import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import io.netty.channel.Channel;
+import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.concurrent.Promise;
import java.util.concurrent.TimeUnit;
import javax.annotation.concurrent.GuardedBy;
import org.opendaylight.protocol.bgp.parser.BGPError;
import org.opendaylight.protocol.bgp.rib.impl.spi.BGPPeerRegistry;
import org.opendaylight.protocol.bgp.rib.impl.spi.BGPSessionPreferences;
-import org.opendaylight.protocol.bgp.rib.impl.spi.BGPSessionValidator;
import org.opendaylight.protocol.bgp.rib.spi.BGPSessionListener;
-import org.opendaylight.protocol.framework.AbstractSessionNegotiator;
+import org.opendaylight.protocol.bgp.rib.spi.SessionNegotiator;
import org.opendaylight.protocol.util.Values;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.IpAddress;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv4Address;
import org.slf4j.LoggerFactory;
/**
- * Bgp Session negotiator. Common for local -> remote and remote -> local connections.
+ * Bgp Session negotiator. Common for local-to-remote and remote-to-local connections.
* One difference is session validation performed by injected BGPSessionValidator when OPEN message is received.
*/
-public abstract class AbstractBGPSessionNegotiator extends AbstractSessionNegotiator<Notification, BGPSessionImpl> {
+public abstract class AbstractBGPSessionNegotiator extends ChannelInboundHandlerAdapter implements SessionNegotiator {
// 4 minutes recommended in http://tools.ietf.org/html/rfc4271#section-8.2.2
- protected static final int INITIAL_HOLDTIMER = 4;
+ private static final int INITIAL_HOLDTIMER = 4;
/**
* @see <a href="http://tools.ietf.org/html/rfc6793">BGP Support for 4-Octet AS Number Space</a>
/**
* Negotiation has not started yet.
*/
- Idle,
+ IDLE,
/**
* We have sent our Open message, and are waiting for the peer's Open message.
*/
- OpenSent,
+ OPEN_SENT,
/**
* We have received the peer's Open message, which is acceptable, and we're waiting the acknowledgement of our
* Open message.
*/
- OpenConfirm,
+ OPEN_CONFIRM,
/**
* The negotiation finished.
*/
- Finished,
+ FINISHED,
}
private static final Logger LOG = LoggerFactory.getLogger(AbstractBGPSessionNegotiator.class);
private final BGPPeerRegistry registry;
- private final BGPSessionValidator sessionValidator;
-
+ private final Promise<BGPSessionImpl> promise;
+ private final Channel channel;
@GuardedBy("this")
- private State state = State.Idle;
+ private State state = State.IDLE;
@GuardedBy("this")
private BGPSessionImpl session;
public AbstractBGPSessionNegotiator(final Promise<BGPSessionImpl> promise, final Channel channel,
- final BGPPeerRegistry registry, final BGPSessionValidator sessionValidator) {
- super(promise, channel);
+ final BGPPeerRegistry registry) {
+ this.promise = Preconditions.checkNotNull(promise);
+ this.channel = Preconditions.checkNotNull(channel);
this.registry = registry;
- this.sessionValidator = sessionValidator;
}
- @Override
- protected synchronized void startNegotiation() {
- Preconditions.checkState(this.state == State.Idle);
+ private synchronized void startNegotiation() {
+ // Open can be sent first either from ODL (IDLE) or from peer (OPEN_CONFIRM)
+ Preconditions.checkState(this.state == State.IDLE || this.state == State.OPEN_CONFIRM);
+ final IpAddress remoteIp = getRemoteIp();
// Check if peer is configured in registry before retrieving preferences
- if (!this.registry.isPeerConfigured(getRemoteIp())) {
+ if (!this.registry.isPeerConfigured(remoteIp)) {
final BGPDocumentedException cause = new BGPDocumentedException(
- "BGP peer with ip: " + getRemoteIp()
- + " not configured, check configured peers in : "
- + this.registry, BGPError.CONNECTION_REJECTED);
+ String.format("BGP peer with ip: %s not configured, check configured peers in : %s", remoteIp, this.registry), BGPError.CONNECTION_REJECTED);
negotiationFailed(cause);
return;
}
- final BGPSessionPreferences preferences = getPreferences();
+ final BGPSessionPreferences preferences = this.registry.getPeerPreferences(remoteIp);
int as = preferences.getMyAs().getValue().intValue();
// Set as AS_TRANS if the value is bigger than 2B
if (as > Values.UNSIGNED_SHORT_MAX_VALUE) {
as = AS_TRANS;
}
- this.sendMessage(new OpenBuilder().setMyAsNumber(as).setHoldTimer(preferences.getHoldTime()).setBgpIdentifier(
+ sendMessage(new OpenBuilder().setMyAsNumber(as).setHoldTimer(preferences.getHoldTime()).setBgpIdentifier(
preferences.getBgpId()).setBgpParameters(preferences.getParams()).build());
- if (this.state != State.Finished) {
- this.state = State.OpenSent;
+ if (this.state != State.FINISHED) {
+ this.state = State.OPEN_SENT;
this.channel.eventLoop().schedule(new Runnable() {
@Override
public void run() {
- if (AbstractBGPSessionNegotiator.this.state != State.Finished) {
+ if (AbstractBGPSessionNegotiator.this.state != State.FINISHED) {
AbstractBGPSessionNegotiator.this.sendMessage(buildErrorNotify(BGPError.HOLD_TIMER_EXPIRED));
negotiationFailed(new BGPDocumentedException("HoldTimer expired", BGPError.FSM_ERROR));
- AbstractBGPSessionNegotiator.this.state = State.Finished;
+ AbstractBGPSessionNegotiator.this.state = State.FINISHED;
}
}
}, INITIAL_HOLDTIMER, TimeUnit.MINUTES);
}
}
- private BGPSessionPreferences getPreferences() {
- return this.registry.getPeerPreferences(getRemoteIp());
- }
-
private IpAddress getRemoteIp() {
return StrictBGPPeerRegistry.getIpAddress(this.channel.remoteAddress());
}
- @Override
protected synchronized void handleMessage(final Notification msg) {
LOG.debug("Channel {} handling message in state {}", this.channel, this.state);
switch (this.state) {
- case Finished:
- case Idle:
- this.sendMessage(buildErrorNotify(BGPError.FSM_ERROR));
+ case FINISHED:
+ sendMessage(buildErrorNotify(BGPError.FSM_ERROR));
+ return;
+ case IDLE:
+ // to avoid race condition when Open message was sent by the peer before startNegotiation could be executed
+ if (msg instanceof Open) {
+ handleOpen((Open) msg);
+ return;
+ }
+ sendMessage(buildErrorNotify(BGPError.FSM_ERROR));
return;
- case OpenConfirm:
+ case OPEN_CONFIRM:
if (msg instanceof Keepalive) {
negotiationSuccessful(this.session);
LOG.info("BGP Session with peer {} established successfully.", this.channel);
final Notify ntf = (Notify) msg;
negotiationFailed(new BGPDocumentedException("Peer refusal", BGPError.forValue(ntf.getErrorCode(), ntf.getErrorSubcode())));
}
- this.state = State.Finished;
+ this.state = State.FINISHED;
return;
- case OpenSent:
+ case OPEN_SENT:
if (msg instanceof Open) {
- final Open openObj = (Open) msg;
- handleOpen(openObj);
+ handleOpen((Open) msg);
return;
}
break;
+ default:
+ break;
}
// Catch-all for unexpected message
LOG.warn("Channel {} state {} unexpected message {}", this.channel, this.state, msg);
- this.sendMessage(buildErrorNotify(BGPError.FSM_ERROR));
+ sendMessage(buildErrorNotify(BGPError.FSM_ERROR));
negotiationFailed(new BGPDocumentedException("Unexpected message", BGPError.FSM_ERROR));
- this.state = State.Finished;
+ this.state = State.FINISHED;
}
private static Notify buildErrorNotify(final BGPError err) {
- return new NotifyBuilder().setErrorCode(err.getCode()).setErrorSubcode(err.getSubcode()).build();
+ return buildErrorNotify(err, null);
}
- private void handleOpen(final Open openObj) {
- try {
- this.sessionValidator.validate(openObj, getPreferences());
- } catch (final BGPDocumentedException e) {
- negotiationFailed(e);
- return;
+ private static Notify buildErrorNotify(final BGPError err, final byte[] data) {
+ final NotifyBuilder builder = new NotifyBuilder().setErrorCode(err.getCode()).setErrorSubcode(err.getSubcode());
+ if (data != null && data.length != 0) {
+ builder.setData(data);
}
+ return builder.build();
+ }
+ private void handleOpen(final Open openObj) {
+ final IpAddress remoteIp = getRemoteIp();
+ final BGPSessionPreferences preferences = this.registry.getPeerPreferences(remoteIp);
try {
- final BGPSessionListener peer = this.registry.getPeer(getRemoteIp(), getSourceId(openObj, getPreferences()), getDestinationId(openObj, getPreferences()));
- this.sendMessage(new KeepaliveBuilder().build());
- this.session = new BGPSessionImpl(peer, this.channel, openObj, getPreferences());
- this.state = State.OpenConfirm;
+ final BGPSessionListener peer = this.registry.getPeer(remoteIp, getSourceId(openObj, preferences), getDestinationId(openObj, preferences), openObj);
+ sendMessage(new KeepaliveBuilder().build());
+ this.session = new BGPSessionImpl(peer, this.channel, openObj, preferences, this.registry);
+ this.state = State.OPEN_CONFIRM;
LOG.debug("Channel {} moved to OpenConfirm state with remote proposal {}", this.channel, openObj);
} catch (final BGPDocumentedException e) {
LOG.warn("Channel {} negotiation failed", this.channel, e);
}
}
- @Override
- protected void negotiationFailed(final Throwable e) {
+ private void negotiationFailed(final Throwable e) {
LOG.warn("Channel {} negotiation failed: {}", this.channel, e.getMessage());
if (e instanceof BGPDocumentedException) {
// although sendMessage() can also result in calling this method, it won't create a cycle. In case sendMessage() fails to
// deliver the message, this method gets called with different exception (definitely not with BGPDocumentedException).
- this.sendMessage(buildErrorNotify(((BGPDocumentedException)e).getError()));
+ sendMessage(buildErrorNotify(((BGPDocumentedException)e).getError(), ((BGPDocumentedException) e).getData()));
}
- this.registry.removePeerSession(getRemoteIp());
- super.negotiationFailed(e);
- this.state = State.Finished;
+ if (this.state == State.OPEN_CONFIRM) {
+ this.registry.removePeerSession(getRemoteIp());
+ }
+ negotiationFailedCloseChannel(e);
+ this.state = State.FINISHED;
}
/**
+ * @param openMsg Open message received from remote BGP speaker
+ * @param preferences Local BGP speaker preferences
* @return BGP Id of device that accepted the connection
*/
protected abstract Ipv4Address getDestinationId(final Open openMsg, final BGPSessionPreferences preferences);
/**
- * @return BGP Id of device that initiated the connection
+ * @param openMsg Open message received from remote BGP speaker
+ * @param preferences Local BGP speaker preferences
+ * @return BGP Id of device that accepted the connection
*/
protected abstract Ipv4Address getSourceId(final Open openMsg, final BGPSessionPreferences preferences);
public synchronized State getState() {
return this.state;
}
+
+ private void negotiationSuccessful(final BGPSessionImpl session) {
+ LOG.debug("Negotiation on channel {} successful with session {}", this.channel, session);
+ this.channel.pipeline().replace(this, "session", session);
+ this.promise.setSuccess(session);
+ }
+
+ private void negotiationFailedCloseChannel(final Throwable cause) {
+ LOG.debug("Negotiation on channel {} failed", this.channel, cause);
+ this.channel.close();
+ this.promise.setFailure(cause);
+ }
+
+ private void sendMessage(final Notification msg) {
+ this.channel.writeAndFlush(msg).addListener(new ChannelFutureListener() {
+ @Override
+ public void operationComplete(final ChannelFuture f) {
+ if (!f.isSuccess()) {
+ LOG.warn("Failed to send message {}", msg, f.cause());
+ negotiationFailedCloseChannel(f.cause());
+ } else {
+ LOG.trace("Message {} sent to socket", msg);
+ }
+
+ }
+ });
+ }
+
+ @Override
+ public final void channelActive(final ChannelHandlerContext ctx) {
+ LOG.debug("Starting session negotiation on channel {}", this.channel);
+
+ try {
+ startNegotiation();
+ } catch (final Exception e) {
+ LOG.warn("Unexpected negotiation failure", e);
+ negotiationFailedCloseChannel(e);
+ }
+
+ }
+
+ @Override
+ public final void channelRead(final ChannelHandlerContext ctx, final Object msg) {
+ LOG.debug("Negotiation read invoked on channel {}", this.channel);
+
+ try {
+ handleMessage((Notification) msg);
+ } catch (final Exception e) {
+ LOG.debug("Unexpected error while handling negotiation message {}", msg, e);
+ negotiationFailedCloseChannel(e);
+ }
+
+ }
+
+ @Override
+ public void exceptionCaught(final ChannelHandlerContext ctx, final Throwable cause) {
+ LOG.info("Unexpected error during negotiation", cause);
+ negotiationFailedCloseChannel(cause);
+ }
}
Code Review / bgpcep.git / blobdiff