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 "ether.h"
  33 #include "oui.h"
  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     uint8_t info_type;
  79     uint8_t info_length;
  80     uint8_t oam_version;
  81     uint8_t revision[2];
  82     uint8_t state;
  83     uint8_t oam_config;
  84     uint8_t oam_pdu_config[2];
  85     uint8_t oui[3];
  86     uint8_t vendor_private[4];
  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     uint8_t event_type;
 149     uint8_t event_length;
 150     uint8_t time_stamp[2];
 151     uint8_t window[8];
 152     uint8_t threshold[8];
 153     uint8_t errors[8];
 154     uint8_t errors_running_total[8];
 155     uint8_t event_running_total[4];
 156 };
 157
 158 struct slow_oam_variablerequest_t {
 159     uint8_t branch;
 160     uint8_t leaf[2];
 161 };
 162
 163 struct slow_oam_variableresponse_t {
 164     uint8_t branch;
 165     uint8_t leaf[2];
 166     uint8_t length;
 167 };
 168
 169 struct slow_oam_loopbackctrl_t {
 170     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     uint8_t type;
 181     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     uint8_t sys_pri[2];
 205     uint8_t sys[ETHER_ADDR_LEN];
 206     uint8_t key[2];
 207     uint8_t port_pri[2];
 208     uint8_t port[2];
 209     uint8_t state;
 210     uint8_t 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     uint8_t max_delay[2];
 227     uint8_t pad[12];
 228 };
 229
 230 struct marker_tlv_marker_info_t {
 231     uint8_t req_port[2];
 232     uint8_t req_sys[ETHER_ADDR_LEN];
 233     uint8_t req_trans_id[4];
 234     uint8_t pad[2];
 235 };
 236
 237 struct lacp_marker_tlv_terminator_t {
 238     uint8_t pad[50];
 239 };
 240
 241 static void slow_marker_lacp_print(netdissect_options *, register const u_char *, register u_int, u_int);
 242 static void slow_oam_print(netdissect_options *, register const u_char *, register u_int);
 243
 244 void
 245 slow_print(netdissect_options *ndo,
 246            register const u_char *pptr, register u_int len)
 247 {
 248     int print_version;
 249     u_int subtype;
 250
 251     if (len < 1)
 252         goto tooshort;
 253     ND_TCHECK(*pptr);
 254     subtype = *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         ND_TCHECK(*(pptr+1));
 264         if (*(pptr+1) != LACP_VERSION) {
 265             ND_PRINT((ndo, "LACP version %u packet not supported", *(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         ND_TCHECK(*(pptr+1));
 275         if (*(pptr+1) != MARKER_VERSION) {
 276             ND_PRINT((ndo, "MARKER version %u packet not supported", *(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((ndo, "%sv%u, length %u",
 294                tok2str(slow_proto_values, "unknown (%u)", subtype),
 295                *(pptr+1),
 296                len));
 297     } else {
 298         /* some slow protos don't have a version number in the header */
 299         ND_PRINT((ndo, "%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((ndo, " (packet is too short)"));
 337     else
 338         ND_PRINT((ndo, "\n\t\t packet is too short"));
 339     return;
 340
 341 trunc:
 342     if (!ndo->ndo_vflag)
 343         ND_PRINT((ndo, " (packet exceeded snapshot)"));
 344     else
 345         ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
 346 }
 347
 348 static void
 349 slow_marker_lacp_print(netdissect_options *ndo,
 350                        register const u_char *tptr, register 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_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_TCHECK2(*tptr, sizeof(struct tlv_header_t));
 370         tlv_header = (const struct tlv_header_t *)tptr;
 371         tlv_len = tlv_header->length;
 372
 373         ND_PRINT((ndo, "\n\t%s TLV (0x%02x), length %u",
 374                tok2str(slow_tlv_values,
 375                        "Unknown",
 376                        (proto_subtype << 8) + tlv_header->type),
 377                tlv_header->type,
 378                tlv_len));
 379
 380         if (tlv_header->type == LACP_MARKER_TLV_TERMINATOR) {
 381             /*
 382              * This TLV has a length of zero, and means there are no
 383              * more TLVs to process.
 384              */
 385             return;
 386         }
 387
 388         /* length includes the type and length fields */
 389         if (tlv_len < sizeof(struct tlv_header_t)) {
 390             ND_PRINT((ndo, "\n\t    ERROR: illegal length - should be >= %lu",
 391                    (unsigned long) sizeof(struct tlv_header_t)));
 392             return;
 393         }
 394
 395         /* is the packet big enough to include the tlv ? */
 396         if (tlen < tlv_len)
 397             goto tooshort;
 398         /* did we capture enough for fully decoding the tlv ? */
 399         ND_TCHECK2(*tptr, tlv_len);
 400
 401         tlv_tptr=tptr+sizeof(struct tlv_header_t);
 402         tlv_tlen=tlv_len-sizeof(struct tlv_header_t);
 403
 404         switch((proto_subtype << 8) + tlv_header->type) {
 405
 406             /* those two TLVs have the same structure -> fall through */
 407         case ((SLOW_PROTO_LACP << 8) + LACP_TLV_ACTOR_INFO):
 408         case ((SLOW_PROTO_LACP << 8) + LACP_TLV_PARTNER_INFO):
 409             if (tlv_tlen !=
 410                 sizeof(struct lacp_tlv_actor_partner_info_t)) {
 411                 ND_PRINT((ndo, "\n\t    ERROR: illegal length - should be %lu",
 412                        (unsigned long) (sizeof(struct tlv_header_t) + sizeof(struct lacp_tlv_actor_partner_info_t))));
 413                 goto badlength;
 414             }
 415
 416             tlv_ptr.lacp_tlv_actor_partner_info = (const struct lacp_tlv_actor_partner_info_t *)tlv_tptr;
 417
 418             ND_PRINT((ndo, "\n\t  System %s, System Priority %u, Key %u" \
 419                    ", Port %u, Port Priority %u\n\t  State Flags [%s]",
 420                    etheraddr_string(ndo, tlv_ptr.lacp_tlv_actor_partner_info->sys),
 421                    EXTRACT_16BITS(tlv_ptr.lacp_tlv_actor_partner_info->sys_pri),
 422                    EXTRACT_16BITS(tlv_ptr.lacp_tlv_actor_partner_info->key),
 423                    EXTRACT_16BITS(tlv_ptr.lacp_tlv_actor_partner_info->port),
 424                    EXTRACT_16BITS(tlv_ptr.lacp_tlv_actor_partner_info->port_pri),
 425                    bittok2str(lacp_tlv_actor_partner_info_state_values,
 426                               "none",
 427                               tlv_ptr.lacp_tlv_actor_partner_info->state)));
 428
 429             break;
 430
 431         case ((SLOW_PROTO_LACP << 8) + LACP_TLV_COLLECTOR_INFO):
 432             if (tlv_tlen !=
 433                 sizeof(struct lacp_tlv_collector_info_t)) {
 434                 ND_PRINT((ndo, "\n\t    ERROR: illegal length - should be %lu",
 435                        (unsigned long) (sizeof(struct tlv_header_t) + sizeof(struct lacp_tlv_collector_info_t))));
 436                 goto badlength;
 437             }
 438
 439             tlv_ptr.lacp_tlv_collector_info = (const struct lacp_tlv_collector_info_t *)tlv_tptr;
 440
 441             ND_PRINT((ndo, "\n\t  Max Delay %u",
 442                    EXTRACT_16BITS(tlv_ptr.lacp_tlv_collector_info->max_delay)));
 443
 444             break;
 445
 446         case ((SLOW_PROTO_MARKER << 8) + MARKER_TLV_MARKER_INFO):
 447             if (tlv_tlen !=
 448                 sizeof(struct marker_tlv_marker_info_t)) {
 449                 ND_PRINT((ndo, "\n\t    ERROR: illegal length - should be %lu",
 450                        (unsigned long) (sizeof(struct tlv_header_t) + sizeof(struct marker_tlv_marker_info_t))));
 451                 goto badlength;
 452             }
 453
 454             tlv_ptr.marker_tlv_marker_info = (const struct marker_tlv_marker_info_t *)tlv_tptr;
 455
 456             ND_PRINT((ndo, "\n\t  Request System %s, Request Port %u, Request Transaction ID 0x%08x",
 457                    etheraddr_string(ndo, tlv_ptr.marker_tlv_marker_info->req_sys),
 458                    EXTRACT_16BITS(tlv_ptr.marker_tlv_marker_info->req_port),
 459                    EXTRACT_32BITS(tlv_ptr.marker_tlv_marker_info->req_trans_id)));
 460
 461             break;
 462
 463         default:
 464             if (ndo->ndo_vflag <= 1)
 465                 print_unknown_data(ndo, tlv_tptr, "\n\t  ", tlv_tlen);
 466             break;
 467         }
 468
 469     badlength:
 470         /* do we want to see an additional hexdump ? */
 471         if (ndo->ndo_vflag > 1) {
 472             print_unknown_data(ndo, tptr+sizeof(struct tlv_header_t), "\n\t  ",
 473                                tlv_len-sizeof(struct tlv_header_t));
 474         }
 475
 476         tptr+=tlv_len;
 477         tlen-=tlv_len;
 478     }
 479     return;
 480
 481 tooshort:
 482     ND_PRINT((ndo, "\n\t\t packet is too short"));
 483     return;
 484
 485 trunc:
 486     ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
 487 }
 488
 489 static void
 490 slow_oam_print(netdissect_options *ndo,
 491                register const u_char *tptr, register u_int tlen)
 492 {
 493     u_int hexdump;
 494
 495     struct slow_oam_common_header_t {
 496         uint8_t flags[2];
 497         uint8_t code;
 498     };
 499
 500     struct slow_oam_tlv_header_t {
 501         uint8_t type;
 502         uint8_t length;
 503     };
 504
 505     union {
 506         const struct slow_oam_common_header_t *slow_oam_common_header;
 507         const struct slow_oam_tlv_header_t *slow_oam_tlv_header;
 508     } ptr;
 509
 510     union {
 511         const struct slow_oam_info_t *slow_oam_info;
 512         const struct slow_oam_link_event_t *slow_oam_link_event;
 513         const struct slow_oam_variablerequest_t *slow_oam_variablerequest;
 514         const struct slow_oam_variableresponse_t *slow_oam_variableresponse;
 515         const struct slow_oam_loopbackctrl_t *slow_oam_loopbackctrl;
 516     } tlv;
 517
 518     ptr.slow_oam_common_header = (const struct slow_oam_common_header_t *)tptr;
 519     if (tlen < sizeof(*ptr.slow_oam_common_header))
 520         goto tooshort;
 521     ND_TCHECK(*ptr.slow_oam_common_header);
 522     tptr += sizeof(struct slow_oam_common_header_t);
 523     tlen -= sizeof(struct slow_oam_common_header_t);
 524
 525     ND_PRINT((ndo, "\n\tCode %s OAM PDU, Flags [%s]",
 526            tok2str(slow_oam_code_values, "Unknown (%u)", ptr.slow_oam_common_header->code),
 527            bittok2str(slow_oam_flag_values,
 528                       "none",
 529                       EXTRACT_16BITS(&ptr.slow_oam_common_header->flags))));
 530
 531     switch (ptr.slow_oam_common_header->code) {
 532     case SLOW_OAM_CODE_INFO:
 533         while (tlen > 0) {
 534             ptr.slow_oam_tlv_header = (const struct slow_oam_tlv_header_t *)tptr;
 535             if (tlen < sizeof(*ptr.slow_oam_tlv_header))
 536                 goto tooshort;
 537             ND_TCHECK(*ptr.slow_oam_tlv_header);
 538             ND_PRINT((ndo, "\n\t  %s Information Type (%u), length %u",
 539                    tok2str(slow_oam_info_type_values, "Reserved",
 540                            ptr.slow_oam_tlv_header->type),
 541                    ptr.slow_oam_tlv_header->type,
 542                    ptr.slow_oam_tlv_header->length));
 543
 544             if (ptr.slow_oam_tlv_header->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 (ptr.slow_oam_tlv_header->length < sizeof(struct slow_oam_tlv_header_t)) {
 554                 ND_PRINT((ndo, "\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 < ptr.slow_oam_tlv_header->length)
 560                 goto tooshort;
 561             ND_TCHECK2(*tptr, ptr.slow_oam_tlv_header->length);
 562
 563             hexdump = FALSE;
 564             switch (ptr.slow_oam_tlv_header->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 (tlv.slow_oam_info->info_length !=
 570                     sizeof(struct slow_oam_info_t)) {
 571                     ND_PRINT((ndo, "\n\t    ERROR: illegal length - should be %lu",
 572                            (unsigned long) sizeof(struct slow_oam_info_t)));
 573                     hexdump = TRUE;
 574                     goto badlength_code_info;
 575                 }
 576
 577                 ND_PRINT((ndo, "\n\t    OAM-Version %u, Revision %u",
 578                        tlv.slow_oam_info->oam_version,
 579                        EXTRACT_16BITS(&tlv.slow_oam_info->revision)));
 580
 581                 ND_PRINT((ndo, "\n\t    State-Parser-Action %s, State-MUX-Action %s",
 582                        tok2str(slow_oam_info_type_state_parser_values, "Reserved",
 583                                tlv.slow_oam_info->state & OAM_INFO_TYPE_PARSER_MASK),
 584                        tok2str(slow_oam_info_type_state_mux_values, "Reserved",
 585                                tlv.slow_oam_info->state & OAM_INFO_TYPE_MUX_MASK)));
 586                 ND_PRINT((ndo, "\n\t    OAM-Config Flags [%s], OAM-PDU-Config max-PDU size %u",
 587                        bittok2str(slow_oam_info_type_oam_config_values, "none",
 588                                   tlv.slow_oam_info->oam_config),
 589                        EXTRACT_16BITS(&tlv.slow_oam_info->oam_pdu_config) &
 590                        OAM_INFO_TYPE_PDU_SIZE_MASK));
 591                 ND_PRINT((ndo, "\n\t    OUI %s (0x%06x), Vendor-Private 0x%08x",
 592                        tok2str(oui_values, "Unknown",
 593                                EXTRACT_24BITS(&tlv.slow_oam_info->oui)),
 594                        EXTRACT_24BITS(&tlv.slow_oam_info->oui),
 595                        EXTRACT_32BITS(&tlv.slow_oam_info->vendor_private)));
 596                 break;
 597
 598             case SLOW_OAM_INFO_TYPE_ORG_SPECIFIC:
 599                 hexdump = TRUE;
 600                 break;
 601
 602             default:
 603                 hexdump = TRUE;
 604                 break;
 605             }
 606
 607         badlength_code_info:
 608             /* do we also want to see a hex dump ? */
 609             if (ndo->ndo_vflag > 1 || hexdump==TRUE) {
 610                 print_unknown_data(ndo, tptr, "\n\t  ",
 611                                    ptr.slow_oam_tlv_header->length);
 612             }
 613
 614             tlen -= ptr.slow_oam_tlv_header->length;
 615             tptr += ptr.slow_oam_tlv_header->length;
 616         }
 617         break;
 618
 619     case SLOW_OAM_CODE_EVENT_NOTIF:
 620         /* Sequence number */
 621         if (tlen < 2)
 622             goto tooshort;
 623         ND_TCHECK2(*tptr, 2);
 624         ND_PRINT((ndo, "\n\t  Sequence Number %u", EXTRACT_16BITS(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(*ptr.slow_oam_tlv_header);
 634             ND_PRINT((ndo, "\n\t  %s Link Event Type (%u), length %u",
 635                    tok2str(slow_oam_link_event_values, "Reserved",
 636                            ptr.slow_oam_tlv_header->type),
 637                    ptr.slow_oam_tlv_header->type,
 638                    ptr.slow_oam_tlv_header->length));
 639
 640             if (ptr.slow_oam_tlv_header->type == SLOW_OAM_INFO_TYPE_END_OF_TLV) {
 641                 /*
 642                  * As IEEE Std 802.3-2015 says for the End of TLV Marker,
 643                  * "(the length and value of the Type 0x00 TLV can be ignored)".
 644                  */
 645                 return;
 646             }
 647
 648             /* length includes the type and length fields */
 649             if (ptr.slow_oam_tlv_header->length < sizeof(struct slow_oam_tlv_header_t)) {
 650                 ND_PRINT((ndo, "\n\t    ERROR: illegal length - should be >= %u",
 651                        (u_int)sizeof(struct slow_oam_tlv_header_t)));
 652                 return;
 653             }
 654
 655             if (tlen < ptr.slow_oam_tlv_header->length)
 656                 goto tooshort;
 657             ND_TCHECK2(*tptr, ptr.slow_oam_tlv_header->length);
 658
 659             hexdump = FALSE;
 660             switch (ptr.slow_oam_tlv_header->type) {
 661             case SLOW_OAM_LINK_EVENT_ERR_SYM_PER: /* identical format - fall through */
 662             case SLOW_OAM_LINK_EVENT_ERR_FRM:
 663             case SLOW_OAM_LINK_EVENT_ERR_FRM_PER:
 664             case SLOW_OAM_LINK_EVENT_ERR_FRM_SUMM:
 665                 tlv.slow_oam_link_event = (const struct slow_oam_link_event_t *)tptr;
 666
 667                 if (tlv.slow_oam_link_event->event_length !=
 668                     sizeof(struct slow_oam_link_event_t)) {
 669                     ND_PRINT((ndo, "\n\t    ERROR: illegal length - should be %lu",
 670                            (unsigned long) sizeof(struct slow_oam_link_event_t)));
 671                     hexdump = TRUE;
 672                     goto badlength_event_notif;
 673                 }
 674
 675                 ND_PRINT((ndo, "\n\t    Timestamp %u ms, Errored Window %" PRIu64
 676                        "\n\t    Errored Threshold %" PRIu64
 677                        "\n\t    Errors %" PRIu64
 678                        "\n\t    Error Running Total %" PRIu64
 679                        "\n\t    Event Running Total %u",
 680                        EXTRACT_16BITS(&tlv.slow_oam_link_event->time_stamp)*100,
 681                        EXTRACT_64BITS(&tlv.slow_oam_link_event->window),
 682                        EXTRACT_64BITS(&tlv.slow_oam_link_event->threshold),
 683                        EXTRACT_64BITS(&tlv.slow_oam_link_event->errors),
 684                        EXTRACT_64BITS(&tlv.slow_oam_link_event->errors_running_total),
 685                        EXTRACT_32BITS(&tlv.slow_oam_link_event->event_running_total)));
 686                 break;
 687
 688             case SLOW_OAM_LINK_EVENT_ORG_SPECIFIC:
 689                 hexdump = TRUE;
 690                 break;
 691
 692             default:
 693                 hexdump = TRUE;
 694                 break;
 695             }
 696
 697         badlength_event_notif:
 698             /* do we also want to see a hex dump ? */
 699             if (ndo->ndo_vflag > 1 || hexdump==TRUE) {
 700                 print_unknown_data(ndo, tptr, "\n\t  ",
 701                                    ptr.slow_oam_tlv_header->length);
 702             }
 703
 704             tlen -= ptr.slow_oam_tlv_header->length;
 705             tptr += ptr.slow_oam_tlv_header->length;
 706         }
 707         break;
 708
 709     case SLOW_OAM_CODE_LOOPBACK_CTRL:
 710         tlv.slow_oam_loopbackctrl = (const struct slow_oam_loopbackctrl_t *)tptr;
 711         if (tlen < sizeof(*tlv.slow_oam_loopbackctrl))
 712             goto tooshort;
 713         ND_TCHECK(*tlv.slow_oam_loopbackctrl);
 714         ND_PRINT((ndo, "\n\t  Command %s (%u)",
 715                tok2str(slow_oam_loopbackctrl_cmd_values,
 716                        "Unknown",
 717                        tlv.slow_oam_loopbackctrl->command),
 718                tlv.slow_oam_loopbackctrl->command));
 719         tptr ++;
 720         tlen --;
 721         break;
 722
 723         /*
 724          * FIXME those are the defined codes that lack a decoder
 725          * you are welcome to contribute code ;-)
 726          */
 727     case SLOW_OAM_CODE_VAR_REQUEST:
 728     case SLOW_OAM_CODE_VAR_RESPONSE:
 729     case SLOW_OAM_CODE_PRIVATE:
 730     default:
 731         if (ndo->ndo_vflag <= 1) {
 732             print_unknown_data(ndo, tptr, "\n\t  ", tlen);
 733         }
 734         break;
 735     }
 736     return;
 737
 738 tooshort:
 739     ND_PRINT((ndo, "\n\t\t packet is too short"));
 740     return;
 741
 742 trunc:
 743     ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
 744 }