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

   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  * Original code by Hannes Gredler (hannes@gredler.at)
  16  */
  17
  18 /* \summary: IEEE 802.1ag Connectivity Fault Management (CFM) protocols printer */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include <netdissect-stdinc.h>
  25
  26 #include <stdio.h>
  27
  28 #include "netdissect.h"
  29 #include "extract.h"
  30 #include "addrtoname.h"
  31 #include "oui.h"
  32 #include "af.h"
  33
  34 struct cfm_common_header_t {
  35     uint8_t mdlevel_version;
  36     uint8_t opcode;
  37     uint8_t flags;
  38     uint8_t first_tlv_offset;
  39 };
  40
  41 #define CFM_VERSION 0
  42 #define CFM_EXTRACT_VERSION(x) (((x)&0x1f))
  43 #define CFM_EXTRACT_MD_LEVEL(x) (((x)&0xe0)>>5)
  44
  45 #define CFM_OPCODE_CCM 1
  46 #define CFM_OPCODE_LBR 2
  47 #define CFM_OPCODE_LBM 3
  48 #define CFM_OPCODE_LTR 4
  49 #define CFM_OPCODE_LTM 5
  50
  51 static const struct tok cfm_opcode_values[] = {
  52     { CFM_OPCODE_CCM, "Continuity Check Message"},
  53     { CFM_OPCODE_LBR, "Loopback Reply"},
  54     { CFM_OPCODE_LBM, "Loopback Message"},
  55     { CFM_OPCODE_LTR, "Linktrace Reply"},
  56     { CFM_OPCODE_LTM, "Linktrace Message"},
  57     { 0, NULL}
  58 };
  59
  60 /*
  61  * Message Formats.
  62  */
  63 struct cfm_ccm_t {
  64     uint8_t sequence[4];
  65     uint8_t ma_epi[2];
  66     uint8_t names[48];
  67     uint8_t itu_t_y_1731[16];
  68 };
  69
  70 /*
  71  * Timer Bases for the CCM Interval field.
  72  * Expressed in units of seconds.
  73  */
  74 static const float ccm_interval_base[8] = {0, 0.003333, 0.01, 0.1, 1, 10, 60, 600};
  75 #define CCM_INTERVAL_MIN_MULTIPLIER 3.25
  76 #define CCM_INTERVAL_MAX_MULTIPLIER 3.5
  77
  78 #define CFM_CCM_RDI_FLAG 0x80
  79 #define CFM_EXTRACT_CCM_INTERVAL(x) (((x)&0x07))
  80
  81 #define CFM_CCM_MD_FORMAT_8021 0
  82 #define CFM_CCM_MD_FORMAT_NONE 1
  83 #define CFM_CCM_MD_FORMAT_DNS  2
  84 #define CFM_CCM_MD_FORMAT_MAC  3
  85 #define CFM_CCM_MD_FORMAT_CHAR 4
  86
  87 static const struct tok cfm_md_nameformat_values[] = {
  88     { CFM_CCM_MD_FORMAT_8021, "IEEE 802.1"},
  89     { CFM_CCM_MD_FORMAT_NONE, "No MD Name present"},
  90     { CFM_CCM_MD_FORMAT_DNS, "DNS string"},
  91     { CFM_CCM_MD_FORMAT_MAC, "MAC + 16Bit Integer"},
  92     { CFM_CCM_MD_FORMAT_CHAR, "Character string"},
  93     { 0, NULL}
  94 };
  95
  96 #define CFM_CCM_MA_FORMAT_8021 0
  97 #define CFM_CCM_MA_FORMAT_VID  1
  98 #define CFM_CCM_MA_FORMAT_CHAR 2
  99 #define CFM_CCM_MA_FORMAT_INT  3
 100 #define CFM_CCM_MA_FORMAT_VPN  4
 101
 102 static const struct tok cfm_ma_nameformat_values[] = {
 103     { CFM_CCM_MA_FORMAT_8021, "IEEE 802.1"},
 104     { CFM_CCM_MA_FORMAT_VID, "Primary VID"},
 105     { CFM_CCM_MA_FORMAT_CHAR, "Character string"},
 106     { CFM_CCM_MA_FORMAT_INT, "16Bit Integer"},
 107     { CFM_CCM_MA_FORMAT_VPN, "RFC2685 VPN-ID"},
 108     { 0, NULL}
 109 };
 110
 111 struct cfm_lbm_t {
 112     uint8_t transaction_id[4];
 113 };
 114
 115 struct cfm_ltm_t {
 116     uint8_t transaction_id[4];
 117     uint8_t ttl;
 118     nd_mac_addr original_mac;
 119     nd_mac_addr target_mac;
 120 };
 121
 122 static const struct tok cfm_ltm_flag_values[] = {
 123     { 0x80, "Use Forwarding-DB only"},
 124     { 0, NULL}
 125 };
 126
 127 struct cfm_ltr_t {
 128     uint8_t transaction_id[4];
 129     uint8_t ttl;
 130     uint8_t replay_action;
 131 };
 132
 133 static const struct tok cfm_ltr_flag_values[] = {
 134     { 0x80, "UseFDB Only"},
 135     { 0x40, "FwdYes"},
 136     { 0x20, "Terminal MEP"},
 137     { 0, NULL}
 138 };
 139
 140 static const struct tok cfm_ltr_replay_action_values[] = {
 141     { 1, "Exact Match"},
 142     { 2, "Filtering DB"},
 143     { 3, "MIP CCM DB"},
 144     { 0, NULL}
 145 };
 146
 147
 148 #define CFM_TLV_END 0
 149 #define CFM_TLV_SENDER_ID 1
 150 #define CFM_TLV_PORT_STATUS 2
 151 #define CFM_TLV_INTERFACE_STATUS 3
 152 #define CFM_TLV_DATA 4
 153 #define CFM_TLV_REPLY_INGRESS 5
 154 #define CFM_TLV_REPLY_EGRESS 6
 155 #define CFM_TLV_PRIVATE 31
 156
 157 static const struct tok cfm_tlv_values[] = {
 158     { CFM_TLV_END, "End"},
 159     { CFM_TLV_SENDER_ID, "Sender ID"},
 160     { CFM_TLV_PORT_STATUS, "Port status"},
 161     { CFM_TLV_INTERFACE_STATUS, "Interface status"},
 162     { CFM_TLV_DATA, "Data"},
 163     { CFM_TLV_REPLY_INGRESS, "Reply Ingress"},
 164     { CFM_TLV_REPLY_EGRESS, "Reply Egress"},
 165     { CFM_TLV_PRIVATE, "Organization Specific"},
 166     { 0, NULL}
 167 };
 168
 169 /*
 170  * TLVs
 171  */
 172
 173 struct cfm_tlv_header_t {
 174     uint8_t type;
 175     uint8_t length[2];
 176 };
 177
 178 /* FIXME define TLV formats */
 179
 180 static const struct tok cfm_tlv_port_status_values[] = {
 181     { 1, "Blocked"},
 182     { 2, "Up"},
 183     { 0, NULL}
 184 };
 185
 186 static const struct tok cfm_tlv_interface_status_values[] = {
 187     { 1, "Up"},
 188     { 2, "Down"},
 189     { 3, "Testing"},
 190     { 5, "Dormant"},
 191     { 6, "not present"},
 192     { 7, "lower Layer down"},
 193     { 0, NULL}
 194 };
 195
 196 #define CFM_CHASSIS_ID_CHASSIS_COMPONENT 1
 197 #define CFM_CHASSIS_ID_INTERFACE_ALIAS 2
 198 #define CFM_CHASSIS_ID_PORT_COMPONENT 3
 199 #define CFM_CHASSIS_ID_MAC_ADDRESS 4
 200 #define CFM_CHASSIS_ID_NETWORK_ADDRESS 5
 201 #define CFM_CHASSIS_ID_INTERFACE_NAME 6
 202 #define CFM_CHASSIS_ID_LOCAL 7
 203
 204 static const struct tok cfm_tlv_senderid_chassisid_values[] = {
 205     { 0, "Reserved"},
 206     { CFM_CHASSIS_ID_CHASSIS_COMPONENT, "Chassis component"},
 207     { CFM_CHASSIS_ID_INTERFACE_ALIAS, "Interface alias"},
 208     { CFM_CHASSIS_ID_PORT_COMPONENT, "Port component"},
 209     { CFM_CHASSIS_ID_MAC_ADDRESS, "MAC address"},
 210     { CFM_CHASSIS_ID_NETWORK_ADDRESS, "Network address"},
 211     { CFM_CHASSIS_ID_INTERFACE_NAME, "Interface name"},
 212     { CFM_CHASSIS_ID_LOCAL, "Locally assigned"},
 213     { 0, NULL}
 214 };
 215
 216
 217 static int
 218 cfm_network_addr_print(netdissect_options *ndo,
 219                        register const u_char *tptr, const u_int length)
 220 {
 221     u_int network_addr_type;
 222     u_int hexdump =  FALSE;
 223
 224     /*
 225      * Although AFIs are typically 2 octects wide,
 226      * 802.1ab specifies that this field width
 227      * is only one octet.
 228      */
 229     if (length < 1) {
 230         ND_PRINT((ndo, "\n\t  Network Address Type (invalid, no data"));
 231         return hexdump;
 232     }
 233     /* The calling function must make any due ND_TCHECK calls. */
 234     network_addr_type = EXTRACT_U_1(tptr);
 235     ND_PRINT((ndo, "\n\t  Network Address Type %s (%u)",
 236            tok2str(af_values, "Unknown", network_addr_type),
 237            network_addr_type));
 238
 239     /*
 240      * Resolve the passed in Address.
 241      */
 242     switch(network_addr_type) {
 243     case AFNUM_INET:
 244         if (length != 1 + 4) {
 245             ND_PRINT((ndo, "(invalid IPv4 address length %u)", length - 1));
 246             hexdump = TRUE;
 247             break;
 248         }
 249         ND_PRINT((ndo, ", %s", ipaddr_string(ndo, tptr + 1)));
 250         break;
 251
 252     case AFNUM_INET6:
 253         if (length != 1 + 16) {
 254             ND_PRINT((ndo, "(invalid IPv6 address length %u)", length - 1));
 255             hexdump = TRUE;
 256             break;
 257         }
 258         ND_PRINT((ndo, ", %s", ip6addr_string(ndo, tptr + 1)));
 259         break;
 260
 261     default:
 262         hexdump = TRUE;
 263         break;
 264     }
 265
 266     return hexdump;
 267 }
 268
 269 void
 270 cfm_print(netdissect_options *ndo,
 271           register const u_char *pptr, register u_int length)
 272 {
 273     const struct cfm_common_header_t *cfm_common_header;
 274     const struct cfm_tlv_header_t *cfm_tlv_header;
 275     const uint8_t *tptr, *tlv_ptr;
 276     const uint8_t *namesp;
 277     u_int names_data_remaining;
 278     uint8_t md_nameformat, md_namelength;
 279     const uint8_t *md_name;
 280     uint8_t ma_nameformat, ma_namelength;
 281     const uint8_t *ma_name;
 282     u_int hexdump, tlen, cfm_tlv_len, cfm_tlv_type, ccm_interval;
 283
 284
 285     union {
 286         const struct cfm_ccm_t *cfm_ccm;
 287         const struct cfm_lbm_t *cfm_lbm;
 288         const struct cfm_ltm_t *cfm_ltm;
 289         const struct cfm_ltr_t *cfm_ltr;
 290     } msg_ptr;
 291
 292     tptr=pptr;
 293     cfm_common_header = (const struct cfm_common_header_t *)pptr;
 294     if (length < sizeof(*cfm_common_header))
 295         goto tooshort;
 296     ND_TCHECK(*cfm_common_header);
 297
 298     /*
 299      * Sanity checking of the header.
 300      */
 301     if (CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version) != CFM_VERSION) {
 302         ND_PRINT((ndo, "CFMv%u not supported, length %u",
 303                CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version), length));
 304         return;
 305     }
 306
 307     ND_PRINT((ndo, "CFMv%u %s, MD Level %u, length %u",
 308            CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version),
 309            tok2str(cfm_opcode_values, "unknown (%u)", cfm_common_header->opcode),
 310            CFM_EXTRACT_MD_LEVEL(cfm_common_header->mdlevel_version),
 311            length));
 312
 313     /*
 314      * In non-verbose mode just print the opcode and md-level.
 315      */
 316     if (ndo->ndo_vflag < 1) {
 317         return;
 318     }
 319
 320     ND_PRINT((ndo, "\n\tFirst TLV offset %u", cfm_common_header->first_tlv_offset));
 321
 322     tptr += sizeof(struct cfm_common_header_t);
 323     tlen = length - sizeof(struct cfm_common_header_t);
 324
 325     /*
 326      * Sanity check the first TLV offset.
 327      */
 328     if (cfm_common_header->first_tlv_offset > tlen) {
 329         ND_PRINT((ndo, " (too large, must be <= %u)", tlen));
 330         return;
 331     }
 332
 333     switch (cfm_common_header->opcode) {
 334     case CFM_OPCODE_CCM:
 335         msg_ptr.cfm_ccm = (const struct cfm_ccm_t *)tptr;
 336         if (cfm_common_header->first_tlv_offset < sizeof(*msg_ptr.cfm_ccm)) {
 337             ND_PRINT((ndo, " (too small 1, must be >= %lu)",
 338                      (unsigned long) sizeof(*msg_ptr.cfm_ccm)));
 339             return;
 340         }
 341         if (tlen < sizeof(*msg_ptr.cfm_ccm))
 342             goto tooshort;
 343         ND_TCHECK(*msg_ptr.cfm_ccm);
 344
 345         ccm_interval = CFM_EXTRACT_CCM_INTERVAL(cfm_common_header->flags);
 346         ND_PRINT((ndo, ", Flags [CCM Interval %u%s]",
 347                ccm_interval,
 348                cfm_common_header->flags & CFM_CCM_RDI_FLAG ?
 349                ", RDI" : ""));
 350
 351         /*
 352          * Resolve the CCM interval field.
 353          */
 354         if (ccm_interval) {
 355             ND_PRINT((ndo, "\n\t  CCM Interval %.3fs"
 356                    ", min CCM Lifetime %.3fs, max CCM Lifetime %.3fs",
 357                    ccm_interval_base[ccm_interval],
 358                    ccm_interval_base[ccm_interval] * CCM_INTERVAL_MIN_MULTIPLIER,
 359                    ccm_interval_base[ccm_interval] * CCM_INTERVAL_MAX_MULTIPLIER));
 360         }
 361
 362         ND_PRINT((ndo, "\n\t  Sequence Number 0x%08x, MA-End-Point-ID 0x%04x",
 363                EXTRACT_BE_U_4(msg_ptr.cfm_ccm->sequence),
 364                EXTRACT_BE_U_2(msg_ptr.cfm_ccm->ma_epi)));
 365
 366         namesp = msg_ptr.cfm_ccm->names;
 367         names_data_remaining = sizeof(msg_ptr.cfm_ccm->names);
 368
 369         /*
 370          * Resolve the MD fields.
 371          */
 372         md_nameformat = EXTRACT_U_1(namesp);
 373         namesp++;
 374         names_data_remaining--;  /* We know this is != 0 */
 375         if (md_nameformat != CFM_CCM_MD_FORMAT_NONE) {
 376             md_namelength = EXTRACT_U_1(namesp);
 377             namesp++;
 378             names_data_remaining--; /* We know this is !=0 */
 379             ND_PRINT((ndo, "\n\t  MD Name Format %s (%u), MD Name length %u",
 380                    tok2str(cfm_md_nameformat_values, "Unknown",
 381                            md_nameformat),
 382                    md_nameformat,
 383                    md_namelength));
 384
 385             /*
 386              * -3 for the MA short name format and length and one byte
 387              * of MA short name.
 388              */
 389             if (md_namelength > names_data_remaining - 3) {
 390                 ND_PRINT((ndo, " (too large, must be <= %u)", names_data_remaining - 2));
 391                 return;
 392             }
 393
 394             md_name = namesp;
 395             ND_PRINT((ndo, "\n\t  MD Name: "));
 396             switch (md_nameformat) {
 397             case CFM_CCM_MD_FORMAT_DNS:
 398             case CFM_CCM_MD_FORMAT_CHAR:
 399                 safeputs(ndo, md_name, md_namelength);
 400                 break;
 401
 402             case CFM_CCM_MD_FORMAT_MAC:
 403                 if (md_namelength == 6) {
 404                     ND_PRINT((ndo, "\n\t  MAC %s", etheraddr_string(ndo,
 405                                md_name)));
 406                 } else {
 407                     ND_PRINT((ndo, "\n\t  MAC (length invalid)"));
 408                 }
 409                 break;
 410
 411                 /* FIXME add printers for those MD formats - hexdump for now */
 412             case CFM_CCM_MA_FORMAT_8021:
 413             default:
 414                 print_unknown_data(ndo, md_name, "\n\t    ",
 415                                    md_namelength);
 416             }
 417             namesp += md_namelength;
 418             names_data_remaining -= md_namelength;
 419         } else {
 420             ND_PRINT((ndo, "\n\t  MD Name Format %s (%u)",
 421                    tok2str(cfm_md_nameformat_values, "Unknown",
 422                            md_nameformat),
 423                    md_nameformat));
 424         }
 425
 426
 427         /*
 428          * Resolve the MA fields.
 429          */
 430         ma_nameformat = EXTRACT_U_1(namesp);
 431         namesp++;
 432         names_data_remaining--; /* We know this is != 0 */
 433         ma_namelength = EXTRACT_U_1(namesp);
 434         namesp++;
 435         names_data_remaining--; /* We know this is != 0 */
 436         ND_PRINT((ndo, "\n\t  MA Name-Format %s (%u), MA name length %u",
 437                tok2str(cfm_ma_nameformat_values, "Unknown",
 438                        ma_nameformat),
 439                ma_nameformat,
 440                ma_namelength));
 441
 442         if (ma_namelength > names_data_remaining) {
 443             ND_PRINT((ndo, " (too large, must be <= %u)", names_data_remaining));
 444             return;
 445         }
 446
 447         ma_name = namesp;
 448         ND_PRINT((ndo, "\n\t  MA Name: "));
 449         switch (ma_nameformat) {
 450         case CFM_CCM_MA_FORMAT_CHAR:
 451             safeputs(ndo, ma_name, ma_namelength);
 452             break;
 453
 454             /* FIXME add printers for those MA formats - hexdump for now */
 455         case CFM_CCM_MA_FORMAT_8021:
 456         case CFM_CCM_MA_FORMAT_VID:
 457         case CFM_CCM_MA_FORMAT_INT:
 458         case CFM_CCM_MA_FORMAT_VPN:
 459         default:
 460             print_unknown_data(ndo, ma_name, "\n\t    ", ma_namelength);
 461         }
 462         break;
 463
 464     case CFM_OPCODE_LTM:
 465         msg_ptr.cfm_ltm = (const struct cfm_ltm_t *)tptr;
 466         if (cfm_common_header->first_tlv_offset < sizeof(*msg_ptr.cfm_ltm)) {
 467             ND_PRINT((ndo, " (too small 4, must be >= %lu)",
 468                      (unsigned long) sizeof(*msg_ptr.cfm_ltm)));
 469             return;
 470         }
 471         if (tlen < sizeof(*msg_ptr.cfm_ltm))
 472             goto tooshort;
 473         ND_TCHECK(*msg_ptr.cfm_ltm);
 474
 475         ND_PRINT((ndo, ", Flags [%s]",
 476                bittok2str(cfm_ltm_flag_values, "none", cfm_common_header->flags)));
 477
 478         ND_PRINT((ndo, "\n\t  Transaction-ID 0x%08x, ttl %u",
 479                EXTRACT_BE_U_4(msg_ptr.cfm_ltm->transaction_id),
 480                msg_ptr.cfm_ltm->ttl));
 481
 482         ND_PRINT((ndo, "\n\t  Original-MAC %s, Target-MAC %s",
 483                etheraddr_string(ndo, msg_ptr.cfm_ltm->original_mac),
 484                etheraddr_string(ndo, msg_ptr.cfm_ltm->target_mac)));
 485         break;
 486
 487     case CFM_OPCODE_LTR:
 488         msg_ptr.cfm_ltr = (const struct cfm_ltr_t *)tptr;
 489         if (cfm_common_header->first_tlv_offset < sizeof(*msg_ptr.cfm_ltr)) {
 490             ND_PRINT((ndo, " (too small 5, must be >= %lu)",
 491                      (unsigned long) sizeof(*msg_ptr.cfm_ltr)));
 492             return;
 493         }
 494         if (tlen < sizeof(*msg_ptr.cfm_ltr))
 495             goto tooshort;
 496         ND_TCHECK(*msg_ptr.cfm_ltr);
 497
 498         ND_PRINT((ndo, ", Flags [%s]",
 499                bittok2str(cfm_ltr_flag_values, "none", cfm_common_header->flags)));
 500
 501         ND_PRINT((ndo, "\n\t  Transaction-ID 0x%08x, ttl %u",
 502                EXTRACT_BE_U_4(msg_ptr.cfm_ltr->transaction_id),
 503                msg_ptr.cfm_ltr->ttl));
 504
 505         ND_PRINT((ndo, "\n\t  Replay-Action %s (%u)",
 506                tok2str(cfm_ltr_replay_action_values,
 507                        "Unknown",
 508                        msg_ptr.cfm_ltr->replay_action),
 509                msg_ptr.cfm_ltr->replay_action));
 510         break;
 511
 512         /*
 513          * No message decoder yet.
 514          * Hexdump everything up until the start of the TLVs
 515          */
 516     case CFM_OPCODE_LBR:
 517     case CFM_OPCODE_LBM:
 518     default:
 519         print_unknown_data(ndo, tptr, "\n\t  ",
 520                            tlen -  cfm_common_header->first_tlv_offset);
 521         break;
 522     }
 523
 524     tptr += cfm_common_header->first_tlv_offset;
 525     tlen -= cfm_common_header->first_tlv_offset;
 526
 527     while (tlen > 0) {
 528         cfm_tlv_header = (const struct cfm_tlv_header_t *)tptr;
 529
 530         /* Enough to read the tlv type ? */
 531         ND_TCHECK_1(tptr);
 532         cfm_tlv_type=cfm_tlv_header->type;
 533
 534         ND_PRINT((ndo, "\n\t%s TLV (0x%02x)",
 535                tok2str(cfm_tlv_values, "Unknown", cfm_tlv_type),
 536                cfm_tlv_type));
 537
 538         if (cfm_tlv_type == CFM_TLV_END) {
 539             /* Length is "Not present if the Type field is 0." */
 540             return;
 541         }
 542
 543         /* do we have the full tlv header ? */
 544         if (tlen < sizeof(struct cfm_tlv_header_t))
 545             goto tooshort;
 546         ND_TCHECK_LEN(tptr, sizeof(struct cfm_tlv_header_t));
 547         cfm_tlv_len=EXTRACT_BE_U_2(&cfm_tlv_header->length);
 548
 549         ND_PRINT((ndo, ", length %u", cfm_tlv_len));
 550
 551         tptr += sizeof(struct cfm_tlv_header_t);
 552         tlen -= sizeof(struct cfm_tlv_header_t);
 553         tlv_ptr = tptr;
 554
 555         /* do we have the full tlv ? */
 556         if (tlen < cfm_tlv_len)
 557             goto tooshort;
 558         ND_TCHECK_LEN(tptr, cfm_tlv_len);
 559         hexdump = FALSE;
 560
 561         switch(cfm_tlv_type) {
 562         case CFM_TLV_PORT_STATUS:
 563             if (cfm_tlv_len < 1) {
 564                 ND_PRINT((ndo, " (too short, must be >= 1)"));
 565                 return;
 566             }
 567             ND_PRINT((ndo, ", Status: %s (%u)",
 568                    tok2str(cfm_tlv_port_status_values, "Unknown", EXTRACT_U_1(tptr)),
 569                    EXTRACT_U_1(tptr)));
 570             break;
 571
 572         case CFM_TLV_INTERFACE_STATUS:
 573             if (cfm_tlv_len < 1) {
 574                 ND_PRINT((ndo, " (too short, must be >= 1)"));
 575                 return;
 576             }
 577             ND_PRINT((ndo, ", Status: %s (%u)",
 578                    tok2str(cfm_tlv_interface_status_values, "Unknown", EXTRACT_U_1(tptr)),
 579                    EXTRACT_U_1(tptr)));
 580             break;
 581
 582         case CFM_TLV_PRIVATE:
 583             if (cfm_tlv_len < 4) {
 584                 ND_PRINT((ndo, " (too short, must be >= 4)"));
 585                 return;
 586             }
 587             ND_PRINT((ndo, ", Vendor: %s (%u), Sub-Type %u",
 588                    tok2str(oui_values,"Unknown", EXTRACT_BE_U_3(tptr)),
 589                    EXTRACT_BE_U_3(tptr),
 590                    EXTRACT_U_1(tptr + 3)));
 591             hexdump = TRUE;
 592             break;
 593
 594         case CFM_TLV_SENDER_ID:
 595         {
 596             u_int chassis_id_type, chassis_id_length;
 597             u_int mgmt_addr_length;
 598
 599             if (cfm_tlv_len < 1) {
 600                 ND_PRINT((ndo, " (too short, must be >= 1)"));
 601                 goto next_tlv;
 602             }
 603
 604             /*
 605              * Get the Chassis ID length and check it.
 606              * IEEE 802.1Q-2014 Section 21.5.3.1
 607              */
 608             chassis_id_length = EXTRACT_U_1(tptr);
 609             tptr++;
 610             tlen--;
 611             cfm_tlv_len--;
 612
 613             if (chassis_id_length) {
 614                 /*
 615                  * IEEE 802.1Q-2014 Section 21.5.3.2: Chassis ID Subtype, references
 616                  * IEEE 802.1AB-2005 Section 9.5.2.2, subsequently
 617                  * IEEE 802.1AB-2016 Section 8.5.2.2: chassis ID subtype
 618                  */
 619                 if (cfm_tlv_len < 1) {
 620                     ND_PRINT((ndo, "\n\t  (TLV too short)"));
 621                     goto next_tlv;
 622                 }
 623                 chassis_id_type = EXTRACT_U_1(tptr);
 624                 cfm_tlv_len--;
 625                 ND_PRINT((ndo, "\n\t  Chassis-ID Type %s (%u), Chassis-ID length %u",
 626                        tok2str(cfm_tlv_senderid_chassisid_values,
 627                                "Unknown",
 628                                chassis_id_type),
 629                        chassis_id_type,
 630                        chassis_id_length));
 631
 632                 if (cfm_tlv_len < chassis_id_length) {
 633                     ND_PRINT((ndo, "\n\t  (TLV too short)"));
 634                     goto next_tlv;
 635                 }
 636
 637                 /* IEEE 802.1Q-2014 Section 21.5.3.3: Chassis ID */
 638                 switch (chassis_id_type) {
 639                 case CFM_CHASSIS_ID_MAC_ADDRESS:
 640                     if (chassis_id_length != MAC_ADDR_LEN) {
 641                         ND_PRINT((ndo, " (invalid MAC address length)"));
 642                         hexdump = TRUE;
 643                         break;
 644                     }
 645                     ND_PRINT((ndo, "\n\t  MAC %s", etheraddr_string(ndo, tptr + 1)));
 646                     break;
 647
 648                 case CFM_CHASSIS_ID_NETWORK_ADDRESS:
 649                     hexdump |= cfm_network_addr_print(ndo, tptr + 1, chassis_id_length);
 650                     break;
 651
 652                 case CFM_CHASSIS_ID_INTERFACE_NAME: /* fall through */
 653                 case CFM_CHASSIS_ID_INTERFACE_ALIAS:
 654                 case CFM_CHASSIS_ID_LOCAL:
 655                 case CFM_CHASSIS_ID_CHASSIS_COMPONENT:
 656                 case CFM_CHASSIS_ID_PORT_COMPONENT:
 657                     safeputs(ndo, tptr + 1, chassis_id_length);
 658                     break;
 659
 660                 default:
 661                     hexdump = TRUE;
 662                     break;
 663                 }
 664                 cfm_tlv_len -= chassis_id_length;
 665
 666                 tptr += 1 + chassis_id_length;
 667                 tlen -= 1 + chassis_id_length;
 668             }
 669
 670             /*
 671              * Check if there is a Management Address.
 672              * IEEE 802.1Q-2014 Section 21.5.3.4: Management Address Domain Length
 673              * This and all subsequent fields are not present if the TLV length
 674              * allows only the above fields.
 675              */
 676             if (cfm_tlv_len == 0) {
 677                 /* No, there isn't; we're done. */
 678                 break;
 679             }
 680
 681             /* Here mgmt_addr_length stands for the management domain length. */
 682             mgmt_addr_length = EXTRACT_U_1(tptr);
 683             tptr++;
 684             tlen--;
 685             cfm_tlv_len--;
 686             ND_PRINT((ndo, "\n\t  Management Address Domain Length %u", mgmt_addr_length));
 687             if (mgmt_addr_length) {
 688                 /* IEEE 802.1Q-2014 Section 21.5.3.5: Management Address Domain */
 689                 if (cfm_tlv_len < mgmt_addr_length) {
 690                     ND_PRINT((ndo, "\n\t  (TLV too short)"));
 691                     goto next_tlv;
 692                 }
 693                 cfm_tlv_len -= mgmt_addr_length;
 694                 /*
 695                  * XXX - this is an OID; print it as such.
 696                  */
 697                 hex_print(ndo, "\n\t  Management Address Domain: ", tptr, mgmt_addr_length);
 698                 tptr += mgmt_addr_length;
 699                 tlen -= mgmt_addr_length;
 700
 701                 /*
 702                  * IEEE 802.1Q-2014 Section 21.5.3.6: Management Address Length
 703                  * This field is present if Management Address Domain Length is not 0.
 704                  */
 705                 if (cfm_tlv_len < 1) {
 706                     ND_PRINT((ndo, " (Management Address Length is missing)"));
 707                     hexdump = TRUE;
 708                     break;
 709                 }
 710
 711                 /* Here mgmt_addr_length stands for the management address length. */
 712                 mgmt_addr_length = EXTRACT_U_1(tptr);
 713                 tptr++;
 714                 tlen--;
 715                 cfm_tlv_len--;
 716                 ND_PRINT((ndo, "\n\t  Management Address Length %u", mgmt_addr_length));
 717                 if (mgmt_addr_length) {
 718                     /* IEEE 802.1Q-2014 Section 21.5.3.7: Management Address */
 719                     if (cfm_tlv_len < mgmt_addr_length) {
 720                         ND_PRINT((ndo, "\n\t  (TLV too short)"));
 721                         return;
 722                     }
 723                     cfm_tlv_len -= mgmt_addr_length;
 724                     /*
 725                      * XXX - this is a TransportDomain; print it as such.
 726                      */
 727                     hex_print(ndo, "\n\t  Management Address: ", tptr, mgmt_addr_length);
 728                     tptr += mgmt_addr_length;
 729                     tlen -= mgmt_addr_length;
 730                 }
 731             }
 732             break;
 733         }
 734
 735             /*
 736              * FIXME those are the defined TLVs that lack a decoder
 737              * you are welcome to contribute code ;-)
 738              */
 739
 740         case CFM_TLV_DATA:
 741         case CFM_TLV_REPLY_INGRESS:
 742         case CFM_TLV_REPLY_EGRESS:
 743         default:
 744             hexdump = TRUE;
 745             break;
 746         }
 747         /* do we want to see an additional hexdump ? */
 748         if (hexdump || ndo->ndo_vflag > 1)
 749             print_unknown_data(ndo, tlv_ptr, "\n\t  ", cfm_tlv_len);
 750
 751 next_tlv:
 752         tptr+=cfm_tlv_len;
 753         tlen-=cfm_tlv_len;
 754     }
 755     return;
 756
 757 tooshort:
 758     ND_PRINT((ndo, "\n\t\t packet is too short"));
 759     return;
 760
 761 trunc:
 762     ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
 763 }