xref: /freebsd/sys/netipsec/xform.h (revision 5608fd23c27fa1e8ee595d7b678cbfd35d657fbe)
1 /*	$FreeBSD$	*/
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 <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 /*
53  * Packet tag assigned on completion of IPsec processing; used
54  * to speedup processing when/if the packet comes back for more
55  * processing.
56  */
57 struct tdb_ident {
58 	u_int32_t spi;
59 	union sockaddr_union dst;
60 	u_int8_t proto;
61 	/* Cache those two for enc(4) in xform_ipip. */
62 	u_int8_t alg_auth;
63 	u_int8_t alg_enc;
64 };
65 
66 /*
67  * Opaque data structure hung off a crypto operation descriptor.
68  */
69 struct tdb_crypto {
70 	struct ipsecrequest	*tc_isr;	/* ipsec request state */
71 	u_int32_t		tc_spi;		/* associated SPI */
72 	union sockaddr_union	tc_dst;		/* dst addr of packet */
73 	u_int8_t		tc_proto;	/* current protocol, e.g. AH */
74 	u_int8_t		tc_nxt;		/* next protocol, e.g. IPV4 */
75 	int			tc_protoff;	/* current protocol offset */
76 	int			tc_skip;	/* data offset */
77 	caddr_t			tc_ptr;		/* associated crypto data */
78 	struct secasvar 	*tc_sav;	/* related SA */
79 };
80 
81 struct secasvar;
82 struct ipescrequest;
83 
84 struct xformsw {
85 	u_short	xf_type;		/* xform ID */
86 #define	XF_IP4		1	/* IP inside IP */
87 #define	XF_AH		2	/* AH */
88 #define	XF_ESP		3	/* ESP */
89 #define	XF_TCPSIGNATURE	5	/* TCP MD5 Signature option, RFC 2358 */
90 #define	XF_IPCOMP	6	/* IPCOMP */
91 	u_short	xf_flags;
92 #define	XFT_AUTH	0x0001
93 #define	XFT_CONF	0x0100
94 #define	XFT_COMP	0x1000
95 	char	*xf_name;			/* human-readable name */
96 	int	(*xf_init)(struct secasvar*, struct xformsw*);	/* setup */
97 	int	(*xf_zeroize)(struct secasvar*);		/* cleanup */
98 	int	(*xf_input)(struct mbuf*, struct secasvar*,	/* input */
99 			int, int);
100 	int	(*xf_output)(struct mbuf*,	       		/* output */
101 			struct ipsecrequest *, struct mbuf **, int, int);
102 	struct xformsw *xf_next;		/* list of registered xforms */
103 };
104 
105 #ifdef _KERNEL
106 extern void xform_register(struct xformsw*);
107 extern int xform_init(struct secasvar *sav, int xftype);
108 
109 struct cryptoini;
110 
111 /* XF_IP4 */
112 extern	int ip4_input6(struct mbuf **m, int *offp, int proto);
113 extern	int ip4_input(struct mbuf **, int *, int);
114 extern	int ipip_output(struct mbuf *, struct ipsecrequest *,
115 			struct mbuf **, int, int);
116 
117 /* XF_AH */
118 extern int ah_init0(struct secasvar *, struct xformsw *, struct cryptoini *);
119 extern int ah_zeroize(struct secasvar *sav);
120 extern struct auth_hash *ah_algorithm_lookup(int alg);
121 extern size_t ah_hdrsiz(struct secasvar *);
122 
123 /* XF_ESP */
124 extern struct enc_xform *esp_algorithm_lookup(int alg);
125 extern size_t esp_hdrsiz(struct secasvar *sav);
126 
127 /* XF_COMP */
128 extern struct comp_algo *ipcomp_algorithm_lookup(int alg);
129 
130 #endif /* _KERNEL */
131 #endif /* _NETIPSEC_XFORM_H_ */
132