2 * Copyright (C) 2001 WIDE Project. All rights reserved.
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5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
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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.
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
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30 static const char rcsid[] _U_ =
31 "@(#) $Header: /tcpdump/master/tcpdump/print-mpls.c,v 1.14 2005-07-05 09:38:19 hannes Exp $ (LBL)";
38 #include <tcpdump-stdinc.h>
44 #include "addrtoname.h"
45 #include "interface.h"
46 #include "extract.h" /* must come after interface.h */
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",
57 enum mpls_packet_type {
65 * RFC3032: MPLS label stack encoding
68 mpls_print(const u_char *bp, u_int length)
71 u_int32_t label_entry;
72 u_int16_t label_stack_depth = 0;
73 enum mpls_packet_type pt = PT_UNKNOWN;
78 TCHECK2(*p, sizeof(label_entry));
79 label_entry = EXTRACT_32BITS(p);
81 (label_stack_depth && vflag) ? "\n\t" : " ",
82 MPLS_LABEL(label_entry));
85 MPLS_LABEL(label_entry) < sizeof(mpls_labelname) / sizeof(mpls_labelname[0]))
86 printf(" (%s)", mpls_labelname[MPLS_LABEL(label_entry)]);
87 printf(", exp %u", MPLS_EXP(label_entry));
88 if (MPLS_STACK(label_entry))
90 printf(", ttl %u)", MPLS_TTL(label_entry));
92 p += sizeof(label_entry);
93 } while (!MPLS_STACK(label_entry));
96 * Try to figure out the packet type.
98 switch (MPLS_LABEL(label_entry)) {
100 case 0: /* IPv4 explicit NULL label */
101 case 3: /* IPv4 implicit NULL label */
105 case 2: /* IPv6 explicit NULL label */
111 * Generally there's no indication of protocol in MPLS label
114 * However, draft-hsmit-isis-aal5mux-00.txt describes a
115 * technique for encapsulating IS-IS and IP traffic on the
116 * same ATM virtual circuit; you look at the first payload
117 * byte to determine the network layer protocol, based on
120 * 1) the first byte of an IP header is 0x45-0x4f
121 * for IPv4 and 0x60-0x6f for IPv6;
123 * 2) the first byte of an OSI CLNP packet is 0x81,
124 * the first byte of an OSI ES-IS packet is 0x82,
125 * and the first byte of an OSI IS-IS packet is
128 * so the network layer protocol can be inferred from the
129 * first byte of the packet, if the protocol is one of the
132 * Cisco sends control-plane traffic MPLS-encapsulated in
177 /* ok bail out - we did not figure out what it is*/
185 if (pt == PT_UNKNOWN) {
186 if (!suppress_default_print)
187 default_print(p, length - (p - bp));
197 ip_print(gndo, p, length - (p - bp));
202 ip6_print(gndo, p, length - (p - bp));
204 printf("IPv6, length: %u", length);
209 isoclns_print(p, length - (p - bp), length - (p - bp));
224 * c-style: whitesmith