The Tcpdump Group git mirrors - tcpdump/blob - print-slow.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 "slow protocols" LACP, MARKER as per 802.3ad
  16  *                                       OAM as per 802.3ah
  17  *
  18  * Original code by Hannes Gredler (hannes@juniper.net)
  19  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25 #include <tcpdump-stdinc.h>
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30
  31 #include "interface.h"
  32 #include "extract.h"
  33 #include "addrtoname.h"
  34 #include "ether.h"
  35 #include "oui.h"
  36
  37 struct slow_common_header_t {
  38     u_int8_t proto_subtype;
  39     u_int8_t version;
  40 };
  41
  42 #define SLOW_PROTO_LACP                     1
  43 #define SLOW_PROTO_MARKER                   2
  44 #define SLOW_PROTO_OAM                      3
  45
  46 #define LACP_VERSION                        1
  47 #define MARKER_VERSION                      1
  48
  49 static const struct tok slow_proto_values[] = {
  50     { SLOW_PROTO_LACP, "LACP" },
  51     { SLOW_PROTO_MARKER, "MARKER" },
  52     { SLOW_PROTO_OAM, "OAM" },
  53     { 0, NULL}
  54 };
  55
  56 static const struct tok slow_oam_flag_values[] = {
  57     { 0x0001, "Link Fault" },
  58     { 0x0002, "Dying Gasp" },
  59     { 0x0004, "Critical Event" },
  60     { 0x0008, "Local Evaluating" },
  61     { 0x0010, "Local Stable" },
  62     { 0x0020, "Remote Evaluating" },
  63     { 0x0040, "Remote Stable" },
  64     { 0, NULL}
  65 };
  66
  67 #define SLOW_OAM_CODE_INFO          0x00
  68 #define SLOW_OAM_CODE_EVENT_NOTIF   0x01
  69 #define SLOW_OAM_CODE_VAR_REQUEST   0x02
  70 #define SLOW_OAM_CODE_VAR_RESPONSE  0x03
  71 #define SLOW_OAM_CODE_LOOPBACK_CTRL 0x04
  72 #define SLOW_OAM_CODE_PRIVATE       0xfe
  73
  74 static const struct tok slow_oam_code_values[] = {
  75     { SLOW_OAM_CODE_INFO, "Information" },
  76     { SLOW_OAM_CODE_EVENT_NOTIF, "Event Notification" },
  77     { SLOW_OAM_CODE_VAR_REQUEST, "Variable Request" },
  78     { SLOW_OAM_CODE_VAR_RESPONSE, "Variable Response" },
  79     { SLOW_OAM_CODE_LOOPBACK_CTRL, "Loopback Control" },
  80     { SLOW_OAM_CODE_PRIVATE, "Vendor Private" },
  81     { 0, NULL}
  82 };
  83
  84 struct slow_oam_info_t {
  85     u_int8_t info_type;
  86     u_int8_t info_length;
  87     u_int8_t oam_version;
  88     u_int8_t revision[2];
  89     u_int8_t state;
  90     u_int8_t oam_config;
  91     u_int8_t oam_pdu_config[2];
  92     u_int8_t oui[3];
  93     u_int8_t vendor_private[4];
  94 };
  95
  96 #define SLOW_OAM_INFO_TYPE_END_OF_TLV 0x00
  97 #define SLOW_OAM_INFO_TYPE_LOCAL 0x01
  98 #define SLOW_OAM_INFO_TYPE_REMOTE 0x02
  99 #define SLOW_OAM_INFO_TYPE_ORG_SPECIFIC 0xfe
 100
 101 static const struct tok slow_oam_info_type_values[] = {
 102     { SLOW_OAM_INFO_TYPE_END_OF_TLV, "End of TLV marker" },
 103     { SLOW_OAM_INFO_TYPE_LOCAL, "Local" },
 104     { SLOW_OAM_INFO_TYPE_REMOTE, "Remote" },
 105     { SLOW_OAM_INFO_TYPE_ORG_SPECIFIC, "Organization specific" },
 106     { 0, NULL}
 107 };
 108
 109 #define OAM_INFO_TYPE_PARSER_MASK 0x3
 110 static const struct tok slow_oam_info_type_state_parser_values[] = {
 111     { 0x00, "forwarding" },
 112     { 0x01, "looping back" },
 113     { 0x02, "discarding" },
 114     { 0x03, "reserved" },
 115     { 0, NULL}
 116 };
 117
 118 #define OAM_INFO_TYPE_MUX_MASK 0x4
 119 static const struct tok slow_oam_info_type_state_mux_values[] = {
 120     { 0x00, "forwarding" },
 121     { 0x04, "discarding" },
 122     { 0, NULL}
 123 };
 124
 125 static const struct tok slow_oam_info_type_oam_config_values[] = {
 126     { 0x01, "Active" },
 127     { 0x02, "Unidirectional" },
 128     { 0x04, "Remote-Loopback" },
 129     { 0x08, "Link-Events" },
 130     { 0x10, "Variable-Retrieval" },
 131     { 0, NULL}
 132 };
 133
 134 /* 11 Bits */
 135 #define OAM_INFO_TYPE_PDU_SIZE_MASK 0x7ff
 136
 137 #define SLOW_OAM_LINK_EVENT_END_OF_TLV 0x00
 138 #define SLOW_OAM_LINK_EVENT_ERR_SYM_PER 0x01
 139 #define SLOW_OAM_LINK_EVENT_ERR_FRM 0x02
 140 #define SLOW_OAM_LINK_EVENT_ERR_FRM_PER 0x03
 141 #define SLOW_OAM_LINK_EVENT_ERR_FRM_SUMM 0x04
 142 #define SLOW_OAM_LINK_EVENT_ORG_SPECIFIC 0xfe
 143
 144 static const struct tok slow_oam_link_event_values[] = {
 145     { SLOW_OAM_LINK_EVENT_END_OF_TLV, "End of TLV marker" },
 146     { SLOW_OAM_LINK_EVENT_ERR_SYM_PER, "Errored Symbol Period Event" },
 147     { SLOW_OAM_LINK_EVENT_ERR_FRM, "Errored Frame Event" },
 148     { SLOW_OAM_LINK_EVENT_ERR_FRM_PER, "Errored Frame Period Event" },
 149     { SLOW_OAM_LINK_EVENT_ERR_FRM_SUMM, "Errored Frame Seconds Summary Event" },
 150     { SLOW_OAM_LINK_EVENT_ORG_SPECIFIC, "Organization specific" },
 151     { 0, NULL}
 152 };
 153
 154 struct slow_oam_link_event_t {
 155     u_int8_t event_type;
 156     u_int8_t event_length;
 157     u_int8_t time_stamp[2];
 158     u_int8_t window[8];
 159     u_int8_t threshold[8];
 160     u_int8_t errors[8];
 161     u_int8_t errors_running_total[8];
 162     u_int8_t event_running_total[4];
 163 };
 164
 165 struct slow_oam_variablerequest_t {
 166     u_int8_t branch;
 167     u_int8_t leaf[2];
 168 };
 169
 170 struct slow_oam_variableresponse_t {
 171     u_int8_t branch;
 172     u_int8_t leaf[2];
 173     u_int8_t length;
 174 };
 175
 176 struct slow_oam_loopbackctrl_t {
 177     u_int8_t command;
 178 };
 179
 180 static const struct tok slow_oam_loopbackctrl_cmd_values[] = {
 181     { 0x01, "Enable OAM Remote Loopback" },
 182     { 0x02, "Disable OAM Remote Loopback" },
 183     { 0, NULL}
 184 };
 185
 186 struct tlv_header_t {
 187     u_int8_t type;
 188     u_int8_t length;
 189 };
 190
 191 #define LACP_TLV_TERMINATOR     0x00
 192 #define LACP_TLV_ACTOR_INFO     0x01
 193 #define LACP_TLV_PARTNER_INFO   0x02
 194 #define LACP_TLV_COLLECTOR_INFO 0x03
 195
 196 #define MARKER_TLV_TERMINATOR   0x00
 197 #define MARKER_TLV_MARKER_INFO  0x01
 198
 199 static const struct tok slow_tlv_values[] = {
 200     { (SLOW_PROTO_LACP << 8) + LACP_TLV_TERMINATOR, "Terminator"},
 201     { (SLOW_PROTO_LACP << 8) + LACP_TLV_ACTOR_INFO, "Actor Information"},
 202     { (SLOW_PROTO_LACP << 8) + LACP_TLV_PARTNER_INFO, "Partner Information"},
 203     { (SLOW_PROTO_LACP << 8) + LACP_TLV_COLLECTOR_INFO, "Collector Information"},
 204
 205     { (SLOW_PROTO_MARKER << 8) + MARKER_TLV_TERMINATOR, "Terminator"},
 206     { (SLOW_PROTO_MARKER << 8) + MARKER_TLV_MARKER_INFO, "Marker Information"},
 207     { 0, NULL}
 208 };
 209
 210 struct lacp_tlv_actor_partner_info_t {
 211     u_int8_t sys_pri[2];
 212     u_int8_t sys[ETHER_ADDR_LEN];
 213     u_int8_t key[2];
 214     u_int8_t port_pri[2];
 215     u_int8_t port[2];
 216     u_int8_t state;
 217     u_int8_t pad[3];
 218 };
 219
 220 static const struct tok lacp_tlv_actor_partner_info_state_values[] = {
 221     { 0x01, "Activity"},
 222     { 0x02, "Timeout"},
 223     { 0x04, "Aggregation"},
 224     { 0x08, "Synchronization"},
 225     { 0x10, "Collecting"},
 226     { 0x20, "Distributing"},
 227     { 0x40, "Default"},
 228     { 0x80, "Expired"},
 229     { 0, NULL}
 230 };
 231
 232 struct lacp_tlv_collector_info_t {
 233     u_int8_t max_delay[2];
 234     u_int8_t pad[12];
 235 };
 236
 237 struct marker_tlv_marker_info_t {
 238     u_int8_t req_port[2];
 239     u_int8_t req_sys[ETHER_ADDR_LEN];
 240     u_int8_t req_trans_id[4];
 241     u_int8_t pad[2];
 242 };
 243
 244 struct lacp_marker_tlv_terminator_t {
 245     u_int8_t pad[50];
 246 };
 247
 248 void slow_marker_lacp_print(register const u_char *, register u_int);
 249 void slow_oam_print(register const u_char *, register u_int);
 250
 251 const struct slow_common_header_t *slow_com_header;
 252
 253 void
 254 slow_print(register const u_char *pptr, register u_int len) {
 255
 256     int print_version;
 257
 258     slow_com_header = (const struct slow_common_header_t *)pptr;
 259     TCHECK(*slow_com_header);
 260
 261     /*
 262      * Sanity checking of the header.
 263      */
 264     switch (slow_com_header->proto_subtype) {
 265     case SLOW_PROTO_LACP:
 266         if (slow_com_header->version != LACP_VERSION) {
 267             printf("LACP version %u packet not supported",slow_com_header->version);
 268             return;
 269         }
 270         print_version = 1;
 271         break;
 272
 273     case SLOW_PROTO_MARKER:
 274         if (slow_com_header->version != MARKER_VERSION) {
 275             printf("MARKER version %u packet not supported",slow_com_header->version);
 276             return;
 277         }
 278         print_version = 1;
 279         break;
 280
 281     case SLOW_PROTO_OAM: /* fall through */
 282         print_version = 0;
 283         break;
 284
 285     default:
 286         /* print basic information and exit */
 287         print_version = -1;
 288         break;
 289     }
 290
 291     if (print_version) {
 292         printf("%sv%u, length %u",
 293                tok2str(slow_proto_values, "unknown (%u)",slow_com_header->proto_subtype),
 294                slow_com_header->version,
 295                len);
 296     } else {
 297         /* some slow protos don't have a version number in the header */
 298         printf("%s, length %u",
 299                tok2str(slow_proto_values, "unknown (%u)",slow_com_header->proto_subtype),
 300                len);
 301     }
 302
 303     /* unrecognized subtype */
 304     if (print_version == -1) {
 305         print_unknown_data(gndo,pptr, "\n\t", len);
 306         return;
 307     }
 308
 309     if (!vflag)
 310         return;
 311
 312     switch (slow_com_header->proto_subtype) {
 313     default: /* should not happen */
 314         break;
 315
 316     case SLOW_PROTO_OAM:
 317         /* skip proto_subtype */
 318         slow_oam_print(pptr+1, len-1);
 319         break;
 320
 321     case SLOW_PROTO_LACP:   /* LACP and MARKER share the same semantics */
 322     case SLOW_PROTO_MARKER:
 323         /* skip slow_common_header */
 324         len -= sizeof(const struct slow_common_header_t);
 325         pptr += sizeof(const struct slow_common_header_t);
 326         slow_marker_lacp_print(pptr, len);
 327         break;
 328     }
 329     return;
 330
 331 trunc:
 332     printf("\n\t\t packet exceeded snapshot");
 333 }
 334
 335 void slow_marker_lacp_print(register const u_char *tptr, register u_int tlen) {
 336
 337     const struct tlv_header_t *tlv_header;
 338     const u_char *tlv_tptr;
 339     u_int tlv_len, tlv_tlen;
 340
 341     union {
 342         const struct lacp_marker_tlv_terminator_t *lacp_marker_tlv_terminator;
 343         const struct lacp_tlv_actor_partner_info_t *lacp_tlv_actor_partner_info;
 344         const struct lacp_tlv_collector_info_t *lacp_tlv_collector_info;
 345         const struct marker_tlv_marker_info_t *marker_tlv_marker_info;
 346     } tlv_ptr;
 347
 348     while(tlen>0) {
 349         /* did we capture enough for fully decoding the tlv header ? */
 350         TCHECK2(*tptr, sizeof(struct tlv_header_t));
 351         tlv_header = (const struct tlv_header_t *)tptr;
 352         tlv_len = tlv_header->length;
 353
 354         printf("\n\t%s TLV (0x%02x), length %u",
 355                tok2str(slow_tlv_values,
 356                        "Unknown",
 357                        (slow_com_header->proto_subtype << 8) + tlv_header->type),
 358                tlv_header->type,
 359                tlv_len);
 360
 361         if ((tlv_len < sizeof(struct tlv_header_t) ||
 362             tlv_len > tlen) &&
 363             tlv_header->type != LACP_TLV_TERMINATOR &&
 364             tlv_header->type != MARKER_TLV_TERMINATOR) {
 365             printf("\n\t-----trailing data-----");
 366             print_unknown_data(gndo,tptr+sizeof(struct tlv_header_t),"\n\t  ",tlen);
 367             return;
 368         }
 369
 370         tlv_tptr=tptr+sizeof(struct tlv_header_t);
 371         tlv_tlen=tlv_len-sizeof(struct tlv_header_t);
 372
 373         /* did we capture enough for fully decoding the tlv ? */
 374         TCHECK2(*tptr, tlv_len);
 375
 376         switch((slow_com_header->proto_subtype << 8) + tlv_header->type) {
 377
 378             /* those two TLVs have the same structure -> fall through */
 379         case ((SLOW_PROTO_LACP << 8) + LACP_TLV_ACTOR_INFO):
 380         case ((SLOW_PROTO_LACP << 8) + LACP_TLV_PARTNER_INFO):
 381             tlv_ptr.lacp_tlv_actor_partner_info = (const struct lacp_tlv_actor_partner_info_t *)tlv_tptr;
 382
 383             printf("\n\t  System %s, System Priority %u, Key %u" \
 384                    ", Port %u, Port Priority %u\n\t  State Flags [%s]",
 385                    etheraddr_string(tlv_ptr.lacp_tlv_actor_partner_info->sys),
 386                    EXTRACT_16BITS(tlv_ptr.lacp_tlv_actor_partner_info->sys_pri),
 387                    EXTRACT_16BITS(tlv_ptr.lacp_tlv_actor_partner_info->key),
 388                    EXTRACT_16BITS(tlv_ptr.lacp_tlv_actor_partner_info->port),
 389                    EXTRACT_16BITS(tlv_ptr.lacp_tlv_actor_partner_info->port_pri),
 390                    bittok2str(lacp_tlv_actor_partner_info_state_values,
 391                               "none",
 392                               tlv_ptr.lacp_tlv_actor_partner_info->state));
 393
 394             break;
 395
 396         case ((SLOW_PROTO_LACP << 8) + LACP_TLV_COLLECTOR_INFO):
 397             tlv_ptr.lacp_tlv_collector_info = (const struct lacp_tlv_collector_info_t *)tlv_tptr;
 398
 399             printf("\n\t  Max Delay %u",
 400                    EXTRACT_16BITS(tlv_ptr.lacp_tlv_collector_info->max_delay));
 401
 402             break;
 403
 404         case ((SLOW_PROTO_MARKER << 8) + MARKER_TLV_MARKER_INFO):
 405             tlv_ptr.marker_tlv_marker_info = (const struct marker_tlv_marker_info_t *)tlv_tptr;
 406
 407             printf("\n\t  Request System %s, Request Port %u, Request Transaction ID 0x%08x",
 408                    etheraddr_string(tlv_ptr.marker_tlv_marker_info->req_sys),
 409                    EXTRACT_16BITS(tlv_ptr.marker_tlv_marker_info->req_port),
 410                    EXTRACT_32BITS(tlv_ptr.marker_tlv_marker_info->req_trans_id));
 411
 412             break;
 413
 414             /* those two TLVs have the same structure -> fall through */
 415         case ((SLOW_PROTO_LACP << 8) + LACP_TLV_TERMINATOR):
 416         case ((SLOW_PROTO_MARKER << 8) + LACP_TLV_TERMINATOR):
 417             tlv_ptr.lacp_marker_tlv_terminator = (const struct lacp_marker_tlv_terminator_t *)tlv_tptr;
 418             if (tlv_len == 0) {
 419                 tlv_len = sizeof(tlv_ptr.lacp_marker_tlv_terminator->pad) +
 420                     sizeof(struct tlv_header_t);
 421                 /* tell the user that we modified the length field  */
 422                 if (vflag>1)
 423                     printf(" (=%u)",tlv_len);
 424                 /* we have messed around with the length field - now we need to check
 425                  * again if there are enough bytes on the wire for the hexdump */
 426                 TCHECK2(tlv_ptr.lacp_marker_tlv_terminator->pad[0],
 427                         sizeof(tlv_ptr.lacp_marker_tlv_terminator->pad));
 428             }
 429
 430             break;
 431
 432         default:
 433             if (vflag <= 1)
 434                 print_unknown_data(gndo,tlv_tptr,"\n\t  ",tlv_tlen);
 435             break;
 436         }
 437         /* do we want to see an additional hexdump ? */
 438         if (vflag > 1) {
 439             print_unknown_data(gndo,tptr+sizeof(struct tlv_header_t),"\n\t  ",
 440                                tlv_len-sizeof(struct tlv_header_t));
 441         }
 442
 443         tptr+=tlv_len;
 444         tlen-=tlv_len;
 445     }
 446     return;
 447 trunc:
 448     printf("\n\t\t packet exceeded snapshot");
 449 }
 450
 451 void slow_oam_print(register const u_char *tptr, register u_int tlen) {
 452
 453     u_int hexdump;
 454
 455     struct slow_oam_common_header_t {
 456         u_int8_t flags[2];
 457         u_int8_t code;
 458     };
 459
 460     struct slow_oam_tlv_header_t {
 461         u_int8_t type;
 462         u_int8_t length;
 463     };
 464
 465     union {
 466         const struct slow_oam_common_header_t *slow_oam_common_header;
 467         const struct slow_oam_tlv_header_t *slow_oam_tlv_header;
 468     } ptr;
 469
 470     union {
 471         const struct slow_oam_info_t *slow_oam_info;
 472         const struct slow_oam_link_event_t *slow_oam_link_event;
 473         const struct slow_oam_variablerequest_t *slow_oam_variablerequest;
 474         const struct slow_oam_variableresponse_t *slow_oam_variableresponse;
 475         const struct slow_oam_loopbackctrl_t *slow_oam_loopbackctrl;
 476     } tlv;
 477
 478     ptr.slow_oam_common_header = (struct slow_oam_common_header_t *)tptr;
 479     tptr += sizeof(struct slow_oam_common_header_t);
 480     tlen -= sizeof(struct slow_oam_common_header_t);
 481
 482     printf("\n\tCode %s OAM PDU, Flags [%s]",
 483            tok2str(slow_oam_code_values, "Unknown (%u)", ptr.slow_oam_common_header->code),
 484            bittok2str(slow_oam_flag_values,
 485                       "none",
 486                       EXTRACT_16BITS(&ptr.slow_oam_common_header->flags)));
 487
 488     switch (ptr.slow_oam_common_header->code) {
 489     case SLOW_OAM_CODE_INFO:
 490         while (tlen > 0) {
 491             ptr.slow_oam_tlv_header = (const struct slow_oam_tlv_header_t *)tptr;
 492             printf("\n\t  %s Information Type (%u), length %u",
 493                    tok2str(slow_oam_info_type_values, "Reserved",
 494                            ptr.slow_oam_tlv_header->type),
 495                    ptr.slow_oam_tlv_header->type,
 496                    ptr.slow_oam_tlv_header->length);
 497
 498             hexdump = FALSE;
 499             switch (ptr.slow_oam_tlv_header->type) {
 500             case SLOW_OAM_INFO_TYPE_END_OF_TLV:
 501                 if (ptr.slow_oam_tlv_header->length != 0) {
 502                     printf("\n\t    ERROR: illegal length - should be 0");
 503                 }
 504                 return;
 505
 506             case SLOW_OAM_INFO_TYPE_LOCAL: /* identical format - fall through */
 507             case SLOW_OAM_INFO_TYPE_REMOTE:
 508                 tlv.slow_oam_info = (const struct slow_oam_info_t *)tptr;
 509
 510                 if (tlv.slow_oam_info->info_length !=
 511                     sizeof(struct slow_oam_info_t)) {
 512                     printf("\n\t    ERROR: illegal length - should be %lu",
 513                            (unsigned long) sizeof(struct slow_oam_info_t));
 514                     return;
 515                 }
 516
 517                 printf("\n\t    OAM-Version %u, Revision %u",
 518                        tlv.slow_oam_info->oam_version,
 519                        EXTRACT_16BITS(&tlv.slow_oam_info->revision));
 520
 521                 printf("\n\t    State-Parser-Action %s, State-MUX-Action %s",
 522                        tok2str(slow_oam_info_type_state_parser_values, "Reserved",
 523                                tlv.slow_oam_info->state & OAM_INFO_TYPE_PARSER_MASK),
 524                        tok2str(slow_oam_info_type_state_mux_values, "Reserved",
 525                                tlv.slow_oam_info->state & OAM_INFO_TYPE_MUX_MASK));
 526                 printf("\n\t    OAM-Config Flags [%s], OAM-PDU-Config max-PDU size %u",
 527                        bittok2str(slow_oam_info_type_oam_config_values, "none",
 528                                   tlv.slow_oam_info->oam_config),
 529                        EXTRACT_16BITS(&tlv.slow_oam_info->oam_pdu_config) &
 530                        OAM_INFO_TYPE_PDU_SIZE_MASK);
 531                 printf("\n\t    OUI %s (0x%06x), Vendor-Private 0x%08x",
 532                        tok2str(oui_values, "Unknown",
 533                                EXTRACT_24BITS(&tlv.slow_oam_info->oui)),
 534                        EXTRACT_24BITS(&tlv.slow_oam_info->oui),
 535                        EXTRACT_32BITS(&tlv.slow_oam_info->vendor_private));
 536                 break;
 537
 538             case SLOW_OAM_INFO_TYPE_ORG_SPECIFIC:
 539                 hexdump = TRUE;
 540                 break;
 541
 542             default:
 543                 hexdump = TRUE;
 544                 break;
 545             }
 546
 547             /* infinite loop check */
 548             if (!ptr.slow_oam_tlv_header->length) {
 549                 return;
 550             }
 551
 552             /* do we also want to see a hex dump ? */
 553             if (vflag > 1 || hexdump==TRUE) {
 554                 print_unknown_data(gndo,tptr,"\n\t  ",
 555                                    ptr.slow_oam_tlv_header->length);
 556             }
 557
 558             tlen -= ptr.slow_oam_tlv_header->length;
 559             tptr += ptr.slow_oam_tlv_header->length;
 560         }
 561         break;
 562
 563     case SLOW_OAM_CODE_EVENT_NOTIF:
 564         while (tlen > 0) {
 565             ptr.slow_oam_tlv_header = (const struct slow_oam_tlv_header_t *)tptr;
 566             printf("\n\t  %s Link Event Type (%u), length %u",
 567                    tok2str(slow_oam_link_event_values, "Reserved",
 568                            ptr.slow_oam_tlv_header->type),
 569                    ptr.slow_oam_tlv_header->type,
 570                    ptr.slow_oam_tlv_header->length);
 571
 572             hexdump = FALSE;
 573             switch (ptr.slow_oam_tlv_header->type) {
 574             case SLOW_OAM_LINK_EVENT_END_OF_TLV:
 575                 if (ptr.slow_oam_tlv_header->length != 0) {
 576                     printf("\n\t    ERROR: illegal length - should be 0");
 577                 }
 578                 return;
 579
 580             case SLOW_OAM_LINK_EVENT_ERR_SYM_PER: /* identical format - fall through */
 581             case SLOW_OAM_LINK_EVENT_ERR_FRM:
 582             case SLOW_OAM_LINK_EVENT_ERR_FRM_PER:
 583             case SLOW_OAM_LINK_EVENT_ERR_FRM_SUMM:
 584                 tlv.slow_oam_link_event = (const struct slow_oam_link_event_t *)tptr;
 585
 586                 if (tlv.slow_oam_link_event->event_length !=
 587                     sizeof(struct slow_oam_link_event_t)) {
 588                     printf("\n\t    ERROR: illegal length - should be %lu",
 589                            (unsigned long) sizeof(struct slow_oam_link_event_t));
 590                     return;
 591                 }
 592
 593                 printf("\n\t    Timestamp %u ms, Errored Window %" PRIu64
 594                        "\n\t    Errored Threshold %" PRIu64
 595                        "\n\t    Errors %" PRIu64
 596                        "\n\t    Error Running Total %" PRIu64
 597                        "\n\t    Event Running Total %u",
 598                        EXTRACT_16BITS(&tlv.slow_oam_link_event->time_stamp)*100,
 599                        EXTRACT_64BITS(&tlv.slow_oam_link_event->window),
 600                        EXTRACT_64BITS(&tlv.slow_oam_link_event->threshold),
 601                        EXTRACT_64BITS(&tlv.slow_oam_link_event->errors),
 602                        EXTRACT_64BITS(&tlv.slow_oam_link_event->errors_running_total),
 603                        EXTRACT_32BITS(&tlv.slow_oam_link_event->event_running_total));
 604                 break;
 605
 606             case SLOW_OAM_LINK_EVENT_ORG_SPECIFIC:
 607                 hexdump = TRUE;
 608                 break;
 609
 610             default:
 611                 hexdump = TRUE;
 612                 break;
 613             }
 614
 615             /* infinite loop check */
 616             if (!ptr.slow_oam_tlv_header->length) {
 617                 return;
 618             }
 619
 620             /* do we also want to see a hex dump ? */
 621             if (vflag > 1 || hexdump==TRUE) {
 622                 print_unknown_data(gndo,tptr,"\n\t  ",
 623                                    ptr.slow_oam_tlv_header->length);
 624             }
 625
 626             tlen -= ptr.slow_oam_tlv_header->length;
 627             tptr += ptr.slow_oam_tlv_header->length;
 628         }
 629         break;
 630
 631     case SLOW_OAM_CODE_LOOPBACK_CTRL:
 632         tlv.slow_oam_loopbackctrl = (const struct slow_oam_loopbackctrl_t *)tptr;
 633         printf("\n\t  Command %s (%u)",
 634                tok2str(slow_oam_loopbackctrl_cmd_values,
 635                        "Unknown",
 636                        tlv.slow_oam_loopbackctrl->command),
 637                tlv.slow_oam_loopbackctrl->command);
 638                tptr ++;
 639                tlen --;
 640         break;
 641
 642         /*
 643          * FIXME those are the defined codes that lack a decoder
 644          * you are welcome to contribute code ;-)
 645          */
 646     case SLOW_OAM_CODE_VAR_REQUEST:
 647     case SLOW_OAM_CODE_VAR_RESPONSE:
 648     case SLOW_OAM_CODE_PRIVATE:
 649     default:
 650         if (vflag <= 1) {
 651             print_unknown_data(gndo,tptr,"\n\t  ", tlen);
 652         }
 653         break;
 654     }
 655     return;
 656 }