/*
 * Copyright (C) 2015 Simon Brummer
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */

/**
 * @defgroup    net_gnrc_tcp TCP
 * @ingroup     net_gnrc
 * @brief       RIOT's tcp implementation for the gnrc stack
 *
 * @{
 *
 * @file
 * @brief      TCP Header
 *
 * @author     Simon Brummer <brummer.simon@googlemail.com>
 */

#ifndef GNRC_TCP_HDR_H_
#define GNRC_TCP_HDR_H_

#include "byteorder.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @brief TCP Options could contain up to 10 32-Bit values of Information.
 */
#define TCP_MAX_HDR_OPTIONS 10

/**
 * @brief TCP header definition
 */
typedef struct __attribute__((packed)) {
    network_uint16_t src_port;                      /**< source port, in network byte order */
    network_uint16_t dst_port;                      /**< destination port, in network byte order */
    network_uint32_t seq_num;                       /**< sequence number, in network byte order */
    network_uint32_t ack_num;                       /**< Acknowledgement number, in network byte order */
    network_uint16_t off_ctl;                       /**< Data Offset and control Bits in network byte order */
    network_uint16_t window;                        /**< window, in network byte order */
    network_uint16_t checksum;                      /**< checksum, in network byte order */
    network_uint16_t urgent_ptr;                    /**< urgent pointer, in network byte order */
    network_uint32_t options[TCP_MAX_HDR_OPTIONS];  /**< Option Fields (Optional) */
} tcp_hdr_t;

#ifdef __cplusplus
}
#endif

#endif /* GNRC_TCP_TCB_H_ */
/** @} */