New protocol: Enterasys Interswitch Message Protocol (ismp) and

  edp (Enterasys Discovery Protocol)

svn path=/trunk/; revision=9496

1 files changed, 866 insertions, 0 deletions

diff --git a/packet-ismp.c b/packet-ismp.c
new file mode 100644
index 0000000000..daa5d3b7e2
--- /dev/null
+++ b/packet-ismp.c
@@ -0,0 +1,866 @@
+/* packet-ismp.c
+ * Routines for ISMP dissection
+ * Enterasys Networks Home: http://www.enterasys.com/
+ * Copyright 2003, Joshua Craig Douglas <jdouglas@enterasys.com>
+ *
+ * $Id: packet-ismp.c,v 1.1 2003/12/30 17:14:14 jmayer Exp $
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@ethereal.com>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <glib.h>
+
+#ifdef NEED_SNPRINTF_H
+# include "snprintf.h"
+#endif
+
+#include <epan/packet.h>
+#include <epan/strutil.h>
+#include "etypes.h"
+
+
+/* Initialize the protocol and registered fields */
+static int proto_ismp = -1;
+static int hf_ismp_version = -1;
+static int hf_ismp_message_type = -1;
+static int hf_ismp_seq_num = -1;
+static int hf_ismp_code_length = -1;
+static int hf_ismp_auth_data = -1;
+
+/* Enterasys/Cabletron Dicovery Protocol fields*/
+static int hf_ismp_edp_version = -1;
+static int hf_ismp_edp_module_ip = -1;
+static int hf_ismp_edp_module_mac = -1;
+static int hf_ismp_edp_module_port = -1;
+static int hf_ismp_edp_chassis_mac =-1;
+static int hf_ismp_edp_chassis_ip = -1;
+static int hf_ismp_edp_device_type = -1;
+static int hf_ismp_edp_module_rev = -1;
+static int hf_ismp_edp_options = -1;
+static int hf_ismp_edp_sfs_option_unused1 = -1;
+static int hf_ismp_edp_sfs_option_sfssup = -1;
+static int hf_ismp_edp_sfs_option_lsp = -1;
+static int hf_ismp_edp_sfs_option_flood = -1;
+static int hf_ismp_edp_sfs_option_resolve = -1;
+static int hf_ismp_edp_sfs_option_unused2 = -1;
+static int hf_ismp_edp_sfs_option_tagflood = -1;
+static int hf_ismp_edp_sfs_option_calltap = -1;
+static int hf_ismp_edp_sfs_option_conmsg = -1;
+static int hf_ismp_edp_sfs_option_redun = -1;
+static int hf_ismp_edp_sfs_option_isolated = -1;
+static int hf_ismp_edp_sfs_option_uplink_switch = -1;
+static int hf_ismp_edp_sfs_option_uplink_core = -1;
+static int hf_ismp_edp_sfs_option_uplink_port = -1;
+static int hf_ismp_edp_sfs_option_uplink_flood = -1;
+static int hf_ismp_edp_rtr_option_ssr = -1;
+static int hf_ismp_edp_rtr_option_igmp = -1;
+static int hf_ismp_edp_rtr_option_rip = -1;
+static int hf_ismp_edp_rtr_option_bgp = -1;
+static int hf_ismp_edp_rtr_option_ospf = -1;
+static int hf_ismp_edp_rtr_option_dvmrp = -1;
+static int hf_ismp_edp_rtr_option_8021q = -1;
+static int hf_ismp_edp_rtr_option_gvrp = -1;
+static int hf_ismp_edp_rtr_option_gmrp = -1;
+static int hf_ismp_edp_rtr_option_igmp_snoop = -1;
+static int hf_ismp_edp_rtr_option_route = -1;
+static int hf_ismp_edp_rtr_option_trans = -1;
+static int hf_ismp_edp_rtr_option_level1 = -1;
+static int hf_ismp_edp_switch_option_8021q = -1;
+static int hf_ismp_edp_switch_option_gvrp = -1;
+static int hf_ismp_edp_switch_option_gmrp = -1;
+static int hf_ismp_edp_switch_option_igmp = -1;
+static int hf_ismp_edp_switch_option_route = -1;
+static int hf_ismp_edp_switch_option_trans = -1;
+static int hf_ismp_edp_switch_option_level1 = -1;
+static int hf_ismp_edp_end_station_option_dhcp = -1;
+static int hf_ismp_edp_end_station_option_dns = -1;
+static int hf_ismp_edp_end_station_option_ad = -1;
+static int hf_ismp_edp_num_neighbors = -1;
+static int hf_ismp_edp_neighbors = -1;
+static int hf_ismp_edp_num_tuples = -1;
+static int hf_ismp_edp_tuples = -1;
+
+
+/* Initialize the subtree pointers */
+static gint ett_ismp = -1;
+static gint ett_ismp_edp = -1;
+static gint ett_ismp_edp_options = -1;
+static gint ett_ismp_edp_neighbors = -1;
+static gint ett_ismp_edp_neighbors_leaf = -1;
+static gint ett_ismp_edp_tuples = -1;
+static gint ett_ismp_edp_tuples_leaf = -1;
+
+/* ISMP TYPES */
+#define ISMPTYPE_EDP	2
+
+
+/* EDP DEVICE TYPES */
+#define EDP_DEVICE_TYPE_SFS17		1
+#define EDP_DEVICE_TYPE_SFS18		2
+#define EDP_DEVICE_TYPE_ROUTER		3
+#define EDP_DEVICE_TYPE_BRIDGE		4
+#define EDP_DEVICE_TYPE_VLANMAN		5
+#define EDP_DEVICE_TYPE_NTSERVER	6
+#define	EDP_DEVICE_TYPE_NTCLIENT	7
+#define EDP_DEVICE_TYPE_WIN95		8
+#define EDP_DEVICE_TYPE_WIN98		9
+#define EDP_DEVICE_TYPE_UNIXSERVER	10
+#define EDP_DEVICE_TYPE_UNIXCLIENT	11
+#define EDP_DEVICE_TYPE_ACCESSPOINT	12
+
+
+static const value_string edp_device_types[] = {
+        { EDP_DEVICE_TYPE_SFS17,       "Network Switch running SecureFast version 1.7 or lower" },
+        { EDP_DEVICE_TYPE_SFS18,         "Network Switch running SecureFast version 1.8 or greater" },
+        { EDP_DEVICE_TYPE_ROUTER,         "Router" },
+        { EDP_DEVICE_TYPE_BRIDGE,         "Bridge" },
+        { EDP_DEVICE_TYPE_VLANMAN,         "Cabletron VLAN Manager" },
+        { EDP_DEVICE_TYPE_NTSERVER,         "Network Server (NT)" },
+        { EDP_DEVICE_TYPE_NTCLIENT,    "Network Workstation (NT)" },
+        { EDP_DEVICE_TYPE_WIN95,     "Windows95" },
+        { EDP_DEVICE_TYPE_WIN98,        "Windows98" },
+        { EDP_DEVICE_TYPE_UNIXSERVER,       "UNIX Server" },
+        { EDP_DEVICE_TYPE_UNIXCLIENT, "UNIX Workstation" },
+        { EDP_DEVICE_TYPE_ACCESSPOINT,     "Roamabout wireless access point" },
+        { 0,                    NULL },
+};
+
+
+/* EDP SFS Options */
+#define EDP_SFS_OPTION_UNUSED1		0x1
+#define EDP_SFS_OPTION_SFSSUP		0x2
+#define EDP_SFS_OPTION_LSP		0x4
+#define EDP_SFS_OPTION_FLOOD		0x8
+#define EDP_SFS_OPTION_RESOLVE		0x10
+#define EDP_SFS_OPTION_UNUSED2		0x20
+#define EDP_SFS_OPTION_TAGFLOOD		0x40
+#define EDP_SFS_OPTION_CALLTAP		0x80
+#define EDP_SFS_OPTION_CONMSG		0x100
+#define EDP_SFS_OPTION_REDUN		0x200
+#define EDP_SFS_OPTION_ISOLATED		0x400
+#define EDP_SFS_OPTION_UPLINK_SWITCH	0x800
+#define EDP_SFS_OPTION_UPLINK_CORE	0x1000
+#define EDP_SFS_OPTION_UPLINK_PORT	0x2000
+#define EDP_SFS_OPTION_UPLINK_FLOOD	0x4000
+
+/* EDP Router Options */
+#define EDP_RTR_OPTION_SSR		0x1
+#define EDP_RTR_OPTION_IGMP		0x2
+#define EDP_RTR_OPTION_RIP		0x4
+#define EDP_RTR_OPTION_BGP		0x8
+#define EDP_RTR_OPTION_OSPF		0x10
+#define EDP_RTR_OPTION_DVMRP		0x20
+#define EDP_RTR_OPTION_8021Q		0x40
+#define EDP_RTR_OPTION_GVRP		0x80
+#define EDP_RTR_OPTION_GMRP		0x100
+#define EDP_RTR_OPTION_IGMP_SNOOP	0x200
+#define EDP_RTR_OPTION_ROUTE		0x400
+#define EDP_RTR_OPTION_TRANS		0x800
+#define EDP_RTR_OPTION_LEVEL1		0x1000
+
+/* EDP Switch Options */
+#define EDP_SWITCH_OPTION_8021Q		0x1
+#define EDP_SWITCH_OPTION_GVRP		0x2
+#define EDP_SWITCH_OPTION_GMRP		0x4
+#define EDP_SWITCH_OPTION_IGMP		0x8
+#define EDP_SWITCH_OPTION_ROUTE		0x10
+#define EDP_SWITCH_OPTION_TRANS		0x20
+#define EDP_SWITCH_OPTION_LEVEL1	0x40
+
+/* EDP End Station and Server Options */
+#define EDP_END_STATION_OPTION_DHCP	0x1
+#define EDP_END_STATION_OPTION_DNS	0x2
+#define EDP_END_STATION_OPTION_AD	0x4
+
+/* EDP Tuple Types */
+#define EDP_TUPLE_UNKNOWN		0
+#define EDP_TUPLE_HOLD			1
+#define EDP_TUPLE_INT_NAME		2
+#define EDP_TUPLE_SYS_DESCRIPT	3
+#define EDP_TUPLE_IPX_ADDR		4
+
+static const value_string edp_tuple_types[] =
+{
+	{ EDP_TUPLE_UNKNOWN,"Unknown" },
+	{ EDP_TUPLE_HOLD,"Hold Time" },
+	{ EDP_TUPLE_INT_NAME,"Interface Name" },
+	{ EDP_TUPLE_SYS_DESCRIPT,"System Description" },
+	{ EDP_TUPLE_IPX_ADDR,"IPX Address" },
+	{ 0,NULL }
+};
+
+/* Is value set? */
+static const true_false_string is_set = {
+        "set",
+        "not set"
+};
+
+
+/* Function to dissect EDP portion of ISMP message */
+static void
+dissect_ismp_edp(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *ismp_tree)
+{
+	/* local variables used for EDP dissection */ 
+	int neighbors_count = 0;
+	int tuples_count = 0;
+	guint16 device_type = 0; 
+	guint32	options = 0;
+	guint16 num_neighbors = 0;
+	guint16 num_tuples = 0;
+	guint16 tuple_type = 0;
+	guint16 tuple_length = 0;
+	const guint8 *firmware_rev;
+	const guint8 *neighbors_ptr;
+	const guint8 *tuples_ptr;
+
+	/* Set up structures needed to add the protocol subtree and manage it */
+	proto_item *edp_ti;
+	proto_tree *ismp_edp_tree;
+	
+	proto_item *edp_options_ti;
+	proto_tree *edp_options_tree;
+
+	proto_item *edp_neighbors_ti;
+	proto_tree *edp_neighbors_tree;
+
+	proto_item *edp_neighbors_leaf_ti;
+	proto_tree *edp_neighbors_leaf_tree;
+
+	proto_item *edp_tuples_ti;
+	proto_tree *edp_tuples_tree;
+
+	proto_item *edp_tuples_leaf_ti;
+	proto_tree *edp_tuples_leaf_tree;
+
+	/* add column iformation marking this as EDP (Enterasys Discover Protocol */
+	if (check_col(pinfo->cinfo, COL_PROTOCOL))
+		col_set_str(pinfo->cinfo, COL_PROTOCOL, "EDP Message");
+	if (check_col(pinfo->cinfo, COL_INFO)) 
+		col_clear(pinfo->cinfo, COL_INFO);
+
+	/* create display subtree for EDP */
+	if (ismp_tree) {
+		edp_ti  = proto_tree_add_text(ismp_tree, tvb, offset, 0, "Enterasys Discovery Protocol");
+		ismp_edp_tree = proto_item_add_subtree(edp_ti, ett_ismp_edp);
+
+		
+		proto_tree_add_item(ismp_edp_tree, hf_ismp_edp_version, tvb, offset, 2, FALSE);
+		offset += 2;
+		proto_tree_add_item(ismp_edp_tree, hf_ismp_edp_module_ip, tvb, offset, 4, FALSE);
+		offset += 4;
+		proto_tree_add_item(ismp_edp_tree, hf_ismp_edp_module_mac, tvb, offset, 6, FALSE);
+		offset += 6;
+		proto_tree_add_item(ismp_edp_tree, hf_ismp_edp_module_port, tvb, offset, 4, FALSE);
+		offset += 4;
+		proto_tree_add_item(ismp_edp_tree, hf_ismp_edp_chassis_mac, tvb, offset, 6, FALSE);
+		offset += 6;
+		proto_tree_add_item(ismp_edp_tree, hf_ismp_edp_chassis_ip, tvb, offset, 4, FALSE);
+		offset += 4;
+		device_type = tvb_get_ntohs(tvb, offset);
+		proto_tree_add_item(ismp_edp_tree, hf_ismp_edp_device_type, tvb, offset, 2, FALSE);
+		offset += 2;
+		proto_tree_add_uint_format(ismp_edp_tree, hf_ismp_edp_module_rev, tvb, offset, 4, tvb_get_ntohl(tvb, offset),
+			"Module Firmware Revision: %02x.%02x.%02x.%02x", tvb_get_guint8(tvb, offset),
+			tvb_get_guint8(tvb, offset+1), tvb_get_guint8(tvb, offset+2), tvb_get_guint8(tvb, offset+3));
+		offset += 4;
+
+		/* create display subtree for EDP options */
+		options = tvb_get_ntohl(tvb, offset);
+		edp_options_ti = proto_tree_add_uint_format(ismp_edp_tree, hf_ismp_edp_options, tvb, offset, 4,
+			options,"Options: 0x%08x",options);
+		edp_options_tree = proto_item_add_subtree(edp_options_ti, ett_ismp_edp_options);
+
+		/* depending on device_type, show the appropriate options */
+		switch (device_type) {
+			case EDP_DEVICE_TYPE_SFS17:
+			case EDP_DEVICE_TYPE_SFS18:
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_uplink_flood, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_uplink_port, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_uplink_core, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_uplink_switch, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_isolated, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_redun, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_conmsg, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_calltap, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_tagflood, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_unused2, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_resolve, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_flood, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_lsp, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_sfssup, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_unused1, tvb, offset, 4, FALSE);
+				break;
+			case EDP_DEVICE_TYPE_ROUTER:
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_level1, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_trans, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_route, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_igmp_snoop, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_gmrp, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_gvrp, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_8021q, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_dvmrp, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_ospf, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_bgp, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_rip, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_igmp, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_ssr, tvb, offset, 4, FALSE);
+				break;
+			case EDP_DEVICE_TYPE_BRIDGE:
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_switch_option_level1, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_switch_option_trans, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_switch_option_route, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_switch_option_igmp, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_switch_option_gmrp, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_switch_option_gvrp, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_switch_option_8021q, tvb, offset, 4, FALSE);
+				break;
+			case EDP_DEVICE_TYPE_VLANMAN:
+				break;
+			case EDP_DEVICE_TYPE_NTSERVER:
+			case EDP_DEVICE_TYPE_NTCLIENT:
+			case EDP_DEVICE_TYPE_WIN95:
+			case EDP_DEVICE_TYPE_WIN98:
+			case EDP_DEVICE_TYPE_UNIXSERVER:
+			case EDP_DEVICE_TYPE_UNIXCLIENT:
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_end_station_option_ad, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_end_station_option_dns, tvb, offset, 4, FALSE);
+				proto_tree_add_item(edp_options_tree, hf_ismp_edp_end_station_option_dhcp, tvb, offset, 4, FALSE);
+				break;
+			case EDP_DEVICE_TYPE_ACCESSPOINT:
+			default:
+				break;
+		}
+		offset += 4;
+		
+		/* determine the number of neighbors and create EDP neighbors subtree */
+		num_neighbors = tvb_get_ntohs(tvb, offset);
+		proto_tree_add_item(ismp_edp_tree, hf_ismp_edp_num_neighbors, tvb, offset, 2, FALSE);
+		offset += 2;
+		if (num_neighbors > 0)
+		{
+			if (tvb_reported_length_remaining(tvb, offset) >= (num_neighbors *10))
+			{
+				neighbors_ptr = tvb_get_ptr( tvb, offset, (num_neighbors*10) );
+				edp_neighbors_ti = proto_tree_add_bytes_format(ismp_edp_tree, hf_ismp_edp_neighbors, tvb, 
+					offset, num_neighbors*10, neighbors_ptr, "Neighbors:");
+			}
+			else
+			{
+				neighbors_ptr = tvb_get_ptr( tvb, offset, tvb_reported_length_remaining(tvb, offset) );
+				edp_neighbors_ti = proto_tree_add_bytes_format(ismp_edp_tree, hf_ismp_edp_neighbors, tvb, 
+					offset, num_neighbors *10, neighbors_ptr, "Neighbors:");
+			}
+			edp_neighbors_tree = proto_item_add_subtree(edp_neighbors_ti, ett_ismp_edp_neighbors);
+			while ( neighbors_count < num_neighbors && tvb_reported_length_remaining(tvb, offset) >= 10)
+			{
+				edp_neighbors_leaf_ti = proto_tree_add_text(edp_neighbors_tree, tvb, offset, 10,
+                        		        "Neighbor%d", (neighbors_count+1));
+				edp_neighbors_leaf_tree = proto_item_add_subtree(edp_neighbors_leaf_ti, ett_ismp_edp_neighbors_leaf);
+
+				proto_tree_add_text(edp_neighbors_leaf_tree, tvb, offset, 6,
+					"MAC Address: %s", ether_to_str(tvb_get_ptr(tvb, offset, 6)));
+				proto_tree_add_text(edp_neighbors_leaf_tree, tvb, offset, 4,
+					"Assigned Neighbor State 0x%04x",tvb_get_ntohl(tvb, offset));
+				offset += 10;
+				neighbors_count++;
+			}
+			if (neighbors_count != num_neighbors)
+			{
+				proto_tree_add_text(ismp_edp_tree, tvb, offset, tvb_reported_length_remaining(tvb, offset),
+				"MALFORMED PACKET");
+				return;
+			}
+		}
+		
+		/* determine data remains, if so, count tuples
+		   and create EDP tuples subtree */
+		if (tvb_reported_length_remaining(tvb, offset) != 0 && 
+			tvb_reported_length_remaining(tvb, offset) >= 2) 
+		{
+			num_tuples = tvb_get_ntohs(tvb, offset);
+			proto_tree_add_item(ismp_edp_tree, hf_ismp_edp_num_tuples, tvb, offset, 2, FALSE);
+			offset += 2;
+		}
+		else if (tvb_reported_length_remaining(tvb, offset) > 0) {
+			proto_tree_add_text(ismp_edp_tree, tvb, offset, 
+				tvb_reported_length_remaining(tvb, offset), "MALFORMED PACKET");
+			return;
+		}
+		else
+		{
+			return;
+		}
+
+		/* start populating tuple information */
+		if (num_tuples && tvb_reported_length_remaining(tvb, offset) >= 4)
+		{
+			tuples_ptr = tvb_get_ptr(tvb, offset, tvb_reported_length_remaining(tvb, offset));
+			edp_tuples_ti = proto_tree_add_bytes_format(ismp_edp_tree, hf_ismp_edp_tuples, tvb,
+				offset, tvb_reported_length_remaining(tvb, offset), tuples_ptr, "Tuples:");
+			edp_tuples_tree = proto_item_add_subtree(edp_tuples_ti, ett_ismp_edp_tuples);
+
+			while ( (tuples_count < num_tuples) && (tvb_reported_length_remaining(tvb, offset) >= 4) )
+			{
+
+				tuple_length = tvb_get_ntohs(tvb, offset+2);
+				edp_tuples_leaf_ti = proto_tree_add_text(edp_tuples_tree, tvb, offset, tuple_length,
+					"Tuple%d", tuples_count+1);
+
+				edp_tuples_leaf_tree = proto_item_add_subtree(edp_tuples_leaf_ti, ett_ismp_edp_tuples_leaf);
+
+				tuple_type = tvb_get_ntohs(tvb, offset);
+				proto_tree_add_text(edp_tuples_leaf_tree, tvb, offset, 2,
+					"Tuple Type: %s(%d)", val_to_str( tuple_type, edp_tuple_types, "Unknown"), tuple_type );
+				offset += 2;
+				proto_tree_add_text(edp_tuples_leaf_tree, tvb, offset, 2,
+					"Tuple Length: %d", tuple_length);
+				tuple_length -= 4;
+				offset += 2;
+				
+				if (tvb_reported_length_remaining(tvb, offset) >= tuple_length)
+				{
+					switch (tuple_type)
+					{						
+						case EDP_TUPLE_HOLD:
+							proto_tree_add_text(edp_tuples_leaf_tree, tvb, offset, tuple_length,
+								"Hold Time = %d", tvb_get_ntohs(tvb, offset));
+							break;
+						case EDP_TUPLE_INT_NAME:
+							proto_tree_add_text(edp_tuples_leaf_tree, tvb, offset, tuple_length,
+								"Interface Name = %s", tvb_format_text(tvb, offset, tuple_length));
+							break;
+						case EDP_TUPLE_SYS_DESCRIPT:
+							proto_tree_add_text(edp_tuples_leaf_tree, tvb, offset, tuple_length,
+								"System Description = %s", tvb_format_text(tvb, offset, tuple_length));
+							break;
+						case EDP_TUPLE_IPX_ADDR:
+							proto_tree_add_text(edp_tuples_leaf_tree, tvb, offset, tuple_length,
+								"Interface IPX_address = %s", 
+								ipx_addr_to_str(tvb_get_ntohl(tvb, offset), 
+								tvb_get_ptr(tvb, offset+4, tuple_length-4)));
+							break;
+						case EDP_TUPLE_UNKNOWN:
+						default:
+							proto_tree_add_text(edp_tuples_leaf_tree, tvb, offset, tuple_length,
+								"Unknown Tuple Data %s\n", tvb_format_text(tvb, offset, tuple_length));
+							break;
+					}  
+				}
+				offset += tuple_length;
+
+				tuples_count++;
+				tuple_type = 0;
+				tuple_length = 0;
+			} 
+			if (tuples_count != num_tuples)
+			{
+				proto_tree_add_text(ismp_edp_tree, tvb, offset, 
+					tvb_reported_length_remaining(tvb, offset), "MALFORMED PACKET");
+				return;
+			}
+			else
+			{
+				return;
+			}
+		}
+			
+	}
+		
+
+}
+
+
+/* Code to actually dissect the packets */
+static void
+dissect_ismp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+	int offset = 0;
+	guint16 message_type = 0;
+	guint8 code_length = 0;
+
+/* Set up structures needed to add the protocol subtree and manage it */
+	proto_item *ti;
+	proto_tree *ismp_tree;
+
+/* Make entries in Protocol column and Info column on summary display */
+	if (check_col(pinfo->cinfo, COL_PROTOCOL)) 
+		col_set_str(pinfo->cinfo, COL_PROTOCOL, "ISMP");
+	if (check_col(pinfo->cinfo, COL_INFO)) 
+		col_clear(pinfo->cinfo, COL_INFO);
+
+
+	if (tree) {
+		/* create display subtree for ismp */
+		ti = proto_tree_add_item(tree, proto_ismp, tvb, offset, -1, FALSE);
+
+		ismp_tree = proto_item_add_subtree(ti, ett_ismp);
+
+		/* add an items to the subtree */
+		proto_tree_add_item(ismp_tree, hf_ismp_version, tvb, offset, 2, FALSE);
+		offset += 2;
+		message_type = tvb_get_ntohs(tvb, offset);
+		proto_tree_add_item(ismp_tree, hf_ismp_message_type, tvb, offset, 2, FALSE);
+		offset += 2;
+		proto_tree_add_item(ismp_tree, hf_ismp_seq_num, tvb, offset, 2, FALSE);
+		offset += 2;
+		code_length = tvb_get_guint8(tvb, offset);
+		proto_tree_add_item(ismp_tree, hf_ismp_code_length, tvb, offset, 1, FALSE);
+		offset += 1;
+		proto_tree_add_item(ismp_tree, hf_ismp_auth_data, tvb, offset, code_length, FALSE);
+		offset += code_length;
+		
+		/* if Enterasys Discover Protocol, dissect it */
+		if(message_type == ISMPTYPE_EDP)
+			dissect_ismp_edp(tvb, pinfo, offset, ismp_tree);
+	}
+
+}
+
+
+/* Register this protocol with Ethereal */
+void
+proto_register_ismp(void)
+{                 
+
+/* Setup list of header fields  See Section 1.6.1 for details*/
+	static hf_register_info hf[] = {
+		{ &hf_ismp_version,
+			{ "Version",           "ismp.version",
+			FT_UINT16, BASE_DEC, NULL, 0x0,          
+			"", HFILL }
+		},
+		{ &hf_ismp_message_type,
+			{ "Message Type", "ismp.msgtype",
+			FT_UINT16, BASE_DEC, NULL, 0x0,
+			"", HFILL }
+		},
+		{ &hf_ismp_seq_num,
+			{ "Sequence Number", "ismp.seqnum",
+			FT_UINT16, BASE_DEC, NULL, 0x0,
+			"", HFILL }
+		},
+		{ &hf_ismp_code_length,
+			{ "Auth Code Length", "ismp.codelen",
+			FT_UINT8, BASE_DEC, NULL, 0x0,
+			"", HFILL }
+		}, 
+		{ &hf_ismp_auth_data,
+			{ "Auth Data", "ismp.authdata",
+			FT_BYTES, BASE_HEX, NULL, 0x0,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_version,
+			{ "Version", "ismp.edp.version",
+			FT_UINT16, BASE_DEC, NULL, 0x0,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_module_ip,
+			{ "Module IP Address", "ismp.edp.modip",
+			FT_IPv4, BASE_NONE, NULL, 0x0,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_module_mac,
+			{ "Module MAC Address", "ismp.edp.modmac",
+			FT_ETHER, BASE_NONE, NULL, 0x0,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_module_port,
+			{ "Module Port (ifIndex num)", "ismp.edp.modport",
+			FT_UINT32, BASE_DEC, NULL, 0x0,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_chassis_mac,
+			{ "Chassis MAC Address", "ismp.edp.chassismac",
+			FT_ETHER, BASE_NONE, NULL, 0x0,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_chassis_ip,
+			{ "Chassis IP Address", "ismp.edp.chassisip",
+			FT_IPv4, BASE_NONE, NULL, 0x0,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_device_type,
+			{ "Device Type", "ismp.edp.devtype",
+			FT_UINT16, BASE_DEC, edp_device_types, 0x0,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_module_rev,
+			{ "Module Firmware Revision", "ismp.edp.rev",
+			FT_UINT32, BASE_DEC, NULL, 0x0,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_options,
+			{ "Device Options", "ismp.edp.opts",
+			FT_UINT32, BASE_DEC, NULL, 0x0,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_sfs_option_unused1,
+			{ "Unused", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_UNUSED1,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_sfs_option_sfssup,
+			{ "SFS Support", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_SFSSUP,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_sfs_option_lsp,
+			{ "LSP Support", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_LSP,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_sfs_option_flood,
+			{ "Flood Path Support", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_FLOOD,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_sfs_option_resolve,
+			{ "Resolve Support", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_RESOLVE,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_sfs_option_unused2,
+			{ "Unused", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_UNUSED2,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_sfs_option_tagflood,
+			{ "Tagged Flood Support", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_TAGFLOOD,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_sfs_option_calltap,
+			{ "Call Tap Support", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_CALLTAP,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_sfs_option_conmsg,
+			{ "Connection Message Support", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_CONMSG,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_sfs_option_redun,
+			{ "Redundant Access Support", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_REDUN,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_sfs_option_isolated,
+			{ "Isolated Switch", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_ISOLATED,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_sfs_option_uplink_switch,
+			{ "Uplink Switch", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_UPLINK_SWITCH,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_sfs_option_uplink_core,
+			{ "Uplink Core", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_UPLINK_CORE,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_sfs_option_uplink_port,
+			{ "Uplink Port", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_UPLINK_PORT,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_sfs_option_uplink_flood,
+			{ "Uplink Flood Support", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_UPLINK_FLOOD,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_rtr_option_ssr,
+			{ "SSR Type Device", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_SSR,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_rtr_option_igmp,
+			{ "IGMP Active", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_IGMP,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_rtr_option_rip,
+			{ "RIP Active", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_RIP,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_rtr_option_bgp,
+			{ "BGP Active", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_BGP,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_rtr_option_ospf,
+			{ "OSPF Active", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_OSPF,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_rtr_option_dvmrp,
+			{ "DVMRP Active", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_DVMRP,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_rtr_option_8021q,
+			{ "802.1Q Support", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_8021Q,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_rtr_option_gvrp,
+			{ "GVRP Support", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_GVRP,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_rtr_option_gmrp,
+			{ "GMRP Support", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_GMRP,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_rtr_option_igmp_snoop,
+			{ "IGMP Snooping Support", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_IGMP_SNOOP,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_rtr_option_route,
+			{ "Route Bridging", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_ROUTE,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_rtr_option_trans,
+			{ "Transparent Bridging", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_TRANS,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_rtr_option_level1,
+			{ "Level 1 Functionality", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_LEVEL1,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_switch_option_8021q,
+			{ "802.1Q Support", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SWITCH_OPTION_8021Q,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_switch_option_gvrp,
+			{ "GVRP Support", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SWITCH_OPTION_GVRP,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_switch_option_gmrp,
+			{ "GMRP Support", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SWITCH_OPTION_GMRP,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_switch_option_igmp,
+			{ "IGMP Snooping Support", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SWITCH_OPTION_IGMP,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_switch_option_route,
+			{ "Route Bridging", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SWITCH_OPTION_ROUTE,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_switch_option_trans,
+			{ "Transparent Bridging", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SWITCH_OPTION_TRANS,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_switch_option_level1,
+			{ "Level 1 Functionality", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_SWITCH_OPTION_LEVEL1,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_end_station_option_dhcp,
+			{ "DHCP Enabled", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_END_STATION_OPTION_DHCP,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_end_station_option_dns,
+			{ "DNS Enabled", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_END_STATION_OPTION_DNS,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_end_station_option_ad,
+			{ "Active Directory Enabled", "ismp.edp.opts",
+			FT_BOOLEAN, 32, TFS(&is_set), EDP_END_STATION_OPTION_AD,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_num_neighbors,
+			{ "Number of Known Neighbors", "ismp.edp.maccount",
+			FT_UINT16, BASE_DEC, NULL, 0x0,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_neighbors,
+			{ "Neighbors", "ismp.edp.nbrs",
+			FT_BYTES, BASE_NONE, NULL, 0x0,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_num_tuples,
+			{ "Number of Tuples", "ismp.edp.numtups",
+			FT_UINT16, BASE_DEC, NULL, 0x0,
+			"", HFILL }
+		},
+		{ &hf_ismp_edp_tuples,
+			{ "Number of Tuples", "ismp.edp.tups",
+			FT_BYTES, BASE_NONE, NULL, 0x0,
+			"", HFILL }
+		},
+	};
+
+/* Setup protocol subtree array */
+	static gint *ett[] = {
+		&ett_ismp,
+		&ett_ismp_edp,
+		&ett_ismp_edp_options,
+		&ett_ismp_edp_neighbors,
+		&ett_ismp_edp_neighbors_leaf,
+		&ett_ismp_edp_tuples,
+		&ett_ismp_edp_tuples_leaf,
+	};
+
+/* Register the protocol name and description */
+	proto_ismp = proto_register_protocol("InterSwitch Message Protocol",
+	    "ISMP", "ismp");
+
+/* Required function calls to register the header fields and subtrees used */
+	proto_register_field_array(proto_ismp, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+}
+
+
+/* If this dissector uses sub-dissector registration add a registration routine.
+   This format is required because a script is used to find these routines and
+   create the code that calls these routines.
+*/
+void
+proto_reg_handoff_ismp(void)
+{
+	dissector_handle_t ismp_handle;
+
+	ismp_handle = create_dissector_handle(dissect_ismp,
+	    proto_ismp);
+	dissector_add("ethertype", ETHERTYPE_ISMP, ismp_handle);
+}