2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
36 #include "opt_inet6.h"
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/malloc.h>
42 #include <sys/socket.h>
43 #include <sys/sockio.h>
45 #include <sys/kernel.h>
47 #include <sys/errno.h>
48 #include <sys/rwlock.h>
49 #include <sys/syslog.h>
50 #include <sys/queue.h>
53 #include <net/if_types.h>
54 #include <net/if_dl.h>
55 #include <net/route.h>
56 #include <net/radix.h>
59 #include <netinet/in.h>
60 #include <net/if_llatbl.h>
61 #include <netinet6/in6_var.h>
62 #include <netinet6/in6_ifattach.h>
63 #include <netinet/ip6.h>
64 #include <netinet6/ip6_var.h>
65 #include <netinet6/nd6.h>
66 #include <netinet/icmp6.h>
67 #include <netinet6/scope6_var.h>
69 static int rtpref(struct nd_defrouter *);
70 static struct nd_defrouter *defrtrlist_update(struct nd_defrouter *);
71 static int prelist_update __P((struct nd_prefixctl *, struct nd_defrouter *,
73 static struct in6_ifaddr *in6_ifadd(struct nd_prefixctl *, int);
74 static struct nd_pfxrouter *pfxrtr_lookup __P((struct nd_prefix *,
75 struct nd_defrouter *));
76 static void pfxrtr_add(struct nd_prefix *, struct nd_defrouter *);
77 static void pfxrtr_del(struct nd_pfxrouter *);
78 static struct nd_pfxrouter *find_pfxlist_reachable_router
80 static void defrouter_delreq(struct nd_defrouter *);
81 static void nd6_rtmsg(int, struct rtentry *);
83 static int in6_init_prefix_ltimes(struct nd_prefix *);
84 static void in6_init_address_ltimes __P((struct nd_prefix *,
85 struct in6_addrlifetime *));
87 static int rt6_deleteroute(struct radix_node *, void *);
89 VNET_DECLARE(int, nd6_recalc_reachtm_interval);
90 #define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval)
92 static VNET_DEFINE(struct ifnet *, nd6_defifp);
93 VNET_DEFINE(int, nd6_defifindex);
94 #define V_nd6_defifp VNET(nd6_defifp)
96 VNET_DEFINE(int, ip6_use_tempaddr) = 0;
98 VNET_DEFINE(int, ip6_desync_factor);
99 VNET_DEFINE(u_int32_t, ip6_temp_preferred_lifetime) = DEF_TEMP_PREFERRED_LIFETIME;
100 VNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime) = DEF_TEMP_VALID_LIFETIME;
102 VNET_DEFINE(int, ip6_temp_regen_advance) = TEMPADDR_REGEN_ADVANCE;
104 /* RTPREF_MEDIUM has to be 0! */
105 #define RTPREF_HIGH 1
106 #define RTPREF_MEDIUM 0
107 #define RTPREF_LOW (-1)
108 #define RTPREF_RESERVED (-2)
109 #define RTPREF_INVALID (-3) /* internal */
112 * Receive Router Solicitation Message - just for routers.
113 * Router solicitation/advertisement is mostly managed by userland program
114 * (rtadvd) so here we have no function like nd6_ra_output().
119 nd6_rs_input(struct mbuf *m, int off, int icmp6len)
121 struct ifnet *ifp = m->m_pkthdr.rcvif;
122 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
123 struct nd_router_solicit *nd_rs;
124 struct in6_addr saddr6 = ip6->ip6_src;
127 union nd_opts ndopts;
128 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
131 * Accept RS only when V_ip6_forwarding=1 and the interface has
132 * no ND6_IFF_ACCEPT_RTADV.
134 if (!V_ip6_forwarding || ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV)
138 if (ip6->ip6_hlim != 255) {
140 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
141 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
142 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
147 * Don't update the neighbor cache, if src = ::.
148 * This indicates that the src has no IP address assigned yet.
150 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
153 #ifndef PULLDOWN_TEST
154 IP6_EXTHDR_CHECK(m, off, icmp6len,);
155 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
157 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
159 ICMP6STAT_INC(icp6s_tooshort);
164 icmp6len -= sizeof(*nd_rs);
165 nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
166 if (nd6_options(&ndopts) < 0) {
168 "nd6_rs_input: invalid ND option, ignored\n"));
169 /* nd6_options have incremented stats */
173 if (ndopts.nd_opts_src_lladdr) {
174 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
175 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
178 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
180 "nd6_rs_input: lladdrlen mismatch for %s "
181 "(if %d, RS packet %d)\n",
182 ip6_sprintf(ip6bufs, &saddr6),
183 ifp->if_addrlen, lladdrlen - 2));
187 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
194 ICMP6STAT_INC(icp6s_badrs);
199 * Receive Router Advertisement Message.
202 * TODO: on-link bit on prefix information
203 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
206 nd6_ra_input(struct mbuf *m, int off, int icmp6len)
208 struct ifnet *ifp = m->m_pkthdr.rcvif;
209 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
210 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
211 struct nd_router_advert *nd_ra;
212 struct in6_addr saddr6 = ip6->ip6_src;
214 union nd_opts ndopts;
215 struct nd_defrouter *dr;
216 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
219 * We only accept RAs only when the per-interface flag
220 * ND6_IFF_ACCEPT_RTADV is on the receiving interface.
222 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
225 if (ip6->ip6_hlim != 255) {
227 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
228 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
229 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
233 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
235 "nd6_ra_input: src %s is not link-local\n",
236 ip6_sprintf(ip6bufs, &saddr6)));
240 #ifndef PULLDOWN_TEST
241 IP6_EXTHDR_CHECK(m, off, icmp6len,);
242 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
244 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
246 ICMP6STAT_INC(icp6s_tooshort);
251 icmp6len -= sizeof(*nd_ra);
252 nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
253 if (nd6_options(&ndopts) < 0) {
255 "nd6_ra_input: invalid ND option, ignored\n"));
256 /* nd6_options have incremented stats */
261 struct nd_defrouter dr0;
262 u_int32_t advreachable = nd_ra->nd_ra_reachable;
264 /* remember if this is a multicasted advertisement */
265 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
268 bzero(&dr0, sizeof(dr0));
270 dr0.flags = nd_ra->nd_ra_flags_reserved;
272 * Effectively-disable routes from RA messages when
273 * ND6_IFF_NO_RADR enabled on the receiving interface or
274 * (ip6.forwarding == 1 && ip6.rfc6204w3 != 1).
276 if (ndi->flags & ND6_IFF_NO_RADR)
278 else if (V_ip6_forwarding && !V_ip6_rfc6204w3)
281 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
282 dr0.expire = time_second + dr0.rtlifetime;
284 /* unspecified or not? (RFC 2461 6.3.4) */
286 advreachable = ntohl(advreachable);
287 if (advreachable <= MAX_REACHABLE_TIME &&
288 ndi->basereachable != advreachable) {
289 ndi->basereachable = advreachable;
290 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
291 ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */
294 if (nd_ra->nd_ra_retransmit)
295 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
296 if (nd_ra->nd_ra_curhoplimit)
297 ndi->chlim = nd_ra->nd_ra_curhoplimit;
298 dr = defrtrlist_update(&dr0);
304 if (ndopts.nd_opts_pi) {
305 struct nd_opt_hdr *pt;
306 struct nd_opt_prefix_info *pi = NULL;
307 struct nd_prefixctl pr;
309 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
310 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
311 pt = (struct nd_opt_hdr *)((caddr_t)pt +
312 (pt->nd_opt_len << 3))) {
313 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
315 pi = (struct nd_opt_prefix_info *)pt;
317 if (pi->nd_opt_pi_len != 4) {
319 "nd6_ra_input: invalid option "
320 "len %d for prefix information option, "
321 "ignored\n", pi->nd_opt_pi_len));
325 if (128 < pi->nd_opt_pi_prefix_len) {
327 "nd6_ra_input: invalid prefix "
328 "len %d for prefix information option, "
329 "ignored\n", pi->nd_opt_pi_prefix_len));
333 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
334 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
336 "nd6_ra_input: invalid prefix "
339 &pi->nd_opt_pi_prefix)));
343 bzero(&pr, sizeof(pr));
344 pr.ndpr_prefix.sin6_family = AF_INET6;
345 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
346 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
347 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
349 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
350 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
351 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
352 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
353 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
354 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
355 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
356 (void)prelist_update(&pr, dr, m, mcast);
363 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
367 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
370 if (mtu < IPV6_MMTU) {
371 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
372 "mtu=%lu sent from %s, ignoring\n",
373 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src)));
378 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
379 ? ndi->maxmtu : ifp->if_mtu;
381 int change = (ndi->linkmtu != mtu);
384 if (change) /* in6_maxmtu may change */
387 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
388 "mtu=%lu sent from %s; "
389 "exceeds maxmtu %lu, ignoring\n",
390 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu));
397 * Source link layer address
403 if (ndopts.nd_opts_src_lladdr) {
404 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
405 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
408 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
410 "nd6_ra_input: lladdrlen mismatch for %s "
411 "(if %d, RA packet %d)\n", ip6_sprintf(ip6bufs, &saddr6),
412 ifp->if_addrlen, lladdrlen - 2));
416 nd6_cache_lladdr(ifp, &saddr6, lladdr,
417 lladdrlen, ND_ROUTER_ADVERT, 0);
420 * Installing a link-layer address might change the state of the
421 * router's neighbor cache, which might also affect our on-link
422 * detection of adveritsed prefixes.
424 pfxlist_onlink_check();
432 ICMP6STAT_INC(icp6s_badra);
437 * default router list proccessing sub routines
440 /* tell the change to user processes watching the routing socket. */
442 nd6_rtmsg(int cmd, struct rtentry *rt)
444 struct rt_addrinfo info;
448 bzero((caddr_t)&info, sizeof(info));
449 info.rti_info[RTAX_DST] = rt_key(rt);
450 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
451 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
455 ifa = TAILQ_FIRST(&ifp->if_addrhead);
456 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
459 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
463 rt_missmsg(cmd, &info, rt->rt_flags, 0);
469 defrouter_addreq(struct nd_defrouter *new)
471 struct sockaddr_in6 def, mask, gate;
472 struct rtentry *newrt = NULL;
476 bzero(&def, sizeof(def));
477 bzero(&mask, sizeof(mask));
478 bzero(&gate, sizeof(gate));
480 def.sin6_len = mask.sin6_len = gate.sin6_len =
481 sizeof(struct sockaddr_in6);
482 def.sin6_family = gate.sin6_family = AF_INET6;
483 gate.sin6_addr = new->rtaddr;
486 error = rtrequest(RTM_ADD, (struct sockaddr *)&def,
487 (struct sockaddr *)&gate, (struct sockaddr *)&mask,
488 RTF_GATEWAY, &newrt);
490 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
499 struct nd_defrouter *
500 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
502 struct nd_defrouter *dr;
504 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
505 dr = TAILQ_NEXT(dr, dr_entry)) {
506 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
510 return (NULL); /* search failed */
514 * Remove the default route for a given router.
515 * This is just a subroutine function for defrouter_select(), and should
516 * not be called from anywhere else.
519 defrouter_delreq(struct nd_defrouter *dr)
521 struct sockaddr_in6 def, mask, gate;
522 struct rtentry *oldrt = NULL;
524 bzero(&def, sizeof(def));
525 bzero(&mask, sizeof(mask));
526 bzero(&gate, sizeof(gate));
528 def.sin6_len = mask.sin6_len = gate.sin6_len =
529 sizeof(struct sockaddr_in6);
530 def.sin6_family = gate.sin6_family = AF_INET6;
531 gate.sin6_addr = dr->rtaddr;
533 rtrequest(RTM_DELETE, (struct sockaddr *)&def,
534 (struct sockaddr *)&gate,
535 (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt);
537 nd6_rtmsg(RTM_DELETE, oldrt);
545 * remove all default routes from default router list
548 defrouter_reset(void)
550 struct nd_defrouter *dr;
552 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
553 dr = TAILQ_NEXT(dr, dr_entry))
554 defrouter_delreq(dr);
557 * XXX should we also nuke any default routers in the kernel, by
558 * going through them by rtalloc1()?
563 defrtrlist_del(struct nd_defrouter *dr)
565 struct nd_defrouter *deldr = NULL;
566 struct nd_prefix *pr;
569 * Flush all the routing table entries that use the router
572 if (ND_IFINFO(dr->ifp)->flags & ND6_IFF_ACCEPT_RTADV)
573 rt6_flush(&dr->rtaddr, dr->ifp);
577 defrouter_delreq(dr);
579 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
582 * Also delete all the pointers to the router in each prefix lists.
584 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
585 struct nd_pfxrouter *pfxrtr;
586 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
589 pfxlist_onlink_check();
592 * If the router is the primary one, choose a new one.
593 * Note that defrouter_select() will remove the current gateway
594 * from the routing table.
603 * Default Router Selection according to Section 6.3.6 of RFC 2461 and
604 * draft-ietf-ipngwg-router-selection:
605 * 1) Routers that are reachable or probably reachable should be preferred.
606 * If we have more than one (probably) reachable router, prefer ones
607 * with the highest router preference.
608 * 2) When no routers on the list are known to be reachable or
609 * probably reachable, routers SHOULD be selected in a round-robin
610 * fashion, regardless of router preference values.
611 * 3) If the Default Router List is empty, assume that all
612 * destinations are on-link.
614 * We assume nd_defrouter is sorted by router preference value.
615 * Since the code below covers both with and without router preference cases,
616 * we do not need to classify the cases by ifdef.
618 * At this moment, we do not try to install more than one default router,
619 * even when the multipath routing is available, because we're not sure about
620 * the benefits for stub hosts comparing to the risk of making the code
621 * complicated and the possibility of introducing bugs.
624 defrouter_select(void)
627 struct nd_defrouter *dr, *selected_dr = NULL, *installed_dr = NULL;
628 struct llentry *ln = NULL;
631 * Let's handle easy case (3) first:
632 * If default router list is empty, there's nothing to be done.
634 if (!TAILQ_FIRST(&V_nd_defrouter)) {
640 * Search for a (probably) reachable router from the list.
641 * We just pick up the first reachable one (if any), assuming that
642 * the ordering rule of the list described in defrtrlist_update().
644 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
645 dr = TAILQ_NEXT(dr, dr_entry)) {
646 IF_AFDATA_LOCK(dr->ifp);
647 if (selected_dr == NULL &&
648 (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
649 ND6_IS_LLINFO_PROBREACH(ln)) {
652 IF_AFDATA_UNLOCK(dr->ifp);
658 if (dr->installed && installed_dr == NULL)
660 else if (dr->installed && installed_dr) {
661 /* this should not happen. warn for diagnosis. */
662 log(LOG_ERR, "defrouter_select: more than one router"
667 * If none of the default routers was found to be reachable,
668 * round-robin the list regardless of preference.
669 * Otherwise, if we have an installed router, check if the selected
670 * (reachable) router should really be preferred to the installed one.
671 * We only prefer the new router when the old one is not reachable
672 * or when the new one has a really higher preference value.
674 if (selected_dr == NULL) {
675 if (installed_dr == NULL || !TAILQ_NEXT(installed_dr, dr_entry))
676 selected_dr = TAILQ_FIRST(&V_nd_defrouter);
678 selected_dr = TAILQ_NEXT(installed_dr, dr_entry);
679 } else if (installed_dr) {
680 IF_AFDATA_LOCK(installed_dr->ifp);
681 if ((ln = nd6_lookup(&installed_dr->rtaddr, 0, installed_dr->ifp)) &&
682 ND6_IS_LLINFO_PROBREACH(ln) &&
683 rtpref(selected_dr) <= rtpref(installed_dr)) {
684 selected_dr = installed_dr;
686 IF_AFDATA_UNLOCK(installed_dr->ifp);
692 * If the selected router is different than the installed one,
693 * remove the installed router and install the selected one.
694 * Note that the selected router is never NULL here.
696 if (installed_dr != selected_dr) {
698 defrouter_delreq(installed_dr);
699 defrouter_addreq(selected_dr);
707 * for default router selection
708 * regards router-preference field as a 2-bit signed integer
711 rtpref(struct nd_defrouter *dr)
713 switch (dr->flags & ND_RA_FLAG_RTPREF_MASK) {
714 case ND_RA_FLAG_RTPREF_HIGH:
715 return (RTPREF_HIGH);
716 case ND_RA_FLAG_RTPREF_MEDIUM:
717 case ND_RA_FLAG_RTPREF_RSV:
718 return (RTPREF_MEDIUM);
719 case ND_RA_FLAG_RTPREF_LOW:
723 * This case should never happen. If it did, it would mean a
724 * serious bug of kernel internal. We thus always bark here.
725 * Or, can we even panic?
727 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->flags);
728 return (RTPREF_INVALID);
733 static struct nd_defrouter *
734 defrtrlist_update(struct nd_defrouter *new)
736 struct nd_defrouter *dr, *n;
739 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
741 if (new->rtlifetime == 0) {
745 int oldpref = rtpref(dr);
748 dr->flags = new->flags; /* xxx flag check */
749 dr->rtlifetime = new->rtlifetime;
750 dr->expire = new->expire;
753 * If the preference does not change, there's no need
754 * to sort the entries. Also make sure the selected
755 * router is still installed in the kernel.
757 if (dr->installed && rtpref(new) == oldpref) {
763 * preferred router may be changed, so relocate
765 * XXX: calling TAILQ_REMOVE directly is a bad manner.
766 * However, since defrtrlist_del() has many side
767 * effects, we intentionally do so here.
768 * defrouter_select() below will handle routing
771 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
779 /* entry does not exist */
780 if (new->rtlifetime == 0) {
785 n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
790 bzero(n, sizeof(*n));
795 * Insert the new router in the Default Router List;
796 * The Default Router List should be in the descending order
797 * of router-preferece. Routers with the same preference are
798 * sorted in the arriving time order.
801 /* insert at the end of the group */
802 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
803 dr = TAILQ_NEXT(dr, dr_entry)) {
804 if (rtpref(n) > rtpref(dr))
808 TAILQ_INSERT_BEFORE(dr, n, dr_entry);
810 TAILQ_INSERT_TAIL(&V_nd_defrouter, n, dr_entry);
819 static struct nd_pfxrouter *
820 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
822 struct nd_pfxrouter *search;
824 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
825 if (search->router == dr)
833 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
835 struct nd_pfxrouter *new;
837 new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
840 bzero(new, sizeof(*new));
843 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
845 pfxlist_onlink_check();
849 pfxrtr_del(struct nd_pfxrouter *pfr)
851 LIST_REMOVE(pfr, pfr_entry);
856 nd6_prefix_lookup(struct nd_prefixctl *key)
858 struct nd_prefix *search;
860 for (search = V_nd_prefix.lh_first;
861 search; search = search->ndpr_next) {
862 if (key->ndpr_ifp == search->ndpr_ifp &&
863 key->ndpr_plen == search->ndpr_plen &&
864 in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr,
865 &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) {
874 nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr,
875 struct nd_prefix **newp)
877 struct nd_prefix *new = NULL;
880 char ip6buf[INET6_ADDRSTRLEN];
882 new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
885 bzero(new, sizeof(*new));
886 new->ndpr_ifp = pr->ndpr_ifp;
887 new->ndpr_prefix = pr->ndpr_prefix;
888 new->ndpr_plen = pr->ndpr_plen;
889 new->ndpr_vltime = pr->ndpr_vltime;
890 new->ndpr_pltime = pr->ndpr_pltime;
891 new->ndpr_flags = pr->ndpr_flags;
892 if ((error = in6_init_prefix_ltimes(new)) != 0) {
896 new->ndpr_lastupdate = time_second;
901 LIST_INIT(&new->ndpr_advrtrs);
902 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
903 /* make prefix in the canonical form */
904 for (i = 0; i < 4; i++)
905 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
906 new->ndpr_mask.s6_addr32[i];
909 /* link ndpr_entry to nd_prefix list */
910 LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry);
913 /* ND_OPT_PI_FLAG_ONLINK processing */
914 if (new->ndpr_raf_onlink) {
917 if ((e = nd6_prefix_onlink(new)) != 0) {
918 nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
919 "the prefix %s/%d on-link on %s (errno=%d)\n",
920 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
921 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
922 /* proceed anyway. XXX: is it correct? */
933 prelist_remove(struct nd_prefix *pr)
935 struct nd_pfxrouter *pfr, *next;
937 char ip6buf[INET6_ADDRSTRLEN];
939 /* make sure to invalidate the prefix until it is really freed. */
944 * Though these flags are now meaningless, we'd rather keep the value
945 * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users
946 * when executing "ndp -p".
949 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
950 (e = nd6_prefix_offlink(pr)) != 0) {
951 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
953 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
954 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
955 /* what should we do? */
958 if (pr->ndpr_refcnt > 0)
959 return; /* notice here? */
963 /* unlink ndpr_entry from nd_prefix list */
964 LIST_REMOVE(pr, ndpr_entry);
966 /* free list of routers that adversed the prefix */
967 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
968 next = pfr->pfr_next;
976 pfxlist_onlink_check();
984 prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr,
985 struct mbuf *m, int mcast)
987 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
989 struct ifnet *ifp = new->ndpr_ifp;
990 struct nd_prefix *pr;
995 struct in6_addrlifetime lt6_tmp;
996 char ip6buf[INET6_ADDRSTRLEN];
1001 * Authenticity for NA consists authentication for
1002 * both IP header and IP datagrams, doesn't it ?
1004 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
1005 auth = ((m->m_flags & M_AUTHIPHDR) &&
1006 (m->m_flags & M_AUTHIPDGM));
1010 if ((pr = nd6_prefix_lookup(new)) != NULL) {
1012 * nd6_prefix_lookup() ensures that pr and new have the same
1013 * prefix on a same interface.
1017 * Update prefix information. Note that the on-link (L) bit
1018 * and the autonomous (A) bit should NOT be changed from 1
1021 if (new->ndpr_raf_onlink == 1)
1022 pr->ndpr_raf_onlink = 1;
1023 if (new->ndpr_raf_auto == 1)
1024 pr->ndpr_raf_auto = 1;
1025 if (new->ndpr_raf_onlink) {
1026 pr->ndpr_vltime = new->ndpr_vltime;
1027 pr->ndpr_pltime = new->ndpr_pltime;
1028 (void)in6_init_prefix_ltimes(pr); /* XXX error case? */
1029 pr->ndpr_lastupdate = time_second;
1032 if (new->ndpr_raf_onlink &&
1033 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1036 if ((e = nd6_prefix_onlink(pr)) != 0) {
1038 "prelist_update: failed to make "
1039 "the prefix %s/%d on-link on %s "
1042 &pr->ndpr_prefix.sin6_addr),
1043 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
1044 /* proceed anyway. XXX: is it correct? */
1048 if (dr && pfxrtr_lookup(pr, dr) == NULL)
1051 struct nd_prefix *newpr = NULL;
1055 if (new->ndpr_vltime == 0)
1057 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
1060 error = nd6_prelist_add(new, dr, &newpr);
1061 if (error != 0 || newpr == NULL) {
1062 nd6log((LOG_NOTICE, "prelist_update: "
1063 "nd6_prelist_add failed for %s/%d on %s "
1064 "errno=%d, returnpr=%p\n",
1065 ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr),
1066 new->ndpr_plen, if_name(new->ndpr_ifp),
1068 goto end; /* we should just give up in this case. */
1072 * XXX: from the ND point of view, we can ignore a prefix
1073 * with the on-link bit being zero. However, we need a
1074 * prefix structure for references from autoconfigured
1075 * addresses. Thus, we explicitly make sure that the prefix
1076 * itself expires now.
1078 if (newpr->ndpr_raf_onlink == 0) {
1079 newpr->ndpr_vltime = 0;
1080 newpr->ndpr_pltime = 0;
1081 in6_init_prefix_ltimes(newpr);
1088 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1089 * Note that pr must be non NULL at this point.
1092 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1093 if (!new->ndpr_raf_auto)
1097 * 5.5.3 (b). the link-local prefix should have been ignored in
1101 /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */
1102 if (new->ndpr_pltime > new->ndpr_vltime) {
1103 error = EINVAL; /* XXX: won't be used */
1108 * 5.5.3 (d). If the prefix advertised is not equal to the prefix of
1109 * an address configured by stateless autoconfiguration already in the
1110 * list of addresses associated with the interface, and the Valid
1111 * Lifetime is not 0, form an address. We first check if we have
1112 * a matching prefix.
1113 * Note: we apply a clarification in rfc2462bis-02 here. We only
1114 * consider autoconfigured addresses while RFC2462 simply said
1118 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1119 struct in6_ifaddr *ifa6;
1120 u_int32_t remaininglifetime;
1122 if (ifa->ifa_addr->sa_family != AF_INET6)
1125 ifa6 = (struct in6_ifaddr *)ifa;
1128 * We only consider autoconfigured addresses as per rfc2462bis.
1130 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
1134 * Spec is not clear here, but I believe we should concentrate
1135 * on unicast (i.e. not anycast) addresses.
1136 * XXX: other ia6_flags? detached or duplicated?
1138 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
1142 * Ignore the address if it is not associated with a prefix
1143 * or is associated with a prefix that is different from this
1144 * one. (pr is never NULL here)
1146 if (ifa6->ia6_ndpr != pr)
1149 if (ia6_match == NULL) /* remember the first one */
1153 * An already autoconfigured address matched. Now that we
1154 * are sure there is at least one matched address, we can
1155 * proceed to 5.5.3. (e): update the lifetimes according to the
1156 * "two hours" rule and the privacy extension.
1157 * We apply some clarifications in rfc2462bis:
1158 * - use remaininglifetime instead of storedlifetime as a
1160 * - remove the dead code in the "two-hour" rule
1162 #define TWOHOUR (120*60)
1163 lt6_tmp = ifa6->ia6_lifetime;
1165 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1166 remaininglifetime = ND6_INFINITE_LIFETIME;
1167 else if (time_second - ifa6->ia6_updatetime >
1168 lt6_tmp.ia6t_vltime) {
1170 * The case of "invalid" address. We should usually
1171 * not see this case.
1173 remaininglifetime = 0;
1175 remaininglifetime = lt6_tmp.ia6t_vltime -
1176 (time_second - ifa6->ia6_updatetime);
1178 /* when not updating, keep the current stored lifetime. */
1179 lt6_tmp.ia6t_vltime = remaininglifetime;
1181 if (TWOHOUR < new->ndpr_vltime ||
1182 remaininglifetime < new->ndpr_vltime) {
1183 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1184 } else if (remaininglifetime <= TWOHOUR) {
1186 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1190 * new->ndpr_vltime <= TWOHOUR &&
1191 * TWOHOUR < remaininglifetime
1193 lt6_tmp.ia6t_vltime = TWOHOUR;
1196 /* The 2 hour rule is not imposed for preferred lifetime. */
1197 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1199 in6_init_address_ltimes(pr, <6_tmp);
1202 * We need to treat lifetimes for temporary addresses
1203 * differently, according to
1204 * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1);
1205 * we only update the lifetimes when they are in the maximum
1208 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
1209 u_int32_t maxvltime, maxpltime;
1211 if (V_ip6_temp_valid_lifetime >
1212 (u_int32_t)((time_second - ifa6->ia6_createtime) +
1213 V_ip6_desync_factor)) {
1214 maxvltime = V_ip6_temp_valid_lifetime -
1215 (time_second - ifa6->ia6_createtime) -
1216 V_ip6_desync_factor;
1219 if (V_ip6_temp_preferred_lifetime >
1220 (u_int32_t)((time_second - ifa6->ia6_createtime) +
1221 V_ip6_desync_factor)) {
1222 maxpltime = V_ip6_temp_preferred_lifetime -
1223 (time_second - ifa6->ia6_createtime) -
1224 V_ip6_desync_factor;
1228 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME ||
1229 lt6_tmp.ia6t_vltime > maxvltime) {
1230 lt6_tmp.ia6t_vltime = maxvltime;
1232 if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME ||
1233 lt6_tmp.ia6t_pltime > maxpltime) {
1234 lt6_tmp.ia6t_pltime = maxpltime;
1237 ifa6->ia6_lifetime = lt6_tmp;
1238 ifa6->ia6_updatetime = time_second;
1240 IF_ADDR_UNLOCK(ifp);
1241 if (ia6_match == NULL && new->ndpr_vltime) {
1245 * 5.5.3 (d) (continued)
1246 * No address matched and the valid lifetime is non-zero.
1247 * Create a new address.
1251 * Prefix Length check:
1252 * If the sum of the prefix length and interface identifier
1253 * length does not equal 128 bits, the Prefix Information
1254 * option MUST be ignored. The length of the interface
1255 * identifier is defined in a separate link-type specific
1258 ifidlen = in6_if2idlen(ifp);
1260 /* this should not happen, so we always log it. */
1261 log(LOG_ERR, "prelist_update: IFID undefined (%s)\n",
1265 if (ifidlen + pr->ndpr_plen != 128) {
1267 "prelist_update: invalid prefixlen "
1268 "%d for %s, ignored\n",
1269 pr->ndpr_plen, if_name(ifp)));
1273 if ((ia6 = in6_ifadd(new, mcast)) != NULL) {
1275 * note that we should use pr (not new) for reference.
1282 * When a new public address is created as described
1283 * in RFC2462, also create a new temporary address.
1286 * When an interface connects to a new link, a new
1287 * randomized interface identifier should be generated
1288 * immediately together with a new set of temporary
1289 * addresses. Thus, we specifiy 1 as the 2nd arg of
1292 if (V_ip6_use_tempaddr) {
1294 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) {
1295 nd6log((LOG_NOTICE, "prelist_update: "
1296 "failed to create a temporary "
1297 "address, errno=%d\n",
1301 ifa_free(&ia6->ia_ifa);
1304 * A newly added address might affect the status
1305 * of other addresses, so we check and update it.
1306 * XXX: what if address duplication happens?
1308 pfxlist_onlink_check();
1310 /* just set an error. do not bark here. */
1311 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1321 * A supplement function used in the on-link detection below;
1322 * detect if a given prefix has a (probably) reachable advertising router.
1323 * XXX: lengthy function name...
1325 static struct nd_pfxrouter *
1326 find_pfxlist_reachable_router(struct nd_prefix *pr)
1328 struct nd_pfxrouter *pfxrtr;
1332 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr != NULL;
1333 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
1334 IF_AFDATA_LOCK(pfxrtr->router->ifp);
1335 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp);
1336 IF_AFDATA_UNLOCK(pfxrtr->router->ifp);
1339 canreach = ND6_IS_LLINFO_PROBREACH(ln);
1348 * Check if each prefix in the prefix list has at least one available router
1349 * that advertised the prefix (a router is "available" if its neighbor cache
1350 * entry is reachable or probably reachable).
1351 * If the check fails, the prefix may be off-link, because, for example,
1352 * we have moved from the network but the lifetime of the prefix has not
1353 * expired yet. So we should not use the prefix if there is another prefix
1354 * that has an available router.
1355 * But, if there is no prefix that has an available router, we still regards
1356 * all the prefixes as on-link. This is because we can't tell if all the
1357 * routers are simply dead or if we really moved from the network and there
1358 * is no router around us.
1361 pfxlist_onlink_check()
1363 struct nd_prefix *pr;
1364 struct in6_ifaddr *ifa;
1365 struct nd_defrouter *dr;
1366 struct nd_pfxrouter *pfxrtr = NULL;
1369 * Check if there is a prefix that has a reachable advertising
1372 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1373 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1378 * If we have no such prefix, check whether we still have a router
1379 * that does not advertise any prefixes.
1382 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
1383 dr = TAILQ_NEXT(dr, dr_entry)) {
1384 struct nd_prefix *pr0;
1386 for (pr0 = V_nd_prefix.lh_first; pr0;
1387 pr0 = pr0->ndpr_next) {
1388 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
1395 if (pr != NULL || (TAILQ_FIRST(&V_nd_defrouter) && pfxrtr == NULL)) {
1397 * There is at least one prefix that has a reachable router,
1398 * or at least a router which probably does not advertise
1399 * any prefixes. The latter would be the case when we move
1400 * to a new link where we have a router that does not provide
1401 * prefixes and we configure an address by hand.
1402 * Detach prefixes which have no reachable advertising
1403 * router, and attach other prefixes.
1405 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1406 /* XXX: a link-local prefix should never be detached */
1407 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1411 * we aren't interested in prefixes without the L bit
1414 if (pr->ndpr_raf_onlink == 0)
1417 if (pr->ndpr_raf_auto == 0)
1420 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1421 find_pfxlist_reachable_router(pr) == NULL)
1422 pr->ndpr_stateflags |= NDPRF_DETACHED;
1423 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1424 find_pfxlist_reachable_router(pr) != 0)
1425 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1428 /* there is no prefix that has a reachable router */
1429 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1430 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1433 if (pr->ndpr_raf_onlink == 0)
1436 if (pr->ndpr_raf_auto == 0)
1439 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1440 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1445 * Remove each interface route associated with a (just) detached
1446 * prefix, and reinstall the interface route for a (just) attached
1447 * prefix. Note that all attempt of reinstallation does not
1448 * necessarily success, when a same prefix is shared among multiple
1449 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1450 * so we don't have to care about them.
1452 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1454 char ip6buf[INET6_ADDRSTRLEN];
1456 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1459 if (pr->ndpr_raf_onlink == 0)
1462 if (pr->ndpr_raf_auto == 0)
1465 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1466 (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1467 if ((e = nd6_prefix_offlink(pr)) != 0) {
1469 "pfxlist_onlink_check: failed to "
1470 "make %s/%d offlink, errno=%d\n",
1472 &pr->ndpr_prefix.sin6_addr),
1476 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1477 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 &&
1478 pr->ndpr_raf_onlink) {
1479 if ((e = nd6_prefix_onlink(pr)) != 0) {
1481 "pfxlist_onlink_check: failed to "
1482 "make %s/%d onlink, errno=%d\n",
1484 &pr->ndpr_prefix.sin6_addr),
1491 * Changes on the prefix status might affect address status as well.
1492 * Make sure that all addresses derived from an attached prefix are
1493 * attached, and that all addresses derived from a detached prefix are
1494 * detached. Note, however, that a manually configured address should
1495 * always be attached.
1496 * The precise detection logic is same as the one for prefixes.
1498 * XXXRW: in6_ifaddrhead locking.
1500 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1501 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1504 if (ifa->ia6_ndpr == NULL) {
1506 * This can happen when we first configure the address
1507 * (i.e. the address exists, but the prefix does not).
1508 * XXX: complicated relationships...
1513 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1517 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1518 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1521 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1524 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) {
1525 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1526 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1527 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1528 nd6_dad_start((struct ifaddr *)ifa, 0);
1531 ifa->ia6_flags |= IN6_IFF_DETACHED;
1536 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1537 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1540 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1541 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1542 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1543 /* Do we need a delay in this case? */
1544 nd6_dad_start((struct ifaddr *)ifa, 0);
1551 nd6_prefix_onlink(struct nd_prefix *pr)
1554 struct ifnet *ifp = pr->ndpr_ifp;
1555 struct sockaddr_in6 mask6;
1556 struct nd_prefix *opr;
1559 struct radix_node_head *rnh;
1560 struct rtentry *rt = NULL;
1561 char ip6buf[INET6_ADDRSTRLEN];
1562 struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
1565 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1567 "nd6_prefix_onlink: %s/%d is already on-link\n",
1568 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1574 * Add the interface route associated with the prefix. Before
1575 * installing the route, check if there's the same prefix on another
1576 * interface, and the prefix has already installed the interface route.
1577 * Although such a configuration is expected to be rare, we explicitly
1580 for (opr = V_nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1584 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
1587 if (opr->ndpr_plen == pr->ndpr_plen &&
1588 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1589 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen))
1594 * We prefer link-local addresses as the associated interface address.
1596 /* search for a link-local addr */
1597 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
1598 IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
1600 /* XXX: freebsd does not have ifa_ifwithaf */
1602 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1603 if (ifa->ifa_addr->sa_family == AF_INET6)
1608 IF_ADDR_UNLOCK(ifp);
1609 /* should we care about ia6_flags? */
1613 * This can still happen, when, for example, we receive an RA
1614 * containing a prefix with the L bit set and the A bit clear,
1615 * after removing all IPv6 addresses on the receiving
1616 * interface. This should, of course, be rare though.
1619 "nd6_prefix_onlink: failed to find any ifaddr"
1620 " to add route for a prefix(%s/%d) on %s\n",
1621 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1622 pr->ndpr_plen, if_name(ifp)));
1627 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1628 * ifa->ifa_rtrequest = nd6_rtrequest;
1630 bzero(&mask6, sizeof(mask6));
1631 mask6.sin6_len = sizeof(mask6);
1632 mask6.sin6_addr = pr->ndpr_mask;
1633 rtflags = (ifa->ifa_flags & ~IFA_RTSELF) | RTF_UP;
1634 error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix,
1635 ifa->ifa_addr, (struct sockaddr *)&mask6, rtflags, &rt);
1637 if (rt != NULL) /* this should be non NULL, though */ {
1638 rnh = rt_tables_get_rnh(rt->rt_fibnum, AF_INET6);
1639 /* XXX what if rhn == NULL? */
1640 RADIX_NODE_HEAD_LOCK(rnh);
1642 if (!rt_setgate(rt, rt_key(rt), (struct sockaddr *)&null_sdl)) {
1643 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type =
1644 rt->rt_ifp->if_type;
1645 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index =
1646 rt->rt_ifp->if_index;
1648 RADIX_NODE_HEAD_UNLOCK(rnh);
1649 nd6_rtmsg(RTM_ADD, rt);
1652 pr->ndpr_stateflags |= NDPRF_ONLINK;
1654 char ip6bufg[INET6_ADDRSTRLEN], ip6bufm[INET6_ADDRSTRLEN];
1655 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a"
1656 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
1658 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1659 pr->ndpr_plen, if_name(ifp),
1660 ip6_sprintf(ip6bufg, &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
1661 ip6_sprintf(ip6bufm, &mask6.sin6_addr), rtflags, error));
1676 nd6_prefix_offlink(struct nd_prefix *pr)
1679 struct ifnet *ifp = pr->ndpr_ifp;
1680 struct nd_prefix *opr;
1681 struct sockaddr_in6 sa6, mask6;
1682 struct rtentry *rt = NULL;
1683 char ip6buf[INET6_ADDRSTRLEN];
1686 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1688 "nd6_prefix_offlink: %s/%d is already off-link\n",
1689 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1694 bzero(&sa6, sizeof(sa6));
1695 sa6.sin6_family = AF_INET6;
1696 sa6.sin6_len = sizeof(sa6);
1697 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
1698 sizeof(struct in6_addr));
1699 bzero(&mask6, sizeof(mask6));
1700 mask6.sin6_family = AF_INET6;
1701 mask6.sin6_len = sizeof(sa6);
1702 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
1703 error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
1704 (struct sockaddr *)&mask6, 0, &rt);
1706 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
1708 /* report the route deletion to the routing socket. */
1710 nd6_rtmsg(RTM_DELETE, rt);
1713 * There might be the same prefix on another interface,
1714 * the prefix which could not be on-link just because we have
1715 * the interface route (see comments in nd6_prefix_onlink).
1716 * If there's one, try to make the prefix on-link on the
1719 for (opr = V_nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1723 if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
1727 * KAME specific: detached prefixes should not be
1730 if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1733 if (opr->ndpr_plen == pr->ndpr_plen &&
1734 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1735 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
1738 if ((e = nd6_prefix_onlink(opr)) != 0) {
1740 "nd6_prefix_offlink: failed to "
1741 "recover a prefix %s/%d from %s "
1742 "to %s (errno = %d)\n",
1744 &opr->ndpr_prefix.sin6_addr),
1745 opr->ndpr_plen, if_name(ifp),
1746 if_name(opr->ndpr_ifp), e));
1751 /* XXX: can we still set the NDPRF_ONLINK flag? */
1753 "nd6_prefix_offlink: failed to delete route: "
1754 "%s/%d on %s (errno = %d)\n",
1755 ip6_sprintf(ip6buf, &sa6.sin6_addr), pr->ndpr_plen,
1756 if_name(ifp), error));
1766 static struct in6_ifaddr *
1767 in6_ifadd(struct nd_prefixctl *pr, int mcast)
1769 struct ifnet *ifp = pr->ndpr_ifp;
1771 struct in6_aliasreq ifra;
1772 struct in6_ifaddr *ia, *ib;
1774 struct in6_addr mask;
1775 int prefixlen = pr->ndpr_plen;
1777 char ip6buf[INET6_ADDRSTRLEN];
1779 in6_prefixlen2mask(&mask, prefixlen);
1782 * find a link-local address (will be interface ID).
1783 * Is it really mandatory? Theoretically, a global or a site-local
1784 * address can be configured without a link-local address, if we
1785 * have a unique interface identifier...
1787 * it is not mandatory to have a link-local address, we can generate
1788 * interface identifier on the fly. we do this because:
1789 * (1) it should be the easiest way to find interface identifier.
1790 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1791 * for multiple addresses on a single interface, and possible shortcut
1792 * of DAD. we omitted DAD for this reason in the past.
1793 * (3) a user can prevent autoconfiguration of global address
1794 * by removing link-local address by hand (this is partly because we
1795 * don't have other way to control the use of IPv6 on an interface.
1796 * this has been our design choice - cf. NRL's "ifconfig auto").
1797 * (4) it is easier to manage when an interface has addresses
1798 * with the same interface identifier, than to have multiple addresses
1799 * with different interface identifiers.
1801 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
1803 ib = (struct in6_ifaddr *)ifa;
1807 /* prefixlen + ifidlen must be equal to 128 */
1808 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
1809 if (prefixlen != plen0) {
1811 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
1812 "(prefix=%d ifid=%d)\n",
1813 if_name(ifp), prefixlen, 128 - plen0));
1819 bzero(&ifra, sizeof(ifra));
1821 * in6_update_ifa() does not use ifra_name, but we accurately set it
1824 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1825 ifra.ifra_addr.sin6_family = AF_INET6;
1826 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
1828 ifra.ifra_addr.sin6_addr = pr->ndpr_prefix.sin6_addr;
1829 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
1830 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
1831 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
1832 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
1835 ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
1836 (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
1837 ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
1838 (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
1839 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
1840 (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
1841 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
1842 (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
1845 /* new prefix mask. */
1846 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1847 ifra.ifra_prefixmask.sin6_family = AF_INET6;
1848 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
1849 sizeof(ifra.ifra_prefixmask.sin6_addr));
1852 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
1853 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
1855 /* XXX: scope zone ID? */
1857 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
1860 * Make sure that we do not have this address already. This should
1861 * usually not happen, but we can still see this case, e.g., if we
1862 * have manually configured the exact address to be configured.
1864 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
1865 &ifra.ifra_addr.sin6_addr);
1868 /* this should be rare enough to make an explicit log */
1869 log(LOG_INFO, "in6_ifadd: %s is already configured\n",
1870 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr));
1875 * Allocate ifaddr structure, link into chain, etc.
1876 * If we are going to create a new address upon receiving a multicasted
1877 * RA, we need to impose a random delay before starting DAD.
1878 * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2]
1882 updateflags |= IN6_IFAUPDATE_DADDELAY;
1883 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) {
1885 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
1886 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr),
1887 if_name(ifp), error));
1888 return (NULL); /* ifaddr must not have been allocated. */
1891 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1893 * XXXRW: Assumption of non-NULLness here might not be true with
1894 * fine-grained locking -- should we validate it? Or just return
1895 * earlier ifa rather than looking it up again?
1897 return (ia); /* this is always non-NULL and referenced. */
1901 * ia0 - corresponding public address
1904 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay)
1906 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
1907 struct in6_ifaddr *newia, *ia;
1908 struct in6_aliasreq ifra;
1910 int trylimit = 3; /* XXX: adhoc value */
1912 u_int32_t randid[2];
1913 time_t vltime0, pltime0;
1915 bzero(&ifra, sizeof(ifra));
1916 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1917 ifra.ifra_addr = ia0->ia_addr;
1918 /* copy prefix mask */
1919 ifra.ifra_prefixmask = ia0->ia_prefixmask;
1920 /* clear the old IFID */
1921 for (i = 0; i < 4; i++) {
1922 ifra.ifra_addr.sin6_addr.s6_addr32[i] &=
1923 ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
1927 if (in6_get_tmpifid(ifp, (u_int8_t *)randid,
1928 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) {
1929 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find a good "
1933 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
1934 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
1935 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
1936 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
1939 * in6_get_tmpifid() quite likely provided a unique interface ID.
1940 * However, we may still have a chance to see collision, because
1941 * there may be a time lag between generation of the ID and generation
1942 * of the address. So, we'll do one more sanity check.
1945 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
1946 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
1947 &ifra.ifra_addr.sin6_addr)) {
1948 if (trylimit-- == 0) {
1949 IN6_IFADDR_RUNLOCK();
1951 * Give up. Something strange should have
1954 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to "
1955 "find a unique random IFID\n"));
1958 IN6_IFADDR_RUNLOCK();
1963 IN6_IFADDR_RUNLOCK();
1966 * The Valid Lifetime is the lower of the Valid Lifetime of the
1967 * public address or TEMP_VALID_LIFETIME.
1968 * The Preferred Lifetime is the lower of the Preferred Lifetime
1969 * of the public address or TEMP_PREFERRED_LIFETIME -
1972 if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1973 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
1974 (ia0->ia6_lifetime.ia6t_vltime -
1975 (time_second - ia0->ia6_updatetime));
1976 if (vltime0 > V_ip6_temp_valid_lifetime)
1977 vltime0 = V_ip6_temp_valid_lifetime;
1979 vltime0 = V_ip6_temp_valid_lifetime;
1980 if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1981 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
1982 (ia0->ia6_lifetime.ia6t_pltime -
1983 (time_second - ia0->ia6_updatetime));
1984 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){
1985 pltime0 = V_ip6_temp_preferred_lifetime -
1986 V_ip6_desync_factor;
1989 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor;
1990 ifra.ifra_lifetime.ia6t_vltime = vltime0;
1991 ifra.ifra_lifetime.ia6t_pltime = pltime0;
1994 * A temporary address is created only if this calculated Preferred
1995 * Lifetime is greater than REGEN_ADVANCE time units.
1997 if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance)
2000 /* XXX: scope zone ID? */
2002 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
2004 /* allocate ifaddr structure, link into chain, etc. */
2007 updateflags |= IN6_IFAUPDATE_DADDELAY;
2008 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0)
2011 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
2012 if (newia == NULL) { /* XXX: can it happen? */
2014 "in6_tmpifadd: ifa update succeeded, but we got "
2016 return (EINVAL); /* XXX */
2018 newia->ia6_ndpr = ia0->ia6_ndpr;
2019 newia->ia6_ndpr->ndpr_refcnt++;
2020 ifa_free(&newia->ia_ifa);
2023 * A newly added address might affect the status of other addresses.
2024 * XXX: when the temporary address is generated with a new public
2025 * address, the onlink check is redundant. However, it would be safe
2026 * to do the check explicitly everywhere a new address is generated,
2027 * and, in fact, we surely need the check when we create a new
2028 * temporary address due to deprecation of an old temporary address.
2030 pfxlist_onlink_check();
2036 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
2038 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
2039 ndpr->ndpr_preferred = 0;
2041 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime;
2042 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
2043 ndpr->ndpr_expire = 0;
2045 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime;
2051 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
2053 /* init ia6t_expire */
2054 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
2055 lt6->ia6t_expire = 0;
2057 lt6->ia6t_expire = time_second;
2058 lt6->ia6t_expire += lt6->ia6t_vltime;
2061 /* init ia6t_preferred */
2062 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
2063 lt6->ia6t_preferred = 0;
2065 lt6->ia6t_preferred = time_second;
2066 lt6->ia6t_preferred += lt6->ia6t_pltime;
2071 * Delete all the routing table entries that use the specified gateway.
2072 * XXX: this function causes search through all entries of routing table, so
2073 * it shouldn't be called when acting as a router.
2076 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
2078 struct radix_node_head *rnh;
2081 /* We'll care only link-local addresses */
2082 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) {
2087 rnh = rt_tables_get_rnh(0, AF_INET6);
2091 RADIX_NODE_HEAD_LOCK(rnh);
2092 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
2093 RADIX_NODE_HEAD_UNLOCK(rnh);
2098 rt6_deleteroute(struct radix_node *rn, void *arg)
2100 #define SIN6(s) ((struct sockaddr_in6 *)s)
2101 struct rtentry *rt = (struct rtentry *)rn;
2102 struct in6_addr *gate = (struct in6_addr *)arg;
2104 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
2107 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) {
2112 * Do not delete a static route.
2113 * XXX: this seems to be a bit ad-hoc. Should we consider the
2114 * 'cloned' bit instead?
2116 if ((rt->rt_flags & RTF_STATIC) != 0)
2120 * We delete only host route. This means, in particular, we don't
2121 * delete default route.
2123 if ((rt->rt_flags & RTF_HOST) == 0)
2126 return (rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
2127 rt_mask(rt), rt->rt_flags, 0));
2132 nd6_setdefaultiface(int ifindex)
2136 if (ifindex < 0 || V_if_index < ifindex)
2138 if (ifindex != 0 && !ifnet_byindex(ifindex))
2141 if (V_nd6_defifindex != ifindex) {
2142 V_nd6_defifindex = ifindex;
2143 if (V_nd6_defifindex > 0)
2144 V_nd6_defifp = ifnet_byindex(V_nd6_defifindex);
2146 V_nd6_defifp = NULL;
2149 * Our current implementation assumes one-to-one maping between
2150 * interfaces and links, so it would be natural to use the
2151 * default interface as the default link.
2153 scope6_setdefault(V_nd6_defifp);