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84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
/*
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* Copyright (C) 2017 Simon Brummer
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @defgroup net_tcp TCP
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* @ingroup net
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* @brief Provides TCP header and helper functions
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*
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* @{
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*
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* @file
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* @brief TCP header and helper functions
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*
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* @author Simon Brummer <brummer.simon@googlemail.com>
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*/
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#ifndef TCP_H
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#define TCP_H
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#include "byteorder.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief TCP offset value boundries
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* @{
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*/
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#define TCP_HDR_OFFSET_MIN (0x05)
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#define TCP_HDR_OFFSET_MAX (0x0F)
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/** @} */
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/**
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* @brief TCP Option "Kind" field defines
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* @{
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*/
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#define TCP_OPTION_KIND_EOL (0x00) /**< "End of List"-Option */
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#define TCP_OPTION_KIND_NOP (0x01) /**< "No Operatrion"-Option */
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#define TCP_OPTION_KIND_MSS (0x02) /**< "Maximum Segment Size"-Option */
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/** @} */
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/**
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* @brief TCP Option Length Field Values
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* @{
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*/
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#define TCP_OPTION_LENGTH_MSS (0x04) /**< MSS Option Size always 4 */
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/** @} */
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/**
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* @brief TCP header definition
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*/
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typedef struct __attribute__((packed)) {
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network_uint16_t src_port; /**< source port, in network byte order */
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network_uint16_t dst_port; /**< destination port, in network byte order */
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network_uint32_t seq_num; /**< sequence number, in network byte order */
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network_uint32_t ack_num; /**< Acknowledgement number, in network byte order */
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network_uint16_t off_ctl; /**< Data Offset and control Bits in network byte order */
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network_uint16_t window; /**< window, in network byte order */
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network_uint16_t checksum; /**< checksum, in network byte order */
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network_uint16_t urgent_ptr; /**< urgent pointer, in network byte order */
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} tcp_hdr_t;
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/**
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* @brief TCP Option Field Helper Structure
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*/
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typedef struct __attribute__((packed)) {
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uint8_t kind; /**< TCP options Kind field */
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uint8_t length; /**< TCP options Length field */
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uint8_t value[]; /**< Pointer to TCP options Value field */
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} tcp_hdr_opt_t;
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#ifdef __cplusplus
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}
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#endif
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#endif /* TCP_H */
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/** @} */
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