1 /* $FreeBSD: src/sys/netinet6/esp_input.c,v 1.1.2.8 2003/01/23 21:06:47 sam Exp $ */
2 /* $DragonFly: src/sys/netinet6/esp_input.c,v 1.9 2004/11/30 19:21:26 joerg Exp $ */
3 /* $KAME: esp_input.c,v 1.62 2002/01/07 11:39:57 kjc Exp $ */
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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
35 * RFC1827/2406 Encapsulated Security Payload.
39 #include "opt_inet6.h"
41 #include <sys/param.h>
42 #include <sys/systm.h>
44 #include <sys/domain.h>
45 #include <sys/protosw.h>
46 #include <sys/socket.h>
47 #include <sys/errno.h>
49 #include <sys/syslog.h>
52 #include <net/route.h>
53 #include <net/netisr.h>
54 #include <machine/cpu.h>
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>
63 #include <netinet6/ip6_ecn.h>
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>
74 #include <netinet6/ipsec.h>
76 #include <netinet6/ipsec6.h>
78 #include <netinet6/ah.h>
80 #include <netinet6/ah6.h>
82 #include <netinet6/esp.h>
84 #include <netinet6/esp6.h>
86 #include <netproto/key/key.h>
87 #include <netproto/key/keydb.h>
88 #include <netproto/key/key_debug.h>
90 #include <machine/stdarg.h>
92 #include <net/net_osdep.h>
97 (sizeof(struct esp) < sizeof(struct newesp) \
98 ? sizeof(struct newesp) : sizeof(struct esp))
101 extern struct protosw inetsw[];
104 esp4_input(struct mbuf *m, ...)
109 struct esptail esptail;
111 struct secasvar *sav = NULL;
114 const struct esp_algorithm *algo;
121 off = __va_arg(ap, int);
122 proto = __va_arg(ap, int);
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++;
133 if (m->m_len < off + ESPMAXLEN) {
134 m = m_pullup(m, off + ESPMAXLEN);
137 "IPv4 ESP input: can't pullup in esp4_input\n"));
138 ipsecstat.in_inval++;
143 ip = mtod(m, struct ip *);
144 esp = (struct esp *)(((u_int8_t *)ip) + off);
146 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
148 hlen = ip->ip_hl << 2;
151 /* find the sassoc. */
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)));
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) {
168 "IPv4 ESP input: non-mature/dying SA found for spi %u\n",
169 (u_int32_t)ntohl(spi)));
170 ipsecstat.in_badspi++;
173 algo = esp_algorithm_lookup(sav->alg_enc);
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++;
182 /* check if we have proper ivlen information */
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++;
191 if (!((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay
192 && (sav->alg_auth && sav->key_auth)))
195 if (sav->alg_auth == SADB_X_AALG_NULL ||
196 sav->alg_auth == SADB_AALG_NONE)
200 * check for sequence number.
202 if (ipsec_chkreplay(ntohl(((struct newesp *)esp)->esp_seq), sav))
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)));
214 u_char sum0[AH_MAXSUMSIZE];
215 u_char sum[AH_MAXSUMSIZE];
216 const struct ah_algorithm *sumalgo;
219 sumalgo = ah_algorithm_lookup(sav->alg_auth);
222 siz = (((*sumalgo->sumsiz)(sav) + 3) & ~(4 - 1));
223 if (m->m_pkthdr.len < off + ESPMAXLEN + siz) {
224 ipsecstat.in_inval++;
227 if (AH_MAXSUMSIZE < siz) {
229 "internal error: AH_MAXSUMSIZE must be larger than %lu\n",
231 ipsecstat.in_inval++;
235 m_copydata(m, m->m_pkthdr.len - siz, siz, &sum0[0]);
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++;
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++;
251 /* strip off the authentication data */
253 ip = mtod(m, struct ip *);
255 ip->ip_len = ip->ip_len - siz;
257 ip->ip_len = htons(ntohs(ip->ip_len) - siz);
259 m->m_flags |= M_AUTHIPDGM;
260 ipsecstat.in_espauthsucc++;
264 * update sequence number.
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++;
275 /* process main esp header. */
276 if (sav->flags & SADB_X_EXT_OLD) {
278 esplen = sizeof(struct esp);
281 if (sav->flags & SADB_X_EXT_DERIV)
282 esplen = sizeof(struct esp);
284 esplen = sizeof(struct newesp);
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++;
294 if (m->m_len < off + esplen + ivlen) {
295 m = m_pullup(m, off + esplen + ivlen);
298 "IPv4 ESP input: can't pullup in esp4_input\n"));
299 ipsecstat.in_inval++;
305 * pre-compute and cache intermediate key
307 if (esp_schedule(algo, sav) != 0) {
308 ipsecstat.in_inval++;
313 * decrypt the packet.
316 panic("internal error: no decrypt function");
317 if ((*algo->decrypt)(m, off, sav, algo, ivlen)) {
318 /* m is already freed */
320 ipseclog((LOG_ERR, "decrypt fail in IPv4 ESP input: %s\n",
321 ipsec_logsastr(sav)));
322 ipsecstat.in_inval++;
325 ipsecstat.in_esphist[sav->alg_enc]++;
327 m->m_flags |= M_DECRYPTED;
330 * find the trailer of the ESP.
332 m_copydata(m, m->m_pkthdr.len - sizeof(esptail), sizeof(esptail),
334 nxt = esptail.esp_nxt;
335 taillen = esptail.esp_padlen + sizeof(esptail);
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++;
346 /* strip off the trailing pad area. */
350 ip->ip_len = ip->ip_len - taillen;
352 ip->ip_len = htons(ntohs(ip->ip_len) - taillen);
355 /* was it transmitted over the IPsec tunnel SA? */
356 if (ipsec4_tunnel_validate(m, off + esplen + ivlen, nxt, sav)) {
358 * strip off all the headers that precedes ESP header.
359 * IP4 xx ESP IP4' payload -> IP4' payload
361 * XXX more sanity checks
362 * XXX relationship with gif?
367 m_adj(m, off + esplen + ivlen);
368 if (m->m_len < sizeof(*ip)) {
369 m = m_pullup(m, sizeof(*ip));
371 ipsecstat.in_inval++;
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++;
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++;
394 if (netisr_queue(NETISR_IP, m)) {
395 ipsecstat.in_inval++;
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.
409 stripsiz = esplen + ivlen;
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;
417 ip = mtod(m, struct ip *);
419 ip->ip_len = ip->ip_len - stripsiz;
421 ip->ip_len = htons(ntohs(ip->ip_len) - stripsiz);
425 key_sa_recordxfer(sav, m);
426 if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0) {
427 ipsecstat.in_nomem++;
431 if (nxt != IPPROTO_DONE) {
432 if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) &&
433 ipsec4_in_reject(m, NULL)) {
434 ipsecstat.in_polvio++;
437 if (!ip_lengthcheck(&m)) {
438 m = NULL; /* freed in ip_lengthcheck() */
441 (*inetsw[ip_protox[nxt]].pr_input)(m, off, nxt);
448 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
449 printf("DP esp4_input call free SA:%p\n", sav));
452 ipsecstat.in_success++;
457 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
458 printf("DP esp4_input call free SA:%p\n", sav));
469 esp6_input(mp, offp, proto)
473 struct mbuf *m = *mp;
477 struct esptail esptail;
479 struct secasvar *sav = NULL;
482 const struct esp_algorithm *algo;
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++;
494 #ifndef PULLDOWN_TEST
495 IP6_EXTHDR_CHECK(m, off, ESPMAXLEN, IPPROTO_DONE);
496 esp = (struct esp *)(mtod(m, caddr_t) + off);
498 IP6_EXTHDR_GET(esp, struct esp *, m, off, ESPMAXLEN);
500 ipsec6stat.in_inval++;
504 ip6 = mtod(m, struct ip6_hdr *);
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++;
513 /* find the sassoc. */
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++;
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) {
530 "IPv6 ESP input: non-mature/dying SA found for spi %u\n",
531 (u_int32_t)ntohl(spi)));
532 ipsec6stat.in_badspi++;
535 algo = esp_algorithm_lookup(sav->alg_enc);
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++;
544 /* check if we have proper ivlen information */
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++;
553 if (!((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay
554 && (sav->alg_auth && sav->key_auth)))
557 if (sav->alg_auth == SADB_X_AALG_NULL ||
558 sav->alg_auth == SADB_AALG_NONE)
562 * check for sequence number.
564 if (ipsec_chkreplay(ntohl(((struct newesp *)esp)->esp_seq), sav))
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)));
576 u_char sum0[AH_MAXSUMSIZE];
577 u_char sum[AH_MAXSUMSIZE];
578 const struct ah_algorithm *sumalgo;
581 sumalgo = ah_algorithm_lookup(sav->alg_auth);
584 siz = (((*sumalgo->sumsiz)(sav) + 3) & ~(4 - 1));
585 if (m->m_pkthdr.len < off + ESPMAXLEN + siz) {
586 ipsecstat.in_inval++;
589 if (AH_MAXSUMSIZE < siz) {
591 "internal error: AH_MAXSUMSIZE must be larger than %lu\n",
593 ipsec6stat.in_inval++;
597 m_copydata(m, m->m_pkthdr.len - siz, siz, &sum0[0]);
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++;
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++;
613 /* strip off the authentication data */
615 ip6 = mtod(m, struct ip6_hdr *);
616 ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - siz);
618 m->m_flags |= M_AUTHIPDGM;
619 ipsec6stat.in_espauthsucc++;
623 * update sequence number.
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++;
634 /* process main esp header. */
635 if (sav->flags & SADB_X_EXT_OLD) {
637 esplen = sizeof(struct esp);
640 if (sav->flags & SADB_X_EXT_DERIV)
641 esplen = sizeof(struct esp);
643 esplen = sizeof(struct newesp);
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++;
653 #ifndef PULLDOWN_TEST
654 IP6_EXTHDR_CHECK(m, off, esplen + ivlen, IPPROTO_DONE); /* XXX */
656 IP6_EXTHDR_GET(esp, struct esp *, m, off, esplen + ivlen);
658 ipsec6stat.in_inval++;
663 ip6 = mtod(m, struct ip6_hdr *); /* set it again just in case */
666 * pre-compute and cache intermediate key
668 if (esp_schedule(algo, sav) != 0) {
669 ipsec6stat.in_inval++;
674 * decrypt the packet.
677 panic("internal error: no decrypt function");
678 if ((*algo->decrypt)(m, off, sav, algo, ivlen)) {
679 /* m is already freed */
681 ipseclog((LOG_ERR, "decrypt fail in IPv6 ESP input: %s\n",
682 ipsec_logsastr(sav)));
683 ipsec6stat.in_inval++;
686 ipsec6stat.in_esphist[sav->alg_enc]++;
688 m->m_flags |= M_DECRYPTED;
691 * find the trailer of the ESP.
693 m_copydata(m, m->m_pkthdr.len - sizeof(esptail), sizeof(esptail),
695 nxt = esptail.esp_nxt;
696 taillen = esptail.esp_padlen + sizeof(esptail);
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++;
707 /* strip off the trailing pad area. */
710 ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - taillen);
712 /* was it transmitted over the IPsec tunnel SA? */
713 if (ipsec6_tunnel_validate(m, off + esplen + ivlen, nxt, sav)) {
715 * strip off all the headers that precedes ESP header.
716 * IP6 xx ESP IP6' payload -> IP6' payload
718 * XXX more sanity checks
719 * XXX relationship with gif?
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
727 * m_pullup is prohibited in KAME IPv6 input processing
728 * but there's no other way!
731 /* okay to pullup in m_pulldown style */
733 m = m_pullup(m, sizeof(*ip6));
735 ipsec6stat.in_inval++;
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++;
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++;
759 if (netisr_queue(NETISR_IPV6, m)) {
760 ipsec6stat.in_inval++;
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.
776 * Set the next header field of the previous header correctly.
778 prvnxtp = ip6_get_prevhdr(m, off); /* XXX */
781 stripsiz = esplen + ivlen;
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;
791 * this comes with no copy if the boundary is on
796 n = m_split(m, off, MB_DONTWAIT);
798 /* m is retained by m_split */
803 /* m_cat does not update m_pkthdr.len */
804 m->m_pkthdr.len += n->m_pkthdr.len;
807 #ifndef PULLDOWN_TEST
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?
814 if (m->m_len != m->m_pkthdr.len) {
815 struct mbuf *n = NULL;
818 MGETHDR(n, MB_DONTWAIT, MT_HEADER);
822 if (n && n->m_pkthdr.len > maxlen) {
823 MCLGET(n, MB_DONTWAIT);
825 if ((n->m_flags & M_EXT) == 0) {
831 printf("esp6_input: mbuf allocation failed\n");
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;
841 m_copydata(m, 0, maxlen, mtod(n, caddr_t));
850 ip6 = mtod(m, struct ip6_hdr *);
851 ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - stripsiz);
853 key_sa_recordxfer(sav, m);
854 if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0) {
855 ipsec6stat.in_nomem++;
864 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
865 printf("DP esp6_input call free SA:%p\n", sav));
868 ipsec6stat.in_success++;
873 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
874 printf("DP esp6_input call free SA:%p\n", sav));
883 esp6_ctlinput(cmd, sa, d)
888 const struct newesp *espp;
890 struct ip6ctlparam *ip6cp = NULL, ip6cp1;
891 struct secasvar *sav;
895 struct sockaddr_in6 *sa6_src, *sa6_dst;
897 if (sa->sa_family != AF_INET6 ||
898 sa->sa_len != sizeof(struct sockaddr_in6))
900 if ((unsigned)cmd >= PRC_NCMDS)
903 /* if the parameter is from icmp6, decode it. */
905 ip6cp = (struct ip6ctlparam *)d;
907 ip6 = ip6cp->ip6c_ip6;
908 off = ip6cp->ip6c_off;
912 off = 0; /* fix warning */
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.
929 bzero(&ip6cp1, sizeof(ip6cp1));
930 ip6cp1.ip6c_src = ip6cp->ip6c_src;
931 pfctlinput2(cmd, sa, (void *)&ip6cp1);
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.
939 /* check if we can safely examine src and dst ports */
940 if (m->m_pkthdr.len < off + sizeof(esp))
943 if (m->m_len < off + sizeof(esp)) {
945 * this should be rare case,
946 * so we compromise on this copy...
948 m_copydata(m, off, sizeof(esp), (caddr_t)&esp);
951 espp = (struct newesp*)(mtod(m, caddr_t) + off);
953 if (cmd == PRC_MSGSIZE) {
957 * Check to see if we have a valid SA corresponding to
958 * the address in the ICMP message payload.
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);
967 if (sav->state == SADB_SASTATE_MATURE ||
968 sav->state == SADB_SASTATE_DYING)
973 /* XXX Further validation? */
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.
982 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid);
985 /* we normally notify any pcb here */