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 io.netty.channel.Channel;
11 import io.netty.util.Timeout;
12 import io.netty.util.Timer;
13 import io.netty.util.TimerTask;
15 import java.io.IOException;
16 import java.util.Date;
18 import java.util.concurrent.TimeUnit;
20 import javax.annotation.concurrent.GuardedBy;
22 import org.opendaylight.protocol.bgp.parser.AsNumberUtil;
23 import org.opendaylight.protocol.bgp.parser.BGPError;
24 import org.opendaylight.protocol.bgp.parser.BGPSession;
25 import org.opendaylight.protocol.bgp.parser.BGPSessionListener;
26 import org.opendaylight.protocol.bgp.parser.BGPTerminationReason;
27 import org.opendaylight.protocol.bgp.parser.BgpTableTypeImpl;
28 import org.opendaylight.protocol.framework.AbstractProtocolSession;
29 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.AsNumber;
30 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv4Address;
31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Keepalive;
32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.KeepaliveBuilder;
33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Notify;
34 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.NotifyBuilder;
35 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Open;
36 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Update;
37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.BgpParameters;
38 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.bgp.parameters.CParameters;
39 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.BgpTableType;
40 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.open.bgp.parameters.c.parameters.MultiprotocolCase;
41 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.rib.TablesKey;
42 import org.opendaylight.yangtools.yang.binding.Notification;
43 import org.slf4j.Logger;
44 import org.slf4j.LoggerFactory;
46 import com.google.common.annotations.VisibleForTesting;
47 import com.google.common.base.Objects;
48 import com.google.common.base.Objects.ToStringHelper;
49 import com.google.common.base.Preconditions;
50 import com.google.common.collect.Sets;
53 public class BGPSessionImpl extends AbstractProtocolSession<Notification> implements BGPSession {
55 private static final Logger LOG = LoggerFactory.getLogger(BGPSessionImpl.class);
60 private static final int DEFAULT_HOLD_TIMER_VALUE = 15;
62 private static final Notification KEEP_ALIVE = new KeepaliveBuilder().build();
65 * Internal session state.
69 * The session object is created by the negotiator in OpenConfirm state. While in this state, the session object
70 * is half-alive, e.g. the timers are running, but the session is not completely up, e.g. it has not been
71 * announced to the listener. If the session is torn down in this state, we do not inform the listener.
75 * The session has been completely established.
79 * The session has been closed. It will not be resurrected.
85 * System.nanoTime value about when was sent the last message Protected to be updated also in tests.
88 protected long lastMessageSentAt;
91 * System.nanoTime value about when was received the last message
93 private long lastMessageReceivedAt;
95 private final BGPSessionListener listener;
98 * Timer object grouping FSM Timers
100 private final Timer stateTimer;
102 private final BGPSynchronization sync;
104 private int kaCounter = 0;
106 private final Channel channel;
109 private State state = State.OpenConfirm;
112 private final Set<BgpTableType> tableTypes;
113 private final int holdTimerValue;
114 private final int keepAlive;
115 private final AsNumber asNumber;
116 private final Ipv4Address bgpId;
118 BGPSessionImpl(final Timer timer, final BGPSessionListener listener, final Channel channel, final Open remoteOpen, final int localHoldTimer) {
119 this.listener = Preconditions.checkNotNull(listener);
120 this.stateTimer = Preconditions.checkNotNull(timer);
121 this.channel = Preconditions.checkNotNull(channel);
122 this.holdTimerValue = (remoteOpen.getHoldTimer() < localHoldTimer) ? remoteOpen.getHoldTimer() : localHoldTimer;
123 LOG.info("HoldTimer new value: {}", this.holdTimerValue);
124 this.keepAlive = this.holdTimerValue / 3;
125 this.asNumber = AsNumberUtil.advertizedAsNumber(remoteOpen);
127 final Set<TablesKey> tts = Sets.newHashSet();
128 final Set<BgpTableType> tats = Sets.newHashSet();
129 if (remoteOpen.getBgpParameters() != null) {
130 for (final BgpParameters param : remoteOpen.getBgpParameters()) {
131 final CParameters cp = param.getCParameters();
132 if (cp instanceof MultiprotocolCase) {
133 final TablesKey tt = new TablesKey(((MultiprotocolCase) cp).getMultiprotocolCapability().getAfi(), ((MultiprotocolCase) cp).getMultiprotocolCapability().getSafi());
134 LOG.trace("Added table type to sync {}", tt);
136 tats.add(new BgpTableTypeImpl(tt.getAfi(), tt.getSafi()));
141 this.sync = new BGPSynchronization(this, this.listener, tts);
142 this.tableTypes = tats;
144 if (this.holdTimerValue != 0) {
145 this.stateTimer.newTimeout(new TimerTask() {
148 public void run(final Timeout timeout) throws Exception {
151 }, this.holdTimerValue, TimeUnit.SECONDS);
153 this.stateTimer.newTimeout(new TimerTask() {
155 public void run(final Timeout timeout) throws Exception {
156 handleKeepaliveTimer();
158 }, this.keepAlive, TimeUnit.SECONDS);
160 this.bgpId = remoteOpen.getBgpIdentifier();
164 public synchronized void close() {
165 LOG.debug("Closing session: {}", this);
166 if (this.state != State.Idle) {
167 this.sendMessage(new NotifyBuilder().setErrorCode(BGPError.CEASE.getCode()).build());
168 this.channel.close();
169 this.state = State.Idle;
174 * Handles incoming message based on their type.
176 * @param msg incoming message
179 public void handleMessage(final Notification msg) {
180 // Update last reception time
181 this.lastMessageReceivedAt = System.nanoTime();
183 if (msg instanceof Open) {
184 // Open messages should not be present here
185 this.terminate(BGPError.FSM_ERROR);
186 } else if (msg instanceof Notify) {
187 // Notifications are handled internally
188 LOG.info("Session closed because Notification message received: {} / {}", ((Notify) msg).getErrorCode(),
189 ((Notify) msg).getErrorSubcode());
190 this.closeWithoutMessage();
191 this.listener.onSessionTerminated(this,
192 new BGPTerminationReason(BGPError.forValue(((Notify) msg).getErrorCode(), ((Notify) msg).getErrorSubcode())));
193 } else if (msg instanceof Keepalive) {
194 // Keepalives are handled internally
195 LOG.debug("Received KeepAlive messsage.");
197 if (this.kaCounter >= 2) {
198 this.sync.kaReceived();
201 // All others are passed up
202 this.listener.onMessage(this, msg);
203 this.sync.updReceived((Update) msg);
208 public synchronized void endOfInput() {
209 if (this.state == State.Up) {
210 this.listener.onSessionDown(this, new IOException("End of input detected. Close the session."));
214 void sendMessage(final Notification msg) {
216 this.channel.writeAndFlush(msg);
217 this.lastMessageSentAt = System.nanoTime();
218 LOG.debug("Sent message: {}", msg);
219 } catch (final Exception e) {
220 LOG.warn("Message {} was not sent.", msg, e);
224 private synchronized void closeWithoutMessage() {
225 LOG.debug("Closing session: {}", this);
226 this.channel.close();
227 this.state = State.Idle;
231 * Closes PCEP session from the parent with given reason. A message needs to be sent, but parent doesn't have to be
232 * modified, because he initiated the closing. (To prevent concurrent modification exception).
236 private void terminate(final BGPError error) {
237 this.sendMessage(new NotifyBuilder().setErrorCode(error.getCode()).setErrorSubcode(error.getSubcode()).build());
238 this.closeWithoutMessage();
240 this.listener.onSessionTerminated(this, new BGPTerminationReason(error));
244 * If HoldTimer expires, the session ends. If a message (whichever) was received during this period, the HoldTimer
245 * will be rescheduled by HOLD_TIMER_VALUE + the time that has passed from the start of the HoldTimer to the time at
246 * which the message was received. If the session was closed by the time this method starts to execute (the session
247 * state will become IDLE), then rescheduling won't occur.
249 private synchronized void handleHoldTimer() {
250 if (this.state == State.Idle) {
254 final long ct = System.nanoTime();
255 final long nextHold = this.lastMessageReceivedAt + TimeUnit.SECONDS.toNanos(this.holdTimerValue);
257 if (ct >= nextHold) {
258 LOG.debug("HoldTimer expired. " + new Date());
259 this.terminate(BGPError.HOLD_TIMER_EXPIRED);
261 this.stateTimer.newTimeout(new TimerTask() {
263 public void run(final Timeout timeout) throws Exception {
266 }, nextHold - ct, TimeUnit.NANOSECONDS);
271 * If KeepAlive Timer expires, sends KeepAlive message. If a message (whichever) was send during this period, the
272 * KeepAlive Timer will be rescheduled by KEEP_ALIVE_TIMER_VALUE + the time that has passed from the start of the
273 * KeepAlive timer to the time at which the message was sent. If the session was closed by the time this method
274 * starts to execute (the session state will become IDLE), that rescheduling won't occur.
276 private synchronized void handleKeepaliveTimer() {
277 if (this.state == State.Idle) {
281 final long ct = System.nanoTime();
282 long nextKeepalive = this.lastMessageSentAt + TimeUnit.SECONDS.toNanos(this.keepAlive);
284 if (ct >= nextKeepalive) {
285 this.sendMessage(KEEP_ALIVE);
286 nextKeepalive = this.lastMessageSentAt + TimeUnit.SECONDS.toNanos(this.keepAlive);
288 this.stateTimer.newTimeout(new TimerTask() {
290 public void run(final Timeout timeout) throws Exception {
291 handleKeepaliveTimer();
293 }, nextKeepalive - ct, TimeUnit.NANOSECONDS);
297 public final String toString() {
298 return addToStringAttributes(Objects.toStringHelper(this)).toString();
301 protected ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
302 toStringHelper.add("channel", this.channel);
303 toStringHelper.add("state", this.state);
304 return toStringHelper;
308 public Set<BgpTableType> getAdvertisedTableTypes() {
309 return this.tableTypes;
313 protected synchronized void sessionUp() {
314 this.state = State.Up;
315 this.listener.onSessionUp(this);
318 public synchronized State getState() {
323 public final Ipv4Address getBgpId() {
328 public final AsNumber getAsNumber() {
329 return this.asNumber;