1/*	$FreeBSD$	*/
2/*	$KAME: ipcomp.h,v 1.8 2000/09/26 07:55:14 itojun Exp $	*/
3
4/*-
5 * SPDX-License-Identifier: BSD-3-Clause
6 *
7 * Copyright (C) 1999 WIDE Project.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the project nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35/*
36 * RFC2393 IP payload compression protocol (IPComp).
37 */
38
39#ifndef _NETIPSEC_IPCOMP_H_
40#define _NETIPSEC_IPCOMP_H_
41
42struct ipcomp {
43	u_int8_t comp_nxt;	/* Next Header */
44	u_int8_t comp_flags;	/* reserved, must be zero */
45	u_int16_t comp_cpi;	/* Compression parameter index */
46};
47
48#define	IPCOMP_HLENGTH	4	/* Length of IPCOMP header */
49
50/* well-known algorithm number (in CPI), from RFC2409 */
51#define IPCOMP_OUI	1	/* vendor specific */
52#define IPCOMP_DEFLATE	2	/* RFC2394 */
53#define IPCOMP_LZS	3	/* RFC2395 */
54#define IPCOMP_MAX	4
55
56#define IPCOMP_CPI_NEGOTIATE_MIN	256
57#endif /*_NETIPSEC_IPCOMP_H_*/
58