1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
|
/* 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
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#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 tfp_handle;
static dissector_handle_t sub_handles[SUB_MAX];
/* initialize the protocol and registered fields */
static int proto_abis_tfp;
/* TFP header */
static int hf_tfp_hdr_atsr;
static int hf_tfp_hdr_slot_rate;
static int hf_tfp_hdr_seq_nr;
static int hf_tfp_hdr_delay_info;
static int hf_tfp_hdr_p;
static int hf_tfp_hdr_s;
static int hf_tfp_hdr_m;
static int hf_tfp_hdr_frame_type;
static int hf_tfp_amr_rate;
/* initialize the subtree pointers */
static int ett_tfp;
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;
uint32_t slot_rate, frame_bits, atsr, seq_nr;
uint8_t ftype;
tvbuff_t *next_tvb;
int 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_uint8(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_uint8(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 int *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));
tfp_handle = 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)
{
/* Those two SAPI values 10/11 are non-standard values, not specified by
* ETSI/3GPP, just like this very same protocol. */
dissector_add_uint("lapd.gsm.sapi", 10, tfp_handle);
dissector_add_uint("lapd.gsm.sapi", 11, tfp_handle);
sub_handles[SUB_DATA] = find_dissector("data");
}
/*
* Editor modelines - https://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:
*/
|
