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.
25 static const char rcsid[] _U_ =
26 "@(#)$Header: /tcpdump/master/tcpdump/print-fr.c,v 1.32.2.12 2005/08/23 03:15:51 guy Exp $ (LBL)";
33 #include <tcpdump-stdinc.h>
39 #include "addrtoname.h"
40 #include "interface.h"
41 #include "ethertype.h"
46 static void frf15_print(const u_char *, u_int);
49 * the frame relay header has a variable length
51 * the EA bit determines if there is another byte
54 * minimum header length is 2 bytes
55 * maximum header length is 4 bytes
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 * +----+----+----+----+----+----+----+----+
69 #define FR_EA_BIT 0x01
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
78 struct tok fr_header_flag_values[] = {
81 { FR_BECN_BIT, "BECN" },
82 { FR_FECN_BIT, "FECN" },
83 { FR_SDLC_BIT, "sdlcore" },
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 )
95 struct tok frf_flag_values[] = {
96 { MFR_B_BIT, "Begin" },
98 { MFR_C_BIT, "Control" },
102 /* Finds out Q.922 address length, DLCI and flags. Returns 0 on success
103 * save the flags dep. on address length
105 static int parse_q922_addr(const u_char *p, u_int *dlci, u_int *sdlcore,
106 u_int *addr_len, u_int8_t *flags)
108 if ((p[0] & FR_EA_BIT))
112 *dlci = ((p[0] & 0xFC) << 2) | ((p[1] & 0xF0) >> 4);
114 flags[0] = p[0] & 0x02; /* populate the first flag fields */
115 flags[1] = p[1] & 0x0c;
117 if (p[1] & FR_EA_BIT)
118 return 0; /* 2-byte Q.922 address */
121 (*addr_len)++; /* 3- or 4-byte Q.922 address */
122 if ((p[0] & FR_EA_BIT) == 0) {
123 *dlci = (*dlci << 7) | (p[0] >> 1);
124 (*addr_len)++; /* 4-byte Q.922 address */
128 if ((p[0] & FR_EA_BIT) == 0)
129 return -1; /* more than 4 bytes of Q.922 address? */
131 flags[3] = p[0] & 0x02;
134 *sdlcore = p[0] >> 2;
136 *dlci = (*dlci << 6) | (p[0] >> 2);
141 /* Frame Relay packet structure, with flags and CRC removed
143 +---------------------------+
147 +---------------------------+
148 | Control (UI = 0x03) |
149 +---------------------------+
150 | Optional Pad (0x00) |
151 +---------------------------+
153 +---------------------------+
160 +---------------------------+
162 * Q.922 addresses, as presently defined, are two octets and
163 contain a 10-bit DLCI. In some networks Q.922 addresses
164 may optionally be increased to three or four octets.
168 fr_hdrlen(const u_char *p, u_int addr_len)
170 if (!p[addr_len + 1] /* pad exist */)
171 return addr_len + 1 /* UI */ + 1 /* pad */ + 1 /* NLPID */;
173 return addr_len + 1 /* UI */ + 1 /* NLPID */;
177 fr_hdr_print(int length, u_int addr_len, u_int dlci, u_int8_t *flags, u_int16_t nlpid)
180 (void)printf("Q.922, DLCI %u, length %u: ",
184 if (nlpid <= 0xff) /* if its smaller than 256 then its a NLPID */
185 (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], NLPID %s (0x%02x), length %u: ",
188 bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
189 tok2str(nlpid_values,"unknown", nlpid),
192 else /* must be an ethertype */
193 (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], cisco-ethertype %s (0x%04x), length %u: ",
196 bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
197 tok2str(ethertype_values, "unknown", nlpid),
204 fr_if_print(const struct pcap_pkthdr *h, register const u_char *p)
206 register u_int length = h->len;
207 register u_int caplen = h->caplen;
209 TCHECK2(*p, 4); /* minimum frame header length */
211 if ((length = fr_print(p, length)) == 0)
221 fr_print(register const u_char *p, u_int length)
223 u_int16_t extracted_ethertype;
231 if (parse_q922_addr(p, &dlci, &sdlcore, &addr_len, flags)) {
232 printf("Q.922, invalid address");
236 TCHECK2(*p,addr_len+1+1);
237 hdr_len = fr_hdrlen(p, addr_len);
240 if (p[addr_len] != 0x03 && dlci != 0) {
242 /* lets figure out if we have cisco style encapsulation: */
243 extracted_ethertype = EXTRACT_16BITS(p+addr_len);
246 fr_hdr_print(length, addr_len, dlci, flags, extracted_ethertype);
248 if (ether_encap_print(extracted_ethertype,
249 p+addr_len+ETHERTYPE_LEN,
250 length-addr_len-ETHERTYPE_LEN,
251 length-addr_len-ETHERTYPE_LEN,
252 &extracted_ethertype) == 0)
253 /* ether_type not known, probably it wasn't one */
254 printf("UI %02x! ", p[addr_len]);
259 if (!p[addr_len + 1]) { /* pad byte should be used with 3-byte Q.922 */
262 } else if (addr_len == 3)
265 nlpid = p[hdr_len - 1];
268 fr_hdr_print(length, addr_len, dlci, flags, nlpid);
274 ip_print(gndo, p, length);
279 ip6_print(p, length);
285 isoclns_print(p-1, length+1, length+1); /* OSI printers need the NLPID field */
289 if (snap_print(p, length, length, &extracted_ethertype, 0) == 0) {
290 /* ether_type not known, print raw packet */
292 fr_hdr_print(length + hdr_len, hdr_len,
294 if (!suppress_default_print)
295 default_print(p - hdr_len, length + hdr_len);
300 q933_print(p, length);
304 frf15_print(p, length);
309 fr_hdr_print(length + hdr_len, addr_len,
312 default_print(p, length);
323 #define MFR_CTRL_MSG_ADD_LINK 1
324 #define MFR_CTRL_MSG_ADD_LINK_ACK 2
325 #define MFR_CTRL_MSG_ADD_LINK_REJ 3
326 #define MFR_CTRL_MSG_HELLO 4
327 #define MFR_CTRL_MSG_HELLO_ACK 5
328 #define MFR_CTRL_MSG_REMOVE_LINK 6
329 #define MFR_CTRL_MSG_REMOVE_LINK_ACK 7
331 struct tok mfr_ctrl_msg_values[] = {
332 { MFR_CTRL_MSG_ADD_LINK, "Add Link" },
333 { MFR_CTRL_MSG_ADD_LINK_ACK, "Add Link ACK" },
334 { MFR_CTRL_MSG_ADD_LINK_REJ, "Add Link Reject" },
335 { MFR_CTRL_MSG_HELLO, "Hello" },
336 { MFR_CTRL_MSG_HELLO_ACK, "Hello ACK" },
337 { MFR_CTRL_MSG_REMOVE_LINK, "Remove Link" },
338 { MFR_CTRL_MSG_REMOVE_LINK_ACK, "Remove Link ACK" },
342 #define MFR_CTRL_IE_BUNDLE_ID 1
343 #define MFR_CTRL_IE_LINK_ID 2
344 #define MFR_CTRL_IE_MAGIC_NUM 3
345 #define MFR_CTRL_IE_TIMESTAMP 5
346 #define MFR_CTRL_IE_VENDOR_EXT 6
347 #define MFR_CTRL_IE_CAUSE 7
349 struct tok mfr_ctrl_ie_values[] = {
350 { MFR_CTRL_IE_BUNDLE_ID, "Bundle ID"},
351 { MFR_CTRL_IE_LINK_ID, "Link ID"},
352 { MFR_CTRL_IE_MAGIC_NUM, "Magic Number"},
353 { MFR_CTRL_IE_TIMESTAMP, "Timestamp"},
354 { MFR_CTRL_IE_VENDOR_EXT, "Vendor Extension"},
355 { MFR_CTRL_IE_CAUSE, "Cause"},
359 #define MFR_ID_STRING_MAXLEN 50
361 struct ie_tlv_header_t {
367 mfr_print(register const u_char *p, u_int length)
369 u_int tlen,idx,hdr_len = 0;
370 u_int16_t sequence_num;
371 u_int8_t ie_type,ie_len;
372 const u_int8_t *tptr;
376 * FRF.16 Link Integrity Control Frame
379 * +----+----+----+----+----+----+----+----+
380 * | B | E | C=1| 0 0 0 0 | EA |
381 * +----+----+----+----+----+----+----+----+
382 * | 0 0 0 0 0 0 0 0 |
383 * +----+----+----+----+----+----+----+----+
385 * +----+----+----+----+----+----+----+----+
388 TCHECK2(*p, 4); /* minimum frame header length */
390 if ((p[0] & MFR_BEC_MASK) == MFR_CTRL_FRAME && p[1] == 0) {
391 printf("FRF.16 Control, Flags [%s], %s, length %u",
392 bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK)),
393 tok2str(mfr_ctrl_msg_values,"Unknown Message (0x%02x)",p[2]),
402 while (tlen>sizeof(struct ie_tlv_header_t)) {
403 TCHECK2(*tptr, sizeof(struct ie_tlv_header_t));
407 printf("\n\tIE %s (%u), length %u: ",
408 tok2str(mfr_ctrl_ie_values,"Unknown",ie_type),
412 /* infinite loop check */
413 if (ie_type == 0 || ie_len <= sizeof(struct ie_tlv_header_t))
416 TCHECK2(*tptr,ie_len);
417 tptr+=sizeof(struct ie_tlv_header_t);
418 /* tlv len includes header */
419 ie_len-=sizeof(struct ie_tlv_header_t);
420 tlen-=sizeof(struct ie_tlv_header_t);
424 case MFR_CTRL_IE_MAGIC_NUM:
425 printf("0x%08x",EXTRACT_32BITS(tptr));
428 case MFR_CTRL_IE_BUNDLE_ID: /* same message format */
429 case MFR_CTRL_IE_LINK_ID:
430 for (idx = 0; idx < ie_len && idx < MFR_ID_STRING_MAXLEN; idx++) {
431 if (*(tptr+idx) != 0) /* don't print null termination */
432 safeputchar(*(tptr+idx));
438 case MFR_CTRL_IE_TIMESTAMP:
439 if (ie_len == sizeof(struct timeval)) {
440 ts_print((const struct timeval *)tptr);
443 /* fall through and hexdump if no unix timestamp */
446 * FIXME those are the defined IEs that lack a decoder
447 * you are welcome to contribute code ;-)
450 case MFR_CTRL_IE_VENDOR_EXT:
451 case MFR_CTRL_IE_CAUSE:
455 print_unknown_data(tptr,"\n\t ",ie_len);
459 /* do we want to see a hexdump of the IE ? */
461 print_unknown_data(tptr,"\n\t ",ie_len);
469 * FRF.16 Fragmentation Frame
472 * +----+----+----+----+----+----+----+----+
473 * | B | E | C=0|seq. (high 4 bits) | EA |
474 * +----+----+----+----+----+----+----+----+
475 * | sequence (low 8 bits) |
476 * +----+----+----+----+----+----+----+----+
477 * | DLCI (6 bits) | CR | EA |
478 * +----+----+----+----+----+----+----+----+
479 * | DLCI (4 bits) |FECN|BECN| DE | EA |
480 * +----+----+----+----+----+----+----+----+
483 sequence_num = (p[0]&0x1e)<<7 | p[1];
484 /* whole packet or first fragment ? */
485 if ((p[0] & MFR_BEC_MASK) == MFR_FRAG_FRAME ||
486 (p[0] & MFR_BEC_MASK) == MFR_B_BIT) {
487 printf("FRF.16 Frag, seq %u, Flags [%s], ",
489 bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK)));
491 fr_print(p+hdr_len,length-hdr_len);
495 /* must be a middle or the last fragment */
496 printf("FRF.16 Frag, seq %u, Flags [%s]",
498 bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK)));
499 print_unknown_data(p,"\n\t",length);
508 /* an NLPID of 0xb1 indicates a 2-byte
512 * +----+----+----+----+----+----+----+----+
514 * +----+----+----+----+----+----+----+----+
515 * | NLPID (8 bits) | NLPID=0xb1
516 * +----+----+----+----+----+----+----+----+
517 * | B | E | C |seq. (high 4 bits) | R |
518 * +----+----+----+----+----+----+----+----+
519 * | sequence (low 8 bits) |
520 * +----+----+----+----+----+----+----+----+
523 #define FR_FRF15_FRAGTYPE 0x01
526 frf15_print (const u_char *p, u_int length) {
528 u_int16_t sequence_num, flags;
530 flags = p[0]&MFR_BEC_MASK;
531 sequence_num = (p[0]&0x1e)<<7 | p[1];
533 printf("FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u",
535 bittok2str(frf_flag_values,"none",flags),
536 p[0]&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End",
540 * depending on all permutations of the B, E and C bit
541 * dig as deep as we can - e.g. on the first (B) fragment
542 * there is enough payload to print the IP header
543 * on non (B) fragments it depends if the fragmentation
544 * model is end-to-end or interface based wether we want to print
545 * another Q.922 header
551 * Q.933 decoding portion for framerelay specific.
554 /* Q.933 packet format
555 Format of Other Protocols
557 +-------------------------------+
559 +---------------+---------------+
560 |Control 0x03 | NLPID 0x08 |
561 +---------------+---------------+
563 | octet 1 | octet 2 |
564 +-------------------------------+
566 | octet 2 | octet 2 |
567 +-------------------------------+
569 +-------------------------------+
571 +-------------------------------+
574 /* L2 (Octet 1)- Call Reference Usually is 0x0 */
577 * L2 (Octet 2)- Message Types definition 1 byte long.
580 #define MSG_TYPE_ESC_TO_NATIONAL 0x00
581 #define MSG_TYPE_ALERT 0x01
582 #define MSG_TYPE_CALL_PROCEEDING 0x02
583 #define MSG_TYPE_CONNECT 0x07
584 #define MSG_TYPE_CONNECT_ACK 0x0F
585 #define MSG_TYPE_PROGRESS 0x03
586 #define MSG_TYPE_SETUP 0x05
588 #define MSG_TYPE_DISCONNECT 0x45
589 #define MSG_TYPE_RELEASE 0x4D
590 #define MSG_TYPE_RELEASE_COMPLETE 0x5A
591 #define MSG_TYPE_RESTART 0x46
592 #define MSG_TYPE_RESTART_ACK 0x4E
594 #define MSG_TYPE_STATUS 0x7D
595 #define MSG_TYPE_STATUS_ENQ 0x75
597 struct tok fr_q933_msg_values[] = {
598 { MSG_TYPE_ESC_TO_NATIONAL, "ESC to National" },
599 { MSG_TYPE_ALERT, "Alert" },
600 { MSG_TYPE_CALL_PROCEEDING, "Call proceeding" },
601 { MSG_TYPE_CONNECT, "Connect" },
602 { MSG_TYPE_CONNECT_ACK, "Connect ACK" },
603 { MSG_TYPE_PROGRESS, "Progress" },
604 { MSG_TYPE_SETUP, "Setup" },
605 { MSG_TYPE_DISCONNECT, "Disconnect" },
606 { MSG_TYPE_RELEASE, "Release" },
607 { MSG_TYPE_RELEASE_COMPLETE, "Release Complete" },
608 { MSG_TYPE_RESTART, "Restart" },
609 { MSG_TYPE_RESTART_ACK, "Restart ACK" },
610 { MSG_TYPE_STATUS, "Status Reply" },
611 { MSG_TYPE_STATUS_ENQ, "Status Enquiry" },
615 #define MSG_ANSI_LOCKING_SHIFT 0x95
617 #define FR_LMI_ANSI_REPORT_TYPE_IE 0x01
618 #define FR_LMI_ANSI_LINK_VERIFY_IE_91 0x19 /* details? */
619 #define FR_LMI_ANSI_LINK_VERIFY_IE 0x03
620 #define FR_LMI_ANSI_PVC_STATUS_IE 0x07
622 #define FR_LMI_CCITT_REPORT_TYPE_IE 0x51
623 #define FR_LMI_CCITT_LINK_VERIFY_IE 0x53
624 #define FR_LMI_CCITT_PVC_STATUS_IE 0x57
626 struct tok fr_q933_ie_values_codeset5[] = {
627 { FR_LMI_ANSI_REPORT_TYPE_IE, "ANSI Report Type" },
628 { FR_LMI_ANSI_LINK_VERIFY_IE_91, "ANSI Link Verify" },
629 { FR_LMI_ANSI_LINK_VERIFY_IE, "ANSI Link Verify" },
630 { FR_LMI_ANSI_PVC_STATUS_IE, "ANSI PVC Status" },
631 { FR_LMI_CCITT_REPORT_TYPE_IE, "CCITT Report Type" },
632 { FR_LMI_CCITT_LINK_VERIFY_IE, "CCITT Link Verify" },
633 { FR_LMI_CCITT_PVC_STATUS_IE, "CCITT PVC Status" },
637 #define FR_LMI_REPORT_TYPE_IE_FULL_STATUS 0
638 #define FR_LMI_REPORT_TYPE_IE_LINK_VERIFY 1
639 #define FR_LMI_REPORT_TYPE_IE_ASYNC_PVC 2
641 struct tok fr_lmi_report_type_ie_values[] = {
642 { FR_LMI_REPORT_TYPE_IE_FULL_STATUS, "Full Status" },
643 { FR_LMI_REPORT_TYPE_IE_LINK_VERIFY, "Link verify" },
644 { FR_LMI_REPORT_TYPE_IE_ASYNC_PVC, "Async PVC Status" },
648 /* array of 16 codepages - currently we only support codepage 1,5 */
649 static struct tok *fr_q933_ie_codesets[] = {
651 fr_q933_ie_values_codeset5,
655 fr_q933_ie_values_codeset5,
668 static int fr_q933_print_ie_codeset5(const struct ie_tlv_header_t *ie_p,
671 typedef int (*codeset_pr_func_t)(const struct ie_tlv_header_t *ie_p,
674 /* array of 16 codepages - currently we only support codepage 1,5 */
675 static codeset_pr_func_t fr_q933_print_ie_codeset[] = {
677 fr_q933_print_ie_codeset5,
681 fr_q933_print_ie_codeset5,
695 q933_print(const u_char *p, u_int length)
697 const u_char *ptemp = p;
698 struct ie_tlv_header_t *ie_p;
702 u_int ie_is_known = 0;
704 if (length < 9) { /* shortest: Q.933a LINK VERIFY */
709 codeset = p[2]&0x0f; /* extract the codeset */
711 if (p[2] == MSG_ANSI_LOCKING_SHIFT)
714 printf("%s", eflag ? "" : "Q.933, ");
716 /* printing out header part */
717 printf("%s, codeset %u", is_ansi ? "ANSI" : "CCITT", codeset);
720 printf(", Call Ref: 0x%02x", p[0]);
723 printf(", %s (0x%02x), length %u",
724 tok2str(fr_q933_msg_values,"unknown message",p[1]),
729 tok2str(fr_q933_msg_values,"unknown message 0x%02x",p[1]));
731 olen = length; /* preserve the original length for non verbose mode */
733 if (length < (u_int)(2 - is_ansi)) {
737 length -= 2 - is_ansi;
738 ptemp += 2 + is_ansi;
740 /* Loop through the rest of IE */
741 while (length > sizeof(struct ie_tlv_header_t )) {
742 ie_p = (struct ie_tlv_header_t *)ptemp;
743 if (length < sizeof(struct ie_tlv_header_t ) ||
744 length < sizeof(struct ie_tlv_header_t ) + ie_p->ie_len) {
745 if (vflag) /* not bark if there is just a trailer */
746 printf("\n[|q.933]");
748 printf(", length %u",olen);
752 /* lets do the full IE parsing only in verbose mode
753 * however some IEs (DLCI Status, Link Verify)
754 * are also intereststing in non-verbose mode */
756 printf("\n\t%s IE (0x%02x), length %u: ",
757 tok2str(fr_q933_ie_codesets[codeset],"unknown",ie_p->ie_type),
762 if (ie_p->ie_type == 0 || ie_p->ie_len == 0)
765 if (fr_q933_print_ie_codeset[codeset] != NULL)
766 ie_is_known = fr_q933_print_ie_codeset[codeset](ie_p, ptemp);
768 if (vflag >= 1 && !ie_is_known)
769 print_unknown_data(ptemp+2,"\n\t",ie_p->ie_len);
771 /* do we want to see a hexdump of the IE ? */
772 if (vflag> 1 && ie_is_known)
773 print_unknown_data(ptemp+2,"\n\t ",ie_p->ie_len);
775 length = length - ie_p->ie_len - 2;
776 ptemp = ptemp + ie_p->ie_len + 2;
779 printf(", length %u",olen);
783 fr_q933_print_ie_codeset5(const struct ie_tlv_header_t *ie_p, const u_char *p)
787 switch (ie_p->ie_type) {
789 case FR_LMI_ANSI_REPORT_TYPE_IE: /* fall through */
790 case FR_LMI_CCITT_REPORT_TYPE_IE:
793 tok2str(fr_lmi_report_type_ie_values,"unknown",p[2]),
797 case FR_LMI_ANSI_LINK_VERIFY_IE: /* fall through */
798 case FR_LMI_CCITT_LINK_VERIFY_IE:
799 case FR_LMI_ANSI_LINK_VERIFY_IE_91:
802 printf("TX Seq: %3d, RX Seq: %3d", p[2], p[3]);
805 case FR_LMI_ANSI_PVC_STATUS_IE: /* fall through */
806 case FR_LMI_CCITT_PVC_STATUS_IE:
809 /* now parse the DLCI information element. */
810 if ((ie_p->ie_len < 3) ||
812 ((ie_p->ie_len == 3) && !(p[3] & 0x80)) ||
813 ((ie_p->ie_len == 4) && ((p[3] & 0x80) || !(p[4] & 0x80))) ||
814 ((ie_p->ie_len == 5) && ((p[3] & 0x80) || (p[4] & 0x80) ||
816 (ie_p->ie_len > 5) ||
817 !(p[ie_p->ie_len + 1] & 0x80))
818 printf("Invalid DLCI IE");
820 dlci = ((p[2] & 0x3F) << 4) | ((p[3] & 0x78) >> 3);
821 if (ie_p->ie_len == 4)
822 dlci = (dlci << 6) | ((p[4] & 0x7E) >> 1);
823 else if (ie_p->ie_len == 5)
824 dlci = (dlci << 13) | (p[4] & 0x7F) | ((p[5] & 0x7E) >> 1);
826 printf("DLCI %u: status %s%s", dlci,
827 p[ie_p->ie_len + 1] & 0x8 ? "New, " : "",
828 p[ie_p->ie_len + 1] & 0x2 ? "Active" : "Inactive");