/* * FreeRTOS+TCP V3.1.0 * Copyright (C) 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved. * * SPDX-License-Identifier: MIT * * Permission is hereby granted, free of charge, to any person obtaining a copy of * this software and associated documentation files (the "Software"), to deal in * the Software without restriction, including without limitation the rights to * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of * the Software, and to permit persons to whom the Software is furnished to do so, * subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * * http://aws.amazon.com/freertos * http://www.FreeRTOS.org */ #include /* WinPCap includes. */ #define HAVE_REMOTE #include "pcap.h" /* FreeRTOS includes. */ #include "FreeRTOS.h" #include "task.h" #include "semphr.h" /* FreeRTOS+TCP includes. */ #include "FreeRTOS_IP.h" #include "FreeRTOS_IP_Private.h" #include "NetworkBufferManagement.h" /* Thread-safe circular buffers are being used to pass data to and from the PCAP * access functions. */ #include "Win32-Extensions.h" #include "FreeRTOS_Stream_Buffer.h" /* Sizes of the thread safe circular buffers used to pass data to and from the * WinPCAP Windows threads. */ #define xSEND_BUFFER_SIZE 32768 #define xRECV_BUFFER_SIZE 32768 /* If ipconfigETHERNET_DRIVER_FILTERS_FRAME_TYPES is set to 1, then the Ethernet * driver will filter incoming packets and only pass the stack those packets it * considers need processing. */ #if ( ipconfigETHERNET_DRIVER_FILTERS_FRAME_TYPES == 0 ) #define ipCONSIDER_FRAME_FOR_PROCESSING( pucEthernetBuffer ) eProcessBuffer #else #define ipCONSIDER_FRAME_FOR_PROCESSING( pucEthernetBuffer ) eConsiderFrameForProcessing( ( pucEthernetBuffer ) ) #endif /* Used to insert test code only. */ #define niDISRUPT_PACKETS 0 /*-----------------------------------------------------------*/ /* * Windows threads that are outside of the control of the FreeRTOS simulator are * used to interface with the WinPCAP libraries. */ DWORD WINAPI prvWinPcapRecvThread( void * pvParam ); DWORD WINAPI prvWinPcapSendThread( void * pvParam ); /* * Print out a numbered list of network interfaces that are available on the * host computer. */ static pcap_if_t * prvPrintAvailableNetworkInterfaces( void ); /* * Open the network interface. The number of the interface to be opened is set * by the configNETWORK_INTERFACE_TO_USE constant in FreeRTOSConfig.h. */ static void prvOpenSelectedNetworkInterface( pcap_if_t * pxAllNetworkInterfaces ); static int prvOpenInterface( const char * pucName ); /* * Configure the capture filter to allow blocking reads, and to filter out * packets that are not of interest to this demo. */ static void prvConfigureCaptureBehaviour( void ); /* * A function that simulates Ethernet interrupts by periodically polling the * WinPCap interface for new data. */ static void prvInterruptSimulatorTask( void * pvParameters ); /* * Create the buffers that are used to pass data between the FreeRTOS simulator * and the Win32 threads that manage WinPCAP. */ static void prvCreateThreadSafeBuffers( void ); /* * Utility function used to format print messages only. */ static const char * prvRemoveSpaces( char * pcBuffer, int aBuflen, const char * pcMessage ); /*-----------------------------------------------------------*/ /* Required by the WinPCap library. */ static char cErrorBuffer[ PCAP_ERRBUF_SIZE ]; /* An event used to wake up the Win32 thread that sends data through the WinPCAP * library. */ static void * pvSendEvent = NULL; /* _HT_ made the PCAP interface number configurable through the program's * parameters in order to test in different machines. */ static BaseType_t xConfigNetworkInterfaceToUse = configNETWORK_INTERFACE_TO_USE; /* Handles to the Windows threads that handle the PCAP IO. */ static HANDLE vWinPcapRecvThreadHandle = NULL; static HANDLE vWinPcapSendThreadHandle = NULL; /* The interface being used by WinPCap. */ static pcap_t * pxOpenedInterfaceHandle = NULL; /* Circular buffers used by the PCAP Win32 threads. */ static StreamBuffer_t * xSendBuffer = NULL; static StreamBuffer_t * xRecvBuffer = NULL; /* Logs the number of WinPCAP send failures, for viewing in the debugger only. */ static volatile uint32_t ulWinPCAPSendFailures = 0; /*-----------------------------------------------------------*/ BaseType_t xNetworkInterfaceInitialise( void ) { BaseType_t xReturn = pdFALSE; pcap_if_t * pxAllNetworkInterfaces; /* Query the computer the simulation is being executed on to find the * network interfaces it has installed. */ pxAllNetworkInterfaces = prvPrintAvailableNetworkInterfaces(); /* Open the network interface. The number of the interface to be opened is * set by the configNETWORK_INTERFACE_TO_USE constant in FreeRTOSConfig.h. * Calling this function will set the pxOpenedInterfaceHandle variable. If, * after calling this function, pxOpenedInterfaceHandle is equal to NULL, then * the interface could not be opened. */ if( pxAllNetworkInterfaces != NULL ) { prvOpenSelectedNetworkInterface( pxAllNetworkInterfaces ); } if( pxOpenedInterfaceHandle != NULL ) { xReturn = pdPASS; } return xReturn; } /*-----------------------------------------------------------*/ static void prvCreateThreadSafeBuffers( void ) { /* The buffer used to pass data to be transmitted from a FreeRTOS task to * the Win32 thread that sends via the WinPCAP library. */ if( xSendBuffer == NULL ) { xSendBuffer = ( StreamBuffer_t * ) malloc( sizeof( *xSendBuffer ) - sizeof( xSendBuffer->ucArray ) + xSEND_BUFFER_SIZE + 1 ); configASSERT( xSendBuffer ); memset( xSendBuffer, '\0', sizeof( *xSendBuffer ) - sizeof( xSendBuffer->ucArray ) ); xSendBuffer->LENGTH = xSEND_BUFFER_SIZE + 1; } /* The buffer used to pass received data from the Win32 thread that receives * via the WinPCAP library to the FreeRTOS task. */ if( xRecvBuffer == NULL ) { xRecvBuffer = ( StreamBuffer_t * ) malloc( sizeof( *xRecvBuffer ) - sizeof( xRecvBuffer->ucArray ) + xRECV_BUFFER_SIZE + 1 ); configASSERT( xRecvBuffer ); memset( xRecvBuffer, '\0', sizeof( *xRecvBuffer ) - sizeof( xRecvBuffer->ucArray ) ); xRecvBuffer->LENGTH = xRECV_BUFFER_SIZE + 1; } } /*-----------------------------------------------------------*/ BaseType_t xNetworkInterfaceOutput( NetworkBufferDescriptor_t * const pxNetworkBuffer, BaseType_t bReleaseAfterSend ) { size_t xSpace; iptraceNETWORK_INTERFACE_TRANSMIT(); configASSERT( xIsCallingFromIPTask() == pdTRUE ); /* Both the length of the data being sent and the actual data being sent * are placed in the thread safe buffer used to pass data between the FreeRTOS * tasks and the Win32 thread that sends data via the WinPCAP library. Drop * the packet if there is insufficient space in the buffer to hold both. */ xSpace = uxStreamBufferGetSpace( xSendBuffer ); if( ( pxNetworkBuffer->xDataLength <= ( ipconfigNETWORK_MTU + ipSIZE_OF_ETH_HEADER ) ) && ( xSpace >= ( pxNetworkBuffer->xDataLength + sizeof( pxNetworkBuffer->xDataLength ) ) ) ) { /* First write in the length of the data, then write in the data * itself. */ uxStreamBufferAdd( xSendBuffer, 0, ( const uint8_t * ) &( pxNetworkBuffer->xDataLength ), sizeof( pxNetworkBuffer->xDataLength ) ); uxStreamBufferAdd( xSendBuffer, 0, ( const uint8_t * ) pxNetworkBuffer->pucEthernetBuffer, pxNetworkBuffer->xDataLength ); } else { FreeRTOS_debug_printf( ( "xNetworkInterfaceOutput: send buffers full to store %lu\n", pxNetworkBuffer->xDataLength ) ); } /* Kick the Tx task in either case in case it doesn't know the buffer is * full. */ SetEvent( pvSendEvent ); /* The buffer has been sent so can be released. */ if( bReleaseAfterSend != pdFALSE ) { vReleaseNetworkBufferAndDescriptor( pxNetworkBuffer ); } return pdPASS; } /*-----------------------------------------------------------*/ static pcap_if_t * prvPrintAvailableNetworkInterfaces( void ) { pcap_if_t * pxAllNetworkInterfaces = NULL, * xInterface; int32_t lInterfaceNumber = 1; char cBuffer[ 512 ]; static BaseType_t xInvalidInterfaceDetected = pdFALSE; if( xInvalidInterfaceDetected == pdFALSE ) { if( pcap_findalldevs_ex( PCAP_SRC_IF_STRING, NULL, &pxAllNetworkInterfaces, cErrorBuffer ) == -1 ) { printf( "Could not obtain a list of network interfaces\n%s\n", cErrorBuffer ); pxAllNetworkInterfaces = NULL; } else { printf( "\r\n\r\nThe following network interfaces are available:\r\n\r\n" ); } if( pxAllNetworkInterfaces != NULL ) { /* Print out the list of network interfaces. The first in the list * is interface '1', not interface '0'. */ for( xInterface = pxAllNetworkInterfaces; xInterface != NULL; xInterface = xInterface->next ) { /* The descriptions of the devices can be full of spaces, clean them * a little. printf() can only be used here because the network is not * up yet - so no other network tasks will be running. */ printf( "Interface %d - %s\n", lInterfaceNumber, prvRemoveSpaces( cBuffer, sizeof( cBuffer ), xInterface->name ) ); printf( " (%s)\n", prvRemoveSpaces( cBuffer, sizeof( cBuffer ), xInterface->description ? xInterface->description : "No description" ) ); printf( "\n" ); lInterfaceNumber++; } } if( lInterfaceNumber == 1 ) { /* The interface number was never incremented, so the above for() loop * did not execute meaning no interfaces were found. */ printf( " \nNo network interfaces were found.\n" ); pxAllNetworkInterfaces = NULL; } printf( "\r\nThe interface that will be opened is set by " ); printf( "\"configNETWORK_INTERFACE_TO_USE\", which\r\nshould be defined in FreeRTOSConfig.h\r\n" ); if( ( xConfigNetworkInterfaceToUse < 1L ) || ( xConfigNetworkInterfaceToUse >= lInterfaceNumber ) ) { printf( "\r\nERROR: configNETWORK_INTERFACE_TO_USE is set to %d, which is an invalid value.\r\n", xConfigNetworkInterfaceToUse ); printf( "Please set configNETWORK_INTERFACE_TO_USE to one of the interface numbers listed above,\r\n" ); printf( "then re-compile and re-start the application. Only Ethernet (as opposed to WiFi)\r\n" ); printf( "interfaces are supported.\r\n\r\nHALTING\r\n\r\n\r\n" ); xInvalidInterfaceDetected = pdTRUE; if( pxAllNetworkInterfaces != NULL ) { /* Free the device list, as no devices are going to be opened. */ pcap_freealldevs( pxAllNetworkInterfaces ); pxAllNetworkInterfaces = NULL; } } else { printf( "Attempting to open interface number %d.\n", xConfigNetworkInterfaceToUse ); } } return pxAllNetworkInterfaces; } /*-----------------------------------------------------------*/ static int prvOpenInterface( const char * pucName ) { static char pucInterfaceName[ 256 ]; if( pucName != NULL ) { strncpy( pucInterfaceName, pucName, sizeof( pucInterfaceName ) ); } pxOpenedInterfaceHandle = pcap_open( pucInterfaceName, /* The name of the selected interface. */ ipTOTAL_ETHERNET_FRAME_SIZE, /* The size of the packet to capture. */ PCAP_OPENFLAG_PROMISCUOUS, /* Open in promiscuous mode as the MAC and * IP address is going to be "simulated", and * not be the real MAC and IP address. This allows * traffic to the simulated IP address to be routed * to uIP, and traffic to the real IP address to be * routed to the Windows TCP/IP stack. */ 100, NULL, /* No authentication is required as this is * not a remote capture session. */ cErrorBuffer ); if( pxOpenedInterfaceHandle == NULL ) { printf( "\n%s is not supported by WinPcap and cannot be opened\n", pucInterfaceName ); return 1; } else { /* Configure the capture filter to allow blocking reads, and to filter * out packets that are not of interest to this demo. */ prvConfigureCaptureBehaviour(); } return 0; } /*-----------------------------------------------------------*/ static void prvOpenSelectedNetworkInterface( pcap_if_t * pxAllNetworkInterfaces ) { pcap_if_t * pxInterface; int32_t x; /* Walk the list of devices until the selected device is located. */ pxInterface = pxAllNetworkInterfaces; for( x = 0L; x < ( xConfigNetworkInterfaceToUse - 1L ); x++ ) { pxInterface = pxInterface->next; } /* Open the selected interface. */ if( prvOpenInterface( pxInterface->name ) == 0 ) { printf( "Successfully opened interface number %d.\n", x + 1 ); } else { printf( "Failed to open interface number %d.\n", x + 1 ); } /* The device list is no longer required. */ pcap_freealldevs( pxAllNetworkInterfaces ); } /*-----------------------------------------------------------*/ static void prvConfigureCaptureBehaviour( void ) { struct bpf_program xFilterCode; uint32_t ulNetMask; /* Set up a filter so only the packets of interest are passed to the IP * stack. cErrorBuffer is used for convenience to create the string. Don't * confuse this with an error message. */ sprintf( cErrorBuffer, "broadcast or multicast or ether host %x:%x:%x:%x:%x:%x", ipLOCAL_MAC_ADDRESS[ 0 ], ipLOCAL_MAC_ADDRESS[ 1 ], ipLOCAL_MAC_ADDRESS[ 2 ], ipLOCAL_MAC_ADDRESS[ 3 ], ipLOCAL_MAC_ADDRESS[ 4 ], ipLOCAL_MAC_ADDRESS[ 5 ] ); ulNetMask = ( configNET_MASK3 << 24UL ) | ( configNET_MASK2 << 16UL ) | ( configNET_MASK1 << 8L ) | configNET_MASK0; if( pcap_compile( pxOpenedInterfaceHandle, &xFilterCode, cErrorBuffer, 1, ulNetMask ) < 0 ) { printf( "\nThe packet filter string is invalid\n" ); } else { if( pcap_setfilter( pxOpenedInterfaceHandle, &xFilterCode ) < 0 ) { printf( "\nAn error occurred setting the packet filter.\n" ); } /* When pcap_compile() succeeds, it allocates memory for the memory pointed to by the bpf_program struct * parameter.pcap_freecode() will free that memory. */ pcap_freecode( &xFilterCode ); } /* Create the buffers used to pass packets between the FreeRTOS simulator * and the Win32 threads that are handling WinPCAP. */ prvCreateThreadSafeBuffers(); if( pvSendEvent == NULL ) { /* Create event used to signal the Win32 WinPCAP Tx thread. */ pvSendEvent = CreateEvent( NULL, FALSE, TRUE, NULL ); /* Create the Win32 thread that handles WinPCAP Rx. */ vWinPcapRecvThreadHandle = CreateThread( NULL, /* Pointer to thread security attributes. */ 0, /* Initial thread stack size, in bytes. */ prvWinPcapRecvThread, /* Pointer to thread function. */ NULL, /* Argument for new thread. */ 0, /* Creation flags. */ NULL ); /* Use the cores that are not used by the FreeRTOS tasks. */ SetThreadAffinityMask( vWinPcapRecvThreadHandle, ~0x01u ); /* Create the Win32 thread that handlers WinPCAP Tx. */ vWinPcapSendThreadHandle = CreateThread( NULL, /* Pointer to thread security attributes. */ 0, /* initial thread stack size, in bytes. */ prvWinPcapSendThread, /* Pointer to thread function. */ NULL, /* Argument for new thread. */ 0, /* Creation flags. */ NULL ); /* Use the cores that are not used by the FreeRTOS tasks. */ SetThreadAffinityMask( vWinPcapSendThreadHandle, ~0x01u ); /* Create a task that simulates an interrupt in a real system. This will * block waiting for packets, then send a message to the IP task when data * is available. */ xTaskCreate( prvInterruptSimulatorTask, "MAC_ISR", configMINIMAL_STACK_SIZE, NULL, configMAC_ISR_SIMULATOR_PRIORITY, NULL ); } } /*-----------------------------------------------------------*/ /* WinPCAP function. */ void pcap_callback( u_char * user, const struct pcap_pkthdr * pkt_header, const u_char * pkt_data ) { ( void ) user; /* THIS IS CALLED FROM A WINDOWS THREAD - DO NOT ATTEMPT ANY FREERTOS CALLS * OR TO PRINT OUT MESSAGES HERE. */ /* Pass data to the FreeRTOS simulator on a thread safe circular buffer. */ if( ( pkt_header->caplen <= ( ipconfigNETWORK_MTU + ipSIZE_OF_ETH_HEADER ) ) && ( uxStreamBufferGetSpace( xRecvBuffer ) >= ( ( ( size_t ) pkt_header->caplen ) + sizeof( *pkt_header ) ) ) ) { /* The received packets will be written to a C source file, * only if 'ipconfigUSE_DUMP_PACKETS' is defined. * Otherwise, there is no action. */ iptraceDUMP_PACKET( ( const uint8_t * ) pkt_data, ( size_t ) pkt_header->caplen, pdTRUE ); uxStreamBufferAdd( xRecvBuffer, 0, ( const uint8_t * ) pkt_header, sizeof( *pkt_header ) ); uxStreamBufferAdd( xRecvBuffer, 0, ( const uint8_t * ) pkt_data, ( size_t ) pkt_header->caplen ); } } /*-----------------------------------------------------------*/ DWORD WINAPI prvWinPcapRecvThread( void * pvParam ) { ( void ) pvParam; /* THIS IS A WINDOWS THREAD - DO NOT ATTEMPT ANY FREERTOS CALLS OR TO PRINT * OUT MESSAGES HERE. */ for( ; ; ) { pcap_dispatch( pxOpenedInterfaceHandle, 1, pcap_callback, ( u_char * ) "mydata" ); } } /*-----------------------------------------------------------*/ DWORD WINAPI prvWinPcapSendThread( void * pvParam ) { size_t xLength; uint8_t ucBuffer[ ipconfigNETWORK_MTU + ipSIZE_OF_ETH_HEADER ]; static char cErrorMessage[ 1024 ]; const DWORD xMaxMSToWait = 1000; /* THIS IS A WINDOWS THREAD - DO NOT ATTEMPT ANY FREERTOS CALLS OR TO PRINT * OUT MESSAGES HERE. */ /* Remove compiler warnings about unused parameters. */ ( void ) pvParam; for( ; ; ) { /* Wait until notified of something to send. */ WaitForSingleObject( pvSendEvent, xMaxMSToWait ); /* Is there more than the length value stored in the circular buffer * used to pass data from the FreeRTOS simulator into this Win32 thread? */ while( uxStreamBufferGetSize( xSendBuffer ) > sizeof( xLength ) ) { uxStreamBufferGet( xSendBuffer, 0, ( uint8_t * ) &xLength, sizeof( xLength ), pdFALSE ); uxStreamBufferGet( xSendBuffer, 0, ( uint8_t * ) ucBuffer, xLength, pdFALSE ); /* The packets sent will be written to a C source file, * only if 'ipconfigUSE_DUMP_PACKETS' is defined. * Otherwise, there is no action. */ iptraceDUMP_PACKET( ucBuffer, xLength, pdFALSE ); if( pcap_sendpacket( pxOpenedInterfaceHandle, ucBuffer, xLength ) != 0 ) { ulWinPCAPSendFailures++; } } } } /*-----------------------------------------------------------*/ static BaseType_t xPacketBouncedBack( const uint8_t * pucBuffer ) { EthernetHeader_t * pxEtherHeader; BaseType_t xResult; pxEtherHeader = ( EthernetHeader_t * ) pucBuffer; /* Sometimes, packets are bounced back by the driver and we need not process them. Check * whether this packet is one such packet. */ if( memcmp( ipLOCAL_MAC_ADDRESS, pxEtherHeader->xSourceAddress.ucBytes, ipMAC_ADDRESS_LENGTH_BYTES ) == 0 ) { xResult = pdTRUE; } else { xResult = pdFALSE; } return xResult; } /*-----------------------------------------------------------*/ static void prvInterruptSimulatorTask( void * pvParameters ) { struct pcap_pkthdr xHeader; static struct pcap_pkthdr * pxHeader; const uint8_t * pucPacketData; uint8_t ucRecvBuffer[ ipconfigNETWORK_MTU + ipSIZE_OF_ETH_HEADER ]; NetworkBufferDescriptor_t * pxNetworkBuffer; IPStackEvent_t xRxEvent = { eNetworkRxEvent, NULL }; eFrameProcessingResult_t eResult; /* Remove compiler warnings about unused parameters. */ ( void ) pvParameters; for( ; ; ) { /* Does the circular buffer used to pass data from the Win32 thread that * handles WinPCAP Rx into the FreeRTOS simulator contain another packet? */ if( uxStreamBufferGetSize( xRecvBuffer ) > sizeof( xHeader ) ) { /* Get the next packet. */ uxStreamBufferGet( xRecvBuffer, 0, ( uint8_t * ) &xHeader, sizeof( xHeader ), pdFALSE ); uxStreamBufferGet( xRecvBuffer, 0, ( uint8_t * ) ucRecvBuffer, ( size_t ) xHeader.len, pdFALSE ); pucPacketData = ucRecvBuffer; pxHeader = &xHeader; iptraceNETWORK_INTERFACE_RECEIVE(); /* Check for minimal size. */ if( pxHeader->len >= sizeof( EthernetHeader_t ) ) { eResult = ipCONSIDER_FRAME_FOR_PROCESSING( pucPacketData ); } else { eResult = eReleaseBuffer; } if( eResult == eProcessBuffer ) { /* Will the data fit into the frame buffer? */ if( pxHeader->len <= ipTOTAL_ETHERNET_FRAME_SIZE ) { /* Obtain a buffer into which the data can be placed. This * is only an interrupt simulator, not a real interrupt, so it * is ok to call the task level function here, but note that * some buffer implementations cannot be called from a real * interrupt. */ if( xPacketBouncedBack( pucPacketData ) == pdFALSE ) { pxNetworkBuffer = pxGetNetworkBufferWithDescriptor( pxHeader->len, 0 ); } else { pxNetworkBuffer = NULL; } if( pxNetworkBuffer != NULL ) { memcpy( pxNetworkBuffer->pucEthernetBuffer, pucPacketData, pxHeader->len ); pxNetworkBuffer->xDataLength = ( size_t ) pxHeader->len; #if ( niDISRUPT_PACKETS == 1 ) { pxNetworkBuffer = vRxFaultInjection( pxNetworkBuffer, pucPacketData ); } #endif /* niDISRUPT_PACKETS */ if( pxNetworkBuffer != NULL ) { xRxEvent.pvData = ( void * ) pxNetworkBuffer; /* Data was received and stored. Send a message to * the IP task to let it know. */ if( xSendEventStructToIPTask( &xRxEvent, ( TickType_t ) 0 ) == pdFAIL ) { /* The buffer could not be sent to the stack so * must be released again. This is only an * interrupt simulator, not a real interrupt, so it * is ok to use the task level function here, but * note no all buffer implementations will allow * this function to be executed from a real * interrupt. */ vReleaseNetworkBufferAndDescriptor( pxNetworkBuffer ); iptraceETHERNET_RX_EVENT_LOST(); } } else { /* The packet was already released or stored inside * vRxFaultInjection(). Don't release it here. */ } } else { iptraceETHERNET_RX_EVENT_LOST(); } } else { /* Log that a packet was dropped because it would have * overflowed the buffer, but there may be more buffers to * process. */ } } } else { /* There is no real way of simulating an interrupt. Make sure * other tasks can run. */ vTaskDelay( configWINDOWS_MAC_INTERRUPT_SIMULATOR_DELAY ); } } } /*-----------------------------------------------------------*/ static const char * prvRemoveSpaces( char * pcBuffer, int aBuflen, const char * pcMessage ) { char * pcTarget = pcBuffer; /* Utility function used to format messages being printed only. */ while( ( *pcMessage != 0 ) && ( pcTarget < ( pcBuffer + aBuflen - 1 ) ) ) { *( pcTarget++ ) = *pcMessage; if( isspace( *pcMessage ) != pdFALSE ) { while( isspace( *pcMessage ) != pdFALSE ) { pcMessage++; } } else { pcMessage++; } } *pcTarget = '\0'; return pcBuffer; } #define BUFFER_SIZE ( ipTOTAL_ETHERNET_FRAME_SIZE + ipBUFFER_PADDING ) #define BUFFER_SIZE_ROUNDED_UP ( ( BUFFER_SIZE + 7 ) & ~0x07UL ) void vNetworkInterfaceAllocateRAMToBuffers( NetworkBufferDescriptor_t pxNetworkBuffers[ ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS ] ) { static uint8_t * pucNetworkPacketBuffers = NULL; size_t uxIndex; if( pucNetworkPacketBuffers == NULL ) { pucNetworkPacketBuffers = ( uint8_t * ) malloc( ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS * BUFFER_SIZE_ROUNDED_UP ); } if( pucNetworkPacketBuffers == NULL ) { FreeRTOS_printf( ( "Failed to allocate memory for pxNetworkBuffers" ) ); configASSERT( 0 ); } else { for( uxIndex = 0; uxIndex < ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS; uxIndex++ ) { size_t uxOffset = uxIndex * BUFFER_SIZE_ROUNDED_UP; NetworkBufferDescriptor_t ** ppDescriptor; /* At the beginning of each pbuff is a pointer to the relevant descriptor */ ppDescriptor = ( NetworkBufferDescriptor_t ** ) &( pucNetworkPacketBuffers[ uxOffset ] ); /* Set this pointer to the address of the correct descriptor */ *ppDescriptor = &( pxNetworkBuffers[ uxIndex ] ); /* pucEthernetBuffer is set to point ipBUFFER_PADDING bytes in from the * beginning of the allocated buffer. */ pxNetworkBuffers[ uxIndex ].pucEthernetBuffer = &( pucNetworkPacketBuffers[ uxOffset + ipBUFFER_PADDING ] ); } } }