/* packet-gsm_bsslap.c * Routines for Location Services (LCS) Serving Mobile Location Centre - Base Station System (SMLC-BSS) dissection * Copyright 2008, Anders Broman * * Wireshark - Network traffic analyzer * By Gerald Combs * 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 #include #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: */