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1 /* $FreeBSD: src/sys/netinet6/icmp6.c,v 1.6.2.6 2001/07/10 09:44:16 ume Exp $ */
2 /* $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $ */
3
4 /*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 /*
34 * Copyright (c) 1982, 1986, 1988, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 * 3. All advertising materials mentioning features or use of this software
46 * must display the following acknowledgement:
47 * This product includes software developed by the University of
48 * California, Berkeley and its contributors.
49 * 4. Neither the name of the University nor the names of its contributors
50 * may be used to endorse or promote products derived from this software
51 * without specific prior written permission.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63 * SUCH DAMAGE.
64 *
65 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
66 */
67
68
69 #include <sys/param.h>
70 #include <sys/systm.h>
71 #include <sys/lock.h>
72 #include <sys/malloc.h>
73 #include <sys/mbuf.h>
74 #include <sys/protosw.h>
75 #include <sys/socket.h>
76 #include <sys/socketvar.h>
77 #include <sys/time.h>
78 #include <sys/kernel.h>
79 #include <sys/syslog.h>
80 #include <sys/domain.h>
81
82 #include <net/if.h>
83 #include <net/route.h>
84 #include <net/if_dl.h>
85 #include <net/if_types.h>
86
87 #include <netinet/in.h>
88 #include <netinet/in_var.h>
89 #include <netinet/ip6.h>
90 #include <netinet6/ip6_var.h>
91 #include <netinet/icmp6.h>
92 #include <netinet6/mld6_var.h>
93 #include <netinet/in_pcb.h>
94 #include <netinet6/in6_pcb.h>
95 #include <netinet6/nd6.h>
96 #include <netinet6/in6_ifattach.h>
97 #include <netinet6/ip6protosw.h>
98
99 #if IPSEC
100 #include <netinet6/ipsec.h>
101 #include <netkey/key.h>
102
103 extern int ipsec_bypass;
104 #endif
105
106 #include "faith.h"
107 #if defined(NFAITH) && 0 < NFAITH
108 #include <net/if_faith.h>
109 #endif
110
111 #include <net/net_osdep.h>
112
113 extern struct domain inet6domain;
114 extern struct ip6protosw inet6sw[];
115 extern struct ip6protosw *ip6_protox[];
116
117 struct icmp6stat icmp6stat;
118
119 extern struct inpcbhead ripcb;
120 extern int icmp6errppslim;
121 static int icmp6errpps_count = 0;
122 static struct timeval icmp6errppslim_last;
123 extern int icmp6_nodeinfo;
124 extern struct inpcbinfo ripcbinfo;
125 extern lck_mtx_t *ip6_mutex;
126 extern lck_mtx_t *nd6_mutex;
127
128 static void icmp6_errcount(struct icmp6errstat *, int, int);
129 static int icmp6_rip6_input(struct mbuf **, int);
130 static int icmp6_ratelimit(const struct in6_addr *, const int, const int);
131 static const char *icmp6_redirect_diag(struct in6_addr *,
132 struct in6_addr *, struct in6_addr *);
133 #ifndef HAVE_PPSRATECHECK
134 static int ppsratecheck(struct timeval *, int *, int);
135 #endif
136 static struct mbuf *ni6_input(struct mbuf *, int);
137 static struct mbuf *ni6_nametodns(const char *, int, int);
138 static int ni6_dnsmatch(const char *, int, const char *, int);
139 static int ni6_addrs(struct icmp6_nodeinfo *,
140 struct ifnet **, char *);
141 static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
142 struct ifnet *, int);
143 static int icmp6_notify_error(struct mbuf *, int, int, int);
144
145 #ifdef COMPAT_RFC1885
146 static struct route_in6 icmp6_reflect_rt;
147 #endif
148
149
150 void
151 icmp6_init()
152 {
153 mld6_init();
154 }
155
156 static void
157 icmp6_errcount(stat, type, code)
158 struct icmp6errstat *stat;
159 int type, code;
160 {
161 switch (type) {
162 case ICMP6_DST_UNREACH:
163 switch (code) {
164 case ICMP6_DST_UNREACH_NOROUTE:
165 stat->icp6errs_dst_unreach_noroute++;
166 return;
167 case ICMP6_DST_UNREACH_ADMIN:
168 stat->icp6errs_dst_unreach_admin++;
169 return;
170 case ICMP6_DST_UNREACH_BEYONDSCOPE:
171 stat->icp6errs_dst_unreach_beyondscope++;
172 return;
173 case ICMP6_DST_UNREACH_ADDR:
174 stat->icp6errs_dst_unreach_addr++;
175 return;
176 case ICMP6_DST_UNREACH_NOPORT:
177 stat->icp6errs_dst_unreach_noport++;
178 return;
179 }
180 break;
181 case ICMP6_PACKET_TOO_BIG:
182 stat->icp6errs_packet_too_big++;
183 return;
184 case ICMP6_TIME_EXCEEDED:
185 switch (code) {
186 case ICMP6_TIME_EXCEED_TRANSIT:
187 stat->icp6errs_time_exceed_transit++;
188 return;
189 case ICMP6_TIME_EXCEED_REASSEMBLY:
190 stat->icp6errs_time_exceed_reassembly++;
191 return;
192 }
193 break;
194 case ICMP6_PARAM_PROB:
195 switch (code) {
196 case ICMP6_PARAMPROB_HEADER:
197 stat->icp6errs_paramprob_header++;
198 return;
199 case ICMP6_PARAMPROB_NEXTHEADER:
200 stat->icp6errs_paramprob_nextheader++;
201 return;
202 case ICMP6_PARAMPROB_OPTION:
203 stat->icp6errs_paramprob_option++;
204 return;
205 }
206 break;
207 case ND_REDIRECT:
208 stat->icp6errs_redirect++;
209 return;
210 }
211 stat->icp6errs_unknown++;
212 }
213
214 /*
215 * Generate an error packet of type error in response to bad IP6 packet.
216 */
217 void
218 icmp6_error(m, type, code, param)
219 struct mbuf *m;
220 int type, code, param;
221 {
222 struct ip6_hdr *oip6, *nip6;
223 struct icmp6_hdr *icmp6;
224 u_int preplen;
225 int off;
226 int nxt;
227
228 icmp6stat.icp6s_error++;
229
230 lck_mtx_assert(ip6_mutex, LCK_MTX_ASSERT_NOTOWNED);
231 /* count per-type-code statistics */
232 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
233
234 #ifdef M_DECRYPTED /*not openbsd*/
235 if (m->m_flags & M_DECRYPTED) {
236 icmp6stat.icp6s_canterror++;
237 goto freeit;
238 }
239 #endif
240
241 #ifndef PULLDOWN_TEST
242 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), return);
243 #else
244 if (m->m_len < sizeof(struct ip6_hdr)) {
245 m = m_pullup(m, sizeof(struct ip6_hdr));
246 if (m == NULL)
247 return;
248 }
249 #endif
250 oip6 = mtod(m, struct ip6_hdr *);
251
252 /*
253 * Multicast destination check. For unrecognized option errors,
254 * this check has already done in ip6_unknown_opt(), so we can
255 * check only for other errors.
256 */
257 if ((m->m_flags & (M_BCAST|M_MCAST) ||
258 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
259 (type != ICMP6_PACKET_TOO_BIG &&
260 (type != ICMP6_PARAM_PROB ||
261 code != ICMP6_PARAMPROB_OPTION)))
262 goto freeit;
263
264 /* Source address check. XXX: the case of anycast source? */
265 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
266 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
267 goto freeit;
268
269 /*
270 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
271 * don't do it.
272 */
273 nxt = -1;
274 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
275 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
276 struct icmp6_hdr *icp;
277
278 #ifndef PULLDOWN_TEST
279 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), return);
280 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
281 #else
282 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
283 sizeof(*icp));
284 if (icp == NULL) {
285 icmp6stat.icp6s_tooshort++;
286 return;
287 }
288 #endif
289 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
290 icp->icmp6_type == ND_REDIRECT) {
291 /*
292 * ICMPv6 error
293 * Special case: for redirect (which is
294 * informational) we must not send icmp6 error.
295 */
296 icmp6stat.icp6s_canterror++;
297 goto freeit;
298 } else {
299 /* ICMPv6 informational - send the error */
300 }
301 } else {
302 /* non-ICMPv6 - send the error */
303 }
304
305 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
306
307 /* Finally, do rate limitation check. */
308 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
309 icmp6stat.icp6s_toofreq++;
310 goto freeit;
311 }
312
313 /*
314 * OK, ICMP6 can be generated.
315 */
316
317 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
318 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
319
320 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
321 M_PREPEND(m, preplen, M_DONTWAIT);
322 if (m && m->m_len < preplen)
323 m = m_pullup(m, preplen);
324 if (m == NULL) {
325 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
326 return;
327 }
328
329 nip6 = mtod(m, struct ip6_hdr *);
330 nip6->ip6_src = oip6->ip6_src;
331 nip6->ip6_dst = oip6->ip6_dst;
332
333 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
334 oip6->ip6_src.s6_addr16[1] = 0;
335 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
336 oip6->ip6_dst.s6_addr16[1] = 0;
337
338 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
339 icmp6->icmp6_type = type;
340 icmp6->icmp6_code = code;
341 icmp6->icmp6_pptr = htonl((u_int32_t)param);
342
343 /*
344 * icmp6_reflect() is designed to be in the input path.
345 * icmp6_error() can be called from both input and outut path,
346 * and if we are in output path rcvif could contain bogus value.
347 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
348 * information in ip header (nip6).
349 */
350 m->m_pkthdr.rcvif = NULL;
351
352 icmp6stat.icp6s_outhist[type]++;
353 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
354
355 return;
356
357 freeit:
358 /*
359 * If we can't tell wheter or not we can generate ICMP6, free it.
360 */
361 m_freem(m);
362 }
363
364 /*
365 * Process a received ICMP6 message.
366 */
367 int
368 icmp6_input(mp, offp)
369 struct mbuf **mp;
370 int *offp;
371 {
372 struct mbuf *m = *mp, *n;
373 struct ip6_hdr *ip6, *nip6;
374 struct icmp6_hdr *icmp6, *nicmp6;
375 int off = *offp;
376 int icmp6len = m->m_pkthdr.len - *offp;
377 int code, sum, noff;
378
379 #ifndef PULLDOWN_TEST
380 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), return IPPROTO_DONE);
381 /* m might change if M_LOOP. So, call mtod after this */
382 #endif
383
384 /*
385 * Locate icmp6 structure in mbuf, and check
386 * that not corrupted and of at least minimum length
387 */
388
389 ip6 = mtod(m, struct ip6_hdr *);
390 if (icmp6len < sizeof(struct icmp6_hdr)) {
391 icmp6stat.icp6s_tooshort++;
392 goto freeit;
393 }
394
395 /*
396 * calculate the checksum
397 */
398 #ifndef PULLDOWN_TEST
399 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
400 #else
401 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
402 if (icmp6 == NULL) {
403 icmp6stat.icp6s_tooshort++;
404 return IPPROTO_DONE;
405 }
406 #endif
407 code = icmp6->icmp6_code;
408
409 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
410 nd6log((LOG_ERR,
411 "ICMP6 checksum error(%d|%x) %s\n",
412 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
413 icmp6stat.icp6s_checksum++;
414 goto freeit;
415 }
416
417 #if defined(NFAITH) && 0 < NFAITH
418 if (faithprefix(&ip6->ip6_dst)) {
419 /*
420 * Deliver very specific ICMP6 type only.
421 * This is important to deilver TOOBIG. Otherwise PMTUD
422 * will not work.
423 */
424 switch (icmp6->icmp6_type) {
425 case ICMP6_DST_UNREACH:
426 case ICMP6_PACKET_TOO_BIG:
427 case ICMP6_TIME_EXCEEDED:
428 break;
429 default:
430 goto freeit;
431 }
432 }
433 #endif
434
435 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
436 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
437 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
438 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
439
440 switch (icmp6->icmp6_type) {
441 case ICMP6_DST_UNREACH:
442 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
443 switch (code) {
444 case ICMP6_DST_UNREACH_NOROUTE:
445 code = PRC_UNREACH_NET;
446 break;
447 case ICMP6_DST_UNREACH_ADMIN:
448 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
449 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
450 break;
451 case ICMP6_DST_UNREACH_ADDR:
452 code = PRC_HOSTDEAD;
453 break;
454 #ifdef COMPAT_RFC1885
455 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
456 code = PRC_UNREACH_SRCFAIL;
457 break;
458 #else
459 case ICMP6_DST_UNREACH_BEYONDSCOPE:
460 /* I mean "source address was incorrect." */
461 code = PRC_PARAMPROB;
462 break;
463 #endif
464 case ICMP6_DST_UNREACH_NOPORT:
465 code = PRC_UNREACH_PORT;
466 break;
467 default:
468 goto badcode;
469 }
470 goto deliver;
471 break;
472
473 case ICMP6_PACKET_TOO_BIG:
474 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
475 if (code != 0)
476 goto badcode;
477
478 code = PRC_MSGSIZE;
479
480 /*
481 * Updating the path MTU will be done after examining
482 * intermediate extension headers.
483 */
484 goto deliver;
485 break;
486
487 case ICMP6_TIME_EXCEEDED:
488 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
489 switch (code) {
490 case ICMP6_TIME_EXCEED_TRANSIT:
491 case ICMP6_TIME_EXCEED_REASSEMBLY:
492 code += PRC_TIMXCEED_INTRANS;
493 break;
494 default:
495 goto badcode;
496 }
497 goto deliver;
498 break;
499
500 case ICMP6_PARAM_PROB:
501 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
502 switch (code) {
503 case ICMP6_PARAMPROB_NEXTHEADER:
504 code = PRC_UNREACH_PROTOCOL;
505 break;
506 case ICMP6_PARAMPROB_HEADER:
507 case ICMP6_PARAMPROB_OPTION:
508 code = PRC_PARAMPROB;
509 break;
510 default:
511 goto badcode;
512 }
513 goto deliver;
514 break;
515
516 case ICMP6_ECHO_REQUEST:
517 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
518 if (code != 0)
519 goto badcode;
520 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
521 /* Give up remote */
522 break;
523 }
524 if ((n->m_flags & M_EXT) != 0
525 || n->m_len < off + sizeof(struct icmp6_hdr)) {
526 struct mbuf *n0 = n;
527 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
528
529 /*
530 * Prepare an internal mbuf. m_pullup() doesn't
531 * always copy the length we specified.
532 */
533 if (maxlen >= MCLBYTES) {
534 /* Give up remote */
535 m_freem(n0);
536 break;
537 }
538 MGETHDR(n, M_DONTWAIT, n0->m_type);
539 if (n && maxlen >= MHLEN) {
540 MCLGET(n, M_DONTWAIT);
541 if ((n->m_flags & M_EXT) == 0) {
542 m_free(n);
543 n = NULL;
544 }
545 }
546 if (n == NULL) {
547 /* Give up remote */
548 m_freem(n0);
549 break;
550 }
551 M_COPY_PKTHDR(n, n0);
552 /*
553 * Copy IPv6 and ICMPv6 only.
554 */
555 nip6 = mtod(n, struct ip6_hdr *);
556 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
557 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
558 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
559 noff = sizeof(struct ip6_hdr);
560 n->m_pkthdr.len = n->m_len =
561 noff + sizeof(struct icmp6_hdr);
562 /*
563 * Adjust mbuf. ip6_plen will be adjusted in
564 * ip6_output().
565 */
566 m_adj(n0, off + sizeof(struct icmp6_hdr));
567 n->m_pkthdr.len += n0->m_pkthdr.len;
568 n->m_next = n0;
569 n0->m_flags &= ~M_PKTHDR;
570 } else {
571 nip6 = mtod(n, struct ip6_hdr *);
572 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off);
573 noff = off;
574 }
575 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
576 nicmp6->icmp6_code = 0;
577 if (n) {
578 icmp6stat.icp6s_reflect++;
579 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
580 icmp6_reflect(n, noff);
581 }
582 break;
583
584 case ICMP6_ECHO_REPLY:
585 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
586 if (code != 0)
587 goto badcode;
588 break;
589
590 case MLD6_LISTENER_QUERY:
591 case MLD6_LISTENER_REPORT:
592 if (icmp6len < sizeof(struct mld6_hdr))
593 goto badlen;
594 if (icmp6->icmp6_type == MLD6_LISTENER_QUERY) /* XXX: ugly... */
595 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
596 else
597 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
598 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
599 /* give up local */
600 mld6_input(m, off);
601 m = NULL;
602 goto freeit;
603 }
604 mld6_input(n, off);
605 /* m stays. */
606 break;
607
608 case MLD6_LISTENER_DONE:
609 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
610 if (icmp6len < sizeof(struct mld6_hdr)) /* necessary? */
611 goto badlen;
612 break; /* nothing to be done in kernel */
613
614 case MLD6_MTRACE_RESP:
615 case MLD6_MTRACE:
616 /* XXX: these two are experimental. not officially defind. */
617 /* XXX: per-interface statistics? */
618 break; /* just pass it to applications */
619
620 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
621 {
622 enum { WRU, FQDN } mode;
623
624 if (!icmp6_nodeinfo)
625 break;
626
627 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
628 mode = WRU;
629 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
630 mode = FQDN;
631 else
632 goto badlen;
633
634 #define hostnamelen strlen(hostname)
635 if (mode == FQDN) {
636 #ifndef PULLDOWN_TEST
637 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
638 return IPPROTO_DONE);
639 #endif
640 n = m_copy(m, 0, M_COPYALL);
641 if (n)
642 n = ni6_input(n, off);
643 /* XXX meaningless if n == NULL */
644 noff = sizeof(struct ip6_hdr);
645 } else {
646 u_char *p;
647 int maxlen, maxhlen;
648
649 if ((icmp6_nodeinfo & 5) != 5)
650 break;
651
652 if (code != 0)
653 goto badcode;
654 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
655 if (maxlen >= MCLBYTES) {
656 /* Give up remote */
657 break;
658 }
659 MGETHDR(n, M_DONTWAIT, m->m_type);
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 break;
670 }
671 n->m_pkthdr.rcvif = NULL;
672 n->m_len = 0;
673 maxhlen = M_TRAILINGSPACE(n) - maxlen;
674 if (maxhlen > hostnamelen)
675 maxhlen = hostnamelen;
676 /*
677 * Copy IPv6 and ICMPv6 only.
678 */
679 nip6 = mtod(n, struct ip6_hdr *);
680 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
681 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
682 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
683 p = (u_char *)(nicmp6 + 1);
684 bzero(p, 4);
685 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
686 noff = sizeof(struct ip6_hdr);
687 M_COPY_PKTHDR(n, m); /* just for rcvif */
688 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
689 sizeof(struct icmp6_hdr) + 4 + maxhlen;
690 nicmp6->icmp6_type = ICMP6_WRUREPLY;
691 nicmp6->icmp6_code = 0;
692 }
693 #undef hostnamelen
694 if (n) {
695 icmp6stat.icp6s_reflect++;
696 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
697 icmp6_reflect(n, noff);
698 }
699 break;
700 }
701
702 case ICMP6_WRUREPLY:
703 if (code != 0)
704 goto badcode;
705 break;
706
707 case ND_ROUTER_SOLICIT:
708 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
709 if (code != 0)
710 goto badcode;
711 if (icmp6len < sizeof(struct nd_router_solicit))
712 goto badlen;
713 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
714 /* give up local */
715 nd6_rs_input(m, off, icmp6len);
716 m = NULL;
717 goto freeit;
718 }
719 nd6_rs_input(n, off, icmp6len);
720 /* m stays. */
721 break;
722
723 case ND_ROUTER_ADVERT:
724 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
725 if (code != 0)
726 goto badcode;
727 if (icmp6len < sizeof(struct nd_router_advert))
728 goto badlen;
729 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
730 /* give up local */
731 nd6_ra_input(m, off, icmp6len);
732 m = NULL;
733 goto freeit;
734 }
735 nd6_ra_input(n, off, icmp6len);
736 /* m stays. */
737 break;
738
739 case ND_NEIGHBOR_SOLICIT:
740 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
741 if (code != 0)
742 goto badcode;
743 if (icmp6len < sizeof(struct nd_neighbor_solicit))
744 goto badlen;
745 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
746 /* give up local */
747 nd6_ns_input(m, off, icmp6len);
748 m = NULL;
749 goto freeit;
750 }
751 nd6_ns_input(n, off, icmp6len);
752 /* m stays. */
753 break;
754
755 case ND_NEIGHBOR_ADVERT:
756 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
757 if (code != 0)
758 goto badcode;
759 if (icmp6len < sizeof(struct nd_neighbor_advert))
760 goto badlen;
761 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
762 /* give up local */
763 nd6_na_input(m, off, icmp6len);
764 m = NULL;
765 goto freeit;
766 }
767 nd6_na_input(n, off, icmp6len);
768 /* m stays. */
769 break;
770
771 case ND_REDIRECT:
772 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
773 if (code != 0)
774 goto badcode;
775 if (icmp6len < sizeof(struct nd_redirect))
776 goto badlen;
777 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
778 /* give up local */
779 icmp6_redirect_input(m, off);
780 m = NULL;
781 goto freeit;
782 }
783 icmp6_redirect_input(n, off);
784 /* m stays. */
785 break;
786
787 case ICMP6_ROUTER_RENUMBERING:
788 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
789 code != ICMP6_ROUTER_RENUMBERING_RESULT)
790 goto badcode;
791 if (icmp6len < sizeof(struct icmp6_router_renum))
792 goto badlen;
793 break;
794
795 default:
796 nd6log((LOG_DEBUG,
797 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
798 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
799 ip6_sprintf(&ip6->ip6_dst),
800 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
801 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
802 /* ICMPv6 error: MUST deliver it by spec... */
803 code = PRC_NCMDS;
804 /* deliver */
805 } else {
806 /* ICMPv6 informational: MUST not deliver */
807 break;
808 }
809 deliver:
810 if (icmp6_notify_error(m, off, icmp6len, code)) {
811 /* In this case, m should've been freed. */
812 return(IPPROTO_DONE);
813 }
814 break;
815
816 badcode:
817 icmp6stat.icp6s_badcode++;
818 break;
819
820 badlen:
821 icmp6stat.icp6s_badlen++;
822 break;
823 }
824
825 /* deliver the packet to appropriate sockets */
826 icmp6_rip6_input(&m, *offp);
827
828 return IPPROTO_DONE;
829
830 freeit:
831 m_freem(m);
832 return IPPROTO_DONE;
833 }
834
835 static int
836 icmp6_notify_error(m, off, icmp6len, code)
837 struct mbuf *m;
838 int off, icmp6len, code;
839 {
840 struct icmp6_hdr *icmp6;
841 struct ip6_hdr *eip6;
842 u_int32_t notifymtu;
843 struct sockaddr_in6 icmp6src, icmp6dst;
844
845 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
846 icmp6stat.icp6s_tooshort++;
847 goto freeit;
848 }
849 #ifndef PULLDOWN_TEST
850 IP6_EXTHDR_CHECK(m, off,
851 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
852 return -1);
853 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
854 #else
855 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
856 sizeof(*icmp6) + sizeof(struct ip6_hdr));
857 if (icmp6 == NULL) {
858 icmp6stat.icp6s_tooshort++;
859 return(-1);
860 }
861 #endif
862 eip6 = (struct ip6_hdr *)(icmp6 + 1);
863
864 /* Detect the upper level protocol */
865 {
866 void (*ctlfunc)(int, struct sockaddr *, void *);
867 u_int8_t nxt = eip6->ip6_nxt;
868 int eoff = off + sizeof(struct icmp6_hdr) +
869 sizeof(struct ip6_hdr);
870 struct ip6ctlparam ip6cp;
871 struct in6_addr *finaldst = NULL;
872 int icmp6type = icmp6->icmp6_type;
873 struct ip6_frag *fh;
874 struct ip6_rthdr *rth;
875 struct ip6_rthdr0 *rth0;
876 int rthlen;
877
878 while (1) { /* XXX: should avoid infinite loop explicitly? */
879 struct ip6_ext *eh;
880
881 switch (nxt) {
882 case IPPROTO_HOPOPTS:
883 case IPPROTO_DSTOPTS:
884 case IPPROTO_AH:
885 #ifndef PULLDOWN_TEST
886 IP6_EXTHDR_CHECK(m, 0, eoff +
887 sizeof(struct ip6_ext),
888 return -1);
889 eh = (struct ip6_ext *)(mtod(m, caddr_t)
890 + eoff);
891 #else
892 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
893 eoff, sizeof(*eh));
894 if (eh == NULL) {
895 icmp6stat.icp6s_tooshort++;
896 return(-1);
897 }
898 #endif
899
900 if (nxt == IPPROTO_AH)
901 eoff += (eh->ip6e_len + 2) << 2;
902 else
903 eoff += (eh->ip6e_len + 1) << 3;
904 nxt = eh->ip6e_nxt;
905 break;
906 case IPPROTO_ROUTING:
907 /*
908 * When the erroneous packet contains a
909 * routing header, we should examine the
910 * header to determine the final destination.
911 * Otherwise, we can't properly update
912 * information that depends on the final
913 * destination (e.g. path MTU).
914 */
915 #ifndef PULLDOWN_TEST
916 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
917 return -1);
918 rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
919 + eoff);
920 #else
921 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
922 eoff, sizeof(*rth));
923 if (rth == NULL) {
924 icmp6stat.icp6s_tooshort++;
925 return(-1);
926 }
927 #endif
928 rthlen = (rth->ip6r_len + 1) << 3;
929 /*
930 * XXX: currently there is no
931 * officially defined type other
932 * than type-0.
933 * Note that if the segment left field
934 * is 0, all intermediate hops must
935 * have been passed.
936 */
937 if (rth->ip6r_segleft &&
938 rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
939 int hops;
940
941 #ifndef PULLDOWN_TEST
942 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen,
943 return -1);
944 rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff);
945 #else
946 IP6_EXTHDR_GET(rth0,
947 struct ip6_rthdr0 *, m,
948 eoff, rthlen);
949 if (rth0 == NULL) {
950 icmp6stat.icp6s_tooshort++;
951 return(-1);
952 }
953 #endif
954 /* just ignore a bogus header */
955 if ((rth0->ip6r0_len % 2) == 0 &&
956 (hops = rth0->ip6r0_len/2))
957 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
958 }
959 eoff += rthlen;
960 nxt = rth->ip6r_nxt;
961 break;
962 case IPPROTO_FRAGMENT:
963 #ifndef PULLDOWN_TEST
964 IP6_EXTHDR_CHECK(m, 0, eoff +
965 sizeof(struct ip6_frag),
966 return -1);
967 fh = (struct ip6_frag *)(mtod(m, caddr_t)
968 + eoff);
969 #else
970 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
971 eoff, sizeof(*fh));
972 if (fh == NULL) {
973 icmp6stat.icp6s_tooshort++;
974 return(-1);
975 }
976 #endif
977 /*
978 * Data after a fragment header is meaningless
979 * unless it is the first fragment, but
980 * we'll go to the notify label for path MTU
981 * discovery.
982 */
983 if (fh->ip6f_offlg & IP6F_OFF_MASK)
984 goto notify;
985
986 eoff += sizeof(struct ip6_frag);
987 nxt = fh->ip6f_nxt;
988 break;
989 default:
990 /*
991 * This case includes ESP and the No Next
992 * Header. In such cases going to the notify
993 * label does not have any meaning
994 * (i.e. ctlfunc will be NULL), but we go
995 * anyway since we might have to update
996 * path MTU information.
997 */
998 goto notify;
999 }
1000 }
1001 notify:
1002 #ifndef PULLDOWN_TEST
1003 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1004 #else
1005 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1006 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1007 if (icmp6 == NULL) {
1008 icmp6stat.icp6s_tooshort++;
1009 return(-1);
1010 }
1011 #endif
1012
1013 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1014 bzero(&icmp6dst, sizeof(icmp6dst));
1015 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1016 icmp6dst.sin6_family = AF_INET6;
1017 if (finaldst == NULL)
1018 icmp6dst.sin6_addr = eip6->ip6_dst;
1019 else
1020 icmp6dst.sin6_addr = *finaldst;
1021 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1022 &icmp6dst.sin6_addr);
1023 #ifndef SCOPEDROUTING
1024 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst,
1025 NULL, NULL)) {
1026 /* should be impossbile */
1027 nd6log((LOG_DEBUG,
1028 "icmp6_notify_error: in6_embedscope failed\n"));
1029 goto freeit;
1030 }
1031 #endif
1032
1033 /*
1034 * retrieve parameters from the inner IPv6 header, and convert
1035 * them into sockaddr structures.
1036 */
1037 bzero(&icmp6src, sizeof(icmp6src));
1038 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1039 icmp6src.sin6_family = AF_INET6;
1040 icmp6src.sin6_addr = eip6->ip6_src;
1041 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1042 &icmp6src.sin6_addr);
1043 #ifndef SCOPEDROUTING
1044 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src,
1045 NULL, NULL)) {
1046 /* should be impossbile */
1047 nd6log((LOG_DEBUG,
1048 "icmp6_notify_error: in6_embedscope failed\n"));
1049 goto freeit;
1050 }
1051 #endif
1052 icmp6src.sin6_flowinfo =
1053 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1054
1055 if (finaldst == NULL)
1056 finaldst = &eip6->ip6_dst;
1057 ip6cp.ip6c_m = m;
1058 ip6cp.ip6c_icmp6 = icmp6;
1059 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1060 ip6cp.ip6c_off = eoff;
1061 ip6cp.ip6c_finaldst = finaldst;
1062 ip6cp.ip6c_src = &icmp6src;
1063 ip6cp.ip6c_nxt = nxt;
1064
1065 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1066 notifymtu = ntohl(icmp6->icmp6_mtu);
1067 ip6cp.ip6c_cmdarg = (void *)&notifymtu;
1068 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1069 }
1070
1071 ctlfunc = (void (*)(int, struct sockaddr *, void *))
1072 (ip6_protox[nxt]->pr_ctlinput);
1073 if (ctlfunc) {
1074 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
1075 &ip6cp);
1076 }
1077 }
1078 return(0);
1079
1080 freeit:
1081 m_freem(m);
1082 return(-1);
1083 }
1084
1085 void
1086 icmp6_mtudisc_update(ip6cp, validated)
1087 struct ip6ctlparam *ip6cp;
1088 int validated;
1089 {
1090 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1091 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1092 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1093 u_int mtu = ntohl(icmp6->icmp6_mtu);
1094 struct rtentry *rt = NULL;
1095 struct sockaddr_in6 sin6;
1096
1097 if (!validated)
1098 return;
1099
1100 bzero(&sin6, sizeof(sin6));
1101 sin6.sin6_family = PF_INET6;
1102 sin6.sin6_len = sizeof(struct sockaddr_in6);
1103 sin6.sin6_addr = *dst;
1104 /* XXX normally, this won't happen */
1105 if (IN6_IS_ADDR_LINKLOCAL(dst)) {
1106 sin6.sin6_addr.s6_addr16[1] =
1107 htons(m->m_pkthdr.rcvif->if_index);
1108 }
1109 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
1110 rt = rtalloc1((struct sockaddr *)&sin6, 0,
1111 RTF_CLONING | RTF_PRCLONING);
1112
1113 if (rt && (rt->rt_flags & RTF_HOST)
1114 && !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
1115 if (mtu < IPV6_MMTU) {
1116 /* xxx */
1117 rt->rt_rmx.rmx_locks |= RTV_MTU;
1118 } else if (mtu < rt->rt_ifp->if_mtu &&
1119 rt->rt_rmx.rmx_mtu > mtu) {
1120 icmp6stat.icp6s_pmtuchg++;
1121 rt->rt_rmx.rmx_mtu = mtu;
1122 }
1123 }
1124 if (rt)
1125 rtfree(rt);
1126 }
1127
1128 /*
1129 * Process a Node Information Query packet, based on
1130 * draft-ietf-ipngwg-icmp-name-lookups-07.
1131 *
1132 * Spec incompatibilities:
1133 * - IPv6 Subject address handling
1134 * - IPv4 Subject address handling support missing
1135 * - Proxy reply (answer even if it's not for me)
1136 * - joins NI group address at in6_ifattach() time only, does not cope
1137 * with hostname changes by sethostname(3)
1138 */
1139 #define hostnamelen strlen(hostname)
1140 static struct mbuf *
1141 ni6_input(m, off)
1142 struct mbuf *m;
1143 int off;
1144 {
1145 struct icmp6_nodeinfo *ni6, *nni6;
1146 struct mbuf *n = NULL;
1147 u_int16_t qtype;
1148 int subjlen;
1149 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1150 struct ni_reply_fqdn *fqdn;
1151 int addrs; /* for NI_QTYPE_NODEADDR */
1152 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1153 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
1154 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
1155 struct ip6_hdr *ip6;
1156 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1157 char *subj = NULL;
1158 struct in6_ifaddr *ia6 = NULL;
1159
1160 ip6 = mtod(m, struct ip6_hdr *);
1161 #ifndef PULLDOWN_TEST
1162 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1163 #else
1164 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1165 if (ni6 == NULL) {
1166 /* m is already reclaimed */
1167 return NULL;
1168 }
1169 #endif
1170
1171 /*
1172 * Validate IPv6 destination address.
1173 *
1174 * The Responder must discard the Query without further processing
1175 * unless it is one of the Responder's unicast or anycast addresses, or
1176 * a link-local scope multicast address which the Responder has joined.
1177 * [icmp-name-lookups-07, Section 4.]
1178 */
1179 bzero(&sin6, sizeof(sin6));
1180 sin6.sin6_family = AF_INET6;
1181 sin6.sin6_len = sizeof(struct sockaddr_in6);
1182 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
1183 /* XXX scopeid */
1184 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) {
1185 /* unicast/anycast, fine */
1186 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1187 (icmp6_nodeinfo & 4) == 0) {
1188 ifafree(&ia6->ia_ifa);
1189 ia6 = NULL;
1190 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1191 "a temporary address in %s:%d",
1192 __FILE__, __LINE__));
1193 goto bad;
1194 }
1195 ifafree(&ia6->ia_ifa);
1196 ia6 = NULL;
1197 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr))
1198 ; /* link-local multicast, fine */
1199 else
1200 goto bad;
1201
1202 /* validate query Subject field. */
1203 qtype = ntohs(ni6->ni_qtype);
1204 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1205 switch (qtype) {
1206 case NI_QTYPE_NOOP:
1207 case NI_QTYPE_SUPTYPES:
1208 /* 07 draft */
1209 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1210 break;
1211 /* FALLTHROUGH */
1212 case NI_QTYPE_FQDN:
1213 case NI_QTYPE_NODEADDR:
1214 switch (ni6->ni_code) {
1215 case ICMP6_NI_SUBJ_IPV6:
1216 #if ICMP6_NI_SUBJ_IPV6 != 0
1217 case 0:
1218 #endif
1219 /*
1220 * backward compatibility - try to accept 03 draft
1221 * format, where no Subject is present.
1222 */
1223 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1224 subjlen == 0) {
1225 oldfqdn++;
1226 break;
1227 }
1228 #if ICMP6_NI_SUBJ_IPV6 != 0
1229 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1230 goto bad;
1231 #endif
1232
1233 if (subjlen != sizeof(sin6.sin6_addr))
1234 goto bad;
1235
1236 /*
1237 * Validate Subject address.
1238 *
1239 * Not sure what exactly "address belongs to the node"
1240 * means in the spec, is it just unicast, or what?
1241 *
1242 * At this moment we consider Subject address as
1243 * "belong to the node" if the Subject address equals
1244 * to the IPv6 destination address; validation for
1245 * IPv6 destination address should have done enough
1246 * check for us.
1247 *
1248 * We do not do proxy at this moment.
1249 */
1250 /* m_pulldown instead of copy? */
1251 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1252 subjlen, (caddr_t)&sin6.sin6_addr);
1253 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1254 &sin6.sin6_addr);
1255 #ifndef SCOPEDROUTING
1256 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL);
1257 #endif
1258 bzero(&sin6_d, sizeof(sin6_d));
1259 sin6_d.sin6_family = AF_INET6; /* not used, actually */
1260 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */
1261 sin6_d.sin6_addr = ip6->ip6_dst;
1262 sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1263 &ip6->ip6_dst);
1264 #ifndef SCOPEDROUTING
1265 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL);
1266 #endif
1267 subj = (char *)&sin6;
1268 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
1269 break;
1270
1271 /*
1272 * XXX if we are to allow other cases, we should really
1273 * be careful about scope here.
1274 * basically, we should disallow queries toward IPv6
1275 * destination X with subject Y, if scope(X) > scope(Y).
1276 * if we allow scope(X) > scope(Y), it will result in
1277 * information leakage across scope boundary.
1278 */
1279 goto bad;
1280
1281 case ICMP6_NI_SUBJ_FQDN:
1282 /*
1283 * Validate Subject name with gethostname(3).
1284 *
1285 * The behavior may need some debate, since:
1286 * - we are not sure if the node has FQDN as
1287 * hostname (returned by gethostname(3)).
1288 * - the code does wildcard match for truncated names.
1289 * however, we are not sure if we want to perform
1290 * wildcard match, if gethostname(3) side has
1291 * truncated hostname.
1292 */
1293 n = ni6_nametodns(hostname, hostnamelen, 0);
1294 if (!n || n->m_next || n->m_len == 0)
1295 goto bad;
1296 IP6_EXTHDR_GET(subj, char *, m,
1297 off + sizeof(struct icmp6_nodeinfo), subjlen);
1298 if (subj == NULL)
1299 goto bad;
1300 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1301 n->m_len)) {
1302 goto bad;
1303 }
1304 m_freem(n);
1305 n = NULL;
1306 break;
1307
1308 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1309 default:
1310 goto bad;
1311 }
1312 break;
1313 }
1314
1315 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1316 switch (qtype) {
1317 case NI_QTYPE_FQDN:
1318 if ((icmp6_nodeinfo & 1) == 0)
1319 goto bad;
1320 break;
1321 case NI_QTYPE_NODEADDR:
1322 if ((icmp6_nodeinfo & 2) == 0)
1323 goto bad;
1324 break;
1325 }
1326
1327 /* guess reply length */
1328 switch (qtype) {
1329 case NI_QTYPE_NOOP:
1330 break; /* no reply data */
1331 case NI_QTYPE_SUPTYPES:
1332 replylen += sizeof(u_int32_t);
1333 break;
1334 case NI_QTYPE_FQDN:
1335 /* XXX will append an mbuf */
1336 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1337 break;
1338 case NI_QTYPE_NODEADDR:
1339 addrs = ni6_addrs(ni6, &ifp, subj);
1340 if ((replylen += addrs * (sizeof(struct in6_addr) +
1341 sizeof(u_int32_t))) > MCLBYTES)
1342 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1343 break;
1344 default:
1345 /*
1346 * XXX: We must return a reply with the ICMP6 code
1347 * `unknown Qtype' in this case. However we regard the case
1348 * as an FQDN query for backward compatibility.
1349 * Older versions set a random value to this field,
1350 * so it rarely varies in the defined qtypes.
1351 * But the mechanism is not reliable...
1352 * maybe we should obsolete older versions.
1353 */
1354 qtype = NI_QTYPE_FQDN;
1355 /* XXX will append an mbuf */
1356 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1357 oldfqdn++;
1358 break;
1359 }
1360
1361 /* allocate an mbuf to reply. */
1362 MGETHDR(n, M_DONTWAIT, m->m_type);
1363 if (n == NULL) {
1364 m_freem(m);
1365 return(NULL);
1366 }
1367 M_COPY_PKTHDR(n, m); /* just for recvif */
1368 if (replylen > MHLEN) {
1369 if (replylen > MCLBYTES) {
1370 /*
1371 * XXX: should we try to allocate more? But MCLBYTES
1372 * is probably much larger than IPV6_MMTU...
1373 */
1374 goto bad;
1375 }
1376 MCLGET(n, M_DONTWAIT);
1377 if ((n->m_flags & M_EXT) == 0) {
1378 goto bad;
1379 }
1380 }
1381 n->m_pkthdr.len = n->m_len = replylen;
1382
1383 /* copy mbuf header and IPv6 + Node Information base headers */
1384 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1385 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1386 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1387
1388 /* qtype dependent procedure */
1389 switch (qtype) {
1390 case NI_QTYPE_NOOP:
1391 nni6->ni_code = ICMP6_NI_SUCCESS;
1392 nni6->ni_flags = 0;
1393 break;
1394 case NI_QTYPE_SUPTYPES:
1395 {
1396 u_int32_t v;
1397 nni6->ni_code = ICMP6_NI_SUCCESS;
1398 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1399 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1400 v = (u_int32_t)htonl(0x0000000f);
1401 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1402 break;
1403 }
1404 case NI_QTYPE_FQDN:
1405 nni6->ni_code = ICMP6_NI_SUCCESS;
1406 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1407 sizeof(struct ip6_hdr) +
1408 sizeof(struct icmp6_nodeinfo));
1409 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1410 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1411 /*
1412 * XXX do we really have FQDN in variable "hostname"?
1413 */
1414 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1415 if (n->m_next == NULL)
1416 goto bad;
1417 /* XXX we assume that n->m_next is not a chain */
1418 if (n->m_next->m_next != NULL)
1419 goto bad;
1420 n->m_pkthdr.len += n->m_next->m_len;
1421 break;
1422 case NI_QTYPE_NODEADDR:
1423 {
1424 int lenlim, copied;
1425
1426 nni6->ni_code = ICMP6_NI_SUCCESS;
1427 n->m_pkthdr.len = n->m_len =
1428 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1429 lenlim = M_TRAILINGSPACE(n);
1430 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1431 /* XXX: reset mbuf length */
1432 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1433 sizeof(struct icmp6_nodeinfo) + copied;
1434 break;
1435 }
1436 default:
1437 break; /* XXX impossible! */
1438 }
1439
1440 nni6->ni_type = ICMP6_NI_REPLY;
1441 m_freem(m);
1442 return(n);
1443
1444 bad:
1445 m_freem(m);
1446 if (n)
1447 m_freem(n);
1448 return(NULL);
1449 }
1450 #undef hostnamelen
1451
1452 /*
1453 * make a mbuf with DNS-encoded string. no compression support.
1454 *
1455 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1456 * treated as truncated name (two \0 at the end). this is a wild guess.
1457 */
1458 static struct mbuf *
1459 ni6_nametodns(name, namelen, old)
1460 const char *name;
1461 int namelen;
1462 int old; /* return pascal string if non-zero */
1463 {
1464 struct mbuf *m;
1465 char *cp, *ep;
1466 const char *p, *q;
1467 int i, len, nterm;
1468
1469 if (old)
1470 len = namelen + 1;
1471 else
1472 len = MCLBYTES;
1473
1474 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1475 MGET(m, M_DONTWAIT, MT_DATA);
1476 if (m && len > MLEN) {
1477 MCLGET(m, M_DONTWAIT);
1478 if ((m->m_flags & M_EXT) == 0)
1479 goto fail;
1480 }
1481 if (!m)
1482 goto fail;
1483 m->m_next = NULL;
1484
1485 if (old) {
1486 m->m_len = len;
1487 *mtod(m, char *) = namelen;
1488 bcopy(name, mtod(m, char *) + 1, namelen);
1489 return m;
1490 } else {
1491 m->m_len = 0;
1492 cp = mtod(m, char *);
1493 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1494
1495 /* if not certain about my name, return empty buffer */
1496 if (namelen == 0)
1497 return m;
1498
1499 /*
1500 * guess if it looks like shortened hostname, or FQDN.
1501 * shortened hostname needs two trailing "\0".
1502 */
1503 i = 0;
1504 for (p = name; p < name + namelen; p++) {
1505 if (*p && *p == '.')
1506 i++;
1507 }
1508 if (i < 2)
1509 nterm = 2;
1510 else
1511 nterm = 1;
1512
1513 p = name;
1514 while (cp < ep && p < name + namelen) {
1515 i = 0;
1516 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1517 i++;
1518 /* result does not fit into mbuf */
1519 if (cp + i + 1 >= ep)
1520 goto fail;
1521 /*
1522 * DNS label length restriction, RFC1035 page 8.
1523 * "i == 0" case is included here to avoid returning
1524 * 0-length label on "foo..bar".
1525 */
1526 if (i <= 0 || i >= 64)
1527 goto fail;
1528 *cp++ = i;
1529 bcopy(p, cp, i);
1530 cp += i;
1531 p = q;
1532 if (p < name + namelen && *p == '.')
1533 p++;
1534 }
1535 /* termination */
1536 if (cp + nterm >= ep)
1537 goto fail;
1538 while (nterm-- > 0)
1539 *cp++ = '\0';
1540 m->m_len = cp - mtod(m, char *);
1541 return m;
1542 }
1543
1544 panic("should not reach here");
1545 /* NOTREACHED */
1546
1547 fail:
1548 if (m)
1549 m_freem(m);
1550 return NULL;
1551 }
1552
1553 /*
1554 * check if two DNS-encoded string matches. takes care of truncated
1555 * form (with \0\0 at the end). no compression support.
1556 * XXX upper/lowercase match (see RFC2065)
1557 */
1558 static int
1559 ni6_dnsmatch(a, alen, b, blen)
1560 const char *a;
1561 int alen;
1562 const char *b;
1563 int blen;
1564 {
1565 const char *a0, *b0;
1566 int l;
1567
1568 /* simplest case - need validation? */
1569 if (alen == blen && bcmp(a, b, alen) == 0)
1570 return 1;
1571
1572 a0 = a;
1573 b0 = b;
1574
1575 /* termination is mandatory */
1576 if (alen < 2 || blen < 2)
1577 return 0;
1578 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1579 return 0;
1580 alen--;
1581 blen--;
1582
1583 while (a - a0 < alen && b - b0 < blen) {
1584 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1585 return 0;
1586
1587 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1588 return 0;
1589 /* we don't support compression yet */
1590 if (a[0] >= 64 || b[0] >= 64)
1591 return 0;
1592
1593 /* truncated case */
1594 if (a[0] == 0 && a - a0 == alen - 1)
1595 return 1;
1596 if (b[0] == 0 && b - b0 == blen - 1)
1597 return 1;
1598 if (a[0] == 0 || b[0] == 0)
1599 return 0;
1600
1601 if (a[0] != b[0])
1602 return 0;
1603 l = a[0];
1604 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1605 return 0;
1606 if (bcmp(a + 1, b + 1, l) != 0)
1607 return 0;
1608
1609 a += 1 + l;
1610 b += 1 + l;
1611 }
1612
1613 if (a - a0 == alen && b - b0 == blen)
1614 return 1;
1615 else
1616 return 0;
1617 }
1618
1619 /*
1620 * calculate the number of addresses to be returned in the node info reply.
1621 */
1622 static int
1623 ni6_addrs(ni6, ifpp, subj)
1624 struct icmp6_nodeinfo *ni6;
1625 struct ifnet **ifpp;
1626 char *subj;
1627 {
1628 struct ifnet *ifp;
1629 struct in6_ifaddr *ifa6;
1630 struct ifaddr *ifa;
1631 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
1632 int addrs = 0, addrsofif, iffound = 0;
1633 int niflags = ni6->ni_flags;
1634
1635 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1636 switch (ni6->ni_code) {
1637 case ICMP6_NI_SUBJ_IPV6:
1638 if (subj == NULL) /* must be impossible... */
1639 return(0);
1640 subj_ip6 = (struct sockaddr_in6 *)subj;
1641 break;
1642 default:
1643 /*
1644 * XXX: we only support IPv6 subject address for
1645 * this Qtype.
1646 */
1647 return(0);
1648 }
1649 }
1650
1651 ifnet_head_lock_shared();
1652 TAILQ_FOREACH(ifp, &ifnet_head, if_list) {
1653 addrsofif = 0;
1654 ifnet_lock_shared(ifp);
1655 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1656 {
1657 if (ifa->ifa_addr->sa_family != AF_INET6)
1658 continue;
1659 ifa6 = (struct in6_ifaddr *)ifa;
1660
1661 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1662 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
1663 &ifa6->ia_addr.sin6_addr))
1664 iffound = 1;
1665
1666 /*
1667 * IPv4-mapped addresses can only be returned by a
1668 * Node Information proxy, since they represent
1669 * addresses of IPv4-only nodes, which perforce do
1670 * not implement this protocol.
1671 * [icmp-name-lookups-07, Section 5.4]
1672 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1673 * this function at this moment.
1674 */
1675
1676 /* What do we have to do about ::1? */
1677 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1678 case IPV6_ADDR_SCOPE_LINKLOCAL:
1679 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1680 continue;
1681 break;
1682 case IPV6_ADDR_SCOPE_SITELOCAL:
1683 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1684 continue;
1685 break;
1686 case IPV6_ADDR_SCOPE_GLOBAL:
1687 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1688 continue;
1689 break;
1690 default:
1691 continue;
1692 }
1693
1694 /*
1695 * check if anycast is okay.
1696 * XXX: just experimental. not in the spec.
1697 */
1698 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1699 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1700 continue; /* we need only unicast addresses */
1701 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1702 (icmp6_nodeinfo & 4) == 0) {
1703 continue;
1704 }
1705 addrsofif++; /* count the address */
1706 }
1707 ifnet_lock_done(ifp);
1708 if (iffound) {
1709 *ifpp = ifp;
1710 ifnet_head_done();
1711 return(addrsofif);
1712 }
1713
1714 addrs += addrsofif;
1715 }
1716 ifnet_head_done();
1717
1718 return(addrs);
1719 }
1720
1721 static int
1722 ni6_store_addrs(ni6, nni6, ifp0, resid)
1723 struct icmp6_nodeinfo *ni6, *nni6;
1724 struct ifnet *ifp0;
1725 int resid;
1726 {
1727 struct ifnet *ifp = ifp0;
1728 struct in6_ifaddr *ifa6;
1729 struct ifaddr *ifa;
1730 struct ifnet *ifp_dep = NULL;
1731 int copied = 0, allow_deprecated = 0;
1732 u_char *cp = (u_char *)(nni6 + 1);
1733 int niflags = ni6->ni_flags;
1734 u_int32_t ltime;
1735 struct timeval timenow;
1736
1737 getmicrotime(&timenow);
1738
1739 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1740 return(0); /* needless to copy */
1741
1742 again:
1743
1744 ifnet_head_lock_shared();
1745 if (ifp == NULL) ifp = TAILQ_FIRST(&ifnet_head);
1746
1747 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
1748 ifnet_lock_shared(ifp);
1749 for (ifa = ifp->if_addrlist.tqh_first; ifa;
1750 ifa = ifa->ifa_list.tqe_next)
1751 {
1752 if (ifa->ifa_addr->sa_family != AF_INET6)
1753 continue;
1754 ifa6 = (struct in6_ifaddr *)ifa;
1755
1756 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
1757 allow_deprecated == 0) {
1758 /*
1759 * prefererred address should be put before
1760 * deprecated addresses.
1761 */
1762
1763 /* record the interface for later search */
1764 if (ifp_dep == NULL)
1765 ifp_dep = ifp;
1766
1767 continue;
1768 }
1769 else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
1770 allow_deprecated != 0)
1771 continue; /* we now collect deprecated addrs */
1772
1773 /* What do we have to do about ::1? */
1774 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1775 case IPV6_ADDR_SCOPE_LINKLOCAL:
1776 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1777 continue;
1778 break;
1779 case IPV6_ADDR_SCOPE_SITELOCAL:
1780 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1781 continue;
1782 break;
1783 case IPV6_ADDR_SCOPE_GLOBAL:
1784 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1785 continue;
1786 break;
1787 default:
1788 continue;
1789 }
1790
1791 /*
1792 * check if anycast is okay.
1793 * XXX: just experimental. not in the spec.
1794 */
1795 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1796 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1797 continue;
1798 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1799 (icmp6_nodeinfo & 4) == 0) {
1800 continue;
1801 }
1802
1803 /* now we can copy the address */
1804 if (resid < sizeof(struct in6_addr) +
1805 sizeof(u_int32_t)) {
1806 /*
1807 * We give up much more copy.
1808 * Set the truncate flag and return.
1809 */
1810 nni6->ni_flags |=
1811 NI_NODEADDR_FLAG_TRUNCATE;
1812 ifnet_lock_done(ifp);
1813 ifnet_head_done();
1814 return(copied);
1815 }
1816
1817 /*
1818 * Set the TTL of the address.
1819 * The TTL value should be one of the following
1820 * according to the specification:
1821 *
1822 * 1. The remaining lifetime of a DHCP lease on the
1823 * address, or
1824 * 2. The remaining Valid Lifetime of a prefix from
1825 * which the address was derived through Stateless
1826 * Autoconfiguration.
1827 *
1828 * Note that we currently do not support stateful
1829 * address configuration by DHCPv6, so the former
1830 * case can't happen.
1831 */
1832 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1833 ltime = ND6_INFINITE_LIFETIME;
1834 else {
1835 if (ifa6->ia6_lifetime.ia6t_expire >
1836 timenow.tv_sec)
1837 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - timenow.tv_sec);
1838 else
1839 ltime = 0;
1840 }
1841
1842 bcopy(&ltime, cp, sizeof(u_int32_t));
1843 cp += sizeof(u_int32_t);
1844
1845 /* copy the address itself */
1846 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1847 sizeof(struct in6_addr));
1848 /* XXX: KAME link-local hack; remove ifindex */
1849 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr))
1850 ((struct in6_addr *)cp)->s6_addr16[1] = 0;
1851 cp += sizeof(struct in6_addr);
1852
1853 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1854 copied += (sizeof(struct in6_addr) +
1855 sizeof(u_int32_t));
1856 }
1857 ifnet_lock_done(ifp);
1858 if (ifp0) /* we need search only on the specified IF */
1859 break;
1860 }
1861 ifnet_head_done();
1862
1863 if (allow_deprecated == 0 && ifp_dep != NULL) {
1864 ifp = ifp_dep;
1865 allow_deprecated = 1;
1866
1867 goto again;
1868 }
1869
1870 return(copied);
1871 }
1872
1873 /*
1874 * XXX almost dup'ed code with rip6_input.
1875 */
1876 static int
1877 icmp6_rip6_input(mp, off)
1878 struct mbuf **mp;
1879 int off;
1880 {
1881 struct mbuf *m = *mp;
1882 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1883 struct in6pcb *in6p;
1884 struct in6pcb *last = NULL;
1885 struct sockaddr_in6 rip6src;
1886 struct icmp6_hdr *icmp6;
1887 struct mbuf *opts = NULL;
1888
1889 #ifndef PULLDOWN_TEST
1890 /* this is assumed to be safe. */
1891 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1892 #else
1893 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1894 if (icmp6 == NULL) {
1895 /* m is already reclaimed */
1896 return IPPROTO_DONE;
1897 }
1898 #endif
1899
1900 bzero(&rip6src, sizeof(rip6src));
1901 rip6src.sin6_len = sizeof(struct sockaddr_in6);
1902 rip6src.sin6_family = AF_INET6;
1903 /* KAME hack: recover scopeid */
1904 (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1905
1906 lck_rw_lock_shared(ripcbinfo.mtx);
1907 LIST_FOREACH(in6p, &ripcb, inp_list)
1908 {
1909 if ((in6p->inp_vflag & INP_IPV6) == 0)
1910 continue;
1911 #if HAVE_NRL_INPCB
1912 if (!(in6p->in6p_flags & INP_IPV6))
1913 continue;
1914 #endif
1915 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
1916 continue;
1917 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1918 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1919 continue;
1920 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1921 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1922 continue;
1923 if (in6p->in6p_icmp6filt
1924 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1925 in6p->in6p_icmp6filt))
1926 continue;
1927 if (last) {
1928 struct mbuf *n;
1929 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1930 if (last->in6p_flags & IN6P_CONTROLOPTS)
1931 ip6_savecontrol(last, &opts, ip6, n);
1932 /* strip intermediate headers */
1933 m_adj(n, off);
1934 if (sbappendaddr(&last->in6p_socket->so_rcv,
1935 (struct sockaddr *)&rip6src,
1936 n, opts, NULL) != 0) {
1937 sorwakeup(last->in6p_socket);
1938 }
1939 opts = NULL;
1940 }
1941 }
1942 last = in6p;
1943 }
1944 lck_rw_done(ripcbinfo.mtx);
1945 if (last) {
1946 if (last->in6p_flags & IN6P_CONTROLOPTS)
1947 ip6_savecontrol(last, &opts, ip6, m);
1948 /* strip intermediate headers */
1949 m_adj(m, off);
1950 if (sbappendaddr(&last->in6p_socket->so_rcv,
1951 (struct sockaddr *)&rip6src, m, opts, NULL) != 0) {
1952 sorwakeup(last->in6p_socket);
1953 }
1954 } else {
1955 m_freem(m);
1956 ip6stat.ip6s_delivered--;
1957 }
1958 return IPPROTO_DONE;
1959 }
1960
1961 /*
1962 * Reflect the ip6 packet back to the source.
1963 * OFF points to the icmp6 header, counted from the top of the mbuf.
1964 */
1965 void
1966 icmp6_reflect(m, off)
1967 struct mbuf *m;
1968 size_t off;
1969 {
1970 struct ip6_hdr *ip6;
1971 struct icmp6_hdr *icmp6;
1972 struct in6_ifaddr *ia;
1973 struct in6_addr t, src_storage, *src = 0;
1974 int plen;
1975 int type, code;
1976 struct ifnet *outif = NULL;
1977 struct sockaddr_in6 sa6_src, sa6_dst;
1978 #ifdef COMPAT_RFC1885
1979 int mtu = IPV6_MMTU;
1980 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst;
1981 #endif
1982
1983 /* too short to reflect */
1984 if (off < sizeof(struct ip6_hdr)) {
1985 nd6log((LOG_DEBUG,
1986 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
1987 (u_long)off, (u_long)sizeof(struct ip6_hdr),
1988 __FILE__, __LINE__));
1989 goto bad;
1990 }
1991
1992 /*
1993 * If there are extra headers between IPv6 and ICMPv6, strip
1994 * off that header first.
1995 */
1996 #if DIAGNOSTIC
1997 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
1998 panic("assumption failed in icmp6_reflect");
1999 #endif
2000 if (off > sizeof(struct ip6_hdr)) {
2001 size_t l;
2002 struct ip6_hdr nip6;
2003
2004 l = off - sizeof(struct ip6_hdr);
2005 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2006 m_adj(m, l);
2007 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2008 if (m->m_len < l) {
2009 if ((m = m_pullup(m, l)) == NULL)
2010 return;
2011 }
2012 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2013 } else /* off == sizeof(struct ip6_hdr) */ {
2014 size_t l;
2015 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2016 if (m->m_len < l) {
2017 if ((m = m_pullup(m, l)) == NULL)
2018 return;
2019 }
2020 }
2021 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
2022 ip6 = mtod(m, struct ip6_hdr *);
2023 ip6->ip6_nxt = IPPROTO_ICMPV6;
2024 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
2025 type = icmp6->icmp6_type; /* keep type for statistics */
2026 code = icmp6->icmp6_code; /* ditto. */
2027
2028 t = ip6->ip6_dst;
2029 /*
2030 * ip6_input() drops a packet if its src is multicast.
2031 * So, the src is never multicast.
2032 */
2033 ip6->ip6_dst = ip6->ip6_src;
2034
2035 /*
2036 * XXX: make sure to embed scope zone information, using
2037 * already embedded IDs or the received interface (if any).
2038 * Note that rcvif may be NULL.
2039 * TODO: scoped routing case (XXX).
2040 */
2041 bzero(&sa6_src, sizeof(sa6_src));
2042 sa6_src.sin6_family = AF_INET6;
2043 sa6_src.sin6_len = sizeof(sa6_src);
2044 sa6_src.sin6_addr = ip6->ip6_dst;
2045 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
2046 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL);
2047 bzero(&sa6_dst, sizeof(sa6_dst));
2048 sa6_dst.sin6_family = AF_INET6;
2049 sa6_dst.sin6_len = sizeof(sa6_dst);
2050 sa6_dst.sin6_addr = t;
2051 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
2052 in6_embedscope(&t, &sa6_dst, NULL, NULL);
2053
2054 #ifdef COMPAT_RFC1885
2055 /*
2056 * xxx guess MTU
2057 * RFC 1885 requires that echo reply should be truncated if it
2058 * does not fit in with (return) path MTU, but the description was
2059 * removed in the new spec.
2060 */
2061 if (icmp6_reflect_rt.ro_rt == 0 ||
2062 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) {
2063 if (icmp6_reflect_rt.ro_rt) {
2064 rtfree(icmp6_reflect_rt.ro_rt);
2065 icmp6_reflect_rt.ro_rt = 0;
2066 }
2067 bzero(sin6, sizeof(*sin6));
2068 sin6->sin6_family = PF_INET6;
2069 sin6->sin6_len = sizeof(struct sockaddr_in6);
2070 sin6->sin6_addr = ip6->ip6_dst;
2071
2072 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt,
2073 RTF_PRCLONING);
2074 }
2075
2076 if (icmp6_reflect_rt.ro_rt == 0)
2077 goto bad;
2078
2079 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST)
2080 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu)
2081 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu;
2082
2083 if (mtu < m->m_pkthdr.len) {
2084 plen -= (m->m_pkthdr.len - mtu);
2085 m_adj(m, mtu - m->m_pkthdr.len);
2086 }
2087 #endif
2088 /*
2089 * If the incoming packet was addressed directly to us(i.e. unicast),
2090 * use dst as the src for the reply.
2091 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible
2092 * (for example) when we encounter an error while forwarding procedure
2093 * destined to a duplicated address of ours.
2094 */
2095 lck_mtx_lock(nd6_mutex);
2096 for (ia = in6_ifaddrs; ia; ia = ia->ia_next)
2097 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
2098 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2099 src = &t;
2100 break;
2101 }
2102 lck_mtx_unlock(nd6_mutex);
2103 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
2104 /*
2105 * This is the case if the dst is our link-local address
2106 * and the sender is also ourselves.
2107 */
2108 src = &t;
2109 }
2110
2111 if (src == 0) {
2112 int e;
2113 struct route_in6 ro;
2114
2115 /*
2116 * This case matches to multicasts, our anycast, or unicasts
2117 * that we do not own. Select a source address based on the
2118 * source address of the erroneous packet.
2119 */
2120 bzero(&ro, sizeof(ro));
2121 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &src_storage, &e);
2122 if (ro.ro_rt)
2123 rtfree(ro.ro_rt); /* XXX: we could use this */
2124 if (src == NULL) {
2125 nd6log((LOG_DEBUG,
2126 "icmp6_reflect: source can't be determined: "
2127 "dst=%s, error=%d\n",
2128 ip6_sprintf(&sa6_src.sin6_addr), e));
2129 goto bad;
2130 }
2131 }
2132
2133 ip6->ip6_src = *src;
2134
2135 ip6->ip6_flow = 0;
2136 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2137 ip6->ip6_vfc |= IPV6_VERSION;
2138 ip6->ip6_nxt = IPPROTO_ICMPV6;
2139 if (m->m_pkthdr.rcvif) {
2140 /* XXX: This may not be the outgoing interface */
2141 ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim;
2142 } else
2143 ip6->ip6_hlim = ip6_defhlim;
2144
2145 icmp6->icmp6_cksum = 0;
2146 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2147 sizeof(struct ip6_hdr), plen);
2148
2149 /*
2150 * XXX option handling
2151 */
2152
2153 m->m_flags &= ~(M_BCAST|M_MCAST);
2154 #if IPSEC
2155 /* Don't lookup socket */
2156 if (ipsec_bypass == 0)
2157 (void)ipsec_setsocket(m, NULL);
2158 #endif /*IPSEC*/
2159
2160 #ifdef COMPAT_RFC1885
2161 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, 0);
2162 #else
2163 ip6_output(m, NULL, NULL, 0, NULL, &outif, 0);
2164 #endif
2165 if (outif)
2166 icmp6_ifoutstat_inc(outif, type, code);
2167
2168 return;
2169
2170 bad:
2171 m_freem(m);
2172 return;
2173 }
2174
2175 void
2176 icmp6_fasttimo()
2177 {
2178
2179 mld6_fasttimeo();
2180 }
2181
2182 static const char *
2183 icmp6_redirect_diag(src6, dst6, tgt6)
2184 struct in6_addr *src6;
2185 struct in6_addr *dst6;
2186 struct in6_addr *tgt6;
2187 {
2188 static char buf[1024];
2189 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2190 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
2191 return buf;
2192 }
2193
2194 void
2195 icmp6_redirect_input(m, off)
2196 struct mbuf *m;
2197 int off;
2198 {
2199 struct ifnet *ifp = m->m_pkthdr.rcvif;
2200 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2201 struct nd_redirect *nd_rd;
2202 int icmp6len = ntohs(ip6->ip6_plen);
2203 char *lladdr = NULL;
2204 int lladdrlen = 0;
2205 u_char *redirhdr = NULL;
2206 int redirhdrlen = 0;
2207 struct rtentry *rt = NULL;
2208 int is_router;
2209 int is_onlink;
2210 struct in6_addr src6 = ip6->ip6_src;
2211 struct in6_addr redtgt6;
2212 struct in6_addr reddst6;
2213 union nd_opts ndopts;
2214
2215 if (!m || !ifp)
2216 return;
2217
2218 /* XXX if we are router, we don't update route by icmp6 redirect */
2219 if (ip6_forwarding)
2220 goto freeit;
2221 if (!icmp6_rediraccept)
2222 goto freeit;
2223
2224 #ifndef PULLDOWN_TEST
2225 IP6_EXTHDR_CHECK(m, off, icmp6len, return);
2226 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2227 #else
2228 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2229 if (nd_rd == NULL) {
2230 icmp6stat.icp6s_tooshort++;
2231 return;
2232 }
2233 #endif
2234 redtgt6 = nd_rd->nd_rd_target;
2235 reddst6 = nd_rd->nd_rd_dst;
2236
2237 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2238 redtgt6.s6_addr16[1] = htons(ifp->if_index);
2239 if (IN6_IS_ADDR_LINKLOCAL(&reddst6))
2240 reddst6.s6_addr16[1] = htons(ifp->if_index);
2241
2242 /* validation */
2243 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2244 nd6log((LOG_ERR,
2245 "ICMP6 redirect sent from %s rejected; "
2246 "must be from linklocal\n", ip6_sprintf(&src6)));
2247 goto bad;
2248 }
2249 if (ip6->ip6_hlim != 255) {
2250 nd6log((LOG_ERR,
2251 "ICMP6 redirect sent from %s rejected; "
2252 "hlim=%d (must be 255)\n",
2253 ip6_sprintf(&src6), ip6->ip6_hlim));
2254 goto bad;
2255 }
2256 {
2257 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2258 struct sockaddr_in6 sin6;
2259 struct in6_addr *gw6;
2260
2261 bzero(&sin6, sizeof(sin6));
2262 sin6.sin6_family = AF_INET6;
2263 sin6.sin6_len = sizeof(struct sockaddr_in6);
2264 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
2265 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
2266 if (rt) {
2267 if (rt->rt_gateway == NULL ||
2268 rt->rt_gateway->sa_family != AF_INET6) {
2269 nd6log((LOG_ERR,
2270 "ICMP6 redirect rejected; no route "
2271 "with inet6 gateway found for redirect dst: %s\n",
2272 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2273 rtfree(rt);
2274 goto bad;
2275 }
2276
2277 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2278 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2279 nd6log((LOG_ERR,
2280 "ICMP6 redirect rejected; "
2281 "not equal to gw-for-src=%s (must be same): "
2282 "%s\n",
2283 ip6_sprintf(gw6),
2284 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2285 rtfree(rt);
2286 goto bad;
2287 }
2288 } else {
2289 nd6log((LOG_ERR,
2290 "ICMP6 redirect rejected; "
2291 "no route found for redirect dst: %s\n",
2292 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2293 goto bad;
2294 }
2295 rtfree(rt);
2296 rt = NULL;
2297 }
2298 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2299 nd6log((LOG_ERR,
2300 "ICMP6 redirect rejected; "
2301 "redirect dst must be unicast: %s\n",
2302 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2303 goto bad;
2304 }
2305
2306 is_router = is_onlink = 0;
2307 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2308 is_router = 1; /* router case */
2309 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2310 is_onlink = 1; /* on-link destination case */
2311 if (!is_router && !is_onlink) {
2312 nd6log((LOG_ERR,
2313 "ICMP6 redirect rejected; "
2314 "neither router case nor onlink case: %s\n",
2315 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2316 goto bad;
2317 }
2318 /* validation passed */
2319
2320 icmp6len -= sizeof(*nd_rd);
2321 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2322 if (nd6_options(&ndopts) < 0) {
2323 nd6log((LOG_INFO, "icmp6_redirect_input: "
2324 "invalid ND option, rejected: %s\n",
2325 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2326 /* nd6_options have incremented stats */
2327 goto freeit;
2328 }
2329
2330 if (ndopts.nd_opts_tgt_lladdr) {
2331 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2332 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2333 }
2334
2335 if (ndopts.nd_opts_rh) {
2336 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2337 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2338 }
2339
2340 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2341 nd6log((LOG_INFO,
2342 "icmp6_redirect_input: lladdrlen mismatch for %s "
2343 "(if %d, icmp6 packet %d): %s\n",
2344 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
2345 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2346 goto bad;
2347 }
2348
2349 /* RFC 2461 8.3 */
2350 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2351 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2352
2353 if (!is_onlink) { /* better router case. perform rtredirect. */
2354 /* perform rtredirect */
2355 struct sockaddr_in6 sdst;
2356 struct sockaddr_in6 sgw;
2357 struct sockaddr_in6 ssrc;
2358
2359 bzero(&sdst, sizeof(sdst));
2360 bzero(&sgw, sizeof(sgw));
2361 bzero(&ssrc, sizeof(ssrc));
2362 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2363 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2364 sizeof(struct sockaddr_in6);
2365 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2366 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2367 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2368 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
2369 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST,
2370 (struct sockaddr *)&ssrc,
2371 (struct rtentry **)NULL);
2372 }
2373 /* finally update cached route in each socket via pfctlinput */
2374 {
2375 struct sockaddr_in6 sdst;
2376
2377 bzero(&sdst, sizeof(sdst));
2378 sdst.sin6_family = AF_INET6;
2379 sdst.sin6_len = sizeof(struct sockaddr_in6);
2380 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2381 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2382 #if IPSEC
2383 key_sa_routechange((struct sockaddr *)&sdst);
2384 #endif
2385 }
2386
2387 freeit:
2388 m_freem(m);
2389 return;
2390
2391 bad:
2392 icmp6stat.icp6s_badredirect++;
2393 m_freem(m);
2394 }
2395
2396 void
2397 icmp6_redirect_output(m0, rt)
2398 struct mbuf *m0;
2399 struct rtentry *rt;
2400 {
2401 struct ifnet *ifp; /* my outgoing interface */
2402 struct in6_addr ifp_ll6;
2403 struct in6_addr *router_ll6;
2404 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2405 struct mbuf *m = NULL; /* newly allocated one */
2406 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2407 struct nd_redirect *nd_rd;
2408 size_t maxlen;
2409 u_char *p;
2410 struct ifnet *outif = NULL;
2411 struct sockaddr_in6 src_sa;
2412
2413 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2414
2415 /* sanity check */
2416 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2417 goto fail;
2418
2419 /* if we are not router, we don't send icmp6 redirect */
2420 if (!ip6_forwarding || ip6_accept_rtadv || (ifp->if_eflags & IFEF_ACCEPT_RTADVD))
2421 goto fail;
2422
2423 /*
2424 * Address check:
2425 * the source address must identify a neighbor, and
2426 * the destination address must not be a multicast address
2427 * [RFC 2461, sec 8.2]
2428 */
2429 sip6 = mtod(m0, struct ip6_hdr *);
2430 bzero(&src_sa, sizeof(src_sa));
2431 src_sa.sin6_family = AF_INET6;
2432 src_sa.sin6_len = sizeof(src_sa);
2433 src_sa.sin6_addr = sip6->ip6_src;
2434 /* we don't currently use sin6_scope_id, but eventually use it */
2435 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src);
2436 if (nd6_is_addr_neighbor(&src_sa, ifp, 0) == 0)
2437 goto fail;
2438 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2439 goto fail; /* what should we do here? */
2440
2441 /* rate limit */
2442 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2443 goto fail;
2444
2445 /*
2446 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2447 * we almost always ask for an mbuf cluster for simplicity.
2448 * (MHLEN < IPV6_MMTU is almost always true)
2449 */
2450 #if IPV6_MMTU >= MCLBYTES
2451 # error assumption failed about IPV6_MMTU and MCLBYTES
2452 #endif
2453 MGETHDR(m, M_DONTWAIT, MT_HEADER);
2454 if (m && IPV6_MMTU >= MHLEN)
2455 MCLGET(m, M_DONTWAIT);
2456 if (!m)
2457 goto fail;
2458 m->m_pkthdr.rcvif = NULL;
2459 m->m_len = 0;
2460 maxlen = M_TRAILINGSPACE(m);
2461 maxlen = min(IPV6_MMTU, maxlen);
2462 /* just for safety */
2463 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2464 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2465 goto fail;
2466 }
2467
2468 {
2469 /* get ip6 linklocal address for ifp(my outgoing interface). */
2470 struct in6_ifaddr *ia;
2471 if ((ia = in6ifa_ifpforlinklocal(ifp,
2472 IN6_IFF_NOTREADY|
2473 IN6_IFF_ANYCAST)) == NULL)
2474 goto fail;
2475 ifp_ll6 = ia->ia_addr.sin6_addr;
2476 ifafree(&ia->ia_ifa);
2477 }
2478
2479 /* get ip6 linklocal address for the router. */
2480 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2481 struct sockaddr_in6 *sin6;
2482 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2483 router_ll6 = &sin6->sin6_addr;
2484 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2485 router_ll6 = (struct in6_addr *)NULL;
2486 } else
2487 router_ll6 = (struct in6_addr *)NULL;
2488
2489 /* ip6 */
2490 ip6 = mtod(m, struct ip6_hdr *);
2491 ip6->ip6_flow = 0;
2492 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2493 ip6->ip6_vfc |= IPV6_VERSION;
2494 /* ip6->ip6_plen will be set later */
2495 ip6->ip6_nxt = IPPROTO_ICMPV6;
2496 ip6->ip6_hlim = 255;
2497 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2498 bcopy(&ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2499 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2500
2501 /* ND Redirect */
2502 nd_rd = (struct nd_redirect *)(ip6 + 1);
2503 nd_rd->nd_rd_type = ND_REDIRECT;
2504 nd_rd->nd_rd_code = 0;
2505 nd_rd->nd_rd_reserved = 0;
2506 if (rt->rt_flags & RTF_GATEWAY) {
2507 /*
2508 * nd_rd->nd_rd_target must be a link-local address in
2509 * better router cases.
2510 */
2511 if (!router_ll6)
2512 goto fail;
2513 bcopy(router_ll6, &nd_rd->nd_rd_target,
2514 sizeof(nd_rd->nd_rd_target));
2515 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2516 sizeof(nd_rd->nd_rd_dst));
2517 } else {
2518 /* make sure redtgt == reddst */
2519 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2520 sizeof(nd_rd->nd_rd_target));
2521 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2522 sizeof(nd_rd->nd_rd_dst));
2523 }
2524
2525 p = (u_char *)(nd_rd + 1);
2526
2527 if (!router_ll6)
2528 goto nolladdropt;
2529
2530 {
2531 /* target lladdr option */
2532 struct rtentry *rt_router = NULL;
2533 int len;
2534 struct sockaddr_dl *sdl;
2535 struct nd_opt_hdr *nd_opt;
2536 char *lladdr;
2537
2538 rt_router = nd6_lookup(router_ll6, 0, ifp, 0);
2539 if (!rt_router)
2540 goto nolladdropt;
2541 len = sizeof(*nd_opt) + ifp->if_addrlen;
2542 len = (len + 7) & ~7; /* round by 8 */
2543 /* safety check */
2544 if (len + (p - (u_char *)ip6) > maxlen)
2545 goto nolladdropt;
2546 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2547 (rt_router->rt_flags & RTF_LLINFO) &&
2548 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2549 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
2550 sdl->sdl_alen) {
2551 nd_opt = (struct nd_opt_hdr *)p;
2552 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2553 nd_opt->nd_opt_len = len >> 3;
2554 lladdr = (char *)(nd_opt + 1);
2555 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2556 p += len;
2557 }
2558 }
2559 nolladdropt:;
2560
2561 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2562
2563 /* just to be safe */
2564 #ifdef M_DECRYPTED /*not openbsd*/
2565 if (m0->m_flags & M_DECRYPTED)
2566 goto noredhdropt;
2567 #endif
2568 if (p - (u_char *)ip6 > maxlen)
2569 goto noredhdropt;
2570
2571 {
2572 /* redirected header option */
2573 int len;
2574 struct nd_opt_rd_hdr *nd_opt_rh;
2575
2576 /*
2577 * compute the maximum size for icmp6 redirect header option.
2578 * XXX room for auth header?
2579 */
2580 len = maxlen - (p - (u_char *)ip6);
2581 len &= ~7;
2582
2583 /* This is just for simplicity. */
2584 if (m0->m_pkthdr.len != m0->m_len) {
2585 if (m0->m_next) {
2586 m_freem(m0->m_next);
2587 m0->m_next = NULL;
2588 }
2589 m0->m_pkthdr.len = m0->m_len;
2590 }
2591
2592 /*
2593 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2594 * about padding/truncate rule for the original IP packet.
2595 * From the discussion on IPv6imp in Feb 1999, the consensus was:
2596 * - "attach as much as possible" is the goal
2597 * - pad if not aligned (original size can be guessed by original
2598 * ip6 header)
2599 * Following code adds the padding if it is simple enough,
2600 * and truncates if not.
2601 */
2602 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2603 panic("assumption failed in %s:%d\n", __FILE__, __LINE__);
2604
2605 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2606 /* not enough room, truncate */
2607 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2608 } else {
2609 /* enough room, pad or truncate */
2610 size_t extra;
2611
2612 extra = m0->m_pkthdr.len % 8;
2613 if (extra) {
2614 /* pad if easy enough, truncate if not */
2615 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2616 /* pad */
2617 m0->m_len += (8 - extra);
2618 m0->m_pkthdr.len += (8 - extra);
2619 } else {
2620 /* truncate */
2621 m0->m_pkthdr.len -= extra;
2622 m0->m_len -= extra;
2623 }
2624 }
2625 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2626 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2627 }
2628
2629 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2630 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2631 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2632 nd_opt_rh->nd_opt_rh_len = len >> 3;
2633 p += sizeof(*nd_opt_rh);
2634 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2635
2636 /* connect m0 to m */
2637 m->m_next = m0;
2638 m->m_pkthdr.len = m->m_len + m0->m_len;
2639 }
2640 noredhdropt:;
2641
2642 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src))
2643 sip6->ip6_src.s6_addr16[1] = 0;
2644 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst))
2645 sip6->ip6_dst.s6_addr16[1] = 0;
2646 #if 0
2647 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
2648 ip6->ip6_src.s6_addr16[1] = 0;
2649 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
2650 ip6->ip6_dst.s6_addr16[1] = 0;
2651 #endif
2652 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target))
2653 nd_rd->nd_rd_target.s6_addr16[1] = 0;
2654 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst))
2655 nd_rd->nd_rd_dst.s6_addr16[1] = 0;
2656
2657 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2658
2659 nd_rd->nd_rd_cksum = 0;
2660 nd_rd->nd_rd_cksum
2661 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2662
2663 /* send the packet to outside... */
2664 #if IPSEC
2665 /* Don't lookup socket */
2666 if (ipsec_bypass == 0)
2667 (void)ipsec_setsocket(m, NULL);
2668 #endif /*IPSEC*/
2669 ip6_output(m, NULL, NULL, 0, NULL, &outif, 0);
2670 if (outif) {
2671 icmp6_ifstat_inc(outif, ifs6_out_msg);
2672 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2673 }
2674 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2675
2676 return;
2677
2678 fail:
2679 if (m)
2680 m_freem(m);
2681 if (m0)
2682 m_freem(m0);
2683 }
2684
2685 #if HAVE_NRL_INPCB
2686 #define sotoin6pcb sotoinpcb
2687 #define in6pcb inpcb
2688 #define in6p_icmp6filt inp_icmp6filt
2689 #endif
2690 /*
2691 * ICMPv6 socket option processing.
2692 */
2693 int
2694 icmp6_ctloutput(so, sopt)
2695 struct socket *so;
2696 struct sockopt *sopt;
2697 {
2698 int error = 0;
2699 int optlen;
2700 struct inpcb *inp = sotoinpcb(so);
2701 int level, op, optname;
2702
2703 if (sopt) {
2704 level = sopt->sopt_level;
2705 op = sopt->sopt_dir;
2706 optname = sopt->sopt_name;
2707 optlen = sopt->sopt_valsize;
2708 } else
2709 level = op = optname = optlen = 0;
2710
2711 if (level != IPPROTO_ICMPV6) {
2712 return EINVAL;
2713 }
2714
2715 switch (op) {
2716 case PRCO_SETOPT:
2717 switch (optname) {
2718 case ICMP6_FILTER:
2719 {
2720 struct icmp6_filter *p;
2721
2722 if (optlen != sizeof(*p)) {
2723 error = EMSGSIZE;
2724 break;
2725 }
2726 if (inp->in6p_icmp6filt == NULL) {
2727 error = EINVAL;
2728 break;
2729 }
2730 error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen,
2731 optlen);
2732 break;
2733 }
2734
2735 default:
2736 error = ENOPROTOOPT;
2737 break;
2738 }
2739 break;
2740
2741 case PRCO_GETOPT:
2742 switch (optname) {
2743 case ICMP6_FILTER:
2744 {
2745 if (inp->in6p_icmp6filt == NULL) {
2746 error = EINVAL;
2747 break;
2748 }
2749 error = sooptcopyout(sopt, inp->in6p_icmp6filt,
2750 sizeof(struct icmp6_filter));
2751 break;
2752 }
2753
2754 default:
2755 error = ENOPROTOOPT;
2756 break;
2757 }
2758 break;
2759 }
2760
2761 return(error);
2762 }
2763 #if HAVE_NRL_INPCB
2764 #undef sotoin6pcb
2765 #undef in6pcb
2766 #undef in6p_icmp6filt
2767 #endif
2768
2769 #ifndef HAVE_PPSRATECHECK
2770 #ifndef timersub
2771 #define timersub(tvp, uvp, vvp) \
2772 do { \
2773 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
2774 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
2775 if ((vvp)->tv_usec < 0) { \
2776 (vvp)->tv_sec--; \
2777 (vvp)->tv_usec += 1000000; \
2778 } \
2779 } while (0)
2780 #endif
2781
2782 /*
2783 * ppsratecheck(): packets (or events) per second limitation.
2784 */
2785 static int
2786 ppsratecheck(lasttime, curpps, maxpps)
2787 struct timeval *lasttime;
2788 int *curpps;
2789 int maxpps; /* maximum pps allowed */
2790 {
2791 struct timeval tv, delta;
2792 int s, rv;
2793
2794 s = splclock();
2795 microtime(&tv);
2796 splx(s);
2797
2798 timersub(&tv, lasttime, &delta);
2799
2800 /*
2801 * Check for 0,0 so that the message will be seen at least once.
2802 * If more than one second has passed since the last update of
2803 * lasttime, reset the counter.
2804 *
2805 * we do increment *curpps even in *curpps < maxpps case, as some may
2806 * try to use *curpps for stat purposes as well.
2807 */
2808 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
2809 delta.tv_sec >= 1) {
2810 *lasttime = tv;
2811 *curpps = 0;
2812 rv = 1;
2813 } else if (maxpps < 0)
2814 rv = 1;
2815 else if (*curpps < maxpps)
2816 rv = 1;
2817 else
2818 rv = 0;
2819
2820 #if 1 /* DIAGNOSTIC? */
2821 /* be careful about wrap-around */
2822 if (*curpps + 1 > *curpps)
2823 *curpps = *curpps + 1;
2824 #else
2825 /*
2826 * assume that there's not too many calls to this function.
2827 * not sure if the assumption holds, as it depends on *caller's*
2828 * behavior, not the behavior of this function.
2829 * IMHO it is wrong to make assumption on the caller's behavior,
2830 * so the above #if is #if 1, not #ifdef DIAGNOSTIC.
2831 */
2832 *curpps = *curpps + 1;
2833 #endif
2834
2835 return (rv);
2836 }
2837 #endif
2838
2839 /*
2840 * Perform rate limit check.
2841 * Returns 0 if it is okay to send the icmp6 packet.
2842 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2843 * limitation.
2844 *
2845 * XXX per-destination/type check necessary?
2846 */
2847 static int
2848 icmp6_ratelimit(dst, type, code)
2849 const struct in6_addr *dst; /* not used at this moment */
2850 const int type; /* not used at this moment */
2851 const int code; /* not used at this moment */
2852 {
2853 int ret;
2854
2855 ret = 0; /* okay to send */
2856
2857 /* PPS limit */
2858 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2859 icmp6errppslim)) {
2860 /* The packet is subject to rate limit */
2861 ret++;
2862 }
2863
2864 return ret;
2865 }
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