1 /* $FreeBSD: src/sys/netinet6/nd6_rtr.c,v 1.2.2.5 2003/04/05 10:28:53 ume Exp $ */
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 #include <sys/globaldata.h>
48 #include <sys/mutex.h>
49
50 #include <sys/mutex2.h>
51
52 #include <net/if.h>
53 #include <net/if_types.h>
54 #include <net/if_dl.h>
55 #include <net/route.h>
56 #include <net/radix.h>
57
58 #include <netinet/in.h>
59 #include <netinet6/in6_var.h>
60 #include <netinet6/in6_ifattach.h>
61 #include <netinet/ip6.h>
62 #include <netinet6/ip6_var.h>
63 #include <netinet6/nd6.h>
64 #include <netinet/icmp6.h>
65 #include <netinet6/scope6_var.h>
66
67 #include <net/net_osdep.h>
68
69 #define SDL(s) ((struct sockaddr_dl *)s)
70
71 static struct nd_defrouter *defrtrlist_update (struct nd_defrouter *);
72 static struct in6_ifaddr *in6_ifadd (struct nd_prefix *,
73 struct in6_addr *);
74 static struct nd_pfxrouter *pfxrtr_lookup (struct nd_prefix *,
75 struct nd_defrouter *);
76 static void pfxrtr_add (struct nd_prefix *, struct nd_defrouter *);
77 static void pfxrtr_del (struct nd_pfxrouter *);
78 static struct nd_pfxrouter *find_pfxlist_reachable_router
79 (struct nd_prefix *);
80 static void defrouter_addifreq (struct ifnet *);
81
82 static void in6_init_address_ltimes(struct nd_prefix *ndpr,
83 struct in6_addrlifetime *lt6);
84
85 static int rt6_deleteroute (struct radix_node *, void *);
86
87 extern int nd6_recalc_reachtm_interval;
88
89 static struct ifnet *nd6_defifp;
90 int nd6_defifindex;
91
92 int ip6_use_tempaddr = 0;
93
94 int ip6_desync_factor;
95 u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME;
96 u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME;
97 /*
98 * shorter lifetimes for debugging purposes.
99 int ip6_temp_preferred_lifetime = 800;
100 static int ip6_temp_valid_lifetime = 1800;
101 */
102 int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE;
103
104 /*
105 * Receive Router Solicitation Message - just for routers.
106 * Router solicitation/advertisement is mostly managed by userland program
107 * (rtadvd) so here we have no function like nd6_ra_output().
108 *
109 * Based on RFC 2461
110 */
111 void
nd6_rs_input(struct mbuf * m,int off,int icmp6len)112 nd6_rs_input(struct mbuf *m, int off, int icmp6len)
113 {
114 struct ifnet *ifp = m->m_pkthdr.rcvif;
115 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
116 struct nd_router_solicit *nd_rs;
117 struct in6_addr saddr6 = ip6->ip6_src;
118 char *lladdr = NULL;
119 int lladdrlen = 0;
120 #if 0
121 struct sockaddr_dl *sdl = NULL;
122 struct llinfo_nd6 *ln = NULL;
123 struct rtentry *rt = NULL;
124 int is_newentry;
125 #endif
126 union nd_opts ndopts;
127
128 /* If I'm not a router, ignore it. */
129 if (!ip6_forwarding)
130 goto freeit;
131
132 /* Sanity checks */
133 if (ip6->ip6_hlim != 255) {
134 nd6log((LOG_ERR,
135 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
136 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
137 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
138 goto bad;
139 }
140
141 /*
142 * Don't update the neighbor cache, if src = ::.
143 * This indicates that the src has no IP address assigned yet.
144 */
145 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
146 goto freeit;
147
148 #ifndef PULLDOWN_TEST
149 IP6_EXTHDR_CHECK(m, off, icmp6len,);
150 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
151 #else
152 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
153 if (nd_rs == NULL) {
154 icmp6stat.icp6s_tooshort++;
155 return;
156 }
157 #endif
158
159 icmp6len -= sizeof(*nd_rs);
160 nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
161 if (nd6_options(&ndopts) < 0) {
162 nd6log((LOG_INFO,
163 "nd6_rs_input: invalid ND option, ignored\n"));
164 /* nd6_options have incremented stats */
165 goto freeit;
166 }
167
168 if (ndopts.nd_opts_src_lladdr) {
169 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
170 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
171 }
172
173 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
174 nd6log((LOG_INFO,
175 "nd6_rs_input: lladdrlen mismatch for %s "
176 "(if %d, RS packet %d)\n",
177 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
178 goto bad;
179 }
180
181 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
182
183 freeit:
184 m_freem(m);
185 return;
186
187 bad:
188 icmp6stat.icp6s_badrs++;
189 m_freem(m);
190 }
191
192 /*
193 * Receive Router Advertisement Message.
194 *
195 * Based on RFC 2461
196 * TODO: on-link bit on prefix information
197 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
198 */
199 void
nd6_ra_input(struct mbuf * m,int off,int icmp6len)200 nd6_ra_input(struct mbuf *m, int off, int icmp6len)
201 {
202 struct ifnet *ifp = m->m_pkthdr.rcvif;
203 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
204 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
205 struct nd_router_advert *nd_ra;
206 struct in6_addr saddr6 = ip6->ip6_src;
207 #if 0
208 struct in6_addr daddr6 = ip6->ip6_dst;
209 int flags; /* = nd_ra->nd_ra_flags_reserved; */
210 int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0);
211 int is_other = ((flags & ND_RA_FLAG_OTHER) != 0);
212 #endif
213 union nd_opts ndopts;
214 struct nd_defrouter *dr;
215
216 /*
217 * We only accept RAs only when
218 * the node is not a router, and
219 * per-interface variable allows RAs on the receiving interface.
220 */
221 if (ip6_forwarding || !(ndi->flags & ND6_IFF_ACCEPT_RTADV))
222 goto freeit;
223
224 if (ip6->ip6_hlim != 255) {
225 nd6log((LOG_ERR,
226 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
227 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
228 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
229 goto bad;
230 }
231
232 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
233 nd6log((LOG_ERR,
234 "nd6_ra_input: src %s is not link-local\n",
235 ip6_sprintf(&saddr6)));
236 goto bad;
237 }
238
239 #ifndef PULLDOWN_TEST
240 IP6_EXTHDR_CHECK(m, off, icmp6len,);
241 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
242 #else
243 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
244 if (nd_ra == NULL) {
245 icmp6stat.icp6s_tooshort++;
246 return;
247 }
248 #endif
249
250 icmp6len -= sizeof(*nd_ra);
251 nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
252 if (nd6_options(&ndopts) < 0) {
253 nd6log((LOG_INFO,
254 "nd6_ra_input: invalid ND option, ignored\n"));
255 /* nd6_options have incremented stats */
256 goto freeit;
257 }
258
259 {
260 struct nd_defrouter dr0;
261 u_int32_t advreachable = nd_ra->nd_ra_reachable;
262
263 dr0.rtaddr = saddr6;
264 dr0.flags = nd_ra->nd_ra_flags_reserved;
265 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
266 dr0.expire = time_uptime + dr0.rtlifetime;
267 dr0.ifp = ifp;
268 dr0.advint = 0; /* Mobile IPv6 */
269 dr0.advint_expire = 0; /* Mobile IPv6 */
270 dr0.advints_lost = 0; /* Mobile IPv6 */
271 /* unspecified or not? (RFC 2461 6.3.4) */
272 if (advreachable) {
273 advreachable = ntohl(advreachable);
274 if (advreachable <= MAX_REACHABLE_TIME &&
275 ndi->basereachable != advreachable) {
276 ndi->basereachable = advreachable;
277 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
278 ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */
279 }
280 }
281 if (nd_ra->nd_ra_retransmit)
282 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
283 if (nd_ra->nd_ra_curhoplimit)
284 ndi->chlim = nd_ra->nd_ra_curhoplimit;
285 dr = defrtrlist_update(&dr0);
286 }
287
288 /*
289 * prefix
290 */
291 if (ndopts.nd_opts_pi) {
292 struct nd_opt_hdr *pt;
293 struct nd_opt_prefix_info *pi = NULL;
294 struct nd_prefix pr;
295
296 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
297 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
298 pt = (struct nd_opt_hdr *)((caddr_t)pt +
299 (pt->nd_opt_len << 3))) {
300 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
301 continue;
302 pi = (struct nd_opt_prefix_info *)pt;
303
304 if (pi->nd_opt_pi_len != 4) {
305 nd6log((LOG_INFO,
306 "nd6_ra_input: invalid option "
307 "len %d for prefix information option, "
308 "ignored\n", pi->nd_opt_pi_len));
309 continue;
310 }
311
312 if (128 < pi->nd_opt_pi_prefix_len) {
313 nd6log((LOG_INFO,
314 "nd6_ra_input: invalid prefix "
315 "len %d for prefix information option, "
316 "ignored\n", pi->nd_opt_pi_prefix_len));
317 continue;
318 }
319
320 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
321 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
322 nd6log((LOG_INFO,
323 "nd6_ra_input: invalid prefix "
324 "%s, ignored\n",
325 ip6_sprintf(&pi->nd_opt_pi_prefix)));
326 continue;
327 }
328
329 bzero(&pr, sizeof(pr));
330 pr.ndpr_prefix.sin6_family = AF_INET6;
331 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
332 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
333 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
334
335 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
336 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
337 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
338 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
339 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
340 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
341 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
342 if (in6_init_prefix_ltimes(&pr))
343 continue; /* prefix lifetime init failed */
344 prelist_update(&pr, dr, m);
345 }
346 }
347
348 /*
349 * MTU
350 */
351 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
352 u_long mtu, maxmtu;
353
354 mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
355
356 /* lower bound */
357 if (mtu < IPV6_MMTU) {
358 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
359 "mtu=%ld sent from %s, ignoring\n",
360 mtu, ip6_sprintf(&ip6->ip6_src)));
361 goto skip;
362 }
363
364 /* upper bound */
365 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu) ?
366 ndi->maxmtu : ifp->if_mtu;
367 if (mtu <= maxmtu) {
368 int change = (ndi->linkmtu != mtu);
369
370 ndi->linkmtu = mtu;
371 if (change) /* in6_maxmtu may change */
372 in6_setmaxmtu();
373 } else {
374 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
375 "mtu=%lu sent from %s; "
376 "exceeds maxmtu %lu, ignoring\n",
377 mtu, ip6_sprintf(&ip6->ip6_src), maxmtu));
378 }
379 }
380
381 skip:
382
383 /*
384 * Source link layer address
385 */
386 {
387 char *lladdr = NULL;
388 int lladdrlen = 0;
389
390 if (ndopts.nd_opts_src_lladdr) {
391 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
392 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
393 }
394
395 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
396 nd6log((LOG_INFO,
397 "nd6_ra_input: lladdrlen mismatch for %s "
398 "(if %d, RA packet %d)\n",
399 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
400 goto bad;
401 }
402
403 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0);
404
405 /*
406 * Installing a link-layer address might change the state of the
407 * router's neighbor cache, which might also affect our on-link
408 * detection of adveritsed prefixes.
409 */
410 pfxlist_onlink_check();
411 }
412
413 freeit:
414 m_freem(m);
415 return;
416
417 bad:
418 icmp6stat.icp6s_badra++;
419 m_freem(m);
420 }
421
422 /*
423 * default router list proccessing sub routines
424 */
425
426 #if 0
427 /* tell the change to user processes watching the routing socket. */
428 static void
429 nd6_rtmsg(int cmd, struct rtentry *rt)
430 {
431 struct rt_addrinfo info;
432
433 bzero((caddr_t)&info, sizeof(info));
434 info.rti_info[RTAX_DST] = rt_key(rt);
435 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
436 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
437 if (TAILQ_EMPTY(&rt->rt_ifp->if_addrheads[mycpuid])) {
438 info.rti_info[RTAX_IFP] = NULL;
439 } else {
440 info.rti_info[RTAX_IFP] =
441 (struct sockaddr *)
442 TAILQ_FIRST(&rt->rt_ifp->if_addrheads[mycpuid])->ifa;
443 }
444 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
445
446 rt_missmsg(cmd, &info, rt->rt_flags, 0);
447 }
448 #endif
449
450 void
defrouter_addreq(struct nd_defrouter * new)451 defrouter_addreq(struct nd_defrouter *new)
452 {
453 struct sockaddr_in6 def, mask, gate;
454
455 bzero(&def, sizeof(def));
456 bzero(&mask, sizeof(mask));
457 bzero(&gate, sizeof(gate));
458
459 def.sin6_len = mask.sin6_len = gate.sin6_len =
460 sizeof(struct sockaddr_in6);
461 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
462 gate.sin6_addr = new->rtaddr;
463
464 rtrequest_global(RTM_ADD, (struct sockaddr *)&def,
465 (struct sockaddr *)&gate, (struct sockaddr *)&mask, RTF_GATEWAY);
466 return;
467 }
468
469 /* Add a route to a given interface as default */
470 static void
defrouter_addifreq(struct ifnet * ifp)471 defrouter_addifreq(struct ifnet *ifp)
472 {
473 struct sockaddr_in6 def, mask;
474 struct ifaddr *ifa;
475 int error, flags;
476
477 bzero(&def, sizeof(def));
478 bzero(&mask, sizeof(mask));
479
480 def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6);
481 def.sin6_family = mask.sin6_family = AF_INET6;
482
483 /*
484 * Search for an ifaddr beloging to the specified interface.
485 * XXX: An IPv6 address are required to be assigned on the interface.
486 */
487 if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) {
488 nd6log((LOG_ERR, /* better error? */
489 "defrouter_addifreq: failed to find an ifaddr "
490 "to install a route to interface %s\n",
491 if_name(ifp)));
492 return;
493 }
494
495 flags = ifa->ifa_flags;
496 error = rtrequest_global(RTM_ADD, (struct sockaddr *)&def,
497 ifa->ifa_addr, (struct sockaddr *)&mask, flags);
498 if (error != 0) {
499 nd6log((LOG_ERR,
500 "defrouter_addifreq: failed to install a route to "
501 "interface %s (errno = %d)\n",
502 if_name(ifp), error));
503 }
504 }
505
506 struct nd_defrouter *
defrouter_lookup(struct in6_addr * addr,struct ifnet * ifp)507 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
508 {
509 struct nd_defrouter *dr;
510
511 for (dr = TAILQ_FIRST(&nd_defrouter); dr;
512 dr = TAILQ_NEXT(dr, dr_entry)) {
513 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
514 return (dr);
515 }
516
517 return (NULL); /* search failed */
518 }
519
520 void
defrouter_delreq(struct nd_defrouter * dr,int dofree)521 defrouter_delreq(struct nd_defrouter *dr, int dofree)
522 {
523 struct sockaddr_in6 def, mask, gate;
524
525 bzero(&def, sizeof(def));
526 bzero(&mask, sizeof(mask));
527 bzero(&gate, sizeof(gate));
528
529 def.sin6_len = mask.sin6_len = gate.sin6_len =
530 sizeof(struct sockaddr_in6);
531 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
532 gate.sin6_addr = dr->rtaddr;
533
534 rtrequest_global(RTM_DELETE, (struct sockaddr *)&def,
535 (struct sockaddr *)&gate, (struct sockaddr *)&mask, RTF_GATEWAY);
536 if (dofree) /* XXX: necessary? */
537 kfree(dr, M_IP6NDP);
538 }
539
540 void
defrtrlist_del(struct nd_defrouter * dr)541 defrtrlist_del(struct nd_defrouter *dr)
542 {
543 struct nd_defrouter *deldr = NULL;
544 struct nd_prefix *pr;
545
546 /*
547 * Flush all the routing table entries that use the router
548 * as a next hop.
549 */
550 if (!ip6_forwarding)
551 rt6_flush(&dr->rtaddr, dr->ifp);
552
553 if (dr == TAILQ_FIRST(&nd_defrouter))
554 deldr = dr; /* The router is primary. */
555
556 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
557
558 /*
559 * Also delete all the pointers to the router in each prefix lists.
560 */
561 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
562 struct nd_pfxrouter *pfxrtr;
563 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
564 pfxrtr_del(pfxrtr);
565 }
566 pfxlist_onlink_check();
567
568 /*
569 * If the router is the primary one, choose a new one.
570 * Note that defrouter_select() will remove the current gateway
571 * from the routing table.
572 */
573 if (deldr)
574 defrouter_select();
575
576 kfree(dr, M_IP6NDP);
577 }
578
579 /*
580 * Default Router Selection according to Section 6.3.6 of RFC 2461:
581 * 1) Routers that are reachable or probably reachable should be
582 * preferred.
583 * 2) When no routers on the list are known to be reachable or
584 * probably reachable, routers SHOULD be selected in a round-robin
585 * fashion.
586 * 3) If the Default Router List is empty, assume that all
587 * destinations are on-link.
588 */
589 void
defrouter_select(void)590 defrouter_select(void)
591 {
592 struct nd_defrouter *dr, anydr;
593 struct rtentry *rt = NULL;
594 struct llinfo_nd6 *ln = NULL;
595
596 mtx_lock(&nd6_mtx);
597
598 /*
599 * Search for a (probably) reachable router from the list.
600 */
601 for (dr = TAILQ_FIRST(&nd_defrouter); dr;
602 dr = TAILQ_NEXT(dr, dr_entry)) {
603 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
604 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
605 ND6_IS_LLINFO_PROBREACH(ln)) {
606 /* Got it, and move it to the head */
607 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
608 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry);
609 break;
610 }
611 }
612
613 if ((dr = TAILQ_FIRST(&nd_defrouter))) {
614 /*
615 * De-install the previous default gateway and install
616 * a new one.
617 * Note that if there is no reachable router in the list,
618 * the head entry will be used anyway.
619 * XXX: do we have to check the current routing table entry?
620 */
621 bzero(&anydr, sizeof(anydr));
622 defrouter_delreq(&anydr, 0);
623 defrouter_addreq(dr);
624 }
625 else {
626 /*
627 * The Default Router List is empty, so install the default
628 * route to an inteface.
629 * XXX: The specification does not say this mechanism should
630 * be restricted to hosts, but this would be not useful
631 * (even harmful) for routers.
632 */
633 if (!ip6_forwarding) {
634 /*
635 * De-install the current default route
636 * in advance.
637 */
638 bzero(&anydr, sizeof(anydr));
639 defrouter_delreq(&anydr, 0);
640 if (nd6_defifp) {
641 /*
642 * Install a route to the default interface
643 * as default route.
644 * XXX: we enable this for host only, because
645 * this may override a default route installed
646 * a user process (e.g. routing daemon) in a
647 * router case.
648 */
649 defrouter_addifreq(nd6_defifp);
650 } else {
651 nd6log((LOG_INFO, "defrouter_select: "
652 "there's no default router and no default"
653 " interface\n"));
654 }
655 }
656 }
657 mtx_unlock(&nd6_mtx);
658 return;
659 }
660
661 static struct nd_defrouter *
defrtrlist_update(struct nd_defrouter * new)662 defrtrlist_update(struct nd_defrouter *new)
663 {
664 struct nd_defrouter *dr, *n;
665
666 mtx_lock(&nd6_mtx);
667
668 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
669 /* entry exists */
670 if (new->rtlifetime == 0) {
671 defrtrlist_del(dr);
672 dr = NULL;
673 } else {
674 /* override */
675 dr->flags = new->flags; /* xxx flag check */
676 dr->rtlifetime = new->rtlifetime;
677 dr->expire = new->expire;
678 }
679 mtx_unlock(&nd6_mtx);
680 return (dr);
681 }
682
683 /* entry does not exist */
684 if (new->rtlifetime == 0) {
685 mtx_unlock(&nd6_mtx);
686 return (NULL);
687 }
688
689 n = (struct nd_defrouter *)kmalloc(sizeof(*n), M_IP6NDP,
690 M_NOWAIT | M_ZERO);
691 if (n == NULL) {
692 mtx_unlock(&nd6_mtx);
693 return (NULL);
694 }
695 *n = *new;
696
697 /*
698 * Insert the new router at the end of the Default Router List.
699 * If there is no other router, install it anyway. Otherwise,
700 * just continue to use the current default router.
701 */
702 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry);
703 if (TAILQ_FIRST(&nd_defrouter) == n)
704 defrouter_select();
705 mtx_unlock(&nd6_mtx);
706 return (n);
707 }
708
709 static struct nd_pfxrouter *
pfxrtr_lookup(struct nd_prefix * pr,struct nd_defrouter * dr)710 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
711 {
712 struct nd_pfxrouter *search;
713
714 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
715 if (search->router == dr)
716 break;
717 }
718
719 return (search);
720 }
721
722 static void
pfxrtr_add(struct nd_prefix * pr,struct nd_defrouter * dr)723 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
724 {
725 struct nd_pfxrouter *new;
726
727 new = kmalloc(sizeof(*new), M_IP6NDP, M_INTWAIT | M_ZERO);
728 new->router = dr;
729
730 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
731
732 pfxlist_onlink_check();
733 }
734
735 static void
pfxrtr_del(struct nd_pfxrouter * pfr)736 pfxrtr_del(struct nd_pfxrouter *pfr)
737 {
738 LIST_REMOVE(pfr, pfr_entry);
739 kfree(pfr, M_IP6NDP);
740 }
741
742 struct nd_prefix *
nd6_prefix_lookup(struct nd_prefix * pr)743 nd6_prefix_lookup(struct nd_prefix *pr)
744 {
745 struct nd_prefix *search;
746
747 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) {
748 if (pr->ndpr_ifp == search->ndpr_ifp &&
749 pr->ndpr_plen == search->ndpr_plen &&
750 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
751 &search->ndpr_prefix.sin6_addr, pr->ndpr_plen))
752 break;
753 }
754
755 return (search);
756 }
757
758 int
nd6_prelist_add(struct nd_prefix * pr,struct nd_defrouter * dr,struct nd_prefix ** newp)759 nd6_prelist_add(struct nd_prefix *pr, struct nd_defrouter *dr,
760 struct nd_prefix **newp)
761 {
762 struct nd_prefix *new = NULL;
763 int i;
764
765 new = kmalloc(sizeof(*new), M_IP6NDP, M_INTWAIT);
766 *new = *pr;
767 if (newp != NULL)
768 *newp = new;
769
770 /* initialization */
771 LIST_INIT(&new->ndpr_advrtrs);
772 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
773 /* make prefix in the canonical form */
774 for (i = 0; i < 4; i++) {
775 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
776 new->ndpr_mask.s6_addr32[i];
777 }
778
779 mtx_lock(&nd6_mtx);
780 /* link ndpr_entry to nd_prefix list */
781 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry);
782 mtx_unlock(&nd6_mtx);
783
784 /* ND_OPT_PI_FLAG_ONLINK processing */
785 if (new->ndpr_raf_onlink) {
786 int e;
787
788 if ((e = nd6_prefix_onlink(new)) != 0) {
789 nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
790 "the prefix %s/%d on-link on %s (errno=%d)\n",
791 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
792 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
793 /* proceed anyway. XXX: is it correct? */
794 }
795 }
796
797 if (dr)
798 pfxrtr_add(new, dr);
799
800 return 0;
801 }
802
803 void
prelist_remove(struct nd_prefix * pr)804 prelist_remove(struct nd_prefix *pr)
805 {
806 struct nd_pfxrouter *pfr, *next;
807 int e;
808
809 /* make sure to invalidate the prefix until it is really freed. */
810 pr->ndpr_vltime = 0;
811 pr->ndpr_pltime = 0;
812 #if 0
813 /*
814 * Though these flags are now meaningless, we'd rather keep the value
815 * not to confuse users when executing "ndp -p".
816 */
817 pr->ndpr_raf_onlink = 0;
818 pr->ndpr_raf_auto = 0;
819 #endif
820 if ((pr->ndpr_stateflags & NDPRF_ONLINK) &&
821 (e = nd6_prefix_offlink(pr)) != 0) {
822 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
823 "on %s, errno=%d\n",
824 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
825 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
826 /* what should we do? */
827 }
828
829 if (pr->ndpr_refcnt > 0)
830 return; /* notice here? */
831
832 mtx_lock(&nd6_mtx);
833
834 /* unlink ndpr_entry from nd_prefix list */
835 LIST_REMOVE(pr, ndpr_entry);
836
837 /* free list of routers that adversed the prefix */
838 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
839 next = pfr->pfr_next;
840
841 kfree(pfr, M_IP6NDP);
842 }
843 mtx_unlock(&nd6_mtx);
844
845 kfree(pr, M_IP6NDP);
846
847 pfxlist_onlink_check();
848 }
849
850 /*
851 * Parameters:
852 * dr: may be NULL
853 */
854 int
prelist_update(struct nd_prefix * new,struct nd_defrouter * dr,struct mbuf * m)855 prelist_update(struct nd_prefix *new, struct nd_defrouter *dr, struct mbuf *m)
856 {
857 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
858 struct ifaddr_container *ifac;
859 struct ifnet *ifp = new->ndpr_ifp;
860 struct nd_prefix *pr;
861 int error = 0;
862 int auth;
863 struct in6_addrlifetime lt6_tmp;
864
865 auth = 0;
866 mtx_lock(&nd6_mtx);
867 if (m) {
868 /*
869 * Authenticity for NA consists authentication for
870 * both IP header and IP datagrams, doesn't it ?
871 */
872 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
873 auth = ((m->m_flags & M_AUTHIPHDR) &&
874 (m->m_flags & M_AUTHIPDGM));
875 #endif
876 }
877
878 if ((pr = nd6_prefix_lookup(new)) != NULL) {
879 /*
880 * nd6_prefix_lookup() ensures that pr and new have the same
881 * prefix on a same interface.
882 */
883
884 /*
885 * Update prefix information. Note that the on-link (L) bit
886 * and the autonomous (A) bit should NOT be changed from 1
887 * to 0.
888 */
889 if (new->ndpr_raf_onlink == 1)
890 pr->ndpr_raf_onlink = 1;
891 if (new->ndpr_raf_auto == 1)
892 pr->ndpr_raf_auto = 1;
893 if (new->ndpr_raf_onlink) {
894 pr->ndpr_vltime = new->ndpr_vltime;
895 pr->ndpr_pltime = new->ndpr_pltime;
896 pr->ndpr_preferred = new->ndpr_preferred;
897 pr->ndpr_expire = new->ndpr_expire;
898 }
899
900 if (new->ndpr_raf_onlink &&
901 !(pr->ndpr_stateflags & NDPRF_ONLINK)) {
902 int e;
903
904 if ((e = nd6_prefix_onlink(pr)) != 0) {
905 nd6log((LOG_ERR,
906 "prelist_update: failed to make "
907 "the prefix %s/%d on-link on %s "
908 "(errno=%d)\n",
909 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
910 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
911 /* proceed anyway. XXX: is it correct? */
912 }
913 }
914
915 if (dr && pfxrtr_lookup(pr, dr) == NULL)
916 pfxrtr_add(pr, dr);
917 } else {
918 struct nd_prefix *newpr = NULL;
919
920 if (new->ndpr_vltime == 0)
921 goto end;
922 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
923 goto end;
924
925 bzero(&new->ndpr_addr, sizeof(struct in6_addr));
926
927 error = nd6_prelist_add(new, dr, &newpr);
928 if (error != 0 || newpr == NULL) {
929 nd6log((LOG_NOTICE, "prelist_update: "
930 "nd6_prelist_add failed for %s/%d on %s "
931 "errno=%d, returnpr=%p\n",
932 ip6_sprintf(&new->ndpr_prefix.sin6_addr),
933 new->ndpr_plen, if_name(new->ndpr_ifp),
934 error, newpr));
935 goto end; /* we should just give up in this case. */
936 }
937
938 /*
939 * XXX: from the ND point of view, we can ignore a prefix
940 * with the on-link bit being zero. However, we need a
941 * prefix structure for references from autoconfigured
942 * addresses. Thus, we explicitly make sure that the prefix
943 * itself expires now.
944 */
945 if (newpr->ndpr_raf_onlink == 0) {
946 newpr->ndpr_vltime = 0;
947 newpr->ndpr_pltime = 0;
948 in6_init_prefix_ltimes(newpr);
949 }
950
951 pr = newpr;
952 }
953
954 /*
955 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
956 * Note that pr must be non NULL at this point.
957 */
958
959 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
960 if (!new->ndpr_raf_auto)
961 goto afteraddrconf;
962
963 /*
964 * 5.5.3 (b). the link-local prefix should have been ignored in
965 * nd6_ra_input.
966 */
967
968 /*
969 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
970 * This should have been done in nd6_ra_input.
971 */
972
973 /*
974 * 5.5.3 (d). If the prefix advertised does not match the prefix of an
975 * address already in the list, and the Valid Lifetime is not 0,
976 * form an address. Note that even a manually configured address
977 * should reject autoconfiguration of a new address.
978 */
979 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
980 struct ifaddr *ifa = ifac->ifa;
981 struct in6_ifaddr *ifa6;
982 int ifa_plen;
983 u_int32_t storedlifetime;
984
985 if (ifa->ifa_addr->sa_family != AF_INET6)
986 continue;
987
988 ifa6 = (struct in6_ifaddr *)ifa;
989
990 /*
991 * Spec is not clear here, but I believe we should concentrate
992 * on unicast (i.e. not anycast) addresses.
993 * XXX: other ia6_flags? detached or duplicated?
994 */
995 if (ifa6->ia6_flags & IN6_IFF_ANYCAST)
996 continue;
997
998 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL);
999 if (ifa_plen != new->ndpr_plen ||
1000 !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr,
1001 &new->ndpr_prefix.sin6_addr, ifa_plen))
1002 continue;
1003
1004 if (ia6_match == NULL) /* remember the first one */
1005 ia6_match = ifa6;
1006
1007 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
1008 continue;
1009
1010 /*
1011 * An already autoconfigured address matched. Now that we
1012 * are sure there is at least one matched address, we can
1013 * proceed to 5.5.3. (e): update the lifetimes according to the
1014 * "two hours" rule and the privacy extension.
1015 */
1016 #define TWOHOUR (120*60)
1017 lt6_tmp = ifa6->ia6_lifetime;
1018
1019 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1020 storedlifetime = ND6_INFINITE_LIFETIME;
1021 else if (IFA6_IS_INVALID(ifa6))
1022 storedlifetime = 0;
1023 else
1024 storedlifetime = lt6_tmp.ia6t_expire - time_uptime;
1025
1026 /* when not updating, keep the current stored lifetime. */
1027 lt6_tmp.ia6t_vltime = storedlifetime;
1028
1029 if (TWOHOUR < new->ndpr_vltime ||
1030 storedlifetime < new->ndpr_vltime) {
1031 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1032 } else if (storedlifetime <= TWOHOUR
1033 #if 0
1034 /*
1035 * This condition is logically redundant, so we just
1036 * omit it.
1037 * See IPng 6712, 6717, and 6721.
1038 */
1039 && new->ndpr_vltime <= storedlifetime
1040 #endif
1041 ) {
1042 if (auth) {
1043 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1044 }
1045 } else {
1046 /*
1047 * new->ndpr_vltime <= TWOHOUR &&
1048 * TWOHOUR < storedlifetime
1049 */
1050 lt6_tmp.ia6t_vltime = TWOHOUR;
1051 }
1052
1053 /* The 2 hour rule is not imposed for preferred lifetime. */
1054 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1055
1056 in6_init_address_ltimes(pr, <6_tmp);
1057
1058 /*
1059 * When adjusting the lifetimes of an existing temporary
1060 * address, only lower the lifetimes.
1061 * RFC 3041 3.3. (1).
1062 * XXX: how should we modify ia6t_[pv]ltime?
1063 */
1064 if (ifa6->ia6_flags & IN6_IFF_TEMPORARY) {
1065 if (lt6_tmp.ia6t_expire == 0 || /* no expire */
1066 lt6_tmp.ia6t_expire >
1067 ifa6->ia6_lifetime.ia6t_expire) {
1068 lt6_tmp.ia6t_expire =
1069 ifa6->ia6_lifetime.ia6t_expire;
1070 }
1071 if (lt6_tmp.ia6t_preferred == 0 || /* no expire */
1072 lt6_tmp.ia6t_preferred >
1073 ifa6->ia6_lifetime.ia6t_preferred) {
1074 lt6_tmp.ia6t_preferred =
1075 ifa6->ia6_lifetime.ia6t_preferred;
1076 }
1077 }
1078
1079 ifa6->ia6_lifetime = lt6_tmp;
1080 }
1081 if (ia6_match == NULL && new->ndpr_vltime) {
1082 /*
1083 * No address matched and the valid lifetime is non-zero.
1084 * Create a new address.
1085 */
1086 if ((ia6 = in6_ifadd(new, NULL)) != NULL) {
1087 /*
1088 * note that we should use pr (not new) for reference.
1089 */
1090 pr->ndpr_refcnt++;
1091 ia6->ia6_ndpr = pr;
1092
1093 /*
1094 * RFC 3041 3.3 (2).
1095 * When a new public address is created as described
1096 * in RFC2462, also create a new temporary address.
1097 *
1098 * RFC 3041 3.5.
1099 * When an interface connects to a new link, a new
1100 * randomized interface identifier should be generated
1101 * immediately together with a new set of temporary
1102 * addresses. Thus, we specifiy 1 as the 2nd arg of
1103 * in6_tmpifadd().
1104 */
1105 if (ip6_use_tempaddr) {
1106 int e;
1107 if ((e = in6_tmpifadd(ia6, 1)) != 0) {
1108 nd6log((LOG_NOTICE, "prelist_update: "
1109 "failed to create a temporary "
1110 "address, errno=%d\n",
1111 e));
1112 }
1113 }
1114
1115 /*
1116 * A newly added address might affect the status
1117 * of other addresses, so we check and update it.
1118 * XXX: what if address duplication happens?
1119 */
1120 pfxlist_onlink_check();
1121 } else {
1122 /* just set an error. do not bark here. */
1123 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1124 }
1125 }
1126
1127 afteraddrconf:
1128
1129 end:
1130 mtx_unlock(&nd6_mtx);
1131 return error;
1132 }
1133
1134 /*
1135 * A supplement function used in the on-link detection below;
1136 * detect if a given prefix has a (probably) reachable advertising router.
1137 * XXX: lengthy function name...
1138 */
1139 static struct nd_pfxrouter *
find_pfxlist_reachable_router(struct nd_prefix * pr)1140 find_pfxlist_reachable_router(struct nd_prefix *pr)
1141 {
1142 struct nd_pfxrouter *pfxrtr;
1143 struct rtentry *rt;
1144 struct llinfo_nd6 *ln;
1145
1146 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr;
1147 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
1148 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0,
1149 pfxrtr->router->ifp)) &&
1150 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
1151 ND6_IS_LLINFO_PROBREACH(ln))
1152 break; /* found */
1153 }
1154
1155 return (pfxrtr);
1156 }
1157
1158 /*
1159 * Check if each prefix in the prefix list has at least one available router
1160 * that advertised the prefix (a router is "available" if its neighbor cache
1161 * entry is reachable or probably reachable).
1162 * If the check fails, the prefix may be off-link, because, for example,
1163 * we have moved from the network but the lifetime of the prefix has not
1164 * expired yet. So we should not use the prefix if there is another prefix
1165 * that has an available router.
1166 * But, if there is no prefix that has an available router, we still regards
1167 * all the prefixes as on-link. This is because we can't tell if all the
1168 * routers are simply dead or if we really moved from the network and there
1169 * is no router around us.
1170 */
1171 void
pfxlist_onlink_check(void)1172 pfxlist_onlink_check(void)
1173 {
1174 struct nd_prefix *pr;
1175 struct in6_ifaddr *ifa;
1176
1177 /*
1178 * Check if there is a prefix that has a reachable advertising
1179 * router.
1180 */
1181 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1182 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1183 break;
1184 }
1185
1186 if (pr) {
1187 /*
1188 * There is at least one prefix that has a reachable router.
1189 * Detach prefixes which have no reachable advertising
1190 * router, and attach other prefixes.
1191 */
1192 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1193 /* XXX: a link-local prefix should never be detached */
1194 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1195 continue;
1196
1197 /*
1198 * we aren't interested in prefixes without the L bit
1199 * set.
1200 */
1201 if (pr->ndpr_raf_onlink == 0)
1202 continue;
1203
1204 if (!(pr->ndpr_stateflags & NDPRF_DETACHED) &&
1205 find_pfxlist_reachable_router(pr) == NULL)
1206 pr->ndpr_stateflags |= NDPRF_DETACHED;
1207 if ((pr->ndpr_stateflags & NDPRF_DETACHED) &&
1208 find_pfxlist_reachable_router(pr) != NULL)
1209 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1210 }
1211 } else {
1212 /* there is no prefix that has a reachable router */
1213 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1214 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1215 continue;
1216
1217 if (pr->ndpr_raf_onlink == 0)
1218 continue;
1219
1220 if (pr->ndpr_stateflags & NDPRF_DETACHED)
1221 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1222 }
1223 }
1224
1225 /*
1226 * Remove each interface route associated with a (just) detached
1227 * prefix, and reinstall the interface route for a (just) attached
1228 * prefix. Note that all attempt of reinstallation does not
1229 * necessarily success, when a same prefix is shared among multiple
1230 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1231 * so we don't have to care about them.
1232 */
1233 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1234 int e;
1235
1236 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1237 continue;
1238
1239 if (pr->ndpr_raf_onlink == 0)
1240 continue;
1241
1242 if ((pr->ndpr_stateflags & NDPRF_DETACHED) &&
1243 (pr->ndpr_stateflags & NDPRF_ONLINK)) {
1244 if ((e = nd6_prefix_offlink(pr)) != 0) {
1245 nd6log((LOG_ERR,
1246 "pfxlist_onlink_check: failed to "
1247 "make %s/%d offlink, errno=%d\n",
1248 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1249 pr->ndpr_plen, e));
1250 }
1251 }
1252 if (!(pr->ndpr_stateflags & NDPRF_DETACHED) &&
1253 !(pr->ndpr_stateflags & NDPRF_ONLINK) &&
1254 pr->ndpr_raf_onlink) {
1255 if ((e = nd6_prefix_onlink(pr)) != 0) {
1256 nd6log((LOG_ERR,
1257 "pfxlist_onlink_check: failed to "
1258 "make %s/%d offlink, errno=%d\n",
1259 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1260 pr->ndpr_plen, e));
1261 }
1262 }
1263 }
1264
1265 /*
1266 * Changes on the prefix status might affect address status as well.
1267 * Make sure that all addresses derived from an attached prefix are
1268 * attached, and that all addresses derived from a detached prefix are
1269 * detached. Note, however, that a manually configured address should
1270 * always be attached.
1271 * The precise detection logic is same as the one for prefixes.
1272 */
1273 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1274 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1275 continue;
1276
1277 if (ifa->ia6_ndpr == NULL) {
1278 /*
1279 * This can happen when we first configure the address
1280 * (i.e. the address exists, but the prefix does not).
1281 * XXX: complicated relationships...
1282 */
1283 continue;
1284 }
1285
1286 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1287 break;
1288 }
1289 if (ifa) {
1290 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1291 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1292 continue;
1293
1294 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1295 continue;
1296
1297 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) {
1298 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1299 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1300 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1301 nd6_dad_start((struct ifaddr *)ifa, 0);
1302 }
1303 } else {
1304 if ((ifa->ia6_flags & IN6_IFF_DETACHED) == 0) {
1305 ifa->ia6_flags |= IN6_IFF_DETACHED;
1306 in6_newaddrmsg((struct ifaddr *)ifa);
1307 }
1308 }
1309 }
1310 }
1311 else {
1312 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1313 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1314 continue;
1315
1316 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1317 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1318 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1319 /* Do we need a delay in this case? */
1320 nd6_dad_start((struct ifaddr *)ifa, 0);
1321 }
1322 }
1323 }
1324 }
1325
1326 int
nd6_prefix_onlink(struct nd_prefix * pr)1327 nd6_prefix_onlink(struct nd_prefix *pr)
1328 {
1329 struct ifaddr *ifa;
1330 struct ifnet *ifp = pr->ndpr_ifp;
1331 struct sockaddr_in6 mask6;
1332 struct nd_prefix *opr;
1333 u_long rtflags;
1334 int error = 0;
1335
1336 /* sanity check */
1337 if (pr->ndpr_stateflags & NDPRF_ONLINK) {
1338 nd6log((LOG_ERR,
1339 "nd6_prefix_onlink: %s/%d is already on-link\n",
1340 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen);
1341 return (EEXIST));
1342 }
1343
1344 /*
1345 * Add the interface route associated with the prefix. Before
1346 * installing the route, check if there's the same prefix on another
1347 * interface, and the prefix has already installed the interface route.
1348 * Although such a configuration is expected to be rare, we explicitly
1349 * allow it.
1350 */
1351 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1352 if (opr == pr)
1353 continue;
1354
1355 if (!(opr->ndpr_stateflags & NDPRF_ONLINK))
1356 continue;
1357
1358 if (opr->ndpr_plen == pr->ndpr_plen &&
1359 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1360 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen))
1361 return (0);
1362 }
1363
1364 /*
1365 * We prefer link-local addresses as the associated interface address.
1366 */
1367 /* search for a link-local addr */
1368 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
1369 IN6_IFF_NOTREADY| IN6_IFF_ANYCAST);
1370 if (ifa == NULL) {
1371 struct ifaddr_container *ifac;
1372
1373 /* XXX: freebsd does not have ifa_ifwithaf */
1374 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1375 if (ifac->ifa->ifa_addr->sa_family == AF_INET6) {
1376 ifa = ifac->ifa;
1377 break;
1378 }
1379 }
1380 /* should we care about ia6_flags? */
1381 }
1382 if (ifa == NULL) {
1383 /*
1384 * This can still happen, when, for example, we receive an RA
1385 * containing a prefix with the L bit set and the A bit clear,
1386 * after removing all IPv6 addresses on the receiving
1387 * interface. This should, of course, be rare though.
1388 */
1389 nd6log((LOG_NOTICE,
1390 "nd6_prefix_onlink: failed to find any ifaddr"
1391 " to add route for a prefix(%s/%d) on %s\n",
1392 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1393 pr->ndpr_plen, if_name(ifp)));
1394 return (0);
1395 }
1396
1397 /*
1398 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1399 * ifa->ifa_rtrequest = nd6_rtrequest;
1400 */
1401 bzero(&mask6, sizeof(mask6));
1402 mask6.sin6_len = sizeof(mask6);
1403 mask6.sin6_addr = pr->ndpr_mask;
1404 rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP;
1405 if (nd6_need_cache(ifp)) {
1406 /* explicitly set in case ifa_flags does not set the flag. */
1407 rtflags |= RTF_CLONING;
1408 } else {
1409 /*
1410 * explicitly clear the cloning bit in case ifa_flags sets it.
1411 */
1412 rtflags &= ~RTF_CLONING;
1413 }
1414 error = rtrequest_global(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix,
1415 ifa->ifa_addr, (struct sockaddr *)&mask6, rtflags);
1416 if (error == 0) {
1417 pr->ndpr_stateflags |= NDPRF_ONLINK;
1418 } else {
1419 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a"
1420 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
1421 "errno = %d\n",
1422 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1423 pr->ndpr_plen, if_name(ifp),
1424 ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
1425 ip6_sprintf(&mask6.sin6_addr), rtflags, error));
1426 }
1427 return (error);
1428 }
1429
1430 int
nd6_prefix_offlink(struct nd_prefix * pr)1431 nd6_prefix_offlink(struct nd_prefix *pr)
1432 {
1433 int error = 0;
1434 struct ifnet *ifp = pr->ndpr_ifp;
1435 struct nd_prefix *opr;
1436 struct sockaddr_in6 sa6, mask6;
1437
1438 /* sanity check */
1439 if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) {
1440 nd6log((LOG_ERR,
1441 "nd6_prefix_offlink: %s/%d is already off-link\n",
1442 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen));
1443 return (EEXIST);
1444 }
1445
1446 bzero(&sa6, sizeof(sa6));
1447 sa6.sin6_family = AF_INET6;
1448 sa6.sin6_len = sizeof(sa6);
1449 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
1450 sizeof(struct in6_addr));
1451 bzero(&mask6, sizeof(mask6));
1452 mask6.sin6_family = AF_INET6;
1453 mask6.sin6_len = sizeof(sa6);
1454 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
1455 error = rtrequest_global(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
1456 (struct sockaddr *)&mask6, 0);
1457 if (error == 0) {
1458 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
1459
1460 /*
1461 * There might be the same prefix on another interface,
1462 * the prefix which could not be on-link just because we have
1463 * the interface route (see comments in nd6_prefix_onlink).
1464 * If there's one, try to make the prefix on-link on the
1465 * interface.
1466 */
1467 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1468 if (opr == pr)
1469 continue;
1470
1471 if (opr->ndpr_stateflags & NDPRF_ONLINK)
1472 continue;
1473
1474 /*
1475 * KAME specific: detached prefixes should not be
1476 * on-link.
1477 */
1478 if (opr->ndpr_stateflags & NDPRF_DETACHED)
1479 continue;
1480
1481 if (opr->ndpr_plen == pr->ndpr_plen &&
1482 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1483 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
1484 int e;
1485
1486 if ((e = nd6_prefix_onlink(opr)) != 0) {
1487 nd6log((LOG_ERR,
1488 "nd6_prefix_offlink: failed to "
1489 "recover a prefix %s/%d from %s "
1490 "to %s (errno = %d)\n",
1491 ip6_sprintf(&opr->ndpr_prefix.sin6_addr),
1492 opr->ndpr_plen, if_name(ifp),
1493 if_name(opr->ndpr_ifp), e));
1494 }
1495 }
1496 }
1497 } else {
1498 /* XXX: can we still set the NDPRF_ONLINK flag? */
1499 nd6log((LOG_ERR,
1500 "nd6_prefix_offlink: failed to delete route: "
1501 "%s/%d on %s (errno = %d)\n",
1502 ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp),
1503 error));
1504 }
1505
1506 return (error);
1507 }
1508
1509 /*
1510 * Parameters:
1511 * ifid: Mobile IPv6 addition
1512 */
1513 static struct in6_ifaddr *
in6_ifadd(struct nd_prefix * pr,struct in6_addr * ifid)1514 in6_ifadd(struct nd_prefix *pr, struct in6_addr *ifid)
1515 {
1516 struct ifnet *ifp = pr->ndpr_ifp;
1517 struct ifaddr *ifa;
1518 struct in6_aliasreq ifra;
1519 struct in6_ifaddr *ia, *ib;
1520 int error, plen0;
1521 struct in6_addr mask;
1522 int prefixlen = pr->ndpr_plen;
1523
1524 in6_prefixlen2mask(&mask, prefixlen);
1525
1526 /*
1527 * find a link-local address (will be interface ID).
1528 * Is it really mandatory? Theoretically, a global or a site-local
1529 * address can be configured without a link-local address, if we
1530 * have a unique interface identifier...
1531 *
1532 * it is not mandatory to have a link-local address, we can generate
1533 * interface identifier on the fly. we do this because:
1534 * (1) it should be the easiest way to find interface identifier.
1535 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1536 * for multiple addresses on a single interface, and possible shortcut
1537 * of DAD. we omitted DAD for this reason in the past.
1538 * (3) a user can prevent autoconfiguration of global address
1539 * by removing link-local address by hand (this is partly because we
1540 * don't have other way to control the use of IPv6 on a interface.
1541 * this has been our design choice - cf. NRL's "ifconfig auto").
1542 * (4) it is easier to manage when an interface has addresses
1543 * with the same interface identifier, than to have multiple addresses
1544 * with different interface identifiers.
1545 *
1546 * Mobile IPv6 addition: allow for caller to specify a wished interface
1547 * ID. This is to not break connections when moving addresses between
1548 * interfaces.
1549 */
1550 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
1551 if (ifa)
1552 ib = (struct in6_ifaddr *)ifa;
1553 else
1554 return NULL;
1555
1556 #if 0 /* don't care link local addr state, and always do DAD */
1557 /* if link-local address is not eligible, do not autoconfigure. */
1558 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) {
1559 kprintf("in6_ifadd: link-local address not ready\n");
1560 return NULL;
1561 }
1562 #endif
1563
1564 /* prefixlen + ifidlen must be equal to 128 */
1565 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
1566 if (prefixlen != plen0) {
1567 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
1568 "(prefix=%d ifid=%d)\n",
1569 if_name(ifp), prefixlen, 128 - plen0));
1570 return NULL;
1571 }
1572
1573 /* make ifaddr */
1574
1575 bzero(&ifra, sizeof(ifra));
1576 /*
1577 * in6_update_ifa() does not use ifra_name, but we accurately set it
1578 * for safety.
1579 */
1580 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1581 ifra.ifra_addr.sin6_family = AF_INET6;
1582 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
1583 /* prefix */
1584 bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr,
1585 sizeof(ifra.ifra_addr.sin6_addr));
1586 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
1587 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
1588 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
1589 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
1590
1591 /* interface ID */
1592 if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid))
1593 ifid = &ib->ia_addr.sin6_addr;
1594 ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
1595 (ifid->s6_addr32[0] & ~mask.s6_addr32[0]);
1596 ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
1597 (ifid->s6_addr32[1] & ~mask.s6_addr32[1]);
1598 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
1599 (ifid->s6_addr32[2] & ~mask.s6_addr32[2]);
1600 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
1601 (ifid->s6_addr32[3] & ~mask.s6_addr32[3]);
1602
1603 /* new prefix mask. */
1604 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1605 ifra.ifra_prefixmask.sin6_family = AF_INET6;
1606 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
1607 sizeof(ifra.ifra_prefixmask.sin6_addr));
1608
1609 /*
1610 * lifetime.
1611 * XXX: in6_init_address_ltimes would override these values later.
1612 * We should reconsider this logic.
1613 */
1614 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
1615 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
1616
1617 /* XXX: scope zone ID? */
1618
1619 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
1620 /*
1621 * temporarily set the nopfx flag to avoid conflict.
1622 * XXX: we should reconsider the entire mechanism about prefix
1623 * manipulation.
1624 */
1625 ifra.ifra_flags |= IN6_IFF_NOPFX;
1626
1627 /*
1628 * keep the new address, regardless of the result of in6_update_ifa.
1629 * XXX: this address is now meaningless.
1630 * We should reconsider its role.
1631 */
1632 pr->ndpr_addr = ifra.ifra_addr.sin6_addr;
1633
1634 /* allocate ifaddr structure, link into chain, etc. */
1635 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
1636 nd6log((LOG_ERR,
1637 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
1638 ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp),
1639 error));
1640 return (NULL); /* ifaddr must not have been allocated. */
1641 }
1642
1643 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1644
1645 return (ia); /* this is always non-NULL */
1646 }
1647
1648 /*
1649 * Parameters:
1650 * ia0: corresponding public address
1651 */
1652 int
in6_tmpifadd(const struct in6_ifaddr * ia0,int forcegen)1653 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen)
1654 {
1655 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
1656 struct in6_ifaddr *newia;
1657 struct in6_aliasreq ifra;
1658 int i, error;
1659 int trylimit = 3; /* XXX: adhoc value */
1660 u_int32_t randid[2];
1661 time_t vltime0, pltime0;
1662
1663 bzero(&ifra, sizeof(ifra));
1664 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1665 ifra.ifra_addr = ia0->ia_addr;
1666 /* copy prefix mask */
1667 ifra.ifra_prefixmask = ia0->ia_prefixmask;
1668 /* clear the old IFID */
1669 for (i = 0; i < 4; i++) {
1670 ifra.ifra_addr.sin6_addr.s6_addr32[i] &=
1671 ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
1672 }
1673
1674 again:
1675 in6_get_tmpifid(ifp, (u_int8_t *)randid,
1676 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen);
1677 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
1678 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
1679 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
1680 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
1681
1682 /*
1683 * If by chance the new temporary address is the same as an address
1684 * already assigned to the interface, generate a new randomized
1685 * interface identifier and repeat this step.
1686 * RFC 3041 3.3 (4).
1687 */
1688 if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) {
1689 if (trylimit-- == 0) {
1690 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find "
1691 "a unique random IFID\n"));
1692 return (EEXIST);
1693 }
1694 forcegen = 1;
1695 goto again;
1696 }
1697
1698 /*
1699 * The Valid Lifetime is the lower of the Valid Lifetime of the
1700 * public address or TEMP_VALID_LIFETIME.
1701 * The Preferred Lifetime is the lower of the Preferred Lifetime
1702 * of the public address or TEMP_PREFERRED_LIFETIME -
1703 * DESYNC_FACTOR.
1704 */
1705 if (ia0->ia6_lifetime.ia6t_expire != 0) {
1706 vltime0 = IFA6_IS_INVALID(ia0) ?
1707 0 : (ia0->ia6_lifetime.ia6t_expire - time_uptime);
1708 if (vltime0 > ip6_temp_valid_lifetime)
1709 vltime0 = ip6_temp_valid_lifetime;
1710 } else
1711 vltime0 = ip6_temp_valid_lifetime;
1712 if (ia0->ia6_lifetime.ia6t_preferred != 0) {
1713 pltime0 = IFA6_IS_DEPRECATED(ia0) ?
1714 0 : (ia0->ia6_lifetime.ia6t_preferred - time_uptime);
1715 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor) {
1716 pltime0 = ip6_temp_preferred_lifetime -
1717 ip6_desync_factor;
1718 }
1719 } else
1720 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor;
1721 ifra.ifra_lifetime.ia6t_vltime = vltime0;
1722 ifra.ifra_lifetime.ia6t_pltime = pltime0;
1723
1724 /*
1725 * A temporary address is created only if this calculated Preferred
1726 * Lifetime is greater than REGEN_ADVANCE time units.
1727 */
1728 if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance)
1729 return (0);
1730
1731 /* XXX: scope zone ID? */
1732
1733 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
1734
1735 /* allocate ifaddr structure, link into chain, etc. */
1736 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0)
1737 return (error);
1738
1739 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1740 if (newia == NULL) { /* XXX: can it happen? */
1741 nd6log((LOG_ERR,
1742 "in6_tmpifadd: ifa update succeeded, but we got "
1743 "no ifaddr\n"));
1744 return (EINVAL); /* XXX */
1745 }
1746 newia->ia6_ndpr = ia0->ia6_ndpr;
1747 newia->ia6_ndpr->ndpr_refcnt++;
1748
1749 return (0);
1750 }
1751
1752 int
in6_init_prefix_ltimes(struct nd_prefix * ndpr)1753 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
1754 {
1755 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */
1756 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) {
1757 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime"
1758 "(%d) is greater than valid lifetime(%d)\n",
1759 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime));
1760 return (EINVAL);
1761 }
1762 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
1763 ndpr->ndpr_preferred = 0;
1764 else
1765 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime;
1766 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
1767 ndpr->ndpr_expire = 0;
1768 else
1769 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime;
1770
1771 return 0;
1772 }
1773
1774 static void
in6_init_address_ltimes(struct nd_prefix * new,struct in6_addrlifetime * lt6)1775 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
1776 {
1777 /* init ia6t_expire */
1778 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
1779 lt6->ia6t_expire = 0;
1780 else {
1781 lt6->ia6t_expire = time_uptime;
1782 lt6->ia6t_expire += lt6->ia6t_vltime;
1783 }
1784
1785 /* init ia6t_preferred */
1786 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
1787 lt6->ia6t_preferred = 0;
1788 else {
1789 lt6->ia6t_preferred = time_uptime;
1790 lt6->ia6t_preferred += lt6->ia6t_pltime;
1791 }
1792 }
1793
1794 /*
1795 * Delete all the routing table entries that use the specified gateway.
1796 *
1797 * XXX: this function causes search through all entries of routing table, so
1798 * it shouldn't be called when acting as a router.
1799 */
1800 void
rt6_flush(struct in6_addr * gateway,struct ifnet * ifp)1801 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
1802 {
1803 struct radix_node_head *rnh = rt_tables[mycpuid][AF_INET6];
1804
1805 /* We'll care only link-local addresses */
1806 if (!IN6_IS_ADDR_LINKLOCAL(gateway))
1807 return;
1808 /* XXX: hack for KAME's link-local address kludge */
1809 gateway->s6_addr16[1] = htons(ifp->if_index);
1810
1811 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
1812 }
1813
1814 static int
rt6_deleteroute(struct radix_node * rn,void * arg)1815 rt6_deleteroute(struct radix_node *rn, void *arg)
1816 {
1817 #define SIN6(s) ((struct sockaddr_in6 *)s)
1818 struct rtentry *rt = (struct rtentry *)rn;
1819 struct in6_addr *gate = (struct in6_addr *)arg;
1820
1821 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
1822 return (0);
1823
1824 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr))
1825 return (0);
1826
1827 /*
1828 * Do not delete a static route.
1829 * XXX: this seems to be a bit ad-hoc. Should we consider the
1830 * 'cloned' bit instead?
1831 */
1832 if (rt->rt_flags & RTF_STATIC)
1833 return (0);
1834
1835 /*
1836 * We delete only host route. This means, in particular, we don't
1837 * delete default route.
1838 */
1839 if (!(rt->rt_flags & RTF_HOST))
1840 return (0);
1841
1842 return (rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, rt_mask(rt),
1843 rt->rt_flags, 0));
1844 #undef SIN6
1845 }
1846
1847 int
nd6_setdefaultiface(int ifindex)1848 nd6_setdefaultiface(int ifindex)
1849 {
1850 int error = 0;
1851
1852 if (ifindex < 0 || if_index < ifindex)
1853 return (EINVAL);
1854
1855 if (nd6_defifindex != ifindex) {
1856 nd6_defifindex = ifindex;
1857 if (nd6_defifindex > 0)
1858 nd6_defifp = ifindex2ifnet[nd6_defifindex];
1859 else
1860 nd6_defifp = NULL;
1861
1862 /*
1863 * If the Default Router List is empty, install a route
1864 * to the specified interface as default or remove the default
1865 * route when the default interface becomes canceled.
1866 * The check for the queue is actually redundant, but
1867 * we do this here to avoid re-install the default route
1868 * if the list is NOT empty.
1869 */
1870 if (TAILQ_FIRST(&nd_defrouter) == NULL)
1871 defrouter_select();
1872
1873 /*
1874 * Our current implementation assumes one-to-one maping between
1875 * interfaces and links, so it would be natural to use the
1876 * default interface as the default link.
1877 */
1878 scope6_setdefault(nd6_defifp);
1879 }
1880
1881 return (error);
1882 }
1883