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);
515 ifa = CK_STAILQ_FIRST(&ifp->if_addrhead);
516 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
518 IF_ADDR_RUNLOCK(ifp);
519 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
523 rt_missmsg_fib(cmd, &info, rt->rt_flags, 0, rt->rt_fibnum);
529 * default router list processing sub routines
533 defrouter_addreq(struct nd_defrouter *new)
535 struct sockaddr_in6 def, mask, gate;
536 struct rtentry *newrt = NULL;
539 bzero(&def, sizeof(def));
540 bzero(&mask, sizeof(mask));
541 bzero(&gate, sizeof(gate));
543 def.sin6_len = mask.sin6_len = gate.sin6_len =
544 sizeof(struct sockaddr_in6);
545 def.sin6_family = gate.sin6_family = AF_INET6;
546 gate.sin6_addr = new->rtaddr;
548 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&def,
549 (struct sockaddr *)&gate, (struct sockaddr *)&mask,
550 RTF_GATEWAY, &newrt, new->ifp->if_fib);
552 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
559 struct nd_defrouter *
560 defrouter_lookup_locked(struct in6_addr *addr, struct ifnet *ifp)
562 struct nd_defrouter *dr;
565 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry)
566 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) {
573 struct nd_defrouter *
574 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
576 struct nd_defrouter *dr;
579 dr = defrouter_lookup_locked(addr, ifp);
585 defrouter_ref(struct nd_defrouter *dr)
588 refcount_acquire(&dr->refcnt);
592 defrouter_rele(struct nd_defrouter *dr)
595 if (refcount_release(&dr->refcnt))
600 * Remove the default route for a given router.
601 * This is just a subroutine function for defrouter_select_fib(), and
602 * should not be called from anywhere else.
605 defrouter_delreq(struct nd_defrouter *dr)
607 struct sockaddr_in6 def, mask, gate;
608 struct rtentry *oldrt = NULL;
610 bzero(&def, sizeof(def));
611 bzero(&mask, sizeof(mask));
612 bzero(&gate, sizeof(gate));
614 def.sin6_len = mask.sin6_len = gate.sin6_len =
615 sizeof(struct sockaddr_in6);
616 def.sin6_family = gate.sin6_family = AF_INET6;
617 gate.sin6_addr = dr->rtaddr;
619 in6_rtrequest(RTM_DELETE, (struct sockaddr *)&def,
620 (struct sockaddr *)&gate,
621 (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt, dr->ifp->if_fib);
623 nd6_rtmsg(RTM_DELETE, oldrt);
631 * Remove all default routes from default router list.
634 defrouter_reset(void)
636 struct nd_defrouter *dr, **dra;
642 * We can't delete routes with the ND lock held, so make a copy of the
643 * current default router list and use that when deleting routes.
646 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry)
650 dra = malloc(count * sizeof(*dra), M_TEMP, M_WAITOK | M_ZERO);
653 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
661 for (i = 0; i < count && dra[i] != NULL; i++) {
662 defrouter_delreq(dra[i]);
663 defrouter_rele(dra[i]);
668 * XXX should we also nuke any default routers in the kernel, by
669 * going through them by rtalloc1()?
674 * Look up a matching default router list entry and remove it. Returns true if a
675 * matching entry was found, false otherwise.
678 defrouter_remove(struct in6_addr *addr, struct ifnet *ifp)
680 struct nd_defrouter *dr;
683 dr = defrouter_lookup_locked(addr, ifp);
689 defrouter_unlink(dr, NULL);
697 * Remove a router from the global list and optionally stash it in a
698 * caller-supplied queue.
700 * The ND lock must be held.
703 defrouter_unlink(struct nd_defrouter *dr, struct nd_drhead *drq)
707 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
710 TAILQ_INSERT_TAIL(drq, dr, dr_entry);
714 defrouter_del(struct nd_defrouter *dr)
716 struct nd_defrouter *deldr = NULL;
717 struct nd_prefix *pr;
718 struct nd_pfxrouter *pfxrtr;
723 * Flush all the routing table entries that use the router
726 if (ND_IFINFO(dr->ifp)->flags & ND6_IFF_ACCEPT_RTADV)
727 rt6_flush(&dr->rtaddr, dr->ifp);
730 defrtr_ipv6_only_ifp(dr->ifp);
735 defrouter_delreq(dr);
739 * Also delete all the pointers to the router in each prefix lists.
742 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
743 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
748 pfxlist_onlink_check();
751 * If the router is the primary one, choose a new one.
752 * Note that defrouter_select_fib() will remove the current
753 * gateway from the routing table.
756 defrouter_select_fib(deldr->ifp->if_fib);
759 * Release the list reference.
765 * Default Router Selection according to Section 6.3.6 of RFC 2461 and
766 * draft-ietf-ipngwg-router-selection:
767 * 1) Routers that are reachable or probably reachable should be preferred.
768 * If we have more than one (probably) reachable router, prefer ones
769 * with the highest router preference.
770 * 2) When no routers on the list are known to be reachable or
771 * probably reachable, routers SHOULD be selected in a round-robin
772 * fashion, regardless of router preference values.
773 * 3) If the Default Router List is empty, assume that all
774 * destinations are on-link.
776 * We assume nd_defrouter is sorted by router preference value.
777 * Since the code below covers both with and without router preference cases,
778 * we do not need to classify the cases by ifdef.
780 * At this moment, we do not try to install more than one default router,
781 * even when the multipath routing is available, because we're not sure about
782 * the benefits for stub hosts comparing to the risk of making the code
783 * complicated and the possibility of introducing bugs.
785 * We maintain a single list of routers for multiple FIBs, only considering one
786 * at a time based on the receiving interface's FIB. If @fibnum is RT_ALL_FIBS,
787 * we do the whole thing multiple times.
790 defrouter_select_fib(int fibnum)
792 struct nd_defrouter *dr, *selected_dr, *installed_dr;
793 struct llentry *ln = NULL;
795 if (fibnum == RT_ALL_FIBS) {
796 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
797 defrouter_select_fib(fibnum);
803 * Let's handle easy case (3) first:
804 * If default router list is empty, there's nothing to be done.
806 if (TAILQ_EMPTY(&V_nd_defrouter)) {
812 * Search for a (probably) reachable router from the list.
813 * We just pick up the first reachable one (if any), assuming that
814 * the ordering rule of the list described in defrtrlist_update().
816 selected_dr = installed_dr = NULL;
817 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
818 IF_AFDATA_RLOCK(dr->ifp);
819 if (selected_dr == NULL && dr->ifp->if_fib == fibnum &&
820 (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
821 ND6_IS_LLINFO_PROBREACH(ln)) {
823 defrouter_ref(selected_dr);
825 IF_AFDATA_RUNLOCK(dr->ifp);
831 if (dr->installed && dr->ifp->if_fib == fibnum) {
832 if (installed_dr == NULL) {
834 defrouter_ref(installed_dr);
837 * this should not happen.
838 * warn for diagnosis.
840 log(LOG_ERR, "defrouter_select_fib: more than "
841 "one router is installed\n");
846 * If none of the default routers was found to be reachable,
847 * round-robin the list regardless of preference.
848 * Otherwise, if we have an installed router, check if the selected
849 * (reachable) router should really be preferred to the installed one.
850 * We only prefer the new router when the old one is not reachable
851 * or when the new one has a really higher preference value.
853 if (selected_dr == NULL) {
854 if (installed_dr == NULL ||
855 TAILQ_NEXT(installed_dr, dr_entry) == NULL)
856 dr = TAILQ_FIRST(&V_nd_defrouter);
858 dr = TAILQ_NEXT(installed_dr, dr_entry);
860 /* Ensure we select a router for this FIB. */
861 TAILQ_FOREACH_FROM(dr, &V_nd_defrouter, dr_entry) {
862 if (dr->ifp->if_fib == fibnum) {
864 defrouter_ref(selected_dr);
868 } else if (installed_dr != NULL) {
869 IF_AFDATA_RLOCK(installed_dr->ifp);
870 if ((ln = nd6_lookup(&installed_dr->rtaddr, 0,
871 installed_dr->ifp)) &&
872 ND6_IS_LLINFO_PROBREACH(ln) &&
873 installed_dr->ifp->if_fib == fibnum &&
874 rtpref(selected_dr) <= rtpref(installed_dr)) {
875 defrouter_rele(selected_dr);
876 selected_dr = installed_dr;
878 IF_AFDATA_RUNLOCK(installed_dr->ifp);
885 * If we selected a router for this FIB and it's different
886 * than the installed one, remove the installed router and
887 * install the selected one in its place.
889 if (installed_dr != selected_dr) {
890 if (installed_dr != NULL) {
891 defrouter_delreq(installed_dr);
892 defrouter_rele(installed_dr);
894 if (selected_dr != NULL)
895 defrouter_addreq(selected_dr);
897 if (selected_dr != NULL)
898 defrouter_rele(selected_dr);
902 * Maintain old KPI for default router selection.
903 * If unspecified, we can re-select routers for all FIBs.
906 defrouter_select(void)
908 defrouter_select_fib(RT_ALL_FIBS);
912 * for default router selection
913 * regards router-preference field as a 2-bit signed integer
916 rtpref(struct nd_defrouter *dr)
918 switch (dr->raflags & ND_RA_FLAG_RTPREF_MASK) {
919 case ND_RA_FLAG_RTPREF_HIGH:
920 return (RTPREF_HIGH);
921 case ND_RA_FLAG_RTPREF_MEDIUM:
922 case ND_RA_FLAG_RTPREF_RSV:
923 return (RTPREF_MEDIUM);
924 case ND_RA_FLAG_RTPREF_LOW:
928 * This case should never happen. If it did, it would mean a
929 * serious bug of kernel internal. We thus always bark here.
930 * Or, can we even panic?
932 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->raflags);
933 return (RTPREF_INVALID);
938 static struct nd_defrouter *
939 defrtrlist_update(struct nd_defrouter *new)
941 struct nd_defrouter *dr, *n;
946 if (new->rtlifetime == 0) {
947 defrouter_remove(&new->rtaddr, new->ifp);
954 dr = defrouter_lookup_locked(&new->rtaddr, new->ifp);
956 oldpref = rtpref(dr);
959 dr->raflags = new->raflags; /* XXX flag check */
960 dr->rtlifetime = new->rtlifetime;
961 dr->expire = new->expire;
964 * If the preference does not change, there's no need
965 * to sort the entries. Also make sure the selected
966 * router is still installed in the kernel.
968 if (dr->installed && rtpref(new) == oldpref) {
978 * The router needs to be reinserted into the default router
979 * list, so upgrade to a write lock. If that fails and the list
980 * has potentially changed while the lock was dropped, we'll
981 * redo the lookup with the write lock held.
985 if (!ND6_TRY_UPGRADE()) {
986 genid = V_nd6_list_genid;
989 if (genid != V_nd6_list_genid)
996 * The preferred router may have changed, so relocate this
999 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
1002 n = malloc(sizeof(*n), M_IP6NDP, M_NOWAIT | M_ZERO);
1007 memcpy(n, new, sizeof(*n));
1008 /* Initialize with an extra reference for the caller. */
1009 refcount_init(&n->refcnt, 2);
1013 * Insert the new router in the Default Router List;
1014 * The Default Router List should be in the descending order
1015 * of router-preferece. Routers with the same preference are
1016 * sorted in the arriving time order.
1019 /* insert at the end of the group */
1020 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
1021 if (rtpref(n) > rtpref(dr))
1025 TAILQ_INSERT_BEFORE(dr, n, dr_entry);
1027 TAILQ_INSERT_TAIL(&V_nd_defrouter, n, dr_entry);
1031 defrouter_select_fib(new->ifp->if_fib);
1036 static struct nd_pfxrouter *
1037 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
1039 struct nd_pfxrouter *search;
1043 LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) {
1044 if (search->router == dr)
1051 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
1053 struct nd_pfxrouter *new;
1056 ND6_UNLOCK_ASSERT();
1059 if (pfxrtr_lookup(pr, dr) != NULL) {
1065 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
1072 if (pfxrtr_lookup(pr, dr) == NULL) {
1073 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
1076 /* We lost a race to add the reference. */
1078 free(new, M_IP6NDP);
1084 pfxlist_onlink_check();
1088 pfxrtr_del(struct nd_pfxrouter *pfr)
1093 LIST_REMOVE(pfr, pfr_entry);
1094 defrouter_rele(pfr->router);
1095 free(pfr, M_IP6NDP);
1098 static struct nd_prefix *
1099 nd6_prefix_lookup_locked(struct nd_prefixctl *key)
1101 struct nd_prefix *search;
1105 LIST_FOREACH(search, &V_nd_prefix, ndpr_entry) {
1106 if (key->ndpr_ifp == search->ndpr_ifp &&
1107 key->ndpr_plen == search->ndpr_plen &&
1108 in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr,
1109 &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) {
1110 nd6_prefix_ref(search);
1118 nd6_prefix_lookup(struct nd_prefixctl *key)
1120 struct nd_prefix *search;
1123 search = nd6_prefix_lookup_locked(key);
1129 nd6_prefix_ref(struct nd_prefix *pr)
1132 refcount_acquire(&pr->ndpr_refcnt);
1136 nd6_prefix_rele(struct nd_prefix *pr)
1139 if (refcount_release(&pr->ndpr_refcnt)) {
1140 KASSERT(LIST_EMPTY(&pr->ndpr_advrtrs),
1141 ("prefix %p has advertising routers", pr));
1147 nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr,
1148 struct nd_prefix **newp)
1150 struct nd_prefix *new;
1151 char ip6buf[INET6_ADDRSTRLEN];
1154 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
1157 refcount_init(&new->ndpr_refcnt, newp != NULL ? 2 : 1);
1158 new->ndpr_ifp = pr->ndpr_ifp;
1159 new->ndpr_prefix = pr->ndpr_prefix;
1160 new->ndpr_plen = pr->ndpr_plen;
1161 new->ndpr_vltime = pr->ndpr_vltime;
1162 new->ndpr_pltime = pr->ndpr_pltime;
1163 new->ndpr_flags = pr->ndpr_flags;
1164 if ((error = in6_init_prefix_ltimes(new)) != 0) {
1165 free(new, M_IP6NDP);
1168 new->ndpr_lastupdate = time_uptime;
1170 /* initialization */
1171 LIST_INIT(&new->ndpr_advrtrs);
1172 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
1173 /* make prefix in the canonical form */
1174 IN6_MASK_ADDR(&new->ndpr_prefix.sin6_addr, &new->ndpr_mask);
1177 LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry);
1181 /* ND_OPT_PI_FLAG_ONLINK processing */
1182 if (new->ndpr_raf_onlink) {
1184 if ((error = nd6_prefix_onlink(new)) != 0) {
1185 nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
1186 "the prefix %s/%d on-link on %s (errno=%d)\n",
1187 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1188 pr->ndpr_plen, if_name(pr->ndpr_ifp), error));
1189 /* proceed anyway. XXX: is it correct? */
1191 ND6_ONLINK_UNLOCK();
1195 pfxrtr_add(new, dr);
1202 * Remove a prefix from the prefix list and optionally stash it in a
1203 * caller-provided list.
1205 * The ND6 lock must be held.
1208 nd6_prefix_unlink(struct nd_prefix *pr, struct nd_prhead *list)
1213 LIST_REMOVE(pr, ndpr_entry);
1216 LIST_INSERT_HEAD(list, pr, ndpr_entry);
1220 * Free an unlinked prefix, first marking it off-link if necessary.
1223 nd6_prefix_del(struct nd_prefix *pr)
1225 struct nd_pfxrouter *pfr, *next;
1227 char ip6buf[INET6_ADDRSTRLEN];
1229 KASSERT(pr->ndpr_addrcnt == 0,
1230 ("prefix %p has referencing addresses", pr));
1231 ND6_UNLOCK_ASSERT();
1234 * Though these flags are now meaningless, we'd rather keep the value
1235 * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users
1236 * when executing "ndp -p".
1238 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1240 if ((e = nd6_prefix_offlink(pr)) != 0) {
1242 "nd6_prefix_del: failed to make %s/%d offlink "
1243 "on %s, errno=%d\n",
1244 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1245 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
1246 /* what should we do? */
1248 ND6_ONLINK_UNLOCK();
1251 /* Release references to routers that have advertised this prefix. */
1253 LIST_FOREACH_SAFE(pfr, &pr->ndpr_advrtrs, pfr_entry, next)
1257 nd6_prefix_rele(pr);
1259 pfxlist_onlink_check();
1263 prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr,
1264 struct mbuf *m, int mcast)
1266 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
1268 struct ifnet *ifp = new->ndpr_ifp;
1269 struct nd_prefix *pr;
1272 struct in6_addrlifetime lt6_tmp;
1273 char ip6buf[INET6_ADDRSTRLEN];
1278 * Authenticity for NA consists authentication for
1279 * both IP header and IP datagrams, doesn't it ?
1281 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
1282 auth = ((m->m_flags & M_AUTHIPHDR) &&
1283 (m->m_flags & M_AUTHIPDGM));
1287 if ((pr = nd6_prefix_lookup(new)) != NULL) {
1289 * nd6_prefix_lookup() ensures that pr and new have the same
1290 * prefix on a same interface.
1294 * Update prefix information. Note that the on-link (L) bit
1295 * and the autonomous (A) bit should NOT be changed from 1
1298 if (new->ndpr_raf_onlink == 1)
1299 pr->ndpr_raf_onlink = 1;
1300 if (new->ndpr_raf_auto == 1)
1301 pr->ndpr_raf_auto = 1;
1302 if (new->ndpr_raf_onlink) {
1303 pr->ndpr_vltime = new->ndpr_vltime;
1304 pr->ndpr_pltime = new->ndpr_pltime;
1305 (void)in6_init_prefix_ltimes(pr); /* XXX error case? */
1306 pr->ndpr_lastupdate = time_uptime;
1309 if (new->ndpr_raf_onlink &&
1310 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1312 if ((error = nd6_prefix_onlink(pr)) != 0) {
1314 "prelist_update: failed to make "
1315 "the prefix %s/%d on-link on %s "
1318 &pr->ndpr_prefix.sin6_addr),
1319 pr->ndpr_plen, if_name(pr->ndpr_ifp),
1321 /* proceed anyway. XXX: is it correct? */
1323 ND6_ONLINK_UNLOCK();
1329 if (new->ndpr_vltime == 0)
1331 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
1334 error = nd6_prelist_add(new, dr, &pr);
1336 nd6log((LOG_NOTICE, "prelist_update: "
1337 "nd6_prelist_add failed for %s/%d on %s errno=%d\n",
1338 ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr),
1339 new->ndpr_plen, if_name(new->ndpr_ifp), error));
1340 goto end; /* we should just give up in this case. */
1344 * XXX: from the ND point of view, we can ignore a prefix
1345 * with the on-link bit being zero. However, we need a
1346 * prefix structure for references from autoconfigured
1347 * addresses. Thus, we explicitly make sure that the prefix
1348 * itself expires now.
1350 if (pr->ndpr_raf_onlink == 0) {
1351 pr->ndpr_vltime = 0;
1352 pr->ndpr_pltime = 0;
1353 in6_init_prefix_ltimes(pr);
1358 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1359 * Note that pr must be non NULL at this point.
1362 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1363 if (!new->ndpr_raf_auto)
1367 * 5.5.3 (b). the link-local prefix should have been ignored in
1371 /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */
1372 if (new->ndpr_pltime > new->ndpr_vltime) {
1373 error = EINVAL; /* XXX: won't be used */
1378 * 5.5.3 (d). If the prefix advertised is not equal to the prefix of
1379 * an address configured by stateless autoconfiguration already in the
1380 * list of addresses associated with the interface, and the Valid
1381 * Lifetime is not 0, form an address. We first check if we have
1382 * a matching prefix.
1383 * Note: we apply a clarification in rfc2462bis-02 here. We only
1384 * consider autoconfigured addresses while RFC2462 simply said
1388 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1389 struct in6_ifaddr *ifa6;
1390 u_int32_t remaininglifetime;
1392 if (ifa->ifa_addr->sa_family != AF_INET6)
1395 ifa6 = (struct in6_ifaddr *)ifa;
1398 * We only consider autoconfigured addresses as per rfc2462bis.
1400 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
1404 * Spec is not clear here, but I believe we should concentrate
1405 * on unicast (i.e. not anycast) addresses.
1406 * XXX: other ia6_flags? detached or duplicated?
1408 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
1412 * Ignore the address if it is not associated with a prefix
1413 * or is associated with a prefix that is different from this
1414 * one. (pr is never NULL here)
1416 if (ifa6->ia6_ndpr != pr)
1419 if (ia6_match == NULL) /* remember the first one */
1423 * An already autoconfigured address matched. Now that we
1424 * are sure there is at least one matched address, we can
1425 * proceed to 5.5.3. (e): update the lifetimes according to the
1426 * "two hours" rule and the privacy extension.
1427 * We apply some clarifications in rfc2462bis:
1428 * - use remaininglifetime instead of storedlifetime as a
1430 * - remove the dead code in the "two-hour" rule
1432 #define TWOHOUR (120*60)
1433 lt6_tmp = ifa6->ia6_lifetime;
1435 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1436 remaininglifetime = ND6_INFINITE_LIFETIME;
1437 else if (time_uptime - ifa6->ia6_updatetime >
1438 lt6_tmp.ia6t_vltime) {
1440 * The case of "invalid" address. We should usually
1441 * not see this case.
1443 remaininglifetime = 0;
1445 remaininglifetime = lt6_tmp.ia6t_vltime -
1446 (time_uptime - ifa6->ia6_updatetime);
1448 /* when not updating, keep the current stored lifetime. */
1449 lt6_tmp.ia6t_vltime = remaininglifetime;
1451 if (TWOHOUR < new->ndpr_vltime ||
1452 remaininglifetime < new->ndpr_vltime) {
1453 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1454 } else if (remaininglifetime <= TWOHOUR) {
1456 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1460 * new->ndpr_vltime <= TWOHOUR &&
1461 * TWOHOUR < remaininglifetime
1463 lt6_tmp.ia6t_vltime = TWOHOUR;
1466 /* The 2 hour rule is not imposed for preferred lifetime. */
1467 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1469 in6_init_address_ltimes(pr, <6_tmp);
1472 * We need to treat lifetimes for temporary addresses
1473 * differently, according to
1474 * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1);
1475 * we only update the lifetimes when they are in the maximum
1478 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
1479 u_int32_t maxvltime, maxpltime;
1481 if (V_ip6_temp_valid_lifetime >
1482 (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
1483 V_ip6_desync_factor)) {
1484 maxvltime = V_ip6_temp_valid_lifetime -
1485 (time_uptime - ifa6->ia6_createtime) -
1486 V_ip6_desync_factor;
1489 if (V_ip6_temp_preferred_lifetime >
1490 (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
1491 V_ip6_desync_factor)) {
1492 maxpltime = V_ip6_temp_preferred_lifetime -
1493 (time_uptime - ifa6->ia6_createtime) -
1494 V_ip6_desync_factor;
1498 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME ||
1499 lt6_tmp.ia6t_vltime > maxvltime) {
1500 lt6_tmp.ia6t_vltime = maxvltime;
1502 if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME ||
1503 lt6_tmp.ia6t_pltime > maxpltime) {
1504 lt6_tmp.ia6t_pltime = maxpltime;
1507 ifa6->ia6_lifetime = lt6_tmp;
1508 ifa6->ia6_updatetime = time_uptime;
1510 IF_ADDR_RUNLOCK(ifp);
1511 if (ia6_match == NULL && new->ndpr_vltime) {
1515 * 5.5.3 (d) (continued)
1516 * No address matched and the valid lifetime is non-zero.
1517 * Create a new address.
1521 * Prefix Length check:
1522 * If the sum of the prefix length and interface identifier
1523 * length does not equal 128 bits, the Prefix Information
1524 * option MUST be ignored. The length of the interface
1525 * identifier is defined in a separate link-type specific
1528 ifidlen = in6_if2idlen(ifp);
1530 /* this should not happen, so we always log it. */
1531 log(LOG_ERR, "prelist_update: IFID undefined (%s)\n",
1535 if (ifidlen + pr->ndpr_plen != 128) {
1537 "prelist_update: invalid prefixlen "
1538 "%d for %s, ignored\n",
1539 pr->ndpr_plen, if_name(ifp)));
1543 if ((ia6 = in6_ifadd(new, mcast)) != NULL) {
1545 * note that we should use pr (not new) for reference.
1552 * When a new public address is created as described
1553 * in RFC2462, also create a new temporary address.
1556 * When an interface connects to a new link, a new
1557 * randomized interface identifier should be generated
1558 * immediately together with a new set of temporary
1559 * addresses. Thus, we specifiy 1 as the 2nd arg of
1562 if (V_ip6_use_tempaddr) {
1564 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) {
1565 nd6log((LOG_NOTICE, "prelist_update: "
1566 "failed to create a temporary "
1567 "address, errno=%d\n",
1571 ifa_free(&ia6->ia_ifa);
1574 * A newly added address might affect the status
1575 * of other addresses, so we check and update it.
1576 * XXX: what if address duplication happens?
1578 pfxlist_onlink_check();
1580 /* just set an error. do not bark here. */
1581 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1587 nd6_prefix_rele(pr);
1592 * A supplement function used in the on-link detection below;
1593 * detect if a given prefix has a (probably) reachable advertising router.
1594 * XXX: lengthy function name...
1596 static struct nd_pfxrouter *
1597 find_pfxlist_reachable_router(struct nd_prefix *pr)
1599 struct nd_pfxrouter *pfxrtr;
1605 LIST_FOREACH(pfxrtr, &pr->ndpr_advrtrs, pfr_entry) {
1606 IF_AFDATA_RLOCK(pfxrtr->router->ifp);
1607 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp);
1608 IF_AFDATA_RUNLOCK(pfxrtr->router->ifp);
1611 canreach = ND6_IS_LLINFO_PROBREACH(ln);
1620 * Check if each prefix in the prefix list has at least one available router
1621 * that advertised the prefix (a router is "available" if its neighbor cache
1622 * entry is reachable or probably reachable).
1623 * If the check fails, the prefix may be off-link, because, for example,
1624 * we have moved from the network but the lifetime of the prefix has not
1625 * expired yet. So we should not use the prefix if there is another prefix
1626 * that has an available router.
1627 * But, if there is no prefix that has an available router, we still regard
1628 * all the prefixes as on-link. This is because we can't tell if all the
1629 * routers are simply dead or if we really moved from the network and there
1630 * is no router around us.
1633 pfxlist_onlink_check(void)
1635 struct nd_prefix *pr;
1636 struct in6_ifaddr *ifa;
1637 struct nd_defrouter *dr;
1638 struct nd_pfxrouter *pfxrtr = NULL;
1639 struct rm_priotracker in6_ifa_tracker;
1647 * Check if there is a prefix that has a reachable advertising
1650 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1651 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1656 * If we have no such prefix, check whether we still have a router
1657 * that does not advertise any prefixes.
1660 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
1661 struct nd_prefix *pr0;
1663 LIST_FOREACH(pr0, &V_nd_prefix, ndpr_entry) {
1664 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
1671 if (pr != NULL || (!TAILQ_EMPTY(&V_nd_defrouter) && pfxrtr == NULL)) {
1673 * There is at least one prefix that has a reachable router,
1674 * or at least a router which probably does not advertise
1675 * any prefixes. The latter would be the case when we move
1676 * to a new link where we have a router that does not provide
1677 * prefixes and we configure an address by hand.
1678 * Detach prefixes which have no reachable advertising
1679 * router, and attach other prefixes.
1681 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1682 /* XXX: a link-local prefix should never be detached */
1683 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1684 pr->ndpr_raf_onlink == 0 ||
1685 pr->ndpr_raf_auto == 0)
1688 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1689 find_pfxlist_reachable_router(pr) == NULL)
1690 pr->ndpr_stateflags |= NDPRF_DETACHED;
1691 else if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1692 find_pfxlist_reachable_router(pr) != NULL)
1693 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1696 /* there is no prefix that has a reachable router */
1697 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1698 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1699 pr->ndpr_raf_onlink == 0 ||
1700 pr->ndpr_raf_auto == 0)
1702 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1707 * Remove each interface route associated with a (just) detached
1708 * prefix, and reinstall the interface route for a (just) attached
1709 * prefix. Note that all attempt of reinstallation does not
1710 * necessarily success, when a same prefix is shared among multiple
1711 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1712 * so we don't have to care about them.
1715 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1716 char ip6buf[INET6_ADDRSTRLEN];
1719 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
1720 pr->ndpr_raf_onlink == 0 ||
1721 pr->ndpr_raf_auto == 0)
1724 flags = pr->ndpr_stateflags & (NDPRF_DETACHED | NDPRF_ONLINK);
1725 if (flags == 0 || flags == (NDPRF_DETACHED | NDPRF_ONLINK)) {
1726 genid = V_nd6_list_genid;
1728 if ((flags & NDPRF_ONLINK) != 0 &&
1729 (e = nd6_prefix_offlink(pr)) != 0) {
1731 "pfxlist_onlink_check: failed to "
1732 "make %s/%d offlink, errno=%d\n",
1734 &pr->ndpr_prefix.sin6_addr),
1736 } else if ((flags & NDPRF_ONLINK) == 0 &&
1737 (e = nd6_prefix_onlink(pr)) != 0) {
1739 "pfxlist_onlink_check: failed to "
1740 "make %s/%d onlink, errno=%d\n",
1742 &pr->ndpr_prefix.sin6_addr),
1746 if (genid != V_nd6_list_genid)
1752 * Changes on the prefix status might affect address status as well.
1753 * Make sure that all addresses derived from an attached prefix are
1754 * attached, and that all addresses derived from a detached prefix are
1755 * detached. Note, however, that a manually configured address should
1756 * always be attached.
1757 * The precise detection logic is same as the one for prefixes.
1759 IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1760 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1761 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1764 if (ifa->ia6_ndpr == NULL) {
1766 * This can happen when we first configure the address
1767 * (i.e. the address exists, but the prefix does not).
1768 * XXX: complicated relationships...
1773 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1777 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1778 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1781 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1784 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) {
1785 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1786 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1787 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1788 nd6_dad_start((struct ifaddr *)ifa, 0);
1791 ifa->ia6_flags |= IN6_IFF_DETACHED;
1795 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1796 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1799 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1800 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1801 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1802 /* Do we need a delay in this case? */
1803 nd6_dad_start((struct ifaddr *)ifa, 0);
1807 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1809 ND6_ONLINK_UNLOCK();
1813 nd6_prefix_onlink_rtrequest(struct nd_prefix *pr, struct ifaddr *ifa)
1815 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
1816 struct rib_head *rnh;
1818 struct sockaddr_in6 mask6;
1820 int error, a_failure, fibnum, maxfib;
1823 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1824 * ifa->ifa_rtrequest = nd6_rtrequest;
1826 bzero(&mask6, sizeof(mask6));
1827 mask6.sin6_len = sizeof(mask6);
1828 mask6.sin6_addr = pr->ndpr_mask;
1829 rtflags = (ifa->ifa_flags & ~IFA_RTSELF) | RTF_UP;
1831 if(V_rt_add_addr_allfibs) {
1833 maxfib = rt_numfibs;
1835 fibnum = ifa->ifa_ifp->if_fib;
1836 maxfib = fibnum + 1;
1839 for (; fibnum < maxfib; fibnum++) {
1842 error = in6_rtrequest(RTM_ADD,
1843 (struct sockaddr *)&pr->ndpr_prefix, ifa->ifa_addr,
1844 (struct sockaddr *)&mask6, rtflags, &rt, fibnum);
1846 KASSERT(rt != NULL, ("%s: in6_rtrequest return no "
1847 "error(%d) but rt is NULL, pr=%p, ifa=%p", __func__,
1850 rnh = rt_tables_get_rnh(rt->rt_fibnum, AF_INET6);
1851 /* XXX what if rhn == NULL? */
1854 if (rt_setgate(rt, rt_key(rt),
1855 (struct sockaddr *)&null_sdl) == 0) {
1856 struct sockaddr_dl *dl;
1858 dl = (struct sockaddr_dl *)rt->rt_gateway;
1859 dl->sdl_type = rt->rt_ifp->if_type;
1860 dl->sdl_index = rt->rt_ifp->if_index;
1863 nd6_rtmsg(RTM_ADD, rt);
1865 pr->ndpr_stateflags |= NDPRF_ONLINK;
1867 char ip6buf[INET6_ADDRSTRLEN];
1868 char ip6bufg[INET6_ADDRSTRLEN];
1869 char ip6bufm[INET6_ADDRSTRLEN];
1870 struct sockaddr_in6 *sin6;
1872 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
1873 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add "
1874 "route for a prefix (%s/%d) on %s, gw=%s, mask=%s, "
1875 "flags=%lx errno = %d\n",
1876 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1877 pr->ndpr_plen, if_name(pr->ndpr_ifp),
1878 ip6_sprintf(ip6bufg, &sin6->sin6_addr),
1879 ip6_sprintf(ip6bufm, &mask6.sin6_addr),
1882 /* Save last error to return, see rtinit(). */
1893 /* Return the last error we got. */
1898 nd6_prefix_onlink(struct nd_prefix *pr)
1901 struct ifnet *ifp = pr->ndpr_ifp;
1902 struct nd_prefix *opr;
1903 char ip6buf[INET6_ADDRSTRLEN];
1906 ND6_ONLINK_LOCK_ASSERT();
1907 ND6_UNLOCK_ASSERT();
1909 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0)
1913 * Add the interface route associated with the prefix. Before
1914 * installing the route, check if there's the same prefix on another
1915 * interface, and the prefix has already installed the interface route.
1916 * Although such a configuration is expected to be rare, we explicitly
1920 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
1924 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
1927 if (!V_rt_add_addr_allfibs &&
1928 opr->ndpr_ifp->if_fib != pr->ndpr_ifp->if_fib)
1931 if (opr->ndpr_plen == pr->ndpr_plen &&
1932 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1933 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
1941 * We prefer link-local addresses as the associated interface address.
1943 /* search for a link-local addr */
1944 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
1945 IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
1947 /* XXX: freebsd does not have ifa_ifwithaf */
1949 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1950 if (ifa->ifa_addr->sa_family == AF_INET6) {
1955 IF_ADDR_RUNLOCK(ifp);
1956 /* should we care about ia6_flags? */
1960 * This can still happen, when, for example, we receive an RA
1961 * containing a prefix with the L bit set and the A bit clear,
1962 * after removing all IPv6 addresses on the receiving
1963 * interface. This should, of course, be rare though.
1966 "nd6_prefix_onlink: failed to find any ifaddr"
1967 " to add route for a prefix(%s/%d) on %s\n",
1968 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1969 pr->ndpr_plen, if_name(ifp)));
1973 error = nd6_prefix_onlink_rtrequest(pr, ifa);
1982 nd6_prefix_offlink(struct nd_prefix *pr)
1985 struct ifnet *ifp = pr->ndpr_ifp;
1986 struct nd_prefix *opr;
1987 struct sockaddr_in6 sa6, mask6;
1989 char ip6buf[INET6_ADDRSTRLEN];
1991 int fibnum, maxfib, a_failure;
1993 ND6_ONLINK_LOCK_ASSERT();
1994 ND6_UNLOCK_ASSERT();
1996 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0)
1999 bzero(&sa6, sizeof(sa6));
2000 sa6.sin6_family = AF_INET6;
2001 sa6.sin6_len = sizeof(sa6);
2002 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
2003 sizeof(struct in6_addr));
2004 bzero(&mask6, sizeof(mask6));
2005 mask6.sin6_family = AF_INET6;
2006 mask6.sin6_len = sizeof(sa6);
2007 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
2009 if (V_rt_add_addr_allfibs) {
2011 maxfib = rt_numfibs;
2013 fibnum = ifp->if_fib;
2014 maxfib = fibnum + 1;
2018 for (; fibnum < maxfib; fibnum++) {
2020 error = in6_rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
2021 (struct sockaddr *)&mask6, 0, &rt, fibnum);
2023 /* report the route deletion to the routing socket. */
2025 nd6_rtmsg(RTM_DELETE, rt);
2027 /* Save last error to return, see rtinit(). */
2037 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
2040 * There might be the same prefix on another interface,
2041 * the prefix which could not be on-link just because we have
2042 * the interface route (see comments in nd6_prefix_onlink).
2043 * If there's one, try to make the prefix on-link on the
2048 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
2050 * KAME specific: detached prefixes should not be
2053 if (opr == pr || (opr->ndpr_stateflags &
2054 (NDPRF_ONLINK | NDPRF_DETACHED)) != 0)
2057 if (opr->ndpr_plen == pr->ndpr_plen &&
2058 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
2059 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
2062 genid = V_nd6_list_genid;
2064 if ((e = nd6_prefix_onlink(opr)) != 0) {
2066 "nd6_prefix_offlink: failed to "
2067 "recover a prefix %s/%d from %s "
2068 "to %s (errno = %d)\n",
2070 &opr->ndpr_prefix.sin6_addr),
2071 opr->ndpr_plen, if_name(ifp),
2072 if_name(opr->ndpr_ifp), e));
2076 if (genid != V_nd6_list_genid)
2082 /* XXX: can we still set the NDPRF_ONLINK flag? */
2084 "nd6_prefix_offlink: failed to delete route: "
2085 "%s/%d on %s (errno = %d)\n",
2086 ip6_sprintf(ip6buf, &sa6.sin6_addr), pr->ndpr_plen,
2087 if_name(ifp), error));
2091 lltable_prefix_free(AF_INET6, (struct sockaddr *)&sa6,
2092 (struct sockaddr *)&mask6, LLE_STATIC);
2097 static struct in6_ifaddr *
2098 in6_ifadd(struct nd_prefixctl *pr, int mcast)
2100 struct ifnet *ifp = pr->ndpr_ifp;
2102 struct in6_aliasreq ifra;
2103 struct in6_ifaddr *ia, *ib;
2105 struct in6_addr mask;
2106 int prefixlen = pr->ndpr_plen;
2108 char ip6buf[INET6_ADDRSTRLEN];
2110 in6_prefixlen2mask(&mask, prefixlen);
2113 * find a link-local address (will be interface ID).
2114 * Is it really mandatory? Theoretically, a global or a site-local
2115 * address can be configured without a link-local address, if we
2116 * have a unique interface identifier...
2118 * it is not mandatory to have a link-local address, we can generate
2119 * interface identifier on the fly. we do this because:
2120 * (1) it should be the easiest way to find interface identifier.
2121 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
2122 * for multiple addresses on a single interface, and possible shortcut
2123 * of DAD. we omitted DAD for this reason in the past.
2124 * (3) a user can prevent autoconfiguration of global address
2125 * by removing link-local address by hand (this is partly because we
2126 * don't have other way to control the use of IPv6 on an interface.
2127 * this has been our design choice - cf. NRL's "ifconfig auto").
2128 * (4) it is easier to manage when an interface has addresses
2129 * with the same interface identifier, than to have multiple addresses
2130 * with different interface identifiers.
2132 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
2134 ib = (struct in6_ifaddr *)ifa;
2138 /* prefixlen + ifidlen must be equal to 128 */
2139 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
2140 if (prefixlen != plen0) {
2142 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
2143 "(prefix=%d ifid=%d)\n",
2144 if_name(ifp), prefixlen, 128 - plen0));
2149 in6_prepare_ifra(&ifra, &pr->ndpr_prefix.sin6_addr, &mask);
2151 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr, &mask);
2153 ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
2154 (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
2155 ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
2156 (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
2157 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
2158 (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
2159 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
2160 (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
2164 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
2165 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
2167 /* XXX: scope zone ID? */
2169 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
2172 * Make sure that we do not have this address already. This should
2173 * usually not happen, but we can still see this case, e.g., if we
2174 * have manually configured the exact address to be configured.
2176 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
2177 &ifra.ifra_addr.sin6_addr);
2180 /* this should be rare enough to make an explicit log */
2181 log(LOG_INFO, "in6_ifadd: %s is already configured\n",
2182 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr));
2187 * Allocate ifaddr structure, link into chain, etc.
2188 * If we are going to create a new address upon receiving a multicasted
2189 * RA, we need to impose a random delay before starting DAD.
2190 * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2]
2194 updateflags |= IN6_IFAUPDATE_DADDELAY;
2195 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) {
2197 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
2198 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr),
2199 if_name(ifp), error));
2200 return (NULL); /* ifaddr must not have been allocated. */
2203 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
2205 * XXXRW: Assumption of non-NULLness here might not be true with
2206 * fine-grained locking -- should we validate it? Or just return
2207 * earlier ifa rather than looking it up again?
2209 return (ia); /* this is always non-NULL and referenced. */
2213 * ia0 - corresponding public address
2216 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay)
2218 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
2219 struct in6_ifaddr *newia;
2220 struct in6_aliasreq ifra;
2222 int trylimit = 3; /* XXX: adhoc value */
2224 u_int32_t randid[2];
2225 time_t vltime0, pltime0;
2227 in6_prepare_ifra(&ifra, &ia0->ia_addr.sin6_addr,
2228 &ia0->ia_prefixmask.sin6_addr);
2230 ifra.ifra_addr = ia0->ia_addr; /* XXX: do we need this ? */
2231 /* clear the old IFID */
2232 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr,
2233 &ifra.ifra_prefixmask.sin6_addr);
2236 if (in6_get_tmpifid(ifp, (u_int8_t *)randid,
2237 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) {
2238 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find a good "
2242 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
2243 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
2244 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
2245 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
2248 * in6_get_tmpifid() quite likely provided a unique interface ID.
2249 * However, we may still have a chance to see collision, because
2250 * there may be a time lag between generation of the ID and generation
2251 * of the address. So, we'll do one more sanity check.
2254 if (in6_localip(&ifra.ifra_addr.sin6_addr) != 0) {
2255 if (trylimit-- > 0) {
2260 /* Give up. Something strange should have happened. */
2261 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to "
2262 "find a unique random IFID\n"));
2267 * The Valid Lifetime is the lower of the Valid Lifetime of the
2268 * public address or TEMP_VALID_LIFETIME.
2269 * The Preferred Lifetime is the lower of the Preferred Lifetime
2270 * of the public address or TEMP_PREFERRED_LIFETIME -
2273 if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
2274 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
2275 (ia0->ia6_lifetime.ia6t_vltime -
2276 (time_uptime - ia0->ia6_updatetime));
2277 if (vltime0 > V_ip6_temp_valid_lifetime)
2278 vltime0 = V_ip6_temp_valid_lifetime;
2280 vltime0 = V_ip6_temp_valid_lifetime;
2281 if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
2282 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
2283 (ia0->ia6_lifetime.ia6t_pltime -
2284 (time_uptime - ia0->ia6_updatetime));
2285 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){
2286 pltime0 = V_ip6_temp_preferred_lifetime -
2287 V_ip6_desync_factor;
2290 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor;
2291 ifra.ifra_lifetime.ia6t_vltime = vltime0;
2292 ifra.ifra_lifetime.ia6t_pltime = pltime0;
2295 * A temporary address is created only if this calculated Preferred
2296 * Lifetime is greater than REGEN_ADVANCE time units.
2298 if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance)
2301 /* XXX: scope zone ID? */
2303 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
2305 /* allocate ifaddr structure, link into chain, etc. */
2308 updateflags |= IN6_IFAUPDATE_DADDELAY;
2309 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0)
2312 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
2313 if (newia == NULL) { /* XXX: can it happen? */
2315 "in6_tmpifadd: ifa update succeeded, but we got "
2317 return (EINVAL); /* XXX */
2319 newia->ia6_ndpr = ia0->ia6_ndpr;
2320 newia->ia6_ndpr->ndpr_addrcnt++;
2321 ifa_free(&newia->ia_ifa);
2324 * A newly added address might affect the status of other addresses.
2325 * XXX: when the temporary address is generated with a new public
2326 * address, the onlink check is redundant. However, it would be safe
2327 * to do the check explicitly everywhere a new address is generated,
2328 * and, in fact, we surely need the check when we create a new
2329 * temporary address due to deprecation of an old temporary address.
2331 pfxlist_onlink_check();
2337 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
2339 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
2340 ndpr->ndpr_preferred = 0;
2342 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime;
2343 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
2344 ndpr->ndpr_expire = 0;
2346 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime;
2352 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
2354 /* init ia6t_expire */
2355 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
2356 lt6->ia6t_expire = 0;
2358 lt6->ia6t_expire = time_uptime;
2359 lt6->ia6t_expire += lt6->ia6t_vltime;
2362 /* init ia6t_preferred */
2363 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
2364 lt6->ia6t_preferred = 0;
2366 lt6->ia6t_preferred = time_uptime;
2367 lt6->ia6t_preferred += lt6->ia6t_pltime;
2372 * Delete all the routing table entries that use the specified gateway.
2373 * XXX: this function causes search through all entries of routing table, so
2374 * it shouldn't be called when acting as a router.
2377 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
2380 /* We'll care only link-local addresses */
2381 if (!IN6_IS_ADDR_LINKLOCAL(gateway))
2384 /* XXX Do we really need to walk any but the default FIB? */
2385 rt_foreach_fib_walk_del(AF_INET6, rt6_deleteroute, (void *)gateway);
2389 rt6_deleteroute(const struct rtentry *rt, void *arg)
2391 #define SIN6(s) ((struct sockaddr_in6 *)s)
2392 struct in6_addr *gate = (struct in6_addr *)arg;
2394 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
2397 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) {
2402 * Do not delete a static route.
2403 * XXX: this seems to be a bit ad-hoc. Should we consider the
2404 * 'cloned' bit instead?
2406 if ((rt->rt_flags & RTF_STATIC) != 0)
2410 * We delete only host route. This means, in particular, we don't
2411 * delete default route.
2413 if ((rt->rt_flags & RTF_HOST) == 0)
2421 nd6_setdefaultiface(int ifindex)
2425 if (ifindex < 0 || V_if_index < ifindex)
2427 if (ifindex != 0 && !ifnet_byindex(ifindex))
2430 if (V_nd6_defifindex != ifindex) {
2431 V_nd6_defifindex = ifindex;
2432 if (V_nd6_defifindex > 0)
2433 V_nd6_defifp = ifnet_byindex(V_nd6_defifindex);
2435 V_nd6_defifp = NULL;
2438 * Our current implementation assumes one-to-one maping between
2439 * interfaces and links, so it would be natural to use the
2440 * default interface as the default link.
2442 scope6_setdefault(V_nd6_defifp);