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Remove IPsec and related code from the system.
[dragonfly.git] / sys / netinet6 / icmp6.c
blobe5840f77669f2dcc65b7760a6d1221d2f1b7da90
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
67 #include <sys/param.h>
68 #include <sys/systm.h>
69 #include <sys/malloc.h>
70 #include <sys/mbuf.h>
71 #include <sys/protosw.h>
72 #include <sys/socket.h>
73 #include <sys/socketvar.h>
74 #include <sys/socketops.h>
75 #include <sys/time.h>
76 #include <sys/kernel.h>
77 #include <sys/syslog.h>
78 #include <sys/domain.h>
79
80 #include <sys/thread2.h>
81 #include <sys/msgport2.h>
82
83 #include <net/if.h>
84 #include <net/route.h>
85 #include <net/if_dl.h>
86 #include <net/if_types.h>
87 #include <net/netisr2.h>
88 #include <net/netmsg2.h>
89
90 #include <netinet/in.h>
91 #include <netinet/in_var.h>
92 #include <netinet/ip6.h>
93 #include <netinet6/ip6_var.h>
94 #include <netinet/icmp6.h>
95 #include <netinet6/mld6_var.h>
96 #include <netinet/in_pcb.h>
97 #include <netinet6/in6_pcb.h>
98 #include <netinet6/nd6.h>
99 #include <netinet6/in6_ifattach.h>
100 #include <netinet6/ip6protosw.h>
101
102 #include <net/net_osdep.h>
103
104 #ifdef HAVE_NRL_INPCB
105 /* inpcb members */
106 #define in6pcb inpcb
107 #define in6p_laddr inp_laddr6
108 #define in6p_faddr inp_faddr6
109 #define in6p_icmp6filt inp_icmp6filt
110 #define in6p_route inp_route
111 #define in6p_socket inp_socket
112 #define in6p_flags inp_flags
113 #define in6p_moptions inp_moptions6
114 #define in6p_outputopts inp_outputopts6
115 #define in6p_ip6 inp_ipv6
116 #define in6p_flowinfo inp_flowinfo
117 #define in6p_next inp_next
118 #define in6p_prev inp_prev
119 /* function names */
120 #define in6_pcbdetach in_pcbdetach
121 #define in6_rtchange in_rtchange
122
123 /*
124 * for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from
125 * others...
126 */
127 #define in6p_ip6_nxt inp_ipv6.ip6_nxt
128 #endif
129
130 #define ICMP6_FASTTIMO (hz / PR_FASTHZ)
131
132 /*
133 * ppratecheck() is available, so define it here.
134 */
135 #define HAVE_PPSRATECHECK
136
137 extern struct domain inet6domain;
138 extern struct protosw inet6sw[];
139 extern u_char ip6_protox[];
140
141 struct icmp6stat icmp6stat;
142
143 extern struct inpcbinfo ripcbinfo;
144 extern int icmp6errppslim;
145 static int icmp6errpps_count = 0;
146 static struct timeval icmp6errppslim_last;
147 extern int icmp6_nodeinfo;
148
149 static void icmp6_errcount (struct icmp6errstat *, int, int);
150 static int icmp6_rip6_input (struct mbuf **, int);
151 static int icmp6_ratelimit (const struct in6_addr *, const int, const int);
152 static const char *icmp6_redirect_diag (struct in6_addr *,
153 struct in6_addr *, struct in6_addr *);
154 #ifndef HAVE_PPSRATECHECK
155 static int ppsratecheck (struct timeval *, int *, int);
156 #endif
157 static struct mbuf *ni6_input (struct mbuf *, int);
158 static struct mbuf *ni6_nametodns (const char *, int, int);
159 static int ni6_dnsmatch (const char *, int, const char *, int);
160 static int ni6_addrs (struct icmp6_nodeinfo *, struct mbuf *,
161 struct ifnet **, char *);
162 static int ni6_store_addrs (struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
163 struct ifnet *, int);
164 static int icmp6_notify_error (struct mbuf *, int, int, int);
165
166 static void icmp6_fasttimo(void *);
167 static void icmp6_fasttimo_dispatch(netmsg_t);
168
169 #ifdef COMPAT_RFC1885
170 static struct route_in6 icmp6_reflect_rt;
171 #endif
172
173 static struct callout icmp6_fasttimo_ch;
174 static struct netmsg_base icmp6_fasttimo_nmsg;
175
176 void
177 icmp6_init(void)
178 {
179
180 mld6_init();
181
182 callout_init_mp(&icmp6_fasttimo_ch);
183 netmsg_init(&icmp6_fasttimo_nmsg, NULL, &netisr_adone_rport,
184 MSGF_PRIORITY, icmp6_fasttimo_dispatch);
185
186 callout_reset_bycpu(&icmp6_fasttimo_ch, ICMP6_FASTTIMO,
187 icmp6_fasttimo, NULL, 0);
188 }
189
190 static void
191 icmp6_errcount(struct icmp6errstat *stat, int type, int code)
192 {
193 switch (type) {
194 case ICMP6_DST_UNREACH:
195 switch (code) {
196 case ICMP6_DST_UNREACH_NOROUTE:
197 stat->icp6errs_dst_unreach_noroute++;
198 return;
199 case ICMP6_DST_UNREACH_ADMIN:
200 stat->icp6errs_dst_unreach_admin++;
201 return;
202 case ICMP6_DST_UNREACH_BEYONDSCOPE:
203 stat->icp6errs_dst_unreach_beyondscope++;
204 return;
205 case ICMP6_DST_UNREACH_ADDR:
206 stat->icp6errs_dst_unreach_addr++;
207 return;
208 case ICMP6_DST_UNREACH_NOPORT:
209 stat->icp6errs_dst_unreach_noport++;
210 return;
211 }
212 break;
213 case ICMP6_PACKET_TOO_BIG:
214 stat->icp6errs_packet_too_big++;
215 return;
216 case ICMP6_TIME_EXCEEDED:
217 switch (code) {
218 case ICMP6_TIME_EXCEED_TRANSIT:
219 stat->icp6errs_time_exceed_transit++;
220 return;
221 case ICMP6_TIME_EXCEED_REASSEMBLY:
222 stat->icp6errs_time_exceed_reassembly++;
223 return;
224 }
225 break;
226 case ICMP6_PARAM_PROB:
227 switch (code) {
228 case ICMP6_PARAMPROB_HEADER:
229 stat->icp6errs_paramprob_header++;
230 return;
231 case ICMP6_PARAMPROB_NEXTHEADER:
232 stat->icp6errs_paramprob_nextheader++;
233 return;
234 case ICMP6_PARAMPROB_OPTION:
235 stat->icp6errs_paramprob_option++;
236 return;
237 }
238 break;
239 case ND_REDIRECT:
240 stat->icp6errs_redirect++;
241 return;
242 }
243 stat->icp6errs_unknown++;
244 }
245
246 /*
247 * Generate an error packet of type error in response to bad IP6 packet.
248 */
249 void
250 icmp6_error(struct mbuf *m, int type, int code, int param)
251 {
252 struct ip6_hdr *oip6, *nip6;
253 struct icmp6_hdr *icmp6;
254 u_int preplen;
255 int off;
256 int nxt;
257
258 icmp6stat.icp6s_error++;
259
260 /* count per-type-code statistics */
261 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
262
263 #ifdef M_DECRYPTED /*not openbsd*/
264 if (m->m_flags & M_DECRYPTED) {
265 icmp6stat.icp6s_canterror++;
266 goto freeit;
267 }
268 #endif
269
270 #ifndef PULLDOWN_TEST
271 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
272 #else
273 if (m->m_len < sizeof(struct ip6_hdr)) {
274 m = m_pullup(m, sizeof(struct ip6_hdr));
275 if (m == NULL)
276 return;
277 }
278 #endif
279 oip6 = mtod(m, struct ip6_hdr *);
280
281 /*
282 * Multicast destination check. For unrecognized option errors,
283 * this check has already done in ip6_unknown_opt(), so we can
284 * check only for other errors.
285 */
286 if ((m->m_flags & (M_BCAST|M_MCAST) ||
287 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
288 (type != ICMP6_PACKET_TOO_BIG &&
289 (type != ICMP6_PARAM_PROB ||
290 code != ICMP6_PARAMPROB_OPTION)))
291 goto freeit;
292
293 /* Source address check. XXX: the case of anycast source? */
294 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
295 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
296 goto freeit;
297
298 /*
299 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
300 * don't do it.
301 */
302 nxt = -1;
303 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
304 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
305 struct icmp6_hdr *icp;
306
307 #ifndef PULLDOWN_TEST
308 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
309 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
310 #else
311 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
312 sizeof(*icp));
313 if (icp == NULL) {
314 icmp6stat.icp6s_tooshort++;
315 return;
316 }
317 #endif
318 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
319 icp->icmp6_type == ND_REDIRECT) {
320 /*
321 * ICMPv6 error
322 * Special case: for redirect (which is
323 * informational) we must not send icmp6 error.
324 */
325 icmp6stat.icp6s_canterror++;
326 goto freeit;
327 } else {
328 /* ICMPv6 informational - send the error */
329 }
330 } else {
331 /* non-ICMPv6 - send the error */
332 }
333
334 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
335
336 /* Finally, do rate limitation check. */
337 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
338 icmp6stat.icp6s_toofreq++;
339 goto freeit;
340 }
341
342 /*
343 * OK, ICMP6 can be generated.
344 */
345
346 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
347 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
348
349 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
350 M_PREPEND(m, preplen, M_NOWAIT);
351 if (m && m->m_len < preplen)
352 m = m_pullup(m, preplen);
353 if (m == NULL) {
354 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
355 return;
356 }
357
358 nip6 = mtod(m, struct ip6_hdr *);
359 nip6->ip6_src = oip6->ip6_src;
360 nip6->ip6_dst = oip6->ip6_dst;
361
362 in6_clearscope(&oip6->ip6_src);
363 in6_clearscope(&oip6->ip6_dst);
364
365 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
366 icmp6->icmp6_type = type;
367 icmp6->icmp6_code = code;
368 icmp6->icmp6_pptr = htonl((u_int32_t)param);
369
370 /*
371 * icmp6_reflect() is designed to be in the input path.
372 * icmp6_error() can be called from both input and outut path,
373 * and if we are in output path rcvif could contain bogus value.
374 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
375 * information in ip header (nip6).
376 */
377 m->m_pkthdr.rcvif = NULL;
378
379 icmp6stat.icp6s_outhist[type]++;
380 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
381
382 return;
383
384 freeit:
385 /*
386 * If we can't tell wheter or not we can generate ICMP6, free it.
387 */
388 m_freem(m);
389 }
390
391 /*
392 * Process a received ICMP6 message.
393 */
394 int
395 icmp6_input(struct mbuf **mp, int *offp, int proto)
396 {
397 struct mbuf *m = *mp, *n;
398 struct ip6_hdr *ip6, *nip6;
399 struct icmp6_hdr *icmp6, *nicmp6;
400 int off = *offp;
401 int icmp6len = m->m_pkthdr.len - *offp;
402 int code, sum, noff;
403
404 #ifndef PULLDOWN_TEST
405 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
406 /* m might change if M_LOOP. So, call mtod after this */
407 #endif
408
409 /*
410 * Locate icmp6 structure in mbuf, and check
411 * that not corrupted and of at least minimum length
412 */
413
414 ip6 = mtod(m, struct ip6_hdr *);
415 if (icmp6len < sizeof(struct icmp6_hdr)) {
416 icmp6stat.icp6s_tooshort++;
417 goto freeit;
418 }
419
420 /*
421 * calculate the checksum
422 */
423 #ifndef PULLDOWN_TEST
424 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
425 #else
426 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
427 if (icmp6 == NULL) {
428 icmp6stat.icp6s_tooshort++;
429 return IPPROTO_DONE;
430 }
431 #endif
432 code = icmp6->icmp6_code;
433
434 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
435 nd6log((LOG_ERR,
436 "ICMP6 checksum error(%d|%x) %s\n",
437 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
438 icmp6stat.icp6s_checksum++;
439 goto freeit;
440 }
441
442 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
443 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
444 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
445 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
446
447 switch (icmp6->icmp6_type) {
448 case ICMP6_DST_UNREACH:
449 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
450 switch (code) {
451 case ICMP6_DST_UNREACH_NOROUTE:
452 code = PRC_UNREACH_NET;
453 break;
454 case ICMP6_DST_UNREACH_ADMIN:
455 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
456 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
457 break;
458 case ICMP6_DST_UNREACH_ADDR:
459 code = PRC_HOSTDEAD;
460 break;
461 #ifdef COMPAT_RFC1885
462 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
463 code = PRC_UNREACH_SRCFAIL;
464 break;
465 #else
466 case ICMP6_DST_UNREACH_BEYONDSCOPE:
467 /* I mean "source address was incorrect." */
468 code = PRC_PARAMPROB;
469 break;
470 #endif
471 case ICMP6_DST_UNREACH_NOPORT:
472 code = PRC_UNREACH_PORT;
473 break;
474 default:
475 goto badcode;
476 }
477 goto deliver;
478 break;
479
480 case ICMP6_PACKET_TOO_BIG:
481 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
482 if (code != 0)
483 goto badcode;
484
485 code = PRC_MSGSIZE;
486
487 /*
488 * Updating the path MTU will be done after examining
489 * intermediate extension headers.
490 */
491 goto deliver;
492 break;
493
494 case ICMP6_TIME_EXCEEDED:
495 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
496 switch (code) {
497 case ICMP6_TIME_EXCEED_TRANSIT:
498 case ICMP6_TIME_EXCEED_REASSEMBLY:
499 code += PRC_TIMXCEED_INTRANS;
500 break;
501 default:
502 goto badcode;
503 }
504 goto deliver;
505 break;
506
507 case ICMP6_PARAM_PROB:
508 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
509 switch (code) {
510 case ICMP6_PARAMPROB_NEXTHEADER:
511 code = PRC_UNREACH_PROTOCOL;
512 break;
513 case ICMP6_PARAMPROB_HEADER:
514 case ICMP6_PARAMPROB_OPTION:
515 code = PRC_PARAMPROB;
516 break;
517 default:
518 goto badcode;
519 }
520 goto deliver;
521 break;
522
523 case ICMP6_ECHO_REQUEST:
524 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
525 if (code != 0)
526 goto badcode;
527 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
528 /* Give up remote */
529 break;
530 }
531 if ((n->m_flags & M_EXT) ||
532 n->m_len < off + sizeof(struct icmp6_hdr)) {
533 struct mbuf *n0 = n;
534 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
535 int n0len;
536
537 /*
538 * Prepare an internal mbuf. m_pullup() doesn't
539 * always copy the length we specified.
540 */
541 if (maxlen >= MCLBYTES) {
542 /* Give up remote */
543 m_freem(n0);
544 break;
545 }
546 n = m_getb(maxlen, M_NOWAIT, n0->m_type, M_PKTHDR);
547 if (n == NULL) {
548 /* Give up remote */
549 m_freem(n0);
550 break;
551 }
552 n0len = n0->m_pkthdr.len; /* save for use below */
553 M_MOVE_PKTHDR(n, n0);
554 /*
555 * Copy IPv6 and ICMPv6 only.
556 */
557 nip6 = mtod(n, struct ip6_hdr *);
558 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
559 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
560 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
561 noff = sizeof(struct ip6_hdr);
562 /* new mbuf contains only ipv6+icmpv6 headers */
563 n->m_len = noff + sizeof(struct icmp6_hdr);
564 /*
565 * Adjust mbuf. ip6_plen will be adjusted in
566 * ip6_output().
567 */
568 m_adj(n0, off + sizeof(struct icmp6_hdr));
569 /* recalculate complete packet size */
570 n->m_pkthdr.len = n0len + (noff - off);
571 n->m_next = n0;
572 } else {
573 nip6 = mtod(n, struct ip6_hdr *);
574 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off);
575 noff = off;
576 }
577 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
578 nicmp6->icmp6_code = 0;
579 if (n) {
580 icmp6stat.icp6s_reflect++;
581 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
582 icmp6_reflect(n, noff);
583 }
584 break;
585
586 case ICMP6_ECHO_REPLY:
587 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
588 if (code != 0)
589 goto badcode;
590 break;
591
592 case MLD_LISTENER_QUERY:
593 case MLD_LISTENER_REPORT:
594 if (icmp6len < sizeof(struct mld_hdr))
595 goto badlen;
596 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
597 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
598 else
599 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
600 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
601 /* give up local */
602 mld6_input(m, off);
603 m = NULL;
604 goto freeit;
605 }
606 mld6_input(n, off);
607 /* m stays. */
608 break;
609
610 case MLD_LISTENER_DONE:
611 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
612 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
613 goto badlen;
614 break; /* nothing to be done in kernel */
615
616 case MLD_MTRACE_RESP:
617 case MLD_MTRACE:
618 /* XXX: these two are experimental. not officially defind. */
619 /* XXX: per-interface statistics? */
620 break; /* just pass it to applications */
621
622 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
623 {
624 enum { WRU, FQDN } mode;
625
626 if (!icmp6_nodeinfo)
627 break;
628
629 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
630 mode = WRU;
631 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
632 mode = FQDN;
633 else
634 goto badlen;
635
636 #define hostnamelen strlen(hostname)
637 if (mode == FQDN) {
638 #ifndef PULLDOWN_TEST
639 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
640 IPPROTO_DONE);
641 #endif
642 n = m_copy(m, 0, M_COPYALL);
643 if (n)
644 n = ni6_input(n, off);
645 /* XXX meaningless if n == NULL */
646 noff = sizeof(struct ip6_hdr);
647 } else {
648 u_char *p;
649 int maxlen, maxhlen;
650
651 if ((icmp6_nodeinfo & 5) != 5)
652 break;
653
654 if (code != 0)
655 goto badcode;
656 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
657 if (maxlen >= MCLBYTES) {
658 /* Give up remote */
659 break;
660 }
661 n = m_getb(maxlen, M_NOWAIT, m->m_type, M_PKTHDR);
662 if (n == NULL) {
663 /* Give up remote */
664 break;
665 }
666 if (!m_dup_pkthdr(n, m, M_NOWAIT)) {
667 /*
668 * Previous code did a blind M_COPY_PKTHDR
669 * and said "just for rcvif". If true, then
670 * we could tolerate the dup failing (due to
671 * the deep copy of the tag chain). For now
672 * be conservative and just fail.
673 */
674 m_free(n);
675 break;
676 }
677 n->m_len = 0;
678 maxhlen = M_TRAILINGSPACE(n) - maxlen;
679 if (maxhlen > hostnamelen)
680 maxhlen = hostnamelen;
681 /*
682 * Copy IPv6 and ICMPv6 only.
683 */
684 nip6 = mtod(n, struct ip6_hdr *);
685 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
686 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
687 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
688 p = (u_char *)(nicmp6 + 1);
689 bzero(p, 4);
690 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
691 noff = sizeof(struct ip6_hdr);
692 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
693 sizeof(struct icmp6_hdr) + 4 + maxhlen;
694 nicmp6->icmp6_type = ICMP6_WRUREPLY;
695 nicmp6->icmp6_code = 0;
696 }
697 #undef hostnamelen
698 if (n) {
699 icmp6stat.icp6s_reflect++;
700 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
701 icmp6_reflect(n, noff);
702 }
703 break;
704 }
705
706 case ICMP6_WRUREPLY:
707 if (code != 0)
708 goto badcode;
709 break;
710
711 case ND_ROUTER_SOLICIT:
712 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
713 if (code != 0)
714 goto badcode;
715 if (icmp6len < sizeof(struct nd_router_solicit))
716 goto badlen;
717 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
718 /* give up local */
719 nd6_rs_input(m, off, icmp6len);
720 m = NULL;
721 goto freeit;
722 }
723 nd6_rs_input(n, off, icmp6len);
724 /* m stays. */
725 break;
726
727 case ND_ROUTER_ADVERT:
728 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
729 if (code != 0)
730 goto badcode;
731 if (icmp6len < sizeof(struct nd_router_advert))
732 goto badlen;
733 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
734 /* give up local */
735 nd6_ra_input(m, off, icmp6len);
736 m = NULL;
737 goto freeit;
738 }
739 nd6_ra_input(n, off, icmp6len);
740 /* m stays. */
741 break;
742
743 case ND_NEIGHBOR_SOLICIT:
744 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
745 if (code != 0)
746 goto badcode;
747 if (icmp6len < sizeof(struct nd_neighbor_solicit))
748 goto badlen;
749 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
750 /* give up local */
751 nd6_ns_input(m, off, icmp6len);
752 m = NULL;
753 goto freeit;
754 }
755 nd6_ns_input(n, off, icmp6len);
756 /* m stays. */
757 break;
758
759 case ND_NEIGHBOR_ADVERT:
760 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
761 if (code != 0)
762 goto badcode;
763 if (icmp6len < sizeof(struct nd_neighbor_advert))
764 goto badlen;
765 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
766 /* give up local */
767 nd6_na_input(m, off, icmp6len);
768 m = NULL;
769 goto freeit;
770 }
771 nd6_na_input(n, off, icmp6len);
772 /* m stays. */
773 break;
774
775 case ND_REDIRECT:
776 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
777 if (code != 0)
778 goto badcode;
779 if (icmp6len < sizeof(struct nd_redirect))
780 goto badlen;
781 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
782 /* give up local */
783 icmp6_redirect_input(m, off);
784 m = NULL;
785 goto freeit;
786 }
787 icmp6_redirect_input(n, off);
788 /* m stays. */
789 break;
790
791 case ICMP6_ROUTER_RENUMBERING:
792 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
793 code != ICMP6_ROUTER_RENUMBERING_RESULT)
794 goto badcode;
795 if (icmp6len < sizeof(struct icmp6_router_renum))
796 goto badlen;
797 break;
798
799 default:
800 nd6log((LOG_DEBUG,
801 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
802 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
803 ip6_sprintf(&ip6->ip6_dst),
804 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
805 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
806 /* ICMPv6 error: MUST deliver it by spec... */
807 code = PRC_NCMDS;
808 /* deliver */
809 } else {
810 /* ICMPv6 informational: MUST not deliver */
811 break;
812 }
813 deliver:
814 if (icmp6_notify_error(m, off, icmp6len, code)) {
815 /* In this case, m should've been freed. */
816 return (IPPROTO_DONE);
817 }
818 break;
819
820 badcode:
821 icmp6stat.icp6s_badcode++;
822 break;
823
824 badlen:
825 icmp6stat.icp6s_badlen++;
826 break;
827 }
828
829 /* deliver the packet to appropriate sockets */
830 icmp6_rip6_input(&m, *offp);
831
832 return IPPROTO_DONE;
833
834 freeit:
835 m_freem(m);
836 return IPPROTO_DONE;
837 }
838
839 static int
840 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code)
841 {
842 struct icmp6_hdr *icmp6;
843 struct ip6_hdr *eip6;
844 u_int32_t notifymtu;
845 struct sockaddr_in6 icmp6src, icmp6dst;
846
847 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
848 icmp6stat.icp6s_tooshort++;
849 goto freeit;
850 }
851 #ifndef PULLDOWN_TEST
852 IP6_EXTHDR_CHECK(m, off,
853 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
854 -1);
855 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
856 #else
857 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
858 sizeof(*icmp6) + sizeof(struct ip6_hdr));
859 if (icmp6 == NULL) {
860 icmp6stat.icp6s_tooshort++;
861 return (-1);
862 }
863 #endif
864 eip6 = (struct ip6_hdr *)(icmp6 + 1);
865
866 /* Detect the upper level protocol */
867 {
868 u_int8_t nxt = eip6->ip6_nxt;
869 int eoff = off + sizeof(struct icmp6_hdr) +
870 sizeof(struct ip6_hdr);
871 struct ip6ctlparam ip6cp;
872 struct in6_addr *finaldst = NULL;
873 int icmp6type = icmp6->icmp6_type;
874 struct ip6_frag *fh;
875 struct ip6_rthdr *rth;
876 int rthlen;
877
878 while (1) { /* XXX: should avoid infinite loop explicitly? */
879 struct ip6_ext *eh;
880
881 switch (nxt) {
882 case IPPROTO_HOPOPTS:
883 case IPPROTO_DSTOPTS:
884 case IPPROTO_AH:
885 #ifndef PULLDOWN_TEST
886 IP6_EXTHDR_CHECK(m, 0,
887 eoff + sizeof(struct ip6_ext), -1);
888 eh = (struct ip6_ext *)
889 (mtod(m, caddr_t) + eoff);
890 #else
891 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
892 eoff, sizeof(*eh));
893 if (eh == NULL) {
894 icmp6stat.icp6s_tooshort++;
895 return (-1);
896 }
897 #endif
898
899 if (nxt == IPPROTO_AH)
900 eoff += (eh->ip6e_len + 2) << 2;
901 else
902 eoff += (eh->ip6e_len + 1) << 3;
903 nxt = eh->ip6e_nxt;
904 break;
905 case IPPROTO_ROUTING:
906 /*
907 * When the erroneous packet contains a
908 * routing header, we should examine the
909 * header to determine the final destination.
910 * Otherwise, we can't properly update
911 * information that depends on the final
912 * destination (e.g. path MTU).
913 */
914 #ifndef PULLDOWN_TEST
915 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
916 -1);
917 rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
918 + eoff);
919 #else
920 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
921 eoff, sizeof(*rth));
922 if (rth == NULL) {
923 icmp6stat.icp6s_tooshort++;
924 return (-1);
925 }
926 #endif
927 rthlen = (rth->ip6r_len + 1) << 3;
928 eoff += rthlen;
929 nxt = rth->ip6r_nxt;
930 break;
931 case IPPROTO_FRAGMENT:
932 #ifndef PULLDOWN_TEST
933 IP6_EXTHDR_CHECK(m, 0, eoff +
934 sizeof(struct ip6_frag),
935 -1);
936 fh = (struct ip6_frag *)(mtod(m, caddr_t)
937 + eoff);
938 #else
939 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
940 eoff, sizeof(*fh));
941 if (fh == NULL) {
942 icmp6stat.icp6s_tooshort++;
943 return (-1);
944 }
945 #endif
946 /*
947 * Data after a fragment header is meaningless
948 * unless it is the first fragment, but
949 * we'll go to the notify label for path MTU
950 * discovery.
951 */
952 if (fh->ip6f_offlg & IP6F_OFF_MASK)
953 goto notify;
954
955 eoff += sizeof(struct ip6_frag);
956 nxt = fh->ip6f_nxt;
957 break;
958 default:
959 /*
960 * This case includes ESP and the No Next
961 * Header. In such cases going to the notify
962 * label does not have any meaning
963 * (i.e. pr_ctlinput will be NULL), but we go
964 * anyway since we might have to update
965 * path MTU information.
966 */
967 goto notify;
968 }
969 }
970 notify:
971 #ifndef PULLDOWN_TEST
972 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
973 #else
974 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
975 sizeof(*icmp6) + sizeof(struct ip6_hdr));
976 if (icmp6 == NULL) {
977 icmp6stat.icp6s_tooshort++;
978 return (-1);
979 }
980 #endif
981
982 eip6 = (struct ip6_hdr *)(icmp6 + 1);
983 bzero(&icmp6dst, sizeof(icmp6dst));
984 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
985 icmp6dst.sin6_family = AF_INET6;
986 if (finaldst == NULL)
987 icmp6dst.sin6_addr = eip6->ip6_dst;
988 else
989 icmp6dst.sin6_addr = *finaldst;
990 if (in6_addr2zoneid(m->m_pkthdr.rcvif, &icmp6dst.sin6_addr,
991 &icmp6dst.sin6_scope_id))
992 goto freeit;
993 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst,
994 NULL, NULL)) {
995 /* should be impossbile */
996 nd6log((LOG_DEBUG,
997 "icmp6_notify_error: in6_embedscope failed\n"));
998 goto freeit;
999 }
1000
1001 /*
1002 * retrieve parameters from the inner IPv6 header, and convert
1003 * them into sockaddr structures.
1004 */
1005 bzero(&icmp6src, sizeof(icmp6src));
1006 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1007 icmp6src.sin6_family = AF_INET6;
1008 icmp6src.sin6_addr = eip6->ip6_src;
1009 if (in6_addr2zoneid(m->m_pkthdr.rcvif, &icmp6src.sin6_addr,
1010 &icmp6src.sin6_scope_id))
1011 goto freeit;
1012 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src,
1013 NULL, NULL)) {
1014 /* should be impossbile */
1015 nd6log((LOG_DEBUG,
1016 "icmp6_notify_error: in6_embedscope failed\n"));
1017 goto freeit;
1018 }
1019 icmp6src.sin6_flowinfo =
1020 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1021
1022 if (finaldst == NULL)
1023 finaldst = &eip6->ip6_dst;
1024 ip6cp.ip6c_m = m;
1025 ip6cp.ip6c_icmp6 = icmp6;
1026 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1027 ip6cp.ip6c_off = eoff;
1028 ip6cp.ip6c_finaldst = finaldst;
1029 ip6cp.ip6c_src = &icmp6src;
1030 ip6cp.ip6c_nxt = nxt;
1031
1032 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1033 notifymtu = ntohl(icmp6->icmp6_mtu);
1034 ip6cp.ip6c_cmdarg = (void *)&notifymtu;
1035 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1036 }
1037
1038 so_pr_ctlinput(
1039 &inet6sw[ip6_protox[nxt]],
1040 code, (struct sockaddr *)&icmp6dst, &ip6cp);
1041 }
1042 return (0);
1043
1044 freeit:
1045 m_freem(m);
1046 return (-1);
1047 }
1048
1049 void
1050 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1051 {
1052 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1053 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1054 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1055 u_int mtu = ntohl(icmp6->icmp6_mtu);
1056 struct rtentry *rt = NULL;
1057 struct sockaddr_in6 sin6;
1058
1059 if (!validated)
1060 return;
1061
1062 bzero(&sin6, sizeof(sin6));
1063 sin6.sin6_family = PF_INET6;
1064 sin6.sin6_len = sizeof(struct sockaddr_in6);
1065 sin6.sin6_addr = *dst;
1066 /* XXX normally, this won't happen */
1067 if (IN6_IS_ADDR_LINKLOCAL(dst)) {
1068 sin6.sin6_addr.s6_addr16[1] =
1069 htons(m->m_pkthdr.rcvif->if_index);
1070 }
1071 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
1072 rt = rtpurelookup((struct sockaddr *)&sin6);
1073 if (rt != NULL && (rt->rt_flags & RTF_HOST) &&
1074 !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
1075 if (mtu < IPV6_MMTU) { /* XXX */
1076 rt->rt_rmx.rmx_locks |= RTV_MTU;
1077 } else if (mtu < rt->rt_ifp->if_mtu &&
1078 rt->rt_rmx.rmx_mtu > mtu) {
1079 icmp6stat.icp6s_pmtuchg++;
1080 rt->rt_rmx.rmx_mtu = mtu;
1081 }
1082 }
1083 if (rt)
1084 --rt->rt_refcnt;
1085 }
1086
1087 /*
1088 * Process a Node Information Query packet, based on
1089 * draft-ietf-ipngwg-icmp-name-lookups-07.
1090 *
1091 * Spec incompatibilities:
1092 * - IPv6 Subject address handling
1093 * - IPv4 Subject address handling support missing
1094 * - Proxy reply (answer even if it's not for me)
1095 * - joins NI group address at in6_ifattach() time only, does not cope
1096 * with hostname changes by sethostname(3)
1097 */
1098 #define hostnamelen strlen(hostname)
1099 static struct mbuf *
1100 ni6_input(struct mbuf *m, int off)
1101 {
1102 struct icmp6_nodeinfo *ni6, *nni6;
1103 struct mbuf *n = NULL;
1104 u_int16_t qtype;
1105 int subjlen;
1106 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1107 struct ni_reply_fqdn *fqdn;
1108 int addrs; /* for NI_QTYPE_NODEADDR */
1109 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1110 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
1111 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
1112 struct ip6_hdr *ip6;
1113 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1114 char *subj = NULL;
1115 struct in6_ifaddr *ia6 = NULL;
1116
1117 ip6 = mtod(m, struct ip6_hdr *);
1118 #ifndef PULLDOWN_TEST
1119 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1120 #else
1121 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1122 if (ni6 == NULL) {
1123 /* m is already reclaimed */
1124 return NULL;
1125 }
1126 #endif
1127
1128 /*
1129 * Validate IPv6 destination address.
1130 *
1131 * The Responder must discard the Query without further processing
1132 * unless it is one of the Responder's unicast or anycast addresses, or
1133 * a link-local scope multicast address which the Responder has joined.
1134 * [icmp-name-lookups-07, Section 4.]
1135 */
1136 bzero(&sin6, sizeof(sin6));
1137 sin6.sin6_family = AF_INET6;
1138 sin6.sin6_len = sizeof(struct sockaddr_in6);
1139 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
1140 /* XXX scopeid */
1141 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) {
1142 /* unicast/anycast, fine */
1143 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
1144 (icmp6_nodeinfo & 4) == 0) {
1145 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1146 "a temporary address in %s:%d",
1147 __FILE__, __LINE__));
1148 goto bad;
1149 }
1150 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr))
1151 ; /* link-local multicast, fine */
1152 else
1153 goto bad;
1154
1155 /* validate query Subject field. */
1156 qtype = ntohs(ni6->ni_qtype);
1157 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1158 switch (qtype) {
1159 case NI_QTYPE_NOOP:
1160 case NI_QTYPE_SUPTYPES:
1161 /* 07 draft */
1162 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1163 break;
1164 /* FALLTHROUGH */
1165 case NI_QTYPE_FQDN:
1166 case NI_QTYPE_NODEADDR:
1167 switch (ni6->ni_code) {
1168 case ICMP6_NI_SUBJ_IPV6:
1169 #if ICMP6_NI_SUBJ_IPV6 != 0
1170 case 0:
1171 #endif
1172 /*
1173 * backward compatibility - try to accept 03 draft
1174 * format, where no Subject is present.
1175 */
1176 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1177 subjlen == 0) {
1178 oldfqdn++;
1179 break;
1180 }
1181 #if ICMP6_NI_SUBJ_IPV6 != 0
1182 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1183 goto bad;
1184 #endif
1185
1186 if (subjlen != sizeof(sin6.sin6_addr))
1187 goto bad;
1188
1189 /*
1190 * Validate Subject address.
1191 *
1192 * Not sure what exactly "address belongs to the node"
1193 * means in the spec, is it just unicast, or what?
1194 *
1195 * At this moment we consider Subject address as
1196 * "belong to the node" if the Subject address equals
1197 * to the IPv6 destination address; validation for
1198 * IPv6 destination address should have done enough
1199 * check for us.
1200 *
1201 * We do not do proxy at this moment.
1202 */
1203 /* m_pulldown instead of copy? */
1204 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1205 subjlen, (caddr_t)&sin6.sin6_addr);
1206 if (in6_addr2zoneid(m->m_pkthdr.rcvif,
1207 &sin6.sin6_addr, &sin6.sin6_scope_id))
1208 goto bad;
1209 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL);
1210 bzero(&sin6_d, sizeof(sin6_d));
1211 sin6_d.sin6_family = AF_INET6; /* not used, actually */
1212 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */
1213 sin6_d.sin6_addr = ip6->ip6_dst;
1214 if (in6_addr2zoneid(m->m_pkthdr.rcvif,
1215 &ip6->ip6_dst, &sin6_d.sin6_scope_id))
1216 goto bad;
1217 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL);
1218 subj = (char *)&sin6;
1219 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
1220 break;
1221
1222 /*
1223 * XXX if we are to allow other cases, we should really
1224 * be careful about scope here.
1225 * basically, we should disallow queries toward IPv6
1226 * destination X with subject Y, if scope(X) > scope(Y).
1227 * if we allow scope(X) > scope(Y), it will result in
1228 * information leakage across scope boundary.
1229 */
1230 goto bad;
1231
1232 case ICMP6_NI_SUBJ_FQDN:
1233 /*
1234 * Validate Subject name with gethostname(3).
1235 *
1236 * The behavior may need some debate, since:
1237 * - we are not sure if the node has FQDN as
1238 * hostname (returned by gethostname(3)).
1239 * - the code does wildcard match for truncated names.
1240 * however, we are not sure if we want to perform
1241 * wildcard match, if gethostname(3) side has
1242 * truncated hostname.
1243 */
1244 n = ni6_nametodns(hostname, hostnamelen, 0);
1245 if (!n || n->m_next || n->m_len == 0)
1246 goto bad;
1247 IP6_EXTHDR_GET(subj, char *, m,
1248 off + sizeof(struct icmp6_nodeinfo), subjlen);
1249 if (subj == NULL)
1250 goto bad;
1251 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1252 n->m_len)) {
1253 goto bad;
1254 }
1255 m_freem(n);
1256 n = NULL;
1257 break;
1258
1259 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1260 default:
1261 goto bad;
1262 }
1263 break;
1264 }
1265
1266 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1267 switch (qtype) {
1268 case NI_QTYPE_FQDN:
1269 if ((icmp6_nodeinfo & 1) == 0)
1270 goto bad;
1271 break;
1272 case NI_QTYPE_NODEADDR:
1273 if ((icmp6_nodeinfo & 2) == 0)
1274 goto bad;
1275 break;
1276 }
1277
1278 /* guess reply length */
1279 switch (qtype) {
1280 case NI_QTYPE_NOOP:
1281 break; /* no reply data */
1282 case NI_QTYPE_SUPTYPES:
1283 replylen += sizeof(u_int32_t);
1284 break;
1285 case NI_QTYPE_FQDN:
1286 /* XXX will append an mbuf */
1287 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1288 break;
1289 case NI_QTYPE_NODEADDR:
1290 addrs = ni6_addrs(ni6, m, &ifp, subj);
1291 if ((replylen += addrs * (sizeof(struct in6_addr) +
1292 sizeof(u_int32_t))) > MCLBYTES)
1293 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1294 break;
1295 default:
1296 /*
1297 * XXX: We must return a reply with the ICMP6 code
1298 * `unknown Qtype' in this case. However we regard the case
1299 * as an FQDN query for backward compatibility.
1300 * Older versions set a random value to this field,
1301 * so it rarely varies in the defined qtypes.
1302 * But the mechanism is not reliable...
1303 * maybe we should obsolete older versions.
1304 */
1305 qtype = NI_QTYPE_FQDN;
1306 /* XXX will append an mbuf */
1307 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1308 oldfqdn++;
1309 break;
1310 }
1311
1312 /* allocate an mbuf to reply. */
1313 if (replylen > MCLBYTES) {
1314 /*
1315 * XXX: should we try to allocate more? But MCLBYTES
1316 * is probably much larger than IPV6_MMTU...
1317 */
1318 goto bad;
1319 }
1320 n = m_getb(replylen, M_NOWAIT, m->m_type, M_PKTHDR);
1321 if (n == NULL) {
1322 m_freem(m);
1323 return (NULL);
1324 }
1325 M_MOVE_PKTHDR(n, m); /* just for recvif */
1326 n->m_pkthdr.len = n->m_len = replylen;
1327
1328 /* copy mbuf header and IPv6 + Node Information base headers */
1329 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1330 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1331 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1332
1333 /* qtype dependent procedure */
1334 switch (qtype) {
1335 case NI_QTYPE_NOOP:
1336 nni6->ni_code = ICMP6_NI_SUCCESS;
1337 nni6->ni_flags = 0;
1338 break;
1339 case NI_QTYPE_SUPTYPES:
1340 {
1341 u_int32_t v;
1342 nni6->ni_code = ICMP6_NI_SUCCESS;
1343 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1344 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1345 v = (u_int32_t)htonl(0x0000000f);
1346 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1347 break;
1348 }
1349 case NI_QTYPE_FQDN:
1350 nni6->ni_code = ICMP6_NI_SUCCESS;
1351 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1352 sizeof(struct ip6_hdr) +
1353 sizeof(struct icmp6_nodeinfo));
1354 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1355 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1356 /*
1357 * XXX do we really have FQDN in variable "hostname"?
1358 */
1359 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1360 if (n->m_next == NULL)
1361 goto bad;
1362 /* XXX we assume that n->m_next is not a chain */
1363 if (n->m_next->m_next != NULL)
1364 goto bad;
1365 n->m_pkthdr.len += n->m_next->m_len;
1366 break;
1367 case NI_QTYPE_NODEADDR:
1368 {
1369 int lenlim, copied;
1370
1371 nni6->ni_code = ICMP6_NI_SUCCESS;
1372 n->m_pkthdr.len = n->m_len =
1373 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1374 lenlim = M_TRAILINGSPACE(n);
1375 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1376 /* XXX: reset mbuf length */
1377 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1378 sizeof(struct icmp6_nodeinfo) + copied;
1379 break;
1380 }
1381 default:
1382 break; /* XXX impossible! */
1383 }
1384
1385 nni6->ni_type = ICMP6_NI_REPLY;
1386 m_freem(m);
1387 return (n);
1388
1389 bad:
1390 m_freem(m);
1391 if (n)
1392 m_freem(n);
1393 return (NULL);
1394 }
1395 #undef hostnamelen
1396
1397 /*
1398 * make a mbuf with DNS-encoded string. no compression support.
1399 *
1400 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1401 * treated as truncated name (two \0 at the end). this is a wild guess.
1402 */
1403 static struct mbuf *
1404 ni6_nametodns(const char *name, int namelen,
1405 int old) /* return pascal string if non-zero */
1406 {
1407 struct mbuf *m;
1408 char *cp, *ep;
1409 const char *p, *q;
1410 int i, len, nterm;
1411
1412 if (old)
1413 len = namelen + 1;
1414 else
1415 len = MCLBYTES;
1416
1417 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1418 m = m_getb(len, M_NOWAIT, MT_DATA, 0);
1419 if (!m)
1420 goto fail;
1421
1422 if (old) {
1423 m->m_len = len;
1424 *mtod(m, char *) = namelen;
1425 bcopy(name, mtod(m, char *) + 1, namelen);
1426 return m;
1427 } else {
1428 m->m_len = 0;
1429 cp = mtod(m, char *);
1430 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1431
1432 /* if not certain about my name, return empty buffer */
1433 if (namelen == 0)
1434 return m;
1435
1436 /*
1437 * guess if it looks like shortened hostname, or FQDN.
1438 * shortened hostname needs two trailing "\0".
1439 */
1440 i = 0;
1441 for (p = name; p < name + namelen; p++) {
1442 if (*p && *p == '.')
1443 i++;
1444 }
1445 if (i < 2)
1446 nterm = 2;
1447 else
1448 nterm = 1;
1449
1450 p = name;
1451 while (cp < ep && p < name + namelen) {
1452 i = 0;
1453 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1454 i++;
1455 /* result does not fit into mbuf */
1456 if (cp + i + 1 >= ep)
1457 goto fail;
1458 /*
1459 * DNS label length restriction, RFC1035 page 8.
1460 * "i == 0" case is included here to avoid returning
1461 * 0-length label on "foo..bar".
1462 */
1463 if (i <= 0 || i >= 64)
1464 goto fail;
1465 *cp++ = i;
1466 bcopy(p, cp, i);
1467 cp += i;
1468 p = q;
1469 if (p < name + namelen && *p == '.')
1470 p++;
1471 }
1472 /* termination */
1473 if (cp + nterm >= ep)
1474 goto fail;
1475 while (nterm-- > 0)
1476 *cp++ = '\0';
1477 m->m_len = cp - mtod(m, char *);
1478 return m;
1479 }
1480
1481 panic("should not reach here");
1482 /* NOTREACHED */
1483
1484 fail:
1485 if (m)
1486 m_freem(m);
1487 return NULL;
1488 }
1489
1490 /*
1491 * check if two DNS-encoded string matches. takes care of truncated
1492 * form (with \0\0 at the end). no compression support.
1493 * XXX upper/lowercase match (see RFC2065)
1494 */
1495 static int
1496 ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1497 {
1498 const char *a0, *b0;
1499 int l;
1500
1501 /* simplest case - need validation? */
1502 if (alen == blen && bcmp(a, b, alen) == 0)
1503 return 1;
1504
1505 a0 = a;
1506 b0 = b;
1507
1508 /* termination is mandatory */
1509 if (alen < 2 || blen < 2)
1510 return 0;
1511 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1512 return 0;
1513 alen--;
1514 blen--;
1515
1516 while (a - a0 < alen && b - b0 < blen) {
1517 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1518 return 0;
1519
1520 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1521 return 0;
1522 /* we don't support compression yet */
1523 if (a[0] >= 64 || b[0] >= 64)
1524 return 0;
1525
1526 /* truncated case */
1527 if (a[0] == 0 && a - a0 == alen - 1)
1528 return 1;
1529 if (b[0] == 0 && b - b0 == blen - 1)
1530 return 1;
1531 if (a[0] == 0 || b[0] == 0)
1532 return 0;
1533
1534 if (a[0] != b[0])
1535 return 0;
1536 l = a[0];
1537 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1538 return 0;
1539 if (bcmp(a + 1, b + 1, l) != 0)
1540 return 0;
1541
1542 a += 1 + l;
1543 b += 1 + l;
1544 }
1545
1546 if (a - a0 == alen && b - b0 == blen)
1547 return 1;
1548 else
1549 return 0;
1550 }
1551
1552 /*
1553 * calculate the number of addresses to be returned in the node info reply.
1554 */
1555 static int
1556 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
1557 char *subj)
1558 {
1559 const struct ifnet_array *arr;
1560 struct in6_ifaddr *ifa6;
1561 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
1562 int addrs = 0, addrsofif, iffound = 0;
1563 int niflags = ni6->ni_flags;
1564 int i;
1565
1566 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1567 switch (ni6->ni_code) {
1568 case ICMP6_NI_SUBJ_IPV6:
1569 if (subj == NULL) /* must be impossible... */
1570 return (0);
1571 subj_ip6 = (struct sockaddr_in6 *)subj;
1572 break;
1573 default:
1574 /*
1575 * XXX: we only support IPv6 subject address for
1576 * this Qtype.
1577 */
1578 return (0);
1579 }
1580 }
1581
1582 arr = ifnet_array_get();
1583 for (i = 0; i < arr->ifnet_count; ++i) {
1584 struct ifnet *ifp = arr->ifnet_arr[i];
1585 struct ifaddr_container *ifac;
1586
1587 addrsofif = 0;
1588 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link)
1589 {
1590 struct ifaddr *ifa = ifac->ifa;
1591
1592 if (ifa->ifa_addr->sa_family != AF_INET6)
1593 continue;
1594 ifa6 = (struct in6_ifaddr *)ifa;
1595
1596 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1597 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
1598 &ifa6->ia_addr.sin6_addr))
1599 iffound = 1;
1600
1601 /*
1602 * IPv4-mapped addresses can only be returned by a
1603 * Node Information proxy, since they represent
1604 * addresses of IPv4-only nodes, which perforce do
1605 * not implement this protocol.
1606 * [icmp-name-lookups-07, Section 5.4]
1607 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1608 * this function at this moment.
1609 */
1610
1611 /* What do we have to do about ::1? */
1612 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1613 case IPV6_ADDR_SCOPE_LINKLOCAL:
1614 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1615 continue;
1616 break;
1617 case IPV6_ADDR_SCOPE_SITELOCAL:
1618 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1619 continue;
1620 break;
1621 case IPV6_ADDR_SCOPE_GLOBAL:
1622 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1623 continue;
1624 break;
1625 default:
1626 continue;
1627 }
1628
1629 /*
1630 * check if anycast is okay.
1631 * XXX: just experimental. not in the spec.
1632 */
1633 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) &&
1634 !(niflags & NI_NODEADDR_FLAG_ANYCAST))
1635 continue; /* we need only unicast addresses */
1636 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) &&
1637 (icmp6_nodeinfo & 4) == 0) {
1638 continue;
1639 }
1640 addrsofif++; /* count the address */
1641 }
1642 if (iffound) {
1643 *ifpp = ifp;
1644 return (addrsofif);
1645 }
1646
1647 addrs += addrsofif;
1648 }
1649
1650 return (addrs);
1651 }
1652
1653 static int
1654 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
1655 struct ifnet *ifp0, int resid)
1656 {
1657 const struct ifnet_array *arr;
1658 struct in6_ifaddr *ifa6;
1659 int copied = 0, allow_deprecated = 0;
1660 u_char *cp = (u_char *)(nni6 + 1);
1661 int niflags = ni6->ni_flags;
1662 u_int32_t ltime;
1663 int idx, idx_dep = -1;
1664
1665 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1666 return (0); /* needless to copy */
1667
1668 arr = ifnet_array_get();
1669 if (ifp0 == NULL) {
1670 idx = 0;
1671 } else {
1672 for (idx = 0; idx < arr->ifnet_count; ++idx) {
1673 if (arr->ifnet_arr[idx] == ifp0)
1674 break;
1675 }
1676 }
1677
1678 again:
1679
1680 for (; idx < arr->ifnet_count; ++idx) {
1681 struct ifnet *ifp = arr->ifnet_arr[idx];
1682 struct ifaddr_container *ifac;
1683
1684 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1685 struct ifaddr *ifa = ifac->ifa;
1686
1687 if (ifa->ifa_addr->sa_family != AF_INET6)
1688 continue;
1689 ifa6 = (struct in6_ifaddr *)ifa;
1690
1691 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) &&
1692 allow_deprecated == 0) {
1693 /*
1694 * prefererred address should be put before
1695 * deprecated addresses.
1696 */
1697
1698 /* record the interface for later search */
1699 if (idx_dep < 0)
1700 idx_dep = idx;
1701
1702 continue;
1703 }
1704 else if (!(ifa6->ia6_flags & IN6_IFF_DEPRECATED) &&
1705 allow_deprecated != 0)
1706 continue; /* we now collect deprecated addrs */
1707
1708 /* What do we have to do about ::1? */
1709 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1710 case IPV6_ADDR_SCOPE_LINKLOCAL:
1711 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1712 continue;
1713 break;
1714 case IPV6_ADDR_SCOPE_SITELOCAL:
1715 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1716 continue;
1717 break;
1718 case IPV6_ADDR_SCOPE_GLOBAL:
1719 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1720 continue;
1721 break;
1722 default:
1723 continue;
1724 }
1725
1726 /*
1727 * check if anycast is okay.
1728 * XXX: just experimental. not in the spec.
1729 */
1730 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) &&
1731 !(niflags & NI_NODEADDR_FLAG_ANYCAST))
1732 continue;
1733 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) &&
1734 (icmp6_nodeinfo & 4) == 0) {
1735 continue;
1736 }
1737
1738 /* now we can copy the address */
1739 if (resid < sizeof(struct in6_addr) +
1740 sizeof(u_int32_t)) {
1741 /*
1742 * We give up much more copy.
1743 * Set the truncate flag and return.
1744 */
1745 nni6->ni_flags |=
1746 NI_NODEADDR_FLAG_TRUNCATE;
1747 return (copied);
1748 }
1749
1750 /*
1751 * Set the TTL of the address.
1752 * The TTL value should be one of the following
1753 * according to the specification:
1754 *
1755 * 1. The remaining lifetime of a DHCP lease on the
1756 * address, or
1757 * 2. The remaining Valid Lifetime of a prefix from
1758 * which the address was derived through Stateless
1759 * Autoconfiguration.
1760 *
1761 * Note that we currently do not support stateful
1762 * address configuration by DHCPv6, so the former
1763 * case can't happen.
1764 */
1765 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1766 ltime = ND6_INFINITE_LIFETIME;
1767 else {
1768 if (ifa6->ia6_lifetime.ia6t_expire >
1769 time_uptime)
1770 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime);
1771 else
1772 ltime = 0;
1773 }
1774
1775 bcopy(&ltime, cp, sizeof(u_int32_t));
1776 cp += sizeof(u_int32_t);
1777
1778 /* copy the address itself */
1779 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1780 sizeof(struct in6_addr));
1781 in6_clearscope((struct in6_addr *)cp); /* XXX */
1782 cp += sizeof(struct in6_addr);
1783
1784 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1785 copied += (sizeof(struct in6_addr) +
1786 sizeof(u_int32_t));
1787 }
1788 if (ifp0) /* we need search only on the specified IF */
1789 break;
1790 }
1791
1792 if (allow_deprecated == 0 && idx_dep >= 0) {
1793 idx = idx_dep;
1794 allow_deprecated = 1;
1795
1796 goto again;
1797 }
1798
1799 return (copied);
1800 }
1801
1802 /*
1803 * XXX almost dup'ed code with rip6_input.
1804 */
1805 static int
1806 icmp6_rip6_input(struct mbuf **mp, int off)
1807 {
1808 struct mbuf *m = *mp;
1809 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1810 struct in6pcb *in6p;
1811 struct in6pcb *last = NULL;
1812 struct sockaddr_in6 fromsa;
1813 struct icmp6_hdr *icmp6;
1814 struct mbuf *opts = NULL;
1815
1816 #ifndef PULLDOWN_TEST
1817 /* this is assumed to be safe. */
1818 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1819 #else
1820 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1821 if (icmp6 == NULL) {
1822 /* m is already reclaimed */
1823 return IPPROTO_DONE;
1824 }
1825 #endif
1826
1827 bzero(&fromsa, sizeof(fromsa));
1828 fromsa.sin6_len = sizeof(struct sockaddr_in6);
1829 fromsa.sin6_family = AF_INET6;
1830 /* KAME hack: recover scopeid */
1831 in6_recoverscope(&fromsa, &ip6->ip6_src, m->m_pkthdr.rcvif);
1832
1833 LIST_FOREACH(in6p, &ripcbinfo.pcblisthead, inp_list)
1834 {
1835 if (in6p->inp_flags & INP_PLACEMARKER)
1836 continue;
1837 if (!INP_ISIPV6(in6p))
1838 continue;
1839 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
1840 continue;
1841 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1842 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1843 continue;
1844 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1845 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1846 continue;
1847 if (in6p->in6p_icmp6filt
1848 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1849 in6p->in6p_icmp6filt))
1850 continue;
1851 if (last) {
1852 struct socket *so;
1853 struct mbuf *n;
1854
1855 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1856 if (last->in6p_flags & IN6P_CONTROLOPTS)
1857 ip6_savecontrol(last, &opts, ip6, n);
1858 /* strip intermediate headers */
1859 m_adj(n, off);
1860 so = last->in6p_socket;
1861 lwkt_gettoken(&so->so_rcv.ssb_token);
1862 if (ssb_appendaddr(&so->so_rcv,
1863 (struct sockaddr *)&fromsa, n, opts) == 0) {
1864 /* should notify about lost packet */
1865 m_freem(n);
1866 if (opts)
1867 m_freem(opts);
1868 } else {
1869 sorwakeup(so);
1870 }
1871 lwkt_reltoken(&so->so_rcv.ssb_token);
1872 opts = NULL;
1873 }
1874 }
1875 last = in6p;
1876 }
1877 if (last) {
1878 struct socket *so;
1879
1880 if (last->in6p_flags & IN6P_CONTROLOPTS)
1881 ip6_savecontrol(last, &opts, ip6, m);
1882 /* strip intermediate headers */
1883 m_adj(m, off);
1884 so = last->in6p_socket;
1885 lwkt_gettoken(&so->so_rcv.ssb_token);
1886 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&fromsa,
1887 m, opts) == 0) {
1888 m_freem(m);
1889 if (opts)
1890 m_freem(opts);
1891 } else {
1892 sorwakeup(so);
1893 }
1894 lwkt_reltoken(&so->so_rcv.ssb_token);
1895 } else {
1896 m_freem(m);
1897 ip6stat.ip6s_delivered--;
1898 }
1899 return IPPROTO_DONE;
1900 }
1901
1902 /*
1903 * Reflect the ip6 packet back to the source.
1904 * OFF points to the icmp6 header, counted from the top of the mbuf.
1905 */
1906 void
1907 icmp6_reflect(struct mbuf *m, size_t off)
1908 {
1909 struct ip6_hdr *ip6;
1910 struct icmp6_hdr *icmp6;
1911 struct in6_ifaddr *ia;
1912 struct in6_addr t, *src = NULL;
1913 int plen;
1914 int type, code;
1915 struct ifnet *outif = NULL;
1916 struct sockaddr_in6 sa6_src, sa6_dst;
1917 #ifdef COMPAT_RFC1885
1918 int mtu = IPV6_MMTU;
1919 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst;
1920 #endif
1921
1922 /* too short to reflect */
1923 if (off < sizeof(struct ip6_hdr)) {
1924 nd6log((LOG_DEBUG,
1925 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
1926 (u_long)off, (u_long)sizeof(struct ip6_hdr),
1927 __FILE__, __LINE__));
1928 goto bad;
1929 }
1930
1931 /*
1932 * If there are extra headers between IPv6 and ICMPv6, strip
1933 * off that header first.
1934 */
1935 #ifdef DIAGNOSTIC
1936 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
1937 panic("assumption failed in icmp6_reflect");
1938 #endif
1939 if (off > sizeof(struct ip6_hdr)) {
1940 size_t l;
1941 struct ip6_hdr nip6;
1942
1943 l = off - sizeof(struct ip6_hdr);
1944 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
1945 m_adj(m, l);
1946 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
1947 if (m->m_len < l) {
1948 if ((m = m_pullup(m, l)) == NULL)
1949 return;
1950 }
1951 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
1952 } else /* off == sizeof(struct ip6_hdr) */ {
1953 size_t l;
1954 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
1955 if (m->m_len < l) {
1956 if ((m = m_pullup(m, l)) == NULL)
1957 return;
1958 }
1959 }
1960 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
1961 ip6 = mtod(m, struct ip6_hdr *);
1962 ip6->ip6_nxt = IPPROTO_ICMPV6;
1963 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
1964 type = icmp6->icmp6_type; /* keep type for statistics */
1965 code = icmp6->icmp6_code; /* ditto. */
1966
1967 t = ip6->ip6_dst;
1968 /*
1969 * ip6_input() drops a packet if its src is multicast.
1970 * So, the src is never multicast.
1971 */
1972 ip6->ip6_dst = ip6->ip6_src;
1973
1974 /*
1975 * XXX: make sure to embed scope zone information, using
1976 * already embedded IDs or the received interface (if any).
1977 * Note that rcvif may be NULL.
1978 * TODO: scoped routing case (XXX).
1979 */
1980 bzero(&sa6_src, sizeof(sa6_src));
1981 sa6_src.sin6_family = AF_INET6;
1982 sa6_src.sin6_len = sizeof(sa6_src);
1983 sa6_src.sin6_addr = ip6->ip6_dst;
1984 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
1985 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL);
1986 bzero(&sa6_dst, sizeof(sa6_dst));
1987 sa6_dst.sin6_family = AF_INET6;
1988 sa6_dst.sin6_len = sizeof(sa6_dst);
1989 sa6_dst.sin6_addr = t;
1990 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
1991 in6_embedscope(&t, &sa6_dst, NULL, NULL);
1992
1993 #ifdef COMPAT_RFC1885
1994 /*
1995 * xxx guess MTU
1996 * RFC 1885 requires that echo reply should be truncated if it
1997 * does not fit in with (return) path MTU, but the description was
1998 * removed in the new spec.
1999 */
2000 if (icmp6_reflect_rt.ro_rt == 0 ||
2001 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) {
2002 if (icmp6_reflect_rt.ro_rt) {
2003 RTFREE(icmp6_reflect_rt.ro_rt);
2004 icmp6_reflect_rt.ro_rt = 0;
2005 }
2006 bzero(sin6, sizeof(*sin6));
2007 sin6->sin6_family = PF_INET6;
2008 sin6->sin6_len = sizeof(struct sockaddr_in6);
2009 sin6->sin6_addr = ip6->ip6_dst;
2010
2011 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt,
2012 RTF_PRCLONING);
2013 }
2014
2015 if (icmp6_reflect_rt.ro_rt == 0)
2016 goto bad;
2017
2018 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST)
2019 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu)
2020 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu;
2021
2022 if (mtu < m->m_pkthdr.len) {
2023 plen -= (m->m_pkthdr.len - mtu);
2024 m_adj(m, mtu - m->m_pkthdr.len);
2025 }
2026 #endif
2027 /*
2028 * If the incoming packet was addressed directly to us(i.e. unicast),
2029 * use dst as the src for the reply.
2030 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible
2031 * (for example) when we encounter an error while forwarding procedure
2032 * destined to a duplicated address of ours.
2033 */
2034 for (ia = in6_ifaddr; ia; ia = ia->ia_next)
2035 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
2036 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2037 src = &t;
2038 break;
2039 }
2040 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
2041 /*
2042 * This is the case if the dst is our link-local address
2043 * and the sender is also ourselves.
2044 */
2045 src = &t;
2046 }
2047
2048 if (src == NULL) {
2049 int e;
2050 struct route_in6 ro;
2051
2052 /*
2053 * This case matches to multicasts, our anycast, or unicasts
2054 * that we do not own. Select a source address based on the
2055 * source address of the erroneous packet.
2056 */
2057 bzero(&ro, sizeof(ro));
2058 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e, NULL);
2059 if (ro.ro_rt)
2060 RTFREE(ro.ro_rt); /* XXX: we could use this */
2061 if (src == NULL) {
2062 nd6log((LOG_DEBUG,
2063 "icmp6_reflect: source can't be determined: "
2064 "dst=%s, error=%d\n",
2065 ip6_sprintf(&sa6_src.sin6_addr), e));
2066 goto bad;
2067 }
2068 }
2069
2070 ip6->ip6_src = *src;
2071
2072 ip6->ip6_flow = 0;
2073 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2074 ip6->ip6_vfc |= IPV6_VERSION;
2075 ip6->ip6_nxt = IPPROTO_ICMPV6;
2076 if (m->m_pkthdr.rcvif) {
2077 /* XXX: This may not be the outgoing interface */
2078 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2079 if (ip6->ip6_hlim < ip6_minhlim)
2080 ip6->ip6_hlim = ip6_minhlim;
2081 } else {
2082 ip6->ip6_hlim = ip6_defhlim;
2083 }
2084
2085 icmp6->icmp6_cksum = 0;
2086 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2087 sizeof(struct ip6_hdr), plen);
2088
2089 /*
2090 * XXX option handling
2091 */
2092
2093 m->m_flags &= ~(M_BCAST|M_MCAST);
2094
2095 #ifdef COMPAT_RFC1885
2096 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL);
2097 #else
2098 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2099 #endif
2100 if (outif)
2101 icmp6_ifoutstat_inc(outif, type, code);
2102
2103 return;
2104
2105 bad:
2106 m_freem(m);
2107 return;
2108 }
2109
2110 static void
2111 icmp6_fasttimo_dispatch(netmsg_t nmsg)
2112 {
2113
2114 ASSERT_NETISR0;
2115
2116 /* Reply ASAP. */
2117 crit_enter();
2118 netisr_replymsg(&nmsg->base, 0);
2119 crit_exit();
2120
2121 mld6_fasttimeo();
2122
2123 callout_reset(&icmp6_fasttimo_ch, ICMP6_FASTTIMO, icmp6_fasttimo, NULL);
2124 }
2125
2126 static void
2127 icmp6_fasttimo(void *dummy __unused)
2128 {
2129 struct netmsg_base *nmsg = &icmp6_fasttimo_nmsg;
2130
2131 KKASSERT(mycpuid == 0);
2132
2133 crit_enter();
2134 if (nmsg->lmsg.ms_flags & MSGF_DONE)
2135 netisr_sendmsg_oncpu(nmsg);
2136 crit_exit();
2137 }
2138
2139 static const char *
2140 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
2141 struct in6_addr *tgt6)
2142 {
2143 static char buf[1024];
2144 ksnprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2145 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
2146 return buf;
2147 }
2148
2149 void
2150 icmp6_redirect_input(struct mbuf *m, int off)
2151 {
2152 struct ifnet *ifp = m->m_pkthdr.rcvif;
2153 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2154 struct nd_redirect *nd_rd;
2155 int icmp6len = ntohs(ip6->ip6_plen);
2156 char *lladdr = NULL;
2157 int lladdrlen = 0;
2158 #if 0
2159 u_char *redirhdr = NULL;
2160 int redirhdrlen = 0;
2161 #endif
2162 struct rtentry *rt = NULL;
2163 int is_router;
2164 int is_onlink;
2165 struct in6_addr src6 = ip6->ip6_src;
2166 struct in6_addr redtgt6;
2167 struct in6_addr reddst6;
2168 union nd_opts ndopts;
2169
2170 if (!m || !ifp)
2171 return;
2172
2173 /* XXX if we are router, we don't update route by icmp6 redirect */
2174 if (ip6_forwarding)
2175 goto freeit;
2176 if (!icmp6_rediraccept)
2177 goto freeit;
2178
2179 #ifndef PULLDOWN_TEST
2180 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2181 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2182 #else
2183 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2184 if (nd_rd == NULL) {
2185 icmp6stat.icp6s_tooshort++;
2186 return;
2187 }
2188 #endif
2189 redtgt6 = nd_rd->nd_rd_target;
2190 reddst6 = nd_rd->nd_rd_dst;
2191
2192 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2193 redtgt6.s6_addr16[1] = htons(ifp->if_index);
2194 if (IN6_IS_ADDR_LINKLOCAL(&reddst6))
2195 reddst6.s6_addr16[1] = htons(ifp->if_index);
2196
2197 /* validation */
2198 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2199 nd6log((LOG_ERR,
2200 "ICMP6 redirect sent from %s rejected; "
2201 "must be from linklocal\n", ip6_sprintf(&src6)));
2202 goto bad;
2203 }
2204 if (ip6->ip6_hlim != 255) {
2205 nd6log((LOG_ERR,
2206 "ICMP6 redirect sent from %s rejected; "
2207 "hlim=%d (must be 255)\n",
2208 ip6_sprintf(&src6), ip6->ip6_hlim));
2209 goto bad;
2210 }
2211 {
2212 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2213 struct sockaddr_in6 sin6;
2214 struct in6_addr *gw6;
2215
2216 bzero(&sin6, sizeof(sin6));
2217 sin6.sin6_family = AF_INET6;
2218 sin6.sin6_len = sizeof(struct sockaddr_in6);
2219 bcopy(&reddst6, &sin6.sin6_addr, sizeof reddst6);
2220 rt = rtpurelookup((struct sockaddr *)&sin6);
2221 if (rt != NULL) {
2222 if (rt->rt_gateway == NULL ||
2223 rt->rt_gateway->sa_family != AF_INET6) {
2224 nd6log((LOG_ERR,
2225 "ICMP6 redirect rejected; no route "
2226 "with inet6 gateway found for redirect dst: %s\n",
2227 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2228 --rt->rt_refcnt;
2229 goto bad;
2230 }
2231
2232 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2233 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2234 nd6log((LOG_ERR,
2235 "ICMP6 redirect rejected; "
2236 "not equal to gw-for-src=%s (must be same): "
2237 "%s\n",
2238 ip6_sprintf(gw6),
2239 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2240 --rt->rt_refcnt;
2241 goto bad;
2242 }
2243 } else {
2244 nd6log((LOG_ERR,
2245 "ICMP6 redirect rejected; "
2246 "no route found for redirect dst: %s\n",
2247 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2248 goto bad;
2249 }
2250 --rt->rt_refcnt;
2251 rt = NULL;
2252 }
2253 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2254 nd6log((LOG_ERR,
2255 "ICMP6 redirect rejected; "
2256 "redirect dst must be unicast: %s\n",
2257 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2258 goto bad;
2259 }
2260
2261 is_router = is_onlink = 0;
2262 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2263 is_router = 1; /* router case */
2264 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2265 is_onlink = 1; /* on-link destination case */
2266 if (!is_router && !is_onlink) {
2267 nd6log((LOG_ERR,
2268 "ICMP6 redirect rejected; "
2269 "neither router case nor onlink case: %s\n",
2270 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2271 goto bad;
2272 }
2273 /* validation passed */
2274
2275 icmp6len -= sizeof(*nd_rd);
2276 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2277 if (nd6_options(&ndopts) < 0) {
2278 nd6log((LOG_INFO, "icmp6_redirect_input: "
2279 "invalid ND option, rejected: %s\n",
2280 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2281 /* nd6_options have incremented stats */
2282 goto freeit;
2283 }
2284
2285 if (ndopts.nd_opts_tgt_lladdr) {
2286 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2287 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2288 }
2289
2290 #if 0
2291 if (ndopts.nd_opts_rh) {
2292 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2293 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2294 }
2295 #endif
2296
2297 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2298 nd6log((LOG_INFO,
2299 "icmp6_redirect_input: lladdrlen mismatch for %s "
2300 "(if %d, icmp6 packet %d): %s\n",
2301 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
2302 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2303 goto bad;
2304 }
2305
2306 /* RFC 2461 8.3 */
2307 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2308 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2309
2310 if (!is_onlink) { /* better router case. perform rtredirect. */
2311 /* perform rtredirect */
2312 struct sockaddr_in6 sdst;
2313 struct sockaddr_in6 sgw;
2314 struct sockaddr_in6 ssrc;
2315
2316 bzero(&sdst, sizeof(sdst));
2317 bzero(&sgw, sizeof(sgw));
2318 bzero(&ssrc, sizeof(ssrc));
2319 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2320 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2321 sizeof(struct sockaddr_in6);
2322 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2323 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2324 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2325 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
2326 NULL, RTF_GATEWAY | RTF_HOST,
2327 (struct sockaddr *)&ssrc);
2328 }
2329 /* finally update cached route in each socket via kpfctlinput */
2330 {
2331 struct sockaddr_in6 sdst;
2332
2333 bzero(&sdst, sizeof(sdst));
2334 sdst.sin6_family = AF_INET6;
2335 sdst.sin6_len = sizeof(struct sockaddr_in6);
2336 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2337 kpfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2338 }
2339
2340 freeit:
2341 m_freem(m);
2342 return;
2343
2344 bad:
2345 icmp6stat.icp6s_badredirect++;
2346 m_freem(m);
2347 }
2348
2349 void
2350 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
2351 {
2352 struct ifnet *ifp; /* my outgoing interface */
2353 struct in6_addr *ifp_ll6;
2354 struct in6_addr *router_ll6;
2355 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2356 struct mbuf *m = NULL; /* newly allocated one */
2357 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2358 struct nd_redirect *nd_rd;
2359 size_t maxlen;
2360 u_char *p;
2361 struct ifnet *outif = NULL;
2362 struct sockaddr_in6 src_sa;
2363
2364 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2365
2366 /* if we are not router, we don't send icmp6 redirect */
2367 if (!ip6_forwarding || ip6_accept_rtadv)
2368 goto fail;
2369
2370 /* sanity check */
2371 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2372 goto fail;
2373
2374 /*
2375 * Address check:
2376 * the source address must identify a neighbor, and
2377 * the destination address must not be a multicast address
2378 * [RFC 2461, sec 8.2]
2379 */
2380 sip6 = mtod(m0, struct ip6_hdr *);
2381 bzero(&src_sa, sizeof(src_sa));
2382 src_sa.sin6_family = AF_INET6;
2383 src_sa.sin6_len = sizeof(src_sa);
2384 src_sa.sin6_addr = sip6->ip6_src;
2385 /* we don't currently use sin6_scope_id, but eventually use it */
2386 if (in6_addr2zoneid(ifp, &sip6->ip6_src, &src_sa.sin6_scope_id))
2387 goto fail;
2388 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2389 goto fail;
2390 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2391 goto fail; /* what should we do here? */
2392
2393 /* rate limit */
2394 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2395 goto fail;
2396
2397 /*
2398 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2399 * we almost always ask for an mbuf cluster for simplicity.
2400 * (MHLEN < IPV6_MMTU is almost always true)
2401 */
2402 #if IPV6_MMTU >= MCLBYTES
2403 # error assumption failed about IPV6_MMTU and MCLBYTES
2404 #endif
2405 m = m_getb(IPV6_MMTU, M_NOWAIT, MT_HEADER, M_PKTHDR);
2406 if (!m)
2407 goto fail;
2408 m->m_len = 0;
2409 maxlen = M_TRAILINGSPACE(m);
2410 maxlen = min(IPV6_MMTU, maxlen);
2411 /* just for safety */
2412 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2413 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2414 goto fail;
2415 }
2416
2417 {
2418 /* get ip6 linklocal address for ifp(my outgoing interface). */
2419 struct in6_ifaddr *ia;
2420 if ((ia = in6ifa_ifpforlinklocal(ifp,
2421 IN6_IFF_NOTREADY|
2422 IN6_IFF_ANYCAST)) == NULL)
2423 goto fail;
2424 ifp_ll6 = &ia->ia_addr.sin6_addr;
2425 }
2426
2427 /* get ip6 linklocal address for the router. */
2428 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2429 struct sockaddr_in6 *sin6;
2430 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2431 router_ll6 = &sin6->sin6_addr;
2432 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2433 router_ll6 = NULL;
2434 } else
2435 router_ll6 = NULL;
2436
2437 /* ip6 */
2438 ip6 = mtod(m, struct ip6_hdr *);
2439 ip6->ip6_flow = 0;
2440 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2441 ip6->ip6_vfc |= IPV6_VERSION;
2442 /* ip6->ip6_plen will be set later */
2443 ip6->ip6_nxt = IPPROTO_ICMPV6;
2444 ip6->ip6_hlim = 255;
2445 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2446 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2447 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2448
2449 /* ND Redirect */
2450 nd_rd = (struct nd_redirect *)(ip6 + 1);
2451 nd_rd->nd_rd_type = ND_REDIRECT;
2452 nd_rd->nd_rd_code = 0;
2453 nd_rd->nd_rd_reserved = 0;
2454 if (rt->rt_flags & RTF_GATEWAY) {
2455 /*
2456 * nd_rd->nd_rd_target must be a link-local address in
2457 * better router cases.
2458 */
2459 if (!router_ll6)
2460 goto fail;
2461 bcopy(router_ll6, &nd_rd->nd_rd_target,
2462 sizeof(nd_rd->nd_rd_target));
2463 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2464 sizeof(nd_rd->nd_rd_dst));
2465 } else {
2466 /* make sure redtgt == reddst */
2467 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2468 sizeof(nd_rd->nd_rd_target));
2469 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2470 sizeof(nd_rd->nd_rd_dst));
2471 }
2472
2473 p = (u_char *)(nd_rd + 1);
2474
2475 if (!router_ll6)
2476 goto nolladdropt;
2477
2478 {
2479 /* target lladdr option */
2480 struct rtentry *rt_router = NULL;
2481 int len;
2482 struct sockaddr_dl *sdl;
2483 struct nd_opt_hdr *nd_opt;
2484 char *lladdr;
2485
2486 rt_router = nd6_lookup(router_ll6, 0, ifp);
2487 if (!rt_router)
2488 goto nolladdropt;
2489 len = sizeof(*nd_opt) + ifp->if_addrlen;
2490 len = (len + 7) & ~7; /* round by 8 */
2491 /* safety check */
2492 if (len + (p - (u_char *)ip6) > maxlen)
2493 goto nolladdropt;
2494 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2495 (rt_router->rt_flags & RTF_LLINFO) &&
2496 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2497 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
2498 sdl->sdl_alen) {
2499 nd_opt = (struct nd_opt_hdr *)p;
2500 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2501 nd_opt->nd_opt_len = len >> 3;
2502 lladdr = (char *)(nd_opt + 1);
2503 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2504 p += len;
2505 }
2506 }
2507 nolladdropt:;
2508
2509 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2510
2511 /* just to be safe */
2512 #ifdef M_DECRYPTED /*not openbsd*/
2513 if (m0->m_flags & M_DECRYPTED)
2514 goto noredhdropt;
2515 #endif
2516 if (p - (u_char *)ip6 > maxlen)
2517 goto noredhdropt;
2518
2519 {
2520 /* redirected header option */
2521 int len;
2522 struct nd_opt_rd_hdr *nd_opt_rh;
2523
2524 /*
2525 * compute the maximum size for icmp6 redirect header option.
2526 * XXX room for auth header?
2527 */
2528 len = maxlen - (p - (u_char *)ip6);
2529 len &= ~7;
2530
2531 /* This is just for simplicity. */
2532 if (m0->m_pkthdr.len != m0->m_len) {
2533 if (m0->m_next) {
2534 m_freem(m0->m_next);
2535 m0->m_next = NULL;
2536 }
2537 m0->m_pkthdr.len = m0->m_len;
2538 }
2539
2540 /*
2541 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2542 * about padding/truncate rule for the original IP packet.
2543 * From the discussion on IPv6imp in Feb 1999, the consensus was:
2544 * - "attach as much as possible" is the goal
2545 * - pad if not aligned (original size can be guessed by original
2546 * ip6 header)
2547 * Following code adds the padding if it is simple enough,
2548 * and truncates if not.
2549 */
2550 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2551 panic("assumption failed in %s:%d", __FILE__, __LINE__);
2552
2553 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2554 /* not enough room, truncate */
2555 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2556 } else {
2557 /* enough room, pad or truncate */
2558 size_t extra;
2559
2560 extra = m0->m_pkthdr.len % 8;
2561 if (extra) {
2562 /* pad if easy enough, truncate if not */
2563 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2564 /* pad */
2565 m0->m_len += (8 - extra);
2566 m0->m_pkthdr.len += (8 - extra);
2567 } else {
2568 /* truncate */
2569 m0->m_pkthdr.len -= extra;
2570 m0->m_len -= extra;
2571 }
2572 }
2573 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2574 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2575 }
2576
2577 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2578 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2579 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2580 nd_opt_rh->nd_opt_rh_len = len >> 3;
2581 p += sizeof(*nd_opt_rh);
2582 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2583
2584 /* connect m0 to m */
2585 m->m_next = m0;
2586 m->m_pkthdr.len = m->m_len + m0->m_len;
2587 m0 = NULL;
2588 }
2589 noredhdropt:;
2590 if (m0 != NULL) {
2591 m_freem(m0);
2592 m0 = NULL;
2593 }
2594
2595 /* XXX: clear embedded link IDs in the inner header */
2596 in6_clearscope(&sip6->ip6_src);
2597 in6_clearscope(&sip6->ip6_dst);
2598 in6_clearscope(&nd_rd->nd_rd_target);
2599 in6_clearscope(&nd_rd->nd_rd_dst);
2600
2601 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2602
2603 nd_rd->nd_rd_cksum = 0;
2604 nd_rd->nd_rd_cksum
2605 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2606
2607 /* send the packet to outside... */
2608 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2609 if (outif) {
2610 icmp6_ifstat_inc(outif, ifs6_out_msg);
2611 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2612 }
2613 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2614
2615 return;
2616
2617 fail:
2618 if (m)
2619 m_freem(m);
2620 if (m0)
2621 m_freem(m0);
2622 }
2623
2624 #ifdef HAVE_NRL_INPCB
2625 #define in6pcb inpcb
2626 #define in6p_icmp6filt inp_icmp6filt
2627 #endif
2628 /*
2629 * ICMPv6 socket option processing.
2630 */
2631 void
2632 icmp6_ctloutput(netmsg_t msg)
2633 {
2634 struct socket *so = msg->ctloutput.base.nm_so;
2635 struct sockopt *sopt = msg->ctloutput.nm_sopt;
2636 int error = 0;
2637 int optlen;
2638 struct inpcb *inp = so->so_pcb;
2639 int level, op, optname;
2640
2641 if (sopt) {
2642 level = sopt->sopt_level;
2643 op = sopt->sopt_dir;
2644 optname = sopt->sopt_name;
2645 optlen = sopt->sopt_valsize;
2646 } else
2647 level = op = optname = optlen = 0;
2648
2649 if (level != IPPROTO_ICMPV6) {
2650 error = EINVAL;
2651 goto out;
2652 }
2653
2654 switch (op) {
2655 case PRCO_SETOPT:
2656 switch (optname) {
2657 case ICMP6_FILTER:
2658 {
2659 if (optlen != sizeof(struct icmp6_filter)) {
2660 error = EMSGSIZE;
2661 break;
2662 }
2663 if (inp->in6p_icmp6filt == NULL) {
2664 error = EINVAL;
2665 break;
2666 }
2667 error = soopt_to_kbuf(sopt, inp->in6p_icmp6filt, optlen,
2668 optlen);
2669 break;
2670 }
2671
2672 default:
2673 error = ENOPROTOOPT;
2674 break;
2675 }
2676 break;
2677
2678 case PRCO_GETOPT:
2679 switch (optname) {
2680 case ICMP6_FILTER:
2681 {
2682 if (inp->in6p_icmp6filt == NULL) {
2683 error = EINVAL;
2684 break;
2685 }
2686 soopt_from_kbuf(sopt, inp->in6p_icmp6filt,
2687 sizeof(struct icmp6_filter));
2688 break;
2689 }
2690
2691 default:
2692 error = ENOPROTOOPT;
2693 break;
2694 }
2695 break;
2696 }
2697 out:
2698 lwkt_replymsg(&msg->ctloutput.base.lmsg, error);
2699 }
2700 #ifdef HAVE_NRL_INPCB
2701 #undef in6pcb
2702 #undef in6p_icmp6filt
2703 #endif
2704
2705 #ifndef HAVE_PPSRATECHECK
2706 #ifndef timersub
2707 #define timersub(tvp, uvp, vvp) \
2708 do { \
2709 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
2710 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
2711 if ((vvp)->tv_usec < 0) { \
2712 (vvp)->tv_sec--; \
2713 (vvp)->tv_usec += 1000000; \
2714 } \
2715 } while (0)
2716 #endif
2717
2718 /*
2719 * ppsratecheck(): packets (or events) per second limitation.
2720 */
2721 static int
2722 ppsratecheck(struct timeval *lasttime, int *curpps,
2723 int maxpps) /* maximum pps allowed */
2724 {
2725 struct timeval tv, delta;
2726 int rv;
2727
2728 microtime(&tv);
2729
2730 timersub(&tv, lasttime, &delta);
2731
2732 /*
2733 * Check for 0,0 so that the message will be seen at least once.
2734 * If more than one second has passed since the last update of
2735 * lasttime, reset the counter.
2736 *
2737 * We do increment *curpps even in *curpps < maxpps case, as some may
2738 * try to use *curpps for stat purposes as well.
2739 */
2740 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
2741 delta.tv_sec >= 1) {
2742 *lasttime = tv;
2743 *curpps = 0;
2744 rv = 1;
2745 } else if (maxpps < 0)
2746 rv = 1;
2747 else if (*curpps < maxpps)
2748 rv = 1;
2749 else
2750 rv = 0;
2751
2752 #if 1 /* DIAGNOSTIC? */
2753 /* be careful about wrap-around */
2754 if (*curpps + 1 > *curpps)
2755 *curpps = *curpps + 1;
2756 #else
2757 /*
2758 * assume that there's not too many calls to this function.
2759 * not sure if the assumption holds, as it depends on *caller's*
2760 * behavior, not the behavior of this function.
2761 * IMHO it is wrong to make assumption on the caller's behavior,
2762 * so the above #if is #if 1, not #ifdef DIAGNOSTIC.
2763 */
2764 *curpps = *curpps + 1;
2765 #endif
2766
2767 return (rv);
2768 }
2769 #endif
2770
2771 /*
2772 * Perform rate limit check.
2773 * Returns 0 if it is okay to send the icmp6 packet.
2774 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2775 * limitation.
2776 *
2777 * XXX per-destination/type check necessary?
2778 */
2779 static int
2780 icmp6_ratelimit(const struct in6_addr *dst, /* not used at this moment */
2781 const int type, /* not used at this moment */
2782 const int code) /* not used at this moment */
2783 {
2784 int ret;
2785
2786 ret = 0; /* okay to send */
2787
2788 /* PPS limit */
2789 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2790 icmp6errppslim)) {
2791 /* The packet is subject to rate limit */
2792 ret++;
2793 }
2794
2795 return ret;
2796 }
DragonFly BSD