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<sys/cdefs.h>: Make __nonnull variadic.
[dragonfly.git] / sys / netinet6 / icmp6.c
blob4b2eb0b0aabbdbb270c7a3dc17b4f28afd258d60
1 /* $FreeBSD: src/sys/netinet6/icmp6.c,v 1.6.2.13 2003/05/06 06:46:58 suz Exp $ */
2 /* $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $ */
3
4 /*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 /*
34 * Copyright (c) 1982, 1986, 1988, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 * 3. Neither the name of the University nor the names of its contributors
46 * may be used to endorse or promote products derived from this software
47 * without specific prior written permission.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59 * SUCH DAMAGE.
60 *
61 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
62 */
63
64 #include "opt_inet.h"
65 #include "opt_inet6.h"
66 #include "opt_ipsec.h"
67
68 #include <sys/param.h>
69 #include <sys/systm.h>
70 #include <sys/malloc.h>
71 #include <sys/mbuf.h>
72 #include <sys/protosw.h>
73 #include <sys/socket.h>
74 #include <sys/socketvar.h>
75 #include <sys/socketops.h>
76 #include <sys/time.h>
77 #include <sys/kernel.h>
78 #include <sys/syslog.h>
79 #include <sys/domain.h>
80
81 #include <sys/thread2.h>
82 #include <sys/msgport2.h>
83
84 #include <net/if.h>
85 #include <net/route.h>
86 #include <net/if_dl.h>
87 #include <net/if_types.h>
88 #include <net/netisr2.h>
89 #include <net/netmsg2.h>
90
91 #include <netinet/in.h>
92 #include <netinet/in_var.h>
93 #include <netinet/ip6.h>
94 #include <netinet6/ip6_var.h>
95 #include <netinet/icmp6.h>
96 #include <netinet6/mld6_var.h>
97 #include <netinet/in_pcb.h>
98 #include <netinet6/in6_pcb.h>
99 #include <netinet6/nd6.h>
100 #include <netinet6/in6_ifattach.h>
101 #include <netinet6/ip6protosw.h>
102
103 #ifdef IPSEC
104 #include <netinet6/ipsec.h>
105 #include <netproto/key/key.h>
106 #endif
107
108 #ifdef FAST_IPSEC
109 #include <netproto/ipsec/ipsec.h>
110 #include <netproto/ipsec/key.h>
111 #define IPSEC
112 #endif
113
114 #include <net/net_osdep.h>
115
116 #ifdef HAVE_NRL_INPCB
117 /* inpcb members */
118 #define in6pcb inpcb
119 #define in6p_laddr inp_laddr6
120 #define in6p_faddr inp_faddr6
121 #define in6p_icmp6filt inp_icmp6filt
122 #define in6p_route inp_route
123 #define in6p_socket inp_socket
124 #define in6p_flags inp_flags
125 #define in6p_moptions inp_moptions6
126 #define in6p_outputopts inp_outputopts6
127 #define in6p_ip6 inp_ipv6
128 #define in6p_flowinfo inp_flowinfo
129 #define in6p_sp inp_sp
130 #define in6p_next inp_next
131 #define in6p_prev inp_prev
132 /* function names */
133 #define in6_pcbdetach in_pcbdetach
134 #define in6_rtchange in_rtchange
135
136 /*
137 * for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from
138 * others...
139 */
140 #define in6p_ip6_nxt inp_ipv6.ip6_nxt
141 #endif
142
143 #define ICMP6_FASTTIMO (hz / PR_FASTHZ)
144
145 /*
146 * ppratecheck() is available, so define it here.
147 */
148 #define HAVE_PPSRATECHECK
149
150 extern struct domain inet6domain;
151 extern struct protosw inet6sw[];
152 extern u_char ip6_protox[];
153
154 struct icmp6stat icmp6stat;
155
156 extern struct inpcbinfo ripcbinfo;
157 extern int icmp6errppslim;
158 static int icmp6errpps_count = 0;
159 static struct timeval icmp6errppslim_last;
160 extern int icmp6_nodeinfo;
161
162 static void icmp6_errcount (struct icmp6errstat *, int, int);
163 static int icmp6_rip6_input (struct mbuf **, int);
164 static int icmp6_ratelimit (const struct in6_addr *, const int, const int);
165 static const char *icmp6_redirect_diag (struct in6_addr *,
166 struct in6_addr *, struct in6_addr *);
167 #ifndef HAVE_PPSRATECHECK
168 static int ppsratecheck (struct timeval *, int *, int);
169 #endif
170 static struct mbuf *ni6_input (struct mbuf *, int);
171 static struct mbuf *ni6_nametodns (const char *, int, int);
172 static int ni6_dnsmatch (const char *, int, const char *, int);
173 static int ni6_addrs (struct icmp6_nodeinfo *, struct mbuf *,
174 struct ifnet **, char *);
175 static int ni6_store_addrs (struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
176 struct ifnet *, int);
177 static int icmp6_notify_error (struct mbuf *, int, int, int);
178
179 static void icmp6_fasttimo(void *);
180 static void icmp6_fasttimo_dispatch(netmsg_t);
181
182 #ifdef COMPAT_RFC1885
183 static struct route_in6 icmp6_reflect_rt;
184 #endif
185
186 static struct callout icmp6_fasttimo_ch;
187 static struct netmsg_base icmp6_fasttimo_nmsg;
188
189 void
190 icmp6_init(void)
191 {
192
193 mld6_init();
194
195 callout_init_mp(&icmp6_fasttimo_ch);
196 netmsg_init(&icmp6_fasttimo_nmsg, NULL, &netisr_adone_rport,
197 MSGF_PRIORITY, icmp6_fasttimo_dispatch);
198
199 callout_reset_bycpu(&icmp6_fasttimo_ch, ICMP6_FASTTIMO,
200 icmp6_fasttimo, NULL, 0);
201 }
202
203 static void
204 icmp6_errcount(struct icmp6errstat *stat, int type, int code)
205 {
206 switch (type) {
207 case ICMP6_DST_UNREACH:
208 switch (code) {
209 case ICMP6_DST_UNREACH_NOROUTE:
210 stat->icp6errs_dst_unreach_noroute++;
211 return;
212 case ICMP6_DST_UNREACH_ADMIN:
213 stat->icp6errs_dst_unreach_admin++;
214 return;
215 case ICMP6_DST_UNREACH_BEYONDSCOPE:
216 stat->icp6errs_dst_unreach_beyondscope++;
217 return;
218 case ICMP6_DST_UNREACH_ADDR:
219 stat->icp6errs_dst_unreach_addr++;
220 return;
221 case ICMP6_DST_UNREACH_NOPORT:
222 stat->icp6errs_dst_unreach_noport++;
223 return;
224 }
225 break;
226 case ICMP6_PACKET_TOO_BIG:
227 stat->icp6errs_packet_too_big++;
228 return;
229 case ICMP6_TIME_EXCEEDED:
230 switch (code) {
231 case ICMP6_TIME_EXCEED_TRANSIT:
232 stat->icp6errs_time_exceed_transit++;
233 return;
234 case ICMP6_TIME_EXCEED_REASSEMBLY:
235 stat->icp6errs_time_exceed_reassembly++;
236 return;
237 }
238 break;
239 case ICMP6_PARAM_PROB:
240 switch (code) {
241 case ICMP6_PARAMPROB_HEADER:
242 stat->icp6errs_paramprob_header++;
243 return;
244 case ICMP6_PARAMPROB_NEXTHEADER:
245 stat->icp6errs_paramprob_nextheader++;
246 return;
247 case ICMP6_PARAMPROB_OPTION:
248 stat->icp6errs_paramprob_option++;
249 return;
250 }
251 break;
252 case ND_REDIRECT:
253 stat->icp6errs_redirect++;
254 return;
255 }
256 stat->icp6errs_unknown++;
257 }
258
259 /*
260 * Generate an error packet of type error in response to bad IP6 packet.
261 */
262 void
263 icmp6_error(struct mbuf *m, int type, int code, int param)
264 {
265 struct ip6_hdr *oip6, *nip6;
266 struct icmp6_hdr *icmp6;
267 u_int preplen;
268 int off;
269 int nxt;
270
271 icmp6stat.icp6s_error++;
272
273 /* count per-type-code statistics */
274 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
275
276 #ifdef M_DECRYPTED /*not openbsd*/
277 if (m->m_flags & M_DECRYPTED) {
278 icmp6stat.icp6s_canterror++;
279 goto freeit;
280 }
281 #endif
282
283 #ifndef PULLDOWN_TEST
284 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
285 #else
286 if (m->m_len < sizeof(struct ip6_hdr)) {
287 m = m_pullup(m, sizeof(struct ip6_hdr));
288 if (m == NULL)
289 return;
290 }
291 #endif
292 oip6 = mtod(m, struct ip6_hdr *);
293
294 /*
295 * Multicast destination check. For unrecognized option errors,
296 * this check has already done in ip6_unknown_opt(), so we can
297 * check only for other errors.
298 */
299 if ((m->m_flags & (M_BCAST|M_MCAST) ||
300 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
301 (type != ICMP6_PACKET_TOO_BIG &&
302 (type != ICMP6_PARAM_PROB ||
303 code != ICMP6_PARAMPROB_OPTION)))
304 goto freeit;
305
306 /* Source address check. XXX: the case of anycast source? */
307 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
308 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
309 goto freeit;
310
311 /*
312 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
313 * don't do it.
314 */
315 nxt = -1;
316 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
317 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
318 struct icmp6_hdr *icp;
319
320 #ifndef PULLDOWN_TEST
321 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
322 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
323 #else
324 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
325 sizeof(*icp));
326 if (icp == NULL) {
327 icmp6stat.icp6s_tooshort++;
328 return;
329 }
330 #endif
331 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
332 icp->icmp6_type == ND_REDIRECT) {
333 /*
334 * ICMPv6 error
335 * Special case: for redirect (which is
336 * informational) we must not send icmp6 error.
337 */
338 icmp6stat.icp6s_canterror++;
339 goto freeit;
340 } else {
341 /* ICMPv6 informational - send the error */
342 }
343 } else {
344 /* non-ICMPv6 - send the error */
345 }
346
347 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
348
349 /* Finally, do rate limitation check. */
350 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
351 icmp6stat.icp6s_toofreq++;
352 goto freeit;
353 }
354
355 /*
356 * OK, ICMP6 can be generated.
357 */
358
359 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
360 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
361
362 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
363 M_PREPEND(m, preplen, M_NOWAIT);
364 if (m && m->m_len < preplen)
365 m = m_pullup(m, preplen);
366 if (m == NULL) {
367 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
368 return;
369 }
370
371 nip6 = mtod(m, struct ip6_hdr *);
372 nip6->ip6_src = oip6->ip6_src;
373 nip6->ip6_dst = oip6->ip6_dst;
374
375 in6_clearscope(&oip6->ip6_src);
376 in6_clearscope(&oip6->ip6_dst);
377
378 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
379 icmp6->icmp6_type = type;
380 icmp6->icmp6_code = code;
381 icmp6->icmp6_pptr = htonl((u_int32_t)param);
382
383 /*
384 * icmp6_reflect() is designed to be in the input path.
385 * icmp6_error() can be called from both input and outut path,
386 * and if we are in output path rcvif could contain bogus value.
387 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
388 * information in ip header (nip6).
389 */
390 m->m_pkthdr.rcvif = NULL;
391
392 icmp6stat.icp6s_outhist[type]++;
393 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
394
395 return;
396
397 freeit:
398 /*
399 * If we can't tell wheter or not we can generate ICMP6, free it.
400 */
401 m_freem(m);
402 }
403
404 /*
405 * Process a received ICMP6 message.
406 */
407 int
408 icmp6_input(struct mbuf **mp, int *offp, int proto)
409 {
410 struct mbuf *m = *mp, *n;
411 struct ip6_hdr *ip6, *nip6;
412 struct icmp6_hdr *icmp6, *nicmp6;
413 int off = *offp;
414 int icmp6len = m->m_pkthdr.len - *offp;
415 int code, sum, noff;
416
417 #ifndef PULLDOWN_TEST
418 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
419 /* m might change if M_LOOP. So, call mtod after this */
420 #endif
421
422 /*
423 * Locate icmp6 structure in mbuf, and check
424 * that not corrupted and of at least minimum length
425 */
426
427 ip6 = mtod(m, struct ip6_hdr *);
428 if (icmp6len < sizeof(struct icmp6_hdr)) {
429 icmp6stat.icp6s_tooshort++;
430 goto freeit;
431 }
432
433 /*
434 * calculate the checksum
435 */
436 #ifndef PULLDOWN_TEST
437 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
438 #else
439 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
440 if (icmp6 == NULL) {
441 icmp6stat.icp6s_tooshort++;
442 return IPPROTO_DONE;
443 }
444 #endif
445 code = icmp6->icmp6_code;
446
447 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
448 nd6log((LOG_ERR,
449 "ICMP6 checksum error(%d|%x) %s\n",
450 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
451 icmp6stat.icp6s_checksum++;
452 goto freeit;
453 }
454
455 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
456 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
457 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
458 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
459
460 switch (icmp6->icmp6_type) {
461 case ICMP6_DST_UNREACH:
462 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
463 switch (code) {
464 case ICMP6_DST_UNREACH_NOROUTE:
465 code = PRC_UNREACH_NET;
466 break;
467 case ICMP6_DST_UNREACH_ADMIN:
468 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
469 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
470 break;
471 case ICMP6_DST_UNREACH_ADDR:
472 code = PRC_HOSTDEAD;
473 break;
474 #ifdef COMPAT_RFC1885
475 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
476 code = PRC_UNREACH_SRCFAIL;
477 break;
478 #else
479 case ICMP6_DST_UNREACH_BEYONDSCOPE:
480 /* I mean "source address was incorrect." */
481 code = PRC_PARAMPROB;
482 break;
483 #endif
484 case ICMP6_DST_UNREACH_NOPORT:
485 code = PRC_UNREACH_PORT;
486 break;
487 default:
488 goto badcode;
489 }
490 goto deliver;
491 break;
492
493 case ICMP6_PACKET_TOO_BIG:
494 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
495 if (code != 0)
496 goto badcode;
497
498 code = PRC_MSGSIZE;
499
500 /*
501 * Updating the path MTU will be done after examining
502 * intermediate extension headers.
503 */
504 goto deliver;
505 break;
506
507 case ICMP6_TIME_EXCEEDED:
508 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
509 switch (code) {
510 case ICMP6_TIME_EXCEED_TRANSIT:
511 case ICMP6_TIME_EXCEED_REASSEMBLY:
512 code += PRC_TIMXCEED_INTRANS;
513 break;
514 default:
515 goto badcode;
516 }
517 goto deliver;
518 break;
519
520 case ICMP6_PARAM_PROB:
521 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
522 switch (code) {
523 case ICMP6_PARAMPROB_NEXTHEADER:
524 code = PRC_UNREACH_PROTOCOL;
525 break;
526 case ICMP6_PARAMPROB_HEADER:
527 case ICMP6_PARAMPROB_OPTION:
528 code = PRC_PARAMPROB;
529 break;
530 default:
531 goto badcode;
532 }
533 goto deliver;
534 break;
535
536 case ICMP6_ECHO_REQUEST:
537 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
538 if (code != 0)
539 goto badcode;
540 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
541 /* Give up remote */
542 break;
543 }
544 if ((n->m_flags & M_EXT) ||
545 n->m_len < off + sizeof(struct icmp6_hdr)) {
546 struct mbuf *n0 = n;
547 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
548 int n0len;
549
550 /*
551 * Prepare an internal mbuf. m_pullup() doesn't
552 * always copy the length we specified.
553 */
554 if (maxlen >= MCLBYTES) {
555 /* Give up remote */
556 m_freem(n0);
557 break;
558 }
559 n = m_getb(maxlen, M_NOWAIT, n0->m_type, M_PKTHDR);
560 if (n == NULL) {
561 /* Give up remote */
562 m_freem(n0);
563 break;
564 }
565 n0len = n0->m_pkthdr.len; /* save for use below */
566 M_MOVE_PKTHDR(n, n0);
567 /*
568 * Copy IPv6 and ICMPv6 only.
569 */
570 nip6 = mtod(n, struct ip6_hdr *);
571 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
572 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
573 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
574 noff = sizeof(struct ip6_hdr);
575 /* new mbuf contains only ipv6+icmpv6 headers */
576 n->m_len = noff + sizeof(struct icmp6_hdr);
577 /*
578 * Adjust mbuf. ip6_plen will be adjusted in
579 * ip6_output().
580 */
581 m_adj(n0, off + sizeof(struct icmp6_hdr));
582 /* recalculate complete packet size */
583 n->m_pkthdr.len = n0len + (noff - off);
584 n->m_next = n0;
585 } else {
586 nip6 = mtod(n, struct ip6_hdr *);
587 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off);
588 noff = off;
589 }
590 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
591 nicmp6->icmp6_code = 0;
592 if (n) {
593 icmp6stat.icp6s_reflect++;
594 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
595 icmp6_reflect(n, noff);
596 }
597 break;
598
599 case ICMP6_ECHO_REPLY:
600 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
601 if (code != 0)
602 goto badcode;
603 break;
604
605 case MLD_LISTENER_QUERY:
606 case MLD_LISTENER_REPORT:
607 if (icmp6len < sizeof(struct mld_hdr))
608 goto badlen;
609 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
610 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
611 else
612 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
613 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
614 /* give up local */
615 mld6_input(m, off);
616 m = NULL;
617 goto freeit;
618 }
619 mld6_input(n, off);
620 /* m stays. */
621 break;
622
623 case MLD_LISTENER_DONE:
624 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
625 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
626 goto badlen;
627 break; /* nothing to be done in kernel */
628
629 case MLD_MTRACE_RESP:
630 case MLD_MTRACE:
631 /* XXX: these two are experimental. not officially defind. */
632 /* XXX: per-interface statistics? */
633 break; /* just pass it to applications */
634
635 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
636 {
637 enum { WRU, FQDN } mode;
638
639 if (!icmp6_nodeinfo)
640 break;
641
642 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
643 mode = WRU;
644 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
645 mode = FQDN;
646 else
647 goto badlen;
648
649 #define hostnamelen strlen(hostname)
650 if (mode == FQDN) {
651 #ifndef PULLDOWN_TEST
652 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
653 IPPROTO_DONE);
654 #endif
655 n = m_copy(m, 0, M_COPYALL);
656 if (n)
657 n = ni6_input(n, off);
658 /* XXX meaningless if n == NULL */
659 noff = sizeof(struct ip6_hdr);
660 } else {
661 u_char *p;
662 int maxlen, maxhlen;
663
664 if ((icmp6_nodeinfo & 5) != 5)
665 break;
666
667 if (code != 0)
668 goto badcode;
669 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
670 if (maxlen >= MCLBYTES) {
671 /* Give up remote */
672 break;
673 }
674 n = m_getb(maxlen, M_NOWAIT, m->m_type, M_PKTHDR);
675 if (n == NULL) {
676 /* Give up remote */
677 break;
678 }
679 if (!m_dup_pkthdr(n, m, M_NOWAIT)) {
680 /*
681 * Previous code did a blind M_COPY_PKTHDR
682 * and said "just for rcvif". If true, then
683 * we could tolerate the dup failing (due to
684 * the deep copy of the tag chain). For now
685 * be conservative and just fail.
686 */
687 m_free(n);
688 break;
689 }
690 n->m_len = 0;
691 maxhlen = M_TRAILINGSPACE(n) - maxlen;
692 if (maxhlen > hostnamelen)
693 maxhlen = hostnamelen;
694 /*
695 * Copy IPv6 and ICMPv6 only.
696 */
697 nip6 = mtod(n, struct ip6_hdr *);
698 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
699 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
700 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
701 p = (u_char *)(nicmp6 + 1);
702 bzero(p, 4);
703 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
704 noff = sizeof(struct ip6_hdr);
705 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
706 sizeof(struct icmp6_hdr) + 4 + maxhlen;
707 nicmp6->icmp6_type = ICMP6_WRUREPLY;
708 nicmp6->icmp6_code = 0;
709 }
710 #undef hostnamelen
711 if (n) {
712 icmp6stat.icp6s_reflect++;
713 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
714 icmp6_reflect(n, noff);
715 }
716 break;
717 }
718
719 case ICMP6_WRUREPLY:
720 if (code != 0)
721 goto badcode;
722 break;
723
724 case ND_ROUTER_SOLICIT:
725 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
726 if (code != 0)
727 goto badcode;
728 if (icmp6len < sizeof(struct nd_router_solicit))
729 goto badlen;
730 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
731 /* give up local */
732 nd6_rs_input(m, off, icmp6len);
733 m = NULL;
734 goto freeit;
735 }
736 nd6_rs_input(n, off, icmp6len);
737 /* m stays. */
738 break;
739
740 case ND_ROUTER_ADVERT:
741 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
742 if (code != 0)
743 goto badcode;
744 if (icmp6len < sizeof(struct nd_router_advert))
745 goto badlen;
746 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
747 /* give up local */
748 nd6_ra_input(m, off, icmp6len);
749 m = NULL;
750 goto freeit;
751 }
752 nd6_ra_input(n, off, icmp6len);
753 /* m stays. */
754 break;
755
756 case ND_NEIGHBOR_SOLICIT:
757 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
758 if (code != 0)
759 goto badcode;
760 if (icmp6len < sizeof(struct nd_neighbor_solicit))
761 goto badlen;
762 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
763 /* give up local */
764 nd6_ns_input(m, off, icmp6len);
765 m = NULL;
766 goto freeit;
767 }
768 nd6_ns_input(n, off, icmp6len);
769 /* m stays. */
770 break;
771
772 case ND_NEIGHBOR_ADVERT:
773 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
774 if (code != 0)
775 goto badcode;
776 if (icmp6len < sizeof(struct nd_neighbor_advert))
777 goto badlen;
778 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
779 /* give up local */
780 nd6_na_input(m, off, icmp6len);
781 m = NULL;
782 goto freeit;
783 }
784 nd6_na_input(n, off, icmp6len);
785 /* m stays. */
786 break;
787
788 case ND_REDIRECT:
789 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
790 if (code != 0)
791 goto badcode;
792 if (icmp6len < sizeof(struct nd_redirect))
793 goto badlen;
794 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
795 /* give up local */
796 icmp6_redirect_input(m, off);
797 m = NULL;
798 goto freeit;
799 }
800 icmp6_redirect_input(n, off);
801 /* m stays. */
802 break;
803
804 case ICMP6_ROUTER_RENUMBERING:
805 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
806 code != ICMP6_ROUTER_RENUMBERING_RESULT)
807 goto badcode;
808 if (icmp6len < sizeof(struct icmp6_router_renum))
809 goto badlen;
810 break;
811
812 default:
813 nd6log((LOG_DEBUG,
814 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
815 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
816 ip6_sprintf(&ip6->ip6_dst),
817 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
818 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
819 /* ICMPv6 error: MUST deliver it by spec... */
820 code = PRC_NCMDS;
821 /* deliver */
822 } else {
823 /* ICMPv6 informational: MUST not deliver */
824 break;
825 }
826 deliver:
827 if (icmp6_notify_error(m, off, icmp6len, code)) {
828 /* In this case, m should've been freed. */
829 return (IPPROTO_DONE);
830 }
831 break;
832
833 badcode:
834 icmp6stat.icp6s_badcode++;
835 break;
836
837 badlen:
838 icmp6stat.icp6s_badlen++;
839 break;
840 }
841
842 /* deliver the packet to appropriate sockets */
843 icmp6_rip6_input(&m, *offp);
844
845 return IPPROTO_DONE;
846
847 freeit:
848 m_freem(m);
849 return IPPROTO_DONE;
850 }
851
852 static int
853 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code)
854 {
855 struct icmp6_hdr *icmp6;
856 struct ip6_hdr *eip6;
857 u_int32_t notifymtu;
858 struct sockaddr_in6 icmp6src, icmp6dst;
859
860 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
861 icmp6stat.icp6s_tooshort++;
862 goto freeit;
863 }
864 #ifndef PULLDOWN_TEST
865 IP6_EXTHDR_CHECK(m, off,
866 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
867 -1);
868 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
869 #else
870 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
871 sizeof(*icmp6) + sizeof(struct ip6_hdr));
872 if (icmp6 == NULL) {
873 icmp6stat.icp6s_tooshort++;
874 return (-1);
875 }
876 #endif
877 eip6 = (struct ip6_hdr *)(icmp6 + 1);
878
879 /* Detect the upper level protocol */
880 {
881 u_int8_t nxt = eip6->ip6_nxt;
882 int eoff = off + sizeof(struct icmp6_hdr) +
883 sizeof(struct ip6_hdr);
884 struct ip6ctlparam ip6cp;
885 struct in6_addr *finaldst = NULL;
886 int icmp6type = icmp6->icmp6_type;
887 struct ip6_frag *fh;
888 struct ip6_rthdr *rth;
889 int rthlen;
890
891 while (1) { /* XXX: should avoid infinite loop explicitly? */
892 struct ip6_ext *eh;
893
894 switch (nxt) {
895 case IPPROTO_HOPOPTS:
896 case IPPROTO_DSTOPTS:
897 case IPPROTO_AH:
898 #ifndef PULLDOWN_TEST
899 IP6_EXTHDR_CHECK(m, 0,
900 eoff + sizeof(struct ip6_ext), -1);
901 eh = (struct ip6_ext *)
902 (mtod(m, caddr_t) + eoff);
903 #else
904 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
905 eoff, sizeof(*eh));
906 if (eh == NULL) {
907 icmp6stat.icp6s_tooshort++;
908 return (-1);
909 }
910 #endif
911
912 if (nxt == IPPROTO_AH)
913 eoff += (eh->ip6e_len + 2) << 2;
914 else
915 eoff += (eh->ip6e_len + 1) << 3;
916 nxt = eh->ip6e_nxt;
917 break;
918 case IPPROTO_ROUTING:
919 /*
920 * When the erroneous packet contains a
921 * routing header, we should examine the
922 * header to determine the final destination.
923 * Otherwise, we can't properly update
924 * information that depends on the final
925 * destination (e.g. path MTU).
926 */
927 #ifndef PULLDOWN_TEST
928 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
929 -1);
930 rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
931 + eoff);
932 #else
933 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
934 eoff, sizeof(*rth));
935 if (rth == NULL) {
936 icmp6stat.icp6s_tooshort++;
937 return (-1);
938 }
939 #endif
940 rthlen = (rth->ip6r_len + 1) << 3;
941 eoff += rthlen;
942 nxt = rth->ip6r_nxt;
943 break;
944 case IPPROTO_FRAGMENT:
945 #ifndef PULLDOWN_TEST
946 IP6_EXTHDR_CHECK(m, 0, eoff +
947 sizeof(struct ip6_frag),
948 -1);
949 fh = (struct ip6_frag *)(mtod(m, caddr_t)
950 + eoff);
951 #else
952 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
953 eoff, sizeof(*fh));
954 if (fh == NULL) {
955 icmp6stat.icp6s_tooshort++;
956 return (-1);
957 }
958 #endif
959 /*
960 * Data after a fragment header is meaningless
961 * unless it is the first fragment, but
962 * we'll go to the notify label for path MTU
963 * discovery.
964 */
965 if (fh->ip6f_offlg & IP6F_OFF_MASK)
966 goto notify;
967
968 eoff += sizeof(struct ip6_frag);
969 nxt = fh->ip6f_nxt;
970 break;
971 default:
972 /*
973 * This case includes ESP and the No Next
974 * Header. In such cases going to the notify
975 * label does not have any meaning
976 * (i.e. pr_ctlinput will be NULL), but we go
977 * anyway since we might have to update
978 * path MTU information.
979 */
980 goto notify;
981 }
982 }
983 notify:
984 #ifndef PULLDOWN_TEST
985 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
986 #else
987 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
988 sizeof(*icmp6) + sizeof(struct ip6_hdr));
989 if (icmp6 == NULL) {
990 icmp6stat.icp6s_tooshort++;
991 return (-1);
992 }
993 #endif
994
995 eip6 = (struct ip6_hdr *)(icmp6 + 1);
996 bzero(&icmp6dst, sizeof(icmp6dst));
997 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
998 icmp6dst.sin6_family = AF_INET6;
999 if (finaldst == NULL)
1000 icmp6dst.sin6_addr = eip6->ip6_dst;
1001 else
1002 icmp6dst.sin6_addr = *finaldst;
1003 if (in6_addr2zoneid(m->m_pkthdr.rcvif, &icmp6dst.sin6_addr,
1004 &icmp6dst.sin6_scope_id))
1005 goto freeit;
1006 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst,
1007 NULL, NULL)) {
1008 /* should be impossbile */
1009 nd6log((LOG_DEBUG,
1010 "icmp6_notify_error: in6_embedscope failed\n"));
1011 goto freeit;
1012 }
1013
1014 /*
1015 * retrieve parameters from the inner IPv6 header, and convert
1016 * them into sockaddr structures.
1017 */
1018 bzero(&icmp6src, sizeof(icmp6src));
1019 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1020 icmp6src.sin6_family = AF_INET6;
1021 icmp6src.sin6_addr = eip6->ip6_src;
1022 if (in6_addr2zoneid(m->m_pkthdr.rcvif, &icmp6src.sin6_addr,
1023 &icmp6src.sin6_scope_id))
1024 goto freeit;
1025 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src,
1026 NULL, NULL)) {
1027 /* should be impossbile */
1028 nd6log((LOG_DEBUG,
1029 "icmp6_notify_error: in6_embedscope failed\n"));
1030 goto freeit;
1031 }
1032 icmp6src.sin6_flowinfo =
1033 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1034
1035 if (finaldst == NULL)
1036 finaldst = &eip6->ip6_dst;
1037 ip6cp.ip6c_m = m;
1038 ip6cp.ip6c_icmp6 = icmp6;
1039 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1040 ip6cp.ip6c_off = eoff;
1041 ip6cp.ip6c_finaldst = finaldst;
1042 ip6cp.ip6c_src = &icmp6src;
1043 ip6cp.ip6c_nxt = nxt;
1044
1045 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1046 notifymtu = ntohl(icmp6->icmp6_mtu);
1047 ip6cp.ip6c_cmdarg = (void *)&notifymtu;
1048 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1049 }
1050
1051 so_pr_ctlinput(
1052 &inet6sw[ip6_protox[nxt]],
1053 code, (struct sockaddr *)&icmp6dst, &ip6cp);
1054 }
1055 return (0);
1056
1057 freeit:
1058 m_freem(m);
1059 return (-1);
1060 }
1061
1062 void
1063 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1064 {
1065 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1066 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1067 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1068 u_int mtu = ntohl(icmp6->icmp6_mtu);
1069 struct rtentry *rt = NULL;
1070 struct sockaddr_in6 sin6;
1071
1072 if (!validated)
1073 return;
1074
1075 bzero(&sin6, sizeof(sin6));
1076 sin6.sin6_family = PF_INET6;
1077 sin6.sin6_len = sizeof(struct sockaddr_in6);
1078 sin6.sin6_addr = *dst;
1079 /* XXX normally, this won't happen */
1080 if (IN6_IS_ADDR_LINKLOCAL(dst)) {
1081 sin6.sin6_addr.s6_addr16[1] =
1082 htons(m->m_pkthdr.rcvif->if_index);
1083 }
1084 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
1085 rt = rtpurelookup((struct sockaddr *)&sin6);
1086 if (rt != NULL && (rt->rt_flags & RTF_HOST) &&
1087 !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
1088 if (mtu < IPV6_MMTU) { /* XXX */
1089 rt->rt_rmx.rmx_locks |= RTV_MTU;
1090 } else if (mtu < rt->rt_ifp->if_mtu &&
1091 rt->rt_rmx.rmx_mtu > mtu) {
1092 icmp6stat.icp6s_pmtuchg++;
1093 rt->rt_rmx.rmx_mtu = mtu;
1094 }
1095 }
1096 if (rt)
1097 --rt->rt_refcnt;
1098 }
1099
1100 /*
1101 * Process a Node Information Query packet, based on
1102 * draft-ietf-ipngwg-icmp-name-lookups-07.
1103 *
1104 * Spec incompatibilities:
1105 * - IPv6 Subject address handling
1106 * - IPv4 Subject address handling support missing
1107 * - Proxy reply (answer even if it's not for me)
1108 * - joins NI group address at in6_ifattach() time only, does not cope
1109 * with hostname changes by sethostname(3)
1110 */
1111 #define hostnamelen strlen(hostname)
1112 static struct mbuf *
1113 ni6_input(struct mbuf *m, int off)
1114 {
1115 struct icmp6_nodeinfo *ni6, *nni6;
1116 struct mbuf *n = NULL;
1117 u_int16_t qtype;
1118 int subjlen;
1119 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1120 struct ni_reply_fqdn *fqdn;
1121 int addrs; /* for NI_QTYPE_NODEADDR */
1122 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1123 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
1124 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
1125 struct ip6_hdr *ip6;
1126 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1127 char *subj = NULL;
1128 struct in6_ifaddr *ia6 = NULL;
1129
1130 ip6 = mtod(m, struct ip6_hdr *);
1131 #ifndef PULLDOWN_TEST
1132 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1133 #else
1134 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1135 if (ni6 == NULL) {
1136 /* m is already reclaimed */
1137 return NULL;
1138 }
1139 #endif
1140
1141 /*
1142 * Validate IPv6 destination address.
1143 *
1144 * The Responder must discard the Query without further processing
1145 * unless it is one of the Responder's unicast or anycast addresses, or
1146 * a link-local scope multicast address which the Responder has joined.
1147 * [icmp-name-lookups-07, Section 4.]
1148 */
1149 bzero(&sin6, sizeof(sin6));
1150 sin6.sin6_family = AF_INET6;
1151 sin6.sin6_len = sizeof(struct sockaddr_in6);
1152 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
1153 /* XXX scopeid */
1154 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) {
1155 /* unicast/anycast, fine */
1156 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
1157 (icmp6_nodeinfo & 4) == 0) {
1158 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1159 "a temporary address in %s:%d",
1160 __FILE__, __LINE__));
1161 goto bad;
1162 }
1163 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr))
1164 ; /* link-local multicast, fine */
1165 else
1166 goto bad;
1167
1168 /* validate query Subject field. */
1169 qtype = ntohs(ni6->ni_qtype);
1170 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1171 switch (qtype) {
1172 case NI_QTYPE_NOOP:
1173 case NI_QTYPE_SUPTYPES:
1174 /* 07 draft */
1175 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1176 break;
1177 /* FALLTHROUGH */
1178 case NI_QTYPE_FQDN:
1179 case NI_QTYPE_NODEADDR:
1180 switch (ni6->ni_code) {
1181 case ICMP6_NI_SUBJ_IPV6:
1182 #if ICMP6_NI_SUBJ_IPV6 != 0
1183 case 0:
1184 #endif
1185 /*
1186 * backward compatibility - try to accept 03 draft
1187 * format, where no Subject is present.
1188 */
1189 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1190 subjlen == 0) {
1191 oldfqdn++;
1192 break;
1193 }
1194 #if ICMP6_NI_SUBJ_IPV6 != 0
1195 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1196 goto bad;
1197 #endif
1198
1199 if (subjlen != sizeof(sin6.sin6_addr))
1200 goto bad;
1201
1202 /*
1203 * Validate Subject address.
1204 *
1205 * Not sure what exactly "address belongs to the node"
1206 * means in the spec, is it just unicast, or what?
1207 *
1208 * At this moment we consider Subject address as
1209 * "belong to the node" if the Subject address equals
1210 * to the IPv6 destination address; validation for
1211 * IPv6 destination address should have done enough
1212 * check for us.
1213 *
1214 * We do not do proxy at this moment.
1215 */
1216 /* m_pulldown instead of copy? */
1217 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1218 subjlen, (caddr_t)&sin6.sin6_addr);
1219 if (in6_addr2zoneid(m->m_pkthdr.rcvif,
1220 &sin6.sin6_addr, &sin6.sin6_scope_id))
1221 goto bad;
1222 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL);
1223 bzero(&sin6_d, sizeof(sin6_d));
1224 sin6_d.sin6_family = AF_INET6; /* not used, actually */
1225 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */
1226 sin6_d.sin6_addr = ip6->ip6_dst;
1227 if (in6_addr2zoneid(m->m_pkthdr.rcvif,
1228 &ip6->ip6_dst, &sin6_d.sin6_scope_id))
1229 goto bad;
1230 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL);
1231 subj = (char *)&sin6;
1232 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
1233 break;
1234
1235 /*
1236 * XXX if we are to allow other cases, we should really
1237 * be careful about scope here.
1238 * basically, we should disallow queries toward IPv6
1239 * destination X with subject Y, if scope(X) > scope(Y).
1240 * if we allow scope(X) > scope(Y), it will result in
1241 * information leakage across scope boundary.
1242 */
1243 goto bad;
1244
1245 case ICMP6_NI_SUBJ_FQDN:
1246 /*
1247 * Validate Subject name with gethostname(3).
1248 *
1249 * The behavior may need some debate, since:
1250 * - we are not sure if the node has FQDN as
1251 * hostname (returned by gethostname(3)).
1252 * - the code does wildcard match for truncated names.
1253 * however, we are not sure if we want to perform
1254 * wildcard match, if gethostname(3) side has
1255 * truncated hostname.
1256 */
1257 n = ni6_nametodns(hostname, hostnamelen, 0);
1258 if (!n || n->m_next || n->m_len == 0)
1259 goto bad;
1260 IP6_EXTHDR_GET(subj, char *, m,
1261 off + sizeof(struct icmp6_nodeinfo), subjlen);
1262 if (subj == NULL)
1263 goto bad;
1264 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1265 n->m_len)) {
1266 goto bad;
1267 }
1268 m_freem(n);
1269 n = NULL;
1270 break;
1271
1272 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1273 default:
1274 goto bad;
1275 }
1276 break;
1277 }
1278
1279 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1280 switch (qtype) {
1281 case NI_QTYPE_FQDN:
1282 if ((icmp6_nodeinfo & 1) == 0)
1283 goto bad;
1284 break;
1285 case NI_QTYPE_NODEADDR:
1286 if ((icmp6_nodeinfo & 2) == 0)
1287 goto bad;
1288 break;
1289 }
1290
1291 /* guess reply length */
1292 switch (qtype) {
1293 case NI_QTYPE_NOOP:
1294 break; /* no reply data */
1295 case NI_QTYPE_SUPTYPES:
1296 replylen += sizeof(u_int32_t);
1297 break;
1298 case NI_QTYPE_FQDN:
1299 /* XXX will append an mbuf */
1300 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1301 break;
1302 case NI_QTYPE_NODEADDR:
1303 addrs = ni6_addrs(ni6, m, &ifp, subj);
1304 if ((replylen += addrs * (sizeof(struct in6_addr) +
1305 sizeof(u_int32_t))) > MCLBYTES)
1306 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1307 break;
1308 default:
1309 /*
1310 * XXX: We must return a reply with the ICMP6 code
1311 * `unknown Qtype' in this case. However we regard the case
1312 * as an FQDN query for backward compatibility.
1313 * Older versions set a random value to this field,
1314 * so it rarely varies in the defined qtypes.
1315 * But the mechanism is not reliable...
1316 * maybe we should obsolete older versions.
1317 */
1318 qtype = NI_QTYPE_FQDN;
1319 /* XXX will append an mbuf */
1320 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1321 oldfqdn++;
1322 break;
1323 }
1324
1325 /* allocate an mbuf to reply. */
1326 if (replylen > MCLBYTES) {
1327 /*
1328 * XXX: should we try to allocate more? But MCLBYTES
1329 * is probably much larger than IPV6_MMTU...
1330 */
1331 goto bad;
1332 }
1333 n = m_getb(replylen, M_NOWAIT, m->m_type, M_PKTHDR);
1334 if (n == NULL) {
1335 m_freem(m);
1336 return (NULL);
1337 }
1338 M_MOVE_PKTHDR(n, m); /* just for recvif */
1339 n->m_pkthdr.len = n->m_len = replylen;
1340
1341 /* copy mbuf header and IPv6 + Node Information base headers */
1342 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1343 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1344 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1345
1346 /* qtype dependent procedure */
1347 switch (qtype) {
1348 case NI_QTYPE_NOOP:
1349 nni6->ni_code = ICMP6_NI_SUCCESS;
1350 nni6->ni_flags = 0;
1351 break;
1352 case NI_QTYPE_SUPTYPES:
1353 {
1354 u_int32_t v;
1355 nni6->ni_code = ICMP6_NI_SUCCESS;
1356 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1357 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1358 v = (u_int32_t)htonl(0x0000000f);
1359 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1360 break;
1361 }
1362 case NI_QTYPE_FQDN:
1363 nni6->ni_code = ICMP6_NI_SUCCESS;
1364 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1365 sizeof(struct ip6_hdr) +
1366 sizeof(struct icmp6_nodeinfo));
1367 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1368 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1369 /*
1370 * XXX do we really have FQDN in variable "hostname"?
1371 */
1372 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1373 if (n->m_next == NULL)
1374 goto bad;
1375 /* XXX we assume that n->m_next is not a chain */
1376 if (n->m_next->m_next != NULL)
1377 goto bad;
1378 n->m_pkthdr.len += n->m_next->m_len;
1379 break;
1380 case NI_QTYPE_NODEADDR:
1381 {
1382 int lenlim, copied;
1383
1384 nni6->ni_code = ICMP6_NI_SUCCESS;
1385 n->m_pkthdr.len = n->m_len =
1386 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1387 lenlim = M_TRAILINGSPACE(n);
1388 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1389 /* XXX: reset mbuf length */
1390 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1391 sizeof(struct icmp6_nodeinfo) + copied;
1392 break;
1393 }
1394 default:
1395 break; /* XXX impossible! */
1396 }
1397
1398 nni6->ni_type = ICMP6_NI_REPLY;
1399 m_freem(m);
1400 return (n);
1401
1402 bad:
1403 m_freem(m);
1404 if (n)
1405 m_freem(n);
1406 return (NULL);
1407 }
1408 #undef hostnamelen
1409
1410 /*
1411 * make a mbuf with DNS-encoded string. no compression support.
1412 *
1413 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1414 * treated as truncated name (two \0 at the end). this is a wild guess.
1415 */
1416 static struct mbuf *
1417 ni6_nametodns(const char *name, int namelen,
1418 int old) /* return pascal string if non-zero */
1419 {
1420 struct mbuf *m;
1421 char *cp, *ep;
1422 const char *p, *q;
1423 int i, len, nterm;
1424
1425 if (old)
1426 len = namelen + 1;
1427 else
1428 len = MCLBYTES;
1429
1430 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1431 m = m_getb(len, M_NOWAIT, MT_DATA, 0);
1432 if (!m)
1433 goto fail;
1434
1435 if (old) {
1436 m->m_len = len;
1437 *mtod(m, char *) = namelen;
1438 bcopy(name, mtod(m, char *) + 1, namelen);
1439 return m;
1440 } else {
1441 m->m_len = 0;
1442 cp = mtod(m, char *);
1443 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1444
1445 /* if not certain about my name, return empty buffer */
1446 if (namelen == 0)
1447 return m;
1448
1449 /*
1450 * guess if it looks like shortened hostname, or FQDN.
1451 * shortened hostname needs two trailing "\0".
1452 */
1453 i = 0;
1454 for (p = name; p < name + namelen; p++) {
1455 if (*p && *p == '.')
1456 i++;
1457 }
1458 if (i < 2)
1459 nterm = 2;
1460 else
1461 nterm = 1;
1462
1463 p = name;
1464 while (cp < ep && p < name + namelen) {
1465 i = 0;
1466 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1467 i++;
1468 /* result does not fit into mbuf */
1469 if (cp + i + 1 >= ep)
1470 goto fail;
1471 /*
1472 * DNS label length restriction, RFC1035 page 8.
1473 * "i == 0" case is included here to avoid returning
1474 * 0-length label on "foo..bar".
1475 */
1476 if (i <= 0 || i >= 64)
1477 goto fail;
1478 *cp++ = i;
1479 bcopy(p, cp, i);
1480 cp += i;
1481 p = q;
1482 if (p < name + namelen && *p == '.')
1483 p++;
1484 }
1485 /* termination */
1486 if (cp + nterm >= ep)
1487 goto fail;
1488 while (nterm-- > 0)
1489 *cp++ = '\0';
1490 m->m_len = cp - mtod(m, char *);
1491 return m;
1492 }
1493
1494 panic("should not reach here");
1495 /* NOTREACHED */
1496
1497 fail:
1498 if (m)
1499 m_freem(m);
1500 return NULL;
1501 }
1502
1503 /*
1504 * check if two DNS-encoded string matches. takes care of truncated
1505 * form (with \0\0 at the end). no compression support.
1506 * XXX upper/lowercase match (see RFC2065)
1507 */
1508 static int
1509 ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1510 {
1511 const char *a0, *b0;
1512 int l;
1513
1514 /* simplest case - need validation? */
1515 if (alen == blen && bcmp(a, b, alen) == 0)
1516 return 1;
1517
1518 a0 = a;
1519 b0 = b;
1520
1521 /* termination is mandatory */
1522 if (alen < 2 || blen < 2)
1523 return 0;
1524 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1525 return 0;
1526 alen--;
1527 blen--;
1528
1529 while (a - a0 < alen && b - b0 < blen) {
1530 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1531 return 0;
1532
1533 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1534 return 0;
1535 /* we don't support compression yet */
1536 if (a[0] >= 64 || b[0] >= 64)
1537 return 0;
1538
1539 /* truncated case */
1540 if (a[0] == 0 && a - a0 == alen - 1)
1541 return 1;
1542 if (b[0] == 0 && b - b0 == blen - 1)
1543 return 1;
1544 if (a[0] == 0 || b[0] == 0)
1545 return 0;
1546
1547 if (a[0] != b[0])
1548 return 0;
1549 l = a[0];
1550 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1551 return 0;
1552 if (bcmp(a + 1, b + 1, l) != 0)
1553 return 0;
1554
1555 a += 1 + l;
1556 b += 1 + l;
1557 }
1558
1559 if (a - a0 == alen && b - b0 == blen)
1560 return 1;
1561 else
1562 return 0;
1563 }
1564
1565 /*
1566 * calculate the number of addresses to be returned in the node info reply.
1567 */
1568 static int
1569 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
1570 char *subj)
1571 {
1572 const struct ifnet_array *arr;
1573 struct in6_ifaddr *ifa6;
1574 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
1575 int addrs = 0, addrsofif, iffound = 0;
1576 int niflags = ni6->ni_flags;
1577 int i;
1578
1579 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1580 switch (ni6->ni_code) {
1581 case ICMP6_NI_SUBJ_IPV6:
1582 if (subj == NULL) /* must be impossible... */
1583 return (0);
1584 subj_ip6 = (struct sockaddr_in6 *)subj;
1585 break;
1586 default:
1587 /*
1588 * XXX: we only support IPv6 subject address for
1589 * this Qtype.
1590 */
1591 return (0);
1592 }
1593 }
1594
1595 arr = ifnet_array_get();
1596 for (i = 0; i < arr->ifnet_count; ++i) {
1597 struct ifnet *ifp = arr->ifnet_arr[i];
1598 struct ifaddr_container *ifac;
1599
1600 addrsofif = 0;
1601 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link)
1602 {
1603 struct ifaddr *ifa = ifac->ifa;
1604
1605 if (ifa->ifa_addr->sa_family != AF_INET6)
1606 continue;
1607 ifa6 = (struct in6_ifaddr *)ifa;
1608
1609 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1610 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
1611 &ifa6->ia_addr.sin6_addr))
1612 iffound = 1;
1613
1614 /*
1615 * IPv4-mapped addresses can only be returned by a
1616 * Node Information proxy, since they represent
1617 * addresses of IPv4-only nodes, which perforce do
1618 * not implement this protocol.
1619 * [icmp-name-lookups-07, Section 5.4]
1620 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1621 * this function at this moment.
1622 */
1623
1624 /* What do we have to do about ::1? */
1625 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1626 case IPV6_ADDR_SCOPE_LINKLOCAL:
1627 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1628 continue;
1629 break;
1630 case IPV6_ADDR_SCOPE_SITELOCAL:
1631 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1632 continue;
1633 break;
1634 case IPV6_ADDR_SCOPE_GLOBAL:
1635 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1636 continue;
1637 break;
1638 default:
1639 continue;
1640 }
1641
1642 /*
1643 * check if anycast is okay.
1644 * XXX: just experimental. not in the spec.
1645 */
1646 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) &&
1647 !(niflags & NI_NODEADDR_FLAG_ANYCAST))
1648 continue; /* we need only unicast addresses */
1649 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) &&
1650 (icmp6_nodeinfo & 4) == 0) {
1651 continue;
1652 }
1653 addrsofif++; /* count the address */
1654 }
1655 if (iffound) {
1656 *ifpp = ifp;
1657 return (addrsofif);
1658 }
1659
1660 addrs += addrsofif;
1661 }
1662
1663 return (addrs);
1664 }
1665
1666 static int
1667 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
1668 struct ifnet *ifp0, int resid)
1669 {
1670 const struct ifnet_array *arr;
1671 struct in6_ifaddr *ifa6;
1672 int copied = 0, allow_deprecated = 0;
1673 u_char *cp = (u_char *)(nni6 + 1);
1674 int niflags = ni6->ni_flags;
1675 u_int32_t ltime;
1676 int idx, idx_dep = -1;
1677
1678 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1679 return (0); /* needless to copy */
1680
1681 arr = ifnet_array_get();
1682 if (ifp0 == NULL) {
1683 idx = 0;
1684 } else {
1685 for (idx = 0; idx < arr->ifnet_count; ++idx) {
1686 if (arr->ifnet_arr[idx] == ifp0)
1687 break;
1688 }
1689 }
1690
1691 again:
1692
1693 for (; idx < arr->ifnet_count; ++idx) {
1694 struct ifnet *ifp = arr->ifnet_arr[idx];
1695 struct ifaddr_container *ifac;
1696
1697 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1698 struct ifaddr *ifa = ifac->ifa;
1699
1700 if (ifa->ifa_addr->sa_family != AF_INET6)
1701 continue;
1702 ifa6 = (struct in6_ifaddr *)ifa;
1703
1704 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) &&
1705 allow_deprecated == 0) {
1706 /*
1707 * prefererred address should be put before
1708 * deprecated addresses.
1709 */
1710
1711 /* record the interface for later search */
1712 if (idx_dep < 0)
1713 idx_dep = idx;
1714
1715 continue;
1716 }
1717 else if (!(ifa6->ia6_flags & IN6_IFF_DEPRECATED) &&
1718 allow_deprecated != 0)
1719 continue; /* we now collect deprecated addrs */
1720
1721 /* What do we have to do about ::1? */
1722 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1723 case IPV6_ADDR_SCOPE_LINKLOCAL:
1724 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1725 continue;
1726 break;
1727 case IPV6_ADDR_SCOPE_SITELOCAL:
1728 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1729 continue;
1730 break;
1731 case IPV6_ADDR_SCOPE_GLOBAL:
1732 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1733 continue;
1734 break;
1735 default:
1736 continue;
1737 }
1738
1739 /*
1740 * check if anycast is okay.
1741 * XXX: just experimental. not in the spec.
1742 */
1743 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) &&
1744 !(niflags & NI_NODEADDR_FLAG_ANYCAST))
1745 continue;
1746 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) &&
1747 (icmp6_nodeinfo & 4) == 0) {
1748 continue;
1749 }
1750
1751 /* now we can copy the address */
1752 if (resid < sizeof(struct in6_addr) +
1753 sizeof(u_int32_t)) {
1754 /*
1755 * We give up much more copy.
1756 * Set the truncate flag and return.
1757 */
1758 nni6->ni_flags |=
1759 NI_NODEADDR_FLAG_TRUNCATE;
1760 return (copied);
1761 }
1762
1763 /*
1764 * Set the TTL of the address.
1765 * The TTL value should be one of the following
1766 * according to the specification:
1767 *
1768 * 1. The remaining lifetime of a DHCP lease on the
1769 * address, or
1770 * 2. The remaining Valid Lifetime of a prefix from
1771 * which the address was derived through Stateless
1772 * Autoconfiguration.
1773 *
1774 * Note that we currently do not support stateful
1775 * address configuration by DHCPv6, so the former
1776 * case can't happen.
1777 */
1778 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1779 ltime = ND6_INFINITE_LIFETIME;
1780 else {
1781 if (ifa6->ia6_lifetime.ia6t_expire >
1782 time_uptime)
1783 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime);
1784 else
1785 ltime = 0;
1786 }
1787
1788 bcopy(&ltime, cp, sizeof(u_int32_t));
1789 cp += sizeof(u_int32_t);
1790
1791 /* copy the address itself */
1792 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1793 sizeof(struct in6_addr));
1794 in6_clearscope((struct in6_addr *)cp); /* XXX */
1795 cp += sizeof(struct in6_addr);
1796
1797 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1798 copied += (sizeof(struct in6_addr) +
1799 sizeof(u_int32_t));
1800 }
1801 if (ifp0) /* we need search only on the specified IF */
1802 break;
1803 }
1804
1805 if (allow_deprecated == 0 && idx_dep >= 0) {
1806 idx = idx_dep;
1807 allow_deprecated = 1;
1808
1809 goto again;
1810 }
1811
1812 return (copied);
1813 }
1814
1815 /*
1816 * XXX almost dup'ed code with rip6_input.
1817 */
1818 static int
1819 icmp6_rip6_input(struct mbuf **mp, int off)
1820 {
1821 struct mbuf *m = *mp;
1822 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1823 struct in6pcb *in6p;
1824 struct in6pcb *last = NULL;
1825 struct sockaddr_in6 fromsa;
1826 struct icmp6_hdr *icmp6;
1827 struct mbuf *opts = NULL;
1828
1829 #ifndef PULLDOWN_TEST
1830 /* this is assumed to be safe. */
1831 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1832 #else
1833 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1834 if (icmp6 == NULL) {
1835 /* m is already reclaimed */
1836 return IPPROTO_DONE;
1837 }
1838 #endif
1839
1840 bzero(&fromsa, sizeof(fromsa));
1841 fromsa.sin6_len = sizeof(struct sockaddr_in6);
1842 fromsa.sin6_family = AF_INET6;
1843 /* KAME hack: recover scopeid */
1844 in6_recoverscope(&fromsa, &ip6->ip6_src, m->m_pkthdr.rcvif);
1845
1846 LIST_FOREACH(in6p, &ripcbinfo.pcblisthead, inp_list)
1847 {
1848 if (in6p->inp_flags & INP_PLACEMARKER)
1849 continue;
1850 if (!INP_ISIPV6(in6p))
1851 continue;
1852 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
1853 continue;
1854 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1855 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1856 continue;
1857 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1858 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1859 continue;
1860 if (in6p->in6p_icmp6filt
1861 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1862 in6p->in6p_icmp6filt))
1863 continue;
1864 if (last) {
1865 struct socket *so;
1866 struct mbuf *n;
1867
1868 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1869 if (last->in6p_flags & IN6P_CONTROLOPTS)
1870 ip6_savecontrol(last, &opts, ip6, n);
1871 /* strip intermediate headers */
1872 m_adj(n, off);
1873 so = last->in6p_socket;
1874 lwkt_gettoken(&so->so_rcv.ssb_token);
1875 if (ssb_appendaddr(&so->so_rcv,
1876 (struct sockaddr *)&fromsa, n, opts) == 0) {
1877 /* should notify about lost packet */
1878 m_freem(n);
1879 if (opts)
1880 m_freem(opts);
1881 } else {
1882 sorwakeup(so);
1883 }
1884 lwkt_reltoken(&so->so_rcv.ssb_token);
1885 opts = NULL;
1886 }
1887 }
1888 last = in6p;
1889 }
1890 if (last) {
1891 struct socket *so;
1892
1893 if (last->in6p_flags & IN6P_CONTROLOPTS)
1894 ip6_savecontrol(last, &opts, ip6, m);
1895 /* strip intermediate headers */
1896 m_adj(m, off);
1897 so = last->in6p_socket;
1898 lwkt_gettoken(&so->so_rcv.ssb_token);
1899 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&fromsa,
1900 m, opts) == 0) {
1901 m_freem(m);
1902 if (opts)
1903 m_freem(opts);
1904 } else {
1905 sorwakeup(so);
1906 }
1907 lwkt_reltoken(&so->so_rcv.ssb_token);
1908 } else {
1909 m_freem(m);
1910 ip6stat.ip6s_delivered--;
1911 }
1912 return IPPROTO_DONE;
1913 }
1914
1915 /*
1916 * Reflect the ip6 packet back to the source.
1917 * OFF points to the icmp6 header, counted from the top of the mbuf.
1918 */
1919 void
1920 icmp6_reflect(struct mbuf *m, size_t off)
1921 {
1922 struct ip6_hdr *ip6;
1923 struct icmp6_hdr *icmp6;
1924 struct in6_ifaddr *ia;
1925 struct in6_addr t, *src = NULL;
1926 int plen;
1927 int type, code;
1928 struct ifnet *outif = NULL;
1929 struct sockaddr_in6 sa6_src, sa6_dst;
1930 #ifdef COMPAT_RFC1885
1931 int mtu = IPV6_MMTU;
1932 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst;
1933 #endif
1934
1935 /* too short to reflect */
1936 if (off < sizeof(struct ip6_hdr)) {
1937 nd6log((LOG_DEBUG,
1938 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
1939 (u_long)off, (u_long)sizeof(struct ip6_hdr),
1940 __FILE__, __LINE__));
1941 goto bad;
1942 }
1943
1944 /*
1945 * If there are extra headers between IPv6 and ICMPv6, strip
1946 * off that header first.
1947 */
1948 #ifdef DIAGNOSTIC
1949 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
1950 panic("assumption failed in icmp6_reflect");
1951 #endif
1952 if (off > sizeof(struct ip6_hdr)) {
1953 size_t l;
1954 struct ip6_hdr nip6;
1955
1956 l = off - sizeof(struct ip6_hdr);
1957 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
1958 m_adj(m, l);
1959 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
1960 if (m->m_len < l) {
1961 if ((m = m_pullup(m, l)) == NULL)
1962 return;
1963 }
1964 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
1965 } else /* off == sizeof(struct ip6_hdr) */ {
1966 size_t l;
1967 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
1968 if (m->m_len < l) {
1969 if ((m = m_pullup(m, l)) == NULL)
1970 return;
1971 }
1972 }
1973 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
1974 ip6 = mtod(m, struct ip6_hdr *);
1975 ip6->ip6_nxt = IPPROTO_ICMPV6;
1976 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
1977 type = icmp6->icmp6_type; /* keep type for statistics */
1978 code = icmp6->icmp6_code; /* ditto. */
1979
1980 t = ip6->ip6_dst;
1981 /*
1982 * ip6_input() drops a packet if its src is multicast.
1983 * So, the src is never multicast.
1984 */
1985 ip6->ip6_dst = ip6->ip6_src;
1986
1987 /*
1988 * XXX: make sure to embed scope zone information, using
1989 * already embedded IDs or the received interface (if any).
1990 * Note that rcvif may be NULL.
1991 * TODO: scoped routing case (XXX).
1992 */
1993 bzero(&sa6_src, sizeof(sa6_src));
1994 sa6_src.sin6_family = AF_INET6;
1995 sa6_src.sin6_len = sizeof(sa6_src);
1996 sa6_src.sin6_addr = ip6->ip6_dst;
1997 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
1998 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL);
1999 bzero(&sa6_dst, sizeof(sa6_dst));
2000 sa6_dst.sin6_family = AF_INET6;
2001 sa6_dst.sin6_len = sizeof(sa6_dst);
2002 sa6_dst.sin6_addr = t;
2003 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
2004 in6_embedscope(&t, &sa6_dst, NULL, NULL);
2005
2006 #ifdef COMPAT_RFC1885
2007 /*
2008 * xxx guess MTU
2009 * RFC 1885 requires that echo reply should be truncated if it
2010 * does not fit in with (return) path MTU, but the description was
2011 * removed in the new spec.
2012 */
2013 if (icmp6_reflect_rt.ro_rt == 0 ||
2014 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) {
2015 if (icmp6_reflect_rt.ro_rt) {
2016 RTFREE(icmp6_reflect_rt.ro_rt);
2017 icmp6_reflect_rt.ro_rt = 0;
2018 }
2019 bzero(sin6, sizeof(*sin6));
2020 sin6->sin6_family = PF_INET6;
2021 sin6->sin6_len = sizeof(struct sockaddr_in6);
2022 sin6->sin6_addr = ip6->ip6_dst;
2023
2024 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt,
2025 RTF_PRCLONING);
2026 }
2027
2028 if (icmp6_reflect_rt.ro_rt == 0)
2029 goto bad;
2030
2031 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST)
2032 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu)
2033 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu;
2034
2035 if (mtu < m->m_pkthdr.len) {
2036 plen -= (m->m_pkthdr.len - mtu);
2037 m_adj(m, mtu - m->m_pkthdr.len);
2038 }
2039 #endif
2040 /*
2041 * If the incoming packet was addressed directly to us(i.e. unicast),
2042 * use dst as the src for the reply.
2043 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible
2044 * (for example) when we encounter an error while forwarding procedure
2045 * destined to a duplicated address of ours.
2046 */
2047 for (ia = in6_ifaddr; ia; ia = ia->ia_next)
2048 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
2049 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2050 src = &t;
2051 break;
2052 }
2053 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
2054 /*
2055 * This is the case if the dst is our link-local address
2056 * and the sender is also ourselves.
2057 */
2058 src = &t;
2059 }
2060
2061 if (src == NULL) {
2062 int e;
2063 struct route_in6 ro;
2064
2065 /*
2066 * This case matches to multicasts, our anycast, or unicasts
2067 * that we do not own. Select a source address based on the
2068 * source address of the erroneous packet.
2069 */
2070 bzero(&ro, sizeof(ro));
2071 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e, NULL);
2072 if (ro.ro_rt)
2073 RTFREE(ro.ro_rt); /* XXX: we could use this */
2074 if (src == NULL) {
2075 nd6log((LOG_DEBUG,
2076 "icmp6_reflect: source can't be determined: "
2077 "dst=%s, error=%d\n",
2078 ip6_sprintf(&sa6_src.sin6_addr), e));
2079 goto bad;
2080 }
2081 }
2082
2083 ip6->ip6_src = *src;
2084
2085 ip6->ip6_flow = 0;
2086 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2087 ip6->ip6_vfc |= IPV6_VERSION;
2088 ip6->ip6_nxt = IPPROTO_ICMPV6;
2089 if (m->m_pkthdr.rcvif) {
2090 /* XXX: This may not be the outgoing interface */
2091 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2092 if (ip6->ip6_hlim < ip6_minhlim)
2093 ip6->ip6_hlim = ip6_minhlim;
2094 } else {
2095 ip6->ip6_hlim = ip6_defhlim;
2096 }
2097
2098 icmp6->icmp6_cksum = 0;
2099 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2100 sizeof(struct ip6_hdr), plen);
2101
2102 /*
2103 * XXX option handling
2104 */
2105
2106 m->m_flags &= ~(M_BCAST|M_MCAST);
2107
2108 #ifdef COMPAT_RFC1885
2109 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL);
2110 #else
2111 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2112 #endif
2113 if (outif)
2114 icmp6_ifoutstat_inc(outif, type, code);
2115
2116 return;
2117
2118 bad:
2119 m_freem(m);
2120 return;
2121 }
2122
2123 static void
2124 icmp6_fasttimo_dispatch(netmsg_t nmsg)
2125 {
2126
2127 ASSERT_NETISR0;
2128
2129 /* Reply ASAP. */
2130 crit_enter();
2131 netisr_replymsg(&nmsg->base, 0);
2132 crit_exit();
2133
2134 mld6_fasttimeo();
2135
2136 callout_reset(&icmp6_fasttimo_ch, ICMP6_FASTTIMO, icmp6_fasttimo, NULL);
2137 }
2138
2139 static void
2140 icmp6_fasttimo(void *dummy __unused)
2141 {
2142 struct netmsg_base *nmsg = &icmp6_fasttimo_nmsg;
2143
2144 KKASSERT(mycpuid == 0);
2145
2146 crit_enter();
2147 if (nmsg->lmsg.ms_flags & MSGF_DONE)
2148 netisr_sendmsg_oncpu(nmsg);
2149 crit_exit();
2150 }
2151
2152 static const char *
2153 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
2154 struct in6_addr *tgt6)
2155 {
2156 static char buf[1024];
2157 ksnprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2158 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
2159 return buf;
2160 }
2161
2162 void
2163 icmp6_redirect_input(struct mbuf *m, int off)
2164 {
2165 struct ifnet *ifp = m->m_pkthdr.rcvif;
2166 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2167 struct nd_redirect *nd_rd;
2168 int icmp6len = ntohs(ip6->ip6_plen);
2169 char *lladdr = NULL;
2170 int lladdrlen = 0;
2171 #if 0
2172 u_char *redirhdr = NULL;
2173 int redirhdrlen = 0;
2174 #endif
2175 struct rtentry *rt = NULL;
2176 int is_router;
2177 int is_onlink;
2178 struct in6_addr src6 = ip6->ip6_src;
2179 struct in6_addr redtgt6;
2180 struct in6_addr reddst6;
2181 union nd_opts ndopts;
2182
2183 if (!m || !ifp)
2184 return;
2185
2186 /* XXX if we are router, we don't update route by icmp6 redirect */
2187 if (ip6_forwarding)
2188 goto freeit;
2189 if (!icmp6_rediraccept)
2190 goto freeit;
2191
2192 #ifndef PULLDOWN_TEST
2193 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2194 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2195 #else
2196 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2197 if (nd_rd == NULL) {
2198 icmp6stat.icp6s_tooshort++;
2199 return;
2200 }
2201 #endif
2202 redtgt6 = nd_rd->nd_rd_target;
2203 reddst6 = nd_rd->nd_rd_dst;
2204
2205 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2206 redtgt6.s6_addr16[1] = htons(ifp->if_index);
2207 if (IN6_IS_ADDR_LINKLOCAL(&reddst6))
2208 reddst6.s6_addr16[1] = htons(ifp->if_index);
2209
2210 /* validation */
2211 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2212 nd6log((LOG_ERR,
2213 "ICMP6 redirect sent from %s rejected; "
2214 "must be from linklocal\n", ip6_sprintf(&src6)));
2215 goto bad;
2216 }
2217 if (ip6->ip6_hlim != 255) {
2218 nd6log((LOG_ERR,
2219 "ICMP6 redirect sent from %s rejected; "
2220 "hlim=%d (must be 255)\n",
2221 ip6_sprintf(&src6), ip6->ip6_hlim));
2222 goto bad;
2223 }
2224 {
2225 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2226 struct sockaddr_in6 sin6;
2227 struct in6_addr *gw6;
2228
2229 bzero(&sin6, sizeof(sin6));
2230 sin6.sin6_family = AF_INET6;
2231 sin6.sin6_len = sizeof(struct sockaddr_in6);
2232 bcopy(&reddst6, &sin6.sin6_addr, sizeof reddst6);
2233 rt = rtpurelookup((struct sockaddr *)&sin6);
2234 if (rt != NULL) {
2235 if (rt->rt_gateway == NULL ||
2236 rt->rt_gateway->sa_family != AF_INET6) {
2237 nd6log((LOG_ERR,
2238 "ICMP6 redirect rejected; no route "
2239 "with inet6 gateway found for redirect dst: %s\n",
2240 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2241 --rt->rt_refcnt;
2242 goto bad;
2243 }
2244
2245 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2246 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2247 nd6log((LOG_ERR,
2248 "ICMP6 redirect rejected; "
2249 "not equal to gw-for-src=%s (must be same): "
2250 "%s\n",
2251 ip6_sprintf(gw6),
2252 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2253 --rt->rt_refcnt;
2254 goto bad;
2255 }
2256 } else {
2257 nd6log((LOG_ERR,
2258 "ICMP6 redirect rejected; "
2259 "no route found for redirect dst: %s\n",
2260 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2261 goto bad;
2262 }
2263 --rt->rt_refcnt;
2264 rt = NULL;
2265 }
2266 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2267 nd6log((LOG_ERR,
2268 "ICMP6 redirect rejected; "
2269 "redirect dst must be unicast: %s\n",
2270 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2271 goto bad;
2272 }
2273
2274 is_router = is_onlink = 0;
2275 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2276 is_router = 1; /* router case */
2277 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2278 is_onlink = 1; /* on-link destination case */
2279 if (!is_router && !is_onlink) {
2280 nd6log((LOG_ERR,
2281 "ICMP6 redirect rejected; "
2282 "neither router case nor onlink case: %s\n",
2283 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2284 goto bad;
2285 }
2286 /* validation passed */
2287
2288 icmp6len -= sizeof(*nd_rd);
2289 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2290 if (nd6_options(&ndopts) < 0) {
2291 nd6log((LOG_INFO, "icmp6_redirect_input: "
2292 "invalid ND option, rejected: %s\n",
2293 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2294 /* nd6_options have incremented stats */
2295 goto freeit;
2296 }
2297
2298 if (ndopts.nd_opts_tgt_lladdr) {
2299 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2300 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2301 }
2302
2303 #if 0
2304 if (ndopts.nd_opts_rh) {
2305 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2306 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2307 }
2308 #endif
2309
2310 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2311 nd6log((LOG_INFO,
2312 "icmp6_redirect_input: lladdrlen mismatch for %s "
2313 "(if %d, icmp6 packet %d): %s\n",
2314 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
2315 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2316 goto bad;
2317 }
2318
2319 /* RFC 2461 8.3 */
2320 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2321 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2322
2323 if (!is_onlink) { /* better router case. perform rtredirect. */
2324 /* perform rtredirect */
2325 struct sockaddr_in6 sdst;
2326 struct sockaddr_in6 sgw;
2327 struct sockaddr_in6 ssrc;
2328
2329 bzero(&sdst, sizeof(sdst));
2330 bzero(&sgw, sizeof(sgw));
2331 bzero(&ssrc, sizeof(ssrc));
2332 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2333 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2334 sizeof(struct sockaddr_in6);
2335 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2336 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2337 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2338 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
2339 NULL, RTF_GATEWAY | RTF_HOST,
2340 (struct sockaddr *)&ssrc);
2341 }
2342 /* finally update cached route in each socket via kpfctlinput */
2343 {
2344 struct sockaddr_in6 sdst;
2345
2346 bzero(&sdst, sizeof(sdst));
2347 sdst.sin6_family = AF_INET6;
2348 sdst.sin6_len = sizeof(struct sockaddr_in6);
2349 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2350 kpfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2351 #ifdef IPSEC
2352 key_sa_routechange((struct sockaddr *)&sdst);
2353 #endif
2354 }
2355
2356 freeit:
2357 m_freem(m);
2358 return;
2359
2360 bad:
2361 icmp6stat.icp6s_badredirect++;
2362 m_freem(m);
2363 }
2364
2365 void
2366 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
2367 {
2368 struct ifnet *ifp; /* my outgoing interface */
2369 struct in6_addr *ifp_ll6;
2370 struct in6_addr *router_ll6;
2371 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2372 struct mbuf *m = NULL; /* newly allocated one */
2373 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2374 struct nd_redirect *nd_rd;
2375 size_t maxlen;
2376 u_char *p;
2377 struct ifnet *outif = NULL;
2378 struct sockaddr_in6 src_sa;
2379
2380 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2381
2382 /* if we are not router, we don't send icmp6 redirect */
2383 if (!ip6_forwarding || ip6_accept_rtadv)
2384 goto fail;
2385
2386 /* sanity check */
2387 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2388 goto fail;
2389
2390 /*
2391 * Address check:
2392 * the source address must identify a neighbor, and
2393 * the destination address must not be a multicast address
2394 * [RFC 2461, sec 8.2]
2395 */
2396 sip6 = mtod(m0, struct ip6_hdr *);
2397 bzero(&src_sa, sizeof(src_sa));
2398 src_sa.sin6_family = AF_INET6;
2399 src_sa.sin6_len = sizeof(src_sa);
2400 src_sa.sin6_addr = sip6->ip6_src;
2401 /* we don't currently use sin6_scope_id, but eventually use it */
2402 if (in6_addr2zoneid(ifp, &sip6->ip6_src, &src_sa.sin6_scope_id))
2403 goto fail;
2404 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2405 goto fail;
2406 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2407 goto fail; /* what should we do here? */
2408
2409 /* rate limit */
2410 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2411 goto fail;
2412
2413 /*
2414 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2415 * we almost always ask for an mbuf cluster for simplicity.
2416 * (MHLEN < IPV6_MMTU is almost always true)
2417 */
2418 #if IPV6_MMTU >= MCLBYTES
2419 # error assumption failed about IPV6_MMTU and MCLBYTES
2420 #endif
2421 m = m_getb(IPV6_MMTU, M_NOWAIT, MT_HEADER, M_PKTHDR);
2422 if (!m)
2423 goto fail;
2424 m->m_len = 0;
2425 maxlen = M_TRAILINGSPACE(m);
2426 maxlen = min(IPV6_MMTU, maxlen);
2427 /* just for safety */
2428 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2429 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2430 goto fail;
2431 }
2432
2433 {
2434 /* get ip6 linklocal address for ifp(my outgoing interface). */
2435 struct in6_ifaddr *ia;
2436 if ((ia = in6ifa_ifpforlinklocal(ifp,
2437 IN6_IFF_NOTREADY|
2438 IN6_IFF_ANYCAST)) == NULL)
2439 goto fail;
2440 ifp_ll6 = &ia->ia_addr.sin6_addr;
2441 }
2442
2443 /* get ip6 linklocal address for the router. */
2444 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2445 struct sockaddr_in6 *sin6;
2446 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2447 router_ll6 = &sin6->sin6_addr;
2448 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2449 router_ll6 = NULL;
2450 } else
2451 router_ll6 = NULL;
2452
2453 /* ip6 */
2454 ip6 = mtod(m, struct ip6_hdr *);
2455 ip6->ip6_flow = 0;
2456 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2457 ip6->ip6_vfc |= IPV6_VERSION;
2458 /* ip6->ip6_plen will be set later */
2459 ip6->ip6_nxt = IPPROTO_ICMPV6;
2460 ip6->ip6_hlim = 255;
2461 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2462 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2463 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2464
2465 /* ND Redirect */
2466 nd_rd = (struct nd_redirect *)(ip6 + 1);
2467 nd_rd->nd_rd_type = ND_REDIRECT;
2468 nd_rd->nd_rd_code = 0;
2469 nd_rd->nd_rd_reserved = 0;
2470 if (rt->rt_flags & RTF_GATEWAY) {
2471 /*
2472 * nd_rd->nd_rd_target must be a link-local address in
2473 * better router cases.
2474 */
2475 if (!router_ll6)
2476 goto fail;
2477 bcopy(router_ll6, &nd_rd->nd_rd_target,
2478 sizeof(nd_rd->nd_rd_target));
2479 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2480 sizeof(nd_rd->nd_rd_dst));
2481 } else {
2482 /* make sure redtgt == reddst */
2483 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2484 sizeof(nd_rd->nd_rd_target));
2485 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2486 sizeof(nd_rd->nd_rd_dst));
2487 }
2488
2489 p = (u_char *)(nd_rd + 1);
2490
2491 if (!router_ll6)
2492 goto nolladdropt;
2493
2494 {
2495 /* target lladdr option */
2496 struct rtentry *rt_router = NULL;
2497 int len;
2498 struct sockaddr_dl *sdl;
2499 struct nd_opt_hdr *nd_opt;
2500 char *lladdr;
2501
2502 rt_router = nd6_lookup(router_ll6, 0, ifp);
2503 if (!rt_router)
2504 goto nolladdropt;
2505 len = sizeof(*nd_opt) + ifp->if_addrlen;
2506 len = (len + 7) & ~7; /* round by 8 */
2507 /* safety check */
2508 if (len + (p - (u_char *)ip6) > maxlen)
2509 goto nolladdropt;
2510 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2511 (rt_router->rt_flags & RTF_LLINFO) &&
2512 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2513 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
2514 sdl->sdl_alen) {
2515 nd_opt = (struct nd_opt_hdr *)p;
2516 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2517 nd_opt->nd_opt_len = len >> 3;
2518 lladdr = (char *)(nd_opt + 1);
2519 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2520 p += len;
2521 }
2522 }
2523 nolladdropt:;
2524
2525 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2526
2527 /* just to be safe */
2528 #ifdef M_DECRYPTED /*not openbsd*/
2529 if (m0->m_flags & M_DECRYPTED)
2530 goto noredhdropt;
2531 #endif
2532 if (p - (u_char *)ip6 > maxlen)
2533 goto noredhdropt;
2534
2535 {
2536 /* redirected header option */
2537 int len;
2538 struct nd_opt_rd_hdr *nd_opt_rh;
2539
2540 /*
2541 * compute the maximum size for icmp6 redirect header option.
2542 * XXX room for auth header?
2543 */
2544 len = maxlen - (p - (u_char *)ip6);
2545 len &= ~7;
2546
2547 /* This is just for simplicity. */
2548 if (m0->m_pkthdr.len != m0->m_len) {
2549 if (m0->m_next) {
2550 m_freem(m0->m_next);
2551 m0->m_next = NULL;
2552 }
2553 m0->m_pkthdr.len = m0->m_len;
2554 }
2555
2556 /*
2557 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2558 * about padding/truncate rule for the original IP packet.
2559 * From the discussion on IPv6imp in Feb 1999, the consensus was:
2560 * - "attach as much as possible" is the goal
2561 * - pad if not aligned (original size can be guessed by original
2562 * ip6 header)
2563 * Following code adds the padding if it is simple enough,
2564 * and truncates if not.
2565 */
2566 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2567 panic("assumption failed in %s:%d", __FILE__, __LINE__);
2568
2569 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2570 /* not enough room, truncate */
2571 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2572 } else {
2573 /* enough room, pad or truncate */
2574 size_t extra;
2575
2576 extra = m0->m_pkthdr.len % 8;
2577 if (extra) {
2578 /* pad if easy enough, truncate if not */
2579 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2580 /* pad */
2581 m0->m_len += (8 - extra);
2582 m0->m_pkthdr.len += (8 - extra);
2583 } else {
2584 /* truncate */
2585 m0->m_pkthdr.len -= extra;
2586 m0->m_len -= extra;
2587 }
2588 }
2589 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2590 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2591 }
2592
2593 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2594 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2595 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2596 nd_opt_rh->nd_opt_rh_len = len >> 3;
2597 p += sizeof(*nd_opt_rh);
2598 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2599
2600 /* connect m0 to m */
2601 m->m_next = m0;
2602 m->m_pkthdr.len = m->m_len + m0->m_len;
2603 m0 = NULL;
2604 }
2605 noredhdropt:;
2606 if (m0 != NULL) {
2607 m_freem(m0);
2608 m0 = NULL;
2609 }
2610
2611 /* XXX: clear embedded link IDs in the inner header */
2612 in6_clearscope(&sip6->ip6_src);
2613 in6_clearscope(&sip6->ip6_dst);
2614 in6_clearscope(&nd_rd->nd_rd_target);
2615 in6_clearscope(&nd_rd->nd_rd_dst);
2616
2617 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2618
2619 nd_rd->nd_rd_cksum = 0;
2620 nd_rd->nd_rd_cksum
2621 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2622
2623 /* send the packet to outside... */
2624 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2625 if (outif) {
2626 icmp6_ifstat_inc(outif, ifs6_out_msg);
2627 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2628 }
2629 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2630
2631 return;
2632
2633 fail:
2634 if (m)
2635 m_freem(m);
2636 if (m0)
2637 m_freem(m0);
2638 }
2639
2640 #ifdef HAVE_NRL_INPCB
2641 #define in6pcb inpcb
2642 #define in6p_icmp6filt inp_icmp6filt
2643 #endif
2644 /*
2645 * ICMPv6 socket option processing.
2646 */
2647 void
2648 icmp6_ctloutput(netmsg_t msg)
2649 {
2650 struct socket *so = msg->ctloutput.base.nm_so;
2651 struct sockopt *sopt = msg->ctloutput.nm_sopt;
2652 int error = 0;
2653 int optlen;
2654 struct inpcb *inp = so->so_pcb;
2655 int level, op, optname;
2656
2657 if (sopt) {
2658 level = sopt->sopt_level;
2659 op = sopt->sopt_dir;
2660 optname = sopt->sopt_name;
2661 optlen = sopt->sopt_valsize;
2662 } else
2663 level = op = optname = optlen = 0;
2664
2665 if (level != IPPROTO_ICMPV6) {
2666 error = EINVAL;
2667 goto out;
2668 }
2669
2670 switch (op) {
2671 case PRCO_SETOPT:
2672 switch (optname) {
2673 case ICMP6_FILTER:
2674 {
2675 if (optlen != sizeof(struct icmp6_filter)) {
2676 error = EMSGSIZE;
2677 break;
2678 }
2679 if (inp->in6p_icmp6filt == NULL) {
2680 error = EINVAL;
2681 break;
2682 }
2683 error = soopt_to_kbuf(sopt, inp->in6p_icmp6filt, optlen,
2684 optlen);
2685 break;
2686 }
2687
2688 default:
2689 error = ENOPROTOOPT;
2690 break;
2691 }
2692 break;
2693
2694 case PRCO_GETOPT:
2695 switch (optname) {
2696 case ICMP6_FILTER:
2697 {
2698 if (inp->in6p_icmp6filt == NULL) {
2699 error = EINVAL;
2700 break;
2701 }
2702 soopt_from_kbuf(sopt, inp->in6p_icmp6filt,
2703 sizeof(struct icmp6_filter));
2704 break;
2705 }
2706
2707 default:
2708 error = ENOPROTOOPT;
2709 break;
2710 }
2711 break;
2712 }
2713 out:
2714 lwkt_replymsg(&msg->ctloutput.base.lmsg, error);
2715 }
2716 #ifdef HAVE_NRL_INPCB
2717 #undef in6pcb
2718 #undef in6p_icmp6filt
2719 #endif
2720
2721 #ifndef HAVE_PPSRATECHECK
2722 #ifndef timersub
2723 #define timersub(tvp, uvp, vvp) \
2724 do { \
2725 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
2726 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
2727 if ((vvp)->tv_usec < 0) { \
2728 (vvp)->tv_sec--; \
2729 (vvp)->tv_usec += 1000000; \
2730 } \
2731 } while (0)
2732 #endif
2733
2734 /*
2735 * ppsratecheck(): packets (or events) per second limitation.
2736 */
2737 static int
2738 ppsratecheck(struct timeval *lasttime, int *curpps,
2739 int maxpps) /* maximum pps allowed */
2740 {
2741 struct timeval tv, delta;
2742 int rv;
2743
2744 microtime(&tv);
2745
2746 timersub(&tv, lasttime, &delta);
2747
2748 /*
2749 * Check for 0,0 so that the message will be seen at least once.
2750 * If more than one second has passed since the last update of
2751 * lasttime, reset the counter.
2752 *
2753 * We do increment *curpps even in *curpps < maxpps case, as some may
2754 * try to use *curpps for stat purposes as well.
2755 */
2756 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
2757 delta.tv_sec >= 1) {
2758 *lasttime = tv;
2759 *curpps = 0;
2760 rv = 1;
2761 } else if (maxpps < 0)
2762 rv = 1;
2763 else if (*curpps < maxpps)
2764 rv = 1;
2765 else
2766 rv = 0;
2767
2768 #if 1 /* DIAGNOSTIC? */
2769 /* be careful about wrap-around */
2770 if (*curpps + 1 > *curpps)
2771 *curpps = *curpps + 1;
2772 #else
2773 /*
2774 * assume that there's not too many calls to this function.
2775 * not sure if the assumption holds, as it depends on *caller's*
2776 * behavior, not the behavior of this function.
2777 * IMHO it is wrong to make assumption on the caller's behavior,
2778 * so the above #if is #if 1, not #ifdef DIAGNOSTIC.
2779 */
2780 *curpps = *curpps + 1;
2781 #endif
2782
2783 return (rv);
2784 }
2785 #endif
2786
2787 /*
2788 * Perform rate limit check.
2789 * Returns 0 if it is okay to send the icmp6 packet.
2790 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2791 * limitation.
2792 *
2793 * XXX per-destination/type check necessary?
2794 */
2795 static int
2796 icmp6_ratelimit(const struct in6_addr *dst, /* not used at this moment */
2797 const int type, /* not used at this moment */
2798 const int code) /* not used at this moment */
2799 {
2800 int ret;
2801
2802 ret = 0; /* okay to send */
2803
2804 /* PPS limit */
2805 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2806 icmp6errppslim)) {
2807 /* The packet is subject to rate limit */
2808 ret++;
2809 }
2810
2811 return ret;
2812 }
DragonFly BSD