261 lines
12 KiB
C
261 lines
12 KiB
C
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2019.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2019 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaims all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Header file for TCP.c.
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*/
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#ifndef _TCP_H_
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#define _TCP_H_
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/* Includes: */
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#include <avr/io.h>
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#include <stdbool.h>
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#include "EthernetProtocols.h"
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#include "Ethernet.h"
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#include "ProtocolDecoders.h"
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/* Macros: */
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/** Maximum number of TCP ports which can be open at the one time. */
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#define MAX_OPEN_TCP_PORTS 1
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/** Maximum number of TCP connections which can be sustained at the one time. */
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#define MAX_TCP_CONNECTIONS 3
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/** TCP window size, giving the maximum number of bytes which can be buffered at the one time. */
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#define TCP_WINDOW_SIZE 512
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/** Port number for HTTP transmissions. */
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#define TCP_PORT_HTTP SwapEndian_16(80)
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/** Data direction indicator for a TCP application buffer, indicating data from host-to-device. */
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#define TCP_PACKETDIR_IN false
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/** Data direction indicator for a TCP application buffer, indicating data from device-to-host. */
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#define TCP_PACKETDIR_OUT true
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/** Congestion Window Reduced TCP flag mask. */
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#define TCP_FLAG_CWR (1 << 7)
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/** Explicit Congestion Notification TCP flag mask. */
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#define TCP_FLAG_ECE (1 << 6)
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/** Urgent TCP flag mask. */
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#define TCP_FLAG_URG (1 << 5)
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/** Data Acknowledge TCP flag mask. */
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#define TCP_FLAG_ACK (1 << 4)
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/** Data Push TCP flag mask. */
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#define TCP_FLAG_PSH (1 << 3)
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/** Reset TCP flag mask. */
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#define TCP_FLAG_RST (1 << 2)
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/** Synchronize TCP flag mask. */
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#define TCP_FLAG_SYN (1 << 1)
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/** Connection Finalize TCP flag mask. */
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#define TCP_FLAG_FIN (1 << 0)
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/** Application macro: Determines if the given application buffer contains a packet received from the host
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*
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* \param[in] Buffer Application buffer to check
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*
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* \return Boolean \c true if the buffer contains a packet from the host, \c false otherwise
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*/
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#define TCP_APP_HAS_RECEIVED_PACKET(Buffer) (Buffer->Ready && (Buffer->Direction == TCP_PACKETDIR_IN))
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/** Application macro: Indicates if the application buffer is currently locked by the application for device-to-host transfers.
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*
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* \param[in] Buffer Application buffer to check
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*
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* \return Boolean \c true if the buffer has been captured by the application for device-to-host transmissions, \c false otherwise
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*/
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#define TCP_APP_HAVE_CAPTURED_BUFFER(Buffer) (!(Buffer->Ready) && Buffer->InUse && \
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(Buffer->Direction == TCP_PACKETDIR_OUT))
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/** Application macro: Indicates if the application can lock the buffer for multiple continued device-to-host transmissions.
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*
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* \param[in] Buffer Application buffer to check
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*
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* \return Boolean \c true if the buffer may be captured by the application for device-to-host transmissions, \c false otherwise
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*/
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#define TCP_APP_CAN_CAPTURE_BUFFER(Buffer) Buffer->InUse
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/** Application macro: Captures the application buffer, locking it for device-to-host transmissions only. This should be
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* performed when the application needs to transmit several packets worth of data in succession with no interruptions from the host.
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*
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* \pre The application must check that the buffer can be locked first using TCP_APP_CAN_CAPTURE_BUFFER().
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*
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* \param[in] Buffer Application buffer to lock
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*/
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#define TCP_APP_CAPTURE_BUFFER(Buffer) do { Buffer->Direction = TCP_PACKETDIR_OUT; Buffer->InUse = true; } while (0)
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/** Application macro: Releases a captured application buffer, allowing for host-to-device packets to be received.
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*
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* \param[in] Buffer Application buffer to release
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*/
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#define TCP_APP_RELEASE_BUFFER(Buffer) do { Buffer->InUse = false; } while (0)
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/** Application macro: Sends the contents of the given application buffer to the host.
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*
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* \param[in] Buffer Application buffer to send
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* \param[in] Len Length of data contained in the buffer
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*/
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#define TCP_APP_SEND_BUFFER(Buffer, Len) do { Buffer->Direction = TCP_PACKETDIR_OUT; Buffer->Length = Len; Buffer->Ready = true; } while (0)
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/** Application macro: Clears the application buffer, ready for a packet to be written to it.
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*
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* \param[in] Buffer Application buffer to clear
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*/
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#define TCP_APP_CLEAR_BUFFER(Buffer) do { Buffer->Ready = false; Buffer->Length = 0; } while (0)
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/** Application macro: Closes an open connection to a host.
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*
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* \param[in] Connection Open TCP connection to close
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*/
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#define TCP_APP_CLOSECONNECTION(Connection) do { Connection->State = TCP_Connection_Closing; } while (0)
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/* Enums: */
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/** Enum for possible TCP port states. */
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enum TCP_PortStates_t
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{
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TCP_Port_Closed = 0, /**< TCP port closed, no connections to a host may be made on this port. */
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TCP_Port_Open = 1, /**< TCP port open, connections to a host may be made on this port. */
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};
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/** Enum for possible TCP connection states. */
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enum TCP_ConnectionStates_t
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{
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TCP_Connection_Listen = 0, /**< Listening for a connection from a host */
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TCP_Connection_SYNSent = 1, /**< Unused */
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TCP_Connection_SYNReceived = 2, /**< SYN received, waiting for ACK */
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TCP_Connection_Established = 3, /**< Connection established in both directions */
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TCP_Connection_FINWait1 = 4, /**< Closing, waiting for ACK */
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TCP_Connection_FINWait2 = 5, /**< Closing, waiting for FIN ACK */
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TCP_Connection_CloseWait = 6, /**< Closing, waiting for ACK */
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TCP_Connection_Closing = 7, /**< Unused */
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TCP_Connection_LastACK = 8, /**< Unused */
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TCP_Connection_TimeWait = 9, /**< Unused */
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TCP_Connection_Closed = 10, /**< Connection closed in both directions */
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};
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/* Type Defines: */
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/** Type define for a TCP connection buffer structure, including size, data and direction. */
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typedef struct
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{
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uint16_t Length; /**< Length of data in the TCP application buffer */
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uint8_t Data[TCP_WINDOW_SIZE]; /**< TCP application data buffer */
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bool Direction; /**< Buffer transmission direction, either TCP_PACKETDIR_IN or TCP_PACKETDIR_OUT */
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bool Ready; /**< If data from host, indicates buffer ready to be read, otherwise indicates
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* buffer ready to be sent to the host
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*/
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bool InUse; /**< Indicates if the buffer is locked to to the current direction, and cannot be changed */
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} TCP_ConnectionBuffer_t;
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/** Type define for a TCP connection information structure. */
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typedef struct
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{
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uint32_t SequenceNumberIn; /**< Current TCP sequence number for host-to-device */
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uint32_t SequenceNumberOut; /**< Current TCP sequence number for device-to-host */
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TCP_ConnectionBuffer_t Buffer; /**< Connection application data buffer */
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} TCP_ConnectionInfo_t;
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/** Type define for a complete TCP connection state. */
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typedef struct
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{
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uint16_t Port; /**< Connection port number on the device */
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uint16_t RemotePort; /**< Connection port number on the host */
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IP_Address_t RemoteAddress; /**< Connection protocol IP address of the host */
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TCP_ConnectionInfo_t Info; /**< Connection information, including application buffer */
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uint8_t State; /**< Current connection state, a value from the \ref TCP_ConnectionStates_t enum */
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} TCP_ConnectionState_t;
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/** Type define for a TCP port state. */
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typedef struct
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{
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uint16_t Port; /**< TCP port number on the device */
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uint8_t State; /**< Current port state, a value from the \ref TCP_PortStates_t enum */
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void (*ApplicationHandler) (TCP_ConnectionState_t* ConnectionState,
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TCP_ConnectionBuffer_t* Buffer); /**< Port application handler */
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} TCP_PortState_t;
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/** Type define for a TCP packet header. */
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typedef struct
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{
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uint16_t SourcePort; /**< Source port of the TCP packet */
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uint16_t DestinationPort; /**< Destination port of the TCP packet */
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uint32_t SequenceNumber; /**< Data sequence number of the packet */
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uint32_t AcknowledgmentNumber; /**< Data acknowledgment number of the packet */
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unsigned Reserved : 4; /**< Reserved, must be all 0 */
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unsigned DataOffset : 4; /**< Offset of the data from the start of the header, in 4 byte chunks */
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uint8_t Flags; /**< TCP packet flags */
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uint16_t WindowSize; /**< Current data window size (bytes remaining in reception buffer) */
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uint16_t Checksum; /**< TCP checksum */
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uint16_t UrgentPointer; /**< Urgent data pointer */
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} TCP_Header_t;
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/* Function Prototypes: */
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void TCP_Init(void);
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void TCP_Task(void);
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bool TCP_SetPortState(const uint16_t Port,
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const uint8_t State,
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void (*Handler)(TCP_ConnectionState_t*, TCP_ConnectionBuffer_t*));
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uint8_t TCP_GetPortState(const uint16_t Port);
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bool TCP_SetConnectionState(const uint16_t Port,
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const IP_Address_t* RemoteAddress,
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const uint16_t RemotePort,
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const uint8_t State);
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uint8_t TCP_GetConnectionState(const uint16_t Port,
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const IP_Address_t* RemoteAddress,
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const uint16_t RemotePort);
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TCP_ConnectionInfo_t* TCP_GetConnectionInfo(const uint16_t Port,
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const IP_Address_t* RemoteAddress,
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const uint16_t RemotePort);
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int16_t TCP_ProcessTCPPacket(void* IPHeaderInStart,
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void* TCPHeaderInStart,
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void* TCPHeaderOutStart);
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#if defined(INCLUDE_FROM_TCP_C)
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static uint16_t TCP_Checksum16(void* TCPHeaderOutStart,
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const IP_Address_t* SourceAddress,
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const IP_Address_t* DestinationAddress,
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uint16_t TCPOutSize);
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#endif
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#endif
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