/* * 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)	__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)	__u16	doff:4,		res1:4,		cwr:1,		ece:1,		urg:1,		ack:1,		psh:1,		rst:1,		syn:1,		fin:1;#else#error	"Endian problem - this didn't happen"#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		8enum 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;};#endif	/* _LINUX_TCP_H */