]> The Tcpdump Group git mirrors - tcpdump/blob - print-ldp.c
projects / tcpdump / blob
summary | shortlog | log | commit | commitdiff | tree
history | raw | HEAD
NDOize safeputs() and safeputchar()
[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 #define NETDISSECT_REWORKED
18 #ifdef HAVE_CONFIG_H
19 #include "config.h"
20 #endif
21
22 #include <tcpdump-stdinc.h>
23
24 #include "interface.h"
25 #include "extract.h"
26 #include "addrtoname.h"
27
28 #include "l2vpn.h"
29 #include "af.h"
30
31 /*
32 * ldp common header
33 *
34 * 0 1 2 3
35 * 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
36 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
37 * | Version | PDU Length |
38 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
39 * | LDP Identifier |
40 * + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
41 * | |
42 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
43 *
44 */
45
46 struct ldp_common_header {
47 u_int8_t version[2];
48 u_int8_t pdu_length[2];
49 u_int8_t lsr_id[4];
50 u_int8_t label_space[2];
51 };
52
53 #define LDP_VERSION 1
54
55 /*
56 * ldp message header
57 *
58 * 0 1 2 3
59 * 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
60 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
61 * |U| Message Type | Message Length |
62 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
63 * | Message ID |
64 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
65 * | |
66 * + +
67 * | Mandatory Parameters |
68 * + +
69 * | |
70 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
71 * | |
72 * + +
73 * | Optional Parameters |
74 * + +
75 * | |
76 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
77 */
78
79 struct ldp_msg_header {
80 u_int8_t type[2];
81 u_int8_t length[2];
82 u_int8_t id[4];
83 };
84
85 #define LDP_MASK_MSG_TYPE(x) ((x)&0x7fff)
86 #define LDP_MASK_U_BIT(x) ((x)&0x8000)
87
88 #define LDP_MSG_NOTIF 0x0001
89 #define LDP_MSG_HELLO 0x0100
90 #define LDP_MSG_INIT 0x0200
91 #define LDP_MSG_KEEPALIVE 0x0201
92 #define LDP_MSG_ADDRESS 0x0300
93 #define LDP_MSG_ADDRESS_WITHDRAW 0x0301
94 #define LDP_MSG_LABEL_MAPPING 0x0400
95 #define LDP_MSG_LABEL_REQUEST 0x0401
96 #define LDP_MSG_LABEL_WITHDRAW 0x0402
97 #define LDP_MSG_LABEL_RELEASE 0x0403
98 #define LDP_MSG_LABEL_ABORT_REQUEST 0x0404
99
100 #define LDP_VENDOR_PRIVATE_MIN 0x3e00
101 #define LDP_VENDOR_PRIVATE_MAX 0x3eff
102 #define LDP_EXPERIMENTAL_MIN 0x3f00
103 #define LDP_EXPERIMENTAL_MAX 0x3fff
104
105 static const struct tok ldp_msg_values[] = {
106 { LDP_MSG_NOTIF, "Notification" },
107 { LDP_MSG_HELLO, "Hello" },
108 { LDP_MSG_INIT, "Initialization" },
109 { LDP_MSG_KEEPALIVE, "Keepalive" },
110 { LDP_MSG_ADDRESS, "Address" },
111 { LDP_MSG_ADDRESS_WITHDRAW, "Address Withdraw" },
112 { LDP_MSG_LABEL_MAPPING, "Label Mapping" },
113 { LDP_MSG_LABEL_REQUEST, "Label Request" },
114 { LDP_MSG_LABEL_WITHDRAW, "Label Withdraw" },
115 { LDP_MSG_LABEL_RELEASE, "Label Release" },
116 { LDP_MSG_LABEL_ABORT_REQUEST, "Label Abort Request" },
117 { 0, NULL}
118 };
119
120 #define LDP_MASK_TLV_TYPE(x) ((x)&0x3fff)
121 #define LDP_MASK_F_BIT(x) ((x)&0x4000)
122
123 #define LDP_TLV_FEC 0x0100
124 #define LDP_TLV_ADDRESS_LIST 0x0101
125 #define LDP_TLV_ADDRESS_LIST_AFNUM_LEN 2
126 #define LDP_TLV_HOP_COUNT 0x0103
127 #define LDP_TLV_PATH_VECTOR 0x0104
128 #define LDP_TLV_GENERIC_LABEL 0x0200
129 #define LDP_TLV_ATM_LABEL 0x0201
130 #define LDP_TLV_FR_LABEL 0x0202
131 #define LDP_TLV_STATUS 0x0300
132 #define LDP_TLV_EXTD_STATUS 0x0301
133 #define LDP_TLV_RETURNED_PDU 0x0302
134 #define LDP_TLV_RETURNED_MSG 0x0303
135 #define LDP_TLV_COMMON_HELLO 0x0400
136 #define LDP_TLV_IPV4_TRANSPORT_ADDR 0x0401
137 #define LDP_TLV_CONFIG_SEQ_NUMBER 0x0402
138 #define LDP_TLV_IPV6_TRANSPORT_ADDR 0x0403
139 #define LDP_TLV_COMMON_SESSION 0x0500
140 #define LDP_TLV_ATM_SESSION_PARM 0x0501
141 #define LDP_TLV_FR_SESSION_PARM 0x0502
142 #define LDP_TLV_FT_SESSION 0x0503
143 #define LDP_TLV_LABEL_REQUEST_MSG_ID 0x0600
144 #define LDP_TLV_MTU 0x0601 /* rfc 3988 */
145
146 static const struct tok ldp_tlv_values[] = {
147 { LDP_TLV_FEC, "FEC" },
148 { LDP_TLV_ADDRESS_LIST, "Address List" },
149 { LDP_TLV_HOP_COUNT, "Hop Count" },
150 { LDP_TLV_PATH_VECTOR, "Path Vector" },
151 { LDP_TLV_GENERIC_LABEL, "Generic Label" },
152 { LDP_TLV_ATM_LABEL, "ATM Label" },
153 { LDP_TLV_FR_LABEL, "Frame-Relay Label" },
154 { LDP_TLV_STATUS, "Status" },
155 { LDP_TLV_EXTD_STATUS, "Extended Status" },
156 { LDP_TLV_RETURNED_PDU, "Returned PDU" },
157 { LDP_TLV_RETURNED_MSG, "Returned Message" },
158 { LDP_TLV_COMMON_HELLO, "Common Hello Parameters" },
159 { LDP_TLV_IPV4_TRANSPORT_ADDR, "IPv4 Transport Address" },
160 { LDP_TLV_CONFIG_SEQ_NUMBER, "Configuration Sequence Number" },
161 { LDP_TLV_IPV6_TRANSPORT_ADDR, "IPv6 Transport Address" },
162 { LDP_TLV_COMMON_SESSION, "Common Session Parameters" },
163 { LDP_TLV_ATM_SESSION_PARM, "ATM Session Parameters" },
164 { LDP_TLV_FR_SESSION_PARM, "Frame-Relay Session Parameters" },
165 { LDP_TLV_FT_SESSION, "Fault-Tolerant Session Parameters" },
166 { LDP_TLV_LABEL_REQUEST_MSG_ID, "Label Request Message ID" },
167 { LDP_TLV_MTU, "MTU" },
168 { 0, NULL}
169 };
170
171 #define LDP_FEC_WILDCARD 0x01
172 #define LDP_FEC_PREFIX 0x02
173 #define LDP_FEC_HOSTADDRESS 0x03
174 /* From RFC 4906; should probably be updated to RFC 4447 (e.g., VC -> PW) */
175 #define LDP_FEC_MARTINI_VC 0x80
176
177 static const struct tok ldp_fec_values[] = {
178 { LDP_FEC_WILDCARD, "Wildcard" },
179 { LDP_FEC_PREFIX, "Prefix" },
180 { LDP_FEC_HOSTADDRESS, "Host address" },
181 { LDP_FEC_MARTINI_VC, "Martini VC" },
182 { 0, NULL}
183 };
184
185 #define LDP_FEC_MARTINI_IFPARM_MTU 0x01
186 #define LDP_FEC_MARTINI_IFPARM_DESC 0x03
187 #define LDP_FEC_MARTINI_IFPARM_VCCV 0x0c
188
189 static const struct tok ldp_fec_martini_ifparm_values[] = {
190 { LDP_FEC_MARTINI_IFPARM_MTU, "MTU" },
191 { LDP_FEC_MARTINI_IFPARM_DESC, "Description" },
192 { LDP_FEC_MARTINI_IFPARM_VCCV, "VCCV" },
193 { 0, NULL}
194 };
195
196 /* draft-ietf-pwe3-vccv-04.txt */
197 static const struct tok ldp_fec_martini_ifparm_vccv_cc_values[] = {
198 { 0x01, "PWE3 control word" },
199 { 0x02, "MPLS Router Alert Label" },
200 { 0x04, "MPLS inner label TTL = 1" },
201 { 0, NULL}
202 };
203
204 /* draft-ietf-pwe3-vccv-04.txt */
205 static const struct tok ldp_fec_martini_ifparm_vccv_cv_values[] = {
206 { 0x01, "ICMP Ping" },
207 { 0x02, "LSP Ping" },
208 { 0x04, "BFD" },
209 { 0, NULL}
210 };
211
212 static int ldp_msg_print(netdissect_options *, register const u_char *);
213
214 /*
215 * ldp tlv header
216 *
217 * 0 1 2 3
218 * 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
219 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
220 * |U|F| Type | Length |
221 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
222 * | |
223 * | Value |
224 * ~ ~
225 * | |
226 * | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
227 * | |
228 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
229 */
230
231 #define TLV_TCHECK(minlen) \
232 ND_TCHECK2(*tptr, minlen); if (tlv_tlen < minlen) goto badtlv;
233
234 static int
235 ldp_tlv_print(netdissect_options *ndo,
236 register const u_char *tptr) {
237
238 struct ldp_tlv_header {
239 u_int8_t type[2];
240 u_int8_t length[2];
241 };
242
243 const struct ldp_tlv_header *ldp_tlv_header;
244 u_short tlv_type,tlv_len,tlv_tlen,af,ft_flags;
245 u_char fec_type;
246 u_int ui,vc_info_len, vc_info_tlv_type, vc_info_tlv_len,idx;
247 char buf[100];
248 int i;
249
250 ldp_tlv_header = (const struct ldp_tlv_header *)tptr;
251 tlv_len=EXTRACT_16BITS(ldp_tlv_header->length);
252 tlv_tlen=tlv_len;
253 tlv_type=LDP_MASK_TLV_TYPE(EXTRACT_16BITS(ldp_tlv_header->type));
254
255 /* FIXME vendor private / experimental check */
256 ND_PRINT((ndo, "\n\t %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]",
257 tok2str(ldp_tlv_values,
258 "Unknown",
259 tlv_type),
260 tlv_type,
261 tlv_len,
262 LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "continue processing" : "ignore",
263 LDP_MASK_F_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "do" : "don't"));
264
265 tptr+=sizeof(struct ldp_tlv_header);
266
267 switch(tlv_type) {
268
269 case LDP_TLV_COMMON_HELLO:
270 TLV_TCHECK(4);
271 ND_PRINT((ndo, "\n\t Hold Time: %us, Flags: [%s Hello%s]",
272 EXTRACT_16BITS(tptr),
273 (EXTRACT_16BITS(tptr+2)&0x8000) ? "Targeted" : "Link",
274 (EXTRACT_16BITS(tptr+2)&0x4000) ? ", Request for targeted Hellos" : ""));
275 break;
276
277 case LDP_TLV_IPV4_TRANSPORT_ADDR:
278 TLV_TCHECK(4);
279 ND_PRINT((ndo, "\n\t IPv4 Transport Address: %s", ipaddr_string(tptr)));
280 break;
281 #ifdef INET6
282 case LDP_TLV_IPV6_TRANSPORT_ADDR:
283 TLV_TCHECK(16);
284 ND_PRINT((ndo, "\n\t IPv6 Transport Address: %s", ip6addr_string(tptr)));
285 break;
286 #endif
287 case LDP_TLV_CONFIG_SEQ_NUMBER:
288 TLV_TCHECK(4);
289 ND_PRINT((ndo, "\n\t Sequence Number: %u", EXTRACT_32BITS(tptr)));
290 break;
291
292 case LDP_TLV_ADDRESS_LIST:
293 TLV_TCHECK(LDP_TLV_ADDRESS_LIST_AFNUM_LEN);
294 af = EXTRACT_16BITS(tptr);
295 tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
296 tlv_tlen -= LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
297 ND_PRINT((ndo, "\n\t Address Family: %s, addresses",
298 tok2str(af_values, "Unknown (%u)", af)));
299 switch (af) {
300 case AFNUM_INET:
301 while(tlv_tlen >= sizeof(struct in_addr)) {
302 ND_TCHECK2(*tptr, sizeof(struct in_addr));
303 ND_PRINT((ndo, " %s", ipaddr_string(tptr)));
304 tlv_tlen-=sizeof(struct in_addr);
305 tptr+=sizeof(struct in_addr);
306 }
307 break;
308 #ifdef INET6
309 case AFNUM_INET6:
310 while(tlv_tlen >= sizeof(struct in6_addr)) {
311 ND_TCHECK2(*tptr, sizeof(struct in6_addr));
312 ND_PRINT((ndo, " %s", ip6addr_string(tptr)));
313 tlv_tlen-=sizeof(struct in6_addr);
314 tptr+=sizeof(struct in6_addr);
315 }
316 break;
317 #endif
318 default:
319 /* unknown AF */
320 break;
321 }
322 break;
323
324 case LDP_TLV_COMMON_SESSION:
325 TLV_TCHECK(8);
326 ND_PRINT((ndo, "\n\t Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
327 EXTRACT_16BITS(tptr), EXTRACT_16BITS(tptr+2),
328 (EXTRACT_16BITS(tptr+6)&0x8000) ? "On Demand" : "Unsolicited",
329 (EXTRACT_16BITS(tptr+6)&0x4000) ? "Enabled" : "Disabled"
330 ));
331 break;
332
333 case LDP_TLV_FEC:
334 TLV_TCHECK(1);
335 fec_type = *tptr;
336 ND_PRINT((ndo, "\n\t %s FEC (0x%02x)",
337 tok2str(ldp_fec_values, "Unknown", fec_type),
338 fec_type));
339
340 tptr+=1;
341 tlv_tlen-=1;
342 switch(fec_type) {
343
344 case LDP_FEC_WILDCARD:
345 break;
346 case LDP_FEC_PREFIX:
347 TLV_TCHECK(2);
348 af = EXTRACT_16BITS(tptr);
349 tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
350 tlv_tlen-=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
351 if (af == AFNUM_INET) {
352 i=decode_prefix4(ndo, tptr, tlv_tlen, buf, sizeof(buf));
353 if (i == -2)
354 goto trunc;
355 if (i == -3)
356 ND_PRINT((ndo, ": IPv4 prefix (goes past end of TLV)"));
357 else if (i == -1)
358 ND_PRINT((ndo, ": IPv4 prefix (invalid length)"));
359 else
360 ND_PRINT((ndo, ": IPv4 prefix %s", buf));
361 }
362 #ifdef INET6
363 else if (af == AFNUM_INET6) {
364 i=decode_prefix6(ndo, tptr, tlv_tlen, buf, sizeof(buf));
365 if (i == -2)
366 goto trunc;
367 if (i == -3)
368 ND_PRINT((ndo, ": IPv4 prefix (goes past end of TLV)"));
369 else if (i == -1)
370 ND_PRINT((ndo, ": IPv6 prefix (invalid length)"));
371 else
372 ND_PRINT((ndo, ": IPv6 prefix %s", buf));
373 }
374 #endif
375 else
376 ND_PRINT((ndo, ": Address family %u prefix", af));
377 break;
378 case LDP_FEC_HOSTADDRESS:
379 break;
380 case LDP_FEC_MARTINI_VC:
381 /*
382 * According to RFC 4908, the VC info Length field can be zero,
383 * in which case not only are there no interface parameters,
384 * there's no VC ID.
385 */
386 TLV_TCHECK(7);
387 vc_info_len = *(tptr+2);
388
389 if (vc_info_len == 0) {
390 ND_PRINT((ndo, ": %s, %scontrol word, group-ID %u, VC-info-length: %u",
391 tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
392 EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
393 EXTRACT_32BITS(tptr+3),
394 vc_info_len));
395 break;
396 }
397
398 /* Make sure we have the VC ID as well */
399 TLV_TCHECK(11);
400 ND_PRINT((ndo, ": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
401 tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
402 EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
403 EXTRACT_32BITS(tptr+3),
404 EXTRACT_32BITS(tptr+7),
405 vc_info_len));
406 if (vc_info_len < 4)
407 goto trunc; /* minimum 4, for the VC ID */
408 vc_info_len -= 4; /* subtract out the VC ID, giving the length of the interface parameters */
409
410 /* Skip past the fixed information and the VC ID */
411 tptr+=11;
412 tlv_tlen-=11;
413 TLV_TCHECK(vc_info_len);
414
415 while (vc_info_len > 2) {
416 vc_info_tlv_type = *tptr;
417 vc_info_tlv_len = *(tptr+1);
418 if (vc_info_tlv_len < 2)
419 break;
420 if (vc_info_len < vc_info_tlv_len)
421 break;
422
423 ND_PRINT((ndo, "\n\t\tInterface Parameter: %s (0x%02x), len %u",
424 tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
425 vc_info_tlv_type,
426 vc_info_tlv_len));
427
428 switch(vc_info_tlv_type) {
429 case LDP_FEC_MARTINI_IFPARM_MTU:
430 ND_PRINT((ndo, ": %u", EXTRACT_16BITS(tptr+2)));
431 break;
432
433 case LDP_FEC_MARTINI_IFPARM_DESC:
434 ND_PRINT((ndo, ": "));
435 for (idx = 2; idx < vc_info_tlv_len; idx++)
436 safeputchar(ndo, *(tptr + idx));
437 break;
438
439 case LDP_FEC_MARTINI_IFPARM_VCCV:
440 ND_PRINT((ndo, "\n\t\t Control Channels (0x%02x) = [%s]",
441 *(tptr+2),
442 bittok2str(ldp_fec_martini_ifparm_vccv_cc_values, "none", *(tptr+2))));
443 ND_PRINT((ndo, "\n\t\t CV Types (0x%02x) = [%s]",
444 *(tptr+3),
445 bittok2str(ldp_fec_martini_ifparm_vccv_cv_values, "none", *(tptr+3))));
446 break;
447
448 default:
449 print_unknown_data(ndo, tptr+2, "\n\t\t ", vc_info_tlv_len-2);
450 break;
451 }
452
453 vc_info_len -= vc_info_tlv_len;
454 tptr += vc_info_tlv_len;
455 }
456 break;
457 }
458
459 break;
460
461 case LDP_TLV_GENERIC_LABEL:
462 TLV_TCHECK(4);
463 ND_PRINT((ndo, "\n\t Label: %u", EXTRACT_32BITS(tptr) & 0xfffff));
464 break;
465
466 case LDP_TLV_STATUS:
467 TLV_TCHECK(8);
468 ui = EXTRACT_32BITS(tptr);
469 tptr+=4;
470 ND_PRINT((ndo, "\n\t Status: 0x%02x, Flags: [%s and %s forward]",
471 ui&0x3fffffff,
472 ui&0x80000000 ? "Fatal error" : "Advisory Notification",
473 ui&0x40000000 ? "do" : "don't"));
474 ui = EXTRACT_32BITS(tptr);
475 tptr+=4;
476 if (ui)
477 ND_PRINT((ndo, ", causing Message ID: 0x%08x", ui));
478 break;
479
480 case LDP_TLV_FT_SESSION:
481 TLV_TCHECK(8);
482 ft_flags = EXTRACT_16BITS(tptr);
483 ND_PRINT((ndo, "\n\t Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
484 ft_flags&0x8000 ? "" : "No ",
485 ft_flags&0x8 ? "" : "Don't ",
486 ft_flags&0x4 ? "" : "No ",
487 ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels",
488 ft_flags&0x1 ? "" : "Don't "));
489 tptr+=4;
490 ui = EXTRACT_32BITS(tptr);
491 if (ui)
492 ND_PRINT((ndo, ", Reconnect Timeout: %ums", ui));
493 tptr+=4;
494 ui = EXTRACT_32BITS(tptr);
495 if (ui)
496 ND_PRINT((ndo, ", Recovery Time: %ums", ui));
497 break;
498
499 case LDP_TLV_MTU:
500 TLV_TCHECK(2);
501 ND_PRINT((ndo, "\n\t MTU: %u", EXTRACT_16BITS(tptr)));
502 break;
503
504
505 /*
506 * FIXME those are the defined TLVs that lack a decoder
507 * you are welcome to contribute code ;-)
508 */
509
510 case LDP_TLV_HOP_COUNT:
511 case LDP_TLV_PATH_VECTOR:
512 case LDP_TLV_ATM_LABEL:
513 case LDP_TLV_FR_LABEL:
514 case LDP_TLV_EXTD_STATUS:
515 case LDP_TLV_RETURNED_PDU:
516 case LDP_TLV_RETURNED_MSG:
517 case LDP_TLV_ATM_SESSION_PARM:
518 case LDP_TLV_FR_SESSION_PARM:
519 case LDP_TLV_LABEL_REQUEST_MSG_ID:
520
521 default:
522 if (ndo->ndo_vflag <= 1)
523 print_unknown_data(ndo, tptr, "\n\t ", tlv_tlen);
524 break;
525 }
526 return(tlv_len+4); /* Type & Length fields not included */
527
528 trunc:
529 ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
530 return 0;
531
532 badtlv:
533 ND_PRINT((ndo, "\n\t\t TLV contents go past end of TLV"));
534 return(tlv_len+4); /* Type & Length fields not included */
535 }
536
537 void
538 ldp_print(netdissect_options *ndo,
539 register const u_char *pptr, register u_int len) {
540
541 int processed;
542 while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
543 processed = ldp_msg_print(ndo, pptr);
544 if (processed == 0)
545 return;
546 len -= processed;
547 pptr += processed;
548 }
549 }
550
551 static int
552 ldp_msg_print(netdissect_options *ndo,
553 register const u_char *pptr) {
554
555 const struct ldp_common_header *ldp_com_header;
556 const struct ldp_msg_header *ldp_msg_header;
557 const u_char *tptr,*msg_tptr;
558 u_short tlen;
559 u_short pdu_len,msg_len,msg_type,msg_tlen;
560 int hexdump,processed;
561
562 tptr=pptr;
563 ldp_com_header = (const struct ldp_common_header *)pptr;
564 ND_TCHECK(*ldp_com_header);
565
566 /*
567 * Sanity checking of the header.
568 */
569 if (EXTRACT_16BITS(&ldp_com_header->version) != LDP_VERSION) {
570 ND_PRINT((ndo, "%sLDP version %u packet not supported",
571 (ndo->ndo_vflag < 1) ? "" : "\n\t",
572 EXTRACT_16BITS(&ldp_com_header->version)));
573 return 0;
574 }
575
576 /* print the LSR-ID, label-space & length */
577 pdu_len = EXTRACT_16BITS(&ldp_com_header->pdu_length);
578 ND_PRINT((ndo, "%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
579 (ndo->ndo_vflag < 1) ? "" : "\n\t",
580 ipaddr_string(&ldp_com_header->lsr_id),
581 EXTRACT_16BITS(&ldp_com_header->label_space),
582 pdu_len));
583
584 /* bail out if non-verbose */
585 if (ndo->ndo_vflag < 1)
586 return 0;
587
588 /* ok they seem to want to know everything - lets fully decode it */
589 tlen=pdu_len;
590
591 tptr += sizeof(const struct ldp_common_header);
592 tlen -= sizeof(const struct ldp_common_header)-4; /* Type & Length fields not included */
593
594 while(tlen>0) {
595 /* did we capture enough for fully decoding the msg header ? */
596 ND_TCHECK2(*tptr, sizeof(struct ldp_msg_header));
597
598 ldp_msg_header = (const struct ldp_msg_header *)tptr;
599 msg_len=EXTRACT_16BITS(ldp_msg_header->length);
600 msg_type=LDP_MASK_MSG_TYPE(EXTRACT_16BITS(ldp_msg_header->type));
601
602 /* FIXME vendor private / experimental check */
603 ND_PRINT((ndo, "\n\t %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
604 tok2str(ldp_msg_values,
605 "Unknown",
606 msg_type),
607 msg_type,
608 msg_len,
609 EXTRACT_32BITS(&ldp_msg_header->id),
610 LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_msg_header->type)) ? "continue processing" : "ignore"));
611
612 if (msg_len == 0) /* infinite loop protection */
613 return 0;
614
615 msg_tptr=tptr+sizeof(struct ldp_msg_header);
616 msg_tlen=msg_len-sizeof(struct ldp_msg_header)+4; /* Type & Length fields not included */
617
618 /* did we capture enough for fully decoding the message ? */
619 ND_TCHECK2(*tptr, msg_len);
620 hexdump=FALSE;
621
622 switch(msg_type) {
623
624 case LDP_MSG_NOTIF:
625 case LDP_MSG_HELLO:
626 case LDP_MSG_INIT:
627 case LDP_MSG_KEEPALIVE:
628 case LDP_MSG_ADDRESS:
629 case LDP_MSG_LABEL_MAPPING:
630 case LDP_MSG_ADDRESS_WITHDRAW:
631 case LDP_MSG_LABEL_WITHDRAW:
632 while(msg_tlen >= 4) {
633 processed = ldp_tlv_print(ndo, msg_tptr);
634 if (processed == 0)
635 break;
636 msg_tlen-=processed;
637 msg_tptr+=processed;
638 }
639 break;
640
641 /*
642 * FIXME those are the defined messages that lack a decoder
643 * you are welcome to contribute code ;-)
644 */
645
646 case LDP_MSG_LABEL_REQUEST:
647 case LDP_MSG_LABEL_RELEASE:
648 case LDP_MSG_LABEL_ABORT_REQUEST:
649
650 default:
651 if (ndo->ndo_vflag <= 1)
652 print_unknown_data(ndo, msg_tptr, "\n\t ", msg_tlen);
653 break;
654 }
655 /* do we want to see an additionally hexdump ? */
656 if (ndo->ndo_vflag > 1 || hexdump==TRUE)
657 print_unknown_data(ndo, tptr+sizeof(struct ldp_msg_header), "\n\t ",
658 msg_len);
659
660 tptr += msg_len+4;
661 tlen -= msg_len+4;
662 }
663 return pdu_len+4;
664 trunc:
665 ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
666 return 0;
667 }
668
669 /*
670 * Local Variables:
671 * c-style: whitesmith
672 * c-basic-offset: 8
673 * End:
674 */
[mirror] the TCPdump network dissector