1 /*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: releng/11.0/sys/netinet6/nd6_rtr.c 301214 2016-06-02 17:21:57Z markj $");
34
35 #include "opt_inet.h"
36 #include "opt_inet6.h"
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/malloc.h>
41 #include <sys/mbuf.h>
42 #include <sys/refcount.h>
43 #include <sys/socket.h>
44 #include <sys/sockio.h>
45 #include <sys/time.h>
46 #include <sys/kernel.h>
47 #include <sys/lock.h>
48 #include <sys/errno.h>
49 #include <sys/rmlock.h>
50 #include <sys/rwlock.h>
51 #include <sys/syslog.h>
52 #include <sys/queue.h>
53
54 #include <net/if.h>
55 #include <net/if_var.h>
56 #include <net/if_types.h>
57 #include <net/if_dl.h>
58 #include <net/route.h>
59 #include <net/route_var.h>
60 #include <net/radix.h>
61 #include <net/vnet.h>
62
63 #include <netinet/in.h>
64 #include <net/if_llatbl.h>
65 #include <netinet6/in6_var.h>
66 #include <netinet6/in6_ifattach.h>
67 #include <netinet/ip6.h>
68 #include <netinet6/ip6_var.h>
69 #include <netinet6/nd6.h>
70 #include <netinet/icmp6.h>
71 #include <netinet6/scope6_var.h>
72
73 static int rtpref(struct nd_defrouter *);
74 static struct nd_defrouter *defrtrlist_update(struct nd_defrouter *);
75 static int prelist_update(struct nd_prefixctl *, struct nd_defrouter *,
76 struct mbuf *, int);
77 static struct in6_ifaddr *in6_ifadd(struct nd_prefixctl *, int);
78 static struct nd_pfxrouter *pfxrtr_lookup(struct nd_prefix *,
79 struct nd_defrouter *);
80 static void pfxrtr_add(struct nd_prefix *, struct nd_defrouter *);
81 static void pfxrtr_del(struct nd_pfxrouter *);
82 static struct nd_pfxrouter *find_pfxlist_reachable_router
83 (struct nd_prefix *);
84 static void defrouter_delreq(struct nd_defrouter *);
85 static void nd6_rtmsg(int, struct rtentry *);
86
87 static int in6_init_prefix_ltimes(struct nd_prefix *);
88 static void in6_init_address_ltimes(struct nd_prefix *,
89 struct in6_addrlifetime *);
90
91 static int nd6_prefix_onlink(struct nd_prefix *);
92 static int nd6_prefix_offlink(struct nd_prefix *);
93
94 static int rt6_deleteroute(const struct rtentry *, void *);
95
96 VNET_DECLARE(int, nd6_recalc_reachtm_interval);
97 #define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval)
98
99 static VNET_DEFINE(struct ifnet *, nd6_defifp);
100 VNET_DEFINE(int, nd6_defifindex);
101 #define V_nd6_defifp VNET(nd6_defifp)
102
103 VNET_DEFINE(int, ip6_use_tempaddr) = 0;
104
105 VNET_DEFINE(int, ip6_desync_factor);
106 VNET_DEFINE(u_int32_t, ip6_temp_preferred_lifetime) = DEF_TEMP_PREFERRED_LIFETIME;
107 VNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime) = DEF_TEMP_VALID_LIFETIME;
108
109 VNET_DEFINE(int, ip6_temp_regen_advance) = TEMPADDR_REGEN_ADVANCE;
110
111 /* RTPREF_MEDIUM has to be 0! */
112 #define RTPREF_HIGH 1
113 #define RTPREF_MEDIUM 0
114 #define RTPREF_LOW (-1)
115 #define RTPREF_RESERVED (-2)
116 #define RTPREF_INVALID (-3) /* internal */
117
118 /*
119 * Receive Router Solicitation Message - just for routers.
120 * Router solicitation/advertisement is mostly managed by userland program
121 * (rtadvd) so here we have no function like nd6_ra_output().
122 *
123 * Based on RFC 2461
124 */
125 void
126 nd6_rs_input(struct mbuf *m, int off, int icmp6len)
127 {
128 struct ifnet *ifp = m->m_pkthdr.rcvif;
129 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
130 struct nd_router_solicit *nd_rs;
131 struct in6_addr saddr6 = ip6->ip6_src;
132 char *lladdr = NULL;
133 int lladdrlen = 0;
134 union nd_opts ndopts;
135 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
136
137 /*
138 * Accept RS only when V_ip6_forwarding=1 and the interface has
139 * no ND6_IFF_ACCEPT_RTADV.
140 */
141 if (!V_ip6_forwarding || ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV)
142 goto freeit;
143
144 /* Sanity checks */
145 if (ip6->ip6_hlim != 255) {
146 nd6log((LOG_ERR,
147 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
148 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
149 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
150 goto bad;
151 }
152
153 /*
154 * Don't update the neighbor cache, if src = ::.
155 * This indicates that the src has no IP address assigned yet.
156 */
157 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
158 goto freeit;
159
160 #ifndef PULLDOWN_TEST
161 IP6_EXTHDR_CHECK(m, off, icmp6len,);
162 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
163 #else
164 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
165 if (nd_rs == NULL) {
166 ICMP6STAT_INC(icp6s_tooshort);
167 return;
168 }
169 #endif
170
171 icmp6len -= sizeof(*nd_rs);
172 nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
173 if (nd6_options(&ndopts) < 0) {
174 nd6log((LOG_INFO,
175 "nd6_rs_input: invalid ND option, ignored\n"));
176 /* nd6_options have incremented stats */
177 goto freeit;
178 }
179
180 if (ndopts.nd_opts_src_lladdr) {
181 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
182 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
183 }
184
185 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
186 nd6log((LOG_INFO,
187 "nd6_rs_input: lladdrlen mismatch for %s "
188 "(if %d, RS packet %d)\n",
189 ip6_sprintf(ip6bufs, &saddr6),
190 ifp->if_addrlen, lladdrlen - 2));
191 goto bad;
192 }
193
194 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
195
196 freeit:
197 m_freem(m);
198 return;
199
200 bad:
201 ICMP6STAT_INC(icp6s_badrs);
202 m_freem(m);
203 }
204
205 /*
206 * Receive Router Advertisement Message.
207 *
208 * Based on RFC 2461
209 * TODO: on-link bit on prefix information
210 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
211 */
212 void
213 nd6_ra_input(struct mbuf *m, int off, int icmp6len)
214 {
215 struct ifnet *ifp = m->m_pkthdr.rcvif;
216 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
217 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
218 struct nd_router_advert *nd_ra;
219 struct in6_addr saddr6 = ip6->ip6_src;
220 int mcast = 0;
221 union nd_opts ndopts;
222 struct nd_defrouter *dr;
223 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
224
225 dr = NULL;
226
227 /*
228 * We only accept RAs only when the per-interface flag
229 * ND6_IFF_ACCEPT_RTADV is on the receiving interface.
230 */
231 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
232 goto freeit;
233
234 if (ip6->ip6_hlim != 255) {
235 nd6log((LOG_ERR,
236 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
237 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
238 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
239 goto bad;
240 }
241
242 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
243 nd6log((LOG_ERR,
244 "nd6_ra_input: src %s is not link-local\n",
245 ip6_sprintf(ip6bufs, &saddr6)));
246 goto bad;
247 }
248
249 #ifndef PULLDOWN_TEST
250 IP6_EXTHDR_CHECK(m, off, icmp6len,);
251 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
252 #else
253 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
254 if (nd_ra == NULL) {
255 ICMP6STAT_INC(icp6s_tooshort);
256 return;
257 }
258 #endif
259
260 icmp6len -= sizeof(*nd_ra);
261 nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
262 if (nd6_options(&ndopts) < 0) {
263 nd6log((LOG_INFO,
264 "nd6_ra_input: invalid ND option, ignored\n"));
265 /* nd6_options have incremented stats */
266 goto freeit;
267 }
268
269 {
270 struct nd_defrouter dr0;
271 u_int32_t advreachable = nd_ra->nd_ra_reachable;
272
273 /* remember if this is a multicasted advertisement */
274 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
275 mcast = 1;
276
277 bzero(&dr0, sizeof(dr0));
278 dr0.rtaddr = saddr6;
279 dr0.raflags = nd_ra->nd_ra_flags_reserved;
280 /*
281 * Effectively-disable routes from RA messages when
282 * ND6_IFF_NO_RADR enabled on the receiving interface or
283 * (ip6.forwarding == 1 && ip6.rfc6204w3 != 1).
284 */
285 if (ndi->flags & ND6_IFF_NO_RADR)
286 dr0.rtlifetime = 0;
287 else if (V_ip6_forwarding && !V_ip6_rfc6204w3)
288 dr0.rtlifetime = 0;
289 else
290 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
291 dr0.expire = time_uptime + dr0.rtlifetime;
292 dr0.ifp = ifp;
293 /* unspecified or not? (RFC 2461 6.3.4) */
294 if (advreachable) {
295 advreachable = ntohl(advreachable);
296 if (advreachable <= MAX_REACHABLE_TIME &&
297 ndi->basereachable != advreachable) {
298 ndi->basereachable = advreachable;
299 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
300 ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */
301 }
302 }
303 if (nd_ra->nd_ra_retransmit)
304 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
305 if (nd_ra->nd_ra_curhoplimit) {
306 if (ndi->chlim < nd_ra->nd_ra_curhoplimit)
307 ndi->chlim = nd_ra->nd_ra_curhoplimit;
308 else if (ndi->chlim != nd_ra->nd_ra_curhoplimit) {
309 log(LOG_ERR, "RA with a lower CurHopLimit sent from "
310 "%s on %s (current = %d, received = %d). "
311 "Ignored.\n", ip6_sprintf(ip6bufs, &ip6->ip6_src),
312 if_name(ifp), ndi->chlim, nd_ra->nd_ra_curhoplimit);
313 }
314 }
315 dr = defrtrlist_update(&dr0);
316 }
317
318 /*
319 * prefix
320 */
321 if (ndopts.nd_opts_pi) {
322 struct nd_opt_hdr *pt;
323 struct nd_opt_prefix_info *pi = NULL;
324 struct nd_prefixctl pr;
325
326 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
327 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
328 pt = (struct nd_opt_hdr *)((caddr_t)pt +
329 (pt->nd_opt_len << 3))) {
330 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
331 continue;
332 pi = (struct nd_opt_prefix_info *)pt;
333
334 if (pi->nd_opt_pi_len != 4) {
335 nd6log((LOG_INFO,
336 "nd6_ra_input: invalid option "
337 "len %d for prefix information option, "
338 "ignored\n", pi->nd_opt_pi_len));
339 continue;
340 }
341
342 if (128 < pi->nd_opt_pi_prefix_len) {
343 nd6log((LOG_INFO,
344 "nd6_ra_input: invalid prefix "
345 "len %d for prefix information option, "
346 "ignored\n", pi->nd_opt_pi_prefix_len));
347 continue;
348 }
349
350 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
351 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
352 nd6log((LOG_INFO,
353 "nd6_ra_input: invalid prefix "
354 "%s, ignored\n",
355 ip6_sprintf(ip6bufs,
356 &pi->nd_opt_pi_prefix)));
357 continue;
358 }
359
360 bzero(&pr, sizeof(pr));
361 pr.ndpr_prefix.sin6_family = AF_INET6;
362 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
363 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
364 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
365
366 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
367 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
368 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
369 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
370 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
371 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
372 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
373 (void)prelist_update(&pr, dr, m, mcast);
374 }
375 }
376 if (dr != NULL) {
377 defrouter_rele(dr);
378 dr = NULL;
379 }
380
381 /*
382 * MTU
383 */
384 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
385 u_long mtu;
386 u_long maxmtu;
387
388 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
389
390 /* lower bound */
391 if (mtu < IPV6_MMTU) {
392 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
393 "mtu=%lu sent from %s, ignoring\n",
394 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src)));
395 goto skip;
396 }
397
398 /* upper bound */
399 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
400 ? ndi->maxmtu : ifp->if_mtu;
401 if (mtu <= maxmtu) {
402 int change = (ndi->linkmtu != mtu);
403
404 ndi->linkmtu = mtu;
405 if (change) /* in6_maxmtu may change */
406 in6_setmaxmtu();
407 } else {
408 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
409 "mtu=%lu sent from %s; "
410 "exceeds maxmtu %lu, ignoring\n",
411 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu));
412 }
413 }
414
415 skip:
416
417 /*
418 * Source link layer address
419 */
420 {
421 char *lladdr = NULL;
422 int lladdrlen = 0;
423
424 if (ndopts.nd_opts_src_lladdr) {
425 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
426 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
427 }
428
429 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
430 nd6log((LOG_INFO,
431 "nd6_ra_input: lladdrlen mismatch for %s "
432 "(if %d, RA packet %d)\n", ip6_sprintf(ip6bufs, &saddr6),
433 ifp->if_addrlen, lladdrlen - 2));
434 goto bad;
435 }
436
437 nd6_cache_lladdr(ifp, &saddr6, lladdr,
438 lladdrlen, ND_ROUTER_ADVERT, 0);
439
440 /*
441 * Installing a link-layer address might change the state of the
442 * router's neighbor cache, which might also affect our on-link
443 * detection of adveritsed prefixes.
444 */
445 pfxlist_onlink_check();
446 }
447
448 freeit:
449 m_freem(m);
450 return;
451
452 bad:
453 ICMP6STAT_INC(icp6s_badra);
454 m_freem(m);
455 }
456
457 /* tell the change to user processes watching the routing socket. */
458 static void
459 nd6_rtmsg(int cmd, struct rtentry *rt)
460 {
461 struct rt_addrinfo info;
462 struct ifnet *ifp;
463 struct ifaddr *ifa;
464
465 bzero((caddr_t)&info, sizeof(info));
466 info.rti_info[RTAX_DST] = rt_key(rt);
467 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
468 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
469 ifp = rt->rt_ifp;
470 if (ifp != NULL) {
471 IF_ADDR_RLOCK(ifp);
472 ifa = TAILQ_FIRST(&ifp->if_addrhead);
473 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
474 ifa_ref(ifa);
475 IF_ADDR_RUNLOCK(ifp);
476 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
477 } else
478 ifa = NULL;
479
480 rt_missmsg_fib(cmd, &info, rt->rt_flags, 0, rt->rt_fibnum);
481 if (ifa != NULL)
482 ifa_free(ifa);
483 }
484
485 /*
486 * default router list processing sub routines
487 */
488
489 static void
490 defrouter_addreq(struct nd_defrouter *new)
491 {
492 struct sockaddr_in6 def, mask, gate;
493 struct rtentry *newrt = NULL;
494 int error;
495
496 bzero(&def, sizeof(def));
497 bzero(&mask, sizeof(mask));
498 bzero(&gate, sizeof(gate));
499
500 def.sin6_len = mask.sin6_len = gate.sin6_len =
501 sizeof(struct sockaddr_in6);
502 def.sin6_family = gate.sin6_family = AF_INET6;
503 gate.sin6_addr = new->rtaddr;
504
505 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&def,
506 (struct sockaddr *)&gate, (struct sockaddr *)&mask,
507 RTF_GATEWAY, &newrt, RT_DEFAULT_FIB);
508 if (newrt) {
509 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
510 RTFREE(newrt);
511 }
512 if (error == 0)
513 new->installed = 1;
514 }
515
516 struct nd_defrouter *
517 defrouter_lookup_locked(struct in6_addr *addr, struct ifnet *ifp)
518 {
519 struct nd_defrouter *dr;
520
521 ND6_LOCK_ASSERT();
522 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry)
523 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) {
524 defrouter_ref(dr);
525 return (dr);
526 }
527 return (NULL);
528 }
529
530 struct nd_defrouter *
531 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
532 {
533 struct nd_defrouter *dr;
534
535 ND6_RLOCK();
536 dr = defrouter_lookup_locked(addr, ifp);
537 ND6_RUNLOCK();
538 return (dr);
539 }
540
541 void
542 defrouter_ref(struct nd_defrouter *dr)
543 {
544
545 refcount_acquire(&dr->refcnt);
546 }
547
548 void
549 defrouter_rele(struct nd_defrouter *dr)
550 {
551
552 if (refcount_release(&dr->refcnt))
553 free(dr, M_IP6NDP);
554 }
555
556 /*
557 * Remove the default route for a given router.
558 * This is just a subroutine function for defrouter_select(), and should
559 * not be called from anywhere else.
560 */
561 static void
562 defrouter_delreq(struct nd_defrouter *dr)
563 {
564 struct sockaddr_in6 def, mask, gate;
565 struct rtentry *oldrt = NULL;
566
567 bzero(&def, sizeof(def));
568 bzero(&mask, sizeof(mask));
569 bzero(&gate, sizeof(gate));
570
571 def.sin6_len = mask.sin6_len = gate.sin6_len =
572 sizeof(struct sockaddr_in6);
573 def.sin6_family = gate.sin6_family = AF_INET6;
574 gate.sin6_addr = dr->rtaddr;
575
576 in6_rtrequest(RTM_DELETE, (struct sockaddr *)&def,
577 (struct sockaddr *)&gate,
578 (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt, RT_DEFAULT_FIB);
579 if (oldrt) {
580 nd6_rtmsg(RTM_DELETE, oldrt);
581 RTFREE(oldrt);
582 }
583
584 dr->installed = 0;
585 }
586
587 /*
588 * Remove all default routes from default router list.
589 */
590 void
591 defrouter_reset(void)
592 {
593 struct nd_defrouter *dr, **dra;
594 int count, i;
595
596 count = i = 0;
597
598 /*
599 * We can't delete routes with the ND lock held, so make a copy of the
600 * current default router list and use that when deleting routes.
601 */
602 ND6_RLOCK();
603 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry)
604 count++;
605 ND6_RUNLOCK();
606
607 dra = malloc(count * sizeof(*dra), M_TEMP, M_WAITOK | M_ZERO);
608
609 ND6_RLOCK();
610 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
611 if (i == count)
612 break;
613 defrouter_ref(dr);
614 dra[i++] = dr;
615 }
616 ND6_RUNLOCK();
617
618 for (i = 0; i < count && dra[i] != NULL; i++) {
619 defrouter_delreq(dra[i]);
620 defrouter_rele(dra[i]);
621 }
622 free(dra, M_TEMP);
623
624 /*
625 * XXX should we also nuke any default routers in the kernel, by
626 * going through them by rtalloc1()?
627 */
628 }
629
630 /*
631 * Look up a matching default router list entry and remove it. Returns true if a
632 * matching entry was found, false otherwise.
633 */
634 bool
635 defrouter_remove(struct in6_addr *addr, struct ifnet *ifp)
636 {
637 struct nd_defrouter *dr;
638
639 ND6_WLOCK();
640 dr = defrouter_lookup_locked(addr, ifp);
641 if (dr == NULL) {
642 ND6_WUNLOCK();
643 return (false);
644 }
645
646 defrouter_unlink(dr, NULL);
647 ND6_WUNLOCK();
648 defrouter_del(dr);
649 defrouter_rele(dr);
650 return (true);
651 }
652
653 /*
654 * Remove a router from the global list and optionally stash it in a
655 * caller-supplied queue.
656 *
657 * The ND lock must be held.
658 */
659 void
660 defrouter_unlink(struct nd_defrouter *dr, struct nd_drhead *drq)
661 {
662
663 ND6_WLOCK_ASSERT();
664 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
665 if (drq != NULL)
666 TAILQ_INSERT_TAIL(drq, dr, dr_entry);
667 }
668
669 void
670 defrouter_del(struct nd_defrouter *dr)
671 {
672 struct nd_defrouter *deldr = NULL;
673 struct nd_prefix *pr;
674
675 ND6_UNLOCK_ASSERT();
676
677 /*
678 * Flush all the routing table entries that use the router
679 * as a next hop.
680 */
681 if (ND_IFINFO(dr->ifp)->flags & ND6_IFF_ACCEPT_RTADV)
682 rt6_flush(&dr->rtaddr, dr->ifp);
683
684 if (dr->installed) {
685 deldr = dr;
686 defrouter_delreq(dr);
687 }
688
689 /*
690 * Also delete all the pointers to the router in each prefix lists.
691 */
692 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
693 struct nd_pfxrouter *pfxrtr;
694 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
695 pfxrtr_del(pfxrtr);
696 }
697 pfxlist_onlink_check();
698
699 /*
700 * If the router is the primary one, choose a new one.
701 * Note that defrouter_select() will remove the current gateway
702 * from the routing table.
703 */
704 if (deldr)
705 defrouter_select();
706
707 /*
708 * Release the list reference.
709 */
710 defrouter_rele(dr);
711 }
712
713 /*
714 * Default Router Selection according to Section 6.3.6 of RFC 2461 and
715 * draft-ietf-ipngwg-router-selection:
716 * 1) Routers that are reachable or probably reachable should be preferred.
717 * If we have more than one (probably) reachable router, prefer ones
718 * with the highest router preference.
719 * 2) When no routers on the list are known to be reachable or
720 * probably reachable, routers SHOULD be selected in a round-robin
721 * fashion, regardless of router preference values.
722 * 3) If the Default Router List is empty, assume that all
723 * destinations are on-link.
724 *
725 * We assume nd_defrouter is sorted by router preference value.
726 * Since the code below covers both with and without router preference cases,
727 * we do not need to classify the cases by ifdef.
728 *
729 * At this moment, we do not try to install more than one default router,
730 * even when the multipath routing is available, because we're not sure about
731 * the benefits for stub hosts comparing to the risk of making the code
732 * complicated and the possibility of introducing bugs.
733 */
734 void
735 defrouter_select(void)
736 {
737 struct nd_defrouter *dr, *selected_dr, *installed_dr;
738 struct llentry *ln = NULL;
739
740 ND6_RLOCK();
741 /*
742 * Let's handle easy case (3) first:
743 * If default router list is empty, there's nothing to be done.
744 */
745 if (TAILQ_EMPTY(&V_nd_defrouter)) {
746 ND6_RUNLOCK();
747 return;
748 }
749
750 /*
751 * Search for a (probably) reachable router from the list.
752 * We just pick up the first reachable one (if any), assuming that
753 * the ordering rule of the list described in defrtrlist_update().
754 */
755 selected_dr = installed_dr = NULL;
756 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
757 IF_AFDATA_RLOCK(dr->ifp);
758 if (selected_dr == NULL &&
759 (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
760 ND6_IS_LLINFO_PROBREACH(ln)) {
761 selected_dr = dr;
762 defrouter_ref(selected_dr);
763 }
764 IF_AFDATA_RUNLOCK(dr->ifp);
765 if (ln != NULL) {
766 LLE_RUNLOCK(ln);
767 ln = NULL;
768 }
769
770 if (dr->installed) {
771 if (installed_dr == NULL) {
772 installed_dr = dr;
773 defrouter_ref(installed_dr);
774 } else {
775 /* this should not happen. warn for diagnosis. */
776 log(LOG_ERR,
777 "defrouter_select: more than one router is installed\n");
778 }
779 }
780 }
781 /*
782 * If none of the default routers was found to be reachable,
783 * round-robin the list regardless of preference.
784 * Otherwise, if we have an installed router, check if the selected
785 * (reachable) router should really be preferred to the installed one.
786 * We only prefer the new router when the old one is not reachable
787 * or when the new one has a really higher preference value.
788 */
789 if (selected_dr == NULL) {
790 if (installed_dr == NULL ||
791 TAILQ_NEXT(installed_dr, dr_entry) == NULL)
792 selected_dr = TAILQ_FIRST(&V_nd_defrouter);
793 else
794 selected_dr = TAILQ_NEXT(installed_dr, dr_entry);
795 defrouter_ref(selected_dr);
796 } else if (installed_dr != NULL) {
797 IF_AFDATA_RLOCK(installed_dr->ifp);
798 if ((ln = nd6_lookup(&installed_dr->rtaddr, 0, installed_dr->ifp)) &&
799 ND6_IS_LLINFO_PROBREACH(ln) &&
800 rtpref(selected_dr) <= rtpref(installed_dr)) {
801 defrouter_rele(selected_dr);
802 selected_dr = installed_dr;
803 }
804 IF_AFDATA_RUNLOCK(installed_dr->ifp);
805 if (ln != NULL)
806 LLE_RUNLOCK(ln);
807 }
808 ND6_RUNLOCK();
809
810 /*
811 * If the selected router is different than the installed one,
812 * remove the installed router and install the selected one.
813 * Note that the selected router is never NULL here.
814 */
815 if (installed_dr != selected_dr) {
816 if (installed_dr != NULL) {
817 defrouter_delreq(installed_dr);
818 defrouter_rele(installed_dr);
819 }
820 defrouter_addreq(selected_dr);
821 }
822 defrouter_rele(selected_dr);
823 }
824
825 /*
826 * for default router selection
827 * regards router-preference field as a 2-bit signed integer
828 */
829 static int
830 rtpref(struct nd_defrouter *dr)
831 {
832 switch (dr->raflags & ND_RA_FLAG_RTPREF_MASK) {
833 case ND_RA_FLAG_RTPREF_HIGH:
834 return (RTPREF_HIGH);
835 case ND_RA_FLAG_RTPREF_MEDIUM:
836 case ND_RA_FLAG_RTPREF_RSV:
837 return (RTPREF_MEDIUM);
838 case ND_RA_FLAG_RTPREF_LOW:
839 return (RTPREF_LOW);
840 default:
841 /*
842 * This case should never happen. If it did, it would mean a
843 * serious bug of kernel internal. We thus always bark here.
844 * Or, can we even panic?
845 */
846 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->raflags);
847 return (RTPREF_INVALID);
848 }
849 /* NOTREACHED */
850 }
851
852 static struct nd_defrouter *
853 defrtrlist_update(struct nd_defrouter *new)
854 {
855 struct nd_defrouter *dr, *n;
856 int oldpref;
857
858 if (new->rtlifetime == 0) {
859 defrouter_remove(&new->rtaddr, new->ifp);
860 return (NULL);
861 }
862
863 ND6_WLOCK();
864 dr = defrouter_lookup_locked(&new->rtaddr, new->ifp);
865 if (dr != NULL) {
866 oldpref = rtpref(dr);
867
868 /* override */
869 dr->raflags = new->raflags; /* XXX flag check */
870 dr->rtlifetime = new->rtlifetime;
871 dr->expire = new->expire;
872
873 /*
874 * If the preference does not change, there's no need
875 * to sort the entries. Also make sure the selected
876 * router is still installed in the kernel.
877 */
878 if (dr->installed && rtpref(new) == oldpref) {
879 ND6_WUNLOCK();
880 return (dr);
881 }
882
883 /*
884 * The preferred router may have changed, so relocate this
885 * router.
886 */
887 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
888 n = dr;
889 } else {
890 n = malloc(sizeof(*n), M_IP6NDP, M_NOWAIT | M_ZERO);
891 if (n == NULL) {
892 ND6_WUNLOCK();
893 return (NULL);
894 }
895 memcpy(n, new, sizeof(*n));
896 /* Initialize with an extra reference for the caller. */
897 refcount_init(&n->refcnt, 2);
898 }
899
900 /*
901 * Insert the new router in the Default Router List;
902 * The Default Router List should be in the descending order
903 * of router-preferece. Routers with the same preference are
904 * sorted in the arriving time order.
905 */
906
907 /* insert at the end of the group */
908 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
909 if (rtpref(n) > rtpref(dr))
910 break;
911 }
912 if (dr != NULL)
913 TAILQ_INSERT_BEFORE(dr, n, dr_entry);
914 else
915 TAILQ_INSERT_TAIL(&V_nd_defrouter, n, dr_entry);
916 ND6_WUNLOCK();
917
918 defrouter_select();
919
920 return (n);
921 }
922
923 static struct nd_pfxrouter *
924 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
925 {
926 struct nd_pfxrouter *search;
927
928 LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) {
929 if (search->router == dr)
930 break;
931 }
932
933 return (search);
934 }
935
936 static void
937 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
938 {
939 struct nd_pfxrouter *new;
940
941 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
942 if (new == NULL)
943 return;
944 new->router = dr;
945 defrouter_ref(dr);
946
947 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
948
949 pfxlist_onlink_check();
950 }
951
952 static void
953 pfxrtr_del(struct nd_pfxrouter *pfr)
954 {
955
956 LIST_REMOVE(pfr, pfr_entry);
957 defrouter_rele(pfr->router);
958 free(pfr, M_IP6NDP);
959 }
960
961 struct nd_prefix *
962 nd6_prefix_lookup(struct nd_prefixctl *key)
963 {
964 struct nd_prefix *search;
965
966 LIST_FOREACH(search, &V_nd_prefix, ndpr_entry) {
967 if (key->ndpr_ifp == search->ndpr_ifp &&
968 key->ndpr_plen == search->ndpr_plen &&
969 in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr,
970 &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) {
971 break;
972 }
973 }
974
975 return (search);
976 }
977
978 int
979 nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr,
980 struct nd_prefix **newp)
981 {
982 struct nd_prefix *new = NULL;
983 int error = 0;
984 char ip6buf[INET6_ADDRSTRLEN];
985
986 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
987 if (new == NULL)
988 return (ENOMEM);
989 new->ndpr_ifp = pr->ndpr_ifp;
990 new->ndpr_prefix = pr->ndpr_prefix;
991 new->ndpr_plen = pr->ndpr_plen;
992 new->ndpr_vltime = pr->ndpr_vltime;
993 new->ndpr_pltime = pr->ndpr_pltime;
994 new->ndpr_flags = pr->ndpr_flags;
995 if ((error = in6_init_prefix_ltimes(new)) != 0) {
996 free(new, M_IP6NDP);
997 return (error);
998 }
999 new->ndpr_lastupdate = time_uptime;
1000
1001 /* initialization */
1002 LIST_INIT(&new->ndpr_advrtrs);
1003 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
1004 /* make prefix in the canonical form */
1005 IN6_MASK_ADDR(&new->ndpr_prefix.sin6_addr, &new->ndpr_mask);
1006
1007 /* link ndpr_entry to nd_prefix list */
1008 LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry);
1009
1010 /* ND_OPT_PI_FLAG_ONLINK processing */
1011 if (new->ndpr_raf_onlink) {
1012 int e;
1013
1014 if ((e = nd6_prefix_onlink(new)) != 0) {
1015 nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
1016 "the prefix %s/%d on-link on %s (errno=%d)\n",
1017 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1018 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
1019 /* proceed anyway. XXX: is it correct? */
1020 }
1021 }
1022
1023 if (dr != NULL)
1024 pfxrtr_add(new, dr);
1025 if (newp != NULL)
1026 *newp = new;
1027 return (0);
1028 }
1029
1030 void
1031 prelist_remove(struct nd_prefix *pr)
1032 {
1033 struct nd_pfxrouter *pfr, *next;
1034 int e;
1035 char ip6buf[INET6_ADDRSTRLEN];
1036
1037 /* make sure to invalidate the prefix until it is really freed. */
1038 pr->ndpr_vltime = 0;
1039 pr->ndpr_pltime = 0;
1040
1041 /*
1042 * Though these flags are now meaningless, we'd rather keep the value
1043 * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users
1044 * when executing "ndp -p".
1045 */
1046
1047 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
1048 (e = nd6_prefix_offlink(pr)) != 0) {
1049 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
1050 "on %s, errno=%d\n",
1051 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1052 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
1053 /* what should we do? */
1054 }
1055
1056 if (pr->ndpr_refcnt > 0)
1057 return; /* notice here? */
1058
1059 /* unlink ndpr_entry from nd_prefix list */
1060 LIST_REMOVE(pr, ndpr_entry);
1061
1062 /* free list of routers that advertised the prefix */
1063 LIST_FOREACH_SAFE(pfr, &pr->ndpr_advrtrs, pfr_entry, next) {
1064 pfxrtr_del(pfr);
1065 }
1066 free(pr, M_IP6NDP);
1067
1068 pfxlist_onlink_check();
1069 }
1070
1071 /*
1072 * dr - may be NULL
1073 */
1074
1075 static int
1076 prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr,
1077 struct mbuf *m, int mcast)
1078 {
1079 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
1080 struct ifaddr *ifa;
1081 struct ifnet *ifp = new->ndpr_ifp;
1082 struct nd_prefix *pr;
1083 int error = 0;
1084 int auth;
1085 struct in6_addrlifetime lt6_tmp;
1086 char ip6buf[INET6_ADDRSTRLEN];
1087
1088 auth = 0;
1089 if (m) {
1090 /*
1091 * Authenticity for NA consists authentication for
1092 * both IP header and IP datagrams, doesn't it ?
1093 */
1094 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
1095 auth = ((m->m_flags & M_AUTHIPHDR) &&
1096 (m->m_flags & M_AUTHIPDGM));
1097 #endif
1098 }
1099
1100 if ((pr = nd6_prefix_lookup(new)) != NULL) {
1101 /*
1102 * nd6_prefix_lookup() ensures that pr and new have the same
1103 * prefix on a same interface.
1104 */
1105
1106 /*
1107 * Update prefix information. Note that the on-link (L) bit
1108 * and the autonomous (A) bit should NOT be changed from 1
1109 * to 0.
1110 */
1111 if (new->ndpr_raf_onlink == 1)
1112 pr->ndpr_raf_onlink = 1;
1113 if (new->ndpr_raf_auto == 1)
1114 pr->ndpr_raf_auto = 1;
1115 if (new->ndpr_raf_onlink) {
1116 pr->ndpr_vltime = new->ndpr_vltime;
1117 pr->ndpr_pltime = new->ndpr_pltime;
1118 (void)in6_init_prefix_ltimes(pr); /* XXX error case? */
1119 pr->ndpr_lastupdate = time_uptime;
1120 }
1121
1122 if (new->ndpr_raf_onlink &&
1123 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1124 int e;
1125
1126 if ((e = nd6_prefix_onlink(pr)) != 0) {
1127 nd6log((LOG_ERR,
1128 "prelist_update: failed to make "
1129 "the prefix %s/%d on-link on %s "
1130 "(errno=%d)\n",
1131 ip6_sprintf(ip6buf,
1132 &pr->ndpr_prefix.sin6_addr),
1133 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
1134 /* proceed anyway. XXX: is it correct? */
1135 }
1136 }
1137
1138 if (dr && pfxrtr_lookup(pr, dr) == NULL)
1139 pfxrtr_add(pr, dr);
1140 } else {
1141 if (new->ndpr_vltime == 0)
1142 goto end;
1143 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
1144 goto end;
1145
1146 error = nd6_prelist_add(new, dr, &pr);
1147 if (error != 0) {
1148 nd6log((LOG_NOTICE, "prelist_update: "
1149 "nd6_prelist_add failed for %s/%d on %s errno=%d\n",
1150 ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr),
1151 new->ndpr_plen, if_name(new->ndpr_ifp), error));
1152 goto end; /* we should just give up in this case. */
1153 }
1154
1155 /*
1156 * XXX: from the ND point of view, we can ignore a prefix
1157 * with the on-link bit being zero. However, we need a
1158 * prefix structure for references from autoconfigured
1159 * addresses. Thus, we explicitly make sure that the prefix
1160 * itself expires now.
1161 */
1162 if (pr->ndpr_raf_onlink == 0) {
1163 pr->ndpr_vltime = 0;
1164 pr->ndpr_pltime = 0;
1165 in6_init_prefix_ltimes(pr);
1166 }
1167 }
1168
1169 /*
1170 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1171 * Note that pr must be non NULL at this point.
1172 */
1173
1174 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1175 if (!new->ndpr_raf_auto)
1176 goto end;
1177
1178 /*
1179 * 5.5.3 (b). the link-local prefix should have been ignored in
1180 * nd6_ra_input.
1181 */
1182
1183 /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */
1184 if (new->ndpr_pltime > new->ndpr_vltime) {
1185 error = EINVAL; /* XXX: won't be used */
1186 goto end;
1187 }
1188
1189 /*
1190 * 5.5.3 (d). If the prefix advertised is not equal to the prefix of
1191 * an address configured by stateless autoconfiguration already in the
1192 * list of addresses associated with the interface, and the Valid
1193 * Lifetime is not 0, form an address. We first check if we have
1194 * a matching prefix.
1195 * Note: we apply a clarification in rfc2462bis-02 here. We only
1196 * consider autoconfigured addresses while RFC2462 simply said
1197 * "address".
1198 */
1199 IF_ADDR_RLOCK(ifp);
1200 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1201 struct in6_ifaddr *ifa6;
1202 u_int32_t remaininglifetime;
1203
1204 if (ifa->ifa_addr->sa_family != AF_INET6)
1205 continue;
1206
1207 ifa6 = (struct in6_ifaddr *)ifa;
1208
1209 /*
1210 * We only consider autoconfigured addresses as per rfc2462bis.
1211 */
1212 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
1213 continue;
1214
1215 /*
1216 * Spec is not clear here, but I believe we should concentrate
1217 * on unicast (i.e. not anycast) addresses.
1218 * XXX: other ia6_flags? detached or duplicated?
1219 */
1220 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
1221 continue;
1222
1223 /*
1224 * Ignore the address if it is not associated with a prefix
1225 * or is associated with a prefix that is different from this
1226 * one. (pr is never NULL here)
1227 */
1228 if (ifa6->ia6_ndpr != pr)
1229 continue;
1230
1231 if (ia6_match == NULL) /* remember the first one */
1232 ia6_match = ifa6;
1233
1234 /*
1235 * An already autoconfigured address matched. Now that we
1236 * are sure there is at least one matched address, we can
1237 * proceed to 5.5.3. (e): update the lifetimes according to the
1238 * "two hours" rule and the privacy extension.
1239 * We apply some clarifications in rfc2462bis:
1240 * - use remaininglifetime instead of storedlifetime as a
1241 * variable name
1242 * - remove the dead code in the "two-hour" rule
1243 */
1244 #define TWOHOUR (120*60)
1245 lt6_tmp = ifa6->ia6_lifetime;
1246
1247 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1248 remaininglifetime = ND6_INFINITE_LIFETIME;
1249 else if (time_uptime - ifa6->ia6_updatetime >
1250 lt6_tmp.ia6t_vltime) {
1251 /*
1252 * The case of "invalid" address. We should usually
1253 * not see this case.
1254 */
1255 remaininglifetime = 0;
1256 } else
1257 remaininglifetime = lt6_tmp.ia6t_vltime -
1258 (time_uptime - ifa6->ia6_updatetime);
1259
1260 /* when not updating, keep the current stored lifetime. */
1261 lt6_tmp.ia6t_vltime = remaininglifetime;
1262
1263 if (TWOHOUR < new->ndpr_vltime ||
1264 remaininglifetime < new->ndpr_vltime) {
1265 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1266 } else if (remaininglifetime <= TWOHOUR) {
1267 if (auth) {
1268 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1269 }
1270 } else {
1271 /*
1272 * new->ndpr_vltime <= TWOHOUR &&
1273 * TWOHOUR < remaininglifetime
1274 */
1275 lt6_tmp.ia6t_vltime = TWOHOUR;
1276 }
1277
1278 /* The 2 hour rule is not imposed for preferred lifetime. */
1279 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1280
1281 in6_init_address_ltimes(pr, <6_tmp);
1282
1283 /*
1284 * We need to treat lifetimes for temporary addresses
1285 * differently, according to
1286 * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1);
1287 * we only update the lifetimes when they are in the maximum
1288 * intervals.
1289 */
1290 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
1291 u_int32_t maxvltime, maxpltime;
1292
1293 if (V_ip6_temp_valid_lifetime >
1294 (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
1295 V_ip6_desync_factor)) {
1296 maxvltime = V_ip6_temp_valid_lifetime -
1297 (time_uptime - ifa6->ia6_createtime) -
1298 V_ip6_desync_factor;
1299 } else
1300 maxvltime = 0;
1301 if (V_ip6_temp_preferred_lifetime >
1302 (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
1303 V_ip6_desync_factor)) {
1304 maxpltime = V_ip6_temp_preferred_lifetime -
1305 (time_uptime - ifa6->ia6_createtime) -
1306 V_ip6_desync_factor;
1307 } else
1308 maxpltime = 0;
1309
1310 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME ||
1311 lt6_tmp.ia6t_vltime > maxvltime) {
1312 lt6_tmp.ia6t_vltime = maxvltime;
1313 }
1314 if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME ||
1315 lt6_tmp.ia6t_pltime > maxpltime) {
1316 lt6_tmp.ia6t_pltime = maxpltime;
1317 }
1318 }
1319 ifa6->ia6_lifetime = lt6_tmp;
1320 ifa6->ia6_updatetime = time_uptime;
1321 }
1322 IF_ADDR_RUNLOCK(ifp);
1323 if (ia6_match == NULL && new->ndpr_vltime) {
1324 int ifidlen;
1325
1326 /*
1327 * 5.5.3 (d) (continued)
1328 * No address matched and the valid lifetime is non-zero.
1329 * Create a new address.
1330 */
1331
1332 /*
1333 * Prefix Length check:
1334 * If the sum of the prefix length and interface identifier
1335 * length does not equal 128 bits, the Prefix Information
1336 * option MUST be ignored. The length of the interface
1337 * identifier is defined in a separate link-type specific
1338 * document.
1339 */
1340 ifidlen = in6_if2idlen(ifp);
1341 if (ifidlen < 0) {
1342 /* this should not happen, so we always log it. */
1343 log(LOG_ERR, "prelist_update: IFID undefined (%s)\n",
1344 if_name(ifp));
1345 goto end;
1346 }
1347 if (ifidlen + pr->ndpr_plen != 128) {
1348 nd6log((LOG_INFO,
1349 "prelist_update: invalid prefixlen "
1350 "%d for %s, ignored\n",
1351 pr->ndpr_plen, if_name(ifp)));
1352 goto end;
1353 }
1354
1355 if ((ia6 = in6_ifadd(new, mcast)) != NULL) {
1356 /*
1357 * note that we should use pr (not new) for reference.
1358 */
1359 pr->ndpr_refcnt++;
1360 ia6->ia6_ndpr = pr;
1361
1362 /*
1363 * RFC 3041 3.3 (2).
1364 * When a new public address is created as described
1365 * in RFC2462, also create a new temporary address.
1366 *
1367 * RFC 3041 3.5.
1368 * When an interface connects to a new link, a new
1369 * randomized interface identifier should be generated
1370 * immediately together with a new set of temporary
1371 * addresses. Thus, we specifiy 1 as the 2nd arg of
1372 * in6_tmpifadd().
1373 */
1374 if (V_ip6_use_tempaddr) {
1375 int e;
1376 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) {
1377 nd6log((LOG_NOTICE, "prelist_update: "
1378 "failed to create a temporary "
1379 "address, errno=%d\n",
1380 e));
1381 }
1382 }
1383 ifa_free(&ia6->ia_ifa);
1384
1385 /*
1386 * A newly added address might affect the status
1387 * of other addresses, so we check and update it.
1388 * XXX: what if address duplication happens?
1389 */
1390 pfxlist_onlink_check();
1391 } else {
1392 /* just set an error. do not bark here. */
1393 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1394 }
1395 }
1396
1397 end:
1398 return error;
1399 }
1400
1401 /*
1402 * A supplement function used in the on-link detection below;
1403 * detect if a given prefix has a (probably) reachable advertising router.
1404 * XXX: lengthy function name...
1405 */
1406 static struct nd_pfxrouter *
1407 find_pfxlist_reachable_router(struct nd_prefix *pr)
1408 {
1409 struct nd_pfxrouter *pfxrtr;
1410 struct llentry *ln;
1411 int canreach;
1412
1413 LIST_FOREACH(pfxrtr, &pr->ndpr_advrtrs, pfr_entry) {
1414 IF_AFDATA_RLOCK(pfxrtr->router->ifp);
1415 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp);
1416 IF_AFDATA_RUNLOCK(pfxrtr->router->ifp);
1417 if (ln == NULL)
1418 continue;
1419 canreach = ND6_IS_LLINFO_PROBREACH(ln);
1420 LLE_RUNLOCK(ln);
1421 if (canreach)
1422 break;
1423 }
1424 return (pfxrtr);
1425 }
1426
1427 /*
1428 * Check if each prefix in the prefix list has at least one available router
1429 * that advertised the prefix (a router is "available" if its neighbor cache
1430 * entry is reachable or probably reachable).
1431 * If the check fails, the prefix may be off-link, because, for example,
1432 * we have moved from the network but the lifetime of the prefix has not
1433 * expired yet. So we should not use the prefix if there is another prefix
1434 * that has an available router.
1435 * But, if there is no prefix that has an available router, we still regards
1436 * all the prefixes as on-link. This is because we can't tell if all the
1437 * routers are simply dead or if we really moved from the network and there
1438 * is no router around us.
1439 */
1440 void
1441 pfxlist_onlink_check(void)
1442 {
1443 struct nd_prefix *pr;
1444 struct in6_ifaddr *ifa;
1445 struct nd_defrouter *dr;
1446 struct nd_pfxrouter *pfxrtr = NULL;
1447 struct rm_priotracker in6_ifa_tracker;
1448
1449 /*
1450 * Check if there is a prefix that has a reachable advertising
1451 * router.
1452 */
1453 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1454 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1455 break;
1456 }
1457
1458 /*
1459 * If we have no such prefix, check whether we still have a router
1460 * that does not advertise any prefixes.
1461 */
1462 if (pr == NULL) {
1463 ND6_RLOCK();
1464 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
1465 struct nd_prefix *pr0;
1466
1467 LIST_FOREACH(pr0, &V_nd_prefix, ndpr_entry) {
1468 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
1469 break;
1470 }
1471 if (pfxrtr != NULL)
1472 break;
1473 }
1474 ND6_RUNLOCK();
1475 }
1476 if (pr != NULL || (!TAILQ_EMPTY(&V_nd_defrouter) && pfxrtr == NULL)) {
1477 /*
1478 * There is at least one prefix that has a reachable router,
1479 * or at least a router which probably does not advertise
1480 * any prefixes. The latter would be the case when we move
1481 * to a new link where we have a router that does not provide
1482 * prefixes and we configure an address by hand.
1483 * Detach prefixes which have no reachable advertising
1484 * router, and attach other prefixes.
1485 */
1486 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1487 /* XXX: a link-local prefix should never be detached */
1488 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1489 continue;
1490
1491 /*
1492 * we aren't interested in prefixes without the L bit
1493 * set.
1494 */
1495 if (pr->ndpr_raf_onlink == 0)
1496 continue;
1497
1498 if (pr->ndpr_raf_auto == 0)
1499 continue;
1500
1501 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1502 find_pfxlist_reachable_router(pr) == NULL)
1503 pr->ndpr_stateflags |= NDPRF_DETACHED;
1504 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1505 find_pfxlist_reachable_router(pr) != NULL)
1506 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1507 }
1508 } else {
1509 /* there is no prefix that has a reachable router */
1510 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1511 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1512 continue;
1513
1514 if (pr->ndpr_raf_onlink == 0)
1515 continue;
1516
1517 if (pr->ndpr_raf_auto == 0)
1518 continue;
1519
1520 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1521 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1522 }
1523 }
1524
1525 /*
1526 * Remove each interface route associated with a (just) detached
1527 * prefix, and reinstall the interface route for a (just) attached
1528 * prefix. Note that all attempt of reinstallation does not
1529 * necessarily success, when a same prefix is shared among multiple
1530 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1531 * so we don't have to care about them.
1532 */
1533 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1534 int e;
1535 char ip6buf[INET6_ADDRSTRLEN];
1536
1537 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1538 continue;
1539
1540 if (pr->ndpr_raf_onlink == 0)
1541 continue;
1542
1543 if (pr->ndpr_raf_auto == 0)
1544 continue;
1545
1546 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1547 (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1548 if ((e = nd6_prefix_offlink(pr)) != 0) {
1549 nd6log((LOG_ERR,
1550 "pfxlist_onlink_check: failed to "
1551 "make %s/%d offlink, errno=%d\n",
1552 ip6_sprintf(ip6buf,
1553 &pr->ndpr_prefix.sin6_addr),
1554 pr->ndpr_plen, e));
1555 }
1556 }
1557 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1558 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 &&
1559 pr->ndpr_raf_onlink) {
1560 if ((e = nd6_prefix_onlink(pr)) != 0) {
1561 nd6log((LOG_ERR,
1562 "pfxlist_onlink_check: failed to "
1563 "make %s/%d onlink, errno=%d\n",
1564 ip6_sprintf(ip6buf,
1565 &pr->ndpr_prefix.sin6_addr),
1566 pr->ndpr_plen, e));
1567 }
1568 }
1569 }
1570
1571 /*
1572 * Changes on the prefix status might affect address status as well.
1573 * Make sure that all addresses derived from an attached prefix are
1574 * attached, and that all addresses derived from a detached prefix are
1575 * detached. Note, however, that a manually configured address should
1576 * always be attached.
1577 * The precise detection logic is same as the one for prefixes.
1578 */
1579 IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1580 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1581 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1582 continue;
1583
1584 if (ifa->ia6_ndpr == NULL) {
1585 /*
1586 * This can happen when we first configure the address
1587 * (i.e. the address exists, but the prefix does not).
1588 * XXX: complicated relationships...
1589 */
1590 continue;
1591 }
1592
1593 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1594 break;
1595 }
1596 if (ifa) {
1597 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1598 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1599 continue;
1600
1601 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1602 continue;
1603
1604 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) {
1605 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1606 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1607 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1608 nd6_dad_start((struct ifaddr *)ifa, 0);
1609 }
1610 } else {
1611 ifa->ia6_flags |= IN6_IFF_DETACHED;
1612 }
1613 }
1614 } else {
1615 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1616 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1617 continue;
1618
1619 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1620 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1621 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1622 /* Do we need a delay in this case? */
1623 nd6_dad_start((struct ifaddr *)ifa, 0);
1624 }
1625 }
1626 }
1627 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1628 }
1629
1630 static int
1631 nd6_prefix_onlink_rtrequest(struct nd_prefix *pr, struct ifaddr *ifa)
1632 {
1633 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
1634 struct rib_head *rnh;
1635 struct rtentry *rt;
1636 struct sockaddr_in6 mask6;
1637 u_long rtflags;
1638 int error, a_failure, fibnum;
1639
1640 /*
1641 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1642 * ifa->ifa_rtrequest = nd6_rtrequest;
1643 */
1644 bzero(&mask6, sizeof(mask6));
1645 mask6.sin6_len = sizeof(mask6);
1646 mask6.sin6_addr = pr->ndpr_mask;
1647 rtflags = (ifa->ifa_flags & ~IFA_RTSELF) | RTF_UP;
1648
1649 a_failure = 0;
1650 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
1651
1652 rt = NULL;
1653 error = in6_rtrequest(RTM_ADD,
1654 (struct sockaddr *)&pr->ndpr_prefix, ifa->ifa_addr,
1655 (struct sockaddr *)&mask6, rtflags, &rt, fibnum);
1656 if (error == 0) {
1657 KASSERT(rt != NULL, ("%s: in6_rtrequest return no "
1658 "error(%d) but rt is NULL, pr=%p, ifa=%p", __func__,
1659 error, pr, ifa));
1660
1661 rnh = rt_tables_get_rnh(rt->rt_fibnum, AF_INET6);
1662 /* XXX what if rhn == NULL? */
1663 RIB_WLOCK(rnh);
1664 RT_LOCK(rt);
1665 if (rt_setgate(rt, rt_key(rt),
1666 (struct sockaddr *)&null_sdl) == 0) {
1667 struct sockaddr_dl *dl;
1668
1669 dl = (struct sockaddr_dl *)rt->rt_gateway;
1670 dl->sdl_type = rt->rt_ifp->if_type;
1671 dl->sdl_index = rt->rt_ifp->if_index;
1672 }
1673 RIB_WUNLOCK(rnh);
1674 nd6_rtmsg(RTM_ADD, rt);
1675 RT_UNLOCK(rt);
1676 pr->ndpr_stateflags |= NDPRF_ONLINK;
1677 } else {
1678 char ip6buf[INET6_ADDRSTRLEN];
1679 char ip6bufg[INET6_ADDRSTRLEN];
1680 char ip6bufm[INET6_ADDRSTRLEN];
1681 struct sockaddr_in6 *sin6;
1682
1683 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
1684 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add "
1685 "route for a prefix (%s/%d) on %s, gw=%s, mask=%s, "
1686 "flags=%lx errno = %d\n",
1687 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1688 pr->ndpr_plen, if_name(pr->ndpr_ifp),
1689 ip6_sprintf(ip6bufg, &sin6->sin6_addr),
1690 ip6_sprintf(ip6bufm, &mask6.sin6_addr),
1691 rtflags, error));
1692
1693 /* Save last error to return, see rtinit(). */
1694 a_failure = error;
1695 }
1696
1697 if (rt != NULL) {
1698 RT_LOCK(rt);
1699 RT_REMREF(rt);
1700 RT_UNLOCK(rt);
1701 }
1702 }
1703
1704 /* Return the last error we got. */
1705 return (a_failure);
1706 }
1707
1708 static int
1709 nd6_prefix_onlink(struct nd_prefix *pr)
1710 {
1711 struct ifaddr *ifa;
1712 struct ifnet *ifp = pr->ndpr_ifp;
1713 struct nd_prefix *opr;
1714 int error = 0;
1715 char ip6buf[INET6_ADDRSTRLEN];
1716
1717 /* sanity check */
1718 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1719 nd6log((LOG_ERR,
1720 "nd6_prefix_onlink: %s/%d is already on-link\n",
1721 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1722 pr->ndpr_plen));
1723 return (EEXIST);
1724 }
1725
1726 /*
1727 * Add the interface route associated with the prefix. Before
1728 * installing the route, check if there's the same prefix on another
1729 * interface, and the prefix has already installed the interface route.
1730 * Although such a configuration is expected to be rare, we explicitly
1731 * allow it.
1732 */
1733 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
1734 if (opr == pr)
1735 continue;
1736
1737 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
1738 continue;
1739
1740 if (opr->ndpr_plen == pr->ndpr_plen &&
1741 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1742 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen))
1743 return (0);
1744 }
1745
1746 /*
1747 * We prefer link-local addresses as the associated interface address.
1748 */
1749 /* search for a link-local addr */
1750 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
1751 IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
1752 if (ifa == NULL) {
1753 /* XXX: freebsd does not have ifa_ifwithaf */
1754 IF_ADDR_RLOCK(ifp);
1755 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1756 if (ifa->ifa_addr->sa_family == AF_INET6)
1757 break;
1758 }
1759 if (ifa != NULL)
1760 ifa_ref(ifa);
1761 IF_ADDR_RUNLOCK(ifp);
1762 /* should we care about ia6_flags? */
1763 }
1764 if (ifa == NULL) {
1765 /*
1766 * This can still happen, when, for example, we receive an RA
1767 * containing a prefix with the L bit set and the A bit clear,
1768 * after removing all IPv6 addresses on the receiving
1769 * interface. This should, of course, be rare though.
1770 */
1771 nd6log((LOG_NOTICE,
1772 "nd6_prefix_onlink: failed to find any ifaddr"
1773 " to add route for a prefix(%s/%d) on %s\n",
1774 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1775 pr->ndpr_plen, if_name(ifp)));
1776 return (0);
1777 }
1778
1779 error = nd6_prefix_onlink_rtrequest(pr, ifa);
1780
1781 if (ifa != NULL)
1782 ifa_free(ifa);
1783
1784 return (error);
1785 }
1786
1787 static int
1788 nd6_prefix_offlink(struct nd_prefix *pr)
1789 {
1790 int error = 0;
1791 struct ifnet *ifp = pr->ndpr_ifp;
1792 struct nd_prefix *opr;
1793 struct sockaddr_in6 sa6, mask6;
1794 struct rtentry *rt;
1795 char ip6buf[INET6_ADDRSTRLEN];
1796 int fibnum, a_failure;
1797
1798 /* sanity check */
1799 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1800 nd6log((LOG_ERR,
1801 "nd6_prefix_offlink: %s/%d is already off-link\n",
1802 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1803 pr->ndpr_plen));
1804 return (EEXIST);
1805 }
1806
1807 bzero(&sa6, sizeof(sa6));
1808 sa6.sin6_family = AF_INET6;
1809 sa6.sin6_len = sizeof(sa6);
1810 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
1811 sizeof(struct in6_addr));
1812 bzero(&mask6, sizeof(mask6));
1813 mask6.sin6_family = AF_INET6;
1814 mask6.sin6_len = sizeof(sa6);
1815 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
1816
1817 a_failure = 0;
1818 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
1819 rt = NULL;
1820 error = in6_rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
1821 (struct sockaddr *)&mask6, 0, &rt, fibnum);
1822 if (error == 0) {
1823 /* report the route deletion to the routing socket. */
1824 if (rt != NULL)
1825 nd6_rtmsg(RTM_DELETE, rt);
1826 } else {
1827 /* Save last error to return, see rtinit(). */
1828 a_failure = error;
1829 }
1830 if (rt != NULL) {
1831 RTFREE(rt);
1832 }
1833 }
1834 error = a_failure;
1835 a_failure = 1;
1836 if (error == 0) {
1837 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
1838
1839 /*
1840 * There might be the same prefix on another interface,
1841 * the prefix which could not be on-link just because we have
1842 * the interface route (see comments in nd6_prefix_onlink).
1843 * If there's one, try to make the prefix on-link on the
1844 * interface.
1845 */
1846 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
1847 if (opr == pr)
1848 continue;
1849
1850 if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
1851 continue;
1852
1853 /*
1854 * KAME specific: detached prefixes should not be
1855 * on-link.
1856 */
1857 if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1858 continue;
1859
1860 if (opr->ndpr_plen == pr->ndpr_plen &&
1861 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1862 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
1863 int e;
1864
1865 if ((e = nd6_prefix_onlink(opr)) != 0) {
1866 nd6log((LOG_ERR,
1867 "nd6_prefix_offlink: failed to "
1868 "recover a prefix %s/%d from %s "
1869 "to %s (errno = %d)\n",
1870 ip6_sprintf(ip6buf,
1871 &opr->ndpr_prefix.sin6_addr),
1872 opr->ndpr_plen, if_name(ifp),
1873 if_name(opr->ndpr_ifp), e));
1874 } else
1875 a_failure = 0;
1876 }
1877 }
1878 } else {
1879 /* XXX: can we still set the NDPRF_ONLINK flag? */
1880 nd6log((LOG_ERR,
1881 "nd6_prefix_offlink: failed to delete route: "
1882 "%s/%d on %s (errno = %d)\n",
1883 ip6_sprintf(ip6buf, &sa6.sin6_addr), pr->ndpr_plen,
1884 if_name(ifp), error));
1885 }
1886
1887 if (a_failure)
1888 lltable_prefix_free(AF_INET6, (struct sockaddr *)&sa6,
1889 (struct sockaddr *)&mask6, LLE_STATIC);
1890
1891 return (error);
1892 }
1893
1894 static struct in6_ifaddr *
1895 in6_ifadd(struct nd_prefixctl *pr, int mcast)
1896 {
1897 struct ifnet *ifp = pr->ndpr_ifp;
1898 struct ifaddr *ifa;
1899 struct in6_aliasreq ifra;
1900 struct in6_ifaddr *ia, *ib;
1901 int error, plen0;
1902 struct in6_addr mask;
1903 int prefixlen = pr->ndpr_plen;
1904 int updateflags;
1905 char ip6buf[INET6_ADDRSTRLEN];
1906
1907 in6_prefixlen2mask(&mask, prefixlen);
1908
1909 /*
1910 * find a link-local address (will be interface ID).
1911 * Is it really mandatory? Theoretically, a global or a site-local
1912 * address can be configured without a link-local address, if we
1913 * have a unique interface identifier...
1914 *
1915 * it is not mandatory to have a link-local address, we can generate
1916 * interface identifier on the fly. we do this because:
1917 * (1) it should be the easiest way to find interface identifier.
1918 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1919 * for multiple addresses on a single interface, and possible shortcut
1920 * of DAD. we omitted DAD for this reason in the past.
1921 * (3) a user can prevent autoconfiguration of global address
1922 * by removing link-local address by hand (this is partly because we
1923 * don't have other way to control the use of IPv6 on an interface.
1924 * this has been our design choice - cf. NRL's "ifconfig auto").
1925 * (4) it is easier to manage when an interface has addresses
1926 * with the same interface identifier, than to have multiple addresses
1927 * with different interface identifiers.
1928 */
1929 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
1930 if (ifa)
1931 ib = (struct in6_ifaddr *)ifa;
1932 else
1933 return NULL;
1934
1935 /* prefixlen + ifidlen must be equal to 128 */
1936 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
1937 if (prefixlen != plen0) {
1938 ifa_free(ifa);
1939 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
1940 "(prefix=%d ifid=%d)\n",
1941 if_name(ifp), prefixlen, 128 - plen0));
1942 return NULL;
1943 }
1944
1945 /* make ifaddr */
1946 in6_prepare_ifra(&ifra, &pr->ndpr_prefix.sin6_addr, &mask);
1947
1948 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr, &mask);
1949 /* interface ID */
1950 ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
1951 (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
1952 ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
1953 (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
1954 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
1955 (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
1956 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
1957 (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
1958 ifa_free(ifa);
1959
1960 /* lifetimes. */
1961 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
1962 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
1963
1964 /* XXX: scope zone ID? */
1965
1966 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
1967
1968 /*
1969 * Make sure that we do not have this address already. This should
1970 * usually not happen, but we can still see this case, e.g., if we
1971 * have manually configured the exact address to be configured.
1972 */
1973 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
1974 &ifra.ifra_addr.sin6_addr);
1975 if (ifa != NULL) {
1976 ifa_free(ifa);
1977 /* this should be rare enough to make an explicit log */
1978 log(LOG_INFO, "in6_ifadd: %s is already configured\n",
1979 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr));
1980 return (NULL);
1981 }
1982
1983 /*
1984 * Allocate ifaddr structure, link into chain, etc.
1985 * If we are going to create a new address upon receiving a multicasted
1986 * RA, we need to impose a random delay before starting DAD.
1987 * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2]
1988 */
1989 updateflags = 0;
1990 if (mcast)
1991 updateflags |= IN6_IFAUPDATE_DADDELAY;
1992 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) {
1993 nd6log((LOG_ERR,
1994 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
1995 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr),
1996 if_name(ifp), error));
1997 return (NULL); /* ifaddr must not have been allocated. */
1998 }
1999
2000 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
2001 /*
2002 * XXXRW: Assumption of non-NULLness here might not be true with
2003 * fine-grained locking -- should we validate it? Or just return
2004 * earlier ifa rather than looking it up again?
2005 */
2006 return (ia); /* this is always non-NULL and referenced. */
2007 }
2008
2009 /*
2010 * ia0 - corresponding public address
2011 */
2012 int
2013 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay)
2014 {
2015 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
2016 struct in6_ifaddr *newia;
2017 struct in6_aliasreq ifra;
2018 int error;
2019 int trylimit = 3; /* XXX: adhoc value */
2020 int updateflags;
2021 u_int32_t randid[2];
2022 time_t vltime0, pltime0;
2023
2024 in6_prepare_ifra(&ifra, &ia0->ia_addr.sin6_addr,
2025 &ia0->ia_prefixmask.sin6_addr);
2026
2027 ifra.ifra_addr = ia0->ia_addr; /* XXX: do we need this ? */
2028 /* clear the old IFID */
2029 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr,
2030 &ifra.ifra_prefixmask.sin6_addr);
2031
2032 again:
2033 if (in6_get_tmpifid(ifp, (u_int8_t *)randid,
2034 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) {
2035 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find a good "
2036 "random IFID\n"));
2037 return (EINVAL);
2038 }
2039 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
2040 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
2041 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
2042 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
2043
2044 /*
2045 * in6_get_tmpifid() quite likely provided a unique interface ID.
2046 * However, we may still have a chance to see collision, because
2047 * there may be a time lag between generation of the ID and generation
2048 * of the address. So, we'll do one more sanity check.
2049 */
2050
2051 if (in6_localip(&ifra.ifra_addr.sin6_addr) != 0) {
2052 if (trylimit-- > 0) {
2053 forcegen = 1;
2054 goto again;
2055 }
2056
2057 /* Give up. Something strange should have happened. */
2058 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to "
2059 "find a unique random IFID\n"));
2060 return (EEXIST);
2061 }
2062
2063 /*
2064 * The Valid Lifetime is the lower of the Valid Lifetime of the
2065 * public address or TEMP_VALID_LIFETIME.
2066 * The Preferred Lifetime is the lower of the Preferred Lifetime
2067 * of the public address or TEMP_PREFERRED_LIFETIME -
2068 * DESYNC_FACTOR.
2069 */
2070 if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
2071 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
2072 (ia0->ia6_lifetime.ia6t_vltime -
2073 (time_uptime - ia0->ia6_updatetime));
2074 if (vltime0 > V_ip6_temp_valid_lifetime)
2075 vltime0 = V_ip6_temp_valid_lifetime;
2076 } else
2077 vltime0 = V_ip6_temp_valid_lifetime;
2078 if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
2079 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
2080 (ia0->ia6_lifetime.ia6t_pltime -
2081 (time_uptime - ia0->ia6_updatetime));
2082 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){
2083 pltime0 = V_ip6_temp_preferred_lifetime -
2084 V_ip6_desync_factor;
2085 }
2086 } else
2087 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor;
2088 ifra.ifra_lifetime.ia6t_vltime = vltime0;
2089 ifra.ifra_lifetime.ia6t_pltime = pltime0;
2090
2091 /*
2092 * A temporary address is created only if this calculated Preferred
2093 * Lifetime is greater than REGEN_ADVANCE time units.
2094 */
2095 if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance)
2096 return (0);
2097
2098 /* XXX: scope zone ID? */
2099
2100 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
2101
2102 /* allocate ifaddr structure, link into chain, etc. */
2103 updateflags = 0;
2104 if (delay)
2105 updateflags |= IN6_IFAUPDATE_DADDELAY;
2106 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0)
2107 return (error);
2108
2109 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
2110 if (newia == NULL) { /* XXX: can it happen? */
2111 nd6log((LOG_ERR,
2112 "in6_tmpifadd: ifa update succeeded, but we got "
2113 "no ifaddr\n"));
2114 return (EINVAL); /* XXX */
2115 }
2116 newia->ia6_ndpr = ia0->ia6_ndpr;
2117 newia->ia6_ndpr->ndpr_refcnt++;
2118 ifa_free(&newia->ia_ifa);
2119
2120 /*
2121 * A newly added address might affect the status of other addresses.
2122 * XXX: when the temporary address is generated with a new public
2123 * address, the onlink check is redundant. However, it would be safe
2124 * to do the check explicitly everywhere a new address is generated,
2125 * and, in fact, we surely need the check when we create a new
2126 * temporary address due to deprecation of an old temporary address.
2127 */
2128 pfxlist_onlink_check();
2129
2130 return (0);
2131 }
2132
2133 static int
2134 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
2135 {
2136 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
2137 ndpr->ndpr_preferred = 0;
2138 else
2139 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime;
2140 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
2141 ndpr->ndpr_expire = 0;
2142 else
2143 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime;
2144
2145 return 0;
2146 }
2147
2148 static void
2149 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
2150 {
2151 /* init ia6t_expire */
2152 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
2153 lt6->ia6t_expire = 0;
2154 else {
2155 lt6->ia6t_expire = time_uptime;
2156 lt6->ia6t_expire += lt6->ia6t_vltime;
2157 }
2158
2159 /* init ia6t_preferred */
2160 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
2161 lt6->ia6t_preferred = 0;
2162 else {
2163 lt6->ia6t_preferred = time_uptime;
2164 lt6->ia6t_preferred += lt6->ia6t_pltime;
2165 }
2166 }
2167
2168 /*
2169 * Delete all the routing table entries that use the specified gateway.
2170 * XXX: this function causes search through all entries of routing table, so
2171 * it shouldn't be called when acting as a router.
2172 */
2173 void
2174 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
2175 {
2176
2177 /* We'll care only link-local addresses */
2178 if (!IN6_IS_ADDR_LINKLOCAL(gateway))
2179 return;
2180
2181 /* XXX Do we really need to walk any but the default FIB? */
2182 rt_foreach_fib_walk_del(AF_INET6, rt6_deleteroute, (void *)gateway);
2183 }
2184
2185 static int
2186 rt6_deleteroute(const struct rtentry *rt, void *arg)
2187 {
2188 #define SIN6(s) ((struct sockaddr_in6 *)s)
2189 struct in6_addr *gate = (struct in6_addr *)arg;
2190
2191 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
2192 return (0);
2193
2194 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) {
2195 return (0);
2196 }
2197
2198 /*
2199 * Do not delete a static route.
2200 * XXX: this seems to be a bit ad-hoc. Should we consider the
2201 * 'cloned' bit instead?
2202 */
2203 if ((rt->rt_flags & RTF_STATIC) != 0)
2204 return (0);
2205
2206 /*
2207 * We delete only host route. This means, in particular, we don't
2208 * delete default route.
2209 */
2210 if ((rt->rt_flags & RTF_HOST) == 0)
2211 return (0);
2212
2213 return (1);
2214 #undef SIN6
2215 }
2216
2217 int
2218 nd6_setdefaultiface(int ifindex)
2219 {
2220 int error = 0;
2221
2222 if (ifindex < 0 || V_if_index < ifindex)
2223 return (EINVAL);
2224 if (ifindex != 0 && !ifnet_byindex(ifindex))
2225 return (EINVAL);
2226
2227 if (V_nd6_defifindex != ifindex) {
2228 V_nd6_defifindex = ifindex;
2229 if (V_nd6_defifindex > 0)
2230 V_nd6_defifp = ifnet_byindex(V_nd6_defifindex);
2231 else
2232 V_nd6_defifp = NULL;
2233
2234 /*
2235 * Our current implementation assumes one-to-one maping between
2236 * interfaces and links, so it would be natural to use the
2237 * default interface as the default link.
2238 */
2239 scope6_setdefault(V_nd6_defifp);
2240 }
2241
2242 return (error);
2243 }
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