3 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
5 * This program and the accompanying materials are made available under the
6 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
7 * and is available at http://www.eclipse.org/legal/epl-v10.html
13 package org.opendaylight.controller.arphandler.internal;
15 import java.net.InetAddress;
16 import java.net.UnknownHostException;
17 import java.util.Arrays;
18 import java.util.Collections;
19 import java.util.EnumSet;
20 import java.util.HashSet;
22 import java.util.Timer;
23 import java.util.TimerTask;
24 import java.util.concurrent.BlockingQueue;
25 import java.util.concurrent.ConcurrentHashMap;
26 import java.util.concurrent.ConcurrentMap;
27 import java.util.concurrent.CopyOnWriteArraySet;
28 import java.util.concurrent.LinkedBlockingQueue;
30 import org.opendaylight.controller.arphandler.ARPCacheEvent;
31 import org.opendaylight.controller.arphandler.ARPEvent;
32 import org.opendaylight.controller.arphandler.ARPReply;
33 import org.opendaylight.controller.arphandler.ARPRequest;
34 import org.opendaylight.controller.clustering.services.CacheConfigException;
35 import org.opendaylight.controller.clustering.services.CacheExistException;
36 import org.opendaylight.controller.clustering.services.ICacheUpdateAware;
37 import org.opendaylight.controller.clustering.services.IClusterContainerServices;
38 import org.opendaylight.controller.clustering.services.IClusterServices;
39 import org.opendaylight.controller.connectionmanager.IConnectionManager;
40 import org.opendaylight.controller.hosttracker.IfHostListener;
41 import org.opendaylight.controller.hosttracker.IfIptoHost;
42 import org.opendaylight.controller.hosttracker.hostAware.HostNodeConnector;
43 import org.opendaylight.controller.hosttracker.hostAware.IHostFinder;
44 import org.opendaylight.controller.sal.core.ConstructionException;
45 import org.opendaylight.controller.sal.core.Node;
46 import org.opendaylight.controller.sal.core.NodeConnector;
47 import org.opendaylight.controller.sal.packet.ARP;
48 import org.opendaylight.controller.sal.packet.Ethernet;
49 import org.opendaylight.controller.sal.packet.IDataPacketService;
50 import org.opendaylight.controller.sal.packet.IListenDataPacket;
51 import org.opendaylight.controller.sal.packet.IPv4;
52 import org.opendaylight.controller.sal.packet.Packet;
53 import org.opendaylight.controller.sal.packet.PacketResult;
54 import org.opendaylight.controller.sal.packet.RawPacket;
55 import org.opendaylight.controller.sal.utils.EtherTypes;
56 import org.opendaylight.controller.sal.utils.HexEncode;
57 import org.opendaylight.controller.sal.utils.NetUtils;
58 import org.opendaylight.controller.switchmanager.ISwitchManager;
59 import org.opendaylight.controller.switchmanager.Subnet;
60 import org.opendaylight.controller.topologymanager.ITopologyManager;
61 import org.slf4j.Logger;
62 import org.slf4j.LoggerFactory;
64 public class ArpHandler implements IHostFinder, IListenDataPacket, ICacheUpdateAware<ARPEvent, Boolean> {
65 private static final Logger log = LoggerFactory.getLogger(ArpHandler.class);
66 static final String ARP_EVENT_CACHE_NAME = "arphandler.arpRequestReplyEvent";
67 private IfIptoHost hostTracker;
68 private ISwitchManager switchManager;
69 private ITopologyManager topologyManager;
70 private IDataPacketService dataPacketService;
71 private IClusterContainerServices clusterContainerService;
72 private IConnectionManager connectionManager;
73 private Set<IfHostListener> hostListeners = new CopyOnWriteArraySet<IfHostListener>();
74 private ConcurrentMap<InetAddress, Set<HostNodeConnector>> arpRequestors;
75 private ConcurrentMap<InetAddress, Short> countDownTimers;
76 private Timer periodicTimer;
77 private BlockingQueue<ARPCacheEvent> ARPCacheEvents = new LinkedBlockingQueue<ARPCacheEvent>();
78 private Thread cacheEventHandler;
79 private boolean stopping = false;
81 * A cluster allocated cache. Used for synchronizing ARP request/reply
82 * events across all cluster controllers. To raise an event, we put() a specific
83 * event object (as key) and all nodes handle it in the entryUpdated callback.
85 * In case of ARPReply, we put true value to send replies to any requestors
86 * by calling generateAndSendReply
88 private ConcurrentMap<ARPEvent, Boolean> arpRequestReplyEvent;
90 void setConnectionManager(IConnectionManager cm){
91 this.connectionManager = cm;
94 void unsetConnectionManager(IConnectionManager cm){
95 if (this.connectionManager == cm){
96 connectionManager = null;
100 void setClusterContainerService(IClusterContainerServices s){
101 this.clusterContainerService = s;
104 void unsetClusterContainerService(IClusterContainerServices s) {
105 if (this.clusterContainerService == s) {
106 this.clusterContainerService = null;
110 void setHostListener(IfHostListener s) {
111 if (this.hostListeners != null) {
112 this.hostListeners.add(s);
116 void unsetHostListener(IfHostListener s) {
117 if (this.hostListeners != null) {
118 this.hostListeners.remove(s);
122 void setDataPacketService(IDataPacketService s) {
123 this.dataPacketService = s;
126 void unsetDataPacketService(IDataPacketService s) {
127 if (this.dataPacketService == s) {
128 this.dataPacketService = null;
132 public void setHostTracker(IfIptoHost hostTracker) {
133 log.debug("Setting HostTracker");
134 this.hostTracker = hostTracker;
137 public void unsetHostTracker(IfIptoHost s) {
138 log.debug("UNSetting HostTracker");
139 if (this.hostTracker == s) {
140 this.hostTracker = null;
144 public void setTopologyManager(ITopologyManager tm) {
145 this.topologyManager = tm;
148 public void unsetTopologyManager(ITopologyManager tm) {
149 if (this.topologyManager == tm) {
150 this.topologyManager = null;
154 protected void sendARPReply(NodeConnector p, byte[] sMAC, InetAddress sIP,
155 byte[] tMAC, InetAddress tIP) {
156 byte[] senderIP = sIP.getAddress();
157 byte[] targetIP = tIP.getAddress();
158 ARP arp = createARP(ARP.REPLY,sMAC,senderIP,tMAC,targetIP);
160 Ethernet ethernet = createEthernet(sMAC, tMAC, arp);
162 RawPacket destPkt = this.dataPacketService.encodeDataPacket(ethernet);
163 destPkt.setOutgoingNodeConnector(p);
165 this.dataPacketService.transmitDataPacket(destPkt);
168 protected void handleARPPacket(Ethernet eHeader, ARP pkt, NodeConnector p) {
170 byte[] sourceMAC = eHeader.getSourceMACAddress();
171 byte[] targetMAC = eHeader.getDestinationMACAddress();
173 * Sanity Check; drop ARP packets originated by the controller itself.
174 * This is to avoid continuous flooding
176 if (Arrays.equals(sourceMAC, getControllerMAC())) {
177 if (log.isDebugEnabled()) {
178 log.debug("Receive a self originated ARP pkt (srcMAC {}) --> DROP",
179 HexEncode.bytesToHexString(sourceMAC));
184 InetAddress targetIP, sourceIP;
186 targetIP = InetAddress.getByAddress(pkt.getTargetProtocolAddress());
187 sourceIP = InetAddress.getByAddress(pkt.getSenderProtocolAddress());
188 } catch (UnknownHostException e1) {
189 log.debug("Invalid host in ARP packet: {}", e1.getMessage());
193 Subnet subnet = null;
194 if (switchManager != null) {
195 subnet = switchManager.getSubnetByNetworkAddress(sourceIP);
197 if (subnet == null) {
198 log.debug("ARPHandler: can't find subnet matching {}, drop packet", sourceIP);
202 // Make sure that the host is a legitimate member of this subnet
203 if (!subnet.hasNodeConnector(p)) {
204 log.debug("{} showing up on {} does not belong to {}",
205 new Object[] { sourceIP, p, subnet });
209 HostNodeConnector requestor = null;
210 if (NetUtils.isUnicastMACAddr(sourceMAC) && p.getNode() != null) {
212 requestor = new HostNodeConnector(sourceMAC, sourceIP, p, subnet.getVlan());
213 } catch (ConstructionException e) {
214 log.debug("Received ARP packet with invalid MAC: {}", HexEncode.bytesToHexString(sourceMAC));
218 * Learn host from the received ARP REQ/REPLY, inform Host Tracker
220 log.trace("Inform Host tracker of new host {}", requestor.getNetworkAddress());
221 for (IfHostListener listener : this.hostListeners) {
222 listener.hostListener(requestor);
227 * OpCode != request -> ARP Reply. If there are hosts (in
228 * arpRequestors) waiting for the ARP reply for this sourceIP, it's
229 * time to generate the reply and send it to these hosts.
231 * If sourceIP==targetIP, it is a Gratuitous ARP. If there are hosts (in
232 * arpRequestors) waiting for the ARP reply for this sourceIP, it's time
233 * to generate the reply and send it to these hosts
236 if (pkt.getOpCode() != ARP.REQUEST || sourceIP.equals(targetIP)) {
237 // Raise a reply event so that any waiting requestors will be sent a reply
238 // the true value indicates we should generate replies to requestors across the cluster
239 log.trace("Received ARP reply packet from {}, reply to all requestors.", sourceIP);
240 arpRequestReplyEvent.put(new ARPReply(sourceIP, sourceMAC), true);
245 * ARP Request Handling:
246 * If targetIP is the IP of the subnet, reply with ARP REPLY
247 * If targetIP is a known host, PROXY ARP (by sending ARP REPLY) on behalf of known target hosts.
248 * For unknown target hosts, generate and send an ARP request to ALL switches/ports using
249 * the IP address defined in the subnet as source address
252 * If target IP is gateway IP, Send ARP reply
254 if ((targetIP.equals(subnet.getNetworkAddress()))
255 && (NetUtils.isBroadcastMACAddr(targetMAC) || Arrays.equals(targetMAC, getControllerMAC()))) {
256 if (connectionManager.isLocal(p.getNode())){
257 if (log.isTraceEnabled()){
258 log.trace("Received local ARP req. for default gateway. Replying with controller MAC: {}",
259 HexEncode.bytesToHexString(getControllerMAC()));
261 sendARPReply(p, getControllerMAC(), targetIP, pkt.getSenderHardwareAddress(), sourceIP);
263 log.trace("Received non-local ARP req. for default gateway. Raising reply event");
264 arpRequestReplyEvent.put(
265 new ARPReply(p, targetIP, getControllerMAC(), sourceIP, pkt.getSenderHardwareAddress()), false);
271 HostNodeConnector host = hostTracker.hostQuery(targetIP);
272 // unknown host, initiate ARP request
274 // add the requestor to the list so that we can replay the reply
275 // when the host responds
276 if (requestor != null) {
277 Set<HostNodeConnector> requestorSet = arpRequestors.get(targetIP);
278 if (requestorSet == null) {
279 requestorSet = Collections.newSetFromMap(new ConcurrentHashMap<HostNodeConnector, Boolean>());
280 arpRequestors.put(targetIP, requestorSet);
282 requestorSet.add(requestor);
283 countDownTimers.put(targetIP, (short) 2); // reset timeout to 2sec
285 //Raise a bcast request event, all controllers need to send one
286 log.trace("Sending a bcast ARP request for {}", targetIP);
287 arpRequestReplyEvent.put(new ARPRequest(targetIP, subnet), false);
290 * Target host known (across the cluster), send ARP REPLY make sure that targetMAC
291 * matches the host's MAC if it is not broadcastMAC
293 if (NetUtils.isBroadcastMACAddr(targetMAC) || Arrays.equals(host.getDataLayerAddressBytes(), targetMAC)) {
294 log.trace("Received ARP req. for known host {}, sending reply...", targetIP);
295 if (connectionManager.isLocal(p.getNode())) {
297 host.getDataLayerAddressBytes(),
298 host.getNetworkAddress(),
299 pkt.getSenderHardwareAddress(),
302 arpRequestReplyEvent.put(new ARPReply(
304 host.getNetworkAddress(),
305 host.getDataLayerAddressBytes(),
307 pkt.getSenderHardwareAddress()), false);
311 * Target MAC has been changed. For now, discard it.
312 * TODO: We may need to send unicast ARP REQUEST on behalf of
313 * the target back to the sender to trigger the sender to update
321 * Send a broadcast ARP Request to the switch/ ports using
322 * the networkAddress of the subnet as sender IP
323 * the controller's MAC as sender MAC
324 * the targetIP as the target Network Address
326 protected void sendBcastARPRequest(InetAddress targetIP, Subnet subnet) {
327 log.trace("sendBcatARPRequest targetIP:{} subnet:{}", targetIP, subnet);
328 Set<NodeConnector> nodeConnectors;
329 if (subnet.isFlatLayer2()) {
330 nodeConnectors = new HashSet<NodeConnector>();
331 for (Node n : this.switchManager.getNodes()) {
332 nodeConnectors.addAll(this.switchManager.getUpNodeConnectors(n));
335 nodeConnectors = subnet.getNodeConnectors();
337 byte[] targetHardwareAddress = new byte[] { (byte) 0, (byte) 0, (byte) 0, (byte) 0, (byte) 0, (byte) 0 };
338 for (NodeConnector p : nodeConnectors) {
339 //fiter out any non-local or internal ports
340 if (! connectionManager.isLocal(p.getNode()) || topologyManager.isInternal(p)) {
343 log.trace("Sending toward nodeConnector:{}", p);
344 byte[] senderIP = subnet.getNetworkAddress().getAddress();
345 byte[] targetIPByte = targetIP.getAddress();
346 ARP arp = createARP(ARP.REQUEST, getControllerMAC(), senderIP, targetHardwareAddress, targetIPByte);
348 byte[] destMACAddress = NetUtils.getBroadcastMACAddr();
349 Ethernet ethernet = createEthernet(getControllerMAC(), destMACAddress, arp);
351 // TODO For now send port-by-port, see how to optimize to
352 // send to multiple ports at once
353 RawPacket destPkt = this.dataPacketService.encodeDataPacket(ethernet);
354 destPkt.setOutgoingNodeConnector(p);
356 this.dataPacketService.transmitDataPacket(destPkt);
361 * Send a unicast ARP Request to the known host on a specific switch/port as
362 * defined in the host.
363 * The sender IP is the networkAddress of the subnet
364 * The sender MAC is the controller's MAC
366 protected void sendUcastARPRequest(HostNodeConnector host, Subnet subnet) {
367 log.trace("sendUcastARPRequest host:{} subnet:{}", host, subnet);
368 NodeConnector outPort = host.getnodeConnector();
369 if (outPort == null) {
370 log.error("Failed sending UcastARP because cannot extract output port from Host: {}", host);
374 byte[] senderIP = subnet.getNetworkAddress().getAddress();
375 byte[] targetIP = host.getNetworkAddress().getAddress();
376 byte[] targetMAC = host.getDataLayerAddressBytes();
377 ARP arp = createARP(ARP.REQUEST, getControllerMAC(), senderIP, targetMAC, targetIP);
379 Ethernet ethernet = createEthernet(getControllerMAC(), targetMAC, arp);
381 RawPacket destPkt = this.dataPacketService.encodeDataPacket(ethernet);
382 destPkt.setOutgoingNodeConnector(outPort);
384 this.dataPacketService.transmitDataPacket(destPkt);
388 public void find(InetAddress networkAddress) {
389 log.trace("Received find IP {}", networkAddress);
391 Subnet subnet = null;
392 if (switchManager != null) {
393 subnet = switchManager.getSubnetByNetworkAddress(networkAddress);
395 if (subnet == null) {
396 log.debug("Can't find subnet matching IP {}", networkAddress);
400 // send a broadcast ARP Request to this IP
401 arpRequestReplyEvent.put(new ARPRequest(networkAddress, subnet), false);
405 * Probe the host by sending a unicast ARP Request to the host
408 public void probe(HostNodeConnector host) {
409 log.trace("Received probe host {}", host);
411 Subnet subnet = null;
412 if (switchManager != null) {
413 subnet = switchManager.getSubnetByNetworkAddress(host
414 .getNetworkAddress());
416 if (subnet == null) {
417 log.debug("can't find subnet matching {}", host.getNetworkAddress());
421 if (connectionManager.isLocal(host.getnodeconnectorNode())){
422 log.trace("Send a ucast ARP req. to: {}", host);
423 sendUcastARPRequest(host, subnet);
425 log.trace("Raise a ucast ARP req. event to: {}", host);
426 arpRequestReplyEvent.put(new ARPRequest(host, subnet), false);
431 * An IP packet is punted to the controller, this means that the
432 * destination host is not known to the controller.
433 * Need to discover it by sending a Broadcast ARP Request
435 protected void handlePuntedIPPacket(IPv4 pkt, NodeConnector p) {
437 InetAddress dIP = NetUtils.getInetAddress(pkt.getDestinationAddress());
442 Subnet subnet = null;
443 if (switchManager != null) {
444 subnet = switchManager.getSubnetByNetworkAddress(dIP);
446 if (subnet == null) {
447 log.debug("Can't find subnet matching {}, drop packet", dIP);
450 log.trace("Punted IP pkt from {}, sending bcast ARP event...", dIP);
452 * unknown destination host, initiate bcast ARP request
454 arpRequestReplyEvent.put(new ARPRequest(dIP, subnet), false);
458 public byte[] getControllerMAC() {
459 if (switchManager == null) {
462 return switchManager.getControllerMAC();
466 * Function called by the dependency manager when all the required
467 * dependencies are satisfied
471 arpRequestors = new ConcurrentHashMap<InetAddress, Set<HostNodeConnector>>();
472 countDownTimers = new ConcurrentHashMap<InetAddress, Short>();
473 cacheEventHandler = new Thread(new ARPCacheEventHandler(), "ARPCacheEventHandler Thread");
479 @SuppressWarnings({ "unchecked", "deprecation" })
480 private void retrieveCaches() {
481 ConcurrentMap<?,?> map;
483 if (this.clusterContainerService == null){
484 log.error("Cluster service unavailable, can't retieve ARPHandler caches!");
488 map = clusterContainerService.getCache(ARP_EVENT_CACHE_NAME);
490 this.arpRequestReplyEvent = (ConcurrentMap<ARPEvent, Boolean>) map;
492 log.error("Cache allocation failed for {}", ARP_EVENT_CACHE_NAME);
496 @SuppressWarnings("deprecation")
497 private void allocateCaches() {
498 if (clusterContainerService == null){
499 nonClusterObjectCreate();
500 log.error("Clustering service unavailable. Allocated non-cluster caches for ARPHandler.");
505 clusterContainerService.createCache(ARP_EVENT_CACHE_NAME,
506 EnumSet.of(IClusterServices.cacheMode.TRANSACTIONAL));
507 } catch (CacheConfigException e){
508 log.error("ARPHandler cache configuration invalid!");
509 } catch (CacheExistException e){
510 log.debug("ARPHandler cache exists, skipped allocation.");
515 private void nonClusterObjectCreate(){
516 arpRequestReplyEvent = new ConcurrentHashMap<ARPEvent, Boolean>();
519 * Function called by the dependency manager when at least one
520 * dependency become unsatisfied or when the component is shutting
521 * down because for example bundle is being stopped.
525 cacheEventHandler.interrupt();
529 * Function called by dependency manager after "init ()" is called
530 * and after the services provided by the class are registered in
531 * the service registry
536 startPeriodicTimer();
537 cacheEventHandler.start();
541 * Function called by the dependency manager before the services
542 * exported by the component are unregistered, this will be
543 * followed by a "destroy ()" calls
551 cancelPeriodicTimer();
554 void setSwitchManager(ISwitchManager s) {
555 log.debug("SwitchManager service set.");
556 this.switchManager = s;
559 void unsetSwitchManager(ISwitchManager s) {
560 if (this.switchManager == s) {
561 log.debug("SwitchManager service UNset.");
562 this.switchManager = null;
567 public PacketResult receiveDataPacket(RawPacket inPkt) {
569 return PacketResult.IGNORED;
571 log.trace("Received a frame of size: {}", inPkt.getPacketData().length);
572 Packet formattedPak = this.dataPacketService.decodeDataPacket(inPkt);
573 if (formattedPak instanceof Ethernet) {
574 Object nextPak = formattedPak.getPayload();
575 if (nextPak instanceof IPv4) {
576 log.trace("Handle IP packet: {}", formattedPak);
577 handlePuntedIPPacket((IPv4) nextPak, inPkt.getIncomingNodeConnector());
578 } else if (nextPak instanceof ARP) {
579 log.trace("Handle ARP packet: {}", formattedPak);
580 handleARPPacket((Ethernet) formattedPak, (ARP) nextPak, inPkt
581 .getIncomingNodeConnector());
584 return PacketResult.IGNORED;
587 private ARP createARP(short opCode, byte[] senderMacAddress, byte[] senderIP, byte[] targetMacAddress, byte[] targetIP) {
589 arp.setHardwareType(ARP.HW_TYPE_ETHERNET);
590 arp.setProtocolType(EtherTypes.IPv4.shortValue());
591 arp.setHardwareAddressLength((byte) 6);
592 arp.setProtocolAddressLength((byte) 4);
593 arp.setOpCode(opCode);
594 arp.setSenderHardwareAddress(senderMacAddress) ;
595 arp.setSenderProtocolAddress(senderIP);
596 arp.setTargetHardwareAddress(targetMacAddress);
597 arp.setTargetProtocolAddress(targetIP);
601 private Ethernet createEthernet(byte[] sourceMAC, byte[] targetMAC, ARP arp) {
602 Ethernet ethernet = new Ethernet();
603 ethernet.setSourceMACAddress(sourceMAC);
604 ethernet.setDestinationMACAddress(targetMAC);
605 ethernet.setEtherType(EtherTypes.ARP.shortValue());
606 ethernet.setPayload(arp);
610 private void startPeriodicTimer() {
611 this.periodicTimer = new Timer("ArpHandler Periodic Timer");
612 this.periodicTimer.scheduleAtFixedRate(new TimerTask() {
613 @SuppressWarnings("deprecation")
616 Set<InetAddress> targetIPs = countDownTimers.keySet();
617 Set<InetAddress> expiredTargets = new HashSet<InetAddress>();
618 for (InetAddress t : targetIPs) {
619 short tick = countDownTimers.get(t);
622 expiredTargets.add(t);
624 countDownTimers.replace(t, tick);
627 for (InetAddress tIP : expiredTargets) {
628 countDownTimers.remove(tIP);
629 // Remove the requestor(s) who have been waiting for the ARP
630 // reply from this target for more than 1sec
631 arpRequestors.remove(tIP);
632 log.debug("ARP reply was not received from {}", tIP);
635 // Clean up ARP event cache
637 if (clusterContainerService.amICoordinator() && ! arpRequestReplyEvent.isEmpty()){
638 arpRequestReplyEvent.clear();
640 } catch (Exception e){
641 log.warn("ARPHandler: A cluster member failed to clear event cache.");
647 private void cancelPeriodicTimer() {
648 if (this.periodicTimer != null) {
649 this.periodicTimer.cancel();
653 private void generateAndSendReply(InetAddress sourceIP, byte[] sourceMAC) {
654 if (log.isTraceEnabled()) {
655 log.trace("generateAndSendReply called with params sourceIP:{} sourceMAC:{}", sourceIP,
656 HexEncode.bytesToHexString(sourceMAC));
658 Set<HostNodeConnector> hosts = arpRequestors.remove(sourceIP);
659 if ((hosts == null) || hosts.isEmpty()) {
660 log.trace("Bailing out no requestors Hosts");
663 countDownTimers.remove(sourceIP);
664 for (HostNodeConnector host : hosts) {
665 if (log.isTraceEnabled()) {
666 log.trace("Sending ARP Reply with src {}/{}, target {}/{}",
668 HexEncode.bytesToHexString(sourceMAC),
670 HexEncode.bytesToHexString(host.getDataLayerAddressBytes()),
671 host.getNetworkAddress() });
673 if (connectionManager.isLocal(host.getnodeconnectorNode())){
674 sendARPReply(host.getnodeConnector(),
677 host.getDataLayerAddressBytes(),
678 host.getNetworkAddress());
681 * In the remote event a requestor moved to another
682 * controller it may turn out it now we need to send
683 * the ARP reply from a different controller, this
686 arpRequestReplyEvent.put(
688 host.getnodeConnector(),
691 host.getNetworkAddress(),
692 host.getDataLayerAddressBytes()), false);
699 public void entryUpdated(ARPEvent key, Boolean new_value, String cacheName, boolean originLocal) {
700 log.trace("Got and entryUpdated for cacheName {} key {} isNew {}", cacheName, key, new_value);
701 enqueueARPCacheEvent(key, new_value);
705 public void entryCreated(ARPEvent key, String cacheName, boolean originLocal) {
709 public void entryDeleted(ARPEvent key, String cacheName, boolean originLocal) {
713 private void enqueueARPCacheEvent (ARPEvent event, boolean new_value) {
715 ARPCacheEvent cacheEvent = new ARPCacheEvent(event, new_value);
716 if (!ARPCacheEvents.contains(cacheEvent)) {
717 this.ARPCacheEvents.add(cacheEvent);
718 log.trace("Enqueued {}", event);
720 } catch (Exception e) {
721 log.debug("enqueueARPCacheEvent caught Interrupt Exception for event {}", event);
726 * this thread monitors the connectionEvent queue for new incoming events from
728 private class ARPCacheEventHandler implements Runnable {
733 ARPCacheEvent ev = ARPCacheEvents.take();
734 ARPEvent event = ev.getEvent();
735 if (event instanceof ARPRequest) {
736 ARPRequest req = (ARPRequest) event;
737 // If broadcast request
738 if (req.getHost() == null) {
739 log.trace("Trigger and ARP Broadcast Request upon receipt of {}", req);
740 sendBcastARPRequest(req.getTargetIP(), req.getSubnet());
742 //If unicast and local, send reply
743 } else if (connectionManager.isLocal(req.getHost().getnodeconnectorNode())) {
744 log.trace("ARPCacheEventHandler - sendUcatARPRequest upon receipt of {}", req);
745 sendUcastARPRequest(req.getHost(), req.getSubnet());
747 } else if (event instanceof ARPReply) {
748 ARPReply rep = (ARPReply) event;
749 // New reply received by controller, notify all awaiting requestors across the cluster
750 if (ev.isNewReply()) {
751 log.trace("Trigger a generateAndSendReply in response to {}", rep);
752 generateAndSendReply(rep.getTargetIP(), rep.getTargetMac());
753 // Otherwise, a specific reply. If local, send out.
754 } else if (connectionManager.isLocal(rep.getPort().getNode())) {
755 log.trace("ARPCacheEventHandler - sendUcatARPReply locally in response to {}", rep);
756 sendARPReply(rep.getPort(),
763 } catch (InterruptedException e) {
764 ARPCacheEvents.clear();