xform.h revision 315514 
1/*	$FreeBSD: stable/11/sys/netipsec/xform.h 315514 2017-03-18 22:04:20Z ae $	*/
2/*	$OpenBSD: ip_ipsp.h,v 1.119 2002/03/14 01:27:11 millert Exp $	*/
3/*-
4 * The authors of this code are John Ioannidis (ji@tla.org),
5 * Angelos D. Keromytis (kermit@csd.uch.gr),
6 * Niels Provos (provos@physnet.uni-hamburg.de) and
7 * Niklas Hallqvist (niklas@appli.se).
8 *
9 * The original version of this code was written by John Ioannidis
10 * for BSD/OS in Athens, Greece, in November 1995.
11 *
12 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
13 * by Angelos D. Keromytis.
14 *
15 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
16 * and Niels Provos.
17 *
18 * Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist.
19 *
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.
24 *
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
32 * all.
33 *
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
38 * PURPOSE.
39 */
40
41#ifndef _NETIPSEC_XFORM_H_
42#define _NETIPSEC_XFORM_H_
43
44#include <sys/types.h>
45#include <sys/queue.h>
46#include <netinet/in.h>
47#include <opencrypto/xform.h>
48
49#define	AH_HMAC_HASHLEN		12	/* 96 bits of authenticator */
50#define	AH_HMAC_MAXHASHLEN	(SHA2_512_HASH_LEN/2)	/* Keep this updated */
51#define	AH_HMAC_INITIAL_RPL	1	/* replay counter initial value */
52
53#ifdef _KERNEL
54struct secpolicy;
55struct secasvar;
56
57/*
58 * Packet tag assigned on completion of IPsec processing; used
59 * to speedup security policy checking for INBOUND packets.
60 */
61struct xform_history {
62	union sockaddr_union	dst;		/* destination address */
63	uint32_t		spi;		/* Security Parameters Index */
64	uint8_t			proto;		/* IPPROTO_ESP or IPPROTO_AH */
65	uint8_t			mode;		/* transport or tunnel */
66};
67
68/*
69 * Opaque data structure hung off a crypto operation descriptor.
70 */
71struct xform_data {
72	struct secpolicy	*sp;		/* security policy */
73	struct secasvar		*sav;		/* related SA */
74	uint64_t		cryptoid;	/* used crypto session id */
75	u_int			idx;		/* IPsec request index */
76	int			protoff;	/* current protocol offset */
77	int			skip;		/* data offset */
78	uint8_t			nxt;		/* next protocol, e.g. IPV4 */
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	char	*xf_name;		/* human-readable name */
90	int	(*xf_init)(struct secasvar*, struct xformsw*);	/* setup */
91	int	(*xf_zeroize)(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	LIST_ENTRY(xformsw)	chain;
97};
98
99const struct enc_xform * enc_algorithm_lookup(int);
100const struct auth_hash * auth_algorithm_lookup(int);
101const struct comp_algo * comp_algorithm_lookup(int);
102
103void xform_attach(void *);
104void xform_detach(void *);
105
106struct cryptoini;
107/* XF_AH */
108int xform_ah_authsize(const struct auth_hash *);
109extern int ah_init0(struct secasvar *, struct xformsw *, struct cryptoini *);
110extern int ah_zeroize(struct secasvar *sav);
111extern size_t ah_hdrsiz(struct secasvar *);
112
113/* XF_ESP */
114extern size_t esp_hdrsiz(struct secasvar *sav);
115
116#endif /* _KERNEL */
117#endif /* _NETIPSEC_XFORM_H_ */
118