sys/netinet6/esp.h

   1 /*      $NetBSD: esp.h,v 1.25 2008/04/24 11:38:38 ad 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 #if defined(_KERNEL_OPT)
  41 #include "opt_inet.h"
  42 #endif
  43
  44 struct esp {
  45         u_int32_t       esp_spi;        /* ESP */
  46         /* variable size, 32bit bound */        /* Initialization Vector */
  47         /* variable size */             /* Payload data */
  48         /* variable size */             /* padding */
  49         /* 8bit */                      /* pad size */
  50         /* 8bit */                      /* next header */
  51         /* variable size, 32bit bound */ /* Authentication data (new IPsec) */
  52 };
  53
  54 struct newesp {
  55         u_int32_t       esp_spi;        /* ESP */
  56         u_int32_t       esp_seq;        /* Sequence number */
  57         /* variable size */             /* (IV and) Payload data */
  58         /* variable size */             /* padding */
  59         /* 8bit */                      /* pad size */
  60         /* 8bit */                      /* next header */
  61         /* variable size, 32bit bound *//* Authentication data */
  62 };
  63
  64 struct esptail {
  65         u_int8_t        esp_padlen;     /* pad length */
  66         u_int8_t        esp_nxt;        /* Next header */
  67         /* variable size, 32bit bound *//* Authentication data (new IPsec)*/
  68 };
  69
  70 #ifdef _KERNEL
  71 struct secasvar;
  72
  73 struct esp_algorithm {
  74         size_t padbound;        /* pad boundary, in byte */
  75         int ivlenval;           /* iv length, in byte */
  76         int (*mature)(struct secasvar *);
  77         int keymin;     /* in bits */
  78         int keymax;     /* in bits */
  79         size_t (*schedlen)(const struct esp_algorithm *);
  80         const char *name;
  81         int (*ivlen)(const struct esp_algorithm *, struct secasvar *);
  82         int (*decrypt)(struct mbuf *, size_t,
  83                 struct secasvar *, const struct esp_algorithm *, int);
  84         int (*encrypt)(struct mbuf *, size_t, size_t,
  85                 struct secasvar *, const struct esp_algorithm *, int);
  86         /* not supposed to be called directly */
  87         int (*schedule)(const struct esp_algorithm *, struct secasvar *);
  88         int (*blockdecrypt)(const struct esp_algorithm *,
  89                 struct secasvar *, u_int8_t *, u_int8_t *);
  90         int (*blockencrypt)(const struct esp_algorithm *,
  91                 struct secasvar *, u_int8_t *, u_int8_t *);
  92 };
  93
  94 extern const struct esp_algorithm *esp_algorithm_lookup(int);
  95 extern int esp_max_padbound(void);
  96 extern int esp_max_ivlen(void);
  97
  98 /* crypt routines */
  99 extern int esp4_output(struct mbuf *, struct ipsecrequest *);
 100 extern void esp4_input(struct mbuf *, ...);
 101 extern size_t esp_hdrsiz(struct ipsecrequest *);
 102
 103 extern void esp4_init(void);
 104 extern void *esp4_ctlinput(int, const struct sockaddr *, void *);
 105
 106 #ifdef INET6
 107 extern int esp6_output(struct mbuf *, u_char *, struct mbuf *,
 108         struct ipsecrequest *);
 109 extern int esp6_input(struct mbuf **, int *, int);
 110
 111 extern void esp6_init(void);
 112 extern void *esp6_ctlinput(int, const struct sockaddr *, void *);
 113 #endif /* INET6 */
 114
 115 extern int esp_schedule(const struct esp_algorithm *, struct secasvar *);
 116 extern int esp_auth(struct mbuf *, size_t, size_t,
 117         struct secasvar *, u_char *);
 118 #endif /* _KERNEL */
 119
 120 #endif /* !_NETINET6_ESP_H_ */