The Tcpdump Group git mirrors - tcpdump/blob - print-fr.c

   1 /*
   2  * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 #ifndef lint
  23 static const char rcsid[] _U_ =
  24         "@(#)$Header: /tcpdump/master/tcpdump/print-fr.c,v 1.35 2005-04-26 07:26:34 guy Exp $ (LBL)";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <tcpdump-stdinc.h>
  32
  33 #include <stdio.h>
  34 #include <string.h>
  35 #include <pcap.h>
  36
  37 #include "addrtoname.h"
  38 #include "interface.h"
  39 #include "ethertype.h"
  40 #include "nlpid.h"
  41 #include "extract.h"
  42 #include "oui.h"
  43
  44 static void frf15_print(const u_char *, u_int);
  45
  46 /*
  47  * the frame relay header has a variable length
  48  *
  49  * the EA bit determines if there is another byte
  50  * in the header
  51  *
  52  * minimum header length is 2 bytes
  53  * maximum header length is 4 bytes
  54  *
  55  *      7    6    5    4    3    2    1    0
  56  *    +----+----+----+----+----+----+----+----+
  57  *    |        DLCI (6 bits)        | CR | EA |
  58  *    +----+----+----+----+----+----+----+----+
  59  *    |   DLCI (4 bits)   |FECN|BECN| DE | EA |
  60  *    +----+----+----+----+----+----+----+----+
  61  *    |           DLCI (7 bits)          | EA |
  62  *    +----+----+----+----+----+----+----+----+
  63  *    |        DLCI (6 bits)        |SDLC| EA |
  64  *    +----+----+----+----+----+----+----+----+
  65  */
  66
  67 #define FR_EA_BIT       0x01
  68
  69 #define FR_CR_BIT       0x02000000
  70 #define FR_DE_BIT       0x00020000
  71 #define FR_BECN_BIT     0x00040000
  72 #define FR_FECN_BIT     0x00080000
  73 #define FR_SDLC_BIT     0x00000002
  74
  75
  76 struct tok fr_header_flag_values[] = {
  77     { FR_CR_BIT, "C!" },
  78     { FR_DE_BIT, "DE" },
  79     { FR_BECN_BIT, "BECN" },
  80     { FR_FECN_BIT, "FECN" },
  81     { FR_SDLC_BIT, "sdlcore" },
  82     { 0, NULL }
  83 };
  84
  85
  86 /* Finds out Q.922 address length, DLCI and flags. Returns 0 on success
  87  * save the flags dep. on address length
  88  */
  89 static int parse_q922_addr(const u_char *p, u_int *dlci, u_int *sdlcore,
  90                            u_int *addr_len, u_int8_t *flags)
  91 {
  92         if ((p[0] & FR_EA_BIT))
  93                 return -1;
  94
  95         *addr_len = 2;
  96         *dlci = ((p[0] & 0xFC) << 2) | ((p[1] & 0xF0) >> 4);
  97
  98         flags[0] = p[0] & 0x02; /* populate the first flag fields */
  99         flags[1] = p[1] & 0x0c;
 100
 101         if (p[1] & FR_EA_BIT)
 102                 return 0;       /* 2-byte Q.922 address */
 103
 104         p += 2;
 105         (*addr_len)++;          /* 3- or 4-byte Q.922 address */
 106         if ((p[0] & FR_EA_BIT) == 0) {
 107                 *dlci = (*dlci << 7) | (p[0] >> 1);
 108                 (*addr_len)++;  /* 4-byte Q.922 address */
 109                 p++;
 110         }
 111
 112         if ((p[0] & FR_EA_BIT) == 0)
 113                 return -1; /* more than 4 bytes of Q.922 address? */
 114
 115         flags[3] = p[0] & 0x02;
 116
 117         if (p[0] & 0x02)
 118                 *sdlcore =  p[0] >> 2;
 119         else
 120                 *dlci = (*dlci << 6) | (p[0] >> 2);
 121
 122         return 0;
 123 }
 124
 125 /* Frame Relay packet structure, with flags and CRC removed
 126
 127                   +---------------------------+
 128                   |       Q.922 Address*      |
 129                   +--                       --+
 130                   |                           |
 131                   +---------------------------+
 132                   | Control (UI = 0x03)       |
 133                   +---------------------------+
 134                   | Optional Pad      (0x00)  |
 135                   +---------------------------+
 136                   | NLPID                     |
 137                   +---------------------------+
 138                   |             .             |
 139                   |             .             |
 140                   |             .             |
 141                   |           Data            |
 142                   |             .             |
 143                   |             .             |
 144                   +---------------------------+
 145
 146            * Q.922 addresses, as presently defined, are two octets and
 147              contain a 10-bit DLCI.  In some networks Q.922 addresses
 148              may optionally be increased to three or four octets.
 149 */
 150
 151 static u_int
 152 fr_hdrlen(const u_char *p, u_int addr_len, u_int caplen)
 153 {
 154         if ((caplen > addr_len + 1 /* UI */ + 1 /* pad */) &&
 155             !p[addr_len + 1] /* pad exist */)
 156                 return addr_len + 1 /* UI */ + 1 /* pad */ + 1 /* NLPID */;
 157         else
 158                 return addr_len + 1 /* UI */ + 1 /* NLPID */;
 159 }
 160
 161 static void
 162 fr_hdr_print(int length, u_int addr_len, u_int dlci, u_int8_t *flags, u_int16_t nlpid)
 163 {
 164     if (qflag) {
 165         (void)printf("Q.922, DLCI %u, length %u: ",
 166                      dlci,
 167                      length);
 168     } else {
 169         if (nlpid <= 0xff) /* if its smaller than 256 then its a NLPID */
 170             (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], NLPID %s (0x%02x), length %u: ",
 171                          addr_len,
 172                          dlci,
 173                          bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
 174                          tok2str(nlpid_values,"unknown", nlpid),
 175                          nlpid,
 176                          length);
 177         else /* must be an ethertype */
 178             (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], cisco-ethertype %s (0x%04x), length %u: ",
 179                          addr_len,
 180                          dlci,
 181                          bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
 182                          tok2str(ethertype_values, "unknown", nlpid),
 183                          nlpid,
 184                          length);
 185     }
 186 }
 187
 188 u_int
 189 fr_if_print(const struct pcap_pkthdr *h, register const u_char *p)
 190 {
 191         register u_int length = h->len;
 192         register u_int caplen = h->caplen;
 193         u_int16_t extracted_ethertype;
 194         u_int dlci;
 195         u_int sdlcore;
 196         u_int addr_len;
 197         u_int16_t nlpid;
 198         u_int hdr_len;
 199         u_int8_t flags[4];
 200
 201         if (caplen < 4) {       /* minimum frame header length */
 202                 printf("[|fr]");
 203                 return caplen;
 204         }
 205
 206         if (parse_q922_addr(p, &dlci, &sdlcore, &addr_len, flags)) {
 207                 printf("Q.922, invalid address");
 208                 return caplen;
 209         }
 210
 211         hdr_len = fr_hdrlen(p, addr_len, caplen);
 212
 213         if (caplen < hdr_len) {
 214                 printf("[|fr]");
 215                 return caplen;
 216         }
 217
 218         if (p[addr_len] != 0x03 && dlci != 0) {
 219
 220                 /* lets figure out if we have cisco style encapsulation: */
 221                 extracted_ethertype = EXTRACT_16BITS(p+addr_len);
 222
 223                 if (eflag)
 224                     fr_hdr_print(length, addr_len, dlci, flags, extracted_ethertype);
 225
 226                 if (ether_encap_print(extracted_ethertype,
 227                                       p+addr_len+ETHERTYPE_LEN,
 228                                       length-addr_len-ETHERTYPE_LEN,
 229                                       caplen-addr_len-ETHERTYPE_LEN,
 230                                       &extracted_ethertype) == 0)
 231                     /* ether_type not known, probably it wasn't one */
 232                     printf("UI %02x! ", p[addr_len]);
 233                 else
 234                     return hdr_len;
 235         }
 236
 237         if (!p[addr_len + 1]) { /* pad byte should be used with 3-byte Q.922 */
 238                 if (addr_len != 3)
 239                         printf("Pad! ");
 240         } else if (addr_len == 3)
 241                 printf("No pad! ");
 242
 243         nlpid = p[hdr_len - 1];
 244
 245         if (eflag)
 246                 fr_hdr_print(length, addr_len, dlci, flags, nlpid);
 247
 248         p += hdr_len;
 249         length -= hdr_len;
 250         caplen -= hdr_len;
 251
 252         switch (nlpid) {
 253         case NLPID_IP:
 254                 ip_print(gndo, p, length);
 255                 break;
 256
 257 #ifdef INET6
 258         case NLPID_IP6:
 259                 ip6_print(p, length);
 260                 break;
 261 #endif
 262         case NLPID_CLNP:
 263         case NLPID_ESIS:
 264         case NLPID_ISIS:
 265                 isoclns_print(p-1, length+1, caplen+1); /* OSI printers need the NLPID field */
 266                 break;
 267
 268         case NLPID_SNAP:
 269                 if (snap_print(p, length, caplen, &extracted_ethertype, 0) == 0) {
 270                         /* ether_type not known, print raw packet */
 271                         if (!eflag)
 272                             fr_hdr_print(length + hdr_len, hdr_len,
 273                                          dlci, flags, nlpid);
 274                         if (!xflag && !qflag)
 275                             default_print(p - hdr_len, caplen + hdr_len);
 276                 }
 277                 break;
 278
 279         case NLPID_Q933:
 280                 q933_print(p, length);
 281                 break;
 282
 283         case NLPID_MFR:
 284                 frf15_print(p, length);
 285                 break;
 286
 287         default:
 288                 if (!eflag)
 289                     fr_hdr_print(length + hdr_len, addr_len,
 290                                      dlci, flags, nlpid);
 291                 if (!xflag)
 292                         default_print(p, caplen);
 293         }
 294
 295         return hdr_len;
 296 }
 297
 298 /* an NLPID of 0xb1 indicates a 2-byte
 299  * FRF.15 header
 300  *
 301  *      7    6    5    4    3    2    1    0
 302  *    +----+----+----+----+----+----+----+----+
 303  *    ~              Q.922 header             ~
 304  *    +----+----+----+----+----+----+----+----+
 305  *    |             NLPID (8 bits)            | NLPID=0xb1
 306  *    +----+----+----+----+----+----+----+----+
 307  *    | B  | E  | C  |seq. (high 4 bits) | R  |
 308  *    +----+----+----+----+----+----+----+----+
 309  *    |        sequence  (low 8 bits)         |
 310  *    +----+----+----+----+----+----+----+----+
 311  */
 312
 313 struct tok frf15_flag_values[] = {
 314     { 0x80, "Begin" },
 315     { 0x40, "End" },
 316     { 0x20, "Control" },
 317     { 0, NULL }
 318 };
 319
 320 #define FR_FRF15_FRAGTYPE 0x01
 321
 322 static void
 323 frf15_print (const u_char *p, u_int length) {
 324
 325     u_int16_t sequence_num, flags;
 326
 327     flags = p[0]&0xe0;
 328     sequence_num = (p[0]&0x1e)<<7 | p[1];
 329
 330     printf("FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u",
 331            sequence_num,
 332            bittok2str(frf15_flag_values,"none",flags),
 333            flags&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End",
 334            length);
 335
 336 /* TODO:
 337  * depending on all permutations of the B, E and C bit
 338  * dig as deep as we can - e.g. on the first (B) fragment
 339  * there is enough payload to print the IP header
 340  * on non (B) fragments it depends if the fragmentation
 341  * model is end-to-end or interface based wether we want to print
 342  * another Q.922 header
 343  */
 344
 345 }
 346
 347 /*
 348  * Q.933 decoding portion for framerelay specific.
 349  */
 350
 351 /* Q.933 packet format
 352                       Format of Other Protocols
 353                           using Q.933 NLPID
 354                   +-------------------------------+
 355                   |        Q.922 Address          |
 356                   +---------------+---------------+
 357                   |Control  0x03  | NLPID   0x08  |
 358                   +---------------+---------------+
 359                   |          L2 Protocol ID       |
 360                   | octet 1       |  octet 2      |
 361                   +-------------------------------+
 362                   |          L3 Protocol ID       |
 363                   | octet 2       |  octet 2      |
 364                   +-------------------------------+
 365                   |         Protocol Data         |
 366                   +-------------------------------+
 367                   | FCS                           |
 368                   +-------------------------------+
 369  */
 370
 371 /* L2 (Octet 1)- Call Reference Usually is 0x0 */
 372
 373 /*
 374  * L2 (Octet 2)- Message Types definition 1 byte long.
 375  */
 376 /* Call Establish */
 377 #define MSG_TYPE_ESC_TO_NATIONAL  0x00
 378 #define MSG_TYPE_ALERT            0x01
 379 #define MSG_TYPE_CALL_PROCEEDING  0x02
 380 #define MSG_TYPE_CONNECT          0x07
 381 #define MSG_TYPE_CONNECT_ACK      0x0F
 382 #define MSG_TYPE_PROGRESS         0x03
 383 #define MSG_TYPE_SETUP            0x05
 384 /* Call Clear */
 385 #define MSG_TYPE_DISCONNECT       0x45
 386 #define MSG_TYPE_RELEASE          0x4D
 387 #define MSG_TYPE_RELEASE_COMPLETE 0x5A
 388 #define MSG_TYPE_RESTART          0x46
 389 #define MSG_TYPE_RESTART_ACK      0x4E
 390 /* Status */
 391 #define MSG_TYPE_STATUS           0x7D
 392 #define MSG_TYPE_STATUS_ENQ       0x75
 393
 394 struct tok fr_q933_msg_values[] = {
 395     { MSG_TYPE_ESC_TO_NATIONAL, "ESC to National" },
 396     { MSG_TYPE_ALERT, "Alert" },
 397     { MSG_TYPE_CALL_PROCEEDING, "Call proceeding" },
 398     { MSG_TYPE_CONNECT, "Connect" },
 399     { MSG_TYPE_CONNECT_ACK, "Connect ACK" },
 400     { MSG_TYPE_PROGRESS, "Progress" },
 401     { MSG_TYPE_SETUP, "Setup" },
 402     { MSG_TYPE_DISCONNECT, "Disconnect" },
 403     { MSG_TYPE_RELEASE, "Release" },
 404     { MSG_TYPE_RELEASE_COMPLETE, "Release Complete" },
 405     { MSG_TYPE_RESTART, "Restart" },
 406     { MSG_TYPE_RESTART_ACK, "Restart ACK" },
 407     { MSG_TYPE_STATUS, "Status Reply" },
 408     { MSG_TYPE_STATUS_ENQ, "Status Enquiry" },
 409     { 0, NULL }
 410 };
 411
 412 #define MSG_ANSI_LOCKING_SHIFT  0x95
 413
 414 #define FR_LMI_ANSI_REPORT_TYPE_IE      0x01
 415 #define FR_LMI_ANSI_LINK_VERIFY_IE_91   0x19 /* details? */
 416 #define FR_LMI_ANSI_LINK_VERIFY_IE      0x03
 417 #define FR_LMI_ANSI_PVC_STATUS_IE       0x07
 418
 419 #define FR_LMI_CCITT_REPORT_TYPE_IE     0x51
 420 #define FR_LMI_CCITT_LINK_VERIFY_IE     0x53
 421 #define FR_LMI_CCITT_PVC_STATUS_IE      0x57
 422
 423 struct tok fr_q933_ie_values_codeset5[] = {
 424     { FR_LMI_ANSI_REPORT_TYPE_IE, "ANSI Report Type" },
 425     { FR_LMI_ANSI_LINK_VERIFY_IE_91, "ANSI Link Verify" },
 426     { FR_LMI_ANSI_LINK_VERIFY_IE, "ANSI Link Verify" },
 427     { FR_LMI_ANSI_PVC_STATUS_IE, "ANSI PVC Status" },
 428     { FR_LMI_CCITT_REPORT_TYPE_IE, "CCITT Report Type" },
 429     { FR_LMI_CCITT_LINK_VERIFY_IE, "CCITT Link Verify" },
 430     { FR_LMI_CCITT_PVC_STATUS_IE, "CCITT PVC Status" },
 431     { 0, NULL }
 432 };
 433
 434 #define FR_LMI_REPORT_TYPE_IE_FULL_STATUS 0
 435 #define FR_LMI_REPORT_TYPE_IE_LINK_VERIFY 1
 436 #define FR_LMI_REPORT_TYPE_IE_ASYNC_PVC   2
 437
 438 struct tok fr_lmi_report_type_ie_values[] = {
 439     { FR_LMI_REPORT_TYPE_IE_FULL_STATUS, "Full Status" },
 440     { FR_LMI_REPORT_TYPE_IE_LINK_VERIFY, "Link verify" },
 441     { FR_LMI_REPORT_TYPE_IE_ASYNC_PVC, "Async PVC Status" },
 442     { 0, NULL }
 443 };
 444
 445 /* array of 16 codepages - currently we only support codepage 5 */
 446 static struct tok *fr_q933_ie_codesets[] = {
 447     NULL,
 448     NULL,
 449     NULL,
 450     NULL,
 451     NULL,
 452     fr_q933_ie_values_codeset5,
 453     NULL,
 454     NULL,
 455     NULL,
 456     NULL,
 457     NULL,
 458     NULL,
 459     NULL,
 460     NULL,
 461     NULL,
 462     NULL
 463 };
 464
 465
 466 struct common_ie_header {
 467     u_int8_t ie_id;
 468     u_int8_t ie_len;
 469 };
 470
 471 static int fr_q933_print_ie_codeset5(const struct common_ie_header *ie_p,
 472     const u_char *p);
 473
 474 typedef int (*codeset_pr_func_t)(const struct common_ie_header *ie_p,
 475     const u_char *p);
 476
 477 /* array of 16 codepages - currently we only support codepage 5 */
 478 static codeset_pr_func_t fr_q933_print_ie_codeset[] = {
 479     NULL,
 480     NULL,
 481     NULL,
 482     NULL,
 483     NULL,
 484     fr_q933_print_ie_codeset5,
 485     NULL,
 486     NULL,
 487     NULL,
 488     NULL,
 489     NULL,
 490     NULL,
 491     NULL,
 492     NULL,
 493     NULL,
 494     NULL
 495 };
 496
 497 void
 498 q933_print(const u_char *p, u_int length)
 499 {
 500         const u_char *ptemp = p;
 501         struct common_ie_header *ie_p;
 502         int olen;
 503         int is_ansi = 0;
 504         u_int codeset;
 505
 506         if (length < 9) {       /* shortest: Q.933a LINK VERIFY */
 507                 printf("[|q.933]");
 508                 return;
 509         }
 510
 511         codeset = p[2]&0x0f;   /* extract the codeset */
 512
 513         if (p[2] == MSG_ANSI_LOCKING_SHIFT)
 514                 is_ansi = 1;
 515
 516         printf("%s", eflag ? "" : "Q.933, ");
 517
 518         /* printing out header part */
 519         printf(is_ansi ? "ANSI" : "CCITT");
 520
 521         if (p[0])
 522                 printf(", Call Ref: 0x%02x", p[0]);
 523
 524         if (vflag)
 525             printf(", %s (0x%02x), length %u",
 526                    tok2str(fr_q933_msg_values,"unknown message",p[1]),
 527                    p[1],
 528                    length);
 529         else
 530             printf(", %s",
 531                    tok2str(fr_q933_msg_values,"unknown message 0x%02x",p[1]));
 532
 533         olen = length; /* preserve the original length for non verbose mode */
 534
 535         if (length < (u_int)(2 - is_ansi)) {
 536                 printf("[|q.933]");
 537                 return;
 538         }
 539         length -= 2 - is_ansi;
 540         ptemp += 2 + is_ansi;
 541
 542         /* Loop through the rest of IE */
 543         while (length > sizeof(struct common_ie_header)) {
 544                 ie_p = (struct common_ie_header *)ptemp;
 545                 if (length < sizeof(struct common_ie_header) ||
 546                     length < sizeof(struct common_ie_header) + ie_p->ie_len) {
 547                     if (vflag) /* not bark if there is just a trailer */
 548                         printf("\n[|q.933]");
 549                     else
 550                         printf(", length %u",olen);
 551                     return;
 552                 }
 553
 554                 /* lets do the full IE parsing only in verbose mode
 555                  * however some IEs (DLCI Status, Link Verify)
 556                  * are also intereststing in non-verbose mode */
 557                 if (vflag)
 558                     printf("\n\t%s IE (%u), length %u: ",
 559                            tok2str(fr_q933_ie_codesets[codeset],"unknown",ie_p->ie_id),
 560                            ie_p->ie_id,
 561                            ie_p->ie_len);
 562
 563                 if (!fr_q933_print_ie_codeset[codeset] ||
 564                     (*fr_q933_print_ie_codeset[codeset])(ie_p, ptemp)) {
 565                     if (vflag <= 1)
 566                         print_unknown_data(ptemp+2,"\n\t",ie_p->ie_len);
 567                 }
 568
 569                 /* do we want to see a hexdump of the IE ? */
 570                 if (vflag> 1)
 571                     print_unknown_data(ptemp+2,"\n\t  ",ie_p->ie_len);
 572
 573                 length = length - ie_p->ie_len - 2;
 574                 ptemp = ptemp + ie_p->ie_len + 2;
 575         }
 576         if (!vflag)
 577             printf(", length %u",olen);
 578 }
 579
 580 static int
 581 fr_q933_print_ie_codeset5(const struct common_ie_header *ie_p, const u_char *p)
 582 {
 583         u_int dlci;
 584
 585         switch (ie_p->ie_id) {
 586
 587         case FR_LMI_ANSI_REPORT_TYPE_IE: /* fall through */
 588         case FR_LMI_CCITT_REPORT_TYPE_IE:
 589             if (vflag)
 590                 printf("%s (%u)",
 591                        tok2str(fr_lmi_report_type_ie_values,"unknown",p[2]),
 592                        p[2]);
 593             return 1;
 594
 595         case FR_LMI_ANSI_LINK_VERIFY_IE: /* fall through */
 596         case FR_LMI_CCITT_LINK_VERIFY_IE:
 597         case FR_LMI_ANSI_LINK_VERIFY_IE_91:
 598             if (!vflag)
 599                 printf(", ");
 600             printf("TX Seq: %3d, RX Seq: %3d", p[2], p[3]);
 601             return 1;
 602
 603         case FR_LMI_ANSI_PVC_STATUS_IE: /* fall through */
 604         case FR_LMI_CCITT_PVC_STATUS_IE:
 605             if (!vflag)
 606                 printf(", ");
 607             /* now parse the DLCI information element. */
 608             if ((ie_p->ie_len < 3) ||
 609                 (p[2] & 0x80) ||
 610                 ((ie_p->ie_len == 3) && !(p[3] & 0x80)) ||
 611                 ((ie_p->ie_len == 4) && ((p[3] & 0x80) || !(p[4] & 0x80))) ||
 612                 ((ie_p->ie_len == 5) && ((p[3] & 0x80) || (p[4] & 0x80) ||
 613                                    !(p[5] & 0x80))) ||
 614                 (ie_p->ie_len > 5) ||
 615                 !(p[ie_p->ie_len + 1] & 0x80))
 616                 printf("Invalid DLCI IE");
 617
 618             dlci = ((p[2] & 0x3F) << 4) | ((p[3] & 0x78) >> 3);
 619             if (ie_p->ie_len == 4)
 620                 dlci = (dlci << 6) | ((p[4] & 0x7E) >> 1);
 621             else if (ie_p->ie_len == 5)
 622                 dlci = (dlci << 13) | (p[4] & 0x7F) | ((p[5] & 0x7E) >> 1);
 623
 624             printf("DLCI %u: status %s%s", dlci,
 625                     p[ie_p->ie_len + 1] & 0x8 ? "New, " : "",
 626                     p[ie_p->ie_len + 1] & 0x2 ? "Active" : "Inactive");
 627             return 1;
 628         }
 629
 630         return 0;
 631 }