1/*	$FreeBSD$	*/
2/*	$KAME: ipcomp.h,v 1.8 2000/09/26 07:55:14 itojun Exp $	*/
3
4/*-
5 * Copyright (C) 1999 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 * RFC2393 IP payload compression protocol (IPComp).
35 */
36
37#ifndef _NETIPSEC_IPCOMP_H_
38#define _NETIPSEC_IPCOMP_H_
39
40struct ipcomp {
41	u_int8_t comp_nxt;	/* Next Header */
42	u_int8_t comp_flags;	/* reserved, must be zero */
43	u_int16_t comp_cpi;	/* Compression parameter index */
44};
45
46#define	IPCOMP_HLENGTH	4	/* Length of IPCOMP header */
47
48/* well-known algorithm number (in CPI), from RFC2409 */
49#define IPCOMP_OUI	1	/* vendor specific */
50#define IPCOMP_DEFLATE	2	/* RFC2394 */
51#define IPCOMP_LZS	3	/* RFC2395 */
52#define IPCOMP_MAX	4
53
54#define IPCOMP_CPI_NEGOTIATE_MIN	256
55#endif /*_NETIPSEC_IPCOMP_H_*/
56