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
9 package org.opendaylight.controller.hosttracker.internal;
11 import java.net.InetAddress;
12 import java.net.UnknownHostException;
13 import java.util.ArrayList;
14 import java.util.Collections;
15 import java.util.Dictionary;
16 import java.util.EnumSet;
17 import java.util.HashSet;
18 import java.util.List;
20 import java.util.Map.Entry;
22 import java.util.Timer;
23 import java.util.TimerTask;
24 import java.util.concurrent.Callable;
25 import java.util.concurrent.ConcurrentHashMap;
26 import java.util.concurrent.ConcurrentMap;
27 import java.util.concurrent.ExecutorService;
28 import java.util.concurrent.Executors;
29 import java.util.concurrent.Future;
31 import org.apache.felix.dm.Component;
32 import org.eclipse.osgi.framework.console.CommandInterpreter;
33 import org.eclipse.osgi.framework.console.CommandProvider;
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.hosttracker.IfHostListener;
40 import org.opendaylight.controller.hosttracker.IfIptoHost;
41 import org.opendaylight.controller.hosttracker.IfNewHostNotify;
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.Edge;
46 import org.opendaylight.controller.sal.core.Host;
47 import org.opendaylight.controller.sal.core.Node;
48 import org.opendaylight.controller.sal.core.NodeConnector;
49 import org.opendaylight.controller.sal.core.Property;
50 import org.opendaylight.controller.sal.core.State;
51 import org.opendaylight.controller.sal.core.Tier;
52 import org.opendaylight.controller.sal.core.UpdateType;
53 import org.opendaylight.controller.sal.packet.address.DataLinkAddress;
54 import org.opendaylight.controller.sal.packet.address.EthernetAddress;
55 import org.opendaylight.controller.sal.topology.TopoEdgeUpdate;
56 import org.opendaylight.controller.sal.utils.GlobalConstants;
57 import org.opendaylight.controller.sal.utils.HexEncode;
58 import org.opendaylight.controller.sal.utils.NetUtils;
59 import org.opendaylight.controller.sal.utils.NodeCreator;
60 import org.opendaylight.controller.sal.utils.Status;
61 import org.opendaylight.controller.sal.utils.StatusCode;
62 import org.opendaylight.controller.switchmanager.IInventoryListener;
63 import org.opendaylight.controller.switchmanager.ISwitchManager;
64 import org.opendaylight.controller.switchmanager.ISwitchManagerAware;
65 import org.opendaylight.controller.switchmanager.Subnet;
66 import org.opendaylight.controller.topologymanager.ITopologyManager;
67 import org.opendaylight.controller.topologymanager.ITopologyManagerAware;
68 import org.osgi.framework.BundleContext;
69 import org.osgi.framework.FrameworkUtil;
70 import org.slf4j.Logger;
71 import org.slf4j.LoggerFactory;
74 * @file HostTracker.java This class tracks the location of IP Hosts as to which
75 * Switch, Port, VLAN, they are connected to, as well as their MAC
76 * address. This is done dynamically as well as statically. The dynamic
77 * mechanism consists of listening to ARP messages as well sending ARP
78 * requests. Static mechanism consists of Northbound APIs to add or remove
79 * the hosts from the local database. ARP aging is also implemented to age
80 * out dynamically learned hosts. Interface methods are provided for other
81 * applications to 1. Query the local database for a single host 2. Get a
82 * list of all hosts 3. Get notification if a host is learned/added or
83 * removed the database
86 public class HostTracker implements IfIptoHost, IfHostListener, ISwitchManagerAware, IInventoryListener,
87 ITopologyManagerAware, ICacheUpdateAware<InetAddress, HostNodeConnector>, CommandProvider {
88 static final String ACTIVE_HOST_CACHE = "hosttracker.ActiveHosts";
89 static final String INACTIVE_HOST_CACHE = "hosttracker.InactiveHosts";
90 private static final Logger logger = LoggerFactory.getLogger(HostTracker.class);
91 private IHostFinder hostFinder;
92 private ConcurrentMap<InetAddress, HostNodeConnector> hostsDB;
94 * Following is a list of hosts which have been requested by NB APIs to be
95 * added, but either the switch or the port is not sup, so they will be
96 * added here until both come up
98 private ConcurrentMap<NodeConnector, HostNodeConnector> inactiveStaticHosts;
99 private final Set<IfNewHostNotify> newHostNotify = Collections.synchronizedSet(new HashSet<IfNewHostNotify>());
101 private ITopologyManager topologyManager;
102 private IClusterContainerServices clusterContainerService = null;
103 private ISwitchManager switchManager = null;
105 private Timer arpRefreshTimer;
106 private String containerName = null;
107 private ExecutorService executor;
108 private static class ARPPending {
109 protected InetAddress hostIP;
110 protected short sent_count;
111 protected HostTrackerCallable hostTrackerCallable;
113 public InetAddress getHostIP() {
117 public short getSent_count() {
121 public HostTrackerCallable getHostTrackerCallable() {
122 return hostTrackerCallable;
125 public void setHostIP(InetAddress networkAddr) {
126 this.hostIP = networkAddr;
129 public void setSent_count(short count) {
130 this.sent_count = count;
133 public void setHostTrackerCallable(HostTrackerCallable callable) {
134 hostTrackerCallable = callable;
137 // This list contains the hosts for which ARP requests are being sent
139 ConcurrentMap<InetAddress, ARPPending> ARPPendingList;
141 * This list below contains the hosts which were initially in ARPPendingList
142 * above, but ARP response didn't come from there hosts after multiple
143 * attempts over 8 seconds. The assumption is that the response didn't come
144 * back due to one of the following possibilities: 1. The L3 interface
145 * wasn't created for this host in the controller. This would cause
146 * arphandler not to know where to send the ARP 2. The host facing port is
147 * down 3. The IP host doesn't exist or is not responding to ARP requests
149 * Conditions 1 and 2 above can be recovered if ARP is sent when the
150 * relevant L3 interface is added or the port facing host comes up. Whenever
151 * L3 interface is added or host facing port comes up, ARP will be sent to
152 * hosts in this list.
154 * We can't recover from condition 3 above
156 ConcurrentMap<InetAddress, ARPPending> failedARPReqList;
158 public HostTracker() {
161 private void startUp() {
162 nonClusterObjectCreate();
167 timer.schedule(new OutStandingARPHandler(), 4000, 4000);
168 executor = Executors.newFixedThreadPool(2);
169 /* ARP Refresh Timer to go off every 5 seconds to implement ARP aging */
170 arpRefreshTimer = new Timer();
171 arpRefreshTimer.schedule(new ARPRefreshHandler(), 5000, 5000);
172 logger.debug("startUp: Caches created, timers started");
175 @SuppressWarnings("deprecation")
176 private void allocateCache() {
177 if (this.clusterContainerService == null) {
178 logger.error("un-initialized clusterContainerService, can't create cache");
181 logger.debug("Creating Cache for HostTracker");
183 this.clusterContainerService.createCache(ACTIVE_HOST_CACHE,
184 EnumSet.of(IClusterServices.cacheMode.TRANSACTIONAL));
185 this.clusterContainerService.createCache(INACTIVE_HOST_CACHE,
186 EnumSet.of(IClusterServices.cacheMode.TRANSACTIONAL));
187 } catch (CacheConfigException cce) {
188 logger.error("Cache couldn't be created for HostTracker - check cache mode");
189 } catch (CacheExistException cce) {
190 logger.error("Cache for HostTracker already exists, destroy and recreate");
192 logger.debug("Cache successfully created for HostTracker");
195 @SuppressWarnings({ "unchecked", "deprecation" })
196 private void retrieveCache() {
197 if (this.clusterContainerService == null) {
198 logger.error("un-initialized clusterContainerService, can't retrieve cache");
201 logger.debug("Retrieving cache for HostTrackerAH");
202 hostsDB = (ConcurrentMap<InetAddress, HostNodeConnector>) this.clusterContainerService
203 .getCache(ACTIVE_HOST_CACHE);
204 if (hostsDB == null) {
205 logger.error("Cache couldn't be retrieved for HostTracker");
207 logger.debug("Cache was successfully retrieved for HostTracker");
208 logger.debug("Retrieving cache for HostTrackerIH");
209 inactiveStaticHosts = (ConcurrentMap<NodeConnector, HostNodeConnector>) this.clusterContainerService
210 .getCache(INACTIVE_HOST_CACHE);
211 if (inactiveStaticHosts == null) {
212 logger.error("Cache couldn't be retrieved for HostTrackerIH");
214 logger.debug("Cache was successfully retrieved for HostTrackerIH");
217 public void nonClusterObjectCreate() {
218 hostsDB = new ConcurrentHashMap<InetAddress, HostNodeConnector>();
219 inactiveStaticHosts = new ConcurrentHashMap<NodeConnector, HostNodeConnector>();
220 ARPPendingList = new ConcurrentHashMap<InetAddress, ARPPending>();
221 failedARPReqList = new ConcurrentHashMap<InetAddress, ARPPending>();
225 public void shutDown() {
228 public void setnewHostNotify(IfNewHostNotify obj) {
229 this.newHostNotify.add(obj);
232 public void unsetnewHostNotify(IfNewHostNotify obj) {
233 this.newHostNotify.remove(obj);
236 public void setArpHandler(IHostFinder hostFinder) {
237 this.hostFinder = hostFinder;
240 public void unsetArpHandler(IHostFinder hostFinder) {
241 if (this.hostFinder == hostFinder) {
242 logger.debug("Arp Handler Service removed!");
243 this.hostFinder = null;
247 public void setTopologyManager(ITopologyManager s) {
248 this.topologyManager = s;
251 public void unsetTopologyManager(ITopologyManager s) {
252 if (this.topologyManager == s) {
253 logger.debug("Topology Manager Service removed!");
254 this.topologyManager = null;
258 private boolean hostExists(HostNodeConnector host) {
259 HostNodeConnector lhost = hostsDB.get(host.getNetworkAddress());
260 return host.equals(lhost);
263 private HostNodeConnector getHostFromOnActiveDB(InetAddress networkAddress) {
264 return hostsDB.get(networkAddress);
267 private Entry<NodeConnector, HostNodeConnector> getHostFromInactiveDB(InetAddress networkAddress) {
268 for (Entry<NodeConnector, HostNodeConnector> entry : inactiveStaticHosts.entrySet()) {
269 if (entry.getValue().equalsByIP(networkAddress)) {
270 logger.debug("getHostFromInactiveDB(): Inactive Host found for IP:{} ", networkAddress.getHostAddress());
274 logger.debug("getHostFromInactiveDB() Inactive Host Not found for IP: {}", networkAddress.getHostAddress());
278 private void removeHostFromInactiveDB(InetAddress networkAddress) {
279 NodeConnector nodeConnector = null;
280 for (Entry<NodeConnector, HostNodeConnector> entry : inactiveStaticHosts.entrySet()) {
281 if (entry.getValue().equalsByIP(networkAddress)) {
282 nodeConnector = entry.getKey();
286 if (nodeConnector != null) {
287 inactiveStaticHosts.remove(nodeConnector);
288 logger.debug("removeHostFromInactiveDB(): Host Removed for IP: {}", networkAddress.getHostAddress());
291 logger.debug("removeHostFromInactiveDB(): Host Not found for IP: {}", networkAddress.getHostAddress());
294 protected boolean hostMoved(HostNodeConnector host) {
295 if (hostQuery(host.getNetworkAddress()) != null) {
302 public HostNodeConnector hostQuery(InetAddress networkAddress) {
303 return hostsDB.get(networkAddress);
307 public Future<HostNodeConnector> discoverHost(InetAddress networkAddress) {
308 if (executor == null) {
309 logger.error("discoverHost: Null executor");
312 Callable<HostNodeConnector> worker = new HostTrackerCallable(this, networkAddress);
313 Future<HostNodeConnector> submit = executor.submit(worker);
318 public HostNodeConnector hostFind(InetAddress networkAddress) {
320 * Sometimes at boot with containers configured in the startup we hit
321 * this path (from TIF) when hostFinder has not been set yet Caller
322 * already handles the null return
325 if (hostFinder == null) {
326 logger.debug("Exiting hostFind, null hostFinder");
330 HostNodeConnector host = hostQuery(networkAddress);
332 logger.debug("hostFind(): Host found for IP: {}", networkAddress.getHostAddress());
336 /* Add this host to ARPPending List for any potential retries */
338 AddtoARPPendingList(networkAddress);
339 logger.debug("hostFind(): Host Not Found for IP: {}, Inititated Host Discovery ...",
340 networkAddress.getHostAddress());
342 /* host is not found, initiate a discovery */
344 hostFinder.find(networkAddress);
349 public Set<HostNodeConnector> getAllHosts() {
350 Set<HostNodeConnector> allHosts = new HashSet<HostNodeConnector>();
351 for (Entry<InetAddress, HostNodeConnector> entry : hostsDB.entrySet()) {
352 HostNodeConnector host = entry.getValue();
355 logger.debug("Exiting getAllHosts, Found {} Hosts", allHosts.size());
360 public Set<HostNodeConnector> getActiveStaticHosts() {
361 Set<HostNodeConnector> list = new HashSet<HostNodeConnector>();
362 for (Entry<InetAddress, HostNodeConnector> entry : hostsDB.entrySet()) {
363 HostNodeConnector host = entry.getValue();
364 if (host.isStaticHost()) {
368 logger.debug("getActiveStaticHosts(): Found {} Hosts", list.size());
373 public Set<HostNodeConnector> getInactiveStaticHosts() {
374 Set<HostNodeConnector> list = new HashSet<HostNodeConnector>();
375 for (Entry<NodeConnector, HostNodeConnector> entry : inactiveStaticHosts.entrySet()) {
376 list.add(entry.getValue());
378 logger.debug("getInactiveStaticHosts(): Found {} Hosts", list.size());
382 private void AddtoARPPendingList(InetAddress networkAddr) {
383 ARPPending arphost = new ARPPending();
385 arphost.setHostIP(networkAddr);
386 arphost.setSent_count((short) 1);
387 ARPPendingList.put(networkAddr, arphost);
388 logger.debug("Host Added to ARPPending List, IP: {}", networkAddr);
391 public void setCallableOnPendingARP(InetAddress networkAddr, HostTrackerCallable callable) {
393 for (Entry <InetAddress, ARPPending> entry : ARPPendingList.entrySet()) {
394 arphost = entry.getValue();
395 if (arphost.getHostIP().equals(networkAddr)) {
396 arphost.setHostTrackerCallable(callable);
401 private void processPendingARPReqs(InetAddress networkAddr) {
404 if ((arphost = ARPPendingList.remove(networkAddr)) != null) {
405 // Remove the arphost from ARPPendingList as it has been learned now
406 logger.debug("Host Removed from ARPPending List, IP: {}", networkAddr);
407 HostTrackerCallable htCallable = arphost.getHostTrackerCallable();
408 if (htCallable != null)
414 * It could have been a host from the FailedARPReqList
417 if (failedARPReqList.containsKey(networkAddr)) {
418 failedARPReqList.remove(networkAddr);
419 logger.debug("Host Removed from FailedARPReqList List, IP: {}", networkAddr);
424 private void learnNewHost(HostNodeConnector host) {
425 host.initArpSendCountDown();
426 HostNodeConnector rHost = hostsDB.putIfAbsent(host.getNetworkAddress(), host);
428 // Another host is already learned for this IP address, replace it
429 replaceHost(host.getNetworkAddress(), rHost, host);
431 logger.debug("New Host Learned: MAC: {} IP: {}", HexEncode.bytesToHexString(host
432 .getDataLayerAddressBytes()), host.getNetworkAddress().getHostAddress());
436 private void replaceHost(InetAddress networkAddr, HostNodeConnector removedHost, HostNodeConnector newHost) {
437 // Ignore ARP messages from internal nodes
438 NodeConnector newHostNc = newHost.getnodeConnector();
439 boolean newHostIsInternal = topologyManager.isInternal(newHostNc);
440 if (newHostIsInternal) {
444 newHost.initArpSendCountDown();
446 if (hostsDB.replace(networkAddr, removedHost, newHost)) {
447 logger.debug("Host move occurred: Old Host IP:{}, New Host IP: {}", removedHost.getNetworkAddress()
448 .getHostAddress(), newHost.getNetworkAddress().getHostAddress());
449 logger.debug("Old Host MAC: {}, New Host MAC: {}",
450 HexEncode.bytesToHexString(removedHost.getDataLayerAddressBytes()),
451 HexEncode.bytesToHexString(newHost.getDataLayerAddressBytes()));
452 // Display the Old and New HostNodeConnectors also
453 logger.debug("Old {}, New {}", removedHost, newHost);
456 * Host replacement has failed, do the recovery
458 hostsDB.put(networkAddr, newHost);
459 logger.error("Host replacement failed. Overwrite the host. Repalced Host: {}, New Host: {}", removedHost,
462 notifyHostLearnedOrRemoved(removedHost, false);
463 notifyHostLearnedOrRemoved(newHost, true);
464 if (!newHost.isStaticHost()) {
465 processPendingARPReqs(networkAddr);
470 private void removeKnownHost(InetAddress key) {
471 HostNodeConnector host = hostsDB.get(key);
473 logger.debug("Removing Host: IP:{}", host.getNetworkAddress().getHostAddress());
476 logger.error("removeKnownHost(): Host for IP address {} not found in hostsDB", key.getHostAddress());
480 private class NotifyHostThread extends Thread {
482 private final HostNodeConnector host;
484 public NotifyHostThread(HostNodeConnector h) {
490 HostNodeConnector removedHost = null;
491 InetAddress networkAddr = host.getNetworkAddress();
493 /* Check for Host Move case */
494 if (hostMoved(host)) {
496 * Host has been moved from one location (switch,port, MAC, or
497 * VLAN) to another. Replace the existing host and its previous
498 * location parameters with new information, and notify the
499 * applications listening to host move.
501 removedHost = hostsDB.get(networkAddr);
502 if (removedHost != null) {
503 replaceHost(networkAddr, removedHost, host);
506 logger.error("Host to be removed not found in hostsDB. Host {}", removedHost);
510 if (removedHost == null) {
515 /* check if there is an outstanding request for this host */
516 processPendingARPReqs(networkAddr);
517 notifyHostLearnedOrRemoved(host, true);
522 public void hostListener(HostNodeConnector host) {
524 logger.debug("ARP received for Host: IP {}, MAC {}, {}", host.getNetworkAddress().getHostAddress(),
525 HexEncode.bytesToHexString(host.getDataLayerAddressBytes()), host);
526 if (hostExists(host)) {
527 HostNodeConnector existinghost = hostsDB.get(host.getNetworkAddress());
528 existinghost.initArpSendCountDown();
530 hostsDB.put(host.getNetworkAddress(), existinghost);
533 new NotifyHostThread(host).start();
536 // Notify whoever is interested that a new host was learned (dynamically or
538 private void notifyHostLearnedOrRemoved(HostNodeConnector host, boolean add) {
539 // Update listeners if any
540 if (newHostNotify != null) {
541 logger.debug("Notifying Applications for Host {} Being {}", host.getNetworkAddress().getHostAddress(),
542 add ? "Added" : "Deleted");
543 synchronized (this.newHostNotify) {
544 for (IfNewHostNotify ta : newHostNotify) {
547 ta.notifyHTClient(host);
549 ta.notifyHTClientHostRemoved(host);
551 } catch (Exception e) {
552 logger.error("Exception on callback", e);
557 logger.error("notifyHostLearnedOrRemoved(): New host notify is null");
560 // Topology update is for some reason outside of listeners registry
562 Node node = host.getnodeconnectorNode();
564 NodeConnector p = host.getnodeConnector();
566 DataLinkAddress dla = new EthernetAddress(host.getDataLayerAddressBytes());
567 h = new Host(dla, host.getNetworkAddress());
568 } catch (ConstructionException ce) {
573 if (topologyManager != null && p != null && h != null) {
574 logger.debug("Notifying Topology Manager for Host {} Being {}", h.getNetworkAddress().getHostAddress(),
575 add ? "Added" : "Deleted");
577 Tier tier = new Tier(1);
578 switchManager.setNodeProp(node, tier);
579 topologyManager.updateHostLink(p, h, UpdateType.ADDED, null);
581 // No need to reset the tiering if no other hosts are currently
583 // If this switch was discovered to be an access switch, it
584 // still is even if the host is down
585 Tier tier = new Tier(0);
586 switchManager.setNodeProp(node, tier);
587 topologyManager.updateHostLink(p, h, UpdateType.REMOVED, null);
593 * When a new Host is learnt by the hosttracker module, it places the
594 * directly connected Node in Tier-1 & using this function, updates the Tier
595 * value for all other Nodes in the network hierarchy.
597 * This is a recursive function and it takes care of updating the Tier value
598 * for all the connected and eligible Nodes.
601 * Node that represents one of the Vertex in the Topology Graph.
603 * The Tier on which n belongs
605 private void updateSwitchTiers(Node n, int currentTier) {
606 Map<Node, Set<Edge>> ndlinks = topologyManager.getNodeEdges();
607 if (ndlinks == null) {
608 logger.debug("updateSwitchTiers(): ndlinks null for Node: {}, Tier:{}", n, currentTier);
611 Set<Edge> links = ndlinks.get(n);
613 logger.debug("updateSwitchTiers(): links null for ndlinks:{}", ndlinks);
616 ArrayList<Node> needsVisiting = new ArrayList<Node>();
617 for (Edge lt : links) {
618 if (!lt.getHeadNodeConnector().getType().equals(NodeConnector.NodeConnectorIDType.OPENFLOW)) {
619 // We don't want to work on Node that are not openflow
623 Node dstNode = lt.getHeadNodeConnector().getNode();
624 if (switchNeedsTieringUpdate(dstNode, currentTier + 1)) {
625 Tier t = new Tier(currentTier + 1);
626 switchManager.setNodeProp(dstNode, t);
627 needsVisiting.add(dstNode);
632 * Due to the nature of the problem, having a separate loop for nodes
633 * that needs visiting provides a decent walk optimization.
635 for (Node node : needsVisiting) {
636 updateSwitchTiers(node, currentTier + 1);
641 * Internal convenience routine to check the eligibility of a Switch for a
642 * Tier update. Any Node with Tier=0 or a Tier value that is greater than
643 * the new Tier Value is eligible for the update.
646 * Node for which the Tier update eligibility is checked
649 * @return <code>true</code> if the Node is eligible for Tier Update
650 * <code>false</code> otherwise
653 private boolean switchNeedsTieringUpdate(Node n, int tier) {
655 logger.error("switchNeedsTieringUpdate(): Null node for tier: {}", tier);
659 * Node could have gone down
661 if (!switchManager.getNodes().contains(n)) {
664 // This is the case where Tier was never set for this node
665 Tier t = (Tier) switchManager.getNodeProp(n, Tier.TierPropName);
668 if (t.getValue() == 0)
670 else if (t.getValue() > tier)
676 * Internal convenience routine to clear all the Tier values to 0. This
677 * cleanup is performed during cases such as Topology Change where the
678 * existing Tier values might become incorrect
680 private void clearTiers() {
681 Set<Node> nodes = null;
682 if (switchManager == null) {
683 logger.error("clearTiers(): Null switchManager");
686 nodes = switchManager.getNodes();
688 for (Node n : nodes) {
689 Tier t = new Tier(0);
690 switchManager.setNodeProp(n, t);
695 * Internal convenience routine to print the hierarchies of switches.
697 @SuppressWarnings("unused")
698 private void logHierarchies(ArrayList<ArrayList<String>> hierarchies) {
699 String hierarchyString = null;
701 for (ArrayList<String> hierarchy : hierarchies) {
702 StringBuffer buf = new StringBuffer();
703 buf.append("Hierarchy#" + num + " : ");
704 for (String switchName : hierarchy) {
705 buf.append(switchName + "/");
707 logger.debug("{} -> {}", getContainerName(), buf);
713 * getHostNetworkHierarchy is the Back-end routine for the North-Bound API
714 * that returns the Network Hierarchy for a given Host. This API is
715 * typically used by applications like Hadoop for Rack Awareness
719 * IP-Address of the host/node.
720 * @return Network Hierarchies represented by an Array of Array (of
721 * Switch-Ids as String).
724 public List<List<String>> getHostNetworkHierarchy(InetAddress hostAddress) {
725 HostNodeConnector host = hostQuery(hostAddress);
729 List<List<String>> hierarchies = new ArrayList<List<String>>();
730 ArrayList<String> currHierarchy = new ArrayList<String>();
731 hierarchies.add(currHierarchy);
733 Node node = host.getnodeconnectorNode();
734 updateCurrentHierarchy(node, currHierarchy, hierarchies);
739 * dpidToHostNameHack is a hack function for Cisco Live Hadoop Demo. Mininet
740 * is used as the network for Hadoop Demos & in order to give a meaningful
741 * rack-awareness switch names, the DPID is organized in ASCII Characters
742 * and retrieved as string.
746 * @return Ascii String represented by the DPID.
748 private String dpidToHostNameHack(long dpid) {
749 String hex = Long.toHexString(dpid);
751 StringBuffer sb = new StringBuffer();
753 for (int i = 0; i < hex.length(); i++) {
754 result = (int) ((dpid >> (i * 8)) & 0xff);
759 sb.append(String.format("%c", result));
761 return sb.reverse().toString();
765 * A convenient recursive routine to obtain the Hierarchy of Switches.
768 * Current Node in the Recursive routine.
769 * @param currHierarchy
770 * Array of Nodes that make this hierarchy on which the Current
772 * @param fullHierarchy
773 * Array of multiple Hierarchies that represent a given host.
775 @SuppressWarnings("unchecked")
776 private void updateCurrentHierarchy(Node node, ArrayList<String> currHierarchy, List<List<String>> fullHierarchy) {
777 // currHierarchy.add(String.format("%x", currSw.getId()));
778 currHierarchy.add(dpidToHostNameHack((Long) node.getID()));
779 // Shallow copy as required
780 ArrayList<String> currHierarchyClone = (ArrayList<String>) currHierarchy.clone();
782 Map<Node, Set<Edge>> ndlinks = topologyManager.getNodeEdges();
783 if (ndlinks == null) {
784 logger.debug("updateCurrentHierarchy(): topologyManager returned null ndlinks for node: {}", node);
787 Node n = NodeCreator.createOFNode((Long) node.getID());
788 Set<Edge> links = ndlinks.get(n);
790 logger.debug("updateCurrentHierarchy(): Null links for ndlinks");
793 for (Edge lt : links) {
794 if (!lt.getHeadNodeConnector().getType().equals(NodeConnector.NodeConnectorIDType.OPENFLOW)) {
795 // We don't want to work on Node that are not openflow
799 Node dstNode = lt.getHeadNodeConnector().getNode();
801 Tier nodeTier = (Tier) switchManager.getNodeProp(node, Tier.TierPropName);
803 * If the host is directly attached to the src node, then the node
804 * should have been assigned the "Access" tier in
805 * notifyHostLearnedOrRemoved. If not, it would be assigned
806 * "Unknown" tier. Thus the tier of host attached node cannot be
807 * null. If the src node here, is the next node in the hierarchy of
808 * the nodes, then its tier cannot be null
811 Tier dstNodeTier = (Tier) switchManager.getNodeProp(dstNode, Tier.TierPropName);
813 * Skip if the tier of the destination node is null
815 if (dstNodeTier == null) {
818 if (dstNodeTier.getValue() > nodeTier.getValue()) {
819 ArrayList<String> buildHierarchy = currHierarchy;
820 if (currHierarchy.size() > currHierarchyClone.size()) {
821 // Shallow copy as required
822 buildHierarchy = (ArrayList<String>) currHierarchyClone.clone();
823 fullHierarchy.add(buildHierarchy);
825 updateCurrentHierarchy(dstNode, buildHierarchy, fullHierarchy);
830 private void debugEdgeUpdate(Edge e, UpdateType type, Set<Property> props) {
832 Short srcPort = null;
834 Short dstPort = null;
835 boolean added = false;
836 String srcType = null;
837 String dstType = null;
839 if (e == null || type == null) {
840 logger.error("Edge or Update type are null!");
843 srcType = e.getTailNodeConnector().getType();
844 dstType = e.getHeadNodeConnector().getType();
846 if (srcType.equals(NodeConnector.NodeConnectorIDType.PRODUCTION)) {
847 logger.debug("Skip updates for {}", e);
851 if (!srcType.equals(NodeConnector.NodeConnectorIDType.OPENFLOW)) {
852 logger.debug("For now we cannot handle updates for non-openflow nodes");
856 if (dstType.equals(NodeConnector.NodeConnectorIDType.PRODUCTION)) {
857 logger.debug("Skip updates for {}", e);
861 if (!dstType.equals(NodeConnector.NodeConnectorIDType.OPENFLOW)) {
862 logger.debug("For now we cannot handle updates for non-openflow nodes");
866 // At this point we know we got an openflow update, so
867 // lets fill everything accordingly.
868 srcNid = (Long) e.getTailNodeConnector().getNode().getID();
869 srcPort = (Short) e.getTailNodeConnector().getID();
870 dstNid = (Long) e.getHeadNodeConnector().getNode().getID();
871 dstPort = (Short) e.getHeadNodeConnector().getID();
873 // Now lets update the added flag
884 logger.debug("HostTracker Topology linkUpdate handling src:{}[port {}] dst:{}[port {}] added: {}",
885 new Object[] { srcNid, srcPort, dstNid, dstPort, added });
889 public void edgeUpdate(List<TopoEdgeUpdate> topoedgeupdateList) {
890 if (logger.isDebugEnabled()) {
891 for (TopoEdgeUpdate topoEdgeUpdate : topoedgeupdateList) {
892 Edge e = topoEdgeUpdate.getEdge();
893 Set<Property> p = topoEdgeUpdate.getProperty();
894 UpdateType type = topoEdgeUpdate.getUpdateType();
896 debugEdgeUpdate(e, type, p);
902 public void subnetNotify(Subnet sub, boolean add) {
903 logger.debug("Received subnet notification: {} add={}", sub, add);
905 for (Entry <InetAddress, ARPPending> entry : failedARPReqList.entrySet()) {
907 arphost = entry.getValue();
908 if (hostFinder == null) {
909 logger.warn("ARPHandler Services are not available on subnet addition");
912 logger.debug("Sending the ARP from FailedARPReqList fors IP: {}", arphost.getHostIP().getHostAddress());
913 hostFinder.find(arphost.getHostIP());
918 class OutStandingARPHandler extends TimerTask {
923 /* This routine runs every 4 seconds */
924 logger.trace("Number of Entries in ARP Pending/Failed Lists: ARPPendingList = {}, failedARPReqList = {}",
925 ARPPendingList.size(), failedARPReqList.size());
926 for (Entry <InetAddress, ARPPending> entry : ARPPendingList.entrySet()) {
927 arphost = entry.getValue();
929 if (hostsDB.containsKey(arphost.getHostIP())) {
930 // this host is already learned, shouldn't be in ARPPendingList
931 // Remove it and continue
932 logger.warn("Learned Host {} found in ARPPendingList", arphost.getHostIP());
933 ARPPendingList.remove(entry.getKey());
936 if (arphost.getSent_count() < switchManager.getHostRetryCount()) {
938 * No reply has been received of first ARP Req, send the
939 * next one. Before sending the ARP, check if ARPHandler
940 * is available or not
942 if (hostFinder == null) {
943 logger.warn("ARPHandler Services are not available for Outstanding ARPs");
946 hostFinder.find(arphost.getHostIP());
947 arphost.sent_count++;
948 logger.debug("ARP Sent from ARPPending List, IP: {}", arphost.getHostIP().getHostAddress());
949 } else if (arphost.getSent_count() >= switchManager.getHostRetryCount()) {
951 * ARP requests have been sent without receiving a
952 * reply, remove this from the pending list
954 ARPPendingList.remove(entry.getKey());
955 logger.debug("ARP reply not received after multiple attempts, removing from Pending List IP: {}",
956 arphost.getHostIP().getHostAddress());
958 * Add this host to a different list which will be processed
961 logger.debug("Adding the host to FailedARPReqList IP: {}", arphost.getHostIP().getHostAddress());
962 failedARPReqList.put(entry.getKey(), arphost);
965 logger.error("Inavlid arp_sent count for entry: {}", entry);
971 private class ARPRefreshHandler extends TimerTask {
973 @SuppressWarnings("deprecation")
975 if ((clusterContainerService != null) && !clusterContainerService.amICoordinator()) {
978 if ((switchManager != null) && !switchManager.isHostRefreshEnabled()) {
980 * The host probe procedure was disabled by CLI
984 if (hostsDB == null) {
985 /* hostsDB is not allocated yet */
986 logger.error("ARPRefreshHandler(): hostsDB is not allocated yet:");
989 for (Entry<InetAddress, HostNodeConnector> entry : hostsDB.entrySet()) {
990 HostNodeConnector host = entry.getValue();
991 if (host.isStaticHost()) {
992 /* this host was learned via API3, don't age it out */
996 short arp_cntdown = host.getArpSendCountDown();
998 if (arp_cntdown > switchManager.getHostRetryCount()) {
999 host.setArpSendCountDown(arp_cntdown);
1000 } else if (arp_cntdown <= 0) {
1002 * No ARP Reply received in last 2 minutes, remove this host
1003 * and inform applications
1005 removeKnownHost(entry.getKey());
1006 notifyHostLearnedOrRemoved(host, false);
1007 } else if (arp_cntdown <= switchManager.getHostRetryCount()) {
1009 * Use the services of arphandler to check if host is still
1012 if (logger.isTraceEnabled()) {
1014 "ARP Probing ({}) for {}({})",
1015 new Object[] { arp_cntdown, host.getNetworkAddress().getHostAddress(),
1016 HexEncode.bytesToHexString(host.getDataLayerAddressBytes()) });
1018 host.setArpSendCountDown(arp_cntdown);
1019 if (hostFinder == null) {
1021 * If hostfinder is not available, then can't send the
1022 * probe. However, continue the age out the hosts since
1023 * we don't know if the host is indeed out there or not.
1025 logger.warn("ARPHandler is not avaialable, can't send the probe");
1028 hostFinder.probe(host);
1035 * Inform the controller IP to MAC binding of a host and its connectivity to
1036 * an openflow switch in terms of Node, port, and VLAN.
1038 * @param networkAddr
1039 * IP address of the host
1041 * Address MAC address of the host
1043 * NodeConnector to which host is connected
1045 * Port of the switch to which host is connected
1047 * Vlan of which this host is member of
1049 * @return Status The status object as described in {@code Status}
1050 * indicating the result of this action.
1053 public Status addStaticHostReq(InetAddress networkAddr, byte[] dataLayerAddress, NodeConnector nc, short vlan) {
1054 if (dataLayerAddress.length != NetUtils.MACAddrLengthInBytes) {
1055 return new Status(StatusCode.BADREQUEST, "Invalid MAC address");
1059 return new Status(StatusCode.BADREQUEST, "Invalid NodeConnector");
1061 HostNodeConnector host = null;
1063 host = new HostNodeConnector(dataLayerAddress, networkAddr, nc, vlan);
1064 if (hostExists(host)) {
1065 // This host is already learned either via ARP or through a
1066 // northbound request
1067 HostNodeConnector transHost = hostsDB.get(networkAddr);
1068 transHost.setStaticHost(true);
1069 return new Status(StatusCode.SUCCESS, null);
1072 if (hostsDB.get(networkAddr) != null) {
1073 // There is already a host with this IP address (but behind
1074 // a different (switch, port, vlan) tuple. Return an error
1075 return new Status(StatusCode.CONFLICT, "Existing IP, Use PUT to update");
1077 host.setStaticHost(true);
1079 * Check if the nc is an ISL port
1081 if (topologyManager != null) {
1082 if (topologyManager.isInternal(nc)) {
1083 return new Status(StatusCode.BADREQUEST, "Cannot add host on ISL port");
1087 * Before adding host, Check if the switch and the port have already
1090 if (switchManager.isNodeConnectorEnabled(nc)) {
1092 processPendingARPReqs(networkAddr);
1093 notifyHostLearnedOrRemoved(host, true);
1095 inactiveStaticHosts.put(nc, host);
1096 logger.debug("Switch or switchport is not up, adding host {} to inactive list",
1097 networkAddr.getHostName());
1099 return new Status(StatusCode.SUCCESS, null);
1100 } catch (ConstructionException e) {
1101 logger.error("", e);
1102 return new Status(StatusCode.INTERNALERROR, "Host could not be created");
1108 * Update the controller IP to MAC binding of a host and its connectivity to
1109 * an openflow switch in terms of switch id, switch port, and VLAN.
1111 * @param networkAddr
1112 * IP address of the host
1114 * Address MAC address of the host
1116 * NodeConnector to which host is connected
1118 * Port of the switch to which host is connected
1120 * Vlan of which this host is member of
1122 * @return Status The status object as described in {@code Status}
1123 * indicating the result of this action.
1125 public Status updateHostReq(InetAddress networkAddr, byte[] dataLayerAddress, NodeConnector nc, short vlan) {
1126 HostNodeConnector tobeUpdatedHost;
1127 HostNodeConnector host = null;
1129 if (dataLayerAddress.length != NetUtils.MACAddrLengthInBytes) {
1130 return new Status(StatusCode.BADREQUEST, "Invalid MAC address");
1134 return new Status(StatusCode.BADREQUEST, "Invalid NodeConnector");
1138 host = new HostNodeConnector(dataLayerAddress, networkAddr, nc, vlan);
1139 if (hostExists(host)) {
1140 return new Status(StatusCode.BADREQUEST, "Host already exists");
1143 if ((tobeUpdatedHost = hostsDB.get(networkAddr)) != null) {
1144 if (hostsDB.replace(networkAddr, tobeUpdatedHost, host)) {
1145 logger.debug("Host replaced from hostsDB. Old host: {} New Host: {}", tobeUpdatedHost, host);
1146 notifyHostLearnedOrRemoved(tobeUpdatedHost, false);
1147 notifyHostLearnedOrRemoved(host, true);
1148 return new Status(StatusCode.SUCCESS);
1150 logger.error("Static host replacement failed from hostsDB, Replaced Host: {}, New Host: {}",
1151 tobeUpdatedHost, host);
1152 return new Status(StatusCode.INTERNALERROR,
1153 "Host Replacement Failed due to presence of another host with same IP");
1157 // Check if the host exists in inactive hosts database
1158 if ((tobeUpdatedHost = inactiveStaticHosts.get(nc)) != null) {
1159 if (inactiveStaticHosts.replace(nc, tobeUpdatedHost, host)) {
1160 logger.debug("Host replaced from inactive hostsDB. Old host: {} New Host: {}", tobeUpdatedHost,
1162 return new Status(StatusCode.SUCCESS);
1164 logger.error("Static host replacement failed, Replaced Host: {}, New Host: {}", tobeUpdatedHost,
1166 return new Status(StatusCode.INTERNALERROR,
1167 "Host Replacement Failed due to presence of another host with same IP");
1171 // Host doesn't exist
1172 return new Status(StatusCode.BADREQUEST, "Host doesn't exists, can't update");
1173 } catch (ConstructionException e) {
1174 logger.error("", e);
1175 return new Status(StatusCode.INTERNALERROR, "host object creation failure");
1180 * Remove from the controller IP to MAC binding of a host and its
1181 * connectivity to an openflow switch
1183 * @param networkAddr
1184 * IP address of the host
1186 * @return boolean true if the host was removed successfully, false
1190 public Status removeStaticHostReq(InetAddress networkAddress) {
1191 // Check if host is in active hosts database
1192 HostNodeConnector host = getHostFromOnActiveDB(networkAddress);
1195 if (!host.isStaticHost()) {
1196 return new Status(StatusCode.FORBIDDEN, "Host " + networkAddress.getHostName() + " is not static");
1198 // Remove and notify
1199 notifyHostLearnedOrRemoved(host, false);
1200 removeKnownHost(networkAddress);
1201 return new Status(StatusCode.SUCCESS, null);
1204 // Check if host is in inactive hosts database
1205 Entry<NodeConnector, HostNodeConnector> entry = getHostFromInactiveDB(networkAddress);
1206 if (entry != null) {
1207 host = entry.getValue();
1209 if (!host.isStaticHost()) {
1210 return new Status(StatusCode.FORBIDDEN, "Host " + networkAddress.getHostName() + " is not static");
1212 this.removeHostFromInactiveDB(networkAddress);
1213 return new Status(StatusCode.SUCCESS, null);
1216 // Host is neither in active nor inactive hosts database
1217 return new Status(StatusCode.NOTFOUND, "Host does not exist");
1221 public void modeChangeNotify(Node node, boolean proactive) {
1222 logger.debug("Set Switch {} Mode to {}", node.getID(), proactive);
1226 public void notifyNode(Node node, UpdateType type, Map<String, Property> propMap) {
1232 logger.debug("Received removed node {}", node);
1233 for (Entry<InetAddress, HostNodeConnector> entry : hostsDB.entrySet()) {
1234 HostNodeConnector host = entry.getValue();
1235 if (host.getnodeconnectorNode().equals(node)) {
1236 logger.debug("Node: {} is down, remove from Hosts_DB", node);
1237 removeKnownHost(entry.getKey());
1238 notifyHostLearnedOrRemoved(host, false);
1248 public void notifyNodeConnector(NodeConnector nodeConnector, UpdateType type, Map<String, Property> propMap) {
1249 if (nodeConnector == null)
1260 State state = (State) propMap.get(State.StatePropName);
1261 if ((state != null) && (state.getValue() == State.EDGE_UP)) {
1270 handleNodeConnectorStatusUp(nodeConnector);
1272 handleNodeConnectorStatusDown(nodeConnector);
1277 public Status addStaticHost(String networkAddress, String dataLayerAddress, NodeConnector nc, String vlan) {
1279 InetAddress ip = InetAddress.getByName(networkAddress);
1281 return new Status(StatusCode.BADREQUEST, "Invalid NodeId");
1283 return addStaticHostReq(ip, HexEncode.bytesFromHexString(dataLayerAddress), nc, Short.valueOf(vlan));
1284 } catch (UnknownHostException e) {
1285 logger.error("", e);
1286 return new Status(StatusCode.BADREQUEST, "Invalid Address");
1291 public Status removeStaticHost(String networkAddress) {
1292 InetAddress address;
1294 address = InetAddress.getByName(networkAddress);
1295 return removeStaticHostReq(address);
1296 } catch (UnknownHostException e) {
1297 logger.error("", e);
1298 return new Status(StatusCode.BADREQUEST, "Invalid Address");
1302 private void handleNodeConnectorStatusUp(NodeConnector nodeConnector) {
1304 HostNodeConnector host = null;
1306 logger.debug("handleNodeConnectorStatusUp {}", nodeConnector);
1308 for (Entry <InetAddress, ARPPending> entry : failedARPReqList.entrySet()) {
1309 arphost = entry.getValue();
1310 logger.debug("Sending the ARP from FailedARPReqList fors IP: {}", arphost.getHostIP().getHostAddress());
1311 if (hostFinder == null) {
1312 logger.warn("ARPHandler is not available at interface up");
1313 logger.warn("Since this event is missed, host(s) connected to interface {} may not be discovered",
1318 // Send a broadcast ARP only on the interface which just came up.
1319 // Use hostFinder's "probe" method
1321 byte[] dataLayerAddress = NetUtils.getBroadcastMACAddr();
1322 host = new HostNodeConnector(dataLayerAddress, arphost.getHostIP(), nodeConnector, (short) 0);
1323 hostFinder.probe(host);
1324 } catch (ConstructionException e) {
1325 logger.debug("HostNodeConnector couldn't be created for Host: {}, NodeConnector: {}",
1326 arphost.getHostIP(), nodeConnector);
1327 logger.error("", e);
1329 logger.debug("Done. handleNodeConnectorStatusUp {}", nodeConnector);
1332 host = inactiveStaticHosts.get(nodeConnector);
1334 inactiveStaticHosts.remove(nodeConnector);
1336 processPendingARPReqs(host.getNetworkAddress());
1337 notifyHostLearnedOrRemoved(host, true);
1341 private void handleNodeConnectorStatusDown(NodeConnector nodeConnector) {
1342 logger.debug("handleNodeConnectorStatusDown {}", nodeConnector);
1344 for (Entry<InetAddress, HostNodeConnector> entry : hostsDB.entrySet()) {
1345 HostNodeConnector host = entry.getValue();
1346 if (host.getnodeConnector().equals(nodeConnector)) {
1347 logger.debug(" NodeConnector: {} is down, remove from Hosts_DB", nodeConnector);
1348 removeKnownHost(entry.getKey());
1349 notifyHostLearnedOrRemoved(host, false);
1354 void setClusterContainerService(IClusterContainerServices s) {
1355 logger.debug("Cluster Service set");
1356 this.clusterContainerService = s;
1359 void unsetClusterContainerService(IClusterContainerServices s) {
1360 if (this.clusterContainerService == s) {
1361 logger.debug("Cluster Service removed!");
1362 this.clusterContainerService = null;
1366 void setSwitchManager(ISwitchManager s) {
1367 logger.debug("SwitchManager set");
1368 this.switchManager = s;
1371 void unsetSwitchManager(ISwitchManager s) {
1372 if (this.switchManager == s) {
1373 logger.debug("SwitchManager removed!");
1374 this.switchManager = null;
1378 public String getContainerName() {
1379 if (containerName == null)
1380 return GlobalConstants.DEFAULT.toString();
1381 return containerName;
1385 * Function called by the dependency manager when all the required
1386 * dependencies are satisfied
1389 void init(Component c) {
1390 Dictionary<?, ?> props = c.getServiceProperties();
1391 if (props != null) {
1392 this.containerName = (String) props.get("containerName");
1393 logger.debug("Running containerName: {}", this.containerName);
1395 // In the Global instance case the containerName is empty
1396 this.containerName = "";
1402 * Function called by the dependency manager when at least one dependency
1403 * become unsatisfied or when the component is shutting down because for
1404 * example bundle is being stopped.
1411 * Function called by dependency manager after "init ()" is called and after
1412 * the services provided by the class are registered in the service registry
1416 registerWithOSGIConsole();
1420 * Function called by the dependency manager before the services exported by
1421 * the component are unregistered, this will be followed by a "destroy ()"
1429 arpRefreshTimer.cancel();
1431 executor.shutdown();
1435 public void edgeOverUtilized(Edge edge) {
1436 // TODO Auto-generated method stub
1441 public void edgeUtilBackToNormal(Edge edge) {
1442 // TODO Auto-generated method stub
1447 public void entryCreated(InetAddress key, String cacheName,
1448 boolean originLocal) {
1449 if (originLocal) return;
1450 processPendingARPReqs(key);
1454 public void entryUpdated(InetAddress key, HostNodeConnector new_value,
1455 String cacheName, boolean originLocal) {
1459 public void entryDeleted(InetAddress key, String cacheName,
1460 boolean originLocal) {
1463 private void registerWithOSGIConsole() {
1464 BundleContext bundleContext = FrameworkUtil.getBundle(this.getClass()).getBundleContext();
1465 bundleContext.registerService(CommandProvider.class.getName(), this, null);
1469 public String getHelp() {
1470 // TODO Auto-generated method stub
1474 public void _dumpPendingARPReqList(CommandInterpreter ci) {
1476 for (Entry <InetAddress, ARPPending> entry : ARPPendingList.entrySet()) {
1477 arphost = entry.getValue();
1478 ci.println(arphost.getHostIP().toString());
1482 public void _dumpFailedARPReqList(CommandInterpreter ci) {
1484 for (Entry <InetAddress, ARPPending> entry : failedARPReqList.entrySet()) {
1485 arphost = entry.getValue();
1486 ci.println(arphost.getHostIP().toString());