/** @see org.jnode.driver.net.spi.AbstractNetDriver#doTransmit(SocketBuffer, HardwareAddress) */
protected void doTransmitEthernet(SocketBuffer skbuf, HardwareAddress destination)
throws NetworkException {
try {
// Pad
if (skbuf.getSize() < ETH_ZLEN) {
skbuf.append(ETH_ZLEN - skbuf.getSize());
}
abstractDeviceCore.transmit(skbuf, destination, TRANSMIT_TIMEOUT);
} catch (InterruptedException ex) {
throw new NetworkException("Interrupted", ex);
} catch (TimeoutException ex) {
throw new NetworkException("Timeout", ex);
}
}
/** @see java.net.DatagramSocketImpl#receive(java.net.DatagramPacket) */
protected void onReceive(DatagramPacket p, SocketBuffer skbuf) throws IOException {
final IPv4Header ipHdr = (IPv4Header) skbuf.getNetworkLayerHeader();
final UDPHeader udpHdr = (UDPHeader) skbuf.getTransportLayerHeader();
p.setData(skbuf.toByteArray(), 0, skbuf.getSize());
p.setAddress(ipHdr.getSource().toInetAddress());
p.setPort(udpHdr.getSrcPort());
}
/** Initialize this ring to its default (empty) state */
public void initialize(SocketBuffer src) {
// Setup the DPD
// Copy the data from the buffer
final int len = src.getSize();
if (len > EthernetConstants.ETH_FRAME_LEN) {
throw new IllegalArgumentException("Length must be <= ETH_FRAME_LEN");
}
src.get(data, firstDPDOffset, 0, len);
}
/**
* Send an TCP packet
*
* @param skbuf
*/
protected void send(IPv4Header ipHdr, TCPHeader tcpHdr, SocketBuffer skbuf)
throws SocketException {
if (DEBUG) {
if (log.isDebugEnabled()) {
log.debug("send(ipHdr, " + tcpHdr + ')');
}
}
skbuf.setTransportLayerHeader(tcpHdr);
tcpHdr.prefixTo(skbuf);
ipHdr.setDataLength(skbuf.getSize());
ipService.transmit(ipHdr, skbuf);
stat.opackets.inc();
}
/**
* Process a packet that has been received and matches getType()
*
* @param skbuf
* @param deviceAPI
* @throws SocketException
*/
public void receive(SocketBuffer skbuf, NetDeviceAPI deviceAPI) throws SocketException {
// Update statistics
stat.ipackets.inc();
// Get IP header
final IPv4Header hdr = new IPv4Header(skbuf);
if (!hdr.isChecksumOk()) {
stat.badsum.inc();
return;
}
// Set the header object in the buffer-field
skbuf.setNetworkLayerHeader(hdr);
// Remove header from skbuf-data
skbuf.pull(hdr.getLength());
// Trim the end of the message, to we have a valid length
skbuf.trim(hdr.getDataLength());
// Now test if the size of the buffer equals the datalength in the
// header, if now ignore the packet
if (skbuf.getSize() < hdr.getDataLength()) {
stat.badlen.inc();
return;
}
// Update the ARP cache for the source address
updateARPCache(skbuf.getLinkLayerHeader().getSourceAddress(), hdr.getSourceAddress());
// Get my IP address
final IPv4ProtocolAddressInfo myAddrInfo =
(IPv4ProtocolAddressInfo) deviceAPI.getProtocolAddressInfo(getProtocolID());
if (myAddrInfo == null) {
stat.nodevaddr.inc();
}
// Should I process this packet, or is it for somebody else?
final IPv4Address dstAddr = hdr.getDestination();
final boolean shouldProcess;
if (myAddrInfo != null) {
shouldProcess = myAddrInfo.contains(dstAddr);
} else {
// I don't have an IP address yet, if the linklayer says
// it is for me, we'll process it, otherwise we'll drop it.
shouldProcess = !skbuf.getLinkLayerHeader().getDestinationAddress().isBroadcast();
}
if (!shouldProcess) {
// log.debug("IPPacket not for me, ignoring (dst=" + dstAddr + ")");
return;
}
// Is it a fragment?
if (hdr.isFragment()) {
// Yes it is a fragment
stat.fragments.inc();
deliverFragment(hdr, skbuf);
} else {
// It is a complete packet, find the protocol handler
// and let it do the rest
deliver(hdr, skbuf);
}
// Do a cleanup of the fragmentlist from time to time
final long now = System.currentTimeMillis();
if ((now - lastFragmentCleanup) >= (IP_FRAGTIMEOUT * 2)) {
removeDeadFragments();
}
}
