?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Remove advertising clause from all that isn't contrib or userland bin.
[dragonfly.git] / sys / netinet6 / icmp6.c
blob8db672295d455182001efd18f9ed04a65db78ed4
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 * 4. 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
89 #include <netinet/in.h>
90 #include <netinet/in_var.h>
91 #include <netinet/ip6.h>
92 #include <netinet6/ip6_var.h>
93 #include <netinet/icmp6.h>
94 #include <netinet6/mld6_var.h>
95 #include <netinet/in_pcb.h>
96 #include <netinet6/in6_pcb.h>
97 #include <netinet6/nd6.h>
98 #include <netinet6/in6_ifattach.h>
99 #include <netinet6/ip6protosw.h>
100
101 #ifdef IPSEC
102 #include <netinet6/ipsec.h>
103 #include <netproto/key/key.h>
104 #endif
105
106 #ifdef FAST_IPSEC
107 #include <netproto/ipsec/ipsec.h>
108 #include <netproto/ipsec/key.h>
109 #define IPSEC
110 #endif
111
112 #include <net/net_osdep.h>
113
114 #ifdef HAVE_NRL_INPCB
115 /* inpcb members */
116 #define in6pcb inpcb
117 #define in6p_laddr inp_laddr6
118 #define in6p_faddr inp_faddr6
119 #define in6p_icmp6filt inp_icmp6filt
120 #define in6p_route inp_route
121 #define in6p_socket inp_socket
122 #define in6p_flags inp_flags
123 #define in6p_moptions inp_moptions6
124 #define in6p_outputopts inp_outputopts6
125 #define in6p_ip6 inp_ipv6
126 #define in6p_flowinfo inp_flowinfo
127 #define in6p_sp inp_sp
128 #define in6p_next inp_next
129 #define in6p_prev inp_prev
130 /* function names */
131 #define in6_pcbdetach in_pcbdetach
132 #define in6_rtchange in_rtchange
133
134 /*
135 * for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from
136 * others...
137 */
138 #define in6p_ip6_nxt inp_ipv6.ip6_nxt
139 #endif
140
141 /*
142 * ppratecheck() is available, so define it here.
143 */
144 #define HAVE_PPSRATECHECK
145
146 extern struct domain inet6domain;
147 extern struct protosw inet6sw[];
148 extern u_char ip6_protox[];
149
150 struct icmp6stat icmp6stat;
151
152 extern struct inpcbinfo ripcbinfo;
153 extern int icmp6errppslim;
154 static int icmp6errpps_count = 0;
155 static struct timeval icmp6errppslim_last;
156 extern int icmp6_nodeinfo;
157
158 static void icmp6_errcount (struct icmp6errstat *, int, int);
159 static int icmp6_rip6_input (struct mbuf **, int);
160 static int icmp6_ratelimit (const struct in6_addr *, const int, const int);
161 static const char *icmp6_redirect_diag (struct in6_addr *,
162 struct in6_addr *, struct in6_addr *);
163 #ifndef HAVE_PPSRATECHECK
164 static int ppsratecheck (struct timeval *, int *, int);
165 #endif
166 static struct mbuf *ni6_input (struct mbuf *, int);
167 static struct mbuf *ni6_nametodns (const char *, int, int);
168 static int ni6_dnsmatch (const char *, int, const char *, int);
169 static int ni6_addrs (struct icmp6_nodeinfo *, struct mbuf *,
170 struct ifnet **, char *);
171 static int ni6_store_addrs (struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
172 struct ifnet *, int);
173 static int icmp6_notify_error (struct mbuf *, int, int, int);
174
175 #ifdef COMPAT_RFC1885
176 static struct route_in6 icmp6_reflect_rt;
177 #endif
178
179
180 void
181 icmp6_init(void)
182 {
183 mld6_init();
184 }
185
186 static void
187 icmp6_errcount(struct icmp6errstat *stat, int type, int code)
188 {
189 switch (type) {
190 case ICMP6_DST_UNREACH:
191 switch (code) {
192 case ICMP6_DST_UNREACH_NOROUTE:
193 stat->icp6errs_dst_unreach_noroute++;
194 return;
195 case ICMP6_DST_UNREACH_ADMIN:
196 stat->icp6errs_dst_unreach_admin++;
197 return;
198 case ICMP6_DST_UNREACH_BEYONDSCOPE:
199 stat->icp6errs_dst_unreach_beyondscope++;
200 return;
201 case ICMP6_DST_UNREACH_ADDR:
202 stat->icp6errs_dst_unreach_addr++;
203 return;
204 case ICMP6_DST_UNREACH_NOPORT:
205 stat->icp6errs_dst_unreach_noport++;
206 return;
207 }
208 break;
209 case ICMP6_PACKET_TOO_BIG:
210 stat->icp6errs_packet_too_big++;
211 return;
212 case ICMP6_TIME_EXCEEDED:
213 switch (code) {
214 case ICMP6_TIME_EXCEED_TRANSIT:
215 stat->icp6errs_time_exceed_transit++;
216 return;
217 case ICMP6_TIME_EXCEED_REASSEMBLY:
218 stat->icp6errs_time_exceed_reassembly++;
219 return;
220 }
221 break;
222 case ICMP6_PARAM_PROB:
223 switch (code) {
224 case ICMP6_PARAMPROB_HEADER:
225 stat->icp6errs_paramprob_header++;
226 return;
227 case ICMP6_PARAMPROB_NEXTHEADER:
228 stat->icp6errs_paramprob_nextheader++;
229 return;
230 case ICMP6_PARAMPROB_OPTION:
231 stat->icp6errs_paramprob_option++;
232 return;
233 }
234 break;
235 case ND_REDIRECT:
236 stat->icp6errs_redirect++;
237 return;
238 }
239 stat->icp6errs_unknown++;
240 }
241
242 /*
243 * Generate an error packet of type error in response to bad IP6 packet.
244 */
245 void
246 icmp6_error(struct mbuf *m, int type, int code, int param)
247 {
248 struct ip6_hdr *oip6, *nip6;
249 struct icmp6_hdr *icmp6;
250 u_int preplen;
251 int off;
252 int nxt;
253
254 icmp6stat.icp6s_error++;
255
256 /* count per-type-code statistics */
257 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
258
259 #ifdef M_DECRYPTED /*not openbsd*/
260 if (m->m_flags & M_DECRYPTED) {
261 icmp6stat.icp6s_canterror++;
262 goto freeit;
263 }
264 #endif
265
266 #ifndef PULLDOWN_TEST
267 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
268 #else
269 if (m->m_len < sizeof(struct ip6_hdr)) {
270 m = m_pullup(m, sizeof(struct ip6_hdr));
271 if (m == NULL)
272 return;
273 }
274 #endif
275 oip6 = mtod(m, struct ip6_hdr *);
276
277 /*
278 * Multicast destination check. For unrecognized option errors,
279 * this check has already done in ip6_unknown_opt(), so we can
280 * check only for other errors.
281 */
282 if ((m->m_flags & (M_BCAST|M_MCAST) ||
283 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
284 (type != ICMP6_PACKET_TOO_BIG &&
285 (type != ICMP6_PARAM_PROB ||
286 code != ICMP6_PARAMPROB_OPTION)))
287 goto freeit;
288
289 /* Source address check. XXX: the case of anycast source? */
290 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
291 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
292 goto freeit;
293
294 /*
295 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
296 * don't do it.
297 */
298 nxt = -1;
299 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
300 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
301 struct icmp6_hdr *icp;
302
303 #ifndef PULLDOWN_TEST
304 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
305 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
306 #else
307 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
308 sizeof(*icp));
309 if (icp == NULL) {
310 icmp6stat.icp6s_tooshort++;
311 return;
312 }
313 #endif
314 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
315 icp->icmp6_type == ND_REDIRECT) {
316 /*
317 * ICMPv6 error
318 * Special case: for redirect (which is
319 * informational) we must not send icmp6 error.
320 */
321 icmp6stat.icp6s_canterror++;
322 goto freeit;
323 } else {
324 /* ICMPv6 informational - send the error */
325 }
326 } else {
327 /* non-ICMPv6 - send the error */
328 }
329
330 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
331
332 /* Finally, do rate limitation check. */
333 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
334 icmp6stat.icp6s_toofreq++;
335 goto freeit;
336 }
337
338 /*
339 * OK, ICMP6 can be generated.
340 */
341
342 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
343 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
344
345 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
346 M_PREPEND(m, preplen, MB_DONTWAIT);
347 if (m && m->m_len < preplen)
348 m = m_pullup(m, preplen);
349 if (m == NULL) {
350 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
351 return;
352 }
353
354 nip6 = mtod(m, struct ip6_hdr *);
355 nip6->ip6_src = oip6->ip6_src;
356 nip6->ip6_dst = oip6->ip6_dst;
357
358 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
359 oip6->ip6_src.s6_addr16[1] = 0;
360 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
361 oip6->ip6_dst.s6_addr16[1] = 0;
362
363 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
364 icmp6->icmp6_type = type;
365 icmp6->icmp6_code = code;
366 icmp6->icmp6_pptr = htonl((u_int32_t)param);
367
368 /*
369 * icmp6_reflect() is designed to be in the input path.
370 * icmp6_error() can be called from both input and outut path,
371 * and if we are in output path rcvif could contain bogus value.
372 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
373 * information in ip header (nip6).
374 */
375 m->m_pkthdr.rcvif = NULL;
376
377 icmp6stat.icp6s_outhist[type]++;
378 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
379
380 return;
381
382 freeit:
383 /*
384 * If we can't tell wheter or not we can generate ICMP6, free it.
385 */
386 m_freem(m);
387 }
388
389 /*
390 * Process a received ICMP6 message.
391 */
392 int
393 icmp6_input(struct mbuf **mp, int *offp, int proto)
394 {
395 struct mbuf *m = *mp, *n;
396 struct ip6_hdr *ip6, *nip6;
397 struct icmp6_hdr *icmp6, *nicmp6;
398 int off = *offp;
399 int icmp6len = m->m_pkthdr.len - *offp;
400 int code, sum, noff;
401
402 #ifndef PULLDOWN_TEST
403 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
404 /* m might change if M_LOOP. So, call mtod after this */
405 #endif
406
407 /*
408 * Locate icmp6 structure in mbuf, and check
409 * that not corrupted and of at least minimum length
410 */
411
412 ip6 = mtod(m, struct ip6_hdr *);
413 if (icmp6len < sizeof(struct icmp6_hdr)) {
414 icmp6stat.icp6s_tooshort++;
415 goto freeit;
416 }
417
418 /*
419 * calculate the checksum
420 */
421 #ifndef PULLDOWN_TEST
422 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
423 #else
424 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
425 if (icmp6 == NULL) {
426 icmp6stat.icp6s_tooshort++;
427 return IPPROTO_DONE;
428 }
429 #endif
430 code = icmp6->icmp6_code;
431
432 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
433 nd6log((LOG_ERR,
434 "ICMP6 checksum error(%d|%x) %s\n",
435 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
436 icmp6stat.icp6s_checksum++;
437 goto freeit;
438 }
439
440 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
441 /*
442 * Deliver very specific ICMP6 type only.
443 * This is important to deilver TOOBIG. Otherwise PMTUD
444 * will not work.
445 */
446 switch (icmp6->icmp6_type) {
447 case ICMP6_DST_UNREACH:
448 case ICMP6_PACKET_TOO_BIG:
449 case ICMP6_TIME_EXCEEDED:
450 break;
451 default:
452 goto freeit;
453 }
454 }
455
456 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
457 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
458 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
459 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
460
461 switch (icmp6->icmp6_type) {
462 case ICMP6_DST_UNREACH:
463 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
464 switch (code) {
465 case ICMP6_DST_UNREACH_NOROUTE:
466 code = PRC_UNREACH_NET;
467 break;
468 case ICMP6_DST_UNREACH_ADMIN:
469 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
470 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
471 break;
472 case ICMP6_DST_UNREACH_ADDR:
473 code = PRC_HOSTDEAD;
474 break;
475 #ifdef COMPAT_RFC1885
476 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
477 code = PRC_UNREACH_SRCFAIL;
478 break;
479 #else
480 case ICMP6_DST_UNREACH_BEYONDSCOPE:
481 /* I mean "source address was incorrect." */
482 code = PRC_PARAMPROB;
483 break;
484 #endif
485 case ICMP6_DST_UNREACH_NOPORT:
486 code = PRC_UNREACH_PORT;
487 break;
488 default:
489 goto badcode;
490 }
491 goto deliver;
492 break;
493
494 case ICMP6_PACKET_TOO_BIG:
495 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
496 if (code != 0)
497 goto badcode;
498
499 code = PRC_MSGSIZE;
500
501 /*
502 * Updating the path MTU will be done after examining
503 * intermediate extension headers.
504 */
505 goto deliver;
506 break;
507
508 case ICMP6_TIME_EXCEEDED:
509 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
510 switch (code) {
511 case ICMP6_TIME_EXCEED_TRANSIT:
512 case ICMP6_TIME_EXCEED_REASSEMBLY:
513 code += PRC_TIMXCEED_INTRANS;
514 break;
515 default:
516 goto badcode;
517 }
518 goto deliver;
519 break;
520
521 case ICMP6_PARAM_PROB:
522 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
523 switch (code) {
524 case ICMP6_PARAMPROB_NEXTHEADER:
525 code = PRC_UNREACH_PROTOCOL;
526 break;
527 case ICMP6_PARAMPROB_HEADER:
528 case ICMP6_PARAMPROB_OPTION:
529 code = PRC_PARAMPROB;
530 break;
531 default:
532 goto badcode;
533 }
534 goto deliver;
535 break;
536
537 case ICMP6_ECHO_REQUEST:
538 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
539 if (code != 0)
540 goto badcode;
541 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
542 /* Give up remote */
543 break;
544 }
545 if ((n->m_flags & M_EXT) ||
546 n->m_len < off + sizeof(struct icmp6_hdr)) {
547 struct mbuf *n0 = n;
548 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
549 int n0len;
550
551 /*
552 * Prepare an internal mbuf. m_pullup() doesn't
553 * always copy the length we specified.
554 */
555 if (maxlen >= MCLBYTES) {
556 /* Give up remote */
557 m_freem(n0);
558 break;
559 }
560 n = m_getb(maxlen, MB_DONTWAIT, n0->m_type, M_PKTHDR);
561 if (n == NULL) {
562 /* Give up remote */
563 m_freem(n0);
564 break;
565 }
566 n0len = n0->m_pkthdr.len; /* save for use below */
567 M_MOVE_PKTHDR(n, n0);
568 /*
569 * Copy IPv6 and ICMPv6 only.
570 */
571 nip6 = mtod(n, struct ip6_hdr *);
572 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
573 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
574 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
575 noff = sizeof(struct ip6_hdr);
576 /* new mbuf contains only ipv6+icmpv6 headers */
577 n->m_len = noff + sizeof(struct icmp6_hdr);
578 /*
579 * Adjust mbuf. ip6_plen will be adjusted in
580 * ip6_output().
581 */
582 m_adj(n0, off + sizeof(struct icmp6_hdr));
583 /* recalculate complete packet size */
584 n->m_pkthdr.len = n0len + (noff - off);
585 n->m_next = n0;
586 } else {
587 nip6 = mtod(n, struct ip6_hdr *);
588 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off);
589 noff = off;
590 }
591 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
592 nicmp6->icmp6_code = 0;
593 if (n) {
594 icmp6stat.icp6s_reflect++;
595 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
596 icmp6_reflect(n, noff);
597 }
598 break;
599
600 case ICMP6_ECHO_REPLY:
601 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
602 if (code != 0)
603 goto badcode;
604 break;
605
606 case MLD_LISTENER_QUERY:
607 case MLD_LISTENER_REPORT:
608 if (icmp6len < sizeof(struct mld_hdr))
609 goto badlen;
610 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
611 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
612 else
613 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
614 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
615 /* give up local */
616 mld6_input(m, off);
617 m = NULL;
618 goto freeit;
619 }
620 mld6_input(n, off);
621 /* m stays. */
622 break;
623
624 case MLD_LISTENER_DONE:
625 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
626 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
627 goto badlen;
628 break; /* nothing to be done in kernel */
629
630 case MLD_MTRACE_RESP:
631 case MLD_MTRACE:
632 /* XXX: these two are experimental. not officially defind. */
633 /* XXX: per-interface statistics? */
634 break; /* just pass it to applications */
635
636 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
637 {
638 enum { WRU, FQDN } mode;
639
640 if (!icmp6_nodeinfo)
641 break;
642
643 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
644 mode = WRU;
645 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
646 mode = FQDN;
647 else
648 goto badlen;
649
650 #define hostnamelen strlen(hostname)
651 if (mode == FQDN) {
652 #ifndef PULLDOWN_TEST
653 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
654 IPPROTO_DONE);
655 #endif
656 n = m_copy(m, 0, M_COPYALL);
657 if (n)
658 n = ni6_input(n, off);
659 /* XXX meaningless if n == NULL */
660 noff = sizeof(struct ip6_hdr);
661 } else {
662 u_char *p;
663 int maxlen, maxhlen;
664
665 if ((icmp6_nodeinfo & 5) != 5)
666 break;
667
668 if (code != 0)
669 goto badcode;
670 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
671 if (maxlen >= MCLBYTES) {
672 /* Give up remote */
673 break;
674 }
675 n = m_getb(maxlen, MB_DONTWAIT, m->m_type, M_PKTHDR);
676 if (n == NULL) {
677 /* Give up remote */
678 break;
679 }
680 if (!m_dup_pkthdr(n, m, MB_DONTWAIT)) {
681 /*
682 * Previous code did a blind M_COPY_PKTHDR
683 * and said "just for rcvif". If true, then
684 * we could tolerate the dup failing (due to
685 * the deep copy of the tag chain). For now
686 * be conservative and just fail.
687 */
688 m_free(n);
689 break;
690 }
691 n->m_len = 0;
692 maxhlen = M_TRAILINGSPACE(n) - maxlen;
693 if (maxhlen > hostnamelen)
694 maxhlen = hostnamelen;
695 /*
696 * Copy IPv6 and ICMPv6 only.
697 */
698 nip6 = mtod(n, struct ip6_hdr *);
699 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
700 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
701 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
702 p = (u_char *)(nicmp6 + 1);
703 bzero(p, 4);
704 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
705 noff = sizeof(struct ip6_hdr);
706 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
707 sizeof(struct icmp6_hdr) + 4 + maxhlen;
708 nicmp6->icmp6_type = ICMP6_WRUREPLY;
709 nicmp6->icmp6_code = 0;
710 }
711 #undef hostnamelen
712 if (n) {
713 icmp6stat.icp6s_reflect++;
714 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
715 icmp6_reflect(n, noff);
716 }
717 break;
718 }
719
720 case ICMP6_WRUREPLY:
721 if (code != 0)
722 goto badcode;
723 break;
724
725 case ND_ROUTER_SOLICIT:
726 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
727 if (code != 0)
728 goto badcode;
729 if (icmp6len < sizeof(struct nd_router_solicit))
730 goto badlen;
731 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
732 /* give up local */
733 nd6_rs_input(m, off, icmp6len);
734 m = NULL;
735 goto freeit;
736 }
737 nd6_rs_input(n, off, icmp6len);
738 /* m stays. */
739 break;
740
741 case ND_ROUTER_ADVERT:
742 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
743 if (code != 0)
744 goto badcode;
745 if (icmp6len < sizeof(struct nd_router_advert))
746 goto badlen;
747 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
748 /* give up local */
749 nd6_ra_input(m, off, icmp6len);
750 m = NULL;
751 goto freeit;
752 }
753 nd6_ra_input(n, off, icmp6len);
754 /* m stays. */
755 break;
756
757 case ND_NEIGHBOR_SOLICIT:
758 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
759 if (code != 0)
760 goto badcode;
761 if (icmp6len < sizeof(struct nd_neighbor_solicit))
762 goto badlen;
763 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
764 /* give up local */
765 nd6_ns_input(m, off, icmp6len);
766 m = NULL;
767 goto freeit;
768 }
769 nd6_ns_input(n, off, icmp6len);
770 /* m stays. */
771 break;
772
773 case ND_NEIGHBOR_ADVERT:
774 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
775 if (code != 0)
776 goto badcode;
777 if (icmp6len < sizeof(struct nd_neighbor_advert))
778 goto badlen;
779 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
780 /* give up local */
781 nd6_na_input(m, off, icmp6len);
782 m = NULL;
783 goto freeit;
784 }
785 nd6_na_input(n, off, icmp6len);
786 /* m stays. */
787 break;
788
789 case ND_REDIRECT:
790 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
791 if (code != 0)
792 goto badcode;
793 if (icmp6len < sizeof(struct nd_redirect))
794 goto badlen;
795 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
796 /* give up local */
797 icmp6_redirect_input(m, off);
798 m = NULL;
799 goto freeit;
800 }
801 icmp6_redirect_input(n, off);
802 /* m stays. */
803 break;
804
805 case ICMP6_ROUTER_RENUMBERING:
806 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
807 code != ICMP6_ROUTER_RENUMBERING_RESULT)
808 goto badcode;
809 if (icmp6len < sizeof(struct icmp6_router_renum))
810 goto badlen;
811 break;
812
813 default:
814 nd6log((LOG_DEBUG,
815 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
816 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
817 ip6_sprintf(&ip6->ip6_dst),
818 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
819 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
820 /* ICMPv6 error: MUST deliver it by spec... */
821 code = PRC_NCMDS;
822 /* deliver */
823 } else {
824 /* ICMPv6 informational: MUST not deliver */
825 break;
826 }
827 deliver:
828 if (icmp6_notify_error(m, off, icmp6len, code)) {
829 /* In this case, m should've been freed. */
830 return (IPPROTO_DONE);
831 }
832 break;
833
834 badcode:
835 icmp6stat.icp6s_badcode++;
836 break;
837
838 badlen:
839 icmp6stat.icp6s_badlen++;
840 break;
841 }
842
843 /* deliver the packet to appropriate sockets */
844 icmp6_rip6_input(&m, *offp);
845
846 return IPPROTO_DONE;
847
848 freeit:
849 m_freem(m);
850 return IPPROTO_DONE;
851 }
852
853 static int
854 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code)
855 {
856 struct icmp6_hdr *icmp6;
857 struct ip6_hdr *eip6;
858 u_int32_t notifymtu;
859 struct sockaddr_in6 icmp6src, icmp6dst;
860
861 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
862 icmp6stat.icp6s_tooshort++;
863 goto freeit;
864 }
865 #ifndef PULLDOWN_TEST
866 IP6_EXTHDR_CHECK(m, off,
867 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
868 -1);
869 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
870 #else
871 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
872 sizeof(*icmp6) + sizeof(struct ip6_hdr));
873 if (icmp6 == NULL) {
874 icmp6stat.icp6s_tooshort++;
875 return (-1);
876 }
877 #endif
878 eip6 = (struct ip6_hdr *)(icmp6 + 1);
879
880 /* Detect the upper level protocol */
881 {
882 u_int8_t nxt = eip6->ip6_nxt;
883 int eoff = off + sizeof(struct icmp6_hdr) +
884 sizeof(struct ip6_hdr);
885 struct ip6ctlparam ip6cp;
886 struct in6_addr *finaldst = NULL;
887 int icmp6type = icmp6->icmp6_type;
888 struct ip6_frag *fh;
889 struct ip6_rthdr *rth;
890 int rthlen;
891
892 while (1) { /* XXX: should avoid infinite loop explicitly? */
893 struct ip6_ext *eh;
894
895 switch (nxt) {
896 case IPPROTO_HOPOPTS:
897 case IPPROTO_DSTOPTS:
898 case IPPROTO_AH:
899 #ifndef PULLDOWN_TEST
900 IP6_EXTHDR_CHECK(m, 0, eoff +
901 sizeof(struct ip6_ext),
902 -1);
903 eh = (struct ip6_ext *)(mtod(m, caddr_t)
904 + eoff);
905 #else
906 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
907 eoff, sizeof(*eh));
908 if (eh == NULL) {
909 icmp6stat.icp6s_tooshort++;
910 return (-1);
911 }
912 #endif
913
914 if (nxt == IPPROTO_AH)
915 eoff += (eh->ip6e_len + 2) << 2;
916 else
917 eoff += (eh->ip6e_len + 1) << 3;
918 nxt = eh->ip6e_nxt;
919 break;
920 case IPPROTO_ROUTING:
921 /*
922 * When the erroneous packet contains a
923 * routing header, we should examine the
924 * header to determine the final destination.
925 * Otherwise, we can't properly update
926 * information that depends on the final
927 * destination (e.g. path MTU).
928 */
929 #ifndef PULLDOWN_TEST
930 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
931 -1);
932 rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
933 + eoff);
934 #else
935 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
936 eoff, sizeof(*rth));
937 if (rth == NULL) {
938 icmp6stat.icp6s_tooshort++;
939 return (-1);
940 }
941 #endif
942 rthlen = (rth->ip6r_len + 1) << 3;
943 eoff += rthlen;
944 nxt = rth->ip6r_nxt;
945 break;
946 case IPPROTO_FRAGMENT:
947 #ifndef PULLDOWN_TEST
948 IP6_EXTHDR_CHECK(m, 0, eoff +
949 sizeof(struct ip6_frag),
950 -1);
951 fh = (struct ip6_frag *)(mtod(m, caddr_t)
952 + eoff);
953 #else
954 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
955 eoff, sizeof(*fh));
956 if (fh == NULL) {
957 icmp6stat.icp6s_tooshort++;
958 return (-1);
959 }
960 #endif
961 /*
962 * Data after a fragment header is meaningless
963 * unless it is the first fragment, but
964 * we'll go to the notify label for path MTU
965 * discovery.
966 */
967 if (fh->ip6f_offlg & IP6F_OFF_MASK)
968 goto notify;
969
970 eoff += sizeof(struct ip6_frag);
971 nxt = fh->ip6f_nxt;
972 break;
973 default:
974 /*
975 * This case includes ESP and the No Next
976 * Header. In such cases going to the notify
977 * label does not have any meaning
978 * (i.e. pr_ctlinput will be NULL), but we go
979 * anyway since we might have to update
980 * path MTU information.
981 */
982 goto notify;
983 }
984 }
985 notify:
986 #ifndef PULLDOWN_TEST
987 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
988 #else
989 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
990 sizeof(*icmp6) + sizeof(struct ip6_hdr));
991 if (icmp6 == NULL) {
992 icmp6stat.icp6s_tooshort++;
993 return (-1);
994 }
995 #endif
996
997 eip6 = (struct ip6_hdr *)(icmp6 + 1);
998 bzero(&icmp6dst, sizeof(icmp6dst));
999 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1000 icmp6dst.sin6_family = AF_INET6;
1001 if (finaldst == NULL)
1002 icmp6dst.sin6_addr = eip6->ip6_dst;
1003 else
1004 icmp6dst.sin6_addr = *finaldst;
1005 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1006 &icmp6dst.sin6_addr);
1007 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst,
1008 NULL, NULL)) {
1009 /* should be impossbile */
1010 nd6log((LOG_DEBUG,
1011 "icmp6_notify_error: in6_embedscope failed\n"));
1012 goto freeit;
1013 }
1014
1015 /*
1016 * retrieve parameters from the inner IPv6 header, and convert
1017 * them into sockaddr structures.
1018 */
1019 bzero(&icmp6src, sizeof(icmp6src));
1020 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1021 icmp6src.sin6_family = AF_INET6;
1022 icmp6src.sin6_addr = eip6->ip6_src;
1023 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1024 &icmp6src.sin6_addr);
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_pru_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 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1220 &sin6.sin6_addr);
1221 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL);
1222 bzero(&sin6_d, sizeof(sin6_d));
1223 sin6_d.sin6_family = AF_INET6; /* not used, actually */
1224 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */
1225 sin6_d.sin6_addr = ip6->ip6_dst;
1226 sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1227 &ip6->ip6_dst);
1228 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL);
1229 subj = (char *)&sin6;
1230 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
1231 break;
1232
1233 /*
1234 * XXX if we are to allow other cases, we should really
1235 * be careful about scope here.
1236 * basically, we should disallow queries toward IPv6
1237 * destination X with subject Y, if scope(X) > scope(Y).
1238 * if we allow scope(X) > scope(Y), it will result in
1239 * information leakage across scope boundary.
1240 */
1241 goto bad;
1242
1243 case ICMP6_NI_SUBJ_FQDN:
1244 /*
1245 * Validate Subject name with gethostname(3).
1246 *
1247 * The behavior may need some debate, since:
1248 * - we are not sure if the node has FQDN as
1249 * hostname (returned by gethostname(3)).
1250 * - the code does wildcard match for truncated names.
1251 * however, we are not sure if we want to perform
1252 * wildcard match, if gethostname(3) side has
1253 * truncated hostname.
1254 */
1255 n = ni6_nametodns(hostname, hostnamelen, 0);
1256 if (!n || n->m_next || n->m_len == 0)
1257 goto bad;
1258 IP6_EXTHDR_GET(subj, char *, m,
1259 off + sizeof(struct icmp6_nodeinfo), subjlen);
1260 if (subj == NULL)
1261 goto bad;
1262 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1263 n->m_len)) {
1264 goto bad;
1265 }
1266 m_freem(n);
1267 n = NULL;
1268 break;
1269
1270 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1271 default:
1272 goto bad;
1273 }
1274 break;
1275 }
1276
1277 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1278 switch (qtype) {
1279 case NI_QTYPE_FQDN:
1280 if ((icmp6_nodeinfo & 1) == 0)
1281 goto bad;
1282 break;
1283 case NI_QTYPE_NODEADDR:
1284 if ((icmp6_nodeinfo & 2) == 0)
1285 goto bad;
1286 break;
1287 }
1288
1289 /* guess reply length */
1290 switch (qtype) {
1291 case NI_QTYPE_NOOP:
1292 break; /* no reply data */
1293 case NI_QTYPE_SUPTYPES:
1294 replylen += sizeof(u_int32_t);
1295 break;
1296 case NI_QTYPE_FQDN:
1297 /* XXX will append an mbuf */
1298 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1299 break;
1300 case NI_QTYPE_NODEADDR:
1301 addrs = ni6_addrs(ni6, m, &ifp, subj);
1302 if ((replylen += addrs * (sizeof(struct in6_addr) +
1303 sizeof(u_int32_t))) > MCLBYTES)
1304 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1305 break;
1306 default:
1307 /*
1308 * XXX: We must return a reply with the ICMP6 code
1309 * `unknown Qtype' in this case. However we regard the case
1310 * as an FQDN query for backward compatibility.
1311 * Older versions set a random value to this field,
1312 * so it rarely varies in the defined qtypes.
1313 * But the mechanism is not reliable...
1314 * maybe we should obsolete older versions.
1315 */
1316 qtype = NI_QTYPE_FQDN;
1317 /* XXX will append an mbuf */
1318 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1319 oldfqdn++;
1320 break;
1321 }
1322
1323 /* allocate an mbuf to reply. */
1324 if (replylen > MCLBYTES) {
1325 /*
1326 * XXX: should we try to allocate more? But MCLBYTES
1327 * is probably much larger than IPV6_MMTU...
1328 */
1329 goto bad;
1330 }
1331 n = m_getb(replylen, MB_DONTWAIT, m->m_type, M_PKTHDR);
1332 if (n == NULL) {
1333 m_freem(m);
1334 return (NULL);
1335 }
1336 M_MOVE_PKTHDR(n, m); /* just for recvif */
1337 n->m_pkthdr.len = n->m_len = replylen;
1338
1339 /* copy mbuf header and IPv6 + Node Information base headers */
1340 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1341 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1342 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1343
1344 /* qtype dependent procedure */
1345 switch (qtype) {
1346 case NI_QTYPE_NOOP:
1347 nni6->ni_code = ICMP6_NI_SUCCESS;
1348 nni6->ni_flags = 0;
1349 break;
1350 case NI_QTYPE_SUPTYPES:
1351 {
1352 u_int32_t v;
1353 nni6->ni_code = ICMP6_NI_SUCCESS;
1354 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1355 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1356 v = (u_int32_t)htonl(0x0000000f);
1357 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1358 break;
1359 }
1360 case NI_QTYPE_FQDN:
1361 nni6->ni_code = ICMP6_NI_SUCCESS;
1362 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1363 sizeof(struct ip6_hdr) +
1364 sizeof(struct icmp6_nodeinfo));
1365 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1366 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1367 /*
1368 * XXX do we really have FQDN in variable "hostname"?
1369 */
1370 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1371 if (n->m_next == NULL)
1372 goto bad;
1373 /* XXX we assume that n->m_next is not a chain */
1374 if (n->m_next->m_next != NULL)
1375 goto bad;
1376 n->m_pkthdr.len += n->m_next->m_len;
1377 break;
1378 case NI_QTYPE_NODEADDR:
1379 {
1380 int lenlim, copied;
1381
1382 nni6->ni_code = ICMP6_NI_SUCCESS;
1383 n->m_pkthdr.len = n->m_len =
1384 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1385 lenlim = M_TRAILINGSPACE(n);
1386 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1387 /* XXX: reset mbuf length */
1388 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1389 sizeof(struct icmp6_nodeinfo) + copied;
1390 break;
1391 }
1392 default:
1393 break; /* XXX impossible! */
1394 }
1395
1396 nni6->ni_type = ICMP6_NI_REPLY;
1397 m_freem(m);
1398 return (n);
1399
1400 bad:
1401 m_freem(m);
1402 if (n)
1403 m_freem(n);
1404 return (NULL);
1405 }
1406 #undef hostnamelen
1407
1408 /*
1409 * make a mbuf with DNS-encoded string. no compression support.
1410 *
1411 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1412 * treated as truncated name (two \0 at the end). this is a wild guess.
1413 */
1414 static struct mbuf *
1415 ni6_nametodns(const char *name, int namelen,
1416 int old) /* return pascal string if non-zero */
1417 {
1418 struct mbuf *m;
1419 char *cp, *ep;
1420 const char *p, *q;
1421 int i, len, nterm;
1422
1423 if (old)
1424 len = namelen + 1;
1425 else
1426 len = MCLBYTES;
1427
1428 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1429 m = m_getb(len, MB_DONTWAIT, MT_DATA, 0);
1430 if (!m)
1431 goto fail;
1432
1433 if (old) {
1434 m->m_len = len;
1435 *mtod(m, char *) = namelen;
1436 bcopy(name, mtod(m, char *) + 1, namelen);
1437 return m;
1438 } else {
1439 m->m_len = 0;
1440 cp = mtod(m, char *);
1441 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1442
1443 /* if not certain about my name, return empty buffer */
1444 if (namelen == 0)
1445 return m;
1446
1447 /*
1448 * guess if it looks like shortened hostname, or FQDN.
1449 * shortened hostname needs two trailing "\0".
1450 */
1451 i = 0;
1452 for (p = name; p < name + namelen; p++) {
1453 if (*p && *p == '.')
1454 i++;
1455 }
1456 if (i < 2)
1457 nterm = 2;
1458 else
1459 nterm = 1;
1460
1461 p = name;
1462 while (cp < ep && p < name + namelen) {
1463 i = 0;
1464 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1465 i++;
1466 /* result does not fit into mbuf */
1467 if (cp + i + 1 >= ep)
1468 goto fail;
1469 /*
1470 * DNS label length restriction, RFC1035 page 8.
1471 * "i == 0" case is included here to avoid returning
1472 * 0-length label on "foo..bar".
1473 */
1474 if (i <= 0 || i >= 64)
1475 goto fail;
1476 *cp++ = i;
1477 bcopy(p, cp, i);
1478 cp += i;
1479 p = q;
1480 if (p < name + namelen && *p == '.')
1481 p++;
1482 }
1483 /* termination */
1484 if (cp + nterm >= ep)
1485 goto fail;
1486 while (nterm-- > 0)
1487 *cp++ = '\0';
1488 m->m_len = cp - mtod(m, char *);
1489 return m;
1490 }
1491
1492 panic("should not reach here");
1493 /* NOTREACHED */
1494
1495 fail:
1496 if (m)
1497 m_freem(m);
1498 return NULL;
1499 }
1500
1501 /*
1502 * check if two DNS-encoded string matches. takes care of truncated
1503 * form (with \0\0 at the end). no compression support.
1504 * XXX upper/lowercase match (see RFC2065)
1505 */
1506 static int
1507 ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1508 {
1509 const char *a0, *b0;
1510 int l;
1511
1512 /* simplest case - need validation? */
1513 if (alen == blen && bcmp(a, b, alen) == 0)
1514 return 1;
1515
1516 a0 = a;
1517 b0 = b;
1518
1519 /* termination is mandatory */
1520 if (alen < 2 || blen < 2)
1521 return 0;
1522 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1523 return 0;
1524 alen--;
1525 blen--;
1526
1527 while (a - a0 < alen && b - b0 < blen) {
1528 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1529 return 0;
1530
1531 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1532 return 0;
1533 /* we don't support compression yet */
1534 if (a[0] >= 64 || b[0] >= 64)
1535 return 0;
1536
1537 /* truncated case */
1538 if (a[0] == 0 && a - a0 == alen - 1)
1539 return 1;
1540 if (b[0] == 0 && b - b0 == blen - 1)
1541 return 1;
1542 if (a[0] == 0 || b[0] == 0)
1543 return 0;
1544
1545 if (a[0] != b[0])
1546 return 0;
1547 l = a[0];
1548 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1549 return 0;
1550 if (bcmp(a + 1, b + 1, l) != 0)
1551 return 0;
1552
1553 a += 1 + l;
1554 b += 1 + l;
1555 }
1556
1557 if (a - a0 == alen && b - b0 == blen)
1558 return 1;
1559 else
1560 return 0;
1561 }
1562
1563 /*
1564 * calculate the number of addresses to be returned in the node info reply.
1565 */
1566 static int
1567 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
1568 char *subj)
1569 {
1570 struct ifnet *ifp;
1571 struct in6_ifaddr *ifa6;
1572 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
1573 int addrs = 0, addrsofif, iffound = 0;
1574 int niflags = ni6->ni_flags;
1575
1576 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1577 switch (ni6->ni_code) {
1578 case ICMP6_NI_SUBJ_IPV6:
1579 if (subj == NULL) /* must be impossible... */
1580 return (0);
1581 subj_ip6 = (struct sockaddr_in6 *)subj;
1582 break;
1583 default:
1584 /*
1585 * XXX: we only support IPv6 subject address for
1586 * this Qtype.
1587 */
1588 return (0);
1589 }
1590 }
1591
1592 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
1593 {
1594 struct ifaddr_container *ifac;
1595
1596 addrsofif = 0;
1597 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link)
1598 {
1599 struct ifaddr *ifa = ifac->ifa;
1600
1601 if (ifa->ifa_addr->sa_family != AF_INET6)
1602 continue;
1603 ifa6 = (struct in6_ifaddr *)ifa;
1604
1605 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1606 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
1607 &ifa6->ia_addr.sin6_addr))
1608 iffound = 1;
1609
1610 /*
1611 * IPv4-mapped addresses can only be returned by a
1612 * Node Information proxy, since they represent
1613 * addresses of IPv4-only nodes, which perforce do
1614 * not implement this protocol.
1615 * [icmp-name-lookups-07, Section 5.4]
1616 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1617 * this function at this moment.
1618 */
1619
1620 /* What do we have to do about ::1? */
1621 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1622 case IPV6_ADDR_SCOPE_LINKLOCAL:
1623 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1624 continue;
1625 break;
1626 case IPV6_ADDR_SCOPE_SITELOCAL:
1627 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1628 continue;
1629 break;
1630 case IPV6_ADDR_SCOPE_GLOBAL:
1631 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1632 continue;
1633 break;
1634 default:
1635 continue;
1636 }
1637
1638 /*
1639 * check if anycast is okay.
1640 * XXX: just experimental. not in the spec.
1641 */
1642 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) &&
1643 !(niflags & NI_NODEADDR_FLAG_ANYCAST))
1644 continue; /* we need only unicast addresses */
1645 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) &&
1646 (icmp6_nodeinfo & 4) == 0) {
1647 continue;
1648 }
1649 addrsofif++; /* count the address */
1650 }
1651 if (iffound) {
1652 *ifpp = ifp;
1653 return (addrsofif);
1654 }
1655
1656 addrs += addrsofif;
1657 }
1658
1659 return (addrs);
1660 }
1661
1662 static int
1663 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
1664 struct ifnet *ifp0, int resid)
1665 {
1666 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet);
1667 struct in6_ifaddr *ifa6;
1668 struct ifnet *ifp_dep = NULL;
1669 int copied = 0, allow_deprecated = 0;
1670 u_char *cp = (u_char *)(nni6 + 1);
1671 int niflags = ni6->ni_flags;
1672 u_int32_t ltime;
1673
1674 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1675 return (0); /* needless to copy */
1676
1677 again:
1678
1679 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list))
1680 {
1681 struct ifaddr_container *ifac;
1682
1683 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1684 struct ifaddr *ifa = ifac->ifa;
1685
1686 if (ifa->ifa_addr->sa_family != AF_INET6)
1687 continue;
1688 ifa6 = (struct in6_ifaddr *)ifa;
1689
1690 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) &&
1691 allow_deprecated == 0) {
1692 /*
1693 * prefererred address should be put before
1694 * deprecated addresses.
1695 */
1696
1697 /* record the interface for later search */
1698 if (ifp_dep == NULL)
1699 ifp_dep = ifp;
1700
1701 continue;
1702 }
1703 else if (!(ifa6->ia6_flags & IN6_IFF_DEPRECATED) &&
1704 allow_deprecated != 0)
1705 continue; /* we now collect deprecated addrs */
1706
1707 /* What do we have to do about ::1? */
1708 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1709 case IPV6_ADDR_SCOPE_LINKLOCAL:
1710 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1711 continue;
1712 break;
1713 case IPV6_ADDR_SCOPE_SITELOCAL:
1714 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1715 continue;
1716 break;
1717 case IPV6_ADDR_SCOPE_GLOBAL:
1718 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1719 continue;
1720 break;
1721 default:
1722 continue;
1723 }
1724
1725 /*
1726 * check if anycast is okay.
1727 * XXX: just experimental. not in the spec.
1728 */
1729 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) &&
1730 !(niflags & NI_NODEADDR_FLAG_ANYCAST))
1731 continue;
1732 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) &&
1733 (icmp6_nodeinfo & 4) == 0) {
1734 continue;
1735 }
1736
1737 /* now we can copy the address */
1738 if (resid < sizeof(struct in6_addr) +
1739 sizeof(u_int32_t)) {
1740 /*
1741 * We give up much more copy.
1742 * Set the truncate flag and return.
1743 */
1744 nni6->ni_flags |=
1745 NI_NODEADDR_FLAG_TRUNCATE;
1746 return (copied);
1747 }
1748
1749 /*
1750 * Set the TTL of the address.
1751 * The TTL value should be one of the following
1752 * according to the specification:
1753 *
1754 * 1. The remaining lifetime of a DHCP lease on the
1755 * address, or
1756 * 2. The remaining Valid Lifetime of a prefix from
1757 * which the address was derived through Stateless
1758 * Autoconfiguration.
1759 *
1760 * Note that we currently do not support stateful
1761 * address configuration by DHCPv6, so the former
1762 * case can't happen.
1763 */
1764 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1765 ltime = ND6_INFINITE_LIFETIME;
1766 else {
1767 if (ifa6->ia6_lifetime.ia6t_expire >
1768 time_second)
1769 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second);
1770 else
1771 ltime = 0;
1772 }
1773
1774 bcopy(&ltime, cp, sizeof(u_int32_t));
1775 cp += sizeof(u_int32_t);
1776
1777 /* copy the address itself */
1778 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1779 sizeof(struct in6_addr));
1780 /* XXX: KAME link-local hack; remove ifindex */
1781 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr))
1782 ((struct in6_addr *)cp)->s6_addr16[1] = 0;
1783 cp += sizeof(struct in6_addr);
1784
1785 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1786 copied += (sizeof(struct in6_addr) +
1787 sizeof(u_int32_t));
1788 }
1789 if (ifp0) /* we need search only on the specified IF */
1790 break;
1791 }
1792
1793 if (allow_deprecated == 0 && ifp_dep != NULL) {
1794 ifp = ifp_dep;
1795 allow_deprecated = 1;
1796
1797 goto again;
1798 }
1799
1800 return (copied);
1801 }
1802
1803 /*
1804 * XXX almost dup'ed code with rip6_input.
1805 */
1806 static int
1807 icmp6_rip6_input(struct mbuf **mp, int off)
1808 {
1809 struct mbuf *m = *mp;
1810 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1811 struct in6pcb *in6p;
1812 struct in6pcb *last = NULL;
1813 struct sockaddr_in6 rip6src;
1814 struct icmp6_hdr *icmp6;
1815 struct mbuf *opts = NULL;
1816
1817 #ifndef PULLDOWN_TEST
1818 /* this is assumed to be safe. */
1819 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1820 #else
1821 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1822 if (icmp6 == NULL) {
1823 /* m is already reclaimed */
1824 return IPPROTO_DONE;
1825 }
1826 #endif
1827
1828 bzero(&rip6src, sizeof(rip6src));
1829 rip6src.sin6_len = sizeof(struct sockaddr_in6);
1830 rip6src.sin6_family = AF_INET6;
1831 /* KAME hack: recover scopeid */
1832 in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1833
1834 LIST_FOREACH(in6p, &ripcbinfo.pcblisthead, inp_list)
1835 {
1836 if (in6p->inp_flags & INP_PLACEMARKER)
1837 continue;
1838 if ((in6p->inp_vflag & INP_IPV6) == 0)
1839 continue;
1840 #ifdef HAVE_NRL_INPCB
1841 if (!(in6p->in6p_flags & INP_IPV6))
1842 continue;
1843 #endif
1844 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
1845 continue;
1846 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1847 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1848 continue;
1849 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1850 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1851 continue;
1852 if (in6p->in6p_icmp6filt
1853 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1854 in6p->in6p_icmp6filt))
1855 continue;
1856 if (last) {
1857 struct socket *so;
1858 struct mbuf *n;
1859
1860 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1861 if (last->in6p_flags & IN6P_CONTROLOPTS)
1862 ip6_savecontrol(last, &opts, ip6, n);
1863 /* strip intermediate headers */
1864 m_adj(n, off);
1865 so = last->in6p_socket;
1866 lwkt_gettoken(&so->so_rcv.ssb_token);
1867 if (ssb_appendaddr(&so->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 } else {
1875 sorwakeup(so);
1876 }
1877 lwkt_reltoken(&so->so_rcv.ssb_token);
1878 opts = NULL;
1879 }
1880 }
1881 last = in6p;
1882 }
1883 if (last) {
1884 struct socket *so;
1885
1886 if (last->in6p_flags & IN6P_CONTROLOPTS)
1887 ip6_savecontrol(last, &opts, ip6, m);
1888 /* strip intermediate headers */
1889 m_adj(m, off);
1890 so = last->in6p_socket;
1891 lwkt_gettoken(&so->so_rcv.ssb_token);
1892 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&rip6src,
1893 m, opts) == 0) {
1894 m_freem(m);
1895 if (opts)
1896 m_freem(opts);
1897 } else {
1898 sorwakeup(so);
1899 }
1900 lwkt_reltoken(&so->so_rcv.ssb_token);
1901 } else {
1902 m_freem(m);
1903 ip6stat.ip6s_delivered--;
1904 }
1905 return IPPROTO_DONE;
1906 }
1907
1908 /*
1909 * Reflect the ip6 packet back to the source.
1910 * OFF points to the icmp6 header, counted from the top of the mbuf.
1911 */
1912 void
1913 icmp6_reflect(struct mbuf *m, size_t off)
1914 {
1915 struct ip6_hdr *ip6;
1916 struct icmp6_hdr *icmp6;
1917 struct in6_ifaddr *ia;
1918 struct in6_addr t, *src = NULL;
1919 int plen;
1920 int type, code;
1921 struct ifnet *outif = NULL;
1922 struct sockaddr_in6 sa6_src, sa6_dst;
1923 #ifdef COMPAT_RFC1885
1924 int mtu = IPV6_MMTU;
1925 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst;
1926 #endif
1927
1928 /* too short to reflect */
1929 if (off < sizeof(struct ip6_hdr)) {
1930 nd6log((LOG_DEBUG,
1931 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
1932 (u_long)off, (u_long)sizeof(struct ip6_hdr),
1933 __FILE__, __LINE__));
1934 goto bad;
1935 }
1936
1937 /*
1938 * If there are extra headers between IPv6 and ICMPv6, strip
1939 * off that header first.
1940 */
1941 #ifdef DIAGNOSTIC
1942 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
1943 panic("assumption failed in icmp6_reflect");
1944 #endif
1945 if (off > sizeof(struct ip6_hdr)) {
1946 size_t l;
1947 struct ip6_hdr nip6;
1948
1949 l = off - sizeof(struct ip6_hdr);
1950 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
1951 m_adj(m, l);
1952 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
1953 if (m->m_len < l) {
1954 if ((m = m_pullup(m, l)) == NULL)
1955 return;
1956 }
1957 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
1958 } else /* off == sizeof(struct ip6_hdr) */ {
1959 size_t l;
1960 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
1961 if (m->m_len < l) {
1962 if ((m = m_pullup(m, l)) == NULL)
1963 return;
1964 }
1965 }
1966 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
1967 ip6 = mtod(m, struct ip6_hdr *);
1968 ip6->ip6_nxt = IPPROTO_ICMPV6;
1969 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
1970 type = icmp6->icmp6_type; /* keep type for statistics */
1971 code = icmp6->icmp6_code; /* ditto. */
1972
1973 t = ip6->ip6_dst;
1974 /*
1975 * ip6_input() drops a packet if its src is multicast.
1976 * So, the src is never multicast.
1977 */
1978 ip6->ip6_dst = ip6->ip6_src;
1979
1980 /*
1981 * XXX: make sure to embed scope zone information, using
1982 * already embedded IDs or the received interface (if any).
1983 * Note that rcvif may be NULL.
1984 * TODO: scoped routing case (XXX).
1985 */
1986 bzero(&sa6_src, sizeof(sa6_src));
1987 sa6_src.sin6_family = AF_INET6;
1988 sa6_src.sin6_len = sizeof(sa6_src);
1989 sa6_src.sin6_addr = ip6->ip6_dst;
1990 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
1991 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL);
1992 bzero(&sa6_dst, sizeof(sa6_dst));
1993 sa6_dst.sin6_family = AF_INET6;
1994 sa6_dst.sin6_len = sizeof(sa6_dst);
1995 sa6_dst.sin6_addr = t;
1996 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
1997 in6_embedscope(&t, &sa6_dst, NULL, NULL);
1998
1999 #ifdef COMPAT_RFC1885
2000 /*
2001 * xxx guess MTU
2002 * RFC 1885 requires that echo reply should be truncated if it
2003 * does not fit in with (return) path MTU, but the description was
2004 * removed in the new spec.
2005 */
2006 if (icmp6_reflect_rt.ro_rt == 0 ||
2007 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) {
2008 if (icmp6_reflect_rt.ro_rt) {
2009 RTFREE(icmp6_reflect_rt.ro_rt);
2010 icmp6_reflect_rt.ro_rt = 0;
2011 }
2012 bzero(sin6, sizeof(*sin6));
2013 sin6->sin6_family = PF_INET6;
2014 sin6->sin6_len = sizeof(struct sockaddr_in6);
2015 sin6->sin6_addr = ip6->ip6_dst;
2016
2017 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt,
2018 RTF_PRCLONING);
2019 }
2020
2021 if (icmp6_reflect_rt.ro_rt == 0)
2022 goto bad;
2023
2024 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST)
2025 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu)
2026 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu;
2027
2028 if (mtu < m->m_pkthdr.len) {
2029 plen -= (m->m_pkthdr.len - mtu);
2030 m_adj(m, mtu - m->m_pkthdr.len);
2031 }
2032 #endif
2033 /*
2034 * If the incoming packet was addressed directly to us(i.e. unicast),
2035 * use dst as the src for the reply.
2036 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible
2037 * (for example) when we encounter an error while forwarding procedure
2038 * destined to a duplicated address of ours.
2039 */
2040 for (ia = in6_ifaddr; ia; ia = ia->ia_next)
2041 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
2042 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2043 src = &t;
2044 break;
2045 }
2046 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
2047 /*
2048 * This is the case if the dst is our link-local address
2049 * and the sender is also ourselves.
2050 */
2051 src = &t;
2052 }
2053
2054 if (src == NULL) {
2055 int e;
2056 struct route_in6 ro;
2057
2058 /*
2059 * This case matches to multicasts, our anycast, or unicasts
2060 * that we do not own. Select a source address based on the
2061 * source address of the erroneous packet.
2062 */
2063 bzero(&ro, sizeof(ro));
2064 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e, NULL);
2065 if (ro.ro_rt)
2066 RTFREE(ro.ro_rt); /* XXX: we could use this */
2067 if (src == NULL) {
2068 nd6log((LOG_DEBUG,
2069 "icmp6_reflect: source can't be determined: "
2070 "dst=%s, error=%d\n",
2071 ip6_sprintf(&sa6_src.sin6_addr), e));
2072 goto bad;
2073 }
2074 }
2075
2076 ip6->ip6_src = *src;
2077
2078 ip6->ip6_flow = 0;
2079 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2080 ip6->ip6_vfc |= IPV6_VERSION;
2081 ip6->ip6_nxt = IPPROTO_ICMPV6;
2082 if (m->m_pkthdr.rcvif) {
2083 /* XXX: This may not be the outgoing interface */
2084 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2085 } else
2086 ip6->ip6_hlim = ip6_defhlim;
2087
2088 icmp6->icmp6_cksum = 0;
2089 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2090 sizeof(struct ip6_hdr), plen);
2091
2092 /*
2093 * XXX option handling
2094 */
2095
2096 m->m_flags &= ~(M_BCAST|M_MCAST);
2097
2098 #ifdef COMPAT_RFC1885
2099 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL);
2100 #else
2101 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2102 #endif
2103 if (outif)
2104 icmp6_ifoutstat_inc(outif, type, code);
2105
2106 return;
2107
2108 bad:
2109 m_freem(m);
2110 return;
2111 }
2112
2113 void
2114 icmp6_fasttimo(void)
2115 {
2116
2117 mld6_fasttimeo();
2118 }
2119
2120 static const char *
2121 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
2122 struct in6_addr *tgt6)
2123 {
2124 static char buf[1024];
2125 ksnprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2126 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
2127 return buf;
2128 }
2129
2130 void
2131 icmp6_redirect_input(struct mbuf *m, int off)
2132 {
2133 struct ifnet *ifp = m->m_pkthdr.rcvif;
2134 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2135 struct nd_redirect *nd_rd;
2136 int icmp6len = ntohs(ip6->ip6_plen);
2137 char *lladdr = NULL;
2138 int lladdrlen = 0;
2139 #if 0
2140 u_char *redirhdr = NULL;
2141 int redirhdrlen = 0;
2142 #endif
2143 struct rtentry *rt = NULL;
2144 int is_router;
2145 int is_onlink;
2146 struct in6_addr src6 = ip6->ip6_src;
2147 struct in6_addr redtgt6;
2148 struct in6_addr reddst6;
2149 union nd_opts ndopts;
2150
2151 if (!m || !ifp)
2152 return;
2153
2154 /* XXX if we are router, we don't update route by icmp6 redirect */
2155 if (ip6_forwarding)
2156 goto freeit;
2157 if (!icmp6_rediraccept)
2158 goto freeit;
2159
2160 #ifndef PULLDOWN_TEST
2161 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2162 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2163 #else
2164 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2165 if (nd_rd == NULL) {
2166 icmp6stat.icp6s_tooshort++;
2167 return;
2168 }
2169 #endif
2170 redtgt6 = nd_rd->nd_rd_target;
2171 reddst6 = nd_rd->nd_rd_dst;
2172
2173 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2174 redtgt6.s6_addr16[1] = htons(ifp->if_index);
2175 if (IN6_IS_ADDR_LINKLOCAL(&reddst6))
2176 reddst6.s6_addr16[1] = htons(ifp->if_index);
2177
2178 /* validation */
2179 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2180 nd6log((LOG_ERR,
2181 "ICMP6 redirect sent from %s rejected; "
2182 "must be from linklocal\n", ip6_sprintf(&src6)));
2183 goto bad;
2184 }
2185 if (ip6->ip6_hlim != 255) {
2186 nd6log((LOG_ERR,
2187 "ICMP6 redirect sent from %s rejected; "
2188 "hlim=%d (must be 255)\n",
2189 ip6_sprintf(&src6), ip6->ip6_hlim));
2190 goto bad;
2191 }
2192 {
2193 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2194 struct sockaddr_in6 sin6;
2195 struct in6_addr *gw6;
2196
2197 bzero(&sin6, sizeof(sin6));
2198 sin6.sin6_family = AF_INET6;
2199 sin6.sin6_len = sizeof(struct sockaddr_in6);
2200 bcopy(&reddst6, &sin6.sin6_addr, sizeof reddst6);
2201 rt = rtpurelookup((struct sockaddr *)&sin6);
2202 if (rt != NULL) {
2203 if (rt->rt_gateway == NULL ||
2204 rt->rt_gateway->sa_family != AF_INET6) {
2205 nd6log((LOG_ERR,
2206 "ICMP6 redirect rejected; no route "
2207 "with inet6 gateway found for redirect dst: %s\n",
2208 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2209 --rt->rt_refcnt;
2210 goto bad;
2211 }
2212
2213 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2214 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2215 nd6log((LOG_ERR,
2216 "ICMP6 redirect rejected; "
2217 "not equal to gw-for-src=%s (must be same): "
2218 "%s\n",
2219 ip6_sprintf(gw6),
2220 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2221 --rt->rt_refcnt;
2222 goto bad;
2223 }
2224 } else {
2225 nd6log((LOG_ERR,
2226 "ICMP6 redirect rejected; "
2227 "no route found for redirect dst: %s\n",
2228 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2229 goto bad;
2230 }
2231 --rt->rt_refcnt;
2232 rt = NULL;
2233 }
2234 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2235 nd6log((LOG_ERR,
2236 "ICMP6 redirect rejected; "
2237 "redirect dst must be unicast: %s\n",
2238 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2239 goto bad;
2240 }
2241
2242 is_router = is_onlink = 0;
2243 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2244 is_router = 1; /* router case */
2245 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2246 is_onlink = 1; /* on-link destination case */
2247 if (!is_router && !is_onlink) {
2248 nd6log((LOG_ERR,
2249 "ICMP6 redirect rejected; "
2250 "neither router case nor onlink case: %s\n",
2251 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2252 goto bad;
2253 }
2254 /* validation passed */
2255
2256 icmp6len -= sizeof(*nd_rd);
2257 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2258 if (nd6_options(&ndopts) < 0) {
2259 nd6log((LOG_INFO, "icmp6_redirect_input: "
2260 "invalid ND option, rejected: %s\n",
2261 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2262 /* nd6_options have incremented stats */
2263 goto freeit;
2264 }
2265
2266 if (ndopts.nd_opts_tgt_lladdr) {
2267 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2268 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2269 }
2270
2271 #if 0
2272 if (ndopts.nd_opts_rh) {
2273 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2274 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2275 }
2276 #endif
2277
2278 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2279 nd6log((LOG_INFO,
2280 "icmp6_redirect_input: lladdrlen mismatch for %s "
2281 "(if %d, icmp6 packet %d): %s\n",
2282 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
2283 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2284 goto bad;
2285 }
2286
2287 /* RFC 2461 8.3 */
2288 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2289 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2290
2291 if (!is_onlink) { /* better router case. perform rtredirect. */
2292 /* perform rtredirect */
2293 struct sockaddr_in6 sdst;
2294 struct sockaddr_in6 sgw;
2295 struct sockaddr_in6 ssrc;
2296
2297 bzero(&sdst, sizeof(sdst));
2298 bzero(&sgw, sizeof(sgw));
2299 bzero(&ssrc, sizeof(ssrc));
2300 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2301 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2302 sizeof(struct sockaddr_in6);
2303 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2304 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2305 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2306 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
2307 NULL, RTF_GATEWAY | RTF_HOST,
2308 (struct sockaddr *)&ssrc);
2309 }
2310 /* finally update cached route in each socket via kpfctlinput */
2311 {
2312 struct sockaddr_in6 sdst;
2313
2314 bzero(&sdst, sizeof(sdst));
2315 sdst.sin6_family = AF_INET6;
2316 sdst.sin6_len = sizeof(struct sockaddr_in6);
2317 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2318 kpfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2319 #ifdef IPSEC
2320 key_sa_routechange((struct sockaddr *)&sdst);
2321 #endif
2322 }
2323
2324 freeit:
2325 m_freem(m);
2326 return;
2327
2328 bad:
2329 icmp6stat.icp6s_badredirect++;
2330 m_freem(m);
2331 }
2332
2333 void
2334 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
2335 {
2336 struct ifnet *ifp; /* my outgoing interface */
2337 struct in6_addr *ifp_ll6;
2338 struct in6_addr *router_ll6;
2339 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2340 struct mbuf *m = NULL; /* newly allocated one */
2341 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2342 struct nd_redirect *nd_rd;
2343 size_t maxlen;
2344 u_char *p;
2345 struct ifnet *outif = NULL;
2346 struct sockaddr_in6 src_sa;
2347
2348 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2349
2350 /* if we are not router, we don't send icmp6 redirect */
2351 if (!ip6_forwarding || ip6_accept_rtadv)
2352 goto fail;
2353
2354 /* sanity check */
2355 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2356 goto fail;
2357
2358 /*
2359 * Address check:
2360 * the source address must identify a neighbor, and
2361 * the destination address must not be a multicast address
2362 * [RFC 2461, sec 8.2]
2363 */
2364 sip6 = mtod(m0, struct ip6_hdr *);
2365 bzero(&src_sa, sizeof(src_sa));
2366 src_sa.sin6_family = AF_INET6;
2367 src_sa.sin6_len = sizeof(src_sa);
2368 src_sa.sin6_addr = sip6->ip6_src;
2369 /* we don't currently use sin6_scope_id, but eventually use it */
2370 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src);
2371 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2372 goto fail;
2373 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2374 goto fail; /* what should we do here? */
2375
2376 /* rate limit */
2377 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2378 goto fail;
2379
2380 /*
2381 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2382 * we almost always ask for an mbuf cluster for simplicity.
2383 * (MHLEN < IPV6_MMTU is almost always true)
2384 */
2385 #if IPV6_MMTU >= MCLBYTES
2386 # error assumption failed about IPV6_MMTU and MCLBYTES
2387 #endif
2388 m = m_getb(IPV6_MMTU, MB_DONTWAIT, MT_HEADER, M_PKTHDR);
2389 if (!m)
2390 goto fail;
2391 m->m_len = 0;
2392 maxlen = M_TRAILINGSPACE(m);
2393 maxlen = min(IPV6_MMTU, maxlen);
2394 /* just for safety */
2395 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2396 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2397 goto fail;
2398 }
2399
2400 {
2401 /* get ip6 linklocal address for ifp(my outgoing interface). */
2402 struct in6_ifaddr *ia;
2403 if ((ia = in6ifa_ifpforlinklocal(ifp,
2404 IN6_IFF_NOTREADY|
2405 IN6_IFF_ANYCAST)) == NULL)
2406 goto fail;
2407 ifp_ll6 = &ia->ia_addr.sin6_addr;
2408 }
2409
2410 /* get ip6 linklocal address for the router. */
2411 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2412 struct sockaddr_in6 *sin6;
2413 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2414 router_ll6 = &sin6->sin6_addr;
2415 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2416 router_ll6 = NULL;
2417 } else
2418 router_ll6 = NULL;
2419
2420 /* ip6 */
2421 ip6 = mtod(m, struct ip6_hdr *);
2422 ip6->ip6_flow = 0;
2423 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2424 ip6->ip6_vfc |= IPV6_VERSION;
2425 /* ip6->ip6_plen will be set later */
2426 ip6->ip6_nxt = IPPROTO_ICMPV6;
2427 ip6->ip6_hlim = 255;
2428 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2429 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2430 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2431
2432 /* ND Redirect */
2433 nd_rd = (struct nd_redirect *)(ip6 + 1);
2434 nd_rd->nd_rd_type = ND_REDIRECT;
2435 nd_rd->nd_rd_code = 0;
2436 nd_rd->nd_rd_reserved = 0;
2437 if (rt->rt_flags & RTF_GATEWAY) {
2438 /*
2439 * nd_rd->nd_rd_target must be a link-local address in
2440 * better router cases.
2441 */
2442 if (!router_ll6)
2443 goto fail;
2444 bcopy(router_ll6, &nd_rd->nd_rd_target,
2445 sizeof(nd_rd->nd_rd_target));
2446 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2447 sizeof(nd_rd->nd_rd_dst));
2448 } else {
2449 /* make sure redtgt == reddst */
2450 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2451 sizeof(nd_rd->nd_rd_target));
2452 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2453 sizeof(nd_rd->nd_rd_dst));
2454 }
2455
2456 p = (u_char *)(nd_rd + 1);
2457
2458 if (!router_ll6)
2459 goto nolladdropt;
2460
2461 {
2462 /* target lladdr option */
2463 struct rtentry *rt_router = NULL;
2464 int len;
2465 struct sockaddr_dl *sdl;
2466 struct nd_opt_hdr *nd_opt;
2467 char *lladdr;
2468
2469 rt_router = nd6_lookup(router_ll6, 0, ifp);
2470 if (!rt_router)
2471 goto nolladdropt;
2472 len = sizeof(*nd_opt) + ifp->if_addrlen;
2473 len = (len + 7) & ~7; /* round by 8 */
2474 /* safety check */
2475 if (len + (p - (u_char *)ip6) > maxlen)
2476 goto nolladdropt;
2477 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2478 (rt_router->rt_flags & RTF_LLINFO) &&
2479 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2480 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
2481 sdl->sdl_alen) {
2482 nd_opt = (struct nd_opt_hdr *)p;
2483 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2484 nd_opt->nd_opt_len = len >> 3;
2485 lladdr = (char *)(nd_opt + 1);
2486 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2487 p += len;
2488 }
2489 }
2490 nolladdropt:;
2491
2492 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2493
2494 /* just to be safe */
2495 #ifdef M_DECRYPTED /*not openbsd*/
2496 if (m0->m_flags & M_DECRYPTED)
2497 goto noredhdropt;
2498 #endif
2499 if (p - (u_char *)ip6 > maxlen)
2500 goto noredhdropt;
2501
2502 {
2503 /* redirected header option */
2504 int len;
2505 struct nd_opt_rd_hdr *nd_opt_rh;
2506
2507 /*
2508 * compute the maximum size for icmp6 redirect header option.
2509 * XXX room for auth header?
2510 */
2511 len = maxlen - (p - (u_char *)ip6);
2512 len &= ~7;
2513
2514 /* This is just for simplicity. */
2515 if (m0->m_pkthdr.len != m0->m_len) {
2516 if (m0->m_next) {
2517 m_freem(m0->m_next);
2518 m0->m_next = NULL;
2519 }
2520 m0->m_pkthdr.len = m0->m_len;
2521 }
2522
2523 /*
2524 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2525 * about padding/truncate rule for the original IP packet.
2526 * From the discussion on IPv6imp in Feb 1999, the consensus was:
2527 * - "attach as much as possible" is the goal
2528 * - pad if not aligned (original size can be guessed by original
2529 * ip6 header)
2530 * Following code adds the padding if it is simple enough,
2531 * and truncates if not.
2532 */
2533 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2534 panic("assumption failed in %s:%d", __FILE__, __LINE__);
2535
2536 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2537 /* not enough room, truncate */
2538 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2539 } else {
2540 /* enough room, pad or truncate */
2541 size_t extra;
2542
2543 extra = m0->m_pkthdr.len % 8;
2544 if (extra) {
2545 /* pad if easy enough, truncate if not */
2546 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2547 /* pad */
2548 m0->m_len += (8 - extra);
2549 m0->m_pkthdr.len += (8 - extra);
2550 } else {
2551 /* truncate */
2552 m0->m_pkthdr.len -= extra;
2553 m0->m_len -= extra;
2554 }
2555 }
2556 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2557 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2558 }
2559
2560 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2561 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2562 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2563 nd_opt_rh->nd_opt_rh_len = len >> 3;
2564 p += sizeof(*nd_opt_rh);
2565 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2566
2567 /* connect m0 to m */
2568 m->m_next = m0;
2569 m->m_pkthdr.len = m->m_len + m0->m_len;
2570 }
2571 noredhdropt:;
2572
2573 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src))
2574 sip6->ip6_src.s6_addr16[1] = 0;
2575 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst))
2576 sip6->ip6_dst.s6_addr16[1] = 0;
2577 #if 0
2578 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
2579 ip6->ip6_src.s6_addr16[1] = 0;
2580 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
2581 ip6->ip6_dst.s6_addr16[1] = 0;
2582 #endif
2583 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target))
2584 nd_rd->nd_rd_target.s6_addr16[1] = 0;
2585 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst))
2586 nd_rd->nd_rd_dst.s6_addr16[1] = 0;
2587
2588 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2589
2590 nd_rd->nd_rd_cksum = 0;
2591 nd_rd->nd_rd_cksum
2592 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2593
2594 /* send the packet to outside... */
2595 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2596 if (outif) {
2597 icmp6_ifstat_inc(outif, ifs6_out_msg);
2598 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2599 }
2600 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2601
2602 return;
2603
2604 fail:
2605 if (m)
2606 m_freem(m);
2607 if (m0)
2608 m_freem(m0);
2609 }
2610
2611 #ifdef HAVE_NRL_INPCB
2612 #define in6pcb inpcb
2613 #define in6p_icmp6filt inp_icmp6filt
2614 #endif
2615 /*
2616 * ICMPv6 socket option processing.
2617 */
2618 void
2619 icmp6_ctloutput(netmsg_t msg)
2620 {
2621 struct socket *so = msg->ctloutput.base.nm_so;
2622 struct sockopt *sopt = msg->ctloutput.nm_sopt;
2623 int error = 0;
2624 int optlen;
2625 struct inpcb *inp = so->so_pcb;
2626 int level, op, optname;
2627
2628 if (sopt) {
2629 level = sopt->sopt_level;
2630 op = sopt->sopt_dir;
2631 optname = sopt->sopt_name;
2632 optlen = sopt->sopt_valsize;
2633 } else
2634 level = op = optname = optlen = 0;
2635
2636 if (level != IPPROTO_ICMPV6) {
2637 error = EINVAL;
2638 goto out;
2639 }
2640
2641 switch (op) {
2642 case PRCO_SETOPT:
2643 switch (optname) {
2644 case ICMP6_FILTER:
2645 {
2646 if (optlen != sizeof(struct icmp6_filter)) {
2647 error = EMSGSIZE;
2648 break;
2649 }
2650 if (inp->in6p_icmp6filt == NULL) {
2651 error = EINVAL;
2652 break;
2653 }
2654 error = soopt_to_kbuf(sopt, inp->in6p_icmp6filt, optlen,
2655 optlen);
2656 break;
2657 }
2658
2659 default:
2660 error = ENOPROTOOPT;
2661 break;
2662 }
2663 break;
2664
2665 case PRCO_GETOPT:
2666 switch (optname) {
2667 case ICMP6_FILTER:
2668 {
2669 if (inp->in6p_icmp6filt == NULL) {
2670 error = EINVAL;
2671 break;
2672 }
2673 soopt_from_kbuf(sopt, inp->in6p_icmp6filt,
2674 sizeof(struct icmp6_filter));
2675 break;
2676 }
2677
2678 default:
2679 error = ENOPROTOOPT;
2680 break;
2681 }
2682 break;
2683 }
2684 out:
2685 lwkt_replymsg(&msg->ctloutput.base.lmsg, error);
2686 }
2687 #ifdef HAVE_NRL_INPCB
2688 #undef in6pcb
2689 #undef in6p_icmp6filt
2690 #endif
2691
2692 #ifndef HAVE_PPSRATECHECK
2693 #ifndef timersub
2694 #define timersub(tvp, uvp, vvp) \
2695 do { \
2696 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
2697 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
2698 if ((vvp)->tv_usec < 0) { \
2699 (vvp)->tv_sec--; \
2700 (vvp)->tv_usec += 1000000; \
2701 } \
2702 } while (0)
2703 #endif
2704
2705 /*
2706 * ppsratecheck(): packets (or events) per second limitation.
2707 */
2708 static int
2709 ppsratecheck(struct timeval *lasttime, int *curpps,
2710 int maxpps) /* maximum pps allowed */
2711 {
2712 struct timeval tv, delta;
2713 int rv;
2714
2715 microtime(&tv);
2716
2717 timersub(&tv, lasttime, &delta);
2718
2719 /*
2720 * Check for 0,0 so that the message will be seen at least once.
2721 * If more than one second has passed since the last update of
2722 * lasttime, reset the counter.
2723 *
2724 * We do increment *curpps even in *curpps < maxpps case, as some may
2725 * try to use *curpps for stat purposes as well.
2726 */
2727 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
2728 delta.tv_sec >= 1) {
2729 *lasttime = tv;
2730 *curpps = 0;
2731 rv = 1;
2732 } else if (maxpps < 0)
2733 rv = 1;
2734 else if (*curpps < maxpps)
2735 rv = 1;
2736 else
2737 rv = 0;
2738
2739 #if 1 /* DIAGNOSTIC? */
2740 /* be careful about wrap-around */
2741 if (*curpps + 1 > *curpps)
2742 *curpps = *curpps + 1;
2743 #else
2744 /*
2745 * assume that there's not too many calls to this function.
2746 * not sure if the assumption holds, as it depends on *caller's*
2747 * behavior, not the behavior of this function.
2748 * IMHO it is wrong to make assumption on the caller's behavior,
2749 * so the above #if is #if 1, not #ifdef DIAGNOSTIC.
2750 */
2751 *curpps = *curpps + 1;
2752 #endif
2753
2754 return (rv);
2755 }
2756 #endif
2757
2758 /*
2759 * Perform rate limit check.
2760 * Returns 0 if it is okay to send the icmp6 packet.
2761 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2762 * limitation.
2763 *
2764 * XXX per-destination/type check necessary?
2765 */
2766 static int
2767 icmp6_ratelimit(const struct in6_addr *dst, /* not used at this moment */
2768 const int type, /* not used at this moment */
2769 const int code) /* not used at this moment */
2770 {
2771 int ret;
2772
2773 ret = 0; /* okay to send */
2774
2775 /* PPS limit */
2776 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2777 icmp6errppslim)) {
2778 /* The packet is subject to rate limit */
2779 ret++;
2780 }
2781
2782 return ret;
2783 }
DragonFly BSD