250 lines
6.9 KiB
C
250 lines
6.9 KiB
C
/* packet-gsm_abis_tfp.c
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* Routines for packet dissection of Ericsson GSM A-bis TFP
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* (Traffic Forwarding Protocol)
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* Copyright 2010-2016 by Harald Welte <laforge@gnumonks.org>
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*
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* TFP is an Ericsson-specific packetized version of replacing TRAU
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* frames on 8k/16k E1 sub-slots with a paketized frame format which
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* can be transported over LAPD on a SuperChannel (E1 timeslot bundle)
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* or L2TP.
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/prefs.h>
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void proto_register_abis_tfp(void);
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void proto_reg_handoff_abis_tfp(void);
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enum {
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SUB_DATA,
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SUB_MAX
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};
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static dissector_handle_t tfp_handle;
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static dissector_handle_t sub_handles[SUB_MAX];
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/* initialize the protocol and registered fields */
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static int proto_abis_tfp = -1;
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/* TFP header */
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static int hf_tfp_hdr_atsr = -1;
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static int hf_tfp_hdr_slot_rate = -1;
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static int hf_tfp_hdr_seq_nr = -1;
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static int hf_tfp_hdr_delay_info = -1;
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static int hf_tfp_hdr_p = -1;
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static int hf_tfp_hdr_s = -1;
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static int hf_tfp_hdr_m = -1;
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static int hf_tfp_hdr_frame_type = -1;
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static int hf_tfp_amr_rate = -1;
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/* initialize the subtree pointers */
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static int ett_tfp = -1;
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static const value_string tfp_slot_rate_vals[] = {
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{ 0, "Full Rate (16kbps)" },
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{ 1, "Sub-Channel 0 (8kbps)" },
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{ 2, "Sub-Channel 1 (8kbps)" },
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{ 3, "Reserved" },
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{ 0, NULL }
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};
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#define TFP_PACKED_NONE 0
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#define TFP_PACKED_SCHEME_1 1
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static const value_string tfp_packed_vals[] = {
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{ 0, "Not Packed" },
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{ 1, "Packing Scheme 1" },
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{ 0, NULL }
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};
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static const value_string tfp_frame_type_vals[] = {
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/* 8k */
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{ 0, "TFP-AMR-IND" },
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{ 1, "TFP-SCCE-AMR-IND" },
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{ 2, "TFP-HR-IND" },
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/* 16k */
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{ 0x80, "TFP-AMR-IND" },
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{ 0x81, "TFP-SCCE-AMR-IND" },
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{ 0x82, "TFP-FR-IND" },
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{ 0x83, "TFP-EFR-IND" },
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{ 0x84, "TFP-SCCE-EFR-IND" },
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{ 0, NULL }
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};
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static const value_string tfp_amr_len_rate_vals[] = {
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{ 1, "SID_FIRST, ONSET, No speech/data" },
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{ 5, "SID_UPDATE, SID_BAD" },
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{ 12, "4.75k" },
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{ 13, "5.15k" },
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{ 15, "5.90k" },
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{ 17, "6.70k" },
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{ 19, "7.40k" },
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{ 20, "7.95k" },
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{ 26, "10.2k" },
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{ 31, "12.2k" },
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{ 0, NULL }
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};
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static int
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dissect_abis_tfp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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proto_item *ti;
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proto_tree *tfp_tree;
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int offset = 0;
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guint32 slot_rate, frame_bits, atsr, seq_nr;
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guint8 ftype;
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tvbuff_t *next_tvb;
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gint len_remain;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "TFP");
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ti = proto_tree_add_item(tree, proto_abis_tfp, tvb, 0, -1, ENC_NA);
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tfp_tree = proto_item_add_subtree(ti, ett_tfp);
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proto_tree_add_item_ret_uint(tfp_tree, hf_tfp_hdr_atsr, tvb, offset, 2, ENC_BIG_ENDIAN, &atsr);
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proto_tree_add_item_ret_uint(tfp_tree, hf_tfp_hdr_slot_rate, tvb, offset, 2, ENC_BIG_ENDIAN, &slot_rate);
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proto_tree_add_item_ret_uint(tfp_tree, hf_tfp_hdr_seq_nr, tvb, offset, 2, ENC_BIG_ENDIAN, &seq_nr);
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proto_tree_add_item(tfp_tree, hf_tfp_hdr_delay_info, tvb, offset+1, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(tfp_tree, hf_tfp_hdr_p, tvb, offset+1, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(tfp_tree, hf_tfp_hdr_s, tvb, offset+2, 1, ENC_NA);
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proto_tree_add_item(tfp_tree, hf_tfp_hdr_m, tvb, offset+2, 1, ENC_NA);
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/* Frame Type depends on Slot Rate */
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ftype = tvb_get_guint8(tvb, offset+2) & 0x1E;
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if (slot_rate == 0)
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ftype |= 0x80;
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proto_tree_add_uint_format_value(tfp_tree, hf_tfp_hdr_frame_type, tvb, offset+2, 1, ftype, "%s",
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val_to_str(ftype, tfp_frame_type_vals, "Unknown (%u)"));
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offset += 2;
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col_append_fstr(pinfo->cinfo, COL_INFO, "TS=%u, Seq=%u, %s, %s ", atsr, seq_nr,
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val_to_str(slot_rate, tfp_slot_rate_vals, "Unknown (%u)"),
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val_to_str(ftype, tfp_frame_type_vals, "Unknown (%u)"));
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/* check for Tail bit == 1, iterate over further octests */
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while ((tvb_get_guint8(tvb, offset) & 0x01) == 0)
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offset++;
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offset++;
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switch (ftype & 0x7F) {
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case 0: /* TFP-AMR.ind */
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len_remain = tvb_captured_length_remaining(tvb, offset);
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proto_tree_add_uint(tfp_tree, hf_tfp_amr_rate, tvb, offset, 0, len_remain);
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break;
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case 1: /* TFP-SCCE-AMR.ind */
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break;
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case 2: /* TFP-HR.ind */
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break;
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case 3: /* TFP-EFR.ind */
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break;
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case 4: /* TFP-SCCE-EFR.ind */
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break;
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}
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/* FIXME: implement packed frame support */
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if (slot_rate == 0)
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frame_bits = 320;
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else
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frame_bits = 160;
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next_tvb = tvb_new_subset_length(tvb, offset, frame_bits/8);
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call_dissector(sub_handles[SUB_DATA], next_tvb, pinfo, tree);
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return offset;
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}
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void
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proto_register_abis_tfp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_tfp_hdr_atsr,
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{ "Air Timeslot Resource", "gsm_abis_tfp.atsr",
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FT_UINT16, BASE_DEC, NULL, 0xe000,
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NULL, HFILL }
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},
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{ &hf_tfp_hdr_slot_rate,
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{ "Slot Rate", "gsm_abis_tfp.slot_rate",
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FT_UINT16, BASE_DEC, VALS(tfp_slot_rate_vals), 0x1800,
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NULL, HFILL }
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},
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{ &hf_tfp_hdr_seq_nr,
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{ "Sequence Number", "gsm_abis_tfp.seq_nr",
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FT_UINT16, BASE_DEC, NULL, 0x07c0,
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NULL, HFILL }
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},
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{ &hf_tfp_hdr_delay_info,
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{ "Delay Information (ms)", "gsm_abis_tfp.delay_info",
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FT_UINT16, BASE_DEC, NULL, 0x003e,
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NULL, HFILL }
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},
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{ &hf_tfp_hdr_p,
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{ "Packing Scheme", "gsm_abis_tfp.packing_scheme",
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FT_UINT16, BASE_DEC, VALS(tfp_packed_vals), 0x0180,
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NULL, HFILL }
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},
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{ &hf_tfp_hdr_s,
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{ "Silence Indicator", "gsm_abis_tfp.silence_ind",
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FT_BOOLEAN, 8, NULL, 0x40,
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NULL, HFILL }
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},
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{ &hf_tfp_hdr_m,
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{ "Marker bit", "gsm_abis_tfp.marker",
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FT_BOOLEAN, 8, NULL, 0x20,
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NULL, HFILL }
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},
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{ &hf_tfp_hdr_frame_type,
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{ "Frame Type", "gsm_abis_tfp.frame_type",
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FT_UINT8, BASE_DEC, VALS(tfp_frame_type_vals), 0x1e,
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NULL, HFILL }
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},
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{ &hf_tfp_amr_rate,
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{ "AMR Rate", "gsm_abis_tfp.amr.rate",
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FT_UINT8, BASE_DEC, VALS(tfp_amr_len_rate_vals), 0,
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NULL, HFILL }
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},
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};
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static gint *ett[] = {
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&ett_tfp,
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};
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/* assign our custom match functions */
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proto_abis_tfp = proto_register_protocol("GSM A-bis TFP", "Ericsson GSM A-bis TFP",
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"gsm_abis_tfp");
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proto_register_field_array(proto_abis_tfp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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tfp_handle = register_dissector("gsm_abis_tfp", dissect_abis_tfp, proto_abis_tfp);
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}
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/* This function is called once at startup and every time the user hits
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* 'apply' in the preferences dialogue */
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void
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proto_reg_handoff_abis_tfp(void)
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{
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/* Those two SAPI values 10/11 are non-standard values, not specified by
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* ETSI/3GPP, just like this very same protocol. */
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dissector_add_uint("lapd.gsm.sapi", 10, tfp_handle);
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dissector_add_uint("lapd.gsm.sapi", 11, tfp_handle);
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sub_handles[SUB_DATA] = find_dissector("data");
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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