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 #define SLOW_PROTO_LACP                     1
  35 #define SLOW_PROTO_MARKER                   2
  36 #define SLOW_PROTO_OAM                      3
  37
  38 #define LACP_VERSION                        1
  39 #define MARKER_VERSION                      1
  40
  41 static const struct tok slow_proto_values[] = {
  42     { SLOW_PROTO_LACP, "LACP" },
  43     { SLOW_PROTO_MARKER, "MARKER" },
  44     { SLOW_PROTO_OAM, "OAM" },
  45     { 0, NULL}
  46 };
  47
  48 static const struct tok slow_oam_flag_values[] = {
  49     { 0x0001, "Link Fault" },
  50     { 0x0002, "Dying Gasp" },
  51     { 0x0004, "Critical Event" },
  52     { 0x0008, "Local Evaluating" },
  53     { 0x0010, "Local Stable" },
  54     { 0x0020, "Remote Evaluating" },
  55     { 0x0040, "Remote Stable" },
  56     { 0, NULL}
  57 };
  58
  59 #define SLOW_OAM_CODE_INFO          0x00
  60 #define SLOW_OAM_CODE_EVENT_NOTIF   0x01
  61 #define SLOW_OAM_CODE_VAR_REQUEST   0x02
  62 #define SLOW_OAM_CODE_VAR_RESPONSE  0x03
  63 #define SLOW_OAM_CODE_LOOPBACK_CTRL 0x04
  64 #define SLOW_OAM_CODE_PRIVATE       0xfe
  65
  66 static const struct tok slow_oam_code_values[] = {
  67     { SLOW_OAM_CODE_INFO, "Information" },
  68     { SLOW_OAM_CODE_EVENT_NOTIF, "Event Notification" },
  69     { SLOW_OAM_CODE_VAR_REQUEST, "Variable Request" },
  70     { SLOW_OAM_CODE_VAR_RESPONSE, "Variable Response" },
  71     { SLOW_OAM_CODE_LOOPBACK_CTRL, "Loopback Control" },
  72     { SLOW_OAM_CODE_PRIVATE, "Vendor Private" },
  73     { 0, NULL}
  74 };
  75
  76 struct slow_oam_info_t {
  77     nd_uint8_t info_type;
  78     nd_uint8_t info_length;
  79     nd_uint8_t oam_version;
  80     nd_uint16_t revision;
  81     nd_uint8_t state;
  82     nd_uint8_t oam_config;
  83     nd_uint16_t oam_pdu_config;
  84     nd_uint24_t oui;
  85     nd_uint32_t vendor_private;
  86 };
  87
  88 #define SLOW_OAM_INFO_TYPE_END_OF_TLV 0x00
  89 #define SLOW_OAM_INFO_TYPE_LOCAL 0x01
  90 #define SLOW_OAM_INFO_TYPE_REMOTE 0x02
  91 #define SLOW_OAM_INFO_TYPE_ORG_SPECIFIC 0xfe
  92
  93 static const struct tok slow_oam_info_type_values[] = {
  94     { SLOW_OAM_INFO_TYPE_END_OF_TLV, "End of TLV marker" },
  95     { SLOW_OAM_INFO_TYPE_LOCAL, "Local" },
  96     { SLOW_OAM_INFO_TYPE_REMOTE, "Remote" },
  97     { SLOW_OAM_INFO_TYPE_ORG_SPECIFIC, "Organization specific" },
  98     { 0, NULL}
  99 };
 100
 101 #define OAM_INFO_TYPE_PARSER_MASK 0x3
 102 static const struct tok slow_oam_info_type_state_parser_values[] = {
 103     { 0x00, "forwarding" },
 104     { 0x01, "looping back" },
 105     { 0x02, "discarding" },
 106     { 0x03, "reserved" },
 107     { 0, NULL}
 108 };
 109
 110 #define OAM_INFO_TYPE_MUX_MASK 0x4
 111 static const struct tok slow_oam_info_type_state_mux_values[] = {
 112     { 0x00, "forwarding" },
 113     { 0x04, "discarding" },
 114     { 0, NULL}
 115 };
 116
 117 static const struct tok slow_oam_info_type_oam_config_values[] = {
 118     { 0x01, "Active" },
 119     { 0x02, "Unidirectional" },
 120     { 0x04, "Remote-Loopback" },
 121     { 0x08, "Link-Events" },
 122     { 0x10, "Variable-Retrieval" },
 123     { 0, NULL}
 124 };
 125
 126 /* 11 Bits */
 127 #define OAM_INFO_TYPE_PDU_SIZE_MASK 0x7ff
 128
 129 #define SLOW_OAM_LINK_EVENT_END_OF_TLV 0x00
 130 #define SLOW_OAM_LINK_EVENT_ERR_SYM_PER 0x01
 131 #define SLOW_OAM_LINK_EVENT_ERR_FRM 0x02
 132 #define SLOW_OAM_LINK_EVENT_ERR_FRM_PER 0x03
 133 #define SLOW_OAM_LINK_EVENT_ERR_FRM_SUMM 0x04
 134 #define SLOW_OAM_LINK_EVENT_ORG_SPECIFIC 0xfe
 135
 136 static const struct tok slow_oam_link_event_values[] = {
 137     { SLOW_OAM_LINK_EVENT_END_OF_TLV, "End of TLV marker" },
 138     { SLOW_OAM_LINK_EVENT_ERR_SYM_PER, "Errored Symbol Period Event" },
 139     { SLOW_OAM_LINK_EVENT_ERR_FRM, "Errored Frame Event" },
 140     { SLOW_OAM_LINK_EVENT_ERR_FRM_PER, "Errored Frame Period Event" },
 141     { SLOW_OAM_LINK_EVENT_ERR_FRM_SUMM, "Errored Frame Seconds Summary Event" },
 142     { SLOW_OAM_LINK_EVENT_ORG_SPECIFIC, "Organization specific" },
 143     { 0, NULL}
 144 };
 145
 146 struct slow_oam_link_event_t {
 147     nd_uint8_t event_type;
 148     nd_uint8_t event_length;
 149     nd_uint16_t time_stamp;
 150     nd_uint64_t window;
 151     nd_uint64_t threshold;
 152     nd_uint64_t errors;
 153     nd_uint64_t errors_running_total;
 154     nd_uint32_t event_running_total;
 155 };
 156
 157 struct slow_oam_variablerequest_t {
 158     nd_uint8_t branch;
 159     nd_uint16_t leaf;
 160 };
 161
 162 struct slow_oam_variableresponse_t {
 163     nd_uint8_t branch;
 164     nd_uint16_t leaf;
 165     nd_uint8_t length;
 166 };
 167
 168 struct slow_oam_loopbackctrl_t {
 169     nd_uint8_t command;
 170 };
 171
 172 static const struct tok slow_oam_loopbackctrl_cmd_values[] = {
 173     { 0x01, "Enable OAM Remote Loopback" },
 174     { 0x02, "Disable OAM Remote Loopback" },
 175     { 0, NULL}
 176 };
 177
 178 struct tlv_header_t {
 179     uint8_t type;
 180     uint8_t length;
 181 };
 182
 183 #define LACP_MARKER_TLV_TERMINATOR     0x00  /* same code for LACP and Marker */
 184
 185 #define LACP_TLV_ACTOR_INFO            0x01
 186 #define LACP_TLV_PARTNER_INFO          0x02
 187 #define LACP_TLV_COLLECTOR_INFO        0x03
 188
 189 #define MARKER_TLV_MARKER_INFO         0x01
 190
 191 static const struct tok slow_tlv_values[] = {
 192     { (SLOW_PROTO_LACP << 8) + LACP_MARKER_TLV_TERMINATOR, "Terminator"},
 193     { (SLOW_PROTO_LACP << 8) + LACP_TLV_ACTOR_INFO, "Actor Information"},
 194     { (SLOW_PROTO_LACP << 8) + LACP_TLV_PARTNER_INFO, "Partner Information"},
 195     { (SLOW_PROTO_LACP << 8) + LACP_TLV_COLLECTOR_INFO, "Collector Information"},
 196
 197     { (SLOW_PROTO_MARKER << 8) + LACP_MARKER_TLV_TERMINATOR, "Terminator"},
 198     { (SLOW_PROTO_MARKER << 8) + MARKER_TLV_MARKER_INFO, "Marker Information"},
 199     { 0, NULL}
 200 };
 201
 202 struct lacp_tlv_actor_partner_info_t {
 203     nd_uint16_t sys_pri;
 204     nd_mac_addr sys;
 205     nd_uint16_t key;
 206     nd_uint16_t port_pri;
 207     nd_uint16_t port;
 208     nd_uint8_t state;
 209     uint8_t pad[3];
 210 };
 211
 212 static const struct tok lacp_tlv_actor_partner_info_state_values[] = {
 213     { 0x01, "Activity"},
 214     { 0x02, "Timeout"},
 215     { 0x04, "Aggregation"},
 216     { 0x08, "Synchronization"},
 217     { 0x10, "Collecting"},
 218     { 0x20, "Distributing"},
 219     { 0x40, "Default"},
 220     { 0x80, "Expired"},
 221     { 0, NULL}
 222 };
 223
 224 struct lacp_tlv_collector_info_t {
 225     nd_uint16_t max_delay;
 226     uint8_t pad[12];
 227 };
 228
 229 struct marker_tlv_marker_info_t {
 230     nd_uint16_t req_port;
 231     nd_mac_addr req_sys;
 232     nd_uint32_t req_trans_id;
 233     uint8_t pad[2];
 234 };
 235
 236 struct lacp_marker_tlv_terminator_t {
 237     uint8_t pad[50];
 238 };
 239
 240 static void slow_marker_lacp_print(netdissect_options *, const u_char *, u_int, u_int);
 241 static void slow_oam_print(netdissect_options *, const u_char *, u_int);
 242
 243 void
 244 slow_print(netdissect_options *ndo,
 245            const u_char *pptr, u_int len)
 246 {
 247     int print_version;
 248     u_int subtype;
 249
 250     if (len < 1)
 251         goto tooshort;
 252     ND_TCHECK_1(pptr);
 253     subtype = EXTRACT_U_1(pptr);
 254
 255     /*
 256      * Sanity checking of the header.
 257      */
 258     switch (subtype) {
 259     case SLOW_PROTO_LACP:
 260         if (len < 2)
 261             goto tooshort;
 262         ND_TCHECK_1(pptr + 1);
 263         if (EXTRACT_U_1(pptr + 1) != LACP_VERSION) {
 264             ND_PRINT((ndo, "LACP version %u packet not supported", EXTRACT_U_1(pptr + 1)));
 265             return;
 266         }
 267         print_version = 1;
 268         break;
 269
 270     case SLOW_PROTO_MARKER:
 271         if (len < 2)
 272             goto tooshort;
 273         ND_TCHECK_1(pptr + 1);
 274         if (EXTRACT_U_1(pptr + 1) != MARKER_VERSION) {
 275             ND_PRINT((ndo, "MARKER version %u packet not supported", EXTRACT_U_1(pptr + 1)));
 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 == 1) {
 292         ND_PRINT((ndo, "%sv%u, length %u",
 293                tok2str(slow_proto_values, "unknown (%u)", subtype),
 294                EXTRACT_U_1((pptr + 1)),
 295                len));
 296     } else {
 297         /* some slow protos don't have a version number in the header */
 298         ND_PRINT((ndo, "%s, length %u",
 299                tok2str(slow_proto_values, "unknown (%u)", subtype),
 300                len));
 301     }
 302
 303     /* unrecognized subtype */
 304     if (print_version == -1) {
 305         print_unknown_data(ndo, pptr, "\n\t", len);
 306         return;
 307     }
 308
 309     if (!ndo->ndo_vflag)
 310         return;
 311
 312     switch (subtype) {
 313     default: /* should not happen */
 314         break;
 315
 316     case SLOW_PROTO_OAM:
 317         /* skip subtype */
 318         len -= 1;
 319         pptr += 1;
 320         slow_oam_print(ndo, pptr, len);
 321         break;
 322
 323     case SLOW_PROTO_LACP:   /* LACP and MARKER share the same semantics */
 324     case SLOW_PROTO_MARKER:
 325         /* skip subtype and version */
 326         len -= 2;
 327         pptr += 2;
 328         slow_marker_lacp_print(ndo, pptr, len, subtype);
 329         break;
 330     }
 331     return;
 332
 333 tooshort:
 334     if (!ndo->ndo_vflag)
 335         ND_PRINT((ndo, " (packet is too short)"));
 336     else
 337         ND_PRINT((ndo, "\n\t\t packet is too short"));
 338     return;
 339
 340 trunc:
 341     if (!ndo->ndo_vflag)
 342         ND_PRINT((ndo, " (packet exceeded snapshot)"));
 343     else
 344         ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
 345 }
 346
 347 static void
 348 slow_marker_lacp_print(netdissect_options *ndo,
 349                        const u_char *tptr, u_int tlen,
 350                        u_int proto_subtype)
 351 {
 352     const struct tlv_header_t *tlv_header;
 353     const u_char *tlv_tptr;
 354     u_int tlv_len, tlv_tlen;
 355
 356     union {
 357         const struct lacp_marker_tlv_terminator_t *lacp_marker_tlv_terminator;
 358         const struct lacp_tlv_actor_partner_info_t *lacp_tlv_actor_partner_info;
 359         const struct lacp_tlv_collector_info_t *lacp_tlv_collector_info;
 360         const struct marker_tlv_marker_info_t *marker_tlv_marker_info;
 361     } tlv_ptr;
 362
 363     while(tlen>0) {
 364         /* is the packet big enough to include the tlv header ? */
 365         if (tlen < sizeof(struct tlv_header_t))
 366             goto tooshort;
 367         /* did we capture enough for fully decoding the tlv header ? */
 368         ND_TCHECK_LEN(tptr, sizeof(struct tlv_header_t));
 369         tlv_header = (const struct tlv_header_t *)tptr;
 370         tlv_len = tlv_header->length;
 371
 372         ND_PRINT((ndo, "\n\t%s TLV (0x%02x), length %u",
 373                tok2str(slow_tlv_values,
 374                        "Unknown",
 375                        (proto_subtype << 8) + tlv_header->type),
 376                tlv_header->type,
 377                tlv_len));
 378
 379         if (tlv_header->type == LACP_MARKER_TLV_TERMINATOR) {
 380             /*
 381              * This TLV has a length of zero, and means there are no
 382              * more TLVs to process.
 383              */
 384             return;
 385         }
 386
 387         /* length includes the type and length fields */
 388         if (tlv_len < sizeof(struct tlv_header_t)) {
 389             ND_PRINT((ndo, "\n\t    ERROR: illegal length - should be >= %lu",
 390                    (unsigned long) sizeof(struct tlv_header_t)));
 391             return;
 392         }
 393
 394         /* is the packet big enough to include the tlv ? */
 395         if (tlen < tlv_len)
 396             goto tooshort;
 397         /* did we capture enough for fully decoding the tlv ? */
 398         ND_TCHECK_LEN(tptr, tlv_len);
 399
 400         tlv_tptr=tptr+sizeof(struct tlv_header_t);
 401         tlv_tlen=tlv_len-sizeof(struct tlv_header_t);
 402
 403         switch((proto_subtype << 8) + tlv_header->type) {
 404
 405             /* those two TLVs have the same structure -> fall through */
 406         case ((SLOW_PROTO_LACP << 8) + LACP_TLV_ACTOR_INFO):
 407         case ((SLOW_PROTO_LACP << 8) + LACP_TLV_PARTNER_INFO):
 408             if (tlv_tlen !=
 409                 sizeof(struct lacp_tlv_actor_partner_info_t)) {
 410                 ND_PRINT((ndo, "\n\t    ERROR: illegal length - should be %lu",
 411                        (unsigned long) (sizeof(struct tlv_header_t) + sizeof(struct lacp_tlv_actor_partner_info_t))));
 412                 goto badlength;
 413             }
 414
 415             tlv_ptr.lacp_tlv_actor_partner_info = (const struct lacp_tlv_actor_partner_info_t *)tlv_tptr;
 416
 417             ND_PRINT((ndo, "\n\t  System %s, System Priority %u, Key %u" \
 418                    ", Port %u, Port Priority %u\n\t  State Flags [%s]",
 419                    etheraddr_string(ndo, tlv_ptr.lacp_tlv_actor_partner_info->sys),
 420                    EXTRACT_BE_U_2(tlv_ptr.lacp_tlv_actor_partner_info->sys_pri),
 421                    EXTRACT_BE_U_2(tlv_ptr.lacp_tlv_actor_partner_info->key),
 422                    EXTRACT_BE_U_2(tlv_ptr.lacp_tlv_actor_partner_info->port),
 423                    EXTRACT_BE_U_2(tlv_ptr.lacp_tlv_actor_partner_info->port_pri),
 424                    bittok2str(lacp_tlv_actor_partner_info_state_values,
 425                               "none",
 426                               EXTRACT_U_1(tlv_ptr.lacp_tlv_actor_partner_info->state))));
 427
 428             break;
 429
 430         case ((SLOW_PROTO_LACP << 8) + LACP_TLV_COLLECTOR_INFO):
 431             if (tlv_tlen !=
 432                 sizeof(struct lacp_tlv_collector_info_t)) {
 433                 ND_PRINT((ndo, "\n\t    ERROR: illegal length - should be %lu",
 434                        (unsigned long) (sizeof(struct tlv_header_t) + sizeof(struct lacp_tlv_collector_info_t))));
 435                 goto badlength;
 436             }
 437
 438             tlv_ptr.lacp_tlv_collector_info = (const struct lacp_tlv_collector_info_t *)tlv_tptr;
 439
 440             ND_PRINT((ndo, "\n\t  Max Delay %u",
 441                    EXTRACT_BE_U_2(tlv_ptr.lacp_tlv_collector_info->max_delay)));
 442
 443             break;
 444
 445         case ((SLOW_PROTO_MARKER << 8) + MARKER_TLV_MARKER_INFO):
 446             if (tlv_tlen !=
 447                 sizeof(struct marker_tlv_marker_info_t)) {
 448                 ND_PRINT((ndo, "\n\t    ERROR: illegal length - should be %lu",
 449                        (unsigned long) (sizeof(struct tlv_header_t) + sizeof(struct marker_tlv_marker_info_t))));
 450                 goto badlength;
 451             }
 452
 453             tlv_ptr.marker_tlv_marker_info = (const struct marker_tlv_marker_info_t *)tlv_tptr;
 454
 455             ND_PRINT((ndo, "\n\t  Request System %s, Request Port %u, Request Transaction ID 0x%08x",
 456                    etheraddr_string(ndo, tlv_ptr.marker_tlv_marker_info->req_sys),
 457                    EXTRACT_BE_U_2(tlv_ptr.marker_tlv_marker_info->req_port),
 458                    EXTRACT_BE_U_4(tlv_ptr.marker_tlv_marker_info->req_trans_id)));
 459
 460             break;
 461
 462         default:
 463             if (ndo->ndo_vflag <= 1)
 464                 print_unknown_data(ndo, tlv_tptr, "\n\t  ", tlv_tlen);
 465             break;
 466         }
 467
 468     badlength:
 469         /* do we want to see an additional hexdump ? */
 470         if (ndo->ndo_vflag > 1) {
 471             print_unknown_data(ndo, tptr+sizeof(struct tlv_header_t), "\n\t  ",
 472                                tlv_len-sizeof(struct tlv_header_t));
 473         }
 474
 475         tptr+=tlv_len;
 476         tlen-=tlv_len;
 477     }
 478     return;
 479
 480 tooshort:
 481     ND_PRINT((ndo, "\n\t\t packet is too short"));
 482     return;
 483
 484 trunc:
 485     ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
 486 }
 487
 488 static void
 489 slow_oam_print(netdissect_options *ndo,
 490                const u_char *tptr, u_int tlen)
 491 {
 492     uint8_t code;
 493     uint8_t type, length;
 494     uint8_t state;
 495     uint8_t command;
 496     u_int hexdump;
 497
 498     struct slow_oam_common_header_t {
 499         nd_uint16_t flags;
 500         nd_uint8_t code;
 501     };
 502
 503     struct slow_oam_tlv_header_t {
 504         nd_uint8_t type;
 505         nd_uint8_t length;
 506     };
 507
 508     union {
 509         const struct slow_oam_common_header_t *slow_oam_common_header;
 510         const struct slow_oam_tlv_header_t *slow_oam_tlv_header;
 511     } ptr;
 512
 513     union {
 514         const struct slow_oam_info_t *slow_oam_info;
 515         const struct slow_oam_link_event_t *slow_oam_link_event;
 516         const struct slow_oam_variablerequest_t *slow_oam_variablerequest;
 517         const struct slow_oam_variableresponse_t *slow_oam_variableresponse;
 518         const struct slow_oam_loopbackctrl_t *slow_oam_loopbackctrl;
 519     } tlv;
 520
 521     ptr.slow_oam_common_header = (const struct slow_oam_common_header_t *)tptr;
 522     if (tlen < sizeof(*ptr.slow_oam_common_header))
 523         goto tooshort;
 524     ND_TCHECK(*ptr.slow_oam_common_header);
 525     tptr += sizeof(struct slow_oam_common_header_t);
 526     tlen -= sizeof(struct slow_oam_common_header_t);
 527
 528     code = EXTRACT_U_1(ptr.slow_oam_common_header->code);
 529     ND_PRINT((ndo, "\n\tCode %s OAM PDU, Flags [%s]",
 530            tok2str(slow_oam_code_values, "Unknown (%u)", code),
 531            bittok2str(slow_oam_flag_values,
 532                       "none",
 533                       EXTRACT_BE_U_2(ptr.slow_oam_common_header->flags))));
 534
 535     switch (code) {
 536     case SLOW_OAM_CODE_INFO:
 537         while (tlen > 0) {
 538             ptr.slow_oam_tlv_header = (const struct slow_oam_tlv_header_t *)tptr;
 539             if (tlen < sizeof(*ptr.slow_oam_tlv_header))
 540                 goto tooshort;
 541             ND_TCHECK(*ptr.slow_oam_tlv_header);
 542             type = EXTRACT_U_1(ptr.slow_oam_tlv_header->type);
 543             length = EXTRACT_U_1(ptr.slow_oam_tlv_header->length);
 544             ND_PRINT((ndo, "\n\t  %s Information Type (%u), length %u",
 545                    tok2str(slow_oam_info_type_values, "Reserved", type),
 546                    type,
 547                    length));
 548
 549             if (type == SLOW_OAM_INFO_TYPE_END_OF_TLV) {
 550                 /*
 551                  * As IEEE Std 802.3-2015 says for the End of TLV Marker,
 552                  * "(the length and value of the Type 0x00 TLV can be ignored)".
 553                  */
 554                 return;
 555             }
 556
 557             /* length includes the type and length fields */
 558             if (length < sizeof(struct slow_oam_tlv_header_t)) {
 559                 ND_PRINT((ndo, "\n\t    ERROR: illegal length - should be >= %u",
 560                        (u_int)sizeof(struct slow_oam_tlv_header_t)));
 561                 return;
 562             }
 563
 564             if (tlen < length)
 565                 goto tooshort;
 566             ND_TCHECK_LEN(tptr, length);
 567
 568             hexdump = FALSE;
 569             switch (type) {
 570             case SLOW_OAM_INFO_TYPE_LOCAL: /* identical format - fall through */
 571             case SLOW_OAM_INFO_TYPE_REMOTE:
 572                 tlv.slow_oam_info = (const struct slow_oam_info_t *)tptr;
 573
 574                 if (EXTRACT_U_1(tlv.slow_oam_info->info_length) !=
 575                     sizeof(struct slow_oam_info_t)) {
 576                     ND_PRINT((ndo, "\n\t    ERROR: illegal length - should be %lu",
 577                            (unsigned long) sizeof(struct slow_oam_info_t)));
 578                     hexdump = TRUE;
 579                     goto badlength_code_info;
 580                 }
 581
 582                 ND_PRINT((ndo, "\n\t    OAM-Version %u, Revision %u",
 583                        EXTRACT_U_1(tlv.slow_oam_info->oam_version),
 584                        EXTRACT_BE_U_2(tlv.slow_oam_info->revision)));
 585
 586                 state = EXTRACT_U_1(tlv.slow_oam_info->state);
 587                 ND_PRINT((ndo, "\n\t    State-Parser-Action %s, State-MUX-Action %s",
 588                        tok2str(slow_oam_info_type_state_parser_values, "Reserved",
 589                                state & OAM_INFO_TYPE_PARSER_MASK),
 590                        tok2str(slow_oam_info_type_state_mux_values, "Reserved",
 591                                state & OAM_INFO_TYPE_MUX_MASK)));
 592                 ND_PRINT((ndo, "\n\t    OAM-Config Flags [%s], OAM-PDU-Config max-PDU size %u",
 593                        bittok2str(slow_oam_info_type_oam_config_values, "none",
 594                                   EXTRACT_U_1(tlv.slow_oam_info->oam_config)),
 595                        EXTRACT_BE_U_2(tlv.slow_oam_info->oam_pdu_config) &
 596                        OAM_INFO_TYPE_PDU_SIZE_MASK));
 597                 ND_PRINT((ndo, "\n\t    OUI %s (0x%06x), Vendor-Private 0x%08x",
 598                        tok2str(oui_values, "Unknown",
 599                                EXTRACT_BE_U_3(tlv.slow_oam_info->oui)),
 600                        EXTRACT_BE_U_3(tlv.slow_oam_info->oui),
 601                        EXTRACT_BE_U_4(tlv.slow_oam_info->vendor_private)));
 602                 break;
 603
 604             case SLOW_OAM_INFO_TYPE_ORG_SPECIFIC:
 605                 hexdump = TRUE;
 606                 break;
 607
 608             default:
 609                 hexdump = TRUE;
 610                 break;
 611             }
 612
 613         badlength_code_info:
 614             /* do we also want to see a hex dump ? */
 615             if (ndo->ndo_vflag > 1 || hexdump==TRUE) {
 616                 print_unknown_data(ndo, tptr, "\n\t  ",
 617                                    length);
 618             }
 619
 620             tlen -= length;
 621             tptr += length;
 622         }
 623         break;
 624
 625     case SLOW_OAM_CODE_EVENT_NOTIF:
 626         /* Sequence number */
 627         if (tlen < 2)
 628             goto tooshort;
 629         ND_TCHECK_2(tptr);
 630         ND_PRINT((ndo, "\n\t  Sequence Number %u", EXTRACT_BE_U_2(tptr)));
 631         tlen -= 2;
 632         tptr += 2;
 633
 634         /* TLVs */
 635         while (tlen > 0) {
 636             ptr.slow_oam_tlv_header = (const struct slow_oam_tlv_header_t *)tptr;
 637             if (tlen < sizeof(*ptr.slow_oam_tlv_header))
 638                 goto tooshort;
 639             ND_TCHECK(*ptr.slow_oam_tlv_header);
 640             type = EXTRACT_U_1(ptr.slow_oam_tlv_header->type);
 641             length = EXTRACT_U_1(ptr.slow_oam_tlv_header->length);
 642             ND_PRINT((ndo, "\n\t  %s Link Event Type (%u), length %u",
 643                    tok2str(slow_oam_link_event_values, "Reserved",
 644                            type),
 645                    type,
 646                    length));
 647
 648             if (type == SLOW_OAM_INFO_TYPE_END_OF_TLV) {
 649                 /*
 650                  * As IEEE Std 802.3-2015 says for the End of TLV Marker,
 651                  * "(the length and value of the Type 0x00 TLV can be ignored)".
 652                  */
 653                 return;
 654             }
 655
 656             /* length includes the type and length fields */
 657             if (length < sizeof(struct slow_oam_tlv_header_t)) {
 658                 ND_PRINT((ndo, "\n\t    ERROR: illegal length - should be >= %u",
 659                        (u_int)sizeof(struct slow_oam_tlv_header_t)));
 660                 return;
 661             }
 662
 663             if (tlen < length)
 664                 goto tooshort;
 665             ND_TCHECK_LEN(tptr, length);
 666
 667             hexdump = FALSE;
 668             switch (type) {
 669             case SLOW_OAM_LINK_EVENT_ERR_SYM_PER: /* identical format - fall through */
 670             case SLOW_OAM_LINK_EVENT_ERR_FRM:
 671             case SLOW_OAM_LINK_EVENT_ERR_FRM_PER:
 672             case SLOW_OAM_LINK_EVENT_ERR_FRM_SUMM:
 673                 tlv.slow_oam_link_event = (const struct slow_oam_link_event_t *)tptr;
 674
 675                 if (EXTRACT_U_1(tlv.slow_oam_link_event->event_length) !=
 676                     sizeof(struct slow_oam_link_event_t)) {
 677                     ND_PRINT((ndo, "\n\t    ERROR: illegal length - should be %lu",
 678                            (unsigned long) sizeof(struct slow_oam_link_event_t)));
 679                     hexdump = TRUE;
 680                     goto badlength_event_notif;
 681                 }
 682
 683                 ND_PRINT((ndo, "\n\t    Timestamp %u ms, Errored Window %" PRIu64
 684                        "\n\t    Errored Threshold %" PRIu64
 685                        "\n\t    Errors %" PRIu64
 686                        "\n\t    Error Running Total %" PRIu64
 687                        "\n\t    Event Running Total %u",
 688                        EXTRACT_BE_U_2(tlv.slow_oam_link_event->time_stamp)*100,
 689                        EXTRACT_BE_U_8(tlv.slow_oam_link_event->window),
 690                        EXTRACT_BE_U_8(tlv.slow_oam_link_event->threshold),
 691                        EXTRACT_BE_U_8(tlv.slow_oam_link_event->errors),
 692                        EXTRACT_BE_U_8(tlv.slow_oam_link_event->errors_running_total),
 693                        EXTRACT_BE_U_4(tlv.slow_oam_link_event->event_running_total)));
 694                 break;
 695
 696             case SLOW_OAM_LINK_EVENT_ORG_SPECIFIC:
 697                 hexdump = TRUE;
 698                 break;
 699
 700             default:
 701                 hexdump = TRUE;
 702                 break;
 703             }
 704
 705         badlength_event_notif:
 706             /* do we also want to see a hex dump ? */
 707             if (ndo->ndo_vflag > 1 || hexdump==TRUE) {
 708                 print_unknown_data(ndo, tptr, "\n\t  ",
 709                                    length);
 710             }
 711
 712             tlen -= length;
 713             tptr += length;
 714         }
 715         break;
 716
 717     case SLOW_OAM_CODE_LOOPBACK_CTRL:
 718         tlv.slow_oam_loopbackctrl = (const struct slow_oam_loopbackctrl_t *)tptr;
 719         if (tlen < sizeof(*tlv.slow_oam_loopbackctrl))
 720             goto tooshort;
 721         ND_TCHECK(*tlv.slow_oam_loopbackctrl);
 722         command = EXTRACT_U_1(tlv.slow_oam_loopbackctrl->command);
 723         ND_PRINT((ndo, "\n\t  Command %s (%u)",
 724                tok2str(slow_oam_loopbackctrl_cmd_values,
 725                        "Unknown",
 726                        command),
 727                command));
 728         tptr ++;
 729         tlen --;
 730         break;
 731
 732         /*
 733          * FIXME those are the defined codes that lack a decoder
 734          * you are welcome to contribute code ;-)
 735          */
 736     case SLOW_OAM_CODE_VAR_REQUEST:
 737     case SLOW_OAM_CODE_VAR_RESPONSE:
 738     case SLOW_OAM_CODE_PRIVATE:
 739     default:
 740         if (ndo->ndo_vflag <= 1) {
 741             print_unknown_data(ndo, tptr, "\n\t  ", tlen);
 742         }
 743         break;
 744     }
 745     return;
 746
 747 tooshort:
 748     ND_PRINT((ndo, "\n\t\t packet is too short"));
 749     return;
 750
 751 trunc:
 752     ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
 753 }