1/* $FreeBSD: head/sys/netinet6/icmp6.c 166619 2007-02-10 12:25:19Z bms $ */
| 1/* $FreeBSD: head/sys/netinet6/icmp6.c 169664 2007-05-17 21:20:24Z jinmei $ */
|
2/* $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun 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 * 4. 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 "opt_inet.h"
65#include "opt_inet6.h"
66#include "opt_ipsec.h"
67
68#include <sys/param.h>
69#include <sys/domain.h>
70#include <sys/kernel.h>
71#include <sys/lock.h>
72#include <sys/malloc.h>
73#include <sys/mbuf.h>
74#include <sys/protosw.h>
75#include <sys/signalvar.h>
76#include <sys/socket.h>
77#include <sys/socketvar.h>
78#include <sys/sx.h>
79#include <sys/syslog.h>
80#include <sys/systm.h>
81#include <sys/time.h>
82
83#include <net/if.h>
84#include <net/if_dl.h>
85#include <net/if_types.h>
86#include <net/route.h>
87
88#include <netinet/in.h>
89#include <netinet/in_pcb.h>
90#include <netinet/in_var.h>
91#include <netinet/ip6.h>
92#include <netinet/icmp6.h>
93#include <netinet/tcp_var.h>
94#include <netinet6/in6_ifattach.h>
95#include <netinet6/in6_pcb.h>
96#include <netinet6/ip6protosw.h>
97#include <netinet6/ip6_var.h>
98#include <netinet6/scope6_var.h>
99#include <netinet6/mld6_var.h>
100#include <netinet6/nd6.h>
101
102#ifdef IPSEC
103#include <netinet6/ipsec.h>
104#include <netkey/key.h>
105#endif
106
107#ifdef FAST_IPSEC
108#include <netipsec/ipsec.h>
109#include <netipsec/key.h>
110#endif
111
112extern struct domain inet6domain;
113
114struct icmp6stat icmp6stat;
115
116extern struct inpcbinfo ripcbinfo;
117extern struct inpcbhead ripcb;
118extern int icmp6errppslim;
119static int icmp6errpps_count = 0;
120static struct timeval icmp6errppslim_last;
121extern int icmp6_nodeinfo;
122
123static void icmp6_errcount __P((struct icmp6errstat *, int, int));
124static int icmp6_rip6_input __P((struct mbuf **, int));
125static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int));
126static const char *icmp6_redirect_diag __P((struct in6_addr *,
127 struct in6_addr *, struct in6_addr *));
128static struct mbuf *ni6_input __P((struct mbuf *, int));
129static struct mbuf *ni6_nametodns __P((const char *, int, int));
130static int ni6_dnsmatch __P((const char *, int, const char *, int));
131static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *,
132 struct ifnet **, struct in6_addr *));
133static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
134 struct ifnet *, int));
135static int icmp6_notify_error __P((struct mbuf **, int, int, int));
136
137
138void
139icmp6_init()
140{
141 mld6_init();
142}
143
144static void
145icmp6_errcount(stat, type, code)
146 struct icmp6errstat *stat;
147 int type, code;
148{
149 switch (type) {
150 case ICMP6_DST_UNREACH:
151 switch (code) {
152 case ICMP6_DST_UNREACH_NOROUTE:
153 stat->icp6errs_dst_unreach_noroute++;
154 return;
155 case ICMP6_DST_UNREACH_ADMIN:
156 stat->icp6errs_dst_unreach_admin++;
157 return;
158 case ICMP6_DST_UNREACH_BEYONDSCOPE:
159 stat->icp6errs_dst_unreach_beyondscope++;
160 return;
161 case ICMP6_DST_UNREACH_ADDR:
162 stat->icp6errs_dst_unreach_addr++;
163 return;
164 case ICMP6_DST_UNREACH_NOPORT:
165 stat->icp6errs_dst_unreach_noport++;
166 return;
167 }
168 break;
169 case ICMP6_PACKET_TOO_BIG:
170 stat->icp6errs_packet_too_big++;
171 return;
172 case ICMP6_TIME_EXCEEDED:
173 switch (code) {
174 case ICMP6_TIME_EXCEED_TRANSIT:
175 stat->icp6errs_time_exceed_transit++;
176 return;
177 case ICMP6_TIME_EXCEED_REASSEMBLY:
178 stat->icp6errs_time_exceed_reassembly++;
179 return;
180 }
181 break;
182 case ICMP6_PARAM_PROB:
183 switch (code) {
184 case ICMP6_PARAMPROB_HEADER:
185 stat->icp6errs_paramprob_header++;
186 return;
187 case ICMP6_PARAMPROB_NEXTHEADER:
188 stat->icp6errs_paramprob_nextheader++;
189 return;
190 case ICMP6_PARAMPROB_OPTION:
191 stat->icp6errs_paramprob_option++;
192 return;
193 }
194 break;
195 case ND_REDIRECT:
196 stat->icp6errs_redirect++;
197 return;
198 }
199 stat->icp6errs_unknown++;
200}
201
202/*
203 * A wrapper function for icmp6_error() necessary when the erroneous packet
204 * may not contain enough scope zone information.
205 */
206void
207icmp6_error2(m, type, code, param, ifp)
208 struct mbuf *m;
209 int type, code, param;
210 struct ifnet *ifp;
211{
212 struct ip6_hdr *ip6;
213
214 if (ifp == NULL)
215 return;
216
217#ifndef PULLDOWN_TEST
218 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
219#else
220 if (m->m_len < sizeof(struct ip6_hdr)) {
221 m = m_pullup(m, sizeof(struct ip6_hdr));
222 if (m == NULL)
223 return;
224 }
225#endif
226
227 ip6 = mtod(m, struct ip6_hdr *);
228
229 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
230 return;
231 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
232 return;
233
234 icmp6_error(m, type, code, param);
235}
236
237/*
238 * Generate an error packet of type error in response to bad IP6 packet.
239 */
240void
241icmp6_error(m, type, code, param)
242 struct mbuf *m;
243 int type, code, param;
244{
245 struct ip6_hdr *oip6, *nip6;
246 struct icmp6_hdr *icmp6;
247 u_int preplen;
248 int off;
249 int nxt;
250
251 icmp6stat.icp6s_error++;
252
253 /* count per-type-code statistics */
254 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
255
256#ifdef M_DECRYPTED /*not openbsd*/
257 if (m->m_flags & M_DECRYPTED) {
258 icmp6stat.icp6s_canterror++;
259 goto freeit;
260 }
261#endif
262
263#ifndef PULLDOWN_TEST
264 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
265#else
266 if (m->m_len < sizeof(struct ip6_hdr)) {
267 m = m_pullup(m, sizeof(struct ip6_hdr));
268 if (m == NULL)
269 return;
270 }
271#endif
272 oip6 = mtod(m, struct ip6_hdr *);
273
274 /*
275 * If the destination address of the erroneous packet is a multicast
276 * address, or the packet was sent using link-layer multicast,
277 * we should basically suppress sending an error (RFC 2463, Section
278 * 2.4).
279 * We have two exceptions (the item e.2 in that section):
280 * - the Pakcet Too Big message can be sent for path MTU discovery.
281 * - the Parameter Problem Message that can be allowed an icmp6 error
282 * in the option type field. This check has been done in
283 * ip6_unknown_opt(), so we can just check the type and code.
284 */
285 if ((m->m_flags & (M_BCAST|M_MCAST) ||
286 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
287 (type != ICMP6_PACKET_TOO_BIG &&
288 (type != ICMP6_PARAM_PROB ||
289 code != ICMP6_PARAMPROB_OPTION)))
290 goto freeit;
291
292 /*
293 * RFC 2463, 2.4 (e.5): source address check.
294 * XXX: the case of anycast source?
295 */
296 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
297 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
298 goto freeit;
299
300 /*
301 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
302 * don't do it.
303 */
304 nxt = -1;
305 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
306 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
307 struct icmp6_hdr *icp;
308
309#ifndef PULLDOWN_TEST
310 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
311 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
312#else
313 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
314 sizeof(*icp));
315 if (icp == NULL) {
316 icmp6stat.icp6s_tooshort++;
317 return;
318 }
319#endif
320 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
321 icp->icmp6_type == ND_REDIRECT) {
322 /*
323 * ICMPv6 error
324 * Special case: for redirect (which is
325 * informational) we must not send icmp6 error.
326 */
327 icmp6stat.icp6s_canterror++;
328 goto freeit;
329 } else {
330 /* ICMPv6 informational - send the error */
331 }
332 } else {
333 /* non-ICMPv6 - send the error */
334 }
335
336 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
337
338 /* Finally, do rate limitation check. */
339 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
340 icmp6stat.icp6s_toofreq++;
341 goto freeit;
342 }
343
344 /*
345 * OK, ICMP6 can be generated.
346 */
347
348 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
349 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
350
351 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
352 M_PREPEND(m, preplen, M_DONTWAIT);
353 if (m && m->m_len < preplen)
354 m = m_pullup(m, preplen);
355 if (m == NULL) {
356 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
357 return;
358 }
359
360 nip6 = mtod(m, struct ip6_hdr *);
361 nip6->ip6_src = oip6->ip6_src;
362 nip6->ip6_dst = oip6->ip6_dst;
363
364 in6_clearscope(&oip6->ip6_src);
365 in6_clearscope(&oip6->ip6_dst);
366
367 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
368 icmp6->icmp6_type = type;
369 icmp6->icmp6_code = code;
370 icmp6->icmp6_pptr = htonl((u_int32_t)param);
371
372 /*
373 * icmp6_reflect() is designed to be in the input path.
374 * icmp6_error() can be called from both input and output path,
375 * and if we are in output path rcvif could contain bogus value.
376 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
377 * information in ip header (nip6).
378 */
379 m->m_pkthdr.rcvif = NULL;
380
381 icmp6stat.icp6s_outhist[type]++;
382 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
383
384 return;
385
386 freeit:
387 /*
388 * If we can't tell whether or not we can generate ICMP6, free it.
389 */
390 m_freem(m);
391}
392
393/*
394 * Process a received ICMP6 message.
395 */
396int
397icmp6_input(mp, offp, proto)
398 struct mbuf **mp;
399 int *offp, proto;
400{
401 struct mbuf *m = *mp, *n;
402 struct ip6_hdr *ip6, *nip6;
403 struct icmp6_hdr *icmp6, *nicmp6;
404 int off = *offp;
405 int icmp6len = m->m_pkthdr.len - *offp;
406 int code, sum, noff;
407 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
408
409#ifndef PULLDOWN_TEST
410 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
411 /* m might change if M_LOOP. So, call mtod after this */
412#endif
413
414 /*
415 * Locate icmp6 structure in mbuf, and check
416 * that not corrupted and of at least minimum length
417 */
418
419 ip6 = mtod(m, struct ip6_hdr *);
420 if (icmp6len < sizeof(struct icmp6_hdr)) {
421 icmp6stat.icp6s_tooshort++;
422 goto freeit;
423 }
424
425 /*
426 * calculate the checksum
427 */
428#ifndef PULLDOWN_TEST
429 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
430#else
431 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
432 if (icmp6 == NULL) {
433 icmp6stat.icp6s_tooshort++;
434 return IPPROTO_DONE;
435 }
436#endif
437 code = icmp6->icmp6_code;
438
439 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
440 nd6log((LOG_ERR,
441 "ICMP6 checksum error(%d|%x) %s\n",
442 icmp6->icmp6_type, sum,
443 ip6_sprintf(ip6bufs, &ip6->ip6_src)));
444 icmp6stat.icp6s_checksum++;
445 goto freeit;
446 }
447
448 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
449 /*
450 * Deliver very specific ICMP6 type only.
451 * This is important to deliver TOOBIG. Otherwise PMTUD
452 * will not work.
453 */
454 switch (icmp6->icmp6_type) {
455 case ICMP6_DST_UNREACH:
456 case ICMP6_PACKET_TOO_BIG:
457 case ICMP6_TIME_EXCEEDED:
458 break;
459 default:
460 goto freeit;
461 }
462 }
463
464 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
465 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
466 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
467 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
468
469 switch (icmp6->icmp6_type) {
470 case ICMP6_DST_UNREACH:
471 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
472 switch (code) {
473 case ICMP6_DST_UNREACH_NOROUTE:
474 code = PRC_UNREACH_NET;
475 break;
476 case ICMP6_DST_UNREACH_ADMIN:
477 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
478 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
479 break;
480 case ICMP6_DST_UNREACH_ADDR:
481 code = PRC_HOSTDEAD;
482 break;
483 case ICMP6_DST_UNREACH_BEYONDSCOPE:
484 /* I mean "source address was incorrect." */
485 code = PRC_PARAMPROB;
486 break;
487 case ICMP6_DST_UNREACH_NOPORT:
488 code = PRC_UNREACH_PORT;
489 break;
490 default:
491 goto badcode;
492 }
493 goto deliver;
494 break;
495
496 case ICMP6_PACKET_TOO_BIG:
497 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
498
499 /* validation is made in icmp6_mtudisc_update */
500
501 code = PRC_MSGSIZE;
502
503 /*
504 * Updating the path MTU will be done after examining
505 * intermediate extension headers.
506 */
507 goto deliver;
508 break;
509
510 case ICMP6_TIME_EXCEEDED:
511 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
512 switch (code) {
513 case ICMP6_TIME_EXCEED_TRANSIT:
514 code = PRC_TIMXCEED_INTRANS;
515 break;
516 case ICMP6_TIME_EXCEED_REASSEMBLY:
517 code = PRC_TIMXCEED_REASS;
518 break;
519 default:
520 goto badcode;
521 }
522 goto deliver;
523 break;
524
525 case ICMP6_PARAM_PROB:
526 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
527 switch (code) {
528 case ICMP6_PARAMPROB_NEXTHEADER:
529 code = PRC_UNREACH_PROTOCOL;
530 break;
531 case ICMP6_PARAMPROB_HEADER:
532 case ICMP6_PARAMPROB_OPTION:
533 code = PRC_PARAMPROB;
534 break;
535 default:
536 goto badcode;
537 }
538 goto deliver;
539 break;
540
541 case ICMP6_ECHO_REQUEST:
542 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
543 if (code != 0)
544 goto badcode;
545 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
546 /* Give up remote */
547 break;
548 }
549 if ((n->m_flags & M_EXT) != 0
550 || n->m_len < off + sizeof(struct icmp6_hdr)) {
551 struct mbuf *n0 = n;
552 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
553 int n0len;
554
555 MGETHDR(n, M_DONTWAIT, n0->m_type);
556 n0len = n0->m_pkthdr.len; /* save for use below */
557 if (n)
558 M_MOVE_PKTHDR(n, n0);
559 if (n && maxlen >= MHLEN) {
560 MCLGET(n, M_DONTWAIT);
561 if ((n->m_flags & M_EXT) == 0) {
562 m_free(n);
563 n = NULL;
564 }
565 }
566 if (n == NULL) {
567 /* Give up remote */
568 m_freem(n0);
569 break;
570 }
571 /*
572 * Copy IPv6 and ICMPv6 only.
573 */
574 nip6 = mtod(n, struct ip6_hdr *);
575 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
576 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
577 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
578 noff = sizeof(struct ip6_hdr);
579 /* new mbuf contains only ipv6+icmpv6 headers */
580 n->m_len = noff + sizeof(struct icmp6_hdr);
581 /*
582 * Adjust mbuf. ip6_plen will be adjusted in
583 * ip6_output().
584 */
585 m_adj(n0, off + sizeof(struct icmp6_hdr));
586 /* recalculate complete packet size */
587 n->m_pkthdr.len = n0len + (noff - off);
588 n->m_next = n0;
589 } else {
590 nip6 = mtod(n, struct ip6_hdr *);
591 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
592 sizeof(*nicmp6));
593 noff = off;
594 }
595 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
596 nicmp6->icmp6_code = 0;
597 if (n) {
598 icmp6stat.icp6s_reflect++;
599 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
600 icmp6_reflect(n, noff);
601 }
602 break;
603
604 case ICMP6_ECHO_REPLY:
605 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
606 if (code != 0)
607 goto badcode;
608 break;
609
610 case MLD_LISTENER_QUERY:
611 case MLD_LISTENER_REPORT:
612 if (icmp6len < sizeof(struct mld_hdr))
613 goto badlen;
614 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
615 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
616 else
617 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
618 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
619 /* give up local */
620 mld6_input(m, off);
621 m = NULL;
622 goto freeit;
623 }
624 mld6_input(n, off);
625 /* m stays. */
626 break;
627
628 case MLD_LISTENER_DONE:
629 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
630 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
631 goto badlen;
632 break; /* nothing to be done in kernel */
633
634 case MLD_MTRACE_RESP:
635 case MLD_MTRACE:
636 /* XXX: these two are experimental. not officially defined. */
637 /* XXX: per-interface statistics? */
638 break; /* just pass it to applications */
639
640 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
641 {
642 enum { WRU, FQDN } mode;
643
644 if (!icmp6_nodeinfo)
645 break;
646
647 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
648 mode = WRU;
649 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
650 mode = FQDN;
651 else
652 goto badlen;
653
654#define hostnamelen strlen(hostname)
655 if (mode == FQDN) {
656#ifndef PULLDOWN_TEST
657 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
658 IPPROTO_DONE);
659#endif
660 n = m_copy(m, 0, M_COPYALL);
661 if (n)
662 n = ni6_input(n, off);
663 /* XXX meaningless if n == NULL */
664 noff = sizeof(struct ip6_hdr);
665 } else {
666 u_char *p;
667 int maxlen, maxhlen;
668
| 2/* $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun 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 * 4. 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 "opt_inet.h"
65#include "opt_inet6.h"
66#include "opt_ipsec.h"
67
68#include <sys/param.h>
69#include <sys/domain.h>
70#include <sys/kernel.h>
71#include <sys/lock.h>
72#include <sys/malloc.h>
73#include <sys/mbuf.h>
74#include <sys/protosw.h>
75#include <sys/signalvar.h>
76#include <sys/socket.h>
77#include <sys/socketvar.h>
78#include <sys/sx.h>
79#include <sys/syslog.h>
80#include <sys/systm.h>
81#include <sys/time.h>
82
83#include <net/if.h>
84#include <net/if_dl.h>
85#include <net/if_types.h>
86#include <net/route.h>
87
88#include <netinet/in.h>
89#include <netinet/in_pcb.h>
90#include <netinet/in_var.h>
91#include <netinet/ip6.h>
92#include <netinet/icmp6.h>
93#include <netinet/tcp_var.h>
94#include <netinet6/in6_ifattach.h>
95#include <netinet6/in6_pcb.h>
96#include <netinet6/ip6protosw.h>
97#include <netinet6/ip6_var.h>
98#include <netinet6/scope6_var.h>
99#include <netinet6/mld6_var.h>
100#include <netinet6/nd6.h>
101
102#ifdef IPSEC
103#include <netinet6/ipsec.h>
104#include <netkey/key.h>
105#endif
106
107#ifdef FAST_IPSEC
108#include <netipsec/ipsec.h>
109#include <netipsec/key.h>
110#endif
111
112extern struct domain inet6domain;
113
114struct icmp6stat icmp6stat;
115
116extern struct inpcbinfo ripcbinfo;
117extern struct inpcbhead ripcb;
118extern int icmp6errppslim;
119static int icmp6errpps_count = 0;
120static struct timeval icmp6errppslim_last;
121extern int icmp6_nodeinfo;
122
123static void icmp6_errcount __P((struct icmp6errstat *, int, int));
124static int icmp6_rip6_input __P((struct mbuf **, int));
125static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int));
126static const char *icmp6_redirect_diag __P((struct in6_addr *,
127 struct in6_addr *, struct in6_addr *));
128static struct mbuf *ni6_input __P((struct mbuf *, int));
129static struct mbuf *ni6_nametodns __P((const char *, int, int));
130static int ni6_dnsmatch __P((const char *, int, const char *, int));
131static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *,
132 struct ifnet **, struct in6_addr *));
133static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
134 struct ifnet *, int));
135static int icmp6_notify_error __P((struct mbuf **, int, int, int));
136
137
138void
139icmp6_init()
140{
141 mld6_init();
142}
143
144static void
145icmp6_errcount(stat, type, code)
146 struct icmp6errstat *stat;
147 int type, code;
148{
149 switch (type) {
150 case ICMP6_DST_UNREACH:
151 switch (code) {
152 case ICMP6_DST_UNREACH_NOROUTE:
153 stat->icp6errs_dst_unreach_noroute++;
154 return;
155 case ICMP6_DST_UNREACH_ADMIN:
156 stat->icp6errs_dst_unreach_admin++;
157 return;
158 case ICMP6_DST_UNREACH_BEYONDSCOPE:
159 stat->icp6errs_dst_unreach_beyondscope++;
160 return;
161 case ICMP6_DST_UNREACH_ADDR:
162 stat->icp6errs_dst_unreach_addr++;
163 return;
164 case ICMP6_DST_UNREACH_NOPORT:
165 stat->icp6errs_dst_unreach_noport++;
166 return;
167 }
168 break;
169 case ICMP6_PACKET_TOO_BIG:
170 stat->icp6errs_packet_too_big++;
171 return;
172 case ICMP6_TIME_EXCEEDED:
173 switch (code) {
174 case ICMP6_TIME_EXCEED_TRANSIT:
175 stat->icp6errs_time_exceed_transit++;
176 return;
177 case ICMP6_TIME_EXCEED_REASSEMBLY:
178 stat->icp6errs_time_exceed_reassembly++;
179 return;
180 }
181 break;
182 case ICMP6_PARAM_PROB:
183 switch (code) {
184 case ICMP6_PARAMPROB_HEADER:
185 stat->icp6errs_paramprob_header++;
186 return;
187 case ICMP6_PARAMPROB_NEXTHEADER:
188 stat->icp6errs_paramprob_nextheader++;
189 return;
190 case ICMP6_PARAMPROB_OPTION:
191 stat->icp6errs_paramprob_option++;
192 return;
193 }
194 break;
195 case ND_REDIRECT:
196 stat->icp6errs_redirect++;
197 return;
198 }
199 stat->icp6errs_unknown++;
200}
201
202/*
203 * A wrapper function for icmp6_error() necessary when the erroneous packet
204 * may not contain enough scope zone information.
205 */
206void
207icmp6_error2(m, type, code, param, ifp)
208 struct mbuf *m;
209 int type, code, param;
210 struct ifnet *ifp;
211{
212 struct ip6_hdr *ip6;
213
214 if (ifp == NULL)
215 return;
216
217#ifndef PULLDOWN_TEST
218 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
219#else
220 if (m->m_len < sizeof(struct ip6_hdr)) {
221 m = m_pullup(m, sizeof(struct ip6_hdr));
222 if (m == NULL)
223 return;
224 }
225#endif
226
227 ip6 = mtod(m, struct ip6_hdr *);
228
229 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
230 return;
231 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
232 return;
233
234 icmp6_error(m, type, code, param);
235}
236
237/*
238 * Generate an error packet of type error in response to bad IP6 packet.
239 */
240void
241icmp6_error(m, type, code, param)
242 struct mbuf *m;
243 int type, code, param;
244{
245 struct ip6_hdr *oip6, *nip6;
246 struct icmp6_hdr *icmp6;
247 u_int preplen;
248 int off;
249 int nxt;
250
251 icmp6stat.icp6s_error++;
252
253 /* count per-type-code statistics */
254 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
255
256#ifdef M_DECRYPTED /*not openbsd*/
257 if (m->m_flags & M_DECRYPTED) {
258 icmp6stat.icp6s_canterror++;
259 goto freeit;
260 }
261#endif
262
263#ifndef PULLDOWN_TEST
264 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
265#else
266 if (m->m_len < sizeof(struct ip6_hdr)) {
267 m = m_pullup(m, sizeof(struct ip6_hdr));
268 if (m == NULL)
269 return;
270 }
271#endif
272 oip6 = mtod(m, struct ip6_hdr *);
273
274 /*
275 * If the destination address of the erroneous packet is a multicast
276 * address, or the packet was sent using link-layer multicast,
277 * we should basically suppress sending an error (RFC 2463, Section
278 * 2.4).
279 * We have two exceptions (the item e.2 in that section):
280 * - the Pakcet Too Big message can be sent for path MTU discovery.
281 * - the Parameter Problem Message that can be allowed an icmp6 error
282 * in the option type field. This check has been done in
283 * ip6_unknown_opt(), so we can just check the type and code.
284 */
285 if ((m->m_flags & (M_BCAST|M_MCAST) ||
286 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
287 (type != ICMP6_PACKET_TOO_BIG &&
288 (type != ICMP6_PARAM_PROB ||
289 code != ICMP6_PARAMPROB_OPTION)))
290 goto freeit;
291
292 /*
293 * RFC 2463, 2.4 (e.5): source address check.
294 * XXX: the case of anycast source?
295 */
296 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
297 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
298 goto freeit;
299
300 /*
301 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
302 * don't do it.
303 */
304 nxt = -1;
305 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
306 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
307 struct icmp6_hdr *icp;
308
309#ifndef PULLDOWN_TEST
310 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
311 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
312#else
313 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
314 sizeof(*icp));
315 if (icp == NULL) {
316 icmp6stat.icp6s_tooshort++;
317 return;
318 }
319#endif
320 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
321 icp->icmp6_type == ND_REDIRECT) {
322 /*
323 * ICMPv6 error
324 * Special case: for redirect (which is
325 * informational) we must not send icmp6 error.
326 */
327 icmp6stat.icp6s_canterror++;
328 goto freeit;
329 } else {
330 /* ICMPv6 informational - send the error */
331 }
332 } else {
333 /* non-ICMPv6 - send the error */
334 }
335
336 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
337
338 /* Finally, do rate limitation check. */
339 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
340 icmp6stat.icp6s_toofreq++;
341 goto freeit;
342 }
343
344 /*
345 * OK, ICMP6 can be generated.
346 */
347
348 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
349 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
350
351 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
352 M_PREPEND(m, preplen, M_DONTWAIT);
353 if (m && m->m_len < preplen)
354 m = m_pullup(m, preplen);
355 if (m == NULL) {
356 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
357 return;
358 }
359
360 nip6 = mtod(m, struct ip6_hdr *);
361 nip6->ip6_src = oip6->ip6_src;
362 nip6->ip6_dst = oip6->ip6_dst;
363
364 in6_clearscope(&oip6->ip6_src);
365 in6_clearscope(&oip6->ip6_dst);
366
367 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
368 icmp6->icmp6_type = type;
369 icmp6->icmp6_code = code;
370 icmp6->icmp6_pptr = htonl((u_int32_t)param);
371
372 /*
373 * icmp6_reflect() is designed to be in the input path.
374 * icmp6_error() can be called from both input and output path,
375 * and if we are in output path rcvif could contain bogus value.
376 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
377 * information in ip header (nip6).
378 */
379 m->m_pkthdr.rcvif = NULL;
380
381 icmp6stat.icp6s_outhist[type]++;
382 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
383
384 return;
385
386 freeit:
387 /*
388 * If we can't tell whether or not we can generate ICMP6, free it.
389 */
390 m_freem(m);
391}
392
393/*
394 * Process a received ICMP6 message.
395 */
396int
397icmp6_input(mp, offp, proto)
398 struct mbuf **mp;
399 int *offp, proto;
400{
401 struct mbuf *m = *mp, *n;
402 struct ip6_hdr *ip6, *nip6;
403 struct icmp6_hdr *icmp6, *nicmp6;
404 int off = *offp;
405 int icmp6len = m->m_pkthdr.len - *offp;
406 int code, sum, noff;
407 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
408
409#ifndef PULLDOWN_TEST
410 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
411 /* m might change if M_LOOP. So, call mtod after this */
412#endif
413
414 /*
415 * Locate icmp6 structure in mbuf, and check
416 * that not corrupted and of at least minimum length
417 */
418
419 ip6 = mtod(m, struct ip6_hdr *);
420 if (icmp6len < sizeof(struct icmp6_hdr)) {
421 icmp6stat.icp6s_tooshort++;
422 goto freeit;
423 }
424
425 /*
426 * calculate the checksum
427 */
428#ifndef PULLDOWN_TEST
429 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
430#else
431 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
432 if (icmp6 == NULL) {
433 icmp6stat.icp6s_tooshort++;
434 return IPPROTO_DONE;
435 }
436#endif
437 code = icmp6->icmp6_code;
438
439 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
440 nd6log((LOG_ERR,
441 "ICMP6 checksum error(%d|%x) %s\n",
442 icmp6->icmp6_type, sum,
443 ip6_sprintf(ip6bufs, &ip6->ip6_src)));
444 icmp6stat.icp6s_checksum++;
445 goto freeit;
446 }
447
448 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
449 /*
450 * Deliver very specific ICMP6 type only.
451 * This is important to deliver TOOBIG. Otherwise PMTUD
452 * will not work.
453 */
454 switch (icmp6->icmp6_type) {
455 case ICMP6_DST_UNREACH:
456 case ICMP6_PACKET_TOO_BIG:
457 case ICMP6_TIME_EXCEEDED:
458 break;
459 default:
460 goto freeit;
461 }
462 }
463
464 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
465 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
466 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
467 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
468
469 switch (icmp6->icmp6_type) {
470 case ICMP6_DST_UNREACH:
471 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
472 switch (code) {
473 case ICMP6_DST_UNREACH_NOROUTE:
474 code = PRC_UNREACH_NET;
475 break;
476 case ICMP6_DST_UNREACH_ADMIN:
477 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
478 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
479 break;
480 case ICMP6_DST_UNREACH_ADDR:
481 code = PRC_HOSTDEAD;
482 break;
483 case ICMP6_DST_UNREACH_BEYONDSCOPE:
484 /* I mean "source address was incorrect." */
485 code = PRC_PARAMPROB;
486 break;
487 case ICMP6_DST_UNREACH_NOPORT:
488 code = PRC_UNREACH_PORT;
489 break;
490 default:
491 goto badcode;
492 }
493 goto deliver;
494 break;
495
496 case ICMP6_PACKET_TOO_BIG:
497 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
498
499 /* validation is made in icmp6_mtudisc_update */
500
501 code = PRC_MSGSIZE;
502
503 /*
504 * Updating the path MTU will be done after examining
505 * intermediate extension headers.
506 */
507 goto deliver;
508 break;
509
510 case ICMP6_TIME_EXCEEDED:
511 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
512 switch (code) {
513 case ICMP6_TIME_EXCEED_TRANSIT:
514 code = PRC_TIMXCEED_INTRANS;
515 break;
516 case ICMP6_TIME_EXCEED_REASSEMBLY:
517 code = PRC_TIMXCEED_REASS;
518 break;
519 default:
520 goto badcode;
521 }
522 goto deliver;
523 break;
524
525 case ICMP6_PARAM_PROB:
526 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
527 switch (code) {
528 case ICMP6_PARAMPROB_NEXTHEADER:
529 code = PRC_UNREACH_PROTOCOL;
530 break;
531 case ICMP6_PARAMPROB_HEADER:
532 case ICMP6_PARAMPROB_OPTION:
533 code = PRC_PARAMPROB;
534 break;
535 default:
536 goto badcode;
537 }
538 goto deliver;
539 break;
540
541 case ICMP6_ECHO_REQUEST:
542 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
543 if (code != 0)
544 goto badcode;
545 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
546 /* Give up remote */
547 break;
548 }
549 if ((n->m_flags & M_EXT) != 0
550 || n->m_len < off + sizeof(struct icmp6_hdr)) {
551 struct mbuf *n0 = n;
552 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
553 int n0len;
554
555 MGETHDR(n, M_DONTWAIT, n0->m_type);
556 n0len = n0->m_pkthdr.len; /* save for use below */
557 if (n)
558 M_MOVE_PKTHDR(n, n0);
559 if (n && maxlen >= MHLEN) {
560 MCLGET(n, M_DONTWAIT);
561 if ((n->m_flags & M_EXT) == 0) {
562 m_free(n);
563 n = NULL;
564 }
565 }
566 if (n == NULL) {
567 /* Give up remote */
568 m_freem(n0);
569 break;
570 }
571 /*
572 * Copy IPv6 and ICMPv6 only.
573 */
574 nip6 = mtod(n, struct ip6_hdr *);
575 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
576 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
577 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
578 noff = sizeof(struct ip6_hdr);
579 /* new mbuf contains only ipv6+icmpv6 headers */
580 n->m_len = noff + sizeof(struct icmp6_hdr);
581 /*
582 * Adjust mbuf. ip6_plen will be adjusted in
583 * ip6_output().
584 */
585 m_adj(n0, off + sizeof(struct icmp6_hdr));
586 /* recalculate complete packet size */
587 n->m_pkthdr.len = n0len + (noff - off);
588 n->m_next = n0;
589 } else {
590 nip6 = mtod(n, struct ip6_hdr *);
591 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
592 sizeof(*nicmp6));
593 noff = off;
594 }
595 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
596 nicmp6->icmp6_code = 0;
597 if (n) {
598 icmp6stat.icp6s_reflect++;
599 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
600 icmp6_reflect(n, noff);
601 }
602 break;
603
604 case ICMP6_ECHO_REPLY:
605 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
606 if (code != 0)
607 goto badcode;
608 break;
609
610 case MLD_LISTENER_QUERY:
611 case MLD_LISTENER_REPORT:
612 if (icmp6len < sizeof(struct mld_hdr))
613 goto badlen;
614 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
615 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
616 else
617 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
618 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
619 /* give up local */
620 mld6_input(m, off);
621 m = NULL;
622 goto freeit;
623 }
624 mld6_input(n, off);
625 /* m stays. */
626 break;
627
628 case MLD_LISTENER_DONE:
629 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
630 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
631 goto badlen;
632 break; /* nothing to be done in kernel */
633
634 case MLD_MTRACE_RESP:
635 case MLD_MTRACE:
636 /* XXX: these two are experimental. not officially defined. */
637 /* XXX: per-interface statistics? */
638 break; /* just pass it to applications */
639
640 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
641 {
642 enum { WRU, FQDN } mode;
643
644 if (!icmp6_nodeinfo)
645 break;
646
647 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
648 mode = WRU;
649 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
650 mode = FQDN;
651 else
652 goto badlen;
653
654#define hostnamelen strlen(hostname)
655 if (mode == FQDN) {
656#ifndef PULLDOWN_TEST
657 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
658 IPPROTO_DONE);
659#endif
660 n = m_copy(m, 0, M_COPYALL);
661 if (n)
662 n = ni6_input(n, off);
663 /* XXX meaningless if n == NULL */
664 noff = sizeof(struct ip6_hdr);
665 } else {
666 u_char *p;
667 int maxlen, maxhlen;
668
|
| 669 /*
670 * XXX: this combination of flags is pointless,
671 * but should we keep this for compatibility?
672 */
|
669 if ((icmp6_nodeinfo & 5) != 5)
670 break;
671
672 if (code != 0)
673 goto badcode;
674 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
675 if (maxlen >= MCLBYTES) {
676 /* Give up remote */
677 break;
678 }
679 MGETHDR(n, M_DONTWAIT, m->m_type);
680 if (n && maxlen > MHLEN) {
681 MCLGET(n, M_DONTWAIT);
682 if ((n->m_flags & M_EXT) == 0) {
683 m_free(n);
684 n = NULL;
685 }
686 }
687 if (n && !m_dup_pkthdr(n, m, M_DONTWAIT)) {
688 /*
689 * Previous code did a blind M_COPY_PKTHDR
690 * and said "just for rcvif". If true, then
691 * we could tolerate the dup failing (due to
692 * the deep copy of the tag chain). For now
693 * be conservative and just fail.
694 */
695 m_free(n);
696 n = NULL;
697 }
698 if (n == NULL) {
699 /* Give up remote */
700 break;
701 }
702 n->m_pkthdr.rcvif = NULL;
703 n->m_len = 0;
704 maxhlen = M_TRAILINGSPACE(n) - maxlen;
705 if (maxhlen > hostnamelen)
706 maxhlen = hostnamelen;
707 /*
708 * Copy IPv6 and ICMPv6 only.
709 */
710 nip6 = mtod(n, struct ip6_hdr *);
711 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
712 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
713 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
714 p = (u_char *)(nicmp6 + 1);
715 bzero(p, 4);
716 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
717 noff = sizeof(struct ip6_hdr);
718 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
719 sizeof(struct icmp6_hdr) + 4 + maxhlen;
720 nicmp6->icmp6_type = ICMP6_WRUREPLY;
721 nicmp6->icmp6_code = 0;
722 }
723#undef hostnamelen
724 if (n) {
725 icmp6stat.icp6s_reflect++;
726 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
727 icmp6_reflect(n, noff);
728 }
729 break;
730 }
731
732 case ICMP6_WRUREPLY:
733 if (code != 0)
734 goto badcode;
735 break;
736
737 case ND_ROUTER_SOLICIT:
738 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
739 if (code != 0)
740 goto badcode;
741 if (icmp6len < sizeof(struct nd_router_solicit))
742 goto badlen;
743 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
744 /* give up local */
745 nd6_rs_input(m, off, icmp6len);
746 m = NULL;
747 goto freeit;
748 }
749 nd6_rs_input(n, off, icmp6len);
750 /* m stays. */
751 break;
752
753 case ND_ROUTER_ADVERT:
754 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
755 if (code != 0)
756 goto badcode;
757 if (icmp6len < sizeof(struct nd_router_advert))
758 goto badlen;
759 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
760 /* give up local */
761 nd6_ra_input(m, off, icmp6len);
762 m = NULL;
763 goto freeit;
764 }
765 nd6_ra_input(n, off, icmp6len);
766 /* m stays. */
767 break;
768
769 case ND_NEIGHBOR_SOLICIT:
770 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
771 if (code != 0)
772 goto badcode;
773 if (icmp6len < sizeof(struct nd_neighbor_solicit))
774 goto badlen;
775 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
776 /* give up local */
777 nd6_ns_input(m, off, icmp6len);
778 m = NULL;
779 goto freeit;
780 }
781 nd6_ns_input(n, off, icmp6len);
782 /* m stays. */
783 break;
784
785 case ND_NEIGHBOR_ADVERT:
786 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
787 if (code != 0)
788 goto badcode;
789 if (icmp6len < sizeof(struct nd_neighbor_advert))
790 goto badlen;
791 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
792 /* give up local */
793 nd6_na_input(m, off, icmp6len);
794 m = NULL;
795 goto freeit;
796 }
797 nd6_na_input(n, off, icmp6len);
798 /* m stays. */
799 break;
800
801 case ND_REDIRECT:
802 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
803 if (code != 0)
804 goto badcode;
805 if (icmp6len < sizeof(struct nd_redirect))
806 goto badlen;
807 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
808 /* give up local */
809 icmp6_redirect_input(m, off);
810 m = NULL;
811 goto freeit;
812 }
813 icmp6_redirect_input(n, off);
814 /* m stays. */
815 break;
816
817 case ICMP6_ROUTER_RENUMBERING:
818 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
819 code != ICMP6_ROUTER_RENUMBERING_RESULT)
820 goto badcode;
821 if (icmp6len < sizeof(struct icmp6_router_renum))
822 goto badlen;
823 break;
824
825 default:
826 nd6log((LOG_DEBUG,
827 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
828 icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src),
829 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
830 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
831 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
832 /* ICMPv6 error: MUST deliver it by spec... */
833 code = PRC_NCMDS;
834 /* deliver */
835 } else {
836 /* ICMPv6 informational: MUST not deliver */
837 break;
838 }
839 deliver:
840 if (icmp6_notify_error(&m, off, icmp6len, code)) {
841 /* In this case, m should've been freed. */
842 return (IPPROTO_DONE);
843 }
844 break;
845
846 badcode:
847 icmp6stat.icp6s_badcode++;
848 break;
849
850 badlen:
851 icmp6stat.icp6s_badlen++;
852 break;
853 }
854
855 /* deliver the packet to appropriate sockets */
856 icmp6_rip6_input(&m, *offp);
857
858 return IPPROTO_DONE;
859
860 freeit:
861 m_freem(m);
862 return IPPROTO_DONE;
863}
864
865static int
866icmp6_notify_error(mp, off, icmp6len, code)
867 struct mbuf **mp;
868 int off, icmp6len, code;
869{
870 struct mbuf *m = *mp;
871 struct icmp6_hdr *icmp6;
872 struct ip6_hdr *eip6;
873 u_int32_t notifymtu;
874 struct sockaddr_in6 icmp6src, icmp6dst;
875
876 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
877 icmp6stat.icp6s_tooshort++;
878 goto freeit;
879 }
880#ifndef PULLDOWN_TEST
881 IP6_EXTHDR_CHECK(m, off,
882 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1);
883 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
884#else
885 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
886 sizeof(*icmp6) + sizeof(struct ip6_hdr));
887 if (icmp6 == NULL) {
888 icmp6stat.icp6s_tooshort++;
889 return (-1);
890 }
891#endif
892 eip6 = (struct ip6_hdr *)(icmp6 + 1);
893
894 /* Detect the upper level protocol */
895 {
896 void (*ctlfunc) __P((int, struct sockaddr *, void *));
897 u_int8_t nxt = eip6->ip6_nxt;
898 int eoff = off + sizeof(struct icmp6_hdr) +
899 sizeof(struct ip6_hdr);
900 struct ip6ctlparam ip6cp;
901 struct in6_addr *finaldst = NULL;
902 int icmp6type = icmp6->icmp6_type;
903 struct ip6_frag *fh;
904 struct ip6_rthdr *rth;
905 struct ip6_rthdr0 *rth0;
906 int rthlen;
907
908 while (1) { /* XXX: should avoid infinite loop explicitly? */
909 struct ip6_ext *eh;
910
911 switch (nxt) {
912 case IPPROTO_HOPOPTS:
913 case IPPROTO_DSTOPTS:
914 case IPPROTO_AH:
915#ifndef PULLDOWN_TEST
916 IP6_EXTHDR_CHECK(m, 0,
917 eoff + sizeof(struct ip6_ext), -1);
918 eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff);
919#else
920 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
921 eoff, sizeof(*eh));
922 if (eh == NULL) {
923 icmp6stat.icp6s_tooshort++;
924 return (-1);
925 }
926#endif
927
928 if (nxt == IPPROTO_AH)
929 eoff += (eh->ip6e_len + 2) << 2;
930 else
931 eoff += (eh->ip6e_len + 1) << 3;
932 nxt = eh->ip6e_nxt;
933 break;
934 case IPPROTO_ROUTING:
935 /*
936 * When the erroneous packet contains a
937 * routing header, we should examine the
938 * header to determine the final destination.
939 * Otherwise, we can't properly update
940 * information that depends on the final
941 * destination (e.g. path MTU).
942 */
943#ifndef PULLDOWN_TEST
944 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1);
945 rth = (struct ip6_rthdr *)
946 (mtod(m, caddr_t) + eoff);
947#else
948 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
949 eoff, sizeof(*rth));
950 if (rth == NULL) {
951 icmp6stat.icp6s_tooshort++;
952 return (-1);
953 }
954#endif
955 rthlen = (rth->ip6r_len + 1) << 3;
956 /*
957 * XXX: currently there is no
958 * officially defined type other
959 * than type-0.
960 * Note that if the segment left field
961 * is 0, all intermediate hops must
962 * have been passed.
963 */
964 if (rth->ip6r_segleft &&
965 rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
966 int hops;
967
968#ifndef PULLDOWN_TEST
969 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1);
970 rth0 = (struct ip6_rthdr0 *)
971 (mtod(m, caddr_t) + eoff);
972#else
973 IP6_EXTHDR_GET(rth0,
974 struct ip6_rthdr0 *, m,
975 eoff, rthlen);
976 if (rth0 == NULL) {
977 icmp6stat.icp6s_tooshort++;
978 return (-1);
979 }
980#endif
981 /* just ignore a bogus header */
982 if ((rth0->ip6r0_len % 2) == 0 &&
983 (hops = rth0->ip6r0_len/2))
984 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
985 }
986 eoff += rthlen;
987 nxt = rth->ip6r_nxt;
988 break;
989 case IPPROTO_FRAGMENT:
990#ifndef PULLDOWN_TEST
991 IP6_EXTHDR_CHECK(m, 0, eoff +
992 sizeof(struct ip6_frag), -1);
993 fh = (struct ip6_frag *)(mtod(m, caddr_t) +
994 eoff);
995#else
996 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
997 eoff, sizeof(*fh));
998 if (fh == NULL) {
999 icmp6stat.icp6s_tooshort++;
1000 return (-1);
1001 }
1002#endif
1003 /*
1004 * Data after a fragment header is meaningless
1005 * unless it is the first fragment, but
1006 * we'll go to the notify label for path MTU
1007 * discovery.
1008 */
1009 if (fh->ip6f_offlg & IP6F_OFF_MASK)
1010 goto notify;
1011
1012 eoff += sizeof(struct ip6_frag);
1013 nxt = fh->ip6f_nxt;
1014 break;
1015 default:
1016 /*
1017 * This case includes ESP and the No Next
1018 * Header. In such cases going to the notify
1019 * label does not have any meaning
1020 * (i.e. ctlfunc will be NULL), but we go
1021 * anyway since we might have to update
1022 * path MTU information.
1023 */
1024 goto notify;
1025 }
1026 }
1027 notify:
1028#ifndef PULLDOWN_TEST
1029 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1030#else
1031 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1032 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1033 if (icmp6 == NULL) {
1034 icmp6stat.icp6s_tooshort++;
1035 return (-1);
1036 }
1037#endif
1038
1039 /*
1040 * retrieve parameters from the inner IPv6 header, and convert
1041 * them into sockaddr structures.
1042 * XXX: there is no guarantee that the source or destination
1043 * addresses of the inner packet are in the same scope as
1044 * the addresses of the icmp packet. But there is no other
1045 * way to determine the zone.
1046 */
1047 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1048
1049 bzero(&icmp6dst, sizeof(icmp6dst));
1050 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1051 icmp6dst.sin6_family = AF_INET6;
1052 if (finaldst == NULL)
1053 icmp6dst.sin6_addr = eip6->ip6_dst;
1054 else
1055 icmp6dst.sin6_addr = *finaldst;
1056 if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
1057 goto freeit;
1058 bzero(&icmp6src, sizeof(icmp6src));
1059 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1060 icmp6src.sin6_family = AF_INET6;
1061 icmp6src.sin6_addr = eip6->ip6_src;
1062 if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
1063 goto freeit;
1064 icmp6src.sin6_flowinfo =
1065 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1066
1067 if (finaldst == NULL)
1068 finaldst = &eip6->ip6_dst;
1069 ip6cp.ip6c_m = m;
1070 ip6cp.ip6c_icmp6 = icmp6;
1071 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1072 ip6cp.ip6c_off = eoff;
1073 ip6cp.ip6c_finaldst = finaldst;
1074 ip6cp.ip6c_src = &icmp6src;
1075 ip6cp.ip6c_nxt = nxt;
1076
1077 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1078 notifymtu = ntohl(icmp6->icmp6_mtu);
1079 ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
1080 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1081 }
1082
1083 ctlfunc = (void (*) __P((int, struct sockaddr *, void *)))
1084 (inet6sw[ip6_protox[nxt]].pr_ctlinput);
1085 if (ctlfunc) {
1086 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
1087 &ip6cp);
1088 }
1089 }
1090 *mp = m;
1091 return (0);
1092
1093 freeit:
1094 m_freem(m);
1095 return (-1);
1096}
1097
1098void
1099icmp6_mtudisc_update(ip6cp, validated)
1100 struct ip6ctlparam *ip6cp;
1101 int validated;
1102{
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 in_conninfo inc;
1108
1109#if 0
1110 /*
1111 * RFC2460 section 5, last paragraph.
1112 * even though minimum link MTU for IPv6 is IPV6_MMTU,
1113 * we may see ICMPv6 too big with mtu < IPV6_MMTU
1114 * due to packet translator in the middle.
1115 * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for
1116 * special handling.
1117 */
1118 if (mtu < IPV6_MMTU)
1119 return;
1120#endif
1121
1122 /*
1123 * we reject ICMPv6 too big with abnormally small value.
1124 * XXX what is the good definition of "abnormally small"?
1125 */
1126 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
1127 return;
1128
1129 if (!validated)
1130 return;
1131
1132 bzero(&inc, sizeof(inc));
1133 inc.inc_flags = 1; /* IPv6 */
1134 inc.inc6_faddr = *dst;
1135 if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL))
1136 return;
1137
1138 if (mtu < tcp_maxmtu6(&inc, NULL)) {
1139 tcp_hc_updatemtu(&inc, mtu);
1140 icmp6stat.icp6s_pmtuchg++;
1141 }
1142}
1143
1144/*
1145 * Process a Node Information Query packet, based on
1146 * draft-ietf-ipngwg-icmp-name-lookups-07.
1147 *
1148 * Spec incompatibilities:
1149 * - IPv6 Subject address handling
1150 * - IPv4 Subject address handling support missing
1151 * - Proxy reply (answer even if it's not for me)
1152 * - joins NI group address at in6_ifattach() time only, does not cope
1153 * with hostname changes by sethostname(3)
1154 */
1155#define hostnamelen strlen(hostname)
1156static struct mbuf *
1157ni6_input(m, off)
1158 struct mbuf *m;
1159 int off;
1160{
1161 struct icmp6_nodeinfo *ni6, *nni6;
1162 struct mbuf *n = NULL;
1163 u_int16_t qtype;
1164 int subjlen;
1165 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1166 struct ni_reply_fqdn *fqdn;
1167 int addrs; /* for NI_QTYPE_NODEADDR */
1168 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1169 struct in6_addr in6_subj; /* subject address */
1170 struct ip6_hdr *ip6;
1171 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1172 char *subj = NULL;
1173 struct in6_ifaddr *ia6 = NULL;
1174
1175 ip6 = mtod(m, struct ip6_hdr *);
1176#ifndef PULLDOWN_TEST
1177 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1178#else
1179 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1180 if (ni6 == NULL) {
1181 /* m is already reclaimed */
1182 return (NULL);
1183 }
1184#endif
1185
1186 /*
| 673 if ((icmp6_nodeinfo & 5) != 5)
674 break;
675
676 if (code != 0)
677 goto badcode;
678 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
679 if (maxlen >= MCLBYTES) {
680 /* Give up remote */
681 break;
682 }
683 MGETHDR(n, M_DONTWAIT, m->m_type);
684 if (n && maxlen > MHLEN) {
685 MCLGET(n, M_DONTWAIT);
686 if ((n->m_flags & M_EXT) == 0) {
687 m_free(n);
688 n = NULL;
689 }
690 }
691 if (n && !m_dup_pkthdr(n, m, M_DONTWAIT)) {
692 /*
693 * Previous code did a blind M_COPY_PKTHDR
694 * and said "just for rcvif". If true, then
695 * we could tolerate the dup failing (due to
696 * the deep copy of the tag chain). For now
697 * be conservative and just fail.
698 */
699 m_free(n);
700 n = NULL;
701 }
702 if (n == NULL) {
703 /* Give up remote */
704 break;
705 }
706 n->m_pkthdr.rcvif = NULL;
707 n->m_len = 0;
708 maxhlen = M_TRAILINGSPACE(n) - maxlen;
709 if (maxhlen > hostnamelen)
710 maxhlen = hostnamelen;
711 /*
712 * Copy IPv6 and ICMPv6 only.
713 */
714 nip6 = mtod(n, struct ip6_hdr *);
715 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
716 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
717 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
718 p = (u_char *)(nicmp6 + 1);
719 bzero(p, 4);
720 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
721 noff = sizeof(struct ip6_hdr);
722 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
723 sizeof(struct icmp6_hdr) + 4 + maxhlen;
724 nicmp6->icmp6_type = ICMP6_WRUREPLY;
725 nicmp6->icmp6_code = 0;
726 }
727#undef hostnamelen
728 if (n) {
729 icmp6stat.icp6s_reflect++;
730 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
731 icmp6_reflect(n, noff);
732 }
733 break;
734 }
735
736 case ICMP6_WRUREPLY:
737 if (code != 0)
738 goto badcode;
739 break;
740
741 case ND_ROUTER_SOLICIT:
742 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
743 if (code != 0)
744 goto badcode;
745 if (icmp6len < sizeof(struct nd_router_solicit))
746 goto badlen;
747 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
748 /* give up local */
749 nd6_rs_input(m, off, icmp6len);
750 m = NULL;
751 goto freeit;
752 }
753 nd6_rs_input(n, off, icmp6len);
754 /* m stays. */
755 break;
756
757 case ND_ROUTER_ADVERT:
758 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
759 if (code != 0)
760 goto badcode;
761 if (icmp6len < sizeof(struct nd_router_advert))
762 goto badlen;
763 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
764 /* give up local */
765 nd6_ra_input(m, off, icmp6len);
766 m = NULL;
767 goto freeit;
768 }
769 nd6_ra_input(n, off, icmp6len);
770 /* m stays. */
771 break;
772
773 case ND_NEIGHBOR_SOLICIT:
774 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
775 if (code != 0)
776 goto badcode;
777 if (icmp6len < sizeof(struct nd_neighbor_solicit))
778 goto badlen;
779 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
780 /* give up local */
781 nd6_ns_input(m, off, icmp6len);
782 m = NULL;
783 goto freeit;
784 }
785 nd6_ns_input(n, off, icmp6len);
786 /* m stays. */
787 break;
788
789 case ND_NEIGHBOR_ADVERT:
790 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
791 if (code != 0)
792 goto badcode;
793 if (icmp6len < sizeof(struct nd_neighbor_advert))
794 goto badlen;
795 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
796 /* give up local */
797 nd6_na_input(m, off, icmp6len);
798 m = NULL;
799 goto freeit;
800 }
801 nd6_na_input(n, off, icmp6len);
802 /* m stays. */
803 break;
804
805 case ND_REDIRECT:
806 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
807 if (code != 0)
808 goto badcode;
809 if (icmp6len < sizeof(struct nd_redirect))
810 goto badlen;
811 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
812 /* give up local */
813 icmp6_redirect_input(m, off);
814 m = NULL;
815 goto freeit;
816 }
817 icmp6_redirect_input(n, off);
818 /* m stays. */
819 break;
820
821 case ICMP6_ROUTER_RENUMBERING:
822 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
823 code != ICMP6_ROUTER_RENUMBERING_RESULT)
824 goto badcode;
825 if (icmp6len < sizeof(struct icmp6_router_renum))
826 goto badlen;
827 break;
828
829 default:
830 nd6log((LOG_DEBUG,
831 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
832 icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src),
833 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
834 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
835 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
836 /* ICMPv6 error: MUST deliver it by spec... */
837 code = PRC_NCMDS;
838 /* deliver */
839 } else {
840 /* ICMPv6 informational: MUST not deliver */
841 break;
842 }
843 deliver:
844 if (icmp6_notify_error(&m, off, icmp6len, code)) {
845 /* In this case, m should've been freed. */
846 return (IPPROTO_DONE);
847 }
848 break;
849
850 badcode:
851 icmp6stat.icp6s_badcode++;
852 break;
853
854 badlen:
855 icmp6stat.icp6s_badlen++;
856 break;
857 }
858
859 /* deliver the packet to appropriate sockets */
860 icmp6_rip6_input(&m, *offp);
861
862 return IPPROTO_DONE;
863
864 freeit:
865 m_freem(m);
866 return IPPROTO_DONE;
867}
868
869static int
870icmp6_notify_error(mp, off, icmp6len, code)
871 struct mbuf **mp;
872 int off, icmp6len, code;
873{
874 struct mbuf *m = *mp;
875 struct icmp6_hdr *icmp6;
876 struct ip6_hdr *eip6;
877 u_int32_t notifymtu;
878 struct sockaddr_in6 icmp6src, icmp6dst;
879
880 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
881 icmp6stat.icp6s_tooshort++;
882 goto freeit;
883 }
884#ifndef PULLDOWN_TEST
885 IP6_EXTHDR_CHECK(m, off,
886 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1);
887 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
888#else
889 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
890 sizeof(*icmp6) + sizeof(struct ip6_hdr));
891 if (icmp6 == NULL) {
892 icmp6stat.icp6s_tooshort++;
893 return (-1);
894 }
895#endif
896 eip6 = (struct ip6_hdr *)(icmp6 + 1);
897
898 /* Detect the upper level protocol */
899 {
900 void (*ctlfunc) __P((int, struct sockaddr *, void *));
901 u_int8_t nxt = eip6->ip6_nxt;
902 int eoff = off + sizeof(struct icmp6_hdr) +
903 sizeof(struct ip6_hdr);
904 struct ip6ctlparam ip6cp;
905 struct in6_addr *finaldst = NULL;
906 int icmp6type = icmp6->icmp6_type;
907 struct ip6_frag *fh;
908 struct ip6_rthdr *rth;
909 struct ip6_rthdr0 *rth0;
910 int rthlen;
911
912 while (1) { /* XXX: should avoid infinite loop explicitly? */
913 struct ip6_ext *eh;
914
915 switch (nxt) {
916 case IPPROTO_HOPOPTS:
917 case IPPROTO_DSTOPTS:
918 case IPPROTO_AH:
919#ifndef PULLDOWN_TEST
920 IP6_EXTHDR_CHECK(m, 0,
921 eoff + sizeof(struct ip6_ext), -1);
922 eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff);
923#else
924 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
925 eoff, sizeof(*eh));
926 if (eh == NULL) {
927 icmp6stat.icp6s_tooshort++;
928 return (-1);
929 }
930#endif
931
932 if (nxt == IPPROTO_AH)
933 eoff += (eh->ip6e_len + 2) << 2;
934 else
935 eoff += (eh->ip6e_len + 1) << 3;
936 nxt = eh->ip6e_nxt;
937 break;
938 case IPPROTO_ROUTING:
939 /*
940 * When the erroneous packet contains a
941 * routing header, we should examine the
942 * header to determine the final destination.
943 * Otherwise, we can't properly update
944 * information that depends on the final
945 * destination (e.g. path MTU).
946 */
947#ifndef PULLDOWN_TEST
948 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1);
949 rth = (struct ip6_rthdr *)
950 (mtod(m, caddr_t) + eoff);
951#else
952 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
953 eoff, sizeof(*rth));
954 if (rth == NULL) {
955 icmp6stat.icp6s_tooshort++;
956 return (-1);
957 }
958#endif
959 rthlen = (rth->ip6r_len + 1) << 3;
960 /*
961 * XXX: currently there is no
962 * officially defined type other
963 * than type-0.
964 * Note that if the segment left field
965 * is 0, all intermediate hops must
966 * have been passed.
967 */
968 if (rth->ip6r_segleft &&
969 rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
970 int hops;
971
972#ifndef PULLDOWN_TEST
973 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1);
974 rth0 = (struct ip6_rthdr0 *)
975 (mtod(m, caddr_t) + eoff);
976#else
977 IP6_EXTHDR_GET(rth0,
978 struct ip6_rthdr0 *, m,
979 eoff, rthlen);
980 if (rth0 == NULL) {
981 icmp6stat.icp6s_tooshort++;
982 return (-1);
983 }
984#endif
985 /* just ignore a bogus header */
986 if ((rth0->ip6r0_len % 2) == 0 &&
987 (hops = rth0->ip6r0_len/2))
988 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
989 }
990 eoff += rthlen;
991 nxt = rth->ip6r_nxt;
992 break;
993 case IPPROTO_FRAGMENT:
994#ifndef PULLDOWN_TEST
995 IP6_EXTHDR_CHECK(m, 0, eoff +
996 sizeof(struct ip6_frag), -1);
997 fh = (struct ip6_frag *)(mtod(m, caddr_t) +
998 eoff);
999#else
1000 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
1001 eoff, sizeof(*fh));
1002 if (fh == NULL) {
1003 icmp6stat.icp6s_tooshort++;
1004 return (-1);
1005 }
1006#endif
1007 /*
1008 * Data after a fragment header is meaningless
1009 * unless it is the first fragment, but
1010 * we'll go to the notify label for path MTU
1011 * discovery.
1012 */
1013 if (fh->ip6f_offlg & IP6F_OFF_MASK)
1014 goto notify;
1015
1016 eoff += sizeof(struct ip6_frag);
1017 nxt = fh->ip6f_nxt;
1018 break;
1019 default:
1020 /*
1021 * This case includes ESP and the No Next
1022 * Header. In such cases going to the notify
1023 * label does not have any meaning
1024 * (i.e. ctlfunc will be NULL), but we go
1025 * anyway since we might have to update
1026 * path MTU information.
1027 */
1028 goto notify;
1029 }
1030 }
1031 notify:
1032#ifndef PULLDOWN_TEST
1033 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1034#else
1035 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1036 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1037 if (icmp6 == NULL) {
1038 icmp6stat.icp6s_tooshort++;
1039 return (-1);
1040 }
1041#endif
1042
1043 /*
1044 * retrieve parameters from the inner IPv6 header, and convert
1045 * them into sockaddr structures.
1046 * XXX: there is no guarantee that the source or destination
1047 * addresses of the inner packet are in the same scope as
1048 * the addresses of the icmp packet. But there is no other
1049 * way to determine the zone.
1050 */
1051 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1052
1053 bzero(&icmp6dst, sizeof(icmp6dst));
1054 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1055 icmp6dst.sin6_family = AF_INET6;
1056 if (finaldst == NULL)
1057 icmp6dst.sin6_addr = eip6->ip6_dst;
1058 else
1059 icmp6dst.sin6_addr = *finaldst;
1060 if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
1061 goto freeit;
1062 bzero(&icmp6src, sizeof(icmp6src));
1063 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1064 icmp6src.sin6_family = AF_INET6;
1065 icmp6src.sin6_addr = eip6->ip6_src;
1066 if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
1067 goto freeit;
1068 icmp6src.sin6_flowinfo =
1069 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1070
1071 if (finaldst == NULL)
1072 finaldst = &eip6->ip6_dst;
1073 ip6cp.ip6c_m = m;
1074 ip6cp.ip6c_icmp6 = icmp6;
1075 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1076 ip6cp.ip6c_off = eoff;
1077 ip6cp.ip6c_finaldst = finaldst;
1078 ip6cp.ip6c_src = &icmp6src;
1079 ip6cp.ip6c_nxt = nxt;
1080
1081 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1082 notifymtu = ntohl(icmp6->icmp6_mtu);
1083 ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
1084 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1085 }
1086
1087 ctlfunc = (void (*) __P((int, struct sockaddr *, void *)))
1088 (inet6sw[ip6_protox[nxt]].pr_ctlinput);
1089 if (ctlfunc) {
1090 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
1091 &ip6cp);
1092 }
1093 }
1094 *mp = m;
1095 return (0);
1096
1097 freeit:
1098 m_freem(m);
1099 return (-1);
1100}
1101
1102void
1103icmp6_mtudisc_update(ip6cp, validated)
1104 struct ip6ctlparam *ip6cp;
1105 int validated;
1106{
1107 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1108 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1109 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1110 u_int mtu = ntohl(icmp6->icmp6_mtu);
1111 struct in_conninfo inc;
1112
1113#if 0
1114 /*
1115 * RFC2460 section 5, last paragraph.
1116 * even though minimum link MTU for IPv6 is IPV6_MMTU,
1117 * we may see ICMPv6 too big with mtu < IPV6_MMTU
1118 * due to packet translator in the middle.
1119 * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for
1120 * special handling.
1121 */
1122 if (mtu < IPV6_MMTU)
1123 return;
1124#endif
1125
1126 /*
1127 * we reject ICMPv6 too big with abnormally small value.
1128 * XXX what is the good definition of "abnormally small"?
1129 */
1130 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
1131 return;
1132
1133 if (!validated)
1134 return;
1135
1136 bzero(&inc, sizeof(inc));
1137 inc.inc_flags = 1; /* IPv6 */
1138 inc.inc6_faddr = *dst;
1139 if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL))
1140 return;
1141
1142 if (mtu < tcp_maxmtu6(&inc, NULL)) {
1143 tcp_hc_updatemtu(&inc, mtu);
1144 icmp6stat.icp6s_pmtuchg++;
1145 }
1146}
1147
1148/*
1149 * Process a Node Information Query packet, based on
1150 * draft-ietf-ipngwg-icmp-name-lookups-07.
1151 *
1152 * Spec incompatibilities:
1153 * - IPv6 Subject address handling
1154 * - IPv4 Subject address handling support missing
1155 * - Proxy reply (answer even if it's not for me)
1156 * - joins NI group address at in6_ifattach() time only, does not cope
1157 * with hostname changes by sethostname(3)
1158 */
1159#define hostnamelen strlen(hostname)
1160static struct mbuf *
1161ni6_input(m, off)
1162 struct mbuf *m;
1163 int off;
1164{
1165 struct icmp6_nodeinfo *ni6, *nni6;
1166 struct mbuf *n = NULL;
1167 u_int16_t qtype;
1168 int subjlen;
1169 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1170 struct ni_reply_fqdn *fqdn;
1171 int addrs; /* for NI_QTYPE_NODEADDR */
1172 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1173 struct in6_addr in6_subj; /* subject address */
1174 struct ip6_hdr *ip6;
1175 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1176 char *subj = NULL;
1177 struct in6_ifaddr *ia6 = NULL;
1178
1179 ip6 = mtod(m, struct ip6_hdr *);
1180#ifndef PULLDOWN_TEST
1181 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1182#else
1183 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1184 if (ni6 == NULL) {
1185 /* m is already reclaimed */
1186 return (NULL);
1187 }
1188#endif
1189
1190 /*
|
| 1191 * Validate IPv6 source address.
1192 * The default configuration MUST be to refuse answering queries from
1193 * global-scope addresses according to RFC4602.
1194 * Notes:
1195 * - it's not very clear what "refuse" means; this implementation
1196 * simply drops it.
1197 * - it's not very easy to identify global-scope (unicast) addresses
1198 * since there are many prefixes for them. It should be safer
1199 * and in practice sufficient to check "all" but loopback and
1200 * link-local (note that site-local unicast was deprecated and
1201 * ULA is defined as global scope-wise)
1202 */
1203 if ((icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 &&
1204 !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) &&
1205 !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
1206 goto bad;
1207
1208 /*
|
1187 * Validate IPv6 destination address.
1188 *
1189 * The Responder must discard the Query without further processing
1190 * unless it is one of the Responder's unicast or anycast addresses, or
1191 * a link-local scope multicast address which the Responder has joined.
| 1209 * Validate IPv6 destination address.
1210 *
1211 * The Responder must discard the Query without further processing
1212 * unless it is one of the Responder's unicast or anycast addresses, or
1213 * a link-local scope multicast address which the Responder has joined.
|
1192 * [icmp-name-lookups-08, Section 4.]
| 1214 * [RFC4602, Section 5.]
|
1193 */
1194 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
1195 if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1196 goto bad;
1197 /* else it's a link-local multicast, fine */
1198 } else { /* unicast or anycast */
1199 if ((ia6 = ip6_getdstifaddr(m)) == NULL)
1200 goto bad; /* XXX impossible */
1201
1202 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
| 1215 */
1216 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
1217 if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1218 goto bad;
1219 /* else it's a link-local multicast, fine */
1220 } else { /* unicast or anycast */
1221 if ((ia6 = ip6_getdstifaddr(m)) == NULL)
1222 goto bad; /* XXX impossible */
1223
1224 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
|
1203 !(icmp6_nodeinfo & 4)) {
| 1225 !(icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) {
|
1204 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1205 "a temporary address in %s:%d",
1206 __FILE__, __LINE__));
1207 goto bad;
1208 }
1209 }
1210
1211 /* validate query Subject field. */
1212 qtype = ntohs(ni6->ni_qtype);
1213 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1214 switch (qtype) {
1215 case NI_QTYPE_NOOP:
1216 case NI_QTYPE_SUPTYPES:
1217 /* 07 draft */
1218 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1219 break;
1220 /* FALLTHROUGH */
1221 case NI_QTYPE_FQDN:
1222 case NI_QTYPE_NODEADDR:
1223 case NI_QTYPE_IPV4ADDR:
1224 switch (ni6->ni_code) {
1225 case ICMP6_NI_SUBJ_IPV6:
1226#if ICMP6_NI_SUBJ_IPV6 != 0
1227 case 0:
1228#endif
1229 /*
1230 * backward compatibility - try to accept 03 draft
1231 * format, where no Subject is present.
1232 */
1233 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1234 subjlen == 0) {
1235 oldfqdn++;
1236 break;
1237 }
1238#if ICMP6_NI_SUBJ_IPV6 != 0
1239 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1240 goto bad;
1241#endif
1242
1243 if (subjlen != sizeof(struct in6_addr))
1244 goto bad;
1245
1246 /*
1247 * Validate Subject address.
1248 *
1249 * Not sure what exactly "address belongs to the node"
1250 * means in the spec, is it just unicast, or what?
1251 *
1252 * At this moment we consider Subject address as
1253 * "belong to the node" if the Subject address equals
1254 * to the IPv6 destination address; validation for
1255 * IPv6 destination address should have done enough
1256 * check for us.
1257 *
1258 * We do not do proxy at this moment.
1259 */
1260 /* m_pulldown instead of copy? */
1261 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1262 subjlen, (caddr_t)&in6_subj);
1263 if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL))
1264 goto bad;
1265
1266 subj = (char *)&in6_subj;
1267 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
1268 break;
1269
1270 /*
1271 * XXX if we are to allow other cases, we should really
1272 * be careful about scope here.
1273 * basically, we should disallow queries toward IPv6
1274 * destination X with subject Y,
1275 * if scope(X) > scope(Y).
1276 * if we allow scope(X) > scope(Y), it will result in
1277 * information leakage across scope boundary.
1278 */
1279 goto bad;
1280
1281 case ICMP6_NI_SUBJ_FQDN:
1282 /*
1283 * Validate Subject name with gethostname(3).
1284 *
1285 * The behavior may need some debate, since:
1286 * - we are not sure if the node has FQDN as
1287 * hostname (returned by gethostname(3)).
1288 * - the code does wildcard match for truncated names.
1289 * however, we are not sure if we want to perform
1290 * wildcard match, if gethostname(3) side has
1291 * truncated hostname.
1292 */
1293 n = ni6_nametodns(hostname, hostnamelen, 0);
1294 if (!n || n->m_next || n->m_len == 0)
1295 goto bad;
1296 IP6_EXTHDR_GET(subj, char *, m,
1297 off + sizeof(struct icmp6_nodeinfo), subjlen);
1298 if (subj == NULL)
1299 goto bad;
1300 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1301 n->m_len)) {
1302 goto bad;
1303 }
1304 m_freem(n);
1305 n = NULL;
1306 break;
1307
1308 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1309 default:
1310 goto bad;
1311 }
1312 break;
1313 }
1314
1315 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1316 switch (qtype) {
1317 case NI_QTYPE_FQDN:
| 1226 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1227 "a temporary address in %s:%d",
1228 __FILE__, __LINE__));
1229 goto bad;
1230 }
1231 }
1232
1233 /* validate query Subject field. */
1234 qtype = ntohs(ni6->ni_qtype);
1235 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1236 switch (qtype) {
1237 case NI_QTYPE_NOOP:
1238 case NI_QTYPE_SUPTYPES:
1239 /* 07 draft */
1240 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1241 break;
1242 /* FALLTHROUGH */
1243 case NI_QTYPE_FQDN:
1244 case NI_QTYPE_NODEADDR:
1245 case NI_QTYPE_IPV4ADDR:
1246 switch (ni6->ni_code) {
1247 case ICMP6_NI_SUBJ_IPV6:
1248#if ICMP6_NI_SUBJ_IPV6 != 0
1249 case 0:
1250#endif
1251 /*
1252 * backward compatibility - try to accept 03 draft
1253 * format, where no Subject is present.
1254 */
1255 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1256 subjlen == 0) {
1257 oldfqdn++;
1258 break;
1259 }
1260#if ICMP6_NI_SUBJ_IPV6 != 0
1261 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1262 goto bad;
1263#endif
1264
1265 if (subjlen != sizeof(struct in6_addr))
1266 goto bad;
1267
1268 /*
1269 * Validate Subject address.
1270 *
1271 * Not sure what exactly "address belongs to the node"
1272 * means in the spec, is it just unicast, or what?
1273 *
1274 * At this moment we consider Subject address as
1275 * "belong to the node" if the Subject address equals
1276 * to the IPv6 destination address; validation for
1277 * IPv6 destination address should have done enough
1278 * check for us.
1279 *
1280 * We do not do proxy at this moment.
1281 */
1282 /* m_pulldown instead of copy? */
1283 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1284 subjlen, (caddr_t)&in6_subj);
1285 if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL))
1286 goto bad;
1287
1288 subj = (char *)&in6_subj;
1289 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
1290 break;
1291
1292 /*
1293 * XXX if we are to allow other cases, we should really
1294 * be careful about scope here.
1295 * basically, we should disallow queries toward IPv6
1296 * destination X with subject Y,
1297 * if scope(X) > scope(Y).
1298 * if we allow scope(X) > scope(Y), it will result in
1299 * information leakage across scope boundary.
1300 */
1301 goto bad;
1302
1303 case ICMP6_NI_SUBJ_FQDN:
1304 /*
1305 * Validate Subject name with gethostname(3).
1306 *
1307 * The behavior may need some debate, since:
1308 * - we are not sure if the node has FQDN as
1309 * hostname (returned by gethostname(3)).
1310 * - the code does wildcard match for truncated names.
1311 * however, we are not sure if we want to perform
1312 * wildcard match, if gethostname(3) side has
1313 * truncated hostname.
1314 */
1315 n = ni6_nametodns(hostname, hostnamelen, 0);
1316 if (!n || n->m_next || n->m_len == 0)
1317 goto bad;
1318 IP6_EXTHDR_GET(subj, char *, m,
1319 off + sizeof(struct icmp6_nodeinfo), subjlen);
1320 if (subj == NULL)
1321 goto bad;
1322 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1323 n->m_len)) {
1324 goto bad;
1325 }
1326 m_freem(n);
1327 n = NULL;
1328 break;
1329
1330 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1331 default:
1332 goto bad;
1333 }
1334 break;
1335 }
1336
1337 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1338 switch (qtype) {
1339 case NI_QTYPE_FQDN:
|
1318 if ((icmp6_nodeinfo & 1) == 0)
| 1340 if ((icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0)
|
1319 goto bad;
1320 break;
1321 case NI_QTYPE_NODEADDR:
1322 case NI_QTYPE_IPV4ADDR:
| 1341 goto bad;
1342 break;
1343 case NI_QTYPE_NODEADDR:
1344 case NI_QTYPE_IPV4ADDR:
|
1323 if ((icmp6_nodeinfo & 2) == 0)
| 1345 if ((icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0)
|
1324 goto bad;
1325 break;
1326 }
1327
1328 /* guess reply length */
1329 switch (qtype) {
1330 case NI_QTYPE_NOOP:
1331 break; /* no reply data */
1332 case NI_QTYPE_SUPTYPES:
1333 replylen += sizeof(u_int32_t);
1334 break;
1335 case NI_QTYPE_FQDN:
1336 /* XXX will append an mbuf */
1337 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1338 break;
1339 case NI_QTYPE_NODEADDR:
1340 addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj);
1341 if ((replylen += addrs * (sizeof(struct in6_addr) +
1342 sizeof(u_int32_t))) > MCLBYTES)
1343 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1344 break;
1345 case NI_QTYPE_IPV4ADDR:
1346 /* unsupported - should respond with unknown Qtype? */
1347 break;
1348 default:
1349 /*
1350 * XXX: We must return a reply with the ICMP6 code
1351 * `unknown Qtype' in this case. However we regard the case
1352 * as an FQDN query for backward compatibility.
1353 * Older versions set a random value to this field,
1354 * so it rarely varies in the defined qtypes.
1355 * But the mechanism is not reliable...
1356 * maybe we should obsolete older versions.
1357 */
1358 qtype = NI_QTYPE_FQDN;
1359 /* XXX will append an mbuf */
1360 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1361 oldfqdn++;
1362 break;
1363 }
1364
1365 /* allocate an mbuf to reply. */
1366 MGETHDR(n, M_DONTWAIT, m->m_type);
1367 if (n == NULL) {
1368 m_freem(m);
1369 return (NULL);
1370 }
1371 M_MOVE_PKTHDR(n, m); /* just for recvif */
1372 if (replylen > MHLEN) {
1373 if (replylen > MCLBYTES) {
1374 /*
1375 * XXX: should we try to allocate more? But MCLBYTES
1376 * is probably much larger than IPV6_MMTU...
1377 */
1378 goto bad;
1379 }
1380 MCLGET(n, M_DONTWAIT);
1381 if ((n->m_flags & M_EXT) == 0) {
1382 goto bad;
1383 }
1384 }
1385 n->m_pkthdr.len = n->m_len = replylen;
1386
1387 /* copy mbuf header and IPv6 + Node Information base headers */
1388 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1389 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1390 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1391
1392 /* qtype dependent procedure */
1393 switch (qtype) {
1394 case NI_QTYPE_NOOP:
1395 nni6->ni_code = ICMP6_NI_SUCCESS;
1396 nni6->ni_flags = 0;
1397 break;
1398 case NI_QTYPE_SUPTYPES:
1399 {
1400 u_int32_t v;
1401 nni6->ni_code = ICMP6_NI_SUCCESS;
1402 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1403 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1404 v = (u_int32_t)htonl(0x0000000f);
1405 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1406 break;
1407 }
1408 case NI_QTYPE_FQDN:
1409 nni6->ni_code = ICMP6_NI_SUCCESS;
1410 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1411 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo));
1412 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1413 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1414 /*
1415 * XXX do we really have FQDN in variable "hostname"?
1416 */
1417 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1418 if (n->m_next == NULL)
1419 goto bad;
1420 /* XXX we assume that n->m_next is not a chain */
1421 if (n->m_next->m_next != NULL)
1422 goto bad;
1423 n->m_pkthdr.len += n->m_next->m_len;
1424 break;
1425 case NI_QTYPE_NODEADDR:
1426 {
1427 int lenlim, copied;
1428
1429 nni6->ni_code = ICMP6_NI_SUCCESS;
1430 n->m_pkthdr.len = n->m_len =
1431 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1432 lenlim = M_TRAILINGSPACE(n);
1433 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1434 /* XXX: reset mbuf length */
1435 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1436 sizeof(struct icmp6_nodeinfo) + copied;
1437 break;
1438 }
1439 default:
1440 break; /* XXX impossible! */
1441 }
1442
1443 nni6->ni_type = ICMP6_NI_REPLY;
1444 m_freem(m);
1445 return (n);
1446
1447 bad:
1448 m_freem(m);
1449 if (n)
1450 m_freem(n);
1451 return (NULL);
1452}
1453#undef hostnamelen
1454
1455/*
1456 * make a mbuf with DNS-encoded string. no compression support.
1457 *
1458 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1459 * treated as truncated name (two \0 at the end). this is a wild guess.
1460 */
1461static struct mbuf *
1462ni6_nametodns(name, namelen, old)
1463 const char *name;
1464 int namelen;
1465 int old; /* return pascal string if non-zero */
1466{
1467 struct mbuf *m;
1468 char *cp, *ep;
1469 const char *p, *q;
1470 int i, len, nterm;
1471
1472 if (old)
1473 len = namelen + 1;
1474 else
1475 len = MCLBYTES;
1476
1477 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1478 MGET(m, M_DONTWAIT, MT_DATA);
1479 if (m && len > MLEN) {
1480 MCLGET(m, M_DONTWAIT);
1481 if ((m->m_flags & M_EXT) == 0)
1482 goto fail;
1483 }
1484 if (!m)
1485 goto fail;
1486 m->m_next = NULL;
1487
1488 if (old) {
1489 m->m_len = len;
1490 *mtod(m, char *) = namelen;
1491 bcopy(name, mtod(m, char *) + 1, namelen);
1492 return m;
1493 } else {
1494 m->m_len = 0;
1495 cp = mtod(m, char *);
1496 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1497
1498 /* if not certain about my name, return empty buffer */
1499 if (namelen == 0)
1500 return m;
1501
1502 /*
1503 * guess if it looks like shortened hostname, or FQDN.
1504 * shortened hostname needs two trailing "\0".
1505 */
1506 i = 0;
1507 for (p = name; p < name + namelen; p++) {
1508 if (*p && *p == '.')
1509 i++;
1510 }
1511 if (i < 2)
1512 nterm = 2;
1513 else
1514 nterm = 1;
1515
1516 p = name;
1517 while (cp < ep && p < name + namelen) {
1518 i = 0;
1519 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1520 i++;
1521 /* result does not fit into mbuf */
1522 if (cp + i + 1 >= ep)
1523 goto fail;
1524 /*
1525 * DNS label length restriction, RFC1035 page 8.
1526 * "i == 0" case is included here to avoid returning
1527 * 0-length label on "foo..bar".
1528 */
1529 if (i <= 0 || i >= 64)
1530 goto fail;
1531 *cp++ = i;
1532 bcopy(p, cp, i);
1533 cp += i;
1534 p = q;
1535 if (p < name + namelen && *p == '.')
1536 p++;
1537 }
1538 /* termination */
1539 if (cp + nterm >= ep)
1540 goto fail;
1541 while (nterm-- > 0)
1542 *cp++ = '\0';
1543 m->m_len = cp - mtod(m, char *);
1544 return m;
1545 }
1546
1547 panic("should not reach here");
1548 /* NOTREACHED */
1549
1550 fail:
1551 if (m)
1552 m_freem(m);
1553 return NULL;
1554}
1555
1556/*
1557 * check if two DNS-encoded string matches. takes care of truncated
1558 * form (with \0\0 at the end). no compression support.
1559 * XXX upper/lowercase match (see RFC2065)
1560 */
1561static int
1562ni6_dnsmatch(a, alen, b, blen)
1563 const char *a;
1564 int alen;
1565 const char *b;
1566 int blen;
1567{
1568 const char *a0, *b0;
1569 int l;
1570
1571 /* simplest case - need validation? */
1572 if (alen == blen && bcmp(a, b, alen) == 0)
1573 return 1;
1574
1575 a0 = a;
1576 b0 = b;
1577
1578 /* termination is mandatory */
1579 if (alen < 2 || blen < 2)
1580 return 0;
1581 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1582 return 0;
1583 alen--;
1584 blen--;
1585
1586 while (a - a0 < alen && b - b0 < blen) {
1587 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1588 return 0;
1589
1590 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1591 return 0;
1592 /* we don't support compression yet */
1593 if (a[0] >= 64 || b[0] >= 64)
1594 return 0;
1595
1596 /* truncated case */
1597 if (a[0] == 0 && a - a0 == alen - 1)
1598 return 1;
1599 if (b[0] == 0 && b - b0 == blen - 1)
1600 return 1;
1601 if (a[0] == 0 || b[0] == 0)
1602 return 0;
1603
1604 if (a[0] != b[0])
1605 return 0;
1606 l = a[0];
1607 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1608 return 0;
1609 if (bcmp(a + 1, b + 1, l) != 0)
1610 return 0;
1611
1612 a += 1 + l;
1613 b += 1 + l;
1614 }
1615
1616 if (a - a0 == alen && b - b0 == blen)
1617 return 1;
1618 else
1619 return 0;
1620}
1621
1622/*
1623 * calculate the number of addresses to be returned in the node info reply.
1624 */
1625static int
1626ni6_addrs(ni6, m, ifpp, subj)
1627 struct icmp6_nodeinfo *ni6;
1628 struct mbuf *m;
1629 struct ifnet **ifpp;
1630 struct in6_addr *subj;
1631{
1632 struct ifnet *ifp;
1633 struct in6_ifaddr *ifa6;
1634 struct ifaddr *ifa;
1635 int addrs = 0, addrsofif, iffound = 0;
1636 int niflags = ni6->ni_flags;
1637
1638 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1639 switch (ni6->ni_code) {
1640 case ICMP6_NI_SUBJ_IPV6:
1641 if (subj == NULL) /* must be impossible... */
1642 return (0);
1643 break;
1644 default:
1645 /*
1646 * XXX: we only support IPv6 subject address for
1647 * this Qtype.
1648 */
1649 return (0);
1650 }
1651 }
1652
1653 IFNET_RLOCK();
1654 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
1655 addrsofif = 0;
1656 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1657 if (ifa->ifa_addr->sa_family != AF_INET6)
1658 continue;
1659 ifa6 = (struct in6_ifaddr *)ifa;
1660
1661 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1662 IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr))
1663 iffound = 1;
1664
1665 /*
1666 * IPv4-mapped addresses can only be returned by a
1667 * Node Information proxy, since they represent
1668 * addresses of IPv4-only nodes, which perforce do
1669 * not implement this protocol.
1670 * [icmp-name-lookups-07, Section 5.4]
1671 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1672 * this function at this moment.
1673 */
1674
1675 /* What do we have to do about ::1? */
1676 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1677 case IPV6_ADDR_SCOPE_LINKLOCAL:
1678 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1679 continue;
1680 break;
1681 case IPV6_ADDR_SCOPE_SITELOCAL:
1682 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1683 continue;
1684 break;
1685 case IPV6_ADDR_SCOPE_GLOBAL:
1686 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1687 continue;
1688 break;
1689 default:
1690 continue;
1691 }
1692
1693 /*
1694 * check if anycast is okay.
1695 * XXX: just experimental. not in the spec.
1696 */
1697 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1698 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1699 continue; /* we need only unicast addresses */
1700 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
| 1346 goto bad;
1347 break;
1348 }
1349
1350 /* guess reply length */
1351 switch (qtype) {
1352 case NI_QTYPE_NOOP:
1353 break; /* no reply data */
1354 case NI_QTYPE_SUPTYPES:
1355 replylen += sizeof(u_int32_t);
1356 break;
1357 case NI_QTYPE_FQDN:
1358 /* XXX will append an mbuf */
1359 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1360 break;
1361 case NI_QTYPE_NODEADDR:
1362 addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj);
1363 if ((replylen += addrs * (sizeof(struct in6_addr) +
1364 sizeof(u_int32_t))) > MCLBYTES)
1365 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1366 break;
1367 case NI_QTYPE_IPV4ADDR:
1368 /* unsupported - should respond with unknown Qtype? */
1369 break;
1370 default:
1371 /*
1372 * XXX: We must return a reply with the ICMP6 code
1373 * `unknown Qtype' in this case. However we regard the case
1374 * as an FQDN query for backward compatibility.
1375 * Older versions set a random value to this field,
1376 * so it rarely varies in the defined qtypes.
1377 * But the mechanism is not reliable...
1378 * maybe we should obsolete older versions.
1379 */
1380 qtype = NI_QTYPE_FQDN;
1381 /* XXX will append an mbuf */
1382 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1383 oldfqdn++;
1384 break;
1385 }
1386
1387 /* allocate an mbuf to reply. */
1388 MGETHDR(n, M_DONTWAIT, m->m_type);
1389 if (n == NULL) {
1390 m_freem(m);
1391 return (NULL);
1392 }
1393 M_MOVE_PKTHDR(n, m); /* just for recvif */
1394 if (replylen > MHLEN) {
1395 if (replylen > MCLBYTES) {
1396 /*
1397 * XXX: should we try to allocate more? But MCLBYTES
1398 * is probably much larger than IPV6_MMTU...
1399 */
1400 goto bad;
1401 }
1402 MCLGET(n, M_DONTWAIT);
1403 if ((n->m_flags & M_EXT) == 0) {
1404 goto bad;
1405 }
1406 }
1407 n->m_pkthdr.len = n->m_len = replylen;
1408
1409 /* copy mbuf header and IPv6 + Node Information base headers */
1410 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1411 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1412 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1413
1414 /* qtype dependent procedure */
1415 switch (qtype) {
1416 case NI_QTYPE_NOOP:
1417 nni6->ni_code = ICMP6_NI_SUCCESS;
1418 nni6->ni_flags = 0;
1419 break;
1420 case NI_QTYPE_SUPTYPES:
1421 {
1422 u_int32_t v;
1423 nni6->ni_code = ICMP6_NI_SUCCESS;
1424 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1425 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1426 v = (u_int32_t)htonl(0x0000000f);
1427 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1428 break;
1429 }
1430 case NI_QTYPE_FQDN:
1431 nni6->ni_code = ICMP6_NI_SUCCESS;
1432 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1433 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo));
1434 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1435 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1436 /*
1437 * XXX do we really have FQDN in variable "hostname"?
1438 */
1439 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1440 if (n->m_next == NULL)
1441 goto bad;
1442 /* XXX we assume that n->m_next is not a chain */
1443 if (n->m_next->m_next != NULL)
1444 goto bad;
1445 n->m_pkthdr.len += n->m_next->m_len;
1446 break;
1447 case NI_QTYPE_NODEADDR:
1448 {
1449 int lenlim, copied;
1450
1451 nni6->ni_code = ICMP6_NI_SUCCESS;
1452 n->m_pkthdr.len = n->m_len =
1453 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1454 lenlim = M_TRAILINGSPACE(n);
1455 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1456 /* XXX: reset mbuf length */
1457 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1458 sizeof(struct icmp6_nodeinfo) + copied;
1459 break;
1460 }
1461 default:
1462 break; /* XXX impossible! */
1463 }
1464
1465 nni6->ni_type = ICMP6_NI_REPLY;
1466 m_freem(m);
1467 return (n);
1468
1469 bad:
1470 m_freem(m);
1471 if (n)
1472 m_freem(n);
1473 return (NULL);
1474}
1475#undef hostnamelen
1476
1477/*
1478 * make a mbuf with DNS-encoded string. no compression support.
1479 *
1480 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1481 * treated as truncated name (two \0 at the end). this is a wild guess.
1482 */
1483static struct mbuf *
1484ni6_nametodns(name, namelen, old)
1485 const char *name;
1486 int namelen;
1487 int old; /* return pascal string if non-zero */
1488{
1489 struct mbuf *m;
1490 char *cp, *ep;
1491 const char *p, *q;
1492 int i, len, nterm;
1493
1494 if (old)
1495 len = namelen + 1;
1496 else
1497 len = MCLBYTES;
1498
1499 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1500 MGET(m, M_DONTWAIT, MT_DATA);
1501 if (m && len > MLEN) {
1502 MCLGET(m, M_DONTWAIT);
1503 if ((m->m_flags & M_EXT) == 0)
1504 goto fail;
1505 }
1506 if (!m)
1507 goto fail;
1508 m->m_next = NULL;
1509
1510 if (old) {
1511 m->m_len = len;
1512 *mtod(m, char *) = namelen;
1513 bcopy(name, mtod(m, char *) + 1, namelen);
1514 return m;
1515 } else {
1516 m->m_len = 0;
1517 cp = mtod(m, char *);
1518 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1519
1520 /* if not certain about my name, return empty buffer */
1521 if (namelen == 0)
1522 return m;
1523
1524 /*
1525 * guess if it looks like shortened hostname, or FQDN.
1526 * shortened hostname needs two trailing "\0".
1527 */
1528 i = 0;
1529 for (p = name; p < name + namelen; p++) {
1530 if (*p && *p == '.')
1531 i++;
1532 }
1533 if (i < 2)
1534 nterm = 2;
1535 else
1536 nterm = 1;
1537
1538 p = name;
1539 while (cp < ep && p < name + namelen) {
1540 i = 0;
1541 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1542 i++;
1543 /* result does not fit into mbuf */
1544 if (cp + i + 1 >= ep)
1545 goto fail;
1546 /*
1547 * DNS label length restriction, RFC1035 page 8.
1548 * "i == 0" case is included here to avoid returning
1549 * 0-length label on "foo..bar".
1550 */
1551 if (i <= 0 || i >= 64)
1552 goto fail;
1553 *cp++ = i;
1554 bcopy(p, cp, i);
1555 cp += i;
1556 p = q;
1557 if (p < name + namelen && *p == '.')
1558 p++;
1559 }
1560 /* termination */
1561 if (cp + nterm >= ep)
1562 goto fail;
1563 while (nterm-- > 0)
1564 *cp++ = '\0';
1565 m->m_len = cp - mtod(m, char *);
1566 return m;
1567 }
1568
1569 panic("should not reach here");
1570 /* NOTREACHED */
1571
1572 fail:
1573 if (m)
1574 m_freem(m);
1575 return NULL;
1576}
1577
1578/*
1579 * check if two DNS-encoded string matches. takes care of truncated
1580 * form (with \0\0 at the end). no compression support.
1581 * XXX upper/lowercase match (see RFC2065)
1582 */
1583static int
1584ni6_dnsmatch(a, alen, b, blen)
1585 const char *a;
1586 int alen;
1587 const char *b;
1588 int blen;
1589{
1590 const char *a0, *b0;
1591 int l;
1592
1593 /* simplest case - need validation? */
1594 if (alen == blen && bcmp(a, b, alen) == 0)
1595 return 1;
1596
1597 a0 = a;
1598 b0 = b;
1599
1600 /* termination is mandatory */
1601 if (alen < 2 || blen < 2)
1602 return 0;
1603 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1604 return 0;
1605 alen--;
1606 blen--;
1607
1608 while (a - a0 < alen && b - b0 < blen) {
1609 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1610 return 0;
1611
1612 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1613 return 0;
1614 /* we don't support compression yet */
1615 if (a[0] >= 64 || b[0] >= 64)
1616 return 0;
1617
1618 /* truncated case */
1619 if (a[0] == 0 && a - a0 == alen - 1)
1620 return 1;
1621 if (b[0] == 0 && b - b0 == blen - 1)
1622 return 1;
1623 if (a[0] == 0 || b[0] == 0)
1624 return 0;
1625
1626 if (a[0] != b[0])
1627 return 0;
1628 l = a[0];
1629 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1630 return 0;
1631 if (bcmp(a + 1, b + 1, l) != 0)
1632 return 0;
1633
1634 a += 1 + l;
1635 b += 1 + l;
1636 }
1637
1638 if (a - a0 == alen && b - b0 == blen)
1639 return 1;
1640 else
1641 return 0;
1642}
1643
1644/*
1645 * calculate the number of addresses to be returned in the node info reply.
1646 */
1647static int
1648ni6_addrs(ni6, m, ifpp, subj)
1649 struct icmp6_nodeinfo *ni6;
1650 struct mbuf *m;
1651 struct ifnet **ifpp;
1652 struct in6_addr *subj;
1653{
1654 struct ifnet *ifp;
1655 struct in6_ifaddr *ifa6;
1656 struct ifaddr *ifa;
1657 int addrs = 0, addrsofif, iffound = 0;
1658 int niflags = ni6->ni_flags;
1659
1660 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1661 switch (ni6->ni_code) {
1662 case ICMP6_NI_SUBJ_IPV6:
1663 if (subj == NULL) /* must be impossible... */
1664 return (0);
1665 break;
1666 default:
1667 /*
1668 * XXX: we only support IPv6 subject address for
1669 * this Qtype.
1670 */
1671 return (0);
1672 }
1673 }
1674
1675 IFNET_RLOCK();
1676 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
1677 addrsofif = 0;
1678 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1679 if (ifa->ifa_addr->sa_family != AF_INET6)
1680 continue;
1681 ifa6 = (struct in6_ifaddr *)ifa;
1682
1683 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1684 IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr))
1685 iffound = 1;
1686
1687 /*
1688 * IPv4-mapped addresses can only be returned by a
1689 * Node Information proxy, since they represent
1690 * addresses of IPv4-only nodes, which perforce do
1691 * not implement this protocol.
1692 * [icmp-name-lookups-07, Section 5.4]
1693 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1694 * this function at this moment.
1695 */
1696
1697 /* What do we have to do about ::1? */
1698 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1699 case IPV6_ADDR_SCOPE_LINKLOCAL:
1700 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1701 continue;
1702 break;
1703 case IPV6_ADDR_SCOPE_SITELOCAL:
1704 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1705 continue;
1706 break;
1707 case IPV6_ADDR_SCOPE_GLOBAL:
1708 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1709 continue;
1710 break;
1711 default:
1712 continue;
1713 }
1714
1715 /*
1716 * check if anycast is okay.
1717 * XXX: just experimental. not in the spec.
1718 */
1719 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1720 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1721 continue; /* we need only unicast addresses */
1722 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
|
1701 (icmp6_nodeinfo & 4) == 0) {
| 1723 (icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
|
1702 continue;
1703 }
1704 addrsofif++; /* count the address */
1705 }
1706 if (iffound) {
1707 *ifpp = ifp;
1708 IFNET_RUNLOCK();
1709 return (addrsofif);
1710 }
1711
1712 addrs += addrsofif;
1713 }
1714 IFNET_RUNLOCK();
1715
1716 return (addrs);
1717}
1718
1719static int
1720ni6_store_addrs(ni6, nni6, ifp0, resid)
1721 struct icmp6_nodeinfo *ni6, *nni6;
1722 struct ifnet *ifp0;
1723 int resid;
1724{
1725 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet);
1726 struct in6_ifaddr *ifa6;
1727 struct ifaddr *ifa;
1728 struct ifnet *ifp_dep = NULL;
1729 int copied = 0, allow_deprecated = 0;
1730 u_char *cp = (u_char *)(nni6 + 1);
1731 int niflags = ni6->ni_flags;
1732 u_int32_t ltime;
1733
1734 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1735 return (0); /* needless to copy */
1736
1737 IFNET_RLOCK();
1738 again:
1739
1740 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
1741 for (ifa = ifp->if_addrlist.tqh_first; ifa;
1742 ifa = ifa->ifa_list.tqe_next) {
1743 if (ifa->ifa_addr->sa_family != AF_INET6)
1744 continue;
1745 ifa6 = (struct in6_ifaddr *)ifa;
1746
1747 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
1748 allow_deprecated == 0) {
1749 /*
1750 * prefererred address should be put before
1751 * deprecated addresses.
1752 */
1753
1754 /* record the interface for later search */
1755 if (ifp_dep == NULL)
1756 ifp_dep = ifp;
1757
1758 continue;
1759 } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
1760 allow_deprecated != 0)
1761 continue; /* we now collect deprecated addrs */
1762
1763 /* What do we have to do about ::1? */
1764 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1765 case IPV6_ADDR_SCOPE_LINKLOCAL:
1766 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1767 continue;
1768 break;
1769 case IPV6_ADDR_SCOPE_SITELOCAL:
1770 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1771 continue;
1772 break;
1773 case IPV6_ADDR_SCOPE_GLOBAL:
1774 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1775 continue;
1776 break;
1777 default:
1778 continue;
1779 }
1780
1781 /*
1782 * check if anycast is okay.
1783 * XXX: just experimental. not in the spec.
1784 */
1785 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1786 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1787 continue;
1788 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
| 1724 continue;
1725 }
1726 addrsofif++; /* count the address */
1727 }
1728 if (iffound) {
1729 *ifpp = ifp;
1730 IFNET_RUNLOCK();
1731 return (addrsofif);
1732 }
1733
1734 addrs += addrsofif;
1735 }
1736 IFNET_RUNLOCK();
1737
1738 return (addrs);
1739}
1740
1741static int
1742ni6_store_addrs(ni6, nni6, ifp0, resid)
1743 struct icmp6_nodeinfo *ni6, *nni6;
1744 struct ifnet *ifp0;
1745 int resid;
1746{
1747 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet);
1748 struct in6_ifaddr *ifa6;
1749 struct ifaddr *ifa;
1750 struct ifnet *ifp_dep = NULL;
1751 int copied = 0, allow_deprecated = 0;
1752 u_char *cp = (u_char *)(nni6 + 1);
1753 int niflags = ni6->ni_flags;
1754 u_int32_t ltime;
1755
1756 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1757 return (0); /* needless to copy */
1758
1759 IFNET_RLOCK();
1760 again:
1761
1762 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
1763 for (ifa = ifp->if_addrlist.tqh_first; ifa;
1764 ifa = ifa->ifa_list.tqe_next) {
1765 if (ifa->ifa_addr->sa_family != AF_INET6)
1766 continue;
1767 ifa6 = (struct in6_ifaddr *)ifa;
1768
1769 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
1770 allow_deprecated == 0) {
1771 /*
1772 * prefererred address should be put before
1773 * deprecated addresses.
1774 */
1775
1776 /* record the interface for later search */
1777 if (ifp_dep == NULL)
1778 ifp_dep = ifp;
1779
1780 continue;
1781 } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
1782 allow_deprecated != 0)
1783 continue; /* we now collect deprecated addrs */
1784
1785 /* What do we have to do about ::1? */
1786 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1787 case IPV6_ADDR_SCOPE_LINKLOCAL:
1788 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1789 continue;
1790 break;
1791 case IPV6_ADDR_SCOPE_SITELOCAL:
1792 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1793 continue;
1794 break;
1795 case IPV6_ADDR_SCOPE_GLOBAL:
1796 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1797 continue;
1798 break;
1799 default:
1800 continue;
1801 }
1802
1803 /*
1804 * check if anycast is okay.
1805 * XXX: just experimental. not in the spec.
1806 */
1807 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1808 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1809 continue;
1810 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
|
1789 (icmp6_nodeinfo & 4) == 0) {
| 1811 (icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
|
1790 continue;
1791 }
1792
1793 /* now we can copy the address */
1794 if (resid < sizeof(struct in6_addr) +
1795 sizeof(u_int32_t)) {
1796 /*
1797 * We give up much more copy.
1798 * Set the truncate flag and return.
1799 */
1800 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE;
1801 IFNET_RUNLOCK();
1802 return (copied);
1803 }
1804
1805 /*
1806 * Set the TTL of the address.
1807 * The TTL value should be one of the following
1808 * according to the specification:
1809 *
1810 * 1. The remaining lifetime of a DHCP lease on the
1811 * address, or
1812 * 2. The remaining Valid Lifetime of a prefix from
1813 * which the address was derived through Stateless
1814 * Autoconfiguration.
1815 *
1816 * Note that we currently do not support stateful
1817 * address configuration by DHCPv6, so the former
1818 * case can't happen.
1819 */
1820 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1821 ltime = ND6_INFINITE_LIFETIME;
1822 else {
1823 if (ifa6->ia6_lifetime.ia6t_expire >
1824 time_second)
1825 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second);
1826 else
1827 ltime = 0;
1828 }
1829
1830 bcopy(<ime, cp, sizeof(u_int32_t));
1831 cp += sizeof(u_int32_t);
1832
1833 /* copy the address itself */
1834 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1835 sizeof(struct in6_addr));
1836 in6_clearscope((struct in6_addr *)cp); /* XXX */
1837 cp += sizeof(struct in6_addr);
1838
1839 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1840 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t));
1841 }
1842 if (ifp0) /* we need search only on the specified IF */
1843 break;
1844 }
1845
1846 if (allow_deprecated == 0 && ifp_dep != NULL) {
1847 ifp = ifp_dep;
1848 allow_deprecated = 1;
1849
1850 goto again;
1851 }
1852
1853 IFNET_RUNLOCK();
1854
1855 return (copied);
1856}
1857
1858/*
1859 * XXX almost dup'ed code with rip6_input.
1860 */
1861static int
1862icmp6_rip6_input(mp, off)
1863 struct mbuf **mp;
1864 int off;
1865{
1866 struct mbuf *m = *mp;
1867 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1868 struct in6pcb *in6p;
1869 struct in6pcb *last = NULL;
1870 struct sockaddr_in6 fromsa;
1871 struct icmp6_hdr *icmp6;
1872 struct mbuf *opts = NULL;
1873
1874#ifndef PULLDOWN_TEST
1875 /* this is assumed to be safe. */
1876 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1877#else
1878 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1879 if (icmp6 == NULL) {
1880 /* m is already reclaimed */
1881 return (IPPROTO_DONE);
1882 }
1883#endif
1884
1885 /*
1886 * XXX: the address may have embedded scope zone ID, which should be
1887 * hidden from applications.
1888 */
1889 bzero(&fromsa, sizeof(fromsa));
1890 fromsa.sin6_family = AF_INET6;
1891 fromsa.sin6_len = sizeof(struct sockaddr_in6);
1892 fromsa.sin6_addr = ip6->ip6_src;
1893 if (sa6_recoverscope(&fromsa)) {
1894 m_freem(m);
1895 return (IPPROTO_DONE);
1896 }
1897
1898 INP_INFO_RLOCK(&ripcbinfo);
1899 LIST_FOREACH(in6p, &ripcb, inp_list) {
1900 INP_LOCK(in6p);
1901 if ((in6p->inp_vflag & INP_IPV6) == 0) {
1902 docontinue:
1903 INP_UNLOCK(in6p);
1904 continue;
1905 }
1906 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
1907 goto docontinue;
1908 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1909 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1910 goto docontinue;
1911 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1912 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1913 goto docontinue;
1914 if (in6p->in6p_icmp6filt
1915 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1916 in6p->in6p_icmp6filt))
1917 goto docontinue;
1918 if (last) {
1919 struct mbuf *n = NULL;
1920
1921 /*
1922 * Recent network drivers tend to allocate a single
1923 * mbuf cluster, rather than to make a couple of
1924 * mbufs without clusters. Also, since the IPv6 code
1925 * path tries to avoid m_pullup(), it is highly
1926 * probable that we still have an mbuf cluster here
1927 * even though the necessary length can be stored in an
1928 * mbuf's internal buffer.
1929 * Meanwhile, the default size of the receive socket
1930 * buffer for raw sockets is not so large. This means
1931 * the possibility of packet loss is relatively higher
1932 * than before. To avoid this scenario, we copy the
1933 * received data to a separate mbuf that does not use
1934 * a cluster, if possible.
1935 * XXX: it is better to copy the data after stripping
1936 * intermediate headers.
1937 */
1938 if ((m->m_flags & M_EXT) && m->m_next == NULL &&
1939 m->m_len <= MHLEN) {
1940 MGET(n, M_DONTWAIT, m->m_type);
1941 if (n != NULL) {
1942 if (m_dup_pkthdr(n, m, M_NOWAIT)) {
1943 bcopy(m->m_data, n->m_data,
1944 m->m_len);
1945 n->m_len = m->m_len;
1946 } else {
1947 m_free(n);
1948 n = NULL;
1949 }
1950 }
1951 }
1952 if (n != NULL ||
1953 (n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1954 if (last->in6p_flags & IN6P_CONTROLOPTS)
1955 ip6_savecontrol(last, n, &opts);
1956 /* strip intermediate headers */
1957 m_adj(n, off);
1958 SOCKBUF_LOCK(&last->in6p_socket->so_rcv);
1959 if (sbappendaddr_locked(
1960 &last->in6p_socket->so_rcv,
1961 (struct sockaddr *)&fromsa, n, opts)
1962 == 0) {
1963 /* should notify about lost packet */
1964 m_freem(n);
1965 if (opts) {
1966 m_freem(opts);
1967 }
1968 SOCKBUF_UNLOCK(
1969 &last->in6p_socket->so_rcv);
1970 } else
1971 sorwakeup_locked(last->in6p_socket);
1972 opts = NULL;
1973 }
1974 INP_UNLOCK(last);
1975 }
1976 last = in6p;
1977 }
1978 if (last) {
1979 if (last->in6p_flags & IN6P_CONTROLOPTS)
1980 ip6_savecontrol(last, m, &opts);
1981 /* strip intermediate headers */
1982 m_adj(m, off);
1983
1984 /* avoid using mbuf clusters if possible (see above) */
1985 if ((m->m_flags & M_EXT) && m->m_next == NULL &&
1986 m->m_len <= MHLEN) {
1987 struct mbuf *n;
1988
1989 MGET(n, M_DONTWAIT, m->m_type);
1990 if (n != NULL) {
1991 if (m_dup_pkthdr(n, m, M_NOWAIT)) {
1992 bcopy(m->m_data, n->m_data, m->m_len);
1993 n->m_len = m->m_len;
1994
1995 m_freem(m);
1996 m = n;
1997 } else {
1998 m_freem(n);
1999 n = NULL;
2000 }
2001 }
2002 }
2003 SOCKBUF_LOCK(&last->in6p_socket->so_rcv);
2004 if (sbappendaddr_locked(&last->in6p_socket->so_rcv,
2005 (struct sockaddr *)&fromsa, m, opts) == 0) {
2006 m_freem(m);
2007 if (opts)
2008 m_freem(opts);
2009 SOCKBUF_UNLOCK(&last->in6p_socket->so_rcv);
2010 } else
2011 sorwakeup_locked(last->in6p_socket);
2012 INP_UNLOCK(last);
2013 } else {
2014 m_freem(m);
2015 ip6stat.ip6s_delivered--;
2016 }
2017 INP_INFO_RUNLOCK(&ripcbinfo);
2018 return IPPROTO_DONE;
2019}
2020
2021/*
2022 * Reflect the ip6 packet back to the source.
2023 * OFF points to the icmp6 header, counted from the top of the mbuf.
2024 */
2025void
2026icmp6_reflect(m, off)
2027 struct mbuf *m;
2028 size_t off;
2029{
2030 struct ip6_hdr *ip6;
2031 struct icmp6_hdr *icmp6;
2032 struct in6_ifaddr *ia;
2033 int plen;
2034 int type, code;
2035 struct ifnet *outif = NULL;
2036 struct in6_addr origdst, *src = NULL;
2037
2038 /* too short to reflect */
2039 if (off < sizeof(struct ip6_hdr)) {
2040 nd6log((LOG_DEBUG,
2041 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2042 (u_long)off, (u_long)sizeof(struct ip6_hdr),
2043 __FILE__, __LINE__));
2044 goto bad;
2045 }
2046
2047 /*
2048 * If there are extra headers between IPv6 and ICMPv6, strip
2049 * off that header first.
2050 */
2051#ifdef DIAGNOSTIC
2052 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
2053 panic("assumption failed in icmp6_reflect");
2054#endif
2055 if (off > sizeof(struct ip6_hdr)) {
2056 size_t l;
2057 struct ip6_hdr nip6;
2058
2059 l = off - sizeof(struct ip6_hdr);
2060 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2061 m_adj(m, l);
2062 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2063 if (m->m_len < l) {
2064 if ((m = m_pullup(m, l)) == NULL)
2065 return;
2066 }
2067 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2068 } else /* off == sizeof(struct ip6_hdr) */ {
2069 size_t l;
2070 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2071 if (m->m_len < l) {
2072 if ((m = m_pullup(m, l)) == NULL)
2073 return;
2074 }
2075 }
2076 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
2077 ip6 = mtod(m, struct ip6_hdr *);
2078 ip6->ip6_nxt = IPPROTO_ICMPV6;
2079 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
2080 type = icmp6->icmp6_type; /* keep type for statistics */
2081 code = icmp6->icmp6_code; /* ditto. */
2082
2083 origdst = ip6->ip6_dst;
2084 /*
2085 * ip6_input() drops a packet if its src is multicast.
2086 * So, the src is never multicast.
2087 */
2088 ip6->ip6_dst = ip6->ip6_src;
2089
2090 /*
2091 * If the incoming packet was addressed directly to us (i.e. unicast),
2092 * use dst as the src for the reply.
2093 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
2094 * (for example) when we encounter an error while forwarding procedure
2095 * destined to a duplicated address of ours.
2096 * Note that ip6_getdstifaddr() may fail if we are in an error handling
2097 * procedure of an outgoing packet of our own, in which case we need
2098 * to search in the ifaddr list.
2099 */
2100 if (!IN6_IS_ADDR_MULTICAST(&origdst)) {
2101 if ((ia = ip6_getdstifaddr(m))) {
2102 if (!(ia->ia6_flags &
2103 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)))
2104 src = &ia->ia_addr.sin6_addr;
2105 } else {
2106 struct sockaddr_in6 d;
2107
2108 bzero(&d, sizeof(d));
2109 d.sin6_family = AF_INET6;
2110 d.sin6_len = sizeof(d);
2111 d.sin6_addr = origdst;
2112 ia = (struct in6_ifaddr *)
2113 ifa_ifwithaddr((struct sockaddr *)&d);
2114 if (ia &&
2115 !(ia->ia6_flags &
2116 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) {
2117 src = &ia->ia_addr.sin6_addr;
2118 }
2119 }
2120 }
2121
2122 if (src == NULL) {
2123 int e;
2124 struct sockaddr_in6 sin6;
2125 struct route_in6 ro;
2126
2127 /*
2128 * This case matches to multicasts, our anycast, or unicasts
2129 * that we do not own. Select a source address based on the
2130 * source address of the erroneous packet.
2131 */
2132 bzero(&sin6, sizeof(sin6));
2133 sin6.sin6_family = AF_INET6;
2134 sin6.sin6_len = sizeof(sin6);
2135 sin6.sin6_addr = ip6->ip6_dst; /* zone ID should be embedded */
2136
2137 bzero(&ro, sizeof(ro));
2138 src = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, &outif, &e);
2139 if (ro.ro_rt)
2140 RTFREE(ro.ro_rt); /* XXX: we could use this */
2141 if (src == NULL) {
2142 char ip6buf[INET6_ADDRSTRLEN];
2143 nd6log((LOG_DEBUG,
2144 "icmp6_reflect: source can't be determined: "
2145 "dst=%s, error=%d\n",
2146 ip6_sprintf(ip6buf, &sin6.sin6_addr), e));
2147 goto bad;
2148 }
2149 }
2150
2151 ip6->ip6_src = *src;
2152 ip6->ip6_flow = 0;
2153 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2154 ip6->ip6_vfc |= IPV6_VERSION;
2155 ip6->ip6_nxt = IPPROTO_ICMPV6;
2156 if (outif)
2157 ip6->ip6_hlim = ND_IFINFO(outif)->chlim;
2158 else if (m->m_pkthdr.rcvif) {
2159 /* XXX: This may not be the outgoing interface */
2160 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2161 } else
2162 ip6->ip6_hlim = ip6_defhlim;
2163
2164 icmp6->icmp6_cksum = 0;
2165 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2166 sizeof(struct ip6_hdr), plen);
2167
2168 /*
2169 * XXX option handling
2170 */
2171
2172 m->m_flags &= ~(M_BCAST|M_MCAST);
2173
2174 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2175 if (outif)
2176 icmp6_ifoutstat_inc(outif, type, code);
2177
2178 return;
2179
2180 bad:
2181 m_freem(m);
2182 return;
2183}
2184
2185void
2186icmp6_fasttimo()
2187{
2188
2189 return;
2190}
2191
2192static const char *
2193icmp6_redirect_diag(src6, dst6, tgt6)
2194 struct in6_addr *src6;
2195 struct in6_addr *dst6;
2196 struct in6_addr *tgt6;
2197{
2198 static char buf[1024];
2199 char ip6bufs[INET6_ADDRSTRLEN];
2200 char ip6bufd[INET6_ADDRSTRLEN];
2201 char ip6buft[INET6_ADDRSTRLEN];
2202 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2203 ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6),
2204 ip6_sprintf(ip6buft, tgt6));
2205 return buf;
2206}
2207
2208void
2209icmp6_redirect_input(m, off)
2210 struct mbuf *m;
2211 int off;
2212{
2213 struct ifnet *ifp = m->m_pkthdr.rcvif;
2214 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2215 struct nd_redirect *nd_rd;
2216 int icmp6len = ntohs(ip6->ip6_plen);
2217 char *lladdr = NULL;
2218 int lladdrlen = 0;
2219 u_char *redirhdr = NULL;
2220 int redirhdrlen = 0;
2221 struct rtentry *rt = NULL;
2222 int is_router;
2223 int is_onlink;
2224 struct in6_addr src6 = ip6->ip6_src;
2225 struct in6_addr redtgt6;
2226 struct in6_addr reddst6;
2227 union nd_opts ndopts;
2228 char ip6buf[INET6_ADDRSTRLEN];
2229
2230 if (!m || !ifp)
2231 return;
2232
2233 /* XXX if we are router, we don't update route by icmp6 redirect */
2234 if (ip6_forwarding)
2235 goto freeit;
2236 if (!icmp6_rediraccept)
2237 goto freeit;
2238
2239#ifndef PULLDOWN_TEST
2240 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2241 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2242#else
2243 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2244 if (nd_rd == NULL) {
2245 icmp6stat.icp6s_tooshort++;
2246 return;
2247 }
2248#endif
2249 redtgt6 = nd_rd->nd_rd_target;
2250 reddst6 = nd_rd->nd_rd_dst;
2251
2252 if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) ||
2253 in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) {
2254 goto freeit;
2255 }
2256
2257 /* validation */
2258 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2259 nd6log((LOG_ERR,
2260 "ICMP6 redirect sent from %s rejected; "
2261 "must be from linklocal\n",
2262 ip6_sprintf(ip6buf, &src6)));
2263 goto bad;
2264 }
2265 if (ip6->ip6_hlim != 255) {
2266 nd6log((LOG_ERR,
2267 "ICMP6 redirect sent from %s rejected; "
2268 "hlim=%d (must be 255)\n",
2269 ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim));
2270 goto bad;
2271 }
2272 {
2273 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2274 struct sockaddr_in6 sin6;
2275 struct in6_addr *gw6;
2276
2277 bzero(&sin6, sizeof(sin6));
2278 sin6.sin6_family = AF_INET6;
2279 sin6.sin6_len = sizeof(struct sockaddr_in6);
2280 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
2281 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
2282 if (rt) {
2283 if (rt->rt_gateway == NULL ||
2284 rt->rt_gateway->sa_family != AF_INET6) {
2285 nd6log((LOG_ERR,
2286 "ICMP6 redirect rejected; no route "
2287 "with inet6 gateway found for redirect dst: %s\n",
2288 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2289 RTFREE_LOCKED(rt);
2290 goto bad;
2291 }
2292
2293 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2294 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2295 nd6log((LOG_ERR,
2296 "ICMP6 redirect rejected; "
2297 "not equal to gw-for-src=%s (must be same): "
2298 "%s\n",
2299 ip6_sprintf(ip6buf, gw6),
2300 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2301 RTFREE_LOCKED(rt);
2302 goto bad;
2303 }
2304 } else {
2305 nd6log((LOG_ERR,
2306 "ICMP6 redirect rejected; "
2307 "no route found for redirect dst: %s\n",
2308 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2309 goto bad;
2310 }
2311 RTFREE_LOCKED(rt);
2312 rt = NULL;
2313 }
2314 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2315 nd6log((LOG_ERR,
2316 "ICMP6 redirect rejected; "
2317 "redirect dst must be unicast: %s\n",
2318 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2319 goto bad;
2320 }
2321
2322 is_router = is_onlink = 0;
2323 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2324 is_router = 1; /* router case */
2325 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2326 is_onlink = 1; /* on-link destination case */
2327 if (!is_router && !is_onlink) {
2328 nd6log((LOG_ERR,
2329 "ICMP6 redirect rejected; "
2330 "neither router case nor onlink case: %s\n",
2331 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2332 goto bad;
2333 }
2334 /* validation passed */
2335
2336 icmp6len -= sizeof(*nd_rd);
2337 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2338 if (nd6_options(&ndopts) < 0) {
2339 nd6log((LOG_INFO, "icmp6_redirect_input: "
2340 "invalid ND option, rejected: %s\n",
2341 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2342 /* nd6_options have incremented stats */
2343 goto freeit;
2344 }
2345
2346 if (ndopts.nd_opts_tgt_lladdr) {
2347 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2348 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2349 }
2350
2351 if (ndopts.nd_opts_rh) {
2352 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2353 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2354 }
2355
2356 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2357 nd6log((LOG_INFO,
2358 "icmp6_redirect_input: lladdrlen mismatch for %s "
2359 "(if %d, icmp6 packet %d): %s\n",
2360 ip6_sprintf(ip6buf, &redtgt6),
2361 ifp->if_addrlen, lladdrlen - 2,
2362 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2363 goto bad;
2364 }
2365
2366 /* RFC 2461 8.3 */
2367 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2368 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2369
2370 if (!is_onlink) { /* better router case. perform rtredirect. */
2371 /* perform rtredirect */
2372 struct sockaddr_in6 sdst;
2373 struct sockaddr_in6 sgw;
2374 struct sockaddr_in6 ssrc;
2375
2376 bzero(&sdst, sizeof(sdst));
2377 bzero(&sgw, sizeof(sgw));
2378 bzero(&ssrc, sizeof(ssrc));
2379 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2380 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2381 sizeof(struct sockaddr_in6);
2382 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2383 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2384 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2385 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
2386 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST,
2387 (struct sockaddr *)&ssrc);
2388 }
2389 /* finally update cached route in each socket via pfctlinput */
2390 {
2391 struct sockaddr_in6 sdst;
2392
2393 bzero(&sdst, sizeof(sdst));
2394 sdst.sin6_family = AF_INET6;
2395 sdst.sin6_len = sizeof(struct sockaddr_in6);
2396 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2397 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2398#if defined(IPSEC) || defined(FAST_IPSEC)
2399 key_sa_routechange((struct sockaddr *)&sdst);
2400#endif
2401 }
2402
2403 freeit:
2404 m_freem(m);
2405 return;
2406
2407 bad:
2408 icmp6stat.icp6s_badredirect++;
2409 m_freem(m);
2410}
2411
2412void
2413icmp6_redirect_output(m0, rt)
2414 struct mbuf *m0;
2415 struct rtentry *rt;
2416{
2417 struct ifnet *ifp; /* my outgoing interface */
2418 struct in6_addr *ifp_ll6;
2419 struct in6_addr *router_ll6;
2420 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2421 struct mbuf *m = NULL; /* newly allocated one */
2422 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2423 struct nd_redirect *nd_rd;
2424 size_t maxlen;
2425 u_char *p;
2426 struct ifnet *outif = NULL;
2427 struct sockaddr_in6 src_sa;
2428
2429 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2430
2431 /* if we are not router, we don't send icmp6 redirect */
2432 if (!ip6_forwarding)
2433 goto fail;
2434
2435 /* sanity check */
2436 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2437 goto fail;
2438
2439 /*
2440 * Address check:
2441 * the source address must identify a neighbor, and
2442 * the destination address must not be a multicast address
2443 * [RFC 2461, sec 8.2]
2444 */
2445 sip6 = mtod(m0, struct ip6_hdr *);
2446 bzero(&src_sa, sizeof(src_sa));
2447 src_sa.sin6_family = AF_INET6;
2448 src_sa.sin6_len = sizeof(src_sa);
2449 src_sa.sin6_addr = sip6->ip6_src;
2450 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2451 goto fail;
2452 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2453 goto fail; /* what should we do here? */
2454
2455 /* rate limit */
2456 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2457 goto fail;
2458
2459 /*
2460 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2461 * we almost always ask for an mbuf cluster for simplicity.
2462 * (MHLEN < IPV6_MMTU is almost always true)
2463 */
2464#if IPV6_MMTU >= MCLBYTES
2465# error assumption failed about IPV6_MMTU and MCLBYTES
2466#endif
2467 MGETHDR(m, M_DONTWAIT, MT_HEADER);
2468 if (m && IPV6_MMTU >= MHLEN)
2469 MCLGET(m, M_DONTWAIT);
2470 if (!m)
2471 goto fail;
2472 m->m_pkthdr.rcvif = NULL;
2473 m->m_len = 0;
2474 maxlen = M_TRAILINGSPACE(m);
2475 maxlen = min(IPV6_MMTU, maxlen);
2476 /* just for safety */
2477 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2478 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2479 goto fail;
2480 }
2481
2482 {
2483 /* get ip6 linklocal address for ifp(my outgoing interface). */
2484 struct in6_ifaddr *ia;
2485 if ((ia = in6ifa_ifpforlinklocal(ifp,
2486 IN6_IFF_NOTREADY|
2487 IN6_IFF_ANYCAST)) == NULL)
2488 goto fail;
2489 ifp_ll6 = &ia->ia_addr.sin6_addr;
2490 }
2491
2492 /* get ip6 linklocal address for the router. */
2493 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2494 struct sockaddr_in6 *sin6;
2495 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2496 router_ll6 = &sin6->sin6_addr;
2497 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2498 router_ll6 = (struct in6_addr *)NULL;
2499 } else
2500 router_ll6 = (struct in6_addr *)NULL;
2501
2502 /* ip6 */
2503 ip6 = mtod(m, struct ip6_hdr *);
2504 ip6->ip6_flow = 0;
2505 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2506 ip6->ip6_vfc |= IPV6_VERSION;
2507 /* ip6->ip6_plen will be set later */
2508 ip6->ip6_nxt = IPPROTO_ICMPV6;
2509 ip6->ip6_hlim = 255;
2510 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2511 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2512 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2513
2514 /* ND Redirect */
2515 nd_rd = (struct nd_redirect *)(ip6 + 1);
2516 nd_rd->nd_rd_type = ND_REDIRECT;
2517 nd_rd->nd_rd_code = 0;
2518 nd_rd->nd_rd_reserved = 0;
2519 if (rt->rt_flags & RTF_GATEWAY) {
2520 /*
2521 * nd_rd->nd_rd_target must be a link-local address in
2522 * better router cases.
2523 */
2524 if (!router_ll6)
2525 goto fail;
2526 bcopy(router_ll6, &nd_rd->nd_rd_target,
2527 sizeof(nd_rd->nd_rd_target));
2528 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2529 sizeof(nd_rd->nd_rd_dst));
2530 } else {
2531 /* make sure redtgt == reddst */
2532 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2533 sizeof(nd_rd->nd_rd_target));
2534 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2535 sizeof(nd_rd->nd_rd_dst));
2536 }
2537
2538 p = (u_char *)(nd_rd + 1);
2539
2540 if (!router_ll6)
2541 goto nolladdropt;
2542
2543 {
2544 /* target lladdr option */
2545 struct rtentry *rt_router = NULL;
2546 int len;
2547 struct sockaddr_dl *sdl;
2548 struct nd_opt_hdr *nd_opt;
2549 char *lladdr;
2550
2551 rt_router = nd6_lookup(router_ll6, 0, ifp);
2552 if (!rt_router)
2553 goto nolladdropt;
2554 len = sizeof(*nd_opt) + ifp->if_addrlen;
2555 len = (len + 7) & ~7; /* round by 8 */
2556 /* safety check */
2557 if (len + (p - (u_char *)ip6) > maxlen)
2558 goto nolladdropt;
2559 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2560 (rt_router->rt_flags & RTF_LLINFO) &&
2561 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2562 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
2563 sdl->sdl_alen) {
2564 nd_opt = (struct nd_opt_hdr *)p;
2565 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2566 nd_opt->nd_opt_len = len >> 3;
2567 lladdr = (char *)(nd_opt + 1);
2568 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2569 p += len;
2570 }
2571 }
2572nolladdropt:;
2573
2574 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2575
2576 /* just to be safe */
2577#ifdef M_DECRYPTED /*not openbsd*/
2578 if (m0->m_flags & M_DECRYPTED)
2579 goto noredhdropt;
2580#endif
2581 if (p - (u_char *)ip6 > maxlen)
2582 goto noredhdropt;
2583
2584 {
2585 /* redirected header option */
2586 int len;
2587 struct nd_opt_rd_hdr *nd_opt_rh;
2588
2589 /*
2590 * compute the maximum size for icmp6 redirect header option.
2591 * XXX room for auth header?
2592 */
2593 len = maxlen - (p - (u_char *)ip6);
2594 len &= ~7;
2595
2596 /* This is just for simplicity. */
2597 if (m0->m_pkthdr.len != m0->m_len) {
2598 if (m0->m_next) {
2599 m_freem(m0->m_next);
2600 m0->m_next = NULL;
2601 }
2602 m0->m_pkthdr.len = m0->m_len;
2603 }
2604
2605 /*
2606 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2607 * about padding/truncate rule for the original IP packet.
2608 * From the discussion on IPv6imp in Feb 1999,
2609 * the consensus was:
2610 * - "attach as much as possible" is the goal
2611 * - pad if not aligned (original size can be guessed by
2612 * original ip6 header)
2613 * Following code adds the padding if it is simple enough,
2614 * and truncates if not.
2615 */
2616 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2617 panic("assumption failed in %s:%d", __FILE__,
2618 __LINE__);
2619
2620 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2621 /* not enough room, truncate */
2622 m0->m_pkthdr.len = m0->m_len = len -
2623 sizeof(*nd_opt_rh);
2624 } else {
2625 /* enough room, pad or truncate */
2626 size_t extra;
2627
2628 extra = m0->m_pkthdr.len % 8;
2629 if (extra) {
2630 /* pad if easy enough, truncate if not */
2631 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2632 /* pad */
2633 m0->m_len += (8 - extra);
2634 m0->m_pkthdr.len += (8 - extra);
2635 } else {
2636 /* truncate */
2637 m0->m_pkthdr.len -= extra;
2638 m0->m_len -= extra;
2639 }
2640 }
2641 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2642 m0->m_pkthdr.len = m0->m_len = len -
2643 sizeof(*nd_opt_rh);
2644 }
2645
2646 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2647 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2648 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2649 nd_opt_rh->nd_opt_rh_len = len >> 3;
2650 p += sizeof(*nd_opt_rh);
2651 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2652
2653 /* connect m0 to m */
2654 m_tag_delete_chain(m0, NULL);
2655 m0->m_flags &= ~M_PKTHDR;
2656 m->m_next = m0;
2657 m->m_pkthdr.len = m->m_len + m0->m_len;
2658 m0 = NULL;
2659 }
2660noredhdropt:;
2661 if (m0) {
2662 m_freem(m0);
2663 m0 = NULL;
2664 }
2665
2666 /* XXX: clear embedded link IDs in the inner header */
2667 in6_clearscope(&sip6->ip6_src);
2668 in6_clearscope(&sip6->ip6_dst);
2669 in6_clearscope(&nd_rd->nd_rd_target);
2670 in6_clearscope(&nd_rd->nd_rd_dst);
2671
2672 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2673
2674 nd_rd->nd_rd_cksum = 0;
2675 nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2676 sizeof(*ip6), ntohs(ip6->ip6_plen));
2677
2678 /* send the packet to outside... */
2679 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2680 if (outif) {
2681 icmp6_ifstat_inc(outif, ifs6_out_msg);
2682 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2683 }
2684 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2685
2686 return;
2687
2688fail:
2689 if (m)
2690 m_freem(m);
2691 if (m0)
2692 m_freem(m0);
2693}
2694
2695/*
2696 * ICMPv6 socket option processing.
2697 */
2698int
2699icmp6_ctloutput(so, sopt)
2700 struct socket *so;
2701 struct sockopt *sopt;
2702{
2703 int error = 0;
2704 int optlen;
2705 struct inpcb *inp = sotoinpcb(so);
2706 int level, op, optname;
2707
2708 if (sopt) {
2709 level = sopt->sopt_level;
2710 op = sopt->sopt_dir;
2711 optname = sopt->sopt_name;
2712 optlen = sopt->sopt_valsize;
2713 } else
2714 level = op = optname = optlen = 0;
2715
2716 if (level != IPPROTO_ICMPV6) {
2717 return EINVAL;
2718 }
2719
2720 switch (op) {
2721 case PRCO_SETOPT:
2722 switch (optname) {
2723 case ICMP6_FILTER:
2724 {
2725 struct icmp6_filter *p;
2726
2727 if (optlen != sizeof(*p)) {
2728 error = EMSGSIZE;
2729 break;
2730 }
2731 if (inp->in6p_icmp6filt == NULL) {
2732 error = EINVAL;
2733 break;
2734 }
2735 error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen,
2736 optlen);
2737 break;
2738 }
2739
2740 default:
2741 error = ENOPROTOOPT;
2742 break;
2743 }
2744 break;
2745
2746 case PRCO_GETOPT:
2747 switch (optname) {
2748 case ICMP6_FILTER:
2749 {
2750 if (inp->in6p_icmp6filt == NULL) {
2751 error = EINVAL;
2752 break;
2753 }
2754 error = sooptcopyout(sopt, inp->in6p_icmp6filt,
2755 sizeof(struct icmp6_filter));
2756 break;
2757 }
2758
2759 default:
2760 error = ENOPROTOOPT;
2761 break;
2762 }
2763 break;
2764 }
2765
2766 return (error);
2767}
2768
2769/*
2770 * Perform rate limit check.
2771 * Returns 0 if it is okay to send the icmp6 packet.
2772 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2773 * limitation.
2774 *
2775 * XXX per-destination/type check necessary?
2776 */
2777static int
2778icmp6_ratelimit(dst, type, code)
2779 const struct in6_addr *dst; /* not used at this moment */
2780 const int type; /* not used at this moment */
2781 const int code; /* not used at this moment */
2782{
2783 int ret;
2784
2785 ret = 0; /* okay to send */
2786
2787 /* PPS limit */
2788 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2789 icmp6errppslim)) {
2790 /* The packet is subject to rate limit */
2791 ret++;
2792 }
2793
2794 return ret;
2795}
| 1812 continue;
1813 }
1814
1815 /* now we can copy the address */
1816 if (resid < sizeof(struct in6_addr) +
1817 sizeof(u_int32_t)) {
1818 /*
1819 * We give up much more copy.
1820 * Set the truncate flag and return.
1821 */
1822 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE;
1823 IFNET_RUNLOCK();
1824 return (copied);
1825 }
1826
1827 /*
1828 * Set the TTL of the address.
1829 * The TTL value should be one of the following
1830 * according to the specification:
1831 *
1832 * 1. The remaining lifetime of a DHCP lease on the
1833 * address, or
1834 * 2. The remaining Valid Lifetime of a prefix from
1835 * which the address was derived through Stateless
1836 * Autoconfiguration.
1837 *
1838 * Note that we currently do not support stateful
1839 * address configuration by DHCPv6, so the former
1840 * case can't happen.
1841 */
1842 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1843 ltime = ND6_INFINITE_LIFETIME;
1844 else {
1845 if (ifa6->ia6_lifetime.ia6t_expire >
1846 time_second)
1847 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second);
1848 else
1849 ltime = 0;
1850 }
1851
1852 bcopy(<ime, cp, sizeof(u_int32_t));
1853 cp += sizeof(u_int32_t);
1854
1855 /* copy the address itself */
1856 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1857 sizeof(struct in6_addr));
1858 in6_clearscope((struct in6_addr *)cp); /* XXX */
1859 cp += sizeof(struct in6_addr);
1860
1861 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1862 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t));
1863 }
1864 if (ifp0) /* we need search only on the specified IF */
1865 break;
1866 }
1867
1868 if (allow_deprecated == 0 && ifp_dep != NULL) {
1869 ifp = ifp_dep;
1870 allow_deprecated = 1;
1871
1872 goto again;
1873 }
1874
1875 IFNET_RUNLOCK();
1876
1877 return (copied);
1878}
1879
1880/*
1881 * XXX almost dup'ed code with rip6_input.
1882 */
1883static int
1884icmp6_rip6_input(mp, off)
1885 struct mbuf **mp;
1886 int off;
1887{
1888 struct mbuf *m = *mp;
1889 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1890 struct in6pcb *in6p;
1891 struct in6pcb *last = NULL;
1892 struct sockaddr_in6 fromsa;
1893 struct icmp6_hdr *icmp6;
1894 struct mbuf *opts = NULL;
1895
1896#ifndef PULLDOWN_TEST
1897 /* this is assumed to be safe. */
1898 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1899#else
1900 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1901 if (icmp6 == NULL) {
1902 /* m is already reclaimed */
1903 return (IPPROTO_DONE);
1904 }
1905#endif
1906
1907 /*
1908 * XXX: the address may have embedded scope zone ID, which should be
1909 * hidden from applications.
1910 */
1911 bzero(&fromsa, sizeof(fromsa));
1912 fromsa.sin6_family = AF_INET6;
1913 fromsa.sin6_len = sizeof(struct sockaddr_in6);
1914 fromsa.sin6_addr = ip6->ip6_src;
1915 if (sa6_recoverscope(&fromsa)) {
1916 m_freem(m);
1917 return (IPPROTO_DONE);
1918 }
1919
1920 INP_INFO_RLOCK(&ripcbinfo);
1921 LIST_FOREACH(in6p, &ripcb, inp_list) {
1922 INP_LOCK(in6p);
1923 if ((in6p->inp_vflag & INP_IPV6) == 0) {
1924 docontinue:
1925 INP_UNLOCK(in6p);
1926 continue;
1927 }
1928 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
1929 goto docontinue;
1930 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1931 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1932 goto docontinue;
1933 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1934 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1935 goto docontinue;
1936 if (in6p->in6p_icmp6filt
1937 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1938 in6p->in6p_icmp6filt))
1939 goto docontinue;
1940 if (last) {
1941 struct mbuf *n = NULL;
1942
1943 /*
1944 * Recent network drivers tend to allocate a single
1945 * mbuf cluster, rather than to make a couple of
1946 * mbufs without clusters. Also, since the IPv6 code
1947 * path tries to avoid m_pullup(), it is highly
1948 * probable that we still have an mbuf cluster here
1949 * even though the necessary length can be stored in an
1950 * mbuf's internal buffer.
1951 * Meanwhile, the default size of the receive socket
1952 * buffer for raw sockets is not so large. This means
1953 * the possibility of packet loss is relatively higher
1954 * than before. To avoid this scenario, we copy the
1955 * received data to a separate mbuf that does not use
1956 * a cluster, if possible.
1957 * XXX: it is better to copy the data after stripping
1958 * intermediate headers.
1959 */
1960 if ((m->m_flags & M_EXT) && m->m_next == NULL &&
1961 m->m_len <= MHLEN) {
1962 MGET(n, M_DONTWAIT, m->m_type);
1963 if (n != NULL) {
1964 if (m_dup_pkthdr(n, m, M_NOWAIT)) {
1965 bcopy(m->m_data, n->m_data,
1966 m->m_len);
1967 n->m_len = m->m_len;
1968 } else {
1969 m_free(n);
1970 n = NULL;
1971 }
1972 }
1973 }
1974 if (n != NULL ||
1975 (n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1976 if (last->in6p_flags & IN6P_CONTROLOPTS)
1977 ip6_savecontrol(last, n, &opts);
1978 /* strip intermediate headers */
1979 m_adj(n, off);
1980 SOCKBUF_LOCK(&last->in6p_socket->so_rcv);
1981 if (sbappendaddr_locked(
1982 &last->in6p_socket->so_rcv,
1983 (struct sockaddr *)&fromsa, n, opts)
1984 == 0) {
1985 /* should notify about lost packet */
1986 m_freem(n);
1987 if (opts) {
1988 m_freem(opts);
1989 }
1990 SOCKBUF_UNLOCK(
1991 &last->in6p_socket->so_rcv);
1992 } else
1993 sorwakeup_locked(last->in6p_socket);
1994 opts = NULL;
1995 }
1996 INP_UNLOCK(last);
1997 }
1998 last = in6p;
1999 }
2000 if (last) {
2001 if (last->in6p_flags & IN6P_CONTROLOPTS)
2002 ip6_savecontrol(last, m, &opts);
2003 /* strip intermediate headers */
2004 m_adj(m, off);
2005
2006 /* avoid using mbuf clusters if possible (see above) */
2007 if ((m->m_flags & M_EXT) && m->m_next == NULL &&
2008 m->m_len <= MHLEN) {
2009 struct mbuf *n;
2010
2011 MGET(n, M_DONTWAIT, m->m_type);
2012 if (n != NULL) {
2013 if (m_dup_pkthdr(n, m, M_NOWAIT)) {
2014 bcopy(m->m_data, n->m_data, m->m_len);
2015 n->m_len = m->m_len;
2016
2017 m_freem(m);
2018 m = n;
2019 } else {
2020 m_freem(n);
2021 n = NULL;
2022 }
2023 }
2024 }
2025 SOCKBUF_LOCK(&last->in6p_socket->so_rcv);
2026 if (sbappendaddr_locked(&last->in6p_socket->so_rcv,
2027 (struct sockaddr *)&fromsa, m, opts) == 0) {
2028 m_freem(m);
2029 if (opts)
2030 m_freem(opts);
2031 SOCKBUF_UNLOCK(&last->in6p_socket->so_rcv);
2032 } else
2033 sorwakeup_locked(last->in6p_socket);
2034 INP_UNLOCK(last);
2035 } else {
2036 m_freem(m);
2037 ip6stat.ip6s_delivered--;
2038 }
2039 INP_INFO_RUNLOCK(&ripcbinfo);
2040 return IPPROTO_DONE;
2041}
2042
2043/*
2044 * Reflect the ip6 packet back to the source.
2045 * OFF points to the icmp6 header, counted from the top of the mbuf.
2046 */
2047void
2048icmp6_reflect(m, off)
2049 struct mbuf *m;
2050 size_t off;
2051{
2052 struct ip6_hdr *ip6;
2053 struct icmp6_hdr *icmp6;
2054 struct in6_ifaddr *ia;
2055 int plen;
2056 int type, code;
2057 struct ifnet *outif = NULL;
2058 struct in6_addr origdst, *src = NULL;
2059
2060 /* too short to reflect */
2061 if (off < sizeof(struct ip6_hdr)) {
2062 nd6log((LOG_DEBUG,
2063 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2064 (u_long)off, (u_long)sizeof(struct ip6_hdr),
2065 __FILE__, __LINE__));
2066 goto bad;
2067 }
2068
2069 /*
2070 * If there are extra headers between IPv6 and ICMPv6, strip
2071 * off that header first.
2072 */
2073#ifdef DIAGNOSTIC
2074 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
2075 panic("assumption failed in icmp6_reflect");
2076#endif
2077 if (off > sizeof(struct ip6_hdr)) {
2078 size_t l;
2079 struct ip6_hdr nip6;
2080
2081 l = off - sizeof(struct ip6_hdr);
2082 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2083 m_adj(m, l);
2084 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2085 if (m->m_len < l) {
2086 if ((m = m_pullup(m, l)) == NULL)
2087 return;
2088 }
2089 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2090 } else /* off == sizeof(struct ip6_hdr) */ {
2091 size_t l;
2092 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2093 if (m->m_len < l) {
2094 if ((m = m_pullup(m, l)) == NULL)
2095 return;
2096 }
2097 }
2098 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
2099 ip6 = mtod(m, struct ip6_hdr *);
2100 ip6->ip6_nxt = IPPROTO_ICMPV6;
2101 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
2102 type = icmp6->icmp6_type; /* keep type for statistics */
2103 code = icmp6->icmp6_code; /* ditto. */
2104
2105 origdst = ip6->ip6_dst;
2106 /*
2107 * ip6_input() drops a packet if its src is multicast.
2108 * So, the src is never multicast.
2109 */
2110 ip6->ip6_dst = ip6->ip6_src;
2111
2112 /*
2113 * If the incoming packet was addressed directly to us (i.e. unicast),
2114 * use dst as the src for the reply.
2115 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
2116 * (for example) when we encounter an error while forwarding procedure
2117 * destined to a duplicated address of ours.
2118 * Note that ip6_getdstifaddr() may fail if we are in an error handling
2119 * procedure of an outgoing packet of our own, in which case we need
2120 * to search in the ifaddr list.
2121 */
2122 if (!IN6_IS_ADDR_MULTICAST(&origdst)) {
2123 if ((ia = ip6_getdstifaddr(m))) {
2124 if (!(ia->ia6_flags &
2125 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)))
2126 src = &ia->ia_addr.sin6_addr;
2127 } else {
2128 struct sockaddr_in6 d;
2129
2130 bzero(&d, sizeof(d));
2131 d.sin6_family = AF_INET6;
2132 d.sin6_len = sizeof(d);
2133 d.sin6_addr = origdst;
2134 ia = (struct in6_ifaddr *)
2135 ifa_ifwithaddr((struct sockaddr *)&d);
2136 if (ia &&
2137 !(ia->ia6_flags &
2138 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) {
2139 src = &ia->ia_addr.sin6_addr;
2140 }
2141 }
2142 }
2143
2144 if (src == NULL) {
2145 int e;
2146 struct sockaddr_in6 sin6;
2147 struct route_in6 ro;
2148
2149 /*
2150 * This case matches to multicasts, our anycast, or unicasts
2151 * that we do not own. Select a source address based on the
2152 * source address of the erroneous packet.
2153 */
2154 bzero(&sin6, sizeof(sin6));
2155 sin6.sin6_family = AF_INET6;
2156 sin6.sin6_len = sizeof(sin6);
2157 sin6.sin6_addr = ip6->ip6_dst; /* zone ID should be embedded */
2158
2159 bzero(&ro, sizeof(ro));
2160 src = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, &outif, &e);
2161 if (ro.ro_rt)
2162 RTFREE(ro.ro_rt); /* XXX: we could use this */
2163 if (src == NULL) {
2164 char ip6buf[INET6_ADDRSTRLEN];
2165 nd6log((LOG_DEBUG,
2166 "icmp6_reflect: source can't be determined: "
2167 "dst=%s, error=%d\n",
2168 ip6_sprintf(ip6buf, &sin6.sin6_addr), e));
2169 goto bad;
2170 }
2171 }
2172
2173 ip6->ip6_src = *src;
2174 ip6->ip6_flow = 0;
2175 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2176 ip6->ip6_vfc |= IPV6_VERSION;
2177 ip6->ip6_nxt = IPPROTO_ICMPV6;
2178 if (outif)
2179 ip6->ip6_hlim = ND_IFINFO(outif)->chlim;
2180 else if (m->m_pkthdr.rcvif) {
2181 /* XXX: This may not be the outgoing interface */
2182 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2183 } else
2184 ip6->ip6_hlim = ip6_defhlim;
2185
2186 icmp6->icmp6_cksum = 0;
2187 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2188 sizeof(struct ip6_hdr), plen);
2189
2190 /*
2191 * XXX option handling
2192 */
2193
2194 m->m_flags &= ~(M_BCAST|M_MCAST);
2195
2196 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2197 if (outif)
2198 icmp6_ifoutstat_inc(outif, type, code);
2199
2200 return;
2201
2202 bad:
2203 m_freem(m);
2204 return;
2205}
2206
2207void
2208icmp6_fasttimo()
2209{
2210
2211 return;
2212}
2213
2214static const char *
2215icmp6_redirect_diag(src6, dst6, tgt6)
2216 struct in6_addr *src6;
2217 struct in6_addr *dst6;
2218 struct in6_addr *tgt6;
2219{
2220 static char buf[1024];
2221 char ip6bufs[INET6_ADDRSTRLEN];
2222 char ip6bufd[INET6_ADDRSTRLEN];
2223 char ip6buft[INET6_ADDRSTRLEN];
2224 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2225 ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6),
2226 ip6_sprintf(ip6buft, tgt6));
2227 return buf;
2228}
2229
2230void
2231icmp6_redirect_input(m, off)
2232 struct mbuf *m;
2233 int off;
2234{
2235 struct ifnet *ifp = m->m_pkthdr.rcvif;
2236 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2237 struct nd_redirect *nd_rd;
2238 int icmp6len = ntohs(ip6->ip6_plen);
2239 char *lladdr = NULL;
2240 int lladdrlen = 0;
2241 u_char *redirhdr = NULL;
2242 int redirhdrlen = 0;
2243 struct rtentry *rt = NULL;
2244 int is_router;
2245 int is_onlink;
2246 struct in6_addr src6 = ip6->ip6_src;
2247 struct in6_addr redtgt6;
2248 struct in6_addr reddst6;
2249 union nd_opts ndopts;
2250 char ip6buf[INET6_ADDRSTRLEN];
2251
2252 if (!m || !ifp)
2253 return;
2254
2255 /* XXX if we are router, we don't update route by icmp6 redirect */
2256 if (ip6_forwarding)
2257 goto freeit;
2258 if (!icmp6_rediraccept)
2259 goto freeit;
2260
2261#ifndef PULLDOWN_TEST
2262 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2263 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2264#else
2265 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2266 if (nd_rd == NULL) {
2267 icmp6stat.icp6s_tooshort++;
2268 return;
2269 }
2270#endif
2271 redtgt6 = nd_rd->nd_rd_target;
2272 reddst6 = nd_rd->nd_rd_dst;
2273
2274 if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) ||
2275 in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) {
2276 goto freeit;
2277 }
2278
2279 /* validation */
2280 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2281 nd6log((LOG_ERR,
2282 "ICMP6 redirect sent from %s rejected; "
2283 "must be from linklocal\n",
2284 ip6_sprintf(ip6buf, &src6)));
2285 goto bad;
2286 }
2287 if (ip6->ip6_hlim != 255) {
2288 nd6log((LOG_ERR,
2289 "ICMP6 redirect sent from %s rejected; "
2290 "hlim=%d (must be 255)\n",
2291 ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim));
2292 goto bad;
2293 }
2294 {
2295 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2296 struct sockaddr_in6 sin6;
2297 struct in6_addr *gw6;
2298
2299 bzero(&sin6, sizeof(sin6));
2300 sin6.sin6_family = AF_INET6;
2301 sin6.sin6_len = sizeof(struct sockaddr_in6);
2302 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
2303 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
2304 if (rt) {
2305 if (rt->rt_gateway == NULL ||
2306 rt->rt_gateway->sa_family != AF_INET6) {
2307 nd6log((LOG_ERR,
2308 "ICMP6 redirect rejected; no route "
2309 "with inet6 gateway found for redirect dst: %s\n",
2310 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2311 RTFREE_LOCKED(rt);
2312 goto bad;
2313 }
2314
2315 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2316 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2317 nd6log((LOG_ERR,
2318 "ICMP6 redirect rejected; "
2319 "not equal to gw-for-src=%s (must be same): "
2320 "%s\n",
2321 ip6_sprintf(ip6buf, gw6),
2322 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2323 RTFREE_LOCKED(rt);
2324 goto bad;
2325 }
2326 } else {
2327 nd6log((LOG_ERR,
2328 "ICMP6 redirect rejected; "
2329 "no route found for redirect dst: %s\n",
2330 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2331 goto bad;
2332 }
2333 RTFREE_LOCKED(rt);
2334 rt = NULL;
2335 }
2336 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2337 nd6log((LOG_ERR,
2338 "ICMP6 redirect rejected; "
2339 "redirect dst must be unicast: %s\n",
2340 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2341 goto bad;
2342 }
2343
2344 is_router = is_onlink = 0;
2345 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2346 is_router = 1; /* router case */
2347 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2348 is_onlink = 1; /* on-link destination case */
2349 if (!is_router && !is_onlink) {
2350 nd6log((LOG_ERR,
2351 "ICMP6 redirect rejected; "
2352 "neither router case nor onlink case: %s\n",
2353 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2354 goto bad;
2355 }
2356 /* validation passed */
2357
2358 icmp6len -= sizeof(*nd_rd);
2359 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2360 if (nd6_options(&ndopts) < 0) {
2361 nd6log((LOG_INFO, "icmp6_redirect_input: "
2362 "invalid ND option, rejected: %s\n",
2363 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2364 /* nd6_options have incremented stats */
2365 goto freeit;
2366 }
2367
2368 if (ndopts.nd_opts_tgt_lladdr) {
2369 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2370 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2371 }
2372
2373 if (ndopts.nd_opts_rh) {
2374 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2375 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2376 }
2377
2378 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2379 nd6log((LOG_INFO,
2380 "icmp6_redirect_input: lladdrlen mismatch for %s "
2381 "(if %d, icmp6 packet %d): %s\n",
2382 ip6_sprintf(ip6buf, &redtgt6),
2383 ifp->if_addrlen, lladdrlen - 2,
2384 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2385 goto bad;
2386 }
2387
2388 /* RFC 2461 8.3 */
2389 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2390 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2391
2392 if (!is_onlink) { /* better router case. perform rtredirect. */
2393 /* perform rtredirect */
2394 struct sockaddr_in6 sdst;
2395 struct sockaddr_in6 sgw;
2396 struct sockaddr_in6 ssrc;
2397
2398 bzero(&sdst, sizeof(sdst));
2399 bzero(&sgw, sizeof(sgw));
2400 bzero(&ssrc, sizeof(ssrc));
2401 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2402 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2403 sizeof(struct sockaddr_in6);
2404 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2405 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2406 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2407 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
2408 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST,
2409 (struct sockaddr *)&ssrc);
2410 }
2411 /* finally update cached route in each socket via pfctlinput */
2412 {
2413 struct sockaddr_in6 sdst;
2414
2415 bzero(&sdst, sizeof(sdst));
2416 sdst.sin6_family = AF_INET6;
2417 sdst.sin6_len = sizeof(struct sockaddr_in6);
2418 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2419 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2420#if defined(IPSEC) || defined(FAST_IPSEC)
2421 key_sa_routechange((struct sockaddr *)&sdst);
2422#endif
2423 }
2424
2425 freeit:
2426 m_freem(m);
2427 return;
2428
2429 bad:
2430 icmp6stat.icp6s_badredirect++;
2431 m_freem(m);
2432}
2433
2434void
2435icmp6_redirect_output(m0, rt)
2436 struct mbuf *m0;
2437 struct rtentry *rt;
2438{
2439 struct ifnet *ifp; /* my outgoing interface */
2440 struct in6_addr *ifp_ll6;
2441 struct in6_addr *router_ll6;
2442 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2443 struct mbuf *m = NULL; /* newly allocated one */
2444 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2445 struct nd_redirect *nd_rd;
2446 size_t maxlen;
2447 u_char *p;
2448 struct ifnet *outif = NULL;
2449 struct sockaddr_in6 src_sa;
2450
2451 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2452
2453 /* if we are not router, we don't send icmp6 redirect */
2454 if (!ip6_forwarding)
2455 goto fail;
2456
2457 /* sanity check */
2458 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2459 goto fail;
2460
2461 /*
2462 * Address check:
2463 * the source address must identify a neighbor, and
2464 * the destination address must not be a multicast address
2465 * [RFC 2461, sec 8.2]
2466 */
2467 sip6 = mtod(m0, struct ip6_hdr *);
2468 bzero(&src_sa, sizeof(src_sa));
2469 src_sa.sin6_family = AF_INET6;
2470 src_sa.sin6_len = sizeof(src_sa);
2471 src_sa.sin6_addr = sip6->ip6_src;
2472 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2473 goto fail;
2474 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2475 goto fail; /* what should we do here? */
2476
2477 /* rate limit */
2478 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2479 goto fail;
2480
2481 /*
2482 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2483 * we almost always ask for an mbuf cluster for simplicity.
2484 * (MHLEN < IPV6_MMTU is almost always true)
2485 */
2486#if IPV6_MMTU >= MCLBYTES
2487# error assumption failed about IPV6_MMTU and MCLBYTES
2488#endif
2489 MGETHDR(m, M_DONTWAIT, MT_HEADER);
2490 if (m && IPV6_MMTU >= MHLEN)
2491 MCLGET(m, M_DONTWAIT);
2492 if (!m)
2493 goto fail;
2494 m->m_pkthdr.rcvif = NULL;
2495 m->m_len = 0;
2496 maxlen = M_TRAILINGSPACE(m);
2497 maxlen = min(IPV6_MMTU, maxlen);
2498 /* just for safety */
2499 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2500 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2501 goto fail;
2502 }
2503
2504 {
2505 /* get ip6 linklocal address for ifp(my outgoing interface). */
2506 struct in6_ifaddr *ia;
2507 if ((ia = in6ifa_ifpforlinklocal(ifp,
2508 IN6_IFF_NOTREADY|
2509 IN6_IFF_ANYCAST)) == NULL)
2510 goto fail;
2511 ifp_ll6 = &ia->ia_addr.sin6_addr;
2512 }
2513
2514 /* get ip6 linklocal address for the router. */
2515 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2516 struct sockaddr_in6 *sin6;
2517 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2518 router_ll6 = &sin6->sin6_addr;
2519 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2520 router_ll6 = (struct in6_addr *)NULL;
2521 } else
2522 router_ll6 = (struct in6_addr *)NULL;
2523
2524 /* ip6 */
2525 ip6 = mtod(m, struct ip6_hdr *);
2526 ip6->ip6_flow = 0;
2527 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2528 ip6->ip6_vfc |= IPV6_VERSION;
2529 /* ip6->ip6_plen will be set later */
2530 ip6->ip6_nxt = IPPROTO_ICMPV6;
2531 ip6->ip6_hlim = 255;
2532 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2533 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2534 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2535
2536 /* ND Redirect */
2537 nd_rd = (struct nd_redirect *)(ip6 + 1);
2538 nd_rd->nd_rd_type = ND_REDIRECT;
2539 nd_rd->nd_rd_code = 0;
2540 nd_rd->nd_rd_reserved = 0;
2541 if (rt->rt_flags & RTF_GATEWAY) {
2542 /*
2543 * nd_rd->nd_rd_target must be a link-local address in
2544 * better router cases.
2545 */
2546 if (!router_ll6)
2547 goto fail;
2548 bcopy(router_ll6, &nd_rd->nd_rd_target,
2549 sizeof(nd_rd->nd_rd_target));
2550 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2551 sizeof(nd_rd->nd_rd_dst));
2552 } else {
2553 /* make sure redtgt == reddst */
2554 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2555 sizeof(nd_rd->nd_rd_target));
2556 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2557 sizeof(nd_rd->nd_rd_dst));
2558 }
2559
2560 p = (u_char *)(nd_rd + 1);
2561
2562 if (!router_ll6)
2563 goto nolladdropt;
2564
2565 {
2566 /* target lladdr option */
2567 struct rtentry *rt_router = NULL;
2568 int len;
2569 struct sockaddr_dl *sdl;
2570 struct nd_opt_hdr *nd_opt;
2571 char *lladdr;
2572
2573 rt_router = nd6_lookup(router_ll6, 0, ifp);
2574 if (!rt_router)
2575 goto nolladdropt;
2576 len = sizeof(*nd_opt) + ifp->if_addrlen;
2577 len = (len + 7) & ~7; /* round by 8 */
2578 /* safety check */
2579 if (len + (p - (u_char *)ip6) > maxlen)
2580 goto nolladdropt;
2581 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2582 (rt_router->rt_flags & RTF_LLINFO) &&
2583 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2584 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
2585 sdl->sdl_alen) {
2586 nd_opt = (struct nd_opt_hdr *)p;
2587 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2588 nd_opt->nd_opt_len = len >> 3;
2589 lladdr = (char *)(nd_opt + 1);
2590 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2591 p += len;
2592 }
2593 }
2594nolladdropt:;
2595
2596 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2597
2598 /* just to be safe */
2599#ifdef M_DECRYPTED /*not openbsd*/
2600 if (m0->m_flags & M_DECRYPTED)
2601 goto noredhdropt;
2602#endif
2603 if (p - (u_char *)ip6 > maxlen)
2604 goto noredhdropt;
2605
2606 {
2607 /* redirected header option */
2608 int len;
2609 struct nd_opt_rd_hdr *nd_opt_rh;
2610
2611 /*
2612 * compute the maximum size for icmp6 redirect header option.
2613 * XXX room for auth header?
2614 */
2615 len = maxlen - (p - (u_char *)ip6);
2616 len &= ~7;
2617
2618 /* This is just for simplicity. */
2619 if (m0->m_pkthdr.len != m0->m_len) {
2620 if (m0->m_next) {
2621 m_freem(m0->m_next);
2622 m0->m_next = NULL;
2623 }
2624 m0->m_pkthdr.len = m0->m_len;
2625 }
2626
2627 /*
2628 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2629 * about padding/truncate rule for the original IP packet.
2630 * From the discussion on IPv6imp in Feb 1999,
2631 * the consensus was:
2632 * - "attach as much as possible" is the goal
2633 * - pad if not aligned (original size can be guessed by
2634 * original ip6 header)
2635 * Following code adds the padding if it is simple enough,
2636 * and truncates if not.
2637 */
2638 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2639 panic("assumption failed in %s:%d", __FILE__,
2640 __LINE__);
2641
2642 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2643 /* not enough room, truncate */
2644 m0->m_pkthdr.len = m0->m_len = len -
2645 sizeof(*nd_opt_rh);
2646 } else {
2647 /* enough room, pad or truncate */
2648 size_t extra;
2649
2650 extra = m0->m_pkthdr.len % 8;
2651 if (extra) {
2652 /* pad if easy enough, truncate if not */
2653 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2654 /* pad */
2655 m0->m_len += (8 - extra);
2656 m0->m_pkthdr.len += (8 - extra);
2657 } else {
2658 /* truncate */
2659 m0->m_pkthdr.len -= extra;
2660 m0->m_len -= extra;
2661 }
2662 }
2663 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2664 m0->m_pkthdr.len = m0->m_len = len -
2665 sizeof(*nd_opt_rh);
2666 }
2667
2668 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2669 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2670 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2671 nd_opt_rh->nd_opt_rh_len = len >> 3;
2672 p += sizeof(*nd_opt_rh);
2673 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2674
2675 /* connect m0 to m */
2676 m_tag_delete_chain(m0, NULL);
2677 m0->m_flags &= ~M_PKTHDR;
2678 m->m_next = m0;
2679 m->m_pkthdr.len = m->m_len + m0->m_len;
2680 m0 = NULL;
2681 }
2682noredhdropt:;
2683 if (m0) {
2684 m_freem(m0);
2685 m0 = NULL;
2686 }
2687
2688 /* XXX: clear embedded link IDs in the inner header */
2689 in6_clearscope(&sip6->ip6_src);
2690 in6_clearscope(&sip6->ip6_dst);
2691 in6_clearscope(&nd_rd->nd_rd_target);
2692 in6_clearscope(&nd_rd->nd_rd_dst);
2693
2694 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2695
2696 nd_rd->nd_rd_cksum = 0;
2697 nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2698 sizeof(*ip6), ntohs(ip6->ip6_plen));
2699
2700 /* send the packet to outside... */
2701 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2702 if (outif) {
2703 icmp6_ifstat_inc(outif, ifs6_out_msg);
2704 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2705 }
2706 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2707
2708 return;
2709
2710fail:
2711 if (m)
2712 m_freem(m);
2713 if (m0)
2714 m_freem(m0);
2715}
2716
2717/*
2718 * ICMPv6 socket option processing.
2719 */
2720int
2721icmp6_ctloutput(so, sopt)
2722 struct socket *so;
2723 struct sockopt *sopt;
2724{
2725 int error = 0;
2726 int optlen;
2727 struct inpcb *inp = sotoinpcb(so);
2728 int level, op, optname;
2729
2730 if (sopt) {
2731 level = sopt->sopt_level;
2732 op = sopt->sopt_dir;
2733 optname = sopt->sopt_name;
2734 optlen = sopt->sopt_valsize;
2735 } else
2736 level = op = optname = optlen = 0;
2737
2738 if (level != IPPROTO_ICMPV6) {
2739 return EINVAL;
2740 }
2741
2742 switch (op) {
2743 case PRCO_SETOPT:
2744 switch (optname) {
2745 case ICMP6_FILTER:
2746 {
2747 struct icmp6_filter *p;
2748
2749 if (optlen != sizeof(*p)) {
2750 error = EMSGSIZE;
2751 break;
2752 }
2753 if (inp->in6p_icmp6filt == NULL) {
2754 error = EINVAL;
2755 break;
2756 }
2757 error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen,
2758 optlen);
2759 break;
2760 }
2761
2762 default:
2763 error = ENOPROTOOPT;
2764 break;
2765 }
2766 break;
2767
2768 case PRCO_GETOPT:
2769 switch (optname) {
2770 case ICMP6_FILTER:
2771 {
2772 if (inp->in6p_icmp6filt == NULL) {
2773 error = EINVAL;
2774 break;
2775 }
2776 error = sooptcopyout(sopt, inp->in6p_icmp6filt,
2777 sizeof(struct icmp6_filter));
2778 break;
2779 }
2780
2781 default:
2782 error = ENOPROTOOPT;
2783 break;
2784 }
2785 break;
2786 }
2787
2788 return (error);
2789}
2790
2791/*
2792 * Perform rate limit check.
2793 * Returns 0 if it is okay to send the icmp6 packet.
2794 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2795 * limitation.
2796 *
2797 * XXX per-destination/type check necessary?
2798 */
2799static int
2800icmp6_ratelimit(dst, type, code)
2801 const struct in6_addr *dst; /* not used at this moment */
2802 const int type; /* not used at this moment */
2803 const int code; /* not used at this moment */
2804{
2805 int ret;
2806
2807 ret = 0; /* okay to send */
2808
2809 /* PPS limit */
2810 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2811 icmp6errppslim)) {
2812 /* The packet is subject to rate limit */
2813 ret++;
2814 }
2815
2816 return ret;
2817}
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