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add support for MFR FRF.16 IE Message printing, add boundary checks
[tcpdump] / print-fr.c
1 /*
2 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996
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
22 #ifndef lint
23 static const char rcsid[] _U_ =
24 "@(#)$Header: /tcpdump/master/tcpdump/print-fr.c,v 1.39 2005-07-21 08:26:45 hannes Exp $ (LBL)";
25 #endif
26
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #include <tcpdump-stdinc.h>
32
33 #include <stdio.h>
34 #include <string.h>
35 #include <pcap.h>
36
37 #include "addrtoname.h"
38 #include "interface.h"
39 #include "ethertype.h"
40 #include "nlpid.h"
41 #include "extract.h"
42 #include "oui.h"
43
44 static void frf15_print(const u_char *, u_int);
45
46 /*
47 * the frame relay header has a variable length
48 *
49 * the EA bit determines if there is another byte
50 * in the header
51 *
52 * minimum header length is 2 bytes
53 * maximum header length is 4 bytes
54 *
55 * 7 6 5 4 3 2 1 0
56 * +----+----+----+----+----+----+----+----+
57 * | DLCI (6 bits) | CR | EA |
58 * +----+----+----+----+----+----+----+----+
59 * | DLCI (4 bits) |FECN|BECN| DE | EA |
60 * +----+----+----+----+----+----+----+----+
61 * | DLCI (7 bits) | EA |
62 * +----+----+----+----+----+----+----+----+
63 * | DLCI (6 bits) |SDLC| EA |
64 * +----+----+----+----+----+----+----+----+
65 */
66
67 #define FR_EA_BIT 0x01
68
69 #define FR_CR_BIT 0x02000000
70 #define FR_DE_BIT 0x00020000
71 #define FR_BECN_BIT 0x00040000
72 #define FR_FECN_BIT 0x00080000
73 #define FR_SDLC_BIT 0x00000002
74
75
76 struct tok fr_header_flag_values[] = {
77 { FR_CR_BIT, "C!" },
78 { FR_DE_BIT, "DE" },
79 { FR_BECN_BIT, "BECN" },
80 { FR_FECN_BIT, "FECN" },
81 { FR_SDLC_BIT, "sdlcore" },
82 { 0, NULL }
83 };
84
85
86 /* Finds out Q.922 address length, DLCI and flags. Returns 0 on success
87 * save the flags dep. on address length
88 */
89 static int parse_q922_addr(const u_char *p, u_int *dlci, u_int *sdlcore,
90 u_int *addr_len, u_int8_t *flags)
91 {
92 if ((p[0] & FR_EA_BIT))
93 return -1;
94
95 *addr_len = 2;
96 *dlci = ((p[0] & 0xFC) << 2) | ((p[1] & 0xF0) >> 4);
97
98 flags[0] = p[0] & 0x02; /* populate the first flag fields */
99 flags[1] = p[1] & 0x0c;
100
101 if (p[1] & FR_EA_BIT)
102 return 0; /* 2-byte Q.922 address */
103
104 p += 2;
105 (*addr_len)++; /* 3- or 4-byte Q.922 address */
106 if ((p[0] & FR_EA_BIT) == 0) {
107 *dlci = (*dlci << 7) | (p[0] >> 1);
108 (*addr_len)++; /* 4-byte Q.922 address */
109 p++;
110 }
111
112 if ((p[0] & FR_EA_BIT) == 0)
113 return -1; /* more than 4 bytes of Q.922 address? */
114
115 flags[3] = p[0] & 0x02;
116
117 if (p[0] & 0x02)
118 *sdlcore = p[0] >> 2;
119 else
120 *dlci = (*dlci << 6) | (p[0] >> 2);
121
122 return 0;
123 }
124
125 /* Frame Relay packet structure, with flags and CRC removed
126
127 +---------------------------+
128 | Q.922 Address* |
129 +-- --+
130 | |
131 +---------------------------+
132 | Control (UI = 0x03) |
133 +---------------------------+
134 | Optional Pad (0x00) |
135 +---------------------------+
136 | NLPID |
137 +---------------------------+
138 | . |
139 | . |
140 | . |
141 | Data |
142 | . |
143 | . |
144 +---------------------------+
145
146 * Q.922 addresses, as presently defined, are two octets and
147 contain a 10-bit DLCI. In some networks Q.922 addresses
148 may optionally be increased to three or four octets.
149 */
150
151 static u_int
152 fr_hdrlen(const u_char *p, u_int addr_len)
153 {
154 if (!p[addr_len + 1] /* pad exist */)
155 return addr_len + 1 /* UI */ + 1 /* pad */ + 1 /* NLPID */;
156 else
157 return addr_len + 1 /* UI */ + 1 /* NLPID */;
158 }
159
160 static void
161 fr_hdr_print(int length, u_int addr_len, u_int dlci, u_int8_t *flags, u_int16_t nlpid)
162 {
163 if (qflag) {
164 (void)printf("Q.922, DLCI %u, length %u: ",
165 dlci,
166 length);
167 } else {
168 if (nlpid <= 0xff) /* if its smaller than 256 then its a NLPID */
169 (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], NLPID %s (0x%02x), length %u: ",
170 addr_len,
171 dlci,
172 bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
173 tok2str(nlpid_values,"unknown", nlpid),
174 nlpid,
175 length);
176 else /* must be an ethertype */
177 (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], cisco-ethertype %s (0x%04x), length %u: ",
178 addr_len,
179 dlci,
180 bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
181 tok2str(ethertype_values, "unknown", nlpid),
182 nlpid,
183 length);
184 }
185 }
186
187 u_int
188 fr_if_print(const struct pcap_pkthdr *h, register const u_char *p)
189 {
190 register u_int length = h->len;
191 register u_int caplen = h->caplen;
192
193 TCHECK2(*p, 4); /* minimum frame header length */
194
195 if ((length = fr_print(p, length)) == 0)
196 return (0);
197 else
198 return length;
199 trunc:
200 printf("[|fr]");
201 return caplen;
202 }
203
204 u_int
205 fr_print(register const u_char *p, u_int length)
206 {
207 u_int16_t extracted_ethertype;
208 u_int dlci;
209 u_int sdlcore;
210 u_int addr_len;
211 u_int16_t nlpid;
212 u_int hdr_len;
213 u_int8_t flags[4];
214
215 if (parse_q922_addr(p, &dlci, &sdlcore, &addr_len, flags)) {
216 printf("Q.922, invalid address");
217 return 0;
218 }
219
220 TCHECK2(*p,addr_len+1+1);
221 hdr_len = fr_hdrlen(p, addr_len);
222 TCHECK2(*p,hdr_len);
223
224 if (p[addr_len] != 0x03 && dlci != 0) {
225
226 /* lets figure out if we have cisco style encapsulation: */
227 extracted_ethertype = EXTRACT_16BITS(p+addr_len);
228
229 if (eflag)
230 fr_hdr_print(length, addr_len, dlci, flags, extracted_ethertype);
231
232 if (ether_encap_print(extracted_ethertype,
233 p+addr_len+ETHERTYPE_LEN,
234 length-addr_len-ETHERTYPE_LEN,
235 length-addr_len-ETHERTYPE_LEN,
236 &extracted_ethertype) == 0)
237 /* ether_type not known, probably it wasn't one */
238 printf("UI %02x! ", p[addr_len]);
239 else
240 return hdr_len;
241 }
242
243 if (!p[addr_len + 1]) { /* pad byte should be used with 3-byte Q.922 */
244 if (addr_len != 3)
245 printf("Pad! ");
246 } else if (addr_len == 3)
247 printf("No pad! ");
248
249 nlpid = p[hdr_len - 1];
250
251 if (eflag)
252 fr_hdr_print(length, addr_len, dlci, flags, nlpid);
253
254 p += hdr_len;
255 length -= hdr_len;
256
257 switch (nlpid) {
258 case NLPID_IP:
259 ip_print(gndo, p, length);
260 break;
261
262 #ifdef INET6
263 case NLPID_IP6:
264 ip6_print(p, length);
265 break;
266 #endif
267 case NLPID_CLNP:
268 case NLPID_ESIS:
269 case NLPID_ISIS:
270 isoclns_print(p-1, length+1, length+1); /* OSI printers need the NLPID field */
271 break;
272
273 case NLPID_SNAP:
274 if (snap_print(p, length, length, &extracted_ethertype, 0) == 0) {
275 /* ether_type not known, print raw packet */
276 if (!eflag)
277 fr_hdr_print(length + hdr_len, hdr_len,
278 dlci, flags, nlpid);
279 if (!suppress_default_print)
280 default_print(p - hdr_len, length + hdr_len);
281 }
282 break;
283
284 case NLPID_Q933:
285 q933_print(p, length);
286 break;
287
288 case NLPID_MFR:
289 frf15_print(p, length);
290 break;
291
292 default:
293 if (!eflag)
294 fr_hdr_print(length + hdr_len, addr_len,
295 dlci, flags, nlpid);
296 if (!xflag)
297 default_print(p, length);
298 }
299
300 return hdr_len;
301
302 trunc:
303 printf("[|fr]");
304 return 0;
305
306 }
307
308 #define MFR_B_BIT 0x80
309 #define MFR_E_BIT 0x40
310 #define MFR_C_BIT 0x20
311 #define MFR_BEC_MASK (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT)
312 #define MFR_CTRL_FRAME (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT)
313 #define MFR_FRAG_FRAME (MFR_B_BIT | MFR_E_BIT )
314
315 #define MFR_CTRL_MSG_ADD_LINK 1
316 #define MFR_CTRL_MSG_ADD_LINK_ACK 2
317 #define MFR_CTRL_MSG_ADD_LINK_REJ 3
318 #define MFR_CTRL_MSG_HELLO 4
319 #define MFR_CTRL_MSG_HELLO_ACK 5
320 #define MFR_CTRL_MSG_REMOVE_LINK 6
321 #define MFR_CTRL_MSG_REMOVE_LINK_ACK 7
322
323 struct tok mfr_ctrl_msg_values[] = {
324 { MFR_CTRL_MSG_ADD_LINK, "Add Link" },
325 { MFR_CTRL_MSG_ADD_LINK_ACK, "Add Link ACK" },
326 { MFR_CTRL_MSG_ADD_LINK_REJ, "Add Link Reject" },
327 { MFR_CTRL_MSG_HELLO, "Hello" },
328 { MFR_CTRL_MSG_HELLO_ACK, "Hello ACK" },
329 { MFR_CTRL_MSG_REMOVE_LINK, "Remove Link" },
330 { MFR_CTRL_MSG_REMOVE_LINK_ACK, "Remove Link ACK" },
331 { 0, NULL }
332 };
333
334 #define MFR_CTRL_IE_BUNDLE_ID 1
335 #define MFR_CTRL_IE_LINK_ID 2
336 #define MFR_CTRL_IE_MAGIC_NUM 3
337 #define MFR_CTRL_IE_TIMESTAMP 5
338 #define MFR_CTRL_IE_VENDOR_EXT 6
339 #define MFR_CTRL_IE_CAUSE 7
340
341 struct tok mfr_ctrl_ie_values[] = {
342 { MFR_CTRL_IE_BUNDLE_ID, "Bundel ID"},
343 { MFR_CTRL_IE_LINK_ID, "Link ID"},
344 { MFR_CTRL_IE_MAGIC_NUM, "Magic Number"},
345 { MFR_CTRL_IE_TIMESTAMP, "Timestamp"},
346 { MFR_CTRL_IE_VENDOR_EXT, "Vendor Extension"},
347 { MFR_CTRL_IE_CAUSE, "Cause"},
348 { 0, NULL }
349 };
350
351 #define MFR_ID_STRING_MAXLEN 50
352
353 struct ie_tlv_header_t {
354 u_int8_t ie_type;
355 u_int8_t ie_len;
356 };
357
358 u_int
359 mfr_print(register const u_char *p, u_int length)
360 {
361 u_int tlen,idx,hdr_len = 0;
362 u_int16_t sequence_num;
363 u_int8_t ie_type,ie_len;
364 const char *tptr;
365
366
367 /*
368 * FRF.16 Link Integrity Control Frame
369 *
370 * 7 6 5 4 3 2 1 0
371 * +----+----+----+----+----+----+----+----+
372 * | B | E | C=1| 0 0 0 0 | EA |
373 * +----+----+----+----+----+----+----+----+
374 * | 0 0 0 0 0 0 0 0 |
375 * +----+----+----+----+----+----+----+----+
376 * | message type |
377 * +----+----+----+----+----+----+----+----+
378 */
379
380 TCHECK2(*p, 4); /* minimum frame header length */
381
382 if ((p[0] & MFR_BEC_MASK) == MFR_CTRL_FRAME && p[1] == 0) {
383 printf("FRF.16 Control, %s, length %u",
384 tok2str(mfr_ctrl_msg_values,"Unknown Message (0x%02x)",p[2]),
385 length);
386 tptr = p + 3;
387 tlen = length -3;
388 while (tlen>sizeof(struct ie_tlv_header_t)) {
389 TCHECK2(*tptr, sizeof(struct ie_tlv_header_t));
390 ie_type=tptr[0];
391 ie_len=tptr[1];
392
393 printf("\n\tIE %s (%u), length %u: ",
394 tok2str(mfr_ctrl_ie_values,"Unknown",ie_type),
395 ie_type,
396 ie_len);
397
398 /* infinite loop check */
399 if (ie_type == 0 || ie_len <= sizeof(struct ie_tlv_header_t))
400 return hdr_len;
401
402 TCHECK2(*tptr,ie_len);
403 tptr+=sizeof(struct ie_tlv_header_t);
404 /* tlv len includes header */
405 ie_len-=sizeof(struct ie_tlv_header_t);
406 tlen-=sizeof(struct ie_tlv_header_t);
407
408 switch (ie_type) {
409
410 case MFR_CTRL_IE_MAGIC_NUM:
411 printf("0x%08x",EXTRACT_32BITS(tptr));
412 break;
413
414 case MFR_CTRL_IE_TIMESTAMP:
415 ts_print((const struct timeval *)tptr);
416 break;
417
418 case MFR_CTRL_IE_BUNDLE_ID: /* same message format */
419 case MFR_CTRL_IE_LINK_ID:
420 for (idx = 0; idx < ie_len && idx < MFR_ID_STRING_MAXLEN; idx++)
421 safeputchar(*(tptr+idx));
422 break;
423
424 /*
425 * FIXME those are the defined IEs that lack a decoder
426 * you are welcome to contribute code ;-)
427 */
428
429 case MFR_CTRL_IE_VENDOR_EXT:
430 case MFR_CTRL_IE_CAUSE:
431
432 default:
433 if (vflag >= 1)
434 print_unknown_data(tptr,"\n\t ",ie_len);
435 break;
436 }
437 tlen-=ie_len;
438 tptr+=ie_len;
439 }
440 return hdr_len;
441 }
442 /*
443 * FRF.16 Fragmentation Frame
444 *
445 * 7 6 5 4 3 2 1 0
446 * +----+----+----+----+----+----+----+----+
447 * | B | E | C=0|seq. (high 4 bits) | EA |
448 * +----+----+----+----+----+----+----+----+
449 * | sequence (low 8 bits) |
450 * +----+----+----+----+----+----+----+----+
451 * | DLCI (6 bits) | CR | EA |
452 * +----+----+----+----+----+----+----+----+
453 * | DLCI (4 bits) |FECN|BECN| DE | EA |
454 * +----+----+----+----+----+----+----+----+
455 */
456
457 if ((p[0] & MFR_BEC_MASK) == MFR_FRAG_FRAME) {
458 sequence_num = (p[0]&0x1e)<<7 | p[1];
459 if (eflag)
460 printf("FRF.16 Frag, seq %u, ", sequence_num);
461 hdr_len = 2;
462 fr_print(p+hdr_len,length-hdr_len);
463 }
464
465 return hdr_len;
466
467 trunc:
468 printf("[|mfr]");
469 return length;
470 }
471
472 /* an NLPID of 0xb1 indicates a 2-byte
473 * FRF.15 header
474 *
475 * 7 6 5 4 3 2 1 0
476 * +----+----+----+----+----+----+----+----+
477 * ~ Q.922 header ~
478 * +----+----+----+----+----+----+----+----+
479 * | NLPID (8 bits) | NLPID=0xb1
480 * +----+----+----+----+----+----+----+----+
481 * | B | E | C |seq. (high 4 bits) | R |
482 * +----+----+----+----+----+----+----+----+
483 * | sequence (low 8 bits) |
484 * +----+----+----+----+----+----+----+----+
485 */
486
487 struct tok frf15_flag_values[] = {
488 { 0x80, "Begin" },
489 { 0x40, "End" },
490 { 0x20, "Control" },
491 { 0, NULL }
492 };
493
494 #define FR_FRF15_FRAGTYPE 0x01
495
496 static void
497 frf15_print (const u_char *p, u_int length) {
498
499 u_int16_t sequence_num, flags;
500
501 flags = p[0]&0xe0;
502 sequence_num = (p[0]&0x1e)<<7 | p[1];
503
504 printf("FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u",
505 sequence_num,
506 bittok2str(frf15_flag_values,"none",flags),
507 flags&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End",
508 length);
509
510 /* TODO:
511 * depending on all permutations of the B, E and C bit
512 * dig as deep as we can - e.g. on the first (B) fragment
513 * there is enough payload to print the IP header
514 * on non (B) fragments it depends if the fragmentation
515 * model is end-to-end or interface based wether we want to print
516 * another Q.922 header
517 */
518
519 }
520
521 /*
522 * Q.933 decoding portion for framerelay specific.
523 */
524
525 /* Q.933 packet format
526 Format of Other Protocols
527 using Q.933 NLPID
528 +-------------------------------+
529 | Q.922 Address |
530 +---------------+---------------+
531 |Control 0x03 | NLPID 0x08 |
532 +---------------+---------------+
533 | L2 Protocol ID |
534 | octet 1 | octet 2 |
535 +-------------------------------+
536 | L3 Protocol ID |
537 | octet 2 | octet 2 |
538 +-------------------------------+
539 | Protocol Data |
540 +-------------------------------+
541 | FCS |
542 +-------------------------------+
543 */
544
545 /* L2 (Octet 1)- Call Reference Usually is 0x0 */
546
547 /*
548 * L2 (Octet 2)- Message Types definition 1 byte long.
549 */
550 /* Call Establish */
551 #define MSG_TYPE_ESC_TO_NATIONAL 0x00
552 #define MSG_TYPE_ALERT 0x01
553 #define MSG_TYPE_CALL_PROCEEDING 0x02
554 #define MSG_TYPE_CONNECT 0x07
555 #define MSG_TYPE_CONNECT_ACK 0x0F
556 #define MSG_TYPE_PROGRESS 0x03
557 #define MSG_TYPE_SETUP 0x05
558 /* Call Clear */
559 #define MSG_TYPE_DISCONNECT 0x45
560 #define MSG_TYPE_RELEASE 0x4D
561 #define MSG_TYPE_RELEASE_COMPLETE 0x5A
562 #define MSG_TYPE_RESTART 0x46
563 #define MSG_TYPE_RESTART_ACK 0x4E
564 /* Status */
565 #define MSG_TYPE_STATUS 0x7D
566 #define MSG_TYPE_STATUS_ENQ 0x75
567
568 struct tok fr_q933_msg_values[] = {
569 { MSG_TYPE_ESC_TO_NATIONAL, "ESC to National" },
570 { MSG_TYPE_ALERT, "Alert" },
571 { MSG_TYPE_CALL_PROCEEDING, "Call proceeding" },
572 { MSG_TYPE_CONNECT, "Connect" },
573 { MSG_TYPE_CONNECT_ACK, "Connect ACK" },
574 { MSG_TYPE_PROGRESS, "Progress" },
575 { MSG_TYPE_SETUP, "Setup" },
576 { MSG_TYPE_DISCONNECT, "Disconnect" },
577 { MSG_TYPE_RELEASE, "Release" },
578 { MSG_TYPE_RELEASE_COMPLETE, "Release Complete" },
579 { MSG_TYPE_RESTART, "Restart" },
580 { MSG_TYPE_RESTART_ACK, "Restart ACK" },
581 { MSG_TYPE_STATUS, "Status Reply" },
582 { MSG_TYPE_STATUS_ENQ, "Status Enquiry" },
583 { 0, NULL }
584 };
585
586 #define MSG_ANSI_LOCKING_SHIFT 0x95
587
588 #define FR_LMI_ANSI_REPORT_TYPE_IE 0x01
589 #define FR_LMI_ANSI_LINK_VERIFY_IE_91 0x19 /* details? */
590 #define FR_LMI_ANSI_LINK_VERIFY_IE 0x03
591 #define FR_LMI_ANSI_PVC_STATUS_IE 0x07
592
593 #define FR_LMI_CCITT_REPORT_TYPE_IE 0x51
594 #define FR_LMI_CCITT_LINK_VERIFY_IE 0x53
595 #define FR_LMI_CCITT_PVC_STATUS_IE 0x57
596
597 struct tok fr_q933_ie_values_codeset5[] = {
598 { FR_LMI_ANSI_REPORT_TYPE_IE, "ANSI Report Type" },
599 { FR_LMI_ANSI_LINK_VERIFY_IE_91, "ANSI Link Verify" },
600 { FR_LMI_ANSI_LINK_VERIFY_IE, "ANSI Link Verify" },
601 { FR_LMI_ANSI_PVC_STATUS_IE, "ANSI PVC Status" },
602 { FR_LMI_CCITT_REPORT_TYPE_IE, "CCITT Report Type" },
603 { FR_LMI_CCITT_LINK_VERIFY_IE, "CCITT Link Verify" },
604 { FR_LMI_CCITT_PVC_STATUS_IE, "CCITT PVC Status" },
605 { 0, NULL }
606 };
607
608 #define FR_LMI_REPORT_TYPE_IE_FULL_STATUS 0
609 #define FR_LMI_REPORT_TYPE_IE_LINK_VERIFY 1
610 #define FR_LMI_REPORT_TYPE_IE_ASYNC_PVC 2
611
612 struct tok fr_lmi_report_type_ie_values[] = {
613 { FR_LMI_REPORT_TYPE_IE_FULL_STATUS, "Full Status" },
614 { FR_LMI_REPORT_TYPE_IE_LINK_VERIFY, "Link verify" },
615 { FR_LMI_REPORT_TYPE_IE_ASYNC_PVC, "Async PVC Status" },
616 { 0, NULL }
617 };
618
619 /* array of 16 codepages - currently we only support codepage 5 */
620 static struct tok *fr_q933_ie_codesets[] = {
621 NULL,
622 NULL,
623 NULL,
624 NULL,
625 NULL,
626 fr_q933_ie_values_codeset5,
627 NULL,
628 NULL,
629 NULL,
630 NULL,
631 NULL,
632 NULL,
633 NULL,
634 NULL,
635 NULL,
636 NULL
637 };
638
639
640 struct common_ie_header {
641 u_int8_t ie_id;
642 u_int8_t ie_len;
643 };
644
645 static int fr_q933_print_ie_codeset5(const struct common_ie_header *ie_p,
646 const u_char *p);
647
648 typedef int (*codeset_pr_func_t)(const struct common_ie_header *ie_p,
649 const u_char *p);
650
651 /* array of 16 codepages - currently we only support codepage 5 */
652 static codeset_pr_func_t fr_q933_print_ie_codeset[] = {
653 NULL,
654 NULL,
655 NULL,
656 NULL,
657 NULL,
658 fr_q933_print_ie_codeset5,
659 NULL,
660 NULL,
661 NULL,
662 NULL,
663 NULL,
664 NULL,
665 NULL,
666 NULL,
667 NULL,
668 NULL
669 };
670
671 void
672 q933_print(const u_char *p, u_int length)
673 {
674 const u_char *ptemp = p;
675 struct common_ie_header *ie_p;
676 int olen;
677 int is_ansi = 0;
678 u_int codeset;
679 u_int ie_is_known = 0;
680
681 if (length < 9) { /* shortest: Q.933a LINK VERIFY */
682 printf("[|q.933]");
683 return;
684 }
685
686 codeset = p[2]&0x0f; /* extract the codeset */
687
688 if (p[2] == MSG_ANSI_LOCKING_SHIFT)
689 is_ansi = 1;
690
691 printf("%s", eflag ? "" : "Q.933, ");
692
693 /* printing out header part */
694 printf(is_ansi ? "ANSI" : "CCITT");
695
696 if (p[0])
697 printf(", Call Ref: 0x%02x", p[0]);
698
699 if (vflag)
700 printf(", %s (0x%02x), length %u",
701 tok2str(fr_q933_msg_values,"unknown message",p[1]),
702 p[1],
703 length);
704 else
705 printf(", %s",
706 tok2str(fr_q933_msg_values,"unknown message 0x%02x",p[1]));
707
708 olen = length; /* preserve the original length for non verbose mode */
709
710 if (length < (u_int)(2 - is_ansi)) {
711 printf("[|q.933]");
712 return;
713 }
714 length -= 2 - is_ansi;
715 ptemp += 2 + is_ansi;
716
717 /* Loop through the rest of IE */
718 while (length > sizeof(struct common_ie_header)) {
719 ie_p = (struct common_ie_header *)ptemp;
720 if (length < sizeof(struct common_ie_header) ||
721 length < sizeof(struct common_ie_header) + ie_p->ie_len) {
722 if (vflag) /* not bark if there is just a trailer */
723 printf("\n[|q.933]");
724 else
725 printf(", length %u",olen);
726 return;
727 }
728
729 /* lets do the full IE parsing only in verbose mode
730 * however some IEs (DLCI Status, Link Verify)
731 * are also intereststing in non-verbose mode */
732 if (vflag)
733 printf("\n\t%s IE (%u), length %u: ",
734 tok2str(fr_q933_ie_codesets[codeset],"unknown",ie_p->ie_id),
735 ie_p->ie_id,
736 ie_p->ie_len);
737
738 if (fr_q933_print_ie_codeset[codeset] != NULL)
739 ie_is_known = fr_q933_print_ie_codeset[codeset](ie_p, ptemp);
740
741 if (vflag >= 1 && !ie_is_known)
742 print_unknown_data(ptemp+2,"\n\t",ie_p->ie_len);
743
744 /* do we want to see a hexdump of the IE ? */
745 if (vflag> 1 && ie_is_known)
746 print_unknown_data(ptemp+2,"\n\t ",ie_p->ie_len);
747
748 length = length - ie_p->ie_len - 2;
749 ptemp = ptemp + ie_p->ie_len + 2;
750 }
751 if (!vflag)
752 printf(", length %u",olen);
753 }
754
755 static int
756 fr_q933_print_ie_codeset5(const struct common_ie_header *ie_p, const u_char *p)
757 {
758 u_int dlci;
759
760 switch (ie_p->ie_id) {
761
762 case FR_LMI_ANSI_REPORT_TYPE_IE: /* fall through */
763 case FR_LMI_CCITT_REPORT_TYPE_IE:
764 if (vflag)
765 printf("%s (%u)",
766 tok2str(fr_lmi_report_type_ie_values,"unknown",p[2]),
767 p[2]);
768 return 1;
769
770 case FR_LMI_ANSI_LINK_VERIFY_IE: /* fall through */
771 case FR_LMI_CCITT_LINK_VERIFY_IE:
772 case FR_LMI_ANSI_LINK_VERIFY_IE_91:
773 if (!vflag)
774 printf(", ");
775 printf("TX Seq: %3d, RX Seq: %3d", p[2], p[3]);
776 return 1;
777
778 case FR_LMI_ANSI_PVC_STATUS_IE: /* fall through */
779 case FR_LMI_CCITT_PVC_STATUS_IE:
780 if (!vflag)
781 printf(", ");
782 /* now parse the DLCI information element. */
783 if ((ie_p->ie_len < 3) ||
784 (p[2] & 0x80) ||
785 ((ie_p->ie_len == 3) && !(p[3] & 0x80)) ||
786 ((ie_p->ie_len == 4) && ((p[3] & 0x80) || !(p[4] & 0x80))) ||
787 ((ie_p->ie_len == 5) && ((p[3] & 0x80) || (p[4] & 0x80) ||
788 !(p[5] & 0x80))) ||
789 (ie_p->ie_len > 5) ||
790 !(p[ie_p->ie_len + 1] & 0x80))
791 printf("Invalid DLCI IE");
792
793 dlci = ((p[2] & 0x3F) << 4) | ((p[3] & 0x78) >> 3);
794 if (ie_p->ie_len == 4)
795 dlci = (dlci << 6) | ((p[4] & 0x7E) >> 1);
796 else if (ie_p->ie_len == 5)
797 dlci = (dlci << 13) | (p[4] & 0x7F) | ((p[5] & 0x7E) >> 1);
798
799 printf("DLCI %u: status %s%s", dlci,
800 p[ie_p->ie_len + 1] & 0x8 ? "New, " : "",
801 p[ie_p->ie_len + 1] & 0x2 ? "Active" : "Inactive");
802 return 1;
803 }
804
805 return 0;
806 }
[mirror] the TCPdump network dissector