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[tcpdump] / print-ldp.c
1 /*
2 * Redistribution and use in source and binary forms, with or without
3 * modification, are permitted provided that: (1) source code
4 * distributions retain the above copyright notice and this paragraph
5 * in its entirety, and (2) distributions including binary code include
6 * the above copyright notice and this paragraph in its entirety in
7 * the documentation or other materials provided with the distribution.
8 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
9 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
10 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
11 * FOR A PARTICULAR PURPOSE.
12 *
13 * Original code by Hannes Gredler (hannes@gredler.at)
14 * and Steinar Haug (sthaug@nethelp.no)
15 */
16
17 /* \summary: Label Distribution Protocol (LDP) printer */
18
19 #ifdef HAVE_CONFIG_H
20 #include <config.h>
21 #endif
22
23 #include "netdissect-stdinc.h"
24
25 #include "netdissect.h"
26 #include "extract.h"
27 #include "addrtoname.h"
28
29 #include "l2vpn.h"
30 #include "af.h"
31
32
33 /*
34 * ldp common header
35 *
36 * 0 1 2 3
37 * 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
38 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
39 * | Version | PDU Length |
40 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
41 * | LDP Identifier |
42 * + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
43 * | |
44 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
45 *
46 */
47
48 struct ldp_common_header {
49 nd_uint16_t version;
50 nd_uint16_t pdu_length;
51 nd_ipv4 lsr_id;
52 nd_uint16_t label_space;
53 };
54
55 #define LDP_VERSION 1
56
57 /*
58 * ldp message header
59 *
60 * 0 1 2 3
61 * 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
62 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
63 * |U| Message Type | Message Length |
64 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
65 * | Message ID |
66 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
67 * | |
68 * + +
69 * | Mandatory Parameters |
70 * + +
71 * | |
72 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
73 * | |
74 * + +
75 * | Optional Parameters |
76 * + +
77 * | |
78 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
79 */
80
81 struct ldp_msg_header {
82 nd_uint16_t type;
83 nd_uint16_t length;
84 nd_uint32_t id;
85 };
86
87 #define LDP_MASK_MSG_TYPE(x) ((x)&0x7fff)
88 #define LDP_MASK_U_BIT(x) ((x)&0x8000)
89
90 #define LDP_MSG_NOTIF 0x0001
91 #define LDP_MSG_HELLO 0x0100
92 #define LDP_MSG_INIT 0x0200
93 #define LDP_MSG_KEEPALIVE 0x0201
94 #define LDP_MSG_ADDRESS 0x0300
95 #define LDP_MSG_ADDRESS_WITHDRAW 0x0301
96 #define LDP_MSG_LABEL_MAPPING 0x0400
97 #define LDP_MSG_LABEL_REQUEST 0x0401
98 #define LDP_MSG_LABEL_WITHDRAW 0x0402
99 #define LDP_MSG_LABEL_RELEASE 0x0403
100 #define LDP_MSG_LABEL_ABORT_REQUEST 0x0404
101
102 #define LDP_VENDOR_PRIVATE_MIN 0x3e00
103 #define LDP_VENDOR_PRIVATE_MAX 0x3eff
104 #define LDP_EXPERIMENTAL_MIN 0x3f00
105 #define LDP_EXPERIMENTAL_MAX 0x3fff
106
107 static const struct tok ldp_msg_values[] = {
108 { LDP_MSG_NOTIF, "Notification" },
109 { LDP_MSG_HELLO, "Hello" },
110 { LDP_MSG_INIT, "Initialization" },
111 { LDP_MSG_KEEPALIVE, "Keepalive" },
112 { LDP_MSG_ADDRESS, "Address" },
113 { LDP_MSG_ADDRESS_WITHDRAW, "Address Withdraw" },
114 { LDP_MSG_LABEL_MAPPING, "Label Mapping" },
115 { LDP_MSG_LABEL_REQUEST, "Label Request" },
116 { LDP_MSG_LABEL_WITHDRAW, "Label Withdraw" },
117 { LDP_MSG_LABEL_RELEASE, "Label Release" },
118 { LDP_MSG_LABEL_ABORT_REQUEST, "Label Abort Request" },
119 { 0, NULL}
120 };
121
122 #define LDP_MASK_TLV_TYPE(x) ((x)&0x3fff)
123 #define LDP_MASK_F_BIT(x) ((x)&0x4000)
124
125 #define LDP_TLV_FEC 0x0100
126 #define LDP_TLV_ADDRESS_LIST 0x0101
127 #define LDP_TLV_ADDRESS_LIST_AFNUM_LEN 2
128 #define LDP_TLV_HOP_COUNT 0x0103
129 #define LDP_TLV_PATH_VECTOR 0x0104
130 #define LDP_TLV_GENERIC_LABEL 0x0200
131 #define LDP_TLV_ATM_LABEL 0x0201
132 #define LDP_TLV_FR_LABEL 0x0202
133 #define LDP_TLV_STATUS 0x0300
134 #define LDP_TLV_EXTD_STATUS 0x0301
135 #define LDP_TLV_RETURNED_PDU 0x0302
136 #define LDP_TLV_RETURNED_MSG 0x0303
137 #define LDP_TLV_COMMON_HELLO 0x0400
138 #define LDP_TLV_IPV4_TRANSPORT_ADDR 0x0401
139 #define LDP_TLV_CONFIG_SEQ_NUMBER 0x0402
140 #define LDP_TLV_IPV6_TRANSPORT_ADDR 0x0403
141 #define LDP_TLV_COMMON_SESSION 0x0500
142 #define LDP_TLV_ATM_SESSION_PARM 0x0501
143 #define LDP_TLV_FR_SESSION_PARM 0x0502
144 #define LDP_TLV_FT_SESSION 0x0503
145 #define LDP_TLV_LABEL_REQUEST_MSG_ID 0x0600
146 #define LDP_TLV_MTU 0x0601 /* rfc 3988 */
147
148 static const struct tok ldp_tlv_values[] = {
149 { LDP_TLV_FEC, "FEC" },
150 { LDP_TLV_ADDRESS_LIST, "Address List" },
151 { LDP_TLV_HOP_COUNT, "Hop Count" },
152 { LDP_TLV_PATH_VECTOR, "Path Vector" },
153 { LDP_TLV_GENERIC_LABEL, "Generic Label" },
154 { LDP_TLV_ATM_LABEL, "ATM Label" },
155 { LDP_TLV_FR_LABEL, "Frame-Relay Label" },
156 { LDP_TLV_STATUS, "Status" },
157 { LDP_TLV_EXTD_STATUS, "Extended Status" },
158 { LDP_TLV_RETURNED_PDU, "Returned PDU" },
159 { LDP_TLV_RETURNED_MSG, "Returned Message" },
160 { LDP_TLV_COMMON_HELLO, "Common Hello Parameters" },
161 { LDP_TLV_IPV4_TRANSPORT_ADDR, "IPv4 Transport Address" },
162 { LDP_TLV_CONFIG_SEQ_NUMBER, "Configuration Sequence Number" },
163 { LDP_TLV_IPV6_TRANSPORT_ADDR, "IPv6 Transport Address" },
164 { LDP_TLV_COMMON_SESSION, "Common Session Parameters" },
165 { LDP_TLV_ATM_SESSION_PARM, "ATM Session Parameters" },
166 { LDP_TLV_FR_SESSION_PARM, "Frame-Relay Session Parameters" },
167 { LDP_TLV_FT_SESSION, "Fault-Tolerant Session Parameters" },
168 { LDP_TLV_LABEL_REQUEST_MSG_ID, "Label Request Message ID" },
169 { LDP_TLV_MTU, "MTU" },
170 { 0, NULL}
171 };
172
173 #define LDP_FEC_WILDCARD 0x01
174 #define LDP_FEC_PREFIX 0x02
175 #define LDP_FEC_HOSTADDRESS 0x03
176 /* From RFC 4906; should probably be updated to RFC 4447 (e.g., VC -> PW) */
177 #define LDP_FEC_MARTINI_VC 0x80
178
179 static const struct tok ldp_fec_values[] = {
180 { LDP_FEC_WILDCARD, "Wildcard" },
181 { LDP_FEC_PREFIX, "Prefix" },
182 { LDP_FEC_HOSTADDRESS, "Host address" },
183 { LDP_FEC_MARTINI_VC, "Martini VC" },
184 { 0, NULL}
185 };
186
187 #define LDP_FEC_MARTINI_IFPARM_MTU 0x01
188 #define LDP_FEC_MARTINI_IFPARM_DESC 0x03
189 #define LDP_FEC_MARTINI_IFPARM_VCCV 0x0c
190
191 static const struct tok ldp_fec_martini_ifparm_values[] = {
192 { LDP_FEC_MARTINI_IFPARM_MTU, "MTU" },
193 { LDP_FEC_MARTINI_IFPARM_DESC, "Description" },
194 { LDP_FEC_MARTINI_IFPARM_VCCV, "VCCV" },
195 { 0, NULL}
196 };
197
198 /* draft-ietf-pwe3-vccv-04.txt */
199 static const struct tok ldp_fec_martini_ifparm_vccv_cc_values[] = {
200 { 0x01, "PWE3 control word" },
201 { 0x02, "MPLS Router Alert Label" },
202 { 0x04, "MPLS inner label TTL = 1" },
203 { 0, NULL}
204 };
205
206 /* draft-ietf-pwe3-vccv-04.txt */
207 static const struct tok ldp_fec_martini_ifparm_vccv_cv_values[] = {
208 { 0x01, "ICMP Ping" },
209 { 0x02, "LSP Ping" },
210 { 0x04, "BFD" },
211 { 0, NULL}
212 };
213
214 static u_int ldp_pdu_print(netdissect_options *, const u_char *);
215
216 /*
217 * ldp tlv header
218 *
219 * 0 1 2 3
220 * 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
221 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
222 * |U|F| Type | Length |
223 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
224 * | |
225 * | Value |
226 * ~ ~
227 * | |
228 * | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
229 * | |
230 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
231 */
232
233 #define TLV_TCHECK(minlen) \
234 if (tlv_tlen < minlen) { \
235 ND_PRINT(" [tlv length %u < %u]", tlv_tlen, minlen); \
236 nd_print_invalid(ndo); \
237 goto invalid; \
238 }
239
240 static u_int
241 ldp_tlv_print(netdissect_options *ndo,
242 const u_char *tptr,
243 u_int msg_tlen)
244 {
245 struct ldp_tlv_header {
246 nd_uint16_t type;
247 nd_uint16_t length;
248 };
249
250 const struct ldp_tlv_header *ldp_tlv_header;
251 u_short tlv_type,tlv_len,tlv_tlen,af,ft_flags;
252 u_char fec_type;
253 u_int ui,vc_info_len, vc_info_tlv_type, vc_info_tlv_len,idx;
254 char buf[100];
255 int i;
256
257 ldp_tlv_header = (const struct ldp_tlv_header *)tptr;
258 ND_TCHECK_SIZE(ldp_tlv_header);
259 tlv_len=GET_BE_U_2(ldp_tlv_header->length);
260 if (tlv_len + 4U > msg_tlen) {
261 ND_PRINT("\n\t\t TLV contents go past end of message");
262 return 0;
263 }
264 tlv_tlen=tlv_len;
265 tlv_type=LDP_MASK_TLV_TYPE(GET_BE_U_2(ldp_tlv_header->type));
266
267 /* FIXME vendor private / experimental check */
268 ND_PRINT("\n\t %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]",
269 tok2str(ldp_tlv_values,
270 "Unknown",
271 tlv_type),
272 tlv_type,
273 tlv_len,
274 LDP_MASK_U_BIT(GET_BE_U_2(ldp_tlv_header->type)) ? "continue processing" : "ignore",
275 LDP_MASK_F_BIT(GET_BE_U_2(ldp_tlv_header->type)) ? "do" : "don't");
276
277 tptr+=sizeof(struct ldp_tlv_header);
278
279 switch(tlv_type) {
280
281 case LDP_TLV_COMMON_HELLO:
282 TLV_TCHECK(4);
283 ND_PRINT("\n\t Hold Time: %us, Flags: [%s Hello%s]",
284 GET_BE_U_2(tptr),
285 (GET_BE_U_2(tptr + 2)&0x8000) ? "Targeted" : "Link",
286 (GET_BE_U_2(tptr + 2)&0x4000) ? ", Request for targeted Hellos" : "");
287 break;
288
289 case LDP_TLV_IPV4_TRANSPORT_ADDR:
290 TLV_TCHECK(4);
291 ND_PRINT("\n\t IPv4 Transport Address: %s", GET_IPADDR_STRING(tptr));
292 break;
293 case LDP_TLV_IPV6_TRANSPORT_ADDR:
294 TLV_TCHECK(16);
295 ND_PRINT("\n\t IPv6 Transport Address: %s", GET_IP6ADDR_STRING(tptr));
296 break;
297 case LDP_TLV_CONFIG_SEQ_NUMBER:
298 TLV_TCHECK(4);
299 ND_PRINT("\n\t Sequence Number: %u", GET_BE_U_4(tptr));
300 break;
301
302 case LDP_TLV_ADDRESS_LIST:
303 TLV_TCHECK(LDP_TLV_ADDRESS_LIST_AFNUM_LEN);
304 af = GET_BE_U_2(tptr);
305 tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
306 tlv_tlen -= LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
307 ND_PRINT("\n\t Address Family: %s, addresses",
308 tok2str(af_values, "Unknown (%u)", af));
309 switch (af) {
310 case AFNUM_INET:
311 while(tlv_tlen >= sizeof(nd_ipv4)) {
312 ND_TCHECK_LEN(tptr, sizeof(nd_ipv4));
313 ND_PRINT(" %s", GET_IPADDR_STRING(tptr));
314 tlv_tlen-=sizeof(nd_ipv4);
315 tptr+=sizeof(nd_ipv4);
316 }
317 break;
318 case AFNUM_INET6:
319 while(tlv_tlen >= sizeof(nd_ipv6)) {
320 ND_PRINT(" %s", GET_IP6ADDR_STRING(tptr));
321 tlv_tlen-=sizeof(nd_ipv6);
322 tptr+=sizeof(nd_ipv6);
323 }
324 break;
325 default:
326 /* unknown AF */
327 break;
328 }
329 break;
330
331 case LDP_TLV_COMMON_SESSION:
332 TLV_TCHECK(8);
333 ND_PRINT("\n\t Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
334 GET_BE_U_2(tptr), GET_BE_U_2(tptr + 2),
335 (GET_BE_U_2(tptr + 6)&0x8000) ? "On Demand" : "Unsolicited",
336 (GET_BE_U_2(tptr + 6)&0x4000) ? "Enabled" : "Disabled"
337 );
338 break;
339
340 case LDP_TLV_FEC:
341 TLV_TCHECK(1);
342 fec_type = GET_U_1(tptr);
343 ND_PRINT("\n\t %s FEC (0x%02x)",
344 tok2str(ldp_fec_values, "Unknown", fec_type),
345 fec_type);
346
347 tptr+=1;
348 tlv_tlen-=1;
349 switch(fec_type) {
350
351 case LDP_FEC_WILDCARD:
352 break;
353 case LDP_FEC_PREFIX:
354 TLV_TCHECK(2);
355 af = GET_BE_U_2(tptr);
356 tptr+=2;
357 tlv_tlen-=2;
358 if (af == AFNUM_INET) {
359 i=decode_prefix4(ndo, tptr, tlv_tlen, buf, sizeof(buf));
360 if (i == -2)
361 goto trunc;
362 if (i == -3)
363 ND_PRINT(": IPv4 prefix (goes past end of TLV)");
364 else if (i == -1)
365 ND_PRINT(": IPv4 prefix (invalid length)");
366 else
367 ND_PRINT(": IPv4 prefix %s", buf);
368 }
369 else if (af == AFNUM_INET6) {
370 i=decode_prefix6(ndo, tptr, tlv_tlen, buf, sizeof(buf));
371 if (i == -2)
372 goto trunc;
373 if (i == -3)
374 ND_PRINT(": IPv4 prefix (goes past end of TLV)");
375 else if (i == -1)
376 ND_PRINT(": IPv6 prefix (invalid length)");
377 else
378 ND_PRINT(": IPv6 prefix %s", buf);
379 }
380 else
381 ND_PRINT(": Address family %u prefix", af);
382 break;
383 case LDP_FEC_HOSTADDRESS:
384 break;
385 case LDP_FEC_MARTINI_VC:
386 /*
387 * We assume the type was supposed to be one of the MPLS
388 * Pseudowire Types.
389 */
390 TLV_TCHECK(7);
391 vc_info_len = GET_U_1(tptr + 2);
392
393 /*
394 * According to RFC 4908, the VC info Length field can be zero,
395 * in which case not only are there no interface parameters,
396 * there's no VC ID.
397 */
398 if (vc_info_len == 0) {
399 ND_PRINT(": %s, %scontrol word, group-ID %u, VC-info-length: %u",
400 tok2str(mpls_pw_types_values, "Unknown", GET_BE_U_2(tptr)&0x7fff),
401 GET_BE_U_2(tptr)&0x8000 ? "" : "no ",
402 GET_BE_U_4(tptr + 3),
403 vc_info_len);
404 break;
405 }
406
407 /* Make sure we have the VC ID as well */
408 TLV_TCHECK(11);
409 ND_PRINT(": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
410 tok2str(mpls_pw_types_values, "Unknown", GET_BE_U_2(tptr)&0x7fff),
411 GET_BE_U_2(tptr)&0x8000 ? "" : "no ",
412 GET_BE_U_4(tptr + 3),
413 GET_BE_U_4(tptr + 7),
414 vc_info_len);
415 if (vc_info_len < 4) {
416 /* minimum 4, for the VC ID */
417 ND_PRINT(" (invalid, < 4");
418 return(tlv_len+4); /* Type & Length fields not included */
419 }
420 vc_info_len -= 4; /* subtract out the VC ID, giving the length of the interface parameters */
421
422 /* Skip past the fixed information and the VC ID */
423 tptr+=11;
424 tlv_tlen-=11;
425 TLV_TCHECK(vc_info_len);
426
427 while (vc_info_len > 2) {
428 vc_info_tlv_type = GET_U_1(tptr);
429 vc_info_tlv_len = GET_U_1(tptr + 1);
430 if (vc_info_tlv_len < 2)
431 break;
432 if (vc_info_len < vc_info_tlv_len)
433 break;
434
435 ND_PRINT("\n\t\tInterface Parameter: %s (0x%02x), len %u",
436 tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
437 vc_info_tlv_type,
438 vc_info_tlv_len);
439
440 switch(vc_info_tlv_type) {
441 case LDP_FEC_MARTINI_IFPARM_MTU:
442 ND_PRINT(": %u", GET_BE_U_2(tptr + 2));
443 break;
444
445 case LDP_FEC_MARTINI_IFPARM_DESC:
446 ND_PRINT(": ");
447 for (idx = 2; idx < vc_info_tlv_len; idx++)
448 fn_print_char(ndo, GET_U_1(tptr + idx));
449 break;
450
451 case LDP_FEC_MARTINI_IFPARM_VCCV:
452 ND_PRINT("\n\t\t Control Channels (0x%02x) = [%s]",
453 GET_U_1((tptr + 2)),
454 bittok2str(ldp_fec_martini_ifparm_vccv_cc_values, "none", GET_U_1((tptr + 2))));
455 ND_PRINT("\n\t\t CV Types (0x%02x) = [%s]",
456 GET_U_1((tptr + 3)),
457 bittok2str(ldp_fec_martini_ifparm_vccv_cv_values, "none", GET_U_1((tptr + 3))));
458 break;
459
460 default:
461 print_unknown_data(ndo, tptr+2, "\n\t\t ", vc_info_tlv_len-2);
462 break;
463 }
464
465 vc_info_len -= vc_info_tlv_len;
466 tptr += vc_info_tlv_len;
467 }
468 break;
469 }
470
471 break;
472
473 case LDP_TLV_GENERIC_LABEL:
474 TLV_TCHECK(4);
475 ND_PRINT("\n\t Label: %u", GET_BE_U_4(tptr) & 0xfffff);
476 break;
477
478 case LDP_TLV_STATUS:
479 TLV_TCHECK(8);
480 ui = GET_BE_U_4(tptr);
481 tptr+=4;
482 ND_PRINT("\n\t Status: 0x%02x, Flags: [%s and %s forward]",
483 ui&0x3fffffff,
484 ui&0x80000000 ? "Fatal error" : "Advisory Notification",
485 ui&0x40000000 ? "do" : "don't");
486 ui = GET_BE_U_4(tptr);
487 tptr+=4;
488 if (ui)
489 ND_PRINT(", causing Message ID: 0x%08x", ui);
490 break;
491
492 case LDP_TLV_FT_SESSION:
493 TLV_TCHECK(12);
494 ft_flags = GET_BE_U_2(tptr);
495 ND_PRINT("\n\t Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
496 ft_flags&0x8000 ? "" : "No ",
497 ft_flags&0x8 ? "" : "Don't ",
498 ft_flags&0x4 ? "" : "No ",
499 ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels",
500 ft_flags&0x1 ? "" : "Don't ");
501 /* 16 bits (FT Flags) + 16 bits (Reserved) */
502 tptr+=4;
503 ui = GET_BE_U_4(tptr);
504 if (ui)
505 ND_PRINT(", Reconnect Timeout: %ums", ui);
506 tptr+=4;
507 ui = GET_BE_U_4(tptr);
508 if (ui)
509 ND_PRINT(", Recovery Time: %ums", ui);
510 break;
511
512 case LDP_TLV_MTU:
513 TLV_TCHECK(2);
514 ND_PRINT("\n\t MTU: %u", GET_BE_U_2(tptr));
515 break;
516
517
518 /*
519 * FIXME those are the defined TLVs that lack a decoder
520 * you are welcome to contribute code ;-)
521 */
522
523 case LDP_TLV_HOP_COUNT:
524 case LDP_TLV_PATH_VECTOR:
525 case LDP_TLV_ATM_LABEL:
526 case LDP_TLV_FR_LABEL:
527 case LDP_TLV_EXTD_STATUS:
528 case LDP_TLV_RETURNED_PDU:
529 case LDP_TLV_RETURNED_MSG:
530 case LDP_TLV_ATM_SESSION_PARM:
531 case LDP_TLV_FR_SESSION_PARM:
532 case LDP_TLV_LABEL_REQUEST_MSG_ID:
533
534 default:
535 if (ndo->ndo_vflag <= 1)
536 print_unknown_data(ndo, tptr, "\n\t ", tlv_tlen);
537 break;
538 }
539 return(tlv_len+4); /* Type & Length fields not included */
540
541 trunc:
542 nd_print_trunc(ndo);
543 return 0;
544
545 invalid:
546 return(tlv_len+4); /* Type & Length fields not included */
547 }
548
549 void
550 ldp_print(netdissect_options *ndo,
551 const u_char *pptr, u_int len)
552 {
553 u_int processed;
554
555 ndo->ndo_protocol = "ldp";
556 while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
557 processed = ldp_pdu_print(ndo, pptr);
558 if (processed == 0)
559 return;
560 if (len < processed) {
561 ND_PRINT(" [remaining length %u < %u]", len, processed);
562 nd_print_invalid(ndo);
563 break;
564 }
565 len -= processed;
566 pptr += processed;
567 }
568 }
569
570 static u_int
571 ldp_pdu_print(netdissect_options *ndo,
572 const u_char *pptr)
573 {
574 const struct ldp_common_header *ldp_com_header;
575 const struct ldp_msg_header *ldp_msg_header;
576 const u_char *tptr,*msg_tptr;
577 u_short tlen;
578 u_short pdu_len,msg_len,msg_type;
579 u_int msg_tlen;
580 int hexdump,processed;
581
582 ldp_com_header = (const struct ldp_common_header *)pptr;
583 ND_TCHECK_SIZE(ldp_com_header);
584
585 /*
586 * Sanity checking of the header.
587 */
588 if (GET_BE_U_2(ldp_com_header->version) != LDP_VERSION) {
589 ND_PRINT("%sLDP version %u packet not supported",
590 (ndo->ndo_vflag < 1) ? "" : "\n\t",
591 GET_BE_U_2(ldp_com_header->version));
592 return 0;
593 }
594
595 pdu_len = GET_BE_U_2(ldp_com_header->pdu_length);
596 if (pdu_len < sizeof(struct ldp_common_header)-4) {
597 /* length too short */
598 ND_PRINT("%sLDP, pdu-length: %u (too short, < %u)",
599 (ndo->ndo_vflag < 1) ? "" : "\n\t",
600 pdu_len,
601 (u_int)(sizeof(struct ldp_common_header)-4));
602 return 0;
603 }
604
605 /* print the LSR-ID, label-space & length */
606 ND_PRINT("%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
607 (ndo->ndo_vflag < 1) ? "" : "\n\t",
608 GET_IPADDR_STRING(ldp_com_header->lsr_id),
609 GET_BE_U_2(ldp_com_header->label_space),
610 pdu_len);
611
612 /* bail out if non-verbose */
613 if (ndo->ndo_vflag < 1)
614 return 0;
615
616 /* ok they seem to want to know everything - lets fully decode it */
617 tptr = pptr + sizeof(struct ldp_common_header);
618 tlen = pdu_len - (sizeof(struct ldp_common_header)-4); /* Type & Length fields not included */
619
620 while(tlen>0) {
621 /* did we capture enough for fully decoding the msg header ? */
622 ND_TCHECK_LEN(tptr, sizeof(struct ldp_msg_header));
623
624 ldp_msg_header = (const struct ldp_msg_header *)tptr;
625 msg_len=GET_BE_U_2(ldp_msg_header->length);
626 msg_type=LDP_MASK_MSG_TYPE(GET_BE_U_2(ldp_msg_header->type));
627
628 if (msg_len < sizeof(struct ldp_msg_header)-4) {
629 /* length too short */
630 /* FIXME vendor private / experimental check */
631 ND_PRINT("\n\t %s Message (0x%04x), length: %u (too short, < %u)",
632 tok2str(ldp_msg_values,
633 "Unknown",
634 msg_type),
635 msg_type,
636 msg_len,
637 (u_int)(sizeof(struct ldp_msg_header)-4));
638 return 0;
639 }
640
641 /* FIXME vendor private / experimental check */
642 ND_PRINT("\n\t %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
643 tok2str(ldp_msg_values,
644 "Unknown",
645 msg_type),
646 msg_type,
647 msg_len,
648 GET_BE_U_4(ldp_msg_header->id),
649 LDP_MASK_U_BIT(GET_BE_U_2(ldp_msg_header->type)) ? "continue processing" : "ignore");
650
651 msg_tptr=tptr+sizeof(struct ldp_msg_header);
652 msg_tlen=msg_len-(sizeof(struct ldp_msg_header)-4); /* Type & Length fields not included */
653
654 /* did we capture enough for fully decoding the message ? */
655 ND_TCHECK_LEN(tptr, msg_len);
656 hexdump=FALSE;
657
658 switch(msg_type) {
659
660 case LDP_MSG_NOTIF:
661 case LDP_MSG_HELLO:
662 case LDP_MSG_INIT:
663 case LDP_MSG_KEEPALIVE:
664 case LDP_MSG_ADDRESS:
665 case LDP_MSG_LABEL_MAPPING:
666 case LDP_MSG_ADDRESS_WITHDRAW:
667 case LDP_MSG_LABEL_WITHDRAW:
668 while(msg_tlen >= 4) {
669 processed = ldp_tlv_print(ndo, msg_tptr, msg_tlen);
670 if (processed == 0)
671 break;
672 msg_tlen-=processed;
673 msg_tptr+=processed;
674 }
675 break;
676
677 /*
678 * FIXME those are the defined messages that lack a decoder
679 * you are welcome to contribute code ;-)
680 */
681
682 case LDP_MSG_LABEL_REQUEST:
683 case LDP_MSG_LABEL_RELEASE:
684 case LDP_MSG_LABEL_ABORT_REQUEST:
685
686 default:
687 if (ndo->ndo_vflag <= 1)
688 print_unknown_data(ndo, msg_tptr, "\n\t ", msg_tlen);
689 break;
690 }
691 /* do we want to see an additionally hexdump ? */
692 if (ndo->ndo_vflag > 1 || hexdump==TRUE)
693 print_unknown_data(ndo, tptr+sizeof(struct ldp_msg_header), "\n\t ",
694 msg_len);
695
696 tptr += msg_len+4;
697 tlen -= msg_len+4;
698 }
699 return pdu_len+4;
700 trunc:
701 nd_print_trunc(ndo);
702 return 0;
703 }
[mirror] the TCPdump network dissector