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 #define NETDISSECT_REWORKED
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include <tcpdump-stdinc.h>
  27
  28 #include "interface.h"
  29 #include "extract.h"
  30 #include "addrtoname.h"
  31 #include "ether.h"
  32 #include "oui.h"
  33
  34 struct slow_common_header_t {
  35     uint8_t proto_subtype;
  36     uint8_t version;
  37 };
  38
  39 #define SLOW_PROTO_LACP                     1
  40 #define SLOW_PROTO_MARKER                   2
  41 #define SLOW_PROTO_OAM                      3
  42
  43 #define LACP_VERSION                        1
  44 #define MARKER_VERSION                      1
  45
  46 static const struct tok slow_proto_values[] = {
  47     { SLOW_PROTO_LACP, "LACP" },
  48     { SLOW_PROTO_MARKER, "MARKER" },
  49     { SLOW_PROTO_OAM, "OAM" },
  50     { 0, NULL}
  51 };
  52
  53 static const struct tok slow_oam_flag_values[] = {
  54     { 0x0001, "Link Fault" },
  55     { 0x0002, "Dying Gasp" },
  56     { 0x0004, "Critical Event" },
  57     { 0x0008, "Local Evaluating" },
  58     { 0x0010, "Local Stable" },
  59     { 0x0020, "Remote Evaluating" },
  60     { 0x0040, "Remote Stable" },
  61     { 0, NULL}
  62 };
  63
  64 #define SLOW_OAM_CODE_INFO          0x00
  65 #define SLOW_OAM_CODE_EVENT_NOTIF   0x01
  66 #define SLOW_OAM_CODE_VAR_REQUEST   0x02
  67 #define SLOW_OAM_CODE_VAR_RESPONSE  0x03
  68 #define SLOW_OAM_CODE_LOOPBACK_CTRL 0x04
  69 #define SLOW_OAM_CODE_PRIVATE       0xfe
  70
  71 static const struct tok slow_oam_code_values[] = {
  72     { SLOW_OAM_CODE_INFO, "Information" },
  73     { SLOW_OAM_CODE_EVENT_NOTIF, "Event Notification" },
  74     { SLOW_OAM_CODE_VAR_REQUEST, "Variable Request" },
  75     { SLOW_OAM_CODE_VAR_RESPONSE, "Variable Response" },
  76     { SLOW_OAM_CODE_LOOPBACK_CTRL, "Loopback Control" },
  77     { SLOW_OAM_CODE_PRIVATE, "Vendor Private" },
  78     { 0, NULL}
  79 };
  80
  81 struct slow_oam_info_t {
  82     uint8_t info_type;
  83     uint8_t info_length;
  84     uint8_t oam_version;
  85     uint8_t revision[2];
  86     uint8_t state;
  87     uint8_t oam_config;
  88     uint8_t oam_pdu_config[2];
  89     uint8_t oui[3];
  90     uint8_t vendor_private[4];
  91 };
  92
  93 #define SLOW_OAM_INFO_TYPE_END_OF_TLV 0x00
  94 #define SLOW_OAM_INFO_TYPE_LOCAL 0x01
  95 #define SLOW_OAM_INFO_TYPE_REMOTE 0x02
  96 #define SLOW_OAM_INFO_TYPE_ORG_SPECIFIC 0xfe
  97
  98 static const struct tok slow_oam_info_type_values[] = {
  99     { SLOW_OAM_INFO_TYPE_END_OF_TLV, "End of TLV marker" },
 100     { SLOW_OAM_INFO_TYPE_LOCAL, "Local" },
 101     { SLOW_OAM_INFO_TYPE_REMOTE, "Remote" },
 102     { SLOW_OAM_INFO_TYPE_ORG_SPECIFIC, "Organization specific" },
 103     { 0, NULL}
 104 };
 105
 106 #define OAM_INFO_TYPE_PARSER_MASK 0x3
 107 static const struct tok slow_oam_info_type_state_parser_values[] = {
 108     { 0x00, "forwarding" },
 109     { 0x01, "looping back" },
 110     { 0x02, "discarding" },
 111     { 0x03, "reserved" },
 112     { 0, NULL}
 113 };
 114
 115 #define OAM_INFO_TYPE_MUX_MASK 0x4
 116 static const struct tok slow_oam_info_type_state_mux_values[] = {
 117     { 0x00, "forwarding" },
 118     { 0x04, "discarding" },
 119     { 0, NULL}
 120 };
 121
 122 static const struct tok slow_oam_info_type_oam_config_values[] = {
 123     { 0x01, "Active" },
 124     { 0x02, "Unidirectional" },
 125     { 0x04, "Remote-Loopback" },
 126     { 0x08, "Link-Events" },
 127     { 0x10, "Variable-Retrieval" },
 128     { 0, NULL}
 129 };
 130
 131 /* 11 Bits */
 132 #define OAM_INFO_TYPE_PDU_SIZE_MASK 0x7ff
 133
 134 #define SLOW_OAM_LINK_EVENT_END_OF_TLV 0x00
 135 #define SLOW_OAM_LINK_EVENT_ERR_SYM_PER 0x01
 136 #define SLOW_OAM_LINK_EVENT_ERR_FRM 0x02
 137 #define SLOW_OAM_LINK_EVENT_ERR_FRM_PER 0x03
 138 #define SLOW_OAM_LINK_EVENT_ERR_FRM_SUMM 0x04
 139 #define SLOW_OAM_LINK_EVENT_ORG_SPECIFIC 0xfe
 140
 141 static const struct tok slow_oam_link_event_values[] = {
 142     { SLOW_OAM_LINK_EVENT_END_OF_TLV, "End of TLV marker" },
 143     { SLOW_OAM_LINK_EVENT_ERR_SYM_PER, "Errored Symbol Period Event" },
 144     { SLOW_OAM_LINK_EVENT_ERR_FRM, "Errored Frame Event" },
 145     { SLOW_OAM_LINK_EVENT_ERR_FRM_PER, "Errored Frame Period Event" },
 146     { SLOW_OAM_LINK_EVENT_ERR_FRM_SUMM, "Errored Frame Seconds Summary Event" },
 147     { SLOW_OAM_LINK_EVENT_ORG_SPECIFIC, "Organization specific" },
 148     { 0, NULL}
 149 };
 150
 151 struct slow_oam_link_event_t {
 152     uint8_t event_type;
 153     uint8_t event_length;
 154     uint8_t time_stamp[2];
 155     uint8_t window[8];
 156     uint8_t threshold[8];
 157     uint8_t errors[8];
 158     uint8_t errors_running_total[8];
 159     uint8_t event_running_total[4];
 160 };
 161
 162 struct slow_oam_variablerequest_t {
 163     uint8_t branch;
 164     uint8_t leaf[2];
 165 };
 166
 167 struct slow_oam_variableresponse_t {
 168     uint8_t branch;
 169     uint8_t leaf[2];
 170     uint8_t length;
 171 };
 172
 173 struct slow_oam_loopbackctrl_t {
 174     uint8_t command;
 175 };
 176
 177 static const struct tok slow_oam_loopbackctrl_cmd_values[] = {
 178     { 0x01, "Enable OAM Remote Loopback" },
 179     { 0x02, "Disable OAM Remote Loopback" },
 180     { 0, NULL}
 181 };
 182
 183 struct tlv_header_t {
 184     uint8_t type;
 185     uint8_t length;
 186 };
 187
 188 #define LACP_TLV_TERMINATOR     0x00
 189 #define LACP_TLV_ACTOR_INFO     0x01
 190 #define LACP_TLV_PARTNER_INFO   0x02
 191 #define LACP_TLV_COLLECTOR_INFO 0x03
 192
 193 #define MARKER_TLV_TERMINATOR   0x00
 194 #define MARKER_TLV_MARKER_INFO  0x01
 195
 196 static const struct tok slow_tlv_values[] = {
 197     { (SLOW_PROTO_LACP << 8) + LACP_TLV_TERMINATOR, "Terminator"},
 198     { (SLOW_PROTO_LACP << 8) + LACP_TLV_ACTOR_INFO, "Actor Information"},
 199     { (SLOW_PROTO_LACP << 8) + LACP_TLV_PARTNER_INFO, "Partner Information"},
 200     { (SLOW_PROTO_LACP << 8) + LACP_TLV_COLLECTOR_INFO, "Collector Information"},
 201
 202     { (SLOW_PROTO_MARKER << 8) + MARKER_TLV_TERMINATOR, "Terminator"},
 203     { (SLOW_PROTO_MARKER << 8) + MARKER_TLV_MARKER_INFO, "Marker Information"},
 204     { 0, NULL}
 205 };
 206
 207 struct lacp_tlv_actor_partner_info_t {
 208     uint8_t sys_pri[2];
 209     uint8_t sys[ETHER_ADDR_LEN];
 210     uint8_t key[2];
 211     uint8_t port_pri[2];
 212     uint8_t port[2];
 213     uint8_t state;
 214     uint8_t pad[3];
 215 };
 216
 217 static const struct tok lacp_tlv_actor_partner_info_state_values[] = {
 218     { 0x01, "Activity"},
 219     { 0x02, "Timeout"},
 220     { 0x04, "Aggregation"},
 221     { 0x08, "Synchronization"},
 222     { 0x10, "Collecting"},
 223     { 0x20, "Distributing"},
 224     { 0x40, "Default"},
 225     { 0x80, "Expired"},
 226     { 0, NULL}
 227 };
 228
 229 struct lacp_tlv_collector_info_t {
 230     uint8_t max_delay[2];
 231     uint8_t pad[12];
 232 };
 233
 234 struct marker_tlv_marker_info_t {
 235     uint8_t req_port[2];
 236     uint8_t req_sys[ETHER_ADDR_LEN];
 237     uint8_t req_trans_id[4];
 238     uint8_t pad[2];
 239 };
 240
 241 struct lacp_marker_tlv_terminator_t {
 242     uint8_t pad[50];
 243 };
 244
 245 static void slow_marker_lacp_print(netdissect_options *, register const u_char *, register u_int);
 246 static void slow_oam_print(netdissect_options *, register const u_char *, register u_int);
 247
 248 const struct slow_common_header_t *slow_com_header;
 249
 250 void
 251 slow_print(netdissect_options *ndo,
 252            register const u_char *pptr, register u_int len) {
 253
 254     int print_version;
 255
 256     slow_com_header = (const struct slow_common_header_t *)pptr;
 257     ND_TCHECK(*slow_com_header);
 258
 259     /*
 260      * Sanity checking of the header.
 261      */
 262     switch (slow_com_header->proto_subtype) {
 263     case SLOW_PROTO_LACP:
 264         if (slow_com_header->version != LACP_VERSION) {
 265             ND_PRINT((ndo, "LACP version %u packet not supported",slow_com_header->version));
 266             return;
 267         }
 268         print_version = 1;
 269         break;
 270
 271     case SLOW_PROTO_MARKER:
 272         if (slow_com_header->version != MARKER_VERSION) {
 273             ND_PRINT((ndo, "MARKER version %u packet not supported",slow_com_header->version));
 274             return;
 275         }
 276         print_version = 1;
 277         break;
 278
 279     case SLOW_PROTO_OAM: /* fall through */
 280         print_version = 0;
 281         break;
 282
 283     default:
 284         /* print basic information and exit */
 285         print_version = -1;
 286         break;
 287     }
 288
 289     if (print_version) {
 290         ND_PRINT((ndo, "%sv%u, length %u",
 291                tok2str(slow_proto_values, "unknown (%u)",slow_com_header->proto_subtype),
 292                slow_com_header->version,
 293                len));
 294     } else {
 295         /* some slow protos don't have a version number in the header */
 296         ND_PRINT((ndo, "%s, length %u",
 297                tok2str(slow_proto_values, "unknown (%u)",slow_com_header->proto_subtype),
 298                len));
 299     }
 300
 301     /* unrecognized subtype */
 302     if (print_version == -1) {
 303         print_unknown_data(ndo, pptr, "\n\t", len);
 304         return;
 305     }
 306
 307     if (!ndo->ndo_vflag)
 308         return;
 309
 310     switch (slow_com_header->proto_subtype) {
 311     default: /* should not happen */
 312         break;
 313
 314     case SLOW_PROTO_OAM:
 315         /* skip proto_subtype */
 316         slow_oam_print(ndo, pptr+1, len-1);
 317         break;
 318
 319     case SLOW_PROTO_LACP:   /* LACP and MARKER share the same semantics */
 320     case SLOW_PROTO_MARKER:
 321         /* skip slow_common_header */
 322         len -= sizeof(const struct slow_common_header_t);
 323         pptr += sizeof(const struct slow_common_header_t);
 324         slow_marker_lacp_print(ndo, pptr, len);
 325         break;
 326     }
 327     return;
 328
 329 trunc:
 330     ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
 331 }
 332
 333 static void
 334 slow_marker_lacp_print(netdissect_options *ndo,
 335                        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         ND_TCHECK2(*tptr, sizeof(struct tlv_header_t));
 351         tlv_header = (const struct tlv_header_t *)tptr;
 352         tlv_len = tlv_header->length;
 353
 354         ND_PRINT((ndo, "\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             ND_PRINT((ndo, "\n\t-----trailing data-----"));
 366             print_unknown_data(ndo, 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         ND_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             ND_PRINT((ndo, "\n\t  System %s, System Priority %u, Key %u" \
 384                    ", Port %u, Port Priority %u\n\t  State Flags [%s]",
 385                    etheraddr_string(ndo, 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             ND_PRINT((ndo, "\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             ND_PRINT((ndo, "\n\t  Request System %s, Request Port %u, Request Transaction ID 0x%08x",
 408                    etheraddr_string(ndo, 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 (ndo->ndo_vflag>1)
 423                     ND_PRINT((ndo, " (=%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                 ND_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 (ndo->ndo_vflag <= 1)
 434                 print_unknown_data(ndo, tlv_tptr, "\n\t  ", tlv_tlen);
 435             break;
 436         }
 437         /* do we want to see an additional hexdump ? */
 438         if (ndo->ndo_vflag > 1) {
 439             print_unknown_data(ndo, 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     ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
 449 }
 450
 451 static void
 452 slow_oam_print(netdissect_options *ndo,
 453                register const u_char *tptr, register u_int tlen) {
 454
 455     u_int hexdump;
 456
 457     struct slow_oam_common_header_t {
 458         uint8_t flags[2];
 459         uint8_t code;
 460     };
 461
 462     struct slow_oam_tlv_header_t {
 463         uint8_t type;
 464         uint8_t length;
 465     };
 466
 467     union {
 468         const struct slow_oam_common_header_t *slow_oam_common_header;
 469         const struct slow_oam_tlv_header_t *slow_oam_tlv_header;
 470     } ptr;
 471
 472     union {
 473         const struct slow_oam_info_t *slow_oam_info;
 474         const struct slow_oam_link_event_t *slow_oam_link_event;
 475         const struct slow_oam_variablerequest_t *slow_oam_variablerequest;
 476         const struct slow_oam_variableresponse_t *slow_oam_variableresponse;
 477         const struct slow_oam_loopbackctrl_t *slow_oam_loopbackctrl;
 478     } tlv;
 479
 480     ptr.slow_oam_common_header = (struct slow_oam_common_header_t *)tptr;
 481     tptr += sizeof(struct slow_oam_common_header_t);
 482     tlen -= sizeof(struct slow_oam_common_header_t);
 483
 484     ND_PRINT((ndo, "\n\tCode %s OAM PDU, Flags [%s]",
 485            tok2str(slow_oam_code_values, "Unknown (%u)", ptr.slow_oam_common_header->code),
 486            bittok2str(slow_oam_flag_values,
 487                       "none",
 488                       EXTRACT_16BITS(&ptr.slow_oam_common_header->flags))));
 489
 490     switch (ptr.slow_oam_common_header->code) {
 491     case SLOW_OAM_CODE_INFO:
 492         while (tlen > 0) {
 493             ptr.slow_oam_tlv_header = (const struct slow_oam_tlv_header_t *)tptr;
 494             ND_PRINT((ndo, "\n\t  %s Information Type (%u), length %u",
 495                    tok2str(slow_oam_info_type_values, "Reserved",
 496                            ptr.slow_oam_tlv_header->type),
 497                    ptr.slow_oam_tlv_header->type,
 498                    ptr.slow_oam_tlv_header->length));
 499
 500             hexdump = FALSE;
 501             switch (ptr.slow_oam_tlv_header->type) {
 502             case SLOW_OAM_INFO_TYPE_END_OF_TLV:
 503                 if (ptr.slow_oam_tlv_header->length != 0) {
 504                     ND_PRINT((ndo, "\n\t    ERROR: illegal length - should be 0"));
 505                 }
 506                 return;
 507
 508             case SLOW_OAM_INFO_TYPE_LOCAL: /* identical format - fall through */
 509             case SLOW_OAM_INFO_TYPE_REMOTE:
 510                 tlv.slow_oam_info = (const struct slow_oam_info_t *)tptr;
 511
 512                 if (tlv.slow_oam_info->info_length !=
 513                     sizeof(struct slow_oam_info_t)) {
 514                     ND_PRINT((ndo, "\n\t    ERROR: illegal length - should be %lu",
 515                            (unsigned long) sizeof(struct slow_oam_info_t)));
 516                     return;
 517                 }
 518
 519                 ND_PRINT((ndo, "\n\t    OAM-Version %u, Revision %u",
 520                        tlv.slow_oam_info->oam_version,
 521                        EXTRACT_16BITS(&tlv.slow_oam_info->revision)));
 522
 523                 ND_PRINT((ndo, "\n\t    State-Parser-Action %s, State-MUX-Action %s",
 524                        tok2str(slow_oam_info_type_state_parser_values, "Reserved",
 525                                tlv.slow_oam_info->state & OAM_INFO_TYPE_PARSER_MASK),
 526                        tok2str(slow_oam_info_type_state_mux_values, "Reserved",
 527                                tlv.slow_oam_info->state & OAM_INFO_TYPE_MUX_MASK)));
 528                 ND_PRINT((ndo, "\n\t    OAM-Config Flags [%s], OAM-PDU-Config max-PDU size %u",
 529                        bittok2str(slow_oam_info_type_oam_config_values, "none",
 530                                   tlv.slow_oam_info->oam_config),
 531                        EXTRACT_16BITS(&tlv.slow_oam_info->oam_pdu_config) &
 532                        OAM_INFO_TYPE_PDU_SIZE_MASK));
 533                 ND_PRINT((ndo, "\n\t    OUI %s (0x%06x), Vendor-Private 0x%08x",
 534                        tok2str(oui_values, "Unknown",
 535                                EXTRACT_24BITS(&tlv.slow_oam_info->oui)),
 536                        EXTRACT_24BITS(&tlv.slow_oam_info->oui),
 537                        EXTRACT_32BITS(&tlv.slow_oam_info->vendor_private)));
 538                 break;
 539
 540             case SLOW_OAM_INFO_TYPE_ORG_SPECIFIC:
 541                 hexdump = TRUE;
 542                 break;
 543
 544             default:
 545                 hexdump = TRUE;
 546                 break;
 547             }
 548
 549             /* infinite loop check */
 550             if (!ptr.slow_oam_tlv_header->length) {
 551                 return;
 552             }
 553
 554             /* do we also want to see a hex dump ? */
 555             if (ndo->ndo_vflag > 1 || hexdump==TRUE) {
 556                 print_unknown_data(ndo, tptr, "\n\t  ",
 557                                    ptr.slow_oam_tlv_header->length);
 558             }
 559
 560             tlen -= ptr.slow_oam_tlv_header->length;
 561             tptr += ptr.slow_oam_tlv_header->length;
 562         }
 563         break;
 564
 565     case SLOW_OAM_CODE_EVENT_NOTIF:
 566         while (tlen > 0) {
 567             ptr.slow_oam_tlv_header = (const struct slow_oam_tlv_header_t *)tptr;
 568             ND_PRINT((ndo, "\n\t  %s Link Event Type (%u), length %u",
 569                    tok2str(slow_oam_link_event_values, "Reserved",
 570                            ptr.slow_oam_tlv_header->type),
 571                    ptr.slow_oam_tlv_header->type,
 572                    ptr.slow_oam_tlv_header->length));
 573
 574             hexdump = FALSE;
 575             switch (ptr.slow_oam_tlv_header->type) {
 576             case SLOW_OAM_LINK_EVENT_END_OF_TLV:
 577                 if (ptr.slow_oam_tlv_header->length != 0) {
 578                     ND_PRINT((ndo, "\n\t    ERROR: illegal length - should be 0"));
 579                 }
 580                 return;
 581
 582             case SLOW_OAM_LINK_EVENT_ERR_SYM_PER: /* identical format - fall through */
 583             case SLOW_OAM_LINK_EVENT_ERR_FRM:
 584             case SLOW_OAM_LINK_EVENT_ERR_FRM_PER:
 585             case SLOW_OAM_LINK_EVENT_ERR_FRM_SUMM:
 586                 tlv.slow_oam_link_event = (const struct slow_oam_link_event_t *)tptr;
 587
 588                 if (tlv.slow_oam_link_event->event_length !=
 589                     sizeof(struct slow_oam_link_event_t)) {
 590                     ND_PRINT((ndo, "\n\t    ERROR: illegal length - should be %lu",
 591                            (unsigned long) sizeof(struct slow_oam_link_event_t)));
 592                     return;
 593                 }
 594
 595                 ND_PRINT((ndo, "\n\t    Timestamp %u ms, Errored Window %" PRIu64
 596                        "\n\t    Errored Threshold %" PRIu64
 597                        "\n\t    Errors %" PRIu64
 598                        "\n\t    Error Running Total %" PRIu64
 599                        "\n\t    Event Running Total %u",
 600                        EXTRACT_16BITS(&tlv.slow_oam_link_event->time_stamp)*100,
 601                        EXTRACT_64BITS(&tlv.slow_oam_link_event->window),
 602                        EXTRACT_64BITS(&tlv.slow_oam_link_event->threshold),
 603                        EXTRACT_64BITS(&tlv.slow_oam_link_event->errors),
 604                        EXTRACT_64BITS(&tlv.slow_oam_link_event->errors_running_total),
 605                        EXTRACT_32BITS(&tlv.slow_oam_link_event->event_running_total)));
 606                 break;
 607
 608             case SLOW_OAM_LINK_EVENT_ORG_SPECIFIC:
 609                 hexdump = TRUE;
 610                 break;
 611
 612             default:
 613                 hexdump = TRUE;
 614                 break;
 615             }
 616
 617             /* infinite loop check */
 618             if (!ptr.slow_oam_tlv_header->length) {
 619                 return;
 620             }
 621
 622             /* do we also want to see a hex dump ? */
 623             if (ndo->ndo_vflag > 1 || hexdump==TRUE) {
 624                 print_unknown_data(ndo, tptr, "\n\t  ",
 625                                    ptr.slow_oam_tlv_header->length);
 626             }
 627
 628             tlen -= ptr.slow_oam_tlv_header->length;
 629             tptr += ptr.slow_oam_tlv_header->length;
 630         }
 631         break;
 632
 633     case SLOW_OAM_CODE_LOOPBACK_CTRL:
 634         tlv.slow_oam_loopbackctrl = (const struct slow_oam_loopbackctrl_t *)tptr;
 635         ND_PRINT((ndo, "\n\t  Command %s (%u)",
 636                tok2str(slow_oam_loopbackctrl_cmd_values,
 637                        "Unknown",
 638                        tlv.slow_oam_loopbackctrl->command),
 639                tlv.slow_oam_loopbackctrl->command));
 640                tptr ++;
 641                tlen --;
 642         break;
 643
 644         /*
 645          * FIXME those are the defined codes that lack a decoder
 646          * you are welcome to contribute code ;-)
 647          */
 648     case SLOW_OAM_CODE_VAR_REQUEST:
 649     case SLOW_OAM_CODE_VAR_RESPONSE:
 650     case SLOW_OAM_CODE_PRIVATE:
 651     default:
 652         if (ndo->ndo_vflag <= 1) {
 653             print_unknown_data(ndo, tptr, "\n\t  ", tlen);
 654         }
 655         break;
 656     }
 657     return;
 658 }