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 * $FreeBSD: stable/10/contrib/tcpdump/print-fr.c 235530 2012-05-17 05:11:57Z delphij $
22 */
23
24 #ifndef lint
25 static const char rcsid[] _U_ =
26 "@(#)$Header: /tcpdump/master/tcpdump/print-fr.c,v 1.51 2006-06-23 22:20:32 hannes Exp $ (LBL)";
27 #endif
28
29 #ifdef HAVE_CONFIG_H
30 #include "config.h"
31 #endif
32
33 #include <tcpdump-stdinc.h>
34
35 #include <stdio.h>
36 #include <string.h>
37 #include <pcap.h>
38
39 #include "addrtoname.h"
40 #include "interface.h"
41 #include "ethertype.h"
42 #include "nlpid.h"
43 #include "extract.h"
44 #include "oui.h"
45
46 static void frf15_print(const u_char *, u_int);
47
48 /*
49 * the frame relay header has a variable length
50 *
51 * the EA bit determines if there is another byte
52 * in the header
53 *
54 * minimum header length is 2 bytes
55 * maximum header length is 4 bytes
56 *
57 * 7 6 5 4 3 2 1 0
58 * +----+----+----+----+----+----+----+----+
59 * | DLCI (6 bits) | CR | EA |
60 * +----+----+----+----+----+----+----+----+
61 * | DLCI (4 bits) |FECN|BECN| DE | EA |
62 * +----+----+----+----+----+----+----+----+
63 * | DLCI (7 bits) | EA |
64 * +----+----+----+----+----+----+----+----+
65 * | DLCI (6 bits) |SDLC| EA |
66 * +----+----+----+----+----+----+----+----+
67 */
68
69 #define FR_EA_BIT 0x01
70
71 #define FR_CR_BIT 0x02000000
72 #define FR_DE_BIT 0x00020000
73 #define FR_BECN_BIT 0x00040000
74 #define FR_FECN_BIT 0x00080000
75 #define FR_SDLC_BIT 0x00000002
76
77
78 struct tok fr_header_flag_values[] = {
79 { FR_CR_BIT, "C!" },
80 { FR_DE_BIT, "DE" },
81 { FR_BECN_BIT, "BECN" },
82 { FR_FECN_BIT, "FECN" },
83 { FR_SDLC_BIT, "sdlcore" },
84 { 0, NULL }
85 };
86
87 /* FRF.15 / FRF.16 */
88 #define MFR_B_BIT 0x80
89 #define MFR_E_BIT 0x40
90 #define MFR_C_BIT 0x20
91 #define MFR_BEC_MASK (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT)
92 #define MFR_CTRL_FRAME (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT)
93 #define MFR_FRAG_FRAME (MFR_B_BIT | MFR_E_BIT )
94
95 struct tok frf_flag_values[] = {
96 { MFR_B_BIT, "Begin" },
97 { MFR_E_BIT, "End" },
98 { MFR_C_BIT, "Control" },
99 { 0, NULL }
100 };
101
102 /* Finds out Q.922 address length, DLCI and flags. Returns 0 on success
103 * save the flags dep. on address length
104 */
parse_q922_addr(const u_char * p,u_int * dlci,u_int * addr_len,u_int8_t * flags)105 static int parse_q922_addr(const u_char *p, u_int *dlci,
106 u_int *addr_len, u_int8_t *flags)
107 {
108 if ((p[0] & FR_EA_BIT))
109 return -1;
110
111 *addr_len = 2;
112 *dlci = ((p[0] & 0xFC) << 2) | ((p[1] & 0xF0) >> 4);
113
114 flags[0] = p[0] & 0x02; /* populate the first flag fields */
115 flags[1] = p[1] & 0x0c;
116 flags[2] = 0; /* clear the rest of the flags */
117 flags[3] = 0;
118
119 if (p[1] & FR_EA_BIT)
120 return 0; /* 2-byte Q.922 address */
121
122 p += 2;
123 (*addr_len)++; /* 3- or 4-byte Q.922 address */
124 if ((p[0] & FR_EA_BIT) == 0) {
125 *dlci = (*dlci << 7) | (p[0] >> 1);
126 (*addr_len)++; /* 4-byte Q.922 address */
127 p++;
128 }
129
130 if ((p[0] & FR_EA_BIT) == 0)
131 return -1; /* more than 4 bytes of Q.922 address? */
132
133 flags[3] = p[0] & 0x02;
134
135 *dlci = (*dlci << 6) | (p[0] >> 2);
136
137 return 0;
138 }
139
q922_string(const u_char * p)140 char *q922_string(const u_char *p) {
141
142 static u_int dlci, addr_len;
143 static u_int8_t flags[4];
144 static char buffer[sizeof("DLCI xxxxxxxxxx")];
145 memset(buffer, 0, sizeof(buffer));
146
147 if (parse_q922_addr(p, &dlci, &addr_len, flags) == 0){
148 snprintf(buffer, sizeof(buffer), "DLCI %u", dlci);
149 }
150
151 return buffer;
152 }
153
154
155 /* Frame Relay packet structure, with flags and CRC removed
156
157 +---------------------------+
158 | Q.922 Address* |
159 +-- --+
160 | |
161 +---------------------------+
162 | Control (UI = 0x03) |
163 +---------------------------+
164 | Optional Pad (0x00) |
165 +---------------------------+
166 | NLPID |
167 +---------------------------+
168 | . |
169 | . |
170 | . |
171 | Data |
172 | . |
173 | . |
174 +---------------------------+
175
176 * Q.922 addresses, as presently defined, are two octets and
177 contain a 10-bit DLCI. In some networks Q.922 addresses
178 may optionally be increased to three or four octets.
179 */
180
181 static u_int
fr_hdrlen(const u_char * p,u_int addr_len)182 fr_hdrlen(const u_char *p, u_int addr_len)
183 {
184 if (!p[addr_len + 1] /* pad exist */)
185 return addr_len + 1 /* UI */ + 1 /* pad */ + 1 /* NLPID */;
186 else
187 return addr_len + 1 /* UI */ + 1 /* NLPID */;
188 }
189
190 static void
fr_hdr_print(int length,u_int addr_len,u_int dlci,u_int8_t * flags,u_int16_t nlpid)191 fr_hdr_print(int length, u_int addr_len, u_int dlci, u_int8_t *flags, u_int16_t nlpid)
192 {
193 if (qflag) {
194 (void)printf("Q.922, DLCI %u, length %u: ",
195 dlci,
196 length);
197 } else {
198 if (nlpid <= 0xff) /* if its smaller than 256 then its a NLPID */
199 (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], NLPID %s (0x%02x), length %u: ",
200 addr_len,
201 dlci,
202 bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
203 tok2str(nlpid_values,"unknown", nlpid),
204 nlpid,
205 length);
206 else /* must be an ethertype */
207 (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], cisco-ethertype %s (0x%04x), length %u: ",
208 addr_len,
209 dlci,
210 bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
211 tok2str(ethertype_values, "unknown", nlpid),
212 nlpid,
213 length);
214 }
215 }
216
217 u_int
fr_if_print(const struct pcap_pkthdr * h,register const u_char * p)218 fr_if_print(const struct pcap_pkthdr *h, register const u_char *p)
219 {
220 register u_int length = h->len;
221 register u_int caplen = h->caplen;
222
223 TCHECK2(*p, 4); /* minimum frame header length */
224
225 if ((length = fr_print(p, length)) == 0)
226 return (0);
227 else
228 return length;
229 trunc:
230 printf("[|fr]");
231 return caplen;
232 }
233
234 u_int
fr_print(register const u_char * p,u_int length)235 fr_print(register const u_char *p, u_int length)
236 {
237 u_int16_t extracted_ethertype;
238 u_int dlci;
239 u_int addr_len;
240 u_int16_t nlpid;
241 u_int hdr_len;
242 u_int8_t flags[4];
243
244 if (parse_q922_addr(p, &dlci, &addr_len, flags)) {
245 printf("Q.922, invalid address");
246 return 0;
247 }
248
249 TCHECK2(*p,addr_len+1+1);
250 hdr_len = fr_hdrlen(p, addr_len);
251 TCHECK2(*p,hdr_len);
252
253 if (p[addr_len] != 0x03 && dlci != 0) {
254
255 /* lets figure out if we have cisco style encapsulation: */
256 extracted_ethertype = EXTRACT_16BITS(p+addr_len);
257
258 if (eflag)
259 fr_hdr_print(length, addr_len, dlci, flags, extracted_ethertype);
260
261 if (ethertype_print(gndo, extracted_ethertype,
262 p+addr_len+ETHERTYPE_LEN,
263 length-addr_len-ETHERTYPE_LEN,
264 length-addr_len-ETHERTYPE_LEN) == 0)
265 /* ether_type not known, probably it wasn't one */
266 printf("UI %02x! ", p[addr_len]);
267 else
268 return hdr_len;
269 }
270
271 if (!p[addr_len + 1]) { /* pad byte should be used with 3-byte Q.922 */
272 if (addr_len != 3)
273 printf("Pad! ");
274 } else if (addr_len == 3)
275 printf("No pad! ");
276
277 nlpid = p[hdr_len - 1];
278
279 if (eflag)
280 fr_hdr_print(length, addr_len, dlci, flags, nlpid);
281 p += hdr_len;
282 length -= hdr_len;
283
284 switch (nlpid) {
285 case NLPID_IP:
286 ip_print(gndo, p, length);
287 break;
288
289 #ifdef INET6
290 case NLPID_IP6:
291 ip6_print(gndo, p, length);
292 break;
293 #endif
294 case NLPID_CLNP:
295 case NLPID_ESIS:
296 case NLPID_ISIS:
297 isoclns_print(p-1, length+1, length+1); /* OSI printers need the NLPID field */
298 break;
299
300 case NLPID_SNAP:
301 if (snap_print(p, length, length, 0) == 0) {
302 /* ether_type not known, print raw packet */
303 if (!eflag)
304 fr_hdr_print(length + hdr_len, hdr_len,
305 dlci, flags, nlpid);
306 if (!suppress_default_print)
307 default_print(p - hdr_len, length + hdr_len);
308 }
309 break;
310
311 case NLPID_Q933:
312 q933_print(p, length);
313 break;
314
315 case NLPID_MFR:
316 frf15_print(p, length);
317 break;
318
319 case NLPID_PPP:
320 ppp_print(p, length);
321 break;
322
323 default:
324 if (!eflag)
325 fr_hdr_print(length + hdr_len, addr_len,
326 dlci, flags, nlpid);
327 if (!xflag)
328 default_print(p, length);
329 }
330
331 return hdr_len;
332
333 trunc:
334 printf("[|fr]");
335 return 0;
336
337 }
338
339 u_int
mfr_if_print(const struct pcap_pkthdr * h,register const u_char * p)340 mfr_if_print(const struct pcap_pkthdr *h, register const u_char *p)
341 {
342 register u_int length = h->len;
343 register u_int caplen = h->caplen;
344
345 TCHECK2(*p, 2); /* minimum frame header length */
346
347 if ((length = mfr_print(p, length)) == 0)
348 return (0);
349 else
350 return length;
351 trunc:
352 printf("[|mfr]");
353 return caplen;
354 }
355
356
357 #define MFR_CTRL_MSG_ADD_LINK 1
358 #define MFR_CTRL_MSG_ADD_LINK_ACK 2
359 #define MFR_CTRL_MSG_ADD_LINK_REJ 3
360 #define MFR_CTRL_MSG_HELLO 4
361 #define MFR_CTRL_MSG_HELLO_ACK 5
362 #define MFR_CTRL_MSG_REMOVE_LINK 6
363 #define MFR_CTRL_MSG_REMOVE_LINK_ACK 7
364
365 struct tok mfr_ctrl_msg_values[] = {
366 { MFR_CTRL_MSG_ADD_LINK, "Add Link" },
367 { MFR_CTRL_MSG_ADD_LINK_ACK, "Add Link ACK" },
368 { MFR_CTRL_MSG_ADD_LINK_REJ, "Add Link Reject" },
369 { MFR_CTRL_MSG_HELLO, "Hello" },
370 { MFR_CTRL_MSG_HELLO_ACK, "Hello ACK" },
371 { MFR_CTRL_MSG_REMOVE_LINK, "Remove Link" },
372 { MFR_CTRL_MSG_REMOVE_LINK_ACK, "Remove Link ACK" },
373 { 0, NULL }
374 };
375
376 #define MFR_CTRL_IE_BUNDLE_ID 1
377 #define MFR_CTRL_IE_LINK_ID 2
378 #define MFR_CTRL_IE_MAGIC_NUM 3
379 #define MFR_CTRL_IE_TIMESTAMP 5
380 #define MFR_CTRL_IE_VENDOR_EXT 6
381 #define MFR_CTRL_IE_CAUSE 7
382
383 struct tok mfr_ctrl_ie_values[] = {
384 { MFR_CTRL_IE_BUNDLE_ID, "Bundle ID"},
385 { MFR_CTRL_IE_LINK_ID, "Link ID"},
386 { MFR_CTRL_IE_MAGIC_NUM, "Magic Number"},
387 { MFR_CTRL_IE_TIMESTAMP, "Timestamp"},
388 { MFR_CTRL_IE_VENDOR_EXT, "Vendor Extension"},
389 { MFR_CTRL_IE_CAUSE, "Cause"},
390 { 0, NULL }
391 };
392
393 #define MFR_ID_STRING_MAXLEN 50
394
395 struct ie_tlv_header_t {
396 u_int8_t ie_type;
397 u_int8_t ie_len;
398 };
399
400 u_int
mfr_print(register const u_char * p,u_int length)401 mfr_print(register const u_char *p, u_int length)
402 {
403 u_int tlen,idx,hdr_len = 0;
404 u_int16_t sequence_num;
405 u_int8_t ie_type,ie_len;
406 const u_int8_t *tptr;
407
408
409 /*
410 * FRF.16 Link Integrity Control Frame
411 *
412 * 7 6 5 4 3 2 1 0
413 * +----+----+----+----+----+----+----+----+
414 * | B | E | C=1| 0 0 0 0 | EA |
415 * +----+----+----+----+----+----+----+----+
416 * | 0 0 0 0 0 0 0 0 |
417 * +----+----+----+----+----+----+----+----+
418 * | message type |
419 * +----+----+----+----+----+----+----+----+
420 */
421
422 TCHECK2(*p, 4); /* minimum frame header length */
423
424 if ((p[0] & MFR_BEC_MASK) == MFR_CTRL_FRAME && p[1] == 0) {
425 printf("FRF.16 Control, Flags [%s], %s, length %u",
426 bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK)),
427 tok2str(mfr_ctrl_msg_values,"Unknown Message (0x%02x)",p[2]),
428 length);
429 tptr = p + 3;
430 tlen = length -3;
431 hdr_len = 3;
432
433 if (!vflag)
434 return hdr_len;
435
436 while (tlen>sizeof(struct ie_tlv_header_t)) {
437 TCHECK2(*tptr, sizeof(struct ie_tlv_header_t));
438 ie_type=tptr[0];
439 ie_len=tptr[1];
440
441 printf("\n\tIE %s (%u), length %u: ",
442 tok2str(mfr_ctrl_ie_values,"Unknown",ie_type),
443 ie_type,
444 ie_len);
445
446 /* infinite loop check */
447 if (ie_type == 0 || ie_len <= sizeof(struct ie_tlv_header_t))
448 return hdr_len;
449
450 TCHECK2(*tptr,ie_len);
451 tptr+=sizeof(struct ie_tlv_header_t);
452 /* tlv len includes header */
453 ie_len-=sizeof(struct ie_tlv_header_t);
454 tlen-=sizeof(struct ie_tlv_header_t);
455
456 switch (ie_type) {
457
458 case MFR_CTRL_IE_MAGIC_NUM:
459 printf("0x%08x",EXTRACT_32BITS(tptr));
460 break;
461
462 case MFR_CTRL_IE_BUNDLE_ID: /* same message format */
463 case MFR_CTRL_IE_LINK_ID:
464 for (idx = 0; idx < ie_len && idx < MFR_ID_STRING_MAXLEN; idx++) {
465 if (*(tptr+idx) != 0) /* don't print null termination */
466 safeputchar(*(tptr+idx));
467 else
468 break;
469 }
470 break;
471
472 case MFR_CTRL_IE_TIMESTAMP:
473 if (ie_len == sizeof(struct timeval)) {
474 ts_print((const struct timeval *)tptr);
475 break;
476 }
477 /* fall through and hexdump if no unix timestamp */
478
479 /*
480 * FIXME those are the defined IEs that lack a decoder
481 * you are welcome to contribute code ;-)
482 */
483
484 case MFR_CTRL_IE_VENDOR_EXT:
485 case MFR_CTRL_IE_CAUSE:
486
487 default:
488 if (vflag <= 1)
489 print_unknown_data(tptr,"\n\t ",ie_len);
490 break;
491 }
492
493 /* do we want to see a hexdump of the IE ? */
494 if (vflag > 1 )
495 print_unknown_data(tptr,"\n\t ",ie_len);
496
497 tlen-=ie_len;
498 tptr+=ie_len;
499 }
500 return hdr_len;
501 }
502 /*
503 * FRF.16 Fragmentation Frame
504 *
505 * 7 6 5 4 3 2 1 0
506 * +----+----+----+----+----+----+----+----+
507 * | B | E | C=0|seq. (high 4 bits) | EA |
508 * +----+----+----+----+----+----+----+----+
509 * | sequence (low 8 bits) |
510 * +----+----+----+----+----+----+----+----+
511 * | DLCI (6 bits) | CR | EA |
512 * +----+----+----+----+----+----+----+----+
513 * | DLCI (4 bits) |FECN|BECN| DE | EA |
514 * +----+----+----+----+----+----+----+----+
515 */
516
517 sequence_num = (p[0]&0x1e)<<7 | p[1];
518 /* whole packet or first fragment ? */
519 if ((p[0] & MFR_BEC_MASK) == MFR_FRAG_FRAME ||
520 (p[0] & MFR_BEC_MASK) == MFR_B_BIT) {
521 printf("FRF.16 Frag, seq %u, Flags [%s], ",
522 sequence_num,
523 bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK)));
524 hdr_len = 2;
525 fr_print(p+hdr_len,length-hdr_len);
526 return hdr_len;
527 }
528
529 /* must be a middle or the last fragment */
530 printf("FRF.16 Frag, seq %u, Flags [%s]",
531 sequence_num,
532 bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK)));
533 print_unknown_data(p,"\n\t",length);
534
535 return hdr_len;
536
537 trunc:
538 printf("[|mfr]");
539 return length;
540 }
541
542 /* an NLPID of 0xb1 indicates a 2-byte
543 * FRF.15 header
544 *
545 * 7 6 5 4 3 2 1 0
546 * +----+----+----+----+----+----+----+----+
547 * ~ Q.922 header ~
548 * +----+----+----+----+----+----+----+----+
549 * | NLPID (8 bits) | NLPID=0xb1
550 * +----+----+----+----+----+----+----+----+
551 * | B | E | C |seq. (high 4 bits) | R |
552 * +----+----+----+----+----+----+----+----+
553 * | sequence (low 8 bits) |
554 * +----+----+----+----+----+----+----+----+
555 */
556
557 #define FR_FRF15_FRAGTYPE 0x01
558
559 static void
frf15_print(const u_char * p,u_int length)560 frf15_print (const u_char *p, u_int length) {
561
562 u_int16_t sequence_num, flags;
563
564 flags = p[0]&MFR_BEC_MASK;
565 sequence_num = (p[0]&0x1e)<<7 | p[1];
566
567 printf("FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u",
568 sequence_num,
569 bittok2str(frf_flag_values,"none",flags),
570 p[0]&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End",
571 length);
572
573 /* TODO:
574 * depending on all permutations of the B, E and C bit
575 * dig as deep as we can - e.g. on the first (B) fragment
576 * there is enough payload to print the IP header
577 * on non (B) fragments it depends if the fragmentation
578 * model is end-to-end or interface based wether we want to print
579 * another Q.922 header
580 */
581
582 }
583
584 /*
585 * Q.933 decoding portion for framerelay specific.
586 */
587
588 /* Q.933 packet format
589 Format of Other Protocols
590 using Q.933 NLPID
591 +-------------------------------+
592 | Q.922 Address |
593 +---------------+---------------+
594 |Control 0x03 | NLPID 0x08 |
595 +---------------+---------------+
596 | L2 Protocol ID |
597 | octet 1 | octet 2 |
598 +-------------------------------+
599 | L3 Protocol ID |
600 | octet 2 | octet 2 |
601 +-------------------------------+
602 | Protocol Data |
603 +-------------------------------+
604 | FCS |
605 +-------------------------------+
606 */
607
608 /* L2 (Octet 1)- Call Reference Usually is 0x0 */
609
610 /*
611 * L2 (Octet 2)- Message Types definition 1 byte long.
612 */
613 /* Call Establish */
614 #define MSG_TYPE_ESC_TO_NATIONAL 0x00
615 #define MSG_TYPE_ALERT 0x01
616 #define MSG_TYPE_CALL_PROCEEDING 0x02
617 #define MSG_TYPE_CONNECT 0x07
618 #define MSG_TYPE_CONNECT_ACK 0x0F
619 #define MSG_TYPE_PROGRESS 0x03
620 #define MSG_TYPE_SETUP 0x05
621 /* Call Clear */
622 #define MSG_TYPE_DISCONNECT 0x45
623 #define MSG_TYPE_RELEASE 0x4D
624 #define MSG_TYPE_RELEASE_COMPLETE 0x5A
625 #define MSG_TYPE_RESTART 0x46
626 #define MSG_TYPE_RESTART_ACK 0x4E
627 /* Status */
628 #define MSG_TYPE_STATUS 0x7D
629 #define MSG_TYPE_STATUS_ENQ 0x75
630
631 struct tok fr_q933_msg_values[] = {
632 { MSG_TYPE_ESC_TO_NATIONAL, "ESC to National" },
633 { MSG_TYPE_ALERT, "Alert" },
634 { MSG_TYPE_CALL_PROCEEDING, "Call proceeding" },
635 { MSG_TYPE_CONNECT, "Connect" },
636 { MSG_TYPE_CONNECT_ACK, "Connect ACK" },
637 { MSG_TYPE_PROGRESS, "Progress" },
638 { MSG_TYPE_SETUP, "Setup" },
639 { MSG_TYPE_DISCONNECT, "Disconnect" },
640 { MSG_TYPE_RELEASE, "Release" },
641 { MSG_TYPE_RELEASE_COMPLETE, "Release Complete" },
642 { MSG_TYPE_RESTART, "Restart" },
643 { MSG_TYPE_RESTART_ACK, "Restart ACK" },
644 { MSG_TYPE_STATUS, "Status Reply" },
645 { MSG_TYPE_STATUS_ENQ, "Status Enquiry" },
646 { 0, NULL }
647 };
648
649 #define MSG_ANSI_LOCKING_SHIFT 0x95
650
651 #define FR_LMI_ANSI_REPORT_TYPE_IE 0x01
652 #define FR_LMI_ANSI_LINK_VERIFY_IE_91 0x19 /* details? */
653 #define FR_LMI_ANSI_LINK_VERIFY_IE 0x03
654 #define FR_LMI_ANSI_PVC_STATUS_IE 0x07
655
656 #define FR_LMI_CCITT_REPORT_TYPE_IE 0x51
657 #define FR_LMI_CCITT_LINK_VERIFY_IE 0x53
658 #define FR_LMI_CCITT_PVC_STATUS_IE 0x57
659
660 struct tok fr_q933_ie_values_codeset5[] = {
661 { FR_LMI_ANSI_REPORT_TYPE_IE, "ANSI Report Type" },
662 { FR_LMI_ANSI_LINK_VERIFY_IE_91, "ANSI Link Verify" },
663 { FR_LMI_ANSI_LINK_VERIFY_IE, "ANSI Link Verify" },
664 { FR_LMI_ANSI_PVC_STATUS_IE, "ANSI PVC Status" },
665 { FR_LMI_CCITT_REPORT_TYPE_IE, "CCITT Report Type" },
666 { FR_LMI_CCITT_LINK_VERIFY_IE, "CCITT Link Verify" },
667 { FR_LMI_CCITT_PVC_STATUS_IE, "CCITT PVC Status" },
668 { 0, NULL }
669 };
670
671 #define FR_LMI_REPORT_TYPE_IE_FULL_STATUS 0
672 #define FR_LMI_REPORT_TYPE_IE_LINK_VERIFY 1
673 #define FR_LMI_REPORT_TYPE_IE_ASYNC_PVC 2
674
675 struct tok fr_lmi_report_type_ie_values[] = {
676 { FR_LMI_REPORT_TYPE_IE_FULL_STATUS, "Full Status" },
677 { FR_LMI_REPORT_TYPE_IE_LINK_VERIFY, "Link verify" },
678 { FR_LMI_REPORT_TYPE_IE_ASYNC_PVC, "Async PVC Status" },
679 { 0, NULL }
680 };
681
682 /* array of 16 codepages - currently we only support codepage 1,5 */
683 static struct tok *fr_q933_ie_codesets[] = {
684 NULL,
685 fr_q933_ie_values_codeset5,
686 NULL,
687 NULL,
688 NULL,
689 fr_q933_ie_values_codeset5,
690 NULL,
691 NULL,
692 NULL,
693 NULL,
694 NULL,
695 NULL,
696 NULL,
697 NULL,
698 NULL,
699 NULL
700 };
701
702 static int fr_q933_print_ie_codeset5(const struct ie_tlv_header_t *ie_p,
703 const u_char *p);
704
705 typedef int (*codeset_pr_func_t)(const struct ie_tlv_header_t *ie_p,
706 const u_char *p);
707
708 /* array of 16 codepages - currently we only support codepage 1,5 */
709 static codeset_pr_func_t fr_q933_print_ie_codeset[] = {
710 NULL,
711 fr_q933_print_ie_codeset5,
712 NULL,
713 NULL,
714 NULL,
715 fr_q933_print_ie_codeset5,
716 NULL,
717 NULL,
718 NULL,
719 NULL,
720 NULL,
721 NULL,
722 NULL,
723 NULL,
724 NULL,
725 NULL
726 };
727
728 void
q933_print(const u_char * p,u_int length)729 q933_print(const u_char *p, u_int length)
730 {
731 const u_char *ptemp = p;
732 struct ie_tlv_header_t *ie_p;
733 int olen;
734 int is_ansi = 0;
735 u_int codeset;
736 u_int ie_is_known = 0;
737
738 if (length < 9) { /* shortest: Q.933a LINK VERIFY */
739 printf("[|q.933]");
740 return;
741 }
742
743 codeset = p[2]&0x0f; /* extract the codeset */
744
745 if (p[2] == MSG_ANSI_LOCKING_SHIFT) {
746 is_ansi = 1;
747 }
748
749 printf("%s", eflag ? "" : "Q.933, ");
750
751 /* printing out header part */
752 printf("%s, codeset %u", is_ansi ? "ANSI" : "CCITT", codeset);
753
754 if (p[0]) {
755 printf(", Call Ref: 0x%02x", p[0]);
756 }
757 if (vflag) {
758 printf(", %s (0x%02x), length %u",
759 tok2str(fr_q933_msg_values,
760 "unknown message", p[1]),
761 p[1],
762 length);
763 } else {
764 printf(", %s",
765 tok2str(fr_q933_msg_values,
766 "unknown message 0x%02x", p[1]));
767 }
768
769 olen = length; /* preserve the original length for non verbose mode */
770
771 if (length < (u_int)(2 - is_ansi)) {
772 printf("[|q.933]");
773 return;
774 }
775 length -= 2 + is_ansi;
776 ptemp += 2 + is_ansi;
777
778 /* Loop through the rest of IE */
779 while (length > sizeof(struct ie_tlv_header_t)) {
780 ie_p = (struct ie_tlv_header_t *)ptemp;
781 if (length < sizeof(struct ie_tlv_header_t) ||
782 length < sizeof(struct ie_tlv_header_t) + ie_p->ie_len) {
783 if (vflag) { /* not bark if there is just a trailer */
784 printf("\n[|q.933]");
785 } else {
786 printf(", length %u",olen);
787 }
788 return;
789 }
790
791 /* lets do the full IE parsing only in verbose mode
792 * however some IEs (DLCI Status, Link Verify)
793 * are also interestting in non-verbose mode */
794 if (vflag) {
795 printf("\n\t%s IE (0x%02x), length %u: ",
796 tok2str(fr_q933_ie_codesets[codeset],
797 "unknown", ie_p->ie_type),
798 ie_p->ie_type,
799 ie_p->ie_len);
800 }
801
802 /* sanity check */
803 if (ie_p->ie_type == 0 || ie_p->ie_len == 0) {
804 return;
805 }
806
807 if (fr_q933_print_ie_codeset[codeset] != NULL) {
808 ie_is_known = fr_q933_print_ie_codeset[codeset](ie_p, ptemp);
809 }
810
811 if (vflag >= 1 && !ie_is_known) {
812 print_unknown_data(ptemp+2,"\n\t",ie_p->ie_len);
813 }
814
815 /* do we want to see a hexdump of the IE ? */
816 if (vflag> 1 && ie_is_known) {
817 print_unknown_data(ptemp+2,"\n\t ",ie_p->ie_len);
818 }
819
820 length = length - ie_p->ie_len - 2;
821 ptemp = ptemp + ie_p->ie_len + 2;
822 }
823 if (!vflag) {
824 printf(", length %u",olen);
825 }
826 }
827
828 static int
fr_q933_print_ie_codeset5(const struct ie_tlv_header_t * ie_p,const u_char * p)829 fr_q933_print_ie_codeset5(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 (vflag) {
838 printf("%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 (!vflag) {
848 printf(", ");
849 }
850 printf("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 (!vflag) {
856 printf(", ");
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 printf("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 printf("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