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1 /*
2 * Copyright (c) 2000-2014 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 #endif
135
136 #include <net/net_osdep.h>
137
138 #if NECP
139 #include <net/necp.h>
140 #endif
141
142 extern struct ip6protosw *ip6_protox[];
143
144 extern uint32_t rip_sendspace;
145 extern uint32_t rip_recvspace;
146
147 struct icmp6stat icmp6stat;
148
149 extern struct inpcbhead ripcb;
150 extern int icmp6errppslim;
151 extern int icmp6rappslim;
152 static int icmp6errpps_count = 0;
153 static int icmp6rapps_count = 0;
154 static struct timeval icmp6errppslim_last;
155 static struct timeval icmp6rappslim_last;
156 extern int icmp6_nodeinfo;
157 extern struct inpcbinfo ripcbinfo;
158
159 static void icmp6_errcount(struct icmp6errstat *, int, int);
160 static int icmp6_rip6_input(struct mbuf **, int);
161 static int icmp6_ratelimit(const struct in6_addr *, const int, const int);
162 static const char *icmp6_redirect_diag(struct in6_addr *,
163 struct in6_addr *, struct in6_addr *);
164 static struct mbuf *ni6_input(struct mbuf *, int);
165 static struct mbuf *ni6_nametodns(const char *, int, int);
166 static int ni6_dnsmatch(const char *, int, const char *, int);
167 static int ni6_addrs(struct icmp6_nodeinfo *,
168 struct ifnet **, char *);
169 static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
170 struct ifnet *, int);
171 static int icmp6_notify_error(struct mbuf *, int, int, int);
172
173
174
175 void
176 icmp6_init(struct ip6protosw *pp, struct domain *dp)
177 {
178 #pragma unused(dp)
179 static int icmp6_initialized = 0;
180
181 /* Also called from ip6_init() without pp */
182 VERIFY(pp == NULL ||
183 (pp->pr_flags & (PR_INITIALIZED|PR_ATTACHED)) == PR_ATTACHED);
184
185 /* This gets called by more than one protocols, so initialize once */
186 if (!icmp6_initialized) {
187 icmp6_initialized = 1;
188 mld_init();
189 }
190 }
191
192 static void
193 icmp6_errcount(stat, type, code)
194 struct icmp6errstat *stat;
195 int type, code;
196 {
197 switch (type) {
198 case ICMP6_DST_UNREACH:
199 switch (code) {
200 case ICMP6_DST_UNREACH_NOROUTE:
201 stat->icp6errs_dst_unreach_noroute++;
202 return;
203 case ICMP6_DST_UNREACH_ADMIN:
204 stat->icp6errs_dst_unreach_admin++;
205 return;
206 case ICMP6_DST_UNREACH_BEYONDSCOPE:
207 stat->icp6errs_dst_unreach_beyondscope++;
208 return;
209 case ICMP6_DST_UNREACH_ADDR:
210 stat->icp6errs_dst_unreach_addr++;
211 return;
212 case ICMP6_DST_UNREACH_NOPORT:
213 stat->icp6errs_dst_unreach_noport++;
214 return;
215 }
216 break;
217 case ICMP6_PACKET_TOO_BIG:
218 stat->icp6errs_packet_too_big++;
219 return;
220 case ICMP6_TIME_EXCEEDED:
221 switch (code) {
222 case ICMP6_TIME_EXCEED_TRANSIT:
223 stat->icp6errs_time_exceed_transit++;
224 return;
225 case ICMP6_TIME_EXCEED_REASSEMBLY:
226 stat->icp6errs_time_exceed_reassembly++;
227 return;
228 }
229 break;
230 case ICMP6_PARAM_PROB:
231 switch (code) {
232 case ICMP6_PARAMPROB_HEADER:
233 stat->icp6errs_paramprob_header++;
234 return;
235 case ICMP6_PARAMPROB_NEXTHEADER:
236 stat->icp6errs_paramprob_nextheader++;
237 return;
238 case ICMP6_PARAMPROB_OPTION:
239 stat->icp6errs_paramprob_option++;
240 return;
241 }
242 break;
243 case ND_REDIRECT:
244 stat->icp6errs_redirect++;
245 return;
246 }
247 stat->icp6errs_unknown++;
248 }
249
250 /*
251 * A wrapper function for icmp6_error() necessary when the erroneous packet
252 * may not contain enough scope zone information.
253 */
254 void
255 icmp6_error2(struct mbuf *m, int type, int code, int param,
256 struct ifnet *ifp)
257 {
258 struct ip6_hdr *ip6;
259
260 if (ifp == NULL)
261 return;
262
263 #ifndef PULLDOWN_TEST
264 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr),return );
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
273 ip6 = mtod(m, struct ip6_hdr *);
274
275 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
276 return;
277 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
278 return;
279
280 icmp6_error(m, type, code, param);
281 }
282
283 /*
284 * Generate an error packet of type error in response to bad IP6 packet.
285 */
286 void
287 icmp6_error(struct mbuf *m, int type, int code, int param)
288 {
289 struct ip6_hdr *oip6, *nip6;
290 struct icmp6_hdr *icmp6;
291 u_int preplen;
292 int off;
293 int nxt;
294
295 icmp6stat.icp6s_error++;
296
297 /* count per-type-code statistics */
298 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
299
300 #ifdef M_DECRYPTED /*not openbsd*/
301 if (m->m_flags & M_DECRYPTED) {
302 icmp6stat.icp6s_canterror++;
303 goto freeit;
304 }
305 #endif
306
307 #ifndef PULLDOWN_TEST
308 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), return);
309 #else
310 if (m->m_len < sizeof(struct ip6_hdr)) {
311 m = m_pullup(m, sizeof(struct ip6_hdr));
312 if (m == NULL)
313 return;
314 }
315 #endif
316 oip6 = mtod(m, struct ip6_hdr *);
317
318 /*
319 * If the destination address of the erroneous packet is a multicast
320 * address, or the packet was sent using link-layer multicast,
321 * we should basically suppress sending an error (RFC 2463, Section
322 * 2.4).
323 * We have two exceptions (the item e.2 in that section):
324 * - the Pakcet Too Big message can be sent for path MTU discovery.
325 * - the Parameter Problem Message that can be allowed an icmp6 error
326 * in the option type field. This check has been done in
327 * ip6_unknown_opt(), so we can just check the type and code.
328 */
329 if ((m->m_flags & (M_BCAST|M_MCAST) ||
330 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
331 (type != ICMP6_PACKET_TOO_BIG &&
332 (type != ICMP6_PARAM_PROB ||
333 code != ICMP6_PARAMPROB_OPTION)))
334 goto freeit;
335
336 /*
337 * RFC 2463, 2.4 (e.5): source address check.
338 * XXX: the case of anycast source?
339 */
340 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
341 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
342 goto freeit;
343
344 /*
345 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
346 * don't do it.
347 */
348 nxt = -1;
349 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
350 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
351 struct icmp6_hdr *icp;
352
353 #ifndef PULLDOWN_TEST
354 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), return);
355 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
356 #else
357 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
358 sizeof(*icp));
359 if (icp == NULL) {
360 icmp6stat.icp6s_tooshort++;
361 return;
362 }
363 #endif
364 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
365 icp->icmp6_type == ND_REDIRECT) {
366 /*
367 * ICMPv6 error
368 * Special case: for redirect (which is
369 * informational) we must not send icmp6 error.
370 */
371 icmp6stat.icp6s_canterror++;
372 goto freeit;
373 } else {
374 /* ICMPv6 informational - send the error */
375 }
376 } else {
377 /* non-ICMPv6 - send the error */
378 }
379
380 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
381
382 /* Finally, do rate limitation check. */
383 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
384 icmp6stat.icp6s_toofreq++;
385 goto freeit;
386 }
387
388 /*
389 * OK, ICMP6 can be generated.
390 */
391
392 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
393 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
394
395 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
396 M_PREPEND(m, preplen, M_DONTWAIT);
397 if (m && m->m_len < preplen)
398 m = m_pullup(m, preplen);
399 if (m == NULL) {
400 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
401 return;
402 }
403
404 nip6 = mtod(m, struct ip6_hdr *);
405 nip6->ip6_src = oip6->ip6_src;
406 nip6->ip6_dst = oip6->ip6_dst;
407
408 in6_clearscope(&oip6->ip6_src);
409 in6_clearscope(&oip6->ip6_dst);
410
411 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
412 icmp6->icmp6_type = type;
413 icmp6->icmp6_code = code;
414 icmp6->icmp6_pptr = htonl((u_int32_t)param);
415
416 /*
417 * icmp6_reflect() is designed to be in the input path.
418 * icmp6_error() can be called from both input and output path,
419 * and if we are in output path rcvif could contain bogus value.
420 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
421 * information in ip header (nip6).
422 */
423 m->m_pkthdr.rcvif = NULL;
424
425 icmp6stat.icp6s_outhist[type]++;
426 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
427
428 return;
429
430 freeit:
431 /*
432 * If we can't tell whether or not we can generate ICMP6, free it.
433 */
434 m_freem(m);
435 }
436
437 /*
438 * Process a received ICMP6 message.
439 */
440 int
441 icmp6_input(struct mbuf **mp, int *offp, int proto)
442 {
443 #pragma unused(proto)
444 struct mbuf *m = *mp, *n;
445 struct ifnet *ifp;
446 struct ip6_hdr *ip6, *nip6;
447 struct icmp6_hdr *icmp6, *nicmp6;
448 int off = *offp;
449 int icmp6len = m->m_pkthdr.len - *offp;
450 int code, sum, noff, proxy = 0;
451
452 ifp = m->m_pkthdr.rcvif;
453
454 #ifndef PULLDOWN_TEST
455 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), return IPPROTO_DONE);
456 /* m might change if M_LOOP. So, call mtod after this */
457 #endif
458
459 /* Expect 32-bit aligned data pointer on strict-align platforms */
460 MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
461
462 /*
463 * Locate icmp6 structure in mbuf, and check
464 * that not corrupted and of at least minimum length
465 */
466 ip6 = mtod(m, struct ip6_hdr *);
467 if (icmp6len < sizeof(struct icmp6_hdr)) {
468 icmp6stat.icp6s_tooshort++;
469 goto freeit;
470 }
471
472 #ifndef PULLDOWN_TEST
473 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
474 #else
475 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
476 if (icmp6 == NULL) {
477 icmp6stat.icp6s_tooshort++;
478 return IPPROTO_DONE;
479 }
480 #endif
481 code = icmp6->icmp6_code;
482
483 /* Apply rate limit before checksum validation. */
484 if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) {
485 icmp6stat.icp6s_toofreq++;
486 goto freeit;
487 }
488
489 /*
490 * Check multicast group membership.
491 * Note: SSM filters are not applied for ICMPv6 traffic.
492 */
493 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
494 struct in6_multi *inm;
495
496 in6_multihead_lock_shared();
497 IN6_LOOKUP_MULTI(&ip6->ip6_dst, ifp, inm);
498 in6_multihead_lock_done();
499
500 if (inm == NULL) {
501 /*
502 * Don't discard if this is a Neighbor Solicitation
503 * that needs to be proxied (see check down below.)
504 */
505 if (!(m->m_pkthdr.pkt_flags & PKTF_PROXY_DST)) {
506 ip6stat.ip6s_notmember++;
507 in6_ifstat_inc(m->m_pkthdr.rcvif,
508 ifs6_in_discard);
509 goto freeit;
510 }
511 } else {
512 IN6M_REMREF(inm);
513 }
514 }
515
516 /*
517 * calculate the checksum
518 */
519 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
520 nd6log((LOG_ERR,
521 "ICMP6 checksum error(%d|%x) %s\n",
522 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
523 icmp6stat.icp6s_checksum++;
524 goto freeit;
525 }
526
527 if (m->m_pkthdr.pkt_flags & PKTF_PROXY_DST) {
528 /*
529 * This is the special case of proxying NS (dst is either
530 * solicited-node multicast or unicast); process it locally
531 * but don't deliver it to sockets. It practically lets us
532 * steer the packet to nd6_prproxy_ns_input, where more
533 * specific tests and actions will be taken.
534 */
535 switch (icmp6->icmp6_type) {
536 case ND_NEIGHBOR_SOLICIT:
537 proxy = 1;
538 break;
539 default:
540 goto freeit;
541 }
542 }
543
544 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
545 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
546 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
547 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
548
549 switch (icmp6->icmp6_type) {
550 case ICMP6_DST_UNREACH:
551 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
552 switch (code) {
553 case ICMP6_DST_UNREACH_NOROUTE:
554 code = PRC_UNREACH_NET;
555 break;
556 case ICMP6_DST_UNREACH_ADMIN:
557 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
558 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
559 break;
560 case ICMP6_DST_UNREACH_ADDR:
561 code = PRC_HOSTDEAD;
562 break;
563 case ICMP6_DST_UNREACH_BEYONDSCOPE:
564 /* I mean "source address was incorrect." */
565 code = PRC_PARAMPROB;
566 break;
567 case ICMP6_DST_UNREACH_NOPORT:
568 code = PRC_UNREACH_PORT;
569 break;
570 default:
571 goto badcode;
572 }
573 goto deliver;
574 break;
575
576 case ICMP6_PACKET_TOO_BIG:
577 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
578
579 code = PRC_MSGSIZE;
580
581 /*
582 * Updating the path MTU will be done after examining
583 * intermediate extension headers.
584 */
585 goto deliver;
586 break;
587
588 case ICMP6_TIME_EXCEEDED:
589 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
590 switch (code) {
591 case ICMP6_TIME_EXCEED_TRANSIT:
592 code = PRC_TIMXCEED_INTRANS;
593 break;
594 case ICMP6_TIME_EXCEED_REASSEMBLY:
595 code = PRC_TIMXCEED_REASS;
596 break;
597 default:
598 goto badcode;
599 }
600 goto deliver;
601 break;
602
603 case ICMP6_PARAM_PROB:
604 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
605 switch (code) {
606 case ICMP6_PARAMPROB_NEXTHEADER:
607 code = PRC_UNREACH_PROTOCOL;
608 break;
609 case ICMP6_PARAMPROB_HEADER:
610 case ICMP6_PARAMPROB_OPTION:
611 code = PRC_PARAMPROB;
612 break;
613 default:
614 goto badcode;
615 }
616 goto deliver;
617 break;
618
619 case ICMP6_ECHO_REQUEST:
620 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
621 if (code != 0)
622 goto badcode;
623
624 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
625 /* Give up remote */
626 goto rate_limit_checked;
627 break;
628 }
629 if ((n->m_flags & M_EXT) != 0
630 || n->m_len < off + sizeof(struct icmp6_hdr)) {
631 struct mbuf *n0 = n;
632 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
633
634 /*
635 * Prepare an internal mbuf. m_pullup() doesn't
636 * always copy the length we specified.
637 */
638 if (maxlen >= MCLBYTES) {
639 /* Give up remote */
640 m_freem(n0);
641 goto rate_limit_checked;
642 break;
643 }
644 MGETHDR(n, M_DONTWAIT, n0->m_type); /* MAC-OK */
645 if (n && maxlen >= MHLEN) {
646 MCLGET(n, M_DONTWAIT);
647 if ((n->m_flags & M_EXT) == 0) {
648 m_free(n);
649 n = NULL;
650 }
651 }
652 if (n == NULL) {
653 /* Give up remote */
654 m_freem(n0);
655 goto rate_limit_checked;
656 break;
657 }
658 M_COPY_PKTHDR(n, n0);
659 /*
660 * Copy IPv6 and ICMPv6 only.
661 */
662 nip6 = mtod(n, struct ip6_hdr *);
663 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
664 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
665 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
666 noff = sizeof(struct ip6_hdr);
667 n->m_pkthdr.len = n->m_len =
668 noff + sizeof(struct icmp6_hdr);
669 /*
670 * Adjust mbuf. ip6_plen will be adjusted in
671 * ip6_output().
672 */
673 m_adj(n0, off + sizeof(struct icmp6_hdr));
674 n->m_pkthdr.len += n0->m_pkthdr.len;
675 n->m_next = n0;
676 n0->m_flags &= ~M_PKTHDR;
677 } else {
678 nip6 = mtod(n, struct ip6_hdr *);
679 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
680 sizeof(*nicmp6));
681 noff = off;
682 }
683 if(nicmp6 == NULL)
684 panic("nicmp6 is NULL in %s, which isn't good!\n", __FUNCTION__);
685 else {
686 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
687 nicmp6->icmp6_code = 0;
688 }
689 if (n) {
690 icmp6stat.icp6s_reflect++;
691 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
692 icmp6_reflect(n, noff);
693 }
694 goto rate_limit_checked;
695 break;
696
697 case ICMP6_ECHO_REPLY:
698 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
699 if (code != 0)
700 goto badcode;
701 break;
702
703 case MLD_LISTENER_QUERY:
704 case MLD_LISTENER_REPORT:
705
706 if (icmp6len < sizeof(struct mld_hdr))
707 goto badlen;
708 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
709 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
710 else
711 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
712
713 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
714 /* give up local */
715 if (mld_input(m, off, icmp6len) == IPPROTO_DONE)
716 m = NULL;
717 goto freeit;
718 }
719 if (mld_input(n, off, icmp6len) != IPPROTO_DONE)
720 m_freem(n);
721 /* m stays. */
722 goto rate_limit_checked;
723 break;
724
725 case MLD_LISTENER_DONE:
726 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
727 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
728 goto badlen;
729 break; /* nothing to be done in kernel */
730
731 case MLD_MTRACE_RESP:
732 case MLD_MTRACE:
733 /* XXX: these two are experimental. not officially defined. */
734 /* XXX: per-interface statistics? */
735 break; /* just pass it to applications */
736
737 case ICMP6_NI_QUERY:
738 if (!icmp6_nodeinfo)
739 break;
740 //### LD 10/20 Check fbsd differences here. Not sure we're more advanced or not.
741 /* By RFC 4620 refuse to answer queries from global scope addresses */
742 if ((icmp6_nodeinfo & 8) != 8 && in6_addrscope(&ip6->ip6_src) == IPV6_ADDR_SCOPE_GLOBAL)
743 break;
744
745 if (icmp6len < sizeof(struct icmp6_nodeinfo))
746 goto badlen;
747
748 #ifndef PULLDOWN_TEST
749 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
750 return IPPROTO_DONE);
751 #endif
752
753 n = m_copy(m, 0, M_COPYALL);
754 if (n)
755 n = ni6_input(n, off);
756 if (n) {
757 noff = sizeof(struct ip6_hdr);
758 icmp6stat.icp6s_reflect++;
759 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
760 icmp6_reflect(n, noff);
761 }
762 goto rate_limit_checked;
763 break;
764
765 case ICMP6_WRUREPLY:
766 if (code != 0)
767 goto badcode;
768 break;
769
770 case ND_ROUTER_SOLICIT:
771 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
772 if (code != 0)
773 goto badcode;
774 if (icmp6len < sizeof(struct nd_router_solicit))
775 goto badlen;
776
777 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
778 /* give up local */
779 nd6_rs_input(m, off, icmp6len);
780 m = NULL;
781 goto freeit;
782 }
783 nd6_rs_input(n, off, icmp6len);
784 /* m stays. */
785 goto rate_limit_checked;
786 break;
787
788 case ND_ROUTER_ADVERT:
789 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
790 if (code != 0)
791 goto badcode;
792 if (icmp6len < sizeof(struct nd_router_advert))
793 goto badlen;
794
795 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
796 /* give up local */
797 nd6_ra_input(m, off, icmp6len);
798 m = NULL;
799 goto freeit;
800 }
801 nd6_ra_input(n, off, icmp6len);
802 /* m stays. */
803 goto rate_limit_checked;
804 break;
805
806 case ND_NEIGHBOR_SOLICIT:
807 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
808 if (code != 0)
809 goto badcode;
810 if (icmp6len < sizeof(struct nd_neighbor_solicit))
811 goto badlen;
812
813 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
814 /* give up local */
815 nd6_ns_input(m, off, icmp6len);
816 m = NULL;
817 goto freeit;
818 }
819 nd6_ns_input(n, off, icmp6len);
820 /* m stays. */
821 goto rate_limit_checked;
822 break;
823
824 case ND_NEIGHBOR_ADVERT:
825 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
826 if (code != 0)
827 goto badcode;
828 if (icmp6len < sizeof(struct nd_neighbor_advert))
829 goto badlen;
830
831 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
832 /* give up local */
833 nd6_na_input(m, off, icmp6len);
834 m = NULL;
835 goto freeit;
836 }
837 nd6_na_input(n, off, icmp6len);
838 /* m stays. */
839 goto rate_limit_checked;
840 break;
841
842 case ND_REDIRECT:
843 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
844 if (code != 0)
845 goto badcode;
846 if (icmp6len < sizeof(struct nd_redirect))
847 goto badlen;
848
849 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
850 /* give up local */
851 icmp6_redirect_input(m, off);
852 m = NULL;
853 goto freeit;
854 }
855 icmp6_redirect_input(n, off);
856 /* m stays. */
857 goto rate_limit_checked;
858 break;
859
860 case ICMP6_ROUTER_RENUMBERING:
861 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
862 code != ICMP6_ROUTER_RENUMBERING_RESULT)
863 goto badcode;
864 if (icmp6len < sizeof(struct icmp6_router_renum))
865 goto badlen;
866 break;
867
868 default:
869 nd6log((LOG_DEBUG,
870 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
871 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
872 ip6_sprintf(&ip6->ip6_dst),
873 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
874 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
875 /* ICMPv6 error: MUST deliver it by spec... */
876 code = PRC_NCMDS;
877 /* deliver */
878 } else {
879 /* ICMPv6 informational: MUST not deliver */
880 goto rate_limit_checked;
881 break;
882 }
883 deliver:
884 if (icmp6_notify_error(m, off, icmp6len, code)) {
885 /* In this case, m should've been freed. */
886 return(IPPROTO_DONE);
887 }
888 break;
889
890 badcode:
891 icmp6stat.icp6s_badcode++;
892 break;
893
894 badlen:
895 icmp6stat.icp6s_badlen++;
896 break;
897 }
898
899 rate_limit_checked:
900 /* deliver the packet to appropriate sockets (unless proxying) */
901 if (!proxy) {
902 icmp6_rip6_input(&m, *offp);
903 return IPPROTO_DONE;
904 }
905
906 freeit:
907 m_freem(m);
908 return IPPROTO_DONE;
909 }
910
911 static int
912 icmp6_notify_error(m, off, icmp6len, code)
913 struct mbuf *m;
914 int off, icmp6len, code;
915 {
916 struct icmp6_hdr *icmp6;
917 struct ip6_hdr *eip6;
918 u_int32_t notifymtu;
919 struct sockaddr_in6 icmp6src, icmp6dst;
920
921 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
922 icmp6stat.icp6s_tooshort++;
923 goto freeit;
924 }
925 #ifndef PULLDOWN_TEST
926 IP6_EXTHDR_CHECK(m, off,
927 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
928 return -1);
929 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
930 #else
931 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
932 sizeof(*icmp6) + sizeof(struct ip6_hdr));
933 if (icmp6 == NULL) {
934 icmp6stat.icp6s_tooshort++;
935 return(-1);
936 }
937 #endif
938 eip6 = (struct ip6_hdr *)(icmp6 + 1);
939
940 /* Detect the upper level protocol */
941 {
942 void (*ctlfunc)(int, struct sockaddr *, void *);
943 u_int8_t nxt = eip6->ip6_nxt;
944 int eoff = off + sizeof(struct icmp6_hdr) +
945 sizeof(struct ip6_hdr);
946 struct ip6ctlparam ip6cp;
947 struct in6_addr *finaldst = NULL;
948 int icmp6type = icmp6->icmp6_type;
949 struct ip6_frag *fh;
950 struct ip6_rthdr *rth;
951 struct ip6_rthdr0 *rth0;
952 int rthlen;
953
954 while (1) { /* XXX: should avoid infinite loop explicitly? */
955 struct ip6_ext *eh;
956
957 switch (nxt) {
958 case IPPROTO_HOPOPTS:
959 case IPPROTO_DSTOPTS:
960 case IPPROTO_AH:
961 #ifndef PULLDOWN_TEST
962 IP6_EXTHDR_CHECK(m, 0, eoff +
963 sizeof(struct ip6_ext),
964 return -1);
965 eh = (struct ip6_ext *)(mtod(m, caddr_t)
966 + eoff);
967 #else
968 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
969 eoff, sizeof(*eh));
970 if (eh == NULL) {
971 icmp6stat.icp6s_tooshort++;
972 return(-1);
973 }
974 #endif
975
976 if (nxt == IPPROTO_AH)
977 eoff += (eh->ip6e_len + 2) << 2;
978 else
979 eoff += (eh->ip6e_len + 1) << 3;
980 nxt = eh->ip6e_nxt;
981 break;
982 case IPPROTO_ROUTING:
983 /*
984 * When the erroneous packet contains a
985 * routing header, we should examine the
986 * header to determine the final destination.
987 * Otherwise, we can't properly update
988 * information that depends on the final
989 * destination (e.g. path MTU).
990 */
991 #ifndef PULLDOWN_TEST
992 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
993 return -1);
994 rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
995 + eoff);
996 #else
997 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
998 eoff, sizeof(*rth));
999 if (rth == NULL) {
1000 icmp6stat.icp6s_tooshort++;
1001 return(-1);
1002 }
1003 #endif
1004 rthlen = (rth->ip6r_len + 1) << 3;
1005 /*
1006 * XXX: currently there is no
1007 * officially defined type other
1008 * than type-0.
1009 * Note that if the segment left field
1010 * is 0, all intermediate hops must
1011 * have been passed.
1012 */
1013 if (rth->ip6r_segleft &&
1014 rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
1015 int hops;
1016
1017 #ifndef PULLDOWN_TEST
1018 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen,
1019 return -1);
1020 rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff);
1021 #else
1022 IP6_EXTHDR_GET(rth0,
1023 struct ip6_rthdr0 *, m,
1024 eoff, rthlen);
1025 if (rth0 == NULL) {
1026 icmp6stat.icp6s_tooshort++;
1027 return(-1);
1028 }
1029 #endif
1030 /* just ignore a bogus header */
1031 if ((rth0->ip6r0_len % 2) == 0 &&
1032 (hops = rth0->ip6r0_len/2))
1033 finaldst = (struct in6_addr *)(void *)(rth0 + 1) + (hops - 1);
1034 }
1035 eoff += rthlen;
1036 nxt = rth->ip6r_nxt;
1037 break;
1038 case IPPROTO_FRAGMENT:
1039 #ifndef PULLDOWN_TEST
1040 IP6_EXTHDR_CHECK(m, 0, eoff +
1041 sizeof(struct ip6_frag),
1042 return -1);
1043 fh = (struct ip6_frag *)(mtod(m, caddr_t)
1044 + eoff);
1045 #else
1046 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
1047 eoff, sizeof(*fh));
1048 if (fh == NULL) {
1049 icmp6stat.icp6s_tooshort++;
1050 return (-1);
1051 }
1052 #endif
1053 /*
1054 * Data after a fragment header is meaningless
1055 * unless it is the first fragment, but
1056 * we'll go to the notify label for path MTU
1057 * discovery.
1058 */
1059 if (fh->ip6f_offlg & IP6F_OFF_MASK)
1060 goto notify;
1061
1062 eoff += sizeof(struct ip6_frag);
1063 nxt = fh->ip6f_nxt;
1064 break;
1065 default:
1066 /*
1067 * This case includes ESP and the No Next
1068 * Header. In such cases going to the notify
1069 * label does not have any meaning
1070 * (i.e. ctlfunc will be NULL), but we go
1071 * anyway since we might have to update
1072 * path MTU information.
1073 */
1074 goto notify;
1075 }
1076 }
1077 notify:
1078 #ifndef PULLDOWN_TEST
1079 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1080 #else
1081 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1082 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1083 if (icmp6 == NULL) {
1084 icmp6stat.icp6s_tooshort++;
1085 return (-1);
1086 }
1087 #endif
1088
1089 /*
1090 * retrieve parameters from the inner IPv6 header, and convert
1091 * them into sockaddr structures.
1092 * XXX: there is no guarantee that the source or destination
1093 * addresses of the inner packet are in the same scope as
1094 * the addresses of the icmp packet. But there is no other
1095 * way to determine the zone.
1096 */
1097 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1098
1099 bzero(&icmp6dst, sizeof(icmp6dst));
1100 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1101 icmp6dst.sin6_family = AF_INET6;
1102 if (finaldst == NULL)
1103 icmp6dst.sin6_addr = eip6->ip6_dst;
1104 else
1105 icmp6dst.sin6_addr = *finaldst;
1106 if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
1107 goto freeit;
1108 bzero(&icmp6src, sizeof(icmp6src));
1109 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1110 icmp6src.sin6_family = AF_INET6;
1111 icmp6src.sin6_addr = eip6->ip6_src;
1112 if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
1113 goto freeit;
1114 icmp6src.sin6_flowinfo =
1115 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1116
1117 if (finaldst == NULL)
1118 finaldst = &eip6->ip6_dst;
1119 ip6cp.ip6c_m = m;
1120 ip6cp.ip6c_icmp6 = icmp6;
1121 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1122 ip6cp.ip6c_off = eoff;
1123 ip6cp.ip6c_finaldst = finaldst;
1124 ip6cp.ip6c_src = &icmp6src;
1125 ip6cp.ip6c_nxt = nxt;
1126
1127 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1128 notifymtu = ntohl(icmp6->icmp6_mtu);
1129 ip6cp.ip6c_cmdarg = (void *)&notifymtu;
1130 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1131 }
1132
1133 ctlfunc = (void (*)(int, struct sockaddr *, void *))
1134 (ip6_protox[nxt]->pr_ctlinput);
1135 if (ctlfunc) {
1136 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
1137 &ip6cp);
1138 }
1139 }
1140 return(0);
1141
1142 freeit:
1143 m_freem(m);
1144 return(-1);
1145 }
1146
1147 void
1148 icmp6_mtudisc_update(ip6cp, validated)
1149 struct ip6ctlparam *ip6cp;
1150 int validated;
1151 {
1152 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1153 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1154 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1155 u_int mtu = ntohl(icmp6->icmp6_mtu);
1156 struct rtentry *rt = NULL;
1157 struct sockaddr_in6 sin6;
1158 /*
1159 * we reject ICMPv6 too big with abnormally small value.
1160 * XXX what is the good definition of "abnormally small"?
1161 */
1162 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
1163 return;
1164
1165 if (!validated)
1166 return;
1167
1168 /*
1169 * In case the suggested mtu is less than IPV6_MMTU, we
1170 * only need to remember that it was for above mentioned
1171 * "alwaysfrag" case.
1172 * Try to be as close to the spec as possible.
1173 */
1174 if (mtu < IPV6_MMTU)
1175 mtu = IPV6_MMTU - 8;
1176
1177 bzero(&sin6, sizeof(sin6));
1178 sin6.sin6_family = PF_INET6;
1179 sin6.sin6_len = sizeof(struct sockaddr_in6);
1180 sin6.sin6_addr = *dst;
1181 /* XXX normally, this won't happen */
1182 if (IN6_IS_ADDR_LINKLOCAL(dst)) {
1183 sin6.sin6_addr.s6_addr16[1] =
1184 htons(m->m_pkthdr.rcvif->if_index);
1185 }
1186 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
1187 rt = rtalloc1_scoped((struct sockaddr *)&sin6, 0,
1188 RTF_CLONING | RTF_PRCLONING, m->m_pkthdr.rcvif->if_index);
1189 if (rt != NULL) {
1190 RT_LOCK(rt);
1191 if ((rt->rt_flags & RTF_HOST) &&
1192 !(rt->rt_rmx.rmx_locks & RTV_MTU) &&
1193 mtu < IN6_LINKMTU(rt->rt_ifp) &&
1194 rt->rt_rmx.rmx_mtu > mtu) {
1195 icmp6stat.icp6s_pmtuchg++;
1196 rt->rt_rmx.rmx_mtu = mtu;
1197 }
1198 RT_UNLOCK(rt);
1199 rtfree(rt);
1200 }
1201 }
1202
1203 /*
1204 * Process a Node Information Query packet, based on
1205 * draft-ietf-ipngwg-icmp-name-lookups-07.
1206 *
1207 * Spec incompatibilities:
1208 * - IPv6 Subject address handling
1209 * - IPv4 Subject address handling support missing
1210 * - Proxy reply (answer even if it's not for me)
1211 * - joins NI group address at in6_ifattach() time only, does not cope
1212 * with hostname changes by sethostname(3)
1213 */
1214 #define hostnamelen strlen(hostname)
1215 static struct mbuf *
1216 ni6_input(m, off)
1217 struct mbuf *m;
1218 int off;
1219 {
1220 struct icmp6_nodeinfo *ni6, *nni6;
1221 struct mbuf *n = NULL;
1222 u_int16_t qtype;
1223 int subjlen;
1224 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1225 struct ni_reply_fqdn *fqdn;
1226 int addrs; /* for NI_QTYPE_NODEADDR */
1227 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1228 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
1229 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
1230 struct ip6_hdr *ip6;
1231 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1232 char *subj = NULL;
1233
1234 ip6 = mtod(m, struct ip6_hdr *);
1235 #ifndef PULLDOWN_TEST
1236 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1237 #else
1238 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1239 if (ni6 == NULL) {
1240 /* m is already reclaimed */
1241 return (NULL);
1242 }
1243 #endif
1244
1245 /*
1246 * Validate IPv6 source address.
1247 * The default configuration MUST be to refuse answering queries from
1248 * global-scope addresses according to RFC4602.
1249 * Notes:
1250 * - it's not very clear what "refuse" means; this implementation
1251 * simply drops it.
1252 * - it's not very easy to identify global-scope (unicast) addresses
1253 * since there are many prefixes for them. It should be safer
1254 * and in practice sufficient to check "all" but loopback and
1255 * link-local (note that site-local unicast was deprecated and
1256 * ULA is defined as global scope-wise)
1257 */
1258 if ((icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 &&
1259 !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) &&
1260 !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
1261 goto bad;
1262
1263 /*
1264 * Validate IPv6 destination address.
1265 *
1266 * The Responder must discard the Query without further processing
1267 * unless it is one of the Responder's unicast or anycast addresses, or
1268 * a link-local scope multicast address which the Responder has joined.
1269 * [RFC4602, Section 5.]
1270 */
1271 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
1272 if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1273 goto bad;
1274 /* else it's a link-local multicast, fine */
1275 } else { /* unicast or anycast */
1276 uint32_t ia6_flags;
1277
1278 if (ip6_getdstifaddr_info(m, NULL, &ia6_flags) != 0)
1279 goto bad; /* XXX impossible */
1280
1281 if ((ia6_flags & IN6_IFF_TEMPORARY) &&
1282 !(icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) {
1283 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1284 "a temporary address in %s:%d",
1285 __FILE__, __LINE__));
1286 goto bad;
1287 }
1288 }
1289
1290 /* validate query Subject field. */
1291 qtype = ntohs(ni6->ni_qtype);
1292 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1293 switch (qtype) {
1294 case NI_QTYPE_NOOP:
1295 case NI_QTYPE_SUPTYPES:
1296 /* 07 draft */
1297 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1298 break;
1299 /* FALLTHROUGH */
1300 case NI_QTYPE_FQDN:
1301 case NI_QTYPE_NODEADDR:
1302 case NI_QTYPE_IPV4ADDR:
1303 switch (ni6->ni_code) {
1304 case ICMP6_NI_SUBJ_IPV6:
1305 #if ICMP6_NI_SUBJ_IPV6 != 0
1306 case 0:
1307 #endif
1308 /*
1309 * backward compatibility - try to accept 03 draft
1310 * format, where no Subject is present.
1311 */
1312 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1313 subjlen == 0) {
1314 oldfqdn++;
1315 break;
1316 }
1317 #if ICMP6_NI_SUBJ_IPV6 != 0
1318 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1319 goto bad;
1320 #endif
1321
1322 if (subjlen != sizeof(struct in6_addr))
1323 goto bad;
1324
1325 /*
1326 * Validate Subject address.
1327 *
1328 * Not sure what exactly "address belongs to the node"
1329 * means in the spec, is it just unicast, or what?
1330 *
1331 * At this moment we consider Subject address as
1332 * "belong to the node" if the Subject address equals
1333 * to the IPv6 destination address; validation for
1334 * IPv6 destination address should have done enough
1335 * check for us.
1336 *
1337 * We do not do proxy at this moment.
1338 */
1339 /* m_pulldown instead of copy? */
1340 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1341 subjlen, (caddr_t)&sin6.sin6_addr);
1342 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1343 &sin6.sin6_addr);
1344 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL,
1345 NULL);
1346 bzero(&sin6_d, sizeof(sin6_d));
1347 sin6_d.sin6_family = AF_INET6; /* not used, actually */
1348 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */
1349 sin6_d.sin6_addr = ip6->ip6_dst;
1350 sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1351 &ip6->ip6_dst);
1352 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL,
1353 NULL);
1354 subj = (char *)&sin6;
1355 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
1356 break;
1357
1358 /*
1359 * XXX if we are to allow other cases, we should really
1360 * be careful about scope here.
1361 * basically, we should disallow queries toward IPv6
1362 * destination X with subject Y,
1363 * if scope(X) > scope(Y).
1364 * if we allow scope(X) > scope(Y), it will result in
1365 * information leakage across scope boundary.
1366 */
1367 goto bad;
1368
1369 case ICMP6_NI_SUBJ_FQDN:
1370 /*
1371 * Validate Subject name with gethostname(3).
1372 *
1373 * The behavior may need some debate, since:
1374 * - we are not sure if the node has FQDN as
1375 * hostname (returned by gethostname(3)).
1376 * - the code does wildcard match for truncated names.
1377 * however, we are not sure if we want to perform
1378 * wildcard match, if gethostname(3) side has
1379 * truncated hostname.
1380 */
1381 n = ni6_nametodns(hostname, hostnamelen, 0);
1382 if (!n || n->m_next || n->m_len == 0)
1383 goto bad;
1384 IP6_EXTHDR_GET(subj, char *, m,
1385 off + sizeof(struct icmp6_nodeinfo), subjlen);
1386 if (subj == NULL)
1387 goto bad;
1388 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1389 n->m_len)) {
1390 goto bad;
1391 }
1392 m_freem(n);
1393 n = NULL;
1394 break;
1395
1396 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1397 default:
1398 goto bad;
1399 }
1400 break;
1401 }
1402
1403 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1404 switch (qtype) {
1405 case NI_QTYPE_FQDN:
1406 if ((icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0)
1407 goto bad;
1408 break;
1409 case NI_QTYPE_NODEADDR:
1410 case NI_QTYPE_IPV4ADDR:
1411 if ((icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0)
1412 goto bad;
1413 break;
1414 }
1415
1416 /* guess reply length */
1417 switch (qtype) {
1418 case NI_QTYPE_NOOP:
1419 break; /* no reply data */
1420 case NI_QTYPE_SUPTYPES:
1421 replylen += sizeof(u_int32_t);
1422 break;
1423 case NI_QTYPE_FQDN:
1424 /* XXX will append an mbuf */
1425 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1426 break;
1427 case NI_QTYPE_NODEADDR:
1428 addrs = ni6_addrs(ni6, &ifp, subj);
1429 if ((replylen += addrs * (sizeof(struct in6_addr) +
1430 sizeof(u_int32_t))) > MCLBYTES)
1431 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1432 break;
1433 case NI_QTYPE_IPV4ADDR:
1434 /* unsupported - should respond with unknown Qtype? */
1435 break;
1436 default:
1437 /*
1438 * XXX: We must return a reply with the ICMP6 code
1439 * `unknown Qtype' in this case. However we regard the case
1440 * as an FQDN query for backward compatibility.
1441 * Older versions set a random value to this field,
1442 * so it rarely varies in the defined qtypes.
1443 * But the mechanism is not reliable...
1444 * maybe we should obsolete older versions.
1445 */
1446 qtype = NI_QTYPE_FQDN;
1447 /* XXX will append an mbuf */
1448 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1449 oldfqdn++;
1450 break;
1451 }
1452
1453 /* allocate an mbuf to reply. */
1454 MGETHDR(n, M_DONTWAIT, m->m_type); /* MAC-OK */
1455 if (n == NULL) {
1456 m_freem(m);
1457 if (ifp != NULL)
1458 ifnet_release(ifp);
1459 return (NULL);
1460 }
1461 M_COPY_PKTHDR(n, m); /* just for recvif */
1462 if (replylen > MHLEN) {
1463 if (replylen > MCLBYTES) {
1464 /*
1465 * XXX: should we try to allocate more? But MCLBYTES
1466 * is probably much larger than IPV6_MMTU...
1467 */
1468 goto bad;
1469 }
1470 MCLGET(n, M_DONTWAIT);
1471 if ((n->m_flags & M_EXT) == 0) {
1472 goto bad;
1473 }
1474 }
1475 n->m_pkthdr.len = n->m_len = replylen;
1476
1477 /* copy mbuf header and IPv6 + Node Information base headers */
1478 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1479 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1480 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1481
1482 /* qtype dependent procedure */
1483 switch (qtype) {
1484 case NI_QTYPE_NOOP:
1485 nni6->ni_code = ICMP6_NI_SUCCESS;
1486 nni6->ni_flags = 0;
1487 break;
1488 case NI_QTYPE_SUPTYPES:
1489 {
1490 u_int32_t v;
1491 nni6->ni_code = ICMP6_NI_SUCCESS;
1492 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1493 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1494 v = (u_int32_t)htonl(0x0000000f);
1495 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1496 break;
1497 }
1498 case NI_QTYPE_FQDN:
1499 nni6->ni_code = ICMP6_NI_SUCCESS;
1500 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1501 sizeof(struct ip6_hdr) +
1502 sizeof(struct icmp6_nodeinfo));
1503 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1504 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1505 /*
1506 * XXX do we really have FQDN in variable "hostname"?
1507 */
1508 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1509 if (n->m_next == NULL)
1510 goto bad;
1511 /* XXX we assume that n->m_next is not a chain */
1512 if (n->m_next->m_next != NULL)
1513 goto bad;
1514 n->m_pkthdr.len += n->m_next->m_len;
1515 break;
1516 case NI_QTYPE_NODEADDR:
1517 {
1518 int lenlim, copied;
1519
1520 nni6->ni_code = ICMP6_NI_SUCCESS;
1521 n->m_pkthdr.len = n->m_len =
1522 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1523 lenlim = M_TRAILINGSPACE(n);
1524 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1525 /* XXX: reset mbuf length */
1526 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1527 sizeof(struct icmp6_nodeinfo) + copied;
1528 break;
1529 }
1530 default:
1531 break; /* XXX impossible! */
1532 }
1533
1534 nni6->ni_type = ICMP6_NI_REPLY;
1535 m_freem(m);
1536 if (ifp != NULL)
1537 ifnet_release(ifp);
1538 return (n);
1539
1540 bad:
1541 m_freem(m);
1542 if (n)
1543 m_freem(n);
1544 if (ifp != NULL)
1545 ifnet_release(ifp);
1546 return (NULL);
1547 }
1548 #undef hostnamelen
1549
1550 /*
1551 * make a mbuf with DNS-encoded string. no compression support.
1552 *
1553 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1554 * treated as truncated name (two \0 at the end). this is a wild guess.
1555 */
1556 static struct mbuf *
1557 ni6_nametodns(name, namelen, old)
1558 const char *name;
1559 int namelen;
1560 int old; /* return pascal string if non-zero */
1561 {
1562 struct mbuf *m;
1563 char *cp, *ep;
1564 const char *p, *q;
1565 int i, len, nterm;
1566
1567 if (old)
1568 len = namelen + 1;
1569 else
1570 len = MCLBYTES;
1571
1572 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1573 MGET(m, M_DONTWAIT, MT_DATA);
1574 if (m && len > MLEN) {
1575 MCLGET(m, M_DONTWAIT);
1576 if ((m->m_flags & M_EXT) == 0)
1577 goto fail;
1578 }
1579 if (!m)
1580 goto fail;
1581 m->m_next = NULL;
1582
1583 if (old) {
1584 m->m_len = len;
1585 *mtod(m, char *) = namelen;
1586 bcopy(name, mtod(m, char *) + 1, namelen);
1587 return m;
1588 } else {
1589 m->m_len = 0;
1590 cp = mtod(m, char *);
1591 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1592
1593 /* if not certain about my name, return empty buffer */
1594 if (namelen == 0)
1595 return m;
1596
1597 /*
1598 * guess if it looks like shortened hostname, or FQDN.
1599 * shortened hostname needs two trailing "\0".
1600 */
1601 i = 0;
1602 for (p = name; p < name + namelen; p++) {
1603 if (*p && *p == '.')
1604 i++;
1605 }
1606 if (i < 2)
1607 nterm = 2;
1608 else
1609 nterm = 1;
1610
1611 p = name;
1612 while (cp < ep && p < name + namelen) {
1613 i = 0;
1614 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1615 i++;
1616 /* result does not fit into mbuf */
1617 if (cp + i + 1 >= ep)
1618 goto fail;
1619 /*
1620 * DNS label length restriction, RFC1035 page 8.
1621 * "i == 0" case is included here to avoid returning
1622 * 0-length label on "foo..bar".
1623 */
1624 if (i <= 0 || i >= 64)
1625 goto fail;
1626 *cp++ = i;
1627 bcopy(p, cp, i);
1628 cp += i;
1629 p = q;
1630 if (p < name + namelen && *p == '.')
1631 p++;
1632 }
1633 /* termination */
1634 if (cp + nterm >= ep)
1635 goto fail;
1636 while (nterm-- > 0)
1637 *cp++ = '\0';
1638 m->m_len = cp - mtod(m, char *);
1639 return m;
1640 }
1641
1642 panic("should not reach here");
1643 /* NOTREACHED */
1644
1645 fail:
1646 if (m)
1647 m_freem(m);
1648 return NULL;
1649 }
1650
1651 /*
1652 * check if two DNS-encoded string matches. takes care of truncated
1653 * form (with \0\0 at the end). no compression support.
1654 * XXX upper/lowercase match (see RFC2065)
1655 */
1656 static int
1657 ni6_dnsmatch(a, alen, b, blen)
1658 const char *a;
1659 int alen;
1660 const char *b;
1661 int blen;
1662 {
1663 const char *a0, *b0;
1664 int l;
1665
1666 /* simplest case - need validation? */
1667 if (alen == blen && bcmp(a, b, alen) == 0)
1668 return 1;
1669
1670 a0 = a;
1671 b0 = b;
1672
1673 /* termination is mandatory */
1674 if (alen < 2 || blen < 2)
1675 return 0;
1676 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1677 return 0;
1678 alen--;
1679 blen--;
1680
1681 while (a - a0 < alen && b - b0 < blen) {
1682 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1683 return 0;
1684
1685 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1686 return 0;
1687 /* we don't support compression yet */
1688 if (a[0] >= 64 || b[0] >= 64)
1689 return 0;
1690
1691 /* truncated case */
1692 if (a[0] == 0 && a - a0 == alen - 1)
1693 return 1;
1694 if (b[0] == 0 && b - b0 == blen - 1)
1695 return 1;
1696 if (a[0] == 0 || b[0] == 0)
1697 return 0;
1698
1699 if (a[0] != b[0])
1700 return 0;
1701 l = a[0];
1702 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1703 return 0;
1704 if (bcmp(a + 1, b + 1, l) != 0)
1705 return 0;
1706
1707 a += 1 + l;
1708 b += 1 + l;
1709 }
1710
1711 if (a - a0 == alen && b - b0 == blen)
1712 return 1;
1713 else
1714 return 0;
1715 }
1716
1717 /*
1718 * calculate the number of addresses to be returned in the node info reply.
1719 */
1720 static int
1721 ni6_addrs(ni6, ifpp, subj)
1722 struct icmp6_nodeinfo *ni6;
1723 struct ifnet **ifpp;
1724 char *subj;
1725 {
1726 struct ifnet *ifp;
1727 struct in6_ifaddr *ifa6;
1728 struct ifaddr *ifa;
1729 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
1730 int addrs = 0, addrsofif, iffound = 0;
1731 int niflags = ni6->ni_flags;
1732
1733 if (ifpp != NULL)
1734 *ifpp = NULL;
1735
1736 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1737 switch (ni6->ni_code) {
1738 case ICMP6_NI_SUBJ_IPV6:
1739 if (subj == NULL) /* must be impossible... */
1740 return(0);
1741 subj_ip6 = (struct sockaddr_in6 *)(void *)subj;
1742 break;
1743 default:
1744 /*
1745 * XXX: we only support IPv6 subject address for
1746 * this Qtype.
1747 */
1748 return (0);
1749 }
1750 }
1751
1752 ifnet_head_lock_shared();
1753 TAILQ_FOREACH(ifp, &ifnet_head, if_list) {
1754 addrsofif = 0;
1755 ifnet_lock_shared(ifp);
1756 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1757 {
1758 IFA_LOCK(ifa);
1759 if (ifa->ifa_addr->sa_family != AF_INET6) {
1760 IFA_UNLOCK(ifa);
1761 continue;
1762 }
1763 ifa6 = (struct in6_ifaddr *)ifa;
1764
1765 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1766 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
1767 &ifa6->ia_addr.sin6_addr))
1768 iffound = 1;
1769
1770 /*
1771 * IPv4-mapped addresses can only be returned by a
1772 * Node Information proxy, since they represent
1773 * addresses of IPv4-only nodes, which perforce do
1774 * not implement this protocol.
1775 * [icmp-name-lookups-07, Section 5.4]
1776 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1777 * this function at this moment.
1778 */
1779
1780 /* What do we have to do about ::1? */
1781 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1782 case IPV6_ADDR_SCOPE_LINKLOCAL:
1783 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) {
1784 IFA_UNLOCK(ifa);
1785 continue;
1786 }
1787 break;
1788 case IPV6_ADDR_SCOPE_SITELOCAL:
1789 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) {
1790 IFA_UNLOCK(ifa);
1791 continue;
1792 }
1793 break;
1794 case IPV6_ADDR_SCOPE_GLOBAL:
1795 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) {
1796 IFA_UNLOCK(ifa);
1797 continue;
1798 }
1799 break;
1800 default:
1801 IFA_UNLOCK(ifa);
1802 continue;
1803 }
1804
1805 /*
1806 * check if anycast is okay.
1807 * XXX: just experimental. not in the spec.
1808 */
1809 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1810 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) {
1811 IFA_UNLOCK(ifa);
1812 continue; /* we need only unicast addresses */
1813 }
1814 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1815 (icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
1816 IFA_UNLOCK(ifa);
1817 continue;
1818 }
1819 addrsofif++; /* count the address */
1820 IFA_UNLOCK(ifa);
1821 }
1822 ifnet_lock_done(ifp);
1823 if (iffound) {
1824 if (ifpp != NULL) {
1825 *ifpp = ifp;
1826 ifnet_reference(ifp);
1827 }
1828 ifnet_head_done();
1829 return(addrsofif);
1830 }
1831
1832 addrs += addrsofif;
1833 }
1834 ifnet_head_done();
1835
1836 return (addrs);
1837 }
1838
1839 static int
1840 ni6_store_addrs(ni6, nni6, ifp0, resid)
1841 struct icmp6_nodeinfo *ni6, *nni6;
1842 struct ifnet *ifp0;
1843 int resid;
1844 {
1845 struct ifnet *ifp = ifp0;
1846 struct in6_ifaddr *ifa6;
1847 struct ifaddr *ifa;
1848 struct ifnet *ifp_dep = NULL;
1849 int copied = 0, allow_deprecated = 0;
1850 u_char *cp = (u_char *)(nni6 + 1);
1851 int niflags = ni6->ni_flags;
1852 u_int32_t ltime;
1853 uint64_t now = net_uptime();
1854
1855 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1856 return (0); /* needless to copy */
1857
1858 again:
1859
1860 ifnet_head_lock_shared();
1861 if (ifp == NULL)
1862 ifp = TAILQ_FIRST(&ifnet_head);
1863
1864 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
1865 ifnet_lock_shared(ifp);
1866 for (ifa = ifp->if_addrlist.tqh_first; ifa;
1867 ifa = ifa->ifa_list.tqe_next) {
1868 struct in6_addrlifetime_i *lt;
1869
1870 IFA_LOCK(ifa);
1871 if (ifa->ifa_addr->sa_family != AF_INET6) {
1872 IFA_UNLOCK(ifa);
1873 continue;
1874 }
1875 ifa6 = (struct in6_ifaddr *)ifa;
1876
1877 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
1878 allow_deprecated == 0) {
1879 /*
1880 * prefererred address should be put before
1881 * deprecated addresses.
1882 */
1883
1884 /* record the interface for later search */
1885 if (ifp_dep == NULL)
1886 ifp_dep = ifp;
1887
1888 IFA_UNLOCK(ifa);
1889 continue;
1890 } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
1891 allow_deprecated != 0) {
1892 IFA_UNLOCK(ifa);
1893 continue; /* we now collect deprecated addrs */
1894 }
1895 /* What do we have to do about ::1? */
1896 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1897 case IPV6_ADDR_SCOPE_LINKLOCAL:
1898 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) {
1899 IFA_UNLOCK(ifa);
1900 continue;
1901 }
1902 break;
1903 case IPV6_ADDR_SCOPE_SITELOCAL:
1904 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) {
1905 IFA_UNLOCK(ifa);
1906 continue;
1907 }
1908 break;
1909 case IPV6_ADDR_SCOPE_GLOBAL:
1910 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) {
1911 IFA_UNLOCK(ifa);
1912 continue;
1913 }
1914 break;
1915 default:
1916 IFA_UNLOCK(ifa);
1917 continue;
1918 }
1919
1920 /*
1921 * check if anycast is okay.
1922 * XXX: just experimental. not in the spec.
1923 */
1924 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1925 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) {
1926 IFA_UNLOCK(ifa);
1927 continue;
1928 }
1929 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1930 (icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
1931 IFA_UNLOCK(ifa);
1932 continue;
1933 }
1934
1935 /* now we can copy the address */
1936 if (resid < sizeof(struct in6_addr) +
1937 sizeof(u_int32_t)) {
1938 IFA_UNLOCK(ifa);
1939 /*
1940 * We give up much more copy.
1941 * Set the truncate flag and return.
1942 */
1943 nni6->ni_flags |=
1944 NI_NODEADDR_FLAG_TRUNCATE;
1945 ifnet_lock_done(ifp);
1946 ifnet_head_done();
1947 return(copied);
1948 }
1949
1950 /*
1951 * Set the TTL of the address.
1952 * The TTL value should be one of the following
1953 * according to the specification:
1954 *
1955 * 1. The remaining lifetime of a DHCP lease on the
1956 * address, or
1957 * 2. The remaining Valid Lifetime of a prefix from
1958 * which the address was derived through Stateless
1959 * Autoconfiguration.
1960 *
1961 * Note that we currently do not support stateful
1962 * address configuration by DHCPv6, so the former
1963 * case can't happen.
1964 */
1965 lt = &ifa6->ia6_lifetime;
1966 if (lt->ia6ti_expire == 0) {
1967 ltime = ND6_INFINITE_LIFETIME;
1968 } else {
1969 if (lt->ia6ti_expire > now)
1970 ltime = htonl(lt->ia6ti_expire - now);
1971 else
1972 ltime = 0;
1973 }
1974
1975 bcopy(&ltime, cp, sizeof(u_int32_t));
1976 cp += sizeof(u_int32_t);
1977
1978 /* copy the address itself */
1979 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1980 sizeof(struct in6_addr));
1981 /* XXX: KAME link-local hack; remove ifindex */
1982 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr))
1983 ((struct in6_addr *)(void *)cp)->s6_addr16[1] = 0;
1984 cp += sizeof(struct in6_addr);
1985
1986 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1987 copied += (sizeof(struct in6_addr) +
1988 sizeof(u_int32_t));
1989 IFA_UNLOCK(ifa);
1990 }
1991 ifnet_lock_done(ifp);
1992 if (ifp0) /* we need search only on the specified IF */
1993 break;
1994 }
1995 ifnet_head_done();
1996
1997 if (allow_deprecated == 0 && ifp_dep != NULL) {
1998 ifp = ifp_dep;
1999 allow_deprecated = 1;
2000
2001 goto again;
2002 }
2003
2004 return(copied);
2005 }
2006
2007 /*
2008 * XXX almost dup'ed code with rip6_input.
2009 */
2010 static int
2011 icmp6_rip6_input(mp, off)
2012 struct mbuf **mp;
2013 int off;
2014 {
2015 struct mbuf *m = *mp;
2016 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2017 struct in6pcb *in6p;
2018 struct in6pcb *last = NULL;
2019 struct sockaddr_in6 rip6src;
2020 struct icmp6_hdr *icmp6;
2021 struct mbuf *opts = NULL;
2022 int ret = 0;
2023 struct ifnet *ifp = m->m_pkthdr.rcvif;
2024
2025 #ifndef PULLDOWN_TEST
2026 /* this is assumed to be safe. */
2027 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
2028 #else
2029 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
2030 if (icmp6 == NULL) {
2031 /* m is already reclaimed */
2032 return IPPROTO_DONE;
2033 }
2034 #endif
2035
2036 /*
2037 * XXX: the address may have embedded scope zone ID, which should be
2038 * hidden from applications.
2039 */
2040 bzero(&rip6src, sizeof(rip6src));
2041 rip6src.sin6_family = AF_INET6;
2042 rip6src.sin6_len = sizeof(struct sockaddr_in6);
2043 rip6src.sin6_addr = ip6->ip6_src;
2044 if (sa6_recoverscope(&rip6src, TRUE))
2045 return (IPPROTO_DONE);
2046
2047 lck_rw_lock_shared(ripcbinfo.ipi_lock);
2048 LIST_FOREACH(in6p, &ripcb, inp_list)
2049 {
2050 if ((in6p->inp_vflag & INP_IPV6) == 0)
2051 continue;
2052 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
2053 continue;
2054 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
2055 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
2056 continue;
2057 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
2058 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
2059 continue;
2060 if (in6p->in6p_icmp6filt
2061 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
2062 in6p->in6p_icmp6filt))
2063 continue;
2064
2065 if (inp_restricted_recv(in6p, ifp))
2066 continue;
2067
2068 if (last) {
2069 struct mbuf *n;
2070 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
2071 if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
2072 (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
2073 (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) {
2074 ret = ip6_savecontrol(last, n, &opts);
2075 if (ret != 0) {
2076 m_freem(n);
2077 m_freem(opts);
2078 last = in6p;
2079 continue;
2080 }
2081 }
2082 /* strip intermediate headers */
2083 m_adj(n, off);
2084 so_recv_data_stat(last->in6p_socket, m, 0);
2085 if (sbappendaddr(&last->in6p_socket->so_rcv,
2086 (struct sockaddr *)&rip6src,
2087 n, opts, NULL) != 0) {
2088 sorwakeup(last->in6p_socket);
2089 }
2090 opts = NULL;
2091 }
2092 }
2093 last = in6p;
2094 }
2095 if (last) {
2096 if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
2097 (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
2098 (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) {
2099 ret = ip6_savecontrol(last, m, &opts);
2100 if (ret != 0) {
2101 goto error;
2102 }
2103 }
2104 /* strip intermediate headers */
2105 m_adj(m, off);
2106 so_recv_data_stat(last->in6p_socket, m, 0);
2107 if (sbappendaddr(&last->in6p_socket->so_rcv,
2108 (struct sockaddr *)&rip6src, m, opts, NULL) != 0) {
2109 sorwakeup(last->in6p_socket);
2110 }
2111 } else {
2112 goto error;
2113 }
2114 lck_rw_done(ripcbinfo.ipi_lock);
2115 return IPPROTO_DONE;
2116
2117 error:
2118 lck_rw_done(ripcbinfo.ipi_lock);
2119 m_freem(m);
2120 m_freem(opts);
2121 ip6stat.ip6s_delivered--;
2122 return IPPROTO_DONE;
2123 }
2124
2125 /*
2126 * Reflect the ip6 packet back to the source.
2127 * OFF points to the icmp6 header, counted from the top of the mbuf.
2128 */
2129 void
2130 icmp6_reflect(m, off)
2131 struct mbuf *m;
2132 size_t off;
2133 {
2134 struct mbuf *m_ip6hdr = m;
2135 struct ip6_hdr *ip6;
2136 struct icmp6_hdr *icmp6;
2137 struct in6_ifaddr *ia;
2138 struct in6_addr t, src_storage, *src = 0;
2139 int plen;
2140 int type, code;
2141 struct ifnet *outif = NULL;
2142 struct sockaddr_in6 sa6_src, sa6_dst;
2143 struct nd_ifinfo *ndi;
2144 u_int32_t oflow;
2145 struct ip6_out_args ip6oa = { IFSCOPE_NONE, { 0 },
2146 IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR, 0 };
2147
2148 if (!(m->m_pkthdr.pkt_flags & PKTF_LOOP) && m->m_pkthdr.rcvif != NULL) {
2149 ip6oa.ip6oa_boundif = m->m_pkthdr.rcvif->if_index;
2150 ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
2151 }
2152
2153 /* too short to reflect */
2154 if (off < sizeof(struct ip6_hdr)) {
2155 nd6log((LOG_DEBUG,
2156 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2157 (u_int32_t)off, (u_int32_t)sizeof(struct ip6_hdr),
2158 __FILE__, __LINE__));
2159 goto bad;
2160 }
2161
2162 /*
2163 * If there are extra headers between IPv6 and ICMPv6, strip
2164 * off that header first.
2165 */
2166 if (off > sizeof(struct ip6_hdr)) {
2167 size_t l;
2168 struct ip6_hdr nip6;
2169
2170 l = off - sizeof(struct ip6_hdr);
2171 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2172 m_adj(m, l);
2173 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2174 if (m->m_len < l) {
2175 if ((m_ip6hdr = m_pulldown(m, 0, l, NULL)) == NULL)
2176 return;
2177 }
2178 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2179 } else /* off == sizeof(struct ip6_hdr) */ {
2180 size_t l;
2181 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2182 if (m->m_len < l) {
2183 if ((m_ip6hdr = m_pulldown(m, 0, l, NULL)) == NULL)
2184 return;
2185 }
2186 }
2187 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
2188 ip6 = mtod(m_ip6hdr, struct ip6_hdr *);
2189 ip6->ip6_nxt = IPPROTO_ICMPV6;
2190 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
2191 type = icmp6->icmp6_type; /* keep type for statistics */
2192 code = icmp6->icmp6_code; /* ditto. */
2193
2194 t = ip6->ip6_dst;
2195 /*
2196 * ip6_input() drops a packet if its src is multicast.
2197 * So, the src is never multicast.
2198 */
2199 ip6->ip6_dst = ip6->ip6_src;
2200
2201 /*
2202 * XXX: make sure to embed scope zone information, using
2203 * already embedded IDs or the received interface (if any).
2204 * Note that rcvif may be NULL.
2205 */
2206 bzero(&sa6_src, sizeof(sa6_src));
2207 sa6_src.sin6_family = AF_INET6;
2208 sa6_src.sin6_len = sizeof(sa6_src);
2209 sa6_src.sin6_addr = ip6->ip6_dst;
2210 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
2211 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL, NULL);
2212 bzero(&sa6_dst, sizeof(sa6_dst));
2213 sa6_dst.sin6_family = AF_INET6;
2214 sa6_dst.sin6_len = sizeof(sa6_dst);
2215 sa6_dst.sin6_addr = t;
2216 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
2217 in6_embedscope(&t, &sa6_dst, NULL, NULL, NULL);
2218
2219 /*
2220 * If the incoming packet was addressed directly to us(i.e. unicast),
2221 * use dst as the src for the reply.
2222 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
2223 * (for example) when we encounter an error while forwarding procedure
2224 * destined to a duplicated address of ours.
2225 * Note that ip6_getdstifaddr() may fail if we are in an error handling
2226 * procedure of an outgoing packet of our own, in which case we need
2227 * to search in the ifaddr list.
2228 */
2229 lck_rw_lock_shared(&in6_ifaddr_rwlock);
2230 for (ia = in6_ifaddrs; ia; ia = ia->ia_next) {
2231 IFA_LOCK(&ia->ia_ifa);
2232 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
2233 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2234 IFA_UNLOCK(&ia->ia_ifa);
2235 src = &t;
2236 break;
2237 }
2238 IFA_UNLOCK(&ia->ia_ifa);
2239 }
2240 lck_rw_done(&in6_ifaddr_rwlock);
2241 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) &&
2242 ((m->m_flags & M_LOOP) || (m->m_pkthdr.pkt_flags & PKTF_LOOP))) {
2243 /*
2244 * This is the case if the dst is our link-local address
2245 * and the sender is also ourselves. Here we test for both
2246 * M_LOOP and PKTF_LOOP, since the former may have been set
2247 * in ip6_output() and that we get here as part of callling
2248 * ip6_process_hopopts(). See comments in <sys/mbuf.h>
2249 */
2250 src = &t;
2251 }
2252
2253 if (src == NULL) {
2254 int e;
2255 struct sockaddr_in6 sin6;
2256 struct route_in6 ro;
2257
2258 /*
2259 * This case matches to multicasts, our anycast, or unicasts
2260 * that we do not own. Select a source address based on the
2261 * source address of the erroneous packet.
2262 */
2263 bzero(&sin6, sizeof(sin6));
2264 sin6.sin6_family = AF_INET6;
2265 sin6.sin6_len = sizeof(sin6);
2266 sin6.sin6_addr = ip6->ip6_dst; /* zone ID should be embedded */
2267
2268 bzero(&ro, sizeof(ro));
2269 /*
2270 * in6_selectsrc() might return outif with its reference held
2271 * even in the error case, so we always need to release it
2272 * if non-NULL.
2273 */
2274 src = in6_selectsrc(&sin6, NULL, NULL, &ro, &outif,
2275 &src_storage, ip6oa.ip6oa_boundif, &e);
2276 ROUTE_RELEASE(&ro);
2277 if (src == NULL) {
2278 nd6log((LOG_DEBUG,
2279 "icmp6_reflect: source can't be determined: "
2280 "dst=%s, error=%d\n",
2281 ip6_sprintf(&sa6_src.sin6_addr), e));
2282 goto bad;
2283 }
2284 }
2285 oflow = ip6->ip6_flow; /* Save for later */
2286 ip6->ip6_src = *src;
2287 ip6->ip6_flow = 0;
2288 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2289 ip6->ip6_vfc |= IPV6_VERSION;
2290 if (icmp6->icmp6_type == ICMP6_ECHO_REPLY && icmp6->icmp6_code == 0) {
2291 ip6->ip6_flow |= (oflow & htonl(0x0ff00000));
2292 }
2293 ip6->ip6_nxt = IPPROTO_ICMPV6;
2294 lck_rw_lock_shared(nd_if_rwlock);
2295 if (outif != NULL && (ndi = ND_IFINFO(outif)) != NULL &&
2296 ndi->initialized) {
2297 lck_mtx_lock(&ndi->lock);
2298 ip6->ip6_hlim = ndi->chlim;
2299 lck_mtx_unlock(&ndi->lock);
2300 }
2301 if (m->m_pkthdr.rcvif != NULL &&
2302 (ndi = ND_IFINFO(m->m_pkthdr.rcvif)) != NULL &&
2303 ndi->initialized) {
2304 /* XXX: This may not be the outgoing interface */
2305 lck_mtx_lock(&ndi->lock);
2306 ip6->ip6_hlim = ndi->chlim;
2307 lck_mtx_unlock(&ndi->lock);
2308 } else {
2309 ip6->ip6_hlim = ip6_defhlim;
2310 }
2311 lck_rw_done(nd_if_rwlock);
2312 /* Use the same traffic class as in the request to match IPv4 */
2313 icmp6->icmp6_cksum = 0;
2314 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2315 sizeof(struct ip6_hdr), plen);
2316
2317 /*
2318 * XXX option handling
2319 */
2320
2321 m->m_flags &= ~(M_BCAST|M_MCAST);
2322
2323 if (outif != NULL) {
2324 ifnet_release(outif);
2325 outif = NULL;
2326 }
2327 m->m_pkthdr.rcvif = NULL;
2328 m->m_pkthdr.csum_data = 0;
2329 m->m_pkthdr.csum_flags = 0;
2330 ip6_output(m, NULL, NULL, IPV6_OUTARGS, NULL, &outif, &ip6oa);
2331 if (outif != NULL) {
2332 icmp6_ifoutstat_inc(outif, type, code);
2333 ifnet_release(outif);
2334 }
2335 return;
2336
2337 bad:
2338 m_freem(m);
2339 if (outif != NULL)
2340 ifnet_release(outif);
2341 return;
2342 }
2343
2344 static const char *
2345 icmp6_redirect_diag(src6, dst6, tgt6)
2346 struct in6_addr *src6;
2347 struct in6_addr *dst6;
2348 struct in6_addr *tgt6;
2349 {
2350 static char buf[1024];
2351 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2352 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
2353 return buf;
2354 }
2355
2356 void
2357 icmp6_redirect_input(m, off)
2358 struct mbuf *m;
2359 int off;
2360 {
2361 struct ifnet *ifp = m->m_pkthdr.rcvif;
2362 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2363 struct nd_redirect *nd_rd;
2364 int icmp6len = ntohs(ip6->ip6_plen);
2365 char *lladdr = NULL;
2366 int lladdrlen = 0;
2367 u_char *redirhdr = NULL;
2368 int redirhdrlen = 0;
2369 struct rtentry *rt = NULL;
2370 int is_router;
2371 int is_onlink;
2372 struct in6_addr src6 = ip6->ip6_src;
2373 struct in6_addr redtgt6;
2374 struct in6_addr reddst6;
2375 union nd_opts ndopts;
2376
2377 if (!m || !ifp)
2378 return;
2379
2380 /*
2381 * If we are an advertising router on this interface,
2382 * don't update route by icmp6 redirect.
2383 */
2384 if (ifp->if_eflags & IFEF_IPV6_ROUTER)
2385 goto freeit;
2386 if (!icmp6_rediraccept)
2387 goto freeit;
2388
2389 #ifndef PULLDOWN_TEST
2390 IP6_EXTHDR_CHECK(m, off, icmp6len, return);
2391 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2392 #else
2393 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2394 if (nd_rd == NULL) {
2395 icmp6stat.icp6s_tooshort++;
2396 return;
2397 }
2398 #endif
2399 redtgt6 = nd_rd->nd_rd_target;
2400 reddst6 = nd_rd->nd_rd_dst;
2401
2402 if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) ||
2403 in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) {
2404 goto freeit;
2405 }
2406
2407 /* validation */
2408 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2409 nd6log((LOG_ERR,
2410 "ICMP6 redirect sent from %s rejected; "
2411 "must be from linklocal\n", ip6_sprintf(&src6)));
2412 goto bad;
2413 }
2414 if (ip6->ip6_hlim != 255) {
2415 nd6log((LOG_ERR,
2416 "ICMP6 redirect sent from %s rejected; "
2417 "hlim=%d (must be 255)\n",
2418 ip6_sprintf(&src6), ip6->ip6_hlim));
2419 goto bad;
2420 }
2421 {
2422 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2423 struct sockaddr_in6 sin6;
2424 struct in6_addr *gw6;
2425
2426 bzero(&sin6, sizeof(sin6));
2427 sin6.sin6_family = AF_INET6;
2428 sin6.sin6_len = sizeof(struct sockaddr_in6);
2429 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
2430 rt = rtalloc1_scoped((struct sockaddr *)&sin6, 0, 0, ifp->if_index);
2431 if (rt) {
2432 RT_LOCK(rt);
2433 if (rt->rt_gateway == NULL ||
2434 rt->rt_gateway->sa_family != AF_INET6) {
2435 nd6log((LOG_ERR,
2436 "ICMP6 redirect rejected; no route "
2437 "with inet6 gateway found for redirect dst: %s\n",
2438 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2439 RT_UNLOCK(rt);
2440 rtfree(rt);
2441 goto bad;
2442 }
2443
2444 gw6 = &(((struct sockaddr_in6 *)(void *)
2445 rt->rt_gateway)->sin6_addr);
2446 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2447 nd6log((LOG_ERR,
2448 "ICMP6 redirect rejected; "
2449 "not equal to gw-for-src=%s (must be same): "
2450 "%s\n",
2451 ip6_sprintf(gw6),
2452 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2453 RT_UNLOCK(rt);
2454 rtfree(rt);
2455 goto bad;
2456 }
2457 } else {
2458 nd6log((LOG_ERR,
2459 "ICMP6 redirect rejected; "
2460 "no route found for redirect dst: %s\n",
2461 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2462 goto bad;
2463 }
2464 RT_UNLOCK(rt);
2465 rtfree(rt);
2466 rt = NULL;
2467 }
2468 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2469 nd6log((LOG_ERR,
2470 "ICMP6 redirect rejected; "
2471 "redirect dst must be unicast: %s\n",
2472 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2473 goto bad;
2474 }
2475
2476 is_router = is_onlink = 0;
2477 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2478 is_router = 1; /* router case */
2479 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2480 is_onlink = 1; /* on-link destination case */
2481 if (!is_router && !is_onlink) {
2482 nd6log((LOG_ERR,
2483 "ICMP6 redirect rejected; "
2484 "neither router case nor onlink case: %s\n",
2485 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2486 goto bad;
2487 }
2488 /* validation passed */
2489
2490 icmp6len -= sizeof(*nd_rd);
2491 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2492 if (nd6_options(&ndopts) < 0) {
2493 nd6log((LOG_INFO, "icmp6_redirect_input: "
2494 "invalid ND option, rejected: %s\n",
2495 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2496 /* nd6_options have incremented stats */
2497 goto freeit;
2498 }
2499
2500 if (ndopts.nd_opts_tgt_lladdr) {
2501 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2502 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2503 }
2504
2505 if (ndopts.nd_opts_rh) {
2506 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2507 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2508 }
2509
2510 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2511 nd6log((LOG_INFO,
2512 "icmp6_redirect_input: lladdrlen mismatch for %s "
2513 "(if %d, icmp6 packet %d): %s\n",
2514 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
2515 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2516 goto bad;
2517 }
2518
2519 /* RFC 2461 8.3 */
2520 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2521 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2522
2523 if (!is_onlink) { /* better router case. perform rtredirect. */
2524 /* perform rtredirect */
2525 struct sockaddr_in6 sdst;
2526 struct sockaddr_in6 sgw;
2527 struct sockaddr_in6 ssrc;
2528
2529 bzero(&sdst, sizeof(sdst));
2530 bzero(&sgw, sizeof(sgw));
2531 bzero(&ssrc, sizeof(ssrc));
2532 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2533 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2534 sizeof(struct sockaddr_in6);
2535 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2536 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2537 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2538 rtredirect(ifp, (struct sockaddr *)&sdst,
2539 (struct sockaddr *)&sgw, NULL, RTF_GATEWAY | RTF_HOST,
2540 (struct sockaddr *)&ssrc, NULL);
2541 }
2542 /* finally update cached route in each socket via pfctlinput */
2543 {
2544 struct sockaddr_in6 sdst;
2545
2546 bzero(&sdst, sizeof(sdst));
2547 sdst.sin6_family = AF_INET6;
2548 sdst.sin6_len = sizeof(struct sockaddr_in6);
2549 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2550
2551 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2552 #if IPSEC
2553 key_sa_routechange((struct sockaddr *)&sdst);
2554 #endif
2555 }
2556
2557 freeit:
2558 m_freem(m);
2559 return;
2560
2561 bad:
2562 icmp6stat.icp6s_badredirect++;
2563 m_freem(m);
2564 }
2565
2566 void
2567 icmp6_redirect_output(m0, rt)
2568 struct mbuf *m0;
2569 struct rtentry *rt;
2570 {
2571 struct ifnet *ifp; /* my outgoing interface */
2572 struct in6_addr ifp_ll6;
2573 struct in6_addr *router_ll6;
2574 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2575 struct mbuf *m = NULL; /* newly allocated one */
2576 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2577 struct nd_redirect *nd_rd;
2578 size_t maxlen;
2579 u_char *p;
2580 struct ifnet *outif = NULL;
2581 struct sockaddr_in6 src_sa;
2582 struct ip6_out_args ip6oa = { IFSCOPE_NONE, { 0 },
2583 IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR, 0 };
2584
2585 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2586
2587 if (rt != NULL)
2588 RT_LOCK(rt);
2589
2590 /* sanity check */
2591 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2592 goto fail;
2593
2594 /*
2595 * If we are not a router to begin with, or not an advertising
2596 * router on this interface, don't send icmp6 redirect.
2597 */
2598 if (!ip6_forwarding || !(ifp->if_eflags & IFEF_IPV6_ROUTER))
2599 goto fail;
2600
2601 /*
2602 * Address check:
2603 * the source address must identify a neighbor, and
2604 * the destination address must not be a multicast address
2605 * [RFC 2461, sec 8.2]
2606 */
2607 sip6 = mtod(m0, struct ip6_hdr *);
2608 bzero(&src_sa, sizeof(src_sa));
2609 src_sa.sin6_family = AF_INET6;
2610 src_sa.sin6_len = sizeof(src_sa);
2611 src_sa.sin6_addr = sip6->ip6_src;
2612 /* we don't currently use sin6_scope_id, but eventually use it */
2613 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src);
2614 RT_UNLOCK(rt);
2615 if (nd6_is_addr_neighbor(&src_sa, ifp, 0) == 0) {
2616 /* already unlocked */
2617 rt = NULL;
2618 goto fail;
2619 }
2620 RT_LOCK(rt);
2621 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2622 goto fail; /* what should we do here? */
2623
2624 /* rate limit */
2625 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2626 goto fail;
2627
2628 /*
2629 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2630 * we almost always ask for an mbuf cluster for simplicity.
2631 * (MHLEN < IPV6_MMTU is almost always true)
2632 */
2633 #if IPV6_MMTU >= MCLBYTES
2634 # error assumption failed about IPV6_MMTU and MCLBYTES
2635 #endif
2636 MGETHDR(m, M_DONTWAIT, MT_HEADER); /* MAC-OK */
2637 if (m && IPV6_MMTU >= MHLEN)
2638 MCLGET(m, M_DONTWAIT);
2639 if (!m)
2640 goto fail;
2641 m->m_pkthdr.rcvif = NULL;
2642 m->m_len = 0;
2643 maxlen = M_TRAILINGSPACE(m);
2644 maxlen = min(IPV6_MMTU, maxlen);
2645 /* just for safety */
2646 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2647 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2648 goto fail;
2649 }
2650
2651 {
2652 /* get ip6 linklocal address for ifp(my outgoing interface). */
2653 struct in6_ifaddr *ia;
2654 if ((ia = in6ifa_ifpforlinklocal(ifp,
2655 IN6_IFF_NOTREADY|
2656 IN6_IFF_ANYCAST)) == NULL)
2657 goto fail;
2658 IFA_LOCK(&ia->ia_ifa);
2659 ifp_ll6 = ia->ia_addr.sin6_addr;
2660 IFA_UNLOCK(&ia->ia_ifa);
2661 IFA_REMREF(&ia->ia_ifa);
2662 }
2663
2664 /* get ip6 linklocal address for the router. */
2665 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2666 struct sockaddr_in6 *sin6;
2667 sin6 = (struct sockaddr_in6 *)(void *)rt->rt_gateway;
2668 router_ll6 = &sin6->sin6_addr;
2669 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2670 router_ll6 = (struct in6_addr *)NULL;
2671 } else
2672 router_ll6 = (struct in6_addr *)NULL;
2673
2674 /* ip6 */
2675 ip6 = mtod(m, struct ip6_hdr *);
2676 ip6->ip6_flow = 0;
2677 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2678 ip6->ip6_vfc |= IPV6_VERSION;
2679 /* ip6->ip6_plen will be set later */
2680 ip6->ip6_nxt = IPPROTO_ICMPV6;
2681 ip6->ip6_hlim = 255;
2682 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2683 bcopy(&ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2684 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2685
2686 /* ND Redirect */
2687 nd_rd = (struct nd_redirect *)(ip6 + 1);
2688 nd_rd->nd_rd_type = ND_REDIRECT;
2689 nd_rd->nd_rd_code = 0;
2690 nd_rd->nd_rd_reserved = 0;
2691 if (rt->rt_flags & RTF_GATEWAY) {
2692 /*
2693 * nd_rd->nd_rd_target must be a link-local address in
2694 * better router cases.
2695 */
2696 if (!router_ll6)
2697 goto fail;
2698 bcopy(router_ll6, &nd_rd->nd_rd_target,
2699 sizeof(nd_rd->nd_rd_target));
2700 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2701 sizeof(nd_rd->nd_rd_dst));
2702 } else {
2703 /* make sure redtgt == reddst */
2704 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2705 sizeof(nd_rd->nd_rd_target));
2706 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2707 sizeof(nd_rd->nd_rd_dst));
2708 }
2709 RT_UNLOCK(rt);
2710 rt = NULL;
2711
2712 p = (u_char *)(nd_rd + 1);
2713
2714 if (!router_ll6)
2715 goto nolladdropt;
2716
2717 {
2718 /* target lladdr option */
2719 struct rtentry *rt_router = NULL;
2720 int len;
2721 struct sockaddr_dl *sdl;
2722 struct nd_opt_hdr *nd_opt;
2723 char *lladdr;
2724
2725 /* Callee returns a locked route upon success */
2726 rt_router = nd6_lookup(router_ll6, 0, ifp, 0);
2727 if (!rt_router)
2728 goto nolladdropt;
2729 RT_LOCK_ASSERT_HELD(rt_router);
2730 len = sizeof(*nd_opt) + ifp->if_addrlen;
2731 len = (len + 7) & ~7; /* round by 8 */
2732 /* safety check */
2733 if (len + (p - (u_char *)ip6) > maxlen) {
2734 RT_REMREF_LOCKED(rt_router);
2735 RT_UNLOCK(rt_router);
2736 goto nolladdropt;
2737 }
2738
2739 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2740 (rt_router->rt_flags & RTF_LLINFO) &&
2741 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2742 (sdl = (struct sockaddr_dl *)(void *)
2743 rt_router->rt_gateway) && sdl->sdl_alen) {
2744 nd_opt = (struct nd_opt_hdr *)p;
2745 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2746 nd_opt->nd_opt_len = len >> 3;
2747 lladdr = (char *)(nd_opt + 1);
2748 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2749 p += len;
2750 }
2751 RT_REMREF_LOCKED(rt_router);
2752 RT_UNLOCK(rt_router);
2753 }
2754
2755 nolladdropt:;
2756
2757 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2758
2759 /* just to be safe */
2760 #ifdef M_DECRYPTED /*not openbsd*/
2761 if (m0->m_flags & M_DECRYPTED)
2762 goto noredhdropt;
2763 #endif
2764 if (p - (u_char *)ip6 > maxlen)
2765 goto noredhdropt;
2766
2767 {
2768 /* redirected header option */
2769 int len;
2770 struct nd_opt_rd_hdr *nd_opt_rh;
2771
2772 /*
2773 * compute the maximum size for icmp6 redirect header option.
2774 * XXX room for auth header?
2775 */
2776 len = maxlen - (p - (u_char *)ip6);
2777 len &= ~7;
2778
2779 /* This is just for simplicity. */
2780 if (m0->m_pkthdr.len != m0->m_len) {
2781 if (m0->m_next) {
2782 m_freem(m0->m_next);
2783 m0->m_next = NULL;
2784 }
2785 m0->m_pkthdr.len = m0->m_len;
2786 }
2787
2788 /*
2789 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2790 * about padding/truncate rule for the original IP packet.
2791 * From the discussion on IPv6imp in Feb 1999, the consensus was:
2792 * - "attach as much as possible" is the goal
2793 * - pad if not aligned (original size can be guessed by original
2794 * ip6 header)
2795 * Following code adds the padding if it is simple enough,
2796 * and truncates if not.
2797 */
2798 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2799 panic("assumption failed in %s:%d\n", __FILE__, __LINE__);
2800
2801 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2802 /* not enough room, truncate */
2803 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2804 } else {
2805 /* enough room, pad or truncate */
2806 size_t extra;
2807
2808 extra = m0->m_pkthdr.len % 8;
2809 if (extra) {
2810 /* pad if easy enough, truncate if not */
2811 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2812 /* pad */
2813 m0->m_len += (8 - extra);
2814 m0->m_pkthdr.len += (8 - extra);
2815 } else {
2816 /* truncate */
2817 m0->m_pkthdr.len -= extra;
2818 m0->m_len -= extra;
2819 }
2820 }
2821 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2822 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2823 }
2824
2825 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2826 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2827 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2828 nd_opt_rh->nd_opt_rh_len = len >> 3;
2829 p += sizeof(*nd_opt_rh);
2830 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2831
2832 /* connect m0 to m */
2833 m->m_next = m0;
2834 m->m_pkthdr.len = m->m_len + m0->m_len;
2835 }
2836 noredhdropt:;
2837
2838 /* XXX: clear embedded link IDs in the inner header */
2839 in6_clearscope(&sip6->ip6_src);
2840 in6_clearscope(&sip6->ip6_dst);
2841 in6_clearscope(&nd_rd->nd_rd_target);
2842 in6_clearscope(&nd_rd->nd_rd_dst);
2843
2844 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2845
2846 nd_rd->nd_rd_cksum = 0;
2847 nd_rd->nd_rd_cksum
2848 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2849
2850 /* send the packet to outside... */
2851 ip6oa.ip6oa_boundif = ifp->if_index;
2852 ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
2853
2854 ip6_output(m, NULL, NULL, IPV6_OUTARGS, NULL, &outif, &ip6oa);
2855 if (outif) {
2856 icmp6_ifstat_inc(outif, ifs6_out_msg);
2857 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2858 ifnet_release(outif);
2859 }
2860 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2861
2862 return;
2863
2864 fail:
2865 if (rt != NULL)
2866 RT_UNLOCK(rt);
2867 if (m)
2868 m_freem(m);
2869 if (m0)
2870 m_freem(m0);
2871 }
2872
2873 /*
2874 * ICMPv6 socket option processing.
2875 */
2876 int
2877 icmp6_ctloutput(so, sopt)
2878 struct socket *so;
2879 struct sockopt *sopt;
2880 {
2881 int error = 0;
2882 int optlen;
2883 struct inpcb *inp = sotoinpcb(so);
2884 int level, op, optname;
2885
2886 if (sopt) {
2887 level = sopt->sopt_level;
2888 op = sopt->sopt_dir;
2889 optname = sopt->sopt_name;
2890 optlen = sopt->sopt_valsize;
2891 } else
2892 level = op = optname = optlen = 0;
2893
2894 if (level != IPPROTO_ICMPV6) {
2895 return EINVAL;
2896 }
2897
2898 switch (op) {
2899 case PRCO_SETOPT:
2900 switch (optname) {
2901 case ICMP6_FILTER:
2902 {
2903 struct icmp6_filter *p;
2904
2905 if (optlen != 0 && optlen != sizeof(*p)) {
2906 error = EMSGSIZE;
2907 break;
2908 }
2909 if (inp->in6p_icmp6filt == NULL) {
2910 error = EINVAL;
2911 break;
2912 }
2913
2914 if (optlen == 0) {
2915 /* According to RFC 3542, an installed filter can be
2916 * cleared by issuing a setsockopt for ICMP6_FILTER
2917 * with a zero length.
2918 */
2919 ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
2920 } else {
2921 error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen,
2922 optlen);
2923 }
2924 break;
2925 }
2926
2927 default:
2928 error = ENOPROTOOPT;
2929 break;
2930 }
2931 break;
2932
2933 case PRCO_GETOPT:
2934 switch (optname) {
2935 case ICMP6_FILTER:
2936 {
2937 if (inp->in6p_icmp6filt == NULL) {
2938 error = EINVAL;
2939 break;
2940 }
2941 error = sooptcopyout(sopt, inp->in6p_icmp6filt,
2942 min(sizeof(struct icmp6_filter), optlen));
2943 break;
2944 }
2945
2946 default:
2947 error = ENOPROTOOPT;
2948 break;
2949 }
2950 break;
2951 }
2952
2953 return(error);
2954 }
2955
2956 /*
2957 * ICMPv6 socket datagram option processing.
2958 */
2959 int
2960 icmp6_dgram_ctloutput(struct socket *so, struct sockopt *sopt)
2961 {
2962 if (kauth_cred_issuser(so->so_cred))
2963 return icmp6_ctloutput(so, sopt);
2964
2965 if (sopt->sopt_level == IPPROTO_ICMPV6) {
2966 switch (sopt->sopt_name) {
2967 case ICMP6_FILTER:
2968 return icmp6_ctloutput(so, sopt);
2969 default:
2970 return EPERM;
2971 }
2972 }
2973
2974 if (sopt->sopt_level != IPPROTO_IPV6)
2975 return EINVAL;
2976
2977 switch (sopt->sopt_name) {
2978 case IPV6_UNICAST_HOPS:
2979 case IPV6_CHECKSUM:
2980 case IPV6_V6ONLY:
2981 case IPV6_USE_MIN_MTU:
2982 case IPV6_RECVRTHDR:
2983 case IPV6_RECVPKTINFO:
2984 case IPV6_RECVHOPLIMIT:
2985 case IPV6_PATHMTU:
2986 case IPV6_PKTINFO:
2987 case IPV6_HOPLIMIT:
2988 case IPV6_HOPOPTS:
2989 case IPV6_DSTOPTS:
2990 case IPV6_MULTICAST_IF:
2991 case IPV6_MULTICAST_HOPS:
2992 case IPV6_MULTICAST_LOOP:
2993 case IPV6_JOIN_GROUP:
2994 case IPV6_LEAVE_GROUP:
2995 case IPV6_PORTRANGE:
2996 case IPV6_IPSEC_POLICY:
2997 case IPV6_RECVTCLASS:
2998 case IPV6_TCLASS:
2999 case IPV6_2292PKTOPTIONS:
3000 case IPV6_2292PKTINFO:
3001 case IPV6_2292HOPLIMIT:
3002 case IPV6_2292HOPOPTS:
3003 case IPV6_2292DSTOPTS:
3004 case IPV6_2292RTHDR:
3005 case IPV6_BOUND_IF:
3006 case IPV6_NO_IFT_CELLULAR:
3007
3008 return ip6_ctloutput(so, sopt);
3009
3010 default:
3011 return EPERM;
3012 }
3013 }
3014
3015 __private_extern__ int
3016 icmp6_dgram_send(struct socket *so, int flags, struct mbuf *m,
3017 struct sockaddr *nam, struct mbuf *control, struct proc *p)
3018 {
3019 #pragma unused(flags, p)
3020 int error = 0;
3021 struct inpcb *inp = sotoinpcb(so);
3022 struct sockaddr_in6 tmp;
3023 struct sockaddr_in6 *dst = (struct sockaddr_in6 *)(void *)nam;
3024 struct icmp6_hdr *icmp6;
3025
3026 if (inp == NULL
3027 #if NECP
3028 || (necp_socket_should_use_flow_divert(inp))
3029 #endif /* NECP */
3030 ) {
3031 error = (inp == NULL ? EINVAL : EPROTOTYPE);
3032 goto bad;
3033 }
3034
3035 if (kauth_cred_issuser(so->so_cred))
3036 return (rip6_output(m, so, SIN6(nam), control, 0));
3037
3038 /* always copy sockaddr to avoid overwrites */
3039 if (so->so_state & SS_ISCONNECTED) {
3040 if (nam != NULL) {
3041 error = EISCONN;
3042 goto bad;
3043 }
3044 /* XXX */
3045 bzero(&tmp, sizeof(tmp));
3046 tmp.sin6_family = AF_INET6;
3047 tmp.sin6_len = sizeof(struct sockaddr_in6);
3048 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
3049 sizeof(struct in6_addr));
3050 dst = &tmp;
3051 } else {
3052 if (nam == NULL) {
3053 error = ENOTCONN;
3054 goto bad;
3055 }
3056 tmp = *(struct sockaddr_in6 *)(void *)nam;
3057 dst = &tmp;
3058 }
3059
3060 /*
3061 * For an ICMPv6 packet, we should know its type and code
3062 */
3063 if (SOCK_PROTO(so) == IPPROTO_ICMPV6) {
3064 if (m->m_len < sizeof(struct icmp6_hdr) &&
3065 (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
3066 error = ENOBUFS;
3067 goto bad;
3068 }
3069 icmp6 = mtod(m, struct icmp6_hdr *);
3070
3071 /*
3072 * Allow only to send echo request and node information request
3073 * See RFC 2463 for Echo Request Message format
3074 */
3075 if ((icmp6->icmp6_type == ICMP6_ECHO_REQUEST &&
3076 icmp6->icmp6_code == 0) ||
3077 (icmp6->icmp6_type == ICMP6_NI_QUERY &&
3078 (icmp6->icmp6_code == ICMP6_NI_SUBJ_IPV6 ||
3079 icmp6->icmp6_code == ICMP6_NI_SUBJ_FQDN))) {
3080 /* Good */
3081 ;
3082 } else {
3083 error = EPERM;
3084 goto bad;
3085 }
3086 }
3087
3088 #if ENABLE_DEFAULT_SCOPE
3089 if (dst->sin6_scope_id == 0) { /* not change if specified */
3090 dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr);
3091 }
3092 #endif
3093
3094 return (rip6_output(m, so, dst, control, 0));
3095 bad:
3096 VERIFY(error != 0);
3097
3098 if (m != NULL)
3099 m_freem(m);
3100 if (control != NULL)
3101 m_freem(control);
3102
3103 return (error);
3104 }
3105
3106 /* Like rip6_attach but without root privilege enforcement */
3107 __private_extern__ int
3108 icmp6_dgram_attach(struct socket *so, int proto, struct proc *p)
3109 {
3110 struct inpcb *inp;
3111 int error;
3112
3113 inp = sotoinpcb(so);
3114 if (inp)
3115 panic("icmp6_dgram_attach");
3116
3117 if (proto != IPPROTO_ICMPV6)
3118 return EINVAL;
3119
3120 error = soreserve(so, rip_sendspace, rip_recvspace);
3121 if (error)
3122 return error;
3123 error = in_pcballoc(so, &ripcbinfo, p);
3124 if (error)
3125 return error;
3126 inp = (struct inpcb *)so->so_pcb;
3127 inp->inp_vflag |= INP_IPV6;
3128 inp->in6p_ip6_nxt = IPPROTO_ICMPV6;
3129 inp->in6p_hops = -1; /* use kernel default */
3130 inp->in6p_cksum = -1;
3131 MALLOC(inp->in6p_icmp6filt, struct icmp6_filter *,
3132 sizeof(struct icmp6_filter), M_PCB, M_WAITOK);
3133 if (inp->in6p_icmp6filt == NULL)
3134 return (ENOMEM);
3135 ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
3136 return 0;
3137 }
3138
3139
3140 /*
3141 * Perform rate limit check.
3142 * Returns 0 if it is okay to send the icmp6 packet.
3143 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
3144 * limitation.
3145 *
3146 * XXX per-destination check necessary?
3147 */
3148 static int
3149 icmp6_ratelimit(
3150 __unused const struct in6_addr *dst, /* not used at this moment */
3151 const int type,
3152 __unused const int code)
3153 {
3154 int ret;
3155
3156 ret = 0; /* okay to send */
3157
3158 /* PPS limit */
3159 if (type == ND_ROUTER_ADVERT) {
3160 if (!ppsratecheck(&icmp6rappslim_last, &icmp6rapps_count,
3161 icmp6rappslim))
3162 ret++;
3163 } else if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
3164 icmp6errppslim)) {
3165 /* The packet is subject to rate limit */
3166 ret++;
3167 }
3168
3169 return ret;
3170 }
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