xref: /freebsd/sys/netipsec/xform_esp.c (revision 0c80e7df436b13daaa144f1228c8de445740822f)
188768458SSam Leffler /*	$FreeBSD$	*/
288768458SSam Leffler /*	$OpenBSD: ip_esp.c,v 1.69 2001/06/26 06:18:59 angelos Exp $ */
3c398230bSWarner Losh /*-
488768458SSam Leffler  * The authors of this code are John Ioannidis (ji@tla.org),
588768458SSam Leffler  * Angelos D. Keromytis (kermit@csd.uch.gr) and
688768458SSam Leffler  * Niels Provos (provos@physnet.uni-hamburg.de).
788768458SSam Leffler  *
888768458SSam Leffler  * The original version of this code was written by John Ioannidis
988768458SSam Leffler  * for BSD/OS in Athens, Greece, in November 1995.
1088768458SSam Leffler  *
1188768458SSam Leffler  * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
1288768458SSam Leffler  * by Angelos D. Keromytis.
1388768458SSam Leffler  *
1488768458SSam Leffler  * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
1588768458SSam Leffler  * and Niels Provos.
1688768458SSam Leffler  *
1788768458SSam Leffler  * Additional features in 1999 by Angelos D. Keromytis.
1888768458SSam Leffler  *
1988768458SSam Leffler  * Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
2088768458SSam Leffler  * Angelos D. Keromytis and Niels Provos.
2188768458SSam Leffler  * Copyright (c) 2001 Angelos D. Keromytis.
2288768458SSam Leffler  *
2388768458SSam Leffler  * Permission to use, copy, and modify this software with or without fee
2488768458SSam Leffler  * is hereby granted, provided that this entire notice is included in
2588768458SSam Leffler  * all copies of any software which is or includes a copy or
2688768458SSam Leffler  * modification of this software.
2788768458SSam Leffler  * You may use this code under the GNU public license if you so wish. Please
2888768458SSam Leffler  * contribute changes back to the authors under this freer than GPL license
2988768458SSam Leffler  * so that we may further the use of strong encryption without limitations to
3088768458SSam Leffler  * all.
3188768458SSam Leffler  *
3288768458SSam Leffler  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
3388768458SSam Leffler  * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
3488768458SSam Leffler  * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
3588768458SSam Leffler  * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
3688768458SSam Leffler  * PURPOSE.
3788768458SSam Leffler  */
3888768458SSam Leffler #include "opt_inet.h"
3988768458SSam Leffler #include "opt_inet6.h"
4088768458SSam Leffler 
4188768458SSam Leffler #include <sys/param.h>
4288768458SSam Leffler #include <sys/systm.h>
4388768458SSam Leffler #include <sys/mbuf.h>
4488768458SSam Leffler #include <sys/socket.h>
4588768458SSam Leffler #include <sys/syslog.h>
4688768458SSam Leffler #include <sys/kernel.h>
47eedc7fd9SGleb Smirnoff #include <sys/lock.h>
4888768458SSam Leffler #include <sys/random.h>
49eedc7fd9SGleb Smirnoff #include <sys/rwlock.h>
5088768458SSam Leffler #include <sys/sysctl.h>
51a2bc81bfSJohn-Mark Gurney #include <sys/mutex.h>
52a2bc81bfSJohn-Mark Gurney #include <machine/atomic.h>
5388768458SSam Leffler 
5488768458SSam Leffler #include <net/if.h>
55eddfbb76SRobert Watson #include <net/vnet.h>
5688768458SSam Leffler 
5788768458SSam Leffler #include <netinet/in.h>
5888768458SSam Leffler #include <netinet/in_systm.h>
5988768458SSam Leffler #include <netinet/ip.h>
6088768458SSam Leffler #include <netinet/ip_ecn.h>
6188768458SSam Leffler #include <netinet/ip6.h>
6288768458SSam Leffler 
6388768458SSam Leffler #include <netipsec/ipsec.h>
6488768458SSam Leffler #include <netipsec/ah.h>
6588768458SSam Leffler #include <netipsec/ah_var.h>
6688768458SSam Leffler #include <netipsec/esp.h>
6788768458SSam Leffler #include <netipsec/esp_var.h>
6888768458SSam Leffler #include <netipsec/xform.h>
6988768458SSam Leffler 
7088768458SSam Leffler #ifdef INET6
7188768458SSam Leffler #include <netinet6/ip6_var.h>
7288768458SSam Leffler #include <netipsec/ipsec6.h>
7388768458SSam Leffler #include <netinet6/ip6_ecn.h>
7488768458SSam Leffler #endif
7588768458SSam Leffler 
7688768458SSam Leffler #include <netipsec/key.h>
7788768458SSam Leffler #include <netipsec/key_debug.h>
7888768458SSam Leffler 
7988768458SSam Leffler #include <opencrypto/cryptodev.h>
8088768458SSam Leffler #include <opencrypto/xform.h>
8188768458SSam Leffler 
82eddfbb76SRobert Watson VNET_DEFINE(int, esp_enable) = 1;
83db8c0879SAndrey V. Elsukov VNET_PCPUSTAT_DEFINE(struct espstat, espstat);
84db8c0879SAndrey V. Elsukov VNET_PCPUSTAT_SYSINIT(espstat);
85db8c0879SAndrey V. Elsukov 
86db8c0879SAndrey V. Elsukov #ifdef VIMAGE
87db8c0879SAndrey V. Elsukov VNET_PCPUSTAT_SYSUNINIT(espstat);
88db8c0879SAndrey V. Elsukov #endif /* VIMAGE */
8988768458SSam Leffler 
9088768458SSam Leffler SYSCTL_DECL(_net_inet_esp);
916df8a710SGleb Smirnoff SYSCTL_INT(_net_inet_esp, OID_AUTO, esp_enable,
926df8a710SGleb Smirnoff 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(esp_enable), 0, "");
93db8c0879SAndrey V. Elsukov SYSCTL_VNET_PCPUSTAT(_net_inet_esp, IPSECCTL_STATS, stats,
94db8c0879SAndrey V. Elsukov     struct espstat, espstat,
95db8c0879SAndrey V. Elsukov     "ESP statistics (struct espstat, netipsec/esp_var.h");
96eddfbb76SRobert Watson 
9788768458SSam Leffler static int esp_input_cb(struct cryptop *op);
9888768458SSam Leffler static int esp_output_cb(struct cryptop *crp);
99bfe1aba4SMarko Zec 
10088768458SSam Leffler /*
10188768458SSam Leffler  * NB: this is public for use by the PF_KEY support.
10288768458SSam Leffler  * NB: if you add support here; be sure to add code to esp_attach below!
10388768458SSam Leffler  */
10488768458SSam Leffler struct enc_xform *
10588768458SSam Leffler esp_algorithm_lookup(int alg)
10688768458SSam Leffler {
10788768458SSam Leffler 	if (alg >= ESP_ALG_MAX)
10888768458SSam Leffler 		return NULL;
10988768458SSam Leffler 	switch (alg) {
11088768458SSam Leffler 	case SADB_EALG_DESCBC:
11188768458SSam Leffler 		return &enc_xform_des;
11288768458SSam Leffler 	case SADB_EALG_3DESCBC:
11388768458SSam Leffler 		return &enc_xform_3des;
11488768458SSam Leffler 	case SADB_X_EALG_AES:
11588768458SSam Leffler 		return &enc_xform_rijndael128;
11688768458SSam Leffler 	case SADB_X_EALG_BLOWFISHCBC:
11788768458SSam Leffler 		return &enc_xform_blf;
11888768458SSam Leffler 	case SADB_X_EALG_CAST128CBC:
11988768458SSam Leffler 		return &enc_xform_cast5;
12088768458SSam Leffler 	case SADB_EALG_NULL:
12188768458SSam Leffler 		return &enc_xform_null;
122559d3390SGeorge V. Neville-Neil 	case SADB_X_EALG_CAMELLIACBC:
123559d3390SGeorge V. Neville-Neil 		return &enc_xform_camellia;
12416de9ac1SGeorge V. Neville-Neil 	case SADB_X_EALG_AESCTR:
12516de9ac1SGeorge V. Neville-Neil 		return &enc_xform_aes_icm;
12616de9ac1SGeorge V. Neville-Neil 	case SADB_X_EALG_AESGCM16:
12716de9ac1SGeorge V. Neville-Neil 		return &enc_xform_aes_nist_gcm;
12816de9ac1SGeorge V. Neville-Neil 	case SADB_X_EALG_AESGMAC:
12916de9ac1SGeorge V. Neville-Neil 		return &enc_xform_aes_nist_gmac;
13088768458SSam Leffler 	}
13188768458SSam Leffler 	return NULL;
13288768458SSam Leffler }
13388768458SSam Leffler 
13488768458SSam Leffler size_t
13588768458SSam Leffler esp_hdrsiz(struct secasvar *sav)
13688768458SSam Leffler {
13788768458SSam Leffler 	size_t size;
13888768458SSam Leffler 
13988768458SSam Leffler 	if (sav != NULL) {
14088768458SSam Leffler 		/*XXX not right for null algorithm--does it matter??*/
1419ffa9677SSam Leffler 		IPSEC_ASSERT(sav->tdb_encalgxform != NULL,
1429ffa9677SSam Leffler 			("SA with null xform"));
14388768458SSam Leffler 		if (sav->flags & SADB_X_EXT_OLD)
14488768458SSam Leffler 			size = sizeof (struct esp);
14588768458SSam Leffler 		else
14688768458SSam Leffler 			size = sizeof (struct newesp);
14788768458SSam Leffler 		size += sav->tdb_encalgxform->blocksize + 9;
14888768458SSam Leffler 		/*XXX need alg check???*/
14988768458SSam Leffler 		if (sav->tdb_authalgxform != NULL && sav->replay)
15088768458SSam Leffler 			size += ah_hdrsiz(sav);
15188768458SSam Leffler 	} else {
15288768458SSam Leffler 		/*
15388768458SSam Leffler 		 *   base header size
15488768458SSam Leffler 		 * + max iv length for CBC mode
15588768458SSam Leffler 		 * + max pad length
15688768458SSam Leffler 		 * + sizeof (pad length field)
15788768458SSam Leffler 		 * + sizeof (next header field)
15888768458SSam Leffler 		 * + max icv supported.
15988768458SSam Leffler 		 */
160cdb7ebe3SPawel Jakub Dawidek 		size = sizeof (struct newesp) + EALG_MAX_BLOCK_LEN + 9 + 16;
16188768458SSam Leffler 	}
16288768458SSam Leffler 	return size;
16388768458SSam Leffler }
16488768458SSam Leffler 
16588768458SSam Leffler /*
16688768458SSam Leffler  * esp_init() is called when an SPI is being set up.
16788768458SSam Leffler  */
16888768458SSam Leffler static int
16988768458SSam Leffler esp_init(struct secasvar *sav, struct xformsw *xsp)
17088768458SSam Leffler {
17188768458SSam Leffler 	struct enc_xform *txform;
17288768458SSam Leffler 	struct cryptoini cria, crie;
17388768458SSam Leffler 	int keylen;
17488768458SSam Leffler 	int error;
17588768458SSam Leffler 
17688768458SSam Leffler 	txform = esp_algorithm_lookup(sav->alg_enc);
17788768458SSam Leffler 	if (txform == NULL) {
1789ffa9677SSam Leffler 		DPRINTF(("%s: unsupported encryption algorithm %d\n",
1799ffa9677SSam Leffler 			__func__, sav->alg_enc));
18088768458SSam Leffler 		return EINVAL;
18188768458SSam Leffler 	}
18288768458SSam Leffler 	if (sav->key_enc == NULL) {
1839ffa9677SSam Leffler 		DPRINTF(("%s: no encoding key for %s algorithm\n",
1849ffa9677SSam Leffler 			 __func__, txform->name));
18588768458SSam Leffler 		return EINVAL;
18688768458SSam Leffler 	}
187a2bc81bfSJohn-Mark Gurney 	if ((sav->flags & (SADB_X_EXT_OLD | SADB_X_EXT_IV4B)) ==
188a2bc81bfSJohn-Mark Gurney 	    SADB_X_EXT_IV4B) {
1899ffa9677SSam Leffler 		DPRINTF(("%s: 4-byte IV not supported with protocol\n",
1909ffa9677SSam Leffler 			__func__));
19188768458SSam Leffler 		return EINVAL;
19288768458SSam Leffler 	}
193a2bc81bfSJohn-Mark Gurney 	/* subtract off the salt, RFC4106, 8.1 and RFC3686, 5.1 */
194a2bc81bfSJohn-Mark Gurney 	keylen = _KEYLEN(sav->key_enc) - SAV_ISCTRORGCM(sav) * 4;
19588768458SSam Leffler 	if (txform->minkey > keylen || keylen > txform->maxkey) {
1969ffa9677SSam Leffler 		DPRINTF(("%s: invalid key length %u, must be in the range "
1979ffa9677SSam Leffler 			"[%u..%u] for algorithm %s\n", __func__,
19888768458SSam Leffler 			keylen, txform->minkey, txform->maxkey,
19988768458SSam Leffler 			txform->name));
20088768458SSam Leffler 		return EINVAL;
20188768458SSam Leffler 	}
20288768458SSam Leffler 
203a2bc81bfSJohn-Mark Gurney 	if (SAV_ISCTRORGCM(sav))
204a2bc81bfSJohn-Mark Gurney 		sav->ivlen = 8;	/* RFC4106 3.1 and RFC3686 3.1 */
205a2bc81bfSJohn-Mark Gurney 	else
206*0c80e7dfSAndrey V. Elsukov 		sav->ivlen = txform->ivsize;
20788768458SSam Leffler 
20888768458SSam Leffler 	/*
20988768458SSam Leffler 	 * Setup AH-related state.
21088768458SSam Leffler 	 */
21188768458SSam Leffler 	if (sav->alg_auth != 0) {
21288768458SSam Leffler 		error = ah_init0(sav, xsp, &cria);
21388768458SSam Leffler 		if (error)
21488768458SSam Leffler 			return error;
21588768458SSam Leffler 	}
21688768458SSam Leffler 
21788768458SSam Leffler 	/* NB: override anything set in ah_init0 */
21888768458SSam Leffler 	sav->tdb_xform = xsp;
21988768458SSam Leffler 	sav->tdb_encalgxform = txform;
22088768458SSam Leffler 
22116de9ac1SGeorge V. Neville-Neil 	/*
22216de9ac1SGeorge V. Neville-Neil 	 * Whenever AES-GCM is used for encryption, one
22316de9ac1SGeorge V. Neville-Neil 	 * of the AES authentication algorithms is chosen
22416de9ac1SGeorge V. Neville-Neil 	 * as well, based on the key size.
22516de9ac1SGeorge V. Neville-Neil 	 */
22616de9ac1SGeorge V. Neville-Neil 	if (sav->alg_enc == SADB_X_EALG_AESGCM16) {
22716de9ac1SGeorge V. Neville-Neil 		switch (keylen) {
228a2bc81bfSJohn-Mark Gurney 		case AES_128_GMAC_KEY_LEN:
22916de9ac1SGeorge V. Neville-Neil 			sav->alg_auth = SADB_X_AALG_AES128GMAC;
23016de9ac1SGeorge V. Neville-Neil 			sav->tdb_authalgxform = &auth_hash_nist_gmac_aes_128;
23116de9ac1SGeorge V. Neville-Neil 			break;
232a2bc81bfSJohn-Mark Gurney 		case AES_192_GMAC_KEY_LEN:
23316de9ac1SGeorge V. Neville-Neil 			sav->alg_auth = SADB_X_AALG_AES192GMAC;
23416de9ac1SGeorge V. Neville-Neil 			sav->tdb_authalgxform = &auth_hash_nist_gmac_aes_192;
23516de9ac1SGeorge V. Neville-Neil 			break;
236a2bc81bfSJohn-Mark Gurney 		case AES_256_GMAC_KEY_LEN:
23716de9ac1SGeorge V. Neville-Neil 			sav->alg_auth = SADB_X_AALG_AES256GMAC;
23816de9ac1SGeorge V. Neville-Neil 			sav->tdb_authalgxform = &auth_hash_nist_gmac_aes_256;
23916de9ac1SGeorge V. Neville-Neil 			break;
24016de9ac1SGeorge V. Neville-Neil 		default:
24116de9ac1SGeorge V. Neville-Neil 			DPRINTF(("%s: invalid key length %u"
24216de9ac1SGeorge V. Neville-Neil 				 "for algorithm %s\n", __func__,
24316de9ac1SGeorge V. Neville-Neil 				 keylen, txform->name));
24416de9ac1SGeorge V. Neville-Neil 			return EINVAL;
24516de9ac1SGeorge V. Neville-Neil 		}
24616de9ac1SGeorge V. Neville-Neil 		bzero(&cria, sizeof(cria));
24716de9ac1SGeorge V. Neville-Neil 		cria.cri_alg = sav->tdb_authalgxform->type;
24816de9ac1SGeorge V. Neville-Neil 		cria.cri_key = sav->key_enc->key_data;
249a2bc81bfSJohn-Mark Gurney 		cria.cri_klen = _KEYBITS(sav->key_enc) - SAV_ISGCM(sav) * 32;
25016de9ac1SGeorge V. Neville-Neil 	}
25116de9ac1SGeorge V. Neville-Neil 
25288768458SSam Leffler 	/* Initialize crypto session. */
25388768458SSam Leffler 	bzero(&crie, sizeof(crie));
25488768458SSam Leffler 	crie.cri_alg = sav->tdb_encalgxform->type;
255a0196c3cSGeorge V. Neville-Neil 	crie.cri_key = sav->key_enc->key_data;
256a2bc81bfSJohn-Mark Gurney 	crie.cri_klen = _KEYBITS(sav->key_enc) - SAV_ISCTRORGCM(sav) * 32;
25788768458SSam Leffler 
25888768458SSam Leffler 	if (sav->tdb_authalgxform && sav->tdb_encalgxform) {
25988768458SSam Leffler 		/* init both auth & enc */
26088768458SSam Leffler 		crie.cri_next = &cria;
26188768458SSam Leffler 		error = crypto_newsession(&sav->tdb_cryptoid,
262603724d3SBjoern A. Zeeb 					  &crie, V_crypto_support);
26388768458SSam Leffler 	} else if (sav->tdb_encalgxform) {
26488768458SSam Leffler 		error = crypto_newsession(&sav->tdb_cryptoid,
265603724d3SBjoern A. Zeeb 					  &crie, V_crypto_support);
26688768458SSam Leffler 	} else if (sav->tdb_authalgxform) {
26788768458SSam Leffler 		error = crypto_newsession(&sav->tdb_cryptoid,
268603724d3SBjoern A. Zeeb 					  &cria, V_crypto_support);
26988768458SSam Leffler 	} else {
27088768458SSam Leffler 		/* XXX cannot happen? */
2719ffa9677SSam Leffler 		DPRINTF(("%s: no encoding OR authentication xform!\n",
2729ffa9677SSam Leffler 			__func__));
27388768458SSam Leffler 		error = EINVAL;
27488768458SSam Leffler 	}
27588768458SSam Leffler 	return error;
27688768458SSam Leffler }
27788768458SSam Leffler 
27888768458SSam Leffler /*
27988768458SSam Leffler  * Paranoia.
28088768458SSam Leffler  */
28188768458SSam Leffler static int
28288768458SSam Leffler esp_zeroize(struct secasvar *sav)
28388768458SSam Leffler {
28488768458SSam Leffler 	/* NB: ah_zerorize free's the crypto session state */
28588768458SSam Leffler 	int error = ah_zeroize(sav);
28688768458SSam Leffler 
28788768458SSam Leffler 	if (sav->key_enc)
288a0196c3cSGeorge V. Neville-Neil 		bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc));
28988768458SSam Leffler 	sav->tdb_encalgxform = NULL;
29088768458SSam Leffler 	sav->tdb_xform = NULL;
29188768458SSam Leffler 	return error;
29288768458SSam Leffler }
29388768458SSam Leffler 
29488768458SSam Leffler /*
29588768458SSam Leffler  * ESP input processing, called (eventually) through the protocol switch.
29688768458SSam Leffler  */
29788768458SSam Leffler static int
29888768458SSam Leffler esp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
29988768458SSam Leffler {
300962ac6c7SAndrey V. Elsukov 	char buf[128];
30188768458SSam Leffler 	struct auth_hash *esph;
30288768458SSam Leffler 	struct enc_xform *espx;
30388768458SSam Leffler 	struct tdb_crypto *tc;
304a2bc81bfSJohn-Mark Gurney 	uint8_t *ivp;
30588768458SSam Leffler 	int plen, alen, hlen;
30688768458SSam Leffler 	struct newesp *esp;
30788768458SSam Leffler 	struct cryptodesc *crde;
30888768458SSam Leffler 	struct cryptop *crp;
30988768458SSam Leffler 
3109ffa9677SSam Leffler 	IPSEC_ASSERT(sav != NULL, ("null SA"));
3119ffa9677SSam Leffler 	IPSEC_ASSERT(sav->tdb_encalgxform != NULL, ("null encoding xform"));
312a45bff04SVANHULLEBUS Yvan 
313a45bff04SVANHULLEBUS Yvan 	/* Valid IP Packet length ? */
314a45bff04SVANHULLEBUS Yvan 	if ( (skip&3) || (m->m_pkthdr.len&3) ){
315a45bff04SVANHULLEBUS Yvan 		DPRINTF(("%s: misaligned packet, skip %u pkt len %u",
316a45bff04SVANHULLEBUS Yvan 				__func__, skip, m->m_pkthdr.len));
317a04d64d8SAndrey V. Elsukov 		ESPSTAT_INC(esps_badilen);
318a45bff04SVANHULLEBUS Yvan 		m_freem(m);
319a45bff04SVANHULLEBUS Yvan 		return EINVAL;
320a45bff04SVANHULLEBUS Yvan 	}
32188768458SSam Leffler 	/* XXX don't pullup, just copy header */
32288768458SSam Leffler 	IP6_EXTHDR_GET(esp, struct newesp *, m, skip, sizeof (struct newesp));
32388768458SSam Leffler 
32488768458SSam Leffler 	esph = sav->tdb_authalgxform;
32588768458SSam Leffler 	espx = sav->tdb_encalgxform;
32688768458SSam Leffler 
327a09a7146SJohn-Mark Gurney 	/* Determine the ESP header and auth length */
32888768458SSam Leffler 	if (sav->flags & SADB_X_EXT_OLD)
32988768458SSam Leffler 		hlen = sizeof (struct esp) + sav->ivlen;
33088768458SSam Leffler 	else
33188768458SSam Leffler 		hlen = sizeof (struct newesp) + sav->ivlen;
332a09a7146SJohn-Mark Gurney 
333a09a7146SJohn-Mark Gurney 	alen = xform_ah_authsize(esph);
33488768458SSam Leffler 
33588768458SSam Leffler 	/*
33688768458SSam Leffler 	 * Verify payload length is multiple of encryption algorithm
33788768458SSam Leffler 	 * block size.
33888768458SSam Leffler 	 *
33988768458SSam Leffler 	 * NB: This works for the null algorithm because the blocksize
34088768458SSam Leffler 	 *     is 4 and all packets must be 4-byte aligned regardless
34188768458SSam Leffler 	 *     of the algorithm.
34288768458SSam Leffler 	 */
34388768458SSam Leffler 	plen = m->m_pkthdr.len - (skip + hlen + alen);
34488768458SSam Leffler 	if ((plen & (espx->blocksize - 1)) || (plen <= 0)) {
3459ffa9677SSam Leffler 		DPRINTF(("%s: payload of %d octets not a multiple of %d octets,"
346a2bc81bfSJohn-Mark Gurney 		    "  SA %s/%08lx\n", __func__, plen, espx->blocksize,
347a2bc81bfSJohn-Mark Gurney 		    ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
348a2bc81bfSJohn-Mark Gurney 		    (u_long)ntohl(sav->spi)));
349a04d64d8SAndrey V. Elsukov 		ESPSTAT_INC(esps_badilen);
35088768458SSam Leffler 		m_freem(m);
35188768458SSam Leffler 		return EINVAL;
35288768458SSam Leffler 	}
35388768458SSam Leffler 
35488768458SSam Leffler 	/*
35588768458SSam Leffler 	 * Check sequence number.
35688768458SSam Leffler 	 */
35708537f45SAndrey V. Elsukov 	if (esph != NULL && sav->replay != NULL &&
35808537f45SAndrey V. Elsukov 	    !ipsec_chkreplay(ntohl(esp->esp_seq), sav)) {
3599ffa9677SSam Leffler 		DPRINTF(("%s: packet replay check for %s\n", __func__,
360962ac6c7SAndrey V. Elsukov 		    ipsec_logsastr(sav, buf, sizeof(buf))));	/*XXX*/
361a04d64d8SAndrey V. Elsukov 		ESPSTAT_INC(esps_replay);
36288768458SSam Leffler 		m_freem(m);
36388768458SSam Leffler 		return ENOBUFS;		/*XXX*/
36488768458SSam Leffler 	}
36588768458SSam Leffler 
36688768458SSam Leffler 	/* Update the counters */
367a04d64d8SAndrey V. Elsukov 	ESPSTAT_ADD(esps_ibytes, m->m_pkthdr.len - (skip + hlen + alen));
36888768458SSam Leffler 
36988768458SSam Leffler 	/* Get crypto descriptors */
37088768458SSam Leffler 	crp = crypto_getreq(esph && espx ? 2 : 1);
37188768458SSam Leffler 	if (crp == NULL) {
3729ffa9677SSam Leffler 		DPRINTF(("%s: failed to acquire crypto descriptors\n",
3739ffa9677SSam Leffler 			__func__));
374a04d64d8SAndrey V. Elsukov 		ESPSTAT_INC(esps_crypto);
37588768458SSam Leffler 		m_freem(m);
37688768458SSam Leffler 		return ENOBUFS;
37788768458SSam Leffler 	}
37888768458SSam Leffler 
37988768458SSam Leffler 	/* Get IPsec-specific opaque pointer */
38088768458SSam Leffler 	tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto) + alen,
38188768458SSam Leffler 	    M_XDATA, M_NOWAIT | M_ZERO);
38288768458SSam Leffler 	if (tc == NULL) {
38388768458SSam Leffler 		crypto_freereq(crp);
3849ffa9677SSam Leffler 		DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
385a04d64d8SAndrey V. Elsukov 		ESPSTAT_INC(esps_crypto);
38688768458SSam Leffler 		m_freem(m);
38788768458SSam Leffler 		return ENOBUFS;
38888768458SSam Leffler 	}
38988768458SSam Leffler 
39008537f45SAndrey V. Elsukov 	if (esph != NULL) {
39188768458SSam Leffler 		struct cryptodesc *crda = crp->crp_desc;
39288768458SSam Leffler 
3939ffa9677SSam Leffler 		IPSEC_ASSERT(crda != NULL, ("null ah crypto descriptor"));
39488768458SSam Leffler 
39588768458SSam Leffler 		/* Authentication descriptor */
39688768458SSam Leffler 		crda->crd_skip = skip;
397a2bc81bfSJohn-Mark Gurney 		if (SAV_ISGCM(sav))
398a2bc81bfSJohn-Mark Gurney 			crda->crd_len = 8;	/* RFC4106 5, SPI + SN */
39916de9ac1SGeorge V. Neville-Neil 		else
40088768458SSam Leffler 			crda->crd_len = m->m_pkthdr.len - (skip + alen);
40188768458SSam Leffler 		crda->crd_inject = m->m_pkthdr.len - alen;
40288768458SSam Leffler 
40388768458SSam Leffler 		crda->crd_alg = esph->type;
40488768458SSam Leffler 
40588768458SSam Leffler 		/* Copy the authenticator */
40688768458SSam Leffler 		m_copydata(m, m->m_pkthdr.len - alen, alen,
40788768458SSam Leffler 		    (caddr_t) (tc + 1));
40888768458SSam Leffler 
40988768458SSam Leffler 		/* Chain authentication request */
41088768458SSam Leffler 		crde = crda->crd_next;
41188768458SSam Leffler 	} else {
41288768458SSam Leffler 		crde = crp->crp_desc;
41388768458SSam Leffler 	}
41488768458SSam Leffler 
41588768458SSam Leffler 	/* Crypto operation descriptor */
41688768458SSam Leffler 	crp->crp_ilen = m->m_pkthdr.len; /* Total input length */
417d8409aafSSam Leffler 	crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
41888768458SSam Leffler 	crp->crp_buf = (caddr_t) m;
41988768458SSam Leffler 	crp->crp_callback = esp_input_cb;
42088768458SSam Leffler 	crp->crp_sid = sav->tdb_cryptoid;
42188768458SSam Leffler 	crp->crp_opaque = (caddr_t) tc;
42288768458SSam Leffler 
42388768458SSam Leffler 	/* These are passed as-is to the callback */
42488768458SSam Leffler 	tc->tc_spi = sav->spi;
42588768458SSam Leffler 	tc->tc_dst = sav->sah->saidx.dst;
42688768458SSam Leffler 	tc->tc_proto = sav->sah->saidx.proto;
42788768458SSam Leffler 	tc->tc_protoff = protoff;
42888768458SSam Leffler 	tc->tc_skip = skip;
42973171433SFabien Thomas 	KEY_ADDREFSA(sav);
43073171433SFabien Thomas 	tc->tc_sav = sav;
43188768458SSam Leffler 
43288768458SSam Leffler 	/* Decryption descriptor */
4339ffa9677SSam Leffler 	IPSEC_ASSERT(crde != NULL, ("null esp crypto descriptor"));
43488768458SSam Leffler 	crde->crd_skip = skip + hlen;
43588768458SSam Leffler 	crde->crd_len = m->m_pkthdr.len - (skip + hlen + alen);
43688768458SSam Leffler 	crde->crd_inject = skip + hlen - sav->ivlen;
43788768458SSam Leffler 
438a2bc81bfSJohn-Mark Gurney 	if (SAV_ISCTRORGCM(sav)) {
439a2bc81bfSJohn-Mark Gurney 		ivp = &crde->crd_iv[0];
44016de9ac1SGeorge V. Neville-Neil 
441a2bc81bfSJohn-Mark Gurney 		/* GCM IV Format: RFC4106 4 */
442a2bc81bfSJohn-Mark Gurney 		/* CTR IV Format: RFC3686 4 */
443a2bc81bfSJohn-Mark Gurney 		/* Salt is last four bytes of key, RFC4106 8.1 */
444a2bc81bfSJohn-Mark Gurney 		/* Nonce is last four bytes of key, RFC3686 5.1 */
445a2bc81bfSJohn-Mark Gurney 		memcpy(ivp, sav->key_enc->key_data +
446a2bc81bfSJohn-Mark Gurney 		    _KEYLEN(sav->key_enc) - 4, 4);
447a2bc81bfSJohn-Mark Gurney 
448a2bc81bfSJohn-Mark Gurney 		if (SAV_ISCTR(sav)) {
449a2bc81bfSJohn-Mark Gurney 			/* Initial block counter is 1, RFC3686 4 */
450a2bc81bfSJohn-Mark Gurney 			be32enc(&ivp[sav->ivlen + 4], 1);
451a2bc81bfSJohn-Mark Gurney 		}
452a2bc81bfSJohn-Mark Gurney 
453a2bc81bfSJohn-Mark Gurney 		m_copydata(m, skip + hlen - sav->ivlen, sav->ivlen, &ivp[4]);
454a2bc81bfSJohn-Mark Gurney 		crde->crd_flags |= CRD_F_IV_EXPLICIT;
455a2bc81bfSJohn-Mark Gurney 	}
456a2bc81bfSJohn-Mark Gurney 
457a2bc81bfSJohn-Mark Gurney 	crde->crd_alg = espx->type;
45888768458SSam Leffler 
45908537f45SAndrey V. Elsukov 	return (crypto_dispatch(crp));
46088768458SSam Leffler }
46188768458SSam Leffler 
46288768458SSam Leffler /*
46388768458SSam Leffler  * ESP input callback from the crypto driver.
46488768458SSam Leffler  */
46588768458SSam Leffler static int
46688768458SSam Leffler esp_input_cb(struct cryptop *crp)
46788768458SSam Leffler {
468962ac6c7SAndrey V. Elsukov 	char buf[128];
469442da28aSVANHULLEBUS Yvan 	u_int8_t lastthree[3], aalg[AH_HMAC_MAXHASHLEN];
470442da28aSVANHULLEBUS Yvan 	int hlen, skip, protoff, error, alen;
47188768458SSam Leffler 	struct mbuf *m;
47288768458SSam Leffler 	struct cryptodesc *crd;
47388768458SSam Leffler 	struct auth_hash *esph;
47488768458SSam Leffler 	struct enc_xform *espx;
47588768458SSam Leffler 	struct tdb_crypto *tc;
47688768458SSam Leffler 	struct secasvar *sav;
47788768458SSam Leffler 	struct secasindex *saidx;
47888768458SSam Leffler 	caddr_t ptr;
47988768458SSam Leffler 
48088768458SSam Leffler 	crd = crp->crp_desc;
4819ffa9677SSam Leffler 	IPSEC_ASSERT(crd != NULL, ("null crypto descriptor!"));
48288768458SSam Leffler 
48388768458SSam Leffler 	tc = (struct tdb_crypto *) crp->crp_opaque;
4849ffa9677SSam Leffler 	IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!"));
48588768458SSam Leffler 	skip = tc->tc_skip;
48688768458SSam Leffler 	protoff = tc->tc_protoff;
48788768458SSam Leffler 	m = (struct mbuf *) crp->crp_buf;
48888768458SSam Leffler 
48973171433SFabien Thomas 	sav = tc->tc_sav;
49073171433SFabien Thomas 	IPSEC_ASSERT(sav != NULL, ("null SA!"));
49188768458SSam Leffler 
49288768458SSam Leffler 	saidx = &sav->sah->saidx;
4939ffa9677SSam Leffler 	IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
49488768458SSam Leffler 		saidx->dst.sa.sa_family == AF_INET6,
4959ffa9677SSam Leffler 		("unexpected protocol family %u", saidx->dst.sa.sa_family));
49688768458SSam Leffler 
49788768458SSam Leffler 	esph = sav->tdb_authalgxform;
49888768458SSam Leffler 	espx = sav->tdb_encalgxform;
49988768458SSam Leffler 
50088768458SSam Leffler 	/* Check for crypto errors */
50188768458SSam Leffler 	if (crp->crp_etype) {
50288768458SSam Leffler 		/* Reset the session ID */
50388768458SSam Leffler 		if (sav->tdb_cryptoid != 0)
50488768458SSam Leffler 			sav->tdb_cryptoid = crp->crp_sid;
50588768458SSam Leffler 
5060a95a08eSPawel Jakub Dawidek 		if (crp->crp_etype == EAGAIN)
5070a95a08eSPawel Jakub Dawidek 			return (crypto_dispatch(crp));
50888768458SSam Leffler 
509a04d64d8SAndrey V. Elsukov 		ESPSTAT_INC(esps_noxform);
5109ffa9677SSam Leffler 		DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
51188768458SSam Leffler 		error = crp->crp_etype;
51288768458SSam Leffler 		goto bad;
51388768458SSam Leffler 	}
51488768458SSam Leffler 
51588768458SSam Leffler 	/* Shouldn't happen... */
51688768458SSam Leffler 	if (m == NULL) {
517a04d64d8SAndrey V. Elsukov 		ESPSTAT_INC(esps_crypto);
5189ffa9677SSam Leffler 		DPRINTF(("%s: bogus returned buffer from crypto\n", __func__));
51988768458SSam Leffler 		error = EINVAL;
52088768458SSam Leffler 		goto bad;
52188768458SSam Leffler 	}
522a04d64d8SAndrey V. Elsukov 	ESPSTAT_INC(esps_hist[sav->alg_enc]);
52388768458SSam Leffler 
52488768458SSam Leffler 	/* If authentication was performed, check now. */
52588768458SSam Leffler 	if (esph != NULL) {
526a09a7146SJohn-Mark Gurney 		alen = xform_ah_authsize(esph);
527a04d64d8SAndrey V. Elsukov 		AHSTAT_INC(ahs_hist[sav->alg_auth]);
52888768458SSam Leffler 		/* Copy the authenticator from the packet */
52908537f45SAndrey V. Elsukov 		m_copydata(m, m->m_pkthdr.len - alen, alen, aalg);
53088768458SSam Leffler 		ptr = (caddr_t) (tc + 1);
53188768458SSam Leffler 
53288768458SSam Leffler 		/* Verify authenticator */
53342e5fcbfSJohn-Mark Gurney 		if (timingsafe_bcmp(ptr, aalg, alen) != 0) {
53408537f45SAndrey V. Elsukov 			DPRINTF(("%s: authentication hash mismatch for "
53508537f45SAndrey V. Elsukov 			    "packet in SA %s/%08lx\n", __func__,
536962ac6c7SAndrey V. Elsukov 			    ipsec_address(&saidx->dst, buf, sizeof(buf)),
53788768458SSam Leffler 			    (u_long) ntohl(sav->spi)));
538a04d64d8SAndrey V. Elsukov 			ESPSTAT_INC(esps_badauth);
53988768458SSam Leffler 			error = EACCES;
54088768458SSam Leffler 			goto bad;
54188768458SSam Leffler 		}
54288768458SSam Leffler 
54388768458SSam Leffler 		/* Remove trailing authenticator */
544442da28aSVANHULLEBUS Yvan 		m_adj(m, -alen);
54588768458SSam Leffler 	}
54688768458SSam Leffler 
54788768458SSam Leffler 	/* Release the crypto descriptors */
54888768458SSam Leffler 	free(tc, M_XDATA), tc = NULL;
54988768458SSam Leffler 	crypto_freereq(crp), crp = NULL;
55088768458SSam Leffler 
55188768458SSam Leffler 	/*
55288768458SSam Leffler 	 * Packet is now decrypted.
55388768458SSam Leffler 	 */
55488768458SSam Leffler 	m->m_flags |= M_DECRYPTED;
55588768458SSam Leffler 
556d16f6f50SColin Percival 	/*
557d16f6f50SColin Percival 	 * Update replay sequence number, if appropriate.
558d16f6f50SColin Percival 	 */
559d16f6f50SColin Percival 	if (sav->replay) {
560d16f6f50SColin Percival 		u_int32_t seq;
561d16f6f50SColin Percival 
562d16f6f50SColin Percival 		m_copydata(m, skip + offsetof(struct newesp, esp_seq),
563d16f6f50SColin Percival 			   sizeof (seq), (caddr_t) &seq);
564d16f6f50SColin Percival 		if (ipsec_updatereplay(ntohl(seq), sav)) {
565d16f6f50SColin Percival 			DPRINTF(("%s: packet replay check for %s\n", __func__,
566962ac6c7SAndrey V. Elsukov 			    ipsec_logsastr(sav, buf, sizeof(buf))));
567a04d64d8SAndrey V. Elsukov 			ESPSTAT_INC(esps_replay);
568d16f6f50SColin Percival 			error = ENOBUFS;
569d16f6f50SColin Percival 			goto bad;
570d16f6f50SColin Percival 		}
571d16f6f50SColin Percival 	}
572d16f6f50SColin Percival 
57388768458SSam Leffler 	/* Determine the ESP header length */
57488768458SSam Leffler 	if (sav->flags & SADB_X_EXT_OLD)
57588768458SSam Leffler 		hlen = sizeof (struct esp) + sav->ivlen;
57688768458SSam Leffler 	else
57788768458SSam Leffler 		hlen = sizeof (struct newesp) + sav->ivlen;
57888768458SSam Leffler 
57988768458SSam Leffler 	/* Remove the ESP header and IV from the mbuf. */
58088768458SSam Leffler 	error = m_striphdr(m, skip, hlen);
58188768458SSam Leffler 	if (error) {
582a04d64d8SAndrey V. Elsukov 		ESPSTAT_INC(esps_hdrops);
5839ffa9677SSam Leffler 		DPRINTF(("%s: bad mbuf chain, SA %s/%08lx\n", __func__,
584962ac6c7SAndrey V. Elsukov 		    ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
58588768458SSam Leffler 		    (u_long) ntohl(sav->spi)));
58688768458SSam Leffler 		goto bad;
58788768458SSam Leffler 	}
58888768458SSam Leffler 
58988768458SSam Leffler 	/* Save the last three bytes of decrypted data */
59088768458SSam Leffler 	m_copydata(m, m->m_pkthdr.len - 3, 3, lastthree);
59188768458SSam Leffler 
59288768458SSam Leffler 	/* Verify pad length */
59388768458SSam Leffler 	if (lastthree[1] + 2 > m->m_pkthdr.len - skip) {
594a04d64d8SAndrey V. Elsukov 		ESPSTAT_INC(esps_badilen);
5959ffa9677SSam Leffler 		DPRINTF(("%s: invalid padding length %d for %u byte packet "
596962ac6c7SAndrey V. Elsukov 		    "in SA %s/%08lx\n", __func__, lastthree[1],
597962ac6c7SAndrey V. Elsukov 		    m->m_pkthdr.len - skip,
598962ac6c7SAndrey V. Elsukov 		    ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
59988768458SSam Leffler 		    (u_long) ntohl(sav->spi)));
60088768458SSam Leffler 		error = EINVAL;
60188768458SSam Leffler 		goto bad;
60288768458SSam Leffler 	}
60388768458SSam Leffler 
60488768458SSam Leffler 	/* Verify correct decryption by checking the last padding bytes */
60588768458SSam Leffler 	if ((sav->flags & SADB_X_EXT_PMASK) != SADB_X_EXT_PRAND) {
60688768458SSam Leffler 		if (lastthree[1] != lastthree[0] && lastthree[1] != 0) {
607a04d64d8SAndrey V. Elsukov 			ESPSTAT_INC(esps_badenc);
6089ffa9677SSam Leffler 			DPRINTF(("%s: decryption failed for packet in "
609962ac6c7SAndrey V. Elsukov 			    "SA %s/%08lx\n", __func__, ipsec_address(
610962ac6c7SAndrey V. Elsukov 			    &sav->sah->saidx.dst, buf, sizeof(buf)),
61188768458SSam Leffler 			    (u_long) ntohl(sav->spi)));
61288768458SSam Leffler 			error = EINVAL;
61388768458SSam Leffler 			goto bad;
61488768458SSam Leffler 		}
61588768458SSam Leffler 	}
61688768458SSam Leffler 
61788768458SSam Leffler 	/* Trim the mbuf chain to remove trailing authenticator and padding */
61888768458SSam Leffler 	m_adj(m, -(lastthree[1] + 2));
61988768458SSam Leffler 
62088768458SSam Leffler 	/* Restore the Next Protocol field */
62188768458SSam Leffler 	m_copyback(m, protoff, sizeof (u_int8_t), lastthree + 2);
62288768458SSam Leffler 
623db178eb8SBjoern A. Zeeb 	switch (saidx->dst.sa.sa_family) {
624db178eb8SBjoern A. Zeeb #ifdef INET6
625db178eb8SBjoern A. Zeeb 	case AF_INET6:
626f0514a8bSAndrey V. Elsukov 		error = ipsec6_common_input_cb(m, sav, skip, protoff);
627db178eb8SBjoern A. Zeeb 		break;
628db178eb8SBjoern A. Zeeb #endif
629db178eb8SBjoern A. Zeeb #ifdef INET
630db178eb8SBjoern A. Zeeb 	case AF_INET:
631f0514a8bSAndrey V. Elsukov 		error = ipsec4_common_input_cb(m, sav, skip, protoff);
632db178eb8SBjoern A. Zeeb 		break;
633db178eb8SBjoern A. Zeeb #endif
634db178eb8SBjoern A. Zeeb 	default:
635db178eb8SBjoern A. Zeeb 		panic("%s: Unexpected address family: %d saidx=%p", __func__,
636db178eb8SBjoern A. Zeeb 		    saidx->dst.sa.sa_family, saidx);
637db178eb8SBjoern A. Zeeb 	}
63888768458SSam Leffler 
63988768458SSam Leffler 	KEY_FREESAV(&sav);
64088768458SSam Leffler 	return error;
64188768458SSam Leffler bad:
64288768458SSam Leffler 	if (sav)
64388768458SSam Leffler 		KEY_FREESAV(&sav);
64488768458SSam Leffler 	if (m != NULL)
64588768458SSam Leffler 		m_freem(m);
64688768458SSam Leffler 	if (tc != NULL)
64788768458SSam Leffler 		free(tc, M_XDATA);
64888768458SSam Leffler 	if (crp != NULL)
64988768458SSam Leffler 		crypto_freereq(crp);
65088768458SSam Leffler 	return error;
65188768458SSam Leffler }
65288768458SSam Leffler 
65388768458SSam Leffler /*
65488768458SSam Leffler  * ESP output routine, called by ipsec[46]_process_packet().
65588768458SSam Leffler  */
65688768458SSam Leffler static int
657962ac6c7SAndrey V. Elsukov esp_output(struct mbuf *m, struct ipsecrequest *isr, struct mbuf **mp,
658962ac6c7SAndrey V. Elsukov     int skip, int protoff)
65988768458SSam Leffler {
660962ac6c7SAndrey V. Elsukov 	char buf[INET6_ADDRSTRLEN];
66188768458SSam Leffler 	struct enc_xform *espx;
66288768458SSam Leffler 	struct auth_hash *esph;
663a2bc81bfSJohn-Mark Gurney 	uint8_t *ivp;
664a2bc81bfSJohn-Mark Gurney 	uint64_t cntr;
665d3e8e66dSPawel Jakub Dawidek 	int hlen, rlen, padding, blks, alen, i, roff;
66688768458SSam Leffler 	struct mbuf *mo = (struct mbuf *) NULL;
66788768458SSam Leffler 	struct tdb_crypto *tc;
66888768458SSam Leffler 	struct secasvar *sav;
66988768458SSam Leffler 	struct secasindex *saidx;
67088768458SSam Leffler 	unsigned char *pad;
67188768458SSam Leffler 	u_int8_t prot;
67288768458SSam Leffler 	int error, maxpacketsize;
67388768458SSam Leffler 
67488768458SSam Leffler 	struct cryptodesc *crde = NULL, *crda = NULL;
67588768458SSam Leffler 	struct cryptop *crp;
67688768458SSam Leffler 
67788768458SSam Leffler 	sav = isr->sav;
6789ffa9677SSam Leffler 	IPSEC_ASSERT(sav != NULL, ("null SA"));
67988768458SSam Leffler 	esph = sav->tdb_authalgxform;
68088768458SSam Leffler 	espx = sav->tdb_encalgxform;
6819ffa9677SSam Leffler 	IPSEC_ASSERT(espx != NULL, ("null encoding xform"));
68288768458SSam Leffler 
68388768458SSam Leffler 	if (sav->flags & SADB_X_EXT_OLD)
68488768458SSam Leffler 		hlen = sizeof (struct esp) + sav->ivlen;
68588768458SSam Leffler 	else
68688768458SSam Leffler 		hlen = sizeof (struct newesp) + sav->ivlen;
68788768458SSam Leffler 
68888768458SSam Leffler 	rlen = m->m_pkthdr.len - skip;	/* Raw payload length. */
68988768458SSam Leffler 	/*
690a2bc81bfSJohn-Mark Gurney 	 * RFC4303 2.4 Requires 4 byte alignment.
69188768458SSam Leffler 	 */
692a2bc81bfSJohn-Mark Gurney 	blks = MAX(4, espx->blocksize);		/* Cipher blocksize */
69388768458SSam Leffler 
69488768458SSam Leffler 	/* XXX clamp padding length a la KAME??? */
69588768458SSam Leffler 	padding = ((blks - ((rlen + 2) % blks)) % blks) + 2;
69688768458SSam Leffler 
697a09a7146SJohn-Mark Gurney 	alen = xform_ah_authsize(esph);
69888768458SSam Leffler 
699a04d64d8SAndrey V. Elsukov 	ESPSTAT_INC(esps_output);
70088768458SSam Leffler 
70188768458SSam Leffler 	saidx = &sav->sah->saidx;
70288768458SSam Leffler 	/* Check for maximum packet size violations. */
70388768458SSam Leffler 	switch (saidx->dst.sa.sa_family) {
70488768458SSam Leffler #ifdef INET
70588768458SSam Leffler 	case AF_INET:
70688768458SSam Leffler 		maxpacketsize = IP_MAXPACKET;
70788768458SSam Leffler 		break;
70888768458SSam Leffler #endif /* INET */
70988768458SSam Leffler #ifdef INET6
71088768458SSam Leffler 	case AF_INET6:
71188768458SSam Leffler 		maxpacketsize = IPV6_MAXPACKET;
71288768458SSam Leffler 		break;
71388768458SSam Leffler #endif /* INET6 */
71488768458SSam Leffler 	default:
7159ffa9677SSam Leffler 		DPRINTF(("%s: unknown/unsupported protocol "
7169ffa9677SSam Leffler 		    "family %d, SA %s/%08lx\n", __func__,
717962ac6c7SAndrey V. Elsukov 		    saidx->dst.sa.sa_family, ipsec_address(&saidx->dst,
718962ac6c7SAndrey V. Elsukov 			buf, sizeof(buf)), (u_long) ntohl(sav->spi)));
719a04d64d8SAndrey V. Elsukov 		ESPSTAT_INC(esps_nopf);
72088768458SSam Leffler 		error = EPFNOSUPPORT;
72188768458SSam Leffler 		goto bad;
72288768458SSam Leffler 	}
72316de9ac1SGeorge V. Neville-Neil 	DPRINTF(("%s: skip %d hlen %d rlen %d padding %d alen %d blksd %d\n",
72416de9ac1SGeorge V. Neville-Neil 		__func__, skip, hlen, rlen, padding, alen, blks));
72588768458SSam Leffler 	if (skip + hlen + rlen + padding + alen > maxpacketsize) {
7269ffa9677SSam Leffler 		DPRINTF(("%s: packet in SA %s/%08lx got too big "
7279ffa9677SSam Leffler 		    "(len %u, max len %u)\n", __func__,
728962ac6c7SAndrey V. Elsukov 		    ipsec_address(&saidx->dst, buf, sizeof(buf)),
729962ac6c7SAndrey V. Elsukov 		    (u_long) ntohl(sav->spi),
73088768458SSam Leffler 		    skip + hlen + rlen + padding + alen, maxpacketsize));
731a04d64d8SAndrey V. Elsukov 		ESPSTAT_INC(esps_toobig);
73288768458SSam Leffler 		error = EMSGSIZE;
73388768458SSam Leffler 		goto bad;
73488768458SSam Leffler 	}
73588768458SSam Leffler 
73688768458SSam Leffler 	/* Update the counters. */
737a04d64d8SAndrey V. Elsukov 	ESPSTAT_ADD(esps_obytes, m->m_pkthdr.len - skip);
73888768458SSam Leffler 
73947e2996eSSam Leffler 	m = m_unshare(m, M_NOWAIT);
74088768458SSam Leffler 	if (m == NULL) {
7419ffa9677SSam Leffler 		DPRINTF(("%s: cannot clone mbuf chain, SA %s/%08lx\n", __func__,
742962ac6c7SAndrey V. Elsukov 		    ipsec_address(&saidx->dst, buf, sizeof(buf)),
743962ac6c7SAndrey V. Elsukov 		    (u_long) ntohl(sav->spi)));
744a04d64d8SAndrey V. Elsukov 		ESPSTAT_INC(esps_hdrops);
74588768458SSam Leffler 		error = ENOBUFS;
74688768458SSam Leffler 		goto bad;
74788768458SSam Leffler 	}
74888768458SSam Leffler 
74988768458SSam Leffler 	/* Inject ESP header. */
75088768458SSam Leffler 	mo = m_makespace(m, skip, hlen, &roff);
75188768458SSam Leffler 	if (mo == NULL) {
7529ffa9677SSam Leffler 		DPRINTF(("%s: %u byte ESP hdr inject failed for SA %s/%08lx\n",
753962ac6c7SAndrey V. Elsukov 		    __func__, hlen, ipsec_address(&saidx->dst, buf,
754962ac6c7SAndrey V. Elsukov 		    sizeof(buf)), (u_long) ntohl(sav->spi)));
755a04d64d8SAndrey V. Elsukov 		ESPSTAT_INC(esps_hdrops);		/* XXX diffs from openbsd */
75688768458SSam Leffler 		error = ENOBUFS;
75788768458SSam Leffler 		goto bad;
75888768458SSam Leffler 	}
75988768458SSam Leffler 
76088768458SSam Leffler 	/* Initialize ESP header. */
76188768458SSam Leffler 	bcopy((caddr_t) &sav->spi, mtod(mo, caddr_t) + roff, sizeof(u_int32_t));
76288768458SSam Leffler 	if (sav->replay) {
763dfa9422bSPawel Jakub Dawidek 		u_int32_t replay;
764dfa9422bSPawel Jakub Dawidek 
7656131838bSPawel Jakub Dawidek #ifdef REGRESSION
766dfa9422bSPawel Jakub Dawidek 		/* Emulate replay attack when ipsec_replay is TRUE. */
767603724d3SBjoern A. Zeeb 		if (!V_ipsec_replay)
7686131838bSPawel Jakub Dawidek #endif
769dfa9422bSPawel Jakub Dawidek 			sav->replay->count++;
770dfa9422bSPawel Jakub Dawidek 		replay = htonl(sav->replay->count);
77188768458SSam Leffler 		bcopy((caddr_t) &replay,
77288768458SSam Leffler 		    mtod(mo, caddr_t) + roff + sizeof(u_int32_t),
77388768458SSam Leffler 		    sizeof(u_int32_t));
77488768458SSam Leffler 	}
77588768458SSam Leffler 
77688768458SSam Leffler 	/*
77788768458SSam Leffler 	 * Add padding -- better to do it ourselves than use the crypto engine,
77888768458SSam Leffler 	 * although if/when we support compression, we'd have to do that.
77988768458SSam Leffler 	 */
78088768458SSam Leffler 	pad = (u_char *) m_pad(m, padding + alen);
78188768458SSam Leffler 	if (pad == NULL) {
7829ffa9677SSam Leffler 		DPRINTF(("%s: m_pad failed for SA %s/%08lx\n", __func__,
783962ac6c7SAndrey V. Elsukov 		    ipsec_address(&saidx->dst, buf, sizeof(buf)),
784962ac6c7SAndrey V. Elsukov 		    (u_long) ntohl(sav->spi)));
78588768458SSam Leffler 		m = NULL;		/* NB: free'd by m_pad */
78688768458SSam Leffler 		error = ENOBUFS;
78788768458SSam Leffler 		goto bad;
78888768458SSam Leffler 	}
78988768458SSam Leffler 
79088768458SSam Leffler 	/*
79188768458SSam Leffler 	 * Add padding: random, zero, or self-describing.
79288768458SSam Leffler 	 * XXX catch unexpected setting
79388768458SSam Leffler 	 */
79488768458SSam Leffler 	switch (sav->flags & SADB_X_EXT_PMASK) {
79588768458SSam Leffler 	case SADB_X_EXT_PRAND:
79688768458SSam Leffler 		(void) read_random(pad, padding - 2);
79788768458SSam Leffler 		break;
79888768458SSam Leffler 	case SADB_X_EXT_PZERO:
79988768458SSam Leffler 		bzero(pad, padding - 2);
80088768458SSam Leffler 		break;
80188768458SSam Leffler 	case SADB_X_EXT_PSEQ:
80288768458SSam Leffler 		for (i = 0; i < padding - 2; i++)
80388768458SSam Leffler 			pad[i] = i+1;
80488768458SSam Leffler 		break;
80588768458SSam Leffler 	}
80688768458SSam Leffler 
80788768458SSam Leffler 	/* Fix padding length and Next Protocol in padding itself. */
80888768458SSam Leffler 	pad[padding - 2] = padding - 2;
80988768458SSam Leffler 	m_copydata(m, protoff, sizeof(u_int8_t), pad + padding - 1);
81088768458SSam Leffler 
81188768458SSam Leffler 	/* Fix Next Protocol in IPv4/IPv6 header. */
81288768458SSam Leffler 	prot = IPPROTO_ESP;
81388768458SSam Leffler 	m_copyback(m, protoff, sizeof(u_int8_t), (u_char *) &prot);
81488768458SSam Leffler 
81588768458SSam Leffler 	/* Get crypto descriptors. */
816a2bc81bfSJohn-Mark Gurney 	crp = crypto_getreq(esph != NULL ? 2 : 1);
81788768458SSam Leffler 	if (crp == NULL) {
8189ffa9677SSam Leffler 		DPRINTF(("%s: failed to acquire crypto descriptors\n",
8199ffa9677SSam Leffler 			__func__));
820a04d64d8SAndrey V. Elsukov 		ESPSTAT_INC(esps_crypto);
82188768458SSam Leffler 		error = ENOBUFS;
82288768458SSam Leffler 		goto bad;
82388768458SSam Leffler 	}
82488768458SSam Leffler 
825a2bc81bfSJohn-Mark Gurney 	/* IPsec-specific opaque crypto info. */
826a2bc81bfSJohn-Mark Gurney 	tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
827a2bc81bfSJohn-Mark Gurney 	    M_XDATA, M_NOWAIT|M_ZERO);
828a2bc81bfSJohn-Mark Gurney 	if (tc == NULL) {
829a2bc81bfSJohn-Mark Gurney 		crypto_freereq(crp);
830a2bc81bfSJohn-Mark Gurney 		DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
831a2bc81bfSJohn-Mark Gurney 		ESPSTAT_INC(esps_crypto);
832a2bc81bfSJohn-Mark Gurney 		error = ENOBUFS;
833a2bc81bfSJohn-Mark Gurney 		goto bad;
834a2bc81bfSJohn-Mark Gurney 	}
835a2bc81bfSJohn-Mark Gurney 
83688768458SSam Leffler 	crde = crp->crp_desc;
83788768458SSam Leffler 	crda = crde->crd_next;
83888768458SSam Leffler 
83988768458SSam Leffler 	/* Encryption descriptor. */
84088768458SSam Leffler 	crde->crd_skip = skip + hlen;
84188768458SSam Leffler 	crde->crd_len = m->m_pkthdr.len - (skip + hlen + alen);
84288768458SSam Leffler 	crde->crd_flags = CRD_F_ENCRYPT;
84388768458SSam Leffler 	crde->crd_inject = skip + hlen - sav->ivlen;
84488768458SSam Leffler 
84588768458SSam Leffler 	/* Encryption operation. */
84688768458SSam Leffler 	crde->crd_alg = espx->type;
847a2bc81bfSJohn-Mark Gurney 	if (SAV_ISCTRORGCM(sav)) {
848a2bc81bfSJohn-Mark Gurney 		ivp = &crde->crd_iv[0];
84988768458SSam Leffler 
850a2bc81bfSJohn-Mark Gurney 		/* GCM IV Format: RFC4106 4 */
851a2bc81bfSJohn-Mark Gurney 		/* CTR IV Format: RFC3686 4 */
852a2bc81bfSJohn-Mark Gurney 		/* Salt is last four bytes of key, RFC4106 8.1 */
853a2bc81bfSJohn-Mark Gurney 		/* Nonce is last four bytes of key, RFC3686 5.1 */
854a2bc81bfSJohn-Mark Gurney 		memcpy(ivp, sav->key_enc->key_data +
855a2bc81bfSJohn-Mark Gurney 		    _KEYLEN(sav->key_enc) - 4, 4);
856a2bc81bfSJohn-Mark Gurney 		SECASVAR_LOCK(sav);
857a2bc81bfSJohn-Mark Gurney 		cntr = sav->cntr++;
858a2bc81bfSJohn-Mark Gurney 		SECASVAR_UNLOCK(sav);
859a2bc81bfSJohn-Mark Gurney 		be64enc(&ivp[4], cntr);
860a2bc81bfSJohn-Mark Gurney 
861a2bc81bfSJohn-Mark Gurney 		if (SAV_ISCTR(sav)) {
862a2bc81bfSJohn-Mark Gurney 			/* Initial block counter is 1, RFC3686 4 */
863a2bc81bfSJohn-Mark Gurney 			be32enc(&ivp[sav->ivlen + 4], 1);
864a2bc81bfSJohn-Mark Gurney 		}
865a2bc81bfSJohn-Mark Gurney 
866a2bc81bfSJohn-Mark Gurney 		m_copyback(m, skip + hlen - sav->ivlen, sav->ivlen, &ivp[4]);
867a2bc81bfSJohn-Mark Gurney 		crde->crd_flags |= CRD_F_IV_EXPLICIT|CRD_F_IV_PRESENT;
86888768458SSam Leffler 	}
86988768458SSam Leffler 
87088768458SSam Leffler 	/* Callback parameters */
871f3677984SAndrey V. Elsukov 	key_addref(isr->sp);
87288768458SSam Leffler 	tc->tc_isr = isr;
87373171433SFabien Thomas 	KEY_ADDREFSA(sav);
87473171433SFabien Thomas 	tc->tc_sav = sav;
87588768458SSam Leffler 	tc->tc_spi = sav->spi;
87688768458SSam Leffler 	tc->tc_dst = saidx->dst;
87788768458SSam Leffler 	tc->tc_proto = saidx->proto;
87888768458SSam Leffler 
87988768458SSam Leffler 	/* Crypto operation descriptor. */
88088768458SSam Leffler 	crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
881d8409aafSSam Leffler 	crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
88288768458SSam Leffler 	crp->crp_buf = (caddr_t) m;
88388768458SSam Leffler 	crp->crp_callback = esp_output_cb;
88488768458SSam Leffler 	crp->crp_opaque = (caddr_t) tc;
88588768458SSam Leffler 	crp->crp_sid = sav->tdb_cryptoid;
88688768458SSam Leffler 
88788768458SSam Leffler 	if (esph) {
88888768458SSam Leffler 		/* Authentication descriptor. */
889a2bc81bfSJohn-Mark Gurney 		crda->crd_alg = esph->type;
89088768458SSam Leffler 		crda->crd_skip = skip;
891a2bc81bfSJohn-Mark Gurney 		if (SAV_ISGCM(sav))
892a2bc81bfSJohn-Mark Gurney 			crda->crd_len = 8;	/* RFC4106 5, SPI + SN */
89316de9ac1SGeorge V. Neville-Neil 		else
89488768458SSam Leffler 			crda->crd_len = m->m_pkthdr.len - (skip + alen);
89588768458SSam Leffler 		crda->crd_inject = m->m_pkthdr.len - alen;
89616de9ac1SGeorge V. Neville-Neil 	}
89716de9ac1SGeorge V. Neville-Neil 
89888768458SSam Leffler 	return crypto_dispatch(crp);
89988768458SSam Leffler bad:
90088768458SSam Leffler 	if (m)
90188768458SSam Leffler 		m_freem(m);
90288768458SSam Leffler 	return (error);
90388768458SSam Leffler }
90488768458SSam Leffler 
90588768458SSam Leffler /*
90688768458SSam Leffler  * ESP output callback from the crypto driver.
90788768458SSam Leffler  */
90888768458SSam Leffler static int
90988768458SSam Leffler esp_output_cb(struct cryptop *crp)
91088768458SSam Leffler {
911962ac6c7SAndrey V. Elsukov 	char buf[INET6_ADDRSTRLEN];
91288768458SSam Leffler 	struct tdb_crypto *tc;
91388768458SSam Leffler 	struct ipsecrequest *isr;
91488768458SSam Leffler 	struct secasvar *sav;
91588768458SSam Leffler 	struct mbuf *m;
9160e4fb1dbSPawel Jakub Dawidek 	int error;
91788768458SSam Leffler 
91888768458SSam Leffler 	tc = (struct tdb_crypto *) crp->crp_opaque;
9199ffa9677SSam Leffler 	IPSEC_ASSERT(tc != NULL, ("null opaque data area!"));
92088768458SSam Leffler 	m = (struct mbuf *) crp->crp_buf;
92188768458SSam Leffler 
92288768458SSam Leffler 	isr = tc->tc_isr;
9233d80e82dSAndrey V. Elsukov 	IPSEC_ASSERT(isr->sp != NULL, ("NULL isr->sp"));
9249ffa9677SSam Leffler 	IPSECREQUEST_LOCK(isr);
92573171433SFabien Thomas 	sav = tc->tc_sav;
926a2bc81bfSJohn-Mark Gurney 
927a2bc81bfSJohn-Mark Gurney 	/* With the isr lock released, SA pointer may have changed. */
92873171433SFabien Thomas 	if (sav != isr->sav) {
929a04d64d8SAndrey V. Elsukov 		ESPSTAT_INC(esps_notdb);
9309ffa9677SSam Leffler 		DPRINTF(("%s: SA gone during crypto (SA %s/%08lx proto %u)\n",
931962ac6c7SAndrey V. Elsukov 		    __func__, ipsec_address(&tc->tc_dst, buf, sizeof(buf)),
93288768458SSam Leffler 		    (u_long) ntohl(tc->tc_spi), tc->tc_proto));
93388768458SSam Leffler 		error = ENOBUFS;		/*XXX*/
93488768458SSam Leffler 		goto bad;
93588768458SSam Leffler 	}
93688768458SSam Leffler 
93788768458SSam Leffler 	/* Check for crypto errors. */
93888768458SSam Leffler 	if (crp->crp_etype) {
93988768458SSam Leffler 		/* Reset session ID. */
94088768458SSam Leffler 		if (sav->tdb_cryptoid != 0)
94188768458SSam Leffler 			sav->tdb_cryptoid = crp->crp_sid;
94288768458SSam Leffler 
94388768458SSam Leffler 		if (crp->crp_etype == EAGAIN) {
9449ffa9677SSam Leffler 			IPSECREQUEST_UNLOCK(isr);
9450a95a08eSPawel Jakub Dawidek 			return (crypto_dispatch(crp));
94688768458SSam Leffler 		}
94788768458SSam Leffler 
948a04d64d8SAndrey V. Elsukov 		ESPSTAT_INC(esps_noxform);
9499ffa9677SSam Leffler 		DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
95088768458SSam Leffler 		error = crp->crp_etype;
95188768458SSam Leffler 		goto bad;
95288768458SSam Leffler 	}
95388768458SSam Leffler 
95488768458SSam Leffler 	/* Shouldn't happen... */
95588768458SSam Leffler 	if (m == NULL) {
956a04d64d8SAndrey V. Elsukov 		ESPSTAT_INC(esps_crypto);
9579ffa9677SSam Leffler 		DPRINTF(("%s: bogus returned buffer from crypto\n", __func__));
95888768458SSam Leffler 		error = EINVAL;
95988768458SSam Leffler 		goto bad;
96088768458SSam Leffler 	}
961a04d64d8SAndrey V. Elsukov 	ESPSTAT_INC(esps_hist[sav->alg_enc]);
96288768458SSam Leffler 	if (sav->tdb_authalgxform != NULL)
963a04d64d8SAndrey V. Elsukov 		AHSTAT_INC(ahs_hist[sav->alg_auth]);
96488768458SSam Leffler 
96588768458SSam Leffler 	/* Release crypto descriptors. */
96688768458SSam Leffler 	free(tc, M_XDATA);
96788768458SSam Leffler 	crypto_freereq(crp);
96888768458SSam Leffler 
9696131838bSPawel Jakub Dawidek #ifdef REGRESSION
970dfa9422bSPawel Jakub Dawidek 	/* Emulate man-in-the-middle attack when ipsec_integrity is TRUE. */
971603724d3SBjoern A. Zeeb 	if (V_ipsec_integrity) {
972442da28aSVANHULLEBUS Yvan 		static unsigned char ipseczeroes[AH_HMAC_MAXHASHLEN];
973dfa9422bSPawel Jakub Dawidek 		struct auth_hash *esph;
974dfa9422bSPawel Jakub Dawidek 
975dfa9422bSPawel Jakub Dawidek 		/*
976dfa9422bSPawel Jakub Dawidek 		 * Corrupt HMAC if we want to test integrity verification of
977dfa9422bSPawel Jakub Dawidek 		 * the other side.
978dfa9422bSPawel Jakub Dawidek 		 */
979dfa9422bSPawel Jakub Dawidek 		esph = sav->tdb_authalgxform;
980dfa9422bSPawel Jakub Dawidek 		if (esph !=  NULL) {
981442da28aSVANHULLEBUS Yvan 			int alen;
982442da28aSVANHULLEBUS Yvan 
983a09a7146SJohn-Mark Gurney 			alen = xform_ah_authsize(esph);
984442da28aSVANHULLEBUS Yvan 			m_copyback(m, m->m_pkthdr.len - alen,
985442da28aSVANHULLEBUS Yvan 			    alen, ipseczeroes);
986dfa9422bSPawel Jakub Dawidek 		}
987dfa9422bSPawel Jakub Dawidek 	}
9886131838bSPawel Jakub Dawidek #endif
989dfa9422bSPawel Jakub Dawidek 
99088768458SSam Leffler 	/* NB: m is reclaimed by ipsec_process_done. */
9910e4fb1dbSPawel Jakub Dawidek 	error = ipsec_process_done(m, isr);
99288768458SSam Leffler 	KEY_FREESAV(&sav);
9939ffa9677SSam Leffler 	IPSECREQUEST_UNLOCK(isr);
9943d80e82dSAndrey V. Elsukov 	KEY_FREESP(&isr->sp);
9953d80e82dSAndrey V. Elsukov 	return (error);
99688768458SSam Leffler bad:
99788768458SSam Leffler 	if (sav)
99888768458SSam Leffler 		KEY_FREESAV(&sav);
9999ffa9677SSam Leffler 	IPSECREQUEST_UNLOCK(isr);
10003d80e82dSAndrey V. Elsukov 	KEY_FREESP(&isr->sp);
100188768458SSam Leffler 	if (m)
100288768458SSam Leffler 		m_freem(m);
100388768458SSam Leffler 	free(tc, M_XDATA);
100488768458SSam Leffler 	crypto_freereq(crp);
10053d80e82dSAndrey V. Elsukov 	return (error);
100688768458SSam Leffler }
100788768458SSam Leffler 
100888768458SSam Leffler static struct xformsw esp_xformsw = {
100988768458SSam Leffler 	XF_ESP,		XFT_CONF|XFT_AUTH,	"IPsec ESP",
101088768458SSam Leffler 	esp_init,	esp_zeroize,		esp_input,
101188768458SSam Leffler 	esp_output
101288768458SSam Leffler };
101388768458SSam Leffler 
101488768458SSam Leffler static void
101588768458SSam Leffler esp_attach(void)
101688768458SSam Leffler {
10171ed81b73SMarko Zec 
1018eddfbb76SRobert Watson 	xform_register(&esp_xformsw);
101988768458SSam Leffler }
10208976be94SSam Leffler SYSINIT(esp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, esp_attach, NULL);
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