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 } 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 } 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 } 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 } 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 } 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 inline u_int dccp_csum_coverage(const struct dccp_hdr* dh, u_int len)
 195 {
 196         u_int cov;
 197
 198         if (DCCPH_CSCOV(dh) == 0)
 199                 return len;
 200         cov = (EXTRACT_U_1(dh->dccph_doff) + DCCPH_CSCOV(dh) - 1) * sizeof(uint32_t);
 201         return (cov > len)? len : cov;
 202 }
 203
 204 static int dccp_cksum(netdissect_options *ndo, const struct ip *ip,
 205         const struct dccp_hdr *dh, u_int len)
 206 {
 207         return nextproto4_cksum(ndo, ip, (const uint8_t *)(const void *)dh, len,
 208                                 dccp_csum_coverage(dh, len), IPPROTO_DCCP);
 209 }
 210
 211 static int dccp6_cksum(netdissect_options *ndo, const struct ip6_hdr *ip6,
 212         const struct dccp_hdr *dh, u_int len)
 213 {
 214         return nextproto6_cksum(ndo, ip6, (const uint8_t *)(const void *)dh, len,
 215                                 dccp_csum_coverage(dh, len), IPPROTO_DCCP);
 216 }
 217
 218 static const char *dccp_reset_code(uint8_t code)
 219 {
 220         if (code >= __DCCP_RESET_CODE_LAST)
 221                 return "invalid";
 222         return dccp_reset_codes[code];
 223 }
 224
 225 static uint64_t dccp_seqno(const u_char *bp)
 226 {
 227         const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
 228         uint64_t seqno;
 229
 230         if (DCCPH_X(dh) != 0) {
 231                 const struct dccp_hdr_ext *dhx = (const struct dccp_hdr_ext *)bp;
 232                 seqno = EXTRACT_BE_U_6(dhx->dccph_seq);
 233         } else {
 234                 seqno = EXTRACT_BE_U_3(dh->dccph_seq);
 235         }
 236
 237         return seqno;
 238 }
 239
 240 static inline unsigned int dccp_basic_hdr_len(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(dh);
 249         uint64_t ackno;
 250
 251         if (DCCPH_X(dh) != 0) {
 252                 ND_TCHECK_8(ackp);
 253                 ackno = EXTRACT_BE_U_6(ackp + 2);
 254         } else {
 255                 ND_TCHECK_4(ackp);
 256                 ackno = EXTRACT_BE_U_3(ackp + 1);
 257         }
 258
 259         ND_PRINT((ndo, "(ack=%" PRIu64 ") ", ackno));
 260 trunc:
 261         return;
 262 }
 263
 264 static int dccp_print_option(netdissect_options *, const u_char *, u_int);
 265
 266 /**
 267  * dccp_print - show dccp packet
 268  * @bp - beginning of dccp packet
 269  * @data2 - beginning of enclosing
 270  * @len - lenght of ip packet
 271  */
 272 void
 273 dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
 274            u_int len)
 275 {
 276         const struct dccp_hdr *dh;
 277         const struct ip *ip;
 278         const struct ip6_hdr *ip6;
 279         const u_char *cp;
 280         u_short sport, dport;
 281         u_int hlen;
 282         u_int fixed_hdrlen;
 283         uint8_t dccph_type;
 284
 285         dh = (const struct dccp_hdr *)bp;
 286
 287         ip = (const struct ip *)data2;
 288         if (IP_V(ip) == 6)
 289                 ip6 = (const struct ip6_hdr *)data2;
 290         else
 291                 ip6 = NULL;
 292
 293         /* make sure we have enough data to look at the X bit */
 294         cp = (const u_char *)(dh + 1);
 295         if (cp > ndo->ndo_snapend) {
 296                 ND_PRINT((ndo, "[Invalid packet|dccp]"));
 297                 return;
 298         }
 299         if (len < sizeof(struct dccp_hdr)) {
 300                 ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
 301                           len - (u_int)sizeof(struct dccp_hdr)));
 302                 return;
 303         }
 304
 305         /* get the length of the generic header */
 306         fixed_hdrlen = dccp_basic_hdr_len(dh);
 307         if (len < fixed_hdrlen) {
 308                 ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
 309                           len - fixed_hdrlen));
 310                 return;
 311         }
 312         ND_TCHECK_LEN(dh, fixed_hdrlen);
 313
 314         sport = EXTRACT_BE_U_2(dh->dccph_sport);
 315         dport = EXTRACT_BE_U_2(dh->dccph_dport);
 316         hlen = EXTRACT_U_1(dh->dccph_doff) * 4;
 317
 318         if (ip6) {
 319                 ND_PRINT((ndo, "%s.%d > %s.%d: ",
 320                           ip6addr_string(ndo, &ip6->ip6_src), sport,
 321                           ip6addr_string(ndo, &ip6->ip6_dst), dport));
 322         } else {
 323                 ND_PRINT((ndo, "%s.%d > %s.%d: ",
 324                           ipaddr_string(ndo, &ip->ip_src), sport,
 325                           ipaddr_string(ndo, &ip->ip_dst), dport));
 326         }
 327
 328         ND_PRINT((ndo, "DCCP"));
 329
 330         if (ndo->ndo_qflag) {
 331                 ND_PRINT((ndo, " %d", len - hlen));
 332                 if (hlen > len) {
 333                         ND_PRINT((ndo, " [bad hdr length %u - too long, > %u]",
 334                                   hlen, len));
 335                 }
 336                 return;
 337         }
 338
 339         /* other variables in generic header */
 340         if (ndo->ndo_vflag) {
 341                 ND_PRINT((ndo, " (CCVal %d, CsCov %d, ", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh)));
 342         }
 343
 344         /* checksum calculation */
 345         if (ndo->ndo_vflag && ND_TTEST_LEN(bp, len)) {
 346                 uint16_t sum = 0, dccp_sum;
 347
 348                 dccp_sum = EXTRACT_BE_U_2(dh->dccph_checksum);
 349                 ND_PRINT((ndo, "cksum 0x%04x ", dccp_sum));
 350                 if (IP_V(ip) == 4)
 351                         sum = dccp_cksum(ndo, ip, dh, len);
 352                 else if (IP_V(ip) == 6)
 353                         sum = dccp6_cksum(ndo, ip6, dh, len);
 354                 if (sum != 0)
 355                         ND_PRINT((ndo, "(incorrect -> 0x%04x)",in_cksum_shouldbe(dccp_sum, sum)));
 356                 else
 357                         ND_PRINT((ndo, "(correct)"));
 358         }
 359
 360         if (ndo->ndo_vflag)
 361                 ND_PRINT((ndo, ")"));
 362         ND_PRINT((ndo, " "));
 363
 364         dccph_type = DCCPH_TYPE(dh);
 365         switch (dccph_type) {
 366         case DCCP_PKT_REQUEST: {
 367                 const struct dccp_hdr_request *dhr =
 368                         (const struct dccp_hdr_request *)(bp + fixed_hdrlen);
 369                 fixed_hdrlen += 4;
 370                 if (len < fixed_hdrlen) {
 371                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 372                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 373                                   len - fixed_hdrlen));
 374                         return;
 375                 }
 376                 ND_TCHECK(*dhr);
 377                 ND_PRINT((ndo, "%s (service=%d) ",
 378                           tok2str(dccp_pkt_type_str, "", dccph_type),
 379                           EXTRACT_BE_U_4(dhr->dccph_req_service)));
 380                 break;
 381         }
 382         case DCCP_PKT_RESPONSE: {
 383                 const struct dccp_hdr_response *dhr =
 384                         (const struct dccp_hdr_response *)(bp + fixed_hdrlen);
 385                 fixed_hdrlen += 12;
 386                 if (len < fixed_hdrlen) {
 387                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 388                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 389                                   len - fixed_hdrlen));
 390                         return;
 391                 }
 392                 ND_TCHECK(*dhr);
 393                 ND_PRINT((ndo, "%s (service=%d) ",
 394                           tok2str(dccp_pkt_type_str, "", dccph_type),
 395                           EXTRACT_BE_U_4(dhr->dccph_resp_service)));
 396                 break;
 397         }
 398         case DCCP_PKT_DATA:
 399                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 400                 break;
 401         case DCCP_PKT_ACK: {
 402                 fixed_hdrlen += 8;
 403                 if (len < fixed_hdrlen) {
 404                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 405                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 406                                   len - fixed_hdrlen));
 407                         return;
 408                 }
 409                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 410                 break;
 411         }
 412         case DCCP_PKT_DATAACK: {
 413                 fixed_hdrlen += 8;
 414                 if (len < fixed_hdrlen) {
 415                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 416                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 417                                   len - fixed_hdrlen));
 418                         return;
 419                 }
 420                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 421                 break;
 422         }
 423         case DCCP_PKT_CLOSEREQ:
 424                 fixed_hdrlen += 8;
 425                 if (len < fixed_hdrlen) {
 426                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 427                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 428                                   len - fixed_hdrlen));
 429                         return;
 430                 }
 431                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 432                 break;
 433         case DCCP_PKT_CLOSE:
 434                 fixed_hdrlen += 8;
 435                 if (len < fixed_hdrlen) {
 436                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 437                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 438                                   len - fixed_hdrlen));
 439                         return;
 440                 }
 441                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 442                 break;
 443         case DCCP_PKT_RESET: {
 444                 const struct dccp_hdr_reset *dhr =
 445                         (const struct dccp_hdr_reset *)(bp + fixed_hdrlen);
 446                 fixed_hdrlen += 12;
 447                 if (len < fixed_hdrlen) {
 448                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 449                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 450                                   len - fixed_hdrlen));
 451                         return;
 452                 }
 453                 ND_TCHECK(*dhr);
 454                 ND_PRINT((ndo, "%s (code=%s) ",
 455                           tok2str(dccp_pkt_type_str, "", dccph_type),
 456                           dccp_reset_code(EXTRACT_U_1(dhr->dccph_reset_code))));
 457                 break;
 458         }
 459         case DCCP_PKT_SYNC:
 460                 fixed_hdrlen += 8;
 461                 if (len < fixed_hdrlen) {
 462                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 463                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 464                                   len - fixed_hdrlen));
 465                         return;
 466                 }
 467                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 468                 break;
 469         case DCCP_PKT_SYNCACK:
 470                 fixed_hdrlen += 8;
 471                 if (len < fixed_hdrlen) {
 472                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 473                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 474                                   len - fixed_hdrlen));
 475                         return;
 476                 }
 477                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 478                 break;
 479         default:
 480                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "unknown-type-%u", dccph_type)));
 481                 break;
 482         }
 483
 484         if ((DCCPH_TYPE(dh) != DCCP_PKT_DATA) &&
 485                         (DCCPH_TYPE(dh) != DCCP_PKT_REQUEST))
 486                 dccp_print_ack_no(ndo, bp);
 487
 488         if (ndo->ndo_vflag < 2)
 489                 return;
 490
 491         ND_PRINT((ndo, "seq %" PRIu64, dccp_seqno(bp)));
 492
 493         /* process options */
 494         if (hlen > fixed_hdrlen){
 495                 u_int optlen;
 496                 cp = bp + fixed_hdrlen;
 497                 ND_PRINT((ndo, " <"));
 498
 499                 hlen -= fixed_hdrlen;
 500                 while(1){
 501                         optlen = dccp_print_option(ndo, cp, hlen);
 502                         if (!optlen)
 503                                 break;
 504                         if (hlen <= optlen)
 505                                 break;
 506                         hlen -= optlen;
 507                         cp += optlen;
 508                         ND_PRINT((ndo, ", "));
 509                 }
 510                 ND_PRINT((ndo, ">"));
 511         }
 512         return;
 513 trunc:
 514         ND_PRINT((ndo, "%s", tstr));
 515         return;
 516 }
 517
 518 static const struct tok dccp_option_values[] = {
 519         { 0, "nop" },
 520         { 1, "mandatory" },
 521         { 2, "slowreceiver" },
 522         { 32, "change_l" },
 523         { 33, "confirm_l" },
 524         { 34, "change_r" },
 525         { 35, "confirm_r" },
 526         { 36, "initcookie" },
 527         { 37, "ndp_count" },
 528         { 38, "ack_vector0" },
 529         { 39, "ack_vector1" },
 530         { 40, "data_dropped" },
 531         { 41, "timestamp" },
 532         { 42, "timestamp_echo" },
 533         { 43, "elapsed_time" },
 534         { 44, "data_checksum" },
 535         { 0, NULL }
 536 };
 537
 538 static int dccp_print_option(netdissect_options *ndo, const u_char *option, u_int hlen)
 539 {
 540         uint8_t optlen, i;
 541
 542         ND_TCHECK_1(option);
 543
 544         if (EXTRACT_U_1(option) >= 32) {
 545                 ND_TCHECK_1(option + 1);
 546                 optlen = EXTRACT_U_1(option + 1);
 547                 if (optlen < 2) {
 548                         if (EXTRACT_U_1(option) >= 128)
 549                                 ND_PRINT((ndo, "CCID option %u optlen too short", EXTRACT_U_1(option)));
 550                         else
 551                                 ND_PRINT((ndo, "%s optlen too short",
 552                                           tok2str(dccp_option_values, "Option %u", EXTRACT_U_1(option))));
 553                         return 0;
 554                 }
 555         } else
 556                 optlen = 1;
 557
 558         if (hlen < optlen) {
 559                 if (EXTRACT_U_1(option) >= 128)
 560                         ND_PRINT((ndo, "CCID option %u optlen goes past header length",
 561                                   EXTRACT_U_1(option)));
 562                 else
 563                         ND_PRINT((ndo, "%s optlen goes past header length",
 564                                   tok2str(dccp_option_values, "Option %u", EXTRACT_U_1(option))));
 565                 return 0;
 566         }
 567         ND_TCHECK_LEN(option, optlen);
 568
 569         if (EXTRACT_U_1(option) >= 128) {
 570                 ND_PRINT((ndo, "CCID option %d", EXTRACT_U_1(option)));
 571                 switch (optlen) {
 572                         case 4:
 573                                 ND_PRINT((ndo, " %u", EXTRACT_BE_U_2(option + 2)));
 574                                 break;
 575                         case 6:
 576                                 ND_PRINT((ndo, " %u", EXTRACT_BE_U_4(option + 2)));
 577                                 break;
 578                         default:
 579                                 break;
 580                 }
 581         } else {
 582                 ND_PRINT((ndo, "%s", tok2str(dccp_option_values, "Option %u", EXTRACT_U_1(option))));
 583                 switch (EXTRACT_U_1(option)) {
 584                 case 32:
 585                 case 33:
 586                 case 34:
 587                 case 35:
 588                         if (optlen < 3) {
 589                                 ND_PRINT((ndo, " optlen too short"));
 590                                 return optlen;
 591                         }
 592                         if (EXTRACT_U_1(option + 2) < 10){
 593                                 ND_PRINT((ndo, " %s", dccp_feature_nums[EXTRACT_U_1(option + 2)]));
 594                                 for (i = 0; i < optlen - 3; i++)
 595                                         ND_PRINT((ndo, " %d", EXTRACT_U_1(option + 3 + i)));
 596                         }
 597                         break;
 598                 case 36:
 599                         if (optlen > 2) {
 600                                 ND_PRINT((ndo, " 0x"));
 601                                 for (i = 0; i < optlen - 2; i++)
 602                                         ND_PRINT((ndo, "%02x", EXTRACT_U_1(option + 2 + i)));
 603                         }
 604                         break;
 605                 case 37:
 606                         for (i = 0; i < optlen - 2; i++)
 607                                 ND_PRINT((ndo, " %d", EXTRACT_U_1(option + 2 + i)));
 608                         break;
 609                 case 38:
 610                         if (optlen > 2) {
 611                                 ND_PRINT((ndo, " 0x"));
 612                                 for (i = 0; i < optlen - 2; i++)
 613                                         ND_PRINT((ndo, "%02x", EXTRACT_U_1(option + 2 + i)));
 614                         }
 615                         break;
 616                 case 39:
 617                         if (optlen > 2) {
 618                                 ND_PRINT((ndo, " 0x"));
 619                                 for (i = 0; i < optlen - 2; i++)
 620                                         ND_PRINT((ndo, "%02x", EXTRACT_U_1(option + 2 + i)));
 621                         }
 622                         break;
 623                 case 40:
 624                         if (optlen > 2) {
 625                                 ND_PRINT((ndo, " 0x"));
 626                                 for (i = 0; i < optlen - 2; i++)
 627                                         ND_PRINT((ndo, "%02x", EXTRACT_U_1(option + 2 + i)));
 628                         }
 629                         break;
 630                 case 41:
 631                         if (optlen == 4)
 632                                 ND_PRINT((ndo, " %u", EXTRACT_BE_U_4(option + 2)));
 633                         else
 634                                 ND_PRINT((ndo, " optlen != 4"));
 635                         break;
 636                 case 42:
 637                         if (optlen == 4)
 638                                 ND_PRINT((ndo, " %u", EXTRACT_BE_U_4(option + 2)));
 639                         else
 640                                 ND_PRINT((ndo, " optlen != 4"));
 641                         break;
 642                 case 43:
 643                         if (optlen == 6)
 644                                 ND_PRINT((ndo, " %u", EXTRACT_BE_U_4(option + 2)));
 645                         else if (optlen == 4)
 646                                 ND_PRINT((ndo, " %u", EXTRACT_BE_U_2(option + 2)));
 647                         else
 648                                 ND_PRINT((ndo, " optlen != 4 or 6"));
 649                         break;
 650                 case 44:
 651                         if (optlen > 2) {
 652                                 ND_PRINT((ndo, " "));
 653                                 for (i = 0; i < optlen - 2; i++)
 654                                         ND_PRINT((ndo, "%02x", EXTRACT_U_1(option + 2 + i)));
 655                         }
 656                         break;
 657                 }
 658         }
 659
 660         return optlen;
 661 trunc:
 662         ND_PRINT((ndo, "%s", tstr));
 663         return 0;
 664 }