mirror of
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP
synced 2025-10-24 12:02:37 +08:00
a6ca0be209
Libslirp is used by qemu to provide userspace NAT networking. This serves as a replacement for the current libpcap / winpcap NetworkInterface but does not require elevated privileges or selecting a particular interface to bind to. In this implementation, incoming connections are not supported. Tested with git revision 38638382c8f3dc2523468f0c54014f4fdf0aa38f on MacOS and Windows.
293 lines
9.5 KiB
C
293 lines
9.5 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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/* FreeRTOS includes. */
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#include "FreeRTOS.h"
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#include "list.h"
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#include "task.h"
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#include "message_buffer.h"
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#if !defined( _WIN32 )
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#include "wait_for_event.h"
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#endif
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/* FreeRTOS+TCP includes. */
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#include "FreeRTOS_IP.h"
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/* If ipconfigETHERNET_DRIVER_FILTERS_FRAME_TYPES is set to 1, then the Ethernet
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* driver will filter incoming packets and only pass the stack those packets it
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* considers need processing. */
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#if ( ipconfigETHERNET_DRIVER_FILTERS_FRAME_TYPES == 0 )
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#define ipCONSIDER_FRAME_FOR_PROCESSING( pucEthernetBuffer ) eProcessBuffer
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#else
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#define ipCONSIDER_FRAME_FOR_PROCESSING( pucEthernetBuffer ) eConsiderFrameForProcessing( ( pucEthernetBuffer ) )
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#endif
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#if ipconfigNETWORK_MTU < 1500U
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#error ipconfigNETWORK_MTU must be at least 1500
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#endif
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#define NETWORK_BUFFER_LEN ( ipconfigNETWORK_MTU + ipSIZE_OF_ETH_HEADER )
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#define xSEND_BUFFER_SIZE ( 32U * NETWORK_BUFFER_LEN )
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#define xRECV_BUFFER_SIZE ( 32U * NETWORK_BUFFER_LEN )
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typedef struct
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{
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BaseType_t xInterfaceState;
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MessageBufferHandle_t xSendMsgBuffer;
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MessageBufferHandle_t xRecvMsgBuffer;
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TaskHandle_t xRecvTask;
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void * pvSendEvent;
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void * pvBackendContext;
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} MBuffNetDriverContext_t;
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extern void vMBuffNetifBackendInit( MessageBufferHandle_t * pxSendMsgBuffer,
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MessageBufferHandle_t * pxRecvMsgBuffer,
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void * pvSendEvent,
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void ** ppvBackendContext );
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extern void vMBuffNetifBackendDeInit( void * pvBackendContext );
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static void vNetifReceiveTask( void * pvParameters );
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MBuffNetDriverContext_t xDriverCtx = { 0 };
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/**
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* @brief Initialize the MessageBuffer backed network interface.
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*
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* @return BaseType_t pdTRUE on success
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*/
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BaseType_t xNetworkInterfaceInitialise( void )
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{
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BaseType_t xResult = pdTRUE;
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if( xDriverCtx.xInterfaceState == pdFALSE )
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{
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xDriverCtx.xInterfaceState = pdFALSE;
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#if defined( _WIN32 )
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xDriverCtx.pvSendEvent = CreateEvent( NULL, FALSE, TRUE, NULL );
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#else
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xDriverCtx.pvSendEvent = ( void * ) event_create();
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#endif
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if( xDriverCtx.pvSendEvent == NULL )
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{
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xResult = pdFALSE;
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}
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else
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{
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vMBuffNetifBackendInit( &( xDriverCtx.xSendMsgBuffer ),
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&( xDriverCtx.xRecvMsgBuffer ),
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xDriverCtx.pvSendEvent,
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&( xDriverCtx.pvBackendContext ) );
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if( xDriverCtx.pvBackendContext == NULL )
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{
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xResult = pdFALSE;
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#if defined( _WIN32 )
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( void ) CloseHandle( xDriverCtx.pvSendEvent );
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#else
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( void ) event_delete( xDriverCtx.pvSendEvent );
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#endif
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}
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}
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if( xResult == pdTRUE )
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{
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xResult = xTaskCreate( vNetifReceiveTask, "NetRX",
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configMINIMAL_STACK_SIZE, NULL,
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tskIDLE_PRIORITY,
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&( xDriverCtx.xRecvTask ) );
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}
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/* Cleanup on failure */
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if( xResult != pdTRUE )
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{
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if( xDriverCtx.pvSendEvent != NULL )
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{
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#if defined( _WIN32 )
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( void ) CloseHandle( xDriverCtx.pvSendEvent );
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#else
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event_delete( xDriverCtx.pvSendEvent );
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#endif
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}
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if( xDriverCtx.pvBackendContext != NULL )
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{
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vMBuffNetifBackendDeInit( xDriverCtx.pvBackendContext );
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}
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}
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xDriverCtx.xInterfaceState = xResult;
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}
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return xResult;
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}
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/**
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* @brief Deinitialize the message buffer backed network interface.
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*
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* @return BaseType_t pdTRUE
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*/
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BaseType_t xNetworkInterfaceDeInitialise( void )
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{
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#if defined( _WIN32 )
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( void ) CloseHandle( xDriverCtx.pvSendEvent );
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#else
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event_delete( xDriverCtx.pvSendEvent );
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#endif
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vTaskDelete( xDriverCtx.xRecvTask );
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return pdTRUE;
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}
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/*!
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* @brief FreeRTOS task which reads from xRecvMsgBuffer and passes new frames to FreeRTOS+TCP.
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* @param [in] pvParameters not used
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*/
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static void vNetifReceiveTask( void * pvParameters )
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{
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NetworkBufferDescriptor_t * pxDescriptor = NULL;
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( void ) pvParameters;
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for( ; ; )
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{
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size_t uxMessageLen;
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while( pxDescriptor == NULL )
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{
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/* Wait for an MTU + header sized buffer */
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pxDescriptor = pxGetNetworkBufferWithDescriptor( NETWORK_BUFFER_LEN, portMAX_DELAY );
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configASSERT( pxDescriptor->xDataLength >= NETWORK_BUFFER_LEN );
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}
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/* Read an incoming frame */
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uxMessageLen = xMessageBufferReceive( xDriverCtx.xRecvMsgBuffer,
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pxDescriptor->pucEthernetBuffer,
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pxDescriptor->xDataLength,
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portMAX_DELAY );
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if( uxMessageLen > 0 )
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{
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IPStackEvent_t xRxEvent;
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eFrameProcessingResult_t xFrameProcess;
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pxDescriptor->xDataLength = uxMessageLen;
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/* eConsiderFrameForProcessing is interrupt safe */
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xFrameProcess = ipCONSIDER_FRAME_FOR_PROCESSING( pxDescriptor->pucEthernetBuffer );
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if( xFrameProcess != eProcessBuffer )
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{
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FreeRTOS_debug_printf( ( "Dropping RX frame of length: %lu. eConsiderFrameForProcessing returned %lu.\n",
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uxMessageLen, xFrameProcess ) );
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}
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xRxEvent.eEventType = eNetworkRxEvent;
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xRxEvent.pvData = ( void * ) pxDescriptor;
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if( xSendEventStructToIPTask( &xRxEvent, 0U ) == pdTRUE )
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{
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iptraceNETWORK_INTERFACE_RECEIVE();
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/* Clear pxDescriptor so that the task requests a new buffer */
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pxDescriptor = NULL;
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}
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else
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{
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FreeRTOS_debug_printf( ( "Dropping TX frame of length: %lu. FreeRTOS+TCP event queue is full.\n",
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pxDescriptor->xDataLength ) );
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/* Drop the frame and reuse the descriptor for the next incomming frame */
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iptraceETHERNET_RX_EVENT_LOST();
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}
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}
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else
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{
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/*
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* xMessageBufferReceive returned zero.
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*/
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}
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}
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}
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/*!
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* @brief API call, called from reeRTOS_IP.c to send a network packet over the
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* selected interface
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* @return pdTRUE if successful else pdFALSE
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*/
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BaseType_t xNetworkInterfaceOutput( NetworkBufferDescriptor_t * const pxNetworkBuffer,
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BaseType_t xReleaseAfterSend )
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{
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BaseType_t xResult = pdFALSE;
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configASSERT( pxNetworkBuffer != NULL );
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configASSERT( pxNetworkBuffer->pucEthernetBuffer != NULL );
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configASSERT( pxNetworkBuffer->xDataLength >= sizeof( EthernetHeader_t ) );
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if( xDriverCtx.xInterfaceState == pdTRUE )
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{
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if( xMessageBufferSpacesAvailable( xDriverCtx.xSendMsgBuffer ) > pxNetworkBuffer->xDataLength + 4U )
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{
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size_t uxBytesSent;
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uxBytesSent = xMessageBufferSend( xDriverCtx.xSendMsgBuffer,
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pxNetworkBuffer->pucEthernetBuffer,
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pxNetworkBuffer->xDataLength,
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0U );
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( void ) uxBytesSent;
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configASSERT( uxBytesSent == pxNetworkBuffer->xDataLength );
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xResult = pdTRUE;
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}
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else
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{
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FreeRTOS_debug_printf( ( "Dropping TX frame of length: %lu. xSendMsgBuffer is full.\n",
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pxNetworkBuffer->xDataLength ) );
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}
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iptraceNETWORK_INTERFACE_TRANSMIT();
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if( xReleaseAfterSend != pdFALSE )
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{
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vReleaseNetworkBufferAndDescriptor( pxNetworkBuffer );
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}
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if( xResult == pdTRUE )
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{
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#if defined( _WIN32 )
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SetEvent( xDriverCtx.pvSendEvent );
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#else
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event_signal( xDriverCtx.pvSendEvent );
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#endif
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}
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}
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return xResult;
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}
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