/* packet-gmr1_rach.c * * Routines for GMR-1 RACH dissection in wireshark. * Copyright (c) 2012 Sylvain Munaut * * References: * [1] ETSI TS 101 376-4-8 V1.3.1 - GMR-1 04.008 * [2] ETSI TS 101 376-4-8 V2.2.1 - GMPRS-1 04.008 * [3] ETSI TS 101 376-4-8 V3.1.1 - GMR-1 3G 44.008 * * Especially [1] 10.1.8 * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "config.h" #include #include #include #include "packet-csn1.h" void proto_register_gmr1_rach(void); void proto_reg_handoff_gmr1_rach(void); /* GMR-1 RACH proto */ static int proto_gmr1_rach = -1; /* GMR-1 RACH subtrees */ static gint ett_rach_msg = -1; static gint ett_rach_kls1 = -1; static gint ett_rach_kls2 = -1; static gint ett_rach_est_cause = -1; static gint ett_rach_dialed_num = -1; static gint ett_rach_gps_pos = -1; /* Handoffs */ static dissector_handle_t data_handle; /* Fields */ static int hf_rach_prio = -1; static int hf_rach_est_cause = -1; static int hf_rach_est_cause_moc = -1; static int hf_rach_est_cause_pag_resp = -1; static int hf_rach_num_plan = -1; static int hf_rach_chan_needed = -1; static int hf_rach_retry_cnt = -1; static int hf_rach_precorr = -1; static int hf_rach_rand_ref = -1; static int hf_rach_gps_pos_cpi = -1; static int hf_rach_gps_pos_lat = -1; static int hf_rach_gps_pos_long = -1; static int hf_rach_mes_pwr_class = -1; static int hf_rach_sp_hplmn_id = -1; static int hf_rach_pd = -1; static int hf_rach_number = -1; static int hf_rach_number_grp1 = -1; static int hf_rach_number_grp2 = -1; static int hf_rach_number_grp3 = -1; static int hf_rach_number_grp4 = -1; static int hf_rach_number_grp5 = -1; static int hf_rach_msc_id = -1; static int hf_rach_gps_timestamp = -1; static int hf_rach_software_version = -1; static int hf_rach_spare = -1; static int hf_rach_gci = -1; static int hf_rach_r = -1; static int hf_rach_o = -1; static int hf_rach_number_type = -1; static const value_string rach_prio_vals[] = { { 0, "Normal Call" }, { 1, "Priority Call" }, { 0, NULL } }; static const value_string rach_est_cause_vals[] = { { 4, "In response to alerting" }, { 8, "Location update" }, { 9, "IMSI Detach" }, { 10, "Supplementary Services" }, { 11, "Short Message Services" }, { 12, "Position Verification" }, { 15, "Emergency Call" }, { 0, NULL } }; static const value_string rach_est_cause_moc_vals[] = { { 1, "Mobile Originated Call" }, { 0, NULL } }; static const value_string rach_est_cause_pag_resp_vals[] = { { 0, "In response to paging" }, { 0, NULL } }; static const value_string rach_num_plan_vals[] = { { 0, "Unknown" }, { 1, "ISDN E.164/E.163" }, { 2, "Not Used" }, { 3, "X.121" }, { 4, "Telex F.69" }, { 8, "National Numbering Plan" }, { 9, "Private Numbering Plan" }, { 15, "Reserved for Extension" }, { 0, NULL } }; static const value_string rach_chan_needed_vals[] = { { 0, "any" }, { 1, "SDCCH" }, { 2, "TCH3" }, { 3, "spare" }, { 0, NULL } }; static const value_string rach_precorr_vals[] = { { 0, "Reserved" }, { 1, "-47 symbols correction" }, { 2, "-94 symbols correction" }, { 3, "-141 symbols correction" }, { 4, "+141 symbols correction" }, { 5, "+94 symbols correction" }, { 6, "+47 symbols correction" }, { 7, "No precorrection" }, { 0, NULL } }; static void dissect_gmr1_rach_kls1(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree, int *is_moc) { proto_item *ec_item = NULL; proto_tree *ec_tree = NULL; guint8 ec; /* Priority */ proto_tree_add_item(tree, hf_rach_prio, tvb, offset, 1, ENC_BIG_ENDIAN); /* Establishment Cause */ ec = (tvb_get_guint8(tvb, offset) >> 1) & 0x1f; *is_moc = !!(ec & 0x10); if (ec & 0x10) { /* MOC */ ec_item = proto_tree_add_item(tree, hf_rach_est_cause_moc, tvb, offset, 1, ENC_BIG_ENDIAN); ec_tree = proto_item_add_subtree(ec_item, ett_rach_est_cause); col_append_str(pinfo->cinfo, COL_INFO, "Mobile Originated Call "); /* Numbering plan */ proto_tree_add_item(ec_tree, hf_rach_num_plan, tvb, offset, 1, ENC_BIG_ENDIAN); } else if ((ec & 0x1c) == 0x00) { /* Paging response */ ec_item = proto_tree_add_item(tree, hf_rach_est_cause_pag_resp, tvb, offset, 1, ENC_BIG_ENDIAN); ec_tree = proto_item_add_subtree(ec_item, ett_rach_est_cause); col_append_str(pinfo->cinfo, COL_INFO, "Paging response "); /* Channel Needed */ proto_tree_add_item(ec_tree, hf_rach_chan_needed, tvb, offset, 1, ENC_BIG_ENDIAN); } else { proto_tree_add_item(tree, hf_rach_est_cause, tvb, offset, 1, ENC_BIG_ENDIAN); col_append_fstr(pinfo->cinfo, COL_INFO, "%s", val_to_str(ec, rach_est_cause_vals, "Unknown (%u)")); } /* Retry counter */ proto_tree_add_item(tree, hf_rach_retry_cnt, tvb, offset, 1, ENC_BIG_ENDIAN); /* Precorrection Indication */ proto_tree_add_item(tree, hf_rach_precorr, tvb, offset + 1, 1, ENC_BIG_ENDIAN); /* Random Reference */ proto_tree_add_item(tree, hf_rach_rand_ref, tvb, offset + 1, 1, ENC_BIG_ENDIAN); } static const value_string rach_gps_pos_cpi_vals[] = { { 0, "GPS position is old position" }, { 1, "GPS position is current position" }, { 0, NULL } }; static void rach_gps_pos_lat_fmt(gchar *s, guint32 v) { gint32 sv; if (v & (1<<18)) v |= 0xfff80000; sv = v; g_snprintf(s, ITEM_LABEL_LENGTH, "%.5f %s (%d)", abs(sv) / 2912.7f, sv < 0 ? "S" : "N", sv); } static void rach_gps_pos_long_fmt(gchar *s, guint32 v) { gint32 sv; if (v & (1<<19)) v |= 0xfff00000; sv = v; g_snprintf(s, ITEM_LABEL_LENGTH, "%.5f %s (%d)", abs(sv) / 2912.70555f, sv < 0 ? "W" : "E", sv); /* FIXME: The specs says >0 is West ... but it doesn't seem to * match real world captures ! */ } static void dissect_gmr1_rach_gps_pos(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree) { guint32 lat; /* Check for NULL */ lat = (tvb_get_ntohl(tvb, offset) >> 4) & 0x7ffff; if (lat == 0x40000) { proto_tree_add_text(tree, tvb, offset, 5, "NULL GPS Position"); return; } /* CPI */ proto_tree_add_item(tree, hf_rach_gps_pos_cpi, tvb, offset, 1, ENC_BIG_ENDIAN); /* Latitude */ proto_tree_add_item(tree, hf_rach_gps_pos_lat, tvb, offset, 3, ENC_BIG_ENDIAN); /* Longitude */ proto_tree_add_item(tree, hf_rach_gps_pos_long, tvb, offset + 2, 3, ENC_BIG_ENDIAN); } static void rach_sp_hplmn_id_fmt(gchar *s, guint32 v) { if (v == 0xfffff) { g_snprintf(s, ITEM_LABEL_LENGTH, "%05x (Null)", v); } else if ((v & 0xf8000) == 0xf8000) { g_snprintf(s, ITEM_LABEL_LENGTH, "%05x (SP ID %4d)", v, v & 0x7fff); } else { g_snprintf(s, ITEM_LABEL_LENGTH, "%05x (HPLMN ID)", v); } } static const value_string rach_pd_vals[] = { { 0, "Fixed to 00 for this version of the protocol" }, { 1, "Reserved" }, { 2, "Reserved" }, { 3, "Reserved" }, { 0, NULL } }; static void rach_dialed_num_grp1234_fmt(gchar *s, guint32 v) { g_snprintf(s, ITEM_LABEL_LENGTH, "%03d", v); } static void rach_dialed_num_grp5_fmt(gchar *s, guint32 v) { if (v <= 999) { g_snprintf(s, ITEM_LABEL_LENGTH, "%03d", v); } else if (v == 1023) { g_snprintf(s, ITEM_LABEL_LENGTH, "All digits in the preceding group are valid (%d)", v); } else if (v == 1022) { g_snprintf(s, ITEM_LABEL_LENGTH, "First two digits in the preceding group are valid, " "and the third digit (i.e. 0) is padding(%d)", v); } else if (v == 1021) { g_snprintf(s, ITEM_LABEL_LENGTH, "First digit in the preceding group is valid, and " "the second and third 0s are padding(%d)", v); } else if (v >= 1100 && v <= 1199) { g_snprintf(s, ITEM_LABEL_LENGTH, "%02d (%d)", v - 1100, v); } else if (v >= 1200 && v <= 1209) { g_snprintf(s, ITEM_LABEL_LENGTH, "%01d (%d)", v - 1200, v); } else { g_snprintf(s, ITEM_LABEL_LENGTH, "Invalid (%d)", v); } } static void rach_gps_timestamp_fmt(gchar *s, guint32 v) { if (v == 0xffff) { g_snprintf(s, ITEM_LABEL_LENGTH, ">= 65535 minutes or N/A (%04x)", v); } else { g_snprintf(s, ITEM_LABEL_LENGTH, "%d minutes (%04x)", v, v); } } static const value_string rach_gci_vals[] = { { 0, "MES is not GPS capable" }, { 1, "MES is GPS capable" }, { 0, NULL } }; static const value_string rach_number_type_vals[] = { { 0, "Unknown" }, { 1, "International Number" }, { 2, "National Number" }, { 3, "Network-specific Number (operator access)" }, { 4, "Dedicated Access short code" }, { 5, "Reserved" }, { 6, "Reserved" }, { 7, "(N/A - Not MO Call)" }, { 0, NULL } }; static int _parse_dialed_number(gchar *s, int slen, tvbuff_t *tvb, int offset) { guint16 grp[5]; int rv; grp[0] = ((tvb_get_guint8(tvb, offset+0) & 0x3f) << 4) | ((tvb_get_guint8(tvb, offset+1) & 0xf0) >> 4); grp[1] = ((tvb_get_guint8(tvb, offset+1) & 0x0f) << 6) | ((tvb_get_guint8(tvb, offset+2) & 0xfc) >> 2); grp[2] = ((tvb_get_guint8(tvb, offset+2) & 0x03) << 8) | tvb_get_guint8(tvb, offset+3); grp[3] = ((tvb_get_guint8(tvb, offset+4) & 0xff) << 2) | ((tvb_get_guint8(tvb, offset+5) & 0xc0) >> 6); grp[4] = ((tvb_get_guint8(tvb, offset+5) & 0x3f) << 5) | ((tvb_get_guint8(tvb, offset+6) & 0xf8) >> 3); rv = g_snprintf(s, slen, "%03d%03d%03d", grp[0], grp[1], grp[2]); if (grp[4] <= 999) { rv += g_snprintf(s + rv, ITEM_LABEL_LENGTH, "%03d%03d", grp[3], grp[4]); } else if (grp[4] == 1023) { rv += g_snprintf(s + rv, ITEM_LABEL_LENGTH, "%03d", grp[3]); } else if (grp[4] == 1022) { rv += g_snprintf(s + rv, ITEM_LABEL_LENGTH, "%02d", grp[3] / 10); } else if (grp[4] == 1021) { rv += g_snprintf(s + rv, ITEM_LABEL_LENGTH, "%01d", grp[3] / 100); } else if (grp[4] >= 1100 && grp[4] <= 1199) { rv += g_snprintf(s + rv, ITEM_LABEL_LENGTH, "%03d%02d", grp[3], grp[4] - 1100); } else if (grp[4] >= 1200 && grp[4] <= 1209) { rv += g_snprintf(s + rv, ITEM_LABEL_LENGTH, "%03d%01d", grp[3], grp[4] - 1200); } else { rv += g_snprintf(s + rv, ITEM_LABEL_LENGTH, "%03d%03d (Invalid)", grp[3], grp[4]); } return rv; } static void dissect_gmr1_rach_kls2(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree, int is_moc) { proto_item *dialed_num_item = NULL, *gps_pos_item = NULL; proto_tree *dialed_num_tree = NULL, *gps_pos_tree = NULL; /* MES Power Class */ proto_tree_add_item(tree, hf_rach_mes_pwr_class, tvb, offset, 1, ENC_BIG_ENDIAN); /* SP/HPLMN ID */ proto_tree_add_item(tree, hf_rach_sp_hplmn_id, tvb, offset, 3, ENC_BIG_ENDIAN); /* PD */ proto_tree_add_item(tree, hf_rach_pd, tvb, offset + 3, 1, ENC_BIG_ENDIAN); /* Is it a MO call ? */ if (is_moc) { gchar s[32]; /* Dialed number */ /* Parse number */ _parse_dialed_number(s, sizeof(s), tvb, offset + 3); col_append_fstr(pinfo->cinfo, COL_INFO, "%s ", s); /* Base item */ dialed_num_item = proto_tree_add_string( tree, hf_rach_number, tvb, offset + 3, 7, s); dialed_num_tree = proto_item_add_subtree( dialed_num_item, ett_rach_dialed_num); /* Group 1 */ proto_tree_add_item(dialed_num_tree, hf_rach_number_grp1, tvb, offset + 3, 2, ENC_BIG_ENDIAN); /* Group 2 */ proto_tree_add_item(dialed_num_tree, hf_rach_number_grp2, tvb, offset + 4, 2, ENC_BIG_ENDIAN); /* Group 3 */ proto_tree_add_item(dialed_num_tree, hf_rach_number_grp3, tvb, offset + 5, 2, ENC_BIG_ENDIAN); /* Group 4 */ proto_tree_add_item(dialed_num_tree, hf_rach_number_grp4, tvb, offset + 7, 2, ENC_BIG_ENDIAN); /* Group 5 */ proto_tree_add_item(dialed_num_tree, hf_rach_number_grp5, tvb, offset + 8, 2, ENC_BIG_ENDIAN); } else { /* MSC ID */ proto_tree_add_item(tree, hf_rach_msc_id, tvb, offset + 3, 1, ENC_BIG_ENDIAN); /* GPS timestamp */ proto_tree_add_item(tree, hf_rach_gps_timestamp, tvb, offset + 4, 2, ENC_BIG_ENDIAN); /* Software version number */ proto_tree_add_item(tree, hf_rach_software_version, tvb, offset + 6, 1, ENC_BIG_ENDIAN); /* Spare */ proto_tree_add_item(tree, hf_rach_spare, tvb, offset + 6, 1, ENC_BIG_ENDIAN); } /* GCI */ proto_tree_add_item(tree, hf_rach_gci, tvb, offset + 9, 1, ENC_BIG_ENDIAN); /* R */ proto_tree_add_item(tree, hf_rach_r, tvb, offset + 9, 1, ENC_BIG_ENDIAN); /* O */ proto_tree_add_item(tree, hf_rach_o, tvb, offset + 9, 1, ENC_BIG_ENDIAN); /* GPS Position */ gps_pos_item = proto_tree_add_text( tree, tvb, offset + 10, 5, "GPS Position"); gps_pos_tree = proto_item_add_subtree(gps_pos_item, ett_rach_gps_pos); dissect_gmr1_rach_gps_pos(tvb, offset + 10, pinfo, gps_pos_tree); /* Number type */ proto_tree_add_item(tree, hf_rach_number_type, tvb, offset + 15, 1, ENC_BIG_ENDIAN); } static void dissect_gmr1_rach(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { proto_item *rach_item = NULL, *kls1_item = NULL, *kls2_item = NULL; proto_tree *rach_tree = NULL, *kls1_tree = NULL, *kls2_tree = NULL; int len, is_moc; len = tvb_captured_length(tvb); rach_item = proto_tree_add_protocol_format( tree, proto_gmr1_rach, tvb, 0, len, "GMR-1 Channel Request (RACH)"); rach_tree = proto_item_add_subtree(rach_item, ett_rach_msg); if (len != 18) { col_append_str(pinfo->cinfo, COL_INFO, "(Invalid)"); call_dissector(data_handle, tvb, pinfo, tree); return; } col_append_str(pinfo->cinfo, COL_INFO, "(RACH) "); kls1_item = proto_tree_add_text( rach_tree, tvb, 0, 2, "Class-1 informations"); kls1_tree = proto_item_add_subtree(kls1_item, ett_rach_kls1); dissect_gmr1_rach_kls1(tvb, 0, pinfo, kls1_tree, &is_moc); kls2_item = proto_tree_add_text( rach_tree, tvb, 2, 16, "Class-2 informations"); kls2_tree = proto_item_add_subtree(kls2_item, ett_rach_kls2); dissect_gmr1_rach_kls2(tvb, 2, pinfo, kls2_tree, is_moc); } void proto_register_gmr1_rach(void) { static hf_register_info hf[] = { { &hf_rach_prio, { "Priority", "gmr1.rach.priority", FT_UINT8, BASE_DEC, VALS(rach_prio_vals), 0x01, NULL, HFILL } }, { &hf_rach_est_cause, { "Establishment Cause", "gmr1.rach.est_cause", FT_UINT8, BASE_HEX, VALS(rach_est_cause_vals), 0x3e, NULL, HFILL } }, { &hf_rach_est_cause_moc, { "Establishment Cause", "gmr1.rach.est_cause.moc", FT_UINT8, BASE_HEX, VALS(rach_est_cause_moc_vals), 0x20, NULL, HFILL } }, { &hf_rach_est_cause_pag_resp, { "Establishment Cause", "gmr1.rach.est_cause.pag_resp", FT_UINT8, BASE_HEX, VALS(rach_est_cause_pag_resp_vals), 0x38, NULL, HFILL } }, { &hf_rach_num_plan, { "Numbering Plan Identification", "gmr1.rach.numbering_plan", FT_UINT8, BASE_DEC, VALS(rach_num_plan_vals), 0x1e, NULL, HFILL } }, { &hf_rach_chan_needed, { "Channel Needed", "gmr1.rach.chan_needed", FT_UINT8, BASE_DEC, VALS(rach_chan_needed_vals), 0x06, "Echoed from Paging Request", HFILL } }, { &hf_rach_retry_cnt, { "Retry Counter", "gmr1.rach.retry_counter", FT_UINT8, BASE_DEC, NULL, 0xc0, "Retransmission count for current access attempt", HFILL } }, { &hf_rach_precorr, { "Precorrection Indication", "gmr1.rach.precorr_ind", FT_UINT8, BASE_DEC, VALS(rach_precorr_vals), 0xe0, "This is the timing correction applied to RACH while " "sending this message. See GMR 05.010.", HFILL } }, { &hf_rach_rand_ref, { "Random Reference", "gmr1.rach.random_reference", FT_UINT8, BASE_HEX, NULL, 0x1f, "A random number of 5 bits", HFILL } }, { &hf_rach_gps_pos_cpi, { "CPI", "gmr1.rach.gps_pos.cpi", FT_UINT8, BASE_DEC, VALS(rach_gps_pos_cpi_vals), 0x80, "Current Position Indicator", HFILL } }, { &hf_rach_gps_pos_lat, { "Latitude", "gmr1.rach.gps_pos.latitude", FT_UINT24, BASE_CUSTOM, rach_gps_pos_lat_fmt, 0x7ffff0, NULL, HFILL } }, { &hf_rach_gps_pos_long, { "Longitude", "gmr1.rach.gps_pos.longitude", FT_UINT24, BASE_CUSTOM, rach_gps_pos_long_fmt, 0x0fffff, NULL, HFILL } }, { &hf_rach_mes_pwr_class, { "MES Power Class", "gmr1.rach.mes_power_class", FT_UINT8, BASE_DEC, NULL, 0xf0, "See GMR 05.005 for infos", HFILL } }, { &hf_rach_sp_hplmn_id, { "SP/HPLMN ID", "gmr1.rach.sp_hplmn_id", FT_UINT24, BASE_CUSTOM, rach_sp_hplmn_id_fmt, 0x0fffff, NULL, HFILL } }, { &hf_rach_pd, { "PD", "gmr1.rach.pd", FT_UINT8, BASE_DEC, VALS(rach_pd_vals), 0xc0, "Protocol Discriminator", HFILL } }, { &hf_rach_number, { "Dialed Number", "gmr1.rach.number", FT_STRING, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_rach_number_grp1, { "Group 1", "gmr1.rach.number.grp1", FT_UINT16, BASE_CUSTOM, rach_dialed_num_grp1234_fmt, 0x3ff0, NULL, HFILL } }, { &hf_rach_number_grp2, { "Group 2", "gmr1.rach.number.grp2", FT_UINT16, BASE_CUSTOM, rach_dialed_num_grp1234_fmt, 0x0ffc, NULL, HFILL } }, { &hf_rach_number_grp3, { "Group 3", "gmr1.rach.number.grp3", FT_UINT16, BASE_CUSTOM, rach_dialed_num_grp1234_fmt, 0x03ff, NULL, HFILL } }, { &hf_rach_number_grp4, { "Group 4", "gmr1.rach.number.grp4", FT_UINT16, BASE_CUSTOM, rach_dialed_num_grp1234_fmt, 0xffc0, NULL, HFILL } }, { &hf_rach_number_grp5, { "Group 5", "gmr1.rach.number.grp5", FT_UINT16, BASE_CUSTOM, rach_dialed_num_grp5_fmt, 0x3ff8, NULL, HFILL } }, { &hf_rach_msc_id, { "MSC ID", "gmr1.rach.msc_id", FT_UINT8, BASE_DEC, NULL, 0x3f, NULL, HFILL } }, { &hf_rach_gps_timestamp, { "GPS Timestamp", "gmr1.rach.gps_timestamp", FT_UINT16, BASE_CUSTOM, rach_gps_timestamp_fmt, 0xffff, NULL, HFILL } }, { &hf_rach_software_version, { "Software Version", "gmr1.rach.software_version", FT_UINT8, BASE_DEC, NULL, 0xfe, NULL, HFILL } }, { &hf_rach_spare, { "Spare", "gmr1.rach.spare", FT_UINT32, BASE_DEC, NULL, 0x01fffff8, NULL, HFILL } }, { &hf_rach_gci, { "GCI", "gmr1.rach.gci", FT_UINT8, BASE_DEC, VALS(rach_gci_vals), 0x01, "GPS Capability Indicator", HFILL } }, { &hf_rach_r, { "R", "gmr1.rach.r", FT_UINT8, BASE_DEC, NULL, 0x02, "See GMR 04.008 10.1.8 for full description" , HFILL } }, { &hf_rach_o, { "O", "gmr1.rach.o", FT_UINT8, BASE_DEC, NULL, 0x04, "See GMR 04.008 10.1.8 for full description", HFILL } }, { &hf_rach_number_type, { "Number Type", "gmr1.rach.number_type", FT_UINT8, BASE_DEC, VALS(rach_number_type_vals), 0x07, "For MO Call only", HFILL } }, }; static gint *ett[] = { &ett_rach_msg, &ett_rach_kls1, &ett_rach_kls2, &ett_rach_est_cause, &ett_rach_dialed_num, &ett_rach_gps_pos, }; proto_gmr1_rach = proto_register_protocol("GEO-Mobile Radio (1) RACH", "GMR-1 RACH", "gmr1.rach"); proto_register_field_array(proto_gmr1_rach, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); register_dissector("gmr1_rach", dissect_gmr1_rach, proto_gmr1_rach); } void proto_reg_handoff_gmr1_rach(void) { data_handle = find_dissector("data"); }