[mirror_ubuntu-artful-kernel.git] / include / linux / tcp.h

/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Definitions for the TCP protocol.
 *
 * Version:	@(#)tcp.h	1.0.2	04/28/93
 *
 * Author:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 */
#ifndef _LINUX_TCP_H
#define _LINUX_TCP_H

#include <linux/types.h>
#include <asm/byteorder.h>

struct tcphdr {
	__u16	source;
	__u16	dest;
	__u32	seq;
	__u32	ack_seq;
#if defined(__LITTLE_ENDIAN_BITFIELD)
	__u16	res1:4,
		doff:4,
		fin:1,
		syn:1,
		rst:1,
		psh:1,
		ack:1,
		urg:1,
		ece:1,
		cwr:1;
#elif defined(__BIG_ENDIAN_BITFIELD)
	__u16	doff:4,
		res1:4,
		cwr:1,
		ece:1,
		urg:1,
		ack:1,
		psh:1,
		rst:1,
		syn:1,
		fin:1;
#else
#error	"Adjust your <asm/byteorder.h> defines"
#endif	
	__u16	window;
	__u16	check;
	__u16	urg_ptr;
};


enum {
  TCP_ESTABLISHED = 1,
  TCP_SYN_SENT,
  TCP_SYN_RECV,
  TCP_FIN_WAIT1,
  TCP_FIN_WAIT2,
  TCP_TIME_WAIT,
  TCP_CLOSE,
  TCP_CLOSE_WAIT,
  TCP_LAST_ACK,
  TCP_LISTEN,
  TCP_CLOSING,	 /* now a valid state */

  TCP_MAX_STATES /* Leave at the end! */
};

#define TCP_STATE_MASK	0xF
#define TCP_ACTION_FIN	(1 << 7)

enum {
  TCPF_ESTABLISHED = (1 << 1),
  TCPF_SYN_SENT  = (1 << 2),
  TCPF_SYN_RECV  = (1 << 3),
  TCPF_FIN_WAIT1 = (1 << 4),
  TCPF_FIN_WAIT2 = (1 << 5),
  TCPF_TIME_WAIT = (1 << 6),
  TCPF_CLOSE     = (1 << 7),
  TCPF_CLOSE_WAIT = (1 << 8),
  TCPF_LAST_ACK  = (1 << 9),
  TCPF_LISTEN    = (1 << 10),
  TCPF_CLOSING   = (1 << 11) 
};

/*
 *	The union cast uses a gcc extension to avoid aliasing problems
 *  (union is compatible to any of its members)
 *  This means this part of the code is -fstrict-aliasing safe now.
 */
union tcp_word_hdr { 
	struct tcphdr hdr;
	__u32 		  words[5];
}; 

#define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3]) 

enum { 
	TCP_FLAG_CWR = __constant_htonl(0x00800000), 
	TCP_FLAG_ECE = __constant_htonl(0x00400000), 
	TCP_FLAG_URG = __constant_htonl(0x00200000), 
	TCP_FLAG_ACK = __constant_htonl(0x00100000), 
	TCP_FLAG_PSH = __constant_htonl(0x00080000), 
	TCP_FLAG_RST = __constant_htonl(0x00040000), 
	TCP_FLAG_SYN = __constant_htonl(0x00020000), 
	TCP_FLAG_FIN = __constant_htonl(0x00010000),
	TCP_RESERVED_BITS = __constant_htonl(0x0F000000),
	TCP_DATA_OFFSET = __constant_htonl(0xF0000000)
}; 

/* TCP socket options */
#define TCP_NODELAY		1	/* Turn off Nagle's algorithm. */
#define TCP_MAXSEG		2	/* Limit MSS */
#define TCP_CORK		3	/* Never send partially complete segments */
#define TCP_KEEPIDLE		4	/* Start keeplives after this period */
#define TCP_KEEPINTVL		5	/* Interval between keepalives */
#define TCP_KEEPCNT		6	/* Number of keepalives before death */
#define TCP_SYNCNT		7	/* Number of SYN retransmits */
#define TCP_LINGER2		8	/* Life time of orphaned FIN-WAIT-2 state */
#define TCP_DEFER_ACCEPT	9	/* Wake up listener only when data arrive */
#define TCP_WINDOW_CLAMP	10	/* Bound advertised window */
#define TCP_INFO		11	/* Information about this connection. */
#define TCP_QUICKACK		12	/* Block/reenable quick acks */

#define TCPI_OPT_TIMESTAMPS	1
#define TCPI_OPT_SACK		2
#define TCPI_OPT_WSCALE		4
#define TCPI_OPT_ECN		8

enum tcp_ca_state
{
	TCP_CA_Open = 0,
#define TCPF_CA_Open	(1<<TCP_CA_Open)
	TCP_CA_Disorder = 1,
#define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
	TCP_CA_CWR = 2,
#define TCPF_CA_CWR	(1<<TCP_CA_CWR)
	TCP_CA_Recovery = 3,
#define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
	TCP_CA_Loss = 4
#define TCPF_CA_Loss	(1<<TCP_CA_Loss)
};

struct tcp_info
{
	__u8	tcpi_state;
	__u8	tcpi_ca_state;
	__u8	tcpi_retransmits;
	__u8	tcpi_probes;
	__u8	tcpi_backoff;
	__u8	tcpi_options;
	__u8	tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;

	__u32	tcpi_rto;
	__u32	tcpi_ato;
	__u32	tcpi_snd_mss;
	__u32	tcpi_rcv_mss;

	__u32	tcpi_unacked;
	__u32	tcpi_sacked;
	__u32	tcpi_lost;
	__u32	tcpi_retrans;
	__u32	tcpi_fackets;

	/* Times. */
	__u32	tcpi_last_data_sent;
	__u32	tcpi_last_ack_sent;     /* Not remembered, sorry. */
	__u32	tcpi_last_data_recv;
	__u32	tcpi_last_ack_recv;

	/* Metrics. */
	__u32	tcpi_pmtu;
	__u32	tcpi_rcv_ssthresh;
	__u32	tcpi_rtt;
	__u32	tcpi_rttvar;
	__u32	tcpi_snd_ssthresh;
	__u32	tcpi_snd_cwnd;
	__u32	tcpi_advmss;
	__u32	tcpi_reordering;

	__u32	tcpi_rcv_rtt;
	__u32	tcpi_rcv_space;

	__u32	tcpi_total_retrans;
};

#ifdef __KERNEL__

#include <linux/config.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <net/sock.h>

/* This defines a selective acknowledgement block. */
struct tcp_sack_block {
	__u32	start_seq;
	__u32	end_seq;
};

enum tcp_congestion_algo {
	TCP_RENO=0,
	TCP_VEGAS,
	TCP_WESTWOOD,
	TCP_BIC,
};

struct tcp_options_received {
/*	PAWS/RTTM data	*/
	long	ts_recent_stamp;/* Time we stored ts_recent (for aging) */
	__u32	ts_recent;	/* Time stamp to echo next		*/
	__u32	rcv_tsval;	/* Time stamp value             	*/
	__u32	rcv_tsecr;	/* Time stamp echo reply        	*/
	__u16 	saw_tstamp : 1,	/* Saw TIMESTAMP on last packet		*/
		tstamp_ok : 1,	/* TIMESTAMP seen on SYN packet		*/
		dsack : 1,	/* D-SACK is scheduled			*/
		wscale_ok : 1,	/* Wscale seen on SYN packet		*/
		sack_ok : 4,	/* SACK seen on SYN packet		*/
		snd_wscale : 4,	/* Window scaling received from sender	*/
		rcv_wscale : 4;	/* Window scaling to send to receiver	*/
/*	SACKs data	*/
	__u8	eff_sacks;	/* Size of SACK array to send with next packet */
	__u8	num_sacks;	/* Number of SACK blocks		*/
	__u16	user_mss;  	/* mss requested by user in ioctl */
	__u16	mss_clamp;	/* Maximal mss, negotiated at connection setup */
};

struct tcp_request_sock {
	struct inet_request_sock req;
	__u32			 rcv_isn;
	__u32			 snt_isn;
};

static inline struct tcp_request_sock *tcp_rsk(const struct open_request *req)
{
	return (struct tcp_request_sock *)req;
}

struct tcp_sock {
	/* inet_sock has to be the first member of tcp_sock */
	struct inet_sock	inet;
	int	tcp_header_len;	/* Bytes of tcp header to send		*/

/*
 *	Header prediction flags
 *	0x5?10 << 16 + snd_wnd in net byte order
 */
	__u32	pred_flags;

/*
 *	RFC793 variables by their proper names. This means you can
 *	read the code and the spec side by side (and laugh ...)
 *	See RFC793 and RFC1122. The RFC writes these in capitals.
 */
 	__u32	rcv_nxt;	/* What we want to receive next 	*/
 	__u32	snd_nxt;	/* Next sequence we send		*/

 	__u32	snd_una;	/* First byte we want an ack for	*/
 	__u32	snd_sml;	/* Last byte of the most recently transmitted small packet */
	__u32	rcv_tstamp;	/* timestamp of last received ACK (for keepalives) */
	__u32	lsndtime;	/* timestamp of last sent data packet (for restart window) */
	struct tcp_bind_bucket *bind_hash;
	/* Delayed ACK control data */
	struct {
		__u8	pending;	/* ACK is pending */
		__u8	quick;		/* Scheduled number of quick acks	*/
		__u8	pingpong;	/* The session is interactive		*/
		__u8	blocked;	/* Delayed ACK was blocked by socket lock*/
		__u32	ato;		/* Predicted tick of soft clock		*/
		unsigned long timeout;	/* Currently scheduled timeout		*/
		__u32	lrcvtime;	/* timestamp of last received data packet*/
		__u16	last_seg_size;	/* Size of last incoming segment	*/
		__u16	rcv_mss;	/* MSS used for delayed ACK decisions	*/ 
	} ack;

	/* Data for direct copy to user */
	struct {
		struct sk_buff_head	prequeue;
		struct task_struct	*task;
		struct iovec		*iov;
		int			memory;
		int			len;
	} ucopy;

	__u32	snd_wl1;	/* Sequence for window update		*/
	__u32	snd_wnd;	/* The window we expect to receive	*/
	__u32	max_window;	/* Maximal window ever seen from peer	*/
	__u32	pmtu_cookie;	/* Last pmtu seen by socket		*/
	__u32	mss_cache;	/* Cached effective mss, not including SACKS */
	__u16	mss_cache_std;	/* Like mss_cache, but without TSO */
	__u16	ext_header_len;	/* Network protocol overhead (IP/IPv6 options) */
	__u8	ca_state;	/* State of fast-retransmit machine 	*/
	__u8	retransmits;	/* Number of unrecovered RTO timeouts.	*/

	__u16	advmss;		/* Advertised MSS			*/
	__u32	window_clamp;	/* Maximal window to advertise		*/
	__u32	rcv_ssthresh;	/* Current window clamp			*/

	__u32	frto_highmark;	/* snd_nxt when RTO occurred */
	__u8	reordering;	/* Packet reordering metric.		*/
	__u8	frto_counter;	/* Number of new acks after RTO */

	__u8	adv_cong;	/* Using Vegas, Westwood, or BIC */
	__u8	defer_accept;	/* User waits for some data after accept() */

/* RTT measurement */
	__u32	srtt;		/* smoothed round trip time << 3	*/
	__u32	mdev;		/* medium deviation			*/
	__u32	mdev_max;	/* maximal mdev for the last rtt period	*/
	__u32	rttvar;		/* smoothed mdev_max			*/
	__u32	rtt_seq;	/* sequence number to update rttvar	*/
	__u32	rto;		/* retransmit timeout			*/

	__u32	packets_out;	/* Packets which are "in flight"	*/
	__u32	left_out;	/* Packets which leaved network	*/
	__u32	retrans_out;	/* Retransmitted packets out		*/
	__u8	backoff;	/* backoff				*/
/*
 *      Options received (usually on last packet, some only on SYN packets).
 */
	__u8	nonagle;	/* Disable Nagle algorithm?             */
	__u8	keepalive_probes; /* num of allowed keep alive probes	*/

	__u8	probes_out;	/* unanswered 0 window probes		*/
	struct tcp_options_received rx_opt;

/*
 *	Slow start and congestion control (see also Nagle, and Karn & Partridge)
 */
 	__u32	snd_ssthresh;	/* Slow start size threshold		*/
 	__u32	snd_cwnd;	/* Sending congestion window		*/
 	__u16	snd_cwnd_cnt;	/* Linear increase counter		*/
	__u16	snd_cwnd_clamp; /* Do not allow snd_cwnd to grow above this */
	__u32	snd_cwnd_used;
	__u32	snd_cwnd_stamp;

	/* Two commonly used timers in both sender and receiver paths. */
	unsigned long		timeout;
 	struct timer_list	retransmit_timer;	/* Resend (no ack)	*/
 	struct timer_list	delack_timer;		/* Ack delay 		*/

	struct sk_buff_head	out_of_order_queue; /* Out of order segments go here */

	struct tcp_func		*af_specific;	/* Operations which are AF_INET{4,6} specific	*/

 	__u32	rcv_wnd;	/* Current receiver window		*/
	__u32	rcv_wup;	/* rcv_nxt on last window update sent	*/
	__u32	write_seq;	/* Tail(+1) of data held in tcp send buffer */
	__u32	pushed_seq;	/* Last pushed seq, required to talk to windows */
	__u32	copied_seq;	/* Head of yet unread data		*/

/*	SACKs data	*/
	struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */
	struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/

	__u8	syn_retries;	/* num of allowed syn retries */
	__u8	ecn_flags;	/* ECN status bits.			*/
	__u16	prior_ssthresh; /* ssthresh saved at recovery start	*/
	__u32	lost_out;	/* Lost packets			*/
	__u32	sacked_out;	/* SACK'd packets			*/
	__u32	fackets_out;	/* FACK'd packets			*/
	__u32	high_seq;	/* snd_nxt at onset of congestion	*/

	__u32	retrans_stamp;	/* Timestamp of the last retransmit,
				 * also used in SYN-SENT to remember stamp of
				 * the first SYN. */
	__u32	undo_marker;	/* tracking retrans started here. */
	int	undo_retrans;	/* number of undoable retransmissions. */
	__u32	urg_seq;	/* Seq of received urgent pointer */
	__u16	urg_data;	/* Saved octet of OOB data and control flags */
	__u8	pending;	/* Scheduled timer event	*/
	__u8	urg_mode;	/* In urgent mode		*/
	__u32	snd_up;		/* Urgent pointer		*/

	__u32	total_retrans;	/* Total retransmits for entire connection */

	/* The syn_wait_lock is necessary only to avoid proc interface having
	 * to grab the main lock sock while browsing the listening hash
	 * (otherwise it's deadlock prone).
	 * This lock is acquired in read mode only from listening_get_next()
	 * and it's acquired in write mode _only_ from code that is actively
	 * changing the syn_wait_queue. All readers that are holding
	 * the master sock lock don't need to grab this lock in read mode
	 * too as the syn_wait_queue writes are always protected from
	 * the main sock lock.
	 */
	rwlock_t		syn_wait_lock;
	struct tcp_listen_opt	*listen_opt;

	/* FIFO of established children */
	struct open_request	*accept_queue;
	struct open_request	*accept_queue_tail;

	unsigned int		keepalive_time;	  /* time before keep alive takes place */
	unsigned int		keepalive_intvl;  /* time interval between keep alive probes */
	int			linger2;

	unsigned long last_synq_overflow; 

/* Receiver side RTT estimation */
	struct {
		__u32	rtt;
		__u32	seq;
		__u32	time;
	} rcv_rtt_est;

/* Receiver queue space */
	struct {
		int	space;
		__u32	seq;
		__u32	time;
	} rcvq_space;

/* TCP Westwood structure */
        struct {
                __u32    bw_ns_est;        /* first bandwidth estimation..not too smoothed 8) */
                __u32    bw_est;           /* bandwidth estimate */
                __u32    rtt_win_sx;       /* here starts a new evaluation... */
                __u32    bk;
                __u32    snd_una;          /* used for evaluating the number of acked bytes */
                __u32    cumul_ack;
                __u32    accounted;
                __u32    rtt;
                __u32    rtt_min;          /* minimum observed RTT */
        } westwood;

/* Vegas variables */
	struct {
		__u32	beg_snd_nxt;	/* right edge during last RTT */
		__u32	beg_snd_una;	/* left edge  during last RTT */
		__u32	beg_snd_cwnd;	/* saves the size of the cwnd */
		__u8	doing_vegas_now;/* if true, do vegas for this RTT */
		__u16	cntRTT;		/* # of RTTs measured within last RTT */
		__u32	minRTT;		/* min of RTTs measured within last RTT (in usec) */
		__u32	baseRTT;	/* the min of all Vegas RTT measurements seen (in usec) */
	} vegas;

	/* BI TCP Parameters */
	struct {
		__u32	cnt;		/* increase cwnd by 1 after this number of ACKs */
		__u32 	last_max_cwnd;	/* last maximium snd_cwnd */
		__u32	last_cwnd;	/* the last snd_cwnd */
		__u32   last_stamp;     /* time when updated last_cwnd */
	} bictcp;
};

static inline struct tcp_sock *tcp_sk(const struct sock *sk)
{
	return (struct tcp_sock *)sk;
}

#endif

#endif	/* _LINUX_TCP_H */
Commit	Line	Data
1da177e4 LT	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
	23	struct tcphdr {
	24	__u16 source;
	25	__u16 dest;
	26	__u32 seq;
	27	__u32 ack_seq;
	28	#if defined(__LITTLE_ENDIAN_BITFIELD)
	29	__u16 res1:4,
	30	doff:4,
	31	fin:1,
	32	syn:1,
	33	rst:1,
	34	psh:1,
	35	ack:1,
	36	urg:1,
	37	ece:1,
	38	cwr:1;
	39	#elif defined(__BIG_ENDIAN_BITFIELD)
	40	__u16 doff:4,
	41	res1:4,
	42	cwr:1,
	43	ece:1,
	44	urg:1,
	45	ack:1,
	46	psh:1,
	47	rst:1,
	48	syn:1,
	49	fin:1;
	50	#else
	51	#error "Adjust your <asm/byteorder.h> defines"
	52	#endif
	53	__u16 window;
	54	__u16 check;
	55	__u16 urg_ptr;
	56	};
	57
	58
	59	enum {
	60	TCP_ESTABLISHED = 1,
	61	TCP_SYN_SENT,
	62	TCP_SYN_RECV,
	63	TCP_FIN_WAIT1,
	64	TCP_FIN_WAIT2,
65	TCP_TIME_WAIT,
66	TCP_CLOSE,
67	TCP_CLOSE_WAIT,
68	TCP_LAST_ACK,
69	TCP_LISTEN,
70	TCP_CLOSING, /* now a valid state */
71
72	TCP_MAX_STATES /* Leave at the end! */
73	};
74
75	#define TCP_STATE_MASK 0xF
76	#define TCP_ACTION_FIN (1 << 7)
77
78	enum {
79	TCPF_ESTABLISHED = (1 << 1),
80	TCPF_SYN_SENT = (1 << 2),
81	TCPF_SYN_RECV = (1 << 3),
82	TCPF_FIN_WAIT1 = (1 << 4),
83	TCPF_FIN_WAIT2 = (1 << 5),
84	TCPF_TIME_WAIT = (1 << 6),
85	TCPF_CLOSE = (1 << 7),
86	TCPF_CLOSE_WAIT = (1 << 8),
87	TCPF_LAST_ACK = (1 << 9),
88	TCPF_LISTEN = (1 << 10),
89	TCPF_CLOSING = (1 << 11)
90	};
91
92	/*
93	* The union cast uses a gcc extension to avoid aliasing problems
94	* (union is compatible to any of its members)
95	* This means this part of the code is -fstrict-aliasing safe now.
96	*/
97	union tcp_word_hdr {
98	struct tcphdr hdr;
99	__u32 words[5];
100	};
101
102	#define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3])
103
104	enum {
105	TCP_FLAG_CWR = __constant_htonl(0x00800000),
106	TCP_FLAG_ECE = __constant_htonl(0x00400000),
107	TCP_FLAG_URG = __constant_htonl(0x00200000),
108	TCP_FLAG_ACK = __constant_htonl(0x00100000),
109	TCP_FLAG_PSH = __constant_htonl(0x00080000),
110	TCP_FLAG_RST = __constant_htonl(0x00040000),
111	TCP_FLAG_SYN = __constant_htonl(0x00020000),
112	TCP_FLAG_FIN = __constant_htonl(0x00010000),
113	TCP_RESERVED_BITS = __constant_htonl(0x0F000000),
114	TCP_DATA_OFFSET = __constant_htonl(0xF0000000)
115	};
116
117	/* TCP socket options */
118	#define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */
119	#define TCP_MAXSEG 2 /* Limit MSS */
120	#define TCP_CORK 3 /* Never send partially complete segments */
121	#define TCP_KEEPIDLE 4 /* Start keeplives after this period */
122	#define TCP_KEEPINTVL 5 /* Interval between keepalives */
123	#define TCP_KEEPCNT 6 /* Number of keepalives before death */
124	#define TCP_SYNCNT 7 /* Number of SYN retransmits */
125	#define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */
126	#define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */
127	#define TCP_WINDOW_CLAMP 10 /* Bound advertised window */
128	#define TCP_INFO 11 /* Information about this connection. */
129	#define TCP_QUICKACK 12 /* Block/reenable quick acks */
130
131	#define TCPI_OPT_TIMESTAMPS 1
132	#define TCPI_OPT_SACK 2
133	#define TCPI_OPT_WSCALE 4
134	#define TCPI_OPT_ECN 8
135
136	enum tcp_ca_state
137	{
138	TCP_CA_Open = 0,
139	#define TCPF_CA_Open (1<<TCP_CA_Open)
140	TCP_CA_Disorder = 1,
141	#define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
142	TCP_CA_CWR = 2,
143	#define TCPF_CA_CWR (1<<TCP_CA_CWR)
144	TCP_CA_Recovery = 3,
145	#define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
146	TCP_CA_Loss = 4
147	#define TCPF_CA_Loss (1<<TCP_CA_Loss)
148	};
149
150	struct tcp_info
151	{
152	__u8 tcpi_state;
153	__u8 tcpi_ca_state;
154	__u8 tcpi_retransmits;
155	__u8 tcpi_probes;
156	__u8 tcpi_backoff;
157	__u8 tcpi_options;
158	__u8 tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
159
160	__u32 tcpi_rto;
161	__u32 tcpi_ato;
162	__u32 tcpi_snd_mss;
163	__u32 tcpi_rcv_mss;
164
165	__u32 tcpi_unacked;
166	__u32 tcpi_sacked;
167	__u32 tcpi_lost;
168	__u32 tcpi_retrans;
169	__u32 tcpi_fackets;
170
171	/* Times. */
172	__u32 tcpi_last_data_sent;
173	__u32 tcpi_last_ack_sent; /* Not remembered, sorry. */
174	__u32 tcpi_last_data_recv;
175	__u32 tcpi_last_ack_recv;
176
177	/* Metrics. */
178	__u32 tcpi_pmtu;
179	__u32 tcpi_rcv_ssthresh;
180	__u32 tcpi_rtt;
181	__u32 tcpi_rttvar;
182	__u32 tcpi_snd_ssthresh;
183	__u32 tcpi_snd_cwnd;
184	__u32 tcpi_advmss;
185	__u32 tcpi_reordering;
186
187	__u32 tcpi_rcv_rtt;
188	__u32 tcpi_rcv_space;
189
190	__u32 tcpi_total_retrans;
191	};
192
193	#ifdef __KERNEL__
194
195	#include <linux/config.h>
196	#include <linux/skbuff.h>
197	#include <linux/ip.h>
198	#include <net/sock.h>
199
200	/* This defines a selective acknowledgement block. */
201	struct tcp_sack_block {
202	__u32 start_seq;
203	__u32 end_seq;
204	};
205
206	enum tcp_congestion_algo {
207	TCP_RENO=0,
208	TCP_VEGAS,
209	TCP_WESTWOOD,
210	TCP_BIC,
211	};
212
213	struct tcp_options_received {
214	/* PAWS/RTTM data */
215	long ts_recent_stamp;/* Time we stored ts_recent (for aging) */
216	__u32 ts_recent; /* Time stamp to echo next */
217	__u32 rcv_tsval; /* Time stamp value */
218	__u32 rcv_tsecr; /* Time stamp echo reply */
219	__u16 saw_tstamp : 1, /* Saw TIMESTAMP on last packet */
220	tstamp_ok : 1, /* TIMESTAMP seen on SYN packet */
221	dsack : 1, /* D-SACK is scheduled */
222	wscale_ok : 1, /* Wscale seen on SYN packet */
223	sack_ok : 4, /* SACK seen on SYN packet */
224	snd_wscale : 4, /* Window scaling received from sender */
225	rcv_wscale : 4; /* Window scaling to send to receiver */
226	/* SACKs data */
227	__u8 eff_sacks; /* Size of SACK array to send with next packet */
228	__u8 num_sacks; /* Number of SACK blocks */
229	__u16 user_mss; /* mss requested by user in ioctl */
230	__u16 mss_clamp; /* Maximal mss, negotiated at connection setup */
231	};
232
2e6599cb ACM	233	struct tcp_request_sock {
	234	struct inet_request_sock req;
	235	__u32 rcv_isn;
	236	__u32 snt_isn;
	237	};
	238
	239	static inline struct tcp_request_sock tcp_rsk(const struct open_request req)
	240	{
	241	return (struct tcp_request_sock *)req;
	242	}
	243
1da177e4 LT	244	struct tcp_sock {
	245	/* inet_sock has to be the first member of tcp_sock */
	246	struct inet_sock inet;
	247	int tcp_header_len; /* Bytes of tcp header to send */
	248
	249	/*
	250	* Header prediction flags
	251	* 0x5?10 << 16 + snd_wnd in net byte order
	252	*/
	253	__u32 pred_flags;
	254
	255	/*
	256	* RFC793 variables by their proper names. This means you can
	257	* read the code and the spec side by side (and laugh ...)
	258	* See RFC793 and RFC1122. The RFC writes these in capitals.
	259	*/
	260	__u32 rcv_nxt; /* What we want to receive next */
	261	__u32 snd_nxt; /* Next sequence we send */
	262
	263	__u32 snd_una; /* First byte we want an ack for */
	264	__u32 snd_sml; /* Last byte of the most recently transmitted small packet */
	265	__u32 rcv_tstamp; /* timestamp of last received ACK (for keepalives) */
	266	__u32 lsndtime; /* timestamp of last sent data packet (for restart window) */
	267	struct tcp_bind_bucket *bind_hash;
	268	/* Delayed ACK control data */
	269	struct {
	270	__u8 pending; /* ACK is pending */
	271	__u8 quick; /* Scheduled number of quick acks */
	272	__u8 pingpong; /* The session is interactive */
	273	__u8 blocked; /* Delayed ACK was blocked by socket lock*/
	274	__u32 ato; /* Predicted tick of soft clock */
	275	unsigned long timeout; /* Currently scheduled timeout */
	276	__u32 lrcvtime; /* timestamp of last received data packet*/
	277	__u16 last_seg_size; /* Size of last incoming segment */
	278	__u16 rcv_mss; /* MSS used for delayed ACK decisions */
	279	} ack;
	280
	281	/* Data for direct copy to user */
	282	struct {
	283	struct sk_buff_head prequeue;
	284	struct task_struct *task;
	285	struct iovec *iov;
	286	int memory;
	287	int len;
	288	} ucopy;
	289
	290	__u32 snd_wl1; /* Sequence for window update */
	291	__u32 snd_wnd; /* The window we expect to receive */
	292	__u32 max_window; /* Maximal window ever seen from peer */
	293	__u32 pmtu_cookie; /* Last pmtu seen by socket */
	294	__u32 mss_cache; /* Cached effective mss, not including SACKS */
	295	__u16 mss_cache_std; /* Like mss_cache, but without TSO */
	296	__u16 ext_header_len; /* Network protocol overhead (IP/IPv6 options) */
	297	__u8 ca_state; /* State of fast-retransmit machine */
	298	__u8 retransmits; /* Number of unrecovered RTO timeouts. */
	299
	300	__u16 advmss; /* Advertised MSS */
	301	__u32 window_clamp; /* Maximal window to advertise */
	302	__u32 rcv_ssthresh; /* Current window clamp */
	303
	304	__u32 frto_highmark; /* snd_nxt when RTO occurred */
	305	__u8 reordering; /* Packet reordering metric. */
	306	__u8 frto_counter; /* Number of new acks after RTO */
	307
308	__u8 adv_cong; /* Using Vegas, Westwood, or BIC */
309	__u8 defer_accept; /* User waits for some data after accept() */
310
311	/* RTT measurement */
312	__u32 srtt; /* smoothed round trip time << 3 */
313	__u32 mdev; /* medium deviation */
314	__u32 mdev_max; /* maximal mdev for the last rtt period */
315	__u32 rttvar; /* smoothed mdev_max */
316	__u32 rtt_seq; /* sequence number to update rttvar */
317	__u32 rto; /* retransmit timeout */
318
319	__u32 packets_out; /* Packets which are "in flight" */
320	__u32 left_out; /* Packets which leaved network */
321	__u32 retrans_out; /* Retransmitted packets out */
322	__u8 backoff; /* backoff */
323	/*
324	* Options received (usually on last packet, some only on SYN packets).
325	*/
326	__u8 nonagle; /* Disable Nagle algorithm? */
327	__u8 keepalive_probes; /* num of allowed keep alive probes */
328
329	__u8 probes_out; /* unanswered 0 window probes */
330	struct tcp_options_received rx_opt;
331
332	/*
333	* Slow start and congestion control (see also Nagle, and Karn & Partridge)
334	*/
335	__u32 snd_ssthresh; /* Slow start size threshold */
336	__u32 snd_cwnd; /* Sending congestion window */
337	__u16 snd_cwnd_cnt; /* Linear increase counter */
338	__u16 snd_cwnd_clamp; /* Do not allow snd_cwnd to grow above this */
339	__u32 snd_cwnd_used;
340	__u32 snd_cwnd_stamp;
341
342	/* Two commonly used timers in both sender and receiver paths. */
343	unsigned long timeout;
344	struct timer_list retransmit_timer; /* Resend (no ack) */
345	struct timer_list delack_timer; /* Ack delay */
346
347	struct sk_buff_head out_of_order_queue; /* Out of order segments go here */
348
349	struct tcp_func af_specific; / Operations which are AF_INET{4,6} specific */
350
351	__u32 rcv_wnd; /* Current receiver window */
352	__u32 rcv_wup; /* rcv_nxt on last window update sent */
353	__u32 write_seq; /* Tail(+1) of data held in tcp send buffer */
354	__u32 pushed_seq; /* Last pushed seq, required to talk to windows */
355	__u32 copied_seq; /* Head of yet unread data */
356
357	/* SACKs data */
358	struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */
359	struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/
360
361	__u8 syn_retries; /* num of allowed syn retries */
362	__u8 ecn_flags; /* ECN status bits. */
363	__u16 prior_ssthresh; /* ssthresh saved at recovery start */
364	__u32 lost_out; /* Lost packets */
365	__u32 sacked_out; /* SACK'd packets */
366	__u32 fackets_out; /* FACK'd packets */
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; /* tracking retrans started here. */
373	int undo_retrans; /* number of undoable retransmissions. */
374	__u32 urg_seq; /* Seq of received urgent pointer */
375	__u16 urg_data; /* Saved octet of OOB data and control flags */
376	__u8 pending; /* Scheduled timer event */
377	__u8 urg_mode; /* In urgent mode */
378	__u32 snd_up; /* Urgent pointer */
379
380	__u32 total_retrans; /* Total retransmits for entire connection */
381
382	/* The syn_wait_lock is necessary only to avoid proc interface having
383	* to grab the main lock sock while browsing the listening hash
384	* (otherwise it's deadlock prone).
385	* This lock is acquired in read mode only from listening_get_next()
386	* and it's acquired in write mode _only_ from code that is actively
387	* changing the syn_wait_queue. All readers that are holding
388	* the master sock lock don't need to grab this lock in read mode
389	* too as the syn_wait_queue writes are always protected from
390	* the main sock lock.
391	*/
392	rwlock_t syn_wait_lock;
393	struct tcp_listen_opt *listen_opt;
394
395	/* FIFO of established children */
396	struct open_request *accept_queue;
397	struct open_request *accept_queue_tail;
398
399	unsigned int keepalive_time; /* time before keep alive takes place */
400	unsigned int keepalive_intvl; /* time interval between keep alive probes */
401	int linger2;
402
403	unsigned long last_synq_overflow;
404
405	/* Receiver side RTT estimation */
406	struct {
407	__u32 rtt;
408	__u32 seq;
409	__u32 time;
410	} rcv_rtt_est;
411
412	/* Receiver queue space */
413	struct {
414	int space;
415	__u32 seq;
416	__u32 time;
417	} rcvq_space;
418
419	/* TCP Westwood structure */
420	struct {
421	__u32 bw_ns_est; /* first bandwidth estimation..not too smoothed 8) */
422	__u32 bw_est; /* bandwidth estimate */
423	__u32 rtt_win_sx; /* here starts a new evaluation... */
424	__u32 bk;
425	__u32 snd_una; /* used for evaluating the number of acked bytes */
426	__u32 cumul_ack;
427	__u32 accounted;
428	__u32 rtt;
429	__u32 rtt_min; /* minimum observed RTT */
430	} westwood;
431
432	/* Vegas variables */
433	struct {
434	__u32 beg_snd_nxt; /* right edge during last RTT */
435	__u32 beg_snd_una; /* left edge during last RTT */
436	__u32 beg_snd_cwnd; /* saves the size of the cwnd */
437	__u8 doing_vegas_now;/* if true, do vegas for this RTT */
438	__u16 cntRTT; /* # of RTTs measured within last RTT */
439	__u32 minRTT; /* min of RTTs measured within last RTT (in usec) */
440	__u32 baseRTT; /* the min of all Vegas RTT measurements seen (in usec) */
441	} vegas;
442
443	/* BI TCP Parameters */
444	struct {
445	__u32 cnt; /* increase cwnd by 1 after this number of ACKs */
446	__u32 last_max_cwnd; /* last maximium snd_cwnd */
447	__u32 last_cwnd; /* the last snd_cwnd */
448	__u32 last_stamp; /* time when updated last_cwnd */
449	} bictcp;
450	};
451
452	static inline struct tcp_sock tcp_sk(const struct sock sk)
453	{
454	return (struct tcp_sock *)sk;
455	}
456
457	#endif
458
459	#endif /* _LINUX_TCP_H */