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1 /*
2 * Copyright (c) 2000-2018 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(struct icmp6errstat *stat, int type, int code)
194 {
195 switch (type) {
196 case ICMP6_DST_UNREACH:
197 switch (code) {
198 case ICMP6_DST_UNREACH_NOROUTE:
199 stat->icp6errs_dst_unreach_noroute++;
200 return;
201 case ICMP6_DST_UNREACH_ADMIN:
202 stat->icp6errs_dst_unreach_admin++;
203 return;
204 case ICMP6_DST_UNREACH_BEYONDSCOPE:
205 stat->icp6errs_dst_unreach_beyondscope++;
206 return;
207 case ICMP6_DST_UNREACH_ADDR:
208 stat->icp6errs_dst_unreach_addr++;
209 return;
210 case ICMP6_DST_UNREACH_NOPORT:
211 stat->icp6errs_dst_unreach_noport++;
212 return;
213 }
214 break;
215 case ICMP6_PACKET_TOO_BIG:
216 stat->icp6errs_packet_too_big++;
217 return;
218 case ICMP6_TIME_EXCEEDED:
219 switch (code) {
220 case ICMP6_TIME_EXCEED_TRANSIT:
221 stat->icp6errs_time_exceed_transit++;
222 return;
223 case ICMP6_TIME_EXCEED_REASSEMBLY:
224 stat->icp6errs_time_exceed_reassembly++;
225 return;
226 }
227 break;
228 case ICMP6_PARAM_PROB:
229 switch (code) {
230 case ICMP6_PARAMPROB_HEADER:
231 stat->icp6errs_paramprob_header++;
232 return;
233 case ICMP6_PARAMPROB_NEXTHEADER:
234 stat->icp6errs_paramprob_nextheader++;
235 return;
236 case ICMP6_PARAMPROB_OPTION:
237 stat->icp6errs_paramprob_option++;
238 return;
239 }
240 break;
241 case ND_REDIRECT:
242 stat->icp6errs_redirect++;
243 return;
244 }
245 stat->icp6errs_unknown++;
246 }
247
248 /*
249 * A wrapper function for icmp6_error() necessary when the erroneous packet
250 * may not contain enough scope zone information.
251 */
252 void
253 icmp6_error2(struct mbuf *m, int type, int code, int param,
254 struct ifnet *ifp)
255 {
256 struct ip6_hdr *ip6;
257
258 if (ifp == NULL)
259 return;
260
261 #ifndef PULLDOWN_TEST
262 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr),return );
263 #else
264 if (m->m_len < sizeof(struct ip6_hdr)) {
265 m = m_pullup(m, sizeof(struct ip6_hdr));
266 if (m == NULL)
267 return;
268 }
269 #endif
270
271 ip6 = mtod(m, struct ip6_hdr *);
272
273 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
274 return;
275 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
276 return;
277
278 icmp6_error(m, type, code, param);
279 }
280
281 /*
282 * Generate an error packet of type error in response to bad IP6 packet.
283 */
284 void
285 icmp6_error(struct mbuf *m, int type, int code, int param) {
286 icmp6_error_flag(m, type, code, param, ICMP6_ERROR_RST_MRCVIF);
287 }
288
289 void icmp6_error_flag (struct mbuf *m, int type, int code, int param, int flags)
290 {
291 struct ip6_hdr *oip6, *nip6;
292 struct icmp6_hdr *icmp6;
293 u_int preplen;
294 int off;
295 int nxt;
296
297 icmp6stat.icp6s_error++;
298
299 /* count per-type-code statistics */
300 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
301
302 #ifdef M_DECRYPTED /*not openbsd*/
303 if (m->m_flags & M_DECRYPTED) {
304 icmp6stat.icp6s_canterror++;
305 goto freeit;
306 }
307 #endif
308
309 #ifndef PULLDOWN_TEST
310 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), return);
311 #else
312 if (m->m_len < sizeof(struct ip6_hdr)) {
313 m = m_pullup(m, sizeof(struct ip6_hdr));
314 if (m == NULL)
315 return;
316 }
317 #endif
318 oip6 = mtod(m, struct ip6_hdr *);
319
320 /*
321 * If the destination address of the erroneous packet is a multicast
322 * address, or the packet was sent using link-layer multicast,
323 * we should basically suppress sending an error (RFC 2463, Section
324 * 2.4).
325 * We have two exceptions (the item e.2 in that section):
326 * - the Pakcet Too Big message can be sent for path MTU discovery.
327 * - the Parameter Problem Message that can be allowed an icmp6 error
328 * in the option type field. This check has been done in
329 * ip6_unknown_opt(), so we can just check the type and code.
330 */
331 if ((m->m_flags & (M_BCAST|M_MCAST) ||
332 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
333 (type != ICMP6_PACKET_TOO_BIG &&
334 (type != ICMP6_PARAM_PROB ||
335 code != ICMP6_PARAMPROB_OPTION)))
336 goto freeit;
337
338 /*
339 * RFC 2463, 2.4 (e.5): source address check.
340 * XXX: the case of anycast source?
341 */
342 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
343 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
344 goto freeit;
345
346 /*
347 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
348 * don't do it.
349 */
350 nxt = -1;
351 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
352 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
353 struct icmp6_hdr *icp;
354
355 #ifndef PULLDOWN_TEST
356 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), return);
357 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
358 #else
359 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
360 sizeof(*icp));
361 if (icp == NULL) {
362 icmp6stat.icp6s_tooshort++;
363 return;
364 }
365 #endif
366 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
367 icp->icmp6_type == ND_REDIRECT) {
368 /*
369 * ICMPv6 error
370 * Special case: for redirect (which is
371 * informational) we must not send icmp6 error.
372 */
373 icmp6stat.icp6s_canterror++;
374 goto freeit;
375 } else {
376 /* ICMPv6 informational - send the error */
377 }
378 } else {
379 /* non-ICMPv6 - send the error */
380 }
381
382 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
383
384 /* Finally, do rate limitation check. */
385 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
386 icmp6stat.icp6s_toofreq++;
387 goto freeit;
388 }
389
390 /*
391 * OK, ICMP6 can be generated.
392 */
393
394 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
395 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
396
397 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
398 M_PREPEND(m, preplen, M_DONTWAIT, 1);
399 if (m && m->m_len < preplen)
400 m = m_pullup(m, preplen);
401 if (m == NULL) {
402 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
403 return;
404 }
405
406 nip6 = mtod(m, struct ip6_hdr *);
407 nip6->ip6_src = oip6->ip6_src;
408 nip6->ip6_dst = oip6->ip6_dst;
409
410 in6_clearscope(&oip6->ip6_src);
411 in6_clearscope(&oip6->ip6_dst);
412
413 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
414 icmp6->icmp6_type = type;
415 icmp6->icmp6_code = code;
416 icmp6->icmp6_pptr = htonl((u_int32_t)param);
417
418 /*
419 * icmp6_reflect() is designed to be in the input path.
420 * icmp6_error() can be called from both input and output path,
421 * and if we are in output path rcvif could contain bogus value.
422 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
423 * information in ip header (nip6).
424 */
425 if (flags & ICMP6_ERROR_RST_MRCVIF) {
426 m->m_pkthdr.rcvif = NULL;
427 }
428
429 icmp6stat.icp6s_outhist[type]++;
430 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
431
432 return;
433
434 freeit:
435 /*
436 * If we can't tell whether or not we can generate ICMP6, free it.
437 */
438 m_freem(m);
439 }
440
441 /*
442 * Process a received ICMP6 message.
443 */
444 int
445 icmp6_input(struct mbuf **mp, int *offp, int proto)
446 {
447 #pragma unused(proto)
448 struct mbuf *m = *mp, *n;
449 struct ifnet *ifp;
450 struct ip6_hdr *ip6, *nip6;
451 struct icmp6_hdr *icmp6, *nicmp6;
452 int off = *offp;
453 int icmp6len = m->m_pkthdr.len - *offp;
454 int code, sum, noff, proxy = 0;
455
456 ifp = m->m_pkthdr.rcvif;
457
458 #ifndef PULLDOWN_TEST
459 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), return IPPROTO_DONE);
460 /* m might change if M_LOOP. So, call mtod after this */
461 #endif
462
463 /* Expect 32-bit aligned data pointer on strict-align platforms */
464 MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
465
466 /*
467 * Locate icmp6 structure in mbuf, and check
468 * that not corrupted and of at least minimum length
469 */
470 ip6 = mtod(m, struct ip6_hdr *);
471 if (icmp6len < sizeof(struct icmp6_hdr)) {
472 icmp6stat.icp6s_tooshort++;
473 goto freeit;
474 }
475
476 #ifndef PULLDOWN_TEST
477 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
478 #else
479 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
480 if (icmp6 == NULL) {
481 icmp6stat.icp6s_tooshort++;
482 return IPPROTO_DONE;
483 }
484 #endif
485 code = icmp6->icmp6_code;
486
487 /*
488 * Early check for RFC 6980
489 * Drop certain NDP packets if they came in fragmented
490 */
491 switch (icmp6->icmp6_type) {
492 case ND_ROUTER_SOLICIT:
493 case ND_ROUTER_ADVERT:
494 case ND_NEIGHBOR_SOLICIT:
495 case ND_NEIGHBOR_ADVERT:
496 case ND_REDIRECT:
497 if (m->m_pkthdr.pkt_flags & PKTF_REASSEMBLED) {
498 icmp6stat.icp6s_rfc6980_drop++;
499 goto freeit;
500 }
501 break;
502 default:
503 break;
504 }
505
506 /* Apply rate limit before checksum validation. */
507 if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) {
508 icmp6stat.icp6s_toofreq++;
509 goto freeit;
510 }
511
512 /*
513 * Check multicast group membership.
514 * Note: SSM filters are not applied for ICMPv6 traffic.
515 */
516 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
517 struct in6_multi *inm;
518
519 in6_multihead_lock_shared();
520 IN6_LOOKUP_MULTI(&ip6->ip6_dst, ifp, inm);
521 in6_multihead_lock_done();
522
523 if (inm == NULL) {
524 /*
525 * Don't discard if this is a Neighbor Solicitation
526 * that needs to be proxied (see check down below.)
527 */
528 if (!(m->m_pkthdr.pkt_flags & PKTF_PROXY_DST)) {
529 ip6stat.ip6s_notmember++;
530 in6_ifstat_inc(m->m_pkthdr.rcvif,
531 ifs6_in_discard);
532 goto freeit;
533 }
534 } else {
535 IN6M_REMREF(inm);
536 }
537 }
538
539 /*
540 * calculate the checksum
541 */
542 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
543 nd6log((LOG_ERR,
544 "ICMP6 checksum error(%d|%x) %s\n",
545 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
546 icmp6stat.icp6s_checksum++;
547 goto freeit;
548 }
549
550 if (m->m_pkthdr.pkt_flags & PKTF_PROXY_DST) {
551 /*
552 * This is the special case of proxying NS (dst is either
553 * solicited-node multicast or unicast); process it locally
554 * but don't deliver it to sockets. It practically lets us
555 * steer the packet to nd6_prproxy_ns_input, where more
556 * specific tests and actions will be taken.
557 */
558 switch (icmp6->icmp6_type) {
559 case ND_NEIGHBOR_SOLICIT:
560 proxy = 1;
561 break;
562 default:
563 goto freeit;
564 }
565 }
566
567 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
568 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
569 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
570 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
571
572 switch (icmp6->icmp6_type) {
573 case ICMP6_DST_UNREACH:
574 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
575 switch (code) {
576 case ICMP6_DST_UNREACH_NOROUTE:
577 case ICMP6_DST_UNREACH_ADDR: /* PRC_HOSTDEAD is a DOS */
578 code = PRC_UNREACH_NET;
579 break;
580 case ICMP6_DST_UNREACH_ADMIN:
581 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
582 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
583 break;
584 case ICMP6_DST_UNREACH_BEYONDSCOPE:
585 /* I mean "source address was incorrect." */
586 code = PRC_PARAMPROB;
587 break;
588 case ICMP6_DST_UNREACH_NOPORT:
589 code = PRC_UNREACH_PORT;
590 break;
591 default:
592 goto badcode;
593 }
594 goto deliver;
595
596 case ICMP6_PACKET_TOO_BIG:
597 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
598
599 code = PRC_MSGSIZE;
600
601 /*
602 * Updating the path MTU will be done after examining
603 * intermediate extension headers.
604 */
605 goto deliver;
606
607 case ICMP6_TIME_EXCEEDED:
608 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
609 switch (code) {
610 case ICMP6_TIME_EXCEED_TRANSIT:
611 code = PRC_TIMXCEED_INTRANS;
612 break;
613 case ICMP6_TIME_EXCEED_REASSEMBLY:
614 code = PRC_TIMXCEED_REASS;
615 break;
616 default:
617 goto badcode;
618 }
619 goto deliver;
620
621 case ICMP6_PARAM_PROB:
622 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
623 switch (code) {
624 case ICMP6_PARAMPROB_NEXTHEADER:
625 code = PRC_UNREACH_PROTOCOL;
626 break;
627 case ICMP6_PARAMPROB_HEADER:
628 case ICMP6_PARAMPROB_OPTION:
629 code = PRC_PARAMPROB;
630 break;
631 default:
632 goto badcode;
633 }
634 goto deliver;
635
636 case ICMP6_ECHO_REQUEST:
637 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
638 if (code != 0)
639 goto badcode;
640
641 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
642 /* Give up remote */
643 goto rate_limit_checked;
644 }
645 if ((n->m_flags & M_EXT) != 0
646 || n->m_len < off + sizeof(struct icmp6_hdr)) {
647 struct mbuf *n0 = n;
648 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
649
650 /*
651 * Prepare an internal mbuf. m_pullup() doesn't
652 * always copy the length we specified.
653 */
654 if (maxlen >= MCLBYTES) {
655 /* Give up remote */
656 m_freem(n0);
657 goto rate_limit_checked;
658 }
659 MGETHDR(n, M_DONTWAIT, n0->m_type); /* MAC-OK */
660 if (n && maxlen >= MHLEN) {
661 MCLGET(n, M_DONTWAIT);
662 if ((n->m_flags & M_EXT) == 0) {
663 m_free(n);
664 n = NULL;
665 }
666 }
667 if (n == NULL) {
668 /* Give up remote */
669 m_freem(n0);
670 goto rate_limit_checked;
671 }
672 M_COPY_PKTHDR(n, n0);
673 /*
674 * Copy IPv6 and ICMPv6 only.
675 */
676 nip6 = mtod(n, struct ip6_hdr *);
677 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
678 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
679 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
680 noff = sizeof(struct ip6_hdr);
681 n->m_pkthdr.len = n->m_len =
682 noff + sizeof(struct icmp6_hdr);
683 /*
684 * Adjust mbuf. ip6_plen will be adjusted in
685 * ip6_output().
686 */
687 m_adj(n0, off + sizeof(struct icmp6_hdr));
688 n->m_pkthdr.len += n0->m_pkthdr.len;
689 n->m_next = n0;
690 n0->m_flags &= ~M_PKTHDR;
691 } else {
692 nip6 = mtod(n, struct ip6_hdr *);
693 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
694 sizeof(*nicmp6));
695 noff = off;
696 }
697 if(nicmp6 == NULL)
698 panic("nicmp6 is NULL in %s, which isn't good!\n", __FUNCTION__);
699 else {
700 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
701 nicmp6->icmp6_code = 0;
702 }
703 if (n) {
704 icmp6stat.icp6s_reflect++;
705 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
706 icmp6_reflect(n, noff);
707 }
708 goto rate_limit_checked;
709
710 case ICMP6_ECHO_REPLY:
711 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
712 if (code != 0)
713 goto badcode;
714 break;
715
716 case MLD_LISTENER_QUERY:
717 case MLD_LISTENER_REPORT:
718
719 if (icmp6len < sizeof(struct mld_hdr))
720 goto badlen;
721 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
722 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
723 else
724 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
725
726 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
727 /* give up local */
728 if (mld_input(m, off, icmp6len) == IPPROTO_DONE)
729 m = NULL;
730 goto freeit;
731 }
732 if (mld_input(n, off, icmp6len) != IPPROTO_DONE)
733 m_freem(n);
734 /* m stays. */
735 goto rate_limit_checked;
736
737 case MLD_LISTENER_DONE:
738 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
739 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
740 goto badlen;
741 break; /* nothing to be done in kernel */
742
743 case MLD_MTRACE_RESP:
744 case MLD_MTRACE:
745 /* XXX: these two are experimental. not officially defined. */
746 /* XXX: per-interface statistics? */
747 break; /* just pass it to applications */
748
749 case ICMP6_NI_QUERY:
750 if (!icmp6_nodeinfo)
751 break;
752 //### LD 10/20 Check fbsd differences here. Not sure we're more advanced or not.
753 /* By RFC 4620 refuse to answer queries from global scope addresses */
754 if ((icmp6_nodeinfo & 8) != 8 && in6_addrscope(&ip6->ip6_src) == IPV6_ADDR_SCOPE_GLOBAL)
755 break;
756
757 if (icmp6len < sizeof(struct icmp6_nodeinfo))
758 goto badlen;
759
760 #ifndef PULLDOWN_TEST
761 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
762 return IPPROTO_DONE);
763 #endif
764
765 n = m_copy(m, 0, M_COPYALL);
766 if (n)
767 n = ni6_input(n, off);
768 if (n) {
769 noff = sizeof(struct ip6_hdr);
770 icmp6stat.icp6s_reflect++;
771 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
772 icmp6_reflect(n, noff);
773 }
774 goto rate_limit_checked;
775
776 case ICMP6_WRUREPLY:
777 if (code != 0)
778 goto badcode;
779 break;
780
781 case ND_ROUTER_SOLICIT:
782 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
783 if (code != 0)
784 goto badcode;
785 if (icmp6len < sizeof(struct nd_router_solicit))
786 goto badlen;
787
788 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
789 /* give up local */
790 nd6_rs_input(m, off, icmp6len);
791 m = NULL;
792 goto freeit;
793 }
794 nd6_rs_input(n, off, icmp6len);
795 /* m stays. */
796 goto rate_limit_checked;
797
798 case ND_ROUTER_ADVERT:
799 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
800 if (code != 0)
801 goto badcode;
802 if (icmp6len < sizeof(struct nd_router_advert))
803 goto badlen;
804
805 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
806 /* give up local */
807 nd6_ra_input(m, off, icmp6len);
808 m = NULL;
809 goto freeit;
810 }
811 nd6_ra_input(n, off, icmp6len);
812 /* m stays. */
813 goto rate_limit_checked;
814
815 case ND_NEIGHBOR_SOLICIT:
816 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
817 if (code != 0)
818 goto badcode;
819 if (icmp6len < sizeof(struct nd_neighbor_solicit))
820 goto badlen;
821
822 if (proxy ||
823 ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL)) {
824 /* give up local */
825 nd6_ns_input(m, off, icmp6len);
826 m = NULL;
827 goto freeit;
828 }
829 nd6_ns_input(n, off, icmp6len);
830 /* m stays. */
831 goto rate_limit_checked;
832
833 case ND_NEIGHBOR_ADVERT:
834 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
835 if (code != 0)
836 goto badcode;
837 if (icmp6len < sizeof(struct nd_neighbor_advert))
838 goto badlen;
839
840 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
841 /* give up local */
842 nd6_na_input(m, off, icmp6len);
843 m = NULL;
844 goto freeit;
845 }
846 nd6_na_input(n, off, icmp6len);
847 /* m stays. */
848 goto rate_limit_checked;
849
850 case ND_REDIRECT:
851 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
852 if (code != 0)
853 goto badcode;
854 if (icmp6len < sizeof(struct nd_redirect))
855 goto badlen;
856
857 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
858 /* give up local */
859 icmp6_redirect_input(m, off);
860 m = NULL;
861 goto freeit;
862 }
863 icmp6_redirect_input(n, off);
864 /* m stays. */
865 goto rate_limit_checked;
866
867 case ICMP6_ROUTER_RENUMBERING:
868 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
869 code != ICMP6_ROUTER_RENUMBERING_RESULT)
870 goto badcode;
871 if (icmp6len < sizeof(struct icmp6_router_renum))
872 goto badlen;
873 break;
874
875 default:
876 nd6log((LOG_DEBUG,
877 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
878 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
879 ip6_sprintf(&ip6->ip6_dst),
880 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
881 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
882 /* ICMPv6 error: MUST deliver it by spec... */
883 code = PRC_NCMDS;
884 /* deliver */
885 } else {
886 /* ICMPv6 informational: MUST not deliver */
887 goto rate_limit_checked;
888 }
889 deliver:
890 if (icmp6_notify_error(m, off, icmp6len, code)) {
891 /* In this case, m should've been freed. */
892 return(IPPROTO_DONE);
893 }
894 break;
895
896 badcode:
897 icmp6stat.icp6s_badcode++;
898 break;
899
900 badlen:
901 icmp6stat.icp6s_badlen++;
902 break;
903 }
904
905 rate_limit_checked:
906 icmp6_rip6_input(&m, *offp);
907 return IPPROTO_DONE;
908
909 freeit:
910 m_freem(m);
911 return IPPROTO_DONE;
912 }
913
914 static int
915 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code)
916 {
917 struct icmp6_hdr *icmp6;
918 struct ip6_hdr *eip6;
919 u_int32_t notifymtu;
920 struct sockaddr_in6 icmp6src, icmp6dst;
921
922 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
923 icmp6stat.icp6s_tooshort++;
924 goto freeit;
925 }
926 #ifndef PULLDOWN_TEST
927 IP6_EXTHDR_CHECK(m, off,
928 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
929 return -1);
930 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
931 #else
932 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
933 sizeof(*icmp6) + sizeof(struct ip6_hdr));
934 if (icmp6 == NULL) {
935 icmp6stat.icp6s_tooshort++;
936 return(-1);
937 }
938 #endif
939 eip6 = (struct ip6_hdr *)(icmp6 + 1);
940
941 /* Detect the upper level protocol */
942 {
943 void (*ctlfunc)(int, struct sockaddr *, void *, struct ifnet *);
944 u_int8_t nxt = eip6->ip6_nxt;
945 int eoff = off + sizeof(struct icmp6_hdr) +
946 sizeof(struct ip6_hdr);
947 struct ip6ctlparam ip6cp;
948 struct in6_addr *finaldst = NULL;
949 int icmp6type = icmp6->icmp6_type;
950 struct ip6_frag *fh;
951 struct ip6_rthdr *rth;
952 struct ip6_rthdr0 *rth0;
953 int rthlen;
954
955 while (1) { /* XXX: should avoid infinite loop explicitly? */
956 struct ip6_ext *eh;
957
958 switch (nxt) {
959 case IPPROTO_HOPOPTS:
960 case IPPROTO_DSTOPTS:
961 case IPPROTO_AH:
962 #ifndef PULLDOWN_TEST
963 IP6_EXTHDR_CHECK(m, 0, eoff +
964 sizeof(struct ip6_ext),
965 return -1);
966 eh = (struct ip6_ext *)(mtod(m, caddr_t)
967 + eoff);
968 #else
969 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
970 eoff, sizeof(*eh));
971 if (eh == NULL) {
972 icmp6stat.icp6s_tooshort++;
973 return(-1);
974 }
975 #endif
976
977 if (nxt == IPPROTO_AH)
978 eoff += (eh->ip6e_len + 2) << 2;
979 else
980 eoff += (eh->ip6e_len + 1) << 3;
981 nxt = eh->ip6e_nxt;
982 break;
983 case IPPROTO_ROUTING:
984 /*
985 * When the erroneous packet contains a
986 * routing header, we should examine the
987 * header to determine the final destination.
988 * Otherwise, we can't properly update
989 * information that depends on the final
990 * destination (e.g. path MTU).
991 */
992 #ifndef PULLDOWN_TEST
993 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
994 return -1);
995 rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
996 + eoff);
997 #else
998 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
999 eoff, sizeof(*rth));
1000 if (rth == NULL) {
1001 icmp6stat.icp6s_tooshort++;
1002 return(-1);
1003 }
1004 #endif
1005 rthlen = (rth->ip6r_len + 1) << 3;
1006 /*
1007 * XXX: currently there is no
1008 * officially defined type other
1009 * than type-0.
1010 * Note that if the segment left field
1011 * is 0, all intermediate hops must
1012 * have been passed.
1013 */
1014 if (rth->ip6r_segleft &&
1015 rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
1016 int hops;
1017
1018 #ifndef PULLDOWN_TEST
1019 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen,
1020 return -1);
1021 rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff);
1022 #else
1023 IP6_EXTHDR_GET(rth0,
1024 struct ip6_rthdr0 *, m,
1025 eoff, rthlen);
1026 if (rth0 == NULL) {
1027 icmp6stat.icp6s_tooshort++;
1028 return(-1);
1029 }
1030 #endif
1031 /* just ignore a bogus header */
1032 if ((rth0->ip6r0_len % 2) == 0 &&
1033 (hops = rth0->ip6r0_len/2))
1034 finaldst = (struct in6_addr *)(void *)(rth0 + 1) + (hops - 1);
1035 }
1036 eoff += rthlen;
1037 nxt = rth->ip6r_nxt;
1038 break;
1039 case IPPROTO_FRAGMENT:
1040 #ifndef PULLDOWN_TEST
1041 IP6_EXTHDR_CHECK(m, 0, eoff +
1042 sizeof(struct ip6_frag),
1043 return -1);
1044 fh = (struct ip6_frag *)(mtod(m, caddr_t)
1045 + eoff);
1046 #else
1047 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
1048 eoff, sizeof(*fh));
1049 if (fh == NULL) {
1050 icmp6stat.icp6s_tooshort++;
1051 return (-1);
1052 }
1053 #endif
1054 /*
1055 * Data after a fragment header is meaningless
1056 * unless it is the first fragment, but
1057 * we'll go to the notify label for path MTU
1058 * discovery.
1059 */
1060 if (fh->ip6f_offlg & IP6F_OFF_MASK)
1061 goto notify;
1062
1063 eoff += sizeof(struct ip6_frag);
1064 nxt = fh->ip6f_nxt;
1065 break;
1066 default:
1067 /*
1068 * This case includes ESP and the No Next
1069 * Header. In such cases going to the notify
1070 * label does not have any meaning
1071 * (i.e. ctlfunc will be NULL), but we go
1072 * anyway since we might have to update
1073 * path MTU information.
1074 */
1075 goto notify;
1076 }
1077 }
1078 notify:
1079 #ifndef PULLDOWN_TEST
1080 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1081 #else
1082 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1083 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1084 if (icmp6 == NULL) {
1085 icmp6stat.icp6s_tooshort++;
1086 return (-1);
1087 }
1088 #endif
1089
1090 /*
1091 * retrieve parameters from the inner IPv6 header, and convert
1092 * them into sockaddr structures.
1093 * XXX: there is no guarantee that the source or destination
1094 * addresses of the inner packet are in the same scope as
1095 * the addresses of the icmp packet. But there is no other
1096 * way to determine the zone.
1097 */
1098 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1099
1100 bzero(&icmp6dst, sizeof(icmp6dst));
1101 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1102 icmp6dst.sin6_family = AF_INET6;
1103 if (finaldst == NULL)
1104 icmp6dst.sin6_addr = eip6->ip6_dst;
1105 else
1106 icmp6dst.sin6_addr = *finaldst;
1107 if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
1108 goto freeit;
1109 bzero(&icmp6src, sizeof(icmp6src));
1110 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1111 icmp6src.sin6_family = AF_INET6;
1112 icmp6src.sin6_addr = eip6->ip6_src;
1113 if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
1114 goto freeit;
1115 icmp6src.sin6_flowinfo =
1116 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1117
1118 if (finaldst == NULL)
1119 finaldst = &eip6->ip6_dst;
1120 ip6cp.ip6c_m = m;
1121 ip6cp.ip6c_icmp6 = icmp6;
1122 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1123 ip6cp.ip6c_off = eoff;
1124 ip6cp.ip6c_finaldst = finaldst;
1125 ip6cp.ip6c_src = &icmp6src;
1126 ip6cp.ip6c_nxt = nxt;
1127
1128 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1129 notifymtu = ntohl(icmp6->icmp6_mtu);
1130 ip6cp.ip6c_cmdarg = (void *)&notifymtu;
1131 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1132 }
1133
1134 ctlfunc = ip6_protox[nxt]->pr_ctlinput;
1135 if (ctlfunc) {
1136 LCK_MTX_ASSERT(inet6_domain_mutex, LCK_MTX_ASSERT_OWNED);
1137
1138 lck_mtx_unlock(inet6_domain_mutex);
1139
1140 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
1141 &ip6cp, m->m_pkthdr.rcvif);
1142
1143 lck_mtx_lock(inet6_domain_mutex);
1144 }
1145 }
1146 return(0);
1147
1148 freeit:
1149 m_freem(m);
1150 return(-1);
1151 }
1152
1153 void
1154 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1155 {
1156 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1157 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1158 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1159 u_int mtu = ntohl(icmp6->icmp6_mtu);
1160 struct rtentry *rt = NULL;
1161 struct sockaddr_in6 sin6;
1162 /*
1163 * we reject ICMPv6 too big with abnormally small value.
1164 * XXX what is the good definition of "abnormally small"?
1165 */
1166 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
1167 return;
1168
1169 if (!validated)
1170 return;
1171
1172 /*
1173 * In case the suggested mtu is less than IPV6_MMTU, we
1174 * only need to remember that it was for above mentioned
1175 * "alwaysfrag" case.
1176 * Try to be as close to the spec as possible.
1177 */
1178 if (mtu < IPV6_MMTU)
1179 mtu = IPV6_MMTU - 8;
1180
1181 bzero(&sin6, sizeof(sin6));
1182 sin6.sin6_family = PF_INET6;
1183 sin6.sin6_len = sizeof(struct sockaddr_in6);
1184 sin6.sin6_addr = *dst;
1185 /* XXX normally, this won't happen */
1186 if (IN6_IS_ADDR_LINKLOCAL(dst)) {
1187 sin6.sin6_addr.s6_addr16[1] =
1188 htons(m->m_pkthdr.rcvif->if_index);
1189 }
1190 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
1191 /*
1192 * XXX On a side note, for asymmetric data-path
1193 * the lookup on receive interace is probably not
1194 * what we want to do.
1195 * That requires looking at the cached route for the
1196 * protocol control block.
1197 */
1198 rt = rtalloc1_scoped((struct sockaddr *)&sin6, 0,
1199 RTF_CLONING | RTF_PRCLONING, m->m_pkthdr.rcvif->if_index);
1200 if (rt != NULL) {
1201 RT_LOCK(rt);
1202 if ((rt->rt_flags & RTF_HOST) &&
1203 !(rt->rt_rmx.rmx_locks & RTV_MTU) &&
1204 mtu < IN6_LINKMTU(rt->rt_ifp) &&
1205 rt->rt_rmx.rmx_mtu > mtu) {
1206 icmp6stat.icp6s_pmtuchg++;
1207 rt->rt_rmx.rmx_mtu = mtu;
1208 }
1209 RT_UNLOCK(rt);
1210 rtfree(rt);
1211 }
1212 }
1213
1214 /*
1215 * Process a Node Information Query packet, based on
1216 * draft-ietf-ipngwg-icmp-name-lookups-07.
1217 *
1218 * Spec incompatibilities:
1219 * - IPv6 Subject address handling
1220 * - IPv4 Subject address handling support missing
1221 * - Proxy reply (answer even if it's not for me)
1222 * - joins NI group address at in6_ifattach() time only, does not cope
1223 * with hostname changes by sethostname(3)
1224 */
1225 #define hostnamelen strlen(hostname)
1226 static struct mbuf *
1227 ni6_input(struct mbuf *m, int off)
1228 {
1229 struct icmp6_nodeinfo *ni6, *nni6;
1230 struct mbuf *n = NULL;
1231 u_int16_t qtype;
1232 int subjlen;
1233 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1234 struct ni_reply_fqdn *fqdn;
1235 int addrs; /* for NI_QTYPE_NODEADDR */
1236 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1237 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
1238 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
1239 struct ip6_hdr *ip6;
1240 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1241 char *subj = NULL;
1242
1243 ip6 = mtod(m, struct ip6_hdr *);
1244 #ifndef PULLDOWN_TEST
1245 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1246 #else
1247 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1248 if (ni6 == NULL) {
1249 /* m is already reclaimed */
1250 return (NULL);
1251 }
1252 #endif
1253
1254 /*
1255 * Validate IPv6 source address.
1256 * The default configuration MUST be to refuse answering queries from
1257 * global-scope addresses according to RFC4602.
1258 * Notes:
1259 * - it's not very clear what "refuse" means; this implementation
1260 * simply drops it.
1261 * - it's not very easy to identify global-scope (unicast) addresses
1262 * since there are many prefixes for them. It should be safer
1263 * and in practice sufficient to check "all" but loopback and
1264 * link-local (note that site-local unicast was deprecated and
1265 * ULA is defined as global scope-wise)
1266 */
1267 if ((icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 &&
1268 !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) &&
1269 !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
1270 goto bad;
1271
1272 /*
1273 * Validate IPv6 destination address.
1274 *
1275 * The Responder must discard the Query without further processing
1276 * unless it is one of the Responder's unicast or anycast addresses, or
1277 * a link-local scope multicast address which the Responder has joined.
1278 * [RFC4602, Section 5.]
1279 */
1280 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
1281 if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1282 goto bad;
1283 /* else it's a link-local multicast, fine */
1284 } else { /* unicast or anycast */
1285 uint32_t ia6_flags;
1286
1287 if (ip6_getdstifaddr_info(m, NULL, &ia6_flags) != 0)
1288 goto bad; /* XXX impossible */
1289
1290 if ((ia6_flags & IN6_IFF_TEMPORARY) &&
1291 !(icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) {
1292 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1293 "a temporary address in %s:%d",
1294 __func__, __LINE__));
1295 goto bad;
1296 }
1297 }
1298
1299 /* validate query Subject field. */
1300 qtype = ntohs(ni6->ni_qtype);
1301 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1302 switch (qtype) {
1303 case NI_QTYPE_NOOP:
1304 case NI_QTYPE_SUPTYPES:
1305 /* 07 draft */
1306 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1307 break;
1308 /* FALLTHROUGH */
1309 case NI_QTYPE_FQDN:
1310 case NI_QTYPE_NODEADDR:
1311 case NI_QTYPE_IPV4ADDR:
1312 switch (ni6->ni_code) {
1313 case ICMP6_NI_SUBJ_IPV6:
1314 #if ICMP6_NI_SUBJ_IPV6 != 0
1315 case 0:
1316 #endif
1317 /*
1318 * backward compatibility - try to accept 03 draft
1319 * format, where no Subject is present.
1320 */
1321 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1322 subjlen == 0) {
1323 oldfqdn++;
1324 break;
1325 }
1326 #if ICMP6_NI_SUBJ_IPV6 != 0
1327 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1328 goto bad;
1329 #endif
1330
1331 if (subjlen != sizeof(struct in6_addr))
1332 goto bad;
1333
1334 /*
1335 * Validate Subject address.
1336 *
1337 * Not sure what exactly "address belongs to the node"
1338 * means in the spec, is it just unicast, or what?
1339 *
1340 * At this moment we consider Subject address as
1341 * "belong to the node" if the Subject address equals
1342 * to the IPv6 destination address; validation for
1343 * IPv6 destination address should have done enough
1344 * check for us.
1345 *
1346 * We do not do proxy at this moment.
1347 */
1348 /* m_pulldown instead of copy? */
1349 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1350 subjlen, (caddr_t)&sin6.sin6_addr);
1351 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1352 &sin6.sin6_addr);
1353 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL,
1354 NULL);
1355 bzero(&sin6_d, sizeof(sin6_d));
1356 sin6_d.sin6_family = AF_INET6; /* not used, actually */
1357 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */
1358 sin6_d.sin6_addr = ip6->ip6_dst;
1359 sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1360 &ip6->ip6_dst);
1361 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL,
1362 NULL);
1363 subj = (char *)&sin6;
1364 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
1365 break;
1366
1367 /*
1368 * XXX if we are to allow other cases, we should really
1369 * be careful about scope here.
1370 * basically, we should disallow queries toward IPv6
1371 * destination X with subject Y,
1372 * if scope(X) > scope(Y).
1373 * if we allow scope(X) > scope(Y), it will result in
1374 * information leakage across scope boundary.
1375 */
1376 goto bad;
1377
1378 case ICMP6_NI_SUBJ_FQDN:
1379 /*
1380 * Validate Subject name with gethostname(3).
1381 *
1382 * The behavior may need some debate, since:
1383 * - we are not sure if the node has FQDN as
1384 * hostname (returned by gethostname(3)).
1385 * - the code does wildcard match for truncated names.
1386 * however, we are not sure if we want to perform
1387 * wildcard match, if gethostname(3) side has
1388 * truncated hostname.
1389 */
1390 n = ni6_nametodns(hostname, hostnamelen, 0);
1391 if (!n || n->m_next || n->m_len == 0)
1392 goto bad;
1393 IP6_EXTHDR_GET(subj, char *, m,
1394 off + sizeof(struct icmp6_nodeinfo), subjlen);
1395 if (subj == NULL)
1396 goto bad;
1397 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1398 n->m_len)) {
1399 goto bad;
1400 }
1401 m_freem(n);
1402 n = NULL;
1403 break;
1404
1405 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1406 default:
1407 goto bad;
1408 }
1409 break;
1410 }
1411
1412 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1413 switch (qtype) {
1414 case NI_QTYPE_FQDN:
1415 if ((icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0)
1416 goto bad;
1417 break;
1418 case NI_QTYPE_NODEADDR:
1419 case NI_QTYPE_IPV4ADDR:
1420 if ((icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0)
1421 goto bad;
1422 break;
1423 }
1424
1425 /* guess reply length */
1426 switch (qtype) {
1427 case NI_QTYPE_NOOP:
1428 break; /* no reply data */
1429 case NI_QTYPE_SUPTYPES:
1430 replylen += sizeof(u_int32_t);
1431 break;
1432 case NI_QTYPE_FQDN:
1433 /* XXX will append an mbuf */
1434 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1435 break;
1436 case NI_QTYPE_NODEADDR:
1437 addrs = ni6_addrs(ni6, &ifp, subj);
1438 if ((replylen += addrs * (sizeof(struct in6_addr) +
1439 sizeof(u_int32_t))) > MCLBYTES)
1440 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1441 break;
1442 case NI_QTYPE_IPV4ADDR:
1443 /* unsupported - should respond with unknown Qtype? */
1444 break;
1445 default:
1446 /*
1447 * XXX: We must return a reply with the ICMP6 code
1448 * `unknown Qtype' in this case. However we regard the case
1449 * as an FQDN query for backward compatibility.
1450 * Older versions set a random value to this field,
1451 * so it rarely varies in the defined qtypes.
1452 * But the mechanism is not reliable...
1453 * maybe we should obsolete older versions.
1454 */
1455 qtype = NI_QTYPE_FQDN;
1456 /* XXX will append an mbuf */
1457 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1458 oldfqdn++;
1459 break;
1460 }
1461
1462 /* allocate an mbuf to reply. */
1463 MGETHDR(n, M_DONTWAIT, m->m_type); /* MAC-OK */
1464 if (n == NULL) {
1465 m_freem(m);
1466 if (ifp != NULL)
1467 ifnet_release(ifp);
1468 return (NULL);
1469 }
1470 M_COPY_PKTHDR(n, m); /* just for recvif */
1471 if (replylen > MHLEN) {
1472 if (replylen > MCLBYTES) {
1473 /*
1474 * XXX: should we try to allocate more? But MCLBYTES
1475 * is probably much larger than IPV6_MMTU...
1476 */
1477 goto bad;
1478 }
1479 MCLGET(n, M_DONTWAIT);
1480 if ((n->m_flags & M_EXT) == 0) {
1481 goto bad;
1482 }
1483 }
1484 n->m_pkthdr.len = n->m_len = replylen;
1485
1486 /* copy mbuf header and IPv6 + Node Information base headers */
1487 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1488 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1489 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1490
1491 /* qtype dependent procedure */
1492 switch (qtype) {
1493 case NI_QTYPE_NOOP:
1494 nni6->ni_code = ICMP6_NI_SUCCESS;
1495 nni6->ni_flags = 0;
1496 break;
1497 case NI_QTYPE_SUPTYPES:
1498 {
1499 u_int32_t v;
1500 nni6->ni_code = ICMP6_NI_SUCCESS;
1501 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1502 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1503 v = (u_int32_t)htonl(0x0000000f);
1504 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1505 break;
1506 }
1507 case NI_QTYPE_FQDN:
1508 nni6->ni_code = ICMP6_NI_SUCCESS;
1509 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1510 sizeof(struct ip6_hdr) +
1511 sizeof(struct icmp6_nodeinfo));
1512 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1513 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1514 /*
1515 * XXX do we really have FQDN in variable "hostname"?
1516 */
1517 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1518 if (n->m_next == NULL)
1519 goto bad;
1520 /* XXX we assume that n->m_next is not a chain */
1521 if (n->m_next->m_next != NULL)
1522 goto bad;
1523 n->m_pkthdr.len += n->m_next->m_len;
1524 break;
1525 case NI_QTYPE_NODEADDR:
1526 {
1527 int lenlim, copied;
1528
1529 nni6->ni_code = ICMP6_NI_SUCCESS;
1530 n->m_pkthdr.len = n->m_len =
1531 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1532 lenlim = M_TRAILINGSPACE(n);
1533 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1534 /* XXX: reset mbuf length */
1535 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1536 sizeof(struct icmp6_nodeinfo) + copied;
1537 break;
1538 }
1539 default:
1540 break; /* XXX impossible! */
1541 }
1542
1543 nni6->ni_type = ICMP6_NI_REPLY;
1544 m_freem(m);
1545 if (ifp != NULL)
1546 ifnet_release(ifp);
1547 return (n);
1548
1549 bad:
1550 m_freem(m);
1551 if (n)
1552 m_freem(n);
1553 if (ifp != NULL)
1554 ifnet_release(ifp);
1555 return (NULL);
1556 }
1557 #undef hostnamelen
1558
1559 /*
1560 * make a mbuf with DNS-encoded string. no compression support.
1561 *
1562 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1563 * treated as truncated name (two \0 at the end). this is a wild guess.
1564 */
1565 static struct mbuf *
1566 ni6_nametodns(
1567 const char *name,
1568 int namelen,
1569 int old) /* return pascal string if non-zero */
1570 {
1571 struct mbuf *m;
1572 char *cp, *ep;
1573 const char *p, *q;
1574 int i, len, nterm;
1575
1576 if (old)
1577 len = namelen + 1;
1578 else
1579 len = MCLBYTES;
1580
1581 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1582 MGET(m, M_DONTWAIT, MT_DATA);
1583 if (m && len > MLEN) {
1584 MCLGET(m, M_DONTWAIT);
1585 if ((m->m_flags & M_EXT) == 0)
1586 goto fail;
1587 }
1588 if (!m)
1589 goto fail;
1590 m->m_next = NULL;
1591
1592 if (old) {
1593 m->m_len = len;
1594 *mtod(m, char *) = namelen;
1595 bcopy(name, mtod(m, char *) + 1, namelen);
1596 return m;
1597 } else {
1598 m->m_len = 0;
1599 cp = mtod(m, char *);
1600 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1601
1602 /* if not certain about my name, return empty buffer */
1603 if (namelen == 0)
1604 return m;
1605
1606 /*
1607 * guess if it looks like shortened hostname, or FQDN.
1608 * shortened hostname needs two trailing "\0".
1609 */
1610 i = 0;
1611 for (p = name; p < name + namelen; p++) {
1612 if (*p && *p == '.')
1613 i++;
1614 }
1615 if (i < 2)
1616 nterm = 2;
1617 else
1618 nterm = 1;
1619
1620 p = name;
1621 while (cp < ep && p < name + namelen) {
1622 i = 0;
1623 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1624 i++;
1625 /* result does not fit into mbuf */
1626 if (cp + i + 1 >= ep)
1627 goto fail;
1628 /*
1629 * DNS label length restriction, RFC1035 page 8.
1630 * "i == 0" case is included here to avoid returning
1631 * 0-length label on "foo..bar".
1632 */
1633 if (i <= 0 || i >= 64)
1634 goto fail;
1635 *cp++ = i;
1636 bcopy(p, cp, i);
1637 cp += i;
1638 p = q;
1639 if (p < name + namelen && *p == '.')
1640 p++;
1641 }
1642 /* termination */
1643 if (cp + nterm >= ep)
1644 goto fail;
1645 while (nterm-- > 0)
1646 *cp++ = '\0';
1647 m->m_len = cp - mtod(m, char *);
1648 return m;
1649 }
1650
1651 panic("should not reach here");
1652 /* NOTREACHED */
1653
1654 fail:
1655 if (m)
1656 m_freem(m);
1657 return NULL;
1658 }
1659
1660 /*
1661 * check if two DNS-encoded string matches. takes care of truncated
1662 * form (with \0\0 at the end). no compression support.
1663 * XXX upper/lowercase match (see RFC2065)
1664 */
1665 static int
1666 ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1667 {
1668 const char *a0, *b0;
1669 int l;
1670
1671 /* simplest case - need validation? */
1672 if (alen == blen && bcmp(a, b, alen) == 0)
1673 return 1;
1674
1675 a0 = a;
1676 b0 = b;
1677
1678 /* termination is mandatory */
1679 if (alen < 2 || blen < 2)
1680 return 0;
1681 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1682 return 0;
1683 alen--;
1684 blen--;
1685
1686 while (a - a0 < alen && b - b0 < blen) {
1687 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1688 return 0;
1689
1690 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1691 return 0;
1692 /* we don't support compression yet */
1693 if (a[0] >= 64 || b[0] >= 64)
1694 return 0;
1695
1696 /* truncated case */
1697 if (a[0] == 0 && a - a0 == alen - 1)
1698 return 1;
1699 if (b[0] == 0 && b - b0 == blen - 1)
1700 return 1;
1701 if (a[0] == 0 || b[0] == 0)
1702 return 0;
1703
1704 if (a[0] != b[0])
1705 return 0;
1706 l = a[0];
1707 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1708 return 0;
1709 if (bcmp(a + 1, b + 1, l) != 0)
1710 return 0;
1711
1712 a += 1 + l;
1713 b += 1 + l;
1714 }
1715
1716 if (a - a0 == alen && b - b0 == blen)
1717 return 1;
1718 else
1719 return 0;
1720 }
1721
1722 /*
1723 * calculate the number of addresses to be returned in the node info reply.
1724 */
1725 static int
1726 ni6_addrs(struct icmp6_nodeinfo *ni6, struct ifnet **ifpp, char *subj)
1727 {
1728 struct ifnet *ifp;
1729 struct in6_ifaddr *ifa6;
1730 struct ifaddr *ifa;
1731 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
1732 int addrs = 0, addrsofif, iffound = 0;
1733 int niflags = ni6->ni_flags;
1734
1735 if (ifpp != NULL)
1736 *ifpp = NULL;
1737
1738 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1739 switch (ni6->ni_code) {
1740 case ICMP6_NI_SUBJ_IPV6:
1741 if (subj == NULL) /* must be impossible... */
1742 return(0);
1743 subj_ip6 = (struct sockaddr_in6 *)(void *)subj;
1744 break;
1745 default:
1746 /*
1747 * XXX: we only support IPv6 subject address for
1748 * this Qtype.
1749 */
1750 return (0);
1751 }
1752 }
1753
1754 ifnet_head_lock_shared();
1755 TAILQ_FOREACH(ifp, &ifnet_head, if_list) {
1756 addrsofif = 0;
1757 ifnet_lock_shared(ifp);
1758 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1759 {
1760 IFA_LOCK(ifa);
1761 if (ifa->ifa_addr->sa_family != AF_INET6) {
1762 IFA_UNLOCK(ifa);
1763 continue;
1764 }
1765 ifa6 = (struct in6_ifaddr *)ifa;
1766
1767 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1768 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
1769 &ifa6->ia_addr.sin6_addr))
1770 iffound = 1;
1771
1772 /*
1773 * IPv4-mapped addresses can only be returned by a
1774 * Node Information proxy, since they represent
1775 * addresses of IPv4-only nodes, which perforce do
1776 * not implement this protocol.
1777 * [icmp-name-lookups-07, Section 5.4]
1778 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1779 * this function at this moment.
1780 */
1781
1782 /* What do we have to do about ::1? */
1783 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1784 case IPV6_ADDR_SCOPE_LINKLOCAL:
1785 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) {
1786 IFA_UNLOCK(ifa);
1787 continue;
1788 }
1789 break;
1790 case IPV6_ADDR_SCOPE_SITELOCAL:
1791 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) {
1792 IFA_UNLOCK(ifa);
1793 continue;
1794 }
1795 break;
1796 case IPV6_ADDR_SCOPE_GLOBAL:
1797 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) {
1798 IFA_UNLOCK(ifa);
1799 continue;
1800 }
1801 break;
1802 default:
1803 IFA_UNLOCK(ifa);
1804 continue;
1805 }
1806
1807 /*
1808 * check if anycast is okay.
1809 * XXX: just experimental. not in the spec.
1810 */
1811 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1812 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) {
1813 IFA_UNLOCK(ifa);
1814 continue; /* we need only unicast addresses */
1815 }
1816 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1817 (icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
1818 IFA_UNLOCK(ifa);
1819 continue;
1820 }
1821 addrsofif++; /* count the address */
1822 IFA_UNLOCK(ifa);
1823 }
1824 ifnet_lock_done(ifp);
1825 if (iffound) {
1826 if (ifpp != NULL) {
1827 *ifpp = ifp;
1828 ifnet_reference(ifp);
1829 }
1830 ifnet_head_done();
1831 return(addrsofif);
1832 }
1833
1834 addrs += addrsofif;
1835 }
1836 ifnet_head_done();
1837
1838 return (addrs);
1839 }
1840
1841 static int
1842 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
1843 struct ifnet *ifp0, 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(struct mbuf **mp, int off)
2012 {
2013 struct mbuf *m = *mp;
2014 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2015 struct in6pcb *in6p;
2016 struct in6pcb *last = NULL;
2017 struct sockaddr_in6 rip6src;
2018 struct icmp6_hdr *icmp6;
2019 struct mbuf *opts = NULL;
2020 int ret = 0;
2021 struct ifnet *ifp = m->m_pkthdr.rcvif;
2022
2023 #ifndef PULLDOWN_TEST
2024 /* this is assumed to be safe. */
2025 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
2026 #else
2027 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
2028 if (icmp6 == NULL) {
2029 /* m is already reclaimed */
2030 return IPPROTO_DONE;
2031 }
2032 #endif
2033
2034 /*
2035 * XXX: the address may have embedded scope zone ID, which should be
2036 * hidden from applications.
2037 */
2038 bzero(&rip6src, sizeof(rip6src));
2039 rip6src.sin6_family = AF_INET6;
2040 rip6src.sin6_len = sizeof(struct sockaddr_in6);
2041 rip6src.sin6_addr = ip6->ip6_src;
2042 if (sa6_recoverscope(&rip6src, TRUE))
2043 return (IPPROTO_DONE);
2044
2045 lck_rw_lock_shared(ripcbinfo.ipi_lock);
2046 LIST_FOREACH(in6p, &ripcb, inp_list)
2047 {
2048 if ((in6p->inp_vflag & INP_IPV6) == 0)
2049 continue;
2050 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
2051 continue;
2052 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
2053 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
2054 continue;
2055 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
2056 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
2057 continue;
2058 if (in6p->in6p_icmp6filt
2059 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
2060 in6p->in6p_icmp6filt))
2061 continue;
2062
2063 if (inp_restricted_recv(in6p, ifp))
2064 continue;
2065
2066 if (last) {
2067 struct mbuf *n;
2068 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
2069 if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
2070 (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
2071 (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) {
2072 ret = ip6_savecontrol(last, n, &opts);
2073 if (ret != 0) {
2074 m_freem(n);
2075 m_freem(opts);
2076 last = in6p;
2077 continue;
2078 }
2079 }
2080 /* strip intermediate headers */
2081 m_adj(n, off);
2082 so_recv_data_stat(last->in6p_socket, m, 0);
2083 if (sbappendaddr(&last->in6p_socket->so_rcv,
2084 (struct sockaddr *)&rip6src,
2085 n, opts, NULL) != 0) {
2086 sorwakeup(last->in6p_socket);
2087 }
2088 opts = NULL;
2089 }
2090 }
2091 last = in6p;
2092 }
2093 if (last) {
2094 if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
2095 (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
2096 (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) {
2097 ret = ip6_savecontrol(last, m, &opts);
2098 if (ret != 0) {
2099 goto error;
2100 }
2101 }
2102 /* strip intermediate headers */
2103 m_adj(m, off);
2104 so_recv_data_stat(last->in6p_socket, m, 0);
2105 if (sbappendaddr(&last->in6p_socket->so_rcv,
2106 (struct sockaddr *)&rip6src, m, opts, NULL) != 0) {
2107 sorwakeup(last->in6p_socket);
2108 }
2109 } else {
2110 goto error;
2111 }
2112 lck_rw_done(ripcbinfo.ipi_lock);
2113 return IPPROTO_DONE;
2114
2115 error:
2116 lck_rw_done(ripcbinfo.ipi_lock);
2117 m_freem(m);
2118 m_freem(opts);
2119 ip6stat.ip6s_delivered--;
2120 return IPPROTO_DONE;
2121 }
2122
2123 /*
2124 * Reflect the ip6 packet back to the source.
2125 * OFF points to the icmp6 header, counted from the top of the mbuf.
2126 */
2127 void
2128 icmp6_reflect(struct mbuf *m, size_t off)
2129 {
2130 struct mbuf *m_ip6hdr = m;
2131 struct ip6_hdr *ip6;
2132 struct icmp6_hdr *icmp6;
2133 struct in6_ifaddr *ia;
2134 struct in6_addr t, src_storage, *src = 0;
2135 int plen;
2136 int type, code;
2137 struct ifnet *outif = NULL;
2138 struct sockaddr_in6 sa6_src, sa6_dst;
2139 struct nd_ifinfo *ndi = NULL;
2140 u_int32_t oflow;
2141 struct ip6_out_args ip6oa;
2142
2143 bzero(&ip6oa, sizeof(ip6oa));
2144 ip6oa.ip6oa_boundif = IFSCOPE_NONE;
2145 ip6oa.ip6oa_flags = IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR |
2146 IP6OAF_INTCOPROC_ALLOWED | IP6OAF_AWDL_UNRESTRICTED;
2147 ip6oa.ip6oa_sotc = SO_TC_UNSPEC;
2148 ip6oa.ip6oa_netsvctype = _NET_SERVICE_TYPE_UNSPEC;
2149
2150 if (!(m->m_pkthdr.pkt_flags & PKTF_LOOP) && m->m_pkthdr.rcvif != NULL) {
2151 ip6oa.ip6oa_boundif = m->m_pkthdr.rcvif->if_index;
2152 ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
2153 }
2154
2155 /* too short to reflect */
2156 if (off < sizeof(struct ip6_hdr)) {
2157 nd6log((LOG_DEBUG,
2158 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2159 (u_int32_t)off, (u_int32_t)sizeof(struct ip6_hdr),
2160 __func__, __LINE__));
2161 goto bad;
2162 }
2163
2164 /*
2165 * If there are extra headers between IPv6 and ICMPv6, strip
2166 * off that header first.
2167 */
2168 if (off > sizeof(struct ip6_hdr)) {
2169 size_t l;
2170 struct ip6_hdr nip6;
2171
2172 l = off - sizeof(struct ip6_hdr);
2173 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2174 m_adj(m, l);
2175 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2176 if (m->m_len < l) {
2177 if ((m_ip6hdr = m_pulldown(m, 0, l, NULL)) == NULL)
2178 return;
2179 }
2180 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2181 } else /* off == sizeof(struct ip6_hdr) */ {
2182 size_t l;
2183 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2184 if (m->m_len < l) {
2185 if ((m_ip6hdr = m_pulldown(m, 0, l, NULL)) == NULL)
2186 return;
2187 }
2188 }
2189 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
2190 ip6 = mtod(m_ip6hdr, struct ip6_hdr *);
2191 ip6->ip6_nxt = IPPROTO_ICMPV6;
2192 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
2193 type = icmp6->icmp6_type; /* keep type for statistics */
2194 code = icmp6->icmp6_code; /* ditto. */
2195
2196 t = ip6->ip6_dst;
2197 /*
2198 * ip6_input() drops a packet if its src is multicast.
2199 * So, the src is never multicast.
2200 */
2201 ip6->ip6_dst = ip6->ip6_src;
2202
2203 /*
2204 * XXX: make sure to embed scope zone information, using
2205 * already embedded IDs or the received interface (if any).
2206 * Note that rcvif may be NULL.
2207 */
2208 bzero(&sa6_src, sizeof(sa6_src));
2209 sa6_src.sin6_family = AF_INET6;
2210 sa6_src.sin6_len = sizeof(sa6_src);
2211 sa6_src.sin6_addr = ip6->ip6_dst;
2212 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
2213 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL, NULL);
2214 bzero(&sa6_dst, sizeof(sa6_dst));
2215 sa6_dst.sin6_family = AF_INET6;
2216 sa6_dst.sin6_len = sizeof(sa6_dst);
2217 sa6_dst.sin6_addr = t;
2218 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
2219 in6_embedscope(&t, &sa6_dst, NULL, NULL, NULL);
2220
2221 /*
2222 * If the incoming packet was addressed directly to us(i.e. unicast),
2223 * use dst as the src for the reply.
2224 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
2225 * (for example) when we encounter an error while forwarding procedure
2226 * destined to a duplicated address of ours.
2227 * Note that ip6_getdstifaddr() may fail if we are in an error handling
2228 * procedure of an outgoing packet of our own, in which case we need
2229 * to search in the ifaddr list.
2230 */
2231 lck_rw_lock_shared(&in6_ifaddr_rwlock);
2232 for (ia = in6_ifaddrs; ia; ia = ia->ia_next) {
2233 IFA_LOCK(&ia->ia_ifa);
2234 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
2235 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2236 IFA_UNLOCK(&ia->ia_ifa);
2237 src = &t;
2238 break;
2239 }
2240 IFA_UNLOCK(&ia->ia_ifa);
2241 }
2242 lck_rw_done(&in6_ifaddr_rwlock);
2243 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) &&
2244 ((m->m_flags & M_LOOP) || (m->m_pkthdr.pkt_flags & PKTF_LOOP))) {
2245 /*
2246 * This is the case if the dst is our link-local address
2247 * and the sender is also ourselves. Here we test for both
2248 * M_LOOP and PKTF_LOOP, since the former may have been set
2249 * in ip6_output() and that we get here as part of callling
2250 * ip6_process_hopopts(). See comments in <sys/mbuf.h>
2251 */
2252 src = &t;
2253 }
2254
2255 if (src == NULL) {
2256 int e;
2257 struct sockaddr_in6 sin6;
2258 struct route_in6 ro;
2259
2260 /*
2261 * This case matches to multicasts, our anycast, or unicasts
2262 * that we do not own. Select a source address based on the
2263 * source address of the erroneous packet.
2264 */
2265 bzero(&sin6, sizeof(sin6));
2266 sin6.sin6_family = AF_INET6;
2267 sin6.sin6_len = sizeof(sin6);
2268 sin6.sin6_addr = ip6->ip6_dst; /* zone ID should be embedded */
2269
2270 bzero(&ro, sizeof(ro));
2271 /*
2272 * in6_selectsrc() might return outif with its reference held
2273 * even in the error case, so we always need to release it
2274 * if non-NULL.
2275 */
2276 src = in6_selectsrc(&sin6, NULL, NULL, &ro, &outif,
2277 &src_storage, ip6oa.ip6oa_boundif, &e);
2278 ROUTE_RELEASE(&ro);
2279 if (src == NULL) {
2280 nd6log((LOG_DEBUG,
2281 "icmp6_reflect: source can't be determined: "
2282 "dst=%s, error=%d\n",
2283 ip6_sprintf(&sa6_src.sin6_addr), e));
2284 goto bad;
2285 }
2286 }
2287 oflow = ip6->ip6_flow; /* Save for later */
2288 ip6->ip6_src = *src;
2289 ip6->ip6_flow = 0;
2290 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2291 ip6->ip6_vfc |= IPV6_VERSION;
2292 if (icmp6->icmp6_type == ICMP6_ECHO_REPLY && icmp6->icmp6_code == 0) {
2293 ip6->ip6_flow |= (oflow & htonl(0x0ff00000));
2294 }
2295 ip6->ip6_nxt = IPPROTO_ICMPV6;
2296 if (outif != NULL && (ndi = ND_IFINFO(outif)) != NULL &&
2297 ndi->initialized) {
2298 lck_mtx_lock(&ndi->lock);
2299 ip6->ip6_hlim = ndi->chlim;
2300 lck_mtx_unlock(&ndi->lock);
2301 }
2302 if (m->m_pkthdr.rcvif != NULL &&
2303 (ndi = ND_IFINFO(m->m_pkthdr.rcvif)) != NULL &&
2304 ndi->initialized) {
2305 /* XXX: This may not be the outgoing interface */
2306 lck_mtx_lock(&ndi->lock);
2307 ip6->ip6_hlim = ndi->chlim;
2308 lck_mtx_unlock(&ndi->lock);
2309 } else {
2310 ip6->ip6_hlim = ip6_defhlim;
2311 }
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 m->m_flags &= ~(M_BCAST|M_MCAST);
2321
2322 if (outif != NULL) {
2323 ifnet_release(outif);
2324 outif = NULL;
2325 }
2326
2327 m->m_pkthdr.csum_data = 0;
2328 m->m_pkthdr.csum_flags = 0;
2329 ip6_output(m, NULL, NULL, IPV6_OUTARGS, NULL, &outif, &ip6oa);
2330 if (outif != NULL) {
2331 icmp6_ifoutstat_inc(outif, type, code);
2332 ifnet_release(outif);
2333 }
2334 return;
2335
2336 bad:
2337 m_freem(m);
2338 if (outif != NULL)
2339 ifnet_release(outif);
2340 return;
2341 }
2342
2343 static const char *
2344 icmp6_redirect_diag(struct in6_addr *src6,
2345 struct in6_addr *dst6,
2346 struct in6_addr *tgt6)
2347 {
2348 static char buf[1024];
2349 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2350 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
2351 return buf;
2352 }
2353
2354 void
2355 icmp6_redirect_input(struct mbuf *m, int off)
2356 {
2357 struct ifnet *ifp = m->m_pkthdr.rcvif;
2358 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2359 struct nd_redirect *nd_rd;
2360 int icmp6len = ntohs(ip6->ip6_plen);
2361 char *lladdr = NULL;
2362 int lladdrlen = 0;
2363 u_char *redirhdr = NULL;
2364 int redirhdrlen = 0;
2365 struct rtentry *rt = NULL;
2366 int is_router;
2367 int is_onlink;
2368 struct in6_addr src6 = ip6->ip6_src;
2369 struct in6_addr redtgt6;
2370 struct in6_addr reddst6;
2371 union nd_opts ndopts;
2372
2373 if (!m || !ifp)
2374 return;
2375
2376 /*
2377 * If we are an advertising router on this interface,
2378 * don't update route by icmp6 redirect.
2379 */
2380 if (ifp->if_eflags & IFEF_IPV6_ROUTER)
2381 goto freeit;
2382 if (!icmp6_rediraccept)
2383 goto freeit;
2384
2385 #ifndef PULLDOWN_TEST
2386 IP6_EXTHDR_CHECK(m, off, icmp6len, return);
2387 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2388 #else
2389 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2390 if (nd_rd == NULL) {
2391 icmp6stat.icp6s_tooshort++;
2392 return;
2393 }
2394 #endif
2395 redtgt6 = nd_rd->nd_rd_target;
2396 reddst6 = nd_rd->nd_rd_dst;
2397
2398 if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) ||
2399 in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) {
2400 goto freeit;
2401 }
2402
2403 /* validation */
2404 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2405 nd6log((LOG_ERR,
2406 "ICMP6 redirect sent from %s rejected; "
2407 "must be from linklocal\n", ip6_sprintf(&src6)));
2408 goto bad;
2409 }
2410 if (ip6->ip6_hlim != 255) {
2411 nd6log((LOG_ERR,
2412 "ICMP6 redirect sent from %s rejected; "
2413 "hlim=%d (must be 255)\n",
2414 ip6_sprintf(&src6), ip6->ip6_hlim));
2415 goto bad;
2416 }
2417 {
2418 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2419 struct sockaddr_in6 sin6;
2420 struct in6_addr *gw6;
2421
2422 bzero(&sin6, sizeof(sin6));
2423 sin6.sin6_family = AF_INET6;
2424 sin6.sin6_len = sizeof(struct sockaddr_in6);
2425 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
2426 rt = rtalloc1_scoped((struct sockaddr *)&sin6, 0, 0, ifp->if_index);
2427 if (rt) {
2428 RT_LOCK(rt);
2429 if (rt->rt_gateway == NULL ||
2430 rt->rt_gateway->sa_family != AF_INET6) {
2431 nd6log((LOG_ERR,
2432 "ICMP6 redirect rejected; no route "
2433 "with inet6 gateway found for redirect dst: %s\n",
2434 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2435 RT_UNLOCK(rt);
2436 rtfree(rt);
2437 goto bad;
2438 }
2439
2440 gw6 = &(((struct sockaddr_in6 *)(void *)
2441 rt->rt_gateway)->sin6_addr);
2442 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2443 nd6log((LOG_ERR,
2444 "ICMP6 redirect rejected; "
2445 "not equal to gw-for-src=%s (must be same): "
2446 "%s\n",
2447 ip6_sprintf(gw6),
2448 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2449 RT_UNLOCK(rt);
2450 rtfree(rt);
2451 goto bad;
2452 }
2453 } else {
2454 nd6log((LOG_ERR,
2455 "ICMP6 redirect rejected; "
2456 "no route found for redirect dst: %s\n",
2457 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2458 goto bad;
2459 }
2460 RT_UNLOCK(rt);
2461 rtfree(rt);
2462 rt = NULL;
2463 }
2464 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2465 nd6log((LOG_ERR,
2466 "ICMP6 redirect rejected; "
2467 "redirect dst must be unicast: %s\n",
2468 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2469 goto bad;
2470 }
2471
2472 is_router = is_onlink = 0;
2473 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2474 is_router = 1; /* router case */
2475 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2476 is_onlink = 1; /* on-link destination case */
2477 if (!is_router && !is_onlink) {
2478 nd6log((LOG_ERR,
2479 "ICMP6 redirect rejected; "
2480 "neither router case nor onlink case: %s\n",
2481 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2482 goto bad;
2483 }
2484 /* validation passed */
2485
2486 icmp6len -= sizeof(*nd_rd);
2487 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2488 if (nd6_options(&ndopts) < 0) {
2489 nd6log((LOG_INFO, "icmp6_redirect_input: "
2490 "invalid ND option, rejected: %s\n",
2491 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2492 /* nd6_options have incremented stats */
2493 goto freeit;
2494 }
2495
2496 if (ndopts.nd_opts_tgt_lladdr) {
2497 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2498 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2499 }
2500
2501 if (ndopts.nd_opts_rh) {
2502 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2503 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2504 }
2505
2506 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2507 nd6log((LOG_INFO,
2508 "icmp6_redirect_input: lladdrlen mismatch for %s "
2509 "(if %d, icmp6 packet %d): %s\n",
2510 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
2511 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2512 goto bad;
2513 }
2514
2515 /* RFC 2461 8.3 */
2516 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2517 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2518
2519 if (!is_onlink) { /* better router case. perform rtredirect. */
2520 /* perform rtredirect */
2521 struct sockaddr_in6 sdst;
2522 struct sockaddr_in6 sgw;
2523 struct sockaddr_in6 ssrc;
2524
2525 bzero(&sdst, sizeof(sdst));
2526 bzero(&sgw, sizeof(sgw));
2527 bzero(&ssrc, sizeof(ssrc));
2528 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2529 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2530 sizeof(struct sockaddr_in6);
2531 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2532 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2533 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2534 rtredirect(ifp, (struct sockaddr *)&sdst,
2535 (struct sockaddr *)&sgw, NULL, RTF_GATEWAY | RTF_HOST,
2536 (struct sockaddr *)&ssrc, NULL);
2537 }
2538 /* finally update cached route in each socket via pfctlinput */
2539 {
2540 struct sockaddr_in6 sdst;
2541
2542 bzero(&sdst, sizeof(sdst));
2543 sdst.sin6_family = AF_INET6;
2544 sdst.sin6_len = sizeof(struct sockaddr_in6);
2545 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2546
2547 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2548 #if IPSEC
2549 key_sa_routechange((struct sockaddr *)&sdst);
2550 #endif
2551 }
2552
2553 freeit:
2554 m_freem(m);
2555 return;
2556
2557 bad:
2558 icmp6stat.icp6s_badredirect++;
2559 m_freem(m);
2560 }
2561
2562 void
2563 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
2564 {
2565 struct ifnet *ifp; /* my outgoing interface */
2566 struct in6_addr ifp_ll6;
2567 struct in6_addr *router_ll6;
2568 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2569 struct mbuf *m = NULL; /* newly allocated one */
2570 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2571 struct nd_redirect *nd_rd;
2572 size_t maxlen;
2573 u_char *p;
2574 struct ifnet *outif = NULL;
2575 struct sockaddr_in6 src_sa;
2576 struct ip6_out_args ip6oa;
2577
2578 bzero(&ip6oa, sizeof(ip6oa));
2579 ip6oa.ip6oa_boundif = IFSCOPE_NONE;
2580 ip6oa.ip6oa_flags = IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR;
2581 ip6oa.ip6oa_sotc = SO_TC_UNSPEC;
2582 ip6oa.ip6oa_netsvctype = _NET_SERVICE_TYPE_UNSPEC;
2583
2584 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2585
2586 if (rt != NULL)
2587 RT_LOCK(rt);
2588
2589 /* sanity check */
2590 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2591 goto fail;
2592
2593 /*
2594 * If we are not a router to begin with, or not an advertising
2595 * router on this interface, don't send icmp6 redirect.
2596 */
2597 if (!ip6_forwarding || !(ifp->if_eflags & IFEF_IPV6_ROUTER))
2598 goto fail;
2599
2600 /*
2601 * Address check:
2602 * the source address must identify a neighbor, and
2603 * the destination address must not be a multicast address
2604 * [RFC 2461, sec 8.2]
2605 */
2606 sip6 = mtod(m0, struct ip6_hdr *);
2607 bzero(&src_sa, sizeof(src_sa));
2608 src_sa.sin6_family = AF_INET6;
2609 src_sa.sin6_len = sizeof(src_sa);
2610 src_sa.sin6_addr = sip6->ip6_src;
2611 /* we don't currently use sin6_scope_id, but eventually use it */
2612 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src);
2613 RT_UNLOCK(rt);
2614 if (nd6_is_addr_neighbor(&src_sa, ifp, 0) == 0) {
2615 /* already unlocked */
2616 rt = NULL;
2617 goto fail;
2618 }
2619 RT_LOCK(rt);
2620 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2621 goto fail; /* what should we do here? */
2622
2623 /* rate limit */
2624 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2625 goto fail;
2626
2627 /*
2628 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2629 * we almost always ask for an mbuf cluster for simplicity.
2630 * (MHLEN < IPV6_MMTU is almost always true)
2631 */
2632 #if IPV6_MMTU >= MCLBYTES
2633 # error assumption failed about IPV6_MMTU and MCLBYTES
2634 #endif
2635 MGETHDR(m, M_DONTWAIT, MT_HEADER); /* MAC-OK */
2636 if (m && IPV6_MMTU >= MHLEN)
2637 MCLGET(m, M_DONTWAIT);
2638 if (!m)
2639 goto fail;
2640 m->m_pkthdr.rcvif = NULL;
2641 m->m_len = 0;
2642 maxlen = M_TRAILINGSPACE(m);
2643 maxlen = min(IPV6_MMTU, maxlen);
2644 /* just for safety */
2645 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2646 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2647 goto fail;
2648 }
2649
2650 {
2651 /* get ip6 linklocal address for ifp(my outgoing interface). */
2652 struct in6_ifaddr *ia;
2653 if ((ia = in6ifa_ifpforlinklocal(ifp,
2654 IN6_IFF_NOTREADY|
2655 IN6_IFF_ANYCAST)) == NULL)
2656 goto fail;
2657 IFA_LOCK(&ia->ia_ifa);
2658 ifp_ll6 = ia->ia_addr.sin6_addr;
2659 IFA_UNLOCK(&ia->ia_ifa);
2660 IFA_REMREF(&ia->ia_ifa);
2661 }
2662
2663 /* get ip6 linklocal address for the router. */
2664 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2665 struct sockaddr_in6 *sin6;
2666 sin6 = (struct sockaddr_in6 *)(void *)rt->rt_gateway;
2667 router_ll6 = &sin6->sin6_addr;
2668 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2669 router_ll6 = (struct in6_addr *)NULL;
2670 } else
2671 router_ll6 = (struct in6_addr *)NULL;
2672
2673 /* ip6 */
2674 ip6 = mtod(m, struct ip6_hdr *);
2675 ip6->ip6_flow = 0;
2676 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2677 ip6->ip6_vfc |= IPV6_VERSION;
2678 /* ip6->ip6_plen will be set later */
2679 ip6->ip6_nxt = IPPROTO_ICMPV6;
2680 ip6->ip6_hlim = 255;
2681 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2682 bcopy(&ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2683 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2684
2685 /* ND Redirect */
2686 nd_rd = (struct nd_redirect *)(ip6 + 1);
2687 nd_rd->nd_rd_type = ND_REDIRECT;
2688 nd_rd->nd_rd_code = 0;
2689 nd_rd->nd_rd_reserved = 0;
2690 if (rt->rt_flags & RTF_GATEWAY) {
2691 /*
2692 * nd_rd->nd_rd_target must be a link-local address in
2693 * better router cases.
2694 */
2695 if (!router_ll6)
2696 goto fail;
2697 bcopy(router_ll6, &nd_rd->nd_rd_target,
2698 sizeof(nd_rd->nd_rd_target));
2699 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2700 sizeof(nd_rd->nd_rd_dst));
2701 } else {
2702 /* make sure redtgt == reddst */
2703 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2704 sizeof(nd_rd->nd_rd_target));
2705 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2706 sizeof(nd_rd->nd_rd_dst));
2707 }
2708 RT_UNLOCK(rt);
2709 rt = NULL;
2710
2711 p = (u_char *)(nd_rd + 1);
2712
2713 if (!router_ll6)
2714 goto nolladdropt;
2715
2716 {
2717 /* target lladdr option */
2718 struct rtentry *rt_router = NULL;
2719 int len;
2720 struct sockaddr_dl *sdl;
2721 struct nd_opt_hdr *nd_opt;
2722 char *lladdr;
2723
2724 /* Callee returns a locked route upon success */
2725 rt_router = nd6_lookup(router_ll6, 0, ifp, 0);
2726 if (!rt_router)
2727 goto nolladdropt;
2728 RT_LOCK_ASSERT_HELD(rt_router);
2729 len = sizeof(*nd_opt) + ifp->if_addrlen;
2730 len = (len + 7) & ~7; /* round by 8 */
2731 /* safety check */
2732 if (len + (p - (u_char *)ip6) > maxlen) {
2733 RT_REMREF_LOCKED(rt_router);
2734 RT_UNLOCK(rt_router);
2735 goto nolladdropt;
2736 }
2737
2738 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2739 (rt_router->rt_flags & RTF_LLINFO) &&
2740 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2741 (sdl = (struct sockaddr_dl *)(void *)
2742 rt_router->rt_gateway) && sdl->sdl_alen) {
2743 nd_opt = (struct nd_opt_hdr *)p;
2744 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2745 nd_opt->nd_opt_len = len >> 3;
2746 lladdr = (char *)(nd_opt + 1);
2747 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2748 p += len;
2749 }
2750 RT_REMREF_LOCKED(rt_router);
2751 RT_UNLOCK(rt_router);
2752 }
2753
2754 nolladdropt:;
2755
2756 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2757
2758 /* just to be safe */
2759 #ifdef M_DECRYPTED /*not openbsd*/
2760 if (m0->m_flags & M_DECRYPTED)
2761 goto noredhdropt;
2762 #endif
2763 if (p - (u_char *)ip6 > maxlen)
2764 goto noredhdropt;
2765
2766 {
2767 /* redirected header option */
2768 int len;
2769 struct nd_opt_rd_hdr *nd_opt_rh;
2770
2771 /*
2772 * compute the maximum size for icmp6 redirect header option.
2773 * XXX room for auth header?
2774 */
2775 len = maxlen - (p - (u_char *)ip6);
2776 len &= ~7;
2777
2778 /* This is just for simplicity. */
2779 if (m0->m_pkthdr.len != m0->m_len) {
2780 if (m0->m_next) {
2781 m_freem(m0->m_next);
2782 m0->m_next = NULL;
2783 }
2784 m0->m_pkthdr.len = m0->m_len;
2785 }
2786
2787 /*
2788 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2789 * about padding/truncate rule for the original IP packet.
2790 * From the discussion on IPv6imp in Feb 1999, the consensus was:
2791 * - "attach as much as possible" is the goal
2792 * - pad if not aligned (original size can be guessed by original
2793 * ip6 header)
2794 * Following code adds the padding if it is simple enough,
2795 * and truncates if not.
2796 */
2797 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2798 panic("assumption failed in %s:%d\n", __func__, __LINE__);
2799
2800 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2801 /* not enough room, truncate */
2802 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2803 } else {
2804 /* enough room, pad or truncate */
2805 size_t extra;
2806
2807 extra = m0->m_pkthdr.len % 8;
2808 if (extra) {
2809 /* pad if easy enough, truncate if not */
2810 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2811 /* pad */
2812 m0->m_len += (8 - extra);
2813 m0->m_pkthdr.len += (8 - extra);
2814 } else {
2815 /* truncate */
2816 m0->m_pkthdr.len -= extra;
2817 m0->m_len -= extra;
2818 }
2819 }
2820 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2821 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2822 }
2823
2824 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2825 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2826 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2827 nd_opt_rh->nd_opt_rh_len = len >> 3;
2828 p += sizeof(*nd_opt_rh);
2829 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2830
2831 /* connect m0 to m */
2832 m->m_next = m0;
2833 m->m_pkthdr.len = m->m_len + m0->m_len;
2834 }
2835 noredhdropt:;
2836
2837 /* XXX: clear embedded link IDs in the inner header */
2838 in6_clearscope(&sip6->ip6_src);
2839 in6_clearscope(&sip6->ip6_dst);
2840 in6_clearscope(&nd_rd->nd_rd_target);
2841 in6_clearscope(&nd_rd->nd_rd_dst);
2842
2843 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2844
2845 nd_rd->nd_rd_cksum = 0;
2846 nd_rd->nd_rd_cksum
2847 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2848
2849 /* send the packet to outside... */
2850 ip6oa.ip6oa_boundif = ifp->if_index;
2851 ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
2852
2853 ip6_output(m, NULL, NULL, IPV6_OUTARGS, NULL, &outif, &ip6oa);
2854 if (outif) {
2855 icmp6_ifstat_inc(outif, ifs6_out_msg);
2856 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2857 ifnet_release(outif);
2858 }
2859 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2860
2861 return;
2862
2863 fail:
2864 if (rt != NULL)
2865 RT_UNLOCK(rt);
2866 if (m)
2867 m_freem(m);
2868 if (m0)
2869 m_freem(m0);
2870 }
2871
2872 /*
2873 * ICMPv6 socket option processing.
2874 */
2875 int
2876 icmp6_ctloutput(struct socket *so, struct sockopt *sopt)
2877 {
2878 int error = 0;
2879 int optlen;
2880 struct inpcb *inp = sotoinpcb(so);
2881 int level, op, optname;
2882
2883 if (sopt) {
2884 level = sopt->sopt_level;
2885 op = sopt->sopt_dir;
2886 optname = sopt->sopt_name;
2887 optlen = sopt->sopt_valsize;
2888 } else
2889 level = op = optname = optlen = 0;
2890
2891 if (level != IPPROTO_ICMPV6) {
2892 return EINVAL;
2893 }
2894
2895 switch (op) {
2896 case PRCO_SETOPT:
2897 switch (optname) {
2898 case ICMP6_FILTER:
2899 {
2900 struct icmp6_filter *p;
2901
2902 if (optlen != 0 && optlen != sizeof(*p)) {
2903 error = EMSGSIZE;
2904 break;
2905 }
2906 if (inp->in6p_icmp6filt == NULL) {
2907 error = EINVAL;
2908 break;
2909 }
2910
2911 if (optlen == 0) {
2912 /* According to RFC 3542, an installed filter can be
2913 * cleared by issuing a setsockopt for ICMP6_FILTER
2914 * with a zero length.
2915 */
2916 ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
2917 } else {
2918 error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen,
2919 optlen);
2920 }
2921 break;
2922 }
2923
2924 default:
2925 error = ENOPROTOOPT;
2926 break;
2927 }
2928 break;
2929
2930 case PRCO_GETOPT:
2931 switch (optname) {
2932 case ICMP6_FILTER:
2933 {
2934 if (inp->in6p_icmp6filt == NULL) {
2935 error = EINVAL;
2936 break;
2937 }
2938 error = sooptcopyout(sopt, inp->in6p_icmp6filt,
2939 min(sizeof(struct icmp6_filter), optlen));
2940 break;
2941 }
2942
2943 default:
2944 error = ENOPROTOOPT;
2945 break;
2946 }
2947 break;
2948 }
2949
2950 return(error);
2951 }
2952
2953 /*
2954 * ICMPv6 socket datagram option processing.
2955 */
2956 int
2957 icmp6_dgram_ctloutput(struct socket *so, struct sockopt *sopt)
2958 {
2959 if (kauth_cred_issuser(so->so_cred))
2960 return icmp6_ctloutput(so, sopt);
2961
2962 if (sopt->sopt_level == IPPROTO_ICMPV6) {
2963 switch (sopt->sopt_name) {
2964 case ICMP6_FILTER:
2965 return icmp6_ctloutput(so, sopt);
2966 default:
2967 return EPERM;
2968 }
2969 }
2970
2971 if (sopt->sopt_level != IPPROTO_IPV6)
2972 return EINVAL;
2973
2974 switch (sopt->sopt_name) {
2975 case IPV6_UNICAST_HOPS:
2976 case IPV6_CHECKSUM:
2977 case IPV6_V6ONLY:
2978 case IPV6_USE_MIN_MTU:
2979 case IPV6_RECVRTHDR:
2980 case IPV6_RECVPKTINFO:
2981 case IPV6_RECVHOPLIMIT:
2982 case IPV6_PATHMTU:
2983 case IPV6_PKTINFO:
2984 case IPV6_HOPLIMIT:
2985 case IPV6_HOPOPTS:
2986 case IPV6_DSTOPTS:
2987 case IPV6_MULTICAST_IF:
2988 case IPV6_MULTICAST_HOPS:
2989 case IPV6_MULTICAST_LOOP:
2990 case IPV6_JOIN_GROUP:
2991 case IPV6_LEAVE_GROUP:
2992 case IPV6_PORTRANGE:
2993 case IPV6_IPSEC_POLICY:
2994 case IPV6_RECVTCLASS:
2995 case IPV6_TCLASS:
2996 case IPV6_2292PKTOPTIONS:
2997 case IPV6_2292PKTINFO:
2998 case IPV6_2292HOPLIMIT:
2999 case IPV6_2292HOPOPTS:
3000 case IPV6_2292DSTOPTS:
3001 case IPV6_2292RTHDR:
3002 case IPV6_BOUND_IF:
3003 case IPV6_NO_IFT_CELLULAR:
3004
3005 return ip6_ctloutput(so, sopt);
3006
3007 default:
3008 return EPERM;
3009 }
3010 }
3011
3012 __private_extern__ int
3013 icmp6_dgram_send(struct socket *so, int flags, struct mbuf *m,
3014 struct sockaddr *nam, struct mbuf *control, struct proc *p)
3015 {
3016 #pragma unused(flags, p)
3017 int error = 0;
3018 struct inpcb *inp = sotoinpcb(so);
3019 struct sockaddr_in6 tmp;
3020 struct sockaddr_in6 *dst = (struct sockaddr_in6 *)(void *)nam;
3021 struct icmp6_hdr *icmp6;
3022
3023 if (inp == NULL
3024 #if NECP
3025 || (necp_socket_should_use_flow_divert(inp))
3026 #endif /* NECP */
3027 ) {
3028 error = (inp == NULL ? EINVAL : EPROTOTYPE);
3029 goto bad;
3030 }
3031
3032 if (kauth_cred_issuser(so->so_cred))
3033 return (rip6_output(m, so, SIN6(nam), control, 0));
3034
3035 /* always copy sockaddr to avoid overwrites */
3036 if (so->so_state & SS_ISCONNECTED) {
3037 if (nam != NULL) {
3038 error = EISCONN;
3039 goto bad;
3040 }
3041 /* XXX */
3042 bzero(&tmp, sizeof(tmp));
3043 tmp.sin6_family = AF_INET6;
3044 tmp.sin6_len = sizeof(struct sockaddr_in6);
3045 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
3046 sizeof(struct in6_addr));
3047 dst = &tmp;
3048 } else {
3049 if (nam == NULL) {
3050 error = ENOTCONN;
3051 goto bad;
3052 }
3053 tmp = *(struct sockaddr_in6 *)(void *)nam;
3054 dst = &tmp;
3055 }
3056
3057 /*
3058 * For an ICMPv6 packet, we should know its type and code
3059 */
3060 if (SOCK_PROTO(so) == IPPROTO_ICMPV6) {
3061 if (m->m_len < sizeof(struct icmp6_hdr) &&
3062 (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
3063 error = ENOBUFS;
3064 goto bad;
3065 }
3066 icmp6 = mtod(m, struct icmp6_hdr *);
3067
3068 /*
3069 * Allow only to send echo request and node information request
3070 * See RFC 2463 for Echo Request Message format
3071 */
3072 if ((icmp6->icmp6_type == ICMP6_ECHO_REQUEST &&
3073 icmp6->icmp6_code == 0) ||
3074 (icmp6->icmp6_type == ICMP6_NI_QUERY &&
3075 (icmp6->icmp6_code == ICMP6_NI_SUBJ_IPV6 ||
3076 icmp6->icmp6_code == ICMP6_NI_SUBJ_FQDN))) {
3077 /* Good */
3078 ;
3079 } else {
3080 error = EPERM;
3081 goto bad;
3082 }
3083 }
3084
3085 #if ENABLE_DEFAULT_SCOPE
3086 if (dst->sin6_scope_id == 0) { /* not change if specified */
3087 dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr);
3088 }
3089 #endif
3090
3091 return (rip6_output(m, so, dst, control, 0));
3092 bad:
3093 VERIFY(error != 0);
3094
3095 if (m != NULL)
3096 m_freem(m);
3097 if (control != NULL)
3098 m_freem(control);
3099
3100 return (error);
3101 }
3102
3103 /* Like rip6_attach but without root privilege enforcement */
3104 __private_extern__ int
3105 icmp6_dgram_attach(struct socket *so, int proto, struct proc *p)
3106 {
3107 struct inpcb *inp;
3108 int error;
3109
3110 inp = sotoinpcb(so);
3111 if (inp)
3112 panic("icmp6_dgram_attach");
3113
3114 if (proto != IPPROTO_ICMPV6)
3115 return EINVAL;
3116
3117 error = soreserve(so, rip_sendspace, rip_recvspace);
3118 if (error)
3119 return error;
3120 error = in_pcballoc(so, &ripcbinfo, p);
3121 if (error)
3122 return error;
3123 inp = (struct inpcb *)so->so_pcb;
3124 inp->inp_vflag |= INP_IPV6;
3125 inp->in6p_ip6_nxt = IPPROTO_ICMPV6;
3126 inp->in6p_hops = -1; /* use kernel default */
3127 inp->in6p_cksum = -1;
3128 MALLOC(inp->in6p_icmp6filt, struct icmp6_filter *,
3129 sizeof(struct icmp6_filter), M_PCB, M_WAITOK);
3130 if (inp->in6p_icmp6filt == NULL)
3131 return (ENOMEM);
3132 ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
3133 return 0;
3134 }
3135
3136
3137 /*
3138 * Perform rate limit check.
3139 * Returns 0 if it is okay to send the icmp6 packet.
3140 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
3141 * limitation.
3142 *
3143 * XXX per-destination check necessary?
3144 */
3145 static int
3146 icmp6_ratelimit(
3147 __unused const struct in6_addr *dst, /* not used at this moment */
3148 const int type,
3149 __unused const int code)
3150 {
3151 int ret;
3152
3153 ret = 0; /* okay to send */
3154
3155 /* PPS limit */
3156 if (type == ND_ROUTER_ADVERT) {
3157 if (!ppsratecheck(&icmp6rappslim_last, &icmp6rapps_count,
3158 icmp6rappslim))
3159 ret++;
3160 } else if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
3161 icmp6errppslim)) {
3162 /* The packet is subject to rate limit */
3163 ret++;
3164 }
3165
3166 return ret;
3167 }
mirror of XNU