| /* |
| * Copyright 2016 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.net.intent.impl.compiler; |
| |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Optional; |
| import java.util.Set; |
| import java.util.stream.Collectors; |
| import java.util.stream.Stream; |
| |
| import org.onlab.packet.VlanId; |
| import org.onosproject.net.ConnectPoint; |
| import org.onosproject.net.DeviceId; |
| import org.onosproject.net.Link; |
| import org.onosproject.net.LinkKey; |
| 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.flow.criteria.Criterion; |
| import org.onosproject.net.flow.criteria.VlanIdCriterion; |
| import org.onosproject.net.flow.instructions.L2ModificationInstruction; |
| import org.onosproject.net.intent.PathIntent; |
| import org.onosproject.net.intent.constraint.EncapsulationConstraint; |
| import org.onosproject.net.intent.impl.IntentCompilationException; |
| import org.onosproject.net.newresource.Resource; |
| import org.onosproject.net.newresource.ResourceService; |
| import org.onosproject.net.newresource.Resources; |
| import org.slf4j.Logger; |
| |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.collect.Sets; |
| |
| import static org.onosproject.net.LinkKey.linkKey; |
| |
| /** |
| * Shared APIs and implementations for path compilers. |
| */ |
| |
| public class PathCompiler<T> { |
| |
| /** |
| * Defines methods used to create objects representing flows. |
| */ |
| public interface PathCompilerCreateFlow<T> { |
| |
| void createFlow(TrafficSelector originalSelector, |
| TrafficTreatment originalTreatment, |
| ConnectPoint ingress, ConnectPoint egress, |
| int priority, |
| boolean applyTreatment, |
| List<T> flows, |
| List<DeviceId> devices); |
| |
| Logger log(); |
| |
| ResourceService resourceService(); |
| } |
| |
| private boolean isLast(List<Link> links, int i) { |
| return i == links.size() - 2; |
| } |
| |
| private Map<LinkKey, VlanId> assignVlanId(PathCompilerCreateFlow creator, PathIntent intent) { |
| Set<LinkKey> linkRequest = |
| Sets.newHashSetWithExpectedSize(intent.path() |
| .links().size() - 2); |
| for (int i = 1; i <= intent.path().links().size() - 2; i++) { |
| LinkKey link = linkKey(intent.path().links().get(i)); |
| linkRequest.add(link); |
| // add the inverse link. I want that the VLANID is reserved both for |
| // the direct and inverse link |
| linkRequest.add(linkKey(link.dst(), link.src())); |
| } |
| |
| Map<LinkKey, VlanId> vlanIds = findVlanIds(creator, linkRequest); |
| if (vlanIds.isEmpty()) { |
| creator.log().warn("No VLAN IDs available"); |
| return Collections.emptyMap(); |
| } |
| |
| //same VLANID is used for both directions |
| Set<Resource> resources = vlanIds.entrySet().stream() |
| .flatMap(x -> Stream.of( |
| Resources.discrete(x.getKey().src().deviceId(), x.getKey().src().port(), x.getValue()) |
| .resource(), |
| Resources.discrete(x.getKey().dst().deviceId(), x.getKey().dst().port(), x.getValue()) |
| .resource() |
| )) |
| .collect(Collectors.toSet()); |
| List<org.onosproject.net.newresource.ResourceAllocation> allocations = |
| creator.resourceService().allocate(intent.id(), ImmutableList.copyOf(resources)); |
| if (allocations.isEmpty()) { |
| Collections.emptyMap(); |
| } |
| |
| return vlanIds; |
| } |
| |
| private Map<LinkKey, VlanId> findVlanIds(PathCompilerCreateFlow creator, Set<LinkKey> links) { |
| Map<LinkKey, VlanId> vlanIds = new HashMap<>(); |
| for (LinkKey link : links) { |
| Set<VlanId> forward = findVlanId(creator, link.src()); |
| Set<VlanId> backward = findVlanId(creator, link.dst()); |
| Set<VlanId> common = Sets.intersection(forward, backward); |
| if (common.isEmpty()) { |
| continue; |
| } |
| vlanIds.put(link, common.iterator().next()); |
| } |
| return vlanIds; |
| } |
| |
| private Set<VlanId> findVlanId(PathCompilerCreateFlow creator, ConnectPoint cp) { |
| return creator.resourceService().getAvailableResourceValues( |
| Resources.discrete(cp.deviceId(), cp.port()).id(), |
| VlanId.class); |
| } |
| |
| private void manageVlanEncap(PathCompilerCreateFlow<T> creator, List<T> flows, |
| List<DeviceId> devices, |
| PathIntent intent) { |
| Map<LinkKey, VlanId> vlanIds = assignVlanId(creator, intent); |
| |
| Iterator<Link> links = intent.path().links().iterator(); |
| Link srcLink = links.next(); |
| |
| Link link = links.next(); |
| |
| // Ingress traffic |
| VlanId vlanId = vlanIds.get(linkKey(link)); |
| if (vlanId == null) { |
| throw new IntentCompilationException("No available VLAN ID for " + link); |
| } |
| VlanId prevVlanId = vlanId; |
| |
| Optional<VlanIdCriterion> vlanCriterion = intent.selector().criteria() |
| .stream().filter(criterion -> criterion.type() == Criterion.Type.VLAN_VID) |
| .map(criterion -> (VlanIdCriterion) criterion) |
| .findAny(); |
| |
| //Push VLAN if selector does not include VLAN |
| TrafficTreatment.Builder treatBuilder = DefaultTrafficTreatment.builder(); |
| if (!vlanCriterion.isPresent()) { |
| treatBuilder.pushVlan(); |
| } |
| //Tag the traffic with the new encapsulation VLAN |
| treatBuilder.setVlanId(vlanId); |
| creator.createFlow(intent.selector(), treatBuilder.build(), |
| srcLink.dst(), link.src(), intent.priority(), true, |
| flows, devices); |
| |
| ConnectPoint prev = link.dst(); |
| |
| while (links.hasNext()) { |
| |
| link = links.next(); |
| |
| if (links.hasNext()) { |
| // Transit traffic |
| VlanId egressVlanId = vlanIds.get(linkKey(link)); |
| if (egressVlanId == null) { |
| throw new IntentCompilationException("No available VLAN ID for " + link); |
| } |
| prevVlanId = egressVlanId; |
| |
| TrafficSelector transitSelector = DefaultTrafficSelector.builder() |
| .matchInPort(prev.port()) |
| .matchVlanId(prevVlanId).build(); |
| |
| TrafficTreatment.Builder transitTreat = DefaultTrafficTreatment.builder(); |
| |
| // Set the new vlanId only if the previous one is different |
| if (!prevVlanId.equals(egressVlanId)) { |
| transitTreat.setVlanId(egressVlanId); |
| } |
| creator.createFlow(transitSelector, |
| transitTreat.build(), prev, link.src(), |
| intent.priority(), true, flows, devices); |
| prev = link.dst(); |
| } else { |
| // Egress traffic |
| TrafficSelector egressSelector = DefaultTrafficSelector.builder() |
| .matchInPort(prev.port()) |
| .matchVlanId(prevVlanId).build(); |
| TrafficTreatment.Builder egressTreat = DefaultTrafficTreatment.builder(intent.treatment()); |
| |
| Optional<L2ModificationInstruction.ModVlanIdInstruction> modVlanIdInstruction = intent.treatment() |
| .allInstructions().stream().filter( |
| instruction -> instruction instanceof L2ModificationInstruction.ModVlanIdInstruction) |
| .map(x -> (L2ModificationInstruction.ModVlanIdInstruction) x).findAny(); |
| |
| Optional<L2ModificationInstruction.PopVlanInstruction> popVlanInstruction = intent.treatment() |
| .allInstructions().stream().filter( |
| instruction -> instruction instanceof L2ModificationInstruction.PopVlanInstruction) |
| .map(x -> (L2ModificationInstruction.PopVlanInstruction) x).findAny(); |
| |
| if (!modVlanIdInstruction.isPresent() && !popVlanInstruction.isPresent()) { |
| if (vlanCriterion.isPresent()) { |
| egressTreat.setVlanId(vlanCriterion.get().vlanId()); |
| } else { |
| egressTreat.popVlan(); |
| } |
| } |
| |
| creator.createFlow(egressSelector, |
| egressTreat.build(), prev, link.src(), |
| intent.priority(), true, flows, devices); |
| } |
| } |
| } |
| |
| /** |
| * Compiles an intent down to flows. |
| * |
| * @param creator how to create the flows |
| * @param intent intent to process |
| * @param flows list of generated flows |
| * @param devices list of devices that correspond to the flows |
| */ |
| public void compile(PathCompilerCreateFlow<T> creator, |
| PathIntent intent, |
| List<T> flows, |
| List<DeviceId> devices) { |
| // Note: right now recompile is not considered |
| // TODO: implement recompile behavior |
| |
| List<Link> links = intent.path().links(); |
| |
| Optional<EncapsulationConstraint> encapConstraint = intent.constraints().stream() |
| .filter(constraint -> constraint instanceof EncapsulationConstraint) |
| .map(x -> (EncapsulationConstraint) x).findAny(); |
| //if no encapsulation or is involved only a single switch use the default behaviour |
| if (!encapConstraint.isPresent() || links.size() == 1) { |
| for (int i = 0; i < links.size() - 1; i++) { |
| ConnectPoint ingress = links.get(i).dst(); |
| ConnectPoint egress = links.get(i + 1).src(); |
| creator.createFlow(intent.selector(), intent.treatment(), |
| ingress, egress, intent.priority(), |
| isLast(links, i), flows, devices); |
| } |
| } |
| |
| encapConstraint.map(EncapsulationConstraint::encapType) |
| .map(type -> { |
| switch (type) { |
| case VLAN: |
| manageVlanEncap(creator, flows, devices, intent); |
| // TODO: implement MPLS case here |
| default: |
| // Nothing to do |
| } |
| return 0; |
| }); |
| } |
| |
| } |