Index: head/sys/netinet6/nd6_rtr.c =================================================================== --- head/sys/netinet6/nd6_rtr.c (revision 354860) +++ head/sys/netinet6/nd6_rtr.c (revision 354861) @@ -1,2652 +1,2637 @@ /*- * SPDX-License-Identifier: BSD-3-Clause * * 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. * * $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $ */ #include __FBSDID("$FreeBSD$"); #include "opt_inet.h" #include "opt_inet6.h" #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 #include #include #include #include #include #include #include #include -static int rtpref(struct nd_defrouter *); static struct nd_defrouter *defrtrlist_update(struct nd_defrouter *); static int prelist_update(struct nd_prefixctl *, struct nd_defrouter *, struct mbuf *, int); -static struct in6_ifaddr *in6_ifadd(struct nd_prefixctl *, int); -static struct nd_pfxrouter *pfxrtr_lookup(struct nd_prefix *, - struct nd_defrouter *); -static void pfxrtr_add(struct nd_prefix *, struct nd_defrouter *); -static void pfxrtr_del(struct nd_pfxrouter *); -static struct nd_pfxrouter *find_pfxlist_reachable_router(struct nd_prefix *); -static void defrouter_delreq(struct nd_defrouter *); -static void nd6_rtmsg(int, struct rtentry *); -static int in6_init_prefix_ltimes(struct nd_prefix *); -static void in6_init_address_ltimes(struct nd_prefix *, - struct in6_addrlifetime *); - -static int rt6_deleteroute(const struct rtentry *, void *); - TAILQ_HEAD(nd6_drhead, nd_defrouter); VNET_DEFINE_STATIC(struct nd6_drhead, nd6_defrouter); #define V_nd6_defrouter VNET(nd6_defrouter) VNET_DECLARE(int, nd6_recalc_reachtm_interval); #define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval) VNET_DEFINE_STATIC(struct ifnet *, nd6_defifp); VNET_DEFINE(int, nd6_defifindex); #define V_nd6_defifp VNET(nd6_defifp) VNET_DEFINE(int, ip6_use_tempaddr) = 0; VNET_DEFINE(int, ip6_desync_factor); VNET_DEFINE(u_int32_t, ip6_temp_preferred_lifetime) = DEF_TEMP_PREFERRED_LIFETIME; VNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime) = DEF_TEMP_VALID_LIFETIME; VNET_DEFINE(int, ip6_temp_regen_advance) = TEMPADDR_REGEN_ADVANCE; #ifdef EXPERIMENTAL VNET_DEFINE(int, nd6_ignore_ipv6_only_ra) = 1; #endif +SYSCTL_DECL(_net_inet6_icmp6); + /* RTPREF_MEDIUM has to be 0! */ #define RTPREF_HIGH 1 #define RTPREF_MEDIUM 0 #define RTPREF_LOW (-1) #define RTPREF_RESERVED (-2) #define RTPREF_INVALID (-3) /* internal */ static void defrouter_ref(struct nd_defrouter *dr) { refcount_acquire(&dr->refcnt); } void defrouter_rele(struct nd_defrouter *dr) { if (refcount_release(&dr->refcnt)) free(dr, M_IP6NDP); } /* * Remove a router from the global list and optionally stash it in a * caller-supplied queue. */ static void defrouter_unlink(struct nd_defrouter *dr, struct nd6_drhead *drq) { ND6_WLOCK_ASSERT(); TAILQ_REMOVE(&V_nd6_defrouter, dr, dr_entry); V_nd6_list_genid++; if (drq != NULL) TAILQ_INSERT_TAIL(drq, dr, dr_entry); } /* * Receive Router Solicitation Message - just for routers. * Router solicitation/advertisement is mostly managed by userland program * (rtadvd) so here we have no function like nd6_ra_output(). * * Based on RFC 2461 */ void nd6_rs_input(struct mbuf *m, int off, int icmp6len) { struct ifnet *ifp; struct ip6_hdr *ip6; struct nd_router_solicit *nd_rs; struct in6_addr saddr6; union nd_opts ndopts; char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; char *lladdr; int lladdrlen; ifp = m->m_pkthdr.rcvif; /* * Accept RS only when V_ip6_forwarding=1 and the interface has * no ND6_IFF_ACCEPT_RTADV. */ if (!V_ip6_forwarding || ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) goto freeit; /* RFC 6980: Nodes MUST silently ignore fragments */ if(m->m_flags & M_FRAGMENTED) goto freeit; /* Sanity checks */ ip6 = mtod(m, struct ip6_hdr *); if (ip6->ip6_hlim != 255) { nd6log((LOG_ERR, "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n", ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); goto bad; } /* * Don't update the neighbor cache, if src = ::. * This indicates that the src has no IP address assigned yet. */ saddr6 = ip6->ip6_src; if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) goto freeit; m = m_pullup(m, off + icmp6len); if (m == NULL) { IP6STAT_INC(ip6s_exthdrtoolong); return; } ip6 = mtod(m, struct ip6_hdr *); nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off); icmp6len -= sizeof(*nd_rs); nd6_option_init(nd_rs + 1, icmp6len, &ndopts); if (nd6_options(&ndopts) < 0) { nd6log((LOG_INFO, "nd6_rs_input: invalid ND option, ignored\n")); /* nd6_options have incremented stats */ goto freeit; } lladdr = NULL; lladdrlen = 0; if (ndopts.nd_opts_src_lladdr) { lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; } if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { nd6log((LOG_INFO, "nd6_rs_input: lladdrlen mismatch for %s " "(if %d, RS packet %d)\n", ip6_sprintf(ip6bufs, &saddr6), ifp->if_addrlen, lladdrlen - 2)); goto bad; } nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0); freeit: m_freem(m); return; bad: ICMP6STAT_INC(icp6s_badrs); m_freem(m); } #ifdef EXPERIMENTAL /* * An initial update routine for draft-ietf-6man-ipv6only-flag. * We need to iterate over all default routers for the given * interface to see whether they are all advertising the "S" * (IPv6-Only) flag. If they do set, otherwise unset, the * interface flag we later use to filter on. */ static void defrtr_ipv6_only_ifp(struct ifnet *ifp) { struct nd_defrouter *dr; bool ipv6_only, ipv6_only_old; #ifdef INET struct epoch_tracker et; struct ifaddr *ifa; bool has_ipv4_addr; #endif if (V_nd6_ignore_ipv6_only_ra != 0) return; ipv6_only = true; ND6_RLOCK(); TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) if (dr->ifp == ifp && (dr->raflags & ND_RA_FLAG_IPV6_ONLY) == 0) ipv6_only = false; ND6_RUNLOCK(); IF_AFDATA_WLOCK(ifp); ipv6_only_old = ND_IFINFO(ifp)->flags & ND6_IFF_IPV6_ONLY; IF_AFDATA_WUNLOCK(ifp); /* If nothing changed, we have an early exit. */ if (ipv6_only == ipv6_only_old) return; #ifdef INET /* * Should we want to set the IPV6-ONLY flag, check if the * interface has a non-0/0 and non-link-local IPv4 address * configured on it. If it has we will assume working * IPv4 operations and will clear the interface flag. */ has_ipv4_addr = false; if (ipv6_only) { NET_EPOCH_ENTER(et); CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { if (ifa->ifa_addr->sa_family != AF_INET) continue; if (in_canforward( satosin(ifa->ifa_addr)->sin_addr)) { has_ipv4_addr = true; break; } } NET_EPOCH_EXIT(et); } if (ipv6_only && has_ipv4_addr) { log(LOG_NOTICE, "%s rcvd RA w/ IPv6-Only flag set but has IPv4 " "configured, ignoring IPv6-Only flag.\n", ifp->if_xname); ipv6_only = false; } #endif IF_AFDATA_WLOCK(ifp); if (ipv6_only) ND_IFINFO(ifp)->flags |= ND6_IFF_IPV6_ONLY; else ND_IFINFO(ifp)->flags &= ~ND6_IFF_IPV6_ONLY; IF_AFDATA_WUNLOCK(ifp); #ifdef notyet /* Send notification of flag change. */ #endif } static void defrtr_ipv6_only_ipf_down(struct ifnet *ifp) { IF_AFDATA_WLOCK(ifp); ND_IFINFO(ifp)->flags &= ~ND6_IFF_IPV6_ONLY; IF_AFDATA_WUNLOCK(ifp); } #endif /* EXPERIMENTAL */ void nd6_ifnet_link_event(void *arg __unused, struct ifnet *ifp, int linkstate) { /* * XXX-BZ we might want to trigger re-evaluation of our default router * availability. E.g., on link down the default router might be * unreachable but a different interface might still have connectivity. */ #ifdef EXPERIMENTAL if (linkstate == LINK_STATE_DOWN) defrtr_ipv6_only_ipf_down(ifp); #endif } /* * Receive Router Advertisement Message. * * Based on RFC 2461 * TODO: on-link bit on prefix information * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing */ void nd6_ra_input(struct mbuf *m, int off, int icmp6len) { struct ifnet *ifp; struct nd_ifinfo *ndi; struct ip6_hdr *ip6; struct nd_router_advert *nd_ra; struct in6_addr saddr6; struct nd_defrouter *dr; union nd_opts ndopts; char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; int mcast; /* * We only accept RAs only when the per-interface flag * ND6_IFF_ACCEPT_RTADV is on the receiving interface. */ ifp = m->m_pkthdr.rcvif; ndi = ND_IFINFO(ifp); if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV)) goto freeit; /* RFC 6980: Nodes MUST silently ignore fragments */ if(m->m_flags & M_FRAGMENTED) goto freeit; ip6 = mtod(m, struct ip6_hdr *); if (ip6->ip6_hlim != 255) { nd6log((LOG_ERR, "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n", ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); goto bad; } saddr6 = ip6->ip6_src; if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { nd6log((LOG_ERR, "nd6_ra_input: src %s is not link-local\n", ip6_sprintf(ip6bufs, &saddr6))); goto bad; } m = m_pullup(m, off + icmp6len); if (m == NULL) { IP6STAT_INC(ip6s_exthdrtoolong); return; } ip6 = mtod(m, struct ip6_hdr *); nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); icmp6len -= sizeof(*nd_ra); nd6_option_init(nd_ra + 1, icmp6len, &ndopts); if (nd6_options(&ndopts) < 0) { nd6log((LOG_INFO, "nd6_ra_input: invalid ND option, ignored\n")); /* nd6_options have incremented stats */ goto freeit; } mcast = 0; dr = NULL; { struct nd_defrouter dr0; u_int32_t advreachable = nd_ra->nd_ra_reachable; /* remember if this is a multicasted advertisement */ if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) mcast = 1; bzero(&dr0, sizeof(dr0)); dr0.rtaddr = saddr6; dr0.raflags = nd_ra->nd_ra_flags_reserved; /* * Effectively-disable routes from RA messages when * ND6_IFF_NO_RADR enabled on the receiving interface or * (ip6.forwarding == 1 && ip6.rfc6204w3 != 1). */ if (ndi->flags & ND6_IFF_NO_RADR) dr0.rtlifetime = 0; else if (V_ip6_forwarding && !V_ip6_rfc6204w3) dr0.rtlifetime = 0; else dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); dr0.expire = time_uptime + dr0.rtlifetime; dr0.ifp = ifp; /* unspecified or not? (RFC 2461 6.3.4) */ if (advreachable) { advreachable = ntohl(advreachable); if (advreachable <= MAX_REACHABLE_TIME && ndi->basereachable != advreachable) { ndi->basereachable = advreachable; ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable); ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */ } } if (nd_ra->nd_ra_retransmit) ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); if (nd_ra->nd_ra_curhoplimit) { if (ndi->chlim < nd_ra->nd_ra_curhoplimit) ndi->chlim = nd_ra->nd_ra_curhoplimit; else if (ndi->chlim != nd_ra->nd_ra_curhoplimit) { log(LOG_ERR, "RA with a lower CurHopLimit sent from " "%s on %s (current = %d, received = %d). " "Ignored.\n", ip6_sprintf(ip6bufs, &ip6->ip6_src), if_name(ifp), ndi->chlim, nd_ra->nd_ra_curhoplimit); } } dr = defrtrlist_update(&dr0); #ifdef EXPERIMENTAL defrtr_ipv6_only_ifp(ifp); #endif } /* * prefix */ if (ndopts.nd_opts_pi) { struct nd_opt_hdr *pt; struct nd_opt_prefix_info *pi = NULL; struct nd_prefixctl pr; for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; pt = (struct nd_opt_hdr *)((caddr_t)pt + (pt->nd_opt_len << 3))) { if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) continue; pi = (struct nd_opt_prefix_info *)pt; if (pi->nd_opt_pi_len != 4) { nd6log((LOG_INFO, "nd6_ra_input: invalid option " "len %d for prefix information option, " "ignored\n", pi->nd_opt_pi_len)); continue; } if (128 < pi->nd_opt_pi_prefix_len) { nd6log((LOG_INFO, "nd6_ra_input: invalid prefix " "len %d for prefix information option, " "ignored\n", pi->nd_opt_pi_prefix_len)); continue; } if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { nd6log((LOG_INFO, "nd6_ra_input: invalid prefix " "%s, ignored\n", ip6_sprintf(ip6bufs, &pi->nd_opt_pi_prefix))); continue; } bzero(&pr, sizeof(pr)); pr.ndpr_prefix.sin6_family = AF_INET6; pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix); pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix; pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif; pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_AUTO) ? 1 : 0; pr.ndpr_plen = pi->nd_opt_pi_prefix_len; pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time); pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time); (void)prelist_update(&pr, dr, m, mcast); } } if (dr != NULL) { defrouter_rele(dr); dr = NULL; } /* * MTU */ if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { u_long mtu; u_long maxmtu; mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); /* lower bound */ if (mtu < IPV6_MMTU) { nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option " "mtu=%lu sent from %s, ignoring\n", mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src))); goto skip; } /* upper bound */ maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu) ? ndi->maxmtu : ifp->if_mtu; if (mtu <= maxmtu) { int change = (ndi->linkmtu != mtu); ndi->linkmtu = mtu; if (change) { /* in6_maxmtu may change */ in6_setmaxmtu(); rt_updatemtu(ifp); } } else { nd6log((LOG_INFO, "nd6_ra_input: bogus mtu " "mtu=%lu sent from %s; " "exceeds maxmtu %lu, ignoring\n", mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu)); } } skip: /* * Source link layer address */ { char *lladdr = NULL; int lladdrlen = 0; if (ndopts.nd_opts_src_lladdr) { lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; } if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { nd6log((LOG_INFO, "nd6_ra_input: lladdrlen mismatch for %s " "(if %d, RA packet %d)\n", ip6_sprintf(ip6bufs, &saddr6), ifp->if_addrlen, lladdrlen - 2)); goto bad; } nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0); /* * Installing a link-layer address might change the state of the * router's neighbor cache, which might also affect our on-link * detection of adveritsed prefixes. */ pfxlist_onlink_check(); } freeit: m_freem(m); return; bad: ICMP6STAT_INC(icp6s_badra); m_freem(m); } /* tell the change to user processes watching the routing socket. */ static void nd6_rtmsg(int cmd, struct rtentry *rt) { struct rt_addrinfo info; struct ifnet *ifp; struct ifaddr *ifa; bzero((caddr_t)&info, sizeof(info)); info.rti_info[RTAX_DST] = rt_key(rt); info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; info.rti_info[RTAX_NETMASK] = rt_mask(rt); ifp = rt->rt_ifp; if (ifp != NULL) { struct epoch_tracker et; NET_EPOCH_ENTER(et); ifa = CK_STAILQ_FIRST(&ifp->if_addrhead); info.rti_info[RTAX_IFP] = ifa->ifa_addr; ifa_ref(ifa); NET_EPOCH_EXIT(et); info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; } else ifa = NULL; rt_missmsg_fib(cmd, &info, rt->rt_flags, 0, rt->rt_fibnum); if (ifa != NULL) ifa_free(ifa); } -/* - * default router list processing sub routines - */ +/* PFXRTR */ +static struct nd_pfxrouter * +pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr) +{ + struct nd_pfxrouter *search; + ND6_LOCK_ASSERT(); + + LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) { + if (search->router == dr) + break; + } + return (search); +} + static void +pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr) +{ + struct nd_pfxrouter *new; + bool update; + + ND6_UNLOCK_ASSERT(); + + ND6_RLOCK(); + if (pfxrtr_lookup(pr, dr) != NULL) { + ND6_RUNLOCK(); + return; + } + ND6_RUNLOCK(); + + new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO); + if (new == NULL) + return; + defrouter_ref(dr); + new->router = dr; + + ND6_WLOCK(); + if (pfxrtr_lookup(pr, dr) == NULL) { + LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); + update = true; + } else { + /* We lost a race to add the reference. */ + defrouter_rele(dr); + free(new, M_IP6NDP); + update = false; + } + ND6_WUNLOCK(); + + if (update) + pfxlist_onlink_check(); +} + +static void +pfxrtr_del(struct nd_pfxrouter *pfr) +{ + + ND6_WLOCK_ASSERT(); + + LIST_REMOVE(pfr, pfr_entry); + defrouter_rele(pfr->router); + free(pfr, M_IP6NDP); +} + + +/* Default router list processing sub routines. */ +static void defrouter_addreq(struct nd_defrouter *new) { struct sockaddr_in6 def, mask, gate; struct rtentry *newrt = NULL; int error; bzero(&def, sizeof(def)); bzero(&mask, sizeof(mask)); bzero(&gate, sizeof(gate)); def.sin6_len = mask.sin6_len = gate.sin6_len = sizeof(struct sockaddr_in6); def.sin6_family = gate.sin6_family = AF_INET6; gate.sin6_addr = new->rtaddr; error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&def, (struct sockaddr *)&gate, (struct sockaddr *)&mask, RTF_GATEWAY, &newrt, new->ifp->if_fib); if (newrt) { nd6_rtmsg(RTM_ADD, newrt); /* tell user process */ RTFREE(newrt); } if (error == 0) new->installed = 1; } -struct nd_defrouter * -defrouter_lookup_locked(struct in6_addr *addr, struct ifnet *ifp) -{ - struct nd_defrouter *dr; - - ND6_LOCK_ASSERT(); - TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) - if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) { - defrouter_ref(dr); - return (dr); - } - return (NULL); -} - -struct nd_defrouter * -defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp) -{ - struct nd_defrouter *dr; - - ND6_RLOCK(); - dr = defrouter_lookup_locked(addr, ifp); - ND6_RUNLOCK(); - return (dr); -} - /* * Remove the default route for a given router. * This is just a subroutine function for defrouter_select_fib(), and * should not be called from anywhere else. */ static void defrouter_delreq(struct nd_defrouter *dr) { struct sockaddr_in6 def, mask, gate; struct rtentry *oldrt = NULL; bzero(&def, sizeof(def)); bzero(&mask, sizeof(mask)); bzero(&gate, sizeof(gate)); def.sin6_len = mask.sin6_len = gate.sin6_len = sizeof(struct sockaddr_in6); def.sin6_family = gate.sin6_family = AF_INET6; gate.sin6_addr = dr->rtaddr; in6_rtrequest(RTM_DELETE, (struct sockaddr *)&def, (struct sockaddr *)&gate, (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt, dr->ifp->if_fib); if (oldrt) { nd6_rtmsg(RTM_DELETE, oldrt); RTFREE(oldrt); } dr->installed = 0; } -/* - * Remove all default routes from default router list. - */ -void -defrouter_reset(void) -{ - struct nd_defrouter *dr, **dra; - int count, i; - - count = i = 0; - - /* - * We can't delete routes with the ND lock held, so make a copy of the - * current default router list and use that when deleting routes. - */ - ND6_RLOCK(); - TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) - count++; - ND6_RUNLOCK(); - - dra = malloc(count * sizeof(*dra), M_TEMP, M_WAITOK | M_ZERO); - - ND6_RLOCK(); - TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) { - if (i == count) - break; - defrouter_ref(dr); - dra[i++] = dr; - } - ND6_RUNLOCK(); - - for (i = 0; i < count && dra[i] != NULL; i++) { - defrouter_delreq(dra[i]); - defrouter_rele(dra[i]); - } - free(dra, M_TEMP); - - /* - * XXX should we also nuke any default routers in the kernel, by - * going through them by rtalloc1()? - */ -} - static void defrouter_del(struct nd_defrouter *dr) { struct nd_defrouter *deldr = NULL; struct nd_prefix *pr; struct nd_pfxrouter *pfxrtr; ND6_UNLOCK_ASSERT(); /* * Flush all the routing table entries that use the router * as a next hop. */ if (ND_IFINFO(dr->ifp)->flags & ND6_IFF_ACCEPT_RTADV) rt6_flush(&dr->rtaddr, dr->ifp); #ifdef EXPERIMENTAL defrtr_ipv6_only_ifp(dr->ifp); #endif if (dr->installed) { deldr = dr; defrouter_delreq(dr); } /* * Also delete all the pointers to the router in each prefix lists. */ ND6_WLOCK(); LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL) pfxrtr_del(pfxrtr); } ND6_WUNLOCK(); pfxlist_onlink_check(); /* * If the router is the primary one, choose a new one. * Note that defrouter_select_fib() will remove the current * gateway from the routing table. */ if (deldr) defrouter_select_fib(deldr->ifp->if_fib); /* * Release the list reference. */ defrouter_rele(dr); } +struct nd_defrouter * +defrouter_lookup_locked(struct in6_addr *addr, struct ifnet *ifp) +{ + struct nd_defrouter *dr; + + ND6_LOCK_ASSERT(); + TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) + if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) { + defrouter_ref(dr); + return (dr); + } + return (NULL); +} + +struct nd_defrouter * +defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp) +{ + struct nd_defrouter *dr; + + ND6_RLOCK(); + dr = defrouter_lookup_locked(addr, ifp); + ND6_RUNLOCK(); + return (dr); +} + /* + * Remove all default routes from default router list. + */ +void +defrouter_reset(void) +{ + struct nd_defrouter *dr, **dra; + int count, i; + + count = i = 0; + + /* + * We can't delete routes with the ND lock held, so make a copy of the + * current default router list and use that when deleting routes. + */ + ND6_RLOCK(); + TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) + count++; + ND6_RUNLOCK(); + + dra = malloc(count * sizeof(*dra), M_TEMP, M_WAITOK | M_ZERO); + + ND6_RLOCK(); + TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) { + if (i == count) + break; + defrouter_ref(dr); + dra[i++] = dr; + } + ND6_RUNLOCK(); + + for (i = 0; i < count && dra[i] != NULL; i++) { + defrouter_delreq(dra[i]); + defrouter_rele(dra[i]); + } + free(dra, M_TEMP); + + /* + * XXX should we also nuke any default routers in the kernel, by + * going through them by rtalloc1()? + */ +} + +/* * Look up a matching default router list entry and remove it. Returns true if a * matching entry was found, false otherwise. */ bool defrouter_remove(struct in6_addr *addr, struct ifnet *ifp) { struct nd_defrouter *dr; ND6_WLOCK(); dr = defrouter_lookup_locked(addr, ifp); if (dr == NULL) { ND6_WUNLOCK(); return (false); } defrouter_unlink(dr, NULL); ND6_WUNLOCK(); defrouter_del(dr); defrouter_rele(dr); return (true); } /* + * for default router selection + * regards router-preference field as a 2-bit signed integer + */ +static int +rtpref(struct nd_defrouter *dr) +{ + switch (dr->raflags & ND_RA_FLAG_RTPREF_MASK) { + case ND_RA_FLAG_RTPREF_HIGH: + return (RTPREF_HIGH); + case ND_RA_FLAG_RTPREF_MEDIUM: + case ND_RA_FLAG_RTPREF_RSV: + return (RTPREF_MEDIUM); + case ND_RA_FLAG_RTPREF_LOW: + return (RTPREF_LOW); + default: + /* + * This case should never happen. If it did, it would mean a + * serious bug of kernel internal. We thus always bark here. + * Or, can we even panic? + */ + log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->raflags); + return (RTPREF_INVALID); + } + /* NOTREACHED */ +} + +/* * Default Router Selection according to Section 6.3.6 of RFC 2461 and * draft-ietf-ipngwg-router-selection: * 1) Routers that are reachable or probably reachable should be preferred. * If we have more than one (probably) reachable router, prefer ones * with the highest router preference. * 2) When no routers on the list are known to be reachable or * probably reachable, routers SHOULD be selected in a round-robin * fashion, regardless of router preference values. * 3) If the Default Router List is empty, assume that all * destinations are on-link. * * We assume nd_defrouter is sorted by router preference value. * Since the code below covers both with and without router preference cases, * we do not need to classify the cases by ifdef. * * At this moment, we do not try to install more than one default router, * even when the multipath routing is available, because we're not sure about * the benefits for stub hosts comparing to the risk of making the code * complicated and the possibility of introducing bugs. * * We maintain a single list of routers for multiple FIBs, only considering one * at a time based on the receiving interface's FIB. If @fibnum is RT_ALL_FIBS, * we do the whole thing multiple times. */ void defrouter_select_fib(int fibnum) { struct epoch_tracker et; struct nd_defrouter *dr, *selected_dr, *installed_dr; struct llentry *ln = NULL; if (fibnum == RT_ALL_FIBS) { for (fibnum = 0; fibnum < rt_numfibs; fibnum++) { defrouter_select_fib(fibnum); } } ND6_RLOCK(); /* * Let's handle easy case (3) first: * If default router list is empty, there's nothing to be done. */ if (TAILQ_EMPTY(&V_nd6_defrouter)) { ND6_RUNLOCK(); return; } /* * Search for a (probably) reachable router from the list. * We just pick up the first reachable one (if any), assuming that * the ordering rule of the list described in defrtrlist_update(). */ selected_dr = installed_dr = NULL; TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) { NET_EPOCH_ENTER(et); if (selected_dr == NULL && dr->ifp->if_fib == fibnum && (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) && ND6_IS_LLINFO_PROBREACH(ln)) { selected_dr = dr; defrouter_ref(selected_dr); } NET_EPOCH_EXIT(et); if (ln != NULL) { LLE_RUNLOCK(ln); ln = NULL; } if (dr->installed && dr->ifp->if_fib == fibnum) { if (installed_dr == NULL) { installed_dr = dr; defrouter_ref(installed_dr); } else { /* * this should not happen. * warn for diagnosis. */ log(LOG_ERR, "defrouter_select_fib: more than " "one router is installed\n"); } } } /* * If none of the default routers was found to be reachable, * round-robin the list regardless of preference. * Otherwise, if we have an installed router, check if the selected * (reachable) router should really be preferred to the installed one. * We only prefer the new router when the old one is not reachable * or when the new one has a really higher preference value. */ if (selected_dr == NULL) { if (installed_dr == NULL || TAILQ_NEXT(installed_dr, dr_entry) == NULL) dr = TAILQ_FIRST(&V_nd6_defrouter); else dr = TAILQ_NEXT(installed_dr, dr_entry); /* Ensure we select a router for this FIB. */ TAILQ_FOREACH_FROM(dr, &V_nd6_defrouter, dr_entry) { if (dr->ifp->if_fib == fibnum) { selected_dr = dr; defrouter_ref(selected_dr); break; } } } else if (installed_dr != NULL) { NET_EPOCH_ENTER(et); if ((ln = nd6_lookup(&installed_dr->rtaddr, 0, installed_dr->ifp)) && ND6_IS_LLINFO_PROBREACH(ln) && installed_dr->ifp->if_fib == fibnum && rtpref(selected_dr) <= rtpref(installed_dr)) { defrouter_rele(selected_dr); selected_dr = installed_dr; } NET_EPOCH_EXIT(et); if (ln != NULL) LLE_RUNLOCK(ln); } ND6_RUNLOCK(); /* * If we selected a router for this FIB and it's different * than the installed one, remove the installed router and * install the selected one in its place. */ if (installed_dr != selected_dr) { if (installed_dr != NULL) { defrouter_delreq(installed_dr); defrouter_rele(installed_dr); } if (selected_dr != NULL) defrouter_addreq(selected_dr); } if (selected_dr != NULL) defrouter_rele(selected_dr); } -/* - * for default router selection - * regards router-preference field as a 2-bit signed integer - */ -static int -rtpref(struct nd_defrouter *dr) -{ - switch (dr->raflags & ND_RA_FLAG_RTPREF_MASK) { - case ND_RA_FLAG_RTPREF_HIGH: - return (RTPREF_HIGH); - case ND_RA_FLAG_RTPREF_MEDIUM: - case ND_RA_FLAG_RTPREF_RSV: - return (RTPREF_MEDIUM); - case ND_RA_FLAG_RTPREF_LOW: - return (RTPREF_LOW); - default: - /* - * This case should never happen. If it did, it would mean a - * serious bug of kernel internal. We thus always bark here. - * Or, can we even panic? - */ - log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->raflags); - return (RTPREF_INVALID); - } - /* NOTREACHED */ -} - static struct nd_defrouter * defrtrlist_update(struct nd_defrouter *new) { struct nd_defrouter *dr, *n; uint64_t genid; int oldpref; bool writelocked; if (new->rtlifetime == 0) { defrouter_remove(&new->rtaddr, new->ifp); return (NULL); } ND6_RLOCK(); writelocked = false; restart: dr = defrouter_lookup_locked(&new->rtaddr, new->ifp); if (dr != NULL) { oldpref = rtpref(dr); /* override */ dr->raflags = new->raflags; /* XXX flag check */ dr->rtlifetime = new->rtlifetime; dr->expire = new->expire; /* * If the preference does not change, there's no need * to sort the entries. Also make sure the selected * router is still installed in the kernel. */ if (dr->installed && rtpref(new) == oldpref) { if (writelocked) ND6_WUNLOCK(); else ND6_RUNLOCK(); return (dr); } } /* * The router needs to be reinserted into the default router * list, so upgrade to a write lock. If that fails and the list * has potentially changed while the lock was dropped, we'll * redo the lookup with the write lock held. */ if (!writelocked) { writelocked = true; if (!ND6_TRY_UPGRADE()) { genid = V_nd6_list_genid; ND6_RUNLOCK(); ND6_WLOCK(); if (genid != V_nd6_list_genid) goto restart; } } if (dr != NULL) { /* * The preferred router may have changed, so relocate this * router. */ TAILQ_REMOVE(&V_nd6_defrouter, dr, dr_entry); n = dr; } else { n = malloc(sizeof(*n), M_IP6NDP, M_NOWAIT | M_ZERO); if (n == NULL) { ND6_WUNLOCK(); return (NULL); } memcpy(n, new, sizeof(*n)); /* Initialize with an extra reference for the caller. */ refcount_init(&n->refcnt, 2); } /* * Insert the new router in the Default Router List; * The Default Router List should be in the descending order * of router-preferece. Routers with the same preference are * sorted in the arriving time order. */ /* insert at the end of the group */ TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) { if (rtpref(n) > rtpref(dr)) break; } if (dr != NULL) TAILQ_INSERT_BEFORE(dr, n, dr_entry); else TAILQ_INSERT_TAIL(&V_nd6_defrouter, n, dr_entry); V_nd6_list_genid++; ND6_WUNLOCK(); defrouter_select_fib(new->ifp->if_fib); return (n); } -static struct nd_pfxrouter * -pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr) +static int +in6_init_prefix_ltimes(struct nd_prefix *ndpr) { - struct nd_pfxrouter *search; + if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) + ndpr->ndpr_preferred = 0; + else + ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime; + if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) + ndpr->ndpr_expire = 0; + else + ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime; - ND6_LOCK_ASSERT(); + return 0; +} - LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) { - if (search->router == dr) - break; +static void +in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6) +{ + /* init ia6t_expire */ + if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) + lt6->ia6t_expire = 0; + else { + lt6->ia6t_expire = time_uptime; + lt6->ia6t_expire += lt6->ia6t_vltime; } - return (search); + + /* init ia6t_preferred */ + if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) + lt6->ia6t_preferred = 0; + else { + lt6->ia6t_preferred = time_uptime; + lt6->ia6t_preferred += lt6->ia6t_pltime; + } } -static void -pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr) +static struct in6_ifaddr * +in6_ifadd(struct nd_prefixctl *pr, int mcast) { - struct nd_pfxrouter *new; - bool update; + struct ifnet *ifp = pr->ndpr_ifp; + struct ifaddr *ifa; + struct in6_aliasreq ifra; + struct in6_ifaddr *ia, *ib; + int error, plen0; + struct in6_addr mask; + int prefixlen = pr->ndpr_plen; + int updateflags; + char ip6buf[INET6_ADDRSTRLEN]; - ND6_UNLOCK_ASSERT(); + in6_prefixlen2mask(&mask, prefixlen); - ND6_RLOCK(); - if (pfxrtr_lookup(pr, dr) != NULL) { - ND6_RUNLOCK(); - return; + /* + * find a link-local address (will be interface ID). + * Is it really mandatory? Theoretically, a global or a site-local + * address can be configured without a link-local address, if we + * have a unique interface identifier... + * + * it is not mandatory to have a link-local address, we can generate + * interface identifier on the fly. we do this because: + * (1) it should be the easiest way to find interface identifier. + * (2) RFC2462 5.4 suggesting the use of the same interface identifier + * for multiple addresses on a single interface, and possible shortcut + * of DAD. we omitted DAD for this reason in the past. + * (3) a user can prevent autoconfiguration of global address + * by removing link-local address by hand (this is partly because we + * don't have other way to control the use of IPv6 on an interface. + * this has been our design choice - cf. NRL's "ifconfig auto"). + * (4) it is easier to manage when an interface has addresses + * with the same interface identifier, than to have multiple addresses + * with different interface identifiers. + */ + ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */ + if (ifa) + ib = (struct in6_ifaddr *)ifa; + else + return NULL; + + /* prefixlen + ifidlen must be equal to 128 */ + plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL); + if (prefixlen != plen0) { + ifa_free(ifa); + nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s " + "(prefix=%d ifid=%d)\n", + if_name(ifp), prefixlen, 128 - plen0)); + return NULL; } - ND6_RUNLOCK(); - new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO); - if (new == NULL) - return; - defrouter_ref(dr); - new->router = dr; + /* make ifaddr */ + in6_prepare_ifra(&ifra, &pr->ndpr_prefix.sin6_addr, &mask); - ND6_WLOCK(); - if (pfxrtr_lookup(pr, dr) == NULL) { - LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); - update = true; - } else { - /* We lost a race to add the reference. */ - defrouter_rele(dr); - free(new, M_IP6NDP); - update = false; - } - ND6_WUNLOCK(); + IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr, &mask); + /* interface ID */ + ifra.ifra_addr.sin6_addr.s6_addr32[0] |= + (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]); + ifra.ifra_addr.sin6_addr.s6_addr32[1] |= + (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]); + ifra.ifra_addr.sin6_addr.s6_addr32[2] |= + (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]); + ifra.ifra_addr.sin6_addr.s6_addr32[3] |= + (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]); + ifa_free(ifa); - if (update) - pfxlist_onlink_check(); -} + /* lifetimes. */ + ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime; + ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime; -static void -pfxrtr_del(struct nd_pfxrouter *pfr) -{ + /* XXX: scope zone ID? */ - ND6_WLOCK_ASSERT(); + ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */ - LIST_REMOVE(pfr, pfr_entry); - defrouter_rele(pfr->router); - free(pfr, M_IP6NDP); + /* + * Make sure that we do not have this address already. This should + * usually not happen, but we can still see this case, e.g., if we + * have manually configured the exact address to be configured. + */ + ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, + &ifra.ifra_addr.sin6_addr); + if (ifa != NULL) { + ifa_free(ifa); + /* this should be rare enough to make an explicit log */ + log(LOG_INFO, "in6_ifadd: %s is already configured\n", + ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr)); + return (NULL); + } + + /* + * Allocate ifaddr structure, link into chain, etc. + * If we are going to create a new address upon receiving a multicasted + * RA, we need to impose a random delay before starting DAD. + * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2] + */ + updateflags = 0; + if (mcast) + updateflags |= IN6_IFAUPDATE_DADDELAY; + if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) { + nd6log((LOG_ERR, + "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n", + ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr), + if_name(ifp), error)); + return (NULL); /* ifaddr must not have been allocated. */ + } + + ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); + /* + * XXXRW: Assumption of non-NULLness here might not be true with + * fine-grained locking -- should we validate it? Or just return + * earlier ifa rather than looking it up again? + */ + return (ia); /* this is always non-NULL and referenced. */ } static struct nd_prefix * nd6_prefix_lookup_locked(struct nd_prefixctl *key) { struct nd_prefix *search; ND6_LOCK_ASSERT(); LIST_FOREACH(search, &V_nd_prefix, ndpr_entry) { if (key->ndpr_ifp == search->ndpr_ifp && key->ndpr_plen == search->ndpr_plen && in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr, &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) { nd6_prefix_ref(search); break; } } return (search); } struct nd_prefix * nd6_prefix_lookup(struct nd_prefixctl *key) { struct nd_prefix *search; ND6_RLOCK(); search = nd6_prefix_lookup_locked(key); ND6_RUNLOCK(); return (search); } void nd6_prefix_ref(struct nd_prefix *pr) { refcount_acquire(&pr->ndpr_refcnt); } void nd6_prefix_rele(struct nd_prefix *pr) { if (refcount_release(&pr->ndpr_refcnt)) { KASSERT(LIST_EMPTY(&pr->ndpr_advrtrs), ("prefix %p has advertising routers", pr)); free(pr, M_IP6NDP); } } int nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr, struct nd_prefix **newp) { struct nd_prefix *new; char ip6buf[INET6_ADDRSTRLEN]; int error; new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO); if (new == NULL) return (ENOMEM); refcount_init(&new->ndpr_refcnt, newp != NULL ? 2 : 1); new->ndpr_ifp = pr->ndpr_ifp; new->ndpr_prefix = pr->ndpr_prefix; new->ndpr_plen = pr->ndpr_plen; new->ndpr_vltime = pr->ndpr_vltime; new->ndpr_pltime = pr->ndpr_pltime; new->ndpr_flags = pr->ndpr_flags; if ((error = in6_init_prefix_ltimes(new)) != 0) { free(new, M_IP6NDP); return (error); } new->ndpr_lastupdate = time_uptime; /* initialization */ LIST_INIT(&new->ndpr_advrtrs); in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen); /* make prefix in the canonical form */ IN6_MASK_ADDR(&new->ndpr_prefix.sin6_addr, &new->ndpr_mask); ND6_WLOCK(); LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry); V_nd6_list_genid++; ND6_WUNLOCK(); /* ND_OPT_PI_FLAG_ONLINK processing */ if (new->ndpr_raf_onlink) { struct epoch_tracker et; ND6_ONLINK_LOCK(); NET_EPOCH_ENTER(et); if ((error = nd6_prefix_onlink(new)) != 0) { nd6log((LOG_ERR, "nd6_prelist_add: failed to make " "the prefix %s/%d on-link on %s (errno=%d)\n", ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, if_name(pr->ndpr_ifp), error)); /* proceed anyway. XXX: is it correct? */ } NET_EPOCH_EXIT(et); ND6_ONLINK_UNLOCK(); } if (dr != NULL) pfxrtr_add(new, dr); if (newp != NULL) *newp = new; return (0); } /* * Remove a prefix from the prefix list and optionally stash it in a * caller-provided list. * * The ND6 lock must be held. */ void nd6_prefix_unlink(struct nd_prefix *pr, struct nd_prhead *list) { ND6_WLOCK_ASSERT(); LIST_REMOVE(pr, ndpr_entry); V_nd6_list_genid++; if (list != NULL) LIST_INSERT_HEAD(list, pr, ndpr_entry); } /* * Free an unlinked prefix, first marking it off-link if necessary. */ void nd6_prefix_del(struct nd_prefix *pr) { struct nd_pfxrouter *pfr, *next; int e; char ip6buf[INET6_ADDRSTRLEN]; KASSERT(pr->ndpr_addrcnt == 0, ("prefix %p has referencing addresses", pr)); ND6_UNLOCK_ASSERT(); /* * Though these flags are now meaningless, we'd rather keep the value * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users * when executing "ndp -p". */ if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { ND6_ONLINK_LOCK(); if ((e = nd6_prefix_offlink(pr)) != 0) { nd6log((LOG_ERR, "nd6_prefix_del: failed to make %s/%d offlink " "on %s, errno=%d\n", ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); /* what should we do? */ } ND6_ONLINK_UNLOCK(); } /* Release references to routers that have advertised this prefix. */ ND6_WLOCK(); LIST_FOREACH_SAFE(pfr, &pr->ndpr_advrtrs, pfr_entry, next) pfxrtr_del(pfr); ND6_WUNLOCK(); nd6_prefix_rele(pr); pfxlist_onlink_check(); } static int prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr, struct mbuf *m, int mcast) { struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL; struct ifaddr *ifa; struct ifnet *ifp = new->ndpr_ifp; struct nd_prefix *pr; int error = 0; int auth; struct in6_addrlifetime lt6_tmp; char ip6buf[INET6_ADDRSTRLEN]; NET_EPOCH_ASSERT(); auth = 0; if (m) { /* * Authenticity for NA consists authentication for * both IP header and IP datagrams, doesn't it ? */ #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM) auth = ((m->m_flags & M_AUTHIPHDR) && (m->m_flags & M_AUTHIPDGM)); #endif } if ((pr = nd6_prefix_lookup(new)) != NULL) { /* * nd6_prefix_lookup() ensures that pr and new have the same * prefix on a same interface. */ /* * Update prefix information. Note that the on-link (L) bit * and the autonomous (A) bit should NOT be changed from 1 * to 0. */ if (new->ndpr_raf_onlink == 1) pr->ndpr_raf_onlink = 1; if (new->ndpr_raf_auto == 1) pr->ndpr_raf_auto = 1; if (new->ndpr_raf_onlink) { pr->ndpr_vltime = new->ndpr_vltime; pr->ndpr_pltime = new->ndpr_pltime; (void)in6_init_prefix_ltimes(pr); /* XXX error case? */ pr->ndpr_lastupdate = time_uptime; } if (new->ndpr_raf_onlink && (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { ND6_ONLINK_LOCK(); if ((error = nd6_prefix_onlink(pr)) != 0) { nd6log((LOG_ERR, "prelist_update: failed to make " "the prefix %s/%d on-link on %s " "(errno=%d)\n", ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, if_name(pr->ndpr_ifp), error)); /* proceed anyway. XXX: is it correct? */ } ND6_ONLINK_UNLOCK(); } if (dr != NULL) pfxrtr_add(pr, dr); } else { if (new->ndpr_vltime == 0) goto end; if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0) goto end; error = nd6_prelist_add(new, dr, &pr); if (error != 0) { nd6log((LOG_NOTICE, "prelist_update: " "nd6_prelist_add failed for %s/%d on %s errno=%d\n", ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr), new->ndpr_plen, if_name(new->ndpr_ifp), error)); goto end; /* we should just give up in this case. */ } /* * XXX: from the ND point of view, we can ignore a prefix * with the on-link bit being zero. However, we need a * prefix structure for references from autoconfigured * addresses. Thus, we explicitly make sure that the prefix * itself expires now. */ if (pr->ndpr_raf_onlink == 0) { pr->ndpr_vltime = 0; pr->ndpr_pltime = 0; in6_init_prefix_ltimes(pr); } } /* * Address autoconfiguration based on Section 5.5.3 of RFC 2462. * Note that pr must be non NULL at this point. */ /* 5.5.3 (a). Ignore the prefix without the A bit set. */ if (!new->ndpr_raf_auto) goto end; /* * 5.5.3 (b). the link-local prefix should have been ignored in * nd6_ra_input. */ /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */ if (new->ndpr_pltime > new->ndpr_vltime) { error = EINVAL; /* XXX: won't be used */ goto end; } /* * 5.5.3 (d). If the prefix advertised is not equal to the prefix of * an address configured by stateless autoconfiguration already in the * list of addresses associated with the interface, and the Valid * Lifetime is not 0, form an address. We first check if we have * a matching prefix. * Note: we apply a clarification in rfc2462bis-02 here. We only * consider autoconfigured addresses while RFC2462 simply said * "address". */ CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { struct in6_ifaddr *ifa6; u_int32_t remaininglifetime; if (ifa->ifa_addr->sa_family != AF_INET6) continue; ifa6 = (struct in6_ifaddr *)ifa; /* * We only consider autoconfigured addresses as per rfc2462bis. */ if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF)) continue; /* * Spec is not clear here, but I believe we should concentrate * on unicast (i.e. not anycast) addresses. * XXX: other ia6_flags? detached or duplicated? */ if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0) continue; /* * Ignore the address if it is not associated with a prefix * or is associated with a prefix that is different from this * one. (pr is never NULL here) */ if (ifa6->ia6_ndpr != pr) continue; if (ia6_match == NULL) /* remember the first one */ ia6_match = ifa6; /* * An already autoconfigured address matched. Now that we * are sure there is at least one matched address, we can * proceed to 5.5.3. (e): update the lifetimes according to the * "two hours" rule and the privacy extension. * We apply some clarifications in rfc2462bis: * - use remaininglifetime instead of storedlifetime as a * variable name * - remove the dead code in the "two-hour" rule */ #define TWOHOUR (120*60) lt6_tmp = ifa6->ia6_lifetime; if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME) remaininglifetime = ND6_INFINITE_LIFETIME; else if (time_uptime - ifa6->ia6_updatetime > lt6_tmp.ia6t_vltime) { /* * The case of "invalid" address. We should usually * not see this case. */ remaininglifetime = 0; } else remaininglifetime = lt6_tmp.ia6t_vltime - (time_uptime - ifa6->ia6_updatetime); /* when not updating, keep the current stored lifetime. */ lt6_tmp.ia6t_vltime = remaininglifetime; if (TWOHOUR < new->ndpr_vltime || remaininglifetime < new->ndpr_vltime) { lt6_tmp.ia6t_vltime = new->ndpr_vltime; } else if (remaininglifetime <= TWOHOUR) { if (auth) { lt6_tmp.ia6t_vltime = new->ndpr_vltime; } } else { /* * new->ndpr_vltime <= TWOHOUR && * TWOHOUR < remaininglifetime */ lt6_tmp.ia6t_vltime = TWOHOUR; } /* The 2 hour rule is not imposed for preferred lifetime. */ lt6_tmp.ia6t_pltime = new->ndpr_pltime; in6_init_address_ltimes(pr, <6_tmp); /* * We need to treat lifetimes for temporary addresses * differently, according to * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1); * we only update the lifetimes when they are in the maximum * intervals. */ if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) { u_int32_t maxvltime, maxpltime; if (V_ip6_temp_valid_lifetime > (u_int32_t)((time_uptime - ifa6->ia6_createtime) + V_ip6_desync_factor)) { maxvltime = V_ip6_temp_valid_lifetime - (time_uptime - ifa6->ia6_createtime) - V_ip6_desync_factor; } else maxvltime = 0; if (V_ip6_temp_preferred_lifetime > (u_int32_t)((time_uptime - ifa6->ia6_createtime) + V_ip6_desync_factor)) { maxpltime = V_ip6_temp_preferred_lifetime - (time_uptime - ifa6->ia6_createtime) - V_ip6_desync_factor; } else maxpltime = 0; if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME || lt6_tmp.ia6t_vltime > maxvltime) { lt6_tmp.ia6t_vltime = maxvltime; } if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME || lt6_tmp.ia6t_pltime > maxpltime) { lt6_tmp.ia6t_pltime = maxpltime; } } ifa6->ia6_lifetime = lt6_tmp; ifa6->ia6_updatetime = time_uptime; } if (ia6_match == NULL && new->ndpr_vltime) { int ifidlen; /* * 5.5.3 (d) (continued) * No address matched and the valid lifetime is non-zero. * Create a new address. */ /* * Prefix Length check: * If the sum of the prefix length and interface identifier * length does not equal 128 bits, the Prefix Information * option MUST be ignored. The length of the interface * identifier is defined in a separate link-type specific * document. */ ifidlen = in6_if2idlen(ifp); if (ifidlen < 0) { /* this should not happen, so we always log it. */ log(LOG_ERR, "prelist_update: IFID undefined (%s)\n", if_name(ifp)); goto end; } if (ifidlen + pr->ndpr_plen != 128) { nd6log((LOG_INFO, "prelist_update: invalid prefixlen " "%d for %s, ignored\n", pr->ndpr_plen, if_name(ifp))); goto end; } if ((ia6 = in6_ifadd(new, mcast)) != NULL) { /* * note that we should use pr (not new) for reference. */ pr->ndpr_addrcnt++; ia6->ia6_ndpr = pr; /* * RFC 3041 3.3 (2). * When a new public address is created as described * in RFC2462, also create a new temporary address. * * RFC 3041 3.5. * When an interface connects to a new link, a new * randomized interface identifier should be generated * immediately together with a new set of temporary * addresses. Thus, we specifiy 1 as the 2nd arg of * in6_tmpifadd(). */ if (V_ip6_use_tempaddr) { int e; if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) { nd6log((LOG_NOTICE, "prelist_update: " "failed to create a temporary " "address, errno=%d\n", e)); } } ifa_free(&ia6->ia_ifa); /* * A newly added address might affect the status * of other addresses, so we check and update it. * XXX: what if address duplication happens? */ pfxlist_onlink_check(); } else { /* just set an error. do not bark here. */ error = EADDRNOTAVAIL; /* XXX: might be unused. */ } } end: if (pr != NULL) nd6_prefix_rele(pr); return (error); } /* * A supplement function used in the on-link detection below; * detect if a given prefix has a (probably) reachable advertising router. * XXX: lengthy function name... */ static struct nd_pfxrouter * find_pfxlist_reachable_router(struct nd_prefix *pr) { struct epoch_tracker et; struct nd_pfxrouter *pfxrtr; struct llentry *ln; int canreach; ND6_LOCK_ASSERT(); NET_EPOCH_ENTER(et); LIST_FOREACH(pfxrtr, &pr->ndpr_advrtrs, pfr_entry) { ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp); if (ln == NULL) continue; canreach = ND6_IS_LLINFO_PROBREACH(ln); LLE_RUNLOCK(ln); if (canreach) break; } NET_EPOCH_EXIT(et); return (pfxrtr); } /* * Check if each prefix in the prefix list has at least one available router * that advertised the prefix (a router is "available" if its neighbor cache * entry is reachable or probably reachable). * If the check fails, the prefix may be off-link, because, for example, * we have moved from the network but the lifetime of the prefix has not * expired yet. So we should not use the prefix if there is another prefix * that has an available router. * But, if there is no prefix that has an available router, we still regard * all the prefixes as on-link. This is because we can't tell if all the * routers are simply dead or if we really moved from the network and there * is no router around us. */ void pfxlist_onlink_check(void) { struct nd_prefix *pr; struct in6_ifaddr *ifa; struct nd_defrouter *dr; struct nd_pfxrouter *pfxrtr = NULL; struct rm_priotracker in6_ifa_tracker; uint64_t genid; uint32_t flags; ND6_ONLINK_LOCK(); ND6_RLOCK(); /* * Check if there is a prefix that has a reachable advertising * router. */ LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr)) break; } /* * If we have no such prefix, check whether we still have a router * that does not advertise any prefixes. */ if (pr == NULL) { TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) { struct nd_prefix *pr0; LIST_FOREACH(pr0, &V_nd_prefix, ndpr_entry) { if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL) break; } if (pfxrtr != NULL) break; } } if (pr != NULL || (!TAILQ_EMPTY(&V_nd6_defrouter) && pfxrtr == NULL)) { /* * There is at least one prefix that has a reachable router, * or at least a router which probably does not advertise * any prefixes. The latter would be the case when we move * to a new link where we have a router that does not provide * prefixes and we configure an address by hand. * Detach prefixes which have no reachable advertising * router, and attach other prefixes. */ LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { /* XXX: a link-local prefix should never be detached */ if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) || pr->ndpr_raf_onlink == 0 || pr->ndpr_raf_auto == 0) continue; if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && find_pfxlist_reachable_router(pr) == NULL) pr->ndpr_stateflags |= NDPRF_DETACHED; else if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && find_pfxlist_reachable_router(pr) != NULL) pr->ndpr_stateflags &= ~NDPRF_DETACHED; } } else { /* there is no prefix that has a reachable router */ LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) || pr->ndpr_raf_onlink == 0 || pr->ndpr_raf_auto == 0) continue; pr->ndpr_stateflags &= ~NDPRF_DETACHED; } } /* * Remove each interface route associated with a (just) detached * prefix, and reinstall the interface route for a (just) attached * prefix. Note that all attempt of reinstallation does not * necessarily success, when a same prefix is shared among multiple * interfaces. Such cases will be handled in nd6_prefix_onlink, * so we don't have to care about them. */ restart: LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { char ip6buf[INET6_ADDRSTRLEN]; int e; if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) || pr->ndpr_raf_onlink == 0 || pr->ndpr_raf_auto == 0) continue; flags = pr->ndpr_stateflags & (NDPRF_DETACHED | NDPRF_ONLINK); if (flags == 0 || flags == (NDPRF_DETACHED | NDPRF_ONLINK)) { genid = V_nd6_list_genid; ND6_RUNLOCK(); if ((flags & NDPRF_ONLINK) != 0 && (e = nd6_prefix_offlink(pr)) != 0) { nd6log((LOG_ERR, "pfxlist_onlink_check: failed to " "make %s/%d offlink, errno=%d\n", ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, e)); } else if ((flags & NDPRF_ONLINK) == 0 && (e = nd6_prefix_onlink(pr)) != 0) { nd6log((LOG_ERR, "pfxlist_onlink_check: failed to " "make %s/%d onlink, errno=%d\n", ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, e)); } ND6_RLOCK(); if (genid != V_nd6_list_genid) goto restart; } } /* * Changes on the prefix status might affect address status as well. * Make sure that all addresses derived from an attached prefix are * attached, and that all addresses derived from a detached prefix are * detached. Note, however, that a manually configured address should * always be attached. * The precise detection logic is same as the one for prefixes. */ IN6_IFADDR_RLOCK(&in6_ifa_tracker); CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) { if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF)) continue; if (ifa->ia6_ndpr == NULL) { /* * This can happen when we first configure the address * (i.e. the address exists, but the prefix does not). * XXX: complicated relationships... */ continue; } if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) break; } if (ifa) { CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) { if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) continue; if (ifa->ia6_ndpr == NULL) /* XXX: see above. */ continue; if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) { if (ifa->ia6_flags & IN6_IFF_DETACHED) { ifa->ia6_flags &= ~IN6_IFF_DETACHED; ifa->ia6_flags |= IN6_IFF_TENTATIVE; nd6_dad_start((struct ifaddr *)ifa, 0); } } else { ifa->ia6_flags |= IN6_IFF_DETACHED; } } } else { CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) { if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) continue; if (ifa->ia6_flags & IN6_IFF_DETACHED) { ifa->ia6_flags &= ~IN6_IFF_DETACHED; ifa->ia6_flags |= IN6_IFF_TENTATIVE; /* Do we need a delay in this case? */ nd6_dad_start((struct ifaddr *)ifa, 0); } } } IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); ND6_RUNLOCK(); ND6_ONLINK_UNLOCK(); } static int nd6_prefix_onlink_rtrequest(struct nd_prefix *pr, struct ifaddr *ifa) { struct sockaddr_dl sdl; struct rtentry *rt; struct sockaddr_in6 mask6; u_long rtflags; int error, a_failure, fibnum, maxfib; /* * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs. * ifa->ifa_rtrequest = nd6_rtrequest; */ bzero(&mask6, sizeof(mask6)); mask6.sin6_len = sizeof(mask6); mask6.sin6_addr = pr->ndpr_mask; rtflags = (ifa->ifa_flags & ~IFA_RTSELF) | RTF_UP; bzero(&sdl, sizeof(struct sockaddr_dl)); sdl.sdl_len = sizeof(struct sockaddr_dl); sdl.sdl_family = AF_LINK; sdl.sdl_type = ifa->ifa_ifp->if_type; sdl.sdl_index = ifa->ifa_ifp->if_index; if(V_rt_add_addr_allfibs) { fibnum = 0; maxfib = rt_numfibs; } else { fibnum = ifa->ifa_ifp->if_fib; maxfib = fibnum + 1; } a_failure = 0; for (; fibnum < maxfib; fibnum++) { rt = NULL; error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix, (struct sockaddr *)&sdl, (struct sockaddr *)&mask6, rtflags, &rt, fibnum); if (error == 0) { KASSERT(rt != NULL, ("%s: in6_rtrequest return no " "error(%d) but rt is NULL, pr=%p, ifa=%p", __func__, error, pr, ifa)); RT_LOCK(rt); nd6_rtmsg(RTM_ADD, rt); RT_UNLOCK(rt); pr->ndpr_stateflags |= NDPRF_ONLINK; } else { char ip6buf[INET6_ADDRSTRLEN]; char ip6bufg[INET6_ADDRSTRLEN]; char ip6bufm[INET6_ADDRSTRLEN]; struct sockaddr_in6 *sin6; sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add " "route for a prefix (%s/%d) on %s, gw=%s, mask=%s, " "flags=%lx errno = %d\n", ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, if_name(pr->ndpr_ifp), ip6_sprintf(ip6bufg, &sin6->sin6_addr), ip6_sprintf(ip6bufm, &mask6.sin6_addr), rtflags, error)); /* Save last error to return, see rtinit(). */ a_failure = error; } if (rt != NULL) { RT_LOCK(rt); RT_REMREF(rt); RT_UNLOCK(rt); } } /* Return the last error we got. */ return (a_failure); } int nd6_prefix_onlink(struct nd_prefix *pr) { struct epoch_tracker et; struct ifaddr *ifa; struct ifnet *ifp = pr->ndpr_ifp; struct nd_prefix *opr; char ip6buf[INET6_ADDRSTRLEN]; int error; ND6_ONLINK_LOCK_ASSERT(); ND6_UNLOCK_ASSERT(); if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) return (EEXIST); /* * Add the interface route associated with the prefix. Before * installing the route, check if there's the same prefix on another * interface, and the prefix has already installed the interface route. * Although such a configuration is expected to be rare, we explicitly * allow it. */ ND6_RLOCK(); LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) { if (opr == pr) continue; if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0) continue; if (!V_rt_add_addr_allfibs && opr->ndpr_ifp->if_fib != pr->ndpr_ifp->if_fib) continue; if (opr->ndpr_plen == pr->ndpr_plen && in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) { ND6_RUNLOCK(); return (0); } } ND6_RUNLOCK(); /* * We prefer link-local addresses as the associated interface address. */ /* search for a link-local addr */ NET_EPOCH_ENTER(et); ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY | IN6_IFF_ANYCAST); if (ifa == NULL) { /* XXX: freebsd does not have ifa_ifwithaf */ CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { if (ifa->ifa_addr->sa_family == AF_INET6) { ifa_ref(ifa); break; } } /* should we care about ia6_flags? */ } NET_EPOCH_EXIT(et); if (ifa == NULL) { /* * This can still happen, when, for example, we receive an RA * containing a prefix with the L bit set and the A bit clear, * after removing all IPv6 addresses on the receiving * interface. This should, of course, be rare though. */ nd6log((LOG_NOTICE, "nd6_prefix_onlink: failed to find any ifaddr" " to add route for a prefix(%s/%d) on %s\n", ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, if_name(ifp))); return (0); } error = nd6_prefix_onlink_rtrequest(pr, ifa); if (ifa != NULL) ifa_free(ifa); return (error); } int nd6_prefix_offlink(struct nd_prefix *pr) { int error = 0; struct ifnet *ifp = pr->ndpr_ifp; struct nd_prefix *opr; struct sockaddr_in6 sa6, mask6; struct rtentry *rt; char ip6buf[INET6_ADDRSTRLEN]; uint64_t genid; int fibnum, maxfib, a_failure; ND6_ONLINK_LOCK_ASSERT(); ND6_UNLOCK_ASSERT(); if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) return (EEXIST); bzero(&sa6, sizeof(sa6)); sa6.sin6_family = AF_INET6; sa6.sin6_len = sizeof(sa6); bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr, sizeof(struct in6_addr)); bzero(&mask6, sizeof(mask6)); mask6.sin6_family = AF_INET6; mask6.sin6_len = sizeof(sa6); bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr)); if (V_rt_add_addr_allfibs) { fibnum = 0; maxfib = rt_numfibs; } else { fibnum = ifp->if_fib; maxfib = fibnum + 1; } a_failure = 0; for (; fibnum < maxfib; fibnum++) { rt = NULL; error = in6_rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL, (struct sockaddr *)&mask6, 0, &rt, fibnum); if (error == 0) { /* report the route deletion to the routing socket. */ if (rt != NULL) nd6_rtmsg(RTM_DELETE, rt); } else { /* Save last error to return, see rtinit(). */ a_failure = error; } if (rt != NULL) { RTFREE(rt); } } error = a_failure; a_failure = 1; if (error == 0) { pr->ndpr_stateflags &= ~NDPRF_ONLINK; /* * There might be the same prefix on another interface, * the prefix which could not be on-link just because we have * the interface route (see comments in nd6_prefix_onlink). * If there's one, try to make the prefix on-link on the * interface. */ ND6_RLOCK(); restart: LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) { /* * KAME specific: detached prefixes should not be * on-link. */ if (opr == pr || (opr->ndpr_stateflags & (NDPRF_ONLINK | NDPRF_DETACHED)) != 0) continue; if (opr->ndpr_plen == pr->ndpr_plen && in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) { int e; genid = V_nd6_list_genid; ND6_RUNLOCK(); if ((e = nd6_prefix_onlink(opr)) != 0) { nd6log((LOG_ERR, "nd6_prefix_offlink: failed to " "recover a prefix %s/%d from %s " "to %s (errno = %d)\n", ip6_sprintf(ip6buf, &opr->ndpr_prefix.sin6_addr), opr->ndpr_plen, if_name(ifp), if_name(opr->ndpr_ifp), e)); } else a_failure = 0; ND6_RLOCK(); if (genid != V_nd6_list_genid) goto restart; } } ND6_RUNLOCK(); } else { /* XXX: can we still set the NDPRF_ONLINK flag? */ nd6log((LOG_ERR, "nd6_prefix_offlink: failed to delete route: " "%s/%d on %s (errno = %d)\n", ip6_sprintf(ip6buf, &sa6.sin6_addr), pr->ndpr_plen, if_name(ifp), error)); } if (a_failure) lltable_prefix_free(AF_INET6, (struct sockaddr *)&sa6, (struct sockaddr *)&mask6, LLE_STATIC); return (error); } -static struct in6_ifaddr * -in6_ifadd(struct nd_prefixctl *pr, int mcast) -{ - struct ifnet *ifp = pr->ndpr_ifp; - struct ifaddr *ifa; - struct in6_aliasreq ifra; - struct in6_ifaddr *ia, *ib; - int error, plen0; - struct in6_addr mask; - int prefixlen = pr->ndpr_plen; - int updateflags; - char ip6buf[INET6_ADDRSTRLEN]; - - in6_prefixlen2mask(&mask, prefixlen); - - /* - * find a link-local address (will be interface ID). - * Is it really mandatory? Theoretically, a global or a site-local - * address can be configured without a link-local address, if we - * have a unique interface identifier... - * - * it is not mandatory to have a link-local address, we can generate - * interface identifier on the fly. we do this because: - * (1) it should be the easiest way to find interface identifier. - * (2) RFC2462 5.4 suggesting the use of the same interface identifier - * for multiple addresses on a single interface, and possible shortcut - * of DAD. we omitted DAD for this reason in the past. - * (3) a user can prevent autoconfiguration of global address - * by removing link-local address by hand (this is partly because we - * don't have other way to control the use of IPv6 on an interface. - * this has been our design choice - cf. NRL's "ifconfig auto"). - * (4) it is easier to manage when an interface has addresses - * with the same interface identifier, than to have multiple addresses - * with different interface identifiers. - */ - ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */ - if (ifa) - ib = (struct in6_ifaddr *)ifa; - else - return NULL; - - /* prefixlen + ifidlen must be equal to 128 */ - plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL); - if (prefixlen != plen0) { - ifa_free(ifa); - nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s " - "(prefix=%d ifid=%d)\n", - if_name(ifp), prefixlen, 128 - plen0)); - return NULL; - } - - /* make ifaddr */ - in6_prepare_ifra(&ifra, &pr->ndpr_prefix.sin6_addr, &mask); - - IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr, &mask); - /* interface ID */ - ifra.ifra_addr.sin6_addr.s6_addr32[0] |= - (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]); - ifra.ifra_addr.sin6_addr.s6_addr32[1] |= - (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]); - ifra.ifra_addr.sin6_addr.s6_addr32[2] |= - (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]); - ifra.ifra_addr.sin6_addr.s6_addr32[3] |= - (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]); - ifa_free(ifa); - - /* lifetimes. */ - ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime; - ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime; - - /* XXX: scope zone ID? */ - - ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */ - - /* - * Make sure that we do not have this address already. This should - * usually not happen, but we can still see this case, e.g., if we - * have manually configured the exact address to be configured. - */ - ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, - &ifra.ifra_addr.sin6_addr); - if (ifa != NULL) { - ifa_free(ifa); - /* this should be rare enough to make an explicit log */ - log(LOG_INFO, "in6_ifadd: %s is already configured\n", - ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr)); - return (NULL); - } - - /* - * Allocate ifaddr structure, link into chain, etc. - * If we are going to create a new address upon receiving a multicasted - * RA, we need to impose a random delay before starting DAD. - * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2] - */ - updateflags = 0; - if (mcast) - updateflags |= IN6_IFAUPDATE_DADDELAY; - if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) { - nd6log((LOG_ERR, - "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n", - ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr), - if_name(ifp), error)); - return (NULL); /* ifaddr must not have been allocated. */ - } - - ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); - /* - * XXXRW: Assumption of non-NULLness here might not be true with - * fine-grained locking -- should we validate it? Or just return - * earlier ifa rather than looking it up again? - */ - return (ia); /* this is always non-NULL and referenced. */ -} - /* * ia0 - corresponding public address */ int in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay) { struct ifnet *ifp = ia0->ia_ifa.ifa_ifp; struct in6_ifaddr *newia; struct in6_aliasreq ifra; int error; int trylimit = 3; /* XXX: adhoc value */ int updateflags; u_int32_t randid[2]; time_t vltime0, pltime0; in6_prepare_ifra(&ifra, &ia0->ia_addr.sin6_addr, &ia0->ia_prefixmask.sin6_addr); ifra.ifra_addr = ia0->ia_addr; /* XXX: do we need this ? */ /* clear the old IFID */ IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr, &ifra.ifra_prefixmask.sin6_addr); again: if (in6_get_tmpifid(ifp, (u_int8_t *)randid, (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) { nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find a good " "random IFID\n")); return (EINVAL); } ifra.ifra_addr.sin6_addr.s6_addr32[2] |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2])); ifra.ifra_addr.sin6_addr.s6_addr32[3] |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3])); /* * in6_get_tmpifid() quite likely provided a unique interface ID. * However, we may still have a chance to see collision, because * there may be a time lag between generation of the ID and generation * of the address. So, we'll do one more sanity check. */ if (in6_localip(&ifra.ifra_addr.sin6_addr) != 0) { if (trylimit-- > 0) { forcegen = 1; goto again; } /* Give up. Something strange should have happened. */ nd6log((LOG_NOTICE, "in6_tmpifadd: failed to " "find a unique random IFID\n")); return (EEXIST); } /* * The Valid Lifetime is the lower of the Valid Lifetime of the * public address or TEMP_VALID_LIFETIME. * The Preferred Lifetime is the lower of the Preferred Lifetime * of the public address or TEMP_PREFERRED_LIFETIME - * DESYNC_FACTOR. */ if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { vltime0 = IFA6_IS_INVALID(ia0) ? 0 : (ia0->ia6_lifetime.ia6t_vltime - (time_uptime - ia0->ia6_updatetime)); if (vltime0 > V_ip6_temp_valid_lifetime) vltime0 = V_ip6_temp_valid_lifetime; } else vltime0 = V_ip6_temp_valid_lifetime; if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 : (ia0->ia6_lifetime.ia6t_pltime - (time_uptime - ia0->ia6_updatetime)); if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){ pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor; } } else pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor; ifra.ifra_lifetime.ia6t_vltime = vltime0; ifra.ifra_lifetime.ia6t_pltime = pltime0; /* * A temporary address is created only if this calculated Preferred * Lifetime is greater than REGEN_ADVANCE time units. */ if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance) return (0); /* XXX: scope zone ID? */ ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY); /* allocate ifaddr structure, link into chain, etc. */ updateflags = 0; if (delay) updateflags |= IN6_IFAUPDATE_DADDELAY; if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) return (error); newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); if (newia == NULL) { /* XXX: can it happen? */ nd6log((LOG_ERR, "in6_tmpifadd: ifa update succeeded, but we got " "no ifaddr\n")); return (EINVAL); /* XXX */ } newia->ia6_ndpr = ia0->ia6_ndpr; newia->ia6_ndpr->ndpr_addrcnt++; ifa_free(&newia->ia_ifa); /* * A newly added address might affect the status of other addresses. * XXX: when the temporary address is generated with a new public * address, the onlink check is redundant. However, it would be safe * to do the check explicitly everywhere a new address is generated, * and, in fact, we surely need the check when we create a new * temporary address due to deprecation of an old temporary address. */ pfxlist_onlink_check(); return (0); } static int -in6_init_prefix_ltimes(struct nd_prefix *ndpr) -{ - if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) - ndpr->ndpr_preferred = 0; - else - ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime; - if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) - ndpr->ndpr_expire = 0; - else - ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime; - - return 0; -} - -static void -in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6) -{ - /* init ia6t_expire */ - if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) - lt6->ia6t_expire = 0; - else { - lt6->ia6t_expire = time_uptime; - lt6->ia6t_expire += lt6->ia6t_vltime; - } - - /* init ia6t_preferred */ - if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) - lt6->ia6t_preferred = 0; - else { - lt6->ia6t_preferred = time_uptime; - lt6->ia6t_preferred += lt6->ia6t_pltime; - } -} - -/* - * Delete all the routing table entries that use the specified gateway. - * XXX: this function causes search through all entries of routing table, so - * it shouldn't be called when acting as a router. - */ -void -rt6_flush(struct in6_addr *gateway, struct ifnet *ifp) -{ - - /* We'll care only link-local addresses */ - if (!IN6_IS_ADDR_LINKLOCAL(gateway)) - return; - - /* XXX Do we really need to walk any but the default FIB? */ - rt_foreach_fib_walk_del(AF_INET6, rt6_deleteroute, (void *)gateway); -} - -static int rt6_deleteroute(const struct rtentry *rt, void *arg) { #define SIN6(s) ((struct sockaddr_in6 *)s) struct in6_addr *gate = (struct in6_addr *)arg; if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6) return (0); if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) { return (0); } /* * Do not delete a static route. * XXX: this seems to be a bit ad-hoc. Should we consider the * 'cloned' bit instead? */ if ((rt->rt_flags & RTF_STATIC) != 0) return (0); /* * We delete only host route. This means, in particular, we don't * delete default route. */ if ((rt->rt_flags & RTF_HOST) == 0) return (0); return (1); #undef SIN6 } +/* + * Delete all the routing table entries that use the specified gateway. + * XXX: this function causes search through all entries of routing table, so + * it shouldn't be called when acting as a router. + */ +void +rt6_flush(struct in6_addr *gateway, struct ifnet *ifp) +{ + + /* We'll care only link-local addresses */ + if (!IN6_IS_ADDR_LINKLOCAL(gateway)) + return; + + /* XXX Do we really need to walk any but the default FIB? */ + rt_foreach_fib_walk_del(AF_INET6, rt6_deleteroute, (void *)gateway); +} + int nd6_setdefaultiface(int ifindex) { int error = 0; if (ifindex < 0 || V_if_index < ifindex) return (EINVAL); if (ifindex != 0 && !ifnet_byindex(ifindex)) return (EINVAL); if (V_nd6_defifindex != ifindex) { V_nd6_defifindex = ifindex; if (V_nd6_defifindex > 0) V_nd6_defifp = ifnet_byindex(V_nd6_defifindex); else V_nd6_defifp = NULL; /* * Our current implementation assumes one-to-one maping between * interfaces and links, so it would be natural to use the * default interface as the default link. */ scope6_setdefault(V_nd6_defifp); } return (error); } -static int -nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS) -{ - struct in6_defrouter d; - struct nd_defrouter *dr; - int error; - - if (req->newptr != NULL) - return (EPERM); - - error = sysctl_wire_old_buffer(req, 0); - if (error != 0) - return (error); - - bzero(&d, sizeof(d)); - d.rtaddr.sin6_family = AF_INET6; - d.rtaddr.sin6_len = sizeof(d.rtaddr); - - ND6_RLOCK(); - TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) { - d.rtaddr.sin6_addr = dr->rtaddr; - error = sa6_recoverscope(&d.rtaddr); - if (error != 0) - break; - d.flags = dr->raflags; - d.rtlifetime = dr->rtlifetime; - d.expire = dr->expire + (time_second - time_uptime); - d.if_index = dr->ifp->if_index; - error = SYSCTL_OUT(req, &d, sizeof(d)); - if (error != 0) - break; - } - ND6_RUNLOCK(); - return (error); -} -SYSCTL_DECL(_net_inet6_icmp6); -SYSCTL_PROC(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist, - CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, - NULL, 0, nd6_sysctl_drlist, "S,in6_defrouter", - "NDP default router list"); - bool nd6_defrouter_list_empty(void) { return (TAILQ_EMPTY(&V_nd6_defrouter)); } void nd6_defrouter_timer(void) { struct nd_defrouter *dr, *ndr; struct nd6_drhead drq; TAILQ_INIT(&drq); ND6_WLOCK(); TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr) if (dr->expire && dr->expire < time_uptime) defrouter_unlink(dr, &drq); ND6_WUNLOCK(); while ((dr = TAILQ_FIRST(&drq)) != NULL) { TAILQ_REMOVE(&drq, dr, dr_entry); defrouter_del(dr); } } /* * Nuke default router list entries toward ifp. * We defer removal of default router list entries that is installed in the * routing table, in order to keep additional side effects as small as possible. */ void nd6_defrouter_purge(struct ifnet *ifp) { struct nd_defrouter *dr, *ndr; struct nd6_drhead drq; TAILQ_INIT(&drq); ND6_WLOCK(); TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr) { if (dr->installed) continue; if (dr->ifp == ifp) defrouter_unlink(dr, &drq); } TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr) { if (!dr->installed) continue; if (dr->ifp == ifp) defrouter_unlink(dr, &drq); } ND6_WUNLOCK(); /* Delete the unlinked router objects. */ while ((dr = TAILQ_FIRST(&drq)) != NULL) { TAILQ_REMOVE(&drq, dr, dr_entry); defrouter_del(dr); } } void nd6_defrouter_flush_all(void) { struct nd_defrouter *dr; struct nd6_drhead drq; TAILQ_INIT(&drq); ND6_WLOCK(); while ((dr = TAILQ_FIRST(&V_nd6_defrouter)) != NULL) defrouter_unlink(dr, &drq); ND6_WUNLOCK(); while ((dr = TAILQ_FIRST(&drq)) != NULL) { TAILQ_REMOVE(&drq, dr, dr_entry); defrouter_del(dr); } } void nd6_defrouter_init(void) { TAILQ_INIT(&V_nd6_defrouter); } + +static int +nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS) +{ + struct in6_defrouter d; + struct nd_defrouter *dr; + int error; + + if (req->newptr != NULL) + return (EPERM); + + error = sysctl_wire_old_buffer(req, 0); + if (error != 0) + return (error); + + bzero(&d, sizeof(d)); + d.rtaddr.sin6_family = AF_INET6; + d.rtaddr.sin6_len = sizeof(d.rtaddr); + + ND6_RLOCK(); + TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) { + d.rtaddr.sin6_addr = dr->rtaddr; + error = sa6_recoverscope(&d.rtaddr); + if (error != 0) + break; + d.flags = dr->raflags; + d.rtlifetime = dr->rtlifetime; + d.expire = dr->expire + (time_second - time_uptime); + d.if_index = dr->ifp->if_index; + error = SYSCTL_OUT(req, &d, sizeof(d)); + if (error != 0) + break; + } + ND6_RUNLOCK(); + return (error); +} +SYSCTL_PROC(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist, + CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, + NULL, 0, nd6_sysctl_drlist, "S,in6_defrouter", + "NDP default router list");