mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-15 10:17:20 +00:00
125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char rcsid[] =
|
|
"@(#) $Header: /tcpdump/master/tcpdump/print-mpls.c,v 1.2.4.1 2002/05/07 18:36:28 fenner Exp $ (LBL)";
|
|
#endif
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/time.h>
|
|
#include <sys/socket.h>
|
|
|
|
#include <netinet/in.h>
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "addrtoname.h"
|
|
#include "interface.h"
|
|
#include "extract.h" /* must come after interface.h */
|
|
|
|
#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)
|
|
|
|
static const char *mpls_labelname[] = {
|
|
/*0*/ "IPv4 explicit NULL", "router alert", "IPv6 explicit NULL",
|
|
"implicit NULL", "rsvd",
|
|
/*5*/ "rsvd", "rsvd", "rsvd", "rsvd", "rsvd",
|
|
/*10*/ "rsvd", "rsvd", "rsvd", "rsvd", "rsvd",
|
|
/*15*/ "rsvd",
|
|
};
|
|
|
|
/*
|
|
* RFC3032: MPLS label stack encoding
|
|
*/
|
|
void
|
|
mpls_print(const u_char *bp, u_int length)
|
|
{
|
|
const u_char *p;
|
|
u_int32_t v;
|
|
|
|
p = bp;
|
|
printf("MPLS");
|
|
do {
|
|
TCHECK2(*p, sizeof(v));
|
|
v = EXTRACT_32BITS(p);
|
|
printf(" ("); /*)*/
|
|
printf("label 0x%x", MPLS_LABEL(v));
|
|
if (vflag &&
|
|
MPLS_LABEL(v) < sizeof(mpls_labelname) / sizeof(mpls_labelname[0]))
|
|
printf("(%s)", mpls_labelname[MPLS_LABEL(v)]);
|
|
if (MPLS_EXP(v))
|
|
printf(" exp 0x%x", MPLS_EXP(v));
|
|
if (MPLS_STACK(v))
|
|
printf("[S]");
|
|
printf(" TTL %u", MPLS_TTL(v));
|
|
/*(*/
|
|
printf(")");
|
|
|
|
p += sizeof(v);
|
|
} while (!MPLS_STACK(v));
|
|
|
|
switch (MPLS_LABEL(v)) {
|
|
case 0: /* IPv4 explicit NULL label */
|
|
ip_print(p, length - (p - bp));
|
|
break;
|
|
#ifdef INET6
|
|
case 2: /* IPv6 explicit NULL label */
|
|
ip6_print(p, length - (p - bp));
|
|
break;
|
|
#endif
|
|
default:
|
|
/*
|
|
* Since there's no indication of protocol in MPLS label
|
|
* encoding, we can print nothing further.
|
|
*/
|
|
return;
|
|
}
|
|
|
|
trunc:
|
|
printf("[|MPLS]");
|
|
}
|