| /* |
| * Copyright 2014 Open Networking Laboratory |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.onlab.onos.sdnip; |
| |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.concurrent.BlockingQueue; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.LinkedBlockingQueue; |
| import java.util.concurrent.Semaphore; |
| |
| import org.apache.commons.lang3.tuple.Pair; |
| import org.onlab.onos.core.ApplicationId; |
| import org.onlab.onos.net.ConnectPoint; |
| import org.onlab.onos.net.Host; |
| import org.onlab.onos.net.flow.DefaultTrafficSelector; |
| import org.onlab.onos.net.flow.DefaultTrafficTreatment; |
| import org.onlab.onos.net.flow.TrafficSelector; |
| import org.onlab.onos.net.flow.TrafficTreatment; |
| import org.onlab.onos.net.flow.criteria.Criteria.IPCriterion; |
| import org.onlab.onos.net.flow.criteria.Criterion; |
| import org.onlab.onos.net.flow.criteria.Criterion.Type; |
| import org.onlab.onos.net.host.HostEvent; |
| import org.onlab.onos.net.host.HostListener; |
| import org.onlab.onos.net.host.HostService; |
| import org.onlab.onos.net.intent.Intent; |
| import org.onlab.onos.net.intent.IntentService; |
| import org.onlab.onos.net.intent.IntentState; |
| import org.onlab.onos.net.intent.MultiPointToSinglePointIntent; |
| import org.onlab.onos.sdnip.config.BgpPeer; |
| import org.onlab.onos.sdnip.config.Interface; |
| import org.onlab.onos.sdnip.config.SdnIpConfigService; |
| import org.onlab.packet.Ethernet; |
| import org.onlab.packet.IpAddress; |
| import org.onlab.packet.IpPrefix; |
| import org.onlab.packet.MacAddress; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.google.common.base.Objects; |
| import com.google.common.collect.HashMultimap; |
| import com.google.common.collect.Multimaps; |
| import com.google.common.collect.SetMultimap; |
| import com.google.common.util.concurrent.ThreadFactoryBuilder; |
| import com.googlecode.concurrenttrees.common.KeyValuePair; |
| import com.googlecode.concurrenttrees.radix.node.concrete.DefaultByteArrayNodeFactory; |
| import com.googlecode.concurrenttrees.radixinverted.ConcurrentInvertedRadixTree; |
| import com.googlecode.concurrenttrees.radixinverted.InvertedRadixTree; |
| |
| /** |
| * This class processes BGP route update, translates each update into a intent |
| * and submits the intent. |
| */ |
| public class Router implements RouteListener { |
| |
| private static final Logger log = LoggerFactory.getLogger(Router.class); |
| |
| // Store all route updates in a radix tree. |
| // The key in this tree is the binary string of prefix of the route. |
| private InvertedRadixTree<RouteEntry> bgpRoutes; |
| |
| // Stores all incoming route updates in a queue. |
| private BlockingQueue<RouteUpdate> routeUpdates; |
| |
| // The IpAddress is the next hop address of each route update. |
| private SetMultimap<IpAddress, RouteEntry> routesWaitingOnArp; |
| private ConcurrentHashMap<IpPrefix, MultiPointToSinglePointIntent> pushedRouteIntents; |
| |
| private IntentService intentService; |
| private HostService hostService; |
| private SdnIpConfigService configService; |
| private InterfaceService interfaceService; |
| |
| private ExecutorService bgpUpdatesExecutor; |
| private ExecutorService bgpIntentsSynchronizerExecutor; |
| |
| private final ApplicationId appId; |
| |
| // |
| // State to deal with SDN-IP Leader election and pushing Intents |
| // |
| private Semaphore intentsSynchronizerSemaphore = new Semaphore(0); |
| private volatile boolean isElectedLeader = false; |
| private volatile boolean isActivatedLeader = false; |
| |
| // For routes announced by local BGP daemon in SDN network, |
| // the next hop will be 0.0.0.0. |
| public static final IpAddress LOCAL_NEXT_HOP = IpAddress.valueOf("0.0.0.0"); |
| |
| /** |
| * Class constructor. |
| * |
| * @param appId the application ID |
| * @param intentService the intent service |
| * @param hostService the host service |
| * @param configService the configuration service |
| * @param interfaceService the interface service |
| */ |
| public Router(ApplicationId appId, IntentService intentService, |
| HostService hostService, SdnIpConfigService configService, |
| InterfaceService interfaceService) { |
| this.appId = appId; |
| this.intentService = intentService; |
| this.hostService = hostService; |
| this.configService = configService; |
| this.interfaceService = interfaceService; |
| |
| bgpRoutes = new ConcurrentInvertedRadixTree<>( |
| new DefaultByteArrayNodeFactory()); |
| routeUpdates = new LinkedBlockingQueue<>(); |
| routesWaitingOnArp = Multimaps.synchronizedSetMultimap( |
| HashMultimap.<IpAddress, RouteEntry>create()); |
| pushedRouteIntents = new ConcurrentHashMap<>(); |
| |
| bgpUpdatesExecutor = Executors.newSingleThreadExecutor( |
| new ThreadFactoryBuilder().setNameFormat("bgp-updates-%d").build()); |
| bgpIntentsSynchronizerExecutor = Executors.newSingleThreadExecutor( |
| new ThreadFactoryBuilder() |
| .setNameFormat("bgp-intents-synchronizer-%d").build()); |
| |
| this.hostService.addListener(new InternalHostListener()); |
| } |
| |
| /** |
| * Starts the router. |
| */ |
| public void start() { |
| bgpUpdatesExecutor.execute(new Runnable() { |
| @Override |
| public void run() { |
| doUpdatesThread(); |
| } |
| }); |
| |
| bgpIntentsSynchronizerExecutor.execute(new Runnable() { |
| @Override |
| public void run() { |
| doIntentSynchronizationThread(); |
| } |
| }); |
| } |
| |
| /** |
| * Shuts the router down. |
| */ |
| public void shutdown() { |
| bgpUpdatesExecutor.shutdownNow(); |
| bgpIntentsSynchronizerExecutor.shutdownNow(); |
| } |
| |
| //@Override TODO hook this up to something |
| public void leaderChanged(boolean isLeader) { |
| log.debug("Leader changed: {}", isLeader); |
| |
| if (!isLeader) { |
| this.isElectedLeader = false; |
| this.isActivatedLeader = false; |
| return; // Nothing to do |
| } |
| this.isActivatedLeader = false; |
| this.isElectedLeader = true; |
| |
| // |
| // Tell the Intents Synchronizer thread to start the synchronization |
| // |
| intentsSynchronizerSemaphore.release(); |
| } |
| |
| @Override |
| public void update(RouteUpdate routeUpdate) { |
| log.debug("Received new route update: {}", routeUpdate); |
| |
| try { |
| routeUpdates.put(routeUpdate); |
| } catch (InterruptedException e) { |
| log.debug("Interrupted while putting on routeUpdates queue", e); |
| Thread.currentThread().interrupt(); |
| } |
| } |
| |
| /** |
| * Thread for Intent Synchronization. |
| */ |
| private void doIntentSynchronizationThread() { |
| boolean interrupted = false; |
| try { |
| while (!interrupted) { |
| try { |
| intentsSynchronizerSemaphore.acquire(); |
| // |
| // Drain all permits, because a single synchronization is |
| // sufficient. |
| // |
| intentsSynchronizerSemaphore.drainPermits(); |
| } catch (InterruptedException e) { |
| log.debug("Interrupted while waiting to become " + |
| "Intent Synchronization leader"); |
| interrupted = true; |
| break; |
| } |
| syncIntents(); |
| } |
| } finally { |
| if (interrupted) { |
| Thread.currentThread().interrupt(); |
| } |
| } |
| } |
| |
| /** |
| * Thread for handling route updates. |
| */ |
| private void doUpdatesThread() { |
| boolean interrupted = false; |
| try { |
| while (!interrupted) { |
| try { |
| RouteUpdate update = routeUpdates.take(); |
| switch (update.type()) { |
| case UPDATE: |
| processRouteAdd(update.routeEntry()); |
| break; |
| case DELETE: |
| processRouteDelete(update.routeEntry()); |
| break; |
| default: |
| log.error("Unknown update Type: {}", update.type()); |
| break; |
| } |
| } catch (InterruptedException e) { |
| log.debug("Interrupted while taking from updates queue", e); |
| interrupted = true; |
| } catch (Exception e) { |
| log.debug("exception", e); |
| } |
| } |
| } finally { |
| if (interrupted) { |
| Thread.currentThread().interrupt(); |
| } |
| } |
| } |
| |
| /** |
| * Performs Intents Synchronization between the internally stored Route |
| * Intents and the installed Route Intents. |
| */ |
| private void syncIntents() { |
| synchronized (this) { |
| if (!isElectedLeader) { |
| return; // Nothing to do: not the leader anymore |
| } |
| log.debug("Syncing SDN-IP Route Intents..."); |
| |
| Map<IpPrefix, MultiPointToSinglePointIntent> fetchedIntents = |
| new HashMap<>(); |
| |
| // |
| // Fetch all intents, and classify the Multi-Point-to-Point Intents |
| // based on the matching prefix. |
| // |
| for (Intent intent : intentService.getIntents()) { |
| |
| if (!(intent instanceof MultiPointToSinglePointIntent) |
| || !intent.appId().equals(appId)) { |
| continue; |
| } |
| MultiPointToSinglePointIntent mp2pIntent = |
| (MultiPointToSinglePointIntent) intent; |
| |
| Criterion c = mp2pIntent.selector().getCriterion(Type.IPV4_DST); |
| if (c != null && c instanceof IPCriterion) { |
| IPCriterion ipCriterion = (IPCriterion) c; |
| fetchedIntents.put(ipCriterion.ip(), mp2pIntent); |
| } else { |
| log.warn("No IPV4_DST criterion found for intent {}", |
| mp2pIntent.id()); |
| } |
| |
| } |
| |
| // |
| // Compare for each prefix the local IN-MEMORY Intents with the |
| // FETCHED Intents: |
| // - If the IN-MEMORY Intent is same as the FETCHED Intent, store |
| // the FETCHED Intent in the local memory (i.e., override the |
| // IN-MEMORY Intent) to preserve the original Intent ID |
| // - if the IN-MEMORY Intent is not same as the FETCHED Intent, |
| // delete the FETCHED Intent, and push/install the IN-MEMORY |
| // Intent. |
| // - If there is an IN-MEMORY Intent for a prefix, but no FETCHED |
| // Intent for same prefix, then push/install the IN-MEMORY |
| // Intent. |
| // - If there is a FETCHED Intent for a prefix, but no IN-MEMORY |
| // Intent for same prefix, then delete/withdraw the FETCHED |
| // Intent. |
| // |
| Collection<Pair<IpPrefix, MultiPointToSinglePointIntent>> |
| storeInMemoryIntents = new LinkedList<>(); |
| Collection<Pair<IpPrefix, MultiPointToSinglePointIntent>> |
| addIntents = new LinkedList<>(); |
| Collection<Pair<IpPrefix, MultiPointToSinglePointIntent>> |
| deleteIntents = new LinkedList<>(); |
| for (Map.Entry<IpPrefix, MultiPointToSinglePointIntent> entry : |
| pushedRouteIntents.entrySet()) { |
| IpPrefix prefix = entry.getKey(); |
| MultiPointToSinglePointIntent inMemoryIntent = |
| entry.getValue(); |
| MultiPointToSinglePointIntent fetchedIntent = |
| fetchedIntents.get(prefix); |
| |
| if (fetchedIntent == null) { |
| // |
| // No FETCHED Intent for same prefix: push the IN-MEMORY |
| // Intent. |
| // |
| addIntents.add(Pair.of(prefix, inMemoryIntent)); |
| continue; |
| } |
| |
| IntentState state = intentService.getIntentState(fetchedIntent.id()); |
| if (state == IntentState.WITHDRAWING || |
| state == IntentState.WITHDRAWN) { |
| // The intent has been withdrawn but according to our route |
| // table it should be installed. We'll reinstall it. |
| addIntents.add(Pair.of(prefix, inMemoryIntent)); |
| } |
| |
| // |
| // If IN-MEMORY Intent is same as the FETCHED Intent, |
| // store the FETCHED Intent in the local memory. |
| // |
| if (compareMultiPointToSinglePointIntents(inMemoryIntent, |
| fetchedIntent)) { |
| storeInMemoryIntents.add(Pair.of(prefix, fetchedIntent)); |
| } else { |
| // |
| // The IN-MEMORY Intent is not same as the FETCHED Intent, |
| // hence delete the FETCHED Intent, and install the |
| // IN-MEMORY Intent. |
| // |
| deleteIntents.add(Pair.of(prefix, fetchedIntent)); |
| addIntents.add(Pair.of(prefix, inMemoryIntent)); |
| } |
| fetchedIntents.remove(prefix); |
| } |
| |
| // |
| // Any remaining FETCHED Intents have to be deleted/withdrawn |
| // |
| for (Map.Entry<IpPrefix, MultiPointToSinglePointIntent> entry : |
| fetchedIntents.entrySet()) { |
| IpPrefix prefix = entry.getKey(); |
| MultiPointToSinglePointIntent fetchedIntent = entry.getValue(); |
| deleteIntents.add(Pair.of(prefix, fetchedIntent)); |
| } |
| |
| // |
| // Perform the actions: |
| // 1. Store in memory fetched intents that are same. Can be done |
| // even if we are not the leader anymore |
| // 2. Delete intents: check if the leader before each operation |
| // 3. Add intents: check if the leader before each operation |
| // |
| for (Pair<IpPrefix, MultiPointToSinglePointIntent> pair : |
| storeInMemoryIntents) { |
| IpPrefix prefix = pair.getLeft(); |
| MultiPointToSinglePointIntent intent = pair.getRight(); |
| log.debug("Intent synchronization: updating in-memory " + |
| "Intent for prefix: {}", prefix); |
| pushedRouteIntents.put(prefix, intent); |
| } |
| // |
| isActivatedLeader = true; // Allow push of Intents |
| for (Pair<IpPrefix, MultiPointToSinglePointIntent> pair : |
| deleteIntents) { |
| IpPrefix prefix = pair.getLeft(); |
| MultiPointToSinglePointIntent intent = pair.getRight(); |
| if (!isElectedLeader) { |
| isActivatedLeader = false; |
| return; |
| } |
| log.debug("Intent synchronization: deleting Intent for " + |
| "prefix: {}", prefix); |
| intentService.withdraw(intent); |
| } |
| // |
| for (Pair<IpPrefix, MultiPointToSinglePointIntent> pair : |
| addIntents) { |
| IpPrefix prefix = pair.getLeft(); |
| MultiPointToSinglePointIntent intent = pair.getRight(); |
| if (!isElectedLeader) { |
| isActivatedLeader = false; |
| return; |
| } |
| log.debug("Intent synchronization: adding Intent for " + |
| "prefix: {}", prefix); |
| intentService.submit(intent); |
| } |
| if (!isElectedLeader) { |
| isActivatedLeader = false; |
| } |
| log.debug("Syncing SDN-IP routes completed."); |
| } |
| } |
| |
| /** |
| * Compares two Multi-point to Single Point Intents whether they represent |
| * same logical intention. |
| * |
| * @param intent1 the first Intent to compare |
| * @param intent2 the second Intent to compare |
| * @return true if both Intents represent same logical intention, otherwise |
| * false |
| */ |
| private boolean compareMultiPointToSinglePointIntents( |
| MultiPointToSinglePointIntent intent1, |
| MultiPointToSinglePointIntent intent2) { |
| |
| return Objects.equal(intent1.appId(), intent2.appId()) && |
| Objects.equal(intent1.selector(), intent2.selector()) && |
| Objects.equal(intent1.treatment(), intent2.treatment()) && |
| Objects.equal(intent1.ingressPoints(), intent2.ingressPoints()) && |
| Objects.equal(intent1.egressPoint(), intent2.egressPoint()); |
| } |
| |
| /** |
| * Processes adding a route entry. |
| * <p> |
| * Put new route entry into the radix tree. If there was an existing |
| * next hop for this prefix, but the next hop was different, then execute |
| * deleting old route entry. If the next hop is the SDN domain, we do not |
| * handle it at the moment. Otherwise, execute adding a route. |
| * </p> |
| * |
| * @param routeEntry the route entry to add |
| */ |
| protected void processRouteAdd(RouteEntry routeEntry) { |
| synchronized (this) { |
| log.debug("Processing route add: {}", routeEntry); |
| |
| IpPrefix prefix = routeEntry.prefix(); |
| IpAddress nextHop = null; |
| RouteEntry foundRouteEntry = |
| bgpRoutes.put(RouteEntry.createBinaryString(prefix), |
| routeEntry); |
| if (foundRouteEntry != null) { |
| nextHop = foundRouteEntry.nextHop(); |
| } |
| |
| if (nextHop != null && !nextHop.equals(routeEntry.nextHop())) { |
| // There was an existing nexthop for this prefix. This update |
| // supersedes that, so we need to remove the old flows for this |
| // prefix from the switches |
| executeRouteDelete(routeEntry); |
| } |
| if (nextHop != null && nextHop.equals(routeEntry.nextHop())) { |
| return; |
| } |
| |
| if (routeEntry.nextHop().equals(LOCAL_NEXT_HOP)) { |
| // Route originated by SDN domain |
| // We don't handle these at the moment |
| log.debug("Own route {} to {}", |
| routeEntry.prefix(), routeEntry.nextHop()); |
| return; |
| } |
| |
| executeRouteAdd(routeEntry); |
| } |
| } |
| |
| /** |
| * Executes adding a route entry. |
| * <p> |
| * Find out the egress Interface and MAC address of next hop router for |
| * this route entry. If the MAC address can not be found in ARP cache, |
| * then this prefix will be put in routesWaitingOnArp queue. Otherwise, |
| * new route intent will be created and installed. |
| * </p> |
| * |
| * @param routeEntry the route entry to add |
| */ |
| private void executeRouteAdd(RouteEntry routeEntry) { |
| log.debug("Executing route add: {}", routeEntry); |
| |
| // Monitor the IP address so we'll get notified of updates to the MAC |
| // address. |
| hostService.startMonitoringIp(routeEntry.nextHop()); |
| |
| // See if we know the MAC address of the next hop |
| MacAddress nextHopMacAddress = null; |
| Set<Host> hosts = hostService.getHostsByIp(routeEntry.nextHop()); |
| if (!hosts.isEmpty()) { |
| // TODO how to handle if multiple hosts are returned? |
| nextHopMacAddress = hosts.iterator().next().mac(); |
| } |
| |
| if (nextHopMacAddress == null) { |
| routesWaitingOnArp.put(routeEntry.nextHop(), routeEntry); |
| return; |
| } |
| |
| addRouteIntentToNextHop(routeEntry.prefix(), |
| routeEntry.nextHop(), |
| nextHopMacAddress); |
| } |
| |
| /** |
| * Adds a route intent given a prefix and a next hop IP address. This |
| * method will find the egress interface for the intent. |
| * |
| * @param prefix IP prefix of the route to add |
| * @param nextHopIpAddress IP address of the next hop |
| * @param nextHopMacAddress MAC address of the next hop |
| */ |
| private void addRouteIntentToNextHop(IpPrefix prefix, |
| IpAddress nextHopIpAddress, |
| MacAddress nextHopMacAddress) { |
| |
| // Find the attachment point (egress interface) of the next hop |
| Interface egressInterface; |
| if (configService.getBgpPeers().containsKey(nextHopIpAddress)) { |
| // Route to a peer |
| log.debug("Route to peer {}", nextHopIpAddress); |
| BgpPeer peer = |
| configService.getBgpPeers().get(nextHopIpAddress); |
| egressInterface = |
| interfaceService.getInterface(peer.connectPoint()); |
| } else { |
| // Route to non-peer |
| log.debug("Route to non-peer {}", nextHopIpAddress); |
| egressInterface = |
| interfaceService.getMatchingInterface(nextHopIpAddress); |
| if (egressInterface == null) { |
| log.warn("No outgoing interface found for {}", |
| nextHopIpAddress); |
| return; |
| } |
| } |
| |
| doAddRouteIntent(prefix, egressInterface, nextHopMacAddress); |
| } |
| |
| /** |
| * Installs a route intent for a prefix. |
| * <p/> |
| * Intent will match dst IP prefix and rewrite dst MAC address at all other |
| * border switches, then forward packets according to dst MAC address. |
| * |
| * @param prefix IP prefix from route |
| * @param egressInterface egress Interface connected to next hop router |
| * @param nextHopMacAddress MAC address of next hop router |
| */ |
| private void doAddRouteIntent(IpPrefix prefix, Interface egressInterface, |
| MacAddress nextHopMacAddress) { |
| log.debug("Adding intent for prefix {}, next hop mac {}", |
| prefix, nextHopMacAddress); |
| |
| MultiPointToSinglePointIntent pushedIntent = |
| pushedRouteIntents.get(prefix); |
| |
| // Just for testing. |
| if (pushedIntent != null) { |
| log.error("There should not be a pushed intent: {}", pushedIntent); |
| } |
| |
| ConnectPoint egressPort = egressInterface.connectPoint(); |
| |
| Set<ConnectPoint> ingressPorts = new HashSet<>(); |
| |
| for (Interface intf : interfaceService.getInterfaces()) { |
| if (!intf.equals(egressInterface)) { |
| ConnectPoint srcPort = intf.connectPoint(); |
| ingressPorts.add(srcPort); |
| } |
| } |
| |
| // Match the destination IP prefix at the first hop |
| TrafficSelector selector = DefaultTrafficSelector.builder() |
| .matchEthType(Ethernet.TYPE_IPV4) |
| .matchIPDst(prefix) |
| .build(); |
| |
| // Rewrite the destination MAC address |
| TrafficTreatment treatment = DefaultTrafficTreatment.builder() |
| .setEthDst(nextHopMacAddress) |
| .build(); |
| |
| MultiPointToSinglePointIntent intent = |
| new MultiPointToSinglePointIntent(appId, selector, treatment, |
| ingressPorts, egressPort); |
| |
| if (isElectedLeader && isActivatedLeader) { |
| log.debug("Intent installation: adding Intent for prefix: {}", |
| prefix); |
| intentService.submit(intent); |
| } |
| |
| // Maintain the Intent |
| pushedRouteIntents.put(prefix, intent); |
| } |
| |
| /** |
| * Executes deleting a route entry. |
| * <p> |
| * Removes prefix from radix tree, and if successful, then try to delete |
| * the related intent. |
| * </p> |
| * |
| * @param routeEntry the route entry to delete |
| */ |
| protected void processRouteDelete(RouteEntry routeEntry) { |
| synchronized (this) { |
| log.debug("Processing route delete: {}", routeEntry); |
| IpPrefix prefix = routeEntry.prefix(); |
| |
| if (bgpRoutes.remove(RouteEntry.createBinaryString(prefix))) { |
| // |
| // Only delete flows if an entry was actually removed from the |
| // tree. If no entry was removed, the <prefix, nexthop> wasn't |
| // there so it's probably already been removed and we don't |
| // need to do anything. |
| // |
| executeRouteDelete(routeEntry); |
| } |
| |
| routesWaitingOnArp.remove(routeEntry.nextHop(), routeEntry); |
| // TODO cancel the request in the ARP manager as well |
| } |
| } |
| |
| /** |
| * Executed deleting a route entry. |
| * |
| * @param routeEntry the route entry to delete |
| */ |
| private void executeRouteDelete(RouteEntry routeEntry) { |
| log.debug("Executing route delete: {}", routeEntry); |
| |
| IpPrefix prefix = routeEntry.prefix(); |
| |
| MultiPointToSinglePointIntent intent = |
| pushedRouteIntents.remove(prefix); |
| |
| if (intent == null) { |
| log.debug("There is no intent in pushedRouteIntents to delete " + |
| "for prefix: {}", prefix); |
| } else { |
| if (isElectedLeader && isActivatedLeader) { |
| log.debug("Intent installation: deleting Intent for prefix: {}", |
| prefix); |
| intentService.withdraw(intent); |
| } |
| } |
| } |
| |
| /** |
| * Signals the Router that the MAC to IP mapping has potentially been |
| * updated. This has the effect of updating the MAC address for any |
| * installed prefixes if it has changed, as well as installing any pending |
| * prefixes that were waiting for MAC resolution. |
| * |
| * @param ipAddress the IP address that an event was received for |
| * @param macAddress the most recently known MAC address for the IP address |
| */ |
| private void updateMac(IpAddress ipAddress, MacAddress macAddress) { |
| log.debug("Received updated MAC info: {} => {}", ipAddress, macAddress); |
| |
| // TODO here we should check whether the next hop for any of our |
| // installed prefixes has changed, not just prefixes pending installation. |
| |
| // We synchronize on this to prevent changes to the radix tree |
| // while we're pushing intents. If the tree changes, the |
| // tree and intents could get out of sync. |
| synchronized (this) { |
| |
| Set<RouteEntry> routesToPush = |
| routesWaitingOnArp.removeAll(ipAddress); |
| |
| for (RouteEntry routeEntry : routesToPush) { |
| // These will always be adds |
| IpPrefix prefix = routeEntry.prefix(); |
| String binaryString = RouteEntry.createBinaryString(prefix); |
| RouteEntry foundRouteEntry = |
| bgpRoutes.getValueForExactKey(binaryString); |
| if (foundRouteEntry != null && |
| foundRouteEntry.nextHop().equals(routeEntry.nextHop())) { |
| // We only push prefix flows if the prefix is still in the |
| // radix tree and the next hop is the same as our |
| // update. |
| // The prefix could have been removed while we were waiting |
| // for the ARP, or the next hop could have changed. |
| addRouteIntentToNextHop(prefix, ipAddress, macAddress); |
| } else { |
| log.debug("{} has been revoked before the MAC was resolved", |
| routeEntry); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Gets the SDN-IP routes. |
| * |
| * @return the SDN-IP routes |
| */ |
| public Collection<RouteEntry> getRoutes() { |
| Iterator<KeyValuePair<RouteEntry>> it = |
| bgpRoutes.getKeyValuePairsForKeysStartingWith("").iterator(); |
| |
| List<RouteEntry> routes = new LinkedList<>(); |
| |
| while (it.hasNext()) { |
| KeyValuePair<RouteEntry> entry = it.next(); |
| routes.add(entry.getValue()); |
| } |
| |
| return routes; |
| } |
| |
| /** |
| * Gets the pushed route intents. |
| * |
| * @return the pushed route intents |
| */ |
| public Collection<MultiPointToSinglePointIntent> getPushedRouteIntents() { |
| List<MultiPointToSinglePointIntent> pushedIntents = new LinkedList<>(); |
| |
| for (Map.Entry<IpPrefix, MultiPointToSinglePointIntent> entry : |
| pushedRouteIntents.entrySet()) { |
| pushedIntents.add(entry.getValue()); |
| } |
| return pushedIntents; |
| } |
| |
| /** |
| * Listener for host events. |
| */ |
| class InternalHostListener implements HostListener { |
| @Override |
| public void event(HostEvent event) { |
| if (event.type() == HostEvent.Type.HOST_ADDED || |
| event.type() == HostEvent.Type.HOST_UPDATED) { |
| Host host = event.subject(); |
| for (IpAddress ip : host.ipAddresses()) { |
| updateMac(ip, host.mac()); |
| } |
| } |
| } |
| } |
| } |