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/syslog.h>
54 #include <sys/queue.h>
57 #include <net/if_var.h>
58 #include <net/if_types.h>
59 #include <net/if_dl.h>
60 #include <net/route.h>
61 #include <net/route_var.h>
62 #include <net/radix.h>
65 #include <netinet/in.h>
66 #include <net/if_llatbl.h>
67 #include <netinet6/in6_var.h>
68 #include <netinet6/in6_ifattach.h>
69 #include <netinet/ip6.h>
70 #include <netinet6/ip6_var.h>
71 #include <netinet6/nd6.h>
72 #include <netinet/icmp6.h>
73 #include <netinet6/scope6_var.h>
75 static int rtpref(struct nd_defrouter *);
76 static struct nd_defrouter *defrtrlist_update(struct nd_defrouter *);
77 static int prelist_update(struct nd_prefixctl *, struct nd_defrouter *,
79 static struct in6_ifaddr *in6_ifadd(struct nd_prefixctl *, int);
80 static struct nd_pfxrouter *pfxrtr_lookup(struct nd_prefix *,
81 struct nd_defrouter *);
82 static void pfxrtr_add(struct nd_prefix *, struct nd_defrouter *);
83 static void pfxrtr_del(struct nd_pfxrouter *);
84 static struct nd_pfxrouter *find_pfxlist_reachable_router(struct nd_prefix *);
85 static void defrouter_delreq(struct nd_defrouter *);
86 static void nd6_rtmsg(int, struct rtentry *);
88 static int in6_init_prefix_ltimes(struct nd_prefix *);
89 static void in6_init_address_ltimes(struct nd_prefix *,
90 struct in6_addrlifetime *);
92 static int rt6_deleteroute(const struct rtentry *, void *);
94 VNET_DECLARE(int, nd6_recalc_reachtm_interval);
95 #define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval)
97 static VNET_DEFINE(struct ifnet *, nd6_defifp);
98 VNET_DEFINE(int, nd6_defifindex);
99 #define V_nd6_defifp VNET(nd6_defifp)
101 VNET_DEFINE(int, ip6_use_tempaddr) = 0;
103 VNET_DEFINE(int, ip6_desync_factor);
104 VNET_DEFINE(u_int32_t, ip6_temp_preferred_lifetime) = DEF_TEMP_PREFERRED_LIFETIME;
105 VNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime) = DEF_TEMP_VALID_LIFETIME;
107 VNET_DEFINE(int, ip6_temp_regen_advance) = TEMPADDR_REGEN_ADVANCE;
109 /* RTPREF_MEDIUM has to be 0! */
110 #define RTPREF_HIGH 1
111 #define RTPREF_MEDIUM 0
112 #define RTPREF_LOW (-1)
113 #define RTPREF_RESERVED (-2)
114 #define RTPREF_INVALID (-3) /* internal */
117 * Receive Router Solicitation Message - just for routers.
118 * Router solicitation/advertisement is mostly managed by userland program
119 * (rtadvd) so here we have no function like nd6_ra_output().
124 nd6_rs_input(struct mbuf *m, int off, int icmp6len)
126 struct ifnet *ifp = m->m_pkthdr.rcvif;
127 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
128 struct nd_router_solicit *nd_rs;
129 struct in6_addr saddr6 = ip6->ip6_src;
132 union nd_opts ndopts;
133 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
136 * Accept RS only when V_ip6_forwarding=1 and the interface has
137 * no ND6_IFF_ACCEPT_RTADV.
139 if (!V_ip6_forwarding || ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV)
143 if (ip6->ip6_hlim != 255) {
145 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
146 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
147 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
152 * Don't update the neighbor cache, if src = ::.
153 * This indicates that the src has no IP address assigned yet.
155 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
158 #ifndef PULLDOWN_TEST
159 IP6_EXTHDR_CHECK(m, off, icmp6len,);
160 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
162 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
164 ICMP6STAT_INC(icp6s_tooshort);
169 icmp6len -= sizeof(*nd_rs);
170 nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
171 if (nd6_options(&ndopts) < 0) {
173 "nd6_rs_input: invalid ND option, ignored\n"));
174 /* nd6_options have incremented stats */
178 if (ndopts.nd_opts_src_lladdr) {
179 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
180 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
183 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
185 "nd6_rs_input: lladdrlen mismatch for %s "
186 "(if %d, RS packet %d)\n",
187 ip6_sprintf(ip6bufs, &saddr6),
188 ifp->if_addrlen, lladdrlen - 2));
192 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
199 ICMP6STAT_INC(icp6s_badrs);
204 * Receive Router Advertisement Message.
207 * TODO: on-link bit on prefix information
208 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
211 nd6_ra_input(struct mbuf *m, int off, int icmp6len)
213 struct ifnet *ifp = m->m_pkthdr.rcvif;
214 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
215 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
216 struct nd_router_advert *nd_ra;
217 struct in6_addr saddr6 = ip6->ip6_src;
219 union nd_opts ndopts;
220 struct nd_defrouter *dr;
221 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
226 * We only accept RAs only when the per-interface flag
227 * ND6_IFF_ACCEPT_RTADV is on the receiving interface.
229 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
232 if (ip6->ip6_hlim != 255) {
234 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
235 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
236 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
240 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
242 "nd6_ra_input: src %s is not link-local\n",
243 ip6_sprintf(ip6bufs, &saddr6)));
247 #ifndef PULLDOWN_TEST
248 IP6_EXTHDR_CHECK(m, off, icmp6len,);
249 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
251 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
253 ICMP6STAT_INC(icp6s_tooshort);
258 icmp6len -= sizeof(*nd_ra);
259 nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
260 if (nd6_options(&ndopts) < 0) {
262 "nd6_ra_input: invalid ND option, ignored\n"));
263 /* nd6_options have incremented stats */
268 struct nd_defrouter dr0;
269 u_int32_t advreachable = nd_ra->nd_ra_reachable;
271 /* remember if this is a multicasted advertisement */
272 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
275 bzero(&dr0, sizeof(dr0));
277 dr0.raflags = nd_ra->nd_ra_flags_reserved;
279 * Effectively-disable routes from RA messages when
280 * ND6_IFF_NO_RADR enabled on the receiving interface or
281 * (ip6.forwarding == 1 && ip6.rfc6204w3 != 1).
283 if (ndi->flags & ND6_IFF_NO_RADR)
285 else if (V_ip6_forwarding && !V_ip6_rfc6204w3)
288 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
289 dr0.expire = time_uptime + dr0.rtlifetime;
291 /* unspecified or not? (RFC 2461 6.3.4) */
293 advreachable = ntohl(advreachable);
294 if (advreachable <= MAX_REACHABLE_TIME &&
295 ndi->basereachable != advreachable) {
296 ndi->basereachable = advreachable;
297 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
298 ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */
301 if (nd_ra->nd_ra_retransmit)
302 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
303 if (nd_ra->nd_ra_curhoplimit) {
304 if (ndi->chlim < nd_ra->nd_ra_curhoplimit)
305 ndi->chlim = nd_ra->nd_ra_curhoplimit;
306 else if (ndi->chlim != nd_ra->nd_ra_curhoplimit) {
307 log(LOG_ERR, "RA with a lower CurHopLimit sent from "
308 "%s on %s (current = %d, received = %d). "
309 "Ignored.\n", ip6_sprintf(ip6bufs, &ip6->ip6_src),
310 if_name(ifp), ndi->chlim, nd_ra->nd_ra_curhoplimit);
313 dr = defrtrlist_update(&dr0);
319 if (ndopts.nd_opts_pi) {
320 struct nd_opt_hdr *pt;
321 struct nd_opt_prefix_info *pi = NULL;
322 struct nd_prefixctl pr;
324 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
325 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
326 pt = (struct nd_opt_hdr *)((caddr_t)pt +
327 (pt->nd_opt_len << 3))) {
328 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
330 pi = (struct nd_opt_prefix_info *)pt;
332 if (pi->nd_opt_pi_len != 4) {
334 "nd6_ra_input: invalid option "
335 "len %d for prefix information option, "
336 "ignored\n", pi->nd_opt_pi_len));
340 if (128 < pi->nd_opt_pi_prefix_len) {
342 "nd6_ra_input: invalid prefix "
343 "len %d for prefix information option, "
344 "ignored\n", pi->nd_opt_pi_prefix_len));
348 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
349 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
351 "nd6_ra_input: invalid prefix "
354 &pi->nd_opt_pi_prefix)));
358 bzero(&pr, sizeof(pr));
359 pr.ndpr_prefix.sin6_family = AF_INET6;
360 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
361 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
362 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
364 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
365 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
366 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
367 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
368 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
369 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
370 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
371 (void)prelist_update(&pr, dr, m, mcast);
382 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
386 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
389 if (mtu < IPV6_MMTU) {
390 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
391 "mtu=%lu sent from %s, ignoring\n",
392 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src)));
397 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
398 ? ndi->maxmtu : ifp->if_mtu;
400 int change = (ndi->linkmtu != mtu);
403 if (change) /* in6_maxmtu may change */
406 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
407 "mtu=%lu sent from %s; "
408 "exceeds maxmtu %lu, ignoring\n",
409 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu));
416 * Source link layer address
422 if (ndopts.nd_opts_src_lladdr) {
423 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
424 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
427 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
429 "nd6_ra_input: lladdrlen mismatch for %s "
430 "(if %d, RA packet %d)\n", ip6_sprintf(ip6bufs, &saddr6),
431 ifp->if_addrlen, lladdrlen - 2));
435 nd6_cache_lladdr(ifp, &saddr6, lladdr,
436 lladdrlen, ND_ROUTER_ADVERT, 0);
439 * Installing a link-layer address might change the state of the
440 * router's neighbor cache, which might also affect our on-link
441 * detection of adveritsed prefixes.
443 pfxlist_onlink_check();
451 ICMP6STAT_INC(icp6s_badra);
455 /* tell the change to user processes watching the routing socket. */
457 nd6_rtmsg(int cmd, struct rtentry *rt)
459 struct rt_addrinfo info;
463 bzero((caddr_t)&info, sizeof(info));
464 info.rti_info[RTAX_DST] = rt_key(rt);
465 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
466 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
470 ifa = TAILQ_FIRST(&ifp->if_addrhead);
471 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
473 IF_ADDR_RUNLOCK(ifp);
474 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
478 rt_missmsg_fib(cmd, &info, rt->rt_flags, 0, rt->rt_fibnum);
484 * default router list processing sub routines
488 defrouter_addreq(struct nd_defrouter *new)
490 struct sockaddr_in6 def, mask, gate;
491 struct rtentry *newrt = NULL;
494 bzero(&def, sizeof(def));
495 bzero(&mask, sizeof(mask));
496 bzero(&gate, sizeof(gate));
498 def.sin6_len = mask.sin6_len = gate.sin6_len =
499 sizeof(struct sockaddr_in6);
500 def.sin6_family = gate.sin6_family = AF_INET6;
501 gate.sin6_addr = new->rtaddr;
503 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&def,
504 (struct sockaddr *)&gate, (struct sockaddr *)&mask,
505 RTF_GATEWAY, &newrt, new->ifp->if_fib);
507 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
514 struct nd_defrouter *
515 defrouter_lookup_locked(struct in6_addr *addr, struct ifnet *ifp)
517 struct nd_defrouter *dr;
520 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry)
521 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) {
528 struct nd_defrouter *
529 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
531 struct nd_defrouter *dr;
534 dr = defrouter_lookup_locked(addr, ifp);
540 defrouter_ref(struct nd_defrouter *dr)
543 refcount_acquire(&dr->refcnt);
547 defrouter_rele(struct nd_defrouter *dr)
550 if (refcount_release(&dr->refcnt))
555 * Remove the default route for a given router.
556 * This is just a subroutine function for defrouter_select_fib(), and
557 * should not be called from anywhere else.
560 defrouter_delreq(struct nd_defrouter *dr)
562 struct sockaddr_in6 def, mask, gate;
563 struct rtentry *oldrt = NULL;
565 bzero(&def, sizeof(def));
566 bzero(&mask, sizeof(mask));
567 bzero(&gate, sizeof(gate));
569 def.sin6_len = mask.sin6_len = gate.sin6_len =
570 sizeof(struct sockaddr_in6);
571 def.sin6_family = gate.sin6_family = AF_INET6;
572 gate.sin6_addr = dr->rtaddr;
574 in6_rtrequest(RTM_DELETE, (struct sockaddr *)&def,
575 (struct sockaddr *)&gate,
576 (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt, dr->ifp->if_fib);
578 nd6_rtmsg(RTM_DELETE, oldrt);
586 * Remove all default routes from default router list.
589 defrouter_reset(void)
591 struct nd_defrouter *dr, **dra;
597 * We can't delete routes with the ND lock held, so make a copy of the
598 * current default router list and use that when deleting routes.
601 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry)
605 dra = malloc(count * sizeof(*dra), M_TEMP, M_WAITOK | M_ZERO);
608 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
616 for (i = 0; i < count && dra[i] != NULL; i++) {
617 defrouter_delreq(dra[i]);
618 defrouter_rele(dra[i]);
623 * XXX should we also nuke any default routers in the kernel, by
624 * going through them by rtalloc1()?
629 * Look up a matching default router list entry and remove it. Returns true if a
630 * matching entry was found, false otherwise.
633 defrouter_remove(struct in6_addr *addr, struct ifnet *ifp)
635 struct nd_defrouter *dr;
638 dr = defrouter_lookup_locked(addr, ifp);
644 defrouter_unlink(dr, NULL);
652 * Remove a router from the global list and optionally stash it in a
653 * caller-supplied queue.
655 * The ND lock must be held.
658 defrouter_unlink(struct nd_defrouter *dr, struct nd_drhead *drq)
662 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
665 TAILQ_INSERT_TAIL(drq, dr, dr_entry);
669 defrouter_del(struct nd_defrouter *dr)
671 struct nd_defrouter *deldr = NULL;
672 struct nd_prefix *pr;
673 struct nd_pfxrouter *pfxrtr;
678 * Flush all the routing table entries that use the router
681 if (ND_IFINFO(dr->ifp)->flags & ND6_IFF_ACCEPT_RTADV)
682 rt6_flush(&dr->rtaddr, dr->ifp);
686 defrouter_delreq(dr);
690 * Also delete all the pointers to the router in each prefix lists.
693 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
694 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
699 pfxlist_onlink_check();
702 * If the router is the primary one, choose a new one.
703 * Note that defrouter_select_fib() will remove the current
704 * gateway from the routing table.
707 defrouter_select_fib(deldr->ifp->if_fib);
710 * Release the list reference.
716 * Default Router Selection according to Section 6.3.6 of RFC 2461 and
717 * draft-ietf-ipngwg-router-selection:
718 * 1) Routers that are reachable or probably reachable should be preferred.
719 * If we have more than one (probably) reachable router, prefer ones
720 * with the highest router preference.
721 * 2) When no routers on the list are known to be reachable or
722 * probably reachable, routers SHOULD be selected in a round-robin
723 * fashion, regardless of router preference values.
724 * 3) If the Default Router List is empty, assume that all
725 * destinations are on-link.
727 * We assume nd_defrouter is sorted by router preference value.
728 * Since the code below covers both with and without router preference cases,
729 * we do not need to classify the cases by ifdef.
731 * At this moment, we do not try to install more than one default router,
732 * even when the multipath routing is available, because we're not sure about
733 * the benefits for stub hosts comparing to the risk of making the code
734 * complicated and the possibility of introducing bugs.
736 * We maintain a single list of routers for multiple FIBs, only considering one
737 * at a time based on the receiving interface's FIB. If @fibnum is RT_ALL_FIBS,
738 * we do the whole thing multiple times.
741 defrouter_select_fib(int fibnum)
743 struct nd_defrouter *dr, *selected_dr, *installed_dr;
744 struct llentry *ln = NULL;
746 if (fibnum == RT_ALL_FIBS) {
747 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
748 defrouter_select_fib(fibnum);
754 * Let's handle easy case (3) first:
755 * If default router list is empty, there's nothing to be done.
757 if (TAILQ_EMPTY(&V_nd_defrouter)) {
763 * Search for a (probably) reachable router from the list.
764 * We just pick up the first reachable one (if any), assuming that
765 * the ordering rule of the list described in defrtrlist_update().
767 selected_dr = installed_dr = NULL;
768 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
769 IF_AFDATA_RLOCK(dr->ifp);
770 if (selected_dr == NULL && dr->ifp->if_fib == fibnum &&
771 (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
772 ND6_IS_LLINFO_PROBREACH(ln)) {
774 defrouter_ref(selected_dr);
776 IF_AFDATA_RUNLOCK(dr->ifp);
782 if (dr->installed && dr->ifp->if_fib == fibnum) {
783 if (installed_dr == NULL) {
785 defrouter_ref(installed_dr);
788 * this should not happen.
789 * warn for diagnosis.
791 log(LOG_ERR, "defrouter_select_fib: more than "
792 "one router is installed\n");
797 * If none of the default routers was found to be reachable,
798 * round-robin the list regardless of preference.
799 * Otherwise, if we have an installed router, check if the selected
800 * (reachable) router should really be preferred to the installed one.
801 * We only prefer the new router when the old one is not reachable
802 * or when the new one has a really higher preference value.
804 if (selected_dr == NULL) {
805 if (installed_dr == NULL ||
806 TAILQ_NEXT(installed_dr, dr_entry) == NULL)
807 dr = TAILQ_FIRST(&V_nd_defrouter);
809 dr = TAILQ_NEXT(installed_dr, dr_entry);
811 /* Ensure we select a router for this FIB. */
812 TAILQ_FOREACH_FROM(dr, &V_nd_defrouter, dr_entry) {
813 if (dr->ifp->if_fib == fibnum) {
815 defrouter_ref(selected_dr);
819 } else if (installed_dr != NULL) {
820 IF_AFDATA_RLOCK(installed_dr->ifp);
821 if ((ln = nd6_lookup(&installed_dr->rtaddr, 0,
822 installed_dr->ifp)) &&
823 ND6_IS_LLINFO_PROBREACH(ln) &&
824 installed_dr->ifp->if_fib == fibnum &&
825 rtpref(selected_dr) <= rtpref(installed_dr)) {
826 defrouter_rele(selected_dr);
827 selected_dr = installed_dr;
829 IF_AFDATA_RUNLOCK(installed_dr->ifp);
836 * If we selected a router for this FIB and it's different
837 * than the installed one, remove the installed router and
838 * install the selected one in its place.
840 if (installed_dr != selected_dr) {
841 if (installed_dr != NULL) {
842 defrouter_delreq(installed_dr);
843 defrouter_rele(installed_dr);
845 if (selected_dr != NULL)
846 defrouter_addreq(selected_dr);
848 if (selected_dr != NULL)
849 defrouter_rele(selected_dr);
853 * Maintain old KPI for default router selection.
854 * If unspecified, we can re-select routers for all FIBs.
857 defrouter_select(void)
859 defrouter_select_fib(RT_ALL_FIBS);
863 * for default router selection
864 * regards router-preference field as a 2-bit signed integer
867 rtpref(struct nd_defrouter *dr)
869 switch (dr->raflags & ND_RA_FLAG_RTPREF_MASK) {
870 case ND_RA_FLAG_RTPREF_HIGH:
871 return (RTPREF_HIGH);
872 case ND_RA_FLAG_RTPREF_MEDIUM:
873 case ND_RA_FLAG_RTPREF_RSV:
874 return (RTPREF_MEDIUM);
875 case ND_RA_FLAG_RTPREF_LOW:
879 * This case should never happen. If it did, it would mean a
880 * serious bug of kernel internal. We thus always bark here.
881 * Or, can we even panic?
883 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->raflags);
884 return (RTPREF_INVALID);
889 static struct nd_defrouter *
890 defrtrlist_update(struct nd_defrouter *new)
892 struct nd_defrouter *dr, *n;
897 if (new->rtlifetime == 0) {
898 defrouter_remove(&new->rtaddr, new->ifp);
905 dr = defrouter_lookup_locked(&new->rtaddr, new->ifp);
907 oldpref = rtpref(dr);
910 dr->raflags = new->raflags; /* XXX flag check */
911 dr->rtlifetime = new->rtlifetime;
912 dr->expire = new->expire;
915 * If the preference does not change, there's no need
916 * to sort the entries. Also make sure the selected
917 * router is still installed in the kernel.
919 if (dr->installed && rtpref(new) == oldpref) {
929 * The router needs to be reinserted into the default router
930 * list, so upgrade to a write lock. If that fails and the list
931 * has potentially changed while the lock was dropped, we'll
932 * redo the lookup with the write lock held.
936 if (!ND6_TRY_UPGRADE()) {
937 genid = V_nd6_list_genid;
940 if (genid != V_nd6_list_genid)
947 * The preferred router may have changed, so relocate this
950 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
953 n = malloc(sizeof(*n), M_IP6NDP, M_NOWAIT | M_ZERO);
958 memcpy(n, new, sizeof(*n));
959 /* Initialize with an extra reference for the caller. */
960 refcount_init(&n->refcnt, 2);
964 * Insert the new router in the Default Router List;
965 * The Default Router List should be in the descending order
966 * of router-preferece. Routers with the same preference are
967 * sorted in the arriving time order.
970 /* insert at the end of the group */
971 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
972 if (rtpref(n) > rtpref(dr))
976 TAILQ_INSERT_BEFORE(dr, n, dr_entry);
978 TAILQ_INSERT_TAIL(&V_nd_defrouter, n, dr_entry);
982 defrouter_select_fib(new->ifp->if_fib);
987 static struct nd_pfxrouter *
988 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
990 struct nd_pfxrouter *search;
994 LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) {
995 if (search->router == dr)
1002 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
1004 struct nd_pfxrouter *new;
1007 ND6_UNLOCK_ASSERT();
1010 if (pfxrtr_lookup(pr, dr) != NULL) {
1016 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
1023 if (pfxrtr_lookup(pr, dr) == NULL) {
1024 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
1027 /* We lost a race to add the reference. */
1029 free(new, M_IP6NDP);
1035 pfxlist_onlink_check();
1039 pfxrtr_del(struct nd_pfxrouter *pfr)
1044 LIST_REMOVE(pfr, pfr_entry);
1045 defrouter_rele(pfr->router);
1046 free(pfr, M_IP6NDP);
1049 static struct nd_prefix *
1050 nd6_prefix_lookup_locked(struct nd_prefixctl *key)
1052 struct nd_prefix *search;
1056 LIST_FOREACH(search, &V_nd_prefix, ndpr_entry) {
1057 if (key->ndpr_ifp == search->ndpr_ifp &&
1058 key->ndpr_plen == search->ndpr_plen &&
1059 in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr,
1060 &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) {
1061 nd6_prefix_ref(search);
1069 nd6_prefix_lookup(struct nd_prefixctl *key)
1071 struct nd_prefix *search;
1074 search = nd6_prefix_lookup_locked(key);
1080 nd6_prefix_ref(struct nd_prefix *pr)
1083 refcount_acquire(&pr->ndpr_refcnt);
1087 nd6_prefix_rele(struct nd_prefix *pr)
1090 if (refcount_release(&pr->ndpr_refcnt)) {
1091 KASSERT(LIST_EMPTY(&pr->ndpr_advrtrs),
1092 ("prefix %p has advertising routers", pr));
1098 nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr,
1099 struct nd_prefix **newp)
1101 struct nd_prefix *new;
1102 char ip6buf[INET6_ADDRSTRLEN];
1105 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
1108 refcount_init(&new->ndpr_refcnt, newp != NULL ? 2 : 1);
1109 new->ndpr_ifp = pr->ndpr_ifp;
1110 new->ndpr_prefix = pr->ndpr_prefix;
1111 new->ndpr_plen = pr->ndpr_plen;
1112 new->ndpr_vltime = pr->ndpr_vltime;
1113 new->ndpr_pltime = pr->ndpr_pltime;
1114 new->ndpr_flags = pr->ndpr_flags;
1115 if ((error = in6_init_prefix_ltimes(new)) != 0) {
1116 free(new, M_IP6NDP);
1119 new->ndpr_lastupdate = time_uptime;
1121 /* initialization */
1122 LIST_INIT(&new->ndpr_advrtrs);
1123 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
1124 /* make prefix in the canonical form */
1125 IN6_MASK_ADDR(&new->ndpr_prefix.sin6_addr, &new->ndpr_mask);
1128 LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry);
1132 /* ND_OPT_PI_FLAG_ONLINK processing */
1133 if (new->ndpr_raf_onlink) {
1135 if ((error = nd6_prefix_onlink(new)) != 0) {
1136 nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
1137 "the prefix %s/%d on-link on %s (errno=%d)\n",
1138 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1139 pr->ndpr_plen, if_name(pr->ndpr_ifp), error));
1140 /* proceed anyway. XXX: is it correct? */
1142 ND6_ONLINK_UNLOCK();
1146 pfxrtr_add(new, dr);
1153 * Remove a prefix from the prefix list and optionally stash it in a
1154 * caller-provided list.
1156 * The ND6 lock must be held.
1159 nd6_prefix_unlink(struct nd_prefix *pr, struct nd_prhead *list)
1164 LIST_REMOVE(pr, ndpr_entry);
1167 LIST_INSERT_HEAD(list, pr, ndpr_entry);
1171 * Free an unlinked prefix, first marking it off-link if necessary.
1174 nd6_prefix_del(struct nd_prefix *pr)
1176 struct nd_pfxrouter *pfr, *next;
1178 char ip6buf[INET6_ADDRSTRLEN];
1180 KASSERT(pr->ndpr_addrcnt == 0,
1181 ("prefix %p has referencing addresses", pr));
1182 ND6_UNLOCK_ASSERT();
1185 * Though these flags are now meaningless, we'd rather keep the value
1186 * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users
1187 * when executing "ndp -p".
1189 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1191 if ((e = nd6_prefix_offlink(pr)) != 0) {
1193 "nd6_prefix_del: failed to make %s/%d offlink "
1194 "on %s, errno=%d\n",
1195 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1196 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
1197 /* what should we do? */
1199 ND6_ONLINK_UNLOCK();
1202 /* Release references to routers that have advertised this prefix. */
1204 LIST_FOREACH_SAFE(pfr, &pr->ndpr_advrtrs, pfr_entry, next)
1208 nd6_prefix_rele(pr);
1210 pfxlist_onlink_check();
1214 prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr,
1215 struct mbuf *m, int mcast)
1217 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
1219 struct ifnet *ifp = new->ndpr_ifp;
1220 struct nd_prefix *pr;
1223 struct in6_addrlifetime lt6_tmp;
1224 char ip6buf[INET6_ADDRSTRLEN];
1229 * Authenticity for NA consists authentication for
1230 * both IP header and IP datagrams, doesn't it ?
1232 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
1233 auth = ((m->m_flags & M_AUTHIPHDR) &&
1234 (m->m_flags & M_AUTHIPDGM));
1238 if ((pr = nd6_prefix_lookup(new)) != NULL) {
1240 * nd6_prefix_lookup() ensures that pr and new have the same
1241 * prefix on a same interface.
1245 * Update prefix information. Note that the on-link (L) bit
1246 * and the autonomous (A) bit should NOT be changed from 1
1249 if (new->ndpr_raf_onlink == 1)
1250 pr->ndpr_raf_onlink = 1;
1251 if (new->ndpr_raf_auto == 1)
1252 pr->ndpr_raf_auto = 1;
1253 if (new->ndpr_raf_onlink) {
1254 pr->ndpr_vltime = new->ndpr_vltime;
1255 pr->ndpr_pltime = new->ndpr_pltime;
1256 (void)in6_init_prefix_ltimes(pr); /* XXX error case? */
1257 pr->ndpr_lastupdate = time_uptime;
1260 if (new->ndpr_raf_onlink &&
1261 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1263 if ((error = nd6_prefix_onlink(pr)) != 0) {
1265 "prelist_update: failed to make "
1266 "the prefix %s/%d on-link on %s "
1269 &pr->ndpr_prefix.sin6_addr),
1270 pr->ndpr_plen, if_name(pr->ndpr_ifp),
1272 /* proceed anyway. XXX: is it correct? */
1274 ND6_ONLINK_UNLOCK();
1280 if (new->ndpr_vltime == 0)
1282 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
1285 error = nd6_prelist_add(new, dr, &pr);
1287 nd6log((LOG_NOTICE, "prelist_update: "
1288 "nd6_prelist_add failed for %s/%d on %s errno=%d\n",
1289 ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr),
1290 new->ndpr_plen, if_name(new->ndpr_ifp), error));
1291 goto end; /* we should just give up in this case. */
1295 * XXX: from the ND point of view, we can ignore a prefix
1296 * with the on-link bit being zero. However, we need a
1297 * prefix structure for references from autoconfigured
1298 * addresses. Thus, we explicitly make sure that the prefix
1299 * itself expires now.
1301 if (pr->ndpr_raf_onlink == 0) {
1302 pr->ndpr_vltime = 0;
1303 pr->ndpr_pltime = 0;
1304 in6_init_prefix_ltimes(pr);
1309 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1310 * Note that pr must be non NULL at this point.
1313 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1314 if (!new->ndpr_raf_auto)
1318 * 5.5.3 (b). the link-local prefix should have been ignored in
1322 /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */
1323 if (new->ndpr_pltime > new->ndpr_vltime) {
1324 error = EINVAL; /* XXX: won't be used */
1329 * 5.5.3 (d). If the prefix advertised is not equal to the prefix of
1330 * an address configured by stateless autoconfiguration already in the
1331 * list of addresses associated with the interface, and the Valid
1332 * Lifetime is not 0, form an address. We first check if we have
1333 * a matching prefix.
1334 * Note: we apply a clarification in rfc2462bis-02 here. We only
1335 * consider autoconfigured addresses while RFC2462 simply said
1339 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1340 struct in6_ifaddr *ifa6;
1341 u_int32_t remaininglifetime;
1343 if (ifa->ifa_addr->sa_family != AF_INET6)
1346 ifa6 = (struct in6_ifaddr *)ifa;
1349 * We only consider autoconfigured addresses as per rfc2462bis.
1351 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
1355 * Spec is not clear here, but I believe we should concentrate
1356 * on unicast (i.e. not anycast) addresses.
1357 * XXX: other ia6_flags? detached or duplicated?
1359 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
1363 * Ignore the address if it is not associated with a prefix
1364 * or is associated with a prefix that is different from this
1365 * one. (pr is never NULL here)
1367 if (ifa6->ia6_ndpr != pr)
1370 if (ia6_match == NULL) /* remember the first one */
1374 * An already autoconfigured address matched. Now that we
1375 * are sure there is at least one matched address, we can
1376 * proceed to 5.5.3. (e): update the lifetimes according to the
1377 * "two hours" rule and the privacy extension.
1378 * We apply some clarifications in rfc2462bis:
1379 * - use remaininglifetime instead of storedlifetime as a
1381 * - remove the dead code in the "two-hour" rule
1383 #define TWOHOUR (120*60)
1384 lt6_tmp = ifa6->ia6_lifetime;
1386 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1387 remaininglifetime = ND6_INFINITE_LIFETIME;
1388 else if (time_uptime - ifa6->ia6_updatetime >
1389 lt6_tmp.ia6t_vltime) {
1391 * The case of "invalid" address. We should usually
1392 * not see this case.
1394 remaininglifetime = 0;
1396 remaininglifetime = lt6_tmp.ia6t_vltime -
1397 (time_uptime - ifa6->ia6_updatetime);
1399 /* when not updating, keep the current stored lifetime. */
1400 lt6_tmp.ia6t_vltime = remaininglifetime;
1402 if (TWOHOUR < new->ndpr_vltime ||
1403 remaininglifetime < new->ndpr_vltime) {
1404 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1405 } else if (remaininglifetime <= TWOHOUR) {
1407 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1411 * new->ndpr_vltime <= TWOHOUR &&
1412 * TWOHOUR < remaininglifetime
1414 lt6_tmp.ia6t_vltime = TWOHOUR;
1417 /* The 2 hour rule is not imposed for preferred lifetime. */
1418 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1420 in6_init_address_ltimes(pr, <6_tmp);
1423 * We need to treat lifetimes for temporary addresses
1424 * differently, according to
1425 * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1);
1426 * we only update the lifetimes when they are in the maximum
1429 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
1430 u_int32_t maxvltime, maxpltime;
1432 if (V_ip6_temp_valid_lifetime >
1433 (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
1434 V_ip6_desync_factor)) {
1435 maxvltime = V_ip6_temp_valid_lifetime -
1436 (time_uptime - ifa6->ia6_createtime) -
1437 V_ip6_desync_factor;
1440 if (V_ip6_temp_preferred_lifetime >
1441 (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
1442 V_ip6_desync_factor)) {
1443 maxpltime = V_ip6_temp_preferred_lifetime -
1444 (time_uptime - ifa6->ia6_createtime) -
1445 V_ip6_desync_factor;
1449 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME ||
1450 lt6_tmp.ia6t_vltime > maxvltime) {
1451 lt6_tmp.ia6t_vltime = maxvltime;
1453 if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME ||
1454 lt6_tmp.ia6t_pltime > maxpltime) {
1455 lt6_tmp.ia6t_pltime = maxpltime;
1458 ifa6->ia6_lifetime = lt6_tmp;
1459 ifa6->ia6_updatetime = time_uptime;
1461 IF_ADDR_RUNLOCK(ifp);
1462 if (ia6_match == NULL && new->ndpr_vltime) {
1466 * 5.5.3 (d) (continued)
1467 * No address matched and the valid lifetime is non-zero.
1468 * Create a new address.
1472 * Prefix Length check:
1473 * If the sum of the prefix length and interface identifier
1474 * length does not equal 128 bits, the Prefix Information
1475 * option MUST be ignored. The length of the interface
1476 * identifier is defined in a separate link-type specific
1479 ifidlen = in6_if2idlen(ifp);
1481 /* this should not happen, so we always log it. */
1482 log(LOG_ERR, "prelist_update: IFID undefined (%s)\n",
1486 if (ifidlen + pr->ndpr_plen != 128) {
1488 "prelist_update: invalid prefixlen "
1489 "%d for %s, ignored\n",
1490 pr->ndpr_plen, if_name(ifp)));
1494 if ((ia6 = in6_ifadd(new, mcast)) != NULL) {
1496 * note that we should use pr (not new) for reference.
1503 * When a new public address is created as described
1504 * in RFC2462, also create a new temporary address.
1507 * When an interface connects to a new link, a new
1508 * randomized interface identifier should be generated
1509 * immediately together with a new set of temporary
1510 * addresses. Thus, we specifiy 1 as the 2nd arg of
1513 if (V_ip6_use_tempaddr) {
1515 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) {
1516 nd6log((LOG_NOTICE, "prelist_update: "
1517 "failed to create a temporary "
1518 "address, errno=%d\n",
1522 ifa_free(&ia6->ia_ifa);
1525 * A newly added address might affect the status
1526 * of other addresses, so we check and update it.
1527 * XXX: what if address duplication happens?
1529 pfxlist_onlink_check();
1531 /* just set an error. do not bark here. */
1532 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1538 nd6_prefix_rele(pr);
1543 * A supplement function used in the on-link detection below;
1544 * detect if a given prefix has a (probably) reachable advertising router.
1545 * XXX: lengthy function name...
1547 static struct nd_pfxrouter *
1548 find_pfxlist_reachable_router(struct nd_prefix *pr)
1550 struct nd_pfxrouter *pfxrtr;
1556 LIST_FOREACH(pfxrtr, &pr->ndpr_advrtrs, pfr_entry) {
1557 IF_AFDATA_RLOCK(pfxrtr->router->ifp);
1558 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp);
1559 IF_AFDATA_RUNLOCK(pfxrtr->router->ifp);
1562 canreach = ND6_IS_LLINFO_PROBREACH(ln);
1571 * Check if each prefix in the prefix list has at least one available router
1572 * that advertised the prefix (a router is "available" if its neighbor cache
1573 * entry is reachable or probably reachable).
1574 * If the check fails, the prefix may be off-link, because, for example,
1575 * we have moved from the network but the lifetime of the prefix has not
1576 * expired yet. So we should not use the prefix if there is another prefix
1577 * that has an available router.
1578 * But, if there is no prefix that has an available router, we still regard
1579 * all the prefixes as on-link. This is because we can't tell if all the
1580 * routers are simply dead or if we really moved from the network and there
1581 * is no router around us.
1584 pfxlist_onlink_check(void)
1586 struct nd_prefix *pr;
1587 struct in6_ifaddr *ifa;
1588 struct nd_defrouter *dr;
1589 struct nd_pfxrouter *pfxrtr = NULL;
1590 struct rm_priotracker in6_ifa_tracker;
1598 * Check if there is a prefix that has a reachable advertising
1601 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1602 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1607 * If we have no such prefix, check whether we still have a router
1608 * that does not advertise any prefixes.
1611 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
1612 struct nd_prefix *pr0;
1614 LIST_FOREACH(pr0, &V_nd_prefix, ndpr_entry) {
1615 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
1622 if (pr != NULL || (!TAILQ_EMPTY(&V_nd_defrouter) && pfxrtr == NULL)) {
1624 * There is at least one prefix that has a reachable router,
1625 * or at least a router which probably does not advertise
1626 * any prefixes. The latter would be the case when we move
1627 * to a new link where we have a router that does not provide
1628 * prefixes and we configure an address by hand.
1629 * Detach prefixes which have no reachable advertising
1630 * router, and attach other prefixes.
1632 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1633 /* XXX: a link-local prefix should never be detached */
1634 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1635 pr->ndpr_raf_onlink == 0 ||
1636 pr->ndpr_raf_auto == 0)
1639 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1640 find_pfxlist_reachable_router(pr) == NULL)
1641 pr->ndpr_stateflags |= NDPRF_DETACHED;
1642 else if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1643 find_pfxlist_reachable_router(pr) != NULL)
1644 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1647 /* there is no prefix that has a reachable router */
1648 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1649 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1650 pr->ndpr_raf_onlink == 0 ||
1651 pr->ndpr_raf_auto == 0)
1653 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1658 * Remove each interface route associated with a (just) detached
1659 * prefix, and reinstall the interface route for a (just) attached
1660 * prefix. Note that all attempt of reinstallation does not
1661 * necessarily success, when a same prefix is shared among multiple
1662 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1663 * so we don't have to care about them.
1666 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1667 char ip6buf[INET6_ADDRSTRLEN];
1670 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1671 pr->ndpr_raf_onlink == 0 ||
1672 pr->ndpr_raf_auto == 0)
1675 flags = pr->ndpr_stateflags & (NDPRF_DETACHED | NDPRF_ONLINK);
1676 if (flags == 0 || flags == (NDPRF_DETACHED | NDPRF_ONLINK)) {
1677 genid = V_nd6_list_genid;
1679 if ((flags & NDPRF_ONLINK) != 0 &&
1680 (e = nd6_prefix_offlink(pr)) != 0) {
1682 "pfxlist_onlink_check: failed to "
1683 "make %s/%d offlink, errno=%d\n",
1685 &pr->ndpr_prefix.sin6_addr),
1687 } else if ((flags & NDPRF_ONLINK) == 0 &&
1688 (e = nd6_prefix_onlink(pr)) != 0) {
1690 "pfxlist_onlink_check: failed to "
1691 "make %s/%d onlink, errno=%d\n",
1693 &pr->ndpr_prefix.sin6_addr),
1697 if (genid != V_nd6_list_genid)
1703 * Changes on the prefix status might affect address status as well.
1704 * Make sure that all addresses derived from an attached prefix are
1705 * attached, and that all addresses derived from a detached prefix are
1706 * detached. Note, however, that a manually configured address should
1707 * always be attached.
1708 * The precise detection logic is same as the one for prefixes.
1710 IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1711 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1712 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1715 if (ifa->ia6_ndpr == NULL) {
1717 * This can happen when we first configure the address
1718 * (i.e. the address exists, but the prefix does not).
1719 * XXX: complicated relationships...
1724 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1728 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1729 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1732 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1735 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) {
1736 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1737 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1738 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1739 nd6_dad_start((struct ifaddr *)ifa, 0);
1742 ifa->ia6_flags |= IN6_IFF_DETACHED;
1746 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1747 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1750 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1751 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1752 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1753 /* Do we need a delay in this case? */
1754 nd6_dad_start((struct ifaddr *)ifa, 0);
1758 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1760 ND6_ONLINK_UNLOCK();
1764 nd6_prefix_onlink_rtrequest(struct nd_prefix *pr, struct ifaddr *ifa)
1766 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
1767 struct rib_head *rnh;
1769 struct sockaddr_in6 mask6;
1771 int error, a_failure, fibnum, maxfib;
1774 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1775 * ifa->ifa_rtrequest = nd6_rtrequest;
1777 bzero(&mask6, sizeof(mask6));
1778 mask6.sin6_len = sizeof(mask6);
1779 mask6.sin6_addr = pr->ndpr_mask;
1780 rtflags = (ifa->ifa_flags & ~IFA_RTSELF) | RTF_UP;
1782 if(V_rt_add_addr_allfibs) {
1784 maxfib = rt_numfibs;
1786 fibnum = ifa->ifa_ifp->if_fib;
1787 maxfib = fibnum + 1;
1790 for (; fibnum < maxfib; fibnum++) {
1793 error = in6_rtrequest(RTM_ADD,
1794 (struct sockaddr *)&pr->ndpr_prefix, ifa->ifa_addr,
1795 (struct sockaddr *)&mask6, rtflags, &rt, fibnum);
1797 KASSERT(rt != NULL, ("%s: in6_rtrequest return no "
1798 "error(%d) but rt is NULL, pr=%p, ifa=%p", __func__,
1801 rnh = rt_tables_get_rnh(rt->rt_fibnum, AF_INET6);
1802 /* XXX what if rhn == NULL? */
1805 if (rt_setgate(rt, rt_key(rt),
1806 (struct sockaddr *)&null_sdl) == 0) {
1807 struct sockaddr_dl *dl;
1809 dl = (struct sockaddr_dl *)rt->rt_gateway;
1810 dl->sdl_type = rt->rt_ifp->if_type;
1811 dl->sdl_index = rt->rt_ifp->if_index;
1814 nd6_rtmsg(RTM_ADD, rt);
1816 pr->ndpr_stateflags |= NDPRF_ONLINK;
1818 char ip6buf[INET6_ADDRSTRLEN];
1819 char ip6bufg[INET6_ADDRSTRLEN];
1820 char ip6bufm[INET6_ADDRSTRLEN];
1821 struct sockaddr_in6 *sin6;
1823 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
1824 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add "
1825 "route for a prefix (%s/%d) on %s, gw=%s, mask=%s, "
1826 "flags=%lx errno = %d\n",
1827 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1828 pr->ndpr_plen, if_name(pr->ndpr_ifp),
1829 ip6_sprintf(ip6bufg, &sin6->sin6_addr),
1830 ip6_sprintf(ip6bufm, &mask6.sin6_addr),
1833 /* Save last error to return, see rtinit(). */
1844 /* Return the last error we got. */
1849 nd6_prefix_onlink(struct nd_prefix *pr)
1852 struct ifnet *ifp = pr->ndpr_ifp;
1853 struct nd_prefix *opr;
1854 char ip6buf[INET6_ADDRSTRLEN];
1857 ND6_ONLINK_LOCK_ASSERT();
1858 ND6_UNLOCK_ASSERT();
1860 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0)
1864 * Add the interface route associated with the prefix. Before
1865 * installing the route, check if there's the same prefix on another
1866 * interface, and the prefix has already installed the interface route.
1867 * Although such a configuration is expected to be rare, we explicitly
1871 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
1875 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
1878 if (!V_rt_add_addr_allfibs &&
1879 opr->ndpr_ifp->if_fib != pr->ndpr_ifp->if_fib)
1882 if (opr->ndpr_plen == pr->ndpr_plen &&
1883 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1884 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
1892 * We prefer link-local addresses as the associated interface address.
1894 /* search for a link-local addr */
1895 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
1896 IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
1898 /* XXX: freebsd does not have ifa_ifwithaf */
1900 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1901 if (ifa->ifa_addr->sa_family == AF_INET6) {
1906 IF_ADDR_RUNLOCK(ifp);
1907 /* should we care about ia6_flags? */
1911 * This can still happen, when, for example, we receive an RA
1912 * containing a prefix with the L bit set and the A bit clear,
1913 * after removing all IPv6 addresses on the receiving
1914 * interface. This should, of course, be rare though.
1917 "nd6_prefix_onlink: failed to find any ifaddr"
1918 " to add route for a prefix(%s/%d) on %s\n",
1919 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1920 pr->ndpr_plen, if_name(ifp)));
1924 error = nd6_prefix_onlink_rtrequest(pr, ifa);
1933 nd6_prefix_offlink(struct nd_prefix *pr)
1936 struct ifnet *ifp = pr->ndpr_ifp;
1937 struct nd_prefix *opr;
1938 struct sockaddr_in6 sa6, mask6;
1940 char ip6buf[INET6_ADDRSTRLEN];
1942 int fibnum, maxfib, a_failure;
1944 ND6_ONLINK_LOCK_ASSERT();
1945 ND6_UNLOCK_ASSERT();
1947 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0)
1950 bzero(&sa6, sizeof(sa6));
1951 sa6.sin6_family = AF_INET6;
1952 sa6.sin6_len = sizeof(sa6);
1953 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
1954 sizeof(struct in6_addr));
1955 bzero(&mask6, sizeof(mask6));
1956 mask6.sin6_family = AF_INET6;
1957 mask6.sin6_len = sizeof(sa6);
1958 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
1960 if (V_rt_add_addr_allfibs) {
1962 maxfib = rt_numfibs;
1964 fibnum = ifp->if_fib;
1965 maxfib = fibnum + 1;
1969 for (; fibnum < maxfib; fibnum++) {
1971 error = in6_rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
1972 (struct sockaddr *)&mask6, 0, &rt, fibnum);
1974 /* report the route deletion to the routing socket. */
1976 nd6_rtmsg(RTM_DELETE, rt);
1978 /* Save last error to return, see rtinit(). */
1988 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
1991 * There might be the same prefix on another interface,
1992 * the prefix which could not be on-link just because we have
1993 * the interface route (see comments in nd6_prefix_onlink).
1994 * If there's one, try to make the prefix on-link on the
1999 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
2001 * KAME specific: detached prefixes should not be
2004 if (opr == pr || (opr->ndpr_stateflags &
2005 (NDPRF_ONLINK | NDPRF_DETACHED)) != 0)
2008 if (opr->ndpr_plen == pr->ndpr_plen &&
2009 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
2010 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
2013 genid = V_nd6_list_genid;
2015 if ((e = nd6_prefix_onlink(opr)) != 0) {
2017 "nd6_prefix_offlink: failed to "
2018 "recover a prefix %s/%d from %s "
2019 "to %s (errno = %d)\n",
2021 &opr->ndpr_prefix.sin6_addr),
2022 opr->ndpr_plen, if_name(ifp),
2023 if_name(opr->ndpr_ifp), e));
2027 if (genid != V_nd6_list_genid)
2033 /* XXX: can we still set the NDPRF_ONLINK flag? */
2035 "nd6_prefix_offlink: failed to delete route: "
2036 "%s/%d on %s (errno = %d)\n",
2037 ip6_sprintf(ip6buf, &sa6.sin6_addr), pr->ndpr_plen,
2038 if_name(ifp), error));
2042 lltable_prefix_free(AF_INET6, (struct sockaddr *)&sa6,
2043 (struct sockaddr *)&mask6, LLE_STATIC);
2048 static struct in6_ifaddr *
2049 in6_ifadd(struct nd_prefixctl *pr, int mcast)
2051 struct ifnet *ifp = pr->ndpr_ifp;
2053 struct in6_aliasreq ifra;
2054 struct in6_ifaddr *ia, *ib;
2056 struct in6_addr mask;
2057 int prefixlen = pr->ndpr_plen;
2059 char ip6buf[INET6_ADDRSTRLEN];
2061 in6_prefixlen2mask(&mask, prefixlen);
2064 * find a link-local address (will be interface ID).
2065 * Is it really mandatory? Theoretically, a global or a site-local
2066 * address can be configured without a link-local address, if we
2067 * have a unique interface identifier...
2069 * it is not mandatory to have a link-local address, we can generate
2070 * interface identifier on the fly. we do this because:
2071 * (1) it should be the easiest way to find interface identifier.
2072 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
2073 * for multiple addresses on a single interface, and possible shortcut
2074 * of DAD. we omitted DAD for this reason in the past.
2075 * (3) a user can prevent autoconfiguration of global address
2076 * by removing link-local address by hand (this is partly because we
2077 * don't have other way to control the use of IPv6 on an interface.
2078 * this has been our design choice - cf. NRL's "ifconfig auto").
2079 * (4) it is easier to manage when an interface has addresses
2080 * with the same interface identifier, than to have multiple addresses
2081 * with different interface identifiers.
2083 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
2085 ib = (struct in6_ifaddr *)ifa;
2089 /* prefixlen + ifidlen must be equal to 128 */
2090 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
2091 if (prefixlen != plen0) {
2093 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
2094 "(prefix=%d ifid=%d)\n",
2095 if_name(ifp), prefixlen, 128 - plen0));
2100 in6_prepare_ifra(&ifra, &pr->ndpr_prefix.sin6_addr, &mask);
2102 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr, &mask);
2104 ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
2105 (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
2106 ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
2107 (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
2108 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
2109 (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
2110 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
2111 (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
2115 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
2116 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
2118 /* XXX: scope zone ID? */
2120 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
2123 * Make sure that we do not have this address already. This should
2124 * usually not happen, but we can still see this case, e.g., if we
2125 * have manually configured the exact address to be configured.
2127 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
2128 &ifra.ifra_addr.sin6_addr);
2131 /* this should be rare enough to make an explicit log */
2132 log(LOG_INFO, "in6_ifadd: %s is already configured\n",
2133 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr));
2138 * Allocate ifaddr structure, link into chain, etc.
2139 * If we are going to create a new address upon receiving a multicasted
2140 * RA, we need to impose a random delay before starting DAD.
2141 * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2]
2145 updateflags |= IN6_IFAUPDATE_DADDELAY;
2146 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) {
2148 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
2149 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr),
2150 if_name(ifp), error));
2151 return (NULL); /* ifaddr must not have been allocated. */
2154 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
2156 * XXXRW: Assumption of non-NULLness here might not be true with
2157 * fine-grained locking -- should we validate it? Or just return
2158 * earlier ifa rather than looking it up again?
2160 return (ia); /* this is always non-NULL and referenced. */
2164 * ia0 - corresponding public address
2167 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay)
2169 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
2170 struct in6_ifaddr *newia;
2171 struct in6_aliasreq ifra;
2173 int trylimit = 3; /* XXX: adhoc value */
2175 u_int32_t randid[2];
2176 time_t vltime0, pltime0;
2178 in6_prepare_ifra(&ifra, &ia0->ia_addr.sin6_addr,
2179 &ia0->ia_prefixmask.sin6_addr);
2181 ifra.ifra_addr = ia0->ia_addr; /* XXX: do we need this ? */
2182 /* clear the old IFID */
2183 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr,
2184 &ifra.ifra_prefixmask.sin6_addr);
2187 if (in6_get_tmpifid(ifp, (u_int8_t *)randid,
2188 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) {
2189 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find a good "
2193 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
2194 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
2195 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
2196 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
2199 * in6_get_tmpifid() quite likely provided a unique interface ID.
2200 * However, we may still have a chance to see collision, because
2201 * there may be a time lag between generation of the ID and generation
2202 * of the address. So, we'll do one more sanity check.
2205 if (in6_localip(&ifra.ifra_addr.sin6_addr) != 0) {
2206 if (trylimit-- > 0) {
2211 /* Give up. Something strange should have happened. */
2212 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to "
2213 "find a unique random IFID\n"));
2218 * The Valid Lifetime is the lower of the Valid Lifetime of the
2219 * public address or TEMP_VALID_LIFETIME.
2220 * The Preferred Lifetime is the lower of the Preferred Lifetime
2221 * of the public address or TEMP_PREFERRED_LIFETIME -
2224 if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
2225 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
2226 (ia0->ia6_lifetime.ia6t_vltime -
2227 (time_uptime - ia0->ia6_updatetime));
2228 if (vltime0 > V_ip6_temp_valid_lifetime)
2229 vltime0 = V_ip6_temp_valid_lifetime;
2231 vltime0 = V_ip6_temp_valid_lifetime;
2232 if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
2233 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
2234 (ia0->ia6_lifetime.ia6t_pltime -
2235 (time_uptime - ia0->ia6_updatetime));
2236 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){
2237 pltime0 = V_ip6_temp_preferred_lifetime -
2238 V_ip6_desync_factor;
2241 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor;
2242 ifra.ifra_lifetime.ia6t_vltime = vltime0;
2243 ifra.ifra_lifetime.ia6t_pltime = pltime0;
2246 * A temporary address is created only if this calculated Preferred
2247 * Lifetime is greater than REGEN_ADVANCE time units.
2249 if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance)
2252 /* XXX: scope zone ID? */
2254 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
2256 /* allocate ifaddr structure, link into chain, etc. */
2259 updateflags |= IN6_IFAUPDATE_DADDELAY;
2260 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0)
2263 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
2264 if (newia == NULL) { /* XXX: can it happen? */
2266 "in6_tmpifadd: ifa update succeeded, but we got "
2268 return (EINVAL); /* XXX */
2270 newia->ia6_ndpr = ia0->ia6_ndpr;
2271 newia->ia6_ndpr->ndpr_addrcnt++;
2272 ifa_free(&newia->ia_ifa);
2275 * A newly added address might affect the status of other addresses.
2276 * XXX: when the temporary address is generated with a new public
2277 * address, the onlink check is redundant. However, it would be safe
2278 * to do the check explicitly everywhere a new address is generated,
2279 * and, in fact, we surely need the check when we create a new
2280 * temporary address due to deprecation of an old temporary address.
2282 pfxlist_onlink_check();
2288 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
2290 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
2291 ndpr->ndpr_preferred = 0;
2293 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime;
2294 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
2295 ndpr->ndpr_expire = 0;
2297 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime;
2303 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
2305 /* init ia6t_expire */
2306 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
2307 lt6->ia6t_expire = 0;
2309 lt6->ia6t_expire = time_uptime;
2310 lt6->ia6t_expire += lt6->ia6t_vltime;
2313 /* init ia6t_preferred */
2314 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
2315 lt6->ia6t_preferred = 0;
2317 lt6->ia6t_preferred = time_uptime;
2318 lt6->ia6t_preferred += lt6->ia6t_pltime;
2323 * Delete all the routing table entries that use the specified gateway.
2324 * XXX: this function causes search through all entries of routing table, so
2325 * it shouldn't be called when acting as a router.
2328 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
2331 /* We'll care only link-local addresses */
2332 if (!IN6_IS_ADDR_LINKLOCAL(gateway))
2335 /* XXX Do we really need to walk any but the default FIB? */
2336 rt_foreach_fib_walk_del(AF_INET6, rt6_deleteroute, (void *)gateway);
2340 rt6_deleteroute(const struct rtentry *rt, void *arg)
2342 #define SIN6(s) ((struct sockaddr_in6 *)s)
2343 struct in6_addr *gate = (struct in6_addr *)arg;
2345 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
2348 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) {
2353 * Do not delete a static route.
2354 * XXX: this seems to be a bit ad-hoc. Should we consider the
2355 * 'cloned' bit instead?
2357 if ((rt->rt_flags & RTF_STATIC) != 0)
2361 * We delete only host route. This means, in particular, we don't
2362 * delete default route.
2364 if ((rt->rt_flags & RTF_HOST) == 0)
2372 nd6_setdefaultiface(int ifindex)
2376 if (ifindex < 0 || V_if_index < ifindex)
2378 if (ifindex != 0 && !ifnet_byindex(ifindex))
2381 if (V_nd6_defifindex != ifindex) {
2382 V_nd6_defifindex = ifindex;
2383 if (V_nd6_defifindex > 0)
2384 V_nd6_defifp = ifnet_byindex(V_nd6_defifindex);
2386 V_nd6_defifp = NULL;
2389 * Our current implementation assumes one-to-one maping between
2390 * interfaces and links, so it would be natural to use the
2391 * default interface as the default link.
2393 scope6_setdefault(V_nd6_defifp);