1 /* $FreeBSD: src/sys/netipsec/xform_ah.c,v 1.1.4.2 2003/02/26 00:14:05 sam Exp $ */
2 /* $DragonFly: src/sys/netproto/ipsec/xform_ah.c,v 1.5 2004/10/15 22:59:10 hsu Exp $ */
3 /* $OpenBSD: ip_ah.c,v 1.63 2001/06/26 06:18:58 angelos Exp $ */
5 * The authors of this code are John Ioannidis (ji@tla.org),
6 * Angelos D. Keromytis (kermit@csd.uch.gr) and
7 * Niels Provos (provos@physnet.uni-hamburg.de).
9 * The original version of this code was written by John Ioannidis
10 * for BSD/OS in Athens, Greece, in November 1995.
12 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
13 * by Angelos D. Keromytis.
15 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
18 * Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist.
20 * Copyright (c) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
21 * Angelos D. Keromytis and Niels Provos.
22 * Copyright (c) 1999 Niklas Hallqvist.
23 * Copyright (c) 2001 Angelos D. Keromytis.
25 * Permission to use, copy, and modify this software with or without fee
26 * is hereby granted, provided that this entire notice is included in
27 * all copies of any software which is or includes a copy or
28 * modification of this software.
29 * You may use this code under the GNU public license if you so wish. Please
30 * contribute changes back to the authors under this freer than GPL license
31 * so that we may further the use of strong encryption without limitations to
34 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
35 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
36 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
37 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
41 #include "opt_inet6.h"
43 #include <sys/param.h>
44 #include <sys/systm.h>
46 #include <sys/socket.h>
47 #include <sys/syslog.h>
48 #include <sys/kernel.h>
49 #include <sys/sysctl.h>
53 #include <netinet/in.h>
54 #include <netinet/in_systm.h>
55 #include <netinet/ip.h>
56 #include <netinet/ip_ecn.h>
57 #include <netinet/ip6.h>
59 #include <net/route.h>
60 #include <netproto/ipsec/ipsec.h>
61 #include <netproto/ipsec/ah.h>
62 #include <netproto/ipsec/ah_var.h>
63 #include <netproto/ipsec/xform.h>
66 #include <netinet6/ip6_var.h>
67 #include <netproto/ipsec/ipsec6.h>
68 #include <netinet6/ip6_ecn.h>
71 #include <netproto/ipsec/key.h>
72 #include <netproto/ipsec/key_debug.h>
74 #include <opencrypto/cryptodev.h>
77 * Return header size in bytes. The old protocol did not support
78 * the replay counter; the new protocol always includes the counter.
80 #define HDRSIZE(sav) \
81 (((sav)->flags & SADB_X_EXT_OLD) ? \
82 sizeof (struct ah) : sizeof (struct ah) + sizeof (u_int32_t))
84 * Return authenticator size in bytes. The old protocol is known
85 * to use a fixed 16-byte authenticator. The new algorithm gets
86 * this size from the xform but is (currently) always 12.
88 #define AUTHSIZE(sav) \
89 ((sav->flags & SADB_X_EXT_OLD) ? 16 : (sav)->tdb_authalgxform->authsize)
91 int ah_enable = 1; /* control flow of packets with AH */
92 int ah_cleartos = 1; /* clear ip_tos when doing AH calc */
95 SYSCTL_DECL(_net_inet_ah);
96 SYSCTL_INT(_net_inet_ah, OID_AUTO,
97 ah_enable, CTLFLAG_RW, &ah_enable, 0, "");
98 SYSCTL_INT(_net_inet_ah, OID_AUTO,
99 ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, "");
100 SYSCTL_STRUCT(_net_inet_ah, IPSECCTL_STATS,
101 stats, CTLFLAG_RD, &ahstat, ahstat, "");
103 static unsigned char ipseczeroes[256]; /* larger than an ip6 extension hdr */
105 static int ah_input_cb(struct cryptop*);
106 static int ah_output_cb(struct cryptop*);
109 * NB: this is public for use by the PF_KEY support.
112 ah_algorithm_lookup(int alg)
114 if (alg >= AH_ALG_MAX)
117 case SADB_X_AALG_NULL:
118 return &auth_hash_null;
119 case SADB_AALG_MD5HMAC:
120 return &auth_hash_hmac_md5_96;
121 case SADB_AALG_SHA1HMAC:
122 return &auth_hash_hmac_sha1_96;
123 case SADB_X_AALG_RIPEMD160HMAC:
124 return &auth_hash_hmac_ripemd_160_96;
125 case SADB_X_AALG_MD5:
126 return &auth_hash_key_md5;
127 case SADB_X_AALG_SHA:
128 return &auth_hash_key_sha1;
129 case SADB_X_AALG_SHA2_256:
130 return &auth_hash_hmac_sha2_256;
131 case SADB_X_AALG_SHA2_384:
132 return &auth_hash_hmac_sha2_384;
133 case SADB_X_AALG_SHA2_512:
134 return &auth_hash_hmac_sha2_512;
140 ah_hdrsiz(struct secasvar *sav)
146 KASSERT(sav->tdb_authalgxform != NULL,
147 ("ah_hdrsiz: null xform"));
148 /*XXX not right for null algorithm--does it matter??*/
149 authsize = AUTHSIZE(sav);
150 size = roundup(authsize, sizeof (u_int32_t)) + HDRSIZE(sav);
153 size = sizeof (struct ah) + sizeof (u_int32_t) + 16;
159 * NB: public for use by esp_init.
162 ah_init0(struct secasvar *sav, struct xformsw *xsp, struct cryptoini *cria)
164 struct auth_hash *thash;
167 thash = ah_algorithm_lookup(sav->alg_auth);
169 DPRINTF(("ah_init: unsupported authentication algorithm %u\n",
174 * Verify the replay state block allocation is consistent with
175 * the protocol type. We check here so we can make assumptions
176 * later during protocol processing.
178 /* NB: replay state is setup elsewhere (sigh) */
179 if (((sav->flags&SADB_X_EXT_OLD) == 0) ^ (sav->replay != NULL)) {
180 DPRINTF(("ah_init: replay state block inconsistency, "
181 "%s algorithm %s replay state\n",
182 (sav->flags & SADB_X_EXT_OLD) ? "old" : "new",
183 sav->replay == NULL ? "without" : "with"));
186 if (sav->key_auth == NULL) {
187 DPRINTF(("ah_init: no authentication key for %s "
188 "algorithm\n", thash->name));
191 keylen = _KEYLEN(sav->key_auth);
192 if (keylen != thash->keysize && thash->keysize != 0) {
193 DPRINTF(("ah_init: invalid keylength %d, algorithm "
194 "%s requires keysize %d\n",
195 keylen, thash->name, thash->keysize));
199 sav->tdb_xform = xsp;
200 sav->tdb_authalgxform = thash;
202 /* Initialize crypto session. */
203 bzero(cria, sizeof (*cria));
204 cria->cri_alg = sav->tdb_authalgxform->type;
205 cria->cri_klen = _KEYBITS(sav->key_auth);
206 cria->cri_key = _KEYBUF(sav->key_auth);
212 * ah_init() is called when an SPI is being set up.
215 ah_init(struct secasvar *sav, struct xformsw *xsp)
217 struct cryptoini cria;
220 error = ah_init0(sav, xsp, &cria);
221 return error ? error :
222 crypto_newsession(&sav->tdb_cryptoid, &cria, crypto_support);
228 * NB: public for use by esp_zeroize (XXX).
231 ah_zeroize(struct secasvar *sav)
236 bzero(_KEYBUF(sav->key_auth), _KEYLEN(sav->key_auth));
238 err = crypto_freesession(sav->tdb_cryptoid);
239 sav->tdb_cryptoid = 0;
240 sav->tdb_authalgxform = NULL;
241 sav->tdb_xform = NULL;
246 * Massage IPv4/IPv6 headers for AH processing.
249 ah_massage_headers(struct mbuf **m0, int proto, int skip, int alg, int out)
251 struct mbuf *m = *m0;
260 struct ip6_ext *ip6e;
269 * This is the least painful way of dealing with IPv4 header
270 * and option processing -- just make sure they're in
273 *m0 = m = m_pullup(m, skip);
275 DPRINTF(("ah_massage_headers: m_pullup failed\n"));
279 /* Fix the IP header */
280 ip = mtod(m, struct ip *);
287 * On input, fix ip_len which has been byte-swapped
291 ip->ip_len = htons(ip->ip_len + skip);
293 if (alg == CRYPTO_MD5_KPDK || alg == CRYPTO_SHA1_KPDK)
294 ip->ip_off = htons(ip->ip_off & IP_DF);
298 if (alg == CRYPTO_MD5_KPDK || alg == CRYPTO_SHA1_KPDK)
299 ip->ip_off = htons(ntohs(ip->ip_off) & IP_DF);
304 ptr = mtod(m, unsigned char *) + sizeof(struct ip);
306 /* IPv4 option processing */
307 for (off = sizeof(struct ip); off < skip;) {
308 if (ptr[off] == IPOPT_EOL || ptr[off] == IPOPT_NOP ||
312 DPRINTF(("ah_massage_headers: illegal IPv4 "
313 "option length for option %d\n",
322 off = skip; /* End the loop. */
329 case IPOPT_SECURITY: /* 0x82 */
330 case 0x85: /* Extended security. */
331 case 0x86: /* Commercial security. */
332 case 0x94: /* Router alert */
333 case 0x95: /* RFC1770 */
334 /* Sanity check for option length. */
335 if (ptr[off + 1] < 2) {
336 DPRINTF(("ah_massage_headers: "
337 "illegal IPv4 option length for "
338 "option %d\n", ptr[off]));
349 /* Sanity check for option length. */
350 if (ptr[off + 1] < 2) {
351 DPRINTF(("ah_massage_headers: "
352 "illegal IPv4 option length for "
353 "option %d\n", ptr[off]));
360 * On output, if we have either of the
361 * source routing options, we should
362 * swap the destination address of the
363 * IP header with the last address
364 * specified in the option, as that is
365 * what the destination's IP header
369 bcopy(ptr + off + ptr[off + 1] -
370 sizeof(struct in_addr),
371 &(ip->ip_dst), sizeof(struct in_addr));
375 /* Sanity check for option length. */
376 if (ptr[off + 1] < 2) {
377 DPRINTF(("ah_massage_headers: "
378 "illegal IPv4 option length for "
379 "option %d\n", ptr[off]));
384 /* Zeroize all other options. */
385 count = ptr[off + 1];
386 bcopy(ipseczeroes, ptr, count);
393 DPRINTF(("ah_massage_headers(): malformed "
394 "IPv4 options header\n"));
405 case AF_INET6: /* Ugly... */
406 /* Copy and "cook" the IPv6 header. */
407 m_copydata(m, 0, sizeof(ip6), (caddr_t) &ip6);
409 /* We don't do IPv6 Jumbograms. */
410 if (ip6.ip6_plen == 0) {
411 DPRINTF(("ah_massage_headers: unsupported IPv6 jumbogram\n"));
418 ip6.ip6_vfc &= ~IPV6_VERSION_MASK;
419 ip6.ip6_vfc |= IPV6_VERSION;
421 /* Scoped address handling. */
422 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_src))
423 ip6.ip6_src.s6_addr16[1] = 0;
424 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_dst))
425 ip6.ip6_dst.s6_addr16[1] = 0;
427 /* Done with IPv6 header. */
428 m_copyback(m, 0, sizeof(struct ip6_hdr), (caddr_t) &ip6);
430 /* Let's deal with the remaining headers (if any). */
431 if (skip - sizeof(struct ip6_hdr) > 0) {
432 if (m->m_len <= skip) {
433 ptr = malloc(skip - sizeof(struct ip6_hdr),
434 M_XDATA, M_INTWAIT | M_NULLOK);
436 DPRINTF(("ah_massage_headers: failed "
437 "to allocate memory for IPv6 "
444 * Copy all the protocol headers after
447 m_copydata(m, sizeof(struct ip6_hdr),
448 skip - sizeof(struct ip6_hdr), ptr);
451 /* No need to allocate memory. */
452 ptr = mtod(m, unsigned char *) +
453 sizeof(struct ip6_hdr);
459 off = ip6.ip6_nxt & 0xff; /* Next header type. */
461 for (len = 0; len < skip - sizeof(struct ip6_hdr);)
463 case IPPROTO_HOPOPTS:
464 case IPPROTO_DSTOPTS:
465 ip6e = (struct ip6_ext *) (ptr + len);
468 * Process the mutable/immutable
469 * options -- borrows heavily from the
472 for (count = len + sizeof(struct ip6_ext);
473 count < len + ((ip6e->ip6e_len + 1) << 3);) {
474 if (ptr[count] == IP6OPT_PAD1) {
476 continue; /* Skip padding. */
481 ((ip6e->ip6e_len + 1) << 3)) {
484 /* Free, if we allocated. */
492 /* If mutable option, zeroize. */
493 if (ptr[count] & IP6OPT_MUTABLE)
494 bcopy(ipseczeroes, ptr + count,
501 skip - sizeof(struct ip6_hdr)) {
504 /* Free, if we allocated. */
512 len += ((ip6e->ip6e_len + 1) << 3);
513 off = ip6e->ip6e_nxt;
516 case IPPROTO_ROUTING:
518 * Always include routing headers in
521 ip6e = (struct ip6_ext *) (ptr + len);
522 len += ((ip6e->ip6e_len + 1) << 3);
523 off = ip6e->ip6e_nxt;
527 DPRINTF(("ah_massage_headers: unexpected "
528 "IPv6 header type %d", off));
535 /* Copyback and free, if we allocated. */
537 m_copyback(m, sizeof(struct ip6_hdr),
538 skip - sizeof(struct ip6_hdr), ptr);
550 * ah_input() gets called to verify that an input packet
551 * passes authentication.
554 ah_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
556 struct auth_hash *ahx;
557 struct tdb_ident *tdbi;
558 struct tdb_crypto *tc;
561 int hl, rplen, authsize;
563 struct cryptodesc *crda;
566 SPLASSERT(net, "ah_input");
568 KASSERT(sav != NULL, ("ah_input: null SA"));
569 KASSERT(sav->key_auth != NULL,
570 ("ah_input: null authentication key"));
571 KASSERT(sav->tdb_authalgxform != NULL,
572 ("ah_input: null authentication xform"));
574 /* Figure out header size. */
575 rplen = HDRSIZE(sav);
577 /* XXX don't pullup, just copy header */
578 IP6_EXTHDR_GET(ah, struct newah *, m, skip, rplen);
580 DPRINTF(("ah_input: cannot pullup header\n"));
581 ahstat.ahs_hdrops++; /*XXX*/
586 /* Check replay window, if applicable. */
587 if (sav->replay && !ipsec_chkreplay(ntohl(ah->ah_seq), sav)) {
589 DPRINTF(("ah_input: packet replay failure: %s\n",
590 ipsec_logsastr(sav)));
595 /* Verify AH header length. */
596 hl = ah->ah_len * sizeof (u_int32_t);
597 ahx = sav->tdb_authalgxform;
598 authsize = AUTHSIZE(sav);
599 if (hl != authsize + rplen - sizeof (struct ah)) {
600 DPRINTF(("ah_input: bad authenticator length %u (expecting %lu)"
601 " for packet in SA %s/%08lx\n",
602 hl, (u_long) (authsize + rplen - sizeof (struct ah)),
603 ipsec_address(&sav->sah->saidx.dst),
604 (u_long) ntohl(sav->spi)));
605 ahstat.ahs_badauthl++;
609 ahstat.ahs_ibytes += m->m_pkthdr.len - skip - hl;
611 /* Get crypto descriptors. */
612 crp = crypto_getreq(1);
614 DPRINTF(("ah_input: failed to acquire crypto descriptor\n"));
620 crda = crp->crp_desc;
621 KASSERT(crda != NULL, ("ah_input: null crypto descriptor"));
624 crda->crd_len = m->m_pkthdr.len;
625 crda->crd_inject = skip + rplen;
627 /* Authentication operation. */
628 crda->crd_alg = ahx->type;
629 crda->crd_key = _KEYBUF(sav->key_auth);
630 crda->crd_klen = _KEYBITS(sav->key_auth);
632 /* Find out if we've already done crypto. */
633 for (mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, NULL);
635 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, mtag)) {
636 tdbi = (struct tdb_ident *) (mtag + 1);
637 if (tdbi->proto == sav->sah->saidx.proto &&
638 tdbi->spi == sav->spi &&
639 !bcmp(&tdbi->dst, &sav->sah->saidx.dst,
640 sizeof (union sockaddr_union)))
644 /* Allocate IPsec-specific opaque crypto info. */
646 tc = malloc(sizeof (struct tdb_crypto) +
647 skip + rplen + authsize, M_XDATA,
648 M_INTWAIT | M_ZERO | M_NULLOK);
650 /* Hash verification has already been done successfully. */
651 tc = malloc(sizeof (struct tdb_crypto),
652 M_XDATA, M_INTWAIT | M_ZERO | M_NULLOK);
655 DPRINTF(("ah_input: failed to allocate tdb_crypto\n"));
662 /* Only save information if crypto processing is needed. */
667 * Save the authenticator, the skipped portion of the packet,
670 m_copydata(m, 0, skip + rplen + authsize, (caddr_t)(tc+1));
672 /* Zeroize the authenticator on the packet. */
673 m_copyback(m, skip + rplen, authsize, ipseczeroes);
675 /* "Massage" the packet headers for crypto processing. */
676 error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
679 /* NB: mbuf is free'd by ah_massage_headers */
687 /* Crypto operation descriptor. */
688 crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
689 crp->crp_flags = CRYPTO_F_IMBUF;
690 crp->crp_buf = (caddr_t) m;
691 crp->crp_callback = ah_input_cb;
692 crp->crp_sid = sav->tdb_cryptoid;
693 crp->crp_opaque = (caddr_t) tc;
695 /* These are passed as-is to the callback. */
696 tc->tc_spi = sav->spi;
697 tc->tc_dst = sav->sah->saidx.dst;
698 tc->tc_proto = sav->sah->saidx.proto;
699 tc->tc_nxt = ah->ah_nxt;
700 tc->tc_protoff = protoff;
702 tc->tc_ptr = (caddr_t) mtag; /* Save the mtag we've identified. */
705 return crypto_dispatch(crp);
707 return ah_input_cb(crp);
711 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do { \
712 if (saidx->dst.sa.sa_family == AF_INET6) { \
713 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
715 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
719 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) \
720 (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
724 * AH input callback from the crypto driver.
727 ah_input_cb(struct cryptop *crp)
729 int rplen, error, skip, protoff;
730 unsigned char calc[AH_ALEN_MAX];
732 struct cryptodesc *crd;
733 struct auth_hash *ahx;
734 struct tdb_crypto *tc;
736 struct secasvar *sav;
737 struct secasindex *saidx;
744 tc = (struct tdb_crypto *) crp->crp_opaque;
745 KASSERT(tc != NULL, ("ah_input_cb: null opaque crypto data area!"));
748 protoff = tc->tc_protoff;
749 mtag = (struct m_tag *) tc->tc_ptr;
750 m = (struct mbuf *) crp->crp_buf;
754 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
757 DPRINTF(("ah_input_cb: SA expired while in crypto\n"));
758 error = ENOBUFS; /*XXX*/
762 saidx = &sav->sah->saidx;
763 KASSERT(saidx->dst.sa.sa_family == AF_INET ||
764 saidx->dst.sa.sa_family == AF_INET6,
765 ("ah_input_cb: unexpected protocol family %u",
766 saidx->dst.sa.sa_family));
768 ahx = (struct auth_hash *) sav->tdb_authalgxform;
770 /* Check for crypto errors. */
771 if (crp->crp_etype) {
772 if (sav->tdb_cryptoid != 0)
773 sav->tdb_cryptoid = crp->crp_sid;
775 if (crp->crp_etype == EAGAIN)
776 return crypto_dispatch(crp);
778 ahstat.ahs_noxform++;
779 DPRINTF(("ah_input_cb: crypto error %d\n", crp->crp_etype));
780 error = crp->crp_etype;
783 ahstat.ahs_hist[sav->alg_auth]++;
784 crypto_freereq(crp); /* No longer needed. */
788 /* Shouldn't happen... */
791 DPRINTF(("ah_input_cb: bogus returned buffer from crypto\n"));
796 /* Figure out header size. */
797 rplen = HDRSIZE(sav);
798 authsize = AUTHSIZE(sav);
800 /* Copy authenticator off the packet. */
801 m_copydata(m, skip + rplen, authsize, calc);
804 * If we have an mtag, we don't need to verify the authenticator --
805 * it has been verified by an IPsec-aware NIC.
808 ptr = (caddr_t) (tc + 1);
810 /* Verify authenticator. */
811 if (bcmp(ptr + skip + rplen, calc, authsize)) {
812 DPRINTF(("ah_input: authentication hash mismatch "
813 "for packet in SA %s/%08lx\n",
814 ipsec_address(&saidx->dst),
815 (u_long) ntohl(sav->spi)));
816 ahstat.ahs_badauth++;
821 /* Fix the Next Protocol field. */
822 ((u_int8_t *) ptr)[protoff] = nxt;
824 /* Copyback the saved (uncooked) network headers. */
825 m_copyback(m, 0, skip, ptr);
827 /* Fix the Next Protocol field. */
828 m_copyback(m, protoff, sizeof(u_int8_t), &nxt);
831 free(tc, M_XDATA), tc = NULL; /* No longer needed */
834 * Header is now authenticated.
836 m->m_flags |= M_AUTHIPHDR|M_AUTHIPDGM;
839 * Update replay sequence number, if appropriate.
844 m_copydata(m, skip + offsetof(struct newah, ah_seq),
845 sizeof (seq), (caddr_t) &seq);
846 if (ipsec_updatereplay(ntohl(seq), sav)) {
848 error = ENOBUFS; /*XXX as above*/
854 * Remove the AH header and authenticator from the mbuf.
856 error = m_striphdr(m, skip, rplen + authsize);
858 DPRINTF(("ah_input_cb: mangled mbuf chain for SA %s/%08lx\n",
859 ipsec_address(&saidx->dst), (u_long) ntohl(sav->spi)));
865 IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag);
884 * AH output routine, called by ipsec[46]_process_packet().
889 struct ipsecrequest *isr,
894 struct secasvar *sav;
895 struct auth_hash *ahx;
896 struct cryptodesc *crda;
897 struct tdb_crypto *tc;
901 int error, rplen, authsize, maxpacketsize, roff;
905 SPLASSERT(net, "ah_output");
908 KASSERT(sav != NULL, ("ah_output: null SA"));
909 ahx = sav->tdb_authalgxform;
910 KASSERT(ahx != NULL, ("ah_output: null authentication xform"));
914 /* Figure out header size. */
915 rplen = HDRSIZE(sav);
917 /* Check for maximum packet size violations. */
918 switch (sav->sah->saidx.dst.sa.sa_family) {
921 maxpacketsize = IP_MAXPACKET;
926 maxpacketsize = IPV6_MAXPACKET;
930 DPRINTF(("ah_output: unknown/unsupported protocol "
931 "family %u, SA %s/%08lx\n",
932 sav->sah->saidx.dst.sa.sa_family,
933 ipsec_address(&sav->sah->saidx.dst),
934 (u_long) ntohl(sav->spi)));
936 error = EPFNOSUPPORT;
939 authsize = AUTHSIZE(sav);
940 if (rplen + authsize + m->m_pkthdr.len > maxpacketsize) {
941 DPRINTF(("ah_output: packet in SA %s/%08lx got too big "
942 "(len %u, max len %u)\n",
943 ipsec_address(&sav->sah->saidx.dst),
944 (u_long) ntohl(sav->spi),
945 rplen + authsize + m->m_pkthdr.len, maxpacketsize));
951 /* Update the counters. */
952 ahstat.ahs_obytes += m->m_pkthdr.len - skip;
956 DPRINTF(("ah_output: cannot clone mbuf chain, SA %s/%08lx\n",
957 ipsec_address(&sav->sah->saidx.dst),
958 (u_long) ntohl(sav->spi)));
964 /* Inject AH header. */
965 mi = m_makespace(m, skip, rplen + authsize, &roff);
967 DPRINTF(("ah_output: failed to inject %u byte AH header for SA "
970 ipsec_address(&sav->sah->saidx.dst),
971 (u_long) ntohl(sav->spi)));
972 ahstat.ahs_hdrops++; /*XXX differs from openbsd */
978 * The AH header is guaranteed by m_makespace() to be in
979 * contiguous memory, at roff bytes offset into the returned mbuf.
981 ah = (struct newah *)(mtod(mi, caddr_t) + roff);
983 /* Initialize the AH header. */
984 m_copydata(m, protoff, sizeof(u_int8_t), (caddr_t) &ah->ah_nxt);
985 ah->ah_len = (rplen + authsize - sizeof(struct ah)) / sizeof(u_int32_t);
987 ah->ah_spi = sav->spi;
989 /* Zeroize authenticator. */
990 m_copyback(m, skip + rplen, authsize, ipseczeroes);
992 /* Insert packet replay counter, as requested. */
994 if (sav->replay->count == ~0 &&
995 (sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
996 DPRINTF(("ah_output: replay counter wrapped for SA "
998 ipsec_address(&sav->sah->saidx.dst),
999 (u_long) ntohl(sav->spi)));
1004 sav->replay->count++;
1005 ah->ah_seq = htonl(sav->replay->count);
1008 /* Get crypto descriptors. */
1009 crp = crypto_getreq(1);
1011 DPRINTF(("ah_output: failed to acquire crypto descriptors\n"));
1012 ahstat.ahs_crypto++;
1017 crda = crp->crp_desc;
1020 crda->crd_inject = skip + rplen;
1021 crda->crd_len = m->m_pkthdr.len;
1023 /* Authentication operation. */
1024 crda->crd_alg = ahx->type;
1025 crda->crd_key = _KEYBUF(sav->key_auth);
1026 crda->crd_klen = _KEYBITS(sav->key_auth);
1028 /* Allocate IPsec-specific opaque crypto info. */
1029 tc = malloc(sizeof(struct tdb_crypto) + skip, M_XDATA,
1030 M_INTWAIT | M_ZERO | M_NULLOK);
1032 crypto_freereq(crp);
1033 DPRINTF(("ah_output: failed to allocate tdb_crypto\n"));
1034 ahstat.ahs_crypto++;
1039 /* Save the skipped portion of the packet. */
1040 m_copydata(m, 0, skip, (caddr_t) (tc + 1));
1043 * Fix IP header length on the header used for
1044 * authentication. We don't need to fix the original
1045 * header length as it will be fixed by our caller.
1047 switch (sav->sah->saidx.dst.sa.sa_family) {
1050 bcopy(((caddr_t)(tc + 1)) +
1051 offsetof(struct ip, ip_len),
1052 (caddr_t) &iplen, sizeof(u_int16_t));
1053 iplen = htons(ntohs(iplen) + rplen + authsize);
1054 m_copyback(m, offsetof(struct ip, ip_len),
1055 sizeof(u_int16_t), (caddr_t) &iplen);
1061 bcopy(((caddr_t)(tc + 1)) +
1062 offsetof(struct ip6_hdr, ip6_plen),
1063 (caddr_t) &iplen, sizeof(u_int16_t));
1064 iplen = htons(ntohs(iplen) + rplen + authsize);
1065 m_copyback(m, offsetof(struct ip6_hdr, ip6_plen),
1066 sizeof(u_int16_t), (caddr_t) &iplen);
1071 /* Fix the Next Header field in saved header. */
1072 ((u_int8_t *) (tc + 1))[protoff] = IPPROTO_AH;
1074 /* Update the Next Protocol field in the IP header. */
1076 m_copyback(m, protoff, sizeof(u_int8_t), (caddr_t) &prot);
1078 /* "Massage" the packet headers for crypto processing. */
1079 error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
1080 skip, ahx->type, 1);
1082 m = NULL; /* mbuf was free'd by ah_massage_headers. */
1084 crypto_freereq(crp);
1088 /* Crypto operation descriptor. */
1089 crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
1090 crp->crp_flags = CRYPTO_F_IMBUF;
1091 crp->crp_buf = (caddr_t) m;
1092 crp->crp_callback = ah_output_cb;
1093 crp->crp_sid = sav->tdb_cryptoid;
1094 crp->crp_opaque = (caddr_t) tc;
1096 /* These are passed as-is to the callback. */
1098 tc->tc_spi = sav->spi;
1099 tc->tc_dst = sav->sah->saidx.dst;
1100 tc->tc_proto = sav->sah->saidx.proto;
1102 tc->tc_protoff = protoff;
1104 return crypto_dispatch(crp);
1112 * AH output callback from the crypto driver.
1115 ah_output_cb(struct cryptop *crp)
1117 int skip, protoff, error;
1118 struct tdb_crypto *tc;
1119 struct ipsecrequest *isr;
1120 struct secasvar *sav;
1125 tc = (struct tdb_crypto *) crp->crp_opaque;
1126 KASSERT(tc != NULL, ("ah_output_cb: null opaque data area!"));
1128 protoff = tc->tc_protoff;
1129 ptr = (caddr_t) (tc + 1);
1130 m = (struct mbuf *) crp->crp_buf;
1135 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
1138 DPRINTF(("ah_output_cb: SA expired while in crypto\n"));
1139 error = ENOBUFS; /*XXX*/
1142 KASSERT(isr->sav == sav, ("ah_output_cb: SA changed\n"));
1144 /* Check for crypto errors. */
1145 if (crp->crp_etype) {
1146 if (sav->tdb_cryptoid != 0)
1147 sav->tdb_cryptoid = crp->crp_sid;
1149 if (crp->crp_etype == EAGAIN) {
1152 return crypto_dispatch(crp);
1155 ahstat.ahs_noxform++;
1156 DPRINTF(("ah_output_cb: crypto error %d\n", crp->crp_etype));
1157 error = crp->crp_etype;
1161 /* Shouldn't happen... */
1163 ahstat.ahs_crypto++;
1164 DPRINTF(("ah_output_cb: bogus returned buffer from crypto\n"));
1168 ahstat.ahs_hist[sav->alg_auth]++;
1171 * Copy original headers (with the new protocol number) back
1174 m_copyback(m, 0, skip, ptr);
1176 /* No longer needed. */
1178 crypto_freereq(crp);
1180 /* NB: m is reclaimed by ipsec_process_done. */
1181 err = ipsec_process_done(m, isr);
1192 crypto_freereq(crp);
1196 static struct xformsw ah_xformsw = {
1197 XF_AH, XFT_AUTH, "IPsec AH",
1198 ah_init, ah_zeroize, ah_input, ah_output,
1204 xform_register(&ah_xformsw);
1206 SYSINIT(ah_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ah_attach, NULL);