sys/netinet6/ipcomp.h

   1 /*      $FreeBSD: src/sys/netinet6/ipcomp.h,v 1.1.2.3 2002/04/28 05:40:27 suz Exp $     */
   2 /*      $DragonFly: src/sys/netinet6/ipcomp.h,v 1.6 2006/05/20 02:42:12 dillon Exp $    */
   3 /*      $KAME: ipcomp.h,v 1.11 2001/09/04 08:43:19 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 _NETINET6_IPCOMP_H_
  39 #define _NETINET6_IPCOMP_H_
  40
  41 #ifndef _SYS_TYPES_H_
  42 #include <sys/types.h>
  43 #endif
  44
  45 #if defined(_KERNEL) && !defined(_LKM)
  46 #include "opt_inet.h"
  47 #endif
  48
  49 struct ipcomp {
  50         u_int8_t comp_nxt;      /* Next Header */
  51         u_int8_t comp_flags;    /* reserved, must be zero */
  52         u_int16_t comp_cpi;     /* Compression parameter index */
  53 };
  54
  55 /* well-known algorithm number (in CPI), from RFC2409 */
  56 #define IPCOMP_OUI      1       /* vendor specific */
  57 #define IPCOMP_DEFLATE  2       /* RFC2394 */
  58 #define IPCOMP_LZS      3       /* RFC2395 */
  59 #define IPCOMP_MAX      4
  60
  61 #define IPCOMP_CPI_NEGOTIATE_MIN        256
  62
  63 #ifdef _KERNEL
  64
  65 struct mbuf;
  66 struct ipsecrequest;
  67
  68 struct ipcomp_algorithm {
  69         int (*compress) (struct mbuf *, struct mbuf *, size_t *);
  70         int (*decompress) (struct mbuf *, struct mbuf *, size_t *);
  71         size_t minplen;         /* minimum required length for compression */
  72 };
  73
  74 extern const struct ipcomp_algorithm *ipcomp_algorithm_lookup (int);
  75 extern void ipcomp4_input (struct mbuf *, ...);
  76 extern int ipcomp4_output (struct mbuf *, struct ipsecrequest *);
  77 #endif /* KERNEL */
  78
  79 #endif /* _NETINET6_IPCOMP_H_ */