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dismiss decode_prefix.h
[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 #ifdef HAVE_CONFIG_H
18 #include "config.h"
19 #endif
20
21 #include <tcpdump-stdinc.h>
22
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26
27 #include "interface.h"
28 #include "extract.h"
29 #include "addrtoname.h"
30
31 #include "l2vpn.h"
32 #include "af.h"
33
34 /*
35 * ldp common header
36 *
37 * 0 1 2 3
38 * 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
39 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
40 * | Version | PDU Length |
41 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
42 * | LDP Identifier |
43 * + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
44 * | |
45 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
46 *
47 */
48
49 struct ldp_common_header {
50 u_int8_t version[2];
51 u_int8_t pdu_length[2];
52 u_int8_t lsr_id[4];
53 u_int8_t label_space[2];
54 };
55
56 #define LDP_VERSION 1
57
58 /*
59 * ldp message header
60 *
61 * 0 1 2 3
62 * 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
63 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
64 * |U| Message Type | Message Length |
65 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
66 * | Message ID |
67 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
68 * | |
69 * + +
70 * | Mandatory Parameters |
71 * + +
72 * | |
73 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
74 * | |
75 * + +
76 * | Optional Parameters |
77 * + +
78 * | |
79 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
80 */
81
82 struct ldp_msg_header {
83 u_int8_t type[2];
84 u_int8_t length[2];
85 u_int8_t id[4];
86 };
87
88 #define LDP_MASK_MSG_TYPE(x) ((x)&0x7fff)
89 #define LDP_MASK_U_BIT(x) ((x)&0x8000)
90
91 #define LDP_MSG_NOTIF 0x0001
92 #define LDP_MSG_HELLO 0x0100
93 #define LDP_MSG_INIT 0x0200
94 #define LDP_MSG_KEEPALIVE 0x0201
95 #define LDP_MSG_ADDRESS 0x0300
96 #define LDP_MSG_ADDRESS_WITHDRAW 0x0301
97 #define LDP_MSG_LABEL_MAPPING 0x0400
98 #define LDP_MSG_LABEL_REQUEST 0x0401
99 #define LDP_MSG_LABEL_WITHDRAW 0x0402
100 #define LDP_MSG_LABEL_RELEASE 0x0403
101 #define LDP_MSG_LABEL_ABORT_REQUEST 0x0404
102
103 #define LDP_VENDOR_PRIVATE_MIN 0x3e00
104 #define LDP_VENDOR_PRIVATE_MAX 0x3eff
105 #define LDP_EXPERIMENTAL_MIN 0x3f00
106 #define LDP_EXPERIMENTAL_MAX 0x3fff
107
108 static const struct tok ldp_msg_values[] = {
109 { LDP_MSG_NOTIF, "Notification" },
110 { LDP_MSG_HELLO, "Hello" },
111 { LDP_MSG_INIT, "Initialization" },
112 { LDP_MSG_KEEPALIVE, "Keepalive" },
113 { LDP_MSG_ADDRESS, "Address" },
114 { LDP_MSG_ADDRESS_WITHDRAW, "Address Withdraw" },
115 { LDP_MSG_LABEL_MAPPING, "Label Mapping" },
116 { LDP_MSG_LABEL_REQUEST, "Label Request" },
117 { LDP_MSG_LABEL_WITHDRAW, "Label Withdraw" },
118 { LDP_MSG_LABEL_RELEASE, "Label Release" },
119 { LDP_MSG_LABEL_ABORT_REQUEST, "Label Abort Request" },
120 { 0, NULL}
121 };
122
123 #define LDP_MASK_TLV_TYPE(x) ((x)&0x3fff)
124 #define LDP_MASK_F_BIT(x) ((x)&0x4000)
125
126 #define LDP_TLV_FEC 0x0100
127 #define LDP_TLV_ADDRESS_LIST 0x0101
128 #define LDP_TLV_ADDRESS_LIST_AFNUM_LEN 2
129 #define LDP_TLV_HOP_COUNT 0x0103
130 #define LDP_TLV_PATH_VECTOR 0x0104
131 #define LDP_TLV_GENERIC_LABEL 0x0200
132 #define LDP_TLV_ATM_LABEL 0x0201
133 #define LDP_TLV_FR_LABEL 0x0202
134 #define LDP_TLV_STATUS 0x0300
135 #define LDP_TLV_EXTD_STATUS 0x0301
136 #define LDP_TLV_RETURNED_PDU 0x0302
137 #define LDP_TLV_RETURNED_MSG 0x0303
138 #define LDP_TLV_COMMON_HELLO 0x0400
139 #define LDP_TLV_IPV4_TRANSPORT_ADDR 0x0401
140 #define LDP_TLV_CONFIG_SEQ_NUMBER 0x0402
141 #define LDP_TLV_IPV6_TRANSPORT_ADDR 0x0403
142 #define LDP_TLV_COMMON_SESSION 0x0500
143 #define LDP_TLV_ATM_SESSION_PARM 0x0501
144 #define LDP_TLV_FR_SESSION_PARM 0x0502
145 #define LDP_TLV_FT_SESSION 0x0503
146 #define LDP_TLV_LABEL_REQUEST_MSG_ID 0x0600
147 #define LDP_TLV_MTU 0x0601 /* rfc 3988 */
148
149 static const struct tok ldp_tlv_values[] = {
150 { LDP_TLV_FEC, "FEC" },
151 { LDP_TLV_ADDRESS_LIST, "Address List" },
152 { LDP_TLV_HOP_COUNT, "Hop Count" },
153 { LDP_TLV_PATH_VECTOR, "Path Vector" },
154 { LDP_TLV_GENERIC_LABEL, "Generic Label" },
155 { LDP_TLV_ATM_LABEL, "ATM Label" },
156 { LDP_TLV_FR_LABEL, "Frame-Relay Label" },
157 { LDP_TLV_STATUS, "Status" },
158 { LDP_TLV_EXTD_STATUS, "Extended Status" },
159 { LDP_TLV_RETURNED_PDU, "Returned PDU" },
160 { LDP_TLV_RETURNED_MSG, "Returned Message" },
161 { LDP_TLV_COMMON_HELLO, "Common Hello Parameters" },
162 { LDP_TLV_IPV4_TRANSPORT_ADDR, "IPv4 Transport Address" },
163 { LDP_TLV_CONFIG_SEQ_NUMBER, "Configuration Sequence Number" },
164 { LDP_TLV_IPV6_TRANSPORT_ADDR, "IPv6 Transport Address" },
165 { LDP_TLV_COMMON_SESSION, "Common Session Parameters" },
166 { LDP_TLV_ATM_SESSION_PARM, "ATM Session Parameters" },
167 { LDP_TLV_FR_SESSION_PARM, "Frame-Relay Session Parameters" },
168 { LDP_TLV_FT_SESSION, "Fault-Tolerant Session Parameters" },
169 { LDP_TLV_LABEL_REQUEST_MSG_ID, "Label Request Message ID" },
170 { LDP_TLV_MTU, "MTU" },
171 { 0, NULL}
172 };
173
174 #define LDP_FEC_WILDCARD 0x01
175 #define LDP_FEC_PREFIX 0x02
176 #define LDP_FEC_HOSTADDRESS 0x03
177 /* From RFC 4906; should probably be updated to RFC 4447 (e.g., VC -> PW) */
178 #define LDP_FEC_MARTINI_VC 0x80
179
180 static const struct tok ldp_fec_values[] = {
181 { LDP_FEC_WILDCARD, "Wildcard" },
182 { LDP_FEC_PREFIX, "Prefix" },
183 { LDP_FEC_HOSTADDRESS, "Host address" },
184 { LDP_FEC_MARTINI_VC, "Martini VC" },
185 { 0, NULL}
186 };
187
188 #define LDP_FEC_MARTINI_IFPARM_MTU 0x01
189 #define LDP_FEC_MARTINI_IFPARM_DESC 0x03
190 #define LDP_FEC_MARTINI_IFPARM_VCCV 0x0c
191
192 static const struct tok ldp_fec_martini_ifparm_values[] = {
193 { LDP_FEC_MARTINI_IFPARM_MTU, "MTU" },
194 { LDP_FEC_MARTINI_IFPARM_DESC, "Description" },
195 { LDP_FEC_MARTINI_IFPARM_VCCV, "VCCV" },
196 { 0, NULL}
197 };
198
199 /* draft-ietf-pwe3-vccv-04.txt */
200 static const struct tok ldp_fec_martini_ifparm_vccv_cc_values[] = {
201 { 0x01, "PWE3 control word" },
202 { 0x02, "MPLS Router Alert Label" },
203 { 0x04, "MPLS inner label TTL = 1" },
204 { 0, NULL}
205 };
206
207 /* draft-ietf-pwe3-vccv-04.txt */
208 static const struct tok ldp_fec_martini_ifparm_vccv_cv_values[] = {
209 { 0x01, "ICMP Ping" },
210 { 0x02, "LSP Ping" },
211 { 0x04, "BFD" },
212 { 0, NULL}
213 };
214
215 int ldp_msg_print(register const u_char *);
216 int ldp_tlv_print(register const u_char *);
217
218 /*
219 * ldp tlv header
220 *
221 * 0 1 2 3
222 * 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
223 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
224 * |U|F| Type | Length |
225 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
226 * | |
227 * | Value |
228 * ~ ~
229 * | |
230 * | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
231 * | |
232 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
233 */
234
235 #define TLV_TCHECK(minlen) \
236 TCHECK2(*tptr, minlen); if (tlv_tlen < minlen) goto badtlv;
237
238 int
239 ldp_tlv_print(register const u_char *tptr) {
240
241 struct ldp_tlv_header {
242 u_int8_t type[2];
243 u_int8_t length[2];
244 };
245
246 const struct ldp_tlv_header *ldp_tlv_header;
247 u_short tlv_type,tlv_len,tlv_tlen,af,ft_flags;
248 u_char fec_type;
249 u_int ui,vc_info_len, vc_info_tlv_type, vc_info_tlv_len,idx;
250 char buf[100];
251 int i;
252
253 ldp_tlv_header = (const struct ldp_tlv_header *)tptr;
254 tlv_len=EXTRACT_16BITS(ldp_tlv_header->length);
255 tlv_tlen=tlv_len;
256 tlv_type=LDP_MASK_TLV_TYPE(EXTRACT_16BITS(ldp_tlv_header->type));
257
258 /* FIXME vendor private / experimental check */
259 printf("\n\t %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]",
260 tok2str(ldp_tlv_values,
261 "Unknown",
262 tlv_type),
263 tlv_type,
264 tlv_len,
265 LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "continue processing" : "ignore",
266 LDP_MASK_F_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "do" : "don't");
267
268 tptr+=sizeof(struct ldp_tlv_header);
269
270 switch(tlv_type) {
271
272 case LDP_TLV_COMMON_HELLO:
273 TLV_TCHECK(4);
274 printf("\n\t Hold Time: %us, Flags: [%s Hello%s]",
275 EXTRACT_16BITS(tptr),
276 (EXTRACT_16BITS(tptr+2)&0x8000) ? "Targeted" : "Link",
277 (EXTRACT_16BITS(tptr+2)&0x4000) ? ", Request for targeted Hellos" : "");
278 break;
279
280 case LDP_TLV_IPV4_TRANSPORT_ADDR:
281 TLV_TCHECK(4);
282 printf("\n\t IPv4 Transport Address: %s", ipaddr_string(tptr));
283 break;
284 #ifdef INET6
285 case LDP_TLV_IPV6_TRANSPORT_ADDR:
286 TLV_TCHECK(16);
287 printf("\n\t IPv6 Transport Address: %s", ip6addr_string(tptr));
288 break;
289 #endif
290 case LDP_TLV_CONFIG_SEQ_NUMBER:
291 TLV_TCHECK(4);
292 printf("\n\t Sequence Number: %u", EXTRACT_32BITS(tptr));
293 break;
294
295 case LDP_TLV_ADDRESS_LIST:
296 TLV_TCHECK(LDP_TLV_ADDRESS_LIST_AFNUM_LEN);
297 af = EXTRACT_16BITS(tptr);
298 tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
299 tlv_tlen -= LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
300 printf("\n\t Address Family: %s, addresses",
301 tok2str(af_values, "Unknown (%u)", af));
302 switch (af) {
303 case AFNUM_INET:
304 while(tlv_tlen >= sizeof(struct in_addr)) {
305 TCHECK2(*tptr, sizeof(struct in_addr));
306 printf(" %s",ipaddr_string(tptr));
307 tlv_tlen-=sizeof(struct in_addr);
308 tptr+=sizeof(struct in_addr);
309 }
310 break;
311 #ifdef INET6
312 case AFNUM_INET6:
313 while(tlv_tlen >= sizeof(struct in6_addr)) {
314 TCHECK2(*tptr, sizeof(struct in6_addr));
315 printf(" %s",ip6addr_string(tptr));
316 tlv_tlen-=sizeof(struct in6_addr);
317 tptr+=sizeof(struct in6_addr);
318 }
319 break;
320 #endif
321 default:
322 /* unknown AF */
323 break;
324 }
325 break;
326
327 case LDP_TLV_COMMON_SESSION:
328 TLV_TCHECK(8);
329 printf("\n\t Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
330 EXTRACT_16BITS(tptr), EXTRACT_16BITS(tptr+2),
331 (EXTRACT_16BITS(tptr+6)&0x8000) ? "On Demand" : "Unsolicited",
332 (EXTRACT_16BITS(tptr+6)&0x4000) ? "Enabled" : "Disabled"
333 );
334 break;
335
336 case LDP_TLV_FEC:
337 TLV_TCHECK(1);
338 fec_type = *tptr;
339 printf("\n\t %s FEC (0x%02x)",
340 tok2str(ldp_fec_values, "Unknown", fec_type),
341 fec_type);
342
343 tptr+=1;
344 tlv_tlen-=1;
345 switch(fec_type) {
346
347 case LDP_FEC_WILDCARD:
348 break;
349 case LDP_FEC_PREFIX:
350 TLV_TCHECK(2);
351 af = EXTRACT_16BITS(tptr);
352 tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
353 tlv_tlen-=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
354 if (af == AFNUM_INET) {
355 i=decode_prefix4(tptr,tlv_tlen,buf,sizeof(buf));
356 if (i == -2)
357 goto trunc;
358 if (i == -3)
359 printf(": IPv4 prefix (goes past end of TLV)");
360 else if (i == -1)
361 printf(": IPv4 prefix (invalid length)");
362 else
363 printf(": IPv4 prefix %s",buf);
364 }
365 #ifdef INET6
366 else if (af == AFNUM_INET6) {
367 i=decode_prefix6(tptr,tlv_tlen,buf,sizeof(buf));
368 if (i == -2)
369 goto trunc;
370 if (i == -3)
371 printf(": IPv4 prefix (goes past end of TLV)");
372 else if (i == -1)
373 printf(": IPv6 prefix (invalid length)");
374 else
375 printf(": IPv6 prefix %s",buf);
376 }
377 #endif
378 else
379 printf(": Address family %u prefix", af);
380 break;
381 case LDP_FEC_HOSTADDRESS:
382 break;
383 case LDP_FEC_MARTINI_VC:
384 /*
385 * According to RFC 4908, the VC info Length field can be zero,
386 * in which case not only are there no interface parameters,
387 * there's no VC ID.
388 */
389 TLV_TCHECK(7);
390 vc_info_len = *(tptr+2);
391
392 if (vc_info_len == 0) {
393 printf(": %s, %scontrol word, group-ID %u, VC-info-length: %u",
394 tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
395 EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
396 EXTRACT_32BITS(tptr+3),
397 vc_info_len);
398 break;
399 }
400
401 /* Make sure we have the VC ID as well */
402 TLV_TCHECK(11);
403 printf(": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
404 tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
405 EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
406 EXTRACT_32BITS(tptr+3),
407 EXTRACT_32BITS(tptr+7),
408 vc_info_len);
409 if (vc_info_len < 4)
410 goto trunc; /* minimum 4, for the VC ID */
411 vc_info_len -= 4; /* subtract out the VC ID, giving the length of the interface parameters */
412
413 /* Skip past the fixed information and the VC ID */
414 tptr+=11;
415 tlv_tlen-=11;
416 TLV_TCHECK(vc_info_len);
417
418 while (vc_info_len > 2) {
419 vc_info_tlv_type = *tptr;
420 vc_info_tlv_len = *(tptr+1);
421 if (vc_info_tlv_len < 2)
422 break;
423 if (vc_info_len < vc_info_tlv_len)
424 break;
425
426 printf("\n\t\tInterface Parameter: %s (0x%02x), len %u",
427 tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
428 vc_info_tlv_type,
429 vc_info_tlv_len);
430
431 switch(vc_info_tlv_type) {
432 case LDP_FEC_MARTINI_IFPARM_MTU:
433 printf(": %u",EXTRACT_16BITS(tptr+2));
434 break;
435
436 case LDP_FEC_MARTINI_IFPARM_DESC:
437 printf(": ");
438 for (idx = 2; idx < vc_info_tlv_len; idx++)
439 safeputchar(*(tptr+idx));
440 break;
441
442 case LDP_FEC_MARTINI_IFPARM_VCCV:
443 printf("\n\t\t Control Channels (0x%02x) = [%s]",
444 *(tptr+2),
445 bittok2str(ldp_fec_martini_ifparm_vccv_cc_values,"none",*(tptr+2)));
446 printf("\n\t\t CV Types (0x%02x) = [%s]",
447 *(tptr+3),
448 bittok2str(ldp_fec_martini_ifparm_vccv_cv_values,"none",*(tptr+3)));
449 break;
450
451 default:
452 print_unknown_data(gndo,tptr+2,"\n\t\t ",vc_info_tlv_len-2);
453 break;
454 }
455
456 vc_info_len -= vc_info_tlv_len;
457 tptr += vc_info_tlv_len;
458 }
459 break;
460 }
461
462 break;
463
464 case LDP_TLV_GENERIC_LABEL:
465 TLV_TCHECK(4);
466 printf("\n\t Label: %u", EXTRACT_32BITS(tptr) & 0xfffff);
467 break;
468
469 case LDP_TLV_STATUS:
470 TLV_TCHECK(8);
471 ui = EXTRACT_32BITS(tptr);
472 tptr+=4;
473 printf("\n\t Status: 0x%02x, Flags: [%s and %s forward]",
474 ui&0x3fffffff,
475 ui&0x80000000 ? "Fatal error" : "Advisory Notification",
476 ui&0x40000000 ? "do" : "don't");
477 ui = EXTRACT_32BITS(tptr);
478 tptr+=4;
479 if (ui)
480 printf(", causing Message ID: 0x%08x", ui);
481 break;
482
483 case LDP_TLV_FT_SESSION:
484 TLV_TCHECK(8);
485 ft_flags = EXTRACT_16BITS(tptr);
486 printf("\n\t Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
487 ft_flags&0x8000 ? "" : "No ",
488 ft_flags&0x8 ? "" : "Don't ",
489 ft_flags&0x4 ? "" : "No ",
490 ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels",
491 ft_flags&0x1 ? "" : "Don't ");
492 tptr+=4;
493 ui = EXTRACT_32BITS(tptr);
494 if (ui)
495 printf(", Reconnect Timeout: %ums", ui);
496 tptr+=4;
497 ui = EXTRACT_32BITS(tptr);
498 if (ui)
499 printf(", Recovery Time: %ums", ui);
500 break;
501
502 case LDP_TLV_MTU:
503 TLV_TCHECK(2);
504 printf("\n\t MTU: %u", EXTRACT_16BITS(tptr));
505 break;
506
507
508 /*
509 * FIXME those are the defined TLVs that lack a decoder
510 * you are welcome to contribute code ;-)
511 */
512
513 case LDP_TLV_HOP_COUNT:
514 case LDP_TLV_PATH_VECTOR:
515 case LDP_TLV_ATM_LABEL:
516 case LDP_TLV_FR_LABEL:
517 case LDP_TLV_EXTD_STATUS:
518 case LDP_TLV_RETURNED_PDU:
519 case LDP_TLV_RETURNED_MSG:
520 case LDP_TLV_ATM_SESSION_PARM:
521 case LDP_TLV_FR_SESSION_PARM:
522 case LDP_TLV_LABEL_REQUEST_MSG_ID:
523
524 default:
525 if (vflag <= 1)
526 print_unknown_data(gndo,tptr,"\n\t ",tlv_tlen);
527 break;
528 }
529 return(tlv_len+4); /* Type & Length fields not included */
530
531 trunc:
532 printf("\n\t\t packet exceeded snapshot");
533 return 0;
534
535 badtlv:
536 printf("\n\t\t TLV contents go past end of TLV");
537 return(tlv_len+4); /* Type & Length fields not included */
538 }
539
540 void
541 ldp_print(register const u_char *pptr, register u_int len) {
542
543 int processed;
544 while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
545 processed = ldp_msg_print(pptr);
546 if (processed == 0)
547 return;
548 len -= processed;
549 pptr += processed;
550 }
551 }
552
553
554 int
555 ldp_msg_print(register const u_char *pptr) {
556
557 const struct ldp_common_header *ldp_com_header;
558 const struct ldp_msg_header *ldp_msg_header;
559 const u_char *tptr,*msg_tptr;
560 u_short tlen;
561 u_short pdu_len,msg_len,msg_type,msg_tlen;
562 int hexdump,processed;
563
564 tptr=pptr;
565 ldp_com_header = (const struct ldp_common_header *)pptr;
566 TCHECK(*ldp_com_header);
567
568 /*
569 * Sanity checking of the header.
570 */
571 if (EXTRACT_16BITS(&ldp_com_header->version) != LDP_VERSION) {
572 printf("%sLDP version %u packet not supported",
573 (vflag < 1) ? "" : "\n\t",
574 EXTRACT_16BITS(&ldp_com_header->version));
575 return 0;
576 }
577
578 /* print the LSR-ID, label-space & length */
579 pdu_len = EXTRACT_16BITS(&ldp_com_header->pdu_length);
580 printf("%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
581 (vflag < 1) ? "" : "\n\t",
582 ipaddr_string(&ldp_com_header->lsr_id),
583 EXTRACT_16BITS(&ldp_com_header->label_space),
584 pdu_len);
585
586 /* bail out if non-verbose */
587 if (vflag < 1)
588 return 0;
589
590 /* ok they seem to want to know everything - lets fully decode it */
591 tlen=pdu_len;
592
593 tptr += sizeof(const struct ldp_common_header);
594 tlen -= sizeof(const struct ldp_common_header)-4; /* Type & Length fields not included */
595
596 while(tlen>0) {
597 /* did we capture enough for fully decoding the msg header ? */
598 TCHECK2(*tptr, sizeof(struct ldp_msg_header));
599
600 ldp_msg_header = (const struct ldp_msg_header *)tptr;
601 msg_len=EXTRACT_16BITS(ldp_msg_header->length);
602 msg_type=LDP_MASK_MSG_TYPE(EXTRACT_16BITS(ldp_msg_header->type));
603
604 /* FIXME vendor private / experimental check */
605 printf("\n\t %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
606 tok2str(ldp_msg_values,
607 "Unknown",
608 msg_type),
609 msg_type,
610 msg_len,
611 EXTRACT_32BITS(&ldp_msg_header->id),
612 LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_msg_header->type)) ? "continue processing" : "ignore");
613
614 if (msg_len == 0) /* infinite loop protection */
615 return 0;
616
617 msg_tptr=tptr+sizeof(struct ldp_msg_header);
618 msg_tlen=msg_len-sizeof(struct ldp_msg_header)+4; /* Type & Length fields not included */
619
620 /* did we capture enough for fully decoding the message ? */
621 TCHECK2(*tptr, msg_len);
622 hexdump=FALSE;
623
624 switch(msg_type) {
625
626 case LDP_MSG_NOTIF:
627 case LDP_MSG_HELLO:
628 case LDP_MSG_INIT:
629 case LDP_MSG_KEEPALIVE:
630 case LDP_MSG_ADDRESS:
631 case LDP_MSG_LABEL_MAPPING:
632 case LDP_MSG_ADDRESS_WITHDRAW:
633 case LDP_MSG_LABEL_WITHDRAW:
634 while(msg_tlen >= 4) {
635 processed = ldp_tlv_print(msg_tptr);
636 if (processed == 0)
637 break;
638 msg_tlen-=processed;
639 msg_tptr+=processed;
640 }
641 break;
642
643 /*
644 * FIXME those are the defined messages that lack a decoder
645 * you are welcome to contribute code ;-)
646 */
647
648 case LDP_MSG_LABEL_REQUEST:
649 case LDP_MSG_LABEL_RELEASE:
650 case LDP_MSG_LABEL_ABORT_REQUEST:
651
652 default:
653 if (vflag <= 1)
654 print_unknown_data(gndo,msg_tptr,"\n\t ",msg_tlen);
655 break;
656 }
657 /* do we want to see an additionally hexdump ? */
658 if (vflag > 1 || hexdump==TRUE)
659 print_unknown_data(gndo,tptr+sizeof(struct ldp_msg_header),"\n\t ",
660 msg_len);
661
662 tptr += msg_len+4;
663 tlen -= msg_len+4;
664 }
665 return pdu_len+4;
666 trunc:
667 printf("\n\t\t packet exceeded snapshot");
668 return 0;
669 }
670
671 /*
672 * Local Variables:
673 * c-style: whitesmith
674 * c-basic-offset: 8
675 * End:
676 */
[mirror] the TCPdump network dissector