This commit represents a major revamping of the clock interrupt and timebase
[dragonfly.git] / sys / netinet6 / icmp6.c
CommitLineData
984263bc 1/* $FreeBSD: src/sys/netinet6/icmp6.c,v 1.6.2.13 2003/05/06 06:46:58 suz Exp $ */
88c4d2f6 2/* $DragonFly: src/sys/netinet6/icmp6.c,v 1.7 2004/01/30 05:42:17 dillon Exp $ */
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3/* $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $ */
4
5/*
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34/*
35 * Copyright (c) 1982, 1986, 1988, 1993
36 * The Regents of the University of California. All rights reserved.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. All advertising materials mentioning features or use of this software
47 * must display the following acknowledgement:
48 * This product includes software developed by the University of
49 * California, Berkeley and its contributors.
50 * 4. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
53 *
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64 * SUCH DAMAGE.
65 *
66 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
67 */
68
69#include "opt_inet.h"
70#include "opt_inet6.h"
71#include "opt_ipsec.h"
72
73#include <sys/param.h>
74#include <sys/systm.h>
75#include <sys/malloc.h>
76#include <sys/mbuf.h>
77#include <sys/protosw.h>
78#include <sys/socket.h>
79#include <sys/socketvar.h>
80#include <sys/time.h>
81#include <sys/kernel.h>
82#include <sys/syslog.h>
83#include <sys/domain.h>
84
85#include <net/if.h>
86#include <net/route.h>
87#include <net/if_dl.h>
88#include <net/if_types.h>
89
90#include <netinet/in.h>
91#include <netinet/in_var.h>
92#include <netinet/ip6.h>
93#include <netinet6/ip6_var.h>
94#include <netinet/icmp6.h>
95#include <netinet6/mld6_var.h>
96#include <netinet/in_pcb.h>
97#include <netinet6/in6_pcb.h>
98#include <netinet6/nd6.h>
99#include <netinet6/in6_ifattach.h>
100#include <netinet6/ip6protosw.h>
101
102#ifdef IPSEC
103#include <netinet6/ipsec.h>
d2438d69 104#include <netproto/key/key.h>
984263bc
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105#endif
106
107#ifdef FAST_IPSEC
1f2de5d4 108#include "ipsec.h"
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109#include <netipsec/key.h>
110#define IPSEC
111#endif
112
113#include <net/net_osdep.h>
114
115#ifdef HAVE_NRL_INPCB
116/* inpcb members */
117#define in6pcb inpcb
118#define in6p_laddr inp_laddr6
119#define in6p_faddr inp_faddr6
120#define in6p_icmp6filt inp_icmp6filt
121#define in6p_route inp_route
122#define in6p_socket inp_socket
123#define in6p_flags inp_flags
124#define in6p_moptions inp_moptions6
125#define in6p_outputopts inp_outputopts6
126#define in6p_ip6 inp_ipv6
127#define in6p_flowinfo inp_flowinfo
128#define in6p_sp inp_sp
129#define in6p_next inp_next
130#define in6p_prev inp_prev
131/* macro names */
132#define sotoin6pcb sotoinpcb
133/* function names */
134#define in6_pcbdetach in_pcbdetach
135#define in6_rtchange in_rtchange
136
137/*
138 * for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from
139 * others...
140 */
141#define in6p_ip6_nxt inp_ipv6.ip6_nxt
142#endif
143
7ee9fd3a
HP
144/*
145 * ppratecheck() is available, so define it here.
146 */
147#define HAVE_PPSRATECHECK
148
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149extern struct domain inet6domain;
150extern struct ip6protosw inet6sw[];
151extern u_char ip6_protox[];
152
153struct icmp6stat icmp6stat;
154
155extern struct inpcbhead ripcb;
156extern int icmp6errppslim;
157static int icmp6errpps_count = 0;
158static struct timeval icmp6errppslim_last;
159extern int icmp6_nodeinfo;
160
56d702cc
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161static void icmp6_errcount (struct icmp6errstat *, int, int);
162static int icmp6_rip6_input (struct mbuf **, int);
163static int icmp6_ratelimit (const struct in6_addr *, const int, const int);
164static const char *icmp6_redirect_diag (struct in6_addr *,
165 struct in6_addr *, struct in6_addr *);
984263bc 166#ifndef HAVE_PPSRATECHECK
56d702cc 167static int ppsratecheck (struct timeval *, int *, int);
984263bc 168#endif
56d702cc
RG
169static struct mbuf *ni6_input (struct mbuf *, int);
170static struct mbuf *ni6_nametodns (const char *, int, int);
171static int ni6_dnsmatch (const char *, int, const char *, int);
172static int ni6_addrs (struct icmp6_nodeinfo *, struct mbuf *,
173 struct ifnet **, char *);
174static int ni6_store_addrs (struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
175 struct ifnet *, int);
176static int icmp6_notify_error (struct mbuf *, int, int, int);
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177
178#ifdef COMPAT_RFC1885
179static struct route_in6 icmp6_reflect_rt;
180#endif
181
182
183void
184icmp6_init()
185{
186 mld6_init();
187}
188
189static void
190icmp6_errcount(stat, type, code)
191 struct icmp6errstat *stat;
192 int type, code;
193{
194 switch (type) {
195 case ICMP6_DST_UNREACH:
196 switch (code) {
197 case ICMP6_DST_UNREACH_NOROUTE:
198 stat->icp6errs_dst_unreach_noroute++;
199 return;
200 case ICMP6_DST_UNREACH_ADMIN:
201 stat->icp6errs_dst_unreach_admin++;
202 return;
203 case ICMP6_DST_UNREACH_BEYONDSCOPE:
204 stat->icp6errs_dst_unreach_beyondscope++;
205 return;
206 case ICMP6_DST_UNREACH_ADDR:
207 stat->icp6errs_dst_unreach_addr++;
208 return;
209 case ICMP6_DST_UNREACH_NOPORT:
210 stat->icp6errs_dst_unreach_noport++;
211 return;
212 }
213 break;
214 case ICMP6_PACKET_TOO_BIG:
215 stat->icp6errs_packet_too_big++;
216 return;
217 case ICMP6_TIME_EXCEEDED:
218 switch (code) {
219 case ICMP6_TIME_EXCEED_TRANSIT:
220 stat->icp6errs_time_exceed_transit++;
221 return;
222 case ICMP6_TIME_EXCEED_REASSEMBLY:
223 stat->icp6errs_time_exceed_reassembly++;
224 return;
225 }
226 break;
227 case ICMP6_PARAM_PROB:
228 switch (code) {
229 case ICMP6_PARAMPROB_HEADER:
230 stat->icp6errs_paramprob_header++;
231 return;
232 case ICMP6_PARAMPROB_NEXTHEADER:
233 stat->icp6errs_paramprob_nextheader++;
234 return;
235 case ICMP6_PARAMPROB_OPTION:
236 stat->icp6errs_paramprob_option++;
237 return;
238 }
239 break;
240 case ND_REDIRECT:
241 stat->icp6errs_redirect++;
242 return;
243 }
244 stat->icp6errs_unknown++;
245}
246
247/*
248 * Generate an error packet of type error in response to bad IP6 packet.
249 */
250void
251icmp6_error(m, type, code, param)
252 struct mbuf *m;
253 int type, code, param;
254{
255 struct ip6_hdr *oip6, *nip6;
256 struct icmp6_hdr *icmp6;
257 u_int preplen;
258 int off;
259 int nxt;
260
261 icmp6stat.icp6s_error++;
262
263 /* count per-type-code statistics */
264 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
265
266#ifdef M_DECRYPTED /*not openbsd*/
267 if (m->m_flags & M_DECRYPTED) {
268 icmp6stat.icp6s_canterror++;
269 goto freeit;
270 }
271#endif
272
273#ifndef PULLDOWN_TEST
274 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
275#else
276 if (m->m_len < sizeof(struct ip6_hdr)) {
277 m = m_pullup(m, sizeof(struct ip6_hdr));
278 if (m == NULL)
279 return;
280 }
281#endif
282 oip6 = mtod(m, struct ip6_hdr *);
283
284 /*
285 * Multicast destination check. For unrecognized option errors,
286 * this check has already done in ip6_unknown_opt(), so we can
287 * check only for other errors.
288 */
289 if ((m->m_flags & (M_BCAST|M_MCAST) ||
290 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
291 (type != ICMP6_PACKET_TOO_BIG &&
292 (type != ICMP6_PARAM_PROB ||
293 code != ICMP6_PARAMPROB_OPTION)))
294 goto freeit;
295
296 /* Source address check. XXX: the case of anycast source? */
297 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
298 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
299 goto freeit;
300
301 /*
302 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
303 * don't do it.
304 */
305 nxt = -1;
306 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
307 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
308 struct icmp6_hdr *icp;
309
310#ifndef PULLDOWN_TEST
311 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
312 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
313#else
314 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
315 sizeof(*icp));
316 if (icp == NULL) {
317 icmp6stat.icp6s_tooshort++;
318 return;
319 }
320#endif
321 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
322 icp->icmp6_type == ND_REDIRECT) {
323 /*
324 * ICMPv6 error
325 * Special case: for redirect (which is
326 * informational) we must not send icmp6 error.
327 */
328 icmp6stat.icp6s_canterror++;
329 goto freeit;
330 } else {
331 /* ICMPv6 informational - send the error */
332 }
333 } else {
334 /* non-ICMPv6 - send the error */
335 }
336
337 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
338
339 /* Finally, do rate limitation check. */
340 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
341 icmp6stat.icp6s_toofreq++;
342 goto freeit;
343 }
344
345 /*
346 * OK, ICMP6 can be generated.
347 */
348
349 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
350 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
351
352 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
353 M_PREPEND(m, preplen, M_DONTWAIT);
354 if (m && m->m_len < preplen)
355 m = m_pullup(m, preplen);
356 if (m == NULL) {
357 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
358 return;
359 }
360
361 nip6 = mtod(m, struct ip6_hdr *);
362 nip6->ip6_src = oip6->ip6_src;
363 nip6->ip6_dst = oip6->ip6_dst;
364
365 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
366 oip6->ip6_src.s6_addr16[1] = 0;
367 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
368 oip6->ip6_dst.s6_addr16[1] = 0;
369
370 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
371 icmp6->icmp6_type = type;
372 icmp6->icmp6_code = code;
373 icmp6->icmp6_pptr = htonl((u_int32_t)param);
374
375 /*
376 * icmp6_reflect() is designed to be in the input path.
377 * icmp6_error() can be called from both input and outut path,
378 * and if we are in output path rcvif could contain bogus value.
379 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
380 * information in ip header (nip6).
381 */
382 m->m_pkthdr.rcvif = NULL;
383
384 icmp6stat.icp6s_outhist[type]++;
385 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
386
387 return;
388
389 freeit:
390 /*
391 * If we can't tell wheter or not we can generate ICMP6, free it.
392 */
393 m_freem(m);
394}
395
396/*
397 * Process a received ICMP6 message.
398 */
399int
400icmp6_input(mp, offp, proto)
401 struct mbuf **mp;
402 int *offp, proto;
403{
404 struct mbuf *m = *mp, *n;
405 struct ip6_hdr *ip6, *nip6;
406 struct icmp6_hdr *icmp6, *nicmp6;
407 int off = *offp;
408 int icmp6len = m->m_pkthdr.len - *offp;
409 int code, sum, noff;
410
411#ifndef PULLDOWN_TEST
412 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
413 /* m might change if M_LOOP. So, call mtod after this */
414#endif
415
416 /*
417 * Locate icmp6 structure in mbuf, and check
418 * that not corrupted and of at least minimum length
419 */
420
421 ip6 = mtod(m, struct ip6_hdr *);
422 if (icmp6len < sizeof(struct icmp6_hdr)) {
423 icmp6stat.icp6s_tooshort++;
424 goto freeit;
425 }
426
427 /*
428 * calculate the checksum
429 */
430#ifndef PULLDOWN_TEST
431 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
432#else
433 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
434 if (icmp6 == NULL) {
435 icmp6stat.icp6s_tooshort++;
436 return IPPROTO_DONE;
437 }
438#endif
439 code = icmp6->icmp6_code;
440
441 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
442 nd6log((LOG_ERR,
443 "ICMP6 checksum error(%d|%x) %s\n",
444 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
445 icmp6stat.icp6s_checksum++;
446 goto freeit;
447 }
448
449 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
450 /*
451 * Deliver very specific ICMP6 type only.
452 * This is important to deilver TOOBIG. Otherwise PMTUD
453 * will not work.
454 */
455 switch (icmp6->icmp6_type) {
456 case ICMP6_DST_UNREACH:
457 case ICMP6_PACKET_TOO_BIG:
458 case ICMP6_TIME_EXCEEDED:
459 break;
460 default:
461 goto freeit;
462 }
463 }
464
465 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
466 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
467 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
468 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
469
470 switch (icmp6->icmp6_type) {
471 case ICMP6_DST_UNREACH:
472 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
473 switch (code) {
474 case ICMP6_DST_UNREACH_NOROUTE:
475 code = PRC_UNREACH_NET;
476 break;
477 case ICMP6_DST_UNREACH_ADMIN:
478 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
479 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
480 break;
481 case ICMP6_DST_UNREACH_ADDR:
482 code = PRC_HOSTDEAD;
483 break;
484#ifdef COMPAT_RFC1885
485 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
486 code = PRC_UNREACH_SRCFAIL;
487 break;
488#else
489 case ICMP6_DST_UNREACH_BEYONDSCOPE:
490 /* I mean "source address was incorrect." */
491 code = PRC_PARAMPROB;
492 break;
493#endif
494 case ICMP6_DST_UNREACH_NOPORT:
495 code = PRC_UNREACH_PORT;
496 break;
497 default:
498 goto badcode;
499 }
500 goto deliver;
501 break;
502
503 case ICMP6_PACKET_TOO_BIG:
504 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
505 if (code != 0)
506 goto badcode;
507
508 code = PRC_MSGSIZE;
509
510 /*
511 * Updating the path MTU will be done after examining
512 * intermediate extension headers.
513 */
514 goto deliver;
515 break;
516
517 case ICMP6_TIME_EXCEEDED:
518 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
519 switch (code) {
520 case ICMP6_TIME_EXCEED_TRANSIT:
521 case ICMP6_TIME_EXCEED_REASSEMBLY:
522 code += PRC_TIMXCEED_INTRANS;
523 break;
524 default:
525 goto badcode;
526 }
527 goto deliver;
528 break;
529
530 case ICMP6_PARAM_PROB:
531 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
532 switch (code) {
533 case ICMP6_PARAMPROB_NEXTHEADER:
534 code = PRC_UNREACH_PROTOCOL;
535 break;
536 case ICMP6_PARAMPROB_HEADER:
537 case ICMP6_PARAMPROB_OPTION:
538 code = PRC_PARAMPROB;
539 break;
540 default:
541 goto badcode;
542 }
543 goto deliver;
544 break;
545
546 case ICMP6_ECHO_REQUEST:
547 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
548 if (code != 0)
549 goto badcode;
550 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
551 /* Give up remote */
552 break;
553 }
554 if ((n->m_flags & M_EXT) != 0
555 || n->m_len < off + sizeof(struct icmp6_hdr)) {
556 struct mbuf *n0 = n;
557 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
558 int n0len;
559
560 /*
561 * Prepare an internal mbuf. m_pullup() doesn't
562 * always copy the length we specified.
563 */
564 if (maxlen >= MCLBYTES) {
565 /* Give up remote */
566 m_freem(n0);
567 break;
568 }
569 MGETHDR(n, M_DONTWAIT, n0->m_type);
570 n0len = n0->m_pkthdr.len; /* save for use below */
571 if (n)
572 M_MOVE_PKTHDR(n, n0);
573 if (n && maxlen >= MHLEN) {
574 MCLGET(n, M_DONTWAIT);
575 if ((n->m_flags & M_EXT) == 0) {
576 m_free(n);
577 n = NULL;
578 }
579 }
580 if (n == NULL) {
581 /* Give up remote */
582 m_freem(n0);
583 break;
584 }
585 /*
586 * Copy IPv6 and ICMPv6 only.
587 */
588 nip6 = mtod(n, struct ip6_hdr *);
589 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
590 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
591 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
592 noff = sizeof(struct ip6_hdr);
593 /* new mbuf contains only ipv6+icmpv6 headers */
594 n->m_len = noff + sizeof(struct icmp6_hdr);
595 /*
596 * Adjust mbuf. ip6_plen will be adjusted in
597 * ip6_output().
598 */
599 m_adj(n0, off + sizeof(struct icmp6_hdr));
600 /* recalculate complete packet size */
601 n->m_pkthdr.len = n0len + (noff - off);
602 n->m_next = n0;
603 } else {
604 nip6 = mtod(n, struct ip6_hdr *);
605 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off);
606 noff = off;
607 }
608 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
609 nicmp6->icmp6_code = 0;
610 if (n) {
611 icmp6stat.icp6s_reflect++;
612 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
613 icmp6_reflect(n, noff);
614 }
615 break;
616
617 case ICMP6_ECHO_REPLY:
618 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
619 if (code != 0)
620 goto badcode;
621 break;
622
623 case MLD_LISTENER_QUERY:
624 case MLD_LISTENER_REPORT:
625 if (icmp6len < sizeof(struct mld_hdr))
626 goto badlen;
627 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
628 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
629 else
630 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
631 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
632 /* give up local */
633 mld6_input(m, off);
634 m = NULL;
635 goto freeit;
636 }
637 mld6_input(n, off);
638 /* m stays. */
639 break;
640
641 case MLD_LISTENER_DONE:
642 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
643 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
644 goto badlen;
645 break; /* nothing to be done in kernel */
646
647 case MLD_MTRACE_RESP:
648 case MLD_MTRACE:
649 /* XXX: these two are experimental. not officially defind. */
650 /* XXX: per-interface statistics? */
651 break; /* just pass it to applications */
652
653 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
654 {
655 enum { WRU, FQDN } mode;
656
657 if (!icmp6_nodeinfo)
658 break;
659
660 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
661 mode = WRU;
662 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
663 mode = FQDN;
664 else
665 goto badlen;
666
667#define hostnamelen strlen(hostname)
668 if (mode == FQDN) {
669#ifndef PULLDOWN_TEST
670 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
671 IPPROTO_DONE);
672#endif
673 n = m_copy(m, 0, M_COPYALL);
674 if (n)
675 n = ni6_input(n, off);
676 /* XXX meaningless if n == NULL */
677 noff = sizeof(struct ip6_hdr);
678 } else {
679 u_char *p;
680 int maxlen, maxhlen;
681
682 if ((icmp6_nodeinfo & 5) != 5)
683 break;
684
685 if (code != 0)
686 goto badcode;
687 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
688 if (maxlen >= MCLBYTES) {
689 /* Give up remote */
690 break;
691 }
692 MGETHDR(n, M_DONTWAIT, m->m_type);
693 if (n && maxlen > MHLEN) {
694 MCLGET(n, M_DONTWAIT);
695 if ((n->m_flags & M_EXT) == 0) {
696 m_free(n);
697 n = NULL;
698 }
699 }
700 if (!m_dup_pkthdr(n, m, M_DONTWAIT)) {
701 /*
702 * Previous code did a blind M_COPY_PKTHDR
703 * and said "just for rcvif". If true, then
704 * we could tolerate the dup failing (due to
705 * the deep copy of the tag chain). For now
706 * be conservative and just fail.
707 */
708 m_free(n);
709 n = NULL;
710 }
711 if (n == NULL) {
712 /* Give up remote */
713 break;
714 }
715 n->m_pkthdr.rcvif = NULL;
716 n->m_len = 0;
717 maxhlen = M_TRAILINGSPACE(n) - maxlen;
718 if (maxhlen > hostnamelen)
719 maxhlen = hostnamelen;
720 /*
721 * Copy IPv6 and ICMPv6 only.
722 */
723 nip6 = mtod(n, struct ip6_hdr *);
724 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
725 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
726 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
727 p = (u_char *)(nicmp6 + 1);
728 bzero(p, 4);
729 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
730 noff = sizeof(struct ip6_hdr);
731 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
732 sizeof(struct icmp6_hdr) + 4 + maxhlen;
733 nicmp6->icmp6_type = ICMP6_WRUREPLY;
734 nicmp6->icmp6_code = 0;
735 }
736#undef hostnamelen
737 if (n) {
738 icmp6stat.icp6s_reflect++;
739 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
740 icmp6_reflect(n, noff);
741 }
742 break;
743 }
744
745 case ICMP6_WRUREPLY:
746 if (code != 0)
747 goto badcode;
748 break;
749
750 case ND_ROUTER_SOLICIT:
751 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
752 if (code != 0)
753 goto badcode;
754 if (icmp6len < sizeof(struct nd_router_solicit))
755 goto badlen;
756 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
757 /* give up local */
758 nd6_rs_input(m, off, icmp6len);
759 m = NULL;
760 goto freeit;
761 }
762 nd6_rs_input(n, off, icmp6len);
763 /* m stays. */
764 break;
765
766 case ND_ROUTER_ADVERT:
767 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
768 if (code != 0)
769 goto badcode;
770 if (icmp6len < sizeof(struct nd_router_advert))
771 goto badlen;
772 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
773 /* give up local */
774 nd6_ra_input(m, off, icmp6len);
775 m = NULL;
776 goto freeit;
777 }
778 nd6_ra_input(n, off, icmp6len);
779 /* m stays. */
780 break;
781
782 case ND_NEIGHBOR_SOLICIT:
783 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
784 if (code != 0)
785 goto badcode;
786 if (icmp6len < sizeof(struct nd_neighbor_solicit))
787 goto badlen;
788 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
789 /* give up local */
790 nd6_ns_input(m, off, icmp6len);
791 m = NULL;
792 goto freeit;
793 }
794 nd6_ns_input(n, off, icmp6len);
795 /* m stays. */
796 break;
797
798 case ND_NEIGHBOR_ADVERT:
799 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
800 if (code != 0)
801 goto badcode;
802 if (icmp6len < sizeof(struct nd_neighbor_advert))
803 goto badlen;
804 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
805 /* give up local */
806 nd6_na_input(m, off, icmp6len);
807 m = NULL;
808 goto freeit;
809 }
810 nd6_na_input(n, off, icmp6len);
811 /* m stays. */
812 break;
813
814 case ND_REDIRECT:
815 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
816 if (code != 0)
817 goto badcode;
818 if (icmp6len < sizeof(struct nd_redirect))
819 goto badlen;
820 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
821 /* give up local */
822 icmp6_redirect_input(m, off);
823 m = NULL;
824 goto freeit;
825 }
826 icmp6_redirect_input(n, off);
827 /* m stays. */
828 break;
829
830 case ICMP6_ROUTER_RENUMBERING:
831 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
832 code != ICMP6_ROUTER_RENUMBERING_RESULT)
833 goto badcode;
834 if (icmp6len < sizeof(struct icmp6_router_renum))
835 goto badlen;
836 break;
837
838 default:
839 nd6log((LOG_DEBUG,
840 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
841 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
842 ip6_sprintf(&ip6->ip6_dst),
843 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
844 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
845 /* ICMPv6 error: MUST deliver it by spec... */
846 code = PRC_NCMDS;
847 /* deliver */
848 } else {
849 /* ICMPv6 informational: MUST not deliver */
850 break;
851 }
852 deliver:
853 if (icmp6_notify_error(m, off, icmp6len, code)) {
854 /* In this case, m should've been freed. */
855 return(IPPROTO_DONE);
856 }
857 break;
858
859 badcode:
860 icmp6stat.icp6s_badcode++;
861 break;
862
863 badlen:
864 icmp6stat.icp6s_badlen++;
865 break;
866 }
867
868 /* deliver the packet to appropriate sockets */
869 icmp6_rip6_input(&m, *offp);
870
871 return IPPROTO_DONE;
872
873 freeit:
874 m_freem(m);
875 return IPPROTO_DONE;
876}
877
878static int
879icmp6_notify_error(m, off, icmp6len, code)
880 struct mbuf *m;
881 int off, icmp6len;
882{
883 struct icmp6_hdr *icmp6;
884 struct ip6_hdr *eip6;
885 u_int32_t notifymtu;
886 struct sockaddr_in6 icmp6src, icmp6dst;
887
888 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
889 icmp6stat.icp6s_tooshort++;
890 goto freeit;
891 }
892#ifndef PULLDOWN_TEST
893 IP6_EXTHDR_CHECK(m, off,
894 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
895 -1);
896 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
897#else
898 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
899 sizeof(*icmp6) + sizeof(struct ip6_hdr));
900 if (icmp6 == NULL) {
901 icmp6stat.icp6s_tooshort++;
902 return(-1);
903 }
904#endif
905 eip6 = (struct ip6_hdr *)(icmp6 + 1);
906
907 /* Detect the upper level protocol */
908 {
56d702cc 909 void (*ctlfunc) (int, struct sockaddr *, void *);
984263bc
MD
910 u_int8_t nxt = eip6->ip6_nxt;
911 int eoff = off + sizeof(struct icmp6_hdr) +
912 sizeof(struct ip6_hdr);
913 struct ip6ctlparam ip6cp;
914 struct in6_addr *finaldst = NULL;
915 int icmp6type = icmp6->icmp6_type;
916 struct ip6_frag *fh;
917 struct ip6_rthdr *rth;
918 struct ip6_rthdr0 *rth0;
919 int rthlen;
920
921 while (1) { /* XXX: should avoid infinite loop explicitly? */
922 struct ip6_ext *eh;
923
924 switch (nxt) {
925 case IPPROTO_HOPOPTS:
926 case IPPROTO_DSTOPTS:
927 case IPPROTO_AH:
928#ifndef PULLDOWN_TEST
929 IP6_EXTHDR_CHECK(m, 0, eoff +
930 sizeof(struct ip6_ext),
931 -1);
932 eh = (struct ip6_ext *)(mtod(m, caddr_t)
933 + eoff);
934#else
935 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
936 eoff, sizeof(*eh));
937 if (eh == NULL) {
938 icmp6stat.icp6s_tooshort++;
939 return(-1);
940 }
941#endif
942
943 if (nxt == IPPROTO_AH)
944 eoff += (eh->ip6e_len + 2) << 2;
945 else
946 eoff += (eh->ip6e_len + 1) << 3;
947 nxt = eh->ip6e_nxt;
948 break;
949 case IPPROTO_ROUTING:
950 /*
951 * When the erroneous packet contains a
952 * routing header, we should examine the
953 * header to determine the final destination.
954 * Otherwise, we can't properly update
955 * information that depends on the final
956 * destination (e.g. path MTU).
957 */
958#ifndef PULLDOWN_TEST
959 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
960 -1);
961 rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
962 + eoff);
963#else
964 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
965 eoff, sizeof(*rth));
966 if (rth == NULL) {
967 icmp6stat.icp6s_tooshort++;
968 return(-1);
969 }
970#endif
971 rthlen = (rth->ip6r_len + 1) << 3;
972 /*
973 * XXX: currently there is no
974 * officially defined type other
975 * than type-0.
976 * Note that if the segment left field
977 * is 0, all intermediate hops must
978 * have been passed.
979 */
980 if (rth->ip6r_segleft &&
981 rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
982 int hops;
983
984#ifndef PULLDOWN_TEST
985 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen,
986 -1);
987 rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff);
988#else
989 IP6_EXTHDR_GET(rth0,
990 struct ip6_rthdr0 *, m,
991 eoff, rthlen);
992 if (rth0 == NULL) {
993 icmp6stat.icp6s_tooshort++;
994 return(-1);
995 }
996#endif
997 /* just ignore a bogus header */
998 if ((rth0->ip6r0_len % 2) == 0 &&
999 (hops = rth0->ip6r0_len/2))
1000 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
1001 }
1002 eoff += rthlen;
1003 nxt = rth->ip6r_nxt;
1004 break;
1005 case IPPROTO_FRAGMENT:
1006#ifndef PULLDOWN_TEST
1007 IP6_EXTHDR_CHECK(m, 0, eoff +
1008 sizeof(struct ip6_frag),
1009 -1);
1010 fh = (struct ip6_frag *)(mtod(m, caddr_t)
1011 + eoff);
1012#else
1013 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
1014 eoff, sizeof(*fh));
1015 if (fh == NULL) {
1016 icmp6stat.icp6s_tooshort++;
1017 return(-1);
1018 }
1019#endif
1020 /*
1021 * Data after a fragment header is meaningless
1022 * unless it is the first fragment, but
1023 * we'll go to the notify label for path MTU
1024 * discovery.
1025 */
1026 if (fh->ip6f_offlg & IP6F_OFF_MASK)
1027 goto notify;
1028
1029 eoff += sizeof(struct ip6_frag);
1030 nxt = fh->ip6f_nxt;
1031 break;
1032 default:
1033 /*
1034 * This case includes ESP and the No Next
1035 * Header. In such cases going to the notify
1036 * label does not have any meaning
1037 * (i.e. ctlfunc will be NULL), but we go
1038 * anyway since we might have to update
1039 * path MTU information.
1040 */
1041 goto notify;
1042 }
1043 }
1044 notify:
1045#ifndef PULLDOWN_TEST
1046 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1047#else
1048 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1049 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1050 if (icmp6 == NULL) {
1051 icmp6stat.icp6s_tooshort++;
1052 return(-1);
1053 }
1054#endif
1055
1056 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1057 bzero(&icmp6dst, sizeof(icmp6dst));
1058 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1059 icmp6dst.sin6_family = AF_INET6;
1060 if (finaldst == NULL)
1061 icmp6dst.sin6_addr = eip6->ip6_dst;
1062 else
1063 icmp6dst.sin6_addr = *finaldst;
1064 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1065 &icmp6dst.sin6_addr);
1066#ifndef SCOPEDROUTING
1067 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst,
1068 NULL, NULL)) {
1069 /* should be impossbile */
1070 nd6log((LOG_DEBUG,
1071 "icmp6_notify_error: in6_embedscope failed\n"));
1072 goto freeit;
1073 }
1074#endif
1075
1076 /*
1077 * retrieve parameters from the inner IPv6 header, and convert
1078 * them into sockaddr structures.
1079 */
1080 bzero(&icmp6src, sizeof(icmp6src));
1081 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1082 icmp6src.sin6_family = AF_INET6;
1083 icmp6src.sin6_addr = eip6->ip6_src;
1084 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1085 &icmp6src.sin6_addr);
1086#ifndef SCOPEDROUTING
1087 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src,
1088 NULL, NULL)) {
1089 /* should be impossbile */
1090 nd6log((LOG_DEBUG,
1091 "icmp6_notify_error: in6_embedscope failed\n"));
1092 goto freeit;
1093 }
1094#endif
1095 icmp6src.sin6_flowinfo =
1096 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1097
1098 if (finaldst == NULL)
1099 finaldst = &eip6->ip6_dst;
1100 ip6cp.ip6c_m = m;
1101 ip6cp.ip6c_icmp6 = icmp6;
1102 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1103 ip6cp.ip6c_off = eoff;
1104 ip6cp.ip6c_finaldst = finaldst;
1105 ip6cp.ip6c_src = &icmp6src;
1106 ip6cp.ip6c_nxt = nxt;
1107
1108 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1109 notifymtu = ntohl(icmp6->icmp6_mtu);
1110 ip6cp.ip6c_cmdarg = (void *)&notifymtu;
1111 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1112 }
1113
56d702cc 1114 ctlfunc = (void (*) (int, struct sockaddr *, void *))
984263bc
MD
1115 (inet6sw[ip6_protox[nxt]].pr_ctlinput);
1116 if (ctlfunc) {
1117 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
1118 &ip6cp);
1119 }
1120 }
1121 return(0);
1122
1123 freeit:
1124 m_freem(m);
1125 return(-1);
1126}
1127
1128void
1129icmp6_mtudisc_update(ip6cp, validated)
1130 struct ip6ctlparam *ip6cp;
1131 int validated;
1132{
1133 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1134 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1135 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1136 u_int mtu = ntohl(icmp6->icmp6_mtu);
1137 struct rtentry *rt = NULL;
1138 struct sockaddr_in6 sin6;
1139
1140 if (!validated)
1141 return;
1142
1143 bzero(&sin6, sizeof(sin6));
1144 sin6.sin6_family = PF_INET6;
1145 sin6.sin6_len = sizeof(struct sockaddr_in6);
1146 sin6.sin6_addr = *dst;
1147 /* XXX normally, this won't happen */
1148 if (IN6_IS_ADDR_LINKLOCAL(dst)) {
1149 sin6.sin6_addr.s6_addr16[1] =
1150 htons(m->m_pkthdr.rcvif->if_index);
1151 }
1152 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
1153 rt = rtalloc1((struct sockaddr *)&sin6, 0,
1154 RTF_CLONING | RTF_PRCLONING);
1155
1156 if (rt && (rt->rt_flags & RTF_HOST)
1157 && !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
1158 if (mtu < IPV6_MMTU) {
1159 /* xxx */
1160 rt->rt_rmx.rmx_locks |= RTV_MTU;
1161 } else if (mtu < rt->rt_ifp->if_mtu &&
1162 rt->rt_rmx.rmx_mtu > mtu) {
1163 icmp6stat.icp6s_pmtuchg++;
1164 rt->rt_rmx.rmx_mtu = mtu;
1165 }
1166 }
1167 if (rt) { /* XXX: need braces to avoid conflict with else in RTFREE. */
1168 RTFREE(rt);
1169 }
1170}
1171
1172/*
1173 * Process a Node Information Query packet, based on
1174 * draft-ietf-ipngwg-icmp-name-lookups-07.
1175 *
1176 * Spec incompatibilities:
1177 * - IPv6 Subject address handling
1178 * - IPv4 Subject address handling support missing
1179 * - Proxy reply (answer even if it's not for me)
1180 * - joins NI group address at in6_ifattach() time only, does not cope
1181 * with hostname changes by sethostname(3)
1182 */
1183#define hostnamelen strlen(hostname)
1184static struct mbuf *
1185ni6_input(m, off)
1186 struct mbuf *m;
1187 int off;
1188{
1189 struct icmp6_nodeinfo *ni6, *nni6;
1190 struct mbuf *n = NULL;
1191 u_int16_t qtype;
1192 int subjlen;
1193 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1194 struct ni_reply_fqdn *fqdn;
1195 int addrs; /* for NI_QTYPE_NODEADDR */
1196 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1197 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
1198 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
1199 struct ip6_hdr *ip6;
1200 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1201 char *subj = NULL;
1202 struct in6_ifaddr *ia6 = NULL;
1203
1204 ip6 = mtod(m, struct ip6_hdr *);
1205#ifndef PULLDOWN_TEST
1206 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1207#else
1208 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1209 if (ni6 == NULL) {
1210 /* m is already reclaimed */
1211 return NULL;
1212 }
1213#endif
1214
1215 /*
1216 * Validate IPv6 destination address.
1217 *
1218 * The Responder must discard the Query without further processing
1219 * unless it is one of the Responder's unicast or anycast addresses, or
1220 * a link-local scope multicast address which the Responder has joined.
1221 * [icmp-name-lookups-07, Section 4.]
1222 */
1223 bzero(&sin6, sizeof(sin6));
1224 sin6.sin6_family = AF_INET6;
1225 sin6.sin6_len = sizeof(struct sockaddr_in6);
1226 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
1227 /* XXX scopeid */
1228 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) {
1229 /* unicast/anycast, fine */
1230 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1231 (icmp6_nodeinfo & 4) == 0) {
1232 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1233 "a temporary address in %s:%d",
1234 __FILE__, __LINE__));
1235 goto bad;
1236 }
1237 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr))
1238 ; /* link-local multicast, fine */
1239 else
1240 goto bad;
1241
1242 /* validate query Subject field. */
1243 qtype = ntohs(ni6->ni_qtype);
1244 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1245 switch (qtype) {
1246 case NI_QTYPE_NOOP:
1247 case NI_QTYPE_SUPTYPES:
1248 /* 07 draft */
1249 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1250 break;
1251 /* FALLTHROUGH */
1252 case NI_QTYPE_FQDN:
1253 case NI_QTYPE_NODEADDR:
1254 switch (ni6->ni_code) {
1255 case ICMP6_NI_SUBJ_IPV6:
1256#if ICMP6_NI_SUBJ_IPV6 != 0
1257 case 0:
1258#endif
1259 /*
1260 * backward compatibility - try to accept 03 draft
1261 * format, where no Subject is present.
1262 */
1263 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1264 subjlen == 0) {
1265 oldfqdn++;
1266 break;
1267 }
1268#if ICMP6_NI_SUBJ_IPV6 != 0
1269 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1270 goto bad;
1271#endif
1272
1273 if (subjlen != sizeof(sin6.sin6_addr))
1274 goto bad;
1275
1276 /*
1277 * Validate Subject address.
1278 *
1279 * Not sure what exactly "address belongs to the node"
1280 * means in the spec, is it just unicast, or what?
1281 *
1282 * At this moment we consider Subject address as
1283 * "belong to the node" if the Subject address equals
1284 * to the IPv6 destination address; validation for
1285 * IPv6 destination address should have done enough
1286 * check for us.
1287 *
1288 * We do not do proxy at this moment.
1289 */
1290 /* m_pulldown instead of copy? */
1291 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1292 subjlen, (caddr_t)&sin6.sin6_addr);
1293 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1294 &sin6.sin6_addr);
1295#ifndef SCOPEDROUTING
1296 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL);
1297#endif
1298 bzero(&sin6_d, sizeof(sin6_d));
1299 sin6_d.sin6_family = AF_INET6; /* not used, actually */
1300 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */
1301 sin6_d.sin6_addr = ip6->ip6_dst;
1302 sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1303 &ip6->ip6_dst);
1304#ifndef SCOPEDROUTING
1305 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL);
1306#endif
1307 subj = (char *)&sin6;
1308 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
1309 break;
1310
1311 /*
1312 * XXX if we are to allow other cases, we should really
1313 * be careful about scope here.
1314 * basically, we should disallow queries toward IPv6
1315 * destination X with subject Y, if scope(X) > scope(Y).
1316 * if we allow scope(X) > scope(Y), it will result in
1317 * information leakage across scope boundary.
1318 */
1319 goto bad;
1320
1321 case ICMP6_NI_SUBJ_FQDN:
1322 /*
1323 * Validate Subject name with gethostname(3).
1324 *
1325 * The behavior may need some debate, since:
1326 * - we are not sure if the node has FQDN as
1327 * hostname (returned by gethostname(3)).
1328 * - the code does wildcard match for truncated names.
1329 * however, we are not sure if we want to perform
1330 * wildcard match, if gethostname(3) side has
1331 * truncated hostname.
1332 */
1333 n = ni6_nametodns(hostname, hostnamelen, 0);
1334 if (!n || n->m_next || n->m_len == 0)
1335 goto bad;
1336 IP6_EXTHDR_GET(subj, char *, m,
1337 off + sizeof(struct icmp6_nodeinfo), subjlen);
1338 if (subj == NULL)
1339 goto bad;
1340 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1341 n->m_len)) {
1342 goto bad;
1343 }
1344 m_freem(n);
1345 n = NULL;
1346 break;
1347
1348 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1349 default:
1350 goto bad;
1351 }
1352 break;
1353 }
1354
1355 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1356 switch (qtype) {
1357 case NI_QTYPE_FQDN:
1358 if ((icmp6_nodeinfo & 1) == 0)
1359 goto bad;
1360 break;
1361 case NI_QTYPE_NODEADDR:
1362 if ((icmp6_nodeinfo & 2) == 0)
1363 goto bad;
1364 break;
1365 }
1366
1367 /* guess reply length */
1368 switch (qtype) {
1369 case NI_QTYPE_NOOP:
1370 break; /* no reply data */
1371 case NI_QTYPE_SUPTYPES:
1372 replylen += sizeof(u_int32_t);
1373 break;
1374 case NI_QTYPE_FQDN:
1375 /* XXX will append an mbuf */
1376 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1377 break;
1378 case NI_QTYPE_NODEADDR:
1379 addrs = ni6_addrs(ni6, m, &ifp, subj);
1380 if ((replylen += addrs * (sizeof(struct in6_addr) +
1381 sizeof(u_int32_t))) > MCLBYTES)
1382 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1383 break;
1384 default:
1385 /*
1386 * XXX: We must return a reply with the ICMP6 code
1387 * `unknown Qtype' in this case. However we regard the case
1388 * as an FQDN query for backward compatibility.
1389 * Older versions set a random value to this field,
1390 * so it rarely varies in the defined qtypes.
1391 * But the mechanism is not reliable...
1392 * maybe we should obsolete older versions.
1393 */
1394 qtype = NI_QTYPE_FQDN;
1395 /* XXX will append an mbuf */
1396 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1397 oldfqdn++;
1398 break;
1399 }
1400
1401 /* allocate an mbuf to reply. */
1402 MGETHDR(n, M_DONTWAIT, m->m_type);
1403 if (n == NULL) {
1404 m_freem(m);
1405 return(NULL);
1406 }
1407 M_MOVE_PKTHDR(n, m); /* just for recvif */
1408 if (replylen > MHLEN) {
1409 if (replylen > MCLBYTES) {
1410 /*
1411 * XXX: should we try to allocate more? But MCLBYTES
1412 * is probably much larger than IPV6_MMTU...
1413 */
1414 goto bad;
1415 }
1416 MCLGET(n, M_DONTWAIT);
1417 if ((n->m_flags & M_EXT) == 0) {
1418 goto bad;
1419 }
1420 }
1421 n->m_pkthdr.len = n->m_len = replylen;
1422
1423 /* copy mbuf header and IPv6 + Node Information base headers */
1424 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1425 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1426 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1427
1428 /* qtype dependent procedure */
1429 switch (qtype) {
1430 case NI_QTYPE_NOOP:
1431 nni6->ni_code = ICMP6_NI_SUCCESS;
1432 nni6->ni_flags = 0;
1433 break;
1434 case NI_QTYPE_SUPTYPES:
1435 {
1436 u_int32_t v;
1437 nni6->ni_code = ICMP6_NI_SUCCESS;
1438 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1439 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1440 v = (u_int32_t)htonl(0x0000000f);
1441 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1442 break;
1443 }
1444 case NI_QTYPE_FQDN:
1445 nni6->ni_code = ICMP6_NI_SUCCESS;
1446 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1447 sizeof(struct ip6_hdr) +
1448 sizeof(struct icmp6_nodeinfo));
1449 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1450 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1451 /*
1452 * XXX do we really have FQDN in variable "hostname"?
1453 */
1454 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1455 if (n->m_next == NULL)
1456 goto bad;
1457 /* XXX we assume that n->m_next is not a chain */
1458 if (n->m_next->m_next != NULL)
1459 goto bad;
1460 n->m_pkthdr.len += n->m_next->m_len;
1461 break;
1462 case NI_QTYPE_NODEADDR:
1463 {
1464 int lenlim, copied;
1465
1466 nni6->ni_code = ICMP6_NI_SUCCESS;
1467 n->m_pkthdr.len = n->m_len =
1468 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1469 lenlim = M_TRAILINGSPACE(n);
1470 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1471 /* XXX: reset mbuf length */
1472 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1473 sizeof(struct icmp6_nodeinfo) + copied;
1474 break;
1475 }
1476 default:
1477 break; /* XXX impossible! */
1478 }
1479
1480 nni6->ni_type = ICMP6_NI_REPLY;
1481 m_freem(m);
1482 return(n);
1483
1484 bad:
1485 m_freem(m);
1486 if (n)
1487 m_freem(n);
1488 return(NULL);
1489}
1490#undef hostnamelen
1491
1492/*
1493 * make a mbuf with DNS-encoded string. no compression support.
1494 *
1495 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1496 * treated as truncated name (two \0 at the end). this is a wild guess.
1497 */
1498static struct mbuf *
1499ni6_nametodns(name, namelen, old)
1500 const char *name;
1501 int namelen;
1502 int old; /* return pascal string if non-zero */
1503{
1504 struct mbuf *m;
1505 char *cp, *ep;
1506 const char *p, *q;
1507 int i, len, nterm;
1508
1509 if (old)
1510 len = namelen + 1;
1511 else
1512 len = MCLBYTES;
1513
1514 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1515 MGET(m, M_DONTWAIT, MT_DATA);
1516 if (m && len > MLEN) {
1517 MCLGET(m, M_DONTWAIT);
1518 if ((m->m_flags & M_EXT) == 0)
1519 goto fail;
1520 }
1521 if (!m)
1522 goto fail;
1523 m->m_next = NULL;
1524
1525 if (old) {
1526 m->m_len = len;
1527 *mtod(m, char *) = namelen;
1528 bcopy(name, mtod(m, char *) + 1, namelen);
1529 return m;
1530 } else {
1531 m->m_len = 0;
1532 cp = mtod(m, char *);
1533 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1534
1535 /* if not certain about my name, return empty buffer */
1536 if (namelen == 0)
1537 return m;
1538
1539 /*
1540 * guess if it looks like shortened hostname, or FQDN.
1541 * shortened hostname needs two trailing "\0".
1542 */
1543 i = 0;
1544 for (p = name; p < name + namelen; p++) {
1545 if (*p && *p == '.')
1546 i++;
1547 }
1548 if (i < 2)
1549 nterm = 2;
1550 else
1551 nterm = 1;
1552
1553 p = name;
1554 while (cp < ep && p < name + namelen) {
1555 i = 0;
1556 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1557 i++;
1558 /* result does not fit into mbuf */
1559 if (cp + i + 1 >= ep)
1560 goto fail;
1561 /*
1562 * DNS label length restriction, RFC1035 page 8.
1563 * "i == 0" case is included here to avoid returning
1564 * 0-length label on "foo..bar".
1565 */
1566 if (i <= 0 || i >= 64)
1567 goto fail;
1568 *cp++ = i;
1569 bcopy(p, cp, i);
1570 cp += i;
1571 p = q;
1572 if (p < name + namelen && *p == '.')
1573 p++;
1574 }
1575 /* termination */
1576 if (cp + nterm >= ep)
1577 goto fail;
1578 while (nterm-- > 0)
1579 *cp++ = '\0';
1580 m->m_len = cp - mtod(m, char *);
1581 return m;
1582 }
1583
1584 panic("should not reach here");
1585 /* NOTREACHED */
1586
1587 fail:
1588 if (m)
1589 m_freem(m);
1590 return NULL;
1591}
1592
1593/*
1594 * check if two DNS-encoded string matches. takes care of truncated
1595 * form (with \0\0 at the end). no compression support.
1596 * XXX upper/lowercase match (see RFC2065)
1597 */
1598static int
1599ni6_dnsmatch(a, alen, b, blen)
1600 const char *a;
1601 int alen;
1602 const char *b;
1603 int blen;
1604{
1605 const char *a0, *b0;
1606 int l;
1607
1608 /* simplest case - need validation? */
1609 if (alen == blen && bcmp(a, b, alen) == 0)
1610 return 1;
1611
1612 a0 = a;
1613 b0 = b;
1614
1615 /* termination is mandatory */
1616 if (alen < 2 || blen < 2)
1617 return 0;
1618 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1619 return 0;
1620 alen--;
1621 blen--;
1622
1623 while (a - a0 < alen && b - b0 < blen) {
1624 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1625 return 0;
1626
1627 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1628 return 0;
1629 /* we don't support compression yet */
1630 if (a[0] >= 64 || b[0] >= 64)
1631 return 0;
1632
1633 /* truncated case */
1634 if (a[0] == 0 && a - a0 == alen - 1)
1635 return 1;
1636 if (b[0] == 0 && b - b0 == blen - 1)
1637 return 1;
1638 if (a[0] == 0 || b[0] == 0)
1639 return 0;
1640
1641 if (a[0] != b[0])
1642 return 0;
1643 l = a[0];
1644 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1645 return 0;
1646 if (bcmp(a + 1, b + 1, l) != 0)
1647 return 0;
1648
1649 a += 1 + l;
1650 b += 1 + l;
1651 }
1652
1653 if (a - a0 == alen && b - b0 == blen)
1654 return 1;
1655 else
1656 return 0;
1657}
1658
1659/*
1660 * calculate the number of addresses to be returned in the node info reply.
1661 */
1662static int
1663ni6_addrs(ni6, m, ifpp, subj)
1664 struct icmp6_nodeinfo *ni6;
1665 struct mbuf *m;
1666 struct ifnet **ifpp;
1667 char *subj;
1668{
1669 struct ifnet *ifp;
1670 struct in6_ifaddr *ifa6;
1671 struct ifaddr *ifa;
1672 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
1673 int addrs = 0, addrsofif, iffound = 0;
1674 int niflags = ni6->ni_flags;
1675
1676 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1677 switch (ni6->ni_code) {
1678 case ICMP6_NI_SUBJ_IPV6:
1679 if (subj == NULL) /* must be impossible... */
1680 return(0);
1681 subj_ip6 = (struct sockaddr_in6 *)subj;
1682 break;
1683 default:
1684 /*
1685 * XXX: we only support IPv6 subject address for
1686 * this Qtype.
1687 */
1688 return(0);
1689 }
1690 }
1691
1692 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
1693 {
1694 addrsofif = 0;
1695 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1696 {
1697 if (ifa->ifa_addr->sa_family != AF_INET6)
1698 continue;
1699 ifa6 = (struct in6_ifaddr *)ifa;
1700
1701 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1702 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
1703 &ifa6->ia_addr.sin6_addr))
1704 iffound = 1;
1705
1706 /*
1707 * IPv4-mapped addresses can only be returned by a
1708 * Node Information proxy, since they represent
1709 * addresses of IPv4-only nodes, which perforce do
1710 * not implement this protocol.
1711 * [icmp-name-lookups-07, Section 5.4]
1712 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1713 * this function at this moment.
1714 */
1715
1716 /* What do we have to do about ::1? */
1717 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1718 case IPV6_ADDR_SCOPE_LINKLOCAL:
1719 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1720 continue;
1721 break;
1722 case IPV6_ADDR_SCOPE_SITELOCAL:
1723 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1724 continue;
1725 break;
1726 case IPV6_ADDR_SCOPE_GLOBAL:
1727 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1728 continue;
1729 break;
1730 default:
1731 continue;
1732 }
1733
1734 /*
1735 * check if anycast is okay.
1736 * XXX: just experimental. not in the spec.
1737 */
1738 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1739 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1740 continue; /* we need only unicast addresses */
1741 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1742 (icmp6_nodeinfo & 4) == 0) {
1743 continue;
1744 }
1745 addrsofif++; /* count the address */
1746 }
1747 if (iffound) {
1748 *ifpp = ifp;
1749 return(addrsofif);
1750 }
1751
1752 addrs += addrsofif;
1753 }
1754
1755 return(addrs);
1756}
1757
1758static int
1759ni6_store_addrs(ni6, nni6, ifp0, resid)
1760 struct icmp6_nodeinfo *ni6, *nni6;
1761 struct ifnet *ifp0;
1762 int resid;
1763{
1764 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet);
1765 struct in6_ifaddr *ifa6;
1766 struct ifaddr *ifa;
1767 struct ifnet *ifp_dep = NULL;
1768 int copied = 0, allow_deprecated = 0;
1769 u_char *cp = (u_char *)(nni6 + 1);
1770 int niflags = ni6->ni_flags;
1771 u_int32_t ltime;
1772
1773 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1774 return(0); /* needless to copy */
1775
1776 again:
1777
1778 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list))
1779 {
1780 for (ifa = ifp->if_addrlist.tqh_first; ifa;
1781 ifa = ifa->ifa_list.tqe_next)
1782 {
1783 if (ifa->ifa_addr->sa_family != AF_INET6)
1784 continue;
1785 ifa6 = (struct in6_ifaddr *)ifa;
1786
1787 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
1788 allow_deprecated == 0) {
1789 /*
1790 * prefererred address should be put before
1791 * deprecated addresses.
1792 */
1793
1794 /* record the interface for later search */
1795 if (ifp_dep == NULL)
1796 ifp_dep = ifp;
1797
1798 continue;
1799 }
1800 else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
1801 allow_deprecated != 0)
1802 continue; /* we now collect deprecated addrs */
1803
1804 /* What do we have to do about ::1? */
1805 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1806 case IPV6_ADDR_SCOPE_LINKLOCAL:
1807 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1808 continue;
1809 break;
1810 case IPV6_ADDR_SCOPE_SITELOCAL:
1811 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1812 continue;
1813 break;
1814 case IPV6_ADDR_SCOPE_GLOBAL:
1815 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1816 continue;
1817 break;
1818 default:
1819 continue;
1820 }
1821
1822 /*
1823 * check if anycast is okay.
1824 * XXX: just experimental. not in the spec.
1825 */
1826 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1827 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1828 continue;
1829 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1830 (icmp6_nodeinfo & 4) == 0) {
1831 continue;
1832 }
1833
1834 /* now we can copy the address */
1835 if (resid < sizeof(struct in6_addr) +
1836 sizeof(u_int32_t)) {
1837 /*
1838 * We give up much more copy.
1839 * Set the truncate flag and return.
1840 */
1841 nni6->ni_flags |=
1842 NI_NODEADDR_FLAG_TRUNCATE;
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(&ltime, 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 return(copied);
1898}
1899
1900/*
1901 * XXX almost dup'ed code with rip6_input.
1902 */
1903static int
1904icmp6_rip6_input(mp, off)
1905 struct mbuf **mp;
1906 int off;
1907{
1908 struct mbuf *m = *mp;
1909 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1910 struct in6pcb *in6p;
1911 struct in6pcb *last = NULL;
1912 struct sockaddr_in6 rip6src;
1913 struct icmp6_hdr *icmp6;
1914 struct mbuf *opts = NULL;
1915
1916#ifndef PULLDOWN_TEST
1917 /* this is assumed to be safe. */
1918 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1919#else
1920 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1921 if (icmp6 == NULL) {
1922 /* m is already reclaimed */
1923 return IPPROTO_DONE;
1924 }
1925#endif
1926
1927 bzero(&rip6src, sizeof(rip6src));
1928 rip6src.sin6_len = sizeof(struct sockaddr_in6);
1929 rip6src.sin6_family = AF_INET6;
1930 /* KAME hack: recover scopeid */
1931 (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1932
1933 LIST_FOREACH(in6p, &ripcb, inp_list)
1934 {
1935 if ((in6p->inp_vflag & INP_IPV6) == 0)
1936 continue;
1937#ifdef HAVE_NRL_INPCB
1938 if (!(in6p->in6p_flags & INP_IPV6))
1939 continue;
1940#endif
1941 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
1942 continue;
1943 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1944 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1945 continue;
1946 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1947 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1948 continue;
1949 if (in6p->in6p_icmp6filt
1950 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1951 in6p->in6p_icmp6filt))
1952 continue;
1953 if (last) {
1954 struct mbuf *n;
1955 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1956 if (last->in6p_flags & IN6P_CONTROLOPTS)
1957 ip6_savecontrol(last, &opts, ip6, n);
1958 /* strip intermediate headers */
1959 m_adj(n, off);
1960 if (sbappendaddr(&last->in6p_socket->so_rcv,
1961 (struct sockaddr *)&rip6src,
1962 n, opts) == 0) {
1963 /* should notify about lost packet */
1964 m_freem(n);
1965 if (opts) {
1966 m_freem(opts);
1967 }
1968 } else
1969 sorwakeup(last->in6p_socket);
1970 opts = NULL;
1971 }
1972 }
1973 last = in6p;
1974 }
1975 if (last) {
1976 if (last->in6p_flags & IN6P_CONTROLOPTS)
1977 ip6_savecontrol(last, &opts, ip6, m);
1978 /* strip intermediate headers */
1979 m_adj(m, off);
1980 if (sbappendaddr(&last->in6p_socket->so_rcv,
1981 (struct sockaddr *)&rip6src, m, opts) == 0) {
1982 m_freem(m);
1983 if (opts)
1984 m_freem(opts);
1985 } else
1986 sorwakeup(last->in6p_socket);
1987 } else {
1988 m_freem(m);
1989 ip6stat.ip6s_delivered--;
1990 }
1991 return IPPROTO_DONE;
1992}
1993
1994/*
1995 * Reflect the ip6 packet back to the source.
1996 * OFF points to the icmp6 header, counted from the top of the mbuf.
1997 */
1998void
1999icmp6_reflect(m, off)
2000 struct mbuf *m;
2001 size_t off;
2002{
2003 struct ip6_hdr *ip6;
2004 struct icmp6_hdr *icmp6;
2005 struct in6_ifaddr *ia;
2006 struct in6_addr t, *src = 0;
2007 int plen;
2008 int type, code;
2009 struct ifnet *outif = NULL;
2010 struct sockaddr_in6 sa6_src, sa6_dst;
2011#ifdef COMPAT_RFC1885
2012 int mtu = IPV6_MMTU;
2013 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst;
2014#endif
2015
2016 /* too short to reflect */
2017 if (off < sizeof(struct ip6_hdr)) {
2018 nd6log((LOG_DEBUG,
2019 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2020 (u_long)off, (u_long)sizeof(struct ip6_hdr),
2021 __FILE__, __LINE__));
2022 goto bad;
2023 }
2024
2025 /*
2026 * If there are extra headers between IPv6 and ICMPv6, strip
2027 * off that header first.
2028 */
2029#ifdef DIAGNOSTIC
2030 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
2031 panic("assumption failed in icmp6_reflect");
2032#endif
2033 if (off > sizeof(struct ip6_hdr)) {
2034 size_t l;
2035 struct ip6_hdr nip6;
2036
2037 l = off - sizeof(struct ip6_hdr);
2038 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2039 m_adj(m, l);
2040 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2041 if (m->m_len < l) {
2042 if ((m = m_pullup(m, l)) == NULL)
2043 return;
2044 }
2045 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2046 } else /* off == sizeof(struct ip6_hdr) */ {
2047 size_t l;
2048 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2049 if (m->m_len < l) {
2050 if ((m = m_pullup(m, l)) == NULL)
2051 return;
2052 }
2053 }
2054 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
2055 ip6 = mtod(m, struct ip6_hdr *);
2056 ip6->ip6_nxt = IPPROTO_ICMPV6;
2057 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
2058 type = icmp6->icmp6_type; /* keep type for statistics */
2059 code = icmp6->icmp6_code; /* ditto. */
2060
2061 t = ip6->ip6_dst;
2062 /*
2063 * ip6_input() drops a packet if its src is multicast.
2064 * So, the src is never multicast.
2065 */
2066 ip6->ip6_dst = ip6->ip6_src;
2067
2068 /*
2069 * XXX: make sure to embed scope zone information, using
2070 * already embedded IDs or the received interface (if any).
2071 * Note that rcvif may be NULL.
2072 * TODO: scoped routing case (XXX).
2073 */
2074 bzero(&sa6_src, sizeof(sa6_src));
2075 sa6_src.sin6_family = AF_INET6;
2076 sa6_src.sin6_len = sizeof(sa6_src);
2077 sa6_src.sin6_addr = ip6->ip6_dst;
2078 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
2079 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL);
2080 bzero(&sa6_dst, sizeof(sa6_dst));
2081 sa6_dst.sin6_family = AF_INET6;
2082 sa6_dst.sin6_len = sizeof(sa6_dst);
2083 sa6_dst.sin6_addr = t;
2084 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
2085 in6_embedscope(&t, &sa6_dst, NULL, NULL);
2086
2087#ifdef COMPAT_RFC1885
2088 /*
2089 * xxx guess MTU
2090 * RFC 1885 requires that echo reply should be truncated if it
2091 * does not fit in with (return) path MTU, but the description was
2092 * removed in the new spec.
2093 */
2094 if (icmp6_reflect_rt.ro_rt == 0 ||
2095 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) {
2096 if (icmp6_reflect_rt.ro_rt) {
2097 RTFREE(icmp6_reflect_rt.ro_rt);
2098 icmp6_reflect_rt.ro_rt = 0;
2099 }
2100 bzero(sin6, sizeof(*sin6));
2101 sin6->sin6_family = PF_INET6;
2102 sin6->sin6_len = sizeof(struct sockaddr_in6);
2103 sin6->sin6_addr = ip6->ip6_dst;
2104
2105 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt,
2106 RTF_PRCLONING);
2107 }
2108
2109 if (icmp6_reflect_rt.ro_rt == 0)
2110 goto bad;
2111
2112 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST)
2113 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu)
2114 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu;
2115
2116 if (mtu < m->m_pkthdr.len) {
2117 plen -= (m->m_pkthdr.len - mtu);
2118 m_adj(m, mtu - m->m_pkthdr.len);
2119 }
2120#endif
2121 /*
2122 * If the incoming packet was addressed directly to us(i.e. unicast),
2123 * use dst as the src for the reply.
2124 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible
2125 * (for example) when we encounter an error while forwarding procedure
2126 * destined to a duplicated address of ours.
2127 */
2128 for (ia = in6_ifaddr; ia; ia = ia->ia_next)
2129 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
2130 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2131 src = &t;
2132 break;
2133 }
2134 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
2135 /*
2136 * This is the case if the dst is our link-local address
2137 * and the sender is also ourselves.
2138 */
2139 src = &t;
2140 }
2141
2142 if (src == 0) {
2143 int e;
2144 struct route_in6 ro;
2145
2146 /*
2147 * This case matches to multicasts, our anycast, or unicasts
2148 * that we do not own. Select a source address based on the
2149 * source address of the erroneous packet.
2150 */
2151 bzero(&ro, sizeof(ro));
2152 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e);
2153 if (ro.ro_rt)
2154 RTFREE(ro.ro_rt); /* XXX: we could use this */
2155 if (src == NULL) {
2156 nd6log((LOG_DEBUG,
2157 "icmp6_reflect: source can't be determined: "
2158 "dst=%s, error=%d\n",
2159 ip6_sprintf(&sa6_src.sin6_addr), e));
2160 goto bad;
2161 }
2162 }
2163
2164 ip6->ip6_src = *src;
2165
2166 ip6->ip6_flow = 0;
2167 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2168 ip6->ip6_vfc |= IPV6_VERSION;
2169 ip6->ip6_nxt = IPPROTO_ICMPV6;
2170 if (m->m_pkthdr.rcvif) {
2171 /* XXX: This may not be the outgoing interface */
2172 ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim;
2173 } else
2174 ip6->ip6_hlim = ip6_defhlim;
2175
2176 icmp6->icmp6_cksum = 0;
2177 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2178 sizeof(struct ip6_hdr), plen);
2179
2180 /*
2181 * XXX option handling
2182 */
2183
2184 m->m_flags &= ~(M_BCAST|M_MCAST);
2185
2186#ifdef COMPAT_RFC1885
2187 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL);
2188#else
2189 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2190#endif
2191 if (outif)
2192 icmp6_ifoutstat_inc(outif, type, code);
2193
2194 return;
2195
2196 bad:
2197 m_freem(m);
2198 return;
2199}
2200
2201void
2202icmp6_fasttimo()
2203{
2204
2205 mld6_fasttimeo();
2206}
2207
2208static const char *
2209icmp6_redirect_diag(src6, dst6, tgt6)
2210 struct in6_addr *src6;
2211 struct in6_addr *dst6;
2212 struct in6_addr *tgt6;
2213{
2214 static char buf[1024];
2215 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2216 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
2217 return buf;
2218}
2219
2220void
2221icmp6_redirect_input(m, off)
2222 struct mbuf *m;
2223 int off;
2224{
2225 struct ifnet *ifp = m->m_pkthdr.rcvif;
2226 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2227 struct nd_redirect *nd_rd;
2228 int icmp6len = ntohs(ip6->ip6_plen);
2229 char *lladdr = NULL;
2230 int lladdrlen = 0;
2231 u_char *redirhdr = NULL;
2232 int redirhdrlen = 0;
2233 struct rtentry *rt = NULL;
2234 int is_router;
2235 int is_onlink;
2236 struct in6_addr src6 = ip6->ip6_src;
2237 struct in6_addr redtgt6;
2238 struct in6_addr reddst6;
2239 union nd_opts ndopts;
2240
2241 if (!m || !ifp)
2242 return;
2243
2244 /* XXX if we are router, we don't update route by icmp6 redirect */
2245 if (ip6_forwarding)
2246 goto freeit;
2247 if (!icmp6_rediraccept)
2248 goto freeit;
2249
2250#ifndef PULLDOWN_TEST
2251 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2252 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2253#else
2254 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2255 if (nd_rd == NULL) {
2256 icmp6stat.icp6s_tooshort++;
2257 return;
2258 }
2259#endif
2260 redtgt6 = nd_rd->nd_rd_target;
2261 reddst6 = nd_rd->nd_rd_dst;
2262
2263 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2264 redtgt6.s6_addr16[1] = htons(ifp->if_index);
2265 if (IN6_IS_ADDR_LINKLOCAL(&reddst6))
2266 reddst6.s6_addr16[1] = htons(ifp->if_index);
2267
2268 /* validation */
2269 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2270 nd6log((LOG_ERR,
2271 "ICMP6 redirect sent from %s rejected; "
2272 "must be from linklocal\n", ip6_sprintf(&src6)));
2273 goto bad;
2274 }
2275 if (ip6->ip6_hlim != 255) {
2276 nd6log((LOG_ERR,
2277 "ICMP6 redirect sent from %s rejected; "
2278 "hlim=%d (must be 255)\n",
2279 ip6_sprintf(&src6), ip6->ip6_hlim));
2280 goto bad;
2281 }
2282 {
2283 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2284 struct sockaddr_in6 sin6;
2285 struct in6_addr *gw6;
2286
2287 bzero(&sin6, sizeof(sin6));
2288 sin6.sin6_family = AF_INET6;
2289 sin6.sin6_len = sizeof(struct sockaddr_in6);
2290 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
2291 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
2292 if (rt) {
2293 if (rt->rt_gateway == NULL ||
2294 rt->rt_gateway->sa_family != AF_INET6) {
2295 nd6log((LOG_ERR,
2296 "ICMP6 redirect rejected; no route "
2297 "with inet6 gateway found for redirect dst: %s\n",
2298 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2299 RTFREE(rt);
2300 goto bad;
2301 }
2302
2303 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2304 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2305 nd6log((LOG_ERR,
2306 "ICMP6 redirect rejected; "
2307 "not equal to gw-for-src=%s (must be same): "
2308 "%s\n",
2309 ip6_sprintf(gw6),
2310 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2311 RTFREE(rt);
2312 goto bad;
2313 }
2314 } else {
2315 nd6log((LOG_ERR,
2316 "ICMP6 redirect rejected; "
2317 "no route found for redirect dst: %s\n",
2318 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2319 goto bad;
2320 }
2321 RTFREE(rt);
2322 rt = NULL;
2323 }
2324 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2325 nd6log((LOG_ERR,
2326 "ICMP6 redirect rejected; "
2327 "redirect dst must be unicast: %s\n",
2328 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2329 goto bad;
2330 }
2331
2332 is_router = is_onlink = 0;
2333 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2334 is_router = 1; /* router case */
2335 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2336 is_onlink = 1; /* on-link destination case */
2337 if (!is_router && !is_onlink) {
2338 nd6log((LOG_ERR,
2339 "ICMP6 redirect rejected; "
2340 "neither router case nor onlink case: %s\n",
2341 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2342 goto bad;
2343 }
2344 /* validation passed */
2345
2346 icmp6len -= sizeof(*nd_rd);
2347 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2348 if (nd6_options(&ndopts) < 0) {
2349 nd6log((LOG_INFO, "icmp6_redirect_input: "
2350 "invalid ND option, rejected: %s\n",
2351 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2352 /* nd6_options have incremented stats */
2353 goto freeit;
2354 }
2355
2356 if (ndopts.nd_opts_tgt_lladdr) {
2357 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2358 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2359 }
2360
2361 if (ndopts.nd_opts_rh) {
2362 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2363 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2364 }
2365
2366 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2367 nd6log((LOG_INFO,
2368 "icmp6_redirect_input: lladdrlen mismatch for %s "
2369 "(if %d, icmp6 packet %d): %s\n",
2370 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
2371 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2372 goto bad;
2373 }
2374
2375 /* RFC 2461 8.3 */
2376 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2377 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2378
2379 if (!is_onlink) { /* better router case. perform rtredirect. */
2380 /* perform rtredirect */
2381 struct sockaddr_in6 sdst;
2382 struct sockaddr_in6 sgw;
2383 struct sockaddr_in6 ssrc;
2384
2385 bzero(&sdst, sizeof(sdst));
2386 bzero(&sgw, sizeof(sgw));
2387 bzero(&ssrc, sizeof(ssrc));
2388 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2389 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2390 sizeof(struct sockaddr_in6);
2391 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2392 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2393 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2394 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
2395 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST,
2396 (struct sockaddr *)&ssrc,
2397 (struct rtentry **)NULL);
2398 }
2399 /* finally update cached route in each socket via pfctlinput */
2400 {
2401 struct sockaddr_in6 sdst;
2402
2403 bzero(&sdst, sizeof(sdst));
2404 sdst.sin6_family = AF_INET6;
2405 sdst.sin6_len = sizeof(struct sockaddr_in6);
2406 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2407 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2408#ifdef IPSEC
2409 key_sa_routechange((struct sockaddr *)&sdst);
2410#endif
2411 }
2412
2413 freeit:
2414 m_freem(m);
2415 return;
2416
2417 bad:
2418 icmp6stat.icp6s_badredirect++;
2419 m_freem(m);
2420}
2421
2422void
2423icmp6_redirect_output(m0, rt)
2424 struct mbuf *m0;
2425 struct rtentry *rt;
2426{
2427 struct ifnet *ifp; /* my outgoing interface */
2428 struct in6_addr *ifp_ll6;
2429 struct in6_addr *router_ll6;
2430 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2431 struct mbuf *m = NULL; /* newly allocated one */
2432 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2433 struct nd_redirect *nd_rd;
2434 size_t maxlen;
2435 u_char *p;
2436 struct ifnet *outif = NULL;
2437 struct sockaddr_in6 src_sa;
2438
2439 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2440
2441 /* if we are not router, we don't send icmp6 redirect */
2442 if (!ip6_forwarding || ip6_accept_rtadv)
2443 goto fail;
2444
2445 /* sanity check */
2446 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2447 goto fail;
2448
2449 /*
2450 * Address check:
2451 * the source address must identify a neighbor, and
2452 * the destination address must not be a multicast address
2453 * [RFC 2461, sec 8.2]
2454 */
2455 sip6 = mtod(m0, struct ip6_hdr *);
2456 bzero(&src_sa, sizeof(src_sa));
2457 src_sa.sin6_family = AF_INET6;
2458 src_sa.sin6_len = sizeof(src_sa);
2459 src_sa.sin6_addr = sip6->ip6_src;
2460 /* we don't currently use sin6_scope_id, but eventually use it */
2461 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src);
2462 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2463 goto fail;
2464 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2465 goto fail; /* what should we do here? */
2466
2467 /* rate limit */
2468 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2469 goto fail;
2470
2471 /*
2472 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2473 * we almost always ask for an mbuf cluster for simplicity.
2474 * (MHLEN < IPV6_MMTU is almost always true)
2475 */
2476#if IPV6_MMTU >= MCLBYTES
2477# error assumption failed about IPV6_MMTU and MCLBYTES
2478#endif
2479 MGETHDR(m, M_DONTWAIT, MT_HEADER);
2480 if (m && IPV6_MMTU >= MHLEN)
2481 MCLGET(m, M_DONTWAIT);
2482 if (!m)
2483 goto fail;
2484 m->m_pkthdr.rcvif = NULL;
2485 m->m_len = 0;
2486 maxlen = M_TRAILINGSPACE(m);
2487 maxlen = min(IPV6_MMTU, maxlen);
2488 /* just for safety */
2489 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2490 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2491 goto fail;
2492 }
2493
2494 {
2495 /* get ip6 linklocal address for ifp(my outgoing interface). */
2496 struct in6_ifaddr *ia;
2497 if ((ia = in6ifa_ifpforlinklocal(ifp,
2498 IN6_IFF_NOTREADY|
2499 IN6_IFF_ANYCAST)) == NULL)
2500 goto fail;
2501 ifp_ll6 = &ia->ia_addr.sin6_addr;
2502 }
2503
2504 /* get ip6 linklocal address for the router. */
2505 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2506 struct sockaddr_in6 *sin6;
2507 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2508 router_ll6 = &sin6->sin6_addr;
2509 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2510 router_ll6 = (struct in6_addr *)NULL;
2511 } else
2512 router_ll6 = (struct in6_addr *)NULL;
2513
2514 /* ip6 */
2515 ip6 = mtod(m, struct ip6_hdr *);
2516 ip6->ip6_flow = 0;
2517 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2518 ip6->ip6_vfc |= IPV6_VERSION;
2519 /* ip6->ip6_plen will be set later */
2520 ip6->ip6_nxt = IPPROTO_ICMPV6;
2521 ip6->ip6_hlim = 255;
2522 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2523 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2524 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2525
2526 /* ND Redirect */
2527 nd_rd = (struct nd_redirect *)(ip6 + 1);
2528 nd_rd->nd_rd_type = ND_REDIRECT;
2529 nd_rd->nd_rd_code = 0;
2530 nd_rd->nd_rd_reserved = 0;
2531 if (rt->rt_flags & RTF_GATEWAY) {
2532 /*
2533 * nd_rd->nd_rd_target must be a link-local address in
2534 * better router cases.
2535 */
2536 if (!router_ll6)
2537 goto fail;
2538 bcopy(router_ll6, &nd_rd->nd_rd_target,
2539 sizeof(nd_rd->nd_rd_target));
2540 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2541 sizeof(nd_rd->nd_rd_dst));
2542 } else {
2543 /* make sure redtgt == reddst */
2544 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2545 sizeof(nd_rd->nd_rd_target));
2546 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2547 sizeof(nd_rd->nd_rd_dst));
2548 }
2549
2550 p = (u_char *)(nd_rd + 1);
2551
2552 if (!router_ll6)
2553 goto nolladdropt;
2554
2555 {
2556 /* target lladdr option */
2557 struct rtentry *rt_router = NULL;
2558 int len;
2559 struct sockaddr_dl *sdl;
2560 struct nd_opt_hdr *nd_opt;
2561 char *lladdr;
2562
2563 rt_router = nd6_lookup(router_ll6, 0, ifp);
2564 if (!rt_router)
2565 goto nolladdropt;
2566 len = sizeof(*nd_opt) + ifp->if_addrlen;
2567 len = (len + 7) & ~7; /* round by 8 */
2568 /* safety check */
2569 if (len + (p - (u_char *)ip6) > maxlen)
2570 goto nolladdropt;
2571 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2572 (rt_router->rt_flags & RTF_LLINFO) &&
2573 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2574 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
2575 sdl->sdl_alen) {
2576 nd_opt = (struct nd_opt_hdr *)p;
2577 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2578 nd_opt->nd_opt_len = len >> 3;
2579 lladdr = (char *)(nd_opt + 1);
2580 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2581 p += len;
2582 }
2583 }
2584nolladdropt:;
2585
2586 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2587
2588 /* just to be safe */
2589#ifdef M_DECRYPTED /*not openbsd*/
2590 if (m0->m_flags & M_DECRYPTED)
2591 goto noredhdropt;
2592#endif
2593 if (p - (u_char *)ip6 > maxlen)
2594 goto noredhdropt;
2595
2596 {
2597 /* redirected header option */
2598 int len;
2599 struct nd_opt_rd_hdr *nd_opt_rh;
2600
2601 /*
2602 * compute the maximum size for icmp6 redirect header option.
2603 * XXX room for auth header?
2604 */
2605 len = maxlen - (p - (u_char *)ip6);
2606 len &= ~7;
2607
2608 /* This is just for simplicity. */
2609 if (m0->m_pkthdr.len != m0->m_len) {
2610 if (m0->m_next) {
2611 m_freem(m0->m_next);
2612 m0->m_next = NULL;
2613 }
2614 m0->m_pkthdr.len = m0->m_len;
2615 }
2616
2617 /*
2618 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2619 * about padding/truncate rule for the original IP packet.
2620 * From the discussion on IPv6imp in Feb 1999, the consensus was:
2621 * - "attach as much as possible" is the goal
2622 * - pad if not aligned (original size can be guessed by original
2623 * ip6 header)
2624 * Following code adds the padding if it is simple enough,
2625 * and truncates if not.
2626 */
2627 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2628 panic("assumption failed in %s:%d", __FILE__, __LINE__);
2629
2630 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2631 /* not enough room, truncate */
2632 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2633 } else {
2634 /* enough room, pad or truncate */
2635 size_t extra;
2636
2637 extra = m0->m_pkthdr.len % 8;
2638 if (extra) {
2639 /* pad if easy enough, truncate if not */
2640 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2641 /* pad */
2642 m0->m_len += (8 - extra);
2643 m0->m_pkthdr.len += (8 - extra);
2644 } else {
2645 /* truncate */
2646 m0->m_pkthdr.len -= extra;
2647 m0->m_len -= extra;
2648 }
2649 }
2650 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2651 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2652 }
2653
2654 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2655 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2656 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2657 nd_opt_rh->nd_opt_rh_len = len >> 3;
2658 p += sizeof(*nd_opt_rh);
2659 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2660
2661 /* connect m0 to m */
2662 m->m_next = m0;
2663 m->m_pkthdr.len = m->m_len + m0->m_len;
2664 }
2665noredhdropt:;
2666
2667 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src))
2668 sip6->ip6_src.s6_addr16[1] = 0;
2669 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst))
2670 sip6->ip6_dst.s6_addr16[1] = 0;
2671#if 0
2672 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
2673 ip6->ip6_src.s6_addr16[1] = 0;
2674 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
2675 ip6->ip6_dst.s6_addr16[1] = 0;
2676#endif
2677 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target))
2678 nd_rd->nd_rd_target.s6_addr16[1] = 0;
2679 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst))
2680 nd_rd->nd_rd_dst.s6_addr16[1] = 0;
2681
2682 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2683
2684 nd_rd->nd_rd_cksum = 0;
2685 nd_rd->nd_rd_cksum
2686 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2687
2688 /* send the packet to outside... */
2689 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2690 if (outif) {
2691 icmp6_ifstat_inc(outif, ifs6_out_msg);
2692 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2693 }
2694 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2695
2696 return;
2697
2698fail:
2699 if (m)
2700 m_freem(m);
2701 if (m0)
2702 m_freem(m0);
2703}
2704
2705#ifdef HAVE_NRL_INPCB
2706#define sotoin6pcb sotoinpcb
2707#define in6pcb inpcb
2708#define in6p_icmp6filt inp_icmp6filt
2709#endif
2710/*
2711 * ICMPv6 socket option processing.
2712 */
2713int
2714icmp6_ctloutput(so, sopt)
2715 struct socket *so;
2716 struct sockopt *sopt;
2717{
2718 int error = 0;
2719 int optlen;
2720 struct inpcb *inp = sotoinpcb(so);
2721 int level, op, optname;
2722
2723 if (sopt) {
2724 level = sopt->sopt_level;
2725 op = sopt->sopt_dir;
2726 optname = sopt->sopt_name;
2727 optlen = sopt->sopt_valsize;
2728 } else
2729 level = op = optname = optlen = 0;
2730
2731 if (level != IPPROTO_ICMPV6) {
2732 return EINVAL;
2733 }
2734
2735 switch (op) {
2736 case PRCO_SETOPT:
2737 switch (optname) {
2738 case ICMP6_FILTER:
2739 {
2740 struct icmp6_filter *p;
2741
2742 if (optlen != sizeof(*p)) {
2743 error = EMSGSIZE;
2744 break;
2745 }
2746 if (inp->in6p_icmp6filt == NULL) {
2747 error = EINVAL;
2748 break;
2749 }
2750 error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen,
2751 optlen);
2752 break;
2753 }
2754
2755 default:
2756 error = ENOPROTOOPT;
2757 break;
2758 }
2759 break;
2760
2761 case PRCO_GETOPT:
2762 switch (optname) {
2763 case ICMP6_FILTER:
2764 {
2765 if (inp->in6p_icmp6filt == NULL) {
2766 error = EINVAL;
2767 break;
2768 }
2769 error = sooptcopyout(sopt, inp->in6p_icmp6filt,
2770 sizeof(struct icmp6_filter));
2771 break;
2772 }
2773
2774 default:
2775 error = ENOPROTOOPT;
2776 break;
2777 }
2778 break;
2779 }
2780
2781 return(error);
2782}
2783#ifdef HAVE_NRL_INPCB
2784#undef sotoin6pcb
2785#undef in6pcb
2786#undef in6p_icmp6filt
2787#endif
2788
2789#ifndef HAVE_PPSRATECHECK
2790#ifndef timersub
2791#define timersub(tvp, uvp, vvp) \
2792 do { \
2793 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
2794 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
2795 if ((vvp)->tv_usec < 0) { \
2796 (vvp)->tv_sec--; \
2797 (vvp)->tv_usec += 1000000; \
2798 } \
2799 } while (0)
2800#endif
2801
2802/*
2803 * ppsratecheck(): packets (or events) per second limitation.
2804 */
2805static int
2806ppsratecheck(lasttime, curpps, maxpps)
2807 struct timeval *lasttime;
2808 int *curpps;
2809 int maxpps; /* maximum pps allowed */
2810{
2811 struct timeval tv, delta;
88c4d2f6 2812 int rv;
984263bc 2813
984263bc 2814 microtime(&tv);
984263bc
MD
2815
2816 timersub(&tv, lasttime, &delta);
2817
2818 /*
2819 * Check for 0,0 so that the message will be seen at least once.
2820 * If more than one second has passed since the last update of
2821 * lasttime, reset the counter.
2822 *
2823 * We do increment *curpps even in *curpps < maxpps case, as some may
2824 * try to use *curpps for stat purposes as well.
2825 */
2826 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
2827 delta.tv_sec >= 1) {
2828 *lasttime = tv;
2829 *curpps = 0;
2830 rv = 1;
2831 } else if (maxpps < 0)
2832 rv = 1;
2833 else if (*curpps < maxpps)
2834 rv = 1;
2835 else
2836 rv = 0;
2837
2838#if 1 /* DIAGNOSTIC? */
2839 /* be careful about wrap-around */
2840 if (*curpps + 1 > *curpps)
2841 *curpps = *curpps + 1;
2842#else
2843 /*
2844 * assume that there's not too many calls to this function.
2845 * not sure if the assumption holds, as it depends on *caller's*
2846 * behavior, not the behavior of this function.
2847 * IMHO it is wrong to make assumption on the caller's behavior,
2848 * so the above #if is #if 1, not #ifdef DIAGNOSTIC.
2849 */
2850 *curpps = *curpps + 1;
2851#endif
2852
2853 return (rv);
2854}
2855#endif
2856
2857/*
2858 * Perform rate limit check.
2859 * Returns 0 if it is okay to send the icmp6 packet.
2860 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2861 * limitation.
2862 *
2863 * XXX per-destination/type check necessary?
2864 */
2865static int
2866icmp6_ratelimit(dst, type, code)
2867 const struct in6_addr *dst; /* not used at this moment */
2868 const int type; /* not used at this moment */
2869 const int code; /* not used at this moment */
2870{
2871 int ret;
2872
2873 ret = 0; /* okay to send */
2874
2875 /* PPS limit */
2876 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2877 icmp6errppslim)) {
2878 /* The packet is subject to rate limit */
2879 ret++;
2880 }
2881
2882 return ret;
2883}