bsd/netinet6/ipcomp.h

   1 /*
   2  * Copyright (C) 1999 WIDE Project.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the project nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 /*
  31  * RFC2393 IP payload compression protocol (IPComp).
  32  */
  33
  34 #ifndef _NETINET6_IPCOMP_H_
  35 #define _NETINET6_IPCOMP_H_
  36
  37 struct ipcomp {
  38         u_int8_t comp_nxt;      /* Next Header */
  39         u_int8_t comp_flags;    /* reserved, must be zero */
  40         u_int16_t comp_cpi;     /* Compression parameter index */
  41 };
  42
  43 /* well-known algorithm number (in CPI), from RFC2409 */
  44 #define IPCOMP_OUI      1       /* vendor specific */
  45 #define IPCOMP_DEFLATE  2       /* RFC2394 */
  46 #define IPCOMP_LZS      3       /* RFC2395 */
  47 #define IPCOMP_MAX      4
  48
  49 #define IPCOMP_CPI_NEGOTIATE_MIN        256
  50
  51 #if defined(KERNEL) || defined(_KERNEL)
  52 struct ipcomp_algorithm {
  53         int (*compress) __P((struct mbuf *, struct mbuf *, size_t *));
  54         int (*decompress) __P((struct mbuf *, struct mbuf *, size_t *));
  55         size_t minplen;         /* minimum required length for compression */
  56 };
  57
  58 struct ipsecrequest;
  59 extern struct ipcomp_algorithm ipcomp_algorithms[];
  60 extern void ipcomp4_input __P((struct mbuf *, int));
  61 extern int ipcomp4_output __P((struct mbuf *, struct ipsecrequest *));
  62 #if INET6
  63 extern int ipcomp6_input __P((struct mbuf **, int *));
  64 extern int ipcomp6_output __P((struct mbuf *, u_char *, struct mbuf *,
  65         struct ipsecrequest *));
  66 #endif
  67 #endif /*KERNEL*/
  68
  69 #endif /*_NETINET6_IPCOMP_H_*/