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IP: Remove an unused and deprecated option number
[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@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
33 /*
34 * ldp common header
35 *
36 * 0 1 2 3
37 * 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
38 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
39 * | Version | PDU Length |
40 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
41 * | LDP Identifier |
42 * + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
43 * | |
44 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
45 *
46 */
47
48 struct ldp_common_header {
49 nd_uint16_t version;
50 nd_uint16_t pdu_length;
51 nd_ipv4 lsr_id;
52 nd_uint16_t label_space;
53 };
54
55 #define LDP_VERSION 1
56
57 /*
58 * ldp message header
59 *
60 * 0 1 2 3
61 * 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
62 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
63 * |U| Message Type | Message Length |
64 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
65 * | Message ID |
66 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
67 * | |
68 * + +
69 * | Mandatory Parameters |
70 * + +
71 * | |
72 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
73 * | |
74 * + +
75 * | Optional Parameters |
76 * + +
77 * | |
78 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
79 */
80
81 struct ldp_msg_header {
82 nd_uint16_t type;
83 nd_uint16_t length;
84 nd_uint32_t id;
85 };
86
87 #define LDP_MASK_MSG_TYPE(x) ((x)&0x7fff)
88 #define LDP_MASK_U_BIT(x) ((x)&0x8000)
89
90 #define LDP_MSG_NOTIF 0x0001
91 #define LDP_MSG_HELLO 0x0100
92 #define LDP_MSG_INIT 0x0200
93 #define LDP_MSG_KEEPALIVE 0x0201
94 #define LDP_MSG_ADDRESS 0x0300
95 #define LDP_MSG_ADDRESS_WITHDRAW 0x0301
96 #define LDP_MSG_LABEL_MAPPING 0x0400
97 #define LDP_MSG_LABEL_REQUEST 0x0401
98 #define LDP_MSG_LABEL_WITHDRAW 0x0402
99 #define LDP_MSG_LABEL_RELEASE 0x0403
100 #define LDP_MSG_LABEL_ABORT_REQUEST 0x0404
101
102 #define LDP_VENDOR_PRIVATE_MIN 0x3e00
103 #define LDP_VENDOR_PRIVATE_MAX 0x3eff
104 #define LDP_EXPERIMENTAL_MIN 0x3f00
105 #define LDP_EXPERIMENTAL_MAX 0x3fff
106
107 static const struct tok ldp_msg_values[] = {
108 { LDP_MSG_NOTIF, "Notification" },
109 { LDP_MSG_HELLO, "Hello" },
110 { LDP_MSG_INIT, "Initialization" },
111 { LDP_MSG_KEEPALIVE, "Keepalive" },
112 { LDP_MSG_ADDRESS, "Address" },
113 { LDP_MSG_ADDRESS_WITHDRAW, "Address Withdraw" },
114 { LDP_MSG_LABEL_MAPPING, "Label Mapping" },
115 { LDP_MSG_LABEL_REQUEST, "Label Request" },
116 { LDP_MSG_LABEL_WITHDRAW, "Label Withdraw" },
117 { LDP_MSG_LABEL_RELEASE, "Label Release" },
118 { LDP_MSG_LABEL_ABORT_REQUEST, "Label Abort Request" },
119 { 0, NULL}
120 };
121
122 #define LDP_MASK_TLV_TYPE(x) ((x)&0x3fff)
123 #define LDP_MASK_F_BIT(x) ((x)&0x4000)
124
125 #define LDP_TLV_FEC 0x0100
126 #define LDP_TLV_ADDRESS_LIST 0x0101
127 #define LDP_TLV_ADDRESS_LIST_AFNUM_LEN 2
128 #define LDP_TLV_HOP_COUNT 0x0103
129 #define LDP_TLV_PATH_VECTOR 0x0104
130 #define LDP_TLV_GENERIC_LABEL 0x0200
131 #define LDP_TLV_ATM_LABEL 0x0201
132 #define LDP_TLV_FR_LABEL 0x0202
133 #define LDP_TLV_STATUS 0x0300
134 #define LDP_TLV_EXTD_STATUS 0x0301
135 #define LDP_TLV_RETURNED_PDU 0x0302
136 #define LDP_TLV_RETURNED_MSG 0x0303
137 #define LDP_TLV_COMMON_HELLO 0x0400
138 #define LDP_TLV_IPV4_TRANSPORT_ADDR 0x0401
139 #define LDP_TLV_CONFIG_SEQ_NUMBER 0x0402
140 #define LDP_TLV_IPV6_TRANSPORT_ADDR 0x0403
141 #define LDP_TLV_COMMON_SESSION 0x0500
142 #define LDP_TLV_ATM_SESSION_PARM 0x0501
143 #define LDP_TLV_FR_SESSION_PARM 0x0502
144 #define LDP_TLV_FT_SESSION 0x0503
145 #define LDP_TLV_TYPED_WC_FEC_CAP 0x050b /* rfc 5918 */
146 #define LDP_TLV_LABEL_REQUEST_MSG_ID 0x0600
147 #define LDP_TLV_MTU 0x0601 /* rfc 3988 */
148 #define LDP_TLV_DUAL_STACK_CAP 0x0701 /* rfc 7552 */
149
150 static const struct tok ldp_tlv_values[] = {
151 { LDP_TLV_FEC, "FEC" },
152 { LDP_TLV_ADDRESS_LIST, "Address List" },
153 { LDP_TLV_HOP_COUNT, "Hop Count" },
154 { LDP_TLV_PATH_VECTOR, "Path Vector" },
155 { LDP_TLV_GENERIC_LABEL, "Generic Label" },
156 { LDP_TLV_ATM_LABEL, "ATM Label" },
157 { LDP_TLV_FR_LABEL, "Frame-Relay Label" },
158 { LDP_TLV_STATUS, "Status" },
159 { LDP_TLV_EXTD_STATUS, "Extended Status" },
160 { LDP_TLV_RETURNED_PDU, "Returned PDU" },
161 { LDP_TLV_RETURNED_MSG, "Returned Message" },
162 { LDP_TLV_COMMON_HELLO, "Common Hello Parameters" },
163 { LDP_TLV_IPV4_TRANSPORT_ADDR, "IPv4 Transport Address" },
164 { LDP_TLV_CONFIG_SEQ_NUMBER, "Configuration Sequence Number" },
165 { LDP_TLV_IPV6_TRANSPORT_ADDR, "IPv6 Transport Address" },
166 { LDP_TLV_COMMON_SESSION, "Common Session Parameters" },
167 { LDP_TLV_ATM_SESSION_PARM, "ATM Session Parameters" },
168 { LDP_TLV_FR_SESSION_PARM, "Frame-Relay Session Parameters" },
169 { LDP_TLV_FT_SESSION, "Fault-Tolerant Session Parameters" },
170 { LDP_TLV_TYPED_WC_FEC_CAP, "Typed Wildcard FEC Capability" },
171 { LDP_TLV_LABEL_REQUEST_MSG_ID, "Label Request Message ID" },
172 { LDP_TLV_MTU, "MTU" },
173 { LDP_TLV_DUAL_STACK_CAP, "Dual-Stack Capability" },
174 { 0, NULL}
175 };
176
177 static const struct tok ldp_status_code_values[] = {
178 /* rfc 5036 */
179 { 0x00000000, "Success" },
180 { 0x00000001, "Bad LDP Identifier" },
181 { 0x00000002, "Bad Protocol Version" },
182 { 0x00000003, "Bad PDU Length" },
183 { 0x00000004, "Unknown Message Type" },
184 { 0x00000005, "Bad Message Length" },
185 { 0x00000006, "Unknown TLV" },
186 { 0x00000007, "Bad TLV Length" },
187 { 0x00000008, "Malformted TLV Value" },
188 { 0x00000009, "Hold Timer Expired" },
189 { 0x0000000A, "Shutdown" },
190 { 0x0000000B, "Loop Detected" },
191 { 0x0000000C, "Unknown FEC" },
192 { 0x0000000D, "No Route" },
193 { 0x0000000E, "No Label Resources" },
194 { 0x0000000F, "Label Resources/Available" },
195 { 0x00000010, "Session Rejected/No Hello" },
196 { 0x00000011, "Session Rejected/Parameters Advertisement Mode" },
197 { 0x00000012, "Session Rejected/Parameters Max PDU Length" },
198 { 0x00000013, "Session Rejected/Parameters Label Range" },
199 { 0x00000014, "KeepAlive Timer Expired" },
200 { 0x00000015, "Label Request Aborted" },
201 { 0x00000016, "Missing Message Parameters" },
202 { 0x00000017, "Unsupported Address Family" },
203 { 0x00000018, "Session Rejected/Bad KeepAlive Time" },
204 { 0x00000019, "Internal Error" },
205 { 0, NULL}
206 };
207
208 #define LDP_FEC_WILDCARD 0x01
209 #define LDP_FEC_PREFIX 0x02
210 #define LDP_FEC_HOSTADDRESS 0x03
211 /* From RFC 4906; should probably be updated to RFC 4447 (e.g., VC -> PW) */
212 #define LDP_FEC_MARTINI_VC 0x80
213
214 static const struct tok ldp_fec_values[] = {
215 { LDP_FEC_WILDCARD, "Wildcard" },
216 { LDP_FEC_PREFIX, "Prefix" },
217 { LDP_FEC_HOSTADDRESS, "Host address" },
218 { LDP_FEC_MARTINI_VC, "Martini VC" },
219 { 0, NULL}
220 };
221
222 #define LDP_FEC_MARTINI_IFPARM_MTU 0x01
223 #define LDP_FEC_MARTINI_IFPARM_DESC 0x03
224 #define LDP_FEC_MARTINI_IFPARM_VCCV 0x0c
225
226 static const struct tok ldp_fec_martini_ifparm_values[] = {
227 { LDP_FEC_MARTINI_IFPARM_MTU, "MTU" },
228 { LDP_FEC_MARTINI_IFPARM_DESC, "Description" },
229 { LDP_FEC_MARTINI_IFPARM_VCCV, "VCCV" },
230 { 0, NULL}
231 };
232
233 /* draft-ietf-pwe3-vccv-04.txt */
234 static const struct tok ldp_fec_martini_ifparm_vccv_cc_values[] = {
235 { 0x01, "PWE3 control word" },
236 { 0x02, "MPLS Router Alert Label" },
237 { 0x04, "MPLS inner label TTL = 1" },
238 { 0, NULL}
239 };
240
241 /* draft-ietf-pwe3-vccv-04.txt */
242 static const struct tok ldp_fec_martini_ifparm_vccv_cv_values[] = {
243 { 0x01, "ICMP Ping" },
244 { 0x02, "LSP Ping" },
245 { 0x04, "BFD" },
246 { 0, NULL}
247 };
248
249 /* rfc 7552 */
250 #define LDP_DUAL_STACK_TRANSPORT_PREF_IPV4 0x40
251 #define LDP_DUAL_STACK_TRANSPORT_PREF_IPV6 0x60
252
253 static const struct tok ldp_dual_stack_transport_pref_values[] = {
254 { LDP_DUAL_STACK_TRANSPORT_PREF_IPV4, "IPv4" },
255 { LDP_DUAL_STACK_TRANSPORT_PREF_IPV6, "IPv6" },
256 { 0, NULL}
257 };
258
259 static u_int ldp_pdu_print(netdissect_options *, const u_char *);
260
261 /*
262 * ldp tlv header
263 *
264 * 0 1 2 3
265 * 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
266 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
267 * |U|F| Type | Length |
268 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
269 * | |
270 * | Value |
271 * ~ ~
272 * | |
273 * | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
274 * | |
275 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
276 */
277
278 #define TLV_TCHECK(minlen) \
279 if (tlv_tlen < minlen) { \
280 ND_PRINT(" [tlv length %u < %u]", tlv_tlen, minlen); \
281 nd_print_invalid(ndo); \
282 goto invalid; \
283 }
284
285 static u_int
286 ldp_tlv_print(netdissect_options *ndo,
287 const u_char *tptr,
288 u_int msg_tlen)
289 {
290 struct ldp_tlv_header {
291 nd_uint16_t type;
292 nd_uint16_t length;
293 };
294
295 const struct ldp_tlv_header *ldp_tlv_header;
296 u_short tlv_type,tlv_len,tlv_tlen,af,ft_flags;
297 u_char fec_type, transport_pref;
298 u_int ui,vc_info_len, vc_info_tlv_type, vc_info_tlv_len,idx;
299 char buf[100];
300 int i;
301
302 ldp_tlv_header = (const struct ldp_tlv_header *)tptr;
303 ND_TCHECK_SIZE(ldp_tlv_header);
304 tlv_len=GET_BE_U_2(ldp_tlv_header->length);
305 if (tlv_len + 4U > msg_tlen) {
306 ND_PRINT("\n\t\t TLV contents go past end of message");
307 return 0;
308 }
309 tlv_tlen=tlv_len;
310 tlv_type=LDP_MASK_TLV_TYPE(GET_BE_U_2(ldp_tlv_header->type));
311
312 /* FIXME vendor private / experimental check */
313 ND_PRINT("\n\t %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]",
314 tok2str(ldp_tlv_values,
315 "Unknown",
316 tlv_type),
317 tlv_type,
318 tlv_len,
319 LDP_MASK_U_BIT(GET_BE_U_2(ldp_tlv_header->type)) ? "continue processing" : "ignore",
320 LDP_MASK_F_BIT(GET_BE_U_2(ldp_tlv_header->type)) ? "do" : "don't");
321
322 tptr+=sizeof(struct ldp_tlv_header);
323
324 switch(tlv_type) {
325
326 case LDP_TLV_COMMON_HELLO:
327 TLV_TCHECK(4);
328 ND_PRINT("\n\t Hold Time: %us, Flags: [%s Hello%s]",
329 GET_BE_U_2(tptr),
330 (GET_BE_U_2(tptr + 2)&0x8000) ? "Targeted" : "Link",
331 (GET_BE_U_2(tptr + 2)&0x4000) ? ", Request for targeted Hellos" : "");
332 break;
333
334 case LDP_TLV_IPV4_TRANSPORT_ADDR:
335 TLV_TCHECK(4);
336 ND_PRINT("\n\t IPv4 Transport Address: %s", GET_IPADDR_STRING(tptr));
337 break;
338 case LDP_TLV_IPV6_TRANSPORT_ADDR:
339 TLV_TCHECK(16);
340 ND_PRINT("\n\t IPv6 Transport Address: %s", GET_IP6ADDR_STRING(tptr));
341 break;
342 case LDP_TLV_CONFIG_SEQ_NUMBER:
343 TLV_TCHECK(4);
344 ND_PRINT("\n\t Sequence Number: %u", GET_BE_U_4(tptr));
345 break;
346
347 case LDP_TLV_ADDRESS_LIST:
348 TLV_TCHECK(LDP_TLV_ADDRESS_LIST_AFNUM_LEN);
349 af = GET_BE_U_2(tptr);
350 tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
351 tlv_tlen -= LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
352 ND_PRINT("\n\t Address Family: %s, addresses",
353 tok2str(af_values, "Unknown (%u)", af));
354 switch (af) {
355 case AFNUM_IP:
356 while(tlv_tlen >= sizeof(nd_ipv4)) {
357 ND_PRINT(" %s", GET_IPADDR_STRING(tptr));
358 tlv_tlen-=sizeof(nd_ipv4);
359 tptr+=sizeof(nd_ipv4);
360 }
361 break;
362 case AFNUM_IP6:
363 while(tlv_tlen >= sizeof(nd_ipv6)) {
364 ND_PRINT(" %s", GET_IP6ADDR_STRING(tptr));
365 tlv_tlen-=sizeof(nd_ipv6);
366 tptr+=sizeof(nd_ipv6);
367 }
368 break;
369 default:
370 /* unknown AF */
371 break;
372 }
373 break;
374
375 case LDP_TLV_HOP_COUNT:
376 TLV_TCHECK(1);
377 ND_PRINT("\n\t Hop Count: %u", GET_U_1(tptr));
378 break;
379
380 case LDP_TLV_PATH_VECTOR:
381 TLV_TCHECK(4);
382 ND_PRINT("\n\t Path Vector: %s", GET_IPADDR_STRING(tptr));
383 tptr += 4;
384 tlv_tlen -= 4;
385 while (tlv_tlen >= 4) {
386 ND_PRINT(", %s", GET_IPADDR_STRING(tptr));
387 tptr += 4;
388 tlv_tlen -= 4;
389 }
390 break;
391
392 case LDP_TLV_COMMON_SESSION:
393 TLV_TCHECK(14);
394 ND_PRINT("\n\t Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
395 GET_BE_U_2(tptr), GET_BE_U_2(tptr + 2),
396 (GET_BE_U_2(tptr + 4)&0x8000) ? "On Demand" : "Unsolicited",
397 (GET_BE_U_2(tptr + 4)&0x4000) ? "Enabled" : "Disabled"
398 );
399 ND_PRINT("\n\t Path Vector Limit %u, Max-PDU length: %u, Receiver Label-Space-ID %s:%u",
400 GET_U_1(tptr+5),
401 GET_BE_U_2(tptr+6),
402 GET_IPADDR_STRING(tptr+8),
403 GET_BE_U_2(tptr+12)
404 );
405 break;
406
407 case LDP_TLV_FEC:
408 TLV_TCHECK(1);
409 fec_type = GET_U_1(tptr);
410 ND_PRINT("\n\t %s FEC (0x%02x)",
411 tok2str(ldp_fec_values, "Unknown", fec_type),
412 fec_type);
413
414 tptr+=1;
415 tlv_tlen-=1;
416 switch(fec_type) {
417
418 case LDP_FEC_WILDCARD:
419 break;
420 case LDP_FEC_PREFIX:
421 TLV_TCHECK(2);
422 af = GET_BE_U_2(tptr);
423 tptr+=2;
424 tlv_tlen-=2;
425 if (af == AFNUM_IP) {
426 i=decode_prefix4(ndo, tptr, tlv_tlen, buf, sizeof(buf));
427 if (i == -2)
428 goto trunc;
429 if (i == -3)
430 ND_PRINT(": IPv4 prefix (goes past end of TLV)");
431 else if (i == -1)
432 ND_PRINT(": IPv4 prefix (invalid length)");
433 else
434 ND_PRINT(": IPv4 prefix %s", buf);
435 } else if (af == AFNUM_IP6) {
436 i=decode_prefix6(ndo, tptr, tlv_tlen, buf, sizeof(buf));
437 if (i == -2)
438 goto trunc;
439 if (i == -3)
440 ND_PRINT(": IPv4 prefix (goes past end of TLV)");
441 else if (i == -1)
442 ND_PRINT(": IPv6 prefix (invalid length)");
443 else
444 ND_PRINT(": IPv6 prefix %s", buf);
445 } else
446 ND_PRINT(": Address family %u prefix", af);
447 break;
448 case LDP_FEC_HOSTADDRESS:
449 break;
450 case LDP_FEC_MARTINI_VC:
451 /*
452 * We assume the type was supposed to be one of the MPLS
453 * Pseudowire Types.
454 */
455 TLV_TCHECK(7);
456 vc_info_len = GET_U_1(tptr + 2);
457
458 /*
459 * According to RFC 4908, the VC info Length field can be zero,
460 * in which case not only are there no interface parameters,
461 * there's no VC ID.
462 */
463 if (vc_info_len == 0) {
464 ND_PRINT(": %s, %scontrol word, group-ID %u, VC-info-length: %u",
465 tok2str(mpls_pw_types_values, "Unknown", GET_BE_U_2(tptr)&0x7fff),
466 GET_BE_U_2(tptr)&0x8000 ? "" : "no ",
467 GET_BE_U_4(tptr + 3),
468 vc_info_len);
469 break;
470 }
471
472 /* Make sure we have the VC ID as well */
473 TLV_TCHECK(11);
474 ND_PRINT(": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
475 tok2str(mpls_pw_types_values, "Unknown", GET_BE_U_2(tptr)&0x7fff),
476 GET_BE_U_2(tptr)&0x8000 ? "" : "no ",
477 GET_BE_U_4(tptr + 3),
478 GET_BE_U_4(tptr + 7),
479 vc_info_len);
480 if (vc_info_len < 4) {
481 /* minimum 4, for the VC ID */
482 ND_PRINT(" (invalid, < 4");
483 return(tlv_len+4); /* Type & Length fields not included */
484 }
485 vc_info_len -= 4; /* subtract out the VC ID, giving the length of the interface parameters */
486
487 /* Skip past the fixed information and the VC ID */
488 tptr+=11;
489 tlv_tlen-=11;
490 TLV_TCHECK(vc_info_len);
491
492 while (vc_info_len > 2) {
493 vc_info_tlv_type = GET_U_1(tptr);
494 vc_info_tlv_len = GET_U_1(tptr + 1);
495 if (vc_info_tlv_len < 2)
496 break;
497 if (vc_info_len < vc_info_tlv_len)
498 break;
499
500 ND_PRINT("\n\t\tInterface Parameter: %s (0x%02x), len %u",
501 tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
502 vc_info_tlv_type,
503 vc_info_tlv_len);
504
505 switch(vc_info_tlv_type) {
506 case LDP_FEC_MARTINI_IFPARM_MTU:
507 ND_PRINT(": %u", GET_BE_U_2(tptr + 2));
508 break;
509
510 case LDP_FEC_MARTINI_IFPARM_DESC:
511 ND_PRINT(": ");
512 for (idx = 2; idx < vc_info_tlv_len; idx++)
513 fn_print_char(ndo, GET_U_1(tptr + idx));
514 break;
515
516 case LDP_FEC_MARTINI_IFPARM_VCCV:
517 ND_PRINT("\n\t\t Control Channels (0x%02x) = [%s]",
518 GET_U_1((tptr + 2)),
519 bittok2str(ldp_fec_martini_ifparm_vccv_cc_values, "none", GET_U_1((tptr + 2))));
520 ND_PRINT("\n\t\t CV Types (0x%02x) = [%s]",
521 GET_U_1((tptr + 3)),
522 bittok2str(ldp_fec_martini_ifparm_vccv_cv_values, "none", GET_U_1((tptr + 3))));
523 break;
524
525 default:
526 print_unknown_data(ndo, tptr+2, "\n\t\t ", vc_info_tlv_len-2);
527 break;
528 }
529
530 vc_info_len -= vc_info_tlv_len;
531 tptr += vc_info_tlv_len;
532 }
533 break;
534 }
535
536 break;
537
538 case LDP_TLV_GENERIC_LABEL:
539 TLV_TCHECK(4);
540 ND_PRINT("\n\t Label: %u", GET_BE_U_4(tptr) & 0xfffff);
541 break;
542
543 case LDP_TLV_STATUS:
544 TLV_TCHECK(10);
545 ui = GET_BE_U_4(tptr);
546 tptr+=4;
547 ND_PRINT("\n\t Status Code: %s, Flags: [%s and %s forward]",
548 tok2str(ldp_status_code_values, "Unknown", ui&0x3fffffff),
549 ui&0x80000000 ? "Fatal error" : "Advisory Notification",
550 ui&0x40000000 ? "do" : "don't");
551 ui = GET_BE_U_4(tptr);
552 tptr+=4;
553 if (ui)
554 ND_PRINT(", causing Message ID: 0x%08x", ui);
555 ui = GET_BE_U_2(tptr);
556 if (ui)
557 ND_PRINT(", Message Type: %s", tok2str(ldp_msg_values, "Unknown", ui));
558 break;
559
560 case LDP_TLV_FT_SESSION:
561 TLV_TCHECK(12);
562 ft_flags = GET_BE_U_2(tptr);
563 ND_PRINT("\n\t Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
564 ft_flags&0x8000 ? "" : "No ",
565 ft_flags&0x8 ? "" : "Don't ",
566 ft_flags&0x4 ? "" : "No ",
567 ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels",
568 ft_flags&0x1 ? "" : "Don't ");
569 /* 16 bits (FT Flags) + 16 bits (Reserved) */
570 tptr+=4;
571 ui = GET_BE_U_4(tptr);
572 if (ui)
573 ND_PRINT(", Reconnect Timeout: %ums", ui);
574 tptr+=4;
575 ui = GET_BE_U_4(tptr);
576 if (ui)
577 ND_PRINT(", Recovery Time: %ums", ui);
578 break;
579
580 case LDP_TLV_TYPED_WC_FEC_CAP:
581 TLV_TCHECK(1);
582 ND_PRINT("\n\t %s", GET_U_1(tptr)&0x80 ? "Support" : "No Support");
583 break;
584
585 case LDP_TLV_MTU:
586 TLV_TCHECK(2);
587 ND_PRINT("\n\t MTU: %u", GET_BE_U_2(tptr));
588 break;
589
590 case LDP_TLV_DUAL_STACK_CAP:
591 TLV_TCHECK(4);
592 transport_pref = GET_U_1(tptr);
593 ND_PRINT("\n\t Transport Connection Preference: %s",
594 tok2str(ldp_dual_stack_transport_pref_values,
595 "Unknown",
596 transport_pref));
597 break;
598
599
600 /*
601 * FIXME those are the defined TLVs that lack a decoder
602 * you are welcome to contribute code ;-)
603 */
604
605 case LDP_TLV_ATM_LABEL:
606 case LDP_TLV_FR_LABEL:
607 case LDP_TLV_EXTD_STATUS:
608 case LDP_TLV_RETURNED_PDU:
609 case LDP_TLV_RETURNED_MSG:
610 case LDP_TLV_ATM_SESSION_PARM:
611 case LDP_TLV_FR_SESSION_PARM:
612 case LDP_TLV_LABEL_REQUEST_MSG_ID:
613
614 default:
615 if (ndo->ndo_vflag <= 1)
616 print_unknown_data(ndo, tptr, "\n\t ", tlv_tlen);
617 break;
618 }
619 return(tlv_len+4); /* Type & Length fields not included */
620
621 trunc:
622 nd_trunc_longjmp(ndo);
623
624 invalid:
625 return(tlv_len+4); /* Type & Length fields not included */
626 }
627
628 void
629 ldp_print(netdissect_options *ndo,
630 const u_char *pptr, u_int len)
631 {
632 u_int processed;
633
634 ndo->ndo_protocol = "ldp";
635 while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
636 processed = ldp_pdu_print(ndo, pptr);
637 if (processed == 0)
638 return;
639 if (len < processed) {
640 ND_PRINT(" [remaining length %u < %u]", len, processed);
641 nd_print_invalid(ndo);
642 break;
643 }
644 len -= processed;
645 pptr += processed;
646 }
647 }
648
649 static u_int
650 ldp_pdu_print(netdissect_options *ndo,
651 const u_char *pptr)
652 {
653 const struct ldp_common_header *ldp_com_header;
654 const struct ldp_msg_header *ldp_msg_header;
655 const u_char *tptr,*msg_tptr;
656 u_short tlen;
657 u_short pdu_len,msg_len,msg_type;
658 u_int msg_tlen;
659 int hexdump,processed;
660
661 ldp_com_header = (const struct ldp_common_header *)pptr;
662 ND_TCHECK_SIZE(ldp_com_header);
663
664 /*
665 * Sanity checking of the header.
666 */
667 if (GET_BE_U_2(ldp_com_header->version) != LDP_VERSION) {
668 ND_PRINT("%sLDP version %u packet not supported",
669 (ndo->ndo_vflag < 1) ? "" : "\n\t",
670 GET_BE_U_2(ldp_com_header->version));
671 return 0;
672 }
673
674 pdu_len = GET_BE_U_2(ldp_com_header->pdu_length);
675 if (pdu_len < sizeof(struct ldp_common_header)-4) {
676 /* length too short */
677 ND_PRINT("%sLDP, pdu-length: %u (too short, < %zu)",
678 (ndo->ndo_vflag < 1) ? "" : "\n\t",
679 pdu_len,
680 sizeof(struct ldp_common_header)-4);
681 return 0;
682 }
683
684 /* print the LSR-ID, label-space & length */
685 ND_PRINT("%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
686 (ndo->ndo_vflag < 1) ? "" : "\n\t",
687 GET_IPADDR_STRING(ldp_com_header->lsr_id),
688 GET_BE_U_2(ldp_com_header->label_space),
689 pdu_len);
690
691 /* bail out if non-verbose */
692 if (ndo->ndo_vflag < 1)
693 return 0;
694
695 /* ok they seem to want to know everything - lets fully decode it */
696 tptr = pptr + sizeof(struct ldp_common_header);
697 tlen = pdu_len - (sizeof(struct ldp_common_header)-4); /* Type & Length fields not included */
698
699 while(tlen>0) {
700 /* did we capture enough for fully decoding the msg header ? */
701 ND_TCHECK_LEN(tptr, sizeof(struct ldp_msg_header));
702
703 ldp_msg_header = (const struct ldp_msg_header *)tptr;
704 msg_len=GET_BE_U_2(ldp_msg_header->length);
705 msg_type=LDP_MASK_MSG_TYPE(GET_BE_U_2(ldp_msg_header->type));
706
707 if (msg_len < sizeof(struct ldp_msg_header)-4) {
708 /* length too short */
709 /* FIXME vendor private / experimental check */
710 ND_PRINT("\n\t %s Message (0x%04x), length: %u (too short, < %zu)",
711 tok2str(ldp_msg_values,
712 "Unknown",
713 msg_type),
714 msg_type,
715 msg_len,
716 sizeof(struct ldp_msg_header)-4);
717 return 0;
718 }
719
720 /* FIXME vendor private / experimental check */
721 ND_PRINT("\n\t %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
722 tok2str(ldp_msg_values,
723 "Unknown",
724 msg_type),
725 msg_type,
726 msg_len,
727 GET_BE_U_4(ldp_msg_header->id),
728 LDP_MASK_U_BIT(GET_BE_U_2(ldp_msg_header->type)) ? "continue processing" : "ignore");
729
730 msg_tptr=tptr+sizeof(struct ldp_msg_header);
731 msg_tlen=msg_len-(sizeof(struct ldp_msg_header)-4); /* Type & Length fields not included */
732
733 /* did we capture enough for fully decoding the message ? */
734 ND_TCHECK_LEN(tptr, msg_len);
735 hexdump=FALSE;
736
737 switch(msg_type) {
738
739 case LDP_MSG_NOTIF:
740 case LDP_MSG_HELLO:
741 case LDP_MSG_INIT:
742 case LDP_MSG_KEEPALIVE:
743 case LDP_MSG_ADDRESS:
744 case LDP_MSG_LABEL_MAPPING:
745 case LDP_MSG_ADDRESS_WITHDRAW:
746 case LDP_MSG_LABEL_WITHDRAW:
747 case LDP_MSG_LABEL_REQUEST:
748 case LDP_MSG_LABEL_RELEASE:
749 case LDP_MSG_LABEL_ABORT_REQUEST:
750 while(msg_tlen >= 4) {
751 processed = ldp_tlv_print(ndo, msg_tptr, msg_tlen);
752 if (processed == 0)
753 break;
754 msg_tlen-=processed;
755 msg_tptr+=processed;
756 }
757 break;
758
759 default:
760 if (ndo->ndo_vflag <= 1)
761 print_unknown_data(ndo, msg_tptr, "\n\t ", msg_tlen);
762 break;
763 }
764 /* do we want to see an additionally hexdump ? */
765 if (ndo->ndo_vflag > 1 || hexdump==TRUE)
766 print_unknown_data(ndo, tptr+sizeof(struct ldp_msg_header), "\n\t ",
767 msg_len);
768
769 tptr += msg_len+4;
770 tlen -= msg_len+4;
771 }
772 return pdu_len+4;
773 trunc:
774 nd_trunc_longjmp(ndo);
775 }
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