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  * 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 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include <tcpdump-stdinc.h>
  25
  26 #include <stdio.h>
  27
  28 #include "interface.h"
  29 #include "extract.h"
  30 #include "ether.h"
  31 #include "addrtoname.h"
  32 #include "oui.h"
  33 #include "af.h"
  34
  35 struct cfm_common_header_t {
  36     uint8_t mdlevel_version;
  37     uint8_t opcode;
  38     uint8_t flags;
  39     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, "Continouity 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     uint8_t sequence[4];
  66     uint8_t ma_epi[2];
  67     uint8_t md_nameformat;
  68     uint8_t md_namelength;
  69     uint8_t md_name[46]; /* md name and short ma name */
  70     uint8_t reserved_itu[16];
  71     uint8_t reserved[6];
  72 };
  73
  74 /*
  75  * Timer Bases for the CCM Interval field.
  76  * Expressed in units of seconds.
  77  */
  78 const float ccm_interval_base[8] = {0, 0.003333, 0.01, 0.1, 1, 10, 60, 600};
  79 #define CCM_INTERVAL_MIN_MULTIPLIER 3.25
  80 #define CCM_INTERVAL_MAX_MULTIPLIER 3.5
  81
  82 #define CFM_CCM_RDI_FLAG 0x80
  83 #define CFM_EXTRACT_CCM_INTERVAL(x) (((x)&0x07))
  84
  85 #define CFM_CCM_MD_FORMAT_8021 0
  86 #define CFM_CCM_MD_FORMAT_NONE 1
  87 #define CFM_CCM_MD_FORMAT_DNS  2
  88 #define CFM_CCM_MD_FORMAT_MAC  3
  89 #define CFM_CCM_MD_FORMAT_CHAR 4
  90
  91 static const struct tok cfm_md_nameformat_values[] = {
  92     { CFM_CCM_MD_FORMAT_8021, "IEEE 802.1"},
  93     { CFM_CCM_MD_FORMAT_NONE, "No MD Name present"},
  94     { CFM_CCM_MD_FORMAT_DNS, "DNS string"},
  95     { CFM_CCM_MD_FORMAT_MAC, "MAC + 16Bit Integer"},
  96     { CFM_CCM_MD_FORMAT_CHAR, "Character string"},
  97     { 0, NULL}
  98 };
  99
 100 #define CFM_CCM_MA_FORMAT_8021 0
 101 #define CFM_CCM_MA_FORMAT_VID  1
 102 #define CFM_CCM_MA_FORMAT_CHAR 2
 103 #define CFM_CCM_MA_FORMAT_INT  3
 104 #define CFM_CCM_MA_FORMAT_VPN  4
 105
 106 static const struct tok cfm_ma_nameformat_values[] = {
 107     { CFM_CCM_MA_FORMAT_8021, "IEEE 802.1"},
 108     { CFM_CCM_MA_FORMAT_VID, "Primary VID"},
 109     { CFM_CCM_MA_FORMAT_CHAR, "Character string"},
 110     { CFM_CCM_MA_FORMAT_INT, "16Bit Integer"},
 111     { CFM_CCM_MA_FORMAT_VPN, "RFC2685 VPN-ID"},
 112     { 0, NULL}
 113 };
 114
 115 struct cfm_lbm_t {
 116     uint8_t transaction_id[4];
 117     uint8_t reserved[4];
 118 };
 119
 120 struct cfm_ltm_t {
 121     uint8_t transaction_id[4];
 122     uint8_t egress_id[8];
 123     uint8_t ttl;
 124     uint8_t original_mac[ETHER_ADDR_LEN];
 125     uint8_t target_mac[ETHER_ADDR_LEN];
 126     uint8_t reserved[3];
 127 };
 128
 129 static const struct tok cfm_ltm_flag_values[] = {
 130     { 0x80, "Use Forwarding-DB only"},
 131     { 0, NULL}
 132 };
 133
 134 struct cfm_ltr_t {
 135     uint8_t transaction_id[4];
 136     uint8_t last_egress_id[8];
 137     uint8_t next_egress_id[8];
 138     uint8_t ttl;
 139     uint8_t replay_action;
 140     uint8_t reserved[6];
 141 };
 142
 143 static const struct tok cfm_ltr_flag_values[] = {
 144     { 0x80, "UseFDB Only"},
 145     { 0x40, "FwdYes"},
 146     { 0x20, "Terminal MEP"},
 147     { 0, NULL}
 148 };
 149
 150 static const struct tok cfm_ltr_replay_action_values[] = {
 151     { 1, "Exact Match"},
 152     { 2, "Filtering DB"},
 153     { 3, "MIP CCM DB"},
 154     { 0, NULL}
 155 };
 156
 157
 158 #define CFM_TLV_END 0
 159 #define CFM_TLV_SENDER_ID 1
 160 #define CFM_TLV_PORT_STATUS 2
 161 #define CFM_TLV_INTERFACE_STATUS 3
 162 #define CFM_TLV_DATA 4
 163 #define CFM_TLV_REPLY_INGRESS 5
 164 #define CFM_TLV_REPLY_EGRESS 6
 165 #define CFM_TLV_PRIVATE 31
 166
 167 static const struct tok cfm_tlv_values[] = {
 168     { CFM_TLV_END, "End"},
 169     { CFM_TLV_SENDER_ID, "Sender ID"},
 170     { CFM_TLV_PORT_STATUS, "Port status"},
 171     { CFM_TLV_INTERFACE_STATUS, "Interface status"},
 172     { CFM_TLV_DATA, "Data"},
 173     { CFM_TLV_REPLY_INGRESS, "Reply Ingress"},
 174     { CFM_TLV_REPLY_EGRESS, "Reply Egress"},
 175     { CFM_TLV_PRIVATE, "Organization Specific"},
 176     { 0, NULL}
 177 };
 178
 179 /*
 180  * TLVs
 181  */
 182
 183 struct cfm_tlv_header_t {
 184     uint8_t type;
 185     uint8_t length[2];
 186 };
 187
 188 /* FIXME define TLV formats */
 189
 190 static const struct tok cfm_tlv_port_status_values[] = {
 191     { 1, "Blocked"},
 192     { 2, "Up"},
 193     { 0, NULL}
 194 };
 195
 196 static const struct tok cfm_tlv_interface_status_values[] = {
 197     { 1, "Up"},
 198     { 2, "Down"},
 199     { 3, "Testing"},
 200     { 5, "Dormant"},
 201     { 6, "not present"},
 202     { 7, "lower Layer down"},
 203     { 0, NULL}
 204 };
 205
 206 #define CFM_CHASSIS_ID_CHASSIS_COMPONENT 1
 207 #define CFM_CHASSIS_ID_INTERFACE_ALIAS 2
 208 #define CFM_CHASSIS_ID_PORT_COMPONENT 3
 209 #define CFM_CHASSIS_ID_MAC_ADDRESS 4
 210 #define CFM_CHASSIS_ID_NETWORK_ADDRESS 5
 211 #define CFM_CHASSIS_ID_INTERFACE_NAME 6
 212 #define CFM_CHASSIS_ID_LOCAL 7
 213
 214 static const struct tok cfm_tlv_senderid_chassisid_values[] = {
 215     { 0, "Reserved"},
 216     { CFM_CHASSIS_ID_CHASSIS_COMPONENT, "Chassis component"},
 217     { CFM_CHASSIS_ID_INTERFACE_ALIAS, "Interface alias"},
 218     { CFM_CHASSIS_ID_PORT_COMPONENT, "Port component"},
 219     { CFM_CHASSIS_ID_MAC_ADDRESS, "MAC address"},
 220     { CFM_CHASSIS_ID_NETWORK_ADDRESS, "Network address"},
 221     { CFM_CHASSIS_ID_INTERFACE_NAME, "Interface name"},
 222     { CFM_CHASSIS_ID_LOCAL, "Locally assigned"},
 223     { 0, NULL}
 224 };
 225
 226
 227 static int
 228 cfm_mgmt_addr_print(netdissect_options *ndo,
 229                     register const u_char *tptr)
 230 {
 231     u_int mgmt_addr_type;
 232     u_int hexdump =  FALSE;
 233
 234     /*
 235      * Altough AFIs are tpically 2 octects wide,
 236      * 802.1ab specifies that this field width
 237      * is only once octet
 238      */
 239     mgmt_addr_type = *tptr;
 240     ND_PRINT((ndo, "\n\t  Management Address Type %s (%u)",
 241            tok2str(af_values, "Unknown", mgmt_addr_type),
 242            mgmt_addr_type));
 243
 244     /*
 245      * Resolve the passed in Address.
 246      */
 247     switch(mgmt_addr_type) {
 248     case AFNUM_INET:
 249         ND_PRINT((ndo, ", %s", ipaddr_string(ndo, tptr + 1)));
 250         break;
 251
 252 #ifdef INET6
 253     case AFNUM_INET6:
 254         ND_PRINT((ndo, ", %s", ip6addr_string(ndo, tptr + 1)));
 255         break;
 256 #endif
 257
 258     default:
 259         hexdump = TRUE;
 260         break;
 261     }
 262
 263     return hexdump;
 264 }
 265
 266 /*
 267  * The egress-ID string is a 16-Bit string plus a MAC address.
 268  */
 269 static const char *
 270 cfm_egress_id_string(netdissect_options *ndo, register const u_char *tptr)
 271 {
 272     static char egress_id_buffer[80];
 273
 274     snprintf(egress_id_buffer, sizeof(egress_id_buffer),
 275              "MAC 0x%4x-%s",
 276              EXTRACT_16BITS(tptr),
 277              etheraddr_string(ndo, tptr+2));
 278
 279     return egress_id_buffer;
 280 }
 281
 282 void
 283 cfm_print(netdissect_options *ndo,
 284           register const u_char *pptr, register u_int length)
 285 {
 286     const struct cfm_common_header_t *cfm_common_header;
 287     const struct cfm_tlv_header_t *cfm_tlv_header;
 288     const uint8_t *tptr, *tlv_ptr, *ma_name, *ma_nameformat, *ma_namelength;
 289     u_int hexdump, tlen, cfm_tlv_len, cfm_tlv_type, ccm_interval;
 290
 291
 292     union {
 293         const struct cfm_ccm_t *cfm_ccm;
 294         const struct cfm_lbm_t *cfm_lbm;
 295         const struct cfm_ltm_t *cfm_ltm;
 296         const struct cfm_ltr_t *cfm_ltr;
 297     } msg_ptr;
 298
 299     tptr=pptr;
 300     cfm_common_header = (const struct cfm_common_header_t *)pptr;
 301     ND_TCHECK(*cfm_common_header);
 302
 303     /*
 304      * Sanity checking of the header.
 305      */
 306     if (CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version) != CFM_VERSION) {
 307         ND_PRINT((ndo, "CFMv%u not supported, length %u",
 308                CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version), length));
 309         return;
 310     }
 311
 312     ND_PRINT((ndo, "CFMv%u %s, MD Level %u, length %u",
 313            CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version),
 314            tok2str(cfm_opcode_values, "unknown (%u)", cfm_common_header->opcode),
 315            CFM_EXTRACT_MD_LEVEL(cfm_common_header->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     ND_PRINT((ndo, "\n\tFirst TLV offset %u", cfm_common_header->first_tlv_offset));
 326
 327     tptr += sizeof(const struct cfm_common_header_t);
 328     tlen = length - sizeof(struct cfm_common_header_t);
 329
 330     switch (cfm_common_header->opcode) {
 331     case CFM_OPCODE_CCM:
 332         msg_ptr.cfm_ccm = (const struct cfm_ccm_t *)tptr;
 333
 334         ccm_interval = CFM_EXTRACT_CCM_INTERVAL(cfm_common_header->flags);
 335         ND_PRINT((ndo, ", Flags [CCM Interval %u%s]",
 336                ccm_interval,
 337                cfm_common_header->flags & CFM_CCM_RDI_FLAG ?
 338                ", RDI" : ""));
 339
 340         /*
 341          * Resolve the CCM interval field.
 342          */
 343         if (ccm_interval) {
 344             ND_PRINT((ndo, "\n\t  CCM Interval %.3fs"
 345                    ", min CCM Lifetime %.3fs, max CCM Lifetime %.3fs",
 346                    ccm_interval_base[ccm_interval],
 347                    ccm_interval_base[ccm_interval] * CCM_INTERVAL_MIN_MULTIPLIER,
 348                    ccm_interval_base[ccm_interval] * CCM_INTERVAL_MAX_MULTIPLIER));
 349         }
 350
 351         ND_PRINT((ndo, "\n\t  Sequence Number 0x%08x, MA-End-Point-ID 0x%04x",
 352                EXTRACT_32BITS(msg_ptr.cfm_ccm->sequence),
 353                EXTRACT_16BITS(msg_ptr.cfm_ccm->ma_epi)));
 354
 355
 356         /*
 357          * Resolve the MD fields.
 358          */
 359         ND_PRINT((ndo, "\n\t  MD Name Format %s (%u), MD Name length %u",
 360                tok2str(cfm_md_nameformat_values, "Unknown",
 361                        msg_ptr.cfm_ccm->md_nameformat),
 362                msg_ptr.cfm_ccm->md_nameformat,
 363                msg_ptr.cfm_ccm->md_namelength));
 364
 365         if (msg_ptr.cfm_ccm->md_nameformat != CFM_CCM_MD_FORMAT_NONE) {
 366             ND_PRINT((ndo, "\n\t  MD Name: "));
 367             switch (msg_ptr.cfm_ccm->md_nameformat) {
 368             case CFM_CCM_MD_FORMAT_DNS:
 369             case CFM_CCM_MD_FORMAT_CHAR:
 370                 safeputs(ndo, msg_ptr.cfm_ccm->md_name, msg_ptr.cfm_ccm->md_namelength);
 371                 break;
 372
 373             case CFM_CCM_MD_FORMAT_MAC:
 374                 ND_PRINT((ndo, "\n\t  MAC %s", etheraddr_string(ndo,
 375                            msg_ptr.cfm_ccm->md_name)));
 376                 break;
 377
 378                 /* FIXME add printers for those MD formats - hexdump for now */
 379             case CFM_CCM_MA_FORMAT_8021:
 380             default:
 381                 print_unknown_data(ndo, msg_ptr.cfm_ccm->md_name, "\n\t    ",
 382                                    msg_ptr.cfm_ccm->md_namelength);
 383             }
 384         }
 385
 386
 387         /*
 388          * Resolve the MA fields.
 389          */
 390         ma_nameformat = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength;
 391         ma_namelength = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength + 1;
 392         ma_name = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength + 2;
 393
 394         ND_PRINT((ndo, "\n\t  MA Name-Format %s (%u), MA name length %u",
 395                tok2str(cfm_ma_nameformat_values, "Unknown",
 396                        *ma_nameformat),
 397                *ma_nameformat,
 398                *ma_namelength));
 399
 400         ND_PRINT((ndo, "\n\t  MA Name: "));
 401         switch (*ma_nameformat) {
 402         case CFM_CCM_MA_FORMAT_CHAR:
 403             safeputs(ndo, ma_name, *ma_namelength);
 404             break;
 405
 406             /* FIXME add printers for those MA formats - hexdump for now */
 407         case CFM_CCM_MA_FORMAT_8021:
 408         case CFM_CCM_MA_FORMAT_VID:
 409         case CFM_CCM_MA_FORMAT_INT:
 410         case CFM_CCM_MA_FORMAT_VPN:
 411         default:
 412             print_unknown_data(ndo, ma_name, "\n\t    ", *ma_namelength);
 413         }
 414         break;
 415
 416     case CFM_OPCODE_LTM:
 417         msg_ptr.cfm_ltm = (const struct cfm_ltm_t *)tptr;
 418
 419         ND_PRINT((ndo, ", Flags [%s]",
 420                bittok2str(cfm_ltm_flag_values, "none", cfm_common_header->flags)));
 421
 422         ND_PRINT((ndo, "\n\t  Transaction-ID 0x%08x, Egress-ID %s, ttl %u",
 423                EXTRACT_32BITS(msg_ptr.cfm_ltm->transaction_id),
 424                cfm_egress_id_string(ndo, msg_ptr.cfm_ltm->egress_id),
 425                msg_ptr.cfm_ltm->ttl));
 426
 427         ND_PRINT((ndo, "\n\t  Original-MAC %s, Target-MAC %s",
 428                etheraddr_string(ndo, msg_ptr.cfm_ltm->original_mac),
 429                etheraddr_string(ndo, msg_ptr.cfm_ltm->target_mac)));
 430         break;
 431
 432     case CFM_OPCODE_LTR:
 433         msg_ptr.cfm_ltr = (const struct cfm_ltr_t *)tptr;
 434
 435         ND_PRINT((ndo, ", Flags [%s]",
 436                bittok2str(cfm_ltr_flag_values, "none", cfm_common_header->flags)));
 437
 438         ND_PRINT((ndo, "\n\t  Transaction-ID 0x%08x, Last-Egress-ID %s",
 439                EXTRACT_32BITS(msg_ptr.cfm_ltr->transaction_id),
 440                cfm_egress_id_string(ndo, msg_ptr.cfm_ltr->last_egress_id)));
 441
 442         ND_PRINT((ndo, "\n\t  Next-Egress-ID %s, ttl %u",
 443                cfm_egress_id_string(ndo, msg_ptr.cfm_ltr->next_egress_id),
 444                msg_ptr.cfm_ltr->ttl));
 445
 446         ND_PRINT((ndo, "\n\t  Replay-Action %s (%u)",
 447                tok2str(cfm_ltr_replay_action_values,
 448                        "Unknown",
 449                        msg_ptr.cfm_ltr->replay_action),
 450                msg_ptr.cfm_ltr->replay_action));
 451         break;
 452
 453         /*
 454          * No message decoder yet.
 455          * Hexdump everything up until the start of the TLVs
 456          */
 457     case CFM_OPCODE_LBR:
 458     case CFM_OPCODE_LBM:
 459     default:
 460         if (tlen > cfm_common_header->first_tlv_offset) {
 461             print_unknown_data(ndo, tptr, "\n\t  ",
 462                                tlen -  cfm_common_header->first_tlv_offset);
 463         }
 464         break;
 465     }
 466
 467     /*
 468      * Sanity check for not walking off.
 469      */
 470     if (tlen <= cfm_common_header->first_tlv_offset) {
 471         return;
 472     }
 473
 474     tptr += cfm_common_header->first_tlv_offset;
 475     tlen -= cfm_common_header->first_tlv_offset;
 476
 477     while (tlen > 0) {
 478         cfm_tlv_header = (const struct cfm_tlv_header_t *)tptr;
 479
 480         /* Enough to read the tlv type ? */
 481         ND_TCHECK2(*tptr, 1);
 482         cfm_tlv_type=cfm_tlv_header->type;
 483
 484         if (cfm_tlv_type != CFM_TLV_END) {
 485             /* did we capture enough for fully decoding the object header ? */
 486             ND_TCHECK2(*tptr, sizeof(struct cfm_tlv_header_t));
 487             cfm_tlv_len=EXTRACT_16BITS(&cfm_tlv_header->length);
 488         } else {
 489             cfm_tlv_len = 0;
 490         }
 491
 492         ND_PRINT((ndo, "\n\t%s TLV (0x%02x), length %u",
 493                tok2str(cfm_tlv_values, "Unknown", cfm_tlv_type),
 494                cfm_tlv_type,
 495                cfm_tlv_len));
 496
 497         /* sanity check for not walking off and infinite loop check. */
 498         if ((cfm_tlv_type != CFM_TLV_END) &&
 499             ((cfm_tlv_len + sizeof(struct cfm_tlv_header_t) > tlen) ||
 500              (!cfm_tlv_len))) {
 501             print_unknown_data(ndo, tptr, "\n\t  ", tlen);
 502             return;
 503         }
 504
 505         tptr += sizeof(struct cfm_tlv_header_t);
 506         tlen -= sizeof(struct cfm_tlv_header_t);
 507         tlv_ptr = tptr;
 508
 509         /* did we capture enough for fully decoding the object ? */
 510         if (cfm_tlv_type != CFM_TLV_END) {
 511             ND_TCHECK2(*tptr, cfm_tlv_len);
 512         }
 513         hexdump = FALSE;
 514
 515         switch(cfm_tlv_type) {
 516         case CFM_TLV_END:
 517             /* we are done - bail out */
 518             return;
 519
 520         case CFM_TLV_PORT_STATUS:
 521             ND_PRINT((ndo, ", Status: %s (%u)",
 522                    tok2str(cfm_tlv_port_status_values, "Unknown", *tptr),
 523                    *tptr));
 524             break;
 525
 526         case CFM_TLV_INTERFACE_STATUS:
 527             ND_PRINT((ndo, ", Status: %s (%u)",
 528                    tok2str(cfm_tlv_interface_status_values, "Unknown", *tptr),
 529                    *tptr));
 530             break;
 531
 532         case CFM_TLV_PRIVATE:
 533             ND_PRINT((ndo, ", Vendor: %s (%u), Sub-Type %u",
 534                    tok2str(oui_values,"Unknown", EXTRACT_24BITS(tptr)),
 535                    EXTRACT_24BITS(tptr),
 536                    *(tptr + 3)));
 537             hexdump = TRUE;
 538             break;
 539
 540         case CFM_TLV_SENDER_ID:
 541         {
 542             u_int chassis_id_type, chassis_id_length;
 543             u_int mgmt_addr_length;
 544
 545             /*
 546              * Check if there is a Chassis-ID.
 547              */
 548             chassis_id_length = *tptr;
 549             if (chassis_id_length > tlen) {
 550                 hexdump = TRUE;
 551                 break;
 552             }
 553
 554             tptr++;
 555             tlen--;
 556
 557             if (chassis_id_length) {
 558                 chassis_id_type = *tptr;
 559                 ND_PRINT((ndo, "\n\t  Chassis-ID Type %s (%u), Chassis-ID length %u",
 560                        tok2str(cfm_tlv_senderid_chassisid_values,
 561                                "Unknown",
 562                                chassis_id_type),
 563                        chassis_id_type,
 564                        chassis_id_length));
 565
 566                 switch (chassis_id_type) {
 567                 case CFM_CHASSIS_ID_MAC_ADDRESS:
 568                     ND_PRINT((ndo, "\n\t  MAC %s", etheraddr_string(ndo, tptr + 1)));
 569                     break;
 570
 571                 case CFM_CHASSIS_ID_NETWORK_ADDRESS:
 572                     hexdump |= cfm_mgmt_addr_print(ndo, tptr);
 573                     break;
 574
 575                 case CFM_CHASSIS_ID_INTERFACE_NAME: /* fall through */
 576                 case CFM_CHASSIS_ID_INTERFACE_ALIAS:
 577                 case CFM_CHASSIS_ID_LOCAL:
 578                 case CFM_CHASSIS_ID_CHASSIS_COMPONENT:
 579                 case CFM_CHASSIS_ID_PORT_COMPONENT:
 580                     safeputs(ndo, tptr + 1, chassis_id_length);
 581                     break;
 582
 583                 default:
 584                     hexdump = TRUE;
 585                     break;
 586                 }
 587             }
 588
 589             tptr += chassis_id_length;
 590             tlen -= chassis_id_length;
 591
 592             /*
 593              * Check if there is a Management Address.
 594              */
 595             mgmt_addr_length = *tptr;
 596             if (mgmt_addr_length > tlen) {
 597                 hexdump = TRUE;
 598                 break;
 599             }
 600
 601             tptr++;
 602             tlen--;
 603
 604             if (mgmt_addr_length) {
 605                 hexdump |= cfm_mgmt_addr_print(ndo, tptr);
 606             }
 607
 608             tptr += mgmt_addr_length;
 609             tlen -= mgmt_addr_length;
 610
 611         }
 612         break;
 613
 614             /*
 615              * FIXME those are the defined TLVs that lack a decoder
 616              * you are welcome to contribute code ;-)
 617              */
 618
 619         case CFM_TLV_DATA:
 620         case CFM_TLV_REPLY_INGRESS:
 621         case CFM_TLV_REPLY_EGRESS:
 622         default:
 623             hexdump = TRUE;
 624             break;
 625         }
 626         /* do we want to see an additional hexdump ? */
 627         if (hexdump || ndo->ndo_vflag > 1)
 628             print_unknown_data(ndo, tlv_ptr, "\n\t  ", cfm_tlv_len);
 629
 630         tptr+=cfm_tlv_len;
 631         tlen-=cfm_tlv_len;
 632     }
 633     return;
 634 trunc:
 635     ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
 636 }