1 /*
2 * Copyright (c) 1998-2006 The TCPDUMP project
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that: (1) source code
6 * distributions retain the above copyright notice and this paragraph
7 * in its entirety, and (2) distributions including binary code include
8 * the above copyright notice and this paragraph in its entirety in
9 * the documentation or other materials provided with the distribution.
10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
11 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
12 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
13 * FOR A PARTICULAR PURPOSE.
14 *
15 * Original code by Hannes Gredler (hannes@gredler.at)
16 */
17
18 /* \summary: IEEE 802.1ag Connectivity Fault Management (CFM) protocols printer */
19
20 #ifdef HAVE_CONFIG_H
21 #include "config.h"
22 #endif
23
24 #include <netdissect-stdinc.h>
25
26 #include <stdio.h>
27
28 #include "netdissect.h"
29 #include "extract.h"
30 #include "ether.h"
31 #include "addrtoname.h"
32 #include "oui.h"
33 #include "af.h"
34
35 struct cfm_common_header_t {
36 uint8_t mdlevel_version;
37 uint8_t opcode;
38 uint8_t flags;
39 uint8_t first_tlv_offset;
40 };
41
42 #define CFM_VERSION 0
43 #define CFM_EXTRACT_VERSION(x) (((x)&0x1f))
44 #define CFM_EXTRACT_MD_LEVEL(x) (((x)&0xe0)>>5)
45
46 #define CFM_OPCODE_CCM 1
47 #define CFM_OPCODE_LBR 2
48 #define CFM_OPCODE_LBM 3
49 #define CFM_OPCODE_LTR 4
50 #define CFM_OPCODE_LTM 5
51
52 static const struct tok cfm_opcode_values[] = {
53 { CFM_OPCODE_CCM, "Continouity Check Message"},
54 { CFM_OPCODE_LBR, "Loopback Reply"},
55 { CFM_OPCODE_LBM, "Loopback Message"},
56 { CFM_OPCODE_LTR, "Linktrace Reply"},
57 { CFM_OPCODE_LTM, "Linktrace Message"},
58 { 0, NULL}
59 };
60
61 /*
62 * Message Formats.
63 */
64 struct cfm_ccm_t {
65 uint8_t sequence[4];
66 uint8_t ma_epi[2];
67 uint8_t names[48];
68 uint8_t itu_t_y_1731[16];
69 };
70
71 /*
72 * Timer Bases for the CCM Interval field.
73 * Expressed in units of seconds.
74 */
75 static const float ccm_interval_base[8] = {0, 0.003333, 0.01, 0.1, 1, 10, 60, 600};
76 #define CCM_INTERVAL_MIN_MULTIPLIER 3.25
77 #define CCM_INTERVAL_MAX_MULTIPLIER 3.5
78
79 #define CFM_CCM_RDI_FLAG 0x80
80 #define CFM_EXTRACT_CCM_INTERVAL(x) (((x)&0x07))
81
82 #define CFM_CCM_MD_FORMAT_8021 0
83 #define CFM_CCM_MD_FORMAT_NONE 1
84 #define CFM_CCM_MD_FORMAT_DNS 2
85 #define CFM_CCM_MD_FORMAT_MAC 3
86 #define CFM_CCM_MD_FORMAT_CHAR 4
87
88 static const struct tok cfm_md_nameformat_values[] = {
89 { CFM_CCM_MD_FORMAT_8021, "IEEE 802.1"},
90 { CFM_CCM_MD_FORMAT_NONE, "No MD Name present"},
91 { CFM_CCM_MD_FORMAT_DNS, "DNS string"},
92 { CFM_CCM_MD_FORMAT_MAC, "MAC + 16Bit Integer"},
93 { CFM_CCM_MD_FORMAT_CHAR, "Character string"},
94 { 0, NULL}
95 };
96
97 #define CFM_CCM_MA_FORMAT_8021 0
98 #define CFM_CCM_MA_FORMAT_VID 1
99 #define CFM_CCM_MA_FORMAT_CHAR 2
100 #define CFM_CCM_MA_FORMAT_INT 3
101 #define CFM_CCM_MA_FORMAT_VPN 4
102
103 static const struct tok cfm_ma_nameformat_values[] = {
104 { CFM_CCM_MA_FORMAT_8021, "IEEE 802.1"},
105 { CFM_CCM_MA_FORMAT_VID, "Primary VID"},
106 { CFM_CCM_MA_FORMAT_CHAR, "Character string"},
107 { CFM_CCM_MA_FORMAT_INT, "16Bit Integer"},
108 { CFM_CCM_MA_FORMAT_VPN, "RFC2685 VPN-ID"},
109 { 0, NULL}
110 };
111
112 struct cfm_lbm_t {
113 uint8_t transaction_id[4];
114 };
115
116 struct cfm_ltm_t {
117 uint8_t transaction_id[4];
118 uint8_t ttl;
119 uint8_t original_mac[ETHER_ADDR_LEN];
120 uint8_t target_mac[ETHER_ADDR_LEN];
121 };
122
123 static const struct tok cfm_ltm_flag_values[] = {
124 { 0x80, "Use Forwarding-DB only"},
125 { 0, NULL}
126 };
127
128 struct cfm_ltr_t {
129 uint8_t transaction_id[4];
130 uint8_t ttl;
131 uint8_t replay_action;
132 };
133
134 static const struct tok cfm_ltr_flag_values[] = {
135 { 0x80, "UseFDB Only"},
136 { 0x40, "FwdYes"},
137 { 0x20, "Terminal MEP"},
138 { 0, NULL}
139 };
140
141 static const struct tok cfm_ltr_replay_action_values[] = {
142 { 1, "Exact Match"},
143 { 2, "Filtering DB"},
144 { 3, "MIP CCM DB"},
145 { 0, NULL}
146 };
147
148
149 #define CFM_TLV_END 0
150 #define CFM_TLV_SENDER_ID 1
151 #define CFM_TLV_PORT_STATUS 2
152 #define CFM_TLV_INTERFACE_STATUS 3
153 #define CFM_TLV_DATA 4
154 #define CFM_TLV_REPLY_INGRESS 5
155 #define CFM_TLV_REPLY_EGRESS 6
156 #define CFM_TLV_PRIVATE 31
157
158 static const struct tok cfm_tlv_values[] = {
159 { CFM_TLV_END, "End"},
160 { CFM_TLV_SENDER_ID, "Sender ID"},
161 { CFM_TLV_PORT_STATUS, "Port status"},
162 { CFM_TLV_INTERFACE_STATUS, "Interface status"},
163 { CFM_TLV_DATA, "Data"},
164 { CFM_TLV_REPLY_INGRESS, "Reply Ingress"},
165 { CFM_TLV_REPLY_EGRESS, "Reply Egress"},
166 { CFM_TLV_PRIVATE, "Organization Specific"},
167 { 0, NULL}
168 };
169
170 /*
171 * TLVs
172 */
173
174 struct cfm_tlv_header_t {
175 uint8_t type;
176 uint8_t length[2];
177 };
178
179 /* FIXME define TLV formats */
180
181 static const struct tok cfm_tlv_port_status_values[] = {
182 { 1, "Blocked"},
183 { 2, "Up"},
184 { 0, NULL}
185 };
186
187 static const struct tok cfm_tlv_interface_status_values[] = {
188 { 1, "Up"},
189 { 2, "Down"},
190 { 3, "Testing"},
191 { 5, "Dormant"},
192 { 6, "not present"},
193 { 7, "lower Layer down"},
194 { 0, NULL}
195 };
196
197 #define CFM_CHASSIS_ID_CHASSIS_COMPONENT 1
198 #define CFM_CHASSIS_ID_INTERFACE_ALIAS 2
199 #define CFM_CHASSIS_ID_PORT_COMPONENT 3
200 #define CFM_CHASSIS_ID_MAC_ADDRESS 4
201 #define CFM_CHASSIS_ID_NETWORK_ADDRESS 5
202 #define CFM_CHASSIS_ID_INTERFACE_NAME 6
203 #define CFM_CHASSIS_ID_LOCAL 7
204
205 static const struct tok cfm_tlv_senderid_chassisid_values[] = {
206 { 0, "Reserved"},
207 { CFM_CHASSIS_ID_CHASSIS_COMPONENT, "Chassis component"},
208 { CFM_CHASSIS_ID_INTERFACE_ALIAS, "Interface alias"},
209 { CFM_CHASSIS_ID_PORT_COMPONENT, "Port component"},
210 { CFM_CHASSIS_ID_MAC_ADDRESS, "MAC address"},
211 { CFM_CHASSIS_ID_NETWORK_ADDRESS, "Network address"},
212 { CFM_CHASSIS_ID_INTERFACE_NAME, "Interface name"},
213 { CFM_CHASSIS_ID_LOCAL, "Locally assigned"},
214 { 0, NULL}
215 };
216
217
218 static int
cfm_network_addr_print(netdissect_options * ndo,register const u_char * tptr,const u_int length)219 cfm_network_addr_print(netdissect_options *ndo,
220 register const u_char *tptr, const u_int length)
221 {
222 u_int network_addr_type;
223 u_int hexdump = FALSE;
224
225 /*
226 * Altough AFIs are tpically 2 octects wide,
227 * 802.1ab specifies that this field width
228 * is only once octet
229 */
230 if (length < 1) {
231 ND_PRINT((ndo, "\n\t Network Address Type (invalid, no data"));
232 return hexdump;
233 }
234 /* The calling function must make any due ND_TCHECK calls. */
235 network_addr_type = *tptr;
236 ND_PRINT((ndo, "\n\t Network Address Type %s (%u)",
237 tok2str(af_values, "Unknown", network_addr_type),
238 network_addr_type));
239
240 /*
241 * Resolve the passed in Address.
242 */
243 switch(network_addr_type) {
244 case AFNUM_INET:
245 if (length != 1 + 4) {
246 ND_PRINT((ndo, "(invalid IPv4 address length %u)", length - 1));
247 hexdump = TRUE;
248 break;
249 }
250 ND_PRINT((ndo, ", %s", ipaddr_string(ndo, tptr + 1)));
251 break;
252
253 case AFNUM_INET6:
254 if (length != 1 + 16) {
255 ND_PRINT((ndo, "(invalid IPv6 address length %u)", length - 1));
256 hexdump = TRUE;
257 break;
258 }
259 ND_PRINT((ndo, ", %s", ip6addr_string(ndo, tptr + 1)));
260 break;
261
262 default:
263 hexdump = TRUE;
264 break;
265 }
266
267 return hexdump;
268 }
269
270 void
cfm_print(netdissect_options * ndo,register const u_char * pptr,register u_int length)271 cfm_print(netdissect_options *ndo,
272 register const u_char *pptr, register u_int length)
273 {
274 const struct cfm_common_header_t *cfm_common_header;
275 const struct cfm_tlv_header_t *cfm_tlv_header;
276 const uint8_t *tptr, *tlv_ptr;
277 const uint8_t *namesp;
278 u_int names_data_remaining;
279 uint8_t md_nameformat, md_namelength;
280 const uint8_t *md_name;
281 uint8_t ma_nameformat, ma_namelength;
282 const uint8_t *ma_name;
283 u_int hexdump, tlen, cfm_tlv_len, cfm_tlv_type, ccm_interval;
284
285
286 union {
287 const struct cfm_ccm_t *cfm_ccm;
288 const struct cfm_lbm_t *cfm_lbm;
289 const struct cfm_ltm_t *cfm_ltm;
290 const struct cfm_ltr_t *cfm_ltr;
291 } msg_ptr;
292
293 tptr=pptr;
294 cfm_common_header = (const struct cfm_common_header_t *)pptr;
295 if (length < sizeof(*cfm_common_header))
296 goto tooshort;
297 ND_TCHECK(*cfm_common_header);
298
299 /*
300 * Sanity checking of the header.
301 */
302 if (CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version) != CFM_VERSION) {
303 ND_PRINT((ndo, "CFMv%u not supported, length %u",
304 CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version), length));
305 return;
306 }
307
308 ND_PRINT((ndo, "CFMv%u %s, MD Level %u, length %u",
309 CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version),
310 tok2str(cfm_opcode_values, "unknown (%u)", cfm_common_header->opcode),
311 CFM_EXTRACT_MD_LEVEL(cfm_common_header->mdlevel_version),
312 length));
313
314 /*
315 * In non-verbose mode just print the opcode and md-level.
316 */
317 if (ndo->ndo_vflag < 1) {
318 return;
319 }
320
321 ND_PRINT((ndo, "\n\tFirst TLV offset %u", cfm_common_header->first_tlv_offset));
322
323 tptr += sizeof(const struct cfm_common_header_t);
324 tlen = length - sizeof(struct cfm_common_header_t);
325
326 /*
327 * Sanity check the first TLV offset.
328 */
329 if (cfm_common_header->first_tlv_offset > tlen) {
330 ND_PRINT((ndo, " (too large, must be <= %u)", tlen));
331 return;
332 }
333
334 switch (cfm_common_header->opcode) {
335 case CFM_OPCODE_CCM:
336 msg_ptr.cfm_ccm = (const struct cfm_ccm_t *)tptr;
337 if (cfm_common_header->first_tlv_offset < sizeof(*msg_ptr.cfm_ccm)) {
338 ND_PRINT((ndo, " (too small 1, must be >= %lu)",
339 (unsigned long) sizeof(*msg_ptr.cfm_ccm)));
340 return;
341 }
342 if (tlen < sizeof(*msg_ptr.cfm_ccm))
343 goto tooshort;
344 ND_TCHECK(*msg_ptr.cfm_ccm);
345
346 ccm_interval = CFM_EXTRACT_CCM_INTERVAL(cfm_common_header->flags);
347 ND_PRINT((ndo, ", Flags [CCM Interval %u%s]",
348 ccm_interval,
349 cfm_common_header->flags & CFM_CCM_RDI_FLAG ?
350 ", RDI" : ""));
351
352 /*
353 * Resolve the CCM interval field.
354 */
355 if (ccm_interval) {
356 ND_PRINT((ndo, "\n\t CCM Interval %.3fs"
357 ", min CCM Lifetime %.3fs, max CCM Lifetime %.3fs",
358 ccm_interval_base[ccm_interval],
359 ccm_interval_base[ccm_interval] * CCM_INTERVAL_MIN_MULTIPLIER,
360 ccm_interval_base[ccm_interval] * CCM_INTERVAL_MAX_MULTIPLIER));
361 }
362
363 ND_PRINT((ndo, "\n\t Sequence Number 0x%08x, MA-End-Point-ID 0x%04x",
364 EXTRACT_32BITS(msg_ptr.cfm_ccm->sequence),
365 EXTRACT_16BITS(msg_ptr.cfm_ccm->ma_epi)));
366
367 namesp = msg_ptr.cfm_ccm->names;
368 names_data_remaining = sizeof(msg_ptr.cfm_ccm->names);
369
370 /*
371 * Resolve the MD fields.
372 */
373 md_nameformat = *namesp;
374 namesp++;
375 names_data_remaining--; /* We know this is != 0 */
376 if (md_nameformat != CFM_CCM_MD_FORMAT_NONE) {
377 md_namelength = *namesp;
378 namesp++;
379 names_data_remaining--; /* We know this is !=0 */
380 ND_PRINT((ndo, "\n\t MD Name Format %s (%u), MD Name length %u",
381 tok2str(cfm_md_nameformat_values, "Unknown",
382 md_nameformat),
383 md_nameformat,
384 md_namelength));
385
386 /*
387 * -3 for the MA short name format and length and one byte
388 * of MA short name.
389 */
390 if (md_namelength > names_data_remaining - 3) {
391 ND_PRINT((ndo, " (too large, must be <= %u)", names_data_remaining - 2));
392 return;
393 }
394
395 md_name = namesp;
396 ND_PRINT((ndo, "\n\t MD Name: "));
397 switch (md_nameformat) {
398 case CFM_CCM_MD_FORMAT_DNS:
399 case CFM_CCM_MD_FORMAT_CHAR:
400 safeputs(ndo, md_name, md_namelength);
401 break;
402
403 case CFM_CCM_MD_FORMAT_MAC:
404 if (md_namelength == 6) {
405 ND_PRINT((ndo, "\n\t MAC %s", etheraddr_string(ndo,
406 md_name)));
407 } else {
408 ND_PRINT((ndo, "\n\t MAC (length invalid)"));
409 }
410 break;
411
412 /* FIXME add printers for those MD formats - hexdump for now */
413 case CFM_CCM_MA_FORMAT_8021:
414 default:
415 print_unknown_data(ndo, md_name, "\n\t ",
416 md_namelength);
417 }
418 namesp += md_namelength;
419 names_data_remaining -= md_namelength;
420 } else {
421 ND_PRINT((ndo, "\n\t MD Name Format %s (%u)",
422 tok2str(cfm_md_nameformat_values, "Unknown",
423 md_nameformat),
424 md_nameformat));
425 }
426
427
428 /*
429 * Resolve the MA fields.
430 */
431 ma_nameformat = *namesp;
432 namesp++;
433 names_data_remaining--; /* We know this is != 0 */
434 ma_namelength = *namesp;
435 namesp++;
436 names_data_remaining--; /* We know this is != 0 */
437 ND_PRINT((ndo, "\n\t MA Name-Format %s (%u), MA name length %u",
438 tok2str(cfm_ma_nameformat_values, "Unknown",
439 ma_nameformat),
440 ma_nameformat,
441 ma_namelength));
442
443 if (ma_namelength > names_data_remaining) {
444 ND_PRINT((ndo, " (too large, must be <= %u)", names_data_remaining));
445 return;
446 }
447
448 ma_name = namesp;
449 ND_PRINT((ndo, "\n\t MA Name: "));
450 switch (ma_nameformat) {
451 case CFM_CCM_MA_FORMAT_CHAR:
452 safeputs(ndo, ma_name, ma_namelength);
453 break;
454
455 /* FIXME add printers for those MA formats - hexdump for now */
456 case CFM_CCM_MA_FORMAT_8021:
457 case CFM_CCM_MA_FORMAT_VID:
458 case CFM_CCM_MA_FORMAT_INT:
459 case CFM_CCM_MA_FORMAT_VPN:
460 default:
461 print_unknown_data(ndo, ma_name, "\n\t ", ma_namelength);
462 }
463 break;
464
465 case CFM_OPCODE_LTM:
466 msg_ptr.cfm_ltm = (const struct cfm_ltm_t *)tptr;
467 if (cfm_common_header->first_tlv_offset < sizeof(*msg_ptr.cfm_ltm)) {
468 ND_PRINT((ndo, " (too small 4, must be >= %lu)",
469 (unsigned long) sizeof(*msg_ptr.cfm_ltm)));
470 return;
471 }
472 if (tlen < sizeof(*msg_ptr.cfm_ltm))
473 goto tooshort;
474 ND_TCHECK(*msg_ptr.cfm_ltm);
475
476 ND_PRINT((ndo, ", Flags [%s]",
477 bittok2str(cfm_ltm_flag_values, "none", cfm_common_header->flags)));
478
479 ND_PRINT((ndo, "\n\t Transaction-ID 0x%08x, ttl %u",
480 EXTRACT_32BITS(msg_ptr.cfm_ltm->transaction_id),
481 msg_ptr.cfm_ltm->ttl));
482
483 ND_PRINT((ndo, "\n\t Original-MAC %s, Target-MAC %s",
484 etheraddr_string(ndo, msg_ptr.cfm_ltm->original_mac),
485 etheraddr_string(ndo, msg_ptr.cfm_ltm->target_mac)));
486 break;
487
488 case CFM_OPCODE_LTR:
489 msg_ptr.cfm_ltr = (const struct cfm_ltr_t *)tptr;
490 if (cfm_common_header->first_tlv_offset < sizeof(*msg_ptr.cfm_ltr)) {
491 ND_PRINT((ndo, " (too small 5, must be >= %lu)",
492 (unsigned long) sizeof(*msg_ptr.cfm_ltr)));
493 return;
494 }
495 if (tlen < sizeof(*msg_ptr.cfm_ltr))
496 goto tooshort;
497 ND_TCHECK(*msg_ptr.cfm_ltr);
498
499 ND_PRINT((ndo, ", Flags [%s]",
500 bittok2str(cfm_ltr_flag_values, "none", cfm_common_header->flags)));
501
502 ND_PRINT((ndo, "\n\t Transaction-ID 0x%08x, ttl %u",
503 EXTRACT_32BITS(msg_ptr.cfm_ltr->transaction_id),
504 msg_ptr.cfm_ltr->ttl));
505
506 ND_PRINT((ndo, "\n\t Replay-Action %s (%u)",
507 tok2str(cfm_ltr_replay_action_values,
508 "Unknown",
509 msg_ptr.cfm_ltr->replay_action),
510 msg_ptr.cfm_ltr->replay_action));
511 break;
512
513 /*
514 * No message decoder yet.
515 * Hexdump everything up until the start of the TLVs
516 */
517 case CFM_OPCODE_LBR:
518 case CFM_OPCODE_LBM:
519 default:
520 print_unknown_data(ndo, tptr, "\n\t ",
521 tlen - cfm_common_header->first_tlv_offset);
522 break;
523 }
524
525 tptr += cfm_common_header->first_tlv_offset;
526 tlen -= cfm_common_header->first_tlv_offset;
527
528 while (tlen > 0) {
529 cfm_tlv_header = (const struct cfm_tlv_header_t *)tptr;
530
531 /* Enough to read the tlv type ? */
532 ND_TCHECK2(*tptr, 1);
533 cfm_tlv_type=cfm_tlv_header->type;
534
535 ND_PRINT((ndo, "\n\t%s TLV (0x%02x)",
536 tok2str(cfm_tlv_values, "Unknown", cfm_tlv_type),
537 cfm_tlv_type));
538
539 if (cfm_tlv_type == CFM_TLV_END) {
540 /* Length is "Not present if the Type field is 0." */
541 return;
542 }
543
544 /* do we have the full tlv header ? */
545 if (tlen < sizeof(struct cfm_tlv_header_t))
546 goto tooshort;
547 ND_TCHECK2(*tptr, sizeof(struct cfm_tlv_header_t));
548 cfm_tlv_len=EXTRACT_16BITS(&cfm_tlv_header->length);
549
550 ND_PRINT((ndo, ", length %u", cfm_tlv_len));
551
552 tptr += sizeof(struct cfm_tlv_header_t);
553 tlen -= sizeof(struct cfm_tlv_header_t);
554 tlv_ptr = tptr;
555
556 /* do we have the full tlv ? */
557 if (tlen < cfm_tlv_len)
558 goto tooshort;
559 ND_TCHECK2(*tptr, cfm_tlv_len);
560 hexdump = FALSE;
561
562 switch(cfm_tlv_type) {
563 case CFM_TLV_PORT_STATUS:
564 if (cfm_tlv_len < 1) {
565 ND_PRINT((ndo, " (too short, must be >= 1)"));
566 return;
567 }
568 ND_PRINT((ndo, ", Status: %s (%u)",
569 tok2str(cfm_tlv_port_status_values, "Unknown", *tptr),
570 *tptr));
571 break;
572
573 case CFM_TLV_INTERFACE_STATUS:
574 if (cfm_tlv_len < 1) {
575 ND_PRINT((ndo, " (too short, must be >= 1)"));
576 return;
577 }
578 ND_PRINT((ndo, ", Status: %s (%u)",
579 tok2str(cfm_tlv_interface_status_values, "Unknown", *tptr),
580 *tptr));
581 break;
582
583 case CFM_TLV_PRIVATE:
584 if (cfm_tlv_len < 4) {
585 ND_PRINT((ndo, " (too short, must be >= 4)"));
586 return;
587 }
588 ND_PRINT((ndo, ", Vendor: %s (%u), Sub-Type %u",
589 tok2str(oui_values,"Unknown", EXTRACT_24BITS(tptr)),
590 EXTRACT_24BITS(tptr),
591 *(tptr + 3)));
592 hexdump = TRUE;
593 break;
594
595 case CFM_TLV_SENDER_ID:
596 {
597 u_int chassis_id_type, chassis_id_length;
598 u_int mgmt_addr_length;
599
600 if (cfm_tlv_len < 1) {
601 ND_PRINT((ndo, " (too short, must be >= 1)"));
602 goto next_tlv;
603 }
604
605 /*
606 * Get the Chassis ID length and check it.
607 * IEEE 802.1Q-2014 Section 21.5.3.1
608 */
609 chassis_id_length = *tptr;
610 tptr++;
611 tlen--;
612 cfm_tlv_len--;
613
614 if (chassis_id_length) {
615 /*
616 * IEEE 802.1Q-2014 Section 21.5.3.2: Chassis ID Subtype, references
617 * IEEE 802.1AB-2005 Section 9.5.2.2, subsequently
618 * IEEE 802.1AB-2016 Section 8.5.2.2: chassis ID subtype
619 */
620 if (cfm_tlv_len < 1) {
621 ND_PRINT((ndo, "\n\t (TLV too short)"));
622 goto next_tlv;
623 }
624 chassis_id_type = *tptr;
625 cfm_tlv_len--;
626 ND_PRINT((ndo, "\n\t Chassis-ID Type %s (%u), Chassis-ID length %u",
627 tok2str(cfm_tlv_senderid_chassisid_values,
628 "Unknown",
629 chassis_id_type),
630 chassis_id_type,
631 chassis_id_length));
632
633 if (cfm_tlv_len < chassis_id_length) {
634 ND_PRINT((ndo, "\n\t (TLV too short)"));
635 goto next_tlv;
636 }
637
638 /* IEEE 802.1Q-2014 Section 21.5.3.3: Chassis ID */
639 switch (chassis_id_type) {
640 case CFM_CHASSIS_ID_MAC_ADDRESS:
641 if (chassis_id_length != ETHER_ADDR_LEN) {
642 ND_PRINT((ndo, " (invalid MAC address length)"));
643 hexdump = TRUE;
644 break;
645 }
646 ND_PRINT((ndo, "\n\t MAC %s", etheraddr_string(ndo, tptr + 1)));
647 break;
648
649 case CFM_CHASSIS_ID_NETWORK_ADDRESS:
650 hexdump |= cfm_network_addr_print(ndo, tptr + 1, chassis_id_length);
651 break;
652
653 case CFM_CHASSIS_ID_INTERFACE_NAME: /* fall through */
654 case CFM_CHASSIS_ID_INTERFACE_ALIAS:
655 case CFM_CHASSIS_ID_LOCAL:
656 case CFM_CHASSIS_ID_CHASSIS_COMPONENT:
657 case CFM_CHASSIS_ID_PORT_COMPONENT:
658 safeputs(ndo, tptr + 1, chassis_id_length);
659 break;
660
661 default:
662 hexdump = TRUE;
663 break;
664 }
665 cfm_tlv_len -= chassis_id_length;
666
667 tptr += 1 + chassis_id_length;
668 tlen -= 1 + chassis_id_length;
669 }
670
671 /*
672 * Check if there is a Management Address.
673 * IEEE 802.1Q-2014 Section 21.5.3.4: Management Address Domain Length
674 * This and all subsequent fields are not present if the TLV length
675 * allows only the above fields.
676 */
677 if (cfm_tlv_len == 0) {
678 /* No, there isn't; we're done. */
679 break;
680 }
681
682 /* Here mgmt_addr_length stands for the management domain length. */
683 mgmt_addr_length = *tptr;
684 tptr++;
685 tlen--;
686 cfm_tlv_len--;
687 ND_PRINT((ndo, "\n\t Management Address Domain Length %u", mgmt_addr_length));
688 if (mgmt_addr_length) {
689 /* IEEE 802.1Q-2014 Section 21.5.3.5: Management Address Domain */
690 if (cfm_tlv_len < mgmt_addr_length) {
691 ND_PRINT((ndo, "\n\t (TLV too short)"));
692 goto next_tlv;
693 }
694 cfm_tlv_len -= mgmt_addr_length;
695 /*
696 * XXX - this is an OID; print it as such.
697 */
698 hex_print(ndo, "\n\t Management Address Domain: ", tptr, mgmt_addr_length);
699 tptr += mgmt_addr_length;
700 tlen -= mgmt_addr_length;
701
702 /*
703 * IEEE 802.1Q-2014 Section 21.5.3.6: Management Address Length
704 * This field is present if Management Address Domain Length is not 0.
705 */
706 if (cfm_tlv_len < 1) {
707 ND_PRINT((ndo, " (Management Address Length is missing)"));
708 hexdump = TRUE;
709 break;
710 }
711
712 /* Here mgmt_addr_length stands for the management address length. */
713 mgmt_addr_length = *tptr;
714 tptr++;
715 tlen--;
716 cfm_tlv_len--;
717 ND_PRINT((ndo, "\n\t Management Address Length %u", mgmt_addr_length));
718 if (mgmt_addr_length) {
719 /* IEEE 802.1Q-2014 Section 21.5.3.7: Management Address */
720 if (cfm_tlv_len < mgmt_addr_length) {
721 ND_PRINT((ndo, "\n\t (TLV too short)"));
722 return;
723 }
724 cfm_tlv_len -= mgmt_addr_length;
725 /*
726 * XXX - this is a TransportDomain; print it as such.
727 */
728 hex_print(ndo, "\n\t Management Address: ", tptr, mgmt_addr_length);
729 tptr += mgmt_addr_length;
730 tlen -= mgmt_addr_length;
731 }
732 }
733 break;
734 }
735
736 /*
737 * FIXME those are the defined TLVs that lack a decoder
738 * you are welcome to contribute code ;-)
739 */
740
741 case CFM_TLV_DATA:
742 case CFM_TLV_REPLY_INGRESS:
743 case CFM_TLV_REPLY_EGRESS:
744 default:
745 hexdump = TRUE;
746 break;
747 }
748 /* do we want to see an additional hexdump ? */
749 if (hexdump || ndo->ndo_vflag > 1)
750 print_unknown_data(ndo, tlv_ptr, "\n\t ", cfm_tlv_len);
751
752 next_tlv:
753 tptr+=cfm_tlv_len;
754 tlen-=cfm_tlv_len;
755 }
756 return;
757
758 tooshort:
759 ND_PRINT((ndo, "\n\t\t packet is too short"));
760 return;
761
762 trunc:
763 ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
764 }
765