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
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
|
/* packet-mpls-y1711.c
* Routines for (old) ITU-T MPLS OAM: it conforms to ITU-T Y.1711 and RFC 3429
*
* Copyright 2006, 2011 _FF_
*
* Francesco Fondelli <francesco dot fondelli, gmail dot com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
* FF: NOTES
*
* - this should dissect OAM pdus (identified by the MPLS_LABEL_OAM_ALERT = 14
* label) as described in ITU-T Y.1711 and RFC 3429.
*
* - this code used to be (since 2006) in packet-mpls.c ... nobody on this
* planet is using Y.1711 today (?), so thanks to the mpls subdissector
* table indexed by label value it has been moved here.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/expert.h>
#include "packet-mpls.h"
void proto_register_mpls_y1711(void);
void proto_reg_handoff_mpls_y1711(void);
static int proto_mpls_y1711;
static int hf_mpls_y1711_function_type;
/* static int hf_mpls_y1711_ttsi; */
static int hf_mpls_y1711_frequency;
static int hf_mpls_y1711_defect_type;
static int hf_mpls_y1711_defect_location;
static int hf_mpls_y1711_bip16;
/* Generated from convert_proto_tree_add_text.pl */
static int hf_mpls_y1711_lsr_id;
static int hf_mpls_y1711_lsp_id;
static int ett_mpls_y1711;
/* Generated from convert_proto_tree_add_text.pl */
static expert_field ei_mpls_y1711_padding_not_ff;
static expert_field ei_mpls_y1711_reserved_not_zero;
static expert_field ei_mpls_y1711_ttsi_not_preset;
static expert_field ei_mpls_y1711_minimum_payload;
static expert_field ei_mpls_y1711_s_bit_not_one;
static expert_field ei_mpls_y1711_no_OAM_alert_label;
static expert_field ei_mpls_y1711_exp_bits_not_zero;
static expert_field ei_mpls_y1711_ttl_not_one;
static expert_field ei_mpls_y1711_padding_not_zero;
static expert_field ei_mpls_y1711_unknown_pdu;
static dissector_handle_t mpls_y1711_handle;
static const value_string y1711_function_type_vals[] = {
{0x00, "Reserved" },
{0x01, "CV (Connectivity Verification)" },
{0x02, "FDI (Forward Defect Indicator)" },
{0x03, "BDI (Backward Defect Indicator)" },
{0x04, "Reserved for Performance packets" },
{0x05, "Reserved for LB-Req (Loopback Request)" },
{0x06, "Reserved for LB-Rsp (Loopback Response)"},
{0x07, "FDD (Fast Failure Detection)" },
{0, NULL }
};
static const value_string y1711_frequency_vals[] = {
{0x00, "Reserved" },
{0x01, "10 ms" },
{0x02, "20 ms" },
{0x03, "50 ms (default value)"},
{0x04, "100 ms" },
{0x05, "200 ms" },
{0x06, "500 ms" },
/* 7-255 Reserved */
{0, NULL }
};
static const value_string y1711_defect_type_vals[] = {
{0x0000, "Reserved" },
{0x0101, "dServer" },
{0x0102, "dPeerME" },
{0x0201, "dLOCV" },
{0x0202, "dTTSI_Mismatch"},
{0x0203, "dTTSI_Mismerge"},
{0x0204, "dExcess" },
{0x02FF, "dUnknown" },
{0xFFFF, "Reserved" },
{0, NULL }
};
static int
dissect_mpls_y1711(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
struct mplsinfo *mplsinfo;
int offset = 0;
proto_tree *mpls_y1711_tree;
int functype;
tvbuff_t *data_tvb;
static const uint8_t allone[] = { 0xff, 0xff };
static const uint8_t allzero[] = { 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00 };
/* Reject the packet if data is NULL */
if (data == NULL)
return 0;
mplsinfo = (struct mplsinfo *)data;
functype = tvb_get_uint8(tvb, offset);
col_append_fstr(pinfo->cinfo, COL_INFO, " (Y.1711: %s)",
(functype == 0x01) ? "CV" :
(functype == 0x02) ? "FDI" :
(functype == 0x03) ? "BDI" :
(functype == 0x07) ? "FDD" :
"reserved/unknown");
/* sanity checks */
if (tvb_reported_length(tvb) < 44) {
/*
* ITU-T Y.1711, 5.3: PDUs must have a minimum payload length of
* 44 bytes
*/
proto_tree_add_expert(tree, pinfo, &ei_mpls_y1711_minimum_payload, tvb, offset, -1);
data_tvb = tvb_new_subset_remaining(tvb, offset);
call_data_dissector(data_tvb, pinfo, tree);
return tvb_reported_length(tvb);
}
mpls_y1711_tree = proto_tree_add_subtree(tree, tvb, offset, 44, ett_mpls_y1711, NULL, "Y.1711 OAM");
/* checks for exp, bos and ttl encoding */
if (mplsinfo->label != MPLS_LABEL_OAM_ALERT)
proto_tree_add_expert_format(mpls_y1711_tree, pinfo, &ei_mpls_y1711_no_OAM_alert_label, tvb, offset - 4, 3,
"Warning: Y.1711 but no OAM alert label (%d) ?!", MPLS_LABEL_OAM_ALERT);
if (mplsinfo->exp != 0)
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_exp_bits_not_zero, tvb, offset - 2, 1);
if (mplsinfo->bos != 1)
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_s_bit_not_one, tvb, offset - 2, 1);
if (mplsinfo->ttl != 1)
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_ttl_not_one, tvb, offset - 1, 1);
/* starting dissection */
functype = tvb_get_uint8(tvb, offset);
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_function_type, tvb,
offset, 1,
ENC_LITTLE_ENDIAN);
offset++;
switch (functype) {
case 0x01: /* CV */
{
/* 3 octets reserved (all 0x00) */
if (tvb_memeql(tvb, offset, allzero, 3) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_reserved_not_zero, tvb, offset, 3);
}
offset += 3;
/* ttsi (ipv4 flavor as in RFC 2373) */
if (tvb_memeql(tvb, offset, allzero, 10) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_padding_not_zero, tvb, offset, 10);
}
offset += 10;
if (tvb_memeql(tvb, offset, allone, 2) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_padding_not_ff, tvb, offset, 2);
}
offset += 2;
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_lsr_id, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_lsp_id, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
/* 18 octets of padding (all 0x00) */
if (tvb_memeql(tvb, offset, allzero, 18) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_padding_not_zero, tvb, offset, 18);
}
offset += 18;
}
break;
case 0x02: /* FDI */
case 0x03: /* BDI */
{
/* 1 octets reserved (all 0x00) */
if (tvb_memeql(tvb, offset, allzero, 1) == -1) {
proto_tree_add_expert_format(mpls_y1711_tree, pinfo, &ei_mpls_y1711_reserved_not_zero, tvb, offset, 3,
"Error: this byte is reserved and must be 0x00");
}
offset++;
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_defect_type, tvb,
offset, 2,
ENC_BIG_ENDIAN);
offset += 2;
/*
* ttsi (ipv4 flavor as in RFC 2373) is optional if not used must
* be set to all 0x00
*/
if (tvb_memeql(tvb, offset, allzero, 20) == 0) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_ttsi_not_preset, tvb, offset, 20);
offset += 20;
} else {
if (tvb_memeql(tvb, offset, allzero, 10) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_padding_not_zero, tvb, offset, 10);
}
offset += 10;
if (tvb_memeql(tvb, offset, allone, 2) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_padding_not_ff, tvb, offset, 2);
}
offset += 2;
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_lsr_id, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_lsp_id, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
}
/* defect location */
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_defect_location, tvb,
offset, 4,
ENC_BIG_ENDIAN);
offset += 4;
/* 14 octets of padding (all 0x00) */
if (tvb_memeql(tvb, offset, allzero, 14) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_padding_not_zero, tvb, offset, 14);
}
offset += 14;
}
break;
case 0x07: /* FDD */
{
/* 3 octets reserved (all 0x00) */
if (tvb_memeql(tvb, offset, allzero, 3) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_reserved_not_zero, tvb, offset, 3);
}
offset += 3;
/* ttsi (ipv4 flavor as in RFC 2373) */
if (tvb_memeql(tvb, offset, allzero, 10) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_padding_not_zero, tvb, offset, 10);
}
offset += 10;
if (tvb_memeql(tvb, offset, allone, 2) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_padding_not_ff, tvb, offset, 2);
}
offset += 2;
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_lsr_id, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_lsp_id, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_frequency, tvb,
offset, 1,
ENC_LITTLE_ENDIAN);
offset++;
/* 17 octets of padding (all 0x00) */
if (tvb_memeql(tvb, offset, allzero, 17) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_padding_not_zero, tvb, offset, 17);
}
offset += 17;
}
break;
default:
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_unknown_pdu, tvb, offset - 1, -1);
return offset;
}
/* BIP16 */
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_bip16, tvb, offset, 2,
ENC_BIG_ENDIAN);
offset += 2;
return offset;
}
void
proto_register_mpls_y1711(void)
{
static hf_register_info hf[] = {
{
&hf_mpls_y1711_function_type,
{
"Function Type", "mpls_y1711.function_type", FT_UINT8,
BASE_HEX, VALS(y1711_function_type_vals),
0x0, "Function Type codepoint", HFILL
}
},
#if 0
{
&hf_mpls_y1711_ttsi,
{
"Trail Termination Source Identifier",
"mpls_y1711.ttsi",
FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL
}
},
#endif
{
&hf_mpls_y1711_frequency,
{
"Frequency", "mpls_y1711.frequency", FT_UINT8,
BASE_HEX, VALS(y1711_frequency_vals), 0x0,
"Frequency of probe injection", HFILL
}
},
{
&hf_mpls_y1711_defect_type,
{
"Defect Type", "mpls_y1711.defect_type", FT_UINT16,
BASE_HEX, VALS(y1711_defect_type_vals), 0x0, NULL, HFILL
}
},
{
&hf_mpls_y1711_defect_location,
{
"Defect Location (AS)", "mpls_y1711.defect_location",
FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL
}
},
{
&hf_mpls_y1711_bip16,
{
"BIP16", "mpls_y1711.bip16", FT_UINT16,
BASE_HEX, NULL, 0x0, NULL, HFILL
}
},
/* Generated from convert_proto_tree_add_text.pl */
{ &hf_mpls_y1711_lsr_id, { "LSR ID", "mpls_y1711.lsr_id", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_mpls_y1711_lsp_id, { "LSP ID", "mpls_y1711.lsp_id", FT_INT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
};
static int *ett[] = {
&ett_mpls_y1711
};
static ei_register_info ei[] = {
/* Generated from convert_proto_tree_add_text.pl */
{ &ei_mpls_y1711_minimum_payload, { "mpls_y1711.minimum_payload", PI_MALFORMED, PI_ERROR, "Error: must have a minimum payload length of 44 bytes", EXPFILL }},
{ &ei_mpls_y1711_no_OAM_alert_label, { "mpls_y1711.no_OAM_alert_label", PI_PROTOCOL, PI_WARN, "Warning: Y.1711 but no OAM alert label (%d) ?!", EXPFILL }},
{ &ei_mpls_y1711_exp_bits_not_zero, { "mpls_y1711.exp_bits_not_0", PI_PROTOCOL, PI_WARN, "Warning: Exp bits should be 0 for Y.1711", EXPFILL }},
{ &ei_mpls_y1711_s_bit_not_one, { "mpls_y1711.s_bit_not_1", PI_PROTOCOL, PI_WARN, "Warning: S bit should be 1 for Y.1711", EXPFILL }},
{ &ei_mpls_y1711_ttl_not_one, { "mpls_y1711.ttl_not_1", PI_PROTOCOL, PI_WARN, "Warning: TTL should be 1 for Y.1711", EXPFILL }},
{ &ei_mpls_y1711_reserved_not_zero, { "mpls_y1711.reserved_not_zero", PI_PROTOCOL, PI_WARN, "Error: these bytes are reserved and must be 0x00", EXPFILL }},
{ &ei_mpls_y1711_padding_not_zero, { "mpls_y1711.padding_not_zero", PI_PROTOCOL, PI_WARN, "Error: these bytes are padding and must be 0x00", EXPFILL }},
{ &ei_mpls_y1711_padding_not_ff, { "mpls_y1711.padding_not_ff", PI_PROTOCOL, PI_WARN, "Error: these bytes are padding and must be 0xFF", EXPFILL }},
{ &ei_mpls_y1711_ttsi_not_preset, { "mpls_y1711.ttsi_not_preset", PI_PROTOCOL, PI_NOTE, "TTSI not preset (optional for FDI/BDI)", EXPFILL }},
{ &ei_mpls_y1711_unknown_pdu, { "mpls_y1711.unknown_pdu", PI_PROTOCOL, PI_WARN, "Unknown MPLS Y.1711 PDU", EXPFILL }},
};
expert_module_t* expert_mpls_y1711;
proto_mpls_y1711 =
proto_register_protocol("MPLS ITU-T Y.1711 OAM",
"MPLS ITU-T Y.1711 OAM",
"mpls_y1711");
proto_register_field_array(proto_mpls_y1711, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_mpls_y1711 = expert_register_protocol(proto_mpls_y1711);
expert_register_field_array(expert_mpls_y1711, ei, array_length(ei));
mpls_y1711_handle = register_dissector("mpls_y1711", dissect_mpls_y1711, proto_mpls_y1711);
}
void
proto_reg_handoff_mpls_y1711(void)
{
dissector_add_uint("mpls.label",
MPLS_LABEL_OAM_ALERT /* 14 */,
mpls_y1711_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
|
