The Tcpdump Group git mirrors - tcpdump/blob - 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 <stdio.h>
  21 #include <string.h>
  22
  23 #include "netdissect.h"
  24 #include "addrtoname.h"
  25 #include "extract.h"
  26 #include "ip.h"
  27 #include "ip6.h"
  28 #include "ipproto.h"
  29
  30 /* RFC4340: Datagram Congestion Control Protocol (DCCP) */
  31
  32 /**
  33  * struct dccp_hdr - generic part of DCCP packet header, with a 24-bit
  34  * sequence number
  35  *
  36  * @dccph_sport - Relevant port on the endpoint that sent this packet
  37  * @dccph_dport - Relevant port on the other endpoint
  38  * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
  39  * @dccph_ccval - Used by the HC-Sender CCID
  40  * @dccph_cscov - Parts of the packet that are covered by the Checksum field
  41  * @dccph_checksum - Internet checksum, depends on dccph_cscov
  42  * @dccph_x - 0 = 24 bit sequence number, 1 = 48
  43  * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
  44  * @dccph_seq - 24-bit sequence number
  45  */
  46 struct dccp_hdr {
  47         nd_uint16_t     dccph_sport,
  48                         dccph_dport;
  49         nd_uint8_t      dccph_doff;
  50         nd_uint8_t      dccph_ccval_cscov;
  51         nd_uint16_t     dccph_checksum;
  52         nd_uint8_t      dccph_xtr;
  53         nd_uint24_t     dccph_seq;
  54 };
  55
  56 /**
  57  * struct dccp_hdr_ext - generic part of DCCP packet header, with a 48-bit
  58  * sequence number
  59  *
  60  * @dccph_sport - Relevant port on the endpoint that sent this packet
  61  * @dccph_dport - Relevant port on the other endpoint
  62  * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
  63  * @dccph_ccval - Used by the HC-Sender CCID
  64  * @dccph_cscov - Parts of the packet that are covered by the Checksum field
  65  * @dccph_checksum - Internet checksum, depends on dccph_cscov
  66  * @dccph_x - 0 = 24 bit sequence number, 1 = 48
  67  * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
  68  * @dccph_seq - 48-bit sequence number
  69  */
  70 struct dccp_hdr_ext {
  71         nd_uint16_t     dccph_sport,
  72                         dccph_dport;
  73         nd_uint8_t      dccph_doff;
  74         nd_uint8_t      dccph_ccval_cscov;
  75         nd_uint16_t     dccph_checksum;
  76         nd_uint8_t      dccph_xtr;
  77         nd_uint8_t      reserved;
  78         nd_uint48_t     dccph_seq;
  79 };
  80
  81 #define DCCPH_CCVAL(dh) ((EXTRACT_U_1((dh)->dccph_ccval_cscov) >> 4) & 0xF)
  82 #define DCCPH_CSCOV(dh) (EXTRACT_U_1((dh)->dccph_ccval_cscov) & 0xF)
  83
  84 #define DCCPH_X(dh)     (EXTRACT_U_1((dh)->dccph_xtr) & 1)
  85 #define DCCPH_TYPE(dh)  ((EXTRACT_U_1((dh)->dccph_xtr) >> 1) & 0xF)
  86
  87 /**
  88  * struct dccp_hdr_request - Conection initiation request header
  89  *
  90  * @dccph_req_service - Service to which the client app wants to connect
  91  */
  92 struct dccp_hdr_request {
  93         nd_uint32_t     dccph_req_service;
  94 };
  95
  96 /**
  97  * struct dccp_hdr_response - Conection initiation response header
  98  *
  99  * @dccph_resp_ack - 48 bit ack number, contains GSR
 100  * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
 101  */
 102 struct dccp_hdr_response {
 103         nd_uint64_t     dccph_resp_ack; /* always 8 bytes, first 2 reserved */
 104         nd_uint32_t     dccph_resp_service;
 105 };
 106
 107 /**
 108  * struct dccp_hdr_reset - Unconditionally shut down a connection
 109  *
 110  * @dccph_resp_ack - 48 bit ack number
 111  * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
 112  */
 113 struct dccp_hdr_reset {
 114         nd_uint64_t     dccph_reset_ack;        /* always 8 bytes, first 2 reserved */
 115         nd_uint8_t      dccph_reset_code;
 116         nd_uint8_t      dccph_reset_data1;
 117         nd_uint8_t      dccph_reset_data2;
 118         nd_uint8_t      dccph_reset_data3;
 119 };
 120
 121 enum dccp_pkt_type {
 122         DCCP_PKT_REQUEST = 0,
 123         DCCP_PKT_RESPONSE,
 124         DCCP_PKT_DATA,
 125         DCCP_PKT_ACK,
 126         DCCP_PKT_DATAACK,
 127         DCCP_PKT_CLOSEREQ,
 128         DCCP_PKT_CLOSE,
 129         DCCP_PKT_RESET,
 130         DCCP_PKT_SYNC,
 131         DCCP_PKT_SYNCACK
 132 };
 133
 134 static const struct tok dccp_pkt_type_str[] = {
 135         { DCCP_PKT_REQUEST, "DCCP-Request" },
 136         { DCCP_PKT_RESPONSE, "DCCP-Response" },
 137         { DCCP_PKT_DATA, "DCCP-Data" },
 138         { DCCP_PKT_ACK, "DCCP-Ack" },
 139         { DCCP_PKT_DATAACK, "DCCP-DataAck" },
 140         { DCCP_PKT_CLOSEREQ, "DCCP-CloseReq" },
 141         { DCCP_PKT_CLOSE, "DCCP-Close" },
 142         { DCCP_PKT_RESET, "DCCP-Reset" },
 143         { DCCP_PKT_SYNC, "DCCP-Sync" },
 144         { DCCP_PKT_SYNCACK, "DCCP-SyncAck" },
 145         { 0, NULL}
 146 };
 147
 148 enum dccp_reset_codes {
 149         DCCP_RESET_CODE_UNSPECIFIED = 0,
 150         DCCP_RESET_CODE_CLOSED,
 151         DCCP_RESET_CODE_ABORTED,
 152         DCCP_RESET_CODE_NO_CONNECTION,
 153         DCCP_RESET_CODE_PACKET_ERROR,
 154         DCCP_RESET_CODE_OPTION_ERROR,
 155         DCCP_RESET_CODE_MANDATORY_ERROR,
 156         DCCP_RESET_CODE_CONNECTION_REFUSED,
 157         DCCP_RESET_CODE_BAD_SERVICE_CODE,
 158         DCCP_RESET_CODE_TOO_BUSY,
 159         DCCP_RESET_CODE_BAD_INIT_COOKIE,
 160         DCCP_RESET_CODE_AGGRESSION_PENALTY,
 161         __DCCP_RESET_CODE_LAST
 162 };
 163
 164 static const char tstr[] = "[|dccp]";
 165
 166 static const char *dccp_reset_codes[] = {
 167         "unspecified",
 168         "closed",
 169         "aborted",
 170         "no_connection",
 171         "packet_error",
 172         "option_error",
 173         "mandatory_error",
 174         "connection_refused",
 175         "bad_service_code",
 176         "too_busy",
 177         "bad_init_cookie",
 178         "aggression_penalty",
 179 };
 180
 181 static const char *dccp_feature_nums[] = {
 182         "reserved",
 183         "ccid",
 184         "allow_short_seqno",
 185         "sequence_window",
 186         "ecn_incapable",
 187         "ack_ratio",
 188         "send_ack_vector",
 189         "send_ndp_count",
 190         "minimum checksum coverage",
 191         "check data checksum",
 192 };
 193
 194 static u_int
 195 dccp_csum_coverage(const struct dccp_hdr* dh, u_int len)
 196 {
 197         u_int cov;
 198
 199         if (DCCPH_CSCOV(dh) == 0)
 200                 return len;
 201         cov = (EXTRACT_U_1(dh->dccph_doff) + DCCPH_CSCOV(dh) - 1) * sizeof(uint32_t);
 202         return (cov > len)? len : cov;
 203 }
 204
 205 static int dccp_cksum(netdissect_options *ndo, const struct ip *ip,
 206         const struct dccp_hdr *dh, u_int len)
 207 {
 208         return nextproto4_cksum(ndo, ip, (const uint8_t *)(const void *)dh, len,
 209                                 dccp_csum_coverage(dh, len), IPPROTO_DCCP);
 210 }
 211
 212 static int dccp6_cksum(netdissect_options *ndo, const struct ip6_hdr *ip6,
 213         const struct dccp_hdr *dh, u_int len)
 214 {
 215         return nextproto6_cksum(ndo, ip6, (const uint8_t *)(const void *)dh, len,
 216                                 dccp_csum_coverage(dh, len), IPPROTO_DCCP);
 217 }
 218
 219 static const char *dccp_reset_code(uint8_t code)
 220 {
 221         if (code >= __DCCP_RESET_CODE_LAST)
 222                 return "invalid";
 223         return dccp_reset_codes[code];
 224 }
 225
 226 static uint64_t dccp_seqno(const u_char *bp)
 227 {
 228         const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
 229         uint64_t seqno;
 230
 231         if (DCCPH_X(dh) != 0) {
 232                 const struct dccp_hdr_ext *dhx = (const struct dccp_hdr_ext *)bp;
 233                 seqno = EXTRACT_BE_U_6(dhx->dccph_seq);
 234         } else {
 235                 seqno = EXTRACT_BE_U_3(dh->dccph_seq);
 236         }
 237
 238         return seqno;
 239 }
 240
 241 static unsigned int
 242 dccp_basic_hdr_len(const struct dccp_hdr *dh)
 243 {
 244         return DCCPH_X(dh) ? sizeof(struct dccp_hdr_ext) : sizeof(struct dccp_hdr);
 245 }
 246
 247 static void dccp_print_ack_no(netdissect_options *ndo, const u_char *bp)
 248 {
 249         const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
 250         const u_char *ackp = bp + dccp_basic_hdr_len(dh);
 251         uint64_t ackno;
 252
 253         if (DCCPH_X(dh) != 0) {
 254                 ND_TCHECK_8(ackp);
 255                 ackno = EXTRACT_BE_U_6(ackp + 2);
 256         } else {
 257                 ND_TCHECK_4(ackp);
 258                 ackno = EXTRACT_BE_U_3(ackp + 1);
 259         }
 260
 261         ND_PRINT("(ack=%" PRIu64 ") ", ackno);
 262 trunc:
 263         return;
 264 }
 265
 266 static u_int dccp_print_option(netdissect_options *, const u_char *, u_int);
 267
 268 /**
 269  * dccp_print - show dccp packet
 270  * @bp - beginning of dccp packet
 271  * @data2 - beginning of enclosing
 272  * @len - lenght of ip packet
 273  */
 274 void
 275 dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
 276            u_int len)
 277 {
 278         const struct dccp_hdr *dh;
 279         const struct ip *ip;
 280         const struct ip6_hdr *ip6;
 281         const u_char *cp;
 282         u_short sport, dport;
 283         u_int hlen;
 284         u_int fixed_hdrlen;
 285         uint8_t dccph_type;
 286
 287         ndo->ndo_protocol = "dccp";
 288         dh = (const struct dccp_hdr *)bp;
 289
 290         ip = (const struct ip *)data2;
 291         if (IP_V(ip) == 6)
 292                 ip6 = (const struct ip6_hdr *)data2;
 293         else
 294                 ip6 = NULL;
 295
 296         /* make sure we have enough data to look at the X bit */
 297         cp = (const u_char *)(dh + 1);
 298         if (cp > ndo->ndo_snapend) {
 299                 ND_PRINT("[Invalid packet|dccp]");
 300                 return;
 301         }
 302         if (len < sizeof(struct dccp_hdr)) {
 303                 ND_PRINT("truncated-dccp - %u bytes missing!",
 304                           len - (u_int)sizeof(struct dccp_hdr));
 305                 return;
 306         }
 307
 308         /* get the length of the generic header */
 309         fixed_hdrlen = dccp_basic_hdr_len(dh);
 310         if (len < fixed_hdrlen) {
 311                 ND_PRINT("truncated-dccp - %u bytes missing!",
 312                           len - fixed_hdrlen);
 313                 return;
 314         }
 315         ND_TCHECK_LEN(dh, fixed_hdrlen);
 316
 317         sport = EXTRACT_BE_U_2(dh->dccph_sport);
 318         dport = EXTRACT_BE_U_2(dh->dccph_dport);
 319         hlen = EXTRACT_U_1(dh->dccph_doff) * 4;
 320
 321         if (ip6) {
 322                 ND_PRINT("%s.%u > %s.%u: ",
 323                           ip6addr_string(ndo, ip6->ip6_src), sport,
 324                           ip6addr_string(ndo, ip6->ip6_dst), dport);
 325         } else {
 326                 ND_PRINT("%s.%u > %s.%u: ",
 327                           ipaddr_string(ndo, ip->ip_src), sport,
 328                           ipaddr_string(ndo, ip->ip_dst), dport);
 329         }
 330
 331         ND_PRINT("DCCP");
 332
 333         if (ndo->ndo_qflag) {
 334                 ND_PRINT(" %u", len - hlen);
 335                 if (hlen > len) {
 336                         ND_PRINT(" [bad hdr length %u - too long, > %u]",
 337                                   hlen, len);
 338                 }
 339                 return;
 340         }
 341
 342         /* other variables in generic header */
 343         if (ndo->ndo_vflag) {
 344                 ND_PRINT(" (CCVal %u, CsCov %u, ", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh));
 345         }
 346
 347         /* checksum calculation */
 348         if (ndo->ndo_vflag && ND_TTEST_LEN(bp, len)) {
 349                 uint16_t sum = 0, dccp_sum;
 350
 351                 dccp_sum = EXTRACT_BE_U_2(dh->dccph_checksum);
 352                 ND_PRINT("cksum 0x%04x ", dccp_sum);
 353                 if (IP_V(ip) == 4)
 354                         sum = dccp_cksum(ndo, ip, dh, len);
 355                 else if (IP_V(ip) == 6)
 356                         sum = dccp6_cksum(ndo, ip6, dh, len);
 357                 if (sum != 0)
 358                         ND_PRINT("(incorrect -> 0x%04x)",in_cksum_shouldbe(dccp_sum, sum));
 359                 else
 360                         ND_PRINT("(correct)");
 361         }
 362
 363         if (ndo->ndo_vflag)
 364                 ND_PRINT(")");
 365         ND_PRINT(" ");
 366
 367         dccph_type = DCCPH_TYPE(dh);
 368         switch (dccph_type) {
 369         case DCCP_PKT_REQUEST: {
 370                 const struct dccp_hdr_request *dhr =
 371                         (const struct dccp_hdr_request *)(bp + fixed_hdrlen);
 372                 fixed_hdrlen += 4;
 373                 if (len < fixed_hdrlen) {
 374                         ND_PRINT("truncated-%s - %u bytes missing!",
 375                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 376                                   len - fixed_hdrlen);
 377                         return;
 378                 }
 379                 ND_TCHECK_SIZE(dhr);
 380                 ND_PRINT("%s (service=%u) ",
 381                           tok2str(dccp_pkt_type_str, "", dccph_type),
 382                           EXTRACT_BE_U_4(dhr->dccph_req_service));
 383                 break;
 384         }
 385         case DCCP_PKT_RESPONSE: {
 386                 const struct dccp_hdr_response *dhr =
 387                         (const struct dccp_hdr_response *)(bp + fixed_hdrlen);
 388                 fixed_hdrlen += 12;
 389                 if (len < fixed_hdrlen) {
 390                         ND_PRINT("truncated-%s - %u bytes missing!",
 391                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 392                                   len - fixed_hdrlen);
 393                         return;
 394                 }
 395                 ND_TCHECK_SIZE(dhr);
 396                 ND_PRINT("%s (service=%u) ",
 397                           tok2str(dccp_pkt_type_str, "", dccph_type),
 398                           EXTRACT_BE_U_4(dhr->dccph_resp_service));
 399                 break;
 400         }
 401         case DCCP_PKT_DATA:
 402                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 403                 break;
 404         case DCCP_PKT_ACK: {
 405                 fixed_hdrlen += 8;
 406                 if (len < fixed_hdrlen) {
 407                         ND_PRINT("truncated-%s - %u bytes missing!",
 408                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 409                                   len - fixed_hdrlen);
 410                         return;
 411                 }
 412                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 413                 break;
 414         }
 415         case DCCP_PKT_DATAACK: {
 416                 fixed_hdrlen += 8;
 417                 if (len < fixed_hdrlen) {
 418                         ND_PRINT("truncated-%s - %u bytes missing!",
 419                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 420                                   len - fixed_hdrlen);
 421                         return;
 422                 }
 423                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 424                 break;
 425         }
 426         case DCCP_PKT_CLOSEREQ:
 427                 fixed_hdrlen += 8;
 428                 if (len < fixed_hdrlen) {
 429                         ND_PRINT("truncated-%s - %u bytes missing!",
 430                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 431                                   len - fixed_hdrlen);
 432                         return;
 433                 }
 434                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 435                 break;
 436         case DCCP_PKT_CLOSE:
 437                 fixed_hdrlen += 8;
 438                 if (len < fixed_hdrlen) {
 439                         ND_PRINT("truncated-%s - %u bytes missing!",
 440                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 441                                   len - fixed_hdrlen);
 442                         return;
 443                 }
 444                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 445                 break;
 446         case DCCP_PKT_RESET: {
 447                 const struct dccp_hdr_reset *dhr =
 448                         (const struct dccp_hdr_reset *)(bp + fixed_hdrlen);
 449                 fixed_hdrlen += 12;
 450                 if (len < fixed_hdrlen) {
 451                         ND_PRINT("truncated-%s - %u bytes missing!",
 452                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 453                                   len - fixed_hdrlen);
 454                         return;
 455                 }
 456                 ND_TCHECK_SIZE(dhr);
 457                 ND_PRINT("%s (code=%s) ",
 458                           tok2str(dccp_pkt_type_str, "", dccph_type),
 459                           dccp_reset_code(EXTRACT_U_1(dhr->dccph_reset_code)));
 460                 break;
 461         }
 462         case DCCP_PKT_SYNC:
 463                 fixed_hdrlen += 8;
 464                 if (len < fixed_hdrlen) {
 465                         ND_PRINT("truncated-%s - %u bytes missing!",
 466                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 467                                   len - fixed_hdrlen);
 468                         return;
 469                 }
 470                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 471                 break;
 472         case DCCP_PKT_SYNCACK:
 473                 fixed_hdrlen += 8;
 474                 if (len < fixed_hdrlen) {
 475                         ND_PRINT("truncated-%s - %u bytes missing!",
 476                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 477                                   len - fixed_hdrlen);
 478                         return;
 479                 }
 480                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 481                 break;
 482         default:
 483                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "unknown-type-%u", dccph_type));
 484                 break;
 485         }
 486
 487         if ((DCCPH_TYPE(dh) != DCCP_PKT_DATA) &&
 488                         (DCCPH_TYPE(dh) != DCCP_PKT_REQUEST))
 489                 dccp_print_ack_no(ndo, bp);
 490
 491         if (ndo->ndo_vflag < 2)
 492                 return;
 493
 494         ND_PRINT("seq %" PRIu64, dccp_seqno(bp));
 495
 496         /* process options */
 497         if (hlen > fixed_hdrlen){
 498                 u_int optlen;
 499                 cp = bp + fixed_hdrlen;
 500                 ND_PRINT(" <");
 501
 502                 hlen -= fixed_hdrlen;
 503                 while(1){
 504                         optlen = dccp_print_option(ndo, cp, hlen);
 505                         if (!optlen)
 506                                 break;
 507                         if (hlen <= optlen)
 508                                 break;
 509                         hlen -= optlen;
 510                         cp += optlen;
 511                         ND_PRINT(", ");
 512                 }
 513                 ND_PRINT(">");
 514         }
 515         return;
 516 trunc:
 517         ND_PRINT("%s", tstr);
 518         return;
 519 }
 520
 521 static const struct tok dccp_option_values[] = {
 522         { 0, "nop" },
 523         { 1, "mandatory" },
 524         { 2, "slowreceiver" },
 525         { 32, "change_l" },
 526         { 33, "confirm_l" },
 527         { 34, "change_r" },
 528         { 35, "confirm_r" },
 529         { 36, "initcookie" },
 530         { 37, "ndp_count" },
 531         { 38, "ack_vector0" },
 532         { 39, "ack_vector1" },
 533         { 40, "data_dropped" },
 534         { 41, "timestamp" },
 535         { 42, "timestamp_echo" },
 536         { 43, "elapsed_time" },
 537         { 44, "data_checksum" },
 538         { 0, NULL }
 539 };
 540
 541 static u_int dccp_print_option(netdissect_options *ndo, const u_char *option, u_int hlen)
 542 {
 543         uint8_t optlen, i;
 544
 545         ND_TCHECK_1(option);
 546
 547         if (EXTRACT_U_1(option) >= 32) {
 548                 ND_TCHECK_1(option + 1);
 549                 optlen = EXTRACT_U_1(option + 1);
 550                 if (optlen < 2) {
 551                         if (EXTRACT_U_1(option) >= 128)
 552                                 ND_PRINT("CCID option %u optlen too short", EXTRACT_U_1(option));
 553                         else
 554                                 ND_PRINT("%s optlen too short",
 555                                           tok2str(dccp_option_values, "Option %u", EXTRACT_U_1(option)));
 556                         return 0;
 557                 }
 558         } else
 559                 optlen = 1;
 560
 561         if (hlen < optlen) {
 562                 if (EXTRACT_U_1(option) >= 128)
 563                         ND_PRINT("CCID option %u optlen goes past header length",
 564                                   EXTRACT_U_1(option));
 565                 else
 566                         ND_PRINT("%s optlen goes past header length",
 567                                   tok2str(dccp_option_values, "Option %u", EXTRACT_U_1(option)));
 568                 return 0;
 569         }
 570         ND_TCHECK_LEN(option, optlen);
 571
 572         if (EXTRACT_U_1(option) >= 128) {
 573                 ND_PRINT("CCID option %u", EXTRACT_U_1(option));
 574                 switch (optlen) {
 575                         case 4:
 576                                 ND_PRINT(" %u", EXTRACT_BE_U_2(option + 2));
 577                                 break;
 578                         case 6:
 579                                 ND_PRINT(" %u", EXTRACT_BE_U_4(option + 2));
 580                                 break;
 581                         default:
 582                                 break;
 583                 }
 584         } else {
 585                 ND_PRINT("%s", tok2str(dccp_option_values, "Option %u", EXTRACT_U_1(option)));
 586                 switch (EXTRACT_U_1(option)) {
 587                 case 32:
 588                 case 33:
 589                 case 34:
 590                 case 35:
 591                         if (optlen < 3) {
 592                                 ND_PRINT(" optlen too short");
 593                                 return optlen;
 594                         }
 595                         if (EXTRACT_U_1(option + 2) < 10){
 596                                 ND_PRINT(" %s", dccp_feature_nums[EXTRACT_U_1(option + 2)]);
 597                                 for (i = 0; i < optlen - 3; i++)
 598                                         ND_PRINT(" %u", EXTRACT_U_1(option + 3 + i));
 599                         }
 600                         break;
 601                 case 36:
 602                         if (optlen > 2) {
 603                                 ND_PRINT(" 0x");
 604                                 for (i = 0; i < optlen - 2; i++)
 605                                         ND_PRINT("%02x", EXTRACT_U_1(option + 2 + i));
 606                         }
 607                         break;
 608                 case 37:
 609                         for (i = 0; i < optlen - 2; i++)
 610                                 ND_PRINT(" %u", EXTRACT_U_1(option + 2 + i));
 611                         break;
 612                 case 38:
 613                         if (optlen > 2) {
 614                                 ND_PRINT(" 0x");
 615                                 for (i = 0; i < optlen - 2; i++)
 616                                         ND_PRINT("%02x", EXTRACT_U_1(option + 2 + i));
 617                         }
 618                         break;
 619                 case 39:
 620                         if (optlen > 2) {
 621                                 ND_PRINT(" 0x");
 622                                 for (i = 0; i < optlen - 2; i++)
 623                                         ND_PRINT("%02x", EXTRACT_U_1(option + 2 + i));
 624                         }
 625                         break;
 626                 case 40:
 627                         if (optlen > 2) {
 628                                 ND_PRINT(" 0x");
 629                                 for (i = 0; i < optlen - 2; i++)
 630                                         ND_PRINT("%02x", EXTRACT_U_1(option + 2 + i));
 631                         }
 632                         break;
 633                 case 41:
 634                         if (optlen == 4)
 635                                 ND_PRINT(" %u", EXTRACT_BE_U_4(option + 2));
 636                         else
 637                                 ND_PRINT(" optlen != 4");
 638                         break;
 639                 case 42:
 640                         if (optlen == 4)
 641                                 ND_PRINT(" %u", EXTRACT_BE_U_4(option + 2));
 642                         else
 643                                 ND_PRINT(" optlen != 4");
 644                         break;
 645                 case 43:
 646                         if (optlen == 6)
 647                                 ND_PRINT(" %u", EXTRACT_BE_U_4(option + 2));
 648                         else if (optlen == 4)
 649                                 ND_PRINT(" %u", EXTRACT_BE_U_2(option + 2));
 650                         else
 651                                 ND_PRINT(" optlen != 4 or 6");
 652                         break;
 653                 case 44:
 654                         if (optlen > 2) {
 655                                 ND_PRINT(" ");
 656                                 for (i = 0; i < optlen - 2; i++)
 657                                         ND_PRINT("%02x", EXTRACT_U_1(option + 2 + i));
 658                         }
 659                         break;
 660                 }
 661         }
 662
 663         return optlen;
 664 trunc:
 665         ND_PRINT("%s", tstr);
 666         return 0;
 667 }