external/bsd/tcpdump/dist/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 #include <sys/cdefs.h>
  21 #ifndef lint
  22 __RCSID("$NetBSD: print-cfm.c,v 1.6 2015/03/31 21:59:35 christos Exp $");
  23 #endif
  24
  25 #define NETDISSECT_REWORKED
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include <tcpdump-stdinc.h>
  31
  32 #include <stdio.h>
  33
  34 #include "interface.h"
  35 #include "extract.h"
  36 #include "ether.h"
  37 #include "addrtoname.h"
  38 #include "oui.h"
  39 #include "af.h"
  40
  41 struct cfm_common_header_t {
  42     uint8_t mdlevel_version;
  43     uint8_t opcode;
  44     uint8_t flags;
  45     uint8_t first_tlv_offset;
  46 };
  47
  48 #define CFM_VERSION 0
  49 #define CFM_EXTRACT_VERSION(x) (((x)&0x1f))
  50 #define CFM_EXTRACT_MD_LEVEL(x) (((x)&0xe0)>>5)
  51
  52 #define CFM_OPCODE_CCM 1
  53 #define CFM_OPCODE_LBR 2
  54 #define CFM_OPCODE_LBM 3
  55 #define CFM_OPCODE_LTR 4
  56 #define CFM_OPCODE_LTM 5
  57
  58 static const struct tok cfm_opcode_values[] = {
  59     { CFM_OPCODE_CCM, "Continouity Check Message"},
  60     { CFM_OPCODE_LBR, "Loopback Reply"},
  61     { CFM_OPCODE_LBM, "Loopback Message"},
  62     { CFM_OPCODE_LTR, "Linktrace Reply"},
  63     { CFM_OPCODE_LTM, "Linktrace Message"},
  64     { 0, NULL}
  65 };
  66
  67 /*
  68  * Message Formats.
  69  */
  70 struct cfm_ccm_t {
  71     uint8_t sequence[4];
  72     uint8_t ma_epi[2];
  73     uint8_t md_nameformat;
  74     uint8_t md_namelength;
  75     uint8_t md_name[46]; /* md name and short ma name */
  76     uint8_t reserved_itu[16];
  77     uint8_t reserved[6];
  78 };
  79
  80 /*
  81  * Timer Bases for the CCM Interval field.
  82  * Expressed in units of seconds.
  83  */
  84 const float ccm_interval_base[8] = {0, 0.003333, 0.01, 0.1, 1, 10, 60, 600};
  85 #define CCM_INTERVAL_MIN_MULTIPLIER 3.25
  86 #define CCM_INTERVAL_MAX_MULTIPLIER 3.5
  87
  88 #define CFM_CCM_RDI_FLAG 0x80
  89 #define CFM_EXTRACT_CCM_INTERVAL(x) (((x)&0x07))
  90
  91 #define CFM_CCM_MD_FORMAT_8021 0
  92 #define CFM_CCM_MD_FORMAT_NONE 1
  93 #define CFM_CCM_MD_FORMAT_DNS  2
  94 #define CFM_CCM_MD_FORMAT_MAC  3
  95 #define CFM_CCM_MD_FORMAT_CHAR 4
  96
  97 static const struct tok cfm_md_nameformat_values[] = {
  98     { CFM_CCM_MD_FORMAT_8021, "IEEE 802.1"},
  99     { CFM_CCM_MD_FORMAT_NONE, "No MD Name present"},
 100     { CFM_CCM_MD_FORMAT_DNS, "DNS string"},
 101     { CFM_CCM_MD_FORMAT_MAC, "MAC + 16Bit Integer"},
 102     { CFM_CCM_MD_FORMAT_CHAR, "Character string"},
 103     { 0, NULL}
 104 };
 105
 106 #define CFM_CCM_MA_FORMAT_8021 0
 107 #define CFM_CCM_MA_FORMAT_VID  1
 108 #define CFM_CCM_MA_FORMAT_CHAR 2
 109 #define CFM_CCM_MA_FORMAT_INT  3
 110 #define CFM_CCM_MA_FORMAT_VPN  4
 111
 112 static const struct tok cfm_ma_nameformat_values[] = {
 113     { CFM_CCM_MA_FORMAT_8021, "IEEE 802.1"},
 114     { CFM_CCM_MA_FORMAT_VID, "Primary VID"},
 115     { CFM_CCM_MA_FORMAT_CHAR, "Character string"},
 116     { CFM_CCM_MA_FORMAT_INT, "16Bit Integer"},
 117     { CFM_CCM_MA_FORMAT_VPN, "RFC2685 VPN-ID"},
 118     { 0, NULL}
 119 };
 120
 121 struct cfm_lbm_t {
 122     uint8_t transaction_id[4];
 123     uint8_t reserved[4];
 124 };
 125
 126 struct cfm_ltm_t {
 127     uint8_t transaction_id[4];
 128     uint8_t egress_id[8];
 129     uint8_t ttl;
 130     uint8_t original_mac[ETHER_ADDR_LEN];
 131     uint8_t target_mac[ETHER_ADDR_LEN];
 132     uint8_t reserved[3];
 133 };
 134
 135 static const struct tok cfm_ltm_flag_values[] = {
 136     { 0x80, "Use Forwarding-DB only"},
 137     { 0, NULL}
 138 };
 139
 140 struct cfm_ltr_t {
 141     uint8_t transaction_id[4];
 142     uint8_t last_egress_id[8];
 143     uint8_t next_egress_id[8];
 144     uint8_t ttl;
 145     uint8_t replay_action;
 146     uint8_t reserved[6];
 147 };
 148
 149 static const struct tok cfm_ltr_flag_values[] = {
 150     { 0x80, "UseFDB Only"},
 151     { 0x40, "FwdYes"},
 152     { 0x20, "Terminal MEP"},
 153     { 0, NULL}
 154 };
 155
 156 static const struct tok cfm_ltr_replay_action_values[] = {
 157     { 1, "Exact Match"},
 158     { 2, "Filtering DB"},
 159     { 3, "MIP CCM DB"},
 160     { 0, NULL}
 161 };
 162
 163
 164 #define CFM_TLV_END 0
 165 #define CFM_TLV_SENDER_ID 1
 166 #define CFM_TLV_PORT_STATUS 2
 167 #define CFM_TLV_INTERFACE_STATUS 3
 168 #define CFM_TLV_DATA 4
 169 #define CFM_TLV_REPLY_INGRESS 5
 170 #define CFM_TLV_REPLY_EGRESS 6
 171 #define CFM_TLV_PRIVATE 31
 172
 173 static const struct tok cfm_tlv_values[] = {
 174     { CFM_TLV_END, "End"},
 175     { CFM_TLV_SENDER_ID, "Sender ID"},
 176     { CFM_TLV_PORT_STATUS, "Port status"},
 177     { CFM_TLV_INTERFACE_STATUS, "Interface status"},
 178     { CFM_TLV_DATA, "Data"},
 179     { CFM_TLV_REPLY_INGRESS, "Reply Ingress"},
 180     { CFM_TLV_REPLY_EGRESS, "Reply Egress"},
 181     { CFM_TLV_PRIVATE, "Organization Specific"},
 182     { 0, NULL}
 183 };
 184
 185 /*
 186  * TLVs
 187  */
 188
 189 struct cfm_tlv_header_t {
 190     uint8_t type;
 191     uint8_t length[2];
 192 };
 193
 194 /* FIXME define TLV formats */
 195
 196 static const struct tok cfm_tlv_port_status_values[] = {
 197     { 1, "Blocked"},
 198     { 2, "Up"},
 199     { 0, NULL}
 200 };
 201
 202 static const struct tok cfm_tlv_interface_status_values[] = {
 203     { 1, "Up"},
 204     { 2, "Down"},
 205     { 3, "Testing"},
 206     { 5, "Dormant"},
 207     { 6, "not present"},
 208     { 7, "lower Layer down"},
 209     { 0, NULL}
 210 };
 211
 212 #define CFM_CHASSIS_ID_CHASSIS_COMPONENT 1
 213 #define CFM_CHASSIS_ID_INTERFACE_ALIAS 2
 214 #define CFM_CHASSIS_ID_PORT_COMPONENT 3
 215 #define CFM_CHASSIS_ID_MAC_ADDRESS 4
 216 #define CFM_CHASSIS_ID_NETWORK_ADDRESS 5
 217 #define CFM_CHASSIS_ID_INTERFACE_NAME 6
 218 #define CFM_CHASSIS_ID_LOCAL 7
 219
 220 static const struct tok cfm_tlv_senderid_chassisid_values[] = {
 221     { 0, "Reserved"},
 222     { CFM_CHASSIS_ID_CHASSIS_COMPONENT, "Chassis component"},
 223     { CFM_CHASSIS_ID_INTERFACE_ALIAS, "Interface alias"},
 224     { CFM_CHASSIS_ID_PORT_COMPONENT, "Port component"},
 225     { CFM_CHASSIS_ID_MAC_ADDRESS, "MAC address"},
 226     { CFM_CHASSIS_ID_NETWORK_ADDRESS, "Network address"},
 227     { CFM_CHASSIS_ID_INTERFACE_NAME, "Interface name"},
 228     { CFM_CHASSIS_ID_LOCAL, "Locally assigned"},
 229     { 0, NULL}
 230 };
 231
 232
 233 static int
 234 cfm_mgmt_addr_print(netdissect_options *ndo,
 235                     register const u_char *tptr)
 236 {
 237     u_int mgmt_addr_type;
 238     u_int hexdump =  FALSE;
 239
 240     /*
 241      * Altough AFIs are tpically 2 octects wide,
 242      * 802.1ab specifies that this field width
 243      * is only once octet
 244      */
 245     mgmt_addr_type = *tptr;
 246     ND_PRINT((ndo, "\n\t  Management Address Type %s (%u)",
 247            tok2str(af_values, "Unknown", mgmt_addr_type),
 248            mgmt_addr_type));
 249
 250     /*
 251      * Resolve the passed in Address.
 252      */
 253     switch(mgmt_addr_type) {
 254     case AFNUM_INET:
 255         ND_PRINT((ndo, ", %s", ipaddr_string(ndo, tptr + 1)));
 256         break;
 257
 258 #ifdef INET6
 259     case AFNUM_INET6:
 260         ND_PRINT((ndo, ", %s", ip6addr_string(ndo, tptr + 1)));
 261         break;
 262 #endif
 263
 264     default:
 265         hexdump = TRUE;
 266         break;
 267     }
 268
 269     return hexdump;
 270 }
 271
 272 /*
 273  * The egress-ID string is a 16-Bit string plus a MAC address.
 274  */
 275 static const char *
 276 cfm_egress_id_string(netdissect_options *ndo, register const u_char *tptr)
 277 {
 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(ndo, tptr+2));
 284
 285     return egress_id_buffer;
 286 }
 287
 288 void
 289 cfm_print(netdissect_options *ndo,
 290           register const u_char *pptr, register u_int length)
 291 {
 292     const struct cfm_common_header_t *cfm_common_header;
 293     const struct cfm_tlv_header_t *cfm_tlv_header;
 294     const uint8_t *tptr, *tlv_ptr, *ma_name, *ma_nameformat, *ma_namelength;
 295     u_int hexdump, tlen, cfm_tlv_len, cfm_tlv_type, ccm_interval;
 296
 297
 298     union {
 299         const struct cfm_ccm_t *cfm_ccm;
 300         const struct cfm_lbm_t *cfm_lbm;
 301         const struct cfm_ltm_t *cfm_ltm;
 302         const struct cfm_ltr_t *cfm_ltr;
 303     } msg_ptr;
 304
 305     tptr=pptr;
 306     cfm_common_header = (const struct cfm_common_header_t *)pptr;
 307     ND_TCHECK(*cfm_common_header);
 308
 309     /*
 310      * Sanity checking of the header.
 311      */
 312     if (CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version) != CFM_VERSION) {
 313         ND_PRINT((ndo, "CFMv%u not supported, length %u",
 314                CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version), length));
 315         return;
 316     }
 317
 318     ND_PRINT((ndo, "CFMv%u %s, MD Level %u, length %u",
 319            CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version),
 320            tok2str(cfm_opcode_values, "unknown (%u)", cfm_common_header->opcode),
 321            CFM_EXTRACT_MD_LEVEL(cfm_common_header->mdlevel_version),
 322            length));
 323
 324     /*
 325      * In non-verbose mode just print the opcode and md-level.
 326      */
 327     if (ndo->ndo_vflag < 1) {
 328         return;
 329     }
 330
 331     ND_PRINT((ndo, "\n\tFirst TLV offset %u", cfm_common_header->first_tlv_offset));
 332
 333     tptr += sizeof(const struct cfm_common_header_t);
 334     tlen = length - sizeof(struct cfm_common_header_t);
 335
 336     switch (cfm_common_header->opcode) {
 337     case CFM_OPCODE_CCM:
 338         msg_ptr.cfm_ccm = (const struct cfm_ccm_t *)tptr;
 339
 340         ccm_interval = CFM_EXTRACT_CCM_INTERVAL(cfm_common_header->flags);
 341         ND_PRINT((ndo, ", Flags [CCM Interval %u%s]",
 342                ccm_interval,
 343                cfm_common_header->flags & CFM_CCM_RDI_FLAG ?
 344                ", RDI" : ""));
 345
 346         /*
 347          * Resolve the CCM interval field.
 348          */
 349         if (ccm_interval) {
 350             ND_PRINT((ndo, "\n\t  CCM Interval %.3fs"
 351                    ", min CCM Lifetime %.3fs, max CCM Lifetime %.3fs",
 352                    ccm_interval_base[ccm_interval],
 353                    ccm_interval_base[ccm_interval] * CCM_INTERVAL_MIN_MULTIPLIER,
 354                    ccm_interval_base[ccm_interval] * CCM_INTERVAL_MAX_MULTIPLIER));
 355         }
 356
 357         ND_PRINT((ndo, "\n\t  Sequence Number 0x%08x, MA-End-Point-ID 0x%04x",
 358                EXTRACT_32BITS(msg_ptr.cfm_ccm->sequence),
 359                EXTRACT_16BITS(msg_ptr.cfm_ccm->ma_epi)));
 360
 361
 362         /*
 363          * Resolve the MD fields.
 364          */
 365         ND_PRINT((ndo, "\n\t  MD Name Format %s (%u), MD Name length %u",
 366                tok2str(cfm_md_nameformat_values, "Unknown",
 367                        msg_ptr.cfm_ccm->md_nameformat),
 368                msg_ptr.cfm_ccm->md_nameformat,
 369                msg_ptr.cfm_ccm->md_namelength));
 370
 371         if (msg_ptr.cfm_ccm->md_nameformat != CFM_CCM_MD_FORMAT_NONE) {
 372             ND_PRINT((ndo, "\n\t  MD Name: "));
 373             switch (msg_ptr.cfm_ccm->md_nameformat) {
 374             case CFM_CCM_MD_FORMAT_DNS:
 375             case CFM_CCM_MD_FORMAT_CHAR:
 376                 safeputs(ndo, msg_ptr.cfm_ccm->md_name, msg_ptr.cfm_ccm->md_namelength);
 377                 break;
 378
 379             case CFM_CCM_MD_FORMAT_MAC:
 380                 ND_PRINT((ndo, "\n\t  MAC %s", etheraddr_string(ndo,
 381                            msg_ptr.cfm_ccm->md_name)));
 382                 break;
 383
 384                 /* FIXME add printers for those MD formats - hexdump for now */
 385             case CFM_CCM_MA_FORMAT_8021:
 386             default:
 387                 print_unknown_data(ndo, msg_ptr.cfm_ccm->md_name, "\n\t    ",
 388                                    msg_ptr.cfm_ccm->md_namelength);
 389             }
 390         }
 391
 392
 393         /*
 394          * Resolve the MA fields.
 395          */
 396         ma_nameformat = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength;
 397         ma_namelength = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength + 1;
 398         ma_name = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength + 2;
 399
 400         ND_PRINT((ndo, "\n\t  MA Name-Format %s (%u), MA name length %u",
 401                tok2str(cfm_ma_nameformat_values, "Unknown",
 402                        *ma_nameformat),
 403                *ma_nameformat,
 404                *ma_namelength));
 405
 406         ND_PRINT((ndo, "\n\t  MA Name: "));
 407         switch (*ma_nameformat) {
 408         case CFM_CCM_MA_FORMAT_CHAR:
 409             safeputs(ndo, ma_name, *ma_namelength);
 410             break;
 411
 412             /* FIXME add printers for those MA formats - hexdump for now */
 413         case CFM_CCM_MA_FORMAT_8021:
 414         case CFM_CCM_MA_FORMAT_VID:
 415         case CFM_CCM_MA_FORMAT_INT:
 416         case CFM_CCM_MA_FORMAT_VPN:
 417         default:
 418             print_unknown_data(ndo, ma_name, "\n\t    ", *ma_namelength);
 419         }
 420         break;
 421
 422     case CFM_OPCODE_LTM:
 423         msg_ptr.cfm_ltm = (const struct cfm_ltm_t *)tptr;
 424
 425         ND_PRINT((ndo, ", Flags [%s]",
 426                bittok2str(cfm_ltm_flag_values, "none", cfm_common_header->flags)));
 427
 428         ND_PRINT((ndo, "\n\t  Transaction-ID 0x%08x, Egress-ID %s, ttl %u",
 429                EXTRACT_32BITS(msg_ptr.cfm_ltm->transaction_id),
 430                cfm_egress_id_string(ndo, msg_ptr.cfm_ltm->egress_id),
 431                msg_ptr.cfm_ltm->ttl));
 432
 433         ND_PRINT((ndo, "\n\t  Original-MAC %s, Target-MAC %s",
 434                etheraddr_string(ndo, msg_ptr.cfm_ltm->original_mac),
 435                etheraddr_string(ndo, msg_ptr.cfm_ltm->target_mac)));
 436         break;
 437
 438     case CFM_OPCODE_LTR:
 439         msg_ptr.cfm_ltr = (const struct cfm_ltr_t *)tptr;
 440
 441         ND_PRINT((ndo, ", Flags [%s]",
 442                bittok2str(cfm_ltr_flag_values, "none", cfm_common_header->flags)));
 443
 444         ND_PRINT((ndo, "\n\t  Transaction-ID 0x%08x, Last-Egress-ID %s",
 445                EXTRACT_32BITS(msg_ptr.cfm_ltr->transaction_id),
 446                cfm_egress_id_string(ndo, msg_ptr.cfm_ltr->last_egress_id)));
 447
 448         ND_PRINT((ndo, "\n\t  Next-Egress-ID %s, ttl %u",
 449                cfm_egress_id_string(ndo, msg_ptr.cfm_ltr->next_egress_id),
 450                msg_ptr.cfm_ltr->ttl));
 451
 452         ND_PRINT((ndo, "\n\t  Replay-Action %s (%u)",
 453                tok2str(cfm_ltr_replay_action_values,
 454                        "Unknown",
 455                        msg_ptr.cfm_ltr->replay_action),
 456                msg_ptr.cfm_ltr->replay_action));
 457         break;
 458
 459         /*
 460          * No message decoder yet.
 461          * Hexdump everything up until the start of the TLVs
 462          */
 463     case CFM_OPCODE_LBR:
 464     case CFM_OPCODE_LBM:
 465     default:
 466         if (tlen > cfm_common_header->first_tlv_offset) {
 467             print_unknown_data(ndo, tptr, "\n\t  ",
 468                                tlen -  cfm_common_header->first_tlv_offset);
 469         }
 470         break;
 471     }
 472
 473     /*
 474      * Sanity check for not walking off.
 475      */
 476     if (tlen <= cfm_common_header->first_tlv_offset) {
 477         return;
 478     }
 479
 480     tptr += cfm_common_header->first_tlv_offset;
 481     tlen -= cfm_common_header->first_tlv_offset;
 482
 483     while (tlen > 0) {
 484         cfm_tlv_header = (const struct cfm_tlv_header_t *)tptr;
 485
 486         /* Enough to read the tlv type ? */
 487         ND_TCHECK2(*tptr, 1);
 488         cfm_tlv_type=cfm_tlv_header->type;
 489
 490         if (cfm_tlv_type != CFM_TLV_END) {
 491             /* did we capture enough for fully decoding the object header ? */
 492             ND_TCHECK2(*tptr, sizeof(struct cfm_tlv_header_t));
 493             cfm_tlv_len=EXTRACT_16BITS(&cfm_tlv_header->length);
 494         } else {
 495             cfm_tlv_len = 0;
 496         }
 497
 498         ND_PRINT((ndo, "\n\t%s TLV (0x%02x), length %u",
 499                tok2str(cfm_tlv_values, "Unknown", cfm_tlv_type),
 500                cfm_tlv_type,
 501                cfm_tlv_len));
 502
 503         /* sanity check for not walking off and infinite loop check. */
 504         if ((cfm_tlv_type != CFM_TLV_END) &&
 505             ((cfm_tlv_len + sizeof(struct cfm_tlv_header_t) > tlen) ||
 506              (!cfm_tlv_len))) {
 507             print_unknown_data(ndo, tptr, "\n\t  ", tlen);
 508             return;
 509         }
 510
 511         tptr += sizeof(struct cfm_tlv_header_t);
 512         tlen -= sizeof(struct cfm_tlv_header_t);
 513         tlv_ptr = tptr;
 514
 515         /* did we capture enough for fully decoding the object ? */
 516         if (cfm_tlv_type != CFM_TLV_END) {
 517             ND_TCHECK2(*tptr, cfm_tlv_len);
 518         }
 519         hexdump = FALSE;
 520
 521         switch(cfm_tlv_type) {
 522         case CFM_TLV_END:
 523             /* we are done - bail out */
 524             return;
 525
 526         case CFM_TLV_PORT_STATUS:
 527             ND_PRINT((ndo, ", Status: %s (%u)",
 528                    tok2str(cfm_tlv_port_status_values, "Unknown", *tptr),
 529                    *tptr));
 530             break;
 531
 532         case CFM_TLV_INTERFACE_STATUS:
 533             ND_PRINT((ndo, ", Status: %s (%u)",
 534                    tok2str(cfm_tlv_interface_status_values, "Unknown", *tptr),
 535                    *tptr));
 536             break;
 537
 538         case CFM_TLV_PRIVATE:
 539             ND_PRINT((ndo, ", Vendor: %s (%u), Sub-Type %u",
 540                    tok2str(oui_values,"Unknown", EXTRACT_24BITS(tptr)),
 541                    EXTRACT_24BITS(tptr),
 542                    *(tptr + 3)));
 543             hexdump = TRUE;
 544             break;
 545
 546         case CFM_TLV_SENDER_ID:
 547         {
 548             u_int chassis_id_type, chassis_id_length;
 549             u_int mgmt_addr_length;
 550
 551             /*
 552              * Check if there is a Chassis-ID.
 553              */
 554             chassis_id_length = *tptr;
 555             if (chassis_id_length > tlen) {
 556                 hexdump = TRUE;
 557                 break;
 558             }
 559
 560             tptr++;
 561             tlen--;
 562
 563             if (chassis_id_length) {
 564                 chassis_id_type = *tptr;
 565                 ND_PRINT((ndo, "\n\t  Chassis-ID Type %s (%u), Chassis-ID length %u",
 566                        tok2str(cfm_tlv_senderid_chassisid_values,
 567                                "Unknown",
 568                                chassis_id_type),
 569                        chassis_id_type,
 570                        chassis_id_length));
 571
 572                 switch (chassis_id_type) {
 573                 case CFM_CHASSIS_ID_MAC_ADDRESS:
 574                     ND_PRINT((ndo, "\n\t  MAC %s", etheraddr_string(ndo, tptr + 1)));
 575                     break;
 576
 577                 case CFM_CHASSIS_ID_NETWORK_ADDRESS:
 578                     hexdump |= cfm_mgmt_addr_print(ndo, tptr);
 579                     break;
 580
 581                 case CFM_CHASSIS_ID_INTERFACE_NAME: /* fall through */
 582                 case CFM_CHASSIS_ID_INTERFACE_ALIAS:
 583                 case CFM_CHASSIS_ID_LOCAL:
 584                 case CFM_CHASSIS_ID_CHASSIS_COMPONENT:
 585                 case CFM_CHASSIS_ID_PORT_COMPONENT:
 586                     safeputs(ndo, tptr + 1, chassis_id_length);
 587                     break;
 588
 589                 default:
 590                     hexdump = TRUE;
 591                     break;
 592                 }
 593             }
 594
 595             tptr += chassis_id_length;
 596             tlen -= chassis_id_length;
 597
 598             /*
 599              * Check if there is a Management Address.
 600              */
 601             mgmt_addr_length = *tptr;
 602             if (mgmt_addr_length > tlen) {
 603                 hexdump = TRUE;
 604                 break;
 605             }
 606
 607             tptr++;
 608             tlen--;
 609
 610             if (mgmt_addr_length) {
 611                 hexdump |= cfm_mgmt_addr_print(ndo, tptr);
 612             }
 613
 614             tptr += mgmt_addr_length;
 615             tlen -= mgmt_addr_length;
 616
 617         }
 618         break;
 619
 620             /*
 621              * FIXME those are the defined TLVs that lack a decoder
 622              * you are welcome to contribute code ;-)
 623              */
 624
 625         case CFM_TLV_DATA:
 626         case CFM_TLV_REPLY_INGRESS:
 627         case CFM_TLV_REPLY_EGRESS:
 628         default:
 629             hexdump = TRUE;
 630             break;
 631         }
 632         /* do we want to see an additional hexdump ? */
 633         if (hexdump || ndo->ndo_vflag > 1)
 634             print_unknown_data(ndo, tlv_ptr, "\n\t  ", cfm_tlv_len);
 635
 636         tptr+=cfm_tlv_len;
 637         tlen-=cfm_tlv_len;
 638     }
 639     return;
 640 trunc:
 641     ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
 642 }