2 /* $OpenBSD: ipsec_input.c,v 1.63 2003/02/20 18:35:43 deraadt Exp $ */
4 * The authors of this code are John Ioannidis (ji@tla.org),
5 * Angelos D. Keromytis (kermit@csd.uch.gr) and
6 * Niels Provos (provos@physnet.uni-hamburg.de).
8 * This code was written by John Ioannidis for BSD/OS in Athens, Greece,
11 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
12 * by Angelos D. Keromytis.
14 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
17 * Additional features in 1999 by Angelos D. Keromytis.
19 * Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
20 * Angelos D. Keromytis and Niels Provos.
21 * Copyright (c) 2001, Angelos D. Keromytis.
23 * Permission to use, copy, and modify this software with or without fee
24 * is hereby granted, provided that this entire notice is included in
25 * all copies of any software which is or includes a copy or
26 * modification of this software.
27 * You may use this code under the GNU public license if you so wish. Please
28 * contribute changes back to the authors under this freer than GPL license
29 * so that we may further the use of strong encryption without limitations to
32 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
33 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
34 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
35 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
40 * IPsec input processing.
44 #include "opt_inet6.h"
45 #include "opt_ipsec.h"
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/malloc.h>
52 #include <sys/domain.h>
53 #include <sys/protosw.h>
54 #include <sys/socket.h>
55 #include <sys/errno.h>
56 #include <sys/syslog.h>
60 #include <net/route.h>
61 #include <net/netisr.h>
64 #include <netinet/in.h>
65 #include <netinet/in_systm.h>
66 #include <netinet/ip.h>
67 #include <netinet/ip_var.h>
68 #include <netinet/in_var.h>
70 #include <netinet/ip6.h>
72 #include <netinet6/ip6_var.h>
74 #include <netinet/in_pcb.h>
76 #include <netinet/icmp6.h>
79 #include <netipsec/ipsec.h>
81 #include <netipsec/ipsec6.h>
83 #include <netipsec/ah_var.h>
84 #include <netipsec/esp.h>
85 #include <netipsec/esp_var.h>
86 #include <netipsec/ipcomp_var.h>
88 #include <netipsec/key.h>
89 #include <netipsec/keydb.h>
91 #include <netipsec/xform.h>
92 #include <netinet6/ip6protosw.h>
94 #include <machine/in_cksum.h>
95 #include <machine/stdarg.h>
98 #include <net/if_enc.h>
102 #define IPSEC_ISTAT(p,x,y,z) ((p) == IPPROTO_ESP ? (x)++ : \
103 (p) == IPPROTO_AH ? (y)++ : (z)++)
106 static void ipsec4_common_ctlinput(int, struct sockaddr *, void *, int);
110 * ipsec_common_input gets called when an IPsec-protected packet
111 * is received by IPv4 or IPv6. Its job is to find the right SA
112 * and call the appropriate transform. The transform callback
113 * takes care of further processing (like ingress filtering).
116 ipsec_common_input(struct mbuf *m, int skip, int protoff, int af, int sproto)
118 union sockaddr_union dst_address;
119 struct secasvar *sav;
128 IPSEC_ISTAT(sproto, V_espstat.esps_input, V_ahstat.ahs_input,
129 V_ipcompstat.ipcomps_input);
131 IPSEC_ASSERT(m != NULL, ("null packet"));
133 IPSEC_ASSERT(sproto == IPPROTO_ESP || sproto == IPPROTO_AH ||
134 sproto == IPPROTO_IPCOMP,
135 ("unexpected security protocol %u", sproto));
137 if ((sproto == IPPROTO_ESP && !V_esp_enable) ||
138 (sproto == IPPROTO_AH && !V_ah_enable) ||
139 (sproto == IPPROTO_IPCOMP && !V_ipcomp_enable)) {
141 IPSEC_ISTAT(sproto, V_espstat.esps_pdrops, V_ahstat.ahs_pdrops,
142 V_ipcompstat.ipcomps_pdrops);
146 if (m->m_pkthdr.len - skip < 2 * sizeof (u_int32_t)) {
148 IPSEC_ISTAT(sproto, V_espstat.esps_hdrops, V_ahstat.ahs_hdrops,
149 V_ipcompstat.ipcomps_hdrops);
150 DPRINTF(("%s: packet too small\n", __func__));
154 /* Retrieve the SPI from the relevant IPsec header */
155 if (sproto == IPPROTO_ESP)
156 m_copydata(m, skip, sizeof(u_int32_t), (caddr_t) &spi);
157 else if (sproto == IPPROTO_AH)
158 m_copydata(m, skip + sizeof(u_int32_t), sizeof(u_int32_t),
160 else if (sproto == IPPROTO_IPCOMP) {
162 m_copydata(m, skip + sizeof(u_int16_t), sizeof(u_int16_t),
164 spi = ntohl(htons(cpi));
168 * Find the SA and (indirectly) call the appropriate
169 * kernel crypto routine. The resulting mbuf chain is a valid
170 * IP packet ready to go through input processing.
172 bzero(&dst_address, sizeof (dst_address));
173 dst_address.sa.sa_family = af;
177 dst_address.sin.sin_len = sizeof(struct sockaddr_in);
178 m_copydata(m, offsetof(struct ip, ip_dst),
179 sizeof(struct in_addr),
180 (caddr_t) &dst_address.sin.sin_addr);
182 /* Find the source port for NAT-T; see udp*_espdecap. */
183 tag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS, NULL);
185 dst_address.sin.sin_port = ((u_int16_t *)(tag + 1))[1];
186 #endif /* IPSEC_NAT_T */
191 dst_address.sin6.sin6_len = sizeof(struct sockaddr_in6);
192 m_copydata(m, offsetof(struct ip6_hdr, ip6_dst),
193 sizeof(struct in6_addr),
194 (caddr_t) &dst_address.sin6.sin6_addr);
198 DPRINTF(("%s: unsupported protocol family %u\n", __func__, af));
200 IPSEC_ISTAT(sproto, V_espstat.esps_nopf, V_ahstat.ahs_nopf,
201 V_ipcompstat.ipcomps_nopf);
205 /* NB: only pass dst since key_allocsa follows RFC2401 */
206 sav = KEY_ALLOCSA(&dst_address, sproto, spi);
208 DPRINTF(("%s: no key association found for SA %s/%08lx/%u\n",
209 __func__, ipsec_address(&dst_address),
210 (u_long) ntohl(spi), sproto));
211 IPSEC_ISTAT(sproto, V_espstat.esps_notdb, V_ahstat.ahs_notdb,
212 V_ipcompstat.ipcomps_notdb);
217 if (sav->tdb_xform == NULL) {
218 DPRINTF(("%s: attempted to use uninitialized SA %s/%08lx/%u\n",
219 __func__, ipsec_address(&dst_address),
220 (u_long) ntohl(spi), sproto));
221 IPSEC_ISTAT(sproto, V_espstat.esps_noxform, V_ahstat.ahs_noxform,
222 V_ipcompstat.ipcomps_noxform);
229 * Call appropriate transform and return -- callback takes care of
232 error = (*sav->tdb_xform->xf_input)(m, sav, skip, protoff);
239 * Common input handler for IPv4 AH, ESP, and IPCOMP.
242 ipsec4_common_input(struct mbuf *m, ...)
248 off = va_arg(ap, int);
249 nxt = va_arg(ap, int);
252 return ipsec_common_input(m, off, offsetof(struct ip, ip_p),
257 ah4_input(struct mbuf *m, int off)
259 ipsec4_common_input(m, off, IPPROTO_AH);
262 ah4_ctlinput(int cmd, struct sockaddr *sa, void *v)
264 if (sa->sa_family == AF_INET &&
265 sa->sa_len == sizeof(struct sockaddr_in))
266 ipsec4_common_ctlinput(cmd, sa, v, IPPROTO_AH);
270 esp4_input(struct mbuf *m, int off)
272 ipsec4_common_input(m, off, IPPROTO_ESP);
275 esp4_ctlinput(int cmd, struct sockaddr *sa, void *v)
277 if (sa->sa_family == AF_INET &&
278 sa->sa_len == sizeof(struct sockaddr_in))
279 ipsec4_common_ctlinput(cmd, sa, v, IPPROTO_ESP);
283 ipcomp4_input(struct mbuf *m, int off)
285 ipsec4_common_input(m, off, IPPROTO_IPCOMP);
289 * IPsec input callback for INET protocols.
290 * This routine is called as the transform callback.
291 * Takes care of filtering and other sanity checks on
292 * the processed packet.
295 ipsec4_common_input_cb(struct mbuf *m, struct secasvar *sav,
296 int skip, int protoff, struct m_tag *mt)
298 int prot, af, sproto;
301 struct tdb_ident *tdbi;
302 struct secasindex *saidx;
306 char ip6buf[INET6_ADDRSTRLEN];
310 IPSEC_ASSERT(m != NULL, ("null mbuf"));
311 IPSEC_ASSERT(sav != NULL, ("null SA"));
312 IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
313 saidx = &sav->sah->saidx;
314 af = saidx->dst.sa.sa_family;
315 IPSEC_ASSERT(af == AF_INET, ("unexpected af %u", af));
316 sproto = saidx->proto;
317 IPSEC_ASSERT(sproto == IPPROTO_ESP || sproto == IPPROTO_AH ||
318 sproto == IPPROTO_IPCOMP,
319 ("unexpected security protocol %u", sproto));
323 DPRINTF(("%s: null mbuf", __func__));
324 IPSEC_ISTAT(sproto, V_espstat.esps_badkcr, V_ahstat.ahs_badkcr,
325 V_ipcompstat.ipcomps_badkcr);
331 /* Fix IPv4 header */
332 if (m->m_len < skip && (m = m_pullup(m, skip)) == NULL) {
333 DPRINTF(("%s: processing failed for SA %s/%08lx\n",
334 __func__, ipsec_address(&sav->sah->saidx.dst),
335 (u_long) ntohl(sav->spi)));
336 IPSEC_ISTAT(sproto, V_espstat.esps_hdrops, V_ahstat.ahs_hdrops,
337 V_ipcompstat.ipcomps_hdrops);
342 ip = mtod(m, struct ip *);
343 ip->ip_len = htons(m->m_pkthdr.len);
344 ip->ip_off = htons(ip->ip_off);
346 ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
348 ip = mtod(m, struct ip *);
353 /* IP-in-IP encapsulation */
354 if (prot == IPPROTO_IPIP) {
357 if (m->m_pkthdr.len - skip < sizeof(struct ip)) {
358 IPSEC_ISTAT(sproto, V_espstat.esps_hdrops,
360 V_ipcompstat.ipcomps_hdrops);
364 /* ipn will now contain the inner IPv4 header */
365 m_copydata(m, ip->ip_hl << 2, sizeof(struct ip),
368 /* XXX PROXY address isn't recorded in SAH */
370 * Check that the inner source address is the same as
371 * the proxy address, if available.
373 if ((saidx->proxy.sa.sa_family == AF_INET &&
374 saidx->proxy.sin.sin_addr.s_addr !=
377 saidx->proxy.sin.sin_addr.s_addr) ||
378 (saidx->proxy.sa.sa_family != AF_INET &&
379 saidx->proxy.sa.sa_family != 0)) {
381 DPRINTF(("%s: inner source address %s doesn't "
382 "correspond to expected proxy source %s, "
383 "SA %s/%08lx\n", __func__,
384 inet_ntoa4(ipn.ip_src),
385 ipsp_address(saidx->proxy),
386 ipsp_address(saidx->dst),
387 (u_long) ntohl(sav->spi)));
389 IPSEC_ISTAT(sproto, V_espstat.esps_pdrops,
391 V_ipcompstat.ipcomps_pdrops);
397 /* IPv6-in-IP encapsulation. */
398 if (prot == IPPROTO_IPV6) {
401 if (m->m_pkthdr.len - skip < sizeof(struct ip6_hdr)) {
402 IPSEC_ISTAT(sproto, V_espstat.esps_hdrops,
404 V_ipcompstat.ipcomps_hdrops);
408 /* ip6n will now contain the inner IPv6 header. */
409 m_copydata(m, ip->ip_hl << 2, sizeof(struct ip6_hdr),
413 * Check that the inner source address is the same as
414 * the proxy address, if available.
416 if ((saidx->proxy.sa.sa_family == AF_INET6 &&
417 !IN6_IS_ADDR_UNSPECIFIED(&saidx->proxy.sin6.sin6_addr) &&
418 !IN6_ARE_ADDR_EQUAL(&ip6n.ip6_src,
419 &saidx->proxy.sin6.sin6_addr)) ||
420 (saidx->proxy.sa.sa_family != AF_INET6 &&
421 saidx->proxy.sa.sa_family != 0)) {
423 DPRINTF(("%s: inner source address %s doesn't "
424 "correspond to expected proxy source %s, "
425 "SA %s/%08lx\n", __func__,
426 ip6_sprintf(ip6buf, &ip6n.ip6_src),
427 ipsec_address(&saidx->proxy),
428 ipsec_address(&saidx->dst),
429 (u_long) ntohl(sav->spi)));
431 IPSEC_ISTAT(sproto, V_espstat.esps_pdrops,
433 V_ipcompstat.ipcomps_pdrops);
442 * Record what we've done to the packet (under what SA it was
443 * processed). If we've been passed an mtag, it means the packet
444 * was already processed by an ethernet/crypto combo card and
445 * thus has a tag attached with all the right information, but
446 * with a PACKET_TAG_IPSEC_IN_CRYPTO_DONE as opposed to
447 * PACKET_TAG_IPSEC_IN_DONE type; in that case, just change the type.
449 if (mt == NULL && sproto != IPPROTO_IPCOMP) {
450 mtag = m_tag_get(PACKET_TAG_IPSEC_IN_DONE,
451 sizeof(struct tdb_ident), M_NOWAIT);
453 DPRINTF(("%s: failed to get tag\n", __func__));
454 IPSEC_ISTAT(sproto, V_espstat.esps_hdrops,
455 V_ahstat.ahs_hdrops, V_ipcompstat.ipcomps_hdrops);
460 tdbi = (struct tdb_ident *)(mtag + 1);
461 bcopy(&saidx->dst, &tdbi->dst, saidx->dst.sa.sa_len);
462 tdbi->proto = sproto;
463 tdbi->spi = sav->spi;
464 /* Cache those two for enc(4) in xform_ipip. */
465 tdbi->alg_auth = sav->alg_auth;
466 tdbi->alg_enc = sav->alg_enc;
468 m_tag_prepend(m, mtag);
469 } else if (mt != NULL) {
470 mt->m_tag_id = PACKET_TAG_IPSEC_IN_DONE;
471 /* XXX do we need to mark m_flags??? */
474 key_sa_recordxfer(sav, m); /* record data transfer */
477 encif->if_ipackets++;
478 encif->if_ibytes += m->m_pkthdr.len;
481 * Pass the mbuf to enc0 for bpf and pfil. We will filter the IPIP
482 * packet later after it has been decapsulated.
484 ipsec_bpf(m, sav, AF_INET, ENC_IN|ENC_BEFORE);
486 if (prot != IPPROTO_IPIP)
487 if ((error = ipsec_filter(&m, PFIL_IN, ENC_IN|ENC_BEFORE)) != 0)
492 * Re-dispatch via software interrupt.
494 if ((error = netisr_queue_src(NETISR_IP, (uintptr_t)sav->spi, m))) {
495 IPSEC_ISTAT(sproto, V_espstat.esps_qfull, V_ahstat.ahs_qfull,
496 V_ipcompstat.ipcomps_qfull);
498 DPRINTF(("%s: queue full; proto %u packet dropped\n",
509 ipsec4_common_ctlinput(int cmd, struct sockaddr *sa, void *v, int proto)
511 /* XXX nothing just yet */
516 /* IPv6 AH wrapper. */
518 ipsec6_common_input(struct mbuf **mp, int *offp, int proto)
524 if (*offp < sizeof(struct ip6_hdr)) {
525 DPRINTF(("%s: bad offset %u\n", __func__, *offp));
527 } else if (*offp == sizeof(struct ip6_hdr)) {
528 protoff = offsetof(struct ip6_hdr, ip6_nxt);
530 /* Chase down the header chain... */
531 protoff = sizeof(struct ip6_hdr);
535 m_copydata(*mp, protoff, sizeof(ip6e),
538 if (ip6e.ip6e_nxt == IPPROTO_AH)
539 l = (ip6e.ip6e_len + 2) << 2;
541 l = (ip6e.ip6e_len + 1) << 3;
542 IPSEC_ASSERT(l > 0, ("l went zero or negative"));
543 } while (protoff + l < *offp);
545 /* Malformed packet check */
546 if (protoff + l != *offp) {
547 DPRINTF(("%s: bad packet header chain, protoff %u, "
548 "l %u, off %u\n", __func__, protoff, l, *offp));
549 IPSEC_ISTAT(proto, V_espstat.esps_hdrops,
551 V_ipcompstat.ipcomps_hdrops);
556 protoff += offsetof(struct ip6_ext, ip6e_nxt);
558 (void) ipsec_common_input(*mp, *offp, protoff, AF_INET6, proto);
563 * IPsec input callback, called by the transform callback. Takes care of
564 * filtering and other sanity checks on the processed packet.
567 ipsec6_common_input_cb(struct mbuf *m, struct secasvar *sav, int skip, int protoff,
570 int prot, af, sproto;
573 struct tdb_ident *tdbi;
574 struct secasindex *saidx;
579 char ip6buf[INET6_ADDRSTRLEN];
582 IPSEC_ASSERT(m != NULL, ("null mbuf"));
583 IPSEC_ASSERT(sav != NULL, ("null SA"));
584 IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
585 saidx = &sav->sah->saidx;
586 af = saidx->dst.sa.sa_family;
587 IPSEC_ASSERT(af == AF_INET6, ("unexpected af %u", af));
588 sproto = saidx->proto;
589 IPSEC_ASSERT(sproto == IPPROTO_ESP || sproto == IPPROTO_AH ||
590 sproto == IPPROTO_IPCOMP,
591 ("unexpected security protocol %u", sproto));
595 DPRINTF(("%s: null mbuf", __func__));
596 IPSEC_ISTAT(sproto, V_espstat.esps_badkcr, V_ahstat.ahs_badkcr,
597 V_ipcompstat.ipcomps_badkcr);
602 /* Fix IPv6 header */
603 if (m->m_len < sizeof(struct ip6_hdr) &&
604 (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
606 DPRINTF(("%s: processing failed for SA %s/%08lx\n",
607 __func__, ipsec_address(&sav->sah->saidx.dst),
608 (u_long) ntohl(sav->spi)));
610 IPSEC_ISTAT(sproto, V_espstat.esps_hdrops, V_ahstat.ahs_hdrops,
611 V_ipcompstat.ipcomps_hdrops);
616 ip6 = mtod(m, struct ip6_hdr *);
617 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
620 m_copydata(m, protoff, 1, (unsigned char *) &prot);
624 /* IP-in-IP encapsulation */
625 if (prot == IPPROTO_IPIP) {
628 if (m->m_pkthdr.len - skip < sizeof(struct ip)) {
629 IPSEC_ISTAT(sproto, V_espstat.esps_hdrops,
631 V_ipcompstat.ipcomps_hdrops);
635 /* ipn will now contain the inner IPv4 header */
636 m_copydata(m, skip, sizeof(struct ip), (caddr_t) &ipn);
639 * Check that the inner source address is the same as
640 * the proxy address, if available.
642 if ((saidx->proxy.sa.sa_family == AF_INET &&
643 saidx->proxy.sin.sin_addr.s_addr != INADDR_ANY &&
644 ipn.ip_src.s_addr != saidx->proxy.sin.sin_addr.s_addr) ||
645 (saidx->proxy.sa.sa_family != AF_INET &&
646 saidx->proxy.sa.sa_family != 0)) {
648 DPRINTF(("%s: inner source address %s doesn't "
649 "correspond to expected proxy source %s, "
650 "SA %s/%08lx\n", __func__,
651 inet_ntoa4(ipn.ip_src),
652 ipsec_address(&saidx->proxy),
653 ipsec_address(&saidx->dst),
654 (u_long) ntohl(sav->spi)));
656 IPSEC_ISTATsproto, (V_espstat.esps_pdrops,
657 V_ahstat.ahs_pdrops, V_ipcompstat.ipcomps_pdrops);
664 /* IPv6-in-IP encapsulation */
665 if (prot == IPPROTO_IPV6) {
668 if (m->m_pkthdr.len - skip < sizeof(struct ip6_hdr)) {
669 IPSEC_ISTAT(sproto, V_espstat.esps_hdrops,
671 V_ipcompstat.ipcomps_hdrops);
675 /* ip6n will now contain the inner IPv6 header. */
676 m_copydata(m, skip, sizeof(struct ip6_hdr),
680 * Check that the inner source address is the same as
681 * the proxy address, if available.
683 if ((saidx->proxy.sa.sa_family == AF_INET6 &&
684 !IN6_IS_ADDR_UNSPECIFIED(&saidx->proxy.sin6.sin6_addr) &&
685 !IN6_ARE_ADDR_EQUAL(&ip6n.ip6_src,
686 &saidx->proxy.sin6.sin6_addr)) ||
687 (saidx->proxy.sa.sa_family != AF_INET6 &&
688 saidx->proxy.sa.sa_family != 0)) {
690 DPRINTF(("%s: inner source address %s doesn't "
691 "correspond to expected proxy source %s, "
692 "SA %s/%08lx\n", __func__,
693 ip6_sprintf(ip6buf, &ip6n.ip6_src),
694 ipsec_address(&saidx->proxy),
695 ipsec_address(&saidx->dst),
696 (u_long) ntohl(sav->spi)));
698 IPSEC_ISTAT(sproto, V_espstat.esps_pdrops,
699 V_ahstat.ahs_pdrops, V_ipcompstat.ipcomps_pdrops);
707 * Record what we've done to the packet (under what SA it was
708 * processed). If we've been passed an mtag, it means the packet
709 * was already processed by an ethernet/crypto combo card and
710 * thus has a tag attached with all the right information, but
711 * with a PACKET_TAG_IPSEC_IN_CRYPTO_DONE as opposed to
712 * PACKET_TAG_IPSEC_IN_DONE type; in that case, just change the type.
714 if (mt == NULL && sproto != IPPROTO_IPCOMP) {
715 mtag = m_tag_get(PACKET_TAG_IPSEC_IN_DONE,
716 sizeof(struct tdb_ident), M_NOWAIT);
718 DPRINTF(("%s: failed to get tag\n", __func__));
719 IPSEC_ISTAT(sproto, V_espstat.esps_hdrops,
720 V_ahstat.ahs_hdrops, V_ipcompstat.ipcomps_hdrops);
725 tdbi = (struct tdb_ident *)(mtag + 1);
726 bcopy(&saidx->dst, &tdbi->dst, sizeof(union sockaddr_union));
727 tdbi->proto = sproto;
728 tdbi->spi = sav->spi;
729 /* Cache those two for enc(4) in xform_ipip. */
730 tdbi->alg_auth = sav->alg_auth;
731 tdbi->alg_enc = sav->alg_enc;
733 m_tag_prepend(m, mtag);
736 mt->m_tag_id = PACKET_TAG_IPSEC_IN_DONE;
737 /* XXX do we need to mark m_flags??? */
740 key_sa_recordxfer(sav, m);
743 encif->if_ipackets++;
744 encif->if_ibytes += m->m_pkthdr.len;
747 * Pass the mbuf to enc0 for bpf and pfil. We will filter the IPIP
748 * packet later after it has been decapsulated.
750 ipsec_bpf(m, sav, AF_INET6, ENC_IN|ENC_BEFORE);
752 /* XXX-BZ does not make sense. */
753 if (prot != IPPROTO_IPIP)
754 if ((error = ipsec_filter(&m, PFIL_IN, ENC_IN|ENC_BEFORE)) != 0)
758 /* Retrieve new protocol */
759 m_copydata(m, protoff, sizeof(u_int8_t), (caddr_t) &nxt8);
762 * See the end of ip6_input for this logic.
763 * IPPROTO_IPV[46] case will be processed just like other ones
767 while (nxt != IPPROTO_DONE) {
768 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
769 V_ip6stat.ip6s_toomanyhdr++;
775 * Protection against faulty packet - there should be
776 * more sanity checks in header chain processing.
778 if (m->m_pkthdr.len < skip) {
779 V_ip6stat.ip6s_tooshort++;
780 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
785 * Enforce IPsec policy checking if we are seeing last header.
786 * note that we do not visit this with protocols with pcb layer
787 * code - like udp/tcp/raw ip.
789 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
790 ipsec6_in_reject(m, NULL)) {
794 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &skip, nxt);
804 esp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
806 struct ip6ctlparam *ip6cp = NULL;
807 struct mbuf *m = NULL;
811 if (sa->sa_family != AF_INET6 ||
812 sa->sa_len != sizeof(struct sockaddr_in6))
814 if ((unsigned)cmd >= PRC_NCMDS)
817 /* if the parameter is from icmp6, decode it. */
819 ip6cp = (struct ip6ctlparam *)d;
821 ip6 = ip6cp->ip6c_ip6;
822 off = ip6cp->ip6c_off;
826 off = 0; /* calm gcc */
831 struct ip6ctlparam ip6cp1;
834 * Notify the error to all possible sockets via pfctlinput2.
835 * Since the upper layer information (such as protocol type,
836 * source and destination ports) is embedded in the encrypted
837 * data and might have been cut, we can't directly call
838 * an upper layer ctlinput function. However, the pcbnotify
839 * function will consider source and destination addresses
840 * as well as the flow info value, and may be able to find
841 * some PCB that should be notified.
842 * Although pfctlinput2 will call esp6_ctlinput(), there is
843 * no possibility of an infinite loop of function calls,
844 * because we don't pass the inner IPv6 header.
846 bzero(&ip6cp1, sizeof(ip6cp1));
847 ip6cp1.ip6c_src = ip6cp->ip6c_src;
848 pfctlinput2(cmd, sa, (void *)&ip6cp1);
851 * Then go to special cases that need ESP header information.
852 * XXX: We assume that when ip6 is non NULL,
853 * M and OFF are valid.
856 if (cmd == PRC_MSGSIZE) {
857 struct secasvar *sav;
861 /* check header length before using m_copydata */
862 if (m->m_pkthdr.len < off + sizeof (struct esp))
864 m_copydata(m, off + offsetof(struct esp, esp_spi),
865 sizeof(u_int32_t), (caddr_t) &spi);
867 * Check to see if we have a valid SA corresponding to
868 * the address in the ICMP message payload.
870 sav = KEY_ALLOCSA((union sockaddr_union *)sa,
872 valid = (sav != NULL);
876 /* XXX Further validation? */
879 * Depending on whether the SA is "valid" and
880 * routing table size (mtudisc_{hi,lo}wat), we will:
881 * - recalcurate the new MTU and create the
882 * corresponding routing entry, or
883 * - ignore the MTU change notification.
885 icmp6_mtudisc_update(ip6cp, valid);
888 /* we normally notify any pcb here */