1/*	$FreeBSD: src/sys/netinet6/esp.h,v 1.2.2.2 2001/07/03 11:01:49 ume Exp $	*/
2/*	$KAME: esp.h,v 1.16 2000/10/18 21:28:00 itojun Exp $	*/
3
4/*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33/*
34 * RFC1827/2406 Encapsulated Security Payload.
35 */
36
37#ifndef _NETINET6_ESP_H_
38#define _NETINET6_ESP_H_
39#include <sys/appleapiopts.h>
40
41
42struct esp {
43	u_int32_t	esp_spi;	/* ESP */
44	/*variable size, 32bit bound*/	/* Initialization Vector */
45	/*variable size*/		/* Payload data */
46	/*variable size*/		/* padding */
47	/*8bit*/			/* pad size */
48	/*8bit*/			/* next header */
49	/*8bit*/			/* next header */
50	/*variable size, 32bit bound*/	/* Authentication data (new IPsec) */
51};
52
53struct newesp {
54	u_int32_t	esp_spi;	/* ESP */
55	u_int32_t	esp_seq;	/* Sequence number */
56	/*variable size*/		/* (IV and) Payload data */
57	/*variable size*/		/* padding */
58	/*8bit*/			/* pad size */
59	/*8bit*/			/* next header */
60	/*8bit*/			/* next header */
61	/*variable size, 32bit bound*/	/* Authentication data */
62};
63
64struct esptail {
65	u_int8_t	esp_padlen;	/* pad length */
66	u_int8_t	esp_nxt;	/* Next header */
67	/*variable size, 32bit bound*/	/* Authentication data (new IPsec)*/
68};
69
70#ifdef KERNEL_PRIVATE
71struct secasvar;
72
73struct esp_algorithm {
74	size_t padbound;	/* pad boundary, in byte */
75	int ivlenval;		/* iv length, in byte */
76	int (*mature)(struct secasvar *);
77	int keymin;	/* in bits */
78	int keymax;	/* in bits */
79	int (*schedlen)(const struct esp_algorithm *);
80	const char *name;
81	int (*ivlen)(const struct esp_algorithm *, struct secasvar *);
82	int (*decrypt)(struct mbuf *, size_t,
83		struct secasvar *, const struct esp_algorithm *, int);
84	int (*encrypt)(struct mbuf *, size_t, size_t,
85		struct secasvar *, const struct esp_algorithm *, int);
86	/* not supposed to be called directly */
87	int (*schedule)(const struct esp_algorithm *, struct secasvar *);
88	int (*blockdecrypt)(const struct esp_algorithm *,
89		struct secasvar *, u_int8_t *, u_int8_t *);
90	int (*blockencrypt)(const struct esp_algorithm *,
91		struct secasvar *, u_int8_t *, u_int8_t *);
92};
93
94extern const struct esp_algorithm *esp_algorithm_lookup(int);
95extern int esp_max_ivlen(void);
96
97/* crypt routines */
98extern int esp4_output(struct mbuf *, struct secasvar *);
99extern void esp4_input(struct mbuf *, int off);
100extern size_t esp_hdrsiz(struct ipsecrequest *);
101
102extern int esp_schedule(const struct esp_algorithm *, struct secasvar *);
103extern int esp_auth(struct mbuf *, size_t, size_t,
104	struct secasvar *, u_char *);
105#endif /* KERNEL_PRIVATE */
106
107#endif /* _NETINET6_ESP_H_ */
108