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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 static const char tstr[] = " [|ldp]";
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 nd_uint16_t version;
51 nd_uint16_t pdu_length;
52 nd_ipv4 lsr_id;
53 nd_uint16_t label_space;
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 nd_uint16_t type;
84 nd_uint16_t length;
85 nd_uint32_t id;
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 static int ldp_pdu_print(netdissect_options *, const u_char *);
216
217 /*
218 * ldp tlv header
219 *
220 * 0 1 2 3
221 * 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
222 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
223 * |U|F| Type | Length |
224 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
225 * | |
226 * | Value |
227 * ~ ~
228 * | |
229 * | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
230 * | |
231 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
232 */
233
234 #define TLV_TCHECK(minlen) \
235 ND_TCHECK_LEN(tptr, minlen); if (tlv_tlen < minlen) goto badtlv;
236
237 static int
238 ldp_tlv_print(netdissect_options *ndo,
239 const u_char *tptr,
240 u_short msg_tlen)
241 {
242 struct ldp_tlv_header {
243 nd_uint16_t type;
244 nd_uint16_t length;
245 };
246
247 const struct ldp_tlv_header *ldp_tlv_header;
248 u_short tlv_type,tlv_len,tlv_tlen,af,ft_flags;
249 u_char fec_type;
250 u_int ui,vc_info_len, vc_info_tlv_type, vc_info_tlv_len,idx;
251 char buf[100];
252 int i;
253
254 ldp_tlv_header = (const struct ldp_tlv_header *)tptr;
255 ND_TCHECK_SIZE(ldp_tlv_header);
256 tlv_len=EXTRACT_BE_U_2(ldp_tlv_header->length);
257 if (tlv_len + 4 > msg_tlen) {
258 ND_PRINT("\n\t\t TLV contents go past end of message");
259 return 0;
260 }
261 tlv_tlen=tlv_len;
262 tlv_type=LDP_MASK_TLV_TYPE(EXTRACT_BE_U_2(ldp_tlv_header->type));
263
264 /* FIXME vendor private / experimental check */
265 ND_PRINT("\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_BE_U_2(ldp_tlv_header->type)) ? "continue processing" : "ignore",
272 LDP_MASK_F_BIT(EXTRACT_BE_U_2(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 TLV_TCHECK(4);
280 ND_PRINT("\n\t Hold Time: %us, Flags: [%s Hello%s]",
281 EXTRACT_BE_U_2(tptr),
282 (EXTRACT_BE_U_2(tptr + 2)&0x8000) ? "Targeted" : "Link",
283 (EXTRACT_BE_U_2(tptr + 2)&0x4000) ? ", Request for targeted Hellos" : "");
284 break;
285
286 case LDP_TLV_IPV4_TRANSPORT_ADDR:
287 TLV_TCHECK(4);
288 ND_PRINT("\n\t IPv4 Transport Address: %s", ipaddr_string(ndo, tptr));
289 break;
290 case LDP_TLV_IPV6_TRANSPORT_ADDR:
291 TLV_TCHECK(16);
292 ND_PRINT("\n\t IPv6 Transport Address: %s", ip6addr_string(ndo, tptr));
293 break;
294 case LDP_TLV_CONFIG_SEQ_NUMBER:
295 TLV_TCHECK(4);
296 ND_PRINT("\n\t Sequence Number: %u", EXTRACT_BE_U_4(tptr));
297 break;
298
299 case LDP_TLV_ADDRESS_LIST:
300 TLV_TCHECK(LDP_TLV_ADDRESS_LIST_AFNUM_LEN);
301 af = EXTRACT_BE_U_2(tptr);
302 tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
303 tlv_tlen -= LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
304 ND_PRINT("\n\t Address Family: %s, addresses",
305 tok2str(af_values, "Unknown (%u)", af));
306 switch (af) {
307 case AFNUM_INET:
308 while(tlv_tlen >= sizeof(nd_ipv4)) {
309 ND_TCHECK_LEN(tptr, sizeof(nd_ipv4));
310 ND_PRINT(" %s", ipaddr_string(ndo, tptr));
311 tlv_tlen-=sizeof(nd_ipv4);
312 tptr+=sizeof(nd_ipv4);
313 }
314 break;
315 case AFNUM_INET6:
316 while(tlv_tlen >= sizeof(nd_ipv6)) {
317 ND_TCHECK_LEN(tptr, sizeof(nd_ipv6));
318 ND_PRINT(" %s", ip6addr_string(ndo, tptr));
319 tlv_tlen-=sizeof(nd_ipv6);
320 tptr+=sizeof(nd_ipv6);
321 }
322 break;
323 default:
324 /* unknown AF */
325 break;
326 }
327 break;
328
329 case LDP_TLV_COMMON_SESSION:
330 TLV_TCHECK(8);
331 ND_PRINT("\n\t Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
332 EXTRACT_BE_U_2(tptr), EXTRACT_BE_U_2(tptr + 2),
333 (EXTRACT_BE_U_2(tptr + 6)&0x8000) ? "On Demand" : "Unsolicited",
334 (EXTRACT_BE_U_2(tptr + 6)&0x4000) ? "Enabled" : "Disabled"
335 );
336 break;
337
338 case LDP_TLV_FEC:
339 TLV_TCHECK(1);
340 fec_type = EXTRACT_U_1(tptr);
341 ND_PRINT("\n\t %s FEC (0x%02x)",
342 tok2str(ldp_fec_values, "Unknown", fec_type),
343 fec_type);
344
345 tptr+=1;
346 tlv_tlen-=1;
347 switch(fec_type) {
348
349 case LDP_FEC_WILDCARD:
350 break;
351 case LDP_FEC_PREFIX:
352 TLV_TCHECK(2);
353 af = EXTRACT_BE_U_2(tptr);
354 tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
355 tlv_tlen-=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
356 if (af == AFNUM_INET) {
357 i=decode_prefix4(ndo, tptr, tlv_tlen, buf, sizeof(buf));
358 if (i == -2)
359 goto trunc;
360 if (i == -3)
361 ND_PRINT(": IPv4 prefix (goes past end of TLV)");
362 else if (i == -1)
363 ND_PRINT(": IPv4 prefix (invalid length)");
364 else
365 ND_PRINT(": IPv4 prefix %s", buf);
366 }
367 else if (af == AFNUM_INET6) {
368 i=decode_prefix6(ndo, tptr, tlv_tlen, buf, sizeof(buf));
369 if (i == -2)
370 goto trunc;
371 if (i == -3)
372 ND_PRINT(": IPv4 prefix (goes past end of TLV)");
373 else if (i == -1)
374 ND_PRINT(": IPv6 prefix (invalid length)");
375 else
376 ND_PRINT(": IPv6 prefix %s", buf);
377 }
378 else
379 ND_PRINT(": Address family %u prefix", af);
380 break;
381 case LDP_FEC_HOSTADDRESS:
382 break;
383 case LDP_FEC_MARTINI_VC:
384 /*
385 * We assume the type was supposed to be one of the MPLS
386 * Pseudowire Types.
387 */
388 TLV_TCHECK(7);
389 vc_info_len = EXTRACT_U_1(tptr + 2);
390
391 /*
392 * According to RFC 4908, the VC info Length field can be zero,
393 * in which case not only are there no interface parameters,
394 * there's no VC ID.
395 */
396 if (vc_info_len == 0) {
397 ND_PRINT(": %s, %scontrol word, group-ID %u, VC-info-length: %u",
398 tok2str(mpls_pw_types_values, "Unknown", EXTRACT_BE_U_2(tptr)&0x7fff),
399 EXTRACT_BE_U_2(tptr)&0x8000 ? "" : "no ",
400 EXTRACT_BE_U_4(tptr + 3),
401 vc_info_len);
402 break;
403 }
404
405 /* Make sure we have the VC ID as well */
406 TLV_TCHECK(11);
407 ND_PRINT(": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
408 tok2str(mpls_pw_types_values, "Unknown", EXTRACT_BE_U_2(tptr)&0x7fff),
409 EXTRACT_BE_U_2(tptr)&0x8000 ? "" : "no ",
410 EXTRACT_BE_U_4(tptr + 3),
411 EXTRACT_BE_U_4(tptr + 7),
412 vc_info_len);
413 if (vc_info_len < 4) {
414 /* minimum 4, for the VC ID */
415 ND_PRINT(" (invalid, < 4");
416 return(tlv_len+4); /* Type & Length fields not included */
417 }
418 vc_info_len -= 4; /* subtract out the VC ID, giving the length of the interface parameters */
419
420 /* Skip past the fixed information and the VC ID */
421 tptr+=11;
422 tlv_tlen-=11;
423 TLV_TCHECK(vc_info_len);
424
425 while (vc_info_len > 2) {
426 vc_info_tlv_type = EXTRACT_U_1(tptr);
427 vc_info_tlv_len = EXTRACT_U_1(tptr + 1);
428 if (vc_info_tlv_len < 2)
429 break;
430 if (vc_info_len < vc_info_tlv_len)
431 break;
432
433 ND_PRINT("\n\t\tInterface Parameter: %s (0x%02x), len %u",
434 tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
435 vc_info_tlv_type,
436 vc_info_tlv_len);
437
438 switch(vc_info_tlv_type) {
439 case LDP_FEC_MARTINI_IFPARM_MTU:
440 ND_PRINT(": %u", EXTRACT_BE_U_2(tptr + 2));
441 break;
442
443 case LDP_FEC_MARTINI_IFPARM_DESC:
444 ND_PRINT(": ");
445 for (idx = 2; idx < vc_info_tlv_len; idx++)
446 safeputchar(ndo, EXTRACT_U_1(tptr + idx));
447 break;
448
449 case LDP_FEC_MARTINI_IFPARM_VCCV:
450 ND_PRINT("\n\t\t Control Channels (0x%02x) = [%s]",
451 EXTRACT_U_1((tptr + 2)),
452 bittok2str(ldp_fec_martini_ifparm_vccv_cc_values, "none", EXTRACT_U_1((tptr + 2))));
453 ND_PRINT("\n\t\t CV Types (0x%02x) = [%s]",
454 EXTRACT_U_1((tptr + 3)),
455 bittok2str(ldp_fec_martini_ifparm_vccv_cv_values, "none", EXTRACT_U_1((tptr + 3))));
456 break;
457
458 default:
459 print_unknown_data(ndo, tptr+2, "\n\t\t ", vc_info_tlv_len-2);
460 break;
461 }
462
463 vc_info_len -= vc_info_tlv_len;
464 tptr += vc_info_tlv_len;
465 }
466 break;
467 }
468
469 break;
470
471 case LDP_TLV_GENERIC_LABEL:
472 TLV_TCHECK(4);
473 ND_PRINT("\n\t Label: %u", EXTRACT_BE_U_4(tptr) & 0xfffff);
474 break;
475
476 case LDP_TLV_STATUS:
477 TLV_TCHECK(8);
478 ui = EXTRACT_BE_U_4(tptr);
479 tptr+=4;
480 ND_PRINT("\n\t Status: 0x%02x, Flags: [%s and %s forward]",
481 ui&0x3fffffff,
482 ui&0x80000000 ? "Fatal error" : "Advisory Notification",
483 ui&0x40000000 ? "do" : "don't");
484 ui = EXTRACT_BE_U_4(tptr);
485 tptr+=4;
486 if (ui)
487 ND_PRINT(", causing Message ID: 0x%08x", ui);
488 break;
489
490 case LDP_TLV_FT_SESSION:
491 TLV_TCHECK(8);
492 ft_flags = EXTRACT_BE_U_2(tptr);
493 ND_PRINT("\n\t Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
494 ft_flags&0x8000 ? "" : "No ",
495 ft_flags&0x8 ? "" : "Don't ",
496 ft_flags&0x4 ? "" : "No ",
497 ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels",
498 ft_flags&0x1 ? "" : "Don't ");
499 tptr+=4;
500 ui = EXTRACT_BE_U_4(tptr);
501 if (ui)
502 ND_PRINT(", Reconnect Timeout: %ums", ui);
503 tptr+=4;
504 ui = EXTRACT_BE_U_4(tptr);
505 if (ui)
506 ND_PRINT(", Recovery Time: %ums", ui);
507 break;
508
509 case LDP_TLV_MTU:
510 TLV_TCHECK(2);
511 ND_PRINT("\n\t MTU: %u", EXTRACT_BE_U_2(tptr));
512 break;
513
514
515 /*
516 * FIXME those are the defined TLVs that lack a decoder
517 * you are welcome to contribute code ;-)
518 */
519
520 case LDP_TLV_HOP_COUNT:
521 case LDP_TLV_PATH_VECTOR:
522 case LDP_TLV_ATM_LABEL:
523 case LDP_TLV_FR_LABEL:
524 case LDP_TLV_EXTD_STATUS:
525 case LDP_TLV_RETURNED_PDU:
526 case LDP_TLV_RETURNED_MSG:
527 case LDP_TLV_ATM_SESSION_PARM:
528 case LDP_TLV_FR_SESSION_PARM:
529 case LDP_TLV_LABEL_REQUEST_MSG_ID:
530
531 default:
532 if (ndo->ndo_vflag <= 1)
533 print_unknown_data(ndo, tptr, "\n\t ", tlv_tlen);
534 break;
535 }
536 return(tlv_len+4); /* Type & Length fields not included */
537
538 trunc:
539 ND_PRINT("%s", tstr);
540 return 0;
541
542 badtlv:
543 ND_PRINT("\n\t\t TLV contents go past end of TLV");
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 int processed;
552 while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
553 processed = ldp_pdu_print(ndo, pptr);
554 if (processed == 0)
555 return;
556 len -= processed;
557 pptr += processed;
558 }
559 }
560
561 static int
562 ldp_pdu_print(netdissect_options *ndo,
563 const u_char *pptr)
564 {
565 const struct ldp_common_header *ldp_com_header;
566 const struct ldp_msg_header *ldp_msg_header;
567 const u_char *tptr,*msg_tptr;
568 u_short tlen;
569 u_short pdu_len,msg_len,msg_type,msg_tlen;
570 int hexdump,processed;
571
572 ldp_com_header = (const struct ldp_common_header *)pptr;
573 ND_TCHECK_SIZE(ldp_com_header);
574
575 /*
576 * Sanity checking of the header.
577 */
578 if (EXTRACT_BE_U_2(ldp_com_header->version) != LDP_VERSION) {
579 ND_PRINT("%sLDP version %u packet not supported",
580 (ndo->ndo_vflag < 1) ? "" : "\n\t",
581 EXTRACT_BE_U_2(ldp_com_header->version));
582 return 0;
583 }
584
585 pdu_len = EXTRACT_BE_U_2(ldp_com_header->pdu_length);
586 if (pdu_len < sizeof(struct ldp_common_header)-4) {
587 /* length too short */
588 ND_PRINT("%sLDP, pdu-length: %u (too short, < %u)",
589 (ndo->ndo_vflag < 1) ? "" : "\n\t",
590 pdu_len,
591 (u_int)(sizeof(struct ldp_common_header)-4));
592 return 0;
593 }
594
595 /* print the LSR-ID, label-space & length */
596 ND_PRINT("%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
597 (ndo->ndo_vflag < 1) ? "" : "\n\t",
598 ipaddr_string(ndo, ldp_com_header->lsr_id),
599 EXTRACT_BE_U_2(ldp_com_header->label_space),
600 pdu_len);
601
602 /* bail out if non-verbose */
603 if (ndo->ndo_vflag < 1)
604 return 0;
605
606 /* ok they seem to want to know everything - lets fully decode it */
607 tptr = pptr + sizeof(struct ldp_common_header);
608 tlen = pdu_len - (sizeof(struct ldp_common_header)-4); /* Type & Length fields not included */
609
610 while(tlen>0) {
611 /* did we capture enough for fully decoding the msg header ? */
612 ND_TCHECK_LEN(tptr, sizeof(struct ldp_msg_header));
613
614 ldp_msg_header = (const struct ldp_msg_header *)tptr;
615 msg_len=EXTRACT_BE_U_2(ldp_msg_header->length);
616 msg_type=LDP_MASK_MSG_TYPE(EXTRACT_BE_U_2(ldp_msg_header->type));
617
618 if (msg_len < sizeof(struct ldp_msg_header)-4) {
619 /* length too short */
620 /* FIXME vendor private / experimental check */
621 ND_PRINT("\n\t %s Message (0x%04x), length: %u (too short, < %u)",
622 tok2str(ldp_msg_values,
623 "Unknown",
624 msg_type),
625 msg_type,
626 msg_len,
627 (u_int)(sizeof(struct ldp_msg_header)-4));
628 return 0;
629 }
630
631 /* FIXME vendor private / experimental check */
632 ND_PRINT("\n\t %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
633 tok2str(ldp_msg_values,
634 "Unknown",
635 msg_type),
636 msg_type,
637 msg_len,
638 EXTRACT_BE_U_4(ldp_msg_header->id),
639 LDP_MASK_U_BIT(EXTRACT_BE_U_2(ldp_msg_header->type)) ? "continue processing" : "ignore");
640
641 msg_tptr=tptr+sizeof(struct ldp_msg_header);
642 msg_tlen=msg_len-(sizeof(struct ldp_msg_header)-4); /* Type & Length fields not included */
643
644 /* did we capture enough for fully decoding the message ? */
645 ND_TCHECK_LEN(tptr, msg_len);
646 hexdump=FALSE;
647
648 switch(msg_type) {
649
650 case LDP_MSG_NOTIF:
651 case LDP_MSG_HELLO:
652 case LDP_MSG_INIT:
653 case LDP_MSG_KEEPALIVE:
654 case LDP_MSG_ADDRESS:
655 case LDP_MSG_LABEL_MAPPING:
656 case LDP_MSG_ADDRESS_WITHDRAW:
657 case LDP_MSG_LABEL_WITHDRAW:
658 while(msg_tlen >= 4) {
659 processed = ldp_tlv_print(ndo, msg_tptr, msg_tlen);
660 if (processed == 0)
661 break;
662 msg_tlen-=processed;
663 msg_tptr+=processed;
664 }
665 break;
666
667 /*
668 * FIXME those are the defined messages that lack a decoder
669 * you are welcome to contribute code ;-)
670 */
671
672 case LDP_MSG_LABEL_REQUEST:
673 case LDP_MSG_LABEL_RELEASE:
674 case LDP_MSG_LABEL_ABORT_REQUEST:
675
676 default:
677 if (ndo->ndo_vflag <= 1)
678 print_unknown_data(ndo, msg_tptr, "\n\t ", msg_tlen);
679 break;
680 }
681 /* do we want to see an additionally hexdump ? */
682 if (ndo->ndo_vflag > 1 || hexdump==TRUE)
683 print_unknown_data(ndo, tptr+sizeof(struct ldp_msg_header), "\n\t ",
684 msg_len);
685
686 tptr += msg_len+4;
687 tlen -= msg_len+4;
688 }
689 return pdu_len+4;
690 trunc:
691 ND_PRINT("%s", tstr);
692 return 0;
693 }
694
695 /*
696 * Local Variables:
697 * c-style: whitesmith
698 * c-basic-offset: 8
699 * End:
700 */
[mirror] the TCPdump network dissector