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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_PRINT(" %s", GET_IPADDR_STRING(tptr));
313 tlv_tlen-=sizeof(nd_ipv4);
314 tptr+=sizeof(nd_ipv4);
315 }
316 break;
317 case AFNUM_INET6:
318 while(tlv_tlen >= sizeof(nd_ipv6)) {
319 ND_PRINT(" %s", GET_IP6ADDR_STRING(tptr));
320 tlv_tlen-=sizeof(nd_ipv6);
321 tptr+=sizeof(nd_ipv6);
322 }
323 break;
324 default:
325 /* unknown AF */
326 break;
327 }
328 break;
329
330 case LDP_TLV_COMMON_SESSION:
331 TLV_TCHECK(8);
332 ND_PRINT("\n\t Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
333 GET_BE_U_2(tptr), GET_BE_U_2(tptr + 2),
334 (GET_BE_U_2(tptr + 6)&0x8000) ? "On Demand" : "Unsolicited",
335 (GET_BE_U_2(tptr + 6)&0x4000) ? "Enabled" : "Disabled"
336 );
337 break;
338
339 case LDP_TLV_FEC:
340 TLV_TCHECK(1);
341 fec_type = GET_U_1(tptr);
342 ND_PRINT("\n\t %s FEC (0x%02x)",
343 tok2str(ldp_fec_values, "Unknown", fec_type),
344 fec_type);
345
346 tptr+=1;
347 tlv_tlen-=1;
348 switch(fec_type) {
349
350 case LDP_FEC_WILDCARD:
351 break;
352 case LDP_FEC_PREFIX:
353 TLV_TCHECK(2);
354 af = GET_BE_U_2(tptr);
355 tptr+=2;
356 tlv_tlen-=2;
357 if (af == AFNUM_INET) {
358 i=decode_prefix4(ndo, tptr, tlv_tlen, buf, sizeof(buf));
359 if (i == -2)
360 goto trunc;
361 if (i == -3)
362 ND_PRINT(": IPv4 prefix (goes past end of TLV)");
363 else if (i == -1)
364 ND_PRINT(": IPv4 prefix (invalid length)");
365 else
366 ND_PRINT(": IPv4 prefix %s", buf);
367 }
368 else if (af == AFNUM_INET6) {
369 i=decode_prefix6(ndo, tptr, tlv_tlen, buf, sizeof(buf));
370 if (i == -2)
371 goto trunc;
372 if (i == -3)
373 ND_PRINT(": IPv4 prefix (goes past end of TLV)");
374 else if (i == -1)
375 ND_PRINT(": IPv6 prefix (invalid length)");
376 else
377 ND_PRINT(": IPv6 prefix %s", buf);
378 }
379 else
380 ND_PRINT(": Address family %u prefix", af);
381 break;
382 case LDP_FEC_HOSTADDRESS:
383 break;
384 case LDP_FEC_MARTINI_VC:
385 /*
386 * We assume the type was supposed to be one of the MPLS
387 * Pseudowire Types.
388 */
389 TLV_TCHECK(7);
390 vc_info_len = GET_U_1(tptr + 2);
391
392 /*
393 * According to RFC 4908, the VC info Length field can be zero,
394 * in which case not only are there no interface parameters,
395 * there's no VC ID.
396 */
397 if (vc_info_len == 0) {
398 ND_PRINT(": %s, %scontrol word, group-ID %u, VC-info-length: %u",
399 tok2str(mpls_pw_types_values, "Unknown", GET_BE_U_2(tptr)&0x7fff),
400 GET_BE_U_2(tptr)&0x8000 ? "" : "no ",
401 GET_BE_U_4(tptr + 3),
402 vc_info_len);
403 break;
404 }
405
406 /* Make sure we have the VC ID as well */
407 TLV_TCHECK(11);
408 ND_PRINT(": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
409 tok2str(mpls_pw_types_values, "Unknown", GET_BE_U_2(tptr)&0x7fff),
410 GET_BE_U_2(tptr)&0x8000 ? "" : "no ",
411 GET_BE_U_4(tptr + 3),
412 GET_BE_U_4(tptr + 7),
413 vc_info_len);
414 if (vc_info_len < 4) {
415 /* minimum 4, for the VC ID */
416 ND_PRINT(" (invalid, < 4");
417 return(tlv_len+4); /* Type & Length fields not included */
418 }
419 vc_info_len -= 4; /* subtract out the VC ID, giving the length of the interface parameters */
420
421 /* Skip past the fixed information and the VC ID */
422 tptr+=11;
423 tlv_tlen-=11;
424 TLV_TCHECK(vc_info_len);
425
426 while (vc_info_len > 2) {
427 vc_info_tlv_type = GET_U_1(tptr);
428 vc_info_tlv_len = GET_U_1(tptr + 1);
429 if (vc_info_tlv_len < 2)
430 break;
431 if (vc_info_len < vc_info_tlv_len)
432 break;
433
434 ND_PRINT("\n\t\tInterface Parameter: %s (0x%02x), len %u",
435 tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
436 vc_info_tlv_type,
437 vc_info_tlv_len);
438
439 switch(vc_info_tlv_type) {
440 case LDP_FEC_MARTINI_IFPARM_MTU:
441 ND_PRINT(": %u", GET_BE_U_2(tptr + 2));
442 break;
443
444 case LDP_FEC_MARTINI_IFPARM_DESC:
445 ND_PRINT(": ");
446 for (idx = 2; idx < vc_info_tlv_len; idx++)
447 fn_print_char(ndo, GET_U_1(tptr + idx));
448 break;
449
450 case LDP_FEC_MARTINI_IFPARM_VCCV:
451 ND_PRINT("\n\t\t Control Channels (0x%02x) = [%s]",
452 GET_U_1((tptr + 2)),
453 bittok2str(ldp_fec_martini_ifparm_vccv_cc_values, "none", GET_U_1((tptr + 2))));
454 ND_PRINT("\n\t\t CV Types (0x%02x) = [%s]",
455 GET_U_1((tptr + 3)),
456 bittok2str(ldp_fec_martini_ifparm_vccv_cv_values, "none", GET_U_1((tptr + 3))));
457 break;
458
459 default:
460 print_unknown_data(ndo, tptr+2, "\n\t\t ", vc_info_tlv_len-2);
461 break;
462 }
463
464 vc_info_len -= vc_info_tlv_len;
465 tptr += vc_info_tlv_len;
466 }
467 break;
468 }
469
470 break;
471
472 case LDP_TLV_GENERIC_LABEL:
473 TLV_TCHECK(4);
474 ND_PRINT("\n\t Label: %u", GET_BE_U_4(tptr) & 0xfffff);
475 break;
476
477 case LDP_TLV_STATUS:
478 TLV_TCHECK(8);
479 ui = GET_BE_U_4(tptr);
480 tptr+=4;
481 ND_PRINT("\n\t Status: 0x%02x, Flags: [%s and %s forward]",
482 ui&0x3fffffff,
483 ui&0x80000000 ? "Fatal error" : "Advisory Notification",
484 ui&0x40000000 ? "do" : "don't");
485 ui = GET_BE_U_4(tptr);
486 tptr+=4;
487 if (ui)
488 ND_PRINT(", causing Message ID: 0x%08x", ui);
489 break;
490
491 case LDP_TLV_FT_SESSION:
492 TLV_TCHECK(12);
493 ft_flags = GET_BE_U_2(tptr);
494 ND_PRINT("\n\t Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
495 ft_flags&0x8000 ? "" : "No ",
496 ft_flags&0x8 ? "" : "Don't ",
497 ft_flags&0x4 ? "" : "No ",
498 ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels",
499 ft_flags&0x1 ? "" : "Don't ");
500 /* 16 bits (FT Flags) + 16 bits (Reserved) */
501 tptr+=4;
502 ui = GET_BE_U_4(tptr);
503 if (ui)
504 ND_PRINT(", Reconnect Timeout: %ums", ui);
505 tptr+=4;
506 ui = GET_BE_U_4(tptr);
507 if (ui)
508 ND_PRINT(", Recovery Time: %ums", ui);
509 break;
510
511 case LDP_TLV_MTU:
512 TLV_TCHECK(2);
513 ND_PRINT("\n\t MTU: %u", GET_BE_U_2(tptr));
514 break;
515
516
517 /*
518 * FIXME those are the defined TLVs that lack a decoder
519 * you are welcome to contribute code ;-)
520 */
521
522 case LDP_TLV_HOP_COUNT:
523 case LDP_TLV_PATH_VECTOR:
524 case LDP_TLV_ATM_LABEL:
525 case LDP_TLV_FR_LABEL:
526 case LDP_TLV_EXTD_STATUS:
527 case LDP_TLV_RETURNED_PDU:
528 case LDP_TLV_RETURNED_MSG:
529 case LDP_TLV_ATM_SESSION_PARM:
530 case LDP_TLV_FR_SESSION_PARM:
531 case LDP_TLV_LABEL_REQUEST_MSG_ID:
532
533 default:
534 if (ndo->ndo_vflag <= 1)
535 print_unknown_data(ndo, tptr, "\n\t ", tlv_tlen);
536 break;
537 }
538 return(tlv_len+4); /* Type & Length fields not included */
539
540 trunc:
541 nd_trunc_longjmp(ndo);
542
543 invalid:
544 return(tlv_len+4); /* Type & Length fields not included */
545 }
546
547 void
548 ldp_print(netdissect_options *ndo,
549 const u_char *pptr, u_int len)
550 {
551 u_int processed;
552
553 ndo->ndo_protocol = "ldp";
554 while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
555 processed = ldp_pdu_print(ndo, pptr);
556 if (processed == 0)
557 return;
558 if (len < processed) {
559 ND_PRINT(" [remaining length %u < %u]", len, processed);
560 nd_print_invalid(ndo);
561 break;
562 }
563 len -= processed;
564 pptr += processed;
565 }
566 }
567
568 static u_int
569 ldp_pdu_print(netdissect_options *ndo,
570 const u_char *pptr)
571 {
572 const struct ldp_common_header *ldp_com_header;
573 const struct ldp_msg_header *ldp_msg_header;
574 const u_char *tptr,*msg_tptr;
575 u_short tlen;
576 u_short pdu_len,msg_len,msg_type;
577 u_int msg_tlen;
578 int hexdump,processed;
579
580 ldp_com_header = (const struct ldp_common_header *)pptr;
581 ND_TCHECK_SIZE(ldp_com_header);
582
583 /*
584 * Sanity checking of the header.
585 */
586 if (GET_BE_U_2(ldp_com_header->version) != LDP_VERSION) {
587 ND_PRINT("%sLDP version %u packet not supported",
588 (ndo->ndo_vflag < 1) ? "" : "\n\t",
589 GET_BE_U_2(ldp_com_header->version));
590 return 0;
591 }
592
593 pdu_len = GET_BE_U_2(ldp_com_header->pdu_length);
594 if (pdu_len < sizeof(struct ldp_common_header)-4) {
595 /* length too short */
596 ND_PRINT("%sLDP, pdu-length: %u (too short, < %u)",
597 (ndo->ndo_vflag < 1) ? "" : "\n\t",
598 pdu_len,
599 (u_int)(sizeof(struct ldp_common_header)-4));
600 return 0;
601 }
602
603 /* print the LSR-ID, label-space & length */
604 ND_PRINT("%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
605 (ndo->ndo_vflag < 1) ? "" : "\n\t",
606 GET_IPADDR_STRING(ldp_com_header->lsr_id),
607 GET_BE_U_2(ldp_com_header->label_space),
608 pdu_len);
609
610 /* bail out if non-verbose */
611 if (ndo->ndo_vflag < 1)
612 return 0;
613
614 /* ok they seem to want to know everything - lets fully decode it */
615 tptr = pptr + sizeof(struct ldp_common_header);
616 tlen = pdu_len - (sizeof(struct ldp_common_header)-4); /* Type & Length fields not included */
617
618 while(tlen>0) {
619 /* did we capture enough for fully decoding the msg header ? */
620 ND_TCHECK_LEN(tptr, sizeof(struct ldp_msg_header));
621
622 ldp_msg_header = (const struct ldp_msg_header *)tptr;
623 msg_len=GET_BE_U_2(ldp_msg_header->length);
624 msg_type=LDP_MASK_MSG_TYPE(GET_BE_U_2(ldp_msg_header->type));
625
626 if (msg_len < sizeof(struct ldp_msg_header)-4) {
627 /* length too short */
628 /* FIXME vendor private / experimental check */
629 ND_PRINT("\n\t %s Message (0x%04x), length: %u (too short, < %u)",
630 tok2str(ldp_msg_values,
631 "Unknown",
632 msg_type),
633 msg_type,
634 msg_len,
635 (u_int)(sizeof(struct ldp_msg_header)-4));
636 return 0;
637 }
638
639 /* FIXME vendor private / experimental check */
640 ND_PRINT("\n\t %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
641 tok2str(ldp_msg_values,
642 "Unknown",
643 msg_type),
644 msg_type,
645 msg_len,
646 GET_BE_U_4(ldp_msg_header->id),
647 LDP_MASK_U_BIT(GET_BE_U_2(ldp_msg_header->type)) ? "continue processing" : "ignore");
648
649 msg_tptr=tptr+sizeof(struct ldp_msg_header);
650 msg_tlen=msg_len-(sizeof(struct ldp_msg_header)-4); /* Type & Length fields not included */
651
652 /* did we capture enough for fully decoding the message ? */
653 ND_TCHECK_LEN(tptr, msg_len);
654 hexdump=FALSE;
655
656 switch(msg_type) {
657
658 case LDP_MSG_NOTIF:
659 case LDP_MSG_HELLO:
660 case LDP_MSG_INIT:
661 case LDP_MSG_KEEPALIVE:
662 case LDP_MSG_ADDRESS:
663 case LDP_MSG_LABEL_MAPPING:
664 case LDP_MSG_ADDRESS_WITHDRAW:
665 case LDP_MSG_LABEL_WITHDRAW:
666 while(msg_tlen >= 4) {
667 processed = ldp_tlv_print(ndo, msg_tptr, msg_tlen);
668 if (processed == 0)
669 break;
670 msg_tlen-=processed;
671 msg_tptr+=processed;
672 }
673 break;
674
675 /*
676 * FIXME those are the defined messages that lack a decoder
677 * you are welcome to contribute code ;-)
678 */
679
680 case LDP_MSG_LABEL_REQUEST:
681 case LDP_MSG_LABEL_RELEASE:
682 case LDP_MSG_LABEL_ABORT_REQUEST:
683
684 default:
685 if (ndo->ndo_vflag <= 1)
686 print_unknown_data(ndo, msg_tptr, "\n\t ", msg_tlen);
687 break;
688 }
689 /* do we want to see an additionally hexdump ? */
690 if (ndo->ndo_vflag > 1 || hexdump==TRUE)
691 print_unknown_data(ndo, tptr+sizeof(struct ldp_msg_header), "\n\t ",
692 msg_len);
693
694 tptr += msg_len+4;
695 tlen -= msg_len+4;
696 }
697 return pdu_len+4;
698 trunc:
699 nd_trunc_longjmp(ndo);
700 }
[mirror] the TCPdump network dissector