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/*
* $Id: libnet_build_mpls.c,v 1.10 2004/04/13 17:32:28 mike Exp $
*
* libnet
* libnet_build_mpls.c - MPLS packet assembler
*
* Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
* 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_mpls(uint32_t label, uint8_t experimental, uint8_t bos,
uint8_t ttl, 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_mpls_hdr mpls_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_MPLS_H + payload_s;
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_MPLS_H);
if (p == NULL)
{
return (-1);
}
memset(&mpls_hdr, 0, sizeof(mpls_hdr));
mpls_hdr.mpls_les = htonl((((label & 0x000fffff) << 12) |
((experimental & 0x07) << 9) |
((bos & 0x01) << 8) |
((ttl & 0xff))));
n = libnet_pblock_append(l, p, (uint8_t *)&mpls_hdr, LIBNET_MPLS_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
/*
* The link offset is actually 4 bytes further into the header than
* before (the MPLS header adds this 4 bytes). We need to update the
* link offset pointer. XXX - should we set this here?
* Probably not. We should make pblock_coalesce check the pblock type
* and adjust accordingly.
*/
l->link_offset += 4;
return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_MPLS_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
/* EOF */
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