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      1 /* @(#) $Header: /tcpdump/master/tcpdump/mpls.h,v 1.1 2004/06/14 14:47:58 hannes Exp $ (LBL)
      2  * Copyright (C) 2001 WIDE Project.  All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  * 3. Neither the name of the project nor the names of its contributors
     13  *    may be used to endorse or promote products derived from this software
     14  *    without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #define LABEL_MASK	0xfffff000
     30 #define LABEL_SHIFT	12
     31 #define	EXP_MASK	0x00000e00
     32 #define EXP_SHIFT	9
     33 #define	STACK_MASK	0x00000100
     34 #define STACK_SHIFT	8
     35 #define TTL_MASK	0x000000ff
     36 #define TTL_SHIFT	0
     37 
     38 #define MPLS_LABEL(x)	(((x) & LABEL_MASK) >> LABEL_SHIFT)
     39 #define MPLS_EXP(x)	(((x) & EXP_MASK) >> EXP_SHIFT)
     40 #define MPLS_STACK(x)	(((x) & STACK_MASK) >> STACK_SHIFT)
     41 #define MPLS_TTL(x)	(((x) & TTL_MASK) >> TTL_SHIFT)
     42