125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
/*
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* Copyright (C) 2001 WIDE Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-mpls.c,v 1.2.4.1 2002/05/07 18:36:28 fenner Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "addrtoname.h"
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#include "interface.h"
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#include "extract.h" /* must come after interface.h */
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#define LABEL_MASK 0xfffff000
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#define LABEL_SHIFT 12
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#define EXP_MASK 0x00000e00
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#define EXP_SHIFT 9
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#define STACK_MASK 0x00000100
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#define STACK_SHIFT 8
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#define TTL_MASK 0x000000ff
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#define TTL_SHIFT 0
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#define MPLS_LABEL(x) (((x) & LABEL_MASK) >> LABEL_SHIFT)
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#define MPLS_EXP(x) (((x) & EXP_MASK) >> EXP_SHIFT)
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#define MPLS_STACK(x) (((x) & STACK_MASK) >> STACK_SHIFT)
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#define MPLS_TTL(x) (((x) & TTL_MASK) >> TTL_SHIFT)
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static const char *mpls_labelname[] = {
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/*0*/ "IPv4 explicit NULL", "router alert", "IPv6 explicit NULL",
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"implicit NULL", "rsvd",
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/*5*/ "rsvd", "rsvd", "rsvd", "rsvd", "rsvd",
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/*10*/ "rsvd", "rsvd", "rsvd", "rsvd", "rsvd",
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/*15*/ "rsvd",
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};
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/*
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* RFC3032: MPLS label stack encoding
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*/
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void
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mpls_print(const u_char *bp, u_int length)
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{
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const u_char *p;
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u_int32_t v;
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p = bp;
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printf("MPLS");
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do {
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TCHECK2(*p, sizeof(v));
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v = EXTRACT_32BITS(p);
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printf(" ("); /*)*/
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printf("label 0x%x", MPLS_LABEL(v));
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if (vflag &&
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MPLS_LABEL(v) < sizeof(mpls_labelname) / sizeof(mpls_labelname[0]))
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printf("(%s)", mpls_labelname[MPLS_LABEL(v)]);
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if (MPLS_EXP(v))
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printf(" exp 0x%x", MPLS_EXP(v));
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if (MPLS_STACK(v))
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printf("[S]");
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printf(" TTL %u", MPLS_TTL(v));
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/*(*/
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printf(")");
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p += sizeof(v);
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} while (!MPLS_STACK(v));
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switch (MPLS_LABEL(v)) {
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case 0: /* IPv4 explicit NULL label */
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ip_print(p, length - (p - bp));
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break;
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#ifdef INET6
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case 2: /* IPv6 explicit NULL label */
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ip6_print(p, length - (p - bp));
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break;
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#endif
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default:
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/*
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* Since there's no indication of protocol in MPLS label
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* encoding, we can print nothing further.
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*/
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return;
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}
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trunc:
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printf("[|MPLS]");
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}
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