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	1	/*
	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	#ifndef lint
	30	static const char rcsid[] _U_ =
	31	"@(#) $Header: /tcpdump/master/tcpdump/print-mpls.c,v 1.13.2.1 2005/07/05 09:39:29 hannes Exp $ (LBL)";
	32	#endif
	33
	34	#ifdef HAVE_CONFIG_H
	35	#include "config.h"
	36	#endif
	37
	38	#include <tcpdump-stdinc.h>
	39
	40	#include <stdio.h>
	41	#include <stdlib.h>
	42	#include <string.h>
	43
	44	#include "addrtoname.h"
	45	#include "interface.h"
	46	#include "extract.h" /* must come after interface.h */
	47	#include "mpls.h"
	48
	49	static const char *mpls_labelname[] = {
	50	/0/ "IPv4 explicit NULL", "router alert", "IPv6 explicit NULL",
	51	"implicit NULL", "rsvd",
	52	/5/ "rsvd", "rsvd", "rsvd", "rsvd", "rsvd",
	53	/10/ "rsvd", "rsvd", "rsvd", "rsvd", "rsvd",
	54	/15/ "rsvd",
	55	};
	56
	57	/*
	58	* RFC3032: MPLS label stack encoding
	59	*/
	60	void
	61	mpls_print(const u_char *bp, u_int length)
	62	{
	63	const u_char *p;
	64	u_int32_t label_entry;
	65	u_int16_t label_stack_depth = 0;
	66
	67	p = bp;
	68	printf("MPLS");
	69	do {
	70	TCHECK2(*p, sizeof(label_entry));
	71	label_entry = EXTRACT_32BITS(p);
	72	printf("%s(label %u",
	73	label_stack_depth ? "\n\t" : " ",
	74	MPLS_LABEL(label_entry));
	75	label_stack_depth++;
	76	if (vflag &&
	77	MPLS_LABEL(label_entry) < sizeof(mpls_labelname) / sizeof(mpls_labelname[0]))
	78	printf(" (%s)", mpls_labelname[MPLS_LABEL(label_entry)]);
	79	printf(", exp %u", MPLS_EXP(label_entry));
	80	if (MPLS_STACK(label_entry))
	81	printf(", [S]");
	82	printf(", ttl %u)", MPLS_TTL(label_entry));
	83
	84	p += sizeof(label_entry);
	85	} while (!MPLS_STACK(label_entry));
	86
	87	switch (MPLS_LABEL(label_entry)) {
	88	case 0: /* IPv4 explicit NULL label */
	89	case 3: /* IPv4 implicit NULL label */
	90	if (vflag>0) {
	91	printf("\n\t");
	92	ip_print(gndo, p, length - (p - bp));
	93	}
	94	else printf(", IP, length: %u",length);
	95	break;
	96	#ifdef INET6
	97	case 2: /* IPv6 explicit NULL label */
	98	if (vflag>0) {
	99	printf("\n\t");
	100	ip6_print(p, length - (p - bp));
	101	}
	102	else printf(", IPv6, length: %u",length);
	103	break;
	104	#endif
	105	default:
	106	/*
	107	* Generally there's no indication of protocol in MPLS label
	108	* encoding, however draft-hsmit-isis-aal5mux-00.txt describes
	109	* a technique that looks at the first payload byte if the BOS (bottom of stack)
	110	* bit is set and tries to determine the network layer protocol
	111	* 0x45-0x4f is IPv4
	112	* 0x60-0x6f is IPv6
	113	* 0x81-0x83 is OSI (CLNP,ES-IS,IS-IS)
	114	* this technique is sometimes known as NULL encapsulation
	115	* and decoding is particularly useful for control-plane traffic [BGP]
	116	* which cisco by default sends MPLS encapsulated
	117	*/
	118
	119	if (MPLS_STACK(label_entry)) { /* only do this if the stack bit is set */
	120	switch(*p) {
	121	case 0x45:
	122	case 0x46:
	123	case 0x47:
	124	case 0x48:
	125	case 0x49:
	126	case 0x4a:
	127	case 0x4b:
	128	case 0x4c:
	129	case 0x4d:
	130	case 0x4e:
	131	case 0x4f:
	132	if (vflag>0) {
	133	printf("\n\t");
	134	ip_print(gndo, p, length - (p - bp));
	135	}
	136	else printf(", IP, length: %u",length);
	137	break;
	138	#ifdef INET6
	139	case 0x60:
	140	case 0x61:
	141	case 0x62:
	142	case 0x63:
	143	case 0x64:
	144	case 0x65:
	145	case 0x66:
	146	case 0x67:
	147	case 0x68:
	148	case 0x69:
	149	case 0x6a:
	150	case 0x6b:
	151	case 0x6c:
	152	case 0x6d:
	153	case 0x6e:
	154	case 0x6f:
	155	if (vflag>0) {
	156	printf("\n\t");
	157	ip6_print(p, length - (p - bp));
	158	}
	159	else printf(", IPv6, length: %u",length);
	160	break;
	161	#endif
	162	case 0x81:
	163	case 0x82:
	164	case 0x83:
	165	if (vflag>0) {
	166	printf("\n\t");
	167	isoclns_print(p, length - (p - bp), length - (p - bp));
	168	}
	169	else printf(", OSI, length: %u",length);
	170	break;
	171	default:
	172	/* ok bail out - we did not figure out what it is*/
	173	break;
	174	}
	175	}
	176	return;
	177	}
	178
	179	trunc:
	180	printf("[\|MPLS]");
	181	}
	182
	183
	184	/*
	185	* Local Variables:
	186	* c-style: whitesmith
	187	* c-basic-offset: 8
	188	* End:
	189	*/