* $Id: libnet_build_mpls.c,v 1.19 2005/11/29 22:55:14 carlosc Exp $
* libnet_build_mpls.c - MPLS packet assembler
* Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 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
#include "../include/config.h"
#if (!(_WIN32) || (__CYGWIN__))
#include "../include/libnet.h"
#include "../include/win32/libnet.h"
libnet_build_mpls(u_int32_t label
, u_int8_t experimental
, u_int8_t bos
,
u_int8_t ttl
, u_int8_t
*payload
, u_int32_t payload_s
, libnet_t
*l
,
struct libnet_mpls_hdr mpls_hdr
;
n
= LIBNET_MPLS_H
+ payload_s
;
* Find the existing protocol block if a ptag is specified, or create
p
= libnet_pblock_probe(l
, ptag
, n
, LIBNET_PBLOCK_MPLS_H
);
memset(&mpls_hdr
, 0, sizeof(mpls_hdr
));
mpls_hdr
.mpls_les
= htonl((((label
& 0x000fffff) << 12) |
((experimental
& 0x07) << 9) |
n
= libnet_pblock_append(l
, p
, (u_int8_t
*)&mpls_hdr
, LIBNET_MPLS_H
);
if ((payload
&& !payload_s
) || (!payload
&& payload_s
))
snprintf(l
->err_buf
, LIBNET_ERRBUF_SIZE
,
"%s(): payload inconsistency\n", __func__
);
if (payload
&& payload_s
)
n
= libnet_pblock_append(l
, p
, payload
, payload_s
);
* 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.
return (ptag
? ptag
: libnet_pblock_update(l
, p
, h
, LIBNET_PBLOCK_MPLS_H
));
libnet_pblock_delete(l
, p
);