2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
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
8 package org.opendaylight.protocol.bgp.rib.impl;
10 import com.google.common.annotations.VisibleForTesting;
11 import com.google.common.base.MoreObjects;
12 import com.google.common.base.MoreObjects.ToStringHelper;
13 import com.google.common.base.Optional;
14 import com.google.common.base.Preconditions;
15 import com.google.common.collect.Lists;
16 import com.google.common.collect.Sets;
17 import io.netty.buffer.ByteBufUtil;
18 import io.netty.channel.Channel;
19 import io.netty.channel.ChannelFuture;
20 import io.netty.channel.ChannelFutureListener;
21 import io.netty.channel.ChannelHandlerContext;
22 import io.netty.channel.ChannelPipeline;
23 import io.netty.channel.SimpleChannelInboundHandler;
24 import java.io.IOException;
25 import java.nio.channels.NonWritableChannelException;
26 import java.util.Date;
27 import java.util.List;
29 import java.util.concurrent.TimeUnit;
30 import javax.annotation.concurrent.GuardedBy;
31 import org.opendaylight.controller.config.yang.bgp.rib.impl.BgpSessionState;
32 import org.opendaylight.protocol.bgp.parser.AsNumberUtil;
33 import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
34 import org.opendaylight.protocol.bgp.parser.BGPError;
35 import org.opendaylight.protocol.bgp.parser.BgpExtendedMessageUtil;
36 import org.opendaylight.protocol.bgp.parser.BgpTableTypeImpl;
37 import org.opendaylight.protocol.bgp.parser.spi.MultiPathSupport;
38 import org.opendaylight.protocol.bgp.parser.spi.pojo.MultiPathSupportImpl;
39 import org.opendaylight.protocol.bgp.rib.impl.spi.BGPPeerRegistry;
40 import org.opendaylight.protocol.bgp.rib.impl.spi.BGPSessionPreferences;
41 import org.opendaylight.protocol.bgp.rib.impl.stats.peer.BGPSessionStats;
42 import org.opendaylight.protocol.bgp.rib.impl.stats.peer.BGPSessionStatsImpl;
43 import org.opendaylight.protocol.bgp.rib.spi.BGPSession;
44 import org.opendaylight.protocol.bgp.rib.spi.BGPSessionListener;
45 import org.opendaylight.protocol.bgp.rib.spi.BGPTerminationReason;
46 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.AsNumber;
47 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Address;
48 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Keepalive;
49 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.KeepaliveBuilder;
50 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Notify;
51 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.NotifyBuilder;
52 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Open;
53 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Update;
54 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.message.BgpParameters;
55 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.message.bgp.parameters.OptionalCapabilities;
56 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.message.bgp.parameters.optional.capabilities.CParameters;
57 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.BgpTableType;
58 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.CParameters1;
59 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.RouteRefresh;
60 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.mp.capabilities.AddPathCapability;
61 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.mp.capabilities.MultiprotocolCapability;
62 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.mp.capabilities.add.path.capability.AddressFamilies;
63 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.rib.TablesKey;
64 import org.opendaylight.yangtools.yang.binding.Notification;
65 import org.slf4j.Logger;
66 import org.slf4j.LoggerFactory;
69 public class BGPSessionImpl extends SimpleChannelInboundHandler<Notification> implements BGPSession, BGPSessionStats, AutoCloseable {
71 private static final Logger LOG = LoggerFactory.getLogger(BGPSessionImpl.class);
73 private static final Notification KEEP_ALIVE = new KeepaliveBuilder().build();
75 private static final int KA_TO_DEADTIMER_RATIO = 3;
77 private static final String EXTENDED_MSG_DECODER = "EXTENDED_MSG_DECODER";
79 static final String END_OF_INPUT = "End of input detected. Close the session.";
82 * Internal session state.
86 * The session object is created by the negotiator in OpenConfirm state. While in this state, the session object
87 * is half-alive, e.g. the timers are running, but the session is not completely up, e.g. it has not been
88 * announced to the listener. If the session is torn down in this state, we do not inform the listener.
92 * The session has been completely established.
96 * The session has been closed. It will not be resurrected.
102 * System.nanoTime value about when was sent the last message.
105 private long lastMessageSentAt;
108 * System.nanoTime value about when was received the last message
110 private long lastMessageReceivedAt;
112 private final BGPSessionListener listener;
114 private final BGPSynchronization sync;
116 private int kaCounter = 0;
118 private final Channel channel;
121 private State state = State.OPEN_CONFIRM;
123 private final Set<BgpTableType> tableTypes;
124 private final List<AddressFamilies> addPathTypes;
125 private final int holdTimerValue;
126 private final int keepAlive;
127 private final AsNumber asNumber;
128 private final Ipv4Address bgpId;
129 private final BGPPeerRegistry peerRegistry;
130 private final ChannelOutputLimiter limiter;
132 private BGPSessionStatsImpl sessionStats;
134 public BGPSessionImpl(final BGPSessionListener listener, final Channel channel, final Open remoteOpen, final BGPSessionPreferences localPreferences,
135 final BGPPeerRegistry peerRegistry) {
136 this(listener, channel, remoteOpen, localPreferences.getHoldTime(), peerRegistry);
137 this.sessionStats = new BGPSessionStatsImpl(this, remoteOpen, this.holdTimerValue, this.keepAlive, channel, Optional.of(localPreferences), this.tableTypes, this.addPathTypes);
140 public BGPSessionImpl(final BGPSessionListener listener, final Channel channel, final Open remoteOpen, final int localHoldTimer,
141 final BGPPeerRegistry peerRegistry) {
142 this.listener = Preconditions.checkNotNull(listener);
143 this.channel = Preconditions.checkNotNull(channel);
144 this.limiter = new ChannelOutputLimiter(this);
145 this.channel.pipeline().addLast(this.limiter);
146 this.holdTimerValue = (remoteOpen.getHoldTimer() < localHoldTimer) ? remoteOpen.getHoldTimer() : localHoldTimer;
147 LOG.info("BGP HoldTimer new value: {}", this.holdTimerValue);
148 this.keepAlive = this.holdTimerValue / KA_TO_DEADTIMER_RATIO;
149 this.asNumber = AsNumberUtil.advertizedAsNumber(remoteOpen);
150 this.peerRegistry = peerRegistry;
152 final Set<TablesKey> tts = Sets.newHashSet();
153 final Set<BgpTableType> tats = Sets.newHashSet();
154 final List<AddressFamilies> addPathCapabilitiesList = Lists.newArrayList();
155 if (remoteOpen.getBgpParameters() != null) {
156 for (final BgpParameters param : remoteOpen.getBgpParameters()) {
157 for (final OptionalCapabilities optCapa : param.getOptionalCapabilities()) {
158 final CParameters cParam = optCapa.getCParameters();
159 if ( cParam.getAugmentation(CParameters1.class) == null) {
162 if(cParam.getAugmentation(CParameters1.class).getMultiprotocolCapability() != null) {
163 final MultiprotocolCapability multi = cParam.getAugmentation(CParameters1.class).getMultiprotocolCapability();
164 final TablesKey tt = new TablesKey(multi.getAfi(), multi.getSafi());
165 LOG.trace("Added table type to sync {}", tt);
167 tats.add(new BgpTableTypeImpl(tt.getAfi(), tt.getSafi()));
168 } else if (cParam.getAugmentation(CParameters1.class).getAddPathCapability() != null) {
169 final AddPathCapability addPathCap = cParam.getAugmentation(CParameters1.class).getAddPathCapability();
170 addPathCapabilitiesList.addAll(addPathCap.getAddressFamilies());
176 this.sync = new BGPSynchronization(this.listener, tts);
177 this.tableTypes = tats;
178 this.addPathTypes = addPathCapabilitiesList;
180 if (! this.addPathTypes.isEmpty()) {
181 final ChannelPipeline pipeline = this.channel.pipeline();
182 final BGPByteToMessageDecoder decoder = pipeline.get(BGPByteToMessageDecoder.class);
183 decoder.addDecoderConstraint(MultiPathSupport.class,
184 MultiPathSupportImpl.createParserMultiPathSupport(this.addPathTypes));
187 if (this.holdTimerValue != 0) {
188 channel.eventLoop().schedule(new Runnable() {
193 }, this.holdTimerValue, TimeUnit.SECONDS);
195 channel.eventLoop().schedule(new Runnable() {
198 handleKeepaliveTimer();
200 }, this.keepAlive, TimeUnit.SECONDS);
202 this.bgpId = remoteOpen.getBgpIdentifier();
203 this.sessionStats = new BGPSessionStatsImpl(this, remoteOpen, this.holdTimerValue, this.keepAlive, channel, Optional.<BGPSessionPreferences>absent(),
204 this.tableTypes, this.addPathTypes);
208 * Set the extend message coder for current channel
209 * The reason for separating this part from constructor is, in #channel.pipeline().replace(..), the
210 * invokeChannelRead() will be invoked after the original message coder handler got removed. And there
211 * is chance that before the session instance is fully initiated (constructor returns), a KeepAlive
212 * message arrived already in the channel buffer. Thus #AbstractBGPSessionNegotiator.handleMessage(..)
213 * gets invoked again and a deadlock is caused. A BGP final state machine error will happen as BGP
214 * negotiator is still in OPEN_SENT state as the session constructor hasn't returned yet.
218 public synchronized void setChannelExtMsgCoder(final Open remoteOpen) {
219 final boolean enableExMess = BgpExtendedMessageUtil.advertizedBgpExtendedMessageCapability(remoteOpen);
221 this.channel.pipeline().replace(BGPMessageHeaderDecoder.class, EXTENDED_MSG_DECODER, BGPMessageHeaderDecoder.getExtendedBGPMessageHeaderDecoder());
226 public synchronized void close() {
227 if (this.state != State.IDLE) {
228 this.writeAndFlush(new NotifyBuilder().setErrorCode(BGPError.CEASE.getCode()).setErrorSubcode(BGPError.CEASE.getSubcode()).build());
229 this.closeWithoutMessage();
234 * Handles incoming message based on their type.
236 * @param msg incoming message
238 synchronized void handleMessage(final Notification msg) throws BGPDocumentedException {
239 // Update last reception time
240 this.lastMessageReceivedAt = System.nanoTime();
242 if (msg instanceof Open) {
243 // Open messages should not be present here
244 this.terminate(new BGPDocumentedException(null, BGPError.FSM_ERROR));
245 } else if (msg instanceof Notify) {
246 final Notify notify = (Notify) msg;
247 // Notifications are handled internally
248 LOG.info("Session closed because Notification message received: {} / {}, data={}", notify.getErrorCode(),
249 notify.getErrorSubcode(), notify.getData() != null ? ByteBufUtil.hexDump(notify.getData()) : null);
250 this.closeWithoutMessage();
251 this.listener.onSessionTerminated(this, new BGPTerminationReason(
252 BGPError.forValue(notify.getErrorCode(), notify.getErrorSubcode())));
253 } else if (msg instanceof Keepalive) {
254 // Keepalives are handled internally
255 LOG.trace("Received KeepAlive message.");
257 if (this.kaCounter >= 2) {
258 this.sync.kaReceived();
260 } else if (msg instanceof RouteRefresh) {
261 this.listener.onMessage(this, msg);
262 } else if (msg instanceof Update) {
263 this.listener.onMessage(this, msg);
264 this.sync.updReceived((Update) msg);
266 LOG.warn("Ignoring unhandled message: {}.", msg.getClass());
269 this.sessionStats.updateReceivedMsg(msg);
272 synchronized void endOfInput() {
273 if (this.state == State.UP) {
274 LOG.info(END_OF_INPUT);
275 this.listener.onSessionDown(this, new IOException(END_OF_INPUT));
280 private ChannelFuture writeEpilogue(final ChannelFuture future, final Notification msg) {
282 new ChannelFutureListener() {
284 public void operationComplete(final ChannelFuture f) {
285 if (!f.isSuccess()) {
286 LOG.warn("Failed to send message {} to socket {}", msg, BGPSessionImpl.this.channel, f.cause());
288 LOG.trace("Message {} sent to socket {}", msg, BGPSessionImpl.this.channel);
292 this.lastMessageSentAt = System.nanoTime();
293 this.sessionStats.updateSentMsg(msg);
298 this.channel.flush();
301 synchronized void write(final Notification msg) {
303 writeEpilogue(this.channel.write(msg), msg);
304 } catch (final Exception e) {
305 LOG.warn("Message {} was not sent.", msg, e);
309 synchronized ChannelFuture writeAndFlush(final Notification msg) {
311 return writeEpilogue(this.channel.writeAndFlush(msg), msg);
313 return this.channel.newFailedFuture(new NonWritableChannelException());
316 private synchronized void closeWithoutMessage() {
317 if (this.state == State.IDLE) {
320 LOG.info("Closing session: {}", this);
322 this.channel.close().addListener(new ChannelFutureListener() {
324 public void operationComplete(final ChannelFuture future) throws Exception {
325 Preconditions.checkArgument(future.isSuccess(), "Channel failed to close: %s", future.cause());
328 this.state = State.IDLE;
332 * Closes BGP session from the parent with given reason. A message needs to be sent, but parent doesn't have to be
333 * modified, because he initiated the closing. (To prevent concurrent modification exception).
335 * @param e BGPDocumentedException
337 private synchronized void terminate(final BGPDocumentedException e) {
338 final BGPError error = e.getError();
339 final byte[] data = e.getData();
340 final NotifyBuilder builder = new NotifyBuilder().setErrorCode(error.getCode()).setErrorSubcode(error.getSubcode());
341 if (data != null && data.length != 0) {
342 builder.setData(data);
344 this.writeAndFlush(builder.build());
345 this.closeWithoutMessage();
347 this.listener.onSessionTerminated(this, new BGPTerminationReason(error));
350 private void removePeerSession() {
351 if (this.peerRegistry != null) {
352 this.peerRegistry.removePeerSession(StrictBGPPeerRegistry.getIpAddress(this.channel.remoteAddress()));
357 * If HoldTimer expires, the session ends. If a message (whichever) was received during this period, the HoldTimer
358 * will be rescheduled by HOLD_TIMER_VALUE + the time that has passed from the start of the HoldTimer to the time at
359 * which the message was received. If the session was closed by the time this method starts to execute (the session
360 * state will become IDLE), then rescheduling won't occur.
362 private synchronized void handleHoldTimer() {
363 if (this.state == State.IDLE) {
367 final long ct = System.nanoTime();
368 final long nextHold = this.lastMessageReceivedAt + TimeUnit.SECONDS.toNanos(this.holdTimerValue);
370 if (ct >= nextHold) {
371 LOG.debug("HoldTimer expired. {}", new Date());
372 this.terminate(new BGPDocumentedException(BGPError.HOLD_TIMER_EXPIRED));
374 this.channel.eventLoop().schedule(new Runnable() {
379 }, nextHold - ct, TimeUnit.NANOSECONDS);
384 * If KeepAlive Timer expires, sends KeepAlive message. If a message (whichever) was send during this period, the
385 * KeepAlive Timer will be rescheduled by KEEP_ALIVE_TIMER_VALUE + the time that has passed from the start of the
386 * KeepAlive timer to the time at which the message was sent. If the session was closed by the time this method
387 * starts to execute (the session state will become IDLE), that rescheduling won't occur.
389 private synchronized void handleKeepaliveTimer() {
390 if (this.state == State.IDLE) {
394 final long ct = System.nanoTime();
395 long nextKeepalive = this.lastMessageSentAt + TimeUnit.SECONDS.toNanos(this.keepAlive);
397 if (ct >= nextKeepalive) {
398 this.writeAndFlush(KEEP_ALIVE);
399 nextKeepalive = this.lastMessageSentAt + TimeUnit.SECONDS.toNanos(this.keepAlive);
400 this.sessionStats.updateSentMsgKA();
402 this.channel.eventLoop().schedule(new Runnable() {
405 handleKeepaliveTimer();
407 }, nextKeepalive - ct, TimeUnit.NANOSECONDS);
411 public final String toString() {
412 return addToStringAttributes(MoreObjects.toStringHelper(this)).toString();
415 protected ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
416 toStringHelper.add("channel", this.channel);
417 toStringHelper.add("state", this.getState());
418 return toStringHelper;
422 public Set<BgpTableType> getAdvertisedTableTypes() {
423 return this.tableTypes;
427 public List<AddressFamilies> getAdvertisedAddPathTableTypes() {
428 return this.addPathTypes;
431 protected synchronized void sessionUp() {
432 this.sessionStats.startSessionStopwatch();
433 this.state = State.UP;
434 this.listener.onSessionUp(this);
437 public synchronized State getState() {
442 public final Ipv4Address getBgpId() {
447 public final AsNumber getAsNumber() {
448 return this.asNumber;
451 synchronized boolean isWritable() {
452 return this.channel != null && this.channel.isWritable();
456 public synchronized BgpSessionState getBgpSessionState() {
457 return this.sessionStats.getBgpSessionState();
461 public synchronized void resetBgpSessionStats() {
462 this.sessionStats.resetBgpSessionStats();
465 public ChannelOutputLimiter getLimiter() {
470 public final void channelInactive(final ChannelHandlerContext ctx) {
471 LOG.debug("Channel {} inactive.", ctx.channel());
475 super.channelInactive(ctx);
476 } catch (final Exception e) {
477 throw new IllegalStateException("Failed to delegate channel inactive event on channel " + ctx.channel(), e);
482 protected final void channelRead0(final ChannelHandlerContext ctx, final Notification msg) {
483 LOG.debug("Message was received: {}", msg);
485 this.handleMessage(msg);
486 } catch (final BGPDocumentedException e) {
492 public final void handlerAdded(final ChannelHandlerContext ctx) {
497 public void exceptionCaught(final ChannelHandlerContext ctx, final Throwable cause) {
498 LOG.warn("BGP session encountered error", cause);
499 if (cause.getCause() instanceof BGPDocumentedException) {
500 this.terminate((BGPDocumentedException) cause.getCause());