1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * Definitions for the TCP protocol. 8 * 9 * Version: @(#)tcp.h 1.0.2 04/28/93 10 * 11 * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 12 */ 13 #ifndef _LINUX_TCP_H 14 #define _LINUX_TCP_H 15 16 17 #include <linux/skbuff.h> 18 #include <linux/win_minmax.h> 19 #include <net/sock.h> 20 #include <net/inet_connection_sock.h> 21 #include <net/inet_timewait_sock.h> 22 #include <uapi/linux/tcp.h> 23 24 static inline struct tcphdr *tcp_hdr(const struct sk_buff *skb) 25 { 26 return (struct tcphdr *)skb_transport_header(skb); 27 } 28 29 static inline unsigned int __tcp_hdrlen(const struct tcphdr *th) 30 { 31 return th->doff * 4; 32 } 33 34 static inline unsigned int tcp_hdrlen(const struct sk_buff *skb) 35 { 36 return __tcp_hdrlen(tcp_hdr(skb)); 37 } 38 39 static inline struct tcphdr *inner_tcp_hdr(const struct sk_buff *skb) 40 { 41 return (struct tcphdr *)skb_inner_transport_header(skb); 42 } 43 44 static inline unsigned int inner_tcp_hdrlen(const struct sk_buff *skb) 45 { 46 return inner_tcp_hdr(skb)->doff * 4; 47 } 48 49 /** 50 * skb_tcp_all_headers - Returns size of all headers for a TCP packet 51 * @skb: buffer 52 * 53 * Used in TX path, for a packet known to be a TCP one. 54 * 55 * if (skb_is_gso(skb)) { 56 * int hlen = skb_tcp_all_headers(skb); 57 * ... 58 */ 59 static inline int skb_tcp_all_headers(const struct sk_buff *skb) 60 { 61 return skb_transport_offset(skb) + tcp_hdrlen(skb); 62 } 63 64 /** 65 * skb_inner_tcp_all_headers - Returns size of all headers for an encap TCP packet 66 * @skb: buffer 67 * 68 * Used in TX path, for a packet known to be a TCP one. 69 * 70 * if (skb_is_gso(skb) && skb->encapsulation) { 71 * int hlen = skb_inner_tcp_all_headers(skb); 72 * ... 73 */ 74 static inline int skb_inner_tcp_all_headers(const struct sk_buff *skb) 75 { 76 return skb_inner_transport_offset(skb) + inner_tcp_hdrlen(skb); 77 } 78 79 static inline unsigned int tcp_optlen(const struct sk_buff *skb) 80 { 81 return (tcp_hdr(skb)->doff - 5) * 4; 82 } 83 84 /* TCP Fast Open */ 85 #define TCP_FASTOPEN_COOKIE_MIN 4 /* Min Fast Open Cookie size in bytes */ 86 #define TCP_FASTOPEN_COOKIE_MAX 16 /* Max Fast Open Cookie size in bytes */ 87 #define TCP_FASTOPEN_COOKIE_SIZE 8 /* the size employed by this impl. */ 88 89 /* TCP Fast Open Cookie as stored in memory */ 90 struct tcp_fastopen_cookie { 91 __le64 val[DIV_ROUND_UP(TCP_FASTOPEN_COOKIE_MAX, sizeof(u64))]; 92 s8 len; 93 bool exp; /* In RFC6994 experimental option format */ 94 }; 95 96 /* This defines a selective acknowledgement block. */ 97 struct tcp_sack_block_wire { 98 __be32 start_seq; 99 __be32 end_seq; 100 }; 101 102 struct tcp_sack_block { 103 u32 start_seq; 104 u32 end_seq; 105 }; 106 107 /*These are used to set the sack_ok field in struct tcp_options_received */ 108 #define TCP_SACK_SEEN (1 << 0) /*1 = peer is SACK capable, */ 109 #define TCP_DSACK_SEEN (1 << 2) /*1 = DSACK was received from peer*/ 110 111 struct tcp_options_received { 112 /* PAWS/RTTM data */ 113 int ts_recent_stamp;/* Time we stored ts_recent (for aging) */ 114 u32 ts_recent; /* Time stamp to echo next */ 115 u32 rcv_tsval; /* Time stamp value */ 116 u32 rcv_tsecr; /* Time stamp echo reply */ 117 u16 saw_tstamp : 1, /* Saw TIMESTAMP on last packet */ 118 tstamp_ok : 1, /* TIMESTAMP seen on SYN packet */ 119 dsack : 1, /* D-SACK is scheduled */ 120 wscale_ok : 1, /* Wscale seen on SYN packet */ 121 sack_ok : 3, /* SACK seen on SYN packet */ 122 smc_ok : 1, /* SMC seen on SYN packet */ 123 snd_wscale : 4, /* Window scaling received from sender */ 124 rcv_wscale : 4; /* Window scaling to send to receiver */ 125 u8 saw_unknown:1, /* Received unknown option */ 126 unused:7; 127 u8 num_sacks; /* Number of SACK blocks */ 128 u16 user_mss; /* mss requested by user in ioctl */ 129 u16 mss_clamp; /* Maximal mss, negotiated at connection setup */ 130 }; 131 132 static inline void tcp_clear_options(struct tcp_options_received *rx_opt) 133 { 134 rx_opt->tstamp_ok = rx_opt->sack_ok = 0; 135 rx_opt->wscale_ok = rx_opt->snd_wscale = 0; 136 #if IS_ENABLED(CONFIG_SMC) 137 rx_opt->smc_ok = 0; 138 #endif 139 } 140 141 /* This is the max number of SACKS that we'll generate and process. It's safe 142 * to increase this, although since: 143 * size = TCPOLEN_SACK_BASE_ALIGNED (4) + n * TCPOLEN_SACK_PERBLOCK (8) 144 * only four options will fit in a standard TCP header */ 145 #define TCP_NUM_SACKS 4 146 147 struct tcp_request_sock_ops; 148 149 struct tcp_request_sock { 150 struct inet_request_sock req; 151 const struct tcp_request_sock_ops *af_specific; 152 u64 snt_synack; /* first SYNACK sent time */ 153 bool tfo_listener; 154 bool is_mptcp; 155 #if IS_ENABLED(CONFIG_MPTCP) 156 bool drop_req; 157 #endif 158 u32 txhash; 159 u32 rcv_isn; 160 u32 snt_isn; 161 u32 ts_off; 162 u32 last_oow_ack_time; /* last SYNACK */ 163 u32 rcv_nxt; /* the ack # by SYNACK. For 164 * FastOpen it's the seq# 165 * after data-in-SYN. 166 */ 167 u8 syn_tos; 168 }; 169 170 static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req) 171 { 172 return (struct tcp_request_sock *)req; 173 } 174 175 struct tcp_sock { 176 /* inet_connection_sock has to be the first member of tcp_sock */ 177 struct inet_connection_sock inet_conn; 178 u16 tcp_header_len; /* Bytes of tcp header to send */ 179 u16 gso_segs; /* Max number of segs per GSO packet */ 180 181 /* 182 * Header prediction flags 183 * 0x5?10 << 16 + snd_wnd in net byte order 184 */ 185 __be32 pred_flags; 186 187 /* 188 * RFC793 variables by their proper names. This means you can 189 * read the code and the spec side by side (and laugh ...) 190 * See RFC793 and RFC1122. The RFC writes these in capitals. 191 */ 192 u64 bytes_received; /* RFC4898 tcpEStatsAppHCThruOctetsReceived 193 * sum(delta(rcv_nxt)), or how many bytes 194 * were acked. 195 */ 196 u32 segs_in; /* RFC4898 tcpEStatsPerfSegsIn 197 * total number of segments in. 198 */ 199 u32 data_segs_in; /* RFC4898 tcpEStatsPerfDataSegsIn 200 * total number of data segments in. 201 */ 202 u32 rcv_nxt; /* What we want to receive next */ 203 u32 copied_seq; /* Head of yet unread data */ 204 u32 rcv_wup; /* rcv_nxt on last window update sent */ 205 u32 snd_nxt; /* Next sequence we send */ 206 u32 segs_out; /* RFC4898 tcpEStatsPerfSegsOut 207 * The total number of segments sent. 208 */ 209 u32 data_segs_out; /* RFC4898 tcpEStatsPerfDataSegsOut 210 * total number of data segments sent. 211 */ 212 u64 bytes_sent; /* RFC4898 tcpEStatsPerfHCDataOctetsOut 213 * total number of data bytes sent. 214 */ 215 u64 bytes_acked; /* RFC4898 tcpEStatsAppHCThruOctetsAcked 216 * sum(delta(snd_una)), or how many bytes 217 * were acked. 218 */ 219 u32 dsack_dups; /* RFC4898 tcpEStatsStackDSACKDups 220 * total number of DSACK blocks received 221 */ 222 u32 snd_una; /* First byte we want an ack for */ 223 u32 snd_sml; /* Last byte of the most recently transmitted small packet */ 224 u32 rcv_tstamp; /* timestamp of last received ACK (for keepalives) */ 225 u32 lsndtime; /* timestamp of last sent data packet (for restart window) */ 226 u32 last_oow_ack_time; /* timestamp of last out-of-window ACK */ 227 u32 compressed_ack_rcv_nxt; 228 229 u32 tsoffset; /* timestamp offset */ 230 231 struct list_head tsq_node; /* anchor in tsq_tasklet.head list */ 232 struct list_head tsorted_sent_queue; /* time-sorted sent but un-SACKed skbs */ 233 234 u32 snd_wl1; /* Sequence for window update */ 235 u32 snd_wnd; /* The window we expect to receive */ 236 u32 max_window; /* Maximal window ever seen from peer */ 237 u32 mss_cache; /* Cached effective mss, not including SACKS */ 238 239 u32 window_clamp; /* Maximal window to advertise */ 240 u32 rcv_ssthresh; /* Current window clamp */ 241 242 /* Information of the most recently (s)acked skb */ 243 struct tcp_rack { 244 u64 mstamp; /* (Re)sent time of the skb */ 245 u32 rtt_us; /* Associated RTT */ 246 u32 end_seq; /* Ending TCP sequence of the skb */ 247 u32 last_delivered; /* tp->delivered at last reo_wnd adj */ 248 u8 reo_wnd_steps; /* Allowed reordering window */ 249 #define TCP_RACK_RECOVERY_THRESH 16 250 u8 reo_wnd_persist:5, /* No. of recovery since last adj */ 251 dsack_seen:1, /* Whether DSACK seen after last adj */ 252 advanced:1; /* mstamp advanced since last lost marking */ 253 } rack; 254 u16 advmss; /* Advertised MSS */ 255 u8 compressed_ack; 256 u8 dup_ack_counter:2, 257 tlp_retrans:1, /* TLP is a retransmission */ 258 unused:5; 259 u32 chrono_start; /* Start time in jiffies of a TCP chrono */ 260 u32 chrono_stat[3]; /* Time in jiffies for chrono_stat stats */ 261 u8 chrono_type:2, /* current chronograph type */ 262 rate_app_limited:1, /* rate_{delivered,interval_us} limited? */ 263 fastopen_connect:1, /* FASTOPEN_CONNECT sockopt */ 264 fastopen_no_cookie:1, /* Allow send/recv SYN+data without a cookie */ 265 is_sack_reneg:1, /* in recovery from loss with SACK reneg? */ 266 fastopen_client_fail:2; /* reason why fastopen failed */ 267 u8 nonagle : 4,/* Disable Nagle algorithm? */ 268 thin_lto : 1,/* Use linear timeouts for thin streams */ 269 recvmsg_inq : 1,/* Indicate # of bytes in queue upon recvmsg */ 270 repair : 1, 271 frto : 1;/* F-RTO (RFC5682) activated in CA_Loss */ 272 u8 repair_queue; 273 u8 save_syn:2, /* Save headers of SYN packet */ 274 syn_data:1, /* SYN includes data */ 275 syn_fastopen:1, /* SYN includes Fast Open option */ 276 syn_fastopen_exp:1,/* SYN includes Fast Open exp. option */ 277 syn_fastopen_ch:1, /* Active TFO re-enabling probe */ 278 syn_data_acked:1,/* data in SYN is acked by SYN-ACK */ 279 is_cwnd_limited:1;/* forward progress limited by snd_cwnd? */ 280 u32 tlp_high_seq; /* snd_nxt at the time of TLP */ 281 282 u32 tcp_tx_delay; /* delay (in usec) added to TX packets */ 283 u64 tcp_wstamp_ns; /* departure time for next sent data packet */ 284 u64 tcp_clock_cache; /* cache last tcp_clock_ns() (see tcp_mstamp_refresh()) */ 285 286 /* RTT measurement */ 287 u64 tcp_mstamp; /* most recent packet received/sent */ 288 u32 srtt_us; /* smoothed round trip time << 3 in usecs */ 289 u32 mdev_us; /* medium deviation */ 290 u32 mdev_max_us; /* maximal mdev for the last rtt period */ 291 u32 rttvar_us; /* smoothed mdev_max */ 292 u32 rtt_seq; /* sequence number to update rttvar */ 293 struct minmax rtt_min; 294 295 u32 packets_out; /* Packets which are "in flight" */ 296 u32 retrans_out; /* Retransmitted packets out */ 297 u32 max_packets_out; /* max packets_out in last window */ 298 u32 cwnd_usage_seq; /* right edge of cwnd usage tracking flight */ 299 300 u16 urg_data; /* Saved octet of OOB data and control flags */ 301 u8 ecn_flags; /* ECN status bits. */ 302 u8 keepalive_probes; /* num of allowed keep alive probes */ 303 u32 reordering; /* Packet reordering metric. */ 304 u32 reord_seen; /* number of data packet reordering events */ 305 u32 snd_up; /* Urgent pointer */ 306 307 /* 308 * Options received (usually on last packet, some only on SYN packets). 309 */ 310 struct tcp_options_received rx_opt; 311 312 /* 313 * Slow start and congestion control (see also Nagle, and Karn & Partridge) 314 */ 315 u32 snd_ssthresh; /* Slow start size threshold */ 316 u32 snd_cwnd; /* Sending congestion window */ 317 u32 snd_cwnd_cnt; /* Linear increase counter */ 318 u32 snd_cwnd_clamp; /* Do not allow snd_cwnd to grow above this */ 319 u32 snd_cwnd_used; 320 u32 snd_cwnd_stamp; 321 u32 prior_cwnd; /* cwnd right before starting loss recovery */ 322 u32 prr_delivered; /* Number of newly delivered packets to 323 * receiver in Recovery. */ 324 u32 prr_out; /* Total number of pkts sent during Recovery. */ 325 u32 delivered; /* Total data packets delivered incl. rexmits */ 326 u32 delivered_ce; /* Like the above but only ECE marked packets */ 327 u32 lost; /* Total data packets lost incl. rexmits */ 328 u32 app_limited; /* limited until "delivered" reaches this val */ 329 u64 first_tx_mstamp; /* start of window send phase */ 330 u64 delivered_mstamp; /* time we reached "delivered" */ 331 u32 rate_delivered; /* saved rate sample: packets delivered */ 332 u32 rate_interval_us; /* saved rate sample: time elapsed */ 333 334 u32 rcv_wnd; /* Current receiver window */ 335 u32 write_seq; /* Tail(+1) of data held in tcp send buffer */ 336 u32 notsent_lowat; /* TCP_NOTSENT_LOWAT */ 337 u32 pushed_seq; /* Last pushed seq, required to talk to windows */ 338 u32 lost_out; /* Lost packets */ 339 u32 sacked_out; /* SACK'd packets */ 340 341 struct hrtimer pacing_timer; 342 struct hrtimer compressed_ack_timer; 343 344 /* from STCP, retrans queue hinting */ 345 struct sk_buff* lost_skb_hint; 346 struct sk_buff *retransmit_skb_hint; 347 348 /* OOO segments go in this rbtree. Socket lock must be held. */ 349 struct rb_root out_of_order_queue; 350 struct sk_buff *ooo_last_skb; /* cache rb_last(out_of_order_queue) */ 351 352 /* SACKs data, these 2 need to be together (see tcp_options_write) */ 353 struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */ 354 struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/ 355 356 struct tcp_sack_block recv_sack_cache[4]; 357 358 struct sk_buff *highest_sack; /* skb just after the highest 359 * skb with SACKed bit set 360 * (validity guaranteed only if 361 * sacked_out > 0) 362 */ 363 364 int lost_cnt_hint; 365 366 u32 prior_ssthresh; /* ssthresh saved at recovery start */ 367 u32 high_seq; /* snd_nxt at onset of congestion */ 368 369 u32 retrans_stamp; /* Timestamp of the last retransmit, 370 * also used in SYN-SENT to remember stamp of 371 * the first SYN. */ 372 u32 undo_marker; /* snd_una upon a new recovery episode. */ 373 int undo_retrans; /* number of undoable retransmissions. */ 374 u64 bytes_retrans; /* RFC4898 tcpEStatsPerfOctetsRetrans 375 * Total data bytes retransmitted 376 */ 377 u32 total_retrans; /* Total retransmits for entire connection */ 378 379 u32 urg_seq; /* Seq of received urgent pointer */ 380 unsigned int keepalive_time; /* time before keep alive takes place */ 381 unsigned int keepalive_intvl; /* time interval between keep alive probes */ 382 383 int linger2; 384 385 386 /* Sock_ops bpf program related variables */ 387 #ifdef CONFIG_BPF 388 u8 bpf_sock_ops_cb_flags; /* Control calling BPF programs 389 * values defined in uapi/linux/tcp.h 390 */ 391 u8 bpf_chg_cc_inprogress:1; /* In the middle of 392 * bpf_setsockopt(TCP_CONGESTION), 393 * it is to avoid the bpf_tcp_cc->init() 394 * to recur itself by calling 395 * bpf_setsockopt(TCP_CONGESTION, "itself"). 396 */ 397 #define BPF_SOCK_OPS_TEST_FLAG(TP, ARG) (TP->bpf_sock_ops_cb_flags & ARG) 398 #else 399 #define BPF_SOCK_OPS_TEST_FLAG(TP, ARG) 0 400 #endif 401 402 u16 timeout_rehash; /* Timeout-triggered rehash attempts */ 403 404 u32 rcv_ooopack; /* Received out-of-order packets, for tcpinfo */ 405 406 /* Receiver side RTT estimation */ 407 u32 rcv_rtt_last_tsecr; 408 struct { 409 u32 rtt_us; 410 u32 seq; 411 u64 time; 412 } rcv_rtt_est; 413 414 /* Receiver queue space */ 415 struct { 416 u32 space; 417 u32 seq; 418 u64 time; 419 } rcvq_space; 420 421 /* TCP-specific MTU probe information. */ 422 struct { 423 u32 probe_seq_start; 424 u32 probe_seq_end; 425 } mtu_probe; 426 u32 mtu_info; /* We received an ICMP_FRAG_NEEDED / ICMPV6_PKT_TOOBIG 427 * while socket was owned by user. 428 */ 429 #if IS_ENABLED(CONFIG_MPTCP) 430 bool is_mptcp; 431 #endif 432 #if IS_ENABLED(CONFIG_SMC) 433 bool (*smc_hs_congested)(const struct sock *sk); 434 bool syn_smc; /* SYN includes SMC */ 435 #endif 436 437 #ifdef CONFIG_TCP_MD5SIG 438 /* TCP AF-Specific parts; only used by MD5 Signature support so far */ 439 const struct tcp_sock_af_ops *af_specific; 440 441 /* TCP MD5 Signature Option information */ 442 struct tcp_md5sig_info __rcu *md5sig_info; 443 #endif 444 445 /* TCP fastopen related information */ 446 struct tcp_fastopen_request *fastopen_req; 447 /* fastopen_rsk points to request_sock that resulted in this big 448 * socket. Used to retransmit SYNACKs etc. 449 */ 450 struct request_sock __rcu *fastopen_rsk; 451 struct saved_syn *saved_syn; 452 }; 453 454 enum tsq_enum { 455 TSQ_THROTTLED, 456 TSQ_QUEUED, 457 TCP_TSQ_DEFERRED, /* tcp_tasklet_func() found socket was owned */ 458 TCP_WRITE_TIMER_DEFERRED, /* tcp_write_timer() found socket was owned */ 459 TCP_DELACK_TIMER_DEFERRED, /* tcp_delack_timer() found socket was owned */ 460 TCP_MTU_REDUCED_DEFERRED, /* tcp_v{4|6}_err() could not call 461 * tcp_v{4|6}_mtu_reduced() 462 */ 463 }; 464 465 enum tsq_flags { 466 TSQF_THROTTLED = (1UL << TSQ_THROTTLED), 467 TSQF_QUEUED = (1UL << TSQ_QUEUED), 468 TCPF_TSQ_DEFERRED = (1UL << TCP_TSQ_DEFERRED), 469 TCPF_WRITE_TIMER_DEFERRED = (1UL << TCP_WRITE_TIMER_DEFERRED), 470 TCPF_DELACK_TIMER_DEFERRED = (1UL << TCP_DELACK_TIMER_DEFERRED), 471 TCPF_MTU_REDUCED_DEFERRED = (1UL << TCP_MTU_REDUCED_DEFERRED), 472 }; 473 474 static inline struct tcp_sock *tcp_sk(const struct sock *sk) 475 { 476 return (struct tcp_sock *)sk; 477 } 478 479 struct tcp_timewait_sock { 480 struct inet_timewait_sock tw_sk; 481 #define tw_rcv_nxt tw_sk.__tw_common.skc_tw_rcv_nxt 482 #define tw_snd_nxt tw_sk.__tw_common.skc_tw_snd_nxt 483 u32 tw_rcv_wnd; 484 u32 tw_ts_offset; 485 u32 tw_ts_recent; 486 487 /* The time we sent the last out-of-window ACK: */ 488 u32 tw_last_oow_ack_time; 489 490 int tw_ts_recent_stamp; 491 u32 tw_tx_delay; 492 #ifdef CONFIG_TCP_MD5SIG 493 struct tcp_md5sig_key *tw_md5_key; 494 #endif 495 }; 496 497 static inline struct tcp_timewait_sock *tcp_twsk(const struct sock *sk) 498 { 499 return (struct tcp_timewait_sock *)sk; 500 } 501 502 static inline bool tcp_passive_fastopen(const struct sock *sk) 503 { 504 return sk->sk_state == TCP_SYN_RECV && 505 rcu_access_pointer(tcp_sk(sk)->fastopen_rsk) != NULL; 506 } 507 508 static inline void fastopen_queue_tune(struct sock *sk, int backlog) 509 { 510 struct request_sock_queue *queue = &inet_csk(sk)->icsk_accept_queue; 511 int somaxconn = READ_ONCE(sock_net(sk)->core.sysctl_somaxconn); 512 513 queue->fastopenq.max_qlen = min_t(unsigned int, backlog, somaxconn); 514 } 515 516 static inline void tcp_move_syn(struct tcp_sock *tp, 517 struct request_sock *req) 518 { 519 tp->saved_syn = req->saved_syn; 520 req->saved_syn = NULL; 521 } 522 523 static inline void tcp_saved_syn_free(struct tcp_sock *tp) 524 { 525 kfree(tp->saved_syn); 526 tp->saved_syn = NULL; 527 } 528 529 static inline u32 tcp_saved_syn_len(const struct saved_syn *saved_syn) 530 { 531 return saved_syn->mac_hdrlen + saved_syn->network_hdrlen + 532 saved_syn->tcp_hdrlen; 533 } 534 535 struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk, 536 const struct sk_buff *orig_skb, 537 const struct sk_buff *ack_skb); 538 539 static inline u16 tcp_mss_clamp(const struct tcp_sock *tp, u16 mss) 540 { 541 /* We use READ_ONCE() here because socket might not be locked. 542 * This happens for listeners. 543 */ 544 u16 user_mss = READ_ONCE(tp->rx_opt.user_mss); 545 546 return (user_mss && user_mss < mss) ? user_mss : mss; 547 } 548 549 int tcp_skb_shift(struct sk_buff *to, struct sk_buff *from, int pcount, 550 int shiftlen); 551 552 void __tcp_sock_set_cork(struct sock *sk, bool on); 553 void tcp_sock_set_cork(struct sock *sk, bool on); 554 int tcp_sock_set_keepcnt(struct sock *sk, int val); 555 int tcp_sock_set_keepidle_locked(struct sock *sk, int val); 556 int tcp_sock_set_keepidle(struct sock *sk, int val); 557 int tcp_sock_set_keepintvl(struct sock *sk, int val); 558 void __tcp_sock_set_nodelay(struct sock *sk, bool on); 559 void tcp_sock_set_nodelay(struct sock *sk); 560 void tcp_sock_set_quickack(struct sock *sk, int val); 561 int tcp_sock_set_syncnt(struct sock *sk, int val); 562 void tcp_sock_set_user_timeout(struct sock *sk, u32 val); 563 564 #endif /* _LINUX_TCP_H */ 565