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 1.10 2005/06/03 19:56:08 eirikn 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>
48 #include <sys/thread2.h>
51 #include <net/if_types.h>
52 #include <net/if_dl.h>
53 #include <net/route.h>
54 #include <net/radix.h>
56 #include <netinet/in.h>
57 #include <netinet6/in6_var.h>
58 #include <netinet6/in6_ifattach.h>
59 #include <netinet/ip6.h>
60 #include <netinet6/ip6_var.h>
61 #include <netinet6/nd6.h>
62 #include <netinet/icmp6.h>
63 #include <netinet6/scope6_var.h>
65 #include <net/net_osdep.h>
67 #define SDL(s) ((struct sockaddr_dl *)s)
69 static struct nd_defrouter *defrtrlist_update (struct nd_defrouter *);
70 static struct in6_ifaddr *in6_ifadd (struct nd_prefix *,
72 static struct nd_pfxrouter *pfxrtr_lookup (struct nd_prefix *,
73 struct nd_defrouter *);
74 static void pfxrtr_add (struct nd_prefix *, struct nd_defrouter *);
75 static void pfxrtr_del (struct nd_pfxrouter *);
76 static struct nd_pfxrouter *find_pfxlist_reachable_router
78 static void defrouter_addifreq (struct ifnet *);
79 static void nd6_rtmsg (int, struct rtentry *);
81 static void in6_init_address_ltimes (struct nd_prefix *ndpr,
82 struct in6_addrlifetime *lt6);
84 static int rt6_deleteroute (struct radix_node *, void *);
86 extern int nd6_recalc_reachtm_interval;
88 static struct ifnet *nd6_defifp;
91 int ip6_use_tempaddr = 0;
93 int ip6_desync_factor;
94 u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME;
95 u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME;
97 * shorter lifetimes for debugging purposes.
98 int ip6_temp_preferred_lifetime = 800;
99 static int ip6_temp_valid_lifetime = 1800;
101 int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE;
104 * Receive Router Solicitation Message - just for routers.
105 * Router solicitation/advertisement is mostly managed by userland program
106 * (rtadvd) so here we have no function like nd6_ra_output().
111 nd6_rs_input(m, off, icmp6len)
115 struct ifnet *ifp = m->m_pkthdr.rcvif;
116 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
117 struct nd_router_solicit *nd_rs;
118 struct in6_addr saddr6 = ip6->ip6_src;
120 struct in6_addr daddr6 = ip6->ip6_dst;
125 struct sockaddr_dl *sdl = (struct sockaddr_dl *)NULL;
126 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL;
127 struct rtentry *rt = NULL;
130 union nd_opts ndopts;
132 /* If I'm not a router, ignore it. */
133 if (ip6_accept_rtadv != 0 || ip6_forwarding != 1)
137 if (ip6->ip6_hlim != 255) {
139 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
140 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
141 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
146 * Don't update the neighbor cache, if src = ::.
147 * This indicates that the src has no IP address assigned yet.
149 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
152 #ifndef PULLDOWN_TEST
153 IP6_EXTHDR_CHECK(m, off, icmp6len,);
154 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
156 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
158 icmp6stat.icp6s_tooshort++;
163 icmp6len -= sizeof(*nd_rs);
164 nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
165 if (nd6_options(&ndopts) < 0) {
167 "nd6_rs_input: invalid ND option, ignored\n"));
168 /* nd6_options have incremented stats */
172 if (ndopts.nd_opts_src_lladdr) {
173 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
174 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
177 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
179 "nd6_rs_input: lladdrlen mismatch for %s "
180 "(if %d, RS packet %d)\n",
181 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
185 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
192 icmp6stat.icp6s_badrs++;
197 * Receive Router Advertisement Message.
200 * TODO: on-link bit on prefix information
201 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
204 nd6_ra_input(m, off, 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 struct in6_addr daddr6 = ip6->ip6_dst;
215 int flags; /* = nd_ra->nd_ra_flags_reserved; */
216 int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0);
217 int is_other = ((flags & ND_RA_FLAG_OTHER) != 0);
219 union nd_opts ndopts;
220 struct nd_defrouter *dr;
223 * We only accept RAs only when
224 * the system-wide variable allows the acceptance, and
225 * per-interface variable allows RAs on the receiving interface.
227 if (ip6_accept_rtadv == 0)
229 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
232 if (ip6->ip6_hlim != 255) {
234 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
235 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
236 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
240 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
242 "nd6_ra_input: src %s is not link-local\n",
243 ip6_sprintf(&saddr6)));
247 #ifndef PULLDOWN_TEST
248 IP6_EXTHDR_CHECK(m, off, icmp6len,);
249 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
251 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
253 icmp6stat.icp6s_tooshort++;
258 icmp6len -= sizeof(*nd_ra);
259 nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
260 if (nd6_options(&ndopts) < 0) {
262 "nd6_ra_input: invalid ND option, ignored\n"));
263 /* nd6_options have incremented stats */
268 struct nd_defrouter dr0;
269 u_int32_t advreachable = nd_ra->nd_ra_reachable;
272 dr0.flags = nd_ra->nd_ra_flags_reserved;
273 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
274 dr0.expire = time_second + dr0.rtlifetime;
276 dr0.advint = 0; /* Mobile IPv6 */
277 dr0.advint_expire = 0; /* Mobile IPv6 */
278 dr0.advints_lost = 0; /* Mobile IPv6 */
279 /* unspecified or not? (RFC 2461 6.3.4) */
281 advreachable = ntohl(advreachable);
282 if (advreachable <= MAX_REACHABLE_TIME &&
283 ndi->basereachable != advreachable) {
284 ndi->basereachable = advreachable;
285 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
286 ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */
289 if (nd_ra->nd_ra_retransmit)
290 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
291 if (nd_ra->nd_ra_curhoplimit)
292 ndi->chlim = nd_ra->nd_ra_curhoplimit;
293 dr = defrtrlist_update(&dr0);
299 if (ndopts.nd_opts_pi) {
300 struct nd_opt_hdr *pt;
301 struct nd_opt_prefix_info *pi = NULL;
304 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
305 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
306 pt = (struct nd_opt_hdr *)((caddr_t)pt +
307 (pt->nd_opt_len << 3))) {
308 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
310 pi = (struct nd_opt_prefix_info *)pt;
312 if (pi->nd_opt_pi_len != 4) {
314 "nd6_ra_input: invalid option "
315 "len %d for prefix information option, "
316 "ignored\n", pi->nd_opt_pi_len));
320 if (128 < pi->nd_opt_pi_prefix_len) {
322 "nd6_ra_input: invalid prefix "
323 "len %d for prefix information option, "
324 "ignored\n", pi->nd_opt_pi_prefix_len));
328 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
329 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
331 "nd6_ra_input: invalid prefix "
333 ip6_sprintf(&pi->nd_opt_pi_prefix)));
337 /* aggregatable unicast address, rfc2374 */
338 if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20
339 && pi->nd_opt_pi_prefix_len != 64) {
341 "nd6_ra_input: invalid prefixlen "
342 "%d for rfc2374 prefix %s, ignored\n",
343 pi->nd_opt_pi_prefix_len,
344 ip6_sprintf(&pi->nd_opt_pi_prefix)));
348 bzero(&pr, sizeof(pr));
349 pr.ndpr_prefix.sin6_family = AF_INET6;
350 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
351 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
352 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
354 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
355 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
356 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
357 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
358 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
359 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
361 ntohl(pi->nd_opt_pi_preferred_time);
363 if (in6_init_prefix_ltimes(&pr))
364 continue; /* prefix lifetime init failed */
366 prelist_update(&pr, dr, m);
373 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
374 u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
377 if (mtu < IPV6_MMTU) {
378 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
379 "mtu=%d sent from %s, ignoring\n",
380 mtu, ip6_sprintf(&ip6->ip6_src)));
386 if (mtu <= ndi->maxmtu) {
387 int change = (ndi->linkmtu != mtu);
390 if (change) /* in6_maxmtu may change */
393 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
394 "mtu=%d sent from %s; "
395 "exceeds maxmtu %d, ignoring\n",
396 mtu, ip6_sprintf(&ip6->ip6_src),
400 nd6log((LOG_INFO, "nd6_ra_input: mtu option "
401 "mtu=%d sent from %s; maxmtu unknown, "
403 mtu, ip6_sprintf(&ip6->ip6_src)));
410 * Source link layer address
416 if (ndopts.nd_opts_src_lladdr) {
417 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
418 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
421 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
423 "nd6_ra_input: lladdrlen mismatch for %s "
424 "(if %d, RA packet %d)\n",
425 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
429 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0);
432 * Installing a link-layer address might change the state of the
433 * router's neighbor cache, which might also affect our on-link
434 * detection of adveritsed prefixes.
436 pfxlist_onlink_check();
444 icmp6stat.icp6s_badra++;
449 * default router list proccessing sub routines
452 /* tell the change to user processes watching the routing socket. */
458 struct rt_addrinfo info;
460 bzero((caddr_t)&info, sizeof(info));
461 info.rti_info[RTAX_DST] = rt_key(rt);
462 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
463 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
464 info.rti_info[RTAX_IFP] =
465 (struct sockaddr *)TAILQ_FIRST(&rt->rt_ifp->if_addrlist);
466 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
468 rt_missmsg(cmd, &info, rt->rt_flags, 0);
472 defrouter_addreq(new)
473 struct nd_defrouter *new;
475 struct sockaddr_in6 def, mask, gate;
476 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.
653 struct nd_defrouter *dr, anydr;
654 struct rtentry *rt = NULL;
655 struct llinfo_nd6 *ln = NULL;
660 * Search for a (probably) reachable router from the list.
662 for (dr = TAILQ_FIRST(&nd_defrouter); dr;
663 dr = TAILQ_NEXT(dr, dr_entry)) {
664 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
665 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
666 ND6_IS_LLINFO_PROBREACH(ln)) {
667 /* Got it, and move it to the head */
668 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
669 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry);
674 if ((dr = TAILQ_FIRST(&nd_defrouter))) {
676 * De-install the previous default gateway and install
678 * Note that if there is no reachable router in the list,
679 * the head entry will be used anyway.
680 * XXX: do we have to check the current routing table entry?
682 bzero(&anydr, sizeof(anydr));
683 defrouter_delreq(&anydr, 0);
684 defrouter_addreq(dr);
688 * The Default Router List is empty, so install the default
689 * route to an inteface.
690 * XXX: The specification does not say this mechanism should
691 * be restricted to hosts, but this would be not useful
692 * (even harmful) for routers.
694 if (!ip6_forwarding) {
696 * De-install the current default route
699 bzero(&anydr, sizeof(anydr));
700 defrouter_delreq(&anydr, 0);
703 * Install a route to the default interface
705 * XXX: we enable this for host only, because
706 * this may override a default route installed
707 * a user process (e.g. routing daemon) in a
710 defrouter_addifreq(nd6_defifp);
712 nd6log((LOG_INFO, "defrouter_select: "
713 "there's no default router and no default"
723 static struct nd_defrouter *
724 defrtrlist_update(new)
725 struct nd_defrouter *new;
727 struct nd_defrouter *dr, *n;
731 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
733 if (new->rtlifetime == 0) {
738 dr->flags = new->flags; /* xxx flag check */
739 dr->rtlifetime = new->rtlifetime;
740 dr->expire = new->expire;
746 /* entry does not exist */
747 if (new->rtlifetime == 0) {
752 n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
757 bzero(n, sizeof(*n));
761 * Insert the new router at the end of the Default Router List.
762 * If there is no other router, install it anyway. Otherwise,
763 * just continue to use the current default router.
765 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry);
766 if (TAILQ_FIRST(&nd_defrouter) == n)
772 static struct nd_pfxrouter *
773 pfxrtr_lookup(pr, dr)
774 struct nd_prefix *pr;
775 struct nd_defrouter *dr;
777 struct nd_pfxrouter *search;
779 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
780 if (search->router == dr)
789 struct nd_prefix *pr;
790 struct nd_defrouter *dr;
792 struct nd_pfxrouter *new;
794 new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
797 bzero(new, sizeof(*new));
800 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
802 pfxlist_onlink_check();
807 struct nd_pfxrouter *pfr;
809 LIST_REMOVE(pfr, pfr_entry);
814 nd6_prefix_lookup(pr)
815 struct nd_prefix *pr;
817 struct nd_prefix *search;
819 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) {
820 if (pr->ndpr_ifp == search->ndpr_ifp &&
821 pr->ndpr_plen == search->ndpr_plen &&
822 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
823 &search->ndpr_prefix.sin6_addr,
834 nd6_prelist_add(pr, dr, newp)
835 struct nd_prefix *pr, **newp;
836 struct nd_defrouter *dr;
838 struct nd_prefix *new = NULL;
841 new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
844 bzero(new, sizeof(*new));
850 LIST_INIT(&new->ndpr_advrtrs);
851 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
852 /* make prefix in the canonical form */
853 for (i = 0; i < 4; i++)
854 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
855 new->ndpr_mask.s6_addr32[i];
858 /* link ndpr_entry to nd_prefix list */
859 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry);
862 /* ND_OPT_PI_FLAG_ONLINK processing */
863 if (new->ndpr_raf_onlink) {
866 if ((e = nd6_prefix_onlink(new)) != 0) {
867 nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
868 "the prefix %s/%d on-link on %s (errno=%d)\n",
869 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
870 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
871 /* proceed anyway. XXX: is it correct? */
884 struct nd_prefix *pr;
886 struct nd_pfxrouter *pfr, *next;
889 /* make sure to invalidate the prefix until it is really freed. */
894 * Though these flags are now meaningless, we'd rather keep the value
895 * not to confuse users when executing "ndp -p".
897 pr->ndpr_raf_onlink = 0;
898 pr->ndpr_raf_auto = 0;
900 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
901 (e = nd6_prefix_offlink(pr)) != 0) {
902 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
904 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
905 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
906 /* what should we do? */
909 if (pr->ndpr_refcnt > 0)
910 return; /* notice here? */
914 /* unlink ndpr_entry from nd_prefix list */
915 LIST_REMOVE(pr, ndpr_entry);
917 /* free list of routers that adversed the prefix */
918 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
919 next = pfr->pfr_next;
927 pfxlist_onlink_check();
931 prelist_update(new, dr, m)
932 struct nd_prefix *new;
933 struct nd_defrouter *dr; /* may be NULL */
936 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
938 struct ifnet *ifp = new->ndpr_ifp;
939 struct nd_prefix *pr;
943 struct in6_addrlifetime lt6_tmp;
949 * Authenticity for NA consists authentication for
950 * both IP header and IP datagrams, doesn't it ?
952 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
953 auth = (m->m_flags & M_AUTHIPHDR
954 && m->m_flags & M_AUTHIPDGM) ? 1 : 0;
959 if ((pr = nd6_prefix_lookup(new)) != NULL) {
961 * nd6_prefix_lookup() ensures that pr and new have the same
962 * prefix on a same interface.
966 * Update prefix information. Note that the on-link (L) bit
967 * and the autonomous (A) bit should NOT be changed from 1
970 if (new->ndpr_raf_onlink == 1)
971 pr->ndpr_raf_onlink = 1;
972 if (new->ndpr_raf_auto == 1)
973 pr->ndpr_raf_auto = 1;
974 if (new->ndpr_raf_onlink) {
975 pr->ndpr_vltime = new->ndpr_vltime;
976 pr->ndpr_pltime = new->ndpr_pltime;
977 pr->ndpr_preferred = new->ndpr_preferred;
978 pr->ndpr_expire = new->ndpr_expire;
981 if (new->ndpr_raf_onlink &&
982 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
985 if ((e = nd6_prefix_onlink(pr)) != 0) {
987 "prelist_update: failed to make "
988 "the prefix %s/%d on-link on %s "
990 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
991 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
992 /* proceed anyway. XXX: is it correct? */
996 if (dr && pfxrtr_lookup(pr, dr) == NULL)
999 struct nd_prefix *newpr = NULL;
1003 if (new->ndpr_vltime == 0)
1005 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
1008 bzero(&new->ndpr_addr, sizeof(struct in6_addr));
1010 error = nd6_prelist_add(new, dr, &newpr);
1011 if (error != 0 || newpr == NULL) {
1012 nd6log((LOG_NOTICE, "prelist_update: "
1013 "nd6_prelist_add failed for %s/%d on %s "
1014 "errno=%d, returnpr=%p\n",
1015 ip6_sprintf(&new->ndpr_prefix.sin6_addr),
1016 new->ndpr_plen, if_name(new->ndpr_ifp),
1018 goto end; /* we should just give up in this case. */
1022 * XXX: from the ND point of view, we can ignore a prefix
1023 * with the on-link bit being zero. However, we need a
1024 * prefix structure for references from autoconfigured
1025 * addresses. Thus, we explicitly make suret that the prefix
1026 * itself expires now.
1028 if (newpr->ndpr_raf_onlink == 0) {
1029 newpr->ndpr_vltime = 0;
1030 newpr->ndpr_pltime = 0;
1031 in6_init_prefix_ltimes(newpr);
1038 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1039 * Note that pr must be non NULL at this point.
1042 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1043 if (!new->ndpr_raf_auto)
1047 * 5.5.3 (b). the link-local prefix should have been ignored in
1052 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
1053 * This should have been done in nd6_ra_input.
1057 * 5.5.3 (d). If the prefix advertised does not match the prefix of an
1058 * address already in the list, and the Valid Lifetime is not 0,
1059 * form an address. Note that even a manually configured address
1060 * should reject autoconfiguration of a new address.
1062 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1064 struct in6_ifaddr *ifa6;
1066 u_int32_t storedlifetime;
1068 if (ifa->ifa_addr->sa_family != AF_INET6)
1071 ifa6 = (struct in6_ifaddr *)ifa;
1074 * Spec is not clear here, but I believe we should concentrate
1075 * on unicast (i.e. not anycast) addresses.
1076 * XXX: other ia6_flags? detached or duplicated?
1078 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
1081 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL);
1082 if (ifa_plen != new->ndpr_plen ||
1083 !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr,
1084 &new->ndpr_prefix.sin6_addr,
1088 if (ia6_match == NULL) /* remember the first one */
1091 if ((ifa6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1095 * An already autoconfigured address matched. Now that we
1096 * are sure there is at least one matched address, we can
1097 * proceed to 5.5.3. (e): update the lifetimes according to the
1098 * "two hours" rule and the privacy extension.
1100 #define TWOHOUR (120*60)
1101 lt6_tmp = ifa6->ia6_lifetime;
1103 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1104 storedlifetime = ND6_INFINITE_LIFETIME;
1105 else if (IFA6_IS_INVALID(ifa6))
1108 storedlifetime = lt6_tmp.ia6t_expire - time_second;
1110 /* when not updating, keep the current stored lifetime. */
1111 lt6_tmp.ia6t_vltime = storedlifetime;
1113 if (TWOHOUR < new->ndpr_vltime ||
1114 storedlifetime < new->ndpr_vltime) {
1115 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1116 } else if (storedlifetime <= TWOHOUR
1119 * This condition is logically redundant, so we just
1121 * See IPng 6712, 6717, and 6721.
1123 && new->ndpr_vltime <= storedlifetime
1127 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1131 * new->ndpr_vltime <= TWOHOUR &&
1132 * TWOHOUR < storedlifetime
1134 lt6_tmp.ia6t_vltime = TWOHOUR;
1137 /* The 2 hour rule is not imposed for preferred lifetime. */
1138 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1140 in6_init_address_ltimes(pr, <6_tmp);
1143 * When adjusting the lifetimes of an existing temporary
1144 * address, only lower the lifetimes.
1145 * RFC 3041 3.3. (1).
1146 * XXX: how should we modify ia6t_[pv]ltime?
1148 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
1149 if (lt6_tmp.ia6t_expire == 0 || /* no expire */
1150 lt6_tmp.ia6t_expire >
1151 ifa6->ia6_lifetime.ia6t_expire) {
1152 lt6_tmp.ia6t_expire =
1153 ifa6->ia6_lifetime.ia6t_expire;
1155 if (lt6_tmp.ia6t_preferred == 0 || /* no expire */
1156 lt6_tmp.ia6t_preferred >
1157 ifa6->ia6_lifetime.ia6t_preferred) {
1158 lt6_tmp.ia6t_preferred =
1159 ifa6->ia6_lifetime.ia6t_preferred;
1163 ifa6->ia6_lifetime = lt6_tmp;
1165 if (ia6_match == NULL && new->ndpr_vltime) {
1167 * No address matched and the valid lifetime is non-zero.
1168 * Create a new address.
1170 if ((ia6 = in6_ifadd(new, NULL)) != NULL) {
1172 * note that we should use pr (not new) for reference.
1178 /* XXXYYY Don't do this, according to Jinmei. */
1179 pr->ndpr_addr = new->ndpr_addr;
1184 * When a new public address is created as described
1185 * in RFC2462, also create a new temporary address.
1188 * When an interface connects to a new link, a new
1189 * randomized interface identifier should be generated
1190 * immediately together with a new set of temporary
1191 * addresses. Thus, we specifiy 1 as the 2nd arg of
1194 if (ip6_use_tempaddr) {
1196 if ((e = in6_tmpifadd(ia6, 1)) != 0) {
1197 nd6log((LOG_NOTICE, "prelist_update: "
1198 "failed to create a temporary "
1199 "address, errno=%d\n",
1205 * A newly added address might affect the status
1206 * of other addresses, so we check and update it.
1207 * XXX: what if address duplication happens?
1209 pfxlist_onlink_check();
1211 /* just set an error. do not bark here. */
1212 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1224 * A supplement function used in the on-link detection below;
1225 * detect if a given prefix has a (probably) reachable advertising router.
1226 * XXX: lengthy function name...
1228 static struct nd_pfxrouter *
1229 find_pfxlist_reachable_router(pr)
1230 struct nd_prefix *pr;
1232 struct nd_pfxrouter *pfxrtr;
1234 struct llinfo_nd6 *ln;
1236 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr;
1237 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
1238 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0,
1239 pfxrtr->router->ifp)) &&
1240 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
1241 ND6_IS_LLINFO_PROBREACH(ln))
1250 * Check if each prefix in the prefix list has at least one available router
1251 * that advertised the prefix (a router is "available" if its neighbor cache
1252 * entry is reachable or probably reachable).
1253 * If the check fails, the prefix may be off-link, because, for example,
1254 * we have moved from the network but the lifetime of the prefix has not
1255 * expired yet. So we should not use the prefix if there is another prefix
1256 * that has an available router.
1257 * But, if there is no prefix that has an available router, we still regards
1258 * all the prefixes as on-link. This is because we can't tell if all the
1259 * routers are simply dead or if we really moved from the network and there
1260 * is no router around us.
1263 pfxlist_onlink_check()
1265 struct nd_prefix *pr;
1266 struct in6_ifaddr *ifa;
1269 * Check if there is a prefix that has a reachable advertising
1272 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1273 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1279 * There is at least one prefix that has a reachable router.
1280 * Detach prefixes which have no reachable advertising
1281 * router, and attach other prefixes.
1283 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1284 /* XXX: a link-local prefix should never be detached */
1285 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1289 * we aren't interested in prefixes without the L bit
1292 if (pr->ndpr_raf_onlink == 0)
1295 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1296 find_pfxlist_reachable_router(pr) == NULL)
1297 pr->ndpr_stateflags |= NDPRF_DETACHED;
1298 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1299 find_pfxlist_reachable_router(pr) != 0)
1300 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1303 /* there is no prefix that has a reachable router */
1304 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1305 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1308 if (pr->ndpr_raf_onlink == 0)
1311 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1312 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1317 * Remove each interface route associated with a (just) detached
1318 * prefix, and reinstall the interface route for a (just) attached
1319 * prefix. Note that all attempt of reinstallation does not
1320 * necessarily success, when a same prefix is shared among multiple
1321 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1322 * so we don't have to care about them.
1324 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1327 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1330 if (pr->ndpr_raf_onlink == 0)
1333 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1334 (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1335 if ((e = nd6_prefix_offlink(pr)) != 0) {
1337 "pfxlist_onlink_check: failed to "
1338 "make %s/%d offlink, errno=%d\n",
1339 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1343 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1344 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 &&
1345 pr->ndpr_raf_onlink) {
1346 if ((e = nd6_prefix_onlink(pr)) != 0) {
1348 "pfxlist_onlink_check: failed to "
1349 "make %s/%d offlink, errno=%d\n",
1350 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1357 * Changes on the prefix status might affect address status as well.
1358 * Make sure that all addresses derived from an attached prefix are
1359 * attached, and that all addresses derived from a detached prefix are
1360 * detached. Note, however, that a manually configured address should
1361 * always be attached.
1362 * The precise detection logic is same as the one for prefixes.
1364 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1365 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1368 if (ifa->ia6_ndpr == NULL) {
1370 * This can happen when we first configure the address
1371 * (i.e. the address exists, but the prefix does not).
1372 * XXX: complicated relationships...
1377 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1381 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1382 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1385 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1388 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1389 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1391 ifa->ia6_flags |= IN6_IFF_DETACHED;
1395 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1396 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1399 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1405 nd6_prefix_onlink(pr)
1406 struct nd_prefix *pr;
1409 struct ifnet *ifp = pr->ndpr_ifp;
1410 struct sockaddr_in6 mask6;
1411 struct nd_prefix *opr;
1414 struct rtentry *rt = NULL;
1417 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1419 "nd6_prefix_onlink: %s/%d is already on-link\n",
1420 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen);
1425 * Add the interface route associated with the prefix. Before
1426 * installing the route, check if there's the same prefix on another
1427 * interface, and the prefix has already installed the interface route.
1428 * Although such a configuration is expected to be rare, we explicitly
1431 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1435 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
1438 if (opr->ndpr_plen == pr->ndpr_plen &&
1439 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1440 &opr->ndpr_prefix.sin6_addr,
1446 * We prefer link-local addresses as the associated interface address.
1448 /* search for a link-local addr */
1449 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
1453 /* XXX: freebsd does not have ifa_ifwithaf */
1454 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1456 if (ifa->ifa_addr->sa_family == AF_INET6)
1459 /* should we care about ia6_flags? */
1463 * This can still happen, when, for example, we receive an RA
1464 * containing a prefix with the L bit set and the A bit clear,
1465 * after removing all IPv6 addresses on the receiving
1466 * interface. This should, of course, be rare though.
1469 "nd6_prefix_onlink: failed to find any ifaddr"
1470 " to add route for a prefix(%s/%d) on %s\n",
1471 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1472 pr->ndpr_plen, if_name(ifp)));
1477 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1478 * ifa->ifa_rtrequest = nd6_rtrequest;
1480 bzero(&mask6, sizeof(mask6));
1481 mask6.sin6_len = sizeof(mask6);
1482 mask6.sin6_addr = pr->ndpr_mask;
1483 rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP;
1484 if (nd6_need_cache(ifp)) {
1485 /* explicitly set in case ifa_flags does not set the flag. */
1486 rtflags |= RTF_CLONING;
1489 * explicitly clear the cloning bit in case ifa_flags sets it.
1491 rtflags &= ~RTF_CLONING;
1493 error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix,
1494 ifa->ifa_addr, (struct sockaddr *)&mask6,
1497 if (rt != NULL) /* this should be non NULL, though */
1498 nd6_rtmsg(RTM_ADD, rt);
1499 pr->ndpr_stateflags |= NDPRF_ONLINK;
1502 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a"
1503 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
1505 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1506 pr->ndpr_plen, if_name(ifp),
1507 ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
1508 ip6_sprintf(&mask6.sin6_addr), rtflags, error));
1518 nd6_prefix_offlink(pr)
1519 struct nd_prefix *pr;
1522 struct ifnet *ifp = pr->ndpr_ifp;
1523 struct nd_prefix *opr;
1524 struct sockaddr_in6 sa6, mask6;
1525 struct rtentry *rt = NULL;
1528 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1530 "nd6_prefix_offlink: %s/%d is already off-link\n",
1531 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen));
1535 bzero(&sa6, sizeof(sa6));
1536 sa6.sin6_family = AF_INET6;
1537 sa6.sin6_len = sizeof(sa6);
1538 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
1539 sizeof(struct in6_addr));
1540 bzero(&mask6, sizeof(mask6));
1541 mask6.sin6_family = AF_INET6;
1542 mask6.sin6_len = sizeof(sa6);
1543 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
1544 error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
1545 (struct sockaddr *)&mask6, 0, &rt);
1547 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
1549 /* report the route deletion to the routing socket. */
1551 nd6_rtmsg(RTM_DELETE, rt);
1554 * There might be the same prefix on another interface,
1555 * the prefix which could not be on-link just because we have
1556 * the interface route (see comments in nd6_prefix_onlink).
1557 * If there's one, try to make the prefix on-link on the
1560 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1564 if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
1568 * KAME specific: detached prefixes should not be
1571 if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1574 if (opr->ndpr_plen == pr->ndpr_plen &&
1575 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1576 &opr->ndpr_prefix.sin6_addr,
1580 if ((e = nd6_prefix_onlink(opr)) != 0) {
1582 "nd6_prefix_offlink: failed to "
1583 "recover a prefix %s/%d from %s "
1584 "to %s (errno = %d)\n",
1585 ip6_sprintf(&opr->ndpr_prefix.sin6_addr),
1586 opr->ndpr_plen, if_name(ifp),
1587 if_name(opr->ndpr_ifp), e));
1593 /* XXX: can we still set the NDPRF_ONLINK flag? */
1595 "nd6_prefix_offlink: failed to delete route: "
1596 "%s/%d on %s (errno = %d)\n",
1597 ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp),
1602 if (rt->rt_refcnt <= 0) {
1603 /* XXX: we should free the entry ourselves. */
1612 static struct in6_ifaddr *
1614 struct nd_prefix *pr;
1615 struct in6_addr *ifid; /* Mobile IPv6 addition */
1617 struct ifnet *ifp = pr->ndpr_ifp;
1619 struct in6_aliasreq ifra;
1620 struct in6_ifaddr *ia, *ib;
1622 struct in6_addr mask;
1623 int prefixlen = pr->ndpr_plen;
1625 in6_len2mask(&mask, prefixlen);
1628 * find a link-local address (will be interface ID).
1629 * Is it really mandatory? Theoretically, a global or a site-local
1630 * address can be configured without a link-local address, if we
1631 * have a unique interface identifier...
1633 * it is not mandatory to have a link-local address, we can generate
1634 * interface identifier on the fly. we do this because:
1635 * (1) it should be the easiest way to find interface identifier.
1636 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1637 * for multiple addresses on a single interface, and possible shortcut
1638 * of DAD. we omitted DAD for this reason in the past.
1639 * (3) a user can prevent autoconfiguration of global address
1640 * by removing link-local address by hand (this is partly because we
1641 * don't have other way to control the use of IPv6 on a interface.
1642 * this has been our design choice - cf. NRL's "ifconfig auto").
1643 * (4) it is easier to manage when an interface has addresses
1644 * with the same interface identifier, than to have multiple addresses
1645 * with different interface identifiers.
1647 * Mobile IPv6 addition: allow for caller to specify a wished interface
1648 * ID. This is to not break connections when moving addresses between
1651 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */
1653 ib = (struct in6_ifaddr *)ifa;
1657 #if 0 /* don't care link local addr state, and always do DAD */
1658 /* if link-local address is not eligible, do not autoconfigure. */
1659 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) {
1660 printf("in6_ifadd: link-local address not ready\n");
1665 /* prefixlen + ifidlen must be equal to 128 */
1666 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
1667 if (prefixlen != plen0) {
1668 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
1669 "(prefix=%d ifid=%d)\n",
1670 if_name(ifp), prefixlen, 128 - plen0));
1676 bzero(&ifra, sizeof(ifra));
1678 * in6_update_ifa() does not use ifra_name, but we accurately set it
1681 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1682 ifra.ifra_addr.sin6_family = AF_INET6;
1683 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
1685 bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr,
1686 sizeof(ifra.ifra_addr.sin6_addr));
1687 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
1688 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
1689 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
1690 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
1693 if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid))
1694 ifid = &ib->ia_addr.sin6_addr;
1695 ifra.ifra_addr.sin6_addr.s6_addr32[0]
1696 |= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]);
1697 ifra.ifra_addr.sin6_addr.s6_addr32[1]
1698 |= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]);
1699 ifra.ifra_addr.sin6_addr.s6_addr32[2]
1700 |= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]);
1701 ifra.ifra_addr.sin6_addr.s6_addr32[3]
1702 |= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]);
1704 /* new prefix mask. */
1705 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1706 ifra.ifra_prefixmask.sin6_family = AF_INET6;
1707 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
1708 sizeof(ifra.ifra_prefixmask.sin6_addr));
1712 * XXX: in6_init_address_ltimes would override these values later.
1713 * We should reconsider this logic.
1715 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
1716 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
1718 /* XXX: scope zone ID? */
1720 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
1722 * temporarily set the nopfx flag to avoid conflict.
1723 * XXX: we should reconsider the entire mechanism about prefix
1726 ifra.ifra_flags |= IN6_IFF_NOPFX;
1729 * keep the new address, regardless of the result of in6_update_ifa.
1730 * XXX: this address is now meaningless.
1731 * We should reconsider its role.
1733 pr->ndpr_addr = ifra.ifra_addr.sin6_addr;
1735 /* allocate ifaddr structure, link into chain, etc. */
1736 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
1738 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
1739 ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp),
1741 return(NULL); /* ifaddr must not have been allocated. */
1744 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1746 return(ia); /* this must NOT be NULL. */
1750 in6_tmpifadd(ia0, forcegen)
1751 const struct in6_ifaddr *ia0; /* corresponding public address */
1753 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
1754 struct in6_ifaddr *newia;
1755 struct in6_aliasreq ifra;
1757 int trylimit = 3; /* XXX: adhoc value */
1758 u_int32_t randid[2];
1759 time_t vltime0, pltime0;
1761 bzero(&ifra, sizeof(ifra));
1762 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1763 ifra.ifra_addr = ia0->ia_addr;
1764 /* copy prefix mask */
1765 ifra.ifra_prefixmask = ia0->ia_prefixmask;
1766 /* clear the old IFID */
1767 for (i = 0; i < 4; i++) {
1768 ifra.ifra_addr.sin6_addr.s6_addr32[i]
1769 &= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
1773 in6_get_tmpifid(ifp, (u_int8_t *)randid,
1774 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8],
1776 ifra.ifra_addr.sin6_addr.s6_addr32[2]
1777 |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
1778 ifra.ifra_addr.sin6_addr.s6_addr32[3]
1779 |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
1782 * If by chance the new temporary address is the same as an address
1783 * already assigned to the interface, generate a new randomized
1784 * interface identifier and repeat this step.
1787 if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) {
1788 if (trylimit-- == 0) {
1789 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find "
1790 "a unique random IFID\n"));
1798 * The Valid Lifetime is the lower of the Valid Lifetime of the
1799 * public address or TEMP_VALID_LIFETIME.
1800 * The Preferred Lifetime is the lower of the Preferred Lifetime
1801 * of the public address or TEMP_PREFERRED_LIFETIME -
1804 if (ia0->ia6_lifetime.ia6t_expire != 0) {
1805 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
1806 (ia0->ia6_lifetime.ia6t_expire - time_second);
1807 if (vltime0 > ip6_temp_valid_lifetime)
1808 vltime0 = ip6_temp_valid_lifetime;
1810 vltime0 = ip6_temp_valid_lifetime;
1811 if (ia0->ia6_lifetime.ia6t_preferred != 0) {
1812 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
1813 (ia0->ia6_lifetime.ia6t_preferred - time_second);
1814 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor) {
1815 pltime0 = ip6_temp_preferred_lifetime -
1819 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor;
1820 ifra.ifra_lifetime.ia6t_vltime = vltime0;
1821 ifra.ifra_lifetime.ia6t_pltime = pltime0;
1824 * A temporary address is created only if this calculated Preferred
1825 * Lifetime is greater than REGEN_ADVANCE time units.
1827 if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance)
1830 /* XXX: scope zone ID? */
1832 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
1834 /* allocate ifaddr structure, link into chain, etc. */
1835 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0)
1838 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1839 if (newia == NULL) { /* XXX: can it happen? */
1841 "in6_tmpifadd: ifa update succeeded, but we got "
1843 return(EINVAL); /* XXX */
1845 newia->ia6_ndpr = ia0->ia6_ndpr;
1846 newia->ia6_ndpr->ndpr_refcnt++;
1852 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
1854 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */
1855 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) {
1856 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime"
1857 "(%d) is greater than valid lifetime(%d)\n",
1858 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime));
1861 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
1862 ndpr->ndpr_preferred = 0;
1864 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime;
1865 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
1866 ndpr->ndpr_expire = 0;
1868 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime;
1874 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
1876 /* init ia6t_expire */
1877 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
1878 lt6->ia6t_expire = 0;
1880 lt6->ia6t_expire = time_second;
1881 lt6->ia6t_expire += lt6->ia6t_vltime;
1884 /* init ia6t_preferred */
1885 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
1886 lt6->ia6t_preferred = 0;
1888 lt6->ia6t_preferred = time_second;
1889 lt6->ia6t_preferred += lt6->ia6t_pltime;
1894 * Delete all the routing table entries that use the specified gateway.
1895 * XXX: this function causes search through all entries of routing table, so
1896 * it shouldn't be called when acting as a router.
1899 rt6_flush(gateway, ifp)
1900 struct in6_addr *gateway;
1903 struct radix_node_head *rnh = rt_tables[AF_INET6];
1907 /* We'll care only link-local addresses */
1908 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) {
1912 /* XXX: hack for KAME's link-local address kludge */
1913 gateway->s6_addr16[1] = htons(ifp->if_index);
1915 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
1920 rt6_deleteroute(rn, arg)
1921 struct radix_node *rn;
1924 #define SIN6(s) ((struct sockaddr_in6 *)s)
1925 struct rtentry *rt = (struct rtentry *)rn;
1926 struct in6_addr *gate = (struct in6_addr *)arg;
1928 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
1931 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr))
1935 * Do not delete a static route.
1936 * XXX: this seems to be a bit ad-hoc. Should we consider the
1937 * 'cloned' bit instead?
1939 if ((rt->rt_flags & RTF_STATIC) != 0)
1943 * We delete only host route. This means, in particular, we don't
1944 * delete default route.
1946 if ((rt->rt_flags & RTF_HOST) == 0)
1949 return(rtrequest(RTM_DELETE, rt_key(rt),
1950 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0));
1955 nd6_setdefaultiface(ifindex)
1960 if (ifindex < 0 || if_index < ifindex)
1963 if (nd6_defifindex != ifindex) {
1964 nd6_defifindex = ifindex;
1965 if (nd6_defifindex > 0)
1966 nd6_defifp = ifindex2ifnet[nd6_defifindex];
1971 * If the Default Router List is empty, install a route
1972 * to the specified interface as default or remove the default
1973 * route when the default interface becomes canceled.
1974 * The check for the queue is actually redundant, but
1975 * we do this here to avoid re-install the default route
1976 * if the list is NOT empty.
1978 if (TAILQ_FIRST(&nd_defrouter) == NULL)
1982 * Our current implementation assumes one-to-one maping between
1983 * interfaces and links, so it would be natural to use the
1984 * default interface as the default link.
1986 scope6_setdefault(nd6_defifp);