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   1 /*
   2  *  net/dccp/options.c
   3  *
   4  *  An implementation of the DCCP protocol
   5  *  Copyright (c) 2005 Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
   6  *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
   7  *  Copyright (c) 2005 Ian McDonald <ian.mcdonald@jandi.co.nz>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14 #include <linux/dccp.h>
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17 #include <asm/unaligned.h>
  18 #include <linux/kernel.h>
  19 #include <linux/skbuff.h>
  20
  21 #include "ackvec.h"
  22 #include "ccid.h"
  23 #include "dccp.h"
  24 #include "feat.h"
  25
  26 int sysctl_dccp_feat_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW;
  27 int sysctl_dccp_feat_rx_ccid          = DCCPF_INITIAL_CCID;
  28 int sysctl_dccp_feat_tx_ccid          = DCCPF_INITIAL_CCID;
  29 int sysctl_dccp_feat_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR;
  30 int sysctl_dccp_feat_send_ndp_count  = DCCPF_INITIAL_SEND_NDP_COUNT;
  31
  32 static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len)
  33 {
  34         u32 value = 0;
  35
  36         if (len > 3)
  37                 value += *bf++ << 24;
  38         if (len > 2)
  39                 value += *bf++ << 16;
  40         if (len > 1)
  41                 value += *bf++ << 8;
  42         if (len > 0)
  43                 value += *bf;
  44
  45         return value;
  46 }
  47
  48 /**
  49  * dccp_parse_options  -  Parse DCCP options present in @skb
  50  * @sk: client|server|listening dccp socket (when @dreq != NULL)
  51  * @dreq: request socket to use during connection setup, or NULL
  52  */
  53 int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
  54                        struct sk_buff *skb)
  55 {
  56         struct dccp_sock *dp = dccp_sk(sk);
  57         const struct dccp_hdr *dh = dccp_hdr(skb);
  58         const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type;
  59         u64 ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq;
  60         unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb);
  61         unsigned char *opt_ptr = options;
  62         const unsigned char *opt_end = (unsigned char *)dh +
  63                                         (dh->dccph_doff * 4);
  64         struct dccp_options_received *opt_recv = &dp->dccps_options_received;
  65         unsigned char opt, len;
  66         unsigned char *value;
  67         u32 elapsed_time;
  68         __be32 opt_val;
  69         int rc;
  70         int mandatory = 0;
  71
  72         memset(opt_recv, 0, sizeof(*opt_recv));
  73
  74         opt = len = 0;
  75         while (opt_ptr != opt_end) {
  76                 opt   = *opt_ptr++;
  77                 len   = 0;
  78                 value = NULL;
  79
  80                 /* Check if this isn't a single byte option */
  81                 if (opt > DCCPO_MAX_RESERVED) {
  82                         if (opt_ptr == opt_end)
  83                                 goto out_nonsensical_length;
  84
  85                         len = *opt_ptr++;
  86                         if (len < 2)
  87                                 goto out_nonsensical_length;
  88                         /*
  89                          * Remove the type and len fields, leaving
  90                          * just the value size
  91                          */
  92                         len     -= 2;
  93                         value   = opt_ptr;
  94                         opt_ptr += len;
  95
  96                         if (opt_ptr > opt_end)
  97                                 goto out_nonsensical_length;
  98                 }
  99
 100                 /*
 101                  * CCID-Specific Options (from RFC 4340, sec. 10.3):
 102                  *
 103                  * Option numbers 128 through 191 are for options sent from the
 104                  * HC-Sender to the HC-Receiver; option numbers 192 through 255
 105                  * are for options sent from the HC-Receiver to the HC-Sender.
 106                  *
 107                  * CCID-specific options are ignored during connection setup, as
 108                  * negotiation may still be in progress (see RFC 4340, 10.3).
 109                  * The same applies to Ack Vectors, as these depend on the CCID.
 110                  *
 111                  */
 112                 if (dreq != NULL && (opt >= 128 ||
 113                     opt == DCCPO_ACK_VECTOR_0 || opt == DCCPO_ACK_VECTOR_1))
 114                         goto ignore_option;
 115
 116                 switch (opt) {
 117                 case DCCPO_PADDING:
 118                         break;
 119                 case DCCPO_MANDATORY:
 120                         if (mandatory)
 121                                 goto out_invalid_option;
 122                         if (pkt_type != DCCP_PKT_DATA)
 123                                 mandatory = 1;
 124                         break;
 125                 case DCCPO_NDP_COUNT:
 126                         if (len > 6)
 127                                 goto out_invalid_option;
 128
 129                         opt_recv->dccpor_ndp = dccp_decode_value_var(value, len);
 130                         dccp_pr_debug("%s opt: NDP count=%llu\n", dccp_role(sk),
 131                                       (unsigned long long)opt_recv->dccpor_ndp);
 132                         break;
 133                 case DCCPO_CHANGE_L:
 134                         /* fall through */
 135                 case DCCPO_CHANGE_R:
 136                         if (pkt_type == DCCP_PKT_DATA)
 137                                 break;
 138                         if (len < 2)
 139                                 goto out_invalid_option;
 140                         rc = dccp_feat_change_recv(sk, opt, *value, value + 1,
 141                                                    len - 1);
 142                         /*
 143                          * When there is a change error, change_recv is
 144                          * responsible for dealing with it.  i.e. reply with an
 145                          * empty confirm.
 146                          * If the change was mandatory, then we need to die.
 147                          */
 148                         if (rc && mandatory)
 149                                 goto out_invalid_option;
 150                         break;
 151                 case DCCPO_CONFIRM_L:
 152                         /* fall through */
 153                 case DCCPO_CONFIRM_R:
 154                         if (pkt_type == DCCP_PKT_DATA)
 155                                 break;
 156                         if (len < 2)    /* FIXME this disallows empty confirm */
 157                                 goto out_invalid_option;
 158                         if (dccp_feat_confirm_recv(sk, opt, *value,
 159                                                    value + 1, len - 1))
 160                                 goto out_invalid_option;
 161                         break;
 162                 case DCCPO_ACK_VECTOR_0:
 163                 case DCCPO_ACK_VECTOR_1:
 164                         if (dccp_packet_without_ack(skb))   /* RFC 4340, 11.4 */
 165                                 break;
 166
 167                         if (dccp_msk(sk)->dccpms_send_ack_vector &&
 168                             dccp_ackvec_parse(sk, skb, &ackno, opt, value, len))
 169                                 goto out_invalid_option;
 170                         break;
 171                 case DCCPO_TIMESTAMP:
 172                         if (len != 4)
 173                                 goto out_invalid_option;
 174                         /*
 175                          * RFC 4340 13.1: "The precise time corresponding to
 176                          * Timestamp Value zero is not specified". We use
 177                          * zero to indicate absence of a meaningful timestamp.
 178                          */
 179                         opt_val = get_unaligned((__be32 *)value);
 180                         if (unlikely(opt_val == 0)) {
 181                                 DCCP_WARN("Timestamp with zero value\n");
 182                                 break;
 183                         }
 184
 185                         if (dreq != NULL) {
 186                                 dreq->dreq_timestamp_echo = ntohl(opt_val);
 187                                 dreq->dreq_timestamp_time = dccp_timestamp();
 188                         } else {
 189                                 opt_recv->dccpor_timestamp =
 190                                         dp->dccps_timestamp_echo = ntohl(opt_val);
 191                                 dp->dccps_timestamp_time = dccp_timestamp();
 192                         }
 193                         dccp_pr_debug("%s rx opt: TIMESTAMP=%u, ackno=%llu\n",
 194                                       dccp_role(sk), ntohl(opt_val),
 195                                       (unsigned long long)
 196                                       DCCP_SKB_CB(skb)->dccpd_ack_seq);
 197                         break;
 198                 case DCCPO_TIMESTAMP_ECHO:
 199                         if (len != 4 && len != 6 && len != 8)
 200                                 goto out_invalid_option;
 201
 202                         opt_val = get_unaligned((__be32 *)value);
 203                         opt_recv->dccpor_timestamp_echo = ntohl(opt_val);
 204
 205                         dccp_pr_debug("%s rx opt: TIMESTAMP_ECHO=%u, len=%d, "
 206                                       "ackno=%llu", dccp_role(sk),
 207                                       opt_recv->dccpor_timestamp_echo,
 208                                       len + 2,
 209                                       (unsigned long long)
 210                                       DCCP_SKB_CB(skb)->dccpd_ack_seq);
 211
 212                         value += 4;
 213
 214                         if (len == 4) {         /* no elapsed time included */
 215                                 dccp_pr_debug_cat("\n");
 216                                 break;
 217                         }
 218
 219                         if (len == 6) {         /* 2-byte elapsed time */
 220                                 __be16 opt_val2 = get_unaligned((__be16 *)value);
 221                                 elapsed_time = ntohs(opt_val2);
 222                         } else {                /* 4-byte elapsed time */
 223                                 opt_val = get_unaligned((__be32 *)value);
 224                                 elapsed_time = ntohl(opt_val);
 225                         }
 226
 227                         dccp_pr_debug_cat(", ELAPSED_TIME=%u\n", elapsed_time);
 228
 229                         /* Give precedence to the biggest ELAPSED_TIME */
 230                         if (elapsed_time > opt_recv->dccpor_elapsed_time)
 231                                 opt_recv->dccpor_elapsed_time = elapsed_time;
 232                         break;
 233                 case DCCPO_ELAPSED_TIME:
 234                         if (dccp_packet_without_ack(skb))   /* RFC 4340, 13.2 */
 235                                 break;
 236
 237                         if (len == 2) {
 238                                 __be16 opt_val2 = get_unaligned((__be16 *)value);
 239                                 elapsed_time = ntohs(opt_val2);
 240                         } else if (len == 4) {
 241                                 opt_val = get_unaligned((__be32 *)value);
 242                                 elapsed_time = ntohl(opt_val);
 243                         } else {
 244                                 goto out_invalid_option;
 245                         }
 246
 247                         if (elapsed_time > opt_recv->dccpor_elapsed_time)
 248                                 opt_recv->dccpor_elapsed_time = elapsed_time;
 249
 250                         dccp_pr_debug("%s rx opt: ELAPSED_TIME=%d\n",
 251                                       dccp_role(sk), elapsed_time);
 252                         break;
 253                 case 128 ... 191: {
 254                         const u16 idx = value - options;
 255
 256                         if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk,
 257                                                      opt, len, idx,
 258                                                      value) != 0)
 259                                 goto out_invalid_option;
 260                 }
 261                         break;
 262                 case 192 ... 255: {
 263                         const u16 idx = value - options;
 264
 265                         if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk,
 266                                                      opt, len, idx,
 267                                                      value) != 0)
 268                                 goto out_invalid_option;
 269                 }
 270                         break;
 271                 default:
 272                         DCCP_CRIT("DCCP(%p): option %d(len=%d) not "
 273                                   "implemented, ignoring", sk, opt, len);
 274                         break;
 275                 }
 276 ignore_option:
 277                 if (opt != DCCPO_MANDATORY)
 278                         mandatory = 0;
 279         }
 280
 281         /* mandatory was the last byte in option list -> reset connection */
 282         if (mandatory)
 283                 goto out_invalid_option;
 284
 285 out_nonsensical_length:
 286         /* RFC 4340, 5.8: ignore option and all remaining option space */
 287         return 0;
 288
 289 out_invalid_option:
 290         DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT);
 291         DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR;
 292         DCCP_WARN("DCCP(%p): invalid option %d, len=%d", sk, opt, len);
 293         DCCP_SKB_CB(skb)->dccpd_reset_data[0] = opt;
 294         DCCP_SKB_CB(skb)->dccpd_reset_data[1] = len > 0 ? value[0] : 0;
 295         DCCP_SKB_CB(skb)->dccpd_reset_data[2] = len > 1 ? value[1] : 0;
 296         return -1;
 297 }
 298
 299 EXPORT_SYMBOL_GPL(dccp_parse_options);
 300
 301 static void dccp_encode_value_var(const u32 value, unsigned char *to,
 302                                   const unsigned int len)
 303 {
 304         if (len > 3)
 305                 *to++ = (value & 0xFF000000) >> 24;
 306         if (len > 2)
 307                 *to++ = (value & 0xFF0000) >> 16;
 308         if (len > 1)
 309                 *to++ = (value & 0xFF00) >> 8;
 310         if (len > 0)
 311                 *to++ = (value & 0xFF);
 312 }
 313
 314 static inline u8 dccp_ndp_len(const u64 ndp)
 315 {
 316         if (likely(ndp <= 0xFF))
 317                 return 1;
 318         return likely(ndp <= USHORT_MAX) ? 2 : (ndp <= UINT_MAX ? 4 : 6);
 319 }
 320
 321 int dccp_insert_option(struct sock *sk, struct sk_buff *skb,
 322                         const unsigned char option,
 323                         const void *value, const unsigned char len)
 324 {
 325         unsigned char *to;
 326
 327         if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN)
 328                 return -1;
 329
 330         DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2;
 331
 332         to    = skb_push(skb, len + 2);
 333         *to++ = option;
 334         *to++ = len + 2;
 335
 336         memcpy(to, value, len);
 337         return 0;
 338 }
 339
 340 EXPORT_SYMBOL_GPL(dccp_insert_option);
 341
 342 static int dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb)
 343 {
 344         struct dccp_sock *dp = dccp_sk(sk);
 345         u64 ndp = dp->dccps_ndp_count;
 346
 347         if (dccp_non_data_packet(skb))
 348                 ++dp->dccps_ndp_count;
 349         else
 350                 dp->dccps_ndp_count = 0;
 351
 352         if (ndp > 0) {
 353                 unsigned char *ptr;
 354                 const int ndp_len = dccp_ndp_len(ndp);
 355                 const int len = ndp_len + 2;
 356
 357                 if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
 358                         return -1;
 359
 360                 DCCP_SKB_CB(skb)->dccpd_opt_len += len;
 361
 362                 ptr = skb_push(skb, len);
 363                 *ptr++ = DCCPO_NDP_COUNT;
 364                 *ptr++ = len;
 365                 dccp_encode_value_var(ndp, ptr, ndp_len);
 366         }
 367
 368         return 0;
 369 }
 370
 371 static inline int dccp_elapsed_time_len(const u32 elapsed_time)
 372 {
 373         return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4;
 374 }
 375
 376 int dccp_insert_option_elapsed_time(struct sock *sk, struct sk_buff *skb,
 377                                     u32 elapsed_time)
 378 {
 379         const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
 380         const int len = 2 + elapsed_time_len;
 381         unsigned char *to;
 382
 383         if (elapsed_time_len == 0)
 384                 return 0;
 385
 386         if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
 387                 return -1;
 388
 389         DCCP_SKB_CB(skb)->dccpd_opt_len += len;
 390
 391         to    = skb_push(skb, len);
 392         *to++ = DCCPO_ELAPSED_TIME;
 393         *to++ = len;
 394
 395         if (elapsed_time_len == 2) {
 396                 const __be16 var16 = htons((u16)elapsed_time);
 397                 memcpy(to, &var16, 2);
 398         } else {
 399                 const __be32 var32 = htonl(elapsed_time);
 400                 memcpy(to, &var32, 4);
 401         }
 402
 403         return 0;
 404 }
 405
 406 EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time);
 407
 408 int dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb)
 409 {
 410         __be32 now = htonl(dccp_timestamp());
 411         /* yes this will overflow but that is the point as we want a
 412          * 10 usec 32 bit timer which mean it wraps every 11.9 hours */
 413
 414         return dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now));
 415 }
 416
 417 EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp);
 418
 419 static int dccp_insert_option_timestamp_echo(struct dccp_sock *dp,
 420                                              struct dccp_request_sock *dreq,
 421                                              struct sk_buff *skb)
 422 {
 423         __be32 tstamp_echo;
 424         unsigned char *to;
 425         u32 elapsed_time, elapsed_time_len, len;
 426
 427         if (dreq != NULL) {
 428                 elapsed_time = dccp_timestamp() - dreq->dreq_timestamp_time;
 429                 tstamp_echo  = htonl(dreq->dreq_timestamp_echo);
 430                 dreq->dreq_timestamp_echo = 0;
 431         } else {
 432                 elapsed_time = dccp_timestamp() - dp->dccps_timestamp_time;
 433                 tstamp_echo  = htonl(dp->dccps_timestamp_echo);
 434                 dp->dccps_timestamp_echo = 0;
 435         }
 436
 437         elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
 438         len = 6 + elapsed_time_len;
 439
 440         if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
 441                 return -1;
 442
 443         DCCP_SKB_CB(skb)->dccpd_opt_len += len;
 444
 445         to    = skb_push(skb, len);
 446         *to++ = DCCPO_TIMESTAMP_ECHO;
 447         *to++ = len;
 448
 449         memcpy(to, &tstamp_echo, 4);
 450         to += 4;
 451
 452         if (elapsed_time_len == 2) {
 453                 const __be16 var16 = htons((u16)elapsed_time);
 454                 memcpy(to, &var16, 2);
 455         } else if (elapsed_time_len == 4) {
 456                 const __be32 var32 = htonl(elapsed_time);
 457                 memcpy(to, &var32, 4);
 458         }
 459
 460         return 0;
 461 }
 462
 463 static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat,
 464                                 u8 *val, u8 len)
 465 {
 466         u8 *to;
 467
 468         if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) {
 469                 DCCP_WARN("packet too small for feature %d option!\n", feat);
 470                 return -1;
 471         }
 472
 473         DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3;
 474
 475         to    = skb_push(skb, len + 3);
 476         *to++ = type;
 477         *to++ = len + 3;
 478         *to++ = feat;
 479
 480         if (len)
 481                 memcpy(to, val, len);
 482
 483         dccp_pr_debug("%s(%s (%d), ...), length %d\n",
 484                       dccp_feat_typename(type),
 485                       dccp_feat_name(feat), feat, len);
 486         return 0;
 487 }
 488
 489 static int dccp_insert_options_feat(struct sock *sk, struct sk_buff *skb)
 490 {
 491         struct dccp_minisock *dmsk = dccp_msk(sk);
 492         struct dccp_opt_pend *opt, *next;
 493         int change = 0;
 494
 495         /* confirm any options [NN opts] */
 496         list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) {
 497                 dccp_insert_feat_opt(skb, opt->dccpop_type,
 498                                      opt->dccpop_feat, opt->dccpop_val,
 499                                      opt->dccpop_len);
 500                 /* fear empty confirms */
 501                 if (opt->dccpop_val)
 502                         kfree(opt->dccpop_val);
 503                 kfree(opt);
 504         }
 505         INIT_LIST_HEAD(&dmsk->dccpms_conf);
 506
 507         /* see which features we need to send */
 508         list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
 509                 /* see if we need to send any confirm */
 510                 if (opt->dccpop_sc) {
 511                         dccp_insert_feat_opt(skb, opt->dccpop_type + 1,
 512                                              opt->dccpop_feat,
 513                                              opt->dccpop_sc->dccpoc_val,
 514                                              opt->dccpop_sc->dccpoc_len);
 515
 516                         BUG_ON(!opt->dccpop_sc->dccpoc_val);
 517                         kfree(opt->dccpop_sc->dccpoc_val);
 518                         kfree(opt->dccpop_sc);
 519                         opt->dccpop_sc = NULL;
 520                 }
 521
 522                 /* any option not confirmed, re-send it */
 523                 if (!opt->dccpop_conf) {
 524                         dccp_insert_feat_opt(skb, opt->dccpop_type,
 525                                              opt->dccpop_feat, opt->dccpop_val,
 526                                              opt->dccpop_len);
 527                         change++;
 528                 }
 529         }
 530
 531         return 0;
 532 }
 533
 534 /* The length of all options needs to be a multiple of 4 (5.8) */
 535 static void dccp_insert_option_padding(struct sk_buff *skb)
 536 {
 537         int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4;
 538
 539         if (padding != 0) {
 540                 padding = 4 - padding;
 541                 memset(skb_push(skb, padding), 0, padding);
 542                 DCCP_SKB_CB(skb)->dccpd_opt_len += padding;
 543         }
 544 }
 545
 546 int dccp_insert_options(struct sock *sk, struct sk_buff *skb)
 547 {
 548         struct dccp_sock *dp = dccp_sk(sk);
 549         struct dccp_minisock *dmsk = dccp_msk(sk);
 550
 551         DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
 552
 553         if (dmsk->dccpms_send_ndp_count &&
 554             dccp_insert_option_ndp(sk, skb))
 555                 return -1;
 556
 557         if (!dccp_packet_without_ack(skb)) {
 558                 if (dmsk->dccpms_send_ack_vector &&
 559                     dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) &&
 560                     dccp_insert_option_ackvec(sk, skb))
 561                         return -1;
 562         }
 563
 564         if (dp->dccps_hc_rx_insert_options) {
 565                 if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb))
 566                         return -1;
 567                 dp->dccps_hc_rx_insert_options = 0;
 568         }
 569
 570         /* Feature negotiation */
 571         /* Data packets can't do feat negotiation */
 572         if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA &&
 573             DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATAACK &&
 574             dccp_insert_options_feat(sk, skb))
 575                 return -1;
 576
 577         /*
 578          * Obtain RTT sample from Request/Response exchange.
 579          * This is currently used in CCID 3 initialisation.
 580          */
 581         if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST &&
 582             dccp_insert_option_timestamp(sk, skb))
 583                 return -1;
 584
 585         if (dp->dccps_timestamp_echo != 0 &&
 586             dccp_insert_option_timestamp_echo(dp, NULL, skb))
 587                 return -1;
 588
 589         dccp_insert_option_padding(skb);
 590         return 0;
 591 }
 592
 593 int dccp_insert_options_rsk(struct dccp_request_sock *dreq, struct sk_buff *skb)
 594 {
 595         DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
 596
 597         if (dreq->dreq_timestamp_echo != 0 &&
 598             dccp_insert_option_timestamp_echo(NULL, dreq, skb))
 599                 return -1;
 600
 601         dccp_insert_option_padding(skb);
 602         return 0;
 603 }