/* packet-ans.c
 * Routines for Intel ANS probe dissection
 *
 * $Id: packet-ans.c 14884 2005-07-09 00:53:17Z guy $
 *
 * Ethereal - Network traffic analyzer
 * By Gerald Combs <gerald@ethereal.com>
 * Copyright 2003 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.
 *
 * The following information was graciously provided by Intel:
 * Offset    Size (bytes)    Contents	
 * 0         6               Destination Broadcast probes: {FF,FF,FF,FF,FF,FF} 
 *                           Multicast probes: {01,AA,00,00,00,00}	
 * 6         6               Source Matches the CurrentMACAddress of the 
 *                           adapter sending the probe.	
 * 8         2               Type Network order is 0x886D, Intel's reserved 
 *                           packet type.
 * 10 (0)    2               ApplicationID Network order is 0x0001, identifies 
 *                           it as fault tolerance probe.	
 * 12 (2)    2               RevID Network order, identifies the revision id 
 *                           of Teaming software.	
 * 16 (4)    4               ProbeSequenceNumber Ascending sequence number 
 *                           that identifies the current probing cycle.	
 * 20 (8)    2               SenderID Unique ID within a team identifying 
 *                           the member that originally sent the probe.	
 * 22 (10)   6               TeamID Unique ID identifying the team in charge 
 *                           of this probe.	
 * 28        Padding         Reserved	
 *
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <glib.h>

#include <epan/packet.h>
#include <epan/proto.h>
#include <etypes.h>

/* Initialize the protocol and registered fields */
static int proto_ans        = -1;

static int hf_ans_app_id    = -1;
static int hf_ans_rev_id    = -1;
static int hf_ans_seq_num   = -1;
static int hf_ans_sender_id = -1;
static int hf_ans_team_id   = -1;

/* Initialize the subtree pointers */
static gint ett_ans = -1;

/* Code to actually dissect the packets */
static void
dissect_ans(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
	proto_item  *ti;
	proto_tree  *ans_tree = NULL;
	guint16      sender_id;
	guint32      seq_num;
	guint8       team_id[6];

	if (check_col(pinfo->cinfo, COL_PROTOCOL))
		col_set_str(pinfo->cinfo, COL_PROTOCOL, "Intel ANS probe");

	if (check_col(pinfo->cinfo, COL_INFO)) {
		col_clear(pinfo->cinfo, COL_INFO);
		
		seq_num = tvb_get_ntohl(tvb, 4);
		sender_id = tvb_get_ntohs(tvb, 8);
		tvb_memcpy(tvb, team_id, 10, 6);

		col_append_fstr(pinfo->cinfo, COL_INFO, "Sequence: %u, Sender ID %u, Team ID %s",
			seq_num, sender_id, ether_to_str(team_id));
	}

	if (tree) {
		ti = proto_tree_add_item(tree, proto_ans, tvb, 0, -1, FALSE);
		ans_tree = proto_item_add_subtree(ti, ett_ans);

		proto_tree_add_item(ans_tree, hf_ans_app_id, tvb, 0, 2, FALSE);
		proto_tree_add_item(ans_tree, hf_ans_rev_id, tvb, 2, 2, FALSE);
		proto_tree_add_item(ans_tree, hf_ans_seq_num, tvb, 4, 4, FALSE);
		proto_tree_add_item(ans_tree, hf_ans_sender_id, tvb, 8, 2, FALSE);
		proto_tree_add_item(ans_tree, hf_ans_team_id, tvb, 10, 6, FALSE);
	}
}


void
proto_register_ans(void)
{
	static hf_register_info hf[] = {
		{ &hf_ans_app_id,
			{ "Application ID", "ans.app_id",
				FT_UINT16, BASE_HEX, NULL, 0,
				"Intel ANS Application ID", HFILL }
		},
		{ &hf_ans_rev_id,
			{ "Revision ID", "ans.rev_id",
				FT_UINT16, BASE_HEX, NULL, 0,
				"Intel ANS Revision ID", HFILL }
		},
		{ &hf_ans_seq_num,
			{ "Sequence Number", "ans.seq_num",
				FT_UINT32, BASE_DEC, NULL, 0,
				"Intel ANS Sequence Number", HFILL }
		},
		{ &hf_ans_sender_id,
			{ "Sender ID", "ans.sender_id",
				FT_UINT16, BASE_DEC, NULL, 0,
				"Intel ANS Sender ID", HFILL }
		},
		{ &hf_ans_team_id,
			{ "Team ID", "ans.team_id",
				FT_ETHER, BASE_HEX, NULL, 0,
				"Intel ANS Team ID", HFILL }
		},
	};

	static gint *ett[] = {
		&ett_ans,
	};

	proto_ans = proto_register_protocol("Intel ANS probe", "ANS", "ans");
	proto_register_field_array(proto_ans, hf, array_length(hf));
	proto_register_subtree_array(ett, array_length(ett));
}


void
proto_reg_handoff_ans(void)
{
	dissector_handle_t ans_handle;

	ans_handle = create_dissector_handle(dissect_ans, proto_ans);
	dissector_add("ethertype", ETHERTYPE_INTEL_ANS, ans_handle);
}
