xref: /illumos-gate/usr/src/uts/common/netinet/tcp.h (revision 861fa149)
17c478bd9Sstevel@tonic-gate /*
2707e74bcSKacheong Poon  * CDDL HEADER START
3707e74bcSKacheong Poon  *
4707e74bcSKacheong Poon  * The contents of this file are subject to the terms of the
5707e74bcSKacheong Poon  * Common Development and Distribution License (the "License").
6707e74bcSKacheong Poon  * You may not use this file except in compliance with the License.
7707e74bcSKacheong Poon  *
8707e74bcSKacheong Poon  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9707e74bcSKacheong Poon  * or http://www.opensolaris.org/os/licensing.
10707e74bcSKacheong Poon  * See the License for the specific language governing permissions
11707e74bcSKacheong Poon  * and limitations under the License.
12707e74bcSKacheong Poon  *
13707e74bcSKacheong Poon  * When distributing Covered Code, include this CDDL HEADER in each
14707e74bcSKacheong Poon  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15707e74bcSKacheong Poon  * If applicable, add the following below this CDDL HEADER, with the
16707e74bcSKacheong Poon  * fields enclosed by brackets "[]" replaced with your own identifying
17707e74bcSKacheong Poon  * information: Portions Copyright [yyyy] [name of copyright owner]
18707e74bcSKacheong Poon  *
19707e74bcSKacheong Poon  * CDDL HEADER END
20707e74bcSKacheong Poon  */
21707e74bcSKacheong Poon 
22707e74bcSKacheong Poon /*
23707e74bcSKacheong Poon  * Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved.
243d0a255cSGarrett D'Amore  * Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved.
25*861fa149SNils Nieuwejaar  * Copyright 2022 Oxide Computer Company
267c478bd9Sstevel@tonic-gate  */
287c478bd9Sstevel@tonic-gate /*
297c478bd9Sstevel@tonic-gate  * Copyright (c) 1982, 1986 Regents of the University of California.
307c478bd9Sstevel@tonic-gate  * All rights reserved.  The Berkeley software License Agreement
317c478bd9Sstevel@tonic-gate  * specifies the terms and conditions for redistribution.
327c478bd9Sstevel@tonic-gate  */
347c478bd9Sstevel@tonic-gate #ifndef	_NETINET_TCP_H
357c478bd9Sstevel@tonic-gate #define	_NETINET_TCP_H
377c478bd9Sstevel@tonic-gate /* tcp.h 1.11 88/08/19 SMI; from UCB 7.2 10/28/86	*/
407c478bd9Sstevel@tonic-gate #include <sys/isa_defs.h>
417c478bd9Sstevel@tonic-gate #include <sys/inttypes.h>
437c478bd9Sstevel@tonic-gate #ifdef	__cplusplus
447c478bd9Sstevel@tonic-gate extern "C" {
457c478bd9Sstevel@tonic-gate #endif
477c478bd9Sstevel@tonic-gate typedef	uint32_t	tcp_seq;
487c478bd9Sstevel@tonic-gate /*
497c478bd9Sstevel@tonic-gate  * TCP header.
507c478bd9Sstevel@tonic-gate  * Per RFC 793, September, 1981.
517c478bd9Sstevel@tonic-gate  */
527c478bd9Sstevel@tonic-gate struct tcphdr {
537c478bd9Sstevel@tonic-gate 	uint16_t	th_sport;	/* source port */
547c478bd9Sstevel@tonic-gate 	uint16_t	th_dport;	/* destination port */
557c478bd9Sstevel@tonic-gate 	tcp_seq		th_seq;		/* sequence number */
567c478bd9Sstevel@tonic-gate 	tcp_seq		th_ack;		/* acknowledgement number */
577c478bd9Sstevel@tonic-gate #ifdef _BIT_FIELDS_LTOH
587c478bd9Sstevel@tonic-gate 	uint_t	th_x2:4,		/* (unused) */
597c478bd9Sstevel@tonic-gate 		th_off:4;		/* data offset */
607c478bd9Sstevel@tonic-gate #else
617c478bd9Sstevel@tonic-gate 	uint_t	th_off:4,		/* data offset */
627c478bd9Sstevel@tonic-gate 		th_x2:4;		/* (unused) */
637c478bd9Sstevel@tonic-gate #endif
647c478bd9Sstevel@tonic-gate 	uchar_t	th_flags;
657c478bd9Sstevel@tonic-gate #define	TH_FIN	0x01
667c478bd9Sstevel@tonic-gate #define	TH_SYN	0x02
677c478bd9Sstevel@tonic-gate #define	TH_RST	0x04
687c478bd9Sstevel@tonic-gate #define	TH_PUSH	0x08
697c478bd9Sstevel@tonic-gate #define	TH_ACK	0x10
707c478bd9Sstevel@tonic-gate #define	TH_URG	0x20
717c478bd9Sstevel@tonic-gate #define	TH_ECE	0x40
727c478bd9Sstevel@tonic-gate #define	TH_CWR	0x80
737c478bd9Sstevel@tonic-gate 	uint16_t	th_win;		/* window */
747c478bd9Sstevel@tonic-gate 	uint16_t	th_sum;		/* checksum */
757c478bd9Sstevel@tonic-gate 	uint16_t	th_urp;		/* urgent pointer */
767c478bd9Sstevel@tonic-gate };
787c478bd9Sstevel@tonic-gate #define	TCPOPT_EOL	0
797c478bd9Sstevel@tonic-gate #define	TCPOPT_NOP	1
807c478bd9Sstevel@tonic-gate #define	TCPOPT_MAXSEG	2
817c478bd9Sstevel@tonic-gate #define	TCPOPT_WSCALE	3
827c478bd9Sstevel@tonic-gate #define	TCPOPT_SACK_PERMITTED	4
837c478bd9Sstevel@tonic-gate #define	TCPOPT_SACK	5
847c478bd9Sstevel@tonic-gate #define	TCPOPT_TSTAMP	8
867c478bd9Sstevel@tonic-gate /*
877c478bd9Sstevel@tonic-gate  * Default maximum segment size for TCP.
887c478bd9Sstevel@tonic-gate  * With an IP MTU of 576, this is 536.
897c478bd9Sstevel@tonic-gate  */
907c478bd9Sstevel@tonic-gate #define	TCP_MSS	536
927c478bd9Sstevel@tonic-gate /*
937c478bd9Sstevel@tonic-gate  * Options for use with [gs]etsockopt at the TCP level.
947c478bd9Sstevel@tonic-gate  *
957c478bd9Sstevel@tonic-gate  * Note: Some of the TCP_ namespace has conflict with and
967c478bd9Sstevel@tonic-gate  * and is exposed through <xti.h>. (It also requires exposing
977c478bd9Sstevel@tonic-gate  * options not implemented). The options with potential
987c478bd9Sstevel@tonic-gate  * for conflicts use #ifndef guards.
997c478bd9Sstevel@tonic-gate  */
1007c478bd9Sstevel@tonic-gate #ifndef TCP_NODELAY
1017c478bd9Sstevel@tonic-gate #define	TCP_NODELAY	0x01	/* don't delay send to coalesce packets */
1027c478bd9Sstevel@tonic-gate #endif
1047c478bd9Sstevel@tonic-gate #ifndef TCP_MAXSEG
1057c478bd9Sstevel@tonic-gate #define	TCP_MAXSEG	0x02	/* set maximum segment size */
1067c478bd9Sstevel@tonic-gate #endif
1087c478bd9Sstevel@tonic-gate #ifndef TCP_KEEPALIVE
1097c478bd9Sstevel@tonic-gate #define	TCP_KEEPALIVE	0x8	/* set keepalive timer */
1107c478bd9Sstevel@tonic-gate #endif
1137c478bd9Sstevel@tonic-gate #define	TCP_NOTIFY_THRESHOLD		0x10
1147c478bd9Sstevel@tonic-gate #define	TCP_ABORT_THRESHOLD		0x11
1157c478bd9Sstevel@tonic-gate #define	TCP_CONN_NOTIFY_THRESHOLD	0x12
1167c478bd9Sstevel@tonic-gate #define	TCP_CONN_ABORT_THRESHOLD	0x13
1177c478bd9Sstevel@tonic-gate #define	TCP_RECVDSTADDR			0x14
1187c478bd9Sstevel@tonic-gate #define	TCP_INIT_CWND			0x15
1197c478bd9Sstevel@tonic-gate #define	TCP_KEEPALIVE_THRESHOLD		0x16
1207c478bd9Sstevel@tonic-gate #define	TCP_KEEPALIVE_ABORT_THRESHOLD	0x17
1217c478bd9Sstevel@tonic-gate #define	TCP_CORK			0x18
122707e74bcSKacheong Poon #define	TCP_RTO_INITIAL			0x19
123707e74bcSKacheong Poon #define	TCP_RTO_MIN			0x1A
124707e74bcSKacheong Poon #define	TCP_RTO_MAX			0x1B
125707e74bcSKacheong Poon #define	TCP_LINGER2			0x1C
1277c478bd9Sstevel@tonic-gate /* gap for expansion of ``standard'' options */
1287c478bd9Sstevel@tonic-gate #define	TCP_ANONPRIVBIND		0x20	/* for internal use only  */
1297c478bd9Sstevel@tonic-gate #define	TCP_EXCLBIND			0x21	/* for internal use only  */
1303d0a255cSGarrett D'Amore #define	TCP_KEEPIDLE			0x22
1313d0a255cSGarrett D'Amore #define	TCP_KEEPCNT			0x23
1323d0a255cSGarrett D'Amore #define	TCP_KEEPINTVL			0x24
133d4994511SCody Peter Mello #define	TCP_CONGESTION			0x25
134*861fa149SNils Nieuwejaar #define	TCP_QUICKACK			0x26	/* enable/disable quick acks */
1367c478bd9Sstevel@tonic-gate #ifdef	__cplusplus
1377c478bd9Sstevel@tonic-gate }
1387c478bd9Sstevel@tonic-gate #endif
1407c478bd9Sstevel@tonic-gate #endif	/* _NETINET_TCP_H */