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 1.51 2006-06-23 22:20:32 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 static const 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 /* FRF.15 / FRF.16 */ 86 #define MFR_B_BIT 0x80 87 #define MFR_E_BIT 0x40 88 #define MFR_C_BIT 0x20 89 #define MFR_BEC_MASK (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT) 90 #define MFR_CTRL_FRAME (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT) 91 #define MFR_FRAG_FRAME (MFR_B_BIT | MFR_E_BIT ) 92 93 static const struct tok frf_flag_values[] = { 94 { MFR_B_BIT, "Begin" }, 95 { MFR_E_BIT, "End" }, 96 { MFR_C_BIT, "Control" }, 97 { 0, NULL } 98 }; 99 100 /* Finds out Q.922 address length, DLCI and flags. Returns 0 on success 101 * save the flags dep. on address length 102 */ 103 static int parse_q922_addr(const u_char *p, u_int *dlci, 104 u_int *addr_len, u_int8_t *flags) 105 { 106 if ((p[0] & FR_EA_BIT)) 107 return -1; 108 109 *addr_len = 2; 110 *dlci = ((p[0] & 0xFC) << 2) | ((p[1] & 0xF0) >> 4); 111 112 flags[0] = p[0] & 0x02; /* populate the first flag fields */ 113 flags[1] = p[1] & 0x0c; 114 flags[2] = 0; /* clear the rest of the flags */ 115 flags[3] = 0; 116 117 if (p[1] & FR_EA_BIT) 118 return 0; /* 2-byte Q.922 address */ 119 120 p += 2; 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 */ 125 p++; 126 } 127 128 if ((p[0] & FR_EA_BIT) == 0) 129 return -1; /* more than 4 bytes of Q.922 address? */ 130 131 flags[3] = p[0] & 0x02; 132 133 *dlci = (*dlci << 6) | (p[0] >> 2); 134 135 return 0; 136 } 137 138 char *q922_string(const u_char *p) { 139 140 static u_int dlci, addr_len; 141 static u_int8_t flags[4]; 142 static char buffer[sizeof("DLCI xxxxxxxxxx")]; 143 memset(buffer, 0, sizeof(buffer)); 144 145 if (parse_q922_addr(p, &dlci, &addr_len, flags) == 0){ 146 snprintf(buffer, sizeof(buffer), "DLCI %u", dlci); 147 } 148 149 return buffer; 150 } 151 152 153 /* Frame Relay packet structure, with flags and CRC removed 154 155 +---------------------------+ 156 | Q.922 Address* | 157 +-- --+ 158 | | 159 +---------------------------+ 160 | Control (UI = 0x03) | 161 +---------------------------+ 162 | Optional Pad (0x00) | 163 +---------------------------+ 164 | NLPID | 165 +---------------------------+ 166 | . | 167 | . | 168 | . | 169 | Data | 170 | . | 171 | . | 172 +---------------------------+ 173 174 * Q.922 addresses, as presently defined, are two octets and 175 contain a 10-bit DLCI. In some networks Q.922 addresses 176 may optionally be increased to three or four octets. 177 */ 178 179 static u_int 180 fr_hdrlen(const u_char *p, u_int addr_len) 181 { 182 if (!p[addr_len + 1] /* pad exist */) 183 return addr_len + 1 /* UI */ + 1 /* pad */ + 1 /* NLPID */; 184 else 185 return addr_len + 1 /* UI */ + 1 /* NLPID */; 186 } 187 188 static void 189 fr_hdr_print(int length, u_int addr_len, u_int dlci, u_int8_t *flags, u_int16_t nlpid) 190 { 191 if (qflag) { 192 (void)printf("Q.922, DLCI %u, length %u: ", 193 dlci, 194 length); 195 } else { 196 if (nlpid <= 0xff) /* if its smaller than 256 then its a NLPID */ 197 (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], NLPID %s (0x%02x), length %u: ", 198 addr_len, 199 dlci, 200 bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)), 201 tok2str(nlpid_values,"unknown", nlpid), 202 nlpid, 203 length); 204 else /* must be an ethertype */ 205 (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], cisco-ethertype %s (0x%04x), length %u: ", 206 addr_len, 207 dlci, 208 bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)), 209 tok2str(ethertype_values, "unknown", nlpid), 210 nlpid, 211 length); 212 } 213 } 214 215 u_int 216 fr_if_print(const struct pcap_pkthdr *h, register const u_char *p) 217 { 218 register u_int length = h->len; 219 register u_int caplen = h->caplen; 220 221 TCHECK2(*p, 4); /* minimum frame header length */ 222 223 if ((length = fr_print(p, length)) == 0) 224 return (0); 225 else 226 return length; 227 trunc: 228 printf("[|fr]"); 229 return caplen; 230 } 231 232 u_int 233 fr_print(register const u_char *p, u_int length) 234 { 235 u_int16_t extracted_ethertype; 236 u_int dlci; 237 u_int addr_len; 238 u_int16_t nlpid; 239 u_int hdr_len; 240 u_int8_t flags[4]; 241 242 if (parse_q922_addr(p, &dlci, &addr_len, flags)) { 243 printf("Q.922, invalid address"); 244 return 0; 245 } 246 247 TCHECK2(*p,addr_len+1+1); 248 hdr_len = fr_hdrlen(p, addr_len); 249 TCHECK2(*p,hdr_len); 250 251 if (p[addr_len] != 0x03 && dlci != 0) { 252 253 /* lets figure out if we have cisco style encapsulation: */ 254 extracted_ethertype = EXTRACT_16BITS(p+addr_len); 255 256 if (eflag) 257 fr_hdr_print(length, addr_len, dlci, flags, extracted_ethertype); 258 259 if (ethertype_print(gndo, extracted_ethertype, 260 p+addr_len+ETHERTYPE_LEN, 261 length-addr_len-ETHERTYPE_LEN, 262 length-addr_len-ETHERTYPE_LEN) == 0) 263 /* ether_type not known, probably it wasn't one */ 264 printf("UI %02x! ", p[addr_len]); 265 else 266 return hdr_len; 267 } 268 269 if (!p[addr_len + 1]) { /* pad byte should be used with 3-byte Q.922 */ 270 if (addr_len != 3) 271 printf("Pad! "); 272 } else if (addr_len == 3) 273 printf("No pad! "); 274 275 nlpid = p[hdr_len - 1]; 276 277 if (eflag) 278 fr_hdr_print(length, addr_len, dlci, flags, nlpid); 279 p += hdr_len; 280 length -= hdr_len; 281 282 switch (nlpid) { 283 case NLPID_IP: 284 ip_print(gndo, p, length); 285 break; 286 287 #ifdef INET6 288 case NLPID_IP6: 289 ip6_print(gndo, p, length); 290 break; 291 #endif 292 case NLPID_CLNP: 293 case NLPID_ESIS: 294 case NLPID_ISIS: 295 isoclns_print(p-1, length+1, length+1); /* OSI printers need the NLPID field */ 296 break; 297 298 case NLPID_SNAP: 299 if (snap_print(p, length, length, 0) == 0) { 300 /* ether_type not known, print raw packet */ 301 if (!eflag) 302 fr_hdr_print(length + hdr_len, hdr_len, 303 dlci, flags, nlpid); 304 if (!suppress_default_print) 305 default_print(p - hdr_len, length + hdr_len); 306 } 307 break; 308 309 case NLPID_Q933: 310 q933_print(p, length); 311 break; 312 313 case NLPID_MFR: 314 frf15_print(p, length); 315 break; 316 317 case NLPID_PPP: 318 ppp_print(p, length); 319 break; 320 321 default: 322 if (!eflag) 323 fr_hdr_print(length + hdr_len, addr_len, 324 dlci, flags, nlpid); 325 if (!xflag) 326 default_print(p, length); 327 } 328 329 return hdr_len; 330 331 trunc: 332 printf("[|fr]"); 333 return 0; 334 335 } 336 337 u_int 338 mfr_if_print(const struct pcap_pkthdr *h, register const u_char *p) 339 { 340 register u_int length = h->len; 341 register u_int caplen = h->caplen; 342 343 TCHECK2(*p, 2); /* minimum frame header length */ 344 345 if ((length = mfr_print(p, length)) == 0) 346 return (0); 347 else 348 return length; 349 trunc: 350 printf("[|mfr]"); 351 return caplen; 352 } 353 354 355 #define MFR_CTRL_MSG_ADD_LINK 1 356 #define MFR_CTRL_MSG_ADD_LINK_ACK 2 357 #define MFR_CTRL_MSG_ADD_LINK_REJ 3 358 #define MFR_CTRL_MSG_HELLO 4 359 #define MFR_CTRL_MSG_HELLO_ACK 5 360 #define MFR_CTRL_MSG_REMOVE_LINK 6 361 #define MFR_CTRL_MSG_REMOVE_LINK_ACK 7 362 363 static const struct tok mfr_ctrl_msg_values[] = { 364 { MFR_CTRL_MSG_ADD_LINK, "Add Link" }, 365 { MFR_CTRL_MSG_ADD_LINK_ACK, "Add Link ACK" }, 366 { MFR_CTRL_MSG_ADD_LINK_REJ, "Add Link Reject" }, 367 { MFR_CTRL_MSG_HELLO, "Hello" }, 368 { MFR_CTRL_MSG_HELLO_ACK, "Hello ACK" }, 369 { MFR_CTRL_MSG_REMOVE_LINK, "Remove Link" }, 370 { MFR_CTRL_MSG_REMOVE_LINK_ACK, "Remove Link ACK" }, 371 { 0, NULL } 372 }; 373 374 #define MFR_CTRL_IE_BUNDLE_ID 1 375 #define MFR_CTRL_IE_LINK_ID 2 376 #define MFR_CTRL_IE_MAGIC_NUM 3 377 #define MFR_CTRL_IE_TIMESTAMP 5 378 #define MFR_CTRL_IE_VENDOR_EXT 6 379 #define MFR_CTRL_IE_CAUSE 7 380 381 static const struct tok mfr_ctrl_ie_values[] = { 382 { MFR_CTRL_IE_BUNDLE_ID, "Bundle ID"}, 383 { MFR_CTRL_IE_LINK_ID, "Link ID"}, 384 { MFR_CTRL_IE_MAGIC_NUM, "Magic Number"}, 385 { MFR_CTRL_IE_TIMESTAMP, "Timestamp"}, 386 { MFR_CTRL_IE_VENDOR_EXT, "Vendor Extension"}, 387 { MFR_CTRL_IE_CAUSE, "Cause"}, 388 { 0, NULL } 389 }; 390 391 #define MFR_ID_STRING_MAXLEN 50 392 393 struct ie_tlv_header_t { 394 u_int8_t ie_type; 395 u_int8_t ie_len; 396 }; 397 398 u_int 399 mfr_print(register const u_char *p, u_int length) 400 { 401 u_int tlen,idx,hdr_len = 0; 402 u_int16_t sequence_num; 403 u_int8_t ie_type,ie_len; 404 const u_int8_t *tptr; 405 406 407 /* 408 * FRF.16 Link Integrity Control Frame 409 * 410 * 7 6 5 4 3 2 1 0 411 * +----+----+----+----+----+----+----+----+ 412 * | B | E | C=1| 0 0 0 0 | EA | 413 * +----+----+----+----+----+----+----+----+ 414 * | 0 0 0 0 0 0 0 0 | 415 * +----+----+----+----+----+----+----+----+ 416 * | message type | 417 * +----+----+----+----+----+----+----+----+ 418 */ 419 420 TCHECK2(*p, 4); /* minimum frame header length */ 421 422 if ((p[0] & MFR_BEC_MASK) == MFR_CTRL_FRAME && p[1] == 0) { 423 printf("FRF.16 Control, Flags [%s], %s, length %u", 424 bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK)), 425 tok2str(mfr_ctrl_msg_values,"Unknown Message (0x%02x)",p[2]), 426 length); 427 tptr = p + 3; 428 tlen = length -3; 429 hdr_len = 3; 430 431 if (!vflag) 432 return hdr_len; 433 434 while (tlen>sizeof(struct ie_tlv_header_t)) { 435 TCHECK2(*tptr, sizeof(struct ie_tlv_header_t)); 436 ie_type=tptr[0]; 437 ie_len=tptr[1]; 438 439 printf("\n\tIE %s (%u), length %u: ", 440 tok2str(mfr_ctrl_ie_values,"Unknown",ie_type), 441 ie_type, 442 ie_len); 443 444 /* infinite loop check */ 445 if (ie_type == 0 || ie_len <= sizeof(struct ie_tlv_header_t)) 446 return hdr_len; 447 448 TCHECK2(*tptr,ie_len); 449 tptr+=sizeof(struct ie_tlv_header_t); 450 /* tlv len includes header */ 451 ie_len-=sizeof(struct ie_tlv_header_t); 452 tlen-=sizeof(struct ie_tlv_header_t); 453 454 switch (ie_type) { 455 456 case MFR_CTRL_IE_MAGIC_NUM: 457 printf("0x%08x",EXTRACT_32BITS(tptr)); 458 break; 459 460 case MFR_CTRL_IE_BUNDLE_ID: /* same message format */ 461 case MFR_CTRL_IE_LINK_ID: 462 for (idx = 0; idx < ie_len && idx < MFR_ID_STRING_MAXLEN; idx++) { 463 if (*(tptr+idx) != 0) /* don't print null termination */ 464 safeputchar(*(tptr+idx)); 465 else 466 break; 467 } 468 break; 469 470 case MFR_CTRL_IE_TIMESTAMP: 471 if (ie_len == sizeof(struct timeval)) { 472 ts_print((const struct timeval *)tptr); 473 break; 474 } 475 /* fall through and hexdump if no unix timestamp */ 476 477 /* 478 * FIXME those are the defined IEs that lack a decoder 479 * you are welcome to contribute code ;-) 480 */ 481 482 case MFR_CTRL_IE_VENDOR_EXT: 483 case MFR_CTRL_IE_CAUSE: 484 485 default: 486 if (vflag <= 1) 487 print_unknown_data(tptr,"\n\t ",ie_len); 488 break; 489 } 490 491 /* do we want to see a hexdump of the IE ? */ 492 if (vflag > 1 ) 493 print_unknown_data(tptr,"\n\t ",ie_len); 494 495 tlen-=ie_len; 496 tptr+=ie_len; 497 } 498 return hdr_len; 499 } 500 /* 501 * FRF.16 Fragmentation Frame 502 * 503 * 7 6 5 4 3 2 1 0 504 * +----+----+----+----+----+----+----+----+ 505 * | B | E | C=0|seq. (high 4 bits) | EA | 506 * +----+----+----+----+----+----+----+----+ 507 * | sequence (low 8 bits) | 508 * +----+----+----+----+----+----+----+----+ 509 * | DLCI (6 bits) | CR | EA | 510 * +----+----+----+----+----+----+----+----+ 511 * | DLCI (4 bits) |FECN|BECN| DE | EA | 512 * +----+----+----+----+----+----+----+----+ 513 */ 514 515 sequence_num = (p[0]&0x1e)<<7 | p[1]; 516 /* whole packet or first fragment ? */ 517 if ((p[0] & MFR_BEC_MASK) == MFR_FRAG_FRAME || 518 (p[0] & MFR_BEC_MASK) == MFR_B_BIT) { 519 printf("FRF.16 Frag, seq %u, Flags [%s], ", 520 sequence_num, 521 bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK))); 522 hdr_len = 2; 523 fr_print(p+hdr_len,length-hdr_len); 524 return hdr_len; 525 } 526 527 /* must be a middle or the last fragment */ 528 printf("FRF.16 Frag, seq %u, Flags [%s]", 529 sequence_num, 530 bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK))); 531 print_unknown_data(p,"\n\t",length); 532 533 return hdr_len; 534 535 trunc: 536 printf("[|mfr]"); 537 return length; 538 } 539 540 /* an NLPID of 0xb1 indicates a 2-byte 541 * FRF.15 header 542 * 543 * 7 6 5 4 3 2 1 0 544 * +----+----+----+----+----+----+----+----+ 545 * ~ Q.922 header ~ 546 * +----+----+----+----+----+----+----+----+ 547 * | NLPID (8 bits) | NLPID=0xb1 548 * +----+----+----+----+----+----+----+----+ 549 * | B | E | C |seq. (high 4 bits) | R | 550 * +----+----+----+----+----+----+----+----+ 551 * | sequence (low 8 bits) | 552 * +----+----+----+----+----+----+----+----+ 553 */ 554 555 #define FR_FRF15_FRAGTYPE 0x01 556 557 static void 558 frf15_print (const u_char *p, u_int length) { 559 560 u_int16_t sequence_num, flags; 561 562 flags = p[0]&MFR_BEC_MASK; 563 sequence_num = (p[0]&0x1e)<<7 | p[1]; 564 565 printf("FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u", 566 sequence_num, 567 bittok2str(frf_flag_values,"none",flags), 568 p[0]&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End", 569 length); 570 571 /* TODO: 572 * depending on all permutations of the B, E and C bit 573 * dig as deep as we can - e.g. on the first (B) fragment 574 * there is enough payload to print the IP header 575 * on non (B) fragments it depends if the fragmentation 576 * model is end-to-end or interface based wether we want to print 577 * another Q.922 header 578 */ 579 580 } 581 582 /* 583 * Q.933 decoding portion for framerelay specific. 584 */ 585 586 /* Q.933 packet format 587 Format of Other Protocols 588 using Q.933 NLPID 589 +-------------------------------+ 590 | Q.922 Address | 591 +---------------+---------------+ 592 |Control 0x03 | NLPID 0x08 | 593 +---------------+---------------+ 594 | L2 Protocol ID | 595 | octet 1 | octet 2 | 596 +-------------------------------+ 597 | L3 Protocol ID | 598 | octet 2 | octet 2 | 599 +-------------------------------+ 600 | Protocol Data | 601 +-------------------------------+ 602 | FCS | 603 +-------------------------------+ 604 */ 605 606 /* L2 (Octet 1)- Call Reference Usually is 0x0 */ 607 608 /* 609 * L2 (Octet 2)- Message Types definition 1 byte long. 610 */ 611 /* Call Establish */ 612 #define MSG_TYPE_ESC_TO_NATIONAL 0x00 613 #define MSG_TYPE_ALERT 0x01 614 #define MSG_TYPE_CALL_PROCEEDING 0x02 615 #define MSG_TYPE_CONNECT 0x07 616 #define MSG_TYPE_CONNECT_ACK 0x0F 617 #define MSG_TYPE_PROGRESS 0x03 618 #define MSG_TYPE_SETUP 0x05 619 /* Call Clear */ 620 #define MSG_TYPE_DISCONNECT 0x45 621 #define MSG_TYPE_RELEASE 0x4D 622 #define MSG_TYPE_RELEASE_COMPLETE 0x5A 623 #define MSG_TYPE_RESTART 0x46 624 #define MSG_TYPE_RESTART_ACK 0x4E 625 /* Status */ 626 #define MSG_TYPE_STATUS 0x7D 627 #define MSG_TYPE_STATUS_ENQ 0x75 628 629 static const struct tok fr_q933_msg_values[] = { 630 { MSG_TYPE_ESC_TO_NATIONAL, "ESC to National" }, 631 { MSG_TYPE_ALERT, "Alert" }, 632 { MSG_TYPE_CALL_PROCEEDING, "Call proceeding" }, 633 { MSG_TYPE_CONNECT, "Connect" }, 634 { MSG_TYPE_CONNECT_ACK, "Connect ACK" }, 635 { MSG_TYPE_PROGRESS, "Progress" }, 636 { MSG_TYPE_SETUP, "Setup" }, 637 { MSG_TYPE_DISCONNECT, "Disconnect" }, 638 { MSG_TYPE_RELEASE, "Release" }, 639 { MSG_TYPE_RELEASE_COMPLETE, "Release Complete" }, 640 { MSG_TYPE_RESTART, "Restart" }, 641 { MSG_TYPE_RESTART_ACK, "Restart ACK" }, 642 { MSG_TYPE_STATUS, "Status Reply" }, 643 { MSG_TYPE_STATUS_ENQ, "Status Enquiry" }, 644 { 0, NULL } 645 }; 646 647 #define MSG_ANSI_LOCKING_SHIFT 0x95 648 649 #define FR_LMI_ANSI_REPORT_TYPE_IE 0x01 650 #define FR_LMI_ANSI_LINK_VERIFY_IE_91 0x19 /* details? */ 651 #define FR_LMI_ANSI_LINK_VERIFY_IE 0x03 652 #define FR_LMI_ANSI_PVC_STATUS_IE 0x07 653 654 #define FR_LMI_CCITT_REPORT_TYPE_IE 0x51 655 #define FR_LMI_CCITT_LINK_VERIFY_IE 0x53 656 #define FR_LMI_CCITT_PVC_STATUS_IE 0x57 657 658 static const struct tok fr_q933_ie_values_codeset5[] = { 659 { FR_LMI_ANSI_REPORT_TYPE_IE, "ANSI Report Type" }, 660 { FR_LMI_ANSI_LINK_VERIFY_IE_91, "ANSI Link Verify" }, 661 { FR_LMI_ANSI_LINK_VERIFY_IE, "ANSI Link Verify" }, 662 { FR_LMI_ANSI_PVC_STATUS_IE, "ANSI PVC Status" }, 663 { FR_LMI_CCITT_REPORT_TYPE_IE, "CCITT Report Type" }, 664 { FR_LMI_CCITT_LINK_VERIFY_IE, "CCITT Link Verify" }, 665 { FR_LMI_CCITT_PVC_STATUS_IE, "CCITT PVC Status" }, 666 { 0, NULL } 667 }; 668 669 #define FR_LMI_REPORT_TYPE_IE_FULL_STATUS 0 670 #define FR_LMI_REPORT_TYPE_IE_LINK_VERIFY 1 671 #define FR_LMI_REPORT_TYPE_IE_ASYNC_PVC 2 672 673 static const struct tok fr_lmi_report_type_ie_values[] = { 674 { FR_LMI_REPORT_TYPE_IE_FULL_STATUS, "Full Status" }, 675 { FR_LMI_REPORT_TYPE_IE_LINK_VERIFY, "Link verify" }, 676 { FR_LMI_REPORT_TYPE_IE_ASYNC_PVC, "Async PVC Status" }, 677 { 0, NULL } 678 }; 679 680 /* array of 16 codepages - currently we only support codepage 1,5 */ 681 static const struct tok *fr_q933_ie_codesets[] = { 682 NULL, 683 fr_q933_ie_values_codeset5, 684 NULL, 685 NULL, 686 NULL, 687 fr_q933_ie_values_codeset5, 688 NULL, 689 NULL, 690 NULL, 691 NULL, 692 NULL, 693 NULL, 694 NULL, 695 NULL, 696 NULL, 697 NULL 698 }; 699 700 static int fr_q933_print_ie_codeset5(const struct ie_tlv_header_t *ie_p, 701 const u_char *p); 702 703 typedef int (*codeset_pr_func_t)(const struct ie_tlv_header_t *ie_p, 704 const u_char *p); 705 706 /* array of 16 codepages - currently we only support codepage 1,5 */ 707 static codeset_pr_func_t fr_q933_print_ie_codeset[] = { 708 NULL, 709 fr_q933_print_ie_codeset5, 710 NULL, 711 NULL, 712 NULL, 713 fr_q933_print_ie_codeset5, 714 NULL, 715 NULL, 716 NULL, 717 NULL, 718 NULL, 719 NULL, 720 NULL, 721 NULL, 722 NULL, 723 NULL 724 }; 725 726 void 727 q933_print(const u_char *p, u_int length) 728 { 729 const u_char *ptemp = p; 730 struct ie_tlv_header_t *ie_p; 731 int olen; 732 int is_ansi = 0; 733 u_int codeset; 734 u_int ie_is_known = 0; 735 736 if (length < 9) { /* shortest: Q.933a LINK VERIFY */ 737 printf("[|q.933]"); 738 return; 739 } 740 741 codeset = p[2]&0x0f; /* extract the codeset */ 742 743 if (p[2] == MSG_ANSI_LOCKING_SHIFT) { 744 is_ansi = 1; 745 } 746 747 printf("%s", eflag ? "" : "Q.933, "); 748 749 /* printing out header part */ 750 printf("%s, codeset %u", is_ansi ? "ANSI" : "CCITT", codeset); 751 752 if (p[0]) { 753 printf(", Call Ref: 0x%02x", p[0]); 754 } 755 if (vflag) { 756 printf(", %s (0x%02x), length %u", 757 tok2str(fr_q933_msg_values, 758 "unknown message", p[1]), 759 p[1], 760 length); 761 } else { 762 printf(", %s", 763 tok2str(fr_q933_msg_values, 764 "unknown message 0x%02x", p[1])); 765 } 766 767 olen = length; /* preserve the original length for non verbose mode */ 768 769 if (length < (u_int)(2 - is_ansi)) { 770 printf("[|q.933]"); 771 return; 772 } 773 length -= 2 + is_ansi; 774 ptemp += 2 + is_ansi; 775 776 /* Loop through the rest of IE */ 777 while (length > sizeof(struct ie_tlv_header_t)) { 778 ie_p = (struct ie_tlv_header_t *)ptemp; 779 if (length < sizeof(struct ie_tlv_header_t) || 780 length < sizeof(struct ie_tlv_header_t) + ie_p->ie_len) { 781 if (vflag) { /* not bark if there is just a trailer */ 782 printf("\n[|q.933]"); 783 } else { 784 printf(", length %u",olen); 785 } 786 return; 787 } 788 789 /* lets do the full IE parsing only in verbose mode 790 * however some IEs (DLCI Status, Link Verify) 791 * are also interestting in non-verbose mode */ 792 if (vflag) { 793 printf("\n\t%s IE (0x%02x), length %u: ", 794 tok2str(fr_q933_ie_codesets[codeset], 795 "unknown", ie_p->ie_type), 796 ie_p->ie_type, 797 ie_p->ie_len); 798 } 799 800 /* sanity check */ 801 if (ie_p->ie_type == 0 || ie_p->ie_len == 0) { 802 return; 803 } 804 805 if (fr_q933_print_ie_codeset[codeset] != NULL) { 806 ie_is_known = fr_q933_print_ie_codeset[codeset](ie_p, ptemp); 807 } 808 809 if (vflag >= 1 && !ie_is_known) { 810 print_unknown_data(ptemp+2,"\n\t",ie_p->ie_len); 811 } 812 813 /* do we want to see a hexdump of the IE ? */ 814 if (vflag> 1 && ie_is_known) { 815 print_unknown_data(ptemp+2,"\n\t ",ie_p->ie_len); 816 } 817 818 length = length - ie_p->ie_len - 2; 819 ptemp = ptemp + ie_p->ie_len + 2; 820 } 821 if (!vflag) { 822 printf(", length %u",olen); 823 } 824 } 825 826 static int 827 fr_q933_print_ie_codeset5(const struct ie_tlv_header_t *ie_p, const u_char *p) 828 { 829 u_int dlci; 830 831 switch (ie_p->ie_type) { 832 833 case FR_LMI_ANSI_REPORT_TYPE_IE: /* fall through */ 834 case FR_LMI_CCITT_REPORT_TYPE_IE: 835 if (vflag) { 836 printf("%s (%u)", 837 tok2str(fr_lmi_report_type_ie_values,"unknown",p[2]), 838 p[2]); 839 } 840 return 1; 841 842 case FR_LMI_ANSI_LINK_VERIFY_IE: /* fall through */ 843 case FR_LMI_CCITT_LINK_VERIFY_IE: 844 case FR_LMI_ANSI_LINK_VERIFY_IE_91: 845 if (!vflag) { 846 printf(", "); 847 } 848 printf("TX Seq: %3d, RX Seq: %3d", p[2], p[3]); 849 return 1; 850 851 case FR_LMI_ANSI_PVC_STATUS_IE: /* fall through */ 852 case FR_LMI_CCITT_PVC_STATUS_IE: 853 if (!vflag) { 854 printf(", "); 855 } 856 /* now parse the DLCI information element. */ 857 if ((ie_p->ie_len < 3) || 858 (p[2] & 0x80) || 859 ((ie_p->ie_len == 3) && !(p[3] & 0x80)) || 860 ((ie_p->ie_len == 4) && ((p[3] & 0x80) || !(p[4] & 0x80))) || 861 ((ie_p->ie_len == 5) && ((p[3] & 0x80) || (p[4] & 0x80) || 862 !(p[5] & 0x80))) || 863 (ie_p->ie_len > 5) || 864 !(p[ie_p->ie_len + 1] & 0x80)) { 865 printf("Invalid DLCI IE"); 866 } 867 868 dlci = ((p[2] & 0x3F) << 4) | ((p[3] & 0x78) >> 3); 869 if (ie_p->ie_len == 4) { 870 dlci = (dlci << 6) | ((p[4] & 0x7E) >> 1); 871 } 872 else if (ie_p->ie_len == 5) { 873 dlci = (dlci << 13) | (p[4] & 0x7F) | ((p[5] & 0x7E) >> 1); 874 } 875 876 printf("DLCI %u: status %s%s", dlci, 877 p[ie_p->ie_len + 1] & 0x8 ? "New, " : "", 878 p[ie_p->ie_len + 1] & 0x2 ? "Active" : "Inactive"); 879 return 1; 880 } 881 882 return 0; 883 } 884
