path: root/epan/dissectors/packet-btl2cap.c

/* packet-btl2cap.c
 * Routines for the Bluetooth L2CAP dissection
 * Copyright 2002, Christoph Scholz <scholz@cs.uni-bonn.de>
 *  From: http://affix.sourceforge.net/archive/ethereal_affix-3.patch
 *
 * Refactored for wireshark checkin
 *   Ronnie Sahlberg 2006
 *
 * $Id$
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * 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 <etypes.h>
#include <epan/emem.h>
#include "packet-bthci_acl.h"
#include "packet-btl2cap.h"

/* Initialize the protocol and registered fields */
static int proto_btl2cap = -1;
static int hf_btl2cap_length = -1;
static int hf_btl2cap_cid = -1;
static int hf_btl2cap_payload = -1;
static int hf_btl2cap_command = -1;
static int hf_btl2cap_cmd_code = -1;
static int hf_btl2cap_cmd_ident = -1;
static int hf_btl2cap_cmd_length = -1;
static int hf_btl2cap_cmd_data = -1;
static int hf_btl2cap_psm = -1;
static int hf_btl2cap_scid = -1;
static int hf_btl2cap_dcid = -1;
static int hf_btl2cap_result = -1;
static int hf_btl2cap_status = -1;
static int hf_btl2cap_rej_reason = -1;
static int hf_btl2cap_sig_mtu = -1;
static int hf_btl2cap_info_mtu = -1;
static int hf_btl2cap_info_flowcontrol = -1;
static int hf_btl2cap_info_retransmission = -1;
static int hf_btl2cap_info_bidirqos = -1;
static int hf_btl2cap_info_type = -1;
static int hf_btl2cap_info_result = -1;
static int hf_btl2cap_continuation_flag = -1;
static int hf_btl2cap_configuration_result = -1;
static int hf_btl2cap_info_extfeatures = -1;
static int hf_btl2cap_option = -1;
static int hf_btl2cap_option_type = -1;
static int hf_btl2cap_option_length = -1;
static int hf_btl2cap_option_mtu = -1;
static int hf_btl2cap_option_flushTO = -1;
static int hf_btl2cap_option_flags = -1;
static int hf_btl2cap_option_service_type = -1;
static int hf_btl2cap_option_tokenrate = -1;
static int hf_btl2cap_option_tokenbucketsize = -1;
static int hf_btl2cap_option_peakbandwidth = -1;
static int hf_btl2cap_option_latency = -1;
static int hf_btl2cap_option_delayvariation = -1;
static int hf_btl2cap_option_retransmissionmode = -1;
static int hf_btl2cap_option_txwindow = -1;
static int hf_btl2cap_option_maxtransmit = -1;
static int hf_btl2cap_option_retransmittimeout = -1;
static int hf_btl2cap_option_monitortimeout = -1;
static int hf_btl2cap_option_mps = -1;
static int hf_btl2cap_control = -1;
static int hf_btl2cap_control_sar = -1;
static int hf_btl2cap_control_reqseq = -1;
static int hf_btl2cap_control_txseq = -1;
static int hf_btl2cap_control_retransmissiondisable = -1;
static int hf_btl2cap_control_supervisory = -1;
static int hf_btl2cap_control_type = -1;
static int hf_btl2cap_fcs = -1;
static int hf_btl2cap_sdulength = -1;
static int hf_btl2cap_continuation_to = -1;
static int hf_btl2cap_reassembled_in = -1;

/* Initialize the subtree pointers */
static gint ett_btl2cap = -1;
static gint ett_btl2cap_cmd = -1;
static gint ett_btl2cap_option = -1;
static gint ett_btl2cap_extfeatures = -1;
static gint ett_btl2cap_control = -1;


/* Initialize dissector table */
dissector_table_t l2cap_psm_dissector_table;

/* This table maps cid values to psm values.
 * The same table is used both for SCID and DCID.
 * For received CIDs we mask the cid with 0x8000 in this table
 */
static emem_tree_t *cid_to_psm_table = NULL;
typedef struct _config_data_t {
	guint8		mode;
	guint8		txwindow;
	emem_tree_t *start_fragments;  /* indexed by pinfo->fd->num */
} config_data_t;
typedef struct _psm_data_t {
	guint16			psm;
	config_data_t	in;
	config_data_t	out;
} psm_data_t;

static const value_string command_code_vals[] = {
	{ 0x01,	"Command Reject" },
	{ 0x02,	"Connection Request" },
	{ 0x03,	"Connection Response" },
	{ 0x04,	"Configure Request" },
	{ 0x05,	"Configure Response" },
	{ 0x06,	"Disconnect Request" },
	{ 0x07,	"Disconnect Response" },
	{ 0x08,	"Echo Request" },
	{ 0x09,	"Echo Response" },
	{ 0x0A,	"Information Request" },
	{ 0x0B,	"Information Response" },
	{ 0, NULL }
};


static const value_string psm_vals[] = {
	{ 0x0001,	"SDP" },
	{ 0x0003,	"RFCOMM" },
	{ 0x0005,	"TCS-BIN" },
	{ 0x0007,	"TCS-BIN-CORDLESS" },
	{ 0x000F,	"BNEP" },
	{ 0x0011,	"HID_CONTROL" },
	{ 0x0013,	"HID_INTERRUPT" },
	{ 0x0015,	"UPnP" },
	{ 0x0017,	"AVCTP" },
	{ 0x0019,	"AVDTP" },
	{ 0x001D,	"UDI_C-Plane" },
	{ 0, NULL }
};


static const value_string result_vals[] = {
	{ 0x0000,	"Connection successful" },
	{ 0x0001,	"Connection pending" },
	{ 0x0002,	"Connection Refused - PSM not supported" },
	{ 0x0003,	"Connection refused - security block" },
	{ 0x0004,	"Connection refused - no resources available" },
	{ 0, NULL }
};

static const value_string configuration_result_vals[] = {
	{ 0x0000, "Success"},
	{ 0x0001, "Failure - unacceptable parameters" },
	{ 0x0002, "Failure - reject (no reason provided)" },
	{ 0x0003, "Failure - unknown options" },
	{ 0, NULL }
};

static const value_string status_vals[] = {
	{ 0x0000,	"No further information available" },
	{ 0x0001,	"Authentication panding" },
	{ 0x0002,	"Authorization pending" },
	{ 0, NULL }
};

static const value_string reason_vals[] = {
	{ 0x0000,	"Command not understood" },
	{ 0x0001,	"Signaling MTU exceeded" },
	{ 0x0002,	"Invalid CID in request" },
	{ 0, NULL }
};

static const value_string info_type_vals[] = {
	{ 0x0001, "Connectionless MTU" },
	{ 0x0002, "Extended Features Mask" },
	{ 0, NULL }
};

static const value_string info_result_vals[] = {
	{ 0x0000, "Success" },
	{ 0x0001, "Not Supported" },
	{ 0, NULL }
};

static const value_string option_servicetype_vals[] = {
	{ 0x00, "No traffic" },
	{ 0x01, "Best effort (Default)" },
	{ 0x02, "Guaranteed" },
	{ 0, NULL }
};

static const value_string option_type_vals[] = {
	{ 0x01, "Maximum Transmission Unit" },
	{ 0x02, "Flush Timeout" },
	{ 0x03, "Quality of Service" },
	{ 0x04, "Retransmission and Flow Control" },
	{ 0, NULL }
};

static const value_string option_retransmissionmode_vals[] = {
	{ 0x00, "Basic Mode" },
	{ 0x01, "Retransmission Mode" },
	{ 0x02, "Flow Control Mode" },
	{ 0, NULL }
};

static const value_string control_sar_vals[] = {
	{ 0x00, "Unsegmented" },
	{ 0x01, "Start" },
	{ 0x02, "End" },
	{ 0x03, "Continuation" },
	{ 0, NULL }
};

static const value_string control_supervisory_vals[] = {
	{ 0x00, "RR" },
	{ 0x01, "REJ" },
	{ 0, NULL }
};

static const value_string control_type_vals[] = {
	{ 0x00, "I-Frame" },
	{ 0x01, "S-Frame" },
	{ 0, NULL }
};

static int 
dissect_comrej(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
	guint16 reason;

	reason = tvb_get_letohs(tvb, offset);
	proto_tree_add_item(tree, hf_btl2cap_rej_reason, tvb, offset, 2, TRUE);
	offset+=2;

	switch(reason){
	case 0x0000: /* Command not understood */
		break;

	case 0x0001: /* Signaling MTU exceeded */
		proto_tree_add_item(tree, hf_btl2cap_sig_mtu, tvb, offset, 2, TRUE);
		offset+=2;
		break;

	case 0x0002: /* Invalid CID in requets */
		proto_tree_add_item(tree, hf_btl2cap_scid, tvb, offset, 2, TRUE);
		offset+=2;

		proto_tree_add_item(tree, hf_btl2cap_dcid, tvb, offset, 2, TRUE);
		offset+=2;

		break;

	default:
		break;
	}

	return offset;
}

static int
dissect_connrequest(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree)
{
	guint16 scid, psm;
	psm_data_t *psm_data;

	psm=tvb_get_letohs(tvb, offset);
	proto_tree_add_item(tree, hf_btl2cap_psm, tvb, offset, 2, TRUE);
	offset+=2;

	scid=tvb_get_letohs(tvb, offset);
	proto_tree_add_item(tree, hf_btl2cap_scid, tvb, offset, 2, TRUE);
	offset+=2;

	if (pinfo->fd->flags.visited == 0) {
		psm_data=se_alloc(sizeof(psm_data_t));
		psm_data->psm=psm;
		psm_data->in.mode=0;
		psm_data->in.txwindow=0;
		psm_data->in.start_fragments=se_tree_create_non_persistent(EMEM_TREE_TYPE_RED_BLACK, "bthci_l2cap fragment starts");
		psm_data->out.mode=0;
		psm_data->out.txwindow=0;
		psm_data->out.start_fragments=se_tree_create_non_persistent(EMEM_TREE_TYPE_RED_BLACK, "bthci_l2cap fragment starts");
		se_tree_insert32(cid_to_psm_table, scid|((pinfo->p2p_dir == P2P_DIR_RECV)?0x8000:0x0000), psm_data);

	}
	return offset;
}


static int
dissect_options(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree, int length, config_data_t *config_data)
{
	proto_item *ti_option=NULL;
	proto_tree *ti_option_subtree=NULL;
	guint8 option_type, option_length;

	while(length>0){
		option_type   = tvb_get_guint8(tvb, offset);
		option_length = tvb_get_guint8(tvb, offset+1);

		ti_option = proto_tree_add_none_format(tree, 
				hf_btl2cap_option, tvb,
				offset, option_length + 2,
				"Option: ");
		ti_option_subtree = proto_item_add_subtree(ti_option, ett_btl2cap_option);
		proto_tree_add_item(ti_option_subtree, hf_btl2cap_option_type, tvb, offset, 1, TRUE);
		proto_tree_add_item(ti_option_subtree, hf_btl2cap_option_length, tvb, offset+1, 1, TRUE);
		offset+=2;

		if(option_length>0){
			switch(option_type){
			case 0x01: /* MTU */
				proto_tree_add_item(ti_option_subtree, hf_btl2cap_option_mtu, tvb, offset, 2, TRUE);
				offset+=2;

				proto_item_append_text(ti_option, "MTU");
				break;

			case 0x02: /* Flush timeout */
				proto_tree_add_item(ti_option_subtree, hf_btl2cap_option_flushTO, tvb, offset, 2, TRUE);
				offset+=2;

				proto_item_append_text(ti_option, "Flush Timeout");
				break;

			case 0x03: /* QOS */
				proto_tree_add_item(ti_option_subtree, hf_btl2cap_option_flags, tvb, offset, 1, TRUE);
				offset++;

				proto_tree_add_item(ti_option_subtree, hf_btl2cap_option_service_type, tvb, offset, 1, TRUE);
				offset++;

				proto_tree_add_item(ti_option_subtree, hf_btl2cap_option_tokenrate, tvb, offset, 4, TRUE);
				offset+=4;

				proto_tree_add_item(ti_option_subtree, hf_btl2cap_option_tokenbucketsize, tvb, offset, 4, TRUE);
				offset+=4;

				proto_tree_add_item(ti_option_subtree, hf_btl2cap_option_peakbandwidth, tvb, offset, 4, TRUE);
				offset+=4;

				proto_tree_add_item(ti_option_subtree, hf_btl2cap_option_latency, tvb, offset, 4, TRUE);
				offset+=4;

				proto_tree_add_item(ti_option_subtree, hf_btl2cap_option_delayvariation, tvb, offset, 4, TRUE);
				offset+=4;

				proto_item_append_text(ti_option, "QOS");
				break;

			case 0x04: /* Retransmission and Flow Control*/
				if(config_data) 
				{
					config_data->mode = tvb_get_guint8(tvb, offset);
					config_data->txwindow = tvb_get_guint8(tvb, offset+1);
				}
				proto_tree_add_item(ti_option_subtree, hf_btl2cap_option_retransmissionmode, tvb, offset, 1, TRUE);
				offset++;

				proto_tree_add_item(ti_option_subtree, hf_btl2cap_option_txwindow, tvb, offset, 1, TRUE);
				offset++;

				proto_tree_add_item(ti_option_subtree, hf_btl2cap_option_maxtransmit, tvb, offset, 1, TRUE);
				offset++;

				proto_tree_add_item(ti_option_subtree, hf_btl2cap_option_retransmittimeout, tvb, offset, 2, TRUE);
				offset+= 2;

				proto_tree_add_item(ti_option_subtree, hf_btl2cap_option_monitortimeout, tvb, offset, 2, TRUE);
				offset+= 2;

				proto_tree_add_item(ti_option_subtree, hf_btl2cap_option_mps, tvb, offset, 2, TRUE);
				offset+= 2;

				proto_item_append_text(ti_option, "Retransmission and Flow Control");
				break;

			default:
				proto_item_append_text(ti_option, "unknown");
				offset+=option_length;
				break;
			}
		}
		length -= (option_length + 2);
	}
	return offset;
}



static int
dissect_configrequest(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree, guint16 length)
{
	psm_data_t *psm_data;
	config_data_t *config_data;
	guint16 dcid;

	dcid = tvb_get_letohs(tvb, offset);
	psm_data=se_tree_lookup32(cid_to_psm_table, dcid|((pinfo->p2p_dir==P2P_DIR_RECV)?0x0000:0x8000));
	proto_tree_add_item(tree, hf_btl2cap_dcid, tvb, offset, 2, TRUE);
	offset+=2;

	proto_tree_add_item(tree, hf_btl2cap_continuation_flag, tvb, offset, 2, TRUE);
	offset+=2;

	if(tvb_length_remaining(tvb, offset)){
		if (psm_data)
			if(pinfo->p2p_dir==P2P_DIR_RECV)
				config_data = &(psm_data->out);
			else
				config_data = &(psm_data->in);
		else
			config_data = NULL;
		offset=dissect_options(tvb, offset, pinfo, tree, length - 4, config_data);
	}

	return offset;
}


static int
dissect_inforequest(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
	proto_tree_add_item(tree, hf_btl2cap_info_type, tvb, offset, 2, TRUE);
	offset+=2;

	return offset;
}

static int
dissect_inforesponse(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
	guint16 info_type;
	proto_item *ti_features=NULL;
	proto_tree *ti_features_subtree=NULL;
	guint32 features;

	info_type=tvb_get_letohs(tvb, offset);
	proto_tree_add_item(tree, hf_btl2cap_info_type, tvb, offset, 2, TRUE);
	offset+=2;

	proto_tree_add_item(tree, hf_btl2cap_info_result, tvb, offset, 2, TRUE);
	offset+=2;

	if(tvb_length_remaining(tvb, offset)) {
		switch(info_type){
		case 0x0001: /* Connectionless MTU */
			proto_tree_add_item(tree, hf_btl2cap_info_mtu, tvb, offset, 2, TRUE);
			offset+=2;

			break;
		case 0x0002: /* Extended Features */
			ti_features = proto_tree_add_none_format(tree, 
					hf_btl2cap_info_extfeatures, tvb,
					offset, 4,
					"Features: ");
			ti_features_subtree = proto_item_add_subtree(ti_features, ett_btl2cap_extfeatures);
			features = tvb_get_letohl(tvb, offset);
			if(features & 0x1)
				proto_item_append_text(ti_features, "FlowControl ");
			if(features & 0x2)
				proto_item_append_text(ti_features, "Retransmission ");
			if(features & 0x4)
				proto_item_append_text(ti_features, "BiDirQOS ");
			proto_tree_add_item(ti_features_subtree, hf_btl2cap_info_flowcontrol, tvb, offset, 1, TRUE);
			proto_tree_add_item(ti_features_subtree, hf_btl2cap_info_retransmission, tvb, offset, 1, TRUE);
			proto_tree_add_item(ti_features_subtree, hf_btl2cap_info_bidirqos, tvb, offset, 1, TRUE);
			offset+=4;

			break;
		default:
			proto_tree_add_item(tree, hf_btl2cap_cmd_data, tvb, offset, -1, TRUE);
			offset+=tvb_length_remaining(tvb, offset);

			break;
		}
	}

	return offset;
}

static int
dissect_configresponse(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree, guint16 length)
{
	psm_data_t *psm_data;
	config_data_t *config_data;
	guint16 scid;

	scid = tvb_get_letohs(tvb, offset);
	psm_data=se_tree_lookup32(cid_to_psm_table, scid|((pinfo->p2p_dir==P2P_DIR_RECV)?0x0000:0x8000));
	proto_tree_add_item(tree, hf_btl2cap_scid, tvb, offset, 2, TRUE);
	offset+=2;

	proto_tree_add_item(tree, hf_btl2cap_continuation_flag, tvb, offset, 2, TRUE);
	offset+=2;

	proto_tree_add_item(tree, hf_btl2cap_configuration_result, tvb, offset, 2, TRUE);
	offset+=2;

	if(tvb_length_remaining(tvb, offset)){
		if (psm_data)
			if(pinfo->p2p_dir==P2P_DIR_RECV)
				config_data = &(psm_data->out);
			else
				config_data = &(psm_data->in);
		else
			config_data = NULL;
		offset=dissect_options(tvb, offset, pinfo, tree, length - 6, config_data);
	}

	return offset;
}

static int 
dissect_connresponse(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree)
{
	guint16 scid, dcid;
	psm_data_t *psm_data;

	dcid = tvb_get_letohs(tvb, offset);
	proto_tree_add_item(tree, hf_btl2cap_dcid, tvb, offset, 2, TRUE);
	offset+=2;

	scid = tvb_get_letohs(tvb, offset);
	proto_tree_add_item(tree, hf_btl2cap_scid, tvb, offset, 2, TRUE);
	offset+=2;

	proto_tree_add_item(tree, hf_btl2cap_result, tvb, offset, 2, TRUE);
	offset+=2;

	proto_tree_add_item(tree, hf_btl2cap_status, tvb, offset, 2, TRUE);
	offset+=2;

	if (pinfo->fd->flags.visited == 0) {
		if((psm_data=se_tree_lookup32(cid_to_psm_table, scid|((pinfo->p2p_dir==P2P_DIR_RECV)?0x0000:0x8000)))){
			se_tree_insert32(cid_to_psm_table, dcid|((pinfo->p2p_dir == P2P_DIR_RECV)?0x8000:0x0000), psm_data);
		}
	}

	return offset;
}


static int
dissect_disconnrequestresponse(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
	guint16 scid, dcid;

	dcid = tvb_get_letohs(tvb, offset);
	proto_tree_add_item(tree, hf_btl2cap_dcid, tvb, offset, 2, TRUE);
	offset+=2;

	scid = tvb_get_letohs(tvb, offset);
	proto_tree_add_item(tree, hf_btl2cap_scid, tvb, offset, 2, TRUE);
	offset+=2;

	return offset;
}

static void dissect_b_frame(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_tree *btl2cap_tree, guint16 psm, guint16 length, int offset)
{
	tvbuff_t *next_tvb;
	next_tvb = tvb_new_subset(tvb, offset, tvb_length_remaining(tvb, offset), length);

	if(check_col(pinfo->cinfo, COL_INFO)){
		col_append_str(pinfo->cinfo, COL_INFO, "Connection oriented channel");
	}

	if(psm){
		proto_item *psm_item;

		psm_item=proto_tree_add_uint(btl2cap_tree, hf_btl2cap_psm, tvb, offset, 0, psm);
		PROTO_ITEM_SET_GENERATED(psm_item);

		/* call next dissector */
		if (!dissector_try_port(l2cap_psm_dissector_table, (guint32) psm,
					next_tvb, pinfo, tree)) {
			/* unknown protocol. declare as data */
			proto_tree_add_item(btl2cap_tree, hf_btl2cap_payload, tvb, offset, length, TRUE);
		}
		offset+=tvb_length_remaining(tvb, offset);
	} else {
		proto_tree_add_item(btl2cap_tree, hf_btl2cap_payload, tvb, offset, length, TRUE);
		offset+=tvb_length_remaining(tvb, offset);
	}
}

typedef struct _sdu_reassembly_t
{
	guint8* reassembled;
	guint8 seq;
	guint32 first_frame;
	guint32 last_frame;
	guint16 tot_len;
	int cur_off;	/* counter used by reassembly */
} sdu_reassembly_t;

static void dissect_i_frame(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_tree *btl2cap_tree, psm_data_t *psm_data, guint16 length, int offset, config_data_t *config_data)
{
	tvbuff_t *next_tvb = NULL;
	guint16 control, segment;
	guint16 sdulen;
	proto_item* ti_control;
	proto_tree* ti_control_subtree;
	sdu_reassembly_t* mfp = NULL;
	guint16 psm = (psm_data?psm_data->psm:0);

	control = tvb_get_letohs(tvb, offset);
	segment = (control & 0xC000) >> 14;
	if(check_col(pinfo->cinfo, COL_INFO)){
		switch(segment)
		{
		case 0:
			col_append_str(pinfo->cinfo, COL_INFO, "[I] Unsegmented SDU");
			break;
		case 1:
			col_append_str(pinfo->cinfo, COL_INFO, "[I] Start SDU");
			break;
		case 2:
			col_append_str(pinfo->cinfo, COL_INFO, "[I] End SDU");
			break;
		case 3:
			col_append_str(pinfo->cinfo, COL_INFO, "[I] Continuation SDU");
			break;
		}
	}
	ti_control = proto_tree_add_none_format(btl2cap_tree, hf_btl2cap_control, tvb,
		offset, 2, "Control: %s reqseq:%d r:%d txseq:%d",
		val_to_str((control & 0xC000) >> 14, control_sar_vals, "unknown"),
		(control & 0x3F00) >> 8,
		(control & 0x0080) >> 7,
		(control & 0x007E) >> 1);
	ti_control_subtree = proto_item_add_subtree(ti_control, ett_btl2cap_control);
	proto_tree_add_item(ti_control_subtree, hf_btl2cap_control_sar, tvb, offset, 2, TRUE);
	proto_tree_add_item(ti_control_subtree, hf_btl2cap_control_reqseq, tvb, offset, 2, TRUE);
	proto_tree_add_item(ti_control_subtree, hf_btl2cap_control_retransmissiondisable, tvb, offset, 2, TRUE);
	proto_tree_add_item(ti_control_subtree, hf_btl2cap_control_txseq, tvb, offset, 2, TRUE);
	proto_tree_add_item(ti_control_subtree, hf_btl2cap_control_type, tvb, offset, 2, TRUE);
	offset += 2;

	/*Segmented frames with SAR = start have an extra SDU length header field*/
	if(segment == 0x01) {
		sdulen = tvb_get_letohs(tvb, offset);
		proto_tree_add_item(btl2cap_tree, hf_btl2cap_sdulength, tvb, offset, 2, TRUE);
		offset += 2;
		length -= 6; /*Control, SDUlength, FCS*/
		if(!pinfo->fd->flags.visited){
			mfp=se_alloc(sizeof(sdu_reassembly_t));
			mfp->first_frame=pinfo->fd->num;
			mfp->last_frame=0;
			mfp->tot_len=sdulen;
			mfp->reassembled=se_alloc(sdulen);
			tvb_memcpy(tvb, mfp->reassembled, offset, length);
			mfp->cur_off=length;
			se_tree_insert32(config_data->start_fragments, pinfo->fd->num, mfp);
		} else {
			mfp=se_tree_lookup32(config_data->start_fragments, pinfo->fd->num);
		}
		if(mfp && mfp->last_frame){
			proto_item *item;
			item=proto_tree_add_uint(btl2cap_tree, hf_btl2cap_reassembled_in, tvb, 0, 0, mfp->last_frame);
			PROTO_ITEM_SET_GENERATED(item);
			if (check_col(pinfo->cinfo, COL_INFO)){
				col_append_fstr(pinfo->cinfo, COL_INFO, "[Reassembled in #%u] ", mfp->last_frame);
			}
		}
	} else {
		length -= 4; /*Control, FCS*/
	}
	if(segment == 0x02 || segment == 0x03) {
		mfp=se_tree_lookup32_le(config_data->start_fragments, pinfo->fd->num);
		if(!pinfo->fd->flags.visited){
			if(mfp && !mfp->last_frame && (mfp->tot_len>=mfp->cur_off+length)){
				tvb_memcpy(tvb, mfp->reassembled+mfp->cur_off, offset, length);
				mfp->cur_off+=length;
				if(segment == 0x02){
					mfp->last_frame=pinfo->fd->num;
				}
			}
		}
		if(mfp){
			proto_item *item;
			item=proto_tree_add_uint(btl2cap_tree, hf_btl2cap_continuation_to, tvb, 0, 0, mfp->first_frame);
			PROTO_ITEM_SET_GENERATED(item);
			if (check_col(pinfo->cinfo, COL_INFO)){
				col_append_fstr(pinfo->cinfo, COL_INFO, "[Continuation to #%u] ", mfp->first_frame);
			}
		}
	}
	if(segment == 0x02 && mfp && mfp->last_frame==pinfo->fd->num){
		next_tvb = tvb_new_real_data((guint8*)mfp->reassembled, mfp->tot_len, mfp->tot_len);
		tvb_set_child_real_data_tvbuff(tvb, next_tvb);
		add_new_data_source(pinfo, next_tvb, "Reassembled L2CAP");
	}
	/*pass up to higher layer if we have a complete packet*/
	if(segment == 0x00) {
		next_tvb = tvb_new_subset(tvb, offset, tvb_length_remaining(tvb, offset) - 2, length);
	}
	if(next_tvb) {
		if(psm){
			proto_item *psm_item;

			psm_item=proto_tree_add_uint(btl2cap_tree, hf_btl2cap_psm, tvb, offset, 0, psm);
			PROTO_ITEM_SET_GENERATED(psm_item);

			/* call next dissector */
			if (!dissector_try_port(l2cap_psm_dissector_table, (guint32) psm,
						next_tvb, pinfo, tree)) {
				/* unknown protocol. declare as data */
				proto_tree_add_item(btl2cap_tree, hf_btl2cap_payload, next_tvb, 0, tvb_length(next_tvb), TRUE);
			}
		} else {
			proto_tree_add_item(btl2cap_tree, hf_btl2cap_payload, next_tvb, 0, tvb_length(next_tvb), TRUE);
		}
	}
	offset+=(tvb_length_remaining(tvb, offset) - 2);
	proto_tree_add_item(btl2cap_tree, hf_btl2cap_fcs, tvb, offset, 2, TRUE);
	offset += 2;
}

static void dissect_s_frame(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree _U_, proto_tree *btl2cap_tree, guint16 psm _U_, guint16 length _U_, int offset, config_data_t *config_data _U_)
{
	proto_item* ti_control;
	proto_tree* ti_control_subtree;
	guint16 control;

	control = tvb_get_letohs(tvb, offset);
	if(check_col(pinfo->cinfo, COL_INFO)){
		switch((control & 0x000C) >> 2)
		{
		case 0:
			col_append_str(pinfo->cinfo, COL_INFO, "[S] Receiver Ready");
			break;
		case 1:
			col_append_str(pinfo->cinfo, COL_INFO, "[S] Reject");
			break;
		default:
			col_append_str(pinfo->cinfo, COL_INFO, "[S] Unknown supervisory frame");
			break;
		}
	}
	ti_control = proto_tree_add_none_format(btl2cap_tree, hf_btl2cap_control, tvb,
		offset, 2, "Control: %s reqseq:%d r:%d",
		val_to_str((control & 0x000C) >> 2, control_supervisory_vals, "unknown"),
		(control & 0x3F00) >> 8,
		(control & 0x0080) >> 7);
	ti_control_subtree = proto_item_add_subtree(ti_control, ett_btl2cap_control);
	proto_tree_add_item(ti_control_subtree, hf_btl2cap_control_reqseq, tvb, offset, 2, TRUE);
	proto_tree_add_item(ti_control_subtree, hf_btl2cap_control_retransmissiondisable, tvb, offset, 2, TRUE);
	proto_tree_add_item(ti_control_subtree, hf_btl2cap_control_supervisory, tvb, offset, 2, TRUE);
	proto_tree_add_item(ti_control_subtree, hf_btl2cap_control_type, tvb, offset, 2, TRUE);
	offset += 2;
	proto_tree_add_item(ti_control_subtree, hf_btl2cap_fcs, tvb, offset, 2, TRUE);
	offset += 2;
}

/* Code to actually dissect the packets
 * This dissector will only be called ontop of BTHCI ACL
 * and this dissector _REQUIRES_ that 
 * pinfo->private_data points to a valid bthci_acl_data_t structure
 */
static void dissect_btl2cap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
	int offset=0;
	proto_item *ti=NULL;
	proto_tree *btl2cap_tree=NULL;
	guint16 length, cid;
	guint16 psm;
	guint16 control;
	tvbuff_t *next_tvb;
	psm_data_t *psm_data;
	bthci_acl_data_t *acl_data;
	btl2cap_data_t *l2cap_data;
	config_data_t *config_data;

	if(check_col(pinfo->cinfo, COL_PROTOCOL)){
		col_set_str(pinfo->cinfo, COL_PROTOCOL, "L2CAP");
	}
	if(check_col(pinfo->cinfo, COL_INFO)){
		col_clear(pinfo->cinfo, COL_INFO);
		col_set_str(pinfo->cinfo, COL_INFO, pinfo->p2p_dir == P2P_DIR_SENT ? "Sent " : "Rcvd ");
	}

	if(tree){
		ti=proto_tree_add_item(tree, proto_btl2cap, tvb, offset, -1, FALSE);
		btl2cap_tree=proto_item_add_subtree(ti, ett_btl2cap);
	}

	length = tvb_get_letohs(tvb, offset);
	proto_tree_add_item(btl2cap_tree, hf_btl2cap_length, tvb, offset, 2, TRUE);
	offset+=2;

	cid = tvb_get_letohs(tvb, offset);
	proto_tree_add_item(btl2cap_tree, hf_btl2cap_cid, tvb, offset, 2, TRUE);
	offset+=2;

	acl_data=(bthci_acl_data_t *)pinfo->private_data;
	l2cap_data=ep_alloc(sizeof(btl2cap_data_t));
	l2cap_data->chandle=acl_data->chandle;
	l2cap_data->cid=cid;
	pinfo->private_data=l2cap_data;

	if(cid==0x0001){ /* This is a command packet*/
		while(offset<(length+4)) {
			proto_tree *btl2cap_cmd_tree=NULL;
			proto_item *ti_command=NULL;
			guint8 cmd_code;
			guint16 cmd_length;

			ti_command=proto_tree_add_none_format(btl2cap_tree, 
					hf_btl2cap_command, tvb,
					offset, length,
					"Command: ");      
			btl2cap_cmd_tree=proto_item_add_subtree(ti_command, ett_btl2cap_cmd);

			cmd_code=tvb_get_guint8(tvb, offset);
			proto_tree_add_item(btl2cap_cmd_tree, hf_btl2cap_cmd_code, tvb, offset, 1, TRUE);
			offset++;

			proto_tree_add_item(btl2cap_cmd_tree, hf_btl2cap_cmd_ident, tvb, offset, 1, TRUE);
			offset++;

			cmd_length=tvb_get_letohs(tvb, offset);
			proto_tree_add_item(btl2cap_cmd_tree, hf_btl2cap_cmd_length, tvb, offset, 2, TRUE);
			proto_item_set_len(ti_command, cmd_length+4);
			offset+=2;

			switch(cmd_code) {
			case 0x01: /* Command Reject */
				offset=dissect_comrej(tvb, offset, pinfo, btl2cap_cmd_tree);
				proto_item_append_text(ti_command, "Command Reject");
				if ((check_col(pinfo->cinfo, COL_INFO))){
					col_append_str(pinfo->cinfo, COL_INFO, "Command Reject");
				}
				break;

			case 0x02: /* Connection Request */
				offset=dissect_connrequest(tvb, offset, pinfo, btl2cap_cmd_tree);
				proto_item_append_text(ti_command, "Connection Request");
				if ((check_col(pinfo->cinfo, COL_INFO))){
					col_append_str(pinfo->cinfo, COL_INFO, "Connection Request");
				}
				break;

			case 0x03: /* Connection Response */
				offset=dissect_connresponse(tvb, offset, pinfo, btl2cap_cmd_tree);
				proto_item_append_text(ti_command, "Connection Response");
				if ((check_col(pinfo->cinfo, COL_INFO))){
					col_append_str(pinfo->cinfo, COL_INFO, "Connection Response");
				}
				break;
			case 0x04: /* Configure Request */
				offset=dissect_configrequest(tvb, offset, pinfo, btl2cap_cmd_tree, cmd_length);
				proto_item_append_text(ti_command, "Configure Request");
				if ((check_col(pinfo->cinfo, COL_INFO))){
					col_append_str(pinfo->cinfo, COL_INFO, "Configure Request");
				}
				break;

			case 0x05: /* Configure Response */
				offset=dissect_configresponse(tvb, offset, pinfo, btl2cap_cmd_tree, cmd_length);
				proto_item_append_text(ti_command, "Configure Response");
				if ((check_col(pinfo->cinfo, COL_INFO))){
					col_append_str(pinfo->cinfo, COL_INFO, "Configure Response");
				}
				break;

			case 0x06: /* Disconnect Request */
				offset=dissect_disconnrequestresponse(tvb, offset, pinfo, btl2cap_cmd_tree);
				proto_item_append_text(ti_command, "Disconnect Request");
				if ((check_col(pinfo->cinfo, COL_INFO))){
					col_append_str(pinfo->cinfo, COL_INFO, "Disconnect Request");
				}
				break;

			case 0x07: /* Disconnect Response */
				offset=dissect_disconnrequestresponse(tvb, offset, pinfo, btl2cap_cmd_tree);   
				proto_item_append_text(ti_command, "Disconnect Response");
				if ((check_col(pinfo->cinfo, COL_INFO))){
					col_append_str(pinfo->cinfo, COL_INFO, "Disconnect Response");
				}
				break;    

			case 0x08: /* Echo Request */
				proto_item_append_text(ti_command, "Echo Request");
				offset+=tvb_length_remaining(tvb, offset);
				if ((check_col(pinfo->cinfo, COL_INFO))){
					col_append_str(pinfo->cinfo, COL_INFO, "Echo Request");
				}
				break;

			case 0x09: /* Echo Response */
				proto_item_append_text(ti_command, "Echo Response");
				offset+=tvb_length_remaining(tvb, offset);
				if ((check_col(pinfo->cinfo, COL_INFO))){
					col_append_str(pinfo->cinfo, COL_INFO, "Echo Response");
				}
				break;

			case 0x0a: /* Information Request */
				offset=dissect_inforequest(tvb, offset, pinfo, btl2cap_cmd_tree);

				proto_item_append_text(ti_command, "Information Request");
				if ((check_col(pinfo->cinfo, COL_INFO))){
					col_append_str(pinfo->cinfo, COL_INFO, "Information Request");
				}
				break;

			case 0x0b: /* Information Response */
				offset=dissect_inforesponse(tvb, offset, pinfo, btl2cap_cmd_tree);
				proto_item_append_text(ti_command, "Information Response");
				if ((check_col(pinfo->cinfo, COL_INFO))){
					col_append_str(pinfo->cinfo, COL_INFO, "Information Response");
				}
				break;

				default:
					proto_tree_add_item(btl2cap_cmd_tree, hf_btl2cap_cmd_data, tvb, offset, -1, TRUE);
					offset+=tvb_length_remaining(tvb, offset);
					break;
			}
		}
	} else if (cid == 0x0002) { /* Connectionless reception channel */
		if(check_col(pinfo->cinfo, COL_INFO)){
			col_append_str(pinfo->cinfo, COL_INFO, "Connectionless reception channel");
		}

		psm = tvb_get_letohs(tvb, offset);
		proto_tree_add_item(btl2cap_tree, hf_btl2cap_psm, tvb, offset, 2, TRUE);
		offset+=2;


		next_tvb = tvb_new_subset(tvb, offset, tvb_length_remaining(tvb, offset), length);

		/* call next dissector */
		if(!dissector_try_port(l2cap_psm_dissector_table, (guint32) psm, 
					next_tvb, pinfo, tree)){
			/* unknown protocol. declare as data */
			proto_tree_add_item(btl2cap_tree, hf_btl2cap_payload, tvb, offset, length, TRUE);
		}
		offset+=tvb_length_remaining(tvb, offset);
	} else if(cid >= 0x0040) { /* Connection oriented channel */
		if((psm_data=se_tree_lookup32(cid_to_psm_table, cid|((pinfo->p2p_dir==P2P_DIR_RECV)?0x0000:0x8000)))){
			psm=psm_data->psm;
			if(pinfo->p2p_dir==P2P_DIR_RECV)
				config_data = &(psm_data->in);
			else
				config_data = &(psm_data->out);
			if(config_data->mode == 0) {
				dissect_b_frame(tvb, pinfo, tree, btl2cap_tree, psm, length, offset);
			} else {
				control = tvb_get_letohs(tvb, offset);
				if(control & 0x1) {
					dissect_s_frame(tvb, pinfo, tree, btl2cap_tree, psm, length, offset, config_data);
				} else {
					dissect_i_frame(tvb, pinfo, tree, btl2cap_tree, psm_data, length, offset, config_data);
				}
			}
		} else {
			psm=0;
			dissect_b_frame(tvb, pinfo, tree, btl2cap_tree, psm, length, offset);
		}

	} else { /* Something else */
		if(check_col(pinfo->cinfo, COL_INFO)){
			col_clear(pinfo->cinfo, COL_INFO);
		}

		proto_tree_add_item(btl2cap_tree, hf_btl2cap_payload, tvb, offset, length, TRUE);
		offset+=length;
	}
}


/* Register the protocol with Wireshark */
void
proto_register_btl2cap(void)
{                 

	/* Setup list of header fields  See Section 1.6.1 for details*/
	static hf_register_info hf[] = {
		{ &hf_btl2cap_length,
			{ "Length",           "btl2cap.length",
				FT_UINT16, BASE_DEC, NULL, 0x0,          
				"L2CAP Payload Length", HFILL }
		},
		{ &hf_btl2cap_cid,
			{ "CID",           "btl2cap.cid",
				FT_UINT16, BASE_HEX, NULL, 0x0,          
				"L2CAP Channel Identifier", HFILL }
		},
		{ &hf_btl2cap_payload,
			{ "Payload",           "btl2cap.payload",
				FT_BYTES, BASE_HEX, NULL, 0x0,          
				"L2CAP Payload", HFILL }
		},
		{ &hf_btl2cap_command,
			{ "Command",           "btl2cap.command",
				FT_NONE, BASE_NONE, NULL, 0x0,          
				"L2CAP Command", HFILL }
		},
		{ &hf_btl2cap_cmd_code,
			{ "Command Code",           "btl2cap.cmd_code",
				FT_UINT8, BASE_HEX, VALS(command_code_vals), 0x0,          
				"L2CAP Command Code", HFILL }
		},
		{ &hf_btl2cap_cmd_ident,
			{ "Command Identifier",           "btl2cap.cmd_ident",
				FT_UINT8, BASE_HEX, NULL, 0x0,          
				"L2CAP Command Identifier", HFILL }
		},
		{ &hf_btl2cap_cmd_length,
			{ "Command Length",           "btl2cap.cmd_length",
				FT_UINT8, BASE_DEC, NULL, 0x0,          
				"L2CAP Command Length", HFILL }
		},
		{ &hf_btl2cap_cmd_data,
			{ "Command Data",           "btl2cap.cmd_data",
				FT_NONE, BASE_NONE, NULL, 0x0,          
				"L2CAP Command Data", HFILL }
		},
		{ &hf_btl2cap_psm,
			{ "PSM",           "btl2cap.psm",
				FT_UINT16, BASE_HEX, VALS(psm_vals), 0x0,          
				"Protocol/Service Multiplexor", HFILL }
		},
		{ &hf_btl2cap_scid,
			{ "Source CID",           "btl2cap.scid",
				FT_UINT16, BASE_HEX, NULL, 0x0,          
				"Source Channel Identifier", HFILL }
		},
		{ &hf_btl2cap_dcid,
			{ "Destination CID",           "btl2cap.dcid",
				FT_UINT16, BASE_HEX, NULL, 0x0,          
				"Destination Channel Identifier", HFILL }
		},
		{ &hf_btl2cap_result,
			{ "Result",           "btl2cap.result",
				FT_UINT16, BASE_HEX, VALS(result_vals), 0x0,          
				"Result", HFILL }
		},
		{ &hf_btl2cap_status,
			{ "Status",           "btl2cap.status",
				FT_UINT16, BASE_HEX, VALS(status_vals), 0x0,          
				"Status", HFILL }
		},
		{ &hf_btl2cap_rej_reason,
			{ "Reason",           "btl2cap.rej_reason",
				FT_UINT16, BASE_HEX, VALS(reason_vals), 0x0,          
				"Reason", HFILL }
		},
		{ &hf_btl2cap_sig_mtu,
			{ "Maximum Signalling MTU",           "btl2cap.sig_mtu",
				FT_UINT16, BASE_DEC, NULL, 0x0,          
				"Maximum Signalling MTU", HFILL }
		},
		{ &hf_btl2cap_info_mtu,
			{ "Remote Entity MTU",           "btl2cap.info_mtu",
				FT_UINT16, BASE_DEC, NULL, 0x0,          
				"Remote entity acceptable connectionless MTU", HFILL }
		},
		{ &hf_btl2cap_info_flowcontrol,
			{ "Flow Control Mode",           "btl2cap.info_flowcontrol",
				FT_UINT8, BASE_DEC, NULL, 0x01,
				"Flow Control mode support", HFILL }
		},
		{ &hf_btl2cap_info_retransmission,
			{ "Retransmission Mode",         "btl2cap.info_retransmission",
				FT_UINT8, BASE_DEC, NULL, 0x02,
				"Retransmission mode support", HFILL }
		},
		{ &hf_btl2cap_info_bidirqos,
			{ "Bi-Directional QOS",          "btl2cap.info_bidirqos",
				FT_UINT8, BASE_DEC, NULL, 0x04,
				"Bi-Directional QOS support", HFILL }
		},
		{ &hf_btl2cap_info_type,
			{ "Information Type",           "btl2cap.info_type",
				FT_UINT16, BASE_HEX, VALS(info_type_vals), 0x0,          
				"Type of implementation-specific information", HFILL }
		},
		{ &hf_btl2cap_info_result,
			{ "Result",           "btl2cap.info_result",
				FT_UINT16, BASE_HEX, VALS(info_result_vals), 0x0,          
				"Information about the success of the request", HFILL }
		},
		{ &hf_btl2cap_info_extfeatures,
			{ "Extended Features",           "btl2cap.info_extfeatures",
				FT_NONE, BASE_NONE, NULL, 0x0,
				"Extended Features Mask", HFILL }
		},
		{ &hf_btl2cap_continuation_flag,
			{ "Continuation Flag",           "btl2cap.continuation",
				FT_BOOLEAN, BASE_DEC, NULL, 0x0001,          
				"Continuation Flag", HFILL }
		},
		{ &hf_btl2cap_configuration_result,
			{ "Result",           "btl2cap.conf_result",
				FT_UINT16, BASE_HEX, VALS(configuration_result_vals), 0x0,
				"Configuration Result", HFILL }
		},
		{ &hf_btl2cap_option_type,
			{ "Type",           "btl2cap.option_type",
				FT_UINT8, BASE_HEX, VALS(option_type_vals), 0x0,          
				"Type of option", HFILL }
		},
		{ &hf_btl2cap_option_length,
			{ "Length",           "btl2cap.option_length",
				FT_UINT8, BASE_DEC, NULL, 0x0,          
				"Number of octets in option payload ", HFILL }
		},
		{ &hf_btl2cap_option_mtu,
			{ "MTU",           "btl2cap.option_mtu",
				FT_UINT16, BASE_DEC, NULL, 0x0,          
				"Maximum Transmission Unit", HFILL }
		},
		{ &hf_btl2cap_option_flushTO,
			{ "Flush Timeout (ms)",           "btl2cap.option_flushto",
				FT_UINT16, BASE_DEC, NULL, 0x0,          
				"Flush Timeout in milliseconds", HFILL }
		},
		{ &hf_btl2cap_option_flags,
			{ "Flags",           "btl2cap.option_flags",
				FT_UINT8, BASE_HEX, NULL, 0x0,          
				"Flags - must be set to 0 (Reserved for future use)", HFILL }
		},
		{ &hf_btl2cap_option_service_type,
			{ "Service Type",           "btl2cap.option_servicetype",
				FT_UINT8, BASE_HEX, VALS(option_servicetype_vals), 0x0,     
				"Level of service required", HFILL }
		},
		{ &hf_btl2cap_option_tokenrate,
			{ "Token Rate (bytes/s)",           "btl2cap.option_tokenrate",
				FT_UINT32, BASE_DEC, NULL, 0x0,          
				"Rate at which traffic credits are granted (bytes/s)", HFILL }
		},
		{ &hf_btl2cap_option_tokenbucketsize,
			{ "Token Bucket Size (bytes)",           "btl2cap.option_tokenbsize",
				FT_UINT32, BASE_DEC, NULL, 0x0,          
				"Size of the token bucket (bytes)", HFILL }
		},
		{ &hf_btl2cap_option_peakbandwidth,
			{ "Peak Bandwidth (bytes/s)",           "btl2cap.option_peakbandwidth",
				FT_UINT32, BASE_DEC, NULL, 0x0,          
				"Limit how fast packets may be sent (bytes/s)", HFILL }
		},
		{ &hf_btl2cap_option_latency,
			{ "Latency (microseconds)",           "btl2cap.option_latency",
				FT_UINT32, BASE_DEC, NULL, 0x0,          
				"Maximal acceptable delay (microseconds)", HFILL }
		},
		{ &hf_btl2cap_option_delayvariation,
			{ "Delay Variation (microseconds)",           "btl2cap.option_delayvar",
				FT_UINT32, BASE_DEC, NULL, 0x0,          
				"Difference between maximum and minimum delay (microseconds)", HFILL }
		},
		{ &hf_btl2cap_option_retransmissionmode,
			{ "Mode",								"btl2cap.retransmissionmode",
				FT_UINT8, BASE_HEX, VALS(option_retransmissionmode_vals), 0x0,
				"Retransmission/Flow Control mode", HFILL }
		},
		{ &hf_btl2cap_option_txwindow,
			{ "TxWindow",							"btl2cap.txwindow",
				FT_UINT8, BASE_DEC, NULL, 0x0,
				"Retransmission window size", HFILL }
		},
		{ &hf_btl2cap_option_maxtransmit,
			{ "MaxTransmit",						"btl2cap.maxtransmit",
				FT_UINT8, BASE_DEC, NULL, 0x0,
				"Maximum I-frame retransmissions", HFILL }
		},
		{ &hf_btl2cap_option_retransmittimeout,
			{ "Retransmit timeout (ms)",			"btl2cap.retransmittimeout",
				FT_UINT16, BASE_DEC, NULL, 0x0,
				"Retransmission timeout (milliseconds)", HFILL }
		},
		{ &hf_btl2cap_option_monitortimeout,
			{ "Monitor Timeout (ms)",				"btl2cap.monitortimeout",
				FT_UINT16, BASE_DEC, NULL, 0x0,
				"S-frame transmission interval (milliseconds)", HFILL }
		},
		{ &hf_btl2cap_option_mps,
			{ "MPS",								"btl2cap.mps",
				FT_UINT16, BASE_DEC, NULL, 0x0,
				"Maximum PDU Payload Size", HFILL }
		},
		{ &hf_btl2cap_option,
			{ "Configuration Parameter Option",           "btl2cap.conf_param_option",
				FT_NONE, BASE_NONE, NULL, 0x0,          
				"Configuration Parameter Option", HFILL }
		},
		{ &hf_btl2cap_control_sar,
			{ "Segmentation and reassembly",           "btl2cap.control_sar",
				FT_UINT16, BASE_HEX, VALS(control_sar_vals), 0xC000,
				"Segmentation and reassembly", HFILL }
		},
		{ &hf_btl2cap_control_reqseq,
			{ "ReqSeq",           "btl2cap.control_reqseq",
				FT_UINT16, BASE_DEC, NULL, 0x3F00,
				"Request Sequence Number", HFILL }
		},
		{ &hf_btl2cap_control_txseq,
			{ "TxSeq",           "btl2cap.control_txseq",
				FT_UINT16, BASE_DEC, NULL, 0x007E,
				"Transmitted Sequence Number", HFILL }
		},
		{ &hf_btl2cap_control_retransmissiondisable,
			{ "R",           "btl2cap.control_retransmissiondisable",
				FT_UINT16, BASE_HEX, NULL, 0x0080,
				"Retransmission Disable", HFILL }
		},
		{ &hf_btl2cap_control_supervisory,
			{ "S",           "btl2cap.control_supervisory",
				FT_UINT16, BASE_HEX, VALS(control_supervisory_vals), 0x000C,
				"Supervisory Function", HFILL }
		},
		{ &hf_btl2cap_control_type,
			{ "Frame Type",           "btl2cap.control_type",
				FT_UINT16, BASE_HEX, VALS(control_type_vals), 0x0001,
				"Frame Type", HFILL }
		},
		{ &hf_btl2cap_control,
			{ "Control field",           "btl2cap.control",
				FT_NONE, BASE_NONE, NULL, 0x0,
				"Control field", HFILL }
		},
		{ &hf_btl2cap_fcs,
			{ "FCS",           "btl2cap.fcs",
				FT_UINT16, BASE_HEX, NULL, 0,
				"Frame Check Sequence", HFILL }
		},
		{ &hf_btl2cap_sdulength,
			{ "SDU Length",           "btl2cap.sdulength",
				FT_UINT16, BASE_DEC, NULL, 0,
				"SDU Length", HFILL }
		},
		{ &hf_btl2cap_reassembled_in,
			{ "This SDU is reassembled in frame",           "btl2cap.reassembled_in",
				FT_FRAMENUM, BASE_NONE, NULL, 0,
				"This SDU is reassembled in frame #", HFILL }
		},
		{ &hf_btl2cap_continuation_to,
			{ "This is a continuation to the SDU in frame",           "btl2cap.continuation_to",
				FT_FRAMENUM, BASE_NONE, NULL, 0,
				"This is a continuation to the SDU in frame #", HFILL }
		}
	};

	/* Setup protocol subtree array */
	static gint *ett[] = {
		&ett_btl2cap,
		&ett_btl2cap_cmd,
		&ett_btl2cap_option,
		&ett_btl2cap_extfeatures,
		&ett_btl2cap_control
	};

	/* Register the protocol name and description */
	proto_btl2cap = proto_register_protocol("Bluetooth L2CAP Packet", "L2CAP", "btl2cap");

	register_dissector("btl2cap", dissect_btl2cap, proto_btl2cap);

	/* subdissector code */
	l2cap_psm_dissector_table = register_dissector_table("btl2cap.psm", "L2CAP PSM", FT_UINT16, BASE_HEX);

	/* Required function calls to register the header fields and subtrees used */
	proto_register_field_array(proto_btl2cap, hf, array_length(hf));
	proto_register_subtree_array(ett, array_length(ett));

	cid_to_psm_table=se_tree_create(EMEM_TREE_TYPE_RED_BLACK, "btl2cap scid to psm");

}


void 
proto_reg_handoff_btl2cap(void)
{

}