1 /* 2 * Copyright (c) 1998-2006 The TCPDUMP project 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that: (1) source code 6 * distributions retain the above copyright notice and this paragraph 7 * in its entirety, and (2) distributions including binary code include 8 * the above copyright notice and this paragraph in its entirety in 9 * the documentation or other materials provided with the distribution. 10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND 11 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT 12 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 13 * FOR A PARTICULAR PURPOSE. 14 * 15 * Support for the IEEE Connectivity Fault Management Protocols as per 802.1ag. 16 * 17 * Original code by Hannes Gredler (hannes@juniper.net) 18 */ 19 20 #ifndef lint 21 static const char rcsid[] _U_ = 22 "@(#) $Header: /tcpdump/master/tcpdump/print-cfm.c,v 1.5 2007-07-24 16:01:42 hannes Exp $"; 23 #endif 24 25 #ifdef HAVE_CONFIG_H 26 #include "config.h" 27 #endif 28 29 #include <tcpdump-stdinc.h> 30 31 #include <stdio.h> 32 #include <stdlib.h> 33 #include <string.h> 34 35 #include "interface.h" 36 #include "extract.h" 37 #include "ether.h" 38 #include "addrtoname.h" 39 #include "oui.h" 40 #include "af.h" 41 42 /* 43 * Prototypes 44 */ 45 const char * cfm_egress_id_string(register const u_char *); 46 int cfm_mgmt_addr_print(register const u_char *); 47 48 struct cfm_common_header_t { 49 u_int8_t mdlevel_version; 50 u_int8_t opcode; 51 u_int8_t flags; 52 u_int8_t first_tlv_offset; 53 }; 54 55 #define CFM_VERSION 0 56 #define CFM_EXTRACT_VERSION(x) (((x)&0x1f)) 57 #define CFM_EXTRACT_MD_LEVEL(x) (((x)&0xe0)>>5) 58 59 #define CFM_OPCODE_CCM 1 60 #define CFM_OPCODE_LBR 2 61 #define CFM_OPCODE_LBM 3 62 #define CFM_OPCODE_LTR 4 63 #define CFM_OPCODE_LTM 5 64 65 static const struct tok cfm_opcode_values[] = { 66 { CFM_OPCODE_CCM, "Continouity Check Message"}, 67 { CFM_OPCODE_LBR, "Loopback Reply"}, 68 { CFM_OPCODE_LBM, "Loopback Message"}, 69 { CFM_OPCODE_LTR, "Linktrace Reply"}, 70 { CFM_OPCODE_LTM, "Linktrace Message"}, 71 { 0, NULL} 72 }; 73 74 /* 75 * Message Formats. 76 */ 77 struct cfm_ccm_t { 78 u_int8_t sequence[4]; 79 u_int8_t ma_epi[2]; 80 u_int8_t md_nameformat; 81 u_int8_t md_namelength; 82 u_int8_t md_name[46]; /* md name and short ma name */ 83 u_int8_t reserved_itu[16]; 84 u_int8_t reserved[6]; 85 }; 86 87 /* 88 * Timer Bases for the CCM Interval field. 89 * Expressed in units of seconds. 90 */ 91 const float ccm_interval_base[8] = {0, 0.003333, 0.01, 0.1, 1, 10, 60, 600}; 92 #define CCM_INTERVAL_MIN_MULTIPLIER 3.25 93 #define CCM_INTERVAL_MAX_MULTIPLIER 3.5 94 95 #define CFM_CCM_RDI_FLAG 0x80 96 #define CFM_EXTRACT_CCM_INTERVAL(x) (((x)&0x07)) 97 98 #define CFM_CCM_MD_FORMAT_8021 0 99 #define CFM_CCM_MD_FORMAT_NONE 1 100 #define CFM_CCM_MD_FORMAT_DNS 2 101 #define CFM_CCM_MD_FORMAT_MAC 3 102 #define CFM_CCM_MD_FORMAT_CHAR 4 103 104 static const struct tok cfm_md_nameformat_values[] = { 105 { CFM_CCM_MD_FORMAT_8021, "IEEE 802.1"}, 106 { CFM_CCM_MD_FORMAT_NONE, "No MD Name present"}, 107 { CFM_CCM_MD_FORMAT_DNS, "DNS string"}, 108 { CFM_CCM_MD_FORMAT_MAC, "MAC + 16Bit Integer"}, 109 { CFM_CCM_MD_FORMAT_CHAR, "Character string"}, 110 { 0, NULL} 111 }; 112 113 #define CFM_CCM_MA_FORMAT_8021 0 114 #define CFM_CCM_MA_FORMAT_VID 1 115 #define CFM_CCM_MA_FORMAT_CHAR 2 116 #define CFM_CCM_MA_FORMAT_INT 3 117 #define CFM_CCM_MA_FORMAT_VPN 4 118 119 static const struct tok cfm_ma_nameformat_values[] = { 120 { CFM_CCM_MA_FORMAT_8021, "IEEE 802.1"}, 121 { CFM_CCM_MA_FORMAT_VID, "Primary VID"}, 122 { CFM_CCM_MA_FORMAT_CHAR, "Character string"}, 123 { CFM_CCM_MA_FORMAT_INT, "16Bit Integer"}, 124 { CFM_CCM_MA_FORMAT_VPN, "RFC2685 VPN-ID"}, 125 { 0, NULL} 126 }; 127 128 struct cfm_lbm_t { 129 u_int8_t transaction_id[4]; 130 u_int8_t reserved[4]; 131 }; 132 133 struct cfm_ltm_t { 134 u_int8_t transaction_id[4]; 135 u_int8_t egress_id[8]; 136 u_int8_t ttl; 137 u_int8_t original_mac[ETHER_ADDR_LEN]; 138 u_int8_t target_mac[ETHER_ADDR_LEN]; 139 u_int8_t reserved[3]; 140 }; 141 142 static const struct tok cfm_ltm_flag_values[] = { 143 { 0x80, "Use Forwarding-DB only"}, 144 { 0, NULL} 145 }; 146 147 struct cfm_ltr_t { 148 u_int8_t transaction_id[4]; 149 u_int8_t last_egress_id[8]; 150 u_int8_t next_egress_id[8]; 151 u_int8_t ttl; 152 u_int8_t replay_action; 153 u_int8_t reserved[6]; 154 }; 155 156 static const struct tok cfm_ltr_flag_values[] = { 157 { 0x80, "Forwarded"}, 158 { 0x40, "Terminal MEP"}, 159 { 0, NULL} 160 }; 161 162 static const struct tok cfm_ltr_replay_action_values[] = { 163 { 1, "Exact Match"}, 164 { 2, "Filtering DB"}, 165 { 3, "MIP CCM DB"}, 166 { 0, NULL} 167 }; 168 169 170 #define CFM_TLV_END 0 171 #define CFM_TLV_SENDER_ID 1 172 #define CFM_TLV_PORT_STATUS 2 173 #define CFM_TLV_INTERFACE_STATUS 3 174 #define CFM_TLV_DATA 4 175 #define CFM_TLV_REPLY_INGRESS 5 176 #define CFM_TLV_REPLY_EGRESS 6 177 #define CFM_TLV_PRIVATE 31 178 179 static const struct tok cfm_tlv_values[] = { 180 { CFM_TLV_END, "End"}, 181 { CFM_TLV_SENDER_ID, "Sender ID"}, 182 { CFM_TLV_PORT_STATUS, "Port status"}, 183 { CFM_TLV_INTERFACE_STATUS, "Interface status"}, 184 { CFM_TLV_DATA, "Data"}, 185 { CFM_TLV_REPLY_INGRESS, "Reply Ingress"}, 186 { CFM_TLV_REPLY_EGRESS, "Reply Egress"}, 187 { CFM_TLV_PRIVATE, "Organization Specific"}, 188 { 0, NULL} 189 }; 190 191 /* 192 * TLVs 193 */ 194 195 struct cfm_tlv_header_t { 196 u_int8_t type; 197 u_int8_t length[2]; 198 }; 199 200 /* FIXME define TLV formats */ 201 202 static const struct tok cfm_tlv_port_status_values[] = { 203 { 1, "Blocked"}, 204 { 2, "Up"}, 205 { 0, NULL} 206 }; 207 208 static const struct tok cfm_tlv_interface_status_values[] = { 209 { 1, "Up"}, 210 { 2, "Down"}, 211 { 3, "Testing"}, 212 { 5, "Dormant"}, 213 { 6, "not present"}, 214 { 7, "lower Layer down"}, 215 { 0, NULL} 216 }; 217 218 #define CFM_CHASSIS_ID_CHASSIS_COMPONENT 1 219 #define CFM_CHASSIS_ID_INTERFACE_ALIAS 2 220 #define CFM_CHASSIS_ID_PORT_COMPONENT 3 221 #define CFM_CHASSIS_ID_MAC_ADDRESS 4 222 #define CFM_CHASSIS_ID_NETWORK_ADDRESS 5 223 #define CFM_CHASSIS_ID_INTERFACE_NAME 6 224 #define CFM_CHASSIS_ID_LOCAL 7 225 226 static const struct tok cfm_tlv_senderid_chassisid_values[] = { 227 { 0, "Reserved"}, 228 { CFM_CHASSIS_ID_CHASSIS_COMPONENT, "Chassis component"}, 229 { CFM_CHASSIS_ID_INTERFACE_ALIAS, "Interface alias"}, 230 { CFM_CHASSIS_ID_PORT_COMPONENT, "Port component"}, 231 { CFM_CHASSIS_ID_MAC_ADDRESS, "MAC address"}, 232 { CFM_CHASSIS_ID_NETWORK_ADDRESS, "Network address"}, 233 { CFM_CHASSIS_ID_INTERFACE_NAME, "Interface name"}, 234 { CFM_CHASSIS_ID_LOCAL, "Locally assigned"}, 235 { 0, NULL} 236 }; 237 238 239 int 240 cfm_mgmt_addr_print(register const u_char *tptr) { 241 242 u_int mgmt_addr_type; 243 u_int hexdump = FALSE; 244 245 /* 246 * Altough AFIs are tpically 2 octects wide, 247 * 802.1ab specifies that this field width 248 * is only once octet 249 */ 250 mgmt_addr_type = *tptr; 251 printf("\n\t Management Address Type %s (%u)", 252 tok2str(af_values, "Unknown", mgmt_addr_type), 253 mgmt_addr_type); 254 255 /* 256 * Resolve the passed in Address. 257 */ 258 switch(mgmt_addr_type) { 259 case AFNUM_INET: 260 printf(", %s", ipaddr_string(tptr + 1)); 261 break; 262 263 #ifdef INET6 264 case AFNUM_INET6: 265 printf(", %s", ip6addr_string(tptr + 1)); 266 break; 267 #endif 268 269 default: 270 hexdump = TRUE; 271 break; 272 } 273 274 return hexdump; 275 } 276 277 /* 278 * The egress-ID string is a 16-Bit string plus a MAC address. 279 */ 280 const char * 281 cfm_egress_id_string(register const u_char *tptr) { 282 static char egress_id_buffer[80]; 283 284 snprintf(egress_id_buffer, sizeof(egress_id_buffer), 285 "MAC %0x4x-%s", 286 EXTRACT_16BITS(tptr), 287 etheraddr_string(tptr+2)); 288 289 return egress_id_buffer; 290 } 291 292 void 293 cfm_print(register const u_char *pptr, register u_int length) { 294 295 const struct cfm_common_header_t *cfm_common_header; 296 const struct cfm_tlv_header_t *cfm_tlv_header; 297 const u_int8_t *tptr, *tlv_ptr, *ma_name, *ma_nameformat, *ma_namelength; 298 u_int hexdump, tlen, cfm_tlv_len, cfm_tlv_type, ccm_interval; 299 300 301 union { 302 const struct cfm_ccm_t *cfm_ccm; 303 const struct cfm_lbm_t *cfm_lbm; 304 const struct cfm_ltm_t *cfm_ltm; 305 const struct cfm_ltr_t *cfm_ltr; 306 } msg_ptr; 307 308 tptr=pptr; 309 cfm_common_header = (const struct cfm_common_header_t *)pptr; 310 TCHECK(*cfm_common_header); 311 312 /* 313 * Sanity checking of the header. 314 */ 315 if (CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version) != CFM_VERSION) { 316 printf("CFMv%u not supported, length %u", 317 CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version), length); 318 return; 319 } 320 321 printf("CFMv%u %s, MD Level %u, length %u", 322 CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version), 323 tok2str(cfm_opcode_values, "unknown (%u)", cfm_common_header->opcode), 324 CFM_EXTRACT_MD_LEVEL(cfm_common_header->mdlevel_version), 325 length); 326 327 /* 328 * In non-verbose mode just print the opcode and md-level. 329 */ 330 if (vflag < 1) { 331 return; 332 } 333 334 printf("\n\tFirst TLV offset %u", cfm_common_header->first_tlv_offset); 335 336 tptr += sizeof(const struct cfm_common_header_t); 337 tlen = length - sizeof(struct cfm_common_header_t); 338 339 switch (cfm_common_header->opcode) { 340 case CFM_OPCODE_CCM: 341 msg_ptr.cfm_ccm = (const struct cfm_ccm_t *)tptr; 342 343 ccm_interval = CFM_EXTRACT_CCM_INTERVAL(cfm_common_header->flags); 344 printf(", Flags [CCM Interval %u%s]", 345 ccm_interval, 346 cfm_common_header->flags & CFM_CCM_RDI_FLAG ? 347 ", RDI" : ""); 348 349 /* 350 * Resolve the CCM interval field. 351 */ 352 if (ccm_interval) { 353 printf("\n\t CCM Interval %.3fs" 354 ", min CCM Lifetime %.3fs, max CCM Lifetime %.3fs", 355 ccm_interval_base[ccm_interval], 356 ccm_interval_base[ccm_interval] * CCM_INTERVAL_MIN_MULTIPLIER, 357 ccm_interval_base[ccm_interval] * CCM_INTERVAL_MAX_MULTIPLIER); 358 } 359 360 printf("\n\t Sequence Number 0x%08x, MA-End-Point-ID 0x%04x", 361 EXTRACT_32BITS(msg_ptr.cfm_ccm->sequence), 362 EXTRACT_16BITS(msg_ptr.cfm_ccm->ma_epi)); 363 364 365 /* 366 * Resolve the MD fields. 367 */ 368 printf("\n\t MD Name Format %s (%u), MD Name length %u", 369 tok2str(cfm_md_nameformat_values, "Unknown", 370 msg_ptr.cfm_ccm->md_nameformat), 371 msg_ptr.cfm_ccm->md_nameformat, 372 msg_ptr.cfm_ccm->md_namelength); 373 374 if (msg_ptr.cfm_ccm->md_nameformat != CFM_CCM_MD_FORMAT_NONE) { 375 printf("\n\t MD Name: "); 376 switch (msg_ptr.cfm_ccm->md_nameformat) { 377 case CFM_CCM_MD_FORMAT_DNS: 378 case CFM_CCM_MD_FORMAT_CHAR: 379 safeputs((const char *)msg_ptr.cfm_ccm->md_name, msg_ptr.cfm_ccm->md_namelength); 380 break; 381 382 case CFM_CCM_MD_FORMAT_MAC: 383 printf("\n\t MAC %s", etheraddr_string( 384 msg_ptr.cfm_ccm->md_name)); 385 break; 386 387 /* FIXME add printers for those MD formats - hexdump for now */ 388 case CFM_CCM_MA_FORMAT_8021: 389 default: 390 print_unknown_data(msg_ptr.cfm_ccm->md_name, "\n\t ", 391 msg_ptr.cfm_ccm->md_namelength); 392 } 393 } 394 395 396 /* 397 * Resolve the MA fields. 398 */ 399 ma_nameformat = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength; 400 ma_namelength = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength + 1; 401 ma_name = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength + 2; 402 403 printf("\n\t MA Name-Format %s (%u), MA name length %u", 404 tok2str(cfm_ma_nameformat_values, "Unknown", 405 *ma_nameformat), 406 *ma_nameformat, 407 *ma_namelength); 408 409 printf("\n\t MA Name: "); 410 switch (*ma_nameformat) { 411 case CFM_CCM_MA_FORMAT_CHAR: 412 safeputs((const char *)ma_name, *ma_namelength); 413 break; 414 415 /* FIXME add printers for those MA formats - hexdump for now */ 416 case CFM_CCM_MA_FORMAT_8021: 417 case CFM_CCM_MA_FORMAT_VID: 418 case CFM_CCM_MA_FORMAT_INT: 419 case CFM_CCM_MA_FORMAT_VPN: 420 default: 421 print_unknown_data(ma_name, "\n\t ", *ma_namelength); 422 } 423 break; 424 425 case CFM_OPCODE_LTM: 426 printf(", Flags [%s]", 427 bittok2str(cfm_ltm_flag_values, "none", cfm_common_header->flags)); 428 429 printf("\n\t Transaction-ID 0x%08x, Egress-ID %s, ttl %u", 430 EXTRACT_32BITS(msg_ptr.cfm_ltm->transaction_id), 431 cfm_egress_id_string(msg_ptr.cfm_ltm->egress_id), 432 msg_ptr.cfm_ltm->ttl); 433 434 printf("\n\t Original-MAC %s, Target-MAC %s", 435 etheraddr_string(msg_ptr.cfm_ltm->original_mac), 436 etheraddr_string(msg_ptr.cfm_ltm->target_mac)); 437 break; 438 439 case CFM_OPCODE_LTR: 440 printf(", Flags [%s]", 441 bittok2str(cfm_ltr_flag_values, "none", cfm_common_header->flags)); 442 443 printf("\n\t Transaction-ID 0x%08x, Last-Egress-ID %s", 444 EXTRACT_32BITS(msg_ptr.cfm_ltr->transaction_id), 445 cfm_egress_id_string(msg_ptr.cfm_ltr->last_egress_id)); 446 447 printf("\n\t Next-Egress-ID %s, ttl %u", 448 cfm_egress_id_string(msg_ptr.cfm_ltr->next_egress_id), 449 msg_ptr.cfm_ltr->ttl); 450 451 printf("\n\t Replay-Action %s (%u)", 452 tok2str(cfm_ltr_replay_action_values, 453 "Unknown", 454 msg_ptr.cfm_ltr->replay_action), 455 msg_ptr.cfm_ltr->replay_action); 456 break; 457 458 /* 459 * No message decoder yet. 460 * Hexdump everything up until the start of the TLVs 461 */ 462 case CFM_OPCODE_LBR: 463 case CFM_OPCODE_LBM: 464 default: 465 if (tlen > cfm_common_header->first_tlv_offset) { 466 print_unknown_data(tptr, "\n\t ", 467 tlen - cfm_common_header->first_tlv_offset); 468 } 469 break; 470 } 471 472 /* 473 * Sanity check for not walking off. 474 */ 475 if (tlen <= cfm_common_header->first_tlv_offset) { 476 return; 477 } 478 479 tptr += cfm_common_header->first_tlv_offset; 480 tlen -= cfm_common_header->first_tlv_offset; 481 482 while (tlen > 0) { 483 cfm_tlv_header = (const struct cfm_tlv_header_t *)tptr; 484 485 /* Enough to read the tlv type ? */ 486 TCHECK2(*tptr, 1); 487 cfm_tlv_type=cfm_tlv_header->type; 488 489 if (cfm_tlv_type != CFM_TLV_END) { 490 /* did we capture enough for fully decoding the object header ? */ 491 TCHECK2(*tptr, sizeof(struct cfm_tlv_header_t)); 492 cfm_tlv_len=EXTRACT_16BITS(&cfm_tlv_header->length); 493 } else { 494 cfm_tlv_len = 0; 495 } 496 497 printf("\n\t%s TLV (0x%02x), length %u", 498 tok2str(cfm_tlv_values, "Unknown", cfm_tlv_type), 499 cfm_tlv_type, 500 cfm_tlv_len); 501 502 /* sanity check for not walking off and infinite loop check. */ 503 if ((cfm_tlv_type != CFM_TLV_END) && 504 ((cfm_tlv_len + sizeof(struct cfm_tlv_header_t) > tlen) || 505 (!cfm_tlv_len))) { 506 print_unknown_data(tptr,"\n\t ",tlen); 507 return; 508 } 509 510 tptr += sizeof(struct cfm_tlv_header_t); 511 tlen -= sizeof(struct cfm_tlv_header_t); 512 tlv_ptr = tptr; 513 514 /* did we capture enough for fully decoding the object ? */ 515 if (cfm_tlv_type != CFM_TLV_END) { 516 TCHECK2(*tptr, cfm_tlv_len); 517 } 518 hexdump = FALSE; 519 520 switch(cfm_tlv_type) { 521 case CFM_TLV_END: 522 /* we are done - bail out */ 523 return; 524 525 case CFM_TLV_PORT_STATUS: 526 printf(", Status: %s (%u)", 527 tok2str(cfm_tlv_port_status_values, "Unknown", *tptr), 528 *tptr); 529 break; 530 531 case CFM_TLV_INTERFACE_STATUS: 532 printf(", Status: %s (%u)", 533 tok2str(cfm_tlv_interface_status_values, "Unknown", *tptr), 534 *tptr); 535 break; 536 537 case CFM_TLV_PRIVATE: 538 printf(", Vendor: %s (%u), Sub-Type %u", 539 tok2str(oui_values,"Unknown", EXTRACT_24BITS(tptr)), 540 EXTRACT_24BITS(tptr), 541 *(tptr+3)); 542 hexdump = TRUE; 543 break; 544 545 case CFM_TLV_SENDER_ID: 546 { 547 u_int chassis_id_type, chassis_id_length; 548 u_int mgmt_addr_length; 549 550 /* 551 * Check if there is a Chassis-ID. 552 */ 553 chassis_id_length = *tptr; 554 if (chassis_id_length > tlen) { 555 hexdump = TRUE; 556 break; 557 } 558 559 tptr++; 560 tlen--; 561 562 if (chassis_id_length) { 563 chassis_id_type = *tptr; 564 printf("\n\t Chassis-ID Type %s (%u), Chassis-ID length %u", 565 tok2str(cfm_tlv_senderid_chassisid_values, 566 "Unknown", 567 chassis_id_type), 568 chassis_id_type, 569 chassis_id_length); 570 571 switch (chassis_id_type) { 572 case CFM_CHASSIS_ID_MAC_ADDRESS: 573 printf("\n\t MAC %s", etheraddr_string(tptr+1)); 574 break; 575 576 case CFM_CHASSIS_ID_NETWORK_ADDRESS: 577 hexdump |= cfm_mgmt_addr_print(tptr); 578 break; 579 580 case CFM_CHASSIS_ID_INTERFACE_NAME: /* fall through */ 581 case CFM_CHASSIS_ID_INTERFACE_ALIAS: 582 case CFM_CHASSIS_ID_LOCAL: 583 case CFM_CHASSIS_ID_CHASSIS_COMPONENT: 584 case CFM_CHASSIS_ID_PORT_COMPONENT: 585 safeputs((const char *)tptr+1, chassis_id_length); 586 break; 587 588 default: 589 hexdump = TRUE; 590 break; 591 } 592 } 593 594 tptr += chassis_id_length; 595 tlen -= chassis_id_length; 596 597 /* 598 * Check if there is a Management Address. 599 */ 600 mgmt_addr_length = *tptr; 601 if (mgmt_addr_length > tlen) { 602 hexdump = TRUE; 603 break; 604 } 605 606 tptr++; 607 tlen--; 608 609 if (mgmt_addr_length) { 610 hexdump |= cfm_mgmt_addr_print(tptr); 611 } 612 613 tptr += mgmt_addr_length; 614 tlen -= mgmt_addr_length; 615 616 } 617 break; 618 619 /* 620 * FIXME those are the defined TLVs that lack a decoder 621 * you are welcome to contribute code ;-) 622 */ 623 624 case CFM_TLV_DATA: 625 case CFM_TLV_REPLY_INGRESS: 626 case CFM_TLV_REPLY_EGRESS: 627 default: 628 hexdump = TRUE; 629 break; 630 } 631 /* do we want to see an additional hexdump ? */ 632 if (hexdump || vflag > 1) 633 print_unknown_data(tlv_ptr, "\n\t ", cfm_tlv_len); 634 635 tptr+=cfm_tlv_len; 636 tlen-=cfm_tlv_len; 637 } 638 return; 639 trunc: 640 printf("\n\t\t packet exceeded snapshot"); 641 } 642