2002-06-21 00:43:23 +00:00
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/*
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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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2017-01-31 19:17:06 +00:00
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/* \summary: Multi-Protocol Label Switching (MPLS) printer */
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2002-06-21 00:43:23 +00:00
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#ifdef HAVE_CONFIG_H
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2023-05-10 15:02:34 +00:00
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#include <config.h>
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2002-06-21 00:43:23 +00:00
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#endif
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2023-05-10 15:02:34 +00:00
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#include "netdissect-stdinc.h"
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2002-06-21 00:43:23 +00:00
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2023-05-10 15:02:34 +00:00
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#define ND_LONGJMP_FROM_TCHECK
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2017-01-31 19:17:06 +00:00
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#include "netdissect.h"
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#include "extract.h"
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2005-05-29 18:17:16 +00:00
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#include "mpls.h"
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2002-06-21 00:43:23 +00:00
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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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2012-05-14 08:01:48 +00:00
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enum mpls_packet_type {
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PT_UNKNOWN,
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PT_IPV4,
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PT_IPV6,
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PT_OSI
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};
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2002-06-21 00:43:23 +00:00
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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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2015-01-06 19:03:11 +00:00
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mpls_print(netdissect_options *ndo, const u_char *bp, u_int length)
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2002-06-21 00:43:23 +00:00
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{
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const u_char *p;
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2015-01-06 19:03:11 +00:00
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uint32_t label_entry;
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uint16_t label_stack_depth = 0;
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2023-05-10 15:02:34 +00:00
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uint8_t first;
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2012-05-14 08:01:48 +00:00
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enum mpls_packet_type pt = PT_UNKNOWN;
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2002-06-21 00:43:23 +00:00
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2023-05-10 15:02:34 +00:00
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ndo->ndo_protocol = "mpls";
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2002-06-21 00:43:23 +00:00
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p = bp;
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2023-05-10 15:02:34 +00:00
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nd_print_protocol_caps(ndo);
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2003-03-02 08:22:26 +00:00
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do {
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2023-05-10 15:02:34 +00:00
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if (length < sizeof(label_entry))
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goto invalid;
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label_entry = GET_BE_U_4(p);
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ND_PRINT("%s(label %u",
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2015-01-06 19:03:11 +00:00
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(label_stack_depth && ndo->ndo_vflag) ? "\n\t" : " ",
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2023-05-10 15:02:34 +00:00
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MPLS_LABEL(label_entry));
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2012-05-14 08:01:48 +00:00
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label_stack_depth++;
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2015-01-06 19:03:11 +00:00
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if (ndo->ndo_vflag &&
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2005-07-11 03:54:22 +00:00
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MPLS_LABEL(label_entry) < sizeof(mpls_labelname) / sizeof(mpls_labelname[0]))
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2023-05-10 15:02:34 +00:00
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ND_PRINT(" (%s)", mpls_labelname[MPLS_LABEL(label_entry)]);
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ND_PRINT(", tc %u", MPLS_TC(label_entry));
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2005-07-11 03:54:22 +00:00
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if (MPLS_STACK(label_entry))
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2023-05-10 15:02:34 +00:00
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ND_PRINT(", [S]");
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ND_PRINT(", ttl %u)", MPLS_TTL(label_entry));
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2002-06-21 00:43:23 +00:00
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2005-07-11 03:54:22 +00:00
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p += sizeof(label_entry);
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2017-01-31 19:17:06 +00:00
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length -= sizeof(label_entry);
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2005-07-11 03:54:22 +00:00
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} while (!MPLS_STACK(label_entry));
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2002-06-21 00:43:23 +00:00
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2012-05-14 08:01:48 +00:00
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/*
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* Try to figure out the packet type.
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*/
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2005-07-11 03:54:22 +00:00
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switch (MPLS_LABEL(label_entry)) {
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2012-05-14 08:01:48 +00:00
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2002-06-21 00:43:23 +00:00
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case 0: /* IPv4 explicit NULL label */
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2012-05-14 08:01:48 +00:00
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case 3: /* IPv4 implicit NULL label */
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pt = PT_IPV4;
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2002-06-21 00:43:23 +00:00
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break;
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2012-05-14 08:01:48 +00:00
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2002-06-21 00:43:23 +00:00
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case 2: /* IPv6 explicit NULL label */
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2012-05-14 08:01:48 +00:00
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pt = PT_IPV6;
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2002-06-21 00:43:23 +00:00
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break;
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2012-05-14 08:01:48 +00:00
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2002-06-21 00:43:23 +00:00
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default:
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/*
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2004-03-31 09:17:26 +00:00
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* Generally there's no indication of protocol in MPLS label
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2012-05-14 08:01:48 +00:00
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* encoding.
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*
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* However, draft-hsmit-isis-aal5mux-00.txt describes a
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* technique for encapsulating IS-IS and IP traffic on the
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* same ATM virtual circuit; you look at the first payload
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* byte to determine the network layer protocol, based on
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* the fact that
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*
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* 1) the first byte of an IP header is 0x45-0x4f
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* for IPv4 and 0x60-0x6f for IPv6;
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*
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* 2) the first byte of an OSI CLNP packet is 0x81,
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* the first byte of an OSI ES-IS packet is 0x82,
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* and the first byte of an OSI IS-IS packet is
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* 0x83;
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*
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* so the network layer protocol can be inferred from the
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* first byte of the packet, if the protocol is one of the
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* ones listed above.
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*
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* Cisco sends control-plane traffic MPLS-encapsulated in
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* this fashion.
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2002-06-21 00:43:23 +00:00
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*/
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2017-01-31 19:17:06 +00:00
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if (length < 1) {
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/* nothing to print */
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return;
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}
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2023-05-10 15:02:34 +00:00
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first = GET_U_1(p);
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pt =
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(first >= 0x45 && first <= 0x4f) ? PT_IPV4 :
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(first >= 0x60 && first <= 0x6f) ? PT_IPV6 :
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(first >= 0x81 && first <= 0x83) ? PT_OSI :
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2012-05-14 08:01:48 +00:00
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/* ok bail out - we did not figure out what it is*/
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2023-05-10 15:02:34 +00:00
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PT_UNKNOWN;
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2012-05-14 08:01:48 +00:00
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}
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2004-03-31 09:17:26 +00:00
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2012-05-14 08:01:48 +00:00
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/*
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* Print the payload.
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*/
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2023-05-10 15:02:34 +00:00
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switch (pt) {
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case PT_UNKNOWN:
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2015-01-06 19:03:11 +00:00
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if (!ndo->ndo_suppress_default_print)
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2017-01-31 19:17:06 +00:00
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ND_DEFAULTPRINT(p, length);
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2023-05-10 15:02:34 +00:00
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break;
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2012-05-14 08:01:48 +00:00
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case PT_IPV4:
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2023-05-10 15:02:34 +00:00
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ND_PRINT(ndo->ndo_vflag ? "\n\t" : " ");
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2017-01-31 19:17:06 +00:00
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ip_print(ndo, p, length);
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2012-05-14 08:01:48 +00:00
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break;
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case PT_IPV6:
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2023-05-10 15:02:34 +00:00
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ND_PRINT(ndo->ndo_vflag ? "\n\t" : " ");
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2017-01-31 19:17:06 +00:00
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ip6_print(ndo, p, length);
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2012-05-14 08:01:48 +00:00
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break;
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case PT_OSI:
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2023-05-10 15:02:34 +00:00
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ND_PRINT(ndo->ndo_vflag ? "\n\t" : " ");
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2017-09-18 04:10:54 +00:00
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isoclns_print(ndo, p, length);
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2012-05-14 08:01:48 +00:00
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break;
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2002-06-21 00:43:23 +00:00
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}
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2012-05-14 08:01:48 +00:00
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return;
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2002-06-21 00:43:23 +00:00
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2023-05-10 15:02:34 +00:00
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invalid:
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nd_print_invalid(ndo);
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ND_TCHECK_LEN(p, length);
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2002-06-21 00:43:23 +00:00
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}
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