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.pcep.impl;
10 import com.google.common.annotations.VisibleForTesting;
11 import com.google.common.base.Preconditions;
12 import io.netty.channel.Channel;
13 import io.netty.handler.ssl.SslHandler;
14 import io.netty.util.concurrent.Promise;
15 import java.util.concurrent.Future;
16 import java.util.concurrent.TimeUnit;
17 import java.util.concurrent.TimeoutException;
18 import javax.net.ssl.SSLContext;
19 import javax.net.ssl.SSLEngine;
20 import org.opendaylight.controller.config.yang.pcep.impl.Tls;
21 import org.opendaylight.protocol.pcep.impl.spi.Util;
22 import org.opendaylight.protocol.pcep.impl.tls.SslContextFactory;
23 import org.opendaylight.protocol.pcep.spi.PCEPErrors;
24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.message.rev131007.Keepalive;
25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.message.rev131007.KeepaliveBuilder;
26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.message.rev131007.OpenBuilder;
27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.message.rev131007.Pcerr;
28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.message.rev131007.Starttls;
29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.message.rev131007.StarttlsBuilder;
30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.Message;
31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.OpenMessage;
32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.keepalive.message.KeepaliveMessageBuilder;
33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.open.message.OpenMessageBuilder;
34 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.open.object.Open;
35 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.pcep.error.object.ErrorObject;
36 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.pcerr.message.pcerr.message.error.type.SessionCase;
37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.start.tls.message.StartTlsMessageBuilder;
38 import org.slf4j.Logger;
39 import org.slf4j.LoggerFactory;
42 * Abstract PCEP session negotiator. Takes care of basic handshake without implementing a specific policy. Policies need
43 * to be provided by a specific subclass.
45 public abstract class AbstractPCEPSessionNegotiator extends AbstractSessionNegotiator {
47 * Unified KeepWait and OpenWait timer expiration, in seconds.
49 public static final int FAIL_TIMER_VALUE = 60;
52 * PCEP session negotiation state transitions are described in RFC5440. Simplification the two timers (KeepWait and
53 * OpenWait) are merged into a FailTimer, as they are mutually exclusive, have the same timeout value and their
54 * action is to terminate negotiation. This timer is restarted between state transitions and runs in all states
55 * except Idle and Finished.
60 * Negotiation has not begun. It will be activated once we are asked to provide our initial proposal, at which
61 * point we move into OpenWait state.
65 * Waiting for the peer's StartTLS message
69 * Waiting for the peer's OPEN message.
73 * Waiting for the peer's KEEPALIVE message.
77 * Negotiation has completed.
82 private static final Logger LOG = LoggerFactory.getLogger(AbstractPCEPSessionNegotiator.class);
83 private static final Keepalive KEEPALIVE = new KeepaliveBuilder().setKeepaliveMessage(new KeepaliveMessageBuilder().build()).build();
85 private volatile boolean localOK, openRetry, remoteOK;
86 private volatile State state = State.IDLE;
87 private Future<?> failTimer;
88 private Open localPrefs;
89 private Open remotePrefs;
90 private Tls tlsConfiguration;
92 protected AbstractPCEPSessionNegotiator(final Promise<PCEPSessionImpl> promise, final Channel channel) {
93 super(promise, channel);
97 * Get the initial session parameters proposal.
99 * @return Session parameters proposal.
101 protected abstract Open getInitialProposal();
104 * Get the revised session parameters proposal based on the feedback the peer has provided to us.
106 * @param suggestion Peer-provided suggested session parameters
107 * @return Session parameters proposal, or null if peers session parameters preclude us from suggesting anything
109 protected abstract Open getRevisedProposal(Open suggestion);
112 * Check whether a peer-provided session parameters proposal is acceptable.
114 * @param proposal peer-proposed session parameters
115 * @return true if the proposal is acceptable, false otherwise
117 protected abstract boolean isProposalAcceptable(Open proposal);
120 * Given a peer-provided session parameters proposal which we found unacceptable, provide a counter-proposal. The
121 * requirement is that the isProposalAcceptable() method has to return true when presented with this proposal.
123 * @param proposal unacceptable peer proposal
124 * @return our counter-proposal, or null if there is no way to negotiate an acceptable proposal
126 protected abstract Open getCounterProposal(Open proposal);
129 * Create the protocol session.
131 * @param channel Underlying channel.
132 * @param localPrefs Session preferences proposed by us and accepted by the peer.
133 * @param remotePrefs Session preferences proposed by the peer and accepted by us.
134 * @return New protocol session.
136 protected abstract PCEPSessionImpl createSession(Channel channel, Open localPrefs, Open remotePrefs);
139 * Sends PCEP Error Message with one PCEPError.
143 private void sendErrorMessage(final PCEPErrors value) {
145 this.sendMessage(Util.createErrorMessage(value, null));
148 private void scheduleFailTimer() {
149 this.failTimer = this.channel.eventLoop().schedule(new Runnable() {
152 switch (AbstractPCEPSessionNegotiator.this.state) {
157 sendErrorMessage(PCEPErrors.STARTTLS_TIMER_EXP);
158 negotiationFailed(new TimeoutException("StartTLSWait timer expired"));
159 AbstractPCEPSessionNegotiator.this.state = State.FINISHED;
162 sendErrorMessage(PCEPErrors.NO_MSG_BEFORE_EXP_KEEPWAIT);
163 negotiationFailed(new TimeoutException("KeepWait timer expired"));
164 AbstractPCEPSessionNegotiator.this.state = State.FINISHED;
167 sendErrorMessage(PCEPErrors.NO_OPEN_BEFORE_EXP_OPENWAIT);
168 negotiationFailed(new TimeoutException("OpenWait timer expired"));
169 AbstractPCEPSessionNegotiator.this.state = State.FINISHED;
175 }, FAIL_TIMER_VALUE, TimeUnit.SECONDS);
179 protected final void startNegotiation() {
180 Preconditions.checkState(this.state == State.IDLE);
181 if (this.tlsConfiguration != null) {
182 this.sendMessage(new StarttlsBuilder().setStartTlsMessage(new StartTlsMessageBuilder().build()).build());
183 this.state = State.START_TLS_WAIT;
185 LOG.info("Started TLS connection negotiation with peer {}", this.channel);
187 startNegotiationWithOpen();
191 private void startNegotiationWithOpen() {
192 this.localPrefs = getInitialProposal();
193 final OpenMessage m = new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.message.rev131007.OpenBuilder().setOpenMessage(
194 new OpenMessageBuilder().setOpen(this.localPrefs).build()).build();
196 this.state = State.OPEN_WAIT;
199 LOG.info("PCEP session with {} started, sent proposal {}", this.channel, this.localPrefs);
202 private boolean handleMessageKeepWait(final Message msg) {
203 if (msg instanceof Keepalive) {
204 return handleMessageKeepAlive();
205 } else if (msg instanceof Pcerr) {
206 return handleMessagePcerr(msg);
211 private boolean handleMessageKeepAlive() {
214 LOG.info("PCEP peer {} completed negotiation", this.channel);
215 negotiationSuccessful(createSession(this.channel, this.localPrefs, this.remotePrefs));
216 this.state = State.FINISHED;
219 this.state = State.OPEN_WAIT;
220 LOG.debug("Channel {} moved to OpenWait state with localOK=1", this.channel);
225 private boolean handleMessagePcerr(final Message msg) {
226 final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.pcerr.message.PcerrMessage err = ((Pcerr) msg).getPcerrMessage();
227 if (err.getErrorType() == null) {
228 final ErrorObject obj = err.getErrors().get(0).getErrorObject();
229 LOG.warn("Unexpected error received from PCC: type {} value {}", obj.getType(), obj.getValue());
230 negotiationFailed(new IllegalStateException("Unexpected error received from PCC."));
231 this.state = State.IDLE;
234 this.localPrefs = getRevisedProposal(((SessionCase) err.getErrorType()).getSession().getOpen());
235 if (this.localPrefs == null) {
236 sendErrorMessage(PCEPErrors.PCERR_NON_ACC_SESSION_CHAR);
237 negotiationFailed(new IllegalStateException("Peer suggested unacceptable retry proposal"));
238 this.state = State.FINISHED;
241 this.sendMessage(new OpenBuilder().setOpenMessage(new OpenMessageBuilder().setOpen(this.localPrefs).build()).build());
242 if (!this.remoteOK) {
243 this.state = State.OPEN_WAIT;
249 private boolean handleMessageOpenWait(final Message msg) {
250 if (!(msg instanceof org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.message.rev131007.Open)) {
253 final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.open.message.OpenMessage o = ((org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.message.rev131007.Open) msg).getOpenMessage();
254 final Open open = o.getOpen();
255 if (isProposalAcceptable(open)) {
256 this.sendMessage(KEEPALIVE);
257 this.remotePrefs = open;
258 this.remoteOK = true;
260 negotiationSuccessful(createSession(this.channel, this.localPrefs, this.remotePrefs));
261 LOG.info("PCEP peer {} completed negotiation", this.channel);
262 this.state = State.FINISHED;
265 this.state = State.KEEP_WAIT;
266 LOG.debug("Channel {} moved to KeepWait state with remoteOK=1", this.channel);
270 if (this.openRetry) {
271 sendErrorMessage(PCEPErrors.SECOND_OPEN_MSG);
272 negotiationFailed(new IllegalStateException("OPEN renegotiation failed"));
273 this.state = State.FINISHED;
276 final Open newPrefs = getCounterProposal(open);
277 if (newPrefs == null) {
278 sendErrorMessage(PCEPErrors.NON_ACC_NON_NEG_SESSION_CHAR);
279 negotiationFailed(new IllegalStateException("Peer sent unacceptable session parameters"));
280 this.state = State.FINISHED;
283 this.sendMessage(Util.createErrorMessage(PCEPErrors.NON_ACC_NEG_SESSION_CHAR, newPrefs));
284 this.openRetry = true;
285 this.state = this.localOK ? State.OPEN_WAIT : State.KEEP_WAIT;
290 private boolean handleMessageStartTlsWait(final Message msg) {
291 if (msg instanceof Starttls) {
292 final SslContextFactory sslFactory = new SslContextFactory(this.tlsConfiguration);
293 final SSLContext sslContext = sslFactory.getServerContext();
294 if (sslContext == null) {
295 this.sendErrorMessage(PCEPErrors.NOT_POSSIBLE_WITHOUT_TLS);
296 negotiationFailed(new IllegalStateException("Failed to establish a TLS connection."));
297 this.state = State.FINISHED;
300 final SSLEngine engine = sslContext.createSSLEngine();
301 engine.setNeedClientAuth(true);
302 engine.setUseClientMode(false);
303 this.channel.pipeline().addFirst(new SslHandler(engine));
304 LOG.info("PCEPS TLS connection with peer: {} established succesfully.", this.channel);
305 startNegotiationWithOpen();
307 } else if (!(msg instanceof Pcerr)) {
308 this.sendErrorMessage(PCEPErrors.NON_STARTTLS_MSG_RCVD);
309 negotiationFailed(new IllegalStateException("Unexpected message recieved."));
310 this.state = State.FINISHED;
317 protected final void handleMessage(final Message msg) {
318 this.failTimer.cancel(false);
320 LOG.debug("Channel {} handling message {} in state {}", this.channel, msg, this.state);
322 switch (this.state) {
325 throw new IllegalStateException("Unexpected handleMessage in state " + this.state);
327 if (handleMessageStartTlsWait(msg)) {
332 if (handleMessageKeepWait(msg)) {
337 if (handleMessageOpenWait(msg)) {
344 LOG.warn("Channel {} in state {} received unexpected message {}", this.channel, this.state, msg);
345 sendErrorMessage(PCEPErrors.NON_OR_INVALID_OPEN_MSG);
346 negotiationFailed(new Exception("Illegal message encountered"));
347 this.state = State.FINISHED;
355 public void setTlsConfiguration(final Tls tlsConfiguration) {
356 this.tlsConfiguration = tlsConfiguration;
360 protected void negotiationFailed(final Throwable cause) {
361 this.LOG.debug("Negotiation on channel {} failed", this.channel, cause);
362 this.channel.close();
363 this.promise.setFailure(cause);