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92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
/*
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* Copyright (C) 2015-2017 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 <simon.brummer@posteo.de>
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*/
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#ifndef NET_TCP_H
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#define NET_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 boundaries.
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* @{
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*/
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#define TCP_HDR_OFFSET_MIN (0x05) /**< Header offset minimum value */
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#define TCP_HDR_OFFSET_MAX (0x0F) /**< Header offset maximum value */
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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 Operation"-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_MIN (2U) /**< Minimum option field size in bytes */
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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[]; /**< TCP options "Value" field */
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} tcp_hdr_opt_t;
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/**
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* @brief Print the given TCP header to STDOUT
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*
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* @param[in] hdr TCP header to print
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*/
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void tcp_hdr_print(tcp_hdr_t *hdr);
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#ifdef __cplusplus
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}
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#endif
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#endif /* NET_TCP_H */
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/** @} */
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