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Squelch more warnings.
[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_LABEL_REQUEST_MSG_ID 0x0600
146 #define LDP_TLV_MTU 0x0601 /* rfc 3988 */
147
148 static const struct tok ldp_tlv_values[] = {
149 { LDP_TLV_FEC, "FEC" },
150 { LDP_TLV_ADDRESS_LIST, "Address List" },
151 { LDP_TLV_HOP_COUNT, "Hop Count" },
152 { LDP_TLV_PATH_VECTOR, "Path Vector" },
153 { LDP_TLV_GENERIC_LABEL, "Generic Label" },
154 { LDP_TLV_ATM_LABEL, "ATM Label" },
155 { LDP_TLV_FR_LABEL, "Frame-Relay Label" },
156 { LDP_TLV_STATUS, "Status" },
157 { LDP_TLV_EXTD_STATUS, "Extended Status" },
158 { LDP_TLV_RETURNED_PDU, "Returned PDU" },
159 { LDP_TLV_RETURNED_MSG, "Returned Message" },
160 { LDP_TLV_COMMON_HELLO, "Common Hello Parameters" },
161 { LDP_TLV_IPV4_TRANSPORT_ADDR, "IPv4 Transport Address" },
162 { LDP_TLV_CONFIG_SEQ_NUMBER, "Configuration Sequence Number" },
163 { LDP_TLV_IPV6_TRANSPORT_ADDR, "IPv6 Transport Address" },
164 { LDP_TLV_COMMON_SESSION, "Common Session Parameters" },
165 { LDP_TLV_ATM_SESSION_PARM, "ATM Session Parameters" },
166 { LDP_TLV_FR_SESSION_PARM, "Frame-Relay Session Parameters" },
167 { LDP_TLV_FT_SESSION, "Fault-Tolerant Session Parameters" },
168 { LDP_TLV_LABEL_REQUEST_MSG_ID, "Label Request Message ID" },
169 { LDP_TLV_MTU, "MTU" },
170 { 0, NULL}
171 };
172
173 #define LDP_FEC_WILDCARD 0x01
174 #define LDP_FEC_PREFIX 0x02
175 #define LDP_FEC_HOSTADDRESS 0x03
176 /* From RFC 4906; should probably be updated to RFC 4447 (e.g., VC -> PW) */
177 #define LDP_FEC_MARTINI_VC 0x80
178
179 static const struct tok ldp_fec_values[] = {
180 { LDP_FEC_WILDCARD, "Wildcard" },
181 { LDP_FEC_PREFIX, "Prefix" },
182 { LDP_FEC_HOSTADDRESS, "Host address" },
183 { LDP_FEC_MARTINI_VC, "Martini VC" },
184 { 0, NULL}
185 };
186
187 #define LDP_FEC_MARTINI_IFPARM_MTU 0x01
188 #define LDP_FEC_MARTINI_IFPARM_DESC 0x03
189 #define LDP_FEC_MARTINI_IFPARM_VCCV 0x0c
190
191 static const struct tok ldp_fec_martini_ifparm_values[] = {
192 { LDP_FEC_MARTINI_IFPARM_MTU, "MTU" },
193 { LDP_FEC_MARTINI_IFPARM_DESC, "Description" },
194 { LDP_FEC_MARTINI_IFPARM_VCCV, "VCCV" },
195 { 0, NULL}
196 };
197
198 /* draft-ietf-pwe3-vccv-04.txt */
199 static const struct tok ldp_fec_martini_ifparm_vccv_cc_values[] = {
200 { 0x01, "PWE3 control word" },
201 { 0x02, "MPLS Router Alert Label" },
202 { 0x04, "MPLS inner label TTL = 1" },
203 { 0, NULL}
204 };
205
206 /* draft-ietf-pwe3-vccv-04.txt */
207 static const struct tok ldp_fec_martini_ifparm_vccv_cv_values[] = {
208 { 0x01, "ICMP Ping" },
209 { 0x02, "LSP Ping" },
210 { 0x04, "BFD" },
211 { 0, NULL}
212 };
213
214 static int ldp_pdu_print(netdissect_options *, const u_char *);
215
216 /*
217 * ldp tlv header
218 *
219 * 0 1 2 3
220 * 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
221 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
222 * |U|F| Type | Length |
223 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
224 * | |
225 * | Value |
226 * ~ ~
227 * | |
228 * | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
229 * | |
230 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
231 */
232
233 #define TLV_TCHECK(minlen) \
234 ND_TCHECK_LEN(tptr, minlen); if (tlv_tlen < minlen) goto badtlv;
235
236 static u_int
237 ldp_tlv_print(netdissect_options *ndo,
238 const u_char *tptr,
239 u_int msg_tlen)
240 {
241 struct ldp_tlv_header {
242 nd_uint16_t type;
243 nd_uint16_t length;
244 };
245
246 const struct ldp_tlv_header *ldp_tlv_header;
247 u_short tlv_type,tlv_len,tlv_tlen,af,ft_flags;
248 u_char fec_type;
249 u_int ui,vc_info_len, vc_info_tlv_type, vc_info_tlv_len,idx;
250 char buf[100];
251 int i;
252
253 ldp_tlv_header = (const struct ldp_tlv_header *)tptr;
254 ND_TCHECK_SIZE(ldp_tlv_header);
255 tlv_len=GET_BE_U_2(ldp_tlv_header->length);
256 if (tlv_len + 4 > msg_tlen) {
257 ND_PRINT("\n\t\t TLV contents go past end of message");
258 return 0;
259 }
260 tlv_tlen=tlv_len;
261 tlv_type=LDP_MASK_TLV_TYPE(GET_BE_U_2(ldp_tlv_header->type));
262
263 /* FIXME vendor private / experimental check */
264 ND_PRINT("\n\t %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]",
265 tok2str(ldp_tlv_values,
266 "Unknown",
267 tlv_type),
268 tlv_type,
269 tlv_len,
270 LDP_MASK_U_BIT(GET_BE_U_2(ldp_tlv_header->type)) ? "continue processing" : "ignore",
271 LDP_MASK_F_BIT(GET_BE_U_2(ldp_tlv_header->type)) ? "do" : "don't");
272
273 tptr+=sizeof(struct ldp_tlv_header);
274
275 switch(tlv_type) {
276
277 case LDP_TLV_COMMON_HELLO:
278 TLV_TCHECK(4);
279 ND_PRINT("\n\t Hold Time: %us, Flags: [%s Hello%s]",
280 GET_BE_U_2(tptr),
281 (GET_BE_U_2(tptr + 2)&0x8000) ? "Targeted" : "Link",
282 (GET_BE_U_2(tptr + 2)&0x4000) ? ", Request for targeted Hellos" : "");
283 break;
284
285 case LDP_TLV_IPV4_TRANSPORT_ADDR:
286 TLV_TCHECK(4);
287 ND_PRINT("\n\t IPv4 Transport Address: %s", ipaddr_string(ndo, tptr));
288 break;
289 case LDP_TLV_IPV6_TRANSPORT_ADDR:
290 TLV_TCHECK(16);
291 ND_PRINT("\n\t IPv6 Transport Address: %s", ip6addr_string(ndo, tptr));
292 break;
293 case LDP_TLV_CONFIG_SEQ_NUMBER:
294 TLV_TCHECK(4);
295 ND_PRINT("\n\t Sequence Number: %u", GET_BE_U_4(tptr));
296 break;
297
298 case LDP_TLV_ADDRESS_LIST:
299 TLV_TCHECK(LDP_TLV_ADDRESS_LIST_AFNUM_LEN);
300 af = GET_BE_U_2(tptr);
301 tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
302 tlv_tlen -= LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
303 ND_PRINT("\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(nd_ipv4)) {
308 ND_TCHECK_LEN(tptr, sizeof(nd_ipv4));
309 ND_PRINT(" %s", ipaddr_string(ndo, tptr));
310 tlv_tlen-=sizeof(nd_ipv4);
311 tptr+=sizeof(nd_ipv4);
312 }
313 break;
314 case AFNUM_INET6:
315 while(tlv_tlen >= sizeof(nd_ipv6)) {
316 ND_TCHECK_LEN(tptr, sizeof(nd_ipv6));
317 ND_PRINT(" %s", ip6addr_string(ndo, tptr));
318 tlv_tlen-=sizeof(nd_ipv6);
319 tptr+=sizeof(nd_ipv6);
320 }
321 break;
322 default:
323 /* unknown AF */
324 break;
325 }
326 break;
327
328 case LDP_TLV_COMMON_SESSION:
329 TLV_TCHECK(8);
330 ND_PRINT("\n\t Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
331 GET_BE_U_2(tptr), GET_BE_U_2(tptr + 2),
332 (GET_BE_U_2(tptr + 6)&0x8000) ? "On Demand" : "Unsolicited",
333 (GET_BE_U_2(tptr + 6)&0x4000) ? "Enabled" : "Disabled"
334 );
335 break;
336
337 case LDP_TLV_FEC:
338 TLV_TCHECK(1);
339 fec_type = GET_U_1(tptr);
340 ND_PRINT("\n\t %s FEC (0x%02x)",
341 tok2str(ldp_fec_values, "Unknown", fec_type),
342 fec_type);
343
344 tptr+=1;
345 tlv_tlen-=1;
346 switch(fec_type) {
347
348 case LDP_FEC_WILDCARD:
349 break;
350 case LDP_FEC_PREFIX:
351 TLV_TCHECK(2);
352 af = GET_BE_U_2(tptr);
353 tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
354 tlv_tlen-=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
355 if (af == AFNUM_INET) {
356 i=decode_prefix4(ndo, tptr, tlv_tlen, buf, sizeof(buf));
357 if (i == -2)
358 goto trunc;
359 if (i == -3)
360 ND_PRINT(": IPv4 prefix (goes past end of TLV)");
361 else if (i == -1)
362 ND_PRINT(": IPv4 prefix (invalid length)");
363 else
364 ND_PRINT(": IPv4 prefix %s", buf);
365 }
366 else if (af == AFNUM_INET6) {
367 i=decode_prefix6(ndo, tptr, tlv_tlen, buf, sizeof(buf));
368 if (i == -2)
369 goto trunc;
370 if (i == -3)
371 ND_PRINT(": IPv4 prefix (goes past end of TLV)");
372 else if (i == -1)
373 ND_PRINT(": IPv6 prefix (invalid length)");
374 else
375 ND_PRINT(": IPv6 prefix %s", buf);
376 }
377 else
378 ND_PRINT(": Address family %u prefix", af);
379 break;
380 case LDP_FEC_HOSTADDRESS:
381 break;
382 case LDP_FEC_MARTINI_VC:
383 /*
384 * We assume the type was supposed to be one of the MPLS
385 * Pseudowire Types.
386 */
387 TLV_TCHECK(7);
388 vc_info_len = GET_U_1(tptr + 2);
389
390 /*
391 * According to RFC 4908, the VC info Length field can be zero,
392 * in which case not only are there no interface parameters,
393 * there's no VC ID.
394 */
395 if (vc_info_len == 0) {
396 ND_PRINT(": %s, %scontrol word, group-ID %u, VC-info-length: %u",
397 tok2str(mpls_pw_types_values, "Unknown", GET_BE_U_2(tptr)&0x7fff),
398 GET_BE_U_2(tptr)&0x8000 ? "" : "no ",
399 GET_BE_U_4(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(": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
407 tok2str(mpls_pw_types_values, "Unknown", GET_BE_U_2(tptr)&0x7fff),
408 GET_BE_U_2(tptr)&0x8000 ? "" : "no ",
409 GET_BE_U_4(tptr + 3),
410 GET_BE_U_4(tptr + 7),
411 vc_info_len);
412 if (vc_info_len < 4) {
413 /* minimum 4, for the VC ID */
414 ND_PRINT(" (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 = GET_U_1(tptr);
426 vc_info_tlv_len = GET_U_1(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("\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(": %u", GET_BE_U_2(tptr + 2));
440 break;
441
442 case LDP_FEC_MARTINI_IFPARM_DESC:
443 ND_PRINT(": ");
444 for (idx = 2; idx < vc_info_tlv_len; idx++)
445 fn_print_char(ndo, GET_U_1(tptr + idx));
446 break;
447
448 case LDP_FEC_MARTINI_IFPARM_VCCV:
449 ND_PRINT("\n\t\t Control Channels (0x%02x) = [%s]",
450 GET_U_1((tptr + 2)),
451 bittok2str(ldp_fec_martini_ifparm_vccv_cc_values, "none", GET_U_1((tptr + 2))));
452 ND_PRINT("\n\t\t CV Types (0x%02x) = [%s]",
453 GET_U_1((tptr + 3)),
454 bittok2str(ldp_fec_martini_ifparm_vccv_cv_values, "none", GET_U_1((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("\n\t Label: %u", GET_BE_U_4(tptr) & 0xfffff);
473 break;
474
475 case LDP_TLV_STATUS:
476 TLV_TCHECK(8);
477 ui = GET_BE_U_4(tptr);
478 tptr+=4;
479 ND_PRINT("\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 = GET_BE_U_4(tptr);
484 tptr+=4;
485 if (ui)
486 ND_PRINT(", causing Message ID: 0x%08x", ui);
487 break;
488
489 case LDP_TLV_FT_SESSION:
490 TLV_TCHECK(8);
491 ft_flags = GET_BE_U_2(tptr);
492 ND_PRINT("\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 = GET_BE_U_4(tptr);
500 if (ui)
501 ND_PRINT(", Reconnect Timeout: %ums", ui);
502 tptr+=4;
503 ui = GET_BE_U_4(tptr);
504 if (ui)
505 ND_PRINT(", Recovery Time: %ums", ui);
506 break;
507
508 case LDP_TLV_MTU:
509 TLV_TCHECK(2);
510 ND_PRINT("\n\t MTU: %u", GET_BE_U_2(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_trunc(ndo);
539 return 0;
540
541 badtlv:
542 ND_PRINT("\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 const u_char *pptr, u_int len)
549 {
550 int processed;
551
552 ndo->ndo_protocol = "ldp";
553 while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
554 processed = ldp_pdu_print(ndo, pptr);
555 if (processed == 0)
556 return;
557 len -= processed;
558 pptr += processed;
559 }
560 }
561
562 static int
563 ldp_pdu_print(netdissect_options *ndo,
564 const u_char *pptr)
565 {
566 const struct ldp_common_header *ldp_com_header;
567 const struct ldp_msg_header *ldp_msg_header;
568 const u_char *tptr,*msg_tptr;
569 u_short tlen;
570 u_short pdu_len,msg_len,msg_type;
571 u_int msg_tlen;
572 int hexdump,processed;
573
574 ldp_com_header = (const struct ldp_common_header *)pptr;
575 ND_TCHECK_SIZE(ldp_com_header);
576
577 /*
578 * Sanity checking of the header.
579 */
580 if (GET_BE_U_2(ldp_com_header->version) != LDP_VERSION) {
581 ND_PRINT("%sLDP version %u packet not supported",
582 (ndo->ndo_vflag < 1) ? "" : "\n\t",
583 GET_BE_U_2(ldp_com_header->version));
584 return 0;
585 }
586
587 pdu_len = GET_BE_U_2(ldp_com_header->pdu_length);
588 if (pdu_len < sizeof(struct ldp_common_header)-4) {
589 /* length too short */
590 ND_PRINT("%sLDP, pdu-length: %u (too short, < %u)",
591 (ndo->ndo_vflag < 1) ? "" : "\n\t",
592 pdu_len,
593 (u_int)(sizeof(struct ldp_common_header)-4));
594 return 0;
595 }
596
597 /* print the LSR-ID, label-space & length */
598 ND_PRINT("%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
599 (ndo->ndo_vflag < 1) ? "" : "\n\t",
600 ipaddr_string(ndo, ldp_com_header->lsr_id),
601 GET_BE_U_2(ldp_com_header->label_space),
602 pdu_len);
603
604 /* bail out if non-verbose */
605 if (ndo->ndo_vflag < 1)
606 return 0;
607
608 /* ok they seem to want to know everything - lets fully decode it */
609 tptr = pptr + sizeof(struct ldp_common_header);
610 tlen = pdu_len - (sizeof(struct ldp_common_header)-4); /* Type & Length fields not included */
611
612 while(tlen>0) {
613 /* did we capture enough for fully decoding the msg header ? */
614 ND_TCHECK_LEN(tptr, sizeof(struct ldp_msg_header));
615
616 ldp_msg_header = (const struct ldp_msg_header *)tptr;
617 msg_len=GET_BE_U_2(ldp_msg_header->length);
618 msg_type=LDP_MASK_MSG_TYPE(GET_BE_U_2(ldp_msg_header->type));
619
620 if (msg_len < sizeof(struct ldp_msg_header)-4) {
621 /* length too short */
622 /* FIXME vendor private / experimental check */
623 ND_PRINT("\n\t %s Message (0x%04x), length: %u (too short, < %u)",
624 tok2str(ldp_msg_values,
625 "Unknown",
626 msg_type),
627 msg_type,
628 msg_len,
629 (u_int)(sizeof(struct ldp_msg_header)-4));
630 return 0;
631 }
632
633 /* FIXME vendor private / experimental check */
634 ND_PRINT("\n\t %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
635 tok2str(ldp_msg_values,
636 "Unknown",
637 msg_type),
638 msg_type,
639 msg_len,
640 GET_BE_U_4(ldp_msg_header->id),
641 LDP_MASK_U_BIT(GET_BE_U_2(ldp_msg_header->type)) ? "continue processing" : "ignore");
642
643 msg_tptr=tptr+sizeof(struct ldp_msg_header);
644 msg_tlen=msg_len-(sizeof(struct ldp_msg_header)-4); /* Type & Length fields not included */
645
646 /* did we capture enough for fully decoding the message ? */
647 ND_TCHECK_LEN(tptr, msg_len);
648 hexdump=FALSE;
649
650 switch(msg_type) {
651
652 case LDP_MSG_NOTIF:
653 case LDP_MSG_HELLO:
654 case LDP_MSG_INIT:
655 case LDP_MSG_KEEPALIVE:
656 case LDP_MSG_ADDRESS:
657 case LDP_MSG_LABEL_MAPPING:
658 case LDP_MSG_ADDRESS_WITHDRAW:
659 case LDP_MSG_LABEL_WITHDRAW:
660 while(msg_tlen >= 4) {
661 processed = ldp_tlv_print(ndo, msg_tptr, msg_tlen);
662 if (processed == 0)
663 break;
664 msg_tlen-=processed;
665 msg_tptr+=processed;
666 }
667 break;
668
669 /*
670 * FIXME those are the defined messages that lack a decoder
671 * you are welcome to contribute code ;-)
672 */
673
674 case LDP_MSG_LABEL_REQUEST:
675 case LDP_MSG_LABEL_RELEASE:
676 case LDP_MSG_LABEL_ABORT_REQUEST:
677
678 default:
679 if (ndo->ndo_vflag <= 1)
680 print_unknown_data(ndo, msg_tptr, "\n\t ", msg_tlen);
681 break;
682 }
683 /* do we want to see an additionally hexdump ? */
684 if (ndo->ndo_vflag > 1 || hexdump==TRUE)
685 print_unknown_data(ndo, tptr+sizeof(struct ldp_msg_header), "\n\t ",
686 msg_len);
687
688 tptr += msg_len+4;
689 tlen -= msg_len+4;
690 }
691 return pdu_len+4;
692 trunc:
693 nd_print_trunc(ndo);
694 return 0;
695 }
[mirror] the TCPdump network dissector