error_t udpSendDatagramEx(NetInterface *interface, uint16_t srcPort, const IpAddr *destIpAddr,
uint16_t destPort, NetBuffer *buffer, size_t offset, uint8_t ttl)
{
error_t error;
size_t length;
UdpHeader *header;
IpPseudoHeader pseudoHeader;
//Make room for the UDP header
offset -= sizeof(UdpHeader);
//Retrieve the length of the datagram
length = netBufferGetLength(buffer) - offset;
//Point to the UDP header
header = netBufferAt(buffer, offset);
//Sanity check
if(!header) return ERROR_FAILURE;
//Format UDP header
header->srcPort = htons(srcPort);
header->destPort = htons(destPort);
header->length = htons(length);
header->checksum = 0;
#if (IPV4_SUPPORT == ENABLED)
//Destination address is an IPv4 address?
if(destIpAddr->length == sizeof(Ipv4Addr))
{
Ipv4Addr srcIpAddr;
//Select the source IPv4 address and the relevant network interface
//to use when sending data to the specified destination host
error = ipv4SelectSourceAddr(&interface, destIpAddr->ipv4Addr, &srcIpAddr);
//Any error to report?
if(error) return error;
//Format IPv4 pseudo header
pseudoHeader.length = sizeof(Ipv4PseudoHeader);
pseudoHeader.ipv4Data.srcAddr = srcIpAddr;
pseudoHeader.ipv4Data.destAddr = destIpAddr->ipv4Addr;
pseudoHeader.ipv4Data.reserved = 0;
pseudoHeader.ipv4Data.protocol = IPV4_PROTOCOL_UDP;
pseudoHeader.ipv4Data.length = htons(length);
//Calculate UDP header checksum
header->checksum = ipCalcUpperLayerChecksumEx(&pseudoHeader.ipv4Data,
sizeof(Ipv4PseudoHeader), buffer, offset, length);
}
else
#endif
#if (IPV6_SUPPORT == ENABLED)
//Destination address is an IPv6 address?
if(destIpAddr->length == sizeof(Ipv6Addr))
{
//Select the source IPv6 address and the relevant network interface
//to use when sending data to the specified destination host
error = ipv6SelectSourceAddr(&interface,
&destIpAddr->ipv6Addr, &pseudoHeader.ipv6Data.srcAddr);
//Any error to report?
if(error) return error;
//Format IPv6 pseudo header
pseudoHeader.length = sizeof(Ipv6PseudoHeader);
pseudoHeader.ipv6Data.destAddr = destIpAddr->ipv6Addr;
pseudoHeader.ipv6Data.length = htonl(length);
pseudoHeader.ipv6Data.reserved = 0;
pseudoHeader.ipv6Data.nextHeader = IPV6_UDP_HEADER;
//Calculate UDP header checksum
header->checksum = ipCalcUpperLayerChecksumEx(&pseudoHeader.ipv6Data,
sizeof(Ipv6PseudoHeader), buffer, offset, length);
}
else
#endif
//Invalid destination address?
{
//An internal error has occurred
return ERROR_FAILURE;
}
//Debug message
TRACE_INFO("Sending UDP datagram (%" PRIuSIZE " bytes)\r\n", length);
//Dump UDP header contents for debugging purpose
udpDumpHeader(header);
//Send UDP datagram
return ipSendDatagram(interface, &pseudoHeader, buffer, offset, ttl);
}
error_t rawSocketSendIpPacket(Socket *socket, const IpAddr *destIpAddr,
const void *data, size_t length, size_t *written)
{
error_t error;
size_t offset;
uint_t timeToLive;
NetBuffer *buffer;
NetInterface *interface;
IpPseudoHeader pseudoHeader;
//The socket may be bound to a particular network interface
interface = socket->interface;
//Allocate a buffer memory to hold the raw IP datagram
buffer = ipAllocBuffer(0, &offset);
//Failed to allocate memory?
if(!buffer) return ERROR_OUT_OF_MEMORY;
//Start of exception handling block
do
{
//Copy the raw data
error = netBufferAppend(buffer, data, length);
//Any error to report?
if(error) break;
#if (IPV4_SUPPORT == ENABLED)
//Destination address is an IPv4 address?
if(destIpAddr->length == sizeof(Ipv4Addr))
{
Ipv4Addr srcIpAddr;
//Select the source IPv4 address and the relevant network interface
//to use when sending data to the specified destination host
error = ipv4SelectSourceAddr(&interface, destIpAddr->ipv4Addr, &srcIpAddr);
//Any error to report?
if(error) break;
//Format IPv4 pseudo header
pseudoHeader.length = sizeof(Ipv4PseudoHeader);
pseudoHeader.ipv4Data.srcAddr = srcIpAddr;
pseudoHeader.ipv4Data.destAddr = destIpAddr->ipv4Addr;
pseudoHeader.ipv4Data.reserved = 0;
pseudoHeader.ipv4Data.protocol = socket->protocol;
pseudoHeader.ipv4Data.length = htons(length);
//Set TTL value
timeToLive = IPV4_DEFAULT_TTL;
}
else
#endif
#if (IPV6_SUPPORT == ENABLED)
//Destination address is an IPv6 address?
if(destIpAddr->length == sizeof(Ipv6Addr))
{
//Select the source IPv6 address and the relevant network interface
//to use when sending data to the specified destination host
error = ipv6SelectSourceAddr(&interface,
&destIpAddr->ipv6Addr, &pseudoHeader.ipv6Data.srcAddr);
//Any error to report?
if(error) break;
//Format IPv6 pseudo header
pseudoHeader.length = sizeof(Ipv6PseudoHeader);
pseudoHeader.ipv6Data.destAddr = destIpAddr->ipv6Addr;
pseudoHeader.ipv6Data.length = htonl(length);
pseudoHeader.ipv6Data.reserved = 0;
pseudoHeader.ipv6Data.nextHeader = socket->protocol;
//Set Hop Limit value
timeToLive = IPV6_DEFAULT_HOP_LIMIT;
}
else
#endif
//Invalid destination address?
{
//An internal error has occurred
error = ERROR_FAILURE;
//Exit immediately
break;
}
//Send raw IP datagram
error = ipSendDatagram(interface, &pseudoHeader, buffer, offset, timeToLive);
//Failed to send data?
if(error) break;
//Total number of bytes successfully transmitted
if(written != NULL)
*written = length;
//End of exception handling block
} while(0);
//Free previously allocated memory block
netBufferFree(buffer);
//Return status code
return error;
}
