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drm: Put abs64 definition in the right place
[dragonfly.git] / sys / netinet6 / icmp6.c
blobf374f29ff714793acbf299132258b1df4c9882c0
1 /* $FreeBSD: src/sys/netinet6/icmp6.c,v 1.6.2.13 2003/05/06 06:46:58 suz Exp $ */
2 /* $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $ */
3
4 /*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 /*
34 * Copyright (c) 1982, 1986, 1988, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 * 3. Neither the name of the University nor the names of its contributors
46 * may be used to endorse or promote products derived from this software
47 * without specific prior written permission.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59 * SUCH DAMAGE.
60 *
61 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
62 */
63
64 #include "opt_inet.h"
65 #include "opt_inet6.h"
66 #include "opt_ipsec.h"
67
68 #include <sys/param.h>
69 #include <sys/systm.h>
70 #include <sys/malloc.h>
71 #include <sys/mbuf.h>
72 #include <sys/protosw.h>
73 #include <sys/socket.h>
74 #include <sys/socketvar.h>
75 #include <sys/socketops.h>
76 #include <sys/time.h>
77 #include <sys/kernel.h>
78 #include <sys/syslog.h>
79 #include <sys/domain.h>
80
81 #include <sys/thread2.h>
82 #include <sys/msgport2.h>
83
84 #include <net/if.h>
85 #include <net/route.h>
86 #include <net/if_dl.h>
87 #include <net/if_types.h>
88
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, M_NOWAIT);
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, M_NOWAIT, 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, M_NOWAIT)) == 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, M_NOWAIT, m->m_type, M_PKTHDR);
676 if (n == NULL) {
677 /* Give up remote */
678 break;
679 }
680 if (!m_dup_pkthdr(n, m, M_NOWAIT)) {
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, M_NOWAIT)) == 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, M_NOWAIT)) == 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, M_NOWAIT)) == 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, M_NOWAIT)) == 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, M_NOWAIT)) == 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_pr_ctlinput(
1052 &inet6sw[ip6_protox[nxt]],
1053 code, (struct sockaddr *)&icmp6dst, &ip6cp);
1054 }
1055 return (0);
1056
1057 freeit:
1058 m_freem(m);
1059 return (-1);
1060 }
1061
1062 void
1063 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1064 {
1065 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1066 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1067 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1068 u_int mtu = ntohl(icmp6->icmp6_mtu);
1069 struct rtentry *rt = NULL;
1070 struct sockaddr_in6 sin6;
1071
1072 if (!validated)
1073 return;
1074
1075 bzero(&sin6, sizeof(sin6));
1076 sin6.sin6_family = PF_INET6;
1077 sin6.sin6_len = sizeof(struct sockaddr_in6);
1078 sin6.sin6_addr = *dst;
1079 /* XXX normally, this won't happen */
1080 if (IN6_IS_ADDR_LINKLOCAL(dst)) {
1081 sin6.sin6_addr.s6_addr16[1] =
1082 htons(m->m_pkthdr.rcvif->if_index);
1083 }
1084 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
1085 rt = rtpurelookup((struct sockaddr *)&sin6);
1086 if (rt != NULL && (rt->rt_flags & RTF_HOST) &&
1087 !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
1088 if (mtu < IPV6_MMTU) { /* XXX */
1089 rt->rt_rmx.rmx_locks |= RTV_MTU;
1090 } else if (mtu < rt->rt_ifp->if_mtu &&
1091 rt->rt_rmx.rmx_mtu > mtu) {
1092 icmp6stat.icp6s_pmtuchg++;
1093 rt->rt_rmx.rmx_mtu = mtu;
1094 }
1095 }
1096 if (rt)
1097 --rt->rt_refcnt;
1098 }
1099
1100 /*
1101 * Process a Node Information Query packet, based on
1102 * draft-ietf-ipngwg-icmp-name-lookups-07.
1103 *
1104 * Spec incompatibilities:
1105 * - IPv6 Subject address handling
1106 * - IPv4 Subject address handling support missing
1107 * - Proxy reply (answer even if it's not for me)
1108 * - joins NI group address at in6_ifattach() time only, does not cope
1109 * with hostname changes by sethostname(3)
1110 */
1111 #define hostnamelen strlen(hostname)
1112 static struct mbuf *
1113 ni6_input(struct mbuf *m, int off)
1114 {
1115 struct icmp6_nodeinfo *ni6, *nni6;
1116 struct mbuf *n = NULL;
1117 u_int16_t qtype;
1118 int subjlen;
1119 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1120 struct ni_reply_fqdn *fqdn;
1121 int addrs; /* for NI_QTYPE_NODEADDR */
1122 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1123 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
1124 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
1125 struct ip6_hdr *ip6;
1126 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1127 char *subj = NULL;
1128 struct in6_ifaddr *ia6 = NULL;
1129
1130 ip6 = mtod(m, struct ip6_hdr *);
1131 #ifndef PULLDOWN_TEST
1132 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1133 #else
1134 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1135 if (ni6 == NULL) {
1136 /* m is already reclaimed */
1137 return NULL;
1138 }
1139 #endif
1140
1141 /*
1142 * Validate IPv6 destination address.
1143 *
1144 * The Responder must discard the Query without further processing
1145 * unless it is one of the Responder's unicast or anycast addresses, or
1146 * a link-local scope multicast address which the Responder has joined.
1147 * [icmp-name-lookups-07, Section 4.]
1148 */
1149 bzero(&sin6, sizeof(sin6));
1150 sin6.sin6_family = AF_INET6;
1151 sin6.sin6_len = sizeof(struct sockaddr_in6);
1152 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
1153 /* XXX scopeid */
1154 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) {
1155 /* unicast/anycast, fine */
1156 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
1157 (icmp6_nodeinfo & 4) == 0) {
1158 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1159 "a temporary address in %s:%d",
1160 __FILE__, __LINE__));
1161 goto bad;
1162 }
1163 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr))
1164 ; /* link-local multicast, fine */
1165 else
1166 goto bad;
1167
1168 /* validate query Subject field. */
1169 qtype = ntohs(ni6->ni_qtype);
1170 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1171 switch (qtype) {
1172 case NI_QTYPE_NOOP:
1173 case NI_QTYPE_SUPTYPES:
1174 /* 07 draft */
1175 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1176 break;
1177 /* FALLTHROUGH */
1178 case NI_QTYPE_FQDN:
1179 case NI_QTYPE_NODEADDR:
1180 switch (ni6->ni_code) {
1181 case ICMP6_NI_SUBJ_IPV6:
1182 #if ICMP6_NI_SUBJ_IPV6 != 0
1183 case 0:
1184 #endif
1185 /*
1186 * backward compatibility - try to accept 03 draft
1187 * format, where no Subject is present.
1188 */
1189 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1190 subjlen == 0) {
1191 oldfqdn++;
1192 break;
1193 }
1194 #if ICMP6_NI_SUBJ_IPV6 != 0
1195 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1196 goto bad;
1197 #endif
1198
1199 if (subjlen != sizeof(sin6.sin6_addr))
1200 goto bad;
1201
1202 /*
1203 * Validate Subject address.
1204 *
1205 * Not sure what exactly "address belongs to the node"
1206 * means in the spec, is it just unicast, or what?
1207 *
1208 * At this moment we consider Subject address as
1209 * "belong to the node" if the Subject address equals
1210 * to the IPv6 destination address; validation for
1211 * IPv6 destination address should have done enough
1212 * check for us.
1213 *
1214 * We do not do proxy at this moment.
1215 */
1216 /* m_pulldown instead of copy? */
1217 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1218 subjlen, (caddr_t)&sin6.sin6_addr);
1219 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, M_NOWAIT, 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, M_NOWAIT, 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 const struct ifnet_array *arr;
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 int i;
1576
1577 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1578 switch (ni6->ni_code) {
1579 case ICMP6_NI_SUBJ_IPV6:
1580 if (subj == NULL) /* must be impossible... */
1581 return (0);
1582 subj_ip6 = (struct sockaddr_in6 *)subj;
1583 break;
1584 default:
1585 /*
1586 * XXX: we only support IPv6 subject address for
1587 * this Qtype.
1588 */
1589 return (0);
1590 }
1591 }
1592
1593 arr = ifnet_array_get();
1594 for (i = 0; i < arr->ifnet_count; ++i) {
1595 struct ifnet *ifp = arr->ifnet_arr[i];
1596 struct ifaddr_container *ifac;
1597
1598 addrsofif = 0;
1599 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link)
1600 {
1601 struct ifaddr *ifa = ifac->ifa;
1602
1603 if (ifa->ifa_addr->sa_family != AF_INET6)
1604 continue;
1605 ifa6 = (struct in6_ifaddr *)ifa;
1606
1607 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1608 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
1609 &ifa6->ia_addr.sin6_addr))
1610 iffound = 1;
1611
1612 /*
1613 * IPv4-mapped addresses can only be returned by a
1614 * Node Information proxy, since they represent
1615 * addresses of IPv4-only nodes, which perforce do
1616 * not implement this protocol.
1617 * [icmp-name-lookups-07, Section 5.4]
1618 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1619 * this function at this moment.
1620 */
1621
1622 /* What do we have to do about ::1? */
1623 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1624 case IPV6_ADDR_SCOPE_LINKLOCAL:
1625 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1626 continue;
1627 break;
1628 case IPV6_ADDR_SCOPE_SITELOCAL:
1629 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1630 continue;
1631 break;
1632 case IPV6_ADDR_SCOPE_GLOBAL:
1633 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1634 continue;
1635 break;
1636 default:
1637 continue;
1638 }
1639
1640 /*
1641 * check if anycast is okay.
1642 * XXX: just experimental. not in the spec.
1643 */
1644 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) &&
1645 !(niflags & NI_NODEADDR_FLAG_ANYCAST))
1646 continue; /* we need only unicast addresses */
1647 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) &&
1648 (icmp6_nodeinfo & 4) == 0) {
1649 continue;
1650 }
1651 addrsofif++; /* count the address */
1652 }
1653 if (iffound) {
1654 *ifpp = ifp;
1655 return (addrsofif);
1656 }
1657
1658 addrs += addrsofif;
1659 }
1660
1661 return (addrs);
1662 }
1663
1664 static int
1665 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
1666 struct ifnet *ifp0, int resid)
1667 {
1668 const struct ifnet_array *arr;
1669 struct in6_ifaddr *ifa6;
1670 int copied = 0, allow_deprecated = 0;
1671 u_char *cp = (u_char *)(nni6 + 1);
1672 int niflags = ni6->ni_flags;
1673 u_int32_t ltime;
1674 int idx, idx_dep = -1;
1675
1676 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1677 return (0); /* needless to copy */
1678
1679 arr = ifnet_array_get();
1680 if (ifp0 == NULL) {
1681 idx = 0;
1682 } else {
1683 for (idx = 0; idx < arr->ifnet_count; ++idx) {
1684 if (arr->ifnet_arr[idx] == ifp0)
1685 break;
1686 }
1687 }
1688
1689 again:
1690
1691 for (; idx < arr->ifnet_count; ++idx) {
1692 struct ifnet *ifp = arr->ifnet_arr[idx];
1693 struct ifaddr_container *ifac;
1694
1695 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1696 struct ifaddr *ifa = ifac->ifa;
1697
1698 if (ifa->ifa_addr->sa_family != AF_INET6)
1699 continue;
1700 ifa6 = (struct in6_ifaddr *)ifa;
1701
1702 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) &&
1703 allow_deprecated == 0) {
1704 /*
1705 * prefererred address should be put before
1706 * deprecated addresses.
1707 */
1708
1709 /* record the interface for later search */
1710 if (idx_dep < 0)
1711 idx_dep = idx;
1712
1713 continue;
1714 }
1715 else if (!(ifa6->ia6_flags & IN6_IFF_DEPRECATED) &&
1716 allow_deprecated != 0)
1717 continue; /* we now collect deprecated addrs */
1718
1719 /* What do we have to do about ::1? */
1720 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1721 case IPV6_ADDR_SCOPE_LINKLOCAL:
1722 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1723 continue;
1724 break;
1725 case IPV6_ADDR_SCOPE_SITELOCAL:
1726 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1727 continue;
1728 break;
1729 case IPV6_ADDR_SCOPE_GLOBAL:
1730 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1731 continue;
1732 break;
1733 default:
1734 continue;
1735 }
1736
1737 /*
1738 * check if anycast is okay.
1739 * XXX: just experimental. not in the spec.
1740 */
1741 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) &&
1742 !(niflags & NI_NODEADDR_FLAG_ANYCAST))
1743 continue;
1744 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) &&
1745 (icmp6_nodeinfo & 4) == 0) {
1746 continue;
1747 }
1748
1749 /* now we can copy the address */
1750 if (resid < sizeof(struct in6_addr) +
1751 sizeof(u_int32_t)) {
1752 /*
1753 * We give up much more copy.
1754 * Set the truncate flag and return.
1755 */
1756 nni6->ni_flags |=
1757 NI_NODEADDR_FLAG_TRUNCATE;
1758 return (copied);
1759 }
1760
1761 /*
1762 * Set the TTL of the address.
1763 * The TTL value should be one of the following
1764 * according to the specification:
1765 *
1766 * 1. The remaining lifetime of a DHCP lease on the
1767 * address, or
1768 * 2. The remaining Valid Lifetime of a prefix from
1769 * which the address was derived through Stateless
1770 * Autoconfiguration.
1771 *
1772 * Note that we currently do not support stateful
1773 * address configuration by DHCPv6, so the former
1774 * case can't happen.
1775 */
1776 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1777 ltime = ND6_INFINITE_LIFETIME;
1778 else {
1779 if (ifa6->ia6_lifetime.ia6t_expire >
1780 time_uptime)
1781 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime);
1782 else
1783 ltime = 0;
1784 }
1785
1786 bcopy(&ltime, cp, sizeof(u_int32_t));
1787 cp += sizeof(u_int32_t);
1788
1789 /* copy the address itself */
1790 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1791 sizeof(struct in6_addr));
1792 /* XXX: KAME link-local hack; remove ifindex */
1793 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr))
1794 ((struct in6_addr *)cp)->s6_addr16[1] = 0;
1795 cp += sizeof(struct in6_addr);
1796
1797 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1798 copied += (sizeof(struct in6_addr) +
1799 sizeof(u_int32_t));
1800 }
1801 if (ifp0) /* we need search only on the specified IF */
1802 break;
1803 }
1804
1805 if (allow_deprecated == 0 && idx_dep >= 0) {
1806 idx = idx_dep;
1807 allow_deprecated = 1;
1808
1809 goto again;
1810 }
1811
1812 return (copied);
1813 }
1814
1815 /*
1816 * XXX almost dup'ed code with rip6_input.
1817 */
1818 static int
1819 icmp6_rip6_input(struct mbuf **mp, int off)
1820 {
1821 struct mbuf *m = *mp;
1822 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1823 struct in6pcb *in6p;
1824 struct in6pcb *last = NULL;
1825 struct sockaddr_in6 rip6src;
1826 struct icmp6_hdr *icmp6;
1827 struct mbuf *opts = NULL;
1828
1829 #ifndef PULLDOWN_TEST
1830 /* this is assumed to be safe. */
1831 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1832 #else
1833 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1834 if (icmp6 == NULL) {
1835 /* m is already reclaimed */
1836 return IPPROTO_DONE;
1837 }
1838 #endif
1839
1840 bzero(&rip6src, sizeof(rip6src));
1841 rip6src.sin6_len = sizeof(struct sockaddr_in6);
1842 rip6src.sin6_family = AF_INET6;
1843 /* KAME hack: recover scopeid */
1844 in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1845
1846 LIST_FOREACH(in6p, &ripcbinfo.pcblisthead, inp_list)
1847 {
1848 if (in6p->inp_flags & INP_PLACEMARKER)
1849 continue;
1850 if (!INP_ISIPV6(in6p))
1851 continue;
1852 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
1853 continue;
1854 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1855 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1856 continue;
1857 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1858 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1859 continue;
1860 if (in6p->in6p_icmp6filt
1861 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1862 in6p->in6p_icmp6filt))
1863 continue;
1864 if (last) {
1865 struct socket *so;
1866 struct mbuf *n;
1867
1868 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1869 if (last->in6p_flags & IN6P_CONTROLOPTS)
1870 ip6_savecontrol(last, &opts, ip6, n);
1871 /* strip intermediate headers */
1872 m_adj(n, off);
1873 so = last->in6p_socket;
1874 lwkt_gettoken(&so->so_rcv.ssb_token);
1875 if (ssb_appendaddr(&so->so_rcv,
1876 (struct sockaddr *)&rip6src,
1877 n, opts) == 0) {
1878 /* should notify about lost packet */
1879 m_freem(n);
1880 if (opts)
1881 m_freem(opts);
1882 } else {
1883 sorwakeup(so);
1884 }
1885 lwkt_reltoken(&so->so_rcv.ssb_token);
1886 opts = NULL;
1887 }
1888 }
1889 last = in6p;
1890 }
1891 if (last) {
1892 struct socket *so;
1893
1894 if (last->in6p_flags & IN6P_CONTROLOPTS)
1895 ip6_savecontrol(last, &opts, ip6, m);
1896 /* strip intermediate headers */
1897 m_adj(m, off);
1898 so = last->in6p_socket;
1899 lwkt_gettoken(&so->so_rcv.ssb_token);
1900 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&rip6src,
1901 m, opts) == 0) {
1902 m_freem(m);
1903 if (opts)
1904 m_freem(opts);
1905 } else {
1906 sorwakeup(so);
1907 }
1908 lwkt_reltoken(&so->so_rcv.ssb_token);
1909 } else {
1910 m_freem(m);
1911 ip6stat.ip6s_delivered--;
1912 }
1913 return IPPROTO_DONE;
1914 }
1915
1916 /*
1917 * Reflect the ip6 packet back to the source.
1918 * OFF points to the icmp6 header, counted from the top of the mbuf.
1919 */
1920 void
1921 icmp6_reflect(struct mbuf *m, size_t off)
1922 {
1923 struct ip6_hdr *ip6;
1924 struct icmp6_hdr *icmp6;
1925 struct in6_ifaddr *ia;
1926 struct in6_addr t, *src = NULL;
1927 int plen;
1928 int type, code;
1929 struct ifnet *outif = NULL;
1930 struct sockaddr_in6 sa6_src, sa6_dst;
1931 #ifdef COMPAT_RFC1885
1932 int mtu = IPV6_MMTU;
1933 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst;
1934 #endif
1935
1936 /* too short to reflect */
1937 if (off < sizeof(struct ip6_hdr)) {
1938 nd6log((LOG_DEBUG,
1939 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
1940 (u_long)off, (u_long)sizeof(struct ip6_hdr),
1941 __FILE__, __LINE__));
1942 goto bad;
1943 }
1944
1945 /*
1946 * If there are extra headers between IPv6 and ICMPv6, strip
1947 * off that header first.
1948 */
1949 #ifdef DIAGNOSTIC
1950 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
1951 panic("assumption failed in icmp6_reflect");
1952 #endif
1953 if (off > sizeof(struct ip6_hdr)) {
1954 size_t l;
1955 struct ip6_hdr nip6;
1956
1957 l = off - sizeof(struct ip6_hdr);
1958 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
1959 m_adj(m, 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 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
1966 } else /* off == sizeof(struct ip6_hdr) */ {
1967 size_t l;
1968 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
1969 if (m->m_len < l) {
1970 if ((m = m_pullup(m, l)) == NULL)
1971 return;
1972 }
1973 }
1974 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
1975 ip6 = mtod(m, struct ip6_hdr *);
1976 ip6->ip6_nxt = IPPROTO_ICMPV6;
1977 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
1978 type = icmp6->icmp6_type; /* keep type for statistics */
1979 code = icmp6->icmp6_code; /* ditto. */
1980
1981 t = ip6->ip6_dst;
1982 /*
1983 * ip6_input() drops a packet if its src is multicast.
1984 * So, the src is never multicast.
1985 */
1986 ip6->ip6_dst = ip6->ip6_src;
1987
1988 /*
1989 * XXX: make sure to embed scope zone information, using
1990 * already embedded IDs or the received interface (if any).
1991 * Note that rcvif may be NULL.
1992 * TODO: scoped routing case (XXX).
1993 */
1994 bzero(&sa6_src, sizeof(sa6_src));
1995 sa6_src.sin6_family = AF_INET6;
1996 sa6_src.sin6_len = sizeof(sa6_src);
1997 sa6_src.sin6_addr = ip6->ip6_dst;
1998 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
1999 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL);
2000 bzero(&sa6_dst, sizeof(sa6_dst));
2001 sa6_dst.sin6_family = AF_INET6;
2002 sa6_dst.sin6_len = sizeof(sa6_dst);
2003 sa6_dst.sin6_addr = t;
2004 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
2005 in6_embedscope(&t, &sa6_dst, NULL, NULL);
2006
2007 #ifdef COMPAT_RFC1885
2008 /*
2009 * xxx guess MTU
2010 * RFC 1885 requires that echo reply should be truncated if it
2011 * does not fit in with (return) path MTU, but the description was
2012 * removed in the new spec.
2013 */
2014 if (icmp6_reflect_rt.ro_rt == 0 ||
2015 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) {
2016 if (icmp6_reflect_rt.ro_rt) {
2017 RTFREE(icmp6_reflect_rt.ro_rt);
2018 icmp6_reflect_rt.ro_rt = 0;
2019 }
2020 bzero(sin6, sizeof(*sin6));
2021 sin6->sin6_family = PF_INET6;
2022 sin6->sin6_len = sizeof(struct sockaddr_in6);
2023 sin6->sin6_addr = ip6->ip6_dst;
2024
2025 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt,
2026 RTF_PRCLONING);
2027 }
2028
2029 if (icmp6_reflect_rt.ro_rt == 0)
2030 goto bad;
2031
2032 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST)
2033 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu)
2034 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu;
2035
2036 if (mtu < m->m_pkthdr.len) {
2037 plen -= (m->m_pkthdr.len - mtu);
2038 m_adj(m, mtu - m->m_pkthdr.len);
2039 }
2040 #endif
2041 /*
2042 * If the incoming packet was addressed directly to us(i.e. unicast),
2043 * use dst as the src for the reply.
2044 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible
2045 * (for example) when we encounter an error while forwarding procedure
2046 * destined to a duplicated address of ours.
2047 */
2048 for (ia = in6_ifaddr; ia; ia = ia->ia_next)
2049 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
2050 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2051 src = &t;
2052 break;
2053 }
2054 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
2055 /*
2056 * This is the case if the dst is our link-local address
2057 * and the sender is also ourselves.
2058 */
2059 src = &t;
2060 }
2061
2062 if (src == NULL) {
2063 int e;
2064 struct route_in6 ro;
2065
2066 /*
2067 * This case matches to multicasts, our anycast, or unicasts
2068 * that we do not own. Select a source address based on the
2069 * source address of the erroneous packet.
2070 */
2071 bzero(&ro, sizeof(ro));
2072 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e, NULL);
2073 if (ro.ro_rt)
2074 RTFREE(ro.ro_rt); /* XXX: we could use this */
2075 if (src == NULL) {
2076 nd6log((LOG_DEBUG,
2077 "icmp6_reflect: source can't be determined: "
2078 "dst=%s, error=%d\n",
2079 ip6_sprintf(&sa6_src.sin6_addr), e));
2080 goto bad;
2081 }
2082 }
2083
2084 ip6->ip6_src = *src;
2085
2086 ip6->ip6_flow = 0;
2087 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2088 ip6->ip6_vfc |= IPV6_VERSION;
2089 ip6->ip6_nxt = IPPROTO_ICMPV6;
2090 if (m->m_pkthdr.rcvif) {
2091 /* XXX: This may not be the outgoing interface */
2092 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2093 if (ip6->ip6_hlim < ip6_minhlim)
2094 ip6->ip6_hlim = ip6_minhlim;
2095 } else {
2096 ip6->ip6_hlim = ip6_defhlim;
2097 }
2098
2099 icmp6->icmp6_cksum = 0;
2100 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2101 sizeof(struct ip6_hdr), plen);
2102
2103 /*
2104 * XXX option handling
2105 */
2106
2107 m->m_flags &= ~(M_BCAST|M_MCAST);
2108
2109 #ifdef COMPAT_RFC1885
2110 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL);
2111 #else
2112 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2113 #endif
2114 if (outif)
2115 icmp6_ifoutstat_inc(outif, type, code);
2116
2117 return;
2118
2119 bad:
2120 m_freem(m);
2121 return;
2122 }
2123
2124 void
2125 icmp6_fasttimo(void)
2126 {
2127
2128 mld6_fasttimeo();
2129 }
2130
2131 static const char *
2132 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
2133 struct in6_addr *tgt6)
2134 {
2135 static char buf[1024];
2136 ksnprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2137 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
2138 return buf;
2139 }
2140
2141 void
2142 icmp6_redirect_input(struct mbuf *m, int off)
2143 {
2144 struct ifnet *ifp = m->m_pkthdr.rcvif;
2145 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2146 struct nd_redirect *nd_rd;
2147 int icmp6len = ntohs(ip6->ip6_plen);
2148 char *lladdr = NULL;
2149 int lladdrlen = 0;
2150 #if 0
2151 u_char *redirhdr = NULL;
2152 int redirhdrlen = 0;
2153 #endif
2154 struct rtentry *rt = NULL;
2155 int is_router;
2156 int is_onlink;
2157 struct in6_addr src6 = ip6->ip6_src;
2158 struct in6_addr redtgt6;
2159 struct in6_addr reddst6;
2160 union nd_opts ndopts;
2161
2162 if (!m || !ifp)
2163 return;
2164
2165 /* XXX if we are router, we don't update route by icmp6 redirect */
2166 if (ip6_forwarding)
2167 goto freeit;
2168 if (!icmp6_rediraccept)
2169 goto freeit;
2170
2171 #ifndef PULLDOWN_TEST
2172 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2173 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2174 #else
2175 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2176 if (nd_rd == NULL) {
2177 icmp6stat.icp6s_tooshort++;
2178 return;
2179 }
2180 #endif
2181 redtgt6 = nd_rd->nd_rd_target;
2182 reddst6 = nd_rd->nd_rd_dst;
2183
2184 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2185 redtgt6.s6_addr16[1] = htons(ifp->if_index);
2186 if (IN6_IS_ADDR_LINKLOCAL(&reddst6))
2187 reddst6.s6_addr16[1] = htons(ifp->if_index);
2188
2189 /* validation */
2190 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2191 nd6log((LOG_ERR,
2192 "ICMP6 redirect sent from %s rejected; "
2193 "must be from linklocal\n", ip6_sprintf(&src6)));
2194 goto bad;
2195 }
2196 if (ip6->ip6_hlim != 255) {
2197 nd6log((LOG_ERR,
2198 "ICMP6 redirect sent from %s rejected; "
2199 "hlim=%d (must be 255)\n",
2200 ip6_sprintf(&src6), ip6->ip6_hlim));
2201 goto bad;
2202 }
2203 {
2204 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2205 struct sockaddr_in6 sin6;
2206 struct in6_addr *gw6;
2207
2208 bzero(&sin6, sizeof(sin6));
2209 sin6.sin6_family = AF_INET6;
2210 sin6.sin6_len = sizeof(struct sockaddr_in6);
2211 bcopy(&reddst6, &sin6.sin6_addr, sizeof reddst6);
2212 rt = rtpurelookup((struct sockaddr *)&sin6);
2213 if (rt != NULL) {
2214 if (rt->rt_gateway == NULL ||
2215 rt->rt_gateway->sa_family != AF_INET6) {
2216 nd6log((LOG_ERR,
2217 "ICMP6 redirect rejected; no route "
2218 "with inet6 gateway found for redirect dst: %s\n",
2219 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2220 --rt->rt_refcnt;
2221 goto bad;
2222 }
2223
2224 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2225 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2226 nd6log((LOG_ERR,
2227 "ICMP6 redirect rejected; "
2228 "not equal to gw-for-src=%s (must be same): "
2229 "%s\n",
2230 ip6_sprintf(gw6),
2231 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2232 --rt->rt_refcnt;
2233 goto bad;
2234 }
2235 } else {
2236 nd6log((LOG_ERR,
2237 "ICMP6 redirect rejected; "
2238 "no route found for redirect dst: %s\n",
2239 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2240 goto bad;
2241 }
2242 --rt->rt_refcnt;
2243 rt = NULL;
2244 }
2245 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2246 nd6log((LOG_ERR,
2247 "ICMP6 redirect rejected; "
2248 "redirect dst must be unicast: %s\n",
2249 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2250 goto bad;
2251 }
2252
2253 is_router = is_onlink = 0;
2254 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2255 is_router = 1; /* router case */
2256 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2257 is_onlink = 1; /* on-link destination case */
2258 if (!is_router && !is_onlink) {
2259 nd6log((LOG_ERR,
2260 "ICMP6 redirect rejected; "
2261 "neither router case nor onlink case: %s\n",
2262 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2263 goto bad;
2264 }
2265 /* validation passed */
2266
2267 icmp6len -= sizeof(*nd_rd);
2268 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2269 if (nd6_options(&ndopts) < 0) {
2270 nd6log((LOG_INFO, "icmp6_redirect_input: "
2271 "invalid ND option, rejected: %s\n",
2272 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2273 /* nd6_options have incremented stats */
2274 goto freeit;
2275 }
2276
2277 if (ndopts.nd_opts_tgt_lladdr) {
2278 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2279 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2280 }
2281
2282 #if 0
2283 if (ndopts.nd_opts_rh) {
2284 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2285 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2286 }
2287 #endif
2288
2289 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2290 nd6log((LOG_INFO,
2291 "icmp6_redirect_input: lladdrlen mismatch for %s "
2292 "(if %d, icmp6 packet %d): %s\n",
2293 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
2294 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2295 goto bad;
2296 }
2297
2298 /* RFC 2461 8.3 */
2299 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2300 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2301
2302 if (!is_onlink) { /* better router case. perform rtredirect. */
2303 /* perform rtredirect */
2304 struct sockaddr_in6 sdst;
2305 struct sockaddr_in6 sgw;
2306 struct sockaddr_in6 ssrc;
2307
2308 bzero(&sdst, sizeof(sdst));
2309 bzero(&sgw, sizeof(sgw));
2310 bzero(&ssrc, sizeof(ssrc));
2311 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2312 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2313 sizeof(struct sockaddr_in6);
2314 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2315 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2316 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2317 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
2318 NULL, RTF_GATEWAY | RTF_HOST,
2319 (struct sockaddr *)&ssrc);
2320 }
2321 /* finally update cached route in each socket via kpfctlinput */
2322 {
2323 struct sockaddr_in6 sdst;
2324
2325 bzero(&sdst, sizeof(sdst));
2326 sdst.sin6_family = AF_INET6;
2327 sdst.sin6_len = sizeof(struct sockaddr_in6);
2328 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2329 kpfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2330 #ifdef IPSEC
2331 key_sa_routechange((struct sockaddr *)&sdst);
2332 #endif
2333 }
2334
2335 freeit:
2336 m_freem(m);
2337 return;
2338
2339 bad:
2340 icmp6stat.icp6s_badredirect++;
2341 m_freem(m);
2342 }
2343
2344 void
2345 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
2346 {
2347 struct ifnet *ifp; /* my outgoing interface */
2348 struct in6_addr *ifp_ll6;
2349 struct in6_addr *router_ll6;
2350 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2351 struct mbuf *m = NULL; /* newly allocated one */
2352 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2353 struct nd_redirect *nd_rd;
2354 size_t maxlen;
2355 u_char *p;
2356 struct ifnet *outif = NULL;
2357 struct sockaddr_in6 src_sa;
2358
2359 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2360
2361 /* if we are not router, we don't send icmp6 redirect */
2362 if (!ip6_forwarding || ip6_accept_rtadv)
2363 goto fail;
2364
2365 /* sanity check */
2366 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2367 goto fail;
2368
2369 /*
2370 * Address check:
2371 * the source address must identify a neighbor, and
2372 * the destination address must not be a multicast address
2373 * [RFC 2461, sec 8.2]
2374 */
2375 sip6 = mtod(m0, struct ip6_hdr *);
2376 bzero(&src_sa, sizeof(src_sa));
2377 src_sa.sin6_family = AF_INET6;
2378 src_sa.sin6_len = sizeof(src_sa);
2379 src_sa.sin6_addr = sip6->ip6_src;
2380 /* we don't currently use sin6_scope_id, but eventually use it */
2381 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src);
2382 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2383 goto fail;
2384 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2385 goto fail; /* what should we do here? */
2386
2387 /* rate limit */
2388 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2389 goto fail;
2390
2391 /*
2392 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2393 * we almost always ask for an mbuf cluster for simplicity.
2394 * (MHLEN < IPV6_MMTU is almost always true)
2395 */
2396 #if IPV6_MMTU >= MCLBYTES
2397 # error assumption failed about IPV6_MMTU and MCLBYTES
2398 #endif
2399 m = m_getb(IPV6_MMTU, M_NOWAIT, MT_HEADER, M_PKTHDR);
2400 if (!m)
2401 goto fail;
2402 m->m_len = 0;
2403 maxlen = M_TRAILINGSPACE(m);
2404 maxlen = min(IPV6_MMTU, maxlen);
2405 /* just for safety */
2406 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2407 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2408 goto fail;
2409 }
2410
2411 {
2412 /* get ip6 linklocal address for ifp(my outgoing interface). */
2413 struct in6_ifaddr *ia;
2414 if ((ia = in6ifa_ifpforlinklocal(ifp,
2415 IN6_IFF_NOTREADY|
2416 IN6_IFF_ANYCAST)) == NULL)
2417 goto fail;
2418 ifp_ll6 = &ia->ia_addr.sin6_addr;
2419 }
2420
2421 /* get ip6 linklocal address for the router. */
2422 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2423 struct sockaddr_in6 *sin6;
2424 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2425 router_ll6 = &sin6->sin6_addr;
2426 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2427 router_ll6 = NULL;
2428 } else
2429 router_ll6 = NULL;
2430
2431 /* ip6 */
2432 ip6 = mtod(m, struct ip6_hdr *);
2433 ip6->ip6_flow = 0;
2434 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2435 ip6->ip6_vfc |= IPV6_VERSION;
2436 /* ip6->ip6_plen will be set later */
2437 ip6->ip6_nxt = IPPROTO_ICMPV6;
2438 ip6->ip6_hlim = 255;
2439 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2440 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2441 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2442
2443 /* ND Redirect */
2444 nd_rd = (struct nd_redirect *)(ip6 + 1);
2445 nd_rd->nd_rd_type = ND_REDIRECT;
2446 nd_rd->nd_rd_code = 0;
2447 nd_rd->nd_rd_reserved = 0;
2448 if (rt->rt_flags & RTF_GATEWAY) {
2449 /*
2450 * nd_rd->nd_rd_target must be a link-local address in
2451 * better router cases.
2452 */
2453 if (!router_ll6)
2454 goto fail;
2455 bcopy(router_ll6, &nd_rd->nd_rd_target,
2456 sizeof(nd_rd->nd_rd_target));
2457 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2458 sizeof(nd_rd->nd_rd_dst));
2459 } else {
2460 /* make sure redtgt == reddst */
2461 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2462 sizeof(nd_rd->nd_rd_target));
2463 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2464 sizeof(nd_rd->nd_rd_dst));
2465 }
2466
2467 p = (u_char *)(nd_rd + 1);
2468
2469 if (!router_ll6)
2470 goto nolladdropt;
2471
2472 {
2473 /* target lladdr option */
2474 struct rtentry *rt_router = NULL;
2475 int len;
2476 struct sockaddr_dl *sdl;
2477 struct nd_opt_hdr *nd_opt;
2478 char *lladdr;
2479
2480 rt_router = nd6_lookup(router_ll6, 0, ifp);
2481 if (!rt_router)
2482 goto nolladdropt;
2483 len = sizeof(*nd_opt) + ifp->if_addrlen;
2484 len = (len + 7) & ~7; /* round by 8 */
2485 /* safety check */
2486 if (len + (p - (u_char *)ip6) > maxlen)
2487 goto nolladdropt;
2488 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2489 (rt_router->rt_flags & RTF_LLINFO) &&
2490 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2491 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
2492 sdl->sdl_alen) {
2493 nd_opt = (struct nd_opt_hdr *)p;
2494 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2495 nd_opt->nd_opt_len = len >> 3;
2496 lladdr = (char *)(nd_opt + 1);
2497 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2498 p += len;
2499 }
2500 }
2501 nolladdropt:;
2502
2503 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2504
2505 /* just to be safe */
2506 #ifdef M_DECRYPTED /*not openbsd*/
2507 if (m0->m_flags & M_DECRYPTED)
2508 goto noredhdropt;
2509 #endif
2510 if (p - (u_char *)ip6 > maxlen)
2511 goto noredhdropt;
2512
2513 {
2514 /* redirected header option */
2515 int len;
2516 struct nd_opt_rd_hdr *nd_opt_rh;
2517
2518 /*
2519 * compute the maximum size for icmp6 redirect header option.
2520 * XXX room for auth header?
2521 */
2522 len = maxlen - (p - (u_char *)ip6);
2523 len &= ~7;
2524
2525 /* This is just for simplicity. */
2526 if (m0->m_pkthdr.len != m0->m_len) {
2527 if (m0->m_next) {
2528 m_freem(m0->m_next);
2529 m0->m_next = NULL;
2530 }
2531 m0->m_pkthdr.len = m0->m_len;
2532 }
2533
2534 /*
2535 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2536 * about padding/truncate rule for the original IP packet.
2537 * From the discussion on IPv6imp in Feb 1999, the consensus was:
2538 * - "attach as much as possible" is the goal
2539 * - pad if not aligned (original size can be guessed by original
2540 * ip6 header)
2541 * Following code adds the padding if it is simple enough,
2542 * and truncates if not.
2543 */
2544 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2545 panic("assumption failed in %s:%d", __FILE__, __LINE__);
2546
2547 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2548 /* not enough room, truncate */
2549 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2550 } else {
2551 /* enough room, pad or truncate */
2552 size_t extra;
2553
2554 extra = m0->m_pkthdr.len % 8;
2555 if (extra) {
2556 /* pad if easy enough, truncate if not */
2557 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2558 /* pad */
2559 m0->m_len += (8 - extra);
2560 m0->m_pkthdr.len += (8 - extra);
2561 } else {
2562 /* truncate */
2563 m0->m_pkthdr.len -= extra;
2564 m0->m_len -= extra;
2565 }
2566 }
2567 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2568 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2569 }
2570
2571 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2572 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2573 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2574 nd_opt_rh->nd_opt_rh_len = len >> 3;
2575 p += sizeof(*nd_opt_rh);
2576 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2577
2578 /* connect m0 to m */
2579 m->m_next = m0;
2580 m->m_pkthdr.len = m->m_len + m0->m_len;
2581 }
2582 noredhdropt:;
2583
2584 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src))
2585 sip6->ip6_src.s6_addr16[1] = 0;
2586 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst))
2587 sip6->ip6_dst.s6_addr16[1] = 0;
2588 #if 0
2589 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
2590 ip6->ip6_src.s6_addr16[1] = 0;
2591 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
2592 ip6->ip6_dst.s6_addr16[1] = 0;
2593 #endif
2594 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target))
2595 nd_rd->nd_rd_target.s6_addr16[1] = 0;
2596 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst))
2597 nd_rd->nd_rd_dst.s6_addr16[1] = 0;
2598
2599 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2600
2601 nd_rd->nd_rd_cksum = 0;
2602 nd_rd->nd_rd_cksum
2603 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2604
2605 /* send the packet to outside... */
2606 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2607 if (outif) {
2608 icmp6_ifstat_inc(outif, ifs6_out_msg);
2609 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2610 }
2611 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2612
2613 return;
2614
2615 fail:
2616 if (m)
2617 m_freem(m);
2618 if (m0)
2619 m_freem(m0);
2620 }
2621
2622 #ifdef HAVE_NRL_INPCB
2623 #define in6pcb inpcb
2624 #define in6p_icmp6filt inp_icmp6filt
2625 #endif
2626 /*
2627 * ICMPv6 socket option processing.
2628 */
2629 void
2630 icmp6_ctloutput(netmsg_t msg)
2631 {
2632 struct socket *so = msg->ctloutput.base.nm_so;
2633 struct sockopt *sopt = msg->ctloutput.nm_sopt;
2634 int error = 0;
2635 int optlen;
2636 struct inpcb *inp = so->so_pcb;
2637 int level, op, optname;
2638
2639 if (sopt) {
2640 level = sopt->sopt_level;
2641 op = sopt->sopt_dir;
2642 optname = sopt->sopt_name;
2643 optlen = sopt->sopt_valsize;
2644 } else
2645 level = op = optname = optlen = 0;
2646
2647 if (level != IPPROTO_ICMPV6) {
2648 error = EINVAL;
2649 goto out;
2650 }
2651
2652 switch (op) {
2653 case PRCO_SETOPT:
2654 switch (optname) {
2655 case ICMP6_FILTER:
2656 {
2657 if (optlen != sizeof(struct icmp6_filter)) {
2658 error = EMSGSIZE;
2659 break;
2660 }
2661 if (inp->in6p_icmp6filt == NULL) {
2662 error = EINVAL;
2663 break;
2664 }
2665 error = soopt_to_kbuf(sopt, inp->in6p_icmp6filt, optlen,
2666 optlen);
2667 break;
2668 }
2669
2670 default:
2671 error = ENOPROTOOPT;
2672 break;
2673 }
2674 break;
2675
2676 case PRCO_GETOPT:
2677 switch (optname) {
2678 case ICMP6_FILTER:
2679 {
2680 if (inp->in6p_icmp6filt == NULL) {
2681 error = EINVAL;
2682 break;
2683 }
2684 soopt_from_kbuf(sopt, inp->in6p_icmp6filt,
2685 sizeof(struct icmp6_filter));
2686 break;
2687 }
2688
2689 default:
2690 error = ENOPROTOOPT;
2691 break;
2692 }
2693 break;
2694 }
2695 out:
2696 lwkt_replymsg(&msg->ctloutput.base.lmsg, error);
2697 }
2698 #ifdef HAVE_NRL_INPCB
2699 #undef in6pcb
2700 #undef in6p_icmp6filt
2701 #endif
2702
2703 #ifndef HAVE_PPSRATECHECK
2704 #ifndef timersub
2705 #define timersub(tvp, uvp, vvp) \
2706 do { \
2707 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
2708 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
2709 if ((vvp)->tv_usec < 0) { \
2710 (vvp)->tv_sec--; \
2711 (vvp)->tv_usec += 1000000; \
2712 } \
2713 } while (0)
2714 #endif
2715
2716 /*
2717 * ppsratecheck(): packets (or events) per second limitation.
2718 */
2719 static int
2720 ppsratecheck(struct timeval *lasttime, int *curpps,
2721 int maxpps) /* maximum pps allowed */
2722 {
2723 struct timeval tv, delta;
2724 int rv;
2725
2726 microtime(&tv);
2727
2728 timersub(&tv, lasttime, &delta);
2729
2730 /*
2731 * Check for 0,0 so that the message will be seen at least once.
2732 * If more than one second has passed since the last update of
2733 * lasttime, reset the counter.
2734 *
2735 * We do increment *curpps even in *curpps < maxpps case, as some may
2736 * try to use *curpps for stat purposes as well.
2737 */
2738 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
2739 delta.tv_sec >= 1) {
2740 *lasttime = tv;
2741 *curpps = 0;
2742 rv = 1;
2743 } else if (maxpps < 0)
2744 rv = 1;
2745 else if (*curpps < maxpps)
2746 rv = 1;
2747 else
2748 rv = 0;
2749
2750 #if 1 /* DIAGNOSTIC? */
2751 /* be careful about wrap-around */
2752 if (*curpps + 1 > *curpps)
2753 *curpps = *curpps + 1;
2754 #else
2755 /*
2756 * assume that there's not too many calls to this function.
2757 * not sure if the assumption holds, as it depends on *caller's*
2758 * behavior, not the behavior of this function.
2759 * IMHO it is wrong to make assumption on the caller's behavior,
2760 * so the above #if is #if 1, not #ifdef DIAGNOSTIC.
2761 */
2762 *curpps = *curpps + 1;
2763 #endif
2764
2765 return (rv);
2766 }
2767 #endif
2768
2769 /*
2770 * Perform rate limit check.
2771 * Returns 0 if it is okay to send the icmp6 packet.
2772 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2773 * limitation.
2774 *
2775 * XXX per-destination/type check necessary?
2776 */
2777 static int
2778 icmp6_ratelimit(const struct in6_addr *dst, /* not used at this moment */
2779 const int type, /* not used at this moment */
2780 const int code) /* not used at this moment */
2781 {
2782 int ret;
2783
2784 ret = 0; /* okay to send */
2785
2786 /* PPS limit */
2787 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2788 icmp6errppslim)) {
2789 /* The packet is subject to rate limit */
2790 ret++;
2791 }
2792
2793 return ret;
2794 }
DragonFly BSD