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/* packet-gsm_abis_tfp.c
* Routines for packet dissection of Ericsson GSM A-bis TFP
* (Traffic Forwarding Protocol)
* Copyright 2010-2016 by Harald Welte <laforge@gnumonks.org>
*
* 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 <gerald@wireshark.org>
* 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 <epan/packet.h>
#include <epan/prefs.h>
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:
*/
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