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 #ifndef lint
  21 static const char rcsid[] _U_ =
  22     "@(#) $Header: /tcpdump/master/tcpdump/print-cfm.c,v 1.5 2007-07-24 16:01:42 hannes Exp $";
  23 #endif
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include <tcpdump-stdinc.h>
  30
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34
  35 #include "interface.h"
  36 #include "extract.h"
  37 #include "ether.h"
  38 #include "addrtoname.h"
  39 #include "oui.h"
  40 #include "af.h"
  41
  42 /*
  43  * Prototypes
  44  */
  45 const char * cfm_egress_id_string(register const u_char *);
  46 int cfm_mgmt_addr_print(register const u_char *);
  47
  48 struct cfm_common_header_t {
  49     u_int8_t mdlevel_version;
  50     u_int8_t opcode;
  51     u_int8_t flags;
  52     u_int8_t first_tlv_offset;
  53 };
  54
  55 #define CFM_VERSION 0
  56 #define CFM_EXTRACT_VERSION(x) (((x)&0x1f))
  57 #define CFM_EXTRACT_MD_LEVEL(x) (((x)&0xe0)>>5)
  58
  59 #define CFM_OPCODE_CCM 1
  60 #define CFM_OPCODE_LBR 2
  61 #define CFM_OPCODE_LBM 3
  62 #define CFM_OPCODE_LTR 4
  63 #define CFM_OPCODE_LTM 5
  64
  65 static const struct tok cfm_opcode_values[] = {
  66     { CFM_OPCODE_CCM, "Continouity Check Message"},
  67     { CFM_OPCODE_LBR, "Loopback Reply"},
  68     { CFM_OPCODE_LBM, "Loopback Message"},
  69     { CFM_OPCODE_LTR, "Linktrace Reply"},
  70     { CFM_OPCODE_LTM, "Linktrace Message"},
  71     { 0, NULL}
  72 };
  73
  74 /*
  75  * Message Formats.
  76  */
  77 struct cfm_ccm_t {
  78     u_int8_t sequence[4];
  79     u_int8_t ma_epi[2];
  80     u_int8_t md_nameformat;
  81     u_int8_t md_namelength;
  82     u_int8_t md_name[46]; /* md name and short ma name */
  83     u_int8_t reserved_itu[16];
  84     u_int8_t reserved[6];
  85 };
  86
  87 /*
  88  * Timer Bases for the CCM Interval field.
  89  * Expressed in units of seconds.
  90  */
  91 const float ccm_interval_base[8] = {0, 0.003333, 0.01, 0.1, 1, 10, 60, 600};
  92 #define CCM_INTERVAL_MIN_MULTIPLIER 3.25
  93 #define CCM_INTERVAL_MAX_MULTIPLIER 3.5
  94
  95 #define CFM_CCM_RDI_FLAG 0x80
  96 #define CFM_EXTRACT_CCM_INTERVAL(x) (((x)&0x07))
  97
  98 #define CFM_CCM_MD_FORMAT_8021 0
  99 #define CFM_CCM_MD_FORMAT_NONE 1
 100 #define CFM_CCM_MD_FORMAT_DNS  2
 101 #define CFM_CCM_MD_FORMAT_MAC  3
 102 #define CFM_CCM_MD_FORMAT_CHAR 4
 103
 104 static const struct tok cfm_md_nameformat_values[] = {
 105     { CFM_CCM_MD_FORMAT_8021, "IEEE 802.1"},
 106     { CFM_CCM_MD_FORMAT_NONE, "No MD Name present"},
 107     { CFM_CCM_MD_FORMAT_DNS, "DNS string"},
 108     { CFM_CCM_MD_FORMAT_MAC, "MAC + 16Bit Integer"},
 109     { CFM_CCM_MD_FORMAT_CHAR, "Character string"},
 110     { 0, NULL}
 111 };
 112
 113 #define CFM_CCM_MA_FORMAT_8021 0
 114 #define CFM_CCM_MA_FORMAT_VID  1
 115 #define CFM_CCM_MA_FORMAT_CHAR 2
 116 #define CFM_CCM_MA_FORMAT_INT  3
 117 #define CFM_CCM_MA_FORMAT_VPN  4
 118
 119 static const struct tok cfm_ma_nameformat_values[] = {
 120     { CFM_CCM_MA_FORMAT_8021, "IEEE 802.1"},
 121     { CFM_CCM_MA_FORMAT_VID, "Primary VID"},
 122     { CFM_CCM_MA_FORMAT_CHAR, "Character string"},
 123     { CFM_CCM_MA_FORMAT_INT, "16Bit Integer"},
 124     { CFM_CCM_MA_FORMAT_VPN, "RFC2685 VPN-ID"},
 125     { 0, NULL}
 126 };
 127
 128 struct cfm_lbm_t {
 129     u_int8_t transaction_id[4];
 130     u_int8_t reserved[4];
 131 };
 132
 133 struct cfm_ltm_t {
 134     u_int8_t transaction_id[4];
 135     u_int8_t egress_id[8];
 136     u_int8_t ttl;
 137     u_int8_t original_mac[ETHER_ADDR_LEN];
 138     u_int8_t target_mac[ETHER_ADDR_LEN];
 139     u_int8_t reserved[3];
 140 };
 141
 142 static const struct tok cfm_ltm_flag_values[] = {
 143     { 0x80, "Use Forwarding-DB only"},
 144     { 0, NULL}
 145 };
 146
 147 struct cfm_ltr_t {
 148     u_int8_t transaction_id[4];
 149     u_int8_t last_egress_id[8];
 150     u_int8_t next_egress_id[8];
 151     u_int8_t ttl;
 152     u_int8_t replay_action;
 153     u_int8_t reserved[6];
 154 };
 155
 156 static const struct tok cfm_ltr_flag_values[] = {
 157     { 0x80, "Forwarded"},
 158     { 0x40, "Terminal MEP"},
 159     { 0, NULL}
 160 };
 161
 162 static const struct tok cfm_ltr_replay_action_values[] = {
 163     { 1, "Exact Match"},
 164     { 2, "Filtering DB"},
 165     { 3, "MIP CCM DB"},
 166     { 0, NULL}
 167 };
 168
 169
 170 #define CFM_TLV_END 0
 171 #define CFM_TLV_SENDER_ID 1
 172 #define CFM_TLV_PORT_STATUS 2
 173 #define CFM_TLV_INTERFACE_STATUS 3
 174 #define CFM_TLV_DATA 4
 175 #define CFM_TLV_REPLY_INGRESS 5
 176 #define CFM_TLV_REPLY_EGRESS 6
 177 #define CFM_TLV_PRIVATE 31
 178
 179 static const struct tok cfm_tlv_values[] = {
 180     { CFM_TLV_END, "End"},
 181     { CFM_TLV_SENDER_ID, "Sender ID"},
 182     { CFM_TLV_PORT_STATUS, "Port status"},
 183     { CFM_TLV_INTERFACE_STATUS, "Interface status"},
 184     { CFM_TLV_DATA, "Data"},
 185     { CFM_TLV_REPLY_INGRESS, "Reply Ingress"},
 186     { CFM_TLV_REPLY_EGRESS, "Reply Egress"},
 187     { CFM_TLV_PRIVATE, "Organization Specific"},
 188     { 0, NULL}
 189 };
 190
 191 /*
 192  * TLVs
 193  */
 194
 195 struct cfm_tlv_header_t {
 196     u_int8_t type;
 197     u_int8_t length[2];
 198 };
 199
 200 /* FIXME define TLV formats */
 201
 202 static const struct tok cfm_tlv_port_status_values[] = {
 203     { 1, "Blocked"},
 204     { 2, "Up"},
 205     { 0, NULL}
 206 };
 207
 208 static const struct tok cfm_tlv_interface_status_values[] = {
 209     { 1, "Up"},
 210     { 2, "Down"},
 211     { 3, "Testing"},
 212     { 5, "Dormant"},
 213     { 6, "not present"},
 214     { 7, "lower Layer down"},
 215     { 0, NULL}
 216 };
 217
 218 #define CFM_CHASSIS_ID_CHASSIS_COMPONENT 1
 219 #define CFM_CHASSIS_ID_INTERFACE_ALIAS 2
 220 #define CFM_CHASSIS_ID_PORT_COMPONENT 3
 221 #define CFM_CHASSIS_ID_MAC_ADDRESS 4
 222 #define CFM_CHASSIS_ID_NETWORK_ADDRESS 5
 223 #define CFM_CHASSIS_ID_INTERFACE_NAME 6
 224 #define CFM_CHASSIS_ID_LOCAL 7
 225
 226 static const struct tok cfm_tlv_senderid_chassisid_values[] = {
 227     { 0, "Reserved"},
 228     { CFM_CHASSIS_ID_CHASSIS_COMPONENT, "Chassis component"},
 229     { CFM_CHASSIS_ID_INTERFACE_ALIAS, "Interface alias"},
 230     { CFM_CHASSIS_ID_PORT_COMPONENT, "Port component"},
 231     { CFM_CHASSIS_ID_MAC_ADDRESS, "MAC address"},
 232     { CFM_CHASSIS_ID_NETWORK_ADDRESS, "Network address"},
 233     { CFM_CHASSIS_ID_INTERFACE_NAME, "Interface name"},
 234     { CFM_CHASSIS_ID_LOCAL, "Locally assigned"},
 235     { 0, NULL}
 236 };
 237
 238
 239 int
 240 cfm_mgmt_addr_print(register const u_char *tptr) {
 241
 242     u_int mgmt_addr_type;
 243     u_int hexdump =  FALSE;
 244
 245     /*
 246      * Altough AFIs are tpically 2 octects wide,
 247      * 802.1ab specifies that this field width
 248      * is only once octet
 249      */
 250     mgmt_addr_type = *tptr;
 251     printf("\n\t  Management Address Type %s (%u)",
 252            tok2str(af_values, "Unknown", mgmt_addr_type),
 253            mgmt_addr_type);
 254
 255     /*
 256      * Resolve the passed in Address.
 257      */
 258     switch(mgmt_addr_type) {
 259     case AFNUM_INET:
 260         printf(", %s", ipaddr_string(tptr + 1));
 261         break;
 262
 263 #ifdef INET6
 264     case AFNUM_INET6:
 265         printf(", %s", ip6addr_string(tptr + 1));
 266         break;
 267 #endif
 268
 269     default:
 270         hexdump = TRUE;
 271         break;
 272     }
 273
 274     return hexdump;
 275 }
 276
 277 /*
 278  * The egress-ID string is a 16-Bit string plus a MAC address.
 279  */
 280 const char *
 281 cfm_egress_id_string(register const u_char *tptr) {
 282     static char egress_id_buffer[80];
 283
 284     snprintf(egress_id_buffer, sizeof(egress_id_buffer),
 285              "MAC %0x4x-%s",
 286              EXTRACT_16BITS(tptr),
 287              etheraddr_string(tptr+2));
 288
 289     return egress_id_buffer;
 290 }
 291
 292 void
 293 cfm_print(register const u_char *pptr, register u_int length) {
 294
 295     const struct cfm_common_header_t *cfm_common_header;
 296     const struct cfm_tlv_header_t *cfm_tlv_header;
 297     const u_int8_t *tptr, *tlv_ptr, *ma_name, *ma_nameformat, *ma_namelength;
 298     u_int hexdump, tlen, cfm_tlv_len, cfm_tlv_type, ccm_interval;
 299
 300
 301     union {
 302         const struct cfm_ccm_t *cfm_ccm;
 303         const struct cfm_lbm_t *cfm_lbm;
 304         const struct cfm_ltm_t *cfm_ltm;
 305         const struct cfm_ltr_t *cfm_ltr;
 306     } msg_ptr;
 307
 308     tptr=pptr;
 309     cfm_common_header = (const struct cfm_common_header_t *)pptr;
 310     TCHECK(*cfm_common_header);
 311
 312     /*
 313      * Sanity checking of the header.
 314      */
 315     if (CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version) != CFM_VERSION) {
 316         printf("CFMv%u not supported, length %u",
 317                CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version), length);
 318         return;
 319     }
 320
 321     printf("CFMv%u %s, MD Level %u, length %u",
 322            CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version),
 323            tok2str(cfm_opcode_values, "unknown (%u)", cfm_common_header->opcode),
 324            CFM_EXTRACT_MD_LEVEL(cfm_common_header->mdlevel_version),
 325            length);
 326
 327     /*
 328      * In non-verbose mode just print the opcode and md-level.
 329      */
 330     if (vflag < 1) {
 331         return;
 332     }
 333
 334     printf("\n\tFirst TLV offset %u", cfm_common_header->first_tlv_offset);
 335
 336     tptr += sizeof(const struct cfm_common_header_t);
 337     tlen = length - sizeof(struct cfm_common_header_t);
 338
 339     switch (cfm_common_header->opcode) {
 340     case CFM_OPCODE_CCM:
 341         msg_ptr.cfm_ccm = (const struct cfm_ccm_t *)tptr;
 342
 343         ccm_interval = CFM_EXTRACT_CCM_INTERVAL(cfm_common_header->flags);
 344         printf(", Flags [CCM Interval %u%s]",
 345                ccm_interval,
 346                cfm_common_header->flags & CFM_CCM_RDI_FLAG ?
 347                ", RDI" : "");
 348
 349         /*
 350          * Resolve the CCM interval field.
 351          */
 352         if (ccm_interval) {
 353             printf("\n\t  CCM Interval %.3fs"
 354                    ", min CCM Lifetime %.3fs, max CCM Lifetime %.3fs",
 355                    ccm_interval_base[ccm_interval],
 356                    ccm_interval_base[ccm_interval] * CCM_INTERVAL_MIN_MULTIPLIER,
 357                    ccm_interval_base[ccm_interval] * CCM_INTERVAL_MAX_MULTIPLIER);
 358         }
 359
 360         printf("\n\t  Sequence Number 0x%08x, MA-End-Point-ID 0x%04x",
 361                EXTRACT_32BITS(msg_ptr.cfm_ccm->sequence),
 362                EXTRACT_16BITS(msg_ptr.cfm_ccm->ma_epi));
 363
 364
 365         /*
 366          * Resolve the MD fields.
 367          */
 368         printf("\n\t  MD Name Format %s (%u), MD Name length %u",
 369                tok2str(cfm_md_nameformat_values, "Unknown",
 370                        msg_ptr.cfm_ccm->md_nameformat),
 371                msg_ptr.cfm_ccm->md_nameformat,
 372                msg_ptr.cfm_ccm->md_namelength);
 373
 374         if (msg_ptr.cfm_ccm->md_nameformat != CFM_CCM_MD_FORMAT_NONE) {
 375             printf("\n\t  MD Name: ");
 376             switch (msg_ptr.cfm_ccm->md_nameformat) {
 377             case CFM_CCM_MD_FORMAT_DNS:
 378             case CFM_CCM_MD_FORMAT_CHAR:
 379                 safeputs((const char *)msg_ptr.cfm_ccm->md_name, msg_ptr.cfm_ccm->md_namelength);
 380                 break;
 381
 382             case CFM_CCM_MD_FORMAT_MAC:
 383                 printf("\n\t  MAC %s", etheraddr_string(
 384                            msg_ptr.cfm_ccm->md_name));
 385                 break;
 386
 387                 /* FIXME add printers for those MD formats - hexdump for now */
 388             case CFM_CCM_MA_FORMAT_8021:
 389             default:
 390                 print_unknown_data(msg_ptr.cfm_ccm->md_name, "\n\t    ",
 391                                    msg_ptr.cfm_ccm->md_namelength);
 392             }
 393         }
 394
 395
 396         /*
 397          * Resolve the MA fields.
 398          */
 399         ma_nameformat = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength;
 400         ma_namelength = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength + 1;
 401         ma_name = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength + 2;
 402
 403         printf("\n\t  MA Name-Format %s (%u), MA name length %u",
 404                tok2str(cfm_ma_nameformat_values, "Unknown",
 405                        *ma_nameformat),
 406                *ma_nameformat,
 407                *ma_namelength);
 408
 409         printf("\n\t  MA Name: ");
 410         switch (*ma_nameformat) {
 411         case CFM_CCM_MA_FORMAT_CHAR:
 412             safeputs((const char *)ma_name, *ma_namelength);
 413             break;
 414
 415             /* FIXME add printers for those MA formats - hexdump for now */
 416         case CFM_CCM_MA_FORMAT_8021:
 417         case CFM_CCM_MA_FORMAT_VID:
 418         case CFM_CCM_MA_FORMAT_INT:
 419         case CFM_CCM_MA_FORMAT_VPN:
 420         default:
 421             print_unknown_data(ma_name, "\n\t    ", *ma_namelength);
 422         }
 423         break;
 424
 425     case CFM_OPCODE_LTM:
 426         msg_ptr.cfm_ltm = (const struct cfm_ltm_t *)tptr;
 427
 428         printf(", Flags [%s]",
 429                bittok2str(cfm_ltm_flag_values, "none",  cfm_common_header->flags));
 430
 431         printf("\n\t  Transaction-ID 0x%08x, Egress-ID %s, ttl %u",
 432                EXTRACT_32BITS(msg_ptr.cfm_ltm->transaction_id),
 433                cfm_egress_id_string(msg_ptr.cfm_ltm->egress_id),
 434                msg_ptr.cfm_ltm->ttl);
 435
 436         printf("\n\t  Original-MAC %s, Target-MAC %s",
 437                etheraddr_string(msg_ptr.cfm_ltm->original_mac),
 438                etheraddr_string(msg_ptr.cfm_ltm->target_mac));
 439         break;
 440
 441     case CFM_OPCODE_LTR:
 442         msg_ptr.cfm_ltr = (const struct cfm_ltr_t *)tptr;
 443
 444         printf(", Flags [%s]",
 445                bittok2str(cfm_ltr_flag_values, "none",  cfm_common_header->flags));
 446
 447         printf("\n\t  Transaction-ID 0x%08x, Last-Egress-ID %s",
 448                EXTRACT_32BITS(msg_ptr.cfm_ltr->transaction_id),
 449                cfm_egress_id_string(msg_ptr.cfm_ltr->last_egress_id));
 450
 451         printf("\n\t  Next-Egress-ID %s, ttl %u",
 452                cfm_egress_id_string(msg_ptr.cfm_ltr->next_egress_id),
 453                msg_ptr.cfm_ltr->ttl);
 454
 455         printf("\n\t  Replay-Action %s (%u)",
 456                tok2str(cfm_ltr_replay_action_values,
 457                        "Unknown",
 458                        msg_ptr.cfm_ltr->replay_action),
 459                msg_ptr.cfm_ltr->replay_action);
 460         break;
 461
 462         /*
 463          * No message decoder yet.
 464          * Hexdump everything up until the start of the TLVs
 465          */
 466     case CFM_OPCODE_LBR:
 467     case CFM_OPCODE_LBM:
 468     default:
 469         if (tlen > cfm_common_header->first_tlv_offset) {
 470             print_unknown_data(tptr, "\n\t  ",
 471                                tlen -  cfm_common_header->first_tlv_offset);
 472         }
 473         break;
 474     }
 475
 476     /*
 477      * Sanity check for not walking off.
 478      */
 479     if (tlen <= cfm_common_header->first_tlv_offset) {
 480         return;
 481     }
 482
 483     tptr += cfm_common_header->first_tlv_offset;
 484     tlen -= cfm_common_header->first_tlv_offset;
 485
 486     while (tlen > 0) {
 487         cfm_tlv_header = (const struct cfm_tlv_header_t *)tptr;
 488
 489         /* Enough to read the tlv type ? */
 490         TCHECK2(*tptr, 1);
 491         cfm_tlv_type=cfm_tlv_header->type;
 492
 493         if (cfm_tlv_type != CFM_TLV_END) {
 494             /* did we capture enough for fully decoding the object header ? */
 495             TCHECK2(*tptr, sizeof(struct cfm_tlv_header_t));
 496             cfm_tlv_len=EXTRACT_16BITS(&cfm_tlv_header->length);
 497         } else {
 498             cfm_tlv_len = 0;
 499         }
 500
 501         printf("\n\t%s TLV (0x%02x), length %u",
 502                tok2str(cfm_tlv_values, "Unknown", cfm_tlv_type),
 503                cfm_tlv_type,
 504                cfm_tlv_len);
 505
 506         /* sanity check for not walking off and infinite loop check. */
 507         if ((cfm_tlv_type != CFM_TLV_END) &&
 508             ((cfm_tlv_len + sizeof(struct cfm_tlv_header_t) > tlen) ||
 509              (!cfm_tlv_len))) {
 510             print_unknown_data(tptr,"\n\t  ",tlen);
 511             return;
 512         }
 513
 514         tptr += sizeof(struct cfm_tlv_header_t);
 515         tlen -= sizeof(struct cfm_tlv_header_t);
 516         tlv_ptr = tptr;
 517
 518         /* did we capture enough for fully decoding the object ? */
 519         if (cfm_tlv_type != CFM_TLV_END) {
 520             TCHECK2(*tptr, cfm_tlv_len);
 521         }
 522         hexdump = FALSE;
 523
 524         switch(cfm_tlv_type) {
 525         case CFM_TLV_END:
 526             /* we are done - bail out */
 527             return;
 528
 529         case CFM_TLV_PORT_STATUS:
 530             printf(", Status: %s (%u)",
 531                    tok2str(cfm_tlv_port_status_values, "Unknown", *tptr),
 532                    *tptr);
 533             break;
 534
 535         case CFM_TLV_INTERFACE_STATUS:
 536             printf(", Status: %s (%u)",
 537                    tok2str(cfm_tlv_interface_status_values, "Unknown", *tptr),
 538                    *tptr);
 539             break;
 540
 541         case CFM_TLV_PRIVATE:
 542             printf(", Vendor: %s (%u), Sub-Type %u",
 543                    tok2str(oui_values,"Unknown", EXTRACT_24BITS(tptr)),
 544                    EXTRACT_24BITS(tptr),
 545                    *(tptr+3));
 546             hexdump = TRUE;
 547             break;
 548
 549         case CFM_TLV_SENDER_ID:
 550         {
 551             u_int chassis_id_type, chassis_id_length;
 552             u_int mgmt_addr_length;
 553
 554             /*
 555              * Check if there is a Chassis-ID.
 556              */
 557             chassis_id_length = *tptr;
 558             if (chassis_id_length > tlen) {
 559                 hexdump = TRUE;
 560                 break;
 561             }
 562
 563             tptr++;
 564             tlen--;
 565
 566             if (chassis_id_length) {
 567                 chassis_id_type = *tptr;
 568                 printf("\n\t  Chassis-ID Type %s (%u), Chassis-ID length %u",
 569                        tok2str(cfm_tlv_senderid_chassisid_values,
 570                                "Unknown",
 571                                chassis_id_type),
 572                        chassis_id_type,
 573                        chassis_id_length);
 574
 575                 switch (chassis_id_type) {
 576                 case CFM_CHASSIS_ID_MAC_ADDRESS:
 577                     printf("\n\t  MAC %s", etheraddr_string(tptr+1));
 578                     break;
 579
 580                 case CFM_CHASSIS_ID_NETWORK_ADDRESS:
 581                     hexdump |= cfm_mgmt_addr_print(tptr);
 582                     break;
 583
 584                 case CFM_CHASSIS_ID_INTERFACE_NAME: /* fall through */
 585                 case CFM_CHASSIS_ID_INTERFACE_ALIAS:
 586                 case CFM_CHASSIS_ID_LOCAL:
 587                 case CFM_CHASSIS_ID_CHASSIS_COMPONENT:
 588                 case CFM_CHASSIS_ID_PORT_COMPONENT:
 589                     safeputs((const char *)tptr+1, chassis_id_length);
 590                     break;
 591
 592                 default:
 593                     hexdump = TRUE;
 594                     break;
 595                 }
 596             }
 597
 598             tptr += chassis_id_length;
 599             tlen -= chassis_id_length;
 600
 601             /*
 602              * Check if there is a Management Address.
 603              */
 604             mgmt_addr_length = *tptr;
 605             if (mgmt_addr_length > tlen) {
 606                 hexdump = TRUE;
 607                 break;
 608             }
 609
 610             tptr++;
 611             tlen--;
 612
 613             if (mgmt_addr_length) {
 614                 hexdump |= cfm_mgmt_addr_print(tptr);
 615             }
 616
 617             tptr += mgmt_addr_length;
 618             tlen -= mgmt_addr_length;
 619
 620         }
 621         break;
 622
 623             /*
 624              * FIXME those are the defined TLVs that lack a decoder
 625              * you are welcome to contribute code ;-)
 626              */
 627
 628         case CFM_TLV_DATA:
 629         case CFM_TLV_REPLY_INGRESS:
 630         case CFM_TLV_REPLY_EGRESS:
 631         default:
 632             hexdump = TRUE;
 633             break;
 634         }
 635         /* do we want to see an additional hexdump ? */
 636         if (hexdump || vflag > 1)
 637             print_unknown_data(tlv_ptr, "\n\t  ", cfm_tlv_len);
 638
 639         tptr+=cfm_tlv_len;
 640         tlen-=cfm_tlv_len;
 641     }
 642     return;
 643 trunc:
 644     printf("\n\t\t packet exceeded snapshot");
 645 }