/*      $NetBSD: esp.h,v 1.4 2018/04/19 08:27:38 maxv Exp $     */
/*      $FreeBSD: esp.h,v 1.1.4.1 2003/01/24 05:11:35 sam Exp $ */
/*      $KAME: esp.h,v 1.16 2000/10/18 21:28:00 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.
*/

/*
* RFC1827/2406 Encapsulated Security Payload.
*/

#ifndef _NETIPSEC_ESP_H_
#define _NETIPSEC_ESP_H_

struct esp {
       u_int32_t       esp_spi;        /* ESP */
       /*variable size, 32bit bound*/  /* Initialization Vector */
       /*variable size*/               /* Payload data */
       /*variable size*/               /* padding */
       /*8bit*/                        /* pad size */
       /*8bit*/                        /* next header */
       /*8bit*/                        /* next header */
       /*variable size, 32bit bound*/  /* Authentication data (new IPsec) */
};

struct newesp {
       u_int32_t       esp_spi;        /* ESP */
       u_int32_t       esp_seq;        /* Sequence number */
       /*variable size*/               /* (IV and) Payload data */
       /*variable size*/               /* padding */
       /*8bit*/                        /* pad size */
       /*8bit*/                        /* next header */
       /*8bit*/                        /* next header */
       /*variable size, 32bit bound*/  /* Authentication data */
};

struct esptail {
       u_int8_t        esp_padlen;     /* pad length */
       u_int8_t        esp_nxt;        /* Next header */
       /*variable size, 32bit bound*/  /* Authentication data (new IPsec)*/
};

#define ESP_ALEN        12      /* 96-bit authenticator */
#endif /* !_NETIPSEC_ESP_H_ */