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/*
* 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.onosproject.mobility;
import static org.slf4j.LoggerFactory.getLogger;
import java.util.Collection;
import java.util.List;
import org.apache.felix.scr.annotations.Activate;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Deactivate;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.ReferenceCardinality;
import org.onosproject.core.ApplicationId;
import org.onosproject.core.CoreService;
import org.onosproject.net.Device;
import org.onosproject.net.Host;
import org.onosproject.net.device.DeviceService;
import org.onosproject.net.flow.FlowRule;
import org.onosproject.net.flow.FlowRuleService;
import org.onosproject.net.flow.criteria.EthCriterion;
import org.onosproject.net.flow.criteria.Criterion;
import org.onosproject.net.flow.criteria.Criterion.Type;
import org.onosproject.net.host.HostEvent;
import org.onosproject.net.host.HostListener;
import org.onosproject.net.host.HostService;
import org.onlab.packet.MacAddress;
import org.slf4j.Logger;
import com.google.common.collect.Lists;
/**
* Sample mobility application. Cleans up flowmods when a host moves.
*/
@Component(immediate = true)
public class HostMobility {
private final Logger log = getLogger(getClass());
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected HostService hostService;
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected FlowRuleService flowRuleService;
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected DeviceService deviceService;
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected CoreService coreService;
private ApplicationId appId;
@Activate
public void activate() {
appId = coreService.registerApplication("org.onosproject.mobility");
hostService.addListener(new InternalHostListener());
log.info("Started with Application ID {}", appId.id());
}
@Deactivate
public void deactivate() {
flowRuleService.removeFlowRulesById(appId);
log.info("Stopped");
}
public class InternalHostListener
implements HostListener {
@Override
public void event(HostEvent event) {
switch (event.type()) {
case HOST_ADDED:
case HOST_REMOVED:
case HOST_UPDATED:
// don't care if a host has been added, removed.
break;
case HOST_MOVED:
log.info("Host {} has moved; cleaning up.", event.subject());
cleanup(event.subject());
break;
default:
break;
}
}
/**
* For a given host, remove any flow rule which references it's addresses.
* @param host the host to clean up for
*/
private void cleanup(Host host) {
Iterable<Device> devices = deviceService.getDevices();
List<FlowRule> flowRules = Lists.newLinkedList();
for (Device device : devices) {
flowRules.addAll(cleanupDevice(device, host));
}
FlowRule[] flows = new FlowRule[flowRules.size()];
flows = flowRules.toArray(flows);
flowRuleService.removeFlowRules(flows);
}
private Collection<? extends FlowRule> cleanupDevice(Device device, Host host) {
List<FlowRule> flowRules = Lists.newLinkedList();
MacAddress mac = host.mac();
for (FlowRule rule : flowRuleService.getFlowEntries(device.id())) {
for (Criterion c : rule.selector().criteria()) {
if (c.type() == Type.ETH_DST || c.type() == Type.ETH_SRC) {
EthCriterion eth = (EthCriterion) c;
if (eth.mac().equals(mac)) {
flowRules.add(rule);
}
}
}
}
return flowRules;
}
}
}
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