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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: packet-btl2cap.c 29101 2009-07-15 18:39:09Z gerald $
 *
 * 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 <epan/expert.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 pending" },
      { 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) {
            proto_item *pi;;
            sdulen = tvb_get_letohs(tvb, offset);
            pi = proto_tree_add_item(btl2cap_tree, hf_btl2cap_sdulength, tvb, offset, 2, TRUE);
            offset += 2;
            length -= 6; /*Control, SDUlength, FCS*/

            /* Detect malformed data */
            if (sdulen < length) {
                  sdulen = length;
                  expert_add_info_format(pinfo, pi, PI_MALFORMED, PI_WARN, 
                              "SDU length less than length of first packet");
            }

            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_child_real_data(tvb, (guint8*)mfp->reassembled, mfp->tot_len, mfp->tot_len);
            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;
      void* pd_save;

      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;
      pd_save = pinfo->private_data;
      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;
      }
      pinfo->private_data = pd_save;
}


/* 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 Multiplexer", 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, 16, 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)
{

}



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