380 lines
13 KiB
C
380 lines
13 KiB
C
/* packet-prp.c
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* Routines for PRP (Parallel Redundancy Protocol; IEC62439 Chapter 6) dissection
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* Copyright 2007, Sven Meier <msv[AT]zhwin.ch>
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*
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* $Id$
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*
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* Revisions:
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* -
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*
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* A plugin for:
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald[AT]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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/etypes.h>
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#include <epan/prefs.h>
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/**********************************************************/
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/* Offsets of fields within a PRP packet. */
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/**********************************************************/
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#define PRP_VERSION_OFFSET 0
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#define PRP_TYPE_OFFSET 2
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#define PRP_LENGTH_OFFSET 3
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#define PRP_SOURCEMACADDRESSA_OFFSET 4
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#define PRP_SOURCEMACADDRESSB_OFFSET 10
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#define PRP_TYPE2_OFFSET 16
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#define PRP_LENGTH2_OFFSET 17
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#define PRP_REDBOXVDANMACADRESS_OFFSET 18
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/**********************************************************/
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/* Lengths of fields within a PRP packet. */
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/**********************************************************/
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#define PRP_VERSION_LENGTH 2
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#define PRP_TYPE_LENGTH 1
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#define PRP_LENGTH_LENGTH 1
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#define PRP_SOURCE_LENGTH 6
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#define PRP_TOTAL_LENGTH 24
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/**********************************************************/
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/* Channel values for the PRP_TYPE field */
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/**********************************************************/
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#define PRP_TYPE_DUPLICATE_ACCEPT 21
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#define PRP_TYPE_DUPLICATE_DISCARD 20
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#define PRP_TYPE_REDBOX 30
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#define PRP_TYPE_VDAN 31
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static const value_string prp_type_vals[] = {
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{PRP_TYPE_DUPLICATE_ACCEPT, "Duplicate Accept"},
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{PRP_TYPE_DUPLICATE_DISCARD, "Duplicate Discard"},
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{PRP_TYPE_REDBOX, "Redundancy Box"},
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{PRP_TYPE_VDAN, "Virtual Dual Attached Node"},
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{0, NULL } };
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#define PRP_LAN_A 10
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#define PRP_LAN_B 11
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static const value_string prp_lan_vals[] = {
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{PRP_LAN_A, "LAN A"},
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{PRP_LAN_B, "LAN B"},
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{0, NULL } };
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/**********************************************************/
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/* Initialize the protocol and registered fields */
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/**********************************************************/
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void proto_reg_handoff_prp(void);
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static int proto_prp = -1;
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static module_t *prp_module;
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/* Initialize supervision frame fields */
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static int hf_prp_supervision_frame_version = -1;
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static int hf_prp_supervision_frame_type = -1;
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static int hf_prp_supervision_frame_length = -1;
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static int hf_prp_supervision_frame_source_mac_address_A = -1;
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static int hf_prp_supervision_frame_source_mac_address_B = -1;
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static int hf_prp_supervision_frame_type2 = -1;
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static int hf_prp_supervision_frame_length2 = -1;
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static int hf_prp_supervision_frame_red_box_mac_address = -1;
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static int hf_prp_supervision_frame_vdan_mac_address = -1;
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/* Initialize trailer fields */
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static int hf_prp_redundancy_control_trailer_sequence_nr = -1;
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static int hf_prp_redundancy_control_trailer_lan = -1;
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static int hf_prp_redundancy_control_trailer_size = -1;
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/* Initialize the subtree pointers */
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static gint ett_prp_supervision_frame = -1;
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static gint ett_prp_redundancy_control_trailer = -1;
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/* Post dissectors (such as the trailer dissector for this protocol)
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* get called for every single frame anyone loads into Wireshark.
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* Since this protocol is not of general interest we disable this
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* protocol by default.
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*
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* This is done separately from the disabled protocols list mainly so
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* we can disable it by default. XXX Maybe there's a better way.
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*/
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static gboolean prp_enable_dissector = FALSE;
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/* Code to actually dissect the packets */
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static void
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dissect_prp_supervision_frame(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ti;
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proto_tree *prp_tree;
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guint16 tlv2;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "PRP");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_set_str(pinfo->cinfo, COL_INFO, "Supervision Frame");
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if (!tree)
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return;
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/* create display subtree for the protocol */
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ti = proto_tree_add_item(tree, proto_prp, tvb, 0, PRP_TOTAL_LENGTH,
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FALSE);
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prp_tree = proto_item_add_subtree(ti, ett_prp_supervision_frame);
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proto_tree_add_item(prp_tree, hf_prp_supervision_frame_version,
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tvb, PRP_VERSION_OFFSET, PRP_VERSION_LENGTH, FALSE);
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proto_tree_add_item(prp_tree, hf_prp_supervision_frame_type,
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tvb, PRP_TYPE_OFFSET, PRP_TYPE_LENGTH, FALSE);
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proto_tree_add_item(prp_tree, hf_prp_supervision_frame_length,
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tvb, PRP_LENGTH_OFFSET, PRP_LENGTH_LENGTH, FALSE);
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proto_tree_add_item(prp_tree, hf_prp_supervision_frame_source_mac_address_A,
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tvb, PRP_SOURCEMACADDRESSA_OFFSET, PRP_SOURCE_LENGTH,
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FALSE);
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proto_tree_add_item(prp_tree, hf_prp_supervision_frame_source_mac_address_B,
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tvb, PRP_SOURCEMACADDRESSB_OFFSET, PRP_SOURCE_LENGTH,
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FALSE);
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tlv2 = tvb_get_ntohs(tvb, PRP_TYPE2_OFFSET);
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if((tlv2 == 0x1e06) || (tlv2 == 0x1f06))
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{
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proto_tree_add_item(prp_tree, hf_prp_supervision_frame_type2,
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tvb, PRP_TYPE2_OFFSET, PRP_TYPE_LENGTH, FALSE);
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proto_tree_add_item(prp_tree, hf_prp_supervision_frame_length2,
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tvb, PRP_LENGTH2_OFFSET, PRP_LENGTH_LENGTH, FALSE);
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if(tlv2 == 0x1e06)
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{
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proto_tree_add_item(prp_tree, hf_prp_supervision_frame_red_box_mac_address,
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tvb, PRP_REDBOXVDANMACADRESS_OFFSET, PRP_SOURCE_LENGTH,
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FALSE);
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}
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else
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{
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proto_tree_add_item(prp_tree, hf_prp_supervision_frame_vdan_mac_address,
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tvb, PRP_REDBOXVDANMACADRESS_OFFSET, PRP_SOURCE_LENGTH,
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FALSE);
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}
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}
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}
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static void
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dissect_prp_redundancy_control_trailer(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
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{
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proto_item *ti;
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proto_tree *prp_tree;
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guint i;
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guint length;
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guint offset;
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guint16 lan_size;
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guint trailer_offset;
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if (!tree)
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return;
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trailer_offset = 0;
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length = tvb_reported_length(tvb);
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if(length < 14)
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{
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return;
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}
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if(0x8000 == tvb_get_ntohs(tvb, 12)) /* taged frame */
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{
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offset = 18;
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}
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else /* untaged */
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{
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offset = 14;
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}
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if(length <= 64)
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{
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for(i=length; i>=(offset+4); i--) /* search trailer */
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{
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lan_size = tvb_get_ntohs(tvb, (i-2));
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if((lan_size == (0xa000 | ((i-offset) & 0x0fff)))
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|| (lan_size == (0xb000 | ((i-offset) & 0x0fff))))
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{
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trailer_offset = i;
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}
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}
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}
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else if(length > 64)
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{
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lan_size = tvb_get_ntohs(tvb, (length-2));
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if((lan_size == (0xa000 | ((length-offset) & 0x0fff)))
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|| (lan_size == (0xb000 | ((length-offset) & 0x0fff))))
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{
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trailer_offset = length;
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}
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}
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if(trailer_offset != 0)
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{
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/* create display subtree for the protocol */
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ti = proto_tree_add_item(tree, proto_prp, tvb, trailer_offset - 4,
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trailer_offset, FALSE);
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prp_tree = proto_item_add_subtree(ti, ett_prp_redundancy_control_trailer);
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proto_tree_add_item(prp_tree, hf_prp_redundancy_control_trailer_sequence_nr,
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tvb, (trailer_offset-4), 2, FALSE);
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proto_tree_add_item(prp_tree, hf_prp_redundancy_control_trailer_lan,
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tvb, (trailer_offset-2), 2, FALSE);
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proto_tree_add_item(prp_tree, hf_prp_redundancy_control_trailer_size,
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tvb, (trailer_offset-2), 2, FALSE);
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}
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}
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/* Register the protocol with Wireshark */
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void proto_register_prp(void)
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{
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static hf_register_info hf[] = {
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/*supervision frame*/
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{ &hf_prp_supervision_frame_version,
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{ "version", "prp.supervision_frame.version",
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FT_UINT16, BASE_DEC, NULL, 0x00,
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"", HFILL }
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},
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{ &hf_prp_supervision_frame_type,
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{ "type", "prp.supervision_frame.type",
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FT_UINT8, BASE_DEC, VALS(prp_type_vals), 0x00,
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"", HFILL }
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},
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{ &hf_prp_supervision_frame_length,
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{ "length", "prp.supervision_frame.length",
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FT_UINT8, BASE_DEC, NULL, 0x00,
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"", HFILL }
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},
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{ &hf_prp_supervision_frame_source_mac_address_A,
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{ "sourceMacAddressA", "prp.supervision_frame.prp_source_mac_address_A",
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FT_ETHER, BASE_DEC, NULL, 0x00,
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"", HFILL }
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},
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{ &hf_prp_supervision_frame_source_mac_address_B,
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{ "sourceMacAddressB", "prp.supervision_frame.prp_source_mac_address_B",
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FT_ETHER, BASE_DEC, NULL, 0x00,
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"", HFILL }
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},
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{ &hf_prp_supervision_frame_type2,
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{ "type2", "prp.supervision_frame.type2",
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FT_UINT8, BASE_DEC, VALS(prp_type_vals), 0x00,
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"", HFILL }
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},
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{ &hf_prp_supervision_frame_length2,
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{ "length2", "prp.supervision_frame.length2",
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FT_UINT8, BASE_DEC, NULL, 0x00,
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"", HFILL }
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},
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{ &hf_prp_supervision_frame_red_box_mac_address,
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{ "redBoxMacAddress", "prp.supervision_frame.prp_red_box_mac_address",
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FT_ETHER, BASE_DEC, NULL, 0x00,
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"", HFILL }
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},
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{ &hf_prp_supervision_frame_vdan_mac_address,
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{ "vdanMacAddress", "prp.supervision_frame.prp_vdan_mac_address",
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FT_ETHER, BASE_DEC, NULL, 0x00,
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"", HFILL }
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},
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/*trailer*/
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{ &hf_prp_redundancy_control_trailer_sequence_nr,
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{ "sequenceNr", "prp.trailer.prp_sequence_nr",
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FT_UINT16, BASE_DEC, NULL, 0x00,
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"", HFILL }
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},
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{ &hf_prp_redundancy_control_trailer_lan,
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{ "lan", "prp.trailer.prp_lan",
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FT_UINT16, BASE_DEC, VALS(prp_lan_vals), 0xf000,
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"", HFILL }
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},
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{ &hf_prp_redundancy_control_trailer_size,
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{ "size", "prp.trailer.prp_size",
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FT_UINT16, BASE_DEC, NULL, 0x0fff,
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"", HFILL }
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}
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};
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static gint *ett[] = {
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&ett_prp_supervision_frame,
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&ett_prp_redundancy_control_trailer,
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};
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/* Register the protocol name and description */
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proto_prp = proto_register_protocol("Parallel Redundancy Protocol (IEC62439 Chapter 6)",
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"PRP", "prp");
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prp_module = prefs_register_protocol(proto_prp, proto_reg_handoff_prp);
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prefs_register_bool_preference(prp_module, "enable", "Enable dissector",
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"Enable this dissector (default is false)",
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&prp_enable_dissector);
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/* Required function calls to register the header fields and subtree used */
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proto_register_field_array(proto_prp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void proto_reg_handoff_prp(void)
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{
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static gboolean prefs_initialized = FALSE;
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if (!prefs_initialized) {
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dissector_handle_t prp_supervision_frame_handle;
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dissector_handle_t prp_redundancy_control_trailer_handle;
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prp_supervision_frame_handle = create_dissector_handle(dissect_prp_supervision_frame, proto_prp);
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dissector_add("ethertype", ETHERTYPE_PRP, prp_supervision_frame_handle);
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prp_redundancy_control_trailer_handle = create_dissector_handle(dissect_prp_redundancy_control_trailer, proto_prp);
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register_postdissector(prp_redundancy_control_trailer_handle);
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prefs_initialized = TRUE;
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}
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proto_set_decoding(proto_prp, prp_enable_dissector);
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}
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