/*
* $Id: libnet_build_bgp.c,v 1.8 2004/04/13 17:32:28 mike Exp $
*
* libnet
* libnet_build_bgp.c - BGP packet assembler (RFC 1771)
*
* Copyright (c) 2003 Frederic Raynal <pappy@security-labs.org>
* 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.
*
*/
#if (HAVE_CONFIG_H)
#include "../include/config.h"
#endif
#if (!(_WIN32) || (__CYGWIN__))
#include "../include/libnet.h"
#else
#include "../include/win32/libnet.h"
#endif
libnet_ptag_t
libnet_build_bgp4_header(uint8_t marker[LIBNET_BGP4_MARKER_SIZE],
uint16_t len, uint8_t type, 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_bgp4_header_hdr bgp4_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_BGP4_HEADER_H + payload_s; /* size of memory block */
h = 0; /* BGP headers have no checksum */
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_BGP4_HEADER_H);
if (p == NULL)
{
return (-1);
}
memset(&bgp4_hdr, 0, sizeof(bgp4_hdr));
memcpy(bgp4_hdr.marker, marker, LIBNET_BGP4_MARKER_SIZE * sizeof(uint8_t));
bgp4_hdr.len = htons(len);
bgp4_hdr.type = type;
n = libnet_pblock_append(l, p, (uint8_t *)&bgp4_hdr, LIBNET_BGP4_HEADER_H);
if (n == -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_BGP4_HEADER_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_bgp4_open(uint8_t version, uint16_t src_as, uint16_t hold_time,
uint32_t bgp_id, uint8_t opt_len, const uint8_t *payload, uint32_t payload_s,
libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
uint16_t val;
if (l == NULL)
{
return (-1);
}
n = LIBNET_BGP4_OPEN_H + payload_s; /* size of memory block */
h = 0; /* BGP msg have no checksum */
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_BGP4_OPEN_H);
if (p == NULL)
{
return (-1);
}
/* for memory alignment reason, we need to append each field separately */
n = libnet_pblock_append(l, p, (uint8_t *)&version, sizeof (version));
if (n == -1)
{
goto bad;
}
val = htons(src_as);
n = libnet_pblock_append(l, p, (uint8_t *)&val, sizeof(src_as));
if (n == -1)
{
goto bad;
}
val = htons(hold_time);
n = libnet_pblock_append(l, p, (uint8_t *)&val, sizeof(hold_time));
if (n == -1)
{
goto bad;
}
n = htonl(bgp_id);
n = libnet_pblock_append(l, p, (uint8_t *)&n, sizeof(bgp_id));
if (n == -1)
{
goto bad;
}
n = libnet_pblock_append(l, p, (uint8_t *)&opt_len, sizeof(opt_len));
if (n == -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_BGP4_OPEN_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_bgp4_update(uint16_t unfeasible_rt_len, const uint8_t *withdrawn_rt,
uint16_t total_path_attr_len, const uint8_t *path_attributes, uint16_t info_len,
uint8_t *reachability_info, const uint8_t *payload, uint32_t payload_s,
libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
uint16_t length;
if (l == NULL)
{
return (-1);
}
/* size of memory block */
n = LIBNET_BGP4_UPDATE_H + unfeasible_rt_len + total_path_attr_len +
info_len + payload_s;
/* BGP msg have no checksum */
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_BGP4_UPDATE_H);
if (p == NULL)
{
return (-1);
}
/* for memory alignment reason, we need to append each field separately */
length = htons(unfeasible_rt_len);
n = libnet_pblock_append(l, p, (uint8_t *)&length,
sizeof (unfeasible_rt_len));
if (n == -1)
{
goto bad;
}
if (unfeasible_rt_len && withdrawn_rt)
{
n = libnet_pblock_append(l, p, withdrawn_rt, unfeasible_rt_len);
if (n == -1)
{
goto bad;
}
}
length = htons(total_path_attr_len);
n = libnet_pblock_append(l, p, (uint8_t *)&length,
sizeof (total_path_attr_len));
if (n == -1)
{
goto bad;
}
if (total_path_attr_len && path_attributes)
{
n = libnet_pblock_append(l, p, path_attributes, total_path_attr_len);
if (n == -1)
{
goto bad;
}
}
if (info_len && reachability_info)
{
n = libnet_pblock_append(l, p, reachability_info, info_len);
if (n == -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_BGP4_UPDATE_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_bgp4_notification(uint8_t err_code, uint8_t err_subcode,
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_bgp4_notification_hdr bgp4_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_BGP4_NOTIFICATION_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_BGP4_NOTIFICATION_H);
if (p == NULL)
{
return (-1);
}
memset(&bgp4_hdr, 0, sizeof(bgp4_hdr));
bgp4_hdr.err_code = err_code;
bgp4_hdr.err_subcode = err_subcode;
n = libnet_pblock_append(l, p, (uint8_t *)&bgp4_hdr,
LIBNET_BGP4_NOTIFICATION_H);
if (n == -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_BGP4_NOTIFICATION_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
/* EOF */