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1 office 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 uint8_t version[2];
48 uint8_t pdu_length[2];
49 uint8_t lsr_id[4];
50 uint8_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 uint8_t type[2];
81 uint8_t length[2];
82 uint8_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_pdu_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 u_short msg_tlen)
238 {
239 struct ldp_tlv_header {
240 uint8_t type[2];
241 uint8_t length[2];
242 };
243  
244 const struct ldp_tlv_header *ldp_tlv_header;
245 u_short tlv_type,tlv_len,tlv_tlen,af,ft_flags;
246 u_char fec_type;
247 u_int ui,vc_info_len, vc_info_tlv_type, vc_info_tlv_len,idx;
248 char buf[100];
249 int i;
250  
251 ldp_tlv_header = (const struct ldp_tlv_header *)tptr;
252 ND_TCHECK(*ldp_tlv_header);
253 tlv_len=EXTRACT_16BITS(ldp_tlv_header->length);
254 if (tlv_len + 4 > msg_tlen) {
255 ND_PRINT((ndo, "\n\t\t TLV contents go past end of message"));
256 return 0;
257 }
258 tlv_tlen=tlv_len;
259 tlv_type=LDP_MASK_TLV_TYPE(EXTRACT_16BITS(ldp_tlv_header->type));
260  
261 /* FIXME vendor private / experimental check */
262 ND_PRINT((ndo, "\n\t %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]",
263 tok2str(ldp_tlv_values,
264 "Unknown",
265 tlv_type),
266 tlv_type,
267 tlv_len,
268 LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "continue processing" : "ignore",
269 LDP_MASK_F_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "do" : "don't"));
270  
271 tptr+=sizeof(struct ldp_tlv_header);
272  
273 switch(tlv_type) {
274  
275 case LDP_TLV_COMMON_HELLO:
276 TLV_TCHECK(4);
277 ND_PRINT((ndo, "\n\t Hold Time: %us, Flags: [%s Hello%s]",
278 EXTRACT_16BITS(tptr),
279 (EXTRACT_16BITS(tptr+2)&0x8000) ? "Targeted" : "Link",
280 (EXTRACT_16BITS(tptr+2)&0x4000) ? ", Request for targeted Hellos" : ""));
281 break;
282  
283 case LDP_TLV_IPV4_TRANSPORT_ADDR:
284 TLV_TCHECK(4);
285 ND_PRINT((ndo, "\n\t IPv4 Transport Address: %s", ipaddr_string(ndo, tptr)));
286 break;
287 #ifdef INET6
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 #endif
293 case LDP_TLV_CONFIG_SEQ_NUMBER:
294 TLV_TCHECK(4);
295 ND_PRINT((ndo, "\n\t Sequence Number: %u", EXTRACT_32BITS(tptr)));
296 break;
297  
298 case LDP_TLV_ADDRESS_LIST:
299 TLV_TCHECK(LDP_TLV_ADDRESS_LIST_AFNUM_LEN);
300 af = EXTRACT_16BITS(tptr);
301 tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
302 tlv_tlen -= LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
303 ND_PRINT((ndo, "\n\t Address Family: %s, addresses",
304 tok2str(af_values, "Unknown (%u)", af)));
305 switch (af) {
306 case AFNUM_INET:
307 while(tlv_tlen >= sizeof(struct in_addr)) {
308 ND_TCHECK2(*tptr, sizeof(struct in_addr));
309 ND_PRINT((ndo, " %s", ipaddr_string(ndo, tptr)));
310 tlv_tlen-=sizeof(struct in_addr);
311 tptr+=sizeof(struct in_addr);
312 }
313 break;
314 #ifdef INET6
315 case AFNUM_INET6:
316 while(tlv_tlen >= sizeof(struct in6_addr)) {
317 ND_TCHECK2(*tptr, sizeof(struct in6_addr));
318 ND_PRINT((ndo, " %s", ip6addr_string(ndo, tptr)));
319 tlv_tlen-=sizeof(struct in6_addr);
320 tptr+=sizeof(struct in6_addr);
321 }
322 break;
323 #endif
324 default:
325 /* unknown AF */
326 break;
327 }
328 break;
329  
330 case LDP_TLV_COMMON_SESSION:
331 TLV_TCHECK(8);
332 ND_PRINT((ndo, "\n\t Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
333 EXTRACT_16BITS(tptr), EXTRACT_16BITS(tptr+2),
334 (EXTRACT_16BITS(tptr+6)&0x8000) ? "On Demand" : "Unsolicited",
335 (EXTRACT_16BITS(tptr+6)&0x4000) ? "Enabled" : "Disabled"
336 ));
337 break;
338  
339 case LDP_TLV_FEC:
340 TLV_TCHECK(1);
341 fec_type = *tptr;
342 ND_PRINT((ndo, "\n\t %s FEC (0x%02x)",
343 tok2str(ldp_fec_values, "Unknown", fec_type),
344 fec_type));
345  
346 tptr+=1;
347 tlv_tlen-=1;
348 switch(fec_type) {
349  
350 case LDP_FEC_WILDCARD:
351 break;
352 case LDP_FEC_PREFIX:
353 TLV_TCHECK(2);
354 af = EXTRACT_16BITS(tptr);
355 tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
356 tlv_tlen-=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
357 if (af == AFNUM_INET) {
358 i=decode_prefix4(ndo, tptr, tlv_tlen, buf, sizeof(buf));
359 if (i == -2)
360 goto trunc;
361 if (i == -3)
362 ND_PRINT((ndo, ": IPv4 prefix (goes past end of TLV)"));
363 else if (i == -1)
364 ND_PRINT((ndo, ": IPv4 prefix (invalid length)"));
365 else
366 ND_PRINT((ndo, ": IPv4 prefix %s", buf));
367 }
368 #ifdef INET6
369 else if (af == AFNUM_INET6) {
370 i=decode_prefix6(ndo, tptr, tlv_tlen, buf, sizeof(buf));
371 if (i == -2)
372 goto trunc;
373 if (i == -3)
374 ND_PRINT((ndo, ": IPv4 prefix (goes past end of TLV)"));
375 else if (i == -1)
376 ND_PRINT((ndo, ": IPv6 prefix (invalid length)"));
377 else
378 ND_PRINT((ndo, ": IPv6 prefix %s", buf));
379 }
380 #endif
381 else
382 ND_PRINT((ndo, ": Address family %u prefix", af));
383 break;
384 case LDP_FEC_HOSTADDRESS:
385 break;
386 case LDP_FEC_MARTINI_VC:
387 /*
388 * According to RFC 4908, the VC info Length field can be zero,
389 * in which case not only are there no interface parameters,
390 * there's no VC ID.
391 */
392 TLV_TCHECK(7);
393 vc_info_len = *(tptr+2);
394  
395 if (vc_info_len == 0) {
396 ND_PRINT((ndo, ": %s, %scontrol word, group-ID %u, VC-info-length: %u",
397 tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
398 EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
399 EXTRACT_32BITS(tptr+3),
400 vc_info_len));
401 break;
402 }
403  
404 /* Make sure we have the VC ID as well */
405 TLV_TCHECK(11);
406 ND_PRINT((ndo, ": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
407 tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
408 EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
409 EXTRACT_32BITS(tptr+3),
410 EXTRACT_32BITS(tptr+7),
411 vc_info_len));
412 if (vc_info_len < 4) {
413 /* minimum 4, for the VC ID */
414 ND_PRINT((ndo, " (invalid, < 4"));
415 return(tlv_len+4); /* Type & Length fields not included */
416 }
417 vc_info_len -= 4; /* subtract out the VC ID, giving the length of the interface parameters */
418  
419 /* Skip past the fixed information and the VC ID */
420 tptr+=11;
421 tlv_tlen-=11;
422 TLV_TCHECK(vc_info_len);
423  
424 while (vc_info_len > 2) {
425 vc_info_tlv_type = *tptr;
426 vc_info_tlv_len = *(tptr+1);
427 if (vc_info_tlv_len < 2)
428 break;
429 if (vc_info_len < vc_info_tlv_len)
430 break;
431  
432 ND_PRINT((ndo, "\n\t\tInterface Parameter: %s (0x%02x), len %u",
433 tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
434 vc_info_tlv_type,
435 vc_info_tlv_len));
436  
437 switch(vc_info_tlv_type) {
438 case LDP_FEC_MARTINI_IFPARM_MTU:
439 ND_PRINT((ndo, ": %u", EXTRACT_16BITS(tptr+2)));
440 break;
441  
442 case LDP_FEC_MARTINI_IFPARM_DESC:
443 ND_PRINT((ndo, ": "));
444 for (idx = 2; idx < vc_info_tlv_len; idx++)
445 safeputchar(ndo, *(tptr + idx));
446 break;
447  
448 case LDP_FEC_MARTINI_IFPARM_VCCV:
449 ND_PRINT((ndo, "\n\t\t Control Channels (0x%02x) = [%s]",
450 *(tptr+2),
451 bittok2str(ldp_fec_martini_ifparm_vccv_cc_values, "none", *(tptr+2))));
452 ND_PRINT((ndo, "\n\t\t CV Types (0x%02x) = [%s]",
453 *(tptr+3),
454 bittok2str(ldp_fec_martini_ifparm_vccv_cv_values, "none", *(tptr+3))));
455 break;
456  
457 default:
458 print_unknown_data(ndo, tptr+2, "\n\t\t ", vc_info_tlv_len-2);
459 break;
460 }
461  
462 vc_info_len -= vc_info_tlv_len;
463 tptr += vc_info_tlv_len;
464 }
465 break;
466 }
467  
468 break;
469  
470 case LDP_TLV_GENERIC_LABEL:
471 TLV_TCHECK(4);
472 ND_PRINT((ndo, "\n\t Label: %u", EXTRACT_32BITS(tptr) & 0xfffff));
473 break;
474  
475 case LDP_TLV_STATUS:
476 TLV_TCHECK(8);
477 ui = EXTRACT_32BITS(tptr);
478 tptr+=4;
479 ND_PRINT((ndo, "\n\t Status: 0x%02x, Flags: [%s and %s forward]",
480 ui&0x3fffffff,
481 ui&0x80000000 ? "Fatal error" : "Advisory Notification",
482 ui&0x40000000 ? "do" : "don't"));
483 ui = EXTRACT_32BITS(tptr);
484 tptr+=4;
485 if (ui)
486 ND_PRINT((ndo, ", causing Message ID: 0x%08x", ui));
487 break;
488  
489 case LDP_TLV_FT_SESSION:
490 TLV_TCHECK(8);
491 ft_flags = EXTRACT_16BITS(tptr);
492 ND_PRINT((ndo, "\n\t Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
493 ft_flags&0x8000 ? "" : "No ",
494 ft_flags&0x8 ? "" : "Don't ",
495 ft_flags&0x4 ? "" : "No ",
496 ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels",
497 ft_flags&0x1 ? "" : "Don't "));
498 tptr+=4;
499 ui = EXTRACT_32BITS(tptr);
500 if (ui)
501 ND_PRINT((ndo, ", Reconnect Timeout: %ums", ui));
502 tptr+=4;
503 ui = EXTRACT_32BITS(tptr);
504 if (ui)
505 ND_PRINT((ndo, ", Recovery Time: %ums", ui));
506 break;
507  
508 case LDP_TLV_MTU:
509 TLV_TCHECK(2);
510 ND_PRINT((ndo, "\n\t MTU: %u", EXTRACT_16BITS(tptr)));
511 break;
512  
513  
514 /*
515 * FIXME those are the defined TLVs that lack a decoder
516 * you are welcome to contribute code ;-)
517 */
518  
519 case LDP_TLV_HOP_COUNT:
520 case LDP_TLV_PATH_VECTOR:
521 case LDP_TLV_ATM_LABEL:
522 case LDP_TLV_FR_LABEL:
523 case LDP_TLV_EXTD_STATUS:
524 case LDP_TLV_RETURNED_PDU:
525 case LDP_TLV_RETURNED_MSG:
526 case LDP_TLV_ATM_SESSION_PARM:
527 case LDP_TLV_FR_SESSION_PARM:
528 case LDP_TLV_LABEL_REQUEST_MSG_ID:
529  
530 default:
531 if (ndo->ndo_vflag <= 1)
532 print_unknown_data(ndo, tptr, "\n\t ", tlv_tlen);
533 break;
534 }
535 return(tlv_len+4); /* Type & Length fields not included */
536  
537 trunc:
538 ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
539 return 0;
540  
541 badtlv:
542 ND_PRINT((ndo, "\n\t\t TLV contents go past end of TLV"));
543 return(tlv_len+4); /* Type & Length fields not included */
544 }
545  
546 void
547 ldp_print(netdissect_options *ndo,
548 register const u_char *pptr, register u_int len)
549 {
550 int processed;
551 while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
552 processed = ldp_pdu_print(ndo, pptr);
553 if (processed == 0)
554 return;
555 len -= processed;
556 pptr += processed;
557 }
558 }
559  
560 static int
561 ldp_pdu_print(netdissect_options *ndo,
562 register const u_char *pptr)
563 {
564 const struct ldp_common_header *ldp_com_header;
565 const struct ldp_msg_header *ldp_msg_header;
566 const u_char *tptr,*msg_tptr;
567 u_short tlen;
568 u_short pdu_len,msg_len,msg_type,msg_tlen;
569 int hexdump,processed;
570  
571 ldp_com_header = (const struct ldp_common_header *)pptr;
572 ND_TCHECK(*ldp_com_header);
573  
574 /*
575 * Sanity checking of the header.
576 */
577 if (EXTRACT_16BITS(&ldp_com_header->version) != LDP_VERSION) {
578 ND_PRINT((ndo, "%sLDP version %u packet not supported",
579 (ndo->ndo_vflag < 1) ? "" : "\n\t",
580 EXTRACT_16BITS(&ldp_com_header->version)));
581 return 0;
582 }
583  
584 pdu_len = EXTRACT_16BITS(&ldp_com_header->pdu_length);
585 if (pdu_len < sizeof(const struct ldp_common_header)-4) {
586 /* length too short */
587 ND_PRINT((ndo, "%sLDP, pdu-length: %u (too short, < %u)",
588 (ndo->ndo_vflag < 1) ? "" : "\n\t",
589 pdu_len,
590 (u_int)(sizeof(const struct ldp_common_header)-4)));
591 return 0;
592 }
593  
594 /* print the LSR-ID, label-space & length */
595 ND_PRINT((ndo, "%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
596 (ndo->ndo_vflag < 1) ? "" : "\n\t",
597 ipaddr_string(ndo, &ldp_com_header->lsr_id),
598 EXTRACT_16BITS(&ldp_com_header->label_space),
599 pdu_len));
600  
601 /* bail out if non-verbose */
602 if (ndo->ndo_vflag < 1)
603 return 0;
604  
605 /* ok they seem to want to know everything - lets fully decode it */
606 tptr = pptr + sizeof(const struct ldp_common_header);
607 tlen = pdu_len - (sizeof(const struct ldp_common_header)-4); /* Type & Length fields not included */
608  
609 while(tlen>0) {
610 /* did we capture enough for fully decoding the msg header ? */
611 ND_TCHECK2(*tptr, sizeof(struct ldp_msg_header));
612  
613 ldp_msg_header = (const struct ldp_msg_header *)tptr;
614 msg_len=EXTRACT_16BITS(ldp_msg_header->length);
615 msg_type=LDP_MASK_MSG_TYPE(EXTRACT_16BITS(ldp_msg_header->type));
616  
617 if (msg_len < sizeof(struct ldp_msg_header)-4) {
618 /* length too short */
619 /* FIXME vendor private / experimental check */
620 ND_PRINT((ndo, "\n\t %s Message (0x%04x), length: %u (too short, < %u)",
621 tok2str(ldp_msg_values,
622 "Unknown",
623 msg_type),
624 msg_type,
625 msg_len,
626 (u_int)(sizeof(struct ldp_msg_header)-4)));
627 return 0;
628 }
629  
630 /* FIXME vendor private / experimental check */
631 ND_PRINT((ndo, "\n\t %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
632 tok2str(ldp_msg_values,
633 "Unknown",
634 msg_type),
635 msg_type,
636 msg_len,
637 EXTRACT_32BITS(&ldp_msg_header->id),
638 LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_msg_header->type)) ? "continue processing" : "ignore"));
639  
640 msg_tptr=tptr+sizeof(struct ldp_msg_header);
641 msg_tlen=msg_len-(sizeof(struct ldp_msg_header)-4); /* Type & Length fields not included */
642  
643 /* did we capture enough for fully decoding the message ? */
644 ND_TCHECK2(*tptr, msg_len);
645 hexdump=FALSE;
646  
647 switch(msg_type) {
648  
649 case LDP_MSG_NOTIF:
650 case LDP_MSG_HELLO:
651 case LDP_MSG_INIT:
652 case LDP_MSG_KEEPALIVE:
653 case LDP_MSG_ADDRESS:
654 case LDP_MSG_LABEL_MAPPING:
655 case LDP_MSG_ADDRESS_WITHDRAW:
656 case LDP_MSG_LABEL_WITHDRAW:
657 while(msg_tlen >= 4) {
658 processed = ldp_tlv_print(ndo, msg_tptr, msg_tlen);
659 if (processed == 0)
660 break;
661 msg_tlen-=processed;
662 msg_tptr+=processed;
663 }
664 break;
665  
666 /*
667 * FIXME those are the defined messages that lack a decoder
668 * you are welcome to contribute code ;-)
669 */
670  
671 case LDP_MSG_LABEL_REQUEST:
672 case LDP_MSG_LABEL_RELEASE:
673 case LDP_MSG_LABEL_ABORT_REQUEST:
674  
675 default:
676 if (ndo->ndo_vflag <= 1)
677 print_unknown_data(ndo, msg_tptr, "\n\t ", msg_tlen);
678 break;
679 }
680 /* do we want to see an additionally hexdump ? */
681 if (ndo->ndo_vflag > 1 || hexdump==TRUE)
682 print_unknown_data(ndo, tptr+sizeof(struct ldp_msg_header), "\n\t ",
683 msg_len);
684  
685 tptr += msg_len+4;
686 tlen -= msg_len+4;
687 }
688 return pdu_len+4;
689 trunc:
690 ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
691 return 0;
692 }
693  
694 /*
695 * Local Variables:
696 * c-style: whitesmith
697 * c-basic-offset: 8
698 * End:
699 */