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     ND_TCHECK_1(pptr);
 255     subtype = GET_U_1(pptr);
 256
 257     /*
 258      * Sanity checking of the header.
 259      */
 260     switch (subtype) {
 261     case SLOW_PROTO_LACP:
 262         if (len < 2)
 263             goto tooshort;
 264         ND_TCHECK_1(pptr + 1);
 265         if (GET_U_1(pptr + 1) != LACP_VERSION) {
 266             ND_PRINT("LACP version %u packet not supported",
 267                      GET_U_1(pptr + 1));
 268             return;
 269         }
 270         print_version = 1;
 271         break;
 272
 273     case SLOW_PROTO_MARKER:
 274         if (len < 2)
 275             goto tooshort;
 276         ND_TCHECK_1(pptr + 1);
 277         if (GET_U_1(pptr + 1) != MARKER_VERSION) {
 278             ND_PRINT("MARKER version %u packet not supported",
 279                      GET_U_1(pptr + 1));
 280             return;
 281         }
 282         print_version = 1;
 283         break;
 284
 285     case SLOW_PROTO_OAM: /* fall through */
 286         print_version = 0;
 287         break;
 288
 289     default:
 290         /* print basic information and exit */
 291         print_version = -1;
 292         break;
 293     }
 294
 295     if (print_version == 1) {
 296         ND_PRINT("%sv%u, length %u",
 297                tok2str(slow_proto_values, "unknown (%u)", subtype),
 298                GET_U_1((pptr + 1)),
 299                len);
 300     } else {
 301         /* some slow protos don't have a version number in the header */
 302         ND_PRINT("%s, length %u",
 303                tok2str(slow_proto_values, "unknown (%u)", subtype),
 304                len);
 305     }
 306
 307     /* unrecognized subtype */
 308     if (print_version == -1) {
 309         print_unknown_data(ndo, pptr, "\n\t", len);
 310         return;
 311     }
 312
 313     if (!ndo->ndo_vflag)
 314         return;
 315
 316     switch (subtype) {
 317     default: /* should not happen */
 318         break;
 319
 320     case SLOW_PROTO_OAM:
 321         /* skip subtype */
 322         len -= 1;
 323         pptr += 1;
 324         slow_oam_print(ndo, pptr, len);
 325         break;
 326
 327     case SLOW_PROTO_LACP:   /* LACP and MARKER share the same semantics */
 328     case SLOW_PROTO_MARKER:
 329         /* skip subtype and version */
 330         len -= 2;
 331         pptr += 2;
 332         slow_marker_lacp_print(ndo, pptr, len, subtype);
 333         break;
 334     }
 335     return;
 336
 337 tooshort:
 338     if (!ndo->ndo_vflag)
 339         ND_PRINT(" (packet is too short)");
 340     else
 341         ND_PRINT("\n\t\t packet is too short");
 342     return;
 343
 344 trunc:
 345     nd_print_trunc(ndo);
 346 }
 347
 348 static void
 349 slow_marker_lacp_print(netdissect_options *ndo,
 350                        const u_char *tptr, u_int tlen,
 351                        u_int proto_subtype)
 352 {
 353     const struct tlv_header_t *tlv_header;
 354     const u_char *tlv_tptr;
 355     u_int tlv_type, tlv_len, tlv_tlen;
 356
 357     union {
 358         const struct lacp_marker_tlv_terminator_t *lacp_marker_tlv_terminator;
 359         const struct lacp_tlv_actor_partner_info_t *lacp_tlv_actor_partner_info;
 360         const struct lacp_tlv_collector_info_t *lacp_tlv_collector_info;
 361         const struct marker_tlv_marker_info_t *marker_tlv_marker_info;
 362     } tlv_ptr;
 363
 364     while(tlen>0) {
 365         /* is the packet big enough to include the tlv header ? */
 366         if (tlen < sizeof(struct tlv_header_t))
 367             goto tooshort;
 368         /* did we capture enough for fully decoding the tlv header ? */
 369         ND_TCHECK_LEN(tptr, sizeof(struct tlv_header_t));
 370         tlv_header = (const struct tlv_header_t *)tptr;
 371         tlv_type = GET_U_1(tlv_header->type);
 372         tlv_len = GET_U_1(tlv_header->length);
 373
 374         ND_PRINT("\n\t%s TLV (0x%02x), length %u",
 375                tok2str(slow_tlv_values,
 376                        "Unknown",
 377                        (proto_subtype << 8) + tlv_type),
 378                tlv_type,
 379                tlv_len);
 380
 381         if (tlv_type == LACP_MARKER_TLV_TERMINATOR) {
 382             /*
 383              * This TLV has a length of zero, and means there are no
 384              * more TLVs to process.
 385              */
 386             return;
 387         }
 388
 389         /* length includes the type and length fields */
 390         if (tlv_len < sizeof(struct tlv_header_t)) {
 391             ND_PRINT("\n\t    ERROR: illegal length - should be >= %zu",
 392                    sizeof(struct tlv_header_t));
 393             return;
 394         }
 395
 396         /* is the packet big enough to include the tlv ? */
 397         if (tlen < tlv_len)
 398             goto tooshort;
 399         /* did we capture enough for fully decoding the tlv ? */
 400         ND_TCHECK_LEN(tptr, tlv_len);
 401
 402         tlv_tptr=tptr+sizeof(struct tlv_header_t);
 403         tlv_tlen=tlv_len-sizeof(struct tlv_header_t);
 404
 405         switch((proto_subtype << 8) + tlv_type) {
 406
 407             /* those two TLVs have the same structure -> fall through */
 408         case ((SLOW_PROTO_LACP << 8) + LACP_TLV_ACTOR_INFO):
 409         case ((SLOW_PROTO_LACP << 8) + LACP_TLV_PARTNER_INFO):
 410             if (tlv_tlen !=
 411                 sizeof(struct lacp_tlv_actor_partner_info_t)) {
 412                 ND_PRINT("\n\t    ERROR: illegal length - should be %zu",
 413                        sizeof(struct tlv_header_t) + sizeof(struct lacp_tlv_actor_partner_info_t));
 414                 goto badlength;
 415             }
 416
 417             tlv_ptr.lacp_tlv_actor_partner_info = (const struct lacp_tlv_actor_partner_info_t *)tlv_tptr;
 418
 419             ND_PRINT("\n\t  System %s, System Priority %u, Key %u"
 420                    ", Port %u, Port Priority %u\n\t  State Flags [%s]",
 421                    GET_ETHERADDR_STRING(tlv_ptr.lacp_tlv_actor_partner_info->sys),
 422                    GET_BE_U_2(tlv_ptr.lacp_tlv_actor_partner_info->sys_pri),
 423                    GET_BE_U_2(tlv_ptr.lacp_tlv_actor_partner_info->key),
 424                    GET_BE_U_2(tlv_ptr.lacp_tlv_actor_partner_info->port),
 425                    GET_BE_U_2(tlv_ptr.lacp_tlv_actor_partner_info->port_pri),
 426                    bittok2str(lacp_tlv_actor_partner_info_state_values,
 427                               "none",
 428                               GET_U_1(tlv_ptr.lacp_tlv_actor_partner_info->state)));
 429
 430             break;
 431
 432         case ((SLOW_PROTO_LACP << 8) + LACP_TLV_COLLECTOR_INFO):
 433             if (tlv_tlen !=
 434                 sizeof(struct lacp_tlv_collector_info_t)) {
 435                 ND_PRINT("\n\t    ERROR: illegal length - should be %zu",
 436                        sizeof(struct tlv_header_t) + sizeof(struct lacp_tlv_collector_info_t));
 437                 goto badlength;
 438             }
 439
 440             tlv_ptr.lacp_tlv_collector_info = (const struct lacp_tlv_collector_info_t *)tlv_tptr;
 441
 442             ND_PRINT("\n\t  Max Delay %u",
 443                    GET_BE_U_2(tlv_ptr.lacp_tlv_collector_info->max_delay));
 444
 445             break;
 446
 447         case ((SLOW_PROTO_MARKER << 8) + MARKER_TLV_MARKER_INFO):
 448             if (tlv_tlen !=
 449                 sizeof(struct marker_tlv_marker_info_t)) {
 450                 ND_PRINT("\n\t    ERROR: illegal length - should be %zu",
 451                        sizeof(struct tlv_header_t) + sizeof(struct marker_tlv_marker_info_t));
 452                 goto badlength;
 453             }
 454
 455             tlv_ptr.marker_tlv_marker_info = (const struct marker_tlv_marker_info_t *)tlv_tptr;
 456
 457             ND_PRINT("\n\t  Request System %s, Request Port %u, Request Transaction ID 0x%08x",
 458                    GET_ETHERADDR_STRING(tlv_ptr.marker_tlv_marker_info->req_sys),
 459                    GET_BE_U_2(tlv_ptr.marker_tlv_marker_info->req_port),
 460                    GET_BE_U_4(tlv_ptr.marker_tlv_marker_info->req_trans_id));
 461
 462             break;
 463
 464         default:
 465             if (ndo->ndo_vflag <= 1)
 466                 print_unknown_data(ndo, tlv_tptr, "\n\t  ", tlv_tlen);
 467             break;
 468         }
 469
 470     badlength:
 471         /* do we want to see an additional hexdump ? */
 472         if (ndo->ndo_vflag > 1) {
 473             print_unknown_data(ndo, tptr+sizeof(struct tlv_header_t), "\n\t  ",
 474                                tlv_len-sizeof(struct tlv_header_t));
 475         }
 476
 477         tptr+=tlv_len;
 478         tlen-=tlv_len;
 479     }
 480     return;
 481
 482 tooshort:
 483     ND_PRINT("\n\t\t packet is too short");
 484     return;
 485
 486 trunc:
 487     nd_print_trunc(ndo);
 488 }
 489
 490 static void
 491 slow_oam_print(netdissect_options *ndo,
 492                const u_char *tptr, u_int tlen)
 493 {
 494     uint8_t code;
 495     uint8_t type, length;
 496     uint8_t state;
 497     uint8_t command;
 498     u_int hexdump;
 499
 500     struct slow_oam_common_header_t {
 501         nd_uint16_t flags;
 502         nd_uint8_t code;
 503     };
 504
 505     struct slow_oam_tlv_header_t {
 506         nd_uint8_t type;
 507         nd_uint8_t length;
 508     };
 509
 510     union {
 511         const struct slow_oam_common_header_t *slow_oam_common_header;
 512         const struct slow_oam_tlv_header_t *slow_oam_tlv_header;
 513     } ptr;
 514
 515     union {
 516         const struct slow_oam_info_t *slow_oam_info;
 517         const struct slow_oam_link_event_t *slow_oam_link_event;
 518         const struct slow_oam_variablerequest_t *slow_oam_variablerequest;
 519         const struct slow_oam_variableresponse_t *slow_oam_variableresponse;
 520         const struct slow_oam_loopbackctrl_t *slow_oam_loopbackctrl;
 521     } tlv;
 522
 523     ptr.slow_oam_common_header = (const struct slow_oam_common_header_t *)tptr;
 524     if (tlen < sizeof(*ptr.slow_oam_common_header))
 525         goto tooshort;
 526     ND_TCHECK_SIZE(ptr.slow_oam_common_header);
 527     tptr += sizeof(struct slow_oam_common_header_t);
 528     tlen -= sizeof(struct slow_oam_common_header_t);
 529
 530     code = GET_U_1(ptr.slow_oam_common_header->code);
 531     ND_PRINT("\n\tCode %s OAM PDU, Flags [%s]",
 532            tok2str(slow_oam_code_values, "Unknown (%u)", code),
 533            bittok2str(slow_oam_flag_values,
 534                       "none",
 535                       GET_BE_U_2(ptr.slow_oam_common_header->flags)));
 536
 537     switch (code) {
 538     case SLOW_OAM_CODE_INFO:
 539         while (tlen > 0) {
 540             ptr.slow_oam_tlv_header = (const struct slow_oam_tlv_header_t *)tptr;
 541             if (tlen < sizeof(*ptr.slow_oam_tlv_header))
 542                 goto tooshort;
 543             ND_TCHECK_SIZE(ptr.slow_oam_tlv_header);
 544             type = GET_U_1(ptr.slow_oam_tlv_header->type);
 545             length = GET_U_1(ptr.slow_oam_tlv_header->length);
 546             ND_PRINT("\n\t  %s Information Type (%u), length %u",
 547                    tok2str(slow_oam_info_type_values, "Reserved", type),
 548                    type,
 549                    length);
 550
 551             if (type == SLOW_OAM_INFO_TYPE_END_OF_TLV) {
 552                 /*
 553                  * As IEEE Std 802.3-2015 says for the End of TLV Marker,
 554                  * "(the length and value of the Type 0x00 TLV can be ignored)".
 555                  */
 556                 return;
 557             }
 558
 559             /* length includes the type and length fields */
 560             if (length < sizeof(struct slow_oam_tlv_header_t)) {
 561                 ND_PRINT("\n\t    ERROR: illegal length - should be >= %u",
 562                        (u_int)sizeof(struct slow_oam_tlv_header_t));
 563                 return;
 564             }
 565
 566             if (tlen < length)
 567                 goto tooshort;
 568             ND_TCHECK_LEN(tptr, length);
 569
 570             hexdump = FALSE;
 571             switch (type) {
 572             case SLOW_OAM_INFO_TYPE_LOCAL: /* identical format - fall through */
 573             case SLOW_OAM_INFO_TYPE_REMOTE:
 574                 tlv.slow_oam_info = (const struct slow_oam_info_t *)tptr;
 575
 576                 if (GET_U_1(tlv.slow_oam_info->info_length) !=
 577                     sizeof(struct slow_oam_info_t)) {
 578                     ND_PRINT("\n\t    ERROR: illegal length - should be %zu",
 579                            sizeof(struct slow_oam_info_t));
 580                     hexdump = TRUE;
 581                     goto badlength_code_info;
 582                 }
 583
 584                 ND_PRINT("\n\t    OAM-Version %u, Revision %u",
 585                        GET_U_1(tlv.slow_oam_info->oam_version),
 586                        GET_BE_U_2(tlv.slow_oam_info->revision));
 587
 588                 state = GET_U_1(tlv.slow_oam_info->state);
 589                 ND_PRINT("\n\t    State-Parser-Action %s, State-MUX-Action %s",
 590                        tok2str(slow_oam_info_type_state_parser_values, "Reserved",
 591                                state & OAM_INFO_TYPE_PARSER_MASK),
 592                        tok2str(slow_oam_info_type_state_mux_values, "Reserved",
 593                                state & OAM_INFO_TYPE_MUX_MASK));
 594                 ND_PRINT("\n\t    OAM-Config Flags [%s], OAM-PDU-Config max-PDU size %u",
 595                        bittok2str(slow_oam_info_type_oam_config_values, "none",
 596                                   GET_U_1(tlv.slow_oam_info->oam_config)),
 597                        GET_BE_U_2(tlv.slow_oam_info->oam_pdu_config) &
 598                        OAM_INFO_TYPE_PDU_SIZE_MASK);
 599                 ND_PRINT("\n\t    OUI %s (0x%06x), Vendor-Private 0x%08x",
 600                        tok2str(oui_values, "Unknown",
 601                                GET_BE_U_3(tlv.slow_oam_info->oui)),
 602                        GET_BE_U_3(tlv.slow_oam_info->oui),
 603                        GET_BE_U_4(tlv.slow_oam_info->vendor_private));
 604                 break;
 605
 606             case SLOW_OAM_INFO_TYPE_ORG_SPECIFIC:
 607                 hexdump = TRUE;
 608                 break;
 609
 610             default:
 611                 hexdump = TRUE;
 612                 break;
 613             }
 614
 615         badlength_code_info:
 616             /* do we also want to see a hex dump ? */
 617             if (ndo->ndo_vflag > 1 || hexdump==TRUE) {
 618                 print_unknown_data(ndo, tptr, "\n\t  ",
 619                                    length);
 620             }
 621
 622             tlen -= length;
 623             tptr += length;
 624         }
 625         break;
 626
 627     case SLOW_OAM_CODE_EVENT_NOTIF:
 628         /* Sequence number */
 629         if (tlen < 2)
 630             goto tooshort;
 631         ND_TCHECK_2(tptr);
 632         ND_PRINT("\n\t  Sequence Number %u", GET_BE_U_2(tptr));
 633         tlen -= 2;
 634         tptr += 2;
 635
 636         /* TLVs */
 637         while (tlen > 0) {
 638             ptr.slow_oam_tlv_header = (const struct slow_oam_tlv_header_t *)tptr;
 639             if (tlen < sizeof(*ptr.slow_oam_tlv_header))
 640                 goto tooshort;
 641             ND_TCHECK_SIZE(ptr.slow_oam_tlv_header);
 642             type = GET_U_1(ptr.slow_oam_tlv_header->type);
 643             length = GET_U_1(ptr.slow_oam_tlv_header->length);
 644             ND_PRINT("\n\t  %s Link Event Type (%u), length %u",
 645                    tok2str(slow_oam_link_event_values, "Reserved",
 646                            type),
 647                    type,
 648                    length);
 649
 650             if (type == SLOW_OAM_INFO_TYPE_END_OF_TLV) {
 651                 /*
 652                  * As IEEE Std 802.3-2015 says for the End of TLV Marker,
 653                  * "(the length and value of the Type 0x00 TLV can be ignored)".
 654                  */
 655                 return;
 656             }
 657
 658             /* length includes the type and length fields */
 659             if (length < sizeof(struct slow_oam_tlv_header_t)) {
 660                 ND_PRINT("\n\t    ERROR: illegal length - should be >= %u",
 661                        (u_int)sizeof(struct slow_oam_tlv_header_t));
 662                 return;
 663             }
 664
 665             if (tlen < length)
 666                 goto tooshort;
 667             ND_TCHECK_LEN(tptr, length);
 668
 669             hexdump = FALSE;
 670             switch (type) {
 671             case SLOW_OAM_LINK_EVENT_ERR_SYM_PER: /* identical format - fall through */
 672             case SLOW_OAM_LINK_EVENT_ERR_FRM:
 673             case SLOW_OAM_LINK_EVENT_ERR_FRM_PER:
 674             case SLOW_OAM_LINK_EVENT_ERR_FRM_SUMM:
 675                 tlv.slow_oam_link_event = (const struct slow_oam_link_event_t *)tptr;
 676
 677                 if (GET_U_1(tlv.slow_oam_link_event->event_length) !=
 678                     sizeof(struct slow_oam_link_event_t)) {
 679                     ND_PRINT("\n\t    ERROR: illegal length - should be %zu",
 680                            sizeof(struct slow_oam_link_event_t));
 681                     hexdump = TRUE;
 682                     goto badlength_event_notif;
 683                 }
 684
 685                 ND_PRINT("\n\t    Timestamp %u ms, Errored Window %" PRIu64
 686                        "\n\t    Errored Threshold %" PRIu64
 687                        "\n\t    Errors %" PRIu64
 688                        "\n\t    Error Running Total %" PRIu64
 689                        "\n\t    Event Running Total %u",
 690                        GET_BE_U_2(tlv.slow_oam_link_event->time_stamp)*100,
 691                        GET_BE_U_8(tlv.slow_oam_link_event->window),
 692                        GET_BE_U_8(tlv.slow_oam_link_event->threshold),
 693                        GET_BE_U_8(tlv.slow_oam_link_event->errors),
 694                        GET_BE_U_8(tlv.slow_oam_link_event->errors_running_total),
 695                        GET_BE_U_4(tlv.slow_oam_link_event->event_running_total));
 696                 break;
 697
 698             case SLOW_OAM_LINK_EVENT_ORG_SPECIFIC:
 699                 hexdump = TRUE;
 700                 break;
 701
 702             default:
 703                 hexdump = TRUE;
 704                 break;
 705             }
 706
 707         badlength_event_notif:
 708             /* do we also want to see a hex dump ? */
 709             if (ndo->ndo_vflag > 1 || hexdump==TRUE) {
 710                 print_unknown_data(ndo, tptr, "\n\t  ",
 711                                    length);
 712             }
 713
 714             tlen -= length;
 715             tptr += length;
 716         }
 717         break;
 718
 719     case SLOW_OAM_CODE_LOOPBACK_CTRL:
 720         tlv.slow_oam_loopbackctrl = (const struct slow_oam_loopbackctrl_t *)tptr;
 721         if (tlen < sizeof(*tlv.slow_oam_loopbackctrl))
 722             goto tooshort;
 723         ND_TCHECK_SIZE(tlv.slow_oam_loopbackctrl);
 724         command = GET_U_1(tlv.slow_oam_loopbackctrl->command);
 725         ND_PRINT("\n\t  Command %s (%u)",
 726                tok2str(slow_oam_loopbackctrl_cmd_values,
 727                        "Unknown",
 728                        command),
 729                command);
 730         tptr ++;
 731         tlen --;
 732         break;
 733
 734         /*
 735          * FIXME those are the defined codes that lack a decoder
 736          * you are welcome to contribute code ;-)
 737          */
 738     case SLOW_OAM_CODE_VAR_REQUEST:
 739     case SLOW_OAM_CODE_VAR_RESPONSE:
 740     case SLOW_OAM_CODE_PRIVATE:
 741     default:
 742         if (ndo->ndo_vflag <= 1) {
 743             print_unknown_data(ndo, tptr, "\n\t  ", tlen);
 744         }
 745         break;
 746     }
 747     return;
 748
 749 tooshort:
 750     ND_PRINT("\n\t\t packet is too short");
 751     return;
 752
 753 trunc:
 754     nd_print_trunc(ndo);
 755 }