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[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 #define NETDISSECT_REWORKED
23 #ifdef HAVE_CONFIG_H
24 #include "config.h"
25 #endif
26
27 #include <tcpdump-stdinc.h>
28
29 #include <stdio.h>
30 #include <string.h>
31
32 #include "interface.h"
33 #include "addrtoname.h"
34 #include "ethertype.h"
35 #include "nlpid.h"
36 #include "extract.h"
37 #include "oui.h"
38
39 static void frf15_print(netdissect_options *ndo, const u_char *, u_int);
40
41 /*
42 * the frame relay header has a variable length
43 *
44 * the EA bit determines if there is another byte
45 * in the header
46 *
47 * minimum header length is 2 bytes
48 * maximum header length is 4 bytes
49 *
50 * 7 6 5 4 3 2 1 0
51 * +----+----+----+----+----+----+----+----+
52 * | DLCI (6 bits) | CR | EA |
53 * +----+----+----+----+----+----+----+----+
54 * | DLCI (4 bits) |FECN|BECN| DE | EA |
55 * +----+----+----+----+----+----+----+----+
56 * | DLCI (7 bits) | EA |
57 * +----+----+----+----+----+----+----+----+
58 * | DLCI (6 bits) |SDLC| EA |
59 * +----+----+----+----+----+----+----+----+
60 */
61
62 #define FR_EA_BIT 0x01
63
64 #define FR_CR_BIT 0x02000000
65 #define FR_DE_BIT 0x00020000
66 #define FR_BECN_BIT 0x00040000
67 #define FR_FECN_BIT 0x00080000
68 #define FR_SDLC_BIT 0x00000002
69
70
71 static const struct tok fr_header_flag_values[] = {
72 { FR_CR_BIT, "C!" },
73 { FR_DE_BIT, "DE" },
74 { FR_BECN_BIT, "BECN" },
75 { FR_FECN_BIT, "FECN" },
76 { FR_SDLC_BIT, "sdlcore" },
77 { 0, NULL }
78 };
79
80 /* FRF.15 / FRF.16 */
81 #define MFR_B_BIT 0x80
82 #define MFR_E_BIT 0x40
83 #define MFR_C_BIT 0x20
84 #define MFR_BEC_MASK (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT)
85 #define MFR_CTRL_FRAME (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT)
86 #define MFR_FRAG_FRAME (MFR_B_BIT | MFR_E_BIT )
87
88 static const struct tok frf_flag_values[] = {
89 { MFR_B_BIT, "Begin" },
90 { MFR_E_BIT, "End" },
91 { MFR_C_BIT, "Control" },
92 { 0, NULL }
93 };
94
95 /* Finds out Q.922 address length, DLCI and flags. Returns 0 on success
96 * save the flags dep. on address length
97 */
98 static int parse_q922_addr(const u_char *p, u_int *dlci,
99 u_int *addr_len, uint8_t *flags)
100 {
101 if ((p[0] & FR_EA_BIT))
102 return -1;
103
104 *addr_len = 2;
105 *dlci = ((p[0] & 0xFC) << 2) | ((p[1] & 0xF0) >> 4);
106
107 flags[0] = p[0] & 0x02; /* populate the first flag fields */
108 flags[1] = p[1] & 0x0c;
109 flags[2] = 0; /* clear the rest of the flags */
110 flags[3] = 0;
111
112 if (p[1] & FR_EA_BIT)
113 return 0; /* 2-byte Q.922 address */
114
115 p += 2;
116 (*addr_len)++; /* 3- or 4-byte Q.922 address */
117 if ((p[0] & FR_EA_BIT) == 0) {
118 *dlci = (*dlci << 7) | (p[0] >> 1);
119 (*addr_len)++; /* 4-byte Q.922 address */
120 p++;
121 }
122
123 if ((p[0] & FR_EA_BIT) == 0)
124 return -1; /* more than 4 bytes of Q.922 address? */
125
126 flags[3] = p[0] & 0x02;
127
128 *dlci = (*dlci << 6) | (p[0] >> 2);
129
130 return 0;
131 }
132
133 char *q922_string(const u_char *p) {
134
135 static u_int dlci, addr_len;
136 static uint8_t flags[4];
137 static char buffer[sizeof("DLCI xxxxxxxxxx")];
138 memset(buffer, 0, sizeof(buffer));
139
140 if (parse_q922_addr(p, &dlci, &addr_len, flags) == 0){
141 snprintf(buffer, sizeof(buffer), "DLCI %u", dlci);
142 }
143
144 return buffer;
145 }
146
147
148 /* Frame Relay packet structure, with flags and CRC removed
149
150 +---------------------------+
151 | Q.922 Address* |
152 +-- --+
153 | |
154 +---------------------------+
155 | Control (UI = 0x03) |
156 +---------------------------+
157 | Optional Pad (0x00) |
158 +---------------------------+
159 | NLPID |
160 +---------------------------+
161 | . |
162 | . |
163 | . |
164 | Data |
165 | . |
166 | . |
167 +---------------------------+
168
169 * Q.922 addresses, as presently defined, are two octets and
170 contain a 10-bit DLCI. In some networks Q.922 addresses
171 may optionally be increased to three or four octets.
172 */
173
174 static u_int
175 fr_hdrlen(const u_char *p, u_int addr_len)
176 {
177 if (!p[addr_len + 1] /* pad exist */)
178 return addr_len + 1 /* UI */ + 1 /* pad */ + 1 /* NLPID */;
179 else
180 return addr_len + 1 /* UI */ + 1 /* NLPID */;
181 }
182
183 static void
184 fr_hdr_print(netdissect_options *ndo,
185 int length, u_int addr_len, u_int dlci, uint8_t *flags, uint16_t nlpid)
186 {
187 if (ndo->ndo_qflag) {
188 ND_PRINT((ndo, "Q.922, DLCI %u, length %u: ",
189 dlci,
190 length));
191 } else {
192 if (nlpid <= 0xff) /* if its smaller than 256 then its a NLPID */
193 ND_PRINT((ndo, "Q.922, hdr-len %u, DLCI %u, Flags [%s], NLPID %s (0x%02x), length %u: ",
194 addr_len,
195 dlci,
196 bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
197 tok2str(nlpid_values,"unknown", nlpid),
198 nlpid,
199 length));
200 else /* must be an ethertype */
201 ND_PRINT((ndo, "Q.922, hdr-len %u, DLCI %u, Flags [%s], cisco-ethertype %s (0x%04x), length %u: ",
202 addr_len,
203 dlci,
204 bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
205 tok2str(ethertype_values, "unknown", nlpid),
206 nlpid,
207 length));
208 }
209 }
210
211 u_int
212 fr_if_print(netdissect_options *ndo,
213 const struct pcap_pkthdr *h, register const u_char *p)
214 {
215 register u_int length = h->len;
216 register u_int caplen = h->caplen;
217
218 ND_TCHECK2(*p, 4); /* minimum frame header length */
219
220 if ((length = fr_print(ndo, p, length)) == 0)
221 return (0);
222 else
223 return length;
224 trunc:
225 ND_PRINT((ndo, "[|fr]"));
226 return caplen;
227 }
228
229 u_int
230 fr_print(netdissect_options *ndo,
231 register const u_char *p, u_int length)
232 {
233 uint16_t extracted_ethertype;
234 u_int dlci;
235 u_int addr_len;
236 uint16_t nlpid;
237 u_int hdr_len;
238 uint8_t flags[4];
239
240 if (parse_q922_addr(p, &dlci, &addr_len, flags)) {
241 ND_PRINT((ndo, "Q.922, invalid address"));
242 return 0;
243 }
244
245 ND_TCHECK2(*p, addr_len+1+1);
246 hdr_len = fr_hdrlen(p, addr_len);
247 ND_TCHECK2(*p, hdr_len);
248
249 if (p[addr_len] != 0x03 && dlci != 0) {
250
251 /* lets figure out if we have cisco style encapsulation: */
252 extracted_ethertype = EXTRACT_16BITS(p+addr_len);
253
254 if (ndo->ndo_eflag)
255 fr_hdr_print(ndo, length, addr_len, dlci, flags, extracted_ethertype);
256
257 if (ethertype_print(ndo, extracted_ethertype,
258 p+addr_len+ETHERTYPE_LEN,
259 length-addr_len-ETHERTYPE_LEN,
260 length-addr_len-ETHERTYPE_LEN) == 0)
261 /* ether_type not known, probably it wasn't one */
262 ND_PRINT((ndo, "UI %02x! ", p[addr_len]));
263 else
264 return hdr_len;
265 }
266
267 if (!p[addr_len + 1]) { /* pad byte should be used with 3-byte Q.922 */
268 if (addr_len != 3)
269 ND_PRINT((ndo, "Pad! "));
270 } else if (addr_len == 3)
271 ND_PRINT((ndo, "No pad! "));
272
273 nlpid = p[hdr_len - 1];
274
275 if (ndo->ndo_eflag)
276 fr_hdr_print(ndo, length, addr_len, dlci, flags, nlpid);
277 p += hdr_len;
278 length -= hdr_len;
279
280 switch (nlpid) {
281 case NLPID_IP:
282 ip_print(ndo, p, length);
283 break;
284
285 case NLPID_IP6:
286 ip6_print(ndo, p, length);
287 break;
288
289 case NLPID_CLNP:
290 case NLPID_ESIS:
291 case NLPID_ISIS:
292 isoclns_print(ndo, p - 1, length + 1, length + 1); /* OSI printers need the NLPID field */
293 break;
294
295 case NLPID_SNAP:
296 if (snap_print(ndo, p, length, length, 0) == 0) {
297 /* ether_type not known, print raw packet */
298 if (!ndo->ndo_eflag)
299 fr_hdr_print(ndo, length + hdr_len, hdr_len,
300 dlci, flags, nlpid);
301 if (!ndo->ndo_suppress_default_print)
302 ND_DEFAULTPRINT(p - hdr_len, length + hdr_len);
303 }
304 break;
305
306 case NLPID_Q933:
307 q933_print(ndo, p, length);
308 break;
309
310 case NLPID_MFR:
311 frf15_print(ndo, p, length);
312 break;
313
314 case NLPID_PPP:
315 ppp_print(ndo, p, length);
316 break;
317
318 default:
319 if (!ndo->ndo_eflag)
320 fr_hdr_print(ndo, length + hdr_len, addr_len,
321 dlci, flags, nlpid);
322 if (!ndo->ndo_xflag)
323 ND_DEFAULTPRINT(p, length);
324 }
325
326 return hdr_len;
327
328 trunc:
329 ND_PRINT((ndo, "[|fr]"));
330 return 0;
331
332 }
333
334 u_int
335 mfr_if_print(netdissect_options *ndo,
336 const struct pcap_pkthdr *h, register const u_char *p)
337 {
338 register u_int length = h->len;
339 register u_int caplen = h->caplen;
340
341 ND_TCHECK2(*p, 2); /* minimum frame header length */
342
343 if ((length = mfr_print(ndo, p, length)) == 0)
344 return (0);
345 else
346 return length;
347 trunc:
348 ND_PRINT((ndo, "[|mfr]"));
349 return caplen;
350 }
351
352
353 #define MFR_CTRL_MSG_ADD_LINK 1
354 #define MFR_CTRL_MSG_ADD_LINK_ACK 2
355 #define MFR_CTRL_MSG_ADD_LINK_REJ 3
356 #define MFR_CTRL_MSG_HELLO 4
357 #define MFR_CTRL_MSG_HELLO_ACK 5
358 #define MFR_CTRL_MSG_REMOVE_LINK 6
359 #define MFR_CTRL_MSG_REMOVE_LINK_ACK 7
360
361 static const struct tok mfr_ctrl_msg_values[] = {
362 { MFR_CTRL_MSG_ADD_LINK, "Add Link" },
363 { MFR_CTRL_MSG_ADD_LINK_ACK, "Add Link ACK" },
364 { MFR_CTRL_MSG_ADD_LINK_REJ, "Add Link Reject" },
365 { MFR_CTRL_MSG_HELLO, "Hello" },
366 { MFR_CTRL_MSG_HELLO_ACK, "Hello ACK" },
367 { MFR_CTRL_MSG_REMOVE_LINK, "Remove Link" },
368 { MFR_CTRL_MSG_REMOVE_LINK_ACK, "Remove Link ACK" },
369 { 0, NULL }
370 };
371
372 #define MFR_CTRL_IE_BUNDLE_ID 1
373 #define MFR_CTRL_IE_LINK_ID 2
374 #define MFR_CTRL_IE_MAGIC_NUM 3
375 #define MFR_CTRL_IE_TIMESTAMP 5
376 #define MFR_CTRL_IE_VENDOR_EXT 6
377 #define MFR_CTRL_IE_CAUSE 7
378
379 static const struct tok mfr_ctrl_ie_values[] = {
380 { MFR_CTRL_IE_BUNDLE_ID, "Bundle ID"},
381 { MFR_CTRL_IE_LINK_ID, "Link ID"},
382 { MFR_CTRL_IE_MAGIC_NUM, "Magic Number"},
383 { MFR_CTRL_IE_TIMESTAMP, "Timestamp"},
384 { MFR_CTRL_IE_VENDOR_EXT, "Vendor Extension"},
385 { MFR_CTRL_IE_CAUSE, "Cause"},
386 { 0, NULL }
387 };
388
389 #define MFR_ID_STRING_MAXLEN 50
390
391 struct ie_tlv_header_t {
392 uint8_t ie_type;
393 uint8_t ie_len;
394 };
395
396 u_int
397 mfr_print(netdissect_options *ndo,
398 register const u_char *p, u_int length)
399 {
400 u_int tlen,idx,hdr_len = 0;
401 uint16_t sequence_num;
402 uint8_t ie_type,ie_len;
403 const uint8_t *tptr;
404
405
406 /*
407 * FRF.16 Link Integrity Control Frame
408 *
409 * 7 6 5 4 3 2 1 0
410 * +----+----+----+----+----+----+----+----+
411 * | B | E | C=1| 0 0 0 0 | EA |
412 * +----+----+----+----+----+----+----+----+
413 * | 0 0 0 0 0 0 0 0 |
414 * +----+----+----+----+----+----+----+----+
415 * | message type |
416 * +----+----+----+----+----+----+----+----+
417 */
418
419 ND_TCHECK2(*p, 4); /* minimum frame header length */
420
421 if ((p[0] & MFR_BEC_MASK) == MFR_CTRL_FRAME && p[1] == 0) {
422 ND_PRINT((ndo, "FRF.16 Control, Flags [%s], %s, length %u",
423 bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK)),
424 tok2str(mfr_ctrl_msg_values,"Unknown Message (0x%02x)",p[2]),
425 length));
426 tptr = p + 3;
427 tlen = length -3;
428 hdr_len = 3;
429
430 if (!ndo->ndo_vflag)
431 return hdr_len;
432
433 while (tlen>sizeof(struct ie_tlv_header_t)) {
434 ND_TCHECK2(*tptr, sizeof(struct ie_tlv_header_t));
435 ie_type=tptr[0];
436 ie_len=tptr[1];
437
438 ND_PRINT((ndo, "\n\tIE %s (%u), length %u: ",
439 tok2str(mfr_ctrl_ie_values,"Unknown",ie_type),
440 ie_type,
441 ie_len));
442
443 /* infinite loop check */
444 if (ie_type == 0 || ie_len <= sizeof(struct ie_tlv_header_t))
445 return hdr_len;
446
447 ND_TCHECK2(*tptr, ie_len);
448 tptr+=sizeof(struct ie_tlv_header_t);
449 /* tlv len includes header */
450 ie_len-=sizeof(struct ie_tlv_header_t);
451 tlen-=sizeof(struct ie_tlv_header_t);
452
453 switch (ie_type) {
454
455 case MFR_CTRL_IE_MAGIC_NUM:
456 ND_PRINT((ndo, "0x%08x", EXTRACT_32BITS(tptr)));
457 break;
458
459 case MFR_CTRL_IE_BUNDLE_ID: /* same message format */
460 case MFR_CTRL_IE_LINK_ID:
461 for (idx = 0; idx < ie_len && idx < MFR_ID_STRING_MAXLEN; idx++) {
462 if (*(tptr+idx) != 0) /* don't print null termination */
463 safeputchar(ndo, *(tptr + idx));
464 else
465 break;
466 }
467 break;
468
469 case MFR_CTRL_IE_TIMESTAMP:
470 if (ie_len == sizeof(struct timeval)) {
471 ts_print(ndo, (const struct timeval *)tptr);
472 break;
473 }
474 /* fall through and hexdump if no unix timestamp */
475
476 /*
477 * FIXME those are the defined IEs that lack a decoder
478 * you are welcome to contribute code ;-)
479 */
480
481 case MFR_CTRL_IE_VENDOR_EXT:
482 case MFR_CTRL_IE_CAUSE:
483
484 default:
485 if (ndo->ndo_vflag <= 1)
486 print_unknown_data(ndo, tptr, "\n\t ", ie_len);
487 break;
488 }
489
490 /* do we want to see a hexdump of the IE ? */
491 if (ndo->ndo_vflag > 1 )
492 print_unknown_data(ndo, tptr, "\n\t ", ie_len);
493
494 tlen-=ie_len;
495 tptr+=ie_len;
496 }
497 return hdr_len;
498 }
499 /*
500 * FRF.16 Fragmentation Frame
501 *
502 * 7 6 5 4 3 2 1 0
503 * +----+----+----+----+----+----+----+----+
504 * | B | E | C=0|seq. (high 4 bits) | EA |
505 * +----+----+----+----+----+----+----+----+
506 * | sequence (low 8 bits) |
507 * +----+----+----+----+----+----+----+----+
508 * | DLCI (6 bits) | CR | EA |
509 * +----+----+----+----+----+----+----+----+
510 * | DLCI (4 bits) |FECN|BECN| DE | EA |
511 * +----+----+----+----+----+----+----+----+
512 */
513
514 sequence_num = (p[0]&0x1e)<<7 | p[1];
515 /* whole packet or first fragment ? */
516 if ((p[0] & MFR_BEC_MASK) == MFR_FRAG_FRAME ||
517 (p[0] & MFR_BEC_MASK) == MFR_B_BIT) {
518 ND_PRINT((ndo, "FRF.16 Frag, seq %u, Flags [%s], ",
519 sequence_num,
520 bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK))));
521 hdr_len = 2;
522 fr_print(ndo, p+hdr_len,length-hdr_len);
523 return hdr_len;
524 }
525
526 /* must be a middle or the last fragment */
527 ND_PRINT((ndo, "FRF.16 Frag, seq %u, Flags [%s]",
528 sequence_num,
529 bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK))));
530 print_unknown_data(ndo, p, "\n\t", length);
531
532 return hdr_len;
533
534 trunc:
535 ND_PRINT((ndo, "[|mfr]"));
536 return length;
537 }
538
539 /* an NLPID of 0xb1 indicates a 2-byte
540 * FRF.15 header
541 *
542 * 7 6 5 4 3 2 1 0
543 * +----+----+----+----+----+----+----+----+
544 * ~ Q.922 header ~
545 * +----+----+----+----+----+----+----+----+
546 * | NLPID (8 bits) | NLPID=0xb1
547 * +----+----+----+----+----+----+----+----+
548 * | B | E | C |seq. (high 4 bits) | R |
549 * +----+----+----+----+----+----+----+----+
550 * | sequence (low 8 bits) |
551 * +----+----+----+----+----+----+----+----+
552 */
553
554 #define FR_FRF15_FRAGTYPE 0x01
555
556 static void
557 frf15_print(netdissect_options *ndo,
558 const u_char *p, u_int length) {
559
560 uint16_t sequence_num, flags;
561
562 flags = p[0]&MFR_BEC_MASK;
563 sequence_num = (p[0]&0x1e)<<7 | p[1];
564
565 ND_PRINT((ndo, "FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u",
566 sequence_num,
567 bittok2str(frf_flag_values,"none",flags),
568 p[0]&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End",
569 length));
570
571 /* TODO:
572 * depending on all permutations of the B, E and C bit
573 * dig as deep as we can - e.g. on the first (B) fragment
574 * there is enough payload to print the IP header
575 * on non (B) fragments it depends if the fragmentation
576 * model is end-to-end or interface based wether we want to print
577 * another Q.922 header
578 */
579
580 }
581
582 /*
583 * Q.933 decoding portion for framerelay specific.
584 */
585
586 /* Q.933 packet format
587 Format of Other Protocols
588 using Q.933 NLPID
589 +-------------------------------+
590 | Q.922 Address |
591 +---------------+---------------+
592 |Control 0x03 | NLPID 0x08 |
593 +---------------+---------------+
594 | L2 Protocol ID |
595 | octet 1 | octet 2 |
596 +-------------------------------+
597 | L3 Protocol ID |
598 | octet 2 | octet 2 |
599 +-------------------------------+
600 | Protocol Data |
601 +-------------------------------+
602 | FCS |
603 +-------------------------------+
604 */
605
606 /* L2 (Octet 1)- Call Reference Usually is 0x0 */
607
608 /*
609 * L2 (Octet 2)- Message Types definition 1 byte long.
610 */
611 /* Call Establish */
612 #define MSG_TYPE_ESC_TO_NATIONAL 0x00
613 #define MSG_TYPE_ALERT 0x01
614 #define MSG_TYPE_CALL_PROCEEDING 0x02
615 #define MSG_TYPE_CONNECT 0x07
616 #define MSG_TYPE_CONNECT_ACK 0x0F
617 #define MSG_TYPE_PROGRESS 0x03
618 #define MSG_TYPE_SETUP 0x05
619 /* Call Clear */
620 #define MSG_TYPE_DISCONNECT 0x45
621 #define MSG_TYPE_RELEASE 0x4D
622 #define MSG_TYPE_RELEASE_COMPLETE 0x5A
623 #define MSG_TYPE_RESTART 0x46
624 #define MSG_TYPE_RESTART_ACK 0x4E
625 /* Status */
626 #define MSG_TYPE_STATUS 0x7D
627 #define MSG_TYPE_STATUS_ENQ 0x75
628
629 static const struct tok fr_q933_msg_values[] = {
630 { MSG_TYPE_ESC_TO_NATIONAL, "ESC to National" },
631 { MSG_TYPE_ALERT, "Alert" },
632 { MSG_TYPE_CALL_PROCEEDING, "Call proceeding" },
633 { MSG_TYPE_CONNECT, "Connect" },
634 { MSG_TYPE_CONNECT_ACK, "Connect ACK" },
635 { MSG_TYPE_PROGRESS, "Progress" },
636 { MSG_TYPE_SETUP, "Setup" },
637 { MSG_TYPE_DISCONNECT, "Disconnect" },
638 { MSG_TYPE_RELEASE, "Release" },
639 { MSG_TYPE_RELEASE_COMPLETE, "Release Complete" },
640 { MSG_TYPE_RESTART, "Restart" },
641 { MSG_TYPE_RESTART_ACK, "Restart ACK" },
642 { MSG_TYPE_STATUS, "Status Reply" },
643 { MSG_TYPE_STATUS_ENQ, "Status Enquiry" },
644 { 0, NULL }
645 };
646
647 #define MSG_ANSI_LOCKING_SHIFT 0x95
648
649 #define FR_LMI_ANSI_REPORT_TYPE_IE 0x01
650 #define FR_LMI_ANSI_LINK_VERIFY_IE_91 0x19 /* details? */
651 #define FR_LMI_ANSI_LINK_VERIFY_IE 0x03
652 #define FR_LMI_ANSI_PVC_STATUS_IE 0x07
653
654 #define FR_LMI_CCITT_REPORT_TYPE_IE 0x51
655 #define FR_LMI_CCITT_LINK_VERIFY_IE 0x53
656 #define FR_LMI_CCITT_PVC_STATUS_IE 0x57
657
658 static const struct tok fr_q933_ie_values_codeset5[] = {
659 { FR_LMI_ANSI_REPORT_TYPE_IE, "ANSI Report Type" },
660 { FR_LMI_ANSI_LINK_VERIFY_IE_91, "ANSI Link Verify" },
661 { FR_LMI_ANSI_LINK_VERIFY_IE, "ANSI Link Verify" },
662 { FR_LMI_ANSI_PVC_STATUS_IE, "ANSI PVC Status" },
663 { FR_LMI_CCITT_REPORT_TYPE_IE, "CCITT Report Type" },
664 { FR_LMI_CCITT_LINK_VERIFY_IE, "CCITT Link Verify" },
665 { FR_LMI_CCITT_PVC_STATUS_IE, "CCITT PVC Status" },
666 { 0, NULL }
667 };
668
669 #define FR_LMI_REPORT_TYPE_IE_FULL_STATUS 0
670 #define FR_LMI_REPORT_TYPE_IE_LINK_VERIFY 1
671 #define FR_LMI_REPORT_TYPE_IE_ASYNC_PVC 2
672
673 static const struct tok fr_lmi_report_type_ie_values[] = {
674 { FR_LMI_REPORT_TYPE_IE_FULL_STATUS, "Full Status" },
675 { FR_LMI_REPORT_TYPE_IE_LINK_VERIFY, "Link verify" },
676 { FR_LMI_REPORT_TYPE_IE_ASYNC_PVC, "Async PVC Status" },
677 { 0, NULL }
678 };
679
680 /* array of 16 codepages - currently we only support codepage 1,5 */
681 static const struct tok *fr_q933_ie_codesets[] = {
682 NULL,
683 fr_q933_ie_values_codeset5,
684 NULL,
685 NULL,
686 NULL,
687 fr_q933_ie_values_codeset5,
688 NULL,
689 NULL,
690 NULL,
691 NULL,
692 NULL,
693 NULL,
694 NULL,
695 NULL,
696 NULL,
697 NULL
698 };
699
700 static int fr_q933_print_ie_codeset5(netdissect_options *ndo,
701 const struct ie_tlv_header_t *ie_p, const u_char *p);
702
703 typedef int (*codeset_pr_func_t)(netdissect_options *,
704 const struct ie_tlv_header_t *ie_p, const u_char *p);
705
706 /* array of 16 codepages - currently we only support codepage 1,5 */
707 static const codeset_pr_func_t fr_q933_print_ie_codeset[] = {
708 NULL,
709 fr_q933_print_ie_codeset5,
710 NULL,
711 NULL,
712 NULL,
713 fr_q933_print_ie_codeset5,
714 NULL,
715 NULL,
716 NULL,
717 NULL,
718 NULL,
719 NULL,
720 NULL,
721 NULL,
722 NULL,
723 NULL
724 };
725
726 void
727 q933_print(netdissect_options *ndo,
728 const u_char *p, u_int length)
729 {
730 const u_char *ptemp = p;
731 struct ie_tlv_header_t *ie_p;
732 int olen;
733 int is_ansi = 0;
734 u_int codeset;
735 u_int ie_is_known = 0;
736
737 if (length < 9) { /* shortest: Q.933a LINK VERIFY */
738 ND_PRINT((ndo, "[|q.933]"));
739 return;
740 }
741
742 codeset = p[2]&0x0f; /* extract the codeset */
743
744 if (p[2] == MSG_ANSI_LOCKING_SHIFT) {
745 is_ansi = 1;
746 }
747
748 ND_PRINT((ndo, "%s", ndo->ndo_eflag ? "" : "Q.933, "));
749
750 /* printing out header part */
751 ND_PRINT((ndo, "%s, codeset %u", is_ansi ? "ANSI" : "CCITT", codeset));
752
753 if (p[0]) {
754 ND_PRINT((ndo, ", Call Ref: 0x%02x", p[0]));
755 }
756 if (ndo->ndo_vflag) {
757 ND_PRINT((ndo, ", %s (0x%02x), length %u",
758 tok2str(fr_q933_msg_values,
759 "unknown message", p[1]),
760 p[1],
761 length));
762 } else {
763 ND_PRINT((ndo, ", %s",
764 tok2str(fr_q933_msg_values,
765 "unknown message 0x%02x", p[1])));
766 }
767
768 olen = length; /* preserve the original length for non verbose mode */
769
770 if (length < (u_int)(2 - is_ansi)) {
771 ND_PRINT((ndo, "[|q.933]"));
772 return;
773 }
774 length -= 2 + is_ansi;
775 ptemp += 2 + is_ansi;
776
777 /* Loop through the rest of IE */
778 while (length > sizeof(struct ie_tlv_header_t)) {
779 ie_p = (struct ie_tlv_header_t *)ptemp;
780 if (length < sizeof(struct ie_tlv_header_t) ||
781 length < sizeof(struct ie_tlv_header_t) + ie_p->ie_len) {
782 if (ndo->ndo_vflag) { /* not bark if there is just a trailer */
783 ND_PRINT((ndo, "\n[|q.933]"));
784 } else {
785 ND_PRINT((ndo, ", length %u", olen));
786 }
787 return;
788 }
789
790 /* lets do the full IE parsing only in verbose mode
791 * however some IEs (DLCI Status, Link Verify)
792 * are also interestting in non-verbose mode */
793 if (ndo->ndo_vflag) {
794 ND_PRINT((ndo, "\n\t%s IE (0x%02x), length %u: ",
795 tok2str(fr_q933_ie_codesets[codeset],
796 "unknown", ie_p->ie_type),
797 ie_p->ie_type,
798 ie_p->ie_len));
799 }
800
801 /* sanity check */
802 if (ie_p->ie_type == 0 || ie_p->ie_len == 0) {
803 return;
804 }
805
806 if (fr_q933_print_ie_codeset[codeset] != NULL) {
807 ie_is_known = fr_q933_print_ie_codeset[codeset](ndo, ie_p, ptemp);
808 }
809
810 if (ndo->ndo_vflag >= 1 && !ie_is_known) {
811 print_unknown_data(ndo, ptemp+2, "\n\t", ie_p->ie_len);
812 }
813
814 /* do we want to see a hexdump of the IE ? */
815 if (ndo->ndo_vflag> 1 && ie_is_known) {
816 print_unknown_data(ndo, ptemp+2, "\n\t ", ie_p->ie_len);
817 }
818
819 length = length - ie_p->ie_len - 2;
820 ptemp = ptemp + ie_p->ie_len + 2;
821 }
822 if (!ndo->ndo_vflag) {
823 ND_PRINT((ndo, ", length %u", olen));
824 }
825 }
826
827 static int
828 fr_q933_print_ie_codeset5(netdissect_options *ndo,
829 const struct ie_tlv_header_t *ie_p, const u_char *p)
830 {
831 u_int dlci;
832
833 switch (ie_p->ie_type) {
834
835 case FR_LMI_ANSI_REPORT_TYPE_IE: /* fall through */
836 case FR_LMI_CCITT_REPORT_TYPE_IE:
837 if (ndo->ndo_vflag) {
838 ND_PRINT((ndo, "%s (%u)",
839 tok2str(fr_lmi_report_type_ie_values,"unknown",p[2]),
840 p[2]));
841 }
842 return 1;
843
844 case FR_LMI_ANSI_LINK_VERIFY_IE: /* fall through */
845 case FR_LMI_CCITT_LINK_VERIFY_IE:
846 case FR_LMI_ANSI_LINK_VERIFY_IE_91:
847 if (!ndo->ndo_vflag) {
848 ND_PRINT((ndo, ", "));
849 }
850 ND_PRINT((ndo, "TX Seq: %3d, RX Seq: %3d", p[2], p[3]));
851 return 1;
852
853 case FR_LMI_ANSI_PVC_STATUS_IE: /* fall through */
854 case FR_LMI_CCITT_PVC_STATUS_IE:
855 if (!ndo->ndo_vflag) {
856 ND_PRINT((ndo, ", "));
857 }
858 /* now parse the DLCI information element. */
859 if ((ie_p->ie_len < 3) ||
860 (p[2] & 0x80) ||
861 ((ie_p->ie_len == 3) && !(p[3] & 0x80)) ||
862 ((ie_p->ie_len == 4) && ((p[3] & 0x80) || !(p[4] & 0x80))) ||
863 ((ie_p->ie_len == 5) && ((p[3] & 0x80) || (p[4] & 0x80) ||
864 !(p[5] & 0x80))) ||
865 (ie_p->ie_len > 5) ||
866 !(p[ie_p->ie_len + 1] & 0x80)) {
867 ND_PRINT((ndo, "Invalid DLCI IE"));
868 }
869
870 dlci = ((p[2] & 0x3F) << 4) | ((p[3] & 0x78) >> 3);
871 if (ie_p->ie_len == 4) {
872 dlci = (dlci << 6) | ((p[4] & 0x7E) >> 1);
873 }
874 else if (ie_p->ie_len == 5) {
875 dlci = (dlci << 13) | (p[4] & 0x7F) | ((p[5] & 0x7E) >> 1);
876 }
877
878 ND_PRINT((ndo, "DLCI %u: status %s%s", dlci,
879 p[ie_p->ie_len + 1] & 0x8 ? "New, " : "",
880 p[ie_p->ie_len + 1] & 0x2 ? "Active" : "Inactive"));
881 return 1;
882 }
883
884 return 0;
885 }
886 /*
887 * Local Variables:
888 * c-style: whitesmith
889 * c-basic-offset: 8
890 * End:
891 */
[mirror] the TCPdump network dissector