FreeBSD/Linux Kernel Cross Reference
sys/netinet6/ipcomp.h

     /*      $NetBSD: ipcomp.h,v 1.10 2001/10/15 03:55:38 itojun Exp $       */
     /*      $KAME: ipcomp.h,v 1.11 2001/09/04 08:43:19 itojun Exp $ */
     
     /*
      * Copyright (C) 1999 WIDE Project.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the project nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    /*
     * RFC2393 IP payload compression protocol (IPComp).
     */
    
    #ifndef _NETINET6_IPCOMP_H_
    #define _NETINET6_IPCOMP_H_
    
    #if defined(_KERNEL_OPT)
    #include "opt_inet.h"
    #endif
    
    struct ipcomp {
            u_int8_t comp_nxt;      /* Next Header */
            u_int8_t comp_flags;    /* reserved, must be zero */
            u_int16_t comp_cpi;     /* Compression parameter index */
    };
    
    /* well-known algorithm number (in CPI), from RFC2409 */
    #define IPCOMP_OUI      1       /* vendor specific */
    #define IPCOMP_DEFLATE  2       /* RFC2394 */
    #define IPCOMP_LZS      3       /* RFC2395 */
    #define IPCOMP_MAX      4
    
    #define IPCOMP_CPI_NEGOTIATE_MIN        256
    
    #if defined(KERNEL) || defined(_KERNEL)
    struct ipcomp_algorithm {
            int (*compress) __P((struct mbuf *, struct mbuf *, size_t *));
            int (*decompress) __P((struct mbuf *, struct mbuf *, size_t *));
            size_t minplen;         /* minimum required length for compression */
    };
    
    struct ipsecrequest;
    extern const struct ipcomp_algorithm *ipcomp_algorithm_lookup __P((int));
    extern void ipcomp4_input __P((struct mbuf *, ...));
    extern int ipcomp4_output __P((struct mbuf *, struct ipsecrequest *));
    #ifdef INET6
    extern int ipcomp6_input __P((struct mbuf **, int *, int));
    extern int ipcomp6_output __P((struct mbuf *, u_char *, struct mbuf *,
            struct ipsecrequest *));
    #endif
    #endif /* KERNEL */
    
    #endif /* _NETINET6_IPCOMP_H_ */

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