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[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 /* \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 /*
33 * ldp common header
34 *
35 * 0 1 2 3
36 * 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
37 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
38 * | Version | PDU Length |
39 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
40 * | LDP Identifier |
41 * + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
42 * | |
43 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
44 *
45 */
46
47 struct ldp_common_header {
48 uint8_t version[2];
49 uint8_t pdu_length[2];
50 uint8_t lsr_id[4];
51 uint8_t label_space[2];
52 };
53
54 #define LDP_VERSION 1
55
56 /*
57 * ldp message header
58 *
59 * 0 1 2 3
60 * 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
61 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
62 * |U| Message Type | Message Length |
63 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
64 * | Message ID |
65 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
66 * | |
67 * + +
68 * | Mandatory Parameters |
69 * + +
70 * | |
71 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
72 * | |
73 * + +
74 * | Optional Parameters |
75 * + +
76 * | |
77 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
78 */
79
80 struct ldp_msg_header {
81 uint8_t type[2];
82 uint8_t length[2];
83 uint8_t id[4];
84 };
85
86 #define LDP_MASK_MSG_TYPE(x) ((x)&0x7fff)
87 #define LDP_MASK_U_BIT(x) ((x)&0x8000)
88
89 #define LDP_MSG_NOTIF 0x0001
90 #define LDP_MSG_HELLO 0x0100
91 #define LDP_MSG_INIT 0x0200
92 #define LDP_MSG_KEEPALIVE 0x0201
93 #define LDP_MSG_ADDRESS 0x0300
94 #define LDP_MSG_ADDRESS_WITHDRAW 0x0301
95 #define LDP_MSG_LABEL_MAPPING 0x0400
96 #define LDP_MSG_LABEL_REQUEST 0x0401
97 #define LDP_MSG_LABEL_WITHDRAW 0x0402
98 #define LDP_MSG_LABEL_RELEASE 0x0403
99 #define LDP_MSG_LABEL_ABORT_REQUEST 0x0404
100
101 #define LDP_VENDOR_PRIVATE_MIN 0x3e00
102 #define LDP_VENDOR_PRIVATE_MAX 0x3eff
103 #define LDP_EXPERIMENTAL_MIN 0x3f00
104 #define LDP_EXPERIMENTAL_MAX 0x3fff
105
106 static const struct tok ldp_msg_values[] = {
107 { LDP_MSG_NOTIF, "Notification" },
108 { LDP_MSG_HELLO, "Hello" },
109 { LDP_MSG_INIT, "Initialization" },
110 { LDP_MSG_KEEPALIVE, "Keepalive" },
111 { LDP_MSG_ADDRESS, "Address" },
112 { LDP_MSG_ADDRESS_WITHDRAW, "Address Withdraw" },
113 { LDP_MSG_LABEL_MAPPING, "Label Mapping" },
114 { LDP_MSG_LABEL_REQUEST, "Label Request" },
115 { LDP_MSG_LABEL_WITHDRAW, "Label Withdraw" },
116 { LDP_MSG_LABEL_RELEASE, "Label Release" },
117 { LDP_MSG_LABEL_ABORT_REQUEST, "Label Abort Request" },
118 { 0, NULL}
119 };
120
121 #define LDP_MASK_TLV_TYPE(x) ((x)&0x3fff)
122 #define LDP_MASK_F_BIT(x) ((x)&0x4000)
123
124 #define LDP_TLV_FEC 0x0100
125 #define LDP_TLV_ADDRESS_LIST 0x0101
126 #define LDP_TLV_ADDRESS_LIST_AFNUM_LEN 2
127 #define LDP_TLV_HOP_COUNT 0x0103
128 #define LDP_TLV_PATH_VECTOR 0x0104
129 #define LDP_TLV_GENERIC_LABEL 0x0200
130 #define LDP_TLV_ATM_LABEL 0x0201
131 #define LDP_TLV_FR_LABEL 0x0202
132 #define LDP_TLV_STATUS 0x0300
133 #define LDP_TLV_EXTD_STATUS 0x0301
134 #define LDP_TLV_RETURNED_PDU 0x0302
135 #define LDP_TLV_RETURNED_MSG 0x0303
136 #define LDP_TLV_COMMON_HELLO 0x0400
137 #define LDP_TLV_IPV4_TRANSPORT_ADDR 0x0401
138 #define LDP_TLV_CONFIG_SEQ_NUMBER 0x0402
139 #define LDP_TLV_IPV6_TRANSPORT_ADDR 0x0403
140 #define LDP_TLV_COMMON_SESSION 0x0500
141 #define LDP_TLV_ATM_SESSION_PARM 0x0501
142 #define LDP_TLV_FR_SESSION_PARM 0x0502
143 #define LDP_TLV_FT_SESSION 0x0503
144 #define LDP_TLV_LABEL_REQUEST_MSG_ID 0x0600
145 #define LDP_TLV_MTU 0x0601 /* rfc 3988 */
146
147 static const struct tok ldp_tlv_values[] = {
148 { LDP_TLV_FEC, "FEC" },
149 { LDP_TLV_ADDRESS_LIST, "Address List" },
150 { LDP_TLV_HOP_COUNT, "Hop Count" },
151 { LDP_TLV_PATH_VECTOR, "Path Vector" },
152 { LDP_TLV_GENERIC_LABEL, "Generic Label" },
153 { LDP_TLV_ATM_LABEL, "ATM Label" },
154 { LDP_TLV_FR_LABEL, "Frame-Relay Label" },
155 { LDP_TLV_STATUS, "Status" },
156 { LDP_TLV_EXTD_STATUS, "Extended Status" },
157 { LDP_TLV_RETURNED_PDU, "Returned PDU" },
158 { LDP_TLV_RETURNED_MSG, "Returned Message" },
159 { LDP_TLV_COMMON_HELLO, "Common Hello Parameters" },
160 { LDP_TLV_IPV4_TRANSPORT_ADDR, "IPv4 Transport Address" },
161 { LDP_TLV_CONFIG_SEQ_NUMBER, "Configuration Sequence Number" },
162 { LDP_TLV_IPV6_TRANSPORT_ADDR, "IPv6 Transport Address" },
163 { LDP_TLV_COMMON_SESSION, "Common Session Parameters" },
164 { LDP_TLV_ATM_SESSION_PARM, "ATM Session Parameters" },
165 { LDP_TLV_FR_SESSION_PARM, "Frame-Relay Session Parameters" },
166 { LDP_TLV_FT_SESSION, "Fault-Tolerant Session Parameters" },
167 { LDP_TLV_LABEL_REQUEST_MSG_ID, "Label Request Message ID" },
168 { LDP_TLV_MTU, "MTU" },
169 { 0, NULL}
170 };
171
172 #define LDP_FEC_WILDCARD 0x01
173 #define LDP_FEC_PREFIX 0x02
174 #define LDP_FEC_HOSTADDRESS 0x03
175 /* From RFC 4906; should probably be updated to RFC 4447 (e.g., VC -> PW) */
176 #define LDP_FEC_MARTINI_VC 0x80
177
178 static const struct tok ldp_fec_values[] = {
179 { LDP_FEC_WILDCARD, "Wildcard" },
180 { LDP_FEC_PREFIX, "Prefix" },
181 { LDP_FEC_HOSTADDRESS, "Host address" },
182 { LDP_FEC_MARTINI_VC, "Martini VC" },
183 { 0, NULL}
184 };
185
186 #define LDP_FEC_MARTINI_IFPARM_MTU 0x01
187 #define LDP_FEC_MARTINI_IFPARM_DESC 0x03
188 #define LDP_FEC_MARTINI_IFPARM_VCCV 0x0c
189
190 static const struct tok ldp_fec_martini_ifparm_values[] = {
191 { LDP_FEC_MARTINI_IFPARM_MTU, "MTU" },
192 { LDP_FEC_MARTINI_IFPARM_DESC, "Description" },
193 { LDP_FEC_MARTINI_IFPARM_VCCV, "VCCV" },
194 { 0, NULL}
195 };
196
197 /* draft-ietf-pwe3-vccv-04.txt */
198 static const struct tok ldp_fec_martini_ifparm_vccv_cc_values[] = {
199 { 0x01, "PWE3 control word" },
200 { 0x02, "MPLS Router Alert Label" },
201 { 0x04, "MPLS inner label TTL = 1" },
202 { 0, NULL}
203 };
204
205 /* draft-ietf-pwe3-vccv-04.txt */
206 static const struct tok ldp_fec_martini_ifparm_vccv_cv_values[] = {
207 { 0x01, "ICMP Ping" },
208 { 0x02, "LSP Ping" },
209 { 0x04, "BFD" },
210 { 0, NULL}
211 };
212
213 static int ldp_pdu_print(netdissect_options *, register const u_char *);
214
215 /*
216 * ldp tlv header
217 *
218 * 0 1 2 3
219 * 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
220 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
221 * |U|F| Type | Length |
222 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
223 * | |
224 * | Value |
225 * ~ ~
226 * | |
227 * | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
228 * | |
229 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
230 */
231
232 #define TLV_TCHECK(minlen) \
233 ND_TCHECK2(*tptr, minlen); if (tlv_tlen < minlen) goto badtlv;
234
235 static int
236 ldp_tlv_print(netdissect_options *ndo,
237 register const u_char *tptr,
238 u_short msg_tlen)
239 {
240 struct ldp_tlv_header {
241 uint8_t type[2];
242 uint8_t length[2];
243 };
244
245 const struct ldp_tlv_header *ldp_tlv_header;
246 u_short tlv_type,tlv_len,tlv_tlen,af,ft_flags;
247 u_char fec_type;
248 u_int ui,vc_info_len, vc_info_tlv_type, vc_info_tlv_len,idx;
249 char buf[100];
250 int i;
251
252 ldp_tlv_header = (const struct ldp_tlv_header *)tptr;
253 ND_TCHECK(*ldp_tlv_header);
254 tlv_len=EXTRACT_16BITS(ldp_tlv_header->length);
255 if (tlv_len + 4 > msg_tlen) {
256 ND_PRINT((ndo, "\n\t\t TLV contents go past end of message"));
257 return 0;
258 }
259 tlv_tlen=tlv_len;
260 tlv_type=LDP_MASK_TLV_TYPE(EXTRACT_16BITS(ldp_tlv_header->type));
261
262 /* FIXME vendor private / experimental check */
263 ND_PRINT((ndo, "\n\t %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]",
264 tok2str(ldp_tlv_values,
265 "Unknown",
266 tlv_type),
267 tlv_type,
268 tlv_len,
269 LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "continue processing" : "ignore",
270 LDP_MASK_F_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "do" : "don't"));
271
272 tptr+=sizeof(struct ldp_tlv_header);
273
274 switch(tlv_type) {
275
276 case LDP_TLV_COMMON_HELLO:
277 TLV_TCHECK(4);
278 ND_PRINT((ndo, "\n\t Hold Time: %us, Flags: [%s Hello%s]",
279 EXTRACT_16BITS(tptr),
280 (EXTRACT_16BITS(tptr+2)&0x8000) ? "Targeted" : "Link",
281 (EXTRACT_16BITS(tptr+2)&0x4000) ? ", Request for targeted Hellos" : ""));
282 break;
283
284 case LDP_TLV_IPV4_TRANSPORT_ADDR:
285 TLV_TCHECK(4);
286 ND_PRINT((ndo, "\n\t IPv4 Transport Address: %s", ipaddr_string(ndo, tptr)));
287 break;
288 case LDP_TLV_IPV6_TRANSPORT_ADDR:
289 TLV_TCHECK(16);
290 ND_PRINT((ndo, "\n\t IPv6 Transport Address: %s", ip6addr_string(ndo, tptr)));
291 break;
292 case LDP_TLV_CONFIG_SEQ_NUMBER:
293 TLV_TCHECK(4);
294 ND_PRINT((ndo, "\n\t Sequence Number: %u", EXTRACT_32BITS(tptr)));
295 break;
296
297 case LDP_TLV_ADDRESS_LIST:
298 TLV_TCHECK(LDP_TLV_ADDRESS_LIST_AFNUM_LEN);
299 af = EXTRACT_16BITS(tptr);
300 tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
301 tlv_tlen -= LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
302 ND_PRINT((ndo, "\n\t Address Family: %s, addresses",
303 tok2str(af_values, "Unknown (%u)", af)));
304 switch (af) {
305 case AFNUM_INET:
306 while(tlv_tlen >= sizeof(struct in_addr)) {
307 ND_TCHECK2(*tptr, sizeof(struct in_addr));
308 ND_PRINT((ndo, " %s", ipaddr_string(ndo, tptr)));
309 tlv_tlen-=sizeof(struct in_addr);
310 tptr+=sizeof(struct in_addr);
311 }
312 break;
313 case AFNUM_INET6:
314 while(tlv_tlen >= sizeof(struct in6_addr)) {
315 ND_TCHECK2(*tptr, sizeof(struct in6_addr));
316 ND_PRINT((ndo, " %s", ip6addr_string(ndo, tptr)));
317 tlv_tlen-=sizeof(struct in6_addr);
318 tptr+=sizeof(struct in6_addr);
319 }
320 break;
321 default:
322 /* unknown AF */
323 break;
324 }
325 break;
326
327 case LDP_TLV_COMMON_SESSION:
328 TLV_TCHECK(8);
329 ND_PRINT((ndo, "\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 ND_PRINT((ndo, "\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(ndo, tptr, tlv_tlen, buf, sizeof(buf));
356 if (i == -2)
357 goto trunc;
358 if (i == -3)
359 ND_PRINT((ndo, ": IPv4 prefix (goes past end of TLV)"));
360 else if (i == -1)
361 ND_PRINT((ndo, ": IPv4 prefix (invalid length)"));
362 else
363 ND_PRINT((ndo, ": IPv4 prefix %s", buf));
364 }
365 else if (af == AFNUM_INET6) {
366 i=decode_prefix6(ndo, tptr, tlv_tlen, buf, sizeof(buf));
367 if (i == -2)
368 goto trunc;
369 if (i == -3)
370 ND_PRINT((ndo, ": IPv4 prefix (goes past end of TLV)"));
371 else if (i == -1)
372 ND_PRINT((ndo, ": IPv6 prefix (invalid length)"));
373 else
374 ND_PRINT((ndo, ": IPv6 prefix %s", buf));
375 }
376 else
377 ND_PRINT((ndo, ": Address family %u prefix", af));
378 break;
379 case LDP_FEC_HOSTADDRESS:
380 break;
381 case LDP_FEC_MARTINI_VC:
382 /*
383 * According to RFC 4908, the VC info Length field can be zero,
384 * in which case not only are there no interface parameters,
385 * there's no VC ID.
386 */
387 TLV_TCHECK(7);
388 vc_info_len = *(tptr+2);
389
390 if (vc_info_len == 0) {
391 ND_PRINT((ndo, ": %s, %scontrol word, group-ID %u, VC-info-length: %u",
392 tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
393 EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
394 EXTRACT_32BITS(tptr+3),
395 vc_info_len));
396 break;
397 }
398
399 /* Make sure we have the VC ID as well */
400 TLV_TCHECK(11);
401 ND_PRINT((ndo, ": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
402 tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
403 EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
404 EXTRACT_32BITS(tptr+3),
405 EXTRACT_32BITS(tptr+7),
406 vc_info_len));
407 if (vc_info_len < 4) {
408 /* minimum 4, for the VC ID */
409 ND_PRINT((ndo, " (invalid, < 4"));
410 return(tlv_len+4); /* Type & Length fields not included */
411 }
412 vc_info_len -= 4; /* subtract out the VC ID, giving the length of the interface parameters */
413
414 /* Skip past the fixed information and the VC ID */
415 tptr+=11;
416 tlv_tlen-=11;
417 TLV_TCHECK(vc_info_len);
418
419 while (vc_info_len > 2) {
420 vc_info_tlv_type = *tptr;
421 vc_info_tlv_len = *(tptr+1);
422 if (vc_info_tlv_len < 2)
423 break;
424 if (vc_info_len < vc_info_tlv_len)
425 break;
426
427 ND_PRINT((ndo, "\n\t\tInterface Parameter: %s (0x%02x), len %u",
428 tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
429 vc_info_tlv_type,
430 vc_info_tlv_len));
431
432 switch(vc_info_tlv_type) {
433 case LDP_FEC_MARTINI_IFPARM_MTU:
434 ND_PRINT((ndo, ": %u", EXTRACT_16BITS(tptr+2)));
435 break;
436
437 case LDP_FEC_MARTINI_IFPARM_DESC:
438 ND_PRINT((ndo, ": "));
439 for (idx = 2; idx < vc_info_tlv_len; idx++)
440 safeputchar(ndo, *(tptr + idx));
441 break;
442
443 case LDP_FEC_MARTINI_IFPARM_VCCV:
444 ND_PRINT((ndo, "\n\t\t Control Channels (0x%02x) = [%s]",
445 *(tptr+2),
446 bittok2str(ldp_fec_martini_ifparm_vccv_cc_values, "none", *(tptr+2))));
447 ND_PRINT((ndo, "\n\t\t CV Types (0x%02x) = [%s]",
448 *(tptr+3),
449 bittok2str(ldp_fec_martini_ifparm_vccv_cv_values, "none", *(tptr+3))));
450 break;
451
452 default:
453 print_unknown_data(ndo, tptr+2, "\n\t\t ", vc_info_tlv_len-2);
454 break;
455 }
456
457 vc_info_len -= vc_info_tlv_len;
458 tptr += vc_info_tlv_len;
459 }
460 break;
461 }
462
463 break;
464
465 case LDP_TLV_GENERIC_LABEL:
466 TLV_TCHECK(4);
467 ND_PRINT((ndo, "\n\t Label: %u", EXTRACT_32BITS(tptr) & 0xfffff));
468 break;
469
470 case LDP_TLV_STATUS:
471 TLV_TCHECK(8);
472 ui = EXTRACT_32BITS(tptr);
473 tptr+=4;
474 ND_PRINT((ndo, "\n\t Status: 0x%02x, Flags: [%s and %s forward]",
475 ui&0x3fffffff,
476 ui&0x80000000 ? "Fatal error" : "Advisory Notification",
477 ui&0x40000000 ? "do" : "don't"));
478 ui = EXTRACT_32BITS(tptr);
479 tptr+=4;
480 if (ui)
481 ND_PRINT((ndo, ", causing Message ID: 0x%08x", ui));
482 break;
483
484 case LDP_TLV_FT_SESSION:
485 TLV_TCHECK(8);
486 ft_flags = EXTRACT_16BITS(tptr);
487 ND_PRINT((ndo, "\n\t Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
488 ft_flags&0x8000 ? "" : "No ",
489 ft_flags&0x8 ? "" : "Don't ",
490 ft_flags&0x4 ? "" : "No ",
491 ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels",
492 ft_flags&0x1 ? "" : "Don't "));
493 tptr+=4;
494 ui = EXTRACT_32BITS(tptr);
495 if (ui)
496 ND_PRINT((ndo, ", Reconnect Timeout: %ums", ui));
497 tptr+=4;
498 ui = EXTRACT_32BITS(tptr);
499 if (ui)
500 ND_PRINT((ndo, ", Recovery Time: %ums", ui));
501 break;
502
503 case LDP_TLV_MTU:
504 TLV_TCHECK(2);
505 ND_PRINT((ndo, "\n\t MTU: %u", EXTRACT_16BITS(tptr)));
506 break;
507
508
509 /*
510 * FIXME those are the defined TLVs that lack a decoder
511 * you are welcome to contribute code ;-)
512 */
513
514 case LDP_TLV_HOP_COUNT:
515 case LDP_TLV_PATH_VECTOR:
516 case LDP_TLV_ATM_LABEL:
517 case LDP_TLV_FR_LABEL:
518 case LDP_TLV_EXTD_STATUS:
519 case LDP_TLV_RETURNED_PDU:
520 case LDP_TLV_RETURNED_MSG:
521 case LDP_TLV_ATM_SESSION_PARM:
522 case LDP_TLV_FR_SESSION_PARM:
523 case LDP_TLV_LABEL_REQUEST_MSG_ID:
524
525 default:
526 if (ndo->ndo_vflag <= 1)
527 print_unknown_data(ndo, tptr, "\n\t ", tlv_tlen);
528 break;
529 }
530 return(tlv_len+4); /* Type & Length fields not included */
531
532 trunc:
533 ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
534 return 0;
535
536 badtlv:
537 ND_PRINT((ndo, "\n\t\t TLV contents go past end of TLV"));
538 return(tlv_len+4); /* Type & Length fields not included */
539 }
540
541 void
542 ldp_print(netdissect_options *ndo,
543 register const u_char *pptr, register u_int len)
544 {
545 int processed;
546 while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
547 processed = ldp_pdu_print(ndo, pptr);
548 if (processed == 0)
549 return;
550 len -= processed;
551 pptr += processed;
552 }
553 }
554
555 static int
556 ldp_pdu_print(netdissect_options *ndo,
557 register const u_char *pptr)
558 {
559 const struct ldp_common_header *ldp_com_header;
560 const struct ldp_msg_header *ldp_msg_header;
561 const u_char *tptr,*msg_tptr;
562 u_short tlen;
563 u_short pdu_len,msg_len,msg_type,msg_tlen;
564 int hexdump,processed;
565
566 ldp_com_header = (const struct ldp_common_header *)pptr;
567 ND_TCHECK(*ldp_com_header);
568
569 /*
570 * Sanity checking of the header.
571 */
572 if (EXTRACT_16BITS(&ldp_com_header->version) != LDP_VERSION) {
573 ND_PRINT((ndo, "%sLDP version %u packet not supported",
574 (ndo->ndo_vflag < 1) ? "" : "\n\t",
575 EXTRACT_16BITS(&ldp_com_header->version)));
576 return 0;
577 }
578
579 pdu_len = EXTRACT_16BITS(&ldp_com_header->pdu_length);
580 if (pdu_len < sizeof(const struct ldp_common_header)-4) {
581 /* length too short */
582 ND_PRINT((ndo, "%sLDP, pdu-length: %u (too short, < %u)",
583 (ndo->ndo_vflag < 1) ? "" : "\n\t",
584 pdu_len,
585 (u_int)(sizeof(const struct ldp_common_header)-4)));
586 return 0;
587 }
588
589 /* print the LSR-ID, label-space & length */
590 ND_PRINT((ndo, "%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
591 (ndo->ndo_vflag < 1) ? "" : "\n\t",
592 ipaddr_string(ndo, &ldp_com_header->lsr_id),
593 EXTRACT_16BITS(&ldp_com_header->label_space),
594 pdu_len));
595
596 /* bail out if non-verbose */
597 if (ndo->ndo_vflag < 1)
598 return 0;
599
600 /* ok they seem to want to know everything - lets fully decode it */
601 tptr = pptr + sizeof(const struct ldp_common_header);
602 tlen = pdu_len - (sizeof(const struct ldp_common_header)-4); /* Type & Length fields not included */
603
604 while(tlen>0) {
605 /* did we capture enough for fully decoding the msg header ? */
606 ND_TCHECK2(*tptr, sizeof(struct ldp_msg_header));
607
608 ldp_msg_header = (const struct ldp_msg_header *)tptr;
609 msg_len=EXTRACT_16BITS(ldp_msg_header->length);
610 msg_type=LDP_MASK_MSG_TYPE(EXTRACT_16BITS(ldp_msg_header->type));
611
612 if (msg_len < sizeof(struct ldp_msg_header)-4) {
613 /* length too short */
614 /* FIXME vendor private / experimental check */
615 ND_PRINT((ndo, "\n\t %s Message (0x%04x), length: %u (too short, < %u)",
616 tok2str(ldp_msg_values,
617 "Unknown",
618 msg_type),
619 msg_type,
620 msg_len,
621 (u_int)(sizeof(struct ldp_msg_header)-4)));
622 return 0;
623 }
624
625 /* FIXME vendor private / experimental check */
626 ND_PRINT((ndo, "\n\t %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
627 tok2str(ldp_msg_values,
628 "Unknown",
629 msg_type),
630 msg_type,
631 msg_len,
632 EXTRACT_32BITS(&ldp_msg_header->id),
633 LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_msg_header->type)) ? "continue processing" : "ignore"));
634
635 msg_tptr=tptr+sizeof(struct ldp_msg_header);
636 msg_tlen=msg_len-(sizeof(struct ldp_msg_header)-4); /* Type & Length fields not included */
637
638 /* did we capture enough for fully decoding the message ? */
639 ND_TCHECK2(*tptr, msg_len);
640 hexdump=FALSE;
641
642 switch(msg_type) {
643
644 case LDP_MSG_NOTIF:
645 case LDP_MSG_HELLO:
646 case LDP_MSG_INIT:
647 case LDP_MSG_KEEPALIVE:
648 case LDP_MSG_ADDRESS:
649 case LDP_MSG_LABEL_MAPPING:
650 case LDP_MSG_ADDRESS_WITHDRAW:
651 case LDP_MSG_LABEL_WITHDRAW:
652 while(msg_tlen >= 4) {
653 processed = ldp_tlv_print(ndo, msg_tptr, msg_tlen);
654 if (processed == 0)
655 break;
656 msg_tlen-=processed;
657 msg_tptr+=processed;
658 }
659 break;
660
661 /*
662 * FIXME those are the defined messages that lack a decoder
663 * you are welcome to contribute code ;-)
664 */
665
666 case LDP_MSG_LABEL_REQUEST:
667 case LDP_MSG_LABEL_RELEASE:
668 case LDP_MSG_LABEL_ABORT_REQUEST:
669
670 default:
671 if (ndo->ndo_vflag <= 1)
672 print_unknown_data(ndo, msg_tptr, "\n\t ", msg_tlen);
673 break;
674 }
675 /* do we want to see an additionally hexdump ? */
676 if (ndo->ndo_vflag > 1 || hexdump==TRUE)
677 print_unknown_data(ndo, tptr+sizeof(struct ldp_msg_header), "\n\t ",
678 msg_len);
679
680 tptr += msg_len+4;
681 tlen -= msg_len+4;
682 }
683 return pdu_len+4;
684 trunc:
685 ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
686 return 0;
687 }
688
689 /*
690 * Local Variables:
691 * c-style: whitesmith
692 * c-basic-offset: 8
693 * End:
694 */
[mirror] the TCPdump network dissector