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
  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", GET_IPADDR_STRING(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", GET_IP6ADDR_STRING(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 >= %zu)",
 345                      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", GET_ETHERADDR_STRING(md_name));
 412                 } else {
 413                     ND_PRINT("\n\t  MAC (length invalid)");
 414                 }
 415                 break;
 416
 417                 /* FIXME add printers for those MD formats - hexdump for now */
 418             case CFM_CCM_MA_FORMAT_8021:
 419             default:
 420                 print_unknown_data(ndo, md_name, "\n\t    ",
 421                                    md_namelength);
 422             }
 423             namesp += md_namelength;
 424             names_data_remaining -= md_namelength;
 425         } else {
 426             ND_PRINT("\n\t  MD Name Format %s (%u)",
 427                    tok2str(cfm_md_nameformat_values, "Unknown",
 428                            md_nameformat),
 429                    md_nameformat);
 430         }
 431
 432
 433         /*
 434          * Resolve the MA fields.
 435          */
 436         ma_nameformat = GET_U_1(namesp);
 437         namesp++;
 438         names_data_remaining--; /* We know this is != 0 */
 439         ma_namelength = GET_U_1(namesp);
 440         namesp++;
 441         names_data_remaining--; /* We know this is != 0 */
 442         ND_PRINT("\n\t  MA Name-Format %s (%u), MA name length %u",
 443                tok2str(cfm_ma_nameformat_values, "Unknown",
 444                        ma_nameformat),
 445                ma_nameformat,
 446                ma_namelength);
 447
 448         if (ma_namelength > names_data_remaining) {
 449             ND_PRINT(" (too large, must be <= %u)", names_data_remaining);
 450             return;
 451         }
 452
 453         ma_name = namesp;
 454         ND_PRINT("\n\t  MA Name: ");
 455         switch (ma_nameformat) {
 456         case CFM_CCM_MA_FORMAT_CHAR:
 457             (void)nd_printzp(ndo, ma_name, ma_namelength, NULL);
 458             break;
 459
 460             /* FIXME add printers for those MA formats - hexdump for now */
 461         case CFM_CCM_MA_FORMAT_8021:
 462         case CFM_CCM_MA_FORMAT_VID:
 463         case CFM_CCM_MA_FORMAT_INT:
 464         case CFM_CCM_MA_FORMAT_VPN:
 465         default:
 466             print_unknown_data(ndo, ma_name, "\n\t    ", ma_namelength);
 467         }
 468         break;
 469
 470     case CFM_OPCODE_LTM:
 471         msg_ptr.cfm_ltm = (const struct cfm_ltm_t *)tptr;
 472         if (first_tlv_offset < sizeof(*msg_ptr.cfm_ltm)) {
 473             ND_PRINT(" (too small 4, must be >= %zu)",
 474                      sizeof(*msg_ptr.cfm_ltm));
 475             return;
 476         }
 477         if (tlen < sizeof(*msg_ptr.cfm_ltm))
 478             goto tooshort;
 479         ND_TCHECK_SIZE(msg_ptr.cfm_ltm);
 480
 481         ND_PRINT(", Flags [%s]",
 482                bittok2str(cfm_ltm_flag_values, "none", flags));
 483
 484         ND_PRINT("\n\t  Transaction-ID 0x%08x, ttl %u",
 485                GET_BE_U_4(msg_ptr.cfm_ltm->transaction_id),
 486                GET_U_1(msg_ptr.cfm_ltm->ttl));
 487
 488         ND_PRINT("\n\t  Original-MAC %s, Target-MAC %s",
 489                GET_ETHERADDR_STRING(msg_ptr.cfm_ltm->original_mac),
 490                GET_ETHERADDR_STRING(msg_ptr.cfm_ltm->target_mac));
 491         break;
 492
 493     case CFM_OPCODE_LTR:
 494         msg_ptr.cfm_ltr = (const struct cfm_ltr_t *)tptr;
 495         if (first_tlv_offset < sizeof(*msg_ptr.cfm_ltr)) {
 496             ND_PRINT(" (too small 5, must be >= %zu)",
 497                      sizeof(*msg_ptr.cfm_ltr));
 498             return;
 499         }
 500         if (tlen < sizeof(*msg_ptr.cfm_ltr))
 501             goto tooshort;
 502         ND_TCHECK_SIZE(msg_ptr.cfm_ltr);
 503
 504         ND_PRINT(", Flags [%s]",
 505                bittok2str(cfm_ltr_flag_values, "none", flags));
 506
 507         ND_PRINT("\n\t  Transaction-ID 0x%08x, ttl %u",
 508                GET_BE_U_4(msg_ptr.cfm_ltr->transaction_id),
 509                GET_U_1(msg_ptr.cfm_ltr->ttl));
 510
 511         ND_PRINT("\n\t  Replay-Action %s (%u)",
 512                tok2str(cfm_ltr_replay_action_values,
 513                        "Unknown",
 514                        GET_U_1(msg_ptr.cfm_ltr->replay_action)),
 515                GET_U_1(msg_ptr.cfm_ltr->replay_action));
 516         break;
 517
 518         /*
 519          * No message decoder yet.
 520          * Hexdump everything up until the start of the TLVs
 521          */
 522     case CFM_OPCODE_LBR:
 523     case CFM_OPCODE_LBM:
 524     default:
 525         print_unknown_data(ndo, tptr, "\n\t  ",
 526                            tlen -  first_tlv_offset);
 527         break;
 528     }
 529
 530     tptr += first_tlv_offset;
 531     tlen -= first_tlv_offset;
 532
 533     while (tlen > 0) {
 534         cfm_tlv_header = (const struct cfm_tlv_header_t *)tptr;
 535
 536         /* Enough to read the tlv type ? */
 537         cfm_tlv_type = GET_U_1(cfm_tlv_header->type);
 538
 539         ND_PRINT("\n\t%s TLV (0x%02x)",
 540                tok2str(cfm_tlv_values, "Unknown", cfm_tlv_type),
 541                cfm_tlv_type);
 542
 543         if (cfm_tlv_type == CFM_TLV_END) {
 544             /* Length is "Not present if the Type field is 0." */
 545             return;
 546         }
 547
 548         /* do we have the full tlv header ? */
 549         if (tlen < sizeof(struct cfm_tlv_header_t))
 550             goto tooshort;
 551         ND_TCHECK_LEN(tptr, sizeof(struct cfm_tlv_header_t));
 552         cfm_tlv_len=GET_BE_U_2(cfm_tlv_header->length);
 553
 554         ND_PRINT(", length %u", cfm_tlv_len);
 555
 556         tptr += sizeof(struct cfm_tlv_header_t);
 557         tlen -= sizeof(struct cfm_tlv_header_t);
 558         tlv_ptr = tptr;
 559
 560         /* do we have the full tlv ? */
 561         if (tlen < cfm_tlv_len)
 562             goto tooshort;
 563         ND_TCHECK_LEN(tptr, cfm_tlv_len);
 564         hexdump = FALSE;
 565
 566         switch(cfm_tlv_type) {
 567         case CFM_TLV_PORT_STATUS:
 568             if (cfm_tlv_len < 1) {
 569                 ND_PRINT(" (too short, must be >= 1)");
 570                 return;
 571             }
 572             ND_PRINT(", Status: %s (%u)",
 573                    tok2str(cfm_tlv_port_status_values, "Unknown", GET_U_1(tptr)),
 574                    GET_U_1(tptr));
 575             break;
 576
 577         case CFM_TLV_INTERFACE_STATUS:
 578             if (cfm_tlv_len < 1) {
 579                 ND_PRINT(" (too short, must be >= 1)");
 580                 return;
 581             }
 582             ND_PRINT(", Status: %s (%u)",
 583                    tok2str(cfm_tlv_interface_status_values, "Unknown", GET_U_1(tptr)),
 584                    GET_U_1(tptr));
 585             break;
 586
 587         case CFM_TLV_PRIVATE:
 588             if (cfm_tlv_len < 4) {
 589                 ND_PRINT(" (too short, must be >= 4)");
 590                 return;
 591             }
 592             ND_PRINT(", Vendor: %s (%u), Sub-Type %u",
 593                    tok2str(oui_values,"Unknown", GET_BE_U_3(tptr)),
 594                    GET_BE_U_3(tptr),
 595                    GET_U_1(tptr + 3));
 596             hexdump = TRUE;
 597             break;
 598
 599         case CFM_TLV_SENDER_ID:
 600         {
 601             u_int chassis_id_type, chassis_id_length;
 602             u_int mgmt_addr_length;
 603
 604             if (cfm_tlv_len < 1) {
 605                 ND_PRINT(" (too short, must be >= 1)");
 606                 goto next_tlv;
 607             }
 608
 609             /*
 610              * Get the Chassis ID length and check it.
 611              * IEEE 802.1Q-2014 Section 21.5.3.1
 612              */
 613             chassis_id_length = GET_U_1(tptr);
 614             tptr++;
 615             tlen--;
 616             cfm_tlv_len--;
 617
 618             if (chassis_id_length) {
 619                 /*
 620                  * IEEE 802.1Q-2014 Section 21.5.3.2: Chassis ID Subtype, references
 621                  * IEEE 802.1AB-2005 Section 9.5.2.2, subsequently
 622                  * IEEE 802.1AB-2016 Section 8.5.2.2: chassis ID subtype
 623                  */
 624                 if (cfm_tlv_len < 1) {
 625                     ND_PRINT("\n\t  (TLV too short)");
 626                     goto next_tlv;
 627                 }
 628                 chassis_id_type = GET_U_1(tptr);
 629                 cfm_tlv_len--;
 630                 ND_PRINT("\n\t  Chassis-ID Type %s (%u), Chassis-ID length %u",
 631                        tok2str(cfm_tlv_senderid_chassisid_values,
 632                                "Unknown",
 633                                chassis_id_type),
 634                        chassis_id_type,
 635                        chassis_id_length);
 636
 637                 if (cfm_tlv_len < chassis_id_length) {
 638                     ND_PRINT("\n\t  (TLV too short)");
 639                     goto next_tlv;
 640                 }
 641
 642                 /* IEEE 802.1Q-2014 Section 21.5.3.3: Chassis ID */
 643                 switch (chassis_id_type) {
 644                 case CFM_CHASSIS_ID_MAC_ADDRESS:
 645                     if (chassis_id_length != MAC_ADDR_LEN) {
 646                         ND_PRINT(" (invalid MAC address length)");
 647                         hexdump = TRUE;
 648                         break;
 649                     }
 650                     ND_PRINT("\n\t  MAC %s", GET_ETHERADDR_STRING(tptr + 1));
 651                     break;
 652
 653                 case CFM_CHASSIS_ID_NETWORK_ADDRESS:
 654                     hexdump |= cfm_network_addr_print(ndo, tptr + 1, chassis_id_length);
 655                     break;
 656
 657                 case CFM_CHASSIS_ID_INTERFACE_NAME: /* fall through */
 658                 case CFM_CHASSIS_ID_INTERFACE_ALIAS:
 659                 case CFM_CHASSIS_ID_LOCAL:
 660                 case CFM_CHASSIS_ID_CHASSIS_COMPONENT:
 661                 case CFM_CHASSIS_ID_PORT_COMPONENT:
 662                     (void)nd_printzp(ndo, tptr + 1, chassis_id_length, NULL);
 663                     break;
 664
 665                 default:
 666                     hexdump = TRUE;
 667                     break;
 668                 }
 669                 cfm_tlv_len -= chassis_id_length;
 670
 671                 tptr += 1 + chassis_id_length;
 672                 tlen -= 1 + chassis_id_length;
 673             }
 674
 675             /*
 676              * Check if there is a Management Address.
 677              * IEEE 802.1Q-2014 Section 21.5.3.4: Management Address Domain Length
 678              * This and all subsequent fields are not present if the TLV length
 679              * allows only the above fields.
 680              */
 681             if (cfm_tlv_len == 0) {
 682                 /* No, there isn't; we're done. */
 683                 break;
 684             }
 685
 686             /* Here mgmt_addr_length stands for the management domain length. */
 687             mgmt_addr_length = GET_U_1(tptr);
 688             tptr++;
 689             tlen--;
 690             cfm_tlv_len--;
 691             ND_PRINT("\n\t  Management Address Domain Length %u", mgmt_addr_length);
 692             if (mgmt_addr_length) {
 693                 /* IEEE 802.1Q-2014 Section 21.5.3.5: Management Address Domain */
 694                 if (cfm_tlv_len < mgmt_addr_length) {
 695                     ND_PRINT("\n\t  (TLV too short)");
 696                     goto next_tlv;
 697                 }
 698                 cfm_tlv_len -= mgmt_addr_length;
 699                 /*
 700                  * XXX - this is an OID; print it as such.
 701                  */
 702                 hex_print(ndo, "\n\t  Management Address Domain: ", tptr, mgmt_addr_length);
 703                 tptr += mgmt_addr_length;
 704                 tlen -= mgmt_addr_length;
 705
 706                 /*
 707                  * IEEE 802.1Q-2014 Section 21.5.3.6: Management Address Length
 708                  * This field is present if Management Address Domain Length is not 0.
 709                  */
 710                 if (cfm_tlv_len < 1) {
 711                     ND_PRINT(" (Management Address Length is missing)");
 712                     hexdump = TRUE;
 713                     break;
 714                 }
 715
 716                 /* Here mgmt_addr_length stands for the management address length. */
 717                 mgmt_addr_length = GET_U_1(tptr);
 718                 tptr++;
 719                 tlen--;
 720                 cfm_tlv_len--;
 721                 ND_PRINT("\n\t  Management Address Length %u", mgmt_addr_length);
 722                 if (mgmt_addr_length) {
 723                     /* IEEE 802.1Q-2014 Section 21.5.3.7: Management Address */
 724                     if (cfm_tlv_len < mgmt_addr_length) {
 725                         ND_PRINT("\n\t  (TLV too short)");
 726                         return;
 727                     }
 728                     cfm_tlv_len -= mgmt_addr_length;
 729                     /*
 730                      * XXX - this is a TransportDomain; print it as such.
 731                      */
 732                     hex_print(ndo, "\n\t  Management Address: ", tptr, mgmt_addr_length);
 733                     tptr += mgmt_addr_length;
 734                     tlen -= mgmt_addr_length;
 735                 }
 736             }
 737             break;
 738         }
 739
 740             /*
 741              * FIXME those are the defined TLVs that lack a decoder
 742              * you are welcome to contribute code ;-)
 743              */
 744
 745         case CFM_TLV_DATA:
 746         case CFM_TLV_REPLY_INGRESS:
 747         case CFM_TLV_REPLY_EGRESS:
 748         default:
 749             hexdump = TRUE;
 750             break;
 751         }
 752         /* do we want to see an additional hexdump ? */
 753         if (hexdump || ndo->ndo_vflag > 1)
 754             print_unknown_data(ndo, tlv_ptr, "\n\t  ", cfm_tlv_len);
 755
 756 next_tlv:
 757         tptr+=cfm_tlv_len;
 758         tlen-=cfm_tlv_len;
 759     }
 760     return;
 761
 762 tooshort:
 763     ND_PRINT("\n\t\t packet is too short");
 764     return;
 765
 766 trunc:
 767     nd_print_trunc(ndo);
 768 }