132 struct tcp_sock {  struct
134 	struct inet_connection_sock	inet_conn;
135 	u16	tcp_header_len;	/* Bytes of tcp header to send		*/
136 	u16	gso_segs;	/* Max number of segs per GSO packet	*/
142 	__be32	pred_flags;
149 	u64	bytes_received;	/* RFC4898 tcpEStatsAppHCThruOctetsReceived
153 	u32	segs_in;	/* RFC4898 tcpEStatsPerfSegsIn
156  	u32	rcv_nxt;	/* What we want to receive next 	*/
157 	u32	copied_seq;	/* Head of yet unread data		*/
158 	u32	rcv_wup;	/* rcv_nxt on last window update sent	*/
159  	u32	snd_nxt;	/* Next sequence we send		*/
160 	u32	segs_out;	/* RFC4898 tcpEStatsPerfSegsOut
163 	u64	bytes_acked;	/* RFC4898 tcpEStatsAppHCThruOctetsAcked
167 	struct u64_stats_sync syncp; /* protects 64bit vars (cf tcp_get_info()) */
169  	u32	snd_una;	/* First byte we want an ack for	*/
170  	u32	snd_sml;	/* Last byte of the most recently transmitted small packet */
171 	u32	rcv_tstamp;	/* timestamp of last received ACK (for keepalives) */
172 	u32	lsndtime;	/* timestamp of last sent data packet (for restart window) */
173 	u32	last_oow_ack_time;  /* timestamp of last out-of-window ACK */
175 	u32	tsoffset;	/* timestamp offset */
177 	struct list_head tsq_node; /* anchor in tsq_tasklet.head list */
178 	unsigned long	tsq_flags;
181 	struct {
187 	} ucopy;
189 	u32	snd_wl1;	/* Sequence for window update		*/
190 	u32	snd_wnd;	/* The window we expect to receive	*/
191 	u32	max_window;	/* Maximal window ever seen from peer	*/
192 	u32	mss_cache;	/* Cached effective mss, not including SACKS */
194 	u32	window_clamp;	/* Maximal window to advertise		*/
195 	u32	rcv_ssthresh;	/* Current window clamp			*/
198 	struct tcp_rack {
202 	} rack;
203 	u16	advmss;		/* Advertised MSS			*/
204 	u8	unused;
205 	u8	nonagle     : 4,/* Disable Nagle algorithm?             */
206 		thin_lto    : 1,/* Use linear timeouts for thin streams */
207 		thin_dupack : 1,/* Fast retransmit on first dupack      */
208 		repair      : 1,
209 		frto        : 1;/* F-RTO (RFC5682) activated in CA_Loss */
210 	u8	repair_queue;
211 	u8	do_early_retrans:1,/* Enable RFC5827 early-retransmit  */
212 		syn_data:1,	/* SYN includes data */
213 		syn_fastopen:1,	/* SYN includes Fast Open option */
214 		syn_fastopen_exp:1,/* SYN includes Fast Open exp. option */
215 		syn_data_acked:1,/* data in SYN is acked by SYN-ACK */
216 		save_syn:1,	/* Save headers of SYN packet */
217 		is_cwnd_limited:1;/* forward progress limited by snd_cwnd? */
218 	u32	tlp_high_seq;	/* snd_nxt at the time of TLP retransmit. */
221 	u32	srtt_us;	/* smoothed round trip time << 3 in usecs */
222 	u32	mdev_us;	/* medium deviation			*/
223 	u32	mdev_max_us;	/* maximal mdev for the last rtt period	*/
224 	u32	rttvar_us;	/* smoothed mdev_max			*/
225 	u32	rtt_seq;	/* sequence number to update rttvar	*/
226 	struct rtt_meas {
228 	} rtt_min[3];
230 	u32	packets_out;	/* Packets which are "in flight"	*/
231 	u32	retrans_out;	/* Retransmitted packets out		*/
232 	u32	max_packets_out;  /* max packets_out in last window */
233 	u32	max_packets_seq;  /* right edge of max_packets_out flight */
235 	u16	urg_data;	/* Saved octet of OOB data and control flags */
236 	u8	ecn_flags;	/* ECN status bits.			*/
237 	u8	keepalive_probes; /* num of allowed keep alive probes	*/
238 	u32	reordering;	/* Packet reordering metric.		*/
239 	u32	snd_up;		/* Urgent pointer		*/
244 	struct tcp_options_received rx_opt;
249  	u32	snd_ssthresh;	/* Slow start size threshold		*/
250  	u32	snd_cwnd;	/* Sending congestion window		*/
251 	u32	snd_cwnd_cnt;	/* Linear increase counter		*/
252 	u32	snd_cwnd_clamp; /* Do not allow snd_cwnd to grow above this */
253 	u32	snd_cwnd_used;
254 	u32	snd_cwnd_stamp;
255 	u32	prior_cwnd;	/* Congestion window at start of Recovery. */
256 	u32	prr_delivered;	/* Number of newly delivered packets to
258 	u32	prr_out;	/* Total number of pkts sent during Recovery. */
260  	u32	rcv_wnd;	/* Current receiver window		*/
261 	u32	write_seq;	/* Tail(+1) of data held in tcp send buffer */
262 	u32	notsent_lowat;	/* TCP_NOTSENT_LOWAT */
263 	u32	pushed_seq;	/* Last pushed seq, required to talk to windows */
264 	u32	lost_out;	/* Lost packets			*/
265 	u32	sacked_out;	/* SACK'd packets			*/
266 	u32	fackets_out;	/* FACK'd packets			*/
269 	struct sk_buff* lost_skb_hint;
270 	struct sk_buff *retransmit_skb_hint;
275 	struct sk_buff_head	out_of_order_queue;
278 	struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */
279 	struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/
281 	struct tcp_sack_block recv_sack_cache[4];
283 	struct sk_buff *highest_sack;   /* skb just after the highest
289 	int     lost_cnt_hint;
290 	u32     retransmit_high;	/* L-bits may be on up to this seqno */
292 	u32	prior_ssthresh; /* ssthresh saved at recovery start	*/
293 	u32	high_seq;	/* snd_nxt at onset of congestion	*/
295 	u32	retrans_stamp;	/* Timestamp of the last retransmit,
298 	u32	undo_marker;	/* snd_una upon a new recovery episode. */
299 	int	undo_retrans;	/* number of undoable retransmissions. */
300 	u32	total_retrans;	/* Total retransmits for entire connection */
302 	u32	urg_seq;	/* Seq of received urgent pointer */
303 	unsigned int		keepalive_time;	  /* time before keep alive takes place */
304 	unsigned int		keepalive_intvl;  /* time interval between keep alive probes */
306 	int			linger2;
309 	struct {
333 	const struct tcp_sock_af_ops	*af_specific;  argument
359 static inline struct tcp_sock *tcp_sk(const struct sock *sk)  in tcp_sk()  argument