1/* $NetBSD: xform.h,v 1.8 2016/01/26 06:00:10 knakahara Exp $ */
2/* $FreeBSD: src/sys/netipsec/xform.h,v 1.1.4.1 2003/01/24 05:11:36 sam Exp $ */
3/* $OpenBSD: ip_ipsp.h,v 1.119 2002/03/14 01:27:11 millert Exp $ */
4/*
5 * The authors of this code are John Ioannidis (ji@tla.org),
6 * Angelos D. Keromytis (kermit@csd.uch.gr),
7 * Niels Provos (provos@physnet.uni-hamburg.de) and
8 * Niklas Hallqvist (niklas@appli.se).
9 *
10 * The original version of this code was written by John Ioannidis
11 * for BSD/OS in Athens, Greece, in November 1995.
12 *
13 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
14 * by Angelos D. Keromytis.
15 *
16 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
17 * and Niels Provos.
18 *
19 * Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist.
20 *
21 * Copyright (c) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
22 * Angelos D. Keromytis and Niels Provos.
23 * Copyright (c) 1999 Niklas Hallqvist.
24 * Copyright (c) 2001, Angelos D. Keromytis.
25 *
26 * Permission to use, copy, and modify this software with or without fee
27 * is hereby granted, provided that this entire notice is included in
28 * all copies of any software which is or includes a copy or
29 * modification of this software.
30 * You may use this code under the GNU public license if you so wish. Please
31 * contribute changes back to the authors under this freer than GPL license
32 * so that we may further the use of strong encryption without limitations to
33 * all.
34 *
35 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
36 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
37 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
38 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
39 * PURPOSE.
40 */
41
42#ifndef _NETIPSEC_XFORM_H_
43#define _NETIPSEC_XFORM_H_
44
45#include <sys/types.h>
46#include <netinet/in.h>
47#include <opencrypto/xform.h>
48
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 */
56struct tdb_ident {
57 u_int32_t spi;
58 union sockaddr_union dst;
59 u_int8_t proto;
60};
61
62/*
63 * Opaque data structure hung off a crypto operation descriptor.
64 */
65struct tdb_crypto {
66 struct ipsecrequest *tc_isr; /* ipsec request state */
67 u_int32_t tc_spi; /* associated SPI */
68 union sockaddr_union tc_dst; /* dst addr of packet */
69 u_int8_t tc_proto; /* current protocol, e.g. AH */
70 u_int8_t tc_nxt; /* next protocol, e.g. IPV4 */
71 int tc_protoff; /* current protocol offset */
72 int tc_skip; /* data offset */
73 void * tc_ptr; /* associated crypto data */
74};
75
76struct secasvar;
77struct ipescrequest;
78
79struct xformsw {
80 u_short xf_type; /* xform ID */
81#define XF_IP4 1 /* IP inside IP */
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 u_short xf_flags;
87#define XFT_AUTH 0x0001
88#define XFT_CONF 0x0100
89#define XFT_COMP 0x1000
90 const char *xf_name; /* human-readable name */
91 int (*xf_init)(struct secasvar*, const struct xformsw*);/* setup */
92 int (*xf_zeroize)(struct secasvar*); /* cleanup */
93 int (*xf_input)(struct mbuf*, const struct secasvar*, /* input */
94 int, int);
95 int (*xf_output)(struct mbuf*, /* output */
96 struct ipsecrequest *, struct mbuf **, int, int);
97 struct xformsw *xf_next; /* list of registered xforms */
98};
99
100#ifdef _KERNEL
101extern void xform_register(struct xformsw*);
102extern int xform_init(struct secasvar *sav, int xftype);
103
104struct cryptoini;
105
106/* XF_IP4 */
107extern int ip4_input6(struct mbuf **m, int *offp, int proto);
108extern void ip4_input(struct mbuf *m, int, int);
109extern int ipip_output(struct mbuf *, struct ipsecrequest *,
110 struct mbuf **, int, int);
111
112/* XF_AH */
113extern int ah_init0(struct secasvar *, const struct xformsw *,
114 struct cryptoini *);
115extern int ah_zeroize(struct secasvar *sav);
116extern const struct auth_hash *ah_algorithm_lookup(int alg);
117extern size_t ah_hdrsiz(const struct secasvar *);
118
119/* XF_ESP */
120extern const struct enc_xform *esp_algorithm_lookup(int alg);
121extern size_t esp_hdrsiz(const struct secasvar *sav);
122
123/* XF_COMP */
124extern const struct comp_algo *ipcomp_algorithm_lookup(int alg);
125
126#endif /* _KERNEL */
127#endif /* !_NETIPSEC_XFORM_H_ */
128