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