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 #ifdef HAVE_CONFIG_H
  11 #include "config.h"
  12 #endif
  13
  14 #include <tcpdump-stdinc.h>
  15
  16 #include <stdio.h>
  17 #include <string.h>
  18
  19 #include "interface.h"
  20 #include "addrtoname.h"
  21 #include "extract.h"                    /* must come after interface.h */
  22 #include "ip.h"
  23 #ifdef INET6
  24 #include "ip6.h"
  25 #endif
  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 *)(void *)dh, len,
 204                                 dccp_csum_coverage(dh, len), IPPROTO_DCCP);
 205 }
 206
 207 #ifdef INET6
 208 static int dccp6_cksum(const struct ip6_hdr *ip6, const struct dccp_hdr *dh, u_int len)
 209 {
 210         return nextproto6_cksum(ip6, (const uint8_t *)(void *)dh, len,
 211                                 dccp_csum_coverage(dh, len), IPPROTO_DCCP);
 212 }
 213 #endif
 214
 215 static const char *dccp_reset_code(uint8_t code)
 216 {
 217         if (code >= __DCCP_RESET_CODE_LAST)
 218                 return "invalid";
 219         return dccp_reset_codes[code];
 220 }
 221
 222 static uint64_t dccp_seqno(const u_char *bp)
 223 {
 224         const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
 225         uint64_t seqno;
 226
 227         if (DCCPH_X(dh) != 0) {
 228                 const struct dccp_hdr_ext *dhx = (const struct dccp_hdr_ext *)bp;
 229                 seqno = EXTRACT_48BITS(dhx->dccph_seq);
 230         } else {
 231                 seqno = EXTRACT_24BITS(dh->dccph_seq);
 232         }
 233
 234         return seqno;
 235 }
 236
 237 static inline unsigned int dccp_basic_hdr_len(const struct dccp_hdr *dh)
 238 {
 239         return DCCPH_X(dh) ? sizeof(struct dccp_hdr_ext) : sizeof(struct dccp_hdr);
 240 }
 241
 242 static void dccp_print_ack_no(netdissect_options *ndo, const u_char *bp)
 243 {
 244         const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
 245         const u_char *ackp = bp + dccp_basic_hdr_len(dh);
 246         uint64_t ackno;
 247
 248         if (DCCPH_X(dh) != 0) {
 249                 ND_TCHECK2(*ackp, 8);
 250                 ackno = EXTRACT_48BITS(ackp + 2);
 251         } else {
 252                 ND_TCHECK2(*ackp, 4);
 253                 ackno = EXTRACT_24BITS(ackp + 1);
 254         }
 255
 256         ND_PRINT((ndo, "(ack=%" PRIu64 ") ", ackno));
 257 trunc:
 258         return;
 259 }
 260
 261 static int dccp_print_option(netdissect_options *, const u_char *, u_int);
 262
 263 /**
 264  * dccp_print - show dccp packet
 265  * @bp - beginning of dccp packet
 266  * @data2 - beginning of enclosing
 267  * @len - lenght of ip packet
 268  */
 269 void dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
 270                 u_int len)
 271 {
 272         const struct dccp_hdr *dh;
 273         const struct ip *ip;
 274 #ifdef INET6
 275         const struct ip6_hdr *ip6;
 276 #endif
 277         const u_char *cp;
 278         u_short sport, dport;
 279         u_int hlen;
 280         u_int fixed_hdrlen;
 281         uint8_t dccph_type;
 282
 283         dh = (const struct dccp_hdr *)bp;
 284
 285         ip = (struct ip *)data2;
 286 #ifdef INET6
 287         if (IP_V(ip) == 6)
 288                 ip6 = (const struct ip6_hdr *)data2;
 289         else
 290                 ip6 = NULL;
 291 #endif /*INET6*/
 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_TCHECK2(*dh, fixed_hdrlen);
 313
 314         sport = EXTRACT_16BITS(&dh->dccph_sport);
 315         dport = EXTRACT_16BITS(&dh->dccph_dport);
 316         hlen = dh->dccph_doff * 4;
 317
 318 #ifdef INET6
 319         if (ip6) {
 320                 ND_PRINT((ndo, "%s.%d > %s.%d: ",
 321                           ip6addr_string(ndo, &ip6->ip6_src), sport,
 322                           ip6addr_string(ndo, &ip6->ip6_dst), dport));
 323         } else
 324 #endif /*INET6*/
 325         {
 326                 ND_PRINT((ndo, "%s.%d > %s.%d: ",
 327                           ipaddr_string(ndo, &ip->ip_src), sport,
 328                           ipaddr_string(ndo, &ip->ip_dst), dport));
 329         }
 330
 331         ND_PRINT((ndo, "DCCP"));
 332
 333         if (ndo->ndo_qflag) {
 334                 ND_PRINT((ndo, " %d", len - hlen));
 335                 if (hlen > len) {
 336                         ND_PRINT((ndo, " [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((ndo, " (CCVal %d, CsCov %d, ", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh)));
 345         }
 346
 347         /* checksum calculation */
 348         if (ndo->ndo_vflag && ND_TTEST2(bp[0], len)) {
 349                 uint16_t sum = 0, dccp_sum;
 350
 351                 dccp_sum = EXTRACT_16BITS(&dh->dccph_checksum);
 352                 ND_PRINT((ndo, "cksum 0x%04x ", dccp_sum));
 353                 if (IP_V(ip) == 4)
 354                         sum = dccp_cksum(ndo, ip, dh, len);
 355 #ifdef INET6
 356                 else if (IP_V(ip) == 6)
 357                         sum = dccp6_cksum(ip6, dh, len);
 358 #endif
 359                 if (sum != 0)
 360                         ND_PRINT((ndo, "(incorrect -> 0x%04x)",in_cksum_shouldbe(dccp_sum, sum)));
 361                 else
 362                         ND_PRINT((ndo, "(correct)"));
 363         }
 364
 365         if (ndo->ndo_vflag)
 366                 ND_PRINT((ndo, ")"));
 367         ND_PRINT((ndo, " "));
 368
 369         dccph_type = DCCPH_TYPE(dh);
 370         switch (dccph_type) {
 371         case DCCP_PKT_REQUEST: {
 372                 struct dccp_hdr_request *dhr =
 373                         (struct dccp_hdr_request *)(bp + fixed_hdrlen);
 374                 fixed_hdrlen += 4;
 375                 if (len < fixed_hdrlen) {
 376                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 377                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 378                                   len - fixed_hdrlen));
 379                         return;
 380                 }
 381                 ND_TCHECK(*dhr);
 382                 ND_PRINT((ndo, "%s (service=%d) ",
 383                           tok2str(dccp_pkt_type_str, "", dccph_type),
 384                           EXTRACT_32BITS(&dhr->dccph_req_service)));
 385                 break;
 386         }
 387         case DCCP_PKT_RESPONSE: {
 388                 struct dccp_hdr_response *dhr =
 389                         (struct dccp_hdr_response *)(bp + fixed_hdrlen);
 390                 fixed_hdrlen += 12;
 391                 if (len < fixed_hdrlen) {
 392                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 393                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 394                                   len - fixed_hdrlen));
 395                         return;
 396                 }
 397                 ND_TCHECK(*dhr);
 398                 ND_PRINT((ndo, "%s (service=%d) ",
 399                           tok2str(dccp_pkt_type_str, "", dccph_type),
 400                           EXTRACT_32BITS(&dhr->dccph_resp_service)));
 401                 break;
 402         }
 403         case DCCP_PKT_DATA:
 404                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 405                 break;
 406         case DCCP_PKT_ACK: {
 407                 fixed_hdrlen += 8;
 408                 if (len < fixed_hdrlen) {
 409                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 410                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 411                                   len - fixed_hdrlen));
 412                         return;
 413                 }
 414                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 415                 break;
 416         }
 417         case DCCP_PKT_DATAACK: {
 418                 fixed_hdrlen += 8;
 419                 if (len < fixed_hdrlen) {
 420                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 421                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 422                                   len - fixed_hdrlen));
 423                         return;
 424                 }
 425                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 426                 break;
 427         }
 428         case DCCP_PKT_CLOSEREQ:
 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_CLOSE:
 439                 fixed_hdrlen += 8;
 440                 if (len < fixed_hdrlen) {
 441                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 442                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 443                                   len - fixed_hdrlen));
 444                         return;
 445                 }
 446                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 447                 break;
 448         case DCCP_PKT_RESET: {
 449                 struct dccp_hdr_reset *dhr =
 450                         (struct dccp_hdr_reset *)(bp + fixed_hdrlen);
 451                 fixed_hdrlen += 12;
 452                 if (len < fixed_hdrlen) {
 453                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 454                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 455                                   len - fixed_hdrlen));
 456                         return;
 457                 }
 458                 ND_TCHECK(*dhr);
 459                 ND_PRINT((ndo, "%s (code=%s) ",
 460                           tok2str(dccp_pkt_type_str, "", dccph_type),
 461                           dccp_reset_code(dhr->dccph_reset_code)));
 462                 break;
 463         }
 464         case DCCP_PKT_SYNC:
 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         case DCCP_PKT_SYNCACK:
 475                 fixed_hdrlen += 8;
 476                 if (len < fixed_hdrlen) {
 477                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 478                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 479                                   len - fixed_hdrlen));
 480                         return;
 481                 }
 482                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 483                 break;
 484         default:
 485                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "unknown-type-%u", dccph_type)));
 486                 break;
 487         }
 488
 489         if ((DCCPH_TYPE(dh) != DCCP_PKT_DATA) &&
 490                         (DCCPH_TYPE(dh) != DCCP_PKT_REQUEST))
 491                 dccp_print_ack_no(ndo, bp);
 492
 493         if (ndo->ndo_vflag < 2)
 494                 return;
 495
 496         ND_PRINT((ndo, "seq %" PRIu64, dccp_seqno(bp)));
 497
 498         /* process options */
 499         if (hlen > fixed_hdrlen){
 500                 const u_char *cp;
 501                 u_int optlen;
 502                 cp = bp + fixed_hdrlen;
 503                 ND_PRINT((ndo, " <"));
 504
 505                 hlen -= fixed_hdrlen;
 506                 while(1){
 507                         optlen = dccp_print_option(ndo, cp, hlen);
 508                         if (!optlen)
 509                                 break;
 510                         if (hlen <= optlen)
 511                                 break;
 512                         hlen -= optlen;
 513                         cp += optlen;
 514                         ND_PRINT((ndo, ", "));
 515                 }
 516                 ND_PRINT((ndo, ">"));
 517         }
 518         return;
 519 trunc:
 520         ND_PRINT((ndo, "%s", tstr));
 521         return;
 522 }
 523
 524 static const struct tok dccp_option_values[] = {
 525         { 0, "nop" },
 526         { 1, "mandatory" },
 527         { 2, "slowreceiver" },
 528         { 32, "change_l" },
 529         { 33, "confirm_l" },
 530         { 34, "change_r" },
 531         { 35, "confirm_r" },
 532         { 36, "initcookie" },
 533         { 37, "ndp_count" },
 534         { 38, "ack_vector0" },
 535         { 39, "ack_vector1" },
 536         { 40, "data_dropped" },
 537         { 41, "timestamp" },
 538         { 42, "timestamp_echo" },
 539         { 43, "elapsed_time" },
 540         { 44, "data_checksum" },
 541         { 0, NULL }
 542 };
 543
 544 static int dccp_print_option(netdissect_options *ndo, const u_char *option, u_int hlen)
 545 {
 546         uint8_t optlen, i;
 547
 548         ND_TCHECK(*option);
 549
 550         if (*option >= 32) {
 551                 ND_TCHECK(*(option+1));
 552                 optlen = *(option +1);
 553                 if (optlen < 2) {
 554                         if (*option >= 128)
 555                                 ND_PRINT((ndo, "CCID option %u optlen too short", *option));
 556                         else
 557                                 ND_PRINT((ndo, "%s optlen too short",
 558                                           tok2str(dccp_option_values, "Option %u", *option)));
 559                         return 0;
 560                 }
 561         } else
 562                 optlen = 1;
 563
 564         if (hlen < optlen) {
 565                 if (*option >= 128)
 566                         ND_PRINT((ndo, "CCID option %u optlen goes past header length",
 567                                   *option));
 568                 else
 569                         ND_PRINT((ndo, "%s optlen goes past header length",
 570                                   tok2str(dccp_option_values, "Option %u", *option)));
 571                 return 0;
 572         }
 573         ND_TCHECK2(*option, optlen);
 574
 575         if (*option >= 128) {
 576                 ND_PRINT((ndo, "CCID option %d", *option));
 577                 switch (optlen) {
 578                         case 4:
 579                                 ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2)));
 580                                 break;
 581                         case 6:
 582                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 583                                 break;
 584                         default:
 585                                 break;
 586                 }
 587         } else {
 588                 ND_PRINT((ndo, "%s", tok2str(dccp_option_values, "Option %u", *option)));
 589                 switch (*option) {
 590                 case 32:
 591                 case 33:
 592                 case 34:
 593                 case 35:
 594                         if (optlen < 3) {
 595                                 ND_PRINT((ndo, " optlen too short"));
 596                                 return optlen;
 597                         }
 598                         if (*(option + 2) < 10){
 599                                 ND_PRINT((ndo, " %s", dccp_feature_nums[*(option + 2)]));
 600                                 for (i = 0; i < optlen - 3; i++)
 601                                         ND_PRINT((ndo, " %d", *(option + 3 + i)));
 602                         }
 603                         break;
 604                 case 36:
 605                         if (optlen > 2) {
 606                                 ND_PRINT((ndo, " 0x"));
 607                                 for (i = 0; i < optlen - 2; i++)
 608                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 609                         }
 610                         break;
 611                 case 37:
 612                         for (i = 0; i < optlen - 2; i++)
 613                                 ND_PRINT((ndo, " %d", *(option + 2 + i)));
 614                         break;
 615                 case 38:
 616                         if (optlen > 2) {
 617                                 ND_PRINT((ndo, " 0x"));
 618                                 for (i = 0; i < optlen - 2; i++)
 619                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 620                         }
 621                         break;
 622                 case 39:
 623                         if (optlen > 2) {
 624                                 ND_PRINT((ndo, " 0x"));
 625                                 for (i = 0; i < optlen - 2; i++)
 626                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 627                         }
 628                         break;
 629                 case 40:
 630                         if (optlen > 2) {
 631                                 ND_PRINT((ndo, " 0x"));
 632                                 for (i = 0; i < optlen - 2; i++)
 633                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 634                         }
 635                         break;
 636                 case 41:
 637                         if (optlen == 4)
 638                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 639                         else
 640                                 ND_PRINT((ndo, " optlen != 4"));
 641                         break;
 642                 case 42:
 643                         if (optlen == 4)
 644                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 645                         else
 646                                 ND_PRINT((ndo, " optlen != 4"));
 647                         break;
 648                 case 43:
 649                         if (optlen == 6)
 650                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 651                         else if (optlen == 4)
 652                                 ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2)));
 653                         else
 654                                 ND_PRINT((ndo, " optlen != 4 or 6"));
 655                         break;
 656                 case 44:
 657                         if (optlen > 2) {
 658                                 ND_PRINT((ndo, " "));
 659                                 for (i = 0; i < optlen - 2; i++)
 660                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 661                         }
 662                         break;
 663                 }
 664         }
 665
 666         return optlen;
 667 trunc:
 668         ND_PRINT((ndo, "%s", tstr));
 669         return 0;
 670 }