/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved.

 */

/*

 * Copyright (c) 1982, 1986 Regents of the University of California.

 * All rights reserved.  The Berkeley software License Agreement

 * specifies the terms and conditions for redistribution.

 */

#ifndef	_NETINET_TCP_H

#define	_NETINET_TCP_H

/* tcp.h 1.11 88/08/19 SMI; from UCB 7.2 10/28/86	*/

#include <sys/isa_defs.h>

#include <sys/inttypes.h>

#ifdef	__cplusplus

extern "C" {

#endif

typedef	uint32_t	tcp_seq;

/*

 * TCP header.

 * Per RFC 793, September, 1981.

 */

struct tcphdr {

	uint16_t	th_sport;	/* source port */

	uint16_t	th_dport;	/* destination port */

	tcp_seq		th_seq;		/* sequence number */

	tcp_seq		th_ack;		/* acknowledgement number */

#ifdef _BIT_FIELDS_LTOH

	uint_t	th_x2:4,		/* (unused) */

		th_off:4;		/* data offset */

#else

	uint_t	th_off:4,		/* data offset */

		th_x2:4;		/* (unused) */

#endif

	uchar_t	th_flags;

#define	TH_FIN	0x01

#define	TH_SYN	0x02

#define	TH_RST	0x04

#define	TH_PUSH	0x08

#define	TH_ACK	0x10

#define	TH_URG	0x20

#define	TH_ECE	0x40

#define	TH_CWR	0x80

	uint16_t	th_win;		/* window */

	uint16_t	th_sum;		/* checksum */

	uint16_t	th_urp;		/* urgent pointer */

};

#define	TCPOPT_EOL	0

#define	TCPOPT_NOP	1

#define	TCPOPT_MAXSEG	2

#define	TCPOPT_WSCALE	3

#define	TCPOPT_SACK_PERMITTED	4

#define	TCPOPT_SACK	5

#define	TCPOPT_TSTAMP	8

/*

 * Default maximum segment size for TCP.

 * With an IP MTU of 576, this is 536.

 */

#define	TCP_MSS	536

/*

 * Options for use with [gs]etsockopt at the TCP level.

 *

 * Note: Some of the TCP_ namespace has conflict with and

 * and is exposed through <xti.h>. (It also requires exposing

 * options not implemented). The options with potential

 * for conflicts use #ifndef guards.

 */

#ifndef TCP_NODELAY

#define	TCP_NODELAY	0x01	/* don't delay send to coalesce packets */

#endif

#ifndef TCP_MAXSEG

#define	TCP_MAXSEG	0x02	/* set maximum segment size */

#endif

#ifndef TCP_KEEPALIVE

#define	TCP_KEEPALIVE	0x8	/* set keepalive timer */

#endif

#define	TCP_NOTIFY_THRESHOLD		0x10

#define	TCP_ABORT_THRESHOLD		0x11

#define	TCP_CONN_NOTIFY_THRESHOLD	0x12

#define	TCP_CONN_ABORT_THRESHOLD	0x13

#define	TCP_RECVDSTADDR			0x14

#define	TCP_INIT_CWND			0x15

#define	TCP_KEEPALIVE_THRESHOLD		0x16

#define	TCP_KEEPALIVE_ABORT_THRESHOLD	0x17

#define	TCP_CORK			0x18

#define	TCP_RTO_INITIAL			0x19

#define	TCP_RTO_MIN			0x1A

#define	TCP_RTO_MAX			0x1B

#define	TCP_LINGER2			0x1C

/* gap for expansion of ``standard'' options */

#define	TCP_ANONPRIVBIND		0x20	/* for internal use only  */

#define	TCP_EXCLBIND			0x21	/* for internal use only  */

#ifdef	__cplusplus

}

#endif

#endif	/* _NETINET_TCP_H */