Clean up routing code before I parallelize it.
[dragonfly.git] / sys / netinet6 / nd6_rtr.c
CommitLineData
984263bc 1/* $FreeBSD: src/sys/netinet6/nd6_rtr.c,v 1.2.2.5 2003/04/05 10:28:53 ume Exp $ */
2e9572df 2/* $DragonFly: src/sys/netinet6/nd6_rtr.c,v 1.5 2004/12/14 18:46:08 hsu Exp $ */
984263bc
MD
3/* $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $ */
4
5/*
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "opt_inet.h"
35#include "opt_inet6.h"
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/malloc.h>
40#include <sys/mbuf.h>
41#include <sys/socket.h>
42#include <sys/sockio.h>
43#include <sys/time.h>
44#include <sys/kernel.h>
45#include <sys/errno.h>
46#include <sys/syslog.h>
47#include <sys/queue.h>
48
49#include <net/if.h>
50#include <net/if_types.h>
51#include <net/if_dl.h>
52#include <net/route.h>
53#include <net/radix.h>
54
55#include <netinet/in.h>
56#include <netinet6/in6_var.h>
57#include <netinet6/in6_ifattach.h>
58#include <netinet/ip6.h>
59#include <netinet6/ip6_var.h>
60#include <netinet6/nd6.h>
61#include <netinet/icmp6.h>
62#include <netinet6/scope6_var.h>
63
64#include <net/net_osdep.h>
65
66#define SDL(s) ((struct sockaddr_dl *)s)
67
56d702cc
RG
68static struct nd_defrouter *defrtrlist_update (struct nd_defrouter *);
69static struct in6_ifaddr *in6_ifadd (struct nd_prefix *,
70 struct in6_addr *);
71static struct nd_pfxrouter *pfxrtr_lookup (struct nd_prefix *,
72 struct nd_defrouter *);
73static void pfxrtr_add (struct nd_prefix *, struct nd_defrouter *);
74static void pfxrtr_del (struct nd_pfxrouter *);
984263bc 75static struct nd_pfxrouter *find_pfxlist_reachable_router
56d702cc
RG
76 (struct nd_prefix *);
77static void defrouter_addifreq (struct ifnet *);
78static void nd6_rtmsg (int, struct rtentry *);
984263bc 79
56d702cc
RG
80static void in6_init_address_ltimes (struct nd_prefix *ndpr,
81 struct in6_addrlifetime *lt6);
984263bc 82
56d702cc 83static int rt6_deleteroute (struct radix_node *, void *);
984263bc
MD
84
85extern int nd6_recalc_reachtm_interval;
86
87static struct ifnet *nd6_defifp;
88int nd6_defifindex;
89
90int ip6_use_tempaddr = 0;
91
92int ip6_desync_factor;
93u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME;
94u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME;
95/*
96 * shorter lifetimes for debugging purposes.
97int ip6_temp_preferred_lifetime = 800;
98static int ip6_temp_valid_lifetime = 1800;
99*/
100int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE;
101
102/*
103 * Receive Router Solicitation Message - just for routers.
104 * Router solicitation/advertisement is mostly managed by userland program
105 * (rtadvd) so here we have no function like nd6_ra_output().
106 *
107 * Based on RFC 2461
108 */
109void
110nd6_rs_input(m, off, icmp6len)
111 struct mbuf *m;
112 int off, 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#if 0
119 struct in6_addr daddr6 = ip6->ip6_dst;
120#endif
121 char *lladdr = NULL;
122 int lladdrlen = 0;
123#if 0
124 struct sockaddr_dl *sdl = (struct sockaddr_dl *)NULL;
125 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL;
126 struct rtentry *rt = NULL;
127 int is_newentry;
128#endif
129 union nd_opts ndopts;
130
131 /* If I'm not a router, ignore it. */
132 if (ip6_accept_rtadv != 0 || ip6_forwarding != 1)
133 goto freeit;
134
135 /* Sanity checks */
136 if (ip6->ip6_hlim != 255) {
137 nd6log((LOG_ERR,
138 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
139 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
140 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
141 goto bad;
142 }
143
144 /*
145 * Don't update the neighbor cache, if src = ::.
146 * This indicates that the src has no IP address assigned yet.
147 */
148 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
149 goto freeit;
150
151#ifndef PULLDOWN_TEST
152 IP6_EXTHDR_CHECK(m, off, icmp6len,);
153 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
154#else
155 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
156 if (nd_rs == NULL) {
157 icmp6stat.icp6s_tooshort++;
158 return;
159 }
160#endif
161
162 icmp6len -= sizeof(*nd_rs);
163 nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
164 if (nd6_options(&ndopts) < 0) {
165 nd6log((LOG_INFO,
166 "nd6_rs_input: invalid ND option, ignored\n"));
167 /* nd6_options have incremented stats */
168 goto freeit;
169 }
170
171 if (ndopts.nd_opts_src_lladdr) {
172 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
173 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
174 }
175
176 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
177 nd6log((LOG_INFO,
178 "nd6_rs_input: lladdrlen mismatch for %s "
179 "(if %d, RS packet %d)\n",
180 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
181 goto bad;
182 }
183
184 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
185
186 freeit:
187 m_freem(m);
188 return;
189
190 bad:
191 icmp6stat.icp6s_badrs++;
192 m_freem(m);
193}
194
195/*
196 * Receive Router Advertisement Message.
197 *
198 * Based on RFC 2461
199 * TODO: on-link bit on prefix information
200 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
201 */
202void
203nd6_ra_input(m, off, icmp6len)
204 struct mbuf *m;
205 int off, icmp6len;
206{
207 struct ifnet *ifp = m->m_pkthdr.rcvif;
208 struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index];
209 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
210 struct nd_router_advert *nd_ra;
211 struct in6_addr saddr6 = ip6->ip6_src;
212#if 0
213 struct in6_addr daddr6 = ip6->ip6_dst;
214 int flags; /* = nd_ra->nd_ra_flags_reserved; */
215 int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0);
216 int is_other = ((flags & ND_RA_FLAG_OTHER) != 0);
217#endif
218 union nd_opts ndopts;
219 struct nd_defrouter *dr;
220
221 if (ip6_accept_rtadv == 0)
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_second + 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) {
3c81cebc 273 advreachable = ntohl(advreachable);
984263bc
MD
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 /* aggregatable unicast address, rfc2374 */
330 if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20
331 && pi->nd_opt_pi_prefix_len != 64) {
332 nd6log((LOG_INFO,
333 "nd6_ra_input: invalid prefixlen "
334 "%d for rfc2374 prefix %s, ignored\n",
335 pi->nd_opt_pi_prefix_len,
336 ip6_sprintf(&pi->nd_opt_pi_prefix)));
337 continue;
338 }
339
340 bzero(&pr, sizeof(pr));
341 pr.ndpr_prefix.sin6_family = AF_INET6;
342 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
343 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
344 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
345
346 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
347 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
348 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
349 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
350 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
351 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
352 pr.ndpr_pltime =
353 ntohl(pi->nd_opt_pi_preferred_time);
354
355 if (in6_init_prefix_ltimes(&pr))
356 continue; /* prefix lifetime init failed */
357
358 (void)prelist_update(&pr, dr, m);
359 }
360 }
361
362 /*
363 * MTU
364 */
365 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
366 u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
367
368 /* lower bound */
369 if (mtu < IPV6_MMTU) {
370 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
371 "mtu=%d sent from %s, ignoring\n",
372 mtu, ip6_sprintf(&ip6->ip6_src)));
373 goto skip;
374 }
375
376 /* upper bound */
377 if (ndi->maxmtu) {
378 if (mtu <= ndi->maxmtu) {
379 int change = (ndi->linkmtu != mtu);
380
381 ndi->linkmtu = mtu;
382 if (change) /* in6_maxmtu may change */
383 in6_setmaxmtu();
384 } else {
385 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
386 "mtu=%d sent from %s; "
387 "exceeds maxmtu %d, ignoring\n",
388 mtu, ip6_sprintf(&ip6->ip6_src),
389 ndi->maxmtu));
390 }
391 } else {
392 nd6log((LOG_INFO, "nd6_ra_input: mtu option "
393 "mtu=%d sent from %s; maxmtu unknown, "
394 "ignoring\n",
395 mtu, ip6_sprintf(&ip6->ip6_src)));
396 }
397 }
398
399 skip:
400
401 /*
402 * Source link layer address
403 */
404 {
405 char *lladdr = NULL;
406 int lladdrlen = 0;
407
408 if (ndopts.nd_opts_src_lladdr) {
409 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
410 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
411 }
412
413 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
414 nd6log((LOG_INFO,
415 "nd6_ra_input: lladdrlen mismatch for %s "
416 "(if %d, RA packet %d)\n",
417 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
418 goto bad;
419 }
420
421 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0);
422
423 /*
424 * Installing a link-layer address might change the state of the
425 * router's neighbor cache, which might also affect our on-link
426 * detection of adveritsed prefixes.
427 */
428 pfxlist_onlink_check();
429 }
430
431 freeit:
432 m_freem(m);
433 return;
434
435 bad:
436 icmp6stat.icp6s_badra++;
437 m_freem(m);
438}
439
440/*
441 * default router list proccessing sub routines
442 */
443
444/* tell the change to user processes watching the routing socket. */
445static void
446nd6_rtmsg(cmd, rt)
447 int cmd;
448 struct rtentry *rt;
449{
450 struct rt_addrinfo info;
451
452 bzero((caddr_t)&info, sizeof(info));
453 info.rti_info[RTAX_DST] = rt_key(rt);
454 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
455 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
456 info.rti_info[RTAX_IFP] =
457 (struct sockaddr *)TAILQ_FIRST(&rt->rt_ifp->if_addrlist);
458 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
459
460 rt_missmsg(cmd, &info, rt->rt_flags, 0);
461}
462
463void
464defrouter_addreq(new)
465 struct nd_defrouter *new;
466{
467 struct sockaddr_in6 def, mask, gate;
468 struct rtentry *newrt = NULL;
469 int s;
470
2e9572df
JH
471 bzero(&def, sizeof(def));
472 bzero(&mask, sizeof(mask));
473 bzero(&gate, sizeof(gate));
984263bc
MD
474
475 def.sin6_len = mask.sin6_len = gate.sin6_len
476 = sizeof(struct sockaddr_in6);
477 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
478 gate.sin6_addr = new->rtaddr;
479
480 s = splnet();
481 (void)rtrequest(RTM_ADD, (struct sockaddr *)&def,
482 (struct sockaddr *)&gate, (struct sockaddr *)&mask,
483 RTF_GATEWAY, &newrt);
484 if (newrt) {
485 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
486 newrt->rt_refcnt--;
487 }
488 splx(s);
489 return;
490}
491
492/* Add a route to a given interface as default */
493void
494defrouter_addifreq(ifp)
495 struct ifnet *ifp;
496{
497 struct sockaddr_in6 def, mask;
498 struct ifaddr *ifa;
499 struct rtentry *newrt = NULL;
500 int error, flags;
501
502 bzero(&def, sizeof(def));
503 bzero(&mask, sizeof(mask));
504
505 def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6);
506 def.sin6_family = mask.sin6_family = AF_INET6;
507
508 /*
509 * Search for an ifaddr beloging to the specified interface.
510 * XXX: An IPv6 address are required to be assigned on the interface.
511 */
512 if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) {
513 nd6log((LOG_ERR, /* better error? */
514 "defrouter_addifreq: failed to find an ifaddr "
515 "to install a route to interface %s\n",
516 if_name(ifp)));
517 return;
518 }
519
520 flags = ifa->ifa_flags;
521 error = rtrequest(RTM_ADD, (struct sockaddr *)&def, ifa->ifa_addr,
522 (struct sockaddr *)&mask, flags, &newrt);
523 if (error != 0) {
524 nd6log((LOG_ERR,
525 "defrouter_addifreq: failed to install a route to "
526 "interface %s (errno = %d)\n",
527 if_name(ifp), error));
528
529 if (newrt) /* maybe unnecessary, but do it for safety */
530 newrt->rt_refcnt--;
531 } else {
532 if (newrt) {
533 nd6_rtmsg(RTM_ADD, newrt);
534 newrt->rt_refcnt--;
535 }
536 }
537}
538
539struct nd_defrouter *
540defrouter_lookup(addr, ifp)
541 struct in6_addr *addr;
542 struct ifnet *ifp;
543{
544 struct nd_defrouter *dr;
545
546 for (dr = TAILQ_FIRST(&nd_defrouter); dr;
547 dr = TAILQ_NEXT(dr, dr_entry)) {
548 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
549 return(dr);
550 }
551
552 return(NULL); /* search failed */
553}
554
555void
556defrouter_delreq(dr, dofree)
557 struct nd_defrouter *dr;
558 int dofree;
559{
560 struct sockaddr_in6 def, mask, gate;
561 struct rtentry *oldrt = NULL;
562
2e9572df
JH
563 bzero(&def, sizeof(def));
564 bzero(&mask, sizeof(mask));
565 bzero(&gate, sizeof(gate));
984263bc
MD
566
567 def.sin6_len = mask.sin6_len = gate.sin6_len
568 = sizeof(struct sockaddr_in6);
569 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
570 gate.sin6_addr = dr->rtaddr;
571
572 rtrequest(RTM_DELETE, (struct sockaddr *)&def,
573 (struct sockaddr *)&gate,
574 (struct sockaddr *)&mask,
575 RTF_GATEWAY, &oldrt);
576 if (oldrt) {
577 nd6_rtmsg(RTM_DELETE, oldrt);
578 if (oldrt->rt_refcnt <= 0) {
579 /*
580 * XXX: borrowed from the RTM_DELETE case of
581 * rtrequest().
582 */
583 oldrt->rt_refcnt++;
584 rtfree(oldrt);
585 }
586 }
587
588 if (dofree) /* XXX: necessary? */
589 free(dr, M_IP6NDP);
590}
591
592void
593defrtrlist_del(dr)
594 struct nd_defrouter *dr;
595{
596 struct nd_defrouter *deldr = NULL;
597 struct nd_prefix *pr;
598
599 /*
600 * Flush all the routing table entries that use the router
601 * as a next hop.
602 */
603 if (!ip6_forwarding && ip6_accept_rtadv) {
604 /* above is a good condition? */
605 rt6_flush(&dr->rtaddr, dr->ifp);
606 }
607
608 if (dr == TAILQ_FIRST(&nd_defrouter))
609 deldr = dr; /* The router is primary. */
610
611 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
612
613 /*
614 * Also delete all the pointers to the router in each prefix lists.
615 */
616 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
617 struct nd_pfxrouter *pfxrtr;
618 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
619 pfxrtr_del(pfxrtr);
620 }
621 pfxlist_onlink_check();
622
623 /*
624 * If the router is the primary one, choose a new one.
625 * Note that defrouter_select() will remove the current gateway
626 * from the routing table.
627 */
628 if (deldr)
629 defrouter_select();
630
631 free(dr, M_IP6NDP);
632}
633
634/*
635 * Default Router Selection according to Section 6.3.6 of RFC 2461:
636 * 1) Routers that are reachable or probably reachable should be
637 * preferred.
638 * 2) When no routers on the list are known to be reachable or
639 * probably reachable, routers SHOULD be selected in a round-robin
640 * fashion.
641 * 3) If the Default Router List is empty, assume that all
642 * destinations are on-link.
643 */
644void
645defrouter_select()
646{
647 int s = splnet();
648 struct nd_defrouter *dr, anydr;
649 struct rtentry *rt = NULL;
650 struct llinfo_nd6 *ln = NULL;
651
652 /*
653 * Search for a (probably) reachable router from the list.
654 */
655 for (dr = TAILQ_FIRST(&nd_defrouter); dr;
656 dr = TAILQ_NEXT(dr, dr_entry)) {
657 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
658 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
659 ND6_IS_LLINFO_PROBREACH(ln)) {
660 /* Got it, and move it to the head */
661 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
662 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry);
663 break;
664 }
665 }
666
667 if ((dr = TAILQ_FIRST(&nd_defrouter))) {
668 /*
669 * De-install the previous default gateway and install
670 * a new one.
671 * Note that if there is no reachable router in the list,
672 * the head entry will be used anyway.
673 * XXX: do we have to check the current routing table entry?
674 */
675 bzero(&anydr, sizeof(anydr));
676 defrouter_delreq(&anydr, 0);
677 defrouter_addreq(dr);
678 }
679 else {
680 /*
681 * The Default Router List is empty, so install the default
682 * route to an inteface.
683 * XXX: The specification does not say this mechanism should
684 * be restricted to hosts, but this would be not useful
685 * (even harmful) for routers.
686 */
687 if (!ip6_forwarding) {
688 /*
689 * De-install the current default route
690 * in advance.
691 */
692 bzero(&anydr, sizeof(anydr));
693 defrouter_delreq(&anydr, 0);
694 if (nd6_defifp) {
695 /*
696 * Install a route to the default interface
697 * as default route.
698 * XXX: we enable this for host only, because
699 * this may override a default route installed
700 * a user process (e.g. routing daemon) in a
701 * router case.
702 */
703 defrouter_addifreq(nd6_defifp);
704 } else {
705 nd6log((LOG_INFO, "defrouter_select: "
706 "there's no default router and no default"
707 " interface\n"));
708 }
709 }
710 }
711
712 splx(s);
713 return;
714}
715
716static struct nd_defrouter *
717defrtrlist_update(new)
718 struct nd_defrouter *new;
719{
720 struct nd_defrouter *dr, *n;
721 int s = splnet();
722
723 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
724 /* entry exists */
725 if (new->rtlifetime == 0) {
726 defrtrlist_del(dr);
727 dr = NULL;
728 } else {
729 /* override */
730 dr->flags = new->flags; /* xxx flag check */
731 dr->rtlifetime = new->rtlifetime;
732 dr->expire = new->expire;
733 }
734 splx(s);
735 return(dr);
736 }
737
738 /* entry does not exist */
739 if (new->rtlifetime == 0) {
740 splx(s);
741 return(NULL);
742 }
743
744 n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
745 if (n == NULL) {
746 splx(s);
747 return(NULL);
748 }
749 bzero(n, sizeof(*n));
750 *n = *new;
751
752 /*
753 * Insert the new router at the end of the Default Router List.
754 * If there is no other router, install it anyway. Otherwise,
755 * just continue to use the current default router.
756 */
757 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry);
758 if (TAILQ_FIRST(&nd_defrouter) == n)
759 defrouter_select();
760 splx(s);
761
762 return(n);
763}
764
765static struct nd_pfxrouter *
766pfxrtr_lookup(pr, dr)
767 struct nd_prefix *pr;
768 struct nd_defrouter *dr;
769{
770 struct nd_pfxrouter *search;
771
772 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
773 if (search->router == dr)
774 break;
775 }
776
777 return(search);
778}
779
780static void
781pfxrtr_add(pr, dr)
782 struct nd_prefix *pr;
783 struct nd_defrouter *dr;
784{
785 struct nd_pfxrouter *new;
786
787 new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
788 if (new == NULL)
789 return;
790 bzero(new, sizeof(*new));
791 new->router = dr;
792
793 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
794
795 pfxlist_onlink_check();
796}
797
798static void
799pfxrtr_del(pfr)
800 struct nd_pfxrouter *pfr;
801{
802 LIST_REMOVE(pfr, pfr_entry);
803 free(pfr, M_IP6NDP);
804}
805
806struct nd_prefix *
807nd6_prefix_lookup(pr)
808 struct nd_prefix *pr;
809{
810 struct nd_prefix *search;
811
812 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) {
813 if (pr->ndpr_ifp == search->ndpr_ifp &&
814 pr->ndpr_plen == search->ndpr_plen &&
815 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
816 &search->ndpr_prefix.sin6_addr,
817 pr->ndpr_plen)
818 ) {
819 break;
820 }
821 }
822
823 return(search);
824}
825
826int
827nd6_prelist_add(pr, dr, newp)
828 struct nd_prefix *pr, **newp;
829 struct nd_defrouter *dr;
830{
831 struct nd_prefix *new = NULL;
832 int i, s;
833
834 new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
835 if (new == NULL)
836 return ENOMEM;
837 bzero(new, sizeof(*new));
838 *new = *pr;
839 if (newp != NULL)
840 *newp = new;
841
842 /* initilization */
843 LIST_INIT(&new->ndpr_advrtrs);
844 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
845 /* make prefix in the canonical form */
846 for (i = 0; i < 4; i++)
847 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
848 new->ndpr_mask.s6_addr32[i];
849
850 s = splnet();
851 /* link ndpr_entry to nd_prefix list */
852 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry);
853 splx(s);
854
855 /* ND_OPT_PI_FLAG_ONLINK processing */
856 if (new->ndpr_raf_onlink) {
857 int e;
858
859 if ((e = nd6_prefix_onlink(new)) != 0) {
860 nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
861 "the prefix %s/%d on-link on %s (errno=%d)\n",
862 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
863 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
864 /* proceed anyway. XXX: is it correct? */
865 }
866 }
867
868 if (dr) {
869 pfxrtr_add(new, dr);
870 }
871
872 return 0;
873}
874
875void
876prelist_remove(pr)
877 struct nd_prefix *pr;
878{
879 struct nd_pfxrouter *pfr, *next;
880 int e, s;
881
882 /* make sure to invalidate the prefix until it is really freed. */
883 pr->ndpr_vltime = 0;
884 pr->ndpr_pltime = 0;
885#if 0
886 /*
887 * Though these flags are now meaningless, we'd rather keep the value
888 * not to confuse users when executing "ndp -p".
889 */
890 pr->ndpr_raf_onlink = 0;
891 pr->ndpr_raf_auto = 0;
892#endif
893 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
894 (e = nd6_prefix_offlink(pr)) != 0) {
895 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
896 "on %s, errno=%d\n",
897 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
898 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
899 /* what should we do? */
900 }
901
902 if (pr->ndpr_refcnt > 0)
903 return; /* notice here? */
904
905 s = splnet();
906
907 /* unlink ndpr_entry from nd_prefix list */
908 LIST_REMOVE(pr, ndpr_entry);
909
910 /* free list of routers that adversed the prefix */
911 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
912 next = pfr->pfr_next;
913
914 free(pfr, M_IP6NDP);
915 }
916 splx(s);
917
918 free(pr, M_IP6NDP);
919
920 pfxlist_onlink_check();
921}
922
923int
924prelist_update(new, dr, m)
925 struct nd_prefix *new;
926 struct nd_defrouter *dr; /* may be NULL */
927 struct mbuf *m;
928{
929 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
930 struct ifaddr *ifa;
931 struct ifnet *ifp = new->ndpr_ifp;
932 struct nd_prefix *pr;
933 int s = splnet();
934 int error = 0;
935 int newprefix = 0;
936 int auth;
937 struct in6_addrlifetime lt6_tmp;
938
939 auth = 0;
940 if (m) {
941 /*
942 * Authenticity for NA consists authentication for
943 * both IP header and IP datagrams, doesn't it ?
944 */
945#if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
946 auth = (m->m_flags & M_AUTHIPHDR
947 && m->m_flags & M_AUTHIPDGM) ? 1 : 0;
948#endif
949 }
950
951
952 if ((pr = nd6_prefix_lookup(new)) != NULL) {
953 /*
954 * nd6_prefix_lookup() ensures that pr and new have the same
955 * prefix on a same interface.
956 */
957
958 /*
959 * Update prefix information. Note that the on-link (L) bit
960 * and the autonomous (A) bit should NOT be changed from 1
961 * to 0.
962 */
963 if (new->ndpr_raf_onlink == 1)
964 pr->ndpr_raf_onlink = 1;
965 if (new->ndpr_raf_auto == 1)
966 pr->ndpr_raf_auto = 1;
967 if (new->ndpr_raf_onlink) {
968 pr->ndpr_vltime = new->ndpr_vltime;
969 pr->ndpr_pltime = new->ndpr_pltime;
970 pr->ndpr_preferred = new->ndpr_preferred;
971 pr->ndpr_expire = new->ndpr_expire;
972 }
973
974 if (new->ndpr_raf_onlink &&
975 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
976 int e;
977
978 if ((e = nd6_prefix_onlink(pr)) != 0) {
979 nd6log((LOG_ERR,
980 "prelist_update: failed to make "
981 "the prefix %s/%d on-link on %s "
982 "(errno=%d)\n",
983 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
984 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
985 /* proceed anyway. XXX: is it correct? */
986 }
987 }
988
989 if (dr && pfxrtr_lookup(pr, dr) == NULL)
990 pfxrtr_add(pr, dr);
991 } else {
992 struct nd_prefix *newpr = NULL;
993
994 newprefix = 1;
995
996 if (new->ndpr_vltime == 0)
997 goto end;
998 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
999 goto end;
1000
1001 bzero(&new->ndpr_addr, sizeof(struct in6_addr));
1002
1003 error = nd6_prelist_add(new, dr, &newpr);
1004 if (error != 0 || newpr == NULL) {
1005 nd6log((LOG_NOTICE, "prelist_update: "
1006 "nd6_prelist_add failed for %s/%d on %s "
1007 "errno=%d, returnpr=%p\n",
1008 ip6_sprintf(&new->ndpr_prefix.sin6_addr),
1009 new->ndpr_plen, if_name(new->ndpr_ifp),
1010 error, newpr));
1011 goto end; /* we should just give up in this case. */
1012 }
1013
1014 /*
1015 * XXX: from the ND point of view, we can ignore a prefix
1016 * with the on-link bit being zero. However, we need a
1017 * prefix structure for references from autoconfigured
1018 * addresses. Thus, we explicitly make suret that the prefix
1019 * itself expires now.
1020 */
1021 if (newpr->ndpr_raf_onlink == 0) {
1022 newpr->ndpr_vltime = 0;
1023 newpr->ndpr_pltime = 0;
1024 in6_init_prefix_ltimes(newpr);
1025 }
1026
1027 pr = newpr;
1028 }
1029
1030 /*
1031 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1032 * Note that pr must be non NULL at this point.
1033 */
1034
1035 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1036 if (!new->ndpr_raf_auto)
1037 goto afteraddrconf;
1038
1039 /*
1040 * 5.5.3 (b). the link-local prefix should have been ignored in
1041 * nd6_ra_input.
1042 */
1043
1044 /*
1045 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
1046 * This should have been done in nd6_ra_input.
1047 */
1048
1049 /*
1050 * 5.5.3 (d). If the prefix advertised does not match the prefix of an
1051 * address already in the list, and the Valid Lifetime is not 0,
1052 * form an address. Note that even a manually configured address
1053 * should reject autoconfiguration of a new address.
1054 */
1055 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1056 {
1057 struct in6_ifaddr *ifa6;
1058 int ifa_plen;
1059 u_int32_t storedlifetime;
1060
1061 if (ifa->ifa_addr->sa_family != AF_INET6)
1062 continue;
1063
1064 ifa6 = (struct in6_ifaddr *)ifa;
1065
1066 /*
1067 * Spec is not clear here, but I believe we should concentrate
1068 * on unicast (i.e. not anycast) addresses.
1069 * XXX: other ia6_flags? detached or duplicated?
1070 */
1071 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
1072 continue;
1073
1074 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL);
1075 if (ifa_plen != new->ndpr_plen ||
1076 !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr,
1077 &new->ndpr_prefix.sin6_addr,
1078 ifa_plen))
1079 continue;
1080
1081 if (ia6_match == NULL) /* remember the first one */
1082 ia6_match = ifa6;
1083
1084 if ((ifa6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1085 continue;
1086
1087 /*
1088 * An already autoconfigured address matched. Now that we
1089 * are sure there is at least one matched address, we can
1090 * proceed to 5.5.3. (e): update the lifetimes according to the
1091 * "two hours" rule and the privacy extension.
1092 */
1093#define TWOHOUR (120*60)
1094 lt6_tmp = ifa6->ia6_lifetime;
1095
1096 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1097 storedlifetime = ND6_INFINITE_LIFETIME;
1098 else if (IFA6_IS_INVALID(ifa6))
1099 storedlifetime = 0;
1100 else
1101 storedlifetime = lt6_tmp.ia6t_expire - time_second;
1102
1103 /* when not updating, keep the current stored lifetime. */
1104 lt6_tmp.ia6t_vltime = storedlifetime;
1105
1106 if (TWOHOUR < new->ndpr_vltime ||
1107 storedlifetime < new->ndpr_vltime) {
1108 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1109 } else if (storedlifetime <= TWOHOUR
1110#if 0
1111 /*
1112 * This condition is logically redundant, so we just
1113 * omit it.
1114 * See IPng 6712, 6717, and 6721.
1115 */
1116 && new->ndpr_vltime <= storedlifetime
1117#endif
1118 ) {
1119 if (auth) {
1120 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1121 }
1122 } else {
1123 /*
1124 * new->ndpr_vltime <= TWOHOUR &&
1125 * TWOHOUR < storedlifetime
1126 */
1127 lt6_tmp.ia6t_vltime = TWOHOUR;
1128 }
1129
1130 /* The 2 hour rule is not imposed for preferred lifetime. */
1131 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1132
1133 in6_init_address_ltimes(pr, &lt6_tmp);
1134
1135 /*
1136 * When adjusting the lifetimes of an existing temporary
1137 * address, only lower the lifetimes.
1138 * RFC 3041 3.3. (1).
1139 * XXX: how should we modify ia6t_[pv]ltime?
1140 */
1141 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
1142 if (lt6_tmp.ia6t_expire == 0 || /* no expire */
1143 lt6_tmp.ia6t_expire >
1144 ifa6->ia6_lifetime.ia6t_expire) {
1145 lt6_tmp.ia6t_expire =
1146 ifa6->ia6_lifetime.ia6t_expire;
1147 }
1148 if (lt6_tmp.ia6t_preferred == 0 || /* no expire */
1149 lt6_tmp.ia6t_preferred >
1150 ifa6->ia6_lifetime.ia6t_preferred) {
1151 lt6_tmp.ia6t_preferred =
1152 ifa6->ia6_lifetime.ia6t_preferred;
1153 }
1154 }
1155
1156 ifa6->ia6_lifetime = lt6_tmp;
1157 }
1158 if (ia6_match == NULL && new->ndpr_vltime) {
1159 /*
1160 * No address matched and the valid lifetime is non-zero.
1161 * Create a new address.
1162 */
1163 if ((ia6 = in6_ifadd(new, NULL)) != NULL) {
1164 /*
1165 * note that we should use pr (not new) for reference.
1166 */
1167 pr->ndpr_refcnt++;
1168 ia6->ia6_ndpr = pr;
1169
1170#if 0
1171 /* XXXYYY Don't do this, according to Jinmei. */
1172 pr->ndpr_addr = new->ndpr_addr;
1173#endif
1174
1175 /*
1176 * RFC 3041 3.3 (2).
1177 * When a new public address is created as described
1178 * in RFC2462, also create a new temporary address.
1179 *
1180 * RFC 3041 3.5.
1181 * When an interface connects to a new link, a new
1182 * randomized interface identifier should be generated
1183 * immediately together with a new set of temporary
1184 * addresses. Thus, we specifiy 1 as the 2nd arg of
1185 * in6_tmpifadd().
1186 */
1187 if (ip6_use_tempaddr) {
1188 int e;
1189 if ((e = in6_tmpifadd(ia6, 1)) != 0) {
1190 nd6log((LOG_NOTICE, "prelist_update: "
1191 "failed to create a temporary "
1192 "address, errno=%d\n",
1193 e));
1194 }
1195 }
1196
1197 /*
1198 * A newly added address might affect the status
1199 * of other addresses, so we check and update it.
1200 * XXX: what if address duplication happens?
1201 */
1202 pfxlist_onlink_check();
1203 } else {
1204 /* just set an error. do not bark here. */
1205 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1206 }
1207 }
1208
1209 afteraddrconf:
1210
1211 end:
1212 splx(s);
1213 return error;
1214}
1215
1216/*
1217 * A supplement function used in the on-link detection below;
1218 * detect if a given prefix has a (probably) reachable advertising router.
1219 * XXX: lengthy function name...
1220 */
1221static struct nd_pfxrouter *
1222find_pfxlist_reachable_router(pr)
1223 struct nd_prefix *pr;
1224{
1225 struct nd_pfxrouter *pfxrtr;
1226 struct rtentry *rt;
1227 struct llinfo_nd6 *ln;
1228
1229 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr;
1230 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
1231 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0,
1232 pfxrtr->router->ifp)) &&
1233 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
1234 ND6_IS_LLINFO_PROBREACH(ln))
1235 break; /* found */
1236 }
1237
1238 return(pfxrtr);
1239
1240}
1241
1242/*
1243 * Check if each prefix in the prefix list has at least one available router
1244 * that advertised the prefix (a router is "available" if its neighbor cache
1245 * entry is reachable or probably reachable).
1246 * If the check fails, the prefix may be off-link, because, for example,
1247 * we have moved from the network but the lifetime of the prefix has not
1248 * expired yet. So we should not use the prefix if there is another prefix
1249 * that has an available router.
1250 * But, if there is no prefix that has an available router, we still regards
1251 * all the prefixes as on-link. This is because we can't tell if all the
1252 * routers are simply dead or if we really moved from the network and there
1253 * is no router around us.
1254 */
1255void
1256pfxlist_onlink_check()
1257{
1258 struct nd_prefix *pr;
1259 struct in6_ifaddr *ifa;
1260
1261 /*
1262 * Check if there is a prefix that has a reachable advertising
1263 * router.
1264 */
1265 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1266 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1267 break;
1268 }
1269
1270 if (pr) {
1271 /*
1272 * There is at least one prefix that has a reachable router.
1273 * Detach prefixes which have no reachable advertising
1274 * router, and attach other prefixes.
1275 */
1276 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1277 /* XXX: a link-local prefix should never be detached */
1278 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1279 continue;
1280
1281 /*
1282 * we aren't interested in prefixes without the L bit
1283 * set.
1284 */
1285 if (pr->ndpr_raf_onlink == 0)
1286 continue;
1287
1288 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1289 find_pfxlist_reachable_router(pr) == NULL)
1290 pr->ndpr_stateflags |= NDPRF_DETACHED;
1291 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1292 find_pfxlist_reachable_router(pr) != 0)
1293 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1294 }
1295 } else {
1296 /* there is no prefix that has a reachable router */
1297 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1298 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1299 continue;
1300
1301 if (pr->ndpr_raf_onlink == 0)
1302 continue;
1303
1304 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1305 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1306 }
1307 }
1308
1309 /*
1310 * Remove each interface route associated with a (just) detached
1311 * prefix, and reinstall the interface route for a (just) attached
1312 * prefix. Note that all attempt of reinstallation does not
1313 * necessarily success, when a same prefix is shared among multiple
1314 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1315 * so we don't have to care about them.
1316 */
1317 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1318 int e;
1319
1320 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1321 continue;
1322
1323 if (pr->ndpr_raf_onlink == 0)
1324 continue;
1325
1326 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1327 (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1328 if ((e = nd6_prefix_offlink(pr)) != 0) {
1329 nd6log((LOG_ERR,
1330 "pfxlist_onlink_check: failed to "
1331 "make %s/%d offlink, errno=%d\n",
1332 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1333 pr->ndpr_plen, e));
1334 }
1335 }
1336 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1337 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 &&
1338 pr->ndpr_raf_onlink) {
1339 if ((e = nd6_prefix_onlink(pr)) != 0) {
1340 nd6log((LOG_ERR,
1341 "pfxlist_onlink_check: failed to "
1342 "make %s/%d offlink, errno=%d\n",
1343 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1344 pr->ndpr_plen, e));
1345 }
1346 }
1347 }
1348
1349 /*
1350 * Changes on the prefix status might affect address status as well.
1351 * Make sure that all addresses derived from an attached prefix are
1352 * attached, and that all addresses derived from a detached prefix are
1353 * detached. Note, however, that a manually configured address should
1354 * always be attached.
1355 * The precise detection logic is same as the one for prefixes.
1356 */
1357 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1358 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1359 continue;
1360
1361 if (ifa->ia6_ndpr == NULL) {
1362 /*
1363 * This can happen when we first configure the address
1364 * (i.e. the address exists, but the prefix does not).
1365 * XXX: complicated relationships...
1366 */
1367 continue;
1368 }
1369
1370 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1371 break;
1372 }
1373 if (ifa) {
1374 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1375 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1376 continue;
1377
1378 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1379 continue;
1380
1381 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1382 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1383 else
1384 ifa->ia6_flags |= IN6_IFF_DETACHED;
1385 }
1386 }
1387 else {
1388 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1389 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1390 continue;
1391
1392 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1393 }
1394 }
1395}
1396
1397int
1398nd6_prefix_onlink(pr)
1399 struct nd_prefix *pr;
1400{
1401 struct ifaddr *ifa;
1402 struct ifnet *ifp = pr->ndpr_ifp;
1403 struct sockaddr_in6 mask6;
1404 struct nd_prefix *opr;
1405 u_long rtflags;
1406 int error = 0;
1407 struct rtentry *rt = NULL;
1408
1409 /* sanity check */
1410 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1411 nd6log((LOG_ERR,
1412 "nd6_prefix_onlink: %s/%d is already on-link\n",
1413 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen);
1414 return(EEXIST));
1415 }
1416
1417 /*
1418 * Add the interface route associated with the prefix. Before
1419 * installing the route, check if there's the same prefix on another
1420 * interface, and the prefix has already installed the interface route.
1421 * Although such a configuration is expected to be rare, we explicitly
1422 * allow it.
1423 */
1424 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1425 if (opr == pr)
1426 continue;
1427
1428 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
1429 continue;
1430
1431 if (opr->ndpr_plen == pr->ndpr_plen &&
1432 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1433 &opr->ndpr_prefix.sin6_addr,
1434 pr->ndpr_plen))
1435 return(0);
1436 }
1437
1438 /*
1439 * We prefer link-local addresses as the associated interface address.
1440 */
1441 /* search for a link-local addr */
1442 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
1443 IN6_IFF_NOTREADY|
1444 IN6_IFF_ANYCAST);
1445 if (ifa == NULL) {
1446 /* XXX: freebsd does not have ifa_ifwithaf */
1447 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1448 {
1449 if (ifa->ifa_addr->sa_family == AF_INET6)
1450 break;
1451 }
1452 /* should we care about ia6_flags? */
1453 }
1454 if (ifa == NULL) {
1455 /*
1456 * This can still happen, when, for example, we receive an RA
1457 * containing a prefix with the L bit set and the A bit clear,
1458 * after removing all IPv6 addresses on the receiving
1459 * interface. This should, of course, be rare though.
1460 */
1461 nd6log((LOG_NOTICE,
1462 "nd6_prefix_onlink: failed to find any ifaddr"
1463 " to add route for a prefix(%s/%d) on %s\n",
1464 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1465 pr->ndpr_plen, if_name(ifp)));
1466 return(0);
1467 }
1468
1469 /*
1470 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1471 * ifa->ifa_rtrequest = nd6_rtrequest;
1472 */
1473 bzero(&mask6, sizeof(mask6));
1474 mask6.sin6_len = sizeof(mask6);
1475 mask6.sin6_addr = pr->ndpr_mask;
1476 rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP;
1477 if (nd6_need_cache(ifp)) {
1478 /* explicitly set in case ifa_flags does not set the flag. */
1479 rtflags |= RTF_CLONING;
1480 } else {
1481 /*
1482 * explicitly clear the cloning bit in case ifa_flags sets it.
1483 */
1484 rtflags &= ~RTF_CLONING;
1485 }
1486 error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix,
1487 ifa->ifa_addr, (struct sockaddr *)&mask6,
1488 rtflags, &rt);
1489 if (error == 0) {
1490 if (rt != NULL) /* this should be non NULL, though */
1491 nd6_rtmsg(RTM_ADD, rt);
1492 pr->ndpr_stateflags |= NDPRF_ONLINK;
1493 }
1494 else {
1495 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a"
1496 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
1497 "errno = %d\n",
1498 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1499 pr->ndpr_plen, if_name(ifp),
1500 ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
1501 ip6_sprintf(&mask6.sin6_addr), rtflags, error));
1502 }
1503
1504 if (rt != NULL)
1505 rt->rt_refcnt--;
1506
1507 return(error);
1508}
1509
1510int
1511nd6_prefix_offlink(pr)
1512 struct nd_prefix *pr;
1513{
1514 int error = 0;
1515 struct ifnet *ifp = pr->ndpr_ifp;
1516 struct nd_prefix *opr;
1517 struct sockaddr_in6 sa6, mask6;
1518 struct rtentry *rt = NULL;
1519
1520 /* sanity check */
1521 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1522 nd6log((LOG_ERR,
1523 "nd6_prefix_offlink: %s/%d is already off-link\n",
1524 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen));
1525 return(EEXIST);
1526 }
1527
1528 bzero(&sa6, sizeof(sa6));
1529 sa6.sin6_family = AF_INET6;
1530 sa6.sin6_len = sizeof(sa6);
1531 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
1532 sizeof(struct in6_addr));
1533 bzero(&mask6, sizeof(mask6));
1534 mask6.sin6_family = AF_INET6;
1535 mask6.sin6_len = sizeof(sa6);
1536 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
1537 error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
1538 (struct sockaddr *)&mask6, 0, &rt);
1539 if (error == 0) {
1540 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
1541
1542 /* report the route deletion to the routing socket. */
1543 if (rt != NULL)
1544 nd6_rtmsg(RTM_DELETE, rt);
1545
1546 /*
1547 * There might be the same prefix on another interface,
1548 * the prefix which could not be on-link just because we have
1549 * the interface route (see comments in nd6_prefix_onlink).
1550 * If there's one, try to make the prefix on-link on the
1551 * interface.
1552 */
1553 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1554 if (opr == pr)
1555 continue;
1556
1557 if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
1558 continue;
1559
1560 /*
1561 * KAME specific: detached prefixes should not be
1562 * on-link.
1563 */
1564 if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1565 continue;
1566
1567 if (opr->ndpr_plen == pr->ndpr_plen &&
1568 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1569 &opr->ndpr_prefix.sin6_addr,
1570 pr->ndpr_plen)) {
1571 int e;
1572
1573 if ((e = nd6_prefix_onlink(opr)) != 0) {
1574 nd6log((LOG_ERR,
1575 "nd6_prefix_offlink: failed to "
1576 "recover a prefix %s/%d from %s "
1577 "to %s (errno = %d)\n",
1578 ip6_sprintf(&opr->ndpr_prefix.sin6_addr),
1579 opr->ndpr_plen, if_name(ifp),
1580 if_name(opr->ndpr_ifp), e));
1581 }
1582 }
1583 }
1584 }
1585 else {
1586 /* XXX: can we still set the NDPRF_ONLINK flag? */
1587 nd6log((LOG_ERR,
1588 "nd6_prefix_offlink: failed to delete route: "
1589 "%s/%d on %s (errno = %d)\n",
1590 ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp),
1591 error));
1592 }
1593
1594 if (rt != NULL) {
1595 if (rt->rt_refcnt <= 0) {
1596 /* XXX: we should free the entry ourselves. */
1597 rt->rt_refcnt++;
1598 rtfree(rt);
1599 }
1600 }
1601
1602 return(error);
1603}
1604
1605static struct in6_ifaddr *
1606in6_ifadd(pr, ifid)
1607 struct nd_prefix *pr;
1608 struct in6_addr *ifid; /* Mobile IPv6 addition */
1609{
1610 struct ifnet *ifp = pr->ndpr_ifp;
1611 struct ifaddr *ifa;
1612 struct in6_aliasreq ifra;
1613 struct in6_ifaddr *ia, *ib;
1614 int error, plen0;
1615 struct in6_addr mask;
1616 int prefixlen = pr->ndpr_plen;
1617
1618 in6_len2mask(&mask, prefixlen);
1619
1620 /*
1621 * find a link-local address (will be interface ID).
1622 * Is it really mandatory? Theoretically, a global or a site-local
1623 * address can be configured without a link-local address, if we
1624 * have a unique interface identifier...
1625 *
1626 * it is not mandatory to have a link-local address, we can generate
1627 * interface identifier on the fly. we do this because:
1628 * (1) it should be the easiest way to find interface identifier.
1629 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1630 * for multiple addresses on a single interface, and possible shortcut
1631 * of DAD. we omitted DAD for this reason in the past.
1632 * (3) a user can prevent autoconfiguration of global address
1633 * by removing link-local address by hand (this is partly because we
1634 * don't have other way to control the use of IPv6 on a interface.
1635 * this has been our design choice - cf. NRL's "ifconfig auto").
1636 * (4) it is easier to manage when an interface has addresses
1637 * with the same interface identifier, than to have multiple addresses
1638 * with different interface identifiers.
1639 *
1640 * Mobile IPv6 addition: allow for caller to specify a wished interface
1641 * ID. This is to not break connections when moving addresses between
1642 * interfaces.
1643 */
1644 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */
1645 if (ifa)
1646 ib = (struct in6_ifaddr *)ifa;
1647 else
1648 return NULL;
1649
1650#if 0 /* don't care link local addr state, and always do DAD */
1651 /* if link-local address is not eligible, do not autoconfigure. */
1652 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) {
1653 printf("in6_ifadd: link-local address not ready\n");
1654 return NULL;
1655 }
1656#endif
1657
1658 /* prefixlen + ifidlen must be equal to 128 */
1659 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
1660 if (prefixlen != plen0) {
1661 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
1662 "(prefix=%d ifid=%d)\n",
1663 if_name(ifp), prefixlen, 128 - plen0));
1664 return NULL;
1665 }
1666
1667 /* make ifaddr */
1668
1669 bzero(&ifra, sizeof(ifra));
1670 /*
1671 * in6_update_ifa() does not use ifra_name, but we accurately set it
1672 * for safety.
1673 */
1674 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1675 ifra.ifra_addr.sin6_family = AF_INET6;
1676 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
1677 /* prefix */
1678 bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr,
1679 sizeof(ifra.ifra_addr.sin6_addr));
1680 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
1681 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
1682 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
1683 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
1684
1685 /* interface ID */
1686 if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid))
1687 ifid = &ib->ia_addr.sin6_addr;
1688 ifra.ifra_addr.sin6_addr.s6_addr32[0]
1689 |= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]);
1690 ifra.ifra_addr.sin6_addr.s6_addr32[1]
1691 |= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]);
1692 ifra.ifra_addr.sin6_addr.s6_addr32[2]
1693 |= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]);
1694 ifra.ifra_addr.sin6_addr.s6_addr32[3]
1695 |= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]);
1696
1697 /* new prefix mask. */
1698 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1699 ifra.ifra_prefixmask.sin6_family = AF_INET6;
1700 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
1701 sizeof(ifra.ifra_prefixmask.sin6_addr));
1702
1703 /*
1704 * lifetime.
1705 * XXX: in6_init_address_ltimes would override these values later.
1706 * We should reconsider this logic.
1707 */
1708 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
1709 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
1710
1711 /* XXX: scope zone ID? */
1712
1713 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
1714 /*
1715 * temporarily set the nopfx flag to avoid conflict.
1716 * XXX: we should reconsider the entire mechanism about prefix
1717 * manipulation.
1718 */
1719 ifra.ifra_flags |= IN6_IFF_NOPFX;
1720
1721 /*
1722 * keep the new address, regardless of the result of in6_update_ifa.
1723 * XXX: this address is now meaningless.
1724 * We should reconsider its role.
1725 */
1726 pr->ndpr_addr = ifra.ifra_addr.sin6_addr;
1727
1728 /* allocate ifaddr structure, link into chain, etc. */
1729 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
1730 nd6log((LOG_ERR,
1731 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
1732 ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp),
1733 error));
1734 return(NULL); /* ifaddr must not have been allocated. */
1735 }
1736
1737 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1738
1739 return(ia); /* this must NOT be NULL. */
1740}
1741
1742int
1743in6_tmpifadd(ia0, forcegen)
1744 const struct in6_ifaddr *ia0; /* corresponding public address */
1745{
1746 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
1747 struct in6_ifaddr *newia;
1748 struct in6_aliasreq ifra;
1749 int i, error;
1750 int trylimit = 3; /* XXX: adhoc value */
1751 u_int32_t randid[2];
1752 time_t vltime0, pltime0;
1753
1754 bzero(&ifra, sizeof(ifra));
1755 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1756 ifra.ifra_addr = ia0->ia_addr;
1757 /* copy prefix mask */
1758 ifra.ifra_prefixmask = ia0->ia_prefixmask;
1759 /* clear the old IFID */
1760 for (i = 0; i < 4; i++) {
1761 ifra.ifra_addr.sin6_addr.s6_addr32[i]
1762 &= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
1763 }
1764
1765 again:
1766 in6_get_tmpifid(ifp, (u_int8_t *)randid,
1767 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8],
1768 forcegen);
1769 ifra.ifra_addr.sin6_addr.s6_addr32[2]
1770 |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
1771 ifra.ifra_addr.sin6_addr.s6_addr32[3]
1772 |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
1773
1774 /*
1775 * If by chance the new temporary address is the same as an address
1776 * already assigned to the interface, generate a new randomized
1777 * interface identifier and repeat this step.
1778 * RFC 3041 3.3 (4).
1779 */
1780 if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) {
1781 if (trylimit-- == 0) {
1782 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find "
1783 "a unique random IFID\n"));
1784 return(EEXIST);
1785 }
1786 forcegen = 1;
1787 goto again;
1788 }
1789
1790 /*
1791 * The Valid Lifetime is the lower of the Valid Lifetime of the
1792 * public address or TEMP_VALID_LIFETIME.
1793 * The Preferred Lifetime is the lower of the Preferred Lifetime
1794 * of the public address or TEMP_PREFERRED_LIFETIME -
1795 * DESYNC_FACTOR.
1796 */
1797 if (ia0->ia6_lifetime.ia6t_expire != 0) {
1798 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
1799 (ia0->ia6_lifetime.ia6t_expire - time_second);
1800 if (vltime0 > ip6_temp_valid_lifetime)
1801 vltime0 = ip6_temp_valid_lifetime;
1802 } else
1803 vltime0 = ip6_temp_valid_lifetime;
1804 if (ia0->ia6_lifetime.ia6t_preferred != 0) {
1805 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
1806 (ia0->ia6_lifetime.ia6t_preferred - time_second);
1807 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor){
1808 pltime0 = ip6_temp_preferred_lifetime -
1809 ip6_desync_factor;
1810 }
1811 } else
1812 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor;
1813 ifra.ifra_lifetime.ia6t_vltime = vltime0;
1814 ifra.ifra_lifetime.ia6t_pltime = pltime0;
1815
1816 /*
1817 * A temporary address is created only if this calculated Preferred
1818 * Lifetime is greater than REGEN_ADVANCE time units.
1819 */
1820 if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance)
1821 return(0);
1822
1823 /* XXX: scope zone ID? */
1824
1825 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
1826
1827 /* allocate ifaddr structure, link into chain, etc. */
1828 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0)
1829 return(error);
1830
1831 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1832 if (newia == NULL) { /* XXX: can it happen? */
1833 nd6log((LOG_ERR,
1834 "in6_tmpifadd: ifa update succeeded, but we got "
1835 "no ifaddr\n"));
1836 return(EINVAL); /* XXX */
1837 }
1838 newia->ia6_ndpr = ia0->ia6_ndpr;
1839 newia->ia6_ndpr->ndpr_refcnt++;
1840
1841 return(0);
1842}
1843
1844int
1845in6_init_prefix_ltimes(struct nd_prefix *ndpr)
1846{
1847 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */
1848 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) {
1849 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime"
1850 "(%d) is greater than valid lifetime(%d)\n",
1851 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime));
1852 return (EINVAL);
1853 }
1854 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
1855 ndpr->ndpr_preferred = 0;
1856 else
1857 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime;
1858 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
1859 ndpr->ndpr_expire = 0;
1860 else
1861 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime;
1862
1863 return 0;
1864}
1865
1866static void
1867in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
1868{
1869 /* init ia6t_expire */
1870 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
1871 lt6->ia6t_expire = 0;
1872 else {
1873 lt6->ia6t_expire = time_second;
1874 lt6->ia6t_expire += lt6->ia6t_vltime;
1875 }
1876
1877 /* init ia6t_preferred */
1878 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
1879 lt6->ia6t_preferred = 0;
1880 else {
1881 lt6->ia6t_preferred = time_second;
1882 lt6->ia6t_preferred += lt6->ia6t_pltime;
1883 }
1884}
1885
1886/*
1887 * Delete all the routing table entries that use the specified gateway.
1888 * XXX: this function causes search through all entries of routing table, so
1889 * it shouldn't be called when acting as a router.
1890 */
1891void
1892rt6_flush(gateway, ifp)
1893 struct in6_addr *gateway;
1894 struct ifnet *ifp;
1895{
1896 struct radix_node_head *rnh = rt_tables[AF_INET6];
1897 int s = splnet();
1898
1899 /* We'll care only link-local addresses */
1900 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) {
1901 splx(s);
1902 return;
1903 }
1904 /* XXX: hack for KAME's link-local address kludge */
1905 gateway->s6_addr16[1] = htons(ifp->if_index);
1906
1907 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
1908 splx(s);
1909}
1910
1911static int
1912rt6_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
1946int
1947nd6_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 = ifindex2ifnet[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}