contrib/tcpdump/print-dccp.c

   1 /*
   2  * Copyright (C) Arnaldo Carvalho de Melo 2004
   3  * Copyright (C) Ian McDonald 2005
   4  * Copyright (C) Yoshifumi Nishida 2005
   5  *
   6  * This software may be distributed either under the terms of the
   7  * BSD-style license that accompanies tcpdump or the GNU GPL version 2
   8  */
   9
  10 #define NETDISSECT_REWORKED
  11 #ifdef HAVE_CONFIG_H
  12 #include "config.h"
  13 #endif
  14
  15 #include <tcpdump-stdinc.h>
  16
  17 #include <stdio.h>
  18 #include <string.h>
  19
  20 #include "interface.h"
  21 #include "addrtoname.h"
  22 #include "extract.h"                    /* must come after interface.h */
  23 #include "ip.h"
  24 #ifdef INET6
  25 #include "ip6.h"
  26 #endif
  27 #include "ipproto.h"
  28
  29 /* RFC4340: Datagram Congestion Control Protocol (DCCP) */
  30
  31 /**
  32  * struct dccp_hdr - generic part of DCCP packet header, with a 24-bit
  33  * sequence number
  34  *
  35  * @dccph_sport - Relevant port on the endpoint that sent this packet
  36  * @dccph_dport - Relevant port on the other endpoint
  37  * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
  38  * @dccph_ccval - Used by the HC-Sender CCID
  39  * @dccph_cscov - Parts of the packet that are covered by the Checksum field
  40  * @dccph_checksum - Internet checksum, depends on dccph_cscov
  41  * @dccph_x - 0 = 24 bit sequence number, 1 = 48
  42  * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
  43  * @dccph_seq - 24-bit sequence number
  44  */
  45 struct dccp_hdr {
  46         uint16_t        dccph_sport,
  47                         dccph_dport;
  48         uint8_t         dccph_doff;
  49         uint8_t         dccph_ccval_cscov;
  50         uint16_t        dccph_checksum;
  51         uint8_t         dccph_xtr;
  52         uint8_t         dccph_seq[3];
  53 } UNALIGNED;
  54
  55 /**
  56  * struct dccp_hdr_ext - generic part of DCCP packet header, with a 48-bit
  57  * sequence number
  58  *
  59  * @dccph_sport - Relevant port on the endpoint that sent this packet
  60  * @dccph_dport - Relevant port on the other endpoint
  61  * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
  62  * @dccph_ccval - Used by the HC-Sender CCID
  63  * @dccph_cscov - Parts of the packet that are covered by the Checksum field
  64  * @dccph_checksum - Internet checksum, depends on dccph_cscov
  65  * @dccph_x - 0 = 24 bit sequence number, 1 = 48
  66  * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
  67  * @dccph_seq - 48-bit sequence number
  68  */
  69 struct dccp_hdr_ext {
  70         uint16_t        dccph_sport,
  71                         dccph_dport;
  72         uint8_t         dccph_doff;
  73         uint8_t         dccph_ccval_cscov;
  74         uint16_t        dccph_checksum;
  75         uint8_t         dccph_xtr;
  76         uint8_t         reserved;
  77         uint8_t         dccph_seq[6];
  78 } UNALIGNED;
  79
  80 #define DCCPH_CCVAL(dh) (((dh)->dccph_ccval_cscov >> 4) & 0xF)
  81 #define DCCPH_CSCOV(dh) (((dh)->dccph_ccval_cscov) & 0xF)
  82
  83 #define DCCPH_X(dh)     ((dh)->dccph_xtr & 1)
  84 #define DCCPH_TYPE(dh)  (((dh)->dccph_xtr >> 1) & 0xF)
  85
  86 /**
  87  * struct dccp_hdr_request - Conection initiation request header
  88  *
  89  * @dccph_req_service - Service to which the client app wants to connect
  90  */
  91 struct dccp_hdr_request {
  92         uint32_t        dccph_req_service;
  93 } UNALIGNED;
  94
  95 /**
  96  * struct dccp_hdr_response - Conection initiation response header
  97  *
  98  * @dccph_resp_ack - 48 bit ack number, contains GSR
  99  * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
 100  */
 101 struct dccp_hdr_response {
 102         uint8_t                         dccph_resp_ack[8];      /* always 8 bytes */
 103         uint32_t                        dccph_resp_service;
 104 } UNALIGNED;
 105
 106 /**
 107  * struct dccp_hdr_reset - Unconditionally shut down a connection
 108  *
 109  * @dccph_resp_ack - 48 bit ack number
 110  * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
 111  */
 112 struct dccp_hdr_reset {
 113         uint8_t                         dccph_reset_ack[8];     /* always 8 bytes */
 114         uint8_t                         dccph_reset_code,
 115                                         dccph_reset_data[3];
 116 } UNALIGNED;
 117
 118 enum dccp_pkt_type {
 119         DCCP_PKT_REQUEST = 0,
 120         DCCP_PKT_RESPONSE,
 121         DCCP_PKT_DATA,
 122         DCCP_PKT_ACK,
 123         DCCP_PKT_DATAACK,
 124         DCCP_PKT_CLOSEREQ,
 125         DCCP_PKT_CLOSE,
 126         DCCP_PKT_RESET,
 127         DCCP_PKT_SYNC,
 128         DCCP_PKT_SYNCACK
 129 };
 130
 131 static const struct tok dccp_pkt_type_str[] = {
 132         { DCCP_PKT_REQUEST, "DCCP-Request" },
 133         { DCCP_PKT_RESPONSE, "DCCP-Response" },
 134         { DCCP_PKT_DATA, "DCCP-Data" },
 135         { DCCP_PKT_ACK, "DCCP-Ack" },
 136         { DCCP_PKT_DATAACK, "DCCP-DataAck" },
 137         { DCCP_PKT_CLOSEREQ, "DCCP-CloseReq" },
 138         { DCCP_PKT_CLOSE, "DCCP-Close" },
 139         { DCCP_PKT_RESET, "DCCP-Reset" },
 140         { DCCP_PKT_SYNC, "DCCP-Sync" },
 141         { DCCP_PKT_SYNCACK, "DCCP-SyncAck" },
 142         { 0, NULL}
 143 };
 144
 145 enum dccp_reset_codes {
 146         DCCP_RESET_CODE_UNSPECIFIED = 0,
 147         DCCP_RESET_CODE_CLOSED,
 148         DCCP_RESET_CODE_ABORTED,
 149         DCCP_RESET_CODE_NO_CONNECTION,
 150         DCCP_RESET_CODE_PACKET_ERROR,
 151         DCCP_RESET_CODE_OPTION_ERROR,
 152         DCCP_RESET_CODE_MANDATORY_ERROR,
 153         DCCP_RESET_CODE_CONNECTION_REFUSED,
 154         DCCP_RESET_CODE_BAD_SERVICE_CODE,
 155         DCCP_RESET_CODE_TOO_BUSY,
 156         DCCP_RESET_CODE_BAD_INIT_COOKIE,
 157         DCCP_RESET_CODE_AGGRESSION_PENALTY,
 158         __DCCP_RESET_CODE_LAST
 159 };
 160
 161 static const char tstr[] = "[|dccp]";
 162
 163 static const char *dccp_reset_codes[] = {
 164         "unspecified",
 165         "closed",
 166         "aborted",
 167         "no_connection",
 168         "packet_error",
 169         "option_error",
 170         "mandatory_error",
 171         "connection_refused",
 172         "bad_service_code",
 173         "too_busy",
 174         "bad_init_cookie",
 175         "aggression_penalty",
 176 };
 177
 178 static const char *dccp_feature_nums[] = {
 179         "reserved",
 180         "ccid",
 181         "allow_short_seqno",
 182         "sequence_window",
 183         "ecn_incapable",
 184         "ack_ratio",
 185         "send_ack_vector",
 186         "send_ndp_count",
 187         "minimum checksum coverage",
 188         "check data checksum",
 189 };
 190
 191 static inline u_int dccp_csum_coverage(const struct dccp_hdr* dh, u_int len)
 192 {
 193         u_int cov;
 194
 195         if (DCCPH_CSCOV(dh) == 0)
 196                 return len;
 197         cov = (dh->dccph_doff + DCCPH_CSCOV(dh) - 1) * sizeof(uint32_t);
 198         return (cov > len)? len : cov;
 199 }
 200
 201 static int dccp_cksum(netdissect_options *ndo, const struct ip *ip,
 202         const struct dccp_hdr *dh, u_int len)
 203 {
 204         return nextproto4_cksum(ndo, ip, (const uint8_t *)(void *)dh, len,
 205                                 dccp_csum_coverage(dh, len), IPPROTO_DCCP);
 206 }
 207
 208 #ifdef INET6
 209 static int dccp6_cksum(const struct ip6_hdr *ip6, const struct dccp_hdr *dh, u_int len)
 210 {
 211         return nextproto6_cksum(ip6, (const uint8_t *)(void *)dh, len,
 212                                 dccp_csum_coverage(dh, len), IPPROTO_DCCP);
 213 }
 214 #endif
 215
 216 static const char *dccp_reset_code(uint8_t code)
 217 {
 218         if (code >= __DCCP_RESET_CODE_LAST)
 219                 return "invalid";
 220         return dccp_reset_codes[code];
 221 }
 222
 223 static uint64_t dccp_seqno(const u_char *bp)
 224 {
 225         const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
 226         uint64_t seqno;
 227
 228         if (DCCPH_X(dh) != 0) {
 229                 const struct dccp_hdr_ext *dhx = (const struct dccp_hdr_ext *)bp;
 230                 seqno = EXTRACT_48BITS(dhx->dccph_seq);
 231         } else {
 232                 seqno = EXTRACT_24BITS(dh->dccph_seq);
 233         }
 234
 235         return seqno;
 236 }
 237
 238 static inline unsigned int dccp_basic_hdr_len(const struct dccp_hdr *dh)
 239 {
 240         return DCCPH_X(dh) ? sizeof(struct dccp_hdr_ext) : sizeof(struct dccp_hdr);
 241 }
 242
 243 static void dccp_print_ack_no(netdissect_options *ndo, const u_char *bp)
 244 {
 245         const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
 246         const u_char *ackp = bp + dccp_basic_hdr_len(dh);
 247         uint64_t ackno;
 248
 249         if (DCCPH_X(dh) != 0) {
 250                 ND_TCHECK2(*ackp, 8);
 251                 ackno = EXTRACT_48BITS(ackp + 2);
 252         } else {
 253                 ND_TCHECK2(*ackp, 4);
 254                 ackno = EXTRACT_24BITS(ackp + 1);
 255         }
 256
 257         ND_PRINT((ndo, "(ack=%" PRIu64 ") ", ackno));
 258 trunc:
 259         return;
 260 }
 261
 262 static int dccp_print_option(netdissect_options *, const u_char *, u_int);
 263
 264 /**
 265  * dccp_print - show dccp packet
 266  * @bp - beginning of dccp packet
 267  * @data2 - beginning of enclosing
 268  * @len - lenght of ip packet
 269  */
 270 void dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
 271                 u_int len)
 272 {
 273         const struct dccp_hdr *dh;
 274         const struct ip *ip;
 275 #ifdef INET6
 276         const struct ip6_hdr *ip6;
 277 #endif
 278         const u_char *cp;
 279         u_short sport, dport;
 280         u_int hlen;
 281         u_int fixed_hdrlen;
 282         uint8_t dccph_type;
 283
 284         dh = (const struct dccp_hdr *)bp;
 285
 286         ip = (struct ip *)data2;
 287 #ifdef INET6
 288         if (IP_V(ip) == 6)
 289                 ip6 = (const struct ip6_hdr *)data2;
 290         else
 291                 ip6 = NULL;
 292 #endif /*INET6*/
 293
 294         /* make sure we have enough data to look at the X bit */
 295         cp = (const u_char *)(dh + 1);
 296         if (cp > ndo->ndo_snapend) {
 297                 ND_PRINT((ndo, "[Invalid packet|dccp]"));
 298                 return;
 299         }
 300         if (len < sizeof(struct dccp_hdr)) {
 301                 ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
 302                           len - (u_int)sizeof(struct dccp_hdr)));
 303                 return;
 304         }
 305
 306         /* get the length of the generic header */
 307         fixed_hdrlen = dccp_basic_hdr_len(dh);
 308         if (len < fixed_hdrlen) {
 309                 ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
 310                           len - fixed_hdrlen));
 311                 return;
 312         }
 313         ND_TCHECK2(*dh, fixed_hdrlen);
 314
 315         sport = EXTRACT_16BITS(&dh->dccph_sport);
 316         dport = EXTRACT_16BITS(&dh->dccph_dport);
 317         hlen = dh->dccph_doff * 4;
 318
 319 #ifdef INET6
 320         if (ip6) {
 321                 ND_PRINT((ndo, "%s.%d > %s.%d: ",
 322                           ip6addr_string(ndo, &ip6->ip6_src), sport,
 323                           ip6addr_string(ndo, &ip6->ip6_dst), dport));
 324         } else
 325 #endif /*INET6*/
 326         {
 327                 ND_PRINT((ndo, "%s.%d > %s.%d: ",
 328                           ipaddr_string(ndo, &ip->ip_src), sport,
 329                           ipaddr_string(ndo, &ip->ip_dst), dport));
 330         }
 331
 332         ND_PRINT((ndo, "DCCP"));
 333
 334         if (ndo->ndo_qflag) {
 335                 ND_PRINT((ndo, " %d", len - hlen));
 336                 if (hlen > len) {
 337                         ND_PRINT((ndo, " [bad hdr length %u - too long, > %u]",
 338                                   hlen, len));
 339                 }
 340                 return;
 341         }
 342
 343         /* other variables in generic header */
 344         if (ndo->ndo_vflag) {
 345                 ND_PRINT((ndo, " (CCVal %d, CsCov %d, ", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh)));
 346         }
 347
 348         /* checksum calculation */
 349         if (ndo->ndo_vflag && ND_TTEST2(bp[0], len)) {
 350                 uint16_t sum = 0, dccp_sum;
 351
 352                 dccp_sum = EXTRACT_16BITS(&dh->dccph_checksum);
 353                 ND_PRINT((ndo, "cksum 0x%04x ", dccp_sum));
 354                 if (IP_V(ip) == 4)
 355                         sum = dccp_cksum(ndo, ip, dh, len);
 356 #ifdef INET6
 357                 else if (IP_V(ip) == 6)
 358                         sum = dccp6_cksum(ip6, dh, len);
 359 #endif
 360                 if (sum != 0)
 361                         ND_PRINT((ndo, "(incorrect -> 0x%04x)",in_cksum_shouldbe(dccp_sum, sum)));
 362                 else
 363                         ND_PRINT((ndo, "(correct)"));
 364         }
 365
 366         if (ndo->ndo_vflag)
 367                 ND_PRINT((ndo, ")"));
 368         ND_PRINT((ndo, " "));
 369
 370         dccph_type = DCCPH_TYPE(dh);
 371         switch (dccph_type) {
 372         case DCCP_PKT_REQUEST: {
 373                 struct dccp_hdr_request *dhr =
 374                         (struct dccp_hdr_request *)(bp + fixed_hdrlen);
 375                 fixed_hdrlen += 4;
 376                 if (len < fixed_hdrlen) {
 377                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 378                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 379                                   len - fixed_hdrlen));
 380                         return;
 381                 }
 382                 ND_TCHECK(*dhr);
 383                 ND_PRINT((ndo, "%s (service=%d) ",
 384                           tok2str(dccp_pkt_type_str, "", dccph_type),
 385                           EXTRACT_32BITS(&dhr->dccph_req_service)));
 386                 break;
 387         }
 388         case DCCP_PKT_RESPONSE: {
 389                 struct dccp_hdr_response *dhr =
 390                         (struct dccp_hdr_response *)(bp + fixed_hdrlen);
 391                 fixed_hdrlen += 12;
 392                 if (len < fixed_hdrlen) {
 393                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 394                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 395                                   len - fixed_hdrlen));
 396                         return;
 397                 }
 398                 ND_TCHECK(*dhr);
 399                 ND_PRINT((ndo, "%s (service=%d) ",
 400                           tok2str(dccp_pkt_type_str, "", dccph_type),
 401                           EXTRACT_32BITS(&dhr->dccph_resp_service)));
 402                 break;
 403         }
 404         case DCCP_PKT_DATA:
 405                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 406                 break;
 407         case DCCP_PKT_ACK: {
 408                 fixed_hdrlen += 8;
 409                 if (len < fixed_hdrlen) {
 410                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 411                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 412                                   len - fixed_hdrlen));
 413                         return;
 414                 }
 415                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 416                 break;
 417         }
 418         case DCCP_PKT_DATAACK: {
 419                 fixed_hdrlen += 8;
 420                 if (len < fixed_hdrlen) {
 421                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 422                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 423                                   len - fixed_hdrlen));
 424                         return;
 425                 }
 426                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 427                 break;
 428         }
 429         case DCCP_PKT_CLOSEREQ:
 430                 fixed_hdrlen += 8;
 431                 if (len < fixed_hdrlen) {
 432                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 433                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 434                                   len - fixed_hdrlen));
 435                         return;
 436                 }
 437                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 438                 break;
 439         case DCCP_PKT_CLOSE:
 440                 fixed_hdrlen += 8;
 441                 if (len < fixed_hdrlen) {
 442                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 443                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 444                                   len - fixed_hdrlen));
 445                         return;
 446                 }
 447                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 448                 break;
 449         case DCCP_PKT_RESET: {
 450                 struct dccp_hdr_reset *dhr =
 451                         (struct dccp_hdr_reset *)(bp + fixed_hdrlen);
 452                 fixed_hdrlen += 12;
 453                 if (len < fixed_hdrlen) {
 454                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 455                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 456                                   len - fixed_hdrlen));
 457                         return;
 458                 }
 459                 ND_TCHECK(*dhr);
 460                 ND_PRINT((ndo, "%s (code=%s) ",
 461                           tok2str(dccp_pkt_type_str, "", dccph_type),
 462                           dccp_reset_code(dhr->dccph_reset_code)));
 463                 break;
 464         }
 465         case DCCP_PKT_SYNC:
 466                 fixed_hdrlen += 8;
 467                 if (len < fixed_hdrlen) {
 468                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 469                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 470                                   len - fixed_hdrlen));
 471                         return;
 472                 }
 473                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 474                 break;
 475         case DCCP_PKT_SYNCACK:
 476                 fixed_hdrlen += 8;
 477                 if (len < fixed_hdrlen) {
 478                         ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
 479                                   tok2str(dccp_pkt_type_str, "", dccph_type),
 480                                   len - fixed_hdrlen));
 481                         return;
 482                 }
 483                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
 484                 break;
 485         default:
 486                 ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "unknown-type-%u", dccph_type)));
 487                 break;
 488         }
 489
 490         if ((DCCPH_TYPE(dh) != DCCP_PKT_DATA) &&
 491                         (DCCPH_TYPE(dh) != DCCP_PKT_REQUEST))
 492                 dccp_print_ack_no(ndo, bp);
 493
 494         if (ndo->ndo_vflag < 2)
 495                 return;
 496
 497         ND_PRINT((ndo, "seq %" PRIu64, dccp_seqno(bp)));
 498
 499         /* process options */
 500         if (hlen > fixed_hdrlen){
 501                 const u_char *cp;
 502                 u_int optlen;
 503                 cp = bp + fixed_hdrlen;
 504                 ND_PRINT((ndo, " <"));
 505
 506                 hlen -= fixed_hdrlen;
 507                 while(1){
 508                         optlen = dccp_print_option(ndo, cp, hlen);
 509                         if (!optlen)
 510                                 break;
 511                         if (hlen <= optlen)
 512                                 break;
 513                         hlen -= optlen;
 514                         cp += optlen;
 515                         ND_PRINT((ndo, ", "));
 516                 }
 517                 ND_PRINT((ndo, ">"));
 518         }
 519         return;
 520 trunc:
 521         ND_PRINT((ndo, "%s", tstr));
 522         return;
 523 }
 524
 525 static const struct tok dccp_option_values[] = {
 526         { 0, "nop" },
 527         { 1, "mandatory" },
 528         { 2, "slowreceiver" },
 529         { 32, "change_l" },
 530         { 33, "confirm_l" },
 531         { 34, "change_r" },
 532         { 35, "confirm_r" },
 533         { 36, "initcookie" },
 534         { 37, "ndp_count" },
 535         { 38, "ack_vector0" },
 536         { 39, "ack_vector1" },
 537         { 40, "data_dropped" },
 538         { 41, "timestamp" },
 539         { 42, "timestamp_echo" },
 540         { 43, "elapsed_time" },
 541         { 44, "data_checksum" },
 542         { 0, NULL }
 543 };
 544
 545 static int dccp_print_option(netdissect_options *ndo, const u_char *option, u_int hlen)
 546 {
 547         uint8_t optlen, i;
 548
 549         ND_TCHECK(*option);
 550
 551         if (*option >= 32) {
 552                 ND_TCHECK(*(option+1));
 553                 optlen = *(option +1);
 554                 if (optlen < 2) {
 555                         if (*option >= 128)
 556                                 ND_PRINT((ndo, "CCID option %u optlen too short", *option));
 557                         else
 558                                 ND_PRINT((ndo, "%s optlen too short",
 559                                           tok2str(dccp_option_values, "Option %u", *option)));
 560                         return 0;
 561                 }
 562         } else
 563                 optlen = 1;
 564
 565         if (hlen < optlen) {
 566                 if (*option >= 128)
 567                         ND_PRINT((ndo, "CCID option %u optlen goes past header length",
 568                                   *option));
 569                 else
 570                         ND_PRINT((ndo, "%s optlen goes past header length",
 571                                   tok2str(dccp_option_values, "Option %u", *option)));
 572                 return 0;
 573         }
 574         ND_TCHECK2(*option, optlen);
 575
 576         if (*option >= 128) {
 577                 ND_PRINT((ndo, "CCID option %d", *option));
 578                 switch (optlen) {
 579                         case 4:
 580                                 ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2)));
 581                                 break;
 582                         case 6:
 583                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 584                                 break;
 585                         default:
 586                                 break;
 587                 }
 588         } else {
 589                 ND_PRINT((ndo, "%s", tok2str(dccp_option_values, "Option %u", *option)));
 590                 switch (*option) {
 591                 case 32:
 592                 case 33:
 593                 case 34:
 594                 case 35:
 595                         if (optlen < 3) {
 596                                 ND_PRINT((ndo, " optlen too short"));
 597                                 return optlen;
 598                         }
 599                         if (*(option + 2) < 10){
 600                                 ND_PRINT((ndo, " %s", dccp_feature_nums[*(option + 2)]));
 601                                 for (i = 0; i < optlen - 3; i++)
 602                                         ND_PRINT((ndo, " %d", *(option + 3 + i)));
 603                         }
 604                         break;
 605                 case 36:
 606                         if (optlen > 2) {
 607                                 ND_PRINT((ndo, " 0x"));
 608                                 for (i = 0; i < optlen - 2; i++)
 609                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 610                         }
 611                         break;
 612                 case 37:
 613                         for (i = 0; i < optlen - 2; i++)
 614                                 ND_PRINT((ndo, " %d", *(option + 2 + i)));
 615                         break;
 616                 case 38:
 617                         if (optlen > 2) {
 618                                 ND_PRINT((ndo, " 0x"));
 619                                 for (i = 0; i < optlen - 2; i++)
 620                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 621                         }
 622                         break;
 623                 case 39:
 624                         if (optlen > 2) {
 625                                 ND_PRINT((ndo, " 0x"));
 626                                 for (i = 0; i < optlen - 2; i++)
 627                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 628                         }
 629                         break;
 630                 case 40:
 631                         if (optlen > 2) {
 632                                 ND_PRINT((ndo, " 0x"));
 633                                 for (i = 0; i < optlen - 2; i++)
 634                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 635                         }
 636                         break;
 637                 case 41:
 638                         if (optlen == 4)
 639                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 640                         else
 641                                 ND_PRINT((ndo, " optlen != 4"));
 642                         break;
 643                 case 42:
 644                         if (optlen == 4)
 645                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 646                         else
 647                                 ND_PRINT((ndo, " optlen != 4"));
 648                         break;
 649                 case 43:
 650                         if (optlen == 6)
 651                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 652                         else if (optlen == 4)
 653                                 ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2)));
 654                         else
 655                                 ND_PRINT((ndo, " optlen != 4 or 6"));
 656                         break;
 657                 case 44:
 658                         if (optlen > 2) {
 659                                 ND_PRINT((ndo, " "));
 660                                 for (i = 0; i < optlen - 2; i++)
 661                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 662                         }
 663                         break;
 664                 }
 665         }
 666
 667         return optlen;
 668 trunc:
 669         ND_PRINT((ndo, "%s", tstr));
 670         return 0;
 671 }