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@gredler.at)
  19  */
  20
  21 /* \summary: IEEE "slow protocols" (802.3ad/802.3ah) printer */
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include "netdissect-stdinc.h"
  28
  29 #include "netdissect.h"
  30 #include "extract.h"
  31 #include "addrtoname.h"
  32 #include "oui.h"
  33
  34
  35 #define SLOW_PROTO_LACP                     1
  36 #define SLOW_PROTO_MARKER                   2
  37 #define SLOW_PROTO_OAM                      3
  38
  39 #define LACP_VERSION                        1
  40 #define MARKER_VERSION                      1
  41
  42 static const struct tok slow_proto_values[] = {
  43     { SLOW_PROTO_LACP, "LACP" },
  44     { SLOW_PROTO_MARKER, "MARKER" },
  45     { SLOW_PROTO_OAM, "OAM" },
  46     { 0, NULL}
  47 };
  48
  49 static const struct tok slow_oam_flag_values[] = {
  50     { 0x0001, "Link Fault" },
  51     { 0x0002, "Dying Gasp" },
  52     { 0x0004, "Critical Event" },
  53     { 0x0008, "Local Evaluating" },
  54     { 0x0010, "Local Stable" },
  55     { 0x0020, "Remote Evaluating" },
  56     { 0x0040, "Remote Stable" },
  57     { 0, NULL}
  58 };
  59
  60 #define SLOW_OAM_CODE_INFO          0x00
  61 #define SLOW_OAM_CODE_EVENT_NOTIF   0x01
  62 #define SLOW_OAM_CODE_VAR_REQUEST   0x02
  63 #define SLOW_OAM_CODE_VAR_RESPONSE  0x03
  64 #define SLOW_OAM_CODE_LOOPBACK_CTRL 0x04
  65 #define SLOW_OAM_CODE_PRIVATE       0xfe
  66
  67 static const struct tok slow_oam_code_values[] = {
  68     { SLOW_OAM_CODE_INFO, "Information" },
  69     { SLOW_OAM_CODE_EVENT_NOTIF, "Event Notification" },
  70     { SLOW_OAM_CODE_VAR_REQUEST, "Variable Request" },
  71     { SLOW_OAM_CODE_VAR_RESPONSE, "Variable Response" },
  72     { SLOW_OAM_CODE_LOOPBACK_CTRL, "Loopback Control" },
  73     { SLOW_OAM_CODE_PRIVATE, "Vendor Private" },
  74     { 0, NULL}
  75 };
  76
  77 struct slow_oam_info_t {
  78     nd_uint8_t info_type;
  79     nd_uint8_t info_length;
  80     nd_uint8_t oam_version;
  81     nd_uint16_t revision;
  82     nd_uint8_t state;
  83     nd_uint8_t oam_config;
  84     nd_uint16_t oam_pdu_config;
  85     nd_uint24_t oui;
  86     nd_uint32_t vendor_private;
  87 };
  88
  89 #define SLOW_OAM_INFO_TYPE_END_OF_TLV 0x00
  90 #define SLOW_OAM_INFO_TYPE_LOCAL 0x01
  91 #define SLOW_OAM_INFO_TYPE_REMOTE 0x02
  92 #define SLOW_OAM_INFO_TYPE_ORG_SPECIFIC 0xfe
  93
  94 static const struct tok slow_oam_info_type_values[] = {
  95     { SLOW_OAM_INFO_TYPE_END_OF_TLV, "End of TLV marker" },
  96     { SLOW_OAM_INFO_TYPE_LOCAL, "Local" },
  97     { SLOW_OAM_INFO_TYPE_REMOTE, "Remote" },
  98     { SLOW_OAM_INFO_TYPE_ORG_SPECIFIC, "Organization specific" },
  99     { 0, NULL}
 100 };
 101
 102 #define OAM_INFO_TYPE_PARSER_MASK 0x3
 103 static const struct tok slow_oam_info_type_state_parser_values[] = {
 104     { 0x00, "forwarding" },
 105     { 0x01, "looping back" },
 106     { 0x02, "discarding" },
 107     { 0x03, "reserved" },
 108     { 0, NULL}
 109 };
 110
 111 #define OAM_INFO_TYPE_MUX_MASK 0x4
 112 static const struct tok slow_oam_info_type_state_mux_values[] = {
 113     { 0x00, "forwarding" },
 114     { 0x04, "discarding" },
 115     { 0, NULL}
 116 };
 117
 118 static const struct tok slow_oam_info_type_oam_config_values[] = {
 119     { 0x01, "Active" },
 120     { 0x02, "Unidirectional" },
 121     { 0x04, "Remote-Loopback" },
 122     { 0x08, "Link-Events" },
 123     { 0x10, "Variable-Retrieval" },
 124     { 0, NULL}
 125 };
 126
 127 /* 11 Bits */
 128 #define OAM_INFO_TYPE_PDU_SIZE_MASK 0x7ff
 129
 130 #define SLOW_OAM_LINK_EVENT_END_OF_TLV 0x00
 131 #define SLOW_OAM_LINK_EVENT_ERR_SYM_PER 0x01
 132 #define SLOW_OAM_LINK_EVENT_ERR_FRM 0x02
 133 #define SLOW_OAM_LINK_EVENT_ERR_FRM_PER 0x03
 134 #define SLOW_OAM_LINK_EVENT_ERR_FRM_SUMM 0x04
 135 #define SLOW_OAM_LINK_EVENT_ORG_SPECIFIC 0xfe
 136
 137 static const struct tok slow_oam_link_event_values[] = {
 138     { SLOW_OAM_LINK_EVENT_END_OF_TLV, "End of TLV marker" },
 139     { SLOW_OAM_LINK_EVENT_ERR_SYM_PER, "Errored Symbol Period Event" },
 140     { SLOW_OAM_LINK_EVENT_ERR_FRM, "Errored Frame Event" },
 141     { SLOW_OAM_LINK_EVENT_ERR_FRM_PER, "Errored Frame Period Event" },
 142     { SLOW_OAM_LINK_EVENT_ERR_FRM_SUMM, "Errored Frame Seconds Summary Event" },
 143     { SLOW_OAM_LINK_EVENT_ORG_SPECIFIC, "Organization specific" },
 144     { 0, NULL}
 145 };
 146
 147 struct slow_oam_link_event_t {
 148     nd_uint8_t event_type;
 149     nd_uint8_t event_length;
 150     nd_uint16_t time_stamp;
 151     nd_uint64_t window;
 152     nd_uint64_t threshold;
 153     nd_uint64_t errors;
 154     nd_uint64_t errors_running_total;
 155     nd_uint32_t event_running_total;
 156 };
 157
 158 struct slow_oam_variablerequest_t {
 159     nd_uint8_t branch;
 160     nd_uint16_t leaf;
 161 };
 162
 163 struct slow_oam_variableresponse_t {
 164     nd_uint8_t branch;
 165     nd_uint16_t leaf;
 166     nd_uint8_t length;
 167 };
 168
 169 struct slow_oam_loopbackctrl_t {
 170     nd_uint8_t command;
 171 };
 172
 173 static const struct tok slow_oam_loopbackctrl_cmd_values[] = {
 174     { 0x01, "Enable OAM Remote Loopback" },
 175     { 0x02, "Disable OAM Remote Loopback" },
 176     { 0, NULL}
 177 };
 178
 179 struct tlv_header_t {
 180     nd_uint8_t type;
 181     nd_uint8_t length;
 182 };
 183
 184 #define LACP_MARKER_TLV_TERMINATOR     0x00  /* same code for LACP and Marker */
 185
 186 #define LACP_TLV_ACTOR_INFO            0x01
 187 #define LACP_TLV_PARTNER_INFO          0x02
 188 #define LACP_TLV_COLLECTOR_INFO        0x03
 189
 190 #define MARKER_TLV_MARKER_INFO         0x01
 191
 192 static const struct tok slow_tlv_values[] = {
 193     { (SLOW_PROTO_LACP << 8) + LACP_MARKER_TLV_TERMINATOR, "Terminator"},
 194     { (SLOW_PROTO_LACP << 8) + LACP_TLV_ACTOR_INFO, "Actor Information"},
 195     { (SLOW_PROTO_LACP << 8) + LACP_TLV_PARTNER_INFO, "Partner Information"},
 196     { (SLOW_PROTO_LACP << 8) + LACP_TLV_COLLECTOR_INFO, "Collector Information"},
 197
 198     { (SLOW_PROTO_MARKER << 8) + LACP_MARKER_TLV_TERMINATOR, "Terminator"},
 199     { (SLOW_PROTO_MARKER << 8) + MARKER_TLV_MARKER_INFO, "Marker Information"},
 200     { 0, NULL}
 201 };
 202
 203 struct lacp_tlv_actor_partner_info_t {
 204     nd_uint16_t sys_pri;
 205     nd_mac_addr sys;
 206     nd_uint16_t key;
 207     nd_uint16_t port_pri;
 208     nd_uint16_t port;
 209     nd_uint8_t state;
 210     nd_byte    pad[3];
 211 };
 212
 213 static const struct tok lacp_tlv_actor_partner_info_state_values[] = {
 214     { 0x01, "Activity"},
 215     { 0x02, "Timeout"},
 216     { 0x04, "Aggregation"},
 217     { 0x08, "Synchronization"},
 218     { 0x10, "Collecting"},
 219     { 0x20, "Distributing"},
 220     { 0x40, "Default"},
 221     { 0x80, "Expired"},
 222     { 0, NULL}
 223 };
 224
 225 struct lacp_tlv_collector_info_t {
 226     nd_uint16_t max_delay;
 227     nd_byte     pad[12];
 228 };
 229
 230 struct marker_tlv_marker_info_t {
 231     nd_uint16_t req_port;
 232     nd_mac_addr req_sys;
 233     nd_uint32_t req_trans_id;
 234     nd_byte     pad[2];
 235 };
 236
 237 struct lacp_marker_tlv_terminator_t {
 238     nd_byte     pad[50];
 239 };
 240
 241 static void slow_marker_lacp_print(netdissect_options *, const u_char *, u_int, u_int);
 242 static void slow_oam_print(netdissect_options *, const u_char *, u_int);
 243
 244 void
 245 slow_print(netdissect_options *ndo,
 246            const u_char *pptr, u_int len)
 247 {
 248     int print_version;
 249     u_int subtype;
 250
 251     ndo->ndo_protocol = "slow";
 252     if (len < 1)
 253         goto tooshort;
 254     subtype = GET_U_1(pptr);
 255
 256     /*
 257      * Sanity checking of the header.
 258      */
 259     switch (subtype) {
 260     case SLOW_PROTO_LACP:
 261         if (len < 2)
 262             goto tooshort;
 263         if (GET_U_1(pptr + 1) != LACP_VERSION) {
 264             ND_PRINT("LACP version %u packet not supported",
 265                      GET_U_1(pptr + 1));
 266             return;
 267         }
 268         print_version = 1;
 269         break;
 270
 271     case SLOW_PROTO_MARKER:
 272         if (len < 2)
 273             goto tooshort;
 274         if (GET_U_1(pptr + 1) != MARKER_VERSION) {
 275             ND_PRINT("MARKER version %u packet not supported",
 276                      GET_U_1(pptr + 1));
 277             return;
 278         }
 279         print_version = 1;
 280         break;
 281
 282     case SLOW_PROTO_OAM: /* fall through */
 283         print_version = 0;
 284         break;
 285
 286     default:
 287         /* print basic information and exit */
 288         print_version = -1;
 289         break;
 290     }
 291
 292     if (print_version == 1) {
 293         ND_PRINT("%sv%u, length %u",
 294                tok2str(slow_proto_values, "unknown (%u)", subtype),
 295                GET_U_1((pptr + 1)),
 296                len);
 297     } else {
 298         /* some slow protos don't have a version number in the header */
 299         ND_PRINT("%s, length %u",
 300                tok2str(slow_proto_values, "unknown (%u)", subtype),
 301                len);
 302     }
 303
 304     /* unrecognized subtype */
 305     if (print_version == -1) {
 306         print_unknown_data(ndo, pptr, "\n\t", len);
 307         return;
 308     }
 309
 310     if (!ndo->ndo_vflag)
 311         return;
 312
 313     switch (subtype) {
 314     default: /* should not happen */
 315         break;
 316
 317     case SLOW_PROTO_OAM:
 318         /* skip subtype */
 319         len -= 1;
 320         pptr += 1;
 321         slow_oam_print(ndo, pptr, len);
 322         break;
 323
 324     case SLOW_PROTO_LACP:   /* LACP and MARKER share the same semantics */
 325     case SLOW_PROTO_MARKER:
 326         /* skip subtype and version */
 327         len -= 2;
 328         pptr += 2;
 329         slow_marker_lacp_print(ndo, pptr, len, subtype);
 330         break;
 331     }
 332     return;
 333
 334 tooshort:
 335     if (!ndo->ndo_vflag)
 336         ND_PRINT(" (packet is too short)");
 337     else
 338         ND_PRINT("\n\t\t packet is too short");
 339 }
 340
 341 static void
 342 slow_marker_lacp_print(netdissect_options *ndo,
 343                        const u_char *tptr, u_int tlen,
 344                        u_int proto_subtype)
 345 {
 346     const struct tlv_header_t *tlv_header;
 347     const u_char *tlv_tptr;
 348     u_int tlv_type, tlv_len, tlv_tlen;
 349
 350     union {
 351         const struct lacp_marker_tlv_terminator_t *lacp_marker_tlv_terminator;
 352         const struct lacp_tlv_actor_partner_info_t *lacp_tlv_actor_partner_info;
 353         const struct lacp_tlv_collector_info_t *lacp_tlv_collector_info;
 354         const struct marker_tlv_marker_info_t *marker_tlv_marker_info;
 355     } tlv_ptr;
 356
 357     while(tlen>0) {
 358         /* is the packet big enough to include the tlv header ? */
 359         if (tlen < sizeof(struct tlv_header_t))
 360             goto tooshort;
 361         /* did we capture enough for fully decoding the tlv header ? */
 362         ND_TCHECK_LEN(tptr, sizeof(struct tlv_header_t));
 363         tlv_header = (const struct tlv_header_t *)tptr;
 364         tlv_type = GET_U_1(tlv_header->type);
 365         tlv_len = GET_U_1(tlv_header->length);
 366
 367         ND_PRINT("\n\t%s TLV (0x%02x), length %u",
 368                tok2str(slow_tlv_values,
 369                        "Unknown",
 370                        (proto_subtype << 8) + tlv_type),
 371                tlv_type,
 372                tlv_len);
 373
 374         if (tlv_type == LACP_MARKER_TLV_TERMINATOR) {
 375             /*
 376              * This TLV has a length of zero, and means there are no
 377              * more TLVs to process.
 378              */
 379             return;
 380         }
 381
 382         /* length includes the type and length fields */
 383         if (tlv_len < sizeof(struct tlv_header_t)) {
 384             ND_PRINT("\n\t    ERROR: illegal length - should be >= %zu",
 385                    sizeof(struct tlv_header_t));
 386             return;
 387         }
 388
 389         /* is the packet big enough to include the tlv ? */
 390         if (tlen < tlv_len)
 391             goto tooshort;
 392         /* did we capture enough for fully decoding the tlv ? */
 393         ND_TCHECK_LEN(tptr, tlv_len);
 394
 395         tlv_tptr=tptr+sizeof(struct tlv_header_t);
 396         tlv_tlen=tlv_len-sizeof(struct tlv_header_t);
 397
 398         switch((proto_subtype << 8) + tlv_type) {
 399
 400             /* those two TLVs have the same structure -> fall through */
 401         case ((SLOW_PROTO_LACP << 8) + LACP_TLV_ACTOR_INFO):
 402         case ((SLOW_PROTO_LACP << 8) + LACP_TLV_PARTNER_INFO):
 403             if (tlv_tlen !=
 404                 sizeof(struct lacp_tlv_actor_partner_info_t)) {
 405                 ND_PRINT("\n\t    ERROR: illegal length - should be %zu",
 406                        sizeof(struct tlv_header_t) + sizeof(struct lacp_tlv_actor_partner_info_t));
 407                 goto badlength;
 408             }
 409
 410             tlv_ptr.lacp_tlv_actor_partner_info = (const struct lacp_tlv_actor_partner_info_t *)tlv_tptr;
 411
 412             ND_PRINT("\n\t  System %s, System Priority %u, Key %u"
 413                    ", Port %u, Port Priority %u\n\t  State Flags [%s]",
 414                    GET_ETHERADDR_STRING(tlv_ptr.lacp_tlv_actor_partner_info->sys),
 415                    GET_BE_U_2(tlv_ptr.lacp_tlv_actor_partner_info->sys_pri),
 416                    GET_BE_U_2(tlv_ptr.lacp_tlv_actor_partner_info->key),
 417                    GET_BE_U_2(tlv_ptr.lacp_tlv_actor_partner_info->port),
 418                    GET_BE_U_2(tlv_ptr.lacp_tlv_actor_partner_info->port_pri),
 419                    bittok2str(lacp_tlv_actor_partner_info_state_values,
 420                               "none",
 421                               GET_U_1(tlv_ptr.lacp_tlv_actor_partner_info->state)));
 422
 423             break;
 424
 425         case ((SLOW_PROTO_LACP << 8) + LACP_TLV_COLLECTOR_INFO):
 426             if (tlv_tlen !=
 427                 sizeof(struct lacp_tlv_collector_info_t)) {
 428                 ND_PRINT("\n\t    ERROR: illegal length - should be %zu",
 429                        sizeof(struct tlv_header_t) + sizeof(struct lacp_tlv_collector_info_t));
 430                 goto badlength;
 431             }
 432
 433             tlv_ptr.lacp_tlv_collector_info = (const struct lacp_tlv_collector_info_t *)tlv_tptr;
 434
 435             ND_PRINT("\n\t  Max Delay %u",
 436                    GET_BE_U_2(tlv_ptr.lacp_tlv_collector_info->max_delay));
 437
 438             break;
 439
 440         case ((SLOW_PROTO_MARKER << 8) + MARKER_TLV_MARKER_INFO):
 441             if (tlv_tlen !=
 442                 sizeof(struct marker_tlv_marker_info_t)) {
 443                 ND_PRINT("\n\t    ERROR: illegal length - should be %zu",
 444                        sizeof(struct tlv_header_t) + sizeof(struct marker_tlv_marker_info_t));
 445                 goto badlength;
 446             }
 447
 448             tlv_ptr.marker_tlv_marker_info = (const struct marker_tlv_marker_info_t *)tlv_tptr;
 449
 450             ND_PRINT("\n\t  Request System %s, Request Port %u, Request Transaction ID 0x%08x",
 451                    GET_ETHERADDR_STRING(tlv_ptr.marker_tlv_marker_info->req_sys),
 452                    GET_BE_U_2(tlv_ptr.marker_tlv_marker_info->req_port),
 453                    GET_BE_U_4(tlv_ptr.marker_tlv_marker_info->req_trans_id));
 454
 455             break;
 456
 457         default:
 458             if (ndo->ndo_vflag <= 1)
 459                 print_unknown_data(ndo, tlv_tptr, "\n\t  ", tlv_tlen);
 460             break;
 461         }
 462
 463     badlength:
 464         /* do we want to see an additional hexdump ? */
 465         if (ndo->ndo_vflag > 1) {
 466             print_unknown_data(ndo, tptr+sizeof(struct tlv_header_t), "\n\t  ",
 467                                tlv_len-sizeof(struct tlv_header_t));
 468         }
 469
 470         tptr+=tlv_len;
 471         tlen-=tlv_len;
 472     }
 473     return;
 474
 475 tooshort:
 476     ND_PRINT("\n\t\t packet is too short");
 477     return;
 478
 479 trunc:
 480     nd_print_trunc(ndo);
 481 }
 482
 483 static void
 484 slow_oam_print(netdissect_options *ndo,
 485                const u_char *tptr, u_int tlen)
 486 {
 487     uint8_t code;
 488     uint8_t type, length;
 489     uint8_t state;
 490     uint8_t command;
 491     u_int hexdump;
 492
 493     struct slow_oam_common_header_t {
 494         nd_uint16_t flags;
 495         nd_uint8_t code;
 496     };
 497
 498     struct slow_oam_tlv_header_t {
 499         nd_uint8_t type;
 500         nd_uint8_t length;
 501     };
 502
 503     union {
 504         const struct slow_oam_common_header_t *slow_oam_common_header;
 505         const struct slow_oam_tlv_header_t *slow_oam_tlv_header;
 506     } ptr;
 507
 508     union {
 509         const struct slow_oam_info_t *slow_oam_info;
 510         const struct slow_oam_link_event_t *slow_oam_link_event;
 511         const struct slow_oam_variablerequest_t *slow_oam_variablerequest;
 512         const struct slow_oam_variableresponse_t *slow_oam_variableresponse;
 513         const struct slow_oam_loopbackctrl_t *slow_oam_loopbackctrl;
 514     } tlv;
 515
 516     ptr.slow_oam_common_header = (const struct slow_oam_common_header_t *)tptr;
 517     if (tlen < sizeof(*ptr.slow_oam_common_header))
 518         goto tooshort;
 519     ND_TCHECK_SIZE(ptr.slow_oam_common_header);
 520     tptr += sizeof(struct slow_oam_common_header_t);
 521     tlen -= sizeof(struct slow_oam_common_header_t);
 522
 523     code = GET_U_1(ptr.slow_oam_common_header->code);
 524     ND_PRINT("\n\tCode %s OAM PDU, Flags [%s]",
 525            tok2str(slow_oam_code_values, "Unknown (%u)", code),
 526            bittok2str(slow_oam_flag_values,
 527                       "none",
 528                       GET_BE_U_2(ptr.slow_oam_common_header->flags)));
 529
 530     switch (code) {
 531     case SLOW_OAM_CODE_INFO:
 532         while (tlen > 0) {
 533             ptr.slow_oam_tlv_header = (const struct slow_oam_tlv_header_t *)tptr;
 534             if (tlen < sizeof(*ptr.slow_oam_tlv_header))
 535                 goto tooshort;
 536             ND_TCHECK_SIZE(ptr.slow_oam_tlv_header);
 537             type = GET_U_1(ptr.slow_oam_tlv_header->type);
 538             length = GET_U_1(ptr.slow_oam_tlv_header->length);
 539             ND_PRINT("\n\t  %s Information Type (%u), length %u",
 540                    tok2str(slow_oam_info_type_values, "Reserved", type),
 541                    type,
 542                    length);
 543
 544             if (type == SLOW_OAM_INFO_TYPE_END_OF_TLV) {
 545                 /*
 546                  * As IEEE Std 802.3-2015 says for the End of TLV Marker,
 547                  * "(the length and value of the Type 0x00 TLV can be ignored)".
 548                  */
 549                 return;
 550             }
 551
 552             /* length includes the type and length fields */
 553             if (length < sizeof(struct slow_oam_tlv_header_t)) {
 554                 ND_PRINT("\n\t    ERROR: illegal length - should be >= %u",
 555                        (u_int)sizeof(struct slow_oam_tlv_header_t));
 556                 return;
 557             }
 558
 559             if (tlen < length)
 560                 goto tooshort;
 561             ND_TCHECK_LEN(tptr, length);
 562
 563             hexdump = FALSE;
 564             switch (type) {
 565             case SLOW_OAM_INFO_TYPE_LOCAL: /* identical format - fall through */
 566             case SLOW_OAM_INFO_TYPE_REMOTE:
 567                 tlv.slow_oam_info = (const struct slow_oam_info_t *)tptr;
 568
 569                 if (GET_U_1(tlv.slow_oam_info->info_length) !=
 570                     sizeof(struct slow_oam_info_t)) {
 571                     ND_PRINT("\n\t    ERROR: illegal length - should be %zu",
 572                            sizeof(struct slow_oam_info_t));
 573                     hexdump = TRUE;
 574                     goto badlength_code_info;
 575                 }
 576
 577                 ND_PRINT("\n\t    OAM-Version %u, Revision %u",
 578                        GET_U_1(tlv.slow_oam_info->oam_version),
 579                        GET_BE_U_2(tlv.slow_oam_info->revision));
 580
 581                 state = GET_U_1(tlv.slow_oam_info->state);
 582                 ND_PRINT("\n\t    State-Parser-Action %s, State-MUX-Action %s",
 583                        tok2str(slow_oam_info_type_state_parser_values, "Reserved",
 584                                state & OAM_INFO_TYPE_PARSER_MASK),
 585                        tok2str(slow_oam_info_type_state_mux_values, "Reserved",
 586                                state & OAM_INFO_TYPE_MUX_MASK));
 587                 ND_PRINT("\n\t    OAM-Config Flags [%s], OAM-PDU-Config max-PDU size %u",
 588                        bittok2str(slow_oam_info_type_oam_config_values, "none",
 589                                   GET_U_1(tlv.slow_oam_info->oam_config)),
 590                        GET_BE_U_2(tlv.slow_oam_info->oam_pdu_config) &
 591                        OAM_INFO_TYPE_PDU_SIZE_MASK);
 592                 ND_PRINT("\n\t    OUI %s (0x%06x), Vendor-Private 0x%08x",
 593                        tok2str(oui_values, "Unknown",
 594                                GET_BE_U_3(tlv.slow_oam_info->oui)),
 595                        GET_BE_U_3(tlv.slow_oam_info->oui),
 596                        GET_BE_U_4(tlv.slow_oam_info->vendor_private));
 597                 break;
 598
 599             case SLOW_OAM_INFO_TYPE_ORG_SPECIFIC:
 600                 hexdump = TRUE;
 601                 break;
 602
 603             default:
 604                 hexdump = TRUE;
 605                 break;
 606             }
 607
 608         badlength_code_info:
 609             /* do we also want to see a hex dump ? */
 610             if (ndo->ndo_vflag > 1 || hexdump==TRUE) {
 611                 print_unknown_data(ndo, tptr, "\n\t  ",
 612                                    length);
 613             }
 614
 615             tlen -= length;
 616             tptr += length;
 617         }
 618         break;
 619
 620     case SLOW_OAM_CODE_EVENT_NOTIF:
 621         /* Sequence number */
 622         if (tlen < 2)
 623             goto tooshort;
 624         ND_PRINT("\n\t  Sequence Number %u", GET_BE_U_2(tptr));
 625         tlen -= 2;
 626         tptr += 2;
 627
 628         /* TLVs */
 629         while (tlen > 0) {
 630             ptr.slow_oam_tlv_header = (const struct slow_oam_tlv_header_t *)tptr;
 631             if (tlen < sizeof(*ptr.slow_oam_tlv_header))
 632                 goto tooshort;
 633             ND_TCHECK_SIZE(ptr.slow_oam_tlv_header);
 634             type = GET_U_1(ptr.slow_oam_tlv_header->type);
 635             length = GET_U_1(ptr.slow_oam_tlv_header->length);
 636             ND_PRINT("\n\t  %s Link Event Type (%u), length %u",
 637                    tok2str(slow_oam_link_event_values, "Reserved",
 638                            type),
 639                    type,
 640                    length);
 641
 642             if (type == SLOW_OAM_INFO_TYPE_END_OF_TLV) {
 643                 /*
 644                  * As IEEE Std 802.3-2015 says for the End of TLV Marker,
 645                  * "(the length and value of the Type 0x00 TLV can be ignored)".
 646                  */
 647                 return;
 648             }
 649
 650             /* length includes the type and length fields */
 651             if (length < sizeof(struct slow_oam_tlv_header_t)) {
 652                 ND_PRINT("\n\t    ERROR: illegal length - should be >= %u",
 653                        (u_int)sizeof(struct slow_oam_tlv_header_t));
 654                 return;
 655             }
 656
 657             if (tlen < length)
 658                 goto tooshort;
 659             ND_TCHECK_LEN(tptr, length);
 660
 661             hexdump = FALSE;
 662             switch (type) {
 663             case SLOW_OAM_LINK_EVENT_ERR_SYM_PER: /* identical format - fall through */
 664             case SLOW_OAM_LINK_EVENT_ERR_FRM:
 665             case SLOW_OAM_LINK_EVENT_ERR_FRM_PER:
 666             case SLOW_OAM_LINK_EVENT_ERR_FRM_SUMM:
 667                 tlv.slow_oam_link_event = (const struct slow_oam_link_event_t *)tptr;
 668
 669                 if (GET_U_1(tlv.slow_oam_link_event->event_length) !=
 670                     sizeof(struct slow_oam_link_event_t)) {
 671                     ND_PRINT("\n\t    ERROR: illegal length - should be %zu",
 672                            sizeof(struct slow_oam_link_event_t));
 673                     hexdump = TRUE;
 674                     goto badlength_event_notif;
 675                 }
 676
 677                 ND_PRINT("\n\t    Timestamp %u ms, Errored Window %" PRIu64
 678                        "\n\t    Errored Threshold %" PRIu64
 679                        "\n\t    Errors %" PRIu64
 680                        "\n\t    Error Running Total %" PRIu64
 681                        "\n\t    Event Running Total %u",
 682                        GET_BE_U_2(tlv.slow_oam_link_event->time_stamp)*100,
 683                        GET_BE_U_8(tlv.slow_oam_link_event->window),
 684                        GET_BE_U_8(tlv.slow_oam_link_event->threshold),
 685                        GET_BE_U_8(tlv.slow_oam_link_event->errors),
 686                        GET_BE_U_8(tlv.slow_oam_link_event->errors_running_total),
 687                        GET_BE_U_4(tlv.slow_oam_link_event->event_running_total));
 688                 break;
 689
 690             case SLOW_OAM_LINK_EVENT_ORG_SPECIFIC:
 691                 hexdump = TRUE;
 692                 break;
 693
 694             default:
 695                 hexdump = TRUE;
 696                 break;
 697             }
 698
 699         badlength_event_notif:
 700             /* do we also want to see a hex dump ? */
 701             if (ndo->ndo_vflag > 1 || hexdump==TRUE) {
 702                 print_unknown_data(ndo, tptr, "\n\t  ",
 703                                    length);
 704             }
 705
 706             tlen -= length;
 707             tptr += length;
 708         }
 709         break;
 710
 711     case SLOW_OAM_CODE_LOOPBACK_CTRL:
 712         tlv.slow_oam_loopbackctrl = (const struct slow_oam_loopbackctrl_t *)tptr;
 713         if (tlen < sizeof(*tlv.slow_oam_loopbackctrl))
 714             goto tooshort;
 715         ND_TCHECK_SIZE(tlv.slow_oam_loopbackctrl);
 716         command = GET_U_1(tlv.slow_oam_loopbackctrl->command);
 717         ND_PRINT("\n\t  Command %s (%u)",
 718                tok2str(slow_oam_loopbackctrl_cmd_values,
 719                        "Unknown",
 720                        command),
 721                command);
 722         tptr ++;
 723         tlen --;
 724         break;
 725
 726         /*
 727          * FIXME those are the defined codes that lack a decoder
 728          * you are welcome to contribute code ;-)
 729          */
 730     case SLOW_OAM_CODE_VAR_REQUEST:
 731     case SLOW_OAM_CODE_VAR_RESPONSE:
 732     case SLOW_OAM_CODE_PRIVATE:
 733     default:
 734         if (ndo->ndo_vflag <= 1) {
 735             print_unknown_data(ndo, tptr, "\n\t  ", tlen);
 736         }
 737         break;
 738     }
 739     return;
 740
 741 tooshort:
 742     ND_PRINT("\n\t\t packet is too short");
 743     return;
 744
 745 trunc:
 746     nd_print_trunc(ndo);
 747 }