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_ */