mirror of
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP
synced 2025-10-22 16:37:41 +08:00
a4124602cc
This commit brings in the refactoring and restructuring changes from IntegrationTesting1 branch to the main branch. It also includes additional unit tests for 100% coverage. The rationale behind not creating a PR is that the conflicts were too huge to be resolved correctly. Thus, a force push to the main branch is being done.
1286 lines
45 KiB
C
1286 lines
45 KiB
C
/*
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* FreeRTOS+TCP V2.3.4
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* Copyright (C) 2021 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_IP_Utils.c
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* @brief Implements the basic functionality for the FreeRTOS+TCP network stack.
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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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#include <string.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_IP_Utils.h"
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#include "FreeRTOS_IP_Timers.h"
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#include "FreeRTOS_Sockets.h"
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#include "FreeRTOS_IP_Private.h"
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#include "FreeRTOS_ARP.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_DNS.h"
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/* Used to ensure the structure packing is having the desired effect. The
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* 'volatile' is used to prevent compiler warnings about comparing a constant with
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* a constant. */
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#ifndef _lint
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#define ipEXPECTED_EthernetHeader_t_SIZE ( ( size_t ) 14 ) /**< Ethernet Header size in bytes. */
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#define ipEXPECTED_ARPHeader_t_SIZE ( ( size_t ) 28 ) /**< ARP header size in bytes. */
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#define ipEXPECTED_IPHeader_t_SIZE ( ( size_t ) 20 ) /**< IP header size in bytes. */
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#define ipEXPECTED_IGMPHeader_t_SIZE ( ( size_t ) 8 ) /**< IGMP header size in bytes. */
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#define ipEXPECTED_ICMPHeader_t_SIZE ( ( size_t ) 8 ) /**< ICMP header size in bytes. */
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#define ipEXPECTED_UDPHeader_t_SIZE ( ( size_t ) 8 ) /**< UDP header size in bytes. */
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#define ipEXPECTED_TCPHeader_t_SIZE ( ( size_t ) 20 ) /**< TCP header size in bytes. */
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#endif
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/** @brief Time delay between repeated attempts to initialise the network hardware. */
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#ifndef ipINITIALISATION_RETRY_DELAY
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#define ipINITIALISATION_RETRY_DELAY ( pdMS_TO_TICKS( 3000U ) )
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#endif
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extern QueueHandle_t xNetworkEventQueue;
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#if ( ipconfigUSE_NETWORK_EVENT_HOOK == 1 )
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static BaseType_t xCallEventHook = pdFALSE;
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#endif
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#if ( ipconfigHAS_PRINTF != 0 )
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/** @brief Last value of minimum buffer count. */
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static UBaseType_t uxLastMinBufferCount = ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS;
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/** @brief Last value of minimum size. Used in printing resource stats. */
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static size_t uxMinLastSize = 0u;
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#endif
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#if ( ipconfigCHECK_IP_QUEUE_SPACE != 0 )
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static UBaseType_t uxLastMinQueueSpace = 0;
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#endif
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/**
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* Used in checksum calculation.
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*/
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typedef union _xUnion32
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{
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uint32_t u32; /**< The 32-bit member of the union. */
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uint16_t u16[ 2 ]; /**< The array of 2 16-bit members of the union. */
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uint8_t u8[ 4 ]; /**< The array of 4 8-bit members of the union. */
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} xUnion32;
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/**
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* Used in checksum calculation.
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*/
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typedef union _xUnionPtr
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{
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uint32_t * u32ptr; /**< The pointer member to a 32-bit variable. */
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uint16_t * u16ptr; /**< The pointer member to a 16-bit variable. */
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uint8_t * u8ptr; /**< The pointer member to an 8-bit variable. */
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} xUnionPtr;
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/*
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* Returns the network buffer descriptor that owns a given packet buffer.
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*/
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static NetworkBufferDescriptor_t * prvPacketBuffer_to_NetworkBuffer( const void * pvBuffer,
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size_t uxOffset );
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#if ( ipconfigUSE_DHCP != 0 )
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/**
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* @brief Create a DHCP event.
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*
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* @return pdPASS or pdFAIL, depending on whether xSendEventStructToIPTask()
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* succeeded.
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*/
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BaseType_t xSendDHCPEvent( void )
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{
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IPStackEvent_t xEventMessage;
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const TickType_t uxDontBlock = 0U;
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uintptr_t uxOption = eGetDHCPState();
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xEventMessage.eEventType = eDHCPEvent;
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xEventMessage.pvData = ( void * ) uxOption;
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return xSendEventStructToIPTask( &xEventMessage, uxDontBlock );
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}
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/*-----------------------------------------------------------*/
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#endif /* ( ipconfigUSE_DHCP != 0 ) */
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/**
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* @brief Set multicast MAC address.
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*
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* @param[in] ulIPAddress: IP address.
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* @param[out] pxMACAddress: Pointer to MAC address.
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*/
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void vSetMultiCastIPv4MacAddress( uint32_t ulIPAddress,
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MACAddress_t * pxMACAddress )
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{
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uint32_t ulIP = FreeRTOS_ntohl( ulIPAddress );
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pxMACAddress->ucBytes[ 0 ] = ( uint8_t ) 0x01U;
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pxMACAddress->ucBytes[ 1 ] = ( uint8_t ) 0x00U;
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pxMACAddress->ucBytes[ 2 ] = ( uint8_t ) 0x5EU;
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pxMACAddress->ucBytes[ 3 ] = ( uint8_t ) ( ( ulIP >> 16 ) & 0x7fU ); /* Use 7 bits. */
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pxMACAddress->ucBytes[ 4 ] = ( uint8_t ) ( ( ulIP >> 8 ) & 0xffU ); /* Use 8 bits. */
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pxMACAddress->ucBytes[ 5 ] = ( uint8_t ) ( ( ulIP ) & 0xffU ); /* Use 8 bits. */
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}
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/*-----------------------------------------------------------*/
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/**
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* @brief Duplicate the given network buffer descriptor with a modified length.
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*
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* @param[in] pxNetworkBuffer: The network buffer to be duplicated.
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* @param[in] uxNewLength: The length for the new buffer.
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*
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* @return If properly duplicated, then the duplicate network buffer or else, NULL.
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*/
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NetworkBufferDescriptor_t * pxDuplicateNetworkBufferWithDescriptor( const NetworkBufferDescriptor_t * const pxNetworkBuffer,
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size_t uxNewLength )
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{
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NetworkBufferDescriptor_t * pxNewBuffer;
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size_t uxLengthToCopy = uxNewLength;
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/* This function is only used when 'ipconfigZERO_COPY_TX_DRIVER' is set to 1.
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* The transmit routine wants to have ownership of the network buffer
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* descriptor, because it will pass the buffer straight to DMA. */
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pxNewBuffer = pxGetNetworkBufferWithDescriptor( uxNewLength, ( TickType_t ) 0 );
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if( pxNewBuffer != NULL )
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{
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/* Get the minimum of both values to copy the data. */
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if( uxLengthToCopy > pxNetworkBuffer->xDataLength )
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{
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uxLengthToCopy = pxNetworkBuffer->xDataLength;
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}
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/* Set the actual packet size in case a bigger buffer than requested
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* was returned. */
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pxNewBuffer->xDataLength = uxNewLength;
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/* Copy the original packet information. */
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pxNewBuffer->ulIPAddress = pxNetworkBuffer->ulIPAddress;
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pxNewBuffer->usPort = pxNetworkBuffer->usPort;
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pxNewBuffer->usBoundPort = pxNetworkBuffer->usBoundPort;
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( void ) memcpy( pxNewBuffer->pucEthernetBuffer, pxNetworkBuffer->pucEthernetBuffer, uxLengthToCopy );
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}
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return pxNewBuffer;
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}
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/*-----------------------------------------------------------*/
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/**
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* @brief Get the network buffer descriptor from the packet buffer.
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*
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* @param[in] pvBuffer: The pointer to packet buffer.
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* @param[in] uxOffset: Additional offset (such as the packet length of UDP packet etc.).
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*
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* @return The network buffer descriptor if the alignment is correct. Else a NULL is returned.
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*/
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static NetworkBufferDescriptor_t * prvPacketBuffer_to_NetworkBuffer( const void * pvBuffer,
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size_t uxOffset )
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{
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uintptr_t uxBuffer;
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NetworkBufferDescriptor_t * pxResult;
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if( pvBuffer == NULL )
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{
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pxResult = NULL;
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}
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else
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{
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/* Obtain the network buffer from the zero copy pointer. */
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uxBuffer = ipPOINTER_CAST( uintptr_t, pvBuffer );
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/* The input here is a pointer to a packet buffer plus some offset. Subtract
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* this offset, and also the size of the header in the network buffer, usually
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* 8 + 2 bytes. */
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uxBuffer -= ( uxOffset + ipBUFFER_PADDING );
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/* Here a pointer was placed to the network descriptor. As a
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* pointer is dereferenced, make sure it is well aligned. */
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if( ( uxBuffer & ( ( ( uintptr_t ) sizeof( uxBuffer ) ) - 1U ) ) == ( uintptr_t ) 0U )
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{
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/* The following statement may trigger a:
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* warning: cast increases required alignment of target type [-Wcast-align].
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* It has been confirmed though that the alignment is suitable. */
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pxResult = *( ( NetworkBufferDescriptor_t ** ) uxBuffer );
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}
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else
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{
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pxResult = NULL;
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}
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}
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return pxResult;
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}
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/*-----------------------------------------------------------*/
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#if ( ipconfigZERO_COPY_TX_DRIVER != 0 ) || ( ipconfigZERO_COPY_RX_DRIVER != 0 )
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/**
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* @brief Get the network buffer from the packet buffer.
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*
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* @param[in] pvBuffer: Pointer to the packet buffer.
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*
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* @return The network buffer if the alignment is correct. Else a NULL is returned.
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*/
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NetworkBufferDescriptor_t * pxPacketBuffer_to_NetworkBuffer( const void * pvBuffer )
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{
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return prvPacketBuffer_to_NetworkBuffer( pvBuffer, 0U );
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}
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#endif /* ( ipconfigZERO_COPY_TX_DRIVER != 0 ) || ( ipconfigZERO_COPY_RX_DRIVER != 0 ) */
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/*-----------------------------------------------------------*/
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/**
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* @brief Get the network buffer from the UDP Payload buffer.
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*
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* @param[in] pvBuffer: Pointer to the UDP payload buffer.
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*
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* @return The network buffer if the alignment is correct. Else a NULL is returned.
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*/
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NetworkBufferDescriptor_t * pxUDPPayloadBuffer_to_NetworkBuffer( const void * pvBuffer )
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{
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return prvPacketBuffer_to_NetworkBuffer( pvBuffer, sizeof( UDPPacket_t ) );
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}
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/*-----------------------------------------------------------*/
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/**
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* @brief Function to check whether the current context belongs to
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* the IP-task.
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*
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* @return If the current context belongs to the IP-task, then pdTRUE is
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* returned. Else pdFALSE is returned.
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*
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* @note Very important: the IP-task is not allowed to call its own API's,
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* because it would easily get into a dead-lock.
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*/
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BaseType_t xIsCallingFromIPTask( void )
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{
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BaseType_t xReturn;
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if( xTaskGetCurrentTaskHandle() == FreeRTOS_GetIPTaskHandle() )
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{
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xReturn = pdTRUE;
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}
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else
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{
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xReturn = pdFALSE;
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}
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return xReturn;
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}
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/*-----------------------------------------------------------*/
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/**
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* @brief Process a 'Network down' event and complete required processing.
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*/
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void prvProcessNetworkDownEvent( void )
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{
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/* Stop the ARP timer while there is no network. */
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vIPSetARPTimerEnableState( pdFALSE );
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#if ( ipconfigUSE_NETWORK_EVENT_HOOK == 1 )
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{
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/* The first network down event is generated by the IP stack itself to
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* initialise the network hardware, so do not call the network down event
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* the first time through. */
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if( xCallEventHook == pdTRUE )
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{
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vApplicationIPNetworkEventHook( eNetworkDown );
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}
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xCallEventHook = pdTRUE;
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}
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#endif /* if ipconfigUSE_NETWORK_EVENT_HOOK == 1 */
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/* Per the ARP Cache Validation section of https://tools.ietf.org/html/rfc1122,
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* treat network down as a "delivery problem" and flush the ARP cache for this
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* interface. */
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FreeRTOS_ClearARP();
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/* The network has been disconnected (or is being initialised for the first
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* time). Perform whatever hardware processing is necessary to bring it up
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* again, or wait for it to be available again. This is hardware dependent. */
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if( xNetworkInterfaceInitialise() != pdPASS )
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{
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/* Ideally the network interface initialisation function will only
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* return when the network is available. In case this is not the case,
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* wait a while before retrying the initialisation. */
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vTaskDelay( ipINITIALISATION_RETRY_DELAY );
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FreeRTOS_NetworkDown();
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}
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else
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{
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/* Set remaining time to 0 so it will become active immediately. */
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#if ipconfigUSE_DHCP == 1
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{
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/* The network is not up until DHCP has completed. */
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vDHCPProcess( pdTRUE, eInitialWait );
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}
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#else
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{
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/* Perform any necessary 'network up' processing. */
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vIPNetworkUpCalls();
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}
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#endif
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}
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}
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/*-----------------------------------------------------------*/
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/**
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* @brief Check the values of configuration options and assert on it. Also verify that the IP-task
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* has not already been initialized.
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*/
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void vPreCheckConfigs( void )
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{
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/* This function should only be called once. */
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configASSERT( xIPIsNetworkTaskReady() == pdFALSE );
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configASSERT( xNetworkEventQueue == NULL );
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configASSERT( FreeRTOS_GetIPTaskHandle() == NULL );
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#if ( configASSERT_DEFINED == 1 )
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{
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volatile size_t uxSize = sizeof( uintptr_t );
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if( uxSize == 8 )
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{
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/* This is a 64-bit platform, make sure there is enough space in
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* pucEthernetBuffer to store a pointer. */
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configASSERT( ipconfigBUFFER_PADDING >= 14 );
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/* But it must have this strange alignment: */
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configASSERT( ( ( ( ipconfigBUFFER_PADDING ) + 2 ) % 4 ) == 0 );
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}
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/* LCOV_EXCL_BR_START */
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uxSize = ipconfigNETWORK_MTU;
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/* Check if MTU is big enough. */
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configASSERT( uxSize >= ( ipSIZE_OF_IPv4_HEADER + ipSIZE_OF_TCP_HEADER + ipconfigTCP_MSS ) );
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uxSize = sizeof( EthernetHeader_t );
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/* Check structure packing is correct. */
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configASSERT( uxSize == ipEXPECTED_EthernetHeader_t_SIZE );
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uxSize = sizeof( ARPHeader_t );
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configASSERT( uxSize == ipEXPECTED_ARPHeader_t_SIZE );
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uxSize = sizeof( IPHeader_t );
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configASSERT( uxSize == ipEXPECTED_IPHeader_t_SIZE );
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uxSize = sizeof( ICMPHeader_t );
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configASSERT( uxSize == ipEXPECTED_ICMPHeader_t_SIZE );
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uxSize = sizeof( UDPHeader_t );
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configASSERT( uxSize == ipEXPECTED_UDPHeader_t_SIZE );
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/* LCOV_EXCL_BR_STOP */
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}
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#endif /* if ( configASSERT_DEFINED == 1 ) */
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}
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/**
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* @brief Generate or check the protocol checksum of the data sent in the first parameter.
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* At the same time, the length of the packet and the length of the different layers
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* will be checked.
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*
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* @param[in] pucEthernetBuffer: The Ethernet buffer for which the checksum is to be calculated
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* or checked.
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* @param[in] uxBufferLength: the total number of bytes received, or the number of bytes written
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* in the packet buffer.
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* @param[in] xOutgoingPacket: Whether this is an outgoing packet or not.
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*
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* @return When xOutgoingPacket is false: the error code can be either: ipINVALID_LENGTH,
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* ipUNHANDLED_PROTOCOL, ipWRONG_CRC, or ipCORRECT_CRC.
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* When xOutgoingPacket is true: either ipINVALID_LENGTH, ipUNHANDLED_PROTOCOL,
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* or ipCORRECT_CRC.
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*/
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uint16_t usGenerateProtocolChecksum( uint8_t * pucEthernetBuffer,
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size_t uxBufferLength,
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BaseType_t xOutgoingPacket )
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{
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uint32_t ulLength;
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uint16_t usChecksum; /* The checksum as calculated. */
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uint16_t usChecksumFound = 0U; /* The checksum as found in the incoming packet. */
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const IPPacket_t * pxIPPacket;
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UBaseType_t uxIPHeaderLength;
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ProtocolPacket_t * pxProtPack;
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uint8_t ucProtocol;
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#if ( ipconfigHAS_DEBUG_PRINTF != 0 )
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const char * pcType;
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#endif
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uint16_t usLength;
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uint16_t ucVersionHeaderLength;
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DEBUG_DECLARE_TRACE_VARIABLE( BaseType_t, xLocation, 0 );
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/* Introduce a do-while loop to allow use of break statements.
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* Note: MISRA prohibits use of 'goto', thus replaced with breaks. */
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do
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{
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/* Check for minimum packet size. */
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if( uxBufferLength < sizeof( IPPacket_t ) )
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{
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usChecksum = ipINVALID_LENGTH;
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DEBUG_SET_TRACE_VARIABLE( xLocation, 1 );
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break;
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}
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/* Parse the packet length. */
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pxIPPacket = ( ( const IPPacket_t * ) pucEthernetBuffer );
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/* Per https://tools.ietf.org/html/rfc791, the four-bit Internet Header
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* Length field contains the length of the internet header in 32-bit words. */
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ucVersionHeaderLength = pxIPPacket->xIPHeader.ucVersionHeaderLength;
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ucVersionHeaderLength = ( ucVersionHeaderLength & ( uint8_t ) 0x0FU ) << 2;
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uxIPHeaderLength = ( UBaseType_t ) ucVersionHeaderLength;
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/* Check for minimum packet size. */
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if( uxBufferLength < ( sizeof( IPPacket_t ) + ( uxIPHeaderLength - ipSIZE_OF_IPv4_HEADER ) ) )
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{
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usChecksum = ipINVALID_LENGTH;
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DEBUG_SET_TRACE_VARIABLE( xLocation, 2 );
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|
break;
|
|
}
|
|
|
|
usLength = pxIPPacket->xIPHeader.usLength;
|
|
usLength = FreeRTOS_ntohs( usLength );
|
|
|
|
if( usLength < uxIPHeaderLength )
|
|
{
|
|
usChecksum = ipINVALID_LENGTH;
|
|
DEBUG_SET_TRACE_VARIABLE( xLocation, 3 );
|
|
break;
|
|
}
|
|
|
|
if( uxBufferLength < ( size_t ) ( ipSIZE_OF_ETH_HEADER + ( size_t ) usLength ) )
|
|
{
|
|
usChecksum = ipINVALID_LENGTH;
|
|
DEBUG_SET_TRACE_VARIABLE( xLocation, 4 );
|
|
break;
|
|
}
|
|
|
|
/* Identify the next protocol. */
|
|
ucProtocol = pxIPPacket->xIPHeader.ucProtocol;
|
|
|
|
/* N.B., if this IP packet header includes Options, then the following
|
|
* assignment results in a pointer into the protocol packet with the Ethernet
|
|
* and IP headers incorrectly aligned. However, either way, the "third"
|
|
* protocol (Layer 3 or 4) header will be aligned, which is the convenience
|
|
* of this calculation. */
|
|
pxProtPack = ( ( ProtocolPacket_t * ) &( pucEthernetBuffer[ uxIPHeaderLength - ipSIZE_OF_IPv4_HEADER ] ) );
|
|
|
|
/* Switch on the Layer 3/4 protocol. */
|
|
if( ucProtocol == ( uint8_t ) ipPROTOCOL_UDP )
|
|
{
|
|
if( uxBufferLength < ( uxIPHeaderLength + ipSIZE_OF_ETH_HEADER + ipSIZE_OF_UDP_HEADER ) )
|
|
{
|
|
usChecksum = ipINVALID_LENGTH;
|
|
DEBUG_SET_TRACE_VARIABLE( xLocation, 5 );
|
|
break;
|
|
}
|
|
|
|
if( xOutgoingPacket != pdFALSE )
|
|
{
|
|
/* Clear the UDP checksum field before calculating it. */
|
|
pxProtPack->xUDPPacket.xUDPHeader.usChecksum = 0U;
|
|
}
|
|
else
|
|
{
|
|
usChecksumFound = pxProtPack->xUDPPacket.xUDPHeader.usChecksum;
|
|
}
|
|
|
|
#if ( ipconfigHAS_DEBUG_PRINTF != 0 )
|
|
{
|
|
pcType = "UDP";
|
|
}
|
|
#endif /* ipconfigHAS_DEBUG_PRINTF != 0 */
|
|
}
|
|
else if( ucProtocol == ( uint8_t ) ipPROTOCOL_TCP )
|
|
{
|
|
if( uxBufferLength < ( uxIPHeaderLength + ipSIZE_OF_ETH_HEADER + ipSIZE_OF_TCP_HEADER ) )
|
|
{
|
|
usChecksum = ipINVALID_LENGTH;
|
|
DEBUG_SET_TRACE_VARIABLE( xLocation, 6 );
|
|
break;
|
|
}
|
|
|
|
if( xOutgoingPacket != pdFALSE )
|
|
{
|
|
/* Clear the TCP checksum field before calculating it. */
|
|
pxProtPack->xTCPPacket.xTCPHeader.usChecksum = 0U;
|
|
}
|
|
else
|
|
{
|
|
usChecksumFound = pxProtPack->xTCPPacket.xTCPHeader.usChecksum;
|
|
}
|
|
|
|
#if ( ipconfigHAS_DEBUG_PRINTF != 0 )
|
|
{
|
|
pcType = "TCP";
|
|
}
|
|
#endif /* ipconfigHAS_DEBUG_PRINTF != 0 */
|
|
}
|
|
else if( ( ucProtocol == ( uint8_t ) ipPROTOCOL_ICMP ) ||
|
|
( ucProtocol == ( uint8_t ) ipPROTOCOL_IGMP ) )
|
|
{
|
|
if( uxBufferLength < ( uxIPHeaderLength + ipSIZE_OF_ETH_HEADER + ipSIZE_OF_ICMP_HEADER ) )
|
|
{
|
|
usChecksum = ipINVALID_LENGTH;
|
|
DEBUG_SET_TRACE_VARIABLE( xLocation, 7 );
|
|
break;
|
|
}
|
|
|
|
if( xOutgoingPacket != pdFALSE )
|
|
{
|
|
/* Clear the ICMP/IGMP checksum field before calculating it. */
|
|
pxProtPack->xICMPPacket.xICMPHeader.usChecksum = 0U;
|
|
}
|
|
else
|
|
{
|
|
usChecksumFound = pxProtPack->xICMPPacket.xICMPHeader.usChecksum;
|
|
}
|
|
|
|
#if ( ipconfigHAS_DEBUG_PRINTF != 0 )
|
|
{
|
|
if( ucProtocol == ( uint8_t ) ipPROTOCOL_ICMP )
|
|
{
|
|
pcType = "ICMP";
|
|
}
|
|
else
|
|
{
|
|
pcType = "IGMP";
|
|
}
|
|
}
|
|
#endif /* ipconfigHAS_DEBUG_PRINTF != 0 */
|
|
}
|
|
else
|
|
{
|
|
/* Unhandled protocol, other than ICMP, IGMP, UDP, or TCP. */
|
|
usChecksum = ipUNHANDLED_PROTOCOL;
|
|
DEBUG_SET_TRACE_VARIABLE( xLocation, 8 );
|
|
break;
|
|
}
|
|
|
|
/* The protocol and checksum field have been identified. Check the direction
|
|
* of the packet. */
|
|
if( xOutgoingPacket != pdFALSE )
|
|
{
|
|
/* This is an outgoing packet. The CRC-field has been cleared. */
|
|
}
|
|
else if( ( usChecksumFound == 0U ) && ( ucProtocol == ( uint8_t ) ipPROTOCOL_UDP ) )
|
|
{
|
|
#if ( ipconfigUDP_PASS_ZERO_CHECKSUM_PACKETS == 0 )
|
|
{
|
|
/* Sender hasn't set the checksum, drop the packet because
|
|
* ipconfigUDP_PASS_ZERO_CHECKSUM_PACKETS is not set. */
|
|
usChecksum = ipWRONG_CRC;
|
|
#if ( ipconfigHAS_PRINTF != 0 )
|
|
{
|
|
static BaseType_t xCount = 0;
|
|
|
|
/* Exclude this from branch coverage as this is only used for debugging. */
|
|
if( xCount < 5 ) /* LCOV_EXCL_BR_LINE */
|
|
{
|
|
FreeRTOS_printf( ( "usGenerateProtocolChecksum: UDP packet from %xip without CRC dropped\n",
|
|
FreeRTOS_ntohl( pxIPPacket->xIPHeader.ulSourceIPAddress ) ) );
|
|
xCount++;
|
|
}
|
|
}
|
|
#endif /* ( ipconfigHAS_PRINTF != 0 ) */
|
|
}
|
|
#else /* if ( ipconfigUDP_PASS_ZERO_CHECKSUM_PACKETS == 0 ) */
|
|
{
|
|
/* Sender hasn't set the checksum, no use to calculate it. */
|
|
usChecksum = ipCORRECT_CRC;
|
|
}
|
|
#endif /* if ( ipconfigUDP_PASS_ZERO_CHECKSUM_PACKETS == 0 ) */
|
|
DEBUG_SET_TRACE_VARIABLE( xLocation, 9 );
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
/* Other incoming packet than UDP. */
|
|
}
|
|
|
|
usLength = pxIPPacket->xIPHeader.usLength;
|
|
usLength = FreeRTOS_ntohs( usLength );
|
|
ulLength = ( uint32_t ) usLength;
|
|
ulLength -= ( ( uint16_t ) uxIPHeaderLength ); /* normally minus 20 */
|
|
|
|
if( ( ulLength < ( ( uint32_t ) sizeof( pxProtPack->xUDPPacket.xUDPHeader ) ) ) ||
|
|
( ulLength > ( ( uint32_t ) ipconfigNETWORK_MTU - ( uint32_t ) uxIPHeaderLength ) ) )
|
|
{
|
|
#if ( ipconfigHAS_DEBUG_PRINTF != 0 )
|
|
{
|
|
FreeRTOS_debug_printf( ( "usGenerateProtocolChecksum[%s]: len invalid: %lu\n", pcType, ulLength ) );
|
|
}
|
|
#endif /* ipconfigHAS_DEBUG_PRINTF != 0 */
|
|
|
|
/* Again, in a 16-bit return value there is no space to indicate an
|
|
* error. For incoming packets, 0x1234 will cause dropping of the packet.
|
|
* For outgoing packets, there is a serious problem with the
|
|
* format/length */
|
|
usChecksum = ipINVALID_LENGTH;
|
|
DEBUG_SET_TRACE_VARIABLE( xLocation, 10 );
|
|
break;
|
|
}
|
|
|
|
if( ucProtocol <= ( uint8_t ) ipPROTOCOL_IGMP )
|
|
{
|
|
/* ICMP/IGMP do not have a pseudo header for CRC-calculation. */
|
|
usChecksum = ( uint16_t )
|
|
( ~usGenerateChecksum( 0U,
|
|
( const uint8_t * ) &( pxProtPack->xICMPPacket.xICMPHeader ), ( size_t ) ulLength ) );
|
|
}
|
|
else
|
|
{
|
|
/* For UDP and TCP, sum the pseudo header, i.e. IP protocol + length
|
|
* fields */
|
|
usChecksum = ( uint16_t ) ( ulLength + ( ( uint16_t ) ucProtocol ) );
|
|
|
|
/* And then continue at the IPv4 source and destination addresses. */
|
|
usChecksum = ( uint16_t )
|
|
( ~usGenerateChecksum( usChecksum,
|
|
ipPOINTER_CAST( const uint8_t *, &( pxIPPacket->xIPHeader.ulSourceIPAddress ) ),
|
|
( size_t ) ( ( 2U * ipSIZE_OF_IPv4_ADDRESS ) + ulLength ) ) );
|
|
/* Sum TCP header and data. */
|
|
}
|
|
|
|
if( xOutgoingPacket == pdFALSE )
|
|
{
|
|
/* This is in incoming packet. If the CRC is correct, it should be zero. */
|
|
if( usChecksum == 0U )
|
|
{
|
|
usChecksum = ( uint16_t ) ipCORRECT_CRC;
|
|
}
|
|
else
|
|
{
|
|
usChecksum = ( uint16_t ) ipWRONG_CRC;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if( ( usChecksum == 0U ) && ( ucProtocol == ( uint8_t ) ipPROTOCOL_UDP ) )
|
|
{
|
|
/* In case of UDP, a calculated checksum of 0x0000 is transmitted
|
|
* as 0xffff. A value of zero would mean that the checksum is not used. */
|
|
usChecksum = ( uint16_t ) 0xffffu;
|
|
}
|
|
}
|
|
|
|
usChecksum = FreeRTOS_htons( usChecksum );
|
|
|
|
if( xOutgoingPacket != pdFALSE )
|
|
{
|
|
switch( ucProtocol )
|
|
{
|
|
case ipPROTOCOL_UDP:
|
|
pxProtPack->xUDPPacket.xUDPHeader.usChecksum = usChecksum;
|
|
break;
|
|
|
|
case ipPROTOCOL_TCP:
|
|
pxProtPack->xTCPPacket.xTCPHeader.usChecksum = usChecksum;
|
|
break;
|
|
|
|
case ipPROTOCOL_ICMP:
|
|
pxProtPack->xICMPPacket.xICMPHeader.usChecksum = usChecksum;
|
|
break;
|
|
|
|
default: /* ipPROTOCOL_IGMP */
|
|
pxProtPack->xICMPPacket.xICMPHeader.usChecksum = usChecksum;
|
|
break;
|
|
}
|
|
|
|
usChecksum = ( uint16_t ) ipCORRECT_CRC;
|
|
}
|
|
|
|
#if ( ipconfigHAS_DEBUG_PRINTF != 0 )
|
|
else if( ( xOutgoingPacket == pdFALSE ) && ( usChecksum != ipCORRECT_CRC ) )
|
|
{
|
|
FreeRTOS_debug_printf( ( "usGenerateProtocolChecksum[%s]: ID %04X: from %lxip to %lxip bad crc: %04X\n",
|
|
pcType,
|
|
FreeRTOS_ntohs( pxIPPacket->xIPHeader.usIdentification ),
|
|
FreeRTOS_ntohl( pxIPPacket->xIPHeader.ulSourceIPAddress ),
|
|
FreeRTOS_ntohl( pxIPPacket->xIPHeader.ulDestinationIPAddress ),
|
|
FreeRTOS_ntohs( usChecksumFound ) ) );
|
|
}
|
|
else
|
|
{
|
|
/* Nothing. */
|
|
}
|
|
#endif /* ipconfigHAS_DEBUG_PRINTF != 0 */
|
|
} while( ipFALSE_BOOL );
|
|
|
|
if( ( usChecksum == ipUNHANDLED_PROTOCOL ) ||
|
|
( usChecksum == ipINVALID_LENGTH ) )
|
|
{
|
|
/* NOP if ipconfigHAS_PRINTF != 0 */
|
|
FreeRTOS_printf( ( "CRC error: %04x location %ld\n", usChecksum, xLocation ) );
|
|
}
|
|
|
|
return usChecksum;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/**
|
|
* This method generates a checksum for a given IPv4 header, per RFC791 (page 14).
|
|
* The checksum algorithm is described as:
|
|
* "[T]he 16 bit one's complement of the one's complement sum of all 16 bit words in the
|
|
* header. For purposes of computing the checksum, the value of the checksum field is zero."
|
|
*
|
|
* In a nutshell, that means that each 16-bit 'word' must be summed, after which
|
|
* the number of 'carries' (overflows) is added to the result. If that addition
|
|
* produces an overflow, that 'carry' must also be added to the final result. The final checksum
|
|
* should be the bitwise 'not' (ones-complement) of the result if the packet is
|
|
* meant to be transmitted, but this method simply returns the raw value, probably
|
|
* because when a packet is received, the checksum is verified by checking that
|
|
* ((received & calculated) == 0) without applying a bitwise 'not' to the 'calculated' checksum.
|
|
*
|
|
* This logic is optimized for microcontrollers which have limited resources, so the logic looks odd.
|
|
* It iterates over the full range of 16-bit words, but it does so by processing several 32-bit
|
|
* words at once whenever possible. Its first step is to align the memory pointer to a 32-bit boundary,
|
|
* after which it runs a fast loop to process multiple 32-bit words at once and adding their 'carries'.
|
|
* Finally, it finishes up by processing any remaining 16-bit words, and adding up all of the 'carries'.
|
|
* With 32-bit arithmetic, the number of 16-bit 'carries' produced by sequential additions can be found
|
|
* by looking at the 16 most-significant bits of the 32-bit integer, since a 32-bit int will continue
|
|
* counting up instead of overflowing after 16 bits. That is why the actual checksum calculations look like:
|
|
* union.u32 = ( uint32_t ) union.u16[ 0 ] + union.u16[ 1 ];
|
|
*
|
|
* Arguments:
|
|
* ulSum: This argument provides a value to initialise the progressive summation
|
|
* of the header's values to. It is often 0, but protocols like TCP or UDP
|
|
* can have pseudo-header fields which need to be included in the checksum.
|
|
* pucNextData: This argument contains the address of the first byte which this
|
|
* method should process. The method's memory iterator is initialised to this value.
|
|
* uxDataLengthBytes: This argument contains the number of bytes that this method
|
|
* should process.
|
|
*/
|
|
|
|
/**
|
|
* @brief Calculates the 16-bit checksum of an array of bytes
|
|
*
|
|
* @param[in] usSum: The initial sum, obtained from earlier data.
|
|
* @param[in] pucNextData: The actual data.
|
|
* @param[in] uxByteCount: The number of bytes.
|
|
*
|
|
* @return The 16-bit one's complement of the one's complement sum of all 16-bit
|
|
* words in the header
|
|
*/
|
|
uint16_t usGenerateChecksum( uint16_t usSum,
|
|
const uint8_t * pucNextData,
|
|
size_t uxByteCount )
|
|
{
|
|
/* MISRA/PC-lint doesn't like the use of unions. Here, they are a great
|
|
* aid though to optimise the calculations. */
|
|
xUnion32 xSum2, xSum, xTerm;
|
|
xUnionPtr xSource;
|
|
xUnionPtr xLastSource;
|
|
uintptr_t uxAlignBits;
|
|
uint32_t ulCarry = 0UL;
|
|
uint16_t usTemp;
|
|
size_t uxDataLengthBytes = uxByteCount;
|
|
|
|
/* Small MCUs often spend up to 30% of the time doing checksum calculations
|
|
* This function is optimised for 32-bit CPUs; Each time it will try to fetch
|
|
* 32-bits, sums it with an accumulator and counts the number of carries. */
|
|
|
|
/* Swap the input (little endian platform only). */
|
|
usTemp = FreeRTOS_ntohs( usSum );
|
|
xSum.u32 = ( uint32_t ) usTemp;
|
|
xTerm.u32 = 0UL;
|
|
|
|
xSource.u8ptr = ipPOINTER_CAST( uint8_t *, pucNextData );
|
|
uxAlignBits = ( ( ( uintptr_t ) pucNextData ) & 0x03U );
|
|
|
|
/*
|
|
* If pucNextData is non-aligned then the checksum is starting at an
|
|
* odd position and we need to make sure the usSum value now in xSum is
|
|
* as if it had been "aligned" in the same way.
|
|
*/
|
|
if( ( uxAlignBits & 1UL ) != 0U )
|
|
{
|
|
xSum.u32 = ( ( xSum.u32 & 0xffU ) << 8 ) | ( ( xSum.u32 & 0xff00U ) >> 8 );
|
|
}
|
|
|
|
/* If byte (8-bit) aligned... */
|
|
if( ( ( uxAlignBits & 1UL ) != 0UL ) && ( uxDataLengthBytes >= ( size_t ) 1 ) )
|
|
{
|
|
xTerm.u8[ 1 ] = *( xSource.u8ptr );
|
|
xSource.u8ptr++;
|
|
uxDataLengthBytes--;
|
|
/* Now xSource is word (16-bit) aligned. */
|
|
}
|
|
|
|
/* If half-word (16-bit) aligned... */
|
|
if( ( ( uxAlignBits == 1U ) || ( uxAlignBits == 2U ) ) && ( uxDataLengthBytes >= 2U ) )
|
|
{
|
|
xSum.u32 += *( xSource.u16ptr );
|
|
xSource.u16ptr++;
|
|
uxDataLengthBytes -= 2U;
|
|
/* Now xSource is word (32-bit) aligned. */
|
|
}
|
|
|
|
/* Word (32-bit) aligned, do the most part. */
|
|
xLastSource.u32ptr = ( xSource.u32ptr + ( uxDataLengthBytes / 4U ) ) - 3U;
|
|
|
|
/* In this loop, four 32-bit additions will be done, in total 16 bytes.
|
|
* Indexing with constants (0,1,2,3) gives faster code than using
|
|
* post-increments. */
|
|
while( xSource.u32ptr < xLastSource.u32ptr )
|
|
{
|
|
/* Use a secondary Sum2, just to see if the addition produced an
|
|
* overflow. */
|
|
xSum2.u32 = xSum.u32 + xSource.u32ptr[ 0 ];
|
|
|
|
if( xSum2.u32 < xSum.u32 )
|
|
{
|
|
ulCarry++;
|
|
}
|
|
|
|
/* Now add the secondary sum to the major sum, and remember if there was
|
|
* a carry. */
|
|
xSum.u32 = xSum2.u32 + xSource.u32ptr[ 1 ];
|
|
|
|
if( xSum2.u32 > xSum.u32 )
|
|
{
|
|
ulCarry++;
|
|
}
|
|
|
|
/* And do the same trick once again for indexes 2 and 3 */
|
|
xSum2.u32 = xSum.u32 + xSource.u32ptr[ 2 ];
|
|
|
|
if( xSum2.u32 < xSum.u32 )
|
|
{
|
|
ulCarry++;
|
|
}
|
|
|
|
xSum.u32 = xSum2.u32 + xSource.u32ptr[ 3 ];
|
|
|
|
if( xSum2.u32 > xSum.u32 )
|
|
{
|
|
ulCarry++;
|
|
}
|
|
|
|
/* And finally advance the pointer 4 * 4 = 16 bytes. */
|
|
xSource.u32ptr = &( xSource.u32ptr[ 4 ] );
|
|
}
|
|
|
|
/* Now add all carries. */
|
|
xSum.u32 = ( uint32_t ) xSum.u16[ 0 ] + xSum.u16[ 1 ] + ulCarry;
|
|
|
|
uxDataLengthBytes %= 16U;
|
|
xLastSource.u8ptr = ( uint8_t * ) ( xSource.u8ptr + ( uxDataLengthBytes & ~( ( size_t ) 1 ) ) );
|
|
|
|
/* Half-word aligned. */
|
|
|
|
/* Coverity does not like Unions. Warning issued here: "The operator "<"
|
|
* is being applied to the pointers "xSource.u16ptr" and "xLastSource.u16ptr",
|
|
* which do not point into the same object." */
|
|
while( xSource.u16ptr < xLastSource.u16ptr )
|
|
{
|
|
/* At least one more short. */
|
|
xSum.u32 += xSource.u16ptr[ 0 ];
|
|
xSource.u16ptr++;
|
|
}
|
|
|
|
if( ( uxDataLengthBytes & ( size_t ) 1 ) != 0U ) /* Maybe one more ? */
|
|
{
|
|
xTerm.u8[ 0 ] = xSource.u8ptr[ 0 ];
|
|
}
|
|
|
|
xSum.u32 += xTerm.u32;
|
|
|
|
/* Now add all carries again. */
|
|
|
|
/* Assigning value from "xTerm.u32" to "xSum.u32" here, but that stored value is overwritten before it can be used.
|
|
* Coverity doesn't understand about union variables. */
|
|
xSum.u32 = ( uint32_t ) xSum.u16[ 0 ] + xSum.u16[ 1 ];
|
|
|
|
/* coverity[value_overwrite] */
|
|
xSum.u32 = ( uint32_t ) xSum.u16[ 0 ] + xSum.u16[ 1 ];
|
|
|
|
if( ( uxAlignBits & 1U ) != 0U )
|
|
{
|
|
/* Quite unlikely, but pucNextData might be non-aligned, which would
|
|
* mean that a checksum is calculated starting at an odd position. */
|
|
xSum.u32 = ( ( xSum.u32 & 0xffU ) << 8 ) | ( ( xSum.u32 & 0xff00U ) >> 8 );
|
|
}
|
|
|
|
/* swap the output (little endian platform only). */
|
|
return FreeRTOS_htons( ( ( uint16_t ) xSum.u32 ) );
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#if ( ipconfigHAS_PRINTF != 0 )
|
|
|
|
#ifndef ipMONITOR_MAX_HEAP
|
|
|
|
/* As long as the heap has more space than e.g. 1 MB, there
|
|
* will be no messages. */
|
|
#define ipMONITOR_MAX_HEAP ( 1024U * 1024U )
|
|
#endif /* ipMONITOR_MAX_HEAP */
|
|
|
|
#ifndef ipMONITOR_PERCENTAGE_90
|
|
/* Make this number lower to get less logging messages. */
|
|
#define ipMONITOR_PERCENTAGE_90 ( 90U )
|
|
#endif
|
|
|
|
#define ipMONITOR_PERCENTAGE_100 ( 100U )
|
|
|
|
/**
|
|
* @brief A function that monitors a three resources: the heap, the space in the message
|
|
* queue of the IP-task, the number of available network buffer descriptors.
|
|
*/
|
|
void vPrintResourceStats( void )
|
|
{
|
|
UBaseType_t uxCurrentBufferCount;
|
|
size_t uxMinSize;
|
|
|
|
/* When setting up and testing a project with FreeRTOS+TCP, it is
|
|
* can be helpful to monitor a few resources: the number of network
|
|
* buffers and the amount of available heap.
|
|
* This function will issue some logging when a minimum value has
|
|
* changed. */
|
|
uxCurrentBufferCount = uxGetMinimumFreeNetworkBuffers();
|
|
|
|
if( uxLastMinBufferCount > uxCurrentBufferCount )
|
|
{
|
|
/* The logging produced below may be helpful
|
|
* while tuning +TCP: see how many buffers are in use. */
|
|
uxLastMinBufferCount = uxCurrentBufferCount;
|
|
FreeRTOS_printf( ( "Network buffers: %lu lowest %lu\n",
|
|
uxGetNumberOfFreeNetworkBuffers(),
|
|
uxCurrentBufferCount ) );
|
|
}
|
|
|
|
uxMinSize = xPortGetMinimumEverFreeHeapSize();
|
|
|
|
if( uxMinLastSize == 0U )
|
|
{
|
|
/* Probably the first time this function is called. */
|
|
uxMinLastSize = uxMinSize;
|
|
}
|
|
else if( uxMinSize >= ipMONITOR_MAX_HEAP )
|
|
{
|
|
/* There is more than enough heap space. No need for logging. */
|
|
}
|
|
/* Write logging if there is a 10% decrease since the last time logging was written. */
|
|
else if( ( uxMinLastSize * ipMONITOR_PERCENTAGE_90 ) > ( uxMinSize * ipMONITOR_PERCENTAGE_100 ) )
|
|
{
|
|
uxMinLastSize = uxMinSize;
|
|
FreeRTOS_printf( ( "Heap: current %lu lowest %lu\n", xPortGetFreeHeapSize(), uxMinSize ) );
|
|
}
|
|
else
|
|
{
|
|
/* Nothing to log. */
|
|
}
|
|
|
|
#if ( ipconfigCHECK_IP_QUEUE_SPACE != 0 )
|
|
{
|
|
UBaseType_t uxCurrentCount = 0u;
|
|
|
|
uxCurrentCount = uxGetMinimumIPQueueSpace();
|
|
|
|
if( uxLastMinQueueSpace != uxCurrentCount )
|
|
{
|
|
/* The logging produced below may be helpful
|
|
* while tuning +TCP: see how many buffers are in use. */
|
|
uxLastMinQueueSpace = uxCurrentCount;
|
|
FreeRTOS_printf( ( "Queue space: lowest %lu\n", uxCurrentCount ) );
|
|
}
|
|
}
|
|
#endif /* ipconfigCHECK_IP_QUEUE_SPACE */
|
|
}
|
|
#endif /* ( ipconfigHAS_PRINTF != 0 ) */
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/**
|
|
* @brief Utility function: Convert error number to a human readable
|
|
* string. Declaration in FreeRTOS_errno_TCP.h.
|
|
*
|
|
* @param[in] xErrnum: The error number.
|
|
* @param[in] pcBuffer: Buffer big enough to be filled with the human readable message.
|
|
* @param[in] uxLength: Maximum length of the buffer.
|
|
*
|
|
* @return The buffer filled with human readable error string.
|
|
*/
|
|
const char * FreeRTOS_strerror_r( BaseType_t xErrnum,
|
|
char * pcBuffer,
|
|
size_t uxLength )
|
|
{
|
|
const char * pcName;
|
|
|
|
switch( xErrnum )
|
|
{
|
|
case pdFREERTOS_ERRNO_EADDRINUSE:
|
|
pcName = "EADDRINUSE";
|
|
break;
|
|
|
|
case pdFREERTOS_ERRNO_ENOMEM:
|
|
pcName = "ENOMEM";
|
|
break;
|
|
|
|
case pdFREERTOS_ERRNO_EADDRNOTAVAIL:
|
|
pcName = "EADDRNOTAVAIL";
|
|
break;
|
|
|
|
case pdFREERTOS_ERRNO_ENOPROTOOPT:
|
|
pcName = "ENOPROTOOPT";
|
|
break;
|
|
|
|
case pdFREERTOS_ERRNO_EBADF:
|
|
pcName = "EBADF";
|
|
break;
|
|
|
|
case pdFREERTOS_ERRNO_ENOSPC:
|
|
pcName = "ENOSPC";
|
|
break;
|
|
|
|
case pdFREERTOS_ERRNO_ECANCELED:
|
|
pcName = "ECANCELED";
|
|
break;
|
|
|
|
case pdFREERTOS_ERRNO_ENOTCONN:
|
|
pcName = "ENOTCONN";
|
|
break;
|
|
|
|
case pdFREERTOS_ERRNO_EINPROGRESS:
|
|
pcName = "EINPROGRESS";
|
|
break;
|
|
|
|
case pdFREERTOS_ERRNO_EOPNOTSUPP:
|
|
pcName = "EOPNOTSUPP";
|
|
break;
|
|
|
|
case pdFREERTOS_ERRNO_EINTR:
|
|
pcName = "EINTR";
|
|
break;
|
|
|
|
case pdFREERTOS_ERRNO_ETIMEDOUT:
|
|
pcName = "ETIMEDOUT";
|
|
break;
|
|
|
|
case pdFREERTOS_ERRNO_EINVAL:
|
|
pcName = "EINVAL";
|
|
break;
|
|
|
|
case pdFREERTOS_ERRNO_EWOULDBLOCK:
|
|
pcName = "EWOULDBLOCK";
|
|
break; /* same as EAGAIN */
|
|
|
|
case pdFREERTOS_ERRNO_EISCONN:
|
|
pcName = "EISCONN";
|
|
break;
|
|
|
|
default:
|
|
/* Using function "snprintf". */
|
|
( void ) snprintf( pcBuffer, uxLength, "Errno %d", ( int ) xErrnum );
|
|
pcName = NULL;
|
|
break;
|
|
}
|
|
|
|
if( pcName != NULL )
|
|
{
|
|
/* Using function "snprintf". */
|
|
( void ) snprintf( pcBuffer, uxLength, "%s", pcName );
|
|
}
|
|
|
|
if( uxLength > 0U )
|
|
{
|
|
pcBuffer[ uxLength - 1U ] = '\0';
|
|
}
|
|
|
|
return pcBuffer;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/**
|
|
* @brief Get the highest value of two int32's.
|
|
* @param[in] a: the first value.
|
|
* @param[in] b: the second value.
|
|
* @return The highest of the two values.
|
|
*/
|
|
int32_t FreeRTOS_max_int32( int32_t a,
|
|
int32_t b )
|
|
{
|
|
return ( a >= b ) ? a : b;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/**
|
|
* @brief Get the highest value of two uint32_t's.
|
|
* @param[in] a: the first value.
|
|
* @param[in] b: the second value.
|
|
* @return The highest of the two values.
|
|
*/
|
|
uint32_t FreeRTOS_max_uint32( uint32_t a,
|
|
uint32_t b )
|
|
{
|
|
return ( a >= b ) ? a : b;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/**
|
|
* @brief Get the highest value of two size_t's.
|
|
* @param[in] a: the first value.
|
|
* @param[in] b: the second value.
|
|
* @return The highest of the two values.
|
|
*/
|
|
size_t FreeRTOS_max_size_t( size_t a,
|
|
size_t b )
|
|
{
|
|
return ( a >= b ) ? a : b;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/**
|
|
* @brief Get the lowest value of two int32_t's.
|
|
* @param[in] a: the first value.
|
|
* @param[in] b: the second value.
|
|
* @return The lowest of the two values.
|
|
*/
|
|
int32_t FreeRTOS_min_int32( int32_t a,
|
|
int32_t b )
|
|
{
|
|
return ( a <= b ) ? a : b;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/**
|
|
* @brief Get the lowest value of two uint32_t's.
|
|
* @param[in] a: the first value.
|
|
* @param[in] b: the second value.
|
|
* @return The lowest of the two values.
|
|
*/
|
|
uint32_t FreeRTOS_min_uint32( uint32_t a,
|
|
uint32_t b )
|
|
{
|
|
return ( a <= b ) ? a : b;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/**
|
|
* @brief Get the lowest value of two size_t's.
|
|
* @param[in] a: the first value.
|
|
* @param[in] b: the second value.
|
|
* @return The lowest of the two values.
|
|
*/
|
|
size_t FreeRTOS_min_size_t( size_t a,
|
|
size_t b )
|
|
{
|
|
return ( a <= b ) ? a : b;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/**
|
|
* @brief Round-up a number to a multiple of 'd'.
|
|
* @param[in] a: the first value.
|
|
* @param[in] d: the second value.
|
|
* @return A multiple of d.
|
|
*/
|
|
uint32_t FreeRTOS_round_up( uint32_t a,
|
|
uint32_t d )
|
|
{
|
|
uint32_t ulResult = a;
|
|
|
|
configASSERT( d != 0 );
|
|
|
|
if( d != 0 )
|
|
{
|
|
ulResult = d * ( ( a + d - 1U ) / d );
|
|
}
|
|
|
|
return ulResult;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/**
|
|
* @brief Round-down a number to a multiple of 'd'.
|
|
* @param[in] a: the first value.
|
|
* @param[in] d: the second value.
|
|
* @return A multiple of d.
|
|
*/
|
|
uint32_t FreeRTOS_round_down( uint32_t a,
|
|
uint32_t d )
|
|
{
|
|
uint32_t ulResult = 0;
|
|
|
|
configASSERT( d != 0 );
|
|
|
|
if( d != 0 )
|
|
{
|
|
ulResult = d * ( a / d );
|
|
}
|
|
|
|
return ulResult;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/**
|
|
* @brief Convert character array (of size 4) to equivalent 32-bit value.
|
|
* @param[in] pucPtr: The character array.
|
|
* @return 32-bit equivalent value extracted from the character array.
|
|
*
|
|
* @note Going by MISRA rules, these utility functions should not be defined
|
|
* if they are not being used anywhere. But their use depends on the
|
|
* application and hence these functions are defined unconditionally.
|
|
*/
|
|
uint32_t ulChar2u32( const uint8_t * pucPtr )
|
|
{
|
|
return ( ( ( uint32_t ) pucPtr[ 0 ] ) << 24 ) |
|
|
( ( ( uint32_t ) pucPtr[ 1 ] ) << 16 ) |
|
|
( ( ( uint32_t ) pucPtr[ 2 ] ) << 8 ) |
|
|
( ( ( uint32_t ) pucPtr[ 3 ] ) );
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/**
|
|
* @brief Convert character array (of size 2) to equivalent 16-bit value.
|
|
* @param[in] pucPtr: The character array.
|
|
* @return 16-bit equivalent value extracted from the character array.
|
|
*
|
|
* @note Going by MISRA rules, these utility functions should not be defined
|
|
* if they are not being used anywhere. But their use depends on the
|
|
* application and hence these functions are defined unconditionally.
|
|
*/
|
|
uint16_t usChar2u16( const uint8_t * pucPtr )
|
|
{
|
|
return ( uint16_t )
|
|
( ( ( ( uint32_t ) pucPtr[ 0 ] ) << 8 ) |
|
|
( ( ( uint32_t ) pucPtr[ 1 ] ) ) );
|
|
}
|
|
/*-----------------------------------------------------------*/
|