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 #ifdef HAVE_CONFIG_H
  13 #include "config.h"
  14 #endif
  15
  16 #include <netdissect-stdinc.h>
  17
  18 #include <stdio.h>
  19 #include <string.h>
  20
  21 #include "netdissect.h"
  22 #include "addrtoname.h"
  23 #include "extract.h"
  24 #include "ip.h"
  25 #include "ip6.h"
  26 #include "ipproto.h"
  27
  28 /* RFC4340: Datagram Congestion Control Protocol (DCCP) */
  29
  30 /**
  31  * struct dccp_hdr - generic part of DCCP packet header, with a 24-bit
  32  * sequence number
  33  *
  34  * @dccph_sport - Relevant port on the endpoint that sent this packet
  35  * @dccph_dport - Relevant port on the other endpoint
  36  * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
  37  * @dccph_ccval - Used by the HC-Sender CCID
  38  * @dccph_cscov - Parts of the packet that are covered by the Checksum field
  39  * @dccph_checksum - Internet checksum, depends on dccph_cscov
  40  * @dccph_x - 0 = 24 bit sequence number, 1 = 48
  41  * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
  42  * @dccph_seq - 24-bit sequence number
  43  */
  44 struct dccp_hdr {
  45         uint16_t        dccph_sport,
  46                         dccph_dport;
  47         uint8_t         dccph_doff;
  48         uint8_t         dccph_ccval_cscov;
  49         uint16_t        dccph_checksum;
  50         uint8_t         dccph_xtr;
  51         uint8_t         dccph_seq[3];
  52 } UNALIGNED;
  53
  54 /**
  55  * struct dccp_hdr_ext - generic part of DCCP packet header, with a 48-bit
  56  * sequence number
  57  *
  58  * @dccph_sport - Relevant port on the endpoint that sent this packet
  59  * @dccph_dport - Relevant port on the other endpoint
  60  * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
  61  * @dccph_ccval - Used by the HC-Sender CCID
  62  * @dccph_cscov - Parts of the packet that are covered by the Checksum field
  63  * @dccph_checksum - Internet checksum, depends on dccph_cscov
  64  * @dccph_x - 0 = 24 bit sequence number, 1 = 48
  65  * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
  66  * @dccph_seq - 48-bit sequence number
  67  */
  68 struct dccp_hdr_ext {
  69         uint16_t        dccph_sport,
  70                         dccph_dport;
  71         uint8_t         dccph_doff;
  72         uint8_t         dccph_ccval_cscov;
  73         uint16_t        dccph_checksum;
  74         uint8_t         dccph_xtr;
  75         uint8_t         reserved;
  76         uint8_t         dccph_seq[6];
  77 } UNALIGNED;
  78
  79 #define DCCPH_CCVAL(dh) (((dh)->dccph_ccval_cscov >> 4) & 0xF)
  80 #define DCCPH_CSCOV(dh) (((dh)->dccph_ccval_cscov) & 0xF)
  81
  82 #define DCCPH_X(dh)     ((dh)->dccph_xtr & 1)
  83 #define DCCPH_TYPE(dh)  (((dh)->dccph_xtr >> 1) & 0xF)
  84
  85 /**
  86  * struct dccp_hdr_request - Conection initiation request header
  87  *
  88  * @dccph_req_service - Service to which the client app wants to connect
  89  */
  90 struct dccp_hdr_request {
  91         uint32_t        dccph_req_service;
  92 } UNALIGNED;
  93
  94 /**
  95  * struct dccp_hdr_response - Conection initiation response header
  96  *
  97  * @dccph_resp_ack - 48 bit ack number, contains GSR
  98  * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
  99  */
 100 struct dccp_hdr_response {
 101         uint8_t                         dccph_resp_ack[8];      /* always 8 bytes */
 102         uint32_t                        dccph_resp_service;
 103 } UNALIGNED;
 104
 105 /**
 106  * struct dccp_hdr_reset - Unconditionally shut down a connection
 107  *
 108  * @dccph_resp_ack - 48 bit ack number
 109  * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
 110  */
 111 struct dccp_hdr_reset {
 112         uint8_t                         dccph_reset_ack[8];     /* always 8 bytes */
 113         uint8_t                         dccph_reset_code,
 114                                         dccph_reset_data[3];
 115 } UNALIGNED;
 116
 117 enum dccp_pkt_type {
 118         DCCP_PKT_REQUEST = 0,
 119         DCCP_PKT_RESPONSE,
 120         DCCP_PKT_DATA,
 121         DCCP_PKT_ACK,
 122         DCCP_PKT_DATAACK,
 123         DCCP_PKT_CLOSEREQ,
 124         DCCP_PKT_CLOSE,
 125         DCCP_PKT_RESET,
 126         DCCP_PKT_SYNC,
 127         DCCP_PKT_SYNCACK
 128 };
 129
 130 static const struct tok dccp_pkt_type_str[] = {
 131         { DCCP_PKT_REQUEST, "DCCP-Request" },
 132         { DCCP_PKT_RESPONSE, "DCCP-Response" },
 133         { DCCP_PKT_DATA, "DCCP-Data" },
 134         { DCCP_PKT_ACK, "DCCP-Ack" },
 135         { DCCP_PKT_DATAACK, "DCCP-DataAck" },
 136         { DCCP_PKT_CLOSEREQ, "DCCP-CloseReq" },
 137         { DCCP_PKT_CLOSE, "DCCP-Close" },
 138         { DCCP_PKT_RESET, "DCCP-Reset" },
 139         { DCCP_PKT_SYNC, "DCCP-Sync" },
 140         { DCCP_PKT_SYNCACK, "DCCP-SyncAck" },
 141         { 0, NULL}
 142 };
 143
 144 enum dccp_reset_codes {
 145         DCCP_RESET_CODE_UNSPECIFIED = 0,
 146         DCCP_RESET_CODE_CLOSED,
 147         DCCP_RESET_CODE_ABORTED,
 148         DCCP_RESET_CODE_NO_CONNECTION,
 149         DCCP_RESET_CODE_PACKET_ERROR,
 150         DCCP_RESET_CODE_OPTION_ERROR,
 151         DCCP_RESET_CODE_MANDATORY_ERROR,
 152         DCCP_RESET_CODE_CONNECTION_REFUSED,
 153         DCCP_RESET_CODE_BAD_SERVICE_CODE,
 154         DCCP_RESET_CODE_TOO_BUSY,
 155         DCCP_RESET_CODE_BAD_INIT_COOKIE,
 156         DCCP_RESET_CODE_AGGRESSION_PENALTY,
 157         __DCCP_RESET_CODE_LAST
 158 };
 159
 160 static const char tstr[] = "[|dccp]";
 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 inline u_int dccp_csum_coverage(const struct dccp_hdr* dh, u_int len)
 191 {
 192         u_int cov;
 193
 194         if (DCCPH_CSCOV(dh) == 0)
 195                 return len;
 196         cov = (dh->dccph_doff + DCCPH_CSCOV(dh) - 1) * sizeof(uint32_t);
 197         return (cov > len)? len : cov;
 198 }
 199
 200 static int dccp_cksum(netdissect_options *ndo, const struct ip *ip,
 201         const struct dccp_hdr *dh, u_int len)
 202 {
 203         return nextproto4_cksum(ndo, ip, (const uint8_t *)(const void *)dh, len,
 204                                 dccp_csum_coverage(dh, len), IPPROTO_DCCP);
 205 }
 206
 207 static int dccp6_cksum(netdissect_options *ndo, const struct ip6_hdr *ip6,
 208         const struct dccp_hdr *dh, u_int len)
 209 {
 210         return nextproto6_cksum(ndo, ip6, (const uint8_t *)(const void *)dh, len,
 211                                 dccp_csum_coverage(dh, len), IPPROTO_DCCP);
 212 }
 213
 214 static const char *dccp_reset_code(uint8_t code)
 215 {
 216         if (code >= __DCCP_RESET_CODE_LAST)
 217                 return "invalid";
 218         return dccp_reset_codes[code];
 219 }
 220
 221 static uint64_t dccp_seqno(const u_char *bp)
 222 {
 223         const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
 224         uint64_t seqno;
 225
 226         if (DCCPH_X(dh) != 0) {
 227                 const struct dccp_hdr_ext *dhx = (const struct dccp_hdr_ext *)bp;
 228                 seqno = EXTRACT_48BITS(dhx->dccph_seq);
 229         } else {
 230                 seqno = EXTRACT_24BITS(dh->dccph_seq);
 231         }
 232
 233         return seqno;
 234 }
 235
 236 static inline unsigned int dccp_basic_hdr_len(const struct dccp_hdr *dh)
 237 {
 238         return DCCPH_X(dh) ? sizeof(struct dccp_hdr_ext) : sizeof(struct dccp_hdr);
 239 }
 240
 241 static void dccp_print_ack_no(netdissect_options *ndo, const u_char *bp)
 242 {
 243         const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
 244         const u_char *ackp = bp + dccp_basic_hdr_len(dh);
 245         uint64_t ackno;
 246
 247         if (DCCPH_X(dh) != 0) {
 248                 ND_TCHECK2(*ackp, 8);
 249                 ackno = EXTRACT_48BITS(ackp + 2);
 250         } else {
 251                 ND_TCHECK2(*ackp, 4);
 252                 ackno = EXTRACT_24BITS(ackp + 1);
 253         }
 254
 255         ND_PRINT((ndo, "(ack=%" PRIu64 ") ", ackno));
 256 trunc:
 257         return;
 258 }
 259
 260 static 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 - lenght of ip packet
 267  */
 268 void dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
 269                 u_int len)
 270 {
 271         const struct dccp_hdr *dh;
 272         const struct ip *ip;
 273         const struct ip6_hdr *ip6;
 274         const u_char *cp;
 275         u_short sport, dport;
 276         u_int hlen;
 277         u_int fixed_hdrlen;
 278         uint8_t dccph_type;
 279
 280         dh = (const struct dccp_hdr *)bp;
 281
 282         ip = (const struct ip *)data2;
 283         if (IP_V(ip) == 6)
 284                 ip6 = (const struct ip6_hdr *)data2;
 285         else
 286                 ip6 = NULL;
 287
 288         /* make sure we have enough data to look at the X bit */
 289         cp = (const u_char *)(dh + 1);
 290         if (cp > ndo->ndo_snapend) {
 291                 ND_PRINT((ndo, "[Invalid packet|dccp]"));
 292                 return;
 293         }
 294         if (len < sizeof(struct dccp_hdr)) {
 295                 ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
 296                           len - (u_int)sizeof(struct dccp_hdr)));
 297                 return;
 298         }
 299
 300         /* get the length of the generic header */
 301         fixed_hdrlen = dccp_basic_hdr_len(dh);
 302         if (len < fixed_hdrlen) {
 303                 ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
 304                           len - fixed_hdrlen));
 305                 return;
 306         }
 307         ND_TCHECK2(*dh, fixed_hdrlen);
 308
 309         sport = EXTRACT_16BITS(&dh->dccph_sport);
 310         dport = EXTRACT_16BITS(&dh->dccph_dport);
 311         hlen = dh->dccph_doff * 4;
 312
 313         if (ip6) {
 314                 ND_PRINT((ndo, "%s.%d > %s.%d: ",
 315                           ip6addr_string(ndo, &ip6->ip6_src), sport,
 316                           ip6addr_string(ndo, &ip6->ip6_dst), dport));
 317         } else {
 318                 ND_PRINT((ndo, "%s.%d > %s.%d: ",
 319                           ipaddr_string(ndo, &ip->ip_src), sport,
 320                           ipaddr_string(ndo, &ip->ip_dst), dport));
 321         }
 322
 323         ND_PRINT((ndo, "DCCP"));
 324
 325         if (ndo->ndo_qflag) {
 326                 ND_PRINT((ndo, " %d", len - hlen));
 327                 if (hlen > len) {
 328                         ND_PRINT((ndo, " [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((ndo, " (CCVal %d, CsCov %d, ", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh)));
 337         }
 338
 339         /* checksum calculation */
 340         if (ndo->ndo_vflag && ND_TTEST2(bp[0], len)) {
 341                 uint16_t sum = 0, dccp_sum;
 342
 343                 dccp_sum = EXTRACT_16BITS(&dh->dccph_checksum);
 344                 ND_PRINT((ndo, "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((ndo, "(incorrect -> 0x%04x)",in_cksum_shouldbe(dccp_sum, sum)));
 351                 else
 352                         ND_PRINT((ndo, "(correct)"));
 353         }
 354
 355         if (ndo->ndo_vflag)
 356                 ND_PRINT((ndo, ")"));
 357         ND_PRINT((ndo, " "));
 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((ndo, "truncated-%s - %u bytes missing!",
 367                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 368                                   len - fixed_hdrlen));
 369                         return;
 370                 }
 371                 ND_TCHECK(*dhr);
 372                 ND_PRINT((ndo, "%s (service=%d) ",
 373                           tok2str(dccp_pkt_type_str, "", dccph_type),
 374                           EXTRACT_32BITS(&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((ndo, "truncated-%s - %u bytes missing!",
 383                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 384                                   len - fixed_hdrlen));
 385                         return;
 386                 }
 387                 ND_TCHECK(*dhr);
 388                 ND_PRINT((ndo, "%s (service=%d) ",
 389                           tok2str(dccp_pkt_type_str, "", dccph_type),
 390                           EXTRACT_32BITS(&dhr->dccph_resp_service)));
 391                 break;
 392         }
 393         case DCCP_PKT_DATA:
 394                 ND_PRINT((ndo, "%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((ndo, "truncated-%s - %u bytes missing!",
 400                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 401                                   len - fixed_hdrlen));
 402                         return;
 403                 }
 404                 ND_PRINT((ndo, "%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((ndo, "truncated-%s - %u bytes missing!",
 411                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 412                                   len - fixed_hdrlen));
 413                         return;
 414                 }
 415                 ND_PRINT((ndo, "%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((ndo, "truncated-%s - %u bytes missing!",
 422                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 423                                   len - fixed_hdrlen));
 424                         return;
 425                 }
 426                 ND_PRINT((ndo, "%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((ndo, "truncated-%s - %u bytes missing!",
 432                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 433                                   len - fixed_hdrlen));
 434                         return;
 435                 }
 436                 ND_PRINT((ndo, "%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((ndo, "truncated-%s - %u bytes missing!",
 444                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 445                                   len - fixed_hdrlen));
 446                         return;
 447                 }
 448                 ND_TCHECK(*dhr);
 449                 ND_PRINT((ndo, "%s (code=%s) ",
 450                           tok2str(dccp_pkt_type_str, "", dccph_type),
 451                           dccp_reset_code(dhr->dccph_reset_code)));
 452                 break;
 453         }
 454         case DCCP_PKT_SYNC:
 455                 fixed_hdrlen += 8;
 456                 if (len < fixed_hdrlen) {
 457                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 458                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 459                                   len - fixed_hdrlen));
 460                         return;
 461                 }
 462                 ND_PRINT((ndo, "%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((ndo, "truncated-%s - %u bytes missing!",
 468                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 469                                   len - fixed_hdrlen));
 470                         return;
 471                 }
 472                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 473                 break;
 474         default:
 475                 ND_PRINT((ndo, "%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((ndo, "seq %" PRIu64, dccp_seqno(bp)));
 487
 488         /* process options */
 489         if (hlen > fixed_hdrlen){
 490                 u_int optlen;
 491                 cp = bp + fixed_hdrlen;
 492                 ND_PRINT((ndo, " <"));
 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((ndo, ", "));
 504                 }
 505                 ND_PRINT((ndo, ">"));
 506         }
 507         return;
 508 trunc:
 509         ND_PRINT((ndo, "%s", tstr));
 510         return;
 511 }
 512
 513 static const struct tok dccp_option_values[] = {
 514         { 0, "nop" },
 515         { 1, "mandatory" },
 516         { 2, "slowreceiver" },
 517         { 32, "change_l" },
 518         { 33, "confirm_l" },
 519         { 34, "change_r" },
 520         { 35, "confirm_r" },
 521         { 36, "initcookie" },
 522         { 37, "ndp_count" },
 523         { 38, "ack_vector0" },
 524         { 39, "ack_vector1" },
 525         { 40, "data_dropped" },
 526         { 41, "timestamp" },
 527         { 42, "timestamp_echo" },
 528         { 43, "elapsed_time" },
 529         { 44, "data_checksum" },
 530         { 0, NULL }
 531 };
 532
 533 static int
 534 dccp_print_option(netdissect_options *ndo, const u_char *option, u_int hlen)
 535 {
 536         uint8_t optlen, i;
 537
 538         ND_TCHECK(*option);
 539
 540         if (*option >= 32) {
 541                 ND_TCHECK(*(option+1));
 542                 optlen = *(option +1);
 543                 if (optlen < 2) {
 544                         if (*option >= 128)
 545                                 ND_PRINT((ndo, "CCID option %u optlen too short", *option));
 546                         else
 547                                 ND_PRINT((ndo, "%s optlen too short",
 548                                           tok2str(dccp_option_values, "Option %u", *option)));
 549                         return 0;
 550                 }
 551         } else
 552                 optlen = 1;
 553
 554         if (hlen < optlen) {
 555                 if (*option >= 128)
 556                         ND_PRINT((ndo, "CCID option %u optlen goes past header length",
 557                                   *option));
 558                 else
 559                         ND_PRINT((ndo, "%s optlen goes past header length",
 560                                   tok2str(dccp_option_values, "Option %u", *option)));
 561                 return 0;
 562         }
 563         ND_TCHECK2(*option, optlen);
 564
 565         if (*option >= 128) {
 566                 ND_PRINT((ndo, "CCID option %d", *option));
 567                 switch (optlen) {
 568                         case 4:
 569                                 ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2)));
 570                                 break;
 571                         case 6:
 572                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 573                                 break;
 574                         default:
 575                                 break;
 576                 }
 577         } else {
 578                 ND_PRINT((ndo, "%s", tok2str(dccp_option_values, "Option %u", *option)));
 579                 switch (*option) {
 580                 case 32:
 581                 case 33:
 582                 case 34:
 583                 case 35:
 584                         if (optlen < 3) {
 585                                 ND_PRINT((ndo, " optlen too short"));
 586                                 return optlen;
 587                         }
 588                         if (*(option + 2) < 10){
 589                                 ND_PRINT((ndo, " %s", dccp_feature_nums[*(option + 2)]));
 590                                 for (i = 0; i < optlen - 3; i++)
 591                                         ND_PRINT((ndo, " %d", *(option + 3 + i)));
 592                         }
 593                         break;
 594                 case 36:
 595                         if (optlen > 2) {
 596                                 ND_PRINT((ndo, " 0x"));
 597                                 for (i = 0; i < optlen - 2; i++)
 598                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 599                         }
 600                         break;
 601                 case 37:
 602                         for (i = 0; i < optlen - 2; i++)
 603                                 ND_PRINT((ndo, " %d", *(option + 2 + i)));
 604                         break;
 605                 case 38:
 606                         if (optlen > 2) {
 607                                 ND_PRINT((ndo, " 0x"));
 608                                 for (i = 0; i < optlen - 2; i++)
 609                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 610                         }
 611                         break;
 612                 case 39:
 613                         if (optlen > 2) {
 614                                 ND_PRINT((ndo, " 0x"));
 615                                 for (i = 0; i < optlen - 2; i++)
 616                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 617                         }
 618                         break;
 619                 case 40:
 620                         if (optlen > 2) {
 621                                 ND_PRINT((ndo, " 0x"));
 622                                 for (i = 0; i < optlen - 2; i++)
 623                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 624                         }
 625                         break;
 626                 case 41:
 627                 /*
 628                  * 13.1.  Timestamp Option
 629                  *
 630                  *  +--------+--------+--------+--------+--------+--------+
 631                  *  |00101001|00000110|          Timestamp Value          |
 632                  *  +--------+--------+--------+--------+--------+--------+
 633                  *   Type=41  Length=6
 634                  */
 635                         if (optlen == 6)
 636                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 637                         else
 638                                 ND_PRINT((ndo, " [optlen != 6]"));
 639                         break;
 640                 case 42:
 641                 /*
 642                  * 13.3.  Timestamp Echo Option
 643                  *
 644                  *  +--------+--------+--------+--------+--------+--------+
 645                  *  |00101010|00000110|           Timestamp Echo          |
 646                  *  +--------+--------+--------+--------+--------+--------+
 647                  *   Type=42    Len=6
 648                  *
 649                  *  +--------+--------+------- ... -------+--------+--------+
 650                  *  |00101010|00001000|  Timestamp Echo   |   Elapsed Time  |
 651                  *  +--------+--------+------- ... -------+--------+--------+
 652                  *   Type=42    Len=8       (4 bytes)
 653                  *
 654                  *  +--------+--------+------- ... -------+------- ... -------+
 655                  *  |00101010|00001010|  Timestamp Echo   |    Elapsed Time   |
 656                  *  +--------+--------+------- ... -------+------- ... -------+
 657                  *   Type=42   Len=10       (4 bytes)           (4 bytes)
 658                  */
 659                         switch (optlen) {
 660                         case 6:
 661                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 662                                 break;
 663                         case 8:
 664                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 665                                 ND_PRINT((ndo, " (elapsed time %u)", EXTRACT_16BITS(option + 6)));
 666                                 break;
 667                         case 10:
 668                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 669                                 ND_PRINT((ndo, " (elapsed time %u)", EXTRACT_32BITS(option + 6)));
 670                                 break;
 671                         default:
 672                                 ND_PRINT((ndo, " [optlen != 6 or 8 or 10]"));
 673                                 break;
 674                         }
 675                         break;
 676                 case 43:
 677                         if (optlen == 6)
 678                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 679                         else if (optlen == 4)
 680                                 ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2)));
 681                         else
 682                                 ND_PRINT((ndo, " [optlen != 4 or 6]"));
 683                         break;
 684                 case 44:
 685                         if (optlen > 2) {
 686                                 ND_PRINT((ndo, " "));
 687                                 for (i = 0; i < optlen - 2; i++)
 688                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 689                         }
 690                         break;
 691                 }
 692         }
 693
 694         return optlen;
 695 trunc:
 696         ND_PRINT((ndo, "%s", tstr));
 697         return 0;
 698 }