contrib/tcpdump/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 #define NETDISSECT_REWORKED
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25 #include <tcpdump-stdinc.h>
  26
  27 #include <stdio.h>
  28
  29 #include "interface.h"
  30 #include "extract.h"
  31 #include "ether.h"
  32 #include "addrtoname.h"
  33 #include "oui.h"
  34 #include "af.h"
  35
  36 struct cfm_common_header_t {
  37     uint8_t mdlevel_version;
  38     uint8_t opcode;
  39     uint8_t flags;
  40     uint8_t first_tlv_offset;
  41 };
  42
  43 #define CFM_VERSION 0
  44 #define CFM_EXTRACT_VERSION(x) (((x)&0x1f))
  45 #define CFM_EXTRACT_MD_LEVEL(x) (((x)&0xe0)>>5)
  46
  47 #define CFM_OPCODE_CCM 1
  48 #define CFM_OPCODE_LBR 2
  49 #define CFM_OPCODE_LBM 3
  50 #define CFM_OPCODE_LTR 4
  51 #define CFM_OPCODE_LTM 5
  52
  53 static const struct tok cfm_opcode_values[] = {
  54     { CFM_OPCODE_CCM, "Continouity Check Message"},
  55     { CFM_OPCODE_LBR, "Loopback Reply"},
  56     { CFM_OPCODE_LBM, "Loopback Message"},
  57     { CFM_OPCODE_LTR, "Linktrace Reply"},
  58     { CFM_OPCODE_LTM, "Linktrace Message"},
  59     { 0, NULL}
  60 };
  61
  62 /*
  63  * Message Formats.
  64  */
  65 struct cfm_ccm_t {
  66     uint8_t sequence[4];
  67     uint8_t ma_epi[2];
  68     uint8_t md_nameformat;
  69     uint8_t md_namelength;
  70     uint8_t md_name[46]; /* md name and short ma name */
  71     uint8_t reserved_itu[16];
  72     uint8_t reserved[6];
  73 };
  74
  75 /*
  76  * Timer Bases for the CCM Interval field.
  77  * Expressed in units of seconds.
  78  */
  79 const float ccm_interval_base[8] = {0, 0.003333, 0.01, 0.1, 1, 10, 60, 600};
  80 #define CCM_INTERVAL_MIN_MULTIPLIER 3.25
  81 #define CCM_INTERVAL_MAX_MULTIPLIER 3.5
  82
  83 #define CFM_CCM_RDI_FLAG 0x80
  84 #define CFM_EXTRACT_CCM_INTERVAL(x) (((x)&0x07))
  85
  86 #define CFM_CCM_MD_FORMAT_8021 0
  87 #define CFM_CCM_MD_FORMAT_NONE 1
  88 #define CFM_CCM_MD_FORMAT_DNS  2
  89 #define CFM_CCM_MD_FORMAT_MAC  3
  90 #define CFM_CCM_MD_FORMAT_CHAR 4
  91
  92 static const struct tok cfm_md_nameformat_values[] = {
  93     { CFM_CCM_MD_FORMAT_8021, "IEEE 802.1"},
  94     { CFM_CCM_MD_FORMAT_NONE, "No MD Name present"},
  95     { CFM_CCM_MD_FORMAT_DNS, "DNS string"},
  96     { CFM_CCM_MD_FORMAT_MAC, "MAC + 16Bit Integer"},
  97     { CFM_CCM_MD_FORMAT_CHAR, "Character string"},
  98     { 0, NULL}
  99 };
 100
 101 #define CFM_CCM_MA_FORMAT_8021 0
 102 #define CFM_CCM_MA_FORMAT_VID  1
 103 #define CFM_CCM_MA_FORMAT_CHAR 2
 104 #define CFM_CCM_MA_FORMAT_INT  3
 105 #define CFM_CCM_MA_FORMAT_VPN  4
 106
 107 static const struct tok cfm_ma_nameformat_values[] = {
 108     { CFM_CCM_MA_FORMAT_8021, "IEEE 802.1"},
 109     { CFM_CCM_MA_FORMAT_VID, "Primary VID"},
 110     { CFM_CCM_MA_FORMAT_CHAR, "Character string"},
 111     { CFM_CCM_MA_FORMAT_INT, "16Bit Integer"},
 112     { CFM_CCM_MA_FORMAT_VPN, "RFC2685 VPN-ID"},
 113     { 0, NULL}
 114 };
 115
 116 struct cfm_lbm_t {
 117     uint8_t transaction_id[4];
 118     uint8_t reserved[4];
 119 };
 120
 121 struct cfm_ltm_t {
 122     uint8_t transaction_id[4];
 123     uint8_t egress_id[8];
 124     uint8_t ttl;
 125     uint8_t original_mac[ETHER_ADDR_LEN];
 126     uint8_t target_mac[ETHER_ADDR_LEN];
 127     uint8_t reserved[3];
 128 };
 129
 130 static const struct tok cfm_ltm_flag_values[] = {
 131     { 0x80, "Use Forwarding-DB only"},
 132     { 0, NULL}
 133 };
 134
 135 struct cfm_ltr_t {
 136     uint8_t transaction_id[4];
 137     uint8_t last_egress_id[8];
 138     uint8_t next_egress_id[8];
 139     uint8_t ttl;
 140     uint8_t replay_action;
 141     uint8_t reserved[6];
 142 };
 143
 144 static const struct tok cfm_ltr_flag_values[] = {
 145     { 0x80, "UseFDB Only"},
 146     { 0x40, "FwdYes"},
 147     { 0x20, "Terminal MEP"},
 148     { 0, NULL}
 149 };
 150
 151 static const struct tok cfm_ltr_replay_action_values[] = {
 152     { 1, "Exact Match"},
 153     { 2, "Filtering DB"},
 154     { 3, "MIP CCM DB"},
 155     { 0, NULL}
 156 };
 157
 158
 159 #define CFM_TLV_END 0
 160 #define CFM_TLV_SENDER_ID 1
 161 #define CFM_TLV_PORT_STATUS 2
 162 #define CFM_TLV_INTERFACE_STATUS 3
 163 #define CFM_TLV_DATA 4
 164 #define CFM_TLV_REPLY_INGRESS 5
 165 #define CFM_TLV_REPLY_EGRESS 6
 166 #define CFM_TLV_PRIVATE 31
 167
 168 static const struct tok cfm_tlv_values[] = {
 169     { CFM_TLV_END, "End"},
 170     { CFM_TLV_SENDER_ID, "Sender ID"},
 171     { CFM_TLV_PORT_STATUS, "Port status"},
 172     { CFM_TLV_INTERFACE_STATUS, "Interface status"},
 173     { CFM_TLV_DATA, "Data"},
 174     { CFM_TLV_REPLY_INGRESS, "Reply Ingress"},
 175     { CFM_TLV_REPLY_EGRESS, "Reply Egress"},
 176     { CFM_TLV_PRIVATE, "Organization Specific"},
 177     { 0, NULL}
 178 };
 179
 180 /*
 181  * TLVs
 182  */
 183
 184 struct cfm_tlv_header_t {
 185     uint8_t type;
 186     uint8_t length[2];
 187 };
 188
 189 /* FIXME define TLV formats */
 190
 191 static const struct tok cfm_tlv_port_status_values[] = {
 192     { 1, "Blocked"},
 193     { 2, "Up"},
 194     { 0, NULL}
 195 };
 196
 197 static const struct tok cfm_tlv_interface_status_values[] = {
 198     { 1, "Up"},
 199     { 2, "Down"},
 200     { 3, "Testing"},
 201     { 5, "Dormant"},
 202     { 6, "not present"},
 203     { 7, "lower Layer down"},
 204     { 0, NULL}
 205 };
 206
 207 #define CFM_CHASSIS_ID_CHASSIS_COMPONENT 1
 208 #define CFM_CHASSIS_ID_INTERFACE_ALIAS 2
 209 #define CFM_CHASSIS_ID_PORT_COMPONENT 3
 210 #define CFM_CHASSIS_ID_MAC_ADDRESS 4
 211 #define CFM_CHASSIS_ID_NETWORK_ADDRESS 5
 212 #define CFM_CHASSIS_ID_INTERFACE_NAME 6
 213 #define CFM_CHASSIS_ID_LOCAL 7
 214
 215 static const struct tok cfm_tlv_senderid_chassisid_values[] = {
 216     { 0, "Reserved"},
 217     { CFM_CHASSIS_ID_CHASSIS_COMPONENT, "Chassis component"},
 218     { CFM_CHASSIS_ID_INTERFACE_ALIAS, "Interface alias"},
 219     { CFM_CHASSIS_ID_PORT_COMPONENT, "Port component"},
 220     { CFM_CHASSIS_ID_MAC_ADDRESS, "MAC address"},
 221     { CFM_CHASSIS_ID_NETWORK_ADDRESS, "Network address"},
 222     { CFM_CHASSIS_ID_INTERFACE_NAME, "Interface name"},
 223     { CFM_CHASSIS_ID_LOCAL, "Locally assigned"},
 224     { 0, NULL}
 225 };
 226
 227
 228 static int
 229 cfm_mgmt_addr_print(netdissect_options *ndo,
 230                     register const u_char *tptr)
 231 {
 232     u_int mgmt_addr_type;
 233     u_int hexdump =  FALSE;
 234
 235     /*
 236      * Altough AFIs are tpically 2 octects wide,
 237      * 802.1ab specifies that this field width
 238      * is only once octet
 239      */
 240     mgmt_addr_type = *tptr;
 241     ND_PRINT((ndo, "\n\t  Management Address Type %s (%u)",
 242            tok2str(af_values, "Unknown", mgmt_addr_type),
 243            mgmt_addr_type));
 244
 245     /*
 246      * Resolve the passed in Address.
 247      */
 248     switch(mgmt_addr_type) {
 249     case AFNUM_INET:
 250         ND_PRINT((ndo, ", %s", ipaddr_string(ndo, tptr + 1)));
 251         break;
 252
 253 #ifdef INET6
 254     case AFNUM_INET6:
 255         ND_PRINT((ndo, ", %s", ip6addr_string(ndo, tptr + 1)));
 256         break;
 257 #endif
 258
 259     default:
 260         hexdump = TRUE;
 261         break;
 262     }
 263
 264     return hexdump;
 265 }
 266
 267 /*
 268  * The egress-ID string is a 16-Bit string plus a MAC address.
 269  */
 270 static const char *
 271 cfm_egress_id_string(netdissect_options *ndo, register const u_char *tptr)
 272 {
 273     static char egress_id_buffer[80];
 274
 275     snprintf(egress_id_buffer, sizeof(egress_id_buffer),
 276              "MAC 0x%4x-%s",
 277              EXTRACT_16BITS(tptr),
 278              etheraddr_string(ndo, tptr+2));
 279
 280     return egress_id_buffer;
 281 }
 282
 283 void
 284 cfm_print(netdissect_options *ndo,
 285           register const u_char *pptr, register u_int length)
 286 {
 287     const struct cfm_common_header_t *cfm_common_header;
 288     const struct cfm_tlv_header_t *cfm_tlv_header;
 289     const uint8_t *tptr, *tlv_ptr, *ma_name, *ma_nameformat, *ma_namelength;
 290     u_int hexdump, tlen, cfm_tlv_len, cfm_tlv_type, ccm_interval;
 291
 292
 293     union {
 294         const struct cfm_ccm_t *cfm_ccm;
 295         const struct cfm_lbm_t *cfm_lbm;
 296         const struct cfm_ltm_t *cfm_ltm;
 297         const struct cfm_ltr_t *cfm_ltr;
 298     } msg_ptr;
 299
 300     tptr=pptr;
 301     cfm_common_header = (const struct cfm_common_header_t *)pptr;
 302     ND_TCHECK(*cfm_common_header);
 303
 304     /*
 305      * Sanity checking of the header.
 306      */
 307     if (CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version) != CFM_VERSION) {
 308         ND_PRINT((ndo, "CFMv%u not supported, length %u",
 309                CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version), length));
 310         return;
 311     }
 312
 313     ND_PRINT((ndo, "CFMv%u %s, MD Level %u, length %u",
 314            CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version),
 315            tok2str(cfm_opcode_values, "unknown (%u)", cfm_common_header->opcode),
 316            CFM_EXTRACT_MD_LEVEL(cfm_common_header->mdlevel_version),
 317            length));
 318
 319     /*
 320      * In non-verbose mode just print the opcode and md-level.
 321      */
 322     if (ndo->ndo_vflag < 1) {
 323         return;
 324     }
 325
 326     ND_PRINT((ndo, "\n\tFirst TLV offset %u", cfm_common_header->first_tlv_offset));
 327
 328     tptr += sizeof(const struct cfm_common_header_t);
 329     tlen = length - sizeof(struct cfm_common_header_t);
 330
 331     switch (cfm_common_header->opcode) {
 332     case CFM_OPCODE_CCM:
 333         msg_ptr.cfm_ccm = (const struct cfm_ccm_t *)tptr;
 334
 335         ccm_interval = CFM_EXTRACT_CCM_INTERVAL(cfm_common_header->flags);
 336         ND_PRINT((ndo, ", Flags [CCM Interval %u%s]",
 337                ccm_interval,
 338                cfm_common_header->flags & CFM_CCM_RDI_FLAG ?
 339                ", RDI" : ""));
 340
 341         /*
 342          * Resolve the CCM interval field.
 343          */
 344         if (ccm_interval) {
 345             ND_PRINT((ndo, "\n\t  CCM Interval %.3fs"
 346                    ", min CCM Lifetime %.3fs, max CCM Lifetime %.3fs",
 347                    ccm_interval_base[ccm_interval],
 348                    ccm_interval_base[ccm_interval] * CCM_INTERVAL_MIN_MULTIPLIER,
 349                    ccm_interval_base[ccm_interval] * CCM_INTERVAL_MAX_MULTIPLIER));
 350         }
 351
 352         ND_PRINT((ndo, "\n\t  Sequence Number 0x%08x, MA-End-Point-ID 0x%04x",
 353                EXTRACT_32BITS(msg_ptr.cfm_ccm->sequence),
 354                EXTRACT_16BITS(msg_ptr.cfm_ccm->ma_epi)));
 355
 356
 357         /*
 358          * Resolve the MD fields.
 359          */
 360         ND_PRINT((ndo, "\n\t  MD Name Format %s (%u), MD Name length %u",
 361                tok2str(cfm_md_nameformat_values, "Unknown",
 362                        msg_ptr.cfm_ccm->md_nameformat),
 363                msg_ptr.cfm_ccm->md_nameformat,
 364                msg_ptr.cfm_ccm->md_namelength));
 365
 366         if (msg_ptr.cfm_ccm->md_nameformat != CFM_CCM_MD_FORMAT_NONE) {
 367             ND_PRINT((ndo, "\n\t  MD Name: "));
 368             switch (msg_ptr.cfm_ccm->md_nameformat) {
 369             case CFM_CCM_MD_FORMAT_DNS:
 370             case CFM_CCM_MD_FORMAT_CHAR:
 371                 safeputs(ndo, msg_ptr.cfm_ccm->md_name, msg_ptr.cfm_ccm->md_namelength);
 372                 break;
 373
 374             case CFM_CCM_MD_FORMAT_MAC:
 375                 ND_PRINT((ndo, "\n\t  MAC %s", etheraddr_string(ndo,
 376                            msg_ptr.cfm_ccm->md_name)));
 377                 break;
 378
 379                 /* FIXME add printers for those MD formats - hexdump for now */
 380             case CFM_CCM_MA_FORMAT_8021:
 381             default:
 382                 print_unknown_data(ndo, msg_ptr.cfm_ccm->md_name, "\n\t    ",
 383                                    msg_ptr.cfm_ccm->md_namelength);
 384             }
 385         }
 386
 387
 388         /*
 389          * Resolve the MA fields.
 390          */
 391         ma_nameformat = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength;
 392         ma_namelength = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength + 1;
 393         ma_name = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength + 2;
 394
 395         ND_PRINT((ndo, "\n\t  MA Name-Format %s (%u), MA name length %u",
 396                tok2str(cfm_ma_nameformat_values, "Unknown",
 397                        *ma_nameformat),
 398                *ma_nameformat,
 399                *ma_namelength));
 400
 401         ND_PRINT((ndo, "\n\t  MA Name: "));
 402         switch (*ma_nameformat) {
 403         case CFM_CCM_MA_FORMAT_CHAR:
 404             safeputs(ndo, ma_name, *ma_namelength);
 405             break;
 406
 407             /* FIXME add printers for those MA formats - hexdump for now */
 408         case CFM_CCM_MA_FORMAT_8021:
 409         case CFM_CCM_MA_FORMAT_VID:
 410         case CFM_CCM_MA_FORMAT_INT:
 411         case CFM_CCM_MA_FORMAT_VPN:
 412         default:
 413             print_unknown_data(ndo, ma_name, "\n\t    ", *ma_namelength);
 414         }
 415         break;
 416
 417     case CFM_OPCODE_LTM:
 418         msg_ptr.cfm_ltm = (const struct cfm_ltm_t *)tptr;
 419
 420         ND_PRINT((ndo, ", Flags [%s]",
 421                bittok2str(cfm_ltm_flag_values, "none", cfm_common_header->flags)));
 422
 423         ND_PRINT((ndo, "\n\t  Transaction-ID 0x%08x, Egress-ID %s, ttl %u",
 424                EXTRACT_32BITS(msg_ptr.cfm_ltm->transaction_id),
 425                cfm_egress_id_string(ndo, msg_ptr.cfm_ltm->egress_id),
 426                msg_ptr.cfm_ltm->ttl));
 427
 428         ND_PRINT((ndo, "\n\t  Original-MAC %s, Target-MAC %s",
 429                etheraddr_string(ndo, msg_ptr.cfm_ltm->original_mac),
 430                etheraddr_string(ndo, msg_ptr.cfm_ltm->target_mac)));
 431         break;
 432
 433     case CFM_OPCODE_LTR:
 434         msg_ptr.cfm_ltr = (const struct cfm_ltr_t *)tptr;
 435
 436         ND_PRINT((ndo, ", Flags [%s]",
 437                bittok2str(cfm_ltr_flag_values, "none", cfm_common_header->flags)));
 438
 439         ND_PRINT((ndo, "\n\t  Transaction-ID 0x%08x, Last-Egress-ID %s",
 440                EXTRACT_32BITS(msg_ptr.cfm_ltr->transaction_id),
 441                cfm_egress_id_string(ndo, msg_ptr.cfm_ltr->last_egress_id)));
 442
 443         ND_PRINT((ndo, "\n\t  Next-Egress-ID %s, ttl %u",
 444                cfm_egress_id_string(ndo, msg_ptr.cfm_ltr->next_egress_id),
 445                msg_ptr.cfm_ltr->ttl));
 446
 447         ND_PRINT((ndo, "\n\t  Replay-Action %s (%u)",
 448                tok2str(cfm_ltr_replay_action_values,
 449                        "Unknown",
 450                        msg_ptr.cfm_ltr->replay_action),
 451                msg_ptr.cfm_ltr->replay_action));
 452         break;
 453
 454         /*
 455          * No message decoder yet.
 456          * Hexdump everything up until the start of the TLVs
 457          */
 458     case CFM_OPCODE_LBR:
 459     case CFM_OPCODE_LBM:
 460     default:
 461         if (tlen > cfm_common_header->first_tlv_offset) {
 462             print_unknown_data(ndo, tptr, "\n\t  ",
 463                                tlen -  cfm_common_header->first_tlv_offset);
 464         }
 465         break;
 466     }
 467
 468     /*
 469      * Sanity check for not walking off.
 470      */
 471     if (tlen <= cfm_common_header->first_tlv_offset) {
 472         return;
 473     }
 474
 475     tptr += cfm_common_header->first_tlv_offset;
 476     tlen -= cfm_common_header->first_tlv_offset;
 477
 478     while (tlen > 0) {
 479         cfm_tlv_header = (const struct cfm_tlv_header_t *)tptr;
 480
 481         /* Enough to read the tlv type ? */
 482         ND_TCHECK2(*tptr, 1);
 483         cfm_tlv_type=cfm_tlv_header->type;
 484
 485         if (cfm_tlv_type != CFM_TLV_END) {
 486             /* did we capture enough for fully decoding the object header ? */
 487             ND_TCHECK2(*tptr, sizeof(struct cfm_tlv_header_t));
 488             cfm_tlv_len=EXTRACT_16BITS(&cfm_tlv_header->length);
 489         } else {
 490             cfm_tlv_len = 0;
 491         }
 492
 493         ND_PRINT((ndo, "\n\t%s TLV (0x%02x), length %u",
 494                tok2str(cfm_tlv_values, "Unknown", cfm_tlv_type),
 495                cfm_tlv_type,
 496                cfm_tlv_len));
 497
 498         /* sanity check for not walking off and infinite loop check. */
 499         if ((cfm_tlv_type != CFM_TLV_END) &&
 500             ((cfm_tlv_len + sizeof(struct cfm_tlv_header_t) > tlen) ||
 501              (!cfm_tlv_len))) {
 502             print_unknown_data(ndo, tptr, "\n\t  ", tlen);
 503             return;
 504         }
 505
 506         tptr += sizeof(struct cfm_tlv_header_t);
 507         tlen -= sizeof(struct cfm_tlv_header_t);
 508         tlv_ptr = tptr;
 509
 510         /* did we capture enough for fully decoding the object ? */
 511         if (cfm_tlv_type != CFM_TLV_END) {
 512             ND_TCHECK2(*tptr, cfm_tlv_len);
 513         }
 514         hexdump = FALSE;
 515
 516         switch(cfm_tlv_type) {
 517         case CFM_TLV_END:
 518             /* we are done - bail out */
 519             return;
 520
 521         case CFM_TLV_PORT_STATUS:
 522             ND_PRINT((ndo, ", Status: %s (%u)",
 523                    tok2str(cfm_tlv_port_status_values, "Unknown", *tptr),
 524                    *tptr));
 525             break;
 526
 527         case CFM_TLV_INTERFACE_STATUS:
 528             ND_PRINT((ndo, ", Status: %s (%u)",
 529                    tok2str(cfm_tlv_interface_status_values, "Unknown", *tptr),
 530                    *tptr));
 531             break;
 532
 533         case CFM_TLV_PRIVATE:
 534             ND_PRINT((ndo, ", Vendor: %s (%u), Sub-Type %u",
 535                    tok2str(oui_values,"Unknown", EXTRACT_24BITS(tptr)),
 536                    EXTRACT_24BITS(tptr),
 537                    *(tptr + 3)));
 538             hexdump = TRUE;
 539             break;
 540
 541         case CFM_TLV_SENDER_ID:
 542         {
 543             u_int chassis_id_type, chassis_id_length;
 544             u_int mgmt_addr_length;
 545
 546             /*
 547              * Check if there is a Chassis-ID.
 548              */
 549             chassis_id_length = *tptr;
 550             if (chassis_id_length > tlen) {
 551                 hexdump = TRUE;
 552                 break;
 553             }
 554
 555             tptr++;
 556             tlen--;
 557
 558             if (chassis_id_length) {
 559                 chassis_id_type = *tptr;
 560                 ND_PRINT((ndo, "\n\t  Chassis-ID Type %s (%u), Chassis-ID length %u",
 561                        tok2str(cfm_tlv_senderid_chassisid_values,
 562                                "Unknown",
 563                                chassis_id_type),
 564                        chassis_id_type,
 565                        chassis_id_length));
 566
 567                 switch (chassis_id_type) {
 568                 case CFM_CHASSIS_ID_MAC_ADDRESS:
 569                     ND_PRINT((ndo, "\n\t  MAC %s", etheraddr_string(ndo, tptr + 1)));
 570                     break;
 571
 572                 case CFM_CHASSIS_ID_NETWORK_ADDRESS:
 573                     hexdump |= cfm_mgmt_addr_print(ndo, tptr);
 574                     break;
 575
 576                 case CFM_CHASSIS_ID_INTERFACE_NAME: /* fall through */
 577                 case CFM_CHASSIS_ID_INTERFACE_ALIAS:
 578                 case CFM_CHASSIS_ID_LOCAL:
 579                 case CFM_CHASSIS_ID_CHASSIS_COMPONENT:
 580                 case CFM_CHASSIS_ID_PORT_COMPONENT:
 581                     safeputs(ndo, tptr + 1, chassis_id_length);
 582                     break;
 583
 584                 default:
 585                     hexdump = TRUE;
 586                     break;
 587                 }
 588             }
 589
 590             tptr += chassis_id_length;
 591             tlen -= chassis_id_length;
 592
 593             /*
 594              * Check if there is a Management Address.
 595              */
 596             mgmt_addr_length = *tptr;
 597             if (mgmt_addr_length > tlen) {
 598                 hexdump = TRUE;
 599                 break;
 600             }
 601
 602             tptr++;
 603             tlen--;
 604
 605             if (mgmt_addr_length) {
 606                 hexdump |= cfm_mgmt_addr_print(ndo, tptr);
 607             }
 608
 609             tptr += mgmt_addr_length;
 610             tlen -= mgmt_addr_length;
 611
 612         }
 613         break;
 614
 615             /*
 616              * FIXME those are the defined TLVs that lack a decoder
 617              * you are welcome to contribute code ;-)
 618              */
 619
 620         case CFM_TLV_DATA:
 621         case CFM_TLV_REPLY_INGRESS:
 622         case CFM_TLV_REPLY_EGRESS:
 623         default:
 624             hexdump = TRUE;
 625             break;
 626         }
 627         /* do we want to see an additional hexdump ? */
 628         if (hexdump || ndo->ndo_vflag > 1)
 629             print_unknown_data(ndo, tlv_ptr, "\n\t  ", cfm_tlv_len);
 630
 631         tptr+=cfm_tlv_len;
 632         tlen-=cfm_tlv_len;
 633     }
 634     return;
 635 trunc:
 636     ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
 637 }