epan/dissectors/packet-mpls.h

   1 /* packet-mpls.h
   2  * Declarations of exported routines from MPLS dissector
   3  * Author: Carlos Pignataro <cpignata@cisco.com>
   4  * Copyright 2005, cisco Systems, Inc.
   5  *
   6  * (c) Copyright 2006, _FF_ Francesco Fondelli <francesco.fondelli@gmail.com>
   7  *                     added MPLS OAM support, ITU-T Y.1711
   8  * (c) Copyright 2011, Shobhank Sharma <ssharma5@ncsu.edu>
   9  *                     added MPLS Generic Associated Channel as per RFC 5586
  10  *
  11  * $Id$
  12  *
  13  * Wireshark - Network traffic analyzer
  14  * By Gerald Combs <gerald@wireshark.org>
  15  * Copyright 1998 Gerald Combs
  16  *
  17  * This program is free software; you can redistribute it and/or
  18  * modify it under the terms of the GNU General Public License
  19  * as published by the Free Software Foundation; either version 2
  20  * of the License, or (at your option) any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  30  */
  31
  32 #ifndef PACKET_MPLS_H
  33 #define PACKET_MPLS_H
  34
  35 /* Special labels in MPLS */
  36 enum {
  37     MPLS_LABEL_IP4_EXPLICIT_NULL = 0,
  38     MPLS_LABEL_ROUTER_ALERT,
  39     MPLS_LABEL_IP6_EXPLICIT_NULL,
  40     MPLS_LABEL_IMPLICIT_NULL,
  41     MPLS_LABEL_GACH              = 13, /* aka GAL */
  42     MPLS_LABEL_OAM_ALERT         = 14,
  43     MPLS_LABEL_MAX_RESERVED      = 15,
  44     MPLS_LABEL_INVALID           = -1
  45 };
  46
  47 /*
  48  * FF: private data passed from the MPLS dissector to subdissectors
  49  * (data parameter).
  50  */
  51 struct mplsinfo {
  52     guint32 label; /* last mpls label in label stack */
  53     guint8  exp;   /* former EXP bits of last mpls shim in stack */
  54     guint8  bos;   /* BOS bit of last mpls shim in stack */
  55     guint8  ttl;   /* TTL bits of last mpls shim in stack */
  56 };
  57
  58 extern const value_string special_labels[];
  59 extern void decode_mpls_label(tvbuff_t *tvb, int offset,
  60                               guint32 *label, guint8 *exp,
  61                               guint8 *bos, guint8 *ttl);
  62
  63 extern gboolean dissect_try_cw_first_nibble(tvbuff_t *tvb, packet_info *pinfo,
  64                                             proto_tree *tree );
  65 int dissect_mpls_echo(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_);
  66
  67 #endif