2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
38 #include "opt_inet6.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/malloc.h>
44 #include <sys/refcount.h>
45 #include <sys/socket.h>
46 #include <sys/sockio.h>
48 #include <sys/kernel.h>
50 #include <sys/errno.h>
51 #include <sys/rmlock.h>
52 #include <sys/rwlock.h>
53 #include <sys/sysctl.h>
54 #include <sys/syslog.h>
55 #include <sys/queue.h>
58 #include <net/if_var.h>
59 #include <net/if_types.h>
60 #include <net/if_dl.h>
61 #include <net/route.h>
62 #include <net/route/nhop.h>
63 #include <net/route/route_ctl.h>
64 #include <net/route/route_var.h>
65 #include <net/radix.h>
68 #include <netinet/in.h>
69 #include <net/if_llatbl.h>
70 #include <netinet6/in6_var.h>
71 #include <netinet6/in6_ifattach.h>
72 #include <netinet/ip6.h>
73 #include <netinet6/ip6_var.h>
74 #include <netinet6/nd6.h>
75 #include <netinet/icmp6.h>
76 #include <netinet6/scope6_var.h>
78 static struct nd_defrouter *defrtrlist_update(struct nd_defrouter *);
79 static int prelist_update(struct nd_prefixctl *, struct nd_defrouter *,
81 static int nd6_prefix_onlink(struct nd_prefix *);
83 TAILQ_HEAD(nd6_drhead, nd_defrouter);
84 VNET_DEFINE_STATIC(struct nd6_drhead, nd6_defrouter);
85 #define V_nd6_defrouter VNET(nd6_defrouter)
87 VNET_DECLARE(int, nd6_recalc_reachtm_interval);
88 #define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval)
90 VNET_DEFINE_STATIC(struct ifnet *, nd6_defifp);
91 VNET_DEFINE(int, nd6_defifindex);
92 #define V_nd6_defifp VNET(nd6_defifp)
94 VNET_DEFINE(int, ip6_use_tempaddr) = 0;
96 VNET_DEFINE(int, ip6_desync_factor);
97 VNET_DEFINE(u_int32_t, ip6_temp_preferred_lifetime) = DEF_TEMP_PREFERRED_LIFETIME;
98 VNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime) = DEF_TEMP_VALID_LIFETIME;
100 VNET_DEFINE(int, ip6_temp_regen_advance) = TEMPADDR_REGEN_ADVANCE;
103 VNET_DEFINE(int, nd6_ignore_ipv6_only_ra) = 1;
106 SYSCTL_DECL(_net_inet6_icmp6);
108 /* RTPREF_MEDIUM has to be 0! */
109 #define RTPREF_HIGH 1
110 #define RTPREF_MEDIUM 0
111 #define RTPREF_LOW (-1)
112 #define RTPREF_RESERVED (-2)
113 #define RTPREF_INVALID (-3) /* internal */
116 defrouter_ref(struct nd_defrouter *dr)
119 refcount_acquire(&dr->refcnt);
123 defrouter_rele(struct nd_defrouter *dr)
126 if (refcount_release(&dr->refcnt))
131 * Remove a router from the global list and optionally stash it in a
132 * caller-supplied queue.
135 defrouter_unlink(struct nd_defrouter *dr, struct nd6_drhead *drq)
140 TAILQ_REMOVE(&V_nd6_defrouter, dr, dr_entry);
143 TAILQ_INSERT_TAIL(drq, dr, dr_entry);
147 * Receive Router Solicitation Message - just for routers.
148 * Router solicitation/advertisement is mostly managed by userland program
149 * (rtadvd) so here we have no function like nd6_ra_output().
154 nd6_rs_input(struct mbuf *m, int off, int icmp6len)
158 struct nd_router_solicit *nd_rs;
159 struct in6_addr saddr6;
160 union nd_opts ndopts;
161 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
165 ifp = m->m_pkthdr.rcvif;
168 * Accept RS only when V_ip6_forwarding=1 and the interface has
169 * no ND6_IFF_ACCEPT_RTADV.
171 if (!V_ip6_forwarding || ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV)
174 /* RFC 6980: Nodes MUST silently ignore fragments */
175 if(m->m_flags & M_FRAGMENTED)
179 ip6 = mtod(m, struct ip6_hdr *);
180 if (__predict_false(ip6->ip6_hlim != 255)) {
181 ICMP6STAT_INC(icp6s_invlhlim);
183 "%s: invalid hlim (%d) from %s to %s on %s\n", __func__,
184 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
185 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
190 * Don't update the neighbor cache, if src = ::.
191 * This indicates that the src has no IP address assigned yet.
193 saddr6 = ip6->ip6_src;
194 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
197 if (m->m_len < off + icmp6len) {
198 m = m_pullup(m, off + icmp6len);
200 IP6STAT_INC(ip6s_exthdrtoolong);
204 ip6 = mtod(m, struct ip6_hdr *);
205 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
207 icmp6len -= sizeof(*nd_rs);
208 nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
209 if (nd6_options(&ndopts) < 0) {
211 "%s: invalid ND option, ignored\n", __func__));
212 /* nd6_options have incremented stats */
218 if (ndopts.nd_opts_src_lladdr) {
219 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
220 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
223 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
225 "%s: lladdrlen mismatch for %s (if %d, RS packet %d)\n",
226 __func__, ip6_sprintf(ip6bufs, &saddr6),
227 ifp->if_addrlen, lladdrlen - 2));
231 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
238 ICMP6STAT_INC(icp6s_badrs);
244 * An initial update routine for draft-ietf-6man-ipv6only-flag.
245 * We need to iterate over all default routers for the given
246 * interface to see whether they are all advertising the "S"
247 * (IPv6-Only) flag. If they do set, otherwise unset, the
248 * interface flag we later use to filter on.
251 defrtr_ipv6_only_ifp(struct ifnet *ifp)
253 struct nd_defrouter *dr;
254 bool ipv6_only, ipv6_only_old;
256 struct epoch_tracker et;
261 if (V_nd6_ignore_ipv6_only_ra != 0)
266 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry)
267 if (dr->ifp == ifp &&
268 (dr->raflags & ND_RA_FLAG_IPV6_ONLY) == 0)
272 IF_AFDATA_WLOCK(ifp);
273 ipv6_only_old = ND_IFINFO(ifp)->flags & ND6_IFF_IPV6_ONLY;
274 IF_AFDATA_WUNLOCK(ifp);
276 /* If nothing changed, we have an early exit. */
277 if (ipv6_only == ipv6_only_old)
282 * Should we want to set the IPV6-ONLY flag, check if the
283 * interface has a non-0/0 and non-link-local IPv4 address
284 * configured on it. If it has we will assume working
285 * IPv4 operations and will clear the interface flag.
287 has_ipv4_addr = false;
290 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
291 if (ifa->ifa_addr->sa_family != AF_INET)
294 satosin(ifa->ifa_addr)->sin_addr)) {
295 has_ipv4_addr = true;
301 if (ipv6_only && has_ipv4_addr) {
302 log(LOG_NOTICE, "%s rcvd RA w/ IPv6-Only flag set but has IPv4 "
303 "configured, ignoring IPv6-Only flag.\n", ifp->if_xname);
308 IF_AFDATA_WLOCK(ifp);
310 ND_IFINFO(ifp)->flags |= ND6_IFF_IPV6_ONLY;
312 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IPV6_ONLY;
313 IF_AFDATA_WUNLOCK(ifp);
316 /* Send notification of flag change. */
321 defrtr_ipv6_only_ipf_down(struct ifnet *ifp)
324 IF_AFDATA_WLOCK(ifp);
325 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IPV6_ONLY;
326 IF_AFDATA_WUNLOCK(ifp);
328 #endif /* EXPERIMENTAL */
331 nd6_ifnet_link_event(void *arg __unused, struct ifnet *ifp, int linkstate)
335 * XXX-BZ we might want to trigger re-evaluation of our default router
336 * availability. E.g., on link down the default router might be
337 * unreachable but a different interface might still have connectivity.
341 if (linkstate == LINK_STATE_DOWN)
342 defrtr_ipv6_only_ipf_down(ifp);
347 * Receive Router Advertisement Message.
350 * TODO: on-link bit on prefix information
351 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
354 nd6_ra_input(struct mbuf *m, int off, int icmp6len)
357 struct nd_ifinfo *ndi;
359 struct nd_router_advert *nd_ra;
360 struct in6_addr saddr6;
361 struct nd_defrouter *dr;
362 union nd_opts ndopts;
363 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
367 * We only accept RAs only when the per-interface flag
368 * ND6_IFF_ACCEPT_RTADV is on the receiving interface.
370 ifp = m->m_pkthdr.rcvif;
371 ndi = ND_IFINFO(ifp);
372 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
375 /* RFC 6980: Nodes MUST silently ignore fragments */
376 if(m->m_flags & M_FRAGMENTED)
379 ip6 = mtod(m, struct ip6_hdr *);
380 if (__predict_false(ip6->ip6_hlim != 255)) {
381 ICMP6STAT_INC(icp6s_invlhlim);
383 "%s: invalid hlim (%d) from %s to %s on %s\n", __func__,
384 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
385 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
389 saddr6 = ip6->ip6_src;
390 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
392 "%s: src %s is not link-local\n", __func__,
393 ip6_sprintf(ip6bufs, &saddr6)));
397 if (m->m_len < off + icmp6len) {
398 m = m_pullup(m, off + icmp6len);
400 IP6STAT_INC(ip6s_exthdrtoolong);
404 ip6 = mtod(m, struct ip6_hdr *);
405 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
407 icmp6len -= sizeof(*nd_ra);
408 nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
409 if (nd6_options(&ndopts) < 0) {
411 "%s: invalid ND option, ignored\n", __func__));
412 /* nd6_options have incremented stats */
419 struct nd_defrouter dr0;
420 u_int32_t advreachable = nd_ra->nd_ra_reachable;
422 /* remember if this is a multicasted advertisement */
423 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
426 bzero(&dr0, sizeof(dr0));
428 dr0.raflags = nd_ra->nd_ra_flags_reserved;
430 * Effectively-disable routes from RA messages when
431 * ND6_IFF_NO_RADR enabled on the receiving interface or
432 * (ip6.forwarding == 1 && ip6.rfc6204w3 != 1).
434 if (ndi->flags & ND6_IFF_NO_RADR)
436 else if (V_ip6_forwarding && !V_ip6_rfc6204w3)
439 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
440 dr0.expire = time_uptime + dr0.rtlifetime;
442 /* unspecified or not? (RFC 2461 6.3.4) */
444 advreachable = ntohl(advreachable);
445 if (advreachable <= MAX_REACHABLE_TIME &&
446 ndi->basereachable != advreachable) {
447 ndi->basereachable = advreachable;
448 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
449 ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */
452 if (nd_ra->nd_ra_retransmit)
453 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
454 if (nd_ra->nd_ra_curhoplimit) {
455 if (ndi->chlim < nd_ra->nd_ra_curhoplimit)
456 ndi->chlim = nd_ra->nd_ra_curhoplimit;
457 else if (ndi->chlim != nd_ra->nd_ra_curhoplimit) {
458 log(LOG_ERR, "RA with a lower CurHopLimit sent from "
459 "%s on %s (current = %d, received = %d). "
460 "Ignored.\n", ip6_sprintf(ip6bufs, &ip6->ip6_src),
461 if_name(ifp), ndi->chlim, nd_ra->nd_ra_curhoplimit);
464 dr = defrtrlist_update(&dr0);
466 defrtr_ipv6_only_ifp(ifp);
473 if (ndopts.nd_opts_pi) {
474 struct nd_opt_hdr *pt;
475 struct nd_opt_prefix_info *pi = NULL;
476 struct nd_prefixctl pr;
478 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
479 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
480 pt = (struct nd_opt_hdr *)((caddr_t)pt +
481 (pt->nd_opt_len << 3))) {
482 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
484 pi = (struct nd_opt_prefix_info *)pt;
486 if (pi->nd_opt_pi_len != 4) {
488 "%s: invalid option len %d for prefix "
489 "information option, ignored\n", __func__,
494 if (128 < pi->nd_opt_pi_prefix_len) {
496 "%s: invalid prefix len %d for prefix "
497 "information option, ignored\n", __func__,
498 pi->nd_opt_pi_prefix_len));
502 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
503 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
505 "%s: invalid prefix %s, ignored\n",
506 __func__, ip6_sprintf(ip6bufs,
507 &pi->nd_opt_pi_prefix)));
511 bzero(&pr, sizeof(pr));
512 pr.ndpr_prefix.sin6_family = AF_INET6;
513 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
514 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
515 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
517 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
518 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
519 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
520 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
521 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
522 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
523 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
524 (void)prelist_update(&pr, dr, m, mcast);
535 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
539 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
542 if (mtu < IPV6_MMTU) {
543 nd6log((LOG_INFO, "%s: bogus mtu option mtu=%lu sent "
544 "from %s, ignoring\n", __func__,
545 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src)));
550 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
551 ? ndi->maxmtu : ifp->if_mtu;
553 int change = (ndi->linkmtu != mtu);
557 /* in6_maxmtu may change */
562 nd6log((LOG_INFO, "%s: bogus mtu=%lu sent from %s; "
563 "exceeds maxmtu %lu, ignoring\n", __func__,
564 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu));
571 * Source link layer address
577 if (ndopts.nd_opts_src_lladdr) {
578 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
579 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
582 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
584 "%s: lladdrlen mismatch for %s (if %d, RA packet %d)\n",
585 __func__, ip6_sprintf(ip6bufs, &saddr6),
586 ifp->if_addrlen, lladdrlen - 2));
590 nd6_cache_lladdr(ifp, &saddr6, lladdr,
591 lladdrlen, ND_ROUTER_ADVERT, 0);
594 * Installing a link-layer address might change the state of the
595 * router's neighbor cache, which might also affect our on-link
596 * detection of adveritsed prefixes.
598 pfxlist_onlink_check();
606 ICMP6STAT_INC(icp6s_badra);
611 static struct nd_pfxrouter *
612 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
614 struct nd_pfxrouter *search;
618 LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) {
619 if (search->router == dr)
626 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
628 struct nd_pfxrouter *new;
634 if (pfxrtr_lookup(pr, dr) != NULL) {
640 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
647 if (pfxrtr_lookup(pr, dr) == NULL) {
648 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
651 /* We lost a race to add the reference. */
659 pfxlist_onlink_check();
663 pfxrtr_del(struct nd_pfxrouter *pfr)
668 LIST_REMOVE(pfr, pfr_entry);
669 defrouter_rele(pfr->router);
673 /* Default router list processing sub routines. */
675 defrouter_addreq(struct nd_defrouter *new)
677 struct sockaddr_in6 def, mask, gate;
678 struct rt_addrinfo info;
679 struct rib_cmd_info rc;
683 bzero(&def, sizeof(def));
684 bzero(&mask, sizeof(mask));
685 bzero(&gate, sizeof(gate));
687 def.sin6_len = mask.sin6_len = gate.sin6_len =
688 sizeof(struct sockaddr_in6);
689 def.sin6_family = gate.sin6_family = AF_INET6;
690 gate.sin6_addr = new->rtaddr;
691 fibnum = new->ifp->if_fib;
693 bzero((caddr_t)&info, sizeof(info));
694 info.rti_flags = RTF_GATEWAY;
695 info.rti_info[RTAX_DST] = (struct sockaddr *)&def;
696 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&gate;
697 info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&mask;
700 error = rib_action(fibnum, RTM_ADD, &info, &rc);
701 if (rc.rc_rt != NULL)
702 rt_routemsg(RTM_ADD, rc.rc_rt, new->ifp, 0, fibnum);
708 * Remove the default route for a given router.
709 * This is just a subroutine function for defrouter_select_fib(), and
710 * should not be called from anywhere else.
713 defrouter_delreq(struct nd_defrouter *dr)
715 struct sockaddr_in6 def, mask, gate;
716 struct rt_addrinfo info;
717 struct rib_cmd_info rc;
718 struct epoch_tracker et;
721 bzero(&def, sizeof(def));
722 bzero(&mask, sizeof(mask));
723 bzero(&gate, sizeof(gate));
725 def.sin6_len = mask.sin6_len = gate.sin6_len =
726 sizeof(struct sockaddr_in6);
727 def.sin6_family = gate.sin6_family = AF_INET6;
728 gate.sin6_addr = dr->rtaddr;
729 fibnum = dr->ifp->if_fib;
731 bzero((caddr_t)&info, sizeof(info));
732 info.rti_flags = RTF_GATEWAY;
733 info.rti_info[RTAX_DST] = (struct sockaddr *)&def;
734 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&gate;
735 info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&mask;
738 rib_action(fibnum, RTM_DELETE, &info, &rc);
739 if (rc.rc_rt != NULL)
740 rt_routemsg(RTM_DELETE, rc.rc_rt, dr->ifp, 0, fibnum);
747 defrouter_del(struct nd_defrouter *dr)
749 struct nd_defrouter *deldr = NULL;
750 struct nd_prefix *pr;
751 struct nd_pfxrouter *pfxrtr;
756 * Flush all the routing table entries that use the router
759 if (ND_IFINFO(dr->ifp)->flags & ND6_IFF_ACCEPT_RTADV)
760 rt6_flush(&dr->rtaddr, dr->ifp);
763 defrtr_ipv6_only_ifp(dr->ifp);
768 defrouter_delreq(dr);
772 * Also delete all the pointers to the router in each prefix lists.
775 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
776 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
781 pfxlist_onlink_check();
784 * If the router is the primary one, choose a new one.
785 * Note that defrouter_select_fib() will remove the current
786 * gateway from the routing table.
789 defrouter_select_fib(deldr->ifp->if_fib);
792 * Release the list reference.
797 struct nd_defrouter *
798 defrouter_lookup_locked(const struct in6_addr *addr, struct ifnet *ifp)
800 struct nd_defrouter *dr;
803 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry)
804 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) {
811 struct nd_defrouter *
812 defrouter_lookup(const struct in6_addr *addr, struct ifnet *ifp)
814 struct nd_defrouter *dr;
817 dr = defrouter_lookup_locked(addr, ifp);
823 * Remove all default routes from default router list.
826 defrouter_reset(void)
828 struct nd_defrouter *dr, **dra;
834 * We can't delete routes with the ND lock held, so make a copy of the
835 * current default router list and use that when deleting routes.
838 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry)
842 dra = malloc(count * sizeof(*dra), M_TEMP, M_WAITOK | M_ZERO);
845 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
853 for (i = 0; i < count && dra[i] != NULL; i++) {
854 defrouter_delreq(dra[i]);
855 defrouter_rele(dra[i]);
860 * XXX should we also nuke any default routers in the kernel, by
861 * going through them by rtalloc1()?
866 * Look up a matching default router list entry and remove it. Returns true if a
867 * matching entry was found, false otherwise.
870 defrouter_remove(struct in6_addr *addr, struct ifnet *ifp)
872 struct nd_defrouter *dr;
875 dr = defrouter_lookup_locked(addr, ifp);
881 defrouter_unlink(dr, NULL);
889 * for default router selection
890 * regards router-preference field as a 2-bit signed integer
893 rtpref(struct nd_defrouter *dr)
895 switch (dr->raflags & ND_RA_FLAG_RTPREF_MASK) {
896 case ND_RA_FLAG_RTPREF_HIGH:
897 return (RTPREF_HIGH);
898 case ND_RA_FLAG_RTPREF_MEDIUM:
899 case ND_RA_FLAG_RTPREF_RSV:
900 return (RTPREF_MEDIUM);
901 case ND_RA_FLAG_RTPREF_LOW:
905 * This case should never happen. If it did, it would mean a
906 * serious bug of kernel internal. We thus always bark here.
907 * Or, can we even panic?
909 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->raflags);
910 return (RTPREF_INVALID);
916 * Default Router Selection according to Section 6.3.6 of RFC 2461 and
917 * draft-ietf-ipngwg-router-selection:
918 * 1) Routers that are reachable or probably reachable should be preferred.
919 * If we have more than one (probably) reachable router, prefer ones
920 * with the highest router preference.
921 * 2) When no routers on the list are known to be reachable or
922 * probably reachable, routers SHOULD be selected in a round-robin
923 * fashion, regardless of router preference values.
924 * 3) If the Default Router List is empty, assume that all
925 * destinations are on-link.
927 * We assume nd_defrouter is sorted by router preference value.
928 * Since the code below covers both with and without router preference cases,
929 * we do not need to classify the cases by ifdef.
931 * At this moment, we do not try to install more than one default router,
932 * even when the multipath routing is available, because we're not sure about
933 * the benefits for stub hosts comparing to the risk of making the code
934 * complicated and the possibility of introducing bugs.
936 * We maintain a single list of routers for multiple FIBs, only considering one
937 * at a time based on the receiving interface's FIB. If @fibnum is RT_ALL_FIBS,
938 * we do the whole thing multiple times.
941 defrouter_select_fib(int fibnum)
943 struct epoch_tracker et;
944 struct nd_defrouter *dr, *selected_dr, *installed_dr;
945 struct llentry *ln = NULL;
947 if (fibnum == RT_ALL_FIBS) {
948 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
949 defrouter_select_fib(fibnum);
955 * Let's handle easy case (3) first:
956 * If default router list is empty, there's nothing to be done.
958 if (TAILQ_EMPTY(&V_nd6_defrouter)) {
964 * Search for a (probably) reachable router from the list.
965 * We just pick up the first reachable one (if any), assuming that
966 * the ordering rule of the list described in defrtrlist_update().
968 selected_dr = installed_dr = NULL;
969 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
971 if (selected_dr == NULL && dr->ifp->if_fib == fibnum &&
972 (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
973 ND6_IS_LLINFO_PROBREACH(ln)) {
975 defrouter_ref(selected_dr);
983 if (dr->installed && dr->ifp->if_fib == fibnum) {
984 if (installed_dr == NULL) {
986 defrouter_ref(installed_dr);
989 * this should not happen.
990 * warn for diagnosis.
992 log(LOG_ERR, "defrouter_select_fib: more than "
993 "one router is installed\n");
998 * If none of the default routers was found to be reachable,
999 * round-robin the list regardless of preference.
1000 * Otherwise, if we have an installed router, check if the selected
1001 * (reachable) router should really be preferred to the installed one.
1002 * We only prefer the new router when the old one is not reachable
1003 * or when the new one has a really higher preference value.
1005 if (selected_dr == NULL) {
1006 if (installed_dr == NULL ||
1007 TAILQ_NEXT(installed_dr, dr_entry) == NULL)
1008 dr = TAILQ_FIRST(&V_nd6_defrouter);
1010 dr = TAILQ_NEXT(installed_dr, dr_entry);
1012 /* Ensure we select a router for this FIB. */
1013 TAILQ_FOREACH_FROM(dr, &V_nd6_defrouter, dr_entry) {
1014 if (dr->ifp->if_fib == fibnum) {
1016 defrouter_ref(selected_dr);
1020 } else if (installed_dr != NULL) {
1021 NET_EPOCH_ENTER(et);
1022 if ((ln = nd6_lookup(&installed_dr->rtaddr, 0,
1023 installed_dr->ifp)) &&
1024 ND6_IS_LLINFO_PROBREACH(ln) &&
1025 installed_dr->ifp->if_fib == fibnum &&
1026 rtpref(selected_dr) <= rtpref(installed_dr)) {
1027 defrouter_rele(selected_dr);
1028 selected_dr = installed_dr;
1036 NET_EPOCH_ENTER(et);
1038 * If we selected a router for this FIB and it's different
1039 * than the installed one, remove the installed router and
1040 * install the selected one in its place.
1042 if (installed_dr != selected_dr) {
1043 if (installed_dr != NULL) {
1044 defrouter_delreq(installed_dr);
1045 defrouter_rele(installed_dr);
1047 if (selected_dr != NULL)
1048 defrouter_addreq(selected_dr);
1050 if (selected_dr != NULL)
1051 defrouter_rele(selected_dr);
1055 static struct nd_defrouter *
1056 defrtrlist_update(struct nd_defrouter *new)
1058 struct nd_defrouter *dr, *n;
1063 if (new->rtlifetime == 0) {
1064 defrouter_remove(&new->rtaddr, new->ifp);
1069 writelocked = false;
1071 dr = defrouter_lookup_locked(&new->rtaddr, new->ifp);
1073 oldpref = rtpref(dr);
1076 dr->raflags = new->raflags; /* XXX flag check */
1077 dr->rtlifetime = new->rtlifetime;
1078 dr->expire = new->expire;
1081 * If the preference does not change, there's no need
1082 * to sort the entries. Also make sure the selected
1083 * router is still installed in the kernel.
1085 if (dr->installed && rtpref(new) == oldpref) {
1095 * The router needs to be reinserted into the default router
1096 * list, so upgrade to a write lock. If that fails and the list
1097 * has potentially changed while the lock was dropped, we'll
1098 * redo the lookup with the write lock held.
1102 if (!ND6_TRY_UPGRADE()) {
1103 genid = V_nd6_list_genid;
1106 if (genid != V_nd6_list_genid)
1113 * The preferred router may have changed, so relocate this
1116 TAILQ_REMOVE(&V_nd6_defrouter, dr, dr_entry);
1119 n = malloc(sizeof(*n), M_IP6NDP, M_NOWAIT | M_ZERO);
1124 memcpy(n, new, sizeof(*n));
1125 /* Initialize with an extra reference for the caller. */
1126 refcount_init(&n->refcnt, 2);
1130 * Insert the new router in the Default Router List;
1131 * The Default Router List should be in the descending order
1132 * of router-preferece. Routers with the same preference are
1133 * sorted in the arriving time order.
1136 /* insert at the end of the group */
1137 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
1138 if (rtpref(n) > rtpref(dr))
1142 TAILQ_INSERT_BEFORE(dr, n, dr_entry);
1144 TAILQ_INSERT_TAIL(&V_nd6_defrouter, n, dr_entry);
1148 defrouter_select_fib(new->ifp->if_fib);
1154 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
1156 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
1157 ndpr->ndpr_preferred = 0;
1159 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime;
1160 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
1161 ndpr->ndpr_expire = 0;
1163 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime;
1169 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
1171 /* init ia6t_expire */
1172 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
1173 lt6->ia6t_expire = 0;
1175 lt6->ia6t_expire = time_uptime;
1176 lt6->ia6t_expire += lt6->ia6t_vltime;
1179 /* init ia6t_preferred */
1180 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
1181 lt6->ia6t_preferred = 0;
1183 lt6->ia6t_preferred = time_uptime;
1184 lt6->ia6t_preferred += lt6->ia6t_pltime;
1188 static struct in6_ifaddr *
1189 in6_ifadd(struct nd_prefixctl *pr, int mcast)
1191 struct ifnet *ifp = pr->ndpr_ifp;
1193 struct in6_aliasreq ifra;
1194 struct in6_ifaddr *ia, *ib;
1196 struct in6_addr mask;
1197 int prefixlen = pr->ndpr_plen;
1199 char ip6buf[INET6_ADDRSTRLEN];
1201 in6_prefixlen2mask(&mask, prefixlen);
1204 * find a link-local address (will be interface ID).
1205 * Is it really mandatory? Theoretically, a global or a site-local
1206 * address can be configured without a link-local address, if we
1207 * have a unique interface identifier...
1209 * it is not mandatory to have a link-local address, we can generate
1210 * interface identifier on the fly. we do this because:
1211 * (1) it should be the easiest way to find interface identifier.
1212 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1213 * for multiple addresses on a single interface, and possible shortcut
1214 * of DAD. we omitted DAD for this reason in the past.
1215 * (3) a user can prevent autoconfiguration of global address
1216 * by removing link-local address by hand (this is partly because we
1217 * don't have other way to control the use of IPv6 on an interface.
1218 * this has been our design choice - cf. NRL's "ifconfig auto").
1219 * (4) it is easier to manage when an interface has addresses
1220 * with the same interface identifier, than to have multiple addresses
1221 * with different interface identifiers.
1223 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
1225 ib = (struct in6_ifaddr *)ifa;
1229 /* prefixlen + ifidlen must be equal to 128 */
1230 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
1231 if (prefixlen != plen0) {
1234 "%s: wrong prefixlen for %s (prefix=%d ifid=%d)\n",
1235 __func__, if_name(ifp), prefixlen, 128 - plen0));
1240 in6_prepare_ifra(&ifra, &pr->ndpr_prefix.sin6_addr, &mask);
1242 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr, &mask);
1244 ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
1245 (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
1246 ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
1247 (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
1248 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
1249 (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
1250 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
1251 (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
1255 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
1256 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
1258 /* XXX: scope zone ID? */
1260 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
1263 * Make sure that we do not have this address already. This should
1264 * usually not happen, but we can still see this case, e.g., if we
1265 * have manually configured the exact address to be configured.
1267 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
1268 &ifra.ifra_addr.sin6_addr);
1271 /* this should be rare enough to make an explicit log */
1272 log(LOG_INFO, "in6_ifadd: %s is already configured\n",
1273 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr));
1278 * Allocate ifaddr structure, link into chain, etc.
1279 * If we are going to create a new address upon receiving a multicasted
1280 * RA, we need to impose a random delay before starting DAD.
1281 * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2]
1285 updateflags |= IN6_IFAUPDATE_DADDELAY;
1286 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) {
1288 "%s: failed to make ifaddr %s on %s (errno=%d)\n", __func__,
1289 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr),
1290 if_name(ifp), error));
1291 return (NULL); /* ifaddr must not have been allocated. */
1294 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1296 * XXXRW: Assumption of non-NULLness here might not be true with
1297 * fine-grained locking -- should we validate it? Or just return
1298 * earlier ifa rather than looking it up again?
1300 return (ia); /* this is always non-NULL and referenced. */
1303 static struct nd_prefix *
1304 nd6_prefix_lookup_locked(struct nd_prefixctl *key)
1306 struct nd_prefix *search;
1310 LIST_FOREACH(search, &V_nd_prefix, ndpr_entry) {
1311 if (key->ndpr_ifp == search->ndpr_ifp &&
1312 key->ndpr_plen == search->ndpr_plen &&
1313 in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr,
1314 &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) {
1315 nd6_prefix_ref(search);
1323 nd6_prefix_lookup(struct nd_prefixctl *key)
1325 struct nd_prefix *search;
1328 search = nd6_prefix_lookup_locked(key);
1334 nd6_prefix_ref(struct nd_prefix *pr)
1337 refcount_acquire(&pr->ndpr_refcnt);
1341 nd6_prefix_rele(struct nd_prefix *pr)
1344 if (refcount_release(&pr->ndpr_refcnt)) {
1345 KASSERT(LIST_EMPTY(&pr->ndpr_advrtrs),
1346 ("prefix %p has advertising routers", pr));
1352 nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr,
1353 struct nd_prefix **newp)
1355 struct nd_prefix *new;
1356 char ip6buf[INET6_ADDRSTRLEN];
1359 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
1362 refcount_init(&new->ndpr_refcnt, newp != NULL ? 2 : 1);
1363 new->ndpr_ifp = pr->ndpr_ifp;
1364 new->ndpr_prefix = pr->ndpr_prefix;
1365 new->ndpr_plen = pr->ndpr_plen;
1366 new->ndpr_vltime = pr->ndpr_vltime;
1367 new->ndpr_pltime = pr->ndpr_pltime;
1368 new->ndpr_flags = pr->ndpr_flags;
1369 if ((error = in6_init_prefix_ltimes(new)) != 0) {
1370 free(new, M_IP6NDP);
1373 new->ndpr_lastupdate = time_uptime;
1375 /* initialization */
1376 LIST_INIT(&new->ndpr_advrtrs);
1377 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
1378 /* make prefix in the canonical form */
1379 IN6_MASK_ADDR(&new->ndpr_prefix.sin6_addr, &new->ndpr_mask);
1382 LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry);
1386 /* ND_OPT_PI_FLAG_ONLINK processing */
1387 if (new->ndpr_raf_onlink) {
1388 struct epoch_tracker et;
1391 NET_EPOCH_ENTER(et);
1392 if ((error = nd6_prefix_onlink(new)) != 0) {
1393 nd6log((LOG_ERR, "%s: failed to make the prefix %s/%d "
1394 "on-link on %s (errno=%d)\n", __func__,
1395 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1396 pr->ndpr_plen, if_name(pr->ndpr_ifp), error));
1397 /* proceed anyway. XXX: is it correct? */
1400 ND6_ONLINK_UNLOCK();
1404 pfxrtr_add(new, dr);
1411 * Remove a prefix from the prefix list and optionally stash it in a
1412 * caller-provided list.
1414 * The ND6 lock must be held.
1417 nd6_prefix_unlink(struct nd_prefix *pr, struct nd_prhead *list)
1422 LIST_REMOVE(pr, ndpr_entry);
1425 LIST_INSERT_HEAD(list, pr, ndpr_entry);
1429 * Free an unlinked prefix, first marking it off-link if necessary.
1432 nd6_prefix_del(struct nd_prefix *pr)
1434 struct nd_pfxrouter *pfr, *next;
1436 char ip6buf[INET6_ADDRSTRLEN];
1438 KASSERT(pr->ndpr_addrcnt == 0,
1439 ("prefix %p has referencing addresses", pr));
1440 ND6_UNLOCK_ASSERT();
1443 * Though these flags are now meaningless, we'd rather keep the value
1444 * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users
1445 * when executing "ndp -p".
1447 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1449 if ((e = nd6_prefix_offlink(pr)) != 0) {
1451 "%s: failed to make the prefix %s/%d offlink on %s "
1452 "(errno=%d)\n", __func__,
1453 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1454 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
1455 /* what should we do? */
1457 ND6_ONLINK_UNLOCK();
1460 /* Release references to routers that have advertised this prefix. */
1462 LIST_FOREACH_SAFE(pfr, &pr->ndpr_advrtrs, pfr_entry, next)
1466 nd6_prefix_rele(pr);
1468 pfxlist_onlink_check();
1472 prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr,
1473 struct mbuf *m, int mcast)
1475 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
1477 struct ifnet *ifp = new->ndpr_ifp;
1478 struct nd_prefix *pr;
1481 struct in6_addrlifetime lt6_tmp;
1482 char ip6buf[INET6_ADDRSTRLEN];
1489 * Authenticity for NA consists authentication for
1490 * both IP header and IP datagrams, doesn't it ?
1492 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
1493 auth = ((m->m_flags & M_AUTHIPHDR) &&
1494 (m->m_flags & M_AUTHIPDGM));
1498 if ((pr = nd6_prefix_lookup(new)) != NULL) {
1500 * nd6_prefix_lookup() ensures that pr and new have the same
1501 * prefix on a same interface.
1505 * Update prefix information. Note that the on-link (L) bit
1506 * and the autonomous (A) bit should NOT be changed from 1
1509 if (new->ndpr_raf_onlink == 1)
1510 pr->ndpr_raf_onlink = 1;
1511 if (new->ndpr_raf_auto == 1)
1512 pr->ndpr_raf_auto = 1;
1513 if (new->ndpr_raf_onlink) {
1514 pr->ndpr_vltime = new->ndpr_vltime;
1515 pr->ndpr_pltime = new->ndpr_pltime;
1516 (void)in6_init_prefix_ltimes(pr); /* XXX error case? */
1517 pr->ndpr_lastupdate = time_uptime;
1520 if (new->ndpr_raf_onlink &&
1521 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1523 if ((error = nd6_prefix_onlink(pr)) != 0) {
1525 "%s: failed to make the prefix %s/%d "
1526 "on-link on %s (errno=%d)\n", __func__,
1528 &pr->ndpr_prefix.sin6_addr),
1529 pr->ndpr_plen, if_name(pr->ndpr_ifp),
1531 /* proceed anyway. XXX: is it correct? */
1533 ND6_ONLINK_UNLOCK();
1539 if (new->ndpr_vltime == 0)
1541 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
1544 error = nd6_prelist_add(new, dr, &pr);
1546 nd6log((LOG_NOTICE, "%s: nd6_prelist_add() failed for "
1547 "the prefix %s/%d on %s (errno=%d)\n", __func__,
1548 ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr),
1549 new->ndpr_plen, if_name(new->ndpr_ifp), error));
1550 goto end; /* we should just give up in this case. */
1554 * XXX: from the ND point of view, we can ignore a prefix
1555 * with the on-link bit being zero. However, we need a
1556 * prefix structure for references from autoconfigured
1557 * addresses. Thus, we explicitly make sure that the prefix
1558 * itself expires now.
1560 if (pr->ndpr_raf_onlink == 0) {
1561 pr->ndpr_vltime = 0;
1562 pr->ndpr_pltime = 0;
1563 in6_init_prefix_ltimes(pr);
1568 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1569 * Note that pr must be non NULL at this point.
1572 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1573 if (!new->ndpr_raf_auto)
1577 * 5.5.3 (b). the link-local prefix should have been ignored in
1581 /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */
1582 if (new->ndpr_pltime > new->ndpr_vltime) {
1583 error = EINVAL; /* XXX: won't be used */
1588 * 5.5.3 (d). If the prefix advertised is not equal to the prefix of
1589 * an address configured by stateless autoconfiguration already in the
1590 * list of addresses associated with the interface, and the Valid
1591 * Lifetime is not 0, form an address. We first check if we have
1592 * a matching prefix.
1593 * Note: we apply a clarification in rfc2462bis-02 here. We only
1594 * consider autoconfigured addresses while RFC2462 simply said
1597 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1598 struct in6_ifaddr *ifa6;
1599 u_int32_t remaininglifetime;
1601 if (ifa->ifa_addr->sa_family != AF_INET6)
1604 ifa6 = (struct in6_ifaddr *)ifa;
1607 * We only consider autoconfigured addresses as per rfc2462bis.
1609 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
1613 * Spec is not clear here, but I believe we should concentrate
1614 * on unicast (i.e. not anycast) addresses.
1615 * XXX: other ia6_flags? detached or duplicated?
1617 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
1621 * Ignore the address if it is not associated with a prefix
1622 * or is associated with a prefix that is different from this
1623 * one. (pr is never NULL here)
1625 if (ifa6->ia6_ndpr != pr)
1628 if (ia6_match == NULL) /* remember the first one */
1632 * An already autoconfigured address matched. Now that we
1633 * are sure there is at least one matched address, we can
1634 * proceed to 5.5.3. (e): update the lifetimes according to the
1635 * "two hours" rule and the privacy extension.
1636 * We apply some clarifications in rfc2462bis:
1637 * - use remaininglifetime instead of storedlifetime as a
1639 * - remove the dead code in the "two-hour" rule
1641 #define TWOHOUR (120*60)
1642 lt6_tmp = ifa6->ia6_lifetime;
1644 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1645 remaininglifetime = ND6_INFINITE_LIFETIME;
1646 else if (time_uptime - ifa6->ia6_updatetime >
1647 lt6_tmp.ia6t_vltime) {
1649 * The case of "invalid" address. We should usually
1650 * not see this case.
1652 remaininglifetime = 0;
1654 remaininglifetime = lt6_tmp.ia6t_vltime -
1655 (time_uptime - ifa6->ia6_updatetime);
1657 /* when not updating, keep the current stored lifetime. */
1658 lt6_tmp.ia6t_vltime = remaininglifetime;
1660 if (TWOHOUR < new->ndpr_vltime ||
1661 remaininglifetime < new->ndpr_vltime) {
1662 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1663 } else if (remaininglifetime <= TWOHOUR) {
1665 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1669 * new->ndpr_vltime <= TWOHOUR &&
1670 * TWOHOUR < remaininglifetime
1672 lt6_tmp.ia6t_vltime = TWOHOUR;
1675 /* The 2 hour rule is not imposed for preferred lifetime. */
1676 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1678 in6_init_address_ltimes(pr, <6_tmp);
1681 * We need to treat lifetimes for temporary addresses
1682 * differently, according to
1683 * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1);
1684 * we only update the lifetimes when they are in the maximum
1687 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
1688 u_int32_t maxvltime, maxpltime;
1690 if (V_ip6_temp_valid_lifetime >
1691 (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
1692 V_ip6_desync_factor)) {
1693 maxvltime = V_ip6_temp_valid_lifetime -
1694 (time_uptime - ifa6->ia6_createtime) -
1695 V_ip6_desync_factor;
1698 if (V_ip6_temp_preferred_lifetime >
1699 (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
1700 V_ip6_desync_factor)) {
1701 maxpltime = V_ip6_temp_preferred_lifetime -
1702 (time_uptime - ifa6->ia6_createtime) -
1703 V_ip6_desync_factor;
1707 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME ||
1708 lt6_tmp.ia6t_vltime > maxvltime) {
1709 lt6_tmp.ia6t_vltime = maxvltime;
1711 if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME ||
1712 lt6_tmp.ia6t_pltime > maxpltime) {
1713 lt6_tmp.ia6t_pltime = maxpltime;
1716 ifa6->ia6_lifetime = lt6_tmp;
1717 ifa6->ia6_updatetime = time_uptime;
1719 if (ia6_match == NULL && new->ndpr_vltime) {
1723 * 5.5.3 (d) (continued)
1724 * No address matched and the valid lifetime is non-zero.
1725 * Create a new address.
1729 * Prefix Length check:
1730 * If the sum of the prefix length and interface identifier
1731 * length does not equal 128 bits, the Prefix Information
1732 * option MUST be ignored. The length of the interface
1733 * identifier is defined in a separate link-type specific
1736 ifidlen = in6_if2idlen(ifp);
1738 /* this should not happen, so we always log it. */
1739 log(LOG_ERR, "prelist_update: IFID undefined (%s)\n",
1743 if (ifidlen + pr->ndpr_plen != 128) {
1745 "%s: invalid prefixlen %d for %s, ignored\n",
1746 __func__, pr->ndpr_plen, if_name(ifp)));
1750 if ((ia6 = in6_ifadd(new, mcast)) != NULL) {
1752 * note that we should use pr (not new) for reference.
1759 * When a new public address is created as described
1760 * in RFC2462, also create a new temporary address.
1763 * When an interface connects to a new link, a new
1764 * randomized interface identifier should be generated
1765 * immediately together with a new set of temporary
1766 * addresses. Thus, we specifiy 1 as the 2nd arg of
1769 if (V_ip6_use_tempaddr) {
1771 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) {
1772 nd6log((LOG_NOTICE, "%s: failed to "
1773 "create a temporary address "
1774 "(errno=%d)\n", __func__, e));
1777 ifa_free(&ia6->ia_ifa);
1780 * A newly added address might affect the status
1781 * of other addresses, so we check and update it.
1782 * XXX: what if address duplication happens?
1784 pfxlist_onlink_check();
1786 /* just set an error. do not bark here. */
1787 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1793 nd6_prefix_rele(pr);
1798 * A supplement function used in the on-link detection below;
1799 * detect if a given prefix has a (probably) reachable advertising router.
1800 * XXX: lengthy function name...
1802 static struct nd_pfxrouter *
1803 find_pfxlist_reachable_router(struct nd_prefix *pr)
1805 struct epoch_tracker et;
1806 struct nd_pfxrouter *pfxrtr;
1812 NET_EPOCH_ENTER(et);
1813 LIST_FOREACH(pfxrtr, &pr->ndpr_advrtrs, pfr_entry) {
1814 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp);
1817 canreach = ND6_IS_LLINFO_PROBREACH(ln);
1827 * Check if each prefix in the prefix list has at least one available router
1828 * that advertised the prefix (a router is "available" if its neighbor cache
1829 * entry is reachable or probably reachable).
1830 * If the check fails, the prefix may be off-link, because, for example,
1831 * we have moved from the network but the lifetime of the prefix has not
1832 * expired yet. So we should not use the prefix if there is another prefix
1833 * that has an available router.
1834 * But, if there is no prefix that has an available router, we still regard
1835 * all the prefixes as on-link. This is because we can't tell if all the
1836 * routers are simply dead or if we really moved from the network and there
1837 * is no router around us.
1840 pfxlist_onlink_check(void)
1842 struct nd_prefix *pr;
1843 struct in6_ifaddr *ifa;
1844 struct nd_defrouter *dr;
1845 struct nd_pfxrouter *pfxrtr = NULL;
1846 struct rm_priotracker in6_ifa_tracker;
1854 * Check if there is a prefix that has a reachable advertising
1857 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1858 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1863 * If we have no such prefix, check whether we still have a router
1864 * that does not advertise any prefixes.
1867 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
1868 struct nd_prefix *pr0;
1870 LIST_FOREACH(pr0, &V_nd_prefix, ndpr_entry) {
1871 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
1878 if (pr != NULL || (!TAILQ_EMPTY(&V_nd6_defrouter) && pfxrtr == NULL)) {
1880 * There is at least one prefix that has a reachable router,
1881 * or at least a router which probably does not advertise
1882 * any prefixes. The latter would be the case when we move
1883 * to a new link where we have a router that does not provide
1884 * prefixes and we configure an address by hand.
1885 * Detach prefixes which have no reachable advertising
1886 * router, and attach other prefixes.
1888 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1889 /* XXX: a link-local prefix should never be detached */
1890 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1891 pr->ndpr_raf_onlink == 0 ||
1892 pr->ndpr_raf_auto == 0)
1895 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1896 find_pfxlist_reachable_router(pr) == NULL)
1897 pr->ndpr_stateflags |= NDPRF_DETACHED;
1898 else if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1899 find_pfxlist_reachable_router(pr) != NULL)
1900 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1903 /* there is no prefix that has a reachable router */
1904 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1905 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1906 pr->ndpr_raf_onlink == 0 ||
1907 pr->ndpr_raf_auto == 0)
1909 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1914 * Remove each interface route associated with a (just) detached
1915 * prefix, and reinstall the interface route for a (just) attached
1916 * prefix. Note that all attempt of reinstallation does not
1917 * necessarily success, when a same prefix is shared among multiple
1918 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1919 * so we don't have to care about them.
1922 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1923 char ip6buf[INET6_ADDRSTRLEN];
1926 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1927 pr->ndpr_raf_onlink == 0 ||
1928 pr->ndpr_raf_auto == 0)
1931 flags = pr->ndpr_stateflags & (NDPRF_DETACHED | NDPRF_ONLINK);
1932 if (flags == 0 || flags == (NDPRF_DETACHED | NDPRF_ONLINK)) {
1933 genid = V_nd6_list_genid;
1935 if ((flags & NDPRF_ONLINK) != 0 &&
1936 (e = nd6_prefix_offlink(pr)) != 0) {
1938 "%s: failed to make %s/%d offlink "
1939 "(errno=%d)\n", __func__,
1941 &pr->ndpr_prefix.sin6_addr),
1943 } else if ((flags & NDPRF_ONLINK) == 0 &&
1944 (e = nd6_prefix_onlink(pr)) != 0) {
1946 "%s: failed to make %s/%d onlink "
1947 "(errno=%d)\n", __func__,
1949 &pr->ndpr_prefix.sin6_addr),
1953 if (genid != V_nd6_list_genid)
1959 * Changes on the prefix status might affect address status as well.
1960 * Make sure that all addresses derived from an attached prefix are
1961 * attached, and that all addresses derived from a detached prefix are
1962 * detached. Note, however, that a manually configured address should
1963 * always be attached.
1964 * The precise detection logic is same as the one for prefixes.
1966 IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1967 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1968 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1971 if (ifa->ia6_ndpr == NULL) {
1973 * This can happen when we first configure the address
1974 * (i.e. the address exists, but the prefix does not).
1975 * XXX: complicated relationships...
1980 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1984 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1985 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1988 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1991 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) {
1992 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1993 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1994 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1995 nd6_dad_start((struct ifaddr *)ifa, 0);
1998 ifa->ia6_flags |= IN6_IFF_DETACHED;
2002 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
2003 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
2006 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
2007 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
2008 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
2009 /* Do we need a delay in this case? */
2010 nd6_dad_start((struct ifaddr *)ifa, 0);
2014 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
2016 ND6_ONLINK_UNLOCK();
2020 nd6_prefix_onlink_rtrequest(struct nd_prefix *pr, struct ifaddr *ifa)
2022 struct sockaddr_dl_short sdl;
2023 struct sockaddr_in6 mask6;
2025 int error, a_failure, fibnum, maxfib;
2027 bzero(&mask6, sizeof(mask6));
2028 mask6.sin6_len = sizeof(mask6);
2029 mask6.sin6_addr = pr->ndpr_mask;
2030 rtflags = (ifa->ifa_flags & ~IFA_RTSELF) | RTF_UP;
2032 bzero(&sdl, sizeof(struct sockaddr_dl_short));
2033 sdl.sdl_len = sizeof(struct sockaddr_dl_short);
2034 sdl.sdl_family = AF_LINK;
2035 sdl.sdl_type = ifa->ifa_ifp->if_type;
2036 sdl.sdl_index = ifa->ifa_ifp->if_index;
2038 if(V_rt_add_addr_allfibs) {
2040 maxfib = rt_numfibs;
2042 fibnum = ifa->ifa_ifp->if_fib;
2043 maxfib = fibnum + 1;
2046 for (; fibnum < maxfib; fibnum++) {
2047 struct rt_addrinfo info;
2048 struct rib_cmd_info rc;
2050 bzero((caddr_t)&info, sizeof(info));
2051 info.rti_flags = rtflags;
2052 info.rti_info[RTAX_DST] = (struct sockaddr *)&pr->ndpr_prefix;
2053 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&sdl;
2054 info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&mask6;
2057 error = rib_action(fibnum, RTM_ADD, &info, &rc);
2059 char ip6buf[INET6_ADDRSTRLEN];
2060 char ip6bufg[INET6_ADDRSTRLEN];
2061 char ip6bufm[INET6_ADDRSTRLEN];
2062 struct sockaddr_in6 *sin6;
2064 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
2065 nd6log((LOG_ERR, "%s: failed to add "
2066 "route for a prefix (%s/%d) on %s, gw=%s, mask=%s, "
2067 "flags=%lx errno = %d\n", __func__,
2068 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
2069 pr->ndpr_plen, if_name(pr->ndpr_ifp),
2070 ip6_sprintf(ip6bufg, &sin6->sin6_addr),
2071 ip6_sprintf(ip6bufm, &mask6.sin6_addr),
2074 /* Save last error to return, see rtinit(). */
2079 pr->ndpr_stateflags |= NDPRF_ONLINK;
2080 rt_routemsg(RTM_ADD, rc.rc_rt, pr->ndpr_ifp, 0, fibnum);
2083 /* Return the last error we got. */
2088 nd6_prefix_onlink(struct nd_prefix *pr)
2090 struct epoch_tracker et;
2092 struct ifnet *ifp = pr->ndpr_ifp;
2093 struct nd_prefix *opr;
2094 char ip6buf[INET6_ADDRSTRLEN];
2097 ND6_ONLINK_LOCK_ASSERT();
2098 ND6_UNLOCK_ASSERT();
2100 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0)
2104 * Add the interface route associated with the prefix. Before
2105 * installing the route, check if there's the same prefix on another
2106 * interface, and the prefix has already installed the interface route.
2107 * Although such a configuration is expected to be rare, we explicitly
2111 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
2115 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
2118 if (!V_rt_add_addr_allfibs &&
2119 opr->ndpr_ifp->if_fib != pr->ndpr_ifp->if_fib)
2122 if (opr->ndpr_plen == pr->ndpr_plen &&
2123 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
2124 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
2132 * We prefer link-local addresses as the associated interface address.
2134 /* search for a link-local addr */
2135 NET_EPOCH_ENTER(et);
2136 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
2137 IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
2139 /* XXX: freebsd does not have ifa_ifwithaf */
2140 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2141 if (ifa->ifa_addr->sa_family == AF_INET6) {
2146 /* should we care about ia6_flags? */
2150 * This can still happen, when, for example, we receive an RA
2151 * containing a prefix with the L bit set and the A bit clear,
2152 * after removing all IPv6 addresses on the receiving
2153 * interface. This should, of course, be rare though.
2156 "%s: failed to find any ifaddr to add route for a "
2157 "prefix(%s/%d) on %s\n", __func__,
2158 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
2159 pr->ndpr_plen, if_name(ifp)));
2162 error = nd6_prefix_onlink_rtrequest(pr, ifa);
2171 nd6_prefix_offlink(struct nd_prefix *pr)
2174 struct ifnet *ifp = pr->ndpr_ifp;
2175 struct nd_prefix *opr;
2176 struct sockaddr_in6 sa6, mask6;
2177 char ip6buf[INET6_ADDRSTRLEN];
2179 int fibnum, maxfib, a_failure;
2180 struct epoch_tracker et;
2182 ND6_ONLINK_LOCK_ASSERT();
2183 ND6_UNLOCK_ASSERT();
2185 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0)
2188 bzero(&sa6, sizeof(sa6));
2189 sa6.sin6_family = AF_INET6;
2190 sa6.sin6_len = sizeof(sa6);
2191 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
2192 sizeof(struct in6_addr));
2193 bzero(&mask6, sizeof(mask6));
2194 mask6.sin6_family = AF_INET6;
2195 mask6.sin6_len = sizeof(sa6);
2196 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
2198 if (V_rt_add_addr_allfibs) {
2200 maxfib = rt_numfibs;
2202 fibnum = ifp->if_fib;
2203 maxfib = fibnum + 1;
2207 NET_EPOCH_ENTER(et);
2208 for (; fibnum < maxfib; fibnum++) {
2209 struct rt_addrinfo info;
2210 struct rib_cmd_info rc;
2212 bzero((caddr_t)&info, sizeof(info));
2213 info.rti_flags = RTF_GATEWAY;
2214 info.rti_info[RTAX_DST] = (struct sockaddr *)&sa6;
2215 info.rti_info[RTAX_GATEWAY] = NULL;
2216 info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&mask6;
2219 error = rib_action(fibnum, RTM_DELETE, &info, &rc);
2221 /* Save last error to return, see rtinit(). */
2226 /* report route deletion to the routing socket. */
2227 rt_routemsg(RTM_DELETE, rc.rc_rt, ifp, 0, fibnum);
2233 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
2236 * There might be the same prefix on another interface,
2237 * the prefix which could not be on-link just because we have
2238 * the interface route (see comments in nd6_prefix_onlink).
2239 * If there's one, try to make the prefix on-link on the
2244 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
2246 * KAME specific: detached prefixes should not be
2249 if (opr == pr || (opr->ndpr_stateflags &
2250 (NDPRF_ONLINK | NDPRF_DETACHED)) != 0)
2253 if (opr->ndpr_plen == pr->ndpr_plen &&
2254 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
2255 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
2258 genid = V_nd6_list_genid;
2260 if ((e = nd6_prefix_onlink(opr)) != 0) {
2262 "%s: failed to recover a prefix "
2263 "%s/%d from %s to %s (errno=%d)\n",
2264 __func__, ip6_sprintf(ip6buf,
2265 &opr->ndpr_prefix.sin6_addr),
2266 opr->ndpr_plen, if_name(ifp),
2267 if_name(opr->ndpr_ifp), e));
2271 if (genid != V_nd6_list_genid)
2277 /* XXX: can we still set the NDPRF_ONLINK flag? */
2279 "%s: failed to delete route: %s/%d on %s (errno=%d)\n",
2280 __func__, ip6_sprintf(ip6buf, &sa6.sin6_addr),
2281 pr->ndpr_plen, if_name(ifp), error));
2285 lltable_prefix_free(AF_INET6, (struct sockaddr *)&sa6,
2286 (struct sockaddr *)&mask6, LLE_STATIC);
2292 * ia0 - corresponding public address
2295 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay)
2297 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
2298 struct in6_ifaddr *newia;
2299 struct in6_aliasreq ifra;
2301 int trylimit = 3; /* XXX: adhoc value */
2303 u_int32_t randid[2];
2304 time_t vltime0, pltime0;
2306 in6_prepare_ifra(&ifra, &ia0->ia_addr.sin6_addr,
2307 &ia0->ia_prefixmask.sin6_addr);
2309 ifra.ifra_addr = ia0->ia_addr; /* XXX: do we need this ? */
2310 /* clear the old IFID */
2311 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr,
2312 &ifra.ifra_prefixmask.sin6_addr);
2315 if (in6_get_tmpifid(ifp, (u_int8_t *)randid,
2316 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) {
2317 nd6log((LOG_NOTICE, "%s: failed to find a good random IFID\n",
2321 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
2322 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
2323 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
2324 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
2327 * in6_get_tmpifid() quite likely provided a unique interface ID.
2328 * However, we may still have a chance to see collision, because
2329 * there may be a time lag between generation of the ID and generation
2330 * of the address. So, we'll do one more sanity check.
2333 if (in6_localip(&ifra.ifra_addr.sin6_addr) != 0) {
2334 if (trylimit-- > 0) {
2339 /* Give up. Something strange should have happened. */
2340 nd6log((LOG_NOTICE, "%s: failed to find a unique random IFID\n",
2346 * The Valid Lifetime is the lower of the Valid Lifetime of the
2347 * public address or TEMP_VALID_LIFETIME.
2348 * The Preferred Lifetime is the lower of the Preferred Lifetime
2349 * of the public address or TEMP_PREFERRED_LIFETIME -
2352 if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
2353 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
2354 (ia0->ia6_lifetime.ia6t_vltime -
2355 (time_uptime - ia0->ia6_updatetime));
2356 if (vltime0 > V_ip6_temp_valid_lifetime)
2357 vltime0 = V_ip6_temp_valid_lifetime;
2359 vltime0 = V_ip6_temp_valid_lifetime;
2360 if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
2361 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
2362 (ia0->ia6_lifetime.ia6t_pltime -
2363 (time_uptime - ia0->ia6_updatetime));
2364 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){
2365 pltime0 = V_ip6_temp_preferred_lifetime -
2366 V_ip6_desync_factor;
2369 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor;
2370 ifra.ifra_lifetime.ia6t_vltime = vltime0;
2371 ifra.ifra_lifetime.ia6t_pltime = pltime0;
2374 * A temporary address is created only if this calculated Preferred
2375 * Lifetime is greater than REGEN_ADVANCE time units.
2377 if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance)
2380 /* XXX: scope zone ID? */
2382 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
2384 /* allocate ifaddr structure, link into chain, etc. */
2387 updateflags |= IN6_IFAUPDATE_DADDELAY;
2388 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0)
2391 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
2392 if (newia == NULL) { /* XXX: can it happen? */
2394 "%s: ifa update succeeded, but we got no ifaddr\n",
2396 return (EINVAL); /* XXX */
2398 newia->ia6_ndpr = ia0->ia6_ndpr;
2399 newia->ia6_ndpr->ndpr_addrcnt++;
2400 ifa_free(&newia->ia_ifa);
2403 * A newly added address might affect the status of other addresses.
2404 * XXX: when the temporary address is generated with a new public
2405 * address, the onlink check is redundant. However, it would be safe
2406 * to do the check explicitly everywhere a new address is generated,
2407 * and, in fact, we surely need the check when we create a new
2408 * temporary address due to deprecation of an old temporary address.
2410 pfxlist_onlink_check();
2416 rt6_deleteroute(const struct rtentry *rt, const struct nhop_object *nh,
2419 struct in6_addr *gate = (struct in6_addr *)arg;
2422 if (nh->gw_sa.sa_family != AF_INET6)
2425 if (!IN6_ARE_ADDR_EQUAL(gate, &nh->gw6_sa.sin6_addr)) {
2430 * Do not delete a static route.
2431 * XXX: this seems to be a bit ad-hoc. Should we consider the
2432 * 'cloned' bit instead?
2434 nh_rt_flags = nhop_get_rtflags(nh);
2435 if ((nh_rt_flags & RTF_STATIC) != 0)
2439 * We delete only host route. This means, in particular, we don't
2440 * delete default route.
2442 if ((nh_rt_flags & RTF_HOST) == 0)
2450 * Delete all the routing table entries that use the specified gateway.
2451 * XXX: this function causes search through all entries of routing table, so
2452 * it shouldn't be called when acting as a router.
2455 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
2458 /* We'll care only link-local addresses */
2459 if (!IN6_IS_ADDR_LINKLOCAL(gateway))
2462 /* XXX Do we really need to walk any but the default FIB? */
2463 rib_foreach_table_walk_del(AF_INET6, rt6_deleteroute, (void *)gateway);
2467 nd6_setdefaultiface(int ifindex)
2471 if (ifindex < 0 || V_if_index < ifindex)
2473 if (ifindex != 0 && !ifnet_byindex(ifindex))
2476 if (V_nd6_defifindex != ifindex) {
2477 V_nd6_defifindex = ifindex;
2478 if (V_nd6_defifindex > 0)
2479 V_nd6_defifp = ifnet_byindex(V_nd6_defifindex);
2481 V_nd6_defifp = NULL;
2484 * Our current implementation assumes one-to-one maping between
2485 * interfaces and links, so it would be natural to use the
2486 * default interface as the default link.
2488 scope6_setdefault(V_nd6_defifp);
2495 nd6_defrouter_list_empty(void)
2498 return (TAILQ_EMPTY(&V_nd6_defrouter));
2502 nd6_defrouter_timer(void)
2504 struct nd_defrouter *dr, *ndr;
2505 struct nd6_drhead drq;
2510 TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr)
2511 if (dr->expire && dr->expire < time_uptime)
2512 defrouter_unlink(dr, &drq);
2515 while ((dr = TAILQ_FIRST(&drq)) != NULL) {
2516 TAILQ_REMOVE(&drq, dr, dr_entry);
2522 * Nuke default router list entries toward ifp.
2523 * We defer removal of default router list entries that is installed in the
2524 * routing table, in order to keep additional side effects as small as possible.
2527 nd6_defrouter_purge(struct ifnet *ifp)
2529 struct nd_defrouter *dr, *ndr;
2530 struct nd6_drhead drq;
2535 TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr) {
2539 defrouter_unlink(dr, &drq);
2541 TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr) {
2545 defrouter_unlink(dr, &drq);
2549 /* Delete the unlinked router objects. */
2550 while ((dr = TAILQ_FIRST(&drq)) != NULL) {
2551 TAILQ_REMOVE(&drq, dr, dr_entry);
2557 nd6_defrouter_flush_all(void)
2559 struct nd_defrouter *dr;
2560 struct nd6_drhead drq;
2565 while ((dr = TAILQ_FIRST(&V_nd6_defrouter)) != NULL)
2566 defrouter_unlink(dr, &drq);
2569 while ((dr = TAILQ_FIRST(&drq)) != NULL) {
2570 TAILQ_REMOVE(&drq, dr, dr_entry);
2576 nd6_defrouter_init(void)
2579 TAILQ_INIT(&V_nd6_defrouter);
2583 nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS)
2585 struct in6_defrouter d;
2586 struct nd_defrouter *dr;
2589 if (req->newptr != NULL)
2592 error = sysctl_wire_old_buffer(req, 0);
2596 bzero(&d, sizeof(d));
2597 d.rtaddr.sin6_family = AF_INET6;
2598 d.rtaddr.sin6_len = sizeof(d.rtaddr);
2601 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
2602 d.rtaddr.sin6_addr = dr->rtaddr;
2603 error = sa6_recoverscope(&d.rtaddr);
2606 d.flags = dr->raflags;
2607 d.rtlifetime = dr->rtlifetime;
2608 d.expire = dr->expire + (time_second - time_uptime);
2609 d.if_index = dr->ifp->if_index;
2610 error = SYSCTL_OUT(req, &d, sizeof(d));
2617 SYSCTL_PROC(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
2618 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
2619 NULL, 0, nd6_sysctl_drlist, "S,in6_defrouter",
2620 "NDP default router list");