { *errorp = ENOBUFS; return (NULL); } in6m->in6m_sin.sin6_len = sizeof(struct sockaddr_in6); in6m->in6m_sin.sin6_family = AF_INET6; in6m->in6m_sin.sin6_addr = *maddr6; in6m->in6m_refcnt = 1; in6m->in6m_ifidx = ifp->if_index; in6m->in6m_ifma.ifma_addr = sin6tosa(&in6m->in6m_sin); /* * Ask the network driver to update its multicast reception * filter appropriately for the new address. */ memcpy(&ifr.ifr_addr, &in6m->in6m_sin, sizeof(in6m->in6m_sin)); *errorp = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); if (*errorp) { free(in6m, M_IPMADDR, sizeof(*in6m)); return (NULL); } TAILQ_INSERT_HEAD(&ifp->if_maddrlist, &in6m->in6m_ifma, ifma_list); /* * Let MLD6 know that we have joined a new IP6 multicast * group. */ mld6_start_listening(in6m); } return (in6m); } /* * Delete a multicast address record. */ void in6_delmulti(struct in6_multi *in6m) { struct in6_ifreq ifr; struct ifnet *ifp; NET_ASSERT_LOCKED(); if (--in6m->in6m_refcnt == 0) { /* * No remaining claims to this record; let MLD6 know * that we are leaving the multicast group. */ mld6_stop_listening(in6m); ifp = if_get(in6m->in6m_ifidx); /* * Notify the network driver to update its multicast * reception filter. */ if (ifp != NULL) { 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; KERNEL_LOCK(); (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); KERNEL_UNLOCK(); TAILQ_REMOVE(&ifp->if_maddrlist, &in6m->in6m_ifma, ifma_list); } if_put(ifp); free(in6m, M_IPMADDR, sizeof(*in6m)); } } /* * Return 1 if the multicast group represented by ``maddr6'' has been * joined by interface ``ifp'', 0 otherwise. */ int in6_hasmulti(struct in6_addr *maddr6, struct ifnet *ifp) { struct in6_multi *in6m; int joined; IN6_LOOKUP_MULTI(*maddr6, ifp, in6m); joined = (in6m != NULL); return (joined); } struct in6_multi_mship * in6_joingroup(struct ifnet *ifp, struct in6_addr *addr, int *errorp) { struct in6_multi_mship *imm; imm = malloc(sizeof(*imm), M_IPMADDR, M_NOWAIT); if (!imm) { *errorp = ENOBUFS; return NULL; } imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp); if (!imm->i6mm_maddr) { /* *errorp is already set */ free(imm, M_IPMADDR, sizeof(*imm)); return NULL; } return imm; } void in6_leavegroup(struct in6_multi_mship *imm) { if (imm->i6mm_maddr) in6_delmulti(imm->i6mm_maddr); free(imm, M_IPMADDR, sizeof(*imm)); } /* * Find an IPv6 interface link-local address specific to an interface. */ struct in6_ifaddr * in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) { struct ifaddr *ifa; TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { if ((ifatoia6(ifa)->ia6_flags & ignoreflags) != 0) continue; break; } } return (ifatoia6(ifa)); } /* * find the internet address corresponding to a given interface and address. */ struct in6_ifaddr * in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) { struct ifaddr *ifa; TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) break; } return (ifatoia6(ifa)); } /* * Get a scope of the address. Node-local, link-local, site-local or global. */ int in6_addrscope(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_INTFACELOCAL: return __IPV6_ADDR_SCOPE_INTFACELOCAL; 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_INTFACELOCAL; if (addr->s6_addr8[15] == 0) /* unspecified */ return __IPV6_ADDR_SCOPE_LINKLOCAL; } return __IPV6_ADDR_SCOPE_GLOBAL; } int in6_addr2scopeid(unsigned int ifidx, struct in6_addr *addr) { int scope = in6_addrscope(addr); switch(scope) { case __IPV6_ADDR_SCOPE_INTFACELOCAL: case __IPV6_ADDR_SCOPE_LINKLOCAL: /* XXX: we do not distinguish between a link and an I/F. */ return (ifidx); 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(struct in6_addr *src, struct in6_addr *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; } void in6_prefixlen2mask(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; /* len == 128 is ok because bitlen == 0 then */ if (bitlen) maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; } /* * return the best address out of the same scope */ struct in6_ifaddr * in6_ifawithscope(struct ifnet *oifp, struct in6_addr *dst, u_int rdomain) { int dst_scope = in6_addrscope(dst), src_scope, best_scope = 0; int blen = -1; struct ifaddr *ifa; struct ifnet *ifp; struct in6_ifaddr *ia6_best = NULL; if (oifp == NULL) { printf("%s: output interface is not specified\n", __func__); return (NULL); } /* We search for all addresses on all interfaces from the beginning. */ TAILQ_FOREACH(ifp, &ifnet, if_list) { if (ifp->if_rdomain != rdomain) continue; #if NCARP > 0 /* * Never use a carp address of an interface which is not * the master. */ if (ifp->if_type == IFT_CARP && !carp_iamatch(ifp)) continue; #endif /* * We can never take an address that breaks the scope zone * of the destination. */ if (in6_addr2scopeid(ifp->if_index, dst) != in6_addr2scopeid(oifp->if_index, dst)) continue; TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { int tlen = -1; if (ifa->ifa_addr->sa_family != AF_INET6) continue; src_scope = in6_addrscope(IFA_IN6(ifa)); /* * Don't use an address before completing DAD * nor a duplicated address. */ if (ifatoia6(ifa)->ia6_flags & (IN6_IFF_TENTATIVE|IN6_IFF_DUPLICATED)) continue; /* * RFC 6724 allows anycast addresses as source address * because the restriction was removed in RFC 4291. * However RFC 4443 states that ICMPv6 responses * MUST use a unicast source address. * * XXX Skip anycast addresses for now since * icmp6_reflect() uses this function for source * address selection. */ if (ifatoia6(ifa)->ia6_flags & IN6_IFF_ANYCAST) continue; if (ifatoia6(ifa)->ia6_flags & IN6_IFF_DETACHED) continue; /* * If this is the first address we find, * keep it anyway. */ if (ia6_best == NULL) goto replace; /* * ia6_best is never NULL beyond this line except * within the block labeled "replace". */ /* * Rule 2: Prefer appropriate scope. * Find the address with the smallest scope that is * bigger (or equal) to the scope of the destination * address. * Accept an address with smaller scope than the * destination if non exists with bigger scope. */ if (best_scope < src_scope) { if (best_scope < dst_scope) goto replace; else continue; } else if (src_scope < best_scope) { if (src_scope < dst_scope) continue; else goto replace; } /* Rule 3: Avoid deprecated addresses. */ if (ifatoia6(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 ((ia6_best->ia6_flags & IN6_IFF_DEPRECATED) == 0) continue; } else if ((ia6_best->ia6_flags & IN6_IFF_DEPRECATED)) goto replace; /* * Rule 4: Prefer home addresses. * We do not support home addresses. */ /* Rule 5: Prefer outgoing interface */ if (ia6_best->ia_ifp == oifp && ifp != oifp) continue; if (ia6_best->ia_ifp != oifp && ifp == oifp) goto replace; /* * Rule 5.5: Prefer addresses in a prefix advertised * by the next-hop. * We do not track this information. */ /* * Rule 6: Prefer matching label. * We do not implement policy tables. */ /* Rule 7: Prefer temporary addresses. */ if ((ia6_best->ia6_flags & IN6_IFF_TEMPORARY) && !(ifatoia6(ifa)->ia6_flags & IN6_IFF_TEMPORARY)) continue; if (!(ia6_best->ia6_flags & IN6_IFF_TEMPORARY) && (ifatoia6(ifa)->ia6_flags & IN6_IFF_TEMPORARY)) goto replace; /* Rule 8: Use longest matching prefix. */ tlen = in6_matchlen(IFA_IN6(ifa), dst); if (tlen > blen) { #if NCARP > 0 /* * Don't let carp interfaces win a tie against * the output interface based on matchlen. * We should only use a carp address if no * other interface has a usable address. * Otherwise, when communicating from a carp * master to a carp backup, the backup system * won't respond since the carp address is also * configured as a local address on the backup. * Note that carp interfaces in backup state * were already skipped above. */ if (ifp->if_type == IFT_CARP && oifp->if_type != IFT_CARP) continue; #endif goto replace; } else if (tlen < blen) continue; /* * If the eight rules fail to choose a single address, * the tiebreaker is implementation-specific. */ /* Prefer address with highest pltime. */ if (ia6_best->ia6_updatetime + ia6_best->ia6_lifetime.ia6t_pltime < ifatoia6(ifa)->ia6_updatetime + ifatoia6(ifa)->ia6_lifetime.ia6t_pltime) goto replace; else if (ia6_best->ia6_updatetime + ia6_best->ia6_lifetime.ia6t_pltime > ifatoia6(ifa)->ia6_updatetime + ifatoia6(ifa)->ia6_lifetime.ia6t_pltime) continue; /* Prefer address with highest vltime. */ if (ia6_best->ia6_updatetime + ia6_best->ia6_lifetime.ia6t_vltime < ifatoia6(ifa)->ia6_updatetime + ifatoia6(ifa)->ia6_lifetime.ia6t_vltime) goto replace; else if (ia6_best->ia6_updatetime + ia6_best->ia6_lifetime.ia6t_vltime > ifatoia6(ifa)->ia6_updatetime + ifatoia6(ifa)->ia6_lifetime.ia6t_vltime) continue; continue; replace: ia6_best = ifatoia6(ifa); blen = tlen >= 0 ? tlen : in6_matchlen(IFA_IN6(ifa), dst); best_scope = in6_addrscope(&ia6_best->ia_addr.sin6_addr); } } /* count statistics for future improvements */ if (ia6_best == NULL) ip6stat_inc(ip6s_sources_none); else { if (oifp == ia6_best->ia_ifp) ip6stat_inc(ip6s_sources_sameif + best_scope); else ip6stat_inc(ip6s_sources_otherif + best_scope); if (best_scope == dst_scope) ip6stat_inc(ip6s_sources_samescope + best_scope); else ip6stat_inc(ip6s_sources_otherscope + best_scope); if ((ia6_best->ia6_flags & IN6_IFF_DEPRECATED) != 0) ip6stat_inc(ip6s_sources_deprecated + best_scope); } return (ia6_best); } int in6if_do_dad(struct ifnet *ifp) { if ((ifp->if_flags & IFF_LOOPBACK) != 0) return (0); switch (ifp->if_type) { #if NCARP > 0 case IFT_CARP: /* * XXX: DAD does not work currently on carp(4) * so disable it for now. */ return (0); #endif default: /* * Our DAD routine requires the interface up and running. * However, some interfaces can be up before the RUNNING * status. Additionally, users may try to assign addresses * before the interface becomes up (or running). * We simply skip DAD in such a case as a work around. * XXX: we should rather mark "tentative" on such addresses, * and do DAD after the interface becomes ready. */ if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) return (0); return (1); } } void * in6_domifattach(struct ifnet *ifp) { struct in6_ifextra *ext; ext = malloc(sizeof(*ext), M_IFADDR, M_WAITOK | M_ZERO); ext->nd_ifinfo = nd6_ifattach(ifp); ext->nprefixes = 0; ext->ndefrouters = 0; return ext; } void in6_domifdetach(struct ifnet *ifp, void *aux) { struct in6_ifextra *ext = (struct in6_ifextra *)aux; nd6_ifdetach(ext->nd_ifinfo); free(ext, M_IFADDR, sizeof(*ext)); }