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.Sets;
16 import io.netty.channel.Channel;
17 import io.netty.channel.ChannelFuture;
18 import io.netty.channel.ChannelFutureListener;
19 import java.io.IOException;
20 import java.util.Date;
22 import java.util.concurrent.TimeUnit;
23 import javax.annotation.concurrent.GuardedBy;
24 import org.opendaylight.controller.config.yang.bgp.rib.impl.BgpSessionState;
25 import org.opendaylight.protocol.bgp.parser.AsNumberUtil;
26 import org.opendaylight.protocol.bgp.parser.BGPError;
27 import org.opendaylight.protocol.bgp.parser.BgpTableTypeImpl;
28 import org.opendaylight.protocol.bgp.rib.impl.spi.BGPPeerRegistry;
29 import org.opendaylight.protocol.bgp.rib.impl.spi.BGPSessionPreferences;
30 import org.opendaylight.protocol.bgp.rib.impl.spi.BGPSessionStatistics;
31 import org.opendaylight.protocol.bgp.rib.spi.BGPSession;
32 import org.opendaylight.protocol.bgp.rib.spi.BGPSessionListener;
33 import org.opendaylight.protocol.bgp.rib.spi.BGPTerminationReason;
34 import org.opendaylight.protocol.framework.AbstractProtocolSession;
35 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.AsNumber;
36 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv4Address;
37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Keepalive;
38 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.KeepaliveBuilder;
39 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Notify;
40 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.NotifyBuilder;
41 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Open;
42 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Update;
43 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.BgpParameters;
44 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.bgp.parameters.OptionalCapabilities;
45 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.bgp.parameters.optional.capabilities.CParameters;
46 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.BgpTableType;
47 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.open.bgp.parameters.optional.capabilities.c.parameters.MultiprotocolCase;
48 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.rib.TablesKey;
49 import org.opendaylight.yangtools.yang.binding.Notification;
50 import org.slf4j.Logger;
51 import org.slf4j.LoggerFactory;
54 public class BGPSessionImpl extends AbstractProtocolSession<Notification> implements BGPSession, BGPSessionStatistics {
56 private static final Logger LOG = LoggerFactory.getLogger(BGPSessionImpl.class);
58 private static final Notification KEEP_ALIVE = new KeepaliveBuilder().build();
60 private static final int KA_TO_DEADTIMER_RATIO = 3;
63 * Internal session state.
67 * The session object is created by the negotiator in OpenConfirm state. While in this state, the session object
68 * is half-alive, e.g. the timers are running, but the session is not completely up, e.g. it has not been
69 * announced to the listener. If the session is torn down in this state, we do not inform the listener.
73 * The session has been completely established.
77 * The session has been closed. It will not be resurrected.
83 * System.nanoTime value about when was sent the last message.
86 private long lastMessageSentAt;
89 * System.nanoTime value about when was received the last message
91 private long lastMessageReceivedAt;
93 private final BGPSessionListener listener;
95 private final BGPSynchronization sync;
97 private int kaCounter = 0;
99 private final Channel channel;
102 private State state = State.OPEN_CONFIRM;
104 private final Set<BgpTableType> tableTypes;
105 private final int holdTimerValue;
106 private final int keepAlive;
107 private final AsNumber asNumber;
108 private final Ipv4Address bgpId;
109 private final BGPPeerRegistry peerRegistry;
110 private final ChannelOutputLimiter limiter;
112 private BGPSessionStats sessionStats;
114 public BGPSessionImpl(final BGPSessionListener listener, final Channel channel, final Open remoteOpen, final BGPSessionPreferences localPreferences,
115 final BGPPeerRegistry peerRegitry) {
116 this(listener, channel, remoteOpen, localPreferences.getHoldTime(), peerRegitry);
117 this.sessionStats = new BGPSessionStats(remoteOpen, this.holdTimerValue, this.keepAlive, channel, Optional.of(localPreferences), this.tableTypes);
120 public BGPSessionImpl(final BGPSessionListener listener, final Channel channel, final Open remoteOpen, final int localHoldTimer,
121 final BGPPeerRegistry peerRegitry) {
122 this.listener = Preconditions.checkNotNull(listener);
123 this.channel = Preconditions.checkNotNull(channel);
124 this.limiter = new ChannelOutputLimiter(this);
125 this.holdTimerValue = (remoteOpen.getHoldTimer() < localHoldTimer) ? remoteOpen.getHoldTimer() : localHoldTimer;
126 LOG.info("BGP HoldTimer new value: {}", this.holdTimerValue);
127 this.keepAlive = this.holdTimerValue / KA_TO_DEADTIMER_RATIO;
128 this.asNumber = AsNumberUtil.advertizedAsNumber(remoteOpen);
129 this.peerRegistry = peerRegitry;
131 final Set<TablesKey> tts = Sets.newHashSet();
132 final Set<BgpTableType> tats = Sets.newHashSet();
133 if (remoteOpen.getBgpParameters() != null) {
134 for (final BgpParameters param : remoteOpen.getBgpParameters()) {
135 for (final OptionalCapabilities optCapa : param.getOptionalCapabilities()) {
136 final CParameters cp = optCapa.getCParameters();
137 if (cp instanceof MultiprotocolCase) {
138 final TablesKey tt = new TablesKey(((MultiprotocolCase) cp).getMultiprotocolCapability().getAfi(),
139 ((MultiprotocolCase) cp).getMultiprotocolCapability().getSafi());
140 LOG.trace("Added table type to sync {}", tt);
142 tats.add(new BgpTableTypeImpl(tt.getAfi(), tt.getSafi()));
148 this.sync = new BGPSynchronization(this, this.listener, tts);
149 this.tableTypes = tats;
151 if (this.holdTimerValue != 0) {
152 channel.eventLoop().schedule(new Runnable() {
157 }, this.holdTimerValue, TimeUnit.SECONDS);
159 channel.eventLoop().schedule(new Runnable() {
162 handleKeepaliveTimer();
164 }, this.keepAlive, TimeUnit.SECONDS);
166 this.bgpId = remoteOpen.getBgpIdentifier();
167 this.sessionStats = new BGPSessionStats(remoteOpen, this.holdTimerValue, this.keepAlive, channel, Optional.<BGPSessionPreferences>absent(),
172 public synchronized void close() {
173 LOG.info("Closing session: {}", this);
175 if (this.state != State.IDLE) {
176 this.writeAndFlush(new NotifyBuilder().setErrorCode(BGPError.CEASE.getCode()).setErrorSubcode(
177 BGPError.CEASE.getSubcode()).build());
179 this.channel.close();
180 this.state = State.IDLE;
185 * Handles incoming message based on their type.
187 * @param msg incoming message
190 public synchronized void handleMessage(final Notification msg) {
191 // Update last reception time
192 this.lastMessageReceivedAt = System.nanoTime();
193 this.sessionStats.updateReceivedMsgTotal();
195 if (msg instanceof Open) {
196 // Open messages should not be present here
197 this.terminate(BGPError.FSM_ERROR);
198 } else if (msg instanceof Notify) {
199 // Notifications are handled internally
200 LOG.info("Session closed because Notification message received: {} / {}", ((Notify) msg).getErrorCode(),
201 ((Notify) msg).getErrorSubcode());
202 this.closeWithoutMessage();
203 this.listener.onSessionTerminated(this, new BGPTerminationReason(BGPError.forValue(((Notify) msg).getErrorCode(),
204 ((Notify) msg).getErrorSubcode())));
205 this.sessionStats.updateReceivedMsgErr((Notify) msg);
206 } else if (msg instanceof Keepalive) {
207 // Keepalives are handled internally
208 LOG.trace("Received KeepAlive messsage.");
210 this.sessionStats.updateReceivedMsgKA();
211 if (this.kaCounter >= 2) {
212 this.sync.kaReceived();
215 // All others are passed up
216 this.listener.onMessage(this, msg);
217 this.sync.updReceived((Update) msg);
218 this.sessionStats.updateReceivedMsgUpd();
223 public synchronized void endOfInput() {
224 if (this.state == State.UP) {
225 this.listener.onSessionDown(this, new IOException("End of input detected. Close the session."));
230 private final void writeEpilogue(final ChannelFuture future, final Notification msg) {
232 new ChannelFutureListener() {
234 public void operationComplete(final ChannelFuture f) {
235 if (!f.isSuccess()) {
236 LOG.info("Failed to send message {} to socket {}", msg, f.cause(), BGPSessionImpl.this.channel);
238 LOG.trace("Message {} sent to socket {}", msg, BGPSessionImpl.this.channel);
242 this.lastMessageSentAt = System.nanoTime();
243 this.sessionStats.updateSentMsgTotal();
244 if (msg instanceof Update) {
245 this.sessionStats.updateSentMsgUpd();
246 } else if (msg instanceof Notify) {
247 this.sessionStats.updateSentMsgErr((Notify) msg);
252 this.channel.flush();
255 synchronized void write(final Notification msg) {
257 writeEpilogue(this.channel.write(msg), msg);
258 } catch (final Exception e) {
259 LOG.warn("Message {} was not sent.", msg, e);
263 synchronized void writeAndFlush(final Notification msg) {
264 writeEpilogue(this.channel.writeAndFlush(msg), msg);
267 private synchronized void closeWithoutMessage() {
268 LOG.debug("Closing session: {}", this);
270 this.channel.close();
271 this.state = State.IDLE;
275 * Closes PCEP session from the parent with given reason. A message needs to be sent, but parent doesn't have to be
276 * modified, because he initiated the closing. (To prevent concurrent modification exception).
280 private void terminate(final BGPError error) {
281 this.writeAndFlush(new NotifyBuilder().setErrorCode(error.getCode()).setErrorSubcode(error.getSubcode()).build());
282 this.closeWithoutMessage();
284 this.listener.onSessionTerminated(this, new BGPTerminationReason(error));
287 private void removePeerSession() {
288 if (this.peerRegistry != null) {
289 this.peerRegistry.removePeerSession(StrictBGPPeerRegistry.getIpAddress(this.channel.remoteAddress()));
294 * If HoldTimer expires, the session ends. If a message (whichever) was received during this period, the HoldTimer
295 * will be rescheduled by HOLD_TIMER_VALUE + the time that has passed from the start of the HoldTimer to the time at
296 * which the message was received. If the session was closed by the time this method starts to execute (the session
297 * state will become IDLE), then rescheduling won't occur.
299 private synchronized void handleHoldTimer() {
300 if (this.state == State.IDLE) {
304 final long ct = System.nanoTime();
305 final long nextHold = this.lastMessageReceivedAt + TimeUnit.SECONDS.toNanos(this.holdTimerValue);
307 if (ct >= nextHold) {
308 LOG.debug("HoldTimer expired. {}", new Date());
309 this.terminate(BGPError.HOLD_TIMER_EXPIRED);
311 this.channel.eventLoop().schedule(new Runnable() {
316 }, nextHold - ct, TimeUnit.NANOSECONDS);
321 * If KeepAlive Timer expires, sends KeepAlive message. If a message (whichever) was send during this period, the
322 * KeepAlive Timer will be rescheduled by KEEP_ALIVE_TIMER_VALUE + the time that has passed from the start of the
323 * KeepAlive timer to the time at which the message was sent. If the session was closed by the time this method
324 * starts to execute (the session state will become IDLE), that rescheduling won't occur.
326 private synchronized void handleKeepaliveTimer() {
327 if (this.state == State.IDLE) {
331 final long ct = System.nanoTime();
332 long nextKeepalive = this.lastMessageSentAt + TimeUnit.SECONDS.toNanos(this.keepAlive);
334 if (ct >= nextKeepalive) {
335 this.writeAndFlush(KEEP_ALIVE);
336 nextKeepalive = this.lastMessageSentAt + TimeUnit.SECONDS.toNanos(this.keepAlive);
337 this.sessionStats.updateSentMsgKA();
339 this.channel.eventLoop().schedule(new Runnable() {
342 handleKeepaliveTimer();
344 }, nextKeepalive - ct, TimeUnit.NANOSECONDS);
348 public final String toString() {
349 return addToStringAttributes(MoreObjects.toStringHelper(this)).toString();
352 protected ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
353 toStringHelper.add("channel", this.channel);
354 toStringHelper.add("state", this.getState());
355 return toStringHelper;
359 public Set<BgpTableType> getAdvertisedTableTypes() {
360 return this.tableTypes;
364 protected synchronized void sessionUp() {
365 this.sessionStats.startSessionStopwatch();
366 this.state = State.UP;
367 this.listener.onSessionUp(this);
370 public synchronized State getState() {
375 public final Ipv4Address getBgpId() {
380 public final AsNumber getAsNumber() {
381 return this.asNumber;
384 synchronized boolean isWritable() {
385 return this.channel != null && this.channel.isWritable();
388 void schedule(final Runnable task) {
389 Preconditions.checkState(this.channel != null);
390 this.channel.eventLoop().submit(task);
394 protected synchronized void setLastMessageSentAt(final long lastMessageSentAt) {
395 this.lastMessageSentAt = lastMessageSentAt;
399 public synchronized BgpSessionState getBgpSesionState() {
400 return this.sessionStats.getBgpSessionState(this.state);
404 public synchronized void resetSessionStats() {
405 this.sessionStats.resetStats();
408 ChannelOutputLimiter getLimiter() {