1 /* $FreeBSD: src/sys/netinet6/nd6_rtr.c,v 1.2.2.5 2003/04/05 10:28:53 ume Exp $ */
2 /* $DragonFly: src/sys/netinet6/nd6_rtr.c,v 1.9 2005/03/04 03:05:59 hsu Exp $ */
3 /* $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $ */
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include "opt_inet6.h"
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/malloc.h>
41 #include <sys/socket.h>
42 #include <sys/sockio.h>
44 #include <sys/kernel.h>
45 #include <sys/errno.h>
46 #include <sys/syslog.h>
47 #include <sys/queue.h>
50 #include <net/if_types.h>
51 #include <net/if_dl.h>
52 #include <net/route.h>
53 #include <net/radix.h>
55 #include <netinet/in.h>
56 #include <netinet6/in6_var.h>
57 #include <netinet6/in6_ifattach.h>
58 #include <netinet/ip6.h>
59 #include <netinet6/ip6_var.h>
60 #include <netinet6/nd6.h>
61 #include <netinet/icmp6.h>
62 #include <netinet6/scope6_var.h>
64 #include <net/net_osdep.h>
66 #define SDL(s) ((struct sockaddr_dl *)s)
68 static struct nd_defrouter *defrtrlist_update (struct nd_defrouter *);
69 static struct in6_ifaddr *in6_ifadd (struct nd_prefix *,
71 static struct nd_pfxrouter *pfxrtr_lookup (struct nd_prefix *,
72 struct nd_defrouter *);
73 static void pfxrtr_add (struct nd_prefix *, struct nd_defrouter *);
74 static void pfxrtr_del (struct nd_pfxrouter *);
75 static struct nd_pfxrouter *find_pfxlist_reachable_router
77 static void defrouter_addifreq (struct ifnet *);
78 static void nd6_rtmsg (int, struct rtentry *);
80 static void in6_init_address_ltimes (struct nd_prefix *ndpr,
81 struct in6_addrlifetime *lt6);
83 static int rt6_deleteroute (struct radix_node *, void *);
85 extern int nd6_recalc_reachtm_interval;
87 static struct ifnet *nd6_defifp;
90 int ip6_use_tempaddr = 0;
92 int ip6_desync_factor;
93 u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME;
94 u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME;
96 * shorter lifetimes for debugging purposes.
97 int ip6_temp_preferred_lifetime = 800;
98 static int ip6_temp_valid_lifetime = 1800;
100 int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE;
103 * Receive Router Solicitation Message - just for routers.
104 * Router solicitation/advertisement is mostly managed by userland program
105 * (rtadvd) so here we have no function like nd6_ra_output().
110 nd6_rs_input(m, off, icmp6len)
114 struct ifnet *ifp = m->m_pkthdr.rcvif;
115 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
116 struct nd_router_solicit *nd_rs;
117 struct in6_addr saddr6 = ip6->ip6_src;
119 struct in6_addr daddr6 = ip6->ip6_dst;
124 struct sockaddr_dl *sdl = (struct sockaddr_dl *)NULL;
125 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL;
126 struct rtentry *rt = NULL;
129 union nd_opts ndopts;
131 /* If I'm not a router, ignore it. */
132 if (ip6_accept_rtadv != 0 || ip6_forwarding != 1)
136 if (ip6->ip6_hlim != 255) {
138 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
139 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
140 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
145 * Don't update the neighbor cache, if src = ::.
146 * This indicates that the src has no IP address assigned yet.
148 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
151 #ifndef PULLDOWN_TEST
152 IP6_EXTHDR_CHECK(m, off, icmp6len,);
153 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
155 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
157 icmp6stat.icp6s_tooshort++;
162 icmp6len -= sizeof(*nd_rs);
163 nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
164 if (nd6_options(&ndopts) < 0) {
166 "nd6_rs_input: invalid ND option, ignored\n"));
167 /* nd6_options have incremented stats */
171 if (ndopts.nd_opts_src_lladdr) {
172 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
173 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
176 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
178 "nd6_rs_input: lladdrlen mismatch for %s "
179 "(if %d, RS packet %d)\n",
180 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
184 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
191 icmp6stat.icp6s_badrs++;
196 * Receive Router Advertisement Message.
199 * TODO: on-link bit on prefix information
200 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
203 nd6_ra_input(m, off, icmp6len)
207 struct ifnet *ifp = m->m_pkthdr.rcvif;
208 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
209 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
210 struct nd_router_advert *nd_ra;
211 struct in6_addr saddr6 = ip6->ip6_src;
213 struct in6_addr daddr6 = ip6->ip6_dst;
214 int flags; /* = nd_ra->nd_ra_flags_reserved; */
215 int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0);
216 int is_other = ((flags & ND_RA_FLAG_OTHER) != 0);
218 union nd_opts ndopts;
219 struct nd_defrouter *dr;
222 * We only accept RAs only when
223 * the system-wide variable allows the acceptance, and
224 * per-interface variable allows RAs on the receiving interface.
226 if (ip6_accept_rtadv == 0)
228 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
231 if (ip6->ip6_hlim != 255) {
233 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
234 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
235 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
239 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
241 "nd6_ra_input: src %s is not link-local\n",
242 ip6_sprintf(&saddr6)));
246 #ifndef PULLDOWN_TEST
247 IP6_EXTHDR_CHECK(m, off, icmp6len,);
248 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
250 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
252 icmp6stat.icp6s_tooshort++;
257 icmp6len -= sizeof(*nd_ra);
258 nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
259 if (nd6_options(&ndopts) < 0) {
261 "nd6_ra_input: invalid ND option, ignored\n"));
262 /* nd6_options have incremented stats */
267 struct nd_defrouter dr0;
268 u_int32_t advreachable = nd_ra->nd_ra_reachable;
271 dr0.flags = nd_ra->nd_ra_flags_reserved;
272 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
273 dr0.expire = time_second + dr0.rtlifetime;
275 dr0.advint = 0; /* Mobile IPv6 */
276 dr0.advint_expire = 0; /* Mobile IPv6 */
277 dr0.advints_lost = 0; /* Mobile IPv6 */
278 /* unspecified or not? (RFC 2461 6.3.4) */
280 advreachable = ntohl(advreachable);
281 if (advreachable <= MAX_REACHABLE_TIME &&
282 ndi->basereachable != advreachable) {
283 ndi->basereachable = advreachable;
284 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
285 ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */
288 if (nd_ra->nd_ra_retransmit)
289 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
290 if (nd_ra->nd_ra_curhoplimit)
291 ndi->chlim = nd_ra->nd_ra_curhoplimit;
292 dr = defrtrlist_update(&dr0);
298 if (ndopts.nd_opts_pi) {
299 struct nd_opt_hdr *pt;
300 struct nd_opt_prefix_info *pi = NULL;
303 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
304 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
305 pt = (struct nd_opt_hdr *)((caddr_t)pt +
306 (pt->nd_opt_len << 3))) {
307 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
309 pi = (struct nd_opt_prefix_info *)pt;
311 if (pi->nd_opt_pi_len != 4) {
313 "nd6_ra_input: invalid option "
314 "len %d for prefix information option, "
315 "ignored\n", pi->nd_opt_pi_len));
319 if (128 < pi->nd_opt_pi_prefix_len) {
321 "nd6_ra_input: invalid prefix "
322 "len %d for prefix information option, "
323 "ignored\n", pi->nd_opt_pi_prefix_len));
327 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
328 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
330 "nd6_ra_input: invalid prefix "
332 ip6_sprintf(&pi->nd_opt_pi_prefix)));
336 /* aggregatable unicast address, rfc2374 */
337 if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20
338 && pi->nd_opt_pi_prefix_len != 64) {
340 "nd6_ra_input: invalid prefixlen "
341 "%d for rfc2374 prefix %s, ignored\n",
342 pi->nd_opt_pi_prefix_len,
343 ip6_sprintf(&pi->nd_opt_pi_prefix)));
347 bzero(&pr, sizeof(pr));
348 pr.ndpr_prefix.sin6_family = AF_INET6;
349 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
350 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
351 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
353 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
354 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
355 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
356 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
357 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
358 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
360 ntohl(pi->nd_opt_pi_preferred_time);
362 if (in6_init_prefix_ltimes(&pr))
363 continue; /* prefix lifetime init failed */
365 prelist_update(&pr, dr, m);
372 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
373 u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
376 if (mtu < IPV6_MMTU) {
377 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
378 "mtu=%d sent from %s, ignoring\n",
379 mtu, ip6_sprintf(&ip6->ip6_src)));
385 if (mtu <= ndi->maxmtu) {
386 int change = (ndi->linkmtu != mtu);
389 if (change) /* in6_maxmtu may change */
392 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
393 "mtu=%d sent from %s; "
394 "exceeds maxmtu %d, ignoring\n",
395 mtu, ip6_sprintf(&ip6->ip6_src),
399 nd6log((LOG_INFO, "nd6_ra_input: mtu option "
400 "mtu=%d sent from %s; maxmtu unknown, "
402 mtu, ip6_sprintf(&ip6->ip6_src)));
409 * Source link layer address
415 if (ndopts.nd_opts_src_lladdr) {
416 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
417 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
420 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
422 "nd6_ra_input: lladdrlen mismatch for %s "
423 "(if %d, RA packet %d)\n",
424 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
428 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0);
431 * Installing a link-layer address might change the state of the
432 * router's neighbor cache, which might also affect our on-link
433 * detection of adveritsed prefixes.
435 pfxlist_onlink_check();
443 icmp6stat.icp6s_badra++;
448 * default router list proccessing sub routines
451 /* tell the change to user processes watching the routing socket. */
457 struct rt_addrinfo info;
459 bzero((caddr_t)&info, sizeof(info));
460 info.rti_info[RTAX_DST] = rt_key(rt);
461 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
462 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
463 info.rti_info[RTAX_IFP] =
464 (struct sockaddr *)TAILQ_FIRST(&rt->rt_ifp->if_addrlist);
465 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
467 rt_missmsg(cmd, &info, rt->rt_flags, 0);
471 defrouter_addreq(new)
472 struct nd_defrouter *new;
474 struct sockaddr_in6 def, mask, gate;
475 struct rtentry *newrt = NULL;
478 bzero(&def, sizeof(def));
479 bzero(&mask, sizeof(mask));
480 bzero(&gate, sizeof(gate));
482 def.sin6_len = mask.sin6_len = gate.sin6_len
483 = sizeof(struct sockaddr_in6);
484 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
485 gate.sin6_addr = new->rtaddr;
488 rtrequest(RTM_ADD, (struct sockaddr *)&def, (struct sockaddr *)&gate,
489 (struct sockaddr *)&mask, RTF_GATEWAY, &newrt);
491 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
498 /* Add a route to a given interface as default */
500 defrouter_addifreq(ifp)
503 struct sockaddr_in6 def, mask;
505 struct rtentry *newrt = NULL;
508 bzero(&def, sizeof(def));
509 bzero(&mask, sizeof(mask));
511 def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6);
512 def.sin6_family = mask.sin6_family = AF_INET6;
515 * Search for an ifaddr beloging to the specified interface.
516 * XXX: An IPv6 address are required to be assigned on the interface.
518 if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) {
519 nd6log((LOG_ERR, /* better error? */
520 "defrouter_addifreq: failed to find an ifaddr "
521 "to install a route to interface %s\n",
526 flags = ifa->ifa_flags;
527 error = rtrequest(RTM_ADD, (struct sockaddr *)&def, ifa->ifa_addr,
528 (struct sockaddr *)&mask, flags, &newrt);
531 "defrouter_addifreq: failed to install a route to "
532 "interface %s (errno = %d)\n",
533 if_name(ifp), error));
535 if (newrt) /* maybe unnecessary, but do it for safety */
539 nd6_rtmsg(RTM_ADD, newrt);
545 struct nd_defrouter *
546 defrouter_lookup(addr, ifp)
547 struct in6_addr *addr;
550 struct nd_defrouter *dr;
552 for (dr = TAILQ_FIRST(&nd_defrouter); dr;
553 dr = TAILQ_NEXT(dr, dr_entry)) {
554 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
558 return(NULL); /* search failed */
562 defrouter_delreq(dr, dofree)
563 struct nd_defrouter *dr;
566 struct sockaddr_in6 def, mask, gate;
567 struct rtentry *oldrt = NULL;
569 bzero(&def, sizeof(def));
570 bzero(&mask, sizeof(mask));
571 bzero(&gate, sizeof(gate));
573 def.sin6_len = mask.sin6_len = gate.sin6_len
574 = sizeof(struct sockaddr_in6);
575 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
576 gate.sin6_addr = dr->rtaddr;
578 rtrequest(RTM_DELETE, (struct sockaddr *)&def,
579 (struct sockaddr *)&gate,
580 (struct sockaddr *)&mask,
581 RTF_GATEWAY, &oldrt);
583 nd6_rtmsg(RTM_DELETE, oldrt);
584 if (oldrt->rt_refcnt <= 0) {
586 * XXX: borrowed from the RTM_DELETE case of
594 if (dofree) /* XXX: necessary? */
600 struct nd_defrouter *dr;
602 struct nd_defrouter *deldr = NULL;
603 struct nd_prefix *pr;
606 * Flush all the routing table entries that use the router
609 if (!ip6_forwarding && ip6_accept_rtadv) {
610 /* above is a good condition? */
611 rt6_flush(&dr->rtaddr, dr->ifp);
614 if (dr == TAILQ_FIRST(&nd_defrouter))
615 deldr = dr; /* The router is primary. */
617 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
620 * Also delete all the pointers to the router in each prefix lists.
622 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
623 struct nd_pfxrouter *pfxrtr;
624 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
627 pfxlist_onlink_check();
630 * If the router is the primary one, choose a new one.
631 * Note that defrouter_select() will remove the current gateway
632 * from the routing table.
641 * Default Router Selection according to Section 6.3.6 of RFC 2461:
642 * 1) Routers that are reachable or probably reachable should be
644 * 2) When no routers on the list are known to be reachable or
645 * probably reachable, routers SHOULD be selected in a round-robin
647 * 3) If the Default Router List is empty, assume that all
648 * destinations are on-link.
654 struct nd_defrouter *dr, anydr;
655 struct rtentry *rt = NULL;
656 struct llinfo_nd6 *ln = NULL;
659 * Search for a (probably) reachable router from the list.
661 for (dr = TAILQ_FIRST(&nd_defrouter); dr;
662 dr = TAILQ_NEXT(dr, dr_entry)) {
663 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
664 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
665 ND6_IS_LLINFO_PROBREACH(ln)) {
666 /* Got it, and move it to the head */
667 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
668 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry);
673 if ((dr = TAILQ_FIRST(&nd_defrouter))) {
675 * De-install the previous default gateway and install
677 * Note that if there is no reachable router in the list,
678 * the head entry will be used anyway.
679 * XXX: do we have to check the current routing table entry?
681 bzero(&anydr, sizeof(anydr));
682 defrouter_delreq(&anydr, 0);
683 defrouter_addreq(dr);
687 * The Default Router List is empty, so install the default
688 * route to an inteface.
689 * XXX: The specification does not say this mechanism should
690 * be restricted to hosts, but this would be not useful
691 * (even harmful) for routers.
693 if (!ip6_forwarding) {
695 * De-install the current default route
698 bzero(&anydr, sizeof(anydr));
699 defrouter_delreq(&anydr, 0);
702 * Install a route to the default interface
704 * XXX: we enable this for host only, because
705 * this may override a default route installed
706 * a user process (e.g. routing daemon) in a
709 defrouter_addifreq(nd6_defifp);
711 nd6log((LOG_INFO, "defrouter_select: "
712 "there's no default router and no default"
722 static struct nd_defrouter *
723 defrtrlist_update(new)
724 struct nd_defrouter *new;
726 struct nd_defrouter *dr, *n;
729 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
731 if (new->rtlifetime == 0) {
736 dr->flags = new->flags; /* xxx flag check */
737 dr->rtlifetime = new->rtlifetime;
738 dr->expire = new->expire;
744 /* entry does not exist */
745 if (new->rtlifetime == 0) {
750 n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
755 bzero(n, sizeof(*n));
759 * Insert the new router at the end of the Default Router List.
760 * If there is no other router, install it anyway. Otherwise,
761 * just continue to use the current default router.
763 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry);
764 if (TAILQ_FIRST(&nd_defrouter) == n)
771 static struct nd_pfxrouter *
772 pfxrtr_lookup(pr, dr)
773 struct nd_prefix *pr;
774 struct nd_defrouter *dr;
776 struct nd_pfxrouter *search;
778 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
779 if (search->router == dr)
788 struct nd_prefix *pr;
789 struct nd_defrouter *dr;
791 struct nd_pfxrouter *new;
793 new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
796 bzero(new, sizeof(*new));
799 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
801 pfxlist_onlink_check();
806 struct nd_pfxrouter *pfr;
808 LIST_REMOVE(pfr, pfr_entry);
813 nd6_prefix_lookup(pr)
814 struct nd_prefix *pr;
816 struct nd_prefix *search;
818 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) {
819 if (pr->ndpr_ifp == search->ndpr_ifp &&
820 pr->ndpr_plen == search->ndpr_plen &&
821 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
822 &search->ndpr_prefix.sin6_addr,
833 nd6_prelist_add(pr, dr, newp)
834 struct nd_prefix *pr, **newp;
835 struct nd_defrouter *dr;
837 struct nd_prefix *new = NULL;
840 new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
843 bzero(new, sizeof(*new));
849 LIST_INIT(&new->ndpr_advrtrs);
850 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
851 /* make prefix in the canonical form */
852 for (i = 0; i < 4; i++)
853 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
854 new->ndpr_mask.s6_addr32[i];
857 /* link ndpr_entry to nd_prefix list */
858 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry);
861 /* ND_OPT_PI_FLAG_ONLINK processing */
862 if (new->ndpr_raf_onlink) {
865 if ((e = nd6_prefix_onlink(new)) != 0) {
866 nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
867 "the prefix %s/%d on-link on %s (errno=%d)\n",
868 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
869 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
870 /* proceed anyway. XXX: is it correct? */
883 struct nd_prefix *pr;
885 struct nd_pfxrouter *pfr, *next;
888 /* make sure to invalidate the prefix until it is really freed. */
893 * Though these flags are now meaningless, we'd rather keep the value
894 * not to confuse users when executing "ndp -p".
896 pr->ndpr_raf_onlink = 0;
897 pr->ndpr_raf_auto = 0;
899 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
900 (e = nd6_prefix_offlink(pr)) != 0) {
901 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
903 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
904 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
905 /* what should we do? */
908 if (pr->ndpr_refcnt > 0)
909 return; /* notice here? */
913 /* unlink ndpr_entry from nd_prefix list */
914 LIST_REMOVE(pr, ndpr_entry);
916 /* free list of routers that adversed the prefix */
917 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
918 next = pfr->pfr_next;
926 pfxlist_onlink_check();
930 prelist_update(new, dr, m)
931 struct nd_prefix *new;
932 struct nd_defrouter *dr; /* may be NULL */
935 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
937 struct ifnet *ifp = new->ndpr_ifp;
938 struct nd_prefix *pr;
943 struct in6_addrlifetime lt6_tmp;
948 * Authenticity for NA consists authentication for
949 * both IP header and IP datagrams, doesn't it ?
951 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
952 auth = (m->m_flags & M_AUTHIPHDR
953 && m->m_flags & M_AUTHIPDGM) ? 1 : 0;
958 if ((pr = nd6_prefix_lookup(new)) != NULL) {
960 * nd6_prefix_lookup() ensures that pr and new have the same
961 * prefix on a same interface.
965 * Update prefix information. Note that the on-link (L) bit
966 * and the autonomous (A) bit should NOT be changed from 1
969 if (new->ndpr_raf_onlink == 1)
970 pr->ndpr_raf_onlink = 1;
971 if (new->ndpr_raf_auto == 1)
972 pr->ndpr_raf_auto = 1;
973 if (new->ndpr_raf_onlink) {
974 pr->ndpr_vltime = new->ndpr_vltime;
975 pr->ndpr_pltime = new->ndpr_pltime;
976 pr->ndpr_preferred = new->ndpr_preferred;
977 pr->ndpr_expire = new->ndpr_expire;
980 if (new->ndpr_raf_onlink &&
981 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
984 if ((e = nd6_prefix_onlink(pr)) != 0) {
986 "prelist_update: failed to make "
987 "the prefix %s/%d on-link on %s "
989 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
990 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
991 /* proceed anyway. XXX: is it correct? */
995 if (dr && pfxrtr_lookup(pr, dr) == NULL)
998 struct nd_prefix *newpr = NULL;
1002 if (new->ndpr_vltime == 0)
1004 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
1007 bzero(&new->ndpr_addr, sizeof(struct in6_addr));
1009 error = nd6_prelist_add(new, dr, &newpr);
1010 if (error != 0 || newpr == NULL) {
1011 nd6log((LOG_NOTICE, "prelist_update: "
1012 "nd6_prelist_add failed for %s/%d on %s "
1013 "errno=%d, returnpr=%p\n",
1014 ip6_sprintf(&new->ndpr_prefix.sin6_addr),
1015 new->ndpr_plen, if_name(new->ndpr_ifp),
1017 goto end; /* we should just give up in this case. */
1021 * XXX: from the ND point of view, we can ignore a prefix
1022 * with the on-link bit being zero. However, we need a
1023 * prefix structure for references from autoconfigured
1024 * addresses. Thus, we explicitly make suret that the prefix
1025 * itself expires now.
1027 if (newpr->ndpr_raf_onlink == 0) {
1028 newpr->ndpr_vltime = 0;
1029 newpr->ndpr_pltime = 0;
1030 in6_init_prefix_ltimes(newpr);
1037 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1038 * Note that pr must be non NULL at this point.
1041 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1042 if (!new->ndpr_raf_auto)
1046 * 5.5.3 (b). the link-local prefix should have been ignored in
1051 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
1052 * This should have been done in nd6_ra_input.
1056 * 5.5.3 (d). If the prefix advertised does not match the prefix of an
1057 * address already in the list, and the Valid Lifetime is not 0,
1058 * form an address. Note that even a manually configured address
1059 * should reject autoconfiguration of a new address.
1061 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1063 struct in6_ifaddr *ifa6;
1065 u_int32_t storedlifetime;
1067 if (ifa->ifa_addr->sa_family != AF_INET6)
1070 ifa6 = (struct in6_ifaddr *)ifa;
1073 * Spec is not clear here, but I believe we should concentrate
1074 * on unicast (i.e. not anycast) addresses.
1075 * XXX: other ia6_flags? detached or duplicated?
1077 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
1080 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL);
1081 if (ifa_plen != new->ndpr_plen ||
1082 !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr,
1083 &new->ndpr_prefix.sin6_addr,
1087 if (ia6_match == NULL) /* remember the first one */
1090 if ((ifa6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1094 * An already autoconfigured address matched. Now that we
1095 * are sure there is at least one matched address, we can
1096 * proceed to 5.5.3. (e): update the lifetimes according to the
1097 * "two hours" rule and the privacy extension.
1099 #define TWOHOUR (120*60)
1100 lt6_tmp = ifa6->ia6_lifetime;
1102 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1103 storedlifetime = ND6_INFINITE_LIFETIME;
1104 else if (IFA6_IS_INVALID(ifa6))
1107 storedlifetime = lt6_tmp.ia6t_expire - time_second;
1109 /* when not updating, keep the current stored lifetime. */
1110 lt6_tmp.ia6t_vltime = storedlifetime;
1112 if (TWOHOUR < new->ndpr_vltime ||
1113 storedlifetime < new->ndpr_vltime) {
1114 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1115 } else if (storedlifetime <= TWOHOUR
1118 * This condition is logically redundant, so we just
1120 * See IPng 6712, 6717, and 6721.
1122 && new->ndpr_vltime <= storedlifetime
1126 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1130 * new->ndpr_vltime <= TWOHOUR &&
1131 * TWOHOUR < storedlifetime
1133 lt6_tmp.ia6t_vltime = TWOHOUR;
1136 /* The 2 hour rule is not imposed for preferred lifetime. */
1137 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1139 in6_init_address_ltimes(pr, <6_tmp);
1142 * When adjusting the lifetimes of an existing temporary
1143 * address, only lower the lifetimes.
1144 * RFC 3041 3.3. (1).
1145 * XXX: how should we modify ia6t_[pv]ltime?
1147 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
1148 if (lt6_tmp.ia6t_expire == 0 || /* no expire */
1149 lt6_tmp.ia6t_expire >
1150 ifa6->ia6_lifetime.ia6t_expire) {
1151 lt6_tmp.ia6t_expire =
1152 ifa6->ia6_lifetime.ia6t_expire;
1154 if (lt6_tmp.ia6t_preferred == 0 || /* no expire */
1155 lt6_tmp.ia6t_preferred >
1156 ifa6->ia6_lifetime.ia6t_preferred) {
1157 lt6_tmp.ia6t_preferred =
1158 ifa6->ia6_lifetime.ia6t_preferred;
1162 ifa6->ia6_lifetime = lt6_tmp;
1164 if (ia6_match == NULL && new->ndpr_vltime) {
1166 * No address matched and the valid lifetime is non-zero.
1167 * Create a new address.
1169 if ((ia6 = in6_ifadd(new, NULL)) != NULL) {
1171 * note that we should use pr (not new) for reference.
1177 /* XXXYYY Don't do this, according to Jinmei. */
1178 pr->ndpr_addr = new->ndpr_addr;
1183 * When a new public address is created as described
1184 * in RFC2462, also create a new temporary address.
1187 * When an interface connects to a new link, a new
1188 * randomized interface identifier should be generated
1189 * immediately together with a new set of temporary
1190 * addresses. Thus, we specifiy 1 as the 2nd arg of
1193 if (ip6_use_tempaddr) {
1195 if ((e = in6_tmpifadd(ia6, 1)) != 0) {
1196 nd6log((LOG_NOTICE, "prelist_update: "
1197 "failed to create a temporary "
1198 "address, errno=%d\n",
1204 * A newly added address might affect the status
1205 * of other addresses, so we check and update it.
1206 * XXX: what if address duplication happens?
1208 pfxlist_onlink_check();
1210 /* just set an error. do not bark here. */
1211 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1223 * A supplement function used in the on-link detection below;
1224 * detect if a given prefix has a (probably) reachable advertising router.
1225 * XXX: lengthy function name...
1227 static struct nd_pfxrouter *
1228 find_pfxlist_reachable_router(pr)
1229 struct nd_prefix *pr;
1231 struct nd_pfxrouter *pfxrtr;
1233 struct llinfo_nd6 *ln;
1235 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr;
1236 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
1237 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0,
1238 pfxrtr->router->ifp)) &&
1239 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
1240 ND6_IS_LLINFO_PROBREACH(ln))
1249 * Check if each prefix in the prefix list has at least one available router
1250 * that advertised the prefix (a router is "available" if its neighbor cache
1251 * entry is reachable or probably reachable).
1252 * If the check fails, the prefix may be off-link, because, for example,
1253 * we have moved from the network but the lifetime of the prefix has not
1254 * expired yet. So we should not use the prefix if there is another prefix
1255 * that has an available router.
1256 * But, if there is no prefix that has an available router, we still regards
1257 * all the prefixes as on-link. This is because we can't tell if all the
1258 * routers are simply dead or if we really moved from the network and there
1259 * is no router around us.
1262 pfxlist_onlink_check()
1264 struct nd_prefix *pr;
1265 struct in6_ifaddr *ifa;
1268 * Check if there is a prefix that has a reachable advertising
1271 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1272 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1278 * There is at least one prefix that has a reachable router.
1279 * Detach prefixes which have no reachable advertising
1280 * router, and attach other prefixes.
1282 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1283 /* XXX: a link-local prefix should never be detached */
1284 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1288 * we aren't interested in prefixes without the L bit
1291 if (pr->ndpr_raf_onlink == 0)
1294 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1295 find_pfxlist_reachable_router(pr) == NULL)
1296 pr->ndpr_stateflags |= NDPRF_DETACHED;
1297 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1298 find_pfxlist_reachable_router(pr) != 0)
1299 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1302 /* there is no prefix that has a reachable router */
1303 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1304 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1307 if (pr->ndpr_raf_onlink == 0)
1310 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1311 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1316 * Remove each interface route associated with a (just) detached
1317 * prefix, and reinstall the interface route for a (just) attached
1318 * prefix. Note that all attempt of reinstallation does not
1319 * necessarily success, when a same prefix is shared among multiple
1320 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1321 * so we don't have to care about them.
1323 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1326 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1329 if (pr->ndpr_raf_onlink == 0)
1332 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1333 (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1334 if ((e = nd6_prefix_offlink(pr)) != 0) {
1336 "pfxlist_onlink_check: failed to "
1337 "make %s/%d offlink, errno=%d\n",
1338 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1342 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1343 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 &&
1344 pr->ndpr_raf_onlink) {
1345 if ((e = nd6_prefix_onlink(pr)) != 0) {
1347 "pfxlist_onlink_check: failed to "
1348 "make %s/%d offlink, errno=%d\n",
1349 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1356 * Changes on the prefix status might affect address status as well.
1357 * Make sure that all addresses derived from an attached prefix are
1358 * attached, and that all addresses derived from a detached prefix are
1359 * detached. Note, however, that a manually configured address should
1360 * always be attached.
1361 * The precise detection logic is same as the one for prefixes.
1363 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1364 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1367 if (ifa->ia6_ndpr == NULL) {
1369 * This can happen when we first configure the address
1370 * (i.e. the address exists, but the prefix does not).
1371 * XXX: complicated relationships...
1376 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1380 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1381 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1384 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1387 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1388 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1390 ifa->ia6_flags |= IN6_IFF_DETACHED;
1394 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1395 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1398 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1404 nd6_prefix_onlink(pr)
1405 struct nd_prefix *pr;
1408 struct ifnet *ifp = pr->ndpr_ifp;
1409 struct sockaddr_in6 mask6;
1410 struct nd_prefix *opr;
1413 struct rtentry *rt = NULL;
1416 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1418 "nd6_prefix_onlink: %s/%d is already on-link\n",
1419 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen);
1424 * Add the interface route associated with the prefix. Before
1425 * installing the route, check if there's the same prefix on another
1426 * interface, and the prefix has already installed the interface route.
1427 * Although such a configuration is expected to be rare, we explicitly
1430 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1434 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
1437 if (opr->ndpr_plen == pr->ndpr_plen &&
1438 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1439 &opr->ndpr_prefix.sin6_addr,
1445 * We prefer link-local addresses as the associated interface address.
1447 /* search for a link-local addr */
1448 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
1452 /* XXX: freebsd does not have ifa_ifwithaf */
1453 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1455 if (ifa->ifa_addr->sa_family == AF_INET6)
1458 /* should we care about ia6_flags? */
1462 * This can still happen, when, for example, we receive an RA
1463 * containing a prefix with the L bit set and the A bit clear,
1464 * after removing all IPv6 addresses on the receiving
1465 * interface. This should, of course, be rare though.
1468 "nd6_prefix_onlink: failed to find any ifaddr"
1469 " to add route for a prefix(%s/%d) on %s\n",
1470 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1471 pr->ndpr_plen, if_name(ifp)));
1476 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1477 * ifa->ifa_rtrequest = nd6_rtrequest;
1479 bzero(&mask6, sizeof(mask6));
1480 mask6.sin6_len = sizeof(mask6);
1481 mask6.sin6_addr = pr->ndpr_mask;
1482 rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP;
1483 if (nd6_need_cache(ifp)) {
1484 /* explicitly set in case ifa_flags does not set the flag. */
1485 rtflags |= RTF_CLONING;
1488 * explicitly clear the cloning bit in case ifa_flags sets it.
1490 rtflags &= ~RTF_CLONING;
1492 error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix,
1493 ifa->ifa_addr, (struct sockaddr *)&mask6,
1496 if (rt != NULL) /* this should be non NULL, though */
1497 nd6_rtmsg(RTM_ADD, rt);
1498 pr->ndpr_stateflags |= NDPRF_ONLINK;
1501 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a"
1502 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
1504 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1505 pr->ndpr_plen, if_name(ifp),
1506 ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
1507 ip6_sprintf(&mask6.sin6_addr), rtflags, error));
1517 nd6_prefix_offlink(pr)
1518 struct nd_prefix *pr;
1521 struct ifnet *ifp = pr->ndpr_ifp;
1522 struct nd_prefix *opr;
1523 struct sockaddr_in6 sa6, mask6;
1524 struct rtentry *rt = NULL;
1527 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1529 "nd6_prefix_offlink: %s/%d is already off-link\n",
1530 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen));
1534 bzero(&sa6, sizeof(sa6));
1535 sa6.sin6_family = AF_INET6;
1536 sa6.sin6_len = sizeof(sa6);
1537 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
1538 sizeof(struct in6_addr));
1539 bzero(&mask6, sizeof(mask6));
1540 mask6.sin6_family = AF_INET6;
1541 mask6.sin6_len = sizeof(sa6);
1542 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
1543 error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
1544 (struct sockaddr *)&mask6, 0, &rt);
1546 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
1548 /* report the route deletion to the routing socket. */
1550 nd6_rtmsg(RTM_DELETE, rt);
1553 * There might be the same prefix on another interface,
1554 * the prefix which could not be on-link just because we have
1555 * the interface route (see comments in nd6_prefix_onlink).
1556 * If there's one, try to make the prefix on-link on the
1559 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1563 if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
1567 * KAME specific: detached prefixes should not be
1570 if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1573 if (opr->ndpr_plen == pr->ndpr_plen &&
1574 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1575 &opr->ndpr_prefix.sin6_addr,
1579 if ((e = nd6_prefix_onlink(opr)) != 0) {
1581 "nd6_prefix_offlink: failed to "
1582 "recover a prefix %s/%d from %s "
1583 "to %s (errno = %d)\n",
1584 ip6_sprintf(&opr->ndpr_prefix.sin6_addr),
1585 opr->ndpr_plen, if_name(ifp),
1586 if_name(opr->ndpr_ifp), e));
1592 /* XXX: can we still set the NDPRF_ONLINK flag? */
1594 "nd6_prefix_offlink: failed to delete route: "
1595 "%s/%d on %s (errno = %d)\n",
1596 ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp),
1601 if (rt->rt_refcnt <= 0) {
1602 /* XXX: we should free the entry ourselves. */
1611 static struct in6_ifaddr *
1613 struct nd_prefix *pr;
1614 struct in6_addr *ifid; /* Mobile IPv6 addition */
1616 struct ifnet *ifp = pr->ndpr_ifp;
1618 struct in6_aliasreq ifra;
1619 struct in6_ifaddr *ia, *ib;
1621 struct in6_addr mask;
1622 int prefixlen = pr->ndpr_plen;
1624 in6_len2mask(&mask, prefixlen);
1627 * find a link-local address (will be interface ID).
1628 * Is it really mandatory? Theoretically, a global or a site-local
1629 * address can be configured without a link-local address, if we
1630 * have a unique interface identifier...
1632 * it is not mandatory to have a link-local address, we can generate
1633 * interface identifier on the fly. we do this because:
1634 * (1) it should be the easiest way to find interface identifier.
1635 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1636 * for multiple addresses on a single interface, and possible shortcut
1637 * of DAD. we omitted DAD for this reason in the past.
1638 * (3) a user can prevent autoconfiguration of global address
1639 * by removing link-local address by hand (this is partly because we
1640 * don't have other way to control the use of IPv6 on a interface.
1641 * this has been our design choice - cf. NRL's "ifconfig auto").
1642 * (4) it is easier to manage when an interface has addresses
1643 * with the same interface identifier, than to have multiple addresses
1644 * with different interface identifiers.
1646 * Mobile IPv6 addition: allow for caller to specify a wished interface
1647 * ID. This is to not break connections when moving addresses between
1650 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */
1652 ib = (struct in6_ifaddr *)ifa;
1656 #if 0 /* don't care link local addr state, and always do DAD */
1657 /* if link-local address is not eligible, do not autoconfigure. */
1658 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) {
1659 printf("in6_ifadd: link-local address not ready\n");
1664 /* prefixlen + ifidlen must be equal to 128 */
1665 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
1666 if (prefixlen != plen0) {
1667 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
1668 "(prefix=%d ifid=%d)\n",
1669 if_name(ifp), prefixlen, 128 - plen0));
1675 bzero(&ifra, sizeof(ifra));
1677 * in6_update_ifa() does not use ifra_name, but we accurately set it
1680 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1681 ifra.ifra_addr.sin6_family = AF_INET6;
1682 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
1684 bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr,
1685 sizeof(ifra.ifra_addr.sin6_addr));
1686 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
1687 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
1688 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
1689 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
1692 if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid))
1693 ifid = &ib->ia_addr.sin6_addr;
1694 ifra.ifra_addr.sin6_addr.s6_addr32[0]
1695 |= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]);
1696 ifra.ifra_addr.sin6_addr.s6_addr32[1]
1697 |= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]);
1698 ifra.ifra_addr.sin6_addr.s6_addr32[2]
1699 |= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]);
1700 ifra.ifra_addr.sin6_addr.s6_addr32[3]
1701 |= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]);
1703 /* new prefix mask. */
1704 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1705 ifra.ifra_prefixmask.sin6_family = AF_INET6;
1706 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
1707 sizeof(ifra.ifra_prefixmask.sin6_addr));
1711 * XXX: in6_init_address_ltimes would override these values later.
1712 * We should reconsider this logic.
1714 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
1715 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
1717 /* XXX: scope zone ID? */
1719 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
1721 * temporarily set the nopfx flag to avoid conflict.
1722 * XXX: we should reconsider the entire mechanism about prefix
1725 ifra.ifra_flags |= IN6_IFF_NOPFX;
1728 * keep the new address, regardless of the result of in6_update_ifa.
1729 * XXX: this address is now meaningless.
1730 * We should reconsider its role.
1732 pr->ndpr_addr = ifra.ifra_addr.sin6_addr;
1734 /* allocate ifaddr structure, link into chain, etc. */
1735 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
1737 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
1738 ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp),
1740 return(NULL); /* ifaddr must not have been allocated. */
1743 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1745 return(ia); /* this must NOT be NULL. */
1749 in6_tmpifadd(ia0, forcegen)
1750 const struct in6_ifaddr *ia0; /* corresponding public address */
1752 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
1753 struct in6_ifaddr *newia;
1754 struct in6_aliasreq ifra;
1756 int trylimit = 3; /* XXX: adhoc value */
1757 u_int32_t randid[2];
1758 time_t vltime0, pltime0;
1760 bzero(&ifra, sizeof(ifra));
1761 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1762 ifra.ifra_addr = ia0->ia_addr;
1763 /* copy prefix mask */
1764 ifra.ifra_prefixmask = ia0->ia_prefixmask;
1765 /* clear the old IFID */
1766 for (i = 0; i < 4; i++) {
1767 ifra.ifra_addr.sin6_addr.s6_addr32[i]
1768 &= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
1772 in6_get_tmpifid(ifp, (u_int8_t *)randid,
1773 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8],
1775 ifra.ifra_addr.sin6_addr.s6_addr32[2]
1776 |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
1777 ifra.ifra_addr.sin6_addr.s6_addr32[3]
1778 |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
1781 * If by chance the new temporary address is the same as an address
1782 * already assigned to the interface, generate a new randomized
1783 * interface identifier and repeat this step.
1786 if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) {
1787 if (trylimit-- == 0) {
1788 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find "
1789 "a unique random IFID\n"));
1797 * The Valid Lifetime is the lower of the Valid Lifetime of the
1798 * public address or TEMP_VALID_LIFETIME.
1799 * The Preferred Lifetime is the lower of the Preferred Lifetime
1800 * of the public address or TEMP_PREFERRED_LIFETIME -
1803 if (ia0->ia6_lifetime.ia6t_expire != 0) {
1804 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
1805 (ia0->ia6_lifetime.ia6t_expire - time_second);
1806 if (vltime0 > ip6_temp_valid_lifetime)
1807 vltime0 = ip6_temp_valid_lifetime;
1809 vltime0 = ip6_temp_valid_lifetime;
1810 if (ia0->ia6_lifetime.ia6t_preferred != 0) {
1811 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
1812 (ia0->ia6_lifetime.ia6t_preferred - time_second);
1813 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor) {
1814 pltime0 = ip6_temp_preferred_lifetime -
1818 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor;
1819 ifra.ifra_lifetime.ia6t_vltime = vltime0;
1820 ifra.ifra_lifetime.ia6t_pltime = pltime0;
1823 * A temporary address is created only if this calculated Preferred
1824 * Lifetime is greater than REGEN_ADVANCE time units.
1826 if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance)
1829 /* XXX: scope zone ID? */
1831 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
1833 /* allocate ifaddr structure, link into chain, etc. */
1834 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0)
1837 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1838 if (newia == NULL) { /* XXX: can it happen? */
1840 "in6_tmpifadd: ifa update succeeded, but we got "
1842 return(EINVAL); /* XXX */
1844 newia->ia6_ndpr = ia0->ia6_ndpr;
1845 newia->ia6_ndpr->ndpr_refcnt++;
1851 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
1853 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */
1854 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) {
1855 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime"
1856 "(%d) is greater than valid lifetime(%d)\n",
1857 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime));
1860 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
1861 ndpr->ndpr_preferred = 0;
1863 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime;
1864 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
1865 ndpr->ndpr_expire = 0;
1867 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime;
1873 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
1875 /* init ia6t_expire */
1876 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
1877 lt6->ia6t_expire = 0;
1879 lt6->ia6t_expire = time_second;
1880 lt6->ia6t_expire += lt6->ia6t_vltime;
1883 /* init ia6t_preferred */
1884 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
1885 lt6->ia6t_preferred = 0;
1887 lt6->ia6t_preferred = time_second;
1888 lt6->ia6t_preferred += lt6->ia6t_pltime;
1893 * Delete all the routing table entries that use the specified gateway.
1894 * XXX: this function causes search through all entries of routing table, so
1895 * it shouldn't be called when acting as a router.
1898 rt6_flush(gateway, ifp)
1899 struct in6_addr *gateway;
1902 struct radix_node_head *rnh = rt_tables[AF_INET6];
1905 /* We'll care only link-local addresses */
1906 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) {
1910 /* XXX: hack for KAME's link-local address kludge */
1911 gateway->s6_addr16[1] = htons(ifp->if_index);
1913 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
1918 rt6_deleteroute(rn, arg)
1919 struct radix_node *rn;
1922 #define SIN6(s) ((struct sockaddr_in6 *)s)
1923 struct rtentry *rt = (struct rtentry *)rn;
1924 struct in6_addr *gate = (struct in6_addr *)arg;
1926 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
1929 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr))
1933 * Do not delete a static route.
1934 * XXX: this seems to be a bit ad-hoc. Should we consider the
1935 * 'cloned' bit instead?
1937 if ((rt->rt_flags & RTF_STATIC) != 0)
1941 * We delete only host route. This means, in particular, we don't
1942 * delete default route.
1944 if ((rt->rt_flags & RTF_HOST) == 0)
1947 return(rtrequest(RTM_DELETE, rt_key(rt),
1948 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0));
1953 nd6_setdefaultiface(ifindex)
1958 if (ifindex < 0 || if_index < ifindex)
1961 if (nd6_defifindex != ifindex) {
1962 nd6_defifindex = ifindex;
1963 if (nd6_defifindex > 0)
1964 nd6_defifp = ifindex2ifnet[nd6_defifindex];
1969 * If the Default Router List is empty, install a route
1970 * to the specified interface as default or remove the default
1971 * route when the default interface becomes canceled.
1972 * The check for the queue is actually redundant, but
1973 * we do this here to avoid re-install the default route
1974 * if the list is NOT empty.
1976 if (TAILQ_FIRST(&nd_defrouter) == NULL)
1980 * Our current implementation assumes one-to-one maping between
1981 * interfaces and links, so it would be natural to use the
1982 * default interface as the default link.
1984 scope6_setdefault(nd6_defifp);