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wireshark/epan/dissectors/packet-gsm_bsslap.c

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/* 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:
*/
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