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

/* packet-gsm_bsslap.c
 * Routines for Location Services (LCS) Serving Mobile Location Centre - Base Station System (SMLC-BSS) dissection
 * Copyright 2008, Anders Broman <anders.broman[at]ericsson.com>
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 * References: 3GPP TS 48.071 version 7.2.0 Release 7
 */

#include "config.h"

#include <epan/packet.h>
#include <epan/expert.h>

#include "packet-gsm_a_common.h"

void proto_reg_handoff_gsm_bsslap(void);
void proto_register_gsm_bsslap(void);

static dissector_handle_t bsslap_rrlp_handle = NULL;

/* Initialize the protocol and registered fields */
static int proto_gsm_bsslap = -1;
static int hf_gsm_bsslap_msg_type = -1;
int hf_gsm_a_bsslap_elem_id = -1;
static int hf_gsm_bsslap_ta = -1;
static int hf_gsm_bsslap_timer_value = -1;
static int hf_gsm_bsslap_ms_pow = -1;
static int hf_gsm_bsslap_cause = -1;
static int hf_gsm_bsslap_rrlp_flg = -1;
static int hf_gsm_bsslap_tfi = -1;
static int hf_gsm_bsslap_poll_rep = -1;
static int hf_gsm_bsslap_lac = -1;
static int hf_gsm_bsslap_cell_id_disc = -1;
static int hf_gsm_bsslap_encryption_key = -1;

/* Initialize the subtree pointers */
static int ett_gsm_bsslap = -1;
static int ett_bsslap_cell_list = -1;

static expert_field ei_gsm_bsslap_missing_mandatory_element = EI_INIT;
static expert_field ei_gsm_bsslap_not_decoded_yet = EI_INIT;

/* Table 5.1: Element Indentifier codes */
#define BSSLAP_PARAM_TIMING_ADVANCE                  0x01
#define BSSLAP_PARAM_RESERVED_01                     0x08
#define BSSLAP_PARAM_CELL_IDENTITY                   0x09
#define BSSLAP_PARAM_RESERVED_02                     0x0A
#define BSSLAP_PARAM_RESERVED_03                     0x0B
#define BSSLAP_PARAM_RESERVED_04                     0x0C
#define BSSLAP_PARAM_CHANNEL_DESCRIPTION             0x10
#define BSSLAP_PARAM_RESERVED_05                     0x11
#define BSSLAP_PARAM_RESERVED_06                     0x12
#define BSSLAP_PARAM_RESERVED_07                     0x13
#define BSSLAP_PARAM_MEASUREMENT_REPORT              0x14
#define BSSLAP_PARAM_RESERVED_08                     0x15
#define BSSLAP_PARAM_CAUSE                           0x18
#define BSSLAP_PARAM_RRLP_FLAG                       0x19
#define BSSLAP_PARAM_RRLP_IE                         0x1B
#define BSSLAP_PARAM_CELL_IDENTITY_LIST              0x1C
#define BSSLAP_PARAM_ENHANCED_MEASUREMENT_REPORT     0x1D
#define BSSLAP_PARAM_LOCATION_AREA_CODE              0x1E
#define BSSLAP_PARAM_FREQUENCY_LIST                  0x21
#define BSSLAP_PARAM_MS_POWER                        0x22
#define BSSLAP_PARAM_DELTA_TIMER                     0x23
#define BSSLAP_PARAM_SERVING_CELL_IDENTIFIER         0x24
#define BSSLAP_PARAM_ENCRYPTION_KEY                  0x25
#define BSSLAP_PARAM_CIPHER_MODE_SETTING             0x26
#define BSSLAP_PARAM_CHANNEL_MODE                    0x27
#define BSSLAP_PARAM_MULTIRATE_CONFIGURATION         0x28
#define BSSLAP_PARAM_POLLING_REPETITION              0x29
#define BSSLAP_PARAM_PACKET_CHANNEL_DESCRIPTION      0x2A
#define BSSLAP_PARAM_TLLI                            0x2B
#define BSSLAP_PARAM_TFI                             0x2C
#define BSSLAP_PARAM_STARTING_TIME                   0x2D

static const value_string gsm_bsslap_elem_strings[] = {
    {  DE_BLAP_RES1,         "Reserved" },
    {  DE_BLAP_TA,           "Timing Advance" },
    {  DE_BLAP_RES3,         "Reserved" },          /* (note) */
    {  DE_BLAP_RES4,         "Cell Identity" },
    {  DE_BLAP_RES5,         "Reserved" },          /* (note) */
    {  DE_BLAP_RES6,         "Reserved" },          /* (note) */
    {  DE_BLAP_RES7,         "Reserved" },          /* (note) */
    {  DE_BLAP_CH_DESC,      "Channel Description" },
    {  DE_BLAP_RES9,         "Reserved" },          /* (note) */
    {  DE_BLAP_RES10,        "Reserved" },          /* (note) */
    {  DE_BLAP_RES11,        "Reserved" },          /* (note) */
    {  DE_BLAP_MEAS_REP,     "Measurement Report" },
    {  DE_BLAP_RES13,        "Reserved" },          /* (note) */
    {  DE_BLAP_CAUSE,        "Cause" },
    {  DE_BLAP_RRLP_FLG,     "RRLP Flag" },
    {  DE_BLAP_RRLP_IE,      "RRLP IE" },
    {  DE_BLAP_CELL_ID_LIST, "Cell Identity List" },
    {  DE_BLAP_ENH_MEAS_REP, "Enhanced Measurement Report" },
    {  DE_BLAP_LAC,          "Location Area Code" },
    {  DE_BLAP_FREQ_LIST,    "Frequency List" },
    {  DE_BLAP_MS_POW,       "MS Power" },
    {  DE_BLAP_DELTA_TIME,   "Delta Timer" },
    {  DE_BLAP_SERV_CELL_ID, "Serving Cell Identifier" },
    {  DE_BLAP_ENC_KEY,      "Encryption Key (Kc)" },
    {  DE_BLAP_CIP_M_SET,    "Cipher Mode Setting" },
    {  DE_BLAP_CH_MODE,      "Channel Mode" },
    {  DE_BLAP_POLL_REP,     "Polling Repetition" },
    {  DE_BLAP_PKT_CH_DESC,  "Packet Channel Description" },
    {  DE_BLAP_TLLI,         "TLLI" },
    {  DE_BLAP_TFI,          "TFI" },
    {  DE_BLAP_START_TIME,   "Starting Time" },
    { 0,        NULL },
};
value_string_ext gsm_bsslap_elem_strings_ext = VALUE_STRING_EXT_INIT(gsm_bsslap_elem_strings);

/*
 *  NOTE: These values of the codepoints shall not be used as they were used in an earlier version of the
 *  protocol.
 *  All unassigned codes are spare.
 */


#define BSSLAP_TA_REQUEST    1
#define BSSLAP_TA_RESPONSE   2
#define BSSLAP_REJECT       10
#define BSSLAP_RESET        11
#define BSSLAP_ABORT        12
#define BSSLAP_TA_LAYER3    13
#define BSSLAP_MS_POS_CMD   15
#define BSSLAP_MS_POS_RES   16
#define BSSLAP_U_TDOA_REQ   17
#define BSSLAP_U_TDOA_RES   18

/* Table 5.1.1: Message Type codes */
static const value_string gsm_a_bsslap_msg_strings[] = {
    {  0x00,               "Reserved" },
    {  BSSLAP_TA_REQUEST,  "TA REQUEST" },
    {  BSSLAP_TA_RESPONSE, "TA RESPONSE" },
    {  0x04,               "Reserved" },
    {  0x05,               "Reserved" },
    {  BSSLAP_REJECT,      "REJECT" },
    {  BSSLAP_RESET,       "RESET" },
    {  BSSLAP_ABORT,       "ABORT" },
    {  BSSLAP_TA_LAYER3,   "TA LAYER3" },
    {  BSSLAP_MS_POS_CMD,  "MS Position Command" },
    {  BSSLAP_MS_POS_RES,  "MS Position Response" },
    {  BSSLAP_U_TDOA_REQ,  "U-TDOA Request" },
    {  BSSLAP_U_TDOA_RES,  "U-TDOA Response" },
    { 0,            NULL }
};

#define NUM_GSM_BSSLAP_ELEM (sizeof(gsm_bsslap_elem_strings)/sizeof(value_string))
gint ett_gsm_bsslap_elem[NUM_GSM_BSSLAP_ELEM];

/*
 * 5.2 Timing Advance IE
 */
static guint16
de_ta(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo _U_, guint32 offset, guint len _U_, gchar *add_string _U_, int string_len _U_)
{
    guint32 curr_offset;

    curr_offset = offset;
    proto_tree_add_item(tree, hf_gsm_bsslap_ta, tvb, curr_offset, 1, ENC_BIG_ENDIAN);
    curr_offset++;

    return(curr_offset - offset);
}
/*
 * 5.12 Measurement Report IE
 */
#if 0
static guint16
de_meas_rep(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, guint32 offset, guint len, gchar *add_string _U_, int string_len _U_)
{
    guint32 curr_offset;

    curr_offset = offset;
    proto_tree_add_expert(tree, pinfo, &ei_gsm_bsslap_not_decoded_yet, tvb, curr_offset, len);


    return(len);
}
#endif
/*
 * 5.14 Cause IE
 */
static const value_string gsm_bsslap_cause_vals[] = {
    { 0x00, "Congestion" },
    { 0x01, "Channel Mode not supported" },
    { 0x02, "Positioning procedure not supported" },
    { 0x03, "Failure for other radio related events" },
    { 0x04, "Intra-BSS handover" },
    { 0x05, "Supervision Timer Expired" },
    { 0x06, "Inter-BSS handover" },
    { 0x07, "Loss of signalling connection to MS" },
    { 0x08, "Incorrect serving cell identity" },
    { 0x09, "BSSAP-LE Segmentation error" },
    { 0,    NULL }
};

static guint16
de_bsslap_cause(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo _U_, guint32 offset, guint len _U_, gchar *add_string _U_, int string_len _U_)
{
    guint32 curr_offset;

    curr_offset = offset;
    proto_tree_add_item(tree, hf_gsm_bsslap_cause, tvb, curr_offset, 1, ENC_BIG_ENDIAN);
    curr_offset++;

    return(curr_offset - offset);
}
/*
 * 5.15 RRLP Flag IE
 */
static const true_false_string gsm_bsslap_rrlp_flg_vals = {
    "Not a Positioning Command or final response." ,
    "Position Command (SMLC to BSC) or final response (BSC to SMLC)"
};
static guint16
de_rrlp_flg(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo _U_, guint32 offset, guint len _U_, gchar *add_string _U_, int string_len _U_)
{
    guint32 curr_offset;

    curr_offset = offset;
    proto_tree_add_item(tree, hf_gsm_bsslap_rrlp_flg, tvb, curr_offset, 1, ENC_BIG_ENDIAN);
    curr_offset++;

    return(curr_offset - offset);
}
static guint16
de_rrlp_ie(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, guint32 offset, guint len _U_, gchar *add_string _U_, int string_len _U_)
{
    guint32 curr_offset;
    tvbuff_t *rrlp_tvb;
    guint16 length;

    length = tvb_get_ntohs(tvb, offset);

    curr_offset = offset + 2;
    if (length > 0)
    {
        rrlp_tvb = tvb_new_subset_length(tvb, curr_offset, length);
        if (bsslap_rrlp_handle)
            call_dissector(bsslap_rrlp_handle, rrlp_tvb, pinfo, tree);
    }

    curr_offset += length;
    return(curr_offset - offset);
}
/*
 * 5.17 Cell Identity List IE
 */
/*
 * The Cell identification discriminator i is coded as follows:
 */
static const value_string gsm_a_bsslap_cell_id_disc_vals[] = {
    {  0x0, "The whole Cell Global Identification, CGI, is used to identify the 2G cells" },
    {  0x1, "Location Area Code, LAC, and Cell Identify, CI, are used to identify the 2G cells" },
    {  0x2, "3G Cell identification container 1" },
    {  0x3, "3G Cell identification container 2" },
    { 0,            NULL }
};



static guint16
de_cell_id_list(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, guint32 offset, guint len, gchar *add_string _U_, int string_len _U_)
{
    guint32 curr_offset;
    guint8  consumed;
    guint8 cell_id_disc;
    guint8  num_cells;
    proto_item  *item = NULL;
    proto_tree  *subtree = NULL;

    curr_offset = offset;
    cell_id_disc = tvb_get_guint8(tvb,curr_offset);
    num_cells = 0;

    while(len>0){
        num_cells++;
        consumed = 0;
        subtree = proto_tree_add_subtree_format(tree, tvb, curr_offset, -1, ett_bsslap_cell_list, &item, "Cell %u", num_cells);

        if (add_string)
            add_string[0] = '\0';
        proto_tree_add_item(subtree, hf_gsm_bsslap_cell_id_disc, tvb, curr_offset, 1, ENC_BIG_ENDIAN);
        curr_offset++;
        len--;
        switch(cell_id_disc){
            case 0:
                /* The whole Cell Global Identification, CGI, is used to identify the 2G cells. */
                consumed+= be_cell_id_aux(tvb, subtree, pinfo, curr_offset, len, NULL, 0, 0);
                break;
            case 1:
                /* Location Area Code, LAC, and Cell Identify, CI, are used to identify the 2G cells. */
                consumed+= be_cell_id_aux(tvb, subtree, pinfo, curr_offset, len, NULL, 0, 1);
                break;
            case 2:
                /* 3G Cell identification container 1 */
                /* fall trough */
            case 3:
                /* 3G Cell identification container 2 */
                /* fall trough */
            default:
                proto_tree_add_expert(subtree, pinfo, &ei_gsm_bsslap_not_decoded_yet, tvb, curr_offset, len);
                consumed = len;
                break;
        }
        curr_offset += consumed;
        len-=consumed;
        /* lengt is "cell id" + discriminator */
        proto_item_set_len(item, consumed+1);
    }


    return(curr_offset - offset);
}
/*
 * 5.18 Enhanced Measurement Report IE
 * The Enhanced Measurement Results field is encoded as the contents of the
 * ENHANCED MEASUREMENT REPORT message in 3GPP TS 44.018 (excluding the fields:
 * "RR short PD", "Message type" and "Short layer 2 header")...
 */
static guint16
de_enh_meas_rep(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, guint32 offset, guint len, gchar *add_string _U_, int string_len _U_)
{
    guint32 curr_offset;

    curr_offset = offset;
    proto_tree_add_expert(tree, pinfo, &ei_gsm_bsslap_not_decoded_yet, tvb, curr_offset, len);


    return(len);
}
/*
 * 5.19 Location Area Code IE
 */
static guint16
de_lac(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo _U_, guint32 offset, guint len _U_, gchar *add_string _U_, int string_len _U_)
{
    guint32 curr_offset;

    curr_offset = offset;
    proto_tree_add_item(tree, hf_gsm_bsslap_lac, tvb, curr_offset, 1, ENC_BIG_ENDIAN);
    curr_offset++;

    return(curr_offset - offset);
}
/*
 * 5.21 MS Power IE
 */
static guint16
de_ms_pow(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo _U_, guint32 offset, guint len _U_, gchar *add_string _U_, int string_len _U_)
{
    guint32 curr_offset;

    curr_offset = offset;
    proto_tree_add_item(tree, hf_gsm_bsslap_ms_pow, tvb, curr_offset, 1, ENC_BIG_ENDIAN);
    curr_offset++;

    return(curr_offset - offset);
}

/*
 * 5.22 Delta Timer IE
 */
static guint16
de_delta_time(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo _U_, guint32 offset, guint len _U_, gchar *add_string _U_, int string_len _U_)
{
    guint32 curr_offset;

    curr_offset = offset;
    proto_tree_add_item(tree, hf_gsm_bsslap_timer_value, tvb, curr_offset, 1, ENC_BIG_ENDIAN);
    curr_offset++;

    return(curr_offset - offset);
}
/*
 * 5.23 Serving Cell Identifier IE
 * The Serving Cell Identifier IE is encoded as in 3GPP TS 48.008 (excluding IEI and length field).
 */
/*
 * 5.24 Encryption Key
 */
static guint16
de_blap_enc_key(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo _U_, guint32 offset, guint len _U_, gchar *add_string _U_, int string_len _U_)
{
    guint32 curr_offset;

    curr_offset = offset;
    proto_tree_add_item(tree, hf_gsm_bsslap_encryption_key, tvb, curr_offset, 8, ENC_NA);
    curr_offset = curr_offset + 8;

    return(curr_offset - offset);
}
/*
 * 5.25 Cipher Mode Setting IE
 * The Cipher Mode Setting information element is coded as defined in TS 44.018 (excluding IEI).
 */
/*
 * 5.26 Channel Mode IE
 * The Channel Mode information element is coded as defined in TS 44.018 (excluding IEI).
 */
/*
 * 5.27 MultiRate Configuration IE
 * The MultiRate Configuration information element is coded as defined in TS 44.018 (excluding IEI).
 */
/*
 * 5.28 Polling Repetition IE
 */
static guint16
de_poll_rep(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo _U_, guint32 offset, guint len _U_, gchar *add_string _U_, int string_len _U_)
{
    guint32 curr_offset;

    curr_offset = offset;
    proto_tree_add_item(tree, hf_gsm_bsslap_poll_rep, tvb, curr_offset, 1, ENC_BIG_ENDIAN);
    curr_offset++;

    return(curr_offset - offset);
}
/*
 * 5.29 Packet Channel Description IE
 * CSN.1 binary representation of the channel parameters as
 * described in TS 44.018 (CCCH) or TS 44.060 (PCCCH) plus
 * padding bits (binary 0) as required to achieve 4 complete octets
 */
static guint16
de_pkt_ch_desc(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, guint32 offset, guint len, gchar *add_string _U_, int string_len _U_)
{
    guint32 curr_offset;

    curr_offset = offset;
    proto_tree_add_expert(tree, pinfo, &ei_gsm_bsslap_not_decoded_yet, tvb, curr_offset, len);


    return(len);
}
/*
 * 5.31 TFI IE
 * The TFI information element is coded as defined in TS 44.060 (excluding IEI).
 * 44.060:
 * UPLINK_TFI (5 bit field)
 * The Temporary Flow Identity field identifies an uplink Temporary Block Flow (TBF).
 * This field is encoded as a binary number. Range 0 to 31
 */
static guint16
de_tfi(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo _U_, guint32 offset, guint len _U_, gchar *add_string _U_, int string_len _U_)
{
    guint32 curr_offset;

    curr_offset = offset;
    proto_tree_add_item(tree, hf_gsm_bsslap_tfi, tvb, curr_offset, 1, ENC_BIG_ENDIAN);
    curr_offset++;

    return(curr_offset - offset);
}

/*
This enum has been moved to packet-gsm_a_common to
make it possible to use element dissecton from this dissector
in other dissectors.
It is left here as a comment for easier reference.

Note this enum must be of the same size as the element decoding list

typedef enum
{
    /. BSS LAP Elements 5 ./
    DE_BLAP_RES1,           /. Reserved ./
    DE_BLAP_TA,             /. Timing Advance ./
    DE_BLAP_RES3,           /. Reserved ./          /. (note) ./
    DE_BLAP_RES4,           /. Cell Identity ./
    DE_BLAP_RES5,           /. Reserved ./          /. (note) ./
    DE_BLAP_RES6,           /. Reserved ./          /. (note) ./
    DE_BLAP_RES7,           /. Reserved ./          /. (note) ./
    DE_BLAP_CH_DESC,        /. Channel Description ./
    DE_BLAP_RES9,           /. Reserved ./          /. (note) ./
    DE_BLAP_RES10,          /. Reserved ./          /. (note) ./
    DE_BLAP_RES11,          /. Reserved ./          /. (note) ./
    DE_BLAP_MEAS_REP,       /. Measurement Report ./
    DE_BLAP_RES13,          /. Reserved ./          /. (note) ./
    DE_BLAP_CAUSE,          /. Cause ./
    DE_BLAP_RRLP_FLG,       /. RRLP Flag ./
    DE_BLAP_RRLP_IE,        /. RRLP IE ./
    DE_BLAP_CELL_ID_LIST,   /. Cell Identity List ./
    DE_BLAP_ENH_MEAS_REP,   /. Enhanced Measurement Report ./
    DE_BLAP_LAC,            /. Location Area Code ./
    DE_BLAP_FREQ_LIST,      /. Frequency List ./
    DE_BLAP_MS_POW,         /. MS Power ./
    DE_BLAP_DELTA_TIME,     /. Delta Timer ./
    DE_BLAP_SERV_CELL_ID,   /. Serving Cell Identifier ./
    DE_BLAP_ENC_KEY,        /. Encryption Key (Kc) ./
    DE_BLAP_CIP_M_SET,      /. Cipher Mode Setting ./
    DE_BLAP_CH_MODE,        /. Channel Mode ./
    DE_BLAP_POLL_REP,       /. Polling Repetition ./
    DE_BLAP_PKT_CH_DESC,    /. Packet Channel Description ./
    DE_BLAP_TLLI,           /. TLLI ./
    DE_BLAP_TFI,            /. TFI ./
    DE_BLAP_START_TIME,     /. Starting Time ./
    BSSLAP_NONE             /. NONE ./
}
bsslap_elem_idx_t;
*/
elem_fcn bsslap_elem_fcn[] = {
    /* BSS LAP Elements 5 */
    NULL,            /* Reserved */
    de_ta,           /* Timing Advance */
    NULL,            /* Reserved */          /* (note) */
    NULL,            /* "Cell Identity */
    NULL,            /* "Reserved */         /* (note) */
    NULL,            /* "Reserved */         /* (note) */
    NULL,            /* "Reserved */         /* (note) */
    NULL,            /* "Channel Description */
    NULL,            /* "Reserved */         /* (note) */
    NULL,            /* Reserved */          /* (note) */
    NULL,            /* Reserved */          /* (note) */
    de_rr_meas_res,  /* "Measurement Report */
    NULL,            /* "Reserved */         /* (note) */
    de_bsslap_cause, /* "Cause */
    de_rrlp_flg,     /* "RRLP Flag */
    de_rrlp_ie,      /* "RRLP IE */
    de_cell_id_list, /* "Cell Identity List */
    de_enh_meas_rep, /* Enhanced Measurement Report */
    de_lac,          /* "Location Area Code */
    NULL,            /* "Frequency List */
    de_ms_pow,       /* MS Power */
    de_delta_time,   /* Delta Timer */
    NULL,            /* Serving Cell Identifier */
    de_blap_enc_key, /* Encryption Key (Kc) */
    NULL,            /* Cipher Mode Setting */
    NULL,            /* Channel Mode */
    de_poll_rep,     /* Polling Repetition */
    de_pkt_ch_desc,  /* Packet Channel Description */
    NULL,            /* TLLI */
    de_tfi,          /* TFI */
    NULL,            /* Starting Time */
    NULL,            /* NONE */
};

#define NUM_GSM_BSSLAP_MSG (sizeof(gsm_a_bsslap_msg_strings)/sizeof(value_string))
static gint ett_gsm_bsslap_msg[NUM_GSM_BSSLAP_MSG];

/* 4.2.2 TA Response ETSI TS 148 071 V7.2.0 (2007-06) */
static void
dissect_gsm_bsslap_ta_res(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, int offset)
{
    guint32 curr_offset;
    guint32 consumed;
    guint   curr_len;

    curr_offset = offset;
    curr_len = tvb_reported_length_remaining(tvb,offset);

    /* Cell Identity IE / 5.4 M TV 3 */
    ELEM_MAND_TV(BSSLAP_PARAM_CELL_IDENTITY, GSM_A_PDU_TYPE_COMMON, DE_CELL_ID, "Serving Cell Identity", ei_gsm_bsslap_missing_mandatory_element);
    /* Timing Advance IE / 5.2 M TV 2 */
    ELEM_MAND_TV(BSSLAP_PARAM_TIMING_ADVANCE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_TA, NULL, ei_gsm_bsslap_missing_mandatory_element);
    /* Measurement Report IE / 5.12 O TLV 18 */
    ELEM_OPT_TLV(BSSLAP_PARAM_MEASUREMENT_REPORT, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_MEAS_REP, " BSSLAP");
    /* Enhanced Measurement Report IE / 5.18 O TLV 4-n */
    ELEM_OPT_TLV(BSSLAP_PARAM_ENHANCED_MEASUREMENT_REPORT, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_ENH_MEAS_REP, NULL);
    /* Cell Identity List IE / 5.17 O TLV 6-n */
    ELEM_OPT_TLV(BSSLAP_PARAM_CELL_IDENTITY_LIST, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_CELL_ID_LIST, "-Measured Cell");

    return;

}


/* 4.2.3 (void)   ETSI TS 148 071 V7.2.0 (2007-06) */
/* 4.2.4 (void)   ETSI TS 148 071 V7.2.0 (2007-06) */
/* 4.2.5 Reject   ETSI TS 148 071 V7.2.0 (2007-06) */
static void
dissect_gsm_bsslap_reject(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, int offset)
{
    guint32 curr_offset;
    guint32 consumed;
    guint   curr_len;

    curr_offset = offset;
    curr_len = tvb_reported_length_remaining(tvb,offset);

    /* Cause IE / 5.14 M TV 2 */
    ELEM_MAND_TV(BSSLAP_PARAM_CAUSE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_CAUSE, NULL, ei_gsm_bsslap_missing_mandatory_element);

    return;
}

/* 4.2.6 Reset   ETSI TS 148 071 V7.2.0 (2007-06) */
static void
dissect_gsm_bsslap_reset(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, int offset)
{
    guint32 curr_offset;
    guint32 consumed;
    guint   curr_len;

    curr_offset = offset;
    curr_len = tvb_reported_length_remaining(tvb,offset);

    /* Cell Identity IE / 5.4 M TV 3 */
    ELEM_MAND_TV(BSSLAP_PARAM_CELL_IDENTITY, GSM_A_PDU_TYPE_COMMON, DE_CELL_ID, NULL, ei_gsm_bsslap_missing_mandatory_element);
    /* Timing Advance IE / 5.2 M TV 2 */
    ELEM_MAND_TV(BSSLAP_PARAM_TIMING_ADVANCE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_TA, NULL, ei_gsm_bsslap_missing_mandatory_element);
    /* Channel Description IE / 5.8 M TV 4 */
    ELEM_MAND_TV(BSSLAP_PARAM_CHANNEL_DESCRIPTION,GSM_A_PDU_TYPE_RR, DE_RR_CH_DSC, NULL, ei_gsm_bsslap_missing_mandatory_element);
    /* Cause IE / 5.1 M TV 2 */
    ELEM_MAND_TV(BSSLAP_PARAM_CAUSE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_CAUSE, NULL, ei_gsm_bsslap_missing_mandatory_element);
    /* Measurement Report Measurement Report IE / 5.12 O TLV 18 */
    ELEM_OPT_TLV(BSSLAP_PARAM_MEASUREMENT_REPORT, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_MEAS_REP, " BSSLAP");
    /* Enhanced Measurement Report Enhanced Measurement Report IE / 5.18 O TLV 4-n */
    ELEM_OPT_TLV(BSSLAP_PARAM_ENHANCED_MEASUREMENT_REPORT, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_ENH_MEAS_REP, NULL);
    /* Cell Identity List IE / 5.17 O TLV 6-n */
    ELEM_OPT_TLV(BSSLAP_PARAM_CELL_IDENTITY_LIST, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_CELL_ID_LIST, "-Measured Cell");
    /* LAC Location Area Code IE / 5.19 O TV 3 */
    ELEM_OPT_TLV(BSSLAP_PARAM_LOCATION_AREA_CODE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_LAC, NULL);
    /* Frequency List Frequency List IE 5.20 C (note 1) TLV 3-n  */
    ELEM_OPT_TLV(BSSLAP_PARAM_FREQUENCY_LIST, GSM_A_PDU_TYPE_RR, DE_RR_FREQ_LIST, NULL);
    /* Channel Mode IE 5.26 C (notes 2 & 4) TV 2 */
    ELEM_OPT_TV(BSSLAP_PARAM_CHANNEL_MODE, GSM_A_PDU_TYPE_RR, DE_RR_CH_MODE, NULL);
    /* MultiRate Configuration 5.27 C (notes 3 & 4) TLV 4-n */
    ELEM_OPT_TLV(BSSLAP_PARAM_MULTIRATE_CONFIGURATION, GSM_A_PDU_TYPE_RR, DE_RR_MULTIRATE_CONF, NULL);
    /* Packet Channel Description Packet Channel Description IE 5.29 C (note 5) TV 4 */
    ELEM_OPT_TLV(BSSLAP_PARAM_PACKET_CHANNEL_DESCRIPTION, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_PKT_CH_DESC, NULL);
    /* TLLI IE 5.30 C (note 5) TV 5 */
    ELEM_OPT_TV(BSSLAP_PARAM_TLLI, GSM_A_PDU_TYPE_RR, DE_RR_TLLI,NULL);
    /* TFI 5.31 C (note 5) TV 2 */
    ELEM_OPT_TV(BSSLAP_PARAM_TFI, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_TFI,NULL);
    /* Starting Time IE 5.32 C (note 5) TV 3 */
    ELEM_OPT_TV(BSSLAP_PARAM_STARTING_TIME, GSM_A_PDU_TYPE_RR, DE_RR_STARTING_TIME, "TBF Starting Time");
    /* Encryption Key IE 5.24 C (note 4) TV 9 */
    ELEM_OPT_TV(BSSLAP_PARAM_ENCRYPTION_KEY, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_ENC_KEY,NULL);
    /* Cipher Mode Setting IE 5.25 C (note 4) TV 2 */
    ELEM_OPT_TV(BSSLAP_PARAM_CIPHER_MODE_SETTING, GSM_A_PDU_TYPE_RR, DE_RR_CIP_MODE_SET, NULL);
    return;
}

/* 4.2.7 Abort  ETSI TS 148 071 V7.2.0 (2007-06) */
static void
dissect_gsm_bsslap_abort(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, int offset)
{
    guint32 curr_offset;
    guint32 consumed;
    guint   curr_len;

    curr_offset = offset;
    curr_len = tvb_reported_length_remaining(tvb,offset);

    /* Cause IE / 5.14 M TV 2 */
    ELEM_MAND_TV(BSSLAP_PARAM_CAUSE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_CAUSE, NULL, ei_gsm_bsslap_missing_mandatory_element);

    return;
}
/* 4.2.8 TA Layer3  ETSI TS 148 071 V7.2.0 (2007-06) */
static void
dissect_gsm_bsslap_ta_layer3(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, int offset)
{
    guint32 curr_offset;
    guint32 consumed;
    guint   curr_len;

    curr_offset = offset;
    curr_len = tvb_reported_length_remaining(tvb,offset);

    /* Timing Advance IE / 5.2 M TV 2 */
    ELEM_MAND_TV(BSSLAP_PARAM_TIMING_ADVANCE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_TA, NULL, ei_gsm_bsslap_missing_mandatory_element);
    /* Measurement Report IE / 5.12 O TLV 18 */
    ELEM_OPT_TLV(BSSLAP_PARAM_MEASUREMENT_REPORT, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_MEAS_REP, " BSSLAP");
    /* Enhanced Measurement Report IE / 5.18 O TLV 4-n */
    ELEM_OPT_TLV(BSSLAP_PARAM_ENHANCED_MEASUREMENT_REPORT, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_ENH_MEAS_REP, NULL);
    /*Cell Identity List IE / 5.17 O TLV 6-n */
    ELEM_OPT_TLV(BSSLAP_PARAM_CELL_IDENTITY_LIST, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_CELL_ID_LIST, "-Measured Cell");
    return;
}
/* 4.2.9 MS Position Command  ETSI TS 148 071 V7.2.0 (2007-06) */
static void
dissect_gsm_bsslap_ms_pos_cmd(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, int offset)
{
    guint32 curr_offset;
    guint32 consumed;
    guint   curr_len;

    curr_offset = offset;
    curr_len = tvb_reported_length_remaining(tvb,offset);

    /* RRLP flag IE / 5.15 M TV 2 */
    ELEM_MAND_TV(BSSLAP_PARAM_RRLP_FLAG, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_RRLP_FLG, "flag", ei_gsm_bsslap_missing_mandatory_element);
    /* RRLP IE / 5.16 M TLV 3-n */
    ELEM_MAND_TV(BSSLAP_PARAM_RRLP_IE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_RRLP_IE, "RRLP Info", ei_gsm_bsslap_missing_mandatory_element);
    return;
}
/* 4.2.10 MS Position Response   ETSI TS 148 071 V7.2.0 (2007-06) */
static void
dissect_gsm_bsslap_ms_pos_res(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, int offset)
{
    guint32 curr_offset;
    guint32 consumed;
    guint   curr_len;

    curr_offset = offset;
    curr_len = tvb_reported_length_remaining(tvb,offset);

    /* flag RRLP flag IE / 5.15 M TV 2  */
    ELEM_MAND_TV(BSSLAP_PARAM_RRLP_FLAG, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_RRLP_FLG, "flag", ei_gsm_bsslap_missing_mandatory_element);
    /* RRLP Info RRLP IE / 5.16 M TLV 3-n */
    ELEM_MAND_TV(BSSLAP_PARAM_RRLP_IE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_RRLP_IE, "RRLP Info", ei_gsm_bsslap_missing_mandatory_element);
    /* Timing Advance IE / 5.2 O TV 2 */
    ELEM_OPT_TV(BSSLAP_PARAM_TIMING_ADVANCE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_TA, NULL);
    /* Measurement Report IE / 5.12 O TLV 18 */
    ELEM_OPT_TLV(BSSLAP_PARAM_MEASUREMENT_REPORT, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_MEAS_REP, " BSSLAP");
    /* Enhanced Measurement Report IE / 5.18 O TLV 4-n */
    ELEM_OPT_TLV(BSSLAP_PARAM_ENHANCED_MEASUREMENT_REPORT, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_ENH_MEAS_REP, NULL);
    /* Cell Identity List IE / 5.17 O TLV 6-n */
    ELEM_OPT_TLV(BSSLAP_PARAM_CELL_IDENTITY_LIST, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_CELL_ID_LIST, "-Measured Cell");
    return;
}
/* 4.2.11 U-TDOA Request   ETSI TS 148 071 V7.2.0 (2007-06) */
static void
dissect_gsm_bsslap_u_tdoa_req(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, int offset)
{
    guint32 curr_offset;
    guint32 consumed;
    guint   curr_len;

    curr_offset = offset;
    curr_len = tvb_reported_length_remaining(tvb,offset);

    /* Delta Timer IE 5.22 O (note 1) TV 2 */
    ELEM_OPT_TV(BSSLAP_PARAM_DELTA_TIMER, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_DELTA_TIME, NULL);
    /*  Polling Repitition IE 5.28 (note) C (note 2) TV 2 */
    ELEM_OPT_TV(BSSLAP_PARAM_POLLING_REPETITION, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_POLL_REP, NULL);

    return;
}
/* 4.2.12 U-TDOA Response  ETSI TS 148 071 V7.2.0 (2007-06) */
static void
dissect_gsm_bsslap_u_tdoa_res(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, int offset)
{
    guint32 curr_offset;
    guint32 consumed;
    guint   curr_len;

    curr_offset = offset;
    curr_len = tvb_reported_length_remaining(tvb,offset);

    /* Channel Description IE 5.8 M TV 4 */
    ELEM_MAND_TV(BSSLAP_PARAM_CHANNEL_DESCRIPTION,GSM_A_PDU_TYPE_RR, DE_RR_CH_DSC, NULL, ei_gsm_bsslap_missing_mandatory_element);
    /* Serving Cell Identifier Cell Identifier IE 5.23 M TLV 4-n */
    ELEM_MAND_TLV(BSSLAP_PARAM_SERVING_CELL_IDENTIFIER,GSM_A_PDU_TYPE_BSSMAP, BE_CELL_ID, NULL, ei_gsm_bsslap_missing_mandatory_element);
    /* Frequency List IE 5.20 C (note 3) TLV 3-n */
    ELEM_OPT_TLV(BSSLAP_PARAM_FREQUENCY_LIST, GSM_A_PDU_TYPE_RR, DE_RR_FREQ_LIST, NULL);
    /* Timing Advance IE 5.2 O TV 2 */
    ELEM_OPT_TV(BSSLAP_PARAM_TIMING_ADVANCE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_TA, NULL);
    /* MS Power IE 5.21 O TV 2 */
    ELEM_OPT_TV(BSSLAP_PARAM_MS_POWER, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_MS_POW, NULL);
    /* Measurement Report IE 5.12 O TLV 18 */
    ELEM_OPT_TLV(BSSLAP_PARAM_MEASUREMENT_REPORT, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_MEAS_REP, " BSSLAP");
    /* Encryption Key IE 5.24 C (note 4) TV 9 */
    ELEM_OPT_TV(BSSLAP_PARAM_ENCRYPTION_KEY, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_ENC_KEY, NULL);
    /* Cipher Mode Setting IE 5.25 C (note 4) TV 2 */
    ELEM_OPT_TV(BSSLAP_PARAM_CIPHER_MODE_SETTING, GSM_A_PDU_TYPE_RR, DE_RR_CIP_MODE_SET, NULL);
    /* Channel Mode IE 5.26 C (notes 1 & 4)TV 2 */
    ELEM_OPT_TV(BSSLAP_PARAM_CHANNEL_MODE, GSM_A_PDU_TYPE_RR, DE_RR_CH_MODE, NULL);
    /* MultiRate Configuration IE 5.27 C (notes 1 & 4)TLV 4-n */
    ELEM_OPT_TLV(BSSLAP_PARAM_MULTIRATE_CONFIGURATION, GSM_A_PDU_TYPE_RR, DE_RR_MULTIRATE_CONF, NULL);
    /* Cell Identity List IE / 5.17 O TLV 6-n */
    ELEM_OPT_TLV(BSSLAP_PARAM_CELL_IDENTITY_LIST, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_CELL_ID_LIST, "-Measured Cell");
    /* Packet Channel Description IE 5.29 C (note 5) TV 4 */
    ELEM_OPT_TLV(BSSLAP_PARAM_PACKET_CHANNEL_DESCRIPTION, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_PKT_CH_DESC, NULL);
    /* TLLI IE 5.30 C (note 5) TV 5 */
    ELEM_OPT_TV(BSSLAP_PARAM_TLLI, GSM_A_PDU_TYPE_RR, DE_RR_TLLI, NULL);
    /* TFI IE 5.31 C (note 5) TV 2 BSSLAP_PARAM_TFI*/
    ELEM_OPT_TV(BSSLAP_PARAM_TFI, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_TFI, NULL);
    /* Starting Time IE 5.32 C (note 5) TV 3*/
    ELEM_OPT_TV(BSSLAP_PARAM_STARTING_TIME, GSM_A_PDU_TYPE_RR, DE_RR_STARTING_TIME, "TBF Starting Time");
    return;
}


static int
dissect_gsm_bsslap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
    proto_item *item;
    proto_tree *sub_tree;
    int offset=0;
    guint8 octet;

/* Make entries in Protocol column and Info column on summary display */
    col_append_str(pinfo->cinfo, COL_PROTOCOL, "/BSSLAP");
    if (tree) {
        octet = tvb_get_guint8(tvb, offset);
        item = proto_tree_add_item(tree, proto_gsm_bsslap, tvb, 0, -1, ENC_NA);
        sub_tree = proto_item_add_subtree(item, ett_gsm_bsslap);

        /* Message Type IE / 5.1 M V 1 */
        proto_tree_add_item(sub_tree, hf_gsm_bsslap_msg_type, tvb, offset, 1, ENC_BIG_ENDIAN);
        offset++;

        switch (octet){
        case BSSLAP_TA_REQUEST:
            /* Only message type IE */
            break;
        case BSSLAP_TA_RESPONSE:
            dissect_gsm_bsslap_ta_res(tvb, sub_tree, pinfo, offset);
            break;
        case BSSLAP_REJECT:
            dissect_gsm_bsslap_reject(tvb, sub_tree, pinfo, offset);
            break;
        case BSSLAP_RESET:
            dissect_gsm_bsslap_reset(tvb, sub_tree, pinfo, offset);
            break;
        case BSSLAP_ABORT:
            dissect_gsm_bsslap_abort(tvb, sub_tree, pinfo, offset);
            break;
        case BSSLAP_TA_LAYER3:
            dissect_gsm_bsslap_ta_layer3(tvb, sub_tree, pinfo, offset);
            break;
        case BSSLAP_MS_POS_CMD:
            dissect_gsm_bsslap_ms_pos_cmd(tvb, sub_tree, pinfo, offset);
            break;
        case BSSLAP_MS_POS_RES:
            dissect_gsm_bsslap_ms_pos_res(tvb, sub_tree, pinfo, offset);
            break;
        case BSSLAP_U_TDOA_REQ:
            dissect_gsm_bsslap_u_tdoa_req(tvb, sub_tree, pinfo, offset);
            break;
        case BSSLAP_U_TDOA_RES:
            dissect_gsm_bsslap_u_tdoa_res(tvb, sub_tree, pinfo, offset);
            break;
        default:
            break;
        }
    }

    return tvb_captured_length(tvb);
}

void
proto_reg_handoff_gsm_bsslap(void)
{
    bsslap_rrlp_handle = find_dissector_add_dependency("rrlp", proto_gsm_bsslap);
}

void
proto_register_gsm_bsslap(void)
{
    guint       i;
    guint       last_offset;


    /* Setup list of header fields */
    static hf_register_info hf[] = {
        { &hf_gsm_bsslap_msg_type,
            { "Message Type IE",           "gsm_bsslap.msg_type",
            FT_UINT8, BASE_DEC, VALS(gsm_a_bsslap_msg_strings), 0x0,
            NULL, HFILL }
        },
        { &hf_gsm_a_bsslap_elem_id,
            { "Element ID", "gsm_bsslap.elem_id",
            FT_UINT8, BASE_HEX, NULL, 0,
            NULL, HFILL }
        },
        { &hf_gsm_bsslap_ta,
            { "Timing Advance",           "gsm_bsslap.ta",
            FT_UINT8, BASE_HEX, NULL, 0x0,
            NULL, HFILL }
        },
        { &hf_gsm_bsslap_timer_value,
            {"Timer Value", "gsm_bsslap.timerValue",
            FT_UINT8, BASE_DEC, NULL, 0x0,
            NULL, HFILL }
        },

        { &hf_gsm_bsslap_ms_pow,
            {"MS Power", "gsm_bsslap.MS_pow",
            FT_UINT8, BASE_DEC, NULL, 0x0,
            NULL, HFILL }
        },
        { &hf_gsm_bsslap_cause,
            {"Cause", "gsm_bsslap.cause",
            FT_UINT8, BASE_DEC, VALS(gsm_bsslap_cause_vals), 0x0,
            NULL, HFILL }
        },
        { &hf_gsm_bsslap_rrlp_flg,
            {"RRLP Flag", "gsm_bsslap.rrlp_flg",
            FT_BOOLEAN, 8, TFS(&gsm_bsslap_rrlp_flg_vals), 0x01,
            "Cause", HFILL }
        },
        { &hf_gsm_bsslap_tfi,
            {"TFI", "gsm_bsslap.tfi",
            FT_UINT8, BASE_DEC, NULL, 0x1f,
            NULL, HFILL }
        },
        { &hf_gsm_bsslap_poll_rep,
            {"Number of polling repetitions", "gsm_bsslap.poll_rep",
            FT_UINT8, BASE_DEC, NULL, 0x3F,
            NULL, HFILL }
        },
        { &hf_gsm_bsslap_lac,
            {"Location Area Code", "gsm_bsslap.lac",
            FT_UINT8, BASE_DEC, NULL, 0x3f,
            NULL, HFILL }
        },
        { &hf_gsm_bsslap_cell_id_disc,
            {"Cell identification Discriminator", "gsm_bsslap.cell_id_disc",
            FT_UINT8, BASE_DEC, VALS(gsm_a_bsslap_cell_id_disc_vals), 0xf,
            NULL, HFILL }
        },
        { &hf_gsm_bsslap_encryption_key,
            {"Encryption Key (Kc)", "gsm_bsslap.encryption_key",
            FT_BYTES, BASE_NONE, NULL, 0x0,
            NULL, HFILL }
        },
    };

    static ei_register_info ei[] = {
        { &ei_gsm_bsslap_missing_mandatory_element, { "gsm_bsslap.missing_mandatory_element", PI_PROTOCOL, PI_WARN, "Missing Mandatory element, rest of dissection is suspect", EXPFILL }},
        { &ei_gsm_bsslap_not_decoded_yet, { "gsm_bsslap.not_decoded_yet", PI_UNDECODED, PI_WARN, "Not decoded yet", EXPFILL }},
    };

    expert_module_t* expert_gsm_bsslap;

    /* Setup protocol subtree array */
#define NUM_INDIVIDUAL_ELEMS    2
    gint *ett[NUM_INDIVIDUAL_ELEMS + NUM_GSM_BSSLAP_MSG +
          NUM_GSM_BSSLAP_ELEM];

    ett[0] = &ett_gsm_bsslap;
    ett[1] = &ett_bsslap_cell_list;

    last_offset = NUM_INDIVIDUAL_ELEMS;

    for (i=0; i < NUM_GSM_BSSLAP_MSG; i++, last_offset++)
    {
        ett_gsm_bsslap_msg[i] = -1;
        ett[last_offset] = &ett_gsm_bsslap_msg[i];
    }

    for (i=0; i < NUM_GSM_BSSLAP_ELEM; i++, last_offset++)
    {
        ett_gsm_bsslap_elem[i] = -1;
        ett[last_offset] = &ett_gsm_bsslap_elem[i];
    }


/* Register the protocol name and description */
    proto_gsm_bsslap =
        proto_register_protocol("BSS LCS Assistance Protocol",
        "BSSLAP", "bsslap");

/* Required function calls to register the header fields and subtrees used */
    proto_register_field_array(proto_gsm_bsslap, hf, array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));
    expert_gsm_bsslap = expert_register_protocol(proto_gsm_bsslap);
    expert_register_field_array(expert_gsm_bsslap, ei, array_length(ei));

    register_dissector("gsm_bsslap", dissect_gsm_bsslap, proto_gsm_bsslap);
}

/*
 * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 *
 * Local variables:
 * c-basic-offset: 4
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * vi: set shiftwidth=4 tabstop=8 expandtab:
 * :indentSize=4:tabSize=8:noTabs=true:
 */