/* * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved. * * This program and the accompanying materials are made available under the * terms of the Eclipse Public License v1.0 which accompanies this distribution, * and is available at http://www.eclipse.org/legal/epl-v10.html */ package org.opendaylight.protocol.bgp.rib.impl; import com.google.common.base.Preconditions; import io.netty.bootstrap.Bootstrap; import io.netty.bootstrap.ServerBootstrap; import io.netty.buffer.PooledByteBufAllocator; import io.netty.channel.ChannelFuture; import io.netty.channel.ChannelHandler; import io.netty.channel.ChannelInitializer; import io.netty.channel.ChannelOption; import io.netty.channel.EventLoopGroup; import io.netty.channel.socket.SocketChannel; import io.netty.channel.socket.nio.NioServerSocketChannel; import io.netty.channel.socket.nio.NioSocketChannel; import io.netty.util.concurrent.DefaultPromise; import io.netty.util.concurrent.EventExecutor; import io.netty.util.concurrent.Future; import io.netty.util.concurrent.GlobalEventExecutor; import io.netty.util.concurrent.Promise; import java.net.InetSocketAddress; import org.opendaylight.protocol.bgp.parser.spi.MessageRegistry; import org.opendaylight.protocol.bgp.rib.impl.protocol.BGPProtocolSessionPromise; import org.opendaylight.protocol.bgp.rib.impl.protocol.BGPReconnectPromise; import org.opendaylight.protocol.bgp.rib.impl.spi.BGPDispatcher; import org.opendaylight.protocol.bgp.rib.impl.spi.BGPPeerRegistry; import org.opendaylight.protocol.bgp.rib.impl.spi.BGPSessionValidator; import org.opendaylight.protocol.bgp.rib.impl.spi.ChannelPipelineInitializer; import org.opendaylight.protocol.bgp.rib.spi.BGPSession; import org.opendaylight.protocol.bgp.rib.spi.BGPSessionNegotiatorFactory; import org.opendaylight.protocol.framework.ReconnectStrategy; import org.opendaylight.protocol.framework.ReconnectStrategyFactory; import org.opendaylight.tcpmd5.api.KeyMapping; import org.opendaylight.tcpmd5.netty.MD5ChannelFactory; import org.opendaylight.tcpmd5.netty.MD5ChannelOption; import org.opendaylight.tcpmd5.netty.MD5ServerChannelFactory; import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.AsNumber; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * Implementation of BGPDispatcher. */ public class BGPDispatcherImpl implements BGPDispatcher, AutoCloseable { private static final Logger LOG = LoggerFactory.getLogger(BGPDispatcherImpl.class); private static final int SOCKET_BACKLOG_SIZE = 128; private final MD5ServerChannelFactory scf; private final MD5ChannelFactory cf; private final BGPHandlerFactory hf; private final EventLoopGroup bossGroup; private final EventLoopGroup workerGroup; private final EventExecutor executor; private KeyMapping keys; public BGPDispatcherImpl(final MessageRegistry messageRegistry, final EventLoopGroup bossGroup, final EventLoopGroup workerGroup) { this(messageRegistry, bossGroup, workerGroup, null, null); } public BGPDispatcherImpl(final MessageRegistry messageRegistry, final EventLoopGroup bossGroup, final EventLoopGroup workerGroup, final MD5ChannelFactory cf, final MD5ServerChannelFactory scf) { this.bossGroup = Preconditions.checkNotNull(bossGroup); this.workerGroup = Preconditions.checkNotNull(workerGroup); this.executor = Preconditions.checkNotNull(GlobalEventExecutor.INSTANCE); this.hf = new BGPHandlerFactory(messageRegistry); this.cf = cf; this.scf = scf; this.keys = null; } @Override public synchronized Future createClient(final InetSocketAddress address, final AsNumber remoteAs, final BGPPeerRegistry listener, final ReconnectStrategy strategy) { final BGPClientSessionNegotiatorFactory snf = new BGPClientSessionNegotiatorFactory(remoteAs, listener); final ChannelPipelineInitializer initializer = BGPChannel.createChannelPipelineInitializer (BGPDispatcherImpl.this.hf.getDecoders(), snf, BGPDispatcherImpl.this.hf.getEncoders()); final Bootstrap b = new Bootstrap(); final BGPProtocolSessionPromise p = new BGPProtocolSessionPromise(this.executor, address, strategy, b); b.option(ChannelOption.SO_KEEPALIVE, Boolean.TRUE); b.handler(BGPChannel.createChannelInitializer(initializer, p)); this.customizeBootstrap(b); setWorkerGroup(b); p.connect(); LOG.debug("Client created."); return p; } @Override public void close() { try { this.workerGroup.shutdownGracefully(); } finally { this.bossGroup.shutdownGracefully(); } } @Override public synchronized Future createReconnectingClient(final InetSocketAddress address, final AsNumber remoteAs, final BGPPeerRegistry peerRegistry, final ReconnectStrategyFactory connectStrategyFactory, final KeyMapping keys) { final BGPClientSessionNegotiatorFactory snf = new BGPClientSessionNegotiatorFactory(remoteAs, peerRegistry); this.keys = keys; final Bootstrap b = new Bootstrap(); final BGPReconnectPromise p = new BGPReconnectPromise(GlobalEventExecutor.INSTANCE, address, connectStrategyFactory, b, BGPChannel.createChannelPipelineInitializer(BGPDispatcherImpl.this.hf.getDecoders(), snf, BGPDispatcherImpl.this.hf.getEncoders())); b.option(ChannelOption.SO_KEEPALIVE, Boolean.TRUE); this.customizeBootstrap(b); setWorkerGroup(b); p.connect(); this.keys = null; return p; } @Override public ChannelFuture createServer(final BGPPeerRegistry registry, final InetSocketAddress address, final BGPSessionValidator sessionValidator) { final BGPServerSessionNegotiatorFactory snf = new BGPServerSessionNegotiatorFactory(sessionValidator, registry); final ChannelPipelineInitializer initializer = BGPChannel.createChannelPipelineInitializer (BGPDispatcherImpl.this.hf.getDecoders(), snf, BGPDispatcherImpl.this.hf.getEncoders()); final ServerBootstrap b = new ServerBootstrap(); b.childHandler(BGPChannel.createChannelInitializer(initializer, new DefaultPromise(BGPDispatcherImpl.this.executor))); b.option(ChannelOption.SO_BACKLOG, Integer.valueOf(SOCKET_BACKLOG_SIZE)); b.childOption(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT); this.customizeBootstrap(b); final ChannelFuture f = b.bind(address); LOG.debug("Initiated server {} at {}.", f, address); return f; } protected void customizeBootstrap(final Bootstrap b) { if (this.keys != null && !this.keys.isEmpty()) { if (this.cf == null) { throw new UnsupportedOperationException("No key access instance available, cannot use key mapping"); } b.channelFactory(this.cf); b.option(MD5ChannelOption.TCP_MD5SIG, this.keys); } // Make sure we are doing round-robin processing b.option(ChannelOption.MAX_MESSAGES_PER_READ, 1); } private void customizeBootstrap(final ServerBootstrap b) { if (this.keys != null && !this.keys.isEmpty()) { if (this.scf == null) { throw new UnsupportedOperationException("No key access instance available, cannot use key mapping"); } b.channelFactory(this.scf); b.option(MD5ChannelOption.TCP_MD5SIG, this.keys); } // Make sure we are doing round-robin processing b.option(ChannelOption.MAX_MESSAGES_PER_READ, 1); if (b.group() == null) { b.group(this.bossGroup, this.workerGroup); } try { b.channel(NioServerSocketChannel.class); } catch (final IllegalStateException e) { LOG.trace("Not overriding channelFactory on bootstrap {}", b, e); } } private void setWorkerGroup(final Bootstrap b) { if (b.group() == null) { b.group(this.workerGroup); } try { b.channel(NioSocketChannel.class); } catch (final IllegalStateException e) { LOG.trace("Not overriding channelFactory on bootstrap {}", b, e); } } private static final class BGPChannel { private static final String NEGOTIATOR = "negotiator"; private BGPChannel() { } public static ChannelPipelineInitializer createChannelPipelineInitializer(final ChannelHandler[] channelDecoder, final T snf, final ChannelHandler[] channelEncoder) { return new ChannelPipelineInitializer() { @Override public void initializeChannel(final SocketChannel ch, final Promise promise) { ch.pipeline().addLast(channelDecoder); ch.pipeline().addLast(NEGOTIATOR, snf.getSessionNegotiator(ch, promise)); ch.pipeline().addLast(channelEncoder); } }; } public static ChannelHandler createChannelInitializer(final ChannelPipelineInitializer initializer, final Promise promise) { return new ChannelInitializer() { @Override protected void initChannel(final SocketChannel ch) { initializer.initializeChannel(ch, promise); } }; } } }