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drm: Add atomic_cmpxchg()
[dragonfly.git] / sys / netinet6 / icmp6.c
blobdff8cc1cd4834de40f17b43baa51998e0d9a72d0
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 in6_clearscope(&oip6->ip6_src);
359 in6_clearscope(&oip6->ip6_dst);
360
361 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
362 icmp6->icmp6_type = type;
363 icmp6->icmp6_code = code;
364 icmp6->icmp6_pptr = htonl((u_int32_t)param);
365
366 /*
367 * icmp6_reflect() is designed to be in the input path.
368 * icmp6_error() can be called from both input and outut path,
369 * and if we are in output path rcvif could contain bogus value.
370 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
371 * information in ip header (nip6).
372 */
373 m->m_pkthdr.rcvif = NULL;
374
375 icmp6stat.icp6s_outhist[type]++;
376 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
377
378 return;
379
380 freeit:
381 /*
382 * If we can't tell wheter or not we can generate ICMP6, free it.
383 */
384 m_freem(m);
385 }
386
387 /*
388 * Process a received ICMP6 message.
389 */
390 int
391 icmp6_input(struct mbuf **mp, int *offp, int proto)
392 {
393 struct mbuf *m = *mp, *n;
394 struct ip6_hdr *ip6, *nip6;
395 struct icmp6_hdr *icmp6, *nicmp6;
396 int off = *offp;
397 int icmp6len = m->m_pkthdr.len - *offp;
398 int code, sum, noff;
399
400 #ifndef PULLDOWN_TEST
401 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
402 /* m might change if M_LOOP. So, call mtod after this */
403 #endif
404
405 /*
406 * Locate icmp6 structure in mbuf, and check
407 * that not corrupted and of at least minimum length
408 */
409
410 ip6 = mtod(m, struct ip6_hdr *);
411 if (icmp6len < sizeof(struct icmp6_hdr)) {
412 icmp6stat.icp6s_tooshort++;
413 goto freeit;
414 }
415
416 /*
417 * calculate the checksum
418 */
419 #ifndef PULLDOWN_TEST
420 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
421 #else
422 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
423 if (icmp6 == NULL) {
424 icmp6stat.icp6s_tooshort++;
425 return IPPROTO_DONE;
426 }
427 #endif
428 code = icmp6->icmp6_code;
429
430 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
431 nd6log((LOG_ERR,
432 "ICMP6 checksum error(%d|%x) %s\n",
433 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
434 icmp6stat.icp6s_checksum++;
435 goto freeit;
436 }
437
438 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
439 /*
440 * Deliver very specific ICMP6 type only.
441 * This is important to deilver TOOBIG. Otherwise PMTUD
442 * will not work.
443 */
444 switch (icmp6->icmp6_type) {
445 case ICMP6_DST_UNREACH:
446 case ICMP6_PACKET_TOO_BIG:
447 case ICMP6_TIME_EXCEEDED:
448 break;
449 default:
450 goto freeit;
451 }
452 }
453
454 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
455 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
456 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
457 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
458
459 switch (icmp6->icmp6_type) {
460 case ICMP6_DST_UNREACH:
461 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
462 switch (code) {
463 case ICMP6_DST_UNREACH_NOROUTE:
464 code = PRC_UNREACH_NET;
465 break;
466 case ICMP6_DST_UNREACH_ADMIN:
467 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
468 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
469 break;
470 case ICMP6_DST_UNREACH_ADDR:
471 code = PRC_HOSTDEAD;
472 break;
473 #ifdef COMPAT_RFC1885
474 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
475 code = PRC_UNREACH_SRCFAIL;
476 break;
477 #else
478 case ICMP6_DST_UNREACH_BEYONDSCOPE:
479 /* I mean "source address was incorrect." */
480 code = PRC_PARAMPROB;
481 break;
482 #endif
483 case ICMP6_DST_UNREACH_NOPORT:
484 code = PRC_UNREACH_PORT;
485 break;
486 default:
487 goto badcode;
488 }
489 goto deliver;
490 break;
491
492 case ICMP6_PACKET_TOO_BIG:
493 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
494 if (code != 0)
495 goto badcode;
496
497 code = PRC_MSGSIZE;
498
499 /*
500 * Updating the path MTU will be done after examining
501 * intermediate extension headers.
502 */
503 goto deliver;
504 break;
505
506 case ICMP6_TIME_EXCEEDED:
507 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
508 switch (code) {
509 case ICMP6_TIME_EXCEED_TRANSIT:
510 case ICMP6_TIME_EXCEED_REASSEMBLY:
511 code += PRC_TIMXCEED_INTRANS;
512 break;
513 default:
514 goto badcode;
515 }
516 goto deliver;
517 break;
518
519 case ICMP6_PARAM_PROB:
520 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
521 switch (code) {
522 case ICMP6_PARAMPROB_NEXTHEADER:
523 code = PRC_UNREACH_PROTOCOL;
524 break;
525 case ICMP6_PARAMPROB_HEADER:
526 case ICMP6_PARAMPROB_OPTION:
527 code = PRC_PARAMPROB;
528 break;
529 default:
530 goto badcode;
531 }
532 goto deliver;
533 break;
534
535 case ICMP6_ECHO_REQUEST:
536 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
537 if (code != 0)
538 goto badcode;
539 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
540 /* Give up remote */
541 break;
542 }
543 if ((n->m_flags & M_EXT) ||
544 n->m_len < off + sizeof(struct icmp6_hdr)) {
545 struct mbuf *n0 = n;
546 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
547 int n0len;
548
549 /*
550 * Prepare an internal mbuf. m_pullup() doesn't
551 * always copy the length we specified.
552 */
553 if (maxlen >= MCLBYTES) {
554 /* Give up remote */
555 m_freem(n0);
556 break;
557 }
558 n = m_getb(maxlen, M_NOWAIT, n0->m_type, M_PKTHDR);
559 if (n == NULL) {
560 /* Give up remote */
561 m_freem(n0);
562 break;
563 }
564 n0len = n0->m_pkthdr.len; /* save for use below */
565 M_MOVE_PKTHDR(n, n0);
566 /*
567 * Copy IPv6 and ICMPv6 only.
568 */
569 nip6 = mtod(n, struct ip6_hdr *);
570 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
571 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
572 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
573 noff = sizeof(struct ip6_hdr);
574 /* new mbuf contains only ipv6+icmpv6 headers */
575 n->m_len = noff + sizeof(struct icmp6_hdr);
576 /*
577 * Adjust mbuf. ip6_plen will be adjusted in
578 * ip6_output().
579 */
580 m_adj(n0, off + sizeof(struct icmp6_hdr));
581 /* recalculate complete packet size */
582 n->m_pkthdr.len = n0len + (noff - off);
583 n->m_next = n0;
584 } else {
585 nip6 = mtod(n, struct ip6_hdr *);
586 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off);
587 noff = off;
588 }
589 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
590 nicmp6->icmp6_code = 0;
591 if (n) {
592 icmp6stat.icp6s_reflect++;
593 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
594 icmp6_reflect(n, noff);
595 }
596 break;
597
598 case ICMP6_ECHO_REPLY:
599 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
600 if (code != 0)
601 goto badcode;
602 break;
603
604 case MLD_LISTENER_QUERY:
605 case MLD_LISTENER_REPORT:
606 if (icmp6len < sizeof(struct mld_hdr))
607 goto badlen;
608 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
609 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
610 else
611 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
612 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
613 /* give up local */
614 mld6_input(m, off);
615 m = NULL;
616 goto freeit;
617 }
618 mld6_input(n, off);
619 /* m stays. */
620 break;
621
622 case MLD_LISTENER_DONE:
623 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
624 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
625 goto badlen;
626 break; /* nothing to be done in kernel */
627
628 case MLD_MTRACE_RESP:
629 case MLD_MTRACE:
630 /* XXX: these two are experimental. not officially defind. */
631 /* XXX: per-interface statistics? */
632 break; /* just pass it to applications */
633
634 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
635 {
636 enum { WRU, FQDN } mode;
637
638 if (!icmp6_nodeinfo)
639 break;
640
641 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
642 mode = WRU;
643 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
644 mode = FQDN;
645 else
646 goto badlen;
647
648 #define hostnamelen strlen(hostname)
649 if (mode == FQDN) {
650 #ifndef PULLDOWN_TEST
651 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
652 IPPROTO_DONE);
653 #endif
654 n = m_copy(m, 0, M_COPYALL);
655 if (n)
656 n = ni6_input(n, off);
657 /* XXX meaningless if n == NULL */
658 noff = sizeof(struct ip6_hdr);
659 } else {
660 u_char *p;
661 int maxlen, maxhlen;
662
663 if ((icmp6_nodeinfo & 5) != 5)
664 break;
665
666 if (code != 0)
667 goto badcode;
668 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
669 if (maxlen >= MCLBYTES) {
670 /* Give up remote */
671 break;
672 }
673 n = m_getb(maxlen, M_NOWAIT, m->m_type, M_PKTHDR);
674 if (n == NULL) {
675 /* Give up remote */
676 break;
677 }
678 if (!m_dup_pkthdr(n, m, M_NOWAIT)) {
679 /*
680 * Previous code did a blind M_COPY_PKTHDR
681 * and said "just for rcvif". If true, then
682 * we could tolerate the dup failing (due to
683 * the deep copy of the tag chain). For now
684 * be conservative and just fail.
685 */
686 m_free(n);
687 break;
688 }
689 n->m_len = 0;
690 maxhlen = M_TRAILINGSPACE(n) - maxlen;
691 if (maxhlen > hostnamelen)
692 maxhlen = hostnamelen;
693 /*
694 * Copy IPv6 and ICMPv6 only.
695 */
696 nip6 = mtod(n, struct ip6_hdr *);
697 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
698 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
699 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
700 p = (u_char *)(nicmp6 + 1);
701 bzero(p, 4);
702 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
703 noff = sizeof(struct ip6_hdr);
704 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
705 sizeof(struct icmp6_hdr) + 4 + maxhlen;
706 nicmp6->icmp6_type = ICMP6_WRUREPLY;
707 nicmp6->icmp6_code = 0;
708 }
709 #undef hostnamelen
710 if (n) {
711 icmp6stat.icp6s_reflect++;
712 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
713 icmp6_reflect(n, noff);
714 }
715 break;
716 }
717
718 case ICMP6_WRUREPLY:
719 if (code != 0)
720 goto badcode;
721 break;
722
723 case ND_ROUTER_SOLICIT:
724 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
725 if (code != 0)
726 goto badcode;
727 if (icmp6len < sizeof(struct nd_router_solicit))
728 goto badlen;
729 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
730 /* give up local */
731 nd6_rs_input(m, off, icmp6len);
732 m = NULL;
733 goto freeit;
734 }
735 nd6_rs_input(n, off, icmp6len);
736 /* m stays. */
737 break;
738
739 case ND_ROUTER_ADVERT:
740 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
741 if (code != 0)
742 goto badcode;
743 if (icmp6len < sizeof(struct nd_router_advert))
744 goto badlen;
745 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
746 /* give up local */
747 nd6_ra_input(m, off, icmp6len);
748 m = NULL;
749 goto freeit;
750 }
751 nd6_ra_input(n, off, icmp6len);
752 /* m stays. */
753 break;
754
755 case ND_NEIGHBOR_SOLICIT:
756 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
757 if (code != 0)
758 goto badcode;
759 if (icmp6len < sizeof(struct nd_neighbor_solicit))
760 goto badlen;
761 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
762 /* give up local */
763 nd6_ns_input(m, off, icmp6len);
764 m = NULL;
765 goto freeit;
766 }
767 nd6_ns_input(n, off, icmp6len);
768 /* m stays. */
769 break;
770
771 case ND_NEIGHBOR_ADVERT:
772 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
773 if (code != 0)
774 goto badcode;
775 if (icmp6len < sizeof(struct nd_neighbor_advert))
776 goto badlen;
777 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
778 /* give up local */
779 nd6_na_input(m, off, icmp6len);
780 m = NULL;
781 goto freeit;
782 }
783 nd6_na_input(n, off, icmp6len);
784 /* m stays. */
785 break;
786
787 case ND_REDIRECT:
788 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
789 if (code != 0)
790 goto badcode;
791 if (icmp6len < sizeof(struct nd_redirect))
792 goto badlen;
793 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
794 /* give up local */
795 icmp6_redirect_input(m, off);
796 m = NULL;
797 goto freeit;
798 }
799 icmp6_redirect_input(n, off);
800 /* m stays. */
801 break;
802
803 case ICMP6_ROUTER_RENUMBERING:
804 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
805 code != ICMP6_ROUTER_RENUMBERING_RESULT)
806 goto badcode;
807 if (icmp6len < sizeof(struct icmp6_router_renum))
808 goto badlen;
809 break;
810
811 default:
812 nd6log((LOG_DEBUG,
813 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
814 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
815 ip6_sprintf(&ip6->ip6_dst),
816 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
817 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
818 /* ICMPv6 error: MUST deliver it by spec... */
819 code = PRC_NCMDS;
820 /* deliver */
821 } else {
822 /* ICMPv6 informational: MUST not deliver */
823 break;
824 }
825 deliver:
826 if (icmp6_notify_error(m, off, icmp6len, code)) {
827 /* In this case, m should've been freed. */
828 return (IPPROTO_DONE);
829 }
830 break;
831
832 badcode:
833 icmp6stat.icp6s_badcode++;
834 break;
835
836 badlen:
837 icmp6stat.icp6s_badlen++;
838 break;
839 }
840
841 /* deliver the packet to appropriate sockets */
842 icmp6_rip6_input(&m, *offp);
843
844 return IPPROTO_DONE;
845
846 freeit:
847 m_freem(m);
848 return IPPROTO_DONE;
849 }
850
851 static int
852 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code)
853 {
854 struct icmp6_hdr *icmp6;
855 struct ip6_hdr *eip6;
856 u_int32_t notifymtu;
857 struct sockaddr_in6 icmp6src, icmp6dst;
858
859 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
860 icmp6stat.icp6s_tooshort++;
861 goto freeit;
862 }
863 #ifndef PULLDOWN_TEST
864 IP6_EXTHDR_CHECK(m, off,
865 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
866 -1);
867 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
868 #else
869 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
870 sizeof(*icmp6) + sizeof(struct ip6_hdr));
871 if (icmp6 == NULL) {
872 icmp6stat.icp6s_tooshort++;
873 return (-1);
874 }
875 #endif
876 eip6 = (struct ip6_hdr *)(icmp6 + 1);
877
878 /* Detect the upper level protocol */
879 {
880 u_int8_t nxt = eip6->ip6_nxt;
881 int eoff = off + sizeof(struct icmp6_hdr) +
882 sizeof(struct ip6_hdr);
883 struct ip6ctlparam ip6cp;
884 struct in6_addr *finaldst = NULL;
885 int icmp6type = icmp6->icmp6_type;
886 struct ip6_frag *fh;
887 struct ip6_rthdr *rth;
888 int rthlen;
889
890 while (1) { /* XXX: should avoid infinite loop explicitly? */
891 struct ip6_ext *eh;
892
893 switch (nxt) {
894 case IPPROTO_HOPOPTS:
895 case IPPROTO_DSTOPTS:
896 case IPPROTO_AH:
897 #ifndef PULLDOWN_TEST
898 IP6_EXTHDR_CHECK(m, 0,
899 eoff + sizeof(struct ip6_ext), -1);
900 eh = (struct ip6_ext *)
901 (mtod(m, caddr_t) + eoff);
902 #else
903 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
904 eoff, sizeof(*eh));
905 if (eh == NULL) {
906 icmp6stat.icp6s_tooshort++;
907 return (-1);
908 }
909 #endif
910
911 if (nxt == IPPROTO_AH)
912 eoff += (eh->ip6e_len + 2) << 2;
913 else
914 eoff += (eh->ip6e_len + 1) << 3;
915 nxt = eh->ip6e_nxt;
916 break;
917 case IPPROTO_ROUTING:
918 /*
919 * When the erroneous packet contains a
920 * routing header, we should examine the
921 * header to determine the final destination.
922 * Otherwise, we can't properly update
923 * information that depends on the final
924 * destination (e.g. path MTU).
925 */
926 #ifndef PULLDOWN_TEST
927 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
928 -1);
929 rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
930 + eoff);
931 #else
932 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
933 eoff, sizeof(*rth));
934 if (rth == NULL) {
935 icmp6stat.icp6s_tooshort++;
936 return (-1);
937 }
938 #endif
939 rthlen = (rth->ip6r_len + 1) << 3;
940 eoff += rthlen;
941 nxt = rth->ip6r_nxt;
942 break;
943 case IPPROTO_FRAGMENT:
944 #ifndef PULLDOWN_TEST
945 IP6_EXTHDR_CHECK(m, 0, eoff +
946 sizeof(struct ip6_frag),
947 -1);
948 fh = (struct ip6_frag *)(mtod(m, caddr_t)
949 + eoff);
950 #else
951 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
952 eoff, sizeof(*fh));
953 if (fh == NULL) {
954 icmp6stat.icp6s_tooshort++;
955 return (-1);
956 }
957 #endif
958 /*
959 * Data after a fragment header is meaningless
960 * unless it is the first fragment, but
961 * we'll go to the notify label for path MTU
962 * discovery.
963 */
964 if (fh->ip6f_offlg & IP6F_OFF_MASK)
965 goto notify;
966
967 eoff += sizeof(struct ip6_frag);
968 nxt = fh->ip6f_nxt;
969 break;
970 default:
971 /*
972 * This case includes ESP and the No Next
973 * Header. In such cases going to the notify
974 * label does not have any meaning
975 * (i.e. pr_ctlinput will be NULL), but we go
976 * anyway since we might have to update
977 * path MTU information.
978 */
979 goto notify;
980 }
981 }
982 notify:
983 #ifndef PULLDOWN_TEST
984 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
985 #else
986 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
987 sizeof(*icmp6) + sizeof(struct ip6_hdr));
988 if (icmp6 == NULL) {
989 icmp6stat.icp6s_tooshort++;
990 return (-1);
991 }
992 #endif
993
994 eip6 = (struct ip6_hdr *)(icmp6 + 1);
995 bzero(&icmp6dst, sizeof(icmp6dst));
996 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
997 icmp6dst.sin6_family = AF_INET6;
998 if (finaldst == NULL)
999 icmp6dst.sin6_addr = eip6->ip6_dst;
1000 else
1001 icmp6dst.sin6_addr = *finaldst;
1002 if (in6_addr2zoneid(m->m_pkthdr.rcvif, &icmp6dst.sin6_addr,
1003 &icmp6dst.sin6_scope_id))
1004 goto freeit;
1005 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst,
1006 NULL, NULL)) {
1007 /* should be impossbile */
1008 nd6log((LOG_DEBUG,
1009 "icmp6_notify_error: in6_embedscope failed\n"));
1010 goto freeit;
1011 }
1012
1013 /*
1014 * retrieve parameters from the inner IPv6 header, and convert
1015 * them into sockaddr structures.
1016 */
1017 bzero(&icmp6src, sizeof(icmp6src));
1018 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1019 icmp6src.sin6_family = AF_INET6;
1020 icmp6src.sin6_addr = eip6->ip6_src;
1021 if (in6_addr2zoneid(m->m_pkthdr.rcvif, &icmp6src.sin6_addr,
1022 &icmp6src.sin6_scope_id))
1023 goto freeit;
1024 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src,
1025 NULL, NULL)) {
1026 /* should be impossbile */
1027 nd6log((LOG_DEBUG,
1028 "icmp6_notify_error: in6_embedscope failed\n"));
1029 goto freeit;
1030 }
1031 icmp6src.sin6_flowinfo =
1032 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1033
1034 if (finaldst == NULL)
1035 finaldst = &eip6->ip6_dst;
1036 ip6cp.ip6c_m = m;
1037 ip6cp.ip6c_icmp6 = icmp6;
1038 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1039 ip6cp.ip6c_off = eoff;
1040 ip6cp.ip6c_finaldst = finaldst;
1041 ip6cp.ip6c_src = &icmp6src;
1042 ip6cp.ip6c_nxt = nxt;
1043
1044 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1045 notifymtu = ntohl(icmp6->icmp6_mtu);
1046 ip6cp.ip6c_cmdarg = (void *)&notifymtu;
1047 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1048 }
1049
1050 so_pr_ctlinput(
1051 &inet6sw[ip6_protox[nxt]],
1052 code, (struct sockaddr *)&icmp6dst, &ip6cp);
1053 }
1054 return (0);
1055
1056 freeit:
1057 m_freem(m);
1058 return (-1);
1059 }
1060
1061 void
1062 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1063 {
1064 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1065 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1066 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1067 u_int mtu = ntohl(icmp6->icmp6_mtu);
1068 struct rtentry *rt = NULL;
1069 struct sockaddr_in6 sin6;
1070
1071 if (!validated)
1072 return;
1073
1074 bzero(&sin6, sizeof(sin6));
1075 sin6.sin6_family = PF_INET6;
1076 sin6.sin6_len = sizeof(struct sockaddr_in6);
1077 sin6.sin6_addr = *dst;
1078 /* XXX normally, this won't happen */
1079 if (IN6_IS_ADDR_LINKLOCAL(dst)) {
1080 sin6.sin6_addr.s6_addr16[1] =
1081 htons(m->m_pkthdr.rcvif->if_index);
1082 }
1083 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
1084 rt = rtpurelookup((struct sockaddr *)&sin6);
1085 if (rt != NULL && (rt->rt_flags & RTF_HOST) &&
1086 !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
1087 if (mtu < IPV6_MMTU) { /* XXX */
1088 rt->rt_rmx.rmx_locks |= RTV_MTU;
1089 } else if (mtu < rt->rt_ifp->if_mtu &&
1090 rt->rt_rmx.rmx_mtu > mtu) {
1091 icmp6stat.icp6s_pmtuchg++;
1092 rt->rt_rmx.rmx_mtu = mtu;
1093 }
1094 }
1095 if (rt)
1096 --rt->rt_refcnt;
1097 }
1098
1099 /*
1100 * Process a Node Information Query packet, based on
1101 * draft-ietf-ipngwg-icmp-name-lookups-07.
1102 *
1103 * Spec incompatibilities:
1104 * - IPv6 Subject address handling
1105 * - IPv4 Subject address handling support missing
1106 * - Proxy reply (answer even if it's not for me)
1107 * - joins NI group address at in6_ifattach() time only, does not cope
1108 * with hostname changes by sethostname(3)
1109 */
1110 #define hostnamelen strlen(hostname)
1111 static struct mbuf *
1112 ni6_input(struct mbuf *m, int off)
1113 {
1114 struct icmp6_nodeinfo *ni6, *nni6;
1115 struct mbuf *n = NULL;
1116 u_int16_t qtype;
1117 int subjlen;
1118 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1119 struct ni_reply_fqdn *fqdn;
1120 int addrs; /* for NI_QTYPE_NODEADDR */
1121 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1122 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
1123 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
1124 struct ip6_hdr *ip6;
1125 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1126 char *subj = NULL;
1127 struct in6_ifaddr *ia6 = NULL;
1128
1129 ip6 = mtod(m, struct ip6_hdr *);
1130 #ifndef PULLDOWN_TEST
1131 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1132 #else
1133 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1134 if (ni6 == NULL) {
1135 /* m is already reclaimed */
1136 return NULL;
1137 }
1138 #endif
1139
1140 /*
1141 * Validate IPv6 destination address.
1142 *
1143 * The Responder must discard the Query without further processing
1144 * unless it is one of the Responder's unicast or anycast addresses, or
1145 * a link-local scope multicast address which the Responder has joined.
1146 * [icmp-name-lookups-07, Section 4.]
1147 */
1148 bzero(&sin6, sizeof(sin6));
1149 sin6.sin6_family = AF_INET6;
1150 sin6.sin6_len = sizeof(struct sockaddr_in6);
1151 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
1152 /* XXX scopeid */
1153 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) {
1154 /* unicast/anycast, fine */
1155 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
1156 (icmp6_nodeinfo & 4) == 0) {
1157 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1158 "a temporary address in %s:%d",
1159 __FILE__, __LINE__));
1160 goto bad;
1161 }
1162 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr))
1163 ; /* link-local multicast, fine */
1164 else
1165 goto bad;
1166
1167 /* validate query Subject field. */
1168 qtype = ntohs(ni6->ni_qtype);
1169 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1170 switch (qtype) {
1171 case NI_QTYPE_NOOP:
1172 case NI_QTYPE_SUPTYPES:
1173 /* 07 draft */
1174 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1175 break;
1176 /* FALLTHROUGH */
1177 case NI_QTYPE_FQDN:
1178 case NI_QTYPE_NODEADDR:
1179 switch (ni6->ni_code) {
1180 case ICMP6_NI_SUBJ_IPV6:
1181 #if ICMP6_NI_SUBJ_IPV6 != 0
1182 case 0:
1183 #endif
1184 /*
1185 * backward compatibility - try to accept 03 draft
1186 * format, where no Subject is present.
1187 */
1188 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1189 subjlen == 0) {
1190 oldfqdn++;
1191 break;
1192 }
1193 #if ICMP6_NI_SUBJ_IPV6 != 0
1194 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1195 goto bad;
1196 #endif
1197
1198 if (subjlen != sizeof(sin6.sin6_addr))
1199 goto bad;
1200
1201 /*
1202 * Validate Subject address.
1203 *
1204 * Not sure what exactly "address belongs to the node"
1205 * means in the spec, is it just unicast, or what?
1206 *
1207 * At this moment we consider Subject address as
1208 * "belong to the node" if the Subject address equals
1209 * to the IPv6 destination address; validation for
1210 * IPv6 destination address should have done enough
1211 * check for us.
1212 *
1213 * We do not do proxy at this moment.
1214 */
1215 /* m_pulldown instead of copy? */
1216 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1217 subjlen, (caddr_t)&sin6.sin6_addr);
1218 if (in6_addr2zoneid(m->m_pkthdr.rcvif,
1219 &sin6.sin6_addr, &sin6.sin6_scope_id))
1220 goto bad;
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 if (in6_addr2zoneid(m->m_pkthdr.rcvif,
1227 &ip6->ip6_dst, &sin6_d.sin6_scope_id))
1228 goto bad;
1229 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL);
1230 subj = (char *)&sin6;
1231 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
1232 break;
1233
1234 /*
1235 * XXX if we are to allow other cases, we should really
1236 * be careful about scope here.
1237 * basically, we should disallow queries toward IPv6
1238 * destination X with subject Y, if scope(X) > scope(Y).
1239 * if we allow scope(X) > scope(Y), it will result in
1240 * information leakage across scope boundary.
1241 */
1242 goto bad;
1243
1244 case ICMP6_NI_SUBJ_FQDN:
1245 /*
1246 * Validate Subject name with gethostname(3).
1247 *
1248 * The behavior may need some debate, since:
1249 * - we are not sure if the node has FQDN as
1250 * hostname (returned by gethostname(3)).
1251 * - the code does wildcard match for truncated names.
1252 * however, we are not sure if we want to perform
1253 * wildcard match, if gethostname(3) side has
1254 * truncated hostname.
1255 */
1256 n = ni6_nametodns(hostname, hostnamelen, 0);
1257 if (!n || n->m_next || n->m_len == 0)
1258 goto bad;
1259 IP6_EXTHDR_GET(subj, char *, m,
1260 off + sizeof(struct icmp6_nodeinfo), subjlen);
1261 if (subj == NULL)
1262 goto bad;
1263 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1264 n->m_len)) {
1265 goto bad;
1266 }
1267 m_freem(n);
1268 n = NULL;
1269 break;
1270
1271 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1272 default:
1273 goto bad;
1274 }
1275 break;
1276 }
1277
1278 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1279 switch (qtype) {
1280 case NI_QTYPE_FQDN:
1281 if ((icmp6_nodeinfo & 1) == 0)
1282 goto bad;
1283 break;
1284 case NI_QTYPE_NODEADDR:
1285 if ((icmp6_nodeinfo & 2) == 0)
1286 goto bad;
1287 break;
1288 }
1289
1290 /* guess reply length */
1291 switch (qtype) {
1292 case NI_QTYPE_NOOP:
1293 break; /* no reply data */
1294 case NI_QTYPE_SUPTYPES:
1295 replylen += sizeof(u_int32_t);
1296 break;
1297 case NI_QTYPE_FQDN:
1298 /* XXX will append an mbuf */
1299 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1300 break;
1301 case NI_QTYPE_NODEADDR:
1302 addrs = ni6_addrs(ni6, m, &ifp, subj);
1303 if ((replylen += addrs * (sizeof(struct in6_addr) +
1304 sizeof(u_int32_t))) > MCLBYTES)
1305 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1306 break;
1307 default:
1308 /*
1309 * XXX: We must return a reply with the ICMP6 code
1310 * `unknown Qtype' in this case. However we regard the case
1311 * as an FQDN query for backward compatibility.
1312 * Older versions set a random value to this field,
1313 * so it rarely varies in the defined qtypes.
1314 * But the mechanism is not reliable...
1315 * maybe we should obsolete older versions.
1316 */
1317 qtype = NI_QTYPE_FQDN;
1318 /* XXX will append an mbuf */
1319 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1320 oldfqdn++;
1321 break;
1322 }
1323
1324 /* allocate an mbuf to reply. */
1325 if (replylen > MCLBYTES) {
1326 /*
1327 * XXX: should we try to allocate more? But MCLBYTES
1328 * is probably much larger than IPV6_MMTU...
1329 */
1330 goto bad;
1331 }
1332 n = m_getb(replylen, M_NOWAIT, m->m_type, M_PKTHDR);
1333 if (n == NULL) {
1334 m_freem(m);
1335 return (NULL);
1336 }
1337 M_MOVE_PKTHDR(n, m); /* just for recvif */
1338 n->m_pkthdr.len = n->m_len = replylen;
1339
1340 /* copy mbuf header and IPv6 + Node Information base headers */
1341 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1342 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1343 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1344
1345 /* qtype dependent procedure */
1346 switch (qtype) {
1347 case NI_QTYPE_NOOP:
1348 nni6->ni_code = ICMP6_NI_SUCCESS;
1349 nni6->ni_flags = 0;
1350 break;
1351 case NI_QTYPE_SUPTYPES:
1352 {
1353 u_int32_t v;
1354 nni6->ni_code = ICMP6_NI_SUCCESS;
1355 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1356 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1357 v = (u_int32_t)htonl(0x0000000f);
1358 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1359 break;
1360 }
1361 case NI_QTYPE_FQDN:
1362 nni6->ni_code = ICMP6_NI_SUCCESS;
1363 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1364 sizeof(struct ip6_hdr) +
1365 sizeof(struct icmp6_nodeinfo));
1366 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1367 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1368 /*
1369 * XXX do we really have FQDN in variable "hostname"?
1370 */
1371 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1372 if (n->m_next == NULL)
1373 goto bad;
1374 /* XXX we assume that n->m_next is not a chain */
1375 if (n->m_next->m_next != NULL)
1376 goto bad;
1377 n->m_pkthdr.len += n->m_next->m_len;
1378 break;
1379 case NI_QTYPE_NODEADDR:
1380 {
1381 int lenlim, copied;
1382
1383 nni6->ni_code = ICMP6_NI_SUCCESS;
1384 n->m_pkthdr.len = n->m_len =
1385 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1386 lenlim = M_TRAILINGSPACE(n);
1387 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1388 /* XXX: reset mbuf length */
1389 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1390 sizeof(struct icmp6_nodeinfo) + copied;
1391 break;
1392 }
1393 default:
1394 break; /* XXX impossible! */
1395 }
1396
1397 nni6->ni_type = ICMP6_NI_REPLY;
1398 m_freem(m);
1399 return (n);
1400
1401 bad:
1402 m_freem(m);
1403 if (n)
1404 m_freem(n);
1405 return (NULL);
1406 }
1407 #undef hostnamelen
1408
1409 /*
1410 * make a mbuf with DNS-encoded string. no compression support.
1411 *
1412 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1413 * treated as truncated name (two \0 at the end). this is a wild guess.
1414 */
1415 static struct mbuf *
1416 ni6_nametodns(const char *name, int namelen,
1417 int old) /* return pascal string if non-zero */
1418 {
1419 struct mbuf *m;
1420 char *cp, *ep;
1421 const char *p, *q;
1422 int i, len, nterm;
1423
1424 if (old)
1425 len = namelen + 1;
1426 else
1427 len = MCLBYTES;
1428
1429 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1430 m = m_getb(len, M_NOWAIT, MT_DATA, 0);
1431 if (!m)
1432 goto fail;
1433
1434 if (old) {
1435 m->m_len = len;
1436 *mtod(m, char *) = namelen;
1437 bcopy(name, mtod(m, char *) + 1, namelen);
1438 return m;
1439 } else {
1440 m->m_len = 0;
1441 cp = mtod(m, char *);
1442 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1443
1444 /* if not certain about my name, return empty buffer */
1445 if (namelen == 0)
1446 return m;
1447
1448 /*
1449 * guess if it looks like shortened hostname, or FQDN.
1450 * shortened hostname needs two trailing "\0".
1451 */
1452 i = 0;
1453 for (p = name; p < name + namelen; p++) {
1454 if (*p && *p == '.')
1455 i++;
1456 }
1457 if (i < 2)
1458 nterm = 2;
1459 else
1460 nterm = 1;
1461
1462 p = name;
1463 while (cp < ep && p < name + namelen) {
1464 i = 0;
1465 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1466 i++;
1467 /* result does not fit into mbuf */
1468 if (cp + i + 1 >= ep)
1469 goto fail;
1470 /*
1471 * DNS label length restriction, RFC1035 page 8.
1472 * "i == 0" case is included here to avoid returning
1473 * 0-length label on "foo..bar".
1474 */
1475 if (i <= 0 || i >= 64)
1476 goto fail;
1477 *cp++ = i;
1478 bcopy(p, cp, i);
1479 cp += i;
1480 p = q;
1481 if (p < name + namelen && *p == '.')
1482 p++;
1483 }
1484 /* termination */
1485 if (cp + nterm >= ep)
1486 goto fail;
1487 while (nterm-- > 0)
1488 *cp++ = '\0';
1489 m->m_len = cp - mtod(m, char *);
1490 return m;
1491 }
1492
1493 panic("should not reach here");
1494 /* NOTREACHED */
1495
1496 fail:
1497 if (m)
1498 m_freem(m);
1499 return NULL;
1500 }
1501
1502 /*
1503 * check if two DNS-encoded string matches. takes care of truncated
1504 * form (with \0\0 at the end). no compression support.
1505 * XXX upper/lowercase match (see RFC2065)
1506 */
1507 static int
1508 ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1509 {
1510 const char *a0, *b0;
1511 int l;
1512
1513 /* simplest case - need validation? */
1514 if (alen == blen && bcmp(a, b, alen) == 0)
1515 return 1;
1516
1517 a0 = a;
1518 b0 = b;
1519
1520 /* termination is mandatory */
1521 if (alen < 2 || blen < 2)
1522 return 0;
1523 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1524 return 0;
1525 alen--;
1526 blen--;
1527
1528 while (a - a0 < alen && b - b0 < blen) {
1529 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1530 return 0;
1531
1532 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1533 return 0;
1534 /* we don't support compression yet */
1535 if (a[0] >= 64 || b[0] >= 64)
1536 return 0;
1537
1538 /* truncated case */
1539 if (a[0] == 0 && a - a0 == alen - 1)
1540 return 1;
1541 if (b[0] == 0 && b - b0 == blen - 1)
1542 return 1;
1543 if (a[0] == 0 || b[0] == 0)
1544 return 0;
1545
1546 if (a[0] != b[0])
1547 return 0;
1548 l = a[0];
1549 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1550 return 0;
1551 if (bcmp(a + 1, b + 1, l) != 0)
1552 return 0;
1553
1554 a += 1 + l;
1555 b += 1 + l;
1556 }
1557
1558 if (a - a0 == alen && b - b0 == blen)
1559 return 1;
1560 else
1561 return 0;
1562 }
1563
1564 /*
1565 * calculate the number of addresses to be returned in the node info reply.
1566 */
1567 static int
1568 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
1569 char *subj)
1570 {
1571 const struct ifnet_array *arr;
1572 struct in6_ifaddr *ifa6;
1573 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
1574 int addrs = 0, addrsofif, iffound = 0;
1575 int niflags = ni6->ni_flags;
1576 int i;
1577
1578 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1579 switch (ni6->ni_code) {
1580 case ICMP6_NI_SUBJ_IPV6:
1581 if (subj == NULL) /* must be impossible... */
1582 return (0);
1583 subj_ip6 = (struct sockaddr_in6 *)subj;
1584 break;
1585 default:
1586 /*
1587 * XXX: we only support IPv6 subject address for
1588 * this Qtype.
1589 */
1590 return (0);
1591 }
1592 }
1593
1594 arr = ifnet_array_get();
1595 for (i = 0; i < arr->ifnet_count; ++i) {
1596 struct ifnet *ifp = arr->ifnet_arr[i];
1597 struct ifaddr_container *ifac;
1598
1599 addrsofif = 0;
1600 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link)
1601 {
1602 struct ifaddr *ifa = ifac->ifa;
1603
1604 if (ifa->ifa_addr->sa_family != AF_INET6)
1605 continue;
1606 ifa6 = (struct in6_ifaddr *)ifa;
1607
1608 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1609 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
1610 &ifa6->ia_addr.sin6_addr))
1611 iffound = 1;
1612
1613 /*
1614 * IPv4-mapped addresses can only be returned by a
1615 * Node Information proxy, since they represent
1616 * addresses of IPv4-only nodes, which perforce do
1617 * not implement this protocol.
1618 * [icmp-name-lookups-07, Section 5.4]
1619 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1620 * this function at this moment.
1621 */
1622
1623 /* What do we have to do about ::1? */
1624 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1625 case IPV6_ADDR_SCOPE_LINKLOCAL:
1626 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1627 continue;
1628 break;
1629 case IPV6_ADDR_SCOPE_SITELOCAL:
1630 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1631 continue;
1632 break;
1633 case IPV6_ADDR_SCOPE_GLOBAL:
1634 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1635 continue;
1636 break;
1637 default:
1638 continue;
1639 }
1640
1641 /*
1642 * check if anycast is okay.
1643 * XXX: just experimental. not in the spec.
1644 */
1645 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) &&
1646 !(niflags & NI_NODEADDR_FLAG_ANYCAST))
1647 continue; /* we need only unicast addresses */
1648 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) &&
1649 (icmp6_nodeinfo & 4) == 0) {
1650 continue;
1651 }
1652 addrsofif++; /* count the address */
1653 }
1654 if (iffound) {
1655 *ifpp = ifp;
1656 return (addrsofif);
1657 }
1658
1659 addrs += addrsofif;
1660 }
1661
1662 return (addrs);
1663 }
1664
1665 static int
1666 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
1667 struct ifnet *ifp0, int resid)
1668 {
1669 const struct ifnet_array *arr;
1670 struct in6_ifaddr *ifa6;
1671 int copied = 0, allow_deprecated = 0;
1672 u_char *cp = (u_char *)(nni6 + 1);
1673 int niflags = ni6->ni_flags;
1674 u_int32_t ltime;
1675 int idx, idx_dep = -1;
1676
1677 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1678 return (0); /* needless to copy */
1679
1680 arr = ifnet_array_get();
1681 if (ifp0 == NULL) {
1682 idx = 0;
1683 } else {
1684 for (idx = 0; idx < arr->ifnet_count; ++idx) {
1685 if (arr->ifnet_arr[idx] == ifp0)
1686 break;
1687 }
1688 }
1689
1690 again:
1691
1692 for (; idx < arr->ifnet_count; ++idx) {
1693 struct ifnet *ifp = arr->ifnet_arr[idx];
1694 struct ifaddr_container *ifac;
1695
1696 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1697 struct ifaddr *ifa = ifac->ifa;
1698
1699 if (ifa->ifa_addr->sa_family != AF_INET6)
1700 continue;
1701 ifa6 = (struct in6_ifaddr *)ifa;
1702
1703 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) &&
1704 allow_deprecated == 0) {
1705 /*
1706 * prefererred address should be put before
1707 * deprecated addresses.
1708 */
1709
1710 /* record the interface for later search */
1711 if (idx_dep < 0)
1712 idx_dep = idx;
1713
1714 continue;
1715 }
1716 else if (!(ifa6->ia6_flags & IN6_IFF_DEPRECATED) &&
1717 allow_deprecated != 0)
1718 continue; /* we now collect deprecated addrs */
1719
1720 /* What do we have to do about ::1? */
1721 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1722 case IPV6_ADDR_SCOPE_LINKLOCAL:
1723 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1724 continue;
1725 break;
1726 case IPV6_ADDR_SCOPE_SITELOCAL:
1727 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1728 continue;
1729 break;
1730 case IPV6_ADDR_SCOPE_GLOBAL:
1731 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1732 continue;
1733 break;
1734 default:
1735 continue;
1736 }
1737
1738 /*
1739 * check if anycast is okay.
1740 * XXX: just experimental. not in the spec.
1741 */
1742 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) &&
1743 !(niflags & NI_NODEADDR_FLAG_ANYCAST))
1744 continue;
1745 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) &&
1746 (icmp6_nodeinfo & 4) == 0) {
1747 continue;
1748 }
1749
1750 /* now we can copy the address */
1751 if (resid < sizeof(struct in6_addr) +
1752 sizeof(u_int32_t)) {
1753 /*
1754 * We give up much more copy.
1755 * Set the truncate flag and return.
1756 */
1757 nni6->ni_flags |=
1758 NI_NODEADDR_FLAG_TRUNCATE;
1759 return (copied);
1760 }
1761
1762 /*
1763 * Set the TTL of the address.
1764 * The TTL value should be one of the following
1765 * according to the specification:
1766 *
1767 * 1. The remaining lifetime of a DHCP lease on the
1768 * address, or
1769 * 2. The remaining Valid Lifetime of a prefix from
1770 * which the address was derived through Stateless
1771 * Autoconfiguration.
1772 *
1773 * Note that we currently do not support stateful
1774 * address configuration by DHCPv6, so the former
1775 * case can't happen.
1776 */
1777 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1778 ltime = ND6_INFINITE_LIFETIME;
1779 else {
1780 if (ifa6->ia6_lifetime.ia6t_expire >
1781 time_uptime)
1782 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime);
1783 else
1784 ltime = 0;
1785 }
1786
1787 bcopy(&ltime, cp, sizeof(u_int32_t));
1788 cp += sizeof(u_int32_t);
1789
1790 /* copy the address itself */
1791 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1792 sizeof(struct in6_addr));
1793 in6_clearscope((struct in6_addr *)cp); /* XXX */
1794 cp += sizeof(struct in6_addr);
1795
1796 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1797 copied += (sizeof(struct in6_addr) +
1798 sizeof(u_int32_t));
1799 }
1800 if (ifp0) /* we need search only on the specified IF */
1801 break;
1802 }
1803
1804 if (allow_deprecated == 0 && idx_dep >= 0) {
1805 idx = idx_dep;
1806 allow_deprecated = 1;
1807
1808 goto again;
1809 }
1810
1811 return (copied);
1812 }
1813
1814 /*
1815 * XXX almost dup'ed code with rip6_input.
1816 */
1817 static int
1818 icmp6_rip6_input(struct mbuf **mp, int off)
1819 {
1820 struct mbuf *m = *mp;
1821 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1822 struct in6pcb *in6p;
1823 struct in6pcb *last = NULL;
1824 struct sockaddr_in6 fromsa;
1825 struct icmp6_hdr *icmp6;
1826 struct mbuf *opts = NULL;
1827
1828 #ifndef PULLDOWN_TEST
1829 /* this is assumed to be safe. */
1830 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1831 #else
1832 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1833 if (icmp6 == NULL) {
1834 /* m is already reclaimed */
1835 return IPPROTO_DONE;
1836 }
1837 #endif
1838
1839 bzero(&fromsa, sizeof(fromsa));
1840 fromsa.sin6_len = sizeof(struct sockaddr_in6);
1841 fromsa.sin6_family = AF_INET6;
1842 /* KAME hack: recover scopeid */
1843 in6_recoverscope(&fromsa, &ip6->ip6_src, m->m_pkthdr.rcvif);
1844
1845 LIST_FOREACH(in6p, &ripcbinfo.pcblisthead, inp_list)
1846 {
1847 if (in6p->inp_flags & INP_PLACEMARKER)
1848 continue;
1849 if (!INP_ISIPV6(in6p))
1850 continue;
1851 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
1852 continue;
1853 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1854 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1855 continue;
1856 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1857 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1858 continue;
1859 if (in6p->in6p_icmp6filt
1860 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1861 in6p->in6p_icmp6filt))
1862 continue;
1863 if (last) {
1864 struct socket *so;
1865 struct mbuf *n;
1866
1867 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1868 if (last->in6p_flags & IN6P_CONTROLOPTS)
1869 ip6_savecontrol(last, &opts, ip6, n);
1870 /* strip intermediate headers */
1871 m_adj(n, off);
1872 so = last->in6p_socket;
1873 lwkt_gettoken(&so->so_rcv.ssb_token);
1874 if (ssb_appendaddr(&so->so_rcv,
1875 (struct sockaddr *)&fromsa, n, opts) == 0) {
1876 /* should notify about lost packet */
1877 m_freem(n);
1878 if (opts)
1879 m_freem(opts);
1880 } else {
1881 sorwakeup(so);
1882 }
1883 lwkt_reltoken(&so->so_rcv.ssb_token);
1884 opts = NULL;
1885 }
1886 }
1887 last = in6p;
1888 }
1889 if (last) {
1890 struct socket *so;
1891
1892 if (last->in6p_flags & IN6P_CONTROLOPTS)
1893 ip6_savecontrol(last, &opts, ip6, m);
1894 /* strip intermediate headers */
1895 m_adj(m, off);
1896 so = last->in6p_socket;
1897 lwkt_gettoken(&so->so_rcv.ssb_token);
1898 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&fromsa,
1899 m, opts) == 0) {
1900 m_freem(m);
1901 if (opts)
1902 m_freem(opts);
1903 } else {
1904 sorwakeup(so);
1905 }
1906 lwkt_reltoken(&so->so_rcv.ssb_token);
1907 } else {
1908 m_freem(m);
1909 ip6stat.ip6s_delivered--;
1910 }
1911 return IPPROTO_DONE;
1912 }
1913
1914 /*
1915 * Reflect the ip6 packet back to the source.
1916 * OFF points to the icmp6 header, counted from the top of the mbuf.
1917 */
1918 void
1919 icmp6_reflect(struct mbuf *m, size_t off)
1920 {
1921 struct ip6_hdr *ip6;
1922 struct icmp6_hdr *icmp6;
1923 struct in6_ifaddr *ia;
1924 struct in6_addr t, *src = NULL;
1925 int plen;
1926 int type, code;
1927 struct ifnet *outif = NULL;
1928 struct sockaddr_in6 sa6_src, sa6_dst;
1929 #ifdef COMPAT_RFC1885
1930 int mtu = IPV6_MMTU;
1931 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst;
1932 #endif
1933
1934 /* too short to reflect */
1935 if (off < sizeof(struct ip6_hdr)) {
1936 nd6log((LOG_DEBUG,
1937 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
1938 (u_long)off, (u_long)sizeof(struct ip6_hdr),
1939 __FILE__, __LINE__));
1940 goto bad;
1941 }
1942
1943 /*
1944 * If there are extra headers between IPv6 and ICMPv6, strip
1945 * off that header first.
1946 */
1947 #ifdef DIAGNOSTIC
1948 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
1949 panic("assumption failed in icmp6_reflect");
1950 #endif
1951 if (off > sizeof(struct ip6_hdr)) {
1952 size_t l;
1953 struct ip6_hdr nip6;
1954
1955 l = off - sizeof(struct ip6_hdr);
1956 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
1957 m_adj(m, l);
1958 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
1959 if (m->m_len < l) {
1960 if ((m = m_pullup(m, l)) == NULL)
1961 return;
1962 }
1963 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
1964 } else /* off == sizeof(struct ip6_hdr) */ {
1965 size_t l;
1966 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
1967 if (m->m_len < l) {
1968 if ((m = m_pullup(m, l)) == NULL)
1969 return;
1970 }
1971 }
1972 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
1973 ip6 = mtod(m, struct ip6_hdr *);
1974 ip6->ip6_nxt = IPPROTO_ICMPV6;
1975 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
1976 type = icmp6->icmp6_type; /* keep type for statistics */
1977 code = icmp6->icmp6_code; /* ditto. */
1978
1979 t = ip6->ip6_dst;
1980 /*
1981 * ip6_input() drops a packet if its src is multicast.
1982 * So, the src is never multicast.
1983 */
1984 ip6->ip6_dst = ip6->ip6_src;
1985
1986 /*
1987 * XXX: make sure to embed scope zone information, using
1988 * already embedded IDs or the received interface (if any).
1989 * Note that rcvif may be NULL.
1990 * TODO: scoped routing case (XXX).
1991 */
1992 bzero(&sa6_src, sizeof(sa6_src));
1993 sa6_src.sin6_family = AF_INET6;
1994 sa6_src.sin6_len = sizeof(sa6_src);
1995 sa6_src.sin6_addr = ip6->ip6_dst;
1996 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
1997 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL);
1998 bzero(&sa6_dst, sizeof(sa6_dst));
1999 sa6_dst.sin6_family = AF_INET6;
2000 sa6_dst.sin6_len = sizeof(sa6_dst);
2001 sa6_dst.sin6_addr = t;
2002 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
2003 in6_embedscope(&t, &sa6_dst, NULL, NULL);
2004
2005 #ifdef COMPAT_RFC1885
2006 /*
2007 * xxx guess MTU
2008 * RFC 1885 requires that echo reply should be truncated if it
2009 * does not fit in with (return) path MTU, but the description was
2010 * removed in the new spec.
2011 */
2012 if (icmp6_reflect_rt.ro_rt == 0 ||
2013 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) {
2014 if (icmp6_reflect_rt.ro_rt) {
2015 RTFREE(icmp6_reflect_rt.ro_rt);
2016 icmp6_reflect_rt.ro_rt = 0;
2017 }
2018 bzero(sin6, sizeof(*sin6));
2019 sin6->sin6_family = PF_INET6;
2020 sin6->sin6_len = sizeof(struct sockaddr_in6);
2021 sin6->sin6_addr = ip6->ip6_dst;
2022
2023 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt,
2024 RTF_PRCLONING);
2025 }
2026
2027 if (icmp6_reflect_rt.ro_rt == 0)
2028 goto bad;
2029
2030 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST)
2031 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu)
2032 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu;
2033
2034 if (mtu < m->m_pkthdr.len) {
2035 plen -= (m->m_pkthdr.len - mtu);
2036 m_adj(m, mtu - m->m_pkthdr.len);
2037 }
2038 #endif
2039 /*
2040 * If the incoming packet was addressed directly to us(i.e. unicast),
2041 * use dst as the src for the reply.
2042 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible
2043 * (for example) when we encounter an error while forwarding procedure
2044 * destined to a duplicated address of ours.
2045 */
2046 for (ia = in6_ifaddr; ia; ia = ia->ia_next)
2047 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
2048 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2049 src = &t;
2050 break;
2051 }
2052 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
2053 /*
2054 * This is the case if the dst is our link-local address
2055 * and the sender is also ourselves.
2056 */
2057 src = &t;
2058 }
2059
2060 if (src == NULL) {
2061 int e;
2062 struct route_in6 ro;
2063
2064 /*
2065 * This case matches to multicasts, our anycast, or unicasts
2066 * that we do not own. Select a source address based on the
2067 * source address of the erroneous packet.
2068 */
2069 bzero(&ro, sizeof(ro));
2070 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e, NULL);
2071 if (ro.ro_rt)
2072 RTFREE(ro.ro_rt); /* XXX: we could use this */
2073 if (src == NULL) {
2074 nd6log((LOG_DEBUG,
2075 "icmp6_reflect: source can't be determined: "
2076 "dst=%s, error=%d\n",
2077 ip6_sprintf(&sa6_src.sin6_addr), e));
2078 goto bad;
2079 }
2080 }
2081
2082 ip6->ip6_src = *src;
2083
2084 ip6->ip6_flow = 0;
2085 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2086 ip6->ip6_vfc |= IPV6_VERSION;
2087 ip6->ip6_nxt = IPPROTO_ICMPV6;
2088 if (m->m_pkthdr.rcvif) {
2089 /* XXX: This may not be the outgoing interface */
2090 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2091 if (ip6->ip6_hlim < ip6_minhlim)
2092 ip6->ip6_hlim = ip6_minhlim;
2093 } else {
2094 ip6->ip6_hlim = ip6_defhlim;
2095 }
2096
2097 icmp6->icmp6_cksum = 0;
2098 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2099 sizeof(struct ip6_hdr), plen);
2100
2101 /*
2102 * XXX option handling
2103 */
2104
2105 m->m_flags &= ~(M_BCAST|M_MCAST);
2106
2107 #ifdef COMPAT_RFC1885
2108 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL);
2109 #else
2110 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2111 #endif
2112 if (outif)
2113 icmp6_ifoutstat_inc(outif, type, code);
2114
2115 return;
2116
2117 bad:
2118 m_freem(m);
2119 return;
2120 }
2121
2122 void
2123 icmp6_fasttimo(void)
2124 {
2125
2126 mld6_fasttimeo();
2127 }
2128
2129 static const char *
2130 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
2131 struct in6_addr *tgt6)
2132 {
2133 static char buf[1024];
2134 ksnprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2135 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
2136 return buf;
2137 }
2138
2139 void
2140 icmp6_redirect_input(struct mbuf *m, int off)
2141 {
2142 struct ifnet *ifp = m->m_pkthdr.rcvif;
2143 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2144 struct nd_redirect *nd_rd;
2145 int icmp6len = ntohs(ip6->ip6_plen);
2146 char *lladdr = NULL;
2147 int lladdrlen = 0;
2148 #if 0
2149 u_char *redirhdr = NULL;
2150 int redirhdrlen = 0;
2151 #endif
2152 struct rtentry *rt = NULL;
2153 int is_router;
2154 int is_onlink;
2155 struct in6_addr src6 = ip6->ip6_src;
2156 struct in6_addr redtgt6;
2157 struct in6_addr reddst6;
2158 union nd_opts ndopts;
2159
2160 if (!m || !ifp)
2161 return;
2162
2163 /* XXX if we are router, we don't update route by icmp6 redirect */
2164 if (ip6_forwarding)
2165 goto freeit;
2166 if (!icmp6_rediraccept)
2167 goto freeit;
2168
2169 #ifndef PULLDOWN_TEST
2170 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2171 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2172 #else
2173 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2174 if (nd_rd == NULL) {
2175 icmp6stat.icp6s_tooshort++;
2176 return;
2177 }
2178 #endif
2179 redtgt6 = nd_rd->nd_rd_target;
2180 reddst6 = nd_rd->nd_rd_dst;
2181
2182 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2183 redtgt6.s6_addr16[1] = htons(ifp->if_index);
2184 if (IN6_IS_ADDR_LINKLOCAL(&reddst6))
2185 reddst6.s6_addr16[1] = htons(ifp->if_index);
2186
2187 /* validation */
2188 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2189 nd6log((LOG_ERR,
2190 "ICMP6 redirect sent from %s rejected; "
2191 "must be from linklocal\n", ip6_sprintf(&src6)));
2192 goto bad;
2193 }
2194 if (ip6->ip6_hlim != 255) {
2195 nd6log((LOG_ERR,
2196 "ICMP6 redirect sent from %s rejected; "
2197 "hlim=%d (must be 255)\n",
2198 ip6_sprintf(&src6), ip6->ip6_hlim));
2199 goto bad;
2200 }
2201 {
2202 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2203 struct sockaddr_in6 sin6;
2204 struct in6_addr *gw6;
2205
2206 bzero(&sin6, sizeof(sin6));
2207 sin6.sin6_family = AF_INET6;
2208 sin6.sin6_len = sizeof(struct sockaddr_in6);
2209 bcopy(&reddst6, &sin6.sin6_addr, sizeof reddst6);
2210 rt = rtpurelookup((struct sockaddr *)&sin6);
2211 if (rt != NULL) {
2212 if (rt->rt_gateway == NULL ||
2213 rt->rt_gateway->sa_family != AF_INET6) {
2214 nd6log((LOG_ERR,
2215 "ICMP6 redirect rejected; no route "
2216 "with inet6 gateway found for redirect dst: %s\n",
2217 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2218 --rt->rt_refcnt;
2219 goto bad;
2220 }
2221
2222 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2223 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2224 nd6log((LOG_ERR,
2225 "ICMP6 redirect rejected; "
2226 "not equal to gw-for-src=%s (must be same): "
2227 "%s\n",
2228 ip6_sprintf(gw6),
2229 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2230 --rt->rt_refcnt;
2231 goto bad;
2232 }
2233 } else {
2234 nd6log((LOG_ERR,
2235 "ICMP6 redirect rejected; "
2236 "no route found for redirect dst: %s\n",
2237 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2238 goto bad;
2239 }
2240 --rt->rt_refcnt;
2241 rt = NULL;
2242 }
2243 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2244 nd6log((LOG_ERR,
2245 "ICMP6 redirect rejected; "
2246 "redirect dst must be unicast: %s\n",
2247 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2248 goto bad;
2249 }
2250
2251 is_router = is_onlink = 0;
2252 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2253 is_router = 1; /* router case */
2254 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2255 is_onlink = 1; /* on-link destination case */
2256 if (!is_router && !is_onlink) {
2257 nd6log((LOG_ERR,
2258 "ICMP6 redirect rejected; "
2259 "neither router case nor onlink case: %s\n",
2260 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2261 goto bad;
2262 }
2263 /* validation passed */
2264
2265 icmp6len -= sizeof(*nd_rd);
2266 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2267 if (nd6_options(&ndopts) < 0) {
2268 nd6log((LOG_INFO, "icmp6_redirect_input: "
2269 "invalid ND option, rejected: %s\n",
2270 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2271 /* nd6_options have incremented stats */
2272 goto freeit;
2273 }
2274
2275 if (ndopts.nd_opts_tgt_lladdr) {
2276 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2277 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2278 }
2279
2280 #if 0
2281 if (ndopts.nd_opts_rh) {
2282 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2283 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2284 }
2285 #endif
2286
2287 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2288 nd6log((LOG_INFO,
2289 "icmp6_redirect_input: lladdrlen mismatch for %s "
2290 "(if %d, icmp6 packet %d): %s\n",
2291 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
2292 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2293 goto bad;
2294 }
2295
2296 /* RFC 2461 8.3 */
2297 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2298 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2299
2300 if (!is_onlink) { /* better router case. perform rtredirect. */
2301 /* perform rtredirect */
2302 struct sockaddr_in6 sdst;
2303 struct sockaddr_in6 sgw;
2304 struct sockaddr_in6 ssrc;
2305
2306 bzero(&sdst, sizeof(sdst));
2307 bzero(&sgw, sizeof(sgw));
2308 bzero(&ssrc, sizeof(ssrc));
2309 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2310 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2311 sizeof(struct sockaddr_in6);
2312 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2313 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2314 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2315 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
2316 NULL, RTF_GATEWAY | RTF_HOST,
2317 (struct sockaddr *)&ssrc);
2318 }
2319 /* finally update cached route in each socket via kpfctlinput */
2320 {
2321 struct sockaddr_in6 sdst;
2322
2323 bzero(&sdst, sizeof(sdst));
2324 sdst.sin6_family = AF_INET6;
2325 sdst.sin6_len = sizeof(struct sockaddr_in6);
2326 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2327 kpfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2328 #ifdef IPSEC
2329 key_sa_routechange((struct sockaddr *)&sdst);
2330 #endif
2331 }
2332
2333 freeit:
2334 m_freem(m);
2335 return;
2336
2337 bad:
2338 icmp6stat.icp6s_badredirect++;
2339 m_freem(m);
2340 }
2341
2342 void
2343 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
2344 {
2345 struct ifnet *ifp; /* my outgoing interface */
2346 struct in6_addr *ifp_ll6;
2347 struct in6_addr *router_ll6;
2348 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2349 struct mbuf *m = NULL; /* newly allocated one */
2350 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2351 struct nd_redirect *nd_rd;
2352 size_t maxlen;
2353 u_char *p;
2354 struct ifnet *outif = NULL;
2355 struct sockaddr_in6 src_sa;
2356
2357 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2358
2359 /* if we are not router, we don't send icmp6 redirect */
2360 if (!ip6_forwarding || ip6_accept_rtadv)
2361 goto fail;
2362
2363 /* sanity check */
2364 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2365 goto fail;
2366
2367 /*
2368 * Address check:
2369 * the source address must identify a neighbor, and
2370 * the destination address must not be a multicast address
2371 * [RFC 2461, sec 8.2]
2372 */
2373 sip6 = mtod(m0, struct ip6_hdr *);
2374 bzero(&src_sa, sizeof(src_sa));
2375 src_sa.sin6_family = AF_INET6;
2376 src_sa.sin6_len = sizeof(src_sa);
2377 src_sa.sin6_addr = sip6->ip6_src;
2378 /* we don't currently use sin6_scope_id, but eventually use it */
2379 if (in6_addr2zoneid(ifp, &sip6->ip6_src, &src_sa.sin6_scope_id))
2380 goto fail;
2381 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2382 goto fail;
2383 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2384 goto fail; /* what should we do here? */
2385
2386 /* rate limit */
2387 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2388 goto fail;
2389
2390 /*
2391 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2392 * we almost always ask for an mbuf cluster for simplicity.
2393 * (MHLEN < IPV6_MMTU is almost always true)
2394 */
2395 #if IPV6_MMTU >= MCLBYTES
2396 # error assumption failed about IPV6_MMTU and MCLBYTES
2397 #endif
2398 m = m_getb(IPV6_MMTU, M_NOWAIT, MT_HEADER, M_PKTHDR);
2399 if (!m)
2400 goto fail;
2401 m->m_len = 0;
2402 maxlen = M_TRAILINGSPACE(m);
2403 maxlen = min(IPV6_MMTU, maxlen);
2404 /* just for safety */
2405 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2406 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2407 goto fail;
2408 }
2409
2410 {
2411 /* get ip6 linklocal address for ifp(my outgoing interface). */
2412 struct in6_ifaddr *ia;
2413 if ((ia = in6ifa_ifpforlinklocal(ifp,
2414 IN6_IFF_NOTREADY|
2415 IN6_IFF_ANYCAST)) == NULL)
2416 goto fail;
2417 ifp_ll6 = &ia->ia_addr.sin6_addr;
2418 }
2419
2420 /* get ip6 linklocal address for the router. */
2421 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2422 struct sockaddr_in6 *sin6;
2423 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2424 router_ll6 = &sin6->sin6_addr;
2425 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2426 router_ll6 = NULL;
2427 } else
2428 router_ll6 = NULL;
2429
2430 /* ip6 */
2431 ip6 = mtod(m, struct ip6_hdr *);
2432 ip6->ip6_flow = 0;
2433 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2434 ip6->ip6_vfc |= IPV6_VERSION;
2435 /* ip6->ip6_plen will be set later */
2436 ip6->ip6_nxt = IPPROTO_ICMPV6;
2437 ip6->ip6_hlim = 255;
2438 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2439 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2440 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2441
2442 /* ND Redirect */
2443 nd_rd = (struct nd_redirect *)(ip6 + 1);
2444 nd_rd->nd_rd_type = ND_REDIRECT;
2445 nd_rd->nd_rd_code = 0;
2446 nd_rd->nd_rd_reserved = 0;
2447 if (rt->rt_flags & RTF_GATEWAY) {
2448 /*
2449 * nd_rd->nd_rd_target must be a link-local address in
2450 * better router cases.
2451 */
2452 if (!router_ll6)
2453 goto fail;
2454 bcopy(router_ll6, &nd_rd->nd_rd_target,
2455 sizeof(nd_rd->nd_rd_target));
2456 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2457 sizeof(nd_rd->nd_rd_dst));
2458 } else {
2459 /* make sure redtgt == reddst */
2460 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2461 sizeof(nd_rd->nd_rd_target));
2462 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2463 sizeof(nd_rd->nd_rd_dst));
2464 }
2465
2466 p = (u_char *)(nd_rd + 1);
2467
2468 if (!router_ll6)
2469 goto nolladdropt;
2470
2471 {
2472 /* target lladdr option */
2473 struct rtentry *rt_router = NULL;
2474 int len;
2475 struct sockaddr_dl *sdl;
2476 struct nd_opt_hdr *nd_opt;
2477 char *lladdr;
2478
2479 rt_router = nd6_lookup(router_ll6, 0, ifp);
2480 if (!rt_router)
2481 goto nolladdropt;
2482 len = sizeof(*nd_opt) + ifp->if_addrlen;
2483 len = (len + 7) & ~7; /* round by 8 */
2484 /* safety check */
2485 if (len + (p - (u_char *)ip6) > maxlen)
2486 goto nolladdropt;
2487 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2488 (rt_router->rt_flags & RTF_LLINFO) &&
2489 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2490 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
2491 sdl->sdl_alen) {
2492 nd_opt = (struct nd_opt_hdr *)p;
2493 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2494 nd_opt->nd_opt_len = len >> 3;
2495 lladdr = (char *)(nd_opt + 1);
2496 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2497 p += len;
2498 }
2499 }
2500 nolladdropt:;
2501
2502 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2503
2504 /* just to be safe */
2505 #ifdef M_DECRYPTED /*not openbsd*/
2506 if (m0->m_flags & M_DECRYPTED)
2507 goto noredhdropt;
2508 #endif
2509 if (p - (u_char *)ip6 > maxlen)
2510 goto noredhdropt;
2511
2512 {
2513 /* redirected header option */
2514 int len;
2515 struct nd_opt_rd_hdr *nd_opt_rh;
2516
2517 /*
2518 * compute the maximum size for icmp6 redirect header option.
2519 * XXX room for auth header?
2520 */
2521 len = maxlen - (p - (u_char *)ip6);
2522 len &= ~7;
2523
2524 /* This is just for simplicity. */
2525 if (m0->m_pkthdr.len != m0->m_len) {
2526 if (m0->m_next) {
2527 m_freem(m0->m_next);
2528 m0->m_next = NULL;
2529 }
2530 m0->m_pkthdr.len = m0->m_len;
2531 }
2532
2533 /*
2534 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2535 * about padding/truncate rule for the original IP packet.
2536 * From the discussion on IPv6imp in Feb 1999, the consensus was:
2537 * - "attach as much as possible" is the goal
2538 * - pad if not aligned (original size can be guessed by original
2539 * ip6 header)
2540 * Following code adds the padding if it is simple enough,
2541 * and truncates if not.
2542 */
2543 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2544 panic("assumption failed in %s:%d", __FILE__, __LINE__);
2545
2546 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2547 /* not enough room, truncate */
2548 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2549 } else {
2550 /* enough room, pad or truncate */
2551 size_t extra;
2552
2553 extra = m0->m_pkthdr.len % 8;
2554 if (extra) {
2555 /* pad if easy enough, truncate if not */
2556 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2557 /* pad */
2558 m0->m_len += (8 - extra);
2559 m0->m_pkthdr.len += (8 - extra);
2560 } else {
2561 /* truncate */
2562 m0->m_pkthdr.len -= extra;
2563 m0->m_len -= extra;
2564 }
2565 }
2566 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2567 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2568 }
2569
2570 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2571 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2572 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2573 nd_opt_rh->nd_opt_rh_len = len >> 3;
2574 p += sizeof(*nd_opt_rh);
2575 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2576
2577 /* connect m0 to m */
2578 m->m_next = m0;
2579 m->m_pkthdr.len = m->m_len + m0->m_len;
2580 m0 = NULL;
2581 }
2582 noredhdropt:;
2583 if (m0 != NULL) {
2584 m_freem(m0);
2585 m0 = NULL;
2586 }
2587
2588 /* XXX: clear embedded link IDs in the inner header */
2589 in6_clearscope(&sip6->ip6_src);
2590 in6_clearscope(&sip6->ip6_dst);
2591 in6_clearscope(&nd_rd->nd_rd_target);
2592 in6_clearscope(&nd_rd->nd_rd_dst);
2593
2594 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2595
2596 nd_rd->nd_rd_cksum = 0;
2597 nd_rd->nd_rd_cksum
2598 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2599
2600 /* send the packet to outside... */
2601 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2602 if (outif) {
2603 icmp6_ifstat_inc(outif, ifs6_out_msg);
2604 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2605 }
2606 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2607
2608 return;
2609
2610 fail:
2611 if (m)
2612 m_freem(m);
2613 if (m0)
2614 m_freem(m0);
2615 }
2616
2617 #ifdef HAVE_NRL_INPCB
2618 #define in6pcb inpcb
2619 #define in6p_icmp6filt inp_icmp6filt
2620 #endif
2621 /*
2622 * ICMPv6 socket option processing.
2623 */
2624 void
2625 icmp6_ctloutput(netmsg_t msg)
2626 {
2627 struct socket *so = msg->ctloutput.base.nm_so;
2628 struct sockopt *sopt = msg->ctloutput.nm_sopt;
2629 int error = 0;
2630 int optlen;
2631 struct inpcb *inp = so->so_pcb;
2632 int level, op, optname;
2633
2634 if (sopt) {
2635 level = sopt->sopt_level;
2636 op = sopt->sopt_dir;
2637 optname = sopt->sopt_name;
2638 optlen = sopt->sopt_valsize;
2639 } else
2640 level = op = optname = optlen = 0;
2641
2642 if (level != IPPROTO_ICMPV6) {
2643 error = EINVAL;
2644 goto out;
2645 }
2646
2647 switch (op) {
2648 case PRCO_SETOPT:
2649 switch (optname) {
2650 case ICMP6_FILTER:
2651 {
2652 if (optlen != sizeof(struct icmp6_filter)) {
2653 error = EMSGSIZE;
2654 break;
2655 }
2656 if (inp->in6p_icmp6filt == NULL) {
2657 error = EINVAL;
2658 break;
2659 }
2660 error = soopt_to_kbuf(sopt, inp->in6p_icmp6filt, optlen,
2661 optlen);
2662 break;
2663 }
2664
2665 default:
2666 error = ENOPROTOOPT;
2667 break;
2668 }
2669 break;
2670
2671 case PRCO_GETOPT:
2672 switch (optname) {
2673 case ICMP6_FILTER:
2674 {
2675 if (inp->in6p_icmp6filt == NULL) {
2676 error = EINVAL;
2677 break;
2678 }
2679 soopt_from_kbuf(sopt, inp->in6p_icmp6filt,
2680 sizeof(struct icmp6_filter));
2681 break;
2682 }
2683
2684 default:
2685 error = ENOPROTOOPT;
2686 break;
2687 }
2688 break;
2689 }
2690 out:
2691 lwkt_replymsg(&msg->ctloutput.base.lmsg, error);
2692 }
2693 #ifdef HAVE_NRL_INPCB
2694 #undef in6pcb
2695 #undef in6p_icmp6filt
2696 #endif
2697
2698 #ifndef HAVE_PPSRATECHECK
2699 #ifndef timersub
2700 #define timersub(tvp, uvp, vvp) \
2701 do { \
2702 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
2703 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
2704 if ((vvp)->tv_usec < 0) { \
2705 (vvp)->tv_sec--; \
2706 (vvp)->tv_usec += 1000000; \
2707 } \
2708 } while (0)
2709 #endif
2710
2711 /*
2712 * ppsratecheck(): packets (or events) per second limitation.
2713 */
2714 static int
2715 ppsratecheck(struct timeval *lasttime, int *curpps,
2716 int maxpps) /* maximum pps allowed */
2717 {
2718 struct timeval tv, delta;
2719 int rv;
2720
2721 microtime(&tv);
2722
2723 timersub(&tv, lasttime, &delta);
2724
2725 /*
2726 * Check for 0,0 so that the message will be seen at least once.
2727 * If more than one second has passed since the last update of
2728 * lasttime, reset the counter.
2729 *
2730 * We do increment *curpps even in *curpps < maxpps case, as some may
2731 * try to use *curpps for stat purposes as well.
2732 */
2733 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
2734 delta.tv_sec >= 1) {
2735 *lasttime = tv;
2736 *curpps = 0;
2737 rv = 1;
2738 } else if (maxpps < 0)
2739 rv = 1;
2740 else if (*curpps < maxpps)
2741 rv = 1;
2742 else
2743 rv = 0;
2744
2745 #if 1 /* DIAGNOSTIC? */
2746 /* be careful about wrap-around */
2747 if (*curpps + 1 > *curpps)
2748 *curpps = *curpps + 1;
2749 #else
2750 /*
2751 * assume that there's not too many calls to this function.
2752 * not sure if the assumption holds, as it depends on *caller's*
2753 * behavior, not the behavior of this function.
2754 * IMHO it is wrong to make assumption on the caller's behavior,
2755 * so the above #if is #if 1, not #ifdef DIAGNOSTIC.
2756 */
2757 *curpps = *curpps + 1;
2758 #endif
2759
2760 return (rv);
2761 }
2762 #endif
2763
2764 /*
2765 * Perform rate limit check.
2766 * Returns 0 if it is okay to send the icmp6 packet.
2767 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2768 * limitation.
2769 *
2770 * XXX per-destination/type check necessary?
2771 */
2772 static int
2773 icmp6_ratelimit(const struct in6_addr *dst, /* not used at this moment */
2774 const int type, /* not used at this moment */
2775 const int code) /* not used at this moment */
2776 {
2777 int ret;
2778
2779 ret = 0; /* okay to send */
2780
2781 /* PPS limit */
2782 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2783 icmp6errppslim)) {
2784 /* The packet is subject to rate limit */
2785 ret++;
2786 }
2787
2788 return ret;
2789 }
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