]> git.saurik.com Git - apple/xnu.git/blob - bsd/netinet6/icmp6.c
projects / apple / xnu.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
xnu-344.49.tar.gz
[apple/xnu.git] / bsd / netinet6 / icmp6.c
1 /* $FreeBSD: src/sys/netinet6/icmp6.c,v 1.6.2.6 2001/07/10 09:44:16 ume 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. All advertising materials mentioning features or use of this software
46 * must display the following acknowledgement:
47 * This product includes software developed by the University of
48 * California, Berkeley and its contributors.
49 * 4. Neither the name of the University nor the names of its contributors
50 * may be used to endorse or promote products derived from this software
51 * without specific prior written permission.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63 * SUCH DAMAGE.
64 *
65 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
66 */
67
68
69 #include <sys/param.h>
70 #include <sys/systm.h>
71 #include <sys/malloc.h>
72 #include <sys/mbuf.h>
73 #include <sys/protosw.h>
74 #include <sys/socket.h>
75 #include <sys/socketvar.h>
76 #include <sys/time.h>
77 #include <sys/kernel.h>
78 #include <sys/syslog.h>
79 #include <sys/domain.h>
80
81 #include <net/if.h>
82 #include <net/route.h>
83 #include <net/if_dl.h>
84 #include <net/if_types.h>
85
86 #include <netinet/in.h>
87 #include <netinet/in_var.h>
88 #include <netinet/ip6.h>
89 #include <netinet6/ip6_var.h>
90 #include <netinet/icmp6.h>
91 #include <netinet6/mld6_var.h>
92 #include <netinet/in_pcb.h>
93 #include <netinet6/in6_pcb.h>
94 #include <netinet6/nd6.h>
95 #include <netinet6/in6_ifattach.h>
96 #include <netinet6/ip6protosw.h>
97
98 #if IPSEC
99 #include <netinet6/ipsec.h>
100 #include <netkey/key.h>
101
102 extern int ipsec_bypass;
103 #endif
104
105 #include "faith.h"
106 #if defined(NFAITH) && 0 < NFAITH
107 #include <net/if_faith.h>
108 #endif
109
110 #include <net/net_osdep.h>
111
112 #if HAVE_NRL_INPCB
113 /* inpcb members */
114 #define in6pcb inpcb
115 #define in6p_laddr inp_laddr6
116 #define in6p_faddr inp_faddr6
117 #define in6p_icmp6filt inp_icmp6filt
118 #define in6p_route inp_route
119 #define in6p_socket inp_socket
120 #define in6p_flags inp_flags
121 #define in6p_moptions inp_moptions6
122 #define in6p_outputopts inp_outputopts6
123 #define in6p_ip6 inp_ipv6
124 #define in6p_flowinfo inp_flowinfo
125 #define in6p_sp inp_sp
126 #define in6p_next inp_next
127 #define in6p_prev inp_prev
128 /* macro names */
129 #define sotoin6pcb sotoinpcb
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 extern struct domain inet6domain;
142 extern struct ip6protosw inet6sw[];
143 extern struct ip6protosw *ip6_protox[];
144
145 struct icmp6stat icmp6stat;
146
147 extern struct inpcbhead ripcb;
148 extern int icmp6errppslim;
149 static int icmp6errpps_count = 0;
150 static struct timeval icmp6errppslim_last;
151 extern int icmp6_nodeinfo;
152
153 static void icmp6_errcount __P((struct icmp6errstat *, int, int));
154 static int icmp6_rip6_input __P((struct mbuf **, int));
155 static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int));
156 static const char *icmp6_redirect_diag __P((struct in6_addr *,
157 struct in6_addr *, struct in6_addr *));
158 #ifndef HAVE_PPSRATECHECK
159 static int ppsratecheck __P((struct timeval *, int *, int));
160 #endif
161 static struct mbuf *ni6_input __P((struct mbuf *, int));
162 static struct mbuf *ni6_nametodns __P((const char *, int, int));
163 static int ni6_dnsmatch __P((const char *, int, const char *, int));
164 static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *,
165 struct ifnet **, char *));
166 static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
167 struct ifnet *, int));
168 static int icmp6_notify_error __P((struct mbuf *, int, int, int));
169
170 #ifdef COMPAT_RFC1885
171 static struct route_in6 icmp6_reflect_rt;
172 #endif
173
174
175 void
176 icmp6_init()
177 {
178 mld6_init();
179 }
180
181 static void
182 icmp6_errcount(stat, type, code)
183 struct icmp6errstat *stat;
184 int type, code;
185 {
186 switch (type) {
187 case ICMP6_DST_UNREACH:
188 switch (code) {
189 case ICMP6_DST_UNREACH_NOROUTE:
190 stat->icp6errs_dst_unreach_noroute++;
191 return;
192 case ICMP6_DST_UNREACH_ADMIN:
193 stat->icp6errs_dst_unreach_admin++;
194 return;
195 case ICMP6_DST_UNREACH_BEYONDSCOPE:
196 stat->icp6errs_dst_unreach_beyondscope++;
197 return;
198 case ICMP6_DST_UNREACH_ADDR:
199 stat->icp6errs_dst_unreach_addr++;
200 return;
201 case ICMP6_DST_UNREACH_NOPORT:
202 stat->icp6errs_dst_unreach_noport++;
203 return;
204 }
205 break;
206 case ICMP6_PACKET_TOO_BIG:
207 stat->icp6errs_packet_too_big++;
208 return;
209 case ICMP6_TIME_EXCEEDED:
210 switch (code) {
211 case ICMP6_TIME_EXCEED_TRANSIT:
212 stat->icp6errs_time_exceed_transit++;
213 return;
214 case ICMP6_TIME_EXCEED_REASSEMBLY:
215 stat->icp6errs_time_exceed_reassembly++;
216 return;
217 }
218 break;
219 case ICMP6_PARAM_PROB:
220 switch (code) {
221 case ICMP6_PARAMPROB_HEADER:
222 stat->icp6errs_paramprob_header++;
223 return;
224 case ICMP6_PARAMPROB_NEXTHEADER:
225 stat->icp6errs_paramprob_nextheader++;
226 return;
227 case ICMP6_PARAMPROB_OPTION:
228 stat->icp6errs_paramprob_option++;
229 return;
230 }
231 break;
232 case ND_REDIRECT:
233 stat->icp6errs_redirect++;
234 return;
235 }
236 stat->icp6errs_unknown++;
237 }
238
239 /*
240 * Generate an error packet of type error in response to bad IP6 packet.
241 */
242 void
243 icmp6_error(m, type, code, param)
244 struct mbuf *m;
245 int type, code, param;
246 {
247 struct ip6_hdr *oip6, *nip6;
248 struct icmp6_hdr *icmp6;
249 u_int preplen;
250 int off;
251 int nxt;
252
253 icmp6stat.icp6s_error++;
254
255 /* count per-type-code statistics */
256 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
257
258 #ifdef M_DECRYPTED /*not openbsd*/
259 if (m->m_flags & M_DECRYPTED) {
260 icmp6stat.icp6s_canterror++;
261 goto freeit;
262 }
263 #endif
264
265 #ifndef PULLDOWN_TEST
266 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
267 #else
268 if (m->m_len < sizeof(struct ip6_hdr)) {
269 m = m_pullup(m, sizeof(struct ip6_hdr));
270 if (m == NULL)
271 return;
272 }
273 #endif
274 oip6 = mtod(m, struct ip6_hdr *);
275
276 /*
277 * Multicast destination check. For unrecognized option errors,
278 * this check has already done in ip6_unknown_opt(), so we can
279 * check only for other errors.
280 */
281 if ((m->m_flags & (M_BCAST|M_MCAST) ||
282 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
283 (type != ICMP6_PACKET_TOO_BIG &&
284 (type != ICMP6_PARAM_PROB ||
285 code != ICMP6_PARAMPROB_OPTION)))
286 goto freeit;
287
288 /* Source address check. XXX: the case of anycast source? */
289 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
290 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
291 goto freeit;
292
293 /*
294 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
295 * don't do it.
296 */
297 nxt = -1;
298 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
299 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
300 struct icmp6_hdr *icp;
301
302 #ifndef PULLDOWN_TEST
303 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
304 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
305 #else
306 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
307 sizeof(*icp));
308 if (icp == NULL) {
309 icmp6stat.icp6s_tooshort++;
310 return;
311 }
312 #endif
313 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
314 icp->icmp6_type == ND_REDIRECT) {
315 /*
316 * ICMPv6 error
317 * Special case: for redirect (which is
318 * informational) we must not send icmp6 error.
319 */
320 icmp6stat.icp6s_canterror++;
321 goto freeit;
322 } else {
323 /* ICMPv6 informational - send the error */
324 }
325 } else {
326 /* non-ICMPv6 - send the error */
327 }
328
329 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
330
331 /* Finally, do rate limitation check. */
332 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
333 icmp6stat.icp6s_toofreq++;
334 goto freeit;
335 }
336
337 /*
338 * OK, ICMP6 can be generated.
339 */
340
341 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
342 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
343
344 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
345 M_PREPEND(m, preplen, M_DONTWAIT);
346 if (m && m->m_len < preplen)
347 m = m_pullup(m, preplen);
348 if (m == NULL) {
349 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
350 return;
351 }
352
353 nip6 = mtod(m, struct ip6_hdr *);
354 nip6->ip6_src = oip6->ip6_src;
355 nip6->ip6_dst = oip6->ip6_dst;
356
357 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
358 oip6->ip6_src.s6_addr16[1] = 0;
359 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
360 oip6->ip6_dst.s6_addr16[1] = 0;
361
362 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
363 icmp6->icmp6_type = type;
364 icmp6->icmp6_code = code;
365 icmp6->icmp6_pptr = htonl((u_int32_t)param);
366
367 /*
368 * icmp6_reflect() is designed to be in the input path.
369 * icmp6_error() can be called from both input and outut path,
370 * and if we are in output path rcvif could contain bogus value.
371 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
372 * information in ip header (nip6).
373 */
374 m->m_pkthdr.rcvif = NULL;
375
376 icmp6stat.icp6s_outhist[type]++;
377 icmp6_reflect(m, sizeof(struct ip6_hdr)); /*header order: IPv6 - ICMPv6*/
378
379 return;
380
381 freeit:
382 /*
383 * If we can't tell wheter or not we can generate ICMP6, free it.
384 */
385 m_freem(m);
386 }
387
388 /*
389 * Process a received ICMP6 message.
390 */
391 int
392 icmp6_input(mp, offp, proto)
393 struct mbuf **mp;
394 int *offp, proto;
395 {
396 struct mbuf *m = *mp, *n;
397 struct ip6_hdr *ip6, *nip6;
398 struct icmp6_hdr *icmp6, *nicmp6;
399 int off = *offp;
400 int icmp6len = m->m_pkthdr.len - *offp;
401 int code, sum, noff;
402
403 #ifndef PULLDOWN_TEST
404 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
405 /* m might change if M_LOOP. So, call mtod after this */
406 #endif
407
408 /*
409 * Locate icmp6 structure in mbuf, and check
410 * that not corrupted and of at least minimum length
411 */
412
413 ip6 = mtod(m, struct ip6_hdr *);
414 if (icmp6len < sizeof(struct icmp6_hdr)) {
415 icmp6stat.icp6s_tooshort++;
416 goto freeit;
417 }
418
419 /*
420 * calculate the checksum
421 */
422 #ifndef PULLDOWN_TEST
423 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
424 #else
425 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
426 if (icmp6 == NULL) {
427 icmp6stat.icp6s_tooshort++;
428 return IPPROTO_DONE;
429 }
430 #endif
431 code = icmp6->icmp6_code;
432
433 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
434 nd6log((LOG_ERR,
435 "ICMP6 checksum error(%d|%x) %s\n",
436 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
437 icmp6stat.icp6s_checksum++;
438 goto freeit;
439 }
440
441 #if defined(NFAITH) && 0 < NFAITH
442 if (faithprefix(&ip6->ip6_dst)) {
443 /*
444 * Deliver very specific ICMP6 type only.
445 * This is important to deilver TOOBIG. Otherwise PMTUD
446 * will not work.
447 */
448 switch (icmp6->icmp6_type) {
449 case ICMP6_DST_UNREACH:
450 case ICMP6_PACKET_TOO_BIG:
451 case ICMP6_TIME_EXCEEDED:
452 break;
453 default:
454 goto freeit;
455 }
456 }
457 #endif
458
459 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
460 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
461 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
462 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
463
464 switch (icmp6->icmp6_type) {
465 case ICMP6_DST_UNREACH:
466 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
467 switch (code) {
468 case ICMP6_DST_UNREACH_NOROUTE:
469 code = PRC_UNREACH_NET;
470 break;
471 case ICMP6_DST_UNREACH_ADMIN:
472 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
473 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
474 break;
475 case ICMP6_DST_UNREACH_ADDR:
476 code = PRC_HOSTDEAD;
477 break;
478 #ifdef COMPAT_RFC1885
479 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
480 code = PRC_UNREACH_SRCFAIL;
481 break;
482 #else
483 case ICMP6_DST_UNREACH_BEYONDSCOPE:
484 /* I mean "source address was incorrect." */
485 code = PRC_PARAMPROB;
486 break;
487 #endif
488 case ICMP6_DST_UNREACH_NOPORT:
489 code = PRC_UNREACH_PORT;
490 break;
491 default:
492 goto badcode;
493 }
494 goto deliver;
495 break;
496
497 case ICMP6_PACKET_TOO_BIG:
498 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
499 if (code != 0)
500 goto badcode;
501
502 code = PRC_MSGSIZE;
503
504 /*
505 * Updating the path MTU will be done after examining
506 * intermediate extension headers.
507 */
508 goto deliver;
509 break;
510
511 case ICMP6_TIME_EXCEEDED:
512 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
513 switch (code) {
514 case ICMP6_TIME_EXCEED_TRANSIT:
515 case ICMP6_TIME_EXCEED_REASSEMBLY:
516 code += PRC_TIMXCEED_INTRANS;
517 break;
518 default:
519 goto badcode;
520 }
521 goto deliver;
522 break;
523
524 case ICMP6_PARAM_PROB:
525 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
526 switch (code) {
527 case ICMP6_PARAMPROB_NEXTHEADER:
528 code = PRC_UNREACH_PROTOCOL;
529 break;
530 case ICMP6_PARAMPROB_HEADER:
531 case ICMP6_PARAMPROB_OPTION:
532 code = PRC_PARAMPROB;
533 break;
534 default:
535 goto badcode;
536 }
537 goto deliver;
538 break;
539
540 case ICMP6_ECHO_REQUEST:
541 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
542 if (code != 0)
543 goto badcode;
544 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
545 /* Give up remote */
546 break;
547 }
548 if ((n->m_flags & M_EXT) != 0
549 || n->m_len < off + sizeof(struct icmp6_hdr)) {
550 struct mbuf *n0 = n;
551 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
552
553 /*
554 * Prepare an internal mbuf. m_pullup() doesn't
555 * always copy the length we specified.
556 */
557 if (maxlen >= MCLBYTES) {
558 /* Give up remote */
559 m_freem(n0);
560 break;
561 }
562 MGETHDR(n, M_DONTWAIT, n0->m_type);
563 if (n && maxlen >= MHLEN) {
564 MCLGET(n, M_DONTWAIT);
565 if ((n->m_flags & M_EXT) == 0) {
566 m_free(n);
567 n = NULL;
568 }
569 }
570 if (n == NULL) {
571 /* Give up remote */
572 m_freem(n0);
573 break;
574 }
575 M_COPY_PKTHDR(n, n0);
576 /*
577 * Copy IPv6 and ICMPv6 only.
578 */
579 nip6 = mtod(n, struct ip6_hdr *);
580 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
581 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
582 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
583 noff = sizeof(struct ip6_hdr);
584 n->m_pkthdr.len = n->m_len =
585 noff + sizeof(struct icmp6_hdr);
586 /*
587 * Adjust mbuf. ip6_plen will be adjusted in
588 * ip6_output().
589 */
590 m_adj(n0, off + sizeof(struct icmp6_hdr));
591 n->m_pkthdr.len += n0->m_pkthdr.len;
592 n->m_next = n0;
593 n0->m_flags &= ~M_PKTHDR;
594 } else {
595 nip6 = mtod(n, struct ip6_hdr *);
596 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off);
597 noff = off;
598 }
599 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
600 nicmp6->icmp6_code = 0;
601 if (n) {
602 icmp6stat.icp6s_reflect++;
603 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
604 icmp6_reflect(n, noff);
605 }
606 break;
607
608 case ICMP6_ECHO_REPLY:
609 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
610 if (code != 0)
611 goto badcode;
612 break;
613
614 case MLD6_LISTENER_QUERY:
615 case MLD6_LISTENER_REPORT:
616 if (icmp6len < sizeof(struct mld6_hdr))
617 goto badlen;
618 if (icmp6->icmp6_type == MLD6_LISTENER_QUERY) /* XXX: ugly... */
619 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
620 else
621 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
622 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
623 /* give up local */
624 mld6_input(m, off);
625 m = NULL;
626 goto freeit;
627 }
628 mld6_input(n, off);
629 /* m stays. */
630 break;
631
632 case MLD6_LISTENER_DONE:
633 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
634 if (icmp6len < sizeof(struct mld6_hdr)) /* necessary? */
635 goto badlen;
636 break; /* nothing to be done in kernel */
637
638 case MLD6_MTRACE_RESP:
639 case MLD6_MTRACE:
640 /* XXX: these two are experimental. not officially defind. */
641 /* XXX: per-interface statistics? */
642 break; /* just pass it to applications */
643
644 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
645 {
646 enum { WRU, FQDN } mode;
647
648 if (!icmp6_nodeinfo)
649 break;
650
651 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
652 mode = WRU;
653 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
654 mode = FQDN;
655 else
656 goto badlen;
657
658 #define hostnamelen strlen(hostname)
659 if (mode == FQDN) {
660 #ifndef PULLDOWN_TEST
661 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
662 IPPROTO_DONE);
663 #endif
664 n = m_copy(m, 0, M_COPYALL);
665 if (n)
666 n = ni6_input(n, off);
667 /* XXX meaningless if n == NULL */
668 noff = sizeof(struct ip6_hdr);
669 } else {
670 u_char *p;
671 int maxlen, maxhlen;
672
673 if ((icmp6_nodeinfo & 5) != 5)
674 break;
675
676 if (code != 0)
677 goto badcode;
678 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
679 if (maxlen >= MCLBYTES) {
680 /* Give up remote */
681 break;
682 }
683 MGETHDR(n, M_DONTWAIT, m->m_type);
684 if (n && maxlen > MHLEN) {
685 MCLGET(n, M_DONTWAIT);
686 if ((n->m_flags & M_EXT) == 0) {
687 m_free(n);
688 n = NULL;
689 }
690 }
691 if (n == NULL) {
692 /* Give up remote */
693 break;
694 }
695 n->m_pkthdr.rcvif = NULL;
696 n->m_len = 0;
697 maxhlen = M_TRAILINGSPACE(n) - maxlen;
698 if (maxhlen > hostnamelen)
699 maxhlen = hostnamelen;
700 /*
701 * Copy IPv6 and ICMPv6 only.
702 */
703 nip6 = mtod(n, struct ip6_hdr *);
704 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
705 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
706 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
707 p = (u_char *)(nicmp6 + 1);
708 bzero(p, 4);
709 bcopy(hostname, p + 4, maxhlen); /*meaningless TTL*/
710 noff = sizeof(struct ip6_hdr);
711 M_COPY_PKTHDR(n, m); /* just for recvif */
712 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
713 sizeof(struct icmp6_hdr) + 4 + maxhlen;
714 nicmp6->icmp6_type = ICMP6_WRUREPLY;
715 nicmp6->icmp6_code = 0;
716 }
717 #undef hostnamelen
718 if (n) {
719 icmp6stat.icp6s_reflect++;
720 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
721 icmp6_reflect(n, noff);
722 }
723 break;
724 }
725
726 case ICMP6_WRUREPLY:
727 if (code != 0)
728 goto badcode;
729 break;
730
731 case ND_ROUTER_SOLICIT:
732 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
733 if (code != 0)
734 goto badcode;
735 if (icmp6len < sizeof(struct nd_router_solicit))
736 goto badlen;
737 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
738 /* give up local */
739 nd6_rs_input(m, off, icmp6len);
740 m = NULL;
741 goto freeit;
742 }
743 nd6_rs_input(n, off, icmp6len);
744 /* m stays. */
745 break;
746
747 case ND_ROUTER_ADVERT:
748 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
749 if (code != 0)
750 goto badcode;
751 if (icmp6len < sizeof(struct nd_router_advert))
752 goto badlen;
753 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
754 /* give up local */
755 nd6_ra_input(m, off, icmp6len);
756 m = NULL;
757 goto freeit;
758 }
759 nd6_ra_input(n, off, icmp6len);
760 /* m stays. */
761 break;
762
763 case ND_NEIGHBOR_SOLICIT:
764 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
765 if (code != 0)
766 goto badcode;
767 if (icmp6len < sizeof(struct nd_neighbor_solicit))
768 goto badlen;
769 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
770 /* give up local */
771 nd6_ns_input(m, off, icmp6len);
772 m = NULL;
773 goto freeit;
774 }
775 nd6_ns_input(n, off, icmp6len);
776 /* m stays. */
777 break;
778
779 case ND_NEIGHBOR_ADVERT:
780 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
781 if (code != 0)
782 goto badcode;
783 if (icmp6len < sizeof(struct nd_neighbor_advert))
784 goto badlen;
785 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
786 /* give up local */
787 nd6_na_input(m, off, icmp6len);
788 m = NULL;
789 goto freeit;
790 }
791 nd6_na_input(n, off, icmp6len);
792 /* m stays. */
793 break;
794
795 case ND_REDIRECT:
796 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
797 if (code != 0)
798 goto badcode;
799 if (icmp6len < sizeof(struct nd_redirect))
800 goto badlen;
801 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
802 /* give up local */
803 icmp6_redirect_input(m, off);
804 m = NULL;
805 goto freeit;
806 }
807 icmp6_redirect_input(n, off);
808 /* m stays. */
809 break;
810
811 case ICMP6_ROUTER_RENUMBERING:
812 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
813 code != ICMP6_ROUTER_RENUMBERING_RESULT)
814 goto badcode;
815 if (icmp6len < sizeof(struct icmp6_router_renum))
816 goto badlen;
817 break;
818
819 default:
820 nd6log((LOG_DEBUG,
821 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
822 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
823 ip6_sprintf(&ip6->ip6_dst),
824 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
825 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
826 /* ICMPv6 error: MUST deliver it by spec... */
827 code = PRC_NCMDS;
828 /* deliver */
829 } else {
830 /* ICMPv6 informational: MUST not deliver */
831 break;
832 }
833 deliver:
834 if (icmp6_notify_error(m, off, icmp6len, code)) {
835 /* In this case, m should've been freed. */
836 return(IPPROTO_DONE);
837 }
838 break;
839
840 badcode:
841 icmp6stat.icp6s_badcode++;
842 break;
843
844 badlen:
845 icmp6stat.icp6s_badlen++;
846 break;
847 }
848
849 /* deliver the packet to appropriate sockets */
850 icmp6_rip6_input(&m, *offp);
851
852 return IPPROTO_DONE;
853
854 freeit:
855 m_freem(m);
856 return IPPROTO_DONE;
857 }
858
859 static int
860 icmp6_notify_error(m, off, icmp6len, code)
861 struct mbuf *m;
862 int off, icmp6len;
863 {
864 struct icmp6_hdr *icmp6;
865 struct ip6_hdr *eip6;
866 u_int32_t notifymtu;
867 struct sockaddr_in6 icmp6src, icmp6dst;
868
869 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
870 icmp6stat.icp6s_tooshort++;
871 goto freeit;
872 }
873 #ifndef PULLDOWN_TEST
874 IP6_EXTHDR_CHECK(m, off,
875 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
876 -1);
877 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
878 #else
879 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
880 sizeof(*icmp6) + sizeof(struct ip6_hdr));
881 if (icmp6 == NULL) {
882 icmp6stat.icp6s_tooshort++;
883 return(-1);
884 }
885 #endif
886 eip6 = (struct ip6_hdr *)(icmp6 + 1);
887
888 /* Detect the upper level protocol */
889 {
890 void (*ctlfunc) __P((int, struct sockaddr *, void *));
891 u_int8_t nxt = eip6->ip6_nxt;
892 int eoff = off + sizeof(struct icmp6_hdr) +
893 sizeof(struct ip6_hdr);
894 struct ip6ctlparam ip6cp;
895 struct in6_addr *finaldst = NULL;
896 int icmp6type = icmp6->icmp6_type;
897 struct ip6_frag *fh;
898 struct ip6_rthdr *rth;
899 struct ip6_rthdr0 *rth0;
900 int rthlen;
901
902 while (1) { /* XXX: should avoid inf. loop explicitly? */
903 struct ip6_ext *eh;
904
905 switch (nxt) {
906 case IPPROTO_HOPOPTS:
907 case IPPROTO_DSTOPTS:
908 case IPPROTO_AH:
909 #ifndef PULLDOWN_TEST
910 IP6_EXTHDR_CHECK(m, 0, eoff +
911 sizeof(struct ip6_ext),
912 -1);
913 eh = (struct ip6_ext *)(mtod(m, caddr_t)
914 + eoff);
915 #else
916 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
917 eoff, sizeof(*eh));
918 if (eh == NULL) {
919 icmp6stat.icp6s_tooshort++;
920 return(-1);
921 }
922 #endif
923
924 if (nxt == IPPROTO_AH)
925 eoff += (eh->ip6e_len + 2) << 2;
926 else
927 eoff += (eh->ip6e_len + 1) << 3;
928 nxt = eh->ip6e_nxt;
929 break;
930 case IPPROTO_ROUTING:
931 /*
932 * When the erroneous packet contains a
933 * routing header, we should examine the
934 * header to determine the final destination.
935 * Otherwise, we can't properly update
936 * information that depends on the final
937 * destination (e.g. path MTU).
938 */
939 #ifndef PULLDOWN_TEST
940 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
941 -1);
942 rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
943 + eoff);
944 #else
945 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
946 eoff, sizeof(*rth));
947 if (rth == NULL) {
948 icmp6stat.icp6s_tooshort++;
949 return(-1);
950 }
951 #endif
952 rthlen = (rth->ip6r_len + 1) << 3;
953 /*
954 * XXX: currently there is no
955 * officially defined type other
956 * than type-0.
957 * Note that if the segment left field
958 * is 0, all intermediate hops must
959 * have been passed.
960 */
961 if (rth->ip6r_segleft &&
962 rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
963 int hops;
964
965 #ifndef PULLDOWN_TEST
966 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen,
967 -1);
968 rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff);
969 #else
970 IP6_EXTHDR_GET(rth0,
971 struct ip6_rthdr0 *, m,
972 eoff, rthlen);
973 if (rth0 == NULL) {
974 icmp6stat.icp6s_tooshort++;
975 return(-1);
976 }
977 #endif
978 /* just ignore a bogus header */
979 if ((rth0->ip6r0_len % 2) == 0 &&
980 (hops = rth0->ip6r0_len/2))
981 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
982 }
983 eoff += rthlen;
984 nxt = rth->ip6r_nxt;
985 break;
986 case IPPROTO_FRAGMENT:
987 #ifndef PULLDOWN_TEST
988 IP6_EXTHDR_CHECK(m, 0, eoff +
989 sizeof(struct ip6_frag),
990 -1);
991 fh = (struct ip6_frag *)(mtod(m, caddr_t)
992 + eoff);
993 #else
994 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
995 eoff, sizeof(*fh));
996 if (fh == NULL) {
997 icmp6stat.icp6s_tooshort++;
998 return(-1);
999 }
1000 #endif
1001 /*
1002 * Data after a fragment header is meaningless
1003 * unless it is the first fragment, but
1004 * we'll go to the notify label for path MTU
1005 * discovery.
1006 */
1007 if (fh->ip6f_offlg & IP6F_OFF_MASK)
1008 goto notify;
1009
1010 eoff += sizeof(struct ip6_frag);
1011 nxt = fh->ip6f_nxt;
1012 break;
1013 default:
1014 /*
1015 * This case includes ESP and the No Next
1016 * Header. In such cases going to the notify
1017 * label does not have any meaning
1018 * (i.e. ctlfunc will be NULL), but we go
1019 * anyway since we might have to update
1020 * path MTU information.
1021 */
1022 goto notify;
1023 }
1024 }
1025 notify:
1026 #ifndef PULLDOWN_TEST
1027 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1028 #else
1029 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1030 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1031 if (icmp6 == NULL) {
1032 icmp6stat.icp6s_tooshort++;
1033 return(-1);
1034 }
1035 #endif
1036
1037 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1038 bzero(&icmp6dst, sizeof(icmp6dst));
1039 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1040 icmp6dst.sin6_family = AF_INET6;
1041 if (finaldst == NULL)
1042 icmp6dst.sin6_addr = eip6->ip6_dst;
1043 else
1044 icmp6dst.sin6_addr = *finaldst;
1045 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1046 &icmp6dst.sin6_addr);
1047 #ifndef SCOPEDROUTING
1048 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst,
1049 NULL, NULL)) {
1050 /* should be impossbile */
1051 nd6log((LOG_DEBUG,
1052 "icmp6_notify_error: in6_embedscope failed\n"));
1053 goto freeit;
1054 }
1055 #endif
1056
1057 /*
1058 * retrieve parameters from the inner IPv6 header, and convert
1059 * them into sockaddr structures.
1060 */
1061 bzero(&icmp6src, sizeof(icmp6src));
1062 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1063 icmp6src.sin6_family = AF_INET6;
1064 icmp6src.sin6_addr = eip6->ip6_src;
1065 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1066 &icmp6src.sin6_addr);
1067 #ifndef SCOPEDROUTING
1068 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src,
1069 NULL, NULL)) {
1070 /* should be impossbile */
1071 nd6log((LOG_DEBUG,
1072 "icmp6_notify_error: in6_embedscope failed\n"));
1073 goto freeit;
1074 }
1075 #endif
1076 icmp6src.sin6_flowinfo =
1077 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1078
1079 if (finaldst == NULL)
1080 finaldst = &eip6->ip6_dst;
1081 ip6cp.ip6c_m = m;
1082 ip6cp.ip6c_icmp6 = icmp6;
1083 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1084 ip6cp.ip6c_off = eoff;
1085 ip6cp.ip6c_finaldst = finaldst;
1086 ip6cp.ip6c_src = &icmp6src;
1087 ip6cp.ip6c_nxt = nxt;
1088
1089 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1090 notifymtu = ntohl(icmp6->icmp6_mtu);
1091 ip6cp.ip6c_cmdarg = (void *)&notifymtu;
1092 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1093 }
1094
1095 ctlfunc = (void (*) __P((int, struct sockaddr *, void *)))
1096 (ip6_protox[nxt]->pr_ctlinput);
1097 if (ctlfunc) {
1098 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
1099 &ip6cp);
1100 }
1101 }
1102 return(0);
1103
1104 freeit:
1105 m_freem(m);
1106 return(-1);
1107 }
1108
1109 void
1110 icmp6_mtudisc_update(ip6cp, validated)
1111 struct ip6ctlparam *ip6cp;
1112 int validated;
1113 {
1114 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1115 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1116 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1117 u_int mtu = ntohl(icmp6->icmp6_mtu);
1118 struct rtentry *rt = NULL;
1119 struct sockaddr_in6 sin6;
1120
1121 if (!validated)
1122 return;
1123
1124 bzero(&sin6, sizeof(sin6));
1125 sin6.sin6_family = PF_INET6;
1126 sin6.sin6_len = sizeof(struct sockaddr_in6);
1127 sin6.sin6_addr = *dst;
1128 /* XXX normally, this won't happen */
1129 if (IN6_IS_ADDR_LINKLOCAL(dst)) {
1130 sin6.sin6_addr.s6_addr16[1] =
1131 htons(m->m_pkthdr.rcvif->if_index);
1132 }
1133 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
1134 rt = rtalloc1((struct sockaddr *)&sin6, 0,
1135 RTF_CLONING | RTF_PRCLONING);
1136
1137 if (rt && (rt->rt_flags & RTF_HOST)
1138 && !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
1139 if (mtu < IPV6_MMTU) {
1140 /* xxx */
1141 rt->rt_rmx.rmx_locks |= RTV_MTU;
1142 } else if (mtu < rt->rt_ifp->if_mtu &&
1143 rt->rt_rmx.rmx_mtu > mtu) {
1144 icmp6stat.icp6s_pmtuchg++;
1145 rt->rt_rmx.rmx_mtu = mtu;
1146 }
1147 }
1148 if (rt)
1149 rtfree(rt);
1150 }
1151
1152 /*
1153 * Process a Node Information Query packet, based on
1154 * draft-ietf-ipngwg-icmp-name-lookups-07.
1155 *
1156 * Spec incompatibilities:
1157 * - IPv6 Subject address handling
1158 * - IPv4 Subject address handling support missing
1159 * - Proxy reply (answer even if it's not for me)
1160 * - joins NI group address at in6_ifattach() time only, does not cope
1161 * with hostname changes by sethostname(3)
1162 */
1163 #define hostnamelen strlen(hostname)
1164 static struct mbuf *
1165 ni6_input(m, off)
1166 struct mbuf *m;
1167 int off;
1168 {
1169 struct icmp6_nodeinfo *ni6, *nni6;
1170 struct mbuf *n = NULL;
1171 u_int16_t qtype;
1172 int subjlen;
1173 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1174 struct ni_reply_fqdn *fqdn;
1175 int addrs; /* for NI_QTYPE_NODEADDR */
1176 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1177 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
1178 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
1179 struct ip6_hdr *ip6;
1180 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1181 char *subj = NULL;
1182 struct in6_ifaddr *ia6 = NULL;
1183
1184 ip6 = mtod(m, struct ip6_hdr *);
1185 #ifndef PULLDOWN_TEST
1186 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1187 #else
1188 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1189 if (ni6 == NULL) {
1190 /* m is already reclaimed */
1191 return NULL;
1192 }
1193 #endif
1194
1195 /*
1196 * Validate IPv6 destination address.
1197 *
1198 * The Responder must discard the Query without further processing
1199 * unless it is one of the Responder's unicast or anycast addresses, or
1200 * a link-local scope multicast address which the Responder has joined.
1201 * [icmp-name-lookups-07, Section 4.]
1202 */
1203 bzero(&sin6, sizeof(sin6));
1204 sin6.sin6_family = AF_INET6;
1205 sin6.sin6_len = sizeof(struct sockaddr_in6);
1206 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
1207 /* XXX scopeid */
1208 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) {
1209 /* unicast/anycast, fine */
1210 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1211 (icmp6_nodeinfo & 4) == 0) {
1212 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1213 "a temporary address in %s:%d",
1214 __FILE__, __LINE__));
1215 goto bad;
1216 }
1217 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr))
1218 ; /* link-local multicast, fine */
1219 else
1220 goto bad;
1221
1222 /* validate query Subject field. */
1223 qtype = ntohs(ni6->ni_qtype);
1224 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1225 switch (qtype) {
1226 case NI_QTYPE_NOOP:
1227 case NI_QTYPE_SUPTYPES:
1228 /* 07 draft */
1229 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1230 break;
1231 /* FALLTHROUGH */
1232 case NI_QTYPE_FQDN:
1233 case NI_QTYPE_NODEADDR:
1234 switch (ni6->ni_code) {
1235 case ICMP6_NI_SUBJ_IPV6:
1236 #if ICMP6_NI_SUBJ_IPV6 != 0
1237 case 0:
1238 #endif
1239 /*
1240 * backward compatibility - try to accept 03 draft
1241 * format, where no Subject is present.
1242 */
1243 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1244 subjlen == 0) {
1245 oldfqdn++;
1246 break;
1247 }
1248 #if ICMP6_NI_SUBJ_IPV6 != 0
1249 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1250 goto bad;
1251 #endif
1252
1253 if (subjlen != sizeof(sin6.sin6_addr))
1254 goto bad;
1255
1256 /*
1257 * Validate Subject address.
1258 *
1259 * Not sure what exactly "address belongs to the node"
1260 * means in the spec, is it just unicast, or what?
1261 *
1262 * At this moment we consider Subject address as
1263 * "belong to the node" if the Subject address equals
1264 * to the IPv6 destination address; validation for
1265 * IPv6 destination address should have done enough
1266 * check for us.
1267 *
1268 * We do not do proxy at this moment.
1269 */
1270 /* m_pulldown instead of copy? */
1271 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1272 subjlen, (caddr_t)&sin6.sin6_addr);
1273 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1274 &sin6.sin6_addr);
1275 #ifndef SCOPEDROUTING
1276 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL);
1277 #endif
1278 bzero(&sin6_d, sizeof(sin6_d));
1279 sin6_d.sin6_family = AF_INET6; /* not used, actually */
1280 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */
1281 sin6_d.sin6_addr = ip6->ip6_dst;
1282 sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1283 &ip6->ip6_dst);
1284 #ifndef SCOPEDROUTING
1285 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL);
1286 #endif
1287 subj = (char *)&sin6;
1288 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
1289 break;
1290
1291 /*
1292 * XXX if we are to allow other cases, we should really
1293 * be careful about scope here.
1294 * basically, we should disallow queries toward IPv6
1295 * destination X with subject Y, if scope(X) > scope(Y).
1296 * if we allow scope(X) > scope(Y), it will result in
1297 * information leakage across scope boundary.
1298 */
1299 goto bad;
1300
1301 case ICMP6_NI_SUBJ_FQDN:
1302 /*
1303 * Validate Subject name with gethostname(3).
1304 *
1305 * The behavior may need some debate, since:
1306 * - we are not sure if the node has FQDN as
1307 * hostname (returned by gethostname(3)).
1308 * - the code does wildcard match for truncated names.
1309 * however, we are not sure if we want to perform
1310 * wildcard match, if gethostname(3) side has
1311 * truncated hostname.
1312 */
1313 n = ni6_nametodns(hostname, hostnamelen, 0);
1314 if (!n || n->m_next || n->m_len == 0)
1315 goto bad;
1316 IP6_EXTHDR_GET(subj, char *, m,
1317 off + sizeof(struct icmp6_nodeinfo), subjlen);
1318 if (subj == NULL)
1319 goto bad;
1320 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1321 n->m_len)) {
1322 goto bad;
1323 }
1324 m_freem(n);
1325 n = NULL;
1326 break;
1327
1328 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1329 default:
1330 goto bad;
1331 }
1332 break;
1333 }
1334
1335 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1336 switch (qtype) {
1337 case NI_QTYPE_FQDN:
1338 if ((icmp6_nodeinfo & 1) == 0)
1339 goto bad;
1340 break;
1341 case NI_QTYPE_NODEADDR:
1342 if ((icmp6_nodeinfo & 2) == 0)
1343 goto bad;
1344 break;
1345 }
1346
1347 /* guess reply length */
1348 switch (qtype) {
1349 case NI_QTYPE_NOOP:
1350 break; /* no reply data */
1351 case NI_QTYPE_SUPTYPES:
1352 replylen += sizeof(u_int32_t);
1353 break;
1354 case NI_QTYPE_FQDN:
1355 /* XXX will append an mbuf */
1356 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1357 break;
1358 case NI_QTYPE_NODEADDR:
1359 addrs = ni6_addrs(ni6, m, &ifp, subj);
1360 if ((replylen += addrs * (sizeof(struct in6_addr) +
1361 sizeof(u_int32_t))) > MCLBYTES)
1362 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1363 break;
1364 default:
1365 /*
1366 * XXX: We must return a reply with the ICMP6 code
1367 * `unknown Qtype' in this case. However we regard the case
1368 * as an FQDN query for backward compatibility.
1369 * Older versions set a random value to this field,
1370 * so it rarely varies in the defined qtypes.
1371 * But the mechanism is not reliable...
1372 * maybe we should obsolete older versions.
1373 */
1374 qtype = NI_QTYPE_FQDN;
1375 /* XXX will append an mbuf */
1376 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1377 oldfqdn++;
1378 break;
1379 }
1380
1381 /* allocate an mbuf to reply. */
1382 MGETHDR(n, M_DONTWAIT, m->m_type);
1383 if (n == NULL) {
1384 m_freem(m);
1385 return(NULL);
1386 }
1387 M_COPY_PKTHDR(n, m); /* just for recvif */
1388 if (replylen > MHLEN) {
1389 if (replylen > MCLBYTES) {
1390 /*
1391 * XXX: should we try to allocate more? But MCLBYTES
1392 * is probably much larger than IPV6_MMTU...
1393 */
1394 goto bad;
1395 }
1396 MCLGET(n, M_DONTWAIT);
1397 if ((n->m_flags & M_EXT) == 0) {
1398 goto bad;
1399 }
1400 }
1401 n->m_pkthdr.len = n->m_len = replylen;
1402
1403 /* copy mbuf header and IPv6 + Node Information base headers */
1404 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1405 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1406 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1407
1408 /* qtype dependent procedure */
1409 switch (qtype) {
1410 case NI_QTYPE_NOOP:
1411 nni6->ni_code = ICMP6_NI_SUCCESS;
1412 nni6->ni_flags = 0;
1413 break;
1414 case NI_QTYPE_SUPTYPES:
1415 {
1416 u_int32_t v;
1417 nni6->ni_code = ICMP6_NI_SUCCESS;
1418 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1419 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1420 v = (u_int32_t)htonl(0x0000000f);
1421 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1422 break;
1423 }
1424 case NI_QTYPE_FQDN:
1425 nni6->ni_code = ICMP6_NI_SUCCESS;
1426 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1427 sizeof(struct ip6_hdr) +
1428 sizeof(struct icmp6_nodeinfo));
1429 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1430 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1431 /*
1432 * XXX do we really have FQDN in variable "hostname"?
1433 */
1434 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1435 if (n->m_next == NULL)
1436 goto bad;
1437 /* XXX we assume that n->m_next is not a chain */
1438 if (n->m_next->m_next != NULL)
1439 goto bad;
1440 n->m_pkthdr.len += n->m_next->m_len;
1441 break;
1442 case NI_QTYPE_NODEADDR:
1443 {
1444 int lenlim, copied;
1445
1446 nni6->ni_code = ICMP6_NI_SUCCESS;
1447 n->m_pkthdr.len = n->m_len =
1448 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1449 lenlim = M_TRAILINGSPACE(n);
1450 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1451 /* XXX: reset mbuf length */
1452 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1453 sizeof(struct icmp6_nodeinfo) + copied;
1454 break;
1455 }
1456 default:
1457 break; /* XXX impossible! */
1458 }
1459
1460 nni6->ni_type = ICMP6_NI_REPLY;
1461 m_freem(m);
1462 return(n);
1463
1464 bad:
1465 m_freem(m);
1466 if (n)
1467 m_freem(n);
1468 return(NULL);
1469 }
1470 #undef hostnamelen
1471
1472 /*
1473 * make a mbuf with DNS-encoded string. no compression support.
1474 *
1475 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1476 * treated as truncated name (two \0 at the end). this is a wild guess.
1477 */
1478 static struct mbuf *
1479 ni6_nametodns(name, namelen, old)
1480 const char *name;
1481 int namelen;
1482 int old; /* return pascal string if non-zero */
1483 {
1484 struct mbuf *m;
1485 char *cp, *ep;
1486 const char *p, *q;
1487 int i, len, nterm;
1488
1489 if (old)
1490 len = namelen + 1;
1491 else
1492 len = MCLBYTES;
1493
1494 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1495 MGET(m, M_DONTWAIT, MT_DATA);
1496 if (m && len > MLEN) {
1497 MCLGET(m, M_DONTWAIT);
1498 if ((m->m_flags & M_EXT) == 0)
1499 goto fail;
1500 }
1501 if (!m)
1502 goto fail;
1503 m->m_next = NULL;
1504
1505 if (old) {
1506 m->m_len = len;
1507 *mtod(m, char *) = namelen;
1508 bcopy(name, mtod(m, char *) + 1, namelen);
1509 return m;
1510 } else {
1511 m->m_len = 0;
1512 cp = mtod(m, char *);
1513 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1514
1515 /* if not certain about my name, return empty buffer */
1516 if (namelen == 0)
1517 return m;
1518
1519 /*
1520 * guess if it looks like shortened hostname, or FQDN.
1521 * shortened hostname needs two trailing "\0".
1522 */
1523 i = 0;
1524 for (p = name; p < name + namelen; p++) {
1525 if (*p && *p == '.')
1526 i++;
1527 }
1528 if (i < 2)
1529 nterm = 2;
1530 else
1531 nterm = 1;
1532
1533 p = name;
1534 while (cp < ep && p < name + namelen) {
1535 i = 0;
1536 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1537 i++;
1538 /* result does not fit into mbuf */
1539 if (cp + i + 1 >= ep)
1540 goto fail;
1541 /*
1542 * DNS label length restriction, RFC1035 page 8.
1543 * "i == 0" case is included here to avoid returning
1544 * 0-length label on "foo..bar".
1545 */
1546 if (i <= 0 || i >= 64)
1547 goto fail;
1548 *cp++ = i;
1549 bcopy(p, cp, i);
1550 cp += i;
1551 p = q;
1552 if (p < name + namelen && *p == '.')
1553 p++;
1554 }
1555 /* termination */
1556 if (cp + nterm >= ep)
1557 goto fail;
1558 while (nterm-- > 0)
1559 *cp++ = '\0';
1560 m->m_len = cp - mtod(m, char *);
1561 return m;
1562 }
1563
1564 panic("should not reach here");
1565 /*NOTREACHED*/
1566
1567 fail:
1568 if (m)
1569 m_freem(m);
1570 return NULL;
1571 }
1572
1573 /*
1574 * check if two DNS-encoded string matches. takes care of truncated
1575 * form (with \0\0 at the end). no compression support.
1576 * XXX upper/lowercase match (see RFC2065)
1577 */
1578 static int
1579 ni6_dnsmatch(a, alen, b, blen)
1580 const char *a;
1581 int alen;
1582 const char *b;
1583 int blen;
1584 {
1585 const char *a0, *b0;
1586 int l;
1587
1588 /* simplest case - need validation? */
1589 if (alen == blen && bcmp(a, b, alen) == 0)
1590 return 1;
1591
1592 a0 = a;
1593 b0 = b;
1594
1595 /* termination is mandatory */
1596 if (alen < 2 || blen < 2)
1597 return 0;
1598 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1599 return 0;
1600 alen--;
1601 blen--;
1602
1603 while (a - a0 < alen && b - b0 < blen) {
1604 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1605 return 0;
1606
1607 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1608 return 0;
1609 /* we don't support compression yet */
1610 if (a[0] >= 64 || b[0] >= 64)
1611 return 0;
1612
1613 /* truncated case */
1614 if (a[0] == 0 && a - a0 == alen - 1)
1615 return 1;
1616 if (b[0] == 0 && b - b0 == blen - 1)
1617 return 1;
1618 if (a[0] == 0 || b[0] == 0)
1619 return 0;
1620
1621 if (a[0] != b[0])
1622 return 0;
1623 l = a[0];
1624 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1625 return 0;
1626 if (bcmp(a + 1, b + 1, l) != 0)
1627 return 0;
1628
1629 a += 1 + l;
1630 b += 1 + l;
1631 }
1632
1633 if (a - a0 == alen && b - b0 == blen)
1634 return 1;
1635 else
1636 return 0;
1637 }
1638
1639 /*
1640 * calculate the number of addresses to be returned in the node info reply.
1641 */
1642 static int
1643 ni6_addrs(ni6, m, ifpp, subj)
1644 struct icmp6_nodeinfo *ni6;
1645 struct mbuf *m;
1646 struct ifnet **ifpp;
1647 char *subj;
1648 {
1649 struct ifnet *ifp;
1650 struct in6_ifaddr *ifa6;
1651 struct ifaddr *ifa;
1652 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
1653 int addrs = 0, addrsofif, iffound = 0;
1654 int niflags = ni6->ni_flags;
1655
1656 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1657 switch (ni6->ni_code) {
1658 case ICMP6_NI_SUBJ_IPV6:
1659 if (subj == NULL) /* must be impossible... */
1660 return(0);
1661 subj_ip6 = (struct sockaddr_in6 *)subj;
1662 break;
1663 default:
1664 /*
1665 * XXX: we only support IPv6 subject address for
1666 * this Qtype.
1667 */
1668 return(0);
1669 }
1670 }
1671
1672 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
1673 {
1674 addrsofif = 0;
1675 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1676 {
1677 if (ifa->ifa_addr->sa_family != AF_INET6)
1678 continue;
1679 ifa6 = (struct in6_ifaddr *)ifa;
1680
1681 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1682 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
1683 &ifa6->ia_addr.sin6_addr))
1684 iffound = 1;
1685
1686 /*
1687 * IPv4-mapped addresses can only be returned by a
1688 * Node Information proxy, since they represent
1689 * addresses of IPv4-only nodes, which perforce do
1690 * not implement this protocol.
1691 * [icmp-name-lookups-07, Section 5.4]
1692 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1693 * this function at this moment.
1694 */
1695
1696 /* What do we have to do about ::1? */
1697 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1698 case IPV6_ADDR_SCOPE_LINKLOCAL:
1699 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1700 continue;
1701 break;
1702 case IPV6_ADDR_SCOPE_SITELOCAL:
1703 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1704 continue;
1705 break;
1706 case IPV6_ADDR_SCOPE_GLOBAL:
1707 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1708 continue;
1709 break;
1710 default:
1711 continue;
1712 }
1713
1714 /*
1715 * check if anycast is okay.
1716 * XXX: just experimental. not in the spec.
1717 */
1718 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1719 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1720 continue; /* we need only unicast addresses */
1721 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1722 (icmp6_nodeinfo & 4) == 0) {
1723 continue;
1724 }
1725 addrsofif++; /* count the address */
1726 }
1727 if (iffound) {
1728 *ifpp = ifp;
1729 return(addrsofif);
1730 }
1731
1732 addrs += addrsofif;
1733 }
1734
1735 return(addrs);
1736 }
1737
1738 static int
1739 ni6_store_addrs(ni6, nni6, ifp0, resid)
1740 struct icmp6_nodeinfo *ni6, *nni6;
1741 struct ifnet *ifp0;
1742 int resid;
1743 {
1744 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet);
1745 struct in6_ifaddr *ifa6;
1746 struct ifaddr *ifa;
1747 struct ifnet *ifp_dep = NULL;
1748 int copied = 0, allow_deprecated = 0;
1749 u_char *cp = (u_char *)(nni6 + 1);
1750 int niflags = ni6->ni_flags;
1751 u_int32_t ltime;
1752
1753 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1754 return(0); /* needless to copy */
1755
1756 again:
1757
1758 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list))
1759 {
1760 for (ifa = ifp->if_addrlist.tqh_first; ifa;
1761 ifa = ifa->ifa_list.tqe_next)
1762 {
1763 if (ifa->ifa_addr->sa_family != AF_INET6)
1764 continue;
1765 ifa6 = (struct in6_ifaddr *)ifa;
1766
1767 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
1768 allow_deprecated == 0) {
1769 /*
1770 * prefererred address should be put before
1771 * deprecated addresses.
1772 */
1773
1774 /* record the interface for later search */
1775 if (ifp_dep == NULL)
1776 ifp_dep = ifp;
1777
1778 continue;
1779 }
1780 else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
1781 allow_deprecated != 0)
1782 continue; /* we now collect deprecated addrs */
1783
1784 /* What do we have to do about ::1? */
1785 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1786 case IPV6_ADDR_SCOPE_LINKLOCAL:
1787 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1788 continue;
1789 break;
1790 case IPV6_ADDR_SCOPE_SITELOCAL:
1791 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1792 continue;
1793 break;
1794 case IPV6_ADDR_SCOPE_GLOBAL:
1795 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1796 continue;
1797 break;
1798 default:
1799 continue;
1800 }
1801
1802 /*
1803 * check if anycast is okay.
1804 * XXX: just experimental. not in the spec.
1805 */
1806 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1807 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1808 continue;
1809 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1810 (icmp6_nodeinfo & 4) == 0) {
1811 continue;
1812 }
1813
1814 /* now we can copy the address */
1815 if (resid < sizeof(struct in6_addr) +
1816 sizeof(u_int32_t)) {
1817 /*
1818 * We give up much more copy.
1819 * Set the truncate flag and return.
1820 */
1821 nni6->ni_flags |=
1822 NI_NODEADDR_FLAG_TRUNCATE;
1823 return(copied);
1824 }
1825
1826 /*
1827 * Set the TTL of the address.
1828 * The TTL value should be one of the following
1829 * according to the specification:
1830 *
1831 * 1. The remaining lifetime of a DHCP lease on the
1832 * address, or
1833 * 2. The remaining Valid Lifetime of a prefix from
1834 * which the address was derived through Stateless
1835 * Autoconfiguration.
1836 *
1837 * Note that we currently do not support stateful
1838 * address configuration by DHCPv6, so the former
1839 * case can't happen.
1840 */
1841 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1842 ltime = ND6_INFINITE_LIFETIME;
1843 else {
1844 if (ifa6->ia6_lifetime.ia6t_expire >
1845 time_second)
1846 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second);
1847 else
1848 ltime = 0;
1849 }
1850
1851 bcopy(&ltime, cp, sizeof(u_int32_t));
1852 cp += sizeof(u_int32_t);
1853
1854 /* copy the address itself */
1855 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1856 sizeof(struct in6_addr));
1857 /* XXX: KAME link-local hack; remove ifindex */
1858 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr))
1859 ((struct in6_addr *)cp)->s6_addr16[1] = 0;
1860 cp += sizeof(struct in6_addr);
1861
1862 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1863 copied += (sizeof(struct in6_addr) +
1864 sizeof(u_int32_t));
1865 }
1866 if (ifp0) /* we need search only on the specified IF */
1867 break;
1868 }
1869
1870 if (allow_deprecated == 0 && ifp_dep != NULL) {
1871 ifp = ifp_dep;
1872 allow_deprecated = 1;
1873
1874 goto again;
1875 }
1876
1877 return(copied);
1878 }
1879
1880 /*
1881 * XXX almost dup'ed code with rip6_input.
1882 */
1883 static int
1884 icmp6_rip6_input(mp, off)
1885 struct mbuf **mp;
1886 int off;
1887 {
1888 struct mbuf *m = *mp;
1889 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1890 struct in6pcb *in6p;
1891 struct in6pcb *last = NULL;
1892 struct sockaddr_in6 rip6src;
1893 struct icmp6_hdr *icmp6;
1894 struct mbuf *opts = NULL;
1895
1896 #ifndef PULLDOWN_TEST
1897 /* this is assumed to be safe. */
1898 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1899 #else
1900 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1901 if (icmp6 == NULL) {
1902 /* m is already reclaimed */
1903 return IPPROTO_DONE;
1904 }
1905 #endif
1906
1907 bzero(&rip6src, sizeof(rip6src));
1908 rip6src.sin6_len = sizeof(struct sockaddr_in6);
1909 rip6src.sin6_family = AF_INET6;
1910 /* KAME hack: recover scopeid */
1911 (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1912
1913 LIST_FOREACH(in6p, &ripcb, inp_list)
1914 {
1915 if ((in6p->inp_vflag & INP_IPV6) == 0)
1916 continue;
1917 #if HAVE_NRL_INPCB
1918 if (!(in6p->in6p_flags & INP_IPV6))
1919 continue;
1920 #endif
1921 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
1922 continue;
1923 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1924 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1925 continue;
1926 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1927 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1928 continue;
1929 if (in6p->in6p_icmp6filt
1930 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1931 in6p->in6p_icmp6filt))
1932 continue;
1933 if (last) {
1934 struct mbuf *n;
1935 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1936 if (last->in6p_flags & IN6P_CONTROLOPTS)
1937 ip6_savecontrol(last, &opts, ip6, n);
1938 /* strip intermediate headers */
1939 m_adj(n, off);
1940 if (sbappendaddr(&last->in6p_socket->so_rcv,
1941 (struct sockaddr *)&rip6src,
1942 n, opts) == 0) {
1943 /* should notify about lost packet */
1944 m_freem(n);
1945 if (opts) {
1946 m_freem(opts);
1947 }
1948 } else
1949 sorwakeup(last->in6p_socket);
1950 opts = NULL;
1951 }
1952 }
1953 last = in6p;
1954 }
1955 if (last) {
1956 if (last->in6p_flags & IN6P_CONTROLOPTS)
1957 ip6_savecontrol(last, &opts, ip6, m);
1958 /* strip intermediate headers */
1959 m_adj(m, off);
1960 if (sbappendaddr(&last->in6p_socket->so_rcv,
1961 (struct sockaddr *)&rip6src, m, opts) == 0) {
1962 m_freem(m);
1963 if (opts)
1964 m_freem(opts);
1965 } else
1966 sorwakeup(last->in6p_socket);
1967 } else {
1968 m_freem(m);
1969 ip6stat.ip6s_delivered--;
1970 }
1971 return IPPROTO_DONE;
1972 }
1973
1974 /*
1975 * Reflect the ip6 packet back to the source.
1976 * OFF points to the icmp6 header, counted from the top of the mbuf.
1977 */
1978 void
1979 icmp6_reflect(m, off)
1980 struct mbuf *m;
1981 size_t off;
1982 {
1983 struct ip6_hdr *ip6;
1984 struct icmp6_hdr *icmp6;
1985 struct in6_ifaddr *ia;
1986 struct in6_addr t, *src = 0;
1987 int plen;
1988 int type, code;
1989 struct ifnet *outif = NULL;
1990 struct sockaddr_in6 sa6_src, sa6_dst;
1991 #ifdef COMPAT_RFC1885
1992 int mtu = IPV6_MMTU;
1993 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst;
1994 #endif
1995
1996 /* too short to reflect */
1997 if (off < sizeof(struct ip6_hdr)) {
1998 nd6log((LOG_DEBUG,
1999 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2000 (u_long)off, (u_long)sizeof(struct ip6_hdr),
2001 __FILE__, __LINE__));
2002 goto bad;
2003 }
2004
2005 /*
2006 * If there are extra headers between IPv6 and ICMPv6, strip
2007 * off that header first.
2008 */
2009 #if DIAGNOSTIC
2010 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
2011 panic("assumption failed in icmp6_reflect");
2012 #endif
2013 if (off > sizeof(struct ip6_hdr)) {
2014 size_t l;
2015 struct ip6_hdr nip6;
2016
2017 l = off - sizeof(struct ip6_hdr);
2018 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2019 m_adj(m, l);
2020 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2021 if (m->m_len < l) {
2022 if ((m = m_pullup(m, l)) == NULL)
2023 return;
2024 }
2025 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2026 } else /* off == sizeof(struct ip6_hdr) */ {
2027 size_t l;
2028 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2029 if (m->m_len < l) {
2030 if ((m = m_pullup(m, l)) == NULL)
2031 return;
2032 }
2033 }
2034 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
2035 ip6 = mtod(m, struct ip6_hdr *);
2036 ip6->ip6_nxt = IPPROTO_ICMPV6;
2037 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
2038 type = icmp6->icmp6_type; /* keep type for statistics */
2039 code = icmp6->icmp6_code; /* ditto. */
2040
2041 t = ip6->ip6_dst;
2042 /*
2043 * ip6_input() drops a packet if its src is multicast.
2044 * So, the src is never multicast.
2045 */
2046 ip6->ip6_dst = ip6->ip6_src;
2047
2048 /*
2049 * XXX: make sure to embed scope zone information, using
2050 * already embedded IDs or the received interface (if any).
2051 * Note that rcvif may be NULL.
2052 * TODO: scoped routing case (XXX).
2053 */
2054 bzero(&sa6_src, sizeof(sa6_src));
2055 sa6_src.sin6_family = AF_INET6;
2056 sa6_src.sin6_len = sizeof(sa6_src);
2057 sa6_src.sin6_addr = ip6->ip6_dst;
2058 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
2059 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL);
2060 bzero(&sa6_dst, sizeof(sa6_dst));
2061 sa6_dst.sin6_family = AF_INET6;
2062 sa6_dst.sin6_len = sizeof(sa6_dst);
2063 sa6_dst.sin6_addr = t;
2064 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
2065 in6_embedscope(&t, &sa6_dst, NULL, NULL);
2066
2067 #ifdef COMPAT_RFC1885
2068 /*
2069 * xxx guess MTU
2070 * RFC 1885 requires that echo reply should be truncated if it
2071 * does not fit in with (return) path MTU, but the description was
2072 * removed in the new spec.
2073 */
2074 if (icmp6_reflect_rt.ro_rt == 0 ||
2075 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) {
2076 if (icmp6_reflect_rt.ro_rt) {
2077 rtfree(icmp6_reflect_rt.ro_rt);
2078 icmp6_reflect_rt.ro_rt = 0;
2079 }
2080 bzero(sin6, sizeof(*sin6));
2081 sin6->sin6_family = PF_INET6;
2082 sin6->sin6_len = sizeof(struct sockaddr_in6);
2083 sin6->sin6_addr = ip6->ip6_dst;
2084
2085 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt,
2086 RTF_PRCLONING);
2087 }
2088
2089 if (icmp6_reflect_rt.ro_rt == 0)
2090 goto bad;
2091
2092 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST)
2093 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu)
2094 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu;
2095
2096 if (mtu < m->m_pkthdr.len) {
2097 plen -= (m->m_pkthdr.len - mtu);
2098 m_adj(m, mtu - m->m_pkthdr.len);
2099 }
2100 #endif
2101 /*
2102 * If the incoming packet was addressed directly to us(i.e. unicast),
2103 * use dst as the src for the reply.
2104 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible
2105 * (for example) when we encounter an error while forwarding procedure
2106 * destined to a duplicated address of ours.
2107 */
2108 for (ia = in6_ifaddr; ia; ia = ia->ia_next)
2109 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
2110 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2111 src = &t;
2112 break;
2113 }
2114 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
2115 /*
2116 * This is the case if the dst is our link-local address
2117 * and the sender is also ourseleves.
2118 */
2119 src = &t;
2120 }
2121
2122 if (src == 0) {
2123 int e;
2124 struct route_in6 ro;
2125
2126 /*
2127 * This case matches to multicasts, our anycast, or unicasts
2128 * that we do not own. Select a source address based on the
2129 * source address of the erroneous packet.
2130 */
2131 bzero(&ro, sizeof(ro));
2132 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e);
2133 if (ro.ro_rt)
2134 rtfree(ro.ro_rt); /* XXX: we could use this */
2135 if (src == NULL) {
2136 nd6log((LOG_DEBUG,
2137 "icmp6_reflect: source can't be determined: "
2138 "dst=%s, error=%d\n",
2139 ip6_sprintf(&sa6_src.sin6_addr), e));
2140 goto bad;
2141 }
2142 }
2143
2144 ip6->ip6_src = *src;
2145
2146 ip6->ip6_flow = 0;
2147 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2148 ip6->ip6_vfc |= IPV6_VERSION;
2149 ip6->ip6_nxt = IPPROTO_ICMPV6;
2150 if (m->m_pkthdr.rcvif) {
2151 /* XXX: This may not be the outgoing interface */
2152 ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim;
2153 } else
2154 ip6->ip6_hlim = ip6_defhlim;
2155
2156 icmp6->icmp6_cksum = 0;
2157 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2158 sizeof(struct ip6_hdr), plen);
2159
2160 /*
2161 * XXX option handling
2162 */
2163
2164 m->m_flags &= ~(M_BCAST|M_MCAST);
2165 #if IPSEC
2166 /* Don't lookup socket */
2167 if (ipsec_bypass == 0)
2168 (void)ipsec_setsocket(m, NULL);
2169 #endif /*IPSEC*/
2170
2171 #ifdef COMPAT_RFC1885
2172 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif);
2173 #else
2174 ip6_output(m, NULL, NULL, 0, NULL, &outif);
2175 #endif
2176 if (outif)
2177 icmp6_ifoutstat_inc(outif, type, code);
2178
2179 return;
2180
2181 bad:
2182 m_freem(m);
2183 return;
2184 }
2185
2186 void
2187 icmp6_fasttimo()
2188 {
2189
2190 mld6_fasttimeo();
2191 }
2192
2193 static const char *
2194 icmp6_redirect_diag(src6, dst6, tgt6)
2195 struct in6_addr *src6;
2196 struct in6_addr *dst6;
2197 struct in6_addr *tgt6;
2198 {
2199 static char buf[1024];
2200 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2201 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
2202 return buf;
2203 }
2204
2205 void
2206 icmp6_redirect_input(m, off)
2207 struct mbuf *m;
2208 int off;
2209 {
2210 struct ifnet *ifp = m->m_pkthdr.rcvif;
2211 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2212 struct nd_redirect *nd_rd;
2213 int icmp6len = ntohs(ip6->ip6_plen);
2214 char *lladdr = NULL;
2215 int lladdrlen = 0;
2216 u_char *redirhdr = NULL;
2217 int redirhdrlen = 0;
2218 struct rtentry *rt = NULL;
2219 int is_router;
2220 int is_onlink;
2221 struct in6_addr src6 = ip6->ip6_src;
2222 struct in6_addr redtgt6;
2223 struct in6_addr reddst6;
2224 union nd_opts ndopts;
2225
2226 if (!m || !ifp)
2227 return;
2228
2229 /* XXX if we are router, we don't update route by icmp6 redirect */
2230 if (ip6_forwarding)
2231 goto freeit;
2232 if (!icmp6_rediraccept)
2233 goto freeit;
2234
2235 #ifndef PULLDOWN_TEST
2236 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2237 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2238 #else
2239 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2240 if (nd_rd == NULL) {
2241 icmp6stat.icp6s_tooshort++;
2242 return;
2243 }
2244 #endif
2245 redtgt6 = nd_rd->nd_rd_target;
2246 reddst6 = nd_rd->nd_rd_dst;
2247
2248 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2249 redtgt6.s6_addr16[1] = htons(ifp->if_index);
2250 if (IN6_IS_ADDR_LINKLOCAL(&reddst6))
2251 reddst6.s6_addr16[1] = htons(ifp->if_index);
2252
2253 /* validation */
2254 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2255 nd6log((LOG_ERR,
2256 "ICMP6 redirect sent from %s rejected; "
2257 "must be from linklocal\n", ip6_sprintf(&src6)));
2258 goto bad;
2259 }
2260 if (ip6->ip6_hlim != 255) {
2261 nd6log((LOG_ERR,
2262 "ICMP6 redirect sent from %s rejected; "
2263 "hlim=%d (must be 255)\n",
2264 ip6_sprintf(&src6), ip6->ip6_hlim));
2265 goto bad;
2266 }
2267 {
2268 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2269 struct sockaddr_in6 sin6;
2270 struct in6_addr *gw6;
2271
2272 bzero(&sin6, sizeof(sin6));
2273 sin6.sin6_family = AF_INET6;
2274 sin6.sin6_len = sizeof(struct sockaddr_in6);
2275 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
2276 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
2277 if (rt) {
2278 if (rt->rt_gateway == NULL ||
2279 rt->rt_gateway->sa_family != AF_INET6) {
2280 nd6log((LOG_ERR,
2281 "ICMP6 redirect rejected; no route "
2282 "with inet6 gateway found for redirect dst: %s\n",
2283 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2284 rtfree(rt);
2285 goto bad;
2286 }
2287
2288 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2289 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2290 nd6log((LOG_ERR,
2291 "ICMP6 redirect rejected; "
2292 "not equal to gw-for-src=%s (must be same): "
2293 "%s\n",
2294 ip6_sprintf(gw6),
2295 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2296 rtfree(rt);
2297 goto bad;
2298 }
2299 } else {
2300 nd6log((LOG_ERR,
2301 "ICMP6 redirect rejected; "
2302 "no route found for redirect dst: %s\n",
2303 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2304 goto bad;
2305 }
2306 rtfree(rt);
2307 rt = NULL;
2308 }
2309 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2310 nd6log((LOG_ERR,
2311 "ICMP6 redirect rejected; "
2312 "redirect dst must be unicast: %s\n",
2313 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2314 goto bad;
2315 }
2316
2317 is_router = is_onlink = 0;
2318 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2319 is_router = 1; /* router case */
2320 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2321 is_onlink = 1; /* on-link destination case */
2322 if (!is_router && !is_onlink) {
2323 nd6log((LOG_ERR,
2324 "ICMP6 redirect rejected; "
2325 "neither router case nor onlink case: %s\n",
2326 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2327 goto bad;
2328 }
2329 /* validation passed */
2330
2331 icmp6len -= sizeof(*nd_rd);
2332 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2333 if (nd6_options(&ndopts) < 0) {
2334 nd6log((LOG_INFO, "icmp6_redirect_input: "
2335 "invalid ND option, rejected: %s\n",
2336 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2337 /* nd6_options have incremented stats */
2338 goto freeit;
2339 }
2340
2341 if (ndopts.nd_opts_tgt_lladdr) {
2342 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2343 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2344 }
2345
2346 if (ndopts.nd_opts_rh) {
2347 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2348 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2349 }
2350
2351 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2352 nd6log((LOG_INFO,
2353 "icmp6_redirect_input: lladdrlen mismatch for %s "
2354 "(if %d, icmp6 packet %d): %s\n",
2355 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
2356 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2357 goto bad;
2358 }
2359
2360 /* RFC 2461 8.3 */
2361 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2362 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2363
2364 if (!is_onlink) { /* better router case. perform rtredirect. */
2365 /* perform rtredirect */
2366 struct sockaddr_in6 sdst;
2367 struct sockaddr_in6 sgw;
2368 struct sockaddr_in6 ssrc;
2369
2370 bzero(&sdst, sizeof(sdst));
2371 bzero(&sgw, sizeof(sgw));
2372 bzero(&ssrc, sizeof(ssrc));
2373 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2374 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2375 sizeof(struct sockaddr_in6);
2376 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2377 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2378 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2379 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
2380 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST,
2381 (struct sockaddr *)&ssrc,
2382 (struct rtentry **)NULL);
2383 }
2384 /* finally update cached route in each socket via pfctlinput */
2385 {
2386 struct sockaddr_in6 sdst;
2387
2388 bzero(&sdst, sizeof(sdst));
2389 sdst.sin6_family = AF_INET6;
2390 sdst.sin6_len = sizeof(struct sockaddr_in6);
2391 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2392 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2393 #if IPSEC
2394 key_sa_routechange((struct sockaddr *)&sdst);
2395 #endif
2396 }
2397
2398 freeit:
2399 m_freem(m);
2400 return;
2401
2402 bad:
2403 icmp6stat.icp6s_badredirect++;
2404 m_freem(m);
2405 }
2406
2407 void
2408 icmp6_redirect_output(m0, rt)
2409 struct mbuf *m0;
2410 struct rtentry *rt;
2411 {
2412 struct ifnet *ifp; /* my outgoing interface */
2413 struct in6_addr *ifp_ll6;
2414 struct in6_addr *router_ll6;
2415 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2416 struct mbuf *m = NULL; /* newly allocated one */
2417 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2418 struct nd_redirect *nd_rd;
2419 size_t maxlen;
2420 u_char *p;
2421 struct ifnet *outif = NULL;
2422 struct sockaddr_in6 src_sa;
2423
2424 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2425
2426 /* if we are not router, we don't send icmp6 redirect */
2427 if (!ip6_forwarding || ip6_accept_rtadv)
2428 goto fail;
2429
2430 /* sanity check */
2431 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2432 goto fail;
2433
2434 /*
2435 * Address check:
2436 * the source address must identify a neighbor, and
2437 * the destination address must not be a multicast address
2438 * [RFC 2461, sec 8.2]
2439 */
2440 sip6 = mtod(m0, struct ip6_hdr *);
2441 bzero(&src_sa, sizeof(src_sa));
2442 src_sa.sin6_family = AF_INET6;
2443 src_sa.sin6_len = sizeof(src_sa);
2444 src_sa.sin6_addr = sip6->ip6_src;
2445 /* we don't currently use sin6_scope_id, but eventually use it */
2446 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src);
2447 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2448 goto fail;
2449 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2450 goto fail; /* what should we do here? */
2451
2452 /* rate limit */
2453 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2454 goto fail;
2455
2456 /*
2457 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2458 * we almost always ask for an mbuf cluster for simplicity.
2459 * (MHLEN < IPV6_MMTU is almost always true)
2460 */
2461 #if IPV6_MMTU >= MCLBYTES
2462 # error assumption failed about IPV6_MMTU and MCLBYTES
2463 #endif
2464 MGETHDR(m, M_DONTWAIT, MT_HEADER);
2465 if (m && IPV6_MMTU >= MHLEN)
2466 MCLGET(m, M_DONTWAIT);
2467 if (!m)
2468 goto fail;
2469 m->m_pkthdr.rcvif = NULL;
2470 m->m_len = 0;
2471 maxlen = M_TRAILINGSPACE(m);
2472 maxlen = min(IPV6_MMTU, maxlen);
2473 /* just for safety */
2474 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2475 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2476 goto fail;
2477 }
2478
2479 {
2480 /* get ip6 linklocal address for ifp(my outgoing interface). */
2481 struct in6_ifaddr *ia;
2482 if ((ia = in6ifa_ifpforlinklocal(ifp,
2483 IN6_IFF_NOTREADY|
2484 IN6_IFF_ANYCAST)) == NULL)
2485 goto fail;
2486 ifp_ll6 = &ia->ia_addr.sin6_addr;
2487 }
2488
2489 /* get ip6 linklocal address for the router. */
2490 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2491 struct sockaddr_in6 *sin6;
2492 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2493 router_ll6 = &sin6->sin6_addr;
2494 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2495 router_ll6 = (struct in6_addr *)NULL;
2496 } else
2497 router_ll6 = (struct in6_addr *)NULL;
2498
2499 /* ip6 */
2500 ip6 = mtod(m, struct ip6_hdr *);
2501 ip6->ip6_flow = 0;
2502 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2503 ip6->ip6_vfc |= IPV6_VERSION;
2504 /* ip6->ip6_plen will be set later */
2505 ip6->ip6_nxt = IPPROTO_ICMPV6;
2506 ip6->ip6_hlim = 255;
2507 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2508 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2509 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2510
2511 /* ND Redirect */
2512 nd_rd = (struct nd_redirect *)(ip6 + 1);
2513 nd_rd->nd_rd_type = ND_REDIRECT;
2514 nd_rd->nd_rd_code = 0;
2515 nd_rd->nd_rd_reserved = 0;
2516 if (rt->rt_flags & RTF_GATEWAY) {
2517 /*
2518 * nd_rd->nd_rd_target must be a link-local address in
2519 * better router cases.
2520 */
2521 if (!router_ll6)
2522 goto fail;
2523 bcopy(router_ll6, &nd_rd->nd_rd_target,
2524 sizeof(nd_rd->nd_rd_target));
2525 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2526 sizeof(nd_rd->nd_rd_dst));
2527 } else {
2528 /* make sure redtgt == reddst */
2529 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2530 sizeof(nd_rd->nd_rd_target));
2531 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2532 sizeof(nd_rd->nd_rd_dst));
2533 }
2534
2535 p = (u_char *)(nd_rd + 1);
2536
2537 if (!router_ll6)
2538 goto nolladdropt;
2539
2540 {
2541 /* target lladdr option */
2542 struct rtentry *rt_router = NULL;
2543 int len;
2544 struct sockaddr_dl *sdl;
2545 struct nd_opt_hdr *nd_opt;
2546 char *lladdr;
2547
2548 rt_router = nd6_lookup(router_ll6, 0, ifp);
2549 if (!rt_router)
2550 goto nolladdropt;
2551 len = sizeof(*nd_opt) + ifp->if_addrlen;
2552 len = (len + 7) & ~7; /*round by 8*/
2553 /* safety check */
2554 if (len + (p - (u_char *)ip6) > maxlen)
2555 goto nolladdropt;
2556 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2557 (rt_router->rt_flags & RTF_LLINFO) &&
2558 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2559 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
2560 sdl->sdl_alen) {
2561 nd_opt = (struct nd_opt_hdr *)p;
2562 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2563 nd_opt->nd_opt_len = len >> 3;
2564 lladdr = (char *)(nd_opt + 1);
2565 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2566 p += len;
2567 }
2568 }
2569 nolladdropt:;
2570
2571 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2572
2573 /* just to be safe */
2574 #ifdef M_DECRYPTED /*not openbsd*/
2575 if (m0->m_flags & M_DECRYPTED)
2576 goto noredhdropt;
2577 #endif
2578 if (p - (u_char *)ip6 > maxlen)
2579 goto noredhdropt;
2580
2581 {
2582 /* redirected header option */
2583 int len;
2584 struct nd_opt_rd_hdr *nd_opt_rh;
2585
2586 /*
2587 * compute the maximum size for icmp6 redirect header option.
2588 * XXX room for auth header?
2589 */
2590 len = maxlen - (p - (u_char *)ip6);
2591 len &= ~7;
2592
2593 /* This is just for simplicity. */
2594 if (m0->m_pkthdr.len != m0->m_len) {
2595 if (m0->m_next) {
2596 m_freem(m0->m_next);
2597 m0->m_next = NULL;
2598 }
2599 m0->m_pkthdr.len = m0->m_len;
2600 }
2601
2602 /*
2603 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2604 * about padding/truncate rule for the original IP packet.
2605 * From the discussion on IPv6imp in Feb 1999, the consensus was:
2606 * - "attach as much as possible" is the goal
2607 * - pad if not aligned (original size can be guessed by original
2608 * ip6 header)
2609 * Following code adds the padding if it is simple enough,
2610 * and truncates if not.
2611 */
2612 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2613 panic("assumption failed in %s:%d\n", __FILE__, __LINE__);
2614
2615 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2616 /* not enough room, truncate */
2617 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2618 } else {
2619 /* enough room, pad or truncate */
2620 size_t extra;
2621
2622 extra = m0->m_pkthdr.len % 8;
2623 if (extra) {
2624 /* pad if easy enough, truncate if not */
2625 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2626 /* pad */
2627 m0->m_len += (8 - extra);
2628 m0->m_pkthdr.len += (8 - extra);
2629 } else {
2630 /* truncate */
2631 m0->m_pkthdr.len -= extra;
2632 m0->m_len -= extra;
2633 }
2634 }
2635 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2636 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2637 }
2638
2639 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2640 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2641 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2642 nd_opt_rh->nd_opt_rh_len = len >> 3;
2643 p += sizeof(*nd_opt_rh);
2644 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2645
2646 /* connect m0 to m */
2647 m->m_next = m0;
2648 m->m_pkthdr.len = m->m_len + m0->m_len;
2649 }
2650 noredhdropt:;
2651
2652 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src))
2653 sip6->ip6_src.s6_addr16[1] = 0;
2654 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst))
2655 sip6->ip6_dst.s6_addr16[1] = 0;
2656 #if 0
2657 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
2658 ip6->ip6_src.s6_addr16[1] = 0;
2659 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
2660 ip6->ip6_dst.s6_addr16[1] = 0;
2661 #endif
2662 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target))
2663 nd_rd->nd_rd_target.s6_addr16[1] = 0;
2664 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst))
2665 nd_rd->nd_rd_dst.s6_addr16[1] = 0;
2666
2667 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2668
2669 nd_rd->nd_rd_cksum = 0;
2670 nd_rd->nd_rd_cksum
2671 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2672
2673 /* send the packet to outside... */
2674 #if IPSEC
2675 /* Don't lookup socket */
2676 if (ipsec_bypass == 0)
2677 (void)ipsec_setsocket(m, NULL);
2678 #endif /*IPSEC*/
2679 ip6_output(m, NULL, NULL, 0, NULL, &outif);
2680 if (outif) {
2681 icmp6_ifstat_inc(outif, ifs6_out_msg);
2682 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2683 }
2684 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2685
2686 return;
2687
2688 fail:
2689 if (m)
2690 m_freem(m);
2691 if (m0)
2692 m_freem(m0);
2693 }
2694
2695 #if HAVE_NRL_INPCB
2696 #define sotoin6pcb sotoinpcb
2697 #define in6pcb inpcb
2698 #define in6p_icmp6filt inp_icmp6filt
2699 #endif
2700 /*
2701 * ICMPv6 socket option processing.
2702 */
2703 int
2704 icmp6_ctloutput(so, sopt)
2705 struct socket *so;
2706 struct sockopt *sopt;
2707 {
2708 int error = 0;
2709 int optlen;
2710 struct inpcb *inp = sotoinpcb(so);
2711 int level, op, optname;
2712
2713 if (sopt) {
2714 level = sopt->sopt_level;
2715 op = sopt->sopt_dir;
2716 optname = sopt->sopt_name;
2717 optlen = sopt->sopt_valsize;
2718 } else
2719 level = op = optname = optlen = 0;
2720
2721 if (level != IPPROTO_ICMPV6) {
2722 return EINVAL;
2723 }
2724
2725 switch (op) {
2726 case PRCO_SETOPT:
2727 switch (optname) {
2728 case ICMP6_FILTER:
2729 {
2730 struct icmp6_filter *p;
2731
2732 if (optlen != sizeof(*p)) {
2733 error = EMSGSIZE;
2734 break;
2735 }
2736 if (inp->in6p_icmp6filt == NULL) {
2737 error = EINVAL;
2738 break;
2739 }
2740 error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen,
2741 optlen);
2742 break;
2743 }
2744
2745 default:
2746 error = ENOPROTOOPT;
2747 break;
2748 }
2749 break;
2750
2751 case PRCO_GETOPT:
2752 switch (optname) {
2753 case ICMP6_FILTER:
2754 {
2755 if (inp->in6p_icmp6filt == NULL) {
2756 error = EINVAL;
2757 break;
2758 }
2759 error = sooptcopyout(sopt, inp->in6p_icmp6filt,
2760 sizeof(struct icmp6_filter));
2761 break;
2762 }
2763
2764 default:
2765 error = ENOPROTOOPT;
2766 break;
2767 }
2768 break;
2769 }
2770
2771 return(error);
2772 }
2773 #if HAVE_NRL_INPCB
2774 #undef sotoin6pcb
2775 #undef in6pcb
2776 #undef in6p_icmp6filt
2777 #endif
2778
2779 #ifndef HAVE_PPSRATECHECK
2780 #ifndef timersub
2781 #define timersub(tvp, uvp, vvp) \
2782 do { \
2783 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
2784 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
2785 if ((vvp)->tv_usec < 0) { \
2786 (vvp)->tv_sec--; \
2787 (vvp)->tv_usec += 1000000; \
2788 } \
2789 } while (0)
2790 #endif
2791
2792 /*
2793 * ppsratecheck(): packets (or events) per second limitation.
2794 */
2795 static int
2796 ppsratecheck(lasttime, curpps, maxpps)
2797 struct timeval *lasttime;
2798 int *curpps;
2799 int maxpps; /* maximum pps allowed */
2800 {
2801 struct timeval tv, delta;
2802 int s, rv;
2803
2804 s = splclock();
2805 microtime(&tv);
2806 splx(s);
2807
2808 timersub(&tv, lasttime, &delta);
2809
2810 /*
2811 * check for 0,0 is so that the message will be seen at least once.
2812 * if more than one second have passed since the last update of
2813 * lasttime, reset the counter.
2814 *
2815 * we do increment *curpps even in *curpps < maxpps case, as some may
2816 * try to use *curpps for stat purposes as well.
2817 */
2818 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
2819 delta.tv_sec >= 1) {
2820 *lasttime = tv;
2821 *curpps = 0;
2822 rv = 1;
2823 } else if (maxpps < 0)
2824 rv = 1;
2825 else if (*curpps < maxpps)
2826 rv = 1;
2827 else
2828 rv = 0;
2829
2830 #if 1 /*DIAGNOSTIC?*/
2831 /* be careful about wrap-around */
2832 if (*curpps + 1 > *curpps)
2833 *curpps = *curpps + 1;
2834 #else
2835 /*
2836 * assume that there's not too many calls to this function.
2837 * not sure if the assumption holds, as it depends on *caller's*
2838 * behavior, not the behavior of this function.
2839 * IMHO it is wrong to make assumption on the caller's behavior,
2840 * so the above #if is #if 1, not #ifdef DIAGNOSTIC.
2841 */
2842 *curpps = *curpps + 1;
2843 #endif
2844
2845 return (rv);
2846 }
2847 #endif
2848
2849 /*
2850 * Perform rate limit check.
2851 * Returns 0 if it is okay to send the icmp6 packet.
2852 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2853 * limitation.
2854 *
2855 * XXX per-destination/type check necessary?
2856 */
2857 static int
2858 icmp6_ratelimit(dst, type, code)
2859 const struct in6_addr *dst; /* not used at this moment */
2860 const int type; /* not used at this moment */
2861 const int code; /* not used at this moment */
2862 {
2863 int ret;
2864
2865 ret = 0; /*okay to send*/
2866
2867 /* PPS limit */
2868 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2869 icmp6errppslim)) {
2870 /* The packet is subject to rate limit */
2871 ret++;
2872 }
2873
2874 return ret;
2875 }
mirror of XNU