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 1.40 2005-07-21 11:48:43 hannes 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)
 153 {
 154         if (!p[addr_len + 1] /* pad exist */)
 155                 return addr_len + 1 /* UI */ + 1 /* pad */ + 1 /* NLPID */;
 156         else
 157                 return addr_len + 1 /* UI */ + 1 /* NLPID */;
 158 }
 159
 160 static void
 161 fr_hdr_print(int length, u_int addr_len, u_int dlci, u_int8_t *flags, u_int16_t nlpid)
 162 {
 163     if (qflag) {
 164         (void)printf("Q.922, DLCI %u, length %u: ",
 165                      dlci,
 166                      length);
 167     } else {
 168         if (nlpid <= 0xff) /* if its smaller than 256 then its a NLPID */
 169             (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], NLPID %s (0x%02x), length %u: ",
 170                          addr_len,
 171                          dlci,
 172                          bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
 173                          tok2str(nlpid_values,"unknown", nlpid),
 174                          nlpid,
 175                          length);
 176         else /* must be an ethertype */
 177             (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], cisco-ethertype %s (0x%04x), length %u: ",
 178                          addr_len,
 179                          dlci,
 180                          bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
 181                          tok2str(ethertype_values, "unknown", nlpid),
 182                          nlpid,
 183                          length);
 184     }
 185 }
 186
 187 u_int
 188 fr_if_print(const struct pcap_pkthdr *h, register const u_char *p)
 189 {
 190         register u_int length = h->len;
 191         register u_int caplen = h->caplen;
 192
 193         TCHECK2(*p, 4); /* minimum frame header length */
 194
 195         if ((length = fr_print(p, length)) == 0)
 196             return (0);
 197         else
 198             return length;
 199  trunc:
 200         printf("[|fr]");
 201         return caplen;
 202 }
 203
 204 u_int
 205 fr_print(register const u_char *p, u_int length)
 206 {
 207         u_int16_t extracted_ethertype;
 208         u_int dlci;
 209         u_int sdlcore;
 210         u_int addr_len;
 211         u_int16_t nlpid;
 212         u_int hdr_len;
 213         u_int8_t flags[4];
 214
 215         if (parse_q922_addr(p, &dlci, &sdlcore, &addr_len, flags)) {
 216                 printf("Q.922, invalid address");
 217                 return 0;
 218         }
 219
 220         TCHECK2(*p,addr_len+1+1);
 221         hdr_len = fr_hdrlen(p, addr_len);
 222         TCHECK2(*p,hdr_len);
 223
 224         if (p[addr_len] != 0x03 && dlci != 0) {
 225
 226                 /* lets figure out if we have cisco style encapsulation: */
 227                 extracted_ethertype = EXTRACT_16BITS(p+addr_len);
 228
 229                 if (eflag)
 230                     fr_hdr_print(length, addr_len, dlci, flags, extracted_ethertype);
 231
 232                 if (ether_encap_print(extracted_ethertype,
 233                                       p+addr_len+ETHERTYPE_LEN,
 234                                       length-addr_len-ETHERTYPE_LEN,
 235                                       length-addr_len-ETHERTYPE_LEN,
 236                                       &extracted_ethertype) == 0)
 237                     /* ether_type not known, probably it wasn't one */
 238                     printf("UI %02x! ", p[addr_len]);
 239                 else
 240                     return hdr_len;
 241         }
 242
 243         if (!p[addr_len + 1]) { /* pad byte should be used with 3-byte Q.922 */
 244                 if (addr_len != 3)
 245                         printf("Pad! ");
 246         } else if (addr_len == 3)
 247                 printf("No pad! ");
 248
 249         nlpid = p[hdr_len - 1];
 250
 251         if (eflag)
 252                 fr_hdr_print(length, addr_len, dlci, flags, nlpid);
 253         p += hdr_len;
 254         length -= hdr_len;
 255
 256         switch (nlpid) {
 257         case NLPID_IP:
 258                 ip_print(gndo, p, length);
 259                 break;
 260
 261 #ifdef INET6
 262         case NLPID_IP6:
 263                 ip6_print(p, length);
 264                 break;
 265 #endif
 266         case NLPID_CLNP:
 267         case NLPID_ESIS:
 268         case NLPID_ISIS:
 269                 isoclns_print(p-1, length+1, length+1); /* OSI printers need the NLPID field */
 270                 break;
 271
 272         case NLPID_SNAP:
 273                 if (snap_print(p, length, length, &extracted_ethertype, 0) == 0) {
 274                         /* ether_type not known, print raw packet */
 275                         if (!eflag)
 276                             fr_hdr_print(length + hdr_len, hdr_len,
 277                                          dlci, flags, nlpid);
 278                         if (!suppress_default_print)
 279                             default_print(p - hdr_len, length + hdr_len);
 280                 }
 281                 break;
 282
 283         case NLPID_Q933:
 284                 q933_print(p, length);
 285                 break;
 286
 287         case NLPID_MFR:
 288                 frf15_print(p, length);
 289                 break;
 290
 291         default:
 292                 if (!eflag)
 293                     fr_hdr_print(length + hdr_len, addr_len,
 294                                      dlci, flags, nlpid);
 295                 if (!xflag)
 296                         default_print(p, length);
 297         }
 298
 299         return hdr_len;
 300
 301  trunc:
 302         printf("[|fr]");
 303         return 0;
 304
 305 }
 306
 307 #define MFR_B_BIT 0x80
 308 #define MFR_E_BIT 0x40
 309 #define MFR_C_BIT 0x20
 310 #define MFR_BEC_MASK    (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT)
 311 #define MFR_CTRL_FRAME  (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT)
 312 #define MFR_FRAG_FRAME  (MFR_B_BIT | MFR_E_BIT )
 313
 314 #define MFR_CTRL_MSG_ADD_LINK        1
 315 #define MFR_CTRL_MSG_ADD_LINK_ACK    2
 316 #define MFR_CTRL_MSG_ADD_LINK_REJ    3
 317 #define MFR_CTRL_MSG_HELLO           4
 318 #define MFR_CTRL_MSG_HELLO_ACK       5
 319 #define MFR_CTRL_MSG_REMOVE_LINK     6
 320 #define MFR_CTRL_MSG_REMOVE_LINK_ACK 7
 321
 322 struct tok mfr_ctrl_msg_values[] = {
 323     { MFR_CTRL_MSG_ADD_LINK, "Add Link" },
 324     { MFR_CTRL_MSG_ADD_LINK_ACK, "Add Link ACK" },
 325     { MFR_CTRL_MSG_ADD_LINK_REJ, "Add Link Reject" },
 326     { MFR_CTRL_MSG_HELLO, "Hello" },
 327     { MFR_CTRL_MSG_HELLO_ACK, "Hello ACK" },
 328     { MFR_CTRL_MSG_REMOVE_LINK, "Remove Link" },
 329     { MFR_CTRL_MSG_REMOVE_LINK_ACK, "Remove Link ACK" },
 330     { 0, NULL }
 331 };
 332
 333 #define MFR_CTRL_IE_BUNDLE_ID  1
 334 #define MFR_CTRL_IE_LINK_ID    2
 335 #define MFR_CTRL_IE_MAGIC_NUM  3
 336 #define MFR_CTRL_IE_TIMESTAMP  5
 337 #define MFR_CTRL_IE_VENDOR_EXT 6
 338 #define MFR_CTRL_IE_CAUSE      7
 339
 340 struct tok mfr_ctrl_ie_values[] = {
 341     { MFR_CTRL_IE_BUNDLE_ID, "Bundel ID"},
 342     { MFR_CTRL_IE_LINK_ID, "Link ID"},
 343     { MFR_CTRL_IE_MAGIC_NUM, "Magic Number"},
 344     { MFR_CTRL_IE_TIMESTAMP, "Timestamp"},
 345     { MFR_CTRL_IE_VENDOR_EXT, "Vendor Extension"},
 346     { MFR_CTRL_IE_CAUSE, "Cause"},
 347     { 0, NULL }
 348 };
 349
 350 #define MFR_ID_STRING_MAXLEN 50
 351
 352 struct ie_tlv_header_t {
 353     u_int8_t ie_type;
 354     u_int8_t ie_len;
 355 };
 356
 357 u_int
 358 mfr_print(register const u_char *p, u_int length)
 359 {
 360     u_int tlen,idx,hdr_len = 0;
 361     u_int16_t sequence_num;
 362     u_int8_t ie_type,ie_len;
 363     const char *tptr;
 364
 365
 366 /*
 367  * FRF.16 Link Integrity Control Frame
 368  *
 369  *      7    6    5    4    3    2    1    0
 370  *    +----+----+----+----+----+----+----+----+
 371  *    | B  | E  | C=1| 0    0    0    0  | EA |
 372  *    +----+----+----+----+----+----+----+----+
 373  *    | 0    0    0    0    0    0    0    0  |
 374  *    +----+----+----+----+----+----+----+----+
 375  *    |              message type             |
 376  *    +----+----+----+----+----+----+----+----+
 377  */
 378
 379     TCHECK2(*p, 4); /* minimum frame header length */
 380
 381     if ((p[0] & MFR_BEC_MASK) == MFR_CTRL_FRAME && p[1] == 0) {
 382         printf("FRF.16 Control, %s, length %u",
 383                tok2str(mfr_ctrl_msg_values,"Unknown Message (0x%02x)",p[2]),
 384                length);
 385         tptr = p + 3;
 386         tlen = length -3;
 387         hdr_len = 3;
 388
 389         if (!vflag)
 390             return hdr_len;
 391
 392         while (tlen>sizeof(struct ie_tlv_header_t)) {
 393             TCHECK2(*tptr, sizeof(struct ie_tlv_header_t));
 394             ie_type=tptr[0];
 395             ie_len=tptr[1];
 396
 397             printf("\n\tIE %s (%u), length %u: ",
 398                    tok2str(mfr_ctrl_ie_values,"Unknown",ie_type),
 399                    ie_type,
 400                    ie_len);
 401
 402             /* infinite loop check */
 403             if (ie_type == 0 || ie_len <= sizeof(struct ie_tlv_header_t))
 404                 return hdr_len;
 405
 406             TCHECK2(*tptr,ie_len);
 407             tptr+=sizeof(struct ie_tlv_header_t);
 408             /* tlv len includes header */
 409             ie_len-=sizeof(struct ie_tlv_header_t);
 410             tlen-=sizeof(struct ie_tlv_header_t);
 411
 412             switch (ie_type) {
 413
 414             case MFR_CTRL_IE_MAGIC_NUM:
 415                 printf("0x%08x",EXTRACT_32BITS(tptr));
 416                 break;
 417
 418             case MFR_CTRL_IE_BUNDLE_ID: /* same message format */
 419             case MFR_CTRL_IE_LINK_ID:
 420                 for (idx = 0; idx < ie_len && idx < MFR_ID_STRING_MAXLEN; idx++)
 421                     safeputchar(*(tptr+idx));
 422                 break;
 423
 424             case MFR_CTRL_IE_TIMESTAMP:
 425                 if (ie_len == sizeof(struct timeval)) {
 426                     ts_print((const struct timeval *)tptr);
 427                     break;
 428                 }
 429                 /* fall through and hexdump if no unix timestamp */
 430
 431                 /*
 432                  * FIXME those are the defined IEs that lack a decoder
 433                  * you are welcome to contribute code ;-)
 434                  */
 435
 436             case MFR_CTRL_IE_VENDOR_EXT:
 437             case MFR_CTRL_IE_CAUSE:
 438
 439             default:
 440                 if (vflag <= 1)
 441                     print_unknown_data(tptr,"\n\t  ",ie_len);
 442                 break;
 443             }
 444
 445             /* do we want to see a hexdump of the IE ? */
 446             if (vflag > 1 )
 447                 print_unknown_data(tptr,"\n\t  ",ie_len);
 448
 449             tlen-=ie_len;
 450             tptr+=ie_len;
 451         }
 452         return hdr_len;
 453     }
 454 /*
 455  * FRF.16 Fragmentation Frame
 456  *
 457  *      7    6    5    4    3    2    1    0
 458  *    +----+----+----+----+----+----+----+----+
 459  *    | B  | E  | C=0|seq. (high 4 bits) | EA  |
 460  *    +----+----+----+----+----+----+----+----+
 461  *    |        sequence  (low 8 bits)         |
 462  *    +----+----+----+----+----+----+----+----+
 463  *    |        DLCI (6 bits)        | CR | EA  |
 464  *    +----+----+----+----+----+----+----+----+
 465  *    |   DLCI (4 bits)   |FECN|BECN| DE | EA |
 466  *    +----+----+----+----+----+----+----+----+
 467  */
 468
 469     if ((p[0] & MFR_BEC_MASK) == MFR_FRAG_FRAME) {
 470         sequence_num = (p[0]&0x1e)<<7 | p[1];
 471         if (eflag)
 472             printf("FRF.16 Frag, seq %u, ", sequence_num);
 473         hdr_len = 2;
 474         fr_print(p+hdr_len,length-hdr_len);
 475     }
 476
 477     return hdr_len;
 478
 479  trunc:
 480     printf("[|mfr]");
 481     return length;
 482 }
 483
 484 /* an NLPID of 0xb1 indicates a 2-byte
 485  * FRF.15 header
 486  *
 487  *      7    6    5    4    3    2    1    0
 488  *    +----+----+----+----+----+----+----+----+
 489  *    ~              Q.922 header             ~
 490  *    +----+----+----+----+----+----+----+----+
 491  *    |             NLPID (8 bits)            | NLPID=0xb1
 492  *    +----+----+----+----+----+----+----+----+
 493  *    | B  | E  | C  |seq. (high 4 bits) | R  |
 494  *    +----+----+----+----+----+----+----+----+
 495  *    |        sequence  (low 8 bits)         |
 496  *    +----+----+----+----+----+----+----+----+
 497  */
 498
 499 struct tok frf15_flag_values[] = {
 500     { 0x80, "Begin" },
 501     { 0x40, "End" },
 502     { 0x20, "Control" },
 503     { 0, NULL }
 504 };
 505
 506 #define FR_FRF15_FRAGTYPE 0x01
 507
 508 static void
 509 frf15_print (const u_char *p, u_int length) {
 510
 511     u_int16_t sequence_num, flags;
 512
 513     flags = p[0]&0xe0;
 514     sequence_num = (p[0]&0x1e)<<7 | p[1];
 515
 516     printf("FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u",
 517            sequence_num,
 518            bittok2str(frf15_flag_values,"none",flags),
 519            flags&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End",
 520            length);
 521
 522 /* TODO:
 523  * depending on all permutations of the B, E and C bit
 524  * dig as deep as we can - e.g. on the first (B) fragment
 525  * there is enough payload to print the IP header
 526  * on non (B) fragments it depends if the fragmentation
 527  * model is end-to-end or interface based wether we want to print
 528  * another Q.922 header
 529  */
 530
 531 }
 532
 533 /*
 534  * Q.933 decoding portion for framerelay specific.
 535  */
 536
 537 /* Q.933 packet format
 538                       Format of Other Protocols
 539                           using Q.933 NLPID
 540                   +-------------------------------+
 541                   |        Q.922 Address          |
 542                   +---------------+---------------+
 543                   |Control  0x03  | NLPID   0x08  |
 544                   +---------------+---------------+
 545                   |          L2 Protocol ID       |
 546                   | octet 1       |  octet 2      |
 547                   +-------------------------------+
 548                   |          L3 Protocol ID       |
 549                   | octet 2       |  octet 2      |
 550                   +-------------------------------+
 551                   |         Protocol Data         |
 552                   +-------------------------------+
 553                   | FCS                           |
 554                   +-------------------------------+
 555  */
 556
 557 /* L2 (Octet 1)- Call Reference Usually is 0x0 */
 558
 559 /*
 560  * L2 (Octet 2)- Message Types definition 1 byte long.
 561  */
 562 /* Call Establish */
 563 #define MSG_TYPE_ESC_TO_NATIONAL  0x00
 564 #define MSG_TYPE_ALERT            0x01
 565 #define MSG_TYPE_CALL_PROCEEDING  0x02
 566 #define MSG_TYPE_CONNECT          0x07
 567 #define MSG_TYPE_CONNECT_ACK      0x0F
 568 #define MSG_TYPE_PROGRESS         0x03
 569 #define MSG_TYPE_SETUP            0x05
 570 /* Call Clear */
 571 #define MSG_TYPE_DISCONNECT       0x45
 572 #define MSG_TYPE_RELEASE          0x4D
 573 #define MSG_TYPE_RELEASE_COMPLETE 0x5A
 574 #define MSG_TYPE_RESTART          0x46
 575 #define MSG_TYPE_RESTART_ACK      0x4E
 576 /* Status */
 577 #define MSG_TYPE_STATUS           0x7D
 578 #define MSG_TYPE_STATUS_ENQ       0x75
 579
 580 struct tok fr_q933_msg_values[] = {
 581     { MSG_TYPE_ESC_TO_NATIONAL, "ESC to National" },
 582     { MSG_TYPE_ALERT, "Alert" },
 583     { MSG_TYPE_CALL_PROCEEDING, "Call proceeding" },
 584     { MSG_TYPE_CONNECT, "Connect" },
 585     { MSG_TYPE_CONNECT_ACK, "Connect ACK" },
 586     { MSG_TYPE_PROGRESS, "Progress" },
 587     { MSG_TYPE_SETUP, "Setup" },
 588     { MSG_TYPE_DISCONNECT, "Disconnect" },
 589     { MSG_TYPE_RELEASE, "Release" },
 590     { MSG_TYPE_RELEASE_COMPLETE, "Release Complete" },
 591     { MSG_TYPE_RESTART, "Restart" },
 592     { MSG_TYPE_RESTART_ACK, "Restart ACK" },
 593     { MSG_TYPE_STATUS, "Status Reply" },
 594     { MSG_TYPE_STATUS_ENQ, "Status Enquiry" },
 595     { 0, NULL }
 596 };
 597
 598 #define MSG_ANSI_LOCKING_SHIFT  0x95
 599
 600 #define FR_LMI_ANSI_REPORT_TYPE_IE      0x01
 601 #define FR_LMI_ANSI_LINK_VERIFY_IE_91   0x19 /* details? */
 602 #define FR_LMI_ANSI_LINK_VERIFY_IE      0x03
 603 #define FR_LMI_ANSI_PVC_STATUS_IE       0x07
 604
 605 #define FR_LMI_CCITT_REPORT_TYPE_IE     0x51
 606 #define FR_LMI_CCITT_LINK_VERIFY_IE     0x53
 607 #define FR_LMI_CCITT_PVC_STATUS_IE      0x57
 608
 609 struct tok fr_q933_ie_values_codeset5[] = {
 610     { FR_LMI_ANSI_REPORT_TYPE_IE, "ANSI Report Type" },
 611     { FR_LMI_ANSI_LINK_VERIFY_IE_91, "ANSI Link Verify" },
 612     { FR_LMI_ANSI_LINK_VERIFY_IE, "ANSI Link Verify" },
 613     { FR_LMI_ANSI_PVC_STATUS_IE, "ANSI PVC Status" },
 614     { FR_LMI_CCITT_REPORT_TYPE_IE, "CCITT Report Type" },
 615     { FR_LMI_CCITT_LINK_VERIFY_IE, "CCITT Link Verify" },
 616     { FR_LMI_CCITT_PVC_STATUS_IE, "CCITT PVC Status" },
 617     { 0, NULL }
 618 };
 619
 620 #define FR_LMI_REPORT_TYPE_IE_FULL_STATUS 0
 621 #define FR_LMI_REPORT_TYPE_IE_LINK_VERIFY 1
 622 #define FR_LMI_REPORT_TYPE_IE_ASYNC_PVC   2
 623
 624 struct tok fr_lmi_report_type_ie_values[] = {
 625     { FR_LMI_REPORT_TYPE_IE_FULL_STATUS, "Full Status" },
 626     { FR_LMI_REPORT_TYPE_IE_LINK_VERIFY, "Link verify" },
 627     { FR_LMI_REPORT_TYPE_IE_ASYNC_PVC, "Async PVC Status" },
 628     { 0, NULL }
 629 };
 630
 631 /* array of 16 codepages - currently we only support codepage 1,5 */
 632 static struct tok *fr_q933_ie_codesets[] = {
 633     NULL,
 634     fr_q933_ie_values_codeset5,
 635     NULL,
 636     NULL,
 637     NULL,
 638     fr_q933_ie_values_codeset5,
 639     NULL,
 640     NULL,
 641     NULL,
 642     NULL,
 643     NULL,
 644     NULL,
 645     NULL,
 646     NULL,
 647     NULL,
 648     NULL
 649 };
 650
 651 static int fr_q933_print_ie_codeset5(const struct ie_tlv_header_t  *ie_p,
 652     const u_char *p);
 653
 654 typedef int (*codeset_pr_func_t)(const struct ie_tlv_header_t  *ie_p,
 655     const u_char *p);
 656
 657 /* array of 16 codepages - currently we only support codepage 1,5 */
 658 static codeset_pr_func_t fr_q933_print_ie_codeset[] = {
 659     NULL,
 660     fr_q933_print_ie_codeset5,
 661     NULL,
 662     NULL,
 663     NULL,
 664     fr_q933_print_ie_codeset5,
 665     NULL,
 666     NULL,
 667     NULL,
 668     NULL,
 669     NULL,
 670     NULL,
 671     NULL,
 672     NULL,
 673     NULL,
 674     NULL
 675 };
 676
 677 void
 678 q933_print(const u_char *p, u_int length)
 679 {
 680         const u_char *ptemp = p;
 681         struct ie_tlv_header_t  *ie_p;
 682         int olen;
 683         int is_ansi = 0;
 684         u_int codeset;
 685         u_int ie_is_known = 0;
 686
 687         if (length < 9) {       /* shortest: Q.933a LINK VERIFY */
 688                 printf("[|q.933]");
 689                 return;
 690         }
 691
 692         codeset = p[2]&0x0f;   /* extract the codeset */
 693
 694         if (p[2] == MSG_ANSI_LOCKING_SHIFT)
 695                 is_ansi = 1;
 696
 697         printf("%s", eflag ? "" : "Q.933, ");
 698
 699         /* printing out header part */
 700         printf("%s, codeset %u", is_ansi ? "ANSI" : "CCITT", codeset);
 701
 702         if (p[0])
 703                 printf(", Call Ref: 0x%02x", p[0]);
 704
 705         if (vflag)
 706             printf(", %s (0x%02x), length %u",
 707                    tok2str(fr_q933_msg_values,"unknown message",p[1]),
 708                    p[1],
 709                    length);
 710         else
 711             printf(", %s",
 712                    tok2str(fr_q933_msg_values,"unknown message 0x%02x",p[1]));
 713
 714         olen = length; /* preserve the original length for non verbose mode */
 715
 716         if (length < (u_int)(2 - is_ansi)) {
 717                 printf("[|q.933]");
 718                 return;
 719         }
 720         length -= 2 - is_ansi;
 721         ptemp += 2 + is_ansi;
 722
 723         /* Loop through the rest of IE */
 724         while (length > sizeof(struct ie_tlv_header_t )) {
 725                 ie_p = (struct ie_tlv_header_t  *)ptemp;
 726                 if (length < sizeof(struct ie_tlv_header_t ) ||
 727                     length < sizeof(struct ie_tlv_header_t ) + ie_p->ie_len) {
 728                     if (vflag) /* not bark if there is just a trailer */
 729                         printf("\n[|q.933]");
 730                     else
 731                         printf(", length %u",olen);
 732                     return;
 733                 }
 734
 735                 /* lets do the full IE parsing only in verbose mode
 736                  * however some IEs (DLCI Status, Link Verify)
 737                  * are also intereststing in non-verbose mode */
 738                 if (vflag)
 739                     printf("\n\t%s IE (0x%02x), length %u: ",
 740                            tok2str(fr_q933_ie_codesets[codeset],"unknown",ie_p->ie_type),
 741                            ie_p->ie_type,
 742                            ie_p->ie_len);
 743
 744                 /* sanity check */
 745                 if (ie_p->ie_type == 0 || ie_p->ie_len == 0)
 746                     return;
 747
 748                 if (fr_q933_print_ie_codeset[codeset] != NULL)
 749                     ie_is_known = fr_q933_print_ie_codeset[codeset](ie_p, ptemp);
 750
 751                 if (vflag >= 1 && !ie_is_known)
 752                     print_unknown_data(ptemp+2,"\n\t",ie_p->ie_len);
 753
 754                 /* do we want to see a hexdump of the IE ? */
 755                 if (vflag> 1 && ie_is_known)
 756                     print_unknown_data(ptemp+2,"\n\t  ",ie_p->ie_len);
 757
 758                 length = length - ie_p->ie_len - 2;
 759                 ptemp = ptemp + ie_p->ie_len + 2;
 760         }
 761         if (!vflag)
 762             printf(", length %u",olen);
 763 }
 764
 765 static int
 766 fr_q933_print_ie_codeset5(const struct ie_tlv_header_t  *ie_p, const u_char *p)
 767 {
 768         u_int dlci;
 769
 770         switch (ie_p->ie_type) {
 771
 772         case FR_LMI_ANSI_REPORT_TYPE_IE: /* fall through */
 773         case FR_LMI_CCITT_REPORT_TYPE_IE:
 774             if (vflag)
 775                 printf("%s (%u)",
 776                        tok2str(fr_lmi_report_type_ie_values,"unknown",p[2]),
 777                        p[2]);
 778             return 1;
 779
 780         case FR_LMI_ANSI_LINK_VERIFY_IE: /* fall through */
 781         case FR_LMI_CCITT_LINK_VERIFY_IE:
 782         case FR_LMI_ANSI_LINK_VERIFY_IE_91:
 783             if (!vflag)
 784                 printf(", ");
 785             printf("TX Seq: %3d, RX Seq: %3d", p[2], p[3]);
 786             return 1;
 787
 788         case FR_LMI_ANSI_PVC_STATUS_IE: /* fall through */
 789         case FR_LMI_CCITT_PVC_STATUS_IE:
 790             if (!vflag)
 791                 printf(", ");
 792             /* now parse the DLCI information element. */
 793             if ((ie_p->ie_len < 3) ||
 794                 (p[2] & 0x80) ||
 795                 ((ie_p->ie_len == 3) && !(p[3] & 0x80)) ||
 796                 ((ie_p->ie_len == 4) && ((p[3] & 0x80) || !(p[4] & 0x80))) ||
 797                 ((ie_p->ie_len == 5) && ((p[3] & 0x80) || (p[4] & 0x80) ||
 798                                    !(p[5] & 0x80))) ||
 799                 (ie_p->ie_len > 5) ||
 800                 !(p[ie_p->ie_len + 1] & 0x80))
 801                 printf("Invalid DLCI IE");
 802
 803             dlci = ((p[2] & 0x3F) << 4) | ((p[3] & 0x78) >> 3);
 804             if (ie_p->ie_len == 4)
 805                 dlci = (dlci << 6) | ((p[4] & 0x7E) >> 1);
 806             else if (ie_p->ie_len == 5)
 807                 dlci = (dlci << 13) | (p[4] & 0x7F) | ((p[5] & 0x7E) >> 1);
 808
 809             printf("DLCI %u: status %s%s", dlci,
 810                     p[ie_p->ie_len + 1] & 0x8 ? "New, " : "",
 811                     p[ie_p->ie_len + 1] & 0x2 ? "Active" : "Inactive");
 812             return 1;
 813         }
 814
 815         return 0;
 816 }