mirror of
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP
synced 2025-10-20 22:10:04 +08:00
502 lines
18 KiB
C
502 lines
18 KiB
C
/*
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* FreeRTOS+TCP V4.3.0
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* Copyright (C) 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* http://aws.amazon.com/freertos
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* http://www.FreeRTOS.org
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*/
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/*=============================================================================
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*
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* ##### # ##### #### ######
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* # # # # # # # # # # #
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* # # # # # #
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* # ### ##### # # # # # #
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* # # # # # # # # #####
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* # # # # # # #### # # #
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* # # # # # # # # # #
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* # # # # #### # # # #
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* #### ##### # # # #### #### ####
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* #
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* ###
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* Tiny-TCP: TCP without sliding windows.
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*
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*=============================================================================*/
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/**
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* @file FreeRTOS_TINY_TCP.c
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* @brief Module which handles TCP when windowing is disabled
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*
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* In this module all ports and IP addresses and sequence numbers are
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* being stored in host byte-order.
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*/
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/* Standard includes. */
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#include <stdint.h>
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/* FreeRTOS includes. */
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#include "FreeRTOS.h"
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#include "task.h"
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/* FreeRTOS+TCP includes. */
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#include "FreeRTOS_IP.h"
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#include "FreeRTOS_UDP_IP.h"
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#include "FreeRTOS_Sockets.h"
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#include "FreeRTOS_IP_Private.h"
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#if ( ipconfigUSE_TCP == 1 )
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#if ( ipconfigUSE_TCP_WIN == 0 )
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/** @brief Logging verbosity level. */
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BaseType_t xTCPWindowLoggingLevel = 0;
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static portINLINE BaseType_t xSequenceGreaterThanOrEqual( uint32_t a,
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uint32_t b );
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/**
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* @brief Test if a>=b. This function is required since the sequence numbers can roll over.
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*
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* @param[in] a The first sequence number.
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* @param[in] b The second sequence number.
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*
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* @return pdTRUE if a>=b, else pdFALSE.
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*/
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static portINLINE BaseType_t xSequenceGreaterThanOrEqual( uint32_t a,
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uint32_t b )
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{
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BaseType_t xResult = pdFALSE;
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/* Test if a >= b */
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if( ( ( a - b ) & 0x80000000U ) == 0U )
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{
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xResult = pdTRUE;
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}
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return xResult;
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}
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static portINLINE void vTCPTimerSet( TCPTimer_t * pxTimer );
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/**
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* @brief Set the timer's "born" time.
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*
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* @param[in] pxTimer The TCP timer.
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*/
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static portINLINE void vTCPTimerSet( TCPTimer_t * pxTimer )
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{
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pxTimer->uxBorn = xTaskGetTickCount();
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}
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/*-----------------------------------------------------------*/
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static portINLINE uint32_t ulTimerGetAge( const TCPTimer_t * pxTimer );
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/**
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* @brief Get the timer age in milliseconds.
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*
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* @param[in] pxTimer The timer whose age is to be fetched.
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*
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* @return The time in milliseconds since the timer was born.
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*/
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static portINLINE uint32_t ulTimerGetAge( const TCPTimer_t * pxTimer )
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{
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TickType_t uxNow = xTaskGetTickCount();
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TickType_t uxDiff = uxNow - pxTimer->uxBorn;
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return uxDiff * portTICK_PERIOD_MS;
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}
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/*-----------------------------------------------------------*/
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/**
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* @brief Data was received at 'ulSequenceNumber'. See if it was expected
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* and if there is enough space to store the new data.
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*
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* @param[in] pxWindow The window to be checked.
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* @param[in] ulSequenceNumber Sequence number of the data received.
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* @param[in] ulLength Length of the data received.
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* @param[in] ulSpace Space in the buffer.
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*
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* @return A 0 is returned if there is enough space and the sequence number is correct,
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* if not then a -1 is returned.
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*
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* @note if true may be passed directly to user (segment expected and window is empty).
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* But pxWindow->ackno should always be used to set "BUF->ackno".
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*/
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int32_t lTCPWindowRxCheck( TCPWindow_t * pxWindow,
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uint32_t ulSequenceNumber,
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uint32_t ulLength,
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uint32_t ulSpace,
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uint32_t * pulSkipCount )
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{
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int32_t lReturn = -1;
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*pulSkipCount = 0;
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/* Data was received at 'ulSequenceNumber'. See if it was expected
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* and if there is enough space to store the new data. */
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if( ( pxWindow->rx.ulCurrentSequenceNumber != ulSequenceNumber ) || ( ulSpace < ulLength ) )
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{
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lReturn = -1;
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}
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else
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{
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pxWindow->rx.ulCurrentSequenceNumber += ( uint32_t ) ulLength;
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lReturn = 0;
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}
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return lReturn;
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}
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#endif /* ipconfigUSE_TCP_WIN == 0 */
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/*-----------------------------------------------------------*/
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#if ( ipconfigUSE_TCP_WIN == 0 )
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/**
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* @brief Add data to the Tx Window.
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*
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* @param[in] pxWindow The window to which the data is to be added.
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* @param[in] ulLength The length of the data to be added.
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* @param[in] lPosition Position in the stream.
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* @param[in] lMax Size of the Tx stream.
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*
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* @return The data actually added.
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*/
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int32_t lTCPWindowTxAdd( TCPWindow_t * pxWindow,
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uint32_t ulLength,
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int32_t lPosition,
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int32_t lMax )
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{
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TCPSegment_t * pxSegment = &( pxWindow->xTxSegment );
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int32_t lResult;
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/* Data is being scheduled for transmission. */
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/* lMax would indicate the size of the txStream. */
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( void ) lMax;
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/* This is tiny TCP: there is only 1 segment for outgoing data.
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* As long as 'lDataLength' is unequal to zero, the segment is still occupied. */
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if( pxSegment->lDataLength > 0 )
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{
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lResult = 0L;
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}
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else
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{
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if( ulLength > ( uint32_t ) pxSegment->lMaxLength )
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{
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if( ( xTCPWindowLoggingLevel != 0 ) && ( ipconfigTCP_MAY_LOG_PORT( pxWindow->usOurPortNumber ) != pdFALSE ) )
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{
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FreeRTOS_debug_printf( ( "lTCPWindowTxAdd: can only store %u / %d bytes\n", ( unsigned ) ulLength, ( int ) pxSegment->lMaxLength ) );
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}
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ulLength = ( uint32_t ) pxSegment->lMaxLength;
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}
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if( ( xTCPWindowLoggingLevel != 0 ) && ( ipconfigTCP_MAY_LOG_PORT( pxWindow->usOurPortNumber ) != pdFALSE ) )
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{
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FreeRTOS_debug_printf( ( "lTCPWindowTxAdd: SeqNr %u (%u) Len %u\n",
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( unsigned ) ( pxWindow->ulNextTxSequenceNumber - pxWindow->tx.ulFirstSequenceNumber ),
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( unsigned ) ( pxWindow->tx.ulCurrentSequenceNumber - pxWindow->tx.ulFirstSequenceNumber ),
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( unsigned ) ulLength ) );
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}
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/* The sequence number of the first byte in this packet. */
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pxSegment->ulSequenceNumber = pxWindow->ulNextTxSequenceNumber;
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pxSegment->lDataLength = ( int32_t ) ulLength;
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pxSegment->lStreamPos = lPosition;
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pxSegment->u.ulFlags = 0U;
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vTCPTimerSet( &( pxSegment->xTransmitTimer ) );
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/* Increase the sequence number of the next data to be stored for
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* transmission. */
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pxWindow->ulNextTxSequenceNumber += ulLength;
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lResult = ( int32_t ) ulLength;
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}
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return lResult;
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}
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#endif /* ipconfigUSE_TCP_WIN == 0 */
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/*-----------------------------------------------------------*/
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#if ( ipconfigUSE_TCP_WIN == 0 )
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/**
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* @brief Fetches data to be sent.
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*
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* @param[in] pxWindow The window for the connection.
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* @param[in] ulWindowSize The size of the window.
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* @param[out] plPosition plPosition will point to a location with the circular data buffer: txStream.
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*
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* @return return the amount of data which may be sent along with the position in the txStream.
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*/
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uint32_t ulTCPWindowTxGet( TCPWindow_t * pxWindow,
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uint32_t ulWindowSize,
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int32_t * plPosition )
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{
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TCPSegment_t * pxSegment = &( pxWindow->xTxSegment );
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uint32_t ulLength = ( uint32_t ) pxSegment->lDataLength;
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uint32_t ulMaxTime;
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if( ulLength != 0U )
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{
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/* _HT_ Still under investigation */
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( void ) ulWindowSize;
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if( pxSegment->u.bits.bOutstanding != pdFALSE_UNSIGNED )
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{
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/* As 'ucTransmitCount' has a minimum of 1, take 2 * RTT */
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ulMaxTime = ( ( uint32_t ) 1U ) << pxSegment->u.bits.ucTransmitCount;
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ulMaxTime *= ( uint32_t ) pxWindow->lSRTT;
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if( ulTimerGetAge( &( pxSegment->xTransmitTimer ) ) < ulMaxTime )
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{
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ulLength = 0U;
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}
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}
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if( ulLength != 0U )
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{
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pxSegment->u.bits.bOutstanding = pdTRUE_UNSIGNED;
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pxSegment->u.bits.ucTransmitCount++;
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vTCPTimerSet( &pxSegment->xTransmitTimer );
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pxWindow->ulOurSequenceNumber = pxSegment->ulSequenceNumber;
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*plPosition = pxSegment->lStreamPos;
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}
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}
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return ulLength;
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}
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#endif /* ipconfigUSE_TCP_WIN == 0 */
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/*-----------------------------------------------------------*/
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#if ( ipconfigUSE_TCP_WIN == 0 )
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/**
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* @brief Has the transmission completed.
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*
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* @param[in] pxWindow The window whose transmission window is to be checked.
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*
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* @return If there is no outstanding data then pdTRUE is returned,
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* else pdFALSE.
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*/
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BaseType_t xTCPWindowTxDone( const TCPWindow_t * pxWindow )
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{
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BaseType_t xReturn;
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/* Has the outstanding data been sent because user wants to shutdown? */
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if( pxWindow->xTxSegment.lDataLength == 0 )
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{
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xReturn = pdTRUE;
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}
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else
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{
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xReturn = pdFALSE;
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}
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return xReturn;
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}
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#endif /* ipconfigUSE_TCP_WIN == 0 */
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/*-----------------------------------------------------------*/
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#if ( ipconfigUSE_TCP_WIN == 0 )
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static BaseType_t prvTCPWindowTxHasSpace( TCPWindow_t const * pxWindow,
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uint32_t ulWindowSize );
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/**
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* @brief Check if the window has space for one message.
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*
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* @param[in] pxWindow The window to be checked.
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* @param[in] ulWindowSize Size of the window.
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*
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* @return pdTRUE if the window has space, pdFALSE otherwise.
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*/
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static BaseType_t prvTCPWindowTxHasSpace( TCPWindow_t const * pxWindow,
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uint32_t ulWindowSize )
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{
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BaseType_t xReturn;
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if( ulWindowSize >= pxWindow->usMSSInit )
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{
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xReturn = pdTRUE;
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}
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else
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{
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xReturn = pdFALSE;
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}
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return xReturn;
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}
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#endif /* ipconfigUSE_TCP_WIN == 0 */
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/*-----------------------------------------------------------*/
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#if ( ipconfigUSE_TCP_WIN == 0 )
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/**
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* @brief Check data to be sent and calculate the time period the process may sleep.
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*
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* @param[in] pxWindow The window to be checked.
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* @param[in] ulWindowSize Size of the window.
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* @param[out] pulDelay The time period (in ticks) that the process may sleep.
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*
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* @return pdTRUE if the process should sleep or pdFALSE.
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*/
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BaseType_t xTCPWindowTxHasData( TCPWindow_t const * pxWindow,
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uint32_t ulWindowSize,
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TickType_t * pulDelay )
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{
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TCPSegment_t const * pxSegment = &( pxWindow->xTxSegment );
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BaseType_t xReturn;
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TickType_t ulAge, ulMaxAge;
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/* Check data to be sent. */
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*pulDelay = ( TickType_t ) 0;
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if( pxSegment->lDataLength == 0 )
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{
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/* Got nothing to send right now. */
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xReturn = pdFALSE;
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}
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else
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{
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if( pxSegment->u.bits.bOutstanding != pdFALSE_UNSIGNED )
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{
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ulAge = ulTimerGetAge( &pxSegment->xTransmitTimer );
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ulMaxAge = ( ( TickType_t ) 1U << pxSegment->u.bits.ucTransmitCount ) * ( ( uint32_t ) pxWindow->lSRTT );
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if( ulMaxAge > ulAge )
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{
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*pulDelay = ulMaxAge - ulAge;
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}
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xReturn = pdTRUE;
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}
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else if( prvTCPWindowTxHasSpace( pxWindow, ulWindowSize ) == pdFALSE )
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{
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/* Too many outstanding messages. */
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xReturn = pdFALSE;
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}
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else
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{
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xReturn = pdTRUE;
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}
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}
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return xReturn;
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}
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#endif /* ipconfigUSE_TCP_WIN == 0 */
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/*-----------------------------------------------------------*/
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#if ( ipconfigUSE_TCP_WIN == 0 )
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/**
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* @brief Receive a normal ACK.
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*
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* @param[in] pxWindow The window for this particular connection.
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* @param[in] ulSequenceNumber The sequence number of the packet.
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*
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* @return Number of bytes to send.
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*/
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uint32_t ulTCPWindowTxAck( TCPWindow_t * pxWindow,
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uint32_t ulSequenceNumber )
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{
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TCPSegment_t * pxSegment = &( pxWindow->xTxSegment );
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uint32_t ulDataLength = ( uint32_t ) pxSegment->lDataLength;
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/* Receive a normal ACK */
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if( ulDataLength != 0U )
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{
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if( ulSequenceNumber < ( pxWindow->tx.ulCurrentSequenceNumber + ulDataLength ) )
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{
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if( ipconfigTCP_MAY_LOG_PORT( pxWindow->usOurPortNumber ) != pdFALSE )
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{
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FreeRTOS_debug_printf( ( "win_tx_ack: acked %u expc %u len %u\n",
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( unsigned ) ( ulSequenceNumber - pxWindow->tx.ulFirstSequenceNumber ),
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( unsigned ) ( pxWindow->tx.ulCurrentSequenceNumber - pxWindow->tx.ulFirstSequenceNumber ),
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( unsigned ) ulDataLength ) );
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}
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/* Nothing to send right now. */
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ulDataLength = 0U;
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}
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else
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{
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pxWindow->tx.ulCurrentSequenceNumber += ulDataLength;
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if( ( xTCPWindowLoggingLevel != 0 ) && ( ipconfigTCP_MAY_LOG_PORT( pxWindow->usOurPortNumber ) != pdFALSE ) )
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{
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FreeRTOS_debug_printf( ( "win_tx_ack: acked seqnr %u len %u\n",
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( unsigned ) ( ulSequenceNumber - pxWindow->tx.ulFirstSequenceNumber ),
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( unsigned ) ulDataLength ) );
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}
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pxSegment->lDataLength = 0;
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}
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}
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return ulDataLength;
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}
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#endif /* ipconfigUSE_TCP_WIN == 0 */
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/*-----------------------------------------------------------*/
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#if ( ipconfigUSE_TCP_WIN == 0 )
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/**
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* @brief This function will be called as soon as a FIN is received to check
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* whether all transmit queues are empty or not.
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*
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* @param[in] pxWindow The window to be checked.
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*
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* @return It will return true if there are no 'open' reception segments.
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*/
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BaseType_t xTCPWindowRxEmpty( const TCPWindow_t * pxWindow )
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{
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/* Return true if 'ulCurrentSequenceNumber >= ulHighestSequenceNumber'
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* 'ulCurrentSequenceNumber' is the highest sequence number stored,
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* 'ulHighestSequenceNumber' is the highest sequence number seen. */
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return xSequenceGreaterThanOrEqual( pxWindow->rx.ulCurrentSequenceNumber, pxWindow->rx.ulHighestSequenceNumber );
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}
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#endif /* ipconfigUSE_TCP_WIN == 0 */
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/*-----------------------------------------------------------*/
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#if ( ipconfigUSE_TCP_WIN == 0 )
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/**
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* @brief Destroy a window.
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*
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* @param[in] pxWindow Pointer to the window to be destroyed.
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*
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* @return Always returns a NULL.
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*/
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void vTCPWindowDestroy( const TCPWindow_t * pxWindow )
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{
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/* As in tiny TCP there are no shared segments descriptors, there is
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* nothing to release. */
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( void ) pxWindow;
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}
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#endif /* ipconfigUSE_TCP_WIN == 0 */
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/*-----------------------------------------------------------*/
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#endif /* ipconfigUSE_TCP == 1 */
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