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Rewrite driver for Intel 2100BG:
[dragonfly.git] / sys / netinet6 / nd6.c
blob784f4f51396b3a4f71d536c8a2aa33e53011f91c
1 /* $FreeBSD: src/sys/netinet6/nd6.c,v 1.2.2.15 2003/05/06 06:46:58 suz Exp $ */
2 /* $DragonFly: src/sys/netinet6/nd6.c,v 1.26 2008/01/05 14:02:40 swildner Exp $ */
3 /* $KAME: nd6.c,v 1.144 2001/05/24 07:44:00 itojun 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 /*
35 * XXX
36 * KAME 970409 note:
37 * BSD/OS version heavily modifies this code, related to llinfo.
38 * Since we don't have BSD/OS version of net/route.c in our hand,
39 * I left the code mostly as it was in 970310. -- itojun
40 */
41
42 #include "opt_inet.h"
43 #include "opt_inet6.h"
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/callout.h>
48 #include <sys/malloc.h>
49 #include <sys/mbuf.h>
50 #include <sys/socket.h>
51 #include <sys/sockio.h>
52 #include <sys/time.h>
53 #include <sys/kernel.h>
54 #include <sys/protosw.h>
55 #include <sys/errno.h>
56 #include <sys/syslog.h>
57 #include <sys/queue.h>
58 #include <sys/sysctl.h>
59 #include <sys/thread2.h>
60
61 #include <net/if.h>
62 #include <net/if_dl.h>
63 #include <net/if_types.h>
64 #include <net/if_atm.h>
65 #include <net/route.h>
66
67 #include <netinet/in.h>
68 #include <netinet/if_ether.h>
69 #include <netinet6/in6_var.h>
70 #include <netinet/ip6.h>
71 #include <netinet6/ip6_var.h>
72 #include <netinet6/nd6.h>
73 #include <netinet6/in6_prefix.h>
74 #include <netinet/icmp6.h>
75
76 #include "use_loop.h"
77
78 #include <net/net_osdep.h>
79
80 #define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */
81 #define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */
82
83 #define SIN6(s) ((struct sockaddr_in6 *)s)
84 #define SDL(s) ((struct sockaddr_dl *)s)
85
86 /* timer values */
87 int nd6_prune = 1; /* walk list every 1 seconds */
88 int nd6_delay = 5; /* delay first probe time 5 second */
89 int nd6_umaxtries = 3; /* maximum unicast query */
90 int nd6_mmaxtries = 3; /* maximum multicast query */
91 int nd6_useloopback = 1; /* use loopback interface for local traffic */
92 int nd6_gctimer = (60 * 60 * 24); /* 1 day: garbage collection timer */
93
94 /* preventing too many loops in ND option parsing */
95 int nd6_maxndopt = 10; /* max # of ND options allowed */
96
97 int nd6_maxnudhint = 0; /* max # of subsequent upper layer hints */
98
99 #ifdef ND6_DEBUG
100 int nd6_debug = 1;
101 #else
102 int nd6_debug = 0;
103 #endif
104
105 /* for debugging? */
106 static int nd6_inuse, nd6_allocated;
107
108 struct llinfo_nd6 llinfo_nd6 = {&llinfo_nd6, &llinfo_nd6};
109 struct nd_drhead nd_defrouter;
110 struct nd_prhead nd_prefix = { 0 };
111
112 int nd6_recalc_reachtm_interval = ND6_RECALC_REACHTM_INTERVAL;
113 static struct sockaddr_in6 all1_sa;
114
115 static void nd6_setmtu0 (struct ifnet *, struct nd_ifinfo *);
116 static void nd6_slowtimo (void *);
117 static int regen_tmpaddr (struct in6_ifaddr *);
118
119 struct callout nd6_slowtimo_ch;
120 struct callout nd6_timer_ch;
121 extern struct callout in6_tmpaddrtimer_ch;
122
123 void
124 nd6_init(void)
125 {
126 static int nd6_init_done = 0;
127 int i;
128
129 if (nd6_init_done) {
130 log(LOG_NOTICE, "nd6_init called more than once(ignored)\n");
131 return;
132 }
133
134 all1_sa.sin6_family = AF_INET6;
135 all1_sa.sin6_len = sizeof(struct sockaddr_in6);
136 for (i = 0; i < sizeof(all1_sa.sin6_addr); i++)
137 all1_sa.sin6_addr.s6_addr[i] = 0xff;
138
139 /* initialization of the default router list */
140 TAILQ_INIT(&nd_defrouter);
141
142 nd6_init_done = 1;
143
144 /* start timer */
145 callout_init(&nd6_slowtimo_ch);
146 callout_reset(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
147 nd6_slowtimo, NULL);
148 }
149
150 struct nd_ifinfo *
151 nd6_ifattach(struct ifnet *ifp)
152 {
153 struct nd_ifinfo *nd;
154
155 nd = (struct nd_ifinfo *)kmalloc(sizeof(*nd), M_IP6NDP,
156 M_WAITOK | M_ZERO);
157
158 nd->initialized = 1;
159
160 nd->linkmtu = ifindex2ifnet[ifp->if_index]->if_mtu;
161 nd->chlim = IPV6_DEFHLIM;
162 nd->basereachable = REACHABLE_TIME;
163 nd->reachable = ND_COMPUTE_RTIME(nd->basereachable);
164 nd->retrans = RETRANS_TIMER;
165 nd->receivedra = 0;
166
167 /*
168 * Note that the default value of ip6_accept_rtadv is 0, which means
169 * we won't accept RAs by default even if we set ND6_IFF_ACCEPT_RTADV
170 * here.
171 */
172 nd->flags = (ND6_IFF_PERFORMNUD | ND6_IFF_ACCEPT_RTADV);
173
174 /* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */
175 nd6_setmtu0(ifp, nd);
176 return nd;
177 }
178
179 void
180 nd6_ifdetach(struct nd_ifinfo *nd)
181 {
182 kfree(nd, M_IP6NDP);
183 }
184
185 /*
186 * Reset ND level link MTU. This function is called when the physical MTU
187 * changes, which means we might have to adjust the ND level MTU.
188 */
189 void
190 nd6_setmtu(struct ifnet *ifp)
191 {
192 nd6_setmtu0(ifp, ND_IFINFO(ifp));
193 }
194
195 /* XXX todo: do not maintain copy of ifp->if_mtu in ndi->maxmtu */
196 void
197 nd6_setmtu0(struct ifnet *ifp, struct nd_ifinfo *ndi)
198 {
199 u_long oldmaxmtu;
200 u_long oldlinkmtu;
201
202 oldmaxmtu = ndi->maxmtu;
203 oldlinkmtu = ndi->linkmtu;
204
205 switch (ifp->if_type) {
206 case IFT_ETHER:
207 ndi->maxmtu = MIN(ETHERMTU, ifp->if_mtu);
208 break;
209 case IFT_ATM:
210 ndi->maxmtu = MIN(ATMMTU, ifp->if_mtu);
211 break;
212 case IFT_IEEE1394: /* XXX should be IEEE1394MTU(1500) */
213 ndi->maxmtu = MIN(ETHERMTU, ifp->if_mtu);
214 break;
215 #ifdef IFT_IEEE80211
216 case IFT_IEEE80211: /* XXX should be IEEE80211MTU(1500) */
217 ndi->maxmtu = MIN(ETHERMTU, ifp->if_mtu);
218 break;
219 #endif
220 default:
221 ndi->maxmtu = ifp->if_mtu;
222 break;
223 }
224
225 if (oldmaxmtu != ndi->maxmtu) {
226 /*
227 * If the ND level MTU is not set yet, or if the maxmtu
228 * is reset to a smaller value than the ND level MTU,
229 * also reset the ND level MTU.
230 */
231 if (ndi->linkmtu == 0 ||
232 ndi->maxmtu < ndi->linkmtu) {
233 ndi->linkmtu = ndi->maxmtu;
234 /* also adjust in6_maxmtu if necessary. */
235 if (oldlinkmtu == 0) {
236 /*
237 * XXX: the case analysis is grotty, but
238 * it is not efficient to call in6_setmaxmtu()
239 * here when we are during the initialization
240 * procedure.
241 */
242 if (in6_maxmtu < ndi->linkmtu)
243 in6_maxmtu = ndi->linkmtu;
244 } else
245 in6_setmaxmtu();
246 }
247 }
248 #undef MIN
249 }
250
251 void
252 nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts)
253 {
254 bzero(ndopts, sizeof(*ndopts));
255 ndopts->nd_opts_search = (struct nd_opt_hdr *)opt;
256 ndopts->nd_opts_last
257 = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len);
258
259 if (icmp6len == 0) {
260 ndopts->nd_opts_done = 1;
261 ndopts->nd_opts_search = NULL;
262 }
263 }
264
265 /*
266 * Take one ND option.
267 */
268 struct nd_opt_hdr *
269 nd6_option(union nd_opts *ndopts)
270 {
271 struct nd_opt_hdr *nd_opt;
272 int olen;
273
274 if (!ndopts)
275 panic("ndopts == NULL in nd6_option");
276 if (!ndopts->nd_opts_last)
277 panic("uninitialized ndopts in nd6_option");
278 if (!ndopts->nd_opts_search)
279 return NULL;
280 if (ndopts->nd_opts_done)
281 return NULL;
282
283 nd_opt = ndopts->nd_opts_search;
284
285 /* make sure nd_opt_len is inside the buffer */
286 if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) {
287 bzero(ndopts, sizeof(*ndopts));
288 return NULL;
289 }
290
291 olen = nd_opt->nd_opt_len << 3;
292 if (olen == 0) {
293 /*
294 * Message validation requires that all included
295 * options have a length that is greater than zero.
296 */
297 bzero(ndopts, sizeof(*ndopts));
298 return NULL;
299 }
300
301 ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen);
302 if (ndopts->nd_opts_search > ndopts->nd_opts_last) {
303 /* option overruns the end of buffer, invalid */
304 bzero(ndopts, sizeof(*ndopts));
305 return NULL;
306 } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) {
307 /* reached the end of options chain */
308 ndopts->nd_opts_done = 1;
309 ndopts->nd_opts_search = NULL;
310 }
311 return nd_opt;
312 }
313
314 /*
315 * Parse multiple ND options.
316 * This function is much easier to use, for ND routines that do not need
317 * multiple options of the same type.
318 */
319 int
320 nd6_options(union nd_opts *ndopts)
321 {
322 struct nd_opt_hdr *nd_opt;
323 int i = 0;
324
325 if (!ndopts)
326 panic("ndopts == NULL in nd6_options");
327 if (!ndopts->nd_opts_last)
328 panic("uninitialized ndopts in nd6_options");
329 if (!ndopts->nd_opts_search)
330 return 0;
331
332 while (1) {
333 nd_opt = nd6_option(ndopts);
334 if (!nd_opt && !ndopts->nd_opts_last) {
335 /*
336 * Message validation requires that all included
337 * options have a length that is greater than zero.
338 */
339 icmp6stat.icp6s_nd_badopt++;
340 bzero(ndopts, sizeof(*ndopts));
341 return -1;
342 }
343
344 if (!nd_opt)
345 goto skip1;
346
347 switch (nd_opt->nd_opt_type) {
348 case ND_OPT_SOURCE_LINKADDR:
349 case ND_OPT_TARGET_LINKADDR:
350 case ND_OPT_MTU:
351 case ND_OPT_REDIRECTED_HEADER:
352 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
353 nd6log((LOG_INFO,
354 "duplicated ND6 option found (type=%d)\n",
355 nd_opt->nd_opt_type));
356 /* XXX bark? */
357 } else {
358 ndopts->nd_opt_array[nd_opt->nd_opt_type]
359 = nd_opt;
360 }
361 break;
362 case ND_OPT_PREFIX_INFORMATION:
363 if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) {
364 ndopts->nd_opt_array[nd_opt->nd_opt_type]
365 = nd_opt;
366 }
367 ndopts->nd_opts_pi_end =
368 (struct nd_opt_prefix_info *)nd_opt;
369 break;
370 default:
371 /*
372 * Unknown options must be silently ignored,
373 * to accomodate future extension to the protocol.
374 */
375 nd6log((LOG_DEBUG,
376 "nd6_options: unsupported option %d - "
377 "option ignored\n", nd_opt->nd_opt_type));
378 }
379
380 skip1:
381 i++;
382 if (i > nd6_maxndopt) {
383 icmp6stat.icp6s_nd_toomanyopt++;
384 nd6log((LOG_INFO, "too many loop in nd opt\n"));
385 break;
386 }
387
388 if (ndopts->nd_opts_done)
389 break;
390 }
391
392 return 0;
393 }
394
395 /*
396 * ND6 timer routine to expire default route list and prefix list
397 */
398 void
399 nd6_timer(void *ignored_arg)
400 {
401 struct llinfo_nd6 *ln;
402 struct nd_defrouter *dr;
403 struct nd_prefix *pr;
404 struct ifnet *ifp;
405 struct in6_ifaddr *ia6, *nia6;
406 struct in6_addrlifetime *lt6;
407
408 crit_enter();
409 callout_reset(&nd6_timer_ch, nd6_prune * hz,
410 nd6_timer, NULL);
411
412 ln = llinfo_nd6.ln_next;
413 while (ln && ln != &llinfo_nd6) {
414 struct rtentry *rt;
415 struct sockaddr_in6 *dst;
416 struct llinfo_nd6 *next = ln->ln_next;
417 /* XXX: used for the DELAY case only: */
418 struct nd_ifinfo *ndi = NULL;
419
420 if ((rt = ln->ln_rt) == NULL) {
421 ln = next;
422 continue;
423 }
424 if ((ifp = rt->rt_ifp) == NULL) {
425 ln = next;
426 continue;
427 }
428 ndi = ND_IFINFO(ifp);
429 dst = (struct sockaddr_in6 *)rt_key(rt);
430
431 if (ln->ln_expire > time_second) {
432 ln = next;
433 continue;
434 }
435
436 /* sanity check */
437 if (!rt)
438 panic("rt=0 in nd6_timer(ln=%p)", ln);
439 if (rt->rt_llinfo && (struct llinfo_nd6 *)rt->rt_llinfo != ln)
440 panic("rt_llinfo(%p) is not equal to ln(%p)",
441 rt->rt_llinfo, ln);
442 if (!dst)
443 panic("dst=0 in nd6_timer(ln=%p)", ln);
444
445 switch (ln->ln_state) {
446 case ND6_LLINFO_INCOMPLETE:
447 if (ln->ln_asked < nd6_mmaxtries) {
448 ln->ln_asked++;
449 ln->ln_expire = time_second +
450 ND_IFINFO(ifp)->retrans / 1000;
451 nd6_ns_output(ifp, NULL, &dst->sin6_addr,
452 ln, 0);
453 } else {
454 struct mbuf *m = ln->ln_hold;
455 if (m) {
456 if (rt->rt_ifp) {
457 /*
458 * Fake rcvif to make ICMP error
459 * more helpful in diagnosing
460 * for the receiver.
461 * XXX: should we consider
462 * older rcvif?
463 */
464 m->m_pkthdr.rcvif = rt->rt_ifp;
465 }
466 icmp6_error(m, ICMP6_DST_UNREACH,
467 ICMP6_DST_UNREACH_ADDR, 0);
468 ln->ln_hold = NULL;
469 }
470 next = nd6_free(rt);
471 }
472 break;
473 case ND6_LLINFO_REACHABLE:
474 if (ln->ln_expire) {
475 ln->ln_state = ND6_LLINFO_STALE;
476 ln->ln_expire = time_second + nd6_gctimer;
477 }
478 break;
479
480 case ND6_LLINFO_STALE:
481 /* Garbage Collection(RFC 2461 5.3) */
482 if (ln->ln_expire)
483 next = nd6_free(rt);
484 break;
485
486 case ND6_LLINFO_DELAY:
487 if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD)) {
488 /* We need NUD */
489 ln->ln_asked = 1;
490 ln->ln_state = ND6_LLINFO_PROBE;
491 ln->ln_expire = time_second +
492 ndi->retrans / 1000;
493 nd6_ns_output(ifp, &dst->sin6_addr,
494 &dst->sin6_addr,
495 ln, 0);
496 } else {
497 ln->ln_state = ND6_LLINFO_STALE; /* XXX */
498 ln->ln_expire = time_second + nd6_gctimer;
499 }
500 break;
501 case ND6_LLINFO_PROBE:
502 if (ln->ln_asked < nd6_umaxtries) {
503 ln->ln_asked++;
504 ln->ln_expire = time_second +
505 ND_IFINFO(ifp)->retrans / 1000;
506 nd6_ns_output(ifp, &dst->sin6_addr,
507 &dst->sin6_addr, ln, 0);
508 } else {
509 next = nd6_free(rt);
510 }
511 break;
512 }
513 ln = next;
514 }
515
516 /* expire default router list */
517 dr = TAILQ_FIRST(&nd_defrouter);
518 while (dr) {
519 if (dr->expire && dr->expire < time_second) {
520 struct nd_defrouter *t;
521 t = TAILQ_NEXT(dr, dr_entry);
522 defrtrlist_del(dr);
523 dr = t;
524 } else {
525 dr = TAILQ_NEXT(dr, dr_entry);
526 }
527 }
528
529 /*
530 * expire interface addresses.
531 * in the past the loop was inside prefix expiry processing.
532 * However, from a stricter speci-confrmance standpoint, we should
533 * rather separate address lifetimes and prefix lifetimes.
534 */
535 addrloop:
536 for (ia6 = in6_ifaddr; ia6; ia6 = nia6) {
537 nia6 = ia6->ia_next;
538 /* check address lifetime */
539 lt6 = &ia6->ia6_lifetime;
540 if (IFA6_IS_INVALID(ia6)) {
541 int regen = 0;
542
543 /*
544 * If the expiring address is temporary, try
545 * regenerating a new one. This would be useful when
546 * we suspended a laptop PC, then turned it on after a
547 * period that could invalidate all temporary
548 * addresses. Although we may have to restart the
549 * loop (see below), it must be after purging the
550 * address. Otherwise, we'd see an infinite loop of
551 * regeneration.
552 */
553 if (ip6_use_tempaddr &&
554 (ia6->ia6_flags & IN6_IFF_TEMPORARY)) {
555 if (regen_tmpaddr(ia6) == 0)
556 regen = 1;
557 }
558
559 in6_purgeaddr(&ia6->ia_ifa);
560
561 if (regen)
562 goto addrloop; /* XXX: see below */
563 }
564 if (IFA6_IS_DEPRECATED(ia6)) {
565 int oldflags = ia6->ia6_flags;
566
567 ia6->ia6_flags |= IN6_IFF_DEPRECATED;
568
569 /*
570 * If a temporary address has just become deprecated,
571 * regenerate a new one if possible.
572 */
573 if (ip6_use_tempaddr &&
574 (ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
575 !(oldflags & IN6_IFF_DEPRECATED)) {
576
577 if (regen_tmpaddr(ia6) == 0) {
578 /*
579 * A new temporary address is
580 * generated.
581 * XXX: this means the address chain
582 * has changed while we are still in
583 * the loop. Although the change
584 * would not cause disaster (because
585 * it's not a deletion, but an
586 * addition,) we'd rather restart the
587 * loop just for safety. Or does this
588 * significantly reduce performance??
589 */
590 goto addrloop;
591 }
592 }
593 } else {
594 /*
595 * A new RA might have made a deprecated address
596 * preferred.
597 */
598 ia6->ia6_flags &= ~IN6_IFF_DEPRECATED;
599 }
600 }
601
602 /* expire prefix list */
603 pr = nd_prefix.lh_first;
604 while (pr) {
605 /*
606 * check prefix lifetime.
607 * since pltime is just for autoconf, pltime processing for
608 * prefix is not necessary.
609 */
610 if (pr->ndpr_expire && pr->ndpr_expire < time_second) {
611 struct nd_prefix *t;
612 t = pr->ndpr_next;
613
614 /*
615 * address expiration and prefix expiration are
616 * separate. NEVER perform in6_purgeaddr here.
617 */
618
619 prelist_remove(pr);
620 pr = t;
621 } else
622 pr = pr->ndpr_next;
623 }
624 crit_exit();
625 }
626
627 static int
628 regen_tmpaddr(struct in6_ifaddr *ia6) /* deprecated/invalidated temporary
629 address */
630 {
631 struct ifaddr *ifa;
632 struct ifnet *ifp;
633 struct in6_ifaddr *public_ifa6 = NULL;
634
635 ifp = ia6->ia_ifa.ifa_ifp;
636 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_list) {
637 struct in6_ifaddr *it6;
638
639 if (ifa->ifa_addr->sa_family != AF_INET6)
640 continue;
641
642 it6 = (struct in6_ifaddr *)ifa;
643
644 /* ignore no autoconf addresses. */
645 if (!(it6->ia6_flags & IN6_IFF_AUTOCONF))
646 continue;
647
648 /* ignore autoconf addresses with different prefixes. */
649 if (it6->ia6_ndpr == NULL || it6->ia6_ndpr != ia6->ia6_ndpr)
650 continue;
651
652 /*
653 * Now we are looking at an autoconf address with the same
654 * prefix as ours. If the address is temporary and is still
655 * preferred, do not create another one. It would be rare, but
656 * could happen, for example, when we resume a laptop PC after
657 * a long period.
658 */
659 if ((it6->ia6_flags & IN6_IFF_TEMPORARY) &&
660 !IFA6_IS_DEPRECATED(it6)) {
661 public_ifa6 = NULL;
662 break;
663 }
664
665 /*
666 * This is a public autoconf address that has the same prefix
667 * as ours. If it is preferred, keep it. We can't break the
668 * loop here, because there may be a still-preferred temporary
669 * address with the prefix.
670 */
671 if (!IFA6_IS_DEPRECATED(it6))
672 public_ifa6 = it6;
673 }
674
675 if (public_ifa6 != NULL) {
676 int e;
677
678 if ((e = in6_tmpifadd(public_ifa6, 0)) != 0) {
679 log(LOG_NOTICE, "regen_tmpaddr: failed to create a new"
680 " tmp addr,errno=%d\n", e);
681 return (-1);
682 }
683 return (0);
684 }
685
686 return (-1);
687 }
688
689 /*
690 * Nuke neighbor cache/prefix/default router management table, right before
691 * ifp goes away.
692 */
693 void
694 nd6_purge(struct ifnet *ifp)
695 {
696 struct llinfo_nd6 *ln, *nln;
697 struct nd_defrouter *dr, *ndr, drany;
698 struct nd_prefix *pr, *npr;
699
700 /* Nuke default router list entries toward ifp */
701 if ((dr = TAILQ_FIRST(&nd_defrouter)) != NULL) {
702 /*
703 * The first entry of the list may be stored in
704 * the routing table, so we'll delete it later.
705 */
706 for (dr = TAILQ_NEXT(dr, dr_entry); dr; dr = ndr) {
707 ndr = TAILQ_NEXT(dr, dr_entry);
708 if (dr->ifp == ifp)
709 defrtrlist_del(dr);
710 }
711 dr = TAILQ_FIRST(&nd_defrouter);
712 if (dr->ifp == ifp)
713 defrtrlist_del(dr);
714 }
715
716 /* Nuke prefix list entries toward ifp */
717 for (pr = nd_prefix.lh_first; pr; pr = npr) {
718 npr = pr->ndpr_next;
719 if (pr->ndpr_ifp == ifp) {
720 /*
721 * Previously, pr->ndpr_addr is removed as well,
722 * but I strongly believe we don't have to do it.
723 * nd6_purge() is only called from in6_ifdetach(),
724 * which removes all the associated interface addresses
725 * by itself.
726 * (jinmei@kame.net 20010129)
727 */
728 prelist_remove(pr);
729 }
730 }
731
732 /* cancel default outgoing interface setting */
733 if (nd6_defifindex == ifp->if_index)
734 nd6_setdefaultiface(0);
735
736 if (!ip6_forwarding && ip6_accept_rtadv) { /* XXX: too restrictive? */
737 /* refresh default router list */
738 bzero(&drany, sizeof(drany));
739 defrouter_delreq(&drany, 0);
740 defrouter_select();
741 }
742
743 /*
744 * Nuke neighbor cache entries for the ifp.
745 * Note that rt->rt_ifp may not be the same as ifp,
746 * due to KAME goto ours hack. See RTM_RESOLVE case in
747 * nd6_rtrequest(), and ip6_input().
748 */
749 ln = llinfo_nd6.ln_next;
750 while (ln && ln != &llinfo_nd6) {
751 struct rtentry *rt;
752 struct sockaddr_dl *sdl;
753
754 nln = ln->ln_next;
755 rt = ln->ln_rt;
756 if (rt && rt->rt_gateway &&
757 rt->rt_gateway->sa_family == AF_LINK) {
758 sdl = (struct sockaddr_dl *)rt->rt_gateway;
759 if (sdl->sdl_index == ifp->if_index)
760 nln = nd6_free(rt);
761 }
762 ln = nln;
763 }
764 }
765
766 struct rtentry *
767 nd6_lookup(struct in6_addr *addr6, int create, struct ifnet *ifp)
768 {
769 struct rtentry *rt;
770 struct sockaddr_in6 sin6;
771
772 bzero(&sin6, sizeof(sin6));
773 sin6.sin6_len = sizeof(struct sockaddr_in6);
774 sin6.sin6_family = AF_INET6;
775 sin6.sin6_addr = *addr6;
776
777 if (create)
778 rt = rtlookup((struct sockaddr *)&sin6);
779 else
780 rt = rtpurelookup((struct sockaddr *)&sin6);
781 if (rt && !(rt->rt_flags & RTF_LLINFO)) {
782 /*
783 * This is the case for the default route.
784 * If we want to create a neighbor cache for the address, we
785 * should free the route for the destination and allocate an
786 * interface route.
787 */
788 if (create) {
789 --rt->rt_refcnt;
790 rt = NULL;
791 }
792 }
793 if (!rt) {
794 if (create && ifp) {
795 int e;
796
797 /*
798 * If no route is available and create is set,
799 * we allocate a host route for the destination
800 * and treat it like an interface route.
801 * This hack is necessary for a neighbor which can't
802 * be covered by our own prefix.
803 */
804 struct ifaddr *ifa =
805 ifaof_ifpforaddr((struct sockaddr *)&sin6, ifp);
806 if (ifa == NULL)
807 return (NULL);
808
809 /*
810 * Create a new route. RTF_LLINFO is necessary
811 * to create a Neighbor Cache entry for the
812 * destination in nd6_rtrequest which will be
813 * called in rtrequest via ifa->ifa_rtrequest.
814 */
815 if ((e = rtrequest(RTM_ADD, (struct sockaddr *)&sin6,
816 ifa->ifa_addr,
817 (struct sockaddr *)&all1_sa,
818 (ifa->ifa_flags |
819 RTF_HOST | RTF_LLINFO) &
820 ~RTF_CLONING,
821 &rt)) != 0)
822 log(LOG_ERR,
823 "nd6_lookup: failed to add route for a "
824 "neighbor(%s), errno=%d\n",
825 ip6_sprintf(addr6), e);
826 if (rt == NULL)
827 return (NULL);
828 if (rt->rt_llinfo) {
829 struct llinfo_nd6 *ln =
830 (struct llinfo_nd6 *)rt->rt_llinfo;
831 ln->ln_state = ND6_LLINFO_NOSTATE;
832 }
833 } else
834 return (NULL);
835 }
836 rt->rt_refcnt--;
837 /*
838 * Validation for the entry.
839 * Note that the check for rt_llinfo is necessary because a cloned
840 * route from a parent route that has the L flag (e.g. the default
841 * route to a p2p interface) may have the flag, too, while the
842 * destination is not actually a neighbor.
843 * XXX: we can't use rt->rt_ifp to check for the interface, since
844 * it might be the loopback interface if the entry is for our
845 * own address on a non-loopback interface. Instead, we should
846 * use rt->rt_ifa->ifa_ifp, which would specify the REAL
847 * interface.
848 */
849 if ((rt->rt_flags & RTF_GATEWAY) || !(rt->rt_flags & RTF_LLINFO) ||
850 rt->rt_gateway->sa_family != AF_LINK || rt->rt_llinfo == NULL ||
851 (ifp && rt->rt_ifa->ifa_ifp != ifp)) {
852 if (create) {
853 log(LOG_DEBUG, "nd6_lookup: failed to lookup %s (if = %s)\n",
854 ip6_sprintf(addr6), ifp ? if_name(ifp) : "unspec");
855 /* xxx more logs... kazu */
856 }
857 return (NULL);
858 }
859 return (rt);
860 }
861
862 /*
863 * Detect if a given IPv6 address identifies a neighbor on a given link.
864 * XXX: should take care of the destination of a p2p link?
865 */
866 int
867 nd6_is_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp)
868 {
869 struct ifaddr *ifa;
870 int i;
871
872 #define IFADDR6(a) ((((struct in6_ifaddr *)(a))->ia_addr).sin6_addr)
873 #define IFMASK6(a) ((((struct in6_ifaddr *)(a))->ia_prefixmask).sin6_addr)
874
875 /*
876 * A link-local address is always a neighbor.
877 * XXX: we should use the sin6_scope_id field rather than the embedded
878 * interface index.
879 */
880 if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr) &&
881 ntohs(*(u_int16_t *)&addr->sin6_addr.s6_addr[2]) == ifp->if_index)
882 return (1);
883
884 /*
885 * If the address matches one of our addresses,
886 * it should be a neighbor.
887 */
888 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
889 if (ifa->ifa_addr->sa_family != AF_INET6)
890 next: continue;
891
892 for (i = 0; i < 4; i++) {
893 if ((IFADDR6(ifa).s6_addr32[i] ^
894 addr->sin6_addr.s6_addr32[i]) &
895 IFMASK6(ifa).s6_addr32[i])
896 goto next;
897 }
898 return (1);
899 }
900
901 /*
902 * Even if the address matches none of our addresses, it might be
903 * in the neighbor cache.
904 */
905 if (nd6_lookup(&addr->sin6_addr, 0, ifp) != NULL)
906 return (1);
907
908 return (0);
909 #undef IFADDR6
910 #undef IFMASK6
911 }
912
913 /*
914 * Free an nd6 llinfo entry.
915 */
916 struct llinfo_nd6 *
917 nd6_free(struct rtentry *rt)
918 {
919 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo, *next;
920 struct in6_addr in6 = ((struct sockaddr_in6 *)rt_key(rt))->sin6_addr;
921 struct nd_defrouter *dr;
922
923 /*
924 * we used to have pfctlinput(PRC_HOSTDEAD) here.
925 * even though it is not harmful, it was not really necessary.
926 */
927
928 if (!ip6_forwarding && ip6_accept_rtadv) { /* XXX: too restrictive? */
929 crit_enter();
930 dr = defrouter_lookup(&((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
931 rt->rt_ifp);
932
933 if (ln->ln_router || dr) {
934 /*
935 * rt6_flush must be called whether or not the neighbor
936 * is in the Default Router List.
937 * See a corresponding comment in nd6_na_input().
938 */
939 rt6_flush(&in6, rt->rt_ifp);
940 }
941
942 if (dr) {
943 /*
944 * Unreachablity of a router might affect the default
945 * router selection and on-link detection of advertised
946 * prefixes.
947 */
948
949 /*
950 * Temporarily fake the state to choose a new default
951 * router and to perform on-link determination of
952 * prefixes correctly.
953 * Below the state will be set correctly,
954 * or the entry itself will be deleted.
955 */
956 ln->ln_state = ND6_LLINFO_INCOMPLETE;
957
958 /*
959 * Since defrouter_select() does not affect the
960 * on-link determination and MIP6 needs the check
961 * before the default router selection, we perform
962 * the check now.
963 */
964 pfxlist_onlink_check();
965
966 if (dr == TAILQ_FIRST(&nd_defrouter)) {
967 /*
968 * It is used as the current default router,
969 * so we have to move it to the end of the
970 * list and choose a new one.
971 * XXX: it is not very efficient if this is
972 * the only router.
973 */
974 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
975 TAILQ_INSERT_TAIL(&nd_defrouter, dr, dr_entry);
976
977 defrouter_select();
978 }
979 }
980 crit_exit();
981 }
982
983 /*
984 * Before deleting the entry, remember the next entry as the
985 * return value. We need this because pfxlist_onlink_check() above
986 * might have freed other entries (particularly the old next entry) as
987 * a side effect (XXX).
988 */
989 next = ln->ln_next;
990
991 /*
992 * Detach the route from the routing tree and the list of neighbor
993 * caches, and disable the route entry not to be used in already
994 * cached routes.
995 */
996 rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0,
997 rt_mask(rt), 0, (struct rtentry **)0);
998
999 return (next);
1000 }
1001
1002 /*
1003 * Upper-layer reachability hint for Neighbor Unreachability Detection.
1004 *
1005 * XXX cost-effective metods?
1006 */
1007 void
1008 nd6_nud_hint(struct rtentry *rt, struct in6_addr *dst6, int force)
1009 {
1010 struct llinfo_nd6 *ln;
1011
1012 /*
1013 * If the caller specified "rt", use that. Otherwise, resolve the
1014 * routing table by supplied "dst6".
1015 */
1016 if (!rt) {
1017 if (!dst6)
1018 return;
1019 if (!(rt = nd6_lookup(dst6, 0, NULL)))
1020 return;
1021 }
1022
1023 if ((rt->rt_flags & RTF_GATEWAY) ||
1024 !(rt->rt_flags & RTF_LLINFO) ||
1025 rt->rt_llinfo == NULL || rt->rt_gateway == NULL ||
1026 rt->rt_gateway->sa_family != AF_LINK) {
1027 /* This is not a host route. */
1028 return;
1029 }
1030
1031 ln = (struct llinfo_nd6 *)rt->rt_llinfo;
1032 if (ln->ln_state < ND6_LLINFO_REACHABLE)
1033 return;
1034
1035 /*
1036 * if we get upper-layer reachability confirmation many times,
1037 * it is possible we have false information.
1038 */
1039 if (!force) {
1040 ln->ln_byhint++;
1041 if (ln->ln_byhint > nd6_maxnudhint)
1042 return;
1043 }
1044
1045 ln->ln_state = ND6_LLINFO_REACHABLE;
1046 if (ln->ln_expire)
1047 ln->ln_expire = time_second +
1048 ND_IFINFO(rt->rt_ifp)->reachable;
1049 }
1050
1051 void
1052 nd6_rtrequest(int req, struct rtentry *rt,
1053 struct rt_addrinfo *info) /* xxx unused */
1054 {
1055 struct sockaddr *gate = rt->rt_gateway;
1056 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo;
1057 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
1058 struct ifnet *ifp = rt->rt_ifp;
1059 struct ifaddr *ifa;
1060
1061 if ((rt->rt_flags & RTF_GATEWAY))
1062 return;
1063
1064 if (nd6_need_cache(ifp) == 0 && !(rt->rt_flags & RTF_HOST)) {
1065 /*
1066 * This is probably an interface direct route for a link
1067 * which does not need neighbor caches (e.g. fe80::%lo0/64).
1068 * We do not need special treatment below for such a route.
1069 * Moreover, the RTF_LLINFO flag which would be set below
1070 * would annoy the ndp(8) command.
1071 */
1072 return;
1073 }
1074
1075 if (req == RTM_RESOLVE &&
1076 (nd6_need_cache(ifp) == 0 || /* stf case */
1077 !nd6_is_addr_neighbor((struct sockaddr_in6 *)rt_key(rt), ifp))) {
1078 /*
1079 * FreeBSD and BSD/OS often make a cloned host route based
1080 * on a less-specific route (e.g. the default route).
1081 * If the less specific route does not have a "gateway"
1082 * (this is the case when the route just goes to a p2p or an
1083 * stf interface), we'll mistakenly make a neighbor cache for
1084 * the host route, and will see strange neighbor solicitation
1085 * for the corresponding destination. In order to avoid the
1086 * confusion, we check if the destination of the route is
1087 * a neighbor in terms of neighbor discovery, and stop the
1088 * process if not. Additionally, we remove the LLINFO flag
1089 * so that ndp(8) will not try to get the neighbor information
1090 * of the destination.
1091 */
1092 rt->rt_flags &= ~RTF_LLINFO;
1093 return;
1094 }
1095
1096 switch (req) {
1097 case RTM_ADD:
1098 /*
1099 * There is no backward compatibility :)
1100 *
1101 * if (!(rt->rt_flags & RTF_HOST) &&
1102 * SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff)
1103 * rt->rt_flags |= RTF_CLONING;
1104 */
1105 if (rt->rt_flags & (RTF_CLONING | RTF_LLINFO)) {
1106 /*
1107 * Case 1: This route should come from
1108 * a route to interface. RTF_LLINFO flag is set
1109 * for a host route whose destination should be
1110 * treated as on-link.
1111 */
1112 rt_setgate(rt, rt_key(rt),
1113 (struct sockaddr *)&null_sdl);
1114 gate = rt->rt_gateway;
1115 SDL(gate)->sdl_type = ifp->if_type;
1116 SDL(gate)->sdl_index = ifp->if_index;
1117 if (ln)
1118 ln->ln_expire = time_second;
1119 #if 1
1120 if (ln && ln->ln_expire == 0) {
1121 /* kludge for desktops */
1122 #if 0
1123 kprintf("nd6_rtequest: time.tv_sec is zero; "
1124 "treat it as 1\n");
1125 #endif
1126 ln->ln_expire = 1;
1127 }
1128 #endif
1129 if ((rt->rt_flags & RTF_CLONING))
1130 break;
1131 }
1132 /*
1133 * In IPv4 code, we try to annonuce new RTF_ANNOUNCE entry here.
1134 * We don't do that here since llinfo is not ready yet.
1135 *
1136 * There are also couple of other things to be discussed:
1137 * - unsolicited NA code needs improvement beforehand
1138 * - RFC2461 says we MAY send multicast unsolicited NA
1139 * (7.2.6 paragraph 4), however, it also says that we
1140 * SHOULD provide a mechanism to prevent multicast NA storm.
1141 * we don't have anything like it right now.
1142 * note that the mechanism needs a mutual agreement
1143 * between proxies, which means that we need to implement
1144 * a new protocol, or a new kludge.
1145 * - from RFC2461 6.2.4, host MUST NOT send an unsolicited NA.
1146 * we need to check ip6forwarding before sending it.
1147 * (or should we allow proxy ND configuration only for
1148 * routers? there's no mention about proxy ND from hosts)
1149 */
1150 #if 0
1151 /* XXX it does not work */
1152 if (rt->rt_flags & RTF_ANNOUNCE)
1153 nd6_na_output(ifp,
1154 &SIN6(rt_key(rt))->sin6_addr,
1155 &SIN6(rt_key(rt))->sin6_addr,
1156 ip6_forwarding ? ND_NA_FLAG_ROUTER : 0,
1157 1, NULL);
1158 #endif
1159 /* FALLTHROUGH */
1160 case RTM_RESOLVE:
1161 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) {
1162 /*
1163 * Address resolution isn't necessary for a point to
1164 * point link, so we can skip this test for a p2p link.
1165 */
1166 if (gate->sa_family != AF_LINK ||
1167 gate->sa_len < sizeof(null_sdl)) {
1168 log(LOG_DEBUG,
1169 "nd6_rtrequest: bad gateway value: %s\n",
1170 if_name(ifp));
1171 break;
1172 }
1173 SDL(gate)->sdl_type = ifp->if_type;
1174 SDL(gate)->sdl_index = ifp->if_index;
1175 }
1176 if (ln != NULL)
1177 break; /* This happens on a route change */
1178 /*
1179 * Case 2: This route may come from cloning, or a manual route
1180 * add with a LL address.
1181 */
1182 R_Malloc(ln, struct llinfo_nd6 *, sizeof(*ln));
1183 rt->rt_llinfo = (caddr_t)ln;
1184 if (!ln) {
1185 log(LOG_DEBUG, "nd6_rtrequest: malloc failed\n");
1186 break;
1187 }
1188 nd6_inuse++;
1189 nd6_allocated++;
1190 bzero(ln, sizeof(*ln));
1191 ln->ln_rt = rt;
1192 /* this is required for "ndp" command. - shin */
1193 if (req == RTM_ADD) {
1194 /*
1195 * gate should have some valid AF_LINK entry,
1196 * and ln->ln_expire should have some lifetime
1197 * which is specified by ndp command.
1198 */
1199 ln->ln_state = ND6_LLINFO_REACHABLE;
1200 ln->ln_byhint = 0;
1201 } else {
1202 /*
1203 * When req == RTM_RESOLVE, rt is created and
1204 * initialized in rtrequest(), so rt_expire is 0.
1205 */
1206 ln->ln_state = ND6_LLINFO_NOSTATE;
1207 ln->ln_expire = time_second;
1208 }
1209 rt->rt_flags |= RTF_LLINFO;
1210 ln->ln_next = llinfo_nd6.ln_next;
1211 llinfo_nd6.ln_next = ln;
1212 ln->ln_prev = &llinfo_nd6;
1213 ln->ln_next->ln_prev = ln;
1214
1215 /*
1216 * check if rt_key(rt) is one of my address assigned
1217 * to the interface.
1218 */
1219 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(rt->rt_ifp,
1220 &SIN6(rt_key(rt))->sin6_addr);
1221 if (ifa) {
1222 caddr_t macp = nd6_ifptomac(ifp);
1223 ln->ln_expire = 0;
1224 ln->ln_state = ND6_LLINFO_REACHABLE;
1225 ln->ln_byhint = 0;
1226 if (macp) {
1227 bcopy(macp, LLADDR(SDL(gate)), ifp->if_addrlen);
1228 SDL(gate)->sdl_alen = ifp->if_addrlen;
1229 }
1230 if (nd6_useloopback) {
1231 rt->rt_ifp = &loif[0]; /* XXX */
1232 /*
1233 * Make sure rt_ifa be equal to the ifaddr
1234 * corresponding to the address.
1235 * We need this because when we refer
1236 * rt_ifa->ia6_flags in ip6_input, we assume
1237 * that the rt_ifa points to the address instead
1238 * of the loopback address.
1239 */
1240 if (ifa != rt->rt_ifa) {
1241 IFAFREE(rt->rt_ifa);
1242 IFAREF(ifa);
1243 rt->rt_ifa = ifa;
1244 }
1245 }
1246 } else if (rt->rt_flags & RTF_ANNOUNCE) {
1247 ln->ln_expire = 0;
1248 ln->ln_state = ND6_LLINFO_REACHABLE;
1249 ln->ln_byhint = 0;
1250
1251 /* join solicited node multicast for proxy ND */
1252 if (ifp->if_flags & IFF_MULTICAST) {
1253 struct in6_addr llsol;
1254 int error;
1255
1256 llsol = SIN6(rt_key(rt))->sin6_addr;
1257 llsol.s6_addr16[0] = htons(0xff02);
1258 llsol.s6_addr16[1] = htons(ifp->if_index);
1259 llsol.s6_addr32[1] = 0;
1260 llsol.s6_addr32[2] = htonl(1);
1261 llsol.s6_addr8[12] = 0xff;
1262
1263 if (!in6_addmulti(&llsol, ifp, &error)) {
1264 nd6log((LOG_ERR, "%s: failed to join "
1265 "%s (errno=%d)\n", if_name(ifp),
1266 ip6_sprintf(&llsol), error));
1267 }
1268 }
1269 }
1270 break;
1271
1272 case RTM_DELETE:
1273 if (!ln)
1274 break;
1275 /* leave from solicited node multicast for proxy ND */
1276 if ((rt->rt_flags & RTF_ANNOUNCE) &&
1277 (ifp->if_flags & IFF_MULTICAST)) {
1278 struct in6_addr llsol;
1279 struct in6_multi *in6m;
1280
1281 llsol = SIN6(rt_key(rt))->sin6_addr;
1282 llsol.s6_addr16[0] = htons(0xff02);
1283 llsol.s6_addr16[1] = htons(ifp->if_index);
1284 llsol.s6_addr32[1] = 0;
1285 llsol.s6_addr32[2] = htonl(1);
1286 llsol.s6_addr8[12] = 0xff;
1287
1288 IN6_LOOKUP_MULTI(llsol, ifp, in6m);
1289 if (in6m)
1290 in6_delmulti(in6m);
1291 }
1292 nd6_inuse--;
1293 ln->ln_next->ln_prev = ln->ln_prev;
1294 ln->ln_prev->ln_next = ln->ln_next;
1295 ln->ln_prev = NULL;
1296 rt->rt_llinfo = 0;
1297 rt->rt_flags &= ~RTF_LLINFO;
1298 if (ln->ln_hold)
1299 m_freem(ln->ln_hold);
1300 Free((caddr_t)ln);
1301 }
1302 }
1303
1304 int
1305 nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp)
1306 {
1307 struct in6_drlist *drl = (struct in6_drlist *)data;
1308 struct in6_prlist *prl = (struct in6_prlist *)data;
1309 struct in6_ndireq *ndi = (struct in6_ndireq *)data;
1310 struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data;
1311 struct in6_ndifreq *ndif = (struct in6_ndifreq *)data;
1312 struct nd_defrouter *dr, any;
1313 struct nd_prefix *pr;
1314 struct rtentry *rt;
1315 int i = 0, error = 0;
1316
1317 switch (cmd) {
1318 case SIOCGDRLST_IN6:
1319 /*
1320 * obsolete API, use sysctl under net.inet6.icmp6
1321 */
1322 bzero(drl, sizeof(*drl));
1323 crit_enter();
1324 dr = TAILQ_FIRST(&nd_defrouter);
1325 while (dr && i < DRLSTSIZ) {
1326 drl->defrouter[i].rtaddr = dr->rtaddr;
1327 if (IN6_IS_ADDR_LINKLOCAL(&drl->defrouter[i].rtaddr)) {
1328 /* XXX: need to this hack for KAME stack */
1329 drl->defrouter[i].rtaddr.s6_addr16[1] = 0;
1330 } else
1331 log(LOG_ERR,
1332 "default router list contains a "
1333 "non-linklocal address(%s)\n",
1334 ip6_sprintf(&drl->defrouter[i].rtaddr));
1335
1336 drl->defrouter[i].flags = dr->flags;
1337 drl->defrouter[i].rtlifetime = dr->rtlifetime;
1338 drl->defrouter[i].expire = dr->expire;
1339 drl->defrouter[i].if_index = dr->ifp->if_index;
1340 i++;
1341 dr = TAILQ_NEXT(dr, dr_entry);
1342 }
1343 crit_exit();
1344 break;
1345 case SIOCGPRLST_IN6:
1346 /*
1347 * obsolete API, use sysctl under net.inet6.icmp6
1348 */
1349 /*
1350 * XXX meaning of fields, especialy "raflags", is very
1351 * differnet between RA prefix list and RR/static prefix list.
1352 * how about separating ioctls into two?
1353 */
1354 bzero(prl, sizeof(*prl));
1355 crit_enter();
1356 pr = nd_prefix.lh_first;
1357 while (pr && i < PRLSTSIZ) {
1358 struct nd_pfxrouter *pfr;
1359 int j;
1360
1361 in6_embedscope(&prl->prefix[i].prefix,
1362 &pr->ndpr_prefix, NULL, NULL);
1363 prl->prefix[i].raflags = pr->ndpr_raf;
1364 prl->prefix[i].prefixlen = pr->ndpr_plen;
1365 prl->prefix[i].vltime = pr->ndpr_vltime;
1366 prl->prefix[i].pltime = pr->ndpr_pltime;
1367 prl->prefix[i].if_index = pr->ndpr_ifp->if_index;
1368 prl->prefix[i].expire = pr->ndpr_expire;
1369
1370 pfr = pr->ndpr_advrtrs.lh_first;
1371 j = 0;
1372 while (pfr) {
1373 if (j < DRLSTSIZ) {
1374 #define RTRADDR prl->prefix[i].advrtr[j]
1375 RTRADDR = pfr->router->rtaddr;
1376 if (IN6_IS_ADDR_LINKLOCAL(&RTRADDR)) {
1377 /* XXX: hack for KAME */
1378 RTRADDR.s6_addr16[1] = 0;
1379 } else
1380 log(LOG_ERR,
1381 "a router(%s) advertises "
1382 "a prefix with "
1383 "non-link local address\n",
1384 ip6_sprintf(&RTRADDR));
1385 #undef RTRADDR
1386 }
1387 j++;
1388 pfr = pfr->pfr_next;
1389 }
1390 prl->prefix[i].advrtrs = j;
1391 prl->prefix[i].origin = PR_ORIG_RA;
1392
1393 i++;
1394 pr = pr->ndpr_next;
1395 }
1396 {
1397 struct rr_prefix *rpp;
1398
1399 for (rpp = LIST_FIRST(&rr_prefix); rpp;
1400 rpp = LIST_NEXT(rpp, rp_entry)) {
1401 if (i >= PRLSTSIZ)
1402 break;
1403 in6_embedscope(&prl->prefix[i].prefix,
1404 &pr->ndpr_prefix, NULL, NULL);
1405 prl->prefix[i].raflags = rpp->rp_raf;
1406 prl->prefix[i].prefixlen = rpp->rp_plen;
1407 prl->prefix[i].vltime = rpp->rp_vltime;
1408 prl->prefix[i].pltime = rpp->rp_pltime;
1409 prl->prefix[i].if_index = rpp->rp_ifp->if_index;
1410 prl->prefix[i].expire = rpp->rp_expire;
1411 prl->prefix[i].advrtrs = 0;
1412 prl->prefix[i].origin = rpp->rp_origin;
1413 i++;
1414 }
1415 }
1416 crit_exit();
1417
1418 break;
1419 case OSIOCGIFINFO_IN6:
1420 /* XXX: old ndp(8) assumes a positive value for linkmtu. */
1421 bzero(&ndi->ndi, sizeof(ndi->ndi));
1422 ndi->ndi.linkmtu = ND_IFINFO(ifp)->linkmtu;
1423 ndi->ndi.maxmtu = ND_IFINFO(ifp)->maxmtu;
1424 ndi->ndi.basereachable = ND_IFINFO(ifp)->basereachable;
1425 ndi->ndi.reachable = ND_IFINFO(ifp)->reachable;
1426 ndi->ndi.retrans = ND_IFINFO(ifp)->retrans;
1427 ndi->ndi.flags = ND_IFINFO(ifp)->flags;
1428 ndi->ndi.recalctm = ND_IFINFO(ifp)->recalctm;
1429 ndi->ndi.chlim = ND_IFINFO(ifp)->chlim;
1430 ndi->ndi.receivedra = ND_IFINFO(ifp)->receivedra;
1431 break;
1432 case SIOCGIFINFO_IN6:
1433 ndi->ndi = *ND_IFINFO(ifp);
1434 break;
1435 case SIOCSIFINFO_FLAGS:
1436 ND_IFINFO(ifp)->flags = ndi->ndi.flags;
1437 break;
1438 case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */
1439 /* flush default router list */
1440 /*
1441 * xxx sumikawa: should not delete route if default
1442 * route equals to the top of default router list
1443 */
1444 bzero(&any, sizeof(any));
1445 defrouter_delreq(&any, 0);
1446 defrouter_select();
1447 /* xxx sumikawa: flush prefix list */
1448 break;
1449 case SIOCSPFXFLUSH_IN6:
1450 {
1451 /* flush all the prefix advertised by routers */
1452 struct nd_prefix *pr, *next;
1453
1454 crit_enter();
1455 for (pr = nd_prefix.lh_first; pr; pr = next) {
1456 struct in6_ifaddr *ia, *ia_next;
1457
1458 next = pr->ndpr_next;
1459
1460 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1461 continue; /* XXX */
1462
1463 /* do we really have to remove addresses as well? */
1464 for (ia = in6_ifaddr; ia; ia = ia_next) {
1465 /* ia might be removed. keep the next ptr. */
1466 ia_next = ia->ia_next;
1467
1468 if (!(ia->ia6_flags & IN6_IFF_AUTOCONF))
1469 continue;
1470
1471 if (ia->ia6_ndpr == pr)
1472 in6_purgeaddr(&ia->ia_ifa);
1473 }
1474 prelist_remove(pr);
1475 }
1476 crit_exit();
1477 break;
1478 }
1479 case SIOCSRTRFLUSH_IN6:
1480 {
1481 /* flush all the default routers */
1482 struct nd_defrouter *dr, *next;
1483
1484 crit_enter();
1485 if ((dr = TAILQ_FIRST(&nd_defrouter)) != NULL) {
1486 /*
1487 * The first entry of the list may be stored in
1488 * the routing table, so we'll delete it later.
1489 */
1490 for (dr = TAILQ_NEXT(dr, dr_entry); dr; dr = next) {
1491 next = TAILQ_NEXT(dr, dr_entry);
1492 defrtrlist_del(dr);
1493 }
1494 defrtrlist_del(TAILQ_FIRST(&nd_defrouter));
1495 }
1496 crit_exit();
1497 break;
1498 }
1499 case SIOCGNBRINFO_IN6:
1500 {
1501 struct llinfo_nd6 *ln;
1502 struct in6_addr nb_addr = nbi->addr; /* make local for safety */
1503
1504 /*
1505 * XXX: KAME specific hack for scoped addresses
1506 * XXXX: for other scopes than link-local?
1507 */
1508 if (IN6_IS_ADDR_LINKLOCAL(&nbi->addr) ||
1509 IN6_IS_ADDR_MC_LINKLOCAL(&nbi->addr)) {
1510 u_int16_t *idp = (u_int16_t *)&nb_addr.s6_addr[2];
1511
1512 if (*idp == 0)
1513 *idp = htons(ifp->if_index);
1514 }
1515
1516 crit_enter();
1517 if ((rt = nd6_lookup(&nb_addr, 0, ifp)) == NULL) {
1518 error = EINVAL;
1519 crit_exit();
1520 break;
1521 }
1522 ln = (struct llinfo_nd6 *)rt->rt_llinfo;
1523 nbi->state = ln->ln_state;
1524 nbi->asked = ln->ln_asked;
1525 nbi->isrouter = ln->ln_router;
1526 nbi->expire = ln->ln_expire;
1527 crit_exit();
1528
1529 break;
1530 }
1531 case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
1532 ndif->ifindex = nd6_defifindex;
1533 break;
1534 case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
1535 return (nd6_setdefaultiface(ndif->ifindex));
1536 break;
1537 }
1538 return (error);
1539 }
1540
1541 /*
1542 * Create neighbor cache entry and cache link-layer address,
1543 * on reception of inbound ND6 packets. (RS/RA/NS/redirect)
1544 */
1545 struct rtentry *
1546 nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr,
1547 int lladdrlen,
1548 int type, /* ICMP6 type */
1549 int code /* type dependent information */)
1550 {
1551 struct rtentry *rt = NULL;
1552 struct llinfo_nd6 *ln = NULL;
1553 int is_newentry;
1554 struct sockaddr_dl *sdl = NULL;
1555 int do_update;
1556 int olladdr;
1557 int llchange;
1558 int newstate = 0;
1559
1560 if (!ifp)
1561 panic("ifp == NULL in nd6_cache_lladdr");
1562 if (!from)
1563 panic("from == NULL in nd6_cache_lladdr");
1564
1565 /* nothing must be updated for unspecified address */
1566 if (IN6_IS_ADDR_UNSPECIFIED(from))
1567 return NULL;
1568
1569 /*
1570 * Validation about ifp->if_addrlen and lladdrlen must be done in
1571 * the caller.
1572 *
1573 * XXX If the link does not have link-layer adderss, what should
1574 * we do? (ifp->if_addrlen == 0)
1575 * Spec says nothing in sections for RA, RS and NA. There's small
1576 * description on it in NS section (RFC 2461 7.2.3).
1577 */
1578
1579 rt = nd6_lookup(from, 0, ifp);
1580 if (!rt) {
1581 #if 0
1582 /* nothing must be done if there's no lladdr */
1583 if (!lladdr || !lladdrlen)
1584 return NULL;
1585 #endif
1586
1587 rt = nd6_lookup(from, 1, ifp);
1588 is_newentry = 1;
1589 } else {
1590 /* do nothing if static ndp is set */
1591 if (rt->rt_flags & RTF_STATIC)
1592 return NULL;
1593 is_newentry = 0;
1594 }
1595
1596 if (!rt)
1597 return NULL;
1598 if ((rt->rt_flags & (RTF_GATEWAY | RTF_LLINFO)) != RTF_LLINFO) {
1599 fail:
1600 nd6_free(rt);
1601 return NULL;
1602 }
1603 ln = (struct llinfo_nd6 *)rt->rt_llinfo;
1604 if (!ln)
1605 goto fail;
1606 if (!rt->rt_gateway)
1607 goto fail;
1608 if (rt->rt_gateway->sa_family != AF_LINK)
1609 goto fail;
1610 sdl = SDL(rt->rt_gateway);
1611
1612 olladdr = (sdl->sdl_alen) ? 1 : 0;
1613 if (olladdr && lladdr) {
1614 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen))
1615 llchange = 1;
1616 else
1617 llchange = 0;
1618 } else
1619 llchange = 0;
1620
1621 /*
1622 * newentry olladdr lladdr llchange (*=record)
1623 * 0 n n -- (1)
1624 * 0 y n -- (2)
1625 * 0 n y -- (3) * STALE
1626 * 0 y y n (4) *
1627 * 0 y y y (5) * STALE
1628 * 1 -- n -- (6) NOSTATE(= PASSIVE)
1629 * 1 -- y -- (7) * STALE
1630 */
1631
1632 if (lladdr) { /* (3-5) and (7) */
1633 /*
1634 * Record source link-layer address
1635 * XXX is it dependent to ifp->if_type?
1636 */
1637 sdl->sdl_alen = ifp->if_addrlen;
1638 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
1639 }
1640
1641 if (!is_newentry) {
1642 if ((!olladdr && lladdr) /* (3) */
1643 || (olladdr && lladdr && llchange)) { /* (5) */
1644 do_update = 1;
1645 newstate = ND6_LLINFO_STALE;
1646 } else /* (1-2,4) */
1647 do_update = 0;
1648 } else {
1649 do_update = 1;
1650 if (!lladdr) /* (6) */
1651 newstate = ND6_LLINFO_NOSTATE;
1652 else /* (7) */
1653 newstate = ND6_LLINFO_STALE;
1654 }
1655
1656 if (do_update) {
1657 /*
1658 * Update the state of the neighbor cache.
1659 */
1660 ln->ln_state = newstate;
1661
1662 if (ln->ln_state == ND6_LLINFO_STALE) {
1663 /*
1664 * XXX: since nd6_output() below will cause
1665 * state tansition to DELAY and reset the timer,
1666 * we must set the timer now, although it is actually
1667 * meaningless.
1668 */
1669 ln->ln_expire = time_second + nd6_gctimer;
1670
1671 if (ln->ln_hold) {
1672 /*
1673 * we assume ifp is not a p2p here, so just
1674 * set the 2nd argument as the 1st one.
1675 */
1676 nd6_output(ifp, ifp, ln->ln_hold,
1677 (struct sockaddr_in6 *)rt_key(rt),
1678 rt);
1679 ln->ln_hold = NULL;
1680 }
1681 } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
1682 /* probe right away */
1683 ln->ln_expire = time_second;
1684 }
1685 }
1686
1687 /*
1688 * ICMP6 type dependent behavior.
1689 *
1690 * NS: clear IsRouter if new entry
1691 * RS: clear IsRouter
1692 * RA: set IsRouter if there's lladdr
1693 * redir: clear IsRouter if new entry
1694 *
1695 * RA case, (1):
1696 * The spec says that we must set IsRouter in the following cases:
1697 * - If lladdr exist, set IsRouter. This means (1-5).
1698 * - If it is old entry (!newentry), set IsRouter. This means (7).
1699 * So, based on the spec, in (1-5) and (7) cases we must set IsRouter.
1700 * A quetion arises for (1) case. (1) case has no lladdr in the
1701 * neighbor cache, this is similar to (6).
1702 * This case is rare but we figured that we MUST NOT set IsRouter.
1703 *
1704 * newentry olladdr lladdr llchange NS RS RA redir
1705 * D R
1706 * 0 n n -- (1) c ? s
1707 * 0 y n -- (2) c s s
1708 * 0 n y -- (3) c s s
1709 * 0 y y n (4) c s s
1710 * 0 y y y (5) c s s
1711 * 1 -- n -- (6) c c c s
1712 * 1 -- y -- (7) c c s c s
1713 *
1714 * (c=clear s=set)
1715 */
1716 switch (type & 0xff) {
1717 case ND_NEIGHBOR_SOLICIT:
1718 /*
1719 * New entry must have is_router flag cleared.
1720 */
1721 if (is_newentry) /* (6-7) */
1722 ln->ln_router = 0;
1723 break;
1724 case ND_REDIRECT:
1725 /*
1726 * If the icmp is a redirect to a better router, always set the
1727 * is_router flag. Otherwise, if the entry is newly created,
1728 * clear the flag. [RFC 2461, sec 8.3]
1729 */
1730 if (code == ND_REDIRECT_ROUTER)
1731 ln->ln_router = 1;
1732 else if (is_newentry) /* (6-7) */
1733 ln->ln_router = 0;
1734 break;
1735 case ND_ROUTER_SOLICIT:
1736 /*
1737 * is_router flag must always be cleared.
1738 */
1739 ln->ln_router = 0;
1740 break;
1741 case ND_ROUTER_ADVERT:
1742 /*
1743 * Mark an entry with lladdr as a router.
1744 */
1745 if ((!is_newentry && (olladdr || lladdr)) /* (2-5) */
1746 || (is_newentry && lladdr)) { /* (7) */
1747 ln->ln_router = 1;
1748 }
1749 break;
1750 }
1751
1752 /*
1753 * When the link-layer address of a router changes, select the
1754 * best router again. In particular, when the neighbor entry is newly
1755 * created, it might affect the selection policy.
1756 * Question: can we restrict the first condition to the "is_newentry"
1757 * case?
1758 * XXX: when we hear an RA from a new router with the link-layer
1759 * address option, defrouter_select() is called twice, since
1760 * defrtrlist_update called the function as well. However, I believe
1761 * we can compromise the overhead, since it only happens the first
1762 * time.
1763 * XXX: although defrouter_select() should not have a bad effect
1764 * for those are not autoconfigured hosts, we explicitly avoid such
1765 * cases for safety.
1766 */
1767 if (do_update && ln->ln_router && !ip6_forwarding && ip6_accept_rtadv)
1768 defrouter_select();
1769
1770 return rt;
1771 }
1772
1773 static void
1774 nd6_slowtimo(void *ignored_arg)
1775 {
1776 struct nd_ifinfo *nd6if;
1777 struct ifnet *ifp;
1778
1779 crit_enter();
1780 callout_reset(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
1781 nd6_slowtimo, NULL);
1782 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
1783 nd6if = ND_IFINFO(ifp);
1784 if (nd6if->basereachable && /* already initialized */
1785 (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) {
1786 /*
1787 * Since reachable time rarely changes by router
1788 * advertisements, we SHOULD insure that a new random
1789 * value gets recomputed at least once every few hours.
1790 * (RFC 2461, 6.3.4)
1791 */
1792 nd6if->recalctm = nd6_recalc_reachtm_interval;
1793 nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable);
1794 }
1795 }
1796 crit_exit();
1797 }
1798
1799 #define gotoerr(e) { error = (e); goto bad;}
1800
1801 int
1802 nd6_output(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m,
1803 struct sockaddr_in6 *dst, struct rtentry *rt)
1804 {
1805 struct llinfo_nd6 *ln = NULL;
1806 int error = 0;
1807
1808 if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr))
1809 goto sendpkt;
1810
1811 if (nd6_need_cache(ifp) == 0)
1812 goto sendpkt;
1813
1814 /*
1815 * next hop determination. This routine is derived from ether_outpout.
1816 */
1817 if (rt != NULL) {
1818 if (!(rt->rt_flags & RTF_UP)) {
1819 rt = rtlookup((struct sockaddr *)dst);
1820 if (rt == NULL)
1821 gotoerr(EHOSTUNREACH);
1822 rt->rt_refcnt--;
1823 if (rt->rt_ifp != ifp) {
1824 /* XXX: loop care? */
1825 return nd6_output(ifp, origifp, m, dst, rt);
1826 }
1827 }
1828 if (rt->rt_flags & RTF_GATEWAY) {
1829 struct sockaddr_in6 *gw6;
1830
1831 /*
1832 * We skip link-layer address resolution and NUD
1833 * if the gateway is not a neighbor from ND point
1834 * of view, regardless of the value of nd_ifinfo.flags.
1835 * The second condition is a bit tricky; we skip
1836 * if the gateway is our own address, which is
1837 * sometimes used to install a route to a p2p link.
1838 */
1839 gw6 = (struct sockaddr_in6 *)rt->rt_gateway;
1840 if (!nd6_is_addr_neighbor(gw6, ifp) ||
1841 in6ifa_ifpwithaddr(ifp, &gw6->sin6_addr)) {
1842 /*
1843 * We allow this kind of tricky route only
1844 * when the outgoing interface is p2p.
1845 * XXX: we may need a more generic rule here.
1846 */
1847 if (!(ifp->if_flags & IFF_POINTOPOINT))
1848 gotoerr(EHOSTUNREACH);
1849
1850 goto sendpkt;
1851 }
1852
1853 if (rt->rt_gwroute == NULL) {
1854 rt->rt_gwroute = rtlookup(rt->rt_gateway);
1855 if (rt->rt_gwroute == NULL)
1856 gotoerr(EHOSTUNREACH);
1857 } else if (!(rt->rt_gwroute->rt_flags & RTF_UP)) {
1858 rtfree(rt->rt_gwroute);
1859 rt->rt_gwroute = rtlookup(rt->rt_gateway);
1860 if (rt->rt_gwroute == NULL)
1861 gotoerr(EHOSTUNREACH);
1862 }
1863 }
1864 }
1865
1866 /*
1867 * Address resolution or Neighbor Unreachability Detection
1868 * for the next hop.
1869 * At this point, the destination of the packet must be a unicast
1870 * or an anycast address(i.e. not a multicast).
1871 */
1872
1873 /* Look up the neighbor cache for the nexthop */
1874 if (rt && (rt->rt_flags & RTF_LLINFO))
1875 ln = (struct llinfo_nd6 *)rt->rt_llinfo;
1876 else {
1877 /*
1878 * Since nd6_is_addr_neighbor() internally calls nd6_lookup(),
1879 * the condition below is not very efficient. But we believe
1880 * it is tolerable, because this should be a rare case.
1881 */
1882 if (nd6_is_addr_neighbor(dst, ifp) &&
1883 (rt = nd6_lookup(&dst->sin6_addr, 1, ifp)) != NULL)
1884 ln = (struct llinfo_nd6 *)rt->rt_llinfo;
1885 }
1886 if (!ln || !rt) {
1887 if (!(ifp->if_flags & IFF_POINTOPOINT) &&
1888 !(ND_IFINFO(ifp)->flags & ND6_IFF_PERFORMNUD)) {
1889 log(LOG_DEBUG,
1890 "nd6_output: can't allocate llinfo for %s "
1891 "(ln=%p, rt=%p)\n",
1892 ip6_sprintf(&dst->sin6_addr), ln, rt);
1893 gotoerr(EIO); /* XXX: good error? */
1894 }
1895
1896 goto sendpkt; /* send anyway */
1897 }
1898
1899 /* We don't have to do link-layer address resolution on a p2p link. */
1900 if ((ifp->if_flags & IFF_POINTOPOINT) &&
1901 ln->ln_state < ND6_LLINFO_REACHABLE) {
1902 ln->ln_state = ND6_LLINFO_STALE;
1903 ln->ln_expire = time_second + nd6_gctimer;
1904 }
1905
1906 /*
1907 * The first time we send a packet to a neighbor whose entry is
1908 * STALE, we have to change the state to DELAY and a sets a timer to
1909 * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do
1910 * neighbor unreachability detection on expiration.
1911 * (RFC 2461 7.3.3)
1912 */
1913 if (ln->ln_state == ND6_LLINFO_STALE) {
1914 ln->ln_asked = 0;
1915 ln->ln_state = ND6_LLINFO_DELAY;
1916 ln->ln_expire = time_second + nd6_delay;
1917 }
1918
1919 /*
1920 * If the neighbor cache entry has a state other than INCOMPLETE
1921 * (i.e. its link-layer address is already resolved), just
1922 * send the packet.
1923 */
1924 if (ln->ln_state > ND6_LLINFO_INCOMPLETE)
1925 goto sendpkt;
1926
1927 /*
1928 * There is a neighbor cache entry, but no ethernet address
1929 * response yet. Replace the held mbuf (if any) with this
1930 * latest one.
1931 *
1932 * This code conforms to the rate-limiting rule described in Section
1933 * 7.2.2 of RFC 2461, because the timer is set correctly after sending
1934 * an NS below.
1935 */
1936 if (ln->ln_state == ND6_LLINFO_NOSTATE)
1937 ln->ln_state = ND6_LLINFO_INCOMPLETE;
1938 if (ln->ln_hold)
1939 m_freem(ln->ln_hold);
1940 ln->ln_hold = m;
1941 if (ln->ln_expire) {
1942 if (ln->ln_asked < nd6_mmaxtries &&
1943 ln->ln_expire < time_second) {
1944 ln->ln_asked++;
1945 ln->ln_expire = time_second +
1946 ND_IFINFO(ifp)->retrans / 1000;
1947 nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0);
1948 }
1949 }
1950 return (0);
1951
1952 sendpkt:
1953 lwkt_serialize_enter(ifp->if_serializer);
1954 if (ifp->if_flags & IFF_LOOPBACK) {
1955 error = (*ifp->if_output)(origifp, m, (struct sockaddr *)dst,
1956 rt);
1957 } else {
1958 error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, rt);
1959 }
1960 lwkt_serialize_exit(ifp->if_serializer);
1961 return (error);
1962
1963 bad:
1964 m_freem(m);
1965 return (error);
1966 }
1967 #undef gotoerr
1968
1969 int
1970 nd6_need_cache(struct ifnet *ifp)
1971 {
1972 /*
1973 * XXX: we currently do not make neighbor cache on any interface
1974 * other than Ethernet and GIF.
1975 *
1976 * RFC2893 says:
1977 * - unidirectional tunnels needs no ND
1978 */
1979 switch (ifp->if_type) {
1980 case IFT_ETHER:
1981 case IFT_IEEE1394:
1982 #ifdef IFT_L2VLAN
1983 case IFT_L2VLAN:
1984 #endif
1985 #ifdef IFT_IEEE80211
1986 case IFT_IEEE80211:
1987 #endif
1988 #ifdef IFT_CARP
1989 case IFT_CARP:
1990 #endif
1991 case IFT_GIF: /* XXX need more cases? */
1992 return (1);
1993 default:
1994 return (0);
1995 }
1996 }
1997
1998 int
1999 nd6_storelladdr(struct ifnet *ifp, struct rtentry *rt0, struct mbuf *m,
2000 struct sockaddr *dst, u_char *desten)
2001 {
2002 struct sockaddr_dl *sdl;
2003 struct rtentry *rt;
2004
2005
2006 if (m->m_flags & M_MCAST) {
2007 switch (ifp->if_type) {
2008 case IFT_ETHER:
2009 #ifdef IFT_L2VLAN
2010 case IFT_L2VLAN:
2011 #endif
2012 #ifdef IFT_IEEE80211
2013 case IFT_IEEE80211:
2014 #endif
2015 ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr,
2016 desten);
2017 return (1);
2018 case IFT_IEEE1394:
2019 bcopy(ifp->if_broadcastaddr, desten, ifp->if_addrlen);
2020 return (1);
2021 default:
2022 m_freem(m);
2023 return (0);
2024 }
2025 }
2026 if (rt0 == NULL) {
2027 /* this could happen, if we could not allocate memory */
2028 m_freem(m);
2029 return (0);
2030 }
2031 if (rt_llroute(dst, rt0, &rt) != 0) {
2032 m_freem(m);
2033 return (0);
2034 }
2035 if (rt->rt_gateway->sa_family != AF_LINK) {
2036 kprintf("nd6_storelladdr: something odd happens\n");
2037 m_freem(m);
2038 return (0);
2039 }
2040 sdl = SDL(rt->rt_gateway);
2041 if (sdl->sdl_alen == 0) {
2042 /* this should be impossible, but we bark here for debugging */
2043 kprintf("nd6_storelladdr: sdl_alen == 0\n");
2044 m_freem(m);
2045 return (0);
2046 }
2047
2048 bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
2049 return (1);
2050 }
2051
2052 static int nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS);
2053 static int nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS);
2054 #ifdef SYSCTL_DECL
2055 SYSCTL_DECL(_net_inet6_icmp6);
2056 #endif
2057 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
2058 CTLFLAG_RD, nd6_sysctl_drlist, "");
2059 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist,
2060 CTLFLAG_RD, nd6_sysctl_prlist, "");
2061
2062 static int
2063 nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS)
2064 {
2065 int error;
2066 char buf[1024];
2067 struct in6_defrouter *d, *de;
2068 struct nd_defrouter *dr;
2069
2070 if (req->newptr)
2071 return EPERM;
2072 error = 0;
2073
2074 for (dr = TAILQ_FIRST(&nd_defrouter);
2075 dr;
2076 dr = TAILQ_NEXT(dr, dr_entry)) {
2077 d = (struct in6_defrouter *)buf;
2078 de = (struct in6_defrouter *)(buf + sizeof(buf));
2079
2080 if (d + 1 <= de) {
2081 bzero(d, sizeof(*d));
2082 d->rtaddr.sin6_family = AF_INET6;
2083 d->rtaddr.sin6_len = sizeof(d->rtaddr);
2084 if (in6_recoverscope(&d->rtaddr, &dr->rtaddr,
2085 dr->ifp) != 0)
2086 log(LOG_ERR,
2087 "scope error in "
2088 "default router list (%s)\n",
2089 ip6_sprintf(&dr->rtaddr));
2090 d->flags = dr->flags;
2091 d->rtlifetime = dr->rtlifetime;
2092 d->expire = dr->expire;
2093 d->if_index = dr->ifp->if_index;
2094 } else
2095 panic("buffer too short");
2096
2097 error = SYSCTL_OUT(req, buf, sizeof(*d));
2098 if (error)
2099 break;
2100 }
2101 return error;
2102 }
2103
2104 static int
2105 nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS)
2106 {
2107 int error;
2108 char buf[1024];
2109 struct in6_prefix *p, *pe;
2110 struct nd_prefix *pr;
2111
2112 if (req->newptr)
2113 return EPERM;
2114 error = 0;
2115
2116 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
2117 u_short advrtrs;
2118 size_t advance;
2119 struct sockaddr_in6 *sin6, *s6;
2120 struct nd_pfxrouter *pfr;
2121
2122 p = (struct in6_prefix *)buf;
2123 pe = (struct in6_prefix *)(buf + sizeof(buf));
2124
2125 if (p + 1 <= pe) {
2126 bzero(p, sizeof(*p));
2127 sin6 = (struct sockaddr_in6 *)(p + 1);
2128
2129 p->prefix = pr->ndpr_prefix;
2130 if (in6_recoverscope(&p->prefix,
2131 &p->prefix.sin6_addr, pr->ndpr_ifp) != 0)
2132 log(LOG_ERR,
2133 "scope error in prefix list (%s)\n",
2134 ip6_sprintf(&p->prefix.sin6_addr));
2135 p->raflags = pr->ndpr_raf;
2136 p->prefixlen = pr->ndpr_plen;
2137 p->vltime = pr->ndpr_vltime;
2138 p->pltime = pr->ndpr_pltime;
2139 p->if_index = pr->ndpr_ifp->if_index;
2140 p->expire = pr->ndpr_expire;
2141 p->refcnt = pr->ndpr_refcnt;
2142 p->flags = pr->ndpr_stateflags;
2143 p->origin = PR_ORIG_RA;
2144 advrtrs = 0;
2145 for (pfr = pr->ndpr_advrtrs.lh_first;
2146 pfr;
2147 pfr = pfr->pfr_next) {
2148 if ((void *)&sin6[advrtrs + 1] >
2149 (void *)pe) {
2150 advrtrs++;
2151 continue;
2152 }
2153 s6 = &sin6[advrtrs];
2154 bzero(s6, sizeof(*s6));
2155 s6->sin6_family = AF_INET6;
2156 s6->sin6_len = sizeof(*sin6);
2157 if (in6_recoverscope(s6, &pfr->router->rtaddr,
2158 pfr->router->ifp) != 0)
2159 log(LOG_ERR,
2160 "scope error in "
2161 "prefix list (%s)\n",
2162 ip6_sprintf(&pfr->router->rtaddr));
2163 advrtrs++;
2164 }
2165 p->advrtrs = advrtrs;
2166 } else
2167 panic("buffer too short");
2168
2169 advance = sizeof(*p) + sizeof(*sin6) * advrtrs;
2170 error = SYSCTL_OUT(req, buf, advance);
2171 if (error)
2172 break;
2173 }
2174 return error;
2175 }
DragonFly BSD