Initial revision

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;
-};
-
-#endif	/* _LINUX_TCP_H */