93VNET_DEFINE(int, nd6_defifindex);
94#define V_nd6_defifp VNET(nd6_defifp)
95
96VNET_DEFINE(int, ip6_use_tempaddr) = 0;
97
98VNET_DEFINE(int, ip6_desync_factor);
99VNET_DEFINE(u_int32_t, ip6_temp_preferred_lifetime) = DEF_TEMP_PREFERRED_LIFETIME;
100VNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime) = DEF_TEMP_VALID_LIFETIME;
101
102VNET_DEFINE(int, ip6_temp_regen_advance) = TEMPADDR_REGEN_ADVANCE;
103
104/* RTPREF_MEDIUM has to be 0! */
105#define RTPREF_HIGH 1
106#define RTPREF_MEDIUM 0
107#define RTPREF_LOW (-1)
108#define RTPREF_RESERVED (-2)
109#define RTPREF_INVALID (-3) /* internal */
110
111/*
112 * Receive Router Solicitation Message - just for routers.
113 * Router solicitation/advertisement is mostly managed by userland program
114 * (rtadvd) so here we have no function like nd6_ra_output().
115 *
116 * Based on RFC 2461
117 */
118void
119nd6_rs_input(struct mbuf *m, int off, int icmp6len)
120{
121 struct ifnet *ifp = m->m_pkthdr.rcvif;
122 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
123 struct nd_router_solicit *nd_rs;
124 struct in6_addr saddr6 = ip6->ip6_src;
125 char *lladdr = NULL;
126 int lladdrlen = 0;
127 union nd_opts ndopts;
128 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
129
130 /* If I'm not a router, ignore it. */
131 if (!V_ip6_forwarding)
132 goto freeit;
133
134 /* Sanity checks */
135 if (ip6->ip6_hlim != 255) {
136 nd6log((LOG_ERR,
137 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
138 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
139 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
140 goto bad;
141 }
142
143 /*
144 * Don't update the neighbor cache, if src = ::.
145 * This indicates that the src has no IP address assigned yet.
146 */
147 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
148 goto freeit;
149
150#ifndef PULLDOWN_TEST
151 IP6_EXTHDR_CHECK(m, off, icmp6len,);
152 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
153#else
154 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
155 if (nd_rs == NULL) {
156 ICMP6STAT_INC(icp6s_tooshort);
157 return;
158 }
159#endif
160
161 icmp6len -= sizeof(*nd_rs);
162 nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
163 if (nd6_options(&ndopts) < 0) {
164 nd6log((LOG_INFO,
165 "nd6_rs_input: invalid ND option, ignored\n"));
166 /* nd6_options have incremented stats */
167 goto freeit;
168 }
169
170 if (ndopts.nd_opts_src_lladdr) {
171 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
172 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
173 }
174
175 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
176 nd6log((LOG_INFO,
177 "nd6_rs_input: lladdrlen mismatch for %s "
178 "(if %d, RS packet %d)\n",
179 ip6_sprintf(ip6bufs, &saddr6),
180 ifp->if_addrlen, lladdrlen - 2));
181 goto bad;
182 }
183
184 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
185
186 freeit:
187 m_freem(m);
188 return;
189
190 bad:
191 ICMP6STAT_INC(icp6s_badrs);
192 m_freem(m);
193}
194
195/*
196 * Receive Router Advertisement Message.
197 *
198 * Based on RFC 2461
199 * TODO: on-link bit on prefix information
200 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
201 */
202void
203nd6_ra_input(struct mbuf *m, int off, int icmp6len)
204{
205 struct ifnet *ifp = m->m_pkthdr.rcvif;
206 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
207 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
208 struct nd_router_advert *nd_ra;
209 struct in6_addr saddr6 = ip6->ip6_src;
210 int mcast = 0;
211 union nd_opts ndopts;
212 struct nd_defrouter *dr;
213 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
214
215 /*
216 * We only accept RAs only when
217 * the node is not a router and
218 * per-interface variable allows RAs on the receiving interface.
219 */
220 if (V_ip6_forwarding || !(ndi->flags & ND6_IFF_ACCEPT_RTADV))
221 goto freeit;
222
223 if (ip6->ip6_hlim != 255) {
224 nd6log((LOG_ERR,
225 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
226 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
227 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
228 goto bad;
229 }
230
231 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
232 nd6log((LOG_ERR,
233 "nd6_ra_input: src %s is not link-local\n",
234 ip6_sprintf(ip6bufs, &saddr6)));
235 goto bad;
236 }
237
238#ifndef PULLDOWN_TEST
239 IP6_EXTHDR_CHECK(m, off, icmp6len,);
240 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
241#else
242 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
243 if (nd_ra == NULL) {
244 ICMP6STAT_INC(icp6s_tooshort);
245 return;
246 }
247#endif
248
249 icmp6len -= sizeof(*nd_ra);
250 nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
251 if (nd6_options(&ndopts) < 0) {
252 nd6log((LOG_INFO,
253 "nd6_ra_input: invalid ND option, ignored\n"));
254 /* nd6_options have incremented stats */
255 goto freeit;
256 }
257
258 {
259 struct nd_defrouter dr0;
260 u_int32_t advreachable = nd_ra->nd_ra_reachable;
261
262 /* remember if this is a multicasted advertisement */
263 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
264 mcast = 1;
265
266 bzero(&dr0, sizeof(dr0));
267 dr0.rtaddr = saddr6;
268 dr0.flags = nd_ra->nd_ra_flags_reserved;
269 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
270 dr0.expire = time_second + dr0.rtlifetime;
271 dr0.ifp = ifp;
272 /* unspecified or not? (RFC 2461 6.3.4) */
273 if (advreachable) {
274 advreachable = ntohl(advreachable);
275 if (advreachable <= MAX_REACHABLE_TIME &&
276 ndi->basereachable != advreachable) {
277 ndi->basereachable = advreachable;
278 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
279 ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */
280 }
281 }
282 if (nd_ra->nd_ra_retransmit)
283 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
284 if (nd_ra->nd_ra_curhoplimit)
285 ndi->chlim = nd_ra->nd_ra_curhoplimit;
286 dr = defrtrlist_update(&dr0);
287 }
288
289 /*
290 * prefix
291 */
292 if (ndopts.nd_opts_pi) {
293 struct nd_opt_hdr *pt;
294 struct nd_opt_prefix_info *pi = NULL;
295 struct nd_prefixctl pr;
296
297 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
298 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
299 pt = (struct nd_opt_hdr *)((caddr_t)pt +
300 (pt->nd_opt_len << 3))) {
301 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
302 continue;
303 pi = (struct nd_opt_prefix_info *)pt;
304
305 if (pi->nd_opt_pi_len != 4) {
306 nd6log((LOG_INFO,
307 "nd6_ra_input: invalid option "
308 "len %d for prefix information option, "
309 "ignored\n", pi->nd_opt_pi_len));
310 continue;
311 }
312
313 if (128 < pi->nd_opt_pi_prefix_len) {
314 nd6log((LOG_INFO,
315 "nd6_ra_input: invalid prefix "
316 "len %d for prefix information option, "
317 "ignored\n", pi->nd_opt_pi_prefix_len));
318 continue;
319 }
320
321 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
322 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
323 nd6log((LOG_INFO,
324 "nd6_ra_input: invalid prefix "
325 "%s, ignored\n",
326 ip6_sprintf(ip6bufs,
327 &pi->nd_opt_pi_prefix)));
328 continue;
329 }
330
331 bzero(&pr, sizeof(pr));
332 pr.ndpr_prefix.sin6_family = AF_INET6;
333 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
334 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
335 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
336
337 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
338 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
339 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
340 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
341 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
342 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
343 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
344 (void)prelist_update(&pr, dr, m, mcast);
345 }
346 }
347
348 /*
349 * MTU
350 */
351 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
352 u_long mtu;
353 u_long maxmtu;
354
355 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
356
357 /* lower bound */
358 if (mtu < IPV6_MMTU) {
359 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
360 "mtu=%lu sent from %s, ignoring\n",
361 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src)));
362 goto skip;
363 }
364
365 /* upper bound */
366 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
367 ? ndi->maxmtu : ifp->if_mtu;
368 if (mtu <= maxmtu) {
369 int change = (ndi->linkmtu != mtu);
370
371 ndi->linkmtu = mtu;
372 if (change) /* in6_maxmtu may change */
373 in6_setmaxmtu();
374 } else {
375 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
376 "mtu=%lu sent from %s; "
377 "exceeds maxmtu %lu, ignoring\n",
378 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu));
379 }
380 }
381
382 skip:
383
384 /*
385 * Source link layer address
386 */
387 {
388 char *lladdr = NULL;
389 int lladdrlen = 0;
390
391 if (ndopts.nd_opts_src_lladdr) {
392 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
393 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
394 }
395
396 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
397 nd6log((LOG_INFO,
398 "nd6_ra_input: lladdrlen mismatch for %s "
399 "(if %d, RA packet %d)\n", ip6_sprintf(ip6bufs, &saddr6),
400 ifp->if_addrlen, lladdrlen - 2));
401 goto bad;
402 }
403
404 nd6_cache_lladdr(ifp, &saddr6, lladdr,
405 lladdrlen, ND_ROUTER_ADVERT, 0);
406
407 /*
408 * Installing a link-layer address might change the state of the
409 * router's neighbor cache, which might also affect our on-link
410 * detection of adveritsed prefixes.
411 */
412 pfxlist_onlink_check();
413 }
414
415 freeit:
416 m_freem(m);
417 return;
418
419 bad:
420 ICMP6STAT_INC(icp6s_badra);
421 m_freem(m);
422}
423
424/*
425 * default router list proccessing sub routines
426 */
427
428/* tell the change to user processes watching the routing socket. */
429static void
430nd6_rtmsg(int cmd, struct rtentry *rt)
431{
432 struct rt_addrinfo info;
433 struct ifnet *ifp;
434 struct ifaddr *ifa;
435
436 bzero((caddr_t)&info, sizeof(info));
437 info.rti_info[RTAX_DST] = rt_key(rt);
438 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
439 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
440 ifp = rt->rt_ifp;
441 if (ifp != NULL) {
442 IF_ADDR_LOCK(ifp);
443 ifa = TAILQ_FIRST(&ifp->if_addrhead);
444 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
445 ifa_ref(ifa);
446 IF_ADDR_UNLOCK(ifp);
447 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
448 } else
449 ifa = NULL;
450
451 rt_missmsg(cmd, &info, rt->rt_flags, 0);
452 if (ifa != NULL)
453 ifa_free(ifa);
454}
455
456void
457defrouter_addreq(struct nd_defrouter *new)
458{
459 struct sockaddr_in6 def, mask, gate;
460 struct rtentry *newrt = NULL;
461 int s;
462 int error;
463
464 bzero(&def, sizeof(def));
465 bzero(&mask, sizeof(mask));
466 bzero(&gate, sizeof(gate));
467
468 def.sin6_len = mask.sin6_len = gate.sin6_len =
469 sizeof(struct sockaddr_in6);
470 def.sin6_family = gate.sin6_family = AF_INET6;
471 gate.sin6_addr = new->rtaddr;
472
473 s = splnet();
474 error = rtrequest(RTM_ADD, (struct sockaddr *)&def,
475 (struct sockaddr *)&gate, (struct sockaddr *)&mask,
476 RTF_GATEWAY, &newrt);
477 if (newrt) {
478 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
479 RTFREE(newrt);
480 }
481 if (error == 0)
482 new->installed = 1;
483 splx(s);
484 return;
485}
486
487struct nd_defrouter *
488defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
489{
490 struct nd_defrouter *dr;
491
492 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
493 dr = TAILQ_NEXT(dr, dr_entry)) {
494 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
495 return (dr);
496 }
497
498 return (NULL); /* search failed */
499}
500
501/*
502 * Remove the default route for a given router.
503 * This is just a subroutine function for defrouter_select(), and should
504 * not be called from anywhere else.
505 */
506static void
507defrouter_delreq(struct nd_defrouter *dr)
508{
509 struct sockaddr_in6 def, mask, gate;
510 struct rtentry *oldrt = NULL;
511
512 bzero(&def, sizeof(def));
513 bzero(&mask, sizeof(mask));
514 bzero(&gate, sizeof(gate));
515
516 def.sin6_len = mask.sin6_len = gate.sin6_len =
517 sizeof(struct sockaddr_in6);
518 def.sin6_family = gate.sin6_family = AF_INET6;
519 gate.sin6_addr = dr->rtaddr;
520
521 rtrequest(RTM_DELETE, (struct sockaddr *)&def,
522 (struct sockaddr *)&gate,
523 (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt);
524 if (oldrt) {
525 nd6_rtmsg(RTM_DELETE, oldrt);
526 RTFREE(oldrt);
527 }
528
529 dr->installed = 0;
530}
531
532/*
533 * remove all default routes from default router list
534 */
535void
536defrouter_reset(void)
537{
538 struct nd_defrouter *dr;
539
540 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
541 dr = TAILQ_NEXT(dr, dr_entry))
542 defrouter_delreq(dr);
543
544 /*
545 * XXX should we also nuke any default routers in the kernel, by
546 * going through them by rtalloc1()?
547 */
548}
549
550void
551defrtrlist_del(struct nd_defrouter *dr)
552{
553 struct nd_defrouter *deldr = NULL;
554 struct nd_prefix *pr;
555
556 /*
557 * Flush all the routing table entries that use the router
558 * as a next hop.
559 */
560 if (!V_ip6_forwarding)
561 rt6_flush(&dr->rtaddr, dr->ifp);
562
563 if (dr->installed) {
564 deldr = dr;
565 defrouter_delreq(dr);
566 }
567 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
568
569 /*
570 * Also delete all the pointers to the router in each prefix lists.
571 */
572 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
573 struct nd_pfxrouter *pfxrtr;
574 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
575 pfxrtr_del(pfxrtr);
576 }
577 pfxlist_onlink_check();
578
579 /*
580 * If the router is the primary one, choose a new one.
581 * Note that defrouter_select() will remove the current gateway
582 * from the routing table.
583 */
584 if (deldr)
585 defrouter_select();
586
587 free(dr, M_IP6NDP);
588}
589
590/*
591 * Default Router Selection according to Section 6.3.6 of RFC 2461 and
592 * draft-ietf-ipngwg-router-selection:
593 * 1) Routers that are reachable or probably reachable should be preferred.
594 * If we have more than one (probably) reachable router, prefer ones
595 * with the highest router preference.
596 * 2) When no routers on the list are known to be reachable or
597 * probably reachable, routers SHOULD be selected in a round-robin
598 * fashion, regardless of router preference values.
599 * 3) If the Default Router List is empty, assume that all
600 * destinations are on-link.
601 *
602 * We assume nd_defrouter is sorted by router preference value.
603 * Since the code below covers both with and without router preference cases,
604 * we do not need to classify the cases by ifdef.
605 *
606 * At this moment, we do not try to install more than one default router,
607 * even when the multipath routing is available, because we're not sure about
608 * the benefits for stub hosts comparing to the risk of making the code
609 * complicated and the possibility of introducing bugs.
610 */
611void
612defrouter_select(void)
613{
614 int s = splnet();
615 struct nd_defrouter *dr, *selected_dr = NULL, *installed_dr = NULL;
616 struct llentry *ln = NULL;
617
618 /*
619 * This function should be called only when acting as an autoconfigured
620 * host. Although the remaining part of this function is not effective
621 * if the node is not an autoconfigured host, we explicitly exclude
622 * such cases here for safety.
623 */
624 if (V_ip6_forwarding) {
625 nd6log((LOG_WARNING,
626 "defrouter_select: called unexpectedly (forwarding=%d)\n",
627 V_ip6_forwarding));
628 splx(s);
629 return;
630 }
631
632 /*
633 * Let's handle easy case (3) first:
634 * If default router list is empty, there's nothing to be done.
635 */
636 if (!TAILQ_FIRST(&V_nd_defrouter)) {
637 splx(s);
638 return;
639 }
640
641 /*
642 * Search for a (probably) reachable router from the list.
643 * We just pick up the first reachable one (if any), assuming that
644 * the ordering rule of the list described in defrtrlist_update().
645 */
646 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
647 dr = TAILQ_NEXT(dr, dr_entry)) {
648 IF_AFDATA_LOCK(dr->ifp);
649 if (selected_dr == NULL &&
650 (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
651 ND6_IS_LLINFO_PROBREACH(ln)) {
652 selected_dr = dr;
653 }
654 IF_AFDATA_UNLOCK(dr->ifp);
655 if (ln != NULL) {
656 LLE_RUNLOCK(ln);
657 ln = NULL;
658 }
659
660 if (dr->installed && installed_dr == NULL)
661 installed_dr = dr;
662 else if (dr->installed && installed_dr) {
663 /* this should not happen. warn for diagnosis. */
664 log(LOG_ERR, "defrouter_select: more than one router"
665 " is installed\n");
666 }
667 }
668 /*
669 * If none of the default routers was found to be reachable,
670 * round-robin the list regardless of preference.
671 * Otherwise, if we have an installed router, check if the selected
672 * (reachable) router should really be preferred to the installed one.
673 * We only prefer the new router when the old one is not reachable
674 * or when the new one has a really higher preference value.
675 */
676 if (selected_dr == NULL) {
677 if (installed_dr == NULL || !TAILQ_NEXT(installed_dr, dr_entry))
678 selected_dr = TAILQ_FIRST(&V_nd_defrouter);
679 else
680 selected_dr = TAILQ_NEXT(installed_dr, dr_entry);
681 } else if (installed_dr) {
682 IF_AFDATA_LOCK(installed_dr->ifp);
683 if ((ln = nd6_lookup(&installed_dr->rtaddr, 0, installed_dr->ifp)) &&
684 ND6_IS_LLINFO_PROBREACH(ln) &&
685 rtpref(selected_dr) <= rtpref(installed_dr)) {
686 selected_dr = installed_dr;
687 }
688 IF_AFDATA_UNLOCK(installed_dr->ifp);
689 if (ln != NULL)
690 LLE_RUNLOCK(ln);
691 }
692
693 /*
694 * If the selected router is different than the installed one,
695 * remove the installed router and install the selected one.
696 * Note that the selected router is never NULL here.
697 */
698 if (installed_dr != selected_dr) {
699 if (installed_dr)
700 defrouter_delreq(installed_dr);
701 defrouter_addreq(selected_dr);
702 }
703
704 splx(s);
705 return;
706}
707
708/*
709 * for default router selection
710 * regards router-preference field as a 2-bit signed integer
711 */
712static int
713rtpref(struct nd_defrouter *dr)
714{
715 switch (dr->flags & ND_RA_FLAG_RTPREF_MASK) {
716 case ND_RA_FLAG_RTPREF_HIGH:
717 return (RTPREF_HIGH);
718 case ND_RA_FLAG_RTPREF_MEDIUM:
719 case ND_RA_FLAG_RTPREF_RSV:
720 return (RTPREF_MEDIUM);
721 case ND_RA_FLAG_RTPREF_LOW:
722 return (RTPREF_LOW);
723 default:
724 /*
725 * This case should never happen. If it did, it would mean a
726 * serious bug of kernel internal. We thus always bark here.
727 * Or, can we even panic?
728 */
729 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->flags);
730 return (RTPREF_INVALID);
731 }
732 /* NOTREACHED */
733}
734
735static struct nd_defrouter *
736defrtrlist_update(struct nd_defrouter *new)
737{
738 struct nd_defrouter *dr, *n;
739 int s = splnet();
740
741 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
742 /* entry exists */
743 if (new->rtlifetime == 0) {
744 defrtrlist_del(dr);
745 dr = NULL;
746 } else {
747 int oldpref = rtpref(dr);
748
749 /* override */
750 dr->flags = new->flags; /* xxx flag check */
751 dr->rtlifetime = new->rtlifetime;
752 dr->expire = new->expire;
753
754 /*
755 * If the preference does not change, there's no need
756 * to sort the entries.
757 */
758 if (rtpref(new) == oldpref) {
759 splx(s);
760 return (dr);
761 }
762
763 /*
764 * preferred router may be changed, so relocate
765 * this router.
766 * XXX: calling TAILQ_REMOVE directly is a bad manner.
767 * However, since defrtrlist_del() has many side
768 * effects, we intentionally do so here.
769 * defrouter_select() below will handle routing
770 * changes later.
771 */
772 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
773 n = dr;
774 goto insert;
775 }
776 splx(s);
777 return (dr);
778 }
779
780 /* entry does not exist */
781 if (new->rtlifetime == 0) {
782 splx(s);
783 return (NULL);
784 }
785
786 n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
787 if (n == NULL) {
788 splx(s);
789 return (NULL);
790 }
791 bzero(n, sizeof(*n));
792 *n = *new;
793
794insert:
795 /*
796 * Insert the new router in the Default Router List;
797 * The Default Router List should be in the descending order
798 * of router-preferece. Routers with the same preference are
799 * sorted in the arriving time order.
800 */
801
802 /* insert at the end of the group */
803 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
804 dr = TAILQ_NEXT(dr, dr_entry)) {
805 if (rtpref(n) > rtpref(dr))
806 break;
807 }
808 if (dr)
809 TAILQ_INSERT_BEFORE(dr, n, dr_entry);
810 else
811 TAILQ_INSERT_TAIL(&V_nd_defrouter, n, dr_entry);
812
813 defrouter_select();
814
815 splx(s);
816
817 return (n);
818}
819
820static struct nd_pfxrouter *
821pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
822{
823 struct nd_pfxrouter *search;
824
825 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
826 if (search->router == dr)
827 break;
828 }
829
830 return (search);
831}
832
833static void
834pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
835{
836 struct nd_pfxrouter *new;
837
838 new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
839 if (new == NULL)
840 return;
841 bzero(new, sizeof(*new));
842 new->router = dr;
843
844 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
845
846 pfxlist_onlink_check();
847}
848
849static void
850pfxrtr_del(struct nd_pfxrouter *pfr)
851{
852 LIST_REMOVE(pfr, pfr_entry);
853 free(pfr, M_IP6NDP);
854}
855
856struct nd_prefix *
857nd6_prefix_lookup(struct nd_prefixctl *key)
858{
859 struct nd_prefix *search;
860
861 for (search = V_nd_prefix.lh_first;
862 search; search = search->ndpr_next) {
863 if (key->ndpr_ifp == search->ndpr_ifp &&
864 key->ndpr_plen == search->ndpr_plen &&
865 in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr,
866 &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) {
867 break;
868 }
869 }
870
871 return (search);
872}
873
874int
875nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr,
876 struct nd_prefix **newp)
877{
878 struct nd_prefix *new = NULL;
879 int error = 0;
880 int i, s;
881 char ip6buf[INET6_ADDRSTRLEN];
882
883 new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
884 if (new == NULL)
885 return(ENOMEM);
886 bzero(new, sizeof(*new));
887 new->ndpr_ifp = pr->ndpr_ifp;
888 new->ndpr_prefix = pr->ndpr_prefix;
889 new->ndpr_plen = pr->ndpr_plen;
890 new->ndpr_vltime = pr->ndpr_vltime;
891 new->ndpr_pltime = pr->ndpr_pltime;
892 new->ndpr_flags = pr->ndpr_flags;
893 if ((error = in6_init_prefix_ltimes(new)) != 0) {
894 free(new, M_IP6NDP);
895 return(error);
896 }
897 new->ndpr_lastupdate = time_second;
898 if (newp != NULL)
899 *newp = new;
900
901 /* initialization */
902 LIST_INIT(&new->ndpr_advrtrs);
903 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
904 /* make prefix in the canonical form */
905 for (i = 0; i < 4; i++)
906 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
907 new->ndpr_mask.s6_addr32[i];
908
909 s = splnet();
910 /* link ndpr_entry to nd_prefix list */
911 LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry);
912 splx(s);
913
914 /* ND_OPT_PI_FLAG_ONLINK processing */
915 if (new->ndpr_raf_onlink) {
916 int e;
917
918 if ((e = nd6_prefix_onlink(new)) != 0) {
919 nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
920 "the prefix %s/%d on-link on %s (errno=%d)\n",
921 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
922 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
923 /* proceed anyway. XXX: is it correct? */
924 }
925 }
926
927 if (dr)
928 pfxrtr_add(new, dr);
929
930 return 0;
931}
932
933void
934prelist_remove(struct nd_prefix *pr)
935{
936 struct nd_pfxrouter *pfr, *next;
937 int e, s;
938 char ip6buf[INET6_ADDRSTRLEN];
939
940 /* make sure to invalidate the prefix until it is really freed. */
941 pr->ndpr_vltime = 0;
942 pr->ndpr_pltime = 0;
943
944 /*
945 * Though these flags are now meaningless, we'd rather keep the value
946 * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users
947 * when executing "ndp -p".
948 */
949
950 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
951 (e = nd6_prefix_offlink(pr)) != 0) {
952 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
953 "on %s, errno=%d\n",
954 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
955 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
956 /* what should we do? */
957 }
958
959 if (pr->ndpr_refcnt > 0)
960 return; /* notice here? */
961
962 s = splnet();
963
964 /* unlink ndpr_entry from nd_prefix list */
965 LIST_REMOVE(pr, ndpr_entry);
966
967 /* free list of routers that adversed the prefix */
968 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
969 next = pfr->pfr_next;
970
971 free(pfr, M_IP6NDP);
972 }
973 splx(s);
974
975 free(pr, M_IP6NDP);
976
977 pfxlist_onlink_check();
978}
979
980/*
981 * dr - may be NULL
982 */
983
984static int
985prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr,
986 struct mbuf *m, int mcast)
987{
988 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
989 struct ifaddr *ifa;
990 struct ifnet *ifp = new->ndpr_ifp;
991 struct nd_prefix *pr;
992 int s = splnet();
993 int error = 0;
994 int newprefix = 0;
995 int auth;
996 struct in6_addrlifetime lt6_tmp;
997 char ip6buf[INET6_ADDRSTRLEN];
998
999 auth = 0;
1000 if (m) {
1001 /*
1002 * Authenticity for NA consists authentication for
1003 * both IP header and IP datagrams, doesn't it ?
1004 */
1005#if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
1006 auth = ((m->m_flags & M_AUTHIPHDR) &&
1007 (m->m_flags & M_AUTHIPDGM));
1008#endif
1009 }
1010
1011 if ((pr = nd6_prefix_lookup(new)) != NULL) {
1012 /*
1013 * nd6_prefix_lookup() ensures that pr and new have the same
1014 * prefix on a same interface.
1015 */
1016
1017 /*
1018 * Update prefix information. Note that the on-link (L) bit
1019 * and the autonomous (A) bit should NOT be changed from 1
1020 * to 0.
1021 */
1022 if (new->ndpr_raf_onlink == 1)
1023 pr->ndpr_raf_onlink = 1;
1024 if (new->ndpr_raf_auto == 1)
1025 pr->ndpr_raf_auto = 1;
1026 if (new->ndpr_raf_onlink) {
1027 pr->ndpr_vltime = new->ndpr_vltime;
1028 pr->ndpr_pltime = new->ndpr_pltime;
1029 (void)in6_init_prefix_ltimes(pr); /* XXX error case? */
1030 pr->ndpr_lastupdate = time_second;
1031 }
1032
1033 if (new->ndpr_raf_onlink &&
1034 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1035 int e;
1036
1037 if ((e = nd6_prefix_onlink(pr)) != 0) {
1038 nd6log((LOG_ERR,
1039 "prelist_update: failed to make "
1040 "the prefix %s/%d on-link on %s "
1041 "(errno=%d)\n",
1042 ip6_sprintf(ip6buf,
1043 &pr->ndpr_prefix.sin6_addr),
1044 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
1045 /* proceed anyway. XXX: is it correct? */
1046 }
1047 }
1048
1049 if (dr && pfxrtr_lookup(pr, dr) == NULL)
1050 pfxrtr_add(pr, dr);
1051 } else {
1052 struct nd_prefix *newpr = NULL;
1053
1054 newprefix = 1;
1055
1056 if (new->ndpr_vltime == 0)
1057 goto end;
1058 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
1059 goto end;
1060
1061 error = nd6_prelist_add(new, dr, &newpr);
1062 if (error != 0 || newpr == NULL) {
1063 nd6log((LOG_NOTICE, "prelist_update: "
1064 "nd6_prelist_add failed for %s/%d on %s "
1065 "errno=%d, returnpr=%p\n",
1066 ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr),
1067 new->ndpr_plen, if_name(new->ndpr_ifp),
1068 error, newpr));
1069 goto end; /* we should just give up in this case. */
1070 }
1071
1072 /*
1073 * XXX: from the ND point of view, we can ignore a prefix
1074 * with the on-link bit being zero. However, we need a
1075 * prefix structure for references from autoconfigured
1076 * addresses. Thus, we explicitly make sure that the prefix
1077 * itself expires now.
1078 */
1079 if (newpr->ndpr_raf_onlink == 0) {
1080 newpr->ndpr_vltime = 0;
1081 newpr->ndpr_pltime = 0;
1082 in6_init_prefix_ltimes(newpr);
1083 }
1084
1085 pr = newpr;
1086 }
1087
1088 /*
1089 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1090 * Note that pr must be non NULL at this point.
1091 */
1092
1093 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1094 if (!new->ndpr_raf_auto)
1095 goto end;
1096
1097 /*
1098 * 5.5.3 (b). the link-local prefix should have been ignored in
1099 * nd6_ra_input.
1100 */
1101
1102 /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */
1103 if (new->ndpr_pltime > new->ndpr_vltime) {
1104 error = EINVAL; /* XXX: won't be used */
1105 goto end;
1106 }
1107
1108 /*
1109 * 5.5.3 (d). If the prefix advertised is not equal to the prefix of
1110 * an address configured by stateless autoconfiguration already in the
1111 * list of addresses associated with the interface, and the Valid
1112 * Lifetime is not 0, form an address. We first check if we have
1113 * a matching prefix.
1114 * Note: we apply a clarification in rfc2462bis-02 here. We only
1115 * consider autoconfigured addresses while RFC2462 simply said
1116 * "address".
1117 */
1118 IF_ADDR_LOCK(ifp);
1119 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1120 struct in6_ifaddr *ifa6;
1121 u_int32_t remaininglifetime;
1122
1123 if (ifa->ifa_addr->sa_family != AF_INET6)
1124 continue;
1125
1126 ifa6 = (struct in6_ifaddr *)ifa;
1127
1128 /*
1129 * We only consider autoconfigured addresses as per rfc2462bis.
1130 */
1131 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
1132 continue;
1133
1134 /*
1135 * Spec is not clear here, but I believe we should concentrate
1136 * on unicast (i.e. not anycast) addresses.
1137 * XXX: other ia6_flags? detached or duplicated?
1138 */
1139 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
1140 continue;
1141
1142 /*
1143 * Ignore the address if it is not associated with a prefix
1144 * or is associated with a prefix that is different from this
1145 * one. (pr is never NULL here)
1146 */
1147 if (ifa6->ia6_ndpr != pr)
1148 continue;
1149
1150 if (ia6_match == NULL) /* remember the first one */
1151 ia6_match = ifa6;
1152
1153 /*
1154 * An already autoconfigured address matched. Now that we
1155 * are sure there is at least one matched address, we can
1156 * proceed to 5.5.3. (e): update the lifetimes according to the
1157 * "two hours" rule and the privacy extension.
1158 * We apply some clarifications in rfc2462bis:
1159 * - use remaininglifetime instead of storedlifetime as a
1160 * variable name
1161 * - remove the dead code in the "two-hour" rule
1162 */
1163#define TWOHOUR (120*60)
1164 lt6_tmp = ifa6->ia6_lifetime;
1165
1166 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1167 remaininglifetime = ND6_INFINITE_LIFETIME;
1168 else if (time_second - ifa6->ia6_updatetime >
1169 lt6_tmp.ia6t_vltime) {
1170 /*
1171 * The case of "invalid" address. We should usually
1172 * not see this case.
1173 */
1174 remaininglifetime = 0;
1175 } else
1176 remaininglifetime = lt6_tmp.ia6t_vltime -
1177 (time_second - ifa6->ia6_updatetime);
1178
1179 /* when not updating, keep the current stored lifetime. */
1180 lt6_tmp.ia6t_vltime = remaininglifetime;
1181
1182 if (TWOHOUR < new->ndpr_vltime ||
1183 remaininglifetime < new->ndpr_vltime) {
1184 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1185 } else if (remaininglifetime <= TWOHOUR) {
1186 if (auth) {
1187 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1188 }
1189 } else {
1190 /*
1191 * new->ndpr_vltime <= TWOHOUR &&
1192 * TWOHOUR < remaininglifetime
1193 */
1194 lt6_tmp.ia6t_vltime = TWOHOUR;
1195 }
1196
1197 /* The 2 hour rule is not imposed for preferred lifetime. */
1198 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1199
1200 in6_init_address_ltimes(pr, <6_tmp);
1201
1202 /*
1203 * We need to treat lifetimes for temporary addresses
1204 * differently, according to
1205 * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1);
1206 * we only update the lifetimes when they are in the maximum
1207 * intervals.
1208 */
1209 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
1210 u_int32_t maxvltime, maxpltime;
1211
1212 if (V_ip6_temp_valid_lifetime >
1213 (u_int32_t)((time_second - ifa6->ia6_createtime) +
1214 V_ip6_desync_factor)) {
1215 maxvltime = V_ip6_temp_valid_lifetime -
1216 (time_second - ifa6->ia6_createtime) -
1217 V_ip6_desync_factor;
1218 } else
1219 maxvltime = 0;
1220 if (V_ip6_temp_preferred_lifetime >
1221 (u_int32_t)((time_second - ifa6->ia6_createtime) +
1222 V_ip6_desync_factor)) {
1223 maxpltime = V_ip6_temp_preferred_lifetime -
1224 (time_second - ifa6->ia6_createtime) -
1225 V_ip6_desync_factor;
1226 } else
1227 maxpltime = 0;
1228
1229 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME ||
1230 lt6_tmp.ia6t_vltime > maxvltime) {
1231 lt6_tmp.ia6t_vltime = maxvltime;
1232 }
1233 if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME ||
1234 lt6_tmp.ia6t_pltime > maxpltime) {
1235 lt6_tmp.ia6t_pltime = maxpltime;
1236 }
1237 }
1238 ifa6->ia6_lifetime = lt6_tmp;
1239 ifa6->ia6_updatetime = time_second;
1240 }
1241 IF_ADDR_UNLOCK(ifp);
1242 if (ia6_match == NULL && new->ndpr_vltime) {
1243 int ifidlen;
1244
1245 /*
1246 * 5.5.3 (d) (continued)
1247 * No address matched and the valid lifetime is non-zero.
1248 * Create a new address.
1249 */
1250
1251 /*
1252 * Prefix Length check:
1253 * If the sum of the prefix length and interface identifier
1254 * length does not equal 128 bits, the Prefix Information
1255 * option MUST be ignored. The length of the interface
1256 * identifier is defined in a separate link-type specific
1257 * document.
1258 */
1259 ifidlen = in6_if2idlen(ifp);
1260 if (ifidlen < 0) {
1261 /* this should not happen, so we always log it. */
1262 log(LOG_ERR, "prelist_update: IFID undefined (%s)\n",
1263 if_name(ifp));
1264 goto end;
1265 }
1266 if (ifidlen + pr->ndpr_plen != 128) {
1267 nd6log((LOG_INFO,
1268 "prelist_update: invalid prefixlen "
1269 "%d for %s, ignored\n",
1270 pr->ndpr_plen, if_name(ifp)));
1271 goto end;
1272 }
1273
1274 if ((ia6 = in6_ifadd(new, mcast)) != NULL) {
1275 /*
1276 * note that we should use pr (not new) for reference.
1277 */
1278 pr->ndpr_refcnt++;
1279 ia6->ia6_ndpr = pr;
1280
1281 /*
1282 * RFC 3041 3.3 (2).
1283 * When a new public address is created as described
1284 * in RFC2462, also create a new temporary address.
1285 *
1286 * RFC 3041 3.5.
1287 * When an interface connects to a new link, a new
1288 * randomized interface identifier should be generated
1289 * immediately together with a new set of temporary
1290 * addresses. Thus, we specifiy 1 as the 2nd arg of
1291 * in6_tmpifadd().
1292 */
1293 if (V_ip6_use_tempaddr) {
1294 int e;
1295 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) {
1296 nd6log((LOG_NOTICE, "prelist_update: "
1297 "failed to create a temporary "
1298 "address, errno=%d\n",
1299 e));
1300 }
1301 }
1302 ifa_free(&ia6->ia_ifa);
1303
1304 /*
1305 * A newly added address might affect the status
1306 * of other addresses, so we check and update it.
1307 * XXX: what if address duplication happens?
1308 */
1309 pfxlist_onlink_check();
1310 } else {
1311 /* just set an error. do not bark here. */
1312 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1313 }
1314 }
1315
1316 end:
1317 splx(s);
1318 return error;
1319}
1320
1321/*
1322 * A supplement function used in the on-link detection below;
1323 * detect if a given prefix has a (probably) reachable advertising router.
1324 * XXX: lengthy function name...
1325 */
1326static struct nd_pfxrouter *
1327find_pfxlist_reachable_router(struct nd_prefix *pr)
1328{
1329 struct nd_pfxrouter *pfxrtr;
1330 struct llentry *ln;
1331 int canreach;
1332
1333 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr != NULL;
1334 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
1335 IF_AFDATA_LOCK(pfxrtr->router->ifp);
1336 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp);
1337 IF_AFDATA_UNLOCK(pfxrtr->router->ifp);
1338 if (ln == NULL)
1339 continue;
1340 canreach = ND6_IS_LLINFO_PROBREACH(ln);
1341 LLE_RUNLOCK(ln);
1342 if (canreach)
1343 break;
1344 }
1345 return (pfxrtr);
1346}
1347
1348/*
1349 * Check if each prefix in the prefix list has at least one available router
1350 * that advertised the prefix (a router is "available" if its neighbor cache
1351 * entry is reachable or probably reachable).
1352 * If the check fails, the prefix may be off-link, because, for example,
1353 * we have moved from the network but the lifetime of the prefix has not
1354 * expired yet. So we should not use the prefix if there is another prefix
1355 * that has an available router.
1356 * But, if there is no prefix that has an available router, we still regards
1357 * all the prefixes as on-link. This is because we can't tell if all the
1358 * routers are simply dead or if we really moved from the network and there
1359 * is no router around us.
1360 */
1361void
1362pfxlist_onlink_check()
1363{
1364 struct nd_prefix *pr;
1365 struct in6_ifaddr *ifa;
1366 struct nd_defrouter *dr;
1367 struct nd_pfxrouter *pfxrtr = NULL;
1368
1369 /*
1370 * Check if there is a prefix that has a reachable advertising
1371 * router.
1372 */
1373 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1374 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1375 break;
1376 }
1377
1378 /*
1379 * If we have no such prefix, check whether we still have a router
1380 * that does not advertise any prefixes.
1381 */
1382 if (pr == NULL) {
1383 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
1384 dr = TAILQ_NEXT(dr, dr_entry)) {
1385 struct nd_prefix *pr0;
1386
1387 for (pr0 = V_nd_prefix.lh_first; pr0;
1388 pr0 = pr0->ndpr_next) {
1389 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
1390 break;
1391 }
1392 if (pfxrtr != NULL)
1393 break;
1394 }
1395 }
1396 if (pr != NULL || (TAILQ_FIRST(&V_nd_defrouter) && pfxrtr == NULL)) {
1397 /*
1398 * There is at least one prefix that has a reachable router,
1399 * or at least a router which probably does not advertise
1400 * any prefixes. The latter would be the case when we move
1401 * to a new link where we have a router that does not provide
1402 * prefixes and we configure an address by hand.
1403 * Detach prefixes which have no reachable advertising
1404 * router, and attach other prefixes.
1405 */
1406 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1407 /* XXX: a link-local prefix should never be detached */
1408 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1409 continue;
1410
1411 /*
1412 * we aren't interested in prefixes without the L bit
1413 * set.
1414 */
1415 if (pr->ndpr_raf_onlink == 0)
1416 continue;
1417
1418 if (pr->ndpr_raf_auto == 0)
1419 continue;
1420
1421 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1422 find_pfxlist_reachable_router(pr) == NULL)
1423 pr->ndpr_stateflags |= NDPRF_DETACHED;
1424 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1425 find_pfxlist_reachable_router(pr) != 0)
1426 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1427 }
1428 } else {
1429 /* there is no prefix that has a reachable router */
1430 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1431 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1432 continue;
1433
1434 if (pr->ndpr_raf_onlink == 0)
1435 continue;
1436
1437 if (pr->ndpr_raf_auto == 0)
1438 continue;
1439
1440 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1441 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1442 }
1443 }
1444
1445 /*
1446 * Remove each interface route associated with a (just) detached
1447 * prefix, and reinstall the interface route for a (just) attached
1448 * prefix. Note that all attempt of reinstallation does not
1449 * necessarily success, when a same prefix is shared among multiple
1450 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1451 * so we don't have to care about them.
1452 */
1453 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1454 int e;
1455 char ip6buf[INET6_ADDRSTRLEN];
1456
1457 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1458 continue;
1459
1460 if (pr->ndpr_raf_onlink == 0)
1461 continue;
1462
1463 if (pr->ndpr_raf_auto == 0)
1464 continue;
1465
1466 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1467 (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1468 if ((e = nd6_prefix_offlink(pr)) != 0) {
1469 nd6log((LOG_ERR,
1470 "pfxlist_onlink_check: failed to "
1471 "make %s/%d offlink, errno=%d\n",
1472 ip6_sprintf(ip6buf,
1473 &pr->ndpr_prefix.sin6_addr),
1474 pr->ndpr_plen, e));
1475 }
1476 }
1477 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1478 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 &&
1479 pr->ndpr_raf_onlink) {
1480 if ((e = nd6_prefix_onlink(pr)) != 0) {
1481 nd6log((LOG_ERR,
1482 "pfxlist_onlink_check: failed to "
1483 "make %s/%d onlink, errno=%d\n",
1484 ip6_sprintf(ip6buf,
1485 &pr->ndpr_prefix.sin6_addr),
1486 pr->ndpr_plen, e));
1487 }
1488 }
1489 }
1490
1491 /*
1492 * Changes on the prefix status might affect address status as well.
1493 * Make sure that all addresses derived from an attached prefix are
1494 * attached, and that all addresses derived from a detached prefix are
1495 * detached. Note, however, that a manually configured address should
1496 * always be attached.
1497 * The precise detection logic is same as the one for prefixes.
1498 *
1499 * XXXRW: in6_ifaddrhead locking.
1500 */
1501 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1502 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1503 continue;
1504
1505 if (ifa->ia6_ndpr == NULL) {
1506 /*
1507 * This can happen when we first configure the address
1508 * (i.e. the address exists, but the prefix does not).
1509 * XXX: complicated relationships...
1510 */
1511 continue;
1512 }
1513
1514 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1515 break;
1516 }
1517 if (ifa) {
1518 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1519 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1520 continue;
1521
1522 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1523 continue;
1524
1525 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) {
1526 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1527 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1528 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1529 nd6_dad_start((struct ifaddr *)ifa, 0);
1530 }
1531 } else {
1532 ifa->ia6_flags |= IN6_IFF_DETACHED;
1533 }
1534 }
1535 }
1536 else {
1537 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1538 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1539 continue;
1540
1541 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1542 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1543 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1544 /* Do we need a delay in this case? */
1545 nd6_dad_start((struct ifaddr *)ifa, 0);
1546 }
1547 }
1548 }
1549}
1550
1551int
1552nd6_prefix_onlink(struct nd_prefix *pr)
1553{
1554 struct ifaddr *ifa;
1555 struct ifnet *ifp = pr->ndpr_ifp;
1556 struct sockaddr_in6 mask6;
1557 struct nd_prefix *opr;
1558 u_long rtflags;
1559 int error = 0;
1560 struct radix_node_head *rnh;
1561 struct rtentry *rt = NULL;
1562 char ip6buf[INET6_ADDRSTRLEN];
1563 struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
1564
1565 /* sanity check */
1566 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1567 nd6log((LOG_ERR,
1568 "nd6_prefix_onlink: %s/%d is already on-link\n",
1569 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1570 pr->ndpr_plen));
1571 return (EEXIST);
1572 }
1573
1574 /*
1575 * Add the interface route associated with the prefix. Before
1576 * installing the route, check if there's the same prefix on another
1577 * interface, and the prefix has already installed the interface route.
1578 * Although such a configuration is expected to be rare, we explicitly
1579 * allow it.
1580 */
1581 for (opr = V_nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1582 if (opr == pr)
1583 continue;
1584
1585 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
1586 continue;
1587
1588 if (opr->ndpr_plen == pr->ndpr_plen &&
1589 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1590 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen))
1591 return (0);
1592 }
1593
1594 /*
1595 * We prefer link-local addresses as the associated interface address.
1596 */
1597 /* search for a link-local addr */
1598 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
1599 IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
1600 if (ifa == NULL) {
1601 /* XXX: freebsd does not have ifa_ifwithaf */
1602 IF_ADDR_LOCK(ifp);
1603 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1604 if (ifa->ifa_addr->sa_family == AF_INET6)
1605 break;
1606 }
1607 if (ifa != NULL)
1608 ifa_ref(ifa);
1609 IF_ADDR_UNLOCK(ifp);
1610 /* should we care about ia6_flags? */
1611 }
1612 if (ifa == NULL) {
1613 /*
1614 * This can still happen, when, for example, we receive an RA
1615 * containing a prefix with the L bit set and the A bit clear,
1616 * after removing all IPv6 addresses on the receiving
1617 * interface. This should, of course, be rare though.
1618 */
1619 nd6log((LOG_NOTICE,
1620 "nd6_prefix_onlink: failed to find any ifaddr"
1621 " to add route for a prefix(%s/%d) on %s\n",
1622 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1623 pr->ndpr_plen, if_name(ifp)));
1624 return (0);
1625 }
1626
1627 /*
1628 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1629 * ifa->ifa_rtrequest = nd6_rtrequest;
1630 */
1631 bzero(&mask6, sizeof(mask6));
1632 mask6.sin6_len = sizeof(mask6);
1633 mask6.sin6_addr = pr->ndpr_mask;
1634 rtflags = (ifa->ifa_flags & ~IFA_RTSELF) | RTF_UP;
1635 error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix,
1636 ifa->ifa_addr, (struct sockaddr *)&mask6, rtflags, &rt);
1637 if (error == 0) {
1638 if (rt != NULL) /* this should be non NULL, though */ {
1639 rnh = rt_tables_get_rnh(rt->rt_fibnum, AF_INET6);
1640 /* XXX what if rhn == NULL? */
1641 RADIX_NODE_HEAD_LOCK(rnh);
1642 RT_LOCK(rt);
1643 if (!rt_setgate(rt, rt_key(rt), (struct sockaddr *)&null_sdl)) {
1644 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type =
1645 rt->rt_ifp->if_type;
1646 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index =
1647 rt->rt_ifp->if_index;
1648 }
1649 RADIX_NODE_HEAD_UNLOCK(rnh);
1650 nd6_rtmsg(RTM_ADD, rt);
1651 RT_UNLOCK(rt);
1652 }
1653 pr->ndpr_stateflags |= NDPRF_ONLINK;
1654 } else {
1655 char ip6bufg[INET6_ADDRSTRLEN], ip6bufm[INET6_ADDRSTRLEN];
1656 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a"
1657 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
1658 "errno = %d\n",
1659 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1660 pr->ndpr_plen, if_name(ifp),
1661 ip6_sprintf(ip6bufg, &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
1662 ip6_sprintf(ip6bufm, &mask6.sin6_addr), rtflags, error));
1663 }
1664
1665 if (rt != NULL) {
1666 RT_LOCK(rt);
1667 RT_REMREF(rt);
1668 RT_UNLOCK(rt);
1669 }
1670 if (ifa != NULL)
1671 ifa_free(ifa);
1672
1673 return (error);
1674}
1675
1676int
1677nd6_prefix_offlink(struct nd_prefix *pr)
1678{
1679 int error = 0;
1680 struct ifnet *ifp = pr->ndpr_ifp;
1681 struct nd_prefix *opr;
1682 struct sockaddr_in6 sa6, mask6;
1683 struct rtentry *rt = NULL;
1684 char ip6buf[INET6_ADDRSTRLEN];
1685
1686 /* sanity check */
1687 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1688 nd6log((LOG_ERR,
1689 "nd6_prefix_offlink: %s/%d is already off-link\n",
1690 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1691 pr->ndpr_plen));
1692 return (EEXIST);
1693 }
1694
1695 bzero(&sa6, sizeof(sa6));
1696 sa6.sin6_family = AF_INET6;
1697 sa6.sin6_len = sizeof(sa6);
1698 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
1699 sizeof(struct in6_addr));
1700 bzero(&mask6, sizeof(mask6));
1701 mask6.sin6_family = AF_INET6;
1702 mask6.sin6_len = sizeof(sa6);
1703 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
1704 error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
1705 (struct sockaddr *)&mask6, 0, &rt);
1706 if (error == 0) {
1707 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
1708
1709 /* report the route deletion to the routing socket. */
1710 if (rt != NULL)
1711 nd6_rtmsg(RTM_DELETE, rt);
1712
1713 /*
1714 * There might be the same prefix on another interface,
1715 * the prefix which could not be on-link just because we have
1716 * the interface route (see comments in nd6_prefix_onlink).
1717 * If there's one, try to make the prefix on-link on the
1718 * interface.
1719 */
1720 for (opr = V_nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1721 if (opr == pr)
1722 continue;
1723
1724 if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
1725 continue;
1726
1727 /*
1728 * KAME specific: detached prefixes should not be
1729 * on-link.
1730 */
1731 if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1732 continue;
1733
1734 if (opr->ndpr_plen == pr->ndpr_plen &&
1735 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1736 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
1737 int e;
1738
1739 if ((e = nd6_prefix_onlink(opr)) != 0) {
1740 nd6log((LOG_ERR,
1741 "nd6_prefix_offlink: failed to "
1742 "recover a prefix %s/%d from %s "
1743 "to %s (errno = %d)\n",
1744 ip6_sprintf(ip6buf,
1745 &opr->ndpr_prefix.sin6_addr),
1746 opr->ndpr_plen, if_name(ifp),
1747 if_name(opr->ndpr_ifp), e));
1748 }
1749 }
1750 }
1751 } else {
1752 /* XXX: can we still set the NDPRF_ONLINK flag? */
1753 nd6log((LOG_ERR,
1754 "nd6_prefix_offlink: failed to delete route: "
1755 "%s/%d on %s (errno = %d)\n",
1756 ip6_sprintf(ip6buf, &sa6.sin6_addr), pr->ndpr_plen,
1757 if_name(ifp), error));
1758 }
1759
1760 if (rt != NULL) {
1761 RTFREE(rt);
1762 }
1763
1764 return (error);
1765}
1766
1767static struct in6_ifaddr *
1768in6_ifadd(struct nd_prefixctl *pr, int mcast)
1769{
1770 struct ifnet *ifp = pr->ndpr_ifp;
1771 struct ifaddr *ifa;
1772 struct in6_aliasreq ifra;
1773 struct in6_ifaddr *ia, *ib;
1774 int error, plen0;
1775 struct in6_addr mask;
1776 int prefixlen = pr->ndpr_plen;
1777 int updateflags;
1778 char ip6buf[INET6_ADDRSTRLEN];
1779
1780 in6_prefixlen2mask(&mask, prefixlen);
1781
1782 /*
1783 * find a link-local address (will be interface ID).
1784 * Is it really mandatory? Theoretically, a global or a site-local
1785 * address can be configured without a link-local address, if we
1786 * have a unique interface identifier...
1787 *
1788 * it is not mandatory to have a link-local address, we can generate
1789 * interface identifier on the fly. we do this because:
1790 * (1) it should be the easiest way to find interface identifier.
1791 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1792 * for multiple addresses on a single interface, and possible shortcut
1793 * of DAD. we omitted DAD for this reason in the past.
1794 * (3) a user can prevent autoconfiguration of global address
1795 * by removing link-local address by hand (this is partly because we
1796 * don't have other way to control the use of IPv6 on an interface.
1797 * this has been our design choice - cf. NRL's "ifconfig auto").
1798 * (4) it is easier to manage when an interface has addresses
1799 * with the same interface identifier, than to have multiple addresses
1800 * with different interface identifiers.
1801 */
1802 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
1803 if (ifa)
1804 ib = (struct in6_ifaddr *)ifa;
1805 else
1806 return NULL;
1807
1808 /* prefixlen + ifidlen must be equal to 128 */
1809 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
1810 if (prefixlen != plen0) {
1811 ifa_free(ifa);
1812 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
1813 "(prefix=%d ifid=%d)\n",
1814 if_name(ifp), prefixlen, 128 - plen0));
1815 return NULL;
1816 }
1817
1818 /* make ifaddr */
1819
1820 bzero(&ifra, sizeof(ifra));
1821 /*
1822 * in6_update_ifa() does not use ifra_name, but we accurately set it
1823 * for safety.
1824 */
1825 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1826 ifra.ifra_addr.sin6_family = AF_INET6;
1827 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
1828 /* prefix */
1829 ifra.ifra_addr.sin6_addr = pr->ndpr_prefix.sin6_addr;
1830 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
1831 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
1832 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
1833 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
1834
1835 /* interface ID */
1836 ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
1837 (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
1838 ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
1839 (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
1840 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
1841 (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
1842 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
1843 (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
1844 ifa_free(ifa);
1845
1846 /* new prefix mask. */
1847 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1848 ifra.ifra_prefixmask.sin6_family = AF_INET6;
1849 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
1850 sizeof(ifra.ifra_prefixmask.sin6_addr));
1851
1852 /* lifetimes. */
1853 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
1854 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
1855
1856 /* XXX: scope zone ID? */
1857
1858 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
1859
1860 /*
1861 * Make sure that we do not have this address already. This should
1862 * usually not happen, but we can still see this case, e.g., if we
1863 * have manually configured the exact address to be configured.
1864 */
1865 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
1866 &ifra.ifra_addr.sin6_addr);
1867 if (ifa != NULL) {
1868 ifa_free(ifa);
1869 /* this should be rare enough to make an explicit log */
1870 log(LOG_INFO, "in6_ifadd: %s is already configured\n",
1871 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr));
1872 return (NULL);
1873 }
1874
1875 /*
1876 * Allocate ifaddr structure, link into chain, etc.
1877 * If we are going to create a new address upon receiving a multicasted
1878 * RA, we need to impose a random delay before starting DAD.
1879 * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2]
1880 */
1881 updateflags = 0;
1882 if (mcast)
1883 updateflags |= IN6_IFAUPDATE_DADDELAY;
1884 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) {
1885 nd6log((LOG_ERR,
1886 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
1887 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr),
1888 if_name(ifp), error));
1889 return (NULL); /* ifaddr must not have been allocated. */
1890 }
1891
1892 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1893 /*
1894 * XXXRW: Assumption of non-NULLness here might not be true with
1895 * fine-grained locking -- should we validate it? Or just return
1896 * earlier ifa rather than looking it up again?
1897 */
1898 return (ia); /* this is always non-NULL and referenced. */
1899}
1900
1901/*
1902 * ia0 - corresponding public address
1903 */
1904int
1905in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay)
1906{
1907 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
1908 struct in6_ifaddr *newia, *ia;
1909 struct in6_aliasreq ifra;
1910 int i, error;
1911 int trylimit = 3; /* XXX: adhoc value */
1912 int updateflags;
1913 u_int32_t randid[2];
1914 time_t vltime0, pltime0;
1915
1916 bzero(&ifra, sizeof(ifra));
1917 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1918 ifra.ifra_addr = ia0->ia_addr;
1919 /* copy prefix mask */
1920 ifra.ifra_prefixmask = ia0->ia_prefixmask;
1921 /* clear the old IFID */
1922 for (i = 0; i < 4; i++) {
1923 ifra.ifra_addr.sin6_addr.s6_addr32[i] &=
1924 ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
1925 }
1926
1927 again:
1928 if (in6_get_tmpifid(ifp, (u_int8_t *)randid,
1929 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) {
1930 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find a good "
1931 "random IFID\n"));
1932 return (EINVAL);
1933 }
1934 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
1935 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
1936 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
1937 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
1938
1939 /*
1940 * in6_get_tmpifid() quite likely provided a unique interface ID.
1941 * However, we may still have a chance to see collision, because
1942 * there may be a time lag between generation of the ID and generation
1943 * of the address. So, we'll do one more sanity check.
1944 */
1945 IN6_IFADDR_RLOCK();
1946 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
1947 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
1948 &ifra.ifra_addr.sin6_addr)) {
1949 if (trylimit-- == 0) {
1950 IN6_IFADDR_RUNLOCK();
1951 /*
1952 * Give up. Something strange should have
1953 * happened.
1954 */
1955 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to "
1956 "find a unique random IFID\n"));
1957 return (EEXIST);
1958 }
1959 IN6_IFADDR_RUNLOCK();
1960 forcegen = 1;
1961 goto again;
1962 }
1963 }
1964 IN6_IFADDR_RUNLOCK();
1965
1966 /*
1967 * The Valid Lifetime is the lower of the Valid Lifetime of the
1968 * public address or TEMP_VALID_LIFETIME.
1969 * The Preferred Lifetime is the lower of the Preferred Lifetime
1970 * of the public address or TEMP_PREFERRED_LIFETIME -
1971 * DESYNC_FACTOR.
1972 */
1973 if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1974 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
1975 (ia0->ia6_lifetime.ia6t_vltime -
1976 (time_second - ia0->ia6_updatetime));
1977 if (vltime0 > V_ip6_temp_valid_lifetime)
1978 vltime0 = V_ip6_temp_valid_lifetime;
1979 } else
1980 vltime0 = V_ip6_temp_valid_lifetime;
1981 if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1982 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
1983 (ia0->ia6_lifetime.ia6t_pltime -
1984 (time_second - ia0->ia6_updatetime));
1985 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){
1986 pltime0 = V_ip6_temp_preferred_lifetime -
1987 V_ip6_desync_factor;
1988 }
1989 } else
1990 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor;
1991 ifra.ifra_lifetime.ia6t_vltime = vltime0;
1992 ifra.ifra_lifetime.ia6t_pltime = pltime0;
1993
1994 /*
1995 * A temporary address is created only if this calculated Preferred
1996 * Lifetime is greater than REGEN_ADVANCE time units.
1997 */
1998 if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance)
1999 return (0);
2000
2001 /* XXX: scope zone ID? */
2002
2003 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
2004
2005 /* allocate ifaddr structure, link into chain, etc. */
2006 updateflags = 0;
2007 if (delay)
2008 updateflags |= IN6_IFAUPDATE_DADDELAY;
2009 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0)
2010 return (error);
2011
2012 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
2013 if (newia == NULL) { /* XXX: can it happen? */
2014 nd6log((LOG_ERR,
2015 "in6_tmpifadd: ifa update succeeded, but we got "
2016 "no ifaddr\n"));
2017 return (EINVAL); /* XXX */
2018 }
2019 newia->ia6_ndpr = ia0->ia6_ndpr;
2020 newia->ia6_ndpr->ndpr_refcnt++;
2021 ifa_free(&newia->ia_ifa);
2022
2023 /*
2024 * A newly added address might affect the status of other addresses.
2025 * XXX: when the temporary address is generated with a new public
2026 * address, the onlink check is redundant. However, it would be safe
2027 * to do the check explicitly everywhere a new address is generated,
2028 * and, in fact, we surely need the check when we create a new
2029 * temporary address due to deprecation of an old temporary address.
2030 */
2031 pfxlist_onlink_check();
2032
2033 return (0);
2034}
2035
2036static int
2037in6_init_prefix_ltimes(struct nd_prefix *ndpr)
2038{
2039 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
2040 ndpr->ndpr_preferred = 0;
2041 else
2042 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime;
2043 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
2044 ndpr->ndpr_expire = 0;
2045 else
2046 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime;
2047
2048 return 0;
2049}
2050
2051static void
2052in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
2053{
2054 /* init ia6t_expire */
2055 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
2056 lt6->ia6t_expire = 0;
2057 else {
2058 lt6->ia6t_expire = time_second;
2059 lt6->ia6t_expire += lt6->ia6t_vltime;
2060 }
2061
2062 /* init ia6t_preferred */
2063 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
2064 lt6->ia6t_preferred = 0;
2065 else {
2066 lt6->ia6t_preferred = time_second;
2067 lt6->ia6t_preferred += lt6->ia6t_pltime;
2068 }
2069}
2070
2071/*
2072 * Delete all the routing table entries that use the specified gateway.
2073 * XXX: this function causes search through all entries of routing table, so
2074 * it shouldn't be called when acting as a router.
2075 */
2076void
2077rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
2078{
2079 struct radix_node_head *rnh;
2080 int s = splnet();
2081
2082 /* We'll care only link-local addresses */
2083 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) {
2084 splx(s);
2085 return;
2086 }
2087
2088 rnh = rt_tables_get_rnh(0, AF_INET6);
2089 if (rnh == NULL)
2090 return;
2091
2092 RADIX_NODE_HEAD_LOCK(rnh);
2093 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
2094 RADIX_NODE_HEAD_UNLOCK(rnh);
2095 splx(s);
2096}
2097
2098static int
2099rt6_deleteroute(struct radix_node *rn, void *arg)
2100{
2101#define SIN6(s) ((struct sockaddr_in6 *)s)
2102 struct rtentry *rt = (struct rtentry *)rn;
2103 struct in6_addr *gate = (struct in6_addr *)arg;
2104
2105 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
2106 return (0);
2107
2108 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) {
2109 return (0);
2110 }
2111
2112 /*
2113 * Do not delete a static route.
2114 * XXX: this seems to be a bit ad-hoc. Should we consider the
2115 * 'cloned' bit instead?
2116 */
2117 if ((rt->rt_flags & RTF_STATIC) != 0)
2118 return (0);
2119
2120 /*
2121 * We delete only host route. This means, in particular, we don't
2122 * delete default route.
2123 */
2124 if ((rt->rt_flags & RTF_HOST) == 0)
2125 return (0);
2126
2127 return (rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
2128 rt_mask(rt), rt->rt_flags, 0));
2129#undef SIN6
2130}
2131
2132int
2133nd6_setdefaultiface(int ifindex)
2134{
2135 int error = 0;
2136
2137 if (ifindex < 0 || V_if_index < ifindex)
2138 return (EINVAL);
2139 if (ifindex != 0 && !ifnet_byindex(ifindex))
2140 return (EINVAL);
2141
2142 if (V_nd6_defifindex != ifindex) {
2143 V_nd6_defifindex = ifindex;
2144 if (V_nd6_defifindex > 0)
2145 V_nd6_defifp = ifnet_byindex(V_nd6_defifindex);
2146 else
2147 V_nd6_defifp = NULL;
2148
2149 /*
2150 * Our current implementation assumes one-to-one maping between
2151 * interfaces and links, so it would be natural to use the
2152 * default interface as the default link.
2153 */
2154 scope6_setdefault(V_nd6_defifp);
2155 }
2156
2157 return (error);
2158}
| 93VNET_DEFINE(int, nd6_defifindex);
94#define V_nd6_defifp VNET(nd6_defifp)
95
96VNET_DEFINE(int, ip6_use_tempaddr) = 0;
97
98VNET_DEFINE(int, ip6_desync_factor);
99VNET_DEFINE(u_int32_t, ip6_temp_preferred_lifetime) = DEF_TEMP_PREFERRED_LIFETIME;
100VNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime) = DEF_TEMP_VALID_LIFETIME;
101
102VNET_DEFINE(int, ip6_temp_regen_advance) = TEMPADDR_REGEN_ADVANCE;
103
104/* RTPREF_MEDIUM has to be 0! */
105#define RTPREF_HIGH 1
106#define RTPREF_MEDIUM 0
107#define RTPREF_LOW (-1)
108#define RTPREF_RESERVED (-2)
109#define RTPREF_INVALID (-3) /* internal */
110
111/*
112 * Receive Router Solicitation Message - just for routers.
113 * Router solicitation/advertisement is mostly managed by userland program
114 * (rtadvd) so here we have no function like nd6_ra_output().
115 *
116 * Based on RFC 2461
117 */
118void
119nd6_rs_input(struct mbuf *m, int off, int icmp6len)
120{
121 struct ifnet *ifp = m->m_pkthdr.rcvif;
122 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
123 struct nd_router_solicit *nd_rs;
124 struct in6_addr saddr6 = ip6->ip6_src;
125 char *lladdr = NULL;
126 int lladdrlen = 0;
127 union nd_opts ndopts;
128 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
129
130 /* If I'm not a router, ignore it. */
131 if (!V_ip6_forwarding)
132 goto freeit;
133
134 /* Sanity checks */
135 if (ip6->ip6_hlim != 255) {
136 nd6log((LOG_ERR,
137 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
138 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
139 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
140 goto bad;
141 }
142
143 /*
144 * Don't update the neighbor cache, if src = ::.
145 * This indicates that the src has no IP address assigned yet.
146 */
147 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
148 goto freeit;
149
150#ifndef PULLDOWN_TEST
151 IP6_EXTHDR_CHECK(m, off, icmp6len,);
152 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
153#else
154 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
155 if (nd_rs == NULL) {
156 ICMP6STAT_INC(icp6s_tooshort);
157 return;
158 }
159#endif
160
161 icmp6len -= sizeof(*nd_rs);
162 nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
163 if (nd6_options(&ndopts) < 0) {
164 nd6log((LOG_INFO,
165 "nd6_rs_input: invalid ND option, ignored\n"));
166 /* nd6_options have incremented stats */
167 goto freeit;
168 }
169
170 if (ndopts.nd_opts_src_lladdr) {
171 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
172 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
173 }
174
175 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
176 nd6log((LOG_INFO,
177 "nd6_rs_input: lladdrlen mismatch for %s "
178 "(if %d, RS packet %d)\n",
179 ip6_sprintf(ip6bufs, &saddr6),
180 ifp->if_addrlen, lladdrlen - 2));
181 goto bad;
182 }
183
184 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
185
186 freeit:
187 m_freem(m);
188 return;
189
190 bad:
191 ICMP6STAT_INC(icp6s_badrs);
192 m_freem(m);
193}
194
195/*
196 * Receive Router Advertisement Message.
197 *
198 * Based on RFC 2461
199 * TODO: on-link bit on prefix information
200 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
201 */
202void
203nd6_ra_input(struct mbuf *m, int off, int icmp6len)
204{
205 struct ifnet *ifp = m->m_pkthdr.rcvif;
206 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
207 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
208 struct nd_router_advert *nd_ra;
209 struct in6_addr saddr6 = ip6->ip6_src;
210 int mcast = 0;
211 union nd_opts ndopts;
212 struct nd_defrouter *dr;
213 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
214
215 /*
216 * We only accept RAs only when
217 * the node is not a router and
218 * per-interface variable allows RAs on the receiving interface.
219 */
220 if (V_ip6_forwarding || !(ndi->flags & ND6_IFF_ACCEPT_RTADV))
221 goto freeit;
222
223 if (ip6->ip6_hlim != 255) {
224 nd6log((LOG_ERR,
225 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
226 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
227 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
228 goto bad;
229 }
230
231 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
232 nd6log((LOG_ERR,
233 "nd6_ra_input: src %s is not link-local\n",
234 ip6_sprintf(ip6bufs, &saddr6)));
235 goto bad;
236 }
237
238#ifndef PULLDOWN_TEST
239 IP6_EXTHDR_CHECK(m, off, icmp6len,);
240 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
241#else
242 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
243 if (nd_ra == NULL) {
244 ICMP6STAT_INC(icp6s_tooshort);
245 return;
246 }
247#endif
248
249 icmp6len -= sizeof(*nd_ra);
250 nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
251 if (nd6_options(&ndopts) < 0) {
252 nd6log((LOG_INFO,
253 "nd6_ra_input: invalid ND option, ignored\n"));
254 /* nd6_options have incremented stats */
255 goto freeit;
256 }
257
258 {
259 struct nd_defrouter dr0;
260 u_int32_t advreachable = nd_ra->nd_ra_reachable;
261
262 /* remember if this is a multicasted advertisement */
263 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
264 mcast = 1;
265
266 bzero(&dr0, sizeof(dr0));
267 dr0.rtaddr = saddr6;
268 dr0.flags = nd_ra->nd_ra_flags_reserved;
269 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
270 dr0.expire = time_second + dr0.rtlifetime;
271 dr0.ifp = ifp;
272 /* unspecified or not? (RFC 2461 6.3.4) */
273 if (advreachable) {
274 advreachable = ntohl(advreachable);
275 if (advreachable <= MAX_REACHABLE_TIME &&
276 ndi->basereachable != advreachable) {
277 ndi->basereachable = advreachable;
278 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
279 ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */
280 }
281 }
282 if (nd_ra->nd_ra_retransmit)
283 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
284 if (nd_ra->nd_ra_curhoplimit)
285 ndi->chlim = nd_ra->nd_ra_curhoplimit;
286 dr = defrtrlist_update(&dr0);
287 }
288
289 /*
290 * prefix
291 */
292 if (ndopts.nd_opts_pi) {
293 struct nd_opt_hdr *pt;
294 struct nd_opt_prefix_info *pi = NULL;
295 struct nd_prefixctl pr;
296
297 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
298 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
299 pt = (struct nd_opt_hdr *)((caddr_t)pt +
300 (pt->nd_opt_len << 3))) {
301 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
302 continue;
303 pi = (struct nd_opt_prefix_info *)pt;
304
305 if (pi->nd_opt_pi_len != 4) {
306 nd6log((LOG_INFO,
307 "nd6_ra_input: invalid option "
308 "len %d for prefix information option, "
309 "ignored\n", pi->nd_opt_pi_len));
310 continue;
311 }
312
313 if (128 < pi->nd_opt_pi_prefix_len) {
314 nd6log((LOG_INFO,
315 "nd6_ra_input: invalid prefix "
316 "len %d for prefix information option, "
317 "ignored\n", pi->nd_opt_pi_prefix_len));
318 continue;
319 }
320
321 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
322 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
323 nd6log((LOG_INFO,
324 "nd6_ra_input: invalid prefix "
325 "%s, ignored\n",
326 ip6_sprintf(ip6bufs,
327 &pi->nd_opt_pi_prefix)));
328 continue;
329 }
330
331 bzero(&pr, sizeof(pr));
332 pr.ndpr_prefix.sin6_family = AF_INET6;
333 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
334 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
335 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
336
337 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
338 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
339 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
340 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
341 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
342 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
343 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
344 (void)prelist_update(&pr, dr, m, mcast);
345 }
346 }
347
348 /*
349 * MTU
350 */
351 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
352 u_long mtu;
353 u_long maxmtu;
354
355 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
356
357 /* lower bound */
358 if (mtu < IPV6_MMTU) {
359 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
360 "mtu=%lu sent from %s, ignoring\n",
361 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src)));
362 goto skip;
363 }
364
365 /* upper bound */
366 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
367 ? ndi->maxmtu : ifp->if_mtu;
368 if (mtu <= maxmtu) {
369 int change = (ndi->linkmtu != mtu);
370
371 ndi->linkmtu = mtu;
372 if (change) /* in6_maxmtu may change */
373 in6_setmaxmtu();
374 } else {
375 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
376 "mtu=%lu sent from %s; "
377 "exceeds maxmtu %lu, ignoring\n",
378 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu));
379 }
380 }
381
382 skip:
383
384 /*
385 * Source link layer address
386 */
387 {
388 char *lladdr = NULL;
389 int lladdrlen = 0;
390
391 if (ndopts.nd_opts_src_lladdr) {
392 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
393 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
394 }
395
396 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
397 nd6log((LOG_INFO,
398 "nd6_ra_input: lladdrlen mismatch for %s "
399 "(if %d, RA packet %d)\n", ip6_sprintf(ip6bufs, &saddr6),
400 ifp->if_addrlen, lladdrlen - 2));
401 goto bad;
402 }
403
404 nd6_cache_lladdr(ifp, &saddr6, lladdr,
405 lladdrlen, ND_ROUTER_ADVERT, 0);
406
407 /*
408 * Installing a link-layer address might change the state of the
409 * router's neighbor cache, which might also affect our on-link
410 * detection of adveritsed prefixes.
411 */
412 pfxlist_onlink_check();
413 }
414
415 freeit:
416 m_freem(m);
417 return;
418
419 bad:
420 ICMP6STAT_INC(icp6s_badra);
421 m_freem(m);
422}
423
424/*
425 * default router list proccessing sub routines
426 */
427
428/* tell the change to user processes watching the routing socket. */
429static void
430nd6_rtmsg(int cmd, struct rtentry *rt)
431{
432 struct rt_addrinfo info;
433 struct ifnet *ifp;
434 struct ifaddr *ifa;
435
436 bzero((caddr_t)&info, sizeof(info));
437 info.rti_info[RTAX_DST] = rt_key(rt);
438 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
439 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
440 ifp = rt->rt_ifp;
441 if (ifp != NULL) {
442 IF_ADDR_LOCK(ifp);
443 ifa = TAILQ_FIRST(&ifp->if_addrhead);
444 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
445 ifa_ref(ifa);
446 IF_ADDR_UNLOCK(ifp);
447 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
448 } else
449 ifa = NULL;
450
451 rt_missmsg(cmd, &info, rt->rt_flags, 0);
452 if (ifa != NULL)
453 ifa_free(ifa);
454}
455
456void
457defrouter_addreq(struct nd_defrouter *new)
458{
459 struct sockaddr_in6 def, mask, gate;
460 struct rtentry *newrt = NULL;
461 int s;
462 int error;
463
464 bzero(&def, sizeof(def));
465 bzero(&mask, sizeof(mask));
466 bzero(&gate, sizeof(gate));
467
468 def.sin6_len = mask.sin6_len = gate.sin6_len =
469 sizeof(struct sockaddr_in6);
470 def.sin6_family = gate.sin6_family = AF_INET6;
471 gate.sin6_addr = new->rtaddr;
472
473 s = splnet();
474 error = rtrequest(RTM_ADD, (struct sockaddr *)&def,
475 (struct sockaddr *)&gate, (struct sockaddr *)&mask,
476 RTF_GATEWAY, &newrt);
477 if (newrt) {
478 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
479 RTFREE(newrt);
480 }
481 if (error == 0)
482 new->installed = 1;
483 splx(s);
484 return;
485}
486
487struct nd_defrouter *
488defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
489{
490 struct nd_defrouter *dr;
491
492 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
493 dr = TAILQ_NEXT(dr, dr_entry)) {
494 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
495 return (dr);
496 }
497
498 return (NULL); /* search failed */
499}
500
501/*
502 * Remove the default route for a given router.
503 * This is just a subroutine function for defrouter_select(), and should
504 * not be called from anywhere else.
505 */
506static void
507defrouter_delreq(struct nd_defrouter *dr)
508{
509 struct sockaddr_in6 def, mask, gate;
510 struct rtentry *oldrt = NULL;
511
512 bzero(&def, sizeof(def));
513 bzero(&mask, sizeof(mask));
514 bzero(&gate, sizeof(gate));
515
516 def.sin6_len = mask.sin6_len = gate.sin6_len =
517 sizeof(struct sockaddr_in6);
518 def.sin6_family = gate.sin6_family = AF_INET6;
519 gate.sin6_addr = dr->rtaddr;
520
521 rtrequest(RTM_DELETE, (struct sockaddr *)&def,
522 (struct sockaddr *)&gate,
523 (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt);
524 if (oldrt) {
525 nd6_rtmsg(RTM_DELETE, oldrt);
526 RTFREE(oldrt);
527 }
528
529 dr->installed = 0;
530}
531
532/*
533 * remove all default routes from default router list
534 */
535void
536defrouter_reset(void)
537{
538 struct nd_defrouter *dr;
539
540 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
541 dr = TAILQ_NEXT(dr, dr_entry))
542 defrouter_delreq(dr);
543
544 /*
545 * XXX should we also nuke any default routers in the kernel, by
546 * going through them by rtalloc1()?
547 */
548}
549
550void
551defrtrlist_del(struct nd_defrouter *dr)
552{
553 struct nd_defrouter *deldr = NULL;
554 struct nd_prefix *pr;
555
556 /*
557 * Flush all the routing table entries that use the router
558 * as a next hop.
559 */
560 if (!V_ip6_forwarding)
561 rt6_flush(&dr->rtaddr, dr->ifp);
562
563 if (dr->installed) {
564 deldr = dr;
565 defrouter_delreq(dr);
566 }
567 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
568
569 /*
570 * Also delete all the pointers to the router in each prefix lists.
571 */
572 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
573 struct nd_pfxrouter *pfxrtr;
574 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
575 pfxrtr_del(pfxrtr);
576 }
577 pfxlist_onlink_check();
578
579 /*
580 * If the router is the primary one, choose a new one.
581 * Note that defrouter_select() will remove the current gateway
582 * from the routing table.
583 */
584 if (deldr)
585 defrouter_select();
586
587 free(dr, M_IP6NDP);
588}
589
590/*
591 * Default Router Selection according to Section 6.3.6 of RFC 2461 and
592 * draft-ietf-ipngwg-router-selection:
593 * 1) Routers that are reachable or probably reachable should be preferred.
594 * If we have more than one (probably) reachable router, prefer ones
595 * with the highest router preference.
596 * 2) When no routers on the list are known to be reachable or
597 * probably reachable, routers SHOULD be selected in a round-robin
598 * fashion, regardless of router preference values.
599 * 3) If the Default Router List is empty, assume that all
600 * destinations are on-link.
601 *
602 * We assume nd_defrouter is sorted by router preference value.
603 * Since the code below covers both with and without router preference cases,
604 * we do not need to classify the cases by ifdef.
605 *
606 * At this moment, we do not try to install more than one default router,
607 * even when the multipath routing is available, because we're not sure about
608 * the benefits for stub hosts comparing to the risk of making the code
609 * complicated and the possibility of introducing bugs.
610 */
611void
612defrouter_select(void)
613{
614 int s = splnet();
615 struct nd_defrouter *dr, *selected_dr = NULL, *installed_dr = NULL;
616 struct llentry *ln = NULL;
617
618 /*
619 * This function should be called only when acting as an autoconfigured
620 * host. Although the remaining part of this function is not effective
621 * if the node is not an autoconfigured host, we explicitly exclude
622 * such cases here for safety.
623 */
624 if (V_ip6_forwarding) {
625 nd6log((LOG_WARNING,
626 "defrouter_select: called unexpectedly (forwarding=%d)\n",
627 V_ip6_forwarding));
628 splx(s);
629 return;
630 }
631
632 /*
633 * Let's handle easy case (3) first:
634 * If default router list is empty, there's nothing to be done.
635 */
636 if (!TAILQ_FIRST(&V_nd_defrouter)) {
637 splx(s);
638 return;
639 }
640
641 /*
642 * Search for a (probably) reachable router from the list.
643 * We just pick up the first reachable one (if any), assuming that
644 * the ordering rule of the list described in defrtrlist_update().
645 */
646 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
647 dr = TAILQ_NEXT(dr, dr_entry)) {
648 IF_AFDATA_LOCK(dr->ifp);
649 if (selected_dr == NULL &&
650 (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
651 ND6_IS_LLINFO_PROBREACH(ln)) {
652 selected_dr = dr;
653 }
654 IF_AFDATA_UNLOCK(dr->ifp);
655 if (ln != NULL) {
656 LLE_RUNLOCK(ln);
657 ln = NULL;
658 }
659
660 if (dr->installed && installed_dr == NULL)
661 installed_dr = dr;
662 else if (dr->installed && installed_dr) {
663 /* this should not happen. warn for diagnosis. */
664 log(LOG_ERR, "defrouter_select: more than one router"
665 " is installed\n");
666 }
667 }
668 /*
669 * If none of the default routers was found to be reachable,
670 * round-robin the list regardless of preference.
671 * Otherwise, if we have an installed router, check if the selected
672 * (reachable) router should really be preferred to the installed one.
673 * We only prefer the new router when the old one is not reachable
674 * or when the new one has a really higher preference value.
675 */
676 if (selected_dr == NULL) {
677 if (installed_dr == NULL || !TAILQ_NEXT(installed_dr, dr_entry))
678 selected_dr = TAILQ_FIRST(&V_nd_defrouter);
679 else
680 selected_dr = TAILQ_NEXT(installed_dr, dr_entry);
681 } else if (installed_dr) {
682 IF_AFDATA_LOCK(installed_dr->ifp);
683 if ((ln = nd6_lookup(&installed_dr->rtaddr, 0, installed_dr->ifp)) &&
684 ND6_IS_LLINFO_PROBREACH(ln) &&
685 rtpref(selected_dr) <= rtpref(installed_dr)) {
686 selected_dr = installed_dr;
687 }
688 IF_AFDATA_UNLOCK(installed_dr->ifp);
689 if (ln != NULL)
690 LLE_RUNLOCK(ln);
691 }
692
693 /*
694 * If the selected router is different than the installed one,
695 * remove the installed router and install the selected one.
696 * Note that the selected router is never NULL here.
697 */
698 if (installed_dr != selected_dr) {
699 if (installed_dr)
700 defrouter_delreq(installed_dr);
701 defrouter_addreq(selected_dr);
702 }
703
704 splx(s);
705 return;
706}
707
708/*
709 * for default router selection
710 * regards router-preference field as a 2-bit signed integer
711 */
712static int
713rtpref(struct nd_defrouter *dr)
714{
715 switch (dr->flags & ND_RA_FLAG_RTPREF_MASK) {
716 case ND_RA_FLAG_RTPREF_HIGH:
717 return (RTPREF_HIGH);
718 case ND_RA_FLAG_RTPREF_MEDIUM:
719 case ND_RA_FLAG_RTPREF_RSV:
720 return (RTPREF_MEDIUM);
721 case ND_RA_FLAG_RTPREF_LOW:
722 return (RTPREF_LOW);
723 default:
724 /*
725 * This case should never happen. If it did, it would mean a
726 * serious bug of kernel internal. We thus always bark here.
727 * Or, can we even panic?
728 */
729 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->flags);
730 return (RTPREF_INVALID);
731 }
732 /* NOTREACHED */
733}
734
735static struct nd_defrouter *
736defrtrlist_update(struct nd_defrouter *new)
737{
738 struct nd_defrouter *dr, *n;
739 int s = splnet();
740
741 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
742 /* entry exists */
743 if (new->rtlifetime == 0) {
744 defrtrlist_del(dr);
745 dr = NULL;
746 } else {
747 int oldpref = rtpref(dr);
748
749 /* override */
750 dr->flags = new->flags; /* xxx flag check */
751 dr->rtlifetime = new->rtlifetime;
752 dr->expire = new->expire;
753
754 /*
755 * If the preference does not change, there's no need
756 * to sort the entries.
757 */
758 if (rtpref(new) == oldpref) {
759 splx(s);
760 return (dr);
761 }
762
763 /*
764 * preferred router may be changed, so relocate
765 * this router.
766 * XXX: calling TAILQ_REMOVE directly is a bad manner.
767 * However, since defrtrlist_del() has many side
768 * effects, we intentionally do so here.
769 * defrouter_select() below will handle routing
770 * changes later.
771 */
772 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
773 n = dr;
774 goto insert;
775 }
776 splx(s);
777 return (dr);
778 }
779
780 /* entry does not exist */
781 if (new->rtlifetime == 0) {
782 splx(s);
783 return (NULL);
784 }
785
786 n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
787 if (n == NULL) {
788 splx(s);
789 return (NULL);
790 }
791 bzero(n, sizeof(*n));
792 *n = *new;
793
794insert:
795 /*
796 * Insert the new router in the Default Router List;
797 * The Default Router List should be in the descending order
798 * of router-preferece. Routers with the same preference are
799 * sorted in the arriving time order.
800 */
801
802 /* insert at the end of the group */
803 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
804 dr = TAILQ_NEXT(dr, dr_entry)) {
805 if (rtpref(n) > rtpref(dr))
806 break;
807 }
808 if (dr)
809 TAILQ_INSERT_BEFORE(dr, n, dr_entry);
810 else
811 TAILQ_INSERT_TAIL(&V_nd_defrouter, n, dr_entry);
812
813 defrouter_select();
814
815 splx(s);
816
817 return (n);
818}
819
820static struct nd_pfxrouter *
821pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
822{
823 struct nd_pfxrouter *search;
824
825 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
826 if (search->router == dr)
827 break;
828 }
829
830 return (search);
831}
832
833static void
834pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
835{
836 struct nd_pfxrouter *new;
837
838 new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
839 if (new == NULL)
840 return;
841 bzero(new, sizeof(*new));
842 new->router = dr;
843
844 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
845
846 pfxlist_onlink_check();
847}
848
849static void
850pfxrtr_del(struct nd_pfxrouter *pfr)
851{
852 LIST_REMOVE(pfr, pfr_entry);
853 free(pfr, M_IP6NDP);
854}
855
856struct nd_prefix *
857nd6_prefix_lookup(struct nd_prefixctl *key)
858{
859 struct nd_prefix *search;
860
861 for (search = V_nd_prefix.lh_first;
862 search; search = search->ndpr_next) {
863 if (key->ndpr_ifp == search->ndpr_ifp &&
864 key->ndpr_plen == search->ndpr_plen &&
865 in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr,
866 &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) {
867 break;
868 }
869 }
870
871 return (search);
872}
873
874int
875nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr,
876 struct nd_prefix **newp)
877{
878 struct nd_prefix *new = NULL;
879 int error = 0;
880 int i, s;
881 char ip6buf[INET6_ADDRSTRLEN];
882
883 new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
884 if (new == NULL)
885 return(ENOMEM);
886 bzero(new, sizeof(*new));
887 new->ndpr_ifp = pr->ndpr_ifp;
888 new->ndpr_prefix = pr->ndpr_prefix;
889 new->ndpr_plen = pr->ndpr_plen;
890 new->ndpr_vltime = pr->ndpr_vltime;
891 new->ndpr_pltime = pr->ndpr_pltime;
892 new->ndpr_flags = pr->ndpr_flags;
893 if ((error = in6_init_prefix_ltimes(new)) != 0) {
894 free(new, M_IP6NDP);
895 return(error);
896 }
897 new->ndpr_lastupdate = time_second;
898 if (newp != NULL)
899 *newp = new;
900
901 /* initialization */
902 LIST_INIT(&new->ndpr_advrtrs);
903 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
904 /* make prefix in the canonical form */
905 for (i = 0; i < 4; i++)
906 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
907 new->ndpr_mask.s6_addr32[i];
908
909 s = splnet();
910 /* link ndpr_entry to nd_prefix list */
911 LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry);
912 splx(s);
913
914 /* ND_OPT_PI_FLAG_ONLINK processing */
915 if (new->ndpr_raf_onlink) {
916 int e;
917
918 if ((e = nd6_prefix_onlink(new)) != 0) {
919 nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
920 "the prefix %s/%d on-link on %s (errno=%d)\n",
921 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
922 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
923 /* proceed anyway. XXX: is it correct? */
924 }
925 }
926
927 if (dr)
928 pfxrtr_add(new, dr);
929
930 return 0;
931}
932
933void
934prelist_remove(struct nd_prefix *pr)
935{
936 struct nd_pfxrouter *pfr, *next;
937 int e, s;
938 char ip6buf[INET6_ADDRSTRLEN];
939
940 /* make sure to invalidate the prefix until it is really freed. */
941 pr->ndpr_vltime = 0;
942 pr->ndpr_pltime = 0;
943
944 /*
945 * Though these flags are now meaningless, we'd rather keep the value
946 * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users
947 * when executing "ndp -p".
948 */
949
950 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
951 (e = nd6_prefix_offlink(pr)) != 0) {
952 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
953 "on %s, errno=%d\n",
954 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
955 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
956 /* what should we do? */
957 }
958
959 if (pr->ndpr_refcnt > 0)
960 return; /* notice here? */
961
962 s = splnet();
963
964 /* unlink ndpr_entry from nd_prefix list */
965 LIST_REMOVE(pr, ndpr_entry);
966
967 /* free list of routers that adversed the prefix */
968 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
969 next = pfr->pfr_next;
970
971 free(pfr, M_IP6NDP);
972 }
973 splx(s);
974
975 free(pr, M_IP6NDP);
976
977 pfxlist_onlink_check();
978}
979
980/*
981 * dr - may be NULL
982 */
983
984static int
985prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr,
986 struct mbuf *m, int mcast)
987{
988 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
989 struct ifaddr *ifa;
990 struct ifnet *ifp = new->ndpr_ifp;
991 struct nd_prefix *pr;
992 int s = splnet();
993 int error = 0;
994 int newprefix = 0;
995 int auth;
996 struct in6_addrlifetime lt6_tmp;
997 char ip6buf[INET6_ADDRSTRLEN];
998
999 auth = 0;
1000 if (m) {
1001 /*
1002 * Authenticity for NA consists authentication for
1003 * both IP header and IP datagrams, doesn't it ?
1004 */
1005#if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
1006 auth = ((m->m_flags & M_AUTHIPHDR) &&
1007 (m->m_flags & M_AUTHIPDGM));
1008#endif
1009 }
1010
1011 if ((pr = nd6_prefix_lookup(new)) != NULL) {
1012 /*
1013 * nd6_prefix_lookup() ensures that pr and new have the same
1014 * prefix on a same interface.
1015 */
1016
1017 /*
1018 * Update prefix information. Note that the on-link (L) bit
1019 * and the autonomous (A) bit should NOT be changed from 1
1020 * to 0.
1021 */
1022 if (new->ndpr_raf_onlink == 1)
1023 pr->ndpr_raf_onlink = 1;
1024 if (new->ndpr_raf_auto == 1)
1025 pr->ndpr_raf_auto = 1;
1026 if (new->ndpr_raf_onlink) {
1027 pr->ndpr_vltime = new->ndpr_vltime;
1028 pr->ndpr_pltime = new->ndpr_pltime;
1029 (void)in6_init_prefix_ltimes(pr); /* XXX error case? */
1030 pr->ndpr_lastupdate = time_second;
1031 }
1032
1033 if (new->ndpr_raf_onlink &&
1034 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1035 int e;
1036
1037 if ((e = nd6_prefix_onlink(pr)) != 0) {
1038 nd6log((LOG_ERR,
1039 "prelist_update: failed to make "
1040 "the prefix %s/%d on-link on %s "
1041 "(errno=%d)\n",
1042 ip6_sprintf(ip6buf,
1043 &pr->ndpr_prefix.sin6_addr),
1044 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
1045 /* proceed anyway. XXX: is it correct? */
1046 }
1047 }
1048
1049 if (dr && pfxrtr_lookup(pr, dr) == NULL)
1050 pfxrtr_add(pr, dr);
1051 } else {
1052 struct nd_prefix *newpr = NULL;
1053
1054 newprefix = 1;
1055
1056 if (new->ndpr_vltime == 0)
1057 goto end;
1058 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
1059 goto end;
1060
1061 error = nd6_prelist_add(new, dr, &newpr);
1062 if (error != 0 || newpr == NULL) {
1063 nd6log((LOG_NOTICE, "prelist_update: "
1064 "nd6_prelist_add failed for %s/%d on %s "
1065 "errno=%d, returnpr=%p\n",
1066 ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr),
1067 new->ndpr_plen, if_name(new->ndpr_ifp),
1068 error, newpr));
1069 goto end; /* we should just give up in this case. */
1070 }
1071
1072 /*
1073 * XXX: from the ND point of view, we can ignore a prefix
1074 * with the on-link bit being zero. However, we need a
1075 * prefix structure for references from autoconfigured
1076 * addresses. Thus, we explicitly make sure that the prefix
1077 * itself expires now.
1078 */
1079 if (newpr->ndpr_raf_onlink == 0) {
1080 newpr->ndpr_vltime = 0;
1081 newpr->ndpr_pltime = 0;
1082 in6_init_prefix_ltimes(newpr);
1083 }
1084
1085 pr = newpr;
1086 }
1087
1088 /*
1089 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1090 * Note that pr must be non NULL at this point.
1091 */
1092
1093 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1094 if (!new->ndpr_raf_auto)
1095 goto end;
1096
1097 /*
1098 * 5.5.3 (b). the link-local prefix should have been ignored in
1099 * nd6_ra_input.
1100 */
1101
1102 /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */
1103 if (new->ndpr_pltime > new->ndpr_vltime) {
1104 error = EINVAL; /* XXX: won't be used */
1105 goto end;
1106 }
1107
1108 /*
1109 * 5.5.3 (d). If the prefix advertised is not equal to the prefix of
1110 * an address configured by stateless autoconfiguration already in the
1111 * list of addresses associated with the interface, and the Valid
1112 * Lifetime is not 0, form an address. We first check if we have
1113 * a matching prefix.
1114 * Note: we apply a clarification in rfc2462bis-02 here. We only
1115 * consider autoconfigured addresses while RFC2462 simply said
1116 * "address".
1117 */
1118 IF_ADDR_LOCK(ifp);
1119 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1120 struct in6_ifaddr *ifa6;
1121 u_int32_t remaininglifetime;
1122
1123 if (ifa->ifa_addr->sa_family != AF_INET6)
1124 continue;
1125
1126 ifa6 = (struct in6_ifaddr *)ifa;
1127
1128 /*
1129 * We only consider autoconfigured addresses as per rfc2462bis.
1130 */
1131 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
1132 continue;
1133
1134 /*
1135 * Spec is not clear here, but I believe we should concentrate
1136 * on unicast (i.e. not anycast) addresses.
1137 * XXX: other ia6_flags? detached or duplicated?
1138 */
1139 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
1140 continue;
1141
1142 /*
1143 * Ignore the address if it is not associated with a prefix
1144 * or is associated with a prefix that is different from this
1145 * one. (pr is never NULL here)
1146 */
1147 if (ifa6->ia6_ndpr != pr)
1148 continue;
1149
1150 if (ia6_match == NULL) /* remember the first one */
1151 ia6_match = ifa6;
1152
1153 /*
1154 * An already autoconfigured address matched. Now that we
1155 * are sure there is at least one matched address, we can
1156 * proceed to 5.5.3. (e): update the lifetimes according to the
1157 * "two hours" rule and the privacy extension.
1158 * We apply some clarifications in rfc2462bis:
1159 * - use remaininglifetime instead of storedlifetime as a
1160 * variable name
1161 * - remove the dead code in the "two-hour" rule
1162 */
1163#define TWOHOUR (120*60)
1164 lt6_tmp = ifa6->ia6_lifetime;
1165
1166 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1167 remaininglifetime = ND6_INFINITE_LIFETIME;
1168 else if (time_second - ifa6->ia6_updatetime >
1169 lt6_tmp.ia6t_vltime) {
1170 /*
1171 * The case of "invalid" address. We should usually
1172 * not see this case.
1173 */
1174 remaininglifetime = 0;
1175 } else
1176 remaininglifetime = lt6_tmp.ia6t_vltime -
1177 (time_second - ifa6->ia6_updatetime);
1178
1179 /* when not updating, keep the current stored lifetime. */
1180 lt6_tmp.ia6t_vltime = remaininglifetime;
1181
1182 if (TWOHOUR < new->ndpr_vltime ||
1183 remaininglifetime < new->ndpr_vltime) {
1184 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1185 } else if (remaininglifetime <= TWOHOUR) {
1186 if (auth) {
1187 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1188 }
1189 } else {
1190 /*
1191 * new->ndpr_vltime <= TWOHOUR &&
1192 * TWOHOUR < remaininglifetime
1193 */
1194 lt6_tmp.ia6t_vltime = TWOHOUR;
1195 }
1196
1197 /* The 2 hour rule is not imposed for preferred lifetime. */
1198 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1199
1200 in6_init_address_ltimes(pr, <6_tmp);
1201
1202 /*
1203 * We need to treat lifetimes for temporary addresses
1204 * differently, according to
1205 * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1);
1206 * we only update the lifetimes when they are in the maximum
1207 * intervals.
1208 */
1209 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
1210 u_int32_t maxvltime, maxpltime;
1211
1212 if (V_ip6_temp_valid_lifetime >
1213 (u_int32_t)((time_second - ifa6->ia6_createtime) +
1214 V_ip6_desync_factor)) {
1215 maxvltime = V_ip6_temp_valid_lifetime -
1216 (time_second - ifa6->ia6_createtime) -
1217 V_ip6_desync_factor;
1218 } else
1219 maxvltime = 0;
1220 if (V_ip6_temp_preferred_lifetime >
1221 (u_int32_t)((time_second - ifa6->ia6_createtime) +
1222 V_ip6_desync_factor)) {
1223 maxpltime = V_ip6_temp_preferred_lifetime -
1224 (time_second - ifa6->ia6_createtime) -
1225 V_ip6_desync_factor;
1226 } else
1227 maxpltime = 0;
1228
1229 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME ||
1230 lt6_tmp.ia6t_vltime > maxvltime) {
1231 lt6_tmp.ia6t_vltime = maxvltime;
1232 }
1233 if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME ||
1234 lt6_tmp.ia6t_pltime > maxpltime) {
1235 lt6_tmp.ia6t_pltime = maxpltime;
1236 }
1237 }
1238 ifa6->ia6_lifetime = lt6_tmp;
1239 ifa6->ia6_updatetime = time_second;
1240 }
1241 IF_ADDR_UNLOCK(ifp);
1242 if (ia6_match == NULL && new->ndpr_vltime) {
1243 int ifidlen;
1244
1245 /*
1246 * 5.5.3 (d) (continued)
1247 * No address matched and the valid lifetime is non-zero.
1248 * Create a new address.
1249 */
1250
1251 /*
1252 * Prefix Length check:
1253 * If the sum of the prefix length and interface identifier
1254 * length does not equal 128 bits, the Prefix Information
1255 * option MUST be ignored. The length of the interface
1256 * identifier is defined in a separate link-type specific
1257 * document.
1258 */
1259 ifidlen = in6_if2idlen(ifp);
1260 if (ifidlen < 0) {
1261 /* this should not happen, so we always log it. */
1262 log(LOG_ERR, "prelist_update: IFID undefined (%s)\n",
1263 if_name(ifp));
1264 goto end;
1265 }
1266 if (ifidlen + pr->ndpr_plen != 128) {
1267 nd6log((LOG_INFO,
1268 "prelist_update: invalid prefixlen "
1269 "%d for %s, ignored\n",
1270 pr->ndpr_plen, if_name(ifp)));
1271 goto end;
1272 }
1273
1274 if ((ia6 = in6_ifadd(new, mcast)) != NULL) {
1275 /*
1276 * note that we should use pr (not new) for reference.
1277 */
1278 pr->ndpr_refcnt++;
1279 ia6->ia6_ndpr = pr;
1280
1281 /*
1282 * RFC 3041 3.3 (2).
1283 * When a new public address is created as described
1284 * in RFC2462, also create a new temporary address.
1285 *
1286 * RFC 3041 3.5.
1287 * When an interface connects to a new link, a new
1288 * randomized interface identifier should be generated
1289 * immediately together with a new set of temporary
1290 * addresses. Thus, we specifiy 1 as the 2nd arg of
1291 * in6_tmpifadd().
1292 */
1293 if (V_ip6_use_tempaddr) {
1294 int e;
1295 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) {
1296 nd6log((LOG_NOTICE, "prelist_update: "
1297 "failed to create a temporary "
1298 "address, errno=%d\n",
1299 e));
1300 }
1301 }
1302 ifa_free(&ia6->ia_ifa);
1303
1304 /*
1305 * A newly added address might affect the status
1306 * of other addresses, so we check and update it.
1307 * XXX: what if address duplication happens?
1308 */
1309 pfxlist_onlink_check();
1310 } else {
1311 /* just set an error. do not bark here. */
1312 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1313 }
1314 }
1315
1316 end:
1317 splx(s);
1318 return error;
1319}
1320
1321/*
1322 * A supplement function used in the on-link detection below;
1323 * detect if a given prefix has a (probably) reachable advertising router.
1324 * XXX: lengthy function name...
1325 */
1326static struct nd_pfxrouter *
1327find_pfxlist_reachable_router(struct nd_prefix *pr)
1328{
1329 struct nd_pfxrouter *pfxrtr;
1330 struct llentry *ln;
1331 int canreach;
1332
1333 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr != NULL;
1334 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
1335 IF_AFDATA_LOCK(pfxrtr->router->ifp);
1336 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp);
1337 IF_AFDATA_UNLOCK(pfxrtr->router->ifp);
1338 if (ln == NULL)
1339 continue;
1340 canreach = ND6_IS_LLINFO_PROBREACH(ln);
1341 LLE_RUNLOCK(ln);
1342 if (canreach)
1343 break;
1344 }
1345 return (pfxrtr);
1346}
1347
1348/*
1349 * Check if each prefix in the prefix list has at least one available router
1350 * that advertised the prefix (a router is "available" if its neighbor cache
1351 * entry is reachable or probably reachable).
1352 * If the check fails, the prefix may be off-link, because, for example,
1353 * we have moved from the network but the lifetime of the prefix has not
1354 * expired yet. So we should not use the prefix if there is another prefix
1355 * that has an available router.
1356 * But, if there is no prefix that has an available router, we still regards
1357 * all the prefixes as on-link. This is because we can't tell if all the
1358 * routers are simply dead or if we really moved from the network and there
1359 * is no router around us.
1360 */
1361void
1362pfxlist_onlink_check()
1363{
1364 struct nd_prefix *pr;
1365 struct in6_ifaddr *ifa;
1366 struct nd_defrouter *dr;
1367 struct nd_pfxrouter *pfxrtr = NULL;
1368
1369 /*
1370 * Check if there is a prefix that has a reachable advertising
1371 * router.
1372 */
1373 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1374 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1375 break;
1376 }
1377
1378 /*
1379 * If we have no such prefix, check whether we still have a router
1380 * that does not advertise any prefixes.
1381 */
1382 if (pr == NULL) {
1383 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
1384 dr = TAILQ_NEXT(dr, dr_entry)) {
1385 struct nd_prefix *pr0;
1386
1387 for (pr0 = V_nd_prefix.lh_first; pr0;
1388 pr0 = pr0->ndpr_next) {
1389 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
1390 break;
1391 }
1392 if (pfxrtr != NULL)
1393 break;
1394 }
1395 }
1396 if (pr != NULL || (TAILQ_FIRST(&V_nd_defrouter) && pfxrtr == NULL)) {
1397 /*
1398 * There is at least one prefix that has a reachable router,
1399 * or at least a router which probably does not advertise
1400 * any prefixes. The latter would be the case when we move
1401 * to a new link where we have a router that does not provide
1402 * prefixes and we configure an address by hand.
1403 * Detach prefixes which have no reachable advertising
1404 * router, and attach other prefixes.
1405 */
1406 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1407 /* XXX: a link-local prefix should never be detached */
1408 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1409 continue;
1410
1411 /*
1412 * we aren't interested in prefixes without the L bit
1413 * set.
1414 */
1415 if (pr->ndpr_raf_onlink == 0)
1416 continue;
1417
1418 if (pr->ndpr_raf_auto == 0)
1419 continue;
1420
1421 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1422 find_pfxlist_reachable_router(pr) == NULL)
1423 pr->ndpr_stateflags |= NDPRF_DETACHED;
1424 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1425 find_pfxlist_reachable_router(pr) != 0)
1426 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1427 }
1428 } else {
1429 /* there is no prefix that has a reachable router */
1430 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1431 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1432 continue;
1433
1434 if (pr->ndpr_raf_onlink == 0)
1435 continue;
1436
1437 if (pr->ndpr_raf_auto == 0)
1438 continue;
1439
1440 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1441 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1442 }
1443 }
1444
1445 /*
1446 * Remove each interface route associated with a (just) detached
1447 * prefix, and reinstall the interface route for a (just) attached
1448 * prefix. Note that all attempt of reinstallation does not
1449 * necessarily success, when a same prefix is shared among multiple
1450 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1451 * so we don't have to care about them.
1452 */
1453 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1454 int e;
1455 char ip6buf[INET6_ADDRSTRLEN];
1456
1457 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1458 continue;
1459
1460 if (pr->ndpr_raf_onlink == 0)
1461 continue;
1462
1463 if (pr->ndpr_raf_auto == 0)
1464 continue;
1465
1466 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1467 (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1468 if ((e = nd6_prefix_offlink(pr)) != 0) {
1469 nd6log((LOG_ERR,
1470 "pfxlist_onlink_check: failed to "
1471 "make %s/%d offlink, errno=%d\n",
1472 ip6_sprintf(ip6buf,
1473 &pr->ndpr_prefix.sin6_addr),
1474 pr->ndpr_plen, e));
1475 }
1476 }
1477 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1478 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 &&
1479 pr->ndpr_raf_onlink) {
1480 if ((e = nd6_prefix_onlink(pr)) != 0) {
1481 nd6log((LOG_ERR,
1482 "pfxlist_onlink_check: failed to "
1483 "make %s/%d onlink, errno=%d\n",
1484 ip6_sprintf(ip6buf,
1485 &pr->ndpr_prefix.sin6_addr),
1486 pr->ndpr_plen, e));
1487 }
1488 }
1489 }
1490
1491 /*
1492 * Changes on the prefix status might affect address status as well.
1493 * Make sure that all addresses derived from an attached prefix are
1494 * attached, and that all addresses derived from a detached prefix are
1495 * detached. Note, however, that a manually configured address should
1496 * always be attached.
1497 * The precise detection logic is same as the one for prefixes.
1498 *
1499 * XXXRW: in6_ifaddrhead locking.
1500 */
1501 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1502 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1503 continue;
1504
1505 if (ifa->ia6_ndpr == NULL) {
1506 /*
1507 * This can happen when we first configure the address
1508 * (i.e. the address exists, but the prefix does not).
1509 * XXX: complicated relationships...
1510 */
1511 continue;
1512 }
1513
1514 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1515 break;
1516 }
1517 if (ifa) {
1518 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1519 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1520 continue;
1521
1522 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1523 continue;
1524
1525 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) {
1526 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1527 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1528 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1529 nd6_dad_start((struct ifaddr *)ifa, 0);
1530 }
1531 } else {
1532 ifa->ia6_flags |= IN6_IFF_DETACHED;
1533 }
1534 }
1535 }
1536 else {
1537 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1538 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1539 continue;
1540
1541 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1542 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1543 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1544 /* Do we need a delay in this case? */
1545 nd6_dad_start((struct ifaddr *)ifa, 0);
1546 }
1547 }
1548 }
1549}
1550
1551int
1552nd6_prefix_onlink(struct nd_prefix *pr)
1553{
1554 struct ifaddr *ifa;
1555 struct ifnet *ifp = pr->ndpr_ifp;
1556 struct sockaddr_in6 mask6;
1557 struct nd_prefix *opr;
1558 u_long rtflags;
1559 int error = 0;
1560 struct radix_node_head *rnh;
1561 struct rtentry *rt = NULL;
1562 char ip6buf[INET6_ADDRSTRLEN];
1563 struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
1564
1565 /* sanity check */
1566 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1567 nd6log((LOG_ERR,
1568 "nd6_prefix_onlink: %s/%d is already on-link\n",
1569 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1570 pr->ndpr_plen));
1571 return (EEXIST);
1572 }
1573
1574 /*
1575 * Add the interface route associated with the prefix. Before
1576 * installing the route, check if there's the same prefix on another
1577 * interface, and the prefix has already installed the interface route.
1578 * Although such a configuration is expected to be rare, we explicitly
1579 * allow it.
1580 */
1581 for (opr = V_nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1582 if (opr == pr)
1583 continue;
1584
1585 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
1586 continue;
1587
1588 if (opr->ndpr_plen == pr->ndpr_plen &&
1589 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1590 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen))
1591 return (0);
1592 }
1593
1594 /*
1595 * We prefer link-local addresses as the associated interface address.
1596 */
1597 /* search for a link-local addr */
1598 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
1599 IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
1600 if (ifa == NULL) {
1601 /* XXX: freebsd does not have ifa_ifwithaf */
1602 IF_ADDR_LOCK(ifp);
1603 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1604 if (ifa->ifa_addr->sa_family == AF_INET6)
1605 break;
1606 }
1607 if (ifa != NULL)
1608 ifa_ref(ifa);
1609 IF_ADDR_UNLOCK(ifp);
1610 /* should we care about ia6_flags? */
1611 }
1612 if (ifa == NULL) {
1613 /*
1614 * This can still happen, when, for example, we receive an RA
1615 * containing a prefix with the L bit set and the A bit clear,
1616 * after removing all IPv6 addresses on the receiving
1617 * interface. This should, of course, be rare though.
1618 */
1619 nd6log((LOG_NOTICE,
1620 "nd6_prefix_onlink: failed to find any ifaddr"
1621 " to add route for a prefix(%s/%d) on %s\n",
1622 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1623 pr->ndpr_plen, if_name(ifp)));
1624 return (0);
1625 }
1626
1627 /*
1628 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1629 * ifa->ifa_rtrequest = nd6_rtrequest;
1630 */
1631 bzero(&mask6, sizeof(mask6));
1632 mask6.sin6_len = sizeof(mask6);
1633 mask6.sin6_addr = pr->ndpr_mask;
1634 rtflags = (ifa->ifa_flags & ~IFA_RTSELF) | RTF_UP;
1635 error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix,
1636 ifa->ifa_addr, (struct sockaddr *)&mask6, rtflags, &rt);
1637 if (error == 0) {
1638 if (rt != NULL) /* this should be non NULL, though */ {
1639 rnh = rt_tables_get_rnh(rt->rt_fibnum, AF_INET6);
1640 /* XXX what if rhn == NULL? */
1641 RADIX_NODE_HEAD_LOCK(rnh);
1642 RT_LOCK(rt);
1643 if (!rt_setgate(rt, rt_key(rt), (struct sockaddr *)&null_sdl)) {
1644 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type =
1645 rt->rt_ifp->if_type;
1646 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index =
1647 rt->rt_ifp->if_index;
1648 }
1649 RADIX_NODE_HEAD_UNLOCK(rnh);
1650 nd6_rtmsg(RTM_ADD, rt);
1651 RT_UNLOCK(rt);
1652 }
1653 pr->ndpr_stateflags |= NDPRF_ONLINK;
1654 } else {
1655 char ip6bufg[INET6_ADDRSTRLEN], ip6bufm[INET6_ADDRSTRLEN];
1656 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a"
1657 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
1658 "errno = %d\n",
1659 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1660 pr->ndpr_plen, if_name(ifp),
1661 ip6_sprintf(ip6bufg, &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
1662 ip6_sprintf(ip6bufm, &mask6.sin6_addr), rtflags, error));
1663 }
1664
1665 if (rt != NULL) {
1666 RT_LOCK(rt);
1667 RT_REMREF(rt);
1668 RT_UNLOCK(rt);
1669 }
1670 if (ifa != NULL)
1671 ifa_free(ifa);
1672
1673 return (error);
1674}
1675
1676int
1677nd6_prefix_offlink(struct nd_prefix *pr)
1678{
1679 int error = 0;
1680 struct ifnet *ifp = pr->ndpr_ifp;
1681 struct nd_prefix *opr;
1682 struct sockaddr_in6 sa6, mask6;
1683 struct rtentry *rt = NULL;
1684 char ip6buf[INET6_ADDRSTRLEN];
1685
1686 /* sanity check */
1687 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1688 nd6log((LOG_ERR,
1689 "nd6_prefix_offlink: %s/%d is already off-link\n",
1690 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1691 pr->ndpr_plen));
1692 return (EEXIST);
1693 }
1694
1695 bzero(&sa6, sizeof(sa6));
1696 sa6.sin6_family = AF_INET6;
1697 sa6.sin6_len = sizeof(sa6);
1698 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
1699 sizeof(struct in6_addr));
1700 bzero(&mask6, sizeof(mask6));
1701 mask6.sin6_family = AF_INET6;
1702 mask6.sin6_len = sizeof(sa6);
1703 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
1704 error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
1705 (struct sockaddr *)&mask6, 0, &rt);
1706 if (error == 0) {
1707 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
1708
1709 /* report the route deletion to the routing socket. */
1710 if (rt != NULL)
1711 nd6_rtmsg(RTM_DELETE, rt);
1712
1713 /*
1714 * There might be the same prefix on another interface,
1715 * the prefix which could not be on-link just because we have
1716 * the interface route (see comments in nd6_prefix_onlink).
1717 * If there's one, try to make the prefix on-link on the
1718 * interface.
1719 */
1720 for (opr = V_nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1721 if (opr == pr)
1722 continue;
1723
1724 if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
1725 continue;
1726
1727 /*
1728 * KAME specific: detached prefixes should not be
1729 * on-link.
1730 */
1731 if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1732 continue;
1733
1734 if (opr->ndpr_plen == pr->ndpr_plen &&
1735 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1736 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
1737 int e;
1738
1739 if ((e = nd6_prefix_onlink(opr)) != 0) {
1740 nd6log((LOG_ERR,
1741 "nd6_prefix_offlink: failed to "
1742 "recover a prefix %s/%d from %s "
1743 "to %s (errno = %d)\n",
1744 ip6_sprintf(ip6buf,
1745 &opr->ndpr_prefix.sin6_addr),
1746 opr->ndpr_plen, if_name(ifp),
1747 if_name(opr->ndpr_ifp), e));
1748 }
1749 }
1750 }
1751 } else {
1752 /* XXX: can we still set the NDPRF_ONLINK flag? */
1753 nd6log((LOG_ERR,
1754 "nd6_prefix_offlink: failed to delete route: "
1755 "%s/%d on %s (errno = %d)\n",
1756 ip6_sprintf(ip6buf, &sa6.sin6_addr), pr->ndpr_plen,
1757 if_name(ifp), error));
1758 }
1759
1760 if (rt != NULL) {
1761 RTFREE(rt);
1762 }
1763
1764 return (error);
1765}
1766
1767static struct in6_ifaddr *
1768in6_ifadd(struct nd_prefixctl *pr, int mcast)
1769{
1770 struct ifnet *ifp = pr->ndpr_ifp;
1771 struct ifaddr *ifa;
1772 struct in6_aliasreq ifra;
1773 struct in6_ifaddr *ia, *ib;
1774 int error, plen0;
1775 struct in6_addr mask;
1776 int prefixlen = pr->ndpr_plen;
1777 int updateflags;
1778 char ip6buf[INET6_ADDRSTRLEN];
1779
1780 in6_prefixlen2mask(&mask, prefixlen);
1781
1782 /*
1783 * find a link-local address (will be interface ID).
1784 * Is it really mandatory? Theoretically, a global or a site-local
1785 * address can be configured without a link-local address, if we
1786 * have a unique interface identifier...
1787 *
1788 * it is not mandatory to have a link-local address, we can generate
1789 * interface identifier on the fly. we do this because:
1790 * (1) it should be the easiest way to find interface identifier.
1791 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1792 * for multiple addresses on a single interface, and possible shortcut
1793 * of DAD. we omitted DAD for this reason in the past.
1794 * (3) a user can prevent autoconfiguration of global address
1795 * by removing link-local address by hand (this is partly because we
1796 * don't have other way to control the use of IPv6 on an interface.
1797 * this has been our design choice - cf. NRL's "ifconfig auto").
1798 * (4) it is easier to manage when an interface has addresses
1799 * with the same interface identifier, than to have multiple addresses
1800 * with different interface identifiers.
1801 */
1802 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
1803 if (ifa)
1804 ib = (struct in6_ifaddr *)ifa;
1805 else
1806 return NULL;
1807
1808 /* prefixlen + ifidlen must be equal to 128 */
1809 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
1810 if (prefixlen != plen0) {
1811 ifa_free(ifa);
1812 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
1813 "(prefix=%d ifid=%d)\n",
1814 if_name(ifp), prefixlen, 128 - plen0));
1815 return NULL;
1816 }
1817
1818 /* make ifaddr */
1819
1820 bzero(&ifra, sizeof(ifra));
1821 /*
1822 * in6_update_ifa() does not use ifra_name, but we accurately set it
1823 * for safety.
1824 */
1825 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1826 ifra.ifra_addr.sin6_family = AF_INET6;
1827 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
1828 /* prefix */
1829 ifra.ifra_addr.sin6_addr = pr->ndpr_prefix.sin6_addr;
1830 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
1831 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
1832 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
1833 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
1834
1835 /* interface ID */
1836 ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
1837 (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
1838 ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
1839 (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
1840 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
1841 (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
1842 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
1843 (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
1844 ifa_free(ifa);
1845
1846 /* new prefix mask. */
1847 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1848 ifra.ifra_prefixmask.sin6_family = AF_INET6;
1849 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
1850 sizeof(ifra.ifra_prefixmask.sin6_addr));
1851
1852 /* lifetimes. */
1853 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
1854 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
1855
1856 /* XXX: scope zone ID? */
1857
1858 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
1859
1860 /*
1861 * Make sure that we do not have this address already. This should
1862 * usually not happen, but we can still see this case, e.g., if we
1863 * have manually configured the exact address to be configured.
1864 */
1865 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
1866 &ifra.ifra_addr.sin6_addr);
1867 if (ifa != NULL) {
1868 ifa_free(ifa);
1869 /* this should be rare enough to make an explicit log */
1870 log(LOG_INFO, "in6_ifadd: %s is already configured\n",
1871 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr));
1872 return (NULL);
1873 }
1874
1875 /*
1876 * Allocate ifaddr structure, link into chain, etc.
1877 * If we are going to create a new address upon receiving a multicasted
1878 * RA, we need to impose a random delay before starting DAD.
1879 * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2]
1880 */
1881 updateflags = 0;
1882 if (mcast)
1883 updateflags |= IN6_IFAUPDATE_DADDELAY;
1884 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) {
1885 nd6log((LOG_ERR,
1886 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
1887 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr),
1888 if_name(ifp), error));
1889 return (NULL); /* ifaddr must not have been allocated. */
1890 }
1891
1892 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1893 /*
1894 * XXXRW: Assumption of non-NULLness here might not be true with
1895 * fine-grained locking -- should we validate it? Or just return
1896 * earlier ifa rather than looking it up again?
1897 */
1898 return (ia); /* this is always non-NULL and referenced. */
1899}
1900
1901/*
1902 * ia0 - corresponding public address
1903 */
1904int
1905in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay)
1906{
1907 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
1908 struct in6_ifaddr *newia, *ia;
1909 struct in6_aliasreq ifra;
1910 int i, error;
1911 int trylimit = 3; /* XXX: adhoc value */
1912 int updateflags;
1913 u_int32_t randid[2];
1914 time_t vltime0, pltime0;
1915
1916 bzero(&ifra, sizeof(ifra));
1917 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1918 ifra.ifra_addr = ia0->ia_addr;
1919 /* copy prefix mask */
1920 ifra.ifra_prefixmask = ia0->ia_prefixmask;
1921 /* clear the old IFID */
1922 for (i = 0; i < 4; i++) {
1923 ifra.ifra_addr.sin6_addr.s6_addr32[i] &=
1924 ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
1925 }
1926
1927 again:
1928 if (in6_get_tmpifid(ifp, (u_int8_t *)randid,
1929 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) {
1930 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find a good "
1931 "random IFID\n"));
1932 return (EINVAL);
1933 }
1934 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
1935 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
1936 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
1937 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
1938
1939 /*
1940 * in6_get_tmpifid() quite likely provided a unique interface ID.
1941 * However, we may still have a chance to see collision, because
1942 * there may be a time lag between generation of the ID and generation
1943 * of the address. So, we'll do one more sanity check.
1944 */
1945 IN6_IFADDR_RLOCK();
1946 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
1947 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
1948 &ifra.ifra_addr.sin6_addr)) {
1949 if (trylimit-- == 0) {
1950 IN6_IFADDR_RUNLOCK();
1951 /*
1952 * Give up. Something strange should have
1953 * happened.
1954 */
1955 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to "
1956 "find a unique random IFID\n"));
1957 return (EEXIST);
1958 }
1959 IN6_IFADDR_RUNLOCK();
1960 forcegen = 1;
1961 goto again;
1962 }
1963 }
1964 IN6_IFADDR_RUNLOCK();
1965
1966 /*
1967 * The Valid Lifetime is the lower of the Valid Lifetime of the
1968 * public address or TEMP_VALID_LIFETIME.
1969 * The Preferred Lifetime is the lower of the Preferred Lifetime
1970 * of the public address or TEMP_PREFERRED_LIFETIME -
1971 * DESYNC_FACTOR.
1972 */
1973 if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1974 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
1975 (ia0->ia6_lifetime.ia6t_vltime -
1976 (time_second - ia0->ia6_updatetime));
1977 if (vltime0 > V_ip6_temp_valid_lifetime)
1978 vltime0 = V_ip6_temp_valid_lifetime;
1979 } else
1980 vltime0 = V_ip6_temp_valid_lifetime;
1981 if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1982 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
1983 (ia0->ia6_lifetime.ia6t_pltime -
1984 (time_second - ia0->ia6_updatetime));
1985 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){
1986 pltime0 = V_ip6_temp_preferred_lifetime -
1987 V_ip6_desync_factor;
1988 }
1989 } else
1990 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor;
1991 ifra.ifra_lifetime.ia6t_vltime = vltime0;
1992 ifra.ifra_lifetime.ia6t_pltime = pltime0;
1993
1994 /*
1995 * A temporary address is created only if this calculated Preferred
1996 * Lifetime is greater than REGEN_ADVANCE time units.
1997 */
1998 if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance)
1999 return (0);
2000
2001 /* XXX: scope zone ID? */
2002
2003 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
2004
2005 /* allocate ifaddr structure, link into chain, etc. */
2006 updateflags = 0;
2007 if (delay)
2008 updateflags |= IN6_IFAUPDATE_DADDELAY;
2009 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0)
2010 return (error);
2011
2012 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
2013 if (newia == NULL) { /* XXX: can it happen? */
2014 nd6log((LOG_ERR,
2015 "in6_tmpifadd: ifa update succeeded, but we got "
2016 "no ifaddr\n"));
2017 return (EINVAL); /* XXX */
2018 }
2019 newia->ia6_ndpr = ia0->ia6_ndpr;
2020 newia->ia6_ndpr->ndpr_refcnt++;
2021 ifa_free(&newia->ia_ifa);
2022
2023 /*
2024 * A newly added address might affect the status of other addresses.
2025 * XXX: when the temporary address is generated with a new public
2026 * address, the onlink check is redundant. However, it would be safe
2027 * to do the check explicitly everywhere a new address is generated,
2028 * and, in fact, we surely need the check when we create a new
2029 * temporary address due to deprecation of an old temporary address.
2030 */
2031 pfxlist_onlink_check();
2032
2033 return (0);
2034}
2035
2036static int
2037in6_init_prefix_ltimes(struct nd_prefix *ndpr)
2038{
2039 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
2040 ndpr->ndpr_preferred = 0;
2041 else
2042 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime;
2043 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
2044 ndpr->ndpr_expire = 0;
2045 else
2046 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime;
2047
2048 return 0;
2049}
2050
2051static void
2052in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
2053{
2054 /* init ia6t_expire */
2055 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
2056 lt6->ia6t_expire = 0;
2057 else {
2058 lt6->ia6t_expire = time_second;
2059 lt6->ia6t_expire += lt6->ia6t_vltime;
2060 }
2061
2062 /* init ia6t_preferred */
2063 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
2064 lt6->ia6t_preferred = 0;
2065 else {
2066 lt6->ia6t_preferred = time_second;
2067 lt6->ia6t_preferred += lt6->ia6t_pltime;
2068 }
2069}
2070
2071/*
2072 * Delete all the routing table entries that use the specified gateway.
2073 * XXX: this function causes search through all entries of routing table, so
2074 * it shouldn't be called when acting as a router.
2075 */
2076void
2077rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
2078{
2079 struct radix_node_head *rnh;
2080 int s = splnet();
2081
2082 /* We'll care only link-local addresses */
2083 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) {
2084 splx(s);
2085 return;
2086 }
2087
2088 rnh = rt_tables_get_rnh(0, AF_INET6);
2089 if (rnh == NULL)
2090 return;
2091
2092 RADIX_NODE_HEAD_LOCK(rnh);
2093 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
2094 RADIX_NODE_HEAD_UNLOCK(rnh);
2095 splx(s);
2096}
2097
2098static int
2099rt6_deleteroute(struct radix_node *rn, void *arg)
2100{
2101#define SIN6(s) ((struct sockaddr_in6 *)s)
2102 struct rtentry *rt = (struct rtentry *)rn;
2103 struct in6_addr *gate = (struct in6_addr *)arg;
2104
2105 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
2106 return (0);
2107
2108 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) {
2109 return (0);
2110 }
2111
2112 /*
2113 * Do not delete a static route.
2114 * XXX: this seems to be a bit ad-hoc. Should we consider the
2115 * 'cloned' bit instead?
2116 */
2117 if ((rt->rt_flags & RTF_STATIC) != 0)
2118 return (0);
2119
2120 /*
2121 * We delete only host route. This means, in particular, we don't
2122 * delete default route.
2123 */
2124 if ((rt->rt_flags & RTF_HOST) == 0)
2125 return (0);
2126
2127 return (rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
2128 rt_mask(rt), rt->rt_flags, 0));
2129#undef SIN6
2130}
2131
2132int
2133nd6_setdefaultiface(int ifindex)
2134{
2135 int error = 0;
2136
2137 if (ifindex < 0 || V_if_index < ifindex)
2138 return (EINVAL);
2139 if (ifindex != 0 && !ifnet_byindex(ifindex))
2140 return (EINVAL);
2141
2142 if (V_nd6_defifindex != ifindex) {
2143 V_nd6_defifindex = ifindex;
2144 if (V_nd6_defifindex > 0)
2145 V_nd6_defifp = ifnet_byindex(V_nd6_defifindex);
2146 else
2147 V_nd6_defifp = NULL;
2148
2149 /*
2150 * Our current implementation assumes one-to-one maping between
2151 * interfaces and links, so it would be natural to use the
2152 * default interface as the default link.
2153 */
2154 scope6_setdefault(V_nd6_defifp);
2155 }
2156
2157 return (error);
2158}
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