/*
 * Copyright (c) 2011 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup tcp
 * @{
 */
/** @file TCP header definitions
 *
 * Based on IETF RFC 793
 */

#ifndef STD_H
#define STD_H

#include <sys/types.h>

/** TCP Header (fixed part) */
typedef struct {
	/** Source port */
	uint16_t src_port;
	/** Destination port */
	uint16_t dest_port;
	/** Sequence number */
	uint32_t seq;
	/** Acknowledgement number */
	uint32_t ack;
	/** Data Offset, Reserved, Flags */
	uint16_t doff_flags;
	/** Window */
	uint16_t window;
	/* Checksum */
	uint16_t checksum;
	/** Urgent pointer */
	uint16_t urg_ptr;
} tcp_header_t;

/** Bits in tcp_header_t.doff_flags */
enum doff_flags_bits {
	DF_DATA_OFFSET_h	= 15,
	DF_DATA_OFFSET_l	= 12,
	DF_URG			= 5,
	DF_ACK			= 4,
	DF_PSH			= 3,
	DF_RST			= 2,
	DF_SYN			= 1,
	DF_FIN			= 0
};

/** TCP pseudo header */
typedef struct {
	/** Source address */
	uint32_t src_addr;
	/** Destination address */
	uint32_t dest_addr;
	/** Zero */
	uint8_t zero;
	/** Protocol */
	uint8_t protocol;
	/** TCP length */
	uint16_t tcp_length;
} tcp_phdr_t;

/** Option kind */
enum opt_kind {
	/** End of option list */
	OPT_END_LIST		= 0,
	/** No-operation */
	OPT_NOP			= 1,
	/** Maximum segment size */
	OPT_MAX_SEG_SIZE	= 2
};

#endif

/** @}
 */