1 /* $FreeBSD: releng/5.1/sys/netinet6/nd6_rtr.c 112678 2003-03-26 17:37:35Z ume $ */
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 RTFREE(oldrt);
578 }
579
580 if (dofree) /* XXX: necessary? */
581 free(dr, M_IP6NDP);
582 }
583
584 void
585 defrtrlist_del(dr)
586 struct nd_defrouter *dr;
587 {
588 struct nd_defrouter *deldr = NULL;
589 struct nd_prefix *pr;
590
591 /*
592 * Flush all the routing table entries that use the router
593 * as a next hop.
594 */
595 if (!ip6_forwarding && ip6_accept_rtadv) {
596 /* above is a good condition? */
597 rt6_flush(&dr->rtaddr, dr->ifp);
598 }
599
600 if (dr == TAILQ_FIRST(&nd_defrouter))
601 deldr = dr; /* The router is primary. */
602
603 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
604
605 /*
606 * Also delete all the pointers to the router in each prefix lists.
607 */
608 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
609 struct nd_pfxrouter *pfxrtr;
610 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
611 pfxrtr_del(pfxrtr);
612 }
613 pfxlist_onlink_check();
614
615 /*
616 * If the router is the primary one, choose a new one.
617 * Note that defrouter_select() will remove the current gateway
618 * from the routing table.
619 */
620 if (deldr)
621 defrouter_select();
622
623 free(dr, M_IP6NDP);
624 }
625
626 /*
627 * Default Router Selection according to Section 6.3.6 of RFC 2461:
628 * 1) Routers that are reachable or probably reachable should be
629 * preferred.
630 * 2) When no routers on the list are known to be reachable or
631 * probably reachable, routers SHOULD be selected in a round-robin
632 * fashion.
633 * 3) If the Default Router List is empty, assume that all
634 * destinations are on-link.
635 */
636 void
637 defrouter_select()
638 {
639 int s = splnet();
640 struct nd_defrouter *dr, anydr;
641 struct rtentry *rt = NULL;
642 struct llinfo_nd6 *ln = NULL;
643
644 /*
645 * Search for a (probably) reachable router from the list.
646 */
647 for (dr = TAILQ_FIRST(&nd_defrouter); dr;
648 dr = TAILQ_NEXT(dr, dr_entry)) {
649 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
650 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
651 ND6_IS_LLINFO_PROBREACH(ln)) {
652 /* Got it, and move it to the head */
653 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
654 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry);
655 break;
656 }
657 }
658
659 if ((dr = TAILQ_FIRST(&nd_defrouter))) {
660 /*
661 * De-install the previous default gateway and install
662 * a new one.
663 * Note that if there is no reachable router in the list,
664 * the head entry will be used anyway.
665 * XXX: do we have to check the current routing table entry?
666 */
667 bzero(&anydr, sizeof(anydr));
668 defrouter_delreq(&anydr, 0);
669 defrouter_addreq(dr);
670 }
671 else {
672 /*
673 * The Default Router List is empty, so install the default
674 * route to an inteface.
675 * XXX: The specification does not say this mechanism should
676 * be restricted to hosts, but this would be not useful
677 * (even harmful) for routers.
678 */
679 if (!ip6_forwarding) {
680 /*
681 * De-install the current default route
682 * in advance.
683 */
684 bzero(&anydr, sizeof(anydr));
685 defrouter_delreq(&anydr, 0);
686 if (nd6_defifp) {
687 /*
688 * Install a route to the default interface
689 * as default route.
690 * XXX: we enable this for host only, because
691 * this may override a default route installed
692 * a user process (e.g. routing daemon) in a
693 * router case.
694 */
695 defrouter_addifreq(nd6_defifp);
696 } else {
697 nd6log((LOG_INFO, "defrouter_select: "
698 "there's no default router and no default"
699 " interface\n"));
700 }
701 }
702 }
703
704 splx(s);
705 return;
706 }
707
708 static struct nd_defrouter *
709 defrtrlist_update(new)
710 struct nd_defrouter *new;
711 {
712 struct nd_defrouter *dr, *n;
713 int s = splnet();
714
715 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
716 /* entry exists */
717 if (new->rtlifetime == 0) {
718 defrtrlist_del(dr);
719 dr = NULL;
720 } else {
721 /* override */
722 dr->flags = new->flags; /* xxx flag check */
723 dr->rtlifetime = new->rtlifetime;
724 dr->expire = new->expire;
725 }
726 splx(s);
727 return(dr);
728 }
729
730 /* entry does not exist */
731 if (new->rtlifetime == 0) {
732 splx(s);
733 return(NULL);
734 }
735
736 n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
737 if (n == NULL) {
738 splx(s);
739 return(NULL);
740 }
741 bzero(n, sizeof(*n));
742 *n = *new;
743
744 /*
745 * Insert the new router at the end of the Default Router List.
746 * If there is no other router, install it anyway. Otherwise,
747 * just continue to use the current default router.
748 */
749 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry);
750 if (TAILQ_FIRST(&nd_defrouter) == n)
751 defrouter_select();
752 splx(s);
753
754 return(n);
755 }
756
757 static struct nd_pfxrouter *
758 pfxrtr_lookup(pr, dr)
759 struct nd_prefix *pr;
760 struct nd_defrouter *dr;
761 {
762 struct nd_pfxrouter *search;
763
764 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
765 if (search->router == dr)
766 break;
767 }
768
769 return(search);
770 }
771
772 static void
773 pfxrtr_add(pr, dr)
774 struct nd_prefix *pr;
775 struct nd_defrouter *dr;
776 {
777 struct nd_pfxrouter *new;
778
779 new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
780 if (new == NULL)
781 return;
782 bzero(new, sizeof(*new));
783 new->router = dr;
784
785 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
786
787 pfxlist_onlink_check();
788 }
789
790 static void
791 pfxrtr_del(pfr)
792 struct nd_pfxrouter *pfr;
793 {
794 LIST_REMOVE(pfr, pfr_entry);
795 free(pfr, M_IP6NDP);
796 }
797
798 struct nd_prefix *
799 nd6_prefix_lookup(pr)
800 struct nd_prefix *pr;
801 {
802 struct nd_prefix *search;
803
804 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) {
805 if (pr->ndpr_ifp == search->ndpr_ifp &&
806 pr->ndpr_plen == search->ndpr_plen &&
807 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
808 &search->ndpr_prefix.sin6_addr,
809 pr->ndpr_plen)
810 ) {
811 break;
812 }
813 }
814
815 return(search);
816 }
817
818 int
819 nd6_prelist_add(pr, dr, newp)
820 struct nd_prefix *pr, **newp;
821 struct nd_defrouter *dr;
822 {
823 struct nd_prefix *new = NULL;
824 int i, s;
825
826 new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
827 if (new == NULL)
828 return ENOMEM;
829 bzero(new, sizeof(*new));
830 *new = *pr;
831 if (newp != NULL)
832 *newp = new;
833
834 /* initilization */
835 LIST_INIT(&new->ndpr_advrtrs);
836 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
837 /* make prefix in the canonical form */
838 for (i = 0; i < 4; i++)
839 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
840 new->ndpr_mask.s6_addr32[i];
841
842 s = splnet();
843 /* link ndpr_entry to nd_prefix list */
844 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry);
845 splx(s);
846
847 /* ND_OPT_PI_FLAG_ONLINK processing */
848 if (new->ndpr_raf_onlink) {
849 int e;
850
851 if ((e = nd6_prefix_onlink(new)) != 0) {
852 nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
853 "the prefix %s/%d on-link on %s (errno=%d)\n",
854 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
855 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
856 /* proceed anyway. XXX: is it correct? */
857 }
858 }
859
860 if (dr) {
861 pfxrtr_add(new, dr);
862 }
863
864 return 0;
865 }
866
867 void
868 prelist_remove(pr)
869 struct nd_prefix *pr;
870 {
871 struct nd_pfxrouter *pfr, *next;
872 int e, s;
873
874 /* make sure to invalidate the prefix until it is really freed. */
875 pr->ndpr_vltime = 0;
876 pr->ndpr_pltime = 0;
877 #if 0
878 /*
879 * Though these flags are now meaningless, we'd rather keep the value
880 * not to confuse users when executing "ndp -p".
881 */
882 pr->ndpr_raf_onlink = 0;
883 pr->ndpr_raf_auto = 0;
884 #endif
885 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
886 (e = nd6_prefix_offlink(pr)) != 0) {
887 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
888 "on %s, errno=%d\n",
889 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
890 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
891 /* what should we do? */
892 }
893
894 if (pr->ndpr_refcnt > 0)
895 return; /* notice here? */
896
897 s = splnet();
898
899 /* unlink ndpr_entry from nd_prefix list */
900 LIST_REMOVE(pr, ndpr_entry);
901
902 /* free list of routers that adversed the prefix */
903 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
904 next = pfr->pfr_next;
905
906 free(pfr, M_IP6NDP);
907 }
908 splx(s);
909
910 free(pr, M_IP6NDP);
911
912 pfxlist_onlink_check();
913 }
914
915 int
916 prelist_update(new, dr, m)
917 struct nd_prefix *new;
918 struct nd_defrouter *dr; /* may be NULL */
919 struct mbuf *m;
920 {
921 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
922 struct ifaddr *ifa;
923 struct ifnet *ifp = new->ndpr_ifp;
924 struct nd_prefix *pr;
925 int s = splnet();
926 int error = 0;
927 int newprefix = 0;
928 int auth;
929 struct in6_addrlifetime lt6_tmp;
930
931 auth = 0;
932 if (m) {
933 /*
934 * Authenticity for NA consists authentication for
935 * both IP header and IP datagrams, doesn't it ?
936 */
937 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
938 auth = (m->m_flags & M_AUTHIPHDR
939 && m->m_flags & M_AUTHIPDGM) ? 1 : 0;
940 #endif
941 }
942
943
944 if ((pr = nd6_prefix_lookup(new)) != NULL) {
945 /*
946 * nd6_prefix_lookup() ensures that pr and new have the same
947 * prefix on a same interface.
948 */
949
950 /*
951 * Update prefix information. Note that the on-link (L) bit
952 * and the autonomous (A) bit should NOT be changed from 1
953 * to 0.
954 */
955 if (new->ndpr_raf_onlink == 1)
956 pr->ndpr_raf_onlink = 1;
957 if (new->ndpr_raf_auto == 1)
958 pr->ndpr_raf_auto = 1;
959 if (new->ndpr_raf_onlink) {
960 pr->ndpr_vltime = new->ndpr_vltime;
961 pr->ndpr_pltime = new->ndpr_pltime;
962 pr->ndpr_preferred = new->ndpr_preferred;
963 pr->ndpr_expire = new->ndpr_expire;
964 }
965
966 if (new->ndpr_raf_onlink &&
967 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
968 int e;
969
970 if ((e = nd6_prefix_onlink(pr)) != 0) {
971 nd6log((LOG_ERR,
972 "prelist_update: failed to make "
973 "the prefix %s/%d on-link on %s "
974 "(errno=%d)\n",
975 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
976 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
977 /* proceed anyway. XXX: is it correct? */
978 }
979 }
980
981 if (dr && pfxrtr_lookup(pr, dr) == NULL)
982 pfxrtr_add(pr, dr);
983 } else {
984 struct nd_prefix *newpr = NULL;
985
986 newprefix = 1;
987
988 if (new->ndpr_vltime == 0)
989 goto end;
990 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
991 goto end;
992
993 bzero(&new->ndpr_addr, sizeof(struct in6_addr));
994
995 error = nd6_prelist_add(new, dr, &newpr);
996 if (error != 0 || newpr == NULL) {
997 nd6log((LOG_NOTICE, "prelist_update: "
998 "nd6_prelist_add failed for %s/%d on %s "
999 "errno=%d, returnpr=%p\n",
1000 ip6_sprintf(&new->ndpr_prefix.sin6_addr),
1001 new->ndpr_plen, if_name(new->ndpr_ifp),
1002 error, newpr));
1003 goto end; /* we should just give up in this case. */
1004 }
1005
1006 /*
1007 * XXX: from the ND point of view, we can ignore a prefix
1008 * with the on-link bit being zero. However, we need a
1009 * prefix structure for references from autoconfigured
1010 * addresses. Thus, we explicitly make suret that the prefix
1011 * itself expires now.
1012 */
1013 if (newpr->ndpr_raf_onlink == 0) {
1014 newpr->ndpr_vltime = 0;
1015 newpr->ndpr_pltime = 0;
1016 in6_init_prefix_ltimes(newpr);
1017 }
1018
1019 pr = newpr;
1020 }
1021
1022 /*
1023 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1024 * Note that pr must be non NULL at this point.
1025 */
1026
1027 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1028 if (!new->ndpr_raf_auto)
1029 goto afteraddrconf;
1030
1031 /*
1032 * 5.5.3 (b). the link-local prefix should have been ignored in
1033 * nd6_ra_input.
1034 */
1035
1036 /*
1037 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
1038 * This should have been done in nd6_ra_input.
1039 */
1040
1041 /*
1042 * 5.5.3 (d). If the prefix advertised does not match the prefix of an
1043 * address already in the list, and the Valid Lifetime is not 0,
1044 * form an address. Note that even a manually configured address
1045 * should reject autoconfiguration of a new address.
1046 */
1047 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1048 {
1049 struct in6_ifaddr *ifa6;
1050 int ifa_plen;
1051 u_int32_t storedlifetime;
1052
1053 if (ifa->ifa_addr->sa_family != AF_INET6)
1054 continue;
1055
1056 ifa6 = (struct in6_ifaddr *)ifa;
1057
1058 /*
1059 * Spec is not clear here, but I believe we should concentrate
1060 * on unicast (i.e. not anycast) addresses.
1061 * XXX: other ia6_flags? detached or duplicated?
1062 */
1063 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
1064 continue;
1065
1066 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL);
1067 if (ifa_plen != new->ndpr_plen ||
1068 !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr,
1069 &new->ndpr_prefix.sin6_addr,
1070 ifa_plen))
1071 continue;
1072
1073 if (ia6_match == NULL) /* remember the first one */
1074 ia6_match = ifa6;
1075
1076 if ((ifa6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1077 continue;
1078
1079 /*
1080 * An already autoconfigured address matched. Now that we
1081 * are sure there is at least one matched address, we can
1082 * proceed to 5.5.3. (e): update the lifetimes according to the
1083 * "two hours" rule and the privacy extension.
1084 */
1085 #define TWOHOUR (120*60)
1086 lt6_tmp = ifa6->ia6_lifetime;
1087
1088 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1089 storedlifetime = ND6_INFINITE_LIFETIME;
1090 else if (IFA6_IS_INVALID(ifa6))
1091 storedlifetime = 0;
1092 else
1093 storedlifetime = lt6_tmp.ia6t_expire - time_second;
1094
1095 /* when not updating, keep the current stored lifetime. */
1096 lt6_tmp.ia6t_vltime = storedlifetime;
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 RTFREE(rt);
1588
1589 return(error);
1590 }
1591
1592 static struct in6_ifaddr *
1593 in6_ifadd(pr, ifid)
1594 struct nd_prefix *pr;
1595 struct in6_addr *ifid; /* Mobile IPv6 addition */
1596 {
1597 struct ifnet *ifp = pr->ndpr_ifp;
1598 struct ifaddr *ifa;
1599 struct in6_aliasreq ifra;
1600 struct in6_ifaddr *ia, *ib;
1601 int error, plen0;
1602 struct in6_addr mask;
1603 int prefixlen = pr->ndpr_plen;
1604
1605 in6_len2mask(&mask, prefixlen);
1606
1607 /*
1608 * find a link-local address (will be interface ID).
1609 * Is it really mandatory? Theoretically, a global or a site-local
1610 * address can be configured without a link-local address, if we
1611 * have a unique interface identifier...
1612 *
1613 * it is not mandatory to have a link-local address, we can generate
1614 * interface identifier on the fly. we do this because:
1615 * (1) it should be the easiest way to find interface identifier.
1616 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1617 * for multiple addresses on a single interface, and possible shortcut
1618 * of DAD. we omitted DAD for this reason in the past.
1619 * (3) a user can prevent autoconfiguration of global address
1620 * by removing link-local address by hand (this is partly because we
1621 * don't have other way to control the use of IPv6 on an interface.
1622 * this has been our design choice - cf. NRL's "ifconfig auto").
1623 * (4) it is easier to manage when an interface has addresses
1624 * with the same interface identifier, than to have multiple addresses
1625 * with different interface identifiers.
1626 *
1627 * Mobile IPv6 addition: allow for caller to specify a wished interface
1628 * ID. This is to not break connections when moving addresses between
1629 * interfaces.
1630 */
1631 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */
1632 if (ifa)
1633 ib = (struct in6_ifaddr *)ifa;
1634 else
1635 return NULL;
1636
1637 #if 0 /* don't care link local addr state, and always do DAD */
1638 /* if link-local address is not eligible, do not autoconfigure. */
1639 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) {
1640 printf("in6_ifadd: link-local address not ready\n");
1641 return NULL;
1642 }
1643 #endif
1644
1645 /* prefixlen + ifidlen must be equal to 128 */
1646 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
1647 if (prefixlen != plen0) {
1648 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
1649 "(prefix=%d ifid=%d)\n",
1650 if_name(ifp), prefixlen, 128 - plen0));
1651 return NULL;
1652 }
1653
1654 /* make ifaddr */
1655
1656 bzero(&ifra, sizeof(ifra));
1657 /*
1658 * in6_update_ifa() does not use ifra_name, but we accurately set it
1659 * for safety.
1660 */
1661 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1662 ifra.ifra_addr.sin6_family = AF_INET6;
1663 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
1664 /* prefix */
1665 bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr,
1666 sizeof(ifra.ifra_addr.sin6_addr));
1667 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
1668 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
1669 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
1670 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
1671
1672 /* interface ID */
1673 if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid))
1674 ifid = &ib->ia_addr.sin6_addr;
1675 ifra.ifra_addr.sin6_addr.s6_addr32[0]
1676 |= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]);
1677 ifra.ifra_addr.sin6_addr.s6_addr32[1]
1678 |= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]);
1679 ifra.ifra_addr.sin6_addr.s6_addr32[2]
1680 |= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]);
1681 ifra.ifra_addr.sin6_addr.s6_addr32[3]
1682 |= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]);
1683
1684 /* new prefix mask. */
1685 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1686 ifra.ifra_prefixmask.sin6_family = AF_INET6;
1687 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
1688 sizeof(ifra.ifra_prefixmask.sin6_addr));
1689
1690 /*
1691 * lifetime.
1692 * XXX: in6_init_address_ltimes would override these values later.
1693 * We should reconsider this logic.
1694 */
1695 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
1696 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
1697
1698 /* XXX: scope zone ID? */
1699
1700 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
1701 /*
1702 * temporarily set the nopfx flag to avoid conflict.
1703 * XXX: we should reconsider the entire mechanism about prefix
1704 * manipulation.
1705 */
1706 ifra.ifra_flags |= IN6_IFF_NOPFX;
1707
1708 /*
1709 * keep the new address, regardless of the result of in6_update_ifa.
1710 * XXX: this address is now meaningless.
1711 * We should reconsider its role.
1712 */
1713 pr->ndpr_addr = ifra.ifra_addr.sin6_addr;
1714
1715 /* allocate ifaddr structure, link into chain, etc. */
1716 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
1717 nd6log((LOG_ERR,
1718 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
1719 ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp),
1720 error));
1721 return(NULL); /* ifaddr must not have been allocated. */
1722 }
1723
1724 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1725
1726 return(ia); /* this must NOT be NULL. */
1727 }
1728
1729 int
1730 in6_tmpifadd(ia0, forcegen)
1731 const struct in6_ifaddr *ia0; /* corresponding public address */
1732 int forcegen;
1733 {
1734 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
1735 struct in6_ifaddr *newia;
1736 struct in6_aliasreq ifra;
1737 int i, error;
1738 int trylimit = 3; /* XXX: adhoc value */
1739 u_int32_t randid[2];
1740 time_t vltime0, pltime0;
1741
1742 bzero(&ifra, sizeof(ifra));
1743 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1744 ifra.ifra_addr = ia0->ia_addr;
1745 /* copy prefix mask */
1746 ifra.ifra_prefixmask = ia0->ia_prefixmask;
1747 /* clear the old IFID */
1748 for (i = 0; i < 4; i++) {
1749 ifra.ifra_addr.sin6_addr.s6_addr32[i]
1750 &= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
1751 }
1752
1753 again:
1754 in6_get_tmpifid(ifp, (u_int8_t *)randid,
1755 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8],
1756 forcegen);
1757 ifra.ifra_addr.sin6_addr.s6_addr32[2]
1758 |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
1759 ifra.ifra_addr.sin6_addr.s6_addr32[3]
1760 |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
1761
1762 /*
1763 * If by chance the new temporary address is the same as an address
1764 * already assigned to the interface, generate a new randomized
1765 * interface identifier and repeat this step.
1766 * RFC 3041 3.3 (4).
1767 */
1768 if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) {
1769 if (trylimit-- == 0) {
1770 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find "
1771 "a unique random IFID\n"));
1772 return(EEXIST);
1773 }
1774 forcegen = 1;
1775 goto again;
1776 }
1777
1778 /*
1779 * The Valid Lifetime is the lower of the Valid Lifetime of the
1780 * public address or TEMP_VALID_LIFETIME.
1781 * The Preferred Lifetime is the lower of the Preferred Lifetime
1782 * of the public address or TEMP_PREFERRED_LIFETIME -
1783 * DESYNC_FACTOR.
1784 */
1785 if (ia0->ia6_lifetime.ia6t_expire != 0) {
1786 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
1787 (ia0->ia6_lifetime.ia6t_expire - time_second);
1788 if (vltime0 > ip6_temp_valid_lifetime)
1789 vltime0 = ip6_temp_valid_lifetime;
1790 } else
1791 vltime0 = ip6_temp_valid_lifetime;
1792 if (ia0->ia6_lifetime.ia6t_preferred != 0) {
1793 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
1794 (ia0->ia6_lifetime.ia6t_preferred - time_second);
1795 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor){
1796 pltime0 = ip6_temp_preferred_lifetime -
1797 ip6_desync_factor;
1798 }
1799 } else
1800 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor;
1801 ifra.ifra_lifetime.ia6t_vltime = vltime0;
1802 ifra.ifra_lifetime.ia6t_pltime = pltime0;
1803
1804 /*
1805 * A temporary address is created only if this calculated Preferred
1806 * Lifetime is greater than REGEN_ADVANCE time units.
1807 */
1808 if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance)
1809 return(0);
1810
1811 /* XXX: scope zone ID? */
1812
1813 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
1814
1815 /* allocate ifaddr structure, link into chain, etc. */
1816 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0)
1817 return(error);
1818
1819 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1820 if (newia == NULL) { /* XXX: can it happen? */
1821 nd6log((LOG_ERR,
1822 "in6_tmpifadd: ifa update succeeded, but we got "
1823 "no ifaddr\n"));
1824 return(EINVAL); /* XXX */
1825 }
1826 newia->ia6_ndpr = ia0->ia6_ndpr;
1827 newia->ia6_ndpr->ndpr_refcnt++;
1828
1829 /*
1830 * A newly added address might affect the status of other addresses.
1831 * XXX: when the temporary address is generated with a new public
1832 * address, the onlink check is redundant. However, it would be safe
1833 * to do the check explicitly everywhere a new address is generated,
1834 * and, in fact, we surely need the check when we create a new
1835 * temporary address due to deprecation of an old temporary address.
1836 */
1837 pfxlist_onlink_check();
1838
1839 return(0);
1840 }
1841
1842 int
1843 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
1844 {
1845 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */
1846 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) {
1847 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime"
1848 "(%d) is greater than valid lifetime(%d)\n",
1849 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime));
1850 return (EINVAL);
1851 }
1852 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
1853 ndpr->ndpr_preferred = 0;
1854 else
1855 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime;
1856 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
1857 ndpr->ndpr_expire = 0;
1858 else
1859 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime;
1860
1861 return 0;
1862 }
1863
1864 static void
1865 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
1866 {
1867 /* init ia6t_expire */
1868 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
1869 lt6->ia6t_expire = 0;
1870 else {
1871 lt6->ia6t_expire = time_second;
1872 lt6->ia6t_expire += lt6->ia6t_vltime;
1873 }
1874
1875 /* init ia6t_preferred */
1876 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
1877 lt6->ia6t_preferred = 0;
1878 else {
1879 lt6->ia6t_preferred = time_second;
1880 lt6->ia6t_preferred += lt6->ia6t_pltime;
1881 }
1882 }
1883
1884 /*
1885 * Delete all the routing table entries that use the specified gateway.
1886 * XXX: this function causes search through all entries of routing table, so
1887 * it shouldn't be called when acting as a router.
1888 */
1889 void
1890 rt6_flush(gateway, ifp)
1891 struct in6_addr *gateway;
1892 struct ifnet *ifp;
1893 {
1894 struct radix_node_head *rnh = rt_tables[AF_INET6];
1895 int s = splnet();
1896
1897 /* We'll care only link-local addresses */
1898 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) {
1899 splx(s);
1900 return;
1901 }
1902 /* XXX: hack for KAME's link-local address kludge */
1903 gateway->s6_addr16[1] = htons(ifp->if_index);
1904
1905 RADIX_NODE_HEAD_LOCK(rnh);
1906 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
1907 RADIX_NODE_HEAD_UNLOCK(rnh);
1908 splx(s);
1909 }
1910
1911 static int
1912 rt6_deleteroute(rn, arg)
1913 struct radix_node *rn;
1914 void *arg;
1915 {
1916 #define SIN6(s) ((struct sockaddr_in6 *)s)
1917 struct rtentry *rt = (struct rtentry *)rn;
1918 struct in6_addr *gate = (struct in6_addr *)arg;
1919
1920 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
1921 return(0);
1922
1923 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr))
1924 return(0);
1925
1926 /*
1927 * Do not delete a static route.
1928 * XXX: this seems to be a bit ad-hoc. Should we consider the
1929 * 'cloned' bit instead?
1930 */
1931 if ((rt->rt_flags & RTF_STATIC) != 0)
1932 return(0);
1933
1934 /*
1935 * We delete only host route. This means, in particular, we don't
1936 * delete default route.
1937 */
1938 if ((rt->rt_flags & RTF_HOST) == 0)
1939 return(0);
1940
1941 return(rtrequest(RTM_DELETE, rt_key(rt),
1942 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0));
1943 #undef SIN6
1944 }
1945
1946 int
1947 nd6_setdefaultiface(ifindex)
1948 int ifindex;
1949 {
1950 int error = 0;
1951
1952 if (ifindex < 0 || if_index < ifindex)
1953 return(EINVAL);
1954
1955 if (nd6_defifindex != ifindex) {
1956 nd6_defifindex = ifindex;
1957 if (nd6_defifindex > 0)
1958 nd6_defifp = ifnet_byindex(nd6_defifindex);
1959 else
1960 nd6_defifp = NULL;
1961
1962 /*
1963 * If the Default Router List is empty, install a route
1964 * to the specified interface as default or remove the default
1965 * route when the default interface becomes canceled.
1966 * The check for the queue is actually redundant, but
1967 * we do this here to avoid re-install the default route
1968 * if the list is NOT empty.
1969 */
1970 if (TAILQ_FIRST(&nd_defrouter) == NULL)
1971 defrouter_select();
1972
1973 /*
1974 * Our current implementation assumes one-to-one maping between
1975 * interfaces and links, so it would be natural to use the
1976 * default interface as the default link.
1977 */
1978 scope6_setdefault(nd6_defifp);
1979 }
1980
1981 return(error);
1982 }
Cache object: f099da5296aa508534aaef88e120ea80
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