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- /*-
- * 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 <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #include "opt_inet.h"
- #include "opt_inet6.h"
- #include <sys/param.h>
- #include <sys/systm.h>
- #include <sys/malloc.h>
- #include <sys/mbuf.h>
- #include <sys/refcount.h>
- #include <sys/socket.h>
- #include <sys/sockio.h>
- #include <sys/time.h>
- #include <sys/kernel.h>
- #include <sys/lock.h>
- #include <sys/errno.h>
- #include <sys/rmlock.h>
- #include <sys/rwlock.h>
- #include <sys/sysctl.h>
- #include <sys/syslog.h>
- #include <sys/queue.h>
- #include <net/if.h>
- #include <net/if_var.h>
- #include <net/if_types.h>
- #include <net/if_dl.h>
- #include <net/route.h>
- #include <net/route/nhop.h>
- #include <net/route/route_ctl.h>
- #include <net/route/route_var.h>
- #include <net/radix.h>
- #include <net/vnet.h>
- #include <netinet/in.h>
- #include <net/if_llatbl.h>
- #include <netinet6/in6_var.h>
- #include <netinet6/in6_ifattach.h>
- #include <netinet/ip6.h>
- #include <netinet6/ip6_var.h>
- #include <netinet6/nd6.h>
- #include <netinet/icmp6.h>
- #include <netinet6/scope6_var.h>
- static struct nd_defrouter *defrtrlist_update(struct nd_defrouter *);
- static int prelist_update(struct nd_prefixctl *, struct nd_defrouter *,
- struct mbuf *, int);
- static int nd6_prefix_onlink(struct nd_prefix *);
- 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 (__predict_false(ip6->ip6_hlim != 255)) {
- ICMP6STAT_INC(icp6s_invlhlim);
- nd6log((LOG_ERR,
- "%s: invalid hlim (%d) from %s to %s on %s\n", __func__,
- 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;
- if (m->m_len < off + icmp6len) {
- 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,
- "%s: invalid ND option, ignored\n", __func__));
- /* 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,
- "%s: lladdrlen mismatch for %s (if %d, RS packet %d)\n",
- __func__, 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 (__predict_false(ip6->ip6_hlim != 255)) {
- ICMP6STAT_INC(icp6s_invlhlim);
- nd6log((LOG_ERR,
- "%s: invalid hlim (%d) from %s to %s on %s\n", __func__,
- 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,
- "%s: src %s is not link-local\n", __func__,
- ip6_sprintf(ip6bufs, &saddr6)));
- goto bad;
- }
- if (m->m_len < off + icmp6len) {
- 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,
- "%s: invalid ND option, ignored\n", __func__));
- /* 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,
- "%s: invalid option len %d for prefix "
- "information option, ignored\n", __func__,
- pi->nd_opt_pi_len));
- continue;
- }
- if (128 < pi->nd_opt_pi_prefix_len) {
- nd6log((LOG_INFO,
- "%s: invalid prefix len %d for prefix "
- "information option, ignored\n", __func__,
- 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,
- "%s: invalid prefix %s, ignored\n",
- __func__, 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, "%s: bogus mtu option mtu=%lu sent "
- "from %s, ignoring\n", __func__,
- 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, "%s: bogus mtu=%lu sent from %s; "
- "exceeds maxmtu %lu, ignoring\n", __func__,
- 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,
- "%s: lladdrlen mismatch for %s (if %d, RA packet %d)\n",
- __func__, 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);
- }
- /* 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 rt_addrinfo info;
- struct rib_cmd_info rc;
- unsigned int fibnum;
- 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;
- fibnum = new->ifp->if_fib;
- bzero((caddr_t)&info, sizeof(info));
- info.rti_flags = RTF_GATEWAY;
- info.rti_info[RTAX_DST] = (struct sockaddr *)&def;
- info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&gate;
- info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&mask;
- NET_EPOCH_ASSERT();
- error = rib_action(fibnum, RTM_ADD, &info, &rc);
- if (rc.rc_rt != NULL) {
- struct nhop_object *nh = nhop_select(rc.rc_nh_new, 0);
- rt_routemsg(RTM_ADD, rc.rc_rt, nh, fibnum);
- }
- if (error == 0)
- new->installed = 1;
- }
- /*
- * 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 rt_addrinfo info;
- struct rib_cmd_info rc;
- struct epoch_tracker et;
- unsigned int fibnum;
- 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;
- fibnum = dr->ifp->if_fib;
- bzero((caddr_t)&info, sizeof(info));
- info.rti_flags = RTF_GATEWAY;
- info.rti_info[RTAX_DST] = (struct sockaddr *)&def;
- info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&gate;
- info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&mask;
- NET_EPOCH_ENTER(et);
- rib_action(fibnum, RTM_DELETE, &info, &rc);
- if (rc.rc_rt != NULL) {
- struct nhop_object *nh = nhop_select(rc.rc_nh_old, 0);
- rt_routemsg(RTM_DELETE, rc.rc_rt, nh, fibnum);
- }
- NET_EPOCH_EXIT(et);
- dr->installed = 0;
- }
- 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(const 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(const 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();
- NET_EPOCH_ENTER(et);
- /*
- * 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);
- NET_EPOCH_EXIT(et);
- }
- 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 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;
- }
- }
- 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,
- "%s: wrong prefixlen for %s (prefix=%d ifid=%d)\n",
- __func__, 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,
- "%s: failed to make ifaddr %s on %s (errno=%d)\n", __func__,
- 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, "%s: failed to make the prefix %s/%d "
- "on-link on %s (errno=%d)\n", __func__,
- 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,
- "%s: failed to make the prefix %s/%d offlink on %s "
- "(errno=%d)\n", __func__,
- 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,
- "%s: failed to make the prefix %s/%d "
- "on-link on %s (errno=%d)\n", __func__,
- 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, "%s: nd6_prelist_add() failed for "
- "the prefix %s/%d on %s (errno=%d)\n", __func__,
- 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,
- "%s: invalid prefixlen %d for %s, ignored\n",
- __func__, 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, "%s: failed to "
- "create a temporary address "
- "(errno=%d)\n", __func__, 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,
- "%s: failed to make %s/%d offlink "
- "(errno=%d)\n", __func__,
- 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,
- "%s: failed to make %s/%d onlink "
- "(errno=%d)\n", __func__,
- 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();
- }
- /*
- * Add or remove interface route specified by @dst, @netmask and @ifp.
- * ifa can be NULL.
- * Returns 0 on success
- */
- static int
- nd6_prefix_rtrequest(uint32_t fibnum, int cmd, struct sockaddr_in6 *dst,
- struct sockaddr_in6 *netmask, struct ifnet *ifp, struct ifaddr *ifa)
- {
- struct epoch_tracker et;
- int error;
- /* Prepare gateway */
- struct sockaddr_dl_short sdl = {
- .sdl_family = AF_LINK,
- .sdl_len = sizeof(struct sockaddr_dl_short),
- .sdl_type = ifp->if_type,
- .sdl_index = ifp->if_index,
- };
- struct rt_addrinfo info = {
- .rti_ifa = ifa,
- .rti_flags = RTF_PINNED | ((netmask != NULL) ? 0 : RTF_HOST),
- .rti_info = {
- [RTAX_DST] = (struct sockaddr *)dst,
- [RTAX_NETMASK] = (struct sockaddr *)netmask,
- [RTAX_GATEWAY] = (struct sockaddr *)&sdl,
- },
- };
- /* Don't set additional per-gw filters on removal */
- NET_EPOCH_ENTER(et);
- error = rib_handle_ifaddr_info(fibnum, cmd, &info);
- NET_EPOCH_EXIT(et);
- return (error);
- }
- static int
- nd6_prefix_onlink_rtrequest(struct nd_prefix *pr, struct ifaddr *ifa)
- {
- int error;
- struct sockaddr_in6 mask6 = {
- .sin6_family = AF_INET6,
- .sin6_len = sizeof(struct sockaddr_in6),
- .sin6_addr = pr->ndpr_mask,
- };
- struct sockaddr_in6 *pmask6 = (pr->ndpr_plen != 128) ? &mask6 : NULL;
- error = nd6_prefix_rtrequest(pr->ndpr_ifp->if_fib, RTM_ADD,
- &pr->ndpr_prefix, pmask6, pr->ndpr_ifp, ifa);
- if (error == 0)
- pr->ndpr_stateflags |= NDPRF_ONLINK;
- return (error);
- }
- static 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? */
- }
- 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,
- "%s: failed to find any ifaddr to add route for a "
- "prefix(%s/%d) on %s\n", __func__,
- ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
- pr->ndpr_plen, if_name(ifp)));
- error = 0;
- } else {
- error = nd6_prefix_onlink_rtrequest(pr, ifa);
- ifa_free(ifa);
- }
- NET_EPOCH_EXIT(et);
- 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;
- char ip6buf[INET6_ADDRSTRLEN];
- uint64_t genid;
- int a_failure;
- ND6_ONLINK_LOCK_ASSERT();
- ND6_UNLOCK_ASSERT();
- if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0)
- return (EEXIST);
- struct sockaddr_in6 mask6 = {
- .sin6_family = AF_INET6,
- .sin6_len = sizeof(struct sockaddr_in6),
- .sin6_addr = pr->ndpr_mask,
- };
- struct sockaddr_in6 *pmask6 = (pr->ndpr_plen != 128) ? &mask6 : NULL;
- error = nd6_prefix_rtrequest(ifp->if_fib, RTM_DELETE,
- &pr->ndpr_prefix, pmask6, ifp, NULL);
- 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,
- "%s: failed to recover a prefix "
- "%s/%d from %s to %s (errno=%d)\n",
- __func__, 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,
- "%s: failed to delete route: %s/%d on %s (errno=%d)\n",
- __func__, ip6_sprintf(ip6buf, &pr->ndpr_prefix.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);
- }
- /*
- * 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, "%s: failed to find a good random IFID\n",
- __func__));
- 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, "%s: failed to find a unique random IFID\n",
- __func__));
- 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,
- "%s: ifa update succeeded, but we got no ifaddr\n",
- __func__));
- 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
- rt6_deleteroute(const struct rtentry *rt, const struct nhop_object *nh,
- void *arg)
- {
- struct in6_addr *gate = (struct in6_addr *)arg;
- int nh_rt_flags;
- if (nh->gw_sa.sa_family != AF_INET6)
- return (0);
- if (!IN6_ARE_ADDR_EQUAL(gate, &nh->gw6_sa.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?
- */
- nh_rt_flags = nhop_get_rtflags(nh);
- if ((nh_rt_flags & RTF_STATIC) != 0)
- return (0);
- /*
- * We delete only host route. This means, in particular, we don't
- * delete default route.
- */
- if ((nh_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? */
- rib_foreach_table_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);
- }
- 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");
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