sys/netinet6/esp.h

   1 /*      $FreeBSD: src/sys/netinet6/esp.h,v 1.8 2005/01/07 02:30:34 imp Exp $    */
   2 /*      $KAME: esp.h,v 1.19 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  * RFC1827/2406 Encapsulated Security Payload.
  35  */
  36
  37 #ifndef _NETINET6_ESP_H_
  38 #define _NETINET6_ESP_H_
  39
  40 #ifndef _SYS_TYPES_H_
  41 #include <sys/types.h>
  42 #endif
  43
  44 #if defined(_KERNEL) && !defined(_LKM)
  45 #include "opt_inet.h"
  46 #endif
  47
  48 struct esp {
  49         u_int32_t       esp_spi;        /* ESP */
  50         /* variable size, 32bit bound */        /* Initialization Vector */
  51         /* variable size */             /* Payload data */
  52         /* variable size */             /* padding */
  53         /* 8bit */                      /* pad size */
  54         /* 8bit */                      /* next header */
  55         /* variable size, 32bit bound */ /* Authentication data (new IPsec) */
  56 };
  57
  58 struct newesp {
  59         u_int32_t       esp_spi;        /* ESP */
  60         u_int32_t       esp_seq;        /* Sequence number */
  61         /* variable size */             /* (IV and) Payload data */
  62         /* variable size */             /* padding */
  63         /* 8bit */                      /* pad size */
  64         /* 8bit */                      /* next header */
  65         /* variable size, 32bit bound *//* Authentication data */
  66 };
  67
  68 struct esptail {
  69         u_int8_t        esp_padlen;     /* pad length */
  70         u_int8_t        esp_nxt;        /* Next header */
  71         /* variable size, 32bit bound *//* Authentication data (new IPsec)*/
  72 };
  73
  74 #ifdef _KERNEL
  75
  76 struct secasvar;
  77
  78 struct esp_algorithm {
  79         size_t padbound;        /* pad boundary, in byte */
  80         int ivlenval;           /* iv length, in byte */
  81         int (*mature) (struct secasvar *);
  82         int keymin;     /* in bits */
  83         int keymax;     /* in bits */
  84         size_t (*schedlen) (const struct esp_algorithm *);
  85         const char *name;
  86         int (*ivlen) (const struct esp_algorithm *, struct secasvar *);
  87         int (*decrypt) (struct mbuf *, size_t,
  88                 struct secasvar *, const struct esp_algorithm *, int);
  89         int (*encrypt) (struct mbuf *, size_t, size_t,
  90                 struct secasvar *, const struct esp_algorithm *, int);
  91         /* not supposed to be called directly */
  92         int (*schedule) (const struct esp_algorithm *, struct secasvar *);
  93         int (*blockdecrypt) (const struct esp_algorithm *,
  94                 struct secasvar *, u_int8_t *, u_int8_t *);
  95         int (*blockencrypt) (const struct esp_algorithm *,
  96                 struct secasvar *, u_int8_t *, u_int8_t *);
  97 };
  98
  99 extern const struct esp_algorithm *esp_algorithm_lookup (int);
 100 extern int esp_max_ivlen (void);
 101
 102 /* crypt routines */
 103 extern int esp4_output (struct mbuf *, struct ipsecrequest *);
 104 extern int esp4_input(struct mbuf **, int *, int);
 105 extern size_t esp_hdrsiz (struct ipsecrequest *);
 106
 107 extern int esp_schedule (const struct esp_algorithm *, struct secasvar *);
 108 extern int esp_auth (struct mbuf *, size_t, size_t,
 109         struct secasvar *, u_char *);
 110 #endif /* _KERNEL */
 111
 112 #endif /* _NETINET6_ESP_H_ */