Remove struct ipprotosw. It's identical to protosw, so use the generic
[dragonfly.git] / sys / netinet6 / esp_input.c
CommitLineData
984263bc 1/* $FreeBSD: src/sys/netinet6/esp_input.c,v 1.1.2.8 2003/01/23 21:06:47 sam Exp $ */
4468b0b4 2/* $DragonFly: src/sys/netinet6/esp_input.c,v 1.9 2004/11/30 19:21:26 joerg Exp $ */
984263bc
MD
3/* $KAME: esp_input.c,v 1.62 2002/01/07 11:39:57 kjc Exp $ */
4
5/*
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34/*
35 * RFC1827/2406 Encapsulated Security Payload.
36 */
37
38#include "opt_inet.h"
39#include "opt_inet6.h"
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/mbuf.h>
44#include <sys/domain.h>
45#include <sys/protosw.h>
46#include <sys/socket.h>
47#include <sys/errno.h>
48#include <sys/time.h>
49#include <sys/syslog.h>
50
51#include <net/if.h>
52#include <net/route.h>
53#include <net/netisr.h>
54#include <machine/cpu.h>
55
56#include <netinet/in.h>
57#include <netinet/in_systm.h>
58#include <netinet/ip.h>
59#include <netinet/ip_var.h>
60#include <netinet/in_var.h>
61#include <netinet/ip_ecn.h>
62#ifdef INET6
63#include <netinet6/ip6_ecn.h>
64#endif
65
66#ifdef INET6
67#include <netinet/ip6.h>
68#include <netinet6/in6_pcb.h>
69#include <netinet6/ip6_var.h>
70#include <netinet/icmp6.h>
71#include <netinet6/ip6protosw.h>
72#endif
73
74#include <netinet6/ipsec.h>
75#ifdef INET6
76#include <netinet6/ipsec6.h>
77#endif
78#include <netinet6/ah.h>
79#ifdef INET6
80#include <netinet6/ah6.h>
81#endif
82#include <netinet6/esp.h>
83#ifdef INET6
84#include <netinet6/esp6.h>
85#endif
d2438d69
MD
86#include <netproto/key/key.h>
87#include <netproto/key/keydb.h>
88#include <netproto/key/key_debug.h>
984263bc
MD
89
90#include <machine/stdarg.h>
91
92#include <net/net_osdep.h>
93
94#define IPLEN_FLIPPED
95
96#define ESPMAXLEN \
97 (sizeof(struct esp) < sizeof(struct newesp) \
98 ? sizeof(struct newesp) : sizeof(struct esp))
99
100#ifdef INET
4468b0b4 101extern struct protosw inetsw[];
984263bc
MD
102
103void
a00138cb 104esp4_input(struct mbuf *m, ...)
984263bc 105{
a00138cb 106 int off, proto;
984263bc
MD
107 struct ip *ip;
108 struct esp *esp;
109 struct esptail esptail;
110 u_int32_t spi;
111 struct secasvar *sav = NULL;
112 size_t taillen;
113 u_int16_t nxt;
114 const struct esp_algorithm *algo;
115 int ivlen;
116 size_t hlen;
117 size_t esplen;
a00138cb
JS
118 __va_list ap;
119
120 __va_start(ap, m);
121 off = __va_arg(ap, int);
122 proto = __va_arg(ap, int);
123 __va_end(ap);
984263bc
MD
124
125 /* sanity check for alignment. */
126 if (off % 4 != 0 || m->m_pkthdr.len % 4 != 0) {
127 ipseclog((LOG_ERR, "IPv4 ESP input: packet alignment problem "
128 "(off=%d, pktlen=%d)\n", off, m->m_pkthdr.len));
129 ipsecstat.in_inval++;
130 goto bad;
131 }
132
133 if (m->m_len < off + ESPMAXLEN) {
134 m = m_pullup(m, off + ESPMAXLEN);
135 if (!m) {
136 ipseclog((LOG_DEBUG,
137 "IPv4 ESP input: can't pullup in esp4_input\n"));
138 ipsecstat.in_inval++;
139 goto bad;
140 }
141 }
142
143 ip = mtod(m, struct ip *);
144 esp = (struct esp *)(((u_int8_t *)ip) + off);
145#ifdef _IP_VHL
146 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
147#else
148 hlen = ip->ip_hl << 2;
149#endif
150
151 /* find the sassoc. */
152 spi = esp->esp_spi;
153
154 if ((sav = key_allocsa(AF_INET,
155 (caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst,
156 IPPROTO_ESP, spi)) == 0) {
157 ipseclog((LOG_WARNING,
158 "IPv4 ESP input: no key association found for spi %u\n",
159 (u_int32_t)ntohl(spi)));
160 ipsecstat.in_nosa++;
161 goto bad;
162 }
163 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
164 printf("DP esp4_input called to allocate SA:%p\n", sav));
165 if (sav->state != SADB_SASTATE_MATURE
166 && sav->state != SADB_SASTATE_DYING) {
167 ipseclog((LOG_DEBUG,
168 "IPv4 ESP input: non-mature/dying SA found for spi %u\n",
169 (u_int32_t)ntohl(spi)));
170 ipsecstat.in_badspi++;
171 goto bad;
172 }
173 algo = esp_algorithm_lookup(sav->alg_enc);
174 if (!algo) {
175 ipseclog((LOG_DEBUG, "IPv4 ESP input: "
176 "unsupported encryption algorithm for spi %u\n",
177 (u_int32_t)ntohl(spi)));
178 ipsecstat.in_badspi++;
179 goto bad;
180 }
181
182 /* check if we have proper ivlen information */
183 ivlen = sav->ivlen;
184 if (ivlen < 0) {
185 ipseclog((LOG_ERR, "inproper ivlen in IPv4 ESP input: %s %s\n",
186 ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
187 ipsecstat.in_inval++;
188 goto bad;
189 }
190
191 if (!((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay
192 && (sav->alg_auth && sav->key_auth)))
193 goto noreplaycheck;
194
195 if (sav->alg_auth == SADB_X_AALG_NULL ||
196 sav->alg_auth == SADB_AALG_NONE)
197 goto noreplaycheck;
198
199 /*
200 * check for sequence number.
201 */
202 if (ipsec_chkreplay(ntohl(((struct newesp *)esp)->esp_seq), sav))
203 ; /* okey */
204 else {
205 ipsecstat.in_espreplay++;
206 ipseclog((LOG_WARNING,
207 "replay packet in IPv4 ESP input: %s %s\n",
208 ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
209 goto bad;
210 }
211
212 /* check ICV */
213 {
214 u_char sum0[AH_MAXSUMSIZE];
215 u_char sum[AH_MAXSUMSIZE];
216 const struct ah_algorithm *sumalgo;
217 size_t siz;
218
219 sumalgo = ah_algorithm_lookup(sav->alg_auth);
220 if (!sumalgo)
221 goto noreplaycheck;
222 siz = (((*sumalgo->sumsiz)(sav) + 3) & ~(4 - 1));
223 if (m->m_pkthdr.len < off + ESPMAXLEN + siz) {
224 ipsecstat.in_inval++;
225 goto bad;
226 }
227 if (AH_MAXSUMSIZE < siz) {
228 ipseclog((LOG_DEBUG,
229 "internal error: AH_MAXSUMSIZE must be larger than %lu\n",
230 (u_long)siz));
231 ipsecstat.in_inval++;
232 goto bad;
233 }
234
235 m_copydata(m, m->m_pkthdr.len - siz, siz, &sum0[0]);
236
237 if (esp_auth(m, off, m->m_pkthdr.len - off - siz, sav, sum)) {
238 ipseclog((LOG_WARNING, "auth fail in IPv4 ESP input: %s %s\n",
239 ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
240 ipsecstat.in_espauthfail++;
241 goto bad;
242 }
243
244 if (bcmp(sum0, sum, siz) != 0) {
245 ipseclog((LOG_WARNING, "auth fail in IPv4 ESP input: %s %s\n",
246 ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
247 ipsecstat.in_espauthfail++;
248 goto bad;
249 }
250
251 /* strip off the authentication data */
252 m_adj(m, -siz);
253 ip = mtod(m, struct ip *);
254#ifdef IPLEN_FLIPPED
255 ip->ip_len = ip->ip_len - siz;
256#else
257 ip->ip_len = htons(ntohs(ip->ip_len) - siz);
258#endif
259 m->m_flags |= M_AUTHIPDGM;
260 ipsecstat.in_espauthsucc++;
261 }
262
263 /*
264 * update sequence number.
265 */
266 if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) {
267 if (ipsec_updatereplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) {
268 ipsecstat.in_espreplay++;
269 goto bad;
270 }
271 }
272
273noreplaycheck:
274
275 /* process main esp header. */
276 if (sav->flags & SADB_X_EXT_OLD) {
277 /* RFC 1827 */
278 esplen = sizeof(struct esp);
279 } else {
280 /* RFC 2406 */
281 if (sav->flags & SADB_X_EXT_DERIV)
282 esplen = sizeof(struct esp);
283 else
284 esplen = sizeof(struct newesp);
285 }
286
287 if (m->m_pkthdr.len < off + esplen + ivlen + sizeof(esptail)) {
288 ipseclog((LOG_WARNING,
289 "IPv4 ESP input: packet too short\n"));
290 ipsecstat.in_inval++;
291 goto bad;
292 }
293
294 if (m->m_len < off + esplen + ivlen) {
295 m = m_pullup(m, off + esplen + ivlen);
296 if (!m) {
297 ipseclog((LOG_DEBUG,
298 "IPv4 ESP input: can't pullup in esp4_input\n"));
299 ipsecstat.in_inval++;
300 goto bad;
301 }
302 }
303
304 /*
305 * pre-compute and cache intermediate key
306 */
307 if (esp_schedule(algo, sav) != 0) {
308 ipsecstat.in_inval++;
309 goto bad;
310 }
311
312 /*
313 * decrypt the packet.
314 */
315 if (!algo->decrypt)
316 panic("internal error: no decrypt function");
317 if ((*algo->decrypt)(m, off, sav, algo, ivlen)) {
318 /* m is already freed */
319 m = NULL;
320 ipseclog((LOG_ERR, "decrypt fail in IPv4 ESP input: %s\n",
321 ipsec_logsastr(sav)));
322 ipsecstat.in_inval++;
323 goto bad;
324 }
325 ipsecstat.in_esphist[sav->alg_enc]++;
326
327 m->m_flags |= M_DECRYPTED;
328
329 /*
330 * find the trailer of the ESP.
331 */
332 m_copydata(m, m->m_pkthdr.len - sizeof(esptail), sizeof(esptail),
333 (caddr_t)&esptail);
334 nxt = esptail.esp_nxt;
335 taillen = esptail.esp_padlen + sizeof(esptail);
336
337 if (m->m_pkthdr.len < taillen
338 || m->m_pkthdr.len - taillen < hlen) { /* ? */
339 ipseclog((LOG_WARNING,
340 "bad pad length in IPv4 ESP input: %s %s\n",
341 ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
342 ipsecstat.in_inval++;
343 goto bad;
344 }
345
346 /* strip off the trailing pad area. */
347 m_adj(m, -taillen);
348
349#ifdef IPLEN_FLIPPED
350 ip->ip_len = ip->ip_len - taillen;
351#else
352 ip->ip_len = htons(ntohs(ip->ip_len) - taillen);
353#endif
354
355 /* was it transmitted over the IPsec tunnel SA? */
356 if (ipsec4_tunnel_validate(m, off + esplen + ivlen, nxt, sav)) {
357 /*
358 * strip off all the headers that precedes ESP header.
359 * IP4 xx ESP IP4' payload -> IP4' payload
360 *
361 * XXX more sanity checks
362 * XXX relationship with gif?
363 */
364 u_int8_t tos;
365
366 tos = ip->ip_tos;
367 m_adj(m, off + esplen + ivlen);
368 if (m->m_len < sizeof(*ip)) {
369 m = m_pullup(m, sizeof(*ip));
370 if (!m) {
371 ipsecstat.in_inval++;
372 goto bad;
373 }
374 }
375 ip = mtod(m, struct ip *);
376 /* ECN consideration. */
377 ip_ecn_egress(ip4_ipsec_ecn, &tos, &ip->ip_tos);
378 if (!key_checktunnelsanity(sav, AF_INET,
379 (caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst)) {
380 ipseclog((LOG_ERR, "ipsec tunnel address mismatch "
381 "in IPv4 ESP input: %s %s\n",
382 ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
383 ipsecstat.in_inval++;
384 goto bad;
385 }
386
387 key_sa_recordxfer(sav, m);
388 if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0 ||
389 ipsec_addhist(m, IPPROTO_IPV4, 0) != 0) {
390 ipsecstat.in_nomem++;
391 goto bad;
392 }
393
8bde602d 394 if (netisr_queue(NETISR_IP, m)) {
984263bc 395 ipsecstat.in_inval++;
8bde602d 396 m = NULL;
984263bc
MD
397 goto bad;
398 }
8bde602d 399
984263bc
MD
400 nxt = IPPROTO_DONE;
401 } else {
402 /*
403 * strip off ESP header and IV.
404 * even in m_pulldown case, we need to strip off ESP so that
405 * we can always compute checksum for AH correctly.
406 */
407 size_t stripsiz;
408
409 stripsiz = esplen + ivlen;
410
411 ip = mtod(m, struct ip *);
412 ovbcopy((caddr_t)ip, (caddr_t)(((u_char *)ip) + stripsiz), off);
413 m->m_data += stripsiz;
414 m->m_len -= stripsiz;
415 m->m_pkthdr.len -= stripsiz;
416
417 ip = mtod(m, struct ip *);
418#ifdef IPLEN_FLIPPED
419 ip->ip_len = ip->ip_len - stripsiz;
420#else
421 ip->ip_len = htons(ntohs(ip->ip_len) - stripsiz);
422#endif
423 ip->ip_p = nxt;
424
425 key_sa_recordxfer(sav, m);
426 if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0) {
427 ipsecstat.in_nomem++;
428 goto bad;
429 }
430
431 if (nxt != IPPROTO_DONE) {
1e316d14 432 if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) &&
984263bc
MD
433 ipsec4_in_reject(m, NULL)) {
434 ipsecstat.in_polvio++;
435 goto bad;
1e316d14
JH
436 }
437 if (!ip_lengthcheck(&m)) {
438 m = NULL; /* freed in ip_lengthcheck() */
439 goto bad;
984263bc
MD
440 }
441 (*inetsw[ip_protox[nxt]].pr_input)(m, off, nxt);
442 } else
443 m_freem(m);
444 m = NULL;
445 }
446
447 if (sav) {
448 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
449 printf("DP esp4_input call free SA:%p\n", sav));
450 key_freesav(sav);
451 }
452 ipsecstat.in_success++;
453 return;
454
455bad:
456 if (sav) {
457 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
458 printf("DP esp4_input call free SA:%p\n", sav));
459 key_freesav(sav);
460 }
461 if (m)
462 m_freem(m);
463 return;
464}
465#endif /* INET */
466
467#ifdef INET6
468int
469esp6_input(mp, offp, proto)
470 struct mbuf **mp;
471 int *offp, proto;
472{
473 struct mbuf *m = *mp;
474 int off = *offp;
475 struct ip6_hdr *ip6;
476 struct esp *esp;
477 struct esptail esptail;
478 u_int32_t spi;
479 struct secasvar *sav = NULL;
480 size_t taillen;
481 u_int16_t nxt;
482 const struct esp_algorithm *algo;
483 int ivlen;
484 size_t esplen;
984263bc
MD
485
486 /* sanity check for alignment. */
487 if (off % 4 != 0 || m->m_pkthdr.len % 4 != 0) {
488 ipseclog((LOG_ERR, "IPv6 ESP input: packet alignment problem "
489 "(off=%d, pktlen=%d)\n", off, m->m_pkthdr.len));
490 ipsec6stat.in_inval++;
491 goto bad;
492 }
493
494#ifndef PULLDOWN_TEST
495 IP6_EXTHDR_CHECK(m, off, ESPMAXLEN, IPPROTO_DONE);
496 esp = (struct esp *)(mtod(m, caddr_t) + off);
497#else
498 IP6_EXTHDR_GET(esp, struct esp *, m, off, ESPMAXLEN);
499 if (esp == NULL) {
500 ipsec6stat.in_inval++;
501 return IPPROTO_DONE;
502 }
503#endif
504 ip6 = mtod(m, struct ip6_hdr *);
505
506 if (ntohs(ip6->ip6_plen) == 0) {
507 ipseclog((LOG_ERR, "IPv6 ESP input: "
508 "ESP with IPv6 jumbogram is not supported.\n"));
509 ipsec6stat.in_inval++;
510 goto bad;
511 }
512
513 /* find the sassoc. */
514 spi = esp->esp_spi;
515
516 if ((sav = key_allocsa(AF_INET6,
517 (caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst,
518 IPPROTO_ESP, spi)) == 0) {
519 ipseclog((LOG_WARNING,
520 "IPv6 ESP input: no key association found for spi %u\n",
521 (u_int32_t)ntohl(spi)));
522 ipsec6stat.in_nosa++;
523 goto bad;
524 }
525 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
526 printf("DP esp6_input called to allocate SA:%p\n", sav));
527 if (sav->state != SADB_SASTATE_MATURE
528 && sav->state != SADB_SASTATE_DYING) {
529 ipseclog((LOG_DEBUG,
530 "IPv6 ESP input: non-mature/dying SA found for spi %u\n",
531 (u_int32_t)ntohl(spi)));
532 ipsec6stat.in_badspi++;
533 goto bad;
534 }
535 algo = esp_algorithm_lookup(sav->alg_enc);
536 if (!algo) {
537 ipseclog((LOG_DEBUG, "IPv6 ESP input: "
538 "unsupported encryption algorithm for spi %u\n",
539 (u_int32_t)ntohl(spi)));
540 ipsec6stat.in_badspi++;
541 goto bad;
542 }
543
544 /* check if we have proper ivlen information */
545 ivlen = sav->ivlen;
546 if (ivlen < 0) {
547 ipseclog((LOG_ERR, "inproper ivlen in IPv6 ESP input: %s %s\n",
548 ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
549 ipsec6stat.in_badspi++;
550 goto bad;
551 }
552
553 if (!((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay
554 && (sav->alg_auth && sav->key_auth)))
555 goto noreplaycheck;
556
557 if (sav->alg_auth == SADB_X_AALG_NULL ||
558 sav->alg_auth == SADB_AALG_NONE)
559 goto noreplaycheck;
560
561 /*
562 * check for sequence number.
563 */
564 if (ipsec_chkreplay(ntohl(((struct newesp *)esp)->esp_seq), sav))
565 ; /* okey */
566 else {
567 ipsec6stat.in_espreplay++;
568 ipseclog((LOG_WARNING,
569 "replay packet in IPv6 ESP input: %s %s\n",
570 ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
571 goto bad;
572 }
573
574 /* check ICV */
575 {
576 u_char sum0[AH_MAXSUMSIZE];
577 u_char sum[AH_MAXSUMSIZE];
578 const struct ah_algorithm *sumalgo;
579 size_t siz;
580
581 sumalgo = ah_algorithm_lookup(sav->alg_auth);
582 if (!sumalgo)
583 goto noreplaycheck;
584 siz = (((*sumalgo->sumsiz)(sav) + 3) & ~(4 - 1));
585 if (m->m_pkthdr.len < off + ESPMAXLEN + siz) {
586 ipsecstat.in_inval++;
587 goto bad;
588 }
589 if (AH_MAXSUMSIZE < siz) {
590 ipseclog((LOG_DEBUG,
591 "internal error: AH_MAXSUMSIZE must be larger than %lu\n",
592 (u_long)siz));
593 ipsec6stat.in_inval++;
594 goto bad;
595 }
596
597 m_copydata(m, m->m_pkthdr.len - siz, siz, &sum0[0]);
598
599 if (esp_auth(m, off, m->m_pkthdr.len - off - siz, sav, sum)) {
600 ipseclog((LOG_WARNING, "auth fail in IPv6 ESP input: %s %s\n",
601 ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
602 ipsec6stat.in_espauthfail++;
603 goto bad;
604 }
605
606 if (bcmp(sum0, sum, siz) != 0) {
607 ipseclog((LOG_WARNING, "auth fail in IPv6 ESP input: %s %s\n",
608 ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
609 ipsec6stat.in_espauthfail++;
610 goto bad;
611 }
612
613 /* strip off the authentication data */
614 m_adj(m, -siz);
615 ip6 = mtod(m, struct ip6_hdr *);
616 ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - siz);
617
618 m->m_flags |= M_AUTHIPDGM;
619 ipsec6stat.in_espauthsucc++;
620 }
621
622 /*
623 * update sequence number.
624 */
625 if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) {
626 if (ipsec_updatereplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) {
627 ipsec6stat.in_espreplay++;
628 goto bad;
629 }
630 }
631
632noreplaycheck:
633
634 /* process main esp header. */
635 if (sav->flags & SADB_X_EXT_OLD) {
636 /* RFC 1827 */
637 esplen = sizeof(struct esp);
638 } else {
639 /* RFC 2406 */
640 if (sav->flags & SADB_X_EXT_DERIV)
641 esplen = sizeof(struct esp);
642 else
643 esplen = sizeof(struct newesp);
644 }
645
646 if (m->m_pkthdr.len < off + esplen + ivlen + sizeof(esptail)) {
647 ipseclog((LOG_WARNING,
648 "IPv6 ESP input: packet too short\n"));
649 ipsec6stat.in_inval++;
650 goto bad;
651 }
652
653#ifndef PULLDOWN_TEST
654 IP6_EXTHDR_CHECK(m, off, esplen + ivlen, IPPROTO_DONE); /* XXX */
655#else
656 IP6_EXTHDR_GET(esp, struct esp *, m, off, esplen + ivlen);
657 if (esp == NULL) {
658 ipsec6stat.in_inval++;
659 m = NULL;
660 goto bad;
661 }
662#endif
663 ip6 = mtod(m, struct ip6_hdr *); /* set it again just in case */
664
665 /*
666 * pre-compute and cache intermediate key
667 */
668 if (esp_schedule(algo, sav) != 0) {
669 ipsec6stat.in_inval++;
670 goto bad;
671 }
672
673 /*
674 * decrypt the packet.
675 */
676 if (!algo->decrypt)
677 panic("internal error: no decrypt function");
678 if ((*algo->decrypt)(m, off, sav, algo, ivlen)) {
679 /* m is already freed */
680 m = NULL;
681 ipseclog((LOG_ERR, "decrypt fail in IPv6 ESP input: %s\n",
682 ipsec_logsastr(sav)));
683 ipsec6stat.in_inval++;
684 goto bad;
685 }
686 ipsec6stat.in_esphist[sav->alg_enc]++;
687
688 m->m_flags |= M_DECRYPTED;
689
690 /*
691 * find the trailer of the ESP.
692 */
693 m_copydata(m, m->m_pkthdr.len - sizeof(esptail), sizeof(esptail),
694 (caddr_t)&esptail);
695 nxt = esptail.esp_nxt;
696 taillen = esptail.esp_padlen + sizeof(esptail);
697
698 if (m->m_pkthdr.len < taillen
699 || m->m_pkthdr.len - taillen < sizeof(struct ip6_hdr)) { /* ? */
700 ipseclog((LOG_WARNING,
701 "bad pad length in IPv6 ESP input: %s %s\n",
702 ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
703 ipsec6stat.in_inval++;
704 goto bad;
705 }
706
707 /* strip off the trailing pad area. */
708 m_adj(m, -taillen);
709
710 ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - taillen);
711
712 /* was it transmitted over the IPsec tunnel SA? */
713 if (ipsec6_tunnel_validate(m, off + esplen + ivlen, nxt, sav)) {
714 /*
715 * strip off all the headers that precedes ESP header.
716 * IP6 xx ESP IP6' payload -> IP6' payload
717 *
718 * XXX more sanity checks
719 * XXX relationship with gif?
720 */
721 u_int32_t flowinfo; /* net endian */
722 flowinfo = ip6->ip6_flow;
723 m_adj(m, off + esplen + ivlen);
724 if (m->m_len < sizeof(*ip6)) {
725#ifndef PULLDOWN_TEST
726 /*
727 * m_pullup is prohibited in KAME IPv6 input processing
728 * but there's no other way!
729 */
730#else
731 /* okay to pullup in m_pulldown style */
732#endif
733 m = m_pullup(m, sizeof(*ip6));
734 if (!m) {
735 ipsec6stat.in_inval++;
736 goto bad;
737 }
738 }
739 ip6 = mtod(m, struct ip6_hdr *);
740 /* ECN consideration. */
741 ip6_ecn_egress(ip6_ipsec_ecn, &flowinfo, &ip6->ip6_flow);
742 if (!key_checktunnelsanity(sav, AF_INET6,
743 (caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst)) {
744 ipseclog((LOG_ERR, "ipsec tunnel address mismatch "
745 "in IPv6 ESP input: %s %s\n",
746 ipsec6_logpacketstr(ip6, spi),
747 ipsec_logsastr(sav)));
748 ipsec6stat.in_inval++;
749 goto bad;
750 }
751
752 key_sa_recordxfer(sav, m);
753 if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0 ||
754 ipsec_addhist(m, IPPROTO_IPV6, 0) != 0) {
755 ipsec6stat.in_nomem++;
756 goto bad;
757 }
758
8bde602d 759 if (netisr_queue(NETISR_IPV6, m)) {
984263bc 760 ipsec6stat.in_inval++;
8bde602d 761 m = NULL;
984263bc
MD
762 goto bad;
763 }
8bde602d 764
984263bc
MD
765 nxt = IPPROTO_DONE;
766 } else {
767 /*
768 * strip off ESP header and IV.
769 * even in m_pulldown case, we need to strip off ESP so that
770 * we can always compute checksum for AH correctly.
771 */
772 size_t stripsiz;
773 char *prvnxtp;
774
775 /*
776 * Set the next header field of the previous header correctly.
777 */
778 prvnxtp = ip6_get_prevhdr(m, off); /* XXX */
779 *prvnxtp = nxt;
780
781 stripsiz = esplen + ivlen;
782
783 ip6 = mtod(m, struct ip6_hdr *);
784 if (m->m_len >= stripsiz + off) {
785 ovbcopy((caddr_t)ip6, ((caddr_t)ip6) + stripsiz, off);
786 m->m_data += stripsiz;
787 m->m_len -= stripsiz;
788 m->m_pkthdr.len -= stripsiz;
789 } else {
790 /*
791 * this comes with no copy if the boundary is on
792 * cluster
793 */
794 struct mbuf *n;
795
74f1caca 796 n = m_split(m, off, MB_DONTWAIT);
984263bc
MD
797 if (n == NULL) {
798 /* m is retained by m_split */
799 goto bad;
800 }
801 m_adj(n, stripsiz);
802 m_cat(m, n);
803 /* m_cat does not update m_pkthdr.len */
804 m->m_pkthdr.len += n->m_pkthdr.len;
805 }
806
807#ifndef PULLDOWN_TEST
808 /*
809 * KAME requires that the packet to be contiguous on the
810 * mbuf. We need to make that sure.
811 * this kind of code should be avoided.
812 * XXX other conditions to avoid running this part?
813 */
814 if (m->m_len != m->m_pkthdr.len) {
815 struct mbuf *n = NULL;
816 int maxlen;
817
74f1caca 818 MGETHDR(n, MB_DONTWAIT, MT_HEADER);
984263bc
MD
819 maxlen = MHLEN;
820 if (n)
821 M_MOVE_PKTHDR(n, m);
822 if (n && n->m_pkthdr.len > maxlen) {
74f1caca 823 MCLGET(n, MB_DONTWAIT);
984263bc
MD
824 maxlen = MCLBYTES;
825 if ((n->m_flags & M_EXT) == 0) {
826 m_free(n);
827 n = NULL;
828 }
829 }
830 if (!n) {
831 printf("esp6_input: mbuf allocation failed\n");
832 goto bad;
833 }
834
835 if (n->m_pkthdr.len <= maxlen) {
836 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
837 n->m_len = n->m_pkthdr.len;
838 n->m_next = NULL;
839 m_freem(m);
840 } else {
841 m_copydata(m, 0, maxlen, mtod(n, caddr_t));
842 n->m_len = maxlen;
843 n->m_next = m;
844 m_adj(m, maxlen);
845 }
846 m = n;
847 }
848#endif
849
850 ip6 = mtod(m, struct ip6_hdr *);
851 ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - stripsiz);
852
853 key_sa_recordxfer(sav, m);
854 if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0) {
855 ipsec6stat.in_nomem++;
856 goto bad;
857 }
858 }
859
860 *offp = off;
861 *mp = m;
862
863 if (sav) {
864 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
865 printf("DP esp6_input call free SA:%p\n", sav));
866 key_freesav(sav);
867 }
868 ipsec6stat.in_success++;
869 return nxt;
870
871bad:
872 if (sav) {
873 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
874 printf("DP esp6_input call free SA:%p\n", sav));
875 key_freesav(sav);
876 }
877 if (m)
878 m_freem(m);
879 return IPPROTO_DONE;
880}
881
882void
883esp6_ctlinput(cmd, sa, d)
884 int cmd;
885 struct sockaddr *sa;
886 void *d;
887{
888 const struct newesp *espp;
889 struct newesp esp;
890 struct ip6ctlparam *ip6cp = NULL, ip6cp1;
891 struct secasvar *sav;
892 struct ip6_hdr *ip6;
893 struct mbuf *m;
894 int off;
895 struct sockaddr_in6 *sa6_src, *sa6_dst;
896
897 if (sa->sa_family != AF_INET6 ||
898 sa->sa_len != sizeof(struct sockaddr_in6))
899 return;
900 if ((unsigned)cmd >= PRC_NCMDS)
901 return;
902
903 /* if the parameter is from icmp6, decode it. */
904 if (d != NULL) {
905 ip6cp = (struct ip6ctlparam *)d;
906 m = ip6cp->ip6c_m;
907 ip6 = ip6cp->ip6c_ip6;
908 off = ip6cp->ip6c_off;
909 } else {
910 m = NULL;
911 ip6 = NULL;
f15db79e 912 off = 0; /* fix warning */
984263bc
MD
913 }
914
915 if (ip6) {
916 /*
917 * Notify the error to all possible sockets via pfctlinput2.
918 * Since the upper layer information (such as protocol type,
919 * source and destination ports) is embedded in the encrypted
920 * data and might have been cut, we can't directly call
921 * an upper layer ctlinput function. However, the pcbnotify
922 * function will consider source and destination addresses
923 * as well as the flow info value, and may be able to find
924 * some PCB that should be notified.
925 * Although pfctlinput2 will call esp6_ctlinput(), there is
926 * no possibility of an infinite loop of function calls,
927 * because we don't pass the inner IPv6 header.
928 */
929 bzero(&ip6cp1, sizeof(ip6cp1));
930 ip6cp1.ip6c_src = ip6cp->ip6c_src;
931 pfctlinput2(cmd, sa, (void *)&ip6cp1);
932
933 /*
934 * Then go to special cases that need ESP header information.
935 * XXX: We assume that when ip6 is non NULL,
936 * M and OFF are valid.
937 */
938
939 /* check if we can safely examine src and dst ports */
940 if (m->m_pkthdr.len < off + sizeof(esp))
941 return;
942
943 if (m->m_len < off + sizeof(esp)) {
944 /*
945 * this should be rare case,
946 * so we compromise on this copy...
947 */
948 m_copydata(m, off, sizeof(esp), (caddr_t)&esp);
949 espp = &esp;
950 } else
951 espp = (struct newesp*)(mtod(m, caddr_t) + off);
952
953 if (cmd == PRC_MSGSIZE) {
954 int valid = 0;
955
956 /*
957 * Check to see if we have a valid SA corresponding to
958 * the address in the ICMP message payload.
959 */
960 sa6_src = ip6cp->ip6c_src;
961 sa6_dst = (struct sockaddr_in6 *)sa;
962 sav = key_allocsa(AF_INET6,
963 (caddr_t)&sa6_src->sin6_addr,
964 (caddr_t)&sa6_dst->sin6_addr,
965 IPPROTO_ESP, espp->esp_spi);
966 if (sav) {
967 if (sav->state == SADB_SASTATE_MATURE ||
968 sav->state == SADB_SASTATE_DYING)
969 valid++;
970 key_freesav(sav);
971 }
972
973 /* XXX Further validation? */
974
975 /*
976 * Depending on the value of "valid" and routing table
977 * size (mtudisc_{hi,lo}wat), we will:
978 * - recalcurate the new MTU and create the
979 * corresponding routing entry, or
980 * - ignore the MTU change notification.
981 */
982 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid);
983 }
984 } else {
985 /* we normally notify any pcb here */
986 }
987}
988#endif /* INET6 */