1 /* $FreeBSD: src/sys/netipsec/xform_esp.c,v 1.2.2.2 2003/02/26 00:14:05 sam Exp $ */
2 /* $OpenBSD: ip_esp.c,v 1.69 2001/06/26 06:18:59 angelos 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 * The original version of this code was written by John Ioannidis
9 * for BSD/OS in Athens, Greece, in November 1995.
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
39 #include "opt_inet6.h"
41 #include <sys/param.h>
42 #include <sys/systm.h>
44 #include <sys/socket.h>
45 #include <sys/syslog.h>
46 #include <sys/kernel.h>
47 #include <sys/random.h>
48 #include <sys/sysctl.h>
52 #include <netinet/in.h>
53 #include <netinet/in_systm.h>
54 #include <netinet/ip.h>
55 #include <netinet/ip_ecn.h>
56 #include <netinet/ip6.h>
58 #include <net/route.h>
59 #include <netipsec/ipsec.h>
60 #include <netipsec/ah.h>
61 #include <netipsec/ah_var.h>
62 #include <netipsec/esp.h>
63 #include <netipsec/esp_var.h>
64 #include <netipsec/xform.h>
67 #include <netinet6/ip6_var.h>
68 #include <netipsec/ipsec6.h>
69 #include <netinet6/ip6_ecn.h>
72 #include <netipsec/key.h>
73 #include <netipsec/key_debug.h>
75 #include <opencrypto/cryptodev.h>
76 #include <opencrypto/xform.h>
79 struct espstat espstat;
81 SYSCTL_DECL(_net_inet_esp);
82 SYSCTL_INT(_net_inet_esp, OID_AUTO,
83 esp_enable, CTLFLAG_RW, &esp_enable, 0, "");
84 SYSCTL_STRUCT(_net_inet_esp, IPSECCTL_STATS,
85 stats, CTLFLAG_RD, &espstat, espstat, "");
87 static int esp_max_ivlen; /* max iv length over all algorithms */
89 static int esp_input_cb(struct cryptop *op);
90 static int esp_output_cb(struct cryptop *crp);
93 * NB: this is public for use by the PF_KEY support.
94 * NB: if you add support here; be sure to add code to esp_attach below!
97 esp_algorithm_lookup(int alg)
99 if (alg >= ESP_ALG_MAX)
102 case SADB_EALG_DESCBC:
103 return &enc_xform_des;
104 case SADB_EALG_3DESCBC:
105 return &enc_xform_3des;
106 case SADB_X_EALG_AES:
107 return &enc_xform_rijndael128;
108 case SADB_X_EALG_BLOWFISHCBC:
109 return &enc_xform_blf;
110 case SADB_X_EALG_CAST128CBC:
111 return &enc_xform_cast5;
112 case SADB_X_EALG_SKIPJACK:
113 return &enc_xform_skipjack;
115 return &enc_xform_null;
121 esp_hdrsiz(struct secasvar *sav)
126 /*XXX not right for null algorithm--does it matter??*/
127 KASSERT(sav->tdb_encalgxform != NULL,
128 ("esp_hdrsiz: SA with null xform"));
129 if (sav->flags & SADB_X_EXT_OLD)
130 size = sizeof (struct esp);
132 size = sizeof (struct newesp);
133 size += sav->tdb_encalgxform->blocksize + 9;
134 /*XXX need alg check???*/
135 if (sav->tdb_authalgxform != NULL && sav->replay)
136 size += ah_hdrsiz(sav);
140 * + max iv length for CBC mode
142 * + sizeof (pad length field)
143 * + sizeof (next header field)
144 * + max icv supported.
146 size = sizeof (struct newesp) + esp_max_ivlen + 9 + 16;
152 * esp_init() is called when an SPI is being set up.
155 esp_init(struct secasvar *sav, struct xformsw *xsp)
157 struct enc_xform *txform;
158 struct cryptoini cria, crie;
162 txform = esp_algorithm_lookup(sav->alg_enc);
163 if (txform == NULL) {
164 DPRINTF(("esp_init: unsupported encryption algorithm %d\n",
168 if (sav->key_enc == NULL) {
169 DPRINTF(("esp_init: no encoding key for %s algorithm\n",
173 if ((sav->flags&(SADB_X_EXT_OLD|SADB_X_EXT_IV4B)) == SADB_X_EXT_IV4B) {
174 DPRINTF(("esp_init: 4-byte IV not supported with protocol\n"));
177 keylen = _KEYLEN(sav->key_enc);
178 if (txform->minkey > keylen || keylen > txform->maxkey) {
179 DPRINTF(("esp_init: invalid key length %u, must be in "
180 "the range [%u..%u] for algorithm %s\n",
181 keylen, txform->minkey, txform->maxkey,
187 * NB: The null xform needs a non-zero blocksize to keep the
188 * crypto code happy but if we use it to set ivlen then
189 * the ESP header will be processed incorrectly. The
190 * compromise is to force it to zero here.
192 sav->ivlen = (txform == &enc_xform_null ? 0 : txform->blocksize);
193 sav->iv = (caddr_t) malloc(sav->ivlen, M_XDATA, M_WAITOK);
194 if (sav->iv == NULL) {
195 DPRINTF(("esp_init: no memory for IV\n"));
198 key_randomfill(sav->iv, sav->ivlen); /*XXX*/
201 * Setup AH-related state.
203 if (sav->alg_auth != 0) {
204 error = ah_init0(sav, xsp, &cria);
209 /* NB: override anything set in ah_init0 */
210 sav->tdb_xform = xsp;
211 sav->tdb_encalgxform = txform;
213 /* Initialize crypto session. */
214 bzero(&crie, sizeof (crie));
215 crie.cri_alg = sav->tdb_encalgxform->type;
216 crie.cri_klen = _KEYBITS(sav->key_enc);
217 crie.cri_key = _KEYBUF(sav->key_enc);
220 if (sav->tdb_authalgxform && sav->tdb_encalgxform) {
221 /* init both auth & enc */
222 crie.cri_next = &cria;
223 error = crypto_newsession(&sav->tdb_cryptoid,
224 &crie, crypto_support);
225 } else if (sav->tdb_encalgxform) {
226 error = crypto_newsession(&sav->tdb_cryptoid,
227 &crie, crypto_support);
228 } else if (sav->tdb_authalgxform) {
229 error = crypto_newsession(&sav->tdb_cryptoid,
230 &cria, crypto_support);
232 /* XXX cannot happen? */
233 DPRINTF(("esp_init: no encoding OR authentication xform!\n"));
243 esp_zeroize(struct secasvar *sav)
245 /* NB: ah_zerorize free's the crypto session state */
246 int error = ah_zeroize(sav);
249 bzero(_KEYBUF(sav->key_enc), _KEYLEN(sav->key_enc));
250 /* NB: sav->iv is freed elsewhere, even though we malloc it! */
251 sav->tdb_encalgxform = NULL;
252 sav->tdb_xform = NULL;
257 * ESP input processing, called (eventually) through the protocol switch.
260 esp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
262 struct auth_hash *esph;
263 struct enc_xform *espx;
264 struct tdb_ident *tdbi;
265 struct tdb_crypto *tc;
266 int plen, alen, hlen;
270 struct cryptodesc *crde;
273 SPLASSERT(net, "esp_input");
275 KASSERT(sav != NULL, ("esp_input: null SA"));
276 KASSERT(sav->tdb_encalgxform != NULL,
277 ("esp_input: null encoding xform"));
278 KASSERT((skip&3) == 0 && (m->m_pkthdr.len&3) == 0,
279 ("esp_input: misaligned packet, skip %u pkt len %u",
280 skip, m->m_pkthdr.len));
282 /* XXX don't pullup, just copy header */
283 IP6_EXTHDR_GET(esp, struct newesp *, m, skip, sizeof (struct newesp));
285 esph = sav->tdb_authalgxform;
286 espx = sav->tdb_encalgxform;
288 /* Determine the ESP header length */
289 if (sav->flags & SADB_X_EXT_OLD)
290 hlen = sizeof (struct esp) + sav->ivlen;
292 hlen = sizeof (struct newesp) + sav->ivlen;
293 /* Authenticator hash size */
294 alen = esph ? AH_HMAC_HASHLEN : 0;
297 * Verify payload length is multiple of encryption algorithm
300 * NB: This works for the null algorithm because the blocksize
301 * is 4 and all packets must be 4-byte aligned regardless
304 plen = m->m_pkthdr.len - (skip + hlen + alen);
305 if ((plen & (espx->blocksize - 1)) || (plen <= 0)) {
306 DPRINTF(("esp_input: "
307 "payload of %d octets not a multiple of %d octets,"
309 plen, espx->blocksize,
310 ipsec_address(&sav->sah->saidx.dst),
311 (u_long) ntohl(sav->spi)));
312 espstat.esps_badilen++;
318 * Check sequence number.
320 if (esph && sav->replay && !ipsec_chkreplay(ntohl(esp->esp_seq), sav)) {
321 DPRINTF(("esp_input: packet replay check for %s\n",
322 ipsec_logsastr(sav))); /*XXX*/
323 espstat.esps_replay++;
325 return ENOBUFS; /*XXX*/
328 /* Update the counters */
329 espstat.esps_ibytes += m->m_pkthdr.len - skip - hlen - alen;
331 /* Find out if we've already done crypto */
332 for (mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, NULL);
334 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, mtag)) {
335 tdbi = (struct tdb_ident *) (mtag + 1);
336 if (tdbi->proto == sav->sah->saidx.proto &&
337 tdbi->spi == sav->spi &&
338 !bcmp(&tdbi->dst, &sav->sah->saidx.dst,
339 sizeof(union sockaddr_union)))
343 /* Get crypto descriptors */
344 crp = crypto_getreq(esph && espx ? 2 : 1);
346 DPRINTF(("esp_input: failed to acquire crypto descriptors\n"));
347 espstat.esps_crypto++;
352 /* Get IPsec-specific opaque pointer */
353 if (esph == NULL || mtag != NULL)
354 tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
355 M_XDATA, M_NOWAIT|M_ZERO);
357 tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto) + alen,
358 M_XDATA, M_NOWAIT|M_ZERO);
361 DPRINTF(("esp_input: failed to allocate tdb_crypto\n"));
362 espstat.esps_crypto++;
367 tc->tc_ptr = (caddr_t) mtag;
370 struct cryptodesc *crda = crp->crp_desc;
372 KASSERT(crda != NULL, ("esp_input: null ah crypto descriptor"));
374 /* Authentication descriptor */
375 crda->crd_skip = skip;
376 crda->crd_len = m->m_pkthdr.len - (skip + alen);
377 crda->crd_inject = m->m_pkthdr.len - alen;
379 crda->crd_alg = esph->type;
380 crda->crd_key = _KEYBUF(sav->key_auth);
381 crda->crd_klen = _KEYBITS(sav->key_auth);
383 /* Copy the authenticator */
385 m_copydata(m, m->m_pkthdr.len - alen, alen,
388 /* Chain authentication request */
389 crde = crda->crd_next;
391 crde = crp->crp_desc;
394 /* Crypto operation descriptor */
395 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */
396 crp->crp_flags = CRYPTO_F_IMBUF;
397 crp->crp_buf = (caddr_t) m;
398 crp->crp_callback = esp_input_cb;
399 crp->crp_sid = sav->tdb_cryptoid;
400 crp->crp_opaque = (caddr_t) tc;
402 /* These are passed as-is to the callback */
403 tc->tc_spi = sav->spi;
404 tc->tc_dst = sav->sah->saidx.dst;
405 tc->tc_proto = sav->sah->saidx.proto;
406 tc->tc_protoff = protoff;
409 /* Decryption descriptor */
411 KASSERT(crde != NULL, ("esp_input: null esp crypto descriptor"));
412 crde->crd_skip = skip + hlen;
413 crde->crd_len = m->m_pkthdr.len - (skip + hlen + alen);
414 crde->crd_inject = skip + hlen - sav->ivlen;
416 crde->crd_alg = espx->type;
417 crde->crd_key = _KEYBUF(sav->key_enc);
418 crde->crd_klen = _KEYBITS(sav->key_enc);
423 return crypto_dispatch(crp);
425 return esp_input_cb(crp);
429 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do { \
430 if (saidx->dst.sa.sa_family == AF_INET6) { \
431 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
433 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
437 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) \
438 (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
442 * ESP input callback from the crypto driver.
445 esp_input_cb(struct cryptop *crp)
447 u_int8_t lastthree[3], aalg[AH_HMAC_HASHLEN];
448 int s, hlen, skip, protoff, error;
450 struct cryptodesc *crd;
451 struct auth_hash *esph;
452 struct enc_xform *espx;
453 struct tdb_crypto *tc;
455 struct secasvar *sav;
456 struct secasindex *saidx;
460 KASSERT(crd != NULL, ("esp_input_cb: null crypto descriptor!"));
462 tc = (struct tdb_crypto *) crp->crp_opaque;
463 KASSERT(tc != NULL, ("esp_input_cb: null opaque crypto data area!"));
465 protoff = tc->tc_protoff;
466 mtag = (struct m_tag *) tc->tc_ptr;
467 m = (struct mbuf *) crp->crp_buf;
471 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
473 espstat.esps_notdb++;
474 DPRINTF(("esp_input_cb: SA expired while in crypto "
475 "(SA %s/%08lx proto %u)\n", ipsec_address(&tc->tc_dst),
476 (u_long) ntohl(tc->tc_spi), tc->tc_proto));
477 error = ENOBUFS; /*XXX*/
481 saidx = &sav->sah->saidx;
482 KASSERT(saidx->dst.sa.sa_family == AF_INET ||
483 saidx->dst.sa.sa_family == AF_INET6,
484 ("ah_input_cb: unexpected protocol family %u",
485 saidx->dst.sa.sa_family));
487 esph = sav->tdb_authalgxform;
488 espx = sav->tdb_encalgxform;
490 /* Check for crypto errors */
491 if (crp->crp_etype) {
492 /* Reset the session ID */
493 if (sav->tdb_cryptoid != 0)
494 sav->tdb_cryptoid = crp->crp_sid;
496 if (crp->crp_etype == EAGAIN) {
499 return crypto_dispatch(crp);
502 espstat.esps_noxform++;
503 DPRINTF(("esp_input_cb: crypto error %d\n", crp->crp_etype));
504 error = crp->crp_etype;
508 /* Shouldn't happen... */
510 espstat.esps_crypto++;
511 DPRINTF(("esp_input_cb: bogus returned buffer from crypto\n"));
515 espstat.esps_hist[sav->alg_enc]++;
517 /* If authentication was performed, check now. */
520 * If we have a tag, it means an IPsec-aware NIC did
521 * the verification for us. Otherwise we need to
522 * check the authentication calculation.
524 ahstat.ahs_hist[sav->alg_auth]++;
526 /* Copy the authenticator from the packet */
527 m_copydata(m, m->m_pkthdr.len - esph->authsize,
528 esph->authsize, aalg);
530 ptr = (caddr_t) (tc + 1);
532 /* Verify authenticator */
533 if (bcmp(ptr, aalg, esph->authsize) != 0) {
534 DPRINTF(("esp_input_cb: "
535 "authentication hash mismatch for packet in SA %s/%08lx\n",
536 ipsec_address(&saidx->dst),
537 (u_long) ntohl(sav->spi)));
538 espstat.esps_badauth++;
544 /* Remove trailing authenticator */
545 m_adj(m, -(esph->authsize));
548 /* Release the crypto descriptors */
549 free(tc, M_XDATA), tc = NULL;
550 crypto_freereq(crp), crp = NULL;
553 * Packet is now decrypted.
555 m->m_flags |= M_DECRYPTED;
557 /* Determine the ESP header length */
558 if (sav->flags & SADB_X_EXT_OLD)
559 hlen = sizeof (struct esp) + sav->ivlen;
561 hlen = sizeof (struct newesp) + sav->ivlen;
563 /* Remove the ESP header and IV from the mbuf. */
564 error = m_striphdr(m, skip, hlen);
566 espstat.esps_hdrops++;
567 DPRINTF(("esp_input_cb: bad mbuf chain, SA %s/%08lx\n",
568 ipsec_address(&sav->sah->saidx.dst),
569 (u_long) ntohl(sav->spi)));
573 /* Save the last three bytes of decrypted data */
574 m_copydata(m, m->m_pkthdr.len - 3, 3, lastthree);
576 /* Verify pad length */
577 if (lastthree[1] + 2 > m->m_pkthdr.len - skip) {
578 espstat.esps_badilen++;
579 DPRINTF(("esp_input_cb: invalid padding length %d "
580 "for %u byte packet in SA %s/%08lx\n",
581 lastthree[1], m->m_pkthdr.len - skip,
582 ipsec_address(&sav->sah->saidx.dst),
583 (u_long) ntohl(sav->spi)));
588 /* Verify correct decryption by checking the last padding bytes */
589 if ((sav->flags & SADB_X_EXT_PMASK) != SADB_X_EXT_PRAND) {
590 if (lastthree[1] != lastthree[0] && lastthree[1] != 0) {
591 espstat.esps_badenc++;
592 DPRINTF(("esp_input_cb: decryption failed "
593 "for packet in SA %s/%08lx\n",
594 ipsec_address(&sav->sah->saidx.dst),
595 (u_long) ntohl(sav->spi)));
596 DPRINTF(("esp_input_cb: %x %x\n", lastthree[0], lastthree[1]));
602 /* Trim the mbuf chain to remove trailing authenticator and padding */
603 m_adj(m, -(lastthree[1] + 2));
605 /* Restore the Next Protocol field */
606 m_copyback(m, protoff, sizeof (u_int8_t), lastthree + 2);
608 IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag);
627 * ESP output routine, called by ipsec[46]_process_packet().
632 struct ipsecrequest *isr,
638 struct enc_xform *espx;
639 struct auth_hash *esph;
640 int hlen, rlen, plen, padding, blks, alen, i, roff;
641 struct mbuf *mo = (struct mbuf *) NULL;
642 struct tdb_crypto *tc;
643 struct secasvar *sav;
644 struct secasindex *saidx;
647 int error, maxpacketsize;
649 struct cryptodesc *crde = NULL, *crda = NULL;
652 SPLASSERT(net, "esp_output");
655 KASSERT(sav != NULL, ("esp_output: null SA"));
656 esph = sav->tdb_authalgxform;
657 espx = sav->tdb_encalgxform;
658 KASSERT(espx != NULL, ("esp_output: null encoding xform"));
660 if (sav->flags & SADB_X_EXT_OLD)
661 hlen = sizeof (struct esp) + sav->ivlen;
663 hlen = sizeof (struct newesp) + sav->ivlen;
665 rlen = m->m_pkthdr.len - skip; /* Raw payload length. */
667 * NB: The null encoding transform has a blocksize of 4
668 * so that headers are properly aligned.
670 blks = espx->blocksize; /* IV blocksize */
672 /* XXX clamp padding length a la KAME??? */
673 padding = ((blks - ((rlen + 2) % blks)) % blks) + 2;
674 plen = rlen + padding; /* Padded payload length. */
677 alen = AH_HMAC_HASHLEN;
681 espstat.esps_output++;
683 saidx = &sav->sah->saidx;
684 /* Check for maximum packet size violations. */
685 switch (saidx->dst.sa.sa_family) {
688 maxpacketsize = IP_MAXPACKET;
693 maxpacketsize = IPV6_MAXPACKET;
697 DPRINTF(("esp_output: unknown/unsupported protocol "
698 "family %d, SA %s/%08lx\n",
699 saidx->dst.sa.sa_family, ipsec_address(&saidx->dst),
700 (u_long) ntohl(sav->spi)));
702 error = EPFNOSUPPORT;
705 if (skip + hlen + rlen + padding + alen > maxpacketsize) {
706 DPRINTF(("esp_output: packet in SA %s/%08lx got too big "
707 "(len %u, max len %u)\n",
708 ipsec_address(&saidx->dst), (u_long) ntohl(sav->spi),
709 skip + hlen + rlen + padding + alen, maxpacketsize));
710 espstat.esps_toobig++;
715 /* Update the counters. */
716 espstat.esps_obytes += m->m_pkthdr.len - skip;
720 DPRINTF(("esp_output: cannot clone mbuf chain, SA %s/%08lx\n",
721 ipsec_address(&saidx->dst), (u_long) ntohl(sav->spi)));
722 espstat.esps_hdrops++;
727 /* Inject ESP header. */
728 mo = m_makespace(m, skip, hlen, &roff);
730 DPRINTF(("esp_output: failed to inject %u byte ESP hdr for SA "
732 hlen, ipsec_address(&saidx->dst),
733 (u_long) ntohl(sav->spi)));
734 espstat.esps_hdrops++; /* XXX diffs from openbsd */
739 /* Initialize ESP header. */
740 bcopy((caddr_t) &sav->spi, mtod(mo, caddr_t) + roff, sizeof(u_int32_t));
742 u_int32_t replay = htonl(++(sav->replay->count));
743 bcopy((caddr_t) &replay,
744 mtod(mo, caddr_t) + roff + sizeof(u_int32_t),
749 * Add padding -- better to do it ourselves than use the crypto engine,
750 * although if/when we support compression, we'd have to do that.
752 pad = (u_char *) m_pad(m, padding + alen);
754 DPRINTF(("esp_output: m_pad failed for SA %s/%08lx\n",
755 ipsec_address(&saidx->dst), (u_long) ntohl(sav->spi)));
756 m = NULL; /* NB: free'd by m_pad */
762 * Add padding: random, zero, or self-describing.
763 * XXX catch unexpected setting
765 switch (sav->flags & SADB_X_EXT_PMASK) {
766 case SADB_X_EXT_PRAND:
767 (void) read_random(pad, padding - 2);
769 case SADB_X_EXT_PZERO:
770 bzero(pad, padding - 2);
772 case SADB_X_EXT_PSEQ:
773 for (i = 0; i < padding - 2; i++)
778 /* Fix padding length and Next Protocol in padding itself. */
779 pad[padding - 2] = padding - 2;
780 m_copydata(m, protoff, sizeof(u_int8_t), pad + padding - 1);
782 /* Fix Next Protocol in IPv4/IPv6 header. */
784 m_copyback(m, protoff, sizeof(u_int8_t), (u_char *) &prot);
786 /* Get crypto descriptors. */
787 crp = crypto_getreq(esph && espx ? 2 : 1);
789 DPRINTF(("esp_output: failed to acquire crypto descriptors\n"));
790 espstat.esps_crypto++;
796 crde = crp->crp_desc;
797 crda = crde->crd_next;
799 /* Encryption descriptor. */
800 crde->crd_skip = skip + hlen;
801 crde->crd_len = m->m_pkthdr.len - (skip + hlen + alen);
802 crde->crd_flags = CRD_F_ENCRYPT;
803 crde->crd_inject = skip + hlen - sav->ivlen;
805 /* Encryption operation. */
806 crde->crd_alg = espx->type;
807 crde->crd_key = _KEYBUF(sav->key_enc);
808 crde->crd_klen = _KEYBITS(sav->key_enc);
811 crda = crp->crp_desc;
813 /* IPsec-specific opaque crypto info. */
814 tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
815 M_XDATA, M_NOWAIT|M_ZERO);
818 DPRINTF(("esp_output: failed to allocate tdb_crypto\n"));
819 espstat.esps_crypto++;
824 /* Callback parameters */
826 tc->tc_spi = sav->spi;
827 tc->tc_dst = saidx->dst;
828 tc->tc_proto = saidx->proto;
830 /* Crypto operation descriptor. */
831 crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
832 crp->crp_flags = CRYPTO_F_IMBUF;
833 crp->crp_buf = (caddr_t) m;
834 crp->crp_callback = esp_output_cb;
835 crp->crp_opaque = (caddr_t) tc;
836 crp->crp_sid = sav->tdb_cryptoid;
839 /* Authentication descriptor. */
840 crda->crd_skip = skip;
841 crda->crd_len = m->m_pkthdr.len - (skip + alen);
842 crda->crd_inject = m->m_pkthdr.len - alen;
844 /* Authentication operation. */
845 crda->crd_alg = esph->type;
846 crda->crd_key = _KEYBUF(sav->key_auth);
847 crda->crd_klen = _KEYBITS(sav->key_auth);
850 return crypto_dispatch(crp);
858 * ESP output callback from the crypto driver.
861 esp_output_cb(struct cryptop *crp)
863 struct tdb_crypto *tc;
864 struct ipsecrequest *isr;
865 struct secasvar *sav;
869 tc = (struct tdb_crypto *) crp->crp_opaque;
870 KASSERT(tc != NULL, ("esp_output_cb: null opaque data area!"));
871 m = (struct mbuf *) crp->crp_buf;
876 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
878 espstat.esps_notdb++;
879 DPRINTF(("esp_output_cb: SA expired while in crypto "
880 "(SA %s/%08lx proto %u)\n", ipsec_address(&tc->tc_dst),
881 (u_long) ntohl(tc->tc_spi), tc->tc_proto));
882 error = ENOBUFS; /*XXX*/
885 KASSERT(isr->sav == sav,
886 ("esp_output_cb: SA changed was %p now %p\n", isr->sav, sav));
888 /* Check for crypto errors. */
889 if (crp->crp_etype) {
890 /* Reset session ID. */
891 if (sav->tdb_cryptoid != 0)
892 sav->tdb_cryptoid = crp->crp_sid;
894 if (crp->crp_etype == EAGAIN) {
897 return crypto_dispatch(crp);
900 espstat.esps_noxform++;
901 DPRINTF(("esp_output_cb: crypto error %d\n", crp->crp_etype));
902 error = crp->crp_etype;
906 /* Shouldn't happen... */
908 espstat.esps_crypto++;
909 DPRINTF(("esp_output_cb: bogus returned buffer from crypto\n"));
913 espstat.esps_hist[sav->alg_enc]++;
914 if (sav->tdb_authalgxform != NULL)
915 ahstat.ahs_hist[sav->alg_auth]++;
917 /* Release crypto descriptors. */
921 /* NB: m is reclaimed by ipsec_process_done. */
922 err = ipsec_process_done(m, isr);
937 static struct xformsw esp_xformsw = {
938 XF_ESP, XFT_CONF|XFT_AUTH, "IPsec ESP",
939 esp_init, esp_zeroize, esp_input,
946 #define MAXIV(xform) \
947 if (xform.blocksize > esp_max_ivlen) \
948 esp_max_ivlen = xform.blocksize \
951 MAXIV(enc_xform_des); /* SADB_EALG_DESCBC */
952 MAXIV(enc_xform_3des); /* SADB_EALG_3DESCBC */
953 MAXIV(enc_xform_rijndael128); /* SADB_X_EALG_AES */
954 MAXIV(enc_xform_blf); /* SADB_X_EALG_BLOWFISHCBC */
955 MAXIV(enc_xform_cast5); /* SADB_X_EALG_CAST128CBC */
956 MAXIV(enc_xform_skipjack); /* SADB_X_EALG_SKIPJACK */
957 MAXIV(enc_xform_null); /* SADB_EALG_NULL */
959 xform_register(&esp_xformsw);
962 SYSINIT(esp_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, esp_attach, NULL)