1 /* $FreeBSD: src/sys/netinet6/ipcomp.h,v 1.4 2002/04/19 04:46:23 suz Exp $ */ 2 /* $KAME: ipcomp.h,v 1.11 2001/09/04 08:43:19 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 40 #if defined(_KERNEL) && !defined(_LKM) 41 #include "opt_inet.h" 42 #endif 43 44 struct ipcomp { 45 u_int8_t comp_nxt; /* Next Header */ 46 u_int8_t comp_flags; /* reserved, must be zero */ 47 u_int16_t comp_cpi; /* Compression parameter index */ 48 }; 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 58 #ifdef _KERNEL 59 struct ipcomp_algorithm { 60 int (*compress) __P((struct mbuf *, struct mbuf *, size_t *)); 61 int (*decompress) __P((struct mbuf *, struct mbuf *, size_t *)); 62 size_t minplen; /* minimum required length for compression */ 63 }; 64 65 struct ipsecrequest; 66 extern const struct ipcomp_algorithm *ipcomp_algorithm_lookup __P((int)); 67 extern void ipcomp4_input __P((struct mbuf *, int)); 68 extern int ipcomp4_output __P((struct mbuf *, struct ipsecrequest *)); 69 #endif /* KERNEL */ 70 71 #endif /* _NETINET6_IPCOMP_H_ */ 72