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/*
* Copyright (C) 2015-2017 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_tcp TCP
* @ingroup net
* @brief Provides TCP header and helper functions
*
* @{
*
* @file
* @brief TCP header and helper functions
*
* @author Simon Brummer <simon.brummer@posteo.de>
*/
#ifndef TCP_H
#define TCP_H
#include "byteorder.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief TCP offset value boundries
* @{
*/
#define TCP_HDR_OFFSET_MIN (0x05)
#define TCP_HDR_OFFSET_MAX (0x0F)
/** @} */
/**
* @brief TCP Option "Kind" field defines
* @{
*/
#define TCP_OPTION_KIND_EOL (0x00) /**< "End of List"-Option */
#define TCP_OPTION_KIND_NOP (0x01) /**< "No Operatrion"-Option */
#define TCP_OPTION_KIND_MSS (0x02) /**< "Maximum Segment Size"-Option */
/** @} */
/**
* @brief TCP Option Length Field Values
* @{
*/
#define TCP_OPTION_LENGTH_MSS (0x04) /**< MSS Option Size always 4 */
/** @} */
/**
* @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 */
} tcp_hdr_t;
/**
* @brief TCP Option Field Helper Structure
*/
typedef struct __attribute__((packed)) {
uint8_t kind; /**< TCP options Kind field */
uint8_t length; /**< TCP options Length field */
uint8_t value[]; /**< Pointer to TCP options Value field */
} tcp_hdr_opt_t;
#ifdef __cplusplus
}
#endif
#endif /* TCP_H */
/** @} */