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[tcpdump] / print-l2tp.c
1 /*
2 * Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
21 * L2TP support contributed by Motonori Shindo (mshindo@mshindo.net)
22 */
23
24 #ifndef lint
25 static const char rcsid[] =
26 "@(#) $Header: /tcpdump/master/tcpdump/print-l2tp.c,v 1.10 2001-11-10 21:37:58 guy Exp $";
27 #endif
28
29 #ifdef HAVE_CONFIG_H
30 #include "config.h"
31 #endif
32
33 #include <stdio.h>
34 #include <sys/types.h>
35 #include <sys/param.h>
36 #include <netinet/in.h>
37 #include <arpa/inet.h>
38
39 #include "l2tp.h"
40 #include "interface.h"
41
42 static char tstr[] = " [|l2tp]";
43
44 #ifndef TRUE
45 #define TRUE 1
46 #endif
47
48 #ifndef FALSE
49 #define FALSE 0
50 #endif
51
52 #define L2TP_MSGTYPE_SCCRQ 1 /* Start-Control-Connection-Request */
53 #define L2TP_MSGTYPE_SCCRP 2 /* Start-Control-Connection-Reply */
54 #define L2TP_MSGTYPE_SCCCN 3 /* Start-Control-Connection-Connected */
55 #define L2TP_MSGTYPE_STOPCCN 4 /* Stop-Control-Connection-Notification */
56 #define L2TP_MSGTYPE_HELLO 6 /* Hello */
57 #define L2TP_MSGTYPE_OCRQ 7 /* Outgoing-Call-Request */
58 #define L2TP_MSGTYPE_OCRP 8 /* Outgoing-Call-Reply */
59 #define L2TP_MSGTYPE_OCCN 9 /* Outgoing-Call-Connected */
60 #define L2TP_MSGTYPE_ICRQ 10 /* Incoming-Call-Request */
61 #define L2TP_MSGTYPE_ICRP 11 /* Incoming-Call-Reply */
62 #define L2TP_MSGTYPE_ICCN 12 /* Incoming-Call-Connected */
63 #define L2TP_MSGTYPE_CDN 14 /* Call-Disconnect-Notify */
64 #define L2TP_MSGTYPE_WEN 15 /* WAN-Error-Notify */
65 #define L2TP_MSGTYPE_SLI 16 /* Set-Link-Info */
66
67 static struct tok l2tp_msgtype2str[] = {
68 { L2TP_MSGTYPE_SCCRQ, "SCCRQ" },
69 { L2TP_MSGTYPE_SCCRP, "SCCRP" },
70 { L2TP_MSGTYPE_SCCCN, "SCCCN" },
71 { L2TP_MSGTYPE_STOPCCN, "StopCCN" },
72 { L2TP_MSGTYPE_HELLO, "HELLO" },
73 { L2TP_MSGTYPE_OCRQ, "OCRQ" },
74 { L2TP_MSGTYPE_OCRP, "OCRP" },
75 { L2TP_MSGTYPE_OCCN, "OCCN" },
76 { L2TP_MSGTYPE_ICRQ, "ICRQ" },
77 { L2TP_MSGTYPE_ICRP, "ICRP" },
78 { L2TP_MSGTYPE_ICCN, "ICCN" },
79 { L2TP_MSGTYPE_CDN, "CDN" },
80 { L2TP_MSGTYPE_WEN, "WEN" },
81 { L2TP_MSGTYPE_SLI, "SLI" },
82 { 0, NULL }
83 };
84
85 #define L2TP_AVP_MSGTYPE 0 /* Message Type */
86 #define L2TP_AVP_RESULT_CODE 1 /* Result Code */
87 #define L2TP_AVP_PROTO_VER 2 /* Protocol Version */
88 #define L2TP_AVP_FRAMING_CAP 3 /* Framing Capabilities */
89 #define L2TP_AVP_BEARER_CAP 4 /* Bearer Capabilities */
90 #define L2TP_AVP_TIE_BREAKER 5 /* Tie Breaker */
91 #define L2TP_AVP_FIRM_VER 6 /* Firmware Revision */
92 #define L2TP_AVP_HOST_NAME 7 /* Host Name */
93 #define L2TP_AVP_VENDOR_NAME 8 /* Vendor Name */
94 #define L2TP_AVP_ASSND_TUN_ID 9 /* Assigned Tunnel ID */
95 #define L2TP_AVP_RECV_WIN_SIZE 10 /* Receive Window Size */
96 #define L2TP_AVP_CHALLENGE 11 /* Challenge */
97 #define L2TP_AVP_Q931_CC 12 /* Q.931 Cause Code */
98 #define L2TP_AVP_CHALLENGE_RESP 13 /* Challenge Response */
99 #define L2TP_AVP_ASSND_SESS_ID 14 /* Assigned Session ID */
100 #define L2TP_AVP_CALL_SER_NUM 15 /* Call Serial Number */
101 #define L2TP_AVP_MINIMUM_BPS 16 /* Minimum BPS */
102 #define L2TP_AVP_MAXIMUM_BPS 17 /* Maximum BPS */
103 #define L2TP_AVP_BEARER_TYPE 18 /* Bearer Type */
104 #define L2TP_AVP_FRAMING_TYPE 19 /* Framing Type */
105 #define L2TP_AVP_PACKET_PROC_DELAY 20 /* Packet Processing Delay (OBSOLETE) */
106 #define L2TP_AVP_CALLED_NUMBER 21 /* Called Number */
107 #define L2TP_AVP_CALLING_NUMBER 22 /* Calling Number */
108 #define L2TP_AVP_SUB_ADDRESS 23 /* Sub-Address */
109 #define L2TP_AVP_TX_CONN_SPEED 24 /* (Tx) Connect Speed */
110 #define L2TP_AVP_PHY_CHANNEL_ID 25 /* Physical Channel ID */
111 #define L2TP_AVP_INI_RECV_LCP 26 /* Initial Received LCP CONFREQ */
112 #define L2TP_AVP_LAST_SENT_LCP 27 /* Last Sent LCP CONFREQ */
113 #define L2TP_AVP_LAST_RECV_LCP 28 /* Last Received LCP CONFREQ */
114 #define L2TP_AVP_PROXY_AUTH_TYPE 29 /* Proxy Authen Type */
115 #define L2TP_AVP_PROXY_AUTH_NAME 30 /* Proxy Authen Name */
116 #define L2TP_AVP_PROXY_AUTH_CHAL 31 /* Proxy Authen Challenge */
117 #define L2TP_AVP_PROXY_AUTH_ID 32 /* Proxy Authen ID */
118 #define L2TP_AVP_PROXY_AUTH_RESP 33 /* Proxy Authen Response */
119 #define L2TP_AVP_CALL_ERRORS 34 /* Call Errors */
120 #define L2TP_AVP_ACCM 35 /* ACCM */
121 #define L2TP_AVP_RANDOM_VECTOR 36 /* Random Vector */
122 #define L2TP_AVP_PRIVATE_GRP_ID 37 /* Private Group ID */
123 #define L2TP_AVP_RX_CONN_SPEED 38 /* (Rx) Connect Speed */
124 #define L2TP_AVP_SEQ_REQUIRED 39 /* Sequencing Required */
125 #define L2TP_AVP_PPP_DISCON_CC 46 /* PPP Disconnect Cause Code */
126
127 static struct tok l2tp_avp2str[] = {
128 { L2TP_AVP_MSGTYPE, "MSGTYPE" },
129 { L2TP_AVP_RESULT_CODE, "RESULT_CODE" },
130 { L2TP_AVP_PROTO_VER, "PROTO_VER" },
131 { L2TP_AVP_FRAMING_CAP, "FRAMING_CAP" },
132 { L2TP_AVP_BEARER_CAP, "BEARER_CAP" },
133 { L2TP_AVP_TIE_BREAKER, "TIE_BREAKER" },
134 { L2TP_AVP_FIRM_VER, "FIRM_VER" },
135 { L2TP_AVP_HOST_NAME, "HOST_NAME" },
136 { L2TP_AVP_VENDOR_NAME, "VENDOR_NAME" },
137 { L2TP_AVP_ASSND_TUN_ID, "ASSND_TUN_ID" },
138 { L2TP_AVP_RECV_WIN_SIZE, "RECV_WIN_SIZE" },
139 { L2TP_AVP_CHALLENGE, "CHALLENGE" },
140 { L2TP_AVP_Q931_CC, "Q931_CC", },
141 { L2TP_AVP_CHALLENGE_RESP, "CHALLENGE_RESP" },
142 { L2TP_AVP_ASSND_SESS_ID, "ASSND_SESS_ID" },
143 { L2TP_AVP_CALL_SER_NUM, "CALL_SER_NUM" },
144 { L2TP_AVP_MINIMUM_BPS, "MINIMUM_BPS" },
145 { L2TP_AVP_MAXIMUM_BPS, "MAXIMUM_BPS" },
146 { L2TP_AVP_BEARER_TYPE, "BEARER_TYPE" },
147 { L2TP_AVP_FRAMING_TYPE, "FRAMING_TYPE" },
148 { L2TP_AVP_PACKET_PROC_DELAY, "PACKET_PROC_DELAY" },
149 { L2TP_AVP_CALLED_NUMBER, "CALLED_NUMBER" },
150 { L2TP_AVP_CALLING_NUMBER, "CALLING_NUMBER" },
151 { L2TP_AVP_SUB_ADDRESS, "SUB_ADDRESS" },
152 { L2TP_AVP_TX_CONN_SPEED, "TX_CONN_SPEED" },
153 { L2TP_AVP_PHY_CHANNEL_ID, "PHY_CHANNEL_ID" },
154 { L2TP_AVP_INI_RECV_LCP, "INI_RECV_LCP" },
155 { L2TP_AVP_LAST_SENT_LCP, "LAST_SENT_LCP" },
156 { L2TP_AVP_LAST_RECV_LCP, "LAST_RECV_LCP" },
157 { L2TP_AVP_PROXY_AUTH_TYPE, "PROXY_AUTH_TYPE" },
158 { L2TP_AVP_PROXY_AUTH_NAME, "PROXY_AUTH_NAME" },
159 { L2TP_AVP_PROXY_AUTH_CHAL, "PROXY_AUTH_CHAL" },
160 { L2TP_AVP_PROXY_AUTH_ID, "PROXY_AUTH_ID" },
161 { L2TP_AVP_PROXY_AUTH_RESP, "PROXY_AUTH_RESP" },
162 { L2TP_AVP_CALL_ERRORS, "CALL_ERRORS" },
163 { L2TP_AVP_ACCM, "ACCM" },
164 { L2TP_AVP_RANDOM_VECTOR, "RANDOM_VECTOR" },
165 { L2TP_AVP_PRIVATE_GRP_ID, "PRIVATE_GRP_ID" },
166 { L2TP_AVP_RX_CONN_SPEED, "RX_CONN_SPEED" },
167 { L2TP_AVP_SEQ_REQUIRED, "SEQ_REQUIRED" },
168 { L2TP_AVP_PPP_DISCON_CC, "PPP_DISCON_CC" },
169 { 0, NULL }
170 };
171
172 static struct tok l2tp_authentype2str[] = {
173 { L2TP_AUTHEN_TYPE_RESERVED, "Reserved" },
174 { L2TP_AUTHEN_TYPE_TEXTUAL, "Textual" },
175 { L2TP_AUTHEN_TYPE_CHAP, "CHAP" },
176 { L2TP_AUTHEN_TYPE_PAP, "PAP" },
177 { L2TP_AUTHEN_TYPE_NO_AUTH, "No Auth" },
178 { L2TP_AUTHEN_TYPE_MSCHAPv1, "MS-CHAPv1" },
179 { 0, NULL }
180 };
181
182 #define L2TP_PPP_DISCON_CC_DIRECTION_GLOBAL 0
183 #define L2TP_PPP_DISCON_CC_DIRECTION_AT_PEER 1
184 #define L2TP_PPP_DISCON_CC_DIRECTION_AT_LOCAL 2
185
186 static struct tok l2tp_cc_direction2str[] = {
187 { L2TP_PPP_DISCON_CC_DIRECTION_GLOBAL, "global error" },
188 { L2TP_PPP_DISCON_CC_DIRECTION_AT_PEER, "at peer" },
189 { L2TP_PPP_DISCON_CC_DIRECTION_AT_LOCAL,"at local" },
190 { 0, NULL }
191 };
192
193 #if 0
194 static char *l2tp_result_code_StopCCN[] = {
195 "Reserved",
196 "General request to clear control connection",
197 "General error--Error Code indicates the problem",
198 "Control channel already exists",
199 "Requester is not authorized to establish a control channel",
200 "The protocol version of the requester is not supported",
201 "Requester is being shut down",
202 "Finite State Machine error"
203 #define L2TP_MAX_RESULT_CODE_STOPCC_INDEX 8
204 };
205 #endif
206
207 #if 0
208 static char *l2tp_result_code_CDN[] = {
209 "Reserved",
210 "Call disconnected due to loss of carrier",
211 "Call disconnected for the reason indicated in error code",
212 "Call disconnected for administrative reasons",
213 "Call failed due to lack of appropriate facilities being " \
214 "available (temporary condition)",
215 "Call failed due to lack of appropriate facilities being " \
216 "available (permanent condition)",
217 "Invalid destination",
218 "Call failed due to no carrier detected",
219 "Call failed due to detection of a busy signal",
220 "Call failed due to lack of a dial tone",
221 "Call was not established within time allotted by LAC",
222 "Call was connected but no appropriate framing was detected"
223 #define L2TP_MAX_RESULT_CODE_CDN_INDEX 12
224 };
225 #endif
226
227 #if 0
228 static char *l2tp_error_code_general[] = {
229 "No general error",
230 "No control connection exists yet for this LAC-LNS pair",
231 "Length is wrong",
232 "One of the field values was out of range or " \
233 "reserved field was non-zero"
234 "Insufficient resources to handle this operation now",
235 "The Session ID is invalid in this context",
236 "A generic vendor-specific error occurred in the LAC",
237 "Try another"
238 #define L2TP_MAX_ERROR_CODE_GENERAL_INDEX 8
239 };
240 #endif
241
242 /******************************/
243 /* generic print out routines */
244 /******************************/
245 static void
246 print_string(const u_char *dat, u_int length)
247 {
248 int i;
249 for (i=0; i<length; i++) {
250 printf("%c", *dat++);
251 }
252 }
253
254 static void
255 print_octets(const u_char *dat, u_int length)
256 {
257 int i;
258 for (i=0; i<length; i++) {
259 printf("%02x", *dat++);
260 }
261 }
262
263 static void
264 print_16bits_val(const u_int16_t *dat)
265 {
266 printf("%u", ntohs(*dat));
267 }
268
269 static void
270 print_32bits_val(const u_int32_t *dat)
271 {
272 printf("%lu", (u_long)ntohl(*dat));
273 }
274
275 /***********************************/
276 /* AVP-specific print out routines */
277 /***********************************/
278 static void
279 l2tp_msgtype_print(const u_char *dat)
280 {
281 u_int16_t *ptr = (u_int16_t*)dat;
282
283 printf("%s", tok2str(l2tp_msgtype2str, "MSGTYPE-#%u", ntohs(*ptr)));
284 }
285
286 static void
287 l2tp_result_code_print(const u_char *dat, u_int length)
288 {
289 u_int16_t *ptr = (u_int16_t *)dat;
290
291 printf("%u", ntohs(*ptr++)); /* Result Code */
292 if (length > 2) { /* Error Code (opt) */
293 printf("/%u", ntohs(*ptr++));
294 }
295 if (length > 4) { /* Error Message (opt) */
296 printf(" ");
297 print_string((u_char *)ptr, length - 4);
298 }
299 }
300
301 static void
302 l2tp_proto_ver_print(const u_int16_t *dat)
303 {
304 printf("%u.%u", (ntohs(*dat) >> 8), (ntohs(*dat) & 0xff));
305 }
306
307 static void
308 l2tp_framing_cap_print(const u_char *dat)
309 {
310 u_int32_t *ptr = (u_int32_t *)dat;
311
312 if (ntohl(*ptr) & L2TP_FRAMING_CAP_ASYNC_MASK) {
313 printf("A");
314 }
315 if (ntohl(*ptr) & L2TP_FRAMING_CAP_SYNC_MASK) {
316 printf("S");
317 }
318 }
319
320 static void
321 l2tp_bearer_cap_print(const u_char *dat)
322 {
323 u_int32_t *ptr = (u_int32_t *)dat;
324
325 if (ntohl(*ptr) & L2TP_BEARER_CAP_ANALOG_MASK) {
326 printf("A");
327 }
328 if (ntohl(*ptr) & L2TP_BEARER_CAP_DIGITAL_MASK) {
329 printf("D");
330 }
331 }
332
333 static void
334 l2tp_q931_cc_print(const u_char *dat, u_int length)
335 {
336 print_16bits_val((u_int16_t *)dat);
337 printf(", %02x", dat[2]);
338 if (length > 3) {
339 printf(" ");
340 print_string(dat+3, length-3);
341 }
342 }
343
344 static void
345 l2tp_bearer_type_print(const u_char *dat)
346 {
347 u_int32_t *ptr = (u_int32_t *)dat;
348
349 if (ntohl(*ptr) & L2TP_BEARER_TYPE_ANALOG_MASK) {
350 printf("A");
351 }
352 if (ntohl(*ptr) & L2TP_BEARER_TYPE_DIGITAL_MASK) {
353 printf("D");
354 }
355 }
356
357 static void
358 l2tp_framing_type_print(const u_char *dat)
359 {
360 u_int32_t *ptr = (u_int32_t *)dat;
361
362 if (ntohl(*ptr) & L2TP_FRAMING_TYPE_ASYNC_MASK) {
363 printf("A");
364 }
365 if (ntohl(*ptr) & L2TP_FRAMING_TYPE_SYNC_MASK) {
366 printf("S");
367 }
368 }
369
370 static void
371 l2tp_packet_proc_delay_print(void)
372 {
373 printf("obsolete");
374 }
375
376 static void
377 l2tp_proxy_auth_type_print(const u_char *dat)
378 {
379 u_int16_t *ptr = (u_int16_t *)dat;
380
381 printf("%s", tok2str(l2tp_authentype2str,
382 "AuthType-#%u", ntohs(*ptr)));
383 }
384
385 static void
386 l2tp_proxy_auth_id_print(const u_char *dat)
387 {
388 u_int16_t *ptr = (u_int16_t *)dat;
389
390 printf("%u", ntohs(*ptr) & L2TP_PROXY_AUTH_ID_MASK);
391 }
392
393 static void
394 l2tp_call_errors_print(const u_char *dat)
395 {
396 u_int16_t *ptr = (u_int16_t *)dat;
397 u_int16_t val_h, val_l;
398
399 ptr++; /* skip "Reserved" */
400
401 val_h = ntohs(*ptr++);
402 val_l = ntohs(*ptr++);
403 printf("CRCErr=%u ", (val_h<<16) + val_l);
404
405 val_h = ntohs(*ptr++);
406 val_l = ntohs(*ptr++);
407 printf("FrameErr=%u ", (val_h<<16) + val_l);
408
409 val_h = ntohs(*ptr++);
410 val_l = ntohs(*ptr++);
411 printf("HardOver=%u ", (val_h<<16) + val_l);
412
413 val_h = ntohs(*ptr++);
414 val_l = ntohs(*ptr++);
415 printf("BufOver=%u ", (val_h<<16) + val_l);
416
417 val_h = ntohs(*ptr++);
418 val_l = ntohs(*ptr++);
419 printf("Timeout=%u ", (val_h<<16) + val_l);
420
421 val_h = ntohs(*ptr++);
422 val_l = ntohs(*ptr++);
423 printf("AlignErr=%u ", (val_h<<16) + val_l);
424 }
425
426 static void
427 l2tp_accm_print(const u_char *dat)
428 {
429 u_int16_t *ptr = (u_int16_t *)dat;
430 u_int16_t val_h, val_l;
431
432 ptr++; /* skip "Reserved" */
433
434 val_h = ntohs(*ptr++);
435 val_l = ntohs(*ptr++);
436 printf("send=%08x ", (val_h<<16) + val_l);
437
438 val_h = ntohs(*ptr++);
439 val_l = ntohs(*ptr++);
440 printf("recv=%08x ", (val_h<<16) + val_l);
441 }
442
443 static void
444 l2tp_ppp_discon_cc_print(const u_char *dat, u_int length)
445 {
446 u_int16_t *ptr = (u_int16_t *)dat;
447
448 printf("%04x, ", ntohs(*ptr++)); /* Disconnect Code */
449 printf("%04x ", ntohs(*ptr++)); /* Control Protocol Number */
450 printf("%s", tok2str(l2tp_cc_direction2str,
451 "Direction-#%u", *((u_char *)ptr++)));
452
453 if (length > 5) {
454 printf(" ");
455 print_string((const u_char *)ptr, length-5);
456 }
457 }
458
459 static void
460 l2tp_avp_print(const u_char *dat, int length)
461 {
462 u_int len;
463 const u_int16_t *ptr = (u_int16_t *)dat;
464 u_int16_t attr_type;
465 int hidden = FALSE;
466
467 if (length <= 0) {
468 return;
469 }
470
471 printf(" ");
472
473 TCHECK(*ptr); /* Flags & Length */
474 len = ntohs(*ptr) & L2TP_AVP_HDR_LEN_MASK;
475
476 /* If it is not long enough to decode the entire AVP, we'll
477 abandon. */
478 TCHECK2(*ptr, len);
479 /* After this point, no need to worry about truncation */
480
481 if (ntohs(*ptr) & L2TP_AVP_HDR_FLAG_MANDATORY) {
482 printf("*");
483 }
484 if (ntohs(*ptr) & L2TP_AVP_HDR_FLAG_HIDDEN) {
485 hidden = TRUE;
486 printf("?");
487 }
488 ptr++;
489
490 if (ntohs(*ptr)) {
491 /* Vendor Specific Attribute */
492 printf("VENDOR%04x:", ntohs(*ptr++));
493 printf("ATTR%04x", ntohs(*ptr++));
494 printf("(");
495 print_octets((u_char *)ptr, len-6);
496 printf(")");
497 } else {
498 /* IETF-defined Attributes */
499 ptr++;
500 attr_type = ntohs(*ptr++);
501 printf("%s", tok2str(l2tp_avp2str, "AVP-#%u", attr_type));
502 printf("(");
503 if (hidden) {
504 printf("???");
505 } else {
506 switch (attr_type) {
507 case L2TP_AVP_MSGTYPE:
508 l2tp_msgtype_print((u_char *)ptr);
509 break;
510 case L2TP_AVP_RESULT_CODE:
511 l2tp_result_code_print((u_char *)ptr, len-6);
512 break;
513 case L2TP_AVP_PROTO_VER:
514 l2tp_proto_ver_print(ptr);
515 break;
516 case L2TP_AVP_FRAMING_CAP:
517 l2tp_framing_cap_print((u_char *)ptr);
518 break;
519 case L2TP_AVP_BEARER_CAP:
520 l2tp_bearer_cap_print((u_char *)ptr);
521 break;
522 case L2TP_AVP_TIE_BREAKER:
523 print_octets((u_char *)ptr, 8);
524 break;
525 case L2TP_AVP_FIRM_VER:
526 case L2TP_AVP_ASSND_TUN_ID:
527 case L2TP_AVP_RECV_WIN_SIZE:
528 case L2TP_AVP_ASSND_SESS_ID:
529 print_16bits_val(ptr);
530 break;
531 case L2TP_AVP_HOST_NAME:
532 case L2TP_AVP_VENDOR_NAME:
533 case L2TP_AVP_CALLING_NUMBER:
534 case L2TP_AVP_CALLED_NUMBER:
535 case L2TP_AVP_SUB_ADDRESS:
536 case L2TP_AVP_PROXY_AUTH_NAME:
537 case L2TP_AVP_PRIVATE_GRP_ID:
538 print_string((u_char *)ptr, len-6);
539 break;
540 case L2TP_AVP_CHALLENGE:
541 case L2TP_AVP_INI_RECV_LCP:
542 case L2TP_AVP_LAST_SENT_LCP:
543 case L2TP_AVP_LAST_RECV_LCP:
544 case L2TP_AVP_PROXY_AUTH_CHAL:
545 case L2TP_AVP_PROXY_AUTH_RESP:
546 case L2TP_AVP_RANDOM_VECTOR:
547 print_octets((u_char *)ptr, len-6);
548 break;
549 case L2TP_AVP_Q931_CC:
550 l2tp_q931_cc_print((u_char *)ptr, len-6);
551 break;
552 case L2TP_AVP_CHALLENGE_RESP:
553 print_octets((u_char *)ptr, 16);
554 break;
555 case L2TP_AVP_CALL_SER_NUM:
556 case L2TP_AVP_MINIMUM_BPS:
557 case L2TP_AVP_MAXIMUM_BPS:
558 case L2TP_AVP_TX_CONN_SPEED:
559 case L2TP_AVP_PHY_CHANNEL_ID:
560 case L2TP_AVP_RX_CONN_SPEED:
561 print_32bits_val((u_int32_t *)ptr);
562 break;
563 case L2TP_AVP_BEARER_TYPE:
564 l2tp_bearer_type_print((u_char *)ptr);
565 break;
566 case L2TP_AVP_FRAMING_TYPE:
567 l2tp_framing_type_print((u_char *)ptr);
568 break;
569 case L2TP_AVP_PACKET_PROC_DELAY:
570 l2tp_packet_proc_delay_print();
571 break;
572 case L2TP_AVP_PROXY_AUTH_TYPE:
573 l2tp_proxy_auth_type_print((u_char *)ptr);
574 break;
575 case L2TP_AVP_PROXY_AUTH_ID:
576 l2tp_proxy_auth_id_print((u_char *)ptr);
577 break;
578 case L2TP_AVP_CALL_ERRORS:
579 l2tp_call_errors_print((u_char *)ptr);
580 break;
581 case L2TP_AVP_ACCM:
582 l2tp_accm_print((u_char *)ptr);
583 break;
584 case L2TP_AVP_SEQ_REQUIRED:
585 break; /* No Attribute Value */
586 case L2TP_AVP_PPP_DISCON_CC:
587 l2tp_ppp_discon_cc_print((u_char *)ptr, len-6);
588 break;
589 default:
590 break;
591 }
592 }
593 printf(")");
594 }
595
596 l2tp_avp_print(dat+len, length-len);
597 return;
598
599 trunc:
600 printf("|...");
601 }
602
603
604 void
605 l2tp_print(const u_char *dat, u_int length)
606 {
607 const u_int16_t *ptr = (u_int16_t *)dat;
608 u_int cnt = 0; /* total octets consumed */
609 u_int16_t pad;
610 int flag_t, flag_l, flag_s, flag_o, flag_p;
611 u_int16_t l2tp_len;
612
613 flag_t = flag_l = flag_s = flag_o = flag_p = FALSE;
614
615 TCHECK(*ptr); /* Flags & Version */
616 if ((ntohs(*ptr) & L2TP_VERSION_MASK) == L2TP_VERSION_L2TP) {
617 printf(" l2tp:");
618 } else if ((ntohs(*ptr) & L2TP_VERSION_MASK) == L2TP_VERSION_L2F) {
619 printf(" l2f:");
620 return; /* nothing to do */
621 } else {
622 printf(" Unknown Version, neither L2F(1) nor L2TP(2)");
623 return; /* nothing we can do */
624 }
625
626 printf("[");
627 if (ntohs(*ptr) & L2TP_FLAG_TYPE) {
628 flag_t = TRUE;
629 printf("T");
630 }
631 if (ntohs(*ptr) & L2TP_FLAG_LENGTH) {
632 flag_l = TRUE;
633 printf("L");
634 }
635 if (ntohs(*ptr) & L2TP_FLAG_SEQUENCE) {
636 flag_s = TRUE;
637 printf("S");
638 }
639 if (ntohs(*ptr) & L2TP_FLAG_OFFSET) {
640 flag_o = TRUE;
641 printf("O");
642 }
643 if (ntohs(*ptr) & L2TP_FLAG_PRIORITY) {
644 flag_p = TRUE;
645 printf("P");
646 }
647 printf("]");
648
649 ptr++;
650 cnt += 2;
651
652 if (flag_l) {
653 TCHECK(*ptr); /* Length */
654 l2tp_len = ntohs(*ptr++);
655 cnt += 2;
656 } else {
657 l2tp_len = 0;
658 }
659
660 TCHECK(*ptr); /* Tunnel ID */
661 printf("(%u/", ntohs(*ptr++));
662 cnt += 2;
663 TCHECK(*ptr); /* Session ID */
664 printf("%u)", ntohs(*ptr++));
665 cnt += 2;
666
667 if (flag_s) {
668 TCHECK(*ptr); /* Ns */
669 printf("Ns=%u,", ntohs(*ptr++));
670 cnt += 2;
671 TCHECK(*ptr); /* Nr */
672 printf("Nr=%u", ntohs(*ptr++));
673 cnt += 2;
674 }
675
676 if (flag_o) {
677 TCHECK(*ptr); /* Offset Size */
678 pad = ntohs(*ptr++);
679 ptr += pad / sizeof(*ptr);
680 cnt += (2 + pad);
681 }
682
683 if (flag_t) {
684 if (length - cnt == 0) {
685 printf(" ZLB");
686 } else {
687 l2tp_avp_print((u_char *)ptr, length - cnt);
688 }
689 } else {
690 printf(" {");
691 ppp_print((u_char *)ptr, length - cnt);
692 printf("}");
693 }
694
695 return;
696
697 trunc:
698 printf("%s", tstr);
699 }
[mirror] the TCPdump network dissector