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

     /*      $NetBSD: ah.h,v 1.21 2003/08/05 12:20:35 itojun Exp $   */
     /*      $KAME: ah.h,v 1.16 2001/09/04 08:43:19 itojun Exp $     */
     
     /*
      * Copyright (C) 1995, 1996, 1997, and 1998 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.
     */
    
    /*
     * RFC1826/2402 authentication header.
     */
    
    #ifndef _NETINET6_AH_H_
    #define _NETINET6_AH_H_
    
    #if defined(_KERNEL_OPT)
    #include "opt_inet.h"
    #endif
    
    struct ah {
            u_int8_t        ah_nxt;         /* Next Header */
            u_int8_t        ah_len;         /* Length of data, in 32bit */
            u_int16_t       ah_reserve;     /* Reserved for future use */
            u_int32_t       ah_spi;         /* Security parameter index */
            /* variable size, 32bit bound*/ /* Authentication data */
    };
    
    struct newah {
            u_int8_t        ah_nxt;         /* Next Header */
            u_int8_t        ah_len;         /* Length of data + 1, in 32bit */
            u_int16_t       ah_reserve;     /* Reserved for future use */
            u_int32_t       ah_spi;         /* Security parameter index */
            u_int32_t       ah_seq;         /* Sequence number field */
            /* variable size, 32bit bound*/ /* Authentication data */
    };
    
    #ifdef _KERNEL
    struct secasvar;
    
    struct ah_algorithm_state {
            struct secasvar *sav;
            void* foo;      /* per algorithm data - maybe */
    };
    
    struct ah_algorithm {
            int (*sumsiz) __P((struct secasvar *));
            int (*mature) __P((struct secasvar *));
            int keymin;     /* in bits */
            int keymax;     /* in bits */
            const char *name;
            int (*init) __P((struct ah_algorithm_state *, struct secasvar *));
            void (*update) __P((struct ah_algorithm_state *, u_int8_t *, size_t));
            void (*result) __P((struct ah_algorithm_state *, u_int8_t *, size_t));
    };
    
    #define AH_MAXSUMSIZE   (512 / 8)
    
    extern const struct ah_algorithm *ah_algorithm_lookup __P((int));
    
    /* cksum routines */
    extern int ah_hdrlen __P((struct secasvar *));
    
    extern size_t ah_hdrsiz __P((struct ipsecrequest *));
    extern void ah4_input __P((struct mbuf *, ...));
    extern int ah4_output __P((struct mbuf *, struct ipsecrequest *));
    extern int ah4_calccksum __P((struct mbuf *, u_int8_t *, size_t,
            const struct ah_algorithm *, struct secasvar *));
    
    extern void *ah4_ctlinput __P((int, struct sockaddr *, void *));
    
    #ifdef INET6
    extern int ah6_input __P((struct mbuf **, int *, int));
    extern int ah6_output __P((struct mbuf *, u_char *, struct mbuf *,
            struct ipsecrequest *));
    extern int ah6_calccksum __P((struct mbuf *, u_int8_t *, size_t,
           const struct ah_algorithm *, struct secasvar *));
   
   extern void ah6_ctlinput __P((int, struct sockaddr *, void *));
   #endif /* INET6 */
   
   #endif /* _KERNEL */
   
   #endif /* _NETINET6_AH_H_ */

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