/* packet-hpext.c
 * Routines for HP extended IEEE 802.2 LLC layer
 * Jochen Friedrich <jochen@scram.de>
 *
 * $Id: packet-hpext.c 12127 2004-09-28 23:48:02Z guy $
 *
 * 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 <glib.h>
#include <epan/packet.h>
#include <epan/xdlc.h>
#include "etypes.h"
#include "llcsaps.h"
#include "packet-hpext.h"

static dissector_table_t subdissector_table;

static dissector_handle_t data_handle;

static int proto_hpext = -1;

static int hf_hpext_dxsap = -1;
static int hf_hpext_sxsap = -1;

static gint ett_hpext = -1;

const value_string xsap_vals[] = {
	{ HPEXT_DXSAP,  "RBOOT Destination Service Access Point" },
	{ HPEXT_SXSAP,  "RBOOT Source Service Access Point" },
	{ HPEXT_SNMP,   "SNMP" },
	{ 0x00,         NULL }
};

static void
dissect_hpext(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
	proto_tree	*hpext_tree = NULL;
	proto_item	*ti = NULL;
	guint16		dxsap, sxsap;
	tvbuff_t	*next_tvb;

	if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
		col_set_str(pinfo->cinfo, COL_PROTOCOL, "HPEXT");
	}

	dxsap = tvb_get_ntohs(tvb, 3);
	sxsap = tvb_get_ntohs(tvb, 5);

	if (tree) {
		ti = proto_tree_add_item(tree, proto_hpext, tvb, 0, 7, FALSE);
		hpext_tree = proto_item_add_subtree(ti, ett_hpext);
		proto_tree_add_text(hpext_tree, tvb, 0, 3, "Reserved");
		proto_tree_add_uint(hpext_tree, hf_hpext_dxsap, tvb, 3,
			2, dxsap);
		proto_tree_add_uint(hpext_tree, hf_hpext_sxsap, tvb, 5,
			2, sxsap);
	}

	if (check_col(pinfo->cinfo, COL_INFO))
		col_append_fstr(pinfo->cinfo, COL_INFO,
		    "; HPEXT; DXSAP %s, SXSAP %s",
		    val_to_str(dxsap, xsap_vals, "%04x"),
		    val_to_str(sxsap, xsap_vals, "%04x"));

	if (tvb_length_remaining(tvb, 7) > 0) {
		next_tvb = tvb_new_subset(tvb, 7, -1, -1);
		if (!dissector_try_port(subdissector_table,
		    dxsap, next_tvb, pinfo, tree)) {
			call_dissector(data_handle, next_tvb, pinfo, tree);
		}
	}
}

void
proto_register_hpext(void)
{
	static hf_register_info hf[] = {
		{ &hf_hpext_dxsap,
		{ "DXSAP",	"hpext.dxsap", FT_UINT16, BASE_HEX,
			VALS(xsap_vals), 0x0, "", HFILL }},

		{ &hf_hpext_sxsap,
		{ "SXSAP", "hpext.sxsap", FT_UINT16, BASE_HEX,
			VALS(xsap_vals), 0x0, "", HFILL }},
	};
	static gint *ett[] = {
		&ett_hpext,
	};

	proto_hpext = proto_register_protocol(
	    "HP Extended Local-Link Control", "HPEXT", "hpext");
	proto_register_field_array(proto_hpext, hf, array_length(hf));
	proto_register_subtree_array(ett, array_length(ett));

/* subdissector code */
	subdissector_table = register_dissector_table("hpext.dxsap",
	  "HPEXT XSAP", FT_UINT16, BASE_HEX);

	register_dissector("hpext", dissect_hpext, proto_hpext);
}

void
proto_reg_handoff_hpext(void)
{
	dissector_handle_t hpext_handle;

	data_handle = find_dissector("data");

	hpext_handle = find_dissector("hpext");
	dissector_add("llc.dsap", SAP_HPEXT, hpext_handle);
}
