299 struct tcp_sock {  struct
301 	struct inet_connection_sock	inet_conn;
302 	u16	tcp_header_len;	/* Bytes of tcp header to send		*/
303 	u16	xmit_size_goal_segs; /* Goal for segmenting output packets */
309 	__be32	pred_flags;
316  	u32	rcv_nxt;	/* What we want to receive next 	*/
317 	u32	copied_seq;	/* Head of yet unread data		*/
318 	u32	rcv_wup;	/* rcv_nxt on last window update sent	*/
319  	u32	snd_nxt;	/* Next sequence we send		*/
321  	u32	snd_una;	/* First byte we want an ack for	*/
322  	u32	snd_sml;	/* Last byte of the most recently transmitted small packet */
323 	u32	rcv_tstamp;	/* timestamp of last received ACK (for keepalives) */
324 	u32	lsndtime;	/* timestamp of last sent data packet (for restart window) */
327 	struct {
340 	} ucopy;
342 	u32	snd_wl1;	/* Sequence for window update		*/
343 	u32	snd_wnd;	/* The window we expect to receive	*/
344 	u32	max_window;	/* Maximal window ever seen from peer	*/
345 	u32	mss_cache;	/* Cached effective mss, not including SACKS */
347 	u32	window_clamp;	/* Maximal window to advertise		*/
348 	u32	rcv_ssthresh;	/* Current window clamp			*/
350 	u32	frto_highmark;	/* snd_nxt when RTO occurred */
351 	u16	advmss;		/* Advertised MSS			*/
352 	u8	frto_counter;	/* Number of new acks after RTO */
353 	u8	nonagle     : 4,/* Disable Nagle algorithm?             */
354 		thin_lto    : 1,/* Use linear timeouts for thin streams */
355 		thin_dupack : 1,/* Fast retransmit on first dupack      */
356 		unused      : 2;
359 	u32	srtt;		/* smoothed round trip time << 3	*/
360 	u32	mdev;		/* medium deviation			*/
361 	u32	mdev_max;	/* maximal mdev for the last rtt period	*/
362 	u32	rttvar;		/* smoothed mdev_max			*/
363 	u32	rtt_seq;	/* sequence number to update rttvar	*/
365 	u32	packets_out;	/* Packets which are "in flight"	*/
366 	u32	retrans_out;	/* Retransmitted packets out		*/
368 	u16	urg_data;	/* Saved octet of OOB data and control flags */
369 	u8	ecn_flags;	/* ECN status bits.			*/
370 	u8	reordering;	/* Packet reordering metric.		*/
371 	u32	snd_up;		/* Urgent pointer		*/
373 	u8	keepalive_probes; /* num of allowed keep alive probes	*/
377 	struct tcp_options_received rx_opt;
382  	u32	snd_ssthresh;	/* Slow start size threshold		*/
383  	u32	snd_cwnd;	/* Sending congestion window		*/
384 	u32	snd_cwnd_cnt;	/* Linear increase counter		*/
385 	u32	snd_cwnd_clamp; /* Do not allow snd_cwnd to grow above this */
386 	u32	snd_cwnd_used;
387 	u32	snd_cwnd_stamp;
388 	u32	prior_cwnd;	/* Congestion window at start of Recovery. */
389 	u32	prr_delivered;	/* Number of newly delivered packets to
391 	u32	prr_out;	/* Total number of pkts sent during Recovery. */
393  	u32	rcv_wnd;	/* Current receiver window		*/
394 	u32	write_seq;	/* Tail(+1) of data held in tcp send buffer */
395 	u32	pushed_seq;	/* Last pushed seq, required to talk to windows */
396 	u32	lost_out;	/* Lost packets			*/
397 	u32	sacked_out;	/* SACK'd packets			*/
398 	u32	fackets_out;	/* FACK'd packets			*/
399 	u32	tso_deferred;
400 	u32	bytes_acked;	/* Appropriate Byte Counting - RFC3465 */
403 	struct sk_buff* lost_skb_hint;
404 	struct sk_buff *scoreboard_skb_hint;
405 	struct sk_buff *retransmit_skb_hint;
407 	struct sk_buff_head	out_of_order_queue; /* Out of order segments go here */
410 	struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */
411 	struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/
413 	struct tcp_sack_block recv_sack_cache[4];
415 	struct sk_buff *highest_sack;   /* skb just after the highest
421 	int     lost_cnt_hint;
422 	u32     retransmit_high;	/* L-bits may be on up to this seqno */
424 	u32	lost_retrans_low;	/* Sent seq after any rxmit (lowest) */
426 	u32	prior_ssthresh; /* ssthresh saved at recovery start	*/
427 	u32	high_seq;	/* snd_nxt at onset of congestion	*/
429 	u32	retrans_stamp;	/* Timestamp of the last retransmit,
432 	u32	undo_marker;	/* tracking retrans started here. */
433 	int	undo_retrans;	/* number of undoable retransmissions. */
434 	u32	total_retrans;	/* Total retransmits for entire connection */
436 	u32	urg_seq;	/* Seq of received urgent pointer */
437 	unsigned int		keepalive_time;	  /* time before keep alive takes place */
438 	unsigned int		keepalive_intvl;  /* time interval between keep alive probes */
440 	int			linger2;
464 	const struct tcp_sock_af_ops	*af_specific;  argument
477 static inline struct tcp_sock *tcp_sk(const struct sock *sk)  in tcp_sk()  argument