net/dccp/options.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  net/dccp/options.c
   4  *
   5  *  An implementation of the DCCP protocol
   6  *  Copyright (c) 2005 Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
   7  *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
   8  *  Copyright (c) 2005 Ian McDonald <ian.mcdonald@jandi.co.nz>
   9  */
  10 #include <linux/dccp.h>
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <asm/unaligned.h>
  14 #include <linux/kernel.h>
  15 #include <linux/skbuff.h>
  16
  17 #include "ackvec.h"
  18 #include "ccid.h"
  19 #include "dccp.h"
  20 #include "feat.h"
  21
  22 u64 dccp_decode_value_var(const u8 *bf, const u8 len)
  23 {
  24         u64 value = 0;
  25
  26         if (len >= DCCP_OPTVAL_MAXLEN)
  27                 value += ((u64)*bf++) << 40;
  28         if (len > 4)
  29                 value += ((u64)*bf++) << 32;
  30         if (len > 3)
  31                 value += ((u64)*bf++) << 24;
  32         if (len > 2)
  33                 value += ((u64)*bf++) << 16;
  34         if (len > 1)
  35                 value += ((u64)*bf++) << 8;
  36         if (len > 0)
  37                 value += *bf;
  38
  39         return value;
  40 }
  41
  42 /**
  43  * dccp_parse_options  -  Parse DCCP options present in @skb
  44  * @sk: client|server|listening dccp socket (when @dreq != NULL)
  45  * @dreq: request socket to use during connection setup, or NULL
  46  * @skb: frame to parse
  47  */
  48 int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
  49                        struct sk_buff *skb)
  50 {
  51         struct dccp_sock *dp = dccp_sk(sk);
  52         const struct dccp_hdr *dh = dccp_hdr(skb);
  53         const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type;
  54         unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb);
  55         unsigned char *opt_ptr = options;
  56         const unsigned char *opt_end = (unsigned char *)dh +
  57                                         (dh->dccph_doff * 4);
  58         struct dccp_options_received *opt_recv = &dp->dccps_options_received;
  59         unsigned char opt, len;
  60         unsigned char *value;
  61         u32 elapsed_time;
  62         __be32 opt_val;
  63         int rc;
  64         int mandatory = 0;
  65
  66         memset(opt_recv, 0, sizeof(*opt_recv));
  67
  68         opt = len = 0;
  69         while (opt_ptr != opt_end) {
  70                 opt   = *opt_ptr++;
  71                 len   = 0;
  72                 value = NULL;
  73
  74                 /* Check if this isn't a single byte option */
  75                 if (opt > DCCPO_MAX_RESERVED) {
  76                         if (opt_ptr == opt_end)
  77                                 goto out_nonsensical_length;
  78
  79                         len = *opt_ptr++;
  80                         if (len < 2)
  81                                 goto out_nonsensical_length;
  82                         /*
  83                          * Remove the type and len fields, leaving
  84                          * just the value size
  85                          */
  86                         len     -= 2;
  87                         value   = opt_ptr;
  88                         opt_ptr += len;
  89
  90                         if (opt_ptr > opt_end)
  91                                 goto out_nonsensical_length;
  92                 }
  93
  94                 /*
  95                  * CCID-specific options are ignored during connection setup, as
  96                  * negotiation may still be in progress (see RFC 4340, 10.3).
  97                  * The same applies to Ack Vectors, as these depend on the CCID.
  98                  */
  99                 if (dreq != NULL && (opt >= DCCPO_MIN_RX_CCID_SPECIFIC ||
 100                     opt == DCCPO_ACK_VECTOR_0 || opt == DCCPO_ACK_VECTOR_1))
 101                         goto ignore_option;
 102
 103                 switch (opt) {
 104                 case DCCPO_PADDING:
 105                         break;
 106                 case DCCPO_MANDATORY:
 107                         if (mandatory)
 108                                 goto out_invalid_option;
 109                         if (pkt_type != DCCP_PKT_DATA)
 110                                 mandatory = 1;
 111                         break;
 112                 case DCCPO_NDP_COUNT:
 113                         if (len > 6)
 114                                 goto out_invalid_option;
 115
 116                         opt_recv->dccpor_ndp = dccp_decode_value_var(value, len);
 117                         dccp_pr_debug("%s opt: NDP count=%llu\n", dccp_role(sk),
 118                                       (unsigned long long)opt_recv->dccpor_ndp);
 119                         break;
 120                 case DCCPO_CHANGE_L ... DCCPO_CONFIRM_R:
 121                         if (pkt_type == DCCP_PKT_DATA)      /* RFC 4340, 6 */
 122                                 break;
 123                         if (len == 0)
 124                                 goto out_invalid_option;
 125                         rc = dccp_feat_parse_options(sk, dreq, mandatory, opt,
 126                                                     *value, value + 1, len - 1);
 127                         if (rc)
 128                                 goto out_featneg_failed;
 129                         break;
 130                 case DCCPO_TIMESTAMP:
 131                         if (len != 4)
 132                                 goto out_invalid_option;
 133                         /*
 134                          * RFC 4340 13.1: "The precise time corresponding to
 135                          * Timestamp Value zero is not specified". We use
 136                          * zero to indicate absence of a meaningful timestamp.
 137                          */
 138                         opt_val = get_unaligned((__be32 *)value);
 139                         if (unlikely(opt_val == 0)) {
 140                                 DCCP_WARN("Timestamp with zero value\n");
 141                                 break;
 142                         }
 143
 144                         if (dreq != NULL) {
 145                                 dreq->dreq_timestamp_echo = ntohl(opt_val);
 146                                 dreq->dreq_timestamp_time = dccp_timestamp();
 147                         } else {
 148                                 opt_recv->dccpor_timestamp =
 149                                         dp->dccps_timestamp_echo = ntohl(opt_val);
 150                                 dp->dccps_timestamp_time = dccp_timestamp();
 151                         }
 152                         dccp_pr_debug("%s rx opt: TIMESTAMP=%u, ackno=%llu\n",
 153                                       dccp_role(sk), ntohl(opt_val),
 154                                       (unsigned long long)
 155                                       DCCP_SKB_CB(skb)->dccpd_ack_seq);
 156                         /* schedule an Ack in case this sender is quiescent */
 157                         inet_csk_schedule_ack(sk);
 158                         break;
 159                 case DCCPO_TIMESTAMP_ECHO:
 160                         if (len != 4 && len != 6 && len != 8)
 161                                 goto out_invalid_option;
 162
 163                         opt_val = get_unaligned((__be32 *)value);
 164                         opt_recv->dccpor_timestamp_echo = ntohl(opt_val);
 165
 166                         dccp_pr_debug("%s rx opt: TIMESTAMP_ECHO=%u, len=%d, "
 167                                       "ackno=%llu", dccp_role(sk),
 168                                       opt_recv->dccpor_timestamp_echo,
 169                                       len + 2,
 170                                       (unsigned long long)
 171                                       DCCP_SKB_CB(skb)->dccpd_ack_seq);
 172
 173                         value += 4;
 174
 175                         if (len == 4) {         /* no elapsed time included */
 176                                 dccp_pr_debug_cat("\n");
 177                                 break;
 178                         }
 179
 180                         if (len == 6) {         /* 2-byte elapsed time */
 181                                 __be16 opt_val2 = get_unaligned((__be16 *)value);
 182                                 elapsed_time = ntohs(opt_val2);
 183                         } else {                /* 4-byte elapsed time */
 184                                 opt_val = get_unaligned((__be32 *)value);
 185                                 elapsed_time = ntohl(opt_val);
 186                         }
 187
 188                         dccp_pr_debug_cat(", ELAPSED_TIME=%u\n", elapsed_time);
 189
 190                         /* Give precedence to the biggest ELAPSED_TIME */
 191                         if (elapsed_time > opt_recv->dccpor_elapsed_time)
 192                                 opt_recv->dccpor_elapsed_time = elapsed_time;
 193                         break;
 194                 case DCCPO_ELAPSED_TIME:
 195                         if (dccp_packet_without_ack(skb))   /* RFC 4340, 13.2 */
 196                                 break;
 197
 198                         if (len == 2) {
 199                                 __be16 opt_val2 = get_unaligned((__be16 *)value);
 200                                 elapsed_time = ntohs(opt_val2);
 201                         } else if (len == 4) {
 202                                 opt_val = get_unaligned((__be32 *)value);
 203                                 elapsed_time = ntohl(opt_val);
 204                         } else {
 205                                 goto out_invalid_option;
 206                         }
 207
 208                         if (elapsed_time > opt_recv->dccpor_elapsed_time)
 209                                 opt_recv->dccpor_elapsed_time = elapsed_time;
 210
 211                         dccp_pr_debug("%s rx opt: ELAPSED_TIME=%d\n",
 212                                       dccp_role(sk), elapsed_time);
 213                         break;
 214                 case DCCPO_MIN_RX_CCID_SPECIFIC ... DCCPO_MAX_RX_CCID_SPECIFIC:
 215                         if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk,
 216                                                      pkt_type, opt, value, len))
 217                                 goto out_invalid_option;
 218                         break;
 219                 case DCCPO_ACK_VECTOR_0:
 220                 case DCCPO_ACK_VECTOR_1:
 221                         if (dccp_packet_without_ack(skb))   /* RFC 4340, 11.4 */
 222                                 break;
 223                         /*
 224                          * Ack vectors are processed by the TX CCID if it is
 225                          * interested. The RX CCID need not parse Ack Vectors,
 226                          * since it is only interested in clearing old state.
 227                          */
 228                         /* fall through */
 229                 case DCCPO_MIN_TX_CCID_SPECIFIC ... DCCPO_MAX_TX_CCID_SPECIFIC:
 230                         if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk,
 231                                                      pkt_type, opt, value, len))
 232                                 goto out_invalid_option;
 233                         break;
 234                 default:
 235                         DCCP_CRIT("DCCP(%p): option %d(len=%d) not "
 236                                   "implemented, ignoring", sk, opt, len);
 237                         break;
 238                 }
 239 ignore_option:
 240                 if (opt != DCCPO_MANDATORY)
 241                         mandatory = 0;
 242         }
 243
 244         /* mandatory was the last byte in option list -> reset connection */
 245         if (mandatory)
 246                 goto out_invalid_option;
 247
 248 out_nonsensical_length:
 249         /* RFC 4340, 5.8: ignore option and all remaining option space */
 250         return 0;
 251
 252 out_invalid_option:
 253         DCCP_INC_STATS(DCCP_MIB_INVALIDOPT);
 254         rc = DCCP_RESET_CODE_OPTION_ERROR;
 255 out_featneg_failed:
 256         DCCP_WARN("DCCP(%p): Option %d (len=%d) error=%u\n", sk, opt, len, rc);
 257         DCCP_SKB_CB(skb)->dccpd_reset_code = rc;
 258         DCCP_SKB_CB(skb)->dccpd_reset_data[0] = opt;
 259         DCCP_SKB_CB(skb)->dccpd_reset_data[1] = len > 0 ? value[0] : 0;
 260         DCCP_SKB_CB(skb)->dccpd_reset_data[2] = len > 1 ? value[1] : 0;
 261         return -1;
 262 }
 263
 264 EXPORT_SYMBOL_GPL(dccp_parse_options);
 265
 266 void dccp_encode_value_var(const u64 value, u8 *to, const u8 len)
 267 {
 268         if (len >= DCCP_OPTVAL_MAXLEN)
 269                 *to++ = (value & 0xFF0000000000ull) >> 40;
 270         if (len > 4)
 271                 *to++ = (value & 0xFF00000000ull) >> 32;
 272         if (len > 3)
 273                 *to++ = (value & 0xFF000000) >> 24;
 274         if (len > 2)
 275                 *to++ = (value & 0xFF0000) >> 16;
 276         if (len > 1)
 277                 *to++ = (value & 0xFF00) >> 8;
 278         if (len > 0)
 279                 *to++ = (value & 0xFF);
 280 }
 281
 282 static inline u8 dccp_ndp_len(const u64 ndp)
 283 {
 284         if (likely(ndp <= 0xFF))
 285                 return 1;
 286         return likely(ndp <= USHRT_MAX) ? 2 : (ndp <= UINT_MAX ? 4 : 6);
 287 }
 288
 289 int dccp_insert_option(struct sk_buff *skb, const unsigned char option,
 290                        const void *value, const unsigned char len)
 291 {
 292         unsigned char *to;
 293
 294         if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN)
 295                 return -1;
 296
 297         DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2;
 298
 299         to    = skb_push(skb, len + 2);
 300         *to++ = option;
 301         *to++ = len + 2;
 302
 303         memcpy(to, value, len);
 304         return 0;
 305 }
 306
 307 EXPORT_SYMBOL_GPL(dccp_insert_option);
 308
 309 static int dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb)
 310 {
 311         struct dccp_sock *dp = dccp_sk(sk);
 312         u64 ndp = dp->dccps_ndp_count;
 313
 314         if (dccp_non_data_packet(skb))
 315                 ++dp->dccps_ndp_count;
 316         else
 317                 dp->dccps_ndp_count = 0;
 318
 319         if (ndp > 0) {
 320                 unsigned char *ptr;
 321                 const int ndp_len = dccp_ndp_len(ndp);
 322                 const int len = ndp_len + 2;
 323
 324                 if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
 325                         return -1;
 326
 327                 DCCP_SKB_CB(skb)->dccpd_opt_len += len;
 328
 329                 ptr = skb_push(skb, len);
 330                 *ptr++ = DCCPO_NDP_COUNT;
 331                 *ptr++ = len;
 332                 dccp_encode_value_var(ndp, ptr, ndp_len);
 333         }
 334
 335         return 0;
 336 }
 337
 338 static inline int dccp_elapsed_time_len(const u32 elapsed_time)
 339 {
 340         return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4;
 341 }
 342
 343 static int dccp_insert_option_timestamp(struct sk_buff *skb)
 344 {
 345         __be32 now = htonl(dccp_timestamp());
 346         /* yes this will overflow but that is the point as we want a
 347          * 10 usec 32 bit timer which mean it wraps every 11.9 hours */
 348
 349         return dccp_insert_option(skb, DCCPO_TIMESTAMP, &now, sizeof(now));
 350 }
 351
 352 static int dccp_insert_option_timestamp_echo(struct dccp_sock *dp,
 353                                              struct dccp_request_sock *dreq,
 354                                              struct sk_buff *skb)
 355 {
 356         __be32 tstamp_echo;
 357         unsigned char *to;
 358         u32 elapsed_time, elapsed_time_len, len;
 359
 360         if (dreq != NULL) {
 361                 elapsed_time = dccp_timestamp() - dreq->dreq_timestamp_time;
 362                 tstamp_echo  = htonl(dreq->dreq_timestamp_echo);
 363                 dreq->dreq_timestamp_echo = 0;
 364         } else {
 365                 elapsed_time = dccp_timestamp() - dp->dccps_timestamp_time;
 366                 tstamp_echo  = htonl(dp->dccps_timestamp_echo);
 367                 dp->dccps_timestamp_echo = 0;
 368         }
 369
 370         elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
 371         len = 6 + elapsed_time_len;
 372
 373         if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
 374                 return -1;
 375
 376         DCCP_SKB_CB(skb)->dccpd_opt_len += len;
 377
 378         to    = skb_push(skb, len);
 379         *to++ = DCCPO_TIMESTAMP_ECHO;
 380         *to++ = len;
 381
 382         memcpy(to, &tstamp_echo, 4);
 383         to += 4;
 384
 385         if (elapsed_time_len == 2) {
 386                 const __be16 var16 = htons((u16)elapsed_time);
 387                 memcpy(to, &var16, 2);
 388         } else if (elapsed_time_len == 4) {
 389                 const __be32 var32 = htonl(elapsed_time);
 390                 memcpy(to, &var32, 4);
 391         }
 392
 393         return 0;
 394 }
 395
 396 static int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
 397 {
 398         struct dccp_sock *dp = dccp_sk(sk);
 399         struct dccp_ackvec *av = dp->dccps_hc_rx_ackvec;
 400         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
 401         const u16 buflen = dccp_ackvec_buflen(av);
 402         /* Figure out how many options do we need to represent the ackvec */
 403         const u8 nr_opts = DIV_ROUND_UP(buflen, DCCP_SINGLE_OPT_MAXLEN);
 404         u16 len = buflen + 2 * nr_opts;
 405         u8 i, nonce = 0;
 406         const unsigned char *tail, *from;
 407         unsigned char *to;
 408
 409         if (dcb->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) {
 410                 DCCP_WARN("Lacking space for %u bytes on %s packet\n", len,
 411                           dccp_packet_name(dcb->dccpd_type));
 412                 return -1;
 413         }
 414         /*
 415          * Since Ack Vectors are variable-length, we can not always predict
 416          * their size. To catch exception cases where the space is running out
 417          * on the skb, a separate Sync is scheduled to carry the Ack Vector.
 418          */
 419         if (len > DCCPAV_MIN_OPTLEN &&
 420             len + dcb->dccpd_opt_len + skb->len > dp->dccps_mss_cache) {
 421                 DCCP_WARN("No space left for Ack Vector (%u) on skb (%u+%u), "
 422                           "MPS=%u ==> reduce payload size?\n", len, skb->len,
 423                           dcb->dccpd_opt_len, dp->dccps_mss_cache);
 424                 dp->dccps_sync_scheduled = 1;
 425                 return 0;
 426         }
 427         dcb->dccpd_opt_len += len;
 428
 429         to   = skb_push(skb, len);
 430         len  = buflen;
 431         from = av->av_buf + av->av_buf_head;
 432         tail = av->av_buf + DCCPAV_MAX_ACKVEC_LEN;
 433
 434         for (i = 0; i < nr_opts; ++i) {
 435                 int copylen = len;
 436
 437                 if (len > DCCP_SINGLE_OPT_MAXLEN)
 438                         copylen = DCCP_SINGLE_OPT_MAXLEN;
 439
 440                 /*
 441                  * RFC 4340, 12.2: Encode the Nonce Echo for this Ack Vector via
 442                  * its type; ack_nonce is the sum of all individual buf_nonce's.
 443                  */
 444                 nonce ^= av->av_buf_nonce[i];
 445
 446                 *to++ = DCCPO_ACK_VECTOR_0 + av->av_buf_nonce[i];
 447                 *to++ = copylen + 2;
 448
 449                 /* Check if buf_head wraps */
 450                 if (from + copylen > tail) {
 451                         const u16 tailsize = tail - from;
 452
 453                         memcpy(to, from, tailsize);
 454                         to      += tailsize;
 455                         len     -= tailsize;
 456                         copylen -= tailsize;
 457                         from    = av->av_buf;
 458                 }
 459
 460                 memcpy(to, from, copylen);
 461                 from += copylen;
 462                 to   += copylen;
 463                 len  -= copylen;
 464         }
 465         /*
 466          * Each sent Ack Vector is recorded in the list, as per A.2 of RFC 4340.
 467          */
 468         if (dccp_ackvec_update_records(av, dcb->dccpd_seq, nonce))
 469                 return -ENOBUFS;
 470         return 0;
 471 }
 472
 473 /**
 474  * dccp_insert_option_mandatory  -  Mandatory option (5.8.2)
 475  * @skb: frame into which to insert option
 476  *
 477  * Note that since we are using skb_push, this function needs to be called
 478  * _after_ inserting the option it is supposed to influence (stack order).
 479  */
 480 int dccp_insert_option_mandatory(struct sk_buff *skb)
 481 {
 482         if (DCCP_SKB_CB(skb)->dccpd_opt_len >= DCCP_MAX_OPT_LEN)
 483                 return -1;
 484
 485         DCCP_SKB_CB(skb)->dccpd_opt_len++;
 486         *(u8 *)skb_push(skb, 1) = DCCPO_MANDATORY;
 487         return 0;
 488 }
 489
 490 /**
 491  * dccp_insert_fn_opt  -  Insert single Feature-Negotiation option into @skb
 492  * @skb: frame to insert feature negotiation option into
 493  * @type: %DCCPO_CHANGE_L, %DCCPO_CHANGE_R, %DCCPO_CONFIRM_L, %DCCPO_CONFIRM_R
 494  * @feat: one out of %dccp_feature_numbers
 495  * @val: NN value or SP array (preferred element first) to copy
 496  * @len: true length of @val in bytes (excluding first element repetition)
 497  * @repeat_first: whether to copy the first element of @val twice
 498  *
 499  * The last argument is used to construct Confirm options, where the preferred
 500  * value and the preference list appear separately (RFC 4340, 6.3.1). Preference
 501  * lists are kept such that the preferred entry is always first, so we only need
 502  * to copy twice, and avoid the overhead of cloning into a bigger array.
 503  */
 504 int dccp_insert_fn_opt(struct sk_buff *skb, u8 type, u8 feat,
 505                        u8 *val, u8 len, bool repeat_first)
 506 {
 507         u8 tot_len, *to;
 508
 509         /* take the `Feature' field and possible repetition into account */
 510         if (len > (DCCP_SINGLE_OPT_MAXLEN - 2)) {
 511                 DCCP_WARN("length %u for feature %u too large\n", len, feat);
 512                 return -1;
 513         }
 514
 515         if (unlikely(val == NULL || len == 0))
 516                 len = repeat_first = false;
 517         tot_len = 3 + repeat_first + len;
 518
 519         if (DCCP_SKB_CB(skb)->dccpd_opt_len + tot_len > DCCP_MAX_OPT_LEN) {
 520                 DCCP_WARN("packet too small for feature %d option!\n", feat);
 521                 return -1;
 522         }
 523         DCCP_SKB_CB(skb)->dccpd_opt_len += tot_len;
 524
 525         to    = skb_push(skb, tot_len);
 526         *to++ = type;
 527         *to++ = tot_len;
 528         *to++ = feat;
 529
 530         if (repeat_first)
 531                 *to++ = *val;
 532         if (len)
 533                 memcpy(to, val, len);
 534         return 0;
 535 }
 536
 537 /* The length of all options needs to be a multiple of 4 (5.8) */
 538 static void dccp_insert_option_padding(struct sk_buff *skb)
 539 {
 540         int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4;
 541
 542         if (padding != 0) {
 543                 padding = 4 - padding;
 544                 memset(skb_push(skb, padding), 0, padding);
 545                 DCCP_SKB_CB(skb)->dccpd_opt_len += padding;
 546         }
 547 }
 548
 549 int dccp_insert_options(struct sock *sk, struct sk_buff *skb)
 550 {
 551         struct dccp_sock *dp = dccp_sk(sk);
 552
 553         DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
 554
 555         if (dp->dccps_send_ndp_count && dccp_insert_option_ndp(sk, skb))
 556                 return -1;
 557
 558         if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA) {
 559
 560                 /* Feature Negotiation */
 561                 if (dccp_feat_insert_opts(dp, NULL, skb))
 562                         return -1;
 563
 564                 if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST) {
 565                         /*
 566                          * Obtain RTT sample from Request/Response exchange.
 567                          * This is currently used for TFRC initialisation.
 568                          */
 569                         if (dccp_insert_option_timestamp(skb))
 570                                 return -1;
 571
 572                 } else if (dccp_ackvec_pending(sk) &&
 573                            dccp_insert_option_ackvec(sk, skb)) {
 574                                 return -1;
 575                 }
 576         }
 577
 578         if (dp->dccps_hc_rx_insert_options) {
 579                 if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb))
 580                         return -1;
 581                 dp->dccps_hc_rx_insert_options = 0;
 582         }
 583
 584         if (dp->dccps_timestamp_echo != 0 &&
 585             dccp_insert_option_timestamp_echo(dp, NULL, skb))
 586                 return -1;
 587
 588         dccp_insert_option_padding(skb);
 589         return 0;
 590 }
 591
 592 int dccp_insert_options_rsk(struct dccp_request_sock *dreq, struct sk_buff *skb)
 593 {
 594         DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
 595
 596         if (dccp_feat_insert_opts(NULL, dreq, skb))
 597                 return -1;
 598
 599         /* Obtain RTT sample from Response/Ack exchange (used by TFRC). */
 600         if (dccp_insert_option_timestamp(skb))
 601                 return -1;
 602
 603         if (dreq->dreq_timestamp_echo != 0 &&
 604             dccp_insert_option_timestamp_echo(NULL, dreq, skb))
 605                 return -1;
 606
 607         dccp_insert_option_padding(skb);
 608         return 0;
 609 }