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 VNET_DEFINE_STATIC(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);
209 * An initial update routine for draft-ietf-6man-ipv6only-flag.
210 * We need to iterate over all default routers for the given
211 * interface to see whether they are all advertising the "6"
212 * (IPv6-Only) flag. If they do set, otherwise unset, the
213 * interface flag we later use to filter on.
216 defrtr_ipv6_only_ifp(struct ifnet *ifp)
218 struct nd_defrouter *dr;
223 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry)
224 if (dr->ifp == ifp &&
225 (dr->raflags & ND_RA_FLAG_IPV6_ONLY) == 0)
229 IF_AFDATA_WLOCK(ifp);
231 ND_IFINFO(ifp)->flags |= ND6_IFF_IPV6_ONLY;
233 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IPV6_ONLY;
234 IF_AFDATA_WUNLOCK(ifp);
239 * Receive Router Advertisement Message.
242 * TODO: on-link bit on prefix information
243 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
246 nd6_ra_input(struct mbuf *m, int off, int icmp6len)
248 struct ifnet *ifp = m->m_pkthdr.rcvif;
249 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
250 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
251 struct nd_router_advert *nd_ra;
252 struct in6_addr saddr6 = ip6->ip6_src;
254 union nd_opts ndopts;
255 struct nd_defrouter *dr;
256 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
261 * We only accept RAs only when the per-interface flag
262 * ND6_IFF_ACCEPT_RTADV is on the receiving interface.
264 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
267 /* RFC 6980: Nodes MUST silently ignore fragments */
268 if(m->m_flags & M_FRAGMENTED)
271 if (ip6->ip6_hlim != 255) {
273 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
274 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
275 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
279 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
281 "nd6_ra_input: src %s is not link-local\n",
282 ip6_sprintf(ip6bufs, &saddr6)));
286 #ifndef PULLDOWN_TEST
287 IP6_EXTHDR_CHECK(m, off, icmp6len,);
288 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
290 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
292 ICMP6STAT_INC(icp6s_tooshort);
297 icmp6len -= sizeof(*nd_ra);
298 nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
299 if (nd6_options(&ndopts) < 0) {
301 "nd6_ra_input: invalid ND option, ignored\n"));
302 /* nd6_options have incremented stats */
307 struct nd_defrouter dr0;
308 u_int32_t advreachable = nd_ra->nd_ra_reachable;
310 /* remember if this is a multicasted advertisement */
311 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
314 bzero(&dr0, sizeof(dr0));
316 dr0.raflags = nd_ra->nd_ra_flags_reserved;
318 * Effectively-disable routes from RA messages when
319 * ND6_IFF_NO_RADR enabled on the receiving interface or
320 * (ip6.forwarding == 1 && ip6.rfc6204w3 != 1).
322 if (ndi->flags & ND6_IFF_NO_RADR)
324 else if (V_ip6_forwarding && !V_ip6_rfc6204w3)
327 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
328 dr0.expire = time_uptime + dr0.rtlifetime;
330 /* unspecified or not? (RFC 2461 6.3.4) */
332 advreachable = ntohl(advreachable);
333 if (advreachable <= MAX_REACHABLE_TIME &&
334 ndi->basereachable != advreachable) {
335 ndi->basereachable = advreachable;
336 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
337 ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */
340 if (nd_ra->nd_ra_retransmit)
341 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
342 if (nd_ra->nd_ra_curhoplimit) {
343 if (ndi->chlim < nd_ra->nd_ra_curhoplimit)
344 ndi->chlim = nd_ra->nd_ra_curhoplimit;
345 else if (ndi->chlim != nd_ra->nd_ra_curhoplimit) {
346 log(LOG_ERR, "RA with a lower CurHopLimit sent from "
347 "%s on %s (current = %d, received = %d). "
348 "Ignored.\n", ip6_sprintf(ip6bufs, &ip6->ip6_src),
349 if_name(ifp), ndi->chlim, nd_ra->nd_ra_curhoplimit);
352 dr = defrtrlist_update(&dr0);
354 defrtr_ipv6_only_ifp(ifp);
361 if (ndopts.nd_opts_pi) {
362 struct nd_opt_hdr *pt;
363 struct nd_opt_prefix_info *pi = NULL;
364 struct nd_prefixctl pr;
366 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
367 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
368 pt = (struct nd_opt_hdr *)((caddr_t)pt +
369 (pt->nd_opt_len << 3))) {
370 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
372 pi = (struct nd_opt_prefix_info *)pt;
374 if (pi->nd_opt_pi_len != 4) {
376 "nd6_ra_input: invalid option "
377 "len %d for prefix information option, "
378 "ignored\n", pi->nd_opt_pi_len));
382 if (128 < pi->nd_opt_pi_prefix_len) {
384 "nd6_ra_input: invalid prefix "
385 "len %d for prefix information option, "
386 "ignored\n", pi->nd_opt_pi_prefix_len));
390 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
391 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
393 "nd6_ra_input: invalid prefix "
396 &pi->nd_opt_pi_prefix)));
400 bzero(&pr, sizeof(pr));
401 pr.ndpr_prefix.sin6_family = AF_INET6;
402 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
403 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
404 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
406 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
407 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
408 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
409 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
410 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
411 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
412 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
413 (void)prelist_update(&pr, dr, m, mcast);
424 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
428 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
431 if (mtu < IPV6_MMTU) {
432 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
433 "mtu=%lu sent from %s, ignoring\n",
434 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src)));
439 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
440 ? ndi->maxmtu : ifp->if_mtu;
442 int change = (ndi->linkmtu != mtu);
446 /* in6_maxmtu may change */
451 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
452 "mtu=%lu sent from %s; "
453 "exceeds maxmtu %lu, ignoring\n",
454 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu));
461 * Source link layer address
467 if (ndopts.nd_opts_src_lladdr) {
468 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
469 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
472 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
474 "nd6_ra_input: lladdrlen mismatch for %s "
475 "(if %d, RA packet %d)\n", ip6_sprintf(ip6bufs, &saddr6),
476 ifp->if_addrlen, lladdrlen - 2));
480 nd6_cache_lladdr(ifp, &saddr6, lladdr,
481 lladdrlen, ND_ROUTER_ADVERT, 0);
484 * Installing a link-layer address might change the state of the
485 * router's neighbor cache, which might also affect our on-link
486 * detection of adveritsed prefixes.
488 pfxlist_onlink_check();
496 ICMP6STAT_INC(icp6s_badra);
500 /* tell the change to user processes watching the routing socket. */
502 nd6_rtmsg(int cmd, struct rtentry *rt)
504 struct rt_addrinfo info;
508 bzero((caddr_t)&info, sizeof(info));
509 info.rti_info[RTAX_DST] = rt_key(rt);
510 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
511 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
514 struct epoch_tracker et;
517 ifa = CK_STAILQ_FIRST(&ifp->if_addrhead);
518 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
521 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
525 rt_missmsg_fib(cmd, &info, rt->rt_flags, 0, rt->rt_fibnum);
531 * default router list processing sub routines
535 defrouter_addreq(struct nd_defrouter *new)
537 struct sockaddr_in6 def, mask, gate;
538 struct rtentry *newrt = NULL;
541 bzero(&def, sizeof(def));
542 bzero(&mask, sizeof(mask));
543 bzero(&gate, sizeof(gate));
545 def.sin6_len = mask.sin6_len = gate.sin6_len =
546 sizeof(struct sockaddr_in6);
547 def.sin6_family = gate.sin6_family = AF_INET6;
548 gate.sin6_addr = new->rtaddr;
550 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&def,
551 (struct sockaddr *)&gate, (struct sockaddr *)&mask,
552 RTF_GATEWAY, &newrt, new->ifp->if_fib);
554 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
561 struct nd_defrouter *
562 defrouter_lookup_locked(struct in6_addr *addr, struct ifnet *ifp)
564 struct nd_defrouter *dr;
567 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry)
568 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) {
575 struct nd_defrouter *
576 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
578 struct nd_defrouter *dr;
581 dr = defrouter_lookup_locked(addr, ifp);
587 defrouter_ref(struct nd_defrouter *dr)
590 refcount_acquire(&dr->refcnt);
594 defrouter_rele(struct nd_defrouter *dr)
597 if (refcount_release(&dr->refcnt))
602 * Remove the default route for a given router.
603 * This is just a subroutine function for defrouter_select_fib(), and
604 * should not be called from anywhere else.
607 defrouter_delreq(struct nd_defrouter *dr)
609 struct sockaddr_in6 def, mask, gate;
610 struct rtentry *oldrt = NULL;
612 bzero(&def, sizeof(def));
613 bzero(&mask, sizeof(mask));
614 bzero(&gate, sizeof(gate));
616 def.sin6_len = mask.sin6_len = gate.sin6_len =
617 sizeof(struct sockaddr_in6);
618 def.sin6_family = gate.sin6_family = AF_INET6;
619 gate.sin6_addr = dr->rtaddr;
621 in6_rtrequest(RTM_DELETE, (struct sockaddr *)&def,
622 (struct sockaddr *)&gate,
623 (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt, dr->ifp->if_fib);
625 nd6_rtmsg(RTM_DELETE, oldrt);
633 * Remove all default routes from default router list.
636 defrouter_reset(void)
638 struct nd_defrouter *dr, **dra;
644 * We can't delete routes with the ND lock held, so make a copy of the
645 * current default router list and use that when deleting routes.
648 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry)
652 dra = malloc(count * sizeof(*dra), M_TEMP, M_WAITOK | M_ZERO);
655 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
663 for (i = 0; i < count && dra[i] != NULL; i++) {
664 defrouter_delreq(dra[i]);
665 defrouter_rele(dra[i]);
670 * XXX should we also nuke any default routers in the kernel, by
671 * going through them by rtalloc1()?
676 * Look up a matching default router list entry and remove it. Returns true if a
677 * matching entry was found, false otherwise.
680 defrouter_remove(struct in6_addr *addr, struct ifnet *ifp)
682 struct nd_defrouter *dr;
685 dr = defrouter_lookup_locked(addr, ifp);
691 defrouter_unlink(dr, NULL);
699 * Remove a router from the global list and optionally stash it in a
700 * caller-supplied queue.
702 * The ND lock must be held.
705 defrouter_unlink(struct nd_defrouter *dr, struct nd_drhead *drq)
709 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
712 TAILQ_INSERT_TAIL(drq, dr, dr_entry);
716 defrouter_del(struct nd_defrouter *dr)
718 struct nd_defrouter *deldr = NULL;
719 struct nd_prefix *pr;
720 struct nd_pfxrouter *pfxrtr;
725 * Flush all the routing table entries that use the router
728 if (ND_IFINFO(dr->ifp)->flags & ND6_IFF_ACCEPT_RTADV)
729 rt6_flush(&dr->rtaddr, dr->ifp);
732 defrtr_ipv6_only_ifp(dr->ifp);
737 defrouter_delreq(dr);
741 * Also delete all the pointers to the router in each prefix lists.
744 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
745 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
750 pfxlist_onlink_check();
753 * If the router is the primary one, choose a new one.
754 * Note that defrouter_select_fib() will remove the current
755 * gateway from the routing table.
758 defrouter_select_fib(deldr->ifp->if_fib);
761 * Release the list reference.
767 * Default Router Selection according to Section 6.3.6 of RFC 2461 and
768 * draft-ietf-ipngwg-router-selection:
769 * 1) Routers that are reachable or probably reachable should be preferred.
770 * If we have more than one (probably) reachable router, prefer ones
771 * with the highest router preference.
772 * 2) When no routers on the list are known to be reachable or
773 * probably reachable, routers SHOULD be selected in a round-robin
774 * fashion, regardless of router preference values.
775 * 3) If the Default Router List is empty, assume that all
776 * destinations are on-link.
778 * We assume nd_defrouter is sorted by router preference value.
779 * Since the code below covers both with and without router preference cases,
780 * we do not need to classify the cases by ifdef.
782 * At this moment, we do not try to install more than one default router,
783 * even when the multipath routing is available, because we're not sure about
784 * the benefits for stub hosts comparing to the risk of making the code
785 * complicated and the possibility of introducing bugs.
787 * We maintain a single list of routers for multiple FIBs, only considering one
788 * at a time based on the receiving interface's FIB. If @fibnum is RT_ALL_FIBS,
789 * we do the whole thing multiple times.
792 defrouter_select_fib(int fibnum)
794 struct epoch_tracker et;
795 struct nd_defrouter *dr, *selected_dr, *installed_dr;
796 struct llentry *ln = NULL;
798 if (fibnum == RT_ALL_FIBS) {
799 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
800 defrouter_select_fib(fibnum);
806 * Let's handle easy case (3) first:
807 * If default router list is empty, there's nothing to be done.
809 if (TAILQ_EMPTY(&V_nd_defrouter)) {
815 * Search for a (probably) reachable router from the list.
816 * We just pick up the first reachable one (if any), assuming that
817 * the ordering rule of the list described in defrtrlist_update().
819 selected_dr = installed_dr = NULL;
820 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
822 if (selected_dr == NULL && dr->ifp->if_fib == fibnum &&
823 (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
824 ND6_IS_LLINFO_PROBREACH(ln)) {
826 defrouter_ref(selected_dr);
834 if (dr->installed && dr->ifp->if_fib == fibnum) {
835 if (installed_dr == NULL) {
837 defrouter_ref(installed_dr);
840 * this should not happen.
841 * warn for diagnosis.
843 log(LOG_ERR, "defrouter_select_fib: more than "
844 "one router is installed\n");
849 * If none of the default routers was found to be reachable,
850 * round-robin the list regardless of preference.
851 * Otherwise, if we have an installed router, check if the selected
852 * (reachable) router should really be preferred to the installed one.
853 * We only prefer the new router when the old one is not reachable
854 * or when the new one has a really higher preference value.
856 if (selected_dr == NULL) {
857 if (installed_dr == NULL ||
858 TAILQ_NEXT(installed_dr, dr_entry) == NULL)
859 dr = TAILQ_FIRST(&V_nd_defrouter);
861 dr = TAILQ_NEXT(installed_dr, dr_entry);
863 /* Ensure we select a router for this FIB. */
864 TAILQ_FOREACH_FROM(dr, &V_nd_defrouter, dr_entry) {
865 if (dr->ifp->if_fib == fibnum) {
867 defrouter_ref(selected_dr);
871 } else if (installed_dr != NULL) {
873 if ((ln = nd6_lookup(&installed_dr->rtaddr, 0,
874 installed_dr->ifp)) &&
875 ND6_IS_LLINFO_PROBREACH(ln) &&
876 installed_dr->ifp->if_fib == fibnum &&
877 rtpref(selected_dr) <= rtpref(installed_dr)) {
878 defrouter_rele(selected_dr);
879 selected_dr = installed_dr;
888 * If we selected a router for this FIB and it's different
889 * than the installed one, remove the installed router and
890 * install the selected one in its place.
892 if (installed_dr != selected_dr) {
893 if (installed_dr != NULL) {
894 defrouter_delreq(installed_dr);
895 defrouter_rele(installed_dr);
897 if (selected_dr != NULL)
898 defrouter_addreq(selected_dr);
900 if (selected_dr != NULL)
901 defrouter_rele(selected_dr);
905 * Maintain old KPI for default router selection.
906 * If unspecified, we can re-select routers for all FIBs.
909 defrouter_select(void)
911 defrouter_select_fib(RT_ALL_FIBS);
915 * for default router selection
916 * regards router-preference field as a 2-bit signed integer
919 rtpref(struct nd_defrouter *dr)
921 switch (dr->raflags & ND_RA_FLAG_RTPREF_MASK) {
922 case ND_RA_FLAG_RTPREF_HIGH:
923 return (RTPREF_HIGH);
924 case ND_RA_FLAG_RTPREF_MEDIUM:
925 case ND_RA_FLAG_RTPREF_RSV:
926 return (RTPREF_MEDIUM);
927 case ND_RA_FLAG_RTPREF_LOW:
931 * This case should never happen. If it did, it would mean a
932 * serious bug of kernel internal. We thus always bark here.
933 * Or, can we even panic?
935 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->raflags);
936 return (RTPREF_INVALID);
941 static struct nd_defrouter *
942 defrtrlist_update(struct nd_defrouter *new)
944 struct nd_defrouter *dr, *n;
949 if (new->rtlifetime == 0) {
950 defrouter_remove(&new->rtaddr, new->ifp);
957 dr = defrouter_lookup_locked(&new->rtaddr, new->ifp);
959 oldpref = rtpref(dr);
962 dr->raflags = new->raflags; /* XXX flag check */
963 dr->rtlifetime = new->rtlifetime;
964 dr->expire = new->expire;
967 * If the preference does not change, there's no need
968 * to sort the entries. Also make sure the selected
969 * router is still installed in the kernel.
971 if (dr->installed && rtpref(new) == oldpref) {
981 * The router needs to be reinserted into the default router
982 * list, so upgrade to a write lock. If that fails and the list
983 * has potentially changed while the lock was dropped, we'll
984 * redo the lookup with the write lock held.
988 if (!ND6_TRY_UPGRADE()) {
989 genid = V_nd6_list_genid;
992 if (genid != V_nd6_list_genid)
999 * The preferred router may have changed, so relocate this
1002 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
1005 n = malloc(sizeof(*n), M_IP6NDP, M_NOWAIT | M_ZERO);
1010 memcpy(n, new, sizeof(*n));
1011 /* Initialize with an extra reference for the caller. */
1012 refcount_init(&n->refcnt, 2);
1016 * Insert the new router in the Default Router List;
1017 * The Default Router List should be in the descending order
1018 * of router-preferece. Routers with the same preference are
1019 * sorted in the arriving time order.
1022 /* insert at the end of the group */
1023 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
1024 if (rtpref(n) > rtpref(dr))
1028 TAILQ_INSERT_BEFORE(dr, n, dr_entry);
1030 TAILQ_INSERT_TAIL(&V_nd_defrouter, n, dr_entry);
1034 defrouter_select_fib(new->ifp->if_fib);
1039 static struct nd_pfxrouter *
1040 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
1042 struct nd_pfxrouter *search;
1046 LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) {
1047 if (search->router == dr)
1054 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
1056 struct nd_pfxrouter *new;
1059 ND6_UNLOCK_ASSERT();
1062 if (pfxrtr_lookup(pr, dr) != NULL) {
1068 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
1075 if (pfxrtr_lookup(pr, dr) == NULL) {
1076 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
1079 /* We lost a race to add the reference. */
1081 free(new, M_IP6NDP);
1087 pfxlist_onlink_check();
1091 pfxrtr_del(struct nd_pfxrouter *pfr)
1096 LIST_REMOVE(pfr, pfr_entry);
1097 defrouter_rele(pfr->router);
1098 free(pfr, M_IP6NDP);
1101 static struct nd_prefix *
1102 nd6_prefix_lookup_locked(struct nd_prefixctl *key)
1104 struct nd_prefix *search;
1108 LIST_FOREACH(search, &V_nd_prefix, ndpr_entry) {
1109 if (key->ndpr_ifp == search->ndpr_ifp &&
1110 key->ndpr_plen == search->ndpr_plen &&
1111 in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr,
1112 &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) {
1113 nd6_prefix_ref(search);
1121 nd6_prefix_lookup(struct nd_prefixctl *key)
1123 struct nd_prefix *search;
1126 search = nd6_prefix_lookup_locked(key);
1132 nd6_prefix_ref(struct nd_prefix *pr)
1135 refcount_acquire(&pr->ndpr_refcnt);
1139 nd6_prefix_rele(struct nd_prefix *pr)
1142 if (refcount_release(&pr->ndpr_refcnt)) {
1143 KASSERT(LIST_EMPTY(&pr->ndpr_advrtrs),
1144 ("prefix %p has advertising routers", pr));
1150 nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr,
1151 struct nd_prefix **newp)
1153 struct nd_prefix *new;
1154 char ip6buf[INET6_ADDRSTRLEN];
1157 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
1160 refcount_init(&new->ndpr_refcnt, newp != NULL ? 2 : 1);
1161 new->ndpr_ifp = pr->ndpr_ifp;
1162 new->ndpr_prefix = pr->ndpr_prefix;
1163 new->ndpr_plen = pr->ndpr_plen;
1164 new->ndpr_vltime = pr->ndpr_vltime;
1165 new->ndpr_pltime = pr->ndpr_pltime;
1166 new->ndpr_flags = pr->ndpr_flags;
1167 if ((error = in6_init_prefix_ltimes(new)) != 0) {
1168 free(new, M_IP6NDP);
1171 new->ndpr_lastupdate = time_uptime;
1173 /* initialization */
1174 LIST_INIT(&new->ndpr_advrtrs);
1175 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
1176 /* make prefix in the canonical form */
1177 IN6_MASK_ADDR(&new->ndpr_prefix.sin6_addr, &new->ndpr_mask);
1180 LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry);
1184 /* ND_OPT_PI_FLAG_ONLINK processing */
1185 if (new->ndpr_raf_onlink) {
1187 if ((error = nd6_prefix_onlink(new)) != 0) {
1188 nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
1189 "the prefix %s/%d on-link on %s (errno=%d)\n",
1190 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1191 pr->ndpr_plen, if_name(pr->ndpr_ifp), error));
1192 /* proceed anyway. XXX: is it correct? */
1194 ND6_ONLINK_UNLOCK();
1198 pfxrtr_add(new, dr);
1205 * Remove a prefix from the prefix list and optionally stash it in a
1206 * caller-provided list.
1208 * The ND6 lock must be held.
1211 nd6_prefix_unlink(struct nd_prefix *pr, struct nd_prhead *list)
1216 LIST_REMOVE(pr, ndpr_entry);
1219 LIST_INSERT_HEAD(list, pr, ndpr_entry);
1223 * Free an unlinked prefix, first marking it off-link if necessary.
1226 nd6_prefix_del(struct nd_prefix *pr)
1228 struct nd_pfxrouter *pfr, *next;
1230 char ip6buf[INET6_ADDRSTRLEN];
1232 KASSERT(pr->ndpr_addrcnt == 0,
1233 ("prefix %p has referencing addresses", pr));
1234 ND6_UNLOCK_ASSERT();
1237 * Though these flags are now meaningless, we'd rather keep the value
1238 * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users
1239 * when executing "ndp -p".
1241 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1243 if ((e = nd6_prefix_offlink(pr)) != 0) {
1245 "nd6_prefix_del: failed to make %s/%d offlink "
1246 "on %s, errno=%d\n",
1247 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1248 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
1249 /* what should we do? */
1251 ND6_ONLINK_UNLOCK();
1254 /* Release references to routers that have advertised this prefix. */
1256 LIST_FOREACH_SAFE(pfr, &pr->ndpr_advrtrs, pfr_entry, next)
1260 nd6_prefix_rele(pr);
1262 pfxlist_onlink_check();
1266 prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr,
1267 struct mbuf *m, int mcast)
1269 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
1271 struct ifnet *ifp = new->ndpr_ifp;
1272 struct nd_prefix *pr;
1275 struct in6_addrlifetime lt6_tmp;
1276 char ip6buf[INET6_ADDRSTRLEN];
1277 struct epoch_tracker et;
1282 * Authenticity for NA consists authentication for
1283 * both IP header and IP datagrams, doesn't it ?
1285 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
1286 auth = ((m->m_flags & M_AUTHIPHDR) &&
1287 (m->m_flags & M_AUTHIPDGM));
1291 if ((pr = nd6_prefix_lookup(new)) != NULL) {
1293 * nd6_prefix_lookup() ensures that pr and new have the same
1294 * prefix on a same interface.
1298 * Update prefix information. Note that the on-link (L) bit
1299 * and the autonomous (A) bit should NOT be changed from 1
1302 if (new->ndpr_raf_onlink == 1)
1303 pr->ndpr_raf_onlink = 1;
1304 if (new->ndpr_raf_auto == 1)
1305 pr->ndpr_raf_auto = 1;
1306 if (new->ndpr_raf_onlink) {
1307 pr->ndpr_vltime = new->ndpr_vltime;
1308 pr->ndpr_pltime = new->ndpr_pltime;
1309 (void)in6_init_prefix_ltimes(pr); /* XXX error case? */
1310 pr->ndpr_lastupdate = time_uptime;
1313 if (new->ndpr_raf_onlink &&
1314 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1316 if ((error = nd6_prefix_onlink(pr)) != 0) {
1318 "prelist_update: failed to make "
1319 "the prefix %s/%d on-link on %s "
1322 &pr->ndpr_prefix.sin6_addr),
1323 pr->ndpr_plen, if_name(pr->ndpr_ifp),
1325 /* proceed anyway. XXX: is it correct? */
1327 ND6_ONLINK_UNLOCK();
1333 if (new->ndpr_vltime == 0)
1335 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
1338 error = nd6_prelist_add(new, dr, &pr);
1340 nd6log((LOG_NOTICE, "prelist_update: "
1341 "nd6_prelist_add failed for %s/%d on %s errno=%d\n",
1342 ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr),
1343 new->ndpr_plen, if_name(new->ndpr_ifp), error));
1344 goto end; /* we should just give up in this case. */
1348 * XXX: from the ND point of view, we can ignore a prefix
1349 * with the on-link bit being zero. However, we need a
1350 * prefix structure for references from autoconfigured
1351 * addresses. Thus, we explicitly make sure that the prefix
1352 * itself expires now.
1354 if (pr->ndpr_raf_onlink == 0) {
1355 pr->ndpr_vltime = 0;
1356 pr->ndpr_pltime = 0;
1357 in6_init_prefix_ltimes(pr);
1362 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1363 * Note that pr must be non NULL at this point.
1366 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1367 if (!new->ndpr_raf_auto)
1371 * 5.5.3 (b). the link-local prefix should have been ignored in
1375 /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */
1376 if (new->ndpr_pltime > new->ndpr_vltime) {
1377 error = EINVAL; /* XXX: won't be used */
1382 * 5.5.3 (d). If the prefix advertised is not equal to the prefix of
1383 * an address configured by stateless autoconfiguration already in the
1384 * list of addresses associated with the interface, and the Valid
1385 * Lifetime is not 0, form an address. We first check if we have
1386 * a matching prefix.
1387 * Note: we apply a clarification in rfc2462bis-02 here. We only
1388 * consider autoconfigured addresses while RFC2462 simply said
1391 NET_EPOCH_ENTER(et);
1392 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1393 struct in6_ifaddr *ifa6;
1394 u_int32_t remaininglifetime;
1396 if (ifa->ifa_addr->sa_family != AF_INET6)
1399 ifa6 = (struct in6_ifaddr *)ifa;
1402 * We only consider autoconfigured addresses as per rfc2462bis.
1404 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
1408 * Spec is not clear here, but I believe we should concentrate
1409 * on unicast (i.e. not anycast) addresses.
1410 * XXX: other ia6_flags? detached or duplicated?
1412 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
1416 * Ignore the address if it is not associated with a prefix
1417 * or is associated with a prefix that is different from this
1418 * one. (pr is never NULL here)
1420 if (ifa6->ia6_ndpr != pr)
1423 if (ia6_match == NULL) /* remember the first one */
1427 * An already autoconfigured address matched. Now that we
1428 * are sure there is at least one matched address, we can
1429 * proceed to 5.5.3. (e): update the lifetimes according to the
1430 * "two hours" rule and the privacy extension.
1431 * We apply some clarifications in rfc2462bis:
1432 * - use remaininglifetime instead of storedlifetime as a
1434 * - remove the dead code in the "two-hour" rule
1436 #define TWOHOUR (120*60)
1437 lt6_tmp = ifa6->ia6_lifetime;
1439 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1440 remaininglifetime = ND6_INFINITE_LIFETIME;
1441 else if (time_uptime - ifa6->ia6_updatetime >
1442 lt6_tmp.ia6t_vltime) {
1444 * The case of "invalid" address. We should usually
1445 * not see this case.
1447 remaininglifetime = 0;
1449 remaininglifetime = lt6_tmp.ia6t_vltime -
1450 (time_uptime - ifa6->ia6_updatetime);
1452 /* when not updating, keep the current stored lifetime. */
1453 lt6_tmp.ia6t_vltime = remaininglifetime;
1455 if (TWOHOUR < new->ndpr_vltime ||
1456 remaininglifetime < new->ndpr_vltime) {
1457 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1458 } else if (remaininglifetime <= TWOHOUR) {
1460 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1464 * new->ndpr_vltime <= TWOHOUR &&
1465 * TWOHOUR < remaininglifetime
1467 lt6_tmp.ia6t_vltime = TWOHOUR;
1470 /* The 2 hour rule is not imposed for preferred lifetime. */
1471 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1473 in6_init_address_ltimes(pr, <6_tmp);
1476 * We need to treat lifetimes for temporary addresses
1477 * differently, according to
1478 * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1);
1479 * we only update the lifetimes when they are in the maximum
1482 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
1483 u_int32_t maxvltime, maxpltime;
1485 if (V_ip6_temp_valid_lifetime >
1486 (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
1487 V_ip6_desync_factor)) {
1488 maxvltime = V_ip6_temp_valid_lifetime -
1489 (time_uptime - ifa6->ia6_createtime) -
1490 V_ip6_desync_factor;
1493 if (V_ip6_temp_preferred_lifetime >
1494 (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
1495 V_ip6_desync_factor)) {
1496 maxpltime = V_ip6_temp_preferred_lifetime -
1497 (time_uptime - ifa6->ia6_createtime) -
1498 V_ip6_desync_factor;
1502 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME ||
1503 lt6_tmp.ia6t_vltime > maxvltime) {
1504 lt6_tmp.ia6t_vltime = maxvltime;
1506 if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME ||
1507 lt6_tmp.ia6t_pltime > maxpltime) {
1508 lt6_tmp.ia6t_pltime = maxpltime;
1511 ifa6->ia6_lifetime = lt6_tmp;
1512 ifa6->ia6_updatetime = time_uptime;
1515 if (ia6_match == NULL && new->ndpr_vltime) {
1519 * 5.5.3 (d) (continued)
1520 * No address matched and the valid lifetime is non-zero.
1521 * Create a new address.
1525 * Prefix Length check:
1526 * If the sum of the prefix length and interface identifier
1527 * length does not equal 128 bits, the Prefix Information
1528 * option MUST be ignored. The length of the interface
1529 * identifier is defined in a separate link-type specific
1532 ifidlen = in6_if2idlen(ifp);
1534 /* this should not happen, so we always log it. */
1535 log(LOG_ERR, "prelist_update: IFID undefined (%s)\n",
1539 if (ifidlen + pr->ndpr_plen != 128) {
1541 "prelist_update: invalid prefixlen "
1542 "%d for %s, ignored\n",
1543 pr->ndpr_plen, if_name(ifp)));
1547 if ((ia6 = in6_ifadd(new, mcast)) != NULL) {
1549 * note that we should use pr (not new) for reference.
1556 * When a new public address is created as described
1557 * in RFC2462, also create a new temporary address.
1560 * When an interface connects to a new link, a new
1561 * randomized interface identifier should be generated
1562 * immediately together with a new set of temporary
1563 * addresses. Thus, we specifiy 1 as the 2nd arg of
1566 if (V_ip6_use_tempaddr) {
1568 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) {
1569 nd6log((LOG_NOTICE, "prelist_update: "
1570 "failed to create a temporary "
1571 "address, errno=%d\n",
1575 ifa_free(&ia6->ia_ifa);
1578 * A newly added address might affect the status
1579 * of other addresses, so we check and update it.
1580 * XXX: what if address duplication happens?
1582 pfxlist_onlink_check();
1584 /* just set an error. do not bark here. */
1585 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1591 nd6_prefix_rele(pr);
1596 * A supplement function used in the on-link detection below;
1597 * detect if a given prefix has a (probably) reachable advertising router.
1598 * XXX: lengthy function name...
1600 static struct nd_pfxrouter *
1601 find_pfxlist_reachable_router(struct nd_prefix *pr)
1603 struct epoch_tracker et;
1604 struct nd_pfxrouter *pfxrtr;
1610 LIST_FOREACH(pfxrtr, &pr->ndpr_advrtrs, pfr_entry) {
1611 NET_EPOCH_ENTER(et);
1612 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp);
1616 canreach = ND6_IS_LLINFO_PROBREACH(ln);
1625 * Check if each prefix in the prefix list has at least one available router
1626 * that advertised the prefix (a router is "available" if its neighbor cache
1627 * entry is reachable or probably reachable).
1628 * If the check fails, the prefix may be off-link, because, for example,
1629 * we have moved from the network but the lifetime of the prefix has not
1630 * expired yet. So we should not use the prefix if there is another prefix
1631 * that has an available router.
1632 * But, if there is no prefix that has an available router, we still regard
1633 * all the prefixes as on-link. This is because we can't tell if all the
1634 * routers are simply dead or if we really moved from the network and there
1635 * is no router around us.
1638 pfxlist_onlink_check(void)
1640 struct nd_prefix *pr;
1641 struct in6_ifaddr *ifa;
1642 struct nd_defrouter *dr;
1643 struct nd_pfxrouter *pfxrtr = NULL;
1644 struct rm_priotracker in6_ifa_tracker;
1652 * Check if there is a prefix that has a reachable advertising
1655 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1656 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1661 * If we have no such prefix, check whether we still have a router
1662 * that does not advertise any prefixes.
1665 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
1666 struct nd_prefix *pr0;
1668 LIST_FOREACH(pr0, &V_nd_prefix, ndpr_entry) {
1669 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
1676 if (pr != NULL || (!TAILQ_EMPTY(&V_nd_defrouter) && pfxrtr == NULL)) {
1678 * There is at least one prefix that has a reachable router,
1679 * or at least a router which probably does not advertise
1680 * any prefixes. The latter would be the case when we move
1681 * to a new link where we have a router that does not provide
1682 * prefixes and we configure an address by hand.
1683 * Detach prefixes which have no reachable advertising
1684 * router, and attach other prefixes.
1686 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1687 /* XXX: a link-local prefix should never be detached */
1688 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1689 pr->ndpr_raf_onlink == 0 ||
1690 pr->ndpr_raf_auto == 0)
1693 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1694 find_pfxlist_reachable_router(pr) == NULL)
1695 pr->ndpr_stateflags |= NDPRF_DETACHED;
1696 else if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1697 find_pfxlist_reachable_router(pr) != NULL)
1698 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1701 /* there is no prefix that has a reachable router */
1702 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1703 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1704 pr->ndpr_raf_onlink == 0 ||
1705 pr->ndpr_raf_auto == 0)
1707 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1712 * Remove each interface route associated with a (just) detached
1713 * prefix, and reinstall the interface route for a (just) attached
1714 * prefix. Note that all attempt of reinstallation does not
1715 * necessarily success, when a same prefix is shared among multiple
1716 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1717 * so we don't have to care about them.
1720 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1721 char ip6buf[INET6_ADDRSTRLEN];
1724 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1725 pr->ndpr_raf_onlink == 0 ||
1726 pr->ndpr_raf_auto == 0)
1729 flags = pr->ndpr_stateflags & (NDPRF_DETACHED | NDPRF_ONLINK);
1730 if (flags == 0 || flags == (NDPRF_DETACHED | NDPRF_ONLINK)) {
1731 genid = V_nd6_list_genid;
1733 if ((flags & NDPRF_ONLINK) != 0 &&
1734 (e = nd6_prefix_offlink(pr)) != 0) {
1736 "pfxlist_onlink_check: failed to "
1737 "make %s/%d offlink, errno=%d\n",
1739 &pr->ndpr_prefix.sin6_addr),
1741 } else if ((flags & NDPRF_ONLINK) == 0 &&
1742 (e = nd6_prefix_onlink(pr)) != 0) {
1744 "pfxlist_onlink_check: failed to "
1745 "make %s/%d onlink, errno=%d\n",
1747 &pr->ndpr_prefix.sin6_addr),
1751 if (genid != V_nd6_list_genid)
1757 * Changes on the prefix status might affect address status as well.
1758 * Make sure that all addresses derived from an attached prefix are
1759 * attached, and that all addresses derived from a detached prefix are
1760 * detached. Note, however, that a manually configured address should
1761 * always be attached.
1762 * The precise detection logic is same as the one for prefixes.
1764 IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1765 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1766 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1769 if (ifa->ia6_ndpr == NULL) {
1771 * This can happen when we first configure the address
1772 * (i.e. the address exists, but the prefix does not).
1773 * XXX: complicated relationships...
1778 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1782 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1783 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1786 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1789 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) {
1790 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1791 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1792 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1793 nd6_dad_start((struct ifaddr *)ifa, 0);
1796 ifa->ia6_flags |= IN6_IFF_DETACHED;
1800 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1801 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1804 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1805 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1806 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1807 /* Do we need a delay in this case? */
1808 nd6_dad_start((struct ifaddr *)ifa, 0);
1812 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1814 ND6_ONLINK_UNLOCK();
1818 nd6_prefix_onlink_rtrequest(struct nd_prefix *pr, struct ifaddr *ifa)
1820 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
1821 struct rib_head *rnh;
1823 struct sockaddr_in6 mask6;
1825 int error, a_failure, fibnum, maxfib;
1828 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1829 * ifa->ifa_rtrequest = nd6_rtrequest;
1831 bzero(&mask6, sizeof(mask6));
1832 mask6.sin6_len = sizeof(mask6);
1833 mask6.sin6_addr = pr->ndpr_mask;
1834 rtflags = (ifa->ifa_flags & ~IFA_RTSELF) | RTF_UP;
1836 if(V_rt_add_addr_allfibs) {
1838 maxfib = rt_numfibs;
1840 fibnum = ifa->ifa_ifp->if_fib;
1841 maxfib = fibnum + 1;
1844 for (; fibnum < maxfib; fibnum++) {
1847 error = in6_rtrequest(RTM_ADD,
1848 (struct sockaddr *)&pr->ndpr_prefix, ifa->ifa_addr,
1849 (struct sockaddr *)&mask6, rtflags, &rt, fibnum);
1851 KASSERT(rt != NULL, ("%s: in6_rtrequest return no "
1852 "error(%d) but rt is NULL, pr=%p, ifa=%p", __func__,
1855 rnh = rt_tables_get_rnh(rt->rt_fibnum, AF_INET6);
1856 /* XXX what if rhn == NULL? */
1859 if (rt_setgate(rt, rt_key(rt),
1860 (struct sockaddr *)&null_sdl) == 0) {
1861 struct sockaddr_dl *dl;
1863 dl = (struct sockaddr_dl *)rt->rt_gateway;
1864 dl->sdl_type = rt->rt_ifp->if_type;
1865 dl->sdl_index = rt->rt_ifp->if_index;
1868 nd6_rtmsg(RTM_ADD, rt);
1870 pr->ndpr_stateflags |= NDPRF_ONLINK;
1872 char ip6buf[INET6_ADDRSTRLEN];
1873 char ip6bufg[INET6_ADDRSTRLEN];
1874 char ip6bufm[INET6_ADDRSTRLEN];
1875 struct sockaddr_in6 *sin6;
1877 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
1878 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add "
1879 "route for a prefix (%s/%d) on %s, gw=%s, mask=%s, "
1880 "flags=%lx errno = %d\n",
1881 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1882 pr->ndpr_plen, if_name(pr->ndpr_ifp),
1883 ip6_sprintf(ip6bufg, &sin6->sin6_addr),
1884 ip6_sprintf(ip6bufm, &mask6.sin6_addr),
1887 /* Save last error to return, see rtinit(). */
1898 /* Return the last error we got. */
1903 nd6_prefix_onlink(struct nd_prefix *pr)
1906 struct ifnet *ifp = pr->ndpr_ifp;
1907 struct nd_prefix *opr;
1908 char ip6buf[INET6_ADDRSTRLEN];
1911 ND6_ONLINK_LOCK_ASSERT();
1912 ND6_UNLOCK_ASSERT();
1914 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0)
1918 * Add the interface route associated with the prefix. Before
1919 * installing the route, check if there's the same prefix on another
1920 * interface, and the prefix has already installed the interface route.
1921 * Although such a configuration is expected to be rare, we explicitly
1925 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
1929 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
1932 if (!V_rt_add_addr_allfibs &&
1933 opr->ndpr_ifp->if_fib != pr->ndpr_ifp->if_fib)
1936 if (opr->ndpr_plen == pr->ndpr_plen &&
1937 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1938 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
1946 * We prefer link-local addresses as the associated interface address.
1948 /* search for a link-local addr */
1949 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
1950 IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
1952 struct epoch_tracker et;
1954 /* XXX: freebsd does not have ifa_ifwithaf */
1955 NET_EPOCH_ENTER(et);
1956 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1957 if (ifa->ifa_addr->sa_family == AF_INET6) {
1963 /* should we care about ia6_flags? */
1967 * This can still happen, when, for example, we receive an RA
1968 * containing a prefix with the L bit set and the A bit clear,
1969 * after removing all IPv6 addresses on the receiving
1970 * interface. This should, of course, be rare though.
1973 "nd6_prefix_onlink: failed to find any ifaddr"
1974 " to add route for a prefix(%s/%d) on %s\n",
1975 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1976 pr->ndpr_plen, if_name(ifp)));
1980 error = nd6_prefix_onlink_rtrequest(pr, ifa);
1989 nd6_prefix_offlink(struct nd_prefix *pr)
1992 struct ifnet *ifp = pr->ndpr_ifp;
1993 struct nd_prefix *opr;
1994 struct sockaddr_in6 sa6, mask6;
1996 char ip6buf[INET6_ADDRSTRLEN];
1998 int fibnum, maxfib, a_failure;
2000 ND6_ONLINK_LOCK_ASSERT();
2001 ND6_UNLOCK_ASSERT();
2003 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0)
2006 bzero(&sa6, sizeof(sa6));
2007 sa6.sin6_family = AF_INET6;
2008 sa6.sin6_len = sizeof(sa6);
2009 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
2010 sizeof(struct in6_addr));
2011 bzero(&mask6, sizeof(mask6));
2012 mask6.sin6_family = AF_INET6;
2013 mask6.sin6_len = sizeof(sa6);
2014 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
2016 if (V_rt_add_addr_allfibs) {
2018 maxfib = rt_numfibs;
2020 fibnum = ifp->if_fib;
2021 maxfib = fibnum + 1;
2025 for (; fibnum < maxfib; fibnum++) {
2027 error = in6_rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
2028 (struct sockaddr *)&mask6, 0, &rt, fibnum);
2030 /* report the route deletion to the routing socket. */
2032 nd6_rtmsg(RTM_DELETE, rt);
2034 /* Save last error to return, see rtinit(). */
2044 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
2047 * There might be the same prefix on another interface,
2048 * the prefix which could not be on-link just because we have
2049 * the interface route (see comments in nd6_prefix_onlink).
2050 * If there's one, try to make the prefix on-link on the
2055 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
2057 * KAME specific: detached prefixes should not be
2060 if (opr == pr || (opr->ndpr_stateflags &
2061 (NDPRF_ONLINK | NDPRF_DETACHED)) != 0)
2064 if (opr->ndpr_plen == pr->ndpr_plen &&
2065 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
2066 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
2069 genid = V_nd6_list_genid;
2071 if ((e = nd6_prefix_onlink(opr)) != 0) {
2073 "nd6_prefix_offlink: failed to "
2074 "recover a prefix %s/%d from %s "
2075 "to %s (errno = %d)\n",
2077 &opr->ndpr_prefix.sin6_addr),
2078 opr->ndpr_plen, if_name(ifp),
2079 if_name(opr->ndpr_ifp), e));
2083 if (genid != V_nd6_list_genid)
2089 /* XXX: can we still set the NDPRF_ONLINK flag? */
2091 "nd6_prefix_offlink: failed to delete route: "
2092 "%s/%d on %s (errno = %d)\n",
2093 ip6_sprintf(ip6buf, &sa6.sin6_addr), pr->ndpr_plen,
2094 if_name(ifp), error));
2098 lltable_prefix_free(AF_INET6, (struct sockaddr *)&sa6,
2099 (struct sockaddr *)&mask6, LLE_STATIC);
2104 static struct in6_ifaddr *
2105 in6_ifadd(struct nd_prefixctl *pr, int mcast)
2107 struct ifnet *ifp = pr->ndpr_ifp;
2109 struct in6_aliasreq ifra;
2110 struct in6_ifaddr *ia, *ib;
2112 struct in6_addr mask;
2113 int prefixlen = pr->ndpr_plen;
2115 char ip6buf[INET6_ADDRSTRLEN];
2117 in6_prefixlen2mask(&mask, prefixlen);
2120 * find a link-local address (will be interface ID).
2121 * Is it really mandatory? Theoretically, a global or a site-local
2122 * address can be configured without a link-local address, if we
2123 * have a unique interface identifier...
2125 * it is not mandatory to have a link-local address, we can generate
2126 * interface identifier on the fly. we do this because:
2127 * (1) it should be the easiest way to find interface identifier.
2128 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
2129 * for multiple addresses on a single interface, and possible shortcut
2130 * of DAD. we omitted DAD for this reason in the past.
2131 * (3) a user can prevent autoconfiguration of global address
2132 * by removing link-local address by hand (this is partly because we
2133 * don't have other way to control the use of IPv6 on an interface.
2134 * this has been our design choice - cf. NRL's "ifconfig auto").
2135 * (4) it is easier to manage when an interface has addresses
2136 * with the same interface identifier, than to have multiple addresses
2137 * with different interface identifiers.
2139 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
2141 ib = (struct in6_ifaddr *)ifa;
2145 /* prefixlen + ifidlen must be equal to 128 */
2146 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
2147 if (prefixlen != plen0) {
2149 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
2150 "(prefix=%d ifid=%d)\n",
2151 if_name(ifp), prefixlen, 128 - plen0));
2156 in6_prepare_ifra(&ifra, &pr->ndpr_prefix.sin6_addr, &mask);
2158 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr, &mask);
2160 ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
2161 (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
2162 ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
2163 (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
2164 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
2165 (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
2166 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
2167 (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
2171 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
2172 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
2174 /* XXX: scope zone ID? */
2176 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
2179 * Make sure that we do not have this address already. This should
2180 * usually not happen, but we can still see this case, e.g., if we
2181 * have manually configured the exact address to be configured.
2183 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
2184 &ifra.ifra_addr.sin6_addr);
2187 /* this should be rare enough to make an explicit log */
2188 log(LOG_INFO, "in6_ifadd: %s is already configured\n",
2189 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr));
2194 * Allocate ifaddr structure, link into chain, etc.
2195 * If we are going to create a new address upon receiving a multicasted
2196 * RA, we need to impose a random delay before starting DAD.
2197 * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2]
2201 updateflags |= IN6_IFAUPDATE_DADDELAY;
2202 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) {
2204 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
2205 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr),
2206 if_name(ifp), error));
2207 return (NULL); /* ifaddr must not have been allocated. */
2210 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
2212 * XXXRW: Assumption of non-NULLness here might not be true with
2213 * fine-grained locking -- should we validate it? Or just return
2214 * earlier ifa rather than looking it up again?
2216 return (ia); /* this is always non-NULL and referenced. */
2220 * ia0 - corresponding public address
2223 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay)
2225 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
2226 struct in6_ifaddr *newia;
2227 struct in6_aliasreq ifra;
2229 int trylimit = 3; /* XXX: adhoc value */
2231 u_int32_t randid[2];
2232 time_t vltime0, pltime0;
2234 in6_prepare_ifra(&ifra, &ia0->ia_addr.sin6_addr,
2235 &ia0->ia_prefixmask.sin6_addr);
2237 ifra.ifra_addr = ia0->ia_addr; /* XXX: do we need this ? */
2238 /* clear the old IFID */
2239 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr,
2240 &ifra.ifra_prefixmask.sin6_addr);
2243 if (in6_get_tmpifid(ifp, (u_int8_t *)randid,
2244 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) {
2245 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find a good "
2249 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
2250 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
2251 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
2252 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
2255 * in6_get_tmpifid() quite likely provided a unique interface ID.
2256 * However, we may still have a chance to see collision, because
2257 * there may be a time lag between generation of the ID and generation
2258 * of the address. So, we'll do one more sanity check.
2261 if (in6_localip(&ifra.ifra_addr.sin6_addr) != 0) {
2262 if (trylimit-- > 0) {
2267 /* Give up. Something strange should have happened. */
2268 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to "
2269 "find a unique random IFID\n"));
2274 * The Valid Lifetime is the lower of the Valid Lifetime of the
2275 * public address or TEMP_VALID_LIFETIME.
2276 * The Preferred Lifetime is the lower of the Preferred Lifetime
2277 * of the public address or TEMP_PREFERRED_LIFETIME -
2280 if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
2281 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
2282 (ia0->ia6_lifetime.ia6t_vltime -
2283 (time_uptime - ia0->ia6_updatetime));
2284 if (vltime0 > V_ip6_temp_valid_lifetime)
2285 vltime0 = V_ip6_temp_valid_lifetime;
2287 vltime0 = V_ip6_temp_valid_lifetime;
2288 if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
2289 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
2290 (ia0->ia6_lifetime.ia6t_pltime -
2291 (time_uptime - ia0->ia6_updatetime));
2292 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){
2293 pltime0 = V_ip6_temp_preferred_lifetime -
2294 V_ip6_desync_factor;
2297 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor;
2298 ifra.ifra_lifetime.ia6t_vltime = vltime0;
2299 ifra.ifra_lifetime.ia6t_pltime = pltime0;
2302 * A temporary address is created only if this calculated Preferred
2303 * Lifetime is greater than REGEN_ADVANCE time units.
2305 if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance)
2308 /* XXX: scope zone ID? */
2310 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
2312 /* allocate ifaddr structure, link into chain, etc. */
2315 updateflags |= IN6_IFAUPDATE_DADDELAY;
2316 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0)
2319 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
2320 if (newia == NULL) { /* XXX: can it happen? */
2322 "in6_tmpifadd: ifa update succeeded, but we got "
2324 return (EINVAL); /* XXX */
2326 newia->ia6_ndpr = ia0->ia6_ndpr;
2327 newia->ia6_ndpr->ndpr_addrcnt++;
2328 ifa_free(&newia->ia_ifa);
2331 * A newly added address might affect the status of other addresses.
2332 * XXX: when the temporary address is generated with a new public
2333 * address, the onlink check is redundant. However, it would be safe
2334 * to do the check explicitly everywhere a new address is generated,
2335 * and, in fact, we surely need the check when we create a new
2336 * temporary address due to deprecation of an old temporary address.
2338 pfxlist_onlink_check();
2344 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
2346 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
2347 ndpr->ndpr_preferred = 0;
2349 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime;
2350 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
2351 ndpr->ndpr_expire = 0;
2353 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime;
2359 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
2361 /* init ia6t_expire */
2362 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
2363 lt6->ia6t_expire = 0;
2365 lt6->ia6t_expire = time_uptime;
2366 lt6->ia6t_expire += lt6->ia6t_vltime;
2369 /* init ia6t_preferred */
2370 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
2371 lt6->ia6t_preferred = 0;
2373 lt6->ia6t_preferred = time_uptime;
2374 lt6->ia6t_preferred += lt6->ia6t_pltime;
2379 * Delete all the routing table entries that use the specified gateway.
2380 * XXX: this function causes search through all entries of routing table, so
2381 * it shouldn't be called when acting as a router.
2384 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
2387 /* We'll care only link-local addresses */
2388 if (!IN6_IS_ADDR_LINKLOCAL(gateway))
2391 /* XXX Do we really need to walk any but the default FIB? */
2392 rt_foreach_fib_walk_del(AF_INET6, rt6_deleteroute, (void *)gateway);
2396 rt6_deleteroute(const struct rtentry *rt, void *arg)
2398 #define SIN6(s) ((struct sockaddr_in6 *)s)
2399 struct in6_addr *gate = (struct in6_addr *)arg;
2401 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
2404 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) {
2409 * Do not delete a static route.
2410 * XXX: this seems to be a bit ad-hoc. Should we consider the
2411 * 'cloned' bit instead?
2413 if ((rt->rt_flags & RTF_STATIC) != 0)
2417 * We delete only host route. This means, in particular, we don't
2418 * delete default route.
2420 if ((rt->rt_flags & RTF_HOST) == 0)
2428 nd6_setdefaultiface(int ifindex)
2432 if (ifindex < 0 || V_if_index < ifindex)
2434 if (ifindex != 0 && !ifnet_byindex(ifindex))
2437 if (V_nd6_defifindex != ifindex) {
2438 V_nd6_defifindex = ifindex;
2439 if (V_nd6_defifindex > 0)
2440 V_nd6_defifp = ifnet_byindex(V_nd6_defifindex);
2442 V_nd6_defifp = NULL;
2445 * Our current implementation assumes one-to-one maping between
2446 * interfaces and links, so it would be natural to use the
2447 * default interface as the default link.
2449 scope6_setdefault(V_nd6_defifp);