1 /* $FreeBSD: releng/5.4/sys/netinet6/nd6_rtr.c 141090 2005-01-31 23:27:04Z imp $ */
2 /* $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $ */
3
4 /*-
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include "opt_inet.h"
34 #include "opt_inet6.h"
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/malloc.h>
39 #include <sys/mbuf.h>
40 #include <sys/socket.h>
41 #include <sys/sockio.h>
42 #include <sys/time.h>
43 #include <sys/kernel.h>
44 #include <sys/errno.h>
45 #include <sys/syslog.h>
46 #include <sys/queue.h>
47
48 #include <net/if.h>
49 #include <net/if_types.h>
50 #include <net/if_dl.h>
51 #include <net/route.h>
52 #include <net/radix.h>
53
54 #include <netinet/in.h>
55 #include <netinet6/in6_var.h>
56 #include <netinet6/in6_ifattach.h>
57 #include <netinet/ip6.h>
58 #include <netinet6/ip6_var.h>
59 #include <netinet6/nd6.h>
60 #include <netinet/icmp6.h>
61 #include <netinet6/scope6_var.h>
62
63 #include <net/net_osdep.h>
64
65 #define SDL(s) ((struct sockaddr_dl *)s)
66
67 static struct nd_defrouter *defrtrlist_update __P((struct nd_defrouter *));
68 static struct in6_ifaddr *in6_ifadd __P((struct nd_prefix *,
69 struct in6_addr *));
70 static struct nd_pfxrouter *pfxrtr_lookup __P((struct nd_prefix *,
71 struct nd_defrouter *));
72 static void pfxrtr_add __P((struct nd_prefix *, struct nd_defrouter *));
73 static void pfxrtr_del __P((struct nd_pfxrouter *));
74 static struct nd_pfxrouter *find_pfxlist_reachable_router
75 __P((struct nd_prefix *));
76 static void defrouter_addifreq __P((struct ifnet *));
77 static void nd6_rtmsg __P((int, struct rtentry *));
78
79 static void in6_init_address_ltimes __P((struct nd_prefix *,
80 struct in6_addrlifetime *));
81
82 static int rt6_deleteroute __P((struct radix_node *, void *));
83
84 extern int nd6_recalc_reachtm_interval;
85
86 static struct ifnet *nd6_defifp;
87 int nd6_defifindex;
88
89 int ip6_use_tempaddr = 0;
90
91 int ip6_desync_factor;
92 u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME;
93 u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME;
94 /*
95 * shorter lifetimes for debugging purposes.
96 int ip6_temp_preferred_lifetime = 800;
97 static int ip6_temp_valid_lifetime = 1800;
98 */
99 int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE;
100
101 /*
102 * Receive Router Solicitation Message - just for routers.
103 * Router solicitation/advertisement is mostly managed by userland program
104 * (rtadvd) so here we have no function like nd6_ra_output().
105 *
106 * Based on RFC 2461
107 */
108 void
109 nd6_rs_input(m, off, icmp6len)
110 struct mbuf *m;
111 int off, icmp6len;
112 {
113 struct ifnet *ifp = m->m_pkthdr.rcvif;
114 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
115 struct nd_router_solicit *nd_rs;
116 struct in6_addr saddr6 = ip6->ip6_src;
117 char *lladdr = NULL;
118 int lladdrlen = 0;
119 #if 0
120 struct sockaddr_dl *sdl = (struct sockaddr_dl *)NULL;
121 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL;
122 struct rtentry *rt = NULL;
123 int is_newentry;
124 #endif
125 union nd_opts ndopts;
126
127 /* If I'm not a router, ignore it. */
128 if (ip6_accept_rtadv != 0 || ip6_forwarding != 1)
129 goto freeit;
130
131 /* Sanity checks */
132 if (ip6->ip6_hlim != 255) {
133 nd6log((LOG_ERR,
134 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
135 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
136 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
137 goto bad;
138 }
139
140 /*
141 * Don't update the neighbor cache, if src = ::.
142 * This indicates that the src has no IP address assigned yet.
143 */
144 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
145 goto freeit;
146
147 #ifndef PULLDOWN_TEST
148 IP6_EXTHDR_CHECK(m, off, icmp6len,);
149 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
150 #else
151 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
152 if (nd_rs == NULL) {
153 icmp6stat.icp6s_tooshort++;
154 return;
155 }
156 #endif
157
158 icmp6len -= sizeof(*nd_rs);
159 nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
160 if (nd6_options(&ndopts) < 0) {
161 nd6log((LOG_INFO,
162 "nd6_rs_input: invalid ND option, ignored\n"));
163 /* nd6_options have incremented stats */
164 goto freeit;
165 }
166
167 if (ndopts.nd_opts_src_lladdr) {
168 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
169 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
170 }
171
172 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
173 nd6log((LOG_INFO,
174 "nd6_rs_input: lladdrlen mismatch for %s "
175 "(if %d, RS packet %d)\n",
176 ip6_sprintf(&saddr6),
177 ifp->if_addrlen, lladdrlen - 2));
178 goto bad;
179 }
180
181 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
182
183 freeit:
184 m_freem(m);
185 return;
186
187 bad:
188 icmp6stat.icp6s_badrs++;
189 m_freem(m);
190 }
191
192 /*
193 * Receive Router Advertisement Message.
194 *
195 * Based on RFC 2461
196 * TODO: on-link bit on prefix information
197 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
198 */
199 void
200 nd6_ra_input(m, off, icmp6len)
201 struct mbuf *m;
202 int off, icmp6len;
203 {
204 struct ifnet *ifp = m->m_pkthdr.rcvif;
205 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
206 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
207 struct nd_router_advert *nd_ra;
208 struct in6_addr saddr6 = ip6->ip6_src;
209 #if 0
210 struct in6_addr daddr6 = ip6->ip6_dst;
211 int flags; /* = nd_ra->nd_ra_flags_reserved; */
212 int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0);
213 int is_other = ((flags & ND_RA_FLAG_OTHER) != 0);
214 #endif
215 union nd_opts ndopts;
216 struct nd_defrouter *dr;
217
218 /*
219 * We only accept RAs only when
220 * the system-wide variable allows the acceptance, and
221 * per-interface variable allows RAs on the receiving interface.
222 */
223 if (ip6_accept_rtadv == 0)
224 goto freeit;
225 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
226 goto freeit;
227
228 if (ip6->ip6_hlim != 255) {
229 nd6log((LOG_ERR,
230 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
231 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
232 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
233 goto bad;
234 }
235
236 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
237 nd6log((LOG_ERR,
238 "nd6_ra_input: src %s is not link-local\n",
239 ip6_sprintf(&saddr6)));
240 goto bad;
241 }
242
243 #ifndef PULLDOWN_TEST
244 IP6_EXTHDR_CHECK(m, off, icmp6len,);
245 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
246 #else
247 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
248 if (nd_ra == NULL) {
249 icmp6stat.icp6s_tooshort++;
250 return;
251 }
252 #endif
253
254 icmp6len -= sizeof(*nd_ra);
255 nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
256 if (nd6_options(&ndopts) < 0) {
257 nd6log((LOG_INFO,
258 "nd6_ra_input: invalid ND option, ignored\n"));
259 /* nd6_options have incremented stats */
260 goto freeit;
261 }
262
263 {
264 struct nd_defrouter dr0;
265 u_int32_t advreachable = nd_ra->nd_ra_reachable;
266
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 = 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_prefix 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(&pi->nd_opt_pi_prefix)));
327 continue;
328 }
329
330 /* aggregatable unicast address, rfc2374 */
331 if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20
332 && pi->nd_opt_pi_prefix_len != 64) {
333 nd6log((LOG_INFO,
334 "nd6_ra_input: invalid prefixlen "
335 "%d for rfc2374 prefix %s, ignored\n",
336 pi->nd_opt_pi_prefix_len,
337 ip6_sprintf(&pi->nd_opt_pi_prefix)));
338 continue;
339 }
340
341 bzero(&pr, sizeof(pr));
342 pr.ndpr_prefix.sin6_family = AF_INET6;
343 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
344 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
345 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
346
347 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
348 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
349 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
350 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
351 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
352 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
353 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
354 if (in6_init_prefix_ltimes(&pr))
355 continue; /* prefix lifetime init failed */
356 (void)prelist_update(&pr, dr, m);
357 }
358 }
359
360 /*
361 * MTU
362 */
363 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
364 u_long mtu;
365 u_long maxmtu;
366
367 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
368
369 /* lower bound */
370 if (mtu < IPV6_MMTU) {
371 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
372 "mtu=%lu sent from %s, ignoring\n",
373 mtu, ip6_sprintf(&ip6->ip6_src)));
374 goto skip;
375 }
376
377 /* upper bound */
378 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
379 ? ndi->maxmtu : ifp->if_mtu;
380 if (mtu <= maxmtu) {
381 int change = (ndi->linkmtu != mtu);
382
383 ndi->linkmtu = mtu;
384 if (change) /* in6_maxmtu may change */
385 in6_setmaxmtu();
386 } else {
387 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
388 "mtu=%lu sent from %s; "
389 "exceeds maxmtu %lu, ignoring\n",
390 mtu, ip6_sprintf(&ip6->ip6_src), maxmtu));
391 }
392 }
393
394 skip:
395
396 /*
397 * Source link layer address
398 */
399 {
400 char *lladdr = NULL;
401 int lladdrlen = 0;
402
403 if (ndopts.nd_opts_src_lladdr) {
404 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
405 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
406 }
407
408 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
409 nd6log((LOG_INFO,
410 "nd6_ra_input: lladdrlen mismatch for %s "
411 "(if %d, RA packet %d)\n", ip6_sprintf(&saddr6),
412 ifp->if_addrlen, lladdrlen - 2));
413 goto bad;
414 }
415
416 nd6_cache_lladdr(ifp, &saddr6, lladdr,
417 lladdrlen, ND_ROUTER_ADVERT, 0);
418
419 /*
420 * Installing a link-layer address might change the state of the
421 * router's neighbor cache, which might also affect our on-link
422 * detection of adveritsed prefixes.
423 */
424 pfxlist_onlink_check();
425 }
426
427 freeit:
428 m_freem(m);
429 return;
430
431 bad:
432 icmp6stat.icp6s_badra++;
433 m_freem(m);
434 }
435
436 /*
437 * default router list proccessing sub routines
438 */
439
440 /* tell the change to user processes watching the routing socket. */
441 static void
442 nd6_rtmsg(cmd, rt)
443 int cmd;
444 struct rtentry *rt;
445 {
446 struct rt_addrinfo info;
447
448 bzero((caddr_t)&info, sizeof(info));
449 info.rti_info[RTAX_DST] = rt_key(rt);
450 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
451 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
452 info.rti_info[RTAX_IFP] =
453 (struct sockaddr *)TAILQ_FIRST(&rt->rt_ifp->if_addrlist);
454 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
455
456 rt_missmsg(cmd, &info, rt->rt_flags, 0);
457 }
458
459 void
460 defrouter_addreq(new)
461 struct nd_defrouter *new;
462 {
463 struct sockaddr_in6 def, mask, gate;
464 struct rtentry *newrt = NULL;
465
466 bzero(&def, sizeof(def));
467 bzero(&mask, sizeof(mask));
468 bzero(&gate, sizeof(gate));
469
470 def.sin6_len = mask.sin6_len = gate.sin6_len =
471 sizeof(struct sockaddr_in6);
472 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
473 gate.sin6_addr = new->rtaddr;
474
475 (void)rtrequest(RTM_ADD, (struct sockaddr *)&def,
476 (struct sockaddr *)&gate, (struct sockaddr *)&mask,
477 RTF_GATEWAY, &newrt);
478 if (newrt) {
479 RT_LOCK(newrt);
480 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
481 RT_REMREF(newrt);
482 RT_UNLOCK(newrt);
483 }
484 return;
485 }
486
487 /* Add a route to a given interface as default */
488 void
489 defrouter_addifreq(ifp)
490 struct ifnet *ifp;
491 {
492 struct sockaddr_in6 def, mask;
493 struct ifaddr *ifa;
494 struct rtentry *newrt = NULL;
495 int error, flags;
496
497 bzero(&def, sizeof(def));
498 bzero(&mask, sizeof(mask));
499
500 def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6);
501 def.sin6_family = mask.sin6_family = AF_INET6;
502
503 /*
504 * Search for an ifaddr beloging to the specified interface.
505 * XXX: An IPv6 address are required to be assigned on the interface.
506 */
507 if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) {
508 nd6log((LOG_ERR, /* better error? */
509 "defrouter_addifreq: failed to find an ifaddr "
510 "to install a route to interface %s\n",
511 if_name(ifp)));
512 return;
513 }
514
515 flags = ifa->ifa_flags;
516 error = rtrequest(RTM_ADD, (struct sockaddr *)&def, ifa->ifa_addr,
517 (struct sockaddr *)&mask, flags, &newrt);
518 if (error != 0) {
519 nd6log((LOG_ERR,
520 "defrouter_addifreq: failed to install a route to "
521 "interface %s (errno = %d)\n",
522 if_name(ifp), error));
523 } else {
524 if (newrt) {
525 RT_LOCK(newrt);
526 nd6_rtmsg(RTM_ADD, newrt);
527 RT_REMREF(newrt);
528 RT_UNLOCK(newrt);
529 }
530 }
531 }
532
533 struct nd_defrouter *
534 defrouter_lookup(addr, ifp)
535 struct in6_addr *addr;
536 struct ifnet *ifp;
537 {
538 struct nd_defrouter *dr;
539
540 for (dr = TAILQ_FIRST(&nd_defrouter); dr;
541 dr = TAILQ_NEXT(dr, dr_entry)) {
542 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
543 return (dr);
544 }
545
546 return (NULL); /* search failed */
547 }
548
549 void
550 defrouter_delreq(dr, dofree)
551 struct nd_defrouter *dr;
552 int dofree;
553 {
554 struct sockaddr_in6 def, mask, gate;
555 struct rtentry *oldrt = NULL;
556
557 bzero(&def, sizeof(def));
558 bzero(&mask, sizeof(mask));
559 bzero(&gate, sizeof(gate));
560
561 def.sin6_len = mask.sin6_len = gate.sin6_len =
562 sizeof(struct sockaddr_in6);
563 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
564 gate.sin6_addr = dr->rtaddr;
565
566 rtrequest(RTM_DELETE, (struct sockaddr *)&def,
567 (struct sockaddr *)&gate,
568 (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt);
569 if (oldrt) {
570 nd6_rtmsg(RTM_DELETE, oldrt);
571 RTFREE(oldrt);
572 }
573
574 if (dofree) /* XXX: necessary? */
575 free(dr, M_IP6NDP);
576 }
577
578 void
579 defrtrlist_del(dr)
580 struct nd_defrouter *dr;
581 {
582 struct nd_defrouter *deldr = NULL;
583 struct nd_prefix *pr;
584
585 /*
586 * Flush all the routing table entries that use the router
587 * as a next hop.
588 */
589 if (!ip6_forwarding && ip6_accept_rtadv) /* XXX: better condition? */
590 rt6_flush(&dr->rtaddr, dr->ifp);
591
592 if (dr == TAILQ_FIRST(&nd_defrouter))
593 deldr = dr; /* The router is primary. */
594
595 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
596
597 /*
598 * Also delete all the pointers to the router in each prefix lists.
599 */
600 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
601 struct nd_pfxrouter *pfxrtr;
602 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
603 pfxrtr_del(pfxrtr);
604 }
605 pfxlist_onlink_check();
606
607 /*
608 * If the router is the primary one, choose a new one.
609 * Note that defrouter_select() will remove the current gateway
610 * from the routing table.
611 */
612 if (deldr)
613 defrouter_select();
614
615 free(dr, M_IP6NDP);
616 }
617
618 /*
619 * Default Router Selection according to Section 6.3.6 of RFC 2461:
620 * 1) Routers that are reachable or probably reachable should be
621 * preferred.
622 * 2) When no routers on the list are known to be reachable or
623 * probably reachable, routers SHOULD be selected in a round-robin
624 * fashion.
625 * 3) If the Default Router List is empty, assume that all
626 * destinations are on-link.
627 */
628 void
629 defrouter_select()
630 {
631 int s = splnet();
632 struct nd_defrouter *dr, anydr;
633 struct rtentry *rt = NULL;
634 struct llinfo_nd6 *ln = NULL;
635
636 /*
637 * Search for a (probably) reachable router from the list.
638 */
639 for (dr = TAILQ_FIRST(&nd_defrouter); dr;
640 dr = TAILQ_NEXT(dr, dr_entry)) {
641 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
642 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
643 ND6_IS_LLINFO_PROBREACH(ln)) {
644 /* Got it, and move it to the head */
645 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
646 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry);
647 break;
648 }
649 }
650
651 if ((dr = TAILQ_FIRST(&nd_defrouter))) {
652 /*
653 * De-install the previous default gateway and install
654 * a new one.
655 * Note that if there is no reachable router in the list,
656 * the head entry will be used anyway.
657 * XXX: do we have to check the current routing table entry?
658 */
659 bzero(&anydr, sizeof(anydr));
660 defrouter_delreq(&anydr, 0);
661 defrouter_addreq(dr);
662 }
663 else {
664 /*
665 * The Default Router List is empty, so install the default
666 * route to an inteface.
667 * XXX: The specification does not say this mechanism should
668 * be restricted to hosts, but this would be not useful
669 * (even harmful) for routers.
670 */
671 if (!ip6_forwarding) {
672 /*
673 * De-install the current default route
674 * in advance.
675 */
676 bzero(&anydr, sizeof(anydr));
677 defrouter_delreq(&anydr, 0);
678 if (nd6_defifp) {
679 /*
680 * Install a route to the default interface
681 * as default route.
682 * XXX: we enable this for host only, because
683 * this may override a default route installed
684 * a user process (e.g. routing daemon) in a
685 * router case.
686 */
687 defrouter_addifreq(nd6_defifp);
688 } else {
689 nd6log((LOG_INFO, "defrouter_select: "
690 "there's no default router and no default"
691 " interface\n"));
692 }
693 }
694 }
695
696 splx(s);
697 return;
698 }
699
700 static struct nd_defrouter *
701 defrtrlist_update(new)
702 struct nd_defrouter *new;
703 {
704 struct nd_defrouter *dr, *n;
705 int s = splnet();
706
707 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
708 /* entry exists */
709 if (new->rtlifetime == 0) {
710 defrtrlist_del(dr);
711 dr = NULL;
712 } else {
713 /* override */
714 dr->flags = new->flags; /* xxx flag check */
715 dr->rtlifetime = new->rtlifetime;
716 dr->expire = new->expire;
717 }
718 splx(s);
719 return (dr);
720 }
721
722 /* entry does not exist */
723 if (new->rtlifetime == 0) {
724 splx(s);
725 return (NULL);
726 }
727
728 n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
729 if (n == NULL) {
730 splx(s);
731 return (NULL);
732 }
733 bzero(n, sizeof(*n));
734 *n = *new;
735
736 /*
737 * Insert the new router at the end of the Default Router List.
738 * If there is no other router, install it anyway. Otherwise,
739 * just continue to use the current default router.
740 */
741 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry);
742 if (TAILQ_FIRST(&nd_defrouter) == n)
743 defrouter_select();
744 splx(s);
745
746 return (n);
747 }
748
749 static struct nd_pfxrouter *
750 pfxrtr_lookup(pr, dr)
751 struct nd_prefix *pr;
752 struct nd_defrouter *dr;
753 {
754 struct nd_pfxrouter *search;
755
756 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
757 if (search->router == dr)
758 break;
759 }
760
761 return (search);
762 }
763
764 static void
765 pfxrtr_add(pr, dr)
766 struct nd_prefix *pr;
767 struct nd_defrouter *dr;
768 {
769 struct nd_pfxrouter *new;
770
771 new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
772 if (new == NULL)
773 return;
774 bzero(new, sizeof(*new));
775 new->router = dr;
776
777 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
778
779 pfxlist_onlink_check();
780 }
781
782 static void
783 pfxrtr_del(pfr)
784 struct nd_pfxrouter *pfr;
785 {
786 LIST_REMOVE(pfr, pfr_entry);
787 free(pfr, M_IP6NDP);
788 }
789
790 struct nd_prefix *
791 nd6_prefix_lookup(pr)
792 struct nd_prefix *pr;
793 {
794 struct nd_prefix *search;
795
796 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) {
797 if (pr->ndpr_ifp == search->ndpr_ifp &&
798 pr->ndpr_plen == search->ndpr_plen &&
799 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
800 &search->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
801 break;
802 }
803 }
804
805 return (search);
806 }
807
808 int
809 nd6_prelist_add(pr, dr, newp)
810 struct nd_prefix *pr, **newp;
811 struct nd_defrouter *dr;
812 {
813 struct nd_prefix *new = NULL;
814 int i, s;
815
816 new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
817 if (new == NULL)
818 return(ENOMEM);
819 bzero(new, sizeof(*new));
820 *new = *pr;
821 if (newp != NULL)
822 *newp = new;
823
824 /* initialization */
825 LIST_INIT(&new->ndpr_advrtrs);
826 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
827 /* make prefix in the canonical form */
828 for (i = 0; i < 4; i++)
829 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
830 new->ndpr_mask.s6_addr32[i];
831
832 s = splnet();
833 /* link ndpr_entry to nd_prefix list */
834 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry);
835 splx(s);
836
837 /* ND_OPT_PI_FLAG_ONLINK processing */
838 if (new->ndpr_raf_onlink) {
839 int e;
840
841 if ((e = nd6_prefix_onlink(new)) != 0) {
842 nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
843 "the prefix %s/%d on-link on %s (errno=%d)\n",
844 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
845 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
846 /* proceed anyway. XXX: is it correct? */
847 }
848 }
849
850 if (dr)
851 pfxrtr_add(new, dr);
852
853 return 0;
854 }
855
856 void
857 prelist_remove(pr)
858 struct nd_prefix *pr;
859 {
860 struct nd_pfxrouter *pfr, *next;
861 int e, s;
862
863 /* make sure to invalidate the prefix until it is really freed. */
864 pr->ndpr_vltime = 0;
865 pr->ndpr_pltime = 0;
866 #if 0
867 /*
868 * Though these flags are now meaningless, we'd rather keep the value
869 * not to confuse users when executing "ndp -p".
870 */
871 pr->ndpr_raf_onlink = 0;
872 pr->ndpr_raf_auto = 0;
873 #endif
874 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
875 (e = nd6_prefix_offlink(pr)) != 0) {
876 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
877 "on %s, errno=%d\n",
878 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
879 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
880 /* what should we do? */
881 }
882
883 if (pr->ndpr_refcnt > 0)
884 return; /* notice here? */
885
886 s = splnet();
887
888 /* unlink ndpr_entry from nd_prefix list */
889 LIST_REMOVE(pr, ndpr_entry);
890
891 /* free list of routers that adversed the prefix */
892 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
893 next = pfr->pfr_next;
894
895 free(pfr, M_IP6NDP);
896 }
897 splx(s);
898
899 free(pr, M_IP6NDP);
900
901 pfxlist_onlink_check();
902 }
903
904 int
905 prelist_update(new, dr, m)
906 struct nd_prefix *new;
907 struct nd_defrouter *dr; /* may be NULL */
908 struct mbuf *m;
909 {
910 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
911 struct ifaddr *ifa;
912 struct ifnet *ifp = new->ndpr_ifp;
913 struct nd_prefix *pr;
914 int s = splnet();
915 int error = 0;
916 int newprefix = 0;
917 int auth;
918 struct in6_addrlifetime lt6_tmp;
919
920 auth = 0;
921 if (m) {
922 /*
923 * Authenticity for NA consists authentication for
924 * both IP header and IP datagrams, doesn't it ?
925 */
926 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
927 auth = ((m->m_flags & M_AUTHIPHDR) &&
928 (m->m_flags & M_AUTHIPDGM));
929 #endif
930 }
931
932 if ((pr = nd6_prefix_lookup(new)) != NULL) {
933 /*
934 * nd6_prefix_lookup() ensures that pr and new have the same
935 * prefix on a same interface.
936 */
937
938 /*
939 * Update prefix information. Note that the on-link (L) bit
940 * and the autonomous (A) bit should NOT be changed from 1
941 * to 0.
942 */
943 if (new->ndpr_raf_onlink == 1)
944 pr->ndpr_raf_onlink = 1;
945 if (new->ndpr_raf_auto == 1)
946 pr->ndpr_raf_auto = 1;
947 if (new->ndpr_raf_onlink) {
948 pr->ndpr_vltime = new->ndpr_vltime;
949 pr->ndpr_pltime = new->ndpr_pltime;
950 pr->ndpr_preferred = new->ndpr_preferred;
951 pr->ndpr_expire = new->ndpr_expire;
952 }
953
954 if (new->ndpr_raf_onlink &&
955 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
956 int e;
957
958 if ((e = nd6_prefix_onlink(pr)) != 0) {
959 nd6log((LOG_ERR,
960 "prelist_update: failed to make "
961 "the prefix %s/%d on-link on %s "
962 "(errno=%d)\n",
963 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
964 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
965 /* proceed anyway. XXX: is it correct? */
966 }
967 }
968
969 if (dr && pfxrtr_lookup(pr, dr) == NULL)
970 pfxrtr_add(pr, dr);
971 } else {
972 struct nd_prefix *newpr = NULL;
973
974 newprefix = 1;
975
976 if (new->ndpr_vltime == 0)
977 goto end;
978 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
979 goto end;
980
981 bzero(&new->ndpr_addr, sizeof(struct in6_addr));
982
983 error = nd6_prelist_add(new, dr, &newpr);
984 if (error != 0 || newpr == NULL) {
985 nd6log((LOG_NOTICE, "prelist_update: "
986 "nd6_prelist_add failed for %s/%d on %s "
987 "errno=%d, returnpr=%p\n",
988 ip6_sprintf(&new->ndpr_prefix.sin6_addr),
989 new->ndpr_plen, if_name(new->ndpr_ifp),
990 error, newpr));
991 goto end; /* we should just give up in this case. */
992 }
993
994 /*
995 * XXX: from the ND point of view, we can ignore a prefix
996 * with the on-link bit being zero. However, we need a
997 * prefix structure for references from autoconfigured
998 * addresses. Thus, we explicitly make sure that the prefix
999 * itself expires now.
1000 */
1001 if (newpr->ndpr_raf_onlink == 0) {
1002 newpr->ndpr_vltime = 0;
1003 newpr->ndpr_pltime = 0;
1004 in6_init_prefix_ltimes(newpr);
1005 }
1006
1007 pr = newpr;
1008 }
1009
1010 /*
1011 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1012 * Note that pr must be non NULL at this point.
1013 */
1014
1015 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1016 if (!new->ndpr_raf_auto)
1017 goto afteraddrconf;
1018
1019 /*
1020 * 5.5.3 (b). the link-local prefix should have been ignored in
1021 * nd6_ra_input.
1022 */
1023
1024 /*
1025 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
1026 * This should have been done in nd6_ra_input.
1027 */
1028
1029 /*
1030 * 5.5.3 (d). If the prefix advertised does not match the prefix of an
1031 * address already in the list, and the Valid Lifetime is not 0,
1032 * form an address. Note that even a manually configured address
1033 * should reject autoconfiguration of a new address.
1034 */
1035 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1036 struct in6_ifaddr *ifa6;
1037 int ifa_plen;
1038 u_int32_t storedlifetime;
1039
1040 if (ifa->ifa_addr->sa_family != AF_INET6)
1041 continue;
1042
1043 ifa6 = (struct in6_ifaddr *)ifa;
1044
1045 /*
1046 * Spec is not clear here, but I believe we should concentrate
1047 * on unicast (i.e. not anycast) addresses.
1048 * XXX: other ia6_flags? detached or duplicated?
1049 */
1050 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
1051 continue;
1052
1053 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL);
1054 if (ifa_plen != new->ndpr_plen ||
1055 !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr,
1056 &new->ndpr_prefix.sin6_addr, ifa_plen))
1057 continue;
1058
1059 if (ia6_match == NULL) /* remember the first one */
1060 ia6_match = ifa6;
1061
1062 if ((ifa6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1063 continue;
1064
1065 /*
1066 * An already autoconfigured address matched. Now that we
1067 * are sure there is at least one matched address, we can
1068 * proceed to 5.5.3. (e): update the lifetimes according to the
1069 * "two hours" rule and the privacy extension.
1070 */
1071 #define TWOHOUR (120*60)
1072 lt6_tmp = ifa6->ia6_lifetime;
1073
1074 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1075 storedlifetime = ND6_INFINITE_LIFETIME;
1076 else if (IFA6_IS_INVALID(ifa6))
1077 storedlifetime = 0;
1078 else
1079 storedlifetime = lt6_tmp.ia6t_expire - time_second;
1080
1081 /* when not updating, keep the current stored lifetime. */
1082 lt6_tmp.ia6t_vltime = storedlifetime;
1083
1084 if (TWOHOUR < new->ndpr_vltime ||
1085 storedlifetime < new->ndpr_vltime) {
1086 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1087 } else if (storedlifetime <= TWOHOUR
1088 #if 0
1089 /*
1090 * This condition is logically redundant, so we just
1091 * omit it.
1092 * See IPng 6712, 6717, and 6721.
1093 */
1094 && new->ndpr_vltime <= storedlifetime
1095 #endif
1096 ) {
1097 if (auth) {
1098 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1099 }
1100 } else {
1101 /*
1102 * new->ndpr_vltime <= TWOHOUR &&
1103 * TWOHOUR < storedlifetime
1104 */
1105 lt6_tmp.ia6t_vltime = TWOHOUR;
1106 }
1107
1108 /* The 2 hour rule is not imposed for preferred lifetime. */
1109 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1110
1111 in6_init_address_ltimes(pr, <6_tmp);
1112
1113 /*
1114 * When adjusting the lifetimes of an existing temporary
1115 * address, only lower the lifetimes.
1116 * RFC 3041 3.3. (1).
1117 * XXX: how should we modify ia6t_[pv]ltime?
1118 */
1119 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
1120 if (lt6_tmp.ia6t_expire == 0 || /* no expire */
1121 lt6_tmp.ia6t_expire >
1122 ifa6->ia6_lifetime.ia6t_expire) {
1123 lt6_tmp.ia6t_expire =
1124 ifa6->ia6_lifetime.ia6t_expire;
1125 }
1126 if (lt6_tmp.ia6t_preferred == 0 || /* no expire */
1127 lt6_tmp.ia6t_preferred >
1128 ifa6->ia6_lifetime.ia6t_preferred) {
1129 lt6_tmp.ia6t_preferred =
1130 ifa6->ia6_lifetime.ia6t_preferred;
1131 }
1132 }
1133
1134 ifa6->ia6_lifetime = lt6_tmp;
1135 }
1136 if (ia6_match == NULL && new->ndpr_vltime) {
1137 /*
1138 * No address matched and the valid lifetime is non-zero.
1139 * Create a new address.
1140 */
1141 if ((ia6 = in6_ifadd(new, NULL)) != NULL) {
1142 /*
1143 * note that we should use pr (not new) for reference.
1144 */
1145 pr->ndpr_refcnt++;
1146 ia6->ia6_ndpr = pr;
1147
1148 /*
1149 * RFC 3041 3.3 (2).
1150 * When a new public address is created as described
1151 * in RFC2462, also create a new temporary address.
1152 *
1153 * RFC 3041 3.5.
1154 * When an interface connects to a new link, a new
1155 * randomized interface identifier should be generated
1156 * immediately together with a new set of temporary
1157 * addresses. Thus, we specifiy 1 as the 2nd arg of
1158 * in6_tmpifadd().
1159 */
1160 if (ip6_use_tempaddr) {
1161 int e;
1162 if ((e = in6_tmpifadd(ia6, 1)) != 0) {
1163 nd6log((LOG_NOTICE, "prelist_update: "
1164 "failed to create a temporary "
1165 "address, errno=%d\n",
1166 e));
1167 }
1168 }
1169
1170 /*
1171 * A newly added address might affect the status
1172 * of other addresses, so we check and update it.
1173 * XXX: what if address duplication happens?
1174 */
1175 pfxlist_onlink_check();
1176 } else {
1177 /* just set an error. do not bark here. */
1178 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1179 }
1180 }
1181
1182 afteraddrconf:
1183
1184 end:
1185 splx(s);
1186 return error;
1187 }
1188
1189 /*
1190 * A supplement function used in the on-link detection below;
1191 * detect if a given prefix has a (probably) reachable advertising router.
1192 * XXX: lengthy function name...
1193 */
1194 static struct nd_pfxrouter *
1195 find_pfxlist_reachable_router(pr)
1196 struct nd_prefix *pr;
1197 {
1198 struct nd_pfxrouter *pfxrtr;
1199 struct rtentry *rt;
1200 struct llinfo_nd6 *ln;
1201
1202 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr;
1203 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
1204 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0,
1205 pfxrtr->router->ifp)) &&
1206 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
1207 ND6_IS_LLINFO_PROBREACH(ln))
1208 break; /* found */
1209 }
1210
1211 return (pfxrtr);
1212 }
1213
1214 /*
1215 * Check if each prefix in the prefix list has at least one available router
1216 * that advertised the prefix (a router is "available" if its neighbor cache
1217 * entry is reachable or probably reachable).
1218 * If the check fails, the prefix may be off-link, because, for example,
1219 * we have moved from the network but the lifetime of the prefix has not
1220 * expired yet. So we should not use the prefix if there is another prefix
1221 * that has an available router.
1222 * But, if there is no prefix that has an available router, we still regards
1223 * all the prefixes as on-link. This is because we can't tell if all the
1224 * routers are simply dead or if we really moved from the network and there
1225 * is no router around us.
1226 */
1227 void
1228 pfxlist_onlink_check()
1229 {
1230 struct nd_prefix *pr;
1231 struct in6_ifaddr *ifa;
1232
1233 /*
1234 * Check if there is a prefix that has a reachable advertising
1235 * router.
1236 */
1237 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1238 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1239 break;
1240 }
1241
1242 if (pr) {
1243 /*
1244 * There is at least one prefix that has a reachable router.
1245 * Detach prefixes which have no reachable advertising
1246 * router, and attach other prefixes.
1247 */
1248 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1249 /* XXX: a link-local prefix should never be detached */
1250 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1251 continue;
1252
1253 /*
1254 * we aren't interested in prefixes without the L bit
1255 * set.
1256 */
1257 if (pr->ndpr_raf_onlink == 0)
1258 continue;
1259
1260 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1261 find_pfxlist_reachable_router(pr) == NULL)
1262 pr->ndpr_stateflags |= NDPRF_DETACHED;
1263 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1264 find_pfxlist_reachable_router(pr) != 0)
1265 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1266 }
1267 } else {
1268 /* there is no prefix that has a reachable router */
1269 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1270 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1271 continue;
1272
1273 if (pr->ndpr_raf_onlink == 0)
1274 continue;
1275
1276 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1277 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1278 }
1279 }
1280
1281 /*
1282 * Remove each interface route associated with a (just) detached
1283 * prefix, and reinstall the interface route for a (just) attached
1284 * prefix. Note that all attempt of reinstallation does not
1285 * necessarily success, when a same prefix is shared among multiple
1286 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1287 * so we don't have to care about them.
1288 */
1289 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1290 int e;
1291
1292 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1293 continue;
1294
1295 if (pr->ndpr_raf_onlink == 0)
1296 continue;
1297
1298 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1299 (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1300 if ((e = nd6_prefix_offlink(pr)) != 0) {
1301 nd6log((LOG_ERR,
1302 "pfxlist_onlink_check: failed to "
1303 "make %s/%d offlink, errno=%d\n",
1304 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1305 pr->ndpr_plen, e));
1306 }
1307 }
1308 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1309 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 &&
1310 pr->ndpr_raf_onlink) {
1311 if ((e = nd6_prefix_onlink(pr)) != 0) {
1312 nd6log((LOG_ERR,
1313 "pfxlist_onlink_check: failed to "
1314 "make %s/%d offlink, errno=%d\n",
1315 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1316 pr->ndpr_plen, e));
1317 }
1318 }
1319 }
1320
1321 /*
1322 * Changes on the prefix status might affect address status as well.
1323 * Make sure that all addresses derived from an attached prefix are
1324 * attached, and that all addresses derived from a detached prefix are
1325 * detached. Note, however, that a manually configured address should
1326 * always be attached.
1327 * The precise detection logic is same as the one for prefixes.
1328 */
1329 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1330 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1331 continue;
1332
1333 if (ifa->ia6_ndpr == NULL) {
1334 /*
1335 * This can happen when we first configure the address
1336 * (i.e. the address exists, but the prefix does not).
1337 * XXX: complicated relationships...
1338 */
1339 continue;
1340 }
1341
1342 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1343 break;
1344 }
1345 if (ifa) {
1346 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1347 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1348 continue;
1349
1350 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1351 continue;
1352
1353 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1354 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1355 else
1356 ifa->ia6_flags |= IN6_IFF_DETACHED;
1357 }
1358 }
1359 else {
1360 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1361 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1362 continue;
1363
1364 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1365 }
1366 }
1367 }
1368
1369 int
1370 nd6_prefix_onlink(pr)
1371 struct nd_prefix *pr;
1372 {
1373 struct ifaddr *ifa;
1374 struct ifnet *ifp = pr->ndpr_ifp;
1375 struct sockaddr_in6 mask6;
1376 struct nd_prefix *opr;
1377 u_long rtflags;
1378 int error = 0;
1379 struct rtentry *rt = NULL;
1380
1381 /* sanity check */
1382 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1383 nd6log((LOG_ERR,
1384 "nd6_prefix_onlink: %s/%d is already on-link\n",
1385 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen);
1386 return (EEXIST));
1387 }
1388
1389 /*
1390 * Add the interface route associated with the prefix. Before
1391 * installing the route, check if there's the same prefix on another
1392 * interface, and the prefix has already installed the interface route.
1393 * Although such a configuration is expected to be rare, we explicitly
1394 * allow it.
1395 */
1396 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1397 if (opr == pr)
1398 continue;
1399
1400 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
1401 continue;
1402
1403 if (opr->ndpr_plen == pr->ndpr_plen &&
1404 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1405 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen))
1406 return (0);
1407 }
1408
1409 /*
1410 * We prefer link-local addresses as the associated interface address.
1411 */
1412 /* search for a link-local addr */
1413 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
1414 IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
1415 if (ifa == NULL) {
1416 /* XXX: freebsd does not have ifa_ifwithaf */
1417 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1418 if (ifa->ifa_addr->sa_family == AF_INET6)
1419 break;
1420 }
1421 /* should we care about ia6_flags? */
1422 }
1423 if (ifa == NULL) {
1424 /*
1425 * This can still happen, when, for example, we receive an RA
1426 * containing a prefix with the L bit set and the A bit clear,
1427 * after removing all IPv6 addresses on the receiving
1428 * interface. This should, of course, be rare though.
1429 */
1430 nd6log((LOG_NOTICE,
1431 "nd6_prefix_onlink: failed to find any ifaddr"
1432 " to add route for a prefix(%s/%d) on %s\n",
1433 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1434 pr->ndpr_plen, if_name(ifp)));
1435 return (0);
1436 }
1437
1438 /*
1439 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1440 * ifa->ifa_rtrequest = nd6_rtrequest;
1441 */
1442 bzero(&mask6, sizeof(mask6));
1443 mask6.sin6_len = sizeof(mask6);
1444 mask6.sin6_addr = pr->ndpr_mask;
1445 rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP;
1446 if (nd6_need_cache(ifp)) {
1447 /* explicitly set in case ifa_flags does not set the flag. */
1448 rtflags |= RTF_CLONING;
1449 } else {
1450 /*
1451 * explicitly clear the cloning bit in case ifa_flags sets it.
1452 */
1453 rtflags &= ~RTF_CLONING;
1454 }
1455 error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix,
1456 ifa->ifa_addr, (struct sockaddr *)&mask6, rtflags, &rt);
1457 if (error == 0) {
1458 if (rt != NULL) /* this should be non NULL, though */
1459 nd6_rtmsg(RTM_ADD, rt);
1460 pr->ndpr_stateflags |= NDPRF_ONLINK;
1461 } else {
1462 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a"
1463 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
1464 "errno = %d\n",
1465 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1466 pr->ndpr_plen, if_name(ifp),
1467 ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
1468 ip6_sprintf(&mask6.sin6_addr), rtflags, error));
1469 }
1470
1471 if (rt != NULL) {
1472 RT_LOCK(rt);
1473 RT_REMREF(rt);
1474 RT_UNLOCK(rt);
1475 }
1476
1477 return (error);
1478 }
1479
1480 int
1481 nd6_prefix_offlink(pr)
1482 struct nd_prefix *pr;
1483 {
1484 int error = 0;
1485 struct ifnet *ifp = pr->ndpr_ifp;
1486 struct nd_prefix *opr;
1487 struct sockaddr_in6 sa6, mask6;
1488 struct rtentry *rt = NULL;
1489
1490 /* sanity check */
1491 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1492 nd6log((LOG_ERR,
1493 "nd6_prefix_offlink: %s/%d is already off-link\n",
1494 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen));
1495 return (EEXIST);
1496 }
1497
1498 bzero(&sa6, sizeof(sa6));
1499 sa6.sin6_family = AF_INET6;
1500 sa6.sin6_len = sizeof(sa6);
1501 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
1502 sizeof(struct in6_addr));
1503 bzero(&mask6, sizeof(mask6));
1504 mask6.sin6_family = AF_INET6;
1505 mask6.sin6_len = sizeof(sa6);
1506 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
1507 error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
1508 (struct sockaddr *)&mask6, 0, &rt);
1509 if (error == 0) {
1510 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
1511
1512 /* report the route deletion to the routing socket. */
1513 if (rt != NULL)
1514 nd6_rtmsg(RTM_DELETE, rt);
1515
1516 /*
1517 * There might be the same prefix on another interface,
1518 * the prefix which could not be on-link just because we have
1519 * the interface route (see comments in nd6_prefix_onlink).
1520 * If there's one, try to make the prefix on-link on the
1521 * interface.
1522 */
1523 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1524 if (opr == pr)
1525 continue;
1526
1527 if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
1528 continue;
1529
1530 /*
1531 * KAME specific: detached prefixes should not be
1532 * on-link.
1533 */
1534 if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1535 continue;
1536
1537 if (opr->ndpr_plen == pr->ndpr_plen &&
1538 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1539 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
1540 int e;
1541
1542 if ((e = nd6_prefix_onlink(opr)) != 0) {
1543 nd6log((LOG_ERR,
1544 "nd6_prefix_offlink: failed to "
1545 "recover a prefix %s/%d from %s "
1546 "to %s (errno = %d)\n",
1547 ip6_sprintf(&opr->ndpr_prefix.sin6_addr),
1548 opr->ndpr_plen, if_name(ifp),
1549 if_name(opr->ndpr_ifp), e));
1550 }
1551 }
1552 }
1553 } else {
1554 /* XXX: can we still set the NDPRF_ONLINK flag? */
1555 nd6log((LOG_ERR,
1556 "nd6_prefix_offlink: failed to delete route: "
1557 "%s/%d on %s (errno = %d)\n",
1558 ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp),
1559 error));
1560 }
1561
1562 if (rt != NULL) {
1563 RTFREE(rt);
1564 }
1565
1566 return (error);
1567 }
1568
1569 static struct in6_ifaddr *
1570 in6_ifadd(pr, ifid)
1571 struct nd_prefix *pr;
1572 struct in6_addr *ifid; /* Mobile IPv6 addition */
1573 {
1574 struct ifnet *ifp = pr->ndpr_ifp;
1575 struct ifaddr *ifa;
1576 struct in6_aliasreq ifra;
1577 struct in6_ifaddr *ia, *ib;
1578 int error, plen0;
1579 struct in6_addr mask;
1580 int prefixlen = pr->ndpr_plen;
1581
1582 in6_prefixlen2mask(&mask, prefixlen);
1583
1584 /*
1585 * find a link-local address (will be interface ID).
1586 * Is it really mandatory? Theoretically, a global or a site-local
1587 * address can be configured without a link-local address, if we
1588 * have a unique interface identifier...
1589 *
1590 * it is not mandatory to have a link-local address, we can generate
1591 * interface identifier on the fly. we do this because:
1592 * (1) it should be the easiest way to find interface identifier.
1593 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1594 * for multiple addresses on a single interface, and possible shortcut
1595 * of DAD. we omitted DAD for this reason in the past.
1596 * (3) a user can prevent autoconfiguration of global address
1597 * by removing link-local address by hand (this is partly because we
1598 * don't have other way to control the use of IPv6 on an interface.
1599 * this has been our design choice - cf. NRL's "ifconfig auto").
1600 * (4) it is easier to manage when an interface has addresses
1601 * with the same interface identifier, than to have multiple addresses
1602 * with different interface identifiers.
1603 *
1604 * Mobile IPv6 addition: allow for caller to specify a wished interface
1605 * ID. This is to not break connections when moving addresses between
1606 * interfaces.
1607 */
1608 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
1609 if (ifa)
1610 ib = (struct in6_ifaddr *)ifa;
1611 else
1612 return NULL;
1613
1614 #if 0 /* don't care link local addr state, and always do DAD */
1615 /* if link-local address is not eligible, do not autoconfigure. */
1616 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) {
1617 printf("in6_ifadd: link-local address not ready\n");
1618 return NULL;
1619 }
1620 #endif
1621
1622 /* prefixlen + ifidlen must be equal to 128 */
1623 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
1624 if (prefixlen != plen0) {
1625 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
1626 "(prefix=%d ifid=%d)\n",
1627 if_name(ifp), prefixlen, 128 - plen0));
1628 return NULL;
1629 }
1630
1631 /* make ifaddr */
1632
1633 bzero(&ifra, sizeof(ifra));
1634 /*
1635 * in6_update_ifa() does not use ifra_name, but we accurately set it
1636 * for safety.
1637 */
1638 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1639 ifra.ifra_addr.sin6_family = AF_INET6;
1640 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
1641 /* prefix */
1642 bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr,
1643 sizeof(ifra.ifra_addr.sin6_addr));
1644 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
1645 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
1646 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
1647 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
1648
1649 /* interface ID */
1650 if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid))
1651 ifid = &ib->ia_addr.sin6_addr;
1652 ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
1653 (ifid->s6_addr32[0] & ~mask.s6_addr32[0]);
1654 ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
1655 (ifid->s6_addr32[1] & ~mask.s6_addr32[1]);
1656 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
1657 (ifid->s6_addr32[2] & ~mask.s6_addr32[2]);
1658 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
1659 (ifid->s6_addr32[3] & ~mask.s6_addr32[3]);
1660
1661 /* new prefix mask. */
1662 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1663 ifra.ifra_prefixmask.sin6_family = AF_INET6;
1664 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
1665 sizeof(ifra.ifra_prefixmask.sin6_addr));
1666
1667 /*
1668 * lifetime.
1669 * XXX: in6_init_address_ltimes would override these values later.
1670 * We should reconsider this logic.
1671 */
1672 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
1673 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
1674
1675 /* XXX: scope zone ID? */
1676
1677 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
1678 /*
1679 * temporarily set the nopfx flag to avoid conflict.
1680 * XXX: we should reconsider the entire mechanism about prefix
1681 * manipulation.
1682 */
1683 ifra.ifra_flags |= IN6_IFF_NOPFX;
1684
1685 /*
1686 * keep the new address, regardless of the result of in6_update_ifa.
1687 * XXX: this address is now meaningless.
1688 * We should reconsider its role.
1689 */
1690 pr->ndpr_addr = ifra.ifra_addr.sin6_addr;
1691
1692 /* allocate ifaddr structure, link into chain, etc. */
1693 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
1694 nd6log((LOG_ERR,
1695 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
1696 ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp),
1697 error));
1698 return (NULL); /* ifaddr must not have been allocated. */
1699 }
1700
1701 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1702
1703 return (ia); /* this is always non-NULL */
1704 }
1705
1706 int
1707 in6_tmpifadd(ia0, forcegen)
1708 const struct in6_ifaddr *ia0; /* corresponding public address */
1709 int forcegen;
1710 {
1711 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
1712 struct in6_ifaddr *newia;
1713 struct in6_aliasreq ifra;
1714 int i, error;
1715 int trylimit = 3; /* XXX: adhoc value */
1716 u_int32_t randid[2];
1717 time_t vltime0, pltime0;
1718
1719 bzero(&ifra, sizeof(ifra));
1720 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1721 ifra.ifra_addr = ia0->ia_addr;
1722 /* copy prefix mask */
1723 ifra.ifra_prefixmask = ia0->ia_prefixmask;
1724 /* clear the old IFID */
1725 for (i = 0; i < 4; i++) {
1726 ifra.ifra_addr.sin6_addr.s6_addr32[i] &=
1727 ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
1728 }
1729
1730 again:
1731 in6_get_tmpifid(ifp, (u_int8_t *)randid,
1732 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen);
1733 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
1734 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
1735 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
1736 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
1737
1738 /*
1739 * If by chance the new temporary address is the same as an address
1740 * already assigned to the interface, generate a new randomized
1741 * interface identifier and repeat this step.
1742 * RFC 3041 3.3 (4).
1743 */
1744 if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) {
1745 if (trylimit-- == 0) {
1746 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find "
1747 "a unique random IFID\n"));
1748 return (EEXIST);
1749 }
1750 forcegen = 1;
1751 goto again;
1752 }
1753
1754 /*
1755 * The Valid Lifetime is the lower of the Valid Lifetime of the
1756 * public address or TEMP_VALID_LIFETIME.
1757 * The Preferred Lifetime is the lower of the Preferred Lifetime
1758 * of the public address or TEMP_PREFERRED_LIFETIME -
1759 * DESYNC_FACTOR.
1760 */
1761 if (ia0->ia6_lifetime.ia6t_expire != 0) {
1762 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
1763 (ia0->ia6_lifetime.ia6t_expire - time_second);
1764 if (vltime0 > ip6_temp_valid_lifetime)
1765 vltime0 = ip6_temp_valid_lifetime;
1766 } else
1767 vltime0 = ip6_temp_valid_lifetime;
1768 if (ia0->ia6_lifetime.ia6t_preferred != 0) {
1769 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
1770 (ia0->ia6_lifetime.ia6t_preferred - time_second);
1771 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor){
1772 pltime0 = ip6_temp_preferred_lifetime -
1773 ip6_desync_factor;
1774 }
1775 } else
1776 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor;
1777 ifra.ifra_lifetime.ia6t_vltime = vltime0;
1778 ifra.ifra_lifetime.ia6t_pltime = pltime0;
1779
1780 /*
1781 * A temporary address is created only if this calculated Preferred
1782 * Lifetime is greater than REGEN_ADVANCE time units.
1783 */
1784 if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance)
1785 return (0);
1786
1787 /* XXX: scope zone ID? */
1788
1789 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
1790
1791 /* allocate ifaddr structure, link into chain, etc. */
1792 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0)
1793 return (error);
1794
1795 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1796 if (newia == NULL) { /* XXX: can it happen? */
1797 nd6log((LOG_ERR,
1798 "in6_tmpifadd: ifa update succeeded, but we got "
1799 "no ifaddr\n"));
1800 return (EINVAL); /* XXX */
1801 }
1802 newia->ia6_ndpr = ia0->ia6_ndpr;
1803 newia->ia6_ndpr->ndpr_refcnt++;
1804
1805 /*
1806 * A newly added address might affect the status of other addresses.
1807 * XXX: when the temporary address is generated with a new public
1808 * address, the onlink check is redundant. However, it would be safe
1809 * to do the check explicitly everywhere a new address is generated,
1810 * and, in fact, we surely need the check when we create a new
1811 * temporary address due to deprecation of an old temporary address.
1812 */
1813 pfxlist_onlink_check();
1814
1815 return (0);
1816 }
1817
1818 int
1819 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
1820 {
1821 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */
1822 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) {
1823 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime"
1824 "(%d) is greater than valid lifetime(%d)\n",
1825 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime));
1826 return (EINVAL);
1827 }
1828 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
1829 ndpr->ndpr_preferred = 0;
1830 else
1831 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime;
1832 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
1833 ndpr->ndpr_expire = 0;
1834 else
1835 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime;
1836
1837 return 0;
1838 }
1839
1840 static void
1841 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
1842 {
1843 /* init ia6t_expire */
1844 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
1845 lt6->ia6t_expire = 0;
1846 else {
1847 lt6->ia6t_expire = time_second;
1848 lt6->ia6t_expire += lt6->ia6t_vltime;
1849 }
1850
1851 /* init ia6t_preferred */
1852 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
1853 lt6->ia6t_preferred = 0;
1854 else {
1855 lt6->ia6t_preferred = time_second;
1856 lt6->ia6t_preferred += lt6->ia6t_pltime;
1857 }
1858 }
1859
1860 /*
1861 * Delete all the routing table entries that use the specified gateway.
1862 * XXX: this function causes search through all entries of routing table, so
1863 * it shouldn't be called when acting as a router.
1864 */
1865 void
1866 rt6_flush(gateway, ifp)
1867 struct in6_addr *gateway;
1868 struct ifnet *ifp;
1869 {
1870 struct radix_node_head *rnh = rt_tables[AF_INET6];
1871 int s = splnet();
1872
1873 /* We'll care only link-local addresses */
1874 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) {
1875 splx(s);
1876 return;
1877 }
1878 /* XXX: hack for KAME's link-local address kludge */
1879 gateway->s6_addr16[1] = htons(ifp->if_index);
1880
1881 RADIX_NODE_HEAD_LOCK(rnh);
1882 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
1883 RADIX_NODE_HEAD_UNLOCK(rnh);
1884 splx(s);
1885 }
1886
1887 static int
1888 rt6_deleteroute(rn, arg)
1889 struct radix_node *rn;
1890 void *arg;
1891 {
1892 #define SIN6(s) ((struct sockaddr_in6 *)s)
1893 struct rtentry *rt = (struct rtentry *)rn;
1894 struct in6_addr *gate = (struct in6_addr *)arg;
1895
1896 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
1897 return (0);
1898
1899 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) {
1900 return (0);
1901 }
1902
1903 /*
1904 * Do not delete a static route.
1905 * XXX: this seems to be a bit ad-hoc. Should we consider the
1906 * 'cloned' bit instead?
1907 */
1908 if ((rt->rt_flags & RTF_STATIC) != 0)
1909 return (0);
1910
1911 /*
1912 * We delete only host route. This means, in particular, we don't
1913 * delete default route.
1914 */
1915 if ((rt->rt_flags & RTF_HOST) == 0)
1916 return (0);
1917
1918 return (rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
1919 rt_mask(rt), rt->rt_flags, 0));
1920 #undef SIN6
1921 }
1922
1923 int
1924 nd6_setdefaultiface(ifindex)
1925 int ifindex;
1926 {
1927 int error = 0;
1928
1929 if (ifindex < 0 || if_index < ifindex)
1930 return (EINVAL);
1931
1932 if (nd6_defifindex != ifindex) {
1933 nd6_defifindex = ifindex;
1934 if (nd6_defifindex > 0)
1935 nd6_defifp = ifnet_byindex(nd6_defifindex);
1936 else
1937 nd6_defifp = NULL;
1938
1939 /*
1940 * If the Default Router List is empty, install a route
1941 * to the specified interface as default or remove the default
1942 * route when the default interface becomes canceled.
1943 * The check for the queue is actually redundant, but
1944 * we do this here to avoid re-install the default route
1945 * if the list is NOT empty.
1946 */
1947 if (TAILQ_FIRST(&nd_defrouter) == NULL)
1948 defrouter_select();
1949
1950 /*
1951 * Our current implementation assumes one-to-one maping between
1952 * interfaces and links, so it would be natural to use the
1953 * default interface as the default link.
1954 */
1955 scope6_setdefault(nd6_defifp);
1956 }
1957
1958 return (error);
1959 }
Cache object: 64b42f734470861815fbdb8091db08ce
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