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 #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 /**
  30  * struct dccp_hdr - generic part of DCCP packet header, with a 24-bit
  31  * sequence number
  32  *
  33  * @dccph_sport - Relevant port on the endpoint that sent this packet
  34  * @dccph_dport - Relevant port on the other endpoint
  35  * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
  36  * @dccph_ccval - Used by the HC-Sender CCID
  37  * @dccph_cscov - Parts of the packet that are covered by the Checksum field
  38  * @dccph_checksum - Internet checksum, depends on dccph_cscov
  39  * @dccph_x - 0 = 24 bit sequence number, 1 = 48
  40  * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
  41  * @dccph_seq - 24-bit sequence number
  42  */
  43 struct dccp_hdr {
  44         u_int16_t       dccph_sport,
  45                         dccph_dport;
  46         u_int8_t        dccph_doff;
  47         u_int8_t        dccph_ccval_cscov;
  48         u_int16_t       dccph_checksum;
  49         u_int8_t        dccph_xtr;
  50         u_int8_t        dccph_seq[3];
  51 } UNALIGNED;
  52
  53 /**
  54  * struct dccp_hdr_ext - generic part of DCCP packet header, with a 48-bit
  55  * sequence number
  56  *
  57  * @dccph_sport - Relevant port on the endpoint that sent this packet
  58  * @dccph_dport - Relevant port on the other endpoint
  59  * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
  60  * @dccph_ccval - Used by the HC-Sender CCID
  61  * @dccph_cscov - Parts of the packet that are covered by the Checksum field
  62  * @dccph_checksum - Internet checksum, depends on dccph_cscov
  63  * @dccph_x - 0 = 24 bit sequence number, 1 = 48
  64  * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
  65  * @dccph_seq - 48-bit sequence number
  66  */
  67 struct dccp_hdr_ext {
  68         u_int16_t       dccph_sport,
  69                         dccph_dport;
  70         u_int8_t        dccph_doff;
  71         u_int8_t        dccph_ccval_cscov;
  72         u_int16_t       dccph_checksum;
  73         u_int8_t        dccph_xtr;
  74         u_int8_t        reserved;
  75         u_int8_t        dccph_seq[6];
  76 } UNALIGNED;
  77
  78 #define DCCPH_CCVAL(dh) (((dh)->dccph_ccval_cscov >> 4) & 0xF)
  79 #define DCCPH_CSCOV(dh) (((dh)->dccph_ccval_cscov) & 0xF)
  80
  81 #define DCCPH_X(dh)     ((dh)->dccph_xtr & 1)
  82 #define DCCPH_TYPE(dh)  (((dh)->dccph_xtr >> 1) & 0xF)
  83
  84 /**
  85  * struct dccp_hdr_request - Conection initiation request header
  86  *
  87  * @dccph_req_service - Service to which the client app wants to connect
  88  */
  89 struct dccp_hdr_request {
  90         u_int32_t       dccph_req_service;
  91 } UNALIGNED;
  92
  93 /**
  94  * struct dccp_hdr_response - Conection initiation response header
  95  *
  96  * @dccph_resp_ack - 48 bit ack number, contains GSR
  97  * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
  98  */
  99 struct dccp_hdr_response {
 100         u_int8_t                        dccph_resp_ack[8];      /* always 8 bytes */
 101         u_int32_t                       dccph_resp_service;
 102 } UNALIGNED;
 103
 104 /**
 105  * struct dccp_hdr_reset - Unconditionally shut down a connection
 106  *
 107  * @dccph_resp_ack - 48 bit ack number
 108  * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
 109  */
 110 struct dccp_hdr_reset {
 111         u_int8_t                        dccph_reset_ack[8];     /* always 8 bytes */
 112         u_int8_t                        dccph_reset_code,
 113                                         dccph_reset_data[3];
 114 } UNALIGNED;
 115
 116 enum dccp_pkt_type {
 117         DCCP_PKT_REQUEST = 0,
 118         DCCP_PKT_RESPONSE,
 119         DCCP_PKT_DATA,
 120         DCCP_PKT_ACK,
 121         DCCP_PKT_DATAACK,
 122         DCCP_PKT_CLOSEREQ,
 123         DCCP_PKT_CLOSE,
 124         DCCP_PKT_RESET,
 125         DCCP_PKT_SYNC,
 126         DCCP_PKT_SYNCACK,
 127         DCCP_PKT_INVALID
 128 };
 129
 130 enum dccp_reset_codes {
 131         DCCP_RESET_CODE_UNSPECIFIED = 0,
 132         DCCP_RESET_CODE_CLOSED,
 133         DCCP_RESET_CODE_ABORTED,
 134         DCCP_RESET_CODE_NO_CONNECTION,
 135         DCCP_RESET_CODE_PACKET_ERROR,
 136         DCCP_RESET_CODE_OPTION_ERROR,
 137         DCCP_RESET_CODE_MANDATORY_ERROR,
 138         DCCP_RESET_CODE_CONNECTION_REFUSED,
 139         DCCP_RESET_CODE_BAD_SERVICE_CODE,
 140         DCCP_RESET_CODE_TOO_BUSY,
 141         DCCP_RESET_CODE_BAD_INIT_COOKIE,
 142         DCCP_RESET_CODE_AGGRESSION_PENALTY,
 143         __DCCP_RESET_CODE_LAST
 144 };
 145
 146 static const char tstr[] = "[|dccp]";
 147
 148 static const char *dccp_reset_codes[] = {
 149         "unspecified",
 150         "closed",
 151         "aborted",
 152         "no_connection",
 153         "packet_error",
 154         "option_error",
 155         "mandatory_error",
 156         "connection_refused",
 157         "bad_service_code",
 158         "too_busy",
 159         "bad_init_cookie",
 160         "aggression_penalty",
 161 };
 162
 163 static const char *dccp_feature_nums[] = {
 164         "reserved",
 165         "ccid",
 166         "allow_short_seqno",
 167         "sequence_window",
 168         "ecn_incapable",
 169         "ack_ratio",
 170         "send_ack_vector",
 171         "send_ndp_count",
 172         "minimum checksum coverage",
 173         "check data checksum",
 174 };
 175
 176 static inline u_int dccp_csum_coverage(const struct dccp_hdr* dh, u_int len)
 177 {
 178         u_int cov;
 179
 180         if (DCCPH_CSCOV(dh) == 0)
 181                 return len;
 182         cov = (dh->dccph_doff + DCCPH_CSCOV(dh) - 1) * sizeof(u_int32_t);
 183         return (cov > len)? len : cov;
 184 }
 185
 186 static int dccp_cksum(const struct ip *ip,
 187         const struct dccp_hdr *dh, u_int len)
 188 {
 189         return nextproto4_cksum(ip, (const u_int8_t *)(void *)dh, len,
 190                                 dccp_csum_coverage(dh, len), IPPROTO_DCCP);
 191 }
 192
 193 #ifdef INET6
 194 static int dccp6_cksum(const struct ip6_hdr *ip6, const struct dccp_hdr *dh, u_int len)
 195 {
 196         return nextproto6_cksum(ip6, (const u_int8_t *)(void *)dh, len,
 197                                 dccp_csum_coverage(dh, len), IPPROTO_DCCP);
 198 }
 199 #endif
 200
 201 static const char *dccp_reset_code(u_int8_t code)
 202 {
 203         if (code >= __DCCP_RESET_CODE_LAST)
 204                 return "invalid";
 205         return dccp_reset_codes[code];
 206 }
 207
 208 static u_int64_t dccp_seqno(const u_char *bp)
 209 {
 210         const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
 211         u_int64_t seqno;
 212
 213         if (DCCPH_X(dh) != 0) {
 214                 const struct dccp_hdr_ext *dhx = (const struct dccp_hdr_ext *)bp;
 215                 seqno = EXTRACT_48BITS(dhx->dccph_seq);
 216         } else {
 217                 seqno = EXTRACT_24BITS(dh->dccph_seq);
 218         }
 219
 220         return seqno;
 221 }
 222
 223 static inline unsigned int dccp_basic_hdr_len(const struct dccp_hdr *dh)
 224 {
 225         return DCCPH_X(dh) ? sizeof(struct dccp_hdr_ext) : sizeof(struct dccp_hdr);
 226 }
 227
 228 static void dccp_print_ack_no(netdissect_options *ndo, const u_char *bp)
 229 {
 230         const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
 231         const u_char *ackp = bp + dccp_basic_hdr_len(dh);
 232         u_int64_t ackno;
 233
 234         if (DCCPH_X(dh) != 0) {
 235                 ND_TCHECK2(*ackp, 8);
 236                 ackno = EXTRACT_48BITS(ackp + 2);
 237         } else {
 238                 ND_TCHECK2(*ackp, 4);
 239                 ackno = EXTRACT_24BITS(ackp + 1);
 240         }
 241
 242         ND_PRINT((ndo, "(ack=%" PRIu64 ") ", ackno));
 243 trunc:
 244         return;
 245 }
 246
 247 static int dccp_print_option(netdissect_options *, const u_char *, u_int);
 248
 249 /**
 250  * dccp_print - show dccp packet
 251  * @bp - beginning of dccp packet
 252  * @data2 - beginning of enclosing
 253  * @len - lenght of ip packet
 254  */
 255 void dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
 256                 u_int len)
 257 {
 258         const struct dccp_hdr *dh;
 259         const struct ip *ip;
 260 #ifdef INET6
 261         const struct ip6_hdr *ip6;
 262 #endif
 263         const u_char *cp;
 264         u_short sport, dport;
 265         u_int hlen;
 266         u_int fixed_hdrlen;
 267
 268         dh = (const struct dccp_hdr *)bp;
 269
 270         ip = (struct ip *)data2;
 271 #ifdef INET6
 272         if (IP_V(ip) == 6)
 273                 ip6 = (const struct ip6_hdr *)data2;
 274         else
 275                 ip6 = NULL;
 276 #endif /*INET6*/
 277
 278         /* make sure we have enough data to look at the X bit */
 279         cp = (const u_char *)(dh + 1);
 280         if (cp > ndo->ndo_snapend) {
 281                 ND_PRINT((ndo, "[Invalid packet|dccp]"));
 282                 return;
 283         }
 284         if (len < sizeof(struct dccp_hdr)) {
 285                 ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
 286                              len - (u_int)sizeof(struct dccp_hdr)));
 287                 return;
 288         }
 289
 290         /* get the length of the generic header */
 291         fixed_hdrlen = dccp_basic_hdr_len(dh);
 292         if (len < fixed_hdrlen) {
 293                 ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
 294                              len - fixed_hdrlen));
 295                 return;
 296         }
 297         ND_TCHECK2(*dh, fixed_hdrlen);
 298
 299         sport = EXTRACT_16BITS(&dh->dccph_sport);
 300         dport = EXTRACT_16BITS(&dh->dccph_dport);
 301         hlen = dh->dccph_doff * 4;
 302
 303 #ifdef INET6
 304         if (ip6) {
 305                 ND_PRINT((ndo, "%s.%d > %s.%d: ",
 306                              ip6addr_string(&ip6->ip6_src), sport,
 307                              ip6addr_string(&ip6->ip6_dst), dport));
 308         } else
 309 #endif /*INET6*/
 310         {
 311                 ND_PRINT((ndo, "%s.%d > %s.%d: ",
 312                              ipaddr_string(&ip->ip_src), sport,
 313                              ipaddr_string(&ip->ip_dst), dport));
 314         }
 315         fflush(stdout);
 316
 317         if (ndo->ndo_qflag) {
 318                 ND_PRINT((ndo, " %d", len - hlen));
 319                 if (hlen > len) {
 320                         ND_PRINT((ndo, "dccp [bad hdr length %u - too long, > %u]",
 321                             hlen, len));
 322                 }
 323                 return;
 324         }
 325
 326         /* other variables in generic header */
 327         if (ndo->ndo_vflag) {
 328                 ND_PRINT((ndo, "CCVal %d, CsCov %d, ", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh)));
 329         }
 330
 331         /* checksum calculation */
 332         if (ndo->ndo_vflag && ND_TTEST2(bp[0], len)) {
 333                 u_int16_t sum = 0, dccp_sum;
 334
 335                 dccp_sum = EXTRACT_16BITS(&dh->dccph_checksum);
 336                 ND_PRINT((ndo, "cksum 0x%04x ", dccp_sum));
 337                 if (IP_V(ip) == 4)
 338                         sum = dccp_cksum(ip, dh, len);
 339 #ifdef INET6
 340                 else if (IP_V(ip) == 6)
 341                         sum = dccp6_cksum(ip6, dh, len);
 342 #endif
 343                 if (sum != 0)
 344                         ND_PRINT((ndo, "(incorrect -> 0x%04x), ",in_cksum_shouldbe(dccp_sum, sum)));
 345                 else
 346                         ND_PRINT((ndo, "(correct), "));
 347         }
 348
 349         switch (DCCPH_TYPE(dh)) {
 350         case DCCP_PKT_REQUEST: {
 351                 struct dccp_hdr_request *dhr =
 352                         (struct dccp_hdr_request *)(bp + fixed_hdrlen);
 353                 fixed_hdrlen += 4;
 354                 if (len < fixed_hdrlen) {
 355                         ND_PRINT((ndo, "truncated-dccp request - %u bytes missing!",
 356                                      len - fixed_hdrlen));
 357                         return;
 358                 }
 359                 ND_TCHECK(*dhr);
 360                 ND_PRINT((ndo, "request (service=%d) ",
 361                              EXTRACT_32BITS(&dhr->dccph_req_service)));
 362                 break;
 363         }
 364         case DCCP_PKT_RESPONSE: {
 365                 struct dccp_hdr_response *dhr =
 366                         (struct dccp_hdr_response *)(bp + fixed_hdrlen);
 367                 fixed_hdrlen += 12;
 368                 if (len < fixed_hdrlen) {
 369                         ND_PRINT((ndo, "truncated-dccp response - %u bytes missing!",
 370                                      len - fixed_hdrlen));
 371                         return;
 372                 }
 373                 ND_TCHECK(*dhr);
 374                 ND_PRINT((ndo, "response (service=%d) ",
 375                              EXTRACT_32BITS(&dhr->dccph_resp_service)));
 376                 break;
 377         }
 378         case DCCP_PKT_DATA:
 379                 ND_PRINT((ndo, "data "));
 380                 break;
 381         case DCCP_PKT_ACK: {
 382                 fixed_hdrlen += 8;
 383                 if (len < fixed_hdrlen) {
 384                         ND_PRINT((ndo, "truncated-dccp ack - %u bytes missing!",
 385                                      len - fixed_hdrlen));
 386                         return;
 387                 }
 388                 ND_PRINT((ndo, "ack "));
 389                 break;
 390         }
 391         case DCCP_PKT_DATAACK: {
 392                 fixed_hdrlen += 8;
 393                 if (len < fixed_hdrlen) {
 394                         ND_PRINT((ndo, "truncated-dccp dataack - %u bytes missing!",
 395                                      len - fixed_hdrlen));
 396                         return;
 397                 }
 398                 ND_PRINT((ndo, "dataack "));
 399                 break;
 400         }
 401         case DCCP_PKT_CLOSEREQ:
 402                 fixed_hdrlen += 8;
 403                 if (len < fixed_hdrlen) {
 404                         ND_PRINT((ndo, "truncated-dccp closereq - %u bytes missing!",
 405                                      len - fixed_hdrlen));
 406                         return;
 407                 }
 408                 ND_PRINT((ndo, "closereq "));
 409                 break;
 410         case DCCP_PKT_CLOSE:
 411                 fixed_hdrlen += 8;
 412                 if (len < fixed_hdrlen) {
 413                         ND_PRINT((ndo, "truncated-dccp close - %u bytes missing!",
 414                                      len - fixed_hdrlen));
 415                         return;
 416                 }
 417                 ND_PRINT((ndo, "close "));
 418                 break;
 419         case DCCP_PKT_RESET: {
 420                 struct dccp_hdr_reset *dhr =
 421                         (struct dccp_hdr_reset *)(bp + fixed_hdrlen);
 422                 fixed_hdrlen += 12;
 423                 if (len < fixed_hdrlen) {
 424                         ND_PRINT((ndo, "truncated-dccp reset - %u bytes missing!",
 425                                      len - fixed_hdrlen));
 426                         return;
 427                 }
 428                 ND_TCHECK(*dhr);
 429                 ND_PRINT((ndo, "reset (code=%s) ",
 430                              dccp_reset_code(dhr->dccph_reset_code)));
 431                 break;
 432         }
 433         case DCCP_PKT_SYNC:
 434                 fixed_hdrlen += 8;
 435                 if (len < fixed_hdrlen) {
 436                         ND_PRINT((ndo, "truncated-dccp sync - %u bytes missing!",
 437                                      len - fixed_hdrlen));
 438                         return;
 439                 }
 440                 ND_PRINT((ndo, "sync "));
 441                 break;
 442         case DCCP_PKT_SYNCACK:
 443                 fixed_hdrlen += 8;
 444                 if (len < fixed_hdrlen) {
 445                         ND_PRINT((ndo, "truncated-dccp syncack - %u bytes missing!",
 446                                      len - fixed_hdrlen));
 447                         return;
 448                 }
 449                 ND_PRINT((ndo, "syncack "));
 450                 break;
 451         default:
 452                 ND_PRINT((ndo, "invalid "));
 453                 break;
 454         }
 455
 456         if ((DCCPH_TYPE(dh) != DCCP_PKT_DATA) &&
 457                         (DCCPH_TYPE(dh) != DCCP_PKT_REQUEST))
 458                 dccp_print_ack_no(ndo, bp);
 459
 460         if (ndo->ndo_vflag < 2)
 461                 return;
 462
 463         ND_PRINT((ndo, "seq %" PRIu64, dccp_seqno(bp)));
 464
 465         /* process options */
 466         if (hlen > fixed_hdrlen){
 467                 const u_char *cp;
 468                 u_int optlen;
 469                 cp = bp + fixed_hdrlen;
 470                 ND_PRINT((ndo, " <"));
 471
 472                 hlen -= fixed_hdrlen;
 473                 while(1){
 474                         optlen = dccp_print_option(ndo, cp, hlen);
 475                         if (!optlen)
 476                                 break;
 477                         if (hlen <= optlen)
 478                                 break;
 479                         hlen -= optlen;
 480                         cp += optlen;
 481                         ND_PRINT((ndo, ", "));
 482                 }
 483                 ND_PRINT((ndo, ">"));
 484         }
 485         return;
 486 trunc:
 487         ND_PRINT((ndo, "%s", tstr));
 488         return;
 489 }
 490
 491 static const struct tok dccp_option_values[] = {
 492         { 0, "nop" },
 493         { 1, "mandatory" },
 494         { 2, "slowreceiver" },
 495         { 32, "change_l" },
 496         { 33, "confirm_l" },
 497         { 34, "change_r" },
 498         { 35, "confirm_r" },
 499         { 36, "initcookie" },
 500         { 37, "ndp_count" },
 501         { 38, "ack_vector0" },
 502         { 39, "ack_vector1" },
 503         { 40, "data_dropped" },
 504         { 41, "timestamp" },
 505         { 42, "timestamp_echo" },
 506         { 43, "elapsed_time" },
 507         { 44, "data_checksum" },
 508         { 0, NULL }
 509 };
 510
 511 static int dccp_print_option(netdissect_options *ndo, const u_char *option, u_int hlen)
 512 {
 513         u_int8_t optlen, i;
 514
 515         ND_TCHECK(*option);
 516
 517         if (*option >= 32) {
 518                 ND_TCHECK(*(option+1));
 519                 optlen = *(option +1);
 520                 if (optlen < 2) {
 521                         if (*option >= 128)
 522                                 ND_PRINT((ndo, "CCID option %u optlen too short", *option));
 523                         else
 524                                 ND_PRINT((ndo, "%s optlen too short",
 525                                     tok2str(dccp_option_values, "Option %u", *option)));
 526                         return 0;
 527                 }
 528         } else
 529                 optlen = 1;
 530
 531         if (hlen < optlen) {
 532                 if (*option >= 128)
 533                         ND_PRINT((ndo, "CCID option %u optlen goes past header length",
 534                             *option));
 535                 else
 536                         ND_PRINT((ndo, "%s optlen goes past header length",
 537                             tok2str(dccp_option_values, "Option %u", *option)));
 538                 return 0;
 539         }
 540         ND_TCHECK2(*option, optlen);
 541
 542         if (*option >= 128) {
 543                 ND_PRINT((ndo, "CCID option %d", *option));
 544                 switch (optlen) {
 545                         case 4:
 546                                 ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2)));
 547                                 break;
 548                         case 6:
 549                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 550                                 break;
 551                         default:
 552                                 break;
 553                 }
 554         } else {
 555                 ND_PRINT((ndo, "%s", tok2str(dccp_option_values, "Option %u", *option)));
 556                 switch (*option) {
 557                 case 32:
 558                 case 33:
 559                 case 34:
 560                 case 35:
 561                         if (optlen < 3) {
 562                                 ND_PRINT((ndo, " optlen too short"));
 563                                 return optlen;
 564                         }
 565                         if (*(option + 2) < 10){
 566                                 ND_PRINT((ndo, " %s", dccp_feature_nums[*(option + 2)]));
 567                                 for (i = 0; i < optlen - 3; i++)
 568                                         ND_PRINT((ndo, " %d", *(option + 3 + i)));
 569                         }
 570                         break;
 571                 case 36:
 572                         if (optlen > 2) {
 573                                 ND_PRINT((ndo, " 0x"));
 574                                 for (i = 0; i < optlen - 2; i++)
 575                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 576                         }
 577                         break;
 578                 case 37:
 579                         for (i = 0; i < optlen - 2; i++)
 580                                 ND_PRINT((ndo, " %d", *(option + 2 + i)));
 581                         break;
 582                 case 38:
 583                         if (optlen > 2) {
 584                                 ND_PRINT((ndo, " 0x"));
 585                                 for (i = 0; i < optlen - 2; i++)
 586                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 587                         }
 588                         break;
 589                 case 39:
 590                         if (optlen > 2) {
 591                                 ND_PRINT((ndo, " 0x"));
 592                                 for (i = 0; i < optlen - 2; i++)
 593                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 594                         }
 595                         break;
 596                 case 40:
 597                         if (optlen > 2) {
 598                                 ND_PRINT((ndo, " 0x"));
 599                                 for (i = 0; i < optlen - 2; i++)
 600                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 601                         }
 602                         break;
 603                 case 41:
 604                         if (optlen == 4)
 605                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 606                         else
 607                                 ND_PRINT((ndo, " optlen != 4"));
 608                         break;
 609                 case 42:
 610                         if (optlen == 4)
 611                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 612                         else
 613                                 ND_PRINT((ndo, " optlen != 4"));
 614                         break;
 615                 case 43:
 616                         if (optlen == 6)
 617                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 618                         else if (optlen == 4)
 619                                 ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2)));
 620                         else
 621                                 ND_PRINT((ndo, " optlen != 4 or 6"));
 622                         break;
 623                 case 44:
 624                         if (optlen > 2) {
 625                                 ND_PRINT((ndo, " "));
 626                                 for (i = 0; i < optlen - 2; i++)
 627                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 628                         }
 629                         break;
 630                 }
 631         }
 632
 633         return optlen;
 634 trunc:
 635         ND_PRINT((ndo, "%s", tstr));
 636         return 0;
 637 }