2012-12-01 15:39:14 +00:00
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/* packet-pw-oam.c
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*
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* Routines for Pseudowire Status for static pseudowires : RFC 6478
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*
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* (c) Copyright 2012, Krishnamurthy Mayya <krishnamurthymayya@gmail.com>
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2013-04-04 15:33:14 +00:00
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* Nikitha Malgi <nikitha01@gmail.com>
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2012-12-01 15:39:14 +00:00
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*
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2012-12-01 17:44:51 +00:00
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* $Id$
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*
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2012-12-01 15:39:14 +00:00
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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2013-12-12 19:52:14 +00:00
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void proto_register_pw_oam(void);
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void proto_reg_handoff_pw_oam(void);
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2012-12-01 15:39:14 +00:00
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/* MPLS-TP FM protocol specific variables */
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static gint proto_pw_oam = -1;
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static gint ett_pw_oam = -1;
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static gint ett_pw_oam_flags = -1;
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static gint ett_pw_oam_tlv_tree = -1;
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static int hf_pw_oam_tlv_reserved = -1;
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static int hf_pw_oam_tlv_type = -1;
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static int hf_pw_oam_total_tlv_len = -1;
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static int hf_pw_oam_code = -1;
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static int hf_pw_oam_flags = -1;
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static int hf_pw_oam_flags_a = -1;
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static int hf_pw_oam_refresh_timer = -1;
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static int hf_pw_oam_tlv_len = -1;
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static const value_string pw_oam_code[] = {
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{0x00000002, "Local Attachment Circuit(ingress) Receive Fault"},
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{0x00000004, "Local Attachment Circuit(egress) Transmit Fault"},
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{0x00000020, "PW Forwarding Standby"},
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{0x00000040, "Request Switchover to this PW"},
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{0, NULL}
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};
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/* PW-Status TLV dissector */
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2013-12-17 22:07:32 +00:00
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static void
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2012-12-01 15:39:14 +00:00
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dissect_pw_status_tlv (tvbuff_t *tvb, proto_tree *tree, gint offset)
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{
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2012-12-01 17:44:51 +00:00
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proto_item *ti;
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proto_tree *pw_oam_tlv_tree;
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2012-12-01 15:39:14 +00:00
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2013-04-04 15:33:14 +00:00
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ti = proto_tree_add_protocol_format (tree, proto_pw_oam, tvb, offset, 8,
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2012-12-01 15:39:14 +00:00
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"Pseudo-Wire Status TLV");
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if (!tree)
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return;
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pw_oam_tlv_tree = proto_item_add_subtree (ti, ett_pw_oam_tlv_tree);
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2012-12-11 23:23:35 +00:00
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proto_tree_add_item (pw_oam_tlv_tree, hf_pw_oam_tlv_reserved, tvb, offset,
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2, ENC_BIG_ENDIAN);
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2012-12-01 15:39:14 +00:00
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proto_tree_add_item (pw_oam_tlv_tree, hf_pw_oam_tlv_type, tvb, offset,
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2, ENC_BIG_ENDIAN);
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offset = offset + 2;
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proto_tree_add_item (pw_oam_tlv_tree, hf_pw_oam_tlv_len, tvb, offset,
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2, ENC_BIG_ENDIAN);
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offset = offset + 2;
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proto_tree_add_item (pw_oam_tlv_tree, hf_pw_oam_code, tvb, offset,
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4, ENC_BIG_ENDIAN);
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2013-01-06 14:50:44 +00:00
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/*offset = offset + 4;*/
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2012-12-01 15:39:14 +00:00
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return ;
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}
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/* Dissector for PW OAM protocol: RFC 6478 */
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static void
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dissect_pw_oam(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ti = NULL, *ti_flags = NULL;
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proto_tree *pw_oam_tree = NULL, *pw_oam_flags = NULL;
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guint8 offset = 0;
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guint16 pw_tlv_type = 0;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "PW OAM");
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col_clear(pinfo->cinfo, COL_INFO);
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if (!tree)
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return;
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ti = proto_tree_add_item(tree, proto_pw_oam, tvb, 0, -1, ENC_NA);
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pw_oam_tree = proto_item_add_subtree (ti, ett_pw_oam);
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/* Refresh-Timer field */
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proto_tree_add_item (pw_oam_tree, hf_pw_oam_refresh_timer, tvb, offset,
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2, ENC_BIG_ENDIAN);
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offset = offset + 2;
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/* Total-TLV length */
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proto_tree_add_item (pw_oam_tree, hf_pw_oam_total_tlv_len, tvb, offset,
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1, ENC_BIG_ENDIAN);
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offset = offset + 1;
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/* Flags field */
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2013-04-04 15:33:14 +00:00
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ti_flags = proto_tree_add_item (pw_oam_tree, hf_pw_oam_flags, tvb,
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2012-12-01 15:39:14 +00:00
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offset, 1, ENC_BIG_ENDIAN);
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pw_oam_flags = proto_item_add_subtree(ti_flags, ett_pw_oam_flags);
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2013-04-04 15:33:14 +00:00
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proto_tree_add_item (pw_oam_flags, hf_pw_oam_flags_a, tvb, offset, 1, ENC_BIG_ENDIAN);
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2012-12-01 15:39:14 +00:00
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offset = offset + 1;
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pw_tlv_type = tvb_get_ntohs (tvb, offset);
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/* TLVs */
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switch (pw_tlv_type)
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{
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/* The switch cases below have to be based on the LDP-name space.
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http://www.iana.org/assignments/ldp-namespaces/ldp-namespaces.xml */
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case 0x096A: /* PW-Status TLV */
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dissect_pw_status_tlv (tvb, tree, offset);
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break;
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default:
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break;
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}
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return;
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}
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void
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proto_register_pw_oam(void)
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{
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static hf_register_info hf[] = {
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{&hf_pw_oam_refresh_timer,
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{"Refresh-Timer", "pw_oam.refresh-timer", FT_UINT16,
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BASE_HEX, NULL, 0x0, NULL, HFILL }},
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{&hf_pw_oam_total_tlv_len,
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{"TLV Length", "pw_oam.total-tlv-len", FT_UINT8,
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BASE_HEX, NULL, 0x0, NULL, HFILL }},
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{&hf_pw_oam_flags,
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{"Flags", "pw_oam.flags", FT_UINT8,
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2012-12-01 17:44:51 +00:00
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BASE_HEX, NULL, 0x0000, "OAM Flags", HFILL }},
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2012-12-01 15:39:14 +00:00
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{&hf_pw_oam_flags_a,
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{"Acknowledgement", "pw_oam.flags_a",
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FT_BOOLEAN, 8, NULL, 0x0080, "ACK bit", HFILL}
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},
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{&hf_pw_oam_tlv_reserved,
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{"Reserved", "pw_oam.tlv-reserved",
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2012-12-11 23:23:35 +00:00
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FT_UINT16, BASE_HEX, NULL, 0xC000, NULL, HFILL}
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2012-12-01 15:39:14 +00:00
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},
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{&hf_pw_oam_tlv_type,
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{"TLV Type", "pw_oam.tlv-type",
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2012-12-11 23:23:35 +00:00
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FT_UINT16, BASE_HEX, NULL, 0x3FFF, NULL, HFILL}
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2012-12-01 15:39:14 +00:00
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},
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{&hf_pw_oam_tlv_len,
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2012-12-01 17:44:51 +00:00
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{"TLV Length", "pw_oam.tlv-len",
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2012-12-01 15:39:14 +00:00
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FT_UINT16, BASE_HEX, NULL, 0x00, NULL, HFILL}
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},
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{&hf_pw_oam_code,
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{"Status code", "pw_oam.code", FT_UINT16,
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BASE_HEX, VALS(pw_oam_code), 0x0, "PW Status Code", HFILL }
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},
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};
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static gint *ett[] = {
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&ett_pw_oam,
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&ett_pw_oam_tlv_tree,
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&ett_pw_oam_flags,
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};
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proto_pw_oam =
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proto_register_protocol("Pseudo-Wire OAM", "PW-OAM "
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"Pseudo-Wire OAM Protocol",
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"pw_oam");
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proto_register_field_array (proto_pw_oam, hf, array_length(hf));
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proto_register_subtree_array (ett, array_length(ett));
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register_dissector("pw_oam", dissect_pw_oam, proto_pw_oam);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 2
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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