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print-fr.c
[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 1.13 2005-05-03 08:21:09 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+=4;
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+=16;
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
379 printf("\n\t\tInterface Parameter: %s (0x%02x), len %u",
380 tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
381 vc_info_tlv_type,
382 vc_info_tlv_len);
383
384 switch(vc_info_tlv_type) {
385 case LDP_FEC_MARTINI_IFPARM_MTU:
386 printf(": %u",EXTRACT_16BITS(tptr+2));
387 break;
388
389 case LDP_FEC_MARTINI_IFPARM_DESC:
390 printf(": ");
391 for (idx = 2; idx < vc_info_tlv_len; idx++)
392 safeputchar(*(tptr+idx));
393 break;
394
395 case LDP_FEC_MARTINI_IFPARM_VCCV:
396 printf("\n\t\t Control Channels (0x%02x) = [%s]",
397 *(tptr+2),
398 bittok2str(ldp_fec_martini_ifparm_vccv_cc_values,"none",*(tptr+2)));
399 printf("\n\t\t CV Types (0x%02x) = [%s]",
400 *(tptr+3),
401 bittok2str(ldp_fec_martini_ifparm_vccv_cv_values,"none",*(tptr+3)));
402 break;
403
404 default:
405 print_unknown_data(tptr+2,"\n\t\t ",vc_info_tlv_len-2);
406 break;
407 }
408
409 vc_info_len -= vc_info_tlv_len;
410 tptr += vc_info_tlv_len;
411 }
412 break;
413 }
414
415 break;
416
417 case LDP_TLV_GENERIC_LABEL:
418 printf("\n\t Label: %u", EXTRACT_32BITS(tptr) & 0xfffff);
419 break;
420
421 case LDP_TLV_STATUS:
422 ui = EXTRACT_32BITS(tptr);
423 tptr+=4;
424 printf("\n\t Status: 0x%02x, Flags: [%s and %s forward]",
425 ui&0x3fffffff,
426 ui&0x80000000 ? "Fatal error" : "Advisory Notification",
427 ui&0x40000000 ? "do" : "don't");
428 ui = EXTRACT_32BITS(tptr);
429 tptr+=4;
430 if (ui)
431 printf(", causing Message ID: 0x%08x", ui);
432 break;
433
434 case LDP_TLV_FT_SESSION:
435 ft_flags = EXTRACT_16BITS(tptr);
436 printf("\n\t Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
437 ft_flags&0x8000 ? "" : "No ",
438 ft_flags&0x8 ? "" : "Don't ",
439 ft_flags&0x4 ? "" : "No ",
440 ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels",
441 ft_flags&0x1 ? "" : "Don't ");
442 tptr+=4;
443 ui = EXTRACT_32BITS(tptr);
444 if (ui)
445 printf(", Reconnect Timeout: %ums", ui);
446 tptr+=4;
447 ui = EXTRACT_32BITS(tptr);
448 if (ui)
449 printf(", Recovery Time: %ums", ui);
450 break;
451
452
453 /*
454 * FIXME those are the defined TLVs that lack a decoder
455 * you are welcome to contribute code ;-)
456 */
457
458 case LDP_TLV_HOP_COUNT:
459 case LDP_TLV_PATH_VECTOR:
460 case LDP_TLV_ATM_LABEL:
461 case LDP_TLV_FR_LABEL:
462 case LDP_TLV_EXTD_STATUS:
463 case LDP_TLV_RETURNED_PDU:
464 case LDP_TLV_RETURNED_MSG:
465 case LDP_TLV_ATM_SESSION_PARM:
466 case LDP_TLV_FR_SESSION_PARM:
467 case LDP_TLV_LABEL_REQUEST_MSG_ID:
468
469 default:
470 if (vflag <= 1)
471 print_unknown_data(tptr,"\n\t ",tlv_tlen);
472 break;
473 }
474 return(tlv_len+4); /* Type & Length fields not included */
475
476 trunc:
477 printf("\n\t\t packet exceeded snapshot");
478 return 0;
479 }
480
481 void
482 ldp_print(register const u_char *pptr, register u_int len) {
483
484 int processed;
485 while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
486 processed = ldp_msg_print(pptr);
487 if (processed == 0)
488 return;
489 len -= processed;
490 pptr += processed;
491 }
492 }
493
494
495 int
496 ldp_msg_print(register const u_char *pptr) {
497
498 const struct ldp_common_header *ldp_com_header;
499 const struct ldp_msg_header *ldp_msg_header;
500 const u_char *tptr,*msg_tptr;
501 u_short tlen;
502 u_short pdu_len,msg_len,msg_type,msg_tlen;
503 int hexdump,processed;
504
505 tptr=pptr;
506 ldp_com_header = (const struct ldp_common_header *)pptr;
507 TCHECK(*ldp_com_header);
508
509 /*
510 * Sanity checking of the header.
511 */
512 if (EXTRACT_16BITS(&ldp_com_header->version) != LDP_VERSION) {
513 printf("%sLDP version %u packet not supported",
514 (vflag < 1) ? "" : "\n\t",
515 EXTRACT_16BITS(&ldp_com_header->version));
516 return 0;
517 }
518
519 /* print the LSR-ID, label-space & length */
520 pdu_len = EXTRACT_16BITS(&ldp_com_header->pdu_length);
521 printf("%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
522 (vflag < 1) ? "" : "\n\t",
523 ipaddr_string(&ldp_com_header->lsr_id),
524 EXTRACT_16BITS(&ldp_com_header->label_space),
525 pdu_len);
526
527 /* bail out if non-verbose */
528 if (vflag < 1)
529 return 0;
530
531 /* ok they seem to want to know everything - lets fully decode it */
532 tlen=pdu_len;
533
534 tptr += sizeof(const struct ldp_common_header);
535 tlen -= sizeof(const struct ldp_common_header)-4; /* Type & Length fields not included */
536
537 while(tlen>0) {
538 /* did we capture enough for fully decoding the msg header ? */
539 if (!TTEST2(*tptr, sizeof(struct ldp_msg_header)))
540 goto trunc;
541
542 ldp_msg_header = (const struct ldp_msg_header *)tptr;
543 msg_len=EXTRACT_16BITS(ldp_msg_header->length);
544 msg_type=LDP_MASK_MSG_TYPE(EXTRACT_16BITS(ldp_msg_header->type));
545
546 /* FIXME vendor private / experimental check */
547 printf("\n\t %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
548 tok2str(ldp_msg_values,
549 "Unknown",
550 msg_type),
551 msg_type,
552 msg_len,
553 EXTRACT_32BITS(&ldp_msg_header->id),
554 LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_msg_header->type)) ? "continue processing" : "ignore");
555
556 if (msg_len == 0) /* infinite loop protection */
557 return 0;
558
559 msg_tptr=tptr+sizeof(struct ldp_msg_header);
560 msg_tlen=msg_len-sizeof(struct ldp_msg_header)+4; /* Type & Length fields not included */
561
562 /* did we capture enough for fully decoding the message ? */
563 if (!TTEST2(*tptr, msg_len))
564 goto trunc;
565 hexdump=FALSE;
566
567 switch(msg_type) {
568
569 case LDP_MSG_NOTIF:
570 case LDP_MSG_HELLO:
571 case LDP_MSG_INIT:
572 case LDP_MSG_KEEPALIVE:
573 case LDP_MSG_ADDRESS:
574 case LDP_MSG_LABEL_MAPPING:
575 while(msg_tlen >= 4) {
576 processed = ldp_tlv_print(msg_tptr);
577 if (processed == 0)
578 break;
579 msg_tlen-=processed;
580 msg_tptr+=processed;
581 }
582 break;
583
584 /*
585 * FIXME those are the defined messages that lack a decoder
586 * you are welcome to contribute code ;-)
587 */
588
589 case LDP_MSG_ADDRESS_WITHDRAW:
590 case LDP_MSG_LABEL_REQUEST:
591 case LDP_MSG_LABEL_WITHDRAW:
592 case LDP_MSG_LABEL_RELEASE:
593 case LDP_MSG_LABEL_ABORT_REQUEST:
594
595 default:
596 if (vflag <= 1)
597 print_unknown_data(msg_tptr,"\n\t ",msg_tlen);
598 break;
599 }
600 /* do we want to see an additionally hexdump ? */
601 if (vflag > 1 || hexdump==TRUE)
602 print_unknown_data(tptr+sizeof(sizeof(struct ldp_msg_header)),"\n\t ",
603 msg_len);
604
605 tptr += msg_len+4;
606 tlen -= msg_len+4;
607 }
608 return pdu_len+4;
609 trunc:
610 printf("\n\t\t packet exceeded snapshot");
611 return 0;
612 }
613
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