/* packet-gsm_abis_tfp.c * Routines for packet dissection of Ericsson GSM A-bis TFP * (Traffic Forwarding Protocol) * Copyright 2010-2016 by Harald Welte * * TFP is an Ericsson-specific packetized version of replacing TRAU * frames on 8k/16k E1 sub-slots with a paketized frame format which * can be transported over LAPD on a SuperChannel (E1 timeslot bundle) * or L2TP. * * 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 void proto_register_abis_tfp(void); void proto_reg_handoff_abis_tfp(void); enum { SUB_DATA, SUB_MAX }; static dissector_handle_t sub_handles[SUB_MAX]; /* initialize the protocol and registered fields */ static int proto_abis_tfp = -1; /* TFP header */ static int hf_tfp_hdr_atsr = -1; static int hf_tfp_hdr_slot_rate = -1; static int hf_tfp_hdr_seq_nr = -1; static int hf_tfp_hdr_delay_info = -1; static int hf_tfp_hdr_p = -1; static int hf_tfp_hdr_s = -1; static int hf_tfp_hdr_m = -1; static int hf_tfp_hdr_frame_type = -1; static int hf_tfp_amr_rate = -1; /* initialize the subtree pointers */ static int ett_tfp = -1; static const value_string tfp_slot_rate_vals[] = { { 0, "Full Rate (16kbps)" }, { 1, "Sub-Channel 0 (8kbps)" }, { 2, "Sub-Channel 1 (8kbps)" }, { 3, "Reserved" }, { 0, NULL } }; #define TFP_PACKED_NONE 0 #define TFP_PACKED_SCHEME_1 1 static const value_string tfp_packed_vals[] = { { 0, "Not Packed" }, { 1, "Packing Scheme 1" }, { 0, NULL } }; static const value_string tfp_frame_type_vals[] = { /* 8k */ { 0, "TFP-AMR-IND" }, { 1, "TFP-SCCE-AMR-IND" }, { 2, "TFP-HR-IND" }, /* 16k */ { 0x80, "TFP-AMR-IND" }, { 0x81, "TFP-SCCE-AMR-IND" }, { 0x82, "TFP-FR-IND" }, { 0x83, "TFP-EFR-IND" }, { 0x84, "TFP-SCCE-EFR-IND" }, { 0, NULL } }; static const value_string tfp_amr_len_rate_vals[] = { { 1, "SID_FIRST, ONSET, No speech/data" }, { 5, "SID_UPDATE, SID_BAD" }, { 12, "4.75k" }, { 13, "5.15k" }, { 15, "5.90k" }, { 17, "6.70k" }, { 19, "7.40k" }, { 20, "7.95k" }, { 26, "10.2k" }, { 31, "12.2k" }, { 0, NULL } }; static int dissect_abis_tfp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) { proto_item *ti; proto_tree *tfp_tree; int offset = 0; guint32 slot_rate, frame_bits, atsr, seq_nr; guint8 ftype; tvbuff_t *next_tvb; gint len_remain; col_set_str(pinfo->cinfo, COL_PROTOCOL, "TFP"); ti = proto_tree_add_item(tree, proto_abis_tfp, tvb, 0, -1, ENC_NA); tfp_tree = proto_item_add_subtree(ti, ett_tfp); proto_tree_add_item_ret_uint(tfp_tree, hf_tfp_hdr_atsr, tvb, offset, 2, ENC_BIG_ENDIAN, &atsr); proto_tree_add_item_ret_uint(tfp_tree, hf_tfp_hdr_slot_rate, tvb, offset, 2, ENC_BIG_ENDIAN, &slot_rate); proto_tree_add_item_ret_uint(tfp_tree, hf_tfp_hdr_seq_nr, tvb, offset, 2, ENC_BIG_ENDIAN, &seq_nr); proto_tree_add_item(tfp_tree, hf_tfp_hdr_delay_info, tvb, offset+1, 2, ENC_BIG_ENDIAN); proto_tree_add_item(tfp_tree, hf_tfp_hdr_p, tvb, offset+1, 2, ENC_BIG_ENDIAN); proto_tree_add_item(tfp_tree, hf_tfp_hdr_s, tvb, offset+2, 1, ENC_NA); proto_tree_add_item(tfp_tree, hf_tfp_hdr_m, tvb, offset+2, 1, ENC_NA); /* Frame Type depends on Slot Rate */ ftype = tvb_get_guint8(tvb, offset+2) & 0x1E; if (slot_rate == 0) ftype |= 0x80; proto_tree_add_uint_format_value(tfp_tree, hf_tfp_hdr_frame_type, tvb, offset+2, 1, ftype, "%s", val_to_str(ftype, tfp_frame_type_vals, "Unknown (%u)")); offset += 2; col_append_fstr(pinfo->cinfo, COL_INFO, "TS=%u, Seq=%u, %s, %s ", atsr, seq_nr, val_to_str(slot_rate, tfp_slot_rate_vals, "Unknown (%u)"), val_to_str(ftype, tfp_frame_type_vals, "Unknown (%u)")); /* check for Tail bit == 1, iterate over further octests */ while ((tvb_get_guint8(tvb, offset) & 0x01) == 0) offset++; offset++; switch (ftype & 0x7F) { case 0: /* TFP-AMR.ind */ len_remain = tvb_captured_length_remaining(tvb, offset); proto_tree_add_uint(tfp_tree, hf_tfp_amr_rate, tvb, offset, 0, len_remain); break; case 1: /* TFP-SCCE-AMR.ind */ break; case 2: /* TFP-HR.ind */ break; case 3: /* TFP-EFR.ind */ break; case 4: /* TFP-SCCE-EFR.ind */ break; } /* FIXME: implement packed frame support */ if (slot_rate == 0) frame_bits = 320; else frame_bits = 160; next_tvb = tvb_new_subset_length(tvb, offset, frame_bits/8); call_dissector(sub_handles[SUB_DATA], next_tvb, pinfo, tree); return offset; } void proto_register_abis_tfp(void) { static hf_register_info hf[] = { { &hf_tfp_hdr_atsr, { "Air Timeslot Resource", "gsm_abis_tfp.atsr", FT_UINT16, BASE_DEC, NULL, 0xe000, NULL, HFILL } }, { &hf_tfp_hdr_slot_rate, { "Slot Rate", "gsm_abis_tfp.slot_rate", FT_UINT16, BASE_DEC, VALS(tfp_slot_rate_vals), 0x1800, NULL, HFILL } }, { &hf_tfp_hdr_seq_nr, { "Sequence Number", "gsm_abis_tfp.seq_nr", FT_UINT16, BASE_DEC, NULL, 0x07c0, NULL, HFILL } }, { &hf_tfp_hdr_delay_info, { "Delay Information (ms)", "gsm_abis_tfp.delay_info", FT_UINT16, BASE_DEC, NULL, 0x003e, NULL, HFILL } }, { &hf_tfp_hdr_p, { "Packing Scheme", "gsm_abis_tfp.packing_scheme", FT_UINT16, BASE_DEC, VALS(tfp_packed_vals), 0x0180, NULL, HFILL } }, { &hf_tfp_hdr_s, { "Silence Indicator", "gsm_abis_tfp.silence_ind", FT_BOOLEAN, 8, NULL, 0x40, NULL, HFILL } }, { &hf_tfp_hdr_m, { "Marker bit", "gsm_abis_tfp.marker", FT_BOOLEAN, 8, NULL, 0x20, NULL, HFILL } }, { &hf_tfp_hdr_frame_type, { "Frame Type", "gsm_abis_tfp.frame_type", FT_UINT8, BASE_DEC, VALS(tfp_frame_type_vals), 0x1e, NULL, HFILL } }, { &hf_tfp_amr_rate, { "AMR Rate", "gsm_abis_tfp.amr.rate", FT_UINT8, BASE_DEC, VALS(tfp_amr_len_rate_vals), 0, NULL, HFILL } }, }; static gint *ett[] = { &ett_tfp, }; /* assign our custom match functions */ proto_abis_tfp = proto_register_protocol("GSM A-bis TFP", "Ericsson GSM A-bis TFP", "gsm_abis_tfp"); proto_register_field_array(proto_abis_tfp, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); register_dissector("gsm_abis_tfp", dissect_abis_tfp, proto_abis_tfp); } /* This function is called once at startup and every time the user hits * 'apply' in the preferences dialogue */ void proto_reg_handoff_abis_tfp(void) { sub_handles[SUB_DATA] = find_dissector("data"); } /* * Editor modelines - http://www.wireshark.org/tools/modelines.html * * Local variables: * c-basic-offset: 8 * tab-width: 8 * indent-tabs-mode: t * End: * * vi: set shiftwidth=8 tabstop=8 noexpandtab: * :indentSize=8:tabSize=8:noTabs=false: */