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>
59 #include <net/if_var.h>
61 #include <net/route.h>
62 #include <net/netisr.h>
65 #include <netinet/in.h>
66 #include <netinet/in_systm.h>
67 #include <netinet/ip.h>
68 #include <netinet/ip_var.h>
69 #include <netinet/in_var.h>
71 #include <netinet/ip6.h>
73 #include <netinet6/ip6_var.h>
75 #include <netinet/in_pcb.h>
77 #include <netinet/icmp6.h>
80 #include <netipsec/ipsec.h>
82 #include <netipsec/ipsec6.h>
84 #include <netipsec/ah_var.h>
85 #include <netipsec/esp.h>
86 #include <netipsec/esp_var.h>
87 #include <netipsec/ipcomp_var.h>
89 #include <netipsec/key.h>
90 #include <netipsec/keydb.h>
92 #include <netipsec/xform.h>
93 #include <netinet6/ip6protosw.h>
95 #include <machine/in_cksum.h>
96 #include <machine/stdarg.h>
99 #include <net/if_enc.h>
103 #define IPSEC_ISTAT(proto, name) do { \
104 if ((proto) == IPPROTO_ESP) \
105 ESPSTAT_INC(esps_##name); \
106 else if ((proto) == IPPROTO_AH) \
107 AHSTAT_INC(ahs_##name); \
109 IPCOMPSTAT_INC(ipcomps_##name); \
113 static void ipsec4_common_ctlinput(int, struct sockaddr *, void *, int);
117 * ipsec_common_input gets called when an IPsec-protected packet
118 * is received by IPv4 or IPv6. Its job is to find the right SA
119 * and call the appropriate transform. The transform callback
120 * takes care of further processing (like ingress filtering).
123 ipsec_common_input(struct mbuf *m, int skip, int protoff, int af, int sproto)
125 union sockaddr_union dst_address;
126 struct secasvar *sav;
135 IPSEC_ISTAT(sproto, input);
137 IPSEC_ASSERT(m != NULL, ("null packet"));
139 IPSEC_ASSERT(sproto == IPPROTO_ESP || sproto == IPPROTO_AH ||
140 sproto == IPPROTO_IPCOMP,
141 ("unexpected security protocol %u", sproto));
143 if ((sproto == IPPROTO_ESP && !V_esp_enable) ||
144 (sproto == IPPROTO_AH && !V_ah_enable) ||
145 (sproto == IPPROTO_IPCOMP && !V_ipcomp_enable)) {
147 IPSEC_ISTAT(sproto, pdrops);
151 if (m->m_pkthdr.len - skip < 2 * sizeof (u_int32_t)) {
153 IPSEC_ISTAT(sproto, hdrops);
154 DPRINTF(("%s: packet too small\n", __func__));
158 /* Retrieve the SPI from the relevant IPsec header */
159 if (sproto == IPPROTO_ESP)
160 m_copydata(m, skip, sizeof(u_int32_t), (caddr_t) &spi);
161 else if (sproto == IPPROTO_AH)
162 m_copydata(m, skip + sizeof(u_int32_t), sizeof(u_int32_t),
164 else if (sproto == IPPROTO_IPCOMP) {
166 m_copydata(m, skip + sizeof(u_int16_t), sizeof(u_int16_t),
168 spi = ntohl(htons(cpi));
172 * Find the SA and (indirectly) call the appropriate
173 * kernel crypto routine. The resulting mbuf chain is a valid
174 * IP packet ready to go through input processing.
176 bzero(&dst_address, sizeof (dst_address));
177 dst_address.sa.sa_family = af;
181 dst_address.sin.sin_len = sizeof(struct sockaddr_in);
182 m_copydata(m, offsetof(struct ip, ip_dst),
183 sizeof(struct in_addr),
184 (caddr_t) &dst_address.sin.sin_addr);
186 /* Find the source port for NAT-T; see udp*_espdecap. */
187 tag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS, NULL);
189 dst_address.sin.sin_port = ((u_int16_t *)(tag + 1))[1];
190 #endif /* IPSEC_NAT_T */
195 dst_address.sin6.sin6_len = sizeof(struct sockaddr_in6);
196 m_copydata(m, offsetof(struct ip6_hdr, ip6_dst),
197 sizeof(struct in6_addr),
198 (caddr_t) &dst_address.sin6.sin6_addr);
202 DPRINTF(("%s: unsupported protocol family %u\n", __func__, af));
204 IPSEC_ISTAT(sproto, nopf);
208 /* NB: only pass dst since key_allocsa follows RFC2401 */
209 sav = KEY_ALLOCSA(&dst_address, sproto, spi);
211 DPRINTF(("%s: no key association found for SA %s/%08lx/%u\n",
212 __func__, ipsec_address(&dst_address),
213 (u_long) ntohl(spi), sproto));
214 IPSEC_ISTAT(sproto, notdb);
219 if (sav->tdb_xform == NULL) {
220 DPRINTF(("%s: attempted to use uninitialized SA %s/%08lx/%u\n",
221 __func__, ipsec_address(&dst_address),
222 (u_long) ntohl(spi), sproto));
223 IPSEC_ISTAT(sproto, noxform);
230 * Call appropriate transform and return -- callback takes care of
233 error = (*sav->tdb_xform->xf_input)(m, sav, skip, protoff);
240 * Common input handler for IPv4 AH, ESP, and IPCOMP.
243 ipsec4_common_input(struct mbuf *m, ...)
249 off = va_arg(ap, int);
250 nxt = va_arg(ap, int);
253 return ipsec_common_input(m, off, offsetof(struct ip, ip_p),
258 ah4_input(struct mbuf **mp, int *offp, int proto)
267 ipsec4_common_input(m, off, IPPROTO_AH);
268 return (IPPROTO_DONE);
271 ah4_ctlinput(int cmd, struct sockaddr *sa, void *v)
273 if (sa->sa_family == AF_INET &&
274 sa->sa_len == sizeof(struct sockaddr_in))
275 ipsec4_common_ctlinput(cmd, sa, v, IPPROTO_AH);
279 esp4_input(struct mbuf **mp, int *offp, int proto)
288 ipsec4_common_input(m, off, IPPROTO_ESP);
289 return (IPPROTO_DONE);
293 esp4_ctlinput(int cmd, struct sockaddr *sa, void *v)
295 if (sa->sa_family == AF_INET &&
296 sa->sa_len == sizeof(struct sockaddr_in))
297 ipsec4_common_ctlinput(cmd, sa, v, IPPROTO_ESP);
301 ipcomp4_input(struct mbuf **mp, int *offp, int proto)
310 ipsec4_common_input(m, off, IPPROTO_IPCOMP);
311 return (IPPROTO_DONE);
315 * IPsec input callback for INET protocols.
316 * This routine is called as the transform callback.
317 * Takes care of filtering and other sanity checks on
318 * the processed packet.
321 ipsec4_common_input_cb(struct mbuf *m, struct secasvar *sav,
322 int skip, int protoff, struct m_tag *mt)
324 int prot, af, sproto, isr_prot;
327 struct tdb_ident *tdbi;
328 struct secasindex *saidx;
332 char ip6buf[INET6_ADDRSTRLEN];
336 IPSEC_ASSERT(m != NULL, ("null mbuf"));
337 IPSEC_ASSERT(sav != NULL, ("null SA"));
338 IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
339 saidx = &sav->sah->saidx;
340 af = saidx->dst.sa.sa_family;
341 IPSEC_ASSERT(af == AF_INET, ("unexpected af %u", af));
342 sproto = saidx->proto;
343 IPSEC_ASSERT(sproto == IPPROTO_ESP || sproto == IPPROTO_AH ||
344 sproto == IPPROTO_IPCOMP,
345 ("unexpected security protocol %u", sproto));
349 DPRINTF(("%s: null mbuf", __func__));
350 IPSEC_ISTAT(sproto, badkcr);
358 * XXXGL: do we need this entire block?
360 if (m->m_len < skip && (m = m_pullup(m, skip)) == NULL) {
361 DPRINTF(("%s: processing failed for SA %s/%08lx\n",
362 __func__, ipsec_address(&sav->sah->saidx.dst),
363 (u_long) ntohl(sav->spi)));
364 IPSEC_ISTAT(sproto, hdrops);
369 ip = mtod(m, struct ip *);
370 ip->ip_len = htons(m->m_pkthdr.len);
372 ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
374 ip = mtod(m, struct ip *);
379 encif->if_ipackets++;
380 encif->if_ibytes += m->m_pkthdr.len;
383 * Pass the mbuf to enc0 for bpf and pfil. We will filter the IPIP
384 * packet later after it has been decapsulated.
386 ipsec_bpf(m, sav, AF_INET, ENC_IN|ENC_BEFORE);
388 if (prot != IPPROTO_IPIP)
389 if ((error = ipsec_filter(&m, PFIL_IN, ENC_IN|ENC_BEFORE)) != 0)
393 /* IP-in-IP encapsulation */
394 if (prot == IPPROTO_IPIP) {
396 if (m->m_pkthdr.len - skip < sizeof(struct ip)) {
397 IPSEC_ISTAT(sproto, hdrops);
401 /* enc0: strip outer IPv4 header */
402 m_striphdr(m, 0, ip->ip_hl << 2);
405 /* XXX PROXY address isn't recorded in SAH */
407 * Check that the inner source address is the same as
408 * the proxy address, if available.
410 if ((saidx->proxy.sa.sa_family == AF_INET &&
411 saidx->proxy.sin.sin_addr.s_addr !=
414 saidx->proxy.sin.sin_addr.s_addr) ||
415 (saidx->proxy.sa.sa_family != AF_INET &&
416 saidx->proxy.sa.sa_family != 0)) {
418 DPRINTF(("%s: inner source address %s doesn't "
419 "correspond to expected proxy source %s, "
420 "SA %s/%08lx\n", __func__,
421 inet_ntoa4(ipn.ip_src),
422 ipsp_address(saidx->proxy),
423 ipsp_address(saidx->dst),
424 (u_long) ntohl(sav->spi)));
426 IPSEC_ISTAT(sproto, pdrops);
433 /* IPv6-in-IP encapsulation. */
434 if (prot == IPPROTO_IPV6) {
436 if (m->m_pkthdr.len - skip < sizeof(struct ip6_hdr)) {
437 IPSEC_ISTAT(sproto, hdrops);
441 /* enc0: strip IPv4 header, keep IPv6 header only */
442 m_striphdr(m, 0, ip->ip_hl << 2);
445 * Check that the inner source address is the same as
446 * the proxy address, if available.
448 if ((saidx->proxy.sa.sa_family == AF_INET6 &&
449 !IN6_IS_ADDR_UNSPECIFIED(&saidx->proxy.sin6.sin6_addr) &&
450 !IN6_ARE_ADDR_EQUAL(&ip6n.ip6_src,
451 &saidx->proxy.sin6.sin6_addr)) ||
452 (saidx->proxy.sa.sa_family != AF_INET6 &&
453 saidx->proxy.sa.sa_family != 0)) {
455 DPRINTF(("%s: inner source address %s doesn't "
456 "correspond to expected proxy source %s, "
457 "SA %s/%08lx\n", __func__,
458 ip6_sprintf(ip6buf, &ip6n.ip6_src),
459 ipsec_address(&saidx->proxy),
460 ipsec_address(&saidx->dst),
461 (u_long) ntohl(sav->spi)));
463 IPSEC_ISTAT(sproto, pdrops);
472 * Record what we've done to the packet (under what SA it was
473 * processed). If we've been passed an mtag, it means the packet
474 * was already processed by an ethernet/crypto combo card and
475 * thus has a tag attached with all the right information, but
476 * with a PACKET_TAG_IPSEC_IN_CRYPTO_DONE as opposed to
477 * PACKET_TAG_IPSEC_IN_DONE type; in that case, just change the type.
479 if (mt == NULL && sproto != IPPROTO_IPCOMP) {
480 mtag = m_tag_get(PACKET_TAG_IPSEC_IN_DONE,
481 sizeof(struct tdb_ident), M_NOWAIT);
483 DPRINTF(("%s: failed to get tag\n", __func__));
484 IPSEC_ISTAT(sproto, hdrops);
489 tdbi = (struct tdb_ident *)(mtag + 1);
490 bcopy(&saidx->dst, &tdbi->dst, saidx->dst.sa.sa_len);
491 tdbi->proto = sproto;
492 tdbi->spi = sav->spi;
493 /* Cache those two for enc(4) in xform_ipip. */
494 tdbi->alg_auth = sav->alg_auth;
495 tdbi->alg_enc = sav->alg_enc;
497 m_tag_prepend(m, mtag);
498 } else if (mt != NULL) {
499 mt->m_tag_id = PACKET_TAG_IPSEC_IN_DONE;
500 /* XXX do we need to mark m_flags??? */
503 key_sa_recordxfer(sav, m); /* record data transfer */
507 * Pass the mbuf to enc0 for bpf and pfil.
509 if (prot == IPPROTO_IPIP)
510 ipsec_bpf(m, sav, AF_INET, ENC_IN|ENC_AFTER);
512 if (prot == IPPROTO_IPV6)
513 ipsec_bpf(m, sav, AF_INET6, ENC_IN|ENC_AFTER);
516 if ((error = ipsec_filter(&m, PFIL_IN, ENC_IN|ENC_AFTER)) != 0)
521 * Re-dispatch via software interrupt.
526 isr_prot = NETISR_IP;
530 isr_prot = NETISR_IPV6;
534 DPRINTF(("%s: cannot handle inner ip proto %d\n",
536 IPSEC_ISTAT(sproto, nopf);
537 error = EPFNOSUPPORT;
541 error = netisr_queue_src(isr_prot, (uintptr_t)sav->spi, m);
543 IPSEC_ISTAT(sproto, qfull);
544 DPRINTF(("%s: queue full; proto %u packet dropped\n",
555 ipsec4_common_ctlinput(int cmd, struct sockaddr *sa, void *v, int proto)
557 /* XXX nothing just yet */
562 /* IPv6 AH wrapper. */
564 ipsec6_common_input(struct mbuf **mp, int *offp, int proto)
570 if (*offp < sizeof(struct ip6_hdr)) {
571 DPRINTF(("%s: bad offset %u\n", __func__, *offp));
573 } else if (*offp == sizeof(struct ip6_hdr)) {
574 protoff = offsetof(struct ip6_hdr, ip6_nxt);
576 /* Chase down the header chain... */
577 protoff = sizeof(struct ip6_hdr);
581 m_copydata(*mp, protoff, sizeof(ip6e),
584 if (ip6e.ip6e_nxt == IPPROTO_AH)
585 l = (ip6e.ip6e_len + 2) << 2;
587 l = (ip6e.ip6e_len + 1) << 3;
588 IPSEC_ASSERT(l > 0, ("l went zero or negative"));
589 } while (protoff + l < *offp);
591 /* Malformed packet check */
592 if (protoff + l != *offp) {
593 DPRINTF(("%s: bad packet header chain, protoff %u, "
594 "l %u, off %u\n", __func__, protoff, l, *offp));
595 IPSEC_ISTAT(proto, hdrops);
600 protoff += offsetof(struct ip6_ext, ip6e_nxt);
602 (void) ipsec_common_input(*mp, *offp, protoff, AF_INET6, proto);
607 * IPsec input callback, called by the transform callback. Takes care of
608 * filtering and other sanity checks on the processed packet.
611 ipsec6_common_input_cb(struct mbuf *m, struct secasvar *sav, int skip, int protoff,
614 int prot, af, sproto;
617 struct tdb_ident *tdbi;
618 struct secasindex *saidx;
623 char ip6buf[INET6_ADDRSTRLEN];
626 IPSEC_ASSERT(m != NULL, ("null mbuf"));
627 IPSEC_ASSERT(sav != NULL, ("null SA"));
628 IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
629 saidx = &sav->sah->saidx;
630 af = saidx->dst.sa.sa_family;
631 IPSEC_ASSERT(af == AF_INET6, ("unexpected af %u", af));
632 sproto = saidx->proto;
633 IPSEC_ASSERT(sproto == IPPROTO_ESP || sproto == IPPROTO_AH ||
634 sproto == IPPROTO_IPCOMP,
635 ("unexpected security protocol %u", sproto));
639 DPRINTF(("%s: null mbuf", __func__));
640 IPSEC_ISTAT(sproto, badkcr);
645 /* Fix IPv6 header */
646 if (m->m_len < sizeof(struct ip6_hdr) &&
647 (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
649 DPRINTF(("%s: processing failed for SA %s/%08lx\n",
650 __func__, ipsec_address(&sav->sah->saidx.dst),
651 (u_long) ntohl(sav->spi)));
653 IPSEC_ISTAT(sproto, hdrops);
658 ip6 = mtod(m, struct ip6_hdr *);
659 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
663 m_copydata(m, protoff, 1, (unsigned char *) &prot);
666 encif->if_ipackets++;
667 encif->if_ibytes += m->m_pkthdr.len;
670 * Pass the mbuf to enc0 for bpf and pfil. We will filter the IPIP
671 * packet later after it has been decapsulated.
673 ipsec_bpf(m, sav, AF_INET6, ENC_IN|ENC_BEFORE);
675 /* XXX-BZ does not make sense. */
676 if (prot != IPPROTO_IPIP)
677 if ((error = ipsec_filter(&m, PFIL_IN, ENC_IN|ENC_BEFORE)) != 0)
682 /* IP-in-IP encapsulation */
683 if (prot == IPPROTO_IPIP) {
684 if (m->m_pkthdr.len - skip < sizeof(struct ip)) {
685 IPSEC_ISTAT(sproto, hdrops);
689 /* ipn will now contain the inner IPv4 header */
690 m_striphdr(m, 0, skip);
694 * Check that the inner source address is the same as
695 * the proxy address, if available.
697 if ((saidx->proxy.sa.sa_family == AF_INET &&
698 saidx->proxy.sin.sin_addr.s_addr != INADDR_ANY &&
699 ipn.ip_src.s_addr != saidx->proxy.sin.sin_addr.s_addr) ||
700 (saidx->proxy.sa.sa_family != AF_INET &&
701 saidx->proxy.sa.sa_family != 0)) {
703 DPRINTF(("%s: inner source address %s doesn't "
704 "correspond to expected proxy source %s, "
705 "SA %s/%08lx\n", __func__,
706 inet_ntoa4(ipn.ip_src),
707 ipsec_address(&saidx->proxy),
708 ipsec_address(&saidx->dst),
709 (u_long) ntohl(sav->spi)));
711 IPSEC_ISTAT(sproto, pdrops);
718 /* IPv6-in-IP encapsulation */
719 if (prot == IPPROTO_IPV6) {
720 if (m->m_pkthdr.len - skip < sizeof(struct ip6_hdr)) {
721 IPSEC_ISTAT(sproto, hdrops);
725 /* ip6n will now contain the inner IPv6 header. */
726 m_striphdr(m, 0, skip);
730 * Check that the inner source address is the same as
731 * the proxy address, if available.
733 if ((saidx->proxy.sa.sa_family == AF_INET6 &&
734 !IN6_IS_ADDR_UNSPECIFIED(&saidx->proxy.sin6.sin6_addr) &&
735 !IN6_ARE_ADDR_EQUAL(&ip6n.ip6_src,
736 &saidx->proxy.sin6.sin6_addr)) ||
737 (saidx->proxy.sa.sa_family != AF_INET6 &&
738 saidx->proxy.sa.sa_family != 0)) {
740 DPRINTF(("%s: inner source address %s doesn't "
741 "correspond to expected proxy source %s, "
742 "SA %s/%08lx\n", __func__,
743 ip6_sprintf(ip6buf, &ip6n.ip6_src),
744 ipsec_address(&saidx->proxy),
745 ipsec_address(&saidx->dst),
746 (u_long) ntohl(sav->spi)));
748 IPSEC_ISTAT(sproto, pdrops);
756 * Record what we've done to the packet (under what SA it was
757 * processed). If we've been passed an mtag, it means the packet
758 * was already processed by an ethernet/crypto combo card and
759 * thus has a tag attached with all the right information, but
760 * with a PACKET_TAG_IPSEC_IN_CRYPTO_DONE as opposed to
761 * PACKET_TAG_IPSEC_IN_DONE type; in that case, just change the type.
763 if (mt == NULL && sproto != IPPROTO_IPCOMP) {
764 mtag = m_tag_get(PACKET_TAG_IPSEC_IN_DONE,
765 sizeof(struct tdb_ident), M_NOWAIT);
767 DPRINTF(("%s: failed to get tag\n", __func__));
768 IPSEC_ISTAT(sproto, hdrops);
773 tdbi = (struct tdb_ident *)(mtag + 1);
774 bcopy(&saidx->dst, &tdbi->dst, sizeof(union sockaddr_union));
775 tdbi->proto = sproto;
776 tdbi->spi = sav->spi;
777 /* Cache those two for enc(4) in xform_ipip. */
778 tdbi->alg_auth = sav->alg_auth;
779 tdbi->alg_enc = sav->alg_enc;
781 m_tag_prepend(m, mtag);
784 mt->m_tag_id = PACKET_TAG_IPSEC_IN_DONE;
785 /* XXX do we need to mark m_flags??? */
788 key_sa_recordxfer(sav, m);
792 * Pass the mbuf to enc0 for bpf and pfil.
795 if (prot == IPPROTO_IPIP)
796 ipsec_bpf(m, sav, AF_INET, ENC_IN|ENC_AFTER);
798 if (prot == IPPROTO_IPV6)
799 ipsec_bpf(m, sav, AF_INET6, ENC_IN|ENC_AFTER);
801 if ((error = ipsec_filter(&m, PFIL_IN, ENC_IN|ENC_AFTER)) != 0)
804 /* Retrieve new protocol */
805 /* We have stripped the IP6 header from the mbuf, we have to use the backuped proto value instead */
809 * See the end of ip6_input for this logic.
810 * IPPROTO_IPV[46] case will be processed just like other ones
814 while (nxt != IPPROTO_DONE) {
815 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
816 IP6STAT_INC(ip6s_toomanyhdr);
822 * Protection against faulty packet - there should be
823 * more sanity checks in header chain processing.
825 if (m->m_pkthdr.len < skip) {
826 IP6STAT_INC(ip6s_tooshort);
827 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
832 * Enforce IPsec policy checking if we are seeing last header.
833 * note that we do not visit this with protocols with pcb layer
834 * code - like udp/tcp/raw ip.
836 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
837 ipsec6_in_reject(m, NULL)) {
841 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &skip, nxt);
851 esp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
853 struct ip6ctlparam *ip6cp = NULL;
854 struct mbuf *m = NULL;
858 if (sa->sa_family != AF_INET6 ||
859 sa->sa_len != sizeof(struct sockaddr_in6))
861 if ((unsigned)cmd >= PRC_NCMDS)
864 /* if the parameter is from icmp6, decode it. */
866 ip6cp = (struct ip6ctlparam *)d;
868 ip6 = ip6cp->ip6c_ip6;
869 off = ip6cp->ip6c_off;
873 off = 0; /* calm gcc */
878 struct ip6ctlparam ip6cp1;
881 * Notify the error to all possible sockets via pfctlinput2.
882 * Since the upper layer information (such as protocol type,
883 * source and destination ports) is embedded in the encrypted
884 * data and might have been cut, we can't directly call
885 * an upper layer ctlinput function. However, the pcbnotify
886 * function will consider source and destination addresses
887 * as well as the flow info value, and may be able to find
888 * some PCB that should be notified.
889 * Although pfctlinput2 will call esp6_ctlinput(), there is
890 * no possibility of an infinite loop of function calls,
891 * because we don't pass the inner IPv6 header.
893 bzero(&ip6cp1, sizeof(ip6cp1));
894 ip6cp1.ip6c_src = ip6cp->ip6c_src;
895 pfctlinput2(cmd, sa, (void *)&ip6cp1);
898 * Then go to special cases that need ESP header information.
899 * XXX: We assume that when ip6 is non NULL,
900 * M and OFF are valid.
903 if (cmd == PRC_MSGSIZE) {
904 struct secasvar *sav;
908 /* check header length before using m_copydata */
909 if (m->m_pkthdr.len < off + sizeof (struct esp))
911 m_copydata(m, off + offsetof(struct esp, esp_spi),
912 sizeof(u_int32_t), (caddr_t) &spi);
914 * Check to see if we have a valid SA corresponding to
915 * the address in the ICMP message payload.
917 sav = KEY_ALLOCSA((union sockaddr_union *)sa,
919 valid = (sav != NULL);
923 /* XXX Further validation? */
926 * Depending on whether the SA is "valid" and
927 * routing table size (mtudisc_{hi,lo}wat), we will:
928 * - recalcurate the new MTU and create the
929 * corresponding routing entry, or
930 * - ignore the MTU change notification.
932 icmp6_mtudisc_update(ip6cp, valid);
935 /* we normally notify any pcb here */