2 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996
3 * The Regents of the University of California. All rights reserved.
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
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.
22 /* \summary: Frame Relay printer */
28 #include <netdissect-stdinc.h>
33 #include "netdissect.h"
34 #include "addrtoname.h"
35 #include "ethertype.h"
41 static void frf15_print(netdissect_options *ndo, const u_char *, u_int);
44 * the frame relay header has a variable length
46 * the EA bit determines if there is another byte
49 * minimum header length is 2 bytes
50 * maximum header length is 4 bytes
53 * +----+----+----+----+----+----+----+----+
54 * | DLCI (6 bits) | CR | EA |
55 * +----+----+----+----+----+----+----+----+
56 * | DLCI (4 bits) |FECN|BECN| DE | EA |
57 * +----+----+----+----+----+----+----+----+
58 * | DLCI (7 bits) | EA |
59 * +----+----+----+----+----+----+----+----+
60 * | DLCI (6 bits) |SDLC| EA |
61 * +----+----+----+----+----+----+----+----+
64 #define FR_EA_BIT 0x01
66 #define FR_CR_BIT 0x02000000
67 #define FR_DE_BIT 0x00020000
68 #define FR_BECN_BIT 0x00040000
69 #define FR_FECN_BIT 0x00080000
70 #define FR_SDLC_BIT 0x00000002
73 static const struct tok fr_header_flag_values[] = {
76 { FR_BECN_BIT, "BECN" },
77 { FR_FECN_BIT, "FECN" },
78 { FR_SDLC_BIT, "sdlcore" },
83 #define MFR_B_BIT 0x80
84 #define MFR_E_BIT 0x40
85 #define MFR_C_BIT 0x20
86 #define MFR_BEC_MASK (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT)
87 #define MFR_CTRL_FRAME (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT)
88 #define MFR_FRAG_FRAME (MFR_B_BIT | MFR_E_BIT )
90 static const struct tok frf_flag_values[] = {
91 { MFR_B_BIT, "Begin" },
93 { MFR_C_BIT, "Control" },
97 /* Finds out Q.922 address length, DLCI and flags. Returns 1 on success,
98 * 0 on invalid address, -1 on truncated packet
99 * save the flags dep. on address length
101 static int parse_q922_addr(netdissect_options *ndo,
102 const u_char *p, u_int *dlci,
103 u_int *addr_len, uint8_t *flags, u_int length)
105 if (!ND_TTEST(p[0]) || length < 1)
107 if ((p[0] & FR_EA_BIT))
110 if (!ND_TTEST(p[1]) || length < 2)
113 *dlci = ((p[0] & 0xFC) << 2) | ((p[1] & 0xF0) >> 4);
115 flags[0] = p[0] & 0x02; /* populate the first flag fields */
116 flags[1] = p[1] & 0x0c;
117 flags[2] = 0; /* clear the rest of the flags */
120 if (p[1] & FR_EA_BIT)
121 return 1; /* 2-byte Q.922 address */
125 if (!ND_TTEST(p[0]) || length < 1)
127 (*addr_len)++; /* 3- or 4-byte Q.922 address */
128 if ((p[0] & FR_EA_BIT) == 0) {
129 *dlci = (*dlci << 7) | (p[0] >> 1);
130 (*addr_len)++; /* 4-byte Q.922 address */
135 if (!ND_TTEST(p[0]) || length < 1)
137 if ((p[0] & FR_EA_BIT) == 0)
138 return 0; /* more than 4 bytes of Q.922 address? */
140 flags[3] = p[0] & 0x02;
142 *dlci = (*dlci << 6) | (p[0] >> 2);
148 q922_string(netdissect_options *ndo, const u_char *p, u_int length)
151 static u_int dlci, addr_len;
152 static uint8_t flags[4];
153 static char buffer[sizeof("DLCI xxxxxxxxxx")];
154 memset(buffer, 0, sizeof(buffer));
156 if (parse_q922_addr(ndo, p, &dlci, &addr_len, flags, length) == 1){
157 snprintf(buffer, sizeof(buffer), "DLCI %u", dlci);
164 /* Frame Relay packet structure, with flags and CRC removed
166 +---------------------------+
170 +---------------------------+
171 | Control (UI = 0x03) |
172 +---------------------------+
173 | Optional Pad (0x00) |
174 +---------------------------+
176 +---------------------------+
183 +---------------------------+
185 * Q.922 addresses, as presently defined, are two octets and
186 contain a 10-bit DLCI. In some networks Q.922 addresses
187 may optionally be increased to three or four octets.
191 fr_hdr_print(netdissect_options *ndo,
192 int length, u_int addr_len, u_int dlci, uint8_t *flags, uint16_t nlpid)
194 if (ndo->ndo_qflag) {
195 ND_PRINT((ndo, "Q.922, DLCI %u, length %u: ",
199 if (nlpid <= 0xff) /* if its smaller than 256 then its a NLPID */
200 ND_PRINT((ndo, "Q.922, hdr-len %u, DLCI %u, Flags [%s], NLPID %s (0x%02x), length %u: ",
203 bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
204 tok2str(nlpid_values,"unknown", nlpid),
207 else /* must be an ethertype */
208 ND_PRINT((ndo, "Q.922, hdr-len %u, DLCI %u, Flags [%s], cisco-ethertype %s (0x%04x), length %u: ",
211 bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
212 tok2str(ethertype_values, "unknown", nlpid),
219 fr_if_print(netdissect_options *ndo,
220 const struct pcap_pkthdr *h, register const u_char *p)
222 register u_int length = h->len;
223 register u_int caplen = h->caplen;
225 ND_TCHECK2(*p, 4); /* minimum frame header length */
227 if ((length = fr_print(ndo, p, length)) == 0)
232 ND_PRINT((ndo, "[|fr]"));
237 fr_print(netdissect_options *ndo,
238 register const u_char *p, u_int length)
241 uint16_t extracted_ethertype;
248 ret = parse_q922_addr(ndo, p, &dlci, &addr_len, flags, length);
252 ND_PRINT((ndo, "Q.922, invalid address"));
256 ND_TCHECK(p[addr_len]);
257 if (length < addr_len + 1)
260 if (p[addr_len] != LLC_UI && dlci != 0) {
262 * Let's figure out if we have Cisco-style encapsulation,
263 * with an Ethernet type (Cisco HDLC type?) following the
266 if (!ND_TTEST2(p[addr_len], 2) || length < addr_len + 2) {
268 ND_PRINT((ndo, "UI %02x! ", p[addr_len]));
270 extracted_ethertype = EXTRACT_16BITS(p+addr_len);
273 fr_hdr_print(ndo, length, addr_len, dlci,
274 flags, extracted_ethertype);
276 if (ethertype_print(ndo, extracted_ethertype,
277 p+addr_len+ETHERTYPE_LEN,
278 length-addr_len-ETHERTYPE_LEN,
279 ndo->ndo_snapend-p-addr_len-ETHERTYPE_LEN,
281 /* ether_type not known, probably it wasn't one */
282 ND_PRINT((ndo, "UI %02x! ", p[addr_len]));
288 ND_TCHECK(p[addr_len+1]);
289 if (length < addr_len + 2)
292 if (p[addr_len + 1] == 0) {
294 * Assume a pad byte after the control (UI) byte.
295 * A pad byte should only be used with 3-byte Q.922.
298 ND_PRINT((ndo, "Pad! "));
299 hdr_len = addr_len + 1 /* UI */ + 1 /* pad */ + 1 /* NLPID */;
303 * A pad byte should be used with 3-byte Q.922.
306 ND_PRINT((ndo, "No pad! "));
307 hdr_len = addr_len + 1 /* UI */ + 1 /* NLPID */;
310 ND_TCHECK(p[hdr_len - 1]);
311 if (length < hdr_len)
313 nlpid = p[hdr_len - 1];
316 fr_hdr_print(ndo, length, addr_len, dlci, flags, nlpid);
322 ip_print(ndo, p, length);
326 ip6_print(ndo, p, length);
332 isoclns_print(ndo, p - 1, length + 1); /* OSI printers need the NLPID field */
336 if (snap_print(ndo, p, length, ndo->ndo_snapend - p, NULL, NULL, 0) == 0) {
337 /* ether_type not known, print raw packet */
339 fr_hdr_print(ndo, length + hdr_len, hdr_len,
341 if (!ndo->ndo_suppress_default_print)
342 ND_DEFAULTPRINT(p - hdr_len, length + hdr_len);
347 q933_print(ndo, p, length);
351 frf15_print(ndo, p, length);
355 ppp_print(ndo, p, length);
360 fr_hdr_print(ndo, length + hdr_len, addr_len,
363 ND_DEFAULTPRINT(p, length);
369 ND_PRINT((ndo, "[|fr]"));
375 mfr_if_print(netdissect_options *ndo,
376 const struct pcap_pkthdr *h, register const u_char *p)
378 register u_int length = h->len;
379 register u_int caplen = h->caplen;
381 ND_TCHECK2(*p, 2); /* minimum frame header length */
383 if ((length = mfr_print(ndo, p, length)) == 0)
388 ND_PRINT((ndo, "[|mfr]"));
393 #define MFR_CTRL_MSG_ADD_LINK 1
394 #define MFR_CTRL_MSG_ADD_LINK_ACK 2
395 #define MFR_CTRL_MSG_ADD_LINK_REJ 3
396 #define MFR_CTRL_MSG_HELLO 4
397 #define MFR_CTRL_MSG_HELLO_ACK 5
398 #define MFR_CTRL_MSG_REMOVE_LINK 6
399 #define MFR_CTRL_MSG_REMOVE_LINK_ACK 7
401 static const struct tok mfr_ctrl_msg_values[] = {
402 { MFR_CTRL_MSG_ADD_LINK, "Add Link" },
403 { MFR_CTRL_MSG_ADD_LINK_ACK, "Add Link ACK" },
404 { MFR_CTRL_MSG_ADD_LINK_REJ, "Add Link Reject" },
405 { MFR_CTRL_MSG_HELLO, "Hello" },
406 { MFR_CTRL_MSG_HELLO_ACK, "Hello ACK" },
407 { MFR_CTRL_MSG_REMOVE_LINK, "Remove Link" },
408 { MFR_CTRL_MSG_REMOVE_LINK_ACK, "Remove Link ACK" },
412 #define MFR_CTRL_IE_BUNDLE_ID 1
413 #define MFR_CTRL_IE_LINK_ID 2
414 #define MFR_CTRL_IE_MAGIC_NUM 3
415 #define MFR_CTRL_IE_TIMESTAMP 5
416 #define MFR_CTRL_IE_VENDOR_EXT 6
417 #define MFR_CTRL_IE_CAUSE 7
419 static const struct tok mfr_ctrl_ie_values[] = {
420 { MFR_CTRL_IE_BUNDLE_ID, "Bundle ID"},
421 { MFR_CTRL_IE_LINK_ID, "Link ID"},
422 { MFR_CTRL_IE_MAGIC_NUM, "Magic Number"},
423 { MFR_CTRL_IE_TIMESTAMP, "Timestamp"},
424 { MFR_CTRL_IE_VENDOR_EXT, "Vendor Extension"},
425 { MFR_CTRL_IE_CAUSE, "Cause"},
429 #define MFR_ID_STRING_MAXLEN 50
431 struct ie_tlv_header_t {
437 mfr_print(netdissect_options *ndo,
438 register const u_char *p, u_int length)
440 u_int tlen,idx,hdr_len = 0;
441 uint16_t sequence_num;
442 uint8_t ie_type,ie_len;
447 * FRF.16 Link Integrity Control Frame
450 * +----+----+----+----+----+----+----+----+
451 * | B | E | C=1| 0 0 0 0 | EA |
452 * +----+----+----+----+----+----+----+----+
453 * | 0 0 0 0 0 0 0 0 |
454 * +----+----+----+----+----+----+----+----+
456 * +----+----+----+----+----+----+----+----+
459 ND_TCHECK2(*p, 4); /* minimum frame header length */
461 ND_PRINT((ndo, "Message too short (%u bytes)", length));
465 if ((p[0] & MFR_BEC_MASK) == MFR_CTRL_FRAME && p[1] == 0) {
466 ND_PRINT((ndo, "FRF.16 Control, Flags [%s], %s, length %u",
467 bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK)),
468 tok2str(mfr_ctrl_msg_values,"Unknown Message (0x%02x)",p[2]),
477 while (tlen>sizeof(struct ie_tlv_header_t)) {
478 ND_TCHECK2(*tptr, sizeof(struct ie_tlv_header_t));
482 ND_PRINT((ndo, "\n\tIE %s (%u), length %u: ",
483 tok2str(mfr_ctrl_ie_values,"Unknown",ie_type),
487 /* infinite loop check */
488 if (ie_type == 0 || ie_len <= sizeof(struct ie_tlv_header_t))
491 ND_TCHECK2(*tptr, ie_len);
492 tptr+=sizeof(struct ie_tlv_header_t);
493 /* tlv len includes header */
494 ie_len-=sizeof(struct ie_tlv_header_t);
495 tlen-=sizeof(struct ie_tlv_header_t);
499 case MFR_CTRL_IE_MAGIC_NUM:
500 /* FRF.16.1 Section 3.4.3 Magic Number Information Element */
502 ND_PRINT((ndo, "(invalid length)"));
505 ND_PRINT((ndo, "0x%08x", EXTRACT_32BITS(tptr)));
508 case MFR_CTRL_IE_BUNDLE_ID: /* same message format */
509 case MFR_CTRL_IE_LINK_ID:
510 for (idx = 0; idx < ie_len && idx < MFR_ID_STRING_MAXLEN; idx++) {
511 if (*(tptr+idx) != 0) /* don't print null termination */
512 safeputchar(ndo, *(tptr + idx));
518 case MFR_CTRL_IE_TIMESTAMP:
519 if (ie_len == sizeof(struct timeval)) {
520 ts_print(ndo, (const struct timeval *)tptr);
523 /* fall through and hexdump if no unix timestamp */
526 * FIXME those are the defined IEs that lack a decoder
527 * you are welcome to contribute code ;-)
530 case MFR_CTRL_IE_VENDOR_EXT:
531 case MFR_CTRL_IE_CAUSE:
534 if (ndo->ndo_vflag <= 1)
535 print_unknown_data(ndo, tptr, "\n\t ", ie_len);
539 /* do we want to see a hexdump of the IE ? */
540 if (ndo->ndo_vflag > 1 )
541 print_unknown_data(ndo, tptr, "\n\t ", ie_len);
549 * FRF.16 Fragmentation Frame
552 * +----+----+----+----+----+----+----+----+
553 * | B | E | C=0|seq. (high 4 bits) | EA |
554 * +----+----+----+----+----+----+----+----+
555 * | sequence (low 8 bits) |
556 * +----+----+----+----+----+----+----+----+
557 * | DLCI (6 bits) | CR | EA |
558 * +----+----+----+----+----+----+----+----+
559 * | DLCI (4 bits) |FECN|BECN| DE | EA |
560 * +----+----+----+----+----+----+----+----+
563 sequence_num = (p[0]&0x1e)<<7 | p[1];
564 /* whole packet or first fragment ? */
565 if ((p[0] & MFR_BEC_MASK) == MFR_FRAG_FRAME ||
566 (p[0] & MFR_BEC_MASK) == MFR_B_BIT) {
567 ND_PRINT((ndo, "FRF.16 Frag, seq %u, Flags [%s], ",
569 bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK))));
571 fr_print(ndo, p+hdr_len,length-hdr_len);
575 /* must be a middle or the last fragment */
576 ND_PRINT((ndo, "FRF.16 Frag, seq %u, Flags [%s]",
578 bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK))));
579 print_unknown_data(ndo, p, "\n\t", length);
584 ND_PRINT((ndo, "[|mfr]"));
588 /* an NLPID of 0xb1 indicates a 2-byte
592 * +----+----+----+----+----+----+----+----+
594 * +----+----+----+----+----+----+----+----+
595 * | NLPID (8 bits) | NLPID=0xb1
596 * +----+----+----+----+----+----+----+----+
597 * | B | E | C |seq. (high 4 bits) | R |
598 * +----+----+----+----+----+----+----+----+
599 * | sequence (low 8 bits) |
600 * +----+----+----+----+----+----+----+----+
603 #define FR_FRF15_FRAGTYPE 0x01
606 frf15_print(netdissect_options *ndo,
607 const u_char *p, u_int length)
609 uint16_t sequence_num, flags;
615 flags = p[0]&MFR_BEC_MASK;
616 sequence_num = (p[0]&0x1e)<<7 | p[1];
618 ND_PRINT((ndo, "FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u",
620 bittok2str(frf_flag_values,"none",flags),
621 p[0]&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End",
625 * depending on all permutations of the B, E and C bit
626 * dig as deep as we can - e.g. on the first (B) fragment
627 * there is enough payload to print the IP header
628 * on non (B) fragments it depends if the fragmentation
629 * model is end-to-end or interface based wether we want to print
630 * another Q.922 header
635 ND_PRINT((ndo, "[|frf.15]"));
639 * Q.933 decoding portion for framerelay specific.
642 /* Q.933 packet format
643 Format of Other Protocols
645 +-------------------------------+
647 +---------------+---------------+
648 |Control 0x03 | NLPID 0x08 |
649 +---------------+---------------+
651 | octet 1 | octet 2 |
652 +-------------------------------+
654 | octet 2 | octet 2 |
655 +-------------------------------+
657 +-------------------------------+
659 +-------------------------------+
662 /* L2 (Octet 1)- Call Reference Usually is 0x0 */
665 * L2 (Octet 2)- Message Types definition 1 byte long.
668 #define MSG_TYPE_ESC_TO_NATIONAL 0x00
669 #define MSG_TYPE_ALERT 0x01
670 #define MSG_TYPE_CALL_PROCEEDING 0x02
671 #define MSG_TYPE_CONNECT 0x07
672 #define MSG_TYPE_CONNECT_ACK 0x0F
673 #define MSG_TYPE_PROGRESS 0x03
674 #define MSG_TYPE_SETUP 0x05
676 #define MSG_TYPE_DISCONNECT 0x45
677 #define MSG_TYPE_RELEASE 0x4D
678 #define MSG_TYPE_RELEASE_COMPLETE 0x5A
679 #define MSG_TYPE_RESTART 0x46
680 #define MSG_TYPE_RESTART_ACK 0x4E
682 #define MSG_TYPE_STATUS 0x7D
683 #define MSG_TYPE_STATUS_ENQ 0x75
685 static const struct tok fr_q933_msg_values[] = {
686 { MSG_TYPE_ESC_TO_NATIONAL, "ESC to National" },
687 { MSG_TYPE_ALERT, "Alert" },
688 { MSG_TYPE_CALL_PROCEEDING, "Call proceeding" },
689 { MSG_TYPE_CONNECT, "Connect" },
690 { MSG_TYPE_CONNECT_ACK, "Connect ACK" },
691 { MSG_TYPE_PROGRESS, "Progress" },
692 { MSG_TYPE_SETUP, "Setup" },
693 { MSG_TYPE_DISCONNECT, "Disconnect" },
694 { MSG_TYPE_RELEASE, "Release" },
695 { MSG_TYPE_RELEASE_COMPLETE, "Release Complete" },
696 { MSG_TYPE_RESTART, "Restart" },
697 { MSG_TYPE_RESTART_ACK, "Restart ACK" },
698 { MSG_TYPE_STATUS, "Status Reply" },
699 { MSG_TYPE_STATUS_ENQ, "Status Enquiry" },
703 #define IE_IS_SINGLE_OCTET(iecode) ((iecode) & 0x80)
704 #define IE_IS_SHIFT(iecode) (((iecode) & 0xF0) == 0x90)
705 #define IE_SHIFT_IS_NON_LOCKING(iecode) ((iecode) & 0x08)
706 #define IE_SHIFT_IS_LOCKING(iecode) (!(IE_SHIFT_IS_NON_LOCKING(iecode)))
707 #define IE_SHIFT_CODESET(iecode) ((iecode) & 0x07)
709 #define FR_LMI_ANSI_REPORT_TYPE_IE 0x01
710 #define FR_LMI_ANSI_LINK_VERIFY_IE_91 0x19 /* details? */
711 #define FR_LMI_ANSI_LINK_VERIFY_IE 0x03
712 #define FR_LMI_ANSI_PVC_STATUS_IE 0x07
714 #define FR_LMI_CCITT_REPORT_TYPE_IE 0x51
715 #define FR_LMI_CCITT_LINK_VERIFY_IE 0x53
716 #define FR_LMI_CCITT_PVC_STATUS_IE 0x57
718 static const struct tok fr_q933_ie_values_codeset_0_5[] = {
719 { FR_LMI_ANSI_REPORT_TYPE_IE, "ANSI Report Type" },
720 { FR_LMI_ANSI_LINK_VERIFY_IE_91, "ANSI Link Verify" },
721 { FR_LMI_ANSI_LINK_VERIFY_IE, "ANSI Link Verify" },
722 { FR_LMI_ANSI_PVC_STATUS_IE, "ANSI PVC Status" },
723 { FR_LMI_CCITT_REPORT_TYPE_IE, "CCITT Report Type" },
724 { FR_LMI_CCITT_LINK_VERIFY_IE, "CCITT Link Verify" },
725 { FR_LMI_CCITT_PVC_STATUS_IE, "CCITT PVC Status" },
729 #define FR_LMI_REPORT_TYPE_IE_FULL_STATUS 0
730 #define FR_LMI_REPORT_TYPE_IE_LINK_VERIFY 1
731 #define FR_LMI_REPORT_TYPE_IE_ASYNC_PVC 2
733 static const struct tok fr_lmi_report_type_ie_values[] = {
734 { FR_LMI_REPORT_TYPE_IE_FULL_STATUS, "Full Status" },
735 { FR_LMI_REPORT_TYPE_IE_LINK_VERIFY, "Link verify" },
736 { FR_LMI_REPORT_TYPE_IE_ASYNC_PVC, "Async PVC Status" },
740 /* array of 16 codesets - currently we only support codepage 0 and 5 */
741 static const struct tok *fr_q933_ie_codesets[] = {
742 fr_q933_ie_values_codeset_0_5,
747 fr_q933_ie_values_codeset_0_5,
760 static int fr_q933_print_ie_codeset_0_5(netdissect_options *ndo, u_int iecode,
761 u_int ielength, const u_char *p);
763 typedef int (*codeset_pr_func_t)(netdissect_options *, u_int iecode,
764 u_int ielength, const u_char *p);
766 /* array of 16 codesets - currently we only support codepage 0 and 5 */
767 static const codeset_pr_func_t fr_q933_print_ie_codeset[] = {
768 fr_q933_print_ie_codeset_0_5,
773 fr_q933_print_ie_codeset_0_5,
789 * p points to octet 2, the octet containing the length of the
790 * call reference value, so p[n] is octet n+2 ("octet X" is as
791 * used in Q.931/Q.933).
793 * XXX - actually used both for Q.931 and Q.933.
796 q933_print(netdissect_options *ndo,
797 const u_char *p, u_int length)
800 u_int call_ref_length, i;
801 uint8_t call_ref[15]; /* maximum length - length field is 4 bits */
808 u_int non_locking_shift;
809 u_int unshift_codeset;
811 ND_PRINT((ndo, "%s", ndo->ndo_eflag ? "" : "Q.933"));
813 if (length == 0 || !ND_TTEST(*p)) {
815 ND_PRINT((ndo, ", "));
816 ND_PRINT((ndo, "length %u", length));
821 * Get the length of the call reference value.
823 olen = length; /* preserve the original length for display */
824 call_ref_length = (*p) & 0x0f;
829 * Get the call reference value.
831 for (i = 0; i < call_ref_length; i++) {
832 if (length == 0 || !ND_TTEST(*p)) {
834 ND_PRINT((ndo, ", "));
835 ND_PRINT((ndo, "length %u", olen));
844 * Get the message type.
846 if (length == 0 || !ND_TTEST(*p)) {
848 ND_PRINT((ndo, ", "));
849 ND_PRINT((ndo, "length %u", olen));
857 * Peek ahead to see if we start with a shift.
859 non_locking_shift = 0;
860 unshift_codeset = codeset;
864 ND_PRINT((ndo, ", "));
865 ND_PRINT((ndo, "length %u", olen));
869 if (IE_IS_SHIFT(iecode)) {
871 * It's a shift. Skip over it.
879 codeset = IE_SHIFT_CODESET(iecode);
882 * If it's a locking shift to codeset 5,
883 * mark this as ANSI. (XXX - 5 is actually
884 * for national variants in general, not
885 * the US variant in particular, but maybe
886 * this is more American exceptionalism. :-))
888 if (IE_SHIFT_IS_LOCKING(iecode)) {
890 * It's a locking shift.
894 * It's a locking shift to
895 * codeset 5, so this is
902 * It's a non-locking shift.
903 * Remember the current codeset, so we
904 * can revert to it after the next IE.
906 non_locking_shift = 1;
912 /* printing out header part */
914 ND_PRINT((ndo, ", "));
915 ND_PRINT((ndo, "%s, codeset %u", is_ansi ? "ANSI" : "CCITT", codeset));
917 if (call_ref_length != 0) {
919 if (call_ref_length > 1 || p[0] != 0) {
921 * Not a dummy call reference.
923 ND_PRINT((ndo, ", Call Ref: 0x"));
924 for (i = 0; i < call_ref_length; i++)
925 ND_PRINT((ndo, "%02x", call_ref[i]));
928 if (ndo->ndo_vflag) {
929 ND_PRINT((ndo, ", %s (0x%02x), length %u",
930 tok2str(fr_q933_msg_values,
931 "unknown message", msgtype),
935 ND_PRINT((ndo, ", %s",
936 tok2str(fr_q933_msg_values,
937 "unknown message 0x%02x", msgtype)));
940 /* Loop through the rest of the IEs */
941 while (length != 0) {
943 * What's the state of any non-locking shifts?
945 if (non_locking_shift == 1) {
947 * There's a non-locking shift in effect for
948 * this IE. Count it, so we reset the codeset
949 * before the next IE.
951 non_locking_shift = 2;
952 } else if (non_locking_shift == 2) {
956 codeset = unshift_codeset;
957 non_locking_shift = 0;
961 * Get the first octet of the IE.
964 if (!ndo->ndo_vflag) {
965 ND_PRINT((ndo, ", length %u", olen));
973 /* Single-octet IE? */
974 if (IE_IS_SINGLE_OCTET(iecode)) {
976 * Yes. Is it a shift?
978 if (IE_IS_SHIFT(iecode)) {
980 * Yes. Is it locking?
982 if (IE_SHIFT_IS_LOCKING(iecode)) {
986 non_locking_shift = 0;
989 * No. Remember the current
990 * codeset, so we can revert
991 * to it after the next IE.
993 non_locking_shift = 1;
994 unshift_codeset = codeset;
1000 codeset = IE_SHIFT_CODESET(iecode);
1004 * No. Get the IE length.
1006 if (length == 0 || !ND_TTEST(*p)) {
1007 if (!ndo->ndo_vflag) {
1008 ND_PRINT((ndo, ", length %u", olen));
1016 /* lets do the full IE parsing only in verbose mode
1017 * however some IEs (DLCI Status, Link Verify)
1018 * are also interesting in non-verbose mode */
1019 if (ndo->ndo_vflag) {
1020 ND_PRINT((ndo, "\n\t%s IE (0x%02x), length %u: ",
1021 tok2str(fr_q933_ie_codesets[codeset],
1028 if (iecode == 0 || ielength == 0) {
1031 if (length < ielength || !ND_TTEST2(*p, ielength)) {
1032 if (!ndo->ndo_vflag) {
1033 ND_PRINT((ndo, ", length %u", olen));
1039 if (fr_q933_print_ie_codeset[codeset] != NULL) {
1040 ie_is_known = fr_q933_print_ie_codeset[codeset](ndo, iecode, ielength, p);
1045 * Known IE; do we want to see a hexdump
1048 if (ndo->ndo_vflag > 1) {
1050 print_unknown_data(ndo, p, "\n\t ", ielength);
1054 * Unknown IE; if we're printing verbosely,
1055 * print its content in hex.
1057 if (ndo->ndo_vflag >= 1) {
1058 print_unknown_data(ndo, p, "\n\t", ielength);
1066 if (!ndo->ndo_vflag) {
1067 ND_PRINT((ndo, ", length %u", olen));
1072 ND_PRINT((ndo, "[|q.933]"));
1076 fr_q933_print_ie_codeset_0_5(netdissect_options *ndo, u_int iecode,
1077 u_int ielength, const u_char *p)
1083 case FR_LMI_ANSI_REPORT_TYPE_IE: /* fall through */
1084 case FR_LMI_CCITT_REPORT_TYPE_IE:
1086 if (!ndo->ndo_vflag) {
1087 ND_PRINT((ndo, ", "));
1089 ND_PRINT((ndo, "Invalid REPORT TYPE IE"));
1092 if (ndo->ndo_vflag) {
1093 ND_PRINT((ndo, "%s (%u)",
1094 tok2str(fr_lmi_report_type_ie_values,"unknown",p[0]),
1099 case FR_LMI_ANSI_LINK_VERIFY_IE: /* fall through */
1100 case FR_LMI_CCITT_LINK_VERIFY_IE:
1101 case FR_LMI_ANSI_LINK_VERIFY_IE_91:
1102 if (!ndo->ndo_vflag) {
1103 ND_PRINT((ndo, ", "));
1106 ND_PRINT((ndo, "Invalid LINK VERIFY IE"));
1109 ND_PRINT((ndo, "TX Seq: %3d, RX Seq: %3d", p[0], p[1]));
1112 case FR_LMI_ANSI_PVC_STATUS_IE: /* fall through */
1113 case FR_LMI_CCITT_PVC_STATUS_IE:
1114 if (!ndo->ndo_vflag) {
1115 ND_PRINT((ndo, ", "));
1117 /* now parse the DLCI information element. */
1118 if ((ielength < 3) ||
1120 ((ielength == 3) && !(p[1] & 0x80)) ||
1121 ((ielength == 4) && ((p[1] & 0x80) || !(p[2] & 0x80))) ||
1122 ((ielength == 5) && ((p[1] & 0x80) || (p[2] & 0x80) ||
1125 !(p[ielength - 1] & 0x80)) {
1126 ND_PRINT((ndo, "Invalid DLCI in PVC STATUS IE"));
1130 dlci = ((p[0] & 0x3F) << 4) | ((p[1] & 0x78) >> 3);
1131 if (ielength == 4) {
1132 dlci = (dlci << 6) | ((p[2] & 0x7E) >> 1);
1134 else if (ielength == 5) {
1135 dlci = (dlci << 13) | (p[2] & 0x7F) | ((p[3] & 0x7E) >> 1);
1138 ND_PRINT((ndo, "DLCI %u: status %s%s", dlci,
1139 p[ielength - 1] & 0x8 ? "New, " : "",
1140 p[ielength - 1] & 0x2 ? "Active" : "Inactive"));
1148 * c-style: whitesmith