linux/include/linux/tcp.h
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   1/*
   2 * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3 *              operating system.  INET is implemented using the  BSD Socket
   4 *              interface as the means of communication with the user level.
   5 *
   6 *              Definitions for the TCP protocol.
   7 *
   8 * Version:     @(#)tcp.h       1.0.2   04/28/93
   9 *
  10 * Author:      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  11 *
  12 *              This program is free software; you can redistribute it and/or
  13 *              modify it under the terms of the GNU General Public License
  14 *              as published by the Free Software Foundation; either version
  15 *              2 of the License, or (at your option) any later version.
  16 */
  17#ifndef _LINUX_TCP_H
  18#define _LINUX_TCP_H
  19
  20#include <linux/types.h>
  21#include <asm/byteorder.h>
  22#include <linux/socket.h>
  23
  24struct tcphdr {
  25        __be16  source;
  26        __be16  dest;
  27        __be32  seq;
  28        __be32  ack_seq;
  29#if defined(__LITTLE_ENDIAN_BITFIELD)
  30        __u16   res1:4,
  31                doff:4,
  32                fin:1,
  33                syn:1,
  34                rst:1,
  35                psh:1,
  36                ack:1,
  37                urg:1,
  38                ece:1,
  39                cwr:1;
  40#elif defined(__BIG_ENDIAN_BITFIELD)
  41        __u16   doff:4,
  42                res1:4,
  43                cwr:1,
  44                ece:1,
  45                urg:1,
  46                ack:1,
  47                psh:1,
  48                rst:1,
  49                syn:1,
  50                fin:1;
  51#else
  52#error  "Adjust your <asm/byteorder.h> defines"
  53#endif  
  54        __be16  window;
  55        __sum16 check;
  56        __be16  urg_ptr;
  57};
  58
  59/*
  60 *      The union cast uses a gcc extension to avoid aliasing problems
  61 *  (union is compatible to any of its members)
  62 *  This means this part of the code is -fstrict-aliasing safe now.
  63 */
  64union tcp_word_hdr { 
  65        struct tcphdr hdr;
  66        __be32            words[5];
  67}; 
  68
  69#define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3]) 
  70
  71enum { 
  72        TCP_FLAG_CWR = __constant_cpu_to_be32(0x00800000),
  73        TCP_FLAG_ECE = __constant_cpu_to_be32(0x00400000),
  74        TCP_FLAG_URG = __constant_cpu_to_be32(0x00200000),
  75        TCP_FLAG_ACK = __constant_cpu_to_be32(0x00100000),
  76        TCP_FLAG_PSH = __constant_cpu_to_be32(0x00080000),
  77        TCP_FLAG_RST = __constant_cpu_to_be32(0x00040000),
  78        TCP_FLAG_SYN = __constant_cpu_to_be32(0x00020000),
  79        TCP_FLAG_FIN = __constant_cpu_to_be32(0x00010000),
  80        TCP_RESERVED_BITS = __constant_cpu_to_be32(0x0F000000),
  81        TCP_DATA_OFFSET = __constant_cpu_to_be32(0xF0000000)
  82}; 
  83
  84/*
  85 * TCP general constants
  86 */
  87#define TCP_MSS_DEFAULT          536U   /* IPv4 (RFC1122, RFC2581) */
  88#define TCP_MSS_DESIRED         1220U   /* IPv6 (tunneled), EDNS0 (RFC3226) */
  89
  90/* TCP socket options */
  91#define TCP_NODELAY             1       /* Turn off Nagle's algorithm. */
  92#define TCP_MAXSEG              2       /* Limit MSS */
  93#define TCP_CORK                3       /* Never send partially complete segments */
  94#define TCP_KEEPIDLE            4       /* Start keeplives after this period */
  95#define TCP_KEEPINTVL           5       /* Interval between keepalives */
  96#define TCP_KEEPCNT             6       /* Number of keepalives before death */
  97#define TCP_SYNCNT              7       /* Number of SYN retransmits */
  98#define TCP_LINGER2             8       /* Life time of orphaned FIN-WAIT-2 state */
  99#define TCP_DEFER_ACCEPT        9       /* Wake up listener only when data arrive */
 100#define TCP_WINDOW_CLAMP        10      /* Bound advertised window */
 101#define TCP_INFO                11      /* Information about this connection. */
 102#define TCP_QUICKACK            12      /* Block/reenable quick acks */
 103#define TCP_CONGESTION          13      /* Congestion control algorithm */
 104#define TCP_MD5SIG              14      /* TCP MD5 Signature (RFC2385) */
 105#define TCP_COOKIE_TRANSACTIONS 15      /* TCP Cookie Transactions */
 106#define TCP_THIN_LINEAR_TIMEOUTS 16      /* Use linear timeouts for thin streams*/
 107#define TCP_THIN_DUPACK         17      /* Fast retrans. after 1 dupack */
 108#define TCP_USER_TIMEOUT        18      /* How long for loss retry before timeout */
 109#define TCP_REPAIR              19      /* TCP sock is under repair right now */
 110#define TCP_REPAIR_QUEUE        20
 111#define TCP_QUEUE_SEQ           21
 112#define TCP_REPAIR_OPTIONS      22
 113
 114struct tcp_repair_opt {
 115        __u32   opt_code;
 116        __u32   opt_val;
 117};
 118
 119enum {
 120        TCP_NO_QUEUE,
 121        TCP_RECV_QUEUE,
 122        TCP_SEND_QUEUE,
 123        TCP_QUEUES_NR,
 124};
 125
 126/* for TCP_INFO socket option */
 127#define TCPI_OPT_TIMESTAMPS     1
 128#define TCPI_OPT_SACK           2
 129#define TCPI_OPT_WSCALE         4
 130#define TCPI_OPT_ECN            8 /* ECN was negociated at TCP session init */
 131#define TCPI_OPT_ECN_SEEN       16 /* we received at least one packet with ECT */
 132
 133enum tcp_ca_state {
 134        TCP_CA_Open = 0,
 135#define TCPF_CA_Open    (1<<TCP_CA_Open)
 136        TCP_CA_Disorder = 1,
 137#define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
 138        TCP_CA_CWR = 2,
 139#define TCPF_CA_CWR     (1<<TCP_CA_CWR)
 140        TCP_CA_Recovery = 3,
 141#define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
 142        TCP_CA_Loss = 4
 143#define TCPF_CA_Loss    (1<<TCP_CA_Loss)
 144};
 145
 146struct tcp_info {
 147        __u8    tcpi_state;
 148        __u8    tcpi_ca_state;
 149        __u8    tcpi_retransmits;
 150        __u8    tcpi_probes;
 151        __u8    tcpi_backoff;
 152        __u8    tcpi_options;
 153        __u8    tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
 154
 155        __u32   tcpi_rto;
 156        __u32   tcpi_ato;
 157        __u32   tcpi_snd_mss;
 158        __u32   tcpi_rcv_mss;
 159
 160        __u32   tcpi_unacked;
 161        __u32   tcpi_sacked;
 162        __u32   tcpi_lost;
 163        __u32   tcpi_retrans;
 164        __u32   tcpi_fackets;
 165
 166        /* Times. */
 167        __u32   tcpi_last_data_sent;
 168        __u32   tcpi_last_ack_sent;     /* Not remembered, sorry. */
 169        __u32   tcpi_last_data_recv;
 170        __u32   tcpi_last_ack_recv;
 171
 172        /* Metrics. */
 173        __u32   tcpi_pmtu;
 174        __u32   tcpi_rcv_ssthresh;
 175        __u32   tcpi_rtt;
 176        __u32   tcpi_rttvar;
 177        __u32   tcpi_snd_ssthresh;
 178        __u32   tcpi_snd_cwnd;
 179        __u32   tcpi_advmss;
 180        __u32   tcpi_reordering;
 181
 182        __u32   tcpi_rcv_rtt;
 183        __u32   tcpi_rcv_space;
 184
 185        __u32   tcpi_total_retrans;
 186};
 187
 188/* for TCP_MD5SIG socket option */
 189#define TCP_MD5SIG_MAXKEYLEN    80
 190
 191struct tcp_md5sig {
 192        struct __kernel_sockaddr_storage tcpm_addr;     /* address associated */
 193        __u16   __tcpm_pad1;                            /* zero */
 194        __u16   tcpm_keylen;                            /* key length */
 195        __u32   __tcpm_pad2;                            /* zero */
 196        __u8    tcpm_key[TCP_MD5SIG_MAXKEYLEN];         /* key (binary) */
 197};
 198
 199/* for TCP_COOKIE_TRANSACTIONS (TCPCT) socket option */
 200#define TCP_COOKIE_MIN           8              /*  64-bits */
 201#define TCP_COOKIE_MAX          16              /* 128-bits */
 202#define TCP_COOKIE_PAIR_SIZE    (2*TCP_COOKIE_MAX)
 203
 204/* Flags for both getsockopt and setsockopt */
 205#define TCP_COOKIE_IN_ALWAYS    (1 << 0)        /* Discard SYN without cookie */
 206#define TCP_COOKIE_OUT_NEVER    (1 << 1)        /* Prohibit outgoing cookies,
 207                                                 * supercedes everything. */
 208
 209/* Flags for getsockopt */
 210#define TCP_S_DATA_IN           (1 << 2)        /* Was data received? */
 211#define TCP_S_DATA_OUT          (1 << 3)        /* Was data sent? */
 212
 213/* TCP_COOKIE_TRANSACTIONS data */
 214struct tcp_cookie_transactions {
 215        __u16   tcpct_flags;                    /* see above */
 216        __u8    __tcpct_pad1;                   /* zero */
 217        __u8    tcpct_cookie_desired;           /* bytes */
 218        __u16   tcpct_s_data_desired;           /* bytes of variable data */
 219        __u16   tcpct_used;                     /* bytes in value */
 220        __u8    tcpct_value[TCP_MSS_DEFAULT];
 221};
 222
 223#ifdef __KERNEL__
 224
 225#include <linux/skbuff.h>
 226#include <linux/dmaengine.h>
 227#include <net/sock.h>
 228#include <net/inet_connection_sock.h>
 229#include <net/inet_timewait_sock.h>
 230
 231static inline struct tcphdr *tcp_hdr(const struct sk_buff *skb)
 232{
 233        return (struct tcphdr *)skb_transport_header(skb);
 234}
 235
 236static inline unsigned int tcp_hdrlen(const struct sk_buff *skb)
 237{
 238        return tcp_hdr(skb)->doff * 4;
 239}
 240
 241static inline unsigned int tcp_optlen(const struct sk_buff *skb)
 242{
 243        return (tcp_hdr(skb)->doff - 5) * 4;
 244}
 245
 246/* TCP Fast Open */
 247#define TCP_FASTOPEN_COOKIE_MIN 4       /* Min Fast Open Cookie size in bytes */
 248#define TCP_FASTOPEN_COOKIE_MAX 16      /* Max Fast Open Cookie size in bytes */
 249
 250/* TCP Fast Open Cookie as stored in memory */
 251struct tcp_fastopen_cookie {
 252        s8      len;
 253        u8      val[TCP_FASTOPEN_COOKIE_MAX];
 254};
 255
 256/* This defines a selective acknowledgement block. */
 257struct tcp_sack_block_wire {
 258        __be32  start_seq;
 259        __be32  end_seq;
 260};
 261
 262struct tcp_sack_block {
 263        u32     start_seq;
 264        u32     end_seq;
 265};
 266
 267/*These are used to set the sack_ok field in struct tcp_options_received */
 268#define TCP_SACK_SEEN     (1 << 0)   /*1 = peer is SACK capable, */
 269#define TCP_FACK_ENABLED  (1 << 1)   /*1 = FACK is enabled locally*/
 270#define TCP_DSACK_SEEN    (1 << 2)   /*1 = DSACK was received from peer*/
 271
 272struct tcp_options_received {
 273/*      PAWS/RTTM data  */
 274        long    ts_recent_stamp;/* Time we stored ts_recent (for aging) */
 275        u32     ts_recent;      /* Time stamp to echo next              */
 276        u32     rcv_tsval;      /* Time stamp value                     */
 277        u32     rcv_tsecr;      /* Time stamp echo reply                */
 278        u16     saw_tstamp : 1, /* Saw TIMESTAMP on last packet         */
 279                tstamp_ok : 1,  /* TIMESTAMP seen on SYN packet         */
 280                dsack : 1,      /* D-SACK is scheduled                  */
 281                wscale_ok : 1,  /* Wscale seen on SYN packet            */
 282                sack_ok : 4,    /* SACK seen on SYN packet              */
 283                snd_wscale : 4, /* Window scaling received from sender  */
 284                rcv_wscale : 4; /* Window scaling to send to receiver   */
 285        u8      cookie_plus:6,  /* bytes in authenticator/cookie option */
 286                cookie_out_never:1,
 287                cookie_in_always:1;
 288        u8      num_sacks;      /* Number of SACK blocks                */
 289        u16     user_mss;       /* mss requested by user in ioctl       */
 290        u16     mss_clamp;      /* Maximal mss, negotiated at connection setup */
 291};
 292
 293static inline void tcp_clear_options(struct tcp_options_received *rx_opt)
 294{
 295        rx_opt->tstamp_ok = rx_opt->sack_ok = 0;
 296        rx_opt->wscale_ok = rx_opt->snd_wscale = 0;
 297        rx_opt->cookie_plus = 0;
 298}
 299
 300/* This is the max number of SACKS that we'll generate and process. It's safe
 301 * to increase this, although since:
 302 *   size = TCPOLEN_SACK_BASE_ALIGNED (4) + n * TCPOLEN_SACK_PERBLOCK (8)
 303 * only four options will fit in a standard TCP header */
 304#define TCP_NUM_SACKS 4
 305
 306struct tcp_cookie_values;
 307struct tcp_request_sock_ops;
 308
 309struct tcp_request_sock {
 310        struct inet_request_sock        req;
 311#ifdef CONFIG_TCP_MD5SIG
 312        /* Only used by TCP MD5 Signature so far. */
 313        const struct tcp_request_sock_ops *af_specific;
 314#endif
 315        u32                             rcv_isn;
 316        u32                             snt_isn;
 317        u32                             snt_synack; /* synack sent time */
 318};
 319
 320static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req)
 321{
 322        return (struct tcp_request_sock *)req;
 323}
 324
 325struct tcp_sock {
 326        /* inet_connection_sock has to be the first member of tcp_sock */
 327        struct inet_connection_sock     inet_conn;
 328        u16     tcp_header_len; /* Bytes of tcp header to send          */
 329        u16     xmit_size_goal_segs; /* Goal for segmenting output packets */
 330
 331/*
 332 *      Header prediction flags
 333 *      0x5?10 << 16 + snd_wnd in net byte order
 334 */
 335        __be32  pred_flags;
 336
 337/*
 338 *      RFC793 variables by their proper names. This means you can
 339 *      read the code and the spec side by side (and laugh ...)
 340 *      See RFC793 and RFC1122. The RFC writes these in capitals.
 341 */
 342        u32     rcv_nxt;        /* What we want to receive next         */
 343        u32     copied_seq;     /* Head of yet unread data              */
 344        u32     rcv_wup;        /* rcv_nxt on last window update sent   */
 345        u32     snd_nxt;        /* Next sequence we send                */
 346
 347        u32     snd_una;        /* First byte we want an ack for        */
 348        u32     snd_sml;        /* Last byte of the most recently transmitted small packet */
 349        u32     rcv_tstamp;     /* timestamp of last received ACK (for keepalives) */
 350        u32     lsndtime;       /* timestamp of last sent data packet (for restart window) */
 351
 352        struct list_head tsq_node; /* anchor in tsq_tasklet.head list */
 353        unsigned long   tsq_flags;
 354
 355        /* Data for direct copy to user */
 356        struct {
 357                struct sk_buff_head     prequeue;
 358                struct task_struct      *task;
 359                struct iovec            *iov;
 360                int                     memory;
 361                int                     len;
 362#ifdef CONFIG_NET_DMA
 363                /* members for async copy */
 364                struct dma_chan         *dma_chan;
 365                int                     wakeup;
 366                struct dma_pinned_list  *pinned_list;
 367                dma_cookie_t            dma_cookie;
 368#endif
 369        } ucopy;
 370
 371        u32     snd_wl1;        /* Sequence for window update           */
 372        u32     snd_wnd;        /* The window we expect to receive      */
 373        u32     max_window;     /* Maximal window ever seen from peer   */
 374        u32     mss_cache;      /* Cached effective mss, not including SACKS */
 375
 376        u32     window_clamp;   /* Maximal window to advertise          */
 377        u32     rcv_ssthresh;   /* Current window clamp                 */
 378
 379        u32     frto_highmark;  /* snd_nxt when RTO occurred */
 380        u16     advmss;         /* Advertised MSS                       */
 381        u8      frto_counter;   /* Number of new acks after RTO */
 382        u8      nonagle     : 4,/* Disable Nagle algorithm?             */
 383                thin_lto    : 1,/* Use linear timeouts for thin streams */
 384                thin_dupack : 1,/* Fast retransmit on first dupack      */
 385                repair      : 1,
 386                unused      : 1;
 387        u8      repair_queue;
 388        u8      do_early_retrans:1,/* Enable RFC5827 early-retransmit  */
 389                early_retrans_delayed:1, /* Delayed ER timer installed */
 390                syn_data:1,     /* SYN includes data */
 391                syn_fastopen:1; /* SYN includes Fast Open option */
 392
 393/* RTT measurement */
 394        u32     srtt;           /* smoothed round trip time << 3        */
 395        u32     mdev;           /* medium deviation                     */
 396        u32     mdev_max;       /* maximal mdev for the last rtt period */
 397        u32     rttvar;         /* smoothed mdev_max                    */
 398        u32     rtt_seq;        /* sequence number to update rttvar     */
 399
 400        u32     packets_out;    /* Packets which are "in flight"        */
 401        u32     retrans_out;    /* Retransmitted packets out            */
 402
 403        u16     urg_data;       /* Saved octet of OOB data and control flags */
 404        u8      ecn_flags;      /* ECN status bits.                     */
 405        u8      reordering;     /* Packet reordering metric.            */
 406        u32     snd_up;         /* Urgent pointer               */
 407
 408        u8      keepalive_probes; /* num of allowed keep alive probes   */
 409/*
 410 *      Options received (usually on last packet, some only on SYN packets).
 411 */
 412        struct tcp_options_received rx_opt;
 413
 414/*
 415 *      Slow start and congestion control (see also Nagle, and Karn & Partridge)
 416 */
 417        u32     snd_ssthresh;   /* Slow start size threshold            */
 418        u32     snd_cwnd;       /* Sending congestion window            */
 419        u32     snd_cwnd_cnt;   /* Linear increase counter              */
 420        u32     snd_cwnd_clamp; /* Do not allow snd_cwnd to grow above this */
 421        u32     snd_cwnd_used;
 422        u32     snd_cwnd_stamp;
 423        u32     prior_cwnd;     /* Congestion window at start of Recovery. */
 424        u32     prr_delivered;  /* Number of newly delivered packets to
 425                                 * receiver in Recovery. */
 426        u32     prr_out;        /* Total number of pkts sent during Recovery. */
 427
 428        u32     rcv_wnd;        /* Current receiver window              */
 429        u32     write_seq;      /* Tail(+1) of data held in tcp send buffer */
 430        u32     pushed_seq;     /* Last pushed seq, required to talk to windows */
 431        u32     lost_out;       /* Lost packets                 */
 432        u32     sacked_out;     /* SACK'd packets                       */
 433        u32     fackets_out;    /* FACK'd packets                       */
 434        u32     tso_deferred;
 435        u32     bytes_acked;    /* Appropriate Byte Counting - RFC3465 */
 436
 437        /* from STCP, retrans queue hinting */
 438        struct sk_buff* lost_skb_hint;
 439        struct sk_buff *scoreboard_skb_hint;
 440        struct sk_buff *retransmit_skb_hint;
 441
 442        struct sk_buff_head     out_of_order_queue; /* Out of order segments go here */
 443
 444        /* SACKs data, these 2 need to be together (see tcp_options_write) */
 445        struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */
 446        struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/
 447
 448        struct tcp_sack_block recv_sack_cache[4];
 449
 450        struct sk_buff *highest_sack;   /* skb just after the highest
 451                                         * skb with SACKed bit set
 452                                         * (validity guaranteed only if
 453                                         * sacked_out > 0)
 454                                         */
 455
 456        int     lost_cnt_hint;
 457        u32     retransmit_high;        /* L-bits may be on up to this seqno */
 458
 459        u32     lost_retrans_low;       /* Sent seq after any rxmit (lowest) */
 460
 461        u32     prior_ssthresh; /* ssthresh saved at recovery start     */
 462        u32     high_seq;       /* snd_nxt at onset of congestion       */
 463
 464        u32     retrans_stamp;  /* Timestamp of the last retransmit,
 465                                 * also used in SYN-SENT to remember stamp of
 466                                 * the first SYN. */
 467        u32     undo_marker;    /* tracking retrans started here. */
 468        int     undo_retrans;   /* number of undoable retransmissions. */
 469        u32     total_retrans;  /* Total retransmits for entire connection */
 470
 471        u32     urg_seq;        /* Seq of received urgent pointer */
 472        unsigned int            keepalive_time;   /* time before keep alive takes place */
 473        unsigned int            keepalive_intvl;  /* time interval between keep alive probes */
 474
 475        int                     linger2;
 476
 477/* Receiver side RTT estimation */
 478        struct {
 479                u32     rtt;
 480                u32     seq;
 481                u32     time;
 482        } rcv_rtt_est;
 483
 484/* Receiver queue space */
 485        struct {
 486                int     space;
 487                u32     seq;
 488                u32     time;
 489        } rcvq_space;
 490
 491/* TCP-specific MTU probe information. */
 492        struct {
 493                u32               probe_seq_start;
 494                u32               probe_seq_end;
 495        } mtu_probe;
 496        u32     mtu_info; /* We received an ICMP_FRAG_NEEDED / ICMPV6_PKT_TOOBIG
 497                           * while socket was owned by user.
 498                           */
 499
 500#ifdef CONFIG_TCP_MD5SIG
 501/* TCP AF-Specific parts; only used by MD5 Signature support so far */
 502        const struct tcp_sock_af_ops    *af_specific;
 503
 504/* TCP MD5 Signature Option information */
 505        struct tcp_md5sig_info  __rcu *md5sig_info;
 506#endif
 507
 508/* TCP fastopen related information */
 509        struct tcp_fastopen_request *fastopen_req;
 510
 511        /* When the cookie options are generated and exchanged, then this
 512         * object holds a reference to them (cookie_values->kref).  Also
 513         * contains related tcp_cookie_transactions fields.
 514         */
 515        struct tcp_cookie_values  *cookie_values;
 516};
 517
 518enum tsq_flags {
 519        TSQ_THROTTLED,
 520        TSQ_QUEUED,
 521        TCP_TSQ_DEFERRED,          /* tcp_tasklet_func() found socket was owned */
 522        TCP_WRITE_TIMER_DEFERRED,  /* tcp_write_timer() found socket was owned */
 523        TCP_DELACK_TIMER_DEFERRED, /* tcp_delack_timer() found socket was owned */
 524        TCP_MTU_REDUCED_DEFERRED,  /* tcp_v{4|6}_err() could not call
 525                                    * tcp_v{4|6}_mtu_reduced()
 526                                    */
 527};
 528
 529static inline struct tcp_sock *tcp_sk(const struct sock *sk)
 530{
 531        return (struct tcp_sock *)sk;
 532}
 533
 534struct tcp_timewait_sock {
 535        struct inet_timewait_sock tw_sk;
 536        u32                       tw_rcv_nxt;
 537        u32                       tw_snd_nxt;
 538        u32                       tw_rcv_wnd;
 539        u32                       tw_ts_recent;
 540        long                      tw_ts_recent_stamp;
 541#ifdef CONFIG_TCP_MD5SIG
 542        struct tcp_md5sig_key     *tw_md5_key;
 543#endif
 544        /* Few sockets in timewait have cookies; in that case, then this
 545         * object holds a reference to them (tw_cookie_values->kref).
 546         */
 547        struct tcp_cookie_values  *tw_cookie_values;
 548};
 549
 550static inline struct tcp_timewait_sock *tcp_twsk(const struct sock *sk)
 551{
 552        return (struct tcp_timewait_sock *)sk;
 553}
 554
 555#endif  /* __KERNEL__ */
 556
 557#endif  /* _LINUX_TCP_H */
 558
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