tcpdump  4.99.1
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print-ldp.c
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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 
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 
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 
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 u_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  if (tlv_tlen < minlen) { \
235  ND_PRINT(" [tlv length %u < %u]", tlv_tlen, minlen); \
236  nd_print_invalid(ndo); \
237  goto invalid; \
238  }
239 
240 static u_int
242  const u_char *tptr,
243  u_int msg_tlen)
244 {
245  struct ldp_tlv_header {
246  nd_uint16_t type;
247  nd_uint16_t length;
248  };
249 
250  const struct ldp_tlv_header *ldp_tlv_header;
251  u_short tlv_type,tlv_len,tlv_tlen,af,ft_flags;
252  u_char fec_type;
253  u_int ui,vc_info_len, vc_info_tlv_type, vc_info_tlv_len,idx;
254  char buf[100];
255  int i;
256 
257  ldp_tlv_header = (const struct ldp_tlv_header *)tptr;
258  ND_TCHECK_SIZE(ldp_tlv_header);
259  tlv_len=GET_BE_U_2(ldp_tlv_header->length);
260  if (tlv_len + 4U > msg_tlen) {
261  ND_PRINT("\n\t\t TLV contents go past end of message");
262  return 0;
263  }
264  tlv_tlen=tlv_len;
265  tlv_type=LDP_MASK_TLV_TYPE(GET_BE_U_2(ldp_tlv_header->type));
266 
267  /* FIXME vendor private / experimental check */
268  ND_PRINT("\n\t %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]",
270  "Unknown",
271  tlv_type),
272  tlv_type,
273  tlv_len,
274  LDP_MASK_U_BIT(GET_BE_U_2(ldp_tlv_header->type)) ? "continue processing" : "ignore",
275  LDP_MASK_F_BIT(GET_BE_U_2(ldp_tlv_header->type)) ? "do" : "don't");
276 
277  tptr+=sizeof(struct ldp_tlv_header);
278 
279  switch(tlv_type) {
280 
282  TLV_TCHECK(4);
283  ND_PRINT("\n\t Hold Time: %us, Flags: [%s Hello%s]",
284  GET_BE_U_2(tptr),
285  (GET_BE_U_2(tptr + 2)&0x8000) ? "Targeted" : "Link",
286  (GET_BE_U_2(tptr + 2)&0x4000) ? ", Request for targeted Hellos" : "");
287  break;
288 
290  TLV_TCHECK(4);
291  ND_PRINT("\n\t IPv4 Transport Address: %s", GET_IPADDR_STRING(tptr));
292  break;
294  TLV_TCHECK(16);
295  ND_PRINT("\n\t IPv6 Transport Address: %s", GET_IP6ADDR_STRING(tptr));
296  break;
298  TLV_TCHECK(4);
299  ND_PRINT("\n\t Sequence Number: %u", GET_BE_U_4(tptr));
300  break;
301 
304  af = GET_BE_U_2(tptr);
306  tlv_tlen -= LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
307  ND_PRINT("\n\t Address Family: %s, addresses",
308  tok2str(af_values, "Unknown (%u)", af));
309  switch (af) {
310  case AFNUM_INET:
311  while(tlv_tlen >= sizeof(nd_ipv4)) {
312  ND_PRINT(" %s", GET_IPADDR_STRING(tptr));
313  tlv_tlen-=sizeof(nd_ipv4);
314  tptr+=sizeof(nd_ipv4);
315  }
316  break;
317  case AFNUM_INET6:
318  while(tlv_tlen >= sizeof(nd_ipv6)) {
319  ND_PRINT(" %s", GET_IP6ADDR_STRING(tptr));
320  tlv_tlen-=sizeof(nd_ipv6);
321  tptr+=sizeof(nd_ipv6);
322  }
323  break;
324  default:
325  /* unknown AF */
326  break;
327  }
328  break;
329 
331  TLV_TCHECK(8);
332  ND_PRINT("\n\t Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
333  GET_BE_U_2(tptr), GET_BE_U_2(tptr + 2),
334  (GET_BE_U_2(tptr + 6)&0x8000) ? "On Demand" : "Unsolicited",
335  (GET_BE_U_2(tptr + 6)&0x4000) ? "Enabled" : "Disabled"
336  );
337  break;
338 
339  case LDP_TLV_FEC:
340  TLV_TCHECK(1);
341  fec_type = GET_U_1(tptr);
342  ND_PRINT("\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 = GET_BE_U_2(tptr);
355  tptr+=2;
356  tlv_tlen-=2;
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(": IPv4 prefix (goes past end of TLV)");
363  else if (i == -1)
364  ND_PRINT(": IPv4 prefix (invalid length)");
365  else
366  ND_PRINT(": IPv4 prefix %s", buf);
367  }
368  else if (af == AFNUM_INET6) {
369  i=decode_prefix6(ndo, tptr, tlv_tlen, buf, sizeof(buf));
370  if (i == -2)
371  goto trunc;
372  if (i == -3)
373  ND_PRINT(": IPv4 prefix (goes past end of TLV)");
374  else if (i == -1)
375  ND_PRINT(": IPv6 prefix (invalid length)");
376  else
377  ND_PRINT(": IPv6 prefix %s", buf);
378  }
379  else
380  ND_PRINT(": Address family %u prefix", af);
381  break;
382  case LDP_FEC_HOSTADDRESS:
383  break;
384  case LDP_FEC_MARTINI_VC:
385  /*
386  * We assume the type was supposed to be one of the MPLS
387  * Pseudowire Types.
388  */
389  TLV_TCHECK(7);
390  vc_info_len = GET_U_1(tptr + 2);
391 
392  /*
393  * According to RFC 4908, the VC info Length field can be zero,
394  * in which case not only are there no interface parameters,
395  * there's no VC ID.
396  */
397  if (vc_info_len == 0) {
398  ND_PRINT(": %s, %scontrol word, group-ID %u, VC-info-length: %u",
399  tok2str(mpls_pw_types_values, "Unknown", GET_BE_U_2(tptr)&0x7fff),
400  GET_BE_U_2(tptr)&0x8000 ? "" : "no ",
401  GET_BE_U_4(tptr + 3),
402  vc_info_len);
403  break;
404  }
405 
406  /* Make sure we have the VC ID as well */
407  TLV_TCHECK(11);
408  ND_PRINT(": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
409  tok2str(mpls_pw_types_values, "Unknown", GET_BE_U_2(tptr)&0x7fff),
410  GET_BE_U_2(tptr)&0x8000 ? "" : "no ",
411  GET_BE_U_4(tptr + 3),
412  GET_BE_U_4(tptr + 7),
413  vc_info_len);
414  if (vc_info_len < 4) {
415  /* minimum 4, for the VC ID */
416  ND_PRINT(" (invalid, < 4");
417  return(tlv_len+4); /* Type & Length fields not included */
418  }
419  vc_info_len -= 4; /* subtract out the VC ID, giving the length of the interface parameters */
420 
421  /* Skip past the fixed information and the VC ID */
422  tptr+=11;
423  tlv_tlen-=11;
424  TLV_TCHECK(vc_info_len);
425 
426  while (vc_info_len > 2) {
427  vc_info_tlv_type = GET_U_1(tptr);
428  vc_info_tlv_len = GET_U_1(tptr + 1);
429  if (vc_info_tlv_len < 2)
430  break;
431  if (vc_info_len < vc_info_tlv_len)
432  break;
433 
434  ND_PRINT("\n\t\tInterface Parameter: %s (0x%02x), len %u",
435  tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
436  vc_info_tlv_type,
437  vc_info_tlv_len);
438 
439  switch(vc_info_tlv_type) {
441  ND_PRINT(": %u", GET_BE_U_2(tptr + 2));
442  break;
443 
445  ND_PRINT(": ");
446  for (idx = 2; idx < vc_info_tlv_len; idx++)
447  fn_print_char(ndo, GET_U_1(tptr + idx));
448  break;
449 
451  ND_PRINT("\n\t\t Control Channels (0x%02x) = [%s]",
452  GET_U_1((tptr + 2)),
454  ND_PRINT("\n\t\t CV Types (0x%02x) = [%s]",
455  GET_U_1((tptr + 3)),
457  break;
458 
459  default:
460  print_unknown_data(ndo, tptr+2, "\n\t\t ", vc_info_tlv_len-2);
461  break;
462  }
463 
464  vc_info_len -= vc_info_tlv_len;
465  tptr += vc_info_tlv_len;
466  }
467  break;
468  }
469 
470  break;
471 
473  TLV_TCHECK(4);
474  ND_PRINT("\n\t Label: %u", GET_BE_U_4(tptr) & 0xfffff);
475  break;
476 
477  case LDP_TLV_STATUS:
478  TLV_TCHECK(8);
479  ui = GET_BE_U_4(tptr);
480  tptr+=4;
481  ND_PRINT("\n\t Status: 0x%02x, Flags: [%s and %s forward]",
482  ui&0x3fffffff,
483  ui&0x80000000 ? "Fatal error" : "Advisory Notification",
484  ui&0x40000000 ? "do" : "don't");
485  ui = GET_BE_U_4(tptr);
486  tptr+=4;
487  if (ui)
488  ND_PRINT(", causing Message ID: 0x%08x", ui);
489  break;
490 
491  case LDP_TLV_FT_SESSION:
492  TLV_TCHECK(12);
493  ft_flags = GET_BE_U_2(tptr);
494  ND_PRINT("\n\t Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
495  ft_flags&0x8000 ? "" : "No ",
496  ft_flags&0x8 ? "" : "Don't ",
497  ft_flags&0x4 ? "" : "No ",
498  ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels",
499  ft_flags&0x1 ? "" : "Don't ");
500  /* 16 bits (FT Flags) + 16 bits (Reserved) */
501  tptr+=4;
502  ui = GET_BE_U_4(tptr);
503  if (ui)
504  ND_PRINT(", Reconnect Timeout: %ums", ui);
505  tptr+=4;
506  ui = GET_BE_U_4(tptr);
507  if (ui)
508  ND_PRINT(", Recovery Time: %ums", ui);
509  break;
510 
511  case LDP_TLV_MTU:
512  TLV_TCHECK(2);
513  ND_PRINT("\n\t MTU: %u", GET_BE_U_2(tptr));
514  break;
515 
516 
517  /*
518  * FIXME those are the defined TLVs that lack a decoder
519  * you are welcome to contribute code ;-)
520  */
521 
522  case LDP_TLV_HOP_COUNT:
523  case LDP_TLV_PATH_VECTOR:
524  case LDP_TLV_ATM_LABEL:
525  case LDP_TLV_FR_LABEL:
526  case LDP_TLV_EXTD_STATUS:
532 
533  default:
534  if (ndo->ndo_vflag <= 1)
535  print_unknown_data(ndo, tptr, "\n\t ", tlv_tlen);
536  break;
537  }
538  return(tlv_len+4); /* Type & Length fields not included */
539 
540 trunc:
541  nd_trunc_longjmp(ndo);
542 
543 invalid:
544  return(tlv_len+4); /* Type & Length fields not included */
545 }
546 
547 void
549  const u_char *pptr, u_int len)
550 {
551  u_int processed;
552 
553  ndo->ndo_protocol = "ldp";
554  while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
555  processed = ldp_pdu_print(ndo, pptr);
556  if (processed == 0)
557  return;
558  if (len < processed) {
559  ND_PRINT(" [remaining length %u < %u]", len, processed);
560  nd_print_invalid(ndo);
561  break;
562  }
563  len -= processed;
564  pptr += processed;
565  }
566 }
567 
568 static u_int
570  const u_char *pptr)
571 {
572  const struct ldp_common_header *ldp_com_header;
573  const struct ldp_msg_header *ldp_msg_header;
574  const u_char *tptr,*msg_tptr;
575  u_short tlen;
576  u_short pdu_len,msg_len,msg_type;
577  u_int msg_tlen;
578  int hexdump,processed;
579 
580  ldp_com_header = (const struct ldp_common_header *)pptr;
581  ND_TCHECK_SIZE(ldp_com_header);
582 
583  /*
584  * Sanity checking of the header.
585  */
586  if (GET_BE_U_2(ldp_com_header->version) != LDP_VERSION) {
587  ND_PRINT("%sLDP version %u packet not supported",
588  (ndo->ndo_vflag < 1) ? "" : "\n\t",
589  GET_BE_U_2(ldp_com_header->version));
590  return 0;
591  }
592 
593  pdu_len = GET_BE_U_2(ldp_com_header->pdu_length);
594  if (pdu_len < sizeof(struct ldp_common_header)-4) {
595  /* length too short */
596  ND_PRINT("%sLDP, pdu-length: %u (too short, < %zu)",
597  (ndo->ndo_vflag < 1) ? "" : "\n\t",
598  pdu_len,
599  sizeof(struct ldp_common_header)-4);
600  return 0;
601  }
602 
603  /* print the LSR-ID, label-space & length */
604  ND_PRINT("%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
605  (ndo->ndo_vflag < 1) ? "" : "\n\t",
606  GET_IPADDR_STRING(ldp_com_header->lsr_id),
607  GET_BE_U_2(ldp_com_header->label_space),
608  pdu_len);
609 
610  /* bail out if non-verbose */
611  if (ndo->ndo_vflag < 1)
612  return 0;
613 
614  /* ok they seem to want to know everything - lets fully decode it */
615  tptr = pptr + sizeof(struct ldp_common_header);
616  tlen = pdu_len - (sizeof(struct ldp_common_header)-4); /* Type & Length fields not included */
617 
618  while(tlen>0) {
619  /* did we capture enough for fully decoding the msg header ? */
620  ND_TCHECK_LEN(tptr, sizeof(struct ldp_msg_header));
621 
622  ldp_msg_header = (const struct ldp_msg_header *)tptr;
623  msg_len=GET_BE_U_2(ldp_msg_header->length);
625 
626  if (msg_len < sizeof(struct ldp_msg_header)-4) {
627  /* length too short */
628  /* FIXME vendor private / experimental check */
629  ND_PRINT("\n\t %s Message (0x%04x), length: %u (too short, < %zu)",
631  "Unknown",
632  msg_type),
633  msg_type,
634  msg_len,
635  sizeof(struct ldp_msg_header)-4);
636  return 0;
637  }
638 
639  /* FIXME vendor private / experimental check */
640  ND_PRINT("\n\t %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
642  "Unknown",
643  msg_type),
644  msg_type,
645  msg_len,
647  LDP_MASK_U_BIT(GET_BE_U_2(ldp_msg_header->type)) ? "continue processing" : "ignore");
648 
649  msg_tptr=tptr+sizeof(struct ldp_msg_header);
650  msg_tlen=msg_len-(sizeof(struct ldp_msg_header)-4); /* Type & Length fields not included */
651 
652  /* did we capture enough for fully decoding the message ? */
653  ND_TCHECK_LEN(tptr, msg_len);
654  hexdump=FALSE;
655 
656  switch(msg_type) {
657 
658  case LDP_MSG_NOTIF:
659  case LDP_MSG_HELLO:
660  case LDP_MSG_INIT:
661  case LDP_MSG_KEEPALIVE:
662  case LDP_MSG_ADDRESS:
666  while(msg_tlen >= 4) {
667  processed = ldp_tlv_print(ndo, msg_tptr, msg_tlen);
668  if (processed == 0)
669  break;
670  msg_tlen-=processed;
671  msg_tptr+=processed;
672  }
673  break;
674 
675  /*
676  * FIXME those are the defined messages that lack a decoder
677  * you are welcome to contribute code ;-)
678  */
679 
683 
684  default:
685  if (ndo->ndo_vflag <= 1)
686  print_unknown_data(ndo, msg_tptr, "\n\t ", msg_tlen);
687  break;
688  }
689  /* do we want to see an additionally hexdump ? */
690  if (ndo->ndo_vflag > 1 || hexdump==TRUE)
691  print_unknown_data(ndo, tptr+sizeof(struct ldp_msg_header), "\n\t ",
692  msg_len);
693 
694  tptr += msg_len+4;
695  tlen -= msg_len+4;
696  }
697  return pdu_len+4;
698 trunc:
699  nd_trunc_longjmp(ndo);
700 }
#define GET_IPADDR_STRING(p)
Definition: addrtoname.h:120
#define GET_IP6ADDR_STRING(p)
Definition: addrtoname.h:121
const struct tok af_values[]
Definition: af.c:26
#define AFNUM_INET6
Definition: af.h:23
#define AFNUM_INET
Definition: af.h:22
#define GET_BE_U_4(p)
Definition: extract.h:877
#define GET_BE_U_2(p)
Definition: extract.h:875
#define GET_U_1(p)
Definition: extract.h:872
static void nd_trunc_longjmp(netdissect_options *ndo)
Definition: extract.h:579
const struct tok mpls_pw_types_values[]
Definition: l2vpn.c:66
#define TRUE
#define FALSE
unsigned char nd_uint16_t[2]
Definition: netdissect.h:47
int decode_prefix6(netdissect_options *, const u_char *, u_int, char *, size_t)
Definition: print-bgp.c:1366
void fn_print_char(netdissect_options *, u_char)
Definition: util-print.c:70
int print_unknown_data(netdissect_options *, const u_char *, const char *, u_int)
Definition: util-print.c:441
#define ND_TCHECK_LEN(p, l)
Definition: netdissect.h:368
const char * tok2str(const struct tok *, const char *, u_int)
Definition: util-print.c:485
#define ND_TCHECK_SIZE(p)
Definition: netdissect.h:372
char * bittok2str(const struct tok *, const char *, u_int)
Definition: util-print.c:558
void nd_print_invalid(netdissect_options *)
Definition: util-print.c:429
unsigned char nd_ipv4[4]
Definition: netdissect.h:92
int decode_prefix4(netdissect_options *, const u_char *, u_int, char *, size_t)
Definition: print-bgp.c:586
#define ND_PRINT(...)
Definition: netdissect.h:385
unsigned char nd_uint32_t[4]
Definition: netdissect.h:49
unsigned char nd_ipv6[16]
Definition: netdissect.h:97
#define LDP_TLV_RETURNED_PDU
Definition: print-ldp.c:135
#define LDP_TLV_CONFIG_SEQ_NUMBER
Definition: print-ldp.c:139
#define LDP_FEC_HOSTADDRESS
Definition: print-ldp.c:175
#define LDP_MSG_INIT
Definition: print-ldp.c:92
#define LDP_TLV_PATH_VECTOR
Definition: print-ldp.c:129
#define LDP_MSG_LABEL_MAPPING
Definition: print-ldp.c:96
#define LDP_TLV_FR_SESSION_PARM
Definition: print-ldp.c:143
#define LDP_MASK_U_BIT(x)
Definition: print-ldp.c:88
#define LDP_MSG_KEEPALIVE
Definition: print-ldp.c:93
static const struct tok ldp_fec_martini_ifparm_vccv_cc_values[]
Definition: print-ldp.c:199
static const struct tok ldp_msg_values[]
Definition: print-ldp.c:107
#define LDP_TLV_STATUS
Definition: print-ldp.c:133
void ldp_print(netdissect_options *ndo, const u_char *pptr, u_int len)
Definition: print-ldp.c:548
#define LDP_MSG_LABEL_REQUEST
Definition: print-ldp.c:97
#define LDP_MSG_ADDRESS
Definition: print-ldp.c:94
#define LDP_FEC_MARTINI_IFPARM_VCCV
Definition: print-ldp.c:189
#define LDP_TLV_FR_LABEL
Definition: print-ldp.c:132
static const struct tok ldp_tlv_values[]
Definition: print-ldp.c:148
static const struct tok ldp_fec_martini_ifparm_values[]
Definition: print-ldp.c:191
#define LDP_MASK_F_BIT(x)
Definition: print-ldp.c:123
#define LDP_TLV_RETURNED_MSG
Definition: print-ldp.c:136
#define LDP_TLV_FEC
Definition: print-ldp.c:125
#define LDP_MSG_HELLO
Definition: print-ldp.c:91
#define LDP_TLV_COMMON_HELLO
Definition: print-ldp.c:137
static u_int ldp_tlv_print(netdissect_options *ndo, const u_char *tptr, u_int msg_tlen)
Definition: print-ldp.c:241
#define LDP_TLV_ADDRESS_LIST_AFNUM_LEN
Definition: print-ldp.c:127
static u_int ldp_pdu_print(netdissect_options *, const u_char *)
Definition: print-ldp.c:569
#define LDP_TLV_MTU
Definition: print-ldp.c:146
#define LDP_MASK_MSG_TYPE(x)
Definition: print-ldp.c:87
#define LDP_VERSION
Definition: print-ldp.c:55
#define LDP_FEC_WILDCARD
Definition: print-ldp.c:173
#define LDP_FEC_PREFIX
Definition: print-ldp.c:174
#define LDP_MSG_LABEL_RELEASE
Definition: print-ldp.c:99
#define TLV_TCHECK(minlen)
Definition: print-ldp.c:233
#define LDP_FEC_MARTINI_IFPARM_DESC
Definition: print-ldp.c:188
#define LDP_FEC_MARTINI_VC
Definition: print-ldp.c:177
#define LDP_TLV_LABEL_REQUEST_MSG_ID
Definition: print-ldp.c:145
#define LDP_TLV_FT_SESSION
Definition: print-ldp.c:144
#define LDP_MSG_LABEL_WITHDRAW
Definition: print-ldp.c:98
static const struct tok ldp_fec_values[]
Definition: print-ldp.c:179
#define LDP_TLV_ATM_SESSION_PARM
Definition: print-ldp.c:142
static const struct tok ldp_fec_martini_ifparm_vccv_cv_values[]
Definition: print-ldp.c:207
#define LDP_TLV_ATM_LABEL
Definition: print-ldp.c:131
#define LDP_TLV_GENERIC_LABEL
Definition: print-ldp.c:130
#define LDP_TLV_IPV4_TRANSPORT_ADDR
Definition: print-ldp.c:138
#define LDP_TLV_IPV6_TRANSPORT_ADDR
Definition: print-ldp.c:140
#define LDP_TLV_COMMON_SESSION
Definition: print-ldp.c:141
#define LDP_TLV_EXTD_STATUS
Definition: print-ldp.c:134
#define LDP_TLV_ADDRESS_LIST
Definition: print-ldp.c:126
#define LDP_MSG_ADDRESS_WITHDRAW
Definition: print-ldp.c:95
#define LDP_FEC_MARTINI_IFPARM_MTU
Definition: print-ldp.c:187
#define LDP_TLV_HOP_COUNT
Definition: print-ldp.c:128
#define LDP_MSG_LABEL_ABORT_REQUEST
Definition: print-ldp.c:100
#define LDP_MASK_TLV_TYPE(x)
Definition: print-ldp.c:122
#define LDP_MSG_NOTIF
Definition: print-ldp.c:90
nd_uint16_t label_space
Definition: print-ldp.c:52
nd_uint16_t pdu_length
Definition: print-ldp.c:50
nd_ipv4 lsr_id
Definition: print-ldp.c:51
nd_uint16_t version
Definition: print-ldp.c:49
nd_uint16_t length
Definition: print-ldp.c:83
nd_uint32_t id
Definition: print-ldp.c:84
nd_uint16_t type
Definition: print-ldp.c:82
const char * ndo_protocol
Definition: netdissect.h:218