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microuptime.9 microtime.9: Fix documentation of the get* function versions.
[dragonfly.git] / sys / netinet6 / icmp6.c
blob66688564ac583bfe79bcdbda5ccee799960a18b4
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 #include <net/netisr2.h>
89 #include <net/netmsg2.h>
90
91 #include <netinet/in.h>
92 #include <netinet/in_var.h>
93 #include <netinet/ip6.h>
94 #include <netinet6/ip6_var.h>
95 #include <netinet/icmp6.h>
96 #include <netinet6/mld6_var.h>
97 #include <netinet/in_pcb.h>
98 #include <netinet6/in6_pcb.h>
99 #include <netinet6/nd6.h>
100 #include <netinet6/in6_ifattach.h>
101 #include <netinet6/ip6protosw.h>
102
103 #ifdef IPSEC
104 #include <netinet6/ipsec.h>
105 #include <netproto/key/key.h>
106 #endif
107
108 #ifdef FAST_IPSEC
109 #include <netproto/ipsec/ipsec.h>
110 #include <netproto/ipsec/key.h>
111 #define IPSEC
112 #endif
113
114 #include <net/net_osdep.h>
115
116 #ifdef HAVE_NRL_INPCB
117 /* inpcb members */
118 #define in6pcb inpcb
119 #define in6p_laddr inp_laddr6
120 #define in6p_faddr inp_faddr6
121 #define in6p_icmp6filt inp_icmp6filt
122 #define in6p_route inp_route
123 #define in6p_socket inp_socket
124 #define in6p_flags inp_flags
125 #define in6p_moptions inp_moptions6
126 #define in6p_outputopts inp_outputopts6
127 #define in6p_ip6 inp_ipv6
128 #define in6p_flowinfo inp_flowinfo
129 #define in6p_sp inp_sp
130 #define in6p_next inp_next
131 #define in6p_prev inp_prev
132 /* function names */
133 #define in6_pcbdetach in_pcbdetach
134 #define in6_rtchange in_rtchange
135
136 /*
137 * for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from
138 * others...
139 */
140 #define in6p_ip6_nxt inp_ipv6.ip6_nxt
141 #endif
142
143 #define ICMP6_FASTTIMO (hz / PR_FASTHZ)
144
145 /*
146 * ppratecheck() is available, so define it here.
147 */
148 #define HAVE_PPSRATECHECK
149
150 extern struct domain inet6domain;
151 extern struct protosw inet6sw[];
152 extern u_char ip6_protox[];
153
154 struct icmp6stat icmp6stat;
155
156 extern struct inpcbinfo ripcbinfo;
157 extern int icmp6errppslim;
158 static int icmp6errpps_count = 0;
159 static struct timeval icmp6errppslim_last;
160 extern int icmp6_nodeinfo;
161
162 static void icmp6_errcount (struct icmp6errstat *, int, int);
163 static int icmp6_rip6_input (struct mbuf **, int);
164 static int icmp6_ratelimit (const struct in6_addr *, const int, const int);
165 static const char *icmp6_redirect_diag (struct in6_addr *,
166 struct in6_addr *, struct in6_addr *);
167 #ifndef HAVE_PPSRATECHECK
168 static int ppsratecheck (struct timeval *, int *, int);
169 #endif
170 static struct mbuf *ni6_input (struct mbuf *, int);
171 static struct mbuf *ni6_nametodns (const char *, int, int);
172 static int ni6_dnsmatch (const char *, int, const char *, int);
173 static int ni6_addrs (struct icmp6_nodeinfo *, struct mbuf *,
174 struct ifnet **, char *);
175 static int ni6_store_addrs (struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
176 struct ifnet *, int);
177 static int icmp6_notify_error (struct mbuf *, int, int, int);
178
179 static void icmp6_fasttimo(void *);
180 static void icmp6_fasttimo_dispatch(netmsg_t);
181
182 #ifdef COMPAT_RFC1885
183 static struct route_in6 icmp6_reflect_rt;
184 #endif
185
186 static struct callout icmp6_fasttimo_ch;
187 static struct netmsg_base icmp6_fasttimo_nmsg;
188
189 void
190 icmp6_init(void)
191 {
192
193 mld6_init();
194
195 callout_init_mp(&icmp6_fasttimo_ch);
196 netmsg_init(&icmp6_fasttimo_nmsg, NULL, &netisr_adone_rport,
197 MSGF_PRIORITY, icmp6_fasttimo_dispatch);
198
199 callout_reset_bycpu(&icmp6_fasttimo_ch, ICMP6_FASTTIMO,
200 icmp6_fasttimo, NULL, 0);
201 }
202
203 static void
204 icmp6_errcount(struct icmp6errstat *stat, int type, int code)
205 {
206 switch (type) {
207 case ICMP6_DST_UNREACH:
208 switch (code) {
209 case ICMP6_DST_UNREACH_NOROUTE:
210 stat->icp6errs_dst_unreach_noroute++;
211 return;
212 case ICMP6_DST_UNREACH_ADMIN:
213 stat->icp6errs_dst_unreach_admin++;
214 return;
215 case ICMP6_DST_UNREACH_BEYONDSCOPE:
216 stat->icp6errs_dst_unreach_beyondscope++;
217 return;
218 case ICMP6_DST_UNREACH_ADDR:
219 stat->icp6errs_dst_unreach_addr++;
220 return;
221 case ICMP6_DST_UNREACH_NOPORT:
222 stat->icp6errs_dst_unreach_noport++;
223 return;
224 }
225 break;
226 case ICMP6_PACKET_TOO_BIG:
227 stat->icp6errs_packet_too_big++;
228 return;
229 case ICMP6_TIME_EXCEEDED:
230 switch (code) {
231 case ICMP6_TIME_EXCEED_TRANSIT:
232 stat->icp6errs_time_exceed_transit++;
233 return;
234 case ICMP6_TIME_EXCEED_REASSEMBLY:
235 stat->icp6errs_time_exceed_reassembly++;
236 return;
237 }
238 break;
239 case ICMP6_PARAM_PROB:
240 switch (code) {
241 case ICMP6_PARAMPROB_HEADER:
242 stat->icp6errs_paramprob_header++;
243 return;
244 case ICMP6_PARAMPROB_NEXTHEADER:
245 stat->icp6errs_paramprob_nextheader++;
246 return;
247 case ICMP6_PARAMPROB_OPTION:
248 stat->icp6errs_paramprob_option++;
249 return;
250 }
251 break;
252 case ND_REDIRECT:
253 stat->icp6errs_redirect++;
254 return;
255 }
256 stat->icp6errs_unknown++;
257 }
258
259 /*
260 * Generate an error packet of type error in response to bad IP6 packet.
261 */
262 void
263 icmp6_error(struct mbuf *m, int type, int code, int param)
264 {
265 struct ip6_hdr *oip6, *nip6;
266 struct icmp6_hdr *icmp6;
267 u_int preplen;
268 int off;
269 int nxt;
270
271 icmp6stat.icp6s_error++;
272
273 /* count per-type-code statistics */
274 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
275
276 #ifdef M_DECRYPTED /*not openbsd*/
277 if (m->m_flags & M_DECRYPTED) {
278 icmp6stat.icp6s_canterror++;
279 goto freeit;
280 }
281 #endif
282
283 #ifndef PULLDOWN_TEST
284 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
285 #else
286 if (m->m_len < sizeof(struct ip6_hdr)) {
287 m = m_pullup(m, sizeof(struct ip6_hdr));
288 if (m == NULL)
289 return;
290 }
291 #endif
292 oip6 = mtod(m, struct ip6_hdr *);
293
294 /*
295 * Multicast destination check. For unrecognized option errors,
296 * this check has already done in ip6_unknown_opt(), so we can
297 * check only for other errors.
298 */
299 if ((m->m_flags & (M_BCAST|M_MCAST) ||
300 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
301 (type != ICMP6_PACKET_TOO_BIG &&
302 (type != ICMP6_PARAM_PROB ||
303 code != ICMP6_PARAMPROB_OPTION)))
304 goto freeit;
305
306 /* Source address check. XXX: the case of anycast source? */
307 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
308 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
309 goto freeit;
310
311 /*
312 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
313 * don't do it.
314 */
315 nxt = -1;
316 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
317 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
318 struct icmp6_hdr *icp;
319
320 #ifndef PULLDOWN_TEST
321 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
322 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
323 #else
324 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
325 sizeof(*icp));
326 if (icp == NULL) {
327 icmp6stat.icp6s_tooshort++;
328 return;
329 }
330 #endif
331 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
332 icp->icmp6_type == ND_REDIRECT) {
333 /*
334 * ICMPv6 error
335 * Special case: for redirect (which is
336 * informational) we must not send icmp6 error.
337 */
338 icmp6stat.icp6s_canterror++;
339 goto freeit;
340 } else {
341 /* ICMPv6 informational - send the error */
342 }
343 } else {
344 /* non-ICMPv6 - send the error */
345 }
346
347 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
348
349 /* Finally, do rate limitation check. */
350 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
351 icmp6stat.icp6s_toofreq++;
352 goto freeit;
353 }
354
355 /*
356 * OK, ICMP6 can be generated.
357 */
358
359 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
360 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
361
362 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
363 M_PREPEND(m, preplen, M_NOWAIT);
364 if (m && m->m_len < preplen)
365 m = m_pullup(m, preplen);
366 if (m == NULL) {
367 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
368 return;
369 }
370
371 nip6 = mtod(m, struct ip6_hdr *);
372 nip6->ip6_src = oip6->ip6_src;
373 nip6->ip6_dst = oip6->ip6_dst;
374
375 in6_clearscope(&oip6->ip6_src);
376 in6_clearscope(&oip6->ip6_dst);
377
378 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
379 icmp6->icmp6_type = type;
380 icmp6->icmp6_code = code;
381 icmp6->icmp6_pptr = htonl((u_int32_t)param);
382
383 /*
384 * icmp6_reflect() is designed to be in the input path.
385 * icmp6_error() can be called from both input and outut path,
386 * and if we are in output path rcvif could contain bogus value.
387 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
388 * information in ip header (nip6).
389 */
390 m->m_pkthdr.rcvif = NULL;
391
392 icmp6stat.icp6s_outhist[type]++;
393 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
394
395 return;
396
397 freeit:
398 /*
399 * If we can't tell wheter or not we can generate ICMP6, free it.
400 */
401 m_freem(m);
402 }
403
404 /*
405 * Process a received ICMP6 message.
406 */
407 int
408 icmp6_input(struct mbuf **mp, int *offp, int proto)
409 {
410 struct mbuf *m = *mp, *n;
411 struct ip6_hdr *ip6, *nip6;
412 struct icmp6_hdr *icmp6, *nicmp6;
413 int off = *offp;
414 int icmp6len = m->m_pkthdr.len - *offp;
415 int code, sum, noff;
416
417 #ifndef PULLDOWN_TEST
418 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
419 /* m might change if M_LOOP. So, call mtod after this */
420 #endif
421
422 /*
423 * Locate icmp6 structure in mbuf, and check
424 * that not corrupted and of at least minimum length
425 */
426
427 ip6 = mtod(m, struct ip6_hdr *);
428 if (icmp6len < sizeof(struct icmp6_hdr)) {
429 icmp6stat.icp6s_tooshort++;
430 goto freeit;
431 }
432
433 /*
434 * calculate the checksum
435 */
436 #ifndef PULLDOWN_TEST
437 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
438 #else
439 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
440 if (icmp6 == NULL) {
441 icmp6stat.icp6s_tooshort++;
442 return IPPROTO_DONE;
443 }
444 #endif
445 code = icmp6->icmp6_code;
446
447 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
448 nd6log((LOG_ERR,
449 "ICMP6 checksum error(%d|%x) %s\n",
450 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
451 icmp6stat.icp6s_checksum++;
452 goto freeit;
453 }
454
455 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
456 /*
457 * Deliver very specific ICMP6 type only.
458 * This is important to deilver TOOBIG. Otherwise PMTUD
459 * will not work.
460 */
461 switch (icmp6->icmp6_type) {
462 case ICMP6_DST_UNREACH:
463 case ICMP6_PACKET_TOO_BIG:
464 case ICMP6_TIME_EXCEEDED:
465 break;
466 default:
467 goto freeit;
468 }
469 }
470
471 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
472 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
473 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
474 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
475
476 switch (icmp6->icmp6_type) {
477 case ICMP6_DST_UNREACH:
478 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
479 switch (code) {
480 case ICMP6_DST_UNREACH_NOROUTE:
481 code = PRC_UNREACH_NET;
482 break;
483 case ICMP6_DST_UNREACH_ADMIN:
484 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
485 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
486 break;
487 case ICMP6_DST_UNREACH_ADDR:
488 code = PRC_HOSTDEAD;
489 break;
490 #ifdef COMPAT_RFC1885
491 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
492 code = PRC_UNREACH_SRCFAIL;
493 break;
494 #else
495 case ICMP6_DST_UNREACH_BEYONDSCOPE:
496 /* I mean "source address was incorrect." */
497 code = PRC_PARAMPROB;
498 break;
499 #endif
500 case ICMP6_DST_UNREACH_NOPORT:
501 code = PRC_UNREACH_PORT;
502 break;
503 default:
504 goto badcode;
505 }
506 goto deliver;
507 break;
508
509 case ICMP6_PACKET_TOO_BIG:
510 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
511 if (code != 0)
512 goto badcode;
513
514 code = PRC_MSGSIZE;
515
516 /*
517 * Updating the path MTU will be done after examining
518 * intermediate extension headers.
519 */
520 goto deliver;
521 break;
522
523 case ICMP6_TIME_EXCEEDED:
524 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
525 switch (code) {
526 case ICMP6_TIME_EXCEED_TRANSIT:
527 case ICMP6_TIME_EXCEED_REASSEMBLY:
528 code += PRC_TIMXCEED_INTRANS;
529 break;
530 default:
531 goto badcode;
532 }
533 goto deliver;
534 break;
535
536 case ICMP6_PARAM_PROB:
537 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
538 switch (code) {
539 case ICMP6_PARAMPROB_NEXTHEADER:
540 code = PRC_UNREACH_PROTOCOL;
541 break;
542 case ICMP6_PARAMPROB_HEADER:
543 case ICMP6_PARAMPROB_OPTION:
544 code = PRC_PARAMPROB;
545 break;
546 default:
547 goto badcode;
548 }
549 goto deliver;
550 break;
551
552 case ICMP6_ECHO_REQUEST:
553 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
554 if (code != 0)
555 goto badcode;
556 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
557 /* Give up remote */
558 break;
559 }
560 if ((n->m_flags & M_EXT) ||
561 n->m_len < off + sizeof(struct icmp6_hdr)) {
562 struct mbuf *n0 = n;
563 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
564 int n0len;
565
566 /*
567 * Prepare an internal mbuf. m_pullup() doesn't
568 * always copy the length we specified.
569 */
570 if (maxlen >= MCLBYTES) {
571 /* Give up remote */
572 m_freem(n0);
573 break;
574 }
575 n = m_getb(maxlen, M_NOWAIT, n0->m_type, M_PKTHDR);
576 if (n == NULL) {
577 /* Give up remote */
578 m_freem(n0);
579 break;
580 }
581 n0len = n0->m_pkthdr.len; /* save for use below */
582 M_MOVE_PKTHDR(n, n0);
583 /*
584 * Copy IPv6 and ICMPv6 only.
585 */
586 nip6 = mtod(n, struct ip6_hdr *);
587 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
588 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
589 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
590 noff = sizeof(struct ip6_hdr);
591 /* new mbuf contains only ipv6+icmpv6 headers */
592 n->m_len = noff + sizeof(struct icmp6_hdr);
593 /*
594 * Adjust mbuf. ip6_plen will be adjusted in
595 * ip6_output().
596 */
597 m_adj(n0, off + sizeof(struct icmp6_hdr));
598 /* recalculate complete packet size */
599 n->m_pkthdr.len = n0len + (noff - off);
600 n->m_next = n0;
601 } else {
602 nip6 = mtod(n, struct ip6_hdr *);
603 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off);
604 noff = off;
605 }
606 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
607 nicmp6->icmp6_code = 0;
608 if (n) {
609 icmp6stat.icp6s_reflect++;
610 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
611 icmp6_reflect(n, noff);
612 }
613 break;
614
615 case ICMP6_ECHO_REPLY:
616 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
617 if (code != 0)
618 goto badcode;
619 break;
620
621 case MLD_LISTENER_QUERY:
622 case MLD_LISTENER_REPORT:
623 if (icmp6len < sizeof(struct mld_hdr))
624 goto badlen;
625 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
626 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
627 else
628 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
629 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
630 /* give up local */
631 mld6_input(m, off);
632 m = NULL;
633 goto freeit;
634 }
635 mld6_input(n, off);
636 /* m stays. */
637 break;
638
639 case MLD_LISTENER_DONE:
640 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
641 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
642 goto badlen;
643 break; /* nothing to be done in kernel */
644
645 case MLD_MTRACE_RESP:
646 case MLD_MTRACE:
647 /* XXX: these two are experimental. not officially defind. */
648 /* XXX: per-interface statistics? */
649 break; /* just pass it to applications */
650
651 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
652 {
653 enum { WRU, FQDN } mode;
654
655 if (!icmp6_nodeinfo)
656 break;
657
658 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
659 mode = WRU;
660 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
661 mode = FQDN;
662 else
663 goto badlen;
664
665 #define hostnamelen strlen(hostname)
666 if (mode == FQDN) {
667 #ifndef PULLDOWN_TEST
668 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
669 IPPROTO_DONE);
670 #endif
671 n = m_copy(m, 0, M_COPYALL);
672 if (n)
673 n = ni6_input(n, off);
674 /* XXX meaningless if n == NULL */
675 noff = sizeof(struct ip6_hdr);
676 } else {
677 u_char *p;
678 int maxlen, maxhlen;
679
680 if ((icmp6_nodeinfo & 5) != 5)
681 break;
682
683 if (code != 0)
684 goto badcode;
685 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
686 if (maxlen >= MCLBYTES) {
687 /* Give up remote */
688 break;
689 }
690 n = m_getb(maxlen, M_NOWAIT, m->m_type, M_PKTHDR);
691 if (n == NULL) {
692 /* Give up remote */
693 break;
694 }
695 if (!m_dup_pkthdr(n, m, M_NOWAIT)) {
696 /*
697 * Previous code did a blind M_COPY_PKTHDR
698 * and said "just for rcvif". If true, then
699 * we could tolerate the dup failing (due to
700 * the deep copy of the tag chain). For now
701 * be conservative and just fail.
702 */
703 m_free(n);
704 break;
705 }
706 n->m_len = 0;
707 maxhlen = M_TRAILINGSPACE(n) - maxlen;
708 if (maxhlen > hostnamelen)
709 maxhlen = hostnamelen;
710 /*
711 * Copy IPv6 and ICMPv6 only.
712 */
713 nip6 = mtod(n, struct ip6_hdr *);
714 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
715 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
716 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
717 p = (u_char *)(nicmp6 + 1);
718 bzero(p, 4);
719 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
720 noff = sizeof(struct ip6_hdr);
721 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
722 sizeof(struct icmp6_hdr) + 4 + maxhlen;
723 nicmp6->icmp6_type = ICMP6_WRUREPLY;
724 nicmp6->icmp6_code = 0;
725 }
726 #undef hostnamelen
727 if (n) {
728 icmp6stat.icp6s_reflect++;
729 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
730 icmp6_reflect(n, noff);
731 }
732 break;
733 }
734
735 case ICMP6_WRUREPLY:
736 if (code != 0)
737 goto badcode;
738 break;
739
740 case ND_ROUTER_SOLICIT:
741 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
742 if (code != 0)
743 goto badcode;
744 if (icmp6len < sizeof(struct nd_router_solicit))
745 goto badlen;
746 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
747 /* give up local */
748 nd6_rs_input(m, off, icmp6len);
749 m = NULL;
750 goto freeit;
751 }
752 nd6_rs_input(n, off, icmp6len);
753 /* m stays. */
754 break;
755
756 case ND_ROUTER_ADVERT:
757 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
758 if (code != 0)
759 goto badcode;
760 if (icmp6len < sizeof(struct nd_router_advert))
761 goto badlen;
762 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
763 /* give up local */
764 nd6_ra_input(m, off, icmp6len);
765 m = NULL;
766 goto freeit;
767 }
768 nd6_ra_input(n, off, icmp6len);
769 /* m stays. */
770 break;
771
772 case ND_NEIGHBOR_SOLICIT:
773 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
774 if (code != 0)
775 goto badcode;
776 if (icmp6len < sizeof(struct nd_neighbor_solicit))
777 goto badlen;
778 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
779 /* give up local */
780 nd6_ns_input(m, off, icmp6len);
781 m = NULL;
782 goto freeit;
783 }
784 nd6_ns_input(n, off, icmp6len);
785 /* m stays. */
786 break;
787
788 case ND_NEIGHBOR_ADVERT:
789 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
790 if (code != 0)
791 goto badcode;
792 if (icmp6len < sizeof(struct nd_neighbor_advert))
793 goto badlen;
794 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
795 /* give up local */
796 nd6_na_input(m, off, icmp6len);
797 m = NULL;
798 goto freeit;
799 }
800 nd6_na_input(n, off, icmp6len);
801 /* m stays. */
802 break;
803
804 case ND_REDIRECT:
805 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
806 if (code != 0)
807 goto badcode;
808 if (icmp6len < sizeof(struct nd_redirect))
809 goto badlen;
810 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
811 /* give up local */
812 icmp6_redirect_input(m, off);
813 m = NULL;
814 goto freeit;
815 }
816 icmp6_redirect_input(n, off);
817 /* m stays. */
818 break;
819
820 case ICMP6_ROUTER_RENUMBERING:
821 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
822 code != ICMP6_ROUTER_RENUMBERING_RESULT)
823 goto badcode;
824 if (icmp6len < sizeof(struct icmp6_router_renum))
825 goto badlen;
826 break;
827
828 default:
829 nd6log((LOG_DEBUG,
830 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
831 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
832 ip6_sprintf(&ip6->ip6_dst),
833 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
834 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
835 /* ICMPv6 error: MUST deliver it by spec... */
836 code = PRC_NCMDS;
837 /* deliver */
838 } else {
839 /* ICMPv6 informational: MUST not deliver */
840 break;
841 }
842 deliver:
843 if (icmp6_notify_error(m, off, icmp6len, code)) {
844 /* In this case, m should've been freed. */
845 return (IPPROTO_DONE);
846 }
847 break;
848
849 badcode:
850 icmp6stat.icp6s_badcode++;
851 break;
852
853 badlen:
854 icmp6stat.icp6s_badlen++;
855 break;
856 }
857
858 /* deliver the packet to appropriate sockets */
859 icmp6_rip6_input(&m, *offp);
860
861 return IPPROTO_DONE;
862
863 freeit:
864 m_freem(m);
865 return IPPROTO_DONE;
866 }
867
868 static int
869 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code)
870 {
871 struct icmp6_hdr *icmp6;
872 struct ip6_hdr *eip6;
873 u_int32_t notifymtu;
874 struct sockaddr_in6 icmp6src, icmp6dst;
875
876 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
877 icmp6stat.icp6s_tooshort++;
878 goto freeit;
879 }
880 #ifndef PULLDOWN_TEST
881 IP6_EXTHDR_CHECK(m, off,
882 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
883 -1);
884 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
885 #else
886 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
887 sizeof(*icmp6) + sizeof(struct ip6_hdr));
888 if (icmp6 == NULL) {
889 icmp6stat.icp6s_tooshort++;
890 return (-1);
891 }
892 #endif
893 eip6 = (struct ip6_hdr *)(icmp6 + 1);
894
895 /* Detect the upper level protocol */
896 {
897 u_int8_t nxt = eip6->ip6_nxt;
898 int eoff = off + sizeof(struct icmp6_hdr) +
899 sizeof(struct ip6_hdr);
900 struct ip6ctlparam ip6cp;
901 struct in6_addr *finaldst = NULL;
902 int icmp6type = icmp6->icmp6_type;
903 struct ip6_frag *fh;
904 struct ip6_rthdr *rth;
905 int rthlen;
906
907 while (1) { /* XXX: should avoid infinite loop explicitly? */
908 struct ip6_ext *eh;
909
910 switch (nxt) {
911 case IPPROTO_HOPOPTS:
912 case IPPROTO_DSTOPTS:
913 case IPPROTO_AH:
914 #ifndef PULLDOWN_TEST
915 IP6_EXTHDR_CHECK(m, 0,
916 eoff + sizeof(struct ip6_ext), -1);
917 eh = (struct ip6_ext *)
918 (mtod(m, caddr_t) + eoff);
919 #else
920 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
921 eoff, sizeof(*eh));
922 if (eh == NULL) {
923 icmp6stat.icp6s_tooshort++;
924 return (-1);
925 }
926 #endif
927
928 if (nxt == IPPROTO_AH)
929 eoff += (eh->ip6e_len + 2) << 2;
930 else
931 eoff += (eh->ip6e_len + 1) << 3;
932 nxt = eh->ip6e_nxt;
933 break;
934 case IPPROTO_ROUTING:
935 /*
936 * When the erroneous packet contains a
937 * routing header, we should examine the
938 * header to determine the final destination.
939 * Otherwise, we can't properly update
940 * information that depends on the final
941 * destination (e.g. path MTU).
942 */
943 #ifndef PULLDOWN_TEST
944 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
945 -1);
946 rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
947 + eoff);
948 #else
949 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
950 eoff, sizeof(*rth));
951 if (rth == NULL) {
952 icmp6stat.icp6s_tooshort++;
953 return (-1);
954 }
955 #endif
956 rthlen = (rth->ip6r_len + 1) << 3;
957 eoff += rthlen;
958 nxt = rth->ip6r_nxt;
959 break;
960 case IPPROTO_FRAGMENT:
961 #ifndef PULLDOWN_TEST
962 IP6_EXTHDR_CHECK(m, 0, eoff +
963 sizeof(struct ip6_frag),
964 -1);
965 fh = (struct ip6_frag *)(mtod(m, caddr_t)
966 + eoff);
967 #else
968 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
969 eoff, sizeof(*fh));
970 if (fh == NULL) {
971 icmp6stat.icp6s_tooshort++;
972 return (-1);
973 }
974 #endif
975 /*
976 * Data after a fragment header is meaningless
977 * unless it is the first fragment, but
978 * we'll go to the notify label for path MTU
979 * discovery.
980 */
981 if (fh->ip6f_offlg & IP6F_OFF_MASK)
982 goto notify;
983
984 eoff += sizeof(struct ip6_frag);
985 nxt = fh->ip6f_nxt;
986 break;
987 default:
988 /*
989 * This case includes ESP and the No Next
990 * Header. In such cases going to the notify
991 * label does not have any meaning
992 * (i.e. pr_ctlinput will be NULL), but we go
993 * anyway since we might have to update
994 * path MTU information.
995 */
996 goto notify;
997 }
998 }
999 notify:
1000 #ifndef PULLDOWN_TEST
1001 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1002 #else
1003 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1004 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1005 if (icmp6 == NULL) {
1006 icmp6stat.icp6s_tooshort++;
1007 return (-1);
1008 }
1009 #endif
1010
1011 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1012 bzero(&icmp6dst, sizeof(icmp6dst));
1013 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1014 icmp6dst.sin6_family = AF_INET6;
1015 if (finaldst == NULL)
1016 icmp6dst.sin6_addr = eip6->ip6_dst;
1017 else
1018 icmp6dst.sin6_addr = *finaldst;
1019 if (in6_addr2zoneid(m->m_pkthdr.rcvif, &icmp6dst.sin6_addr,
1020 &icmp6dst.sin6_scope_id))
1021 goto freeit;
1022 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst,
1023 NULL, NULL)) {
1024 /* should be impossbile */
1025 nd6log((LOG_DEBUG,
1026 "icmp6_notify_error: in6_embedscope failed\n"));
1027 goto freeit;
1028 }
1029
1030 /*
1031 * retrieve parameters from the inner IPv6 header, and convert
1032 * them into sockaddr structures.
1033 */
1034 bzero(&icmp6src, sizeof(icmp6src));
1035 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1036 icmp6src.sin6_family = AF_INET6;
1037 icmp6src.sin6_addr = eip6->ip6_src;
1038 if (in6_addr2zoneid(m->m_pkthdr.rcvif, &icmp6src.sin6_addr,
1039 &icmp6src.sin6_scope_id))
1040 goto freeit;
1041 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src,
1042 NULL, NULL)) {
1043 /* should be impossbile */
1044 nd6log((LOG_DEBUG,
1045 "icmp6_notify_error: in6_embedscope failed\n"));
1046 goto freeit;
1047 }
1048 icmp6src.sin6_flowinfo =
1049 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1050
1051 if (finaldst == NULL)
1052 finaldst = &eip6->ip6_dst;
1053 ip6cp.ip6c_m = m;
1054 ip6cp.ip6c_icmp6 = icmp6;
1055 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1056 ip6cp.ip6c_off = eoff;
1057 ip6cp.ip6c_finaldst = finaldst;
1058 ip6cp.ip6c_src = &icmp6src;
1059 ip6cp.ip6c_nxt = nxt;
1060
1061 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1062 notifymtu = ntohl(icmp6->icmp6_mtu);
1063 ip6cp.ip6c_cmdarg = (void *)&notifymtu;
1064 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1065 }
1066
1067 so_pr_ctlinput(
1068 &inet6sw[ip6_protox[nxt]],
1069 code, (struct sockaddr *)&icmp6dst, &ip6cp);
1070 }
1071 return (0);
1072
1073 freeit:
1074 m_freem(m);
1075 return (-1);
1076 }
1077
1078 void
1079 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1080 {
1081 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1082 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1083 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1084 u_int mtu = ntohl(icmp6->icmp6_mtu);
1085 struct rtentry *rt = NULL;
1086 struct sockaddr_in6 sin6;
1087
1088 if (!validated)
1089 return;
1090
1091 bzero(&sin6, sizeof(sin6));
1092 sin6.sin6_family = PF_INET6;
1093 sin6.sin6_len = sizeof(struct sockaddr_in6);
1094 sin6.sin6_addr = *dst;
1095 /* XXX normally, this won't happen */
1096 if (IN6_IS_ADDR_LINKLOCAL(dst)) {
1097 sin6.sin6_addr.s6_addr16[1] =
1098 htons(m->m_pkthdr.rcvif->if_index);
1099 }
1100 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
1101 rt = rtpurelookup((struct sockaddr *)&sin6);
1102 if (rt != NULL && (rt->rt_flags & RTF_HOST) &&
1103 !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
1104 if (mtu < IPV6_MMTU) { /* XXX */
1105 rt->rt_rmx.rmx_locks |= RTV_MTU;
1106 } else if (mtu < rt->rt_ifp->if_mtu &&
1107 rt->rt_rmx.rmx_mtu > mtu) {
1108 icmp6stat.icp6s_pmtuchg++;
1109 rt->rt_rmx.rmx_mtu = mtu;
1110 }
1111 }
1112 if (rt)
1113 --rt->rt_refcnt;
1114 }
1115
1116 /*
1117 * Process a Node Information Query packet, based on
1118 * draft-ietf-ipngwg-icmp-name-lookups-07.
1119 *
1120 * Spec incompatibilities:
1121 * - IPv6 Subject address handling
1122 * - IPv4 Subject address handling support missing
1123 * - Proxy reply (answer even if it's not for me)
1124 * - joins NI group address at in6_ifattach() time only, does not cope
1125 * with hostname changes by sethostname(3)
1126 */
1127 #define hostnamelen strlen(hostname)
1128 static struct mbuf *
1129 ni6_input(struct mbuf *m, int off)
1130 {
1131 struct icmp6_nodeinfo *ni6, *nni6;
1132 struct mbuf *n = NULL;
1133 u_int16_t qtype;
1134 int subjlen;
1135 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1136 struct ni_reply_fqdn *fqdn;
1137 int addrs; /* for NI_QTYPE_NODEADDR */
1138 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1139 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
1140 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
1141 struct ip6_hdr *ip6;
1142 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1143 char *subj = NULL;
1144 struct in6_ifaddr *ia6 = NULL;
1145
1146 ip6 = mtod(m, struct ip6_hdr *);
1147 #ifndef PULLDOWN_TEST
1148 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1149 #else
1150 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1151 if (ni6 == NULL) {
1152 /* m is already reclaimed */
1153 return NULL;
1154 }
1155 #endif
1156
1157 /*
1158 * Validate IPv6 destination address.
1159 *
1160 * The Responder must discard the Query without further processing
1161 * unless it is one of the Responder's unicast or anycast addresses, or
1162 * a link-local scope multicast address which the Responder has joined.
1163 * [icmp-name-lookups-07, Section 4.]
1164 */
1165 bzero(&sin6, sizeof(sin6));
1166 sin6.sin6_family = AF_INET6;
1167 sin6.sin6_len = sizeof(struct sockaddr_in6);
1168 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
1169 /* XXX scopeid */
1170 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) {
1171 /* unicast/anycast, fine */
1172 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
1173 (icmp6_nodeinfo & 4) == 0) {
1174 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1175 "a temporary address in %s:%d",
1176 __FILE__, __LINE__));
1177 goto bad;
1178 }
1179 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr))
1180 ; /* link-local multicast, fine */
1181 else
1182 goto bad;
1183
1184 /* validate query Subject field. */
1185 qtype = ntohs(ni6->ni_qtype);
1186 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1187 switch (qtype) {
1188 case NI_QTYPE_NOOP:
1189 case NI_QTYPE_SUPTYPES:
1190 /* 07 draft */
1191 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1192 break;
1193 /* FALLTHROUGH */
1194 case NI_QTYPE_FQDN:
1195 case NI_QTYPE_NODEADDR:
1196 switch (ni6->ni_code) {
1197 case ICMP6_NI_SUBJ_IPV6:
1198 #if ICMP6_NI_SUBJ_IPV6 != 0
1199 case 0:
1200 #endif
1201 /*
1202 * backward compatibility - try to accept 03 draft
1203 * format, where no Subject is present.
1204 */
1205 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1206 subjlen == 0) {
1207 oldfqdn++;
1208 break;
1209 }
1210 #if ICMP6_NI_SUBJ_IPV6 != 0
1211 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1212 goto bad;
1213 #endif
1214
1215 if (subjlen != sizeof(sin6.sin6_addr))
1216 goto bad;
1217
1218 /*
1219 * Validate Subject address.
1220 *
1221 * Not sure what exactly "address belongs to the node"
1222 * means in the spec, is it just unicast, or what?
1223 *
1224 * At this moment we consider Subject address as
1225 * "belong to the node" if the Subject address equals
1226 * to the IPv6 destination address; validation for
1227 * IPv6 destination address should have done enough
1228 * check for us.
1229 *
1230 * We do not do proxy at this moment.
1231 */
1232 /* m_pulldown instead of copy? */
1233 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1234 subjlen, (caddr_t)&sin6.sin6_addr);
1235 if (in6_addr2zoneid(m->m_pkthdr.rcvif,
1236 &sin6.sin6_addr, &sin6.sin6_scope_id))
1237 goto bad;
1238 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL);
1239 bzero(&sin6_d, sizeof(sin6_d));
1240 sin6_d.sin6_family = AF_INET6; /* not used, actually */
1241 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */
1242 sin6_d.sin6_addr = ip6->ip6_dst;
1243 if (in6_addr2zoneid(m->m_pkthdr.rcvif,
1244 &ip6->ip6_dst, &sin6_d.sin6_scope_id))
1245 goto bad;
1246 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL);
1247 subj = (char *)&sin6;
1248 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
1249 break;
1250
1251 /*
1252 * XXX if we are to allow other cases, we should really
1253 * be careful about scope here.
1254 * basically, we should disallow queries toward IPv6
1255 * destination X with subject Y, if scope(X) > scope(Y).
1256 * if we allow scope(X) > scope(Y), it will result in
1257 * information leakage across scope boundary.
1258 */
1259 goto bad;
1260
1261 case ICMP6_NI_SUBJ_FQDN:
1262 /*
1263 * Validate Subject name with gethostname(3).
1264 *
1265 * The behavior may need some debate, since:
1266 * - we are not sure if the node has FQDN as
1267 * hostname (returned by gethostname(3)).
1268 * - the code does wildcard match for truncated names.
1269 * however, we are not sure if we want to perform
1270 * wildcard match, if gethostname(3) side has
1271 * truncated hostname.
1272 */
1273 n = ni6_nametodns(hostname, hostnamelen, 0);
1274 if (!n || n->m_next || n->m_len == 0)
1275 goto bad;
1276 IP6_EXTHDR_GET(subj, char *, m,
1277 off + sizeof(struct icmp6_nodeinfo), subjlen);
1278 if (subj == NULL)
1279 goto bad;
1280 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1281 n->m_len)) {
1282 goto bad;
1283 }
1284 m_freem(n);
1285 n = NULL;
1286 break;
1287
1288 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1289 default:
1290 goto bad;
1291 }
1292 break;
1293 }
1294
1295 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1296 switch (qtype) {
1297 case NI_QTYPE_FQDN:
1298 if ((icmp6_nodeinfo & 1) == 0)
1299 goto bad;
1300 break;
1301 case NI_QTYPE_NODEADDR:
1302 if ((icmp6_nodeinfo & 2) == 0)
1303 goto bad;
1304 break;
1305 }
1306
1307 /* guess reply length */
1308 switch (qtype) {
1309 case NI_QTYPE_NOOP:
1310 break; /* no reply data */
1311 case NI_QTYPE_SUPTYPES:
1312 replylen += sizeof(u_int32_t);
1313 break;
1314 case NI_QTYPE_FQDN:
1315 /* XXX will append an mbuf */
1316 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1317 break;
1318 case NI_QTYPE_NODEADDR:
1319 addrs = ni6_addrs(ni6, m, &ifp, subj);
1320 if ((replylen += addrs * (sizeof(struct in6_addr) +
1321 sizeof(u_int32_t))) > MCLBYTES)
1322 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1323 break;
1324 default:
1325 /*
1326 * XXX: We must return a reply with the ICMP6 code
1327 * `unknown Qtype' in this case. However we regard the case
1328 * as an FQDN query for backward compatibility.
1329 * Older versions set a random value to this field,
1330 * so it rarely varies in the defined qtypes.
1331 * But the mechanism is not reliable...
1332 * maybe we should obsolete older versions.
1333 */
1334 qtype = NI_QTYPE_FQDN;
1335 /* XXX will append an mbuf */
1336 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1337 oldfqdn++;
1338 break;
1339 }
1340
1341 /* allocate an mbuf to reply. */
1342 if (replylen > MCLBYTES) {
1343 /*
1344 * XXX: should we try to allocate more? But MCLBYTES
1345 * is probably much larger than IPV6_MMTU...
1346 */
1347 goto bad;
1348 }
1349 n = m_getb(replylen, M_NOWAIT, m->m_type, M_PKTHDR);
1350 if (n == NULL) {
1351 m_freem(m);
1352 return (NULL);
1353 }
1354 M_MOVE_PKTHDR(n, m); /* just for recvif */
1355 n->m_pkthdr.len = n->m_len = replylen;
1356
1357 /* copy mbuf header and IPv6 + Node Information base headers */
1358 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1359 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1360 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1361
1362 /* qtype dependent procedure */
1363 switch (qtype) {
1364 case NI_QTYPE_NOOP:
1365 nni6->ni_code = ICMP6_NI_SUCCESS;
1366 nni6->ni_flags = 0;
1367 break;
1368 case NI_QTYPE_SUPTYPES:
1369 {
1370 u_int32_t v;
1371 nni6->ni_code = ICMP6_NI_SUCCESS;
1372 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1373 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1374 v = (u_int32_t)htonl(0x0000000f);
1375 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1376 break;
1377 }
1378 case NI_QTYPE_FQDN:
1379 nni6->ni_code = ICMP6_NI_SUCCESS;
1380 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1381 sizeof(struct ip6_hdr) +
1382 sizeof(struct icmp6_nodeinfo));
1383 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1384 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1385 /*
1386 * XXX do we really have FQDN in variable "hostname"?
1387 */
1388 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1389 if (n->m_next == NULL)
1390 goto bad;
1391 /* XXX we assume that n->m_next is not a chain */
1392 if (n->m_next->m_next != NULL)
1393 goto bad;
1394 n->m_pkthdr.len += n->m_next->m_len;
1395 break;
1396 case NI_QTYPE_NODEADDR:
1397 {
1398 int lenlim, copied;
1399
1400 nni6->ni_code = ICMP6_NI_SUCCESS;
1401 n->m_pkthdr.len = n->m_len =
1402 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1403 lenlim = M_TRAILINGSPACE(n);
1404 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1405 /* XXX: reset mbuf length */
1406 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1407 sizeof(struct icmp6_nodeinfo) + copied;
1408 break;
1409 }
1410 default:
1411 break; /* XXX impossible! */
1412 }
1413
1414 nni6->ni_type = ICMP6_NI_REPLY;
1415 m_freem(m);
1416 return (n);
1417
1418 bad:
1419 m_freem(m);
1420 if (n)
1421 m_freem(n);
1422 return (NULL);
1423 }
1424 #undef hostnamelen
1425
1426 /*
1427 * make a mbuf with DNS-encoded string. no compression support.
1428 *
1429 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1430 * treated as truncated name (two \0 at the end). this is a wild guess.
1431 */
1432 static struct mbuf *
1433 ni6_nametodns(const char *name, int namelen,
1434 int old) /* return pascal string if non-zero */
1435 {
1436 struct mbuf *m;
1437 char *cp, *ep;
1438 const char *p, *q;
1439 int i, len, nterm;
1440
1441 if (old)
1442 len = namelen + 1;
1443 else
1444 len = MCLBYTES;
1445
1446 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1447 m = m_getb(len, M_NOWAIT, MT_DATA, 0);
1448 if (!m)
1449 goto fail;
1450
1451 if (old) {
1452 m->m_len = len;
1453 *mtod(m, char *) = namelen;
1454 bcopy(name, mtod(m, char *) + 1, namelen);
1455 return m;
1456 } else {
1457 m->m_len = 0;
1458 cp = mtod(m, char *);
1459 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1460
1461 /* if not certain about my name, return empty buffer */
1462 if (namelen == 0)
1463 return m;
1464
1465 /*
1466 * guess if it looks like shortened hostname, or FQDN.
1467 * shortened hostname needs two trailing "\0".
1468 */
1469 i = 0;
1470 for (p = name; p < name + namelen; p++) {
1471 if (*p && *p == '.')
1472 i++;
1473 }
1474 if (i < 2)
1475 nterm = 2;
1476 else
1477 nterm = 1;
1478
1479 p = name;
1480 while (cp < ep && p < name + namelen) {
1481 i = 0;
1482 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1483 i++;
1484 /* result does not fit into mbuf */
1485 if (cp + i + 1 >= ep)
1486 goto fail;
1487 /*
1488 * DNS label length restriction, RFC1035 page 8.
1489 * "i == 0" case is included here to avoid returning
1490 * 0-length label on "foo..bar".
1491 */
1492 if (i <= 0 || i >= 64)
1493 goto fail;
1494 *cp++ = i;
1495 bcopy(p, cp, i);
1496 cp += i;
1497 p = q;
1498 if (p < name + namelen && *p == '.')
1499 p++;
1500 }
1501 /* termination */
1502 if (cp + nterm >= ep)
1503 goto fail;
1504 while (nterm-- > 0)
1505 *cp++ = '\0';
1506 m->m_len = cp - mtod(m, char *);
1507 return m;
1508 }
1509
1510 panic("should not reach here");
1511 /* NOTREACHED */
1512
1513 fail:
1514 if (m)
1515 m_freem(m);
1516 return NULL;
1517 }
1518
1519 /*
1520 * check if two DNS-encoded string matches. takes care of truncated
1521 * form (with \0\0 at the end). no compression support.
1522 * XXX upper/lowercase match (see RFC2065)
1523 */
1524 static int
1525 ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1526 {
1527 const char *a0, *b0;
1528 int l;
1529
1530 /* simplest case - need validation? */
1531 if (alen == blen && bcmp(a, b, alen) == 0)
1532 return 1;
1533
1534 a0 = a;
1535 b0 = b;
1536
1537 /* termination is mandatory */
1538 if (alen < 2 || blen < 2)
1539 return 0;
1540 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1541 return 0;
1542 alen--;
1543 blen--;
1544
1545 while (a - a0 < alen && b - b0 < blen) {
1546 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1547 return 0;
1548
1549 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1550 return 0;
1551 /* we don't support compression yet */
1552 if (a[0] >= 64 || b[0] >= 64)
1553 return 0;
1554
1555 /* truncated case */
1556 if (a[0] == 0 && a - a0 == alen - 1)
1557 return 1;
1558 if (b[0] == 0 && b - b0 == blen - 1)
1559 return 1;
1560 if (a[0] == 0 || b[0] == 0)
1561 return 0;
1562
1563 if (a[0] != b[0])
1564 return 0;
1565 l = a[0];
1566 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1567 return 0;
1568 if (bcmp(a + 1, b + 1, l) != 0)
1569 return 0;
1570
1571 a += 1 + l;
1572 b += 1 + l;
1573 }
1574
1575 if (a - a0 == alen && b - b0 == blen)
1576 return 1;
1577 else
1578 return 0;
1579 }
1580
1581 /*
1582 * calculate the number of addresses to be returned in the node info reply.
1583 */
1584 static int
1585 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
1586 char *subj)
1587 {
1588 const struct ifnet_array *arr;
1589 struct in6_ifaddr *ifa6;
1590 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
1591 int addrs = 0, addrsofif, iffound = 0;
1592 int niflags = ni6->ni_flags;
1593 int i;
1594
1595 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1596 switch (ni6->ni_code) {
1597 case ICMP6_NI_SUBJ_IPV6:
1598 if (subj == NULL) /* must be impossible... */
1599 return (0);
1600 subj_ip6 = (struct sockaddr_in6 *)subj;
1601 break;
1602 default:
1603 /*
1604 * XXX: we only support IPv6 subject address for
1605 * this Qtype.
1606 */
1607 return (0);
1608 }
1609 }
1610
1611 arr = ifnet_array_get();
1612 for (i = 0; i < arr->ifnet_count; ++i) {
1613 struct ifnet *ifp = arr->ifnet_arr[i];
1614 struct ifaddr_container *ifac;
1615
1616 addrsofif = 0;
1617 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link)
1618 {
1619 struct ifaddr *ifa = ifac->ifa;
1620
1621 if (ifa->ifa_addr->sa_family != AF_INET6)
1622 continue;
1623 ifa6 = (struct in6_ifaddr *)ifa;
1624
1625 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1626 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
1627 &ifa6->ia_addr.sin6_addr))
1628 iffound = 1;
1629
1630 /*
1631 * IPv4-mapped addresses can only be returned by a
1632 * Node Information proxy, since they represent
1633 * addresses of IPv4-only nodes, which perforce do
1634 * not implement this protocol.
1635 * [icmp-name-lookups-07, Section 5.4]
1636 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1637 * this function at this moment.
1638 */
1639
1640 /* What do we have to do about ::1? */
1641 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1642 case IPV6_ADDR_SCOPE_LINKLOCAL:
1643 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1644 continue;
1645 break;
1646 case IPV6_ADDR_SCOPE_SITELOCAL:
1647 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1648 continue;
1649 break;
1650 case IPV6_ADDR_SCOPE_GLOBAL:
1651 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1652 continue;
1653 break;
1654 default:
1655 continue;
1656 }
1657
1658 /*
1659 * check if anycast is okay.
1660 * XXX: just experimental. not in the spec.
1661 */
1662 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) &&
1663 !(niflags & NI_NODEADDR_FLAG_ANYCAST))
1664 continue; /* we need only unicast addresses */
1665 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) &&
1666 (icmp6_nodeinfo & 4) == 0) {
1667 continue;
1668 }
1669 addrsofif++; /* count the address */
1670 }
1671 if (iffound) {
1672 *ifpp = ifp;
1673 return (addrsofif);
1674 }
1675
1676 addrs += addrsofif;
1677 }
1678
1679 return (addrs);
1680 }
1681
1682 static int
1683 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
1684 struct ifnet *ifp0, int resid)
1685 {
1686 const struct ifnet_array *arr;
1687 struct in6_ifaddr *ifa6;
1688 int copied = 0, allow_deprecated = 0;
1689 u_char *cp = (u_char *)(nni6 + 1);
1690 int niflags = ni6->ni_flags;
1691 u_int32_t ltime;
1692 int idx, idx_dep = -1;
1693
1694 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1695 return (0); /* needless to copy */
1696
1697 arr = ifnet_array_get();
1698 if (ifp0 == NULL) {
1699 idx = 0;
1700 } else {
1701 for (idx = 0; idx < arr->ifnet_count; ++idx) {
1702 if (arr->ifnet_arr[idx] == ifp0)
1703 break;
1704 }
1705 }
1706
1707 again:
1708
1709 for (; idx < arr->ifnet_count; ++idx) {
1710 struct ifnet *ifp = arr->ifnet_arr[idx];
1711 struct ifaddr_container *ifac;
1712
1713 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1714 struct ifaddr *ifa = ifac->ifa;
1715
1716 if (ifa->ifa_addr->sa_family != AF_INET6)
1717 continue;
1718 ifa6 = (struct in6_ifaddr *)ifa;
1719
1720 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) &&
1721 allow_deprecated == 0) {
1722 /*
1723 * prefererred address should be put before
1724 * deprecated addresses.
1725 */
1726
1727 /* record the interface for later search */
1728 if (idx_dep < 0)
1729 idx_dep = idx;
1730
1731 continue;
1732 }
1733 else if (!(ifa6->ia6_flags & IN6_IFF_DEPRECATED) &&
1734 allow_deprecated != 0)
1735 continue; /* we now collect deprecated addrs */
1736
1737 /* What do we have to do about ::1? */
1738 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1739 case IPV6_ADDR_SCOPE_LINKLOCAL:
1740 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1741 continue;
1742 break;
1743 case IPV6_ADDR_SCOPE_SITELOCAL:
1744 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1745 continue;
1746 break;
1747 case IPV6_ADDR_SCOPE_GLOBAL:
1748 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1749 continue;
1750 break;
1751 default:
1752 continue;
1753 }
1754
1755 /*
1756 * check if anycast is okay.
1757 * XXX: just experimental. not in the spec.
1758 */
1759 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) &&
1760 !(niflags & NI_NODEADDR_FLAG_ANYCAST))
1761 continue;
1762 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) &&
1763 (icmp6_nodeinfo & 4) == 0) {
1764 continue;
1765 }
1766
1767 /* now we can copy the address */
1768 if (resid < sizeof(struct in6_addr) +
1769 sizeof(u_int32_t)) {
1770 /*
1771 * We give up much more copy.
1772 * Set the truncate flag and return.
1773 */
1774 nni6->ni_flags |=
1775 NI_NODEADDR_FLAG_TRUNCATE;
1776 return (copied);
1777 }
1778
1779 /*
1780 * Set the TTL of the address.
1781 * The TTL value should be one of the following
1782 * according to the specification:
1783 *
1784 * 1. The remaining lifetime of a DHCP lease on the
1785 * address, or
1786 * 2. The remaining Valid Lifetime of a prefix from
1787 * which the address was derived through Stateless
1788 * Autoconfiguration.
1789 *
1790 * Note that we currently do not support stateful
1791 * address configuration by DHCPv6, so the former
1792 * case can't happen.
1793 */
1794 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1795 ltime = ND6_INFINITE_LIFETIME;
1796 else {
1797 if (ifa6->ia6_lifetime.ia6t_expire >
1798 time_uptime)
1799 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime);
1800 else
1801 ltime = 0;
1802 }
1803
1804 bcopy(&ltime, cp, sizeof(u_int32_t));
1805 cp += sizeof(u_int32_t);
1806
1807 /* copy the address itself */
1808 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1809 sizeof(struct in6_addr));
1810 in6_clearscope((struct in6_addr *)cp); /* XXX */
1811 cp += sizeof(struct in6_addr);
1812
1813 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1814 copied += (sizeof(struct in6_addr) +
1815 sizeof(u_int32_t));
1816 }
1817 if (ifp0) /* we need search only on the specified IF */
1818 break;
1819 }
1820
1821 if (allow_deprecated == 0 && idx_dep >= 0) {
1822 idx = idx_dep;
1823 allow_deprecated = 1;
1824
1825 goto again;
1826 }
1827
1828 return (copied);
1829 }
1830
1831 /*
1832 * XXX almost dup'ed code with rip6_input.
1833 */
1834 static int
1835 icmp6_rip6_input(struct mbuf **mp, int off)
1836 {
1837 struct mbuf *m = *mp;
1838 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1839 struct in6pcb *in6p;
1840 struct in6pcb *last = NULL;
1841 struct sockaddr_in6 fromsa;
1842 struct icmp6_hdr *icmp6;
1843 struct mbuf *opts = NULL;
1844
1845 #ifndef PULLDOWN_TEST
1846 /* this is assumed to be safe. */
1847 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1848 #else
1849 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1850 if (icmp6 == NULL) {
1851 /* m is already reclaimed */
1852 return IPPROTO_DONE;
1853 }
1854 #endif
1855
1856 bzero(&fromsa, sizeof(fromsa));
1857 fromsa.sin6_len = sizeof(struct sockaddr_in6);
1858 fromsa.sin6_family = AF_INET6;
1859 /* KAME hack: recover scopeid */
1860 in6_recoverscope(&fromsa, &ip6->ip6_src, m->m_pkthdr.rcvif);
1861
1862 LIST_FOREACH(in6p, &ripcbinfo.pcblisthead, inp_list)
1863 {
1864 if (in6p->inp_flags & INP_PLACEMARKER)
1865 continue;
1866 if (!INP_ISIPV6(in6p))
1867 continue;
1868 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
1869 continue;
1870 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1871 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1872 continue;
1873 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1874 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1875 continue;
1876 if (in6p->in6p_icmp6filt
1877 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1878 in6p->in6p_icmp6filt))
1879 continue;
1880 if (last) {
1881 struct socket *so;
1882 struct mbuf *n;
1883
1884 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1885 if (last->in6p_flags & IN6P_CONTROLOPTS)
1886 ip6_savecontrol(last, &opts, ip6, n);
1887 /* strip intermediate headers */
1888 m_adj(n, off);
1889 so = last->in6p_socket;
1890 lwkt_gettoken(&so->so_rcv.ssb_token);
1891 if (ssb_appendaddr(&so->so_rcv,
1892 (struct sockaddr *)&fromsa, n, opts) == 0) {
1893 /* should notify about lost packet */
1894 m_freem(n);
1895 if (opts)
1896 m_freem(opts);
1897 } else {
1898 sorwakeup(so);
1899 }
1900 lwkt_reltoken(&so->so_rcv.ssb_token);
1901 opts = NULL;
1902 }
1903 }
1904 last = in6p;
1905 }
1906 if (last) {
1907 struct socket *so;
1908
1909 if (last->in6p_flags & IN6P_CONTROLOPTS)
1910 ip6_savecontrol(last, &opts, ip6, m);
1911 /* strip intermediate headers */
1912 m_adj(m, off);
1913 so = last->in6p_socket;
1914 lwkt_gettoken(&so->so_rcv.ssb_token);
1915 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&fromsa,
1916 m, opts) == 0) {
1917 m_freem(m);
1918 if (opts)
1919 m_freem(opts);
1920 } else {
1921 sorwakeup(so);
1922 }
1923 lwkt_reltoken(&so->so_rcv.ssb_token);
1924 } else {
1925 m_freem(m);
1926 ip6stat.ip6s_delivered--;
1927 }
1928 return IPPROTO_DONE;
1929 }
1930
1931 /*
1932 * Reflect the ip6 packet back to the source.
1933 * OFF points to the icmp6 header, counted from the top of the mbuf.
1934 */
1935 void
1936 icmp6_reflect(struct mbuf *m, size_t off)
1937 {
1938 struct ip6_hdr *ip6;
1939 struct icmp6_hdr *icmp6;
1940 struct in6_ifaddr *ia;
1941 struct in6_addr t, *src = NULL;
1942 int plen;
1943 int type, code;
1944 struct ifnet *outif = NULL;
1945 struct sockaddr_in6 sa6_src, sa6_dst;
1946 #ifdef COMPAT_RFC1885
1947 int mtu = IPV6_MMTU;
1948 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst;
1949 #endif
1950
1951 /* too short to reflect */
1952 if (off < sizeof(struct ip6_hdr)) {
1953 nd6log((LOG_DEBUG,
1954 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
1955 (u_long)off, (u_long)sizeof(struct ip6_hdr),
1956 __FILE__, __LINE__));
1957 goto bad;
1958 }
1959
1960 /*
1961 * If there are extra headers between IPv6 and ICMPv6, strip
1962 * off that header first.
1963 */
1964 #ifdef DIAGNOSTIC
1965 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
1966 panic("assumption failed in icmp6_reflect");
1967 #endif
1968 if (off > sizeof(struct ip6_hdr)) {
1969 size_t l;
1970 struct ip6_hdr nip6;
1971
1972 l = off - sizeof(struct ip6_hdr);
1973 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
1974 m_adj(m, l);
1975 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
1976 if (m->m_len < l) {
1977 if ((m = m_pullup(m, l)) == NULL)
1978 return;
1979 }
1980 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
1981 } else /* off == sizeof(struct ip6_hdr) */ {
1982 size_t l;
1983 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
1984 if (m->m_len < l) {
1985 if ((m = m_pullup(m, l)) == NULL)
1986 return;
1987 }
1988 }
1989 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
1990 ip6 = mtod(m, struct ip6_hdr *);
1991 ip6->ip6_nxt = IPPROTO_ICMPV6;
1992 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
1993 type = icmp6->icmp6_type; /* keep type for statistics */
1994 code = icmp6->icmp6_code; /* ditto. */
1995
1996 t = ip6->ip6_dst;
1997 /*
1998 * ip6_input() drops a packet if its src is multicast.
1999 * So, the src is never multicast.
2000 */
2001 ip6->ip6_dst = ip6->ip6_src;
2002
2003 /*
2004 * XXX: make sure to embed scope zone information, using
2005 * already embedded IDs or the received interface (if any).
2006 * Note that rcvif may be NULL.
2007 * TODO: scoped routing case (XXX).
2008 */
2009 bzero(&sa6_src, sizeof(sa6_src));
2010 sa6_src.sin6_family = AF_INET6;
2011 sa6_src.sin6_len = sizeof(sa6_src);
2012 sa6_src.sin6_addr = ip6->ip6_dst;
2013 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
2014 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL);
2015 bzero(&sa6_dst, sizeof(sa6_dst));
2016 sa6_dst.sin6_family = AF_INET6;
2017 sa6_dst.sin6_len = sizeof(sa6_dst);
2018 sa6_dst.sin6_addr = t;
2019 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
2020 in6_embedscope(&t, &sa6_dst, NULL, NULL);
2021
2022 #ifdef COMPAT_RFC1885
2023 /*
2024 * xxx guess MTU
2025 * RFC 1885 requires that echo reply should be truncated if it
2026 * does not fit in with (return) path MTU, but the description was
2027 * removed in the new spec.
2028 */
2029 if (icmp6_reflect_rt.ro_rt == 0 ||
2030 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) {
2031 if (icmp6_reflect_rt.ro_rt) {
2032 RTFREE(icmp6_reflect_rt.ro_rt);
2033 icmp6_reflect_rt.ro_rt = 0;
2034 }
2035 bzero(sin6, sizeof(*sin6));
2036 sin6->sin6_family = PF_INET6;
2037 sin6->sin6_len = sizeof(struct sockaddr_in6);
2038 sin6->sin6_addr = ip6->ip6_dst;
2039
2040 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt,
2041 RTF_PRCLONING);
2042 }
2043
2044 if (icmp6_reflect_rt.ro_rt == 0)
2045 goto bad;
2046
2047 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST)
2048 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu)
2049 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu;
2050
2051 if (mtu < m->m_pkthdr.len) {
2052 plen -= (m->m_pkthdr.len - mtu);
2053 m_adj(m, mtu - m->m_pkthdr.len);
2054 }
2055 #endif
2056 /*
2057 * If the incoming packet was addressed directly to us(i.e. unicast),
2058 * use dst as the src for the reply.
2059 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible
2060 * (for example) when we encounter an error while forwarding procedure
2061 * destined to a duplicated address of ours.
2062 */
2063 for (ia = in6_ifaddr; ia; ia = ia->ia_next)
2064 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
2065 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2066 src = &t;
2067 break;
2068 }
2069 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
2070 /*
2071 * This is the case if the dst is our link-local address
2072 * and the sender is also ourselves.
2073 */
2074 src = &t;
2075 }
2076
2077 if (src == NULL) {
2078 int e;
2079 struct route_in6 ro;
2080
2081 /*
2082 * This case matches to multicasts, our anycast, or unicasts
2083 * that we do not own. Select a source address based on the
2084 * source address of the erroneous packet.
2085 */
2086 bzero(&ro, sizeof(ro));
2087 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e, NULL);
2088 if (ro.ro_rt)
2089 RTFREE(ro.ro_rt); /* XXX: we could use this */
2090 if (src == NULL) {
2091 nd6log((LOG_DEBUG,
2092 "icmp6_reflect: source can't be determined: "
2093 "dst=%s, error=%d\n",
2094 ip6_sprintf(&sa6_src.sin6_addr), e));
2095 goto bad;
2096 }
2097 }
2098
2099 ip6->ip6_src = *src;
2100
2101 ip6->ip6_flow = 0;
2102 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2103 ip6->ip6_vfc |= IPV6_VERSION;
2104 ip6->ip6_nxt = IPPROTO_ICMPV6;
2105 if (m->m_pkthdr.rcvif) {
2106 /* XXX: This may not be the outgoing interface */
2107 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2108 if (ip6->ip6_hlim < ip6_minhlim)
2109 ip6->ip6_hlim = ip6_minhlim;
2110 } else {
2111 ip6->ip6_hlim = ip6_defhlim;
2112 }
2113
2114 icmp6->icmp6_cksum = 0;
2115 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2116 sizeof(struct ip6_hdr), plen);
2117
2118 /*
2119 * XXX option handling
2120 */
2121
2122 m->m_flags &= ~(M_BCAST|M_MCAST);
2123
2124 #ifdef COMPAT_RFC1885
2125 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL);
2126 #else
2127 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2128 #endif
2129 if (outif)
2130 icmp6_ifoutstat_inc(outif, type, code);
2131
2132 return;
2133
2134 bad:
2135 m_freem(m);
2136 return;
2137 }
2138
2139 static void
2140 icmp6_fasttimo_dispatch(netmsg_t nmsg)
2141 {
2142
2143 ASSERT_NETISR0;
2144
2145 /* Reply ASAP. */
2146 crit_enter();
2147 netisr_replymsg(&nmsg->base, 0);
2148 crit_exit();
2149
2150 mld6_fasttimeo();
2151
2152 callout_reset(&icmp6_fasttimo_ch, ICMP6_FASTTIMO, icmp6_fasttimo, NULL);
2153 }
2154
2155 static void
2156 icmp6_fasttimo(void *dummy __unused)
2157 {
2158 struct netmsg_base *nmsg = &icmp6_fasttimo_nmsg;
2159
2160 KKASSERT(mycpuid == 0);
2161
2162 crit_enter();
2163 if (nmsg->lmsg.ms_flags & MSGF_DONE)
2164 netisr_sendmsg_oncpu(nmsg);
2165 crit_exit();
2166 }
2167
2168 static const char *
2169 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
2170 struct in6_addr *tgt6)
2171 {
2172 static char buf[1024];
2173 ksnprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2174 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
2175 return buf;
2176 }
2177
2178 void
2179 icmp6_redirect_input(struct mbuf *m, int off)
2180 {
2181 struct ifnet *ifp = m->m_pkthdr.rcvif;
2182 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2183 struct nd_redirect *nd_rd;
2184 int icmp6len = ntohs(ip6->ip6_plen);
2185 char *lladdr = NULL;
2186 int lladdrlen = 0;
2187 #if 0
2188 u_char *redirhdr = NULL;
2189 int redirhdrlen = 0;
2190 #endif
2191 struct rtentry *rt = NULL;
2192 int is_router;
2193 int is_onlink;
2194 struct in6_addr src6 = ip6->ip6_src;
2195 struct in6_addr redtgt6;
2196 struct in6_addr reddst6;
2197 union nd_opts ndopts;
2198
2199 if (!m || !ifp)
2200 return;
2201
2202 /* XXX if we are router, we don't update route by icmp6 redirect */
2203 if (ip6_forwarding)
2204 goto freeit;
2205 if (!icmp6_rediraccept)
2206 goto freeit;
2207
2208 #ifndef PULLDOWN_TEST
2209 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2210 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2211 #else
2212 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2213 if (nd_rd == NULL) {
2214 icmp6stat.icp6s_tooshort++;
2215 return;
2216 }
2217 #endif
2218 redtgt6 = nd_rd->nd_rd_target;
2219 reddst6 = nd_rd->nd_rd_dst;
2220
2221 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2222 redtgt6.s6_addr16[1] = htons(ifp->if_index);
2223 if (IN6_IS_ADDR_LINKLOCAL(&reddst6))
2224 reddst6.s6_addr16[1] = htons(ifp->if_index);
2225
2226 /* validation */
2227 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2228 nd6log((LOG_ERR,
2229 "ICMP6 redirect sent from %s rejected; "
2230 "must be from linklocal\n", ip6_sprintf(&src6)));
2231 goto bad;
2232 }
2233 if (ip6->ip6_hlim != 255) {
2234 nd6log((LOG_ERR,
2235 "ICMP6 redirect sent from %s rejected; "
2236 "hlim=%d (must be 255)\n",
2237 ip6_sprintf(&src6), ip6->ip6_hlim));
2238 goto bad;
2239 }
2240 {
2241 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2242 struct sockaddr_in6 sin6;
2243 struct in6_addr *gw6;
2244
2245 bzero(&sin6, sizeof(sin6));
2246 sin6.sin6_family = AF_INET6;
2247 sin6.sin6_len = sizeof(struct sockaddr_in6);
2248 bcopy(&reddst6, &sin6.sin6_addr, sizeof reddst6);
2249 rt = rtpurelookup((struct sockaddr *)&sin6);
2250 if (rt != NULL) {
2251 if (rt->rt_gateway == NULL ||
2252 rt->rt_gateway->sa_family != AF_INET6) {
2253 nd6log((LOG_ERR,
2254 "ICMP6 redirect rejected; no route "
2255 "with inet6 gateway found for redirect dst: %s\n",
2256 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2257 --rt->rt_refcnt;
2258 goto bad;
2259 }
2260
2261 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2262 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2263 nd6log((LOG_ERR,
2264 "ICMP6 redirect rejected; "
2265 "not equal to gw-for-src=%s (must be same): "
2266 "%s\n",
2267 ip6_sprintf(gw6),
2268 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2269 --rt->rt_refcnt;
2270 goto bad;
2271 }
2272 } else {
2273 nd6log((LOG_ERR,
2274 "ICMP6 redirect rejected; "
2275 "no route found for redirect dst: %s\n",
2276 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2277 goto bad;
2278 }
2279 --rt->rt_refcnt;
2280 rt = NULL;
2281 }
2282 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2283 nd6log((LOG_ERR,
2284 "ICMP6 redirect rejected; "
2285 "redirect dst must be unicast: %s\n",
2286 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2287 goto bad;
2288 }
2289
2290 is_router = is_onlink = 0;
2291 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2292 is_router = 1; /* router case */
2293 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2294 is_onlink = 1; /* on-link destination case */
2295 if (!is_router && !is_onlink) {
2296 nd6log((LOG_ERR,
2297 "ICMP6 redirect rejected; "
2298 "neither router case nor onlink case: %s\n",
2299 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2300 goto bad;
2301 }
2302 /* validation passed */
2303
2304 icmp6len -= sizeof(*nd_rd);
2305 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2306 if (nd6_options(&ndopts) < 0) {
2307 nd6log((LOG_INFO, "icmp6_redirect_input: "
2308 "invalid ND option, rejected: %s\n",
2309 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2310 /* nd6_options have incremented stats */
2311 goto freeit;
2312 }
2313
2314 if (ndopts.nd_opts_tgt_lladdr) {
2315 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2316 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2317 }
2318
2319 #if 0
2320 if (ndopts.nd_opts_rh) {
2321 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2322 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2323 }
2324 #endif
2325
2326 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2327 nd6log((LOG_INFO,
2328 "icmp6_redirect_input: lladdrlen mismatch for %s "
2329 "(if %d, icmp6 packet %d): %s\n",
2330 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
2331 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2332 goto bad;
2333 }
2334
2335 /* RFC 2461 8.3 */
2336 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2337 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2338
2339 if (!is_onlink) { /* better router case. perform rtredirect. */
2340 /* perform rtredirect */
2341 struct sockaddr_in6 sdst;
2342 struct sockaddr_in6 sgw;
2343 struct sockaddr_in6 ssrc;
2344
2345 bzero(&sdst, sizeof(sdst));
2346 bzero(&sgw, sizeof(sgw));
2347 bzero(&ssrc, sizeof(ssrc));
2348 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2349 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2350 sizeof(struct sockaddr_in6);
2351 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2352 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2353 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2354 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
2355 NULL, RTF_GATEWAY | RTF_HOST,
2356 (struct sockaddr *)&ssrc);
2357 }
2358 /* finally update cached route in each socket via kpfctlinput */
2359 {
2360 struct sockaddr_in6 sdst;
2361
2362 bzero(&sdst, sizeof(sdst));
2363 sdst.sin6_family = AF_INET6;
2364 sdst.sin6_len = sizeof(struct sockaddr_in6);
2365 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2366 kpfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2367 #ifdef IPSEC
2368 key_sa_routechange((struct sockaddr *)&sdst);
2369 #endif
2370 }
2371
2372 freeit:
2373 m_freem(m);
2374 return;
2375
2376 bad:
2377 icmp6stat.icp6s_badredirect++;
2378 m_freem(m);
2379 }
2380
2381 void
2382 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
2383 {
2384 struct ifnet *ifp; /* my outgoing interface */
2385 struct in6_addr *ifp_ll6;
2386 struct in6_addr *router_ll6;
2387 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2388 struct mbuf *m = NULL; /* newly allocated one */
2389 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2390 struct nd_redirect *nd_rd;
2391 size_t maxlen;
2392 u_char *p;
2393 struct ifnet *outif = NULL;
2394 struct sockaddr_in6 src_sa;
2395
2396 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2397
2398 /* if we are not router, we don't send icmp6 redirect */
2399 if (!ip6_forwarding || ip6_accept_rtadv)
2400 goto fail;
2401
2402 /* sanity check */
2403 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2404 goto fail;
2405
2406 /*
2407 * Address check:
2408 * the source address must identify a neighbor, and
2409 * the destination address must not be a multicast address
2410 * [RFC 2461, sec 8.2]
2411 */
2412 sip6 = mtod(m0, struct ip6_hdr *);
2413 bzero(&src_sa, sizeof(src_sa));
2414 src_sa.sin6_family = AF_INET6;
2415 src_sa.sin6_len = sizeof(src_sa);
2416 src_sa.sin6_addr = sip6->ip6_src;
2417 /* we don't currently use sin6_scope_id, but eventually use it */
2418 if (in6_addr2zoneid(ifp, &sip6->ip6_src, &src_sa.sin6_scope_id))
2419 goto fail;
2420 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2421 goto fail;
2422 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2423 goto fail; /* what should we do here? */
2424
2425 /* rate limit */
2426 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2427 goto fail;
2428
2429 /*
2430 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2431 * we almost always ask for an mbuf cluster for simplicity.
2432 * (MHLEN < IPV6_MMTU is almost always true)
2433 */
2434 #if IPV6_MMTU >= MCLBYTES
2435 # error assumption failed about IPV6_MMTU and MCLBYTES
2436 #endif
2437 m = m_getb(IPV6_MMTU, M_NOWAIT, MT_HEADER, M_PKTHDR);
2438 if (!m)
2439 goto fail;
2440 m->m_len = 0;
2441 maxlen = M_TRAILINGSPACE(m);
2442 maxlen = min(IPV6_MMTU, maxlen);
2443 /* just for safety */
2444 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2445 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2446 goto fail;
2447 }
2448
2449 {
2450 /* get ip6 linklocal address for ifp(my outgoing interface). */
2451 struct in6_ifaddr *ia;
2452 if ((ia = in6ifa_ifpforlinklocal(ifp,
2453 IN6_IFF_NOTREADY|
2454 IN6_IFF_ANYCAST)) == NULL)
2455 goto fail;
2456 ifp_ll6 = &ia->ia_addr.sin6_addr;
2457 }
2458
2459 /* get ip6 linklocal address for the router. */
2460 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2461 struct sockaddr_in6 *sin6;
2462 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2463 router_ll6 = &sin6->sin6_addr;
2464 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2465 router_ll6 = NULL;
2466 } else
2467 router_ll6 = NULL;
2468
2469 /* ip6 */
2470 ip6 = mtod(m, struct ip6_hdr *);
2471 ip6->ip6_flow = 0;
2472 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2473 ip6->ip6_vfc |= IPV6_VERSION;
2474 /* ip6->ip6_plen will be set later */
2475 ip6->ip6_nxt = IPPROTO_ICMPV6;
2476 ip6->ip6_hlim = 255;
2477 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2478 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2479 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2480
2481 /* ND Redirect */
2482 nd_rd = (struct nd_redirect *)(ip6 + 1);
2483 nd_rd->nd_rd_type = ND_REDIRECT;
2484 nd_rd->nd_rd_code = 0;
2485 nd_rd->nd_rd_reserved = 0;
2486 if (rt->rt_flags & RTF_GATEWAY) {
2487 /*
2488 * nd_rd->nd_rd_target must be a link-local address in
2489 * better router cases.
2490 */
2491 if (!router_ll6)
2492 goto fail;
2493 bcopy(router_ll6, &nd_rd->nd_rd_target,
2494 sizeof(nd_rd->nd_rd_target));
2495 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2496 sizeof(nd_rd->nd_rd_dst));
2497 } else {
2498 /* make sure redtgt == reddst */
2499 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2500 sizeof(nd_rd->nd_rd_target));
2501 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2502 sizeof(nd_rd->nd_rd_dst));
2503 }
2504
2505 p = (u_char *)(nd_rd + 1);
2506
2507 if (!router_ll6)
2508 goto nolladdropt;
2509
2510 {
2511 /* target lladdr option */
2512 struct rtentry *rt_router = NULL;
2513 int len;
2514 struct sockaddr_dl *sdl;
2515 struct nd_opt_hdr *nd_opt;
2516 char *lladdr;
2517
2518 rt_router = nd6_lookup(router_ll6, 0, ifp);
2519 if (!rt_router)
2520 goto nolladdropt;
2521 len = sizeof(*nd_opt) + ifp->if_addrlen;
2522 len = (len + 7) & ~7; /* round by 8 */
2523 /* safety check */
2524 if (len + (p - (u_char *)ip6) > maxlen)
2525 goto nolladdropt;
2526 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2527 (rt_router->rt_flags & RTF_LLINFO) &&
2528 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2529 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
2530 sdl->sdl_alen) {
2531 nd_opt = (struct nd_opt_hdr *)p;
2532 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2533 nd_opt->nd_opt_len = len >> 3;
2534 lladdr = (char *)(nd_opt + 1);
2535 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2536 p += len;
2537 }
2538 }
2539 nolladdropt:;
2540
2541 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2542
2543 /* just to be safe */
2544 #ifdef M_DECRYPTED /*not openbsd*/
2545 if (m0->m_flags & M_DECRYPTED)
2546 goto noredhdropt;
2547 #endif
2548 if (p - (u_char *)ip6 > maxlen)
2549 goto noredhdropt;
2550
2551 {
2552 /* redirected header option */
2553 int len;
2554 struct nd_opt_rd_hdr *nd_opt_rh;
2555
2556 /*
2557 * compute the maximum size for icmp6 redirect header option.
2558 * XXX room for auth header?
2559 */
2560 len = maxlen - (p - (u_char *)ip6);
2561 len &= ~7;
2562
2563 /* This is just for simplicity. */
2564 if (m0->m_pkthdr.len != m0->m_len) {
2565 if (m0->m_next) {
2566 m_freem(m0->m_next);
2567 m0->m_next = NULL;
2568 }
2569 m0->m_pkthdr.len = m0->m_len;
2570 }
2571
2572 /*
2573 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2574 * about padding/truncate rule for the original IP packet.
2575 * From the discussion on IPv6imp in Feb 1999, the consensus was:
2576 * - "attach as much as possible" is the goal
2577 * - pad if not aligned (original size can be guessed by original
2578 * ip6 header)
2579 * Following code adds the padding if it is simple enough,
2580 * and truncates if not.
2581 */
2582 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2583 panic("assumption failed in %s:%d", __FILE__, __LINE__);
2584
2585 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2586 /* not enough room, truncate */
2587 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2588 } else {
2589 /* enough room, pad or truncate */
2590 size_t extra;
2591
2592 extra = m0->m_pkthdr.len % 8;
2593 if (extra) {
2594 /* pad if easy enough, truncate if not */
2595 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2596 /* pad */
2597 m0->m_len += (8 - extra);
2598 m0->m_pkthdr.len += (8 - extra);
2599 } else {
2600 /* truncate */
2601 m0->m_pkthdr.len -= extra;
2602 m0->m_len -= extra;
2603 }
2604 }
2605 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2606 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2607 }
2608
2609 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2610 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2611 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2612 nd_opt_rh->nd_opt_rh_len = len >> 3;
2613 p += sizeof(*nd_opt_rh);
2614 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2615
2616 /* connect m0 to m */
2617 m->m_next = m0;
2618 m->m_pkthdr.len = m->m_len + m0->m_len;
2619 m0 = NULL;
2620 }
2621 noredhdropt:;
2622 if (m0 != NULL) {
2623 m_freem(m0);
2624 m0 = NULL;
2625 }
2626
2627 /* XXX: clear embedded link IDs in the inner header */
2628 in6_clearscope(&sip6->ip6_src);
2629 in6_clearscope(&sip6->ip6_dst);
2630 in6_clearscope(&nd_rd->nd_rd_target);
2631 in6_clearscope(&nd_rd->nd_rd_dst);
2632
2633 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2634
2635 nd_rd->nd_rd_cksum = 0;
2636 nd_rd->nd_rd_cksum
2637 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2638
2639 /* send the packet to outside... */
2640 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2641 if (outif) {
2642 icmp6_ifstat_inc(outif, ifs6_out_msg);
2643 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2644 }
2645 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2646
2647 return;
2648
2649 fail:
2650 if (m)
2651 m_freem(m);
2652 if (m0)
2653 m_freem(m0);
2654 }
2655
2656 #ifdef HAVE_NRL_INPCB
2657 #define in6pcb inpcb
2658 #define in6p_icmp6filt inp_icmp6filt
2659 #endif
2660 /*
2661 * ICMPv6 socket option processing.
2662 */
2663 void
2664 icmp6_ctloutput(netmsg_t msg)
2665 {
2666 struct socket *so = msg->ctloutput.base.nm_so;
2667 struct sockopt *sopt = msg->ctloutput.nm_sopt;
2668 int error = 0;
2669 int optlen;
2670 struct inpcb *inp = so->so_pcb;
2671 int level, op, optname;
2672
2673 if (sopt) {
2674 level = sopt->sopt_level;
2675 op = sopt->sopt_dir;
2676 optname = sopt->sopt_name;
2677 optlen = sopt->sopt_valsize;
2678 } else
2679 level = op = optname = optlen = 0;
2680
2681 if (level != IPPROTO_ICMPV6) {
2682 error = EINVAL;
2683 goto out;
2684 }
2685
2686 switch (op) {
2687 case PRCO_SETOPT:
2688 switch (optname) {
2689 case ICMP6_FILTER:
2690 {
2691 if (optlen != sizeof(struct icmp6_filter)) {
2692 error = EMSGSIZE;
2693 break;
2694 }
2695 if (inp->in6p_icmp6filt == NULL) {
2696 error = EINVAL;
2697 break;
2698 }
2699 error = soopt_to_kbuf(sopt, inp->in6p_icmp6filt, optlen,
2700 optlen);
2701 break;
2702 }
2703
2704 default:
2705 error = ENOPROTOOPT;
2706 break;
2707 }
2708 break;
2709
2710 case PRCO_GETOPT:
2711 switch (optname) {
2712 case ICMP6_FILTER:
2713 {
2714 if (inp->in6p_icmp6filt == NULL) {
2715 error = EINVAL;
2716 break;
2717 }
2718 soopt_from_kbuf(sopt, inp->in6p_icmp6filt,
2719 sizeof(struct icmp6_filter));
2720 break;
2721 }
2722
2723 default:
2724 error = ENOPROTOOPT;
2725 break;
2726 }
2727 break;
2728 }
2729 out:
2730 lwkt_replymsg(&msg->ctloutput.base.lmsg, error);
2731 }
2732 #ifdef HAVE_NRL_INPCB
2733 #undef in6pcb
2734 #undef in6p_icmp6filt
2735 #endif
2736
2737 #ifndef HAVE_PPSRATECHECK
2738 #ifndef timersub
2739 #define timersub(tvp, uvp, vvp) \
2740 do { \
2741 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
2742 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
2743 if ((vvp)->tv_usec < 0) { \
2744 (vvp)->tv_sec--; \
2745 (vvp)->tv_usec += 1000000; \
2746 } \
2747 } while (0)
2748 #endif
2749
2750 /*
2751 * ppsratecheck(): packets (or events) per second limitation.
2752 */
2753 static int
2754 ppsratecheck(struct timeval *lasttime, int *curpps,
2755 int maxpps) /* maximum pps allowed */
2756 {
2757 struct timeval tv, delta;
2758 int rv;
2759
2760 microtime(&tv);
2761
2762 timersub(&tv, lasttime, &delta);
2763
2764 /*
2765 * Check for 0,0 so that the message will be seen at least once.
2766 * If more than one second has passed since the last update of
2767 * lasttime, reset the counter.
2768 *
2769 * We do increment *curpps even in *curpps < maxpps case, as some may
2770 * try to use *curpps for stat purposes as well.
2771 */
2772 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
2773 delta.tv_sec >= 1) {
2774 *lasttime = tv;
2775 *curpps = 0;
2776 rv = 1;
2777 } else if (maxpps < 0)
2778 rv = 1;
2779 else if (*curpps < maxpps)
2780 rv = 1;
2781 else
2782 rv = 0;
2783
2784 #if 1 /* DIAGNOSTIC? */
2785 /* be careful about wrap-around */
2786 if (*curpps + 1 > *curpps)
2787 *curpps = *curpps + 1;
2788 #else
2789 /*
2790 * assume that there's not too many calls to this function.
2791 * not sure if the assumption holds, as it depends on *caller's*
2792 * behavior, not the behavior of this function.
2793 * IMHO it is wrong to make assumption on the caller's behavior,
2794 * so the above #if is #if 1, not #ifdef DIAGNOSTIC.
2795 */
2796 *curpps = *curpps + 1;
2797 #endif
2798
2799 return (rv);
2800 }
2801 #endif
2802
2803 /*
2804 * Perform rate limit check.
2805 * Returns 0 if it is okay to send the icmp6 packet.
2806 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2807 * limitation.
2808 *
2809 * XXX per-destination/type check necessary?
2810 */
2811 static int
2812 icmp6_ratelimit(const struct in6_addr *dst, /* not used at this moment */
2813 const int type, /* not used at this moment */
2814 const int code) /* not used at this moment */
2815 {
2816 int ret;
2817
2818 ret = 0; /* okay to send */
2819
2820 /* PPS limit */
2821 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2822 icmp6errppslim)) {
2823 /* The packet is subject to rate limit */
2824 ret++;
2825 }
2826
2827 return ret;
2828 }
DragonFly BSD