sys/netinet6/ipcomp.h

   1 /*      $NetBSD: ipcomp.h,v 1.12 2007/11/01 20:33:58 dyoung 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_OPT)
  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 #if defined(KERNEL) || defined(_KERNEL)
  59 struct ipcomp_algorithm {
  60         int (*compress)(struct mbuf *, struct mbuf *, size_t *);
  61         int (*decompress)(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(int);
  67 extern void ipcomp4_init(void);
  68 extern void ipcomp4_input(struct mbuf *, ...);
  69 extern int ipcomp4_output(struct mbuf *, struct ipsecrequest *);
  70 #ifdef INET6
  71 extern void ipcomp6_init(void);
  72 extern int ipcomp6_input(struct mbuf **, int *, int);
  73 extern int ipcomp6_output(struct mbuf *, u_char *, struct mbuf *,
  74         struct ipsecrequest *);
  75 #endif
  76 #endif /* KERNEL */
  77
  78 #endif /* !_NETINET6_IPCOMP_H_ */