1/* $NetBSD: icmp6.c,v 1.201 2016/11/15 20:50:28 mlelstv Exp $ */
2/* $KAME: icmp6.c,v 1.217 2001/06/20 15:03:29 jinmei Exp $ */
3
4/*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33/*
34 * Copyright (c) 1982, 1986, 1988, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 * 3. Neither the name of the University nor the names of its contributors
46 * may be used to endorse or promote products derived from this software
47 * without specific prior written permission.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59 * SUCH DAMAGE.
60 *
61 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
62 */
63
64#include <sys/cdefs.h>
65__KERNEL_RCSID(0, "$NetBSD: icmp6.c,v 1.201 2016/11/15 20:50:28 mlelstv Exp $");
66
67#ifdef _KERNEL_OPT
68#include "opt_inet.h"
69#include "opt_ipsec.h"
70#endif
71
72#include <sys/param.h>
73#include <sys/systm.h>
74#include <sys/kmem.h>
75#include <sys/mbuf.h>
76#include <sys/protosw.h>
77#include <sys/socket.h>
78#include <sys/socketvar.h>
79#include <sys/time.h>
80#include <sys/kernel.h>
81#include <sys/syslog.h>
82#include <sys/domain.h>
83#include <sys/sysctl.h>
84
85#include <net/if.h>
86#include <net/route.h>
87#include <net/if_dl.h>
88#include <net/if_types.h>
89
90#include <netinet/in.h>
91#include <netinet/in_var.h>
92#include <netinet/ip6.h>
93#include <netinet6/ip6_var.h>
94#include <netinet6/ip6_private.h>
95#include <netinet/icmp6.h>
96#include <netinet6/icmp6_private.h>
97#include <netinet6/mld6_var.h>
98#include <netinet6/in6_pcb.h>
99#include <netinet6/nd6.h>
100#include <netinet6/in6_ifattach.h>
101#include <netinet6/ip6protosw.h>
102#include <netinet6/scope6_var.h>
103
104#ifdef IPSEC
105#include <netipsec/ipsec.h>
106#include <netipsec/key.h>
107#endif
108
109
110#include "faith.h"
111#if defined(NFAITH) && 0 < NFAITH
112#include <net/if_faith.h>
113#endif
114
115#include <net/net_osdep.h>
116
117extern struct domain inet6domain;
118
119percpu_t *icmp6stat_percpu;
120
121extern struct inpcbtable raw6cbtable;
122extern int icmp6errppslim;
123static int icmp6errpps_count = 0;
124static struct timeval icmp6errppslim_last;
125extern int icmp6_nodeinfo;
126
127/*
128 * List of callbacks to notify when Path MTU changes are made.
129 */
130struct icmp6_mtudisc_callback {
131 LIST_ENTRY(icmp6_mtudisc_callback) mc_list;
132 void (*mc_func)(struct in6_addr *);
133};
134
135LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks =
136 LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks);
137
138static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL;
139extern int pmtu_expire;
140
141/* XXX do these values make any sense? */
142static int icmp6_mtudisc_hiwat = 1280;
143static int icmp6_mtudisc_lowat = 256;
144
145/*
146 * keep track of # of redirect routes.
147 */
148static struct rttimer_queue *icmp6_redirect_timeout_q = NULL;
149
150/* XXX experimental, turned off */
151static int icmp6_redirect_hiwat = -1;
152static int icmp6_redirect_lowat = -1;
153
154static void icmp6_errcount(u_int, int, int);
155static int icmp6_rip6_input(struct mbuf **, int);
156static int icmp6_ratelimit(const struct in6_addr *, const int, const int);
157static const char *icmp6_redirect_diag(struct in6_addr *,
158 struct in6_addr *, struct in6_addr *);
159static struct mbuf *ni6_input(struct mbuf *, int);
160static struct mbuf *ni6_nametodns(const char *, int, int);
161static int ni6_dnsmatch(const char *, int, const char *, int);
162static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *,
163 struct ifnet **, char *, struct psref *);
164static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
165 struct ifnet *, int);
166static int icmp6_notify_error(struct mbuf *, int, int, int);
167static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *);
168static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *);
169static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *);
170static void sysctl_net_inet6_icmp6_setup(struct sysctllog **);
171
172
173void
174icmp6_init(void)
175{
176
177 sysctl_net_inet6_icmp6_setup(NULL);
178 mld_init();
179 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire);
180 icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout);
181
182 icmp6stat_percpu = percpu_alloc(sizeof(uint64_t) * ICMP6_NSTATS);
183}
184
185static void
186icmp6_errcount(u_int base, int type, int code)
187{
188 switch (type) {
189 case ICMP6_DST_UNREACH:
190 switch (code) {
191 case ICMP6_DST_UNREACH_NOROUTE:
192 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOROUTE);
193 return;
194 case ICMP6_DST_UNREACH_ADMIN:
195 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADMIN);
196 return;
197 case ICMP6_DST_UNREACH_BEYONDSCOPE:
198 ICMP6_STATINC(base +
199 ICMP6_ERRSTAT_DST_UNREACH_BEYONDSCOPE);
200 return;
201 case ICMP6_DST_UNREACH_ADDR:
202 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADDR);
203 return;
204 case ICMP6_DST_UNREACH_NOPORT:
205 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOPORT);
206 return;
207 }
208 break;
209 case ICMP6_PACKET_TOO_BIG:
210 ICMP6_STATINC(base + ICMP6_ERRSTAT_PACKET_TOO_BIG);
211 return;
212 case ICMP6_TIME_EXCEEDED:
213 switch (code) {
214 case ICMP6_TIME_EXCEED_TRANSIT:
215 ICMP6_STATINC(base + ICMP6_ERRSTAT_TIME_EXCEED_TRANSIT);
216 return;
217 case ICMP6_TIME_EXCEED_REASSEMBLY:
218 ICMP6_STATINC(base +
219 ICMP6_ERRSTAT_TIME_EXCEED_REASSEMBLY);
220 return;
221 }
222 break;
223 case ICMP6_PARAM_PROB:
224 switch (code) {
225 case ICMP6_PARAMPROB_HEADER:
226 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_HEADER);
227 return;
228 case ICMP6_PARAMPROB_NEXTHEADER:
229 ICMP6_STATINC(base +
230 ICMP6_ERRSTAT_PARAMPROB_NEXTHEADER);
231 return;
232 case ICMP6_PARAMPROB_OPTION:
233 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_OPTION);
234 return;
235 }
236 break;
237 case ND_REDIRECT:
238 ICMP6_STATINC(base + ICMP6_ERRSTAT_REDIRECT);
239 return;
240 }
241 ICMP6_STATINC(base + ICMP6_ERRSTAT_UNKNOWN);
242}
243
244/*
245 * Register a Path MTU Discovery callback.
246 */
247void
248icmp6_mtudisc_callback_register(void (*func)(struct in6_addr *))
249{
250 struct icmp6_mtudisc_callback *mc;
251
252 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL;
253 mc = LIST_NEXT(mc, mc_list)) {
254 if (mc->mc_func == func)
255 return;
256 }
257
258 mc = kmem_alloc(sizeof(*mc), KM_SLEEP);
259 mc->mc_func = func;
260 LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, mc, mc_list);
261}
262
263/*
264 * A wrapper function for icmp6_error() necessary when the erroneous packet
265 * may not contain enough scope zone information.
266 */
267void
268icmp6_error2(struct mbuf *m, int type, int code, int param,
269 struct ifnet *ifp)
270{
271 struct ip6_hdr *ip6;
272
273 if (ifp == NULL)
274 return;
275
276 if (m->m_len < sizeof(struct ip6_hdr)) {
277 m = m_pullup(m, sizeof(struct ip6_hdr));
278 if (m == NULL)
279 return;
280 }
281
282 ip6 = mtod(m, struct ip6_hdr *);
283
284 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
285 return;
286 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
287 return;
288
289 icmp6_error(m, type, code, param);
290}
291
292/*
293 * Generate an error packet of type error in response to bad IP6 packet.
294 */
295void
296icmp6_error(struct mbuf *m, int type, int code, int param)
297{
298 struct ip6_hdr *oip6, *nip6;
299 struct icmp6_hdr *icmp6;
300 u_int preplen;
301 int off;
302 int nxt;
303
304 ICMP6_STATINC(ICMP6_STAT_ERROR);
305
306 /* count per-type-code statistics */
307 icmp6_errcount(ICMP6_STAT_OUTERRHIST, type, code);
308
309 if (m->m_flags & M_DECRYPTED) {
310 ICMP6_STATINC(ICMP6_STAT_CANTERROR);
311 goto freeit;
312 }
313
314 if (M_UNWRITABLE(m, sizeof(struct ip6_hdr)) &&
315 (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL)
316 return;
317 oip6 = mtod(m, struct ip6_hdr *);
318
319 /*
320 * If the destination address of the erroneous packet is a multicast
321 * address, or the packet was sent using link-layer multicast,
322 * we should basically suppress sending an error (RFC 2463, Section
323 * 2.4).
324 * We have two exceptions (the item e.2 in that section):
325 * - the Pakcet Too Big message can be sent for path MTU discovery.
326 * - the Parameter Problem Message that can be allowed an icmp6 error
327 * in the option type field. This check has been done in
328 * ip6_unknown_opt(), so we can just check the type and code.
329 */
330 if ((m->m_flags & (M_BCAST|M_MCAST) ||
331 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
332 (type != ICMP6_PACKET_TOO_BIG &&
333 (type != ICMP6_PARAM_PROB ||
334 code != ICMP6_PARAMPROB_OPTION)))
335 goto freeit;
336
337 /*
338 * RFC 2463, 2.4 (e.5): source address check.
339 * XXX: the case of anycast source?
340 */
341 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
342 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
343 goto freeit;
344
345 /*
346 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
347 * don't do it.
348 */
349 nxt = -1;
350 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
351 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
352 struct icmp6_hdr *icp;
353
354 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
355 sizeof(*icp));
356 if (icp == NULL) {
357 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
358 return;
359 }
360 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
361 icp->icmp6_type == ND_REDIRECT) {
362 /*
363 * ICMPv6 error
364 * Special case: for redirect (which is
365 * informational) we must not send icmp6 error.
366 */
367 ICMP6_STATINC(ICMP6_STAT_CANTERROR);
368 goto freeit;
369 } else {
370 /* ICMPv6 informational - send the error */
371 }
372 }
373#if 0 /* controversial */
374 else if (off >= 0 && nxt == IPPROTO_ESP) {
375 /*
376 * It could be ICMPv6 error inside ESP. Take a safer side,
377 * don't respond.
378 */
379 ICMP6_STATINC(ICMP6_STAT_CANTERROR);
380 goto freeit;
381 }
382#endif
383 else {
384 /* non-ICMPv6 - send the error */
385 }
386
387 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
388
389 /* Finally, do rate limitation check. */
390 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
391 ICMP6_STATINC(ICMP6_STAT_TOOFREQ);
392 goto freeit;
393 }
394
395 /*
396 * OK, ICMP6 can be generated.
397 */
398
399 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
400 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
401
402 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
403 M_PREPEND(m, preplen, M_DONTWAIT);
404 if (m && M_UNWRITABLE(m, preplen))
405 m = m_pullup(m, preplen);
406 if (m == NULL) {
407 nd6log(LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__);
408 return;
409 }
410
411 nip6 = mtod(m, struct ip6_hdr *);
412 nip6->ip6_src = oip6->ip6_src;
413 nip6->ip6_dst = oip6->ip6_dst;
414
415 in6_clearscope(&oip6->ip6_src);
416 in6_clearscope(&oip6->ip6_dst);
417
418 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
419 icmp6->icmp6_type = type;
420 icmp6->icmp6_code = code;
421 icmp6->icmp6_pptr = htonl((u_int32_t)param);
422
423 /*
424 * icmp6_reflect() is designed to be in the input path.
425 * icmp6_error() can be called from both input and output path,
426 * and if we are in output path rcvif could contain bogus value.
427 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
428 * information in ip header (nip6).
429 */
430 m_reset_rcvif(m);
431
432 ICMP6_STATINC(ICMP6_STAT_OUTHIST + type);
433 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
434
435 return;
436
437 freeit:
438 /*
439 * If we can't tell whether or not we can generate ICMP6, free it.
440 */
441 m_freem(m);
442}
443
444/*
445 * Process a received ICMP6 message.
446 */
447int
448icmp6_input(struct mbuf **mp, int *offp, int proto)
449{
450 struct mbuf *m = *mp, *n;
451 struct ip6_hdr *ip6, *nip6;
452 struct icmp6_hdr *icmp6, *nicmp6;
453 int off = *offp;
454 int icmp6len = m->m_pkthdr.len - *offp;
455 int code, sum, noff;
456 struct ifnet *rcvif;
457 struct psref psref;
458
459 rcvif = m_get_rcvif_psref(m, &psref);
460 if (__predict_false(rcvif == NULL))
461 goto freeit;
462
463#define ICMP6_MAXLEN (sizeof(*nip6) + sizeof(*nicmp6) + 4)
464 KASSERT(ICMP6_MAXLEN < MCLBYTES);
465 icmp6_ifstat_inc(rcvif, ifs6_in_msg);
466
467 /*
468 * Locate icmp6 structure in mbuf, and check
469 * that not corrupted and of at least minimum length
470 */
471
472 if (icmp6len < sizeof(struct icmp6_hdr)) {
473 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
474 icmp6_ifstat_inc(rcvif, ifs6_in_error);
475 goto freeit;
476 }
477
478 ip6 = mtod(m, struct ip6_hdr *);
479 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
480 if (icmp6 == NULL) {
481 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
482 icmp6_ifstat_inc(rcvif, ifs6_in_error);
483 goto freeit;
484 }
485 /*
486 * Enforce alignment requirements that are violated in
487 * some cases, see kern/50766 for details.
488 */
489 if (IP6_HDR_ALIGNED_P(icmp6) == 0) {
490 m = m_copyup(m, off + sizeof(struct icmp6_hdr), 0);
491 if (m == NULL) {
492 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
493 icmp6_ifstat_inc(rcvif, ifs6_in_error);
494 goto freeit;
495 }
496 ip6 = mtod(m, struct ip6_hdr *);
497 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
498 }
499 KASSERT(IP6_HDR_ALIGNED_P(icmp6));
500
501 /*
502 * calculate the checksum
503 */
504 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
505 nd6log(LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n",
506 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src));
507 ICMP6_STATINC(ICMP6_STAT_CHECKSUM);
508 icmp6_ifstat_inc(rcvif, ifs6_in_error);
509 goto freeit;
510 }
511
512#if defined(NFAITH) && 0 < NFAITH
513 if (faithprefix(&ip6->ip6_dst)) {
514 /*
515 * Deliver very specific ICMP6 type only.
516 * This is important to deliver TOOBIG. Otherwise PMTUD
517 * will not work.
518 */
519 switch (icmp6->icmp6_type) {
520 case ICMP6_DST_UNREACH:
521 case ICMP6_PACKET_TOO_BIG:
522 case ICMP6_TIME_EXCEEDED:
523 break;
524 default:
525 goto freeit;
526 }
527 }
528#endif
529
530 code = icmp6->icmp6_code;
531 ICMP6_STATINC(ICMP6_STAT_INHIST + icmp6->icmp6_type);
532
533 switch (icmp6->icmp6_type) {
534 case ICMP6_DST_UNREACH:
535 icmp6_ifstat_inc(rcvif, ifs6_in_dstunreach);
536 switch (code) {
537 case ICMP6_DST_UNREACH_NOROUTE:
538 code = PRC_UNREACH_NET;
539 break;
540 case ICMP6_DST_UNREACH_ADMIN:
541 icmp6_ifstat_inc(rcvif, ifs6_in_adminprohib);
542 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
543 break;
544 case ICMP6_DST_UNREACH_ADDR:
545 code = PRC_HOSTDEAD;
546 break;
547#ifdef COMPAT_RFC1885
548 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
549 code = PRC_UNREACH_SRCFAIL;
550 break;
551#else
552 case ICMP6_DST_UNREACH_BEYONDSCOPE:
553 /* I mean "source address was incorrect." */
554 code = PRC_UNREACH_NET;
555 break;
556#endif
557 case ICMP6_DST_UNREACH_NOPORT:
558 code = PRC_UNREACH_PORT;
559 break;
560 default:
561 goto badcode;
562 }
563 goto deliver;
564
565 case ICMP6_PACKET_TOO_BIG:
566 icmp6_ifstat_inc(rcvif, ifs6_in_pkttoobig);
567
568 /*
569 * MTU is checked in icmp6_mtudisc.
570 */
571 code = PRC_MSGSIZE;
572
573 /*
574 * Updating the path MTU will be done after examining
575 * intermediate extension headers.
576 */
577 goto deliver;
578
579 case ICMP6_TIME_EXCEEDED:
580 icmp6_ifstat_inc(rcvif, ifs6_in_timeexceed);
581 switch (code) {
582 case ICMP6_TIME_EXCEED_TRANSIT:
583 code = PRC_TIMXCEED_INTRANS;
584 break;
585 case ICMP6_TIME_EXCEED_REASSEMBLY:
586 code = PRC_TIMXCEED_REASS;
587 break;
588 default:
589 goto badcode;
590 }
591 goto deliver;
592
593 case ICMP6_PARAM_PROB:
594 icmp6_ifstat_inc(rcvif, ifs6_in_paramprob);
595 switch (code) {
596 case ICMP6_PARAMPROB_NEXTHEADER:
597 code = PRC_UNREACH_PROTOCOL;
598 break;
599 case ICMP6_PARAMPROB_HEADER:
600 case ICMP6_PARAMPROB_OPTION:
601 code = PRC_PARAMPROB;
602 break;
603 default:
604 goto badcode;
605 }
606 goto deliver;
607
608 case ICMP6_ECHO_REQUEST:
609 icmp6_ifstat_inc(rcvif, ifs6_in_echo);
610 if (code != 0)
611 goto badcode;
612 /*
613 * Copy mbuf to send to two data paths: userland socket(s),
614 * and to the querier (echo reply).
615 * m: a copy for socket, n: a copy for querier
616 *
617 * If the first mbuf is shared, or the first mbuf is too short,
618 * copy the first part of the data into a fresh mbuf.
619 * Otherwise, we will wrongly overwrite both copies.
620 */
621 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
622 /* Give up local */
623 n = m;
624 m = NULL;
625 } else if (M_READONLY(n) ||
626 n->m_len < off + sizeof(struct icmp6_hdr)) {
627 struct mbuf *n0 = n;
628
629 /*
630 * Prepare an internal mbuf. m_pullup() doesn't
631 * always copy the length we specified.
632 */
633 if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
634 /* Give up local */
635 n = m;
636 m = NULL;
637 }
638 m_freem(n0);
639 }
640 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
641 sizeof(*nicmp6));
642 if (nicmp6 == NULL)
643 goto freeit;
644 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
645 nicmp6->icmp6_code = 0;
646 if (n) {
647 uint64_t *icmp6s = ICMP6_STAT_GETREF();
648 icmp6s[ICMP6_STAT_REFLECT]++;
649 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY]++;
650 ICMP6_STAT_PUTREF();
651 icmp6_reflect(n, off);
652 }
653 if (!m)
654 goto freeit;
655 break;
656
657 case ICMP6_ECHO_REPLY:
658 icmp6_ifstat_inc(rcvif, ifs6_in_echoreply);
659 if (code != 0)
660 goto badcode;
661 break;
662
663 case MLD_LISTENER_QUERY:
664 case MLD_LISTENER_REPORT:
665 if (icmp6len < sizeof(struct mld_hdr))
666 goto badlen;
667 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
668 icmp6_ifstat_inc(rcvif, ifs6_in_mldquery);
669 else
670 icmp6_ifstat_inc(rcvif, ifs6_in_mldreport);
671 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
672 /* give up local */
673 mld_input(m, off);
674 m = NULL;
675 goto freeit;
676 }
677 mld_input(n, off);
678 /* m stays. */
679 break;
680
681 case MLD_LISTENER_DONE:
682 icmp6_ifstat_inc(rcvif, ifs6_in_mlddone);
683 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
684 goto badlen;
685 break; /* nothing to be done in kernel */
686
687 case MLD_MTRACE_RESP:
688 case MLD_MTRACE:
689 /* XXX: these two are experimental. not officially defined. */
690 /* XXX: per-interface statistics? */
691 break; /* just pass it to applications */
692
693 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
694 {
695 enum { WRU, FQDN } mode;
696
697 if (!icmp6_nodeinfo)
698 break;
699
700 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
701 mode = WRU;
702 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
703 mode = FQDN;
704 else
705 goto badlen;
706
707 if (mode == FQDN) {
708 n = m_copym(m, 0, M_COPYALL, M_DONTWAIT);
709 if (n)
710 n = ni6_input(n, off);
711 /* XXX meaningless if n == NULL */
712 noff = sizeof(struct ip6_hdr);
713 } else {
714 u_char *p;
715 int maxhlen;
716
717 if ((icmp6_nodeinfo & 5) != 5)
718 break;
719
720 if (code != 0)
721 goto badcode;
722 MGETHDR(n, M_DONTWAIT, m->m_type);
723 if (n && ICMP6_MAXLEN > MHLEN) {
724 MCLGET(n, M_DONTWAIT);
725 if ((n->m_flags & M_EXT) == 0) {
726 m_free(n);
727 n = NULL;
728 }
729 }
730 if (n == NULL) {
731 /* Give up remote */
732 break;
733 }
734 m_reset_rcvif(n);
735 n->m_len = 0;
736 maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN;
737 if (maxhlen < 0)
738 break;
739 if (maxhlen > hostnamelen)
740 maxhlen = hostnamelen;
741 /*
742 * Copy IPv6 and ICMPv6 only.
743 */
744 nip6 = mtod(n, struct ip6_hdr *);
745 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
746 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
747 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
748 p = (u_char *)(nicmp6 + 1);
749 memset(p, 0, 4);
750 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
751 noff = sizeof(struct ip6_hdr);
752 M_COPY_PKTHDR(n, m); /* just for rcvif */
753 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
754 sizeof(struct icmp6_hdr) + 4 + maxhlen;
755 nicmp6->icmp6_type = ICMP6_WRUREPLY;
756 nicmp6->icmp6_code = 0;
757 }
758#undef hostnamelen
759 if (n) {
760 uint64_t *icmp6s = ICMP6_STAT_GETREF();
761 icmp6s[ICMP6_STAT_REFLECT]++;
762 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY]++;
763 ICMP6_STAT_PUTREF();
764 icmp6_reflect(n, noff);
765 }
766 break;
767 }
768
769 case ICMP6_WRUREPLY:
770 if (code != 0)
771 goto badcode;
772 break;
773
774 case ND_ROUTER_SOLICIT:
775 icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit);
776 if (code != 0)
777 goto badcode;
778 if (icmp6len < sizeof(struct nd_router_solicit))
779 goto badlen;
780 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
781 /* give up local */
782 nd6_rs_input(m, off, icmp6len);
783 m = NULL;
784 goto freeit;
785 }
786 nd6_rs_input(n, off, icmp6len);
787 /* m stays. */
788 break;
789
790 case ND_ROUTER_ADVERT:
791 icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert);
792 if (code != 0)
793 goto badcode;
794 if (icmp6len < sizeof(struct nd_router_advert))
795 goto badlen;
796 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
797 /* give up local */
798 nd6_ra_input(m, off, icmp6len);
799 m = NULL;
800 goto freeit;
801 }
802 nd6_ra_input(n, off, icmp6len);
803 /* m stays. */
804 break;
805
806 case ND_NEIGHBOR_SOLICIT:
807 icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit);
808 if (code != 0)
809 goto badcode;
810 if (icmp6len < sizeof(struct nd_neighbor_solicit))
811 goto badlen;
812 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
813 /* give up local */
814 nd6_ns_input(m, off, icmp6len);
815 m = NULL;
816 goto freeit;
817 }
818 nd6_ns_input(n, off, icmp6len);
819 /* m stays. */
820 break;
821
822 case ND_NEIGHBOR_ADVERT:
823 icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert);
824 if (code != 0)
825 goto badcode;
826 if (icmp6len < sizeof(struct nd_neighbor_advert))
827 goto badlen;
828 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
829 /* give up local */
830 nd6_na_input(m, off, icmp6len);
831 m = NULL;
832 goto freeit;
833 }
834 nd6_na_input(n, off, icmp6len);
835 /* m stays. */
836 break;
837
838 case ND_REDIRECT:
839 icmp6_ifstat_inc(rcvif, ifs6_in_redirect);
840 if (code != 0)
841 goto badcode;
842 if (icmp6len < sizeof(struct nd_redirect))
843 goto badlen;
844 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
845 /* give up local */
846 icmp6_redirect_input(m, off);
847 m = NULL;
848 goto freeit;
849 }
850 icmp6_redirect_input(n, off);
851 /* m stays. */
852 break;
853
854 case ICMP6_ROUTER_RENUMBERING:
855 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
856 code != ICMP6_ROUTER_RENUMBERING_RESULT)
857 goto badcode;
858 if (icmp6len < sizeof(struct icmp6_router_renum))
859 goto badlen;
860 break;
861
862 default:
863 nd6log(LOG_DEBUG, "unknown type %d(src=%s, dst=%s, ifid=%d)\n",
864 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
865 ip6_sprintf(&ip6->ip6_dst),
866 rcvif ? rcvif->if_index : 0);
867 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
868 /* ICMPv6 error: MUST deliver it by spec... */
869 code = PRC_NCMDS;
870 /* deliver */
871 } else {
872 /* ICMPv6 informational: MUST not deliver */
873 break;
874 }
875 deliver:
876 if (icmp6_notify_error(m, off, icmp6len, code)) {
877 /* In this case, m should've been freed. */
878 m_put_rcvif_psref(rcvif, &psref);
879 return (IPPROTO_DONE);
880 }
881 break;
882
883 badcode:
884 ICMP6_STATINC(ICMP6_STAT_BADCODE);
885 break;
886
887 badlen:
888 ICMP6_STATINC(ICMP6_STAT_BADLEN);
889 break;
890 }
891 m_put_rcvif_psref(rcvif, &psref);
892
893 /* deliver the packet to appropriate sockets */
894 icmp6_rip6_input(&m, *offp);
895
896 return IPPROTO_DONE;
897
898 freeit:
899 m_put_rcvif_psref(rcvif, &psref);
900 m_freem(m);
901 return IPPROTO_DONE;
902}
903
904static int
905icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code)
906{
907 struct icmp6_hdr *icmp6;
908 struct ip6_hdr *eip6;
909 u_int32_t notifymtu;
910 struct sockaddr_in6 icmp6src, icmp6dst;
911
912 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
913 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
914 goto freeit;
915 }
916 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
917 sizeof(*icmp6) + sizeof(struct ip6_hdr));
918 if (icmp6 == NULL) {
919 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
920 return (-1);
921 }
922 eip6 = (struct ip6_hdr *)(icmp6 + 1);
923
924 /* Detect the upper level protocol */
925 {
926 void (*ctlfunc)(int, struct sockaddr *, void *);
927 u_int8_t nxt = eip6->ip6_nxt;
928 int eoff = off + sizeof(struct icmp6_hdr) +
929 sizeof(struct ip6_hdr);
930 struct ip6ctlparam ip6cp;
931 struct in6_addr *finaldst = NULL;
932 int icmp6type = icmp6->icmp6_type;
933 struct ip6_frag *fh;
934 struct ip6_rthdr *rth;
935 struct ip6_rthdr0 *rth0;
936 int rthlen;
937 struct ifnet *rcvif;
938 int s;
939
940 while (1) { /* XXX: should avoid infinite loop explicitly? */
941 struct ip6_ext *eh;
942
943 switch (nxt) {
944 case IPPROTO_HOPOPTS:
945 case IPPROTO_DSTOPTS:
946 case IPPROTO_AH:
947 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
948 eoff, sizeof(*eh));
949 if (eh == NULL) {
950 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
951 return (-1);
952 }
953
954 if (nxt == IPPROTO_AH)
955 eoff += (eh->ip6e_len + 2) << 2;
956 else
957 eoff += (eh->ip6e_len + 1) << 3;
958 nxt = eh->ip6e_nxt;
959 break;
960 case IPPROTO_ROUTING:
961 /*
962 * When the erroneous packet contains a
963 * routing header, we should examine the
964 * header to determine the final destination.
965 * Otherwise, we can't properly update
966 * information that depends on the final
967 * destination (e.g. path MTU).
968 */
969 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
970 eoff, sizeof(*rth));
971 if (rth == NULL) {
972 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
973 return (-1);
974 }
975 rthlen = (rth->ip6r_len + 1) << 3;
976 /*
977 * XXX: currently there is no
978 * officially defined type other
979 * than type-0.
980 * Note that if the segment left field
981 * is 0, all intermediate hops must
982 * have been passed.
983 */
984 if (rth->ip6r_segleft &&
985 rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
986 int hops;
987
988 IP6_EXTHDR_GET(rth0,
989 struct ip6_rthdr0 *, m,
990 eoff, rthlen);
991 if (rth0 == NULL) {
992 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
993 return (-1);
994 }
995 /* just ignore a bogus header */
996 if ((rth0->ip6r0_len % 2) == 0 &&
997 (hops = rth0->ip6r0_len/2))
998 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
999 }
1000 eoff += rthlen;
1001 nxt = rth->ip6r_nxt;
1002 break;
1003 case IPPROTO_FRAGMENT:
1004 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
1005 eoff, sizeof(*fh));
1006 if (fh == NULL) {
1007 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
1008 return (-1);
1009 }
1010 /*
1011 * Data after a fragment header is meaningless
1012 * unless it is the first fragment, but
1013 * we'll go to the notify label for path MTU
1014 * discovery.
1015 */
1016 if (fh->ip6f_offlg & IP6F_OFF_MASK)
1017 goto notify;
1018
1019 eoff += sizeof(struct ip6_frag);
1020 nxt = fh->ip6f_nxt;
1021 break;
1022 default:
1023 /*
1024 * This case includes ESP and the No Next
1025 * Header. In such cases going to the notify
1026 * label does not have any meaning
1027 * (i.e. ctlfunc will be NULL), but we go
1028 * anyway since we might have to update
1029 * path MTU information.
1030 */
1031 goto notify;
1032 }
1033 }
1034 notify:
1035 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1036 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1037 if (icmp6 == NULL) {
1038 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
1039 return (-1);
1040 }
1041
1042 /*
1043 * retrieve parameters from the inner IPv6 header, and convert
1044 * them into sockaddr structures.
1045 * XXX: there is no guarantee that the source or destination
1046 * addresses of the inner packet are in the same scope zone as
1047 * the addresses of the icmp packet. But there is no other
1048 * way to determine the zone.
1049 */
1050 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1051
1052 rcvif = m_get_rcvif(m, &s);
1053 sockaddr_in6_init(&icmp6dst,
1054 (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0);
1055 if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) {
1056 m_put_rcvif(rcvif, &s);
1057 goto freeit;
1058 }
1059 sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0);
1060 if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) {
1061 m_put_rcvif(rcvif, &s);
1062 goto freeit;
1063 }
1064 m_put_rcvif(rcvif, &s);
1065
1066 icmp6src.sin6_flowinfo =
1067 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1068
1069 if (finaldst == NULL)
1070 finaldst = &eip6->ip6_dst;
1071 ip6cp.ip6c_m = m;
1072 ip6cp.ip6c_icmp6 = icmp6;
1073 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1074 ip6cp.ip6c_off = eoff;
1075 ip6cp.ip6c_finaldst = finaldst;
1076 ip6cp.ip6c_src = &icmp6src;
1077 ip6cp.ip6c_nxt = nxt;
1078
1079 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1080 notifymtu = ntohl(icmp6->icmp6_mtu);
1081 ip6cp.ip6c_cmdarg = (void *)&notifymtu;
1082 }
1083
1084 ctlfunc = (void (*)(int, struct sockaddr *, void *))
1085 (inet6sw[ip6_protox[nxt]].pr_ctlinput);
1086 if (ctlfunc) {
1087 (void) (*ctlfunc)(code, sin6tosa(&icmp6dst),
1088 &ip6cp);
1089 }
1090 }
1091 return (0);
1092
1093 freeit:
1094 m_freem(m);
1095 return (-1);
1096}
1097
1098void
1099icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1100{
1101 unsigned long rtcount;
1102 struct icmp6_mtudisc_callback *mc;
1103 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1104 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1105 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1106 u_int mtu = ntohl(icmp6->icmp6_mtu);
1107 struct rtentry *rt = NULL;
1108 struct sockaddr_in6 sin6;
1109 struct ifnet *rcvif;
1110 int s;
1111
1112 /*
1113 * The MTU should not be less than the minimal IPv6 MTU except for the
1114 * hack in ip6_output/ip6_setpmtu where we always include a frag header.
1115 * In that one case, the MTU might be less than 1280.
1116 */
1117 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) {
1118 /* is the mtu even sane? */
1119 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
1120 return;
1121 if (!validated)
1122 return;
1123 mtu = IPV6_MMTU - sizeof(struct ip6_frag);
1124 }
1125
1126 /*
1127 * allow non-validated cases if memory is plenty, to make traffic
1128 * from non-connected pcb happy.
1129 */
1130 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q);
1131 if (validated) {
1132 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat)
1133 return;
1134 else if (0 <= icmp6_mtudisc_lowat &&
1135 rtcount > icmp6_mtudisc_lowat) {
1136 /*
1137 * XXX nuke a victim, install the new one.
1138 */
1139 }
1140 } else {
1141 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat)
1142 return;
1143 }
1144
1145 memset(&sin6, 0, sizeof(sin6));
1146 sin6.sin6_family = PF_INET6;
1147 sin6.sin6_len = sizeof(struct sockaddr_in6);
1148 sin6.sin6_addr = *dst;
1149 rcvif = m_get_rcvif(m, &s);
1150 if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) {
1151 m_put_rcvif(rcvif, &s);
1152 return;
1153 }
1154 m_put_rcvif(rcvif, &s);
1155
1156 rt = icmp6_mtudisc_clone(sin6tosa(&sin6));
1157
1158 if (rt && (rt->rt_flags & RTF_HOST) &&
1159 !(rt->rt_rmx.rmx_locks & RTV_MTU) &&
1160 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) {
1161 if (mtu < IN6_LINKMTU(rt->rt_ifp)) {
1162 ICMP6_STATINC(ICMP6_STAT_PMTUCHG);
1163 rt->rt_rmx.rmx_mtu = mtu;
1164 }
1165 }
1166 if (rt) {
1167 rtfree(rt);
1168 }
1169
1170 /*
1171 * Notify protocols that the MTU for this destination
1172 * has changed.
1173 */
1174 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL;
1175 mc = LIST_NEXT(mc, mc_list))
1176 (*mc->mc_func)(&sin6.sin6_addr);
1177}
1178
1179/*
1180 * Process a Node Information Query packet, based on
1181 * draft-ietf-ipngwg-icmp-name-lookups-07.
1182 *
1183 * Spec incompatibilities:
1184 * - IPv6 Subject address handling
1185 * - IPv4 Subject address handling support missing
1186 * - Proxy reply (answer even if it's not for me)
1187 * - joins NI group address at in6_ifattach() time only, does not cope
1188 * with hostname changes by sethostname(3)
1189 */
1190static struct mbuf *
1191ni6_input(struct mbuf *m, int off)
1192{
1193 struct icmp6_nodeinfo *ni6, *nni6;
1194 struct mbuf *n = NULL;
1195 u_int16_t qtype;
1196 int subjlen;
1197 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1198 struct ni_reply_fqdn *fqdn;
1199 int addrs; /* for NI_QTYPE_NODEADDR */
1200 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1201 struct sockaddr_in6 sin6; /* ip6_dst */
1202 struct in6_addr in6_subj; /* subject address */
1203 struct ip6_hdr *ip6;
1204 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1205 char *subj = NULL;
1206 struct ifnet *rcvif;
1207 int s, ss;
1208 struct ifaddr *ifa;
1209 struct psref psref;
1210
1211 ip6 = mtod(m, struct ip6_hdr *);
1212 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1213 if (ni6 == NULL) {
1214 /* m is already reclaimed */
1215 return NULL;
1216 }
1217
1218 /*
1219 * Validate IPv6 destination address.
1220 *
1221 * The Responder must discard the Query without further processing
1222 * unless it is one of the Responder's unicast or anycast addresses, or
1223 * a link-local scope multicast address which the Responder has joined.
1224 * [icmp-name-lookups-07, Section 4.]
1225 */
1226 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0);
1227 /* XXX scopeid */
1228 ss = pserialize_read_enter();
1229 ifa = ifa_ifwithaddr(sin6tosa(&sin6));
1230 if (ifa != NULL)
1231 ; /* unicast/anycast, fine */
1232 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr))
1233 ; /* link-local multicast, fine */
1234 else {
1235 pserialize_read_exit(ss);
1236 goto bad;
1237 }
1238 pserialize_read_exit(ss);
1239
1240 /* validate query Subject field. */
1241 qtype = ntohs(ni6->ni_qtype);
1242 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1243 switch (qtype) {
1244 case NI_QTYPE_NOOP:
1245 case NI_QTYPE_SUPTYPES:
1246 /* 07 draft */
1247 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1248 break;
1249 /* FALLTHROUGH */
1250 case NI_QTYPE_FQDN:
1251 case NI_QTYPE_NODEADDR:
1252 case NI_QTYPE_IPV4ADDR:
1253 switch (ni6->ni_code) {
1254 case ICMP6_NI_SUBJ_IPV6:
1255#if ICMP6_NI_SUBJ_IPV6 != 0
1256 case 0:
1257#endif
1258 /*
1259 * backward compatibility - try to accept 03 draft
1260 * format, where no Subject is present.
1261 */
1262 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1263 subjlen == 0) {
1264 oldfqdn++;
1265 break;
1266 }
1267#if ICMP6_NI_SUBJ_IPV6 != 0
1268 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1269 goto bad;
1270#endif
1271
1272 if (subjlen != sizeof(sin6.sin6_addr))
1273 goto bad;
1274
1275 /*
1276 * Validate Subject address.
1277 *
1278 * Not sure what exactly "address belongs to the node"
1279 * means in the spec, is it just unicast, or what?
1280 *
1281 * At this moment we consider Subject address as
1282 * "belong to the node" if the Subject address equals
1283 * to the IPv6 destination address; validation for
1284 * IPv6 destination address should have done enough
1285 * check for us.
1286 *
1287 * We do not do proxy at this moment.
1288 */
1289 /* m_pulldown instead of copy? */
1290 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1291 subjlen, (void *)&in6_subj);
1292 rcvif = m_get_rcvif(m, &s);
1293 if (in6_setscope(&in6_subj, rcvif, NULL)) {
1294 m_put_rcvif(rcvif, &s);
1295 goto bad;
1296 }
1297 m_put_rcvif(rcvif, &s);
1298
1299 subj = (char *)&in6_subj;
1300 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
1301 break;
1302
1303 /*
1304 * XXX if we are to allow other cases, we should really
1305 * be careful about scope here.
1306 * basically, we should disallow queries toward IPv6
1307 * destination X with subject Y, if scope(X) > scope(Y).
1308 * if we allow scope(X) > scope(Y), it will result in
1309 * information leakage across scope boundary.
1310 */
1311 goto bad;
1312
1313 case ICMP6_NI_SUBJ_FQDN:
1314 /*
1315 * Validate Subject name with gethostname(3).
1316 *
1317 * The behavior may need some debate, since:
1318 * - we are not sure if the node has FQDN as
1319 * hostname (returned by gethostname(3)).
1320 * - the code does wildcard match for truncated names.
1321 * however, we are not sure if we want to perform
1322 * wildcard match, if gethostname(3) side has
1323 * truncated hostname.
1324 */
1325 n = ni6_nametodns(hostname, hostnamelen, 0);
1326 if (!n || n->m_next || n->m_len == 0)
1327 goto bad;
1328 IP6_EXTHDR_GET(subj, char *, m,
1329 off + sizeof(struct icmp6_nodeinfo), subjlen);
1330 if (subj == NULL)
1331 goto bad;
1332 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1333 n->m_len)) {
1334 goto bad;
1335 }
1336 m_freem(n);
1337 n = NULL;
1338 break;
1339
1340 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1341 default:
1342 goto bad;
1343 }
1344 break;
1345 }
1346
1347 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1348 switch (qtype) {
1349 case NI_QTYPE_FQDN:
1350 if ((icmp6_nodeinfo & 1) == 0)
1351 goto bad;
1352 break;
1353 case NI_QTYPE_NODEADDR:
1354 case NI_QTYPE_IPV4ADDR:
1355 if ((icmp6_nodeinfo & 2) == 0)
1356 goto bad;
1357 break;
1358 }
1359
1360 /* guess reply length */
1361 switch (qtype) {
1362 case NI_QTYPE_NOOP:
1363 break; /* no reply data */
1364 case NI_QTYPE_SUPTYPES:
1365 replylen += sizeof(u_int32_t);
1366 break;
1367 case NI_QTYPE_FQDN:
1368 /* XXX will append an mbuf */
1369 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1370 break;
1371 case NI_QTYPE_NODEADDR:
1372 addrs = ni6_addrs(ni6, m, &ifp, subj, &psref);
1373 if ((replylen += addrs * (sizeof(struct in6_addr) +
1374 sizeof(u_int32_t))) > MCLBYTES)
1375 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1376 break;
1377 case NI_QTYPE_IPV4ADDR:
1378 /* unsupported - should respond with unknown Qtype? */
1379 goto bad;
1380 default:
1381 /*
1382 * XXX: We must return a reply with the ICMP6 code
1383 * `unknown Qtype' in this case. However we regard the case
1384 * as an FQDN query for backward compatibility.
1385 * Older versions set a random value to this field,
1386 * so it rarely varies in the defined qtypes.
1387 * But the mechanism is not reliable...
1388 * maybe we should obsolete older versions.
1389 */
1390 qtype = NI_QTYPE_FQDN;
1391 /* XXX will append an mbuf */
1392 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1393 oldfqdn++;
1394 break;
1395 }
1396
1397 /* allocate an mbuf to reply. */
1398 MGETHDR(n, M_DONTWAIT, m->m_type);
1399 if (n == NULL) {
1400 if_put(ifp, &psref);
1401 m_freem(m);
1402 return (NULL);
1403 }
1404 M_MOVE_PKTHDR(n, m); /* just for rcvif */
1405 if (replylen > MHLEN) {
1406 if (replylen > MCLBYTES) {
1407 /*
1408 * XXX: should we try to allocate more? But MCLBYTES
1409 * is probably much larger than IPV6_MMTU...
1410 */
1411 goto bad;
1412 }
1413 MCLGET(n, M_DONTWAIT);
1414 if ((n->m_flags & M_EXT) == 0) {
1415 goto bad;
1416 }
1417 }
1418 n->m_pkthdr.len = n->m_len = replylen;
1419
1420 /* copy mbuf header and IPv6 + Node Information base headers */
1421 bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr));
1422 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1423 bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo));
1424
1425 /* qtype dependent procedure */
1426 switch (qtype) {
1427 case NI_QTYPE_NOOP:
1428 nni6->ni_code = ICMP6_NI_SUCCESS;
1429 nni6->ni_flags = 0;
1430 break;
1431 case NI_QTYPE_SUPTYPES:
1432 {
1433 u_int32_t v;
1434 nni6->ni_code = ICMP6_NI_SUCCESS;
1435 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1436 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1437 v = (u_int32_t)htonl(0x0000000f);
1438 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1439 break;
1440 }
1441 case NI_QTYPE_FQDN:
1442 nni6->ni_code = ICMP6_NI_SUCCESS;
1443 fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) +
1444 sizeof(struct ip6_hdr) +
1445 sizeof(struct icmp6_nodeinfo));
1446 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1447 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1448 /*
1449 * XXX do we really have FQDN in variable "hostname"?
1450 */
1451 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1452 if (n->m_next == NULL)
1453 goto bad;
1454 /* XXX we assume that n->m_next is not a chain */
1455 if (n->m_next->m_next != NULL)
1456 goto bad;
1457 n->m_pkthdr.len += n->m_next->m_len;
1458 break;
1459 case NI_QTYPE_NODEADDR:
1460 {
1461 int lenlim, copied;
1462
1463 nni6->ni_code = ICMP6_NI_SUCCESS;
1464 n->m_pkthdr.len = n->m_len =
1465 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1466 lenlim = M_TRAILINGSPACE(n);
1467 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1468 if_put(ifp, &psref);
1469 ifp = NULL;
1470 /* XXX: reset mbuf length */
1471 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1472 sizeof(struct icmp6_nodeinfo) + copied;
1473 break;
1474 }
1475 default:
1476 break; /* XXX impossible! */
1477 }
1478
1479 nni6->ni_type = ICMP6_NI_REPLY;
1480 m_freem(m);
1481 return (n);
1482
1483 bad:
1484 if_put(ifp, &psref);
1485 m_freem(m);
1486 if (n)
1487 m_freem(n);
1488 return (NULL);
1489}
1490#undef hostnamelen
1491
1492#define isupper(x) ('A' <= (x) && (x) <= 'Z')
1493#define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z'))
1494#define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9'))
1495#define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x))
1496
1497/*
1498 * make a mbuf with DNS-encoded string. no compression support.
1499 *
1500 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1501 * treated as truncated name (two \0 at the end). this is a wild guess.
1502 *
1503 * old - return pascal string if non-zero
1504 */
1505static struct mbuf *
1506ni6_nametodns(const char *name, int namelen, int old)
1507{
1508 struct mbuf *m;
1509 char *cp, *ep;
1510 const char *p, *q;
1511 int i, len, nterm;
1512
1513 if (old)
1514 len = namelen + 1;
1515 else
1516 len = MCLBYTES;
1517
1518 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1519 MGET(m, M_DONTWAIT, MT_DATA);
1520 if (m && len > MLEN) {
1521 MCLGET(m, M_DONTWAIT);
1522 if ((m->m_flags & M_EXT) == 0)
1523 goto fail;
1524 }
1525 if (!m)
1526 goto fail;
1527 m->m_next = NULL;
1528
1529 if (old) {
1530 m->m_len = len;
1531 *mtod(m, char *) = namelen;
1532 bcopy(name, mtod(m, char *) + 1, namelen);
1533 return m;
1534 } else {
1535 m->m_len = 0;
1536 cp = mtod(m, char *);
1537 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1538
1539 /* if not certain about my name, return empty buffer */
1540 if (namelen == 0)
1541 return m;
1542
1543 /*
1544 * guess if it looks like shortened hostname, or FQDN.
1545 * shortened hostname needs two trailing "\0".
1546 */
1547 i = 0;
1548 for (p = name; p < name + namelen; p++) {
1549 if (*p == '.')
1550 i++;
1551 }
1552 if (i < 2)
1553 nterm = 2;
1554 else
1555 nterm = 1;
1556
1557 p = name;
1558 while (cp < ep && p < name + namelen) {
1559 i = 0;
1560 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1561 i++;
1562 /* result does not fit into mbuf */
1563 if (cp + i + 1 >= ep)
1564 goto fail;
1565 /*
1566 * DNS label length restriction, RFC1035 page 8.
1567 * "i == 0" case is included here to avoid returning
1568 * 0-length label on "foo..bar".
1569 */
1570 if (i <= 0 || i >= 64)
1571 goto fail;
1572 *cp++ = i;
1573 if (!isalpha(p[0]) || !isalnum(p[i - 1]))
1574 goto fail;
1575 while (i > 0) {
1576 if (!isalnum(*p) && *p != '-')
1577 goto fail;
1578 if (isupper(*p)) {
1579 *cp++ = tolower(*p);
1580 p++;
1581 } else
1582 *cp++ = *p++;
1583 i--;
1584 }
1585 p = q;
1586 if (p < name + namelen && *p == '.')
1587 p++;
1588 }
1589 /* termination */
1590 if (cp + nterm >= ep)
1591 goto fail;
1592 while (nterm-- > 0)
1593 *cp++ = '\0';
1594 m->m_len = cp - mtod(m, char *);
1595 return m;
1596 }
1597
1598 panic("should not reach here");
1599 /* NOTREACHED */
1600
1601 fail:
1602 if (m)
1603 m_freem(m);
1604 return NULL;
1605}
1606
1607/*
1608 * check if two DNS-encoded string matches. takes care of truncated
1609 * form (with \0\0 at the end). no compression support.
1610 * XXX upper/lowercase match (see RFC2065)
1611 */
1612static int
1613ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1614{
1615 const char *a0, *b0;
1616 int l;
1617
1618 /* simplest case - need validation? */
1619 if (alen == blen && memcmp(a, b, alen) == 0)
1620 return 1;
1621
1622 a0 = a;
1623 b0 = b;
1624
1625 /* termination is mandatory */
1626 if (alen < 2 || blen < 2)
1627 return 0;
1628 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1629 return 0;
1630 alen--;
1631 blen--;
1632
1633 while (a - a0 < alen && b - b0 < blen) {
1634 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1635 return 0;
1636
1637 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1638 return 0;
1639 /* we don't support compression yet */
1640 if (a[0] >= 64 || b[0] >= 64)
1641 return 0;
1642
1643 /* truncated case */
1644 if (a[0] == 0 && a - a0 == alen - 1)
1645 return 1;
1646 if (b[0] == 0 && b - b0 == blen - 1)
1647 return 1;
1648 if (a[0] == 0 || b[0] == 0)
1649 return 0;
1650
1651 if (a[0] != b[0])
1652 return 0;
1653 l = a[0];
1654 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1655 return 0;
1656 if (memcmp(a + 1, b + 1, l) != 0)
1657 return 0;
1658
1659 a += 1 + l;
1660 b += 1 + l;
1661 }
1662
1663 if (a - a0 == alen && b - b0 == blen)
1664 return 1;
1665 else
1666 return 0;
1667}
1668
1669/*
1670 * calculate the number of addresses to be returned in the node info reply.
1671 */
1672static int
1673ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m,
1674 struct ifnet **ifpp, char *subj, struct psref *psref)
1675{
1676 struct ifnet *ifp;
1677 struct in6_ifaddr *ia6;
1678 struct ifaddr *ifa;
1679 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
1680 int addrs = 0, addrsofif, iffound = 0;
1681 int niflags = ni6->ni_flags;
1682 int s;
1683
1684 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1685 switch (ni6->ni_code) {
1686 case ICMP6_NI_SUBJ_IPV6:
1687 if (subj == NULL) /* must be impossible... */
1688 return (0);
1689 subj_ip6 = (struct sockaddr_in6 *)subj;
1690 break;
1691 default:
1692 /*
1693 * XXX: we only support IPv6 subject address for
1694 * this Qtype.
1695 */
1696 return (0);
1697 }
1698 }
1699
1700 s = pserialize_read_enter();
1701 IFNET_READER_FOREACH(ifp) {
1702 addrsofif = 0;
1703 IFADDR_READER_FOREACH(ifa, ifp) {
1704 if (ifa->ifa_addr->sa_family != AF_INET6)
1705 continue;
1706 ia6 = (struct in6_ifaddr *)ifa;
1707
1708 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1709 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
1710 &ia6->ia_addr.sin6_addr))
1711 iffound = 1;
1712
1713 /*
1714 * IPv4-mapped addresses can only be returned by a
1715 * Node Information proxy, since they represent
1716 * addresses of IPv4-only nodes, which perforce do
1717 * not implement this protocol.
1718 * [icmp-name-lookups-07, Section 5.4]
1719 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1720 * this function at this moment.
1721 */
1722
1723 /* What do we have to do about ::1? */
1724 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) {
1725 case IPV6_ADDR_SCOPE_LINKLOCAL:
1726 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1727 continue;
1728 break;
1729 case IPV6_ADDR_SCOPE_SITELOCAL:
1730 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1731 continue;
1732 break;
1733 case IPV6_ADDR_SCOPE_GLOBAL:
1734 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1735 continue;
1736 break;
1737 default:
1738 continue;
1739 }
1740
1741 /*
1742 * check if anycast is okay.
1743 * XXX: just experimental. not in the spec.
1744 */
1745 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1746 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1747 continue; /* we need only unicast addresses */
1748
1749 addrsofif++; /* count the address */
1750 }
1751 if (iffound) {
1752 if_acquire_NOMPSAFE(ifp, psref);
1753 pserialize_read_exit(s);
1754 *ifpp = ifp;
1755 return (addrsofif);
1756 }
1757
1758 addrs += addrsofif;
1759 }
1760 pserialize_read_exit(s);
1761
1762 return (addrs);
1763}
1764
1765static int
1766ni6_store_addrs(struct icmp6_nodeinfo *ni6,
1767 struct icmp6_nodeinfo *nni6, struct ifnet *ifp0,
1768 int resid)
1769{
1770 struct ifnet *ifp;
1771 struct in6_ifaddr *ia6;
1772 struct ifaddr *ifa;
1773 struct ifnet *ifp_dep = NULL;
1774 int copied = 0, allow_deprecated = 0;
1775 u_char *cp = (u_char *)(nni6 + 1);
1776 int niflags = ni6->ni_flags;
1777 u_int32_t ltime;
1778 int s;
1779
1780 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1781 return (0); /* needless to copy */
1782
1783 s = pserialize_read_enter();
1784 ifp = ifp0 ? ifp0 : IFNET_READER_FIRST();
1785 again:
1786
1787 for (; ifp; ifp = IFNET_READER_NEXT(ifp))
1788 {
1789 IFADDR_READER_FOREACH(ifa, ifp) {
1790 if (ifa->ifa_addr->sa_family != AF_INET6)
1791 continue;
1792 ia6 = (struct in6_ifaddr *)ifa;
1793
1794 if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
1795 allow_deprecated == 0) {
1796 /*
1797 * prefererred address should be put before
1798 * deprecated addresses.
1799 */
1800
1801 /* record the interface for later search */
1802 if (ifp_dep == NULL)
1803 ifp_dep = ifp;
1804
1805 continue;
1806 }
1807 else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
1808 allow_deprecated != 0)
1809 continue; /* we now collect deprecated addrs */
1810
1811 /* What do we have to do about ::1? */
1812 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) {
1813 case IPV6_ADDR_SCOPE_LINKLOCAL:
1814 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1815 continue;
1816 break;
1817 case IPV6_ADDR_SCOPE_SITELOCAL:
1818 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1819 continue;
1820 break;
1821 case IPV6_ADDR_SCOPE_GLOBAL:
1822 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1823 continue;
1824 break;
1825 default:
1826 continue;
1827 }
1828
1829 /*
1830 * check if anycast is okay.
1831 * XXX: just experimental. not in the spec.
1832 */
1833 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1834 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1835 continue;
1836
1837 /* now we can copy the address */
1838 if (resid < sizeof(struct in6_addr) +
1839 sizeof(u_int32_t)) {
1840 /*
1841 * We give up much more copy.
1842 * Set the truncate flag and return.
1843 */
1844 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE;
1845 goto out;
1846 }
1847
1848 /*
1849 * Set the TTL of the address.
1850 * The TTL value should be one of the following
1851 * according to the specification:
1852 *
1853 * 1. The remaining lifetime of a DHCP lease on the
1854 * address, or
1855 * 2. The remaining Valid Lifetime of a prefix from
1856 * which the address was derived through Stateless
1857 * Autoconfiguration.
1858 *
1859 * Note that we currently do not support stateful
1860 * address configuration by DHCPv6, so the former
1861 * case can't happen.
1862 *
1863 * TTL must be 2^31 > TTL >= 0.
1864 */
1865 if (ia6->ia6_lifetime.ia6t_expire == 0)
1866 ltime = ND6_INFINITE_LIFETIME;
1867 else {
1868 if (ia6->ia6_lifetime.ia6t_expire >
1869 time_uptime)
1870 ltime = ia6->ia6_lifetime.ia6t_expire -
1871 time_uptime;
1872 else
1873 ltime = 0;
1874 }
1875 if (ltime > 0x7fffffff)
1876 ltime = 0x7fffffff;
1877 ltime = htonl(ltime);
1878
1879 bcopy(&ltime, cp, sizeof(u_int32_t));
1880 cp += sizeof(u_int32_t);
1881
1882 /* copy the address itself */
1883 bcopy(&ia6->ia_addr.sin6_addr, cp,
1884 sizeof(struct in6_addr));
1885 in6_clearscope((struct in6_addr *)cp); /* XXX */
1886 cp += sizeof(struct in6_addr);
1887
1888 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1889 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t));
1890 }
1891 if (ifp0) /* we need search only on the specified IF */
1892 break;
1893 }
1894
1895 if (allow_deprecated == 0 && ifp_dep != NULL) {
1896 ifp = ifp_dep;
1897 allow_deprecated = 1;
1898
1899 goto again;
1900 }
1901out:
1902 pserialize_read_exit(s);
1903 return (copied);
1904}
1905
1906/*
1907 * XXX almost dup'ed code with rip6_input.
1908 */
1909static int
1910icmp6_rip6_input(struct mbuf **mp, int off)
1911{
1912 struct mbuf *m = *mp;
1913 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1914 struct inpcb_hdr *inph;
1915 struct in6pcb *in6p;
1916 struct in6pcb *last = NULL;
1917 struct sockaddr_in6 rip6src;
1918 struct icmp6_hdr *icmp6;
1919 struct mbuf *opts = NULL;
1920
1921 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1922 if (icmp6 == NULL) {
1923 /* m is already reclaimed */
1924 return IPPROTO_DONE;
1925 }
1926
1927 /*
1928 * XXX: the address may have embedded scope zone ID, which should be
1929 * hidden from applications.
1930 */
1931 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0);
1932 if (sa6_recoverscope(&rip6src)) {
1933 m_freem(m);
1934 return (IPPROTO_DONE);
1935 }
1936
1937 TAILQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) {
1938 in6p = (struct in6pcb *)inph;
1939 if (in6p->in6p_af != AF_INET6)
1940 continue;
1941 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6)
1942 continue;
1943 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1944 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1945 continue;
1946 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1947 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1948 continue;
1949 if (in6p->in6p_icmp6filt
1950 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1951 in6p->in6p_icmp6filt))
1952 continue;
1953 if (last) {
1954 struct mbuf *n;
1955 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1956 if (last->in6p_flags & IN6P_CONTROLOPTS)
1957 ip6_savecontrol(last, &opts, ip6, n);
1958 /* strip intermediate headers */
1959 m_adj(n, off);
1960 if (sbappendaddr(&last->in6p_socket->so_rcv,
1961 sin6tosa(&rip6src), n, opts) == 0) {
1962 /* should notify about lost packet */
1963 m_freem(n);
1964 if (opts)
1965 m_freem(opts);
1966 } else
1967 sorwakeup(last->in6p_socket);
1968 opts = NULL;
1969 }
1970 }
1971 last = in6p;
1972 }
1973 if (last) {
1974 if (last->in6p_flags & IN6P_CONTROLOPTS)
1975 ip6_savecontrol(last, &opts, ip6, m);
1976 /* strip intermediate headers */
1977 m_adj(m, off);
1978 if (sbappendaddr(&last->in6p_socket->so_rcv,
1979 sin6tosa(&rip6src), m, opts) == 0) {
1980 m_freem(m);
1981 if (opts)
1982 m_freem(opts);
1983 } else
1984 sorwakeup(last->in6p_socket);
1985 } else {
1986 m_freem(m);
1987 IP6_STATDEC(IP6_STAT_DELIVERED);
1988 }
1989 return IPPROTO_DONE;
1990}
1991
1992/*
1993 * Reflect the ip6 packet back to the source.
1994 * OFF points to the icmp6 header, counted from the top of the mbuf.
1995 *
1996 * Note: RFC 1885 required that an echo reply should be truncated if it
1997 * did not fit in with (return) path MTU, and KAME code supported the
1998 * behavior. However, as a clarification after the RFC, this limitation
1999 * was removed in a revised version of the spec, RFC 2463. We had kept the
2000 * old behavior, with a (non-default) ifdef block, while the new version of
2001 * the spec was an internet-draft status, and even after the new RFC was
2002 * published. But it would rather make sense to clean the obsoleted part
2003 * up, and to make the code simpler at this stage.
2004 */
2005void
2006icmp6_reflect(struct mbuf *m, size_t off)
2007{
2008 struct ip6_hdr *ip6;
2009 struct icmp6_hdr *icmp6;
2010 const struct in6_ifaddr *ia;
2011 const struct ip6aux *ip6a;
2012 int plen;
2013 int type, code;
2014 struct ifnet *outif = NULL;
2015 struct in6_addr origdst;
2016 struct ifnet *rcvif;
2017 int s;
2018 bool ip6_src_filled = false;
2019
2020 /* too short to reflect */
2021 if (off < sizeof(struct ip6_hdr)) {
2022 nd6log(LOG_DEBUG,
2023 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2024 (u_long)off, (u_long)sizeof(struct ip6_hdr),
2025 __FILE__, __LINE__);
2026 goto bad;
2027 }
2028
2029 /*
2030 * If there are extra headers between IPv6 and ICMPv6, strip
2031 * off that header first.
2032 */
2033#ifdef DIAGNOSTIC
2034 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
2035 panic("assumption failed in icmp6_reflect");
2036#endif
2037 if (off > sizeof(struct ip6_hdr)) {
2038 size_t l;
2039 struct ip6_hdr nip6;
2040
2041 l = off - sizeof(struct ip6_hdr);
2042 m_copydata(m, 0, sizeof(nip6), (void *)&nip6);
2043 m_adj(m, l);
2044 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2045 if (m->m_len < l) {
2046 if ((m = m_pullup(m, l)) == NULL)
2047 return;
2048 }
2049 bcopy((void *)&nip6, mtod(m, void *), sizeof(nip6));
2050 } else /* off == sizeof(struct ip6_hdr) */ {
2051 size_t l;
2052 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2053 if (m->m_len < l) {
2054 if ((m = m_pullup(m, l)) == NULL)
2055 return;
2056 }
2057 }
2058 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
2059 ip6 = mtod(m, struct ip6_hdr *);
2060 ip6->ip6_nxt = IPPROTO_ICMPV6;
2061 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
2062 type = icmp6->icmp6_type; /* keep type for statistics */
2063 code = icmp6->icmp6_code; /* ditto. */
2064
2065 origdst = ip6->ip6_dst;
2066 /*
2067 * ip6_input() drops a packet if its src is multicast.
2068 * So, the src is never multicast.
2069 */
2070 ip6->ip6_dst = ip6->ip6_src;
2071
2072 /*
2073 * If the incoming packet was addressed directly to us (i.e. unicast),
2074 * use dst as the src for the reply.
2075 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
2076 * (for example) when we encounter an error while forwarding procedure
2077 * destined to a duplicated address of ours.
2078 * Note that ip6_getdstifaddr() may fail if we are in an error handling
2079 * procedure of an outgoing packet of our own, in which case we need
2080 * to search in the ifaddr list.
2081 */
2082 if (IN6_IS_ADDR_MULTICAST(&origdst))
2083 ;
2084 else if ((ip6a = ip6_getdstifaddr(m)) != NULL) {
2085 if ((ip6a->ip6a_flags &
2086 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2087 ip6->ip6_src = ip6a->ip6a_src;
2088 ip6_src_filled = true;
2089 }
2090 } else {
2091 union {
2092 struct sockaddr_in6 sin6;
2093 struct sockaddr sa;
2094 } u;
2095 int _s;
2096 struct ifaddr *ifa;
2097
2098 sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0);
2099
2100 _s = pserialize_read_enter();
2101 ifa = ifa_ifwithaddr(&u.sa);
2102
2103 if (ifa != NULL) {
2104 ia = ifatoia6(ifa);
2105 if ((ia->ia6_flags &
2106 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2107 ip6->ip6_src = ia->ia_addr.sin6_addr;
2108 ip6_src_filled = true;
2109 }
2110 }
2111 pserialize_read_exit(_s);
2112 }
2113
2114 if (!ip6_src_filled) {
2115 int e;
2116 struct sockaddr_in6 sin6;
2117 struct route ro;
2118
2119 /*
2120 * This case matches to multicasts, our anycast, or unicasts
2121 * that we do not own. Select a source address based on the
2122 * source address of the erroneous packet.
2123 */
2124 /* zone ID should be embedded */
2125 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0);
2126
2127 memset(&ro, 0, sizeof(ro));
2128 e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL,
2129 &ip6->ip6_src);
2130 rtcache_free(&ro);
2131 if (e != 0) {
2132 nd6log(LOG_DEBUG,
2133 "source can't be determined: "
2134 "dst=%s, error=%d\n",
2135 ip6_sprintf(&sin6.sin6_addr), e);
2136 goto bad;
2137 }
2138 }
2139
2140 ip6->ip6_flow = 0;
2141 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2142 ip6->ip6_vfc |= IPV6_VERSION;
2143 ip6->ip6_nxt = IPPROTO_ICMPV6;
2144 rcvif = m_get_rcvif(m, &s);
2145 if (rcvif) {
2146 /* XXX: This may not be the outgoing interface */
2147 ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim;
2148 } else
2149 ip6->ip6_hlim = ip6_defhlim;
2150 m_put_rcvif(rcvif, &s);
2151
2152 m->m_pkthdr.csum_flags = 0;
2153 icmp6->icmp6_cksum = 0;
2154 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2155 sizeof(struct ip6_hdr), plen);
2156
2157 /*
2158 * XXX option handling
2159 */
2160
2161 m->m_flags &= ~(M_BCAST|M_MCAST);
2162
2163 /*
2164 * To avoid a "too big" situation at an intermediate router
2165 * and the path MTU discovery process, specify the IPV6_MINMTU flag.
2166 * Note that only echo and node information replies are affected,
2167 * since the length of ICMP6 errors is limited to the minimum MTU.
2168 */
2169 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, &outif)
2170 != 0 && outif)
2171 icmp6_ifstat_inc(outif, ifs6_out_error);
2172 if (outif)
2173 icmp6_ifoutstat_inc(outif, type, code);
2174
2175 return;
2176
2177 bad:
2178 m_freem(m);
2179 return;
2180}
2181
2182static const char *
2183icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
2184 struct in6_addr *tgt6)
2185{
2186 static char buf[1024];
2187 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2188 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
2189 return buf;
2190}
2191
2192void
2193icmp6_redirect_input(struct mbuf *m, int off)
2194{
2195 struct ifnet *ifp;
2196 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2197 struct nd_redirect *nd_rd;
2198 int icmp6len = ntohs(ip6->ip6_plen);
2199 char *lladdr = NULL;
2200 int lladdrlen = 0;
2201 struct rtentry *rt = NULL;
2202 int is_router;
2203 int is_onlink;
2204 struct in6_addr src6 = ip6->ip6_src;
2205 struct in6_addr redtgt6;
2206 struct in6_addr reddst6;
2207 union nd_opts ndopts;
2208 struct psref psref;
2209
2210 ifp = m_get_rcvif_psref(m, &psref);
2211 if (ifp == NULL)
2212 goto freeit;
2213
2214 /* XXX if we are router, we don't update route by icmp6 redirect */
2215 if (ip6_forwarding)
2216 goto freeit;
2217 if (!icmp6_rediraccept)
2218 goto freeit;
2219
2220 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2221 if (nd_rd == NULL) {
2222 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
2223 m_put_rcvif_psref(ifp, &psref);
2224 return;
2225 }
2226 redtgt6 = nd_rd->nd_rd_target;
2227 reddst6 = nd_rd->nd_rd_dst;
2228
2229 if (in6_setscope(&redtgt6, ifp, NULL) ||
2230 in6_setscope(&reddst6, ifp, NULL)) {
2231 goto freeit;
2232 }
2233
2234 /* validation */
2235 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2236 nd6log(LOG_ERR,
2237 "ICMP6 redirect sent from %s rejected; "
2238 "must be from linklocal\n", ip6_sprintf(&src6));
2239 goto bad;
2240 }
2241 if (ip6->ip6_hlim != 255) {
2242 nd6log(LOG_ERR,
2243 "ICMP6 redirect sent from %s rejected; "
2244 "hlim=%d (must be 255)\n",
2245 ip6_sprintf(&src6), ip6->ip6_hlim);
2246 goto bad;
2247 }
2248 {
2249 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2250 struct sockaddr_in6 sin6;
2251 struct in6_addr *gw6;
2252
2253 sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0);
2254 rt = rtalloc1(sin6tosa(&sin6), 0);
2255 if (rt) {
2256 if (rt->rt_gateway == NULL ||
2257 rt->rt_gateway->sa_family != AF_INET6) {
2258 nd6log(LOG_ERR,
2259 "ICMP6 redirect rejected; no route "
2260 "with inet6 gateway found for redirect dst: %s\n",
2261 icmp6_redirect_diag(&src6, &reddst6, &redtgt6));
2262 rtfree(rt);
2263 goto bad;
2264 }
2265
2266 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2267 if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2268 nd6log(LOG_ERR,
2269 "ICMP6 redirect rejected; "
2270 "not equal to gw-for-src=%s (must be same): %s\n",
2271 ip6_sprintf(gw6),
2272 icmp6_redirect_diag(&src6, &reddst6, &redtgt6));
2273 rtfree(rt);
2274 goto bad;
2275 }
2276 } else {
2277 nd6log(LOG_ERR, "ICMP6 redirect rejected; "
2278 "no route found for redirect dst: %s\n",
2279 icmp6_redirect_diag(&src6, &reddst6, &redtgt6));
2280 goto bad;
2281 }
2282 rtfree(rt);
2283 rt = NULL;
2284 }
2285 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2286 nd6log(LOG_ERR, "ICMP6 redirect rejected; "
2287 "redirect dst must be unicast: %s\n",
2288 icmp6_redirect_diag(&src6, &reddst6, &redtgt6));
2289 goto bad;
2290 }
2291
2292 is_router = is_onlink = 0;
2293 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2294 is_router = 1; /* router case */
2295 if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2296 is_onlink = 1; /* on-link destination case */
2297 if (!is_router && !is_onlink) {
2298 nd6log(LOG_ERR, "ICMP6 redirect rejected; "
2299 "neither router case nor onlink case: %s\n",
2300 icmp6_redirect_diag(&src6, &reddst6, &redtgt6));
2301 goto bad;
2302 }
2303 /* validation passed */
2304
2305 icmp6len -= sizeof(*nd_rd);
2306 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2307 if (nd6_options(&ndopts) < 0) {
2308 nd6log(LOG_INFO, "invalid ND option, rejected: %s\n",
2309 icmp6_redirect_diag(&src6, &reddst6, &redtgt6));
2310 /* nd6_options have incremented stats */
2311 goto freeit;
2312 }
2313
2314 if (ndopts.nd_opts_tgt_lladdr) {
2315 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2316 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2317 }
2318
2319 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2320 nd6log(LOG_INFO, "lladdrlen mismatch for %s "
2321 "(if %d, icmp6 packet %d): %s\n",
2322 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
2323 icmp6_redirect_diag(&src6, &reddst6, &redtgt6));
2324 goto bad;
2325 }
2326
2327 /* RFC 2461 8.3 */
2328 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2329 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2330
2331 m_put_rcvif_psref(ifp, &psref);
2332 ifp = NULL;
2333
2334 if (!is_onlink) { /* better router case. perform rtredirect. */
2335 /* perform rtredirect */
2336 struct sockaddr_in6 sdst;
2337 struct sockaddr_in6 sgw;
2338 struct sockaddr_in6 ssrc;
2339 unsigned long rtcount;
2340 struct rtentry *newrt = NULL;
2341
2342 /*
2343 * do not install redirect route, if the number of entries
2344 * is too much (> hiwat). note that, the node (= host) will
2345 * work just fine even if we do not install redirect route
2346 * (there will be additional hops, though).
2347 */
2348 rtcount = rt_timer_count(icmp6_redirect_timeout_q);
2349 if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes)
2350 goto freeit;
2351 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat)
2352 goto freeit;
2353 else if (0 <= icmp6_redirect_lowat &&
2354 rtcount > icmp6_redirect_lowat) {
2355 /*
2356 * XXX nuke a victim, install the new one.
2357 */
2358 }
2359
2360 memset(&sdst, 0, sizeof(sdst));
2361 memset(&sgw, 0, sizeof(sgw));
2362 memset(&ssrc, 0, sizeof(ssrc));
2363 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2364 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2365 sizeof(struct sockaddr_in6);
2366 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2367 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2368 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2369 rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL,
2370 RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc),
2371 &newrt);
2372
2373 if (newrt) {
2374 (void)rt_timer_add(newrt, icmp6_redirect_timeout,
2375 icmp6_redirect_timeout_q);
2376 rtfree(newrt);
2377 }
2378 }
2379 /* finally update cached route in each socket via pfctlinput */
2380 {
2381 struct sockaddr_in6 sdst;
2382
2383 sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0);
2384 pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst));
2385#if defined(IPSEC)
2386 if (ipsec_used)
2387 key_sa_routechange(sin6tosa(&sdst));
2388#endif
2389 }
2390
2391 freeit:
2392 if (ifp != NULL)
2393 m_put_rcvif_psref(ifp, &psref);
2394 m_freem(m);
2395 return;
2396
2397 bad:
2398 m_put_rcvif_psref(ifp, &psref);
2399 ICMP6_STATINC(ICMP6_STAT_BADREDIRECT);
2400 m_freem(m);
2401}
2402
2403void
2404icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
2405{
2406 struct ifnet *ifp; /* my outgoing interface */
2407 struct in6_addr *ifp_ll6;
2408 struct in6_addr *nexthop;
2409 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2410 struct mbuf *m = NULL; /* newly allocated one */
2411 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2412 struct nd_redirect *nd_rd;
2413 size_t maxlen;
2414 u_char *p;
2415 struct sockaddr_in6 src_sa;
2416
2417 icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0);
2418
2419 /* if we are not router, we don't send icmp6 redirect */
2420 if (!ip6_forwarding)
2421 goto fail;
2422
2423 /* sanity check */
2424 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2425 goto fail;
2426
2427 /*
2428 * Address check:
2429 * the source address must identify a neighbor, and
2430 * the destination address must not be a multicast address
2431 * [RFC 2461, sec 8.2]
2432 */
2433 sip6 = mtod(m0, struct ip6_hdr *);
2434 sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0);
2435 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2436 goto fail;
2437 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2438 goto fail; /* what should we do here? */
2439
2440 /* rate limit */
2441 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2442 goto fail;
2443
2444 /*
2445 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2446 * we almost always ask for an mbuf cluster for simplicity.
2447 * (MHLEN < IPV6_MMTU is almost always true)
2448 */
2449 MGETHDR(m, M_DONTWAIT, MT_HEADER);
2450 if (m && IPV6_MMTU >= MHLEN) {
2451#if IPV6_MMTU >= MCLBYTES
2452 _MCLGET(m, mcl_cache, IPV6_MMTU, M_DONTWAIT);
2453#else
2454 MCLGET(m, M_DONTWAIT);
2455#endif
2456 }
2457
2458 if (!m)
2459 goto fail;
2460 m_reset_rcvif(m);
2461 m->m_len = 0;
2462 maxlen = M_TRAILINGSPACE(m);
2463 maxlen = min(IPV6_MMTU, maxlen);
2464 /* just for safety */
2465 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2466 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2467 goto fail;
2468 }
2469
2470 {
2471 /* get ip6 linklocal address for ifp(my outgoing interface). */
2472 struct in6_ifaddr *ia;
2473 int s = pserialize_read_enter();
2474 if ((ia = in6ifa_ifpforlinklocal(ifp,
2475 IN6_IFF_NOTREADY|
2476 IN6_IFF_ANYCAST)) == NULL) {
2477 pserialize_read_exit(s);
2478 goto fail;
2479 }
2480 ifp_ll6 = &ia->ia_addr.sin6_addr;
2481 pserialize_read_exit(s);
2482 }
2483
2484 /* get ip6 linklocal address for the router. */
2485 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2486 struct sockaddr_in6 *sin6;
2487 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2488 nexthop = &sin6->sin6_addr;
2489 if (!IN6_IS_ADDR_LINKLOCAL(nexthop))
2490 nexthop = NULL;
2491 } else
2492 nexthop = NULL;
2493
2494 /* ip6 */
2495 ip6 = mtod(m, struct ip6_hdr *);
2496 ip6->ip6_flow = 0;
2497 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2498 ip6->ip6_vfc |= IPV6_VERSION;
2499 /* ip6->ip6_plen will be set later */
2500 ip6->ip6_nxt = IPPROTO_ICMPV6;
2501 ip6->ip6_hlim = 255;
2502 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2503 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2504 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2505
2506 /* ND Redirect */
2507 nd_rd = (struct nd_redirect *)(ip6 + 1);
2508 nd_rd->nd_rd_type = ND_REDIRECT;
2509 nd_rd->nd_rd_code = 0;
2510 nd_rd->nd_rd_reserved = 0;
2511 if (rt->rt_flags & RTF_GATEWAY) {
2512 /*
2513 * nd_rd->nd_rd_target must be a link-local address in
2514 * better router cases.
2515 */
2516 if (!nexthop)
2517 goto fail;
2518 bcopy(nexthop, &nd_rd->nd_rd_target,
2519 sizeof(nd_rd->nd_rd_target));
2520 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2521 sizeof(nd_rd->nd_rd_dst));
2522 } else {
2523 /* make sure redtgt == reddst */
2524 nexthop = &sip6->ip6_dst;
2525 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2526 sizeof(nd_rd->nd_rd_target));
2527 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2528 sizeof(nd_rd->nd_rd_dst));
2529 }
2530
2531 p = (u_char *)(nd_rd + 1);
2532
2533 {
2534 /* target lladdr option */
2535 struct llentry *ln = NULL;
2536 int len;
2537 struct nd_opt_hdr *nd_opt;
2538 char *lladdr;
2539
2540 ln = nd6_lookup(nexthop, ifp, false);
2541 if (ln == NULL)
2542 goto nolladdropt;
2543 len = sizeof(*nd_opt) + ifp->if_addrlen;
2544 len = (len + 7) & ~7; /* round by 8 */
2545 /* safety check */
2546 if (len + (p - (u_char *)ip6) > maxlen) {
2547 LLE_RUNLOCK(ln);
2548 goto nolladdropt;
2549 }
2550 if (ln->la_flags & LLE_VALID) {
2551 nd_opt = (struct nd_opt_hdr *)p;
2552 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2553 nd_opt->nd_opt_len = len >> 3;
2554 lladdr = (char *)(nd_opt + 1);
2555 memcpy(lladdr, &ln->ll_addr, ifp->if_addrlen);
2556 p += len;
2557 }
2558 LLE_RUNLOCK(ln);
2559 }
2560 nolladdropt:;
2561
2562 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2563
2564 /* just to be safe */
2565 if (m0->m_flags & M_DECRYPTED)
2566 goto noredhdropt;
2567 if (p - (u_char *)ip6 > maxlen)
2568 goto noredhdropt;
2569
2570 {
2571 /* redirected header option */
2572 int len;
2573 struct nd_opt_rd_hdr *nd_opt_rh;
2574
2575 /*
2576 * compute the maximum size for icmp6 redirect header option.
2577 * XXX room for auth header?
2578 */
2579 len = maxlen - (p - (u_char *)ip6);
2580 len &= ~7;
2581
2582 /*
2583 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2584 * about padding/truncate rule for the original IP packet.
2585 * From the discussion on IPv6imp in Feb 1999,
2586 * the consensus was:
2587 * - "attach as much as possible" is the goal
2588 * - pad if not aligned (original size can be guessed by
2589 * original ip6 header)
2590 * Following code adds the padding if it is simple enough,
2591 * and truncates if not.
2592 */
2593 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2594 /* not enough room, truncate */
2595 m_adj(m0, (len - sizeof(*nd_opt_rh)) -
2596 m0->m_pkthdr.len);
2597 } else {
2598 /*
2599 * enough room, truncate if not aligned.
2600 * we don't pad here for simplicity.
2601 */
2602 size_t extra;
2603
2604 extra = m0->m_pkthdr.len % 8;
2605 if (extra) {
2606 /* truncate */
2607 m_adj(m0, -extra);
2608 }
2609 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2610 }
2611
2612 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2613 memset(nd_opt_rh, 0, sizeof(*nd_opt_rh));
2614 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2615 nd_opt_rh->nd_opt_rh_len = len >> 3;
2616 p += sizeof(*nd_opt_rh);
2617 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2618
2619 /* connect m0 to m */
2620 m->m_pkthdr.len += m0->m_pkthdr.len;
2621 m_cat(m, m0);
2622 m0 = NULL;
2623 }
2624noredhdropt:
2625 if (m0) {
2626 m_freem(m0);
2627 m0 = NULL;
2628 }
2629
2630 /* XXX: clear embedded link IDs in the inner header */
2631 in6_clearscope(&sip6->ip6_src);
2632 in6_clearscope(&sip6->ip6_dst);
2633 in6_clearscope(&nd_rd->nd_rd_target);
2634 in6_clearscope(&nd_rd->nd_rd_dst);
2635
2636 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2637
2638 nd_rd->nd_rd_cksum = 0;
2639 nd_rd->nd_rd_cksum
2640 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2641
2642 /* send the packet to outside... */
2643 if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0)
2644 icmp6_ifstat_inc(ifp, ifs6_out_error);
2645
2646 icmp6_ifstat_inc(ifp, ifs6_out_msg);
2647 icmp6_ifstat_inc(ifp, ifs6_out_redirect);
2648 ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT);
2649
2650 return;
2651
2652fail:
2653 if (m)
2654 m_freem(m);
2655 if (m0)
2656 m_freem(m0);
2657}
2658
2659/*
2660 * ICMPv6 socket option processing.
2661 */
2662int
2663icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt)
2664{
2665 int error = 0;
2666 struct in6pcb *in6p = sotoin6pcb(so);
2667
2668 if (sopt->sopt_level != IPPROTO_ICMPV6)
2669 return rip6_ctloutput(op, so, sopt);
2670
2671 switch (op) {
2672 case PRCO_SETOPT:
2673 switch (sopt->sopt_name) {
2674 case ICMP6_FILTER:
2675 {
2676 struct icmp6_filter fil;
2677
2678 error = sockopt_get(sopt, &fil, sizeof(fil));
2679 if (error)
2680 break;
2681 memcpy(in6p->in6p_icmp6filt, &fil,
2682 sizeof(struct icmp6_filter));
2683 error = 0;
2684 break;
2685 }
2686
2687 default:
2688 error = ENOPROTOOPT;
2689 break;
2690 }
2691 break;
2692
2693 case PRCO_GETOPT:
2694 switch (sopt->sopt_name) {
2695 case ICMP6_FILTER:
2696 {
2697 if (in6p->in6p_icmp6filt == NULL) {
2698 error = EINVAL;
2699 break;
2700 }
2701 error = sockopt_set(sopt, in6p->in6p_icmp6filt,
2702 sizeof(struct icmp6_filter));
2703 break;
2704 }
2705
2706 default:
2707 error = ENOPROTOOPT;
2708 break;
2709 }
2710 break;
2711 }
2712
2713 return (error);
2714}
2715
2716/*
2717 * Perform rate limit check.
2718 * Returns 0 if it is okay to send the icmp6 packet.
2719 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2720 * limitation.
2721 *
2722 * XXX per-destination/type check necessary?
2723 */
2724static int
2725icmp6_ratelimit(
2726 const struct in6_addr *dst, /* not used at this moment */
2727 const int type, /* not used at this moment */
2728 const int code) /* not used at this moment */
2729{
2730 int ret;
2731
2732 ret = 0; /* okay to send */
2733
2734 /* PPS limit */
2735 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2736 icmp6errppslim)) {
2737 /* The packet is subject to rate limit */
2738 ret++;
2739 }
2740
2741 return ret;
2742}
2743
2744static struct rtentry *
2745icmp6_mtudisc_clone(struct sockaddr *dst)
2746{
2747 struct rtentry *rt;
2748 int error;
2749
2750 rt = rtalloc1(dst, 1);
2751 if (rt == 0)
2752 return NULL;
2753
2754 /* If we didn't get a host route, allocate one */
2755 if ((rt->rt_flags & RTF_HOST) == 0) {
2756 struct rtentry *nrt;
2757
2758 error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL,
2759 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt);
2760 if (error) {
2761 rtfree(rt);
2762 return NULL;
2763 }
2764 nrt->rt_rmx = rt->rt_rmx;
2765 rtfree(rt);
2766 rt = nrt;
2767 }
2768 error = rt_timer_add(rt, icmp6_mtudisc_timeout,
2769 icmp6_mtudisc_timeout_q);
2770 if (error) {
2771 rtfree(rt);
2772 return NULL;
2773 }
2774
2775 return rt; /* caller need to call rtfree() */
2776}
2777
2778static void
2779icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r)
2780{
2781
2782 KASSERT(rt != NULL);
2783 rt_assert_referenced(rt);
2784
2785 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) ==
2786 (RTF_DYNAMIC | RTF_HOST)) {
2787 rtrequest(RTM_DELETE, rt_getkey(rt),
2788 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL);
2789 } else {
2790 if (!(rt->rt_rmx.rmx_locks & RTV_MTU))
2791 rt->rt_rmx.rmx_mtu = 0;
2792 }
2793}
2794
2795static void
2796icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r)
2797{
2798
2799 KASSERT(rt != NULL);
2800 rt_assert_referenced(rt);
2801
2802 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) ==
2803 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) {
2804 rtrequest(RTM_DELETE, rt_getkey(rt),
2805 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL);
2806 }
2807}
2808
2809/*
2810 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly?
2811 */
2812static int
2813sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS)
2814{
2815 (void)&name;
2816 (void)&l;
2817 (void)&oname;
2818
2819 if (namelen != 0)
2820 return (EINVAL);
2821
2822 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp,
2823 /*XXXUNCONST*/
2824 __UNCONST(newp), newlen));
2825}
2826
2827static int
2828sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS)
2829{
2830
2831 return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS));
2832}
2833
2834static int
2835sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS)
2836{
2837 int error, tmp;
2838 struct sysctlnode node;
2839
2840 node = *rnode;
2841 node.sysctl_data = &tmp;
2842 tmp = icmp6_redirtimeout;
2843 error = sysctl_lookup(SYSCTLFN_CALL(&node));
2844 if (error || newp == NULL)
2845 return error;
2846 if (tmp < 0)
2847 return EINVAL;
2848 icmp6_redirtimeout = tmp;
2849
2850 if (icmp6_redirect_timeout_q != NULL) {
2851 if (icmp6_redirtimeout == 0) {
2852 rt_timer_queue_destroy(icmp6_redirect_timeout_q);
2853 } else {
2854 rt_timer_queue_change(icmp6_redirect_timeout_q,
2855 icmp6_redirtimeout);
2856 }
2857 } else if (icmp6_redirtimeout > 0) {
2858 icmp6_redirect_timeout_q =
2859 rt_timer_queue_create(icmp6_redirtimeout);
2860 }
2861
2862 return 0;
2863}
2864
2865static void
2866sysctl_net_inet6_icmp6_setup(struct sysctllog **clog)
2867{
2868 extern int nd6_maxqueuelen; /* defined in nd6.c */
2869
2870 sysctl_createv(clog, 0, NULL, NULL,
2871 CTLFLAG_PERMANENT,
2872 CTLTYPE_NODE, "inet6", NULL,
2873 NULL, 0, NULL, 0,
2874 CTL_NET, PF_INET6, CTL_EOL);
2875 sysctl_createv(clog, 0, NULL, NULL,
2876 CTLFLAG_PERMANENT,
2877 CTLTYPE_NODE, "icmp6",
2878 SYSCTL_DESCR("ICMPv6 related settings"),
2879 NULL, 0, NULL, 0,
2880 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL);
2881
2882 sysctl_createv(clog, 0, NULL, NULL,
2883 CTLFLAG_PERMANENT,
2884 CTLTYPE_STRUCT, "stats",
2885 SYSCTL_DESCR("ICMPv6 transmission statistics"),
2886 sysctl_net_inet6_icmp6_stats, 0, NULL, 0,
2887 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2888 ICMPV6CTL_STATS, CTL_EOL);
2889 sysctl_createv(clog, 0, NULL, NULL,
2890 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2891 CTLTYPE_INT, "rediraccept",
2892 SYSCTL_DESCR("Accept and process redirect messages"),
2893 NULL, 0, &icmp6_rediraccept, 0,
2894 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2895 ICMPV6CTL_REDIRACCEPT, CTL_EOL);
2896 sysctl_createv(clog, 0, NULL, NULL,
2897 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2898 CTLTYPE_INT, "redirtimeout",
2899 SYSCTL_DESCR("Redirect generated route lifetime"),
2900 sysctl_net_inet6_icmp6_redirtimeout, 0,
2901 &icmp6_redirtimeout, 0,
2902 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2903 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL);
2904#if 0 /* obsoleted */
2905 sysctl_createv(clog, 0, NULL, NULL,
2906 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2907 CTLTYPE_INT, "errratelimit", NULL,
2908 NULL, 0, &icmp6_errratelimit, 0,
2909 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2910 ICMPV6CTL_ERRRATELIMIT, CTL_EOL);
2911#endif
2912 sysctl_createv(clog, 0, NULL, NULL,
2913 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2914 CTLTYPE_INT, "nd6_prune",
2915 SYSCTL_DESCR("Neighbor discovery prune interval"),
2916 NULL, 0, &nd6_prune, 0,
2917 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2918 ICMPV6CTL_ND6_PRUNE, CTL_EOL);
2919 sysctl_createv(clog, 0, NULL, NULL,
2920 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2921 CTLTYPE_INT, "nd6_delay",
2922 SYSCTL_DESCR("First probe delay time"),
2923 NULL, 0, &nd6_delay, 0,
2924 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2925 ICMPV6CTL_ND6_DELAY, CTL_EOL);
2926 sysctl_createv(clog, 0, NULL, NULL,
2927 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2928 CTLTYPE_INT, "nd6_umaxtries",
2929 SYSCTL_DESCR("Number of unicast discovery attempts"),
2930 NULL, 0, &nd6_umaxtries, 0,
2931 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2932 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL);
2933 sysctl_createv(clog, 0, NULL, NULL,
2934 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2935 CTLTYPE_INT, "nd6_mmaxtries",
2936 SYSCTL_DESCR("Number of multicast discovery attempts"),
2937 NULL, 0, &nd6_mmaxtries, 0,
2938 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2939 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL);
2940 sysctl_createv(clog, 0, NULL, NULL,
2941 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2942 CTLTYPE_INT, "nd6_useloopback",
2943 SYSCTL_DESCR("Use loopback interface for local traffic"),
2944 NULL, 0, &nd6_useloopback, 0,
2945 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2946 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL);
2947#if 0 /* obsoleted */
2948 sysctl_createv(clog, 0, NULL, NULL,
2949 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2950 CTLTYPE_INT, "nd6_proxyall", NULL,
2951 NULL, 0, &nd6_proxyall, 0,
2952 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2953 ICMPV6CTL_ND6_PROXYALL, CTL_EOL);
2954#endif
2955 sysctl_createv(clog, 0, NULL, NULL,
2956 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2957 CTLTYPE_INT, "nodeinfo",
2958 SYSCTL_DESCR("Respond to node information requests"),
2959 NULL, 0, &icmp6_nodeinfo, 0,
2960 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2961 ICMPV6CTL_NODEINFO, CTL_EOL);
2962 sysctl_createv(clog, 0, NULL, NULL,
2963 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2964 CTLTYPE_INT, "errppslimit",
2965 SYSCTL_DESCR("Maximum ICMP errors sent per second"),
2966 NULL, 0, &icmp6errppslim, 0,
2967 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2968 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL);
2969 sysctl_createv(clog, 0, NULL, NULL,
2970 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2971 CTLTYPE_INT, "nd6_maxnudhint",
2972 SYSCTL_DESCR("Maximum neighbor unreachable hint count"),
2973 NULL, 0, &nd6_maxnudhint, 0,
2974 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2975 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL);
2976 sysctl_createv(clog, 0, NULL, NULL,
2977 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2978 CTLTYPE_INT, "mtudisc_hiwat",
2979 SYSCTL_DESCR("Low mark on MTU Discovery route timers"),
2980 NULL, 0, &icmp6_mtudisc_hiwat, 0,
2981 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2982 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL);
2983 sysctl_createv(clog, 0, NULL, NULL,
2984 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2985 CTLTYPE_INT, "mtudisc_lowat",
2986 SYSCTL_DESCR("Low mark on MTU Discovery route timers"),
2987 NULL, 0, &icmp6_mtudisc_lowat, 0,
2988 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2989 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL);
2990 sysctl_createv(clog, 0, NULL, NULL,
2991 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2992 CTLTYPE_INT, "nd6_debug",
2993 SYSCTL_DESCR("Enable neighbor discovery debug output"),
2994 NULL, 0, &nd6_debug, 0,
2995 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2996 ICMPV6CTL_ND6_DEBUG, CTL_EOL);
2997 sysctl_createv(clog, 0, NULL, NULL,
2998 CTLFLAG_PERMANENT,
2999 CTLTYPE_STRUCT, "nd6_drlist",
3000 SYSCTL_DESCR("Default router list"),
3001 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0,
3002 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3003 ICMPV6CTL_ND6_DRLIST, CTL_EOL);
3004 sysctl_createv(clog, 0, NULL, NULL,
3005 CTLFLAG_PERMANENT,
3006 CTLTYPE_STRUCT, "nd6_prlist",
3007 SYSCTL_DESCR("Prefix list"),
3008 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0,
3009 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3010 ICMPV6CTL_ND6_PRLIST, CTL_EOL);
3011 sysctl_createv(clog, 0, NULL, NULL,
3012 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3013 CTLTYPE_INT, "maxqueuelen",
3014 SYSCTL_DESCR("max packet queue len for a unresolved ND"),
3015 NULL, 1, &nd6_maxqueuelen, 0,
3016 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3017 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL);
3018}
3019
3020void
3021icmp6_statinc(u_int stat)
3022{
3023
3024 KASSERT(stat < ICMP6_NSTATS);
3025 ICMP6_STATINC(stat);
3026}
3027