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)
142 /* RFC 6980: Nodes MUST silently ignore fragments */
143 if(m->m_flags & M_FRAGMENTED)
147 if (ip6->ip6_hlim != 255) {
149 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
150 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
151 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
156 * Don't update the neighbor cache, if src = ::.
157 * This indicates that the src has no IP address assigned yet.
159 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
162 #ifndef PULLDOWN_TEST
163 IP6_EXTHDR_CHECK(m, off, icmp6len,);
164 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
166 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
168 ICMP6STAT_INC(icp6s_tooshort);
173 icmp6len -= sizeof(*nd_rs);
174 nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
175 if (nd6_options(&ndopts) < 0) {
177 "nd6_rs_input: invalid ND option, ignored\n"));
178 /* nd6_options have incremented stats */
182 if (ndopts.nd_opts_src_lladdr) {
183 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
184 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
187 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
189 "nd6_rs_input: lladdrlen mismatch for %s "
190 "(if %d, RS packet %d)\n",
191 ip6_sprintf(ip6bufs, &saddr6),
192 ifp->if_addrlen, lladdrlen - 2));
196 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
203 ICMP6STAT_INC(icp6s_badrs);
208 * Receive Router Advertisement Message.
211 * TODO: on-link bit on prefix information
212 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
215 nd6_ra_input(struct mbuf *m, int off, int icmp6len)
217 struct ifnet *ifp = m->m_pkthdr.rcvif;
218 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
219 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
220 struct nd_router_advert *nd_ra;
221 struct in6_addr saddr6 = ip6->ip6_src;
223 union nd_opts ndopts;
224 struct nd_defrouter *dr;
225 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
230 * We only accept RAs only when the per-interface flag
231 * ND6_IFF_ACCEPT_RTADV is on the receiving interface.
233 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
236 /* RFC 6980: Nodes MUST silently ignore fragments */
237 if(m->m_flags & M_FRAGMENTED)
240 if (ip6->ip6_hlim != 255) {
242 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
243 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
244 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
248 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
250 "nd6_ra_input: src %s is not link-local\n",
251 ip6_sprintf(ip6bufs, &saddr6)));
255 #ifndef PULLDOWN_TEST
256 IP6_EXTHDR_CHECK(m, off, icmp6len,);
257 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
259 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
261 ICMP6STAT_INC(icp6s_tooshort);
266 icmp6len -= sizeof(*nd_ra);
267 nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
268 if (nd6_options(&ndopts) < 0) {
270 "nd6_ra_input: invalid ND option, ignored\n"));
271 /* nd6_options have incremented stats */
276 struct nd_defrouter dr0;
277 u_int32_t advreachable = nd_ra->nd_ra_reachable;
279 /* remember if this is a multicasted advertisement */
280 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
283 bzero(&dr0, sizeof(dr0));
285 dr0.raflags = nd_ra->nd_ra_flags_reserved;
287 * Effectively-disable routes from RA messages when
288 * ND6_IFF_NO_RADR enabled on the receiving interface or
289 * (ip6.forwarding == 1 && ip6.rfc6204w3 != 1).
291 if (ndi->flags & ND6_IFF_NO_RADR)
293 else if (V_ip6_forwarding && !V_ip6_rfc6204w3)
296 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
297 dr0.expire = time_uptime + dr0.rtlifetime;
299 /* unspecified or not? (RFC 2461 6.3.4) */
301 advreachable = ntohl(advreachable);
302 if (advreachable <= MAX_REACHABLE_TIME &&
303 ndi->basereachable != advreachable) {
304 ndi->basereachable = advreachable;
305 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
306 ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */
309 if (nd_ra->nd_ra_retransmit)
310 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
311 if (nd_ra->nd_ra_curhoplimit) {
312 if (ndi->chlim < nd_ra->nd_ra_curhoplimit)
313 ndi->chlim = nd_ra->nd_ra_curhoplimit;
314 else if (ndi->chlim != nd_ra->nd_ra_curhoplimit) {
315 log(LOG_ERR, "RA with a lower CurHopLimit sent from "
316 "%s on %s (current = %d, received = %d). "
317 "Ignored.\n", ip6_sprintf(ip6bufs, &ip6->ip6_src),
318 if_name(ifp), ndi->chlim, nd_ra->nd_ra_curhoplimit);
321 dr = defrtrlist_update(&dr0);
327 if (ndopts.nd_opts_pi) {
328 struct nd_opt_hdr *pt;
329 struct nd_opt_prefix_info *pi = NULL;
330 struct nd_prefixctl pr;
332 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
333 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
334 pt = (struct nd_opt_hdr *)((caddr_t)pt +
335 (pt->nd_opt_len << 3))) {
336 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
338 pi = (struct nd_opt_prefix_info *)pt;
340 if (pi->nd_opt_pi_len != 4) {
342 "nd6_ra_input: invalid option "
343 "len %d for prefix information option, "
344 "ignored\n", pi->nd_opt_pi_len));
348 if (128 < pi->nd_opt_pi_prefix_len) {
350 "nd6_ra_input: invalid prefix "
351 "len %d for prefix information option, "
352 "ignored\n", pi->nd_opt_pi_prefix_len));
356 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
357 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
359 "nd6_ra_input: invalid prefix "
362 &pi->nd_opt_pi_prefix)));
366 bzero(&pr, sizeof(pr));
367 pr.ndpr_prefix.sin6_family = AF_INET6;
368 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
369 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
370 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
372 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
373 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
374 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
375 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
376 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
377 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
378 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
379 (void)prelist_update(&pr, dr, m, mcast);
390 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
394 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
397 if (mtu < IPV6_MMTU) {
398 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
399 "mtu=%lu sent from %s, ignoring\n",
400 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src)));
405 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
406 ? ndi->maxmtu : ifp->if_mtu;
408 int change = (ndi->linkmtu != mtu);
411 if (change) /* in6_maxmtu may change */
414 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
415 "mtu=%lu sent from %s; "
416 "exceeds maxmtu %lu, ignoring\n",
417 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu));
424 * Source link layer address
430 if (ndopts.nd_opts_src_lladdr) {
431 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
432 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
435 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
437 "nd6_ra_input: lladdrlen mismatch for %s "
438 "(if %d, RA packet %d)\n", ip6_sprintf(ip6bufs, &saddr6),
439 ifp->if_addrlen, lladdrlen - 2));
443 nd6_cache_lladdr(ifp, &saddr6, lladdr,
444 lladdrlen, ND_ROUTER_ADVERT, 0);
447 * Installing a link-layer address might change the state of the
448 * router's neighbor cache, which might also affect our on-link
449 * detection of adveritsed prefixes.
451 pfxlist_onlink_check();
459 ICMP6STAT_INC(icp6s_badra);
463 /* tell the change to user processes watching the routing socket. */
465 nd6_rtmsg(int cmd, struct rtentry *rt)
467 struct rt_addrinfo info;
471 bzero((caddr_t)&info, sizeof(info));
472 info.rti_info[RTAX_DST] = rt_key(rt);
473 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
474 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
478 ifa = TAILQ_FIRST(&ifp->if_addrhead);
479 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
481 IF_ADDR_RUNLOCK(ifp);
482 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
486 rt_missmsg_fib(cmd, &info, rt->rt_flags, 0, rt->rt_fibnum);
492 * default router list processing sub routines
496 defrouter_addreq(struct nd_defrouter *new)
498 struct sockaddr_in6 def, mask, gate;
499 struct rtentry *newrt = NULL;
502 bzero(&def, sizeof(def));
503 bzero(&mask, sizeof(mask));
504 bzero(&gate, sizeof(gate));
506 def.sin6_len = mask.sin6_len = gate.sin6_len =
507 sizeof(struct sockaddr_in6);
508 def.sin6_family = gate.sin6_family = AF_INET6;
509 gate.sin6_addr = new->rtaddr;
511 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&def,
512 (struct sockaddr *)&gate, (struct sockaddr *)&mask,
513 RTF_GATEWAY, &newrt, new->ifp->if_fib);
515 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
522 struct nd_defrouter *
523 defrouter_lookup_locked(struct in6_addr *addr, struct ifnet *ifp)
525 struct nd_defrouter *dr;
528 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry)
529 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) {
536 struct nd_defrouter *
537 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
539 struct nd_defrouter *dr;
542 dr = defrouter_lookup_locked(addr, ifp);
548 defrouter_ref(struct nd_defrouter *dr)
551 refcount_acquire(&dr->refcnt);
555 defrouter_rele(struct nd_defrouter *dr)
558 if (refcount_release(&dr->refcnt))
563 * Remove the default route for a given router.
564 * This is just a subroutine function for defrouter_select_fib(), and
565 * should not be called from anywhere else.
568 defrouter_delreq(struct nd_defrouter *dr)
570 struct sockaddr_in6 def, mask, gate;
571 struct rtentry *oldrt = NULL;
573 bzero(&def, sizeof(def));
574 bzero(&mask, sizeof(mask));
575 bzero(&gate, sizeof(gate));
577 def.sin6_len = mask.sin6_len = gate.sin6_len =
578 sizeof(struct sockaddr_in6);
579 def.sin6_family = gate.sin6_family = AF_INET6;
580 gate.sin6_addr = dr->rtaddr;
582 in6_rtrequest(RTM_DELETE, (struct sockaddr *)&def,
583 (struct sockaddr *)&gate,
584 (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt, dr->ifp->if_fib);
586 nd6_rtmsg(RTM_DELETE, oldrt);
594 * Remove all default routes from default router list.
597 defrouter_reset(void)
599 struct nd_defrouter *dr, **dra;
605 * We can't delete routes with the ND lock held, so make a copy of the
606 * current default router list and use that when deleting routes.
609 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry)
613 dra = malloc(count * sizeof(*dra), M_TEMP, M_WAITOK | M_ZERO);
616 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
624 for (i = 0; i < count && dra[i] != NULL; i++) {
625 defrouter_delreq(dra[i]);
626 defrouter_rele(dra[i]);
631 * XXX should we also nuke any default routers in the kernel, by
632 * going through them by rtalloc1()?
637 * Look up a matching default router list entry and remove it. Returns true if a
638 * matching entry was found, false otherwise.
641 defrouter_remove(struct in6_addr *addr, struct ifnet *ifp)
643 struct nd_defrouter *dr;
646 dr = defrouter_lookup_locked(addr, ifp);
652 defrouter_unlink(dr, NULL);
660 * Remove a router from the global list and optionally stash it in a
661 * caller-supplied queue.
663 * The ND lock must be held.
666 defrouter_unlink(struct nd_defrouter *dr, struct nd_drhead *drq)
670 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
673 TAILQ_INSERT_TAIL(drq, dr, dr_entry);
677 defrouter_del(struct nd_defrouter *dr)
679 struct nd_defrouter *deldr = NULL;
680 struct nd_prefix *pr;
681 struct nd_pfxrouter *pfxrtr;
686 * Flush all the routing table entries that use the router
689 if (ND_IFINFO(dr->ifp)->flags & ND6_IFF_ACCEPT_RTADV)
690 rt6_flush(&dr->rtaddr, dr->ifp);
694 defrouter_delreq(dr);
698 * Also delete all the pointers to the router in each prefix lists.
701 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
702 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
707 pfxlist_onlink_check();
710 * If the router is the primary one, choose a new one.
711 * Note that defrouter_select_fib() will remove the current
712 * gateway from the routing table.
715 defrouter_select_fib(deldr->ifp->if_fib);
718 * Release the list reference.
724 * Default Router Selection according to Section 6.3.6 of RFC 2461 and
725 * draft-ietf-ipngwg-router-selection:
726 * 1) Routers that are reachable or probably reachable should be preferred.
727 * If we have more than one (probably) reachable router, prefer ones
728 * with the highest router preference.
729 * 2) When no routers on the list are known to be reachable or
730 * probably reachable, routers SHOULD be selected in a round-robin
731 * fashion, regardless of router preference values.
732 * 3) If the Default Router List is empty, assume that all
733 * destinations are on-link.
735 * We assume nd_defrouter is sorted by router preference value.
736 * Since the code below covers both with and without router preference cases,
737 * we do not need to classify the cases by ifdef.
739 * At this moment, we do not try to install more than one default router,
740 * even when the multipath routing is available, because we're not sure about
741 * the benefits for stub hosts comparing to the risk of making the code
742 * complicated and the possibility of introducing bugs.
744 * We maintain a single list of routers for multiple FIBs, only considering one
745 * at a time based on the receiving interface's FIB. If @fibnum is RT_ALL_FIBS,
746 * we do the whole thing multiple times.
749 defrouter_select_fib(int fibnum)
751 struct nd_defrouter *dr, *selected_dr, *installed_dr;
752 struct llentry *ln = NULL;
754 if (fibnum == RT_ALL_FIBS) {
755 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
756 defrouter_select_fib(fibnum);
762 * Let's handle easy case (3) first:
763 * If default router list is empty, there's nothing to be done.
765 if (TAILQ_EMPTY(&V_nd_defrouter)) {
771 * Search for a (probably) reachable router from the list.
772 * We just pick up the first reachable one (if any), assuming that
773 * the ordering rule of the list described in defrtrlist_update().
775 selected_dr = installed_dr = NULL;
776 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
777 IF_AFDATA_RLOCK(dr->ifp);
778 if (selected_dr == NULL && dr->ifp->if_fib == fibnum &&
779 (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
780 ND6_IS_LLINFO_PROBREACH(ln)) {
782 defrouter_ref(selected_dr);
784 IF_AFDATA_RUNLOCK(dr->ifp);
790 if (dr->installed && dr->ifp->if_fib == fibnum) {
791 if (installed_dr == NULL) {
793 defrouter_ref(installed_dr);
796 * this should not happen.
797 * warn for diagnosis.
799 log(LOG_ERR, "defrouter_select_fib: more than "
800 "one router is installed\n");
805 * If none of the default routers was found to be reachable,
806 * round-robin the list regardless of preference.
807 * Otherwise, if we have an installed router, check if the selected
808 * (reachable) router should really be preferred to the installed one.
809 * We only prefer the new router when the old one is not reachable
810 * or when the new one has a really higher preference value.
812 if (selected_dr == NULL) {
813 if (installed_dr == NULL ||
814 TAILQ_NEXT(installed_dr, dr_entry) == NULL)
815 dr = TAILQ_FIRST(&V_nd_defrouter);
817 dr = TAILQ_NEXT(installed_dr, dr_entry);
819 /* Ensure we select a router for this FIB. */
820 TAILQ_FOREACH_FROM(dr, &V_nd_defrouter, dr_entry) {
821 if (dr->ifp->if_fib == fibnum) {
823 defrouter_ref(selected_dr);
827 } else if (installed_dr != NULL) {
828 IF_AFDATA_RLOCK(installed_dr->ifp);
829 if ((ln = nd6_lookup(&installed_dr->rtaddr, 0,
830 installed_dr->ifp)) &&
831 ND6_IS_LLINFO_PROBREACH(ln) &&
832 installed_dr->ifp->if_fib == fibnum &&
833 rtpref(selected_dr) <= rtpref(installed_dr)) {
834 defrouter_rele(selected_dr);
835 selected_dr = installed_dr;
837 IF_AFDATA_RUNLOCK(installed_dr->ifp);
844 * If we selected a router for this FIB and it's different
845 * than the installed one, remove the installed router and
846 * install the selected one in its place.
848 if (installed_dr != selected_dr) {
849 if (installed_dr != NULL) {
850 defrouter_delreq(installed_dr);
851 defrouter_rele(installed_dr);
853 if (selected_dr != NULL)
854 defrouter_addreq(selected_dr);
856 if (selected_dr != NULL)
857 defrouter_rele(selected_dr);
861 * Maintain old KPI for default router selection.
862 * If unspecified, we can re-select routers for all FIBs.
865 defrouter_select(void)
867 defrouter_select_fib(RT_ALL_FIBS);
871 * for default router selection
872 * regards router-preference field as a 2-bit signed integer
875 rtpref(struct nd_defrouter *dr)
877 switch (dr->raflags & ND_RA_FLAG_RTPREF_MASK) {
878 case ND_RA_FLAG_RTPREF_HIGH:
879 return (RTPREF_HIGH);
880 case ND_RA_FLAG_RTPREF_MEDIUM:
881 case ND_RA_FLAG_RTPREF_RSV:
882 return (RTPREF_MEDIUM);
883 case ND_RA_FLAG_RTPREF_LOW:
887 * This case should never happen. If it did, it would mean a
888 * serious bug of kernel internal. We thus always bark here.
889 * Or, can we even panic?
891 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->raflags);
892 return (RTPREF_INVALID);
897 static struct nd_defrouter *
898 defrtrlist_update(struct nd_defrouter *new)
900 struct nd_defrouter *dr, *n;
905 if (new->rtlifetime == 0) {
906 defrouter_remove(&new->rtaddr, new->ifp);
913 dr = defrouter_lookup_locked(&new->rtaddr, new->ifp);
915 oldpref = rtpref(dr);
918 dr->raflags = new->raflags; /* XXX flag check */
919 dr->rtlifetime = new->rtlifetime;
920 dr->expire = new->expire;
923 * If the preference does not change, there's no need
924 * to sort the entries. Also make sure the selected
925 * router is still installed in the kernel.
927 if (dr->installed && rtpref(new) == oldpref) {
937 * The router needs to be reinserted into the default router
938 * list, so upgrade to a write lock. If that fails and the list
939 * has potentially changed while the lock was dropped, we'll
940 * redo the lookup with the write lock held.
944 if (!ND6_TRY_UPGRADE()) {
945 genid = V_nd6_list_genid;
948 if (genid != V_nd6_list_genid)
955 * The preferred router may have changed, so relocate this
958 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
961 n = malloc(sizeof(*n), M_IP6NDP, M_NOWAIT | M_ZERO);
966 memcpy(n, new, sizeof(*n));
967 /* Initialize with an extra reference for the caller. */
968 refcount_init(&n->refcnt, 2);
972 * Insert the new router in the Default Router List;
973 * The Default Router List should be in the descending order
974 * of router-preferece. Routers with the same preference are
975 * sorted in the arriving time order.
978 /* insert at the end of the group */
979 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
980 if (rtpref(n) > rtpref(dr))
984 TAILQ_INSERT_BEFORE(dr, n, dr_entry);
986 TAILQ_INSERT_TAIL(&V_nd_defrouter, n, dr_entry);
990 defrouter_select_fib(new->ifp->if_fib);
995 static struct nd_pfxrouter *
996 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
998 struct nd_pfxrouter *search;
1002 LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) {
1003 if (search->router == dr)
1010 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
1012 struct nd_pfxrouter *new;
1015 ND6_UNLOCK_ASSERT();
1018 if (pfxrtr_lookup(pr, dr) != NULL) {
1024 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
1031 if (pfxrtr_lookup(pr, dr) == NULL) {
1032 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
1035 /* We lost a race to add the reference. */
1037 free(new, M_IP6NDP);
1043 pfxlist_onlink_check();
1047 pfxrtr_del(struct nd_pfxrouter *pfr)
1052 LIST_REMOVE(pfr, pfr_entry);
1053 defrouter_rele(pfr->router);
1054 free(pfr, M_IP6NDP);
1057 static struct nd_prefix *
1058 nd6_prefix_lookup_locked(struct nd_prefixctl *key)
1060 struct nd_prefix *search;
1064 LIST_FOREACH(search, &V_nd_prefix, ndpr_entry) {
1065 if (key->ndpr_ifp == search->ndpr_ifp &&
1066 key->ndpr_plen == search->ndpr_plen &&
1067 in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr,
1068 &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) {
1069 nd6_prefix_ref(search);
1077 nd6_prefix_lookup(struct nd_prefixctl *key)
1079 struct nd_prefix *search;
1082 search = nd6_prefix_lookup_locked(key);
1088 nd6_prefix_ref(struct nd_prefix *pr)
1091 refcount_acquire(&pr->ndpr_refcnt);
1095 nd6_prefix_rele(struct nd_prefix *pr)
1098 if (refcount_release(&pr->ndpr_refcnt)) {
1099 KASSERT(LIST_EMPTY(&pr->ndpr_advrtrs),
1100 ("prefix %p has advertising routers", pr));
1106 nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr,
1107 struct nd_prefix **newp)
1109 struct nd_prefix *new;
1110 char ip6buf[INET6_ADDRSTRLEN];
1113 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
1116 refcount_init(&new->ndpr_refcnt, newp != NULL ? 2 : 1);
1117 new->ndpr_ifp = pr->ndpr_ifp;
1118 new->ndpr_prefix = pr->ndpr_prefix;
1119 new->ndpr_plen = pr->ndpr_plen;
1120 new->ndpr_vltime = pr->ndpr_vltime;
1121 new->ndpr_pltime = pr->ndpr_pltime;
1122 new->ndpr_flags = pr->ndpr_flags;
1123 if ((error = in6_init_prefix_ltimes(new)) != 0) {
1124 free(new, M_IP6NDP);
1127 new->ndpr_lastupdate = time_uptime;
1129 /* initialization */
1130 LIST_INIT(&new->ndpr_advrtrs);
1131 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
1132 /* make prefix in the canonical form */
1133 IN6_MASK_ADDR(&new->ndpr_prefix.sin6_addr, &new->ndpr_mask);
1136 LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry);
1140 /* ND_OPT_PI_FLAG_ONLINK processing */
1141 if (new->ndpr_raf_onlink) {
1143 if ((error = nd6_prefix_onlink(new)) != 0) {
1144 nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
1145 "the prefix %s/%d on-link on %s (errno=%d)\n",
1146 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1147 pr->ndpr_plen, if_name(pr->ndpr_ifp), error));
1148 /* proceed anyway. XXX: is it correct? */
1150 ND6_ONLINK_UNLOCK();
1154 pfxrtr_add(new, dr);
1161 * Remove a prefix from the prefix list and optionally stash it in a
1162 * caller-provided list.
1164 * The ND6 lock must be held.
1167 nd6_prefix_unlink(struct nd_prefix *pr, struct nd_prhead *list)
1172 LIST_REMOVE(pr, ndpr_entry);
1175 LIST_INSERT_HEAD(list, pr, ndpr_entry);
1179 * Free an unlinked prefix, first marking it off-link if necessary.
1182 nd6_prefix_del(struct nd_prefix *pr)
1184 struct nd_pfxrouter *pfr, *next;
1186 char ip6buf[INET6_ADDRSTRLEN];
1188 KASSERT(pr->ndpr_addrcnt == 0,
1189 ("prefix %p has referencing addresses", pr));
1190 ND6_UNLOCK_ASSERT();
1193 * Though these flags are now meaningless, we'd rather keep the value
1194 * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users
1195 * when executing "ndp -p".
1197 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1199 if ((e = nd6_prefix_offlink(pr)) != 0) {
1201 "nd6_prefix_del: failed to make %s/%d offlink "
1202 "on %s, errno=%d\n",
1203 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1204 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
1205 /* what should we do? */
1207 ND6_ONLINK_UNLOCK();
1210 /* Release references to routers that have advertised this prefix. */
1212 LIST_FOREACH_SAFE(pfr, &pr->ndpr_advrtrs, pfr_entry, next)
1216 nd6_prefix_rele(pr);
1218 pfxlist_onlink_check();
1222 prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr,
1223 struct mbuf *m, int mcast)
1225 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
1227 struct ifnet *ifp = new->ndpr_ifp;
1228 struct nd_prefix *pr;
1231 struct in6_addrlifetime lt6_tmp;
1232 char ip6buf[INET6_ADDRSTRLEN];
1237 * Authenticity for NA consists authentication for
1238 * both IP header and IP datagrams, doesn't it ?
1240 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
1241 auth = ((m->m_flags & M_AUTHIPHDR) &&
1242 (m->m_flags & M_AUTHIPDGM));
1246 if ((pr = nd6_prefix_lookup(new)) != NULL) {
1248 * nd6_prefix_lookup() ensures that pr and new have the same
1249 * prefix on a same interface.
1253 * Update prefix information. Note that the on-link (L) bit
1254 * and the autonomous (A) bit should NOT be changed from 1
1257 if (new->ndpr_raf_onlink == 1)
1258 pr->ndpr_raf_onlink = 1;
1259 if (new->ndpr_raf_auto == 1)
1260 pr->ndpr_raf_auto = 1;
1261 if (new->ndpr_raf_onlink) {
1262 pr->ndpr_vltime = new->ndpr_vltime;
1263 pr->ndpr_pltime = new->ndpr_pltime;
1264 (void)in6_init_prefix_ltimes(pr); /* XXX error case? */
1265 pr->ndpr_lastupdate = time_uptime;
1268 if (new->ndpr_raf_onlink &&
1269 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1271 if ((error = nd6_prefix_onlink(pr)) != 0) {
1273 "prelist_update: failed to make "
1274 "the prefix %s/%d on-link on %s "
1277 &pr->ndpr_prefix.sin6_addr),
1278 pr->ndpr_plen, if_name(pr->ndpr_ifp),
1280 /* proceed anyway. XXX: is it correct? */
1282 ND6_ONLINK_UNLOCK();
1288 if (new->ndpr_vltime == 0)
1290 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
1293 error = nd6_prelist_add(new, dr, &pr);
1295 nd6log((LOG_NOTICE, "prelist_update: "
1296 "nd6_prelist_add failed for %s/%d on %s errno=%d\n",
1297 ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr),
1298 new->ndpr_plen, if_name(new->ndpr_ifp), error));
1299 goto end; /* we should just give up in this case. */
1303 * XXX: from the ND point of view, we can ignore a prefix
1304 * with the on-link bit being zero. However, we need a
1305 * prefix structure for references from autoconfigured
1306 * addresses. Thus, we explicitly make sure that the prefix
1307 * itself expires now.
1309 if (pr->ndpr_raf_onlink == 0) {
1310 pr->ndpr_vltime = 0;
1311 pr->ndpr_pltime = 0;
1312 in6_init_prefix_ltimes(pr);
1317 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1318 * Note that pr must be non NULL at this point.
1321 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1322 if (!new->ndpr_raf_auto)
1326 * 5.5.3 (b). the link-local prefix should have been ignored in
1330 /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */
1331 if (new->ndpr_pltime > new->ndpr_vltime) {
1332 error = EINVAL; /* XXX: won't be used */
1337 * 5.5.3 (d). If the prefix advertised is not equal to the prefix of
1338 * an address configured by stateless autoconfiguration already in the
1339 * list of addresses associated with the interface, and the Valid
1340 * Lifetime is not 0, form an address. We first check if we have
1341 * a matching prefix.
1342 * Note: we apply a clarification in rfc2462bis-02 here. We only
1343 * consider autoconfigured addresses while RFC2462 simply said
1347 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1348 struct in6_ifaddr *ifa6;
1349 u_int32_t remaininglifetime;
1351 if (ifa->ifa_addr->sa_family != AF_INET6)
1354 ifa6 = (struct in6_ifaddr *)ifa;
1357 * We only consider autoconfigured addresses as per rfc2462bis.
1359 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
1363 * Spec is not clear here, but I believe we should concentrate
1364 * on unicast (i.e. not anycast) addresses.
1365 * XXX: other ia6_flags? detached or duplicated?
1367 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
1371 * Ignore the address if it is not associated with a prefix
1372 * or is associated with a prefix that is different from this
1373 * one. (pr is never NULL here)
1375 if (ifa6->ia6_ndpr != pr)
1378 if (ia6_match == NULL) /* remember the first one */
1382 * An already autoconfigured address matched. Now that we
1383 * are sure there is at least one matched address, we can
1384 * proceed to 5.5.3. (e): update the lifetimes according to the
1385 * "two hours" rule and the privacy extension.
1386 * We apply some clarifications in rfc2462bis:
1387 * - use remaininglifetime instead of storedlifetime as a
1389 * - remove the dead code in the "two-hour" rule
1391 #define TWOHOUR (120*60)
1392 lt6_tmp = ifa6->ia6_lifetime;
1394 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1395 remaininglifetime = ND6_INFINITE_LIFETIME;
1396 else if (time_uptime - ifa6->ia6_updatetime >
1397 lt6_tmp.ia6t_vltime) {
1399 * The case of "invalid" address. We should usually
1400 * not see this case.
1402 remaininglifetime = 0;
1404 remaininglifetime = lt6_tmp.ia6t_vltime -
1405 (time_uptime - ifa6->ia6_updatetime);
1407 /* when not updating, keep the current stored lifetime. */
1408 lt6_tmp.ia6t_vltime = remaininglifetime;
1410 if (TWOHOUR < new->ndpr_vltime ||
1411 remaininglifetime < new->ndpr_vltime) {
1412 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1413 } else if (remaininglifetime <= TWOHOUR) {
1415 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1419 * new->ndpr_vltime <= TWOHOUR &&
1420 * TWOHOUR < remaininglifetime
1422 lt6_tmp.ia6t_vltime = TWOHOUR;
1425 /* The 2 hour rule is not imposed for preferred lifetime. */
1426 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1428 in6_init_address_ltimes(pr, <6_tmp);
1431 * We need to treat lifetimes for temporary addresses
1432 * differently, according to
1433 * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1);
1434 * we only update the lifetimes when they are in the maximum
1437 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
1438 u_int32_t maxvltime, maxpltime;
1440 if (V_ip6_temp_valid_lifetime >
1441 (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
1442 V_ip6_desync_factor)) {
1443 maxvltime = V_ip6_temp_valid_lifetime -
1444 (time_uptime - ifa6->ia6_createtime) -
1445 V_ip6_desync_factor;
1448 if (V_ip6_temp_preferred_lifetime >
1449 (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
1450 V_ip6_desync_factor)) {
1451 maxpltime = V_ip6_temp_preferred_lifetime -
1452 (time_uptime - ifa6->ia6_createtime) -
1453 V_ip6_desync_factor;
1457 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME ||
1458 lt6_tmp.ia6t_vltime > maxvltime) {
1459 lt6_tmp.ia6t_vltime = maxvltime;
1461 if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME ||
1462 lt6_tmp.ia6t_pltime > maxpltime) {
1463 lt6_tmp.ia6t_pltime = maxpltime;
1466 ifa6->ia6_lifetime = lt6_tmp;
1467 ifa6->ia6_updatetime = time_uptime;
1469 IF_ADDR_RUNLOCK(ifp);
1470 if (ia6_match == NULL && new->ndpr_vltime) {
1474 * 5.5.3 (d) (continued)
1475 * No address matched and the valid lifetime is non-zero.
1476 * Create a new address.
1480 * Prefix Length check:
1481 * If the sum of the prefix length and interface identifier
1482 * length does not equal 128 bits, the Prefix Information
1483 * option MUST be ignored. The length of the interface
1484 * identifier is defined in a separate link-type specific
1487 ifidlen = in6_if2idlen(ifp);
1489 /* this should not happen, so we always log it. */
1490 log(LOG_ERR, "prelist_update: IFID undefined (%s)\n",
1494 if (ifidlen + pr->ndpr_plen != 128) {
1496 "prelist_update: invalid prefixlen "
1497 "%d for %s, ignored\n",
1498 pr->ndpr_plen, if_name(ifp)));
1502 if ((ia6 = in6_ifadd(new, mcast)) != NULL) {
1504 * note that we should use pr (not new) for reference.
1511 * When a new public address is created as described
1512 * in RFC2462, also create a new temporary address.
1515 * When an interface connects to a new link, a new
1516 * randomized interface identifier should be generated
1517 * immediately together with a new set of temporary
1518 * addresses. Thus, we specifiy 1 as the 2nd arg of
1521 if (V_ip6_use_tempaddr) {
1523 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) {
1524 nd6log((LOG_NOTICE, "prelist_update: "
1525 "failed to create a temporary "
1526 "address, errno=%d\n",
1530 ifa_free(&ia6->ia_ifa);
1533 * A newly added address might affect the status
1534 * of other addresses, so we check and update it.
1535 * XXX: what if address duplication happens?
1537 pfxlist_onlink_check();
1539 /* just set an error. do not bark here. */
1540 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1546 nd6_prefix_rele(pr);
1551 * A supplement function used in the on-link detection below;
1552 * detect if a given prefix has a (probably) reachable advertising router.
1553 * XXX: lengthy function name...
1555 static struct nd_pfxrouter *
1556 find_pfxlist_reachable_router(struct nd_prefix *pr)
1558 struct nd_pfxrouter *pfxrtr;
1564 LIST_FOREACH(pfxrtr, &pr->ndpr_advrtrs, pfr_entry) {
1565 IF_AFDATA_RLOCK(pfxrtr->router->ifp);
1566 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp);
1567 IF_AFDATA_RUNLOCK(pfxrtr->router->ifp);
1570 canreach = ND6_IS_LLINFO_PROBREACH(ln);
1579 * Check if each prefix in the prefix list has at least one available router
1580 * that advertised the prefix (a router is "available" if its neighbor cache
1581 * entry is reachable or probably reachable).
1582 * If the check fails, the prefix may be off-link, because, for example,
1583 * we have moved from the network but the lifetime of the prefix has not
1584 * expired yet. So we should not use the prefix if there is another prefix
1585 * that has an available router.
1586 * But, if there is no prefix that has an available router, we still regard
1587 * all the prefixes as on-link. This is because we can't tell if all the
1588 * routers are simply dead or if we really moved from the network and there
1589 * is no router around us.
1592 pfxlist_onlink_check(void)
1594 struct nd_prefix *pr;
1595 struct in6_ifaddr *ifa;
1596 struct nd_defrouter *dr;
1597 struct nd_pfxrouter *pfxrtr = NULL;
1598 struct rm_priotracker in6_ifa_tracker;
1606 * Check if there is a prefix that has a reachable advertising
1609 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1610 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1615 * If we have no such prefix, check whether we still have a router
1616 * that does not advertise any prefixes.
1619 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
1620 struct nd_prefix *pr0;
1622 LIST_FOREACH(pr0, &V_nd_prefix, ndpr_entry) {
1623 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
1630 if (pr != NULL || (!TAILQ_EMPTY(&V_nd_defrouter) && pfxrtr == NULL)) {
1632 * There is at least one prefix that has a reachable router,
1633 * or at least a router which probably does not advertise
1634 * any prefixes. The latter would be the case when we move
1635 * to a new link where we have a router that does not provide
1636 * prefixes and we configure an address by hand.
1637 * Detach prefixes which have no reachable advertising
1638 * router, and attach other prefixes.
1640 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1641 /* XXX: a link-local prefix should never be detached */
1642 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1643 pr->ndpr_raf_onlink == 0 ||
1644 pr->ndpr_raf_auto == 0)
1647 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1648 find_pfxlist_reachable_router(pr) == NULL)
1649 pr->ndpr_stateflags |= NDPRF_DETACHED;
1650 else if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1651 find_pfxlist_reachable_router(pr) != NULL)
1652 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1655 /* there is no prefix that has a reachable router */
1656 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1657 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1658 pr->ndpr_raf_onlink == 0 ||
1659 pr->ndpr_raf_auto == 0)
1661 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1666 * Remove each interface route associated with a (just) detached
1667 * prefix, and reinstall the interface route for a (just) attached
1668 * prefix. Note that all attempt of reinstallation does not
1669 * necessarily success, when a same prefix is shared among multiple
1670 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1671 * so we don't have to care about them.
1674 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1675 char ip6buf[INET6_ADDRSTRLEN];
1678 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1679 pr->ndpr_raf_onlink == 0 ||
1680 pr->ndpr_raf_auto == 0)
1683 flags = pr->ndpr_stateflags & (NDPRF_DETACHED | NDPRF_ONLINK);
1684 if (flags == 0 || flags == (NDPRF_DETACHED | NDPRF_ONLINK)) {
1685 genid = V_nd6_list_genid;
1687 if ((flags & NDPRF_ONLINK) != 0 &&
1688 (e = nd6_prefix_offlink(pr)) != 0) {
1690 "pfxlist_onlink_check: failed to "
1691 "make %s/%d offlink, errno=%d\n",
1693 &pr->ndpr_prefix.sin6_addr),
1695 } else if ((flags & NDPRF_ONLINK) == 0 &&
1696 (e = nd6_prefix_onlink(pr)) != 0) {
1698 "pfxlist_onlink_check: failed to "
1699 "make %s/%d onlink, errno=%d\n",
1701 &pr->ndpr_prefix.sin6_addr),
1705 if (genid != V_nd6_list_genid)
1711 * Changes on the prefix status might affect address status as well.
1712 * Make sure that all addresses derived from an attached prefix are
1713 * attached, and that all addresses derived from a detached prefix are
1714 * detached. Note, however, that a manually configured address should
1715 * always be attached.
1716 * The precise detection logic is same as the one for prefixes.
1718 IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1719 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1720 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1723 if (ifa->ia6_ndpr == NULL) {
1725 * This can happen when we first configure the address
1726 * (i.e. the address exists, but the prefix does not).
1727 * XXX: complicated relationships...
1732 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1736 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1737 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1740 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1743 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) {
1744 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1745 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1746 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1747 nd6_dad_start((struct ifaddr *)ifa, 0);
1750 ifa->ia6_flags |= IN6_IFF_DETACHED;
1754 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1755 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1758 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1759 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1760 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1761 /* Do we need a delay in this case? */
1762 nd6_dad_start((struct ifaddr *)ifa, 0);
1766 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1768 ND6_ONLINK_UNLOCK();
1772 nd6_prefix_onlink_rtrequest(struct nd_prefix *pr, struct ifaddr *ifa)
1774 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
1775 struct rib_head *rnh;
1777 struct sockaddr_in6 mask6;
1779 int error, a_failure, fibnum, maxfib;
1782 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1783 * ifa->ifa_rtrequest = nd6_rtrequest;
1785 bzero(&mask6, sizeof(mask6));
1786 mask6.sin6_len = sizeof(mask6);
1787 mask6.sin6_addr = pr->ndpr_mask;
1788 rtflags = (ifa->ifa_flags & ~IFA_RTSELF) | RTF_UP;
1790 if(V_rt_add_addr_allfibs) {
1792 maxfib = rt_numfibs;
1794 fibnum = ifa->ifa_ifp->if_fib;
1795 maxfib = fibnum + 1;
1798 for (; fibnum < maxfib; fibnum++) {
1801 error = in6_rtrequest(RTM_ADD,
1802 (struct sockaddr *)&pr->ndpr_prefix, ifa->ifa_addr,
1803 (struct sockaddr *)&mask6, rtflags, &rt, fibnum);
1805 KASSERT(rt != NULL, ("%s: in6_rtrequest return no "
1806 "error(%d) but rt is NULL, pr=%p, ifa=%p", __func__,
1809 rnh = rt_tables_get_rnh(rt->rt_fibnum, AF_INET6);
1810 /* XXX what if rhn == NULL? */
1813 if (rt_setgate(rt, rt_key(rt),
1814 (struct sockaddr *)&null_sdl) == 0) {
1815 struct sockaddr_dl *dl;
1817 dl = (struct sockaddr_dl *)rt->rt_gateway;
1818 dl->sdl_type = rt->rt_ifp->if_type;
1819 dl->sdl_index = rt->rt_ifp->if_index;
1822 nd6_rtmsg(RTM_ADD, rt);
1824 pr->ndpr_stateflags |= NDPRF_ONLINK;
1826 char ip6buf[INET6_ADDRSTRLEN];
1827 char ip6bufg[INET6_ADDRSTRLEN];
1828 char ip6bufm[INET6_ADDRSTRLEN];
1829 struct sockaddr_in6 *sin6;
1831 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
1832 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add "
1833 "route for a prefix (%s/%d) on %s, gw=%s, mask=%s, "
1834 "flags=%lx errno = %d\n",
1835 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1836 pr->ndpr_plen, if_name(pr->ndpr_ifp),
1837 ip6_sprintf(ip6bufg, &sin6->sin6_addr),
1838 ip6_sprintf(ip6bufm, &mask6.sin6_addr),
1841 /* Save last error to return, see rtinit(). */
1852 /* Return the last error we got. */
1857 nd6_prefix_onlink(struct nd_prefix *pr)
1860 struct ifnet *ifp = pr->ndpr_ifp;
1861 struct nd_prefix *opr;
1862 char ip6buf[INET6_ADDRSTRLEN];
1865 ND6_ONLINK_LOCK_ASSERT();
1866 ND6_UNLOCK_ASSERT();
1868 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0)
1872 * Add the interface route associated with the prefix. Before
1873 * installing the route, check if there's the same prefix on another
1874 * interface, and the prefix has already installed the interface route.
1875 * Although such a configuration is expected to be rare, we explicitly
1879 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
1883 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
1886 if (!V_rt_add_addr_allfibs &&
1887 opr->ndpr_ifp->if_fib != pr->ndpr_ifp->if_fib)
1890 if (opr->ndpr_plen == pr->ndpr_plen &&
1891 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1892 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
1900 * We prefer link-local addresses as the associated interface address.
1902 /* search for a link-local addr */
1903 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
1904 IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
1906 /* XXX: freebsd does not have ifa_ifwithaf */
1908 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1909 if (ifa->ifa_addr->sa_family == AF_INET6) {
1914 IF_ADDR_RUNLOCK(ifp);
1915 /* should we care about ia6_flags? */
1919 * This can still happen, when, for example, we receive an RA
1920 * containing a prefix with the L bit set and the A bit clear,
1921 * after removing all IPv6 addresses on the receiving
1922 * interface. This should, of course, be rare though.
1925 "nd6_prefix_onlink: failed to find any ifaddr"
1926 " to add route for a prefix(%s/%d) on %s\n",
1927 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1928 pr->ndpr_plen, if_name(ifp)));
1932 error = nd6_prefix_onlink_rtrequest(pr, ifa);
1941 nd6_prefix_offlink(struct nd_prefix *pr)
1944 struct ifnet *ifp = pr->ndpr_ifp;
1945 struct nd_prefix *opr;
1946 struct sockaddr_in6 sa6, mask6;
1948 char ip6buf[INET6_ADDRSTRLEN];
1950 int fibnum, maxfib, a_failure;
1952 ND6_ONLINK_LOCK_ASSERT();
1953 ND6_UNLOCK_ASSERT();
1955 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0)
1958 bzero(&sa6, sizeof(sa6));
1959 sa6.sin6_family = AF_INET6;
1960 sa6.sin6_len = sizeof(sa6);
1961 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
1962 sizeof(struct in6_addr));
1963 bzero(&mask6, sizeof(mask6));
1964 mask6.sin6_family = AF_INET6;
1965 mask6.sin6_len = sizeof(sa6);
1966 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
1968 if (V_rt_add_addr_allfibs) {
1970 maxfib = rt_numfibs;
1972 fibnum = ifp->if_fib;
1973 maxfib = fibnum + 1;
1977 for (; fibnum < maxfib; fibnum++) {
1979 error = in6_rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
1980 (struct sockaddr *)&mask6, 0, &rt, fibnum);
1982 /* report the route deletion to the routing socket. */
1984 nd6_rtmsg(RTM_DELETE, rt);
1986 /* Save last error to return, see rtinit(). */
1996 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
1999 * There might be the same prefix on another interface,
2000 * the prefix which could not be on-link just because we have
2001 * the interface route (see comments in nd6_prefix_onlink).
2002 * If there's one, try to make the prefix on-link on the
2007 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
2009 * KAME specific: detached prefixes should not be
2012 if (opr == pr || (opr->ndpr_stateflags &
2013 (NDPRF_ONLINK | NDPRF_DETACHED)) != 0)
2016 if (opr->ndpr_plen == pr->ndpr_plen &&
2017 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
2018 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
2021 genid = V_nd6_list_genid;
2023 if ((e = nd6_prefix_onlink(opr)) != 0) {
2025 "nd6_prefix_offlink: failed to "
2026 "recover a prefix %s/%d from %s "
2027 "to %s (errno = %d)\n",
2029 &opr->ndpr_prefix.sin6_addr),
2030 opr->ndpr_plen, if_name(ifp),
2031 if_name(opr->ndpr_ifp), e));
2035 if (genid != V_nd6_list_genid)
2041 /* XXX: can we still set the NDPRF_ONLINK flag? */
2043 "nd6_prefix_offlink: failed to delete route: "
2044 "%s/%d on %s (errno = %d)\n",
2045 ip6_sprintf(ip6buf, &sa6.sin6_addr), pr->ndpr_plen,
2046 if_name(ifp), error));
2050 lltable_prefix_free(AF_INET6, (struct sockaddr *)&sa6,
2051 (struct sockaddr *)&mask6, LLE_STATIC);
2056 static struct in6_ifaddr *
2057 in6_ifadd(struct nd_prefixctl *pr, int mcast)
2059 struct ifnet *ifp = pr->ndpr_ifp;
2061 struct in6_aliasreq ifra;
2062 struct in6_ifaddr *ia, *ib;
2064 struct in6_addr mask;
2065 int prefixlen = pr->ndpr_plen;
2067 char ip6buf[INET6_ADDRSTRLEN];
2069 in6_prefixlen2mask(&mask, prefixlen);
2072 * find a link-local address (will be interface ID).
2073 * Is it really mandatory? Theoretically, a global or a site-local
2074 * address can be configured without a link-local address, if we
2075 * have a unique interface identifier...
2077 * it is not mandatory to have a link-local address, we can generate
2078 * interface identifier on the fly. we do this because:
2079 * (1) it should be the easiest way to find interface identifier.
2080 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
2081 * for multiple addresses on a single interface, and possible shortcut
2082 * of DAD. we omitted DAD for this reason in the past.
2083 * (3) a user can prevent autoconfiguration of global address
2084 * by removing link-local address by hand (this is partly because we
2085 * don't have other way to control the use of IPv6 on an interface.
2086 * this has been our design choice - cf. NRL's "ifconfig auto").
2087 * (4) it is easier to manage when an interface has addresses
2088 * with the same interface identifier, than to have multiple addresses
2089 * with different interface identifiers.
2091 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
2093 ib = (struct in6_ifaddr *)ifa;
2097 /* prefixlen + ifidlen must be equal to 128 */
2098 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
2099 if (prefixlen != plen0) {
2101 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
2102 "(prefix=%d ifid=%d)\n",
2103 if_name(ifp), prefixlen, 128 - plen0));
2108 in6_prepare_ifra(&ifra, &pr->ndpr_prefix.sin6_addr, &mask);
2110 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr, &mask);
2112 ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
2113 (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
2114 ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
2115 (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
2116 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
2117 (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
2118 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
2119 (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
2123 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
2124 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
2126 /* XXX: scope zone ID? */
2128 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
2131 * Make sure that we do not have this address already. This should
2132 * usually not happen, but we can still see this case, e.g., if we
2133 * have manually configured the exact address to be configured.
2135 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
2136 &ifra.ifra_addr.sin6_addr);
2139 /* this should be rare enough to make an explicit log */
2140 log(LOG_INFO, "in6_ifadd: %s is already configured\n",
2141 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr));
2146 * Allocate ifaddr structure, link into chain, etc.
2147 * If we are going to create a new address upon receiving a multicasted
2148 * RA, we need to impose a random delay before starting DAD.
2149 * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2]
2153 updateflags |= IN6_IFAUPDATE_DADDELAY;
2154 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) {
2156 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
2157 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr),
2158 if_name(ifp), error));
2159 return (NULL); /* ifaddr must not have been allocated. */
2162 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
2164 * XXXRW: Assumption of non-NULLness here might not be true with
2165 * fine-grained locking -- should we validate it? Or just return
2166 * earlier ifa rather than looking it up again?
2168 return (ia); /* this is always non-NULL and referenced. */
2172 * ia0 - corresponding public address
2175 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay)
2177 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
2178 struct in6_ifaddr *newia;
2179 struct in6_aliasreq ifra;
2181 int trylimit = 3; /* XXX: adhoc value */
2183 u_int32_t randid[2];
2184 time_t vltime0, pltime0;
2186 in6_prepare_ifra(&ifra, &ia0->ia_addr.sin6_addr,
2187 &ia0->ia_prefixmask.sin6_addr);
2189 ifra.ifra_addr = ia0->ia_addr; /* XXX: do we need this ? */
2190 /* clear the old IFID */
2191 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr,
2192 &ifra.ifra_prefixmask.sin6_addr);
2195 if (in6_get_tmpifid(ifp, (u_int8_t *)randid,
2196 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) {
2197 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find a good "
2201 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
2202 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
2203 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
2204 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
2207 * in6_get_tmpifid() quite likely provided a unique interface ID.
2208 * However, we may still have a chance to see collision, because
2209 * there may be a time lag between generation of the ID and generation
2210 * of the address. So, we'll do one more sanity check.
2213 if (in6_localip(&ifra.ifra_addr.sin6_addr) != 0) {
2214 if (trylimit-- > 0) {
2219 /* Give up. Something strange should have happened. */
2220 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to "
2221 "find a unique random IFID\n"));
2226 * The Valid Lifetime is the lower of the Valid Lifetime of the
2227 * public address or TEMP_VALID_LIFETIME.
2228 * The Preferred Lifetime is the lower of the Preferred Lifetime
2229 * of the public address or TEMP_PREFERRED_LIFETIME -
2232 if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
2233 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
2234 (ia0->ia6_lifetime.ia6t_vltime -
2235 (time_uptime - ia0->ia6_updatetime));
2236 if (vltime0 > V_ip6_temp_valid_lifetime)
2237 vltime0 = V_ip6_temp_valid_lifetime;
2239 vltime0 = V_ip6_temp_valid_lifetime;
2240 if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
2241 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
2242 (ia0->ia6_lifetime.ia6t_pltime -
2243 (time_uptime - ia0->ia6_updatetime));
2244 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){
2245 pltime0 = V_ip6_temp_preferred_lifetime -
2246 V_ip6_desync_factor;
2249 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor;
2250 ifra.ifra_lifetime.ia6t_vltime = vltime0;
2251 ifra.ifra_lifetime.ia6t_pltime = pltime0;
2254 * A temporary address is created only if this calculated Preferred
2255 * Lifetime is greater than REGEN_ADVANCE time units.
2257 if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance)
2260 /* XXX: scope zone ID? */
2262 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
2264 /* allocate ifaddr structure, link into chain, etc. */
2267 updateflags |= IN6_IFAUPDATE_DADDELAY;
2268 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0)
2271 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
2272 if (newia == NULL) { /* XXX: can it happen? */
2274 "in6_tmpifadd: ifa update succeeded, but we got "
2276 return (EINVAL); /* XXX */
2278 newia->ia6_ndpr = ia0->ia6_ndpr;
2279 newia->ia6_ndpr->ndpr_addrcnt++;
2280 ifa_free(&newia->ia_ifa);
2283 * A newly added address might affect the status of other addresses.
2284 * XXX: when the temporary address is generated with a new public
2285 * address, the onlink check is redundant. However, it would be safe
2286 * to do the check explicitly everywhere a new address is generated,
2287 * and, in fact, we surely need the check when we create a new
2288 * temporary address due to deprecation of an old temporary address.
2290 pfxlist_onlink_check();
2296 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
2298 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
2299 ndpr->ndpr_preferred = 0;
2301 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime;
2302 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
2303 ndpr->ndpr_expire = 0;
2305 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime;
2311 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
2313 /* init ia6t_expire */
2314 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
2315 lt6->ia6t_expire = 0;
2317 lt6->ia6t_expire = time_uptime;
2318 lt6->ia6t_expire += lt6->ia6t_vltime;
2321 /* init ia6t_preferred */
2322 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
2323 lt6->ia6t_preferred = 0;
2325 lt6->ia6t_preferred = time_uptime;
2326 lt6->ia6t_preferred += lt6->ia6t_pltime;
2331 * Delete all the routing table entries that use the specified gateway.
2332 * XXX: this function causes search through all entries of routing table, so
2333 * it shouldn't be called when acting as a router.
2336 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
2339 /* We'll care only link-local addresses */
2340 if (!IN6_IS_ADDR_LINKLOCAL(gateway))
2343 /* XXX Do we really need to walk any but the default FIB? */
2344 rt_foreach_fib_walk_del(AF_INET6, rt6_deleteroute, (void *)gateway);
2348 rt6_deleteroute(const struct rtentry *rt, void *arg)
2350 #define SIN6(s) ((struct sockaddr_in6 *)s)
2351 struct in6_addr *gate = (struct in6_addr *)arg;
2353 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
2356 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) {
2361 * Do not delete a static route.
2362 * XXX: this seems to be a bit ad-hoc. Should we consider the
2363 * 'cloned' bit instead?
2365 if ((rt->rt_flags & RTF_STATIC) != 0)
2369 * We delete only host route. This means, in particular, we don't
2370 * delete default route.
2372 if ((rt->rt_flags & RTF_HOST) == 0)
2380 nd6_setdefaultiface(int ifindex)
2384 if (ifindex < 0 || V_if_index < ifindex)
2386 if (ifindex != 0 && !ifnet_byindex(ifindex))
2389 if (V_nd6_defifindex != ifindex) {
2390 V_nd6_defifindex = ifindex;
2391 if (V_nd6_defifindex > 0)
2392 V_nd6_defifp = ifnet_byindex(V_nd6_defifindex);
2394 V_nd6_defifp = NULL;
2397 * Our current implementation assumes one-to-one maping between
2398 * interfaces and links, so it would be natural to use the
2399 * default interface as the default link.
2401 scope6_setdefault(V_nd6_defifp);