openflowjava/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 import java.util.List;
  16 import org.opendaylight.openflowjava.protocol.api.connection.SwitchConnectionHandler;
  17 import org.opendaylight.openflowjava.protocol.api.util.EncodeConstants;
  18 import org.opendaylight.openflowjava.protocol.impl.core.connection.ConnectionAdapterFactory;
  19 import org.opendaylight.openflowjava.protocol.impl.core.connection.ConnectionAdapterFactoryImpl;
  20 import org.opendaylight.openflowjava.protocol.impl.core.connection.ConnectionFacade;
  21 import org.opendaylight.openflowjava.protocol.impl.core.connection.MessageConsumer;
  22 import org.opendaylight.openflowjava.util.ByteBufUtils;
  23 import org.slf4j.Logger;
  24 import org.slf4j.LoggerFactory;
  25
  26 /**
  27  * Handler for datagram packets.
  28  *
  29  * @author michal.polkorab
  30  */
  31 public class OFDatagramPacketHandler extends MessageToMessageDecoder<DatagramPacket> {
  32
  33     private static final Logger LOG = LoggerFactory.getLogger(OFDatagramPacketHandler.class);
  34
  35     /** Length of OpenFlow 1.3 header. */
  36     public static final byte LENGTH_OF_HEADER = 8;
  37     private static final byte LENGTH_INDEX_IN_HEADER = 2;
  38     private final ConnectionAdapterFactory adapterFactory = new ConnectionAdapterFactoryImpl();
  39     private final SwitchConnectionHandler connectionHandler;
  40     private int channelOutboundQueueSize;
  41
  42     /**
  43      * Default constructor.
  44      *
  45      * @param sch the switchConnectionHandler that decides what to do with incomming message / channel
  46      * @param channelOutboundQueueSize the queue size is made configurable
  47      */
  48
  49     public OFDatagramPacketHandler(SwitchConnectionHandler sch, int channelOutboundQueueSize) {
  50         this.connectionHandler = sch;
  51         this.channelOutboundQueueSize = channelOutboundQueueSize;
  52     }
  53
  54     @Override
  55     public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
  56         LOG.warn("Unexpected exception from downstream.", cause);
  57         LOG.warn("Closing connection.");
  58         ctx.close();
  59     }
  60
  61     @Override
  62     protected void decode(ChannelHandlerContext ctx, DatagramPacket msg,
  63            List<Object> out) throws Exception {
  64         LOG.debug("OFDatagramPacketFramer");
  65         MessageConsumer consumer = UdpConnectionMap.getMessageConsumer(msg.sender());
  66         if (consumer == null) {
  67             ConnectionFacade connectionFacade =
  68                     adapterFactory.createConnectionFacade(ctx.channel(), msg.sender(), false,
  69                             channelOutboundQueueSize);
  70             connectionHandler.onSwitchConnected(connectionFacade);
  71             connectionFacade.checkListeners();
  72             UdpConnectionMap.addConnection(msg.sender(), connectionFacade);
  73         }
  74         ByteBuf bb = msg.content();
  75         int readableBytes = bb.readableBytes();
  76         if (readableBytes < LENGTH_OF_HEADER) {
  77             if (LOG.isDebugEnabled()) {
  78                 LOG.debug("skipping bytebuf - too few bytes for header: {} < {}", readableBytes, LENGTH_OF_HEADER);
  79                 LOG.debug("bb: {}", ByteBufUtils.byteBufToHexString(bb));
  80             }
  81             return;
  82         }
  83
  84         int length = bb.getUnsignedShort(bb.readerIndex() + LENGTH_INDEX_IN_HEADER);
  85         LOG.debug("length of actual message: {}", length);
  86
  87         if (readableBytes < length) {
  88             if (LOG.isDebugEnabled()) {
  89                 LOG.debug("skipping bytebuf - too few bytes for msg: {} < {}", readableBytes, length);
  90                 LOG.debug("bytebuffer: {}", ByteBufUtils.byteBufToHexString(bb));
  91             }
  92             return;
  93         }
  94         LOG.debug("OF Protocol message received, type:{}", bb.getByte(bb.readerIndex() + 1));
  95
  96
  97         byte version = bb.readByte();
  98         if (version == EncodeConstants.OF13_VERSION_ID || version == EncodeConstants.OF10_VERSION_ID) {
  99             LOG.debug("detected version: {}", version);
 100             ByteBuf messageBuffer = bb.slice();
 101             out.add(new VersionMessageUdpWrapper(version, messageBuffer, msg.sender()));
 102             messageBuffer.retain();
 103         } else {
 104             LOG.warn("detected version: {} - currently not supported", version);
 105         }
 106         bb.skipBytes(bb.readableBytes());
 107     }
 108 }