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/*
* 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.segmentrouting;
import org.onlab.packet.Ethernet;
import org.onlab.packet.IpPrefix;
import org.onlab.packet.TpPort;
import org.onosproject.cli.net.IpProtocol;
import org.onosproject.core.ApplicationId;
import org.onosproject.net.DeviceId;
import org.onosproject.net.flow.DefaultTrafficSelector;
import org.onosproject.net.flow.TrafficSelector;
import org.onosproject.net.flowobjective.DefaultForwardingObjective;
import org.onosproject.net.flowobjective.FlowObjectiveService;
import org.onosproject.net.flowobjective.ForwardingObjective;
import org.onosproject.segmentrouting.config.DeviceConfiguration;
import org.onosproject.store.service.EventuallyConsistentMap;
import org.slf4j.Logger;
import java.util.List;
import java.util.stream.Collectors;
import static org.slf4j.LoggerFactory.getLogger;
/**
* Segment Routing Policy Handler.
*/
public class PolicyHandler {
protected final Logger log = getLogger(getClass());
private ApplicationId appId;
private DeviceConfiguration deviceConfiguration;
private FlowObjectiveService flowObjectiveService;
private TunnelHandler tunnelHandler;
private final EventuallyConsistentMap<String, Policy> policyStore;
public enum Result {
SUCCESS,
POLICY_EXISTS,
ID_EXISTS,
TUNNEL_NOT_FOUND,
POLICY_NOT_FOUND,
UNSUPPORTED_TYPE
}
/**
* Creates a reference.
*
* @param appId segment routing application ID
* @param deviceConfiguration DeviceConfiguration reference
* @param flowObjectiveService FlowObjectiveService reference
* @param tunnelHandler tunnel handler reference
* @param policyStore policy store
*/
public PolicyHandler(ApplicationId appId,
DeviceConfiguration deviceConfiguration,
FlowObjectiveService flowObjectiveService,
TunnelHandler tunnelHandler,
EventuallyConsistentMap<String, Policy> policyStore) {
this.appId = appId;
this.deviceConfiguration = deviceConfiguration;
this.flowObjectiveService = flowObjectiveService;
this.tunnelHandler = tunnelHandler;
this.policyStore = policyStore;
}
/**
* Returns the policies.
*
* @return policy list
*/
public List<Policy> getPolicies() {
return policyStore.values()
.stream()
.filter(policy -> policy instanceof TunnelPolicy)
.map(policy -> new TunnelPolicy((TunnelPolicy) policy))
.collect(Collectors.toList());
}
/**
* Creates a policy using the policy information given.
* @param policy policy reference to create
* @return ID_EXISTS if the same policy ID exists,
* POLICY_EXISTS if the same policy exists, TUNNEL_NOT_FOUND if the tunnel
* does not exists, UNSUPPORTED_TYPE if the policy type is not supported,
* SUCCESS if the policy is created successfully
*/
public Result createPolicy(Policy policy) {
if (policyStore.containsKey(policy.id())) {
log.warn("The policy id {} exists already", policy.id());
return Result.ID_EXISTS;
}
if (policyStore.containsValue(policy)) {
log.warn("The same policy exists already");
return Result.POLICY_EXISTS;
}
if (policy.type() == Policy.Type.TUNNEL_FLOW) {
TunnelPolicy tunnelPolicy = (TunnelPolicy) policy;
Tunnel tunnel = tunnelHandler.getTunnel(tunnelPolicy.tunnelId());
if (tunnel == null) {
return Result.TUNNEL_NOT_FOUND;
}
ForwardingObjective.Builder fwdBuilder = DefaultForwardingObjective
.builder()
.fromApp(appId)
.makePermanent()
.nextStep(tunnel.groupId())
.withPriority(tunnelPolicy.priority())
.withSelector(buildSelector(policy))
.withFlag(ForwardingObjective.Flag.VERSATILE);
DeviceId source = deviceConfiguration.getDeviceId(tunnel.labelIds().get(0));
flowObjectiveService.forward(source, fwdBuilder.add());
} else {
log.warn("Policy type {} is not supported yet.", policy.type());
return Result.UNSUPPORTED_TYPE;
}
policyStore.put(policy.id(), policy);
return Result.SUCCESS;
}
/**
* Removes the policy given.
*
* @param policyInfo policy information to remove
* @return POLICY_NOT_FOUND if the policy to remove does not exists,
* SUCCESS if it is removed successfully
*/
public Result removePolicy(Policy policyInfo) {
if (policyStore.get(policyInfo.id()) != null) {
Policy policy = policyStore.get(policyInfo.id());
if (policy.type() == Policy.Type.TUNNEL_FLOW) {
TunnelPolicy tunnelPolicy = (TunnelPolicy) policy;
Tunnel tunnel = tunnelHandler.getTunnel(tunnelPolicy.tunnelId());
ForwardingObjective.Builder fwdBuilder = DefaultForwardingObjective
.builder()
.fromApp(appId)
.makePermanent()
.withSelector(buildSelector(policy))
.withPriority(tunnelPolicy.priority())
.nextStep(tunnel.groupId())
.withFlag(ForwardingObjective.Flag.VERSATILE);
DeviceId source = deviceConfiguration.getDeviceId(tunnel.labelIds().get(0));
flowObjectiveService.forward(source, fwdBuilder.remove());
policyStore.remove(policyInfo.id());
}
} else {
log.warn("Policy {} was not found", policyInfo.id());
return Result.POLICY_NOT_FOUND;
}
return Result.SUCCESS;
}
private TrafficSelector buildSelector(Policy policy) {
TrafficSelector.Builder tsb = DefaultTrafficSelector.builder();
tsb.matchEthType(Ethernet.TYPE_IPV4);
if (policy.dstIp() != null && !policy.dstIp().isEmpty()) {
tsb.matchIPDst(IpPrefix.valueOf(policy.dstIp()));
}
if (policy.srcIp() != null && !policy.srcIp().isEmpty()) {
tsb.matchIPSrc(IpPrefix.valueOf(policy.srcIp()));
}
if (policy.ipProto() != null && !policy.ipProto().isEmpty()) {
Short ipProto = IpProtocol.valueOf(policy.ipProto()).value();
tsb.matchIPProtocol(ipProto.byteValue());
if (IpProtocol.valueOf(policy.ipProto()).equals(IpProtocol.TCP)) {
if (policy.srcPort() != 0) {
tsb.matchTcpSrc(TpPort.tpPort(policy.srcPort()));
}
if (policy.dstPort() != 0) {
tsb.matchTcpDst(TpPort.tpPort(policy.dstPort()));
}
} else if (IpProtocol.valueOf(policy.ipProto()).equals(IpProtocol.UDP)) {
if (policy.srcPort() != 0) {
tsb.matchUdpSrc(TpPort.tpPort(policy.srcPort()));
}
if (policy.dstPort() != 0) {
tsb.matchUdpDst(TpPort.tpPort(policy.dstPort()));
}
}
}
return tsb.build();
}
}
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