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/*
* $Id: libnet_build_ipsec.c,v 1.12 2004/04/13 17:32:28 mike Exp $
*
* libnet
* libnet_build_ipsec.c - IP packet assembler
*
* Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
* Copyright (c) 2002 Jose Nazario <jose@crimelabs.net>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
*/
#include "common.h"
libnet_ptag_t
libnet_build_ipsec_esp_hdr(uint32_t spi, uint32_t seq, uint32_t iv,
const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_esp_hdr esp_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_IPSEC_ESP_HDR_H + payload_s;/* size of memory block */
h = 0;
memset(&esp_hdr, 0, sizeof(esp_hdr));
esp_hdr.esp_spi = htonl(spi); /* SPI */
esp_hdr.esp_seq = htonl(seq); /* ESP sequence number */
esp_hdr.esp_iv = htonl(iv); /* initialization vector */
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_IPSEC_ESP_HDR_H);
if (p == NULL)
{
return (-1);
}
if (libnet_pblock_append(l, p, (uint8_t *)&esp_hdr, LIBNET_IPSEC_ESP_HDR_H) == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h,
LIBNET_PBLOCK_IPSEC_ESP_HDR_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_ipsec_esp_ftr(uint8_t len, uint8_t nh, int8_t *auth,
const uint8_t *payload, uint32_t payload_s, libnet_t *l,
libnet_ptag_t ptag)
{
/* XXX we need to know the size of auth */
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_esp_ftr esp_ftr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_IPSEC_ESP_FTR_H + payload_s;/* size of memory block */
h = 0;
memset(&esp_ftr, 0, sizeof(esp_ftr));
esp_ftr.esp_pad_len = len; /* pad length */
esp_ftr.esp_nh = nh; /* next header pointer */
esp_ftr.esp_auth = auth; /* authentication data */
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_IPSEC_ESP_FTR_H);
if (p == NULL)
{
return (-1);
}
if (libnet_pblock_append(l, p, (uint8_t *)&esp_ftr,
LIBNET_IPSEC_ESP_FTR_H) == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h,
LIBNET_PBLOCK_IPSEC_ESP_FTR_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_ipsec_ah(uint8_t nh, uint8_t len, uint16_t res,
uint32_t spi, uint32_t seq, uint32_t auth, const uint8_t *payload,
uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_ah_hdr ah_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_IPSEC_AH_H + payload_s;/* size of memory block */
h = 0;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_IPSEC_AH_H);
if (p == NULL)
{
return (-1);
}
memset(&ah_hdr, 0, sizeof(ah_hdr));
ah_hdr.ah_nh = nh; /* next header */
ah_hdr.ah_len = len; /* length */
ah_hdr.ah_res = (res ? htons(res) : 0);
ah_hdr.ah_spi = htonl(spi); /* SPI */
ah_hdr.ah_seq = htonl(seq); /* AH sequence number */
ah_hdr.ah_auth = htonl(auth); /* authentication data */
if (libnet_pblock_append(l, p, (uint8_t *)&ah_hdr, LIBNET_IPSEC_AH_H) == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h,
LIBNET_PBLOCK_IPSEC_AH_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
/**
* Local Variables:
* indent-tabs-mode: nil
* c-file-style: "stroustrup"
* End:
*/
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