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mongoose/test/freertos-tcp/FreeRTOS_Sockets.c

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/*
* FreeRTOS+TCP V2.3.2
* Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* 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
*/
/**
* @file FreeRTOS_Sockets.c
* @brief Implements the Sockets API based on Berkeley sockets for the FreeRTOS+TCP network stack.
* Sockets are used by the application processes to interact with the IP-task which in turn
* interacts with the hardware.
*/
/* Standard includes. */
#include <stdint.h>
#include <stdio.h>
/* FreeRTOS includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
#include "semphr.h"
/* FreeRTOS+TCP includes. */
#include "FreeRTOS_UDP_IP.h"
#include "FreeRTOS_IP.h"
#include "FreeRTOS_Sockets.h"
#include "FreeRTOS_IP_Private.h"
#include "FreeRTOS_DNS.h"
#include "NetworkBufferManagement.h"
/* The ItemValue of the sockets xBoundSocketListItem member holds the socket's
* port number. */
/** @brief Set the port number for the socket in the xBoundSocketListItem. */
#define socketSET_SOCKET_PORT( pxSocket, usPort ) listSET_LIST_ITEM_VALUE( ( &( ( pxSocket )->xBoundSocketListItem ) ), ( usPort ) )
/** @brief Get the port number for the socket in the xBoundSocketListItem. */
#define socketGET_SOCKET_PORT( pxSocket ) listGET_LIST_ITEM_VALUE( ( &( ( pxSocket )->xBoundSocketListItem ) ) )
/** @brief Test if a socket it bound which means it is either included in
* xBoundUDPSocketsList or xBoundTCPSocketsList
*/
#define socketSOCKET_IS_BOUND( pxSocket ) ( listLIST_ITEM_CONTAINER( &( pxSocket )->xBoundSocketListItem ) != NULL )
/** @brief If FreeRTOS_sendto() is called on a socket that is not bound to a port
* number then, depending on the FreeRTOSIPConfig.h settings, it might be
* that a port number is automatically generated for the socket.
* Automatically generated port numbers will be between
* socketAUTO_PORT_ALLOCATION_START_NUMBER and 0xffff.
*
* @note Per https://tools.ietf.org/html/rfc6056, "the dynamic ports consist of
* the range 49152-65535. However, ephemeral port selection algorithms should
* use the whole range 1024-65535" excluding those already in use (inbound
* or outbound).
*/
#if !defined( socketAUTO_PORT_ALLOCATION_START_NUMBER )
#define socketAUTO_PORT_ALLOCATION_START_NUMBER ( ( uint16_t ) 0x0400 )
#endif
/** @brief Maximum value of port number which can be auto assigned. */
#define socketAUTO_PORT_ALLOCATION_MAX_NUMBER ( ( uint16_t ) 0xffff )
/** @brief The number of octets that make up an IP address. */
#define socketMAX_IP_ADDRESS_OCTETS 4U
/** @brief A block time of 0 simply means "don't block". */
#define socketDONT_BLOCK ( ( TickType_t ) 0 )
/** @brief TCP timer period in milliseconds. */
#if ( ( ipconfigUSE_TCP == 1 ) && !defined( ipTCP_TIMER_PERIOD_MS ) )
#define ipTCP_TIMER_PERIOD_MS ( 1000U )
#endif
/* Some helper macro's for defining the 20/80 % limits of uxLittleSpace / uxEnoughSpace. */
#define sock20_PERCENT 20U /**< 20% of the defined limit. */
#define sock80_PERCENT 80U /**< 80% of the defined limit. */
#define sock100_PERCENT 100U /**< 100% of the defined limit. */
#if ( ipconfigUSE_CALLBACKS != 0 )
static portINLINE ipDECL_CAST_PTR_FUNC_FOR_TYPE( F_TCP_UDP_Handler_t )
{
return ( F_TCP_UDP_Handler_t * ) pvArgument;
}
static portINLINE ipDECL_CAST_CONST_PTR_FUNC_FOR_TYPE( F_TCP_UDP_Handler_t )
{
return ( const F_TCP_UDP_Handler_t * ) pvArgument;
}
#endif
/**
* @brief Utility function to cast pointer of a type to pointer of type NetworkBufferDescriptor_t.
*
* @return The casted pointer.
*/
static portINLINE ipDECL_CAST_PTR_FUNC_FOR_TYPE( NetworkBufferDescriptor_t )
{
return ( NetworkBufferDescriptor_t * ) pvArgument;
}
/**
* @brief Utility function to cast pointer of a type to pointer of type StreamBuffer_t.
*
* @return The casted pointer.
*/
static portINLINE ipDECL_CAST_PTR_FUNC_FOR_TYPE( StreamBuffer_t )
{
return ( StreamBuffer_t * ) pvArgument;
}
/*-----------------------------------------------------------*/
/*
* Allocate the next port number from the private allocation range.
* TCP and UDP each have their own series of port numbers
* ulProtocol is either ipPROTOCOL_UDP or ipPROTOCOL_TCP
*/
static uint16_t prvGetPrivatePortNumber( BaseType_t xProtocol );
/*
* Return the list item from within pxList that has an item value of
* xWantedItemValue. If there is no such list item return NULL.
*/
static const ListItem_t * pxListFindListItemWithValue( const List_t * pxList,
TickType_t xWantedItemValue );
/*
* Return pdTRUE only if pxSocket is valid and bound, as far as can be
* determined.
*/
static BaseType_t prvValidSocket( const FreeRTOS_Socket_t * pxSocket,
BaseType_t xProtocol,
BaseType_t xIsBound );
#if ( ipconfigUSE_TCP == 1 )
/*
* Internal function prvSockopt_so_buffer(): sets FREERTOS_SO_SNDBUF or
* FREERTOS_SO_RCVBUF properties of a socket.
*/
static BaseType_t prvSockopt_so_buffer( FreeRTOS_Socket_t * pxSocket,
int32_t lOptionName,
const void * pvOptionValue );
#endif /* ipconfigUSE_TCP == 1 */
/*
* Before creating a socket, check the validity of the parameters used
* and find the size of the socket space, which is different for UDP and TCP
*/
static BaseType_t prvDetermineSocketSize( BaseType_t xDomain,
BaseType_t xType,
BaseType_t xProtocol,
size_t * pxSocketSize );
#if ( ipconfigUSE_TCP == 1 )
/*
* Create a txStream or a rxStream, depending on the parameter 'xIsInputStream'
*/
static StreamBuffer_t * prvTCPCreateStream( FreeRTOS_Socket_t * pxSocket,
BaseType_t xIsInputStream );
#endif /* ipconfigUSE_TCP == 1 */
#if ( ipconfigUSE_TCP == 1 )
/*
* Called from FreeRTOS_send(): some checks which will be done before
* sending a TCP packed.
*/
static int32_t prvTCPSendCheck( FreeRTOS_Socket_t * pxSocket,
size_t uxDataLength );
#endif /* ipconfigUSE_TCP */
#if ( ipconfigUSE_TCP == 1 )
/*
* When a child socket gets closed, make sure to update the child-count of the parent
*/
static void prvTCPSetSocketCount( FreeRTOS_Socket_t const * pxSocketToDelete );
#endif /* ipconfigUSE_TCP == 1 */
#if ( ipconfigUSE_TCP == 1 )
/*
* Called from FreeRTOS_connect(): make some checks and if allowed, send a
* message to the IP-task to start connecting to a remote socket
*/
static BaseType_t prvTCPConnectStart( FreeRTOS_Socket_t * pxSocket,
struct freertos_sockaddr const * pxAddress );
#endif /* ipconfigUSE_TCP */
#if ( ipconfigUSE_TCP == 1 )
/*
* Check if it makes any sense to wait for a connect event.
* It may return: -EINPROGRESS, -EAGAIN, or 0 for OK.
*/
static BaseType_t bMayConnect( FreeRTOS_Socket_t const * pxSocket );
#endif /* ipconfigUSE_TCP */
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
/* Executed by the IP-task, it will check all sockets belonging to a set */
static void prvFindSelectedSocket( SocketSelect_t * pxSocketSet );
#endif /* ipconfigSUPPORT_SELECT_FUNCTION == 1 */
/*-----------------------------------------------------------*/
/** @brief The list that contains mappings between sockets and port numbers.
* Accesses to this list must be protected by critical sections of
* some kind.
*/
List_t xBoundUDPSocketsList;
#if ipconfigUSE_TCP == 1
/** @brief The list that contains mappings between sockets and port numbers.
* Accesses to this list must be protected by critical sections of
* some kind.
*/
List_t xBoundTCPSocketsList;
#endif /* ipconfigUSE_TCP == 1 */
/*-----------------------------------------------------------*/
/**
* @brief Check whether the socket is valid or not.
*
* @param[in] pxSocket: The socket being checked.
* @param[in] xProtocol: The protocol for which the socket was created.
* @param[in] xIsBound: pdTRUE when the socket should be bound, otherwise pdFALSE.
*
* @return If the socket is valid, then pdPASS is returned or else, pdFAIL
* is returned.
*/
static BaseType_t prvValidSocket( const FreeRTOS_Socket_t * pxSocket,
BaseType_t xProtocol,
BaseType_t xIsBound )
{
BaseType_t xReturn;
if( ( pxSocket == NULL ) || ( pxSocket == FREERTOS_INVALID_SOCKET ) )
{
xReturn = pdFALSE;
}
else if( ( xIsBound != pdFALSE ) && !socketSOCKET_IS_BOUND( pxSocket ) )
{
/* The caller expects the socket to be bound, but it isn't. */
xReturn = pdFALSE;
}
else if( pxSocket->ucProtocol != ( uint8_t ) xProtocol )
{
/* Socket has a wrong type (UDP != TCP). */
xReturn = pdFALSE;
}
else
{
xReturn = pdTRUE;
}
return xReturn;
}
/*-----------------------------------------------------------*/
/**
* @brief Initialise the bound TCP/UDP socket lists.
*/
void vNetworkSocketsInit( void )
{
vListInitialise( &xBoundUDPSocketsList );
#if ( ipconfigUSE_TCP == 1 )
{
vListInitialise( &xBoundTCPSocketsList );
}
#endif /* ipconfigUSE_TCP == 1 */
}
/*-----------------------------------------------------------*/
/**
* @brief Determine the socket size for the given protocol.
*
* @param[in] xDomain: The domain for which the size of socket is being determined.
* @param[in] xType: Is this a datagram socket or a stream socket.
* @param[in] xProtocol: The protocol being used.
* @param[out] pxSocketSize: Pointer to a variable in which the size shall be returned
* if all checks pass.
*
* @return pdPASS if socket size was determined and put in the parameter pxSocketSize
* correctly, else pdFAIL.
*/
static BaseType_t prvDetermineSocketSize( BaseType_t xDomain,
BaseType_t xType,
BaseType_t xProtocol,
size_t * pxSocketSize )
{
BaseType_t xReturn = pdPASS;
FreeRTOS_Socket_t const * pxSocket = NULL;
/* Asserts must not appear before it has been determined that the network
* task is ready - otherwise the asserts will fail. */
if( xIPIsNetworkTaskReady() == pdFALSE )
{
xReturn = pdFAIL;
}
else
{
/* Only Ethernet is currently supported. */
configASSERT( xDomain == FREERTOS_AF_INET );
/* Check if the UDP socket-list has been initialised. */
configASSERT( listLIST_IS_INITIALISED( &xBoundUDPSocketsList ) );
#if ( ipconfigUSE_TCP == 1 )
{
/* Check if the TCP socket-list has been initialised. */
configASSERT( listLIST_IS_INITIALISED( &xBoundTCPSocketsList ) );
}
#endif /* ipconfigUSE_TCP == 1 */
if( xProtocol == FREERTOS_IPPROTO_UDP )
{
if( xType != FREERTOS_SOCK_DGRAM )
{
xReturn = pdFAIL;
configASSERT( xReturn == pdPASS );
}
/* In case a UDP socket is created, do not allocate space for TCP data. */
*pxSocketSize = ( sizeof( *pxSocket ) - sizeof( pxSocket->u ) ) + sizeof( pxSocket->u.xUDP );
}
#if ( ipconfigUSE_TCP == 1 )
else if( xProtocol == FREERTOS_IPPROTO_TCP )
{
if( xType != FREERTOS_SOCK_STREAM )
{
xReturn = pdFAIL;
configASSERT( xReturn == pdPASS );
}
*pxSocketSize = ( sizeof( *pxSocket ) - sizeof( pxSocket->u ) ) + sizeof( pxSocket->u.xTCP );
}
#endif /* ipconfigUSE_TCP == 1 */
else
{
xReturn = pdFAIL;
configASSERT( xReturn == pdPASS );
}
}
/* In case configASSERT() is not used */
( void ) xDomain;
( void ) pxSocket; /* Was only used for sizeof. */
return xReturn;
}
/*-----------------------------------------------------------*/
/**
* @brief allocate and initialise a socket.
*
* @param[in] xDomain: The domain in which the socket should be created.
* @param[in] xType: The type of the socket.
* @param[in] xProtocol: The protocol of the socket.
*
* @return FREERTOS_INVALID_SOCKET if the allocation failed, or if there was
* a parameter error, otherwise a valid socket.
*/
Socket_t FreeRTOS_socket( BaseType_t xDomain,
BaseType_t xType,
BaseType_t xProtocol )
{
FreeRTOS_Socket_t * pxSocket;
/* Note that this value will be over-written by the call to prvDetermineSocketSize. */
size_t uxSocketSize = 1;
EventGroupHandle_t xEventGroup;
Socket_t xReturn;
if( prvDetermineSocketSize( xDomain, xType, xProtocol, &uxSocketSize ) == pdFAIL )
{
xReturn = FREERTOS_INVALID_SOCKET;
}
else
{
/* Allocate the structure that will hold the socket information. The
* size depends on the type of socket: UDP sockets need less space. A
* define 'pvPortMallocSocket' will used to allocate the necessary space.
* By default it points to the FreeRTOS function 'pvPortMalloc()'. */
pxSocket = ipCAST_PTR_TO_TYPE_PTR( FreeRTOS_Socket_t, pvPortMallocSocket( uxSocketSize ) );
if( pxSocket == NULL )
{
xReturn = FREERTOS_INVALID_SOCKET;
iptraceFAILED_TO_CREATE_SOCKET();
}
else
{
xEventGroup = xEventGroupCreate();
if( xEventGroup == NULL )
{
vPortFreeSocket( pxSocket );
xReturn = FREERTOS_INVALID_SOCKET;
iptraceFAILED_TO_CREATE_EVENT_GROUP();
}
else
{
if( xProtocol == FREERTOS_IPPROTO_UDP )
{
iptraceMEM_STATS_CREATE( tcpSOCKET_UDP, pxSocket, uxSocketSize + sizeof( StaticEventGroup_t ) );
}
else
{
/* Lint wants at least a comment, in case the macro is empty. */
iptraceMEM_STATS_CREATE( tcpSOCKET_TCP, pxSocket, uxSocketSize + sizeof( StaticEventGroup_t ) );
}
/* Clear the entire space to avoid nulling individual entries. */
( void ) memset( pxSocket, 0, uxSocketSize );
pxSocket->xEventGroup = xEventGroup;
/* Initialise the socket's members. The semaphore will be created
* if the socket is bound to an address, for now the pointer to the
* semaphore is just set to NULL to show it has not been created. */
if( xProtocol == FREERTOS_IPPROTO_UDP )
{
vListInitialise( &( pxSocket->u.xUDP.xWaitingPacketsList ) );
#if ( ipconfigUDP_MAX_RX_PACKETS > 0U )
{
pxSocket->u.xUDP.uxMaxPackets = ( UBaseType_t ) ipconfigUDP_MAX_RX_PACKETS;
}
#endif /* ipconfigUDP_MAX_RX_PACKETS > 0 */
}
vListInitialiseItem( &( pxSocket->xBoundSocketListItem ) );
listSET_LIST_ITEM_OWNER( &( pxSocket->xBoundSocketListItem ), ipPOINTER_CAST( void *, pxSocket ) );
pxSocket->xReceiveBlockTime = ipconfigSOCK_DEFAULT_RECEIVE_BLOCK_TIME;
pxSocket->xSendBlockTime = ipconfigSOCK_DEFAULT_SEND_BLOCK_TIME;
pxSocket->ucSocketOptions = ( uint8_t ) FREERTOS_SO_UDPCKSUM_OUT;
pxSocket->ucProtocol = ( uint8_t ) xProtocol; /* protocol: UDP or TCP */
#if ( ipconfigUSE_TCP == 1 )
{
if( xProtocol == FREERTOS_IPPROTO_TCP )
{
/* StreamSize is expressed in number of bytes */
/* Round up buffer sizes to nearest multiple of MSS */
pxSocket->u.xTCP.usCurMSS = ( uint16_t ) ipconfigTCP_MSS;
pxSocket->u.xTCP.usInitMSS = ( uint16_t ) ipconfigTCP_MSS;
pxSocket->u.xTCP.uxRxStreamSize = ( size_t ) ipconfigTCP_RX_BUFFER_LENGTH;
pxSocket->u.xTCP.uxTxStreamSize = ( size_t ) FreeRTOS_round_up( ipconfigTCP_TX_BUFFER_LENGTH, ipconfigTCP_MSS );
/* Use half of the buffer size of the TCP windows */
#if ( ipconfigUSE_TCP_WIN == 1 )
{
pxSocket->u.xTCP.uxRxWinSize = FreeRTOS_max_uint32( 1UL, ( uint32_t ) ( pxSocket->u.xTCP.uxRxStreamSize / 2U ) / ipconfigTCP_MSS );
pxSocket->u.xTCP.uxTxWinSize = FreeRTOS_max_uint32( 1UL, ( uint32_t ) ( pxSocket->u.xTCP.uxTxStreamSize / 2U ) / ipconfigTCP_MSS );
}
#else
{
pxSocket->u.xTCP.uxRxWinSize = 1U;
pxSocket->u.xTCP.uxTxWinSize = 1U;
}
#endif
/* The above values are just defaults, and can be overridden by
* calling FreeRTOS_setsockopt(). No buffers will be allocated until a
* socket is connected and data is exchanged. */
}
}
#endif /* ipconfigUSE_TCP == 1 */
xReturn = pxSocket;
}
}
}
/* Remove compiler warnings in the case the configASSERT() is not defined. */
( void ) xDomain;
return xReturn;
}
/*-----------------------------------------------------------*/
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
/**
* @brief Create a socket set.
*
* @return The new socket set which was created, or NULL when allocation has failed.
*/
SocketSet_t FreeRTOS_CreateSocketSet( void )
{
SocketSelect_t * pxSocketSet;
pxSocketSet = ipCAST_PTR_TO_TYPE_PTR( SocketSelect_t, pvPortMalloc( sizeof( *pxSocketSet ) ) );
if( pxSocketSet != NULL )
{
( void ) memset( pxSocketSet, 0, sizeof( *pxSocketSet ) );
pxSocketSet->xSelectGroup = xEventGroupCreate();
if( pxSocketSet->xSelectGroup == NULL )
{
vPortFree( pxSocketSet );
pxSocketSet = NULL;
}
else
{
/* Lint wants at least a comment, in case the macro is empty. */
iptraceMEM_STATS_CREATE( tcpSOCKET_SET, pxSocketSet, sizeof( *pxSocketSet ) + sizeof( StaticEventGroup_t ) );
}
}
return ( SocketSet_t ) pxSocketSet;
}
#endif /* ipconfigSUPPORT_SELECT_FUNCTION == 1 */
/*-----------------------------------------------------------*/
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
/**
* @brief Delete a given socket set.
*
* @param[in] xSocketSet: The socket set being deleted.
*/
void FreeRTOS_DeleteSocketSet( SocketSet_t xSocketSet )
{
SocketSelect_t * pxSocketSet = ( SocketSelect_t * ) xSocketSet;
iptraceMEM_STATS_DELETE( pxSocketSet );
vEventGroupDelete( pxSocketSet->xSelectGroup );
vPortFree( pxSocketSet );
}
#endif /* ipconfigSUPPORT_SELECT_FUNCTION == 1 */
/*-----------------------------------------------------------*/
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
/**
* @brief Add a socket to a set.
*
* @param[in] xSocket: The socket being added.
* @param[in] xSocketSet: The socket set being added to.
* @param[in] xBitsToSet: The event bits to set, a combination of the values defined
* in 'eSelectEvent_t', for read, write, exception, etc.
*/
void FreeRTOS_FD_SET( Socket_t xSocket,
SocketSet_t xSocketSet,
EventBits_t xBitsToSet )
{
FreeRTOS_Socket_t * pxSocket = ( FreeRTOS_Socket_t * ) xSocket;
SocketSelect_t * pxSocketSet = ( SocketSelect_t * ) xSocketSet;
configASSERT( pxSocket != NULL );
configASSERT( xSocketSet != NULL );
/* Make sure we're not adding bits which are reserved for internal use,
* such as eSELECT_CALL_IP */
pxSocket->xSelectBits |= xBitsToSet & ( ( EventBits_t ) eSELECT_ALL );
if( ( pxSocket->xSelectBits & ( ( EventBits_t ) eSELECT_ALL ) ) != ( EventBits_t ) 0U )
{
/* Adding a socket to a socket set. */
pxSocket->pxSocketSet = ( SocketSelect_t * ) xSocketSet;
/* Now have the IP-task call vSocketSelect() to see if the set contains
* any sockets which are 'ready' and set the proper bits. */
prvFindSelectedSocket( pxSocketSet );
}
}
#endif /* ipconfigSUPPORT_SELECT_FUNCTION == 1 */
/*-----------------------------------------------------------*/
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
/**
* @brief Clear select bits for a socket. If the mask becomes 0,
* remove the socket from the set.
*
* @param[in] xSocket: The socket whose select bits are being cleared.
* @param[in] xSocketSet: The socket set of the socket.
* @param[in] xBitsToClear: The bits to be cleared. Every '1' means that the
* corresponding bit will be cleared. See 'eSelectEvent_t' for
* the possible values.
*/
void FreeRTOS_FD_CLR( Socket_t xSocket,
SocketSet_t xSocketSet,
EventBits_t xBitsToClear )
{
FreeRTOS_Socket_t * pxSocket = ( FreeRTOS_Socket_t * ) xSocket;
configASSERT( pxSocket != NULL );
configASSERT( xSocketSet != NULL );
pxSocket->xSelectBits &= ~( xBitsToClear & ( ( EventBits_t ) eSELECT_ALL ) );
if( ( pxSocket->xSelectBits & ( ( EventBits_t ) eSELECT_ALL ) ) != ( EventBits_t ) 0U )
{
pxSocket->pxSocketSet = ( SocketSelect_t * ) xSocketSet;
}
else
{
/* disconnect it from the socket set */
pxSocket->pxSocketSet = NULL;
}
}
#endif /* ipconfigSUPPORT_SELECT_FUNCTION == 1 */
/*-----------------------------------------------------------*/
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
/**
* @brief Test if a socket belongs to a socket-set and if so, which event bit(s)
* are set.
*
* @param[in] xSocket: The socket of interest.
* @param[in] xSocketSet: The socket set to which the socket belongs.
*
* @return If the socket belongs to the socket set: the event bits, otherwise zero.
*/
EventBits_t FreeRTOS_FD_ISSET( Socket_t xSocket,
SocketSet_t xSocketSet )
{
EventBits_t xReturn;
const FreeRTOS_Socket_t * pxSocket = ( const FreeRTOS_Socket_t * ) xSocket;
configASSERT( pxSocket != NULL );
configASSERT( xSocketSet != NULL );
if( xSocketSet == ( SocketSet_t ) pxSocket->pxSocketSet )
{
/* Make sure we're not adding bits which are reserved for internal
* use. */
xReturn = pxSocket->xSocketBits & ( ( EventBits_t ) eSELECT_ALL );
}
else
{
xReturn = 0;
}
return xReturn;
}
#endif /* ipconfigSUPPORT_SELECT_FUNCTION == 1 */
/*-----------------------------------------------------------*/
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
/**
* @brief The select() statement: wait for an event to occur on any of the sockets
* included in a socket set.
*
* @param[in] xSocketSet: The socket set including the sockets on which we are
* waiting for an event to occur.
* @param[in] xBlockTimeTicks: Maximum time ticks to wait for an event to occur.
* If the value is 'portMAX_DELAY' then the function will wait
* indefinitely for an event to occur.
*
* @return The socket which might have triggered the event bit.
*/
BaseType_t FreeRTOS_select( SocketSet_t xSocketSet,
TickType_t xBlockTimeTicks )
{
TimeOut_t xTimeOut;
TickType_t xRemainingTime;
SocketSelect_t * pxSocketSet = ( SocketSelect_t * ) xSocketSet;
EventBits_t uxResult;
configASSERT( xSocketSet != NULL );
/* Only in the first round, check for non-blocking */
xRemainingTime = xBlockTimeTicks;
/* Fetch the current time */
vTaskSetTimeOutState( &xTimeOut );
for( ; ; )
{
/* Find a socket which might have triggered the bit
* This function might return immediately or block for a limited time */
uxResult = xEventGroupWaitBits( pxSocketSet->xSelectGroup, ( ( EventBits_t ) eSELECT_ALL ), pdFALSE, pdFALSE, xRemainingTime );
#if ( ipconfigSUPPORT_SIGNALS != 0 )
{
if( ( uxResult & ( ( EventBits_t ) eSELECT_INTR ) ) != 0U )
{
( void ) xEventGroupClearBits( pxSocketSet->xSelectGroup, ( EventBits_t ) eSELECT_INTR );
FreeRTOS_debug_printf( ( "FreeRTOS_select: interrupted\n" ) );
break;
}
}
#endif /* ipconfigSUPPORT_SIGNALS */
/* Have the IP-task find the socket which had an event */
prvFindSelectedSocket( pxSocketSet );
uxResult = xEventGroupGetBits( pxSocketSet->xSelectGroup );
if( uxResult != 0U )
{
break;
}
/* Has the timeout been reached? */
if( xTaskCheckForTimeOut( &xTimeOut, &xRemainingTime ) != pdFALSE )
{
break;
}
}
return ( BaseType_t ) uxResult;
}
#endif /* ipconfigSUPPORT_SELECT_FUNCTION */
/*-----------------------------------------------------------*/
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
/**
* @brief Send a message to the IP-task to have it check all sockets belonging to
* 'pxSocketSet'
*
* @param[in] pxSocketSet: The socket set being asked to check.
*/
static void prvFindSelectedSocket( SocketSelect_t * pxSocketSet )
{
IPStackEvent_t xSelectEvent;
#if ( ipconfigSELECT_USES_NOTIFY != 0 )
SocketSelectMessage_t xSelectMessage;
#endif
xSelectEvent.eEventType = eSocketSelectEvent;
#if ( ipconfigSELECT_USES_NOTIFY != 0 )
{
xSelectMessage.pxSocketSet = pxSocketSet;
xSelectMessage.xTaskhandle = xTaskGetCurrentTaskHandle();
xSelectEvent.pvData = &( xSelectMessage );
}
#else
{
xSelectEvent.pvData = pxSocketSet;
/* while the IP-task works on the request, the API will block on
* 'eSELECT_CALL_IP'. So clear it first. */
( void ) xEventGroupClearBits( pxSocketSet->xSelectGroup, ( BaseType_t ) eSELECT_CALL_IP );
}
#endif /* if ( ipconfigSELECT_USES_NOTIFY != 0 ) */
/* Now send the socket select event */
if( xSendEventStructToIPTask( &xSelectEvent, ( TickType_t ) portMAX_DELAY ) == pdFAIL )
{
/* Oops, we failed to wake-up the IP task. No use to wait for it. */
FreeRTOS_debug_printf( ( "prvFindSelectedSocket: failed\n" ) );
}
else
{
/* As soon as the IP-task is ready, it will set 'eSELECT_CALL_IP' to
* wakeup the calling API */
#if ( ipconfigSELECT_USES_NOTIFY != 0 )
{
( void ) ulTaskNotifyTake( pdFALSE, portMAX_DELAY );
}
#else
{
( void ) xEventGroupWaitBits( pxSocketSet->xSelectGroup, ( BaseType_t ) eSELECT_CALL_IP, pdTRUE, pdFALSE, portMAX_DELAY );
}
#endif
}
}
#endif /* ipconfigSUPPORT_SELECT_FUNCTION == 1 */
/*-----------------------------------------------------------*/
/**
* @brief Receive data from a bound socket. In this library, the function
* can only be used with connection-less sockets (UDP). For TCP sockets,
* please use FreeRTOS_recv().
*
* @param[in] xSocket: The socket to which the data is sent i.e. the
* listening socket.
* @param[out] pvBuffer: The buffer in which the data being received is to
* be stored.
* @param[in] uxBufferLength: The length of the buffer.
* @param[in] xFlags: The flags to indicate preferences while calling this function.
* @param[out] pxSourceAddress: The source address from which the data is being sent.
* @param[out] pxSourceAddressLength: This parameter is used only to adhere to Berkeley
* sockets standard. It is not used internally.
*
* @return The number of bytes received. Or else, an error code is returned. When it
* returns a negative value, the cause can be looked-up in
* 'FreeRTOS_errno_TCP.h'.
*/
int32_t FreeRTOS_recvfrom( Socket_t xSocket,
void * pvBuffer,
size_t uxBufferLength,
BaseType_t xFlags,
struct freertos_sockaddr * pxSourceAddress,
socklen_t * pxSourceAddressLength )
{
BaseType_t lPacketCount;
NetworkBufferDescriptor_t * pxNetworkBuffer;
const void * pvCopySource;
FreeRTOS_Socket_t const * pxSocket = xSocket;
TickType_t xRemainingTime = ( TickType_t ) 0; /* Obsolete assignment, but some compilers output a warning if its not done. */
BaseType_t xTimed = pdFALSE;
TimeOut_t xTimeOut;
int32_t lReturn;
EventBits_t xEventBits = ( EventBits_t ) 0;
size_t uxPayloadLength;
if( prvValidSocket( pxSocket, FREERTOS_IPPROTO_UDP, pdTRUE ) == pdFALSE )
{
lReturn = -pdFREERTOS_ERRNO_EINVAL;
}
else
{
lPacketCount = ( BaseType_t ) listCURRENT_LIST_LENGTH( &( pxSocket->u.xUDP.xWaitingPacketsList ) );
/* The function prototype is designed to maintain the expected Berkeley
* sockets standard, but this implementation does not use all the parameters. */
( void ) pxSourceAddressLength;
while( lPacketCount == 0 )
{
if( xTimed == pdFALSE )
{
/* Check to see if the socket is non blocking on the first
* iteration. */
xRemainingTime = pxSocket->xReceiveBlockTime;
if( xRemainingTime == ( TickType_t ) 0 )
{
#if ( ipconfigSUPPORT_SIGNALS != 0 )
{
/* Just check for the interrupt flag. */
xEventBits = xEventGroupWaitBits( pxSocket->xEventGroup, ( EventBits_t ) eSOCKET_INTR,
pdTRUE /*xClearOnExit*/, pdFALSE /*xWaitAllBits*/, socketDONT_BLOCK );
}
#endif /* ipconfigSUPPORT_SIGNALS */
break;
}
if( ( ( ( UBaseType_t ) xFlags ) & ( ( UBaseType_t ) FREERTOS_MSG_DONTWAIT ) ) != 0U )
{
break;
}
/* To ensure this part only executes once. */
xTimed = pdTRUE;
/* Fetch the current time. */
vTaskSetTimeOutState( &xTimeOut );
}
/* Wait for arrival of data. While waiting, the IP-task may set the
* 'eSOCKET_RECEIVE' bit in 'xEventGroup', if it receives data for this
* socket, thus unblocking this API call. */
xEventBits = xEventGroupWaitBits( pxSocket->xEventGroup, ( ( EventBits_t ) eSOCKET_RECEIVE ) | ( ( EventBits_t ) eSOCKET_INTR ),
pdTRUE /*xClearOnExit*/, pdFALSE /*xWaitAllBits*/, xRemainingTime );
#if ( ipconfigSUPPORT_SIGNALS != 0 )
{
if( ( xEventBits & ( EventBits_t ) eSOCKET_INTR ) != 0U )
{
if( ( xEventBits & ( EventBits_t ) eSOCKET_RECEIVE ) != 0U )
{
/* Shouldn't have cleared the eSOCKET_RECEIVE flag. */
( void ) xEventGroupSetBits( pxSocket->xEventGroup, ( EventBits_t ) eSOCKET_RECEIVE );
}
break;
}
}
#else /* if ( ipconfigSUPPORT_SIGNALS != 0 ) */
{
( void ) xEventBits;
}
#endif /* ipconfigSUPPORT_SIGNALS */
lPacketCount = ( BaseType_t ) listCURRENT_LIST_LENGTH( &( pxSocket->u.xUDP.xWaitingPacketsList ) );
if( lPacketCount != 0 )
{
break;
}
/* Has the timeout been reached ? */
if( xTaskCheckForTimeOut( &xTimeOut, &xRemainingTime ) != pdFALSE )
{
break;
}
} /* while( lPacketCount == 0 ) */
if( lPacketCount != 0 )
{
taskENTER_CRITICAL();
{
/* The owner of the list item is the network buffer. */
pxNetworkBuffer = ipCAST_PTR_TO_TYPE_PTR( NetworkBufferDescriptor_t, listGET_OWNER_OF_HEAD_ENTRY( &( pxSocket->u.xUDP.xWaitingPacketsList ) ) );
if( ( ( UBaseType_t ) xFlags & ( UBaseType_t ) FREERTOS_MSG_PEEK ) == 0U )
{
/* Remove the network buffer from the list of buffers waiting to
* be processed by the socket. */
( void ) uxListRemove( &( pxNetworkBuffer->xBufferListItem ) );
}
}
taskEXIT_CRITICAL();
/* The returned value is the length of the payload data, which is
* calculated at the total packet size minus the headers.
* The validity of `xDataLength` prvProcessIPPacket has been confirmed
* in 'prvProcessIPPacket()'. */
uxPayloadLength = pxNetworkBuffer->xDataLength - sizeof( UDPPacket_t );
lReturn = ( int32_t ) uxPayloadLength;
if( pxSourceAddress != NULL )
{
pxSourceAddress->sin_port = pxNetworkBuffer->usPort;
pxSourceAddress->sin_addr = pxNetworkBuffer->ulIPAddress;
}
if( ( ( UBaseType_t ) xFlags & ( UBaseType_t ) FREERTOS_ZERO_COPY ) == 0U )
{
/* The zero copy flag is not set. Truncate the length if it won't
* fit in the provided buffer. */
if( lReturn > ( int32_t ) uxBufferLength )
{
iptraceRECVFROM_DISCARDING_BYTES( ( uxBufferLength - lReturn ) );
lReturn = ( int32_t ) uxBufferLength;
}
/* Copy the received data into the provided buffer, then release the
* network buffer. */
pvCopySource = ( const void * ) &pxNetworkBuffer->pucEthernetBuffer[ ipUDP_PAYLOAD_OFFSET_IPv4 ];
( void ) memcpy( pvBuffer, pvCopySource, ( size_t ) lReturn );
if( ( ( UBaseType_t ) xFlags & ( UBaseType_t ) FREERTOS_MSG_PEEK ) == 0U )
{
vReleaseNetworkBufferAndDescriptor( pxNetworkBuffer );
}
}
else
{
/* The zero copy flag was set. pvBuffer is not a buffer into which
* the received data can be copied, but a pointer that must be set to
* point to the buffer in which the received data has already been
* placed. */
*( ( void ** ) pvBuffer ) = ipPOINTER_CAST( void *, &( pxNetworkBuffer->pucEthernetBuffer[ ipUDP_PAYLOAD_OFFSET_IPv4 ] ) );
}
}
#if ( ipconfigSUPPORT_SIGNALS != 0 )
else if( ( xEventBits & ( EventBits_t ) eSOCKET_INTR ) != 0U )
{
lReturn = -pdFREERTOS_ERRNO_EINTR;
iptraceRECVFROM_INTERRUPTED();
}
#endif /* ipconfigSUPPORT_SIGNALS */
else
{
lReturn = -pdFREERTOS_ERRNO_EWOULDBLOCK;
iptraceRECVFROM_TIMEOUT();
}
}
return lReturn;
}
/*-----------------------------------------------------------*/
/**
* @brief Send data to a socket. The socket must have already been created by a
* successful call to FreeRTOS_socket(). It works for UDP-sockets only.
*
* @param[in] xSocket: The socket being sent to.
* @param[in] pvBuffer: Pointer to the data being sent.
* @param[in] uxTotalDataLength: Length (in bytes) of the data being sent.
* @param[in] xFlags: Flags used to communicate preferences to the function.
* Possibly FREERTOS_MSG_DONTWAIT and/or FREERTOS_ZERO_COPY.
* @param[in] pxDestinationAddress: The address to which the data is to be sent.
* @param[in] xDestinationAddressLength: This parameter is present to adhere to the
* Berkeley sockets standard. Else, it is not used.
*
* @return When positive: the total number of bytes sent, when negative an error
* has occurred: it can be looked-up in 'FreeRTOS_errno_TCP.h'.
*/
int32_t FreeRTOS_sendto( Socket_t xSocket,
const void * pvBuffer,
size_t uxTotalDataLength,
BaseType_t xFlags,
const struct freertos_sockaddr * pxDestinationAddress,
socklen_t xDestinationAddressLength )
{
NetworkBufferDescriptor_t * pxNetworkBuffer;
void * pvCopyDest;
IPStackEvent_t xStackTxEvent = { eStackTxEvent, NULL };
TimeOut_t xTimeOut;
TickType_t xTicksToWait;
int32_t lReturn = 0;
FreeRTOS_Socket_t const * pxSocket;
const size_t uxMaxPayloadLength = ipMAX_UDP_PAYLOAD_LENGTH;
const size_t uxPayloadOffset = ipUDP_PAYLOAD_OFFSET_IPv4;
pxSocket = ( FreeRTOS_Socket_t * ) xSocket;
/* The function prototype is designed to maintain the expected Berkeley
* sockets standard, but this implementation does not use all the
* parameters. */
( void ) xDestinationAddressLength;
configASSERT( pvBuffer != NULL );
if( uxTotalDataLength <= ( size_t ) uxMaxPayloadLength )
{
/* If the socket is not already bound to an address, bind it now.
* Passing NULL as the address parameter tells FreeRTOS_bind() to select
* the address to bind to. */
if( socketSOCKET_IS_BOUND( pxSocket ) ||
( FreeRTOS_bind( xSocket, NULL, 0U ) == 0 ) )
{
xTicksToWait = pxSocket->xSendBlockTime;
#if ( ipconfigUSE_CALLBACKS != 0 )
{
if( xIsCallingFromIPTask() != pdFALSE )
{
/* If this send function is called from within a call-back
* handler it may not block, otherwise chances would be big to
* get a deadlock: the IP-task waiting for itself. */
xTicksToWait = ( TickType_t ) 0;
}
}
#endif /* ipconfigUSE_CALLBACKS */
if( ( ( UBaseType_t ) xFlags & ( UBaseType_t ) FREERTOS_MSG_DONTWAIT ) != 0U )
{
xTicksToWait = ( TickType_t ) 0;
}
if( ( ( UBaseType_t ) xFlags & ( UBaseType_t ) FREERTOS_ZERO_COPY ) == 0U )
{
/* Zero copy is not set, so obtain a network buffer into
* which the payload will be copied. */
vTaskSetTimeOutState( &xTimeOut );
/* Block until a buffer becomes available, or until a
* timeout has been reached */
pxNetworkBuffer = pxGetNetworkBufferWithDescriptor( uxPayloadOffset + uxTotalDataLength, xTicksToWait );
if( pxNetworkBuffer != NULL )
{
pvCopyDest = ( void * ) &pxNetworkBuffer->pucEthernetBuffer[ uxPayloadOffset ];
( void ) memcpy( pvCopyDest, pvBuffer, uxTotalDataLength );
if( xTaskCheckForTimeOut( &xTimeOut, &xTicksToWait ) == pdTRUE )
{
/* The entire block time has been used up. */
xTicksToWait = ( TickType_t ) 0;
}
}
}
else
{
/* When zero copy is used, pvBuffer is a pointer to the
* payload of a buffer that has already been obtained from the
* stack. Obtain the network buffer pointer from the buffer. */
pxNetworkBuffer = pxUDPPayloadBuffer_to_NetworkBuffer( pvBuffer );
}
if( pxNetworkBuffer != NULL )
{
/* xDataLength is the size of the total packet, including the Ethernet header. */
pxNetworkBuffer->xDataLength = uxTotalDataLength + sizeof( UDPPacket_t );
pxNetworkBuffer->usPort = pxDestinationAddress->sin_port;
pxNetworkBuffer->usBoundPort = ( uint16_t ) socketGET_SOCKET_PORT( pxSocket );
pxNetworkBuffer->ulIPAddress = pxDestinationAddress->sin_addr;
/* The socket options are passed to the IP layer in the
* space that will eventually get used by the Ethernet header. */
pxNetworkBuffer->pucEthernetBuffer[ ipSOCKET_OPTIONS_OFFSET ] = pxSocket->ucSocketOptions;
/* Tell the networking task that the packet needs sending. */
xStackTxEvent.pvData = pxNetworkBuffer;
/* Ask the IP-task to send this packet */
if( xSendEventStructToIPTask( &xStackTxEvent, xTicksToWait ) == pdPASS )
{
/* The packet was successfully sent to the IP task. */
lReturn = ( int32_t ) uxTotalDataLength;
#if ( ipconfigUSE_CALLBACKS == 1 )
{
if( ipconfigIS_VALID_PROG_ADDRESS( pxSocket->u.xUDP.pxHandleSent ) )
{
pxSocket->u.xUDP.pxHandleSent( xSocket, uxTotalDataLength );
}
}
#endif /* ipconfigUSE_CALLBACKS */
}
else
{
/* If the buffer was allocated in this function, release
* it. */
if( ( ( UBaseType_t ) xFlags & ( UBaseType_t ) FREERTOS_ZERO_COPY ) == 0U )
{
vReleaseNetworkBufferAndDescriptor( pxNetworkBuffer );
}
iptraceSTACK_TX_EVENT_LOST( ipSTACK_TX_EVENT );
}
}
else
{
/* If errno was available, errno would be set to
* FREERTOS_ENOPKTS. As it is, the function must return the
* number of transmitted bytes, so the calling function knows
* how much data was actually sent. */
iptraceNO_BUFFER_FOR_SENDTO();
}
}
else
{
/* No comment. */
iptraceSENDTO_SOCKET_NOT_BOUND();
}
}
else
{
/* The data is longer than the available buffer space. */
iptraceSENDTO_DATA_TOO_LONG();
}
return lReturn;
} /* Tested */
/*-----------------------------------------------------------*/
/**
* @brief binds a socket to a local port number. If port 0 is provided,
* a system provided port number will be assigned. This function
* can be used for both UDP and TCP sockets. The actual binding
* will be performed by the IP-task to avoid mutual access to the
* bound-socket-lists (xBoundUDPSocketsList or xBoundTCPSocketsList).
*
* @param[in] xSocket: The socket being bound.
* @param[in] pxAddress: The address struct carrying the port number to which
* this socket is to be bound.
* @param[in] xAddressLength: This parameter is not used internally. The
* function signature is used to adhere to standard
* Berkeley sockets API.
*
* @return The return value is 0 if the bind is successful.
* If some error occurred, then a negative value is returned.
*/
BaseType_t FreeRTOS_bind( Socket_t xSocket,
struct freertos_sockaddr const * pxAddress,
socklen_t xAddressLength )
{
IPStackEvent_t xBindEvent;
FreeRTOS_Socket_t * pxSocket = ( FreeRTOS_Socket_t * ) xSocket;
BaseType_t xReturn = 0;
( void ) xAddressLength;
configASSERT( xIsCallingFromIPTask() == pdFALSE );
if( ( pxSocket == NULL ) || ( pxSocket == FREERTOS_INVALID_SOCKET ) )
{
xReturn = -pdFREERTOS_ERRNO_EINVAL;
}
/* Once a socket is bound to a port, it can not be bound to a different
* port number */
else if( socketSOCKET_IS_BOUND( pxSocket ) )
{
/* The socket is already bound. */
FreeRTOS_debug_printf( ( "vSocketBind: Socket already bound to %d\n", pxSocket->usLocalPort ) );
xReturn = -pdFREERTOS_ERRNO_EINVAL;
}
else
{
/* Prepare a messages to the IP-task in order to perform the binding.
* The desired port number will be passed in usLocalPort. */
xBindEvent.eEventType = eSocketBindEvent;
xBindEvent.pvData = xSocket;
if( pxAddress != NULL )
{
pxSocket->usLocalPort = FreeRTOS_ntohs( pxAddress->sin_port );
}
else
{
/* Caller wants to bind to a random port number. */
pxSocket->usLocalPort = 0U;
}
/* portMAX_DELAY is used as a the time-out parameter, as binding *must*
* succeed before the socket can be used. _RB_ The use of an infinite
* block time needs be changed as it could result in the task hanging. */
if( xSendEventStructToIPTask( &xBindEvent, ( TickType_t ) portMAX_DELAY ) == pdFAIL )
{
/* Failed to wake-up the IP-task, no use to wait for it */
FreeRTOS_debug_printf( ( "FreeRTOS_bind: send event failed\n" ) );
xReturn = -pdFREERTOS_ERRNO_ECANCELED;
}
else
{
/* The IP-task will set the 'eSOCKET_BOUND' bit when it has done its
* job. */
( void ) xEventGroupWaitBits( pxSocket->xEventGroup, ( EventBits_t ) eSOCKET_BOUND, pdTRUE /*xClearOnExit*/, pdFALSE /*xWaitAllBits*/, portMAX_DELAY );
if( !socketSOCKET_IS_BOUND( pxSocket ) )
{
xReturn = -pdFREERTOS_ERRNO_EINVAL;
}
}
}
return xReturn;
}
/*-----------------------------------------------------------*/
/**
* @brief Internal version of bind() that should not be called directly.
* 'xInternal' is used for TCP sockets only: it allows to have several
* (connected) child sockets bound to the same server port.
*
* @param[in] pxSocket: The socket is to be bound.
* @param[in] pxBindAddress: The port to which this socket should be bound.
* @param[in] uxAddressLength: The address length.
* @param[in] xInternal: pdTRUE is calling internally, else pdFALSE.
*
* @return If the socket was bound to a port successfully, then a 0 is returned.
* Or else, an error code is returned.
*/
BaseType_t vSocketBind( FreeRTOS_Socket_t * pxSocket,
struct freertos_sockaddr * pxBindAddress,
size_t uxAddressLength,
BaseType_t xInternal )
{
BaseType_t xReturn = 0; /* In Berkeley sockets, 0 means pass for bind(). */
List_t * pxSocketList;
struct freertos_sockaddr * pxAddress = pxBindAddress;
#if ( ipconfigALLOW_SOCKET_SEND_WITHOUT_BIND == 1 )
struct freertos_sockaddr xAddress;
#endif /* ipconfigALLOW_SOCKET_SEND_WITHOUT_BIND */
#if ( ipconfigUSE_TCP == 1 )
if( pxSocket->ucProtocol == ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
pxSocketList = &xBoundTCPSocketsList;
}
else
#endif /* ipconfigUSE_TCP == 1 */
{
pxSocketList = &xBoundUDPSocketsList;
}
/* The function prototype is designed to maintain the expected Berkeley
* sockets standard, but this implementation does not use all the parameters. */
( void ) uxAddressLength;
configASSERT( pxSocket != NULL );
configASSERT( pxSocket != FREERTOS_INVALID_SOCKET );
#if ( ipconfigALLOW_SOCKET_SEND_WITHOUT_BIND == 1 )
{
/* pxAddress will be NULL if sendto() was called on a socket without the
* socket being bound to an address. In this case, automatically allocate
* an address to the socket. There is a small chance that the allocated
* port will already be in use - if that is the case, then the check below
* [pxListFindListItemWithValue()] will result in an error being returned. */
if( pxAddress == NULL )
{
pxAddress = &xAddress;
/* Put the port to zero to be assigned later. */
pxAddress->sin_port = 0U;
}
}
#endif /* ipconfigALLOW_SOCKET_SEND_WITHOUT_BIND == 1 */
/* Sockets must be bound before calling FreeRTOS_sendto() if
* ipconfigALLOW_SOCKET_SEND_WITHOUT_BIND is not set to 1. */
configASSERT( pxAddress != NULL );
#if ( ipconfigALLOW_SOCKET_SEND_WITHOUT_BIND == 1 )
/* pxAddress is not NULL, no testing needed. */
#else
if( pxAddress != NULL )
#endif
{
/* Add a do-while loop to facilitate use of 'break' statements. */
do
{
if( pxAddress->sin_port == 0U )
{
pxAddress->sin_port = prvGetPrivatePortNumber( ( BaseType_t ) pxSocket->ucProtocol );
if( pxAddress->sin_port == ( uint16_t ) 0U )
{
xReturn = -pdFREERTOS_ERRNO_EADDRNOTAVAIL;
break;
}
}
/* If vSocketBind() is called from the API FreeRTOS_bind() it has been
* confirmed that the socket was not yet bound to a port. If it is called
* from the IP-task, no such check is necessary. */
/* Check to ensure the port is not already in use. If the bind is
* called internally, a port MAY be used by more than one socket. */
if( ( ( xInternal == pdFALSE ) || ( pxSocket->ucProtocol != ( uint8_t ) FREERTOS_IPPROTO_TCP ) ) &&
( pxListFindListItemWithValue( pxSocketList, ( TickType_t ) pxAddress->sin_port ) != NULL ) )
{
FreeRTOS_debug_printf( ( "vSocketBind: %sP port %d in use\n",
( pxSocket->ucProtocol == ( uint8_t ) FREERTOS_IPPROTO_TCP ) ? "TC" : "UD",
FreeRTOS_ntohs( pxAddress->sin_port ) ) );
xReturn = -pdFREERTOS_ERRNO_EADDRINUSE;
}
else
{
/* Allocate the port number to the socket.
* This macro will set 'xBoundSocketListItem->xItemValue' */
socketSET_SOCKET_PORT( pxSocket, pxAddress->sin_port );
/* And also store it in a socket field 'usLocalPort' in host-byte-order,
* mostly used for logging and debugging purposes */
pxSocket->usLocalPort = FreeRTOS_ntohs( pxAddress->sin_port );
/* Add the socket to the list of bound ports. */
{
/* If the network driver can iterate through 'xBoundUDPSocketsList',
* by calling xPortHasUDPSocket() then the IP-task must temporarily
* suspend the scheduler to keep the list in a consistent state. */
#if ( ipconfigETHERNET_DRIVER_FILTERS_PACKETS == 1 )
{
vTaskSuspendAll();
}
#endif /* ipconfigETHERNET_DRIVER_FILTERS_PACKETS */
/* Add the socket to 'xBoundUDPSocketsList' or 'xBoundTCPSocketsList' */
vListInsertEnd( pxSocketList, &( pxSocket->xBoundSocketListItem ) );
#if ( ipconfigETHERNET_DRIVER_FILTERS_PACKETS == 1 )
{
( void ) xTaskResumeAll();
}
#endif /* ipconfigETHERNET_DRIVER_FILTERS_PACKETS */
}
}
} while( ipFALSE_BOOL );
}
#if ( ipconfigALLOW_SOCKET_SEND_WITHOUT_BIND == 0 )
else
{
xReturn = -pdFREERTOS_ERRNO_EADDRNOTAVAIL;
FreeRTOS_debug_printf( ( "vSocketBind: Socket no addr\n" ) );
}
#endif
if( xReturn != 0 )
{
iptraceBIND_FAILED( xSocket, ( FreeRTOS_ntohs( pxAddress->sin_port ) ) );
}
return xReturn;
} /* Tested */
/*-----------------------------------------------------------*/
/**
* @brief Close a socket and free the allocated space. In case of a TCP socket:
* the connection will not be closed automatically. Subsequent messages
* for the closed socket will be responded to with a RST. The IP-task
* will actually close the socket, after receiving a 'eSocketCloseEvent'
* message.
*
* @param[in] xSocket: the socket being closed.
*
* @return There are three distinct values which can be returned:
* 0: If the xSocket is NULL/invalid.
* 1: If the socket was successfully closed (read the brief above).
* -1: If the socket was valid but could not be closed because the message
* could not be delivered to the IP-task. Try again later.
*/
BaseType_t FreeRTOS_closesocket( Socket_t xSocket )
{
BaseType_t xResult;
#if ( ipconfigUSE_TCP == 1 ) && ( ipconfigUSE_CALLBACKS == 1 )
FreeRTOS_Socket_t * pxSocket = ( FreeRTOS_Socket_t * ) xSocket;
#endif
IPStackEvent_t xCloseEvent;
xCloseEvent.eEventType = eSocketCloseEvent;
xCloseEvent.pvData = xSocket;
if( ( xSocket == NULL ) || ( xSocket == FREERTOS_INVALID_SOCKET ) )
{
xResult = 0;
}
else
{
#if ( ( ipconfigUSE_TCP == 1 ) && ( ipconfigUSE_CALLBACKS == 1 ) )
{
if( pxSocket->ucProtocol == ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
/* Make sure that IP-task won't call the user callback's anymore */
pxSocket->u.xTCP.pxHandleConnected = NULL;
pxSocket->u.xTCP.pxHandleReceive = NULL;
pxSocket->u.xTCP.pxHandleSent = NULL;
}
}
#endif /* ( ( ipconfigUSE_TCP == 1 ) && ( ipconfigUSE_CALLBACKS == 1 ) ) */
/* Let the IP task close the socket to keep it synchronised with the
* packet handling. */
/* Note when changing the time-out value below, it must be checked who is calling
* this function. If it is called by the IP-task, a deadlock could occur.
* The IP-task would only call it in case of a user call-back */
if( xSendEventStructToIPTask( &xCloseEvent, ( TickType_t ) 0 ) == pdFAIL )
{
FreeRTOS_debug_printf( ( "FreeRTOS_closesocket: failed\n" ) );
xResult = -1;
}
else
{
xResult = 1;
}
}
return xResult;
}
/**
* @brief This is the internal version of FreeRTOS_closesocket(). It will
* be called by the IPtask only to avoid problems with synchronicity.
*
* @param[in] pxSocket: The socket descriptor of the socket being closed.
*
* @return Returns NULL, always.
*/
void * vSocketClose( FreeRTOS_Socket_t * pxSocket )
{
NetworkBufferDescriptor_t * pxNetworkBuffer;
#if ( ipconfigUSE_TCP == 1 )
{
/* For TCP: clean up a little more. */
if( pxSocket->ucProtocol == ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
#if ( ipconfigUSE_TCP_WIN == 1 )
{
if( pxSocket->u.xTCP.pxAckMessage != NULL )
{
vReleaseNetworkBufferAndDescriptor( pxSocket->u.xTCP.pxAckMessage );
}
/* Free the resources which were claimed by the tcpWin member */
vTCPWindowDestroy( &pxSocket->u.xTCP.xTCPWindow );
}
#endif /* ipconfigUSE_TCP_WIN */
/* Free the input and output streams */
if( pxSocket->u.xTCP.rxStream != NULL )
{
iptraceMEM_STATS_DELETE( pxSocket->u.xTCP.rxStream );
vPortFreeLarge( pxSocket->u.xTCP.rxStream );
}
if( pxSocket->u.xTCP.txStream != NULL )
{
iptraceMEM_STATS_DELETE( pxSocket->u.xTCP.txStream );
vPortFreeLarge( pxSocket->u.xTCP.txStream );
}
/* In case this is a child socket, make sure the child-count of the
* parent socket is decreased. */
prvTCPSetSocketCount( pxSocket );
}
}
#endif /* ipconfigUSE_TCP == 1 */
/* Socket must be unbound first, to ensure no more packets are queued on
* it. */
if( socketSOCKET_IS_BOUND( pxSocket ) )
{
/* If the network driver can iterate through 'xBoundUDPSocketsList',
* by calling xPortHasUDPSocket(), then the IP-task must temporarily
* suspend the scheduler to keep the list in a consistent state. */
#if ( ipconfigETHERNET_DRIVER_FILTERS_PACKETS == 1 )
{
vTaskSuspendAll();
}
#endif /* ipconfigETHERNET_DRIVER_FILTERS_PACKETS */
( void ) uxListRemove( &( pxSocket->xBoundSocketListItem ) );
#if ( ipconfigETHERNET_DRIVER_FILTERS_PACKETS == 1 )
{
( void ) xTaskResumeAll();
}
#endif /* ipconfigETHERNET_DRIVER_FILTERS_PACKETS */
}
/* Now the socket is not bound the list of waiting packets can be
* drained. */
if( pxSocket->ucProtocol == ( uint8_t ) FREERTOS_IPPROTO_UDP )
{
while( listCURRENT_LIST_LENGTH( &( pxSocket->u.xUDP.xWaitingPacketsList ) ) > 0U )
{
pxNetworkBuffer = ipCAST_PTR_TO_TYPE_PTR( NetworkBufferDescriptor_t, listGET_OWNER_OF_HEAD_ENTRY( &( pxSocket->u.xUDP.xWaitingPacketsList ) ) );
( void ) uxListRemove( &( pxNetworkBuffer->xBufferListItem ) );
vReleaseNetworkBufferAndDescriptor( pxNetworkBuffer );
}
}
if( pxSocket->xEventGroup != NULL )
{
vEventGroupDelete( pxSocket->xEventGroup );
}
#if ( ipconfigUSE_TCP == 1 ) && ( ipconfigHAS_DEBUG_PRINTF != 0 )
{
if( pxSocket->ucProtocol == ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
FreeRTOS_debug_printf( ( "FreeRTOS_closesocket[%u to %lxip:%u]: buffers %lu socks %lu\n",
pxSocket->usLocalPort,
pxSocket->u.xTCP.ulRemoteIP,
pxSocket->u.xTCP.usRemotePort,
uxGetNumberOfFreeNetworkBuffers(),
listCURRENT_LIST_LENGTH( &xBoundTCPSocketsList ) ) );
}
}
#endif /* ( ipconfigUSE_TCP == 1 ) && ( ipconfigHAS_DEBUG_PRINTF != 0 ) */
/* And finally, after all resources have been freed, free the socket space */
iptraceMEM_STATS_DELETE( pxSocket );
vPortFreeSocket( pxSocket );
return NULL;
} /* Tested */
/*-----------------------------------------------------------*/
#if ipconfigUSE_TCP == 1
/**
* @brief When a child socket gets closed, make sure to update the child-count of the
* parent. When a listening parent socket is closed, make sure no child-sockets
* keep a pointer to it.
*
* @param[in] pxSocketToDelete: The socket being closed.
*/
static void prvTCPSetSocketCount( FreeRTOS_Socket_t const * pxSocketToDelete )
{
const ListItem_t * pxIterator;
const ListItem_t * pxEnd = listGET_END_MARKER( &xBoundTCPSocketsList );
FreeRTOS_Socket_t * pxOtherSocket;
uint16_t usLocalPort = pxSocketToDelete->usLocalPort;
for( pxIterator = listGET_NEXT( pxEnd );
pxIterator != pxEnd;
pxIterator = listGET_NEXT( pxIterator ) )
{
pxOtherSocket = ipCAST_PTR_TO_TYPE_PTR( FreeRTOS_Socket_t, listGET_LIST_ITEM_OWNER( pxIterator ) );
if( ( pxOtherSocket->u.xTCP.ucTCPState == ( uint8_t ) eTCP_LISTEN ) &&
( pxOtherSocket->usLocalPort == usLocalPort ) &&
( pxOtherSocket->u.xTCP.usChildCount != 0U ) )
{
pxOtherSocket->u.xTCP.usChildCount--;
FreeRTOS_debug_printf( ( "Lost: Socket %u now has %u / %u child%s\n",
pxOtherSocket->usLocalPort,
pxOtherSocket->u.xTCP.usChildCount,
pxOtherSocket->u.xTCP.usBacklog,
( pxOtherSocket->u.xTCP.usChildCount == 1U ) ? "" : "ren" ) );
break;
}
}
}
#endif /* ipconfigUSE_TCP == 1 */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Set the value of receive/send buffer after some preliminary checks.
*
* @param[in] pxSocket: The socket whose options are being set.
* @param[in] lOptionName: The option name: either FREERTOS_SO_SNDBUF or
* FREERTOS_SO_SNDBUF.
* @param[in] pvOptionValue: The value of the option being set.
*
* @return If there is no error, then 0 is returned. Or a negative errno
* value is returned.
*/
static BaseType_t prvSockopt_so_buffer( FreeRTOS_Socket_t * pxSocket,
int32_t lOptionName,
const void * pvOptionValue )
{
uint32_t ulNewValue;
BaseType_t xReturn;
if( pxSocket->ucProtocol != ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
FreeRTOS_debug_printf( ( "Set SO_%sBUF: wrong socket type\n",
( lOptionName == FREERTOS_SO_SNDBUF ) ? "SND" : "RCV" ) );
xReturn = -pdFREERTOS_ERRNO_EINVAL;
}
else if( ( ( lOptionName == FREERTOS_SO_SNDBUF ) && ( pxSocket->u.xTCP.txStream != NULL ) ) ||
( ( lOptionName == FREERTOS_SO_RCVBUF ) && ( pxSocket->u.xTCP.rxStream != NULL ) ) )
{
FreeRTOS_debug_printf( ( "Set SO_%sBUF: buffer already created\n",
( lOptionName == FREERTOS_SO_SNDBUF ) ? "SND" : "RCV" ) );
xReturn = -pdFREERTOS_ERRNO_EINVAL;
}
else
{
ulNewValue = *( ipPOINTER_CAST( const uint32_t *, pvOptionValue ) );
if( lOptionName == FREERTOS_SO_SNDBUF )
{
/* Round up to nearest MSS size */
ulNewValue = FreeRTOS_round_up( ulNewValue, ( uint32_t ) pxSocket->u.xTCP.usInitMSS );
pxSocket->u.xTCP.uxTxStreamSize = ulNewValue;
}
else
{
pxSocket->u.xTCP.uxRxStreamSize = ulNewValue;
}
xReturn = 0;
}
return xReturn;
}
#endif /* ipconfigUSE_TCP == 1 */
/*-----------------------------------------------------------*/
/* FreeRTOS_setsockopt calls itself, but in a very limited way,
* only when FREERTOS_SO_WIN_PROPERTIES is being set. */
/**
* @brief Set the socket options for the given socket.
*
* @param[in] xSocket: The socket for which the options are to be set.
* @param[in] lLevel: Not used. Parameter is used to maintain the Berkeley sockets
* standard.
* @param[in] lOptionName: The name of the option to be set.
* @param[in] pvOptionValue: The value of the option to be set.
* @param[in] uxOptionLength: Not used. Parameter is used to maintain the Berkeley
* sockets standard.
*
* @return If the option can be set with the given value, then 0 is returned. Else,
* an error code is returned.
*/
BaseType_t FreeRTOS_setsockopt( Socket_t xSocket,
int32_t lLevel,
int32_t lOptionName,
const void * pvOptionValue,
size_t uxOptionLength )
{
/* The standard Berkeley function returns 0 for success. */
BaseType_t xReturn = -pdFREERTOS_ERRNO_EINVAL;
FreeRTOS_Socket_t * pxSocket;
pxSocket = ( FreeRTOS_Socket_t * ) xSocket;
/* The function prototype is designed to maintain the expected Berkeley
* sockets standard, but this implementation does not use all the parameters. */
( void ) lLevel;
( void ) uxOptionLength;
if( ( pxSocket == NULL ) || ( pxSocket == FREERTOS_INVALID_SOCKET ) )
{
xReturn = -pdFREERTOS_ERRNO_EINVAL;
return xReturn;
}
switch( lOptionName )
{
case FREERTOS_SO_RCVTIMEO:
/* Receive time out. */
pxSocket->xReceiveBlockTime = *( ( const TickType_t * ) pvOptionValue );
xReturn = 0;
break;
case FREERTOS_SO_SNDTIMEO:
pxSocket->xSendBlockTime = *( ( const TickType_t * ) pvOptionValue );
if( pxSocket->ucProtocol == ( uint8_t ) FREERTOS_IPPROTO_UDP )
{
/* The send time out is capped for the reason stated in the
* comments where ipconfigUDP_MAX_SEND_BLOCK_TIME_TICKS is defined
* in FreeRTOSIPConfig.h (assuming an official configuration file
* is being used. */
if( pxSocket->xSendBlockTime > ipconfigUDP_MAX_SEND_BLOCK_TIME_TICKS )
{
pxSocket->xSendBlockTime = ipconfigUDP_MAX_SEND_BLOCK_TIME_TICKS;
}
}
else
{
/* For TCP socket, it isn't necessary to limit the blocking time
* because the FreeRTOS_send() function does not wait for a network
* buffer to become available. */
}
xReturn = 0;
break;
#if ( ipconfigUDP_MAX_RX_PACKETS > 0U )
case FREERTOS_SO_UDP_MAX_RX_PACKETS:
if( pxSocket->ucProtocol != ( uint8_t ) FREERTOS_IPPROTO_UDP )
{
break; /* will return -pdFREERTOS_ERRNO_EINVAL */
}
pxSocket->u.xUDP.uxMaxPackets = *( ( const UBaseType_t * ) pvOptionValue );
xReturn = 0;
break;
#endif /* ipconfigUDP_MAX_RX_PACKETS */
case FREERTOS_SO_UDPCKSUM_OUT:
/* Turn calculating of the UDP checksum on/off for this socket. If pvOptionValue
* is anything else than NULL, the checksum generation will be turned on. */
if( pvOptionValue == NULL )
{
pxSocket->ucSocketOptions &= ~( ( uint8_t ) FREERTOS_SO_UDPCKSUM_OUT );
}
else
{
pxSocket->ucSocketOptions |= ( uint8_t ) FREERTOS_SO_UDPCKSUM_OUT;
}
xReturn = 0;
break;
#if ( ipconfigUSE_CALLBACKS == 1 )
#if ( ipconfigUSE_TCP == 1 )
case FREERTOS_SO_TCP_CONN_HANDLER: /* Set a callback for (dis)connection events */
case FREERTOS_SO_TCP_RECV_HANDLER: /* Install a callback for receiving TCP data. Supply pointer to 'F_TCP_UDP_Handler_t' (see below) */
case FREERTOS_SO_TCP_SENT_HANDLER: /* Install a callback for sending TCP data. Supply pointer to 'F_TCP_UDP_Handler_t' (see below) */
#endif /* ipconfigUSE_TCP */
case FREERTOS_SO_UDP_RECV_HANDLER: /* Install a callback for receiving UDP data. Supply pointer to 'F_TCP_UDP_Handler_t' (see below) */
case FREERTOS_SO_UDP_SENT_HANDLER: /* Install a callback for sending UDP data. Supply pointer to 'F_TCP_UDP_Handler_t' (see below) */
{
#if ( ipconfigUSE_TCP == 1 )
{
UBaseType_t uxProtocol;
if( ( lOptionName == FREERTOS_SO_UDP_RECV_HANDLER ) ||
( lOptionName == FREERTOS_SO_UDP_SENT_HANDLER ) )
{
uxProtocol = ( UBaseType_t ) FREERTOS_IPPROTO_UDP;
}
else
{
uxProtocol = ( UBaseType_t ) FREERTOS_IPPROTO_TCP;
}
if( pxSocket->ucProtocol != ( uint8_t ) uxProtocol )
{
break; /* will return -pdFREERTOS_ERRNO_EINVAL */
}
}
#else /* if ( ipconfigUSE_TCP == 1 ) */
{
/* No need to check if the socket has the right
* protocol, because only UDP socket can be created. */
}
#endif /* ipconfigUSE_TCP */
switch( lOptionName )
{
#if ipconfigUSE_TCP == 1
case FREERTOS_SO_TCP_CONN_HANDLER:
pxSocket->u.xTCP.pxHandleConnected = ipCAST_CONST_PTR_TO_CONST_TYPE_PTR( F_TCP_UDP_Handler_t, pvOptionValue )->pxOnTCPConnected;
break;
case FREERTOS_SO_TCP_RECV_HANDLER:
pxSocket->u.xTCP.pxHandleReceive = ipCAST_CONST_PTR_TO_CONST_TYPE_PTR( F_TCP_UDP_Handler_t, pvOptionValue )->pxOnTCPReceive;
break;
case FREERTOS_SO_TCP_SENT_HANDLER:
pxSocket->u.xTCP.pxHandleSent = ipCAST_CONST_PTR_TO_CONST_TYPE_PTR( F_TCP_UDP_Handler_t, pvOptionValue )->pxOnTCPSent;
break;
#endif /* ipconfigUSE_TCP */
case FREERTOS_SO_UDP_RECV_HANDLER:
pxSocket->u.xUDP.pxHandleReceive = ipCAST_CONST_PTR_TO_CONST_TYPE_PTR( F_TCP_UDP_Handler_t, pvOptionValue )->pxOnUDPReceive;
break;
case FREERTOS_SO_UDP_SENT_HANDLER:
pxSocket->u.xUDP.pxHandleSent = ipCAST_CONST_PTR_TO_CONST_TYPE_PTR( F_TCP_UDP_Handler_t, pvOptionValue )->pxOnUDPSent;
break;
default:
/* Should it throw an error here? */
break;
}
}
xReturn = 0;
break;
#endif /* ipconfigUSE_CALLBACKS */
#if ( ipconfigUSE_TCP != 0 )
#if ( ipconfigSOCKET_HAS_USER_SEMAPHORE != 0 )
/* Each socket has a semaphore on which the using task normally
* sleeps. */
case FREERTOS_SO_SET_SEMAPHORE:
{
pxSocket->pxUserSemaphore = *( ipPOINTER_CAST( SemaphoreHandle_t *, pvOptionValue ) );
}
xReturn = 0;
break;
#endif /* ipconfigSOCKET_HAS_USER_SEMAPHORE */
#if ( ipconfigSOCKET_HAS_USER_WAKE_CALLBACK != 0 )
case FREERTOS_SO_WAKEUP_CALLBACK:
/* Each socket can have a callback function that is executed
* when there is an event the socket's owner might want to
* process. */
/* The type cast of the pointer expression "A" to type "B" removes const qualifier from the pointed to type. */
pxSocket->pxUserWakeCallback = ( const SocketWakeupCallback_t ) pvOptionValue;
xReturn = 0;
break;
#endif /* ipconfigSOCKET_HAS_USER_WAKE_CALLBACK */
case FREERTOS_SO_SET_LOW_HIGH_WATER:
{
const LowHighWater_t * pxLowHighWater = ipPOINTER_CAST( const LowHighWater_t *, pvOptionValue );
if( pxSocket->ucProtocol != ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
/* It is not allowed to access 'pxSocket->u.xTCP'. */
FreeRTOS_debug_printf( ( "FREERTOS_SO_SET_LOW_HIGH_WATER: wrong socket type\n" ) );
break; /* will return -pdFREERTOS_ERRNO_EINVAL */
}
if( ( pxLowHighWater->uxLittleSpace >= pxLowHighWater->uxEnoughSpace ) ||
( pxLowHighWater->uxEnoughSpace > pxSocket->u.xTCP.uxRxStreamSize ) )
{
/* Impossible values. */
FreeRTOS_debug_printf( ( "FREERTOS_SO_SET_LOW_HIGH_WATER: bad values\n" ) );
break; /* will return -pdFREERTOS_ERRNO_EINVAL */
}
/* Send a STOP when buffer space drops below 'uxLittleSpace' bytes. */
pxSocket->u.xTCP.uxLittleSpace = pxLowHighWater->uxLittleSpace;
/* Send a GO when buffer space grows above 'uxEnoughSpace' bytes. */
pxSocket->u.xTCP.uxEnoughSpace = pxLowHighWater->uxEnoughSpace;
xReturn = 0;
}
break;
case FREERTOS_SO_SNDBUF: /* Set the size of the send buffer, in units of MSS (TCP only) */
case FREERTOS_SO_RCVBUF: /* Set the size of the receive buffer, in units of MSS (TCP only) */
xReturn = prvSockopt_so_buffer( pxSocket, lOptionName, pvOptionValue );
break;
case FREERTOS_SO_WIN_PROPERTIES: /* Set all buffer and window properties in one call, parameter is pointer to WinProperties_t */
{
const WinProperties_t * pxProps;
if( pxSocket->ucProtocol != ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
FreeRTOS_debug_printf( ( "Set SO_WIN_PROP: wrong socket type\n" ) );
break; /* will return -pdFREERTOS_ERRNO_EINVAL */
}
if( ( pxSocket->u.xTCP.txStream != NULL ) || ( pxSocket->u.xTCP.rxStream != NULL ) )
{
FreeRTOS_debug_printf( ( "Set SO_WIN_PROP: buffer already created\n" ) );
break; /* will return -pdFREERTOS_ERRNO_EINVAL */
}
pxProps = ipPOINTER_CAST( const WinProperties_t *, pvOptionValue );
xReturn = prvSockopt_so_buffer( pxSocket, FREERTOS_SO_SNDBUF, &( pxProps->lTxBufSize ) );
if( xReturn != 0 )
{
break; /* will return an error. */
}
xReturn = prvSockopt_so_buffer( pxSocket, FREERTOS_SO_RCVBUF, &( pxProps->lRxBufSize ) );
if( xReturn != 0 )
{
break; /* will return an error. */
}
#if ( ipconfigUSE_TCP_WIN == 1 )
{
pxSocket->u.xTCP.uxRxWinSize = ( uint32_t ) pxProps->lRxWinSize; /* Fixed value: size of the TCP reception window */
pxSocket->u.xTCP.uxTxWinSize = ( uint32_t ) pxProps->lTxWinSize; /* Fixed value: size of the TCP transmit window */
}
#else
{
pxSocket->u.xTCP.uxRxWinSize = 1U;
pxSocket->u.xTCP.uxTxWinSize = 1U;
}
#endif
/* In case the socket has already initialised its tcpWin,
* adapt the window size parameters */
if( pxSocket->u.xTCP.xTCPWindow.u.bits.bHasInit != pdFALSE_UNSIGNED )
{
pxSocket->u.xTCP.xTCPWindow.xSize.ulRxWindowLength = pxSocket->u.xTCP.uxRxWinSize * pxSocket->u.xTCP.usInitMSS;
pxSocket->u.xTCP.xTCPWindow.xSize.ulTxWindowLength = pxSocket->u.xTCP.uxTxWinSize * pxSocket->u.xTCP.usInitMSS;
}
}
xReturn = 0;
break;
case FREERTOS_SO_REUSE_LISTEN_SOCKET: /* If true, the server-socket will turn into a connected socket */
{
if( pxSocket->ucProtocol != ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
break; /* will return -pdFREERTOS_ERRNO_EINVAL */
}
if( *( ( const BaseType_t * ) pvOptionValue ) != 0 )
{
pxSocket->u.xTCP.bits.bReuseSocket = pdTRUE;
}
else
{
pxSocket->u.xTCP.bits.bReuseSocket = pdFALSE;
}
}
xReturn = 0;
break;
case FREERTOS_SO_CLOSE_AFTER_SEND: /* As soon as the last byte has been transmitted, finalise the connection */
{
if( pxSocket->ucProtocol != ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
break; /* will return -pdFREERTOS_ERRNO_EINVAL */
}
if( *( ( const BaseType_t * ) pvOptionValue ) != 0 )
{
pxSocket->u.xTCP.bits.bCloseAfterSend = pdTRUE;
}
else
{
pxSocket->u.xTCP.bits.bCloseAfterSend = pdFALSE;
}
}
xReturn = 0;
break;
case FREERTOS_SO_SET_FULL_SIZE: /* Refuse to send packets smaller than MSS */
{
if( pxSocket->ucProtocol != ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
break; /* will return -pdFREERTOS_ERRNO_EINVAL */
}
if( *( ( const BaseType_t * ) pvOptionValue ) != 0 )
{
pxSocket->u.xTCP.xTCPWindow.u.bits.bSendFullSize = pdTRUE;
}
else
{
pxSocket->u.xTCP.xTCPWindow.u.bits.bSendFullSize = pdFALSE;
}
if( ( pxSocket->u.xTCP.xTCPWindow.u.bits.bSendFullSize == pdFALSE_UNSIGNED ) &&
( pxSocket->u.xTCP.ucTCPState >= ( uint8_t ) eESTABLISHED ) &&
( FreeRTOS_outstanding( pxSocket ) != 0 ) )
{
pxSocket->u.xTCP.usTimeout = 1U; /* to set/clear bSendFullSize */
( void ) xSendEventToIPTask( eTCPTimerEvent );
}
}
xReturn = 0;
break;
case FREERTOS_SO_STOP_RX: /* Refuse to receive more packets. */
{
if( pxSocket->ucProtocol != ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
break; /* will return -pdFREERTOS_ERRNO_EINVAL */
}
if( *( ( const BaseType_t * ) pvOptionValue ) != 0 )
{
pxSocket->u.xTCP.bits.bRxStopped = pdTRUE;
}
else
{
pxSocket->u.xTCP.bits.bRxStopped = pdFALSE;
}
pxSocket->u.xTCP.bits.bWinChange = pdTRUE;
pxSocket->u.xTCP.usTimeout = 1U; /* to set/clear bRxStopped */
( void ) xSendEventToIPTask( eTCPTimerEvent );
}
xReturn = 0;
break;
#endif /* ipconfigUSE_TCP == 1 */
default:
/* No other options are handled. */
xReturn = -pdFREERTOS_ERRNO_ENOPROTOOPT;
break;
}
return xReturn;
} /* Tested */
/*-----------------------------------------------------------*/
/**
* @brief Find an available port number per https://tools.ietf.org/html/rfc6056.
*
* @param[in] xProtocol: FREERTOS_IPPROTO_TCP/FREERTOS_IPPROTO_UDP.
*
* @return If an available protocol port is found then that port number is returned.
* Or else, 0 is returned.
*/
static uint16_t prvGetPrivatePortNumber( BaseType_t xProtocol )
{
const uint16_t usEphemeralPortCount =
socketAUTO_PORT_ALLOCATION_MAX_NUMBER - ( socketAUTO_PORT_ALLOCATION_START_NUMBER - 1U );
uint16_t usIterations = usEphemeralPortCount;
uint32_t ulRandomSeed = 0;
uint16_t usResult = 0;
const List_t * pxList;
#if ipconfigUSE_TCP == 1
if( xProtocol == ( BaseType_t ) FREERTOS_IPPROTO_TCP )
{
pxList = &xBoundTCPSocketsList;
}
else
#endif
{
pxList = &xBoundUDPSocketsList;
}
/* Avoid compiler warnings if ipconfigUSE_TCP is not defined. */
( void ) xProtocol;
/* Find the next available port using the random seed as a starting
* point. */
do
{
/* Only proceed if the random number generator succeeded. */
if( xApplicationGetRandomNumber( &( ulRandomSeed ) ) == pdFALSE )
{
break;
}
/* Map the random to a candidate port. */
usResult =
socketAUTO_PORT_ALLOCATION_START_NUMBER +
( ( ( uint16_t ) ulRandomSeed ) % usEphemeralPortCount );
/* Check if there's already an open socket with the same protocol
* and port. */
if( NULL == pxListFindListItemWithValue(
pxList,
( TickType_t ) FreeRTOS_htons( usResult ) ) )
{
usResult = FreeRTOS_htons( usResult );
break;
}
else
{
usResult = 0;
}
usIterations--;
}
while( usIterations > 0U );
return usResult;
}
/*-----------------------------------------------------------*/
/**
* @brief Find a list item associated with the wanted-item.
*
* @param[in] pxList: The list through which the search is to be conducted.
* @param[in] xWantedItemValue: The wanted item whose association is to be found.
*
* @return The list item holding the value being searched for. If nothing is found,
* then a NULL is returned.
*/
static const ListItem_t * pxListFindListItemWithValue( const List_t * pxList,
TickType_t xWantedItemValue )
{
const ListItem_t * pxResult = NULL;
if( ( xIPIsNetworkTaskReady() != pdFALSE ) && ( pxList != NULL ) )
{
const ListItem_t * pxIterator;
const ListItem_t * pxEnd = listGET_END_MARKER( pxList );
for( pxIterator = listGET_NEXT( pxEnd );
pxIterator != pxEnd;
pxIterator = listGET_NEXT( pxIterator ) )
{
if( listGET_LIST_ITEM_VALUE( pxIterator ) == xWantedItemValue )
{
pxResult = pxIterator;
break;
}
}
}
return pxResult;
} /* Tested */
/*-----------------------------------------------------------*/
/**
* @brief Find the UDP socket corresponding to the port number.
*
* @param[in] uxLocalPort: The port whose corresponding bound UDP socket
* is to be found.
*
* @return The socket owning the port if found or else NULL.
*/
FreeRTOS_Socket_t * pxUDPSocketLookup( UBaseType_t uxLocalPort )
{
const ListItem_t * pxListItem;
FreeRTOS_Socket_t * pxSocket = NULL;
/* Looking up a socket is quite simple, find a match with the local port.
*
* See if there is a list item associated with the port number on the
* list of bound sockets. */
pxListItem = pxListFindListItemWithValue( &xBoundUDPSocketsList, ( TickType_t ) uxLocalPort );
if( pxListItem != NULL )
{
/* The owner of the list item is the socket itself. */
pxSocket = ipCAST_PTR_TO_TYPE_PTR( FreeRTOS_Socket_t, listGET_LIST_ITEM_OWNER( pxListItem ) );
configASSERT( pxSocket != NULL );
}
return pxSocket;
}
/*-----------------------------------------------------------*/
#define sockDIGIT_COUNT ( 3U ) /**< Each nibble is expressed in at most 3 digits such as "192". */
/**
* @brief Convert the 32-bit representation of the IP-address to the dotted decimal
* notation after some checks.
* A safe alternative is FreeRTOS_inet_ntop4().
*
* @param[in] ulIPAddress: 32-bit representation of the IP-address.
* @param[out] pcBuffer: The buffer where the dotted decimal representation will be
* stored if all checks pass. The buffer must be at least 16
* bytes long.
*
* @return If all checks pass, then the pointer returned will be same as pcBuffer
* and will have the address stored in the location. Else, NULL is returned.
*/
const char * FreeRTOS_inet_ntoa( uint32_t ulIPAddress,
char * pcBuffer )
{
socklen_t uxNibble;
socklen_t uxIndex = 0;
const uint8_t * pucAddress = ( const uint8_t * ) &( ulIPAddress );
const char * pcResult = pcBuffer;
const socklen_t uxSize = 16;
for( uxNibble = 0; uxNibble < ipSIZE_OF_IPv4_ADDRESS; uxNibble++ )
{
uint8_t pucDigits[ sockDIGIT_COUNT ];
uint8_t ucValue = pucAddress[ uxNibble ];
socklen_t uxSource = ( socklen_t ) sockDIGIT_COUNT - ( socklen_t ) 1U;
socklen_t uxNeeded;
for( ; ; )
{
pucDigits[ uxSource ] = ucValue % ( uint8_t ) 10U;
ucValue /= ( uint8_t ) 10U;
if( uxSource == 1U )
{
break;
}
uxSource--;
}
pucDigits[ 0 ] = ucValue;
/* Skip leading zeros. */
for( uxSource = 0; uxSource < ( ( socklen_t ) sockDIGIT_COUNT - ( socklen_t ) 1U ); uxSource++ )
{
if( pucDigits[ uxSource ] != 0U )
{
break;
}
}
/* Write e.g. "192.", which is 3 digits and a dot. */
uxNeeded = ( ( socklen_t ) sockDIGIT_COUNT - uxSource ) + 1U;
if( ( uxIndex + uxNeeded ) > uxSize )
{
/* The result won't fit. */
pcResult = NULL;
break;
}
for( ; uxSource < ( socklen_t ) sockDIGIT_COUNT; uxSource++ )
{
pcBuffer[ uxIndex ] = ( char ) ( pucDigits[ uxSource ] + ( char ) '0' );
uxIndex++;
}
if( uxNibble < ( ipSIZE_OF_IPv4_ADDRESS - 1U ) )
{
pcBuffer[ uxIndex ] = '.';
}
else
{
pcBuffer[ uxIndex ] = '\0';
}
uxIndex++;
}
return pcResult;
}
/*-----------------------------------------------------------*/
/**
* @brief Convert the dotted decimal format of the IP-address to the 32-bit representation.
*
* @param[in] xAddressFamily: The Address family to which the IP-address belongs to. Only
* FREERTOS_AF_INET (IPv4) is supported.
* @param[in] pcSource: Pointer to the string holding the dotted decimal representation of
* the IP-address.
* @param[out] pvDestination: The pointer to the address struct/variable where the converted
* IP-address will be stored. The buffer must be 4 bytes long
* in case of a IPv4 address.
*
* @return If all checks pass, then pdPASS is returned or else pdFAIL is returned.
*/
BaseType_t FreeRTOS_inet_pton( BaseType_t xAddressFamily,
const char * pcSource,
void * pvDestination )
{
BaseType_t xResult;
/* Printable string to struct sockaddr. */
switch( xAddressFamily )
{
case FREERTOS_AF_INET:
xResult = FreeRTOS_inet_pton4( pcSource, pvDestination );
break;
default:
xResult = -pdFREERTOS_ERRNO_EAFNOSUPPORT;
break;
}
return xResult;
}
/*-----------------------------------------------------------*/
/**
* @brief Convert the 32-bit representation of the IP-address to the dotted
* decimal format based on the Address Family. (Only FREERTOS_AF_INET
* is allowed).
*
* @param[in] xAddressFamily: The address family of the IP-address.
* @param[in] pvSource: Pointer to the 32-bit representation of IP-address.
* @param[out] pcDestination: The pointer to the character array where the dotted
* decimal address will be stored if every check does pass.
* @param[in] uxSize: Size of the character array. This value makes sure that the code
* doesn't write beyond it's bounds.
*
* @return If every check does pass, then the pointer to the pcDestination is returned
* holding the dotted decimal format of IP-address. Else, a NULL is returned.
*/
const char * FreeRTOS_inet_ntop( BaseType_t xAddressFamily,
const void * pvSource,
char * pcDestination,
socklen_t uxSize )
{
const char * pcResult;
/* Printable struct sockaddr to string. */
switch( xAddressFamily )
{
case FREERTOS_AF_INET:
pcResult = FreeRTOS_inet_ntop4( pvSource, pcDestination, uxSize );
break;
default:
/* errno should be set to pdFREERTOS_ERRNO_EAFNOSUPPORT. */
pcResult = NULL;
break;
}
return pcResult;
}
/*-----------------------------------------------------------*/
/**
* @brief Convert the 32-bit representation of the IP-address to the dotted decimal format.
*
* @param[in] pvSource: The pointer to the 32-bit representation of the IP-address.
* @param[out] pcDestination: The pointer to a character array where the string of the
* dotted decimal IP format.
* @param[in] uxSize: Size of the character array. This value makes sure that the code
* doesn't write beyond it's bounds.
*
* @return The pointer to the string holding the dotted decimal format of the IP-address. If
* everything passes correctly, then the pointer being returned is the same as
* pcDestination, else a NULL is returned.
*/
const char * FreeRTOS_inet_ntop4( const void * pvSource,
char * pcDestination,
socklen_t uxSize )
{
uint32_t ulIPAddress;
void * pvCopyDest;
const char * pcReturn;
if( uxSize < 16U )
{
/* There must be space for "255.255.255.255". */
pcReturn = NULL;
}
else
{
pvCopyDest = ( void * ) &ulIPAddress;
( void ) memcpy( pvCopyDest, pvSource, sizeof( ulIPAddress ) );
( void ) FreeRTOS_inet_ntoa( ulIPAddress, pcDestination );
pcReturn = pcDestination;
}
return pcReturn;
}
/*-----------------------------------------------------------*/
/**
* @brief This function converts the character string pcSource into a network address
* structure, then copies the network address structure to pvDestination.
* pvDestination is written in network byte order.
*
* @param[in] pcSource: The character string in holding the IP address.
* @param[out] pvDestination: The returned network address in 32-bit network-endian format.
*
* @return pdPASS if the translation was successful or else pdFAIL.
*/
BaseType_t FreeRTOS_inet_pton4( const char * pcSource,
void * pvDestination )
{
const uint32_t ulDecimalBase = 10U;
uint8_t ucOctet[ socketMAX_IP_ADDRESS_OCTETS ];
uint32_t ulReturn = 0UL, ulValue;
UBaseType_t uxOctetNumber;
BaseType_t xResult = pdPASS;
const char * pcIPAddress = pcSource;
const void * pvCopySource;
/* Translate "192.168.2.100" to a 32-bit number, network-endian. */
for( uxOctetNumber = 0U; uxOctetNumber < socketMAX_IP_ADDRESS_OCTETS; uxOctetNumber++ )
{
ulValue = 0UL;
while( ( *pcIPAddress >= '0' ) && ( *pcIPAddress <= '9' ) )
{
BaseType_t xChar;
/* Move previous read characters into the next decimal
* position. */
ulValue *= ulDecimalBase;
/* Add the binary value of the ascii character. */
xChar = ( BaseType_t ) pcIPAddress[ 0 ];
xChar = xChar - ( BaseType_t ) '0';
ulValue += ( uint32_t ) xChar;
/* Move to next character in the string. */
pcIPAddress++;
}
/* Check characters were read. */
if( pcIPAddress == pcSource )
{
xResult = pdFAIL;
}
/* Check the value fits in an 8-bit number. */
if( ulValue > 0xffUL )
{
xResult = pdFAIL;
}
else
{
ucOctet[ uxOctetNumber ] = ( uint8_t ) ulValue;
/* Check the next character is as expected. */
if( uxOctetNumber < ( socketMAX_IP_ADDRESS_OCTETS - 1U ) )
{
if( *pcIPAddress != '.' )
{
xResult = pdFAIL;
}
else
{
/* Move past the dot. */
pcIPAddress++;
}
}
}
if( xResult == pdFAIL )
{
/* No point going on. */
break;
}
}
if( *pcIPAddress != ( char ) 0 )
{
/* Expected the end of the string. */
xResult = pdFAIL;
}
if( uxOctetNumber != socketMAX_IP_ADDRESS_OCTETS )
{
/* Didn't read enough octets. */
xResult = pdFAIL;
}
if( xResult == pdPASS )
{
/* lint: ucOctet has been set because xResult == pdPASS. */
ulReturn = FreeRTOS_inet_addr_quick( ucOctet[ 0 ], ucOctet[ 1 ], ucOctet[ 2 ], ucOctet[ 3 ] );
}
else
{
ulReturn = 0UL;
}
pvCopySource = ( const void * ) &ulReturn;
( void ) memcpy( pvDestination, pvCopySource, sizeof( ulReturn ) );
return xResult;
}
/*-----------------------------------------------------------*/
/**
* @brief Convert the IP address from "w.x.y.z" (dotted decimal) format to the 32-bit format.
*
* @param[in] pcIPAddress: The character string pointer holding the IP-address in the "W.X.Y.Z"
* (dotted decimal) format.
*
* @return The 32-bit representation of IP(v4) address.
*/
uint32_t FreeRTOS_inet_addr( const char * pcIPAddress )
{
uint32_t ulReturn = 0UL;
/* inet_pton AF_INET target is a 4-byte 'struct in_addr'. */
( void ) FreeRTOS_inet_pton4( pcIPAddress, &( ulReturn ) );
return ulReturn;
}
/*-----------------------------------------------------------*/
/**
* @brief Function to get the local address and IP port of the given socket.
*
* @param[in] xSocket: Socket whose port is to be added to the pxAddress.
* @param[out] pxAddress: Structure in which the IP address and the port number
* is returned.
*
* @return Size of the freertos_sockaddr structure.
*/
size_t FreeRTOS_GetLocalAddress( ConstSocket_t xSocket,
struct freertos_sockaddr * pxAddress )
{
const FreeRTOS_Socket_t * pxSocket = ( const FreeRTOS_Socket_t * ) xSocket;
/* IP address of local machine. */
pxAddress->sin_addr = *ipLOCAL_IP_ADDRESS_POINTER;
/* Local port on this machine. */
pxAddress->sin_port = FreeRTOS_htons( pxSocket->usLocalPort );
return sizeof( *pxAddress );
}
/*-----------------------------------------------------------*/
/**
* @brief Wake up the user of the given socket through event-groups.
*
* @param[in] pxSocket: The socket whose user is to be woken up.
*/
void vSocketWakeUpUser( FreeRTOS_Socket_t * pxSocket )
{
/* _HT_ must work this out, now vSocketWakeUpUser will be called for any important
* event or transition */
#if ( ipconfigSOCKET_HAS_USER_SEMAPHORE == 1 )
{
if( pxSocket->pxUserSemaphore != NULL )
{
( void ) xSemaphoreGive( pxSocket->pxUserSemaphore );
}
}
#endif /* ipconfigSOCKET_HAS_USER_SEMAPHORE */
#if ( ipconfigSOCKET_HAS_USER_WAKE_CALLBACK == 1 )
{
if( pxSocket->pxUserWakeCallback != NULL )
{
pxSocket->pxUserWakeCallback( pxSocket );
}
}
#endif /* ipconfigSOCKET_HAS_USER_WAKE_CALLBACK */
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
{
if( pxSocket->pxSocketSet != NULL )
{
EventBits_t xSelectBits = ( pxSocket->xEventBits >> SOCKET_EVENT_BIT_COUNT ) & ( ( EventBits_t ) eSELECT_ALL );
if( xSelectBits != 0UL )
{
pxSocket->xSocketBits |= xSelectBits;
( void ) xEventGroupSetBits( pxSocket->pxSocketSet->xSelectGroup, xSelectBits );
}
}
pxSocket->xEventBits &= ( EventBits_t ) eSOCKET_ALL;
}
#endif /* ipconfigSUPPORT_SELECT_FUNCTION */
if( ( pxSocket->xEventGroup != NULL ) && ( pxSocket->xEventBits != 0U ) )
{
( void ) xEventGroupSetBits( pxSocket->xEventGroup, pxSocket->xEventBits );
}
pxSocket->xEventBits = 0UL;
}
/*-----------------------------------------------------------*/
#if ( ipconfigETHERNET_DRIVER_FILTERS_PACKETS == 1 )
/**
* @brief This define makes it possible for network interfaces to inspect
* UDP messages and see if there is any UDP socket bound to a given port
* number. This is probably only useful in systems with a minimum of
* RAM and when lots of anonymous broadcast messages come in.
*
* @param[in] usPortNr: the port number to look for.
*
* @return xFound if a socket with the port number is found.
*/
BaseType_t xPortHasUDPSocket( uint16_t usPortNr )
{
BaseType_t xFound = pdFALSE;
vTaskSuspendAll();
{
if( ( pxListFindListItemWithValue( &xBoundUDPSocketsList, ( TickType_t ) usPortNr ) != NULL ) )
{
xFound = pdTRUE;
}
}
( void ) xTaskResumeAll();
return xFound;
}
#endif /* ipconfigETHERNET_DRIVER_FILTERS_PACKETS */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Check if it makes any sense to wait for a connect event.
*
* @param[in] pxSocket: The socket trying to connect.
*
* @return It may return: -EINPROGRESS, -EAGAIN, or 0 for OK.
*/
static BaseType_t bMayConnect( FreeRTOS_Socket_t const * pxSocket )
{
BaseType_t xResult;
eIPTCPState_t eState = ipNUMERIC_CAST( eIPTCPState_t, pxSocket->u.xTCP.ucTCPState );
switch( eState )
{
case eCLOSED:
case eCLOSE_WAIT:
xResult = 0;
break;
case eCONNECT_SYN:
xResult = -pdFREERTOS_ERRNO_EINPROGRESS;
break;
case eTCP_LISTEN:
case eSYN_FIRST:
case eSYN_RECEIVED:
case eESTABLISHED:
case eFIN_WAIT_1:
case eFIN_WAIT_2:
case eCLOSING:
case eLAST_ACK:
case eTIME_WAIT:
default:
xResult = -pdFREERTOS_ERRNO_EAGAIN;
break;
}
return xResult;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Called from #FreeRTOS_connect(): make some checks and if allowed,
* send a message to the IP-task to start connecting to a remote socket.
*
* @param[in] pxSocket: The socket attempting to connect to a remote port.
* @param[in] pxAddress: The address the socket is trying to connect to.
*
* @return 0 on successful checks or a negative error code.
*/
static BaseType_t prvTCPConnectStart( FreeRTOS_Socket_t * pxSocket,
struct freertos_sockaddr const * pxAddress )
{
BaseType_t xResult = 0;
if( pxAddress == NULL )
{
/* NULL address passed to the function. Invalid value. */
xResult = -pdFREERTOS_ERRNO_EINVAL;
}
else if( prvValidSocket( pxSocket, FREERTOS_IPPROTO_TCP, pdFALSE ) == pdFALSE )
{
/* Not a valid socket or wrong type */
xResult = -pdFREERTOS_ERRNO_EBADF;
}
else if( FreeRTOS_issocketconnected( pxSocket ) > 0 )
{
/* The socket is already connected. */
xResult = -pdFREERTOS_ERRNO_EISCONN;
}
else if( !socketSOCKET_IS_BOUND( pxSocket ) )
{
/* Bind the socket to the port that the client task will send from.
* Non-standard, so the error returned is that returned by bind(). */
xResult = FreeRTOS_bind( pxSocket, NULL, 0U );
}
else
{
/* The socket is valid, not yet connected, and already bound to a port number. */
}
if( xResult == 0 )
{
/* Check if it makes any sense to wait for a connect event, this condition
* might change while sleeping, so it must be checked within each loop */
xResult = bMayConnect( pxSocket ); /* -EINPROGRESS, -EAGAIN, or 0 for OK */
/* Start the connect procedure, kernel will start working on it */
if( xResult == 0 )
{
pxSocket->u.xTCP.bits.bConnPrepared = pdFALSE;
pxSocket->u.xTCP.ucRepCount = 0U;
FreeRTOS_debug_printf( ( "FreeRTOS_connect: %u to %lxip:%u\n",
pxSocket->usLocalPort, FreeRTOS_ntohl( pxAddress->sin_addr ), FreeRTOS_ntohs( pxAddress->sin_port ) ) );
/* Port on remote machine. */
pxSocket->u.xTCP.usRemotePort = FreeRTOS_ntohs( pxAddress->sin_port );
/* IP address of remote machine. */
pxSocket->u.xTCP.ulRemoteIP = FreeRTOS_ntohl( pxAddress->sin_addr );
/* (client) internal state: socket wants to send a connect. */
vTCPStateChange( pxSocket, eCONNECT_SYN );
/* To start an active connect. */
pxSocket->u.xTCP.usTimeout = 1U;
if( xSendEventToIPTask( eTCPTimerEvent ) != pdPASS )
{
xResult = -pdFREERTOS_ERRNO_ECANCELED;
}
}
}
return xResult;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Connect to a remote port.
*
* @param[in] xClientSocket: The socket initiating the connection.
* @param[in] pxAddress: The address of the remote socket.
* @param[in] xAddressLength: This parameter is not used. It is kept in
* the function signature to adhere to the Berkeley
* sockets standard.
*
* @return 0 is returned on a successful connection, else a negative
* error code is returned.
*/
BaseType_t FreeRTOS_connect( Socket_t xClientSocket,
struct freertos_sockaddr * pxAddress,
socklen_t xAddressLength )
{
FreeRTOS_Socket_t * pxSocket = ( FreeRTOS_Socket_t * ) xClientSocket;
TickType_t xRemainingTime;
BaseType_t xTimed = pdFALSE;
BaseType_t xResult = -pdFREERTOS_ERRNO_EINVAL;
TimeOut_t xTimeOut;
( void ) xAddressLength;
xResult = prvTCPConnectStart( pxSocket, pxAddress );
if( xResult == 0 )
{
/* And wait for the result */
for( ; ; )
{
if( xTimed == pdFALSE )
{
/* Only in the first round, check for non-blocking */
xRemainingTime = pxSocket->xReceiveBlockTime;
if( xRemainingTime == ( TickType_t ) 0 )
{
/* Not yet connected, correct state, non-blocking. */
xResult = -pdFREERTOS_ERRNO_EWOULDBLOCK;
break;
}
/* Don't get here a second time. */
xTimed = pdTRUE;
/* Fetch the current time */
vTaskSetTimeOutState( &xTimeOut );
}
/* Did it get connected while sleeping ? */
xResult = FreeRTOS_issocketconnected( pxSocket );
/* Returns positive when connected, negative means an error */
if( xResult < 0 )
{
/* Return the error */
break;
}
if( xResult > 0 )
{
/* Socket now connected, return a zero */
xResult = 0;
break;
}
/* Is it allowed to sleep more? */
if( xTaskCheckForTimeOut( &xTimeOut, &xRemainingTime ) != pdFALSE )
{
xResult = -pdFREERTOS_ERRNO_ETIMEDOUT;
break;
}
/* Go sleeping until we get any down-stream event */
( void ) xEventGroupWaitBits( pxSocket->xEventGroup, ( EventBits_t ) eSOCKET_CONNECT, pdTRUE /*xClearOnExit*/, pdFALSE /*xWaitAllBits*/, xRemainingTime );
}
}
return xResult;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Accept a connection on an listening socket.
*
* @param[in] xServerSocket: The socket in listening mode.
* @param[out] pxAddress: The address of the machine trying to connect to this node
* is returned in this pointer.
* @param[out] pxAddressLength: The length of the address of the remote machine.
*
* @return FreeRTOS_accept: can return a new connected socket if the server socket
* is in listen mode and receives a connection request. The new socket will
* be bound already to the same port number as the listening socket.
*/
Socket_t FreeRTOS_accept( Socket_t xServerSocket,
struct freertos_sockaddr * pxAddress,
socklen_t * pxAddressLength )
{
FreeRTOS_Socket_t * pxSocket = ( FreeRTOS_Socket_t * ) xServerSocket;
FreeRTOS_Socket_t * pxClientSocket = NULL;
TickType_t xRemainingTime;
BaseType_t xTimed = pdFALSE, xAsk = pdFALSE;
TimeOut_t xTimeOut;
IPStackEvent_t xAskEvent;
if( prvValidSocket( pxSocket, FREERTOS_IPPROTO_TCP, pdTRUE ) == pdFALSE )
{
/* Not a valid socket or wrong type */
pxClientSocket = FREERTOS_INVALID_SOCKET;
}
else if( ( pxSocket->u.xTCP.bits.bReuseSocket == pdFALSE_UNSIGNED ) &&
( pxSocket->u.xTCP.ucTCPState != ( uint8_t ) eTCP_LISTEN ) )
{
/* Parent socket is not in listening mode */
pxClientSocket = FREERTOS_INVALID_SOCKET;
}
else
{
/* Loop will stop with breaks. */
for( ; ; )
{
/* Is there a new client? */
vTaskSuspendAll();
{
if( pxSocket->u.xTCP.bits.bReuseSocket == pdFALSE_UNSIGNED )
{
pxClientSocket = pxSocket->u.xTCP.pxPeerSocket;
}
else
{
pxClientSocket = pxSocket;
}
if( pxClientSocket != NULL )
{
pxSocket->u.xTCP.pxPeerSocket = NULL;
/* Is it still not taken ? */
if( pxClientSocket->u.xTCP.bits.bPassAccept != pdFALSE_UNSIGNED )
{
pxClientSocket->u.xTCP.bits.bPassAccept = pdFALSE;
}
else
{
pxClientSocket = NULL;
}
}
}
( void ) xTaskResumeAll();
if( pxClientSocket != NULL )
{
if( pxAddress != NULL )
{
/* IP address of remote machine. */
pxAddress->sin_addr = FreeRTOS_ntohl( pxClientSocket->u.xTCP.ulRemoteIP );
/* Port on remote machine. */
pxAddress->sin_port = FreeRTOS_ntohs( pxClientSocket->u.xTCP.usRemotePort );
}
if( pxAddressLength != NULL )
{
*pxAddressLength = sizeof( *pxAddress );
}
if( pxSocket->u.xTCP.bits.bReuseSocket == pdFALSE_UNSIGNED )
{
xAsk = pdTRUE;
}
}
if( xAsk != pdFALSE )
{
/* Ask to set an event in 'xEventGroup' as soon as a new
* client gets connected for this listening socket. */
xAskEvent.eEventType = eTCPAcceptEvent;
xAskEvent.pvData = pxSocket;
( void ) xSendEventStructToIPTask( &xAskEvent, portMAX_DELAY );
}
if( pxClientSocket != NULL )
{
break;
}
if( xTimed == pdFALSE )
{
/* Only in the first round, check for non-blocking */
xRemainingTime = pxSocket->xReceiveBlockTime;
if( xRemainingTime == ( TickType_t ) 0 )
{
break;
}
/* Don't get here a second time */
xTimed = pdTRUE;
/* Fetch the current time */
vTaskSetTimeOutState( &xTimeOut );
}
/* Has the timeout been reached? */
if( xTaskCheckForTimeOut( &xTimeOut, &xRemainingTime ) != pdFALSE )
{
break;
}
/* Go sleeping until we get any down-stream event */
( void ) xEventGroupWaitBits( pxSocket->xEventGroup, ( EventBits_t ) eSOCKET_ACCEPT, pdTRUE /*xClearOnExit*/, pdFALSE /*xWaitAllBits*/, xRemainingTime );
}
}
return pxClientSocket;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Read incoming data from a TCP socket. Only after the last
* byte has been read, a close error might be returned.
*
* @param[in] xSocket: The socket owning the connection.
* @param[out] pvBuffer: The buffer to store the incoming data in.
* @param[in] uxBufferLength: The length of the buffer so that the function
* does not do out of bound access.
* @param[in] xFlags: The flags for conveying preference. The values
* FREERTOS_MSG_DONTWAIT, FREERTOS_ZERO_COPY and/or
* FREERTOS_MSG_PEEK can be used.
*
* @return The number of bytes actually received and stored in the pvBuffer.
*/
BaseType_t FreeRTOS_recv( Socket_t xSocket,
void * pvBuffer,
size_t uxBufferLength,
BaseType_t xFlags )
{
BaseType_t xByteCount;
FreeRTOS_Socket_t * pxSocket = ( FreeRTOS_Socket_t * ) xSocket;
TickType_t xRemainingTime;
BaseType_t xTimed = pdFALSE;
TimeOut_t xTimeOut;
EventBits_t xEventBits = ( EventBits_t ) 0;
/* Check if the socket is valid, has type TCP and if it is bound to a
* port. */
if( prvValidSocket( pxSocket, FREERTOS_IPPROTO_TCP, pdTRUE ) == pdFALSE )
{
xByteCount = -pdFREERTOS_ERRNO_EINVAL;
}
else if( ( ( ( uint32_t ) xFlags & ( uint32_t ) FREERTOS_ZERO_COPY ) != 0U ) &&
( pvBuffer == NULL ) )
{
/* In zero-copy mode, pvBuffer is a pointer to a pointer ( not NULL ). */
xByteCount = -pdFREERTOS_ERRNO_EINVAL;
}
else
{
if( pxSocket->u.xTCP.rxStream != NULL )
{
xByteCount = ( BaseType_t ) uxStreamBufferGetSize( pxSocket->u.xTCP.rxStream );
}
else
{
xByteCount = 0;
}
while( xByteCount == 0 )
{
switch( ipNUMERIC_CAST( eIPTCPState_t, pxSocket->u.xTCP.ucTCPState ) )
{
case eCLOSED:
case eCLOSE_WAIT: /* (server + client) waiting for a connection termination request from the local user. */
case eCLOSING: /* (server + client) waiting for a connection termination request acknowledgement from the remote TCP. */
if( pxSocket->u.xTCP.bits.bMallocError != pdFALSE_UNSIGNED )
{
/* The no-memory error has priority above the non-connected error.
* Both are fatal and will lead to closing the socket. */
xByteCount = -pdFREERTOS_ERRNO_ENOMEM;
}
else
{
xByteCount = -pdFREERTOS_ERRNO_ENOTCONN;
}
break;
case eTCP_LISTEN:
case eCONNECT_SYN:
case eSYN_FIRST:
case eSYN_RECEIVED:
case eESTABLISHED:
case eFIN_WAIT_1:
case eFIN_WAIT_2:
case eLAST_ACK:
case eTIME_WAIT:
default:
/* Nothing. */
break;
}
if( xByteCount < 0 )
{
break;
}
if( xTimed == pdFALSE )
{
/* Only in the first round, check for non-blocking. */
xRemainingTime = pxSocket->xReceiveBlockTime;
if( xRemainingTime == ( TickType_t ) 0 )
{
#if ( ipconfigSUPPORT_SIGNALS != 0 )
{
/* Just check for the interrupt flag. */
xEventBits = xEventGroupWaitBits( pxSocket->xEventGroup, ( EventBits_t ) eSOCKET_INTR,
pdTRUE /*xClearOnExit*/, pdFALSE /*xWaitAllBits*/, socketDONT_BLOCK );
}
#endif /* ipconfigSUPPORT_SIGNALS */
break;
}
if( ( ( uint32_t ) xFlags & ( uint32_t ) FREERTOS_MSG_DONTWAIT ) != 0U )
{
break;
}
/* Don't get here a second time. */
xTimed = pdTRUE;
/* Fetch the current time. */
vTaskSetTimeOutState( &xTimeOut );
}
/* Has the timeout been reached? */
if( xTaskCheckForTimeOut( &xTimeOut, &xRemainingTime ) != pdFALSE )
{
break;
}
/* Block until there is a down-stream event. */
xEventBits = xEventGroupWaitBits( pxSocket->xEventGroup,
( EventBits_t ) eSOCKET_RECEIVE | ( EventBits_t ) eSOCKET_CLOSED | ( EventBits_t ) eSOCKET_INTR,
pdTRUE /*xClearOnExit*/, pdFALSE /*xWaitAllBits*/, xRemainingTime );
#if ( ipconfigSUPPORT_SIGNALS != 0 )
{
if( ( xEventBits & ( EventBits_t ) eSOCKET_INTR ) != 0U )
{
break;
}
}
#else
{
( void ) xEventBits;
}
#endif /* ipconfigSUPPORT_SIGNALS */
if( pxSocket->u.xTCP.rxStream != NULL )
{
xByteCount = ( BaseType_t ) uxStreamBufferGetSize( pxSocket->u.xTCP.rxStream );
}
else
{
xByteCount = 0;
}
}
#if ( ipconfigSUPPORT_SIGNALS != 0 )
if( ( xEventBits & ( EventBits_t ) eSOCKET_INTR ) != 0U )
{
if( ( xEventBits & ( ( EventBits_t ) eSOCKET_RECEIVE | ( EventBits_t ) eSOCKET_CLOSED ) ) != 0U )
{
/* Shouldn't have cleared other flags. */
xEventBits &= ~( ( EventBits_t ) eSOCKET_INTR );
( void ) xEventGroupSetBits( pxSocket->xEventGroup, xEventBits );
}
xByteCount = -pdFREERTOS_ERRNO_EINTR;
}
else
#endif /* ipconfigSUPPORT_SIGNALS */
if( xByteCount > 0 )
{
if( ( ( uint32_t ) xFlags & ( uint32_t ) FREERTOS_ZERO_COPY ) == 0U )
{
BaseType_t xIsPeek = ( ( ( uint32_t ) xFlags & ( uint32_t ) FREERTOS_MSG_PEEK ) != 0U ) ? 1L : 0L;
xByteCount = ( BaseType_t )
uxStreamBufferGet( pxSocket->u.xTCP.rxStream,
0UL,
ipPOINTER_CAST( uint8_t *, pvBuffer ),
( size_t ) uxBufferLength,
xIsPeek );
if( pxSocket->u.xTCP.bits.bLowWater != pdFALSE_UNSIGNED )
{
/* We had reached the low-water mark, now see if the flag
* can be cleared */
size_t uxFrontSpace = uxStreamBufferFrontSpace( pxSocket->u.xTCP.rxStream );
if( uxFrontSpace >= pxSocket->u.xTCP.uxEnoughSpace )
{
pxSocket->u.xTCP.bits.bLowWater = pdFALSE;
pxSocket->u.xTCP.bits.bWinChange = pdTRUE;
pxSocket->u.xTCP.usTimeout = 1U; /* because bLowWater is cleared. */
( void ) xSendEventToIPTask( eTCPTimerEvent );
}
}
}
else
{
/* Zero-copy reception of data: pvBuffer is a pointer to a pointer. */
xByteCount = ( BaseType_t ) uxStreamBufferGetPtr( pxSocket->u.xTCP.rxStream, ipPOINTER_CAST( uint8_t * *, pvBuffer ) );
}
}
else
{
/* Nothing. */
}
} /* prvValidSocket() */
return xByteCount;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Called from FreeRTOS_send(): some checks which will be done before
* sending a TCP packed.
*
* @param[in] pxSocket: The socket owning the connection.
* @param[in] uxDataLength: The length of the data to be sent.
*
* @return 0: representing OK, else a negative error code will be returned.
*/
static int32_t prvTCPSendCheck( FreeRTOS_Socket_t * pxSocket,
size_t uxDataLength )
{
int32_t xResult = 1;
/* Is this a socket of type TCP and is it already bound to a port number ? */
if( prvValidSocket( pxSocket, FREERTOS_IPPROTO_TCP, pdTRUE ) == pdFALSE )
{
xResult = -pdFREERTOS_ERRNO_EINVAL;
}
else if( pxSocket->u.xTCP.bits.bMallocError != pdFALSE_UNSIGNED )
{
xResult = -pdFREERTOS_ERRNO_ENOMEM;
}
else if( ( pxSocket->u.xTCP.ucTCPState == ( uint8_t ) eCLOSED ) ||
( pxSocket->u.xTCP.ucTCPState == ( uint8_t ) eCLOSE_WAIT ) ||
( pxSocket->u.xTCP.ucTCPState == ( uint8_t ) eCLOSING ) )
{
xResult = -pdFREERTOS_ERRNO_ENOTCONN;
}
else if( pxSocket->u.xTCP.bits.bFinSent != pdFALSE_UNSIGNED )
{
/* This TCP connection is closing already, the FIN flag has been sent.
* Maybe it is still delivering or receiving data.
* Return OK in order not to get closed/deleted too quickly */
xResult = 0;
}
else if( uxDataLength == 0UL )
{
/* send() is being called to send zero bytes */
xResult = 0;
}
else if( pxSocket->u.xTCP.txStream == NULL )
{
/* Create the outgoing stream only when it is needed */
( void ) prvTCPCreateStream( pxSocket, pdFALSE );
if( pxSocket->u.xTCP.txStream == NULL )
{
xResult = -pdFREERTOS_ERRNO_ENOMEM;
}
}
else
{
/* Nothing. */
}
return xResult;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Get a direct pointer to the circular transmit buffer.
*
* @param[in] xSocket: The socket owning the buffer.
* @param[in] pxLength: This will contain the number of bytes that may be written.
*
* @return Head of the circular transmit buffer if all checks pass. Or else, NULL
* is returned.
*/
uint8_t * FreeRTOS_get_tx_head( ConstSocket_t xSocket,
BaseType_t * pxLength )
{
uint8_t * pucReturn = NULL;
const FreeRTOS_Socket_t * pxSocket = ( const FreeRTOS_Socket_t * ) xSocket;
StreamBuffer_t * pxBuffer = NULL;
*pxLength = 0;
/* Confirm that this is a TCP socket before dereferencing structure
* member pointers. */
if( prvValidSocket( pxSocket, FREERTOS_IPPROTO_TCP, pdFALSE ) == pdTRUE )
{
pxBuffer = pxSocket->u.xTCP.txStream;
if( pxBuffer != NULL )
{
BaseType_t xSpace = ( BaseType_t ) uxStreamBufferGetSpace( pxBuffer );
BaseType_t xRemain = ( BaseType_t ) pxBuffer->LENGTH - ( BaseType_t ) pxBuffer->uxHead;
*pxLength = FreeRTOS_min_BaseType( xSpace, xRemain );
pucReturn = &( pxBuffer->ucArray[ pxBuffer->uxHead ] );
}
}
return pucReturn;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Send data using a TCP socket. It is not necessary to have the socket
* connected already. Outgoing data will be stored and delivered as soon as
* the socket gets connected.
*
* @param[in] xSocket: The socket owning the connection.
* @param[in] pvBuffer: The buffer containing the data.
* @param[in] uxDataLength: The length of the data to be added.
* @param[in] xFlags: This parameter is not used. (zero or FREERTOS_MSG_DONTWAIT).
*
* @return The number of bytes actually sent. Zero when nothing could be sent
* or a negative error code in case an error occurred.
*/
BaseType_t FreeRTOS_send( Socket_t xSocket,
const void * pvBuffer,
size_t uxDataLength,
BaseType_t xFlags )
{
BaseType_t xByteCount = -pdFREERTOS_ERRNO_EINVAL;
BaseType_t xBytesLeft;
FreeRTOS_Socket_t * pxSocket = ( FreeRTOS_Socket_t * ) xSocket;
TickType_t xRemainingTime;
BaseType_t xTimed = pdFALSE;
TimeOut_t xTimeOut;
BaseType_t xCloseAfterSend;
const uint8_t * pucSource = ipPOINTER_CAST( const uint8_t *, pvBuffer );
/* Prevent compiler warnings about unused parameters. The parameter
* may be used in future versions. */
( void ) xFlags;
if( pvBuffer != NULL )
{
xByteCount = ( BaseType_t ) prvTCPSendCheck( pxSocket, uxDataLength );
}
if( xByteCount > 0 )
{
/* xBytesLeft is number of bytes to send, will count to zero. */
xBytesLeft = ( BaseType_t ) uxDataLength;
/* xByteCount is number of bytes that can be sent now. */
xByteCount = ( BaseType_t ) uxStreamBufferGetSpace( pxSocket->u.xTCP.txStream );
/* While there are still bytes to be sent. */
while( xBytesLeft > 0 )
{
/* If txStream has space. */
if( xByteCount > 0 )
{
/* Don't send more than necessary. */
if( xByteCount > xBytesLeft )
{
xByteCount = xBytesLeft;
}
/* Is the close-after-send flag set and is this really the
* last transmission? */
if( ( pxSocket->u.xTCP.bits.bCloseAfterSend != pdFALSE_UNSIGNED ) && ( xByteCount == xBytesLeft ) )
{
xCloseAfterSend = pdTRUE;
}
else
{
xCloseAfterSend = pdFALSE;
}
/* The flag 'bCloseAfterSend' can be set before sending data
* using setsockopt()
*
* When the last data packet is being sent out, a FIN flag will
* be included to let the peer know that no more data is to be
* expected. The use of 'bCloseAfterSend' is not mandatory, it
* is just a faster way of transferring files (e.g. when using
* FTP). */
if( xCloseAfterSend != pdFALSE )
{
/* Now suspend the scheduler: sending the last data and
* setting bCloseRequested must be done together */
vTaskSuspendAll();
pxSocket->u.xTCP.bits.bCloseRequested = pdTRUE;
}
xByteCount = ( BaseType_t ) uxStreamBufferAdd( pxSocket->u.xTCP.txStream, 0UL, pucSource, ( size_t ) xByteCount );
if( xCloseAfterSend != pdFALSE )
{
/* Now when the IP-task transmits the data, it will also
* see that bCloseRequested is true and include the FIN
* flag to start closure of the connection. */
( void ) xTaskResumeAll();
}
/* Send a message to the IP-task so it can work on this
* socket. Data is sent, let the IP-task work on it. */
pxSocket->u.xTCP.usTimeout = 1U;
if( xIsCallingFromIPTask() == pdFALSE )
{
/* Only send a TCP timer event when not called from the
* IP-task. */
( void ) xSendEventToIPTask( eTCPTimerEvent );
}
xBytesLeft -= xByteCount;
if( xBytesLeft == 0 )
{
break;
}
/* As there are still bytes left to be sent, increase the
* data pointer. */
pucSource = &( pucSource[ xByteCount ] );
}
/* Not all bytes have been sent. In case the socket is marked as
* blocking sleep for a while. */
if( xTimed == pdFALSE )
{
/* Only in the first round, check for non-blocking. */
xRemainingTime = pxSocket->xSendBlockTime;
#if ( ipconfigUSE_CALLBACKS != 0 )
{
if( xIsCallingFromIPTask() != pdFALSE )
{
/* If this send function is called from within a
* call-back handler it may not block, otherwise
* chances would be big to get a deadlock: the IP-task
* waiting for itself. */
xRemainingTime = ( TickType_t ) 0;
}
}
#endif /* ipconfigUSE_CALLBACKS */
if( xRemainingTime == ( TickType_t ) 0 )
{
break;
}
if( ( ( uint32_t ) xFlags & ( uint32_t ) FREERTOS_MSG_DONTWAIT ) != 0U )
{
break;
}
/* Don't get here a second time. */
xTimed = pdTRUE;
/* Fetch the current time. */
vTaskSetTimeOutState( &xTimeOut );
}
else
{
/* Has the timeout been reached? */
if( xTaskCheckForTimeOut( &xTimeOut, &xRemainingTime ) != pdFALSE )
{
break;
}
}
/* Go sleeping until down-stream events are received. */
( void ) xEventGroupWaitBits( pxSocket->xEventGroup, ( EventBits_t ) eSOCKET_SEND | ( EventBits_t ) eSOCKET_CLOSED,
pdTRUE /*xClearOnExit*/, pdFALSE /*xWaitAllBits*/, xRemainingTime );
xByteCount = ( BaseType_t ) uxStreamBufferGetSpace( pxSocket->u.xTCP.txStream );
}
/* How much was actually sent? */
xByteCount = ( ( BaseType_t ) uxDataLength ) - xBytesLeft;
if( xByteCount == 0 )
{
if( pxSocket->u.xTCP.ucTCPState > ( uint8_t ) eESTABLISHED )
{
xByteCount = ( BaseType_t ) -pdFREERTOS_ERRNO_ENOTCONN;
}
else
{
if( ipconfigTCP_MAY_LOG_PORT( pxSocket->usLocalPort ) )
{
FreeRTOS_debug_printf( ( "FreeRTOS_send: %u -> %lxip:%d: no space\n",
pxSocket->usLocalPort,
pxSocket->u.xTCP.ulRemoteIP,
pxSocket->u.xTCP.usRemotePort ) );
}
xByteCount = ( BaseType_t ) -pdFREERTOS_ERRNO_ENOSPC;
}
}
}
return xByteCount;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Request to put a socket in listen mode.
*
* @param[in] xSocket: the socket to be put in listening mode.
* @param[in] xBacklog: Maximum number of child sockets.
*
* @return 0 in case of success, or else a negative error code is
* returned.
*/
BaseType_t FreeRTOS_listen( Socket_t xSocket,
BaseType_t xBacklog )
{
FreeRTOS_Socket_t * pxSocket;
BaseType_t xResult = 0;
pxSocket = ( FreeRTOS_Socket_t * ) xSocket;
/* listen() is allowed for a valid TCP socket in Closed state and already
* bound. */
if( prvValidSocket( pxSocket, FREERTOS_IPPROTO_TCP, pdTRUE ) == pdFALSE )
{
xResult = -pdFREERTOS_ERRNO_EOPNOTSUPP;
}
else if( ( pxSocket->u.xTCP.ucTCPState != ( uint8_t ) eCLOSED ) && ( pxSocket->u.xTCP.ucTCPState != ( uint8_t ) eCLOSE_WAIT ) )
{
/* Socket is in a wrong state. */
xResult = -pdFREERTOS_ERRNO_EOPNOTSUPP;
}
else
{
/* Backlog is interpreted here as "the maximum number of child
* sockets. */
pxSocket->u.xTCP.usBacklog = ( uint16_t ) FreeRTOS_min_int32( ( int32_t ) 0xffff, ( int32_t ) xBacklog );
/* This cleaning is necessary only if a listening socket is being
* reused as it might have had a previous connection. */
if( pxSocket->u.xTCP.bits.bReuseSocket != pdFALSE_UNSIGNED )
{
if( pxSocket->u.xTCP.rxStream != NULL )
{
vStreamBufferClear( pxSocket->u.xTCP.rxStream );
}
if( pxSocket->u.xTCP.txStream != NULL )
{
vStreamBufferClear( pxSocket->u.xTCP.txStream );
}
( void ) memset( pxSocket->u.xTCP.xPacket.u.ucLastPacket, 0, sizeof( pxSocket->u.xTCP.xPacket.u.ucLastPacket ) );
( void ) memset( &pxSocket->u.xTCP.xTCPWindow, 0, sizeof( pxSocket->u.xTCP.xTCPWindow ) );
( void ) memset( &pxSocket->u.xTCP.bits, 0, sizeof( pxSocket->u.xTCP.bits ) );
/* Now set the bReuseSocket flag again, because the bits have
* just been cleared. */
pxSocket->u.xTCP.bits.bReuseSocket = pdTRUE;
}
vTCPStateChange( pxSocket, eTCP_LISTEN );
}
return xResult;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Shutdown - This function will shut down the connection in both
* directions. However, it will first deliver all data queued for
* transmission, and also it will first wait to receive any missing
* packets from the peer.
*
* @param[in] xSocket: The socket owning the connection.
* @param[in] xHow: Not used. Just present to stick to Berkeley standard.
*
* @return 0 on successful shutdown or else a negative error code.
*/
BaseType_t FreeRTOS_shutdown( Socket_t xSocket,
BaseType_t xHow )
{
FreeRTOS_Socket_t * pxSocket = ( FreeRTOS_Socket_t * ) xSocket;
BaseType_t xResult;
if( prvValidSocket( pxSocket, FREERTOS_IPPROTO_TCP, pdTRUE ) == pdFALSE )
{
/*_RB_ Is this comment correct? The socket is not of a type that
* supports the listen() operation. */
xResult = -pdFREERTOS_ERRNO_EOPNOTSUPP;
}
else if( pxSocket->u.xTCP.ucTCPState != ( uint8_t ) eESTABLISHED )
{
/*_RB_ Is this comment correct? The socket is not of a type that
* supports the listen() operation. */
xResult = -pdFREERTOS_ERRNO_EOPNOTSUPP;
}
else
{
pxSocket->u.xTCP.bits.bUserShutdown = pdTRUE_UNSIGNED;
/* Let the IP-task perform the shutdown of the connection. */
pxSocket->u.xTCP.usTimeout = 1U;
( void ) xSendEventToIPTask( eTCPTimerEvent );
xResult = 0;
}
( void ) xHow;
return xResult;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief A TCP timer has expired, now check all TCP sockets for:
* - Active connect
* - Send a delayed ACK
* - Send new data
* - Send a keep-alive packet
* - Check for timeout (in non-connected states only)
*
* @param[in] xWillSleep: Whether the calling task is going to sleep.
*
* @return Minimum amount of time before the timer shall expire.
*/
TickType_t xTCPTimerCheck( BaseType_t xWillSleep )
{
FreeRTOS_Socket_t * pxSocket;
TickType_t xShortest = pdMS_TO_TICKS( ( TickType_t ) ipTCP_TIMER_PERIOD_MS );
TickType_t xNow = xTaskGetTickCount();
static TickType_t xLastTime = 0U;
TickType_t xDelta = xNow - xLastTime;
const ListItem_t * pxEnd = listGET_END_MARKER( &xBoundTCPSocketsList );
const ListItem_t * pxIterator = ( const ListItem_t * ) listGET_HEAD_ENTRY( &xBoundTCPSocketsList );
xLastTime = xNow;
if( xDelta == 0U )
{
xDelta = 1U;
}
while( pxIterator != pxEnd )
{
pxSocket = ipCAST_PTR_TO_TYPE_PTR( FreeRTOS_Socket_t, listGET_LIST_ITEM_OWNER( pxIterator ) );
pxIterator = ( ListItem_t * ) listGET_NEXT( pxIterator );
/* Sockets with 'timeout == 0' do not need any regular attention. */
if( pxSocket->u.xTCP.usTimeout == 0U )
{
continue;
}
if( xDelta < ( TickType_t ) pxSocket->u.xTCP.usTimeout )
{
pxSocket->u.xTCP.usTimeout = ( uint16_t ) ( ( ( TickType_t ) pxSocket->u.xTCP.usTimeout ) - xDelta );
}
else
{
BaseType_t xRc;
pxSocket->u.xTCP.usTimeout = 0U;
xRc = xTCPSocketCheck( pxSocket );
/* Within this function, the socket might want to send a delayed
* ack or send out data or whatever it needs to do. */
if( xRc < 0 )
{
/* Continue because the socket was deleted. */
continue;
}
}
/* In xEventBits the driver may indicate that the socket has
* important events for the user. These are only done just before the
* IP-task goes to sleep. */
if( pxSocket->xEventBits != 0U )
{
if( xWillSleep != pdFALSE )
{
/* The IP-task is about to go to sleep, so messages can be
* sent to the socket owners. */
vSocketWakeUpUser( pxSocket );
}
else
{
/* Or else make sure this will be called again to wake-up
* the sockets' owner. */
xShortest = ( TickType_t ) 0;
}
}
if( ( pxSocket->u.xTCP.usTimeout != 0U ) && ( xShortest > ( TickType_t ) pxSocket->u.xTCP.usTimeout ) )
{
xShortest = ( TickType_t ) pxSocket->u.xTCP.usTimeout;
}
}
return xShortest;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief As multiple sockets may be bound to the same local port number
* looking up a socket is a little more complex: Both a local port,
* and a remote port and IP address are being used to find a match.
* For a socket in listening mode, the remote port and IP address
* are both 0.
*
* @param[in] ulLocalIP: Local IP address. Ignored for now.
* @param[in] uxLocalPort: Local port number.
* @param[in] ulRemoteIP: Remote (peer) IP address.
* @param[in] uxRemotePort: Remote (peer) port.
*
* @return The socket which was found.
*/
FreeRTOS_Socket_t * pxTCPSocketLookup( uint32_t ulLocalIP,
UBaseType_t uxLocalPort,
uint32_t ulRemoteIP,
UBaseType_t uxRemotePort )
{
const ListItem_t * pxIterator;
FreeRTOS_Socket_t * pxResult = NULL, * pxListenSocket = NULL;
const ListItem_t * pxEnd = listGET_END_MARKER( &xBoundTCPSocketsList );
/* Parameter not yet supported. */
( void ) ulLocalIP;
for( pxIterator = listGET_NEXT( pxEnd );
pxIterator != pxEnd;
pxIterator = listGET_NEXT( pxIterator ) )
{
FreeRTOS_Socket_t * pxSocket = ipCAST_PTR_TO_TYPE_PTR( FreeRTOS_Socket_t, listGET_LIST_ITEM_OWNER( pxIterator ) );
if( pxSocket->usLocalPort == ( uint16_t ) uxLocalPort )
{
if( pxSocket->u.xTCP.ucTCPState == ( uint8_t ) eTCP_LISTEN )
{
/* If this is a socket listening to uxLocalPort, remember it
* in case there is no perfect match. */
pxListenSocket = pxSocket;
}
else if( ( pxSocket->u.xTCP.usRemotePort == ( uint16_t ) uxRemotePort ) && ( pxSocket->u.xTCP.ulRemoteIP == ulRemoteIP ) )
{
/* For sockets not in listening mode, find a match with
* xLocalPort, ulRemoteIP AND xRemotePort. */
pxResult = pxSocket;
break;
}
else
{
/* This 'pxSocket' doesn't match. */
}
}
}
if( pxResult == NULL )
{
/* An exact match was not found, maybe a listening socket was
* found. */
pxResult = pxListenSocket;
}
return pxResult;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief For the web server: borrow the circular Rx buffer for inspection.
* HTML driver wants to see if a sequence of 13/10/13/10 is available.
*
* @param[in] xSocket: The socket whose Rx stream is to be returned.
*
* @return The Rx stream of the socket if all checks pass, else NULL.
*/
const struct xSTREAM_BUFFER * FreeRTOS_get_rx_buf( ConstSocket_t xSocket )
{
const FreeRTOS_Socket_t * pxSocket = ( const FreeRTOS_Socket_t * ) xSocket;
const struct xSTREAM_BUFFER * pxReturn = NULL;
/* Confirm that this is a TCP socket before dereferencing structure
* member pointers. */
if( prvValidSocket( pxSocket, FREERTOS_IPPROTO_TCP, pdFALSE ) == pdTRUE )
{
pxReturn = pxSocket->u.xTCP.rxStream;
}
return pxReturn;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Create the stream buffer for the given socket.
*
* @param[in] pxSocket: the socket to create the stream for.
* @param[in] xIsInputStream: Is this input stream? pdTRUE/pdFALSE?
*
* @return The stream buffer.
*/
static StreamBuffer_t * prvTCPCreateStream( FreeRTOS_Socket_t * pxSocket,
BaseType_t xIsInputStream )
{
StreamBuffer_t * pxBuffer;
size_t uxLength;
size_t uxSize;
/* Now that a stream is created, the maximum size is fixed before
* creation, it could still be changed with setsockopt(). */
if( xIsInputStream != pdFALSE )
{
uxLength = pxSocket->u.xTCP.uxRxStreamSize;
if( pxSocket->u.xTCP.uxLittleSpace == 0UL )
{
pxSocket->u.xTCP.uxLittleSpace = ( sock20_PERCENT * pxSocket->u.xTCP.uxRxStreamSize ) / sock100_PERCENT;
}
if( pxSocket->u.xTCP.uxEnoughSpace == 0UL )
{
pxSocket->u.xTCP.uxEnoughSpace = ( sock80_PERCENT * pxSocket->u.xTCP.uxRxStreamSize ) / sock100_PERCENT;
}
}
else
{
uxLength = pxSocket->u.xTCP.uxTxStreamSize;
}
/* Add an extra 4 (or 8) bytes. */
uxLength += sizeof( size_t );
/* And make the length a multiple of sizeof( size_t ). */
uxLength &= ~( sizeof( size_t ) - 1U );
uxSize = ( sizeof( *pxBuffer ) + uxLength ) - sizeof( pxBuffer->ucArray );
pxBuffer = ipCAST_PTR_TO_TYPE_PTR( StreamBuffer_t, pvPortMallocLarge( uxSize ) );
if( pxBuffer == NULL )
{
FreeRTOS_debug_printf( ( "prvTCPCreateStream: malloc failed\n" ) );
pxSocket->u.xTCP.bits.bMallocError = pdTRUE;
vTCPStateChange( pxSocket, eCLOSE_WAIT );
}
else
{
/* Clear the markers of the stream */
( void ) memset( pxBuffer, 0, sizeof( *pxBuffer ) - sizeof( pxBuffer->ucArray ) );
pxBuffer->LENGTH = ( size_t ) uxLength;
if( xTCPWindowLoggingLevel != 0 )
{
FreeRTOS_debug_printf( ( "prvTCPCreateStream: %cxStream created %u bytes (total %u)\n", ( xIsInputStream != 0 ) ? 'R' : 'T', uxLength, uxSize ) );
}
if( xIsInputStream != 0 )
{
iptraceMEM_STATS_CREATE( tcpRX_STREAM_BUFFER, pxBuffer, uxSize );
pxSocket->u.xTCP.rxStream = pxBuffer;
}
else
{
iptraceMEM_STATS_CREATE( tcpTX_STREAM_BUFFER, pxBuffer, uxSize );
pxSocket->u.xTCP.txStream = pxBuffer;
}
}
return pxBuffer;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Add data to the RxStream. When uxOffset > 0, data has come in out-of-order
* and will be put in front of the head so it can not be popped by the user.
*
* @param[in] pxSocket: The socket to whose RxStream data is to be added.
* @param[in] uxOffset: Offset of the packet.
* @param[in] pcData: The data to be added to the RxStream.
* @param[in] ulByteCount: Number of bytes in the data.
*
* @return The number of bytes actually added to the RxStream. Or else, a negative
* error code is returned.
*/
int32_t lTCPAddRxdata( FreeRTOS_Socket_t * pxSocket,
size_t uxOffset,
const uint8_t * pcData,
uint32_t ulByteCount )
{
StreamBuffer_t * pxStream = pxSocket->u.xTCP.rxStream;
int32_t xResult = 0;
#if ( ipconfigUSE_CALLBACKS == 1 )
BaseType_t bHasHandler = ipconfigIS_VALID_PROG_ADDRESS( pxSocket->u.xTCP.pxHandleReceive ) ? pdTRUE : pdFALSE;
const uint8_t * pucBuffer = NULL;
#endif /* ipconfigUSE_CALLBACKS */
/* int32_t uxStreamBufferAdd( pxBuffer, uxOffset, pucData, aCount )
* if( pucData != NULL ) copy data the the buffer
* if( pucData == NULL ) no copying, just advance rxHead
* if( uxOffset != 0 ) Just store data which has come out-of-order
* if( uxOffset == 0 ) Also advance rxHead */
if( pxStream == NULL )
{
pxStream = prvTCPCreateStream( pxSocket, pdTRUE );
if( pxStream == NULL )
{
xResult = -1;
}
}
if( xResult >= 0 )
{
#if ( ipconfigUSE_CALLBACKS == 1 )
{
if( ( bHasHandler != pdFALSE ) && ( uxStreamBufferGetSize( pxStream ) == 0U ) && ( uxOffset == 0UL ) && ( pcData != NULL ) )
{
/* Data can be passed directly to the user */
pucBuffer = pcData;
pcData = NULL;
}
}
#endif /* ipconfigUSE_CALLBACKS */
xResult = ( int32_t ) uxStreamBufferAdd( pxStream, uxOffset, pcData, ( size_t ) ulByteCount );
#if ( ipconfigHAS_DEBUG_PRINTF != 0 )
{
if( xResult != ( int32_t ) ulByteCount )
{
FreeRTOS_debug_printf( ( "lTCPAddRxdata: at %u: %d/%u bytes (tail %u head %u space %u front %u)\n",
( UBaseType_t ) uxOffset,
( BaseType_t ) xResult,
( UBaseType_t ) ulByteCount,
( UBaseType_t ) pxStream->uxTail,
( UBaseType_t ) pxStream->uxHead,
( UBaseType_t ) uxStreamBufferFrontSpace( pxStream ),
( UBaseType_t ) pxStream->uxFront ) );
}
}
#endif /* ipconfigHAS_DEBUG_PRINTF */
if( uxOffset == 0U )
{
/* Data is being added to rxStream at the head (offs = 0) */
#if ( ipconfigUSE_CALLBACKS == 1 )
if( bHasHandler != pdFALSE )
{
/* The socket owner has installed an OnReceive handler. Pass the
* Rx data, without copying from the rxStream, to the user. */
for( ; ; )
{
uint8_t * ucReadPtr = NULL;
uint32_t ulCount;
if( pucBuffer != NULL )
{
ucReadPtr = ipPOINTER_CAST( uint8_t *, pucBuffer );
ulCount = ulByteCount;
pucBuffer = NULL;
}
else
{
ulCount = ( uint32_t ) uxStreamBufferGetPtr( pxStream, &( ucReadPtr ) );
}
if( ulCount == 0UL )
{
break;
}
( void ) pxSocket->u.xTCP.pxHandleReceive( pxSocket, ucReadPtr, ( size_t ) ulCount );
( void ) uxStreamBufferGet( pxStream, 0UL, NULL, ( size_t ) ulCount, pdFALSE );
}
}
else
#endif /* ipconfigUSE_CALLBACKS */
{
/* See if running out of space. */
if( pxSocket->u.xTCP.bits.bLowWater == pdFALSE_UNSIGNED )
{
size_t uxFrontSpace = uxStreamBufferFrontSpace( pxSocket->u.xTCP.rxStream );
if( uxFrontSpace <= pxSocket->u.xTCP.uxLittleSpace )
{
pxSocket->u.xTCP.bits.bLowWater = pdTRUE;
pxSocket->u.xTCP.bits.bWinChange = pdTRUE;
/* bLowWater was reached, send the changed window size. */
pxSocket->u.xTCP.usTimeout = 1U;
( void ) xSendEventToIPTask( eTCPTimerEvent );
}
}
/* New incoming data is available, wake up the user. User's
* semaphores will be set just before the IP-task goes asleep. */
pxSocket->xEventBits |= ( EventBits_t ) eSOCKET_RECEIVE;
#if ipconfigSUPPORT_SELECT_FUNCTION == 1
{
if( ( pxSocket->xSelectBits & ( EventBits_t ) eSELECT_READ ) != 0U )
{
pxSocket->xEventBits |= ( ( ( EventBits_t ) eSELECT_READ ) << SOCKET_EVENT_BIT_COUNT );
}
}
#endif
}
}
}
return xResult;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Function to get the remote IP-address and port number.
*
* @param[in] xSocket: Socket owning the connection.
* @param[out] pxAddress: The address pointer to which the address
* is to be added.
*
* @return The size of the address being returned. Or else a negative
* error code will be returned.
*/
BaseType_t FreeRTOS_GetRemoteAddress( ConstSocket_t xSocket,
struct freertos_sockaddr * pxAddress )
{
const FreeRTOS_Socket_t * pxSocket = ( const FreeRTOS_Socket_t * ) xSocket;
BaseType_t xResult;
if( pxSocket->ucProtocol != ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
xResult = -pdFREERTOS_ERRNO_EINVAL;
}
else
{
/* BSD style sockets communicate IP and port addresses in network
* byte order.
* IP address of remote machine. */
pxAddress->sin_addr = FreeRTOS_htonl( pxSocket->u.xTCP.ulRemoteIP );
/* Port on remote machine. */
pxAddress->sin_port = FreeRTOS_htons( pxSocket->u.xTCP.usRemotePort );
xResult = ( BaseType_t ) sizeof( *pxAddress );
}
return xResult;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Check the number of bytes that may be added to txStream.
*
* @param[in] xSocket: The socket to be checked.
*
* @return the number of bytes that may be added to txStream or
* else a negative error code.
*/
BaseType_t FreeRTOS_maywrite( ConstSocket_t xSocket )
{
const FreeRTOS_Socket_t * pxSocket = ( const FreeRTOS_Socket_t * ) xSocket;
BaseType_t xResult;
if( pxSocket->ucProtocol != ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
xResult = -pdFREERTOS_ERRNO_EINVAL;
}
else if( pxSocket->u.xTCP.ucTCPState != ( uint8_t ) eESTABLISHED )
{
if( ( pxSocket->u.xTCP.ucTCPState < ( uint8_t ) eCONNECT_SYN ) || ( pxSocket->u.xTCP.ucTCPState > ( EventBits_t ) eESTABLISHED ) )
{
xResult = -1;
}
else
{
xResult = 0;
}
}
else if( pxSocket->u.xTCP.txStream == NULL )
{
xResult = ( BaseType_t ) pxSocket->u.xTCP.uxTxStreamSize;
}
else
{
xResult = ( BaseType_t ) uxStreamBufferGetSpace( pxSocket->u.xTCP.txStream );
}
return xResult;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Get the number of bytes that can be written in the Tx buffer
* of the given socket.
*
* @param[in] xSocket: the socket to be checked.
*
* @return The bytes that can be written. Or else an error code.
*/
BaseType_t FreeRTOS_tx_space( ConstSocket_t xSocket )
{
const FreeRTOS_Socket_t * pxSocket = ( const FreeRTOS_Socket_t * ) xSocket;
BaseType_t xReturn;
if( pxSocket->ucProtocol != ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
xReturn = -pdFREERTOS_ERRNO_EINVAL;
}
else
{
if( pxSocket->u.xTCP.txStream != NULL )
{
xReturn = ( BaseType_t ) uxStreamBufferGetSpace( pxSocket->u.xTCP.txStream );
}
else
{
xReturn = ( BaseType_t ) pxSocket->u.xTCP.uxTxStreamSize;
}
}
return xReturn;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Returns the number of bytes stored in the Tx buffer.
*
* @param[in] xSocket: The socket to be checked.
*
* @return The number of bytes stored in the Tx buffer of the socket.
* Or an error code.
*/
BaseType_t FreeRTOS_tx_size( ConstSocket_t xSocket )
{
const FreeRTOS_Socket_t * pxSocket = ( const FreeRTOS_Socket_t * ) xSocket;
BaseType_t xReturn;
if( pxSocket->ucProtocol != ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
xReturn = -pdFREERTOS_ERRNO_EINVAL;
}
else
{
if( pxSocket->u.xTCP.txStream != NULL )
{
xReturn = ( BaseType_t ) uxStreamBufferGetSize( pxSocket->u.xTCP.txStream );
}
else
{
xReturn = 0;
}
}
return xReturn;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Is the socket connected.
*
* @param[in] xSocket: The socket being checked.
*
* @return pdTRUE if TCP socket is connected.
*/
BaseType_t FreeRTOS_issocketconnected( ConstSocket_t xSocket )
{
const FreeRTOS_Socket_t * pxSocket = ( const FreeRTOS_Socket_t * ) xSocket;
BaseType_t xReturn = pdFALSE;
if( pxSocket->ucProtocol != ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
xReturn = -pdFREERTOS_ERRNO_EINVAL;
}
else
{
if( pxSocket->u.xTCP.ucTCPState >= ( uint8_t ) eESTABLISHED )
{
if( pxSocket->u.xTCP.ucTCPState < ( uint8_t ) eCLOSE_WAIT )
{
xReturn = pdTRUE;
}
}
}
return xReturn;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Get the actual value of Maximum Segment Size ( MSS ) being used.
*
* @param[in] xSocket: The socket whose MSS is to be returned.
*
* @return the actual size of MSS being used or an error code.
*/
BaseType_t FreeRTOS_mss( ConstSocket_t xSocket )
{
const FreeRTOS_Socket_t * pxSocket = ( const FreeRTOS_Socket_t * ) xSocket;
BaseType_t xReturn;
if( pxSocket->ucProtocol != ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
xReturn = -pdFREERTOS_ERRNO_EINVAL;
}
else
{
/* usCurMSS is declared as uint16_t to save space. FreeRTOS_mss()
* will often be used in signed native-size expressions cast it to
* BaseType_t. */
xReturn = ( BaseType_t ) ( pxSocket->u.xTCP.usCurMSS );
}
return xReturn;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Get the connection status. The values correspond to the members
* of the enum 'eIPTCPState_t'.
*
* @param[in] xSocket: Socket to get the connection status from.
*
* @return The connection status or an error code.
*
* @note For internal use only.
*/
BaseType_t FreeRTOS_connstatus( ConstSocket_t xSocket )
{
const FreeRTOS_Socket_t * pxSocket = ( const FreeRTOS_Socket_t * ) xSocket;
BaseType_t xReturn;
if( pxSocket->ucProtocol != ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
xReturn = -pdFREERTOS_ERRNO_EINVAL;
}
else
{
/* Cast it to BaseType_t. */
xReturn = ( BaseType_t ) ( pxSocket->u.xTCP.ucTCPState );
}
return xReturn;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Returns the number of bytes which can be read from the RX stream buffer.
*
* @param[in] xSocket: the socket to get the number of bytes from.
*
* @return Returns the number of bytes which can be read. Or an error
* code is returned.
*/
BaseType_t FreeRTOS_rx_size( ConstSocket_t xSocket )
{
const FreeRTOS_Socket_t * pxSocket = ( const FreeRTOS_Socket_t * ) xSocket;
BaseType_t xReturn;
if( pxSocket->ucProtocol != ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
xReturn = -pdFREERTOS_ERRNO_EINVAL;
}
else if( pxSocket->u.xTCP.rxStream != NULL )
{
xReturn = ( BaseType_t ) uxStreamBufferGetSize( pxSocket->u.xTCP.rxStream );
}
else
{
xReturn = 0;
}
return xReturn;
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if 0
/**
* @brief Returns the number of packets that are stored in a UDP socket.
*
* @param[in] xSocket: the socket to get the number of bytes from.
*
* @return Returns the number of packets that are stored. Use FreeRTOS_recvfrom()
* to retrieve those packets.
*/
BaseType_t FreeRTOS_udp_rx_size( Socket_t xSocket )
{
BaseType_t xReturn = 0;
const FreeRTOS_Socket_t * pxSocket = ( const FreeRTOS_Socket_t * ) xSocket;
if( pxSocket->ucProtocol == ( uint8_t ) FREERTOS_IPPROTO_UDP )
{
xReturn = ( BaseType_t ) listCURRENT_LIST_LENGTH( &( pxSocket->u.xUDP.xWaitingPacketsList ) );
}
else
{
xReturn = -pdFREERTOS_ERRNO_EINVAL;
}
return xReturn;
}
#endif /* 0 */
#if ( ipconfigUSE_TCP == 1 )
/**
* @brief Get the net status. The IP-task will print a summary of all sockets and
* their connections.
*/
void FreeRTOS_netstat( void )
{
IPStackEvent_t xAskEvent;
/* Ask the IP-task to call vTCPNetStat()
* to avoid accessing xBoundTCPSocketsList
*/
xAskEvent.eEventType = eTCPNetStat;
xAskEvent.pvData = ( void * ) NULL;
( void ) xSendEventStructToIPTask( &xAskEvent, pdMS_TO_TICKS( 1000U ) );
}
#endif /* ipconfigUSE_TCP */
/*-----------------------------------------------------------*/
#if ( ( ipconfigHAS_PRINTF != 0 ) && ( ipconfigUSE_TCP == 1 ) )
/**
* @brief Print a summary of all sockets and their connections.
*/
void vTCPNetStat( void )
{
/* Show a simple listing of all created sockets and their connections */
const ListItem_t * pxIterator;
BaseType_t count = 0;
size_t uxMinimum = uxGetMinimumFreeNetworkBuffers();
size_t uxCurrent = uxGetNumberOfFreeNetworkBuffers();
if( !listLIST_IS_INITIALISED( &xBoundTCPSocketsList ) )
{
FreeRTOS_printf( ( "PLUS-TCP not initialized\n" ) );
}
else
{
const ListItem_t * pxEndTCP = listGET_END_MARKER( &xBoundTCPSocketsList );
const ListItem_t * pxEndUDP = listGET_END_MARKER( &xBoundUDPSocketsList );
FreeRTOS_printf( ( "Prot Port IP-Remote : Port R/T Status Alive tmout Child\n" ) );
for( pxIterator = listGET_HEAD_ENTRY( &xBoundTCPSocketsList );
pxIterator != pxEndTCP;
pxIterator = listGET_NEXT( pxIterator ) )
{
const FreeRTOS_Socket_t * pxSocket = ipCAST_CONST_PTR_TO_CONST_TYPE_PTR( FreeRTOS_Socket_t, listGET_LIST_ITEM_OWNER( pxIterator ) );
#if ( ipconfigTCP_KEEP_ALIVE == 1 )
TickType_t age = xTaskGetTickCount() - pxSocket->u.xTCP.xLastAliveTime;
#else
TickType_t age = 0U;
#endif
char ucChildText[ 16 ] = "";
if( pxSocket->u.xTCP.ucTCPState == ( uint8_t ) eTCP_LISTEN )
{
/* Using function "snprintf". */
const int32_t copied_len = snprintf( ucChildText, sizeof( ucChildText ), " %d/%d",
( int32_t ) pxSocket->u.xTCP.usChildCount,
( int32_t ) pxSocket->u.xTCP.usBacklog );
( void ) copied_len;
/* These should never evaluate to false since the buffers are both shorter than 5-6 characters (<=65535) */
configASSERT( copied_len >= 0 );
configASSERT( copied_len < ( int32_t ) sizeof( ucChildText ) );
}
FreeRTOS_printf( ( "TCP %5d %-16lxip:%5d %d/%d %-13.13s %6lu %6u%s\n",
pxSocket->usLocalPort, /* Local port on this machine */
pxSocket->u.xTCP.ulRemoteIP, /* IP address of remote machine */
pxSocket->u.xTCP.usRemotePort, /* Port on remote machine */
( pxSocket->u.xTCP.rxStream != NULL ) ? 1 : 0,
( pxSocket->u.xTCP.txStream != NULL ) ? 1 : 0,
FreeRTOS_GetTCPStateName( pxSocket->u.xTCP.ucTCPState ),
( age > 999999u ) ? 999999u : age, /* Format 'age' for printing */
pxSocket->u.xTCP.usTimeout,
ucChildText ) );
count++;
}
for( pxIterator = listGET_HEAD_ENTRY( &xBoundUDPSocketsList );
pxIterator != pxEndUDP;
pxIterator = listGET_NEXT( pxIterator ) )
{
/* Local port on this machine */
FreeRTOS_printf( ( "UDP Port %5u\n",
FreeRTOS_ntohs( listGET_LIST_ITEM_VALUE( pxIterator ) ) ) );
count++;
}
FreeRTOS_printf( ( "FreeRTOS_netstat: %lu sockets %lu < %lu < %ld buffers free\n",
( UBaseType_t ) count,
( UBaseType_t ) uxMinimum,
( UBaseType_t ) uxCurrent,
( BaseType_t ) ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS ) );
}
}
#endif /* ( ( ipconfigHAS_PRINTF != 0 ) && ( ipconfigUSE_TCP == 1 ) ) */
/*-----------------------------------------------------------*/
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
/**
* @brief This internal non-blocking function will check all sockets that belong
* to a select set. The events bits of each socket will be updated, and it
* will check if an ongoing select() call must be interrupted because of an
* event has occurred.
*
* @param[in] pxSocketSet: The socket-set which is to be waited on for change.
*/
void vSocketSelect( SocketSelect_t * pxSocketSet )
{
BaseType_t xRound;
EventBits_t xSocketBits, xBitsToClear;
#if ipconfigUSE_TCP == 1
BaseType_t xLastRound = 1;
#else
BaseType_t xLastRound = 0;
#endif
/* These flags will be switched on after checking the socket status. */
EventBits_t xGroupBits = 0;
for( xRound = 0; xRound <= xLastRound; xRound++ )
{
const ListItem_t * pxIterator;
const ListItem_t * pxEnd;
if( xRound == 0 )
{
pxEnd = listGET_END_MARKER( &xBoundUDPSocketsList );
}
#if ipconfigUSE_TCP == 1
else
{
pxEnd = listGET_END_MARKER( &xBoundTCPSocketsList );
}
#endif /* ipconfigUSE_TCP == 1 */
for( pxIterator = listGET_NEXT( pxEnd );
pxIterator != pxEnd;
pxIterator = listGET_NEXT( pxIterator ) )
{
FreeRTOS_Socket_t * pxSocket = ipCAST_PTR_TO_TYPE_PTR( FreeRTOS_Socket_t, listGET_LIST_ITEM_OWNER( pxIterator ) );
if( pxSocket->pxSocketSet != pxSocketSet )
{
/* Socket does not belong to this select group. */
continue;
}
xSocketBits = 0;
#if ( ipconfigUSE_TCP == 1 )
if( pxSocket->ucProtocol == ( uint8_t ) FREERTOS_IPPROTO_TCP )
{
/* Check if the socket has already been accepted by the
* owner. If not, it is useless to return it from a
* select(). */
BaseType_t bAccepted = pdFALSE;
if( pxSocket->u.xTCP.bits.bPassQueued == pdFALSE_UNSIGNED )
{
if( pxSocket->u.xTCP.bits.bPassAccept == pdFALSE_UNSIGNED )
{
bAccepted = pdTRUE;
}
}
/* Is the set owner interested in READ events? */
if( ( pxSocket->xSelectBits & ( EventBits_t ) eSELECT_READ ) != ( EventBits_t ) 0U )
{
if( pxSocket->u.xTCP.ucTCPState == ( uint8_t ) eTCP_LISTEN )
{
if( ( pxSocket->u.xTCP.pxPeerSocket != NULL ) && ( pxSocket->u.xTCP.pxPeerSocket->u.xTCP.bits.bPassAccept != pdFALSE_UNSIGNED ) )
{
xSocketBits |= ( EventBits_t ) eSELECT_READ;
}
}
else if( ( pxSocket->u.xTCP.bits.bReuseSocket != pdFALSE_UNSIGNED ) && ( pxSocket->u.xTCP.bits.bPassAccept != pdFALSE_UNSIGNED ) )
{
/* This socket has the re-use flag. After connecting it turns into
* a connected socket. Set the READ event, so that accept() will be called. */
xSocketBits |= ( EventBits_t ) eSELECT_READ;
}
else if( ( bAccepted != 0 ) && ( FreeRTOS_recvcount( pxSocket ) > 0 ) )
{
xSocketBits |= ( EventBits_t ) eSELECT_READ;
}
else
{
/* Nothing. */
}
}
/* Is the set owner interested in EXCEPTION events? */
if( ( pxSocket->xSelectBits & ( EventBits_t ) eSELECT_EXCEPT ) != 0U )
{
if( ( pxSocket->u.xTCP.ucTCPState == ( uint8_t ) eCLOSE_WAIT ) || ( pxSocket->u.xTCP.ucTCPState == ( uint8_t ) eCLOSED ) )
{
xSocketBits |= ( EventBits_t ) eSELECT_EXCEPT;
}
}
/* Is the set owner interested in WRITE events? */
if( ( pxSocket->xSelectBits & ( EventBits_t ) eSELECT_WRITE ) != 0U )
{
BaseType_t bMatch = pdFALSE;
if( bAccepted != 0 )
{
if( FreeRTOS_tx_space( pxSocket ) > 0 )
{
bMatch = pdTRUE;
}
}
if( bMatch == pdFALSE )
{
if( ( pxSocket->u.xTCP.bits.bConnPrepared != pdFALSE_UNSIGNED ) &&
( pxSocket->u.xTCP.ucTCPState >= ( uint8_t ) eESTABLISHED ) &&
( pxSocket->u.xTCP.bits.bConnPassed == pdFALSE_UNSIGNED ) )
{
pxSocket->u.xTCP.bits.bConnPassed = pdTRUE;
bMatch = pdTRUE;
}
}
if( bMatch != pdFALSE )
{
xSocketBits |= ( EventBits_t ) eSELECT_WRITE;
}
}
}
else
#endif /* ipconfigUSE_TCP == 1 */
{
/* Select events for UDP are simpler. */
if( ( ( pxSocket->xSelectBits & ( EventBits_t ) eSELECT_READ ) != 0U ) &&
( listCURRENT_LIST_LENGTH( &( pxSocket->u.xUDP.xWaitingPacketsList ) ) > 0U ) )
{
xSocketBits |= ( EventBits_t ) eSELECT_READ;
}
/* The WRITE and EXCEPT bits are not used for UDP */
} /* if( pxSocket->ucProtocol == FREERTOS_IPPROTO_TCP ) */
/* Each socket keeps its own event flags, which are looked-up
* by FreeRTOS_FD_ISSSET() */
pxSocket->xSocketBits = xSocketBits;
/* The ORed value will be used to set the bits in the event
* group. */
xGroupBits |= xSocketBits;
} /* for( pxIterator ... ) */
} /* for( xRound = 0; xRound <= xLastRound; xRound++ ) */
xBitsToClear = xEventGroupGetBits( pxSocketSet->xSelectGroup );
/* Now set the necessary bits. */
xBitsToClear = ( xBitsToClear & ~xGroupBits ) & ( ( EventBits_t ) eSELECT_ALL );
#if ( ipconfigSUPPORT_SIGNALS != 0 )
{
/* Maybe the socketset was signalled, but don't
* clear the 'eSELECT_INTR' bit here, as it will be used
* and cleared in FreeRTOS_select(). */
xBitsToClear &= ~( ( EventBits_t ) eSELECT_INTR );
}
#endif /* ipconfigSUPPORT_SIGNALS */
if( xBitsToClear != 0U )
{
( void ) xEventGroupClearBits( pxSocketSet->xSelectGroup, xBitsToClear );
}
/* Now include eSELECT_CALL_IP to wakeup the caller. */
( void ) xEventGroupSetBits( pxSocketSet->xSelectGroup, xGroupBits | ( EventBits_t ) eSELECT_CALL_IP );
}
#endif /* ipconfigSUPPORT_SELECT_FUNCTION == 1 */
/*-----------------------------------------------------------*/
#if ( ipconfigSUPPORT_SIGNALS != 0 )
/**
* @brief Send a signal to the task which reads from this socket.
* The socket will receive an event of the type 'eSOCKET_INTR'.
* Any ongoing blocking API ( e.g. FreeRTOS_recv() ) will be terminated
* and return the value -pdFREERTOS_ERRNO_EINTR ( -4 ).
*
* @param[in] xSocket: The socket that will be signalled.
*/
BaseType_t FreeRTOS_SignalSocket( Socket_t xSocket )
{
FreeRTOS_Socket_t * pxSocket = ( FreeRTOS_Socket_t * ) xSocket;
BaseType_t xReturn;
if( pxSocket == NULL )
{
xReturn = -pdFREERTOS_ERRNO_EINVAL;
}
else
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
if( ( pxSocket->pxSocketSet != NULL ) && ( pxSocket->pxSocketSet->xSelectGroup != NULL ) )
{
( void ) xEventGroupSetBits( pxSocket->pxSocketSet->xSelectGroup, ( EventBits_t ) eSELECT_INTR );
xReturn = 0;
}
else
#endif /* ipconfigSUPPORT_SELECT_FUNCTION */
if( pxSocket->xEventGroup != NULL )
{
( void ) xEventGroupSetBits( pxSocket->xEventGroup, ( EventBits_t ) eSOCKET_INTR );
xReturn = 0;
}
else
{
xReturn = -pdFREERTOS_ERRNO_EINVAL;
}
return xReturn;
}
#endif /* ipconfigSUPPORT_SIGNALS */
/*-----------------------------------------------------------*/
#if ( ipconfigSUPPORT_SIGNALS != 0 )
/**
* @brief The same as 'FreeRTOS_SignalSocket()', except that this function should
* be called from an ISR context.
*
* @param[in] xSocket: The socket that will be signalled.
* @param[in,out] pxHigherPriorityTaskWoken: will be set to non-zero in case a higher-
* priority task has become runnable.
*/
BaseType_t FreeRTOS_SignalSocketFromISR( Socket_t xSocket,
BaseType_t * pxHigherPriorityTaskWoken )
{
FreeRTOS_Socket_t * pxSocket = ( FreeRTOS_Socket_t * ) xSocket;
BaseType_t xReturn;
IPStackEvent_t xEvent;
configASSERT( pxSocket != NULL );
configASSERT( pxSocket->ucProtocol == ( uint8_t ) FREERTOS_IPPROTO_TCP );
configASSERT( pxSocket->xEventGroup != NULL );
xEvent.eEventType = eSocketSignalEvent;
xEvent.pvData = pxSocket;
/* The IP-task will call FreeRTOS_SignalSocket for this socket. */
xReturn = xQueueSendToBackFromISR( xNetworkEventQueue, &xEvent, pxHigherPriorityTaskWoken );
return xReturn;
}
#endif /* ipconfigSUPPORT_SIGNALS */
/*-----------------------------------------------------------*/
#if 0
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
struct pollfd
{
Socket_t fd; /* file descriptor */
EventBits_t events; /* requested events */
EventBits_t revents; /* returned events */
};
typedef BaseType_t nfds_t;
BaseType_t poll( struct pollfd * fds,
nfds_t nfds,
BaseType_t timeout );
BaseType_t poll( struct pollfd * fds,
nfds_t nfds,
BaseType_t timeout )
{
BaseType_t index;
SocketSelect_t * pxSocketSet = NULL;
BaseType_t xReturn = 0;
/* See which socket-sets have been created and bound to the sockets involved. */
for( index = 0; index < nfds; index++ )
{
FreeRTOS_Socket_t * pxSocket = ( FreeRTOS_Socket_t * ) fds[ index ].fd;
if( pxSocket->pxSocketSet != NULL )
{
if( pxSocketSet == NULL )
{
/* Use this socket-set. */
pxSocketSet = pxSocket->pxSocketSet;
xReturn = 1;
}
else if( pxSocketSet == pxSocket->pxSocketSet )
{
/* Good: associated with the same socket-set. */
}
else
{
/* More than one socket-set is found: can not do a select on 2 sets. */
xReturn = -1;
break;
}
}
}
if( xReturn == 0 )
{
/* Create a new socket-set, and attach all sockets to it. */
pxSocketSet = FreeRTOS_CreateSocketSet();
if( pxSocketSet != NULL )
{
xReturn = 1;
}
else
{
xReturn = -2;
}
/* Memory leak: when the last socket closes, there is no more reference to
* this socket-set. It should be marked as an automatic or anonymous socket-set,
* so when closing the last member, its memory will be freed. */
}
if( xReturn > 0 )
{
/* Only one socket-set is found. Connect all sockets to this socket-set. */
for( index = 0; index < nfds; index++ )
{
FreeRTOS_Socket_t * pxSocket = ( FreeRTOS_Socket_t * ) fds[ index ].fd;
EventBits_t xEventBits = fds[ index ].events;
FreeRTOS_FD_SET( pxSocket, pxSocketSet, xEventBits );
FreeRTOS_FD_CLR( pxSocket, pxSocketSet, ( EventBits_t ) ~xEventBits );
}
/* And sleep until an event happens or a time-out. */
xReturn = FreeRTOS_select( pxSocketSet, timeout );
/* Now set the return events, copying from the socked field 'xSocketBits'. */
for( index = 0; index < nfds; index++ )
{
FreeRTOS_Socket_t * pxSocket = ( FreeRTOS_Socket_t * ) fds[ index ].fd;
fds[ index ].revents = pxSocket->xSocketBits & ( ( EventBits_t ) eSELECT_ALL );
}
}
else
{
/* -1: Sockets are connected to different socket sets. */
/* -2: FreeRTOS_CreateSocketSet() failed. */
}
return xReturn;
}
#endif /* ipconfigSUPPORT_SELECT_FUNCTION */
#endif /* 0 */
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