?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
The result of the "RFC3542 support" SoC project by Dashu Huang.
[dragonfly.git] / sys / netinet6 / icmp6.c
blobb94d0de03c7adebd94e754bf69af949915dce975
1 /* $FreeBSD: src/sys/netinet6/icmp6.c,v 1.6.2.13 2003/05/06 06:46:58 suz Exp $ */
2 /* $DragonFly: src/sys/netinet6/icmp6.c,v 1.30 2008/09/04 09:08:22 hasso Exp $ */
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>
104 #include <netproto/key/key.h>
105 #endif
106
107 #ifdef FAST_IPSEC
108 #include <netproto/ipsec/ipsec.h>
109 #include <netproto/ipsec/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 /* function names */
132 #define in6_pcbdetach in_pcbdetach
133 #define in6_rtchange in_rtchange
134
135 /*
136 * for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from
137 * others...
138 */
139 #define in6p_ip6_nxt inp_ipv6.ip6_nxt
140 #endif
141
142 /*
143 * ppratecheck() is available, so define it here.
144 */
145 #define HAVE_PPSRATECHECK
146
147 extern struct domain inet6domain;
148 extern struct ip6protosw inet6sw[];
149 extern u_char ip6_protox[];
150
151 struct icmp6stat icmp6stat;
152
153 extern struct inpcbinfo ripcbinfo;
154 extern int icmp6errppslim;
155 static int icmp6errpps_count = 0;
156 static struct timeval icmp6errppslim_last;
157 extern int icmp6_nodeinfo;
158
159 static void icmp6_errcount (struct icmp6errstat *, int, int);
160 static int icmp6_rip6_input (struct mbuf **, int);
161 static int icmp6_ratelimit (const struct in6_addr *, const int, const int);
162 static const char *icmp6_redirect_diag (struct in6_addr *,
163 struct in6_addr *, struct in6_addr *);
164 #ifndef HAVE_PPSRATECHECK
165 static int ppsratecheck (struct timeval *, int *, int);
166 #endif
167 static struct mbuf *ni6_input (struct mbuf *, int);
168 static struct mbuf *ni6_nametodns (const char *, int, int);
169 static int ni6_dnsmatch (const char *, int, const char *, int);
170 static int ni6_addrs (struct icmp6_nodeinfo *, struct mbuf *,
171 struct ifnet **, char *);
172 static int ni6_store_addrs (struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
173 struct ifnet *, int);
174 static int icmp6_notify_error (struct mbuf *, int, int, int);
175
176 #ifdef COMPAT_RFC1885
177 static struct route_in6 icmp6_reflect_rt;
178 #endif
179
180
181 void
182 icmp6_init(void)
183 {
184 mld6_init();
185 }
186
187 static void
188 icmp6_errcount(struct icmp6errstat *stat, int type, int code)
189 {
190 switch (type) {
191 case ICMP6_DST_UNREACH:
192 switch (code) {
193 case ICMP6_DST_UNREACH_NOROUTE:
194 stat->icp6errs_dst_unreach_noroute++;
195 return;
196 case ICMP6_DST_UNREACH_ADMIN:
197 stat->icp6errs_dst_unreach_admin++;
198 return;
199 case ICMP6_DST_UNREACH_BEYONDSCOPE:
200 stat->icp6errs_dst_unreach_beyondscope++;
201 return;
202 case ICMP6_DST_UNREACH_ADDR:
203 stat->icp6errs_dst_unreach_addr++;
204 return;
205 case ICMP6_DST_UNREACH_NOPORT:
206 stat->icp6errs_dst_unreach_noport++;
207 return;
208 }
209 break;
210 case ICMP6_PACKET_TOO_BIG:
211 stat->icp6errs_packet_too_big++;
212 return;
213 case ICMP6_TIME_EXCEEDED:
214 switch (code) {
215 case ICMP6_TIME_EXCEED_TRANSIT:
216 stat->icp6errs_time_exceed_transit++;
217 return;
218 case ICMP6_TIME_EXCEED_REASSEMBLY:
219 stat->icp6errs_time_exceed_reassembly++;
220 return;
221 }
222 break;
223 case ICMP6_PARAM_PROB:
224 switch (code) {
225 case ICMP6_PARAMPROB_HEADER:
226 stat->icp6errs_paramprob_header++;
227 return;
228 case ICMP6_PARAMPROB_NEXTHEADER:
229 stat->icp6errs_paramprob_nextheader++;
230 return;
231 case ICMP6_PARAMPROB_OPTION:
232 stat->icp6errs_paramprob_option++;
233 return;
234 }
235 break;
236 case ND_REDIRECT:
237 stat->icp6errs_redirect++;
238 return;
239 }
240 stat->icp6errs_unknown++;
241 }
242
243 /*
244 * Generate an error packet of type error in response to bad IP6 packet.
245 */
246 void
247 icmp6_error(struct mbuf *m, int type, int code, int param)
248 {
249 struct ip6_hdr *oip6, *nip6;
250 struct icmp6_hdr *icmp6;
251 u_int preplen;
252 int off;
253 int nxt;
254
255 icmp6stat.icp6s_error++;
256
257 /* count per-type-code statistics */
258 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
259
260 #ifdef M_DECRYPTED /*not openbsd*/
261 if (m->m_flags & M_DECRYPTED) {
262 icmp6stat.icp6s_canterror++;
263 goto freeit;
264 }
265 #endif
266
267 #ifndef PULLDOWN_TEST
268 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
269 #else
270 if (m->m_len < sizeof(struct ip6_hdr)) {
271 m = m_pullup(m, sizeof(struct ip6_hdr));
272 if (m == NULL)
273 return;
274 }
275 #endif
276 oip6 = mtod(m, struct ip6_hdr *);
277
278 /*
279 * Multicast destination check. For unrecognized option errors,
280 * this check has already done in ip6_unknown_opt(), so we can
281 * check only for other errors.
282 */
283 if ((m->m_flags & (M_BCAST|M_MCAST) ||
284 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
285 (type != ICMP6_PACKET_TOO_BIG &&
286 (type != ICMP6_PARAM_PROB ||
287 code != ICMP6_PARAMPROB_OPTION)))
288 goto freeit;
289
290 /* Source address check. XXX: the case of anycast source? */
291 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
292 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
293 goto freeit;
294
295 /*
296 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
297 * don't do it.
298 */
299 nxt = -1;
300 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
301 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
302 struct icmp6_hdr *icp;
303
304 #ifndef PULLDOWN_TEST
305 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
306 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
307 #else
308 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
309 sizeof(*icp));
310 if (icp == NULL) {
311 icmp6stat.icp6s_tooshort++;
312 return;
313 }
314 #endif
315 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
316 icp->icmp6_type == ND_REDIRECT) {
317 /*
318 * ICMPv6 error
319 * Special case: for redirect (which is
320 * informational) we must not send icmp6 error.
321 */
322 icmp6stat.icp6s_canterror++;
323 goto freeit;
324 } else {
325 /* ICMPv6 informational - send the error */
326 }
327 } else {
328 /* non-ICMPv6 - send the error */
329 }
330
331 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
332
333 /* Finally, do rate limitation check. */
334 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
335 icmp6stat.icp6s_toofreq++;
336 goto freeit;
337 }
338
339 /*
340 * OK, ICMP6 can be generated.
341 */
342
343 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
344 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
345
346 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
347 M_PREPEND(m, preplen, MB_DONTWAIT);
348 if (m && m->m_len < preplen)
349 m = m_pullup(m, preplen);
350 if (m == NULL) {
351 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
352 return;
353 }
354
355 nip6 = mtod(m, struct ip6_hdr *);
356 nip6->ip6_src = oip6->ip6_src;
357 nip6->ip6_dst = oip6->ip6_dst;
358
359 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
360 oip6->ip6_src.s6_addr16[1] = 0;
361 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
362 oip6->ip6_dst.s6_addr16[1] = 0;
363
364 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
365 icmp6->icmp6_type = type;
366 icmp6->icmp6_code = code;
367 icmp6->icmp6_pptr = htonl((u_int32_t)param);
368
369 /*
370 * icmp6_reflect() is designed to be in the input path.
371 * icmp6_error() can be called from both input and outut path,
372 * and if we are in output path rcvif could contain bogus value.
373 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
374 * information in ip header (nip6).
375 */
376 m->m_pkthdr.rcvif = NULL;
377
378 icmp6stat.icp6s_outhist[type]++;
379 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
380
381 return;
382
383 freeit:
384 /*
385 * If we can't tell wheter or not we can generate ICMP6, free it.
386 */
387 m_freem(m);
388 }
389
390 /*
391 * Process a received ICMP6 message.
392 */
393 int
394 icmp6_input(struct mbuf **mp, int *offp, int proto)
395 {
396 struct mbuf *m = *mp, *n;
397 struct ip6_hdr *ip6, *nip6;
398 struct icmp6_hdr *icmp6, *nicmp6;
399 int off = *offp;
400 int icmp6len = m->m_pkthdr.len - *offp;
401 int code, sum, noff;
402
403 #ifndef PULLDOWN_TEST
404 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
405 /* m might change if M_LOOP. So, call mtod after this */
406 #endif
407
408 /*
409 * Locate icmp6 structure in mbuf, and check
410 * that not corrupted and of at least minimum length
411 */
412
413 ip6 = mtod(m, struct ip6_hdr *);
414 if (icmp6len < sizeof(struct icmp6_hdr)) {
415 icmp6stat.icp6s_tooshort++;
416 goto freeit;
417 }
418
419 /*
420 * calculate the checksum
421 */
422 #ifndef PULLDOWN_TEST
423 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
424 #else
425 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
426 if (icmp6 == NULL) {
427 icmp6stat.icp6s_tooshort++;
428 return IPPROTO_DONE;
429 }
430 #endif
431 code = icmp6->icmp6_code;
432
433 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
434 nd6log((LOG_ERR,
435 "ICMP6 checksum error(%d|%x) %s\n",
436 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
437 icmp6stat.icp6s_checksum++;
438 goto freeit;
439 }
440
441 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
442 /*
443 * Deliver very specific ICMP6 type only.
444 * This is important to deilver TOOBIG. Otherwise PMTUD
445 * will not work.
446 */
447 switch (icmp6->icmp6_type) {
448 case ICMP6_DST_UNREACH:
449 case ICMP6_PACKET_TOO_BIG:
450 case ICMP6_TIME_EXCEEDED:
451 break;
452 default:
453 goto freeit;
454 }
455 }
456
457 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
458 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
459 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
460 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
461
462 switch (icmp6->icmp6_type) {
463 case ICMP6_DST_UNREACH:
464 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
465 switch (code) {
466 case ICMP6_DST_UNREACH_NOROUTE:
467 code = PRC_UNREACH_NET;
468 break;
469 case ICMP6_DST_UNREACH_ADMIN:
470 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
471 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
472 break;
473 case ICMP6_DST_UNREACH_ADDR:
474 code = PRC_HOSTDEAD;
475 break;
476 #ifdef COMPAT_RFC1885
477 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
478 code = PRC_UNREACH_SRCFAIL;
479 break;
480 #else
481 case ICMP6_DST_UNREACH_BEYONDSCOPE:
482 /* I mean "source address was incorrect." */
483 code = PRC_PARAMPROB;
484 break;
485 #endif
486 case ICMP6_DST_UNREACH_NOPORT:
487 code = PRC_UNREACH_PORT;
488 break;
489 default:
490 goto badcode;
491 }
492 goto deliver;
493 break;
494
495 case ICMP6_PACKET_TOO_BIG:
496 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
497 if (code != 0)
498 goto badcode;
499
500 code = PRC_MSGSIZE;
501
502 /*
503 * Updating the path MTU will be done after examining
504 * intermediate extension headers.
505 */
506 goto deliver;
507 break;
508
509 case ICMP6_TIME_EXCEEDED:
510 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
511 switch (code) {
512 case ICMP6_TIME_EXCEED_TRANSIT:
513 case ICMP6_TIME_EXCEED_REASSEMBLY:
514 code += PRC_TIMXCEED_INTRANS;
515 break;
516 default:
517 goto badcode;
518 }
519 goto deliver;
520 break;
521
522 case ICMP6_PARAM_PROB:
523 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
524 switch (code) {
525 case ICMP6_PARAMPROB_NEXTHEADER:
526 code = PRC_UNREACH_PROTOCOL;
527 break;
528 case ICMP6_PARAMPROB_HEADER:
529 case ICMP6_PARAMPROB_OPTION:
530 code = PRC_PARAMPROB;
531 break;
532 default:
533 goto badcode;
534 }
535 goto deliver;
536 break;
537
538 case ICMP6_ECHO_REQUEST:
539 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
540 if (code != 0)
541 goto badcode;
542 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
543 /* Give up remote */
544 break;
545 }
546 if ((n->m_flags & M_EXT) ||
547 n->m_len < off + sizeof(struct icmp6_hdr)) {
548 struct mbuf *n0 = n;
549 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
550 int n0len;
551
552 /*
553 * Prepare an internal mbuf. m_pullup() doesn't
554 * always copy the length we specified.
555 */
556 if (maxlen >= MCLBYTES) {
557 /* Give up remote */
558 m_freem(n0);
559 break;
560 }
561 n = m_getb(maxlen, MB_DONTWAIT, n0->m_type, M_PKTHDR);
562 if (n == NULL) {
563 /* Give up remote */
564 m_freem(n0);
565 break;
566 }
567 n0len = n0->m_pkthdr.len; /* save for use below */
568 M_MOVE_PKTHDR(n, n0);
569 /*
570 * Copy IPv6 and ICMPv6 only.
571 */
572 nip6 = mtod(n, struct ip6_hdr *);
573 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
574 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
575 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
576 noff = sizeof(struct ip6_hdr);
577 /* new mbuf contains only ipv6+icmpv6 headers */
578 n->m_len = noff + sizeof(struct icmp6_hdr);
579 /*
580 * Adjust mbuf. ip6_plen will be adjusted in
581 * ip6_output().
582 */
583 m_adj(n0, off + sizeof(struct icmp6_hdr));
584 /* recalculate complete packet size */
585 n->m_pkthdr.len = n0len + (noff - off);
586 n->m_next = n0;
587 } else {
588 nip6 = mtod(n, struct ip6_hdr *);
589 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off);
590 noff = off;
591 }
592 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
593 nicmp6->icmp6_code = 0;
594 if (n) {
595 icmp6stat.icp6s_reflect++;
596 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
597 icmp6_reflect(n, noff);
598 }
599 break;
600
601 case ICMP6_ECHO_REPLY:
602 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
603 if (code != 0)
604 goto badcode;
605 break;
606
607 case MLD_LISTENER_QUERY:
608 case MLD_LISTENER_REPORT:
609 if (icmp6len < sizeof(struct mld_hdr))
610 goto badlen;
611 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
612 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
613 else
614 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
615 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
616 /* give up local */
617 mld6_input(m, off);
618 m = NULL;
619 goto freeit;
620 }
621 mld6_input(n, off);
622 /* m stays. */
623 break;
624
625 case MLD_LISTENER_DONE:
626 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
627 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
628 goto badlen;
629 break; /* nothing to be done in kernel */
630
631 case MLD_MTRACE_RESP:
632 case MLD_MTRACE:
633 /* XXX: these two are experimental. not officially defind. */
634 /* XXX: per-interface statistics? */
635 break; /* just pass it to applications */
636
637 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
638 {
639 enum { WRU, FQDN } mode;
640
641 if (!icmp6_nodeinfo)
642 break;
643
644 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
645 mode = WRU;
646 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
647 mode = FQDN;
648 else
649 goto badlen;
650
651 #define hostnamelen strlen(hostname)
652 if (mode == FQDN) {
653 #ifndef PULLDOWN_TEST
654 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
655 IPPROTO_DONE);
656 #endif
657 n = m_copy(m, 0, M_COPYALL);
658 if (n)
659 n = ni6_input(n, off);
660 /* XXX meaningless if n == NULL */
661 noff = sizeof(struct ip6_hdr);
662 } else {
663 u_char *p;
664 int maxlen, maxhlen;
665
666 if ((icmp6_nodeinfo & 5) != 5)
667 break;
668
669 if (code != 0)
670 goto badcode;
671 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
672 if (maxlen >= MCLBYTES) {
673 /* Give up remote */
674 break;
675 }
676 n = m_getb(maxlen, MB_DONTWAIT, m->m_type, M_PKTHDR);
677 if (n == NULL) {
678 /* Give up remote */
679 break;
680 }
681 if (!m_dup_pkthdr(n, m, MB_DONTWAIT)) {
682 /*
683 * Previous code did a blind M_COPY_PKTHDR
684 * and said "just for rcvif". If true, then
685 * we could tolerate the dup failing (due to
686 * the deep copy of the tag chain). For now
687 * be conservative and just fail.
688 */
689 m_free(n);
690 break;
691 }
692 n->m_len = 0;
693 maxhlen = M_TRAILINGSPACE(n) - maxlen;
694 if (maxhlen > hostnamelen)
695 maxhlen = hostnamelen;
696 /*
697 * Copy IPv6 and ICMPv6 only.
698 */
699 nip6 = mtod(n, struct ip6_hdr *);
700 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
701 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
702 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
703 p = (u_char *)(nicmp6 + 1);
704 bzero(p, 4);
705 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
706 noff = sizeof(struct ip6_hdr);
707 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
708 sizeof(struct icmp6_hdr) + 4 + maxhlen;
709 nicmp6->icmp6_type = ICMP6_WRUREPLY;
710 nicmp6->icmp6_code = 0;
711 }
712 #undef hostnamelen
713 if (n) {
714 icmp6stat.icp6s_reflect++;
715 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
716 icmp6_reflect(n, noff);
717 }
718 break;
719 }
720
721 case ICMP6_WRUREPLY:
722 if (code != 0)
723 goto badcode;
724 break;
725
726 case ND_ROUTER_SOLICIT:
727 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
728 if (code != 0)
729 goto badcode;
730 if (icmp6len < sizeof(struct nd_router_solicit))
731 goto badlen;
732 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
733 /* give up local */
734 nd6_rs_input(m, off, icmp6len);
735 m = NULL;
736 goto freeit;
737 }
738 nd6_rs_input(n, off, icmp6len);
739 /* m stays. */
740 break;
741
742 case ND_ROUTER_ADVERT:
743 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
744 if (code != 0)
745 goto badcode;
746 if (icmp6len < sizeof(struct nd_router_advert))
747 goto badlen;
748 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
749 /* give up local */
750 nd6_ra_input(m, off, icmp6len);
751 m = NULL;
752 goto freeit;
753 }
754 nd6_ra_input(n, off, icmp6len);
755 /* m stays. */
756 break;
757
758 case ND_NEIGHBOR_SOLICIT:
759 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
760 if (code != 0)
761 goto badcode;
762 if (icmp6len < sizeof(struct nd_neighbor_solicit))
763 goto badlen;
764 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
765 /* give up local */
766 nd6_ns_input(m, off, icmp6len);
767 m = NULL;
768 goto freeit;
769 }
770 nd6_ns_input(n, off, icmp6len);
771 /* m stays. */
772 break;
773
774 case ND_NEIGHBOR_ADVERT:
775 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
776 if (code != 0)
777 goto badcode;
778 if (icmp6len < sizeof(struct nd_neighbor_advert))
779 goto badlen;
780 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
781 /* give up local */
782 nd6_na_input(m, off, icmp6len);
783 m = NULL;
784 goto freeit;
785 }
786 nd6_na_input(n, off, icmp6len);
787 /* m stays. */
788 break;
789
790 case ND_REDIRECT:
791 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
792 if (code != 0)
793 goto badcode;
794 if (icmp6len < sizeof(struct nd_redirect))
795 goto badlen;
796 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
797 /* give up local */
798 icmp6_redirect_input(m, off);
799 m = NULL;
800 goto freeit;
801 }
802 icmp6_redirect_input(n, off);
803 /* m stays. */
804 break;
805
806 case ICMP6_ROUTER_RENUMBERING:
807 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
808 code != ICMP6_ROUTER_RENUMBERING_RESULT)
809 goto badcode;
810 if (icmp6len < sizeof(struct icmp6_router_renum))
811 goto badlen;
812 break;
813
814 default:
815 nd6log((LOG_DEBUG,
816 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
817 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
818 ip6_sprintf(&ip6->ip6_dst),
819 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
820 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
821 /* ICMPv6 error: MUST deliver it by spec... */
822 code = PRC_NCMDS;
823 /* deliver */
824 } else {
825 /* ICMPv6 informational: MUST not deliver */
826 break;
827 }
828 deliver:
829 if (icmp6_notify_error(m, off, icmp6len, code)) {
830 /* In this case, m should've been freed. */
831 return (IPPROTO_DONE);
832 }
833 break;
834
835 badcode:
836 icmp6stat.icp6s_badcode++;
837 break;
838
839 badlen:
840 icmp6stat.icp6s_badlen++;
841 break;
842 }
843
844 /* deliver the packet to appropriate sockets */
845 icmp6_rip6_input(&m, *offp);
846
847 return IPPROTO_DONE;
848
849 freeit:
850 m_freem(m);
851 return IPPROTO_DONE;
852 }
853
854 static int
855 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code)
856 {
857 struct icmp6_hdr *icmp6;
858 struct ip6_hdr *eip6;
859 u_int32_t notifymtu;
860 struct sockaddr_in6 icmp6src, icmp6dst;
861
862 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
863 icmp6stat.icp6s_tooshort++;
864 goto freeit;
865 }
866 #ifndef PULLDOWN_TEST
867 IP6_EXTHDR_CHECK(m, off,
868 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
869 -1);
870 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
871 #else
872 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
873 sizeof(*icmp6) + sizeof(struct ip6_hdr));
874 if (icmp6 == NULL) {
875 icmp6stat.icp6s_tooshort++;
876 return (-1);
877 }
878 #endif
879 eip6 = (struct ip6_hdr *)(icmp6 + 1);
880
881 /* Detect the upper level protocol */
882 {
883 void (*ctlfunc) (int, struct sockaddr *, void *);
884 u_int8_t nxt = eip6->ip6_nxt;
885 int eoff = off + sizeof(struct icmp6_hdr) +
886 sizeof(struct ip6_hdr);
887 struct ip6ctlparam ip6cp;
888 struct in6_addr *finaldst = NULL;
889 int icmp6type = icmp6->icmp6_type;
890 struct ip6_frag *fh;
891 struct ip6_rthdr *rth;
892 int rthlen;
893
894 while (1) { /* XXX: should avoid infinite loop explicitly? */
895 struct ip6_ext *eh;
896
897 switch (nxt) {
898 case IPPROTO_HOPOPTS:
899 case IPPROTO_DSTOPTS:
900 case IPPROTO_AH:
901 #ifndef PULLDOWN_TEST
902 IP6_EXTHDR_CHECK(m, 0, eoff +
903 sizeof(struct ip6_ext),
904 -1);
905 eh = (struct ip6_ext *)(mtod(m, caddr_t)
906 + eoff);
907 #else
908 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
909 eoff, sizeof(*eh));
910 if (eh == NULL) {
911 icmp6stat.icp6s_tooshort++;
912 return (-1);
913 }
914 #endif
915
916 if (nxt == IPPROTO_AH)
917 eoff += (eh->ip6e_len + 2) << 2;
918 else
919 eoff += (eh->ip6e_len + 1) << 3;
920 nxt = eh->ip6e_nxt;
921 break;
922 case IPPROTO_ROUTING:
923 /*
924 * When the erroneous packet contains a
925 * routing header, we should examine the
926 * header to determine the final destination.
927 * Otherwise, we can't properly update
928 * information that depends on the final
929 * destination (e.g. path MTU).
930 */
931 #ifndef PULLDOWN_TEST
932 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
933 -1);
934 rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
935 + eoff);
936 #else
937 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
938 eoff, sizeof(*rth));
939 if (rth == NULL) {
940 icmp6stat.icp6s_tooshort++;
941 return (-1);
942 }
943 #endif
944 rthlen = (rth->ip6r_len + 1) << 3;
945 eoff += rthlen;
946 nxt = rth->ip6r_nxt;
947 break;
948 case IPPROTO_FRAGMENT:
949 #ifndef PULLDOWN_TEST
950 IP6_EXTHDR_CHECK(m, 0, eoff +
951 sizeof(struct ip6_frag),
952 -1);
953 fh = (struct ip6_frag *)(mtod(m, caddr_t)
954 + eoff);
955 #else
956 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
957 eoff, sizeof(*fh));
958 if (fh == NULL) {
959 icmp6stat.icp6s_tooshort++;
960 return (-1);
961 }
962 #endif
963 /*
964 * Data after a fragment header is meaningless
965 * unless it is the first fragment, but
966 * we'll go to the notify label for path MTU
967 * discovery.
968 */
969 if (fh->ip6f_offlg & IP6F_OFF_MASK)
970 goto notify;
971
972 eoff += sizeof(struct ip6_frag);
973 nxt = fh->ip6f_nxt;
974 break;
975 default:
976 /*
977 * This case includes ESP and the No Next
978 * Header. In such cases going to the notify
979 * label does not have any meaning
980 * (i.e. ctlfunc will be NULL), but we go
981 * anyway since we might have to update
982 * path MTU information.
983 */
984 goto notify;
985 }
986 }
987 notify:
988 #ifndef PULLDOWN_TEST
989 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
990 #else
991 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
992 sizeof(*icmp6) + sizeof(struct ip6_hdr));
993 if (icmp6 == NULL) {
994 icmp6stat.icp6s_tooshort++;
995 return (-1);
996 }
997 #endif
998
999 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1000 bzero(&icmp6dst, sizeof(icmp6dst));
1001 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1002 icmp6dst.sin6_family = AF_INET6;
1003 if (finaldst == NULL)
1004 icmp6dst.sin6_addr = eip6->ip6_dst;
1005 else
1006 icmp6dst.sin6_addr = *finaldst;
1007 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1008 &icmp6dst.sin6_addr);
1009 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst,
1010 NULL, NULL)) {
1011 /* should be impossbile */
1012 nd6log((LOG_DEBUG,
1013 "icmp6_notify_error: in6_embedscope failed\n"));
1014 goto freeit;
1015 }
1016
1017 /*
1018 * retrieve parameters from the inner IPv6 header, and convert
1019 * them into sockaddr structures.
1020 */
1021 bzero(&icmp6src, sizeof(icmp6src));
1022 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1023 icmp6src.sin6_family = AF_INET6;
1024 icmp6src.sin6_addr = eip6->ip6_src;
1025 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1026 &icmp6src.sin6_addr);
1027 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src,
1028 NULL, NULL)) {
1029 /* should be impossbile */
1030 nd6log((LOG_DEBUG,
1031 "icmp6_notify_error: in6_embedscope failed\n"));
1032 goto freeit;
1033 }
1034 icmp6src.sin6_flowinfo =
1035 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1036
1037 if (finaldst == NULL)
1038 finaldst = &eip6->ip6_dst;
1039 ip6cp.ip6c_m = m;
1040 ip6cp.ip6c_icmp6 = icmp6;
1041 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1042 ip6cp.ip6c_off = eoff;
1043 ip6cp.ip6c_finaldst = finaldst;
1044 ip6cp.ip6c_src = &icmp6src;
1045 ip6cp.ip6c_nxt = nxt;
1046
1047 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1048 notifymtu = ntohl(icmp6->icmp6_mtu);
1049 ip6cp.ip6c_cmdarg = (void *)&notifymtu;
1050 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1051 }
1052
1053 ctlfunc = (void (*) (int, struct sockaddr *, void *))
1054 (inet6sw[ip6_protox[nxt]].pr_ctlinput);
1055 if (ctlfunc) {
1056 (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, &ip6cp);
1057 }
1058 }
1059 return (0);
1060
1061 freeit:
1062 m_freem(m);
1063 return (-1);
1064 }
1065
1066 void
1067 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1068 {
1069 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1070 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1071 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1072 u_int mtu = ntohl(icmp6->icmp6_mtu);
1073 struct rtentry *rt = NULL;
1074 struct sockaddr_in6 sin6;
1075
1076 if (!validated)
1077 return;
1078
1079 bzero(&sin6, sizeof(sin6));
1080 sin6.sin6_family = PF_INET6;
1081 sin6.sin6_len = sizeof(struct sockaddr_in6);
1082 sin6.sin6_addr = *dst;
1083 /* XXX normally, this won't happen */
1084 if (IN6_IS_ADDR_LINKLOCAL(dst)) {
1085 sin6.sin6_addr.s6_addr16[1] =
1086 htons(m->m_pkthdr.rcvif->if_index);
1087 }
1088 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
1089 rt = rtpurelookup((struct sockaddr *)&sin6);
1090 if (rt != NULL && (rt->rt_flags & RTF_HOST) &&
1091 !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
1092 if (mtu < IPV6_MMTU) { /* XXX */
1093 rt->rt_rmx.rmx_locks |= RTV_MTU;
1094 } else if (mtu < rt->rt_ifp->if_mtu &&
1095 rt->rt_rmx.rmx_mtu > mtu) {
1096 icmp6stat.icp6s_pmtuchg++;
1097 rt->rt_rmx.rmx_mtu = mtu;
1098 }
1099 }
1100 if (rt)
1101 --rt->rt_refcnt;
1102 }
1103
1104 /*
1105 * Process a Node Information Query packet, based on
1106 * draft-ietf-ipngwg-icmp-name-lookups-07.
1107 *
1108 * Spec incompatibilities:
1109 * - IPv6 Subject address handling
1110 * - IPv4 Subject address handling support missing
1111 * - Proxy reply (answer even if it's not for me)
1112 * - joins NI group address at in6_ifattach() time only, does not cope
1113 * with hostname changes by sethostname(3)
1114 */
1115 #define hostnamelen strlen(hostname)
1116 static struct mbuf *
1117 ni6_input(struct mbuf *m, int off)
1118 {
1119 struct icmp6_nodeinfo *ni6, *nni6;
1120 struct mbuf *n = NULL;
1121 u_int16_t qtype;
1122 int subjlen;
1123 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1124 struct ni_reply_fqdn *fqdn;
1125 int addrs; /* for NI_QTYPE_NODEADDR */
1126 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1127 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
1128 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
1129 struct ip6_hdr *ip6;
1130 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1131 char *subj = NULL;
1132 struct in6_ifaddr *ia6 = NULL;
1133
1134 ip6 = mtod(m, struct ip6_hdr *);
1135 #ifndef PULLDOWN_TEST
1136 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1137 #else
1138 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1139 if (ni6 == NULL) {
1140 /* m is already reclaimed */
1141 return NULL;
1142 }
1143 #endif
1144
1145 /*
1146 * Validate IPv6 destination address.
1147 *
1148 * The Responder must discard the Query without further processing
1149 * unless it is one of the Responder's unicast or anycast addresses, or
1150 * a link-local scope multicast address which the Responder has joined.
1151 * [icmp-name-lookups-07, Section 4.]
1152 */
1153 bzero(&sin6, sizeof(sin6));
1154 sin6.sin6_family = AF_INET6;
1155 sin6.sin6_len = sizeof(struct sockaddr_in6);
1156 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
1157 /* XXX scopeid */
1158 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) {
1159 /* unicast/anycast, fine */
1160 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
1161 (icmp6_nodeinfo & 4) == 0) {
1162 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1163 "a temporary address in %s:%d",
1164 __FILE__, __LINE__));
1165 goto bad;
1166 }
1167 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr))
1168 ; /* link-local multicast, fine */
1169 else
1170 goto bad;
1171
1172 /* validate query Subject field. */
1173 qtype = ntohs(ni6->ni_qtype);
1174 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1175 switch (qtype) {
1176 case NI_QTYPE_NOOP:
1177 case NI_QTYPE_SUPTYPES:
1178 /* 07 draft */
1179 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1180 break;
1181 /* FALLTHROUGH */
1182 case NI_QTYPE_FQDN:
1183 case NI_QTYPE_NODEADDR:
1184 switch (ni6->ni_code) {
1185 case ICMP6_NI_SUBJ_IPV6:
1186 #if ICMP6_NI_SUBJ_IPV6 != 0
1187 case 0:
1188 #endif
1189 /*
1190 * backward compatibility - try to accept 03 draft
1191 * format, where no Subject is present.
1192 */
1193 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1194 subjlen == 0) {
1195 oldfqdn++;
1196 break;
1197 }
1198 #if ICMP6_NI_SUBJ_IPV6 != 0
1199 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1200 goto bad;
1201 #endif
1202
1203 if (subjlen != sizeof(sin6.sin6_addr))
1204 goto bad;
1205
1206 /*
1207 * Validate Subject address.
1208 *
1209 * Not sure what exactly "address belongs to the node"
1210 * means in the spec, is it just unicast, or what?
1211 *
1212 * At this moment we consider Subject address as
1213 * "belong to the node" if the Subject address equals
1214 * to the IPv6 destination address; validation for
1215 * IPv6 destination address should have done enough
1216 * check for us.
1217 *
1218 * We do not do proxy at this moment.
1219 */
1220 /* m_pulldown instead of copy? */
1221 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1222 subjlen, (caddr_t)&sin6.sin6_addr);
1223 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1224 &sin6.sin6_addr);
1225 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL);
1226 bzero(&sin6_d, sizeof(sin6_d));
1227 sin6_d.sin6_family = AF_INET6; /* not used, actually */
1228 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */
1229 sin6_d.sin6_addr = ip6->ip6_dst;
1230 sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1231 &ip6->ip6_dst);
1232 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL);
1233 subj = (char *)&sin6;
1234 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
1235 break;
1236
1237 /*
1238 * XXX if we are to allow other cases, we should really
1239 * be careful about scope here.
1240 * basically, we should disallow queries toward IPv6
1241 * destination X with subject Y, if scope(X) > scope(Y).
1242 * if we allow scope(X) > scope(Y), it will result in
1243 * information leakage across scope boundary.
1244 */
1245 goto bad;
1246
1247 case ICMP6_NI_SUBJ_FQDN:
1248 /*
1249 * Validate Subject name with gethostname(3).
1250 *
1251 * The behavior may need some debate, since:
1252 * - we are not sure if the node has FQDN as
1253 * hostname (returned by gethostname(3)).
1254 * - the code does wildcard match for truncated names.
1255 * however, we are not sure if we want to perform
1256 * wildcard match, if gethostname(3) side has
1257 * truncated hostname.
1258 */
1259 n = ni6_nametodns(hostname, hostnamelen, 0);
1260 if (!n || n->m_next || n->m_len == 0)
1261 goto bad;
1262 IP6_EXTHDR_GET(subj, char *, m,
1263 off + sizeof(struct icmp6_nodeinfo), subjlen);
1264 if (subj == NULL)
1265 goto bad;
1266 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1267 n->m_len)) {
1268 goto bad;
1269 }
1270 m_freem(n);
1271 n = NULL;
1272 break;
1273
1274 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1275 default:
1276 goto bad;
1277 }
1278 break;
1279 }
1280
1281 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1282 switch (qtype) {
1283 case NI_QTYPE_FQDN:
1284 if ((icmp6_nodeinfo & 1) == 0)
1285 goto bad;
1286 break;
1287 case NI_QTYPE_NODEADDR:
1288 if ((icmp6_nodeinfo & 2) == 0)
1289 goto bad;
1290 break;
1291 }
1292
1293 /* guess reply length */
1294 switch (qtype) {
1295 case NI_QTYPE_NOOP:
1296 break; /* no reply data */
1297 case NI_QTYPE_SUPTYPES:
1298 replylen += sizeof(u_int32_t);
1299 break;
1300 case NI_QTYPE_FQDN:
1301 /* XXX will append an mbuf */
1302 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1303 break;
1304 case NI_QTYPE_NODEADDR:
1305 addrs = ni6_addrs(ni6, m, &ifp, subj);
1306 if ((replylen += addrs * (sizeof(struct in6_addr) +
1307 sizeof(u_int32_t))) > MCLBYTES)
1308 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1309 break;
1310 default:
1311 /*
1312 * XXX: We must return a reply with the ICMP6 code
1313 * `unknown Qtype' in this case. However we regard the case
1314 * as an FQDN query for backward compatibility.
1315 * Older versions set a random value to this field,
1316 * so it rarely varies in the defined qtypes.
1317 * But the mechanism is not reliable...
1318 * maybe we should obsolete older versions.
1319 */
1320 qtype = NI_QTYPE_FQDN;
1321 /* XXX will append an mbuf */
1322 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1323 oldfqdn++;
1324 break;
1325 }
1326
1327 /* allocate an mbuf to reply. */
1328 if (replylen > MCLBYTES) {
1329 /*
1330 * XXX: should we try to allocate more? But MCLBYTES
1331 * is probably much larger than IPV6_MMTU...
1332 */
1333 goto bad;
1334 }
1335 n = m_getb(replylen, MB_DONTWAIT, m->m_type, M_PKTHDR);
1336 if (n == NULL) {
1337 m_freem(m);
1338 return (NULL);
1339 }
1340 M_MOVE_PKTHDR(n, m); /* just for recvif */
1341 n->m_pkthdr.len = n->m_len = replylen;
1342
1343 /* copy mbuf header and IPv6 + Node Information base headers */
1344 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1345 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1346 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1347
1348 /* qtype dependent procedure */
1349 switch (qtype) {
1350 case NI_QTYPE_NOOP:
1351 nni6->ni_code = ICMP6_NI_SUCCESS;
1352 nni6->ni_flags = 0;
1353 break;
1354 case NI_QTYPE_SUPTYPES:
1355 {
1356 u_int32_t v;
1357 nni6->ni_code = ICMP6_NI_SUCCESS;
1358 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1359 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1360 v = (u_int32_t)htonl(0x0000000f);
1361 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1362 break;
1363 }
1364 case NI_QTYPE_FQDN:
1365 nni6->ni_code = ICMP6_NI_SUCCESS;
1366 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1367 sizeof(struct ip6_hdr) +
1368 sizeof(struct icmp6_nodeinfo));
1369 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1370 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1371 /*
1372 * XXX do we really have FQDN in variable "hostname"?
1373 */
1374 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1375 if (n->m_next == NULL)
1376 goto bad;
1377 /* XXX we assume that n->m_next is not a chain */
1378 if (n->m_next->m_next != NULL)
1379 goto bad;
1380 n->m_pkthdr.len += n->m_next->m_len;
1381 break;
1382 case NI_QTYPE_NODEADDR:
1383 {
1384 int lenlim, copied;
1385
1386 nni6->ni_code = ICMP6_NI_SUCCESS;
1387 n->m_pkthdr.len = n->m_len =
1388 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1389 lenlim = M_TRAILINGSPACE(n);
1390 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1391 /* XXX: reset mbuf length */
1392 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1393 sizeof(struct icmp6_nodeinfo) + copied;
1394 break;
1395 }
1396 default:
1397 break; /* XXX impossible! */
1398 }
1399
1400 nni6->ni_type = ICMP6_NI_REPLY;
1401 m_freem(m);
1402 return (n);
1403
1404 bad:
1405 m_freem(m);
1406 if (n)
1407 m_freem(n);
1408 return (NULL);
1409 }
1410 #undef hostnamelen
1411
1412 /*
1413 * make a mbuf with DNS-encoded string. no compression support.
1414 *
1415 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1416 * treated as truncated name (two \0 at the end). this is a wild guess.
1417 */
1418 static struct mbuf *
1419 ni6_nametodns(const char *name, int namelen,
1420 int old) /* return pascal string if non-zero */
1421 {
1422 struct mbuf *m;
1423 char *cp, *ep;
1424 const char *p, *q;
1425 int i, len, nterm;
1426
1427 if (old)
1428 len = namelen + 1;
1429 else
1430 len = MCLBYTES;
1431
1432 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1433 m = m_getb(len, MB_DONTWAIT, MT_DATA, 0);
1434 if (!m)
1435 goto fail;
1436
1437 if (old) {
1438 m->m_len = len;
1439 *mtod(m, char *) = namelen;
1440 bcopy(name, mtod(m, char *) + 1, namelen);
1441 return m;
1442 } else {
1443 m->m_len = 0;
1444 cp = mtod(m, char *);
1445 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1446
1447 /* if not certain about my name, return empty buffer */
1448 if (namelen == 0)
1449 return m;
1450
1451 /*
1452 * guess if it looks like shortened hostname, or FQDN.
1453 * shortened hostname needs two trailing "\0".
1454 */
1455 i = 0;
1456 for (p = name; p < name + namelen; p++) {
1457 if (*p && *p == '.')
1458 i++;
1459 }
1460 if (i < 2)
1461 nterm = 2;
1462 else
1463 nterm = 1;
1464
1465 p = name;
1466 while (cp < ep && p < name + namelen) {
1467 i = 0;
1468 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1469 i++;
1470 /* result does not fit into mbuf */
1471 if (cp + i + 1 >= ep)
1472 goto fail;
1473 /*
1474 * DNS label length restriction, RFC1035 page 8.
1475 * "i == 0" case is included here to avoid returning
1476 * 0-length label on "foo..bar".
1477 */
1478 if (i <= 0 || i >= 64)
1479 goto fail;
1480 *cp++ = i;
1481 bcopy(p, cp, i);
1482 cp += i;
1483 p = q;
1484 if (p < name + namelen && *p == '.')
1485 p++;
1486 }
1487 /* termination */
1488 if (cp + nterm >= ep)
1489 goto fail;
1490 while (nterm-- > 0)
1491 *cp++ = '\0';
1492 m->m_len = cp - mtod(m, char *);
1493 return m;
1494 }
1495
1496 panic("should not reach here");
1497 /* NOTREACHED */
1498
1499 fail:
1500 if (m)
1501 m_freem(m);
1502 return NULL;
1503 }
1504
1505 /*
1506 * check if two DNS-encoded string matches. takes care of truncated
1507 * form (with \0\0 at the end). no compression support.
1508 * XXX upper/lowercase match (see RFC2065)
1509 */
1510 static int
1511 ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1512 {
1513 const char *a0, *b0;
1514 int l;
1515
1516 /* simplest case - need validation? */
1517 if (alen == blen && bcmp(a, b, alen) == 0)
1518 return 1;
1519
1520 a0 = a;
1521 b0 = b;
1522
1523 /* termination is mandatory */
1524 if (alen < 2 || blen < 2)
1525 return 0;
1526 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1527 return 0;
1528 alen--;
1529 blen--;
1530
1531 while (a - a0 < alen && b - b0 < blen) {
1532 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1533 return 0;
1534
1535 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1536 return 0;
1537 /* we don't support compression yet */
1538 if (a[0] >= 64 || b[0] >= 64)
1539 return 0;
1540
1541 /* truncated case */
1542 if (a[0] == 0 && a - a0 == alen - 1)
1543 return 1;
1544 if (b[0] == 0 && b - b0 == blen - 1)
1545 return 1;
1546 if (a[0] == 0 || b[0] == 0)
1547 return 0;
1548
1549 if (a[0] != b[0])
1550 return 0;
1551 l = a[0];
1552 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1553 return 0;
1554 if (bcmp(a + 1, b + 1, l) != 0)
1555 return 0;
1556
1557 a += 1 + l;
1558 b += 1 + l;
1559 }
1560
1561 if (a - a0 == alen && b - b0 == blen)
1562 return 1;
1563 else
1564 return 0;
1565 }
1566
1567 /*
1568 * calculate the number of addresses to be returned in the node info reply.
1569 */
1570 static int
1571 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
1572 char *subj)
1573 {
1574 struct ifnet *ifp;
1575 struct in6_ifaddr *ifa6;
1576 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
1577 int addrs = 0, addrsofif, iffound = 0;
1578 int niflags = ni6->ni_flags;
1579
1580 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1581 switch (ni6->ni_code) {
1582 case ICMP6_NI_SUBJ_IPV6:
1583 if (subj == NULL) /* must be impossible... */
1584 return (0);
1585 subj_ip6 = (struct sockaddr_in6 *)subj;
1586 break;
1587 default:
1588 /*
1589 * XXX: we only support IPv6 subject address for
1590 * this Qtype.
1591 */
1592 return (0);
1593 }
1594 }
1595
1596 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
1597 {
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 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet);
1671 struct in6_ifaddr *ifa6;
1672 struct ifnet *ifp_dep = NULL;
1673 int copied = 0, allow_deprecated = 0;
1674 u_char *cp = (u_char *)(nni6 + 1);
1675 int niflags = ni6->ni_flags;
1676 u_int32_t ltime;
1677
1678 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1679 return (0); /* needless to copy */
1680
1681 again:
1682
1683 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list))
1684 {
1685 struct ifaddr_container *ifac;
1686
1687 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1688 struct ifaddr *ifa = ifac->ifa;
1689
1690 if (ifa->ifa_addr->sa_family != AF_INET6)
1691 continue;
1692 ifa6 = (struct in6_ifaddr *)ifa;
1693
1694 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) &&
1695 allow_deprecated == 0) {
1696 /*
1697 * prefererred address should be put before
1698 * deprecated addresses.
1699 */
1700
1701 /* record the interface for later search */
1702 if (ifp_dep == NULL)
1703 ifp_dep = ifp;
1704
1705 continue;
1706 }
1707 else if (!(ifa6->ia6_flags & IN6_IFF_DEPRECATED) &&
1708 allow_deprecated != 0)
1709 continue; /* we now collect deprecated addrs */
1710
1711 /* What do we have to do about ::1? */
1712 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1713 case IPV6_ADDR_SCOPE_LINKLOCAL:
1714 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1715 continue;
1716 break;
1717 case IPV6_ADDR_SCOPE_SITELOCAL:
1718 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1719 continue;
1720 break;
1721 case IPV6_ADDR_SCOPE_GLOBAL:
1722 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1723 continue;
1724 break;
1725 default:
1726 continue;
1727 }
1728
1729 /*
1730 * check if anycast is okay.
1731 * XXX: just experimental. not in the spec.
1732 */
1733 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) &&
1734 !(niflags & NI_NODEADDR_FLAG_ANYCAST))
1735 continue;
1736 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) &&
1737 (icmp6_nodeinfo & 4) == 0) {
1738 continue;
1739 }
1740
1741 /* now we can copy the address */
1742 if (resid < sizeof(struct in6_addr) +
1743 sizeof(u_int32_t)) {
1744 /*
1745 * We give up much more copy.
1746 * Set the truncate flag and return.
1747 */
1748 nni6->ni_flags |=
1749 NI_NODEADDR_FLAG_TRUNCATE;
1750 return (copied);
1751 }
1752
1753 /*
1754 * Set the TTL of the address.
1755 * The TTL value should be one of the following
1756 * according to the specification:
1757 *
1758 * 1. The remaining lifetime of a DHCP lease on the
1759 * address, or
1760 * 2. The remaining Valid Lifetime of a prefix from
1761 * which the address was derived through Stateless
1762 * Autoconfiguration.
1763 *
1764 * Note that we currently do not support stateful
1765 * address configuration by DHCPv6, so the former
1766 * case can't happen.
1767 */
1768 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1769 ltime = ND6_INFINITE_LIFETIME;
1770 else {
1771 if (ifa6->ia6_lifetime.ia6t_expire >
1772 time_second)
1773 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second);
1774 else
1775 ltime = 0;
1776 }
1777
1778 bcopy(&ltime, cp, sizeof(u_int32_t));
1779 cp += sizeof(u_int32_t);
1780
1781 /* copy the address itself */
1782 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1783 sizeof(struct in6_addr));
1784 /* XXX: KAME link-local hack; remove ifindex */
1785 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr))
1786 ((struct in6_addr *)cp)->s6_addr16[1] = 0;
1787 cp += sizeof(struct in6_addr);
1788
1789 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1790 copied += (sizeof(struct in6_addr) +
1791 sizeof(u_int32_t));
1792 }
1793 if (ifp0) /* we need search only on the specified IF */
1794 break;
1795 }
1796
1797 if (allow_deprecated == 0 && ifp_dep != NULL) {
1798 ifp = ifp_dep;
1799 allow_deprecated = 1;
1800
1801 goto again;
1802 }
1803
1804 return (copied);
1805 }
1806
1807 /*
1808 * XXX almost dup'ed code with rip6_input.
1809 */
1810 static int
1811 icmp6_rip6_input(struct mbuf **mp, int off)
1812 {
1813 struct mbuf *m = *mp;
1814 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1815 struct in6pcb *in6p;
1816 struct in6pcb *last = NULL;
1817 struct sockaddr_in6 rip6src;
1818 struct icmp6_hdr *icmp6;
1819 struct mbuf *opts = NULL;
1820
1821 #ifndef PULLDOWN_TEST
1822 /* this is assumed to be safe. */
1823 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1824 #else
1825 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1826 if (icmp6 == NULL) {
1827 /* m is already reclaimed */
1828 return IPPROTO_DONE;
1829 }
1830 #endif
1831
1832 bzero(&rip6src, sizeof(rip6src));
1833 rip6src.sin6_len = sizeof(struct sockaddr_in6);
1834 rip6src.sin6_family = AF_INET6;
1835 /* KAME hack: recover scopeid */
1836 in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1837
1838 LIST_FOREACH(in6p, &ripcbinfo.pcblisthead, inp_list)
1839 {
1840 if (in6p->inp_flags & INP_PLACEMARKER)
1841 continue;
1842 if ((in6p->inp_vflag & INP_IPV6) == 0)
1843 continue;
1844 #ifdef HAVE_NRL_INPCB
1845 if (!(in6p->in6p_flags & INP_IPV6))
1846 continue;
1847 #endif
1848 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
1849 continue;
1850 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1851 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1852 continue;
1853 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1854 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1855 continue;
1856 if (in6p->in6p_icmp6filt
1857 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1858 in6p->in6p_icmp6filt))
1859 continue;
1860 if (last) {
1861 struct mbuf *n;
1862 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1863 if (last->in6p_flags & IN6P_CONTROLOPTS)
1864 ip6_savecontrol(last, &opts, ip6, n);
1865 /* strip intermediate headers */
1866 m_adj(n, off);
1867 if (ssb_appendaddr(&last->in6p_socket->so_rcv,
1868 (struct sockaddr *)&rip6src,
1869 n, opts) == 0) {
1870 /* should notify about lost packet */
1871 m_freem(n);
1872 if (opts) {
1873 m_freem(opts);
1874 }
1875 } else
1876 sorwakeup(last->in6p_socket);
1877 opts = NULL;
1878 }
1879 }
1880 last = in6p;
1881 }
1882 if (last) {
1883 if (last->in6p_flags & IN6P_CONTROLOPTS)
1884 ip6_savecontrol(last, &opts, ip6, m);
1885 /* strip intermediate headers */
1886 m_adj(m, off);
1887 if (ssb_appendaddr(&last->in6p_socket->so_rcv,
1888 (struct sockaddr *)&rip6src, m, opts) == 0) {
1889 m_freem(m);
1890 if (opts)
1891 m_freem(opts);
1892 } else
1893 sorwakeup(last->in6p_socket);
1894 } else {
1895 m_freem(m);
1896 ip6stat.ip6s_delivered--;
1897 }
1898 return IPPROTO_DONE;
1899 }
1900
1901 /*
1902 * Reflect the ip6 packet back to the source.
1903 * OFF points to the icmp6 header, counted from the top of the mbuf.
1904 */
1905 void
1906 icmp6_reflect(struct mbuf *m, size_t off)
1907 {
1908 struct ip6_hdr *ip6;
1909 struct icmp6_hdr *icmp6;
1910 struct in6_ifaddr *ia;
1911 struct in6_addr t, *src = 0;
1912 int plen;
1913 int type, code;
1914 struct ifnet *outif = NULL;
1915 struct sockaddr_in6 sa6_src, sa6_dst;
1916 #ifdef COMPAT_RFC1885
1917 int mtu = IPV6_MMTU;
1918 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst;
1919 #endif
1920
1921 /* too short to reflect */
1922 if (off < sizeof(struct ip6_hdr)) {
1923 nd6log((LOG_DEBUG,
1924 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
1925 (u_long)off, (u_long)sizeof(struct ip6_hdr),
1926 __FILE__, __LINE__));
1927 goto bad;
1928 }
1929
1930 /*
1931 * If there are extra headers between IPv6 and ICMPv6, strip
1932 * off that header first.
1933 */
1934 #ifdef DIAGNOSTIC
1935 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
1936 panic("assumption failed in icmp6_reflect");
1937 #endif
1938 if (off > sizeof(struct ip6_hdr)) {
1939 size_t l;
1940 struct ip6_hdr nip6;
1941
1942 l = off - sizeof(struct ip6_hdr);
1943 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
1944 m_adj(m, l);
1945 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
1946 if (m->m_len < l) {
1947 if ((m = m_pullup(m, l)) == NULL)
1948 return;
1949 }
1950 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
1951 } else /* off == sizeof(struct ip6_hdr) */ {
1952 size_t l;
1953 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
1954 if (m->m_len < l) {
1955 if ((m = m_pullup(m, l)) == NULL)
1956 return;
1957 }
1958 }
1959 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
1960 ip6 = mtod(m, struct ip6_hdr *);
1961 ip6->ip6_nxt = IPPROTO_ICMPV6;
1962 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
1963 type = icmp6->icmp6_type; /* keep type for statistics */
1964 code = icmp6->icmp6_code; /* ditto. */
1965
1966 t = ip6->ip6_dst;
1967 /*
1968 * ip6_input() drops a packet if its src is multicast.
1969 * So, the src is never multicast.
1970 */
1971 ip6->ip6_dst = ip6->ip6_src;
1972
1973 /*
1974 * XXX: make sure to embed scope zone information, using
1975 * already embedded IDs or the received interface (if any).
1976 * Note that rcvif may be NULL.
1977 * TODO: scoped routing case (XXX).
1978 */
1979 bzero(&sa6_src, sizeof(sa6_src));
1980 sa6_src.sin6_family = AF_INET6;
1981 sa6_src.sin6_len = sizeof(sa6_src);
1982 sa6_src.sin6_addr = ip6->ip6_dst;
1983 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
1984 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL);
1985 bzero(&sa6_dst, sizeof(sa6_dst));
1986 sa6_dst.sin6_family = AF_INET6;
1987 sa6_dst.sin6_len = sizeof(sa6_dst);
1988 sa6_dst.sin6_addr = t;
1989 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
1990 in6_embedscope(&t, &sa6_dst, NULL, NULL);
1991
1992 #ifdef COMPAT_RFC1885
1993 /*
1994 * xxx guess MTU
1995 * RFC 1885 requires that echo reply should be truncated if it
1996 * does not fit in with (return) path MTU, but the description was
1997 * removed in the new spec.
1998 */
1999 if (icmp6_reflect_rt.ro_rt == 0 ||
2000 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) {
2001 if (icmp6_reflect_rt.ro_rt) {
2002 RTFREE(icmp6_reflect_rt.ro_rt);
2003 icmp6_reflect_rt.ro_rt = 0;
2004 }
2005 bzero(sin6, sizeof(*sin6));
2006 sin6->sin6_family = PF_INET6;
2007 sin6->sin6_len = sizeof(struct sockaddr_in6);
2008 sin6->sin6_addr = ip6->ip6_dst;
2009
2010 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt,
2011 RTF_PRCLONING);
2012 }
2013
2014 if (icmp6_reflect_rt.ro_rt == 0)
2015 goto bad;
2016
2017 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST)
2018 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu)
2019 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu;
2020
2021 if (mtu < m->m_pkthdr.len) {
2022 plen -= (m->m_pkthdr.len - mtu);
2023 m_adj(m, mtu - m->m_pkthdr.len);
2024 }
2025 #endif
2026 /*
2027 * If the incoming packet was addressed directly to us(i.e. unicast),
2028 * use dst as the src for the reply.
2029 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible
2030 * (for example) when we encounter an error while forwarding procedure
2031 * destined to a duplicated address of ours.
2032 */
2033 for (ia = in6_ifaddr; ia; ia = ia->ia_next)
2034 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
2035 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2036 src = &t;
2037 break;
2038 }
2039 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
2040 /*
2041 * This is the case if the dst is our link-local address
2042 * and the sender is also ourselves.
2043 */
2044 src = &t;
2045 }
2046
2047 if (src == 0) {
2048 int e;
2049 struct route_in6 ro;
2050
2051 /*
2052 * This case matches to multicasts, our anycast, or unicasts
2053 * that we do not own. Select a source address based on the
2054 * source address of the erroneous packet.
2055 */
2056 bzero(&ro, sizeof(ro));
2057 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e, NULL);
2058 if (ro.ro_rt)
2059 RTFREE(ro.ro_rt); /* XXX: we could use this */
2060 if (src == NULL) {
2061 nd6log((LOG_DEBUG,
2062 "icmp6_reflect: source can't be determined: "
2063 "dst=%s, error=%d\n",
2064 ip6_sprintf(&sa6_src.sin6_addr), e));
2065 goto bad;
2066 }
2067 }
2068
2069 ip6->ip6_src = *src;
2070
2071 ip6->ip6_flow = 0;
2072 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2073 ip6->ip6_vfc |= IPV6_VERSION;
2074 ip6->ip6_nxt = IPPROTO_ICMPV6;
2075 if (m->m_pkthdr.rcvif) {
2076 /* XXX: This may not be the outgoing interface */
2077 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2078 } else
2079 ip6->ip6_hlim = ip6_defhlim;
2080
2081 icmp6->icmp6_cksum = 0;
2082 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2083 sizeof(struct ip6_hdr), plen);
2084
2085 /*
2086 * XXX option handling
2087 */
2088
2089 m->m_flags &= ~(M_BCAST|M_MCAST);
2090
2091 #ifdef COMPAT_RFC1885
2092 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL);
2093 #else
2094 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2095 #endif
2096 if (outif)
2097 icmp6_ifoutstat_inc(outif, type, code);
2098
2099 return;
2100
2101 bad:
2102 m_freem(m);
2103 return;
2104 }
2105
2106 void
2107 icmp6_fasttimo(void)
2108 {
2109
2110 mld6_fasttimeo();
2111 }
2112
2113 static const char *
2114 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
2115 struct in6_addr *tgt6)
2116 {
2117 static char buf[1024];
2118 ksnprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2119 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
2120 return buf;
2121 }
2122
2123 void
2124 icmp6_redirect_input(struct mbuf *m, int off)
2125 {
2126 struct ifnet *ifp = m->m_pkthdr.rcvif;
2127 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2128 struct nd_redirect *nd_rd;
2129 int icmp6len = ntohs(ip6->ip6_plen);
2130 char *lladdr = NULL;
2131 int lladdrlen = 0;
2132 u_char *redirhdr = NULL;
2133 int redirhdrlen = 0;
2134 struct rtentry *rt = NULL;
2135 int is_router;
2136 int is_onlink;
2137 struct in6_addr src6 = ip6->ip6_src;
2138 struct in6_addr redtgt6;
2139 struct in6_addr reddst6;
2140 union nd_opts ndopts;
2141
2142 if (!m || !ifp)
2143 return;
2144
2145 /* XXX if we are router, we don't update route by icmp6 redirect */
2146 if (ip6_forwarding)
2147 goto freeit;
2148 if (!icmp6_rediraccept)
2149 goto freeit;
2150
2151 #ifndef PULLDOWN_TEST
2152 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2153 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2154 #else
2155 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2156 if (nd_rd == NULL) {
2157 icmp6stat.icp6s_tooshort++;
2158 return;
2159 }
2160 #endif
2161 redtgt6 = nd_rd->nd_rd_target;
2162 reddst6 = nd_rd->nd_rd_dst;
2163
2164 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2165 redtgt6.s6_addr16[1] = htons(ifp->if_index);
2166 if (IN6_IS_ADDR_LINKLOCAL(&reddst6))
2167 reddst6.s6_addr16[1] = htons(ifp->if_index);
2168
2169 /* validation */
2170 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2171 nd6log((LOG_ERR,
2172 "ICMP6 redirect sent from %s rejected; "
2173 "must be from linklocal\n", ip6_sprintf(&src6)));
2174 goto bad;
2175 }
2176 if (ip6->ip6_hlim != 255) {
2177 nd6log((LOG_ERR,
2178 "ICMP6 redirect sent from %s rejected; "
2179 "hlim=%d (must be 255)\n",
2180 ip6_sprintf(&src6), ip6->ip6_hlim));
2181 goto bad;
2182 }
2183 {
2184 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2185 struct sockaddr_in6 sin6;
2186 struct in6_addr *gw6;
2187
2188 bzero(&sin6, sizeof(sin6));
2189 sin6.sin6_family = AF_INET6;
2190 sin6.sin6_len = sizeof(struct sockaddr_in6);
2191 bcopy(&reddst6, &sin6.sin6_addr, sizeof reddst6);
2192 rt = rtpurelookup((struct sockaddr *)&sin6);
2193 if (rt != NULL) {
2194 if (rt->rt_gateway == NULL ||
2195 rt->rt_gateway->sa_family != AF_INET6) {
2196 nd6log((LOG_ERR,
2197 "ICMP6 redirect rejected; no route "
2198 "with inet6 gateway found for redirect dst: %s\n",
2199 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2200 --rt->rt_refcnt;
2201 goto bad;
2202 }
2203
2204 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2205 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2206 nd6log((LOG_ERR,
2207 "ICMP6 redirect rejected; "
2208 "not equal to gw-for-src=%s (must be same): "
2209 "%s\n",
2210 ip6_sprintf(gw6),
2211 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2212 --rt->rt_refcnt;
2213 goto bad;
2214 }
2215 } else {
2216 nd6log((LOG_ERR,
2217 "ICMP6 redirect rejected; "
2218 "no route found for redirect dst: %s\n",
2219 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2220 goto bad;
2221 }
2222 --rt->rt_refcnt;
2223 rt = NULL;
2224 }
2225 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2226 nd6log((LOG_ERR,
2227 "ICMP6 redirect rejected; "
2228 "redirect dst must be unicast: %s\n",
2229 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2230 goto bad;
2231 }
2232
2233 is_router = is_onlink = 0;
2234 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2235 is_router = 1; /* router case */
2236 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2237 is_onlink = 1; /* on-link destination case */
2238 if (!is_router && !is_onlink) {
2239 nd6log((LOG_ERR,
2240 "ICMP6 redirect rejected; "
2241 "neither router case nor onlink case: %s\n",
2242 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2243 goto bad;
2244 }
2245 /* validation passed */
2246
2247 icmp6len -= sizeof(*nd_rd);
2248 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2249 if (nd6_options(&ndopts) < 0) {
2250 nd6log((LOG_INFO, "icmp6_redirect_input: "
2251 "invalid ND option, rejected: %s\n",
2252 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2253 /* nd6_options have incremented stats */
2254 goto freeit;
2255 }
2256
2257 if (ndopts.nd_opts_tgt_lladdr) {
2258 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2259 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2260 }
2261
2262 if (ndopts.nd_opts_rh) {
2263 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2264 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2265 }
2266
2267 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2268 nd6log((LOG_INFO,
2269 "icmp6_redirect_input: lladdrlen mismatch for %s "
2270 "(if %d, icmp6 packet %d): %s\n",
2271 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
2272 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2273 goto bad;
2274 }
2275
2276 /* RFC 2461 8.3 */
2277 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2278 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2279
2280 if (!is_onlink) { /* better router case. perform rtredirect. */
2281 /* perform rtredirect */
2282 struct sockaddr_in6 sdst;
2283 struct sockaddr_in6 sgw;
2284 struct sockaddr_in6 ssrc;
2285
2286 bzero(&sdst, sizeof(sdst));
2287 bzero(&sgw, sizeof(sgw));
2288 bzero(&ssrc, sizeof(ssrc));
2289 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2290 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2291 sizeof(struct sockaddr_in6);
2292 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2293 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2294 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2295 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
2296 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST,
2297 (struct sockaddr *)&ssrc);
2298 }
2299 /* finally update cached route in each socket via kpfctlinput */
2300 {
2301 struct sockaddr_in6 sdst;
2302
2303 bzero(&sdst, sizeof(sdst));
2304 sdst.sin6_family = AF_INET6;
2305 sdst.sin6_len = sizeof(struct sockaddr_in6);
2306 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2307 kpfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2308 #ifdef IPSEC
2309 key_sa_routechange((struct sockaddr *)&sdst);
2310 #endif
2311 }
2312
2313 freeit:
2314 m_freem(m);
2315 return;
2316
2317 bad:
2318 icmp6stat.icp6s_badredirect++;
2319 m_freem(m);
2320 }
2321
2322 void
2323 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
2324 {
2325 struct ifnet *ifp; /* my outgoing interface */
2326 struct in6_addr *ifp_ll6;
2327 struct in6_addr *router_ll6;
2328 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2329 struct mbuf *m = NULL; /* newly allocated one */
2330 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2331 struct nd_redirect *nd_rd;
2332 size_t maxlen;
2333 u_char *p;
2334 struct ifnet *outif = NULL;
2335 struct sockaddr_in6 src_sa;
2336
2337 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2338
2339 /* if we are not router, we don't send icmp6 redirect */
2340 if (!ip6_forwarding || ip6_accept_rtadv)
2341 goto fail;
2342
2343 /* sanity check */
2344 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2345 goto fail;
2346
2347 /*
2348 * Address check:
2349 * the source address must identify a neighbor, and
2350 * the destination address must not be a multicast address
2351 * [RFC 2461, sec 8.2]
2352 */
2353 sip6 = mtod(m0, struct ip6_hdr *);
2354 bzero(&src_sa, sizeof(src_sa));
2355 src_sa.sin6_family = AF_INET6;
2356 src_sa.sin6_len = sizeof(src_sa);
2357 src_sa.sin6_addr = sip6->ip6_src;
2358 /* we don't currently use sin6_scope_id, but eventually use it */
2359 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src);
2360 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2361 goto fail;
2362 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2363 goto fail; /* what should we do here? */
2364
2365 /* rate limit */
2366 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2367 goto fail;
2368
2369 /*
2370 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2371 * we almost always ask for an mbuf cluster for simplicity.
2372 * (MHLEN < IPV6_MMTU is almost always true)
2373 */
2374 #if IPV6_MMTU >= MCLBYTES
2375 # error assumption failed about IPV6_MMTU and MCLBYTES
2376 #endif
2377 m = m_getb(IPV6_MMTU, MB_DONTWAIT, MT_HEADER, M_PKTHDR);
2378 if (!m)
2379 goto fail;
2380 m->m_len = 0;
2381 maxlen = M_TRAILINGSPACE(m);
2382 maxlen = min(IPV6_MMTU, maxlen);
2383 /* just for safety */
2384 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2385 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2386 goto fail;
2387 }
2388
2389 {
2390 /* get ip6 linklocal address for ifp(my outgoing interface). */
2391 struct in6_ifaddr *ia;
2392 if ((ia = in6ifa_ifpforlinklocal(ifp,
2393 IN6_IFF_NOTREADY|
2394 IN6_IFF_ANYCAST)) == NULL)
2395 goto fail;
2396 ifp_ll6 = &ia->ia_addr.sin6_addr;
2397 }
2398
2399 /* get ip6 linklocal address for the router. */
2400 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2401 struct sockaddr_in6 *sin6;
2402 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2403 router_ll6 = &sin6->sin6_addr;
2404 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2405 router_ll6 = (struct in6_addr *)NULL;
2406 } else
2407 router_ll6 = (struct in6_addr *)NULL;
2408
2409 /* ip6 */
2410 ip6 = mtod(m, struct ip6_hdr *);
2411 ip6->ip6_flow = 0;
2412 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2413 ip6->ip6_vfc |= IPV6_VERSION;
2414 /* ip6->ip6_plen will be set later */
2415 ip6->ip6_nxt = IPPROTO_ICMPV6;
2416 ip6->ip6_hlim = 255;
2417 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2418 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2419 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2420
2421 /* ND Redirect */
2422 nd_rd = (struct nd_redirect *)(ip6 + 1);
2423 nd_rd->nd_rd_type = ND_REDIRECT;
2424 nd_rd->nd_rd_code = 0;
2425 nd_rd->nd_rd_reserved = 0;
2426 if (rt->rt_flags & RTF_GATEWAY) {
2427 /*
2428 * nd_rd->nd_rd_target must be a link-local address in
2429 * better router cases.
2430 */
2431 if (!router_ll6)
2432 goto fail;
2433 bcopy(router_ll6, &nd_rd->nd_rd_target,
2434 sizeof(nd_rd->nd_rd_target));
2435 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2436 sizeof(nd_rd->nd_rd_dst));
2437 } else {
2438 /* make sure redtgt == reddst */
2439 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2440 sizeof(nd_rd->nd_rd_target));
2441 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2442 sizeof(nd_rd->nd_rd_dst));
2443 }
2444
2445 p = (u_char *)(nd_rd + 1);
2446
2447 if (!router_ll6)
2448 goto nolladdropt;
2449
2450 {
2451 /* target lladdr option */
2452 struct rtentry *rt_router = NULL;
2453 int len;
2454 struct sockaddr_dl *sdl;
2455 struct nd_opt_hdr *nd_opt;
2456 char *lladdr;
2457
2458 rt_router = nd6_lookup(router_ll6, 0, ifp);
2459 if (!rt_router)
2460 goto nolladdropt;
2461 len = sizeof(*nd_opt) + ifp->if_addrlen;
2462 len = (len + 7) & ~7; /* round by 8 */
2463 /* safety check */
2464 if (len + (p - (u_char *)ip6) > maxlen)
2465 goto nolladdropt;
2466 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2467 (rt_router->rt_flags & RTF_LLINFO) &&
2468 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2469 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
2470 sdl->sdl_alen) {
2471 nd_opt = (struct nd_opt_hdr *)p;
2472 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2473 nd_opt->nd_opt_len = len >> 3;
2474 lladdr = (char *)(nd_opt + 1);
2475 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2476 p += len;
2477 }
2478 }
2479 nolladdropt:;
2480
2481 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2482
2483 /* just to be safe */
2484 #ifdef M_DECRYPTED /*not openbsd*/
2485 if (m0->m_flags & M_DECRYPTED)
2486 goto noredhdropt;
2487 #endif
2488 if (p - (u_char *)ip6 > maxlen)
2489 goto noredhdropt;
2490
2491 {
2492 /* redirected header option */
2493 int len;
2494 struct nd_opt_rd_hdr *nd_opt_rh;
2495
2496 /*
2497 * compute the maximum size for icmp6 redirect header option.
2498 * XXX room for auth header?
2499 */
2500 len = maxlen - (p - (u_char *)ip6);
2501 len &= ~7;
2502
2503 /* This is just for simplicity. */
2504 if (m0->m_pkthdr.len != m0->m_len) {
2505 if (m0->m_next) {
2506 m_freem(m0->m_next);
2507 m0->m_next = NULL;
2508 }
2509 m0->m_pkthdr.len = m0->m_len;
2510 }
2511
2512 /*
2513 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2514 * about padding/truncate rule for the original IP packet.
2515 * From the discussion on IPv6imp in Feb 1999, the consensus was:
2516 * - "attach as much as possible" is the goal
2517 * - pad if not aligned (original size can be guessed by original
2518 * ip6 header)
2519 * Following code adds the padding if it is simple enough,
2520 * and truncates if not.
2521 */
2522 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2523 panic("assumption failed in %s:%d", __FILE__, __LINE__);
2524
2525 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2526 /* not enough room, truncate */
2527 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2528 } else {
2529 /* enough room, pad or truncate */
2530 size_t extra;
2531
2532 extra = m0->m_pkthdr.len % 8;
2533 if (extra) {
2534 /* pad if easy enough, truncate if not */
2535 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2536 /* pad */
2537 m0->m_len += (8 - extra);
2538 m0->m_pkthdr.len += (8 - extra);
2539 } else {
2540 /* truncate */
2541 m0->m_pkthdr.len -= extra;
2542 m0->m_len -= extra;
2543 }
2544 }
2545 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2546 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2547 }
2548
2549 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2550 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2551 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2552 nd_opt_rh->nd_opt_rh_len = len >> 3;
2553 p += sizeof(*nd_opt_rh);
2554 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2555
2556 /* connect m0 to m */
2557 m->m_next = m0;
2558 m->m_pkthdr.len = m->m_len + m0->m_len;
2559 }
2560 noredhdropt:;
2561
2562 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src))
2563 sip6->ip6_src.s6_addr16[1] = 0;
2564 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst))
2565 sip6->ip6_dst.s6_addr16[1] = 0;
2566 #if 0
2567 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
2568 ip6->ip6_src.s6_addr16[1] = 0;
2569 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
2570 ip6->ip6_dst.s6_addr16[1] = 0;
2571 #endif
2572 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target))
2573 nd_rd->nd_rd_target.s6_addr16[1] = 0;
2574 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst))
2575 nd_rd->nd_rd_dst.s6_addr16[1] = 0;
2576
2577 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2578
2579 nd_rd->nd_rd_cksum = 0;
2580 nd_rd->nd_rd_cksum
2581 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2582
2583 /* send the packet to outside... */
2584 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2585 if (outif) {
2586 icmp6_ifstat_inc(outif, ifs6_out_msg);
2587 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2588 }
2589 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2590
2591 return;
2592
2593 fail:
2594 if (m)
2595 m_freem(m);
2596 if (m0)
2597 m_freem(m0);
2598 }
2599
2600 #ifdef HAVE_NRL_INPCB
2601 #define in6pcb inpcb
2602 #define in6p_icmp6filt inp_icmp6filt
2603 #endif
2604 /*
2605 * ICMPv6 socket option processing.
2606 */
2607 int
2608 icmp6_ctloutput(struct socket *so, struct sockopt *sopt)
2609 {
2610 int error = 0;
2611 int optlen;
2612 struct inpcb *inp = so->so_pcb;
2613 int level, op, optname;
2614
2615 if (sopt) {
2616 level = sopt->sopt_level;
2617 op = sopt->sopt_dir;
2618 optname = sopt->sopt_name;
2619 optlen = sopt->sopt_valsize;
2620 } else
2621 level = op = optname = optlen = 0;
2622
2623 if (level != IPPROTO_ICMPV6) {
2624 return EINVAL;
2625 }
2626
2627 switch (op) {
2628 case PRCO_SETOPT:
2629 switch (optname) {
2630 case ICMP6_FILTER:
2631 {
2632 struct icmp6_filter *p;
2633
2634 if (optlen != sizeof(*p)) {
2635 error = EMSGSIZE;
2636 break;
2637 }
2638 if (inp->in6p_icmp6filt == NULL) {
2639 error = EINVAL;
2640 break;
2641 }
2642 error = soopt_to_kbuf(sopt, inp->in6p_icmp6filt, optlen,
2643 optlen);
2644 break;
2645 }
2646
2647 default:
2648 error = ENOPROTOOPT;
2649 break;
2650 }
2651 break;
2652
2653 case PRCO_GETOPT:
2654 switch (optname) {
2655 case ICMP6_FILTER:
2656 {
2657 if (inp->in6p_icmp6filt == NULL) {
2658 error = EINVAL;
2659 break;
2660 }
2661 soopt_from_kbuf(sopt, inp->in6p_icmp6filt,
2662 sizeof(struct icmp6_filter));
2663 break;
2664 }
2665
2666 default:
2667 error = ENOPROTOOPT;
2668 break;
2669 }
2670 break;
2671 }
2672
2673 return (error);
2674 }
2675 #ifdef HAVE_NRL_INPCB
2676 #undef in6pcb
2677 #undef in6p_icmp6filt
2678 #endif
2679
2680 #ifndef HAVE_PPSRATECHECK
2681 #ifndef timersub
2682 #define timersub(tvp, uvp, vvp) \
2683 do { \
2684 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
2685 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
2686 if ((vvp)->tv_usec < 0) { \
2687 (vvp)->tv_sec--; \
2688 (vvp)->tv_usec += 1000000; \
2689 } \
2690 } while (0)
2691 #endif
2692
2693 /*
2694 * ppsratecheck(): packets (or events) per second limitation.
2695 */
2696 static int
2697 ppsratecheck(struct timeval *lasttime, int *curpps,
2698 int maxpps) /* maximum pps allowed */
2699 {
2700 struct timeval tv, delta;
2701 int rv;
2702
2703 microtime(&tv);
2704
2705 timersub(&tv, lasttime, &delta);
2706
2707 /*
2708 * Check for 0,0 so that the message will be seen at least once.
2709 * If more than one second has passed since the last update of
2710 * lasttime, reset the counter.
2711 *
2712 * We do increment *curpps even in *curpps < maxpps case, as some may
2713 * try to use *curpps for stat purposes as well.
2714 */
2715 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
2716 delta.tv_sec >= 1) {
2717 *lasttime = tv;
2718 *curpps = 0;
2719 rv = 1;
2720 } else if (maxpps < 0)
2721 rv = 1;
2722 else if (*curpps < maxpps)
2723 rv = 1;
2724 else
2725 rv = 0;
2726
2727 #if 1 /* DIAGNOSTIC? */
2728 /* be careful about wrap-around */
2729 if (*curpps + 1 > *curpps)
2730 *curpps = *curpps + 1;
2731 #else
2732 /*
2733 * assume that there's not too many calls to this function.
2734 * not sure if the assumption holds, as it depends on *caller's*
2735 * behavior, not the behavior of this function.
2736 * IMHO it is wrong to make assumption on the caller's behavior,
2737 * so the above #if is #if 1, not #ifdef DIAGNOSTIC.
2738 */
2739 *curpps = *curpps + 1;
2740 #endif
2741
2742 return (rv);
2743 }
2744 #endif
2745
2746 /*
2747 * Perform rate limit check.
2748 * Returns 0 if it is okay to send the icmp6 packet.
2749 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2750 * limitation.
2751 *
2752 * XXX per-destination/type check necessary?
2753 */
2754 static int
2755 icmp6_ratelimit(const struct in6_addr *dst, /* not used at this moment */
2756 const int type, /* not used at this moment */
2757 const int code) /* not used at this moment */
2758 {
2759 int ret;
2760
2761 ret = 0; /* okay to send */
2762
2763 /* PPS limit */
2764 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2765 icmp6errppslim)) {
2766 /* The packet is subject to rate limit */
2767 ret++;
2768 }
2769
2770 return ret;
2771 }
DragonFly BSD