openflow-protocol-impl/src/main/java/org/opendaylight/openflowjava/protocol/impl/core/OFDatagramPacketHandler.java

   1 /*
   2  * Copyright (c) 2014 Pantheon Technologies s.r.o. and others. All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.openflowjava.protocol.impl.core;
  10
  11 import io.netty.buffer.ByteBuf;
  12 import io.netty.channel.ChannelHandlerContext;
  13 import io.netty.channel.socket.DatagramPacket;
  14 import io.netty.handler.codec.MessageToMessageDecoder;
  15
  16 import java.util.List;
  17
  18 import org.opendaylight.openflowjava.protocol.api.connection.SwitchConnectionHandler;
  19 import org.opendaylight.openflowjava.protocol.api.util.EncodeConstants;
  20 import org.opendaylight.openflowjava.protocol.impl.core.connection.ConnectionAdapterFactory;
  21 import org.opendaylight.openflowjava.protocol.impl.core.connection.ConnectionAdapterFactoryImpl;
  22 import org.opendaylight.openflowjava.protocol.impl.core.connection.ConnectionFacade;
  23 import org.opendaylight.openflowjava.protocol.impl.core.connection.MessageConsumer;
  24 import org.opendaylight.openflowjava.util.ByteBufUtils;
  25 import org.slf4j.Logger;
  26 import org.slf4j.LoggerFactory;
  27
  28 /**
  29  * @author michal.polkorab
  30  *
  31  */
  32 public class OFDatagramPacketHandler extends MessageToMessageDecoder<DatagramPacket> {
  33
  34     private static final Logger LOGGER = LoggerFactory.getLogger(OFDatagramPacketHandler.class);
  35
  36     /** Length of OpenFlow 1.3 header */
  37     public static final byte LENGTH_OF_HEADER = 8;
  38     private static final byte LENGTH_INDEX_IN_HEADER = 2;
  39     private ConnectionAdapterFactory adapterFactory = new ConnectionAdapterFactoryImpl();
  40     private SwitchConnectionHandler connectionHandler;
  41
  42     /**
  43      * Default constructor
  44      * @param sch the switchConnectionHandler that decides
  45      * what to do with incomming message / channel
  46      */
  47     public OFDatagramPacketHandler(SwitchConnectionHandler sch) {
  48         this.connectionHandler = sch;
  49     }
  50
  51     @Override
  52     public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
  53         LOGGER.warn("Unexpected exception from downstream.", cause);
  54         LOGGER.warn("Closing connection.");
  55         ctx.close();
  56     }
  57
  58     @Override
  59     protected void decode(ChannelHandlerContext ctx, DatagramPacket msg,
  60             List<Object> out) throws Exception {
  61         LOGGER.debug("OFDatagramPacketFramer");
  62         MessageConsumer consumer = UdpConnectionMap.getMessageConsumer(msg.sender());
  63         if (consumer == null) {
  64             ConnectionFacade connectionFacade =
  65                     adapterFactory.createConnectionFacade(ctx.channel(), msg.sender());
  66             connectionHandler.onSwitchConnected(connectionFacade);
  67             connectionFacade.checkListeners();
  68             UdpConnectionMap.addConnection(msg.sender(), connectionFacade);
  69         }
  70         ByteBuf bb = msg.content();
  71         int readableBytes = bb.readableBytes();
  72         if (readableBytes < LENGTH_OF_HEADER) {
  73             if (LOGGER.isDebugEnabled()) {
  74                 LOGGER.debug("skipping bytebuf - too few bytes for header: " + readableBytes + " < " + LENGTH_OF_HEADER );
  75                 LOGGER.debug("bb: " + ByteBufUtils.byteBufToHexString(bb));
  76             }
  77             return;
  78         }
  79
  80         int length = bb.getUnsignedShort(bb.readerIndex() + LENGTH_INDEX_IN_HEADER);
  81         LOGGER.debug("length of actual message: {}", length);
  82
  83         if (readableBytes < length) {
  84             if (LOGGER.isDebugEnabled()) {
  85                 LOGGER.debug("skipping bytebuf - too few bytes for msg: " +
  86                         readableBytes + " < " + length);
  87                 LOGGER.debug("bytebuffer: " + ByteBufUtils.byteBufToHexString(bb));
  88             }
  89             return;
  90         }
  91         LOGGER.debug("OF Protocol message received, type:{}", bb.getByte(bb.readerIndex() + 1));
  92
  93
  94         byte version = bb.readByte();
  95         if ((version == EncodeConstants.OF13_VERSION_ID) || (version == EncodeConstants.OF10_VERSION_ID)) {
  96             LOGGER.debug("detected version: " + version);
  97             ByteBuf messageBuffer = bb.slice();
  98             out.add(new VersionMessageUdpWrapper(version, messageBuffer, msg.sender()));
  99             messageBuffer.retain();
 100         } else {
 101             LOGGER.warn("detected version: " + version + " - currently not supported");
 102         }
 103         bb.skipBytes(bb.readableBytes());
 104     }
 105 }