FreeBSD/Linux Kernel Cross Reference
sys/netinet6/icmp6.c
1 /* $FreeBSD: releng/5.1/sys/netinet6/icmp6.c 114205 2003-04-29 08:43:56Z suz $ */
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 #include "opt_inet.h"
69 #include "opt_inet6.h"
70 #include "opt_ipsec.h"
71
72 #include <sys/param.h>
73 #include <sys/domain.h>
74 #include <sys/kernel.h>
75 #include <sys/lock.h>
76 #include <sys/malloc.h>
77 #include <sys/mbuf.h>
78 #include <sys/protosw.h>
79 #include <sys/signalvar.h>
80 #include <sys/socket.h>
81 #include <sys/socketvar.h>
82 #include <sys/sx.h>
83 #include <sys/syslog.h>
84 #include <sys/systm.h>
85 #include <sys/time.h>
86
87 #include <net/if.h>
88 #include <net/if_dl.h>
89 #include <net/if_types.h>
90 #include <net/route.h>
91
92 #include <netinet/in.h>
93 #include <netinet/in_pcb.h>
94 #include <netinet/in_var.h>
95 #include <netinet/ip6.h>
96 #include <netinet/icmp6.h>
97 #include <netinet6/in6_ifattach.h>
98 #include <netinet6/in6_pcb.h>
99 #include <netinet6/ip6protosw.h>
100 #include <netinet6/ip6_var.h>
101 #include <netinet6/mld6_var.h>
102 #include <netinet6/nd6.h>
103
104 #ifdef IPSEC
105 #include <netinet6/ipsec.h>
106 #include <netkey/key.h>
107 #endif
108
109 #ifdef FAST_IPSEC
110 #include <netipsec/ipsec.h>
111 #include <netipsec/key.h>
112 #define IPSEC
113 #endif
114
115 #include <net/net_osdep.h>
116
117 #ifdef HAVE_NRL_INPCB
118 /* inpcb members */
119 #define in6pcb inpcb
120 #define in6p_laddr inp_laddr6
121 #define in6p_faddr inp_faddr6
122 #define in6p_icmp6filt inp_icmp6filt
123 #define in6p_route inp_route
124 #define in6p_socket inp_socket
125 #define in6p_flags inp_flags
126 #define in6p_moptions inp_moptions6
127 #define in6p_outputopts inp_outputopts6
128 #define in6p_ip6 inp_ipv6
129 #define in6p_flowinfo inp_flowinfo
130 #define in6p_sp inp_sp
131 #define in6p_next inp_next
132 #define in6p_prev inp_prev
133 /* macro names */
134 #define sotoin6pcb sotoinpcb
135 /* function names */
136 #define in6_pcbdetach in_pcbdetach
137 #define in6_rtchange in_rtchange
138
139 /*
140 * for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from
141 * others...
142 */
143 #define in6p_ip6_nxt inp_ipv6.ip6_nxt
144 #endif
145
146 extern struct domain inet6domain;
147
148 struct icmp6stat icmp6stat;
149
150 extern struct inpcbhead ripcb;
151 extern int icmp6errppslim;
152 static int icmp6errpps_count = 0;
153 static struct timeval icmp6errppslim_last;
154 extern int icmp6_nodeinfo;
155
156 static void icmp6_errcount __P((struct icmp6errstat *, int, int));
157 static int icmp6_rip6_input __P((struct mbuf **, int));
158 static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int));
159 static const char *icmp6_redirect_diag __P((struct in6_addr *,
160 struct in6_addr *, struct in6_addr *));
161 #define HAVE_PPSRATECHECK
162 #ifndef HAVE_PPSRATECHECK
163 static int ppsratecheck __P((struct timeval *, int *, int));
164 #endif
165 static struct mbuf *ni6_input __P((struct mbuf *, int));
166 static struct mbuf *ni6_nametodns __P((const char *, int, int));
167 static int ni6_dnsmatch __P((const char *, int, const char *, int));
168 static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *,
169 struct ifnet **, char *));
170 static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
171 struct ifnet *, int));
172 static int icmp6_notify_error __P((struct mbuf *, int, int, int));
173
174 #ifdef COMPAT_RFC1885
175 static struct route_in6 icmp6_reflect_rt;
176 #endif
177
178
179 void
180 icmp6_init()
181 {
182 mld6_init();
183 }
184
185 static void
186 icmp6_errcount(stat, type, code)
187 struct icmp6errstat *stat;
188 int type, code;
189 {
190 switch (type) {
191 case ICMP6_DST_UNREACH:
192 switch (code) {
193 case ICMP6_DST_UNREACH_NOROUTE:
194 stat->icp6errs_dst_unreach_noroute++;
195 return;
196 case ICMP6_DST_UNREACH_ADMIN:
197 stat->icp6errs_dst_unreach_admin++;
198 return;
199 case ICMP6_DST_UNREACH_BEYONDSCOPE:
200 stat->icp6errs_dst_unreach_beyondscope++;
201 return;
202 case ICMP6_DST_UNREACH_ADDR:
203 stat->icp6errs_dst_unreach_addr++;
204 return;
205 case ICMP6_DST_UNREACH_NOPORT:
206 stat->icp6errs_dst_unreach_noport++;
207 return;
208 }
209 break;
210 case ICMP6_PACKET_TOO_BIG:
211 stat->icp6errs_packet_too_big++;
212 return;
213 case ICMP6_TIME_EXCEEDED:
214 switch (code) {
215 case ICMP6_TIME_EXCEED_TRANSIT:
216 stat->icp6errs_time_exceed_transit++;
217 return;
218 case ICMP6_TIME_EXCEED_REASSEMBLY:
219 stat->icp6errs_time_exceed_reassembly++;
220 return;
221 }
222 break;
223 case ICMP6_PARAM_PROB:
224 switch (code) {
225 case ICMP6_PARAMPROB_HEADER:
226 stat->icp6errs_paramprob_header++;
227 return;
228 case ICMP6_PARAMPROB_NEXTHEADER:
229 stat->icp6errs_paramprob_nextheader++;
230 return;
231 case ICMP6_PARAMPROB_OPTION:
232 stat->icp6errs_paramprob_option++;
233 return;
234 }
235 break;
236 case ND_REDIRECT:
237 stat->icp6errs_redirect++;
238 return;
239 }
240 stat->icp6errs_unknown++;
241 }
242
243 /*
244 * Generate an error packet of type error in response to bad IP6 packet.
245 */
246 void
247 icmp6_error(m, type, code, param)
248 struct mbuf *m;
249 int type, code, param;
250 {
251 struct ip6_hdr *oip6, *nip6;
252 struct icmp6_hdr *icmp6;
253 u_int preplen;
254 int off;
255 int nxt;
256
257 icmp6stat.icp6s_error++;
258
259 /* count per-type-code statistics */
260 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
261
262 #ifdef M_DECRYPTED /*not openbsd*/
263 if (m->m_flags & M_DECRYPTED) {
264 icmp6stat.icp6s_canterror++;
265 goto freeit;
266 }
267 #endif
268
269 #ifndef PULLDOWN_TEST
270 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
271 #else
272 if (m->m_len < sizeof(struct ip6_hdr)) {
273 m = m_pullup(m, sizeof(struct ip6_hdr));
274 if (m == NULL)
275 return;
276 }
277 #endif
278 oip6 = mtod(m, struct ip6_hdr *);
279
280 /*
281 * Multicast destination check. For unrecognized option errors,
282 * this check has already done in ip6_unknown_opt(), so we can
283 * check only for other errors.
284 */
285 if ((m->m_flags & (M_BCAST|M_MCAST) ||
286 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
287 (type != ICMP6_PACKET_TOO_BIG &&
288 (type != ICMP6_PARAM_PROB ||
289 code != ICMP6_PARAMPROB_OPTION)))
290 goto freeit;
291
292 /* Source address check. XXX: the case of anycast source? */
293 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
294 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
295 goto freeit;
296
297 /*
298 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
299 * don't do it.
300 */
301 nxt = -1;
302 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
303 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
304 struct icmp6_hdr *icp;
305
306 #ifndef PULLDOWN_TEST
307 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
308 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
309 #else
310 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
311 sizeof(*icp));
312 if (icp == NULL) {
313 icmp6stat.icp6s_tooshort++;
314 return;
315 }
316 #endif
317 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
318 icp->icmp6_type == ND_REDIRECT) {
319 /*
320 * ICMPv6 error
321 * Special case: for redirect (which is
322 * informational) we must not send icmp6 error.
323 */
324 icmp6stat.icp6s_canterror++;
325 goto freeit;
326 } else {
327 /* ICMPv6 informational - send the error */
328 }
329 } else {
330 /* non-ICMPv6 - send the error */
331 }
332
333 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
334
335 /* Finally, do rate limitation check. */
336 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
337 icmp6stat.icp6s_toofreq++;
338 goto freeit;
339 }
340
341 /*
342 * OK, ICMP6 can be generated.
343 */
344
345 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
346 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
347
348 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
349 M_PREPEND(m, preplen, M_DONTWAIT);
350 if (m && m->m_len < preplen)
351 m = m_pullup(m, preplen);
352 if (m == NULL) {
353 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
354 return;
355 }
356
357 nip6 = mtod(m, struct ip6_hdr *);
358 nip6->ip6_src = oip6->ip6_src;
359 nip6->ip6_dst = oip6->ip6_dst;
360
361 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
362 oip6->ip6_src.s6_addr16[1] = 0;
363 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
364 oip6->ip6_dst.s6_addr16[1] = 0;
365
366 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
367 icmp6->icmp6_type = type;
368 icmp6->icmp6_code = code;
369 icmp6->icmp6_pptr = htonl((u_int32_t)param);
370
371 /*
372 * icmp6_reflect() is designed to be in the input path.
373 * icmp6_error() can be called from both input and outut path,
374 * and if we are in output path rcvif could contain bogus value.
375 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
376 * information in ip header (nip6).
377 */
378 m->m_pkthdr.rcvif = NULL;
379
380 icmp6stat.icp6s_outhist[type]++;
381 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
382
383 return;
384
385 freeit:
386 /*
387 * If we can't tell wheter or not we can generate ICMP6, free it.
388 */
389 m_freem(m);
390 }
391
392 /*
393 * Process a received ICMP6 message.
394 */
395 int
396 icmp6_input(mp, offp, proto)
397 struct mbuf **mp;
398 int *offp, proto;
399 {
400 struct mbuf *m = *mp, *n;
401 struct ip6_hdr *ip6, *nip6;
402 struct icmp6_hdr *icmp6, *nicmp6;
403 int off = *offp;
404 int icmp6len = m->m_pkthdr.len - *offp;
405 int code, sum, noff;
406
407 #ifndef PULLDOWN_TEST
408 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
409 /* m might change if M_LOOP. So, call mtod after this */
410 #endif
411
412 /*
413 * Locate icmp6 structure in mbuf, and check
414 * that not corrupted and of at least minimum length
415 */
416
417 ip6 = mtod(m, struct ip6_hdr *);
418 if (icmp6len < sizeof(struct icmp6_hdr)) {
419 icmp6stat.icp6s_tooshort++;
420 goto freeit;
421 }
422
423 /*
424 * calculate the checksum
425 */
426 #ifndef PULLDOWN_TEST
427 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
428 #else
429 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
430 if (icmp6 == NULL) {
431 icmp6stat.icp6s_tooshort++;
432 return IPPROTO_DONE;
433 }
434 #endif
435 code = icmp6->icmp6_code;
436
437 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
438 nd6log((LOG_ERR,
439 "ICMP6 checksum error(%d|%x) %s\n",
440 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
441 icmp6stat.icp6s_checksum++;
442 goto freeit;
443 }
444
445 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
446 /*
447 * Deliver very specific ICMP6 type only.
448 * This is important to deilver TOOBIG. Otherwise PMTUD
449 * will not work.
450 */
451 switch (icmp6->icmp6_type) {
452 case ICMP6_DST_UNREACH:
453 case ICMP6_PACKET_TOO_BIG:
454 case ICMP6_TIME_EXCEEDED:
455 break;
456 default:
457 goto freeit;
458 }
459 }
460
461 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
462 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
463 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
464 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
465
466 switch (icmp6->icmp6_type) {
467 case ICMP6_DST_UNREACH:
468 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
469 switch (code) {
470 case ICMP6_DST_UNREACH_NOROUTE:
471 code = PRC_UNREACH_NET;
472 break;
473 case ICMP6_DST_UNREACH_ADMIN:
474 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
475 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
476 break;
477 case ICMP6_DST_UNREACH_ADDR:
478 code = PRC_HOSTDEAD;
479 break;
480 #ifdef COMPAT_RFC1885
481 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
482 code = PRC_UNREACH_SRCFAIL;
483 break;
484 #else
485 case ICMP6_DST_UNREACH_BEYONDSCOPE:
486 /* I mean "source address was incorrect." */
487 code = PRC_PARAMPROB;
488 break;
489 #endif
490 case ICMP6_DST_UNREACH_NOPORT:
491 code = PRC_UNREACH_PORT;
492 break;
493 default:
494 goto badcode;
495 }
496 goto deliver;
497 break;
498
499 case ICMP6_PACKET_TOO_BIG:
500 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
501 if (code != 0)
502 goto badcode;
503
504 code = PRC_MSGSIZE;
505
506 /*
507 * Updating the path MTU will be done after examining
508 * intermediate extension headers.
509 */
510 goto deliver;
511 break;
512
513 case ICMP6_TIME_EXCEEDED:
514 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
515 switch (code) {
516 case ICMP6_TIME_EXCEED_TRANSIT:
517 case ICMP6_TIME_EXCEED_REASSEMBLY:
518 code += PRC_TIMXCEED_INTRANS;
519 break;
520 default:
521 goto badcode;
522 }
523 goto deliver;
524 break;
525
526 case ICMP6_PARAM_PROB:
527 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
528 switch (code) {
529 case ICMP6_PARAMPROB_NEXTHEADER:
530 code = PRC_UNREACH_PROTOCOL;
531 break;
532 case ICMP6_PARAMPROB_HEADER:
533 case ICMP6_PARAMPROB_OPTION:
534 code = PRC_PARAMPROB;
535 break;
536 default:
537 goto badcode;
538 }
539 goto deliver;
540 break;
541
542 case ICMP6_ECHO_REQUEST:
543 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
544 if (code != 0)
545 goto badcode;
546 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
547 /* Give up remote */
548 break;
549 }
550 if ((n->m_flags & M_EXT) != 0
551 || n->m_len < off + sizeof(struct icmp6_hdr)) {
552 struct mbuf *n0 = n;
553 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
554 int n0len;
555
556 /*
557 * Prepare an internal mbuf. m_pullup() doesn't
558 * always copy the length we specified.
559 */
560 if (maxlen >= MCLBYTES) {
561 /* Give up remote */
562 m_freem(n0);
563 break;
564 }
565 MGETHDR(n, M_DONTWAIT, n0->m_type);
566 n0len = n0->m_pkthdr.len; /* save for use below */
567 if (n)
568 M_MOVE_PKTHDR(n, n0);
569 if (n && maxlen >= MHLEN) {
570 MCLGET(n, M_DONTWAIT);
571 if ((n->m_flags & M_EXT) == 0) {
572 m_free(n);
573 n = NULL;
574 }
575 }
576 if (n == NULL) {
577 /* Give up remote */
578 m_freem(n0);
579 break;
580 }
581 /*
582 * Copy IPv6 and ICMPv6 only.
583 */
584 nip6 = mtod(n, struct ip6_hdr *);
585 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
586 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
587 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
588 noff = sizeof(struct ip6_hdr);
589 /* new mbuf contains only ipv6+icmpv6 headers */
590 n->m_len = noff + sizeof(struct icmp6_hdr);
591 /*
592 * Adjust mbuf. ip6_plen will be adjusted in
593 * ip6_output().
594 */
595 m_adj(n0, off + sizeof(struct icmp6_hdr));
596 /* recalculate complete packet size */
597 n->m_pkthdr.len = n0len + (noff - off);
598 n->m_next = n0;
599 } else {
600 nip6 = mtod(n, struct ip6_hdr *);
601 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off);
602 noff = off;
603 }
604 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
605 nicmp6->icmp6_code = 0;
606 if (n) {
607 icmp6stat.icp6s_reflect++;
608 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
609 icmp6_reflect(n, noff);
610 }
611 break;
612
613 case ICMP6_ECHO_REPLY:
614 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
615 if (code != 0)
616 goto badcode;
617 break;
618
619 case MLD_LISTENER_QUERY:
620 case MLD_LISTENER_REPORT:
621 if (icmp6len < sizeof(struct mld_hdr))
622 goto badlen;
623 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
624 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
625 else
626 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
627 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
628 /* give up local */
629 mld6_input(m, off);
630 m = NULL;
631 goto freeit;
632 }
633 mld6_input(n, off);
634 /* m stays. */
635 break;
636
637 case MLD_LISTENER_DONE:
638 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
639 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
640 goto badlen;
641 break; /* nothing to be done in kernel */
642
643 case MLD_MTRACE_RESP:
644 case MLD_MTRACE:
645 /* XXX: these two are experimental. not officially defind. */
646 /* XXX: per-interface statistics? */
647 break; /* just pass it to applications */
648
649 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
650 {
651 enum { WRU, FQDN } mode;
652
653 if (!icmp6_nodeinfo)
654 break;
655
656 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
657 mode = WRU;
658 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
659 mode = FQDN;
660 else
661 goto badlen;
662
663 #define hostnamelen strlen(hostname)
664 if (mode == FQDN) {
665 #ifndef PULLDOWN_TEST
666 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
667 IPPROTO_DONE);
668 #endif
669 n = m_copy(m, 0, M_COPYALL);
670 if (n)
671 n = ni6_input(n, off);
672 /* XXX meaningless if n == NULL */
673 noff = sizeof(struct ip6_hdr);
674 } else {
675 u_char *p;
676 int maxlen, maxhlen;
677
678 if ((icmp6_nodeinfo & 5) != 5)
679 break;
680
681 if (code != 0)
682 goto badcode;
683 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
684 if (maxlen >= MCLBYTES) {
685 /* Give up remote */
686 break;
687 }
688 MGETHDR(n, M_DONTWAIT, m->m_type);
689 if (n && maxlen > MHLEN) {
690 MCLGET(n, M_DONTWAIT);
691 if ((n->m_flags & M_EXT) == 0) {
692 m_free(n);
693 n = NULL;
694 }
695 }
696 if (!m_dup_pkthdr(n, m, M_DONTWAIT)) {
697 /*
698 * Previous code did a blind M_COPY_PKTHDR
699 * and said "just for rcvif". If true, then
700 * we could tolerate the dup failing (due to
701 * the deep copy of the tag chain). For now
702 * be conservative and just fail.
703 */
704 m_free(n);
705 n = NULL;
706 }
707 if (n == NULL) {
708 /* Give up remote */
709 break;
710 }
711 n->m_pkthdr.rcvif = NULL;
712 n->m_len = 0;
713 maxhlen = M_TRAILINGSPACE(n) - maxlen;
714 if (maxhlen > hostnamelen)
715 maxhlen = hostnamelen;
716 /*
717 * Copy IPv6 and ICMPv6 only.
718 */
719 nip6 = mtod(n, struct ip6_hdr *);
720 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
721 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
722 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
723 p = (u_char *)(nicmp6 + 1);
724 bzero(p, 4);
725 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
726 noff = sizeof(struct ip6_hdr);
727 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
728 sizeof(struct icmp6_hdr) + 4 + maxhlen;
729 nicmp6->icmp6_type = ICMP6_WRUREPLY;
730 nicmp6->icmp6_code = 0;
731 }
732 #undef hostnamelen
733 if (n) {
734 icmp6stat.icp6s_reflect++;
735 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
736 icmp6_reflect(n, noff);
737 }
738 break;
739 }
740
741 case ICMP6_WRUREPLY:
742 if (code != 0)
743 goto badcode;
744 break;
745
746 case ND_ROUTER_SOLICIT:
747 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
748 if (code != 0)
749 goto badcode;
750 if (icmp6len < sizeof(struct nd_router_solicit))
751 goto badlen;
752 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
753 /* give up local */
754 nd6_rs_input(m, off, icmp6len);
755 m = NULL;
756 goto freeit;
757 }
758 nd6_rs_input(n, off, icmp6len);
759 /* m stays. */
760 break;
761
762 case ND_ROUTER_ADVERT:
763 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
764 if (code != 0)
765 goto badcode;
766 if (icmp6len < sizeof(struct nd_router_advert))
767 goto badlen;
768 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
769 /* give up local */
770 nd6_ra_input(m, off, icmp6len);
771 m = NULL;
772 goto freeit;
773 }
774 nd6_ra_input(n, off, icmp6len);
775 /* m stays. */
776 break;
777
778 case ND_NEIGHBOR_SOLICIT:
779 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
780 if (code != 0)
781 goto badcode;
782 if (icmp6len < sizeof(struct nd_neighbor_solicit))
783 goto badlen;
784 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
785 /* give up local */
786 nd6_ns_input(m, off, icmp6len);
787 m = NULL;
788 goto freeit;
789 }
790 nd6_ns_input(n, off, icmp6len);
791 /* m stays. */
792 break;
793
794 case ND_NEIGHBOR_ADVERT:
795 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
796 if (code != 0)
797 goto badcode;
798 if (icmp6len < sizeof(struct nd_neighbor_advert))
799 goto badlen;
800 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
801 /* give up local */
802 nd6_na_input(m, off, icmp6len);
803 m = NULL;
804 goto freeit;
805 }
806 nd6_na_input(n, off, icmp6len);
807 /* m stays. */
808 break;
809
810 case ND_REDIRECT:
811 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
812 if (code != 0)
813 goto badcode;
814 if (icmp6len < sizeof(struct nd_redirect))
815 goto badlen;
816 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
817 /* give up local */
818 icmp6_redirect_input(m, off);
819 m = NULL;
820 goto freeit;
821 }
822 icmp6_redirect_input(n, off);
823 /* m stays. */
824 break;
825
826 case ICMP6_ROUTER_RENUMBERING:
827 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
828 code != ICMP6_ROUTER_RENUMBERING_RESULT)
829 goto badcode;
830 if (icmp6len < sizeof(struct icmp6_router_renum))
831 goto badlen;
832 break;
833
834 default:
835 nd6log((LOG_DEBUG,
836 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
837 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
838 ip6_sprintf(&ip6->ip6_dst),
839 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
840 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
841 /* ICMPv6 error: MUST deliver it by spec... */
842 code = PRC_NCMDS;
843 /* deliver */
844 } else {
845 /* ICMPv6 informational: MUST not deliver */
846 break;
847 }
848 deliver:
849 if (icmp6_notify_error(m, off, icmp6len, code)) {
850 /* In this case, m should've been freed. */
851 return(IPPROTO_DONE);
852 }
853 break;
854
855 badcode:
856 icmp6stat.icp6s_badcode++;
857 break;
858
859 badlen:
860 icmp6stat.icp6s_badlen++;
861 break;
862 }
863
864 /* deliver the packet to appropriate sockets */
865 icmp6_rip6_input(&m, *offp);
866
867 return IPPROTO_DONE;
868
869 freeit:
870 m_freem(m);
871 return IPPROTO_DONE;
872 }
873
874 static int
875 icmp6_notify_error(m, off, icmp6len, code)
876 struct mbuf *m;
877 int off, icmp6len, code;
878 {
879 struct icmp6_hdr *icmp6;
880 struct ip6_hdr *eip6;
881 u_int32_t notifymtu;
882 struct sockaddr_in6 icmp6src, icmp6dst;
883
884 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
885 icmp6stat.icp6s_tooshort++;
886 goto freeit;
887 }
888 #ifndef PULLDOWN_TEST
889 IP6_EXTHDR_CHECK(m, off,
890 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
891 -1);
892 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
893 #else
894 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
895 sizeof(*icmp6) + sizeof(struct ip6_hdr));
896 if (icmp6 == NULL) {
897 icmp6stat.icp6s_tooshort++;
898 return(-1);
899 }
900 #endif
901 eip6 = (struct ip6_hdr *)(icmp6 + 1);
902
903 /* Detect the upper level protocol */
904 {
905 void (*ctlfunc) __P((int, struct sockaddr *, void *));
906 u_int8_t nxt = eip6->ip6_nxt;
907 int eoff = off + sizeof(struct icmp6_hdr) +
908 sizeof(struct ip6_hdr);
909 struct ip6ctlparam ip6cp;
910 struct in6_addr *finaldst = NULL;
911 int icmp6type = icmp6->icmp6_type;
912 struct ip6_frag *fh;
913 struct ip6_rthdr *rth;
914 struct ip6_rthdr0 *rth0;
915 int rthlen;
916
917 while (1) { /* XXX: should avoid infinite loop explicitly? */
918 struct ip6_ext *eh;
919
920 switch (nxt) {
921 case IPPROTO_HOPOPTS:
922 case IPPROTO_DSTOPTS:
923 case IPPROTO_AH:
924 #ifndef PULLDOWN_TEST
925 IP6_EXTHDR_CHECK(m, 0, eoff +
926 sizeof(struct ip6_ext),
927 -1);
928 eh = (struct ip6_ext *)(mtod(m, caddr_t)
929 + eoff);
930 #else
931 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
932 eoff, sizeof(*eh));
933 if (eh == NULL) {
934 icmp6stat.icp6s_tooshort++;
935 return(-1);
936 }
937 #endif
938
939 if (nxt == IPPROTO_AH)
940 eoff += (eh->ip6e_len + 2) << 2;
941 else
942 eoff += (eh->ip6e_len + 1) << 3;
943 nxt = eh->ip6e_nxt;
944 break;
945 case IPPROTO_ROUTING:
946 /*
947 * When the erroneous packet contains a
948 * routing header, we should examine the
949 * header to determine the final destination.
950 * Otherwise, we can't properly update
951 * information that depends on the final
952 * destination (e.g. path MTU).
953 */
954 #ifndef PULLDOWN_TEST
955 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
956 -1);
957 rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
958 + eoff);
959 #else
960 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
961 eoff, sizeof(*rth));
962 if (rth == NULL) {
963 icmp6stat.icp6s_tooshort++;
964 return(-1);
965 }
966 #endif
967 rthlen = (rth->ip6r_len + 1) << 3;
968 /*
969 * XXX: currently there is no
970 * officially defined type other
971 * than type-0.
972 * Note that if the segment left field
973 * is 0, all intermediate hops must
974 * have been passed.
975 */
976 if (rth->ip6r_segleft &&
977 rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
978 int hops;
979
980 #ifndef PULLDOWN_TEST
981 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen,
982 -1);
983 rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff);
984 #else
985 IP6_EXTHDR_GET(rth0,
986 struct ip6_rthdr0 *, m,
987 eoff, rthlen);
988 if (rth0 == NULL) {
989 icmp6stat.icp6s_tooshort++;
990 return(-1);
991 }
992 #endif
993 /* just ignore a bogus header */
994 if ((rth0->ip6r0_len % 2) == 0 &&
995 (hops = rth0->ip6r0_len/2))
996 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
997 }
998 eoff += rthlen;
999 nxt = rth->ip6r_nxt;
1000 break;
1001 case IPPROTO_FRAGMENT:
1002 #ifndef PULLDOWN_TEST
1003 IP6_EXTHDR_CHECK(m, 0, eoff +
1004 sizeof(struct ip6_frag),
1005 -1);
1006 fh = (struct ip6_frag *)(mtod(m, caddr_t)
1007 + eoff);
1008 #else
1009 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
1010 eoff, sizeof(*fh));
1011 if (fh == NULL) {
1012 icmp6stat.icp6s_tooshort++;
1013 return(-1);
1014 }
1015 #endif
1016 /*
1017 * Data after a fragment header is meaningless
1018 * unless it is the first fragment, but
1019 * we'll go to the notify label for path MTU
1020 * discovery.
1021 */
1022 if (fh->ip6f_offlg & IP6F_OFF_MASK)
1023 goto notify;
1024
1025 eoff += sizeof(struct ip6_frag);
1026 nxt = fh->ip6f_nxt;
1027 break;
1028 default:
1029 /*
1030 * This case includes ESP and the No Next
1031 * Header. In such cases going to the notify
1032 * label does not have any meaning
1033 * (i.e. ctlfunc will be NULL), but we go
1034 * anyway since we might have to update
1035 * path MTU information.
1036 */
1037 goto notify;
1038 }
1039 }
1040 notify:
1041 #ifndef PULLDOWN_TEST
1042 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1043 #else
1044 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1045 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1046 if (icmp6 == NULL) {
1047 icmp6stat.icp6s_tooshort++;
1048 return(-1);
1049 }
1050 #endif
1051
1052 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1053 bzero(&icmp6dst, sizeof(icmp6dst));
1054 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1055 icmp6dst.sin6_family = AF_INET6;
1056 if (finaldst == NULL)
1057 icmp6dst.sin6_addr = eip6->ip6_dst;
1058 else
1059 icmp6dst.sin6_addr = *finaldst;
1060 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1061 &icmp6dst.sin6_addr);
1062 #ifndef SCOPEDROUTING
1063 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst,
1064 NULL, NULL)) {
1065 /* should be impossbile */
1066 nd6log((LOG_DEBUG,
1067 "icmp6_notify_error: in6_embedscope failed\n"));
1068 goto freeit;
1069 }
1070 #endif
1071
1072 /*
1073 * retrieve parameters from the inner IPv6 header, and convert
1074 * them into sockaddr structures.
1075 */
1076 bzero(&icmp6src, sizeof(icmp6src));
1077 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1078 icmp6src.sin6_family = AF_INET6;
1079 icmp6src.sin6_addr = eip6->ip6_src;
1080 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1081 &icmp6src.sin6_addr);
1082 #ifndef SCOPEDROUTING
1083 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src,
1084 NULL, NULL)) {
1085 /* should be impossbile */
1086 nd6log((LOG_DEBUG,
1087 "icmp6_notify_error: in6_embedscope failed\n"));
1088 goto freeit;
1089 }
1090 #endif
1091 icmp6src.sin6_flowinfo =
1092 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1093
1094 if (finaldst == NULL)
1095 finaldst = &eip6->ip6_dst;
1096 ip6cp.ip6c_m = m;
1097 ip6cp.ip6c_icmp6 = icmp6;
1098 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1099 ip6cp.ip6c_off = eoff;
1100 ip6cp.ip6c_finaldst = finaldst;
1101 ip6cp.ip6c_src = &icmp6src;
1102 ip6cp.ip6c_nxt = nxt;
1103
1104 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1105 notifymtu = ntohl(icmp6->icmp6_mtu);
1106 ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
1107 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1108 }
1109
1110 ctlfunc = (void (*) __P((int, struct sockaddr *, void *)))
1111 (inet6sw[ip6_protox[nxt]].pr_ctlinput);
1112 if (ctlfunc) {
1113 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
1114 &ip6cp);
1115 }
1116 }
1117 return(0);
1118
1119 freeit:
1120 m_freem(m);
1121 return(-1);
1122 }
1123
1124 void
1125 icmp6_mtudisc_update(ip6cp, validated)
1126 struct ip6ctlparam *ip6cp;
1127 int validated;
1128 {
1129 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1130 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1131 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1132 u_int mtu = ntohl(icmp6->icmp6_mtu);
1133 struct rtentry *rt = NULL;
1134 struct sockaddr_in6 sin6;
1135
1136 if (!validated)
1137 return;
1138
1139 bzero(&sin6, sizeof(sin6));
1140 sin6.sin6_family = PF_INET6;
1141 sin6.sin6_len = sizeof(struct sockaddr_in6);
1142 sin6.sin6_addr = *dst;
1143 /* XXX normally, this won't happen */
1144 if (IN6_IS_ADDR_LINKLOCAL(dst)) {
1145 sin6.sin6_addr.s6_addr16[1] =
1146 htons(m->m_pkthdr.rcvif->if_index);
1147 }
1148 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
1149 rt = rtalloc1((struct sockaddr *)&sin6, 0,
1150 RTF_CLONING | RTF_PRCLONING);
1151
1152 if (rt && (rt->rt_flags & RTF_HOST)
1153 && !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
1154 if (mtu < IPV6_MMTU) {
1155 /* xxx */
1156 rt->rt_rmx.rmx_locks |= RTV_MTU;
1157 } else if (mtu < rt->rt_ifp->if_mtu &&
1158 rt->rt_rmx.rmx_mtu > mtu) {
1159 icmp6stat.icp6s_pmtuchg++;
1160 rt->rt_rmx.rmx_mtu = mtu;
1161 }
1162 }
1163 if (rt) { /* XXX: need braces to avoid conflict with else in RTFREE. */
1164 RTFREE(rt);
1165 }
1166 }
1167
1168 /*
1169 * Process a Node Information Query packet, based on
1170 * draft-ietf-ipngwg-icmp-name-lookups-07.
1171 *
1172 * Spec incompatibilities:
1173 * - IPv6 Subject address handling
1174 * - IPv4 Subject address handling support missing
1175 * - Proxy reply (answer even if it's not for me)
1176 * - joins NI group address at in6_ifattach() time only, does not cope
1177 * with hostname changes by sethostname(3)
1178 */
1179 #define hostnamelen strlen(hostname)
1180 static struct mbuf *
1181 ni6_input(m, off)
1182 struct mbuf *m;
1183 int off;
1184 {
1185 struct icmp6_nodeinfo *ni6, *nni6;
1186 struct mbuf *n = NULL;
1187 u_int16_t qtype;
1188 int subjlen;
1189 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1190 struct ni_reply_fqdn *fqdn;
1191 int addrs; /* for NI_QTYPE_NODEADDR */
1192 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1193 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
1194 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
1195 struct ip6_hdr *ip6;
1196 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1197 char *subj = NULL;
1198 struct in6_ifaddr *ia6 = NULL;
1199
1200 ip6 = mtod(m, struct ip6_hdr *);
1201 #ifndef PULLDOWN_TEST
1202 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1203 #else
1204 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1205 if (ni6 == NULL) {
1206 /* m is already reclaimed */
1207 return NULL;
1208 }
1209 #endif
1210
1211 /*
1212 * Validate IPv6 destination address.
1213 *
1214 * The Responder must discard the Query without further processing
1215 * unless it is one of the Responder's unicast or anycast addresses, or
1216 * a link-local scope multicast address which the Responder has joined.
1217 * [icmp-name-lookups-07, Section 4.]
1218 */
1219 bzero(&sin6, sizeof(sin6));
1220 sin6.sin6_family = AF_INET6;
1221 sin6.sin6_len = sizeof(struct sockaddr_in6);
1222 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
1223 /* XXX scopeid */
1224 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) {
1225 /* unicast/anycast, fine */
1226 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1227 (icmp6_nodeinfo & 4) == 0) {
1228 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1229 "a temporary address in %s:%d",
1230 __FILE__, __LINE__));
1231 goto bad;
1232 }
1233 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr))
1234 ; /* link-local multicast, fine */
1235 else
1236 goto bad;
1237
1238 /* validate query Subject field. */
1239 qtype = ntohs(ni6->ni_qtype);
1240 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1241 switch (qtype) {
1242 case NI_QTYPE_NOOP:
1243 case NI_QTYPE_SUPTYPES:
1244 /* 07 draft */
1245 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1246 break;
1247 /* FALLTHROUGH */
1248 case NI_QTYPE_FQDN:
1249 case NI_QTYPE_NODEADDR:
1250 switch (ni6->ni_code) {
1251 case ICMP6_NI_SUBJ_IPV6:
1252 #if ICMP6_NI_SUBJ_IPV6 != 0
1253 case 0:
1254 #endif
1255 /*
1256 * backward compatibility - try to accept 03 draft
1257 * format, where no Subject is present.
1258 */
1259 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1260 subjlen == 0) {
1261 oldfqdn++;
1262 break;
1263 }
1264 #if ICMP6_NI_SUBJ_IPV6 != 0
1265 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1266 goto bad;
1267 #endif
1268
1269 if (subjlen != sizeof(sin6.sin6_addr))
1270 goto bad;
1271
1272 /*
1273 * Validate Subject address.
1274 *
1275 * Not sure what exactly "address belongs to the node"
1276 * means in the spec, is it just unicast, or what?
1277 *
1278 * At this moment we consider Subject address as
1279 * "belong to the node" if the Subject address equals
1280 * to the IPv6 destination address; validation for
1281 * IPv6 destination address should have done enough
1282 * check for us.
1283 *
1284 * We do not do proxy at this moment.
1285 */
1286 /* m_pulldown instead of copy? */
1287 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1288 subjlen, (caddr_t)&sin6.sin6_addr);
1289 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1290 &sin6.sin6_addr);
1291 #ifndef SCOPEDROUTING
1292 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL);
1293 #endif
1294 bzero(&sin6_d, sizeof(sin6_d));
1295 sin6_d.sin6_family = AF_INET6; /* not used, actually */
1296 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */
1297 sin6_d.sin6_addr = ip6->ip6_dst;
1298 sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1299 &ip6->ip6_dst);
1300 #ifndef SCOPEDROUTING
1301 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL);
1302 #endif
1303 subj = (char *)&sin6;
1304 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
1305 break;
1306
1307 /*
1308 * XXX if we are to allow other cases, we should really
1309 * be careful about scope here.
1310 * basically, we should disallow queries toward IPv6
1311 * destination X with subject Y, if scope(X) > scope(Y).
1312 * if we allow scope(X) > scope(Y), it will result in
1313 * information leakage across scope boundary.
1314 */
1315 goto bad;
1316
1317 case ICMP6_NI_SUBJ_FQDN:
1318 /*
1319 * Validate Subject name with gethostname(3).
1320 *
1321 * The behavior may need some debate, since:
1322 * - we are not sure if the node has FQDN as
1323 * hostname (returned by gethostname(3)).
1324 * - the code does wildcard match for truncated names.
1325 * however, we are not sure if we want to perform
1326 * wildcard match, if gethostname(3) side has
1327 * truncated hostname.
1328 */
1329 n = ni6_nametodns(hostname, hostnamelen, 0);
1330 if (!n || n->m_next || n->m_len == 0)
1331 goto bad;
1332 IP6_EXTHDR_GET(subj, char *, m,
1333 off + sizeof(struct icmp6_nodeinfo), subjlen);
1334 if (subj == NULL)
1335 goto bad;
1336 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1337 n->m_len)) {
1338 goto bad;
1339 }
1340 m_freem(n);
1341 n = NULL;
1342 break;
1343
1344 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1345 default:
1346 goto bad;
1347 }
1348 break;
1349 }
1350
1351 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1352 switch (qtype) {
1353 case NI_QTYPE_FQDN:
1354 if ((icmp6_nodeinfo & 1) == 0)
1355 goto bad;
1356 break;
1357 case NI_QTYPE_NODEADDR:
1358 if ((icmp6_nodeinfo & 2) == 0)
1359 goto bad;
1360 break;
1361 }
1362
1363 /* guess reply length */
1364 switch (qtype) {
1365 case NI_QTYPE_NOOP:
1366 break; /* no reply data */
1367 case NI_QTYPE_SUPTYPES:
1368 replylen += sizeof(u_int32_t);
1369 break;
1370 case NI_QTYPE_FQDN:
1371 /* XXX will append an mbuf */
1372 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1373 break;
1374 case NI_QTYPE_NODEADDR:
1375 addrs = ni6_addrs(ni6, m, &ifp, subj);
1376 if ((replylen += addrs * (sizeof(struct in6_addr) +
1377 sizeof(u_int32_t))) > MCLBYTES)
1378 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1379 break;
1380 default:
1381 /*
1382 * XXX: We must return a reply with the ICMP6 code
1383 * `unknown Qtype' in this case. However we regard the case
1384 * as an FQDN query for backward compatibility.
1385 * Older versions set a random value to this field,
1386 * so it rarely varies in the defined qtypes.
1387 * But the mechanism is not reliable...
1388 * maybe we should obsolete older versions.
1389 */
1390 qtype = NI_QTYPE_FQDN;
1391 /* XXX will append an mbuf */
1392 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1393 oldfqdn++;
1394 break;
1395 }
1396
1397 /* allocate an mbuf to reply. */
1398 MGETHDR(n, M_DONTWAIT, m->m_type);
1399 if (n == NULL) {
1400 m_freem(m);
1401 return(NULL);
1402 }
1403 M_MOVE_PKTHDR(n, m); /* just for recvif */
1404 if (replylen > MHLEN) {
1405 if (replylen > MCLBYTES) {
1406 /*
1407 * XXX: should we try to allocate more? But MCLBYTES
1408 * is probably much larger than IPV6_MMTU...
1409 */
1410 goto bad;
1411 }
1412 MCLGET(n, M_DONTWAIT);
1413 if ((n->m_flags & M_EXT) == 0) {
1414 goto bad;
1415 }
1416 }
1417 n->m_pkthdr.len = n->m_len = replylen;
1418
1419 /* copy mbuf header and IPv6 + Node Information base headers */
1420 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1421 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1422 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1423
1424 /* qtype dependent procedure */
1425 switch (qtype) {
1426 case NI_QTYPE_NOOP:
1427 nni6->ni_code = ICMP6_NI_SUCCESS;
1428 nni6->ni_flags = 0;
1429 break;
1430 case NI_QTYPE_SUPTYPES:
1431 {
1432 u_int32_t v;
1433 nni6->ni_code = ICMP6_NI_SUCCESS;
1434 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1435 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1436 v = (u_int32_t)htonl(0x0000000f);
1437 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1438 break;
1439 }
1440 case NI_QTYPE_FQDN:
1441 nni6->ni_code = ICMP6_NI_SUCCESS;
1442 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1443 sizeof(struct ip6_hdr) +
1444 sizeof(struct icmp6_nodeinfo));
1445 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1446 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1447 /*
1448 * XXX do we really have FQDN in variable "hostname"?
1449 */
1450 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1451 if (n->m_next == NULL)
1452 goto bad;
1453 /* XXX we assume that n->m_next is not a chain */
1454 if (n->m_next->m_next != NULL)
1455 goto bad;
1456 n->m_pkthdr.len += n->m_next->m_len;
1457 break;
1458 case NI_QTYPE_NODEADDR:
1459 {
1460 int lenlim, copied;
1461
1462 nni6->ni_code = ICMP6_NI_SUCCESS;
1463 n->m_pkthdr.len = n->m_len =
1464 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1465 lenlim = M_TRAILINGSPACE(n);
1466 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1467 /* XXX: reset mbuf length */
1468 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1469 sizeof(struct icmp6_nodeinfo) + copied;
1470 break;
1471 }
1472 default:
1473 break; /* XXX impossible! */
1474 }
1475
1476 nni6->ni_type = ICMP6_NI_REPLY;
1477 m_freem(m);
1478 return(n);
1479
1480 bad:
1481 m_freem(m);
1482 if (n)
1483 m_freem(n);
1484 return(NULL);
1485 }
1486 #undef hostnamelen
1487
1488 /*
1489 * make a mbuf with DNS-encoded string. no compression support.
1490 *
1491 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1492 * treated as truncated name (two \0 at the end). this is a wild guess.
1493 */
1494 static struct mbuf *
1495 ni6_nametodns(name, namelen, old)
1496 const char *name;
1497 int namelen;
1498 int old; /* return pascal string if non-zero */
1499 {
1500 struct mbuf *m;
1501 char *cp, *ep;
1502 const char *p, *q;
1503 int i, len, nterm;
1504
1505 if (old)
1506 len = namelen + 1;
1507 else
1508 len = MCLBYTES;
1509
1510 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1511 MGET(m, M_DONTWAIT, MT_DATA);
1512 if (m && len > MLEN) {
1513 MCLGET(m, M_DONTWAIT);
1514 if ((m->m_flags & M_EXT) == 0)
1515 goto fail;
1516 }
1517 if (!m)
1518 goto fail;
1519 m->m_next = NULL;
1520
1521 if (old) {
1522 m->m_len = len;
1523 *mtod(m, char *) = namelen;
1524 bcopy(name, mtod(m, char *) + 1, namelen);
1525 return m;
1526 } else {
1527 m->m_len = 0;
1528 cp = mtod(m, char *);
1529 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1530
1531 /* if not certain about my name, return empty buffer */
1532 if (namelen == 0)
1533 return m;
1534
1535 /*
1536 * guess if it looks like shortened hostname, or FQDN.
1537 * shortened hostname needs two trailing "\0".
1538 */
1539 i = 0;
1540 for (p = name; p < name + namelen; p++) {
1541 if (*p && *p == '.')
1542 i++;
1543 }
1544 if (i < 2)
1545 nterm = 2;
1546 else
1547 nterm = 1;
1548
1549 p = name;
1550 while (cp < ep && p < name + namelen) {
1551 i = 0;
1552 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1553 i++;
1554 /* result does not fit into mbuf */
1555 if (cp + i + 1 >= ep)
1556 goto fail;
1557 /*
1558 * DNS label length restriction, RFC1035 page 8.
1559 * "i == 0" case is included here to avoid returning
1560 * 0-length label on "foo..bar".
1561 */
1562 if (i <= 0 || i >= 64)
1563 goto fail;
1564 *cp++ = i;
1565 bcopy(p, cp, i);
1566 cp += i;
1567 p = q;
1568 if (p < name + namelen && *p == '.')
1569 p++;
1570 }
1571 /* termination */
1572 if (cp + nterm >= ep)
1573 goto fail;
1574 while (nterm-- > 0)
1575 *cp++ = '\0';
1576 m->m_len = cp - mtod(m, char *);
1577 return m;
1578 }
1579
1580 panic("should not reach here");
1581 /* NOTREACHED */
1582
1583 fail:
1584 if (m)
1585 m_freem(m);
1586 return NULL;
1587 }
1588
1589 /*
1590 * check if two DNS-encoded string matches. takes care of truncated
1591 * form (with \0\0 at the end). no compression support.
1592 * XXX upper/lowercase match (see RFC2065)
1593 */
1594 static int
1595 ni6_dnsmatch(a, alen, b, blen)
1596 const char *a;
1597 int alen;
1598 const char *b;
1599 int blen;
1600 {
1601 const char *a0, *b0;
1602 int l;
1603
1604 /* simplest case - need validation? */
1605 if (alen == blen && bcmp(a, b, alen) == 0)
1606 return 1;
1607
1608 a0 = a;
1609 b0 = b;
1610
1611 /* termination is mandatory */
1612 if (alen < 2 || blen < 2)
1613 return 0;
1614 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1615 return 0;
1616 alen--;
1617 blen--;
1618
1619 while (a - a0 < alen && b - b0 < blen) {
1620 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1621 return 0;
1622
1623 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1624 return 0;
1625 /* we don't support compression yet */
1626 if (a[0] >= 64 || b[0] >= 64)
1627 return 0;
1628
1629 /* truncated case */
1630 if (a[0] == 0 && a - a0 == alen - 1)
1631 return 1;
1632 if (b[0] == 0 && b - b0 == blen - 1)
1633 return 1;
1634 if (a[0] == 0 || b[0] == 0)
1635 return 0;
1636
1637 if (a[0] != b[0])
1638 return 0;
1639 l = a[0];
1640 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1641 return 0;
1642 if (bcmp(a + 1, b + 1, l) != 0)
1643 return 0;
1644
1645 a += 1 + l;
1646 b += 1 + l;
1647 }
1648
1649 if (a - a0 == alen && b - b0 == blen)
1650 return 1;
1651 else
1652 return 0;
1653 }
1654
1655 /*
1656 * calculate the number of addresses to be returned in the node info reply.
1657 */
1658 static int
1659 ni6_addrs(ni6, m, ifpp, subj)
1660 struct icmp6_nodeinfo *ni6;
1661 struct mbuf *m;
1662 struct ifnet **ifpp;
1663 char *subj;
1664 {
1665 struct ifnet *ifp;
1666 struct in6_ifaddr *ifa6;
1667 struct ifaddr *ifa;
1668 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
1669 int addrs = 0, addrsofif, iffound = 0;
1670 int niflags = ni6->ni_flags;
1671
1672 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1673 switch (ni6->ni_code) {
1674 case ICMP6_NI_SUBJ_IPV6:
1675 if (subj == NULL) /* must be impossible... */
1676 return(0);
1677 subj_ip6 = (struct sockaddr_in6 *)subj;
1678 break;
1679 default:
1680 /*
1681 * XXX: we only support IPv6 subject address for
1682 * this Qtype.
1683 */
1684 return(0);
1685 }
1686 }
1687
1688 IFNET_RLOCK();
1689 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
1690 {
1691 addrsofif = 0;
1692 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1693 {
1694 if (ifa->ifa_addr->sa_family != AF_INET6)
1695 continue;
1696 ifa6 = (struct in6_ifaddr *)ifa;
1697
1698 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1699 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
1700 &ifa6->ia_addr.sin6_addr))
1701 iffound = 1;
1702
1703 /*
1704 * IPv4-mapped addresses can only be returned by a
1705 * Node Information proxy, since they represent
1706 * addresses of IPv4-only nodes, which perforce do
1707 * not implement this protocol.
1708 * [icmp-name-lookups-07, Section 5.4]
1709 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1710 * this function at this moment.
1711 */
1712
1713 /* What do we have to do about ::1? */
1714 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1715 case IPV6_ADDR_SCOPE_LINKLOCAL:
1716 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1717 continue;
1718 break;
1719 case IPV6_ADDR_SCOPE_SITELOCAL:
1720 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1721 continue;
1722 break;
1723 case IPV6_ADDR_SCOPE_GLOBAL:
1724 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1725 continue;
1726 break;
1727 default:
1728 continue;
1729 }
1730
1731 /*
1732 * check if anycast is okay.
1733 * XXX: just experimental. not in the spec.
1734 */
1735 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1736 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1737 continue; /* we need only unicast addresses */
1738 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1739 (icmp6_nodeinfo & 4) == 0) {
1740 continue;
1741 }
1742 addrsofif++; /* count the address */
1743 }
1744 if (iffound) {
1745 *ifpp = ifp;
1746 IFNET_RUNLOCK();
1747 return(addrsofif);
1748 }
1749
1750 addrs += addrsofif;
1751 }
1752 IFNET_RUNLOCK();
1753
1754 return(addrs);
1755 }
1756
1757 static int
1758 ni6_store_addrs(ni6, nni6, ifp0, resid)
1759 struct icmp6_nodeinfo *ni6, *nni6;
1760 struct ifnet *ifp0;
1761 int resid;
1762 {
1763 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet);
1764 struct in6_ifaddr *ifa6;
1765 struct ifaddr *ifa;
1766 struct ifnet *ifp_dep = NULL;
1767 int copied = 0, allow_deprecated = 0;
1768 u_char *cp = (u_char *)(nni6 + 1);
1769 int niflags = ni6->ni_flags;
1770 u_int32_t ltime;
1771
1772 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1773 return(0); /* needless to copy */
1774
1775 IFNET_RLOCK();
1776 again:
1777 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list))
1778 {
1779 for (ifa = ifp->if_addrlist.tqh_first; ifa;
1780 ifa = ifa->ifa_list.tqe_next)
1781 {
1782 if (ifa->ifa_addr->sa_family != AF_INET6)
1783 continue;
1784 ifa6 = (struct in6_ifaddr *)ifa;
1785
1786 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
1787 allow_deprecated == 0) {
1788 /*
1789 * prefererred address should be put before
1790 * deprecated addresses.
1791 */
1792
1793 /* record the interface for later search */
1794 if (ifp_dep == NULL)
1795 ifp_dep = ifp;
1796
1797 continue;
1798 }
1799 else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
1800 allow_deprecated != 0)
1801 continue; /* we now collect deprecated addrs */
1802
1803 /* What do we have to do about ::1? */
1804 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1805 case IPV6_ADDR_SCOPE_LINKLOCAL:
1806 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1807 continue;
1808 break;
1809 case IPV6_ADDR_SCOPE_SITELOCAL:
1810 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1811 continue;
1812 break;
1813 case IPV6_ADDR_SCOPE_GLOBAL:
1814 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1815 continue;
1816 break;
1817 default:
1818 continue;
1819 }
1820
1821 /*
1822 * check if anycast is okay.
1823 * XXX: just experimental. not in the spec.
1824 */
1825 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1826 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1827 continue;
1828 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1829 (icmp6_nodeinfo & 4) == 0) {
1830 continue;
1831 }
1832
1833 /* now we can copy the address */
1834 if (resid < sizeof(struct in6_addr) +
1835 sizeof(u_int32_t)) {
1836 /*
1837 * We give up much more copy.
1838 * Set the truncate flag and return.
1839 */
1840 nni6->ni_flags |=
1841 NI_NODEADDR_FLAG_TRUNCATE;
1842 IFNET_RUNLOCK();
1843 return(copied);
1844 }
1845
1846 /*
1847 * Set the TTL of the address.
1848 * The TTL value should be one of the following
1849 * according to the specification:
1850 *
1851 * 1. The remaining lifetime of a DHCP lease on the
1852 * address, or
1853 * 2. The remaining Valid Lifetime of a prefix from
1854 * which the address was derived through Stateless
1855 * Autoconfiguration.
1856 *
1857 * Note that we currently do not support stateful
1858 * address configuration by DHCPv6, so the former
1859 * case can't happen.
1860 */
1861 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1862 ltime = ND6_INFINITE_LIFETIME;
1863 else {
1864 if (ifa6->ia6_lifetime.ia6t_expire >
1865 time_second)
1866 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second);
1867 else
1868 ltime = 0;
1869 }
1870
1871 bcopy(<ime, cp, sizeof(u_int32_t));
1872 cp += sizeof(u_int32_t);
1873
1874 /* copy the address itself */
1875 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1876 sizeof(struct in6_addr));
1877 /* XXX: KAME link-local hack; remove ifindex */
1878 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr))
1879 ((struct in6_addr *)cp)->s6_addr16[1] = 0;
1880 cp += sizeof(struct in6_addr);
1881
1882 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1883 copied += (sizeof(struct in6_addr) +
1884 sizeof(u_int32_t));
1885 }
1886 if (ifp0) /* we need search only on the specified IF */
1887 break;
1888 }
1889
1890 if (allow_deprecated == 0 && ifp_dep != NULL) {
1891 ifp = ifp_dep;
1892 allow_deprecated = 1;
1893
1894 goto again;
1895 }
1896
1897 IFNET_RUNLOCK();
1898
1899 return(copied);
1900 }
1901
1902 /*
1903 * XXX almost dup'ed code with rip6_input.
1904 */
1905 static int
1906 icmp6_rip6_input(mp, off)
1907 struct mbuf **mp;
1908 int off;
1909 {
1910 struct mbuf *m = *mp;
1911 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1912 struct in6pcb *in6p;
1913 struct in6pcb *last = NULL;
1914 struct sockaddr_in6 rip6src;
1915 struct icmp6_hdr *icmp6;
1916 struct mbuf *opts = NULL;
1917
1918 #ifndef PULLDOWN_TEST
1919 /* this is assumed to be safe. */
1920 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1921 #else
1922 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1923 if (icmp6 == NULL) {
1924 /* m is already reclaimed */
1925 return IPPROTO_DONE;
1926 }
1927 #endif
1928
1929 bzero(&rip6src, sizeof(rip6src));
1930 rip6src.sin6_len = sizeof(struct sockaddr_in6);
1931 rip6src.sin6_family = AF_INET6;
1932 /* KAME hack: recover scopeid */
1933 (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1934
1935 LIST_FOREACH(in6p, &ripcb, inp_list)
1936 {
1937 if ((in6p->inp_vflag & INP_IPV6) == 0)
1938 continue;
1939 #ifdef HAVE_NRL_INPCB
1940 if (!(in6p->in6p_flags & INP_IPV6))
1941 continue;
1942 #endif
1943 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
1944 continue;
1945 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1946 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1947 continue;
1948 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1949 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1950 continue;
1951 if (in6p->in6p_icmp6filt
1952 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1953 in6p->in6p_icmp6filt))
1954 continue;
1955 if (last) {
1956 struct mbuf *n;
1957 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1958 if (last->in6p_flags & IN6P_CONTROLOPTS)
1959 ip6_savecontrol(last, &opts, ip6, n);
1960 /* strip intermediate headers */
1961 m_adj(n, off);
1962 if (sbappendaddr(&last->in6p_socket->so_rcv,
1963 (struct sockaddr *)&rip6src,
1964 n, opts) == 0) {
1965 /* should notify about lost packet */
1966 m_freem(n);
1967 if (opts) {
1968 m_freem(opts);
1969 }
1970 } else
1971 sorwakeup(last->in6p_socket);
1972 opts = NULL;
1973 }
1974 }
1975 last = in6p;
1976 }
1977 if (last) {
1978 if (last->in6p_flags & IN6P_CONTROLOPTS)
1979 ip6_savecontrol(last, &opts, ip6, m);
1980 /* strip intermediate headers */
1981 m_adj(m, off);
1982 if (sbappendaddr(&last->in6p_socket->so_rcv,
1983 (struct sockaddr *)&rip6src, m, opts) == 0) {
1984 m_freem(m);
1985 if (opts)
1986 m_freem(opts);
1987 } else
1988 sorwakeup(last->in6p_socket);
1989 } else {
1990 m_freem(m);
1991 ip6stat.ip6s_delivered--;
1992 }
1993 return IPPROTO_DONE;
1994 }
1995
1996 /*
1997 * Reflect the ip6 packet back to the source.
1998 * OFF points to the icmp6 header, counted from the top of the mbuf.
1999 */
2000 void
2001 icmp6_reflect(m, off)
2002 struct mbuf *m;
2003 size_t off;
2004 {
2005 struct ip6_hdr *ip6;
2006 struct icmp6_hdr *icmp6;
2007 struct in6_ifaddr *ia;
2008 struct in6_addr t, *src = 0;
2009 int plen;
2010 int type, code;
2011 struct ifnet *outif = NULL;
2012 struct sockaddr_in6 sa6_src, sa6_dst;
2013 #ifdef COMPAT_RFC1885
2014 int mtu = IPV6_MMTU;
2015 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst;
2016 #endif
2017
2018 /* too short to reflect */
2019 if (off < sizeof(struct ip6_hdr)) {
2020 nd6log((LOG_DEBUG,
2021 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2022 (u_long)off, (u_long)sizeof(struct ip6_hdr),
2023 __FILE__, __LINE__));
2024 goto bad;
2025 }
2026
2027 /*
2028 * If there are extra headers between IPv6 and ICMPv6, strip
2029 * off that header first.
2030 */
2031 #ifdef DIAGNOSTIC
2032 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
2033 panic("assumption failed in icmp6_reflect");
2034 #endif
2035 if (off > sizeof(struct ip6_hdr)) {
2036 size_t l;
2037 struct ip6_hdr nip6;
2038
2039 l = off - sizeof(struct ip6_hdr);
2040 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2041 m_adj(m, l);
2042 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2043 if (m->m_len < l) {
2044 if ((m = m_pullup(m, l)) == NULL)
2045 return;
2046 }
2047 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2048 } else /* off == sizeof(struct ip6_hdr) */ {
2049 size_t l;
2050 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2051 if (m->m_len < l) {
2052 if ((m = m_pullup(m, l)) == NULL)
2053 return;
2054 }
2055 }
2056 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
2057 ip6 = mtod(m, struct ip6_hdr *);
2058 ip6->ip6_nxt = IPPROTO_ICMPV6;
2059 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
2060 type = icmp6->icmp6_type; /* keep type for statistics */
2061 code = icmp6->icmp6_code; /* ditto. */
2062
2063 t = ip6->ip6_dst;
2064 /*
2065 * ip6_input() drops a packet if its src is multicast.
2066 * So, the src is never multicast.
2067 */
2068 ip6->ip6_dst = ip6->ip6_src;
2069
2070 /*
2071 * XXX: make sure to embed scope zone information, using
2072 * already embedded IDs or the received interface (if any).
2073 * Note that rcvif may be NULL.
2074 * TODO: scoped routing case (XXX).
2075 */
2076 bzero(&sa6_src, sizeof(sa6_src));
2077 sa6_src.sin6_family = AF_INET6;
2078 sa6_src.sin6_len = sizeof(sa6_src);
2079 sa6_src.sin6_addr = ip6->ip6_dst;
2080 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
2081 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL);
2082 bzero(&sa6_dst, sizeof(sa6_dst));
2083 sa6_dst.sin6_family = AF_INET6;
2084 sa6_dst.sin6_len = sizeof(sa6_dst);
2085 sa6_dst.sin6_addr = t;
2086 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
2087 in6_embedscope(&t, &sa6_dst, NULL, NULL);
2088
2089 #ifdef COMPAT_RFC1885
2090 /*
2091 * xxx guess MTU
2092 * RFC 1885 requires that echo reply should be truncated if it
2093 * does not fit in with (return) path MTU, but the description was
2094 * removed in the new spec.
2095 */
2096 if (icmp6_reflect_rt.ro_rt == 0 ||
2097 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) {
2098 if (icmp6_reflect_rt.ro_rt) {
2099 RTFREE(icmp6_reflect_rt.ro_rt);
2100 icmp6_reflect_rt.ro_rt = 0;
2101 }
2102 bzero(sin6, sizeof(*sin6));
2103 sin6->sin6_family = PF_INET6;
2104 sin6->sin6_len = sizeof(struct sockaddr_in6);
2105 sin6->sin6_addr = ip6->ip6_dst;
2106
2107 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt,
2108 RTF_PRCLONING);
2109 }
2110
2111 if (icmp6_reflect_rt.ro_rt == 0)
2112 goto bad;
2113
2114 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST)
2115 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu)
2116 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu;
2117
2118 if (mtu < m->m_pkthdr.len) {
2119 plen -= (m->m_pkthdr.len - mtu);
2120 m_adj(m, mtu - m->m_pkthdr.len);
2121 }
2122 #endif
2123 /*
2124 * If the incoming packet was addressed directly to us(i.e. unicast),
2125 * use dst as the src for the reply.
2126 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible
2127 * (for example) when we encounter an error while forwarding procedure
2128 * destined to a duplicated address of ours.
2129 */
2130 for (ia = in6_ifaddr; ia; ia = ia->ia_next)
2131 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
2132 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2133 src = &t;
2134 break;
2135 }
2136 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
2137 /*
2138 * This is the case if the dst is our link-local address
2139 * and the sender is also ourselves.
2140 */
2141 src = &t;
2142 }
2143
2144 if (src == 0) {
2145 int e;
2146 struct route_in6 ro;
2147
2148 /*
2149 * This case matches to multicasts, our anycast, or unicasts
2150 * that we do not own. Select a source address based on the
2151 * source address of the erroneous packet.
2152 */
2153 bzero(&ro, sizeof(ro));
2154 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e);
2155 if (ro.ro_rt)
2156 RTFREE(ro.ro_rt); /* XXX: we could use this */
2157 if (src == NULL) {
2158 nd6log((LOG_DEBUG,
2159 "icmp6_reflect: source can't be determined: "
2160 "dst=%s, error=%d\n",
2161 ip6_sprintf(&sa6_src.sin6_addr), e));
2162 goto bad;
2163 }
2164 }
2165
2166 ip6->ip6_src = *src;
2167
2168 ip6->ip6_flow = 0;
2169 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2170 ip6->ip6_vfc |= IPV6_VERSION;
2171 ip6->ip6_nxt = IPPROTO_ICMPV6;
2172 if (m->m_pkthdr.rcvif) {
2173 /* XXX: This may not be the outgoing interface */
2174 ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim;
2175 } else
2176 ip6->ip6_hlim = ip6_defhlim;
2177
2178 icmp6->icmp6_cksum = 0;
2179 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2180 sizeof(struct ip6_hdr), plen);
2181
2182 /*
2183 * XXX option handling
2184 */
2185
2186 m->m_flags &= ~(M_BCAST|M_MCAST);
2187
2188 #ifdef COMPAT_RFC1885
2189 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL);
2190 #else
2191 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2192 #endif
2193 if (outif)
2194 icmp6_ifoutstat_inc(outif, type, code);
2195
2196 return;
2197
2198 bad:
2199 m_freem(m);
2200 return;
2201 }
2202
2203 void
2204 icmp6_fasttimo()
2205 {
2206
2207 mld6_fasttimeo();
2208 }
2209
2210 static const char *
2211 icmp6_redirect_diag(src6, dst6, tgt6)
2212 struct in6_addr *src6;
2213 struct in6_addr *dst6;
2214 struct in6_addr *tgt6;
2215 {
2216 static char buf[1024];
2217 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2218 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
2219 return buf;
2220 }
2221
2222 void
2223 icmp6_redirect_input(m, off)
2224 struct mbuf *m;
2225 int off;
2226 {
2227 struct ifnet *ifp = m->m_pkthdr.rcvif;
2228 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2229 struct nd_redirect *nd_rd;
2230 int icmp6len = ntohs(ip6->ip6_plen);
2231 char *lladdr = NULL;
2232 int lladdrlen = 0;
2233 u_char *redirhdr = NULL;
2234 int redirhdrlen = 0;
2235 struct rtentry *rt = NULL;
2236 int is_router;
2237 int is_onlink;
2238 struct in6_addr src6 = ip6->ip6_src;
2239 struct in6_addr redtgt6;
2240 struct in6_addr reddst6;
2241 union nd_opts ndopts;
2242
2243 if (!m || !ifp)
2244 return;
2245
2246 /* XXX if we are router, we don't update route by icmp6 redirect */
2247 if (ip6_forwarding)
2248 goto freeit;
2249 if (!icmp6_rediraccept)
2250 goto freeit;
2251
2252 #ifndef PULLDOWN_TEST
2253 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2254 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2255 #else
2256 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2257 if (nd_rd == NULL) {
2258 icmp6stat.icp6s_tooshort++;
2259 return;
2260 }
2261 #endif
2262 redtgt6 = nd_rd->nd_rd_target;
2263 reddst6 = nd_rd->nd_rd_dst;
2264
2265 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2266 redtgt6.s6_addr16[1] = htons(ifp->if_index);
2267 if (IN6_IS_ADDR_LINKLOCAL(&reddst6))
2268 reddst6.s6_addr16[1] = htons(ifp->if_index);
2269
2270 /* validation */
2271 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2272 nd6log((LOG_ERR,
2273 "ICMP6 redirect sent from %s rejected; "
2274 "must be from linklocal\n", ip6_sprintf(&src6)));
2275 goto bad;
2276 }
2277 if (ip6->ip6_hlim != 255) {
2278 nd6log((LOG_ERR,
2279 "ICMP6 redirect sent from %s rejected; "
2280 "hlim=%d (must be 255)\n",
2281 ip6_sprintf(&src6), ip6->ip6_hlim));
2282 goto bad;
2283 }
2284 {
2285 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2286 struct sockaddr_in6 sin6;
2287 struct in6_addr *gw6;
2288
2289 bzero(&sin6, sizeof(sin6));
2290 sin6.sin6_family = AF_INET6;
2291 sin6.sin6_len = sizeof(struct sockaddr_in6);
2292 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
2293 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
2294 if (rt) {
2295 if (rt->rt_gateway == NULL ||
2296 rt->rt_gateway->sa_family != AF_INET6) {
2297 nd6log((LOG_ERR,
2298 "ICMP6 redirect rejected; no route "
2299 "with inet6 gateway found for redirect dst: %s\n",
2300 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2301 RTFREE(rt);
2302 goto bad;
2303 }
2304
2305 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2306 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2307 nd6log((LOG_ERR,
2308 "ICMP6 redirect rejected; "
2309 "not equal to gw-for-src=%s (must be same): "
2310 "%s\n",
2311 ip6_sprintf(gw6),
2312 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2313 RTFREE(rt);
2314 goto bad;
2315 }
2316 } else {
2317 nd6log((LOG_ERR,
2318 "ICMP6 redirect rejected; "
2319 "no route found for redirect dst: %s\n",
2320 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2321 goto bad;
2322 }
2323 RTFREE(rt);
2324 rt = NULL;
2325 }
2326 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2327 nd6log((LOG_ERR,
2328 "ICMP6 redirect rejected; "
2329 "redirect dst must be unicast: %s\n",
2330 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2331 goto bad;
2332 }
2333
2334 is_router = is_onlink = 0;
2335 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2336 is_router = 1; /* router case */
2337 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2338 is_onlink = 1; /* on-link destination case */
2339 if (!is_router && !is_onlink) {
2340 nd6log((LOG_ERR,
2341 "ICMP6 redirect rejected; "
2342 "neither router case nor onlink case: %s\n",
2343 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2344 goto bad;
2345 }
2346 /* validation passed */
2347
2348 icmp6len -= sizeof(*nd_rd);
2349 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2350 if (nd6_options(&ndopts) < 0) {
2351 nd6log((LOG_INFO, "icmp6_redirect_input: "
2352 "invalid ND option, rejected: %s\n",
2353 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2354 /* nd6_options have incremented stats */
2355 goto freeit;
2356 }
2357
2358 if (ndopts.nd_opts_tgt_lladdr) {
2359 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2360 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2361 }
2362
2363 if (ndopts.nd_opts_rh) {
2364 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2365 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2366 }
2367
2368 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2369 nd6log((LOG_INFO,
2370 "icmp6_redirect_input: lladdrlen mismatch for %s "
2371 "(if %d, icmp6 packet %d): %s\n",
2372 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
2373 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2374 goto bad;
2375 }
2376
2377 /* RFC 2461 8.3 */
2378 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2379 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2380
2381 if (!is_onlink) { /* better router case. perform rtredirect. */
2382 /* perform rtredirect */
2383 struct sockaddr_in6 sdst;
2384 struct sockaddr_in6 sgw;
2385 struct sockaddr_in6 ssrc;
2386
2387 bzero(&sdst, sizeof(sdst));
2388 bzero(&sgw, sizeof(sgw));
2389 bzero(&ssrc, sizeof(ssrc));
2390 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2391 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2392 sizeof(struct sockaddr_in6);
2393 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2394 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2395 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2396 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
2397 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST,
2398 (struct sockaddr *)&ssrc,
2399 (struct rtentry **)NULL);
2400 }
2401 /* finally update cached route in each socket via pfctlinput */
2402 {
2403 struct sockaddr_in6 sdst;
2404
2405 bzero(&sdst, sizeof(sdst));
2406 sdst.sin6_family = AF_INET6;
2407 sdst.sin6_len = sizeof(struct sockaddr_in6);
2408 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2409 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2410 #ifdef IPSEC
2411 key_sa_routechange((struct sockaddr *)&sdst);
2412 #endif
2413 }
2414
2415 freeit:
2416 m_freem(m);
2417 return;
2418
2419 bad:
2420 icmp6stat.icp6s_badredirect++;
2421 m_freem(m);
2422 }
2423
2424 void
2425 icmp6_redirect_output(m0, rt)
2426 struct mbuf *m0;
2427 struct rtentry *rt;
2428 {
2429 struct ifnet *ifp; /* my outgoing interface */
2430 struct in6_addr *ifp_ll6;
2431 struct in6_addr *router_ll6;
2432 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2433 struct mbuf *m = NULL; /* newly allocated one */
2434 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2435 struct nd_redirect *nd_rd;
2436 size_t maxlen;
2437 u_char *p;
2438 struct ifnet *outif = NULL;
2439 struct sockaddr_in6 src_sa;
2440
2441 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2442
2443 /* if we are not router, we don't send icmp6 redirect */
2444 if (!ip6_forwarding || ip6_accept_rtadv)
2445 goto fail;
2446
2447 /* sanity check */
2448 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2449 goto fail;
2450
2451 /*
2452 * Address check:
2453 * the source address must identify a neighbor, and
2454 * the destination address must not be a multicast address
2455 * [RFC 2461, sec 8.2]
2456 */
2457 sip6 = mtod(m0, struct ip6_hdr *);
2458 bzero(&src_sa, sizeof(src_sa));
2459 src_sa.sin6_family = AF_INET6;
2460 src_sa.sin6_len = sizeof(src_sa);
2461 src_sa.sin6_addr = sip6->ip6_src;
2462 /* we don't currently use sin6_scope_id, but eventually use it */
2463 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src);
2464 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2465 goto fail;
2466 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2467 goto fail; /* what should we do here? */
2468
2469 /* rate limit */
2470 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2471 goto fail;
2472
2473 /*
2474 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2475 * we almost always ask for an mbuf cluster for simplicity.
2476 * (MHLEN < IPV6_MMTU is almost always true)
2477 */
2478 #if IPV6_MMTU >= MCLBYTES
2479 # error assumption failed about IPV6_MMTU and MCLBYTES
2480 #endif
2481 MGETHDR(m, M_DONTWAIT, MT_HEADER);
2482 if (m && IPV6_MMTU >= MHLEN)
2483 MCLGET(m, M_DONTWAIT);
2484 if (!m)
2485 goto fail;
2486 m->m_pkthdr.rcvif = NULL;
2487 m->m_len = 0;
2488 maxlen = M_TRAILINGSPACE(m);
2489 maxlen = min(IPV6_MMTU, maxlen);
2490 /* just for safety */
2491 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2492 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2493 goto fail;
2494 }
2495
2496 {
2497 /* get ip6 linklocal address for ifp(my outgoing interface). */
2498 struct in6_ifaddr *ia;
2499 if ((ia = in6ifa_ifpforlinklocal(ifp,
2500 IN6_IFF_NOTREADY|
2501 IN6_IFF_ANYCAST)) == NULL)
2502 goto fail;
2503 ifp_ll6 = &ia->ia_addr.sin6_addr;
2504 }
2505
2506 /* get ip6 linklocal address for the router. */
2507 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2508 struct sockaddr_in6 *sin6;
2509 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2510 router_ll6 = &sin6->sin6_addr;
2511 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2512 router_ll6 = (struct in6_addr *)NULL;
2513 } else
2514 router_ll6 = (struct in6_addr *)NULL;
2515
2516 /* ip6 */
2517 ip6 = mtod(m, struct ip6_hdr *);
2518 ip6->ip6_flow = 0;
2519 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2520 ip6->ip6_vfc |= IPV6_VERSION;
2521 /* ip6->ip6_plen will be set later */
2522 ip6->ip6_nxt = IPPROTO_ICMPV6;
2523 ip6->ip6_hlim = 255;
2524 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2525 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2526 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2527
2528 /* ND Redirect */
2529 nd_rd = (struct nd_redirect *)(ip6 + 1);
2530 nd_rd->nd_rd_type = ND_REDIRECT;
2531 nd_rd->nd_rd_code = 0;
2532 nd_rd->nd_rd_reserved = 0;
2533 if (rt->rt_flags & RTF_GATEWAY) {
2534 /*
2535 * nd_rd->nd_rd_target must be a link-local address in
2536 * better router cases.
2537 */
2538 if (!router_ll6)
2539 goto fail;
2540 bcopy(router_ll6, &nd_rd->nd_rd_target,
2541 sizeof(nd_rd->nd_rd_target));
2542 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2543 sizeof(nd_rd->nd_rd_dst));
2544 } else {
2545 /* make sure redtgt == reddst */
2546 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2547 sizeof(nd_rd->nd_rd_target));
2548 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2549 sizeof(nd_rd->nd_rd_dst));
2550 }
2551
2552 p = (u_char *)(nd_rd + 1);
2553
2554 if (!router_ll6)
2555 goto nolladdropt;
2556
2557 {
2558 /* target lladdr option */
2559 struct rtentry *rt_router = NULL;
2560 int len;
2561 struct sockaddr_dl *sdl;
2562 struct nd_opt_hdr *nd_opt;
2563 char *lladdr;
2564
2565 rt_router = nd6_lookup(router_ll6, 0, ifp);
2566 if (!rt_router)
2567 goto nolladdropt;
2568 len = sizeof(*nd_opt) + ifp->if_addrlen;
2569 len = (len + 7) & ~7; /* round by 8 */
2570 /* safety check */
2571 if (len + (p - (u_char *)ip6) > maxlen)
2572 goto nolladdropt;
2573 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2574 (rt_router->rt_flags & RTF_LLINFO) &&
2575 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2576 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
2577 sdl->sdl_alen) {
2578 nd_opt = (struct nd_opt_hdr *)p;
2579 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2580 nd_opt->nd_opt_len = len >> 3;
2581 lladdr = (char *)(nd_opt + 1);
2582 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2583 p += len;
2584 }
2585 }
2586 nolladdropt:;
2587
2588 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2589
2590 /* just to be safe */
2591 #ifdef M_DECRYPTED /*not openbsd*/
2592 if (m0->m_flags & M_DECRYPTED)
2593 goto noredhdropt;
2594 #endif
2595 if (p - (u_char *)ip6 > maxlen)
2596 goto noredhdropt;
2597
2598 {
2599 /* redirected header option */
2600 int len;
2601 struct nd_opt_rd_hdr *nd_opt_rh;
2602
2603 /*
2604 * compute the maximum size for icmp6 redirect header option.
2605 * XXX room for auth header?
2606 */
2607 len = maxlen - (p - (u_char *)ip6);
2608 len &= ~7;
2609
2610 /* This is just for simplicity. */
2611 if (m0->m_pkthdr.len != m0->m_len) {
2612 if (m0->m_next) {
2613 m_freem(m0->m_next);
2614 m0->m_next = NULL;
2615 }
2616 m0->m_pkthdr.len = m0->m_len;
2617 }
2618
2619 /*
2620 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2621 * about padding/truncate rule for the original IP packet.
2622 * From the discussion on IPv6imp in Feb 1999, the consensus was:
2623 * - "attach as much as possible" is the goal
2624 * - pad if not aligned (original size can be guessed by original
2625 * ip6 header)
2626 * Following code adds the padding if it is simple enough,
2627 * and truncates if not.
2628 */
2629 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2630 panic("assumption failed in %s:%d", __FILE__, __LINE__);
2631
2632 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2633 /* not enough room, truncate */
2634 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2635 } else {
2636 /* enough room, pad or truncate */
2637 size_t extra;
2638
2639 extra = m0->m_pkthdr.len % 8;
2640 if (extra) {
2641 /* pad if easy enough, truncate if not */
2642 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2643 /* pad */
2644 m0->m_len += (8 - extra);
2645 m0->m_pkthdr.len += (8 - extra);
2646 } else {
2647 /* truncate */
2648 m0->m_pkthdr.len -= extra;
2649 m0->m_len -= extra;
2650 }
2651 }
2652 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2653 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2654 }
2655
2656 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2657 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2658 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2659 nd_opt_rh->nd_opt_rh_len = len >> 3;
2660 p += sizeof(*nd_opt_rh);
2661 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2662
2663 /* connect m0 to m */
2664 m_tag_delete_chain(m0, NULL);
2665 m0->m_flags &= ~M_PKTHDR;
2666 m->m_next = m0;
2667 m->m_pkthdr.len = m->m_len + m0->m_len;
2668 m0 = NULL;
2669 }
2670 noredhdropt:;
2671 if (m0) {
2672 m_freem(m0);
2673 m0 = NULL;
2674 }
2675
2676 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src))
2677 sip6->ip6_src.s6_addr16[1] = 0;
2678 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst))
2679 sip6->ip6_dst.s6_addr16[1] = 0;
2680 #if 0
2681 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
2682 ip6->ip6_src.s6_addr16[1] = 0;
2683 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
2684 ip6->ip6_dst.s6_addr16[1] = 0;
2685 #endif
2686 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target))
2687 nd_rd->nd_rd_target.s6_addr16[1] = 0;
2688 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst))
2689 nd_rd->nd_rd_dst.s6_addr16[1] = 0;
2690
2691 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2692
2693 nd_rd->nd_rd_cksum = 0;
2694 nd_rd->nd_rd_cksum
2695 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2696
2697 /* send the packet to outside... */
2698 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2699 if (outif) {
2700 icmp6_ifstat_inc(outif, ifs6_out_msg);
2701 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2702 }
2703 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2704
2705 return;
2706
2707 fail:
2708 if (m)
2709 m_freem(m);
2710 if (m0)
2711 m_freem(m0);
2712 }
2713
2714 #ifdef HAVE_NRL_INPCB
2715 #define sotoin6pcb sotoinpcb
2716 #define in6pcb inpcb
2717 #define in6p_icmp6filt inp_icmp6filt
2718 #endif
2719 /*
2720 * ICMPv6 socket option processing.
2721 */
2722 int
2723 icmp6_ctloutput(so, sopt)
2724 struct socket *so;
2725 struct sockopt *sopt;
2726 {
2727 int error = 0;
2728 int optlen;
2729 struct inpcb *inp = sotoinpcb(so);
2730 int level, op, optname;
2731
2732 if (sopt) {
2733 level = sopt->sopt_level;
2734 op = sopt->sopt_dir;
2735 optname = sopt->sopt_name;
2736 optlen = sopt->sopt_valsize;
2737 } else
2738 level = op = optname = optlen = 0;
2739
2740 if (level != IPPROTO_ICMPV6) {
2741 return EINVAL;
2742 }
2743
2744 switch (op) {
2745 case PRCO_SETOPT:
2746 switch (optname) {
2747 case ICMP6_FILTER:
2748 {
2749 struct icmp6_filter *p;
2750
2751 if (optlen != sizeof(*p)) {
2752 error = EMSGSIZE;
2753 break;
2754 }
2755 if (inp->in6p_icmp6filt == NULL) {
2756 error = EINVAL;
2757 break;
2758 }
2759 error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen,
2760 optlen);
2761 break;
2762 }
2763
2764 default:
2765 error = ENOPROTOOPT;
2766 break;
2767 }
2768 break;
2769
2770 case PRCO_GETOPT:
2771 switch (optname) {
2772 case ICMP6_FILTER:
2773 {
2774 if (inp->in6p_icmp6filt == NULL) {
2775 error = EINVAL;
2776 break;
2777 }
2778 error = sooptcopyout(sopt, inp->in6p_icmp6filt,
2779 sizeof(struct icmp6_filter));
2780 break;
2781 }
2782
2783 default:
2784 error = ENOPROTOOPT;
2785 break;
2786 }
2787 break;
2788 }
2789
2790 return(error);
2791 }
2792 #ifdef HAVE_NRL_INPCB
2793 #undef sotoin6pcb
2794 #undef in6pcb
2795 #undef in6p_icmp6filt
2796 #endif
2797
2798 #ifndef HAVE_PPSRATECHECK
2799 #ifndef timersub
2800 #define timersub(tvp, uvp, vvp) \
2801 do { \
2802 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
2803 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
2804 if ((vvp)->tv_usec < 0) { \
2805 (vvp)->tv_sec--; \
2806 (vvp)->tv_usec += 1000000; \
2807 } \
2808 } while (0)
2809 #endif
2810
2811 /*
2812 * ppsratecheck(): packets (or events) per second limitation.
2813 */
2814 static int
2815 ppsratecheck(lasttime, curpps, maxpps)
2816 struct timeval *lasttime;
2817 int *curpps;
2818 int maxpps; /* maximum pps allowed */
2819 {
2820 struct timeval tv, delta;
2821 int s, rv;
2822
2823 s = splclock();
2824 microtime(&tv);
2825 splx(s);
2826
2827 timersub(&tv, lasttime, &delta);
2828
2829 /*
2830 * Check for 0,0 so that the message will be seen at least once.
2831 * If more than one second has passed since the last update of
2832 * lasttime, reset the counter.
2833 *
2834 * We do increment *curpps even in *curpps < maxpps case, as some may
2835 * try to use *curpps for stat purposes as well.
2836 */
2837 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
2838 delta.tv_sec >= 1) {
2839 *lasttime = tv;
2840 *curpps = 0;
2841 rv = 1;
2842 } else if (maxpps < 0)
2843 rv = 1;
2844 else if (*curpps < maxpps)
2845 rv = 1;
2846 else
2847 rv = 0;
2848
2849 #if 1 /* DIAGNOSTIC? */
2850 /* be careful about wrap-around */
2851 if (*curpps + 1 > *curpps)
2852 *curpps = *curpps + 1;
2853 #else
2854 /*
2855 * assume that there's not too many calls to this function.
2856 * not sure if the assumption holds, as it depends on *caller's*
2857 * behavior, not the behavior of this function.
2858 * IMHO it is wrong to make assumption on the caller's behavior,
2859 * so the above #if is #if 1, not #ifdef DIAGNOSTIC.
2860 */
2861 *curpps = *curpps + 1;
2862 #endif
2863
2864 return (rv);
2865 }
2866 #endif
2867
2868 /*
2869 * Perform rate limit check.
2870 * Returns 0 if it is okay to send the icmp6 packet.
2871 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2872 * limitation.
2873 *
2874 * XXX per-destination/type check necessary?
2875 */
2876 static int
2877 icmp6_ratelimit(dst, type, code)
2878 const struct in6_addr *dst; /* not used at this moment */
2879 const int type; /* not used at this moment */
2880 const int code; /* not used at this moment */
2881 {
2882 int ret;
2883
2884 ret = 0; /* okay to send */
2885
2886 /* PPS limit */
2887 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2888 icmp6errppslim)) {
2889 /* The packet is subject to rate limit */
2890 ret++;
2891 }
2892
2893 return ret;
2894 }
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