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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 u64 dccp_decode_value_var(const u8 *bf, const u8 len)
  33 {
  34         u64 value = 0;
  35
  36         if (len >= DCCP_OPTVAL_MAXLEN)
  37                 value += ((u64)*bf++) << 40;
  38         if (len > 4)
  39                 value += ((u64)*bf++) << 32;
  40         if (len > 3)
  41                 value += ((u64)*bf++) << 24;
  42         if (len > 2)
  43                 value += ((u64)*bf++) << 16;
  44         if (len > 1)
  45                 value += ((u64)*bf++) << 8;
  46         if (len > 0)
  47                 value += *bf;
  48
  49         return value;
  50 }
  51
  52 /**
  53  * dccp_parse_options  -  Parse DCCP options present in @skb
  54  * @sk: client|server|listening dccp socket (when @dreq != NULL)
  55  * @dreq: request socket to use during connection setup, or NULL
  56  */
  57 int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
  58                        struct sk_buff *skb)
  59 {
  60         struct dccp_sock *dp = dccp_sk(sk);
  61         const struct dccp_hdr *dh = dccp_hdr(skb);
  62         const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type;
  63         u64 ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq;
  64         unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb);
  65         unsigned char *opt_ptr = options;
  66         const unsigned char *opt_end = (unsigned char *)dh +
  67                                         (dh->dccph_doff * 4);
  68         struct dccp_options_received *opt_recv = &dp->dccps_options_received;
  69         unsigned char opt, len;
  70         unsigned char *value;
  71         u32 elapsed_time;
  72         __be32 opt_val;
  73         int rc;
  74         int mandatory = 0;
  75
  76         memset(opt_recv, 0, sizeof(*opt_recv));
  77
  78         opt = len = 0;
  79         while (opt_ptr != opt_end) {
  80                 opt   = *opt_ptr++;
  81                 len   = 0;
  82                 value = NULL;
  83
  84                 /* Check if this isn't a single byte option */
  85                 if (opt > DCCPO_MAX_RESERVED) {
  86                         if (opt_ptr == opt_end)
  87                                 goto out_nonsensical_length;
  88
  89                         len = *opt_ptr++;
  90                         if (len < 2)
  91                                 goto out_nonsensical_length;
  92                         /*
  93                          * Remove the type and len fields, leaving
  94                          * just the value size
  95                          */
  96                         len     -= 2;
  97                         value   = opt_ptr;
  98                         opt_ptr += len;
  99
 100                         if (opt_ptr > opt_end)
 101                                 goto out_nonsensical_length;
 102                 }
 103
 104                 /*
 105                  * CCID-Specific Options (from RFC 4340, sec. 10.3):
 106                  *
 107                  * Option numbers 128 through 191 are for options sent from the
 108                  * HC-Sender to the HC-Receiver; option numbers 192 through 255
 109                  * are for options sent from the HC-Receiver to the HC-Sender.
 110                  *
 111                  * CCID-specific options are ignored during connection setup, as
 112                  * negotiation may still be in progress (see RFC 4340, 10.3).
 113                  * The same applies to Ack Vectors, as these depend on the CCID.
 114                  *
 115                  */
 116                 if (dreq != NULL && (opt >= 128 ||
 117                     opt == DCCPO_ACK_VECTOR_0 || opt == DCCPO_ACK_VECTOR_1))
 118                         goto ignore_option;
 119
 120                 switch (opt) {
 121                 case DCCPO_PADDING:
 122                         break;
 123                 case DCCPO_MANDATORY:
 124                         if (mandatory)
 125                                 goto out_invalid_option;
 126                         if (pkt_type != DCCP_PKT_DATA)
 127                                 mandatory = 1;
 128                         break;
 129                 case DCCPO_NDP_COUNT:
 130                         if (len > 6)
 131                                 goto out_invalid_option;
 132
 133                         opt_recv->dccpor_ndp = dccp_decode_value_var(value, len);
 134                         dccp_pr_debug("%s opt: NDP count=%llu\n", dccp_role(sk),
 135                                       (unsigned long long)opt_recv->dccpor_ndp);
 136                         break;
 137                 case DCCPO_CHANGE_L:
 138                 case DCCPO_CHANGE_R:
 139                         if (pkt_type == DCCP_PKT_DATA)
 140                                 break;
 141                         rc = dccp_feat_parse_options(sk, dreq, mandatory, opt,
 142                                                     *value, value + 1, len - 1);
 143                         if (rc)
 144                                 goto out_featneg_failed;
 145                         break;
 146                 case DCCPO_CONFIRM_L:
 147                         /* fall through */
 148                 case DCCPO_CONFIRM_R:
 149                         if (pkt_type == DCCP_PKT_DATA)
 150                                 break;
 151                         if (len < 2)    /* FIXME this disallows empty confirm */
 152                                 goto out_invalid_option;
 153                         if (dccp_feat_confirm_recv(sk, opt, *value,
 154                                                    value + 1, len - 1))
 155                                 goto out_invalid_option;
 156                         break;
 157                 case DCCPO_ACK_VECTOR_0:
 158                 case DCCPO_ACK_VECTOR_1:
 159                         if (dccp_packet_without_ack(skb))   /* RFC 4340, 11.4 */
 160                                 break;
 161
 162                         if (dccp_msk(sk)->dccpms_send_ack_vector &&
 163                             dccp_ackvec_parse(sk, skb, &ackno, opt, value, len))
 164                                 goto out_invalid_option;
 165                         break;
 166                 case DCCPO_TIMESTAMP:
 167                         if (len != 4)
 168                                 goto out_invalid_option;
 169                         /*
 170                          * RFC 4340 13.1: "The precise time corresponding to
 171                          * Timestamp Value zero is not specified". We use
 172                          * zero to indicate absence of a meaningful timestamp.
 173                          */
 174                         opt_val = get_unaligned((__be32 *)value);
 175                         if (unlikely(opt_val == 0)) {
 176                                 DCCP_WARN("Timestamp with zero value\n");
 177                                 break;
 178                         }
 179
 180                         if (dreq != NULL) {
 181                                 dreq->dreq_timestamp_echo = ntohl(opt_val);
 182                                 dreq->dreq_timestamp_time = dccp_timestamp();
 183                         } else {
 184                                 opt_recv->dccpor_timestamp =
 185                                         dp->dccps_timestamp_echo = ntohl(opt_val);
 186                                 dp->dccps_timestamp_time = dccp_timestamp();
 187                         }
 188                         dccp_pr_debug("%s rx opt: TIMESTAMP=%u, ackno=%llu\n",
 189                                       dccp_role(sk), ntohl(opt_val),
 190                                       (unsigned long long)
 191                                       DCCP_SKB_CB(skb)->dccpd_ack_seq);
 192                         break;
 193                 case DCCPO_TIMESTAMP_ECHO:
 194                         if (len != 4 && len != 6 && len != 8)
 195                                 goto out_invalid_option;
 196
 197                         opt_val = get_unaligned((__be32 *)value);
 198                         opt_recv->dccpor_timestamp_echo = ntohl(opt_val);
 199
 200                         dccp_pr_debug("%s rx opt: TIMESTAMP_ECHO=%u, len=%d, "
 201                                       "ackno=%llu", dccp_role(sk),
 202                                       opt_recv->dccpor_timestamp_echo,
 203                                       len + 2,
 204                                       (unsigned long long)
 205                                       DCCP_SKB_CB(skb)->dccpd_ack_seq);
 206
 207                         value += 4;
 208
 209                         if (len == 4) {         /* no elapsed time included */
 210                                 dccp_pr_debug_cat("\n");
 211                                 break;
 212                         }
 213
 214                         if (len == 6) {         /* 2-byte elapsed time */
 215                                 __be16 opt_val2 = get_unaligned((__be16 *)value);
 216                                 elapsed_time = ntohs(opt_val2);
 217                         } else {                /* 4-byte elapsed time */
 218                                 opt_val = get_unaligned((__be32 *)value);
 219                                 elapsed_time = ntohl(opt_val);
 220                         }
 221
 222                         dccp_pr_debug_cat(", ELAPSED_TIME=%u\n", elapsed_time);
 223
 224                         /* Give precedence to the biggest ELAPSED_TIME */
 225                         if (elapsed_time > opt_recv->dccpor_elapsed_time)
 226                                 opt_recv->dccpor_elapsed_time = elapsed_time;
 227                         break;
 228                 case DCCPO_ELAPSED_TIME:
 229                         if (dccp_packet_without_ack(skb))   /* RFC 4340, 13.2 */
 230                                 break;
 231
 232                         if (len == 2) {
 233                                 __be16 opt_val2 = get_unaligned((__be16 *)value);
 234                                 elapsed_time = ntohs(opt_val2);
 235                         } else if (len == 4) {
 236                                 opt_val = get_unaligned((__be32 *)value);
 237                                 elapsed_time = ntohl(opt_val);
 238                         } else {
 239                                 goto out_invalid_option;
 240                         }
 241
 242                         if (elapsed_time > opt_recv->dccpor_elapsed_time)
 243                                 opt_recv->dccpor_elapsed_time = elapsed_time;
 244
 245                         dccp_pr_debug("%s rx opt: ELAPSED_TIME=%d\n",
 246                                       dccp_role(sk), elapsed_time);
 247                         break;
 248                 case 128 ... 191: {
 249                         const u16 idx = value - options;
 250
 251                         if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk,
 252                                                      opt, len, idx,
 253                                                      value) != 0)
 254                                 goto out_invalid_option;
 255                 }
 256                         break;
 257                 case 192 ... 255: {
 258                         const u16 idx = value - options;
 259
 260                         if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk,
 261                                                      opt, len, idx,
 262                                                      value) != 0)
 263                                 goto out_invalid_option;
 264                 }
 265                         break;
 266                 default:
 267                         DCCP_CRIT("DCCP(%p): option %d(len=%d) not "
 268                                   "implemented, ignoring", sk, opt, len);
 269                         break;
 270                 }
 271 ignore_option:
 272                 if (opt != DCCPO_MANDATORY)
 273                         mandatory = 0;
 274         }
 275
 276         /* mandatory was the last byte in option list -> reset connection */
 277         if (mandatory)
 278                 goto out_invalid_option;
 279
 280 out_nonsensical_length:
 281         /* RFC 4340, 5.8: ignore option and all remaining option space */
 282         return 0;
 283
 284 out_invalid_option:
 285         DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT);
 286         rc = DCCP_RESET_CODE_OPTION_ERROR;
 287 out_featneg_failed:
 288         DCCP_WARN("DCCP(%p): Option %d (len=%d) error=%u\n", sk, opt, len, rc);
 289         DCCP_SKB_CB(skb)->dccpd_reset_code = rc;
 290         DCCP_SKB_CB(skb)->dccpd_reset_data[0] = opt;
 291         DCCP_SKB_CB(skb)->dccpd_reset_data[1] = len > 0 ? value[0] : 0;
 292         DCCP_SKB_CB(skb)->dccpd_reset_data[2] = len > 1 ? value[1] : 0;
 293         return -1;
 294 }
 295
 296 EXPORT_SYMBOL_GPL(dccp_parse_options);
 297
 298 void dccp_encode_value_var(const u64 value, u8 *to, const u8 len)
 299 {
 300         if (len >= DCCP_OPTVAL_MAXLEN)
 301                 *to++ = (value & 0xFF0000000000ull) >> 40;
 302         if (len > 4)
 303                 *to++ = (value & 0xFF00000000ull) >> 32;
 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 /**
 464  * dccp_insert_option_mandatory  -  Mandatory option (5.8.2)
 465  * Note that since we are using skb_push, this function needs to be called
 466  * _after_ inserting the option it is supposed to influence (stack order).
 467  */
 468 int dccp_insert_option_mandatory(struct sk_buff *skb)
 469 {
 470         if (DCCP_SKB_CB(skb)->dccpd_opt_len >= DCCP_MAX_OPT_LEN)
 471                 return -1;
 472
 473         DCCP_SKB_CB(skb)->dccpd_opt_len++;
 474         *skb_push(skb, 1) = DCCPO_MANDATORY;
 475         return 0;
 476 }
 477
 478 /**
 479  * dccp_insert_fn_opt  -  Insert single Feature-Negotiation option into @skb
 480  * @type: %DCCPO_CHANGE_L, %DCCPO_CHANGE_R, %DCCPO_CONFIRM_L, %DCCPO_CONFIRM_R
 481  * @feat: one out of %dccp_feature_numbers
 482  * @val: NN value or SP array (preferred element first) to copy
 483  * @len: true length of @val in bytes (excluding first element repetition)
 484  * @repeat_first: whether to copy the first element of @val twice
 485  * The last argument is used to construct Confirm options, where the preferred
 486  * value and the preference list appear separately (RFC 4340, 6.3.1). Preference
 487  * lists are kept such that the preferred entry is always first, so we only need
 488  * to copy twice, and avoid the overhead of cloning into a bigger array.
 489  */
 490 int dccp_insert_fn_opt(struct sk_buff *skb, u8 type, u8 feat,
 491                        u8 *val, u8 len, bool repeat_first)
 492 {
 493         u8 tot_len, *to;
 494
 495         /* take the `Feature' field and possible repetition into account */
 496         if (len > (DCCP_SINGLE_OPT_MAXLEN - 2)) {
 497                 DCCP_WARN("length %u for feature %u too large\n", len, feat);
 498                 return -1;
 499         }
 500
 501         if (unlikely(val == NULL || len == 0))
 502                 len = repeat_first = 0;
 503         tot_len = 3 + repeat_first + len;
 504
 505         if (DCCP_SKB_CB(skb)->dccpd_opt_len + tot_len > DCCP_MAX_OPT_LEN) {
 506                 DCCP_WARN("packet too small for feature %d option!\n", feat);
 507                 return -1;
 508         }
 509         DCCP_SKB_CB(skb)->dccpd_opt_len += tot_len;
 510
 511         to    = skb_push(skb, tot_len);
 512         *to++ = type;
 513         *to++ = tot_len;
 514         *to++ = feat;
 515
 516         if (repeat_first)
 517                 *to++ = *val;
 518         if (len)
 519                 memcpy(to, val, len);
 520
 521         dccp_pr_debug("%s(%s (%d), ...), length %d\n",
 522                       dccp_feat_typename(type),
 523                       dccp_feat_name(feat), feat, len);
 524         return 0;
 525 }
 526
 527 /* The length of all options needs to be a multiple of 4 (5.8) */
 528 static void dccp_insert_option_padding(struct sk_buff *skb)
 529 {
 530         int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4;
 531
 532         if (padding != 0) {
 533                 padding = 4 - padding;
 534                 memset(skb_push(skb, padding), 0, padding);
 535                 DCCP_SKB_CB(skb)->dccpd_opt_len += padding;
 536         }
 537 }
 538
 539 int dccp_insert_options(struct sock *sk, struct sk_buff *skb)
 540 {
 541         struct dccp_sock *dp = dccp_sk(sk);
 542         struct dccp_minisock *dmsk = dccp_msk(sk);
 543
 544         DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
 545
 546         if (dmsk->dccpms_send_ndp_count &&
 547             dccp_insert_option_ndp(sk, skb))
 548                 return -1;
 549
 550         if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA) {
 551
 552                 /* Feature Negotiation */
 553                 if (dccp_feat_insert_opts(dp, NULL, skb))
 554                         return -1;
 555
 556                 if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST) {
 557                         /*
 558                          * Obtain RTT sample from Request/Response exchange.
 559                          * This is currently used in CCID 3 initialisation.
 560                          */
 561                         if (dccp_insert_option_timestamp(sk, skb))
 562                                 return -1;
 563
 564                 } else if (dmsk->dccpms_send_ack_vector &&
 565                            dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) &&
 566                            dccp_insert_option_ackvec(sk, skb)) {
 567                                 return -1;
 568                 }
 569         }
 570
 571         if (dp->dccps_hc_rx_insert_options) {
 572                 if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb))
 573                         return -1;
 574                 dp->dccps_hc_rx_insert_options = 0;
 575         }
 576
 577         if (dp->dccps_timestamp_echo != 0 &&
 578             dccp_insert_option_timestamp_echo(dp, NULL, skb))
 579                 return -1;
 580
 581         dccp_insert_option_padding(skb);
 582         return 0;
 583 }
 584
 585 int dccp_insert_options_rsk(struct dccp_request_sock *dreq, struct sk_buff *skb)
 586 {
 587         DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
 588
 589         if (dccp_feat_insert_opts(NULL, dreq, skb))
 590                 return -1;
 591
 592         if (dreq->dreq_timestamp_echo != 0 &&
 593             dccp_insert_option_timestamp_echo(NULL, dreq, skb))
 594                 return -1;
 595
 596         dccp_insert_option_padding(skb);
 597         return 0;
 598 }