mirror of
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP
synced 2025-10-20 22:10:04 +08:00
1ab6eb8885
* Update source location for coverity * Add coverage checker * Add build check with default configuration * Fix build combination and DNS error * uncrustified and fixed cmakelists * This commit updates version number in all files to Development-Branch * Update version number macros * This commit fixes a typo in version number macro * Added a 'critical section' to prevent a race condition in stream buffers * Uncrustify: triggered by comment. * Fixed unit-tests by adding mocked functions * Initial commit of file README.md * Update README.md * Fix the title of README file in coverity * Addressed issue comments * Update command * Add details about remaining exception * Move file to original location * Remove use of sudo in commands * Fix links; added coverity version note * Update README.md * Remove CMake installation instructions * Update manifest/history and copyright year * Update kernel version to 10.4.5 * Update remaining copyright year instances * Update the version number macros * Update license header titles * Remove kernel license header and add TCP header Co-authored-by: GitHub Action <action@github.com> Co-authored-by: Gaurav-Aggarwal-AWS <33462878+aggarg@users.noreply.github.com>
854 lines
38 KiB
C
854 lines
38 KiB
C
/*
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* FreeRTOS+TCP <DEVELOPMENT BRANCH>
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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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* @file FreeRTOS_TCP_IP.c
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* @brief Module which handles the TCP connections for FreeRTOS+TCP.
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* It depends on FreeRTOS_TCP_WIN.c, which handles the TCP windowing
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* schemes.
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*
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* Endianness: in this module all ports and IP addresses are stored in
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* host byte-order, except fields in the IP-packets
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*/
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/* Standard includes. */
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#include <stdint.h>
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#include <stdio.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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#include "queue.h"
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#include "semphr.h"
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/* FreeRTOS+TCP includes. */
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#include "FreeRTOS_IP.h"
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#include "FreeRTOS_Sockets.h"
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#include "FreeRTOS_IP_Private.h"
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#include "FreeRTOS_UDP_IP.h"
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#include "FreeRTOS_DHCP.h"
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#include "NetworkInterface.h"
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#include "NetworkBufferManagement.h"
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#include "FreeRTOS_ARP.h"
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#include "FreeRTOS_TCP_Reception.h"
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#include "FreeRTOS_TCP_Transmission.h"
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#include "FreeRTOS_TCP_State_Handling.h"
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#include "FreeRTOS_TCP_Utils.h"
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/* Just make sure the contents doesn't get compiled if TCP is not enabled. */
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#if ipconfigUSE_TCP == 1
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/** @brief When closing a socket an event is posted to the Network Event Queue.
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* If the queue is full, then the event is not posted and the socket
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* can be orphaned. To prevent this, the below variable is used to keep
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* track of any socket which needs to be closed. This variable can be
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* accessed by the IP task only. Thus, preventing any race condition.
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*/
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/* MISRA Ref 8.9.1 [File scoped variables] */
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/* More details at: https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/blob/main/MISRA.md#rule-89 */
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/* coverity[misra_c_2012_rule_8_9_violation] */
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static FreeRTOS_Socket_t * xPreviousSocket = NULL;
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/*
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* For anti-hang protection and TCP keep-alive messages. Called in two places:
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* after receiving a packet and after a state change. The socket's alive timer
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* may be reset.
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*/
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static void prvTCPTouchSocket( FreeRTOS_Socket_t * pxSocket );
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/*
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* Calculate when this socket needs to be checked to do (re-)transmissions.
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*/
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static TickType_t prvTCPNextTimeout( FreeRTOS_Socket_t * pxSocket );
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#if ( ipconfigHAS_DEBUG_PRINTF != 0 )
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/*
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* For logging and debugging: make a string showing the TCP flags.
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*/
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const char * prvTCPFlagMeaning( UBaseType_t xFlags );
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#endif /* ipconfigHAS_DEBUG_PRINTF != 0 */
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/*-----------------------------------------------------------*/
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/** @brief Close the socket another time.
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*
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* @param[in] pxSocket: The socket to be checked.
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*/
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/* coverity[single_use] */
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void vSocketCloseNextTime( FreeRTOS_Socket_t * pxSocket )
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{
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if( ( xPreviousSocket != NULL ) && ( xPreviousSocket != pxSocket ) )
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{
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( void ) vSocketClose( xPreviousSocket );
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}
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xPreviousSocket = pxSocket;
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}
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/*-----------------------------------------------------------*/
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/**
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* @brief As soon as a TCP socket timer expires, this function will be called
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* (from xTCPTimerCheck). It can send a delayed ACK or new data.
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*
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* @param[in] pxSocket: socket to be checked.
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*
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* @return 0 on success, a negative error code on failure. A negative value will be
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* returned in case the hang-protection has put the socket in a wait-close state.
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*
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* @note Sequence of calling (normally) :
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* IP-Task:
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* xTCPTimerCheck() // Check all sockets ( declared in FreeRTOS_Sockets.c )
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* xTCPSocketCheck() // Either send a delayed ACK or call prvTCPSendPacket()
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* prvTCPSendPacket() // Either send a SYN or call prvTCPSendRepeated ( regular messages )
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* prvTCPSendRepeated() // Send at most 8 messages on a row
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* prvTCPReturnPacket() // Prepare for returning
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* xNetworkInterfaceOutput() // Sends data to the NIC ( declared in portable/NetworkInterface/xxx )
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*/
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BaseType_t xTCPSocketCheck( FreeRTOS_Socket_t * pxSocket )
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{
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BaseType_t xResult = 0;
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BaseType_t xReady = pdFALSE;
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if( ( pxSocket->u.xTCP.eTCPState >= eESTABLISHED ) && ( pxSocket->u.xTCP.txStream != NULL ) )
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{
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/* The API FreeRTOS_send() might have added data to the TX stream. Add
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* this data to the windowing system so it can be transmitted. */
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prvTCPAddTxData( pxSocket );
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}
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#if ( ipconfigUSE_TCP_WIN == 1 )
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{
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if( pxSocket->u.xTCP.pxAckMessage != NULL )
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{
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/* The first task of this regular socket check is to send-out delayed
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* ACK's. */
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if( pxSocket->u.xTCP.bits.bUserShutdown == pdFALSE_UNSIGNED )
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{
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/* Earlier data was received but not yet acknowledged. This
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* function is called when the TCP timer for the socket expires, the
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* ACK may be sent now. */
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if( pxSocket->u.xTCP.eTCPState != eCLOSED )
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{
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if( ( xTCPWindowLoggingLevel > 1 ) && ipconfigTCP_MAY_LOG_PORT( pxSocket->usLocalPort ) )
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{
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FreeRTOS_debug_printf( ( "Send[%u->%u] del ACK %u SEQ %u (len %u)\n",
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pxSocket->usLocalPort,
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pxSocket->u.xTCP.usRemotePort,
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( unsigned ) ( pxSocket->u.xTCP.xTCPWindow.rx.ulCurrentSequenceNumber - pxSocket->u.xTCP.xTCPWindow.rx.ulFirstSequenceNumber ),
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( unsigned ) ( pxSocket->u.xTCP.xTCPWindow.ulOurSequenceNumber - pxSocket->u.xTCP.xTCPWindow.tx.ulFirstSequenceNumber ),
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( unsigned ) ( ipSIZE_OF_IPv4_HEADER + ipSIZE_OF_TCP_HEADER ) ) );
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}
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prvTCPReturnPacket( pxSocket, pxSocket->u.xTCP.pxAckMessage, ipSIZE_OF_IPv4_HEADER + ipSIZE_OF_TCP_HEADER, ipconfigZERO_COPY_TX_DRIVER );
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#if ( ipconfigZERO_COPY_TX_DRIVER != 0 )
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{
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/* The ownership has been passed to the SEND routine,
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* clear the pointer to it. */
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pxSocket->u.xTCP.pxAckMessage = NULL;
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}
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#endif /* ipconfigZERO_COPY_TX_DRIVER */
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}
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if( prvTCPNextTimeout( pxSocket ) > 1U )
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{
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/* Tell the code below that this function is ready. */
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xReady = pdTRUE;
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}
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}
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else
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{
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/* The user wants to perform an active shutdown(), skip sending
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* the delayed ACK. The function prvTCPSendPacket() will send the
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* FIN along with the ACK's. */
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}
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if( pxSocket->u.xTCP.pxAckMessage != NULL )
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{
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vReleaseNetworkBufferAndDescriptor( pxSocket->u.xTCP.pxAckMessage );
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pxSocket->u.xTCP.pxAckMessage = NULL;
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}
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}
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}
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#endif /* ipconfigUSE_TCP_WIN */
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if( xReady == pdFALSE )
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{
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/* The second task of this regular socket check is sending out data. */
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if( ( pxSocket->u.xTCP.eTCPState >= eESTABLISHED ) ||
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( pxSocket->u.xTCP.eTCPState == eCONNECT_SYN ) )
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{
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( void ) prvTCPSendPacket( pxSocket );
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}
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/* Set the time-out for the next wakeup for this socket. */
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( void ) prvTCPNextTimeout( pxSocket );
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#if ( ipconfigTCP_HANG_PROTECTION == 1 )
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{
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/* In all (non-connected) states in which keep-alive messages can not be sent
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* the anti-hang protocol will close sockets that are 'hanging'. */
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xResult = prvTCPStatusAgeCheck( pxSocket );
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}
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#endif
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}
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return xResult;
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}
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/*-----------------------------------------------------------*/
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/**
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* @brief 'Touch' the socket to keep it alive/updated.
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*
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* @param[in] pxSocket: The socket to be updated.
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*
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* @note This is used for anti-hanging protection and TCP keep-alive messages.
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* Called in two places: after receiving a packet and after a state change.
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* The socket's alive timer may be reset.
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*/
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static void prvTCPTouchSocket( FreeRTOS_Socket_t * pxSocket )
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{
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#if ( ipconfigTCP_HANG_PROTECTION == 1 )
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{
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pxSocket->u.xTCP.xLastActTime = xTaskGetTickCount();
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}
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#endif
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#if ( ipconfigTCP_KEEP_ALIVE == 1 )
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{
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pxSocket->u.xTCP.bits.bWaitKeepAlive = pdFALSE_UNSIGNED;
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pxSocket->u.xTCP.bits.bSendKeepAlive = pdFALSE_UNSIGNED;
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pxSocket->u.xTCP.ucKeepRepCount = 0U;
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pxSocket->u.xTCP.xLastAliveTime = xTaskGetTickCount();
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}
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#endif
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( void ) pxSocket;
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}
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/*-----------------------------------------------------------*/
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/**
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* @brief Changing to a new state. Centralised here to do specific actions such as
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* resetting the alive timer, calling the user's OnConnect handler to notify
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* that a socket has got (dis)connected, and setting bit to unblock a call to
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* FreeRTOS_select().
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*
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* @param[in] pxSocket: The socket whose state we are trying to change.
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* @param[in] eTCPState: The state to which we want to change to.
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*/
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void vTCPStateChange( FreeRTOS_Socket_t * pxSocket,
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enum eTCP_STATE eTCPState )
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{
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FreeRTOS_Socket_t * xParent = NULL;
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BaseType_t bBefore = tcpNOW_CONNECTED( ( BaseType_t ) pxSocket->u.xTCP.eTCPState ); /* Was it connected ? */
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BaseType_t bAfter = tcpNOW_CONNECTED( ( BaseType_t ) eTCPState ); /* Is it connected now ? */
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#if ( ipconfigHAS_DEBUG_PRINTF != 0 )
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BaseType_t xPreviousState = ( BaseType_t ) pxSocket->u.xTCP.eTCPState;
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#endif
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#if ( ipconfigUSE_CALLBACKS == 1 )
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FreeRTOS_Socket_t * xConnected = NULL;
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#endif
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/* Has the connected status changed? */
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if( bBefore != bAfter )
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{
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/* Is the socket connected now ? */
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if( bAfter != pdFALSE )
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{
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/* if bPassQueued is true, this socket is an orphan until it gets connected. */
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if( pxSocket->u.xTCP.bits.bPassQueued != pdFALSE_UNSIGNED )
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{
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/* Now that it is connected, find it's parent. */
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if( pxSocket->u.xTCP.bits.bReuseSocket != pdFALSE_UNSIGNED )
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{
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xParent = pxSocket;
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}
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else
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{
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xParent = pxSocket->u.xTCP.pxPeerSocket;
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configASSERT( xParent != NULL );
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}
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if( xParent != NULL )
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{
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if( xParent->u.xTCP.pxPeerSocket == NULL )
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{
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xParent->u.xTCP.pxPeerSocket = pxSocket;
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}
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xParent->xEventBits |= ( EventBits_t ) eSOCKET_ACCEPT;
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#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
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{
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/* Library support FreeRTOS_select(). Receiving a new
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* connection is being translated as a READ event. */
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if( ( xParent->xSelectBits & ( ( EventBits_t ) eSELECT_READ ) ) != 0U )
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{
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xParent->xEventBits |= ( ( EventBits_t ) eSELECT_READ ) << SOCKET_EVENT_BIT_COUNT;
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}
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}
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#endif
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#if ( ipconfigUSE_CALLBACKS == 1 )
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{
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if( ( ipconfigIS_VALID_PROG_ADDRESS( xParent->u.xTCP.pxHandleConnected ) ) &&
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( xParent->u.xTCP.bits.bReuseSocket == pdFALSE_UNSIGNED ) )
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{
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/* The listening socket does not become connected itself, in stead
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* a child socket is created.
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* Postpone a call the OnConnect event until the end of this function. */
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xConnected = xParent;
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}
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}
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#endif
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}
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/* Don't need to access the parent socket anymore, so the
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* reference 'pxPeerSocket' may be cleared. */
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pxSocket->u.xTCP.pxPeerSocket = NULL;
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pxSocket->u.xTCP.bits.bPassQueued = pdFALSE_UNSIGNED;
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/* When true, this socket may be returned in a call to accept(). */
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pxSocket->u.xTCP.bits.bPassAccept = pdTRUE_UNSIGNED;
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}
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else
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{
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pxSocket->xEventBits |= ( EventBits_t ) eSOCKET_CONNECT;
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#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
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{
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if( ( pxSocket->xSelectBits & ( ( EventBits_t ) eSELECT_WRITE ) ) != 0U )
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{
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pxSocket->xEventBits |= ( ( EventBits_t ) eSELECT_WRITE ) << SOCKET_EVENT_BIT_COUNT;
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}
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}
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#endif
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}
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}
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else /* bAfter == pdFALSE, connection is closed. */
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{
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/* Notify/wake-up the socket-owner by setting a semaphore. */
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pxSocket->xEventBits |= ( EventBits_t ) eSOCKET_CLOSED;
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#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
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{
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if( ( pxSocket->xSelectBits & ( EventBits_t ) eSELECT_EXCEPT ) != 0U )
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{
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pxSocket->xEventBits |= ( ( EventBits_t ) eSELECT_EXCEPT ) << SOCKET_EVENT_BIT_COUNT;
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}
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}
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#endif
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}
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#if ( ipconfigUSE_CALLBACKS == 1 )
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{
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if( ( ipconfigIS_VALID_PROG_ADDRESS( pxSocket->u.xTCP.pxHandleConnected ) ) && ( xConnected == NULL ) )
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{
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/* The 'connected' state has changed, call the user handler. */
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xConnected = pxSocket;
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}
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}
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#endif /* ipconfigUSE_CALLBACKS */
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if( prvTCPSocketIsActive( pxSocket->u.xTCP.eTCPState ) == 0 )
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{
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/* Now the socket isn't in an active state anymore so it
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* won't need further attention of the IP-task.
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* Setting time-out to zero means that the socket won't get checked during
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* timer events. */
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pxSocket->u.xTCP.usTimeout = 0U;
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}
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}
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else
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{
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if( ( eTCPState == eCLOSED ) ||
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( eTCPState == eCLOSE_WAIT ) )
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{
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/* Socket goes to status eCLOSED because of a RST.
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* When nobody owns the socket yet, delete it. */
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if( ( pxSocket->u.xTCP.bits.bPassQueued != pdFALSE_UNSIGNED ) ||
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( pxSocket->u.xTCP.bits.bPassAccept != pdFALSE_UNSIGNED ) )
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{
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FreeRTOS_debug_printf( ( "vTCPStateChange: Closing socket\n" ) );
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if( pxSocket->u.xTCP.bits.bReuseSocket == pdFALSE_UNSIGNED )
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{
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configASSERT( xIsCallingFromIPTask() != pdFALSE );
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vSocketCloseNextTime( pxSocket );
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}
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}
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}
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}
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/* Fill in the new state. */
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pxSocket->u.xTCP.eTCPState = eTCPState;
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/* Touch the alive timers because moving to another state. */
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prvTCPTouchSocket( pxSocket );
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#if ( ipconfigHAS_DEBUG_PRINTF == 1 )
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{
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if( ( xTCPWindowLoggingLevel >= 0 ) && ( ipconfigTCP_MAY_LOG_PORT( pxSocket->usLocalPort ) ) )
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{
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FreeRTOS_debug_printf( ( "Socket %u -> %xip:%u State %s->%s\n",
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pxSocket->usLocalPort,
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( unsigned ) pxSocket->u.xTCP.ulRemoteIP,
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pxSocket->u.xTCP.usRemotePort,
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FreeRTOS_GetTCPStateName( ( UBaseType_t ) xPreviousState ),
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FreeRTOS_GetTCPStateName( ( UBaseType_t ) eTCPState ) ) );
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}
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}
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#endif /* ipconfigHAS_DEBUG_PRINTF */
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#if ( ipconfigUSE_CALLBACKS == 1 )
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{
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if( xConnected != NULL )
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{
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/* The 'connected' state has changed, call the OnConnect handler of the parent. */
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xConnected->u.xTCP.pxHandleConnected( ( Socket_t ) xConnected, bAfter );
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}
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}
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#endif
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if( xParent != NULL )
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{
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vSocketWakeUpUser( xParent );
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}
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}
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/*-----------------------------------------------------------*/
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/**
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* @brief Calculate after how much time this socket needs to be checked again.
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*
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* @param[in] pxSocket: The socket to be checked.
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*
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* @return The number of clock ticks before the timer expires.
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*/
|
|
static TickType_t prvTCPNextTimeout( FreeRTOS_Socket_t * pxSocket )
|
|
{
|
|
TickType_t ulDelayMs = ( TickType_t ) tcpMAXIMUM_TCP_WAKEUP_TIME_MS;
|
|
|
|
if( pxSocket->u.xTCP.eTCPState == eCONNECT_SYN )
|
|
{
|
|
/* The socket is actively connecting to a peer. */
|
|
if( pxSocket->u.xTCP.bits.bConnPrepared != pdFALSE_UNSIGNED )
|
|
{
|
|
/* Ethernet address has been found, use progressive timeout for
|
|
* active connect(). */
|
|
if( pxSocket->u.xTCP.ucRepCount < 3U )
|
|
{
|
|
ulDelayMs = ( ( ( uint32_t ) 3000U ) << ( pxSocket->u.xTCP.ucRepCount - 1U ) );
|
|
}
|
|
else
|
|
{
|
|
ulDelayMs = 11000U;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Still in the ARP phase: check every half second. */
|
|
ulDelayMs = 500U;
|
|
}
|
|
|
|
FreeRTOS_debug_printf( ( "Connect[%xip:%u]: next timeout %u: %u ms\n",
|
|
( unsigned ) pxSocket->u.xTCP.ulRemoteIP, pxSocket->u.xTCP.usRemotePort,
|
|
pxSocket->u.xTCP.ucRepCount, ( unsigned ) ulDelayMs ) );
|
|
pxSocket->u.xTCP.usTimeout = ( uint16_t ) ipMS_TO_MIN_TICKS( ulDelayMs );
|
|
}
|
|
else if( pxSocket->u.xTCP.usTimeout == 0U )
|
|
{
|
|
/* Let the sliding window mechanism decide what time-out is appropriate. */
|
|
BaseType_t xResult = xTCPWindowTxHasData( &pxSocket->u.xTCP.xTCPWindow, pxSocket->u.xTCP.ulWindowSize, &ulDelayMs );
|
|
|
|
if( ulDelayMs == 0U )
|
|
{
|
|
if( xResult != ( BaseType_t ) 0 )
|
|
{
|
|
ulDelayMs = 1U;
|
|
}
|
|
else
|
|
{
|
|
ulDelayMs = tcpMAXIMUM_TCP_WAKEUP_TIME_MS;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* ulDelayMs contains the time to wait before a re-transmission. */
|
|
}
|
|
|
|
pxSocket->u.xTCP.usTimeout = ( uint16_t ) ipMS_TO_MIN_TICKS( ulDelayMs ); /* LCOV_EXCL_BR_LINE ulDelayMs will not be smaller than 1 */
|
|
}
|
|
else
|
|
{
|
|
/* field '.usTimeout' has already been set (by the
|
|
* keep-alive/delayed-ACK mechanism). */
|
|
}
|
|
|
|
/* Return the number of clock ticks before the timer expires. */
|
|
return ( TickType_t ) pxSocket->u.xTCP.usTimeout;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/**
|
|
* @brief Process the received TCP packet.
|
|
*
|
|
* @param[in] pxDescriptor: The descriptor in which the TCP packet is held.
|
|
*
|
|
* @return If the processing of the packet was successful, then pdPASS is returned
|
|
* or else pdFAIL.
|
|
*
|
|
* @note FreeRTOS_TCP_IP has only 2 public functions, this is the second one:
|
|
* xProcessReceivedTCPPacket()
|
|
* prvTCPHandleState()
|
|
* prvTCPPrepareSend()
|
|
* prvTCPReturnPacket()
|
|
* xNetworkInterfaceOutput() // Sends data to the NIC
|
|
* prvTCPSendRepeated()
|
|
* prvTCPReturnPacket() // Prepare for returning
|
|
* xNetworkInterfaceOutput() // Sends data to the NIC
|
|
*/
|
|
BaseType_t xProcessReceivedTCPPacket( NetworkBufferDescriptor_t * pxDescriptor )
|
|
{
|
|
/* Function might modify the parameter. */
|
|
NetworkBufferDescriptor_t * pxNetworkBuffer = pxDescriptor;
|
|
|
|
configASSERT( pxNetworkBuffer != NULL );
|
|
configASSERT( pxNetworkBuffer->pucEthernetBuffer != NULL );
|
|
|
|
/* Map the buffer onto a ProtocolHeaders_t struct for easy access to the fields. */
|
|
|
|
/* MISRA Ref 11.3.1 [Misaligned access] */
|
|
/* More details at: https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/blob/main/MISRA.md#rule-113 */
|
|
/* coverity[misra_c_2012_rule_11_3_violation] */
|
|
const ProtocolHeaders_t * pxProtocolHeaders = ( ( const ProtocolHeaders_t * )
|
|
&( pxNetworkBuffer->pucEthernetBuffer[ ipSIZE_OF_ETH_HEADER + xIPHeaderSize( pxNetworkBuffer ) ] ) );
|
|
FreeRTOS_Socket_t * pxSocket;
|
|
uint16_t ucTCPFlags = pxProtocolHeaders->xTCPHeader.ucTCPFlags;
|
|
uint32_t ulLocalIP;
|
|
uint16_t usLocalPort = FreeRTOS_htons( pxProtocolHeaders->xTCPHeader.usDestinationPort );
|
|
uint16_t usRemotePort = FreeRTOS_htons( pxProtocolHeaders->xTCPHeader.usSourcePort );
|
|
uint32_t ulRemoteIP;
|
|
uint32_t ulSequenceNumber = FreeRTOS_ntohl( pxProtocolHeaders->xTCPHeader.ulSequenceNumber );
|
|
uint32_t ulAckNumber = FreeRTOS_ntohl( pxProtocolHeaders->xTCPHeader.ulAckNr );
|
|
BaseType_t xResult = pdPASS;
|
|
|
|
const IPHeader_t * pxIPHeader;
|
|
|
|
/* Check for a minimum packet size. */
|
|
if( pxNetworkBuffer->xDataLength < ( ipSIZE_OF_ETH_HEADER + xIPHeaderSize( pxNetworkBuffer ) + ipSIZE_OF_TCP_HEADER ) )
|
|
{
|
|
xResult = pdFAIL;
|
|
}
|
|
else
|
|
{
|
|
/* Map the ethernet buffer onto the IPHeader_t struct for easy access to the fields. */
|
|
|
|
/* MISRA Ref 11.3.1 [Misaligned access] */
|
|
/* More details at: https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/blob/main/MISRA.md#rule-113 */
|
|
/* coverity[misra_c_2012_rule_11_3_violation] */
|
|
pxIPHeader = ( ( const IPHeader_t * ) &( pxNetworkBuffer->pucEthernetBuffer[ ipSIZE_OF_ETH_HEADER ] ) );
|
|
ulLocalIP = FreeRTOS_htonl( pxIPHeader->ulDestinationIPAddress );
|
|
ulRemoteIP = FreeRTOS_htonl( pxIPHeader->ulSourceIPAddress );
|
|
|
|
/* Find the destination socket, and if not found: return a socket listing to
|
|
* the destination PORT. */
|
|
pxSocket = ( FreeRTOS_Socket_t * ) pxTCPSocketLookup( ulLocalIP, usLocalPort, ulRemoteIP, usRemotePort );
|
|
|
|
if( ( pxSocket == NULL ) || ( prvTCPSocketIsActive( pxSocket->u.xTCP.eTCPState ) == pdFALSE ) )
|
|
{
|
|
/* A TCP messages is received but either there is no socket with the
|
|
* given port number or the there is a socket, but it is in one of these
|
|
* non-active states: eCLOSED, eCLOSE_WAIT, eFIN_WAIT_2, eCLOSING, or
|
|
* eTIME_WAIT. */
|
|
|
|
FreeRTOS_debug_printf( ( "TCP: No active socket on port %d (%xip:%d)\n", usLocalPort, ( unsigned ) ulRemoteIP, usRemotePort ) );
|
|
|
|
/* Send a RST to all packets that can not be handled. As a result
|
|
* the other party will get a ECONN error. There are two exceptions:
|
|
* 1) A packet that already has the RST flag set.
|
|
* 2) A packet that only has the ACK flag set.
|
|
* A packet with only the ACK flag set might be the last ACK in
|
|
* a three-way hand-shake that closes a connection. */
|
|
if( ( ( ucTCPFlags & tcpTCP_FLAG_CTRL ) != tcpTCP_FLAG_ACK ) &&
|
|
( ( ucTCPFlags & tcpTCP_FLAG_RST ) == 0U ) )
|
|
{
|
|
( void ) prvTCPSendReset( pxNetworkBuffer );
|
|
}
|
|
|
|
/* The packet can't be handled. */
|
|
xResult = pdFAIL;
|
|
}
|
|
else
|
|
{
|
|
pxSocket->u.xTCP.ucRepCount = 0U;
|
|
|
|
if( pxSocket->u.xTCP.eTCPState == eTCP_LISTEN )
|
|
{
|
|
/* The matching socket is in a listening state. Test if the peer
|
|
* has set the SYN flag. */
|
|
if( ( ucTCPFlags & tcpTCP_FLAG_CTRL ) != tcpTCP_FLAG_SYN )
|
|
{
|
|
/* What happens: maybe after a reboot, a client doesn't know the
|
|
* connection had gone. Send a RST in order to get a new connect
|
|
* request. */
|
|
#if ( ipconfigHAS_DEBUG_PRINTF == 1 )
|
|
{
|
|
FreeRTOS_debug_printf( ( "TCP: Server can't handle flags: %s from %xip:%u to port %u\n",
|
|
prvTCPFlagMeaning( ( UBaseType_t ) ucTCPFlags ), ( unsigned ) ulRemoteIP, usRemotePort, usLocalPort ) );
|
|
}
|
|
#endif /* ipconfigHAS_DEBUG_PRINTF */
|
|
|
|
if( ( ucTCPFlags & tcpTCP_FLAG_RST ) == 0U )
|
|
{
|
|
( void ) prvTCPSendReset( pxNetworkBuffer );
|
|
}
|
|
|
|
xResult = pdFAIL;
|
|
}
|
|
else
|
|
{
|
|
/* prvHandleListen() will either return a newly created socket
|
|
* (if bReuseSocket is false), otherwise it returns the current
|
|
* socket which will later get connected. */
|
|
pxSocket = prvHandleListen( pxSocket, pxNetworkBuffer );
|
|
|
|
if( pxSocket == NULL )
|
|
{
|
|
xResult = pdFAIL;
|
|
}
|
|
}
|
|
} /* if( pxSocket->u.xTCP.eTCPState == eTCP_LISTEN ). */
|
|
else
|
|
{
|
|
/* This is not a socket in listening mode. Check for the RST
|
|
* flag. */
|
|
if( ( ucTCPFlags & tcpTCP_FLAG_RST ) != 0U )
|
|
{
|
|
FreeRTOS_debug_printf( ( "TCP: RST received from %xip:%u for %u\n", ( unsigned ) ulRemoteIP, usRemotePort, usLocalPort ) );
|
|
|
|
/* Implement https://tools.ietf.org/html/rfc5961#section-3.2. */
|
|
if( pxSocket->u.xTCP.eTCPState == eCONNECT_SYN )
|
|
{
|
|
/* Per the above RFC, "In the SYN-SENT state ... the RST is
|
|
* acceptable if the ACK field acknowledges the SYN." */
|
|
if( ulAckNumber == ( pxSocket->u.xTCP.xTCPWindow.ulOurSequenceNumber + 1U ) )
|
|
{
|
|
vTCPStateChange( pxSocket, eCLOSED );
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Check whether the packet matches the next expected sequence number. */
|
|
if( ulSequenceNumber == pxSocket->u.xTCP.xTCPWindow.rx.ulCurrentSequenceNumber )
|
|
{
|
|
vTCPStateChange( pxSocket, eCLOSED );
|
|
}
|
|
/* Otherwise, check whether the packet is within the receive window. */
|
|
else if( ( xSequenceGreaterThan( ulSequenceNumber, pxSocket->u.xTCP.xTCPWindow.rx.ulCurrentSequenceNumber ) != pdFALSE ) &&
|
|
( xSequenceLessThan( ulSequenceNumber, pxSocket->u.xTCP.xTCPWindow.rx.ulCurrentSequenceNumber +
|
|
pxSocket->u.xTCP.xTCPWindow.xSize.ulRxWindowLength ) != pdFALSE ) )
|
|
{
|
|
/* Send a challenge ACK. */
|
|
( void ) prvTCPSendChallengeAck( pxNetworkBuffer );
|
|
}
|
|
else
|
|
{
|
|
/* Nothing. */
|
|
}
|
|
}
|
|
|
|
/* Otherwise, do nothing. In any case, the packet cannot be handled. */
|
|
xResult = pdFAIL;
|
|
}
|
|
/* Check whether there is a pure SYN amongst the TCP flags while the connection is established. */
|
|
else if( ( ( ucTCPFlags & tcpTCP_FLAG_CTRL ) == tcpTCP_FLAG_SYN ) && ( pxSocket->u.xTCP.eTCPState >= eESTABLISHED ) )
|
|
{
|
|
/* SYN flag while this socket is already connected. */
|
|
FreeRTOS_debug_printf( ( "TCP: SYN unexpected from %xip:%u\n", ( unsigned ) ulRemoteIP, usRemotePort ) );
|
|
|
|
/* The packet cannot be handled. */
|
|
xResult = pdFAIL;
|
|
}
|
|
else
|
|
{
|
|
/* Update the copy of the TCP header only (skipping eth and IP
|
|
* headers). It might be used later on, whenever data must be sent
|
|
* to the peer. */
|
|
const size_t uxOffset = ipSIZE_OF_ETH_HEADER + uxIPHeaderSizeSocket( pxSocket );
|
|
( void ) memcpy( ( void * ) ( &( pxSocket->u.xTCP.xPacket.u.ucLastPacket[ uxOffset ] ) ),
|
|
( const void * ) ( &( pxNetworkBuffer->pucEthernetBuffer[ uxOffset ] ) ),
|
|
ipSIZE_OF_TCP_HEADER );
|
|
/* Clear flags that are set by the peer, and set the ACK flag. */
|
|
pxSocket->u.xTCP.xPacket.u.ucLastPacket[ uxOffset + ipTCP_FLAGS_OFFSET ] = tcpTCP_FLAG_ACK;
|
|
}
|
|
}
|
|
}
|
|
|
|
if( xResult != pdFAIL )
|
|
{
|
|
uint16_t usWindow;
|
|
|
|
/* pxSocket is not NULL when xResult != pdFAIL. */
|
|
configASSERT( pxSocket != NULL ); /* LCOV_EXCL_LINE ,this branch will not be hit*/
|
|
|
|
/* Touch the alive timers because we received a message for this
|
|
* socket. */
|
|
prvTCPTouchSocket( pxSocket );
|
|
|
|
/* Parse the TCP option(s), if present. */
|
|
|
|
/* _HT_ : if we're in the SYN phase, and peer does not send a MSS option,
|
|
* then we MUST assume an MSS size of 536 bytes for backward compatibility. */
|
|
|
|
/* When there are no TCP options, the TCP offset equals 20 bytes, which is stored as
|
|
* the number 5 (words) in the higher nibble of the TCP-offset byte. */
|
|
if( ( pxProtocolHeaders->xTCPHeader.ucTCPOffset & tcpTCP_OFFSET_LENGTH_BITS ) > tcpTCP_OFFSET_STANDARD_LENGTH )
|
|
{
|
|
xResult = prvCheckOptions( pxSocket, pxNetworkBuffer );
|
|
}
|
|
|
|
if( xResult != pdFAIL )
|
|
{
|
|
usWindow = FreeRTOS_ntohs( pxProtocolHeaders->xTCPHeader.usWindow );
|
|
pxSocket->u.xTCP.ulWindowSize = ( uint32_t ) usWindow;
|
|
#if ( ipconfigUSE_TCP_WIN == 1 )
|
|
{
|
|
/* rfc1323 : The Window field in a SYN (i.e., a <SYN> or <SYN,ACK>)
|
|
* segment itself is never scaled. */
|
|
if( ( ucTCPFlags & ( uint8_t ) tcpTCP_FLAG_SYN ) == 0U )
|
|
{
|
|
pxSocket->u.xTCP.ulWindowSize =
|
|
( pxSocket->u.xTCP.ulWindowSize << pxSocket->u.xTCP.ucPeerWinScaleFactor );
|
|
}
|
|
}
|
|
#endif /* ipconfigUSE_TCP_WIN */
|
|
|
|
/* In prvTCPHandleState() the incoming messages will be handled
|
|
* depending on the current state of the connection. */
|
|
if( prvTCPHandleState( pxSocket, &pxNetworkBuffer ) > 0 )
|
|
{
|
|
/* prvTCPHandleState() has sent a message, see if there are more to
|
|
* be transmitted. */
|
|
#if ( ipconfigUSE_TCP_WIN == 1 )
|
|
{
|
|
( void ) prvTCPSendRepeated( pxSocket, &pxNetworkBuffer );
|
|
}
|
|
#endif /* ipconfigUSE_TCP_WIN */
|
|
}
|
|
|
|
if( pxNetworkBuffer != NULL )
|
|
{
|
|
/* We must check if the buffer is unequal to NULL, because the
|
|
* socket might keep a reference to it in case a delayed ACK must be
|
|
* sent. */
|
|
vReleaseNetworkBufferAndDescriptor( pxNetworkBuffer );
|
|
#ifndef _lint
|
|
/* Clear pointers that are freed. */
|
|
pxNetworkBuffer = NULL;
|
|
#endif
|
|
}
|
|
|
|
/* And finally, calculate when this socket wants to be woken up. */
|
|
( void ) prvTCPNextTimeout( pxSocket );
|
|
}
|
|
}
|
|
}
|
|
|
|
/* pdPASS being returned means the buffer has been consumed. */
|
|
return xResult;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
|
|
/**
|
|
* @brief In the API accept(), the user asks is there is a new client? As API's can
|
|
* not walk through the xBoundTCPSocketsList the IP-task will do this.
|
|
*
|
|
* @param[in] pxSocket: The socket for which the bound socket list will be iterated.
|
|
*
|
|
* @return if there is a new client, then pdTRUE is returned or else, pdFALSE.
|
|
*/
|
|
BaseType_t xTCPCheckNewClient( FreeRTOS_Socket_t * pxSocket )
|
|
{
|
|
TickType_t uxLocalPort = ( TickType_t ) FreeRTOS_htons( pxSocket->usLocalPort );
|
|
const ListItem_t * pxIterator;
|
|
FreeRTOS_Socket_t * pxFound;
|
|
BaseType_t xResult = pdFALSE;
|
|
|
|
/* MISRA Ref 11.3.1 [Misaligned access] */
|
|
/* More details at: https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/blob/main/MISRA.md#rule-113 */
|
|
/* coverity[misra_c_2012_rule_11_3_violation] */
|
|
const ListItem_t * pxEndTCP = ( ( const ListItem_t * ) &( xBoundTCPSocketsList.xListEnd ) );
|
|
|
|
/* Here xBoundTCPSocketsList can be accessed safely IP-task is the only one
|
|
* who has access. */
|
|
for( pxIterator = ( const ListItem_t * ) listGET_HEAD_ENTRY( &xBoundTCPSocketsList );
|
|
pxIterator != pxEndTCP;
|
|
pxIterator = ( const ListItem_t * ) listGET_NEXT( pxIterator ) )
|
|
{
|
|
if( listGET_LIST_ITEM_VALUE( pxIterator ) == ( configLIST_VOLATILE TickType_t ) uxLocalPort )
|
|
{
|
|
pxFound = ( ( FreeRTOS_Socket_t * ) listGET_LIST_ITEM_OWNER( pxIterator ) );
|
|
|
|
if( ( pxFound->ucProtocol == ( uint8_t ) FREERTOS_IPPROTO_TCP ) && ( pxFound->u.xTCP.bits.bPassAccept != pdFALSE_UNSIGNED ) )
|
|
{
|
|
pxSocket->u.xTCP.pxPeerSocket = pxFound;
|
|
FreeRTOS_debug_printf( ( "xTCPCheckNewClient[0]: client on port %u\n", pxSocket->usLocalPort ) );
|
|
xResult = pdTRUE;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return xResult;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
|
|
#endif /* ipconfigUSE_TCP == 1 */
|
|
|
|
/* Provide access to private members for testing. */
|
|
#ifdef FREERTOS_ENABLE_UNIT_TESTS
|
|
#include "freertos_tcp_test_access_tcp_define.h"
|
|
#endif
|
|
|
|
/* Provide access to private members for verification. */
|
|
#ifdef FREERTOS_TCP_ENABLE_VERIFICATION
|
|
#include "aws_freertos_tcp_verification_access_tcp_define.h"
|
|
#endif
|