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1 /*
2 * Copyright (c) 2000-2013 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28
29 /* $FreeBSD: src/sys/netinet6/icmp6.c,v 1.6.2.6 2001/07/10 09:44:16 ume Exp $ */
30 /* $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $ */
31
32 /*
33 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 3. Neither the name of the project nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 */
60
61 /*
62 * Copyright (c) 1982, 1986, 1988, 1993
63 * The Regents of the University of California. All rights reserved.
64 *
65 * Redistribution and use in source and binary forms, with or without
66 * modification, are permitted provided that the following conditions
67 * are met:
68 * 1. Redistributions of source code must retain the above copyright
69 * notice, this list of conditions and the following disclaimer.
70 * 2. Redistributions in binary form must reproduce the above copyright
71 * notice, this list of conditions and the following disclaimer in the
72 * documentation and/or other materials provided with the distribution.
73 * 3. All advertising materials mentioning features or use of this software
74 * must display the following acknowledgement:
75 * This product includes software developed by the University of
76 * California, Berkeley and its contributors.
77 * 4. Neither the name of the University nor the names of its contributors
78 * may be used to endorse or promote products derived from this software
79 * without specific prior written permission.
80 *
81 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
82 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
83 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
84 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
85 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
86 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
87 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
88 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
89 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
90 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
91 * SUCH DAMAGE.
92 *
93 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
94 */
95
96
97 #include <sys/param.h>
98 #include <sys/systm.h>
99 #include <sys/lock.h>
100 #include <sys/malloc.h>
101 #include <sys/mcache.h>
102 #include <sys/mbuf.h>
103 #include <sys/protosw.h>
104 #include <sys/socket.h>
105 #include <sys/socketvar.h>
106 #include <sys/time.h>
107 #include <sys/kernel.h>
108 #include <sys/syslog.h>
109 #include <sys/domain.h>
110 #include <sys/kauth.h>
111
112 #include <net/if.h>
113 #include <net/route.h>
114 #include <net/if_dl.h>
115 #include <net/if_types.h>
116
117 #include <netinet/in.h>
118 #include <netinet/in_var.h>
119 #include <netinet/ip6.h>
120 #include <netinet6/ip6_var.h>
121 #include <netinet/icmp6.h>
122 #include <netinet6/mld6_var.h>
123 #include <netinet/in_pcb.h>
124 #include <netinet6/in6_pcb.h>
125 #include <netinet6/in6_var.h>
126 #include <netinet6/nd6.h>
127 #include <netinet6/in6_ifattach.h>
128 #include <netinet6/ip6protosw.h>
129 #include <netinet6/scope6_var.h>
130
131 #if IPSEC
132 #include <netinet6/ipsec.h>
133 #include <netkey/key.h>
134
135 extern int ipsec_bypass;
136 #endif
137
138 #include <net/net_osdep.h>
139
140 extern struct ip6protosw *ip6_protox[];
141
142 extern uint32_t rip_sendspace;
143 extern uint32_t rip_recvspace;
144
145 struct icmp6stat icmp6stat;
146
147 extern struct inpcbhead ripcb;
148 extern int icmp6errppslim;
149 static int icmp6errpps_count = 0;
150 static struct timeval icmp6errppslim_last;
151 extern int icmp6_nodeinfo;
152 extern struct inpcbinfo ripcbinfo;
153
154 static void icmp6_errcount(struct icmp6errstat *, int, int);
155 static int icmp6_rip6_input(struct mbuf **, int);
156 static int icmp6_ratelimit(const struct in6_addr *, const int, const int);
157 static const char *icmp6_redirect_diag(struct in6_addr *,
158 struct in6_addr *, struct in6_addr *);
159 static struct mbuf *ni6_input(struct mbuf *, int);
160 static struct mbuf *ni6_nametodns(const char *, int, int);
161 static int ni6_dnsmatch(const char *, int, const char *, int);
162 static int ni6_addrs(struct icmp6_nodeinfo *,
163 struct ifnet **, char *);
164 static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
165 struct ifnet *, int);
166 static int icmp6_notify_error(struct mbuf *, int, int, int);
167
168
169
170 void
171 icmp6_init(struct ip6protosw *pp, struct domain *dp)
172 {
173 #pragma unused(dp)
174 static int icmp6_initialized = 0;
175
176 /* Also called from ip6_init() without pp */
177 VERIFY(pp == NULL ||
178 (pp->pr_flags & (PR_INITIALIZED|PR_ATTACHED)) == PR_ATTACHED);
179
180 /* This gets called by more than one protocols, so initialize once */
181 if (!icmp6_initialized) {
182 icmp6_initialized = 1;
183 mld_init();
184 }
185 }
186
187 static void
188 icmp6_errcount(stat, type, code)
189 struct icmp6errstat *stat;
190 int type, code;
191 {
192 switch (type) {
193 case ICMP6_DST_UNREACH:
194 switch (code) {
195 case ICMP6_DST_UNREACH_NOROUTE:
196 stat->icp6errs_dst_unreach_noroute++;
197 return;
198 case ICMP6_DST_UNREACH_ADMIN:
199 stat->icp6errs_dst_unreach_admin++;
200 return;
201 case ICMP6_DST_UNREACH_BEYONDSCOPE:
202 stat->icp6errs_dst_unreach_beyondscope++;
203 return;
204 case ICMP6_DST_UNREACH_ADDR:
205 stat->icp6errs_dst_unreach_addr++;
206 return;
207 case ICMP6_DST_UNREACH_NOPORT:
208 stat->icp6errs_dst_unreach_noport++;
209 return;
210 }
211 break;
212 case ICMP6_PACKET_TOO_BIG:
213 stat->icp6errs_packet_too_big++;
214 return;
215 case ICMP6_TIME_EXCEEDED:
216 switch (code) {
217 case ICMP6_TIME_EXCEED_TRANSIT:
218 stat->icp6errs_time_exceed_transit++;
219 return;
220 case ICMP6_TIME_EXCEED_REASSEMBLY:
221 stat->icp6errs_time_exceed_reassembly++;
222 return;
223 }
224 break;
225 case ICMP6_PARAM_PROB:
226 switch (code) {
227 case ICMP6_PARAMPROB_HEADER:
228 stat->icp6errs_paramprob_header++;
229 return;
230 case ICMP6_PARAMPROB_NEXTHEADER:
231 stat->icp6errs_paramprob_nextheader++;
232 return;
233 case ICMP6_PARAMPROB_OPTION:
234 stat->icp6errs_paramprob_option++;
235 return;
236 }
237 break;
238 case ND_REDIRECT:
239 stat->icp6errs_redirect++;
240 return;
241 }
242 stat->icp6errs_unknown++;
243 }
244
245 /*
246 * A wrapper function for icmp6_error() necessary when the erroneous packet
247 * may not contain enough scope zone information.
248 */
249 void
250 icmp6_error2(struct mbuf *m, int type, int code, int param,
251 struct ifnet *ifp)
252 {
253 struct ip6_hdr *ip6;
254
255 if (ifp == NULL)
256 return;
257
258 #ifndef PULLDOWN_TEST
259 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr),return );
260 #else
261 if (m->m_len < sizeof(struct ip6_hdr)) {
262 m = m_pullup(m, sizeof(struct ip6_hdr));
263 if (m == NULL)
264 return;
265 }
266 #endif
267
268 ip6 = mtod(m, struct ip6_hdr *);
269
270 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
271 return;
272 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
273 return;
274
275 icmp6_error(m, type, code, param);
276 }
277
278 /*
279 * Generate an error packet of type error in response to bad IP6 packet.
280 */
281 void
282 icmp6_error(struct mbuf *m, int type, int code, int param)
283 {
284 struct ip6_hdr *oip6, *nip6;
285 struct icmp6_hdr *icmp6;
286 u_int preplen;
287 int off;
288 int nxt;
289
290 icmp6stat.icp6s_error++;
291
292 /* count per-type-code statistics */
293 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
294
295 #ifdef M_DECRYPTED /*not openbsd*/
296 if (m->m_flags & M_DECRYPTED) {
297 icmp6stat.icp6s_canterror++;
298 goto freeit;
299 }
300 #endif
301
302 #ifndef PULLDOWN_TEST
303 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), return);
304 #else
305 if (m->m_len < sizeof(struct ip6_hdr)) {
306 m = m_pullup(m, sizeof(struct ip6_hdr));
307 if (m == NULL)
308 return;
309 }
310 #endif
311 oip6 = mtod(m, struct ip6_hdr *);
312
313 /*
314 * If the destination address of the erroneous packet is a multicast
315 * address, or the packet was sent using link-layer multicast,
316 * we should basically suppress sending an error (RFC 2463, Section
317 * 2.4).
318 * We have two exceptions (the item e.2 in that section):
319 * - the Pakcet Too Big message can be sent for path MTU discovery.
320 * - the Parameter Problem Message that can be allowed an icmp6 error
321 * in the option type field. This check has been done in
322 * ip6_unknown_opt(), so we can just check the type and code.
323 */
324 if ((m->m_flags & (M_BCAST|M_MCAST) ||
325 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
326 (type != ICMP6_PACKET_TOO_BIG &&
327 (type != ICMP6_PARAM_PROB ||
328 code != ICMP6_PARAMPROB_OPTION)))
329 goto freeit;
330
331 /*
332 * RFC 2463, 2.4 (e.5): source address check.
333 * XXX: the case of anycast source?
334 */
335 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
336 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
337 goto freeit;
338
339 /*
340 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
341 * don't do it.
342 */
343 nxt = -1;
344 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
345 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
346 struct icmp6_hdr *icp;
347
348 #ifndef PULLDOWN_TEST
349 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), return);
350 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
351 #else
352 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
353 sizeof(*icp));
354 if (icp == NULL) {
355 icmp6stat.icp6s_tooshort++;
356 return;
357 }
358 #endif
359 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
360 icp->icmp6_type == ND_REDIRECT) {
361 /*
362 * ICMPv6 error
363 * Special case: for redirect (which is
364 * informational) we must not send icmp6 error.
365 */
366 icmp6stat.icp6s_canterror++;
367 goto freeit;
368 } else {
369 /* ICMPv6 informational - send the error */
370 }
371 } else {
372 /* non-ICMPv6 - send the error */
373 }
374
375 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
376
377 /* Finally, do rate limitation check. */
378 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
379 icmp6stat.icp6s_toofreq++;
380 goto freeit;
381 }
382
383 /*
384 * OK, ICMP6 can be generated.
385 */
386
387 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
388 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
389
390 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
391 M_PREPEND(m, preplen, M_DONTWAIT);
392 if (m && m->m_len < preplen)
393 m = m_pullup(m, preplen);
394 if (m == NULL) {
395 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
396 return;
397 }
398
399 nip6 = mtod(m, struct ip6_hdr *);
400 nip6->ip6_src = oip6->ip6_src;
401 nip6->ip6_dst = oip6->ip6_dst;
402
403 in6_clearscope(&oip6->ip6_src);
404 in6_clearscope(&oip6->ip6_dst);
405
406 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
407 icmp6->icmp6_type = type;
408 icmp6->icmp6_code = code;
409 icmp6->icmp6_pptr = htonl((u_int32_t)param);
410
411 /*
412 * icmp6_reflect() is designed to be in the input path.
413 * icmp6_error() can be called from both input and output path,
414 * and if we are in output path rcvif could contain bogus value.
415 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
416 * information in ip header (nip6).
417 */
418 m->m_pkthdr.rcvif = NULL;
419
420 icmp6stat.icp6s_outhist[type]++;
421 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
422
423 return;
424
425 freeit:
426 /*
427 * If we can't tell whether or not we can generate ICMP6, free it.
428 */
429 m_freem(m);
430 }
431
432 /*
433 * Process a received ICMP6 message.
434 */
435 int
436 icmp6_input(struct mbuf **mp, int *offp, int proto)
437 {
438 #pragma unused(proto)
439 struct mbuf *m = *mp, *n;
440 struct ifnet *ifp;
441 struct ip6_hdr *ip6, *nip6;
442 struct icmp6_hdr *icmp6, *nicmp6;
443 int off = *offp;
444 int icmp6len = m->m_pkthdr.len - *offp;
445 int code, sum, noff, proxy = 0;
446
447 ifp = m->m_pkthdr.rcvif;
448
449 #ifndef PULLDOWN_TEST
450 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), return IPPROTO_DONE);
451 /* m might change if M_LOOP. So, call mtod after this */
452 #endif
453
454 /* Expect 32-bit aligned data pointer on strict-align platforms */
455 MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
456
457 /*
458 * Locate icmp6 structure in mbuf, and check
459 * that not corrupted and of at least minimum length
460 */
461 ip6 = mtod(m, struct ip6_hdr *);
462 if (icmp6len < sizeof(struct icmp6_hdr)) {
463 icmp6stat.icp6s_tooshort++;
464 goto freeit;
465 }
466
467 #ifndef PULLDOWN_TEST
468 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
469 #else
470 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
471 if (icmp6 == NULL) {
472 icmp6stat.icp6s_tooshort++;
473 return IPPROTO_DONE;
474 }
475 #endif
476 code = icmp6->icmp6_code;
477
478 /* Apply rate limit before checksum validation. */
479 if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) {
480 icmp6stat.icp6s_toofreq++;
481 goto freeit;
482 }
483
484 /*
485 * Check multicast group membership.
486 * Note: SSM filters are not applied for ICMPv6 traffic.
487 */
488 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
489 struct in6_multi *inm;
490
491 in6_multihead_lock_shared();
492 IN6_LOOKUP_MULTI(&ip6->ip6_dst, ifp, inm);
493 in6_multihead_lock_done();
494
495 if (inm == NULL) {
496 /*
497 * Don't discard if this is a Neighbor Solicitation
498 * that needs to be proxied (see check down below.)
499 */
500 if (!(m->m_pkthdr.pkt_flags & PKTF_PROXY_DST)) {
501 ip6stat.ip6s_notmember++;
502 in6_ifstat_inc(m->m_pkthdr.rcvif,
503 ifs6_in_discard);
504 goto freeit;
505 }
506 } else {
507 IN6M_REMREF(inm);
508 }
509 }
510
511 /*
512 * calculate the checksum
513 */
514 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
515 nd6log((LOG_ERR,
516 "ICMP6 checksum error(%d|%x) %s\n",
517 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
518 icmp6stat.icp6s_checksum++;
519 goto freeit;
520 }
521
522 if (m->m_pkthdr.pkt_flags & PKTF_PROXY_DST) {
523 /*
524 * This is the special case of proxying NS (dst is either
525 * solicited-node multicast or unicast); process it locally
526 * but don't deliver it to sockets. It practically lets us
527 * steer the packet to nd6_prproxy_ns_input, where more
528 * specific tests and actions will be taken.
529 */
530 switch (icmp6->icmp6_type) {
531 case ND_NEIGHBOR_SOLICIT:
532 proxy = 1;
533 break;
534 default:
535 goto freeit;
536 }
537 }
538
539 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
540 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
541 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
542 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
543
544 switch (icmp6->icmp6_type) {
545 case ICMP6_DST_UNREACH:
546 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
547 switch (code) {
548 case ICMP6_DST_UNREACH_NOROUTE:
549 code = PRC_UNREACH_NET;
550 break;
551 case ICMP6_DST_UNREACH_ADMIN:
552 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
553 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
554 break;
555 case ICMP6_DST_UNREACH_ADDR:
556 code = PRC_HOSTDEAD;
557 break;
558 case ICMP6_DST_UNREACH_BEYONDSCOPE:
559 /* I mean "source address was incorrect." */
560 code = PRC_PARAMPROB;
561 break;
562 case ICMP6_DST_UNREACH_NOPORT:
563 code = PRC_UNREACH_PORT;
564 break;
565 default:
566 goto badcode;
567 }
568 goto deliver;
569 break;
570
571 case ICMP6_PACKET_TOO_BIG:
572 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
573
574 code = PRC_MSGSIZE;
575
576 /*
577 * Updating the path MTU will be done after examining
578 * intermediate extension headers.
579 */
580 goto deliver;
581 break;
582
583 case ICMP6_TIME_EXCEEDED:
584 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
585 switch (code) {
586 case ICMP6_TIME_EXCEED_TRANSIT:
587 code = PRC_TIMXCEED_INTRANS;
588 break;
589 case ICMP6_TIME_EXCEED_REASSEMBLY:
590 code = PRC_TIMXCEED_REASS;
591 break;
592 default:
593 goto badcode;
594 }
595 goto deliver;
596 break;
597
598 case ICMP6_PARAM_PROB:
599 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
600 switch (code) {
601 case ICMP6_PARAMPROB_NEXTHEADER:
602 code = PRC_UNREACH_PROTOCOL;
603 break;
604 case ICMP6_PARAMPROB_HEADER:
605 case ICMP6_PARAMPROB_OPTION:
606 code = PRC_PARAMPROB;
607 break;
608 default:
609 goto badcode;
610 }
611 goto deliver;
612 break;
613
614 case ICMP6_ECHO_REQUEST:
615 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
616 if (code != 0)
617 goto badcode;
618
619 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
620 /* Give up remote */
621 goto rate_limit_checked;
622 break;
623 }
624 if ((n->m_flags & M_EXT) != 0
625 || n->m_len < off + sizeof(struct icmp6_hdr)) {
626 struct mbuf *n0 = n;
627 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
628
629 /*
630 * Prepare an internal mbuf. m_pullup() doesn't
631 * always copy the length we specified.
632 */
633 if (maxlen >= MCLBYTES) {
634 /* Give up remote */
635 m_freem(n0);
636 goto rate_limit_checked;
637 break;
638 }
639 MGETHDR(n, M_DONTWAIT, n0->m_type); /* MAC-OK */
640 if (n && maxlen >= MHLEN) {
641 MCLGET(n, M_DONTWAIT);
642 if ((n->m_flags & M_EXT) == 0) {
643 m_free(n);
644 n = NULL;
645 }
646 }
647 if (n == NULL) {
648 /* Give up remote */
649 m_freem(n0);
650 goto rate_limit_checked;
651 break;
652 }
653 M_COPY_PKTHDR(n, n0);
654 /*
655 * Copy IPv6 and ICMPv6 only.
656 */
657 nip6 = mtod(n, struct ip6_hdr *);
658 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
659 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
660 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
661 noff = sizeof(struct ip6_hdr);
662 n->m_pkthdr.len = n->m_len =
663 noff + sizeof(struct icmp6_hdr);
664 /*
665 * Adjust mbuf. ip6_plen will be adjusted in
666 * ip6_output().
667 */
668 m_adj(n0, off + sizeof(struct icmp6_hdr));
669 n->m_pkthdr.len += n0->m_pkthdr.len;
670 n->m_next = n0;
671 n0->m_flags &= ~M_PKTHDR;
672 } else {
673 nip6 = mtod(n, struct ip6_hdr *);
674 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
675 sizeof(*nicmp6));
676 noff = off;
677 }
678 if(nicmp6 == NULL)
679 panic("nicmp6 is NULL in %s, which isn't good!\n", __FUNCTION__);
680 else {
681 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
682 nicmp6->icmp6_code = 0;
683 }
684 if (n) {
685 icmp6stat.icp6s_reflect++;
686 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
687 icmp6_reflect(n, noff);
688 }
689 goto rate_limit_checked;
690 break;
691
692 case ICMP6_ECHO_REPLY:
693 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
694 if (code != 0)
695 goto badcode;
696 break;
697
698 case MLD_LISTENER_QUERY:
699 case MLD_LISTENER_REPORT:
700
701 if (icmp6len < sizeof(struct mld_hdr))
702 goto badlen;
703 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
704 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
705 else
706 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
707
708 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
709 /* give up local */
710 if (mld_input(m, off, icmp6len) == IPPROTO_DONE)
711 m = NULL;
712 goto freeit;
713 }
714 if (mld_input(n, off, icmp6len) != IPPROTO_DONE)
715 m_freem(n);
716 /* m stays. */
717 goto rate_limit_checked;
718 break;
719
720 case MLD_LISTENER_DONE:
721 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
722 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
723 goto badlen;
724 break; /* nothing to be done in kernel */
725
726 case MLD_MTRACE_RESP:
727 case MLD_MTRACE:
728 /* XXX: these two are experimental. not officially defined. */
729 /* XXX: per-interface statistics? */
730 break; /* just pass it to applications */
731
732 case ICMP6_NI_QUERY:
733 if (!icmp6_nodeinfo)
734 break;
735 //### LD 10/20 Check fbsd differences here. Not sure we're more advanced or not.
736 /* By RFC 4620 refuse to answer queries from global scope addresses */
737 if ((icmp6_nodeinfo & 8) != 8 && in6_addrscope(&ip6->ip6_src) == IPV6_ADDR_SCOPE_GLOBAL)
738 break;
739
740 if (icmp6len < sizeof(struct icmp6_nodeinfo))
741 goto badlen;
742
743 #ifndef PULLDOWN_TEST
744 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
745 return IPPROTO_DONE);
746 #endif
747
748 n = m_copy(m, 0, M_COPYALL);
749 if (n)
750 n = ni6_input(n, off);
751 if (n) {
752 noff = sizeof(struct ip6_hdr);
753 icmp6stat.icp6s_reflect++;
754 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
755 icmp6_reflect(n, noff);
756 }
757 goto rate_limit_checked;
758 break;
759
760 case ICMP6_WRUREPLY:
761 if (code != 0)
762 goto badcode;
763 break;
764
765 case ND_ROUTER_SOLICIT:
766 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
767 if (code != 0)
768 goto badcode;
769 if (icmp6len < sizeof(struct nd_router_solicit))
770 goto badlen;
771
772 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
773 /* give up local */
774 nd6_rs_input(m, off, icmp6len);
775 m = NULL;
776 goto freeit;
777 }
778 nd6_rs_input(n, off, icmp6len);
779 /* m stays. */
780 goto rate_limit_checked;
781 break;
782
783 case ND_ROUTER_ADVERT:
784 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
785 if (code != 0)
786 goto badcode;
787 if (icmp6len < sizeof(struct nd_router_advert))
788 goto badlen;
789
790 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
791 /* give up local */
792 nd6_ra_input(m, off, icmp6len);
793 m = NULL;
794 goto freeit;
795 }
796 nd6_ra_input(n, off, icmp6len);
797 /* m stays. */
798 goto rate_limit_checked;
799 break;
800
801 case ND_NEIGHBOR_SOLICIT:
802 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
803 if (code != 0)
804 goto badcode;
805 if (icmp6len < sizeof(struct nd_neighbor_solicit))
806 goto badlen;
807
808 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
809 /* give up local */
810 nd6_ns_input(m, off, icmp6len);
811 m = NULL;
812 goto freeit;
813 }
814 nd6_ns_input(n, off, icmp6len);
815 /* m stays. */
816 goto rate_limit_checked;
817 break;
818
819 case ND_NEIGHBOR_ADVERT:
820 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
821 if (code != 0)
822 goto badcode;
823 if (icmp6len < sizeof(struct nd_neighbor_advert))
824 goto badlen;
825
826 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
827 /* give up local */
828 nd6_na_input(m, off, icmp6len);
829 m = NULL;
830 goto freeit;
831 }
832 nd6_na_input(n, off, icmp6len);
833 /* m stays. */
834 goto rate_limit_checked;
835 break;
836
837 case ND_REDIRECT:
838 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
839 if (code != 0)
840 goto badcode;
841 if (icmp6len < sizeof(struct nd_redirect))
842 goto badlen;
843
844 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
845 /* give up local */
846 icmp6_redirect_input(m, off);
847 m = NULL;
848 goto freeit;
849 }
850 icmp6_redirect_input(n, off);
851 /* m stays. */
852 goto rate_limit_checked;
853 break;
854
855 case ICMP6_ROUTER_RENUMBERING:
856 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
857 code != ICMP6_ROUTER_RENUMBERING_RESULT)
858 goto badcode;
859 if (icmp6len < sizeof(struct icmp6_router_renum))
860 goto badlen;
861 break;
862
863 default:
864 nd6log((LOG_DEBUG,
865 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
866 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
867 ip6_sprintf(&ip6->ip6_dst),
868 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
869 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
870 /* ICMPv6 error: MUST deliver it by spec... */
871 code = PRC_NCMDS;
872 /* deliver */
873 } else {
874 /* ICMPv6 informational: MUST not deliver */
875 goto rate_limit_checked;
876 break;
877 }
878 deliver:
879 if (icmp6_notify_error(m, off, icmp6len, code)) {
880 /* In this case, m should've been freed. */
881 return(IPPROTO_DONE);
882 }
883 break;
884
885 badcode:
886 icmp6stat.icp6s_badcode++;
887 break;
888
889 badlen:
890 icmp6stat.icp6s_badlen++;
891 break;
892 }
893
894 rate_limit_checked:
895 /* deliver the packet to appropriate sockets (unless proxying) */
896 if (!proxy) {
897 icmp6_rip6_input(&m, *offp);
898 return IPPROTO_DONE;
899 }
900
901 freeit:
902 m_freem(m);
903 return IPPROTO_DONE;
904 }
905
906 static int
907 icmp6_notify_error(m, off, icmp6len, code)
908 struct mbuf *m;
909 int off, icmp6len, code;
910 {
911 struct icmp6_hdr *icmp6;
912 struct ip6_hdr *eip6;
913 u_int32_t notifymtu;
914 struct sockaddr_in6 icmp6src, icmp6dst;
915
916 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
917 icmp6stat.icp6s_tooshort++;
918 goto freeit;
919 }
920 #ifndef PULLDOWN_TEST
921 IP6_EXTHDR_CHECK(m, off,
922 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
923 return -1);
924 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
925 #else
926 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
927 sizeof(*icmp6) + sizeof(struct ip6_hdr));
928 if (icmp6 == NULL) {
929 icmp6stat.icp6s_tooshort++;
930 return(-1);
931 }
932 #endif
933 eip6 = (struct ip6_hdr *)(icmp6 + 1);
934
935 /* Detect the upper level protocol */
936 {
937 void (*ctlfunc)(int, struct sockaddr *, void *);
938 u_int8_t nxt = eip6->ip6_nxt;
939 int eoff = off + sizeof(struct icmp6_hdr) +
940 sizeof(struct ip6_hdr);
941 struct ip6ctlparam ip6cp;
942 struct in6_addr *finaldst = NULL;
943 int icmp6type = icmp6->icmp6_type;
944 struct ip6_frag *fh;
945 struct ip6_rthdr *rth;
946 struct ip6_rthdr0 *rth0;
947 int rthlen;
948
949 while (1) { /* XXX: should avoid infinite loop explicitly? */
950 struct ip6_ext *eh;
951
952 switch (nxt) {
953 case IPPROTO_HOPOPTS:
954 case IPPROTO_DSTOPTS:
955 case IPPROTO_AH:
956 #ifndef PULLDOWN_TEST
957 IP6_EXTHDR_CHECK(m, 0, eoff +
958 sizeof(struct ip6_ext),
959 return -1);
960 eh = (struct ip6_ext *)(mtod(m, caddr_t)
961 + eoff);
962 #else
963 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
964 eoff, sizeof(*eh));
965 if (eh == NULL) {
966 icmp6stat.icp6s_tooshort++;
967 return(-1);
968 }
969 #endif
970
971 if (nxt == IPPROTO_AH)
972 eoff += (eh->ip6e_len + 2) << 2;
973 else
974 eoff += (eh->ip6e_len + 1) << 3;
975 nxt = eh->ip6e_nxt;
976 break;
977 case IPPROTO_ROUTING:
978 /*
979 * When the erroneous packet contains a
980 * routing header, we should examine the
981 * header to determine the final destination.
982 * Otherwise, we can't properly update
983 * information that depends on the final
984 * destination (e.g. path MTU).
985 */
986 #ifndef PULLDOWN_TEST
987 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
988 return -1);
989 rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
990 + eoff);
991 #else
992 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
993 eoff, sizeof(*rth));
994 if (rth == NULL) {
995 icmp6stat.icp6s_tooshort++;
996 return(-1);
997 }
998 #endif
999 rthlen = (rth->ip6r_len + 1) << 3;
1000 /*
1001 * XXX: currently there is no
1002 * officially defined type other
1003 * than type-0.
1004 * Note that if the segment left field
1005 * is 0, all intermediate hops must
1006 * have been passed.
1007 */
1008 if (rth->ip6r_segleft &&
1009 rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
1010 int hops;
1011
1012 #ifndef PULLDOWN_TEST
1013 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen,
1014 return -1);
1015 rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff);
1016 #else
1017 IP6_EXTHDR_GET(rth0,
1018 struct ip6_rthdr0 *, m,
1019 eoff, rthlen);
1020 if (rth0 == NULL) {
1021 icmp6stat.icp6s_tooshort++;
1022 return(-1);
1023 }
1024 #endif
1025 /* just ignore a bogus header */
1026 if ((rth0->ip6r0_len % 2) == 0 &&
1027 (hops = rth0->ip6r0_len/2))
1028 finaldst = (struct in6_addr *)(void *)(rth0 + 1) + (hops - 1);
1029 }
1030 eoff += rthlen;
1031 nxt = rth->ip6r_nxt;
1032 break;
1033 case IPPROTO_FRAGMENT:
1034 #ifndef PULLDOWN_TEST
1035 IP6_EXTHDR_CHECK(m, 0, eoff +
1036 sizeof(struct ip6_frag),
1037 return -1);
1038 fh = (struct ip6_frag *)(mtod(m, caddr_t)
1039 + eoff);
1040 #else
1041 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
1042 eoff, sizeof(*fh));
1043 if (fh == NULL) {
1044 icmp6stat.icp6s_tooshort++;
1045 return (-1);
1046 }
1047 #endif
1048 /*
1049 * Data after a fragment header is meaningless
1050 * unless it is the first fragment, but
1051 * we'll go to the notify label for path MTU
1052 * discovery.
1053 */
1054 if (fh->ip6f_offlg & IP6F_OFF_MASK)
1055 goto notify;
1056
1057 eoff += sizeof(struct ip6_frag);
1058 nxt = fh->ip6f_nxt;
1059 break;
1060 default:
1061 /*
1062 * This case includes ESP and the No Next
1063 * Header. In such cases going to the notify
1064 * label does not have any meaning
1065 * (i.e. ctlfunc will be NULL), but we go
1066 * anyway since we might have to update
1067 * path MTU information.
1068 */
1069 goto notify;
1070 }
1071 }
1072 notify:
1073 #ifndef PULLDOWN_TEST
1074 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1075 #else
1076 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1077 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1078 if (icmp6 == NULL) {
1079 icmp6stat.icp6s_tooshort++;
1080 return (-1);
1081 }
1082 #endif
1083
1084 /*
1085 * retrieve parameters from the inner IPv6 header, and convert
1086 * them into sockaddr structures.
1087 * XXX: there is no guarantee that the source or destination
1088 * addresses of the inner packet are in the same scope as
1089 * the addresses of the icmp packet. But there is no other
1090 * way to determine the zone.
1091 */
1092 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1093
1094 bzero(&icmp6dst, sizeof(icmp6dst));
1095 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1096 icmp6dst.sin6_family = AF_INET6;
1097 if (finaldst == NULL)
1098 icmp6dst.sin6_addr = eip6->ip6_dst;
1099 else
1100 icmp6dst.sin6_addr = *finaldst;
1101 if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
1102 goto freeit;
1103 bzero(&icmp6src, sizeof(icmp6src));
1104 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1105 icmp6src.sin6_family = AF_INET6;
1106 icmp6src.sin6_addr = eip6->ip6_src;
1107 if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
1108 goto freeit;
1109 icmp6src.sin6_flowinfo =
1110 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1111
1112 if (finaldst == NULL)
1113 finaldst = &eip6->ip6_dst;
1114 ip6cp.ip6c_m = m;
1115 ip6cp.ip6c_icmp6 = icmp6;
1116 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1117 ip6cp.ip6c_off = eoff;
1118 ip6cp.ip6c_finaldst = finaldst;
1119 ip6cp.ip6c_src = &icmp6src;
1120 ip6cp.ip6c_nxt = nxt;
1121
1122 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1123 notifymtu = ntohl(icmp6->icmp6_mtu);
1124 ip6cp.ip6c_cmdarg = (void *)&notifymtu;
1125 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1126 }
1127
1128 ctlfunc = (void (*)(int, struct sockaddr *, void *))
1129 (ip6_protox[nxt]->pr_ctlinput);
1130 if (ctlfunc) {
1131 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
1132 &ip6cp);
1133 }
1134 }
1135 return(0);
1136
1137 freeit:
1138 m_freem(m);
1139 return(-1);
1140 }
1141
1142 void
1143 icmp6_mtudisc_update(ip6cp, validated)
1144 struct ip6ctlparam *ip6cp;
1145 int validated;
1146 {
1147 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1148 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1149 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1150 u_int mtu = ntohl(icmp6->icmp6_mtu);
1151 struct rtentry *rt = NULL;
1152 struct sockaddr_in6 sin6;
1153 /*
1154 * we reject ICMPv6 too big with abnormally small value.
1155 * XXX what is the good definition of "abnormally small"?
1156 */
1157 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
1158 return;
1159
1160 if (!validated)
1161 return;
1162
1163 /*
1164 * In case the suggested mtu is less than IPV6_MMTU, we
1165 * only need to remember that it was for above mentioned
1166 * "alwaysfrag" case.
1167 * Try to be as close to the spec as possible.
1168 */
1169 if (mtu < IPV6_MMTU)
1170 mtu = IPV6_MMTU - 8;
1171
1172 bzero(&sin6, sizeof(sin6));
1173 sin6.sin6_family = PF_INET6;
1174 sin6.sin6_len = sizeof(struct sockaddr_in6);
1175 sin6.sin6_addr = *dst;
1176 /* XXX normally, this won't happen */
1177 if (IN6_IS_ADDR_LINKLOCAL(dst)) {
1178 sin6.sin6_addr.s6_addr16[1] =
1179 htons(m->m_pkthdr.rcvif->if_index);
1180 }
1181 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
1182 rt = rtalloc1_scoped((struct sockaddr *)&sin6, 0,
1183 RTF_CLONING | RTF_PRCLONING, m->m_pkthdr.rcvif->if_index);
1184 if (rt != NULL) {
1185 RT_LOCK(rt);
1186 if ((rt->rt_flags & RTF_HOST) &&
1187 !(rt->rt_rmx.rmx_locks & RTV_MTU) &&
1188 mtu < IN6_LINKMTU(rt->rt_ifp) &&
1189 rt->rt_rmx.rmx_mtu > mtu) {
1190 icmp6stat.icp6s_pmtuchg++;
1191 rt->rt_rmx.rmx_mtu = mtu;
1192 }
1193 RT_UNLOCK(rt);
1194 rtfree(rt);
1195 }
1196 }
1197
1198 /*
1199 * Process a Node Information Query packet, based on
1200 * draft-ietf-ipngwg-icmp-name-lookups-07.
1201 *
1202 * Spec incompatibilities:
1203 * - IPv6 Subject address handling
1204 * - IPv4 Subject address handling support missing
1205 * - Proxy reply (answer even if it's not for me)
1206 * - joins NI group address at in6_ifattach() time only, does not cope
1207 * with hostname changes by sethostname(3)
1208 */
1209 #define hostnamelen strlen(hostname)
1210 static struct mbuf *
1211 ni6_input(m, off)
1212 struct mbuf *m;
1213 int off;
1214 {
1215 struct icmp6_nodeinfo *ni6, *nni6;
1216 struct mbuf *n = NULL;
1217 u_int16_t qtype;
1218 int subjlen;
1219 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1220 struct ni_reply_fqdn *fqdn;
1221 int addrs; /* for NI_QTYPE_NODEADDR */
1222 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1223 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
1224 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
1225 struct ip6_hdr *ip6;
1226 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1227 char *subj = NULL;
1228
1229 ip6 = mtod(m, struct ip6_hdr *);
1230 #ifndef PULLDOWN_TEST
1231 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1232 #else
1233 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1234 if (ni6 == NULL) {
1235 /* m is already reclaimed */
1236 return (NULL);
1237 }
1238 #endif
1239
1240 /*
1241 * Validate IPv6 source address.
1242 * The default configuration MUST be to refuse answering queries from
1243 * global-scope addresses according to RFC4602.
1244 * Notes:
1245 * - it's not very clear what "refuse" means; this implementation
1246 * simply drops it.
1247 * - it's not very easy to identify global-scope (unicast) addresses
1248 * since there are many prefixes for them. It should be safer
1249 * and in practice sufficient to check "all" but loopback and
1250 * link-local (note that site-local unicast was deprecated and
1251 * ULA is defined as global scope-wise)
1252 */
1253 if ((icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 &&
1254 !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) &&
1255 !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
1256 goto bad;
1257
1258 /*
1259 * Validate IPv6 destination address.
1260 *
1261 * The Responder must discard the Query without further processing
1262 * unless it is one of the Responder's unicast or anycast addresses, or
1263 * a link-local scope multicast address which the Responder has joined.
1264 * [RFC4602, Section 5.]
1265 */
1266 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
1267 if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1268 goto bad;
1269 /* else it's a link-local multicast, fine */
1270 } else { /* unicast or anycast */
1271 uint32_t ia6_flags;
1272
1273 if (ip6_getdstifaddr_info(m, NULL, &ia6_flags) != 0)
1274 goto bad; /* XXX impossible */
1275
1276 if ((ia6_flags & IN6_IFF_TEMPORARY) &&
1277 !(icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) {
1278 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1279 "a temporary address in %s:%d",
1280 __FILE__, __LINE__));
1281 goto bad;
1282 }
1283 }
1284
1285 /* validate query Subject field. */
1286 qtype = ntohs(ni6->ni_qtype);
1287 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1288 switch (qtype) {
1289 case NI_QTYPE_NOOP:
1290 case NI_QTYPE_SUPTYPES:
1291 /* 07 draft */
1292 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1293 break;
1294 /* FALLTHROUGH */
1295 case NI_QTYPE_FQDN:
1296 case NI_QTYPE_NODEADDR:
1297 case NI_QTYPE_IPV4ADDR:
1298 switch (ni6->ni_code) {
1299 case ICMP6_NI_SUBJ_IPV6:
1300 #if ICMP6_NI_SUBJ_IPV6 != 0
1301 case 0:
1302 #endif
1303 /*
1304 * backward compatibility - try to accept 03 draft
1305 * format, where no Subject is present.
1306 */
1307 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1308 subjlen == 0) {
1309 oldfqdn++;
1310 break;
1311 }
1312 #if ICMP6_NI_SUBJ_IPV6 != 0
1313 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1314 goto bad;
1315 #endif
1316
1317 if (subjlen != sizeof(struct in6_addr))
1318 goto bad;
1319
1320 /*
1321 * Validate Subject address.
1322 *
1323 * Not sure what exactly "address belongs to the node"
1324 * means in the spec, is it just unicast, or what?
1325 *
1326 * At this moment we consider Subject address as
1327 * "belong to the node" if the Subject address equals
1328 * to the IPv6 destination address; validation for
1329 * IPv6 destination address should have done enough
1330 * check for us.
1331 *
1332 * We do not do proxy at this moment.
1333 */
1334 /* m_pulldown instead of copy? */
1335 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1336 subjlen, (caddr_t)&sin6.sin6_addr);
1337 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1338 &sin6.sin6_addr);
1339 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL,
1340 NULL);
1341 bzero(&sin6_d, sizeof(sin6_d));
1342 sin6_d.sin6_family = AF_INET6; /* not used, actually */
1343 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */
1344 sin6_d.sin6_addr = ip6->ip6_dst;
1345 sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1346 &ip6->ip6_dst);
1347 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL,
1348 NULL);
1349 subj = (char *)&sin6;
1350 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
1351 break;
1352
1353 /*
1354 * XXX if we are to allow other cases, we should really
1355 * be careful about scope here.
1356 * basically, we should disallow queries toward IPv6
1357 * destination X with subject Y,
1358 * if scope(X) > scope(Y).
1359 * if we allow scope(X) > scope(Y), it will result in
1360 * information leakage across scope boundary.
1361 */
1362 goto bad;
1363
1364 case ICMP6_NI_SUBJ_FQDN:
1365 /*
1366 * Validate Subject name with gethostname(3).
1367 *
1368 * The behavior may need some debate, since:
1369 * - we are not sure if the node has FQDN as
1370 * hostname (returned by gethostname(3)).
1371 * - the code does wildcard match for truncated names.
1372 * however, we are not sure if we want to perform
1373 * wildcard match, if gethostname(3) side has
1374 * truncated hostname.
1375 */
1376 n = ni6_nametodns(hostname, hostnamelen, 0);
1377 if (!n || n->m_next || n->m_len == 0)
1378 goto bad;
1379 IP6_EXTHDR_GET(subj, char *, m,
1380 off + sizeof(struct icmp6_nodeinfo), subjlen);
1381 if (subj == NULL)
1382 goto bad;
1383 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1384 n->m_len)) {
1385 goto bad;
1386 }
1387 m_freem(n);
1388 n = NULL;
1389 break;
1390
1391 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1392 default:
1393 goto bad;
1394 }
1395 break;
1396 }
1397
1398 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1399 switch (qtype) {
1400 case NI_QTYPE_FQDN:
1401 if ((icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0)
1402 goto bad;
1403 break;
1404 case NI_QTYPE_NODEADDR:
1405 case NI_QTYPE_IPV4ADDR:
1406 if ((icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0)
1407 goto bad;
1408 break;
1409 }
1410
1411 /* guess reply length */
1412 switch (qtype) {
1413 case NI_QTYPE_NOOP:
1414 break; /* no reply data */
1415 case NI_QTYPE_SUPTYPES:
1416 replylen += sizeof(u_int32_t);
1417 break;
1418 case NI_QTYPE_FQDN:
1419 /* XXX will append an mbuf */
1420 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1421 break;
1422 case NI_QTYPE_NODEADDR:
1423 addrs = ni6_addrs(ni6, &ifp, subj);
1424 if ((replylen += addrs * (sizeof(struct in6_addr) +
1425 sizeof(u_int32_t))) > MCLBYTES)
1426 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1427 break;
1428 case NI_QTYPE_IPV4ADDR:
1429 /* unsupported - should respond with unknown Qtype? */
1430 break;
1431 default:
1432 /*
1433 * XXX: We must return a reply with the ICMP6 code
1434 * `unknown Qtype' in this case. However we regard the case
1435 * as an FQDN query for backward compatibility.
1436 * Older versions set a random value to this field,
1437 * so it rarely varies in the defined qtypes.
1438 * But the mechanism is not reliable...
1439 * maybe we should obsolete older versions.
1440 */
1441 qtype = NI_QTYPE_FQDN;
1442 /* XXX will append an mbuf */
1443 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1444 oldfqdn++;
1445 break;
1446 }
1447
1448 /* allocate an mbuf to reply. */
1449 MGETHDR(n, M_DONTWAIT, m->m_type); /* MAC-OK */
1450 if (n == NULL) {
1451 m_freem(m);
1452 if (ifp != NULL)
1453 ifnet_release(ifp);
1454 return (NULL);
1455 }
1456 M_COPY_PKTHDR(n, m); /* just for recvif */
1457 if (replylen > MHLEN) {
1458 if (replylen > MCLBYTES) {
1459 /*
1460 * XXX: should we try to allocate more? But MCLBYTES
1461 * is probably much larger than IPV6_MMTU...
1462 */
1463 goto bad;
1464 }
1465 MCLGET(n, M_DONTWAIT);
1466 if ((n->m_flags & M_EXT) == 0) {
1467 goto bad;
1468 }
1469 }
1470 n->m_pkthdr.len = n->m_len = replylen;
1471
1472 /* copy mbuf header and IPv6 + Node Information base headers */
1473 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1474 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1475 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1476
1477 /* qtype dependent procedure */
1478 switch (qtype) {
1479 case NI_QTYPE_NOOP:
1480 nni6->ni_code = ICMP6_NI_SUCCESS;
1481 nni6->ni_flags = 0;
1482 break;
1483 case NI_QTYPE_SUPTYPES:
1484 {
1485 u_int32_t v;
1486 nni6->ni_code = ICMP6_NI_SUCCESS;
1487 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1488 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1489 v = (u_int32_t)htonl(0x0000000f);
1490 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1491 break;
1492 }
1493 case NI_QTYPE_FQDN:
1494 nni6->ni_code = ICMP6_NI_SUCCESS;
1495 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1496 sizeof(struct ip6_hdr) +
1497 sizeof(struct icmp6_nodeinfo));
1498 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1499 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1500 /*
1501 * XXX do we really have FQDN in variable "hostname"?
1502 */
1503 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1504 if (n->m_next == NULL)
1505 goto bad;
1506 /* XXX we assume that n->m_next is not a chain */
1507 if (n->m_next->m_next != NULL)
1508 goto bad;
1509 n->m_pkthdr.len += n->m_next->m_len;
1510 break;
1511 case NI_QTYPE_NODEADDR:
1512 {
1513 int lenlim, copied;
1514
1515 nni6->ni_code = ICMP6_NI_SUCCESS;
1516 n->m_pkthdr.len = n->m_len =
1517 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1518 lenlim = M_TRAILINGSPACE(n);
1519 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1520 /* XXX: reset mbuf length */
1521 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1522 sizeof(struct icmp6_nodeinfo) + copied;
1523 break;
1524 }
1525 default:
1526 break; /* XXX impossible! */
1527 }
1528
1529 nni6->ni_type = ICMP6_NI_REPLY;
1530 m_freem(m);
1531 if (ifp != NULL)
1532 ifnet_release(ifp);
1533 return (n);
1534
1535 bad:
1536 m_freem(m);
1537 if (n)
1538 m_freem(n);
1539 if (ifp != NULL)
1540 ifnet_release(ifp);
1541 return (NULL);
1542 }
1543 #undef hostnamelen
1544
1545 /*
1546 * make a mbuf with DNS-encoded string. no compression support.
1547 *
1548 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1549 * treated as truncated name (two \0 at the end). this is a wild guess.
1550 */
1551 static struct mbuf *
1552 ni6_nametodns(name, namelen, old)
1553 const char *name;
1554 int namelen;
1555 int old; /* return pascal string if non-zero */
1556 {
1557 struct mbuf *m;
1558 char *cp, *ep;
1559 const char *p, *q;
1560 int i, len, nterm;
1561
1562 if (old)
1563 len = namelen + 1;
1564 else
1565 len = MCLBYTES;
1566
1567 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1568 MGET(m, M_DONTWAIT, MT_DATA);
1569 if (m && len > MLEN) {
1570 MCLGET(m, M_DONTWAIT);
1571 if ((m->m_flags & M_EXT) == 0)
1572 goto fail;
1573 }
1574 if (!m)
1575 goto fail;
1576 m->m_next = NULL;
1577
1578 if (old) {
1579 m->m_len = len;
1580 *mtod(m, char *) = namelen;
1581 bcopy(name, mtod(m, char *) + 1, namelen);
1582 return m;
1583 } else {
1584 m->m_len = 0;
1585 cp = mtod(m, char *);
1586 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1587
1588 /* if not certain about my name, return empty buffer */
1589 if (namelen == 0)
1590 return m;
1591
1592 /*
1593 * guess if it looks like shortened hostname, or FQDN.
1594 * shortened hostname needs two trailing "\0".
1595 */
1596 i = 0;
1597 for (p = name; p < name + namelen; p++) {
1598 if (*p && *p == '.')
1599 i++;
1600 }
1601 if (i < 2)
1602 nterm = 2;
1603 else
1604 nterm = 1;
1605
1606 p = name;
1607 while (cp < ep && p < name + namelen) {
1608 i = 0;
1609 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1610 i++;
1611 /* result does not fit into mbuf */
1612 if (cp + i + 1 >= ep)
1613 goto fail;
1614 /*
1615 * DNS label length restriction, RFC1035 page 8.
1616 * "i == 0" case is included here to avoid returning
1617 * 0-length label on "foo..bar".
1618 */
1619 if (i <= 0 || i >= 64)
1620 goto fail;
1621 *cp++ = i;
1622 bcopy(p, cp, i);
1623 cp += i;
1624 p = q;
1625 if (p < name + namelen && *p == '.')
1626 p++;
1627 }
1628 /* termination */
1629 if (cp + nterm >= ep)
1630 goto fail;
1631 while (nterm-- > 0)
1632 *cp++ = '\0';
1633 m->m_len = cp - mtod(m, char *);
1634 return m;
1635 }
1636
1637 panic("should not reach here");
1638 /* NOTREACHED */
1639
1640 fail:
1641 if (m)
1642 m_freem(m);
1643 return NULL;
1644 }
1645
1646 /*
1647 * check if two DNS-encoded string matches. takes care of truncated
1648 * form (with \0\0 at the end). no compression support.
1649 * XXX upper/lowercase match (see RFC2065)
1650 */
1651 static int
1652 ni6_dnsmatch(a, alen, b, blen)
1653 const char *a;
1654 int alen;
1655 const char *b;
1656 int blen;
1657 {
1658 const char *a0, *b0;
1659 int l;
1660
1661 /* simplest case - need validation? */
1662 if (alen == blen && bcmp(a, b, alen) == 0)
1663 return 1;
1664
1665 a0 = a;
1666 b0 = b;
1667
1668 /* termination is mandatory */
1669 if (alen < 2 || blen < 2)
1670 return 0;
1671 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1672 return 0;
1673 alen--;
1674 blen--;
1675
1676 while (a - a0 < alen && b - b0 < blen) {
1677 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1678 return 0;
1679
1680 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1681 return 0;
1682 /* we don't support compression yet */
1683 if (a[0] >= 64 || b[0] >= 64)
1684 return 0;
1685
1686 /* truncated case */
1687 if (a[0] == 0 && a - a0 == alen - 1)
1688 return 1;
1689 if (b[0] == 0 && b - b0 == blen - 1)
1690 return 1;
1691 if (a[0] == 0 || b[0] == 0)
1692 return 0;
1693
1694 if (a[0] != b[0])
1695 return 0;
1696 l = a[0];
1697 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1698 return 0;
1699 if (bcmp(a + 1, b + 1, l) != 0)
1700 return 0;
1701
1702 a += 1 + l;
1703 b += 1 + l;
1704 }
1705
1706 if (a - a0 == alen && b - b0 == blen)
1707 return 1;
1708 else
1709 return 0;
1710 }
1711
1712 /*
1713 * calculate the number of addresses to be returned in the node info reply.
1714 */
1715 static int
1716 ni6_addrs(ni6, ifpp, subj)
1717 struct icmp6_nodeinfo *ni6;
1718 struct ifnet **ifpp;
1719 char *subj;
1720 {
1721 struct ifnet *ifp;
1722 struct in6_ifaddr *ifa6;
1723 struct ifaddr *ifa;
1724 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
1725 int addrs = 0, addrsofif, iffound = 0;
1726 int niflags = ni6->ni_flags;
1727
1728 if (ifpp != NULL)
1729 *ifpp = NULL;
1730
1731 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1732 switch (ni6->ni_code) {
1733 case ICMP6_NI_SUBJ_IPV6:
1734 if (subj == NULL) /* must be impossible... */
1735 return(0);
1736 subj_ip6 = (struct sockaddr_in6 *)(void *)subj;
1737 break;
1738 default:
1739 /*
1740 * XXX: we only support IPv6 subject address for
1741 * this Qtype.
1742 */
1743 return (0);
1744 }
1745 }
1746
1747 ifnet_head_lock_shared();
1748 TAILQ_FOREACH(ifp, &ifnet_head, if_list) {
1749 addrsofif = 0;
1750 ifnet_lock_shared(ifp);
1751 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1752 {
1753 IFA_LOCK(ifa);
1754 if (ifa->ifa_addr->sa_family != AF_INET6) {
1755 IFA_UNLOCK(ifa);
1756 continue;
1757 }
1758 ifa6 = (struct in6_ifaddr *)ifa;
1759
1760 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1761 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
1762 &ifa6->ia_addr.sin6_addr))
1763 iffound = 1;
1764
1765 /*
1766 * IPv4-mapped addresses can only be returned by a
1767 * Node Information proxy, since they represent
1768 * addresses of IPv4-only nodes, which perforce do
1769 * not implement this protocol.
1770 * [icmp-name-lookups-07, Section 5.4]
1771 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1772 * this function at this moment.
1773 */
1774
1775 /* What do we have to do about ::1? */
1776 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1777 case IPV6_ADDR_SCOPE_LINKLOCAL:
1778 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) {
1779 IFA_UNLOCK(ifa);
1780 continue;
1781 }
1782 break;
1783 case IPV6_ADDR_SCOPE_SITELOCAL:
1784 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) {
1785 IFA_UNLOCK(ifa);
1786 continue;
1787 }
1788 break;
1789 case IPV6_ADDR_SCOPE_GLOBAL:
1790 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) {
1791 IFA_UNLOCK(ifa);
1792 continue;
1793 }
1794 break;
1795 default:
1796 IFA_UNLOCK(ifa);
1797 continue;
1798 }
1799
1800 /*
1801 * check if anycast is okay.
1802 * XXX: just experimental. not in the spec.
1803 */
1804 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1805 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) {
1806 IFA_UNLOCK(ifa);
1807 continue; /* we need only unicast addresses */
1808 }
1809 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1810 (icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
1811 IFA_UNLOCK(ifa);
1812 continue;
1813 }
1814 addrsofif++; /* count the address */
1815 IFA_UNLOCK(ifa);
1816 }
1817 ifnet_lock_done(ifp);
1818 if (iffound) {
1819 if (ifpp != NULL) {
1820 *ifpp = ifp;
1821 ifnet_reference(ifp);
1822 }
1823 ifnet_head_done();
1824 return(addrsofif);
1825 }
1826
1827 addrs += addrsofif;
1828 }
1829 ifnet_head_done();
1830
1831 return (addrs);
1832 }
1833
1834 static int
1835 ni6_store_addrs(ni6, nni6, ifp0, resid)
1836 struct icmp6_nodeinfo *ni6, *nni6;
1837 struct ifnet *ifp0;
1838 int resid;
1839 {
1840 struct ifnet *ifp = ifp0;
1841 struct in6_ifaddr *ifa6;
1842 struct ifaddr *ifa;
1843 struct ifnet *ifp_dep = NULL;
1844 int copied = 0, allow_deprecated = 0;
1845 u_char *cp = (u_char *)(nni6 + 1);
1846 int niflags = ni6->ni_flags;
1847 u_int32_t ltime;
1848 uint64_t now = net_uptime();
1849
1850 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1851 return (0); /* needless to copy */
1852
1853 again:
1854
1855 ifnet_head_lock_shared();
1856 if (ifp == NULL)
1857 ifp = TAILQ_FIRST(&ifnet_head);
1858
1859 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
1860 ifnet_lock_shared(ifp);
1861 for (ifa = ifp->if_addrlist.tqh_first; ifa;
1862 ifa = ifa->ifa_list.tqe_next) {
1863 struct in6_addrlifetime_i *lt;
1864
1865 IFA_LOCK(ifa);
1866 if (ifa->ifa_addr->sa_family != AF_INET6) {
1867 IFA_UNLOCK(ifa);
1868 continue;
1869 }
1870 ifa6 = (struct in6_ifaddr *)ifa;
1871
1872 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
1873 allow_deprecated == 0) {
1874 /*
1875 * prefererred address should be put before
1876 * deprecated addresses.
1877 */
1878
1879 /* record the interface for later search */
1880 if (ifp_dep == NULL)
1881 ifp_dep = ifp;
1882
1883 IFA_UNLOCK(ifa);
1884 continue;
1885 } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
1886 allow_deprecated != 0) {
1887 IFA_UNLOCK(ifa);
1888 continue; /* we now collect deprecated addrs */
1889 }
1890 /* What do we have to do about ::1? */
1891 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1892 case IPV6_ADDR_SCOPE_LINKLOCAL:
1893 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) {
1894 IFA_UNLOCK(ifa);
1895 continue;
1896 }
1897 break;
1898 case IPV6_ADDR_SCOPE_SITELOCAL:
1899 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) {
1900 IFA_UNLOCK(ifa);
1901 continue;
1902 }
1903 break;
1904 case IPV6_ADDR_SCOPE_GLOBAL:
1905 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) {
1906 IFA_UNLOCK(ifa);
1907 continue;
1908 }
1909 break;
1910 default:
1911 IFA_UNLOCK(ifa);
1912 continue;
1913 }
1914
1915 /*
1916 * check if anycast is okay.
1917 * XXX: just experimental. not in the spec.
1918 */
1919 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1920 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) {
1921 IFA_UNLOCK(ifa);
1922 continue;
1923 }
1924 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1925 (icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
1926 IFA_UNLOCK(ifa);
1927 continue;
1928 }
1929
1930 /* now we can copy the address */
1931 if (resid < sizeof(struct in6_addr) +
1932 sizeof(u_int32_t)) {
1933 IFA_UNLOCK(ifa);
1934 /*
1935 * We give up much more copy.
1936 * Set the truncate flag and return.
1937 */
1938 nni6->ni_flags |=
1939 NI_NODEADDR_FLAG_TRUNCATE;
1940 ifnet_lock_done(ifp);
1941 ifnet_head_done();
1942 return(copied);
1943 }
1944
1945 /*
1946 * Set the TTL of the address.
1947 * The TTL value should be one of the following
1948 * according to the specification:
1949 *
1950 * 1. The remaining lifetime of a DHCP lease on the
1951 * address, or
1952 * 2. The remaining Valid Lifetime of a prefix from
1953 * which the address was derived through Stateless
1954 * Autoconfiguration.
1955 *
1956 * Note that we currently do not support stateful
1957 * address configuration by DHCPv6, so the former
1958 * case can't happen.
1959 */
1960 lt = &ifa6->ia6_lifetime;
1961 if (lt->ia6ti_expire == 0) {
1962 ltime = ND6_INFINITE_LIFETIME;
1963 } else {
1964 if (lt->ia6ti_expire > now)
1965 ltime = htonl(lt->ia6ti_expire - now);
1966 else
1967 ltime = 0;
1968 }
1969
1970 bcopy(&ltime, cp, sizeof(u_int32_t));
1971 cp += sizeof(u_int32_t);
1972
1973 /* copy the address itself */
1974 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1975 sizeof(struct in6_addr));
1976 /* XXX: KAME link-local hack; remove ifindex */
1977 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr))
1978 ((struct in6_addr *)(void *)cp)->s6_addr16[1] = 0;
1979 cp += sizeof(struct in6_addr);
1980
1981 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1982 copied += (sizeof(struct in6_addr) +
1983 sizeof(u_int32_t));
1984 IFA_UNLOCK(ifa);
1985 }
1986 ifnet_lock_done(ifp);
1987 if (ifp0) /* we need search only on the specified IF */
1988 break;
1989 }
1990 ifnet_head_done();
1991
1992 if (allow_deprecated == 0 && ifp_dep != NULL) {
1993 ifp = ifp_dep;
1994 allow_deprecated = 1;
1995
1996 goto again;
1997 }
1998
1999 return(copied);
2000 }
2001
2002 /*
2003 * XXX almost dup'ed code with rip6_input.
2004 */
2005 static int
2006 icmp6_rip6_input(mp, off)
2007 struct mbuf **mp;
2008 int off;
2009 {
2010 struct mbuf *m = *mp;
2011 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2012 struct in6pcb *in6p;
2013 struct in6pcb *last = NULL;
2014 struct sockaddr_in6 rip6src;
2015 struct icmp6_hdr *icmp6;
2016 struct mbuf *opts = NULL;
2017 int ret = 0;
2018 struct ifnet *ifp = m->m_pkthdr.rcvif;
2019
2020 #ifndef PULLDOWN_TEST
2021 /* this is assumed to be safe. */
2022 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
2023 #else
2024 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
2025 if (icmp6 == NULL) {
2026 /* m is already reclaimed */
2027 return IPPROTO_DONE;
2028 }
2029 #endif
2030
2031 /*
2032 * XXX: the address may have embedded scope zone ID, which should be
2033 * hidden from applications.
2034 */
2035 bzero(&rip6src, sizeof(rip6src));
2036 rip6src.sin6_family = AF_INET6;
2037 rip6src.sin6_len = sizeof(struct sockaddr_in6);
2038 rip6src.sin6_addr = ip6->ip6_src;
2039 if (sa6_recoverscope(&rip6src, TRUE))
2040 return (IPPROTO_DONE);
2041
2042 lck_rw_lock_shared(ripcbinfo.ipi_lock);
2043 LIST_FOREACH(in6p, &ripcb, inp_list)
2044 {
2045 if ((in6p->inp_vflag & INP_IPV6) == 0)
2046 continue;
2047 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
2048 continue;
2049 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
2050 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
2051 continue;
2052 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
2053 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
2054 continue;
2055 if (in6p->in6p_icmp6filt
2056 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
2057 in6p->in6p_icmp6filt))
2058 continue;
2059
2060 if (inp_restricted(in6p, ifp))
2061 continue;
2062
2063 if (ifp != NULL && IFNET_IS_CELLULAR(ifp) &&
2064 (in6p->in6p_flags & INP_NO_IFT_CELLULAR))
2065 continue;
2066
2067 if (last) {
2068 struct mbuf *n;
2069 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
2070 if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
2071 (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
2072 (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) {
2073 ret = ip6_savecontrol(last, n, &opts);
2074 if (ret != 0) {
2075 m_freem(n);
2076 m_freem(opts);
2077 last = in6p;
2078 continue;
2079 }
2080 }
2081 /* strip intermediate headers */
2082 m_adj(n, off);
2083 so_recv_data_stat(last->in6p_socket, m, 0);
2084 if (sbappendaddr(&last->in6p_socket->so_rcv,
2085 (struct sockaddr *)&rip6src,
2086 n, opts, NULL) != 0) {
2087 sorwakeup(last->in6p_socket);
2088 }
2089 opts = NULL;
2090 }
2091 }
2092 last = in6p;
2093 }
2094 if (last) {
2095 if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
2096 (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
2097 (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) {
2098 ret = ip6_savecontrol(last, m, &opts);
2099 if (ret != 0) {
2100 goto error;
2101 }
2102 }
2103 /* strip intermediate headers */
2104 m_adj(m, off);
2105 so_recv_data_stat(last->in6p_socket, m, 0);
2106 if (sbappendaddr(&last->in6p_socket->so_rcv,
2107 (struct sockaddr *)&rip6src, m, opts, NULL) != 0) {
2108 sorwakeup(last->in6p_socket);
2109 }
2110 } else {
2111 goto error;
2112 }
2113 lck_rw_done(ripcbinfo.ipi_lock);
2114 return IPPROTO_DONE;
2115
2116 error:
2117 lck_rw_done(ripcbinfo.ipi_lock);
2118 m_freem(m);
2119 m_freem(opts);
2120 ip6stat.ip6s_delivered--;
2121 return IPPROTO_DONE;
2122 }
2123
2124 /*
2125 * Reflect the ip6 packet back to the source.
2126 * OFF points to the icmp6 header, counted from the top of the mbuf.
2127 */
2128 void
2129 icmp6_reflect(m, off)
2130 struct mbuf *m;
2131 size_t off;
2132 {
2133 struct mbuf *m_ip6hdr = m;
2134 struct ip6_hdr *ip6;
2135 struct icmp6_hdr *icmp6;
2136 struct in6_ifaddr *ia;
2137 struct in6_addr t, src_storage, *src = 0;
2138 int plen;
2139 int type, code;
2140 struct ifnet *outif = NULL;
2141 struct sockaddr_in6 sa6_src, sa6_dst;
2142 struct nd_ifinfo *ndi;
2143 u_int32_t oflow;
2144 struct ip6_out_args ip6oa = { IFSCOPE_NONE, { 0 },
2145 IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR, 0 };
2146
2147 if (!(m->m_pkthdr.pkt_flags & PKTF_LOOP) && m->m_pkthdr.rcvif != NULL) {
2148 ip6oa.ip6oa_boundif = m->m_pkthdr.rcvif->if_index;
2149 ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
2150 }
2151
2152 /* too short to reflect */
2153 if (off < sizeof(struct ip6_hdr)) {
2154 nd6log((LOG_DEBUG,
2155 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2156 (u_int32_t)off, (u_int32_t)sizeof(struct ip6_hdr),
2157 __FILE__, __LINE__));
2158 goto bad;
2159 }
2160
2161 /*
2162 * If there are extra headers between IPv6 and ICMPv6, strip
2163 * off that header first.
2164 */
2165 if (off > sizeof(struct ip6_hdr)) {
2166 size_t l;
2167 struct ip6_hdr nip6;
2168
2169 l = off - sizeof(struct ip6_hdr);
2170 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2171 m_adj(m, l);
2172 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2173 if (m->m_len < l) {
2174 if ((m_ip6hdr = m_pulldown(m, 0, l, NULL)) == NULL)
2175 return;
2176 }
2177 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2178 } else /* off == sizeof(struct ip6_hdr) */ {
2179 size_t l;
2180 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2181 if (m->m_len < l) {
2182 if ((m_ip6hdr = m_pulldown(m, 0, l, NULL)) == NULL)
2183 return;
2184 }
2185 }
2186 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
2187 ip6 = mtod(m_ip6hdr, struct ip6_hdr *);
2188 ip6->ip6_nxt = IPPROTO_ICMPV6;
2189 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
2190 type = icmp6->icmp6_type; /* keep type for statistics */
2191 code = icmp6->icmp6_code; /* ditto. */
2192
2193 t = ip6->ip6_dst;
2194 /*
2195 * ip6_input() drops a packet if its src is multicast.
2196 * So, the src is never multicast.
2197 */
2198 ip6->ip6_dst = ip6->ip6_src;
2199
2200 /*
2201 * XXX: make sure to embed scope zone information, using
2202 * already embedded IDs or the received interface (if any).
2203 * Note that rcvif may be NULL.
2204 */
2205 bzero(&sa6_src, sizeof(sa6_src));
2206 sa6_src.sin6_family = AF_INET6;
2207 sa6_src.sin6_len = sizeof(sa6_src);
2208 sa6_src.sin6_addr = ip6->ip6_dst;
2209 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
2210 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL, NULL);
2211 bzero(&sa6_dst, sizeof(sa6_dst));
2212 sa6_dst.sin6_family = AF_INET6;
2213 sa6_dst.sin6_len = sizeof(sa6_dst);
2214 sa6_dst.sin6_addr = t;
2215 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
2216 in6_embedscope(&t, &sa6_dst, NULL, NULL, NULL);
2217
2218 /*
2219 * If the incoming packet was addressed directly to us(i.e. unicast),
2220 * use dst as the src for the reply.
2221 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
2222 * (for example) when we encounter an error while forwarding procedure
2223 * destined to a duplicated address of ours.
2224 * Note that ip6_getdstifaddr() may fail if we are in an error handling
2225 * procedure of an outgoing packet of our own, in which case we need
2226 * to search in the ifaddr list.
2227 */
2228 lck_rw_lock_shared(&in6_ifaddr_rwlock);
2229 for (ia = in6_ifaddrs; ia; ia = ia->ia_next) {
2230 IFA_LOCK(&ia->ia_ifa);
2231 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
2232 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2233 IFA_UNLOCK(&ia->ia_ifa);
2234 src = &t;
2235 break;
2236 }
2237 IFA_UNLOCK(&ia->ia_ifa);
2238 }
2239 lck_rw_done(&in6_ifaddr_rwlock);
2240 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) &&
2241 ((m->m_flags & M_LOOP) || (m->m_pkthdr.pkt_flags & PKTF_LOOP))) {
2242 /*
2243 * This is the case if the dst is our link-local address
2244 * and the sender is also ourselves. Here we test for both
2245 * M_LOOP and PKTF_LOOP, since the former may have been set
2246 * in ip6_output() and that we get here as part of callling
2247 * ip6_process_hopopts(). See comments in <sys/mbuf.h>
2248 */
2249 src = &t;
2250 }
2251
2252 if (src == NULL) {
2253 int e;
2254 struct sockaddr_in6 sin6;
2255 struct route_in6 ro;
2256
2257 /*
2258 * This case matches to multicasts, our anycast, or unicasts
2259 * that we do not own. Select a source address based on the
2260 * source address of the erroneous packet.
2261 */
2262 bzero(&sin6, sizeof(sin6));
2263 sin6.sin6_family = AF_INET6;
2264 sin6.sin6_len = sizeof(sin6);
2265 sin6.sin6_addr = ip6->ip6_dst; /* zone ID should be embedded */
2266
2267 bzero(&ro, sizeof(ro));
2268 /*
2269 * in6_selectsrc() might return outif with its reference held
2270 * even in the error case, so we always need to release it
2271 * if non-NULL.
2272 */
2273 src = in6_selectsrc(&sin6, NULL, NULL, &ro, &outif,
2274 &src_storage, ip6oa.ip6oa_boundif, &e);
2275 ROUTE_RELEASE(&ro);
2276 if (src == NULL) {
2277 nd6log((LOG_DEBUG,
2278 "icmp6_reflect: source can't be determined: "
2279 "dst=%s, error=%d\n",
2280 ip6_sprintf(&sa6_src.sin6_addr), e));
2281 goto bad;
2282 }
2283 }
2284 oflow = ip6->ip6_flow; /* Save for later */
2285 ip6->ip6_src = *src;
2286 ip6->ip6_flow = 0;
2287 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2288 ip6->ip6_vfc |= IPV6_VERSION;
2289 if (icmp6->icmp6_type == ICMP6_ECHO_REPLY && icmp6->icmp6_code == 0) {
2290 ip6->ip6_flow |= (oflow & htonl(0x0ff00000));
2291 }
2292 ip6->ip6_nxt = IPPROTO_ICMPV6;
2293 lck_rw_lock_shared(nd_if_rwlock);
2294 if (outif != NULL && (ndi = ND_IFINFO(outif)) != NULL &&
2295 ndi->initialized) {
2296 lck_mtx_lock(&ndi->lock);
2297 ip6->ip6_hlim = ndi->chlim;
2298 lck_mtx_unlock(&ndi->lock);
2299 }
2300 if (m->m_pkthdr.rcvif != NULL &&
2301 (ndi = ND_IFINFO(m->m_pkthdr.rcvif)) != NULL &&
2302 ndi->initialized) {
2303 /* XXX: This may not be the outgoing interface */
2304 lck_mtx_lock(&ndi->lock);
2305 ip6->ip6_hlim = ndi->chlim;
2306 lck_mtx_unlock(&ndi->lock);
2307 } else {
2308 ip6->ip6_hlim = ip6_defhlim;
2309 }
2310 lck_rw_done(nd_if_rwlock);
2311 /* Use the same traffic class as in the request to match IPv4 */
2312 icmp6->icmp6_cksum = 0;
2313 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2314 sizeof(struct ip6_hdr), plen);
2315
2316 /*
2317 * XXX option handling
2318 */
2319
2320 m->m_flags &= ~(M_BCAST|M_MCAST);
2321 #if IPSEC
2322 /* Don't lookup socket */
2323 if (ipsec_bypass == 0)
2324 (void)ipsec_setsocket(m, NULL);
2325 #endif /*IPSEC*/
2326
2327 if (outif != NULL) {
2328 ifnet_release(outif);
2329 outif = NULL;
2330 }
2331 m->m_pkthdr.rcvif = NULL;
2332 m->m_pkthdr.csum_data = 0;
2333 m->m_pkthdr.csum_flags = 0;
2334 ip6_output(m, NULL, NULL, IPV6_OUTARGS, NULL, &outif, &ip6oa);
2335 if (outif != NULL) {
2336 icmp6_ifoutstat_inc(outif, type, code);
2337 ifnet_release(outif);
2338 }
2339 return;
2340
2341 bad:
2342 m_freem(m);
2343 if (outif != NULL)
2344 ifnet_release(outif);
2345 return;
2346 }
2347
2348 static const char *
2349 icmp6_redirect_diag(src6, dst6, tgt6)
2350 struct in6_addr *src6;
2351 struct in6_addr *dst6;
2352 struct in6_addr *tgt6;
2353 {
2354 static char buf[1024];
2355 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2356 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
2357 return buf;
2358 }
2359
2360 void
2361 icmp6_redirect_input(m, off)
2362 struct mbuf *m;
2363 int off;
2364 {
2365 struct ifnet *ifp = m->m_pkthdr.rcvif;
2366 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2367 struct nd_redirect *nd_rd;
2368 int icmp6len = ntohs(ip6->ip6_plen);
2369 char *lladdr = NULL;
2370 int lladdrlen = 0;
2371 u_char *redirhdr = NULL;
2372 int redirhdrlen = 0;
2373 struct rtentry *rt = NULL;
2374 int is_router;
2375 int is_onlink;
2376 struct in6_addr src6 = ip6->ip6_src;
2377 struct in6_addr redtgt6;
2378 struct in6_addr reddst6;
2379 union nd_opts ndopts;
2380
2381 if (!m || !ifp)
2382 return;
2383
2384 /*
2385 * If we are an advertising router on this interface,
2386 * don't update route by icmp6 redirect.
2387 */
2388 if (ifp->if_eflags & IFEF_IPV6_ROUTER)
2389 goto freeit;
2390 if (!icmp6_rediraccept)
2391 goto freeit;
2392
2393 #ifndef PULLDOWN_TEST
2394 IP6_EXTHDR_CHECK(m, off, icmp6len, return);
2395 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2396 #else
2397 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2398 if (nd_rd == NULL) {
2399 icmp6stat.icp6s_tooshort++;
2400 return;
2401 }
2402 #endif
2403 redtgt6 = nd_rd->nd_rd_target;
2404 reddst6 = nd_rd->nd_rd_dst;
2405
2406 if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) ||
2407 in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) {
2408 goto freeit;
2409 }
2410
2411 /* validation */
2412 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2413 nd6log((LOG_ERR,
2414 "ICMP6 redirect sent from %s rejected; "
2415 "must be from linklocal\n", ip6_sprintf(&src6)));
2416 goto bad;
2417 }
2418 if (ip6->ip6_hlim != 255) {
2419 nd6log((LOG_ERR,
2420 "ICMP6 redirect sent from %s rejected; "
2421 "hlim=%d (must be 255)\n",
2422 ip6_sprintf(&src6), ip6->ip6_hlim));
2423 goto bad;
2424 }
2425 {
2426 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2427 struct sockaddr_in6 sin6;
2428 struct in6_addr *gw6;
2429
2430 bzero(&sin6, sizeof(sin6));
2431 sin6.sin6_family = AF_INET6;
2432 sin6.sin6_len = sizeof(struct sockaddr_in6);
2433 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
2434 rt = rtalloc1_scoped((struct sockaddr *)&sin6, 0, 0, ifp->if_index);
2435 if (rt) {
2436 RT_LOCK(rt);
2437 if (rt->rt_gateway == NULL ||
2438 rt->rt_gateway->sa_family != AF_INET6) {
2439 nd6log((LOG_ERR,
2440 "ICMP6 redirect rejected; no route "
2441 "with inet6 gateway found for redirect dst: %s\n",
2442 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2443 RT_UNLOCK(rt);
2444 rtfree(rt);
2445 goto bad;
2446 }
2447
2448 gw6 = &(((struct sockaddr_in6 *)(void *)
2449 rt->rt_gateway)->sin6_addr);
2450 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2451 nd6log((LOG_ERR,
2452 "ICMP6 redirect rejected; "
2453 "not equal to gw-for-src=%s (must be same): "
2454 "%s\n",
2455 ip6_sprintf(gw6),
2456 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2457 RT_UNLOCK(rt);
2458 rtfree(rt);
2459 goto bad;
2460 }
2461 } else {
2462 nd6log((LOG_ERR,
2463 "ICMP6 redirect rejected; "
2464 "no route found for redirect dst: %s\n",
2465 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2466 goto bad;
2467 }
2468 RT_UNLOCK(rt);
2469 rtfree(rt);
2470 rt = NULL;
2471 }
2472 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2473 nd6log((LOG_ERR,
2474 "ICMP6 redirect rejected; "
2475 "redirect dst must be unicast: %s\n",
2476 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2477 goto bad;
2478 }
2479
2480 is_router = is_onlink = 0;
2481 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2482 is_router = 1; /* router case */
2483 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2484 is_onlink = 1; /* on-link destination case */
2485 if (!is_router && !is_onlink) {
2486 nd6log((LOG_ERR,
2487 "ICMP6 redirect rejected; "
2488 "neither router case nor onlink case: %s\n",
2489 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2490 goto bad;
2491 }
2492 /* validation passed */
2493
2494 icmp6len -= sizeof(*nd_rd);
2495 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2496 if (nd6_options(&ndopts) < 0) {
2497 nd6log((LOG_INFO, "icmp6_redirect_input: "
2498 "invalid ND option, rejected: %s\n",
2499 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2500 /* nd6_options have incremented stats */
2501 goto freeit;
2502 }
2503
2504 if (ndopts.nd_opts_tgt_lladdr) {
2505 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2506 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2507 }
2508
2509 if (ndopts.nd_opts_rh) {
2510 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2511 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2512 }
2513
2514 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2515 nd6log((LOG_INFO,
2516 "icmp6_redirect_input: lladdrlen mismatch for %s "
2517 "(if %d, icmp6 packet %d): %s\n",
2518 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
2519 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2520 goto bad;
2521 }
2522
2523 /* RFC 2461 8.3 */
2524 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2525 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2526
2527 if (!is_onlink) { /* better router case. perform rtredirect. */
2528 /* perform rtredirect */
2529 struct sockaddr_in6 sdst;
2530 struct sockaddr_in6 sgw;
2531 struct sockaddr_in6 ssrc;
2532
2533 bzero(&sdst, sizeof(sdst));
2534 bzero(&sgw, sizeof(sgw));
2535 bzero(&ssrc, sizeof(ssrc));
2536 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2537 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2538 sizeof(struct sockaddr_in6);
2539 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2540 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2541 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2542 rtredirect(ifp, (struct sockaddr *)&sdst,
2543 (struct sockaddr *)&sgw, NULL, RTF_GATEWAY | RTF_HOST,
2544 (struct sockaddr *)&ssrc, NULL);
2545 }
2546 /* finally update cached route in each socket via pfctlinput */
2547 {
2548 struct sockaddr_in6 sdst;
2549
2550 bzero(&sdst, sizeof(sdst));
2551 sdst.sin6_family = AF_INET6;
2552 sdst.sin6_len = sizeof(struct sockaddr_in6);
2553 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2554
2555 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2556 #if IPSEC
2557 key_sa_routechange((struct sockaddr *)&sdst);
2558 #endif
2559 }
2560
2561 freeit:
2562 m_freem(m);
2563 return;
2564
2565 bad:
2566 icmp6stat.icp6s_badredirect++;
2567 m_freem(m);
2568 }
2569
2570 void
2571 icmp6_redirect_output(m0, rt)
2572 struct mbuf *m0;
2573 struct rtentry *rt;
2574 {
2575 struct ifnet *ifp; /* my outgoing interface */
2576 struct in6_addr ifp_ll6;
2577 struct in6_addr *router_ll6;
2578 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2579 struct mbuf *m = NULL; /* newly allocated one */
2580 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2581 struct nd_redirect *nd_rd;
2582 size_t maxlen;
2583 u_char *p;
2584 struct ifnet *outif = NULL;
2585 struct sockaddr_in6 src_sa;
2586 struct ip6_out_args ip6oa = { IFSCOPE_NONE, { 0 },
2587 IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR, 0 };
2588
2589 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2590
2591 if (rt != NULL)
2592 RT_LOCK(rt);
2593
2594 /* sanity check */
2595 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2596 goto fail;
2597
2598 /*
2599 * If we are not a router to begin with, or not an advertising
2600 * router on this interface, don't send icmp6 redirect.
2601 */
2602 if (!ip6_forwarding || !(ifp->if_eflags & IFEF_IPV6_ROUTER))
2603 goto fail;
2604
2605 /*
2606 * Address check:
2607 * the source address must identify a neighbor, and
2608 * the destination address must not be a multicast address
2609 * [RFC 2461, sec 8.2]
2610 */
2611 sip6 = mtod(m0, struct ip6_hdr *);
2612 bzero(&src_sa, sizeof(src_sa));
2613 src_sa.sin6_family = AF_INET6;
2614 src_sa.sin6_len = sizeof(src_sa);
2615 src_sa.sin6_addr = sip6->ip6_src;
2616 /* we don't currently use sin6_scope_id, but eventually use it */
2617 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src);
2618 RT_UNLOCK(rt);
2619 if (nd6_is_addr_neighbor(&src_sa, ifp, 0) == 0) {
2620 /* already unlocked */
2621 rt = NULL;
2622 goto fail;
2623 }
2624 RT_LOCK(rt);
2625 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2626 goto fail; /* what should we do here? */
2627
2628 /* rate limit */
2629 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2630 goto fail;
2631
2632 /*
2633 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2634 * we almost always ask for an mbuf cluster for simplicity.
2635 * (MHLEN < IPV6_MMTU is almost always true)
2636 */
2637 #if IPV6_MMTU >= MCLBYTES
2638 # error assumption failed about IPV6_MMTU and MCLBYTES
2639 #endif
2640 MGETHDR(m, M_DONTWAIT, MT_HEADER); /* MAC-OK */
2641 if (m && IPV6_MMTU >= MHLEN)
2642 MCLGET(m, M_DONTWAIT);
2643 if (!m)
2644 goto fail;
2645 m->m_pkthdr.rcvif = NULL;
2646 m->m_len = 0;
2647 maxlen = M_TRAILINGSPACE(m);
2648 maxlen = min(IPV6_MMTU, maxlen);
2649 /* just for safety */
2650 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2651 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2652 goto fail;
2653 }
2654
2655 {
2656 /* get ip6 linklocal address for ifp(my outgoing interface). */
2657 struct in6_ifaddr *ia;
2658 if ((ia = in6ifa_ifpforlinklocal(ifp,
2659 IN6_IFF_NOTREADY|
2660 IN6_IFF_ANYCAST)) == NULL)
2661 goto fail;
2662 IFA_LOCK(&ia->ia_ifa);
2663 ifp_ll6 = ia->ia_addr.sin6_addr;
2664 IFA_UNLOCK(&ia->ia_ifa);
2665 IFA_REMREF(&ia->ia_ifa);
2666 }
2667
2668 /* get ip6 linklocal address for the router. */
2669 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2670 struct sockaddr_in6 *sin6;
2671 sin6 = (struct sockaddr_in6 *)(void *)rt->rt_gateway;
2672 router_ll6 = &sin6->sin6_addr;
2673 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2674 router_ll6 = (struct in6_addr *)NULL;
2675 } else
2676 router_ll6 = (struct in6_addr *)NULL;
2677
2678 /* ip6 */
2679 ip6 = mtod(m, struct ip6_hdr *);
2680 ip6->ip6_flow = 0;
2681 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2682 ip6->ip6_vfc |= IPV6_VERSION;
2683 /* ip6->ip6_plen will be set later */
2684 ip6->ip6_nxt = IPPROTO_ICMPV6;
2685 ip6->ip6_hlim = 255;
2686 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2687 bcopy(&ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2688 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2689
2690 /* ND Redirect */
2691 nd_rd = (struct nd_redirect *)(ip6 + 1);
2692 nd_rd->nd_rd_type = ND_REDIRECT;
2693 nd_rd->nd_rd_code = 0;
2694 nd_rd->nd_rd_reserved = 0;
2695 if (rt->rt_flags & RTF_GATEWAY) {
2696 /*
2697 * nd_rd->nd_rd_target must be a link-local address in
2698 * better router cases.
2699 */
2700 if (!router_ll6)
2701 goto fail;
2702 bcopy(router_ll6, &nd_rd->nd_rd_target,
2703 sizeof(nd_rd->nd_rd_target));
2704 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2705 sizeof(nd_rd->nd_rd_dst));
2706 } else {
2707 /* make sure redtgt == reddst */
2708 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2709 sizeof(nd_rd->nd_rd_target));
2710 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2711 sizeof(nd_rd->nd_rd_dst));
2712 }
2713 RT_UNLOCK(rt);
2714 rt = NULL;
2715
2716 p = (u_char *)(nd_rd + 1);
2717
2718 if (!router_ll6)
2719 goto nolladdropt;
2720
2721 {
2722 /* target lladdr option */
2723 struct rtentry *rt_router = NULL;
2724 int len;
2725 struct sockaddr_dl *sdl;
2726 struct nd_opt_hdr *nd_opt;
2727 char *lladdr;
2728
2729 /* Callee returns a locked route upon success */
2730 rt_router = nd6_lookup(router_ll6, 0, ifp, 0);
2731 if (!rt_router)
2732 goto nolladdropt;
2733 RT_LOCK_ASSERT_HELD(rt_router);
2734 len = sizeof(*nd_opt) + ifp->if_addrlen;
2735 len = (len + 7) & ~7; /* round by 8 */
2736 /* safety check */
2737 if (len + (p - (u_char *)ip6) > maxlen) {
2738 RT_REMREF_LOCKED(rt_router);
2739 RT_UNLOCK(rt_router);
2740 goto nolladdropt;
2741 }
2742
2743 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2744 (rt_router->rt_flags & RTF_LLINFO) &&
2745 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2746 (sdl = (struct sockaddr_dl *)(void *)
2747 rt_router->rt_gateway) && sdl->sdl_alen) {
2748 nd_opt = (struct nd_opt_hdr *)p;
2749 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2750 nd_opt->nd_opt_len = len >> 3;
2751 lladdr = (char *)(nd_opt + 1);
2752 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2753 p += len;
2754 }
2755 RT_REMREF_LOCKED(rt_router);
2756 RT_UNLOCK(rt_router);
2757 }
2758
2759 nolladdropt:;
2760
2761 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2762
2763 /* just to be safe */
2764 #ifdef M_DECRYPTED /*not openbsd*/
2765 if (m0->m_flags & M_DECRYPTED)
2766 goto noredhdropt;
2767 #endif
2768 if (p - (u_char *)ip6 > maxlen)
2769 goto noredhdropt;
2770
2771 {
2772 /* redirected header option */
2773 int len;
2774 struct nd_opt_rd_hdr *nd_opt_rh;
2775
2776 /*
2777 * compute the maximum size for icmp6 redirect header option.
2778 * XXX room for auth header?
2779 */
2780 len = maxlen - (p - (u_char *)ip6);
2781 len &= ~7;
2782
2783 /* This is just for simplicity. */
2784 if (m0->m_pkthdr.len != m0->m_len) {
2785 if (m0->m_next) {
2786 m_freem(m0->m_next);
2787 m0->m_next = NULL;
2788 }
2789 m0->m_pkthdr.len = m0->m_len;
2790 }
2791
2792 /*
2793 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2794 * about padding/truncate rule for the original IP packet.
2795 * From the discussion on IPv6imp in Feb 1999, the consensus was:
2796 * - "attach as much as possible" is the goal
2797 * - pad if not aligned (original size can be guessed by original
2798 * ip6 header)
2799 * Following code adds the padding if it is simple enough,
2800 * and truncates if not.
2801 */
2802 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2803 panic("assumption failed in %s:%d\n", __FILE__, __LINE__);
2804
2805 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2806 /* not enough room, truncate */
2807 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2808 } else {
2809 /* enough room, pad or truncate */
2810 size_t extra;
2811
2812 extra = m0->m_pkthdr.len % 8;
2813 if (extra) {
2814 /* pad if easy enough, truncate if not */
2815 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2816 /* pad */
2817 m0->m_len += (8 - extra);
2818 m0->m_pkthdr.len += (8 - extra);
2819 } else {
2820 /* truncate */
2821 m0->m_pkthdr.len -= extra;
2822 m0->m_len -= extra;
2823 }
2824 }
2825 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2826 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2827 }
2828
2829 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2830 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2831 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2832 nd_opt_rh->nd_opt_rh_len = len >> 3;
2833 p += sizeof(*nd_opt_rh);
2834 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2835
2836 /* connect m0 to m */
2837 m->m_next = m0;
2838 m->m_pkthdr.len = m->m_len + m0->m_len;
2839 }
2840 noredhdropt:;
2841
2842 /* XXX: clear embedded link IDs in the inner header */
2843 in6_clearscope(&sip6->ip6_src);
2844 in6_clearscope(&sip6->ip6_dst);
2845 in6_clearscope(&nd_rd->nd_rd_target);
2846 in6_clearscope(&nd_rd->nd_rd_dst);
2847
2848 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2849
2850 nd_rd->nd_rd_cksum = 0;
2851 nd_rd->nd_rd_cksum
2852 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2853
2854 /* send the packet to outside... */
2855 #if IPSEC
2856 /* Don't lookup socket */
2857 if (ipsec_bypass == 0)
2858 (void)ipsec_setsocket(m, NULL);
2859 #endif /*IPSEC*/
2860
2861 ip6oa.ip6oa_boundif = ifp->if_index;
2862 ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
2863
2864 ip6_output(m, NULL, NULL, IPV6_OUTARGS, NULL, &outif, &ip6oa);
2865 if (outif) {
2866 icmp6_ifstat_inc(outif, ifs6_out_msg);
2867 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2868 ifnet_release(outif);
2869 }
2870 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2871
2872 return;
2873
2874 fail:
2875 if (rt != NULL)
2876 RT_UNLOCK(rt);
2877 if (m)
2878 m_freem(m);
2879 if (m0)
2880 m_freem(m0);
2881 }
2882
2883 /*
2884 * ICMPv6 socket option processing.
2885 */
2886 int
2887 icmp6_ctloutput(so, sopt)
2888 struct socket *so;
2889 struct sockopt *sopt;
2890 {
2891 int error = 0;
2892 int optlen;
2893 struct inpcb *inp = sotoinpcb(so);
2894 int level, op, optname;
2895
2896 if (sopt) {
2897 level = sopt->sopt_level;
2898 op = sopt->sopt_dir;
2899 optname = sopt->sopt_name;
2900 optlen = sopt->sopt_valsize;
2901 } else
2902 level = op = optname = optlen = 0;
2903
2904 if (level != IPPROTO_ICMPV6) {
2905 return EINVAL;
2906 }
2907
2908 switch (op) {
2909 case PRCO_SETOPT:
2910 switch (optname) {
2911 case ICMP6_FILTER:
2912 {
2913 struct icmp6_filter *p;
2914
2915 if (optlen != 0 && optlen != sizeof(*p)) {
2916 error = EMSGSIZE;
2917 break;
2918 }
2919 if (inp->in6p_icmp6filt == NULL) {
2920 error = EINVAL;
2921 break;
2922 }
2923
2924 if (optlen == 0) {
2925 /* According to RFC 3542, an installed filter can be
2926 * cleared by issuing a setsockopt for ICMP6_FILTER
2927 * with a zero length.
2928 */
2929 ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
2930 } else {
2931 error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen,
2932 optlen);
2933 }
2934 break;
2935 }
2936
2937 default:
2938 error = ENOPROTOOPT;
2939 break;
2940 }
2941 break;
2942
2943 case PRCO_GETOPT:
2944 switch (optname) {
2945 case ICMP6_FILTER:
2946 {
2947 if (inp->in6p_icmp6filt == NULL) {
2948 error = EINVAL;
2949 break;
2950 }
2951 error = sooptcopyout(sopt, inp->in6p_icmp6filt,
2952 min(sizeof(struct icmp6_filter), optlen));
2953 break;
2954 }
2955
2956 default:
2957 error = ENOPROTOOPT;
2958 break;
2959 }
2960 break;
2961 }
2962
2963 return(error);
2964 }
2965
2966 /*
2967 * ICMPv6 socket datagram option processing.
2968 */
2969 int
2970 icmp6_dgram_ctloutput(struct socket *so, struct sockopt *sopt)
2971 {
2972 if (kauth_cred_issuser(so->so_cred))
2973 return icmp6_ctloutput(so, sopt);
2974
2975 if (sopt->sopt_level == IPPROTO_ICMPV6) {
2976 switch (sopt->sopt_name) {
2977 case ICMP6_FILTER:
2978 return icmp6_ctloutput(so, sopt);
2979 default:
2980 return EPERM;
2981 }
2982 }
2983
2984 if (sopt->sopt_level != IPPROTO_IPV6)
2985 return EINVAL;
2986
2987 switch (sopt->sopt_name) {
2988 case IPV6_UNICAST_HOPS:
2989 case IPV6_CHECKSUM:
2990 case IPV6_V6ONLY:
2991 case IPV6_USE_MIN_MTU:
2992 case IPV6_RECVRTHDR:
2993 case IPV6_RECVPKTINFO:
2994 case IPV6_RECVHOPLIMIT:
2995 case IPV6_PATHMTU:
2996 case IPV6_PKTINFO:
2997 case IPV6_HOPLIMIT:
2998 case IPV6_HOPOPTS:
2999 case IPV6_DSTOPTS:
3000 case IPV6_MULTICAST_IF:
3001 case IPV6_MULTICAST_HOPS:
3002 case IPV6_MULTICAST_LOOP:
3003 case IPV6_JOIN_GROUP:
3004 case IPV6_LEAVE_GROUP:
3005 case IPV6_PORTRANGE:
3006 case IPV6_IPSEC_POLICY:
3007 case IPV6_RECVTCLASS:
3008 case IPV6_TCLASS:
3009 case IPV6_2292PKTOPTIONS:
3010 case IPV6_2292PKTINFO:
3011 case IPV6_2292HOPLIMIT:
3012 case IPV6_2292HOPOPTS:
3013 case IPV6_2292DSTOPTS:
3014 case IPV6_2292RTHDR:
3015 case IPV6_BOUND_IF:
3016 case IPV6_NO_IFT_CELLULAR:
3017
3018 return ip6_ctloutput(so, sopt);
3019
3020 default:
3021 return EPERM;
3022 }
3023 }
3024
3025 __private_extern__ int
3026 icmp6_dgram_send(struct socket *so, int flags, struct mbuf *m,
3027 struct sockaddr *nam, struct mbuf *control, struct proc *p)
3028 {
3029 #pragma unused(flags, p)
3030 int error = 0;
3031 struct inpcb *inp = sotoinpcb(so);
3032 struct sockaddr_in6 tmp;
3033 struct sockaddr_in6 *dst = (struct sockaddr_in6 *)(void *)nam;
3034 struct icmp6_hdr *icmp6;
3035
3036 if (inp == NULL || (inp->inp_flags2 & INP2_WANT_FLOW_DIVERT)) {
3037 error = (inp == NULL ? EINVAL : EPROTOTYPE);
3038 goto bad;
3039 }
3040
3041 if (kauth_cred_issuser(so->so_cred))
3042 return (rip6_output(m, so, SIN6(nam), control, 0));
3043
3044 /* always copy sockaddr to avoid overwrites */
3045 if (so->so_state & SS_ISCONNECTED) {
3046 if (nam != NULL) {
3047 error = EISCONN;
3048 goto bad;
3049 }
3050 /* XXX */
3051 bzero(&tmp, sizeof(tmp));
3052 tmp.sin6_family = AF_INET6;
3053 tmp.sin6_len = sizeof(struct sockaddr_in6);
3054 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
3055 sizeof(struct in6_addr));
3056 dst = &tmp;
3057 } else {
3058 if (nam == NULL) {
3059 error = ENOTCONN;
3060 goto bad;
3061 }
3062 tmp = *(struct sockaddr_in6 *)(void *)nam;
3063 dst = &tmp;
3064 }
3065
3066 /*
3067 * For an ICMPv6 packet, we should know its type and code
3068 */
3069 if (SOCK_PROTO(so) == IPPROTO_ICMPV6) {
3070 if (m->m_len < sizeof(struct icmp6_hdr) &&
3071 (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
3072 error = ENOBUFS;
3073 goto bad;
3074 }
3075 icmp6 = mtod(m, struct icmp6_hdr *);
3076
3077 /*
3078 * Allow only to send echo request and node information request
3079 * See RFC 2463 for Echo Request Message format
3080 */
3081 if ((icmp6->icmp6_type == ICMP6_ECHO_REQUEST &&
3082 icmp6->icmp6_code == 0) ||
3083 (icmp6->icmp6_type == ICMP6_NI_QUERY &&
3084 (icmp6->icmp6_code == ICMP6_NI_SUBJ_IPV6 ||
3085 icmp6->icmp6_code == ICMP6_NI_SUBJ_FQDN))) {
3086 /* Good */
3087 ;
3088 } else {
3089 error = EPERM;
3090 goto bad;
3091 }
3092 }
3093
3094 #if ENABLE_DEFAULT_SCOPE
3095 if (dst->sin6_scope_id == 0) { /* not change if specified */
3096 dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr);
3097 }
3098 #endif
3099
3100 return (rip6_output(m, so, dst, control, 0));
3101 bad:
3102 VERIFY(error != 0);
3103
3104 if (m != NULL)
3105 m_freem(m);
3106 if (control != NULL)
3107 m_freem(control);
3108
3109 return (error);
3110 }
3111
3112 /* Like rip6_attach but without root privilege enforcement */
3113 __private_extern__ int
3114 icmp6_dgram_attach(struct socket *so, int proto, struct proc *p)
3115 {
3116 struct inpcb *inp;
3117 int error;
3118
3119 inp = sotoinpcb(so);
3120 if (inp)
3121 panic("icmp6_dgram_attach");
3122
3123 if (proto != IPPROTO_ICMPV6)
3124 return EINVAL;
3125
3126 error = soreserve(so, rip_sendspace, rip_recvspace);
3127 if (error)
3128 return error;
3129 error = in_pcballoc(so, &ripcbinfo, p);
3130 if (error)
3131 return error;
3132 inp = (struct inpcb *)so->so_pcb;
3133 inp->inp_vflag |= INP_IPV6;
3134 inp->in6p_ip6_nxt = IPPROTO_ICMPV6;
3135 inp->in6p_hops = -1; /* use kernel default */
3136 inp->in6p_cksum = -1;
3137 MALLOC(inp->in6p_icmp6filt, struct icmp6_filter *,
3138 sizeof(struct icmp6_filter), M_PCB, M_WAITOK);
3139 if (inp->in6p_icmp6filt == NULL)
3140 return (ENOMEM);
3141 ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
3142 return 0;
3143 }
3144
3145
3146 /*
3147 * Perform rate limit check.
3148 * Returns 0 if it is okay to send the icmp6 packet.
3149 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
3150 * limitation.
3151 *
3152 * XXX per-destination/type check necessary?
3153 */
3154 static int
3155 icmp6_ratelimit(
3156 __unused const struct in6_addr *dst, /* not used at this moment */
3157 __unused const int type, /* not used at this moment */
3158 __unused const int code) /* not used at this moment */
3159 {
3160 int ret;
3161
3162 ret = 0; /* okay to send */
3163
3164 /* PPS limit */
3165 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
3166 icmp6errppslim)) {
3167 /* The packet is subject to rate limit */
3168 ret++;
3169 }
3170
3171 return ret;
3172 }
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