1 /* $FreeBSD: releng/5.0/sys/netinet6/nd6_rtr.c 95023 2002-04-19 04:46:24Z suz $ */
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 *ndpr,
80 struct in6_addrlifetime *lt6));
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 #if 0
118 struct in6_addr daddr6 = ip6->ip6_dst;
119 #endif
120 char *lladdr = NULL;
121 int lladdrlen = 0;
122 #if 0
123 struct sockaddr_dl *sdl = (struct sockaddr_dl *)NULL;
124 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL;
125 struct rtentry *rt = NULL;
126 int is_newentry;
127 #endif
128 union nd_opts ndopts;
129
130 /* If I'm not a router, ignore it. */
131 if (ip6_accept_rtadv != 0 || ip6_forwarding != 1)
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(&ip6->ip6_src),
139 ip6_sprintf(&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.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(&saddr6), ifp->if_addrlen, lladdrlen - 2));
180 goto bad;
181 }
182
183 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
184
185 freeit:
186 m_freem(m);
187 return;
188
189 bad:
190 icmp6stat.icp6s_badrs++;
191 m_freem(m);
192 }
193
194 /*
195 * Receive Router Advertisement Message.
196 *
197 * Based on RFC 2461
198 * TODO: on-link bit on prefix information
199 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
200 */
201 void
202 nd6_ra_input(m, off, icmp6len)
203 struct mbuf *m;
204 int off, icmp6len;
205 {
206 struct ifnet *ifp = m->m_pkthdr.rcvif;
207 struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index];
208 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
209 struct nd_router_advert *nd_ra;
210 struct in6_addr saddr6 = ip6->ip6_src;
211 #if 0
212 struct in6_addr daddr6 = ip6->ip6_dst;
213 int flags; /* = nd_ra->nd_ra_flags_reserved; */
214 int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0);
215 int is_other = ((flags & ND_RA_FLAG_OTHER) != 0);
216 #endif
217 union nd_opts ndopts;
218 struct nd_defrouter *dr;
219
220 if (ip6_accept_rtadv == 0)
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(&ip6->ip6_src),
227 ip6_sprintf(&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(&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.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 dr0.rtaddr = saddr6;
263 dr0.flags = nd_ra->nd_ra_flags_reserved;
264 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
265 dr0.expire = time_second + dr0.rtlifetime;
266 dr0.ifp = ifp;
267 dr0.advint = 0; /* Mobile IPv6 */
268 dr0.advint_expire = 0; /* Mobile IPv6 */
269 dr0.advints_lost = 0; /* Mobile IPv6 */
270 /* unspecified or not? (RFC 2461 6.3.4) */
271 if (advreachable) {
272 advreachable = ntohl(advreachable);
273 if (advreachable <= MAX_REACHABLE_TIME &&
274 ndi->basereachable != advreachable) {
275 ndi->basereachable = advreachable;
276 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
277 ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */
278 }
279 }
280 if (nd_ra->nd_ra_retransmit)
281 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
282 if (nd_ra->nd_ra_curhoplimit)
283 ndi->chlim = nd_ra->nd_ra_curhoplimit;
284 dr = defrtrlist_update(&dr0);
285 }
286
287 /*
288 * prefix
289 */
290 if (ndopts.nd_opts_pi) {
291 struct nd_opt_hdr *pt;
292 struct nd_opt_prefix_info *pi = NULL;
293 struct nd_prefix pr;
294
295 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
296 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
297 pt = (struct nd_opt_hdr *)((caddr_t)pt +
298 (pt->nd_opt_len << 3))) {
299 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
300 continue;
301 pi = (struct nd_opt_prefix_info *)pt;
302
303 if (pi->nd_opt_pi_len != 4) {
304 nd6log((LOG_INFO,
305 "nd6_ra_input: invalid option "
306 "len %d for prefix information option, "
307 "ignored\n", pi->nd_opt_pi_len));
308 continue;
309 }
310
311 if (128 < pi->nd_opt_pi_prefix_len) {
312 nd6log((LOG_INFO,
313 "nd6_ra_input: invalid prefix "
314 "len %d for prefix information option, "
315 "ignored\n", pi->nd_opt_pi_prefix_len));
316 continue;
317 }
318
319 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
320 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
321 nd6log((LOG_INFO,
322 "nd6_ra_input: invalid prefix "
323 "%s, ignored\n",
324 ip6_sprintf(&pi->nd_opt_pi_prefix)));
325 continue;
326 }
327
328 /* aggregatable unicast address, rfc2374 */
329 if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20
330 && pi->nd_opt_pi_prefix_len != 64) {
331 nd6log((LOG_INFO,
332 "nd6_ra_input: invalid prefixlen "
333 "%d for rfc2374 prefix %s, ignored\n",
334 pi->nd_opt_pi_prefix_len,
335 ip6_sprintf(&pi->nd_opt_pi_prefix)));
336 continue;
337 }
338
339 bzero(&pr, sizeof(pr));
340 pr.ndpr_prefix.sin6_family = AF_INET6;
341 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
342 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
343 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
344
345 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
346 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
347 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
348 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
349 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
350 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
351 pr.ndpr_pltime =
352 ntohl(pi->nd_opt_pi_preferred_time);
353
354 if (in6_init_prefix_ltimes(&pr))
355 continue; /* prefix lifetime init failed */
356
357 (void)prelist_update(&pr, dr, m);
358 }
359 }
360
361 /*
362 * MTU
363 */
364 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
365 u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
366
367 /* lower bound */
368 if (mtu < IPV6_MMTU) {
369 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
370 "mtu=%d sent from %s, ignoring\n",
371 mtu, ip6_sprintf(&ip6->ip6_src)));
372 goto skip;
373 }
374
375 /* upper bound */
376 if (ndi->maxmtu) {
377 if (mtu <= ndi->maxmtu) {
378 int change = (ndi->linkmtu != mtu);
379
380 ndi->linkmtu = mtu;
381 if (change) /* in6_maxmtu may change */
382 in6_setmaxmtu();
383 } else {
384 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
385 "mtu=%d sent from %s; "
386 "exceeds maxmtu %d, ignoring\n",
387 mtu, ip6_sprintf(&ip6->ip6_src),
388 ndi->maxmtu));
389 }
390 } else {
391 nd6log((LOG_INFO, "nd6_ra_input: mtu option "
392 "mtu=%d sent from %s; maxmtu unknown, "
393 "ignoring\n",
394 mtu, ip6_sprintf(&ip6->ip6_src)));
395 }
396 }
397
398 skip:
399
400 /*
401 * Source link layer address
402 */
403 {
404 char *lladdr = NULL;
405 int lladdrlen = 0;
406
407 if (ndopts.nd_opts_src_lladdr) {
408 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
409 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
410 }
411
412 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
413 nd6log((LOG_INFO,
414 "nd6_ra_input: lladdrlen mismatch for %s "
415 "(if %d, RA packet %d)\n",
416 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
417 goto bad;
418 }
419
420 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0);
421
422 /*
423 * Installing a link-layer address might change the state of the
424 * router's neighbor cache, which might also affect our on-link
425 * detection of adveritsed prefixes.
426 */
427 pfxlist_onlink_check();
428 }
429
430 freeit:
431 m_freem(m);
432 return;
433
434 bad:
435 icmp6stat.icp6s_badra++;
436 m_freem(m);
437 }
438
439 /*
440 * default router list proccessing sub routines
441 */
442
443 /* tell the change to user processes watching the routing socket. */
444 static void
445 nd6_rtmsg(cmd, rt)
446 int cmd;
447 struct rtentry *rt;
448 {
449 struct rt_addrinfo info;
450
451 bzero((caddr_t)&info, sizeof(info));
452 info.rti_info[RTAX_DST] = rt_key(rt);
453 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
454 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
455 info.rti_info[RTAX_IFP] =
456 (struct sockaddr *)TAILQ_FIRST(&rt->rt_ifp->if_addrlist);
457 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
458
459 rt_missmsg(cmd, &info, rt->rt_flags, 0);
460 }
461
462 void
463 defrouter_addreq(new)
464 struct nd_defrouter *new;
465 {
466 struct sockaddr_in6 def, mask, gate;
467 struct rtentry *newrt = NULL;
468 int s;
469
470 Bzero(&def, sizeof(def));
471 Bzero(&mask, sizeof(mask));
472 Bzero(&gate, sizeof(gate));
473
474 def.sin6_len = mask.sin6_len = gate.sin6_len
475 = sizeof(struct sockaddr_in6);
476 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
477 gate.sin6_addr = new->rtaddr;
478
479 s = splnet();
480 (void)rtrequest(RTM_ADD, (struct sockaddr *)&def,
481 (struct sockaddr *)&gate, (struct sockaddr *)&mask,
482 RTF_GATEWAY, &newrt);
483 if (newrt) {
484 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
485 newrt->rt_refcnt--;
486 }
487 splx(s);
488 return;
489 }
490
491 /* Add a route to a given interface as default */
492 void
493 defrouter_addifreq(ifp)
494 struct ifnet *ifp;
495 {
496 struct sockaddr_in6 def, mask;
497 struct ifaddr *ifa;
498 struct rtentry *newrt = NULL;
499 int error, flags;
500
501 bzero(&def, sizeof(def));
502 bzero(&mask, sizeof(mask));
503
504 def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6);
505 def.sin6_family = mask.sin6_family = AF_INET6;
506
507 /*
508 * Search for an ifaddr beloging to the specified interface.
509 * XXX: An IPv6 address are required to be assigned on the interface.
510 */
511 if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) {
512 nd6log((LOG_ERR, /* better error? */
513 "defrouter_addifreq: failed to find an ifaddr "
514 "to install a route to interface %s\n",
515 if_name(ifp)));
516 return;
517 }
518
519 flags = ifa->ifa_flags;
520 error = rtrequest(RTM_ADD, (struct sockaddr *)&def, ifa->ifa_addr,
521 (struct sockaddr *)&mask, flags, &newrt);
522 if (error != 0) {
523 nd6log((LOG_ERR,
524 "defrouter_addifreq: failed to install a route to "
525 "interface %s (errno = %d)\n",
526 if_name(ifp), error));
527
528 if (newrt) /* maybe unnecessary, but do it for safety */
529 newrt->rt_refcnt--;
530 } else {
531 if (newrt) {
532 nd6_rtmsg(RTM_ADD, newrt);
533 newrt->rt_refcnt--;
534 }
535 }
536 }
537
538 struct nd_defrouter *
539 defrouter_lookup(addr, ifp)
540 struct in6_addr *addr;
541 struct ifnet *ifp;
542 {
543 struct nd_defrouter *dr;
544
545 for (dr = TAILQ_FIRST(&nd_defrouter); dr;
546 dr = TAILQ_NEXT(dr, dr_entry)) {
547 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
548 return(dr);
549 }
550
551 return(NULL); /* search failed */
552 }
553
554 void
555 defrouter_delreq(dr, dofree)
556 struct nd_defrouter *dr;
557 int dofree;
558 {
559 struct sockaddr_in6 def, mask, gate;
560 struct rtentry *oldrt = NULL;
561
562 Bzero(&def, sizeof(def));
563 Bzero(&mask, sizeof(mask));
564 Bzero(&gate, sizeof(gate));
565
566 def.sin6_len = mask.sin6_len = gate.sin6_len
567 = sizeof(struct sockaddr_in6);
568 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
569 gate.sin6_addr = dr->rtaddr;
570
571 rtrequest(RTM_DELETE, (struct sockaddr *)&def,
572 (struct sockaddr *)&gate,
573 (struct sockaddr *)&mask,
574 RTF_GATEWAY, &oldrt);
575 if (oldrt) {
576 nd6_rtmsg(RTM_DELETE, oldrt);
577 if (oldrt->rt_refcnt <= 0) {
578 /*
579 * XXX: borrowed from the RTM_DELETE case of
580 * rtrequest().
581 */
582 oldrt->rt_refcnt++;
583 rtfree(oldrt);
584 }
585 }
586
587 if (dofree) /* XXX: necessary? */
588 free(dr, M_IP6NDP);
589 }
590
591 void
592 defrtrlist_del(dr)
593 struct nd_defrouter *dr;
594 {
595 struct nd_defrouter *deldr = NULL;
596 struct nd_prefix *pr;
597
598 /*
599 * Flush all the routing table entries that use the router
600 * as a next hop.
601 */
602 if (!ip6_forwarding && ip6_accept_rtadv) {
603 /* above is a good condition? */
604 rt6_flush(&dr->rtaddr, dr->ifp);
605 }
606
607 if (dr == TAILQ_FIRST(&nd_defrouter))
608 deldr = dr; /* The router is primary. */
609
610 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
611
612 /*
613 * Also delete all the pointers to the router in each prefix lists.
614 */
615 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
616 struct nd_pfxrouter *pfxrtr;
617 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
618 pfxrtr_del(pfxrtr);
619 }
620 pfxlist_onlink_check();
621
622 /*
623 * If the router is the primary one, choose a new one.
624 * Note that defrouter_select() will remove the current gateway
625 * from the routing table.
626 */
627 if (deldr)
628 defrouter_select();
629
630 free(dr, M_IP6NDP);
631 }
632
633 /*
634 * Default Router Selection according to Section 6.3.6 of RFC 2461:
635 * 1) Routers that are reachable or probably reachable should be
636 * preferred.
637 * 2) When no routers on the list are known to be reachable or
638 * probably reachable, routers SHOULD be selected in a round-robin
639 * fashion.
640 * 3) If the Default Router List is empty, assume that all
641 * destinations are on-link.
642 */
643 void
644 defrouter_select()
645 {
646 int s = splnet();
647 struct nd_defrouter *dr, anydr;
648 struct rtentry *rt = NULL;
649 struct llinfo_nd6 *ln = NULL;
650
651 /*
652 * Search for a (probably) reachable router from the list.
653 */
654 for (dr = TAILQ_FIRST(&nd_defrouter); dr;
655 dr = TAILQ_NEXT(dr, dr_entry)) {
656 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
657 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
658 ND6_IS_LLINFO_PROBREACH(ln)) {
659 /* Got it, and move it to the head */
660 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
661 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry);
662 break;
663 }
664 }
665
666 if ((dr = TAILQ_FIRST(&nd_defrouter))) {
667 /*
668 * De-install the previous default gateway and install
669 * a new one.
670 * Note that if there is no reachable router in the list,
671 * the head entry will be used anyway.
672 * XXX: do we have to check the current routing table entry?
673 */
674 bzero(&anydr, sizeof(anydr));
675 defrouter_delreq(&anydr, 0);
676 defrouter_addreq(dr);
677 }
678 else {
679 /*
680 * The Default Router List is empty, so install the default
681 * route to an inteface.
682 * XXX: The specification does not say this mechanism should
683 * be restricted to hosts, but this would be not useful
684 * (even harmful) for routers.
685 */
686 if (!ip6_forwarding) {
687 /*
688 * De-install the current default route
689 * in advance.
690 */
691 bzero(&anydr, sizeof(anydr));
692 defrouter_delreq(&anydr, 0);
693 if (nd6_defifp) {
694 /*
695 * Install a route to the default interface
696 * as default route.
697 * XXX: we enable this for host only, because
698 * this may override a default route installed
699 * a user process (e.g. routing daemon) in a
700 * router case.
701 */
702 defrouter_addifreq(nd6_defifp);
703 } else {
704 nd6log((LOG_INFO, "defrouter_select: "
705 "there's no default router and no default"
706 " interface\n"));
707 }
708 }
709 }
710
711 splx(s);
712 return;
713 }
714
715 static struct nd_defrouter *
716 defrtrlist_update(new)
717 struct nd_defrouter *new;
718 {
719 struct nd_defrouter *dr, *n;
720 int s = splnet();
721
722 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
723 /* entry exists */
724 if (new->rtlifetime == 0) {
725 defrtrlist_del(dr);
726 dr = NULL;
727 } else {
728 /* override */
729 dr->flags = new->flags; /* xxx flag check */
730 dr->rtlifetime = new->rtlifetime;
731 dr->expire = new->expire;
732 }
733 splx(s);
734 return(dr);
735 }
736
737 /* entry does not exist */
738 if (new->rtlifetime == 0) {
739 splx(s);
740 return(NULL);
741 }
742
743 n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
744 if (n == NULL) {
745 splx(s);
746 return(NULL);
747 }
748 bzero(n, sizeof(*n));
749 *n = *new;
750
751 /*
752 * Insert the new router at the end of the Default Router List.
753 * If there is no other router, install it anyway. Otherwise,
754 * just continue to use the current default router.
755 */
756 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry);
757 if (TAILQ_FIRST(&nd_defrouter) == n)
758 defrouter_select();
759 splx(s);
760
761 return(n);
762 }
763
764 static struct nd_pfxrouter *
765 pfxrtr_lookup(pr, dr)
766 struct nd_prefix *pr;
767 struct nd_defrouter *dr;
768 {
769 struct nd_pfxrouter *search;
770
771 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
772 if (search->router == dr)
773 break;
774 }
775
776 return(search);
777 }
778
779 static void
780 pfxrtr_add(pr, dr)
781 struct nd_prefix *pr;
782 struct nd_defrouter *dr;
783 {
784 struct nd_pfxrouter *new;
785
786 new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
787 if (new == NULL)
788 return;
789 bzero(new, sizeof(*new));
790 new->router = dr;
791
792 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
793
794 pfxlist_onlink_check();
795 }
796
797 static void
798 pfxrtr_del(pfr)
799 struct nd_pfxrouter *pfr;
800 {
801 LIST_REMOVE(pfr, pfr_entry);
802 free(pfr, M_IP6NDP);
803 }
804
805 struct nd_prefix *
806 nd6_prefix_lookup(pr)
807 struct nd_prefix *pr;
808 {
809 struct nd_prefix *search;
810
811 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) {
812 if (pr->ndpr_ifp == search->ndpr_ifp &&
813 pr->ndpr_plen == search->ndpr_plen &&
814 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
815 &search->ndpr_prefix.sin6_addr,
816 pr->ndpr_plen)
817 ) {
818 break;
819 }
820 }
821
822 return(search);
823 }
824
825 int
826 nd6_prelist_add(pr, dr, newp)
827 struct nd_prefix *pr, **newp;
828 struct nd_defrouter *dr;
829 {
830 struct nd_prefix *new = NULL;
831 int i, s;
832
833 new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
834 if (new == NULL)
835 return ENOMEM;
836 bzero(new, sizeof(*new));
837 *new = *pr;
838 if (newp != NULL)
839 *newp = new;
840
841 /* initilization */
842 LIST_INIT(&new->ndpr_advrtrs);
843 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
844 /* make prefix in the canonical form */
845 for (i = 0; i < 4; i++)
846 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
847 new->ndpr_mask.s6_addr32[i];
848
849 s = splnet();
850 /* link ndpr_entry to nd_prefix list */
851 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry);
852 splx(s);
853
854 /* ND_OPT_PI_FLAG_ONLINK processing */
855 if (new->ndpr_raf_onlink) {
856 int e;
857
858 if ((e = nd6_prefix_onlink(new)) != 0) {
859 nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
860 "the prefix %s/%d on-link on %s (errno=%d)\n",
861 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
862 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
863 /* proceed anyway. XXX: is it correct? */
864 }
865 }
866
867 if (dr) {
868 pfxrtr_add(new, dr);
869 }
870
871 return 0;
872 }
873
874 void
875 prelist_remove(pr)
876 struct nd_prefix *pr;
877 {
878 struct nd_pfxrouter *pfr, *next;
879 int e, s;
880
881 /* make sure to invalidate the prefix until it is really freed. */
882 pr->ndpr_vltime = 0;
883 pr->ndpr_pltime = 0;
884 #if 0
885 /*
886 * Though these flags are now meaningless, we'd rather keep the value
887 * not to confuse users when executing "ndp -p".
888 */
889 pr->ndpr_raf_onlink = 0;
890 pr->ndpr_raf_auto = 0;
891 #endif
892 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
893 (e = nd6_prefix_offlink(pr)) != 0) {
894 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
895 "on %s, errno=%d\n",
896 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
897 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
898 /* what should we do? */
899 }
900
901 if (pr->ndpr_refcnt > 0)
902 return; /* notice here? */
903
904 s = splnet();
905
906 /* unlink ndpr_entry from nd_prefix list */
907 LIST_REMOVE(pr, ndpr_entry);
908
909 /* free list of routers that adversed the prefix */
910 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
911 next = pfr->pfr_next;
912
913 free(pfr, M_IP6NDP);
914 }
915 splx(s);
916
917 free(pr, M_IP6NDP);
918
919 pfxlist_onlink_check();
920 }
921
922 int
923 prelist_update(new, dr, m)
924 struct nd_prefix *new;
925 struct nd_defrouter *dr; /* may be NULL */
926 struct mbuf *m;
927 {
928 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
929 struct ifaddr *ifa;
930 struct ifnet *ifp = new->ndpr_ifp;
931 struct nd_prefix *pr;
932 int s = splnet();
933 int error = 0;
934 int newprefix = 0;
935 int auth;
936 struct in6_addrlifetime lt6_tmp;
937
938 auth = 0;
939 if (m) {
940 /*
941 * Authenticity for NA consists authentication for
942 * both IP header and IP datagrams, doesn't it ?
943 */
944 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
945 auth = (m->m_flags & M_AUTHIPHDR
946 && m->m_flags & M_AUTHIPDGM) ? 1 : 0;
947 #endif
948 }
949
950
951 if ((pr = nd6_prefix_lookup(new)) != NULL) {
952 /*
953 * nd6_prefix_lookup() ensures that pr and new have the same
954 * prefix on a same interface.
955 */
956
957 /*
958 * Update prefix information. Note that the on-link (L) bit
959 * and the autonomous (A) bit should NOT be changed from 1
960 * to 0.
961 */
962 if (new->ndpr_raf_onlink == 1)
963 pr->ndpr_raf_onlink = 1;
964 if (new->ndpr_raf_auto == 1)
965 pr->ndpr_raf_auto = 1;
966 if (new->ndpr_raf_onlink) {
967 pr->ndpr_vltime = new->ndpr_vltime;
968 pr->ndpr_pltime = new->ndpr_pltime;
969 pr->ndpr_preferred = new->ndpr_preferred;
970 pr->ndpr_expire = new->ndpr_expire;
971 }
972
973 if (new->ndpr_raf_onlink &&
974 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
975 int e;
976
977 if ((e = nd6_prefix_onlink(pr)) != 0) {
978 nd6log((LOG_ERR,
979 "prelist_update: failed to make "
980 "the prefix %s/%d on-link on %s "
981 "(errno=%d)\n",
982 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
983 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
984 /* proceed anyway. XXX: is it correct? */
985 }
986 }
987
988 if (dr && pfxrtr_lookup(pr, dr) == NULL)
989 pfxrtr_add(pr, dr);
990 } else {
991 struct nd_prefix *newpr = NULL;
992
993 newprefix = 1;
994
995 if (new->ndpr_vltime == 0)
996 goto end;
997 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
998 goto end;
999
1000 bzero(&new->ndpr_addr, sizeof(struct in6_addr));
1001
1002 error = nd6_prelist_add(new, dr, &newpr);
1003 if (error != 0 || newpr == NULL) {
1004 nd6log((LOG_NOTICE, "prelist_update: "
1005 "nd6_prelist_add failed for %s/%d on %s "
1006 "errno=%d, returnpr=%p\n",
1007 ip6_sprintf(&new->ndpr_prefix.sin6_addr),
1008 new->ndpr_plen, if_name(new->ndpr_ifp),
1009 error, newpr));
1010 goto end; /* we should just give up in this case. */
1011 }
1012
1013 /*
1014 * XXX: from the ND point of view, we can ignore a prefix
1015 * with the on-link bit being zero. However, we need a
1016 * prefix structure for references from autoconfigured
1017 * addresses. Thus, we explicitly make suret that the prefix
1018 * itself expires now.
1019 */
1020 if (newpr->ndpr_raf_onlink == 0) {
1021 newpr->ndpr_vltime = 0;
1022 newpr->ndpr_pltime = 0;
1023 in6_init_prefix_ltimes(newpr);
1024 }
1025
1026 pr = newpr;
1027 }
1028
1029 /*
1030 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1031 * Note that pr must be non NULL at this point.
1032 */
1033
1034 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1035 if (!new->ndpr_raf_auto)
1036 goto afteraddrconf;
1037
1038 /*
1039 * 5.5.3 (b). the link-local prefix should have been ignored in
1040 * nd6_ra_input.
1041 */
1042
1043 /*
1044 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
1045 * This should have been done in nd6_ra_input.
1046 */
1047
1048 /*
1049 * 5.5.3 (d). If the prefix advertised does not match the prefix of an
1050 * address already in the list, and the Valid Lifetime is not 0,
1051 * form an address. Note that even a manually configured address
1052 * should reject autoconfiguration of a new address.
1053 */
1054 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1055 {
1056 struct in6_ifaddr *ifa6;
1057 int ifa_plen;
1058 u_int32_t storedlifetime;
1059
1060 if (ifa->ifa_addr->sa_family != AF_INET6)
1061 continue;
1062
1063 ifa6 = (struct in6_ifaddr *)ifa;
1064
1065 /*
1066 * Spec is not clear here, but I believe we should concentrate
1067 * on unicast (i.e. not anycast) addresses.
1068 * XXX: other ia6_flags? detached or duplicated?
1069 */
1070 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
1071 continue;
1072
1073 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL);
1074 if (ifa_plen != new->ndpr_plen ||
1075 !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr,
1076 &new->ndpr_prefix.sin6_addr,
1077 ifa_plen))
1078 continue;
1079
1080 if (ia6_match == NULL) /* remember the first one */
1081 ia6_match = ifa6;
1082
1083 if ((ifa6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1084 continue;
1085
1086 /*
1087 * An already autoconfigured address matched. Now that we
1088 * are sure there is at least one matched address, we can
1089 * proceed to 5.5.3. (e): update the lifetimes according to the
1090 * "two hours" rule and the privacy extension.
1091 */
1092 #define TWOHOUR (120*60)
1093 lt6_tmp = ifa6->ia6_lifetime;
1094
1095 storedlifetime = IFA6_IS_INVALID(ifa6) ? 0 :
1096 (lt6_tmp.ia6t_expire - time_second);
1097
1098 if (TWOHOUR < new->ndpr_vltime ||
1099 storedlifetime < new->ndpr_vltime) {
1100 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1101 } else if (storedlifetime <= TWOHOUR
1102 #if 0
1103 /*
1104 * This condition is logically redundant, so we just
1105 * omit it.
1106 * See IPng 6712, 6717, and 6721.
1107 */
1108 && new->ndpr_vltime <= storedlifetime
1109 #endif
1110 ) {
1111 if (auth) {
1112 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1113 }
1114 } else {
1115 /*
1116 * new->ndpr_vltime <= TWOHOUR &&
1117 * TWOHOUR < storedlifetime
1118 */
1119 lt6_tmp.ia6t_vltime = TWOHOUR;
1120 }
1121
1122 /* The 2 hour rule is not imposed for preferred lifetime. */
1123 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1124
1125 in6_init_address_ltimes(pr, <6_tmp);
1126
1127 /*
1128 * When adjusting the lifetimes of an existing temporary
1129 * address, only lower the lifetimes.
1130 * RFC 3041 3.3. (1).
1131 * XXX: how should we modify ia6t_[pv]ltime?
1132 */
1133 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
1134 if (lt6_tmp.ia6t_expire == 0 || /* no expire */
1135 lt6_tmp.ia6t_expire >
1136 ifa6->ia6_lifetime.ia6t_expire) {
1137 lt6_tmp.ia6t_expire =
1138 ifa6->ia6_lifetime.ia6t_expire;
1139 }
1140 if (lt6_tmp.ia6t_preferred == 0 || /* no expire */
1141 lt6_tmp.ia6t_preferred >
1142 ifa6->ia6_lifetime.ia6t_preferred) {
1143 lt6_tmp.ia6t_preferred =
1144 ifa6->ia6_lifetime.ia6t_preferred;
1145 }
1146 }
1147
1148 ifa6->ia6_lifetime = lt6_tmp;
1149 }
1150 if (ia6_match == NULL && new->ndpr_vltime) {
1151 /*
1152 * No address matched and the valid lifetime is non-zero.
1153 * Create a new address.
1154 */
1155 if ((ia6 = in6_ifadd(new, NULL)) != NULL) {
1156 /*
1157 * note that we should use pr (not new) for reference.
1158 */
1159 pr->ndpr_refcnt++;
1160 ia6->ia6_ndpr = pr;
1161
1162 #if 0
1163 /* XXXYYY Don't do this, according to Jinmei. */
1164 pr->ndpr_addr = new->ndpr_addr;
1165 #endif
1166
1167 /*
1168 * RFC 3041 3.3 (2).
1169 * When a new public address is created as described
1170 * in RFC2462, also create a new temporary address.
1171 *
1172 * RFC 3041 3.5.
1173 * When an interface connects to a new link, a new
1174 * randomized interface identifier should be generated
1175 * immediately together with a new set of temporary
1176 * addresses. Thus, we specifiy 1 as the 2nd arg of
1177 * in6_tmpifadd().
1178 */
1179 if (ip6_use_tempaddr) {
1180 int e;
1181 if ((e = in6_tmpifadd(ia6, 1)) != 0) {
1182 nd6log((LOG_NOTICE, "prelist_update: "
1183 "failed to create a temporary "
1184 "address, errno=%d\n",
1185 e));
1186 }
1187 }
1188
1189 /*
1190 * A newly added address might affect the status
1191 * of other addresses, so we check and update it.
1192 * XXX: what if address duplication happens?
1193 */
1194 pfxlist_onlink_check();
1195 } else {
1196 /* just set an error. do not bark here. */
1197 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1198 }
1199 }
1200
1201 afteraddrconf:
1202
1203 end:
1204 splx(s);
1205 return error;
1206 }
1207
1208 /*
1209 * A supplement function used in the on-link detection below;
1210 * detect if a given prefix has a (probably) reachable advertising router.
1211 * XXX: lengthy function name...
1212 */
1213 static struct nd_pfxrouter *
1214 find_pfxlist_reachable_router(pr)
1215 struct nd_prefix *pr;
1216 {
1217 struct nd_pfxrouter *pfxrtr;
1218 struct rtentry *rt;
1219 struct llinfo_nd6 *ln;
1220
1221 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr;
1222 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
1223 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0,
1224 pfxrtr->router->ifp)) &&
1225 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
1226 ND6_IS_LLINFO_PROBREACH(ln))
1227 break; /* found */
1228 }
1229
1230 return(pfxrtr);
1231
1232 }
1233
1234 /*
1235 * Check if each prefix in the prefix list has at least one available router
1236 * that advertised the prefix (a router is "available" if its neighbor cache
1237 * entry is reachable or probably reachable).
1238 * If the check fails, the prefix may be off-link, because, for example,
1239 * we have moved from the network but the lifetime of the prefix has not
1240 * expired yet. So we should not use the prefix if there is another prefix
1241 * that has an available router.
1242 * But, if there is no prefix that has an available router, we still regards
1243 * all the prefixes as on-link. This is because we can't tell if all the
1244 * routers are simply dead or if we really moved from the network and there
1245 * is no router around us.
1246 */
1247 void
1248 pfxlist_onlink_check()
1249 {
1250 struct nd_prefix *pr;
1251 struct in6_ifaddr *ifa;
1252
1253 /*
1254 * Check if there is a prefix that has a reachable advertising
1255 * router.
1256 */
1257 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1258 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1259 break;
1260 }
1261
1262 if (pr) {
1263 /*
1264 * There is at least one prefix that has a reachable router.
1265 * Detach prefixes which have no reachable advertising
1266 * router, and attach other prefixes.
1267 */
1268 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1269 /* XXX: a link-local prefix should never be detached */
1270 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1271 continue;
1272
1273 /*
1274 * we aren't interested in prefixes without the L bit
1275 * set.
1276 */
1277 if (pr->ndpr_raf_onlink == 0)
1278 continue;
1279
1280 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1281 find_pfxlist_reachable_router(pr) == NULL)
1282 pr->ndpr_stateflags |= NDPRF_DETACHED;
1283 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1284 find_pfxlist_reachable_router(pr) != 0)
1285 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1286 }
1287 } else {
1288 /* there is no prefix that has a reachable router */
1289 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1290 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1291 continue;
1292
1293 if (pr->ndpr_raf_onlink == 0)
1294 continue;
1295
1296 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1297 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1298 }
1299 }
1300
1301 /*
1302 * Remove each interface route associated with a (just) detached
1303 * prefix, and reinstall the interface route for a (just) attached
1304 * prefix. Note that all attempt of reinstallation does not
1305 * necessarily success, when a same prefix is shared among multiple
1306 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1307 * so we don't have to care about them.
1308 */
1309 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1310 int e;
1311
1312 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1313 continue;
1314
1315 if (pr->ndpr_raf_onlink == 0)
1316 continue;
1317
1318 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1319 (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1320 if ((e = nd6_prefix_offlink(pr)) != 0) {
1321 nd6log((LOG_ERR,
1322 "pfxlist_onlink_check: failed to "
1323 "make %s/%d offlink, errno=%d\n",
1324 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1325 pr->ndpr_plen, e));
1326 }
1327 }
1328 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1329 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 &&
1330 pr->ndpr_raf_onlink) {
1331 if ((e = nd6_prefix_onlink(pr)) != 0) {
1332 nd6log((LOG_ERR,
1333 "pfxlist_onlink_check: failed to "
1334 "make %s/%d offlink, errno=%d\n",
1335 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1336 pr->ndpr_plen, e));
1337 }
1338 }
1339 }
1340
1341 /*
1342 * Changes on the prefix status might affect address status as well.
1343 * Make sure that all addresses derived from an attached prefix are
1344 * attached, and that all addresses derived from a detached prefix are
1345 * detached. Note, however, that a manually configured address should
1346 * always be attached.
1347 * The precise detection logic is same as the one for prefixes.
1348 */
1349 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1350 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1351 continue;
1352
1353 if (ifa->ia6_ndpr == NULL) {
1354 /*
1355 * This can happen when we first configure the address
1356 * (i.e. the address exists, but the prefix does not).
1357 * XXX: complicated relationships...
1358 */
1359 continue;
1360 }
1361
1362 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1363 break;
1364 }
1365 if (ifa) {
1366 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1367 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1368 continue;
1369
1370 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1371 continue;
1372
1373 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1374 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1375 else
1376 ifa->ia6_flags |= IN6_IFF_DETACHED;
1377 }
1378 }
1379 else {
1380 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1381 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1382 continue;
1383
1384 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1385 }
1386 }
1387 }
1388
1389 int
1390 nd6_prefix_onlink(pr)
1391 struct nd_prefix *pr;
1392 {
1393 struct ifaddr *ifa;
1394 struct ifnet *ifp = pr->ndpr_ifp;
1395 struct sockaddr_in6 mask6;
1396 struct nd_prefix *opr;
1397 u_long rtflags;
1398 int error = 0;
1399 struct rtentry *rt = NULL;
1400
1401 /* sanity check */
1402 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1403 nd6log((LOG_ERR,
1404 "nd6_prefix_onlink: %s/%d is already on-link\n",
1405 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen);
1406 return(EEXIST));
1407 }
1408
1409 /*
1410 * Add the interface route associated with the prefix. Before
1411 * installing the route, check if there's the same prefix on another
1412 * interface, and the prefix has already installed the interface route.
1413 * Although such a configuration is expected to be rare, we explicitly
1414 * allow it.
1415 */
1416 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1417 if (opr == pr)
1418 continue;
1419
1420 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
1421 continue;
1422
1423 if (opr->ndpr_plen == pr->ndpr_plen &&
1424 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1425 &opr->ndpr_prefix.sin6_addr,
1426 pr->ndpr_plen))
1427 return(0);
1428 }
1429
1430 /*
1431 * We prefer link-local addresses as the associated interface address.
1432 */
1433 /* search for a link-local addr */
1434 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
1435 IN6_IFF_NOTREADY|
1436 IN6_IFF_ANYCAST);
1437 if (ifa == NULL) {
1438 /* XXX: freebsd does not have ifa_ifwithaf */
1439 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1440 {
1441 if (ifa->ifa_addr->sa_family == AF_INET6)
1442 break;
1443 }
1444 /* should we care about ia6_flags? */
1445 }
1446 if (ifa == NULL) {
1447 /*
1448 * This can still happen, when, for example, we receive an RA
1449 * containing a prefix with the L bit set and the A bit clear,
1450 * after removing all IPv6 addresses on the receiving
1451 * interface. This should, of course, be rare though.
1452 */
1453 nd6log((LOG_NOTICE,
1454 "nd6_prefix_onlink: failed to find any ifaddr"
1455 " to add route for a prefix(%s/%d) on %s\n",
1456 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1457 pr->ndpr_plen, if_name(ifp)));
1458 return(0);
1459 }
1460
1461 /*
1462 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1463 * ifa->ifa_rtrequest = nd6_rtrequest;
1464 */
1465 bzero(&mask6, sizeof(mask6));
1466 mask6.sin6_len = sizeof(mask6);
1467 mask6.sin6_addr = pr->ndpr_mask;
1468 rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP;
1469 if (nd6_need_cache(ifp)) {
1470 /* explicitly set in case ifa_flags does not set the flag. */
1471 rtflags |= RTF_CLONING;
1472 } else {
1473 /*
1474 * explicitly clear the cloning bit in case ifa_flags sets it.
1475 */
1476 rtflags &= ~RTF_CLONING;
1477 }
1478 error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix,
1479 ifa->ifa_addr, (struct sockaddr *)&mask6,
1480 rtflags, &rt);
1481 if (error == 0) {
1482 if (rt != NULL) /* this should be non NULL, though */
1483 nd6_rtmsg(RTM_ADD, rt);
1484 pr->ndpr_stateflags |= NDPRF_ONLINK;
1485 }
1486 else {
1487 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a"
1488 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
1489 "errno = %d\n",
1490 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1491 pr->ndpr_plen, if_name(ifp),
1492 ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
1493 ip6_sprintf(&mask6.sin6_addr), rtflags, error));
1494 }
1495
1496 if (rt != NULL)
1497 rt->rt_refcnt--;
1498
1499 return(error);
1500 }
1501
1502 int
1503 nd6_prefix_offlink(pr)
1504 struct nd_prefix *pr;
1505 {
1506 int error = 0;
1507 struct ifnet *ifp = pr->ndpr_ifp;
1508 struct nd_prefix *opr;
1509 struct sockaddr_in6 sa6, mask6;
1510 struct rtentry *rt = NULL;
1511
1512 /* sanity check */
1513 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1514 nd6log((LOG_ERR,
1515 "nd6_prefix_offlink: %s/%d is already off-link\n",
1516 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen));
1517 return(EEXIST);
1518 }
1519
1520 bzero(&sa6, sizeof(sa6));
1521 sa6.sin6_family = AF_INET6;
1522 sa6.sin6_len = sizeof(sa6);
1523 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
1524 sizeof(struct in6_addr));
1525 bzero(&mask6, sizeof(mask6));
1526 mask6.sin6_family = AF_INET6;
1527 mask6.sin6_len = sizeof(sa6);
1528 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
1529 error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
1530 (struct sockaddr *)&mask6, 0, &rt);
1531 if (error == 0) {
1532 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
1533
1534 /* report the route deletion to the routing socket. */
1535 if (rt != NULL)
1536 nd6_rtmsg(RTM_DELETE, rt);
1537
1538 /*
1539 * There might be the same prefix on another interface,
1540 * the prefix which could not be on-link just because we have
1541 * the interface route (see comments in nd6_prefix_onlink).
1542 * If there's one, try to make the prefix on-link on the
1543 * interface.
1544 */
1545 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1546 if (opr == pr)
1547 continue;
1548
1549 if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
1550 continue;
1551
1552 /*
1553 * KAME specific: detached prefixes should not be
1554 * on-link.
1555 */
1556 if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1557 continue;
1558
1559 if (opr->ndpr_plen == pr->ndpr_plen &&
1560 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1561 &opr->ndpr_prefix.sin6_addr,
1562 pr->ndpr_plen)) {
1563 int e;
1564
1565 if ((e = nd6_prefix_onlink(opr)) != 0) {
1566 nd6log((LOG_ERR,
1567 "nd6_prefix_offlink: failed to "
1568 "recover a prefix %s/%d from %s "
1569 "to %s (errno = %d)\n",
1570 ip6_sprintf(&opr->ndpr_prefix.sin6_addr),
1571 opr->ndpr_plen, if_name(ifp),
1572 if_name(opr->ndpr_ifp), e));
1573 }
1574 }
1575 }
1576 }
1577 else {
1578 /* XXX: can we still set the NDPRF_ONLINK flag? */
1579 nd6log((LOG_ERR,
1580 "nd6_prefix_offlink: failed to delete route: "
1581 "%s/%d on %s (errno = %d)\n",
1582 ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp),
1583 error));
1584 }
1585
1586 if (rt != NULL) {
1587 if (rt->rt_refcnt <= 0) {
1588 /* XXX: we should free the entry ourselves. */
1589 rt->rt_refcnt++;
1590 rtfree(rt);
1591 }
1592 }
1593
1594 return(error);
1595 }
1596
1597 static struct in6_ifaddr *
1598 in6_ifadd(pr, ifid)
1599 struct nd_prefix *pr;
1600 struct in6_addr *ifid; /* Mobile IPv6 addition */
1601 {
1602 struct ifnet *ifp = pr->ndpr_ifp;
1603 struct ifaddr *ifa;
1604 struct in6_aliasreq ifra;
1605 struct in6_ifaddr *ia, *ib;
1606 int error, plen0;
1607 struct in6_addr mask;
1608 int prefixlen = pr->ndpr_plen;
1609
1610 in6_len2mask(&mask, prefixlen);
1611
1612 /*
1613 * find a link-local address (will be interface ID).
1614 * Is it really mandatory? Theoretically, a global or a site-local
1615 * address can be configured without a link-local address, if we
1616 * have a unique interface identifier...
1617 *
1618 * it is not mandatory to have a link-local address, we can generate
1619 * interface identifier on the fly. we do this because:
1620 * (1) it should be the easiest way to find interface identifier.
1621 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1622 * for multiple addresses on a single interface, and possible shortcut
1623 * of DAD. we omitted DAD for this reason in the past.
1624 * (3) a user can prevent autoconfiguration of global address
1625 * by removing link-local address by hand (this is partly because we
1626 * don't have other way to control the use of IPv6 on a interface.
1627 * this has been our design choice - cf. NRL's "ifconfig auto").
1628 * (4) it is easier to manage when an interface has addresses
1629 * with the same interface identifier, than to have multiple addresses
1630 * with different interface identifiers.
1631 *
1632 * Mobile IPv6 addition: allow for caller to specify a wished interface
1633 * ID. This is to not break connections when moving addresses between
1634 * interfaces.
1635 */
1636 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */
1637 if (ifa)
1638 ib = (struct in6_ifaddr *)ifa;
1639 else
1640 return NULL;
1641
1642 #if 0 /* don't care link local addr state, and always do DAD */
1643 /* if link-local address is not eligible, do not autoconfigure. */
1644 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) {
1645 printf("in6_ifadd: link-local address not ready\n");
1646 return NULL;
1647 }
1648 #endif
1649
1650 /* prefixlen + ifidlen must be equal to 128 */
1651 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
1652 if (prefixlen != plen0) {
1653 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
1654 "(prefix=%d ifid=%d)\n",
1655 if_name(ifp), prefixlen, 128 - plen0));
1656 return NULL;
1657 }
1658
1659 /* make ifaddr */
1660
1661 bzero(&ifra, sizeof(ifra));
1662 /*
1663 * in6_update_ifa() does not use ifra_name, but we accurately set it
1664 * for safety.
1665 */
1666 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1667 ifra.ifra_addr.sin6_family = AF_INET6;
1668 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
1669 /* prefix */
1670 bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr,
1671 sizeof(ifra.ifra_addr.sin6_addr));
1672 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
1673 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
1674 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
1675 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
1676
1677 /* interface ID */
1678 if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid))
1679 ifid = &ib->ia_addr.sin6_addr;
1680 ifra.ifra_addr.sin6_addr.s6_addr32[0]
1681 |= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]);
1682 ifra.ifra_addr.sin6_addr.s6_addr32[1]
1683 |= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]);
1684 ifra.ifra_addr.sin6_addr.s6_addr32[2]
1685 |= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]);
1686 ifra.ifra_addr.sin6_addr.s6_addr32[3]
1687 |= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]);
1688
1689 /* new prefix mask. */
1690 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1691 ifra.ifra_prefixmask.sin6_family = AF_INET6;
1692 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
1693 sizeof(ifra.ifra_prefixmask.sin6_addr));
1694
1695 /*
1696 * lifetime.
1697 * XXX: in6_init_address_ltimes would override these values later.
1698 * We should reconsider this logic.
1699 */
1700 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
1701 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
1702
1703 /* XXX: scope zone ID? */
1704
1705 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
1706 /*
1707 * temporarily set the nopfx flag to avoid conflict.
1708 * XXX: we should reconsider the entire mechanism about prefix
1709 * manipulation.
1710 */
1711 ifra.ifra_flags |= IN6_IFF_NOPFX;
1712
1713 /*
1714 * keep the new address, regardless of the result of in6_update_ifa.
1715 * XXX: this address is now meaningless.
1716 * We should reconsider its role.
1717 */
1718 pr->ndpr_addr = ifra.ifra_addr.sin6_addr;
1719
1720 /* allocate ifaddr structure, link into chain, etc. */
1721 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
1722 nd6log((LOG_ERR,
1723 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
1724 ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp),
1725 error));
1726 return(NULL); /* ifaddr must not have been allocated. */
1727 }
1728
1729 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1730
1731 return(ia); /* this must NOT be NULL. */
1732 }
1733
1734 int
1735 in6_tmpifadd(ia0, forcegen)
1736 const struct in6_ifaddr *ia0; /* corresponding public address */
1737 int forcegen;
1738 {
1739 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
1740 struct in6_ifaddr *newia;
1741 struct in6_aliasreq ifra;
1742 int i, error;
1743 int trylimit = 3; /* XXX: adhoc value */
1744 u_int32_t randid[2];
1745 time_t vltime0, pltime0;
1746
1747 bzero(&ifra, sizeof(ifra));
1748 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1749 ifra.ifra_addr = ia0->ia_addr;
1750 /* copy prefix mask */
1751 ifra.ifra_prefixmask = ia0->ia_prefixmask;
1752 /* clear the old IFID */
1753 for (i = 0; i < 4; i++) {
1754 ifra.ifra_addr.sin6_addr.s6_addr32[i]
1755 &= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
1756 }
1757
1758 again:
1759 in6_get_tmpifid(ifp, (u_int8_t *)randid,
1760 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8],
1761 forcegen);
1762 ifra.ifra_addr.sin6_addr.s6_addr32[2]
1763 |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
1764 ifra.ifra_addr.sin6_addr.s6_addr32[3]
1765 |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
1766
1767 /*
1768 * If by chance the new temporary address is the same as an address
1769 * already assigned to the interface, generate a new randomized
1770 * interface identifier and repeat this step.
1771 * RFC 3041 3.3 (4).
1772 */
1773 if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) {
1774 if (trylimit-- == 0) {
1775 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find "
1776 "a unique random IFID\n"));
1777 return(EEXIST);
1778 }
1779 forcegen = 1;
1780 goto again;
1781 }
1782
1783 /*
1784 * The Valid Lifetime is the lower of the Valid Lifetime of the
1785 * public address or TEMP_VALID_LIFETIME.
1786 * The Preferred Lifetime is the lower of the Preferred Lifetime
1787 * of the public address or TEMP_PREFERRED_LIFETIME -
1788 * DESYNC_FACTOR.
1789 */
1790 if (ia0->ia6_lifetime.ia6t_expire != 0) {
1791 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
1792 (ia0->ia6_lifetime.ia6t_expire - time_second);
1793 if (vltime0 > ip6_temp_valid_lifetime)
1794 vltime0 = ip6_temp_valid_lifetime;
1795 } else
1796 vltime0 = ip6_temp_valid_lifetime;
1797 if (ia0->ia6_lifetime.ia6t_preferred != 0) {
1798 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
1799 (ia0->ia6_lifetime.ia6t_preferred - time_second);
1800 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor){
1801 pltime0 = ip6_temp_preferred_lifetime -
1802 ip6_desync_factor;
1803 }
1804 } else
1805 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor;
1806 ifra.ifra_lifetime.ia6t_vltime = vltime0;
1807 ifra.ifra_lifetime.ia6t_pltime = pltime0;
1808
1809 /*
1810 * A temporary address is created only if this calculated Preferred
1811 * Lifetime is greater than REGEN_ADVANCE time units.
1812 */
1813 if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance)
1814 return(0);
1815
1816 /* XXX: scope zone ID? */
1817
1818 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
1819
1820 /* allocate ifaddr structure, link into chain, etc. */
1821 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0)
1822 return(error);
1823
1824 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1825 if (newia == NULL) { /* XXX: can it happen? */
1826 nd6log((LOG_ERR,
1827 "in6_tmpifadd: ifa update succeeded, but we got "
1828 "no ifaddr\n"));
1829 return(EINVAL); /* XXX */
1830 }
1831 newia->ia6_ndpr = ia0->ia6_ndpr;
1832 newia->ia6_ndpr->ndpr_refcnt++;
1833
1834 /*
1835 * A newly added address might affect the status of other addresses.
1836 * XXX: when the temporary address is generated with a new public
1837 * address, the onlink check is redundant. However, it would be safe
1838 * to do the check explicitly everywhere a new address is generated,
1839 * and, in fact, we surely need the check when we create a new
1840 * temporary address due to deprecation of an old temporary address.
1841 */
1842 pfxlist_onlink_check();
1843
1844 return(0);
1845 }
1846
1847 int
1848 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
1849 {
1850 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */
1851 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) {
1852 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime"
1853 "(%d) is greater than valid lifetime(%d)\n",
1854 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime));
1855 return (EINVAL);
1856 }
1857 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
1858 ndpr->ndpr_preferred = 0;
1859 else
1860 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime;
1861 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
1862 ndpr->ndpr_expire = 0;
1863 else
1864 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime;
1865
1866 return 0;
1867 }
1868
1869 static void
1870 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
1871 {
1872 /* Valid lifetime must not be updated unless explicitly specified. */
1873 /* init ia6t_expire */
1874 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
1875 lt6->ia6t_expire = 0;
1876 else {
1877 lt6->ia6t_expire = time_second;
1878 lt6->ia6t_expire += lt6->ia6t_vltime;
1879 }
1880
1881 /* init ia6t_preferred */
1882 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
1883 lt6->ia6t_preferred = 0;
1884 else {
1885 lt6->ia6t_preferred = time_second;
1886 lt6->ia6t_preferred += lt6->ia6t_pltime;
1887 }
1888 }
1889
1890 /*
1891 * Delete all the routing table entries that use the specified gateway.
1892 * XXX: this function causes search through all entries of routing table, so
1893 * it shouldn't be called when acting as a router.
1894 */
1895 void
1896 rt6_flush(gateway, ifp)
1897 struct in6_addr *gateway;
1898 struct ifnet *ifp;
1899 {
1900 struct radix_node_head *rnh = rt_tables[AF_INET6];
1901 int s = splnet();
1902
1903 /* We'll care only link-local addresses */
1904 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) {
1905 splx(s);
1906 return;
1907 }
1908 /* XXX: hack for KAME's link-local address kludge */
1909 gateway->s6_addr16[1] = htons(ifp->if_index);
1910
1911 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
1912 splx(s);
1913 }
1914
1915 static int
1916 rt6_deleteroute(rn, arg)
1917 struct radix_node *rn;
1918 void *arg;
1919 {
1920 #define SIN6(s) ((struct sockaddr_in6 *)s)
1921 struct rtentry *rt = (struct rtentry *)rn;
1922 struct in6_addr *gate = (struct in6_addr *)arg;
1923
1924 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
1925 return(0);
1926
1927 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr))
1928 return(0);
1929
1930 /*
1931 * Do not delete a static route.
1932 * XXX: this seems to be a bit ad-hoc. Should we consider the
1933 * 'cloned' bit instead?
1934 */
1935 if ((rt->rt_flags & RTF_STATIC) != 0)
1936 return(0);
1937
1938 /*
1939 * We delete only host route. This means, in particular, we don't
1940 * delete default route.
1941 */
1942 if ((rt->rt_flags & RTF_HOST) == 0)
1943 return(0);
1944
1945 return(rtrequest(RTM_DELETE, rt_key(rt),
1946 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0));
1947 #undef SIN6
1948 }
1949
1950 int
1951 nd6_setdefaultiface(ifindex)
1952 int ifindex;
1953 {
1954 int error = 0;
1955
1956 if (ifindex < 0 || if_index < ifindex)
1957 return(EINVAL);
1958
1959 if (nd6_defifindex != ifindex) {
1960 nd6_defifindex = ifindex;
1961 if (nd6_defifindex > 0)
1962 nd6_defifp = ifnet_byindex(nd6_defifindex);
1963 else
1964 nd6_defifp = NULL;
1965
1966 /*
1967 * If the Default Router List is empty, install a route
1968 * to the specified interface as default or remove the default
1969 * route when the default interface becomes canceled.
1970 * The check for the queue is actually redundant, but
1971 * we do this here to avoid re-install the default route
1972 * if the list is NOT empty.
1973 */
1974 if (TAILQ_FIRST(&nd_defrouter) == NULL)
1975 defrouter_select();
1976
1977 /*
1978 * Our current implementation assumes one-to-one maping between
1979 * interfaces and links, so it would be natural to use the
1980 * default interface as the default link.
1981 */
1982 scope6_setdefault(nd6_defifp);
1983 }
1984
1985 return(error);
1986 }
Cache object: b3589badafa48dd61f8f70ab49e0fa78
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