1/* $FreeBSD: src/sys/netinet6/ipcomp.h,v 1.1.2.2 2001/07/03 11:01:54 ume Exp $ */
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 _NETINET6_IPCOMP_H_
38#define _NETINET6_IPCOMP_H_
39#include <sys/appleapiopts.h>
40#include <netinet6/ipsec.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/* 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
56#ifdef BSD_KERNEL_PRIVATE
57struct ipcomp_algorithm {
58 int (*compress)(struct mbuf *, struct mbuf *, size_t *);
59 int (*decompress)(struct mbuf *, struct mbuf *, size_t *);
60 size_t minplen; /* minimum required length for compression */
61};
62
63struct ipsecrequest;
64extern const struct ipcomp_algorithm *ipcomp_algorithm_lookup(int);
65extern void ipcomp4_input(struct mbuf *, int);
66extern int ipcomp4_output(struct mbuf *, struct secasvar *);
67#endif /* BSD_KERNEL_PRIVATE */
68
69#endif /* _NETINET6_IPCOMP_H_ */
70