mpls.h

TCPDUMP的C语言源代码,是在数据链路层的应用

/* @(#) $Header: /tcpdump/master/tcpdump/mpls.h,v 1.1 2004-06-14 14:47:58 hannes Exp $ (LBL)
 * Copyright (C) 2001 WIDE Project.  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.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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.
 */

#define LABEL_MASK	0xfffff000
#define LABEL_SHIFT	12
#define	EXP_MASK	0x00000e00
#define EXP_SHIFT	9
#define	STACK_MASK	0x00000100
#define STACK_SHIFT	8
#define TTL_MASK	0x000000ff
#define TTL_SHIFT	0

#define MPLS_LABEL(x)	(((x) & LABEL_MASK) >> LABEL_SHIFT)
#define MPLS_EXP(x)	(((x) & EXP_MASK) >> EXP_SHIFT)
#define MPLS_STACK(x)	(((x) & STACK_MASK) >> STACK_SHIFT)
#define MPLS_TTL(x)	(((x) & TTL_MASK) >> TTL_SHIFT)