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HACK: 2nd try to match RowsetProperties
[wireshark-wip.git] / epan / dissectors / packet-bfd.c
blob1dabdc7a47c09ad6dc05d11d4c03c851d7baaa1d
1 /* packet-bfd.c
2 * Routines for Bidirectional Forwarding Detection (BFD) message dissection
3 * RFCs 5880, 5881, 5882, 5883, 5884, 5885
4 * (and http://tools.ietf.org/html/draft-ietf-bfd-base-01 for version 0)
5 *
6 * Copyright 2003, Hannes Gredler <hannes@juniper.net>
7 * Copyright 2006, Balint Reczey <Balint.Reczey@ericsson.com>
8 * Copyright 2007, Todd J Martin <todd.martin@acm.org>
9 *
10 * Copyright 2011, Jaihari Kalijanakiraman <jaiharik@ipinfusion.com>
11 * Krishnamurthy Mayya <krishnamurthy.mayya@ipinfusion.com>
12 * Nikitha Malgi <malgi.nikitha@ipinfusion.com>
13 * - support for MPLS-TP BFD Proactive CV Message Format as per RFC 6428
14 * - includes decoding support for Section MEP-ID, LSP MEP-ID, PW MEP-ID
15 *
16 * $Id$
17 *
18 * Wireshark - Network traffic analyzer
19 * By Gerald Combs <gerald@wireshark.org>
20 * Copyright 1998 Gerald Combs
21 *
22 * This program is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU General Public License
24 * as published by the Free Software Foundation; either version 2
25 * of the License, or (at your option) any later version.
26 *
27 * This program is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 * GNU General Public License for more details.
31 *
32 * You should have received a copy of the GNU General Public License
33 * along with this program; if not, write to the Free Software
34 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
35 */
36
37 #include "config.h"
38
39 #include <glib.h>
40
41 #include <epan/packet.h>
42 #include <epan/expert.h>
43
44 #include "packet-bfd.h"
45
46 void proto_register_bfd(void);
47 void proto_reg_handoff_bfd(void);
48
49 #define UDP_PORT_BFD_1HOP_CONTROL 3784 /* draft-katz-ward-bfd-v4v6-1hop-00.txt */
50 #define UDP_PORT_BFD_MULTIHOP_CONTROL 4784 /* draft-ietf-bfd-multihop-05.txt */
51
52 /* As per RFC 6428 : http://tools.ietf.org/html/rfc6428
53 Section: 3.5 */
54 #define TLV_TYPE_MPLSTP_SECTION_MEP 0
55 #define TLV_TYPE_MPLSTP_LSP_MEP 1
56 #define TLV_TYPE_MPLSTP_PW_MEP 2
57
58 static const value_string mplstp_mep_tlv_type_values [] = {
59 { TLV_TYPE_MPLSTP_SECTION_MEP, "Section MEP-ID" },
60 { TLV_TYPE_MPLSTP_LSP_MEP, "LSP MEP-ID" },
61 { TLV_TYPE_MPLSTP_PW_MEP, "PW MEP-ID" },
62 { 0, NULL}
63 };
64 static const value_string bfd_control_v0_diag_values[] = {
65 { 0, "No Diagnostic" },
66 { 1, "Control Detection Time Expired" },
67 { 2, "Echo Function Failed" },
68 { 3, "Neighbor Signaled Session Down" },
69 { 4, "Forwarding Plane Reset" },
70 { 5, "Path Down" },
71 { 6, "Concatenated Path Down" },
72 { 7, "Administratively Down" },
73 { 0, NULL }
74 };
75
76 static const value_string bfd_control_v1_diag_values[] = {
77 { 0, "No Diagnostic" },
78 { 1, "Control Detection Time Expired" },
79 { 2, "Echo Function Failed" },
80 { 3, "Neighbor Signaled Session Down" },
81 { 4, "Forwarding Plane Reset" },
82 { 5, "Path Down" },
83 { 6, "Concatenated Path Down" },
84 { 7, "Administratively Down" },
85 { 8, "Reverse Concatenated Path Down" },
86 { 9, "Mis-Connectivity Defect" },
87 { 0, NULL }
88 };
89
90 static const value_string bfd_control_sta_values[] = {
91 { 0, "AdminDown" },
92 { 1, "Down" },
93 { 2, "Init" },
94 { 3, "Up" },
95 { 0, NULL }
96 };
97
98 #define BFD_AUTH_SIMPLE 1
99 #define BFD_AUTH_MD5 2
100 #define BFD_AUTH_MET_MD5 3
101 #define BFD_AUTH_SHA1 4
102 #define BFD_AUTH_MET_SHA1 5
103 static const value_string bfd_control_auth_type_values[] = {
104 { BFD_AUTH_SIMPLE , "Simple Password" },
105 { BFD_AUTH_MD5 , "Keyed MD5" },
106 { BFD_AUTH_MET_MD5 , "Meticulous Keyed MD5" },
107 { BFD_AUTH_SHA1 , "Keyed SHA1" },
108 { BFD_AUTH_MET_SHA1 , "Meticulous Keyed SHA1" },
109 { 0, NULL }
110 };
111 /* Per the standard, the simple password must by 1-16 bytes in length */
112 #define MAX_PASSWORD_LEN 16
113 /* Per the standard, the length of the MD5 authentication packets must be 24
114 * bytes and the checksum is 16 bytes */
115 #define MD5_AUTH_LEN 24
116 #define MD5_CHECKSUM_LEN 16
117 /* Per the standard, the length of the SHA1 authentication packets must be 28
118 * bytes and the checksum is 20 bytes */
119 #define SHA1_AUTH_LEN 28
120 #define SHA1_CHECKSUM_LEN 20
121
122 #define APPEND_BOOLEAN_FLAG(flag, item, string) \
123 if(flag){ \
124 if(item) \
125 proto_item_append_text(item, string, sep); \
126 sep = cont_sep; \
127 }
128 static const char *const initial_sep = " (";
129 static const char *const cont_sep = ", ";
130
131 static gint proto_bfd = -1;
132
133 static gint hf_bfd_version = -1;
134 static gint hf_bfd_diag = -1;
135 static gint hf_bfd_sta = -1;
136 /* static gint hf_bfd_flags = -1; */
137 static gint hf_bfd_flags_h = -1;
138 static gint hf_bfd_flags_p = -1;
139 static gint hf_bfd_flags_f = -1;
140 static gint hf_bfd_flags_c = -1;
141 static gint hf_bfd_flags_a = -1;
142 static gint hf_bfd_flags_d = -1;
143 static gint hf_bfd_flags_m = -1;
144 static gint hf_bfd_flags_d_v0 = -1;
145 static gint hf_bfd_flags_p_v0 = -1;
146 static gint hf_bfd_flags_f_v0 = -1;
147 static gint hf_bfd_detect_time_multiplier = -1;
148 static gint hf_bfd_message_length = -1;
149 static gint hf_bfd_my_discriminator = -1;
150 static gint hf_bfd_your_discriminator = -1;
151 static gint hf_bfd_desired_min_tx_interval = -1;
152 static gint hf_bfd_required_min_rx_interval = -1;
153 static gint hf_bfd_required_min_echo_interval = -1;
154
155 static gint hf_bfd_auth_type = -1;
156 static gint hf_bfd_auth_len = -1;
157 static gint hf_bfd_auth_key = -1;
158 static gint hf_bfd_auth_password = -1;
159 static gint hf_bfd_auth_seq_num = -1;
160
161 static gint ett_bfd = -1;
162 static gint ett_bfd_flags = -1;
163 static gint ett_bfd_auth = -1;
164
165 static expert_field ei_bfd_auth_len_invalid = EI_INIT;
166 static expert_field ei_bfd_auth_no_data = EI_INIT;
167
168 static gint hf_mep_type = -1;
169 static gint hf_mep_len = -1;
170 static gint hf_mep_global_id = -1;
171 static gint hf_mep_node_id = -1;
172 /* static gint hf_mep_interface_no = -1; */
173 static gint hf_mep_tunnel_no = -1;
174 static gint hf_mep_lsp_no = -1;
175 static gint hf_mep_ac_id = -1;
176 static gint hf_mep_agi_type = -1;
177 static gint hf_mep_agi_len = -1;
178 static gint hf_mep_agi_val = -1;
179 static gint hf_section_interface_no = -1;
180 /*
181 * Control packet version 0, draft-katz-ward-bfd-01.txt
182 *
183 * 0 1 2 3
184 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
185 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
186 * |Vers | Diag |H|D|P|F| Rsvd | Detect Mult | Length |
187 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
188 * | My Discriminator |
189 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
190 * | Your Discriminator |
191 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
192 * | Desired Min TX Interval |
193 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
194 * | Required Min RX Interval |
195 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
196 * | Required Min Echo RX Interval |
197 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
198 */
199
200 /*
201 * Control packet version 1, draft-ietf-bfd-base-04.txt
202 *
203 * 0 1 2 3
204 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
205 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
206 * |Vers | Diag |Sta|P|F|C|A|D|R| Detect Mult | Length |
207 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
208 * | My Discriminator |
209 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
210 * | Your Discriminator |
211 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
212 * | Desired Min TX Interval |
213 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
214 * | Required Min RX Interval |
215 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
216 * | Required Min Echo RX Interval |
217 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
218 *
219 * An optional Authentication Section may be present:
220 * 0 1 2 3
221 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
222 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
223 * | Auth Type | Auth Len | Authentication Data... |
224 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
225 *
226 * There are 5 types of authentication defined:
227 * 1 - Simple Password
228 * 2 - Keyed MD5
229 * 3 - Meticulous Keyed MD5
230 * 4 - Keyed SHA1
231 * 5 - Meticulous Keyed SHA1
232 *
233 * The format for Simple Password authentication is:
234 * 0 1 2 3
235 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
236 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
237 * | Auth Type | Auth Len | Auth Key ID | Password... |
238 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
239 * | ... |
240 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
241 *
242 * The format for Keyed MD5 and Meticulous Keyed MD5 authentication is:
243 * 0 1 2 3
244 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
245 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
246 * | Auth Type | Auth Len | Auth Key ID | Reserved |
247 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
248 * | Sequence Number |
249 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
250 * | Auth Key/Checksum... |
251 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
252 * | ... |
253 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
254 *
255 * The format for Keyed SHA1 and Meticulous Keyed SHA1 authentication is:
256 * 0 1 2 3
257 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
258 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
259 * | Auth Type | Auth Len | Auth Key ID | Reserved |
260 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
261 * | Sequence Number |
262 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
263 * | Auth Key/Checksum... |
264 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
265 * | ... |
266 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
267 *
268 *
269 */
270
271
272 /* Given the type of authentication being used, return the required length of
273 * the authentication header
274 */
275 static guint8
276 get_bfd_required_auth_len(guint8 auth_type)
277 {
278 guint8 auth_len = 0;
279
280 switch (auth_type) {
281 case BFD_AUTH_MD5:
282 case BFD_AUTH_MET_MD5:
283 auth_len = MD5_AUTH_LEN;
284 break;
285 case BFD_AUTH_SHA1:
286 case BFD_AUTH_MET_SHA1:
287 auth_len = SHA1_AUTH_LEN;
288 break;
289 default:
290 break;
291 }
292 return auth_len;
293 }
294
295 /* Given the type of authentication being used, return the length of
296 * checksum field
297 */
298 static guint8
299 get_bfd_checksum_len(guint8 auth_type)
300 {
301 guint8 checksum_len = 0;
302 switch (auth_type) {
303 case BFD_AUTH_MD5:
304 case BFD_AUTH_MET_MD5:
305 checksum_len = MD5_CHECKSUM_LEN;
306 break;
307 case BFD_AUTH_SHA1:
308 case BFD_AUTH_MET_SHA1:
309 checksum_len = SHA1_CHECKSUM_LEN;
310 break;
311 default:
312 break;
313 }
314 return checksum_len;
315 }
316
317 static void
318 dissect_bfd_authentication(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
319 {
320 int offset = 24;
321 guint8 auth_type;
322 guint8 auth_len;
323 proto_item *ti = NULL;
324 proto_item *auth_item = NULL;
325 proto_tree *auth_tree = NULL;
326 guint8 *password;
327
328 auth_type = tvb_get_guint8(tvb, offset);
329 auth_len = tvb_get_guint8(tvb, offset + 1);
330
331 if (tree) {
332 auth_item = proto_tree_add_text(tree, tvb, offset, auth_len, "Authentication: %s",
333 val_to_str(auth_type,
334 bfd_control_auth_type_values,
335 "Unknown Authentication Type (%d)") );
336 auth_tree = proto_item_add_subtree(auth_item, ett_bfd_auth);
337
338 proto_tree_add_item(auth_tree, hf_bfd_auth_type, tvb, offset, 1, ENC_BIG_ENDIAN);
339
340 ti = proto_tree_add_item(auth_tree, hf_bfd_auth_len, tvb, offset + 1, 1, ENC_BIG_ENDIAN);
341 proto_item_append_text(ti, " bytes");
342
343 proto_tree_add_item(auth_tree, hf_bfd_auth_key, tvb, offset + 2, 1, ENC_BIG_ENDIAN);
344 }
345
346 switch (auth_type) {
347 case BFD_AUTH_SIMPLE:
348 if (tree) {
349 password = tvb_get_string(wmem_packet_scope(), tvb, offset+3, auth_len-3);
350 proto_tree_add_string(auth_tree, hf_bfd_auth_password, tvb, offset+3,
351 auth_len-3, password);
352 proto_item_append_text(auth_item, ": %s", password);
353 }
354 break;
355 case BFD_AUTH_MD5:
356 case BFD_AUTH_MET_MD5:
357 case BFD_AUTH_SHA1:
358 case BFD_AUTH_MET_SHA1:
359 if (auth_len != get_bfd_required_auth_len(auth_type)) {
360 if (tree) {
361 ti = proto_tree_add_text(auth_tree, tvb, offset, auth_len,
362 "Length of authentication is invalid (%d)", auth_len);
363 proto_item_append_text(auth_item, ": Invalid Authentication Section");
364 }
365 expert_add_info_format(pinfo, ti, &ei_bfd_auth_len_invalid,
366 "Length of authentication section is invalid for Authentication Type: %s",
367 val_to_str(auth_type, bfd_control_auth_type_values, "Unknown Authentication Type (%d)") );
368 }
369
370 if (tree) {
371 proto_tree_add_item(auth_tree, hf_bfd_auth_seq_num, tvb, offset+4, 4, ENC_BIG_ENDIAN);
372
373 proto_tree_add_text(auth_tree, tvb, offset+8, get_bfd_checksum_len(auth_type), "Checksum: 0x%s",
374 tvb_bytes_to_str(tvb, offset+8, get_bfd_checksum_len(auth_type)) );
375 }
376 break;
377 default:
378 break;
379 }
380 }
381
382
383 static void
384 dissect_bfd_control(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
385 {
386 guint flags;
387 guint bfd_version;
388 guint bfd_diag;
389 guint bfd_sta = 0;
390 guint bfd_flags;
391 guint bfd_flags_h = 0;
392 guint bfd_flags_p = 0;
393 guint bfd_flags_f = 0;
394 guint bfd_flags_c = 0;
395 guint bfd_flags_a = 0;
396 guint bfd_flags_d = 0;
397 guint bfd_flags_m = 0;
398 guint bfd_flags_d_v0 = 0;
399 guint bfd_flags_p_v0 = 0;
400 guint bfd_flags_f_v0 = 0;
401 guint bfd_detect_time_multiplier;
402 guint bfd_length;
403 guint bfd_my_discriminator;
404 guint bfd_your_discriminator;
405 guint bfd_desired_min_tx_interval;
406 guint bfd_required_min_rx_interval;
407 guint bfd_required_min_echo_interval;
408 proto_tree *bfd_tree = NULL;
409
410 col_set_str(pinfo->cinfo, COL_PROTOCOL, "BFD Control");
411 col_clear(pinfo->cinfo, COL_INFO);
412
413 bfd_version = (tvb_get_guint8(tvb, 0) & 0xe0) >> 5;
414 bfd_diag = (tvb_get_guint8(tvb, 0) & 0x1f);
415 flags = tvb_get_guint8(tvb, 1);
416 switch (bfd_version) {
417 case 0:
418 bfd_flags = flags;
419 bfd_flags_h = flags & 0x80;
420 bfd_flags_d_v0 = flags & 0x40;
421 bfd_flags_p_v0 = flags & 0x20;
422 bfd_flags_f_v0 = flags & 0x10;
423 break;
424 case 1:
425 default:
426 bfd_sta = flags & 0xc0;
427 bfd_flags = flags & 0x3e;
428 bfd_flags_p = flags & 0x20;
429 bfd_flags_f = flags & 0x10;
430 bfd_flags_c = flags & 0x08;
431 bfd_flags_a = flags & 0x04;
432 bfd_flags_d = flags & 0x02;
433 bfd_flags_m = flags & 0x01;
434 break;
435 }
436
437 bfd_detect_time_multiplier = tvb_get_guint8(tvb, 2);
438 bfd_length = tvb_get_guint8(tvb, 3);
439 bfd_my_discriminator = tvb_get_ntohl(tvb, 4);
440 bfd_your_discriminator = tvb_get_ntohl(tvb, 8);
441 bfd_desired_min_tx_interval = tvb_get_ntohl(tvb, 12);
442 bfd_required_min_rx_interval = tvb_get_ntohl(tvb, 16);
443 bfd_required_min_echo_interval = tvb_get_ntohl(tvb, 20);
444
445 switch (bfd_version) {
446 case 0:
447 col_add_fstr(pinfo->cinfo, COL_INFO, "Diag: %s, Flags: 0x%02x",
448 val_to_str_const(bfd_diag, bfd_control_v0_diag_values, "Unknown"),
449 bfd_flags);
450 break;
451 case 1:
452 default:
453 col_add_fstr(pinfo->cinfo, COL_INFO, "Diag: %s, State: %s, Flags: 0x%02x",
454 val_to_str_const(bfd_diag, bfd_control_v1_diag_values, "Unknown"),
455 val_to_str_const(bfd_sta >> 6 , bfd_control_sta_values, "Unknown"),
456 bfd_flags);
457 break;
458 }
459
460 if (tree) {
461 proto_item *ti;
462 proto_tree *bfd_flags_tree;
463 const char *sep;
464
465 ti = proto_tree_add_protocol_format(tree, proto_bfd, tvb, 0, bfd_length,
466 "BFD Control message");
467
468 bfd_tree = proto_item_add_subtree(ti, ett_bfd);
469
470 proto_tree_add_uint(bfd_tree, hf_bfd_version, tvb, 0,
471 1, bfd_version << 5);
472
473 proto_tree_add_uint(bfd_tree, hf_bfd_diag, tvb, 0,
474 1, bfd_diag);
475
476 switch (bfd_version) {
477 case 0:
478 break;
479 case 1:
480 default:
481 proto_tree_add_uint(bfd_tree, hf_bfd_sta, tvb, 1,
482 1, bfd_sta);
483
484 break;
485 }
486 switch (bfd_version) {
487 case 0:
488 ti = proto_tree_add_text ( bfd_tree, tvb, 1, 1, "Message Flags: 0x%02x",
489 bfd_flags);
490 bfd_flags_tree = proto_item_add_subtree(ti, ett_bfd_flags);
491 proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_h, tvb, 1, 1, bfd_flags_h);
492 proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_d_v0, tvb, 1, 1, bfd_flags_d_v0);
493 proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_p_v0, tvb, 1, 1, bfd_flags_p_v0);
494 proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_f_v0, tvb, 1, 1, bfd_flags_f_v0);
495
496 sep = initial_sep;
497 APPEND_BOOLEAN_FLAG(bfd_flags_h, ti, "%sH");
498 APPEND_BOOLEAN_FLAG(bfd_flags_d_v0, ti, "%sD");
499 APPEND_BOOLEAN_FLAG(bfd_flags_p_v0, ti, "%sP");
500 APPEND_BOOLEAN_FLAG(bfd_flags_f_v0, ti, "%sF");
501 if (sep != initial_sep) {
502 proto_item_append_text (ti, ")");
503 }
504 break;
505 case 1:
506 default:
507 ti = proto_tree_add_text ( bfd_tree, tvb, 1, 1, "Message Flags: 0x%02x",
508 bfd_flags);
509 bfd_flags_tree = proto_item_add_subtree(ti, ett_bfd_flags);
510 proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_p, tvb, 1, 1, bfd_flags_p);
511 proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_f, tvb, 1, 1, bfd_flags_f);
512 proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_c, tvb, 1, 1, bfd_flags_c);
513 proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_a, tvb, 1, 1, bfd_flags_a);
514 proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_d, tvb, 1, 1, bfd_flags_d);
515 proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_m, tvb, 1, 1, bfd_flags_m);
516
517 sep = initial_sep;
518 APPEND_BOOLEAN_FLAG(bfd_flags_p, ti, "%sP");
519 APPEND_BOOLEAN_FLAG(bfd_flags_f, ti, "%sF");
520 APPEND_BOOLEAN_FLAG(bfd_flags_c, ti, "%sC");
521 APPEND_BOOLEAN_FLAG(bfd_flags_a, ti, "%sA");
522 APPEND_BOOLEAN_FLAG(bfd_flags_d, ti, "%sD");
523 APPEND_BOOLEAN_FLAG(bfd_flags_m, ti, "%sM");
524 if (sep != initial_sep) {
525 proto_item_append_text (ti, ")");
526 }
527 break;
528 }
529
530 proto_tree_add_uint_format_value(bfd_tree, hf_bfd_detect_time_multiplier, tvb, 2,
531 1, bfd_detect_time_multiplier,
532 "%u (= %u ms Detection time)",
533 bfd_detect_time_multiplier,
534 bfd_detect_time_multiplier * (bfd_desired_min_tx_interval/1000));
535
536 proto_tree_add_uint_format_value(bfd_tree, hf_bfd_message_length, tvb, 3, 1, bfd_length,
537 "%u bytes", bfd_length);
538
539 proto_tree_add_uint(bfd_tree, hf_bfd_my_discriminator, tvb, 4,
540 4, bfd_my_discriminator);
541
542 proto_tree_add_uint(bfd_tree, hf_bfd_your_discriminator, tvb, 8,
543 4, bfd_your_discriminator);
544
545 proto_tree_add_uint_format_value(bfd_tree, hf_bfd_desired_min_tx_interval, tvb, 12,
546 4, bfd_desired_min_tx_interval,
547 "%4u ms (%u us)",
548 bfd_desired_min_tx_interval/1000,
549 bfd_desired_min_tx_interval);
550
551 proto_tree_add_uint_format_value(bfd_tree, hf_bfd_required_min_rx_interval, tvb, 16,
552 4, bfd_required_min_rx_interval,
553 "%4u ms (%u us)",
554 bfd_required_min_rx_interval/1000,
555 bfd_required_min_rx_interval);
556
557 proto_tree_add_uint_format_value(bfd_tree, hf_bfd_required_min_echo_interval, tvb, 20,
558 4, bfd_required_min_echo_interval,
559 "%4u ms (%u us)",
560 bfd_required_min_echo_interval/1000,
561 bfd_required_min_echo_interval);
562 } /* if (tree) */
563
564 /* Dissect the authentication fields if the Authentication flag has
565 * been set
566 */
567 if (bfd_version && bfd_flags_a) {
568 if (bfd_length >= 28) {
569 dissect_bfd_authentication(tvb, pinfo, bfd_tree);
570 } else {
571 proto_item *ti = proto_tree_add_text(bfd_tree, tvb, 24, bfd_length-24,
572 "Authentication: Length of the BFD frame is invalid (%d)", bfd_length);
573 expert_add_info(pinfo, ti, &ei_bfd_auth_no_data);
574 }
575 }
576
577 return;
578 }
579
580 /* BFD CV Source MEP-ID TLV Decoder,
581 As per RFC 6428 : http://tools.ietf.org/html/rfc6428
582 sections - 3.5.1, 3.5.2, 3.5.3 */
583 void
584 dissect_bfd_mep (tvbuff_t *tvb, proto_tree *tree, const int hfindex)
585 {
586 proto_item *ti;
587 proto_tree *bfd_tree;
588 gint offset = 0;
589 gint mep_type;
590 gint mep_len;
591 gint mep_agi_len;
592
593 if (!tree)
594 return;
595
596 /* Fetch the BFD control message length and move the offset
597 to point to the data portion after the control message */
598
599 /* The parameter hfindex is used for determining the tree under which MEP-ID TLV
600 has to be determined. Since according to RFC 6428, MEP-ID TLV can be used by any
601 OAM function, if hfindex is 0, as per this function the MEP-TLV is a part of
602 BFD-CV payload. If a non-zero hfindex comes, then tht TLV info will be displayed
603 under a particular protocol-tree. */
604 if (!hfindex)
605 {
606 offset = tvb_get_guint8(tvb, 3);
607 mep_type = tvb_get_ntohs (tvb, offset);
608 mep_len = tvb_get_ntohs (tvb, (offset + 2));
609 ti = proto_tree_add_protocol_format (tree, proto_bfd, tvb, offset, (mep_len + 4),
610 "MPLS-TP SOURCE MEP-ID TLV");
611 }
612 else
613 {
614 mep_type = tvb_get_ntohs (tvb, offset);
615 mep_len = tvb_get_ntohs (tvb, (offset + 2));
616 ti = proto_tree_add_protocol_format (tree, hfindex, tvb, offset, (mep_len + 4),
617 "MPLS-TP SOURCE MEP-ID TLV");
618 }
619
620 switch (mep_type) {
621 case TLV_TYPE_MPLSTP_SECTION_MEP:
622
623 bfd_tree = proto_item_add_subtree (ti, ett_bfd);
624 proto_tree_add_uint (bfd_tree, hf_mep_type , tvb, offset,
625 2, mep_type);
626 proto_tree_add_uint (bfd_tree, hf_mep_len, tvb, (offset + 2),
627 2, mep_len);
628 proto_tree_add_item (bfd_tree, hf_mep_global_id, tvb, (offset + 4),
629 4, ENC_BIG_ENDIAN);
630 proto_tree_add_item (bfd_tree, hf_mep_node_id, tvb, (offset + 8),
631 4, ENC_BIG_ENDIAN);
632 proto_tree_add_item (bfd_tree, hf_section_interface_no, tvb, (offset + 12),
633 4, ENC_BIG_ENDIAN);
634
635 break;
636
637 case TLV_TYPE_MPLSTP_LSP_MEP:
638
639 bfd_tree = proto_item_add_subtree (ti, ett_bfd);
640 proto_tree_add_uint (bfd_tree, hf_mep_type , tvb, offset,
641 2, mep_type);
642 proto_tree_add_uint (bfd_tree, hf_mep_len, tvb, (offset + 2),
643 2, mep_len);
644 proto_tree_add_item (bfd_tree, hf_mep_global_id, tvb, (offset + 4),
645 4, ENC_BIG_ENDIAN);
646 proto_tree_add_item (bfd_tree, hf_mep_node_id, tvb, (offset + 8),
647 4, ENC_BIG_ENDIAN);
648 proto_tree_add_item (bfd_tree, hf_mep_tunnel_no, tvb, (offset + 12),
649 2, ENC_BIG_ENDIAN);
650 proto_tree_add_item (bfd_tree, hf_mep_lsp_no, tvb, (offset + 14),
651 2, ENC_BIG_ENDIAN);
652
653 break;
654
655 case TLV_TYPE_MPLSTP_PW_MEP:
656
657 mep_agi_len = tvb_get_guint8 (tvb, (offset + 17));
658 bfd_tree = proto_item_add_subtree (ti, ett_bfd);
659 proto_tree_add_uint (bfd_tree, hf_mep_type, tvb, offset,
660 2, (mep_type));
661 proto_tree_add_uint (bfd_tree, hf_mep_len, tvb, (offset + 2),
662 2, mep_len);
663 proto_tree_add_item (bfd_tree, hf_mep_global_id, tvb, (offset + 4),
664 4, ENC_BIG_ENDIAN);
665 proto_tree_add_item (bfd_tree, hf_mep_node_id, tvb, (offset + 8),
666 4, ENC_BIG_ENDIAN);
667 proto_tree_add_item (bfd_tree, hf_mep_ac_id, tvb, (offset + 12),
668 4, ENC_BIG_ENDIAN);
669 proto_tree_add_item (bfd_tree, hf_mep_agi_type, tvb, (offset + 16),
670 1, ENC_BIG_ENDIAN);
671 proto_tree_add_uint (bfd_tree, hf_mep_agi_len, tvb, (offset + 17),
672 1, mep_agi_len);
673 proto_tree_add_item (bfd_tree, hf_mep_agi_val, tvb, (offset + 18),
674 mep_agi_len, ENC_ASCII|ENC_NA);
675
676 break;
677
678 default:
679 break;
680 }
681 return;
682 }
683
684 /* Register the protocol with Wireshark */
685 void
686 proto_register_bfd(void)
687 {
688
689 /* Setup list of header fields */
690 static hf_register_info hf[] = {
691 { &hf_bfd_version,
692 { "Protocol Version", "bfd.version",
693 FT_UINT8, BASE_DEC, NULL , 0xe0,
694 "The version number of the BFD protocol", HFILL }
695 },
696 { &hf_bfd_diag,
697 { "Diagnostic Code", "bfd.diag",
698 FT_UINT8, BASE_HEX, VALS(bfd_control_v1_diag_values), 0x1f,
699 "This field give the reason for a BFD session failure", HFILL }
700 },
701 { &hf_bfd_sta,
702 { "Session State", "bfd.sta",
703 FT_UINT8, BASE_HEX, VALS(bfd_control_sta_values), 0xc0,
704 "The BFD state as seen by the transmitting system", HFILL }
705 },
706 #if 0
707 { &hf_bfd_flags,
708 { "Message Flags", "bfd.flags",
709 FT_UINT8, BASE_HEX, NULL, 0xf0,
710 NULL, HFILL }
711 },
712 #endif
713 { &hf_bfd_flags_h,
714 { "I hear you", "bfd.flags.h",
715 FT_BOOLEAN, 8, TFS(&tfs_set_notset), 0x80,
716 NULL, HFILL }
717 },
718 { &hf_bfd_flags_d_v0,
719 { "Demand", "bfd.flags.d",
720 FT_BOOLEAN, 8, TFS(&tfs_set_notset), 0x40,
721 NULL, HFILL }
722 },
723 { &hf_bfd_flags_p_v0,
724 { "Poll", "bfd.flags.p",
725 FT_BOOLEAN, 8, TFS(&tfs_set_notset), 0x20,
726 NULL, HFILL }
727 },
728 { &hf_bfd_flags_f_v0,
729 { "Final", "bfd.flags.f",
730 FT_BOOLEAN, 8, TFS(&tfs_set_notset), 0x10,
731 NULL, HFILL }
732 },
733 { &hf_bfd_flags_p,
734 { "Poll", "bfd.flags.p",
735 FT_BOOLEAN, 6, TFS(&tfs_set_notset), 0x20, /* 6 flag bits; Sta is shown separately */
736 "If set, the transmitting system is expecting a packet with the Final (F) bit in reply",
737 HFILL }
738 },
739 { &hf_bfd_flags_f,
740 { "Final", "bfd.flags.f",
741 FT_BOOLEAN, 6, TFS(&tfs_set_notset), 0x10, /* 6 flag bits; Sta is shown separately */
742 "If set, the transmitting system is replying to a packet with the Poll (P) bit set",
743 HFILL }
744 },
745 { &hf_bfd_flags_c,
746 { "Control Plane Independent", "bfd.flags.c",
747 FT_BOOLEAN, 6, TFS(&tfs_set_notset), 0x08, /* 6 flag bits; Sta is shown separately */
748 "If set, the BFD implementation is implemented in the forwarding plane", HFILL }
749 },
750 { &hf_bfd_flags_a,
751 { "Authentication Present", "bfd.flags.a",
752 FT_BOOLEAN, 6, TFS(&tfs_set_notset), 0x04, /* 6 flag bits; Sta is shown separately */
753 "The Authentication Section is present", HFILL }
754 },
755 { &hf_bfd_flags_d,
756 { "Demand", "bfd.flags.d",
757 FT_BOOLEAN, 6, TFS(&tfs_set_notset), 0x02, /* 6 flag bits; Sta is shown separately */
758 "If set, Demand mode is active in the transmitting system", HFILL }
759 },
760 { &hf_bfd_flags_m,
761 { "Multipoint", "bfd.flags.m",
762 FT_BOOLEAN, 6, TFS(&tfs_set_notset), 0x01, /* 6 flag bits; Sta is shown separately */
763 "Reserved for future point-to-multipoint extensions", HFILL }
764 },
765 { &hf_bfd_detect_time_multiplier,
766 { "Detect Time Multiplier", "bfd.detect_time_multiplier",
767 FT_UINT8, BASE_DEC, NULL, 0x0,
768 "The transmit interval multiplied by this value is the failure detection time", HFILL }
769 },
770 { &hf_bfd_message_length,
771 { "Message Length", "bfd.message_length",
772 FT_UINT8, BASE_DEC, NULL, 0x0,
773 "Length of the BFD Control packet, in bytes", HFILL }
774 },
775 { &hf_bfd_my_discriminator,
776 { "My Discriminator", "bfd.my_discriminator",
777 FT_UINT32, BASE_HEX, NULL, 0x0,
778 NULL, HFILL }
779 },
780 { &hf_bfd_your_discriminator,
781 { "Your Discriminator", "bfd.your_discriminator",
782 FT_UINT32, BASE_HEX, NULL, 0x0,
783 NULL, HFILL }
784 },
785 { &hf_bfd_desired_min_tx_interval,
786 { "Desired Min TX Interval", "bfd.desired_min_tx_interval",
787 FT_UINT32, BASE_DEC, NULL, 0x0,
788 "The minimum interval to use when transmitting BFD Control packets", HFILL }
789 },
790 { &hf_bfd_required_min_rx_interval,
791 { "Required Min RX Interval", "bfd.required_min_rx_interval",
792 FT_UINT32, BASE_DEC, NULL, 0x0,
793 "The minimum interval between received BFD Control packets that this system can support", HFILL }
794 },
795 { &hf_bfd_required_min_echo_interval,
796 { "Required Min Echo Interval", "bfd.required_min_echo_interval",
797 FT_UINT32, BASE_DEC, NULL, 0x0,
798 "The minimum interval between received BFD Echo packets that this system can support", HFILL }
799 },
800 { &hf_bfd_auth_type,
801 { "Authentication Type", "bfd.auth.type",
802 FT_UINT8, BASE_DEC, VALS(bfd_control_auth_type_values), 0x0,
803 "The type of authentication in use on this session", HFILL }
804 },
805 { &hf_bfd_auth_len,
806 { "Authentication Length", "bfd.auth.len",
807 FT_UINT8, BASE_DEC, NULL, 0x0,
808 "The length, in bytes, of the authentication section", HFILL }
809 },
810 { &hf_bfd_auth_key,
811 { "Authentication Key ID", "bfd.auth.key",
812 FT_UINT8, BASE_DEC, NULL, 0x0,
813 "The Authentication Key ID, identifies which password is in use for this packet", HFILL }
814 },
815 { &hf_bfd_auth_password,
816 { "Password", "bfd.auth.password",
817 FT_STRING, BASE_NONE, NULL, 0x0,
818 "The simple password in use on this session", HFILL }
819 },
820 { &hf_bfd_auth_seq_num,
821 { "Sequence Number", "bfd.auth.seq_num",
822 FT_UINT32, BASE_HEX, NULL, 0x0,
823 "The Sequence Number is periodically incremented to prevent replay attacks", HFILL }
824 },
825 { &hf_mep_type,
826 { "Type", "bfd.mep.type",
827 FT_UINT16, BASE_DEC, VALS(mplstp_mep_tlv_type_values), 0x0,
828 "The type of the MEP Id", HFILL }
829 },
830 { &hf_mep_len,
831 { "Length", "bfd.mep.len",
832 FT_UINT16, BASE_DEC, NULL , 0x0,
833 "The length of the MEP Id", HFILL }
834 },
835 { &hf_mep_global_id,
836 { "Global Id", "bfd.mep.global.id",
837 FT_UINT32, BASE_DEC, NULL , 0x0,
838 "MPLS-TP Global MEP Id", HFILL }
839 },
840 { &hf_mep_node_id,
841 { "Node Id", "bfd.mep.node.id",
842 FT_IPv4, BASE_NONE, NULL , 0x0,
843 "MPLS-TP Node Identifier", HFILL }
844 },
845 #if 0
846 { &hf_mep_interface_no,
847 { "Interface Number", "bfd.mep.interface.no",
848 FT_UINT32, BASE_DEC, NULL , 0x0,
849 "MPLS-TP Interface Number", HFILL }
850 },
851 #endif
852 { &hf_mep_tunnel_no,
853 { "Tunnel Number", "bfd.mep.tunnel.no",
854 FT_UINT16, BASE_DEC, NULL , 0x0,
855 NULL, HFILL }
856 },
857 { &hf_mep_lsp_no,
858 { "LSP Number", "bfd.mep.lsp.no",
859 FT_UINT16, BASE_DEC, NULL , 0x0,
860 NULL, HFILL }
861 },
862 { &hf_mep_ac_id,
863 { "AC Id", "bfd.mep.ac.id",
864 FT_UINT32, BASE_DEC, NULL , 0x0,
865 NULL, HFILL }
866 },
867 { &hf_mep_agi_type,
868 { "AGI TYPE", "bfd.mep.agi.type",
869 FT_UINT8, BASE_DEC, NULL , 0x0,
870 NULL, HFILL }
871 },
872 { &hf_mep_agi_len,
873 { "AGI Length", "bfd.mep.agi.len",
874 FT_UINT8, BASE_DEC, NULL , 0x0,
875 NULL, HFILL }
876 },
877 { &hf_mep_agi_val,
878 { "AGI value", "bfd.mep.agi.val",
879 FT_STRING, BASE_NONE, NULL , 0x0,
880 NULL, HFILL }
881 },
882 { &hf_section_interface_no,
883 { "Interface Number", "bfd.mep.interface.no",
884 FT_UINT32, BASE_DEC, NULL , 0x0,
885 "MPLS-TP Interface Number", HFILL }
886 }
887 };
888
889 /* Setup protocol subtree array */
890 static gint *ett[] = {
891 &ett_bfd,
892 &ett_bfd_flags,
893 &ett_bfd_auth
894 };
895
896 static ei_register_info ei[] = {
897 { &ei_bfd_auth_len_invalid, { "bfd.auth.len.invalid", PI_MALFORMED, PI_WARN, "Length of authentication section is invalid", EXPFILL }},
898 { &ei_bfd_auth_no_data, { "bfd.auth.no_data", PI_MALFORMED, PI_WARN, "Authentication flag is set in a BFD packet, but no authentication data is present", EXPFILL }},
899 };
900
901 expert_module_t* expert_bfd;
902
903 /* Register the protocol name and description */
904 proto_bfd = proto_register_protocol("Bidirectional Forwarding Detection Control Message",
905 "BFD Control",
906 "bfd");
907 register_dissector("bfd", dissect_bfd_control, proto_bfd);
908
909 /* Required function calls to register the header fields and subtrees used */
910 proto_register_field_array(proto_bfd, hf, array_length(hf));
911 proto_register_subtree_array(ett, array_length(ett));
912 expert_bfd = expert_register_protocol(proto_bfd);
913 expert_register_field_array(expert_bfd, ei, array_length(ei));
914 }
915
916 void
917 proto_reg_handoff_bfd(void)
918 {
919 dissector_handle_t bfd_control_handle;
920
921 bfd_control_handle = find_dissector("bfd");
922 dissector_add_uint("udp.port", UDP_PORT_BFD_1HOP_CONTROL, bfd_control_handle);
923 dissector_add_uint("udp.port", UDP_PORT_BFD_MULTIHOP_CONTROL, bfd_control_handle);
924 }