1/*	$OpenBSD: ip_ipsp.h,v 1.119 2002/03/14 01:27:11 millert Exp $	*/
  2/*-
  3 * The authors of this code are John Ioannidis (ji@tla.org),
  4 * Angelos D. Keromytis (kermit@csd.uch.gr),
  5 * Niels Provos (provos@physnet.uni-hamburg.de) and
  6 * Niklas Hallqvist (niklas@appli.se).
  7 *
  8 * The original version of this code was written by John Ioannidis
  9 * for BSD/OS in Athens, Greece, in November 1995.
 10 *
 11 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
 12 * by Angelos D. Keromytis.
 13 *
 14 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
 15 * and Niels Provos.
 16 *
 17 * Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist.
 18 *
 19 * Copyright (c) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
 20 * Angelos D. Keromytis and Niels Provos.
 21 * Copyright (c) 1999 Niklas Hallqvist.
 22 * Copyright (c) 2001, Angelos D. Keromytis.
 23 *
 24 * Permission to use, copy, and modify this software with or without fee
 25 * is hereby granted, provided that this entire notice is included in
 26 * all copies of any software which is or includes a copy or
 27 * modification of this software.
 28 * You may use this code under the GNU public license if you so wish. Please
 29 * contribute changes back to the authors under this freer than GPL license
 30 * so that we may further the use of strong encryption without limitations to
 31 * all.
 32 *
 33 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
 34 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
 35 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
 36 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
 37 * PURPOSE.
 38 */
 39
 40#ifndef _NETIPSEC_XFORM_H_
 41#define _NETIPSEC_XFORM_H_
 42
 43#include <sys/types.h>
 44#include <sys/queue.h>
 45#include <netinet/in.h>
 46#include <opencrypto/xform.h>
 47
 48#define	AH_HMAC_HASHLEN		12	/* 96 bits of authenticator */
 49#define	AH_HMAC_MAXHASHLEN	(SHA2_512_HASH_LEN/2)	/* Keep this updated */
 50#define	AH_HMAC_INITIAL_RPL	1	/* replay counter initial value */
 51
 52#ifdef _KERNEL
 53struct secpolicy;
 54struct secasvar;
 55
 56/*
 57 * Packet tag assigned on completion of IPsec processing; used
 58 * to speedup security policy checking for INBOUND packets.
 59 */
 60struct xform_history {
 61	union sockaddr_union	dst;		/* destination address */
 62	uint32_t		spi;		/* Security Parameters Index */
 63	uint8_t			proto;		/* IPPROTO_ESP or IPPROTO_AH */
 64	uint8_t			mode;		/* transport or tunnel */
 65};
 66
 67/*
 68 * Opaque data structure hung off a crypto operation descriptor.
 69 */
 70struct xform_data {
 71	struct secpolicy	*sp;		/* security policy */
 72	struct secasvar		*sav;		/* related SA */
 73	crypto_session_t	cryptoid;	/* used crypto session */
 74	u_int			idx;		/* IPsec request index */
 75	int			protoff;	/* current protocol offset */
 76	int			skip;		/* data offset */
 77	uint8_t			nxt;		/* next protocol, e.g. IPV4 */
 78	struct vnet		*vnet;
 79};
 80
 81#define	XF_IP4		1	/* unused */
 82#define	XF_AH		2	/* AH */
 83#define	XF_ESP		3	/* ESP */
 84#define	XF_TCPSIGNATURE	5	/* TCP MD5 Signature option, RFC 2358 */
 85#define	XF_IPCOMP	6	/* IPCOMP */
 86
 87struct xformsw {
 88	u_short			xf_type;	/* xform ID */
 89	const char		*xf_name;	/* human-readable name */
 90	int	(*xf_init)(struct secasvar*, struct xformsw*);	/* setup */
 91	void	(*xf_cleanup)(struct secasvar*);		/* cleanup */
 92	int	(*xf_input)(struct mbuf*, struct secasvar*,	/* input */
 93			int, int);
 94	int	(*xf_output)(struct mbuf*,			/* output */
 95	    struct secpolicy *, struct secasvar *, u_int, int, int);
 96
 97	volatile u_int		xf_cntr;
 98	LIST_ENTRY(xformsw)	chain;
 99};
100
101const struct enc_xform * enc_algorithm_lookup(int);
102const struct auth_hash * auth_algorithm_lookup(int);
103const struct comp_algo * comp_algorithm_lookup(int);
104
105void xform_attach(void *);
106void xform_detach(void *);
107int xform_init(struct secasvar *, u_short);
108
109struct crypto_session_params;
110/* XF_AH */
111int xform_ah_authsize(const struct auth_hash *);
112int ah_init0(struct secasvar *, struct xformsw *,
113    struct crypto_session_params *);
114extern size_t ah_hdrsiz(struct secasvar *);
115
116/* XF_ESP */
117extern size_t esp_hdrsiz(struct secasvar *sav);
118
119#endif /* _KERNEL */
120#endif /* _NETIPSEC_XFORM_H_ */