FreeBSD/Linux Kernel Cross Reference
sys/netipsec/xform.h
1 /* $FreeBSD: src/sys/netipsec/xform.h,v 1.4 2007/11/28 22:33:52 bz Exp $ */
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_INITIAL_RPL 1 /* replay counter initial value */
50
51 /*
52 * Packet tag assigned on completion of IPsec processing; used
53 * to speedup processing when/if the packet comes back for more
54 * processing.
55 */
56 struct tdb_ident {
57 u_int32_t spi;
58 union sockaddr_union dst;
59 u_int8_t proto;
60 /* Cache those two for enc(4) in xform_ipip. */
61 u_int8_t alg_auth;
62 u_int8_t alg_enc;
63 };
64
65 /*
66 * Opaque data structure hung off a crypto operation descriptor.
67 */
68 struct tdb_crypto {
69 struct ipsecrequest *tc_isr; /* ipsec request state */
70 u_int32_t tc_spi; /* associated SPI */
71 union sockaddr_union tc_dst; /* dst addr of packet */
72 u_int8_t tc_proto; /* current protocol, e.g. AH */
73 u_int8_t tc_nxt; /* next protocol, e.g. IPV4 */
74 int tc_protoff; /* current protocol offset */
75 int tc_skip; /* data offset */
76 caddr_t tc_ptr; /* associated crypto data */
77 };
78
79 struct secasvar;
80 struct ipescrequest;
81
82 struct xformsw {
83 u_short xf_type; /* xform ID */
84 #define XF_IP4 1 /* IP inside IP */
85 #define XF_AH 2 /* AH */
86 #define XF_ESP 3 /* ESP */
87 #define XF_TCPSIGNATURE 5 /* TCP MD5 Signature option, RFC 2358 */
88 #define XF_IPCOMP 6 /* IPCOMP */
89 u_short xf_flags;
90 #define XFT_AUTH 0x0001
91 #define XFT_CONF 0x0100
92 #define XFT_COMP 0x1000
93 char *xf_name; /* human-readable name */
94 int (*xf_init)(struct secasvar*, struct xformsw*); /* setup */
95 int (*xf_zeroize)(struct secasvar*); /* cleanup */
96 int (*xf_input)(struct mbuf*, struct secasvar*, /* input */
97 int, int);
98 int (*xf_output)(struct mbuf*, /* output */
99 struct ipsecrequest *, struct mbuf **, int, int);
100 struct xformsw *xf_next; /* list of registered xforms */
101 };
102
103 #ifdef _KERNEL
104 extern void xform_register(struct xformsw*);
105 extern int xform_init(struct secasvar *sav, int xftype);
106
107 struct cryptoini;
108
109 /* XF_IP4 */
110 extern int ip4_input6(struct mbuf **m, int *offp, int proto);
111 extern void ip4_input(struct mbuf *m, int);
112 extern int ipip_output(struct mbuf *, struct ipsecrequest *,
113 struct mbuf **, int, int);
114
115 /* XF_AH */
116 extern int ah_init0(struct secasvar *, struct xformsw *, struct cryptoini *);
117 extern int ah_zeroize(struct secasvar *sav);
118 extern struct auth_hash *ah_algorithm_lookup(int alg);
119 extern size_t ah_hdrsiz(struct secasvar *);
120
121 /* XF_ESP */
122 extern struct enc_xform *esp_algorithm_lookup(int alg);
123 extern size_t esp_hdrsiz(struct secasvar *sav);
124
125 /* XF_COMP */
126 extern struct comp_algo *ipcomp_algorithm_lookup(int alg);
127
128 #endif /* _KERNEL */
129 #endif /* _NETIPSEC_XFORM_H_ */
130
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