WebSVN – HelenOS – Blame – /branches/network/uspace/srv/net/tl/tcp/tcp_header.h

Rev	Author	Line No.	Line
4727	mejdrech	1	/*
		2	* Copyright (c) 2009 Lukas Mejdrech
		3	* All rights reserved.
		4	*
		5	* Redistribution and use in source and binary forms, with or without
		6	* modification, are permitted provided that the following conditions
		7	* are met:
		8	*
		9	* - Redistributions of source code must retain the above copyright
		10	* notice, this list of conditions and the following disclaimer.
		11	* - Redistributions in binary form must reproduce the above copyright
		12	* notice, this list of conditions and the following disclaimer in the
		13	* documentation and/or other materials provided with the distribution.
		14	* - The name of the author may not be used to endorse or promote products
		15	* derived from this software without specific prior written permission.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
		18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
		19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
		20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
		21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
		22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
		26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		27	*/
		28
		29	/** @addtogroup tcp
		30	* @{
		31	*/
		32
		33	/** @file
		34	* TCP header definition.
		35	* Names according to the linux src/include/linux/tcp.h header file.
		36	*/
		37
		38	#ifndef __NET_TCP_HEADER_H__
		39	#define __NET_TCP_HEADER_H__
		40
		41	#include <sys/types.h>
		42
		43	/** Type definition of the transmission datagram header.
		44	* @see tcp_header
		45	*/
		46	typedef struct tcp_header tcp_header_t;
		47
		48	/** Type definition of the transmission datagram header pointer.
		49	* @see tcp_header
		50	*/
		51	typedef tcp_header_t * tcp_header_ref;
		52
		53	/** Transmission datagram header.
		54	*/
		55	struct tcp_header{
		56	/** The 16-bit source port number, used by the receiver to reply.
		57	*/
		58	uint16_t source;
		59	/** The 16-bit destination port number.
		60	*/
		61	uint16_t dest;
		62	/** The sequence number of the first data byte in this segment.
		63	* If the SYN control bit is set, the sequence number is the initial sequence number (n) and the first data byte is n+1.
		64	*/
		65	uint32_t seq;
		66	/** If the ACK control bit is set, this field contains the value of the next sequence number that the receiver is expecting to receive.
		67	*/
		68	uint32_t ack_seq;
		69	#ifdef ARCH_IS_BIG_ENDIAN
		70	/** The number of 32-bit words in the TCP header.
		71	* It indicates where the data begins.
		72	*/
		73	uint8_t doff:4;
		74	/** Four bits reserved for future use.
		75	* Must be zero.
		76	*/
		77	uint8_t res1:4;
		78	#else
		79	/** Four bits reserved for future use.
		80	* Must be zero.
		81	*/
		82	uint8_t res1:4;
		83	/** The number of 32-bit words in the TCP header.
		84	* It indicates where the data begins.
		85	*/
		86	uint8_t doff:4;
		87	#endif
		88	#ifdef ARCH_IS_BIG_ENDIAN
		89	/** Two bits reserved for future use.
		90	* Must be zero.
		91	*/
		92	uint8_t res2:2;
		93	/** Indicates that the urgent pointer field is significant in this segment.
		94	*/
		95	uint8_t urg:1;
		96	/** Indicates that the acknowledgment field is significant in this segment.
		97	*/
		98	uint8_t ack:1;
		99	/** Push function.
		100	*/
		101	uint8_t psh:1;
		102	/** Resets the connection.
		103	*/
		104	uint8_t rst:1;
		105	/** Synchronizes the sequence numbers.
		106	*/
		107	uint8_t syn:1;
		108	/** No more data from sender.
		109	*/
		110	uint8_t fin:1;
		111	#else
		112	/** No more data from sender.
		113	*/
		114	uint8_t fin:1;
		115	/** Synchronizes the sequence numbers.
		116	*/
		117	uint8_t syn:1;
		118	/** Resets the connection.
		119	*/
		120	uint8_t rst:1;
		121	/** Push function.
		122	*/
		123	uint8_t psh:1;
		124	/** Indicates that the acknowledgment field is significant in this segment.
		125	*/
		126	uint8_t ack:1;
		127	/** Indicates that the urgent pointer field is significant in this segment.
		128	*/
		129	uint8_t urg:1;
		130	/** Two bits reserved for future use.
		131	* Must be zero.
		132	*/
		133	uint8_t res2:2;
		134	#endif
		135	/** Used in ACK segments.
		136	* It specifies the number of data bytes, beginning with the one indicated in the acknowledgment number field that the receiver (the sender of this segment) is willing to accept.
		137	*/
		138	uint16_t window;
		139	/** The 16-bit one's complement of the one's complement sum of all 16-bit words in a pseudo-header, the TCP header, and the TCP data.
		140	* While computing the checksum, the checksum field itself is considered zero.
		141	* The pseudo header conceptually prefixed to the TCP header contains the source address, the destination address, the protocol, and the TCP length.
		142	* This information gives protection against misrouted datagrams.
		143	* If the computed checksum is zero, it is transmitted as all ones (the equivalent in one's complement arithmetic).
		144	*/
		145	uint16_t check;
		146	/** Points to the first data octet following the urgent data.
		147	* Only significant when the URG control bit is set.
		148	*/
		149	uint16_t urg_ptr;
		150	} __attribute__ ((packed));
		151
		152	#endif
		153
		154	/** @}
		155	*/

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