error_t udpReceiveDatagram(Socket *socket, IpAddr *srcIpAddr, uint16_t *srcPort,
IpAddr *destIpAddr, void *data, size_t size, size_t *received, uint_t flags)
{
SocketQueueItem *queueItem;
//The receive queue is empty?
if(!socket->receiveQueue)
{
//Set the events the application is interested in
socket->eventMask = SOCKET_EVENT_RX_READY;
//Reset the event object
osEventReset(socket->event);
//Leave critical section
osMutexRelease(socketMutex);
//Wait until an event is triggered
osEventWait(socket->event, socket->timeout);
//Enter critical section
osMutexAcquire(socketMutex);
}
//Check whether the read operation timed out
if(!socket->receiveQueue)
{
//No data can be read
*received = 0;
//Report a timeout error
return ERROR_TIMEOUT;
}
//Point to the first item in the receive queue
queueItem = socket->receiveQueue;
//Copy data to user buffer
*received = chunkedBufferRead(data, queueItem->buffer, queueItem->offset, size);
//Save the source IP address
if(srcIpAddr)
*srcIpAddr = queueItem->srcIpAddr;
//Save the source port number
if(srcPort)
*srcPort = queueItem->srcPort;
//Save the destination IP address
if(destIpAddr)
*destIpAddr = queueItem->destIpAddr;
//If the SOCKET_FLAG_PEEK flag is set, the data is copied
//into the buffer but is not removed from the input queue
if(!(flags & SOCKET_FLAG_PEEK))
{
//Remove the item from the receive queue
socket->receiveQueue = queueItem->next;
//Deallocate memory buffer
chunkedBufferFree(queueItem->buffer);
}
//Update the state of events
udpUpdateEvents(socket);
//Successful read operation
return NO_ERROR;
}
error_t socketRegisterEvents(Socket *socket, OsEvent *event, uint_t eventMask)
{
//Make sure the socket handle is valid
if(!socket)
return ERROR_INVALID_PARAMETER;
//Enter critical section
osAcquireMutex(&socketMutex);
//An user event may have been previously registered...
if(socket->userEvent != NULL)
socket->eventMask |= eventMask;
else
socket->eventMask = eventMask;
//Suscribe to get notified of events
socket->userEvent = event;
#if (TCP_SUPPORT == ENABLED)
//Handle TCP specific events
if(socket->type == SOCKET_TYPE_STREAM)
{
tcpUpdateEvents(socket);
}
#endif
#if (UDP_SUPPORT == ENABLED)
//Handle UDP specific events
if(socket->type == SOCKET_TYPE_DGRAM)
{
udpUpdateEvents(socket);
}
#endif
#if (RAW_SOCKET_SUPPORT == ENABLED)
//Handle events that are specific to raw sockets
if(socket->type == SOCKET_TYPE_RAW_IP ||
socket->type == SOCKET_TYPE_RAW_ETH)
{
rawSocketUpdateEvents(socket);
}
#endif
//Leave critical section
osReleaseMutex(&socketMutex);
//Successful processing
return NO_ERROR;
}
error_t udpProcessDatagram(NetInterface *interface,
IpPseudoHeader *pseudoHeader, const NetBuffer *buffer, size_t offset)
{
error_t error;
uint_t i;
size_t length;
UdpHeader *header;
Socket *socket;
SocketQueueItem *queueItem;
NetBuffer *p;
//Retrieve the length of the UDP datagram
length = netBufferGetLength(buffer) - offset;
//Ensure the UDP header is valid
if(length < sizeof(UdpHeader))
{
//Debug message
TRACE_WARNING("UDP datagram length is invalid!\r\n");
//Report an error
return ERROR_INVALID_HEADER;
}
//Point to the UDP header
header = netBufferAt(buffer, offset);
//Sanity check
if(!header) return ERROR_FAILURE;
//Debug message
TRACE_INFO("UDP datagram received (%" PRIuSIZE " bytes)...\r\n", length);
//Dump UDP header contents for debugging purpose
udpDumpHeader(header);
//When UDP runs over IPv6, the checksum is mandatory
if(header->checksum || pseudoHeader->length == sizeof(Ipv6PseudoHeader))
{
//Verify UDP checksum
if(ipCalcUpperLayerChecksumEx(pseudoHeader->data,
pseudoHeader->length, buffer, offset, length) != 0xFFFF)
{
//Debug message
TRACE_WARNING("Wrong UDP header checksum!\r\n");
//Report an error
return ERROR_WRONG_CHECKSUM;
}
}
//Enter critical section
osAcquireMutex(&socketMutex);
//Loop through opened sockets
for(i = 0; i < SOCKET_MAX_COUNT; i++)
{
//Point to the current socket
socket = socketTable + i;
//UDP socket found?
if(socket->type != SOCKET_TYPE_DGRAM)
continue;
//Check whether the socket is bound to a particular interface
if(socket->interface && socket->interface != interface)
continue;
//Check destination port number
if(socket->localPort != ntohs(header->destPort))
continue;
//Source port number filtering
if(socket->remotePort && socket->remotePort != ntohs(header->srcPort))
continue;
#if (IPV4_SUPPORT == ENABLED)
//An IPv4 packet was received?
if(pseudoHeader->length == sizeof(Ipv4PseudoHeader))
{
//Destination IP address filtering
if(socket->localIpAddr.length)
{
//An IPv4 address is expected
if(socket->localIpAddr.length != sizeof(Ipv4Addr))
continue;
//Filter out non-matching addresses
if(socket->localIpAddr.ipv4Addr != pseudoHeader->ipv4Data.destAddr)
continue;
}
//Source IP address filtering
if(socket->remoteIpAddr.length)
{
//An IPv4 address is expected
if(socket->remoteIpAddr.length != sizeof(Ipv4Addr))
continue;
//Filter out non-matching addresses
if(socket->remoteIpAddr.ipv4Addr != pseudoHeader->ipv4Data.srcAddr)
continue;
}
}
else
#endif
#if (IPV6_SUPPORT == ENABLED)
//An IPv6 packet was received?
if(pseudoHeader->length == sizeof(Ipv6PseudoHeader))
{
//Destination IP address filtering
if(socket->localIpAddr.length)
{
//An IPv6 address is expected
if(socket->localIpAddr.length != sizeof(Ipv6Addr))
continue;
//Filter out non-matching addresses
if(!ipv6CompAddr(&socket->localIpAddr.ipv6Addr, &pseudoHeader->ipv6Data.destAddr))
continue;
}
//Source IP address filtering
if(socket->remoteIpAddr.length)
{
//An IPv6 address is expected
if(socket->remoteIpAddr.length != sizeof(Ipv6Addr))
continue;
//Filter out non-matching addresses
if(!ipv6CompAddr(&socket->remoteIpAddr.ipv6Addr, &pseudoHeader->ipv6Data.srcAddr))
continue;
}
}
else
#endif
//An invalid packet was received?
{
//This should never occur...
continue;
}
//The current socket meets all the criteria
break;
}
//Point to the payload
offset += sizeof(UdpHeader);
length -= sizeof(UdpHeader);
//No matching socket found?
if(i >= SOCKET_MAX_COUNT)
{
//Leave critical section
osReleaseMutex(&socketMutex);
//Invoke user callback, if any
error = udpInvokeRxCallback(interface, pseudoHeader, header, buffer, offset);
//Return status code
return error;
}
//Empty receive queue?
if(!socket->receiveQueue)
{
//Allocate a memory buffer to hold the data and the associated descriptor
p = netBufferAlloc(sizeof(SocketQueueItem) + length);
//Successful memory allocation?
if(p != NULL)
{
//Point to the newly created item
queueItem = netBufferAt(p, 0);
queueItem->buffer = p;
//Add the newly created item to the queue
socket->receiveQueue = queueItem;
}
else
{
//Memory allocation failed
queueItem = NULL;
}
}
else
{
//Point to the very first item
queueItem = socket->receiveQueue;
//Reach the last item in the receive queue
for(i = 1; queueItem->next; i++)
queueItem = queueItem->next;
//Make sure the receive queue is not full
if(i >= UDP_RX_QUEUE_SIZE)
{
//Leave critical section
osReleaseMutex(&socketMutex);
//Notify the calling function that the queue is full
return ERROR_RECEIVE_QUEUE_FULL;
}
//Allocate a memory buffer to hold the data and the associated descriptor
p = netBufferAlloc(sizeof(SocketQueueItem) + length);
//Successful memory allocation?
if(p != NULL)
{
//Add the newly created item to the queue
queueItem->next = netBufferAt(p, 0);
//Point to the newly created item
queueItem = queueItem->next;
queueItem->buffer = p;
}
else
{
//Memory allocation failed
queueItem = NULL;
}
}
//Failed to allocate memory?
if(!queueItem)
{
//Leave critical section
osReleaseMutex(&socketMutex);
//Return error code
return ERROR_OUT_OF_MEMORY;
}
//Initialize next field
queueItem->next = NULL;
//Record the source port number
queueItem->srcPort = ntohs(header->srcPort);
#if (IPV4_SUPPORT == ENABLED)
//IPv4 remote address?
if(pseudoHeader->length == sizeof(Ipv4PseudoHeader))
{
//Save the source IPv4 address
queueItem->srcIpAddr.length = sizeof(Ipv4Addr);
queueItem->srcIpAddr.ipv4Addr = pseudoHeader->ipv4Data.srcAddr;
//Save the destination IPv4 address
queueItem->destIpAddr.length = sizeof(Ipv4Addr);
queueItem->destIpAddr.ipv4Addr = pseudoHeader->ipv4Data.destAddr;
}
#endif
#if (IPV6_SUPPORT == ENABLED)
//IPv6 remote address?
if(pseudoHeader->length == sizeof(Ipv6PseudoHeader))
{
//Save the source IPv6 address
queueItem->srcIpAddr.length = sizeof(Ipv6Addr);
queueItem->srcIpAddr.ipv6Addr = pseudoHeader->ipv6Data.srcAddr;
//Save the destination IPv6 address
queueItem->destIpAddr.length = sizeof(Ipv6Addr);
queueItem->destIpAddr.ipv6Addr = pseudoHeader->ipv6Data.destAddr;
}
#endif
//Offset to the payload
queueItem->offset = sizeof(SocketQueueItem);
//Copy the payload
netBufferCopy(queueItem->buffer, queueItem->offset, buffer, offset, length);
//Notify user that data is available
udpUpdateEvents(socket);
//Leave critical section
osReleaseMutex(&socketMutex);
//Successful processing
return NO_ERROR;
}
