sys/netinet6/ah.h

   1 /*      $NetBSD: ah.h,v 1.25 2008/04/24 11:38:38 ad Exp $       */
   2 /*      $KAME: ah.h,v 1.16 2001/09/04 08:43:19 itojun Exp $     */
   3
   4 /*
   5  * Copyright (C) 1995, 1996, 1997, and 1998 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  * RFC1826/2402 authentication header.
  35  */
  36
  37 #ifndef _NETINET6_AH_H_
  38 #define _NETINET6_AH_H_
  39
  40 #if defined(_KERNEL_OPT)
  41 #include "opt_inet.h"
  42 #endif
  43
  44 struct ah {
  45         u_int8_t        ah_nxt;         /* Next Header */
  46         u_int8_t        ah_len;         /* Length of data, in 32bit */
  47         u_int16_t       ah_reserve;     /* Reserved for future use */
  48         u_int32_t       ah_spi;         /* Security parameter index */
  49         /* variable size, 32bit bound*/ /* Authentication data */
  50 };
  51
  52 struct newah {
  53         u_int8_t        ah_nxt;         /* Next Header */
  54         u_int8_t        ah_len;         /* Length of data + 1, in 32bit */
  55         u_int16_t       ah_reserve;     /* Reserved for future use */
  56         u_int32_t       ah_spi;         /* Security parameter index */
  57         u_int32_t       ah_seq;         /* Sequence number field */
  58         /* variable size, 32bit bound*/ /* Authentication data */
  59 };
  60
  61 #ifdef _KERNEL
  62 struct secasvar;
  63
  64 struct ah_algorithm_state {
  65         struct secasvar *sav;
  66         void* foo;      /* per algorithm data - maybe */
  67 };
  68
  69 struct ah_algorithm {
  70         int (*sumsiz)(struct secasvar *);
  71         int (*mature)(struct secasvar *);
  72         int keymin;     /* in bits */
  73         int keymax;     /* in bits */
  74         const char *name;
  75         int (*init)(struct ah_algorithm_state *, struct secasvar *);
  76         void (*update)(struct ah_algorithm_state *, u_int8_t *, size_t);
  77         void (*result)(struct ah_algorithm_state *, u_int8_t *, size_t);
  78 };
  79
  80 #define AH_MAXSUMSIZE   (512 / 8)
  81
  82 extern const struct ah_algorithm *ah_algorithm_lookup(int);
  83
  84 /* cksum routines */
  85 extern int ah_hdrlen(struct secasvar *);
  86
  87 extern size_t ah_hdrsiz(struct ipsecrequest *);
  88 extern void ah4_input(struct mbuf *, ...);
  89 extern int ah4_output(struct mbuf *, struct ipsecrequest *);
  90 extern int ah4_calccksum(struct mbuf *, u_int8_t *, size_t,
  91         const struct ah_algorithm *, struct secasvar *);
  92
  93 extern void ah4_init(void);
  94 extern void *ah4_ctlinput(int, const struct sockaddr *, void *);
  95
  96 #ifdef INET6
  97 extern int ah6_input(struct mbuf **, int *, int);
  98 extern int ah6_output(struct mbuf *, u_char *, struct mbuf *,
  99         struct ipsecrequest *);
 100 extern int ah6_calccksum(struct mbuf *, u_int8_t *, size_t,
 101         const struct ah_algorithm *, struct secasvar *);
 102
 103 extern void ah6_init(void);
 104 extern void *ah6_ctlinput(int, const struct sockaddr *, void *);
 105 #endif /* INET6 */
 106
 107 #endif /* _KERNEL */
 108
 109 #endif /* !_NETINET6_AH_H_ */