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 * $FreeBSD$ 22 */ 23 24 #ifndef lint 25 static const char rcsid[] _U_ = 26 "@(#)$Header: /tcpdump/master/tcpdump/print-fr.c,v 1.51 2006-06-23 22:20:32 hannes Exp $ (LBL)"; 27 #endif 28 29 #ifdef HAVE_CONFIG_H 30 #include "config.h" 31 #endif 32 33 #include <tcpdump-stdinc.h> 34 35 #include <stdio.h> 36 #include <string.h> 37 #include <pcap.h> 38 39 #include "addrtoname.h" 40 #include "interface.h" 41 #include "ethertype.h" 42 #include "nlpid.h" 43 #include "extract.h" 44 #include "oui.h" 45 46 static void frf15_print(const u_char *, u_int); 47 48 /* 49 * the frame relay header has a variable length 50 * 51 * the EA bit determines if there is another byte 52 * in the header 53 * 54 * minimum header length is 2 bytes 55 * maximum header length is 4 bytes 56 * 57 * 7 6 5 4 3 2 1 0 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 * +----+----+----+----+----+----+----+----+ 67 */ 68 69 #define FR_EA_BIT 0x01 70 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 76 77 78 struct tok fr_header_flag_values[] = { 79 { FR_CR_BIT, "C!" }, 80 { FR_DE_BIT, "DE" }, 81 { FR_BECN_BIT, "BECN" }, 82 { FR_FECN_BIT, "FECN" }, 83 { FR_SDLC_BIT, "sdlcore" }, 84 { 0, NULL } 85 }; 86 87 /* FRF.15 / FRF.16 */ 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 ) 94 95 struct tok frf_flag_values[] = { 96 { MFR_B_BIT, "Begin" }, 97 { MFR_E_BIT, "End" }, 98 { MFR_C_BIT, "Control" }, 99 { 0, NULL } 100 }; 101 102 /* Finds out Q.922 address length, DLCI and flags. Returns 0 on success 103 * save the flags dep. on address length 104 */ 105 static int parse_q922_addr(const u_char *p, u_int *dlci, 106 u_int *addr_len, u_int8_t *flags) 107 { 108 if ((p[0] & FR_EA_BIT)) 109 return -1; 110 111 *addr_len = 2; 112 *dlci = ((p[0] & 0xFC) << 2) | ((p[1] & 0xF0) >> 4); 113 114 flags[0] = p[0] & 0x02; /* populate the first flag fields */ 115 flags[1] = p[1] & 0x0c; 116 flags[2] = 0; /* clear the rest of the flags */ 117 flags[3] = 0; 118 119 if (p[1] & FR_EA_BIT) 120 return 0; /* 2-byte Q.922 address */ 121 122 p += 2; 123 (*addr_len)++; /* 3- or 4-byte Q.922 address */ 124 if ((p[0] & FR_EA_BIT) == 0) { 125 *dlci = (*dlci << 7) | (p[0] >> 1); 126 (*addr_len)++; /* 4-byte Q.922 address */ 127 p++; 128 } 129 130 if ((p[0] & FR_EA_BIT) == 0) 131 return -1; /* more than 4 bytes of Q.922 address? */ 132 133 flags[3] = p[0] & 0x02; 134 135 *dlci = (*dlci << 6) | (p[0] >> 2); 136 137 return 0; 138 } 139 140 char *q922_string(const u_char *p) { 141 142 static u_int dlci, addr_len; 143 static u_int8_t flags[4]; 144 static char buffer[sizeof("DLCI xxxxxxxxxx")]; 145 memset(buffer, 0, sizeof(buffer)); 146 147 if (parse_q922_addr(p, &dlci, &addr_len, flags) == 0){ 148 snprintf(buffer, sizeof(buffer), "DLCI %u", dlci); 149 } 150 151 return buffer; 152 } 153 154 155 /* Frame Relay packet structure, with flags and CRC removed 156 157 +---------------------------+ 158 | Q.922 Address* | 159 +-- --+ 160 | | 161 +---------------------------+ 162 | Control (UI = 0x03) | 163 +---------------------------+ 164 | Optional Pad (0x00) | 165 +---------------------------+ 166 | NLPID | 167 +---------------------------+ 168 | . | 169 | . | 170 | . | 171 | Data | 172 | . | 173 | . | 174 +---------------------------+ 175 176 * Q.922 addresses, as presently defined, are two octets and 177 contain a 10-bit DLCI. In some networks Q.922 addresses 178 may optionally be increased to three or four octets. 179 */ 180 181 static u_int 182 fr_hdrlen(const u_char *p, u_int addr_len) 183 { 184 if (!p[addr_len + 1] /* pad exist */) 185 return addr_len + 1 /* UI */ + 1 /* pad */ + 1 /* NLPID */; 186 else 187 return addr_len + 1 /* UI */ + 1 /* NLPID */; 188 } 189 190 static void 191 fr_hdr_print(int length, u_int addr_len, u_int dlci, u_int8_t *flags, u_int16_t nlpid) 192 { 193 if (qflag) { 194 (void)printf("Q.922, DLCI %u, length %u: ", 195 dlci, 196 length); 197 } else { 198 if (nlpid <= 0xff) /* if its smaller than 256 then its a NLPID */ 199 (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], NLPID %s (0x%02x), length %u: ", 200 addr_len, 201 dlci, 202 bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)), 203 tok2str(nlpid_values,"unknown", nlpid), 204 nlpid, 205 length); 206 else /* must be an ethertype */ 207 (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], cisco-ethertype %s (0x%04x), length %u: ", 208 addr_len, 209 dlci, 210 bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)), 211 tok2str(ethertype_values, "unknown", nlpid), 212 nlpid, 213 length); 214 } 215 } 216 217 u_int 218 fr_if_print(const struct pcap_pkthdr *h, register const u_char *p) 219 { 220 register u_int length = h->len; 221 register u_int caplen = h->caplen; 222 223 TCHECK2(*p, 4); /* minimum frame header length */ 224 225 if ((length = fr_print(p, length)) == 0) 226 return (0); 227 else 228 return length; 229 trunc: 230 printf("[|fr]"); 231 return caplen; 232 } 233 234 u_int 235 fr_print(register const u_char *p, u_int length) 236 { 237 u_int16_t extracted_ethertype; 238 u_int dlci; 239 u_int addr_len; 240 u_int16_t nlpid; 241 u_int hdr_len; 242 u_int8_t flags[4]; 243 244 if (parse_q922_addr(p, &dlci, &addr_len, flags)) { 245 printf("Q.922, invalid address"); 246 return 0; 247 } 248 249 TCHECK2(*p,addr_len+1+1); 250 hdr_len = fr_hdrlen(p, addr_len); 251 TCHECK2(*p,hdr_len); 252 253 if (p[addr_len] != 0x03 && dlci != 0) { 254 255 /* lets figure out if we have cisco style encapsulation: */ 256 extracted_ethertype = EXTRACT_16BITS(p+addr_len); 257 258 if (eflag) 259 fr_hdr_print(length, addr_len, dlci, flags, extracted_ethertype); 260 261 if (ethertype_print(gndo, extracted_ethertype, 262 p+addr_len+ETHERTYPE_LEN, 263 length-addr_len-ETHERTYPE_LEN, 264 length-addr_len-ETHERTYPE_LEN) == 0) 265 /* ether_type not known, probably it wasn't one */ 266 printf("UI %02x! ", p[addr_len]); 267 else 268 return hdr_len; 269 } 270 271 if (!p[addr_len + 1]) { /* pad byte should be used with 3-byte Q.922 */ 272 if (addr_len != 3) 273 printf("Pad! "); 274 } else if (addr_len == 3) 275 printf("No pad! "); 276 277 nlpid = p[hdr_len - 1]; 278 279 if (eflag) 280 fr_hdr_print(length, addr_len, dlci, flags, nlpid); 281 p += hdr_len; 282 length -= hdr_len; 283 284 switch (nlpid) { 285 case NLPID_IP: 286 ip_print(gndo, p, length); 287 break; 288 289 #ifdef INET6 290 case NLPID_IP6: 291 ip6_print(gndo, p, length); 292 break; 293 #endif 294 case NLPID_CLNP: 295 case NLPID_ESIS: 296 case NLPID_ISIS: 297 isoclns_print(p-1, length+1, length+1); /* OSI printers need the NLPID field */ 298 break; 299 300 case NLPID_SNAP: 301 if (snap_print(p, length, length, 0) == 0) { 302 /* ether_type not known, print raw packet */ 303 if (!eflag) 304 fr_hdr_print(length + hdr_len, hdr_len, 305 dlci, flags, nlpid); 306 if (!suppress_default_print) 307 default_print(p - hdr_len, length + hdr_len); 308 } 309 break; 310 311 case NLPID_Q933: 312 q933_print(p, length); 313 break; 314 315 case NLPID_MFR: 316 frf15_print(p, length); 317 break; 318 319 case NLPID_PPP: 320 ppp_print(p, length); 321 break; 322 323 default: 324 if (!eflag) 325 fr_hdr_print(length + hdr_len, addr_len, 326 dlci, flags, nlpid); 327 if (!xflag) 328 default_print(p, length); 329 } 330 331 return hdr_len; 332 333 trunc: 334 printf("[|fr]"); 335 return 0; 336 337 } 338 339 u_int 340 mfr_if_print(const struct pcap_pkthdr *h, register const u_char *p) 341 { 342 register u_int length = h->len; 343 register u_int caplen = h->caplen; 344 345 TCHECK2(*p, 2); /* minimum frame header length */ 346 347 if ((length = mfr_print(p, length)) == 0) 348 return (0); 349 else 350 return length; 351 trunc: 352 printf("[|mfr]"); 353 return caplen; 354 } 355 356 357 #define MFR_CTRL_MSG_ADD_LINK 1 358 #define MFR_CTRL_MSG_ADD_LINK_ACK 2 359 #define MFR_CTRL_MSG_ADD_LINK_REJ 3 360 #define MFR_CTRL_MSG_HELLO 4 361 #define MFR_CTRL_MSG_HELLO_ACK 5 362 #define MFR_CTRL_MSG_REMOVE_LINK 6 363 #define MFR_CTRL_MSG_REMOVE_LINK_ACK 7 364 365 struct tok mfr_ctrl_msg_values[] = { 366 { MFR_CTRL_MSG_ADD_LINK, "Add Link" }, 367 { MFR_CTRL_MSG_ADD_LINK_ACK, "Add Link ACK" }, 368 { MFR_CTRL_MSG_ADD_LINK_REJ, "Add Link Reject" }, 369 { MFR_CTRL_MSG_HELLO, "Hello" }, 370 { MFR_CTRL_MSG_HELLO_ACK, "Hello ACK" }, 371 { MFR_CTRL_MSG_REMOVE_LINK, "Remove Link" }, 372 { MFR_CTRL_MSG_REMOVE_LINK_ACK, "Remove Link ACK" }, 373 { 0, NULL } 374 }; 375 376 #define MFR_CTRL_IE_BUNDLE_ID 1 377 #define MFR_CTRL_IE_LINK_ID 2 378 #define MFR_CTRL_IE_MAGIC_NUM 3 379 #define MFR_CTRL_IE_TIMESTAMP 5 380 #define MFR_CTRL_IE_VENDOR_EXT 6 381 #define MFR_CTRL_IE_CAUSE 7 382 383 struct tok mfr_ctrl_ie_values[] = { 384 { MFR_CTRL_IE_BUNDLE_ID, "Bundle ID"}, 385 { MFR_CTRL_IE_LINK_ID, "Link ID"}, 386 { MFR_CTRL_IE_MAGIC_NUM, "Magic Number"}, 387 { MFR_CTRL_IE_TIMESTAMP, "Timestamp"}, 388 { MFR_CTRL_IE_VENDOR_EXT, "Vendor Extension"}, 389 { MFR_CTRL_IE_CAUSE, "Cause"}, 390 { 0, NULL } 391 }; 392 393 #define MFR_ID_STRING_MAXLEN 50 394 395 struct ie_tlv_header_t { 396 u_int8_t ie_type; 397 u_int8_t ie_len; 398 }; 399 400 u_int 401 mfr_print(register const u_char *p, u_int length) 402 { 403 u_int tlen,idx,hdr_len = 0; 404 u_int16_t sequence_num; 405 u_int8_t ie_type,ie_len; 406 const u_int8_t *tptr; 407 408 409 /* 410 * FRF.16 Link Integrity Control Frame 411 * 412 * 7 6 5 4 3 2 1 0 413 * +----+----+----+----+----+----+----+----+ 414 * | B | E | C=1| 0 0 0 0 | EA | 415 * +----+----+----+----+----+----+----+----+ 416 * | 0 0 0 0 0 0 0 0 | 417 * +----+----+----+----+----+----+----+----+ 418 * | message type | 419 * +----+----+----+----+----+----+----+----+ 420 */ 421 422 TCHECK2(*p, 4); /* minimum frame header length */ 423 424 if ((p[0] & MFR_BEC_MASK) == MFR_CTRL_FRAME && p[1] == 0) { 425 printf("FRF.16 Control, Flags [%s], %s, length %u", 426 bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK)), 427 tok2str(mfr_ctrl_msg_values,"Unknown Message (0x%02x)",p[2]), 428 length); 429 tptr = p + 3; 430 tlen = length -3; 431 hdr_len = 3; 432 433 if (!vflag) 434 return hdr_len; 435 436 while (tlen>sizeof(struct ie_tlv_header_t)) { 437 TCHECK2(*tptr, sizeof(struct ie_tlv_header_t)); 438 ie_type=tptr[0]; 439 ie_len=tptr[1]; 440 441 printf("\n\tIE %s (%u), length %u: ", 442 tok2str(mfr_ctrl_ie_values,"Unknown",ie_type), 443 ie_type, 444 ie_len); 445 446 /* infinite loop check */ 447 if (ie_type == 0 || ie_len <= sizeof(struct ie_tlv_header_t)) 448 return hdr_len; 449 450 TCHECK2(*tptr,ie_len); 451 tptr+=sizeof(struct ie_tlv_header_t); 452 /* tlv len includes header */ 453 ie_len-=sizeof(struct ie_tlv_header_t); 454 tlen-=sizeof(struct ie_tlv_header_t); 455 456 switch (ie_type) { 457 458 case MFR_CTRL_IE_MAGIC_NUM: 459 printf("0x%08x",EXTRACT_32BITS(tptr)); 460 break; 461 462 case MFR_CTRL_IE_BUNDLE_ID: /* same message format */ 463 case MFR_CTRL_IE_LINK_ID: 464 for (idx = 0; idx < ie_len && idx < MFR_ID_STRING_MAXLEN; idx++) { 465 if (*(tptr+idx) != 0) /* don't print null termination */ 466 safeputchar(*(tptr+idx)); 467 else 468 break; 469 } 470 break; 471 472 case MFR_CTRL_IE_TIMESTAMP: 473 if (ie_len == sizeof(struct timeval)) { 474 ts_print((const struct timeval *)tptr); 475 break; 476 } 477 /* fall through and hexdump if no unix timestamp */ 478 479 /* 480 * FIXME those are the defined IEs that lack a decoder 481 * you are welcome to contribute code ;-) 482 */ 483 484 case MFR_CTRL_IE_VENDOR_EXT: 485 case MFR_CTRL_IE_CAUSE: 486 487 default: 488 if (vflag <= 1) 489 print_unknown_data(tptr,"\n\t ",ie_len); 490 break; 491 } 492 493 /* do we want to see a hexdump of the IE ? */ 494 if (vflag > 1 ) 495 print_unknown_data(tptr,"\n\t ",ie_len); 496 497 tlen-=ie_len; 498 tptr+=ie_len; 499 } 500 return hdr_len; 501 } 502 /* 503 * FRF.16 Fragmentation Frame 504 * 505 * 7 6 5 4 3 2 1 0 506 * +----+----+----+----+----+----+----+----+ 507 * | B | E | C=0|seq. (high 4 bits) | EA | 508 * +----+----+----+----+----+----+----+----+ 509 * | sequence (low 8 bits) | 510 * +----+----+----+----+----+----+----+----+ 511 * | DLCI (6 bits) | CR | EA | 512 * +----+----+----+----+----+----+----+----+ 513 * | DLCI (4 bits) |FECN|BECN| DE | EA | 514 * +----+----+----+----+----+----+----+----+ 515 */ 516 517 sequence_num = (p[0]&0x1e)<<7 | p[1]; 518 /* whole packet or first fragment ? */ 519 if ((p[0] & MFR_BEC_MASK) == MFR_FRAG_FRAME || 520 (p[0] & MFR_BEC_MASK) == MFR_B_BIT) { 521 printf("FRF.16 Frag, seq %u, Flags [%s], ", 522 sequence_num, 523 bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK))); 524 hdr_len = 2; 525 fr_print(p+hdr_len,length-hdr_len); 526 return hdr_len; 527 } 528 529 /* must be a middle or the last fragment */ 530 printf("FRF.16 Frag, seq %u, Flags [%s]", 531 sequence_num, 532 bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK))); 533 print_unknown_data(p,"\n\t",length); 534 535 return hdr_len; 536 537 trunc: 538 printf("[|mfr]"); 539 return length; 540 } 541 542 /* an NLPID of 0xb1 indicates a 2-byte 543 * FRF.15 header 544 * 545 * 7 6 5 4 3 2 1 0 546 * +----+----+----+----+----+----+----+----+ 547 * ~ Q.922 header ~ 548 * +----+----+----+----+----+----+----+----+ 549 * | NLPID (8 bits) | NLPID=0xb1 550 * +----+----+----+----+----+----+----+----+ 551 * | B | E | C |seq. (high 4 bits) | R | 552 * +----+----+----+----+----+----+----+----+ 553 * | sequence (low 8 bits) | 554 * +----+----+----+----+----+----+----+----+ 555 */ 556 557 #define FR_FRF15_FRAGTYPE 0x01 558 559 static void 560 frf15_print (const u_char *p, u_int length) { 561 562 u_int16_t sequence_num, flags; 563 564 flags = p[0]&MFR_BEC_MASK; 565 sequence_num = (p[0]&0x1e)<<7 | p[1]; 566 567 printf("FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u", 568 sequence_num, 569 bittok2str(frf_flag_values,"none",flags), 570 p[0]&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End", 571 length); 572 573 /* TODO: 574 * depending on all permutations of the B, E and C bit 575 * dig as deep as we can - e.g. on the first (B) fragment 576 * there is enough payload to print the IP header 577 * on non (B) fragments it depends if the fragmentation 578 * model is end-to-end or interface based wether we want to print 579 * another Q.922 header 580 */ 581 582 } 583 584 /* 585 * Q.933 decoding portion for framerelay specific. 586 */ 587 588 /* Q.933 packet format 589 Format of Other Protocols 590 using Q.933 NLPID 591 +-------------------------------+ 592 | Q.922 Address | 593 +---------------+---------------+ 594 |Control 0x03 | NLPID 0x08 | 595 +---------------+---------------+ 596 | L2 Protocol ID | 597 | octet 1 | octet 2 | 598 +-------------------------------+ 599 | L3 Protocol ID | 600 | octet 2 | octet 2 | 601 +-------------------------------+ 602 | Protocol Data | 603 +-------------------------------+ 604 | FCS | 605 +-------------------------------+ 606 */ 607 608 /* L2 (Octet 1)- Call Reference Usually is 0x0 */ 609 610 /* 611 * L2 (Octet 2)- Message Types definition 1 byte long. 612 */ 613 /* Call Establish */ 614 #define MSG_TYPE_ESC_TO_NATIONAL 0x00 615 #define MSG_TYPE_ALERT 0x01 616 #define MSG_TYPE_CALL_PROCEEDING 0x02 617 #define MSG_TYPE_CONNECT 0x07 618 #define MSG_TYPE_CONNECT_ACK 0x0F 619 #define MSG_TYPE_PROGRESS 0x03 620 #define MSG_TYPE_SETUP 0x05 621 /* Call Clear */ 622 #define MSG_TYPE_DISCONNECT 0x45 623 #define MSG_TYPE_RELEASE 0x4D 624 #define MSG_TYPE_RELEASE_COMPLETE 0x5A 625 #define MSG_TYPE_RESTART 0x46 626 #define MSG_TYPE_RESTART_ACK 0x4E 627 /* Status */ 628 #define MSG_TYPE_STATUS 0x7D 629 #define MSG_TYPE_STATUS_ENQ 0x75 630 631 struct tok fr_q933_msg_values[] = { 632 { MSG_TYPE_ESC_TO_NATIONAL, "ESC to National" }, 633 { MSG_TYPE_ALERT, "Alert" }, 634 { MSG_TYPE_CALL_PROCEEDING, "Call proceeding" }, 635 { MSG_TYPE_CONNECT, "Connect" }, 636 { MSG_TYPE_CONNECT_ACK, "Connect ACK" }, 637 { MSG_TYPE_PROGRESS, "Progress" }, 638 { MSG_TYPE_SETUP, "Setup" }, 639 { MSG_TYPE_DISCONNECT, "Disconnect" }, 640 { MSG_TYPE_RELEASE, "Release" }, 641 { MSG_TYPE_RELEASE_COMPLETE, "Release Complete" }, 642 { MSG_TYPE_RESTART, "Restart" }, 643 { MSG_TYPE_RESTART_ACK, "Restart ACK" }, 644 { MSG_TYPE_STATUS, "Status Reply" }, 645 { MSG_TYPE_STATUS_ENQ, "Status Enquiry" }, 646 { 0, NULL } 647 }; 648 649 #define MSG_ANSI_LOCKING_SHIFT 0x95 650 651 #define FR_LMI_ANSI_REPORT_TYPE_IE 0x01 652 #define FR_LMI_ANSI_LINK_VERIFY_IE_91 0x19 /* details? */ 653 #define FR_LMI_ANSI_LINK_VERIFY_IE 0x03 654 #define FR_LMI_ANSI_PVC_STATUS_IE 0x07 655 656 #define FR_LMI_CCITT_REPORT_TYPE_IE 0x51 657 #define FR_LMI_CCITT_LINK_VERIFY_IE 0x53 658 #define FR_LMI_CCITT_PVC_STATUS_IE 0x57 659 660 struct tok fr_q933_ie_values_codeset5[] = { 661 { FR_LMI_ANSI_REPORT_TYPE_IE, "ANSI Report Type" }, 662 { FR_LMI_ANSI_LINK_VERIFY_IE_91, "ANSI Link Verify" }, 663 { FR_LMI_ANSI_LINK_VERIFY_IE, "ANSI Link Verify" }, 664 { FR_LMI_ANSI_PVC_STATUS_IE, "ANSI PVC Status" }, 665 { FR_LMI_CCITT_REPORT_TYPE_IE, "CCITT Report Type" }, 666 { FR_LMI_CCITT_LINK_VERIFY_IE, "CCITT Link Verify" }, 667 { FR_LMI_CCITT_PVC_STATUS_IE, "CCITT PVC Status" }, 668 { 0, NULL } 669 }; 670 671 #define FR_LMI_REPORT_TYPE_IE_FULL_STATUS 0 672 #define FR_LMI_REPORT_TYPE_IE_LINK_VERIFY 1 673 #define FR_LMI_REPORT_TYPE_IE_ASYNC_PVC 2 674 675 struct tok fr_lmi_report_type_ie_values[] = { 676 { FR_LMI_REPORT_TYPE_IE_FULL_STATUS, "Full Status" }, 677 { FR_LMI_REPORT_TYPE_IE_LINK_VERIFY, "Link verify" }, 678 { FR_LMI_REPORT_TYPE_IE_ASYNC_PVC, "Async PVC Status" }, 679 { 0, NULL } 680 }; 681 682 /* array of 16 codepages - currently we only support codepage 1,5 */ 683 static struct tok *fr_q933_ie_codesets[] = { 684 NULL, 685 fr_q933_ie_values_codeset5, 686 NULL, 687 NULL, 688 NULL, 689 fr_q933_ie_values_codeset5, 690 NULL, 691 NULL, 692 NULL, 693 NULL, 694 NULL, 695 NULL, 696 NULL, 697 NULL, 698 NULL, 699 NULL 700 }; 701 702 static int fr_q933_print_ie_codeset5(const struct ie_tlv_header_t *ie_p, 703 const u_char *p); 704 705 typedef int (*codeset_pr_func_t)(const struct ie_tlv_header_t *ie_p, 706 const u_char *p); 707 708 /* array of 16 codepages - currently we only support codepage 1,5 */ 709 static codeset_pr_func_t fr_q933_print_ie_codeset[] = { 710 NULL, 711 fr_q933_print_ie_codeset5, 712 NULL, 713 NULL, 714 NULL, 715 fr_q933_print_ie_codeset5, 716 NULL, 717 NULL, 718 NULL, 719 NULL, 720 NULL, 721 NULL, 722 NULL, 723 NULL, 724 NULL, 725 NULL 726 }; 727 728 void 729 q933_print(const u_char *p, u_int length) 730 { 731 const u_char *ptemp = p; 732 struct ie_tlv_header_t *ie_p; 733 int olen; 734 int is_ansi = 0; 735 u_int codeset; 736 u_int ie_is_known = 0; 737 738 if (length < 9) { /* shortest: Q.933a LINK VERIFY */ 739 printf("[|q.933]"); 740 return; 741 } 742 743 codeset = p[2]&0x0f; /* extract the codeset */ 744 745 if (p[2] == MSG_ANSI_LOCKING_SHIFT) { 746 is_ansi = 1; 747 } 748 749 printf("%s", eflag ? "" : "Q.933, "); 750 751 /* printing out header part */ 752 printf("%s, codeset %u", is_ansi ? "ANSI" : "CCITT", codeset); 753 754 if (p[0]) { 755 printf(", Call Ref: 0x%02x", p[0]); 756 } 757 if (vflag) { 758 printf(", %s (0x%02x), length %u", 759 tok2str(fr_q933_msg_values, 760 "unknown message", p[1]), 761 p[1], 762 length); 763 } else { 764 printf(", %s", 765 tok2str(fr_q933_msg_values, 766 "unknown message 0x%02x", p[1])); 767 } 768 769 olen = length; /* preserve the original length for non verbose mode */ 770 771 if (length < (u_int)(2 - is_ansi)) { 772 printf("[|q.933]"); 773 return; 774 } 775 length -= 2 + is_ansi; 776 ptemp += 2 + is_ansi; 777 778 /* Loop through the rest of IE */ 779 while (length > sizeof(struct ie_tlv_header_t)) { 780 ie_p = (struct ie_tlv_header_t *)ptemp; 781 if (length < sizeof(struct ie_tlv_header_t) || 782 length < sizeof(struct ie_tlv_header_t) + ie_p->ie_len) { 783 if (vflag) { /* not bark if there is just a trailer */ 784 printf("\n[|q.933]"); 785 } else { 786 printf(", length %u",olen); 787 } 788 return; 789 } 790 791 /* lets do the full IE parsing only in verbose mode 792 * however some IEs (DLCI Status, Link Verify) 793 * are also interestting in non-verbose mode */ 794 if (vflag) { 795 printf("\n\t%s IE (0x%02x), length %u: ", 796 tok2str(fr_q933_ie_codesets[codeset], 797 "unknown", ie_p->ie_type), 798 ie_p->ie_type, 799 ie_p->ie_len); 800 } 801 802 /* sanity check */ 803 if (ie_p->ie_type == 0 || ie_p->ie_len == 0) { 804 return; 805 } 806 807 if (fr_q933_print_ie_codeset[codeset] != NULL) { 808 ie_is_known = fr_q933_print_ie_codeset[codeset](ie_p, ptemp); 809 } 810 811 if (vflag >= 1 && !ie_is_known) { 812 print_unknown_data(ptemp+2,"\n\t",ie_p->ie_len); 813 } 814 815 /* do we want to see a hexdump of the IE ? */ 816 if (vflag> 1 && ie_is_known) { 817 print_unknown_data(ptemp+2,"\n\t ",ie_p->ie_len); 818 } 819 820 length = length - ie_p->ie_len - 2; 821 ptemp = ptemp + ie_p->ie_len + 2; 822 } 823 if (!vflag) { 824 printf(", length %u",olen); 825 } 826 } 827 828 static int 829 fr_q933_print_ie_codeset5(const struct ie_tlv_header_t *ie_p, const u_char *p) 830 { 831 u_int dlci; 832 833 switch (ie_p->ie_type) { 834 835 case FR_LMI_ANSI_REPORT_TYPE_IE: /* fall through */ 836 case FR_LMI_CCITT_REPORT_TYPE_IE: 837 if (vflag) { 838 printf("%s (%u)", 839 tok2str(fr_lmi_report_type_ie_values,"unknown",p[2]), 840 p[2]); 841 } 842 return 1; 843 844 case FR_LMI_ANSI_LINK_VERIFY_IE: /* fall through */ 845 case FR_LMI_CCITT_LINK_VERIFY_IE: 846 case FR_LMI_ANSI_LINK_VERIFY_IE_91: 847 if (!vflag) { 848 printf(", "); 849 } 850 printf("TX Seq: %3d, RX Seq: %3d", p[2], p[3]); 851 return 1; 852 853 case FR_LMI_ANSI_PVC_STATUS_IE: /* fall through */ 854 case FR_LMI_CCITT_PVC_STATUS_IE: 855 if (!vflag) { 856 printf(", "); 857 } 858 /* now parse the DLCI information element. */ 859 if ((ie_p->ie_len < 3) || 860 (p[2] & 0x80) || 861 ((ie_p->ie_len == 3) && !(p[3] & 0x80)) || 862 ((ie_p->ie_len == 4) && ((p[3] & 0x80) || !(p[4] & 0x80))) || 863 ((ie_p->ie_len == 5) && ((p[3] & 0x80) || (p[4] & 0x80) || 864 !(p[5] & 0x80))) || 865 (ie_p->ie_len > 5) || 866 !(p[ie_p->ie_len + 1] & 0x80)) { 867 printf("Invalid DLCI IE"); 868 } 869 870 dlci = ((p[2] & 0x3F) << 4) | ((p[3] & 0x78) >> 3); 871 if (ie_p->ie_len == 4) { 872 dlci = (dlci << 6) | ((p[4] & 0x7E) >> 1); 873 } 874 else if (ie_p->ie_len == 5) { 875 dlci = (dlci << 13) | (p[4] & 0x7F) | ((p[5] & 0x7E) >> 1); 876 } 877 878 printf("DLCI %u: status %s%s", dlci, 879 p[ie_p->ie_len + 1] & 0x8 ? "New, " : "", 880 p[ie_p->ie_len + 1] & 0x2 ? "Active" : "Inactive"); 881 return 1; 882 } 883 884 return 0; 885 } 886