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 } ND_UNALIGNED;
  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 } ND_UNALIGNED;
  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 } ND_UNALIGNED;
  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 } ND_UNALIGNED;
 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 } ND_UNALIGNED;
 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         dh = (const struct dccp_hdr *)bp;
 288
 289         ip = (const struct ip *)data2;
 290         if (IP_V(ip) == 6)
 291                 ip6 = (const struct ip6_hdr *)data2;
 292         else
 293                 ip6 = NULL;
 294
 295         /* make sure we have enough data to look at the X bit */
 296         cp = (const u_char *)(dh + 1);
 297         if (cp > ndo->ndo_snapend) {
 298                 ND_PRINT("[Invalid packet|dccp]");
 299                 return;
 300         }
 301         if (len < sizeof(struct dccp_hdr)) {
 302                 ND_PRINT("truncated-dccp - %u bytes missing!",
 303                           len - (u_int)sizeof(struct dccp_hdr));
 304                 return;
 305         }
 306
 307         /* get the length of the generic header */
 308         fixed_hdrlen = dccp_basic_hdr_len(dh);
 309         if (len < fixed_hdrlen) {
 310                 ND_PRINT("truncated-dccp - %u bytes missing!",
 311                           len - fixed_hdrlen);
 312                 return;
 313         }
 314         ND_TCHECK_LEN(dh, fixed_hdrlen);
 315
 316         sport = EXTRACT_BE_U_2(dh->dccph_sport);
 317         dport = EXTRACT_BE_U_2(dh->dccph_dport);
 318         hlen = EXTRACT_U_1(dh->dccph_doff) * 4;
 319
 320         if (ip6) {
 321                 ND_PRINT("%s.%u > %s.%u: ",
 322                           ip6addr_string(ndo, ip6->ip6_src), sport,
 323                           ip6addr_string(ndo, ip6->ip6_dst), dport);
 324         } else {
 325                 ND_PRINT("%s.%u > %s.%u: ",
 326                           ipaddr_string(ndo, ip->ip_src), sport,
 327                           ipaddr_string(ndo, ip->ip_dst), dport);
 328         }
 329
 330         ND_PRINT("DCCP");
 331
 332         if (ndo->ndo_qflag) {
 333                 ND_PRINT(" %u", len - hlen);
 334                 if (hlen > len) {
 335                         ND_PRINT(" [bad hdr length %u - too long, > %u]",
 336                                   hlen, len);
 337                 }
 338                 return;
 339         }
 340
 341         /* other variables in generic header */
 342         if (ndo->ndo_vflag) {
 343                 ND_PRINT(" (CCVal %u, CsCov %u, ", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh));
 344         }
 345
 346         /* checksum calculation */
 347         if (ndo->ndo_vflag && ND_TTEST_LEN(bp, len)) {
 348                 uint16_t sum = 0, dccp_sum;
 349
 350                 dccp_sum = EXTRACT_BE_U_2(dh->dccph_checksum);
 351                 ND_PRINT("cksum 0x%04x ", dccp_sum);
 352                 if (IP_V(ip) == 4)
 353                         sum = dccp_cksum(ndo, ip, dh, len);
 354                 else if (IP_V(ip) == 6)
 355                         sum = dccp6_cksum(ndo, ip6, dh, len);
 356                 if (sum != 0)
 357                         ND_PRINT("(incorrect -> 0x%04x)",in_cksum_shouldbe(dccp_sum, sum));
 358                 else
 359                         ND_PRINT("(correct)");
 360         }
 361
 362         if (ndo->ndo_vflag)
 363                 ND_PRINT(")");
 364         ND_PRINT(" ");
 365
 366         dccph_type = DCCPH_TYPE(dh);
 367         switch (dccph_type) {
 368         case DCCP_PKT_REQUEST: {
 369                 const struct dccp_hdr_request *dhr =
 370                         (const struct dccp_hdr_request *)(bp + fixed_hdrlen);
 371                 fixed_hdrlen += 4;
 372                 if (len < fixed_hdrlen) {
 373                         ND_PRINT("truncated-%s - %u bytes missing!",
 374                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 375                                   len - fixed_hdrlen);
 376                         return;
 377                 }
 378                 ND_TCHECK_SIZE(dhr);
 379                 ND_PRINT("%s (service=%u) ",
 380                           tok2str(dccp_pkt_type_str, "", dccph_type),
 381                           EXTRACT_BE_U_4(dhr->dccph_req_service));
 382                 break;
 383         }
 384         case DCCP_PKT_RESPONSE: {
 385                 const struct dccp_hdr_response *dhr =
 386                         (const struct dccp_hdr_response *)(bp + fixed_hdrlen);
 387                 fixed_hdrlen += 12;
 388                 if (len < fixed_hdrlen) {
 389                         ND_PRINT("truncated-%s - %u bytes missing!",
 390                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 391                                   len - fixed_hdrlen);
 392                         return;
 393                 }
 394                 ND_TCHECK_SIZE(dhr);
 395                 ND_PRINT("%s (service=%u) ",
 396                           tok2str(dccp_pkt_type_str, "", dccph_type),
 397                           EXTRACT_BE_U_4(dhr->dccph_resp_service));
 398                 break;
 399         }
 400         case DCCP_PKT_DATA:
 401                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 402                 break;
 403         case DCCP_PKT_ACK: {
 404                 fixed_hdrlen += 8;
 405                 if (len < fixed_hdrlen) {
 406                         ND_PRINT("truncated-%s - %u bytes missing!",
 407                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 408                                   len - fixed_hdrlen);
 409                         return;
 410                 }
 411                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 412                 break;
 413         }
 414         case DCCP_PKT_DATAACK: {
 415                 fixed_hdrlen += 8;
 416                 if (len < fixed_hdrlen) {
 417                         ND_PRINT("truncated-%s - %u bytes missing!",
 418                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 419                                   len - fixed_hdrlen);
 420                         return;
 421                 }
 422                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 423                 break;
 424         }
 425         case DCCP_PKT_CLOSEREQ:
 426                 fixed_hdrlen += 8;
 427                 if (len < fixed_hdrlen) {
 428                         ND_PRINT("truncated-%s - %u bytes missing!",
 429                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 430                                   len - fixed_hdrlen);
 431                         return;
 432                 }
 433                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 434                 break;
 435         case DCCP_PKT_CLOSE:
 436                 fixed_hdrlen += 8;
 437                 if (len < fixed_hdrlen) {
 438                         ND_PRINT("truncated-%s - %u bytes missing!",
 439                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 440                                   len - fixed_hdrlen);
 441                         return;
 442                 }
 443                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 444                 break;
 445         case DCCP_PKT_RESET: {
 446                 const struct dccp_hdr_reset *dhr =
 447                         (const struct dccp_hdr_reset *)(bp + fixed_hdrlen);
 448                 fixed_hdrlen += 12;
 449                 if (len < fixed_hdrlen) {
 450                         ND_PRINT("truncated-%s - %u bytes missing!",
 451                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 452                                   len - fixed_hdrlen);
 453                         return;
 454                 }
 455                 ND_TCHECK_SIZE(dhr);
 456                 ND_PRINT("%s (code=%s) ",
 457                           tok2str(dccp_pkt_type_str, "", dccph_type),
 458                           dccp_reset_code(EXTRACT_U_1(dhr->dccph_reset_code)));
 459                 break;
 460         }
 461         case DCCP_PKT_SYNC:
 462                 fixed_hdrlen += 8;
 463                 if (len < fixed_hdrlen) {
 464                         ND_PRINT("truncated-%s - %u bytes missing!",
 465                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 466                                   len - fixed_hdrlen);
 467                         return;
 468                 }
 469                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 470                 break;
 471         case DCCP_PKT_SYNCACK:
 472                 fixed_hdrlen += 8;
 473                 if (len < fixed_hdrlen) {
 474                         ND_PRINT("truncated-%s - %u bytes missing!",
 475                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 476                                   len - fixed_hdrlen);
 477                         return;
 478                 }
 479                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
 480                 break;
 481         default:
 482                 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "unknown-type-%u", dccph_type));
 483                 break;
 484         }
 485
 486         if ((DCCPH_TYPE(dh) != DCCP_PKT_DATA) &&
 487                         (DCCPH_TYPE(dh) != DCCP_PKT_REQUEST))
 488                 dccp_print_ack_no(ndo, bp);
 489
 490         if (ndo->ndo_vflag < 2)
 491                 return;
 492
 493         ND_PRINT("seq %" PRIu64, dccp_seqno(bp));
 494
 495         /* process options */
 496         if (hlen > fixed_hdrlen){
 497                 u_int optlen;
 498                 cp = bp + fixed_hdrlen;
 499                 ND_PRINT(" <");
 500
 501                 hlen -= fixed_hdrlen;
 502                 while(1){
 503                         optlen = dccp_print_option(ndo, cp, hlen);
 504                         if (!optlen)
 505                                 break;
 506                         if (hlen <= optlen)
 507                                 break;
 508                         hlen -= optlen;
 509                         cp += optlen;
 510                         ND_PRINT(", ");
 511                 }
 512                 ND_PRINT(">");
 513         }
 514         return;
 515 trunc:
 516         ND_PRINT("%s", tstr);
 517         return;
 518 }
 519
 520 static const struct tok dccp_option_values[] = {
 521         { 0, "nop" },
 522         { 1, "mandatory" },
 523         { 2, "slowreceiver" },
 524         { 32, "change_l" },
 525         { 33, "confirm_l" },
 526         { 34, "change_r" },
 527         { 35, "confirm_r" },
 528         { 36, "initcookie" },
 529         { 37, "ndp_count" },
 530         { 38, "ack_vector0" },
 531         { 39, "ack_vector1" },
 532         { 40, "data_dropped" },
 533         { 41, "timestamp" },
 534         { 42, "timestamp_echo" },
 535         { 43, "elapsed_time" },
 536         { 44, "data_checksum" },
 537         { 0, NULL }
 538 };
 539
 540 static u_int dccp_print_option(netdissect_options *ndo, const u_char *option, u_int hlen)
 541 {
 542         uint8_t optlen, i;
 543
 544         ND_TCHECK_1(option);
 545
 546         if (EXTRACT_U_1(option) >= 32) {
 547                 ND_TCHECK_1(option + 1);
 548                 optlen = EXTRACT_U_1(option + 1);
 549                 if (optlen < 2) {
 550                         if (EXTRACT_U_1(option) >= 128)
 551                                 ND_PRINT("CCID option %u optlen too short", EXTRACT_U_1(option));
 552                         else
 553                                 ND_PRINT("%s optlen too short",
 554                                           tok2str(dccp_option_values, "Option %u", EXTRACT_U_1(option)));
 555                         return 0;
 556                 }
 557         } else
 558                 optlen = 1;
 559
 560         if (hlen < optlen) {
 561                 if (EXTRACT_U_1(option) >= 128)
 562                         ND_PRINT("CCID option %u optlen goes past header length",
 563                                   EXTRACT_U_1(option));
 564                 else
 565                         ND_PRINT("%s optlen goes past header length",
 566                                   tok2str(dccp_option_values, "Option %u", EXTRACT_U_1(option)));
 567                 return 0;
 568         }
 569         ND_TCHECK_LEN(option, optlen);
 570
 571         if (EXTRACT_U_1(option) >= 128) {
 572                 ND_PRINT("CCID option %u", EXTRACT_U_1(option));
 573                 switch (optlen) {
 574                         case 4:
 575                                 ND_PRINT(" %u", EXTRACT_BE_U_2(option + 2));
 576                                 break;
 577                         case 6:
 578                                 ND_PRINT(" %u", EXTRACT_BE_U_4(option + 2));
 579                                 break;
 580                         default:
 581                                 break;
 582                 }
 583         } else {
 584                 ND_PRINT("%s", tok2str(dccp_option_values, "Option %u", EXTRACT_U_1(option)));
 585                 switch (EXTRACT_U_1(option)) {
 586                 case 32:
 587                 case 33:
 588                 case 34:
 589                 case 35:
 590                         if (optlen < 3) {
 591                                 ND_PRINT(" optlen too short");
 592                                 return optlen;
 593                         }
 594                         if (EXTRACT_U_1(option + 2) < 10){
 595                                 ND_PRINT(" %s", dccp_feature_nums[EXTRACT_U_1(option + 2)]);
 596                                 for (i = 0; i < optlen - 3; i++)
 597                                         ND_PRINT(" %u", EXTRACT_U_1(option + 3 + i));
 598                         }
 599                         break;
 600                 case 36:
 601                         if (optlen > 2) {
 602                                 ND_PRINT(" 0x");
 603                                 for (i = 0; i < optlen - 2; i++)
 604                                         ND_PRINT("%02x", EXTRACT_U_1(option + 2 + i));
 605                         }
 606                         break;
 607                 case 37:
 608                         for (i = 0; i < optlen - 2; i++)
 609                                 ND_PRINT(" %u", EXTRACT_U_1(option + 2 + i));
 610                         break;
 611                 case 38:
 612                         if (optlen > 2) {
 613                                 ND_PRINT(" 0x");
 614                                 for (i = 0; i < optlen - 2; i++)
 615                                         ND_PRINT("%02x", EXTRACT_U_1(option + 2 + i));
 616                         }
 617                         break;
 618                 case 39:
 619                         if (optlen > 2) {
 620                                 ND_PRINT(" 0x");
 621                                 for (i = 0; i < optlen - 2; i++)
 622                                         ND_PRINT("%02x", EXTRACT_U_1(option + 2 + i));
 623                         }
 624                         break;
 625                 case 40:
 626                         if (optlen > 2) {
 627                                 ND_PRINT(" 0x");
 628                                 for (i = 0; i < optlen - 2; i++)
 629                                         ND_PRINT("%02x", EXTRACT_U_1(option + 2 + i));
 630                         }
 631                         break;
 632                 case 41:
 633                         if (optlen == 4)
 634                                 ND_PRINT(" %u", EXTRACT_BE_U_4(option + 2));
 635                         else
 636                                 ND_PRINT(" optlen != 4");
 637                         break;
 638                 case 42:
 639                         if (optlen == 4)
 640                                 ND_PRINT(" %u", EXTRACT_BE_U_4(option + 2));
 641                         else
 642                                 ND_PRINT(" optlen != 4");
 643                         break;
 644                 case 43:
 645                         if (optlen == 6)
 646                                 ND_PRINT(" %u", EXTRACT_BE_U_4(option + 2));
 647                         else if (optlen == 4)
 648                                 ND_PRINT(" %u", EXTRACT_BE_U_2(option + 2));
 649                         else
 650                                 ND_PRINT(" optlen != 4 or 6");
 651                         break;
 652                 case 44:
 653                         if (optlen > 2) {
 654                                 ND_PRINT(" ");
 655                                 for (i = 0; i < optlen - 2; i++)
 656                                         ND_PRINT("%02x", EXTRACT_U_1(option + 2 + i));
 657                         }
 658                         break;
 659                 }
 660         }
 661
 662         return optlen;
 663 trunc:
 664         ND_PRINT("%s", tstr);
 665         return 0;
 666 }