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      1 /*	$NetBSD: ipcomp.h,v 1.3 2018/04/19 08:27:38 maxv Exp $	*/
      2 /*	$FreeBSD: ipcomp.h,v 1.1.4.1 2003/01/24 05:11:35 sam Exp $	*/
      3 /*	$KAME: ipcomp.h,v 1.8 2000/09/26 07:55:14 itojun Exp $	*/
      4 
      5 /*
      6  * Copyright (C) 1999 WIDE Project.
      7  * All rights reserved.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. Neither the name of the project nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 /*
     35  * RFC2393 IP payload compression protocol (IPComp).
     36  */
     37 
     38 #ifndef _NETIPSEC_IPCOMP_H_
     39 #define _NETIPSEC_IPCOMP_H_
     40 
     41 struct ipcomp {
     42 	u_int8_t comp_nxt;	/* Next Header */
     43 	u_int8_t comp_flags;	/* reserved, must be zero */
     44 	u_int16_t comp_cpi;	/* Compression parameter index */
     45 };
     46 
     47 #define	IPCOMP_HLENGTH	4	/* Length of IPCOMP header */
     48 
     49 /* well-known algorithm number (in CPI), from RFC2409 */
     50 #define IPCOMP_OUI	1	/* vendor specific */
     51 #define IPCOMP_DEFLATE	2	/* RFC2394 */
     52 #define IPCOMP_LZS	3	/* RFC2395 */
     53 #define IPCOMP_MAX	4
     54 
     55 #define IPCOMP_CPI_NEGOTIATE_MIN	256
     56 #endif /* !_NETIPSEC_IPCOMP_H_ */
     57