epan/dissectors/packet-gsm_bsslap.c

   1 /* packet-gsm_bsslap.c
   2  * Routines for Location Services (LCS) Serving Mobile Location Centre - Base Station System (SMLC-BSS) dissection
   3  * Copyright 2008, Anders Broman <anders.broman[at]ericsson.com>
   4  *
   5  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  *
  25  * References: 3GPP TS 48.071 version 7.2.0 Release 7
  26  */
  27
  28 #include "config.h"
  29
  30 #include <glib.h>
  31
  32 #include <epan/packet.h>
  33
  34 #include "packet-gsm_a_common.h"
  35
  36 static dissector_handle_t bsslap_rrlp_handle = NULL;
  37
  38 /* Initialize the protocol and registered fields */
  39 static int proto_gsm_bsslap                     = -1;
  40 static int hf_gsm_bsslap_msg_type       = -1;
  41 int hf_gsm_a_bsslap_elem_id                     = -1;
  42 static int hf_gsm_bsslap_ta                     = -1;
  43 static int hf_gsm_bsslap_timer_value = -1;
  44 static int hf_gsm_bsslap_ms_pow = -1;
  45 static int hf_gsm_bsslap_cause = -1;
  46 static int hf_gsm_bsslap_rrlp_flg = -1;
  47 static int hf_gsm_bsslap_tfi = -1;
  48 static int hf_gsm_bsslap_poll_rep = -1;
  49 static int hf_gsm_bsslap_lac = -1;
  50 static int hf_gsm_bsslap_cell_id_disc = -1;
  51
  52 /* Initialize the subtree pointers */
  53 static int ett_gsm_bsslap = -1;
  54 static int ett_bsslap_cell_list = -1;
  55
  56 /* Table 5.1: Element Indentifier codes */
  57 #define BSSLAP_PARAM_TIMING_ADVANCE                  0x01
  58 #define BSSLAP_PARAM_RESERVED_01                     0x08
  59 #define BSSLAP_PARAM_CELL_IDENTITY                   0x09
  60 #define BSSLAP_PARAM_RESERVED_02                     0x0A
  61 #define BSSLAP_PARAM_RESERVED_03                     0x0B
  62 #define BSSLAP_PARAM_RESERVED_04                     0x0C
  63 #define BSSLAP_PARAM_CHANNEL_DESCRIPTION             0x10
  64 #define BSSLAP_PARAM_RESERVED_05                     0x11
  65 #define BSSLAP_PARAM_RESERVED_06                     0x12
  66 #define BSSLAP_PARAM_RESERVED_07                     0x13
  67 #define BSSLAP_PARAM_MEASUREMENT_REPORT              0x14
  68 #define BSSLAP_PARAM_RESERVED_08                     0x15
  69 #define BSSLAP_PARAM_CAUSE                           0x18
  70 #define BSSLAP_PARAM_RRLP_FLAG                       0x19
  71 #define BSSLAP_PARAM_RRLP_IE                         0x1B
  72 #define BSSLAP_PARAM_CELL_IDENTITY_LIST              0x1C
  73 #define BSSLAP_PARAM_ENHANCED_MEASUREMENT_REPORT     0x1D
  74 #define BSSLAP_PARAM_LOCATION_AREA_CODE              0x1E
  75 #define BSSLAP_PARAM_FREQUENCY_LIST                  0x21
  76 #define BSSLAP_PARAM_MS_POWER                        0x22
  77 #define BSSLAP_PARAM_DELTA_TIMER                     0x23
  78 #define BSSLAP_PARAM_SERVING_CELL_IDENTIFIER         0x24
  79 #define BSSLAP_PARAM_ENCRYPTION_KEY                  0x25
  80 #define BSSLAP_PARAM_CIPHER_MODE_SETTING             0x26
  81 #define BSSLAP_PARAM_CHANNEL_MODE                    0x27
  82 #define BSSLAP_PARAM_MULTIRATE_CONFIGURATION         0x28
  83 #define BSSLAP_PARAM_POLLING_REPETITION              0x29
  84 #define BSSLAP_PARAM_PACKET_CHANNEL_DESCRIPTION      0x2A
  85 #define BSSLAP_PARAM_TLLI                            0x2B
  86 #define BSSLAP_PARAM_TFI                             0x2C
  87 #define BSSLAP_PARAM_STARTING_TIME                   0x2D
  88
  89 static const value_string gsm_bsslap_elem_strings[] = {
  90         {  DE_BLAP_RES1,        "Reserved" },
  91         {  DE_BLAP_TA,  "Timing Advance" },
  92         {  DE_BLAP_RES3,        "Reserved" },                   /* (note) */
  93         {  DE_BLAP_RES4,        "Cell Identity" },
  94         {  DE_BLAP_RES5,        "Reserved" },                   /* (note) */
  95         {  DE_BLAP_RES6,        "Reserved" },                   /* (note) */
  96         {  DE_BLAP_RES7,        "Reserved" },                   /* (note) */
  97         {  DE_BLAP_CH_DESC,     "Channel Description" },
  98         {  DE_BLAP_RES9,        "Reserved" },                   /* (note) */
  99         {  DE_BLAP_RES10,       "Reserved" },                   /* (note) */
 100         {  DE_BLAP_RES11,       "Reserved" },                   /* (note) */
 101         {  DE_BLAP_MEAS_REP,    "Measurement Report" },
 102         {  DE_BLAP_RES13,       "Reserved" },                   /* (note) */
 103         {  DE_BLAP_CAUSE,       "Cause" },
 104         {  DE_BLAP_RRLP_FLG,    "RRLP Flag" },
 105         {  DE_BLAP_RRLP_IE,     "RRLP IE" },
 106         {  DE_BLAP_CELL_ID_LIST,        "Cell Identity List" },
 107         {  DE_BLAP_ENH_MEAS_REP,        "Enhanced Measurement Report" },
 108         {  DE_BLAP_LAC, "Location Area Code" },
 109         {  DE_BLAP_FREQ_LIST,   "Frequency List" },
 110         {  DE_BLAP_MS_POW,      "MS Power" },
 111         {  DE_BLAP_DELTA_TIME,  "Delta Timer" },
 112         {  DE_BLAP_SERV_CELL_ID,        "Serving Cell Identifier" },
 113         {  DE_BLAP_ENC_KEY,     "Encryption Key (Kc)" },
 114         {  DE_BLAP_CIP_M_SET,   "Cipher Mode Setting" },
 115         {  DE_BLAP_CH_MODE,     "Channel Mode" },
 116         {  DE_BLAP_POLL_REP,    "Polling Repetition" },
 117         {  DE_BLAP_PKT_CH_DESC, "Packet Channel Description" },
 118         {  DE_BLAP_TLLI,        "TLLI" },
 119         {  DE_BLAP_TFI, "TFI" },
 120         {  DE_BLAP_START_TIME,  "Starting Time" },
 121         { 0,            NULL },
 122 };
 123 value_string_ext gsm_bsslap_elem_strings_ext = VALUE_STRING_EXT_INIT(gsm_bsslap_elem_strings);
 124
 125 /*
 126  *      NOTE: These values of the codepoints shall not be used as they were used in an earlier version of the
 127  *      protocol.
 128  *      All unassigned codes are spare.
 129  */
 130
 131
 132 #define BSSLAP_TA_REQUEST       1
 133 #define BSSLAP_TA_RESPONSE      2
 134 #define BSSLAP_REJECT           10
 135 #define BSSLAP_RESET            11
 136 #define BSSLAP_ABORT            12
 137 #define BSSLAP_TA_LAYER3        13
 138 #define BSSLAP_MS_POS_CMD       15
 139 #define BSSLAP_MS_POS_RES       16
 140 #define BSSLAP_U_TDOA_REQ       17
 141 #define BSSLAP_U_TDOA_RES       18
 142
 143 /* Table 5.1.1: Message Type codes */
 144 static const value_string gsm_a_bsslap_msg_strings[] = {
 145         {  0x00,                                "Reserved" },
 146         {  BSSLAP_TA_REQUEST,   "TA REQUEST" },
 147         {  BSSLAP_TA_RESPONSE,  "TA RESPONSE" },
 148         {  0x04,                                "Reserved" },
 149         {  0x05,                                "Reserved" },
 150         {  BSSLAP_REJECT,               "REJECT" },
 151         {  BSSLAP_RESET,                "RESET" },
 152         {  BSSLAP_ABORT,                "ABORT" },
 153         {  BSSLAP_TA_LAYER3,    "TA LAYER3" },
 154         {  BSSLAP_MS_POS_CMD,   "MS Position Command" },
 155         {  BSSLAP_MS_POS_RES,   "MS Position Response" },
 156         {  BSSLAP_U_TDOA_REQ,   "U-TDOA Request" },
 157         {  BSSLAP_U_TDOA_RES,   "U-TDOA Response" },
 158         { 0,                    NULL }
 159 };
 160
 161 #define NUM_GSM_BSSLAP_ELEM (sizeof(gsm_bsslap_elem_strings)/sizeof(value_string))
 162 gint ett_gsm_bsslap_elem[NUM_GSM_BSSLAP_ELEM];
 163
 164 /*
 165  * 5.2 Timing Advance IE
 166  */
 167 static guint16
 168 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_)
 169 {
 170         guint32 curr_offset;
 171
 172         curr_offset = offset;
 173         proto_tree_add_item(tree, hf_gsm_bsslap_ta, tvb, curr_offset, 1, ENC_BIG_ENDIAN);
 174         curr_offset++;
 175
 176         return(curr_offset - offset);
 177 }
 178 /*
 179  * 5.12 Measurement Report IE
 180  */
 181 #if 0
 182 static guint16
 183 de_meas_rep(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo _U_, guint32 offset, guint len, gchar *add_string _U_, int string_len _U_)
 184 {
 185         guint32 curr_offset;
 186
 187         curr_offset = offset;
 188         proto_tree_add_text(tree,tvb, curr_offset, len,"Not decoded yet");
 189
 190
 191         return(len);
 192 }
 193 #endif
 194 /*
 195  * 5.14 Cause IE
 196  */
 197 static const value_string gsm_bsslap_cause_vals[] = {
 198         { 0x00, "Congestion" },
 199         { 0x01, "Channel Mode not supported" },
 200         { 0x02, "Positioning procedure not supported" },
 201         { 0x03, "Failure for other radio related events" },
 202         { 0x04, "Intra-BSS handover" },
 203         { 0x05, "Supervision Timer Expired" },
 204         { 0x06, "Inter-BSS handover" },
 205         { 0x07, "Loss of signalling connection to MS" },
 206         { 0x08, "Incorrect serving cell identity" },
 207         { 0x09, "BSSAP-LE Segmentation error" },
 208         { 0,    NULL }
 209 };
 210
 211 static guint16
 212 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_)
 213 {
 214         guint32 curr_offset;
 215
 216         curr_offset = offset;
 217         proto_tree_add_item(tree, hf_gsm_bsslap_cause, tvb, curr_offset, 1, ENC_BIG_ENDIAN);
 218         curr_offset++;
 219
 220         return(curr_offset - offset);
 221 }
 222 /*
 223  * 5.15 RRLP Flag IE
 224  */
 225 static const true_false_string gsm_bsslap_rrlp_flg_vals = {
 226         "Not a Positioning Command or final response." ,
 227         "Position Command (SMLC to BSC) or final response (BSC to SMLC)"
 228 };
 229 static guint16
 230 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_)
 231 {
 232         guint32 curr_offset;
 233
 234         curr_offset = offset;
 235         proto_tree_add_item(tree, hf_gsm_bsslap_rrlp_flg, tvb, curr_offset, 1, ENC_BIG_ENDIAN);
 236         curr_offset++;
 237
 238         return(curr_offset - offset);
 239 }
 240 static guint16
 241 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_)
 242 {
 243    guint32 curr_offset;
 244    tvbuff_t *rrlp_tvb;
 245    guint16 length;
 246
 247    length = tvb_get_ntohs(tvb, offset);
 248
 249    curr_offset = offset + 2;
 250    if (length > 0)
 251    {
 252       rrlp_tvb = tvb_new_subset(tvb, curr_offset, length, length);
 253       if (bsslap_rrlp_handle)
 254          call_dissector(bsslap_rrlp_handle, rrlp_tvb, pinfo, tree);
 255    }
 256
 257    curr_offset += length;
 258    return(curr_offset - offset);
 259 }
 260 /*
 261  * 5.17 Cell Identity List IE
 262  */
 263 /*
 264  * The Cell identification discriminator i is coded as follows:
 265  */
 266 static const value_string gsm_a_bsslap_cell_id_disc_vals[] = {
 267         {  0x0,                         "The whole Cell Global Identification, CGI, is used to identify the 2G cells" },
 268         {  0x1,                         "Location Area Code, LAC, and Cell Identify, CI, are used to identify the 2G cells" },
 269         {  0x2,                         "3G Cell identification container 1" },
 270         {  0x3,                         "3G Cell identification container 2" },
 271         { 0,                    NULL }
 272 };
 273
 274
 275
 276 static guint16
 277 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_)
 278 {
 279         guint32 curr_offset;
 280         guint8  consumed;
 281         guint8 cell_id_disc;
 282         guint8  num_cells;
 283         proto_item      *item = NULL;
 284         proto_tree      *subtree = NULL;
 285
 286         curr_offset = offset;
 287         cell_id_disc = tvb_get_guint8(tvb,curr_offset);
 288         num_cells = 0;
 289
 290         while(len>0){
 291                 num_cells++;
 292                 consumed = 0;
 293                 item = proto_tree_add_text(tree, tvb, curr_offset, -1, "Cell %u", num_cells);
 294                 subtree = proto_item_add_subtree(item, ett_bsslap_cell_list);
 295
 296                 if (add_string)
 297                         add_string[0] = '\0';
 298                 proto_tree_add_item(subtree, hf_gsm_bsslap_cell_id_disc, tvb, curr_offset, 1, ENC_BIG_ENDIAN);
 299                 curr_offset++;
 300                 len--;
 301                 switch(cell_id_disc){
 302                         case 0:
 303                                 /* The whole Cell Global Identification, CGI, is used to identify the 2G cells. */
 304                                 consumed+= be_cell_id_aux(tvb, subtree, pinfo, curr_offset, len, NULL, 0, 0);
 305                                 break;
 306                         case 1:
 307                                 /* Location Area Code, LAC, and Cell Identify, CI, are used to identify the 2G cells. */
 308                                 consumed+= be_cell_id_aux(tvb, subtree, pinfo, curr_offset, len, NULL, 0, 1);
 309                                 break;
 310                         case 2:
 311                                 /* 3G Cell identification container 1 */
 312                                 /* fall trough */
 313                         case 3:
 314                                 /* 3G Cell identification container 2 */
 315                                 /* fall trough */
 316                         default:
 317                                 proto_tree_add_text(subtree,tvb, curr_offset, len,"Not decoded yet");
 318                                 consumed = len;
 319                                 break;
 320                 }
 321                 curr_offset += consumed;
 322                 len-=consumed;
 323                 /* lengt is "cell id" + discriminator */
 324                 proto_item_set_len(item, consumed+1);
 325         }
 326
 327
 328         return(curr_offset - offset);
 329 }
 330 /*
 331  * 5.18 Enhanced Measurement Report IE
 332  * The Enhanced Measurement Results field is encoded as the contents of the
 333  * ENHANCED MEASUREMENT REPORT message in 3GPP TS 44.018 (excluding the fields:
 334  * "RR short PD", "Message type" and "Short layer 2 header")...
 335  */
 336 static guint16
 337 de_enh_meas_rep(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo _U_, guint32 offset, guint len, gchar *add_string _U_, int string_len _U_)
 338 {
 339         guint32 curr_offset;
 340
 341         curr_offset = offset;
 342         proto_tree_add_text(tree,tvb, curr_offset, len,"Not decoded yet");
 343
 344
 345         return(len);
 346 }
 347 /*
 348  * 5.19 Location Area Code IE
 349  */
 350 static guint16
 351 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_)
 352 {
 353         guint32 curr_offset;
 354
 355         curr_offset = offset;
 356         proto_tree_add_item(tree, hf_gsm_bsslap_lac, tvb, curr_offset, 1, ENC_BIG_ENDIAN);
 357         curr_offset++;
 358
 359         return(curr_offset - offset);
 360 }
 361 /*
 362  * 5.21 MS Power IE
 363  */
 364 static guint16
 365 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_)
 366 {
 367         guint32 curr_offset;
 368
 369         curr_offset = offset;
 370         proto_tree_add_item(tree, hf_gsm_bsslap_ms_pow, tvb, curr_offset, 1, ENC_BIG_ENDIAN);
 371         curr_offset++;
 372
 373         return(curr_offset - offset);
 374 }
 375
 376 /*
 377  * 5.22 Delta Timer IE
 378  */
 379 static guint16
 380 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_)
 381 {
 382         guint32 curr_offset;
 383
 384         curr_offset = offset;
 385         proto_tree_add_item(tree, hf_gsm_bsslap_timer_value, tvb, curr_offset, 1, ENC_BIG_ENDIAN);
 386         curr_offset++;
 387
 388         return(curr_offset - offset);
 389 }
 390 /*
 391  * 5.23 Serving Cell Identifier IE
 392  * The Serving Cell Identifier IE is encoded as in 3GPP TS 48.008 (excluding IEI and length field).
 393  */
 394 /*
 395  * 5.24 Encryption Key
 396  */
 397 static guint16
 398 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_)
 399 {
 400         guint32 curr_offset;
 401
 402         curr_offset = offset;
 403         proto_tree_add_text(tree,tvb, curr_offset, 8,"Encryption Key (Kc)");
 404         curr_offset = curr_offset + 8;
 405
 406         return(curr_offset - offset);
 407 }
 408 /*
 409  * 5.25 Cipher Mode Setting IE
 410  * The Cipher Mode Setting information element is coded as defined in TS 44.018 (excluding IEI).
 411  */
 412 /*
 413  * 5.26 Channel Mode IE
 414  * The Channel Mode information element is coded as defined in TS 44.018 (excluding IEI).
 415  */
 416 /*
 417  * 5.27 MultiRate Configuration IE
 418  * The MultiRate Configuration information element is coded as defined in TS 44.018 (excluding IEI).
 419  */
 420 /*
 421  * 5.28 Polling Repetition IE
 422  */
 423 static guint16
 424 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_)
 425 {
 426         guint32 curr_offset;
 427
 428         curr_offset = offset;
 429         proto_tree_add_item(tree, hf_gsm_bsslap_poll_rep, tvb, curr_offset, 1, ENC_BIG_ENDIAN);
 430         curr_offset++;
 431
 432         return(curr_offset - offset);
 433 }
 434 /*
 435  * 5.29 Packet Channel Description IE
 436  * CSN.1 binary representation of the channel parameters as
 437  * described in TS 44.018 (CCCH) or TS 44.060 (PCCCH) plus
 438  * padding bits (binary 0) as required to achieve 4 complete octets
 439  */
 440 static guint16
 441 de_pkt_ch_desc(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo _U_, guint32 offset, guint len, gchar *add_string _U_, int string_len _U_)
 442 {
 443         guint32 curr_offset;
 444
 445         curr_offset = offset;
 446         proto_tree_add_text(tree,tvb, curr_offset, len,"Not decoded yet");
 447
 448
 449         return(len);
 450 }
 451 /*
 452  * 5.31 TFI IE
 453  * The TFI information element is coded as defined in TS 44.060 (excluding IEI).
 454  * 44.060:
 455  * UPLINK_TFI (5 bit field)
 456  * The Temporary Flow Identity field identifies an uplink Temporary Block Flow (TBF).
 457  * This field is encoded as a binary number. Range 0 to 31
 458  */
 459 static guint16
 460 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_)
 461 {
 462         guint32 curr_offset;
 463
 464         curr_offset = offset;
 465         proto_tree_add_item(tree, hf_gsm_bsslap_tfi, tvb, curr_offset, 1, ENC_BIG_ENDIAN);
 466         curr_offset++;
 467
 468         return(curr_offset - offset);
 469 }
 470
 471 /*
 472 This enum has been moved to packet-gsm_a_common to
 473 make it possible to use element dissecton from this dissector
 474 in other dissectors.
 475 It is left here as a comment for easier reference.
 476
 477 Note this enum must be of the same size as the element decoding list
 478
 479 typedef enum
 480 {
 481         /. BSS LAP Elements 5 ./
 482         DE_BLAP_RES1,                   /. Reserved ./
 483         DE_BLAP_TA,                             /. Timing Advance ./
 484         DE_BLAP_RES3,                   /. Reserved ./                  /. (note) ./
 485         DE_BLAP_RES4,                   /. Cell Identity ./
 486         DE_BLAP_RES5,                   /. Reserved ./                  /. (note) ./
 487         DE_BLAP_RES6,                   /. Reserved ./                  /. (note) ./
 488         DE_BLAP_RES7,                   /. Reserved ./                  /. (note) ./
 489         DE_BLAP_CH_DESC,                /. Channel Description ./
 490         DE_BLAP_RES9,                   /. Reserved ./                  /. (note) ./
 491         DE_BLAP_RES10,                  /. Reserved ./                  /. (note) ./
 492         DE_BLAP_RES11,                  /. Reserved ./                  /. (note) ./
 493         DE_BLAP_MEAS_REP,               /. Measurement Report ./
 494         DE_BLAP_RES13,                  /. Reserved ./                  /. (note) ./
 495         DE_BLAP_CAUSE,                  /. Cause ./
 496         DE_BLAP_RRLP_FLG,               /. RRLP Flag ./
 497         DE_BLAP_RRLP_IE,                /. RRLP IE ./
 498         DE_BLAP_CELL_ID_LIST,   /. Cell Identity List ./
 499         DE_BLAP_ENH_MEAS_REP,   /. Enhanced Measurement Report ./
 500         DE_BLAP_LAC,                    /. Location Area Code ./
 501         DE_BLAP_FREQ_LIST,              /. Frequency List ./
 502         DE_BLAP_MS_POW,                 /. MS Power ./
 503         DE_BLAP_DELTA_TIME,             /. Delta Timer ./
 504         DE_BLAP_SERV_CELL_ID,   /. Serving Cell Identifier ./
 505         DE_BLAP_ENC_KEY,                /. Encryption Key (Kc) ./
 506         DE_BLAP_CIP_M_SET,              /. Cipher Mode Setting ./
 507         DE_BLAP_CH_MODE,                /. Channel Mode ./
 508         DE_BLAP_POLL_REP,               /. Polling Repetition ./
 509         DE_BLAP_PKT_CH_DESC,    /. Packet Channel Description ./
 510         DE_BLAP_TLLI,                   /. TLLI ./
 511         DE_BLAP_TFI,                    /. TFI ./
 512         DE_BLAP_START_TIME,             /. Starting Time ./
 513         BSSLAP_NONE                             /. NONE ./
 514 }
 515 bsslap_elem_idx_t;
 516 */
 517 elem_fcn bsslap_elem_fcn[] = {
 518         /* BSS LAP Elements 5 */
 519         NULL,   /* Reserved */
 520         de_ta,  /* Timing Advance */
 521         NULL,   /* Reserved */                  /* (note) */
 522         NULL,   /* "Cell Identity */
 523         NULL,   /* "Reserved */                 /* (note) */
 524         NULL,   /* "Reserved */                 /* (note) */
 525         NULL,   /* "Reserved */                 /* (note) */
 526         NULL,   /* "Channel Description */
 527         NULL,   /* "Reserved */                 /* (note) */
 528         NULL,   /* Reserved */                  /* (note) */
 529         NULL,   /* Reserved */                  /* (note) */
 530         de_rr_meas_res, /* "Measurement Report */
 531         NULL,   /* "Reserved */                 /* (note) */
 532         de_bsslap_cause,        /* "Cause */
 533         de_rrlp_flg,    /* "RRLP Flag */
 534         de_rrlp_ie,     /* "RRLP IE */
 535         de_cell_id_list,        /* "Cell Identity List */
 536         de_enh_meas_rep,        /* Enhanced Measurement Report */
 537         de_lac, /* "Location Area Code */
 538         NULL,   /* "Frequency List */
 539         de_ms_pow,      /* MS Power */
 540         de_delta_time,  /* Delta Timer */
 541         NULL,   /* Serving Cell Identifier */
 542         de_blap_enc_key,        /* Encryption Key (Kc) */
 543         NULL,   /* Cipher Mode Setting */
 544         NULL,   /* Channel Mode */
 545         de_poll_rep,    /* Polling Repetition */
 546         de_pkt_ch_desc, /* Packet Channel Description */
 547         NULL,   /* TLLI */
 548         de_tfi, /* TFI */
 549         NULL,   /* Starting Time */
 550         NULL,   /* NONE */
 551 };
 552
 553 #define NUM_GSM_BSSLAP_MSG (sizeof(gsm_a_bsslap_msg_strings)/sizeof(value_string))
 554 static gint ett_gsm_bsslap_msg[NUM_GSM_BSSLAP_MSG];
 555
 556 /* 4.2.2 TA Response ETSI TS 148 071 V7.2.0 (2007-06) */
 557 static void
 558 dissect_gsm_bsslap_ta_res(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, int offset)
 559 {
 560         guint32 curr_offset;
 561         guint32 consumed;
 562         guint   curr_len;
 563
 564         curr_offset = offset;
 565         curr_len = tvb_length_remaining(tvb,offset);
 566
 567         /* Cell Identity IE / 5.4 M TV 3 */
 568         ELEM_MAND_TV(BSSLAP_PARAM_CELL_IDENTITY, GSM_A_PDU_TYPE_COMMON, DE_CELL_ID, "Serving Cell Identity");
 569         /* Timing Advance IE / 5.2 M TV 2 */
 570         ELEM_MAND_TV(BSSLAP_PARAM_TIMING_ADVANCE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_TA, NULL);
 571         /* Measurement Report IE / 5.12 O TLV 18 */
 572         ELEM_OPT_TLV(BSSLAP_PARAM_MEASUREMENT_REPORT, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_MEAS_REP, " BSSLAP");
 573         /* Enhanced Measurement Report IE / 5.18 O TLV 4-n */
 574         ELEM_OPT_TLV(BSSLAP_PARAM_ENHANCED_MEASUREMENT_REPORT, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_ENH_MEAS_REP, NULL);
 575         /* Cell Identity List IE / 5.17 O TLV 6-n */
 576         ELEM_OPT_TLV(BSSLAP_PARAM_CELL_IDENTITY_LIST, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_CELL_ID_LIST, "-Measured Cell");
 577
 578         return;
 579
 580 }
 581
 582
 583 /* 4.2.3 (void)   ETSI TS 148 071 V7.2.0 (2007-06) */
 584 /* 4.2.4 (void)   ETSI TS 148 071 V7.2.0 (2007-06) */
 585 /* 4.2.5 Reject   ETSI TS 148 071 V7.2.0 (2007-06) */
 586 static void
 587 dissect_gsm_bsslap_reject(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, int offset)
 588 {
 589         guint32 curr_offset;
 590         guint32 consumed;
 591         guint   curr_len;
 592
 593         curr_offset = offset;
 594         curr_len = tvb_length_remaining(tvb,offset);
 595
 596         /* Cause IE / 5.14 M TV 2 */
 597         ELEM_MAND_TV(BSSLAP_PARAM_CAUSE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_CAUSE,NULL);
 598
 599         return;
 600 }
 601
 602 /* 4.2.6 Reset   ETSI TS 148 071 V7.2.0 (2007-06) */
 603 static void
 604 dissect_gsm_bsslap_reset(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, int offset)
 605 {
 606         guint32 curr_offset;
 607         guint32 consumed;
 608         guint   curr_len;
 609
 610         curr_offset = offset;
 611         curr_len = tvb_length_remaining(tvb,offset);
 612
 613         /* Cell Identity IE / 5.4 M TV 3 */
 614         ELEM_MAND_TV(BSSLAP_PARAM_CELL_IDENTITY, GSM_A_PDU_TYPE_COMMON, DE_CELL_ID, NULL);
 615         /* Timing Advance IE / 5.2 M TV 2 */
 616         ELEM_MAND_TV(BSSLAP_PARAM_TIMING_ADVANCE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_TA, NULL);
 617         /* Channel Description IE / 5.8 M TV 4 */
 618         ELEM_MAND_TV(BSSLAP_PARAM_CHANNEL_DESCRIPTION,GSM_A_PDU_TYPE_RR, DE_RR_CH_DSC,NULL);
 619         /* Cause IE / 5.1 M TV 2 */
 620         ELEM_MAND_TV(BSSLAP_PARAM_CAUSE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_CAUSE,NULL);
 621         /* Measurement Report Measurement Report IE / 5.12 O TLV 18 */
 622         ELEM_OPT_TLV(BSSLAP_PARAM_MEASUREMENT_REPORT, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_MEAS_REP, " BSSLAP");
 623         /* Enhanced Measurement Report Enhanced Measurement Report IE / 5.18 O TLV 4-n */
 624         ELEM_OPT_TLV(BSSLAP_PARAM_ENHANCED_MEASUREMENT_REPORT, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_ENH_MEAS_REP, NULL);
 625         /* Cell Identity List IE / 5.17 O TLV 6-n */
 626         ELEM_OPT_TLV(BSSLAP_PARAM_CELL_IDENTITY_LIST, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_CELL_ID_LIST, "-Measured Cell");
 627         /* LAC Location Area Code IE / 5.19 O TV 3 */
 628         ELEM_OPT_TLV(BSSLAP_PARAM_LOCATION_AREA_CODE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_LAC, NULL);
 629         /* Frequency List Frequency List IE 5.20 C (note 1) TLV 3-n  */
 630         ELEM_OPT_TLV(BSSLAP_PARAM_FREQUENCY_LIST, GSM_A_PDU_TYPE_RR, DE_RR_FREQ_LIST, NULL);
 631         /* Channel Mode IE 5.26 C (notes 2 & 4) TV 2 */
 632         ELEM_OPT_TV(BSSLAP_PARAM_CHANNEL_MODE, GSM_A_PDU_TYPE_RR, DE_RR_CH_MODE, NULL);
 633         /* MultiRate Configuration 5.27 C (notes 3 & 4) TLV 4-n */
 634         ELEM_OPT_TLV(BSSLAP_PARAM_MULTIRATE_CONFIGURATION, GSM_A_PDU_TYPE_RR, DE_RR_MULTIRATE_CONF, NULL);
 635         /* Packet Channel Description Packet Channel Description IE 5.29 C (note 5) TV 4 */
 636         ELEM_OPT_TLV(BSSLAP_PARAM_PACKET_CHANNEL_DESCRIPTION, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_PKT_CH_DESC, NULL);
 637         /* TLLI IE 5.30 C (note 5) TV 5 */
 638         ELEM_OPT_TV(BSSLAP_PARAM_TLLI, GSM_A_PDU_TYPE_RR, DE_RR_TLLI,NULL);
 639         /* TFI 5.31 C (note 5) TV 2 */
 640         ELEM_OPT_TV(BSSLAP_PARAM_TFI, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_TFI,NULL);
 641         /* Starting Time IE 5.32 C (note 5) TV 3 */
 642         ELEM_OPT_TV(BSSLAP_PARAM_STARTING_TIME, GSM_A_PDU_TYPE_RR, DE_RR_STARTING_TIME, "TBF Starting Time");
 643         /* Encryption Key IE 5.24 C (note 4) TV 9 */
 644         ELEM_OPT_TV(BSSLAP_PARAM_ENCRYPTION_KEY, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_ENC_KEY,NULL);
 645         /* Cipher Mode Setting IE 5.25 C (note 4) TV 2 */
 646         ELEM_OPT_TV(BSSLAP_PARAM_CIPHER_MODE_SETTING, GSM_A_PDU_TYPE_RR, DE_RR_CIP_MODE_SET, NULL);
 647         return;
 648 }
 649
 650 /* 4.2.7 Abort  ETSI TS 148 071 V7.2.0 (2007-06) */
 651 static void
 652 dissect_gsm_bsslap_abort(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, int offset)
 653 {
 654         guint32 curr_offset;
 655         guint32 consumed;
 656         guint   curr_len;
 657
 658         curr_offset = offset;
 659         curr_len = tvb_length_remaining(tvb,offset);
 660
 661         /* Cause IE / 5.14 M TV 2 */
 662         ELEM_MAND_TV(BSSLAP_PARAM_CAUSE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_CAUSE,NULL);
 663
 664         return;
 665 }
 666 /* 4.2.8 TA Layer3  ETSI TS 148 071 V7.2.0 (2007-06) */
 667 static void
 668 dissect_gsm_bsslap_ta_layer3(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, int offset)
 669 {
 670         guint32 curr_offset;
 671         guint32 consumed;
 672         guint   curr_len;
 673
 674         curr_offset = offset;
 675         curr_len = tvb_length_remaining(tvb,offset);
 676
 677         /* Timing Advance IE / 5.2 M TV 2 */
 678         ELEM_MAND_TV(BSSLAP_PARAM_TIMING_ADVANCE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_TA, NULL);
 679         /* Measurement Report IE / 5.12 O TLV 18 */
 680         ELEM_OPT_TLV(BSSLAP_PARAM_MEASUREMENT_REPORT, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_MEAS_REP, " BSSLAP");
 681         /* Enhanced Measurement Report IE / 5.18 O TLV 4-n */
 682         ELEM_OPT_TLV(BSSLAP_PARAM_ENHANCED_MEASUREMENT_REPORT, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_ENH_MEAS_REP, NULL);
 683         /*Cell Identity List IE / 5.17 O TLV 6-n */
 684         ELEM_OPT_TLV(BSSLAP_PARAM_CELL_IDENTITY_LIST, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_CELL_ID_LIST, "-Measured Cell");
 685         return;
 686 }
 687 /* 4.2.9 MS Position Command  ETSI TS 148 071 V7.2.0 (2007-06) */
 688 static void
 689 dissect_gsm_bsslap_ms_pos_cmd(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, int offset)
 690 {
 691         guint32 curr_offset;
 692         guint32 consumed;
 693         guint   curr_len;
 694
 695         curr_offset = offset;
 696         curr_len = tvb_length_remaining(tvb,offset);
 697
 698         /* RRLP flag IE / 5.15 M TV 2 */
 699         ELEM_MAND_TV(BSSLAP_PARAM_RRLP_FLAG, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_RRLP_FLG,"flag");
 700         /* RRLP IE / 5.16 M TLV 3-n */
 701         ELEM_MAND_TV(BSSLAP_PARAM_RRLP_IE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_RRLP_IE,"RRLP Info");
 702         return;
 703 }
 704 /* 4.2.10 MS Position Response   ETSI TS 148 071 V7.2.0 (2007-06) */
 705 static void
 706 dissect_gsm_bsslap_ms_pos_res(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, int offset)
 707 {
 708         guint32 curr_offset;
 709         guint32 consumed;
 710         guint   curr_len;
 711
 712         curr_offset = offset;
 713         curr_len = tvb_length_remaining(tvb,offset);
 714
 715         /* flag RRLP flag IE / 5.15 M TV 2  */
 716         ELEM_MAND_TV(BSSLAP_PARAM_RRLP_FLAG, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_RRLP_FLG,"flag");
 717         /* RRLP Info RRLP IE / 5.16 M TLV 3-n */
 718         ELEM_MAND_TV(BSSLAP_PARAM_RRLP_IE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_RRLP_IE,"RRLP Info");
 719         /* Timing Advance IE / 5.2 O TV 2 */
 720         ELEM_OPT_TV(BSSLAP_PARAM_TIMING_ADVANCE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_TA, NULL);
 721         /* Measurement Report IE / 5.12 O TLV 18 */
 722         ELEM_OPT_TLV(BSSLAP_PARAM_MEASUREMENT_REPORT, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_MEAS_REP, " BSSLAP");
 723         /* Enhanced Measurement Report IE / 5.18 O TLV 4-n */
 724         ELEM_OPT_TLV(BSSLAP_PARAM_ENHANCED_MEASUREMENT_REPORT, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_ENH_MEAS_REP, NULL);
 725         /* Cell Identity List IE / 5.17 O TLV 6-n */
 726         ELEM_OPT_TLV(BSSLAP_PARAM_CELL_IDENTITY_LIST, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_CELL_ID_LIST, "-Measured Cell");
 727         return;
 728 }
 729 /* 4.2.11 U-TDOA Request   ETSI TS 148 071 V7.2.0 (2007-06) */
 730 static void
 731 dissect_gsm_bsslap_u_tdoa_req(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, int offset)
 732 {
 733         guint32 curr_offset;
 734         guint32 consumed;
 735         guint   curr_len;
 736
 737         curr_offset = offset;
 738         curr_len = tvb_length_remaining(tvb,offset);
 739
 740         /* Delta Timer IE 5.22 O (note 1) TV 2 */
 741         ELEM_OPT_TV(BSSLAP_PARAM_DELTA_TIMER, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_DELTA_TIME, NULL);
 742         /*      Polling Repitition IE 5.28 (note) C (note 2) TV 2 */
 743         ELEM_OPT_TV(BSSLAP_PARAM_POLLING_REPETITION, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_POLL_REP, NULL);
 744
 745         return;
 746 }
 747 /* 4.2.12 U-TDOA Response  ETSI TS 148 071 V7.2.0 (2007-06) */
 748 static void
 749 dissect_gsm_bsslap_u_tdoa_res(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, int offset)
 750 {
 751         guint32 curr_offset;
 752         guint32 consumed;
 753         guint   curr_len;
 754
 755         curr_offset = offset;
 756         curr_len = tvb_length_remaining(tvb,offset);
 757
 758         /* Channel Description IE 5.8 M TV 4 */
 759         ELEM_MAND_TV(BSSLAP_PARAM_CHANNEL_DESCRIPTION,GSM_A_PDU_TYPE_RR, DE_RR_CH_DSC, NULL);
 760         /* Serving Cell Identifier Cell Identifier IE 5.23 M TLV 4-n */
 761         ELEM_MAND_TLV(BSSLAP_PARAM_SERVING_CELL_IDENTIFIER,GSM_A_PDU_TYPE_BSSMAP, BE_CELL_ID, NULL);
 762         /* Frequency List IE 5.20 C (note 3) TLV 3-n */
 763         ELEM_OPT_TLV(BSSLAP_PARAM_FREQUENCY_LIST, GSM_A_PDU_TYPE_RR, DE_RR_FREQ_LIST, NULL);
 764         /* Timing Advance IE 5.2 O TV 2 */
 765         ELEM_OPT_TV(BSSLAP_PARAM_TIMING_ADVANCE, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_TA, NULL);
 766         /* MS Power IE 5.21 O TV 2 */
 767         ELEM_OPT_TV(BSSLAP_PARAM_MS_POWER, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_MS_POW, NULL);
 768         /* Measurement Report IE 5.12 O TLV 18 */
 769         ELEM_OPT_TLV(BSSLAP_PARAM_MEASUREMENT_REPORT, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_MEAS_REP, " BSSLAP");
 770         /* Encryption Key IE 5.24 C (note 4) TV 9 */
 771         ELEM_OPT_TV(BSSLAP_PARAM_ENCRYPTION_KEY, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_ENC_KEY, NULL);
 772         /* Cipher Mode Setting IE 5.25 C (note 4) TV 2 */
 773         ELEM_OPT_TV(BSSLAP_PARAM_CIPHER_MODE_SETTING, GSM_A_PDU_TYPE_RR, DE_RR_CIP_MODE_SET, NULL);
 774         /* Channel Mode IE 5.26 C (notes 1 & 4)TV 2 */
 775         ELEM_OPT_TV(BSSLAP_PARAM_CHANNEL_MODE, GSM_A_PDU_TYPE_RR, DE_RR_CH_MODE, NULL);
 776         /* MultiRate Configuration IE 5.27 C (notes 1 & 4)TLV 4-n */
 777         ELEM_OPT_TLV(BSSLAP_PARAM_MULTIRATE_CONFIGURATION, GSM_A_PDU_TYPE_RR, DE_RR_MULTIRATE_CONF, NULL);
 778         /* Cell Identity List IE / 5.17 O TLV 6-n */
 779         ELEM_OPT_TLV(BSSLAP_PARAM_CELL_IDENTITY_LIST, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_CELL_ID_LIST, "-Measured Cell");
 780         /* Packet Channel Description IE 5.29 C (note 5) TV 4 */
 781         ELEM_OPT_TLV(BSSLAP_PARAM_PACKET_CHANNEL_DESCRIPTION, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_PKT_CH_DESC, NULL);
 782         /* TLLI IE 5.30 C (note 5) TV 5 */
 783         ELEM_OPT_TV(BSSLAP_PARAM_TLLI, GSM_A_PDU_TYPE_RR, DE_RR_TLLI, NULL);
 784         /* TFI IE 5.31 C (note 5) TV 2 BSSLAP_PARAM_TFI*/
 785         ELEM_OPT_TV(BSSLAP_PARAM_TFI, GSM_A_PDU_TYPE_BSSLAP, DE_BLAP_TFI, NULL);
 786         /* Starting Time IE 5.32 C (note 5) TV 3*/
 787         ELEM_OPT_TV(BSSLAP_PARAM_STARTING_TIME, GSM_A_PDU_TYPE_RR, DE_RR_STARTING_TIME, "TBF Starting Time");
 788         return;
 789 }
 790
 791
 792 static void
 793 dissect_gsm_bsslap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 794 {
 795         proto_item *item;
 796         proto_tree *sub_tree;
 797         int     offset=0;
 798         guint8 octet;
 799
 800 /* Make entries in Protocol column and Info column on summary display */
 801         col_append_str(pinfo->cinfo, COL_PROTOCOL, "/BSSLAP");
 802         if (tree) {
 803                 octet = tvb_get_guint8(tvb, offset);
 804                 item = proto_tree_add_item(tree, proto_gsm_bsslap, tvb, 0, -1, ENC_NA);
 805                 sub_tree = proto_item_add_subtree(item, ett_gsm_bsslap);
 806
 807                 /* Message Type IE / 5.1 M V 1 */
 808                 proto_tree_add_item(sub_tree, hf_gsm_bsslap_msg_type, tvb, offset, 1, ENC_BIG_ENDIAN);
 809                 offset++;
 810
 811                 switch (octet){
 812                 case BSSLAP_TA_REQUEST:
 813                         /* Only message type IE */
 814                         break;
 815                 case BSSLAP_TA_RESPONSE:
 816                         dissect_gsm_bsslap_ta_res(tvb, sub_tree, pinfo, offset);
 817                         break;
 818                 case BSSLAP_REJECT:
 819                         dissect_gsm_bsslap_reject(tvb, sub_tree, pinfo, offset);
 820                         break;
 821                 case BSSLAP_RESET:
 822                         dissect_gsm_bsslap_reset(tvb, sub_tree, pinfo, offset);
 823                         break;
 824                 case BSSLAP_ABORT:
 825                         dissect_gsm_bsslap_abort(tvb, sub_tree, pinfo, offset);
 826                         break;
 827                 case BSSLAP_TA_LAYER3:
 828                         dissect_gsm_bsslap_ta_layer3(tvb, sub_tree, pinfo, offset);
 829                         break;
 830                 case BSSLAP_MS_POS_CMD:
 831                         dissect_gsm_bsslap_ms_pos_cmd(tvb, sub_tree, pinfo, offset);
 832                         break;
 833                 case BSSLAP_MS_POS_RES:
 834                         dissect_gsm_bsslap_ms_pos_res(tvb, sub_tree, pinfo, offset);
 835                         break;
 836                 case BSSLAP_U_TDOA_REQ:
 837                         dissect_gsm_bsslap_u_tdoa_req(tvb, sub_tree, pinfo, offset);
 838                         break;
 839                 case BSSLAP_U_TDOA_RES:
 840                         dissect_gsm_bsslap_u_tdoa_res(tvb, sub_tree, pinfo, offset);
 841                         break;
 842                 default:
 843                         break;
 844                 }
 845         }
 846
 847
 848 }
 849
 850 void
 851 proto_reg_handoff_gsm_bsslap(void)
 852 {
 853         bsslap_rrlp_handle = find_dissector("rrlp");
 854 }
 855
 856 void
 857 proto_register_gsm_bsslap(void)
 858 {
 859         guint           i;
 860         guint           last_offset;
 861
 862
 863         /* Setup list of header fields */
 864         static hf_register_info hf[] = {
 865                 { &hf_gsm_bsslap_msg_type,
 866                         { "Message Type IE",           "gsm_bsslap.msg_type",
 867                         FT_UINT8, BASE_DEC, VALS(gsm_a_bsslap_msg_strings), 0x0,
 868                         NULL, HFILL }
 869                 },
 870                 { &hf_gsm_a_bsslap_elem_id,
 871                         { "Element ID", "gsm_bsslap.elem_id",
 872                         FT_UINT8, BASE_HEX, NULL, 0,
 873                         NULL, HFILL }
 874                 },
 875                 { &hf_gsm_bsslap_ta,
 876                         { "Timing Advance",           "gsm_bsslap.ta",
 877                         FT_UINT8, BASE_HEX, NULL, 0x0,
 878                         NULL, HFILL }
 879                 },
 880         { &hf_gsm_bsslap_timer_value,
 881                         {"Timer Value", "gsm_bsslap.timerValue",
 882                         FT_UINT8, BASE_DEC, NULL, 0x0,
 883                         NULL, HFILL }
 884                 },
 885
 886         { &hf_gsm_bsslap_ms_pow,
 887                         {"MS Power", "gsm_bsslap.MS_pow",
 888                         FT_UINT8, BASE_DEC, NULL, 0x0,
 889                         NULL, HFILL }
 890                 },
 891                 { &hf_gsm_bsslap_cause,
 892                         {"Cause", "gsm_bsslap.cause",
 893                         FT_UINT8, BASE_DEC, VALS(gsm_bsslap_cause_vals), 0x0,
 894                         NULL, HFILL }
 895                 },
 896                 { &hf_gsm_bsslap_rrlp_flg,
 897                         {"RRLP Flag", "gsm_bsslap.rrlp_flg",
 898                         FT_BOOLEAN, 8, TFS(&gsm_bsslap_rrlp_flg_vals), 0x01,
 899                         "Cause", HFILL }
 900                 },
 901                 { &hf_gsm_bsslap_tfi,
 902                         {"TFI", "gsm_bsslap.tfi",
 903                         FT_UINT8, BASE_DEC, NULL, 0x1f,
 904                         NULL, HFILL }
 905                 },
 906                 { &hf_gsm_bsslap_poll_rep,
 907                         {"Number of polling repetitions", "gsm_bsslap.poll_rep",
 908                         FT_UINT8, BASE_DEC, NULL, 0x3F,
 909                         NULL, HFILL }
 910                 },
 911                 { &hf_gsm_bsslap_lac,
 912                         {"Location Area Code", "gsm_bsslap.lac",
 913                         FT_UINT8, BASE_DEC, NULL, 0x3f,
 914                         NULL, HFILL }
 915                 },
 916                 { &hf_gsm_bsslap_cell_id_disc,
 917                         {"Cell identification Discriminator", "gsm_bsslap.cell_id_disc",
 918                         FT_UINT8, BASE_DEC, VALS(gsm_a_bsslap_cell_id_disc_vals), 0xf,
 919                         NULL, HFILL }
 920                 },
 921         };
 922
 923         /* Setup protocol subtree array */
 924 #define NUM_INDIVIDUAL_ELEMS    2
 925         gint *ett[NUM_INDIVIDUAL_ELEMS + NUM_GSM_BSSLAP_MSG +
 926                   NUM_GSM_BSSLAP_ELEM];
 927
 928         ett[0] = &ett_gsm_bsslap;
 929         ett[1] = &ett_bsslap_cell_list;
 930
 931         last_offset = NUM_INDIVIDUAL_ELEMS;
 932
 933         for (i=0; i < NUM_GSM_BSSLAP_MSG; i++, last_offset++)
 934         {
 935                 ett_gsm_bsslap_msg[i] = -1;
 936                 ett[last_offset] = &ett_gsm_bsslap_msg[i];
 937         }
 938
 939         for (i=0; i < NUM_GSM_BSSLAP_ELEM; i++, last_offset++)
 940         {
 941                 ett_gsm_bsslap_elem[i] = -1;
 942                 ett[last_offset] = &ett_gsm_bsslap_elem[i];
 943         }
 944
 945
 946 /* Register the protocol name and description */
 947         proto_gsm_bsslap =
 948                 proto_register_protocol("BSS LCS Assistance Protocol",
 949                 "BSSLAP", "bsslap");
 950
 951 /* Required function calls to register the header fields and subtrees used */
 952         proto_register_field_array(proto_gsm_bsslap, hf, array_length(hf));
 953         proto_register_subtree_array(ett, array_length(ett));
 954
 955         register_dissector("gsm_bsslap", dissect_gsm_bsslap, proto_gsm_bsslap);
 956 }