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 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include "interface.h"
  31 #include "extract.h"
  32 #include "ether.h"
  33 #include "addrtoname.h"
  34 #include "oui.h"
  35 #include "af.h"
  36
  37 /*
  38  * Prototypes
  39  */
  40 const char * cfm_egress_id_string(register const u_char *);
  41 int cfm_mgmt_addr_print(register const u_char *);
  42
  43 struct cfm_common_header_t {
  44     u_int8_t mdlevel_version;
  45     u_int8_t opcode;
  46     u_int8_t flags;
  47     u_int8_t first_tlv_offset;
  48 };
  49
  50 #define CFM_VERSION 0
  51 #define CFM_EXTRACT_VERSION(x) (((x)&0x1f))
  52 #define CFM_EXTRACT_MD_LEVEL(x) (((x)&0xe0)>>5)
  53
  54 #define CFM_OPCODE_CCM 1
  55 #define CFM_OPCODE_LBR 2
  56 #define CFM_OPCODE_LBM 3
  57 #define CFM_OPCODE_LTR 4
  58 #define CFM_OPCODE_LTM 5
  59
  60 static const struct tok cfm_opcode_values[] = {
  61     { CFM_OPCODE_CCM, "Continouity Check Message"},
  62     { CFM_OPCODE_LBR, "Loopback Reply"},
  63     { CFM_OPCODE_LBM, "Loopback Message"},
  64     { CFM_OPCODE_LTR, "Linktrace Reply"},
  65     { CFM_OPCODE_LTM, "Linktrace Message"},
  66     { 0, NULL}
  67 };
  68
  69 /*
  70  * Message Formats.
  71  */
  72 struct cfm_ccm_t {
  73     u_int8_t sequence[4];
  74     u_int8_t ma_epi[2];
  75     u_int8_t md_nameformat;
  76     u_int8_t md_namelength;
  77     u_int8_t md_name[46]; /* md name and short ma name */
  78     u_int8_t reserved_itu[16];
  79     u_int8_t reserved[6];
  80 };
  81
  82 /*
  83  * Timer Bases for the CCM Interval field.
  84  * Expressed in units of seconds.
  85  */
  86 const float ccm_interval_base[8] = {0, 0.003333, 0.01, 0.1, 1, 10, 60, 600};
  87 #define CCM_INTERVAL_MIN_MULTIPLIER 3.25
  88 #define CCM_INTERVAL_MAX_MULTIPLIER 3.5
  89
  90 #define CFM_CCM_RDI_FLAG 0x80
  91 #define CFM_EXTRACT_CCM_INTERVAL(x) (((x)&0x07))
  92
  93 #define CFM_CCM_MD_FORMAT_8021 0
  94 #define CFM_CCM_MD_FORMAT_NONE 1
  95 #define CFM_CCM_MD_FORMAT_DNS  2
  96 #define CFM_CCM_MD_FORMAT_MAC  3
  97 #define CFM_CCM_MD_FORMAT_CHAR 4
  98
  99 static const struct tok cfm_md_nameformat_values[] = {
 100     { CFM_CCM_MD_FORMAT_8021, "IEEE 802.1"},
 101     { CFM_CCM_MD_FORMAT_NONE, "No MD Name present"},
 102     { CFM_CCM_MD_FORMAT_DNS, "DNS string"},
 103     { CFM_CCM_MD_FORMAT_MAC, "MAC + 16Bit Integer"},
 104     { CFM_CCM_MD_FORMAT_CHAR, "Character string"},
 105     { 0, NULL}
 106 };
 107
 108 #define CFM_CCM_MA_FORMAT_8021 0
 109 #define CFM_CCM_MA_FORMAT_VID  1
 110 #define CFM_CCM_MA_FORMAT_CHAR 2
 111 #define CFM_CCM_MA_FORMAT_INT  3
 112 #define CFM_CCM_MA_FORMAT_VPN  4
 113
 114 static const struct tok cfm_ma_nameformat_values[] = {
 115     { CFM_CCM_MA_FORMAT_8021, "IEEE 802.1"},
 116     { CFM_CCM_MA_FORMAT_VID, "Primary VID"},
 117     { CFM_CCM_MA_FORMAT_CHAR, "Character string"},
 118     { CFM_CCM_MA_FORMAT_INT, "16Bit Integer"},
 119     { CFM_CCM_MA_FORMAT_VPN, "RFC2685 VPN-ID"},
 120     { 0, NULL}
 121 };
 122
 123 struct cfm_lbm_t {
 124     u_int8_t transaction_id[4];
 125     u_int8_t reserved[4];
 126 };
 127
 128 struct cfm_ltm_t {
 129     u_int8_t transaction_id[4];
 130     u_int8_t egress_id[8];
 131     u_int8_t ttl;
 132     u_int8_t original_mac[ETHER_ADDR_LEN];
 133     u_int8_t target_mac[ETHER_ADDR_LEN];
 134     u_int8_t reserved[3];
 135 };
 136
 137 static const struct tok cfm_ltm_flag_values[] = {
 138     { 0x80, "Use Forwarding-DB only"},
 139     { 0, NULL}
 140 };
 141
 142 struct cfm_ltr_t {
 143     u_int8_t transaction_id[4];
 144     u_int8_t last_egress_id[8];
 145     u_int8_t next_egress_id[8];
 146     u_int8_t ttl;
 147     u_int8_t replay_action;
 148     u_int8_t reserved[6];
 149 };
 150
 151 static const struct tok cfm_ltr_flag_values[] = {
 152     { 0x80, "UseFDB Only"},
 153     { 0x40, "FwdYes"},
 154     { 0x20, "Terminal MEP"},
 155     { 0, NULL}
 156 };
 157
 158 static const struct tok cfm_ltr_replay_action_values[] = {
 159     { 1, "Exact Match"},
 160     { 2, "Filtering DB"},
 161     { 3, "MIP CCM DB"},
 162     { 0, NULL}
 163 };
 164
 165
 166 #define CFM_TLV_END 0
 167 #define CFM_TLV_SENDER_ID 1
 168 #define CFM_TLV_PORT_STATUS 2
 169 #define CFM_TLV_INTERFACE_STATUS 3
 170 #define CFM_TLV_DATA 4
 171 #define CFM_TLV_REPLY_INGRESS 5
 172 #define CFM_TLV_REPLY_EGRESS 6
 173 #define CFM_TLV_PRIVATE 31
 174
 175 static const struct tok cfm_tlv_values[] = {
 176     { CFM_TLV_END, "End"},
 177     { CFM_TLV_SENDER_ID, "Sender ID"},
 178     { CFM_TLV_PORT_STATUS, "Port status"},
 179     { CFM_TLV_INTERFACE_STATUS, "Interface status"},
 180     { CFM_TLV_DATA, "Data"},
 181     { CFM_TLV_REPLY_INGRESS, "Reply Ingress"},
 182     { CFM_TLV_REPLY_EGRESS, "Reply Egress"},
 183     { CFM_TLV_PRIVATE, "Organization Specific"},
 184     { 0, NULL}
 185 };
 186
 187 /*
 188  * TLVs
 189  */
 190
 191 struct cfm_tlv_header_t {
 192     u_int8_t type;
 193     u_int8_t length[2];
 194 };
 195
 196 /* FIXME define TLV formats */
 197
 198 static const struct tok cfm_tlv_port_status_values[] = {
 199     { 1, "Blocked"},
 200     { 2, "Up"},
 201     { 0, NULL}
 202 };
 203
 204 static const struct tok cfm_tlv_interface_status_values[] = {
 205     { 1, "Up"},
 206     { 2, "Down"},
 207     { 3, "Testing"},
 208     { 5, "Dormant"},
 209     { 6, "not present"},
 210     { 7, "lower Layer down"},
 211     { 0, NULL}
 212 };
 213
 214 #define CFM_CHASSIS_ID_CHASSIS_COMPONENT 1
 215 #define CFM_CHASSIS_ID_INTERFACE_ALIAS 2
 216 #define CFM_CHASSIS_ID_PORT_COMPONENT 3
 217 #define CFM_CHASSIS_ID_MAC_ADDRESS 4
 218 #define CFM_CHASSIS_ID_NETWORK_ADDRESS 5
 219 #define CFM_CHASSIS_ID_INTERFACE_NAME 6
 220 #define CFM_CHASSIS_ID_LOCAL 7
 221
 222 static const struct tok cfm_tlv_senderid_chassisid_values[] = {
 223     { 0, "Reserved"},
 224     { CFM_CHASSIS_ID_CHASSIS_COMPONENT, "Chassis component"},
 225     { CFM_CHASSIS_ID_INTERFACE_ALIAS, "Interface alias"},
 226     { CFM_CHASSIS_ID_PORT_COMPONENT, "Port component"},
 227     { CFM_CHASSIS_ID_MAC_ADDRESS, "MAC address"},
 228     { CFM_CHASSIS_ID_NETWORK_ADDRESS, "Network address"},
 229     { CFM_CHASSIS_ID_INTERFACE_NAME, "Interface name"},
 230     { CFM_CHASSIS_ID_LOCAL, "Locally assigned"},
 231     { 0, NULL}
 232 };
 233
 234
 235 int
 236 cfm_mgmt_addr_print(register const u_char *tptr) {
 237
 238     u_int mgmt_addr_type;
 239     u_int hexdump =  FALSE;
 240
 241     /*
 242      * Altough AFIs are tpically 2 octects wide,
 243      * 802.1ab specifies that this field width
 244      * is only once octet
 245      */
 246     mgmt_addr_type = *tptr;
 247     printf("\n\t  Management Address Type %s (%u)",
 248            tok2str(af_values, "Unknown", mgmt_addr_type),
 249            mgmt_addr_type);
 250
 251     /*
 252      * Resolve the passed in Address.
 253      */
 254     switch(mgmt_addr_type) {
 255     case AFNUM_INET:
 256         printf(", %s", ipaddr_string(tptr + 1));
 257         break;
 258
 259 #ifdef INET6
 260     case AFNUM_INET6:
 261         printf(", %s", ip6addr_string(tptr + 1));
 262         break;
 263 #endif
 264
 265     default:
 266         hexdump = TRUE;
 267         break;
 268     }
 269
 270     return hexdump;
 271 }
 272
 273 /*
 274  * The egress-ID string is a 16-Bit string plus a MAC address.
 275  */
 276 const char *
 277 cfm_egress_id_string(register const u_char *tptr) {
 278     static char egress_id_buffer[80];
 279
 280     snprintf(egress_id_buffer, sizeof(egress_id_buffer),
 281              "MAC 0x%4x-%s",
 282              EXTRACT_16BITS(tptr),
 283              etheraddr_string(tptr+2));
 284
 285     return egress_id_buffer;
 286 }
 287
 288 void
 289 cfm_print(register const u_char *pptr, register u_int length) {
 290
 291     const struct cfm_common_header_t *cfm_common_header;
 292     const struct cfm_tlv_header_t *cfm_tlv_header;
 293     const u_int8_t *tptr, *tlv_ptr, *ma_name, *ma_nameformat, *ma_namelength;
 294     u_int hexdump, tlen, cfm_tlv_len, cfm_tlv_type, ccm_interval;
 295
 296
 297     union {
 298         const struct cfm_ccm_t *cfm_ccm;
 299         const struct cfm_lbm_t *cfm_lbm;
 300         const struct cfm_ltm_t *cfm_ltm;
 301         const struct cfm_ltr_t *cfm_ltr;
 302     } msg_ptr;
 303
 304     tptr=pptr;
 305     cfm_common_header = (const struct cfm_common_header_t *)pptr;
 306     TCHECK(*cfm_common_header);
 307
 308     /*
 309      * Sanity checking of the header.
 310      */
 311     if (CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version) != CFM_VERSION) {
 312         printf("CFMv%u not supported, length %u",
 313                CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version), length);
 314         return;
 315     }
 316
 317     printf("CFMv%u %s, MD Level %u, length %u",
 318            CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version),
 319            tok2str(cfm_opcode_values, "unknown (%u)", cfm_common_header->opcode),
 320            CFM_EXTRACT_MD_LEVEL(cfm_common_header->mdlevel_version),
 321            length);
 322
 323     /*
 324      * In non-verbose mode just print the opcode and md-level.
 325      */
 326     if (vflag < 1) {
 327         return;
 328     }
 329
 330     printf("\n\tFirst TLV offset %u", cfm_common_header->first_tlv_offset);
 331
 332     tptr += sizeof(const struct cfm_common_header_t);
 333     tlen = length - sizeof(struct cfm_common_header_t);
 334
 335     switch (cfm_common_header->opcode) {
 336     case CFM_OPCODE_CCM:
 337         msg_ptr.cfm_ccm = (const struct cfm_ccm_t *)tptr;
 338
 339         ccm_interval = CFM_EXTRACT_CCM_INTERVAL(cfm_common_header->flags);
 340         printf(", Flags [CCM Interval %u%s]",
 341                ccm_interval,
 342                cfm_common_header->flags & CFM_CCM_RDI_FLAG ?
 343                ", RDI" : "");
 344
 345         /*
 346          * Resolve the CCM interval field.
 347          */
 348         if (ccm_interval) {
 349             printf("\n\t  CCM Interval %.3fs"
 350                    ", min CCM Lifetime %.3fs, max CCM Lifetime %.3fs",
 351                    ccm_interval_base[ccm_interval],
 352                    ccm_interval_base[ccm_interval] * CCM_INTERVAL_MIN_MULTIPLIER,
 353                    ccm_interval_base[ccm_interval] * CCM_INTERVAL_MAX_MULTIPLIER);
 354         }
 355
 356         printf("\n\t  Sequence Number 0x%08x, MA-End-Point-ID 0x%04x",
 357                EXTRACT_32BITS(msg_ptr.cfm_ccm->sequence),
 358                EXTRACT_16BITS(msg_ptr.cfm_ccm->ma_epi));
 359
 360
 361         /*
 362          * Resolve the MD fields.
 363          */
 364         printf("\n\t  MD Name Format %s (%u), MD Name length %u",
 365                tok2str(cfm_md_nameformat_values, "Unknown",
 366                        msg_ptr.cfm_ccm->md_nameformat),
 367                msg_ptr.cfm_ccm->md_nameformat,
 368                msg_ptr.cfm_ccm->md_namelength);
 369
 370         if (msg_ptr.cfm_ccm->md_nameformat != CFM_CCM_MD_FORMAT_NONE) {
 371             printf("\n\t  MD Name: ");
 372             switch (msg_ptr.cfm_ccm->md_nameformat) {
 373             case CFM_CCM_MD_FORMAT_DNS:
 374             case CFM_CCM_MD_FORMAT_CHAR:
 375                 safeputs(gndo, msg_ptr.cfm_ccm->md_name, msg_ptr.cfm_ccm->md_namelength);
 376                 break;
 377
 378             case CFM_CCM_MD_FORMAT_MAC:
 379                 printf("\n\t  MAC %s", etheraddr_string(
 380                            msg_ptr.cfm_ccm->md_name));
 381                 break;
 382
 383                 /* FIXME add printers for those MD formats - hexdump for now */
 384             case CFM_CCM_MA_FORMAT_8021:
 385             default:
 386                 print_unknown_data(gndo,msg_ptr.cfm_ccm->md_name, "\n\t    ",
 387                                    msg_ptr.cfm_ccm->md_namelength);
 388             }
 389         }
 390
 391
 392         /*
 393          * Resolve the MA fields.
 394          */
 395         ma_nameformat = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength;
 396         ma_namelength = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength + 1;
 397         ma_name = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength + 2;
 398
 399         printf("\n\t  MA Name-Format %s (%u), MA name length %u",
 400                tok2str(cfm_ma_nameformat_values, "Unknown",
 401                        *ma_nameformat),
 402                *ma_nameformat,
 403                *ma_namelength);
 404
 405         printf("\n\t  MA Name: ");
 406         switch (*ma_nameformat) {
 407         case CFM_CCM_MA_FORMAT_CHAR:
 408             safeputs(gndo, ma_name, *ma_namelength);
 409             break;
 410
 411             /* FIXME add printers for those MA formats - hexdump for now */
 412         case CFM_CCM_MA_FORMAT_8021:
 413         case CFM_CCM_MA_FORMAT_VID:
 414         case CFM_CCM_MA_FORMAT_INT:
 415         case CFM_CCM_MA_FORMAT_VPN:
 416         default:
 417             print_unknown_data(gndo,ma_name, "\n\t    ", *ma_namelength);
 418         }
 419         break;
 420
 421     case CFM_OPCODE_LTM:
 422         msg_ptr.cfm_ltm = (const struct cfm_ltm_t *)tptr;
 423
 424         printf(", Flags [%s]",
 425                bittok2str(cfm_ltm_flag_values, "none",  cfm_common_header->flags));
 426
 427         printf("\n\t  Transaction-ID 0x%08x, Egress-ID %s, ttl %u",
 428                EXTRACT_32BITS(msg_ptr.cfm_ltm->transaction_id),
 429                cfm_egress_id_string(msg_ptr.cfm_ltm->egress_id),
 430                msg_ptr.cfm_ltm->ttl);
 431
 432         printf("\n\t  Original-MAC %s, Target-MAC %s",
 433                etheraddr_string(msg_ptr.cfm_ltm->original_mac),
 434                etheraddr_string(msg_ptr.cfm_ltm->target_mac));
 435         break;
 436
 437     case CFM_OPCODE_LTR:
 438         msg_ptr.cfm_ltr = (const struct cfm_ltr_t *)tptr;
 439
 440         printf(", Flags [%s]",
 441                bittok2str(cfm_ltr_flag_values, "none",  cfm_common_header->flags));
 442
 443         printf("\n\t  Transaction-ID 0x%08x, Last-Egress-ID %s",
 444                EXTRACT_32BITS(msg_ptr.cfm_ltr->transaction_id),
 445                cfm_egress_id_string(msg_ptr.cfm_ltr->last_egress_id));
 446
 447         printf("\n\t  Next-Egress-ID %s, ttl %u",
 448                cfm_egress_id_string(msg_ptr.cfm_ltr->next_egress_id),
 449                msg_ptr.cfm_ltr->ttl);
 450
 451         printf("\n\t  Replay-Action %s (%u)",
 452                tok2str(cfm_ltr_replay_action_values,
 453                        "Unknown",
 454                        msg_ptr.cfm_ltr->replay_action),
 455                msg_ptr.cfm_ltr->replay_action);
 456         break;
 457
 458         /*
 459          * No message decoder yet.
 460          * Hexdump everything up until the start of the TLVs
 461          */
 462     case CFM_OPCODE_LBR:
 463     case CFM_OPCODE_LBM:
 464     default:
 465         if (tlen > cfm_common_header->first_tlv_offset) {
 466             print_unknown_data(gndo,tptr, "\n\t  ",
 467                                tlen -  cfm_common_header->first_tlv_offset);
 468         }
 469         break;
 470     }
 471
 472     /*
 473      * Sanity check for not walking off.
 474      */
 475     if (tlen <= cfm_common_header->first_tlv_offset) {
 476         return;
 477     }
 478
 479     tptr += cfm_common_header->first_tlv_offset;
 480     tlen -= cfm_common_header->first_tlv_offset;
 481
 482     while (tlen > 0) {
 483         cfm_tlv_header = (const struct cfm_tlv_header_t *)tptr;
 484
 485         /* Enough to read the tlv type ? */
 486         TCHECK2(*tptr, 1);
 487         cfm_tlv_type=cfm_tlv_header->type;
 488
 489         if (cfm_tlv_type != CFM_TLV_END) {
 490             /* did we capture enough for fully decoding the object header ? */
 491             TCHECK2(*tptr, sizeof(struct cfm_tlv_header_t));
 492             cfm_tlv_len=EXTRACT_16BITS(&cfm_tlv_header->length);
 493         } else {
 494             cfm_tlv_len = 0;
 495         }
 496
 497         printf("\n\t%s TLV (0x%02x), length %u",
 498                tok2str(cfm_tlv_values, "Unknown", cfm_tlv_type),
 499                cfm_tlv_type,
 500                cfm_tlv_len);
 501
 502         /* sanity check for not walking off and infinite loop check. */
 503         if ((cfm_tlv_type != CFM_TLV_END) &&
 504             ((cfm_tlv_len + sizeof(struct cfm_tlv_header_t) > tlen) ||
 505              (!cfm_tlv_len))) {
 506             print_unknown_data(gndo,tptr,"\n\t  ",tlen);
 507             return;
 508         }
 509
 510         tptr += sizeof(struct cfm_tlv_header_t);
 511         tlen -= sizeof(struct cfm_tlv_header_t);
 512         tlv_ptr = tptr;
 513
 514         /* did we capture enough for fully decoding the object ? */
 515         if (cfm_tlv_type != CFM_TLV_END) {
 516             TCHECK2(*tptr, cfm_tlv_len);
 517         }
 518         hexdump = FALSE;
 519
 520         switch(cfm_tlv_type) {
 521         case CFM_TLV_END:
 522             /* we are done - bail out */
 523             return;
 524
 525         case CFM_TLV_PORT_STATUS:
 526             printf(", Status: %s (%u)",
 527                    tok2str(cfm_tlv_port_status_values, "Unknown", *tptr),
 528                    *tptr);
 529             break;
 530
 531         case CFM_TLV_INTERFACE_STATUS:
 532             printf(", Status: %s (%u)",
 533                    tok2str(cfm_tlv_interface_status_values, "Unknown", *tptr),
 534                    *tptr);
 535             break;
 536
 537         case CFM_TLV_PRIVATE:
 538             printf(", Vendor: %s (%u), Sub-Type %u",
 539                    tok2str(oui_values,"Unknown", EXTRACT_24BITS(tptr)),
 540                    EXTRACT_24BITS(tptr),
 541                    *(tptr+3));
 542             hexdump = TRUE;
 543             break;
 544
 545         case CFM_TLV_SENDER_ID:
 546         {
 547             u_int chassis_id_type, chassis_id_length;
 548             u_int mgmt_addr_length;
 549
 550             /*
 551              * Check if there is a Chassis-ID.
 552              */
 553             chassis_id_length = *tptr;
 554             if (chassis_id_length > tlen) {
 555                 hexdump = TRUE;
 556                 break;
 557             }
 558
 559             tptr++;
 560             tlen--;
 561
 562             if (chassis_id_length) {
 563                 chassis_id_type = *tptr;
 564                 printf("\n\t  Chassis-ID Type %s (%u), Chassis-ID length %u",
 565                        tok2str(cfm_tlv_senderid_chassisid_values,
 566                                "Unknown",
 567                                chassis_id_type),
 568                        chassis_id_type,
 569                        chassis_id_length);
 570
 571                 switch (chassis_id_type) {
 572                 case CFM_CHASSIS_ID_MAC_ADDRESS:
 573                     printf("\n\t  MAC %s", etheraddr_string(tptr+1));
 574                     break;
 575
 576                 case CFM_CHASSIS_ID_NETWORK_ADDRESS:
 577                     hexdump |= cfm_mgmt_addr_print(tptr);
 578                     break;
 579
 580                 case CFM_CHASSIS_ID_INTERFACE_NAME: /* fall through */
 581                 case CFM_CHASSIS_ID_INTERFACE_ALIAS:
 582                 case CFM_CHASSIS_ID_LOCAL:
 583                 case CFM_CHASSIS_ID_CHASSIS_COMPONENT:
 584                 case CFM_CHASSIS_ID_PORT_COMPONENT:
 585                     safeputs(gndo, tptr + 1, chassis_id_length);
 586                     break;
 587
 588                 default:
 589                     hexdump = TRUE;
 590                     break;
 591                 }
 592             }
 593
 594             tptr += chassis_id_length;
 595             tlen -= chassis_id_length;
 596
 597             /*
 598              * Check if there is a Management Address.
 599              */
 600             mgmt_addr_length = *tptr;
 601             if (mgmt_addr_length > tlen) {
 602                 hexdump = TRUE;
 603                 break;
 604             }
 605
 606             tptr++;
 607             tlen--;
 608
 609             if (mgmt_addr_length) {
 610                 hexdump |= cfm_mgmt_addr_print(tptr);
 611             }
 612
 613             tptr += mgmt_addr_length;
 614             tlen -= mgmt_addr_length;
 615
 616         }
 617         break;
 618
 619             /*
 620              * FIXME those are the defined TLVs that lack a decoder
 621              * you are welcome to contribute code ;-)
 622              */
 623
 624         case CFM_TLV_DATA:
 625         case CFM_TLV_REPLY_INGRESS:
 626         case CFM_TLV_REPLY_EGRESS:
 627         default:
 628             hexdump = TRUE;
 629             break;
 630         }
 631         /* do we want to see an additional hexdump ? */
 632         if (hexdump || vflag > 1)
 633             print_unknown_data(gndo,tlv_ptr, "\n\t  ", cfm_tlv_len);
 634
 635         tptr+=cfm_tlv_len;
 636         tlen-=cfm_tlv_len;
 637     }
 638     return;
 639 trunc:
 640     printf("\n\t\t packet exceeded snapshot");
 641 }