]> The Tcpdump Group git mirrors - tcpdump/blob - print-ldp.c
projects / tcpdump / blob
summary | shortlog | log | commit | commitdiff | tree
history | raw | HEAD
code cosmetics:
[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@juniper.net)
14 * and Steinar Haug (sthaug@nethelp.no)
15 */
16
17 #ifndef lint
18 static const char rcsid[] _U_ =
19 "@(#) $Header: /tcpdump/master/tcpdump/print-ldp.c,v 1.15 2005-07-11 20:15:32 hannes Exp $";
20 #endif
21
22 #ifdef HAVE_CONFIG_H
23 #include "config.h"
24 #endif
25
26 #include <tcpdump-stdinc.h>
27
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31
32 #include "interface.h"
33 #include "decode_prefix.h"
34 #include "extract.h"
35 #include "addrtoname.h"
36
37 #include "l2vpn.h"
38
39 /*
40 * ldp common header
41 *
42 * 0 1 2 3
43 * 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
44 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
45 * | Version | PDU Length |
46 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
47 * | LDP Identifier |
48 * + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
49 * | |
50 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
51 *
52 */
53
54 struct ldp_common_header {
55 u_int8_t version[2];
56 u_int8_t pdu_length[2];
57 u_int8_t lsr_id[4];
58 u_int8_t label_space[2];
59 };
60
61 #define LDP_VERSION 1
62
63 /*
64 * ldp message header
65 *
66 * 0 1 2 3
67 * 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
68 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
69 * |U| Message Type | Message Length |
70 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
71 * | Message ID |
72 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
73 * | |
74 * + +
75 * | Mandatory Parameters |
76 * + +
77 * | |
78 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
79 * | |
80 * + +
81 * | Optional Parameters |
82 * + +
83 * | |
84 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
85 */
86
87 struct ldp_msg_header {
88 u_int8_t type[2];
89 u_int8_t length[2];
90 u_int8_t id[4];
91 };
92
93 #define LDP_MASK_MSG_TYPE(x) ((x)&0x7fff)
94 #define LDP_MASK_U_BIT(x) ((x)&0x8000)
95
96 #define LDP_MSG_NOTIF 0x0001
97 #define LDP_MSG_HELLO 0x0100
98 #define LDP_MSG_INIT 0x0200
99 #define LDP_MSG_KEEPALIVE 0x0201
100 #define LDP_MSG_ADDRESS 0x0300
101 #define LDP_MSG_ADDRESS_WITHDRAW 0x0301
102 #define LDP_MSG_LABEL_MAPPING 0x0400
103 #define LDP_MSG_LABEL_REQUEST 0x0401
104 #define LDP_MSG_LABEL_WITHDRAW 0x0402
105 #define LDP_MSG_LABEL_RELEASE 0x0403
106 #define LDP_MSG_LABEL_ABORT_REQUEST 0x0404
107
108 #define LDP_VENDOR_PRIVATE_MIN 0x3e00
109 #define LDP_VENDOR_PRIVATE_MAX 0x3eff
110 #define LDP_EXPERIMENTAL_MIN 0x3f00
111 #define LDP_EXPERIMENTAL_MAX 0x3fff
112
113 static const struct tok ldp_msg_values[] = {
114 { LDP_MSG_NOTIF, "Notification" },
115 { LDP_MSG_HELLO, "Hello" },
116 { LDP_MSG_INIT, "Initialization" },
117 { LDP_MSG_KEEPALIVE, "Keepalive" },
118 { LDP_MSG_ADDRESS, "Address" },
119 { LDP_MSG_ADDRESS_WITHDRAW, "Address Widthdraw" },
120 { LDP_MSG_LABEL_MAPPING, "Label Mapping" },
121 { LDP_MSG_LABEL_REQUEST, "Label Request" },
122 { LDP_MSG_LABEL_WITHDRAW, "Label Withdraw" },
123 { LDP_MSG_LABEL_RELEASE, "Label Release" },
124 { LDP_MSG_LABEL_ABORT_REQUEST, "Label Abort Request" },
125 { 0, NULL}
126 };
127
128 #define LDP_MASK_TLV_TYPE(x) ((x)&0x3fff)
129 #define LDP_MASK_F_BIT(x) ((x)&0x4000)
130
131 #define LDP_TLV_FEC 0x0100
132 #define LDP_TLV_ADDRESS_LIST 0x0101
133 #define LDP_TLV_HOP_COUNT 0x0103
134 #define LDP_TLV_PATH_VECTOR 0x0104
135 #define LDP_TLV_GENERIC_LABEL 0x0200
136 #define LDP_TLV_ATM_LABEL 0x0201
137 #define LDP_TLV_FR_LABEL 0x0202
138 #define LDP_TLV_STATUS 0x0300
139 #define LDP_TLV_EXTD_STATUS 0x0301
140 #define LDP_TLV_RETURNED_PDU 0x0302
141 #define LDP_TLV_RETURNED_MSG 0x0303
142 #define LDP_TLV_COMMON_HELLO 0x0400
143 #define LDP_TLV_IPV4_TRANSPORT_ADDR 0x0401
144 #define LDP_TLV_CONFIG_SEQ_NUMBER 0x0402
145 #define LDP_TLV_IPV6_TRANSPORT_ADDR 0x0403
146 #define LDP_TLV_COMMON_SESSION 0x0500
147 #define LDP_TLV_ATM_SESSION_PARM 0x0501
148 #define LDP_TLV_FR_SESSION_PARM 0x0502
149 #define LDP_TLV_FT_SESSION 0x0503
150 #define LDP_TLV_LABEL_REQUEST_MSG_ID 0x0600
151
152 static const struct tok ldp_tlv_values[] = {
153 { LDP_TLV_FEC, "FEC" },
154 { LDP_TLV_ADDRESS_LIST, "Address List" },
155 { LDP_TLV_HOP_COUNT, "Hop Count" },
156 { LDP_TLV_PATH_VECTOR, "Path Vector" },
157 { LDP_TLV_GENERIC_LABEL, "Generic Label" },
158 { LDP_TLV_ATM_LABEL, "ATM Label" },
159 { LDP_TLV_FR_LABEL, "Frame-Relay Label" },
160 { LDP_TLV_STATUS, "Status" },
161 { LDP_TLV_EXTD_STATUS, "Extended Status" },
162 { LDP_TLV_RETURNED_PDU, "Returned PDU" },
163 { LDP_TLV_RETURNED_MSG, "Returned Message" },
164 { LDP_TLV_COMMON_HELLO, "Common Hello Parameters" },
165 { LDP_TLV_IPV4_TRANSPORT_ADDR, "IPv4 Transport Address" },
166 { LDP_TLV_CONFIG_SEQ_NUMBER, "Configuration Sequence Number" },
167 { LDP_TLV_IPV6_TRANSPORT_ADDR, "IPv6 Transport Address" },
168 { LDP_TLV_COMMON_SESSION, "Common Session Parameters" },
169 { LDP_TLV_ATM_SESSION_PARM, "ATM Session Parameters" },
170 { LDP_TLV_FR_SESSION_PARM, "Frame-Relay Session Parameters" },
171 { LDP_TLV_FT_SESSION, "Fault-Tolerant Session Parameters" },
172 { LDP_TLV_LABEL_REQUEST_MSG_ID, "Label Request Message ID" },
173 { 0, NULL}
174 };
175
176 #define LDP_FEC_WILDCARD 0x01
177 #define LDP_FEC_PREFIX 0x02
178 #define LDP_FEC_HOSTADDRESS 0x03
179 /* From draft-martini-l2circuit-trans-mpls-13.txt */
180 #define LDP_FEC_MARTINI_VC 0x80
181
182 static const struct tok ldp_fec_values[] = {
183 { LDP_FEC_WILDCARD, "Wildcard" },
184 { LDP_FEC_PREFIX, "Prefix" },
185 { LDP_FEC_HOSTADDRESS, "Host address" },
186 { LDP_FEC_MARTINI_VC, "Martini VC" },
187 { 0, NULL}
188 };
189
190 #define LDP_FEC_MARTINI_IFPARM_MTU 0x01
191 #define LDP_FEC_MARTINI_IFPARM_DESC 0x03
192 #define LDP_FEC_MARTINI_IFPARM_VCCV 0x0c
193
194 static const struct tok ldp_fec_martini_ifparm_values[] = {
195 { LDP_FEC_MARTINI_IFPARM_MTU, "MTU" },
196 { LDP_FEC_MARTINI_IFPARM_DESC, "Description" },
197 { LDP_FEC_MARTINI_IFPARM_VCCV, "VCCV" },
198 { 0, NULL}
199 };
200
201 /* draft-ietf-pwe3-vccv-04.txt */
202 static const struct tok ldp_fec_martini_ifparm_vccv_cc_values[] = {
203 { 0x01, "PWE3 control word" },
204 { 0x02, "MPLS Router Alert Label" },
205 { 0x04, "MPLS inner label TTL = 1" },
206 { 0, NULL}
207 };
208
209 /* draft-ietf-pwe3-vccv-04.txt */
210 static const struct tok ldp_fec_martini_ifparm_vccv_cv_values[] = {
211 { 0x01, "ICMP Ping" },
212 { 0x02, "LSP Ping" },
213 { 0x04, "BFD" },
214 { 0, NULL}
215 };
216
217 /* RFC1700 address family numbers, same definition in print-bgp.c */
218 #define AFNUM_INET 1
219 #define AFNUM_INET6 2
220
221 #define FALSE 0
222 #define TRUE 1
223
224 int ldp_msg_print(register const u_char *);
225 int ldp_tlv_print(register const u_char *);
226
227 /*
228 * ldp tlv header
229 *
230 * 0 1 2 3
231 * 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
232 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
233 * |U|F| Type | Length |
234 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
235 * | |
236 * | Value |
237 * ~ ~
238 * | |
239 * | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
240 * | |
241 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
242 */
243
244 int
245 ldp_tlv_print(register const u_char *tptr) {
246
247 struct ldp_tlv_header {
248 u_int8_t type[2];
249 u_int8_t length[2];
250 };
251
252 const struct ldp_tlv_header *ldp_tlv_header;
253 u_short tlv_type,tlv_len,tlv_tlen,af,ft_flags;
254 u_char fec_type;
255 u_int ui,vc_info_len, vc_info_tlv_type, vc_info_tlv_len,idx;
256 char buf[100];
257 int i;
258
259 ldp_tlv_header = (const struct ldp_tlv_header *)tptr;
260 tlv_len=EXTRACT_16BITS(ldp_tlv_header->length);
261 tlv_tlen=tlv_len;
262 tlv_type=LDP_MASK_TLV_TYPE(EXTRACT_16BITS(ldp_tlv_header->type));
263
264 /* FIXME vendor private / experimental check */
265 printf("\n\t %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]",
266 tok2str(ldp_tlv_values,
267 "Unknown",
268 tlv_type),
269 tlv_type,
270 tlv_len,
271 LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "continue processing" : "ignore",
272 LDP_MASK_F_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "do" : "don't");
273
274 tptr+=sizeof(struct ldp_tlv_header);
275
276 switch(tlv_type) {
277
278 case LDP_TLV_COMMON_HELLO:
279 printf("\n\t Hold Time: %us, Flags: [%s Hello%s]",
280 EXTRACT_16BITS(tptr),
281 (EXTRACT_16BITS(tptr+2)&0x8000) ? "Targeted" : "Link",
282 (EXTRACT_16BITS(tptr+2)&0x4000) ? ", Request for targeted Hellos" : "");
283 break;
284
285 case LDP_TLV_IPV4_TRANSPORT_ADDR:
286 printf("\n\t IPv4 Transport Address: %s", ipaddr_string(tptr));
287 break;
288 #ifdef INET6
289 case LDP_TLV_IPV6_TRANSPORT_ADDR:
290 printf("\n\t IPv6 Transport Address: %s", ip6addr_string(tptr));
291 break;
292 #endif
293 case LDP_TLV_CONFIG_SEQ_NUMBER:
294 printf("\n\t Sequence Number: %u", EXTRACT_32BITS(tptr));
295 break;
296
297 case LDP_TLV_ADDRESS_LIST:
298 af = EXTRACT_16BITS(tptr);
299 tptr+=2;
300 printf("\n\t Adress Family: ");
301 if (af == AFNUM_INET) {
302 printf("IPv4, addresses:");
303 for (i=0; i<(tlv_tlen-2)/4; i++) {
304 printf(" %s",ipaddr_string(tptr));
305 tptr+=sizeof(struct in_addr);
306 }
307 }
308 #ifdef INET6
309 else if (af == AFNUM_INET6) {
310 printf("IPv6, addresses:");
311 for (i=0; i<(tlv_tlen-2)/16; i++) {
312 printf(" %s",ip6addr_string(tptr));
313 tptr+=sizeof(struct in6_addr);
314 }
315 }
316 #endif
317 break;
318
319 case LDP_TLV_COMMON_SESSION:
320 printf("\n\t Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
321 EXTRACT_16BITS(tptr), EXTRACT_16BITS(tptr+2),
322 (EXTRACT_16BITS(tptr+6)&0x8000) ? "On Demand" : "Unsolicited",
323 (EXTRACT_16BITS(tptr+6)&0x4000) ? "Enabled" : "Disabled"
324 );
325 break;
326
327 case LDP_TLV_FEC:
328 fec_type = *tptr;
329 printf("\n\t %s FEC (0x%02x)",
330 tok2str(ldp_fec_values, "Unknown", fec_type),
331 fec_type);
332
333 tptr+=1;
334 switch(fec_type) {
335
336 case LDP_FEC_WILDCARD:
337 break;
338 case LDP_FEC_PREFIX:
339 af = EXTRACT_16BITS(tptr);
340 tptr+=2;
341 if (af == AFNUM_INET) {
342 i=decode_prefix4(tptr,buf,sizeof(buf));
343 printf(": IPv4 prefix %s",buf);
344 }
345 #ifdef INET6
346 else if (af == AFNUM_INET6) {
347 i=decode_prefix6(tptr,buf,sizeof(buf));
348 printf(": IPv6 prefix %s",buf);
349 }
350 #endif
351 break;
352 case LDP_FEC_HOSTADDRESS:
353 break;
354 case LDP_FEC_MARTINI_VC:
355 if (!TTEST2(*tptr, 11))
356 goto trunc;
357 vc_info_len = *(tptr+2);
358
359 printf(": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
360 tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
361 EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
362 EXTRACT_32BITS(tptr+3),
363 EXTRACT_32BITS(tptr+7),
364 vc_info_len);
365
366 if (vc_info_len == 0) /* infinite loop protection */
367 break;
368
369 tptr+=11;
370 if (!TTEST2(*tptr, vc_info_len))
371 goto trunc;
372
373 while (vc_info_len > 2) {
374 vc_info_tlv_type = *tptr;
375 vc_info_tlv_len = *(tptr+1);
376 if (vc_info_tlv_len < 2)
377 break;
378 if (vc_info_len < vc_info_tlv_len)
379 break;
380
381 printf("\n\t\tInterface Parameter: %s (0x%02x), len %u",
382 tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
383 vc_info_tlv_type,
384 vc_info_tlv_len);
385
386 switch(vc_info_tlv_type) {
387 case LDP_FEC_MARTINI_IFPARM_MTU:
388 printf(": %u",EXTRACT_16BITS(tptr+2));
389 break;
390
391 case LDP_FEC_MARTINI_IFPARM_DESC:
392 printf(": ");
393 for (idx = 2; idx < vc_info_tlv_len; idx++)
394 safeputchar(*(tptr+idx));
395 break;
396
397 case LDP_FEC_MARTINI_IFPARM_VCCV:
398 printf("\n\t\t Control Channels (0x%02x) = [%s]",
399 *(tptr+2),
400 bittok2str(ldp_fec_martini_ifparm_vccv_cc_values,"none",*(tptr+2)));
401 printf("\n\t\t CV Types (0x%02x) = [%s]",
402 *(tptr+3),
403 bittok2str(ldp_fec_martini_ifparm_vccv_cv_values,"none",*(tptr+3)));
404 break;
405
406 default:
407 print_unknown_data(tptr+2,"\n\t\t ",vc_info_tlv_len-2);
408 break;
409 }
410
411 vc_info_len -= vc_info_tlv_len;
412 tptr += vc_info_tlv_len;
413 }
414 break;
415 }
416
417 break;
418
419 case LDP_TLV_GENERIC_LABEL:
420 printf("\n\t Label: %u", EXTRACT_32BITS(tptr) & 0xfffff);
421 break;
422
423 case LDP_TLV_STATUS:
424 ui = EXTRACT_32BITS(tptr);
425 tptr+=4;
426 printf("\n\t Status: 0x%02x, Flags: [%s and %s forward]",
427 ui&0x3fffffff,
428 ui&0x80000000 ? "Fatal error" : "Advisory Notification",
429 ui&0x40000000 ? "do" : "don't");
430 ui = EXTRACT_32BITS(tptr);
431 tptr+=4;
432 if (ui)
433 printf(", causing Message ID: 0x%08x", ui);
434 break;
435
436 case LDP_TLV_FT_SESSION:
437 ft_flags = EXTRACT_16BITS(tptr);
438 printf("\n\t Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
439 ft_flags&0x8000 ? "" : "No ",
440 ft_flags&0x8 ? "" : "Don't ",
441 ft_flags&0x4 ? "" : "No ",
442 ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels",
443 ft_flags&0x1 ? "" : "Don't ");
444 tptr+=4;
445 ui = EXTRACT_32BITS(tptr);
446 if (ui)
447 printf(", Reconnect Timeout: %ums", ui);
448 tptr+=4;
449 ui = EXTRACT_32BITS(tptr);
450 if (ui)
451 printf(", Recovery Time: %ums", ui);
452 break;
453
454
455 /*
456 * FIXME those are the defined TLVs that lack a decoder
457 * you are welcome to contribute code ;-)
458 */
459
460 case LDP_TLV_HOP_COUNT:
461 case LDP_TLV_PATH_VECTOR:
462 case LDP_TLV_ATM_LABEL:
463 case LDP_TLV_FR_LABEL:
464 case LDP_TLV_EXTD_STATUS:
465 case LDP_TLV_RETURNED_PDU:
466 case LDP_TLV_RETURNED_MSG:
467 case LDP_TLV_ATM_SESSION_PARM:
468 case LDP_TLV_FR_SESSION_PARM:
469 case LDP_TLV_LABEL_REQUEST_MSG_ID:
470
471 default:
472 if (vflag <= 1)
473 print_unknown_data(tptr,"\n\t ",tlv_tlen);
474 break;
475 }
476 return(tlv_len+4); /* Type & Length fields not included */
477
478 trunc:
479 printf("\n\t\t packet exceeded snapshot");
480 return 0;
481 }
482
483 void
484 ldp_print(register const u_char *pptr, register u_int len) {
485
486 int processed;
487 while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
488 processed = ldp_msg_print(pptr);
489 if (processed == 0)
490 return;
491 len -= processed;
492 pptr += processed;
493 }
494 }
495
496
497 int
498 ldp_msg_print(register const u_char *pptr) {
499
500 const struct ldp_common_header *ldp_com_header;
501 const struct ldp_msg_header *ldp_msg_header;
502 const u_char *tptr,*msg_tptr;
503 u_short tlen;
504 u_short pdu_len,msg_len,msg_type,msg_tlen;
505 int hexdump,processed;
506
507 tptr=pptr;
508 ldp_com_header = (const struct ldp_common_header *)pptr;
509 TCHECK(*ldp_com_header);
510
511 /*
512 * Sanity checking of the header.
513 */
514 if (EXTRACT_16BITS(&ldp_com_header->version) != LDP_VERSION) {
515 printf("%sLDP version %u packet not supported",
516 (vflag < 1) ? "" : "\n\t",
517 EXTRACT_16BITS(&ldp_com_header->version));
518 return 0;
519 }
520
521 /* print the LSR-ID, label-space & length */
522 pdu_len = EXTRACT_16BITS(&ldp_com_header->pdu_length);
523 printf("%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
524 (vflag < 1) ? "" : "\n\t",
525 ipaddr_string(&ldp_com_header->lsr_id),
526 EXTRACT_16BITS(&ldp_com_header->label_space),
527 pdu_len);
528
529 /* bail out if non-verbose */
530 if (vflag < 1)
531 return 0;
532
533 /* ok they seem to want to know everything - lets fully decode it */
534 tlen=pdu_len;
535
536 tptr += sizeof(const struct ldp_common_header);
537 tlen -= sizeof(const struct ldp_common_header)-4; /* Type & Length fields not included */
538
539 while(tlen>0) {
540 /* did we capture enough for fully decoding the msg header ? */
541 if (!TTEST2(*tptr, sizeof(struct ldp_msg_header)))
542 goto trunc;
543
544 ldp_msg_header = (const struct ldp_msg_header *)tptr;
545 msg_len=EXTRACT_16BITS(ldp_msg_header->length);
546 msg_type=LDP_MASK_MSG_TYPE(EXTRACT_16BITS(ldp_msg_header->type));
547
548 /* FIXME vendor private / experimental check */
549 printf("\n\t %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
550 tok2str(ldp_msg_values,
551 "Unknown",
552 msg_type),
553 msg_type,
554 msg_len,
555 EXTRACT_32BITS(&ldp_msg_header->id),
556 LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_msg_header->type)) ? "continue processing" : "ignore");
557
558 if (msg_len == 0) /* infinite loop protection */
559 return 0;
560
561 msg_tptr=tptr+sizeof(struct ldp_msg_header);
562 msg_tlen=msg_len-sizeof(struct ldp_msg_header)+4; /* Type & Length fields not included */
563
564 /* did we capture enough for fully decoding the message ? */
565 if (!TTEST2(*tptr, msg_len))
566 goto trunc;
567 hexdump=FALSE;
568
569 switch(msg_type) {
570
571 case LDP_MSG_NOTIF:
572 case LDP_MSG_HELLO:
573 case LDP_MSG_INIT:
574 case LDP_MSG_KEEPALIVE:
575 case LDP_MSG_ADDRESS:
576 case LDP_MSG_LABEL_MAPPING:
577 while(msg_tlen >= 4) {
578 processed = ldp_tlv_print(msg_tptr);
579 if (processed == 0)
580 break;
581 msg_tlen-=processed;
582 msg_tptr+=processed;
583 }
584 break;
585
586 /*
587 * FIXME those are the defined messages that lack a decoder
588 * you are welcome to contribute code ;-)
589 */
590
591 case LDP_MSG_ADDRESS_WITHDRAW:
592 case LDP_MSG_LABEL_REQUEST:
593 case LDP_MSG_LABEL_WITHDRAW:
594 case LDP_MSG_LABEL_RELEASE:
595 case LDP_MSG_LABEL_ABORT_REQUEST:
596
597 default:
598 if (vflag <= 1)
599 print_unknown_data(msg_tptr,"\n\t ",msg_tlen);
600 break;
601 }
602 /* do we want to see an additionally hexdump ? */
603 if (vflag > 1 || hexdump==TRUE)
604 print_unknown_data(tptr+sizeof(sizeof(struct ldp_msg_header)),"\n\t ",
605 msg_len);
606
607 tptr += msg_len+4;
608 tlen -= msg_len+4;
609 }
610 return pdu_len+4;
611 trunc:
612 printf("\n\t\t packet exceeded snapshot");
613 return 0;
614 }
615
[mirror] the TCPdump network dissector