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Diffstat (limited to 'framework/src/onos/apps/sdnip/src/main/java/org/onosproject/sdnip/SdnIpFib.java')
| -rw-r--r-- | framework/src/onos/apps/sdnip/src/main/java/org/onosproject/sdnip/SdnIpFib.java | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/framework/src/onos/apps/sdnip/src/main/java/org/onosproject/sdnip/SdnIpFib.java b/framework/src/onos/apps/sdnip/src/main/java/org/onosproject/sdnip/SdnIpFib.java new file mode 100644 index 00000000..c0001bdc --- /dev/null +++ b/framework/src/onos/apps/sdnip/src/main/java/org/onosproject/sdnip/SdnIpFib.java @@ -0,0 +1,216 @@ +/* + * Copyright 2015 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.onosproject.sdnip; + +import com.google.common.collect.ImmutableList; +import org.onlab.packet.Ethernet; +import org.onlab.packet.IpAddress; +import org.onlab.packet.IpPrefix; +import org.onlab.packet.MacAddress; +import org.onlab.packet.VlanId; +import org.onosproject.core.ApplicationId; +import org.onosproject.incubator.net.intf.Interface; +import org.onosproject.incubator.net.intf.InterfaceService; +import org.onosproject.net.ConnectPoint; +import org.onosproject.net.flow.DefaultTrafficSelector; +import org.onosproject.net.flow.DefaultTrafficTreatment; +import org.onosproject.net.flow.TrafficSelector; +import org.onosproject.net.flow.TrafficTreatment; +import org.onosproject.net.intent.Constraint; +import org.onosproject.net.intent.Key; +import org.onosproject.net.intent.MultiPointToSinglePointIntent; +import org.onosproject.net.intent.constraint.PartialFailureConstraint; +import org.onosproject.routing.FibListener; +import org.onosproject.routing.FibUpdate; +import org.onosproject.routing.IntentSynchronizationService; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.util.Collection; +import java.util.HashSet; +import java.util.Map; +import java.util.Set; +import java.util.concurrent.ConcurrentHashMap; + +import static com.google.common.base.Preconditions.checkArgument; + +/** + * FIB component of SDN-IP. + */ +public class SdnIpFib implements FibListener { + private Logger log = LoggerFactory.getLogger(getClass()); + + private static final int PRIORITY_OFFSET = 100; + private static final int PRIORITY_MULTIPLIER = 5; + protected static final ImmutableList<Constraint> CONSTRAINTS + = ImmutableList.of(new PartialFailureConstraint()); + + private final Map<IpPrefix, MultiPointToSinglePointIntent> routeIntents; + + private final ApplicationId appId; + private final InterfaceService interfaceService; + private final IntentSynchronizationService intentSynchronizer; + + /** + * Class constructor. + * + * @param appId application ID to use when generating intents + * @param interfaceService interface service + * @param intentSynchronizer intent synchronizer + */ + public SdnIpFib(ApplicationId appId, InterfaceService interfaceService, + IntentSynchronizationService intentSynchronizer) { + routeIntents = new ConcurrentHashMap<>(); + + this.appId = appId; + this.interfaceService = interfaceService; + this.intentSynchronizer = intentSynchronizer; + } + + + @Override + public void update(Collection<FibUpdate> updates, Collection<FibUpdate> withdraws) { + int submitCount = 0, withdrawCount = 0; + // + // NOTE: Semantically, we MUST withdraw existing intents before + // submitting new intents. + // + synchronized (this) { + MultiPointToSinglePointIntent intent; + + // + // Prepare the Intent batch operations for the intents to withdraw + // + for (FibUpdate withdraw : withdraws) { + checkArgument(withdraw.type() == FibUpdate.Type.DELETE, + "FibUpdate with wrong type in withdraws list"); + + IpPrefix prefix = withdraw.entry().prefix(); + intent = routeIntents.remove(prefix); + if (intent == null) { + log.trace("SDN-IP No intent in routeIntents to delete " + + "for prefix: {}", prefix); + continue; + } + intentSynchronizer.withdraw(intent); + withdrawCount++; + } + + // + // Prepare the Intent batch operations for the intents to submit + // + for (FibUpdate update : updates) { + checkArgument(update.type() == FibUpdate.Type.UPDATE, + "FibUpdate with wrong type in updates list"); + + IpPrefix prefix = update.entry().prefix(); + intent = generateRouteIntent(prefix, update.entry().nextHopIp(), + update.entry().nextHopMac()); + + if (intent == null) { + // This preserves the old semantics - if an intent can't be + // generated, we don't do anything with that prefix. But + // perhaps we should withdraw the old intent anyway? + continue; + } + + routeIntents.put(prefix, intent); + intentSynchronizer.submit(intent); + submitCount++; + } + + log.debug("SDN-IP submitted {}/{}, withdrew = {}/{}", submitCount, + updates.size(), withdrawCount, withdraws.size()); + } + } + + /** + * Generates a route intent for a prefix, the next hop IP address, and + * the next hop MAC address. + * <p/> + * This method will find the egress interface for the intent. + * 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 of the route to add + * @param nextHopIpAddress IP address of the next hop + * @param nextHopMacAddress MAC address of the next hop + * @return the generated intent, or null if no intent should be submitted + */ + private MultiPointToSinglePointIntent generateRouteIntent( + IpPrefix prefix, + IpAddress nextHopIpAddress, + MacAddress nextHopMacAddress) { + + // Find the attachment point (egress interface) of the next hop + Interface egressInterface = interfaceService.getMatchingInterface(nextHopIpAddress); + if (egressInterface == null) { + log.warn("No outgoing interface found for {}", + nextHopIpAddress); + return null; + } + + // Generate the intent itself + Set<ConnectPoint> ingressPorts = new HashSet<>(); + ConnectPoint egressPort = egressInterface.connectPoint(); + log.debug("Generating intent for prefix {}, next hop mac {}", + prefix, nextHopMacAddress); + + for (Interface intf : interfaceService.getInterfaces()) { + // TODO this should be only peering interfaces + if (!intf.connectPoint().equals(egressInterface.connectPoint())) { + ConnectPoint srcPort = intf.connectPoint(); + ingressPorts.add(srcPort); + } + } + + // Match the destination IP prefix at the first hop + TrafficSelector.Builder selector = DefaultTrafficSelector.builder(); + if (prefix.isIp4()) { + selector.matchEthType(Ethernet.TYPE_IPV4); + selector.matchIPDst(prefix); + } else { + selector.matchEthType(Ethernet.TYPE_IPV6); + selector.matchIPv6Dst(prefix); + } + + // Rewrite the destination MAC address + TrafficTreatment.Builder treatment = DefaultTrafficTreatment.builder() + .setEthDst(nextHopMacAddress); + if (!egressInterface.vlan().equals(VlanId.NONE)) { + treatment.setVlanId(egressInterface.vlan()); + // If we set VLAN ID, we have to make sure a VLAN tag exists. + // TODO support no VLAN -> VLAN routing + selector.matchVlanId(VlanId.ANY); + } + + int priority = + prefix.prefixLength() * PRIORITY_MULTIPLIER + PRIORITY_OFFSET; + Key key = Key.of(prefix.toString(), appId); + return MultiPointToSinglePointIntent.builder() + .appId(appId) + .key(key) + .selector(selector.build()) + .treatment(treatment.build()) + .ingressPoints(ingressPorts) + .egressPoint(egressPort) + .priority(priority) + .constraints(CONSTRAINTS) + .build(); + } + +} |