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   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
  35 struct cfm_common_header_t {
  36     nd_uint8_t mdlevel_version;
  37     nd_uint8_t opcode;
  38     nd_uint8_t flags;
  39     nd_uint8_t first_tlv_offset;
  40 };
  41
  42 #define CFM_VERSION 0
  43 #define CFM_EXTRACT_VERSION(x) ((x)&0x1f)
  44 #define CFM_EXTRACT_MD_LEVEL(x) (((x)&0xe0)>>5)
  45
  46 #define CFM_OPCODE_CCM 1
  47 #define CFM_OPCODE_LBR 2
  48 #define CFM_OPCODE_LBM 3
  49 #define CFM_OPCODE_LTR 4
  50 #define CFM_OPCODE_LTM 5
  51
  52 static const struct tok cfm_opcode_values[] = {
  53     { CFM_OPCODE_CCM, "Continuity Check Message"},
  54     { CFM_OPCODE_LBR, "Loopback Reply"},
  55     { CFM_OPCODE_LBM, "Loopback Message"},
  56     { CFM_OPCODE_LTR, "Linktrace Reply"},
  57     { CFM_OPCODE_LTM, "Linktrace Message"},
  58     { 0, NULL}
  59 };
  60
  61 /*
  62  * Message Formats.
  63  */
  64 struct cfm_ccm_t {
  65     nd_uint32_t sequence;
  66     nd_uint16_t ma_epi;
  67     nd_byte     names[48];
  68     nd_byte     itu_t_y_1731[16];
  69 };
  70
  71 /*
  72  * Timer Bases for the CCM Interval field.
  73  * Expressed in units of seconds.
  74  */
  75 static const float ccm_interval_base[8] = {0.0f, 0.003333f, 0.01f, 0.1f, 1.0f, 10.0f, 60.0f, 600.0f};
  76 #define CCM_INTERVAL_MIN_MULTIPLIER 3.25
  77 #define CCM_INTERVAL_MAX_MULTIPLIER 3.5
  78
  79 #define CFM_CCM_RDI_FLAG 0x80
  80 #define CFM_EXTRACT_CCM_INTERVAL(x) ((x)&0x07)
  81
  82 #define CFM_CCM_MD_FORMAT_8021 0
  83 #define CFM_CCM_MD_FORMAT_NONE 1
  84 #define CFM_CCM_MD_FORMAT_DNS  2
  85 #define CFM_CCM_MD_FORMAT_MAC  3
  86 #define CFM_CCM_MD_FORMAT_CHAR 4
  87
  88 static const struct tok cfm_md_nameformat_values[] = {
  89     { CFM_CCM_MD_FORMAT_8021, "IEEE 802.1"},
  90     { CFM_CCM_MD_FORMAT_NONE, "No MD Name present"},
  91     { CFM_CCM_MD_FORMAT_DNS, "DNS string"},
  92     { CFM_CCM_MD_FORMAT_MAC, "MAC + 16Bit Integer"},
  93     { CFM_CCM_MD_FORMAT_CHAR, "Character string"},
  94     { 0, NULL}
  95 };
  96
  97 #define CFM_CCM_MA_FORMAT_8021 0
  98 #define CFM_CCM_MA_FORMAT_VID  1
  99 #define CFM_CCM_MA_FORMAT_CHAR 2
 100 #define CFM_CCM_MA_FORMAT_INT  3
 101 #define CFM_CCM_MA_FORMAT_VPN  4
 102
 103 static const struct tok cfm_ma_nameformat_values[] = {
 104     { CFM_CCM_MA_FORMAT_8021, "IEEE 802.1"},
 105     { CFM_CCM_MA_FORMAT_VID, "Primary VID"},
 106     { CFM_CCM_MA_FORMAT_CHAR, "Character string"},
 107     { CFM_CCM_MA_FORMAT_INT, "16Bit Integer"},
 108     { CFM_CCM_MA_FORMAT_VPN, "RFC2685 VPN-ID"},
 109     { 0, NULL}
 110 };
 111
 112 struct cfm_lbm_t {
 113     nd_uint32_t transaction_id;
 114 };
 115
 116 struct cfm_ltm_t {
 117     nd_uint32_t transaction_id;
 118     nd_uint8_t  ttl;
 119     nd_mac_addr original_mac;
 120     nd_mac_addr target_mac;
 121 };
 122
 123 static const struct tok cfm_ltm_flag_values[] = {
 124     { 0x80, "Use Forwarding-DB only"},
 125     { 0, NULL}
 126 };
 127
 128 struct cfm_ltr_t {
 129     nd_uint32_t transaction_id;
 130     nd_uint8_t  ttl;
 131     nd_uint8_t  replay_action;
 132 };
 133
 134 static const struct tok cfm_ltr_flag_values[] = {
 135     { 0x80, "UseFDB Only"},
 136     { 0x40, "FwdYes"},
 137     { 0x20, "Terminal MEP"},
 138     { 0, NULL}
 139 };
 140
 141 static const struct tok cfm_ltr_replay_action_values[] = {
 142     { 1, "Exact Match"},
 143     { 2, "Filtering DB"},
 144     { 3, "MIP CCM DB"},
 145     { 0, NULL}
 146 };
 147
 148
 149 #define CFM_TLV_END 0
 150 #define CFM_TLV_SENDER_ID 1
 151 #define CFM_TLV_PORT_STATUS 2
 152 #define CFM_TLV_INTERFACE_STATUS 3
 153 #define CFM_TLV_DATA 4
 154 #define CFM_TLV_REPLY_INGRESS 5
 155 #define CFM_TLV_REPLY_EGRESS 6
 156 #define CFM_TLV_PRIVATE 31
 157
 158 static const struct tok cfm_tlv_values[] = {
 159     { CFM_TLV_END, "End"},
 160     { CFM_TLV_SENDER_ID, "Sender ID"},
 161     { CFM_TLV_PORT_STATUS, "Port status"},
 162     { CFM_TLV_INTERFACE_STATUS, "Interface status"},
 163     { CFM_TLV_DATA, "Data"},
 164     { CFM_TLV_REPLY_INGRESS, "Reply Ingress"},
 165     { CFM_TLV_REPLY_EGRESS, "Reply Egress"},
 166     { CFM_TLV_PRIVATE, "Organization Specific"},
 167     { 0, NULL}
 168 };
 169
 170 /*
 171  * TLVs
 172  */
 173
 174 struct cfm_tlv_header_t {
 175     nd_uint8_t  type;
 176     nd_uint16_t length;
 177 };
 178
 179 /* FIXME define TLV formats */
 180
 181 static const struct tok cfm_tlv_port_status_values[] = {
 182     { 1, "Blocked"},
 183     { 2, "Up"},
 184     { 0, NULL}
 185 };
 186
 187 static const struct tok cfm_tlv_interface_status_values[] = {
 188     { 1, "Up"},
 189     { 2, "Down"},
 190     { 3, "Testing"},
 191     { 5, "Dormant"},
 192     { 6, "not present"},
 193     { 7, "lower Layer down"},
 194     { 0, NULL}
 195 };
 196
 197 #define CFM_CHASSIS_ID_CHASSIS_COMPONENT 1
 198 #define CFM_CHASSIS_ID_INTERFACE_ALIAS 2
 199 #define CFM_CHASSIS_ID_PORT_COMPONENT 3
 200 #define CFM_CHASSIS_ID_MAC_ADDRESS 4
 201 #define CFM_CHASSIS_ID_NETWORK_ADDRESS 5
 202 #define CFM_CHASSIS_ID_INTERFACE_NAME 6
 203 #define CFM_CHASSIS_ID_LOCAL 7
 204
 205 static const struct tok cfm_tlv_senderid_chassisid_values[] = {
 206     { 0, "Reserved"},
 207     { CFM_CHASSIS_ID_CHASSIS_COMPONENT, "Chassis component"},
 208     { CFM_CHASSIS_ID_INTERFACE_ALIAS, "Interface alias"},
 209     { CFM_CHASSIS_ID_PORT_COMPONENT, "Port component"},
 210     { CFM_CHASSIS_ID_MAC_ADDRESS, "MAC address"},
 211     { CFM_CHASSIS_ID_NETWORK_ADDRESS, "Network address"},
 212     { CFM_CHASSIS_ID_INTERFACE_NAME, "Interface name"},
 213     { CFM_CHASSIS_ID_LOCAL, "Locally assigned"},
 214     { 0, NULL}
 215 };
 216
 217
 218 static int
 219 cfm_network_addr_print(netdissect_options *ndo,
 220                        const u_char *tptr, const u_int length)
 221 {
 222     u_int network_addr_type;
 223     u_int hexdump =  FALSE;
 224
 225     /*
 226      * Although AFIs are typically 2 octects wide,
 227      * 802.1ab specifies that this field width
 228      * is only one octet.
 229      */
 230     if (length < 1) {
 231         ND_PRINT("\n\t  Network Address Type (invalid, no data");
 232         return hexdump;
 233     }
 234     /* The calling function must make any due ND_TCHECK calls. */
 235     network_addr_type = GET_U_1(tptr);
 236     ND_PRINT("\n\t  Network Address Type %s (%u)",
 237            tok2str(af_values, "Unknown", network_addr_type),
 238            network_addr_type);
 239
 240     /*
 241      * Resolve the passed in Address.
 242      */
 243     switch(network_addr_type) {
 244     case AFNUM_INET:
 245         if (length != 1 + 4) {
 246             ND_PRINT("(invalid IPv4 address length %u)", length - 1);
 247             hexdump = TRUE;
 248             break;
 249         }
 250         ND_PRINT(", %s", ipaddr_string(ndo, tptr + 1));
 251         break;
 252
 253     case AFNUM_INET6:
 254         if (length != 1 + 16) {
 255             ND_PRINT("(invalid IPv6 address length %u)", length - 1);
 256             hexdump = TRUE;
 257             break;
 258         }
 259         ND_PRINT(", %s", ip6addr_string(ndo, tptr + 1));
 260         break;
 261
 262     default:
 263         hexdump = TRUE;
 264         break;
 265     }
 266
 267     return hexdump;
 268 }
 269
 270 void
 271 cfm_print(netdissect_options *ndo,
 272           const u_char *pptr, u_int length)
 273 {
 274     const struct cfm_common_header_t *cfm_common_header;
 275     uint8_t mdlevel_version, opcode, flags, first_tlv_offset;
 276     const struct cfm_tlv_header_t *cfm_tlv_header;
 277     const uint8_t *tptr, *tlv_ptr;
 278     const uint8_t *namesp;
 279     u_int names_data_remaining;
 280     uint8_t md_nameformat, md_namelength;
 281     const uint8_t *md_name;
 282     uint8_t ma_nameformat, ma_namelength;
 283     const uint8_t *ma_name;
 284     u_int hexdump, tlen, cfm_tlv_len, cfm_tlv_type, ccm_interval;
 285
 286
 287     union {
 288         const struct cfm_ccm_t *cfm_ccm;
 289         const struct cfm_lbm_t *cfm_lbm;
 290         const struct cfm_ltm_t *cfm_ltm;
 291         const struct cfm_ltr_t *cfm_ltr;
 292     } msg_ptr;
 293
 294     ndo->ndo_protocol = "cfm";
 295     tptr=pptr;
 296     cfm_common_header = (const struct cfm_common_header_t *)pptr;
 297     if (length < sizeof(*cfm_common_header))
 298         goto tooshort;
 299     ND_TCHECK_SIZE(cfm_common_header);
 300
 301     /*
 302      * Sanity checking of the header.
 303      */
 304     mdlevel_version = GET_U_1(cfm_common_header->mdlevel_version);
 305     if (CFM_EXTRACT_VERSION(mdlevel_version) != CFM_VERSION) {
 306         ND_PRINT("CFMv%u not supported, length %u",
 307                CFM_EXTRACT_VERSION(mdlevel_version), length);
 308         return;
 309     }
 310
 311     opcode = GET_U_1(cfm_common_header->opcode);
 312     ND_PRINT("CFMv%u %s, MD Level %u, length %u",
 313            CFM_EXTRACT_VERSION(mdlevel_version),
 314            tok2str(cfm_opcode_values, "unknown (%u)", opcode),
 315            CFM_EXTRACT_MD_LEVEL(mdlevel_version),
 316            length);
 317
 318     /*
 319      * In non-verbose mode just print the opcode and md-level.
 320      */
 321     if (ndo->ndo_vflag < 1) {
 322         return;
 323     }
 324
 325     flags = GET_U_1(cfm_common_header->flags);
 326     first_tlv_offset = GET_U_1(cfm_common_header->first_tlv_offset);
 327     ND_PRINT("\n\tFirst TLV offset %u", first_tlv_offset);
 328
 329     tptr += sizeof(struct cfm_common_header_t);
 330     tlen = length - sizeof(struct cfm_common_header_t);
 331
 332     /*
 333      * Sanity check the first TLV offset.
 334      */
 335     if (first_tlv_offset > tlen) {
 336         ND_PRINT(" (too large, must be <= %u)", tlen);
 337         return;
 338     }
 339
 340     switch (opcode) {
 341     case CFM_OPCODE_CCM:
 342         msg_ptr.cfm_ccm = (const struct cfm_ccm_t *)tptr;
 343         if (first_tlv_offset < sizeof(*msg_ptr.cfm_ccm)) {
 344             ND_PRINT(" (too small 1, must be >= %lu)",
 345                      (unsigned long) sizeof(*msg_ptr.cfm_ccm));
 346             return;
 347         }
 348         if (tlen < sizeof(*msg_ptr.cfm_ccm))
 349             goto tooshort;
 350         ND_TCHECK_SIZE(msg_ptr.cfm_ccm);
 351
 352         ccm_interval = CFM_EXTRACT_CCM_INTERVAL(flags);
 353         ND_PRINT(", Flags [CCM Interval %u%s]",
 354                ccm_interval,
 355                flags & CFM_CCM_RDI_FLAG ?
 356                ", RDI" : "");
 357
 358         /*
 359          * Resolve the CCM interval field.
 360          */
 361         if (ccm_interval) {
 362             ND_PRINT("\n\t  CCM Interval %.3fs"
 363                    ", min CCM Lifetime %.3fs, max CCM Lifetime %.3fs",
 364                    ccm_interval_base[ccm_interval],
 365                    ccm_interval_base[ccm_interval] * CCM_INTERVAL_MIN_MULTIPLIER,
 366                    ccm_interval_base[ccm_interval] * CCM_INTERVAL_MAX_MULTIPLIER);
 367         }
 368
 369         ND_PRINT("\n\t  Sequence Number 0x%08x, MA-End-Point-ID 0x%04x",
 370                GET_BE_U_4(msg_ptr.cfm_ccm->sequence),
 371                GET_BE_U_2(msg_ptr.cfm_ccm->ma_epi));
 372
 373         namesp = msg_ptr.cfm_ccm->names;
 374         names_data_remaining = sizeof(msg_ptr.cfm_ccm->names);
 375
 376         /*
 377          * Resolve the MD fields.
 378          */
 379         md_nameformat = GET_U_1(namesp);
 380         namesp++;
 381         names_data_remaining--;  /* We know this is != 0 */
 382         if (md_nameformat != CFM_CCM_MD_FORMAT_NONE) {
 383             md_namelength = GET_U_1(namesp);
 384             namesp++;
 385             names_data_remaining--; /* We know this is !=0 */
 386             ND_PRINT("\n\t  MD Name Format %s (%u), MD Name length %u",
 387                    tok2str(cfm_md_nameformat_values, "Unknown",
 388                            md_nameformat),
 389                    md_nameformat,
 390                    md_namelength);
 391
 392             /*
 393              * -3 for the MA short name format and length and one byte
 394              * of MA short name.
 395              */
 396             if (md_namelength > names_data_remaining - 3) {
 397                 ND_PRINT(" (too large, must be <= %u)", names_data_remaining - 2);
 398                 return;
 399             }
 400
 401             md_name = namesp;
 402             ND_PRINT("\n\t  MD Name: ");
 403             switch (md_nameformat) {
 404             case CFM_CCM_MD_FORMAT_DNS:
 405             case CFM_CCM_MD_FORMAT_CHAR:
 406                 (void)nd_printzp(ndo, md_name, md_namelength, NULL);
 407                 break;
 408
 409             case CFM_CCM_MD_FORMAT_MAC:
 410                 if (md_namelength == 6) {
 411                     ND_PRINT("\n\t  MAC %s", etheraddr_string(ndo,
 412                                md_name));
 413                 } else {
 414                     ND_PRINT("\n\t  MAC (length invalid)");
 415                 }
 416                 break;
 417
 418                 /* FIXME add printers for those MD formats - hexdump for now */
 419             case CFM_CCM_MA_FORMAT_8021:
 420             default:
 421                 print_unknown_data(ndo, md_name, "\n\t    ",
 422                                    md_namelength);
 423             }
 424             namesp += md_namelength;
 425             names_data_remaining -= md_namelength;
 426         } else {
 427             ND_PRINT("\n\t  MD Name Format %s (%u)",
 428                    tok2str(cfm_md_nameformat_values, "Unknown",
 429                            md_nameformat),
 430                    md_nameformat);
 431         }
 432
 433
 434         /*
 435          * Resolve the MA fields.
 436          */
 437         ma_nameformat = GET_U_1(namesp);
 438         namesp++;
 439         names_data_remaining--; /* We know this is != 0 */
 440         ma_namelength = GET_U_1(namesp);
 441         namesp++;
 442         names_data_remaining--; /* We know this is != 0 */
 443         ND_PRINT("\n\t  MA Name-Format %s (%u), MA name length %u",
 444                tok2str(cfm_ma_nameformat_values, "Unknown",
 445                        ma_nameformat),
 446                ma_nameformat,
 447                ma_namelength);
 448
 449         if (ma_namelength > names_data_remaining) {
 450             ND_PRINT(" (too large, must be <= %u)", names_data_remaining);
 451             return;
 452         }
 453
 454         ma_name = namesp;
 455         ND_PRINT("\n\t  MA Name: ");
 456         switch (ma_nameformat) {
 457         case CFM_CCM_MA_FORMAT_CHAR:
 458             (void)nd_printzp(ndo, ma_name, ma_namelength, NULL);
 459             break;
 460
 461             /* FIXME add printers for those MA formats - hexdump for now */
 462         case CFM_CCM_MA_FORMAT_8021:
 463         case CFM_CCM_MA_FORMAT_VID:
 464         case CFM_CCM_MA_FORMAT_INT:
 465         case CFM_CCM_MA_FORMAT_VPN:
 466         default:
 467             print_unknown_data(ndo, ma_name, "\n\t    ", ma_namelength);
 468         }
 469         break;
 470
 471     case CFM_OPCODE_LTM:
 472         msg_ptr.cfm_ltm = (const struct cfm_ltm_t *)tptr;
 473         if (first_tlv_offset < sizeof(*msg_ptr.cfm_ltm)) {
 474             ND_PRINT(" (too small 4, must be >= %lu)",
 475                      (unsigned long) sizeof(*msg_ptr.cfm_ltm));
 476             return;
 477         }
 478         if (tlen < sizeof(*msg_ptr.cfm_ltm))
 479             goto tooshort;
 480         ND_TCHECK_SIZE(msg_ptr.cfm_ltm);
 481
 482         ND_PRINT(", Flags [%s]",
 483                bittok2str(cfm_ltm_flag_values, "none", flags));
 484
 485         ND_PRINT("\n\t  Transaction-ID 0x%08x, ttl %u",
 486                GET_BE_U_4(msg_ptr.cfm_ltm->transaction_id),
 487                GET_U_1(msg_ptr.cfm_ltm->ttl));
 488
 489         ND_PRINT("\n\t  Original-MAC %s, Target-MAC %s",
 490                etheraddr_string(ndo, msg_ptr.cfm_ltm->original_mac),
 491                etheraddr_string(ndo, msg_ptr.cfm_ltm->target_mac));
 492         break;
 493
 494     case CFM_OPCODE_LTR:
 495         msg_ptr.cfm_ltr = (const struct cfm_ltr_t *)tptr;
 496         if (first_tlv_offset < sizeof(*msg_ptr.cfm_ltr)) {
 497             ND_PRINT(" (too small 5, must be >= %lu)",
 498                      (unsigned long) sizeof(*msg_ptr.cfm_ltr));
 499             return;
 500         }
 501         if (tlen < sizeof(*msg_ptr.cfm_ltr))
 502             goto tooshort;
 503         ND_TCHECK_SIZE(msg_ptr.cfm_ltr);
 504
 505         ND_PRINT(", Flags [%s]",
 506                bittok2str(cfm_ltr_flag_values, "none", flags));
 507
 508         ND_PRINT("\n\t  Transaction-ID 0x%08x, ttl %u",
 509                GET_BE_U_4(msg_ptr.cfm_ltr->transaction_id),
 510                GET_U_1(msg_ptr.cfm_ltr->ttl));
 511
 512         ND_PRINT("\n\t  Replay-Action %s (%u)",
 513                tok2str(cfm_ltr_replay_action_values,
 514                        "Unknown",
 515                        GET_U_1(msg_ptr.cfm_ltr->replay_action)),
 516                GET_U_1(msg_ptr.cfm_ltr->replay_action));
 517         break;
 518
 519         /*
 520          * No message decoder yet.
 521          * Hexdump everything up until the start of the TLVs
 522          */
 523     case CFM_OPCODE_LBR:
 524     case CFM_OPCODE_LBM:
 525     default:
 526         print_unknown_data(ndo, tptr, "\n\t  ",
 527                            tlen -  first_tlv_offset);
 528         break;
 529     }
 530
 531     tptr += first_tlv_offset;
 532     tlen -= first_tlv_offset;
 533
 534     while (tlen > 0) {
 535         cfm_tlv_header = (const struct cfm_tlv_header_t *)tptr;
 536
 537         /* Enough to read the tlv type ? */
 538         ND_TCHECK_1(cfm_tlv_header->type);
 539         cfm_tlv_type = GET_U_1(cfm_tlv_header->type);
 540
 541         ND_PRINT("\n\t%s TLV (0x%02x)",
 542                tok2str(cfm_tlv_values, "Unknown", cfm_tlv_type),
 543                cfm_tlv_type);
 544
 545         if (cfm_tlv_type == CFM_TLV_END) {
 546             /* Length is "Not present if the Type field is 0." */
 547             return;
 548         }
 549
 550         /* do we have the full tlv header ? */
 551         if (tlen < sizeof(struct cfm_tlv_header_t))
 552             goto tooshort;
 553         ND_TCHECK_LEN(tptr, sizeof(struct cfm_tlv_header_t));
 554         cfm_tlv_len=GET_BE_U_2(cfm_tlv_header->length);
 555
 556         ND_PRINT(", length %u", cfm_tlv_len);
 557
 558         tptr += sizeof(struct cfm_tlv_header_t);
 559         tlen -= sizeof(struct cfm_tlv_header_t);
 560         tlv_ptr = tptr;
 561
 562         /* do we have the full tlv ? */
 563         if (tlen < cfm_tlv_len)
 564             goto tooshort;
 565         ND_TCHECK_LEN(tptr, cfm_tlv_len);
 566         hexdump = FALSE;
 567
 568         switch(cfm_tlv_type) {
 569         case CFM_TLV_PORT_STATUS:
 570             if (cfm_tlv_len < 1) {
 571                 ND_PRINT(" (too short, must be >= 1)");
 572                 return;
 573             }
 574             ND_PRINT(", Status: %s (%u)",
 575                    tok2str(cfm_tlv_port_status_values, "Unknown", GET_U_1(tptr)),
 576                    GET_U_1(tptr));
 577             break;
 578
 579         case CFM_TLV_INTERFACE_STATUS:
 580             if (cfm_tlv_len < 1) {
 581                 ND_PRINT(" (too short, must be >= 1)");
 582                 return;
 583             }
 584             ND_PRINT(", Status: %s (%u)",
 585                    tok2str(cfm_tlv_interface_status_values, "Unknown", GET_U_1(tptr)),
 586                    GET_U_1(tptr));
 587             break;
 588
 589         case CFM_TLV_PRIVATE:
 590             if (cfm_tlv_len < 4) {
 591                 ND_PRINT(" (too short, must be >= 4)");
 592                 return;
 593             }
 594             ND_PRINT(", Vendor: %s (%u), Sub-Type %u",
 595                    tok2str(oui_values,"Unknown", GET_BE_U_3(tptr)),
 596                    GET_BE_U_3(tptr),
 597                    GET_U_1(tptr + 3));
 598             hexdump = TRUE;
 599             break;
 600
 601         case CFM_TLV_SENDER_ID:
 602         {
 603             u_int chassis_id_type, chassis_id_length;
 604             u_int mgmt_addr_length;
 605
 606             if (cfm_tlv_len < 1) {
 607                 ND_PRINT(" (too short, must be >= 1)");
 608                 goto next_tlv;
 609             }
 610
 611             /*
 612              * Get the Chassis ID length and check it.
 613              * IEEE 802.1Q-2014 Section 21.5.3.1
 614              */
 615             chassis_id_length = GET_U_1(tptr);
 616             tptr++;
 617             tlen--;
 618             cfm_tlv_len--;
 619
 620             if (chassis_id_length) {
 621                 /*
 622                  * IEEE 802.1Q-2014 Section 21.5.3.2: Chassis ID Subtype, references
 623                  * IEEE 802.1AB-2005 Section 9.5.2.2, subsequently
 624                  * IEEE 802.1AB-2016 Section 8.5.2.2: chassis ID subtype
 625                  */
 626                 if (cfm_tlv_len < 1) {
 627                     ND_PRINT("\n\t  (TLV too short)");
 628                     goto next_tlv;
 629                 }
 630                 chassis_id_type = GET_U_1(tptr);
 631                 cfm_tlv_len--;
 632                 ND_PRINT("\n\t  Chassis-ID Type %s (%u), Chassis-ID length %u",
 633                        tok2str(cfm_tlv_senderid_chassisid_values,
 634                                "Unknown",
 635                                chassis_id_type),
 636                        chassis_id_type,
 637                        chassis_id_length);
 638
 639                 if (cfm_tlv_len < chassis_id_length) {
 640                     ND_PRINT("\n\t  (TLV too short)");
 641                     goto next_tlv;
 642                 }
 643
 644                 /* IEEE 802.1Q-2014 Section 21.5.3.3: Chassis ID */
 645                 switch (chassis_id_type) {
 646                 case CFM_CHASSIS_ID_MAC_ADDRESS:
 647                     if (chassis_id_length != MAC_ADDR_LEN) {
 648                         ND_PRINT(" (invalid MAC address length)");
 649                         hexdump = TRUE;
 650                         break;
 651                     }
 652                     ND_PRINT("\n\t  MAC %s", etheraddr_string(ndo, tptr + 1));
 653                     break;
 654
 655                 case CFM_CHASSIS_ID_NETWORK_ADDRESS:
 656                     hexdump |= cfm_network_addr_print(ndo, tptr + 1, chassis_id_length);
 657                     break;
 658
 659                 case CFM_CHASSIS_ID_INTERFACE_NAME: /* fall through */
 660                 case CFM_CHASSIS_ID_INTERFACE_ALIAS:
 661                 case CFM_CHASSIS_ID_LOCAL:
 662                 case CFM_CHASSIS_ID_CHASSIS_COMPONENT:
 663                 case CFM_CHASSIS_ID_PORT_COMPONENT:
 664                     (void)nd_printzp(ndo, tptr + 1, chassis_id_length, NULL);
 665                     break;
 666
 667                 default:
 668                     hexdump = TRUE;
 669                     break;
 670                 }
 671                 cfm_tlv_len -= chassis_id_length;
 672
 673                 tptr += 1 + chassis_id_length;
 674                 tlen -= 1 + chassis_id_length;
 675             }
 676
 677             /*
 678              * Check if there is a Management Address.
 679              * IEEE 802.1Q-2014 Section 21.5.3.4: Management Address Domain Length
 680              * This and all subsequent fields are not present if the TLV length
 681              * allows only the above fields.
 682              */
 683             if (cfm_tlv_len == 0) {
 684                 /* No, there isn't; we're done. */
 685                 break;
 686             }
 687
 688             /* Here mgmt_addr_length stands for the management domain length. */
 689             mgmt_addr_length = GET_U_1(tptr);
 690             tptr++;
 691             tlen--;
 692             cfm_tlv_len--;
 693             ND_PRINT("\n\t  Management Address Domain Length %u", mgmt_addr_length);
 694             if (mgmt_addr_length) {
 695                 /* IEEE 802.1Q-2014 Section 21.5.3.5: Management Address Domain */
 696                 if (cfm_tlv_len < mgmt_addr_length) {
 697                     ND_PRINT("\n\t  (TLV too short)");
 698                     goto next_tlv;
 699                 }
 700                 cfm_tlv_len -= mgmt_addr_length;
 701                 /*
 702                  * XXX - this is an OID; print it as such.
 703                  */
 704                 hex_print(ndo, "\n\t  Management Address Domain: ", tptr, mgmt_addr_length);
 705                 tptr += mgmt_addr_length;
 706                 tlen -= mgmt_addr_length;
 707
 708                 /*
 709                  * IEEE 802.1Q-2014 Section 21.5.3.6: Management Address Length
 710                  * This field is present if Management Address Domain Length is not 0.
 711                  */
 712                 if (cfm_tlv_len < 1) {
 713                     ND_PRINT(" (Management Address Length is missing)");
 714                     hexdump = TRUE;
 715                     break;
 716                 }
 717
 718                 /* Here mgmt_addr_length stands for the management address length. */
 719                 mgmt_addr_length = GET_U_1(tptr);
 720                 tptr++;
 721                 tlen--;
 722                 cfm_tlv_len--;
 723                 ND_PRINT("\n\t  Management Address Length %u", mgmt_addr_length);
 724                 if (mgmt_addr_length) {
 725                     /* IEEE 802.1Q-2014 Section 21.5.3.7: Management Address */
 726                     if (cfm_tlv_len < mgmt_addr_length) {
 727                         ND_PRINT("\n\t  (TLV too short)");
 728                         return;
 729                     }
 730                     cfm_tlv_len -= mgmt_addr_length;
 731                     /*
 732                      * XXX - this is a TransportDomain; print it as such.
 733                      */
 734                     hex_print(ndo, "\n\t  Management Address: ", tptr, mgmt_addr_length);
 735                     tptr += mgmt_addr_length;
 736                     tlen -= mgmt_addr_length;
 737                 }
 738             }
 739             break;
 740         }
 741
 742             /*
 743              * FIXME those are the defined TLVs that lack a decoder
 744              * you are welcome to contribute code ;-)
 745              */
 746
 747         case CFM_TLV_DATA:
 748         case CFM_TLV_REPLY_INGRESS:
 749         case CFM_TLV_REPLY_EGRESS:
 750         default:
 751             hexdump = TRUE;
 752             break;
 753         }
 754         /* do we want to see an additional hexdump ? */
 755         if (hexdump || ndo->ndo_vflag > 1)
 756             print_unknown_data(ndo, tlv_ptr, "\n\t  ", cfm_tlv_len);
 757
 758 next_tlv:
 759         tptr+=cfm_tlv_len;
 760         tlen-=cfm_tlv_len;
 761     }
 762     return;
 763
 764 tooshort:
 765     ND_PRINT("\n\t\t packet is too short");
 766     return;
 767
 768 trunc:
 769     nd_print_trunc(ndo);
 770 }