contrib/tcpdump/print-dccp.c

   1 /*
   2  * Copyright (C) Arnaldo Carvalho de Melo 2004
   3  * Copyright (C) Ian McDonald 2005
   4  * Copyright (C) Yoshifumi Nishida 2005
   5  *
   6  * This software may be distributed either under the terms of the
   7  * BSD-style license that accompanies tcpdump or the GNU GPL version 2
   8  */
   9
  10 /* \summary: Datagram Congestion Control Protocol (DCCP) printer */
  11
  12 /* specification: RFC 4340 */
  13
  14 #ifdef HAVE_CONFIG_H
  15 #include <config.h>
  16 #endif
  17
  18 #include "netdissect-stdinc.h"
  19
  20 #include "netdissect.h"
  21 #include "addrtoname.h"
  22 #include "extract.h"
  23 #include "ip.h"
  24 #include "ip6.h"
  25 #include "ipproto.h"
  26
  27 /* RFC4340: Datagram Congestion Control Protocol (DCCP) */
  28
  29 /**
  30  * struct dccp_hdr - generic part of DCCP packet header, with a 24-bit
  31  * sequence number
  32  *
  33  * @dccph_sport - Relevant port on the endpoint that sent this packet
  34  * @dccph_dport - Relevant port on the other endpoint
  35  * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
  36  * @dccph_ccval - Used by the HC-Sender CCID
  37  * @dccph_cscov - Parts of the packet that are covered by the Checksum field
  38  * @dccph_checksum - Internet checksum, depends on dccph_cscov
  39  * @dccph_x - 0 = 24 bit sequence number, 1 = 48
  40  * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
  41  * @dccph_seq - 24-bit sequence number
  42  */
  43 struct dccp_hdr {
  44         nd_uint16_t     dccph_sport,
  45                         dccph_dport;
  46         nd_uint8_t      dccph_doff;
  47         nd_uint8_t      dccph_ccval_cscov;
  48         nd_uint16_t     dccph_checksum;
  49         nd_uint8_t      dccph_xtr;
  50         nd_uint24_t     dccph_seq;
  51 };
  52
  53 /**
  54  * struct dccp_hdr_ext - generic part of DCCP packet header, with a 48-bit
  55  * sequence number
  56  *
  57  * @dccph_sport - Relevant port on the endpoint that sent this packet
  58  * @dccph_dport - Relevant port on the other endpoint
  59  * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
  60  * @dccph_ccval - Used by the HC-Sender CCID
  61  * @dccph_cscov - Parts of the packet that are covered by the Checksum field
  62  * @dccph_checksum - Internet checksum, depends on dccph_cscov
  63  * @dccph_x - 0 = 24 bit sequence number, 1 = 48
  64  * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
  65  * @dccph_seq - 48-bit sequence number
  66  */
  67 struct dccp_hdr_ext {
  68         nd_uint16_t     dccph_sport,
  69                         dccph_dport;
  70         nd_uint8_t      dccph_doff;
  71         nd_uint8_t      dccph_ccval_cscov;
  72         nd_uint16_t     dccph_checksum;
  73         nd_uint8_t      dccph_xtr;
  74         nd_uint8_t      reserved;
  75         nd_uint48_t     dccph_seq;
  76 };
  77
  78 #define DCCPH_CCVAL(dh) ((GET_U_1((dh)->dccph_ccval_cscov) >> 4) & 0xF)
  79 #define DCCPH_CSCOV(dh) (GET_U_1((dh)->dccph_ccval_cscov) & 0xF)
  80
  81 #define DCCPH_X(dh)     (GET_U_1((dh)->dccph_xtr) & 1)
  82 #define DCCPH_TYPE(dh)  ((GET_U_1((dh)->dccph_xtr) >> 1) & 0xF)
  83
  84 /**
  85  * struct dccp_hdr_request - Connection initiation request header
  86  *
  87  * @dccph_req_service - Service to which the client app wants to connect
  88  */
  89 struct dccp_hdr_request {
  90         nd_uint32_t     dccph_req_service;
  91 };
  92
  93 /**
  94  * struct dccp_hdr_response - Connection initiation response header
  95  *
  96  * @dccph_resp_ack - 48 bit ack number, contains GSR
  97  * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
  98  */
  99 struct dccp_hdr_response {
 100         nd_uint64_t     dccph_resp_ack; /* always 8 bytes, first 2 reserved */
 101         nd_uint32_t     dccph_resp_service;
 102 };
 103
 104 /**
 105  * struct dccp_hdr_reset - Unconditionally shut down a connection
 106  *
 107  * @dccph_resp_ack - 48 bit ack number
 108  * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
 109  */
 110 struct dccp_hdr_reset {
 111         nd_uint64_t     dccph_reset_ack;        /* always 8 bytes, first 2 reserved */
 112         nd_uint8_t      dccph_reset_code;
 113         nd_uint8_t      dccph_reset_data1;
 114         nd_uint8_t      dccph_reset_data2;
 115         nd_uint8_t      dccph_reset_data3;
 116 };
 117
 118 enum dccp_pkt_type {
 119         DCCP_PKT_REQUEST = 0,
 120         DCCP_PKT_RESPONSE,
 121         DCCP_PKT_DATA,
 122         DCCP_PKT_ACK,
 123         DCCP_PKT_DATAACK,
 124         DCCP_PKT_CLOSEREQ,
 125         DCCP_PKT_CLOSE,
 126         DCCP_PKT_RESET,
 127         DCCP_PKT_SYNC,
 128         DCCP_PKT_SYNCACK
 129 };
 130
 131 static const struct tok dccp_pkt_type_str[] = {
 132         { DCCP_PKT_REQUEST, "DCCP-Request" },
 133         { DCCP_PKT_RESPONSE, "DCCP-Response" },
 134         { DCCP_PKT_DATA, "DCCP-Data" },
 135         { DCCP_PKT_ACK, "DCCP-Ack" },
 136         { DCCP_PKT_DATAACK, "DCCP-DataAck" },
 137         { DCCP_PKT_CLOSEREQ, "DCCP-CloseReq" },
 138         { DCCP_PKT_CLOSE, "DCCP-Close" },
 139         { DCCP_PKT_RESET, "DCCP-Reset" },
 140         { DCCP_PKT_SYNC, "DCCP-Sync" },
 141         { DCCP_PKT_SYNCACK, "DCCP-SyncAck" },
 142         { 0, NULL}
 143 };
 144
 145 enum dccp_reset_codes {
 146         DCCP_RESET_CODE_UNSPECIFIED = 0,
 147         DCCP_RESET_CODE_CLOSED,
 148         DCCP_RESET_CODE_ABORTED,
 149         DCCP_RESET_CODE_NO_CONNECTION,
 150         DCCP_RESET_CODE_PACKET_ERROR,
 151         DCCP_RESET_CODE_OPTION_ERROR,
 152         DCCP_RESET_CODE_MANDATORY_ERROR,
 153         DCCP_RESET_CODE_CONNECTION_REFUSED,
 154         DCCP_RESET_CODE_BAD_SERVICE_CODE,
 155         DCCP_RESET_CODE_TOO_BUSY,
 156         DCCP_RESET_CODE_BAD_INIT_COOKIE,
 157         DCCP_RESET_CODE_AGGRESSION_PENALTY,
 158         __DCCP_RESET_CODE_LAST
 159 };
 160
 161
 162 static const char *dccp_reset_codes[] = {
 163         "unspecified",
 164         "closed",
 165         "aborted",
 166         "no_connection",
 167         "packet_error",
 168         "option_error",
 169         "mandatory_error",
 170         "connection_refused",
 171         "bad_service_code",
 172         "too_busy",
 173         "bad_init_cookie",
 174         "aggression_penalty",
 175 };
 176
 177 static const char *dccp_feature_nums[] = {
 178         "reserved",
 179         "ccid",
 180         "allow_short_seqno",
 181         "sequence_window",
 182         "ecn_incapable",
 183         "ack_ratio",
 184         "send_ack_vector",
 185         "send_ndp_count",
 186         "minimum checksum coverage",
 187         "check data checksum",
 188 };
 189
 190 static u_int
 191 dccp_csum_coverage(netdissect_options *ndo,
 192                    const struct dccp_hdr *dh, u_int len)
 193 {
 194         u_int cov;
 195
 196         if (DCCPH_CSCOV(dh) == 0)
 197                 return len;
 198         cov = (GET_U_1(dh->dccph_doff) + DCCPH_CSCOV(dh) - 1) * sizeof(uint32_t);
 199         return (cov > len)? len : cov;
 200 }
 201
 202 static uint16_t dccp_cksum(netdissect_options *ndo, const struct ip *ip,
 203         const struct dccp_hdr *dh, u_int len)
 204 {
 205         return nextproto4_cksum(ndo, ip, (const uint8_t *)(const void *)dh, len,
 206                                 dccp_csum_coverage(ndo, dh, len), IPPROTO_DCCP);
 207 }
 208
 209 static uint16_t dccp6_cksum(netdissect_options *ndo, const struct ip6_hdr *ip6,
 210         const struct dccp_hdr *dh, u_int len)
 211 {
 212         return nextproto6_cksum(ndo, ip6, (const uint8_t *)(const void *)dh, len,
 213                                 dccp_csum_coverage(ndo, dh, len), IPPROTO_DCCP);
 214 }
 215
 216 static const char *dccp_reset_code(uint8_t code)
 217 {
 218         if (code >= __DCCP_RESET_CODE_LAST)
 219                 return "invalid";
 220         return dccp_reset_codes[code];
 221 }
 222
 223 static uint64_t
 224 dccp_seqno(netdissect_options *ndo, const u_char *bp)
 225 {
 226         const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
 227         uint64_t seqno;
 228
 229         if (DCCPH_X(dh) != 0) {
 230                 const struct dccp_hdr_ext *dhx = (const struct dccp_hdr_ext *)bp;
 231                 seqno = GET_BE_U_6(dhx->dccph_seq);
 232         } else {
 233                 seqno = GET_BE_U_3(dh->dccph_seq);
 234         }
 235
 236         return seqno;
 237 }
 238
 239 static unsigned int
 240 dccp_basic_hdr_len(netdissect_options *ndo, const struct dccp_hdr *dh)
 241 {
 242         return DCCPH_X(dh) ? sizeof(struct dccp_hdr_ext) : sizeof(struct dccp_hdr);
 243 }
 244
 245 static void dccp_print_ack_no(netdissect_options *ndo, const u_char *bp)
 246 {
 247         const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
 248         const u_char *ackp = bp + dccp_basic_hdr_len(ndo, dh);
 249         uint64_t ackno;
 250
 251         if (DCCPH_X(dh) != 0) {
 252                 ackno = GET_BE_U_6(ackp + 2);
 253         } else {
 254                 ackno = GET_BE_U_3(ackp + 1);
 255         }
 256
 257         ND_PRINT("(ack=%" PRIu64 ") ", ackno);
 258 }
 259
 260 static u_int dccp_print_option(netdissect_options *, const u_char *, u_int);
 261
 262 /**
 263  * dccp_print - show dccp packet
 264  * @bp - beginning of dccp packet
 265  * @data2 - beginning of enclosing
 266  * @len - length of ip packet
 267  */
 268 void
 269 dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
 270            u_int len)
 271 {
 272         const struct dccp_hdr *dh;
 273         const struct ip *ip;
 274         const struct ip6_hdr *ip6;
 275         const u_char *cp;
 276         u_short sport, dport;
 277         u_int hlen;
 278         u_int fixed_hdrlen;
 279         uint8_t dccph_type;
 280
 281         ndo->ndo_protocol = "dccp";
 282         dh = (const struct dccp_hdr *)bp;
 283
 284         ip = (const struct ip *)data2;
 285         if (IP_V(ip) == 6)
 286                 ip6 = (const struct ip6_hdr *)data2;
 287         else
 288                 ip6 = NULL;
 289
 290         /* make sure we have enough data to look at the X bit */
 291         cp = (const u_char *)(dh + 1);
 292         if (cp > ndo->ndo_snapend)
 293                 goto trunc;
 294         if (len < sizeof(struct dccp_hdr)) {
 295                 ND_PRINT("truncated-dccp - %zu bytes missing!",
 296                          sizeof(struct dccp_hdr) - len);
 297                 return;
 298         }
 299
 300         /* get the length of the generic header */
 301         fixed_hdrlen = dccp_basic_hdr_len(ndo, dh);
 302         if (len < fixed_hdrlen) {
 303                 ND_PRINT("truncated-dccp - %u bytes missing!",
 304                           fixed_hdrlen - len);
 305                 return;
 306         }
 307         ND_TCHECK_LEN(dh, fixed_hdrlen);
 308
 309         sport = GET_BE_U_2(dh->dccph_sport);
 310         dport = GET_BE_U_2(dh->dccph_dport);
 311         hlen = GET_U_1(dh->dccph_doff) * 4;
 312
 313         if (ip6) {
 314                 ND_PRINT("%s.%u > %s.%u: ",
 315                           GET_IP6ADDR_STRING(ip6->ip6_src), sport,
 316                           GET_IP6ADDR_STRING(ip6->ip6_dst), dport);
 317         } else {
 318                 ND_PRINT("%s.%u > %s.%u: ",
 319                           GET_IPADDR_STRING(ip->ip_src), sport,
 320                           GET_IPADDR_STRING(ip->ip_dst), dport);
 321         }
 322
 323         nd_print_protocol_caps(ndo);
 324
 325         if (ndo->ndo_qflag) {
 326                 ND_PRINT(" %u", len - hlen);
 327                 if (hlen > len) {
 328                         ND_PRINT(" [bad hdr length %u - too long, > %u]",
 329                                   hlen, len);
 330                 }
 331                 return;
 332         }
 333
 334         /* other variables in generic header */
 335         if (ndo->ndo_vflag) {
 336                 ND_PRINT(" (CCVal %u, CsCov %u", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh));
 337         }
 338
 339         /* checksum calculation */
 340         if (ndo->ndo_vflag && ND_TTEST_LEN(bp, len)) {
 341                 uint16_t sum = 0, dccp_sum;
 342
 343                 dccp_sum = GET_BE_U_2(dh->dccph_checksum);
 344                 ND_PRINT(", cksum 0x%04x ", dccp_sum);
 345                 if (IP_V(ip) == 4)
 346                         sum = dccp_cksum(ndo, ip, dh, len);
 347                 else if (IP_V(ip) == 6)
 348                         sum = dccp6_cksum(ndo, ip6, dh, len);
 349                 if (sum != 0)
 350                         ND_PRINT("(incorrect -> 0x%04x)",in_cksum_shouldbe(dccp_sum, sum));
 351                 else
 352                         ND_PRINT("(correct)");
 353         }
 354
 355         if (ndo->ndo_vflag)
 356                 ND_PRINT(")");
 357         ND_PRINT(" ");
 358
 359         dccph_type = DCCPH_TYPE(dh);
 360         switch (dccph_type) {
 361         case DCCP_PKT_REQUEST: {
 362                 const struct dccp_hdr_request *dhr =
 363                         (const struct dccp_hdr_request *)(bp + fixed_hdrlen);
 364                 fixed_hdrlen += 4;
 365                 if (len < fixed_hdrlen) {
 366                         ND_PRINT("truncated-%s - %u bytes missing!",
 367                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 368                                   fixed_hdrlen - len);
 369                         return;
 370                 }
 371                 ND_TCHECK_SIZE(dhr);
 372                 ND_PRINT("%s (service=%u) ",
 373                           tok2str(dccp_pkt_type_str, "", dccph_type),
 374                           GET_BE_U_4(dhr->dccph_req_service));
 375                 break;
 376         }
 377         case DCCP_PKT_RESPONSE: {
 378                 const struct dccp_hdr_response *dhr =
 379                         (const struct dccp_hdr_response *)(bp + fixed_hdrlen);
 380                 fixed_hdrlen += 12;
 381                 if (len < fixed_hdrlen) {
 382                         ND_PRINT("truncated-%s - %u bytes missing!",
 383                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 384                                   fixed_hdrlen - len);
 385                         return;
 386                 }
 387                 ND_TCHECK_SIZE(dhr);
 388                 ND_PRINT("%s (service=%u) ",
 389                           tok2str(dccp_pkt_type_str, "", dccph_type),
 390                           GET_BE_U_4(dhr->dccph_resp_service));
 391                 break;
 392         }
 393         case DCCP_PKT_DATA:
 394                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 395                 break;
 396         case DCCP_PKT_ACK: {
 397                 fixed_hdrlen += 8;
 398                 if (len < fixed_hdrlen) {
 399                         ND_PRINT("truncated-%s - %u bytes missing!",
 400                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 401                                   fixed_hdrlen - len);
 402                         return;
 403                 }
 404                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 405                 break;
 406         }
 407         case DCCP_PKT_DATAACK: {
 408                 fixed_hdrlen += 8;
 409                 if (len < fixed_hdrlen) {
 410                         ND_PRINT("truncated-%s - %u bytes missing!",
 411                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 412                                   fixed_hdrlen - len);
 413                         return;
 414                 }
 415                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 416                 break;
 417         }
 418         case DCCP_PKT_CLOSEREQ:
 419                 fixed_hdrlen += 8;
 420                 if (len < fixed_hdrlen) {
 421                         ND_PRINT("truncated-%s - %u bytes missing!",
 422                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 423                                   fixed_hdrlen - len);
 424                         return;
 425                 }
 426                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 427                 break;
 428         case DCCP_PKT_CLOSE:
 429                 fixed_hdrlen += 8;
 430                 if (len < fixed_hdrlen) {
 431                         ND_PRINT("truncated-%s - %u bytes missing!",
 432                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 433                                   fixed_hdrlen - len);
 434                         return;
 435                 }
 436                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 437                 break;
 438         case DCCP_PKT_RESET: {
 439                 const struct dccp_hdr_reset *dhr =
 440                         (const struct dccp_hdr_reset *)(bp + fixed_hdrlen);
 441                 fixed_hdrlen += 12;
 442                 if (len < fixed_hdrlen) {
 443                         ND_PRINT("truncated-%s - %u bytes missing!",
 444                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 445                                   fixed_hdrlen - len);
 446                         return;
 447                 }
 448                 ND_TCHECK_SIZE(dhr);
 449                 ND_PRINT("%s (code=%s) ",
 450                           tok2str(dccp_pkt_type_str, "", dccph_type),
 451                           dccp_reset_code(GET_U_1(dhr->dccph_reset_code)));
 452                 break;
 453         }
 454         case DCCP_PKT_SYNC:
 455                 fixed_hdrlen += 8;
 456                 if (len < fixed_hdrlen) {
 457                         ND_PRINT("truncated-%s - %u bytes missing!",
 458                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 459                                   fixed_hdrlen - len);
 460                         return;
 461                 }
 462                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 463                 break;
 464         case DCCP_PKT_SYNCACK:
 465                 fixed_hdrlen += 8;
 466                 if (len < fixed_hdrlen) {
 467                         ND_PRINT("truncated-%s - %u bytes missing!",
 468                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 469                                   fixed_hdrlen - len);
 470                         return;
 471                 }
 472                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 473                 break;
 474         default:
 475                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "unknown-type-%u", dccph_type));
 476                 break;
 477         }
 478
 479         if ((DCCPH_TYPE(dh) != DCCP_PKT_DATA) &&
 480                         (DCCPH_TYPE(dh) != DCCP_PKT_REQUEST))
 481                 dccp_print_ack_no(ndo, bp);
 482
 483         if (ndo->ndo_vflag < 2)
 484                 return;
 485
 486         ND_PRINT("seq %" PRIu64, dccp_seqno(ndo, bp));
 487
 488         /* process options */
 489         if (hlen > fixed_hdrlen){
 490                 u_int optlen;
 491                 cp = bp + fixed_hdrlen;
 492                 ND_PRINT(" <");
 493
 494                 hlen -= fixed_hdrlen;
 495                 while(1){
 496                         optlen = dccp_print_option(ndo, cp, hlen);
 497                         if (!optlen)
 498                                 break;
 499                         if (hlen <= optlen)
 500                                 break;
 501                         hlen -= optlen;
 502                         cp += optlen;
 503                         ND_PRINT(", ");
 504                 }
 505                 ND_PRINT(">");
 506         }
 507         return;
 508 trunc:
 509         nd_print_trunc(ndo);
 510 }
 511
 512 static const struct tok dccp_option_values[] = {
 513         { 0, "nop" },
 514         { 1, "mandatory" },
 515         { 2, "slowreceiver" },
 516         { 32, "change_l" },
 517         { 33, "confirm_l" },
 518         { 34, "change_r" },
 519         { 35, "confirm_r" },
 520         { 36, "initcookie" },
 521         { 37, "ndp_count" },
 522         { 38, "ack_vector0" },
 523         { 39, "ack_vector1" },
 524         { 40, "data_dropped" },
 525         { 41, "timestamp" },
 526         { 42, "timestamp_echo" },
 527         { 43, "elapsed_time" },
 528         { 44, "data_checksum" },
 529         { 0, NULL }
 530 };
 531
 532 static u_int
 533 dccp_print_option(netdissect_options *ndo, const u_char *option, u_int hlen)
 534 {
 535         uint8_t optlen, i;
 536
 537         if (GET_U_1(option) >= 32) {
 538                 optlen = GET_U_1(option + 1);
 539                 if (optlen < 2) {
 540                         if (GET_U_1(option) >= 128)
 541                                 ND_PRINT("CCID option %u optlen too short",
 542                                          GET_U_1(option));
 543                         else
 544                                 ND_PRINT("%s optlen too short",
 545                                           tok2str(dccp_option_values, "Option %u", GET_U_1(option)));
 546                         return 0;
 547                 }
 548         } else
 549                 optlen = 1;
 550
 551         if (hlen < optlen) {
 552                 if (GET_U_1(option) >= 128)
 553                         ND_PRINT("CCID option %u optlen goes past header length",
 554                                   GET_U_1(option));
 555                 else
 556                         ND_PRINT("%s optlen goes past header length",
 557                                   tok2str(dccp_option_values, "Option %u", GET_U_1(option)));
 558                 return 0;
 559         }
 560         ND_TCHECK_LEN(option, optlen);
 561
 562         if (GET_U_1(option) >= 128) {
 563                 ND_PRINT("CCID option %u", GET_U_1(option));
 564                 switch (optlen) {
 565                         case 4:
 566                                 ND_PRINT(" %u", GET_BE_U_2(option + 2));
 567                                 break;
 568                         case 6:
 569                                 ND_PRINT(" %u", GET_BE_U_4(option + 2));
 570                                 break;
 571                         default:
 572                                 break;
 573                 }
 574         } else {
 575                 ND_PRINT("%s",
 576                          tok2str(dccp_option_values, "Option %u", GET_U_1(option)));
 577                 switch (GET_U_1(option)) {
 578                 case 32:
 579                 case 33:
 580                 case 34:
 581                 case 35:
 582                         if (optlen < 3) {
 583                                 ND_PRINT(" optlen too short");
 584                                 return optlen;
 585                         }
 586                         if (GET_U_1(option + 2) < 10){
 587                                 ND_PRINT(" %s",
 588                                          dccp_feature_nums[GET_U_1(option + 2)]);
 589                                 for (i = 0; i < optlen - 3; i++)
 590                                         ND_PRINT(" %u",
 591                                                  GET_U_1(option + 3 + i));
 592                         }
 593                         break;
 594                 case 36:
 595                         if (optlen > 2) {
 596                                 ND_PRINT(" 0x");
 597                                 for (i = 0; i < optlen - 2; i++)
 598                                         ND_PRINT("%02x",
 599                                                  GET_U_1(option + 2 + i));
 600                         }
 601                         break;
 602                 case 37:
 603                         for (i = 0; i < optlen - 2; i++)
 604                                 ND_PRINT(" %u", GET_U_1(option + 2 + i));
 605                         break;
 606                 case 38:
 607                         if (optlen > 2) {
 608                                 ND_PRINT(" 0x");
 609                                 for (i = 0; i < optlen - 2; i++)
 610                                         ND_PRINT("%02x",
 611                                                  GET_U_1(option + 2 + i));
 612                         }
 613                         break;
 614                 case 39:
 615                         if (optlen > 2) {
 616                                 ND_PRINT(" 0x");
 617                                 for (i = 0; i < optlen - 2; i++)
 618                                         ND_PRINT("%02x",
 619                                                  GET_U_1(option + 2 + i));
 620                         }
 621                         break;
 622                 case 40:
 623                         if (optlen > 2) {
 624                                 ND_PRINT(" 0x");
 625                                 for (i = 0; i < optlen - 2; i++)
 626                                         ND_PRINT("%02x",
 627                                                  GET_U_1(option + 2 + i));
 628                         }
 629                         break;
 630                 case 41:
 631                 /*
 632                  * 13.1.  Timestamp Option
 633                  *
 634                  *  +--------+--------+--------+--------+--------+--------+
 635                  *  |00101001|00000110|          Timestamp Value          |
 636                  *  +--------+--------+--------+--------+--------+--------+
 637                  *   Type=41  Length=6
 638                  */
 639                         if (optlen == 6)
 640                                 ND_PRINT(" %u", GET_BE_U_4(option + 2));
 641                         else
 642                                 ND_PRINT(" [optlen != 6]");
 643                         break;
 644                 case 42:
 645                 /*
 646                  * 13.3.  Timestamp Echo Option
 647                  *
 648                  *  +--------+--------+--------+--------+--------+--------+
 649                  *  |00101010|00000110|           Timestamp Echo          |
 650                  *  +--------+--------+--------+--------+--------+--------+
 651                  *   Type=42    Len=6
 652                  *
 653                  *  +--------+--------+------- ... -------+--------+--------+
 654                  *  |00101010|00001000|  Timestamp Echo   |   Elapsed Time  |
 655                  *  +--------+--------+------- ... -------+--------+--------+
 656                  *   Type=42    Len=8       (4 bytes)
 657                  *
 658                  *  +--------+--------+------- ... -------+------- ... -------+
 659                  *  |00101010|00001010|  Timestamp Echo   |    Elapsed Time   |
 660                  *  +--------+--------+------- ... -------+------- ... -------+
 661                  *   Type=42   Len=10       (4 bytes)           (4 bytes)
 662                  */
 663                         switch (optlen) {
 664                         case 6:
 665                                 ND_PRINT(" %u", GET_BE_U_4(option + 2));
 666                                 break;
 667                         case 8:
 668                                 ND_PRINT(" %u", GET_BE_U_4(option + 2));
 669                                 ND_PRINT(" (elapsed time %u)",
 670                                          GET_BE_U_2(option + 6));
 671                                 break;
 672                         case 10:
 673                                 ND_PRINT(" %u", GET_BE_U_4(option + 2));
 674                                 ND_PRINT(" (elapsed time %u)",
 675                                          GET_BE_U_4(option + 6));
 676                                 break;
 677                         default:
 678                                 ND_PRINT(" [optlen != 6 or 8 or 10]");
 679                                 break;
 680                         }
 681                         break;
 682                 case 43:
 683                         if (optlen == 6)
 684                                 ND_PRINT(" %u", GET_BE_U_4(option + 2));
 685                         else if (optlen == 4)
 686                                 ND_PRINT(" %u", GET_BE_U_2(option + 2));
 687                         else
 688                                 ND_PRINT(" [optlen != 4 or 6]");
 689                         break;
 690                 case 44:
 691                         if (optlen > 2) {
 692                                 ND_PRINT(" ");
 693                                 for (i = 0; i < optlen - 2; i++)
 694                                         ND_PRINT("%02x",
 695                                                  GET_U_1(option + 2 + i));
 696                         }
 697                         break;
 698                 }
 699         }
 700
 701         return optlen;
 702 trunc:
 703         nd_print_trunc(ndo);
 704         return 0;
 705 }